Different Definitions Of Leadership And Leadership

Leadership: Leadership is a process whereby an individual influences a group of individual to achieve a common goal (pp5). However, there are many different definitions of leadership as there are people who have tried to define it because the word can have different meaning for different people. Leadership is similar to the management in many ways because they both involve influence, concerned with effective goal and work with people. Leadership helps to produce change and movement by establishing direction, such as creating the vision, clarifying big picture and set strategies. Similarly, it helps aligning people along with motivating and inspiring them (12) Women in Leadership: According to Sigmund Freud, when you meet a human being,†¦show more content†¦Women have been key players in U.S. history since colonial times. During the Revolutionary War, women were firing cannons alongside male soldiers and discussing patriotic duties to their husbands and family members. The image of the woman as ruler of the domestic sphere, while not entirely false, is proven wrong by the words and deeds of women like Abigail Adams, Charity Clarke Moore and Deborah Sampson Gannett. Aside from their gender, female leaders don t have much else in common. Some have brought peace to troubled lands, while others have strewn discontent. Some have been competent or brilliant, others inept or corrupt. They come from political positions ranging from arch-conservative to ultra-leftist and represent all the world s religions The landscape of women’s leadership emergence has been steadily shifting since the 1970s. As women’s educational achievements have increased, so have their job opportunities. In 2009, women in the U.S. accounted for 51% of all those employed in management and professional occupations.6 However, according to Catalyst, a U.S. organization promoting women in business and leadership, women hold only 14.4% of executive positions in Fortune 500

Essay on The Evolution of Human Mating - 937 Words

The Evolution of Human Mating It may seem obvious to some why people mate, however there are many facets to human mating. Psychology has shown that reasons for mating have gone beyond the scope of love and physical attractiveness. People may search for mates who resemble archetypical images of the opposite-sex parent, mates with characteristics that are either complementary or similar to ones own qualities, or mates with whom to make an exchange of valuable resources (Buss 238). Although these theories play a key role in understanding patterns in human mating preferences, evolutionary psychology and sexual selection theory provide more concrete frameworks for explaining human mating. Evolutionary framework for human mating is†¦show more content†¦Consequently, in short term relationships it has become an active part of a mans repertoire. One strategy that has evolved as a result of this problem is for males to lower their standards in looking for an acceptable mate. Such standards include age, intel ligence, personality traits, and status (whether or not she is involved in another relationship). Another strategy that has evolved is to limit the time it takes to seek sexual intercourse from a woman. More time spent on seeking sexual involvement from one female, the less time that can be spent on making another effort for sexual intercourse from another. Men prefer to spend the least time, energy, and resources in making a short-term relationship successful. It is for this reason that they look for sexual accessibility. A mans strategy for solving the problem of sexual accessibility is to look for sexual experienced women. Often men concur promiscuity to be one sign of experience. They steer away from women who seem prude, conservative, or have a low sex drive. Fertility and reproductive value are high on the list of important qualities in a short-term mate. Fertility is the probability of present reproduction. Reproductive value refers to expected future reproduction. Therefore, a younger women would have higher reproductive value that an older female because her reproductive future is longer whereas the older women has a higher fertility value than theShow MoreRelatedSex at Down976 Words   |  4 Pageswere exchanged for a woman’s fertility and fidelity. In this groundbreaking book, however, Christopher Ryan and Cacilda Jethà ¡ argue that human beings evolved in egalitarian groups that shared food, child care, and, often, sexual partners. Weaving together evidence from anthropology, archaeology, anatomy, and psychosexuality, the author’s show how far from human nature monogamy really is. Reading the book I understand that Ryan and Jethà ¡ try to explain how our promiscuous past clashes with our contemporaryRead MoreThe Strategies Of Finding A Mate1018 Words   |  5 Pagesarticle with a brief look at the history of mating and the theories that have previously been proposed. In particular he addressed Charles Darwin’s theory of sexual evolution and belief in preferential mate choice. Buss proposes that there are three components to human mating. He states that â€Å"human mating is inherently strategic†¦ mating strategies are context-dependent†¦ [and that] men and women have faced different mating problems over the course of human evolution and, as a consequence, have evolved differentRead MoreIts Always Sunny Essay1280 Words   |  6 Pagesï » ¿ It’s Always Sunny Demonstrates Evolutionary Theories All behavioral human traits are reflective of interactions between genes the environment which is described through the study of evolution and human behavior. One example of this is how a person’s adult height is shaped by their inherited genes, and also the nutrition they received as a child. The show It’s Always Sunny in Philadelphia demonstrates how humans interact with, and are affected by their environment. It’s Always Sunny in Philadelphia’sRead MoreEvolution Of Evolutionary Psychology And Culture1151 Words   |  5 PagesIn his article, Sadd (2012) explains the relationship of evolutionary psychology and culture, particularly regarding popular culture. He argues the theory of evolution is widely applicable in multiple disciplines. While evolution theory is essentially biological in nature, it can also give us insight to our culture, society and human behaviours. According to Sadd, recurrent themes in cultural forms could be explained by evolutionary psychology. He uses example of song lyrics and collective wisdomRead MoreMate Choice And Species Recognition Amongst D. Simulans1705 Words   |  7 Pagesmauritiana Brittany Wordekemper February 23, 2016 Ecology and Evolution Lab Emily Hudson Abstract Sexual selection is a kind of natural selection that happened to come about through a specific preference by one sex for definite characteristics in individuals of the opposite sex. When it comes to choosing a mate, mate choice is very important for individuals to avoid mating with the wrong species but it also operates within a species as well. The species used for thisRead MoreKim Kardashians Of The Wild1452 Words   |  6 PagesKim Kardashians of the wild? Exaggerated sexual swellings in non-human primates: mechanisms and functions Oedemas of sexual tissue with extracellular water retention and swellings of the skin of the circumanal, subcaudal and paracallosal regions (Krohn Zuckermann, 1937; Dixson, 1998a) are observed in many species of non-human primates, baboons being famous for their large bright behinds. We know that this engorged feature has evolved independently 5 times as different tissue areas are involvedRead MoreCompare And Contrast Evolution And Artificial Selection1396 Words   |  6 PagesLivan Martell PID: 4635791 PCB 3043 10/05/2017 Weekly Assignment: 4 October 2017 1) Compare and contrast evolution by artificial selection and natural selection. (Ch. 7) Natural selection is an essential process of evolution proposed by Charles Darwin and generally accepted by the scientific community as the best explanation for the adaptation and specialization of organisms. Artificial selection is a technique of reproductive control by which man alters the genes of domestic or cultivated organismsRead MoreThe Hot, Sandy Desert1447 Words   |  6 Pagesresting when it has found a suitable oasis. The majority of activity the Fire baboon participates in is similar to any of its species, often in action for food or mating related activity. When mating season approaches, the scorching temperatures of the Sahara Desert greatly affects the mating habits of the species. The Fire baboon’s mating rituals are done during the night due to their increase in energy underneath the coolness of the night. Compared to its close relative the Papio anubis, the FireRead MoreThe Origin Of Species Revolutionized The Way That Changed Through Time With Natural Selection And Divergence Of Geographical Isolation1624 Words   |  7 PagesThe theory of evolution in itself is an evolution. The way humans understand how life came to exist and how it has changed along the way reflects the different socio economic environments we have created. For any scientist, previous theory’s and ideas from historians or other scholars are used in part to form the basis of understanding of new information (Klyve, D. k. 2014). The understanding of evolution as we see it today comes from many areas of the world amid varying time periods. The most famousRead MoreThe Evolution Of Primates859 Words   |  4 Pagesresearch conducted by Canadian experts at the University of Lethbridge suggests that new behavioral trends are manifesting among primates, which has interesting implications about how the behavior of all animals undergoes its own sort of evolution, including that of human beings. The study shows apparent sex acts on the parts of female, Japanese macaques on sika deer. These acts of interspecies relations were observed in Minoh, Osaka—a city in central Japan. As uncommony documented as interspecies relations

