The Pearl Essay Paper Example For Students

The Pearl Essay Paper Character Analysis of Kino from The Pearl Kino, a character from the story The Pearl, is a prime example of a developing character. From the start through to the end, he develops drastically. At the beginning, he was thought out to be a good loyal husband but as time went on he became a selfish, greedy person who would do anything for money. When the story began Kino seemed to be a good husband who wanted nothing more than to be able to support his family. After a scorpion had stung Coyotito, Kino prayed that he would find a pearl not to become a rich man but so that he could pay the doctor to heal the baby, as he would not work free. After Kino had spent long hard hours searching the ocean floor, he finally found the pearl he had worked for. At first when he found it, he only wanted to pay the doctor to cure Coyotito. However as time passed he began to think of all the things that he could acquire with the money form the pearl and began to develop greed and selfishness. When people asked him what he would buy now that he was a rich man, he was quick to list several items that came to his mind. One of these items was a rifle. Kino wanted a rifle because he wanted to show power over the rest of his village. We will write a custom essay on The Pearl Paper specifically for you for only $16.38 $13.9/page Order now When Kino took the pearl to the pearl buyers to sell, he was offered one thousand pesos. Kino declined that offer claiming that his pearl was The Pearl of the World. By reacting in such a manner he yet again demonstrates his greed. It is not about saving Coyotito anymore, for he is already feeling well, it is now about the money. Although one thousand pesos was more money than Kino had ever seen he demanded that he would get fifty thousand pesos. Later in the text, Kino discovers Juana trying to destroy the pearl, causing Kino to become very angry, and resulted in him beating her. Although Juana was in very much pain she accepted the beating as if it were a punishment and stayed with Kino. A while later Kino was attacked by another man who wanted the pearl for himself and defended his pearl by killing the man. It is around this point in the story where Kino displays his greatest point of greed and selfishness. When Kino gets ready to attack the trackers Coyotito lets out a cry awakening one of the sleeping trackers. The tracker on watch described the cry as being the cry of a baby, however, the tracker who had just awaked described it as being a coyote. The tracker on guard then lifted his rifle and shot in the direction of the sound. This sparked the deadliest of fuses in Kino, which turned him from a normal man into a fearsome, uncontrollable, machinelike man killing everything in its path. When Kino returned to the village he looked at the pearl and began to realize the effect it had on him, his family, and his village, and decided to throw it back into the ocean where it came from. Kino has paid a large price to learn such a valuable lesson, that we should not let greed and our want for something to overcome us and let us lose sight of the important things in life such as family, health, and life itself.

The Real Possibilities of Cloning essays

The Real Possibilities of Cloning essays On February 22, 1999 news was announced that Dolly the lamb was the first successful animal cloned. Unlike the other cloning experiments done over the past 15 years, this was the first successful clone made with an adult cell. The cell was used to activate and program the egg from which Dolly grew. Past clones involved using the cell from a fertilized embryo in the early stages of development. As news of Ian Willmut's cloned lamb got out across the globe, many people feared what they thought could possibly never come true. With the technology to clone identical animals, can humans be cloned too? Since then topic of discussion throughout the scientific world has centered on the cloning of humans. Recently, The University of Texas lab cloned the first headless creatures, headless mice. Since then, headless tadpoles have also been born at The University of Blath. This discovery is even more chilling because it opens up the door to headless humans, for purposes such as organ banks. Headless human production could also be used as a means for testing out new treatments for diseases such as cancer. Controversy is coming up more often considering the morals and ethics of cloning. Is headless cloning opening the gate to human immortality? Is a headless clone ever a living creature? Many people are beginning to wonder if cloning will be beneficial to our country. The cloning of animals as well as human cloning could prove very beneficial to our nation. For instance, cloning research would be very beneficial to improving the vitro fertilization process. Vitro fertilization is when a woman's egg is removed from her uterus, fertilized by a sperm donation, and replaced back in the uterus. John Robertson, an authority on reproductive technology and the law at the University of Texas School of Law says, "Even if they only produced three or four embryos, it could greatly improve the odds that it will work (Robertson, 3)." This c...

