Joel-Peter Witkin :: essays research papers

A partir des annà ©es 1970 qui marquent la fin de l’à ¢ge d’or du photojournalisme, de nombreux photographes, qu’ils soient autodidactes ou qu’ils aient bà ©nà ©ficià © d’une formation spà ©cialisà ©e, examinent, assimilent et s’imprà ¨gnent tellement des recherches et des rà ©ussites de leurs prà ©dà ©cesseurs qu’ils les incorporent d’une faà §on ou d’une autre dans leur propre crà ©ation. Joel-Peter Witkin, qui a visità © les musà ©es depuis son adolescence et qui a à ©tudià © l’histoire de la photographie à   l’Università © du Nouveau-Mexique, est certainement l’une des figures les plus emblà ©matiques de ces gà ©nà ©rations d’aprà ¨s la Deuxià ¨me Guerre mondiale qui reconnaissent leurs hà ©ritages et leurs filiations. Certes, il est nà © en 1939, mais depuis qu’il rà ©alise les tableaux photographiques qui lui ont dà ©jà   assurà © une renommà ©e inte rnationale, il se rà ©fà ¨re rà ©gulià ¨rement aux peintres (Archimboldo, Rubens, Goya, Và ©lasquez, Courbet, etc.) et aux photographes (Mayer et Pierson, Fenton, Marey, Weegee, Horst, Man Ray, etc.) dont il apprà ©cie la contribution à   l’histoire de l’art. Comme ses pairs, il sait que l’art ne naà ®t pas de rien et qu’il se nourrit autant des idà ©es et des formes qu’il a dà ©jà   engendrà ©es, que des composantes de la socià ©tà ©, religieuses, politiques, à ©conomiques, sociales, techniques et autres. De mà ªme qu’il intà ¨gre dans son travail photographique, sans tricher, ses propres aspirations, sa propre quà ªte, Witkin assume ses sources d’inspiration et il rend rà ©gulià ¨rement hommage à   ceux qui participent, tant spirituellement que plastiquement, à   la genà ¨se de ses Å“uvres. L’exposition Joel-Peter Witkin, disciple et maà ®tre à ©claire le dialogue continu que le dà ©miurge entretient depuis vingt ans avec l’histoire de la photographie. A la fois poussà © par ses pulsions et impressionnà © par le â€Å"pouvoir du rà ©el† que la photographie peut reproduire, Witkin se sert de rà ©fà ©rences, à ©tablit des connivences, rà ©gà ©nà ¨re des Å“uvres qu’il affectionne et quelquefois, au prix d’une mue, les prolonge. Elles l’aident à   donner à   ses visions la force impà ©rieuse qu’elles requià ¨rent. Il trouve dans le patrimoine photographique des racines, des ferments, des repà ¨res, des suggestions qui alimentent son rapport au rà ©el et son rapport à   l’art. L’exposition permet d’apprà ©cier vingt-six Å“uvres de Witkin qu’il a lui-mà ªme mises en regard de photographies d’auteurs tels que Lewis Carroll, Fred Holland Day, Diane Arbus et Brassaà ¯.

How Cleanliness Can Influence Life of Kazi Zawad Badruddoza

Whereas the cleanliness is relate well to the aspects in our life. There is some reason why cleanliness is important to our life. Cleanliness influences our health, controlling our mood and then keeps the relationship with our friends. The clothes and the pants which we wear must be clean so that no more germs that can affect allergy like irritation. The food and the drink which we consume must be clean from microbes to prevent risk of illness like stomach ache, diarrhoea and many more.Then, the objects around us it should be clean from dust so we not experience the respiration illness. With kept our cleanliness so that our life must be healthy. Another reason we must watch cleanliness because the cleanliness can controlling our mood. Cleanliness makes us feel fresh and comfortable. A clean room makes us feel freshness because all of the objects are clean and free of dust so that the air is fresh. Its floor is clean so there are no bacteria or microbes and we can do the activities wi thout worried about hygiene problem.Cleanliness can be regarded as personal or environmental. These habits ensure that a person would stay fit and healthy for a long time so you will not be force to use those anti aging treatments or some sort of surgery. These habits help us in developing an ideal and healthy life style which makes our lives even more delightful and joyous. Lesser effort would result in more success if a person has healthy mind and a healthy mind can only exist in a healthyCleanliness is one of the good qualities. It is a part of our civilization. A man of dirty habits is far from civilization. So, with the progress of civilization man cleans himself more and more. He cleans his body. He cleans his mind and heart. He cleans all his action and manners. He cleans his soul. This will lead him to the highest form of civilization. But on the cleanliness of body, depend all other cleanings. Hence, cleanliness is considered so important.