Managing Finance Principles and Techniques NML

Question: Describe about the Managing Finance Principles and Techniques of NML? Answer: Importance of costs in pricing strategy of NML Costs are important in pricing system as it provide NML to assess the price of the different products at overall profit or making profit separately. As stated by Berry and Jarvis (2005), costing method in NML is different comparing to others. Company used least square method of costing technique as there are three different products in its portfolio. Therefore, company has to deal with many mixed cost that are hidden in production of three products (Drury, 2009). In this context, NML is using the cost based pricing staretgy where all the costs are segregated into variable cost and fixed cost, thus introducing the cost based on flexible activity in operation (Glynn etal. 2003). Total Cost 7000 8000 9000 Units 200 300 400 Break Even 35 26.66667 22.5 Selling price (if Profit = 20%) 42 32 27 It can be analysed that by applying the cost based pricing, the selling price shows different value for different cost units. In order to gain a profit of 20%, the company might have to fix selling price of 42 for each product in order to cover the total cost of 7000. Therefore, it is similar for other costs. Design of a costing system and proposed improvements in costing and pricing system A costing system may be designed on basis of activities in the operation. The system is widely used in production as it provides the company opportunity of defining its costing method according to the activities (Harris and Sollis, 2003). The limitation that is associated with the existing costing system is that it may limit the ability of the company to price their product in different market segments. On the other hand, unrealized profit or revenue would be substantial. Moreover, the future demand for any particular product may not be accounted under this method. Activities Level of output Cost in Total Cost in Activity 1 200 **** Activity 2 300 **** Activity 3 400 **** Activity 4 500 **** **** Table 1: format for activity-based costing The system adapted by NML might be improved if it is changed into an activity based costing. Due to presence of costing details of every activity of different levels, it would be easier for the managers to control the cost of overall production (de Jong et al. 2013). By employing ABC method, the company would be receiving reliable and accurate results regarding costs. Moreover, the overheads that comprise variable costs and fixed costs can be controlled by effective monitoring and controlling of activities. Therefore, effective decision can be made by the firm relating to product lines profitability. Recommendations of proposals for improving the existing system Form the point of view of costing system, it is recommended that company must follow a controlling system so that cost can be controlled in many stages and thus increasing the operating margin. In order to improve the existing costing system, the company can adopt policy of competition based pricing. It will help the company in finalizing the product price after careful analysis of prices fixed by competitors. Once the product costs are calculated then the company can fix the price of their each product. Therefore, weakness of cost based pricing of the company can be overcome by adopting competition based pricing. Forecasting techniques for revenue and cost As stated in the problem, the forecasted increase in some financial matters has changed the financial statement of company. Due to change in sales and cost of sales, the increase in operating profit has gone up by 24.66%. Unchanged interest cost in coming year provides the company to post a better PAT in 2015 as estimated. According to Lin (2012), cost can be reduced by controlling the interest cost of borrowings. Further, rising in net working capital as projected, shows the way of reducing the cost of short-term loan. 2014 2015E turnover 300 330 cost of sales (deducting depreciation) 164 180.4 operating profit 120 149.6 24.66667 interest cost 30 30 pretax profit 90 119.6 corporation tax 24 28 profit after tax 66 91.6 proposed dividend 44 48.4 retained earnings 26 43.2 Table 2: forecasting of revenue and cost The forecasting techniques that can be used by the company are moving averages and time series analysis. By using moving averages, the company would be successful to smooth the financial data and it will be easy for the company to spot trend. As a result of that, they would be known whether they will be making profit or loss in future. On the other hand, time series analysis can be effective in forecasting the revenue and costs in future by studying the historical data of the company. Therefore, on the basis of forecast, the company can make effective decision for their business. Assessment of funding method of expansion program ABZ Ltd Retained earnings: The Company can finance their expansion program by using their retained earnings. It is seen that in 2014, the company has a retained earnings of 26 million in 2014. Therefore, it can be used and by using it company may not be paying any interest to others. Banks: The financial institution can be other source to gain funds. The company can borrow money as per their requirement. However, the company has to deposit any assets as a security. On the other hand, the company can also go overdraft in order to fund their expansion program. Appropriate budgetary target for the company in next year The budgetary targets that have been selected for each of the products that are PS and TG of NML are variable costs, fixed costs and sales production. Through sales production, the company will know how much production has been made in next year in comparison to last year. Similarly, variable and fixed costs can also be studied to know much costs have incurred for each of the product. Budgetary sales unit for PS is 5000 units while opening inventory of that product is 100 units. Further, closing inventory of PS is 1100 units. Therefore, estimated units to be produced are (5000-100+1100) = 6000 units for PS in the certain period. sales and production budget: master budget The following table shows the master budget of company: PS TG Budgeted Sales 5000 1000 Required Closing Inventory 1100 50 Opening Inventory 100 50 Budgeted Production In Units 6000 1000 Selling Price 95 130 Sales Revenue 570000 130000 Variable Cost 75 85 Total Variable Cost 450000 85000 Total Fixed Cost 35000 15000 Net Income 85000 30000 Table 3: Production and sales budget It can be discussed that, the PS product will generate an income of 85000 with a total cost of 485000. Moreover, it is seen that the selling price is low in comparison to selling price of product TG. Therefore, the income that would be generated from product TG is 30000. However, it can also be noticed that, production unit of TG is less than PS due to that income and cost is less. Comparison of actual expenditure and income to master budget Actual Budgeted Income Variance Sales 4000 5000 1000 Selling Price 96 95 -1 Production 6500 6000 -500 Sales Revenue 624000 570000 -54000 Total Cost 485000 485000 0 Income 139000 85000 -54000 Actual and estimated income of PS Actual Budgeted Income Variance Sales 900 1000 100 Selling Price 125 130 5 Production 950 1000 50 Sales Revenue 118750 130000 11250 Total Cost 100000 100000 0 Income 18750 30000 11250 Actual and estimated income of TG It is seen that company has generated an income of 54000 more as per the prepared budgeted income. Therefore, product PS provided a better value to the company. The company has increased the selling price by 1 unit due to increase in the total cost. As a result, the 130000 income has been generated from the sale of PS. On the other hand, the company has witnessed a loss of 11250 from the sale of TG. The reason is decline in the sales value and production. Moreover, there is no decline in the value of total cost due to that there is significant loss of income. Impact of monitoring budgetary policy As stated by Burger and Hawkesworth (2013), preparing a budget does not make any sense as management needs to control all financial aspects as per the budget produced at the starting of the year. Therefore, monitoring of budget is an exceptional tool in this segment as it provides the management to have control over the various activities of operation. In order to monitor the budget of the company, the management has counted on variance analysis. Both favourable variances and adverse variances are known by the management. Therefore, it helps in identifying possible gap in actual figures and budgeted figures. It is true that systematic observation provides control over the deviation from the estimated figure. Moreover, financial experts are hired for monitoring budget (cipfa.org.uk, 2015). Recommended process for cost reduction From the given problem, NML may apply the process of reduction of holding inventory for lesser days as it will reduce the cost of materials in revenue account. In order to have a better control over the cost, the management can count on Total Quality Management. It will help in increasing the productivity of the company through effective management of costs. Therefore, the company can witness quality production with minimum utilization of cost. Value Analysis can be other recommendation which will be helpful in enhancing the work effectiveness. Through this, the management can identify extra or unnecessary costs that are bear by the company. As a result, the company will receive quality and better production. Activity based costing for company The activity-based costing may be used in NML in evaluating the costing of the company. It provides the means of controlling the cost of every activity mainly for a longer period of production (aat.co.uk, 2015). Through employing ABC method, activities that are related with the production process can be effectively identified. Moreover, each costs can be also be identified such as direct material, direct labour, overhead costs, etc that usually not considered. On the other hand, the cost driver can also be calculated by using ABC method such as machine hours, testing hours, labour cost, etc. Investment appraisal Financial appraisal methods for the projects and justified decision The appraisal method of selecting the project is normally considered as the quantitative approach of assessing the future of investment so that risk associated with the investment becomes low. This is the main strategy applied by the investors in a long-term perspective (Bized.co.uk, 2015). As stated by White et al. (2003), different techniques of assessments are applicable for different objectives of the investment and on project basis. In this context, net present value (NPV) method is applied for evaluating the investment decision between two projects A and B. The NPV estimation of project A provides that investment will yield 207357.24 after five years of investment and at the same for the project B will be 309806.15. Therefore, from the first look any investor will go for the project B, while it is true that the sum invested in this project is more than that of the project A. Thus, another method is necessary where irrespective of sum of the invested sum; only on basis of period of investment the rate of return might be calculated. Thereby, no decision can be made from this technique of appraisal. option A Year cash flow NPV 0 -400000 $207,357.24 1 100000 2 140000 3 180000 4 210000 5 230000 option B Year cash flow NPV 0 -950000 $309,806.15 1 250000 2 300000 3 350000 4 400000 5 450000 Table 5: Investment appraisal using NPV methods Evaluation of two options between A and B option A Year cash flow NPV IRR ARR 0 -400000 $207,357.24 27% outflow 40000 1 100000 return from investment 860000 2 140000 rate of return 20.5 3 180000 4 210000 5 230000 option B Year cash flow NPV IRR ARR 0 -950000 $309,806.15 22% outflow 95000 1 250000 return from investment 1750000 2 300000 rate of return 17.42105 3 350000 4 400000 5 450000 Table 6: Investment appraisal using IRR and ARR method From the above table, it might be observed that project A and B are appraised using the IRR and ARR method where both methods state that investors must go for the project A as the project B yields low rate of return within the period. Project A has tested better result from the both method so decision can be taken for making investment for this project. Further, it is recommended that project A is better looking in terms of assessing techniques still now so company must go for it. Report on appropriateness of strategic investment decision Investment decision making is important approach for any business to enhance their business and acknowledge growth. It is observed that only quantitative method of appraising is considered while the risk associated with the projects are not being assessed. Therefore, without knowing the facts on the qualitative information of the project risk associated cannot be evaluated. Further, the macroeconomic changes and risk associated with economic factors are always a concern for making the investment decision (Askarany et al. 2012). In this context, it is observed that two projects are not of same type therefore, macroeconomic risks associated with those are not same. Further, business risk is a main factor in assessing the projects investment decision so that company might be able to make decision on investment. Strategically it may be said that company might select the project B as it provides the company to invest more money providing more utility of unused investment fund whereas in project A, the total sum of investment is low thereby; it cannot fully utilized the investment fund (companies-house.gov.uk, 2015). Financial analysis Analysis of financial statements As per the variance analysis between two financial year data of the NML group which is certain growth in the revenue turnover of the company is around 3.45% and because of the huge number of dividends proposed by the company retained earnings on the company is showing negative figures in the statement of variance analysis of the company. The company is able is acquired 0.71% net assets increment in the financial year 2014 whereas the reserve of the company is showing growth of the 1.10% in the year 2014 respectively. According to the overall variance analysis of the company the company is showing stable situation which is in growth than the financial year 2013. Financial ratio analysis of NML According to the ratio analysis of the company NML is measured to understand the actual position of the organization in the market. The current ratio of the company is mainly depends on the measurement of the earning capacity of the company which is 1.707 and 1.709 in the year 2014 and 2013. The gross profit margin of the company is also shows the percentage of the 30% and 28.44% in the year 2014 and 2013 and also the net profit margin of the NML group is 22% and 20.87% respectively. The inventory turnover of the company NML is showing ratio of the 2.5 and the 2.9 in the financial year 2014 and 2013. The return on equity ratio which is coming 0.33 and 0.30 which is company gaining from the investment of the owned capital in the companys operational activities. Recommendations on strategic portfolio of NML As per the financial details provided by the company in a particular financial year which is 2013 and 2014; It is showing that company is more focusing in the proposing dividends for the company which is good for the portfolio of the company in front of the investors who are willing to invest their money in the shares of the company because of the higher dividend earnings ratio. The company NML group is not able to retained the earnings for the financial year 2014 but company will be grow in the coming financial because of the huge investment finance from the investors who attracts because of the proposed dividend of the company. Reference lists Books Berry A and Jarvis R Accounting in a Business Context, (2005) (Cengage Learning EMEA) ISBN 1844802515 Drury C Management Accounting for Business, (2009) (Cengage Learning EMEA) ISBN 1408017717 Glynn J, Perrin J, Murphy M and Abraham A (2003) Accounting for Managers, 3rd Edition (Thomson Learning) ISBN 186152904X Harris R and Sollis R (2003) Applied Time Series Modelling and Forecasting (John Wiley and Sons) ISBN 0470844434 White G I, Sondhi A C and Fried D (2003) The Analysis and Use of Financial Statements, 3rd Edition (John Wiley and Sons) ISBN 0471375942 Journals de Jong, M., van Beek, I. and Posthumus, R. (2013). Introducing accountable budgeting.OECD Journal on Budgeting, 12(3), pp.1-34. Lin, W. (2012). Financial performance and customer service: An examination using activity-based costing of 38 international airlines.Journal of Air Transport Management, 19, pp.13-15. Burger, P. and Hawkesworth, I. (2013). Capital budgeting and procurement practices.OECD Journal on Budgeting, 13(1), pp.57-104. Askarany, D., Brierley, J. and Yazdifar, H. (2012). The effect of innovation characteristics on activity-based costing adoption.International Journal of Managerial and Financial Accounting, 4(3), p.291. Websites aat.co.uk, (2015). Available from: https://www.aat.co.uk [Accessed on: 11 Apr. 2015]. Bized.co.uk, (2015).Business studies teaching and education resources: Biz/ed. Available from: https://www.bized.co.uk [Accessed on: 11 Apr. 2015]. cipfa.org.uk, (2015). Available from: https://www.cipfa.org.uk [Accessed on: 11 Apr. 2015]. companies-house.gov.uk, (2015). Available from: https://www.companies-house.gov.uk [Accessed on: 11 Apr. 2015].