Poor Teaching and Misbehaving Teachers

Poor Teaching and Misbehaving Teachers Student social media users mentioned many interesting problems they faced in school. The majority of this #StudentProblems101 are classroom problems such as difficulty in understanding lessons, humiliation, stress, and boredom. Personal problems, on the other hand, include sleep deprivation and miserable weekends and holidays due to homework. ~ Poor Teaching Poor teaching according to one study is associated with teacher’s lack of care and concern, poor social relationships, and insensitiveness to students learning requirements. In fact, student’s cognitive learning and enjoyment are highly dependent on the quality of teaching. The reason is that poor teachers decreased students’ self-confidence and motivation for learning and increase their anxiety while in the classroom. ~ Humiliation Classroom problem such as humiliation according to these social media users commonly occur when the teacher mention his or her name as an example of a bad student. For instance, â€Å"Study hard and don’t be late like Paul.† According to the result of the study conducted by Breaux and Whittaker, most participants experienced humiliation from a teacher. Offensive teachers are those who humiliate students, blame students for problems in the classroom and engage in sarcasm. They are mean and cruel, play favorites, and self-centered. ~ Stress Boredom Students with teachers who take pride in punishing students often experience stress and boredom. For instance, some teachers systematically overload students with content and impose nearly unattainable objectives, make test difficult, and punish students with low grades. Indolent teachers, on the other hand, are those who deliver boring lectures, lack basic teaching skills, arrived late, neglect to grade homework, and make their classes too easy. You will definitely enjoy these articles: College Students Developing Students Creativity and Self-Expression through Crayons Helping Autistic Students Shine in Mainstream Classroom International Students Relieving Students Scool-Related Stress There Is No Place Like Home Students are young people with natural curiosity and eagerness to learn. However, they are also outgoing people with interest other than school. Putting pressure on a young person, therefore, is counterproductive and may lead to some negative attitude towards learning. For instance, a teenager consistently deprived of sleep and missed out things such as family gets together, sport events, and so on, because of homework, may eventually hate homework and school. Young people tend to see social demands of school life extremely difficult when they spend most of their days in study tables. Study of issues in education suggests that most students seem to misbehave and hate school when they put much more time in homework. This is because young people need to play, spend time with family and friends, and do things they love. Although homework according to several studies has positive effects particularly in high school, the result of other studies suggests that it greatly affect students’ feelings and attitudes about school negatively. These include loss of interest in academic material and physical and emotional stress. In reality, homework robs students of valuable leisure and family time and time to spend on developing other interest. Moreover, excessive lesson time and homework time eventually result to burn out or students alienation from the academic material. In fact, study shows that some students left school because of homework and exacerbate the division between high and low-income families. For instance, students from more progressive backgrounds are likely to have more time and parental support than those with disadvantaged demographic backgrounds.

Interview with an Entrepreneur Assignment Example | Topics and Well Written Essays - 2500 words

Interview with an Entrepreneur - Assignment Example evealed under the heading of Interview Summary, has been scheduled to focus on eight particular issues that had been of substantial importance during one’s migration from being employed to being an independent individual with high hopes of becoming a successful entrepreneur. The interview starts with the factors that inspire a person to be self employed. Next, light has been shed on the changes that take place in his life since he had opted to be self employed and the measures adopted by him to cope with those changes. Subsequently, questions were aimed at understanding his opinions on skill requirements and other aesthetic aspects associated with entrepreneurship. The basis of this interview is to try and substantiate an individual’s decision of gauging the comparatively riskier waters of entrepreneurship by sacrificing the sense of security that employment confers. Life has turned to a new leaf since I have moved from employment to self employment. Previously job responsibilities were routine based tasks which had comparatively lower responsibilities. Self employment has imposed greater responsibilities and there is no limit with regards to the volume of work. After moving to the role of an entrepreneur I have also started devoting fewer times to my family and friends. The best part however is that I welcome this change. On the professional front entrepreneurship has provided me with lots of freedom to explore and try out new ideas which is quite different from a routine job where there is less room for exploring new ideas. Certain changes have come as a pleasant experience like added responsibilities, work pressure etc. It was difficult in the very beginning since the entire gamut of the business fell upon my shoulders. Family and personal life has of late taken a beating as I have been unable to devote time to my family. On this occasion I would sincerely thank my wife, my children and my friends who have been supporting me in my new initiative. The