Essay on the the Secret Book Essay

According to recent studies, self-help books – non-fiction books that offer advice for behavior modification and make explicit promises for positive change – have doubled as a percentage of all book titles since the 1970s. The increasing popularity of self-help books is an indicator of the modern society’s quest to maximize personal happiness through a process of self-discovery. Self-help books are a response to a real and genuine hunger for psychological understanding and self-improvement and are part of the larger market of advice media. Readers buy self-help books seeking self-control – both as a good-faith attempt to increase their self-control and to elicit a temporary sensation that, in fact, the first step toward self-control has already been taken. And of recent years, one of the increasing self-help or spirituality books involve the teachings of New Age-ism. The New Age is a decentralized Western social and spiritual movement that seeks â€Å"Universal Truth† and the attainment of the highest individual human potential. It includes aspects of Occultism, astrology, esotericism, metaphysics, alternative medicine, music, collectivism, sustainability, and nature. New Age spirituality is characterized by an individual approach to spiritual practices and philosophies, and the rejection of religious doctrine and dogma. New Age practices and philosophies sometimes draw inspiration from major world religions: Buddhism, Chinese folk religion, Christianity, Hinduism, Islam, Judaism; with particularly strong influences from East Asian religions, Gnosticism, Neopaganism, New Thought, Spiritualism, Theosophy, Universalism, and Western esotericism. New Age spirituality has led to a wide array of literature on the subject and an active niche market: books, music, crafts, and services in alternative medicine are available at New Age stores, fairs, and festivals. And one of the most phenomenal publishing successes in the self-help/New Age teachings is a book called The Secret. ABOUT THE SECRET Product Details The English-language 6. 9 x 5. 7 x 0. 9 inches hardcover book is fairly lightweight at 198 pages. It was first published in November 28, 2006 by Atria Books in Australia. In the United States of America, the book is published by Beyond Words and in United Kingdom by Simon & Schuster UK. Product Description Fragments of a Great Secret have been found in the oral traditions, in literature, in religions and philosophies throughout the centuries. For the first time, all the pieces of The Secret come together in an incredible revelation that will be life-transforming for all who experience it. In this book, you’ll learn how to use The Secret in every aspect of your life — money, health, relationships, happiness, and in every interaction you have in the world. You’ll begin to understand the hidden, untapped power that’s within you, and this revelation can bring joy to every aspect of your life. The Secret contains wisdom from modern-day teachers — men and women who have used it to achieve health, wealth, and happiness. By applying the knowledge of The Secret, they bring to light compelling stories of eradicating disease, acquiring massive wealth, overcoming obstacles, and achieving what many would regard as impossible. Content of The Secret 1. Foreword 2. Acknowledgements 3. The Secret Revealed 4. The Secret Made Simple 5. How to Use The Secret 6. Powerful Processes 7. The Secret to Money 8. The Secret to Relationships 9. The Secret to Health 10. The Secret to the World 11. The Secret to You 12. The Secret to Life 13. Biographies The Secret Revealed The first thing you need to know is that The Secret isn’t really a secret. The secret is actually â€Å"The Law of Attraction† that asserts what you think creates what you feel, and these feelings flow from your body as magnetic energy waves over vast distances, which then cause the universe around you to vibrate at the same energy level as your feelings. The idea dates back nearly 3,000 years to early Hindu teachings that â€Å"like attracts like. † The law of attraction, which the author Rhonda Byrne says is the most powerful law in the universe, states that people experience the logical manifestations of their predominant thoughts, feelings, and words. This gives people direct control over their lives. A person’s thoughts (whether conscious or unconscious) and feelings bring about corresponding positive or negative manifestations. Positive thoughts bring about positive manifestations while negative thoughts bring about negative manifestations. The theory is very simple. Because it is an absolute law, the law of attraction will always respond to your thoughts no matter what they are. Thus your thoughts become things. You are the most powerful power in the universe simply because whatever you think about will come to be. You shape the world that exists around you. You shape your own life and destiny through the power of your mind. To quote some of the teachings in this book are â€Å"Thoughts are sending out that magnetic signal that is drawing the parallel back to you. †Thus there is no such thing as accident or coincidence; it is you, the individual, who brings misery on yourself because of your toxic thinking. But the good news, if you can alter your thoughts, and therefore your feelings, you can actually cause the universe around you to vibrate at a positive energy level and the desires of your heart will come to be realized! All you have to do is Ask — Believe — Receive. You just have to visualize what you want, feel good about it, and then ask the universe — and whatever you can imagine can be yours. It is like having the universe as your catalogue and you flip through it and go, ‘Well I’d like to have this experience and I’d like to have that product and I’d like to have a person like that’ †¦ It is you just placing your order with the universe. The law of attraction was the power, the author argues, behind geniuses such as Plato, Newton, Beethoven and Einstein. In this book too, she has also gotten quotes, experiences and support from the who’s who of the self-help industry, including John Gray, author of â€Å"Men Are From Mars, Women Are From Venus,† and Jack Canfield, who wrote â€Å"Chicken Soup for the Soul. â€Å"Jack Canfield, provides an excellent example of the ask-believe-receive system where he tells us that he visualized earning $100,000 (even writing the desired amount on a bill worth far less and tacking it to the ceiling above his bed) and focused his mental energy only on the goal of attaining the money. He tells us that he had absolutely no idea how he was going to get the money — he simply focused on believing that he would get the money, somehow. But how? For four weeks he had no breakthrough ideas but then, one day in the shower, he remembered that he had written a book and, if it was published (particularly if he sold 400,000 copies and he made a quarter on each) he just might achieve his financial goals. Of course the book was published, and the results were only a few thousand dollars shy of 100,000 dollars. And this is just one of the many testimonials in this book called The Secret. The Story Behind The Secret It is not a secret now that The Secret is a publishing phenomenon of recent years especially for in the non-fiction & self-help category. This small book, with a parchment-brown cover engraved with the image of a red wax seal, debuted in 2006 and since then it has sold over four million copies worldwide and has been translated to 38 different languages. The Secret began as a DVD which came out end of 2004. Rhonda Byrne was a television producer in Australia in 2004 when the death of her father led her to discover ‘the secret’, which is her term for what is commonly known as the law of attraction. Her discovery was mainly caused by the 1910 book The Science of Getting Rich by Wallace Wattles. Wattles’s book struck such a chord with Byrne that she plunged into a crash course in Western, Eastern, ancient and modern thought, devouring hundreds of books and articles in just two and a half weeks. Inspired, she flew to the States in July 2005 and began lining up people to interview; the film was finished six months later and she began trying to find an Australian network to air it. The top-rated Nine Network was intrigued by her proposal, but the finished film struck Len Downs, the program manager, as just â€Å"a whole range of talking heads giving their basis of the secret of life. † It eventually ran in Australia just a few weeks ago, and, says Downs, it didn’t do all that well. But armed with the law of attraction, Byrne was confident things would work out. A Web company situated just blocks away from her office in Melbourne had a technology for distributing streaming video over the Internet. In March 2006, her site (http://thesecret. tv) began selling downloads and DVDs, one of which found its way to Cynthia Black, president of the New Age-oriented publishing house Beyond Words saw its potential and by late November the book was in the stores and the rest as they say, is history. PURCHASING THE SECRET The Secret books are available at all major bookstores, online bookstore and through its official website. It is usually placed in the Health, Mind & Body -> Self Help category or Religion & Spirituality -> New Age category. At most of these major bookstores, The Secret books are placed most prominently on the shelves. Due to it being constantly on worldwide bestseller lists for non-fiction books thus the title is prominently displayed in the bookstores should the bookstore have a bestsellers display section. Its average retails price for cash & carry stores are $23. 