To An Athele Dying Young Essays - To An Athlete Dying Young

To An Athele Dying Young To an Athlete Dying Young by A. E. Housman is a piece about one of the most tragic fates. That fate, of course, is dying at a young age. The first thing that must be determined is who is telling the poem. I believe it is an older man, one who had been a champion of sorts in his younger days. He seems to know and understand what the athlete had felt and what would have become of him. Lines eleven and twelve are good examples that show that the speaker has had some experience with success. The lines read, "And early though the laurel grows It withers quicker than a rose." To comprehend this, you must first know what a laurel is. In ancient times, it was a type of decorative wreath made for distinguished and honored people. The athlete never actually had one of these, as the word laurel is only used to convey how proud the townspeople were of the young athlete. Now that we know what a laurel is, we can now understand the full effect of lines eleven and twelve. The speaker is perhaps saying that the glory and praise of being a winner will fade very quickly, as it did with him. Through the speaker's thoughts, you start to get a glimpse of what his life may have been since his youth: his own records broken, his skills diminished, his name forgotten. Instead of being a poem about the death of the athlete, the poem becomes a statement about the life of the speaker. In line eighteen, as one of"the lads who wore their honors out," the speaker seems to be also mourning his own personal demise as a star athlete. Now that we have postulated who the speaker is and all of his thoughts, we can now determine where the poem is occurring. I believe it is taking place at a funeral or some sort of funeral procession. The speaker seems to be observing the deceased athlete, so he must be on display in some manner. Also, the poem is about an athlete in a small town. The entire community is stricken with grief and is mourning the loss together. This is evident in lines five and six: "Today, the road all runners come, Shoulder-high we bring you home..." Line five shows us that everyone is coming to the funeral, even his competitors and the other runners. Also, the use of "we" is a signal of the entire community gathering to honor the young lad. They were together in celebration of his victory and now are together in mourning his death. The tone of To an Athlete Dying Young is definitely one that many will remember after reading it. The first stanza tells about the past accomplishments and celebrations of the athlete. "The time you won your town the race" shows his success in the past. The tone starts out to be one of pride for the athlete, but soon it changes to a very melancholy and solemn one. The next three stanzas are very depressing and tell of a young man who's "Eyes the shady night has shut." The final stanzas are perhaps the most dreary of all. They look to the future, a future of things undone, a life unlived, and a young man dead too soon. The tone of the story is very poignant and one that cannot easily be shaken from memory. The tone may be a very depressing one, but the theme is even more piercing. The theme of To an Athlete Dying Young is not apparent after one reading. I gave it much thought and have come to one eerie conclusion; the speaker is viewing the premature death in a positive light. To most, that is a terrible or even sinful thing to contemplate, but it is indeed what the speaker is conveying. The theme of this poem is that it is better to die as a young champion than to grow old and be forgotten by all those who surpass your one-time greatness. He calls the dead athlete a "smart lad" for dying as a champion and not remaining in the "fields where glory does not stay." He then compares early death to growing old and being forgotten in the lines "And silence sounds no worse than cheers After earth has stopped the ears." That is a very powerful statement. The speaker honestly believes that it is just as well to die young

Five ways tools can help you tackle Twitter - Emphasis

Five ways tools can help you tackle Twitter Five ways tools can help you tackle Twitter The basic Twitter.com platform is surprisingly inflexible. For example, it doesnt allow you to schedule tweets for later, monitor how many people have clicked on your links, combine multiple accounts or view more than one stream of information at a time. So most people who embrace Twitter use a variety of tools and apps to improve their experience. 1. Dashboard Two of the most popular dashboards are Tweetdeck (which started out as a separate entity but was bought by Twitter in May 2011) and Hootsuite. Both are free and let you view several streams simultaneously (for example your own tweets, replies to your tweets, direct messages or your timeline) in adjacent columns. Theyre also good for managing multiple Twitter accounts at the same time, and scheduling tweets. The main difference is that Tweetdeck is a desktop app so its not ideal if you hotdesk or work from several locations, while Hootsuite is browser based and therefore more portable. 2. Scheduled tweets Buffer offers even easier tweet scheduling, where instead of programming in a time and date for each tweet, you simply set a pattern. For example, you could program it to send two tweets a day, at 12.30pm and 3.30pm, Monday to Friday. Then you just fill up the dashboard with your tweets and drag and drop them into the order you want. It also tracks the performance of tweets sent through Buffer, letting you know how many clicks, retweets, replies and favourites they received, as well as their potential reach. 3. Collaborative tweeting If youre setting up a Twitter account that several people will contribute to, GroupTweet is well worth a look. It allows multiple users to post tweets to one account, either through the GroupTweet dashboard, or via their personal account using the relevant @ address or hashtag. The basic version is free, but if you want to be able to moderate and schedule tweets, youll need to upgrade at a cost of $4.99 a month. 4. Collating tweets On Twitter.com, your tweets dont stay around for long. If you need to retrieve something that you tweeted, or was tweeted to you, more than a couple of weeks back, youll be lucky if you can still find it. Searching in Google can help, but it depends how far back you want to go. Rather than digging around to try and find important tweets after the fact, favourite them at the time. Or if youre having a discussion and you want to save all of it, use Storify. Its great for saving brainstorming sessions for later heres one of mine discussing the differences between lunch, tea and dinner (a brainstorm of such epic dimensions that I still havent written the article I intended to). 5. Performance analysis It can be tempting to try to measure your Twitter performance, but proceed with caution. Basically, youre already doing it right if people are talking to you, RTing you or opening your links, and if your number of followers is growing. However, if you do want a little feedback, there are services available. Just remember to take what they say with a pinch of salt, and not get too caught up in the idea of performance after all, its about communication and relationships, not numbers. One interesting service is Crowdbooster, which shows you which of your tweets have been most popular and how many people they have potentially reached (it calls these impressions). It also reminds you about tweets you havent yet replied to, offers you the opportunity to schedule tweets for later and even advises you about what it thinks is the best time of day to tweet to your followers. If you just want to use it with one Twitter account, its free. To add more, youll have to pay ($39 a month for ten accounts, $99 a month for 30 accounts). A more controversial service is Klout, which scores your social influence between 1 and 100 based on data such as follower and following numbers, retweets and interactions. Its accuracy, however, is debatable. For example, it thinks I am influential not just about Brighton (fair enough, I live there) but Afghanistan and the Chicago Bears (neither of which I recall ever tweeting about). Over to you What tools do you use and recommend, and why? Well be writing more about Twitter in the new year, so wed love to hear your tips. You can either comment below or tweet us on @EmphasisWriting. Want more guidance on how to write for Twitter? See our Four tips for effective tweeting.

13 Kick-Ass Tips for Writing Fantasy Fiction

13 Kick-Ass Tips for Writing Fantasy Fiction 13 Kick-Ass Tips For Writing Fantasy From Professional Fantasy Editors Has there ever been a better time to be writing fantasy? Where once it was a fringe genre, now fantasy is everywhere in pop culture, from Harry Potter to the memes surrounding Jon Snow.There’s also never been a more exciting time to write fantasy. The genre is changing daily, as authors such as Neil Gaiman, Susanna Clarke, and Patrick Rothfuss continue to interpret, subvert, and stretch it to attain new pinnacles. What’s more, the public can't seem to get enough of it, proving that there is a market for fantasy - and it’s a big one.So, if you’re an author, where can you find a place for yourself in today’s talent-rich terrain?In our search for the finest writing tips in the realm, we spoke to seven of the top fantasy editors on our marketplace. They’ve worked with George R.R. Martin, James Dashner, Brandon Sanderson, and many more of the brilliant authors who are re-defining the genre. Here’s what they said.1. Identify your marketIf y ou don’t know your market, you’ve already made a mistake, says Erin Young, an agent for Dystel Goderich Bourret, which represents authors such as James Dashner of Maze Runner fame.â€Å"Oh, my market is fantasy,† you might say, waving your monthly subscription of Imagination And Me. But is your story steampunk, urban, or grimdark fantasy? Is it for children or  young adults? Are there elves or tech? Is it set in the modern world, or is it a re-imagining of an alternate past? Jonathan Strange and Mr. Norrell, for instance, doesn’t target Discworld’s readers, and no-one would instinctively group Harry Potter and Stephen King's The Dark Tower in the same category. Castle Ruins, art by Jeff Brown.â€Å"You’re absorbing ideas. You're absorbing grammar. You're absorbing sentence structure and rhythm and prose,† she says. â€Å"Read books with description or dialogue you admire. Read the books that are classics- they are classics for a reason- and read the books that are bestsellers and read the books that are award winners. Read and read and read, and you'll start to see your own writing improve.†To take specific action, Nieveen suggests picking the 10 books that you most admire. Then, it's just a matter of re-reading them and noting strengths in their plot, dialogue, characters, and scene structure.  Learn from the best - and then go forth and tilt the arena again yourself.What are your tips for writing fantasy? Leave them in the comments below. You can also check out our list of the 100 best fantasy series ever  for inspiration!

Social Media and Mobile Search Marketing in Saudi Arabia Research Proposal

Social Media and Mobile Search Marketing in Saudi Arabia - Research Proposal Example According to reports released recently, there are approximately over three million Saudi Arabian Internet users who spent over three billion dollars in making purchases through ecommerce in the year 2010 (Bartlett, 2001). The biggest selling products were electronics which came second to the sale of software products during the year 2010 (Hillman et al, 2008). This implies that businesses who had invested in the internet during the year made big profits as a result of their investment activities. Hotels and airports also recorded booming online business, as they were the top earners for online businesses in the kingdom (Borysowich, 2010). Currently, reports indicate that there are signs that these values will continue rising within the next few years. This is because more people in their populations are joining the Internet and the service providers have also upgraded their systems (Hillman et al, 2008). For instance, the STC Company within the country has upgraded her broadband leve ls of penetration from 4% to 22% in the remote areas of the nation which were previously not able to access the service (Ader, 2008). This means that there is great support for similar businesses from the providers as they will be able to reach and trade with more citizens along with non-citizens in a more effective manner (Vithal and Jansen, 2009). The marketers participating or rather using the Internet should therefore begin developing their campaigns in the service. This is in view of the infrastructural developments going on and the profitable nature of ecommerce within the country (Hillman et al, 2008). There are predictions made that suggest that Internet spending is going to be on the rise as more of the wealthy people in the nation get faster access to the Internet. This is... As the discussion stresses the marketers participating or rather using the Internet should therefore begin developing their campaigns in the service. This is in view of the infrastructural developments going on and the profitable nature of ecommerce within the country. There are predictions made that suggest that Internet spending is going to be on the rise as more of the wealthy people in the nation get faster access to the Internet. This is in addition to the improvements being made in payment gateways to facilitate safer and faster transfers of funds. It is therefore the ideal moment for investors willing to invest in the sector to start exploring safe avenues and businesses to indulge in. This paper discusses that the use of the Internet within the Saudi Arabian population has led to an increased awareness of their rights and has also helped reduce the oppression against their women. For example, a campaign was started in the country using YouTube videos to sensitize the people on the right of a woman to drive. This was after the site highlighted the plight of a woman who was arrested on two separate occasions for driving and put into custody despite her driving safely. The aired clip raised a great stir within the population and this is a good example of just how influential the Internet is within the country. The Internet has been widely used across many family lines and countries to connect people and businesses, which makes it a suitable tool for marketing products to the population.