Exploratory and Confirmatory Factor Analysis Essay

Exploratory and Confirmatory Factor Analysis - Essay Example The article makes use of concepts derived socio-technical theory as well as the role theory in an attempt to show the relationship between technostress and productivity. In the article, CFA and EFA approaches are applied in investigating the theoretical constructs and the factors represented in the study about the relationship between technostress and human productivity (Chilton, Hardgrave, & and Armstrong, 2005). The two approaches enhance the hypothesis that the factors used are correlated. Three hypotheses are thus developed. In hypothesis 1, stress comes out as people try to respond to various factors. Hypothesis 2 depicts stress as correlated to the roles of individuals within organizations. Hypothesis 3 also shows a correlation between technology and organization roles (Tarafdar, Nathan, & Ragu-Nathan, 2007). The two approaches are used in accessing the quality of every item used in the study. Both the CFA and the EFA are applied for both confirmatory and exploratory purposes. This aspect is seen in the three hypotheses, which address the three variables differently. While EFA and CFA are seen to have several similarities in their statistical applications, they greatly contrast in certain ways as well. The use of EFA required that a decision is made on the number of factors applied through an examination of the output from an analysis of principal component (Nygaard & Dahlstrom, 2002). For the article, a five-factor structure is first established to analyze the items. Conversely, the use of CFA requires a specification of the number of factors before the analysis. (Tarafdar, Nathan, & Ragu-Nathan, 2007) Again, the CFA involve the specification of a particular factor structure with an indication of the factor on which each item would load while in the case of EFA, all items load all the factors. In estimating factor loading, maximum likelihood is used, but

It is not possible to be a disciple of Jesus in the modern world Essay Example for Free

It is not possible to be a disciple of Jesus in the modern world Essay It is not possible to be a disciple of Jesus in the modern world I disagree with this statement, although I recognise that it is not always easy to be a disciple I believe it is possible for those who have faith. We are first called to discipleship at Baptism where the father of the child lights a candle from the Pascal candle as a sign of his responsibility to enable his son/daughter to grow in full faith. I believe that faith makes everything possible, if we have faith in God and his teaching we can achieve our hopes and dreams. If we have faith then living, as a true disciple is part of our way of life, we as Christians in todays world should try to live our lives as Jesus lived his. Without faith what meaning would life itself have for us, what would be the use in perusing life if it had no meaning to us. If we believe then we can reach goals and discipleship can bring joy and purpose to our lives we can achieve goals and targets we set for ourselves. Nothing is impossible to he who believes Faith in God is not always easy to maintain; if we pick up a newspaper what headings do we usually see? Usually something related to drugs, alcohol, kidnapping, and murder. What example is this setting to children? While there parents are teaching them about how caring we should be, and how we should love our neighbour as ourselves, these children look at the newspapers or even the news and see people who have lost arms or legs as someone has shot them. What kind of example is this of loving your neighbour? What affect is this going to have on these children in the long term? They will grow up with the opinion that this is acceptable and everybody does it why should they be different to the rest? To be a true disciple we must have immense faith in God, if we have faith nothing is impossible. But there are many difficulties which disciples of Jesus have to face when trying to carry out the work of God, one of the most difficult to deal with is peer pressure. Many people, particularly the young people, feel unable to resist the pressures put upon them by their peers and therefore behave in a way which goes against the teaching of the gospel. There are many pressures maybe to smoke, drink, vandalise others property, tell lies, use foul language, and have a sexual relationship before marriage. If enough pressure is put on these people it is very difficult to say no! And therefore they are going against the teaching of Jesus not because they want to it is because they are not strong enough to resist temptation, and they are afraid others will treat them differently. Other pressures come from the media we usually get a picture from the media of very anti-Christian values and standards. Take magazines for example they tell stories of unmarried people having a sexual relationship or young people smoking and drinking, and this is all classed as Normal and acceptable in our world. They do not present the Christian way of life as being worthwhile and Cool or up to date. We also get a lot of anti-Christian standards from the television, films, and videos. These can have a very powerful influence on the lives of many people; most soap operas and films present a non-Christian way of life. How often do you see a Christian family in a soap opera, and if there is Christian families do you ever notice that they always seem to be laughed at by the rest of the families as they are seen to be out of date and definetly not trendy. Television I believe influences many people, who is going to get up early on a Sunday morning to watch the Christian services carried out in different chapels, while they could be watching Eastenders or a popular music show! There are many ways television influences us they give us pictures of what is normal in our society such as sex before marriage, abortions are acceptable, divorce is a fact of life, the only purpose in life is to search for pleasure, and violence is acceptable and part of everyday life. Media can make Christians feel confused and unsure of their own beliefs The way of life presented by the media is often made to seem more attractive, more enjoyable, easier, and more glamorous. However we as Christians should always remember that Jesus never promised that being a disciple would be easy, in fact we must deny ourselves take up our cross and follow him. We should make up our minds whether we want to be a disciple; many people are unable or incapable to make such decisions in life because of addictions to alcohol, drugs, gambling, and solvent abuse. Becoming addicted to any of these can make people lose all sense of reality of right and wrong, of what being a Christian really means. If a person is not in total control of their life then being a Christian is almost an impossible task. The family is an extremely important unit and source of Christian discipleship in our society, it is within the family that children first learn about the love of God, right and wrong and acceptable and unacceptable modes of behaviour. Parents are the first teachers of their children and the church relies on these parents to pass on the faith to their children by what they say and through their actions. There are many broken families in todays society and many children do not receive the Christian teaching and example, which they need, such as love and understanding and therefore grow up not using the example in their life. So to be a good disciple is extremely difficult but not impossible. In todays world there are many distractions and other Gods, which can lure us away from love of the one true God. Things such as money, possessions, wealth, search for pleasure, and success, laziness, indifference, friends, and Greed. These things all tempt us in many different ways, it is as if they are trying to make us forget our first priority which is God. The easier route in life is often to give into these temptations, to become distracted by worldly and materialistic values and to become neglectful to our Christian duties. If we consider all the pressures people today face we see that it is not always an easy task to follow Jesus through thick and thin, but it is not an impossible one. When Jesus chose his first disciples he knew that it would not be easy for them, nor is it easy for us in the twentieth century. The world as we know it is becoming less and less accommodating to the Christian way of life and it is not going to get any easier, this is why we should never give up and our faith should see us through even the worse times in life. We should not become what society wants to become and is encouraging us to become we should not be lured away from God so we can fit in and act like people want us to. This is the challenge of Christian discipleship.