95 in the United States; ? 12. 00 in United Kingdom; and MYR79. 90 in Malaysia. While its average retail price for online purchases are $14. 00 and ? 12. 00 in United States and United Kingdom respectively. PROMOTING THE SECRET After the phenomenal success of the The Secret DVD, it made sense for it to be turned into a book and what better way for the marketers to embark on promoting the book than playing up the hype of the movie and using the popular internet marketing tool such as the viral video site YouTube. The book was marketed with an online viral video campaign focusing on wealth enhancement. The short video clips showed testimonials from readers of the book and practitioners of â€Å"the secret† claiming that the technique brought them wealth, cured sickness, and brought about a general life-change. The video clips do not disclose what â€Å"the secret† is, where it originated from or how it can be practiced, but rather pointed viewers to the website for both the book and film. Thus hooking the viewers and made them all the more intrigue by the claims made by the author in the book. As for packaging and promotional material, the book also played into the consumers’ senses by trying to showcase that â€Å"the secret† originates from the cosmos. The cover prominently displayed a parchment-brown cover engraved with the image of a red wax seal (see Appendix 1) to indicate it is somewhat a book from the olden days and in the inside pages, the background design are a field of stars, and various shots of the universe thus adding mystique to the claims and the practice. However, the most savvy and most probably the ultimate gambit of the book is to call it ‘The Secret. To quote Mr Donavin Bennes, a buyer who specializes in metaphysics for Borders Books, â€Å"We all want to be in on a secret. But to present it as the secret, that was brilliant. † Thus the name evoke a sense of intrigue to readers who are looking for something magical or perhaps easier tool for them to understand and to fully live their lives. Another smart marketing move made by the publisher was to have it endorsed by well-known and highly popular worldwide celebrities. The book got its first break in the US when Ellen DeGeneres featured it on her show. And when Oprah Winfrey decided to run a show on it, although it was already a big success, the sales ballooned up much more. Oprah Winfrey first featured it on Feb. 8 2007 and according to Nielsen BookScan, the book had sold 18,000 copies the week before. During the week of the show, sales rocketed to 101,000 and when the show did a follow-up on Feb. 16 2007, the sales that week reached 190,000. With the success of the book, the publishers decided to create more spin-off titles, which they call The Secret tools. There are now The Secret to Teen Power (see Appendix 2), The Secret Daily Teachings (see Appendix 3) and The Secret Gratitude Book (see Appendix 4). Not only that, at its official website there are also ‘gifts’ for the readers such as visualization tools, The Secret memory game, wallpapers, ebook and blank checks (see Appendix 5) which goes hand-in-hand with the teachings of the book. THE SECRET S. W. O. T ANALYSIS Strengths 1. The intriguing title. As elaborated above, the title play a major role in inciting readers’ interest in the book. 2. The cover design. Alongside its intriguing title, the odd-shaped book with its olden-days personification invoke a sense of mystery that is definitely eye-catching and surely pique a person’s interest while browsing the shelves at a bookstore. 3. The content is an easy read with its simple language and peppered with inspiring testimonials from many men & women who has experienced the use of the secret plus personal experience & quotations from the the who’s who of the self-help industry. 4. The savvy marketing ideas of the publishers that has created the hype that constantly raise awareness of the book. 5. Endorsement by high-profile & influential personalities that are recognized world-wide certainly helped boosted its sale internationally. 6. Constant high-placing in best-selling charts, most probably due to the savvy marketing ideas of the publisher and as the  long-term effect of the celebrity associated to the book especially Oprah Winfrey. Weaknesses 1. The selling price in Malaysia of RM79. 90 is definitely a setback to potential buyers as the price is rather steep for many people especially for books in the self-help category. 2. The book is not available in paperback form thus some book buyers are not keen on buying hardback cover books due to its steeper price or its slightly heavy weight. 3. The content is not something that is unique and there are many similar teachings that one can get in many other books thus it does lack a little originality. 4. As typical with many New Age teachings, the content of the book has garnered much criticism which try to debunked the book’s teaching as merely hype, mumbo-jumbo or just plain illogical. 5. The book has to complete with many other form of self-help books available that are cheaper, more accessible and from much more renowned authors (Paulo Coelho, Eckhart Tolle, Anthony Robbins) Opportunities 1. Publishers could promote to younger readers especially The Secret for Teens book first and therefore will garner their interest in the main book The Secret. 2. Use the The Secret movie to lure potential readers as there are those who would like to have to book in hand as a way to look back or do revision which is harder to do with the dvd. 3. Offer a cheaper paperback form, thus the book is able to be sold at a cheaper price and therefore garner many more readers. Threats 1. With the easy access to internet, potential readers might decide to check out what the book is about online and thus stumbling on the many critics that the book has garnered. This in turn can make them believe the critics before actually reading the book, thus will result in loss of sales. 2. Like many other things in life, people are apt to stumble upon a new idea for a book or a belief that could help the world, thus there will be brand new books in the future that will probably come with a much more savvy marketing approach and thus will affect the interest of the people about The Secret! THE SECRET CONCLUSION The Secret is a phenomenon and it is likely to become one of the best-selling self-help books of all time. Venture into your local bookstore or look around you while waiting at an airport, and you’re bound to see people reading it and absorbing it. They will not just be people who consult astrologers and who listen to Tony Robbins tapes, but normal, average people like the ones who live next door to you. There are almost 1400 reviews of the book printed at Amazon with an average rating of 3. 5 out of 5. The breakdown of those scores is interesting: fifty-two percent of them are 5-star, thirteen percent are 4-star and twenty-one percent are 1-star. This means that the majority of people, the great majority even, believe in at least some aspects of the book’s premise and teaching. They believe in the law of attraction. The one problem that The Secret poses is that it simplifies and speculates way too much and there are a quite a significant level of moral defects, the lack of scientific backing, and the various philosophical shortcomings, how is it that a significant number of people still believe there’s something to The Law of Attraction? Part of the reason must certainly be the powerful testimonials coming from celebrity figures such as Oprah Winfrey, a woman who attributes her success to her mighty powers of attraction. Of course, that’s a long way from the simple model of Ask-Believe-Receive. In most people’s lives, positive thought leads to success only through the transforming medium of action. But as the author Rhonda said in an interview, she just wants to bring happiness to everybody. That’s the reason it all began. And to her credit, she does bring happiness to many people worldwide and surely there is nothing, in principle, wrong with thinking about what makes you happy.