Consequences of the new deal Essay Example | Topics and Well Written Essays - 250 words

Consequences of the new deal - Essay Example Meanwhile the Republicans were either contrasting the whole New Deal as an adversary of growth and commerce or accepting part of it, undertaking to make it better. Historians have distinguished between a â€Å"First New Deal† in 1933 and a â€Å"Second New Deal† between 1934 and 1936. The â€Å"First New Deal† was apprehensive with sectors which demanded urgent economic recoveries like banking, industry and farming. The â€Å"Second New Deal† focused on the Wagner Act which aimed at promoting labor unions, the Social Security Act, the Works Progress Administration (WPA) which was a relief program. Other programs aided migrant workers and occupant farmers. The other significant legislation of New Deal is the Fair Labor Standards Act (1938). It set the maximum hours and minimum wages for most groups of workforce (Henretta, Brody, Fernlund and Benjamin p233). Though the New Deal never stopped the Depression, it did have some notable consequences. The WPA program increased employment opportunities. The public was also confident of the government and there was a substantial rise in the power and size of federal government. The Social Security Act was a key milestone relative to the New Deal programs. Finally, the national government took an active role in the welfare of its citizens (Henretta, Brody, Fernlund and Benjamin

Greenland Glaciers and Global Warming Essay Example for Free

Greenland Glaciers and Global Warming Essay Global warming, which is the increasing of the average temperature within the air near the Earths surface and the oceans, has caused the glaciers in Greenland to melt, causing the water levels to rise and the climate to change. Global warming is an unfortunate event that is taking place in numerous parts of the world, enabling bizarre and, in some instances, unnatural changes in the weather. Global warming has become most noticeable in the polar regions, amongst the polar icecaps, or in the more iced-over regions of the world, such as in Greenland and the Atlantic Ocean. In fact, Greenland has become the most common area for quickly-dissolving glaciers, making it the most notorious for climate and weather changes throughout the world. It is difficult to connect weather changes to global warming, though it has been proven that some more pronounced changes are likely to come about, and in fact, already are. One of the most obvious changes involves an increase in precipitation, as well as changes in the average patterns of precipitation, which can lead to flooding and, in turn, drought. The sea levels worldwide will rise, and are rising, as the glaciers melt, which will cause Arctic shrinkage the shrinking of the Arctic region due to climate change. In time, this shrinkage could possibly be seen in other areas, including the Atlantic Ocean. Some other irreversible affects include the frequency and intensity of extreme weather events, such as hurricanes and tsunamis. With the continuously melting Greenland glaciers, these risks are more likely to happen and these changes will only become more obvious and the melting becomes more rapid. Jason Box, a professor at Ohio State and a global warming researcher, has noticed a rapid and unsettling change in the amount of glaciers in Greenland. In an interview in regards to the melting glaciers and global warming, Box stated that we fly over the worlds fastest-deteriorating glacier; and in 2003, we didnt even recognize the place. It had doubled its speed (of shearing off ice) and lost about 6 miles of width (Feran). Box goes on to state the worries that he feels about global warming, as well as pointing out a slight change to weather happenings around the world for instance, a snowstorm in an area that, despite being cold, has never seen such harsh weather. Box feels that this weather event can be linked simultaneously with global warming from the Greenland region. In further studies done by scientists and other global warming researchers, it has been discovered that a huge portion of the Atlantic region is warming just as much and just as fast as the rest of the world (Wilkinson). The scientists have researched and discovered that the temperature has risen 2. 5 degrees in the past half century and that there has been a 140 percent ice loss within a decade. This has caused ice shelves to break up or disappear, exposing the glaciers behind them and speeding up the discharge of ice and fresh water into the ocean (Wilkinson). In the article, Dr. Ian Allison of the Australian Antarctic Division says that the activities taking place in the Atlantic are related to the rising of the air and water temperatures. Allison also stated that the melting of the Greenland glaciers are of the biggest concern, saying that its changes are even more noticeable than those of other regions. In Greenland, the rate of ice loss is getting greater over the last 10 years and the surface ice melt is definitely related to the warming. Allison, whos main focus is that of the Arctic and Atlantic regions, has been keeping close note on the melting glaciers, as well as trying to compare them to changes that have been taking place with weather. The more ice that the Atlantic loses, as well as the rest of the regions under the pressure of global warming, the more heat that comes back to it. When there is no ice to reflect the heat of the sun, the heat permeates through the water, causing the water to warm up even more. The heat is then spread to the remaining glaciers, which causes an almost domino effect, repeating itself until all that can happen is for the sea levels to rise. According to Alan Boyle, a science editor, Greenlands glaciers have been dumping ice into the Atlantic Ocean at a rate thats doubled over the past five years, as researchers have reported. Yet there are many scientists and researchers that are not as worried about the melting of the glaciers as others are; they claim that Greenland has gone through warming before, but the heat had been followed by cooling temperatures. Many of the researchers feel that the same thing is happening again. These scientists are not disregarding the possibility of global warming, but are wary to rule in Greenland as a current problem. Other scientists are against this, saying that Greenland has been warming up 2. 2 times faster than it has in previous years. Greenland is home to one of the worlds largest, and one of the most quickly dissolving, glacier, the Kangerdlugssuaq Glacier. The aforementioned glacier has gone from being completely stationary as of 1996 to flowing at a rate of fourteen kilometers a year by 2005; it is because of this that it is considered one of the fastest moving glaciers on the planet. It is also because of this, as well as Greenlands other quickly-melting glaciers, that will play a huge, unwanted role in the rising of the worlds sea levels (Biello). Greenland has become one of the biggest concerns of scientists, due to the alarming rate that its glaciers are melting, as well as to the obvious increase in the temperature. Since Greenland is home to some of the most quickly melting glaciers, as well as to the worlds largest, it will be one of the main purveyors of climate and weather changes throughout the world. Bizarre changes in weather have already been noticed, with many scientists blaming global warming on these changes. Regardless of the fact that Greenland is in a region of its own, what is taking place with its glaciers can affect the entire world; the weather will be the most pronouncedly changed. Horrific weather events will last longer than what is considered average, and they can take place in areas that would not normally see such conditions. Works Cited Biello, David. (17 Feb 2006. ) Greenlands glaciers: Melting and on the move. Scientific American. Retrieved March 24, 2009, from http://www. sciam. com/article. cfm? id=greenlands-glaciers-melti. Boyle, Alan. (16 Feb 2006. ) Greenlands glaciers losing ice at faster rate. Retrieved March 24, 2009, from http://www. msnbc. msn. com/id/11385475/. Feran, Tim. (24 March 2009. ) Glacier warning us, OSU researcher says. The Columbus Dispatch. Retrieved March 24, 2009, from http://www. columbusdispatch. com/live/content/life/stories/2009/03/24/2_NOVA_ICE. ART_ART_03-24-09_D5_9ADB1F1. html? sid=101. Wilkinson, Marian. (23 March 2009. ) The ice caps are in trouble. The Sydney Morning Herald. Retrieved March 24, 2009, from http://www. smh. com. au/environment/earth-hour/theice-caps-areintrouble-200

Random Essays :: essays research papers

31) After the attack on Pearl Harbor, the feelings of animosity in America against Japan increased. By late 1945, the Allied leaders met in Germany with news of a secret new weapon, called the atomic bomb, created by American scientists, that was powerful enough to destroy an entire city. However, there were some feelings that the bomb was too powerful, and the leaders chose instead to send the Potsdam Declaration to Japan warning them to surrender. The Japanese military did not know about the atomic bomb and ignored the warning, so on August 6th 1945, an American bomber called the Enola Gay was dropped on Hiroshima, Japan. This blast killed an approximated 70,000 people and destroyed more than eighty percent of the city, but the Japanese still did not surrender. The US dropped a second atomic bomb, and after a furious debate in the Japanese cabinet, the emperor of Japan announced a surrender. This day on the 14th of August became known as V-J Day, for Victory over Japan. 32) a & b) The approach to bring discrimination cases before the courts that I would have disagreed with most would have been using violence to gain attention. This approach only caused an uproar that required law enforcement and resulted in injuries of many people. Although it did bring attention, it brought the wrong sort of attention that they were seeking. The courts possibly would have been less eager to see their cases after acts of violence, since it only demonstrated rebellion. 33) a & b) President Lyndon Johnson proposed the development of a plan called the Great Society, which was a plan with an ambitious goal to improve the standard of living of every American. One of these important Great Society programs was Medicare. This plan helped to pay the hospital bills of citizens over the age of 65. Similar to this program, Medicaid gave states money to help poor people of all ages with medical bills. Along with this, he fought to help Americans who lived below the poverty line. The Economic Opportunity Act was passed in 1964 to set up job-training programs for the poor. It also gave loans to businesses poor sections of the cities and offered loans to poor farmers. 34) Among the recent advances in science and technology, the development of computers has become a part of everyday life in American culture. Random Essays :: essays research papers 31) After the attack on Pearl Harbor, the feelings of animosity in America against Japan increased. By late 1945, the Allied leaders met in Germany with news of a secret new weapon, called the atomic bomb, created by American scientists, that was powerful enough to destroy an entire city. However, there were some feelings that the bomb was too powerful, and the leaders chose instead to send the Potsdam Declaration to Japan warning them to surrender. The Japanese military did not know about the atomic bomb and ignored the warning, so on August 6th 1945, an American bomber called the Enola Gay was dropped on Hiroshima, Japan. This blast killed an approximated 70,000 people and destroyed more than eighty percent of the city, but the Japanese still did not surrender. The US dropped a second atomic bomb, and after a furious debate in the Japanese cabinet, the emperor of Japan announced a surrender. This day on the 14th of August became known as V-J Day, for Victory over Japan. 32) a & b) The approach to bring discrimination cases before the courts that I would have disagreed with most would have been using violence to gain attention. This approach only caused an uproar that required law enforcement and resulted in injuries of many people. Although it did bring attention, it brought the wrong sort of attention that they were seeking. The courts possibly would have been less eager to see their cases after acts of violence, since it only demonstrated rebellion. 33) a & b) President Lyndon Johnson proposed the development of a plan called the Great Society, which was a plan with an ambitious goal to improve the standard of living of every American. One of these important Great Society programs was Medicare. This plan helped to pay the hospital bills of citizens over the age of 65. Similar to this program, Medicaid gave states money to help poor people of all ages with medical bills. Along with this, he fought to help Americans who lived below the poverty line. The Economic Opportunity Act was passed in 1964 to set up job-training programs for the poor. It also gave loans to businesses poor sections of the cities and offered loans to poor farmers. 34) Among the recent advances in science and technology, the development of computers has become a part of everyday life in American culture.

Chemical Reactions Essay

Introduction In this paper you learn about the reactions that occur between backing soda and lemon juice. We will also describe what is occurring with the molecules on a molecular level. Lastly we will explain what chemical bonds are formed and or broken when lemon juice and backing soda. Observations of the Reactants When most people hear baking soda they think of the bright orange box sitting in their pantry or refrigerator soaking up the foul odors that have come about from the onions or fish. Some may think of pancakes or baking a cake. Baking powder is a fine white substance with the consistency of powdered sugar. Baking soda is a chemical base. Another substance most people do not recognize as a chemical in their household is Lemon Juice. This is a liquid mixture of water and citric acid. Its color is mildly foggy and a pale yellow. Lemon juice is a chemical acid and when mixed with a base like baking soda creates a reaction. Reactions that occur Mixing lemon juice with baking soda gives you a chemical reaction. The lemon juice contains citric acid. The citric acid from the lemon juice will donate a hydrogen ion (H+) to the bicarbonate or baking soda (NaHCO3). When the bicarbonate is mixed into solution, the bicarbonate acts as a base and takes the H+ ion from the citric acid to form carbonic acid (H2CO3) and carbon dioxide (CO2). Whenever a chemical reaction produces gas, it will be highly favored due to its large increase in entropy associated with the gas formation. In this reaction, you will notice the solution bubbling and foaming due to the CO2 production. The reaction of lemon juice and baking soda is as follows: C6H8O7 + 3NaHCO3 Na3C6H5O7 + 3H2CO Essentially, one molecule of citric acid will react with three molecules of sodium bicarbonate. This will form one molecule of sodium citrate and three molecules of carbonic acid. It is a very exothermic chemical reaction. Molecular Level Baking soda or sodium bicarbonate is a salt while lemon juice is a citric acid. When combined, on a molecular basis, the acid in the lemon juice is able to lose a hydrogen (H+) ion while the sodium bicarbonate (NaHCO3) of the baking soda is able to gain an ion. Mixed in a solution, the NaHCO3 dissociates into a sodium (Na+) and bicarbonate (HCO3-) ion. The HCO3- then takes the H+ ion to form H2CO3 (carbonic acid). Bonds that formed and broken The bonds that are forming between the lemon juices and backing soda are polar covalent bonds. The bonds have an uneven electron share which is known as a dipole moment that makes them insoluble. Each the backing soda and the lemon juice have bonds that are broken. The bonds that are broken in the citric acid are when the H+ ions are taken away to form the H2CO3 and CO2. While this is happening the two molecules are sharing there atoms which is making then fight one another. So in return the baking soda does not naturalize the lemon juice like most acids and bases do. This is the violent bubbling reaction you see occur when the two are mixed. Conclusion Backing soda and lemon juice are two very few reactants that react the way they do. Normally a base and an acid turn neutral. This is not the case between these two chemicals. The molecules fight on another casing them to react violently resulting in the bubbling situation that is observer. As you have learned these two chemicals react in a way to form a gas called carbon dioxide. The color changed mildly to form a fogy white color. When it is compared on a pH level it is stronger than stomach acid. This experience has showed us that different reactants react in many different ways and that is why it is important to observe them many different items before make an assumption. Reference Swindells, J. (n.d.). What does lemon juice and baking soda do?. Retrieved from http://www.blurtit.com/q7839108.html Tro, N. J. (2009). Introductory chemistry. (3rd ed.). Upper Saddle River, NJ: Pearson/Prentice Hall. What is the chemical equation for lemon juice and baking soda. (n.d.). Retrieved from http://wiki.answers.com/Q/What_is_the_chemial_equation_for_lemon_juice_and_baking_soda