Balance Sheet and Customer Segments Essay

Exhibit 16 of the document showed DLJdirect’s income statement from 1994-1999 (in millions). Exhibit 17 showed DLJdirect key financial and operating performance. The revenue increased steadily from 1994 to 1997. The revenue increase $50 million in 1998 which is equivalent to 43% increase. In 1999 the revenue increased about $44 million. The income was stable prior to 1997 when the company experienced a loss and able to recovered the next year in 1998. In 1999, the company reached the highest income because of the huge commission increase in that year. Overall, the company is making good progress over the years with steady increment of commissions, total trades, average daily trades, total accounts and total customer assets. Does DLJdirect have the financial capability to address new segments, e.g. to do more advertising to attract new kinds of customers? DLJdirect does have the financial capability to address new segments in the market and increase advertising to attract new customers. However when compared to its competitors, they are spending more money on customer acquisition. For example, E*Trade customer acquisition budget was projected to be $300 million in 1999. That’s 50% less than DLJdirect’s total cost and expenses in 1999. For now, the company should build a steady and reliable reputation in the market before spending more money on advertising alone. Identify the ways DLJdirect’s trading service is differentiated from competitors Tiered services for accounts with high asset balances and speed of execution are the two ways DLJdirect differentiates itself from competitors. Customers with asset balance in excess of $100,000 are provided with access to DLJ research and greater access to DLK-manages IPOs. For customers who have more in $1 million or more assets, DLJdirect reduced certain fees, provided a personal service team, and offered more trading time. Exhibit 14 below shows the DLJdirect advantage in speed of execution. According to the stats, DLJdirect provide the fastest transaction speed and availability of each brokerage’s home page during business hours. The speed of transaction is at least 0.3 seconds ahead of it competitors. The company also leads the availability with 99.4%. What are the needs of each of the four customer segments? Which needs are well-matched to DLJdirect’s capabilities? Retirement by the Book (RBB), Portfolio Cruise Control (PCC), Aggressively Affluent (AA) and Get Rich Fast (GRF) are the four customer segments of DLJdirect’s market. RBBs are mass-market investors who tolerate moderate levels of risk and they require reliable trade execution, user-friendly interfaces, and a variety of financial offerings. This segment has a high assets and stability. PCCs averaged total assets in excess of $350,000 but they did not trade very frequently. AAs are the largest internet investor segment with high net worth individuals who averaged over $300,000 in asset and traded more than ten times a year. GRFs are young individuals who made frequent minute to minute basis small trades. They value speed of transaction which is suitable for online traders. AA and GRF segments probably are well-matched to DLJdirect’s capabilities. DLJd irect targeted self-directed online investors who on average have a higher account balances than other investors. AAs customers are aggressive more likely to buy large blocks of stock, trade on margin and own a diverse range of financial investments. Many of them were customers of DLJdirect competitors who seek a move to a higher end online broker. Meanwhile, GRF preferred to not pay for services but they traded more frequently than any other segments. Rank the customer segments according to the profit potential in serving them GRF segment is the most valuable segment as they traded frequently on a daily basis. This enables the company to gain profit quickly in short space of time. AA segment is the second highest because they traded quite frequently and paid food amount for services and information. RBB is the next segment because of its good standing in asset balance and brought interest in. PCC would be the last segment. Although they have an excess amount of average balances, they do not prefer to trade online which makes them has the least profit potential. Should DLJdirect target the Get Rich Fast (day trader) segment? Why? Since this segment traded more frequently than others, they value DLJdirect fast and reliable service that the company could offer. DLJdirect could provide the services that GRF segment sought which are low fees, transaction confidence and site performance. The company could attempt to target this segment but they should not spend a huge amount of money for this customer acquisition. Based on exhibit 10 in the document, it showed that the size of this market segment is reducing as the years go by. When compared to high-end customers, the company needs to assign a higher discount rate to this segment because they swing the health of the stock market. Another problem is that this segment consists of less affluent traders. Therefore, it is advisable for them not to go into this market because the company could not build a long-term profitability in this segment. In your opinion, are there other customer segments that DLJdirect should target? Why? In my opinion, DLJdirect should not target other customer segments besides AA and GRF. The reason is because the company has been doing well in AA segment which is proven by the company good financial standing. With AA segment is projected to dominate the market in the future, the company should continue focusing their customer acquisition in this market. By doing this, the company could steadily build a reputation and acquire a long-term profitability in this segment.