Electromechanical Energy Conversion

Introduction Chapter 3 Electromechanical Energy Conversion Topics to cover: 1. Introduction 3. Force and Torque 5. Friction 2. Electro-Motive Force (EMF) 4. Doubly-Excited Actuators 6. Mechanical Components Introduction (Cont. ) For energy conversion between electrical and mechanical forms, electromechanical devices are developed. In general, electromechanical energy conversion devices can be divided into three categories: – Transducers (for measurement and control), which transform signals of different forms. Examples are microphones, pickups, and speakers Force producing devices (linear motion devices), which produce forces mostly for linear motion drives, such as relays, solenoids (linear actuators), and electromagnets. – Continuous energy conversion equipment, which operate in rotating mode. A device would be known as a generator if it convert mechanical energy into electrical energy, or as a motor if it does the other way around (from electrical to mechanical). Lor entz Force & EMF Lorentz force is the force on a point charge due to electromagnetic fields. It is given by the following equation in terms of the electric and magnetic fieldsF ? q(E? v? B) The induced emf in a conductor of length l moving with a speed v in a uniform magnetic field of flux density B can be determined by a e ? ?v? B? ? dl ? b In a coil of N turns, the induced emf can be calculated by e ? ? Concept map of electromechanical system modeling d? dt where ? is the flux linkage of the coil and the minus sign indicates that the induced current opposes the variation of the field. It makes no difference whether the variation of the flux linkage is a result of the field variation or coil movement. EMF EMF – Example: EMF in a Linear Actuator – Example SolutionSketch L(x) and calculate the induced emf in the excitation coil for a linear actuator shown below. Assuming infinite permeability for the magnetic core and ignore the fringing effect, we can express the self inductance of the coil as L? x ? ? where Rg ? x? ? N2 ?o N 2 l ?d ? x? ? Rg ? x ? 2g L(x) L(0) 2g ?o ? d ? x? l O is the air gap reluctance. ? e? ? N 2l d? d ? Li ? di dL dx di ? ? L ? i =L? x ? ? i o v 2g dt dt dt dx dt dt EMF – A Single Conductor in a Uniform Field e ? ? I dc If i=Imsin? t , e? Force and Torque – Example Solution (Cont. ) If i=Idc , ?o N 2 l 2g ? Im ? Im ?o N 2l 2gFor a single conductor in a uniform magnetic field, we have v ? d ? x I m cos ? t ? vI m sin ? t ?o N l 2 2g ?o N 2 l 2g d Fm ? Il ? B ?o N 2 l In a rotating system, the torque about an axis can be calculated by 2g d ? x cos? t ? v sin ? t ? ? T? r ? Fm v ? ? ? ? d ? x ? ? ? ? d ? x ? 2 ? 2 ? v 2 cos t ? arctan? ? where r is the radius vector from the axis towards the conductor. B Fm l I X Force and Torque – A Singly Excited Actuator Consider a singly excited linear actuator. After a time interval dt, we notice that the plunger has moved for a distance dx under the action of the force F.The mechanical work done by the force acting on the plunger during this time interval is thus dWm ? Fdx Force and Torque – A Singly Excited Actuator The amount of electrical energy that has been transferred into the magnetic field and converted into the mechanical work during dt is dWe ? dWf ? dWm ; dWe ? eidt ? vidt? Ri2dt e ? d? dt ? v ? Ri Because dWf ? dW ? dW ? eidt ? Fdx ? id? ? Fdx e m we obtain From the total differential dW f ? ? , x ? ? ? W f , x ? i? Therefore, ? W f , x ? d? ? and ? W f , x ? ?x F dx ?W f ? ? , x ? ?x Force and Torque Force and Torque – A Singly Excited Actuator (Cont. ) A Singly Excited Actuator (Cont. ) From the knowledge of electromagnetics, the energy stored in a magnetic field can be expressed as ? Wf ? ? , x? ? ? i? ? , x? d? In the diagram below, it is shown that the magnetic energy is equivalent to the area above the magnetization or ? -i curve. Mathematically, if we define the area underneath the magnetization curve a s the coenergy (which does not exist physically), i. e. 0 For a magnetically linear (with a constant permeability or a straight line magnetization curve such that the inductance of the coil is independent of the excitation current) system, the above expression becomes 1 ? Wf ? ?, x? ? 2 L? x? and the force acting on the plunger is then F ?Wf ? ?, x? ?x 1 ? ? ? dL? x? 1 2 dL? x? ?i 2 ? L? x? ? dx 2 dx ? 2 we can obtain Wf ‘ ? i, x? ? i? ?Wf , x? ? Wf (? , x ) dW f ‘ ? i , x ? ? ? di ? id? ? dW f ? ? , x ? ? ? di ? Fdx Therefore, ? ?W f ‘ ? i , x ? ?i ? W f ‘ ? i , x ? ?i di ? and ?W f ‘ ? i , x ? ?x F? dx ? W f ‘ ? i , x ? ?x (? , i ) Wf ‘ ( i, x ) O i Force and Torque Force and Torque – A Singly Excited Actuator (Cont. ) – Example 1 Calculate the force acting on the plunger of a linear actuator as shown below. From the definition, the coenergy can be calculated by iWf ‘ ? i , x? ? ? ? ? i , x? di ? 0 Wf ‘ ? i, x? ? ? (? , i ) Wf (? , x ) For a magnetically linear system, the above expression becomes Rg 1 L? x? i 2 2 Ni Wf ‘ ( i, x ) Rg and the force acting on the plunger is then F? ?Wf ‘ ? i , x ? ?x 1 dL? x ? ? i2 dx 2 O i (c) Force and Torque Force and Torque – Singly Excited Rotating Actuator – Solution to Example 1 Assume infinite permeability for the actuator core. The self inductance of the excitation winding can be readily obtained as L? x? ? N 2 ? o N 2l? d ? x? ? 2Rg 2g Therefore, the force acting on the plunger is F? ? Rg Ni ?l 1 2 dL ? x ? 2 i ? ? o ? Ni ? 2 dx 4gThe minus sign of the force indicates that the direction of the force is to reduce the displacement so as to reduce the reluctance of the air gaps. Since this force is caused by the variation of magnetic reluctance of the magnetic circuit, it is known as the reluctance force. Rg The singly excited linear actuator becomes a singly excited rotating actuator if the linearly movable plunger is repla ced by a rotor. Through a derivation similar to that for a singly excited linear actuator, one can readily obtain that the torque acting on the rotor can be expressed as the negative partial derivative of the energy stored in the agnetic field against the angular displacement or as the positive partial derivative of the coenergy against the angular displacement. Force and Torque Solution b) Voltage induced – Example †¢ The magnetically-linear electro-mechanical circuit breaker as shown is singly-excited via a N-turn coil. Its magnetic reluctance varies with the angle ? as R ? Rm? ? R0 , where Rm and R0 are constant. †¢ Derive the torque developed by the field from the system co-energy. †¢ When the device is excited with a direct current i=I, the angular displacement increases quadratically as ? ?t ? ? 1 ? t 2 ? ?t ? ? 0 , 2 where ? ? and ? 0 are constant. Find the voltage induced in the coil . Singly Excited Rotating Actuator Total turns, N = N1 + N2 Frame relu ctance Rf ? rf 2 Gap reluctance Rg ? 2rg ? ? lf 2? 0 ? r wd 2lg ?0rd (2? ? ? ) , 2? ? 760 ? 1. 33 rad Rg(? ) Rcore ?g Rarmature Fm=Ni e(t ) ? ? N 2 IRm (? t ? ? ) [ R0 ? Rm 1 ? t 2 ? ?t ? ? 0 ]2 2 ? Singly Excited Rotating Actuator ? Singly Excited Rotating Actuator airgap length, lg = 0. 001 m airgap radius, r = 0. 0745 m airgap depth, d = 0. 0255 m frame length lf = 0. 496 m limb width w = 0. 024 m Singly Excited Rotating Actuator ? (? ) ? T? ? NI R f ? Rg (? ) lf Rf ? 2 ? ? r wd Magnetic flux at equilibrium : ? NI ?0 ? ? ? R (? ) ? R f ?g ? ? ?0 NI lf 2 ? 0 ? r wd ? lg ?0rd? ? , Rg ? 2l g ?W f? ? ? ? N2 ? ?, ? R (? ) ? R ? f? ?g dRg dRg 2l g sign(? ) , where ? d? d? ?0 rd (2? ? ? )2 1 2 ? L(? ) 1 2 ? I ?I 2 2 122 ?1 IN 2 ?Rg (? ) ? R f ? 2 2l Rr sign(? ) 1 ? ? I 2N 2 , where Rr ? g 2 2 ?0 rd 4 ?Rg (? ) ? R f ? (2? ? ? ) ?0 rd (2? ? ? ) Restoring Torque ?1, x ? 0 sign ( x ) ? ? 1, x ? 0 NI? 0d lf l ?g 2 ? r w r? Force and Torque Singly Excited Rotating Actuator – Sing ly Excited Rotating Actuator (Cont. ) Torque Nm Flux mWb Flux, Torque for 2-pole motorEnergy In g eneral, 1. 5 Coenergy dW f ? id? ? Td ? dW f ‘ ? ? di ? Td ? ? i W f ? ? , ? ? ? ? i ? ? , ? ?d ? W f ‘ ? i , ? ? ? ? ? ?i , ? ?di ?W f ? ? , ? ? i? ?W f ? ? , ? ? T ?W f ‘ ? i , ? ? ?i ?W f ‘ ? i , ? ? T? 0 1. 0 mWb, Nm 0. 5 0 If the permeability is a constant, W f , ? ? ? 0. 0 0 5 10 15 20 25 30 35 40 45 rotor angle 50 55 60 65 70 75 80 1 ? 2 2 L ? 1 ? ? ? dL ? 1 2 dL ? ?i 2 ? L ? ? d ? 2 d? ? ? W f ‘ ? i , ? ? ? 2 T? T? 12 i L ? 2 1 2 dL ? i 2 d? Force and Torque Force and Torque – Doubly Excited Rotating Actuator – Doubly Excited Rotating Actuator (Cont. If a second winding is placed on the rotor, the singly excited actuator becomes a doubly excited actuator. The general principle for force and torque calculation discussed here is equally applicable to multi-excited systems. The differential energy and coenergy functions can be derived as dW f ? dWe ? dWm where dWe ? e1i1dt ? e2 i2 dt , e1 ? d? 1 dt , e2 ? d ? 2 dt , and dWm ? Td ? Hence, dW f 1 , ? 2 , ? ? ? i1d ? 1 ? i2 d ? 2 ? Td ? ? and ? W f 1 , ? 2 , ? ? ? W f 1 , ? 2 , ? ? ? W f 1 , ? 2 , ? ? d ? 1 ? d ? 2 ? d? 1 2 ? ? dW f ‘ ? i1 , i 2 , ? ? ? d i1 ? 1 ? i 2 ? 2 ? W f ? 1 , ? 2 , ? ? ? ?1 di1 ? ?2 di 2 ? T d ? ? ? W f ‘ ? i1 , i 2 , ? ? Therefore, T ? i1 di1 ? ? W f ‘ ? i1 , i 2 , ? ? ?Wf 1 , ? 2 , ? ? ? i2 or di 2 ? T? ? W f ‘ ? i1 , i 2 , ? ? Force and Torque – Doubly Excited Rotating Actuator (Cont. ) – Example 3 ? ? L? 1 For magnetically linear systems, ? ? 1 ? ? L11 ? ? ? L ? 2? ? 21 L 1 2 ? ? i1 ? L 22 ? ?i2 ? ? ? i1 ? ? ? 11 ?i ? ? ? ? ? 2? ? 21 or ? 1 2 ? ? ? 1 ? ? 22 ? ? ? 2 ? ? The magnetic energy and coenergy can then be expressed as W f ? ?1 , ? 2 , ? ? ? Therefore, d? ? W f ‘ ? i1 , i2 , ? ? Force and Torque and 1 1 2 ? 1 1 ? 12 ? 2 2 ? 2 ? ? 1 2 ? 1 ? 2 2 2 W f ‘ ? i 1 , i 2 , ? 1 1 L 1 1 i 12 ? L i 2 ? L 1 2 i1i 2 2 2 22 2 ? W f ‘ ? i 1 , i 2 , ? ? 1 2 d L 1 1 ? 1 2 d L 2 2 ? d L 1 2 ? ? i1 ? i2 ? i1i 2 2 2 T ?W f 1 , ? 2 , ? ? ? A magnetically-linear doubly-fed electromechanical actuator has two windings and a mechanical output with spatial rotary displacement ?. The self and mutual inductances of the windings are respectively L11 ? ? 5 ? cos(2? ) mH, L22 ? ? 50 ? 10 cos(2? ) mH, and L12 ? ? L21 ? ? 100 cos? mH. Brushless doubly-fed machine The first winding is supplied with i1 = 1. A while the second winding draws i2 = 20 mA. Determine: a) The general electromagnetic torque of the actuator as a function of ? . b) The maximum torque that the actuator can develop. Solution to Example 3 (a) Solution to Example 3 (cont. ) The  energy  stored  at  the  doubly? fed  actuator  is, 1 1 2 2 W f ? L11i1 ? L12 i1i2 ? L22 i2 2 2 1 1 ?3 2 ?3 2 ? (5 ? cos 2? ) ? 10 i1 ? (0. 1cos? )i1i2 ? (50 ? 10 cos 2? ) ? 10 i2 2 2 The  ex pression  of  electromagnetic  torque  is  obtained  as  follows:   ? ?W f (i1 , i2 ,? ) T ? i1 ? 1. 5, i2 ? 0. 02 ? 2 2 1 ? (i1 L11 ) ? (i1i2 L12 ) 1 ? (i2 L22 ) ? ? ? 2 2 1 1 (1. 5) 2 ( ? 2 sin 2? ) ? 10 ? 3 ? (1. 5)(0. 02)(? 0. 1sin ? ) ? (0. 02) 2 ( ? 20 sin 2? ) ? 10 ? 3 2 2 ?3 ? ? ( 2. 25 sin 2? ? 3 sin ? ) ? 10 Why Magnetic Field? Ratio of Electric and Magnetic Energy Densities in the air gap we ? 0 ? 0 E 2 1 ? ? wm B2 3. 6 ? 10 5 †¢ Saturation Flux Density Bs = 2T in commonlyused magnetic materials †¢ Air breakdown voltage Ebd=1,000,000 V/m b) At  maximum  torque, dT ?0 d? Differentiating  T  from  part  (a), 4. 5 cos 2? ? 3 cos ? ? 0 ? 1. 5 cos 2? ? cos ? ? 0 or               1. 5( 2 cos 2 ? ? 1) ? cos? ? 0 Solving  for  ? by  the  quadratic  formula, ?  =  55. 94 °Ã‚  and  153. 25 °Ã‚  (extraneous)Substituting  the  value  of  ? into  the  torque  expression  yields, T(max) ? ?(2. 25 s in 2(55. 94) ? 3 sin(55. 94)) ? 10 ? 3 ? ?4. 57 ? 10 ? 3 Nm Electric Machines †¢ Electric motor converts electrical energy into mechanical motion. †¢ The reverse task, that of converting mechanical motion into electrical energy, is accomplished by a generator or dynamo. †¢ In many cases the two devices differ only in their application and minor construction details, and some applications use a single device to fill both roles. For example, traction motors used on locomotive often perform both tasks if the locomotive is equipped with ynamic brakes. Introduction Electric Motors Electric Machine Insulation Class DC Motors Universal (DC/AC) AC Motors †¢ Induction †¢ Synchronous Stepping Motors Brushless DC Motors Coreless DC Motors Linear Motors MEMS Nano Motors †¢ A critical factor in the reduced life of electrical equipment is heat. The type of insulation used in a motor depends on the operating temperature that the motor will experience. †¢ Average insulation life decreases rapidly with increases in motor internal operating temperatures. †¢ Electric motor converts electrical energy into mechanical motion: Lorentz force on any wire when it is onducting electricity while contained within a magnetic field †¢ Rotor: rotating part †¢ Stator: stationary part †¢ Armature: part of the motor across which the voltage is supplied MaglevMagnetic Levitation Three phase AC induction motors rated 1 Hp (750 W) and 25 W with small motors from CD player, toy and CD/DVD drive reader head traverse DC Generators / Dynamos AC Generators / Alternators As the first electrical generator capable of delivering power for industry, the dynamo uses electromagnetic principles to convert mechanical rotation into a pulsing direct electric current through the use of a commutator.Without a commutator, the dynamo is an example of an alternator, which is a synchronous singly-fed generator. With an electromechanical commutator, the dynamo is a classical direct current (DC) generator. The DC generator can operate at any speed within mechanical limits but always outputs a direct current waveform. Mechanical energy is used to rotate the coil (N turns, area A) at uniform angular velocity ? in the magnetic field B, it will produce a sinusoidal emf in the coil: Permanent Magnet DC Generators d? d ? ? ( NBA cos ? ) dt dt ? NBA? sin ? t e(t ) ? ? http://micro. magnet. fsu. edu/electromag/java/generator/dc. tml Automotive alternator Rotor emf and current are induced by rotating magnetic field http://micro. magnet. fsu. edu/electromag/java/generator/ac. html Mechanical Components Mechanical Components – Mass and Inertia The mechanical component which stores kinetic energy is a mass in a translational system, and a moment of inertia in a rotational system. – Mass and Inertia (Cont. ) The kinetic energy stored by a mass moving at a velocity v, or a moment of inertia rotating at an angular speed ?. can be calculated by ? x M T F J Wk ? 1 Mv2 2 d? d 2? T? J 2 ? J dt dt dv d 2x F? M ?M dt 2 dt 1 J? 2 2 (translational system) rotational system) Comparing with the relationships of voltage, current, and magnetic energy in an inductor: V? L By the Newton’s second law, we have Wk ? or di dt and WL ? 1 Li2 2 we may regard a mass or a moment of inertia as an inductor which stores magnetic energy, if we let J? L M? L or Mechanical Components Mechanical Components – Springs An ideal spring is a device with negligible mass and mechanical losses, whose deformation is a single-valued function of the applied force or torque. A linear ideal spring has deformation proportional to force or ? 1 torque. – Springs (Cont. ) For a given distortion of x and ? the potential energy stored in a spring is 1 1 W p ? ? Td ? ? K ? 2 W p ? ? Fdx ? Kx 2 T x1 F ? K ? x 1 ? x o ? ? Kx (linear spring) (torsional spring) Comparing with the relationships of electric charge, voltage and electric energy in a capacito r: Q V? C F 2 2 WC ? and 1 1 Q2 VQ ? 2 2C we may regard a spring as an electric capacitor which stores electric potential energy, if we let T ? K 1 ? ?o ? ? K ? K? 1 C Friction Friction Modelling Friction: force that opposes the relative motion or tendency of such motion of two surfaces in contact. Friction between the two objects converts kinetic energy into heat.Coefficient of friction (Frictional coefficient): dimensionless scalar value which describes the ratio of the force of friction between two bodies and the force pressing them together, needs not be less than 1 – under good conditions, a tire on concrete may have a coefficient of friction of 1. 7. Static friction (stiction) occurs when the two objects are not moving relative to each other: Rolling friction occuring when one object â€Å"rolls† on another (like a car's wheels on the ground), is stiction as the patch of the tire in contact with the ground, at any point while the tire spins, is stationary relati ve to the ground.Kinetic (or dynamic) friction occurs when two objects are moving relative to each other and rub together: – Sliding friction is when two objects are rubbing against each other. – Fluid friction is the friction between a solid object as it moves through a liquid or a gas. The drag of air on an airplane or of water on a swimmer are two examples of fluid friction. Lu-Gre Model (1995): ? 0 , ? 1 bristles’ stiffness and damping coefficient ?2 viscous friction FC , F S Coulomb and Stribeck friction ? F f ? ? 0 z ? ? 1z ? ? 2v ? z? v? v z g (v ) 2 1 g (v ) ? [ FC ? ( F S ? FC ) e ? v / v S ) ] ?0 Mechanical Components Mechanical Components – Damper The mechanical damper is analogous to electrical resistor in that it dissipates energy as heat. An ideal damper is a device that exhibits no mass or spring effect and exerts a force that is a function of the relative velocity between its two parts. A linear ideal damper has a force proportional to the relative velocity. In all cases a damper produces a force that opposes the relative motion of the two parts. Mechanical friction occurs in a variety of situations under many different physical conditions.Sometimes friction is unwanted but must be tolerated and accounted for analytically, as, for example, in bearings, sliding electrical contacts, and the aerodynamic drag on a moving body. In other cases friction is desired and is designed into equipment. Examples are vibration dampers and shock absorbers. d ? x2 ? x1 ? dt dx ?B dt F? B ? B? R d 2 ? ?1 ? dt d? ?B dt T? B – Damper (Cont. ) Mechanical Components Mechanical Components – Damper (Cont. ) The damping due to Coulomb friction, as shown by the characteristic, can be regarded as a nonlinear resistor, which can keep the voltage across it to be constant.The Coulomb friction force can be expressed as – Damper (Cont. ) There is another kind of damping caused by the drag of a viscous fluid in turbulent flow. 2 F ? ? Bs d x2 ? x1 dt F ? ?d Fn ? ? d Fn d ? x2 ? x1 ? dt ? ? ? Bs dx dt d ? x2 ? x1 ? dt ? 2 ? R ? B s dx dt dx dt ? dx dt or T ? ? Bs d 2 ? ?1 ? dt Comparing with V=RI, we may conclude that ?F R? d n dx dt ? ? ? Bs d? dt ? ? 2 2 ? R ? B s d ? dt MR Dampers as a semi-active device MR Damper New Models Non-symmetrical Model (2007) ? F ( x) ? c0 x ? ko ( x ? x0 ) ? ?z ? ? ? z ? (? ? ( ? ? ? sign( zx) z ) x n : hysteresis variable, ? , ? , ? , ? , n, c0 , k0 : model parameters Bouc-Wen Model: ? F ( x ) ? c0 x ? k o ( x ? x0 ) ? ? z ? ? ? ? z ? ? ? z | x || z | n ? 1 ? ? x | z | n ? ? x z: hysteresis variable , ? , ? , ? , ? , n , c 0 , k 0 : model parameters Static Hysteresis Model (2006) ? F ( x) ? cx ? kx ? ?z ? f 0 ? z ? tanh( ? x ? sign( x)) z : hysteresis variable, ? , ? , f 0 , c, k : model parameters Minimally-Parameterised Model (2007) ? F : G ( x ) ? D ( x ), F ( x) ? ? 1 ? F2 : G ( x ) ? D ( x ), b G ( x) ? a ? ? 1 ? exp ( cx ) ? D ( x ) ? rexp{? ( x / 2? ) 2 } ? 0 x ? 0, x

Beowulf Essay

Beowulf Essay Beowulf Essay Picking up the Pieces What is a nation to do when everything they stand for is gone? This is the unfolding story in the poem Beowulf. Beowulf is a Geat warrior who sacrifices his own safety to battle the evil that presents itself against the Danes in the form of the fierce monster Grendel. King Hrothgar and the Danes exemplify pride, happiness, and power before Grendel steals everything from them when he attacks what is dearest to King Hrothgar's heart: Herot, the glorious palace built for celebration. Once Grendel makes his initial appearance, it takes a miracle to bring celebration back into the hearts of the Danes. Before Grendel begins his reign of terror, Herot is a place of pride. People everywhere can see its beauty and stature as it reaches â€Å"higher toward Heaven than anything that had ever been known to the sons of men" (Beowulf 25). With golden pillars and remarkable architecture, Herot symbolizes hope and joy. Shame replaces pride when the Danes cannot stand ag ainst Grendel. This horrifying monster overpowers the Danes on every front. Nothing they can do will stop Grendel and his vindictive nature. Beowulf's journey begins here when he does something no mortal man can do; he defeats Grendel. By the grace of God, Beowulf restores the Danes' pride and then some. A characteristic of a hero is humility and Beowulf does not possess this trait in the slightest. Though this seems negative, it benefits the Danes as Beowulf's conceit brings pride back to these countrymen. Grendel may have originally stole away their pride, but Beowulf brings it back. Herot used to be the epitome of happiness and joy. Anybody who came near to Herot instantly became blanketed by peace because supposedly nothing could ever harm it. That is until Grendel decides to intercede. Grendel hears the happiness and euphoria erupting from Herot while in his cave. Jealousy ensues and he can no longer stand hearing the joy when he is miserable and alone. Instead of c reating his own happiness, Grendel steals the Danes’. By Grendel killing people and stealing their bodies, Herot becomes a house of sorrow. When Grendel is finally defeated, the Danes rejoice for Beowulf has come through triumphant. In all this happiness, though, there is still someone who the joy cannot touch. Grendel’s mother is heartbroken over the death of her son and she is seeking vengeance. As Grendel did before, his mother takes the life of a noble soldier, snatching away the happiness just as it is returned. Beowulf dives back into a fierce battle that goes back and forth until the brave warrior is able to win the battle, but he does not do it for the Danes’ per se. During a time when Beowulf is struggling, the poet writes â€Å"but Beowulf longed only for fame, leaped back into battle† (Beowulf 71). Even though Beowulf yearns only for the notoriety of the victory, this minor indiscretion does not faze the Danes’ as they are the o nes benefitting. The joy is returned and they are finally jubilant again. Having power is something the Danes and many others respect. Not only do they respect it, they deem power a necessity. Without it, others will assume they can obliterate and overthrow the Danes with ease. The Danes grew accustomed to putting angst into the eyes of those around them, but Grendel changed that by putting dread into theirs. Power is transferred through the

Facts About Eohippus

Facts About Eohippus In paleontology, correctly naming a new genus of extinct animal can often be a long, tortured affair. Eohippus, aka Hyracotherium, is a good case study: this prehistoric horse was first described by the famous 19th-century paleontologist Richard Owen, who mistook it for an ancestor of the hyrax (hence the name he bestowed on it in 1876, Greek for hyrax-like mammal). A few decades later, another eminent paleontologist, Othniel C. Marsh, gave a similar skeleton discovered in North America the more memorable name Eohippus (dawn horse). Since for a long time Hyracotherium and Eohippus were considered to be identical, the rules of paleontology dictated that we call this mammal by its original name, the one bestowed by Owen. Never mind that Eohippus was the name used in countless encyclopedias, childrens books, and TV shows. Now, the weight of opinion is that Hyracotherium and Eohippus were closely related, but not quite identical, the result is that its once again kosher to refer to the American specimen, at least, as Eohippus. Amusingly, the late evolutionary scientist Stephen Jay Gould railed against the depiction of Eohippus in the popular media as a fox-sized mammal, when in fact it was the size of a deer. An Ancestor of Modern Horses Theres a similar amount of confusion about whether Eohippus and/or Hyracotherium actually deserve to be called the first horse. When you go back in the fossil record 50 million years or so, it can be difficult, verging on impossible, to identify the ancestral forms of any given extant species. Today, most paleontologists classify Hyracotherium as a palaeothere, that is, a perissodactyl (odd-toed ungulate) ancestral to both horses and the giant plant-eating mammals known as brontotheres (typified by Brontotherium, the thunder beast). Its close cousin Eohippus, on the other hand, seems to deserve a place more firmly in the equid than the palaeothere family tree, though of course, this is still up for debate! Whatever you choose to call it, Eohippus was clearly at least partly ancestral to all modern-day horses, as well as to the numerous species of prehistoric horse (like Epihippus and Merychippus) that roamed the North American and Eurasian plains of the Tertiary and Quaternary periods. As with many such evolutionary precursors, Eohippus didnt look much like a horse, with its slender, deerlike, 50-pound body and three- and four-toed feet; also, to judge by the shape of its teeth, Eohippus munched on low-lying leaves rather than grass. (In the early Eocene epoch, when Eohippus lived, grasses had yet to spread across the North American plains, which spurred the evolution of grass-eating equids.) Facts About Eohippus Eohippus (Greek for dawn horse), pronounced EE-oh-HIP-us; also known as Hyracotherium (Greek for hyrax-like beast), pronounced HIGH-rack-oh-THEE-ree-um Habitat: Woodlands of North America and Western Europe Historical Epoch: Early-Middle Eocene (55-45 million years ago) Size and Weight: About two feet high and 50 pounds Diet: Plants Distinguishing Characteristics: Small size; four-toed front and three-toed back feet