Introduction to Wind Tunnel

The basic concept and operation of subsonic wind tunnel was demonstrated in this experiment by conducting airfoil drag analysis on a NACA 0015 airfoil. The small subsonic wind tunnel along with apparatus such as, the manometer rake, the inclined manometer and the pitot – static tube were used with different baffle settings to record varying pressure readings. To achieve this objective, some assumptions were made for the lower range of subsonic flow to simplify the overall analysis.From the obtained aerodynamic measurements using a pitot-static tube mounted ahead of the airfoil at the test section, the actual velocity was determined and by relating it to the theoretical velocity, the velocity coefficient was calculated. The velocity coefficient varies for each baffle setting by a factor of decimals, thus the velocity coefficient can be used as a correction factor. Further, the coefficients of drag were calculated for the following angles of attack, 10o, 15o, and 20o and were co mpared with the published values. INTRODUCTIONThe wind tunnel is an absolute necessity to the development of modern aircrafts, as today, no manufacturer delivers the final product, which in this case can be civilian aircrafts, military aircrafts, missiles, spacecraft, and automobiles without measuring its lift and drag properties and its stability and controllability in a wind tunnel. Benjamin Robins (1707-1751), an English mathematician, who first employed a whirling arm to his machine, which had 4 feet long arms and it, spun by falling weight acting on a pulley however, the arm tip reached velocities of only few feet per second. 4] Figure 1: Forces exerted on the airfoil by the flow of air and opposing reaction on the control volume, by Newton’s third law. [1] This experiment will determine drag forces experienced by a NACA 0015 airfoil, subjected to a constant inlet velocity at various baffle settings with varying angles of attack.DATA ANALYSIS, THEORATICAL BACKGROUND AND PROCEDURE Apparatus in this experiment as shown in the figure 2, consisted of a small subsonic wind tunnel. The wind tunnel had an inlet cross-section of 2304 in2 and an outlet crosses section of 324 in2. A large compressor forced air from room) into the inlet through the outlet tunnel and back into the room. This creates a steady flow of air and a relative high velocity can be achieved in the test section. Instrumentation on the wind tunnel consisted of an inclined manometer and a pitot-static tube in the test section also a manometer rake behind the tested objet (airfoil NACA 0015). The manometer rake consisted of 36 inclined manometers; number 36 is used as a reference for the static pressure. All other manometer measures the pressure behind the object in the airflow. Figure 2: Wind tunnel set up with instrumentation [5]Before the experiment was performed the laboratory conditions were recorded, the room temperature was measured to be 22. 5 C (295. 65) and the atmospheric pressur e 29. 49 inHg (99853. 14Pa). Theory The setup of this experiment includes a NACA 0015 airfoil placed in the wind tunnel. Considering the cross-sectional area A1, velocity V1, and the density of air p1 at the inlet and similarly the cross-sectional area A2, velocity V2, and the density of air p2 at the outlet and by assuming that no mass is lost between the inlet-outlet section, we get the mass conservation equation, p1 V1 A1 = p2 V2 A2 (1).Further, the airflow can be assumed to be incompressible for this experiment due to low velocity, the equation (1) can be reduced to V1 A1 = V2 A2 (2), moreover, the air is assumed to be inviscid, the Bernoulli’s equation, p1+12? V12=p2+12? V22 (3) and the equation (2) can be reduced to Vth=2(p1-p2)/? 1-A2A12 (4) in order to find the theoretical velocity. The pitot – static tube is used to calculate the actual velocity of the flow by using, Vact= 2(p2-p1)? (5). Furthermore, the velocity coefficient can be calculated using, Cv=VactVth (6).The pressure and shear stress acting on the NACA 0015 airfoil produces a resultant force R, which according to the Newton’s third law produces an equal and opposite reaction force. For this experiment, in the condition of lower range of subsonic velocity, it can be assumed that pressure and density will be constant over the airfoil thus, D=jj+1? (uo2-ui2)dy=-12? uj2+uj+12o-uj2+uj+12iyj+1-yj (7) can be used to calculate