BlackBerry - Report Essay Example | Topics and Well Written Essays - 3500 words

BlackBerry - Report - Essay Example In 2010, it had a market share of 43% in the United States of the American market. However, in the recent years, the market share of the company has dramatically faced a precipitous decline. The steep decline has been due to the intense competition from the Google’s Android and Apple’s iPhones. For this reason, the blackberry company’s market share in the United States personal consumer market only, was trimmed down to 3.8% in the year 2013. However, on other markets other than the United States private consumer market, the products have had a healthy market trend. In September, the same year, the company authenticated an intent letter to be acquired by the United States ($4.7 billion or US $9 per share). It was through a consortium led by Fairfax Financial that then announced its plan to take the company private. Later on November 4, of the same year, the deal was wiped in favor of US $1 billion. At the moment, the majority of the remaining value of the company lies in innovation. A number of different factors influence the company’s competitive position. However, the company’s greatest challenge in the coming months or years will be to prove to business and consumers that they can match the current Android, Apple and the coming up Microsoft juggernauts that seem to be evading into the distance ahead with their consumers. Reports by Marukawa (2010) detail that in the past months, Blackberry smartphones have gone from being the once dominant smartphones in the market to becoming marginal player in most markets. It has resulted to the company suffering significant losses. The company is losing out to the current iPhone and android mobile handsets. Blackberry launched its tablet, and the Blackberry playbook a year after the iPad, first generation. To blackberry, this was one of the moments that proved to be extremely disastrous. The playbook did not sell as

Alternative perspectives of international political economy 1 Essay

Alternative perspectives of international political economy 1 - Essay Example The ultimate generalization that exists within the rational choice model is that the individual or collective will make a choice based upon that which maximizes their overall best interests. However, the authors point to the fact that the rational choice model presents a noted difficulty in the fact that it raises the question of who and what defines the â€Å"public†. Whether or not there is indeed a concerted voice, even within a democratic system is an issue that directly concerns the means through which the rational choice model can be applicable to IPE. The authors reference the case in point of corrupt elected officials acting â€Å"rationally† by accepting bribes and payouts; however, even though this is true with some, the rational choice model inherently breaks down over such mores and norms of character that are exhibited by others who refuse such bribes and payouts. Ultimately what is rational choice for one is not for another; thereby calling into question t he degree and extent to which this can or should be used to define IPE. Constructivism Constructivist theory is introduced as a â€Å"deconstruction† of existing factors. ... ssumptions of constructivist theory, with respect to IPE, can be summarized in the following: 1) ideas, beliefs, values, and identities of individuals and groups are the key to understanding IPE 2) ideas, values, beliefs, and identities are socially constructed 3) ideas, values, etc., are social forces that are more important than military or economic factors 4) conflict and cooperation are products of values and beliefs 5) change can be explained by examining changes in the values and beliefs of individuals and other actors over time. Feminist Critique Within the feminist critique, the authors argue for the fact that IPE is predicated upon the norms, mores of gender roles, stereotypes, patriarchy etc. Moreover, overlooked aspects of IPE are due to the fact that the pervasive sexism has sidelined women over the decades. As such, a focus upon gender, loaded language, subtexts, male dominance of not only society but economic studies especially economics is oftentimes engaged. This is a broad based dynamic that is not succinct and can easily be transitioned to apply in a great litany of different situations. Ultimately, the dynamic through which the decisions of IPE have taken place since the dawn of time have in fact been dominated by men and by a patriarchal sense of sexism. As such, it is perhaps this one approach, of all the others that have been engaged, that has the most to offer with regards to approaching seemingly old issues from a fresh perspective and gaining new insight into them. Hegemonic stability theory Hegemonic stability theory can roughly be defined as the understanding that a given power, invariably rich and powerful, dominates other states for a length of time; instituting norms, expectations, and ultimately collapsing under its own weight. Such a

Discussion topic Essay Example | Topics and Well Written Essays - 250 words

Discussion topic - Essay Example Thus, it would be justified to say that Casey Martin should have been allowed to use the cart in the PGA tours but justice was sacrificed by denying Casey the freedom to use his cart at the expense of the golf fraternity that would have been affected by the golfers’ action. Indeed, the decision that was taken could also be defended on the basis that he was a physically challenged golfer and allowing him to use a cart could affect the outlook of the game. Thus, one may argue that justice may have been used accurately granted because the decision was reliant upon matching equal entities and equal people. All these give the impression that theory of distributive justice perpetuates impartial justice. One can explain justice in theoretical aspects by viewing it behind a curtain of ignorance, which means that our personalities, class, moral characters, luxuries and talents are not exposed. It is agreeable that justice was purposed at giving people what they deserve. However, as discussed, it does not give everyone what is

Temperature change for CaCO3 and HCI

Temperature change for CaCO3 and HCI Research questions: When the temperature is digressed, or increased will the CaCO3 and HCI have a faster reaction? What happens when the reaction is happening? What happens when Caco3 and HCI meet each other? Answers: When calcium carbonate is heated it first reacts to the acid then after a while it turns CaCO3 into calcium Hydroxide. Its formed when ions bonds react to the acid which makes electric charge so it heats up. When CaCO3 and HCI reacts, it forms calcium chloride, water and carbon dioxide. The reaction between both compounds requires two parts HCI and CaCO3. The reaction is rapid and energetic at high concentrations. Large part due high affinity of calcium ions for chloride ions Depending on the temperature when Calcium chloride and Hydrochloric acid meet. Its charges start moving rapidly and a reaction will start to begin much faster. Both charges combine for a reaction to occur. Background info: The topic we have chosen is how temperature can change   calcium carbonate and hydrochloric acid In different temperature like the normal temperature cold and hot. (dont know the science behind it yet) A reaction rate is the speed on how fast or slow the chemical reaction proceeds It is often said in terms of either concentration the amount of unit volume of a product that is formed in a unit of time.   When you increase the temperature, the particles speed up a lot but when you cool them down they get slower.   when its heated there is a faster reaction rate but when temperature is lowered, the reactions takes a lot longer cause the particles dont have a lot of energy has they would when heated. The collision theory is for ta chemical reaction to occur the reactant particles must collide together. Collisons with too little energy do not produce a reaction. It must have enough collisions to the energy can make the particles react. (still got to add research) The experiment the team is doing is testing what temperature change does to calcium carbonate and hydrochloric acid. The way my research questions are going to help with the experiment is the ones I have are what we are manly looking for like. How long it takes for a reaction to occur, will the temperature change the original element. (forgot what my third was) they are what we manly are curious of and trying to find. (using photos as diagrams if I can) The chemical equation for calcium carbonate and hydrochloric acid is CaCO3+HCI-CaCI2+CO2+H20 Aim: The aim of the experiment is to exam if temperature changes the rate of reaction for CaCO3 and HCI for cold, hot and medium temperature. Hypothesis: It is hypothesised that when CaCO3 meets HCI it will react faster depending of the temperature. If the temperature is hotter it will have more energy cause its warm but if its colder they will react much slower cause they have a cold and have less energy. Its like real life people when cold we dont want to do anything but hot we want to do lots. When its medium temperature it will have a medium reaction rate. Equipment list: Beakers (x3) Thermometer Hot plate Ice cream bucket with ice Measuring tube Stop watches (x3) Calcium carbonate (3 grams) Scales Hydrochloric acid (144m total) Safety glasses Apron Gloves Method: Throughout the experiment everyone was required to wear the following safety gear glasses, apron and gloves. For the experiment after the group put all the Safety gear on the bench and on them. they moved on to grabbing the equipment then moving it slowly and carefully to the work bench. Once everything was out on the bench ready then the group grabbed the Calcium carbonate(CaCO3) and hydrochloric acid (HCI) then measured out the right amount for both scales were used for the CaCO3 and measuring tube for the HCI. After the HCI was poured into the beaker it was put in bucket full of ice or on a hotplate then the calcium went in. After five minutes of the hot plate or ice been in the bucket check the temp also make sure you remember the reaction rate time. After the experiment is complete pack up and clean the equipment then return all of it. Make sure you let the hotplates cool down before touching them. Experiment diagram: Risk table: Possible risks Solutions Glass break Get a dust pan and brush then put the glass in the hazard box also warn others about the glass Chemical spill on you If in eyes wash for a couple of mins at the eye wash but if on skin wash it off straight away at the sink or the shower Tripping Make sure all chairs and charger cords are not on the ground also make sure shoe lace is done up Hot plate Dont touch if hot wait for it to cool down Ingestion Dont swallow the chemicals Breathing in the chemical Dont sniff or purposely breath in the chemical Temperature results for CaCO3 and HCI: Calcium carbonate and hydrochloric acid temp change Temp before combining the two elements Temp after (checked (degrees) Time for the reaction to occur and finish (start of reaction -finish of reaction) 1 cold 5 5 30 seconds 1 Medium 24 25 14 seconds 1 hot 45 47 7 seconds 2 cold 5 5 32seconds 2 medium 24 25 14 seconds 2 hot 45 46 8 Seconds Observations: When the calcium carbonate and hydrochloric acid was put together for the cold test it triggered a reaction straight away a lot of bumbles built up and punched to the top almost going over the top of the beaker. All the calcium was all gone except some tiny parts for the normal temperature test it did the same put after the calcium started to dissolve. Discussion: In the test, there was some patterns that we saw for the results such as cold temp had a slow reaction at the end but it was a bit fast at start cause the water around the beaker was still getting colder the temperature stayed the same. A reaction for cold lasted for around 20-25 seconds. For the medium test, it started at a temp of 24 for both and only increased by one, a reaction started and ended in about 10-15 seconds. Hot was a lot different with a starting temperature of 45 and increased to 47 the reaction happened rapidly in about 5 seconds for it to start and end. The information I collected was accurate about what would happen and thats what happened in the test. It said hot temperature reaction is faster because it has a lot more energy in it but when cold and medium the temperature is much slower especially for the cold. Some parts of the research werent fully accurate but some of it was. My hypothesis was supported for this experiment I did predict that the hotter the faster reaction but cold has a much more slower reaction. Hot warms up everything giving it a lot more energy to do stuff so when it reaches a curtain heat a reaction will start. Cold has a slower reaction because it has a cold just like humans when we get a cold we have no energy at all and just cant do anything. The this could be used is finding out the right temperature to use to craft medals or just products in general or to test for whats the right temperature for plants and stuff to grow. Evaluation: The experiment went well at the start and all through except for a couple of miss calculation with our choice of measuring. There was a bit to much HCI added to test when we should have had less of it, when they elements combined it almost overflowed out of the beaker. But in the last test everything still ended up as the same results and finished with no drama. The team did well but sometimes one member kept touching and ruining what we just fixed up. A couple of things that could be improved is the team work and making sure we do our calculations right so the beaker doesnt almost overflow. Conclusion: The full experiment went mostly perfect but it was solved in the end. Evan that we have some bad teamwork and miss calculations we got it done. Our results were normal and weird the reaction went fantastic as well did the time. Our calculations were a bit off with a bit too much but all solved in the end. Things that could be improved next time is the team work. Its the key part for a perfect experiment. Some things that went fantastic would have to of been the time we go each one down and the perfect times and temperatures. If all the bad part were gone it would have been the perfect test. Reference list: Pearson science text book https://www.reference.com/science/calcium-carbonate-s-reaction-hydrochloric-acid-332b0b7065612e18 http://www.answers.com/Q/What_happens_if_Calcium_Carbonate_is_added_to_hydrochloric_acid?#slide=6 YouTube Class notes Had other websites but forgot what they were