the drag and, CD=Drag12(? air*Velocity2*area) (8) can be used for calculating the coefficient of drag. Procedure Part 1, Variation of inlet cross section:In this first part we recorded the pressure behavior in the test section by decreasing the inlet area. After the safety instructions were given by the TA and a chart for the readings prepared on the white board the wind tunnel was turned on. Two students were taking readings simultaneously from the inclined manometer in the test section and the static pitot tube, the readings were recorded in table 1. Bet ween each reading the compressor was turned off due to the sound level, it was important to give the compressor some time after each start up to have the same conditions as in the previous measurement.Part 2, recording the wake profile of NACA 0015 For this part of the experiment the inlet area was fully opened and the airfoil first set to an angle of attack of 10, the wind tunnel was turned on and all 36 readings recorded (table 2) from the manometer rake. The measurement was repeated for an angle of attack of 15 and 20. RESULTS AND DISCUSSION The linear relationship between the V actual and the V theoretical approves of the theory that the velocity coefficient, Cv can be used as a correction factor for the theoretical velocity. This is further demonstrated in (Graph2). The calculated results are shown in table 1.The approximated literature values of the coefficient of drag for NACA 0015 airfoil were obtained from a NASA published report [3] for the 10o AoA, the percent relative er ror is 3. 1%, for 15o AoA, the percent relative error is 31. 0%, and for the 20o AoA, the percent relative error is 38. 7%. Increases in angle of attack lead to a more disturbed airflow behind the wing section. This disturbed airflow created more drag, these drag forces were clearly observable in table 3, 4. The angle of attack can be increased until the total drag forces become larger than the resultant lift- force; a wing is then no longer effective and stalls.The calculated drag forces are shown in tables 2-4. According to NASA, in their published report of Active flow control at low Reynolds numbers on a NACA 0015 airfoil, its is suggested that, by positioning the wake rake around 4. 5 times chord length behind wing to survey the wake. Further, two pressure orifices on opposite tunnel walls, aligned with the wake rake can be used to determine the average wake static pressure. This type of wake rake enables the wake to be surveyed with only a few moves of the wake rake, hence imp roving the measurements of drag using wake rake. 2] At large angles of attack, the upstream velocity of the airfoil can no longer be considered as the free-stream velocity, largely due to the miniature size of the wind tunnel relative to the NACA 0015 airfoil hence, the assumption that the uo max > ui is valid for this experiment.CONCLUSION Ergo, it is evidently seen in the graphs 1 and 2 that, the averaged velocity coefficient, Cv, 1. 063 can be used as the correction factor for the theoretical velocity. Further, the accurate (4-32) drag forces were calculated to be 2. 72 N, 13. 46 N, and 46. 4 N for the following angles of attack, 10o, 15o, and 20o. Moreover, the drag coefficient were also calculated based on the observed data and than were directly compared with the literature values. For the 10o of angle of attack, the percent relative error was very minimal at 3. 1% however; the drag coefficients for the 150 and the 20o were not very accurate, with the percent relative error of 31. 0% and 38. 7% respectively. This can be improved by implementing a smaller airfoil, so that the proportion of the wind tunnel covered by the airfoil is significantly smaller.Also, the skin friction losses along the edges of the wind tunnel may very well be taken into the account to achieve greater accuracy. Finally, it can be concluded that, as the angle of attack of the airfoil increases, the drag force will also increase due to the effect of flow separation. REFERENCES [1] Walsh, P. , Karpynczyk, J. , â€Å"AER 504 Aerodynamics Laboratory Manual† Department of Aerospace Engineering, 2011 [2] Hannon, J. (n. d. ). Active flow control at low reynolds numbers on a naca 0015 airfoil. Retrieved from http://ntrs. nasa. gov/archive/nasa/casi. ntrs. nasa. gov/20080033674_2008033642. pdf [3] Klimas, P.C. (1981, March). Aerodynamic characteristics of seven symmetrical airfoil section through 180-degree angle of attack for use in aerodynamic analysis of vertical axis wind turbi nes. Retrieved from http://prod. sandia. gov/techlib/access-control. cgi/1980/802114. pdf [4] Baals, D. D. (1981). Wind tunnels of nasa. (1st ed. , pp. 9-88). National Aeronautics And Space Administration. [5]Fig. 1, Wind tunnel set up with instrumentation, created by authors, 2012 APPENDIX Sample Calculations Note: AoA = ANGLE OF ATTACK. Sample calculations part 1, Baffle opening 5/5: Conversion inH2O to Pa (N/m2): 1 inH2O=248. 2 Pa (at 1atm) ?2inH2O ? 248. 82 PainH2O=497. 64 Pa Theoretical velocity: Equation (4): Vth=2(p1-p2)/? 1-A2A12 , where p1-p2=497. 64 Pa, A2=2304 in2, A1=324 in2, ? Density air (ideal gas law) laboratory conditions; 22. 5 C (295. 65K), 29. 49 inHg (99853. 14Pa): ? =pRT=99853. 14Pa287JkgK(295. 65K)? 1. 1768 kgm3 ?Vth=2(497. 64pa)/1. 1768kgm31-2304 in2324 in22=29. 37m/s Actual velocity: Equation (5):Vact= 2(p2-p1)? where p1-p2=522. 52 Pa, ? =1. 1768 kgm3 ? Vact= 2(522. 52Pa)1. 1768 kgm3=29. 80 m/s Velocity coefficient: Equation (6): Cv=VactVth=29. 8029. 37=1. 0 15 Sample Calculations Part 2, Angle of attack 10o, tube 1For dL, tube number 36 served as a reference pressure for all readings: 26. 4cm – 9. 2cm = 17. 2cm or 0. 172m Pressure difference, equation (7): ?p=SG*? H2O*g*L*sin? =1*1000kgm3*9. 81ms2*0. 172m*sin20o=577. 06 Pa Velocity, equation (8) note; pressure difference previously calculated: V1=2*SG*? H2O*g*L*sin air=2*577. 06 Pa1. 1768kgm3=31. 32 m/s Drag force, equation (9), for ui a velocity away from the tunnel wall was chosen to achieve a more realistic drag force: D=jj+1? (uo2-ui2)dy=-12? uj2+uj+12o-uj2+uj+12iyj+1-yj=-121. 1768kgm3(31. 32ms)2+( 31. 5ms)2o-2(31. 5m/s)2i0. 01m=0. 07 N Total drag force, summation lead to:Dtotal = 9. 04 N, however due to the boundary layer along the inner walls of the wind tunnel a more accurate summation is the sum of the values of tubes 4-32 which results in a total drag force of 2. 72 N. Coefficient of Drag Equation (9), for the drag force the more accurate summation of tube 4-32 was used : CD=Drag12(? air*Velocity2*area)=2. 72N12(1. 1768kgm3*31. 50ms2*(0. 1524m*1. 00m)=0. 031 To compare the Cd to a value found in literature the Reynolds number is required: Re=? air*V*cViscosity=1. 1768kgm3*31. 50 m/s*0. 1524m1. 789*10-5kgs*m=315782. 35 Observation and Results for Part 1Table 1, Observations/Results part 1| Baffle Opening| Inclined Manometer (inH2O)| Pa ( x 248. 82 Pa/inH2O)| Pitot Static (inH2O)| Pa ( x 248. 82 Pa/inH2O)| V theoretical (m/s)| V actual (m/s)| Cv| 5;5| 2. 00| 497. 640| 2. 10| 522. 52| 29. 37| 29. 80| 1. 015| 4;5| 1. 80| 447. 876| 1. 90| 472. 75| 27. 87| 28. 35| 1. 017| 3;5| 1. 15| 286. 143| 1. 25| 311. 02| 22. 27| 22. 99| 1. 032| 2;5| 0. 45| 111. 969| 0. 46| 114. 46| 13. 93| 13. 95| 1. 001| 1;5| 0. 05| 12. 441| 0. 08| 19. 905| 4. 64| 5. 82| 1. 252| Table 1: The theoretical velocity was calculated using the eq. (4) and the actual velocity was calculated using the eq. 5) from the obtained pressure data from the hand held pitot tube. The velocity coeffic ient, Cv, was calculated using the eq. (6). Note: The sample calculations are given in the appendix section of this report. Graph 1: The results from Table 1 were used to create the plot of V actual Vs. V theoretical. Graph 2: The plot of the velocity coefficient and the actual velocity. From the plot, it can be clearly seen the very minute difference between the velocity coefficient values. Observation and Results for Part 2 Table 2, Observations/Recordings part 2, Angle of attack 10 | Fluid length in tube ( ±. 1cm), Inclination 20|Tube Nr. | L (cm)| dL (cm)| Pressure (Pa)| u (m/s)| Drag force (N)| 1| 9. 2| 0. 07| 0. 07| 0. 07| 0. 07| 2| 9. 0| 0. 00| 0. 00| 0. 00| 0. 00| 3| 9. 0| 0. 00| 0. 00| 0. 00| 0. 00| 4| 9. 0| -0. 07| -0. 07| -0. 07| -0. 07| 5| 8. 8| -0. 13| -0. 13| -0. 13| -0. 13| 6| 8. 8| -0. 13| -0. 13| -0. 13| -0. 13| 7| 8. 8| -0. 07| -0. 07| -0. 07| -0. 07| 8| 9. 0| 0. 00| 0. 00| 0. 00| 0. 00| 9| 9. 0| 0. 00| 0. 00| 0. 00| 0. 00| 10| 9. 0| -0. 03| -0. 03| -0. 03| -0. 0 3| 11| 8. 9| -0. 03| -0. 03| -0. 03| -0. 03| 12| 9. 0| -0. 03| -0. 03| -0. 03| -0. 03| 13| 8. 9| -0. 07| -0. 07| -0. 07| -0. 07| 14| 8. 9| 0. 64| 0. 64| 0. 64| 0. 64| 5| 11. 0| 1. 68| 1. 68| 1. 68| 1. 68| 16| 12. 0| 1. 01| 1. 01| 1. 01| 1. 01| 17| 9. 0| -0. 03| -0. 03| -0. 03| -0. 03| 18| 8. 9| -0. 03| -0. 03| -0. 03| -0. 03| 19| 9. 0| 0. 00| 0. 00| 0. 00| 0. 00| 20| 9. 0| 0. 00| 0. 00| 0. 00| 0. 00| 21| 9. 0| -0. 03| -0. 03| -0. 03| -0. 03| 22| 8. 9| -0. 07| -0. 07| -0. 07| -0. 07| 23| 8. 9| -0. 07| -0. 07| -0. 07| -0. 07| 24| 8. 9| -0. 10| -0. 10| -0. 10| -0. 10| 25| 8. 8| -0. 10| -0. 10| -0. 10| -0. 10| 26| 8. 9| -0. 03| -0. 03| -0. 03| -0. 03| 27| 9. 0| 0. 00| 0. 00| 0. 00| 0. 00| 28| 9. 0| 0. 00| 0. 00| 0. 00| 0. 00| 29| 9. 0| 0. 00| 0. 00| 0. 00| 0. 00| 30| 9. 0| 0. 00| 0. 00| 0. 0| 0. 00| 31| 9. 0| 0. 07| 0. 07| 0. 07| 0. 07| 32| 9. 2| 0. 34| 0. 34| 0. 34| 0. 34| 33| 9. 8| 0. 34| 0. 34| 0. 34| 0. 34| 34| 9. 2| 0. 07| 0. 07| 0. 07| 0. 07| 35| 9. 0| 5. 84| 5. 84| 5. 84| 5. 84| 36| 26. 4| 0| Reference| 0. 00| 0. 00| Total drag force (1-35)| 9. 04| Total drag force (4-32)| 2. 72| Coefficient of drag calculated| 0. 031| Coefficient of drag literature| 0. 030| Table 3, Observations/Recordings part 2, Angle of attack 15 | Fluid length in tube ( ±. 1cm), Inclination 20| Tube Nr. | L (cm)| dL (cm)| Pressure (Pa)| u (m/s)| Drag force (N)| 1| 8. 2| 0. 06| 0. 06| 0. 06| 0. 06| 2| 8| -0. 01| -0. 01| -0. 1| -0. 01| 3| 8| -0. 01| -0. 01| -0. 01| -0. 01| 4| 8| -0. 04| -0. 04| -0. 04| -0. 04| 5| 7. 9| -0. 08| -0. 08| -0. 08| -0. 08| 6| 7. 9| -0. 04| -0. 04| -0. 04| -0. 04| 7| 8| -0. 01| -0. 01| -0. 01| -0. 01| 8| 8| -0. 01| -0. 01| -0. 01| -0. 01| 9| 8| 0. 19| 0. 19| 0. 19| 0. 19| 10| 8. 6| 0. 49| 0. 49| 0. 49| 0. 49| 11| 8. 9| 0. 49| 0. 49| 0. 49| 0. 49| 12| 8. 6| 0. 39| 0. 39| 0. 39| 0. 39| 13| 8. 6| 0. 56| 0. 56| 0. 56| 0. 56| 14| 9. 1| 1. 40| 1. 40| 1. 40| 1. 40| 15| 11. 1| 2. 51| 2. 51| 2. 51| 2. 51| 16| 12. 4| 2. 74| 2. 74| 2. 74| 2. 74| 17| 11. 8| 2. 40| 2. 40| 2. 40| 2. 40| 18| 11. 4| 2. 00| 2. 00| 2. 00| 2. 00| 9| 10. 6| 1. 47| 1. 47| 1. 47| 1. 47| 20| 9. 8| 1. 06| 1. 06| 1. 06| 1. 06| 21| 9. 4| 0. 79| 0. 79| 0. 79| 0. 79| 22| 9| 0. 63| 0. 63| 0. 63| 0. 63| 23| 8. 9| 0. 49| 0. 49| 0. 49| 0. 49| 24| 8. 6| 0. 39| 0. 39| 0. 39| 0. 39| 25| 8. 6| 0. 32| 0. 32| 0. 32| 0. 32| 26| 8. 4| 0. 26| 0. 26| 0. 26| 0. 26| 27| 8. 4| 0. 26| 0. 26| 0. 26| 0. 26| 28| 8. 4| 0. 26| 0. 26| 0. 26| 0. 26| 29| 8. 4| 0. 26| 0. 26| 0. 26| 0. 26| 30| 8. 4| 0. 26| 0. 26| 0. 26| 0. 26| 31| 8. 4| 0. 26| 0. 26| 0. 26| 0. 26| 32| 8. 4| 0. 32| 0. 32| 0. 32| 0. 32| 33| 8. 6| 0. 56| 0. 56| 0. 56| 0. 56| 34| 9. 1| 0. 56| 0. 56| 0. 56| 0. 56| 35| 8. 6| 6. 30| 6. 0| 6. 30| 6. 30| 36| 26. 2|   0. 00| Reference  | 0. 00  | 0. 00  | Total drag force (1-35)| 19. 55| Total drag force (4-32)| 13. 46| Coefficient of drag calculated| 0. 145| Coefficient of drag literature| 0. 100| Table 4, Observations/Recordings part 2, Angle of attack 20 | Fluid length in tube ( ±. 1cm), Inclination 20| Tube Nr. | L (cm)| dL (cm)| Pressure (Pa)| u (m/s)| Drag force (N)| 1| 8| 0. 16| 0. 16| 0. 16| 0. 16| 2| 7. 6| 0. 03| 0. 03| 0. 03| 0. 03| 3| 7. 6| 0. 03| 0. 03| 0. 03| 0. 03| 4| 7. 6| 0. 03| 0. 03| 0. 03| 0. 03| 5| 7. 6| 0. 03| 0. 03| 0. 03| 0. 03| 6| 7. 6| 0. 03| 0. 03| 0. 03| 0. 03| 7| 7. 6| 0. 03| 0. 3| 0. 03| 0. 03| 8| 7. 6| 0. 09| 0. 09| 0. 09| 0. 09| 9| 7. 8| 0. 16| 0. 16| 0. 16| 0. 16| 10| 7. 8| 0. 23| 0. 23| 0. 23| 0. 23| 11| 8| 0. 50| 0. 50| 0. 50| 0. 50| 12| 8. 6| 1. 17| 1. 17| 1. 17| 1. 17| 13| 10| 2. 37| 2. 37| 2. 37| 2. 37| 14| 12. 2| 3. 58| 3. 58| 3. 58| 3. 58| 15| 13. 6| 5. 39| 5. 39| 5. 39| 5. 39| 16| 17. 6| 7. 21| 7. 21| 7. 21| 7. 21| 17| 19| 7. 88| 7. 88| 7. 88| 7. 88| 18| 19. 6| 7. 88| 7. 88| 7. 88| 7. 88| 19| 19| 7. 04| 7. 04| 7. 04| 7. 04| 20| 17. 1| 5. 73| 5. 73| 5. 73| 5. 73| 21| 15. 1| 4. 09| 4. 09| 4. 09| 4. 09| 22| 12. 2| 2. 44| 2. 44| 2. 44| 2. 44| 23| 10. 2| 1. 37| 1. 37| 1. 37| 1. 37| 4| 9| 0. 66| 0. 66| 0. 66| 0. 66| 25| 8. 1| 0. 29| 0. 29| 0. 29| 0. 29| 26| 7. 9| 0. 23| 0. 23| 0. 23| 0. 23| 27| 7. 9| 0. 23| 0. 23| 0. 23| 0. 23| 28| 7. 9| 0. 19| 0. 19| 0. 19| 0. 19| 29| 7. 8| 0. 19| 0. 19| 0. 19| 0. 19| 30| 7. 9| 0. 19| 0. 19| 0. 19| 0. 19| 31| 7. 8| 0. 19| 0. 19| 0. 19| 0. 19| 32| 7. 9| 0. 46| 0. 46| 0. 46| 0. 46| 33| 8. 6| 0. 50| 0. 50| 0. 50| 0. 50| 34| 8| 0. 29| 0. 29| 0. 29| 0. 29| 35| 8| 6. 40| 6. 40| 6. 40| 6. 40| 36| 26. 2| 0| 0. 00| 0. 00| 0. 00| Total drag force (1-35)| 51. 30| Total drag force (4-32)| 46. 64| Coefficient of drag calculated| 0. 489| Coefficient of drag literature| 0. 300|

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Comparative advantage Essay Example | Topics and Well Written Essays - 1750 words

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