Tom Stoppards Arcadia Essay -- Arcadia Tom Stoppard

Throughout the text, Tom Stoppard's novel Arcadia makes a series of philosophical statements regarding the theme of determinism. These statements are developed largely through images and completely different time periods, particularly those of the Romantic and Enlightenment era ¹s. Tom Stoppard uses the theme of determinism to show how the ideas of the Romantic era and the present day have gone in a circle. And that even though we get more and more advanced everyday, Stoppard shows us that despite our constant advancement, our basic ideas have remained unchanged. Author Tom Stoppard portrays this belief of a time cycle through the image of the apple juxtaposed with the image of the garden.   Ã‚  Ã‚  Ã‚  Ã‚  In Arcadia, Tom Stoppard uses a scientific view of determinism along with a religious view on determinism in order to allow the reader to see similarities in ideas between the Romantic era and the present day. Religious determinism in Arcadia is shown to have to do with God/fate, predestination, and the future whereas the scientific view has to do with Newton, and with biological determinism. Although both stories do use both aspects of determinism, it is usually the story from 1809 using the scientific determinism whereas in the present day, they use more of the religious view of determinism.   Ã‚  Ã‚  Ã‚  Ã‚  In the first story, a scientific view of determinism is shown through Septimus and Thomasina in order to introduce to the reader the basic ideas on determinism and science.   Ã‚  Ã‚  Ã‚  ...

Profit

1. a. The total explicit cost is $793,000($970,000-$177,000). The total implicit cost is $190,000($175,000+. 15X$100,000). The total economic costs is $983,000($793,000+$190,000). b. The accounting profit in 2010 is $177,000($970,000-$793,000) c. The economic profit in 2010 is $-13,000($970,000-$793,000-$190,000). d. The owner should not leave his job because the economic profit is negative, which means he will earn less if he does his own business. 2. a.The type of agency problem that is involved here is principal-agent problem. Marriott wants to maintain a certain level of quality at all of its hotels, but in order to do that it would require capital investment by franchisees. By investing in the hotels, the franchisees are losing profits. b. I believe that Marriott needs to worry about the quality of all the hotels whether they are owned or franchised. In order to keep customers satisfied and coming back to stay at a Marriott they need to keep a good reputation. c.Marriott would t end to own its hotels in resort areas because the people will be more focused on the quality and upkeep of the hotel itself. By Marriott providing good quality in resort areas it will help them gain more business in downtown areas due to the customers’ previous experience. In downtown areas it is also more difficult to find a high quality hotel. If people do not have a good experience at a Marriott then the next time they need to stay in a hotel they will travel further down the street to a different hotel due to the poor quality of the previous Marriott stay.The reputation of the Marriott depends highly on how much business it will have. A good reputation will lead to great profits. 3. a. I would expect the price of wine to decrease as well. b. I would expect the price of wine to decrease because the quantity demanded for wine will increase. c. I would expect the price of wine to decrease as well because the quantity demanded will increase due to people having a job and maki ng more money. d. I would expect the price of wine to decrease.A rise in the price of cheese will decrease demand for cheese, which should decrease demand for wine which in turn will decrease the price for wine. e. I would expect the price of wine to increase due to the increase in prices of the wine bottles. f. I would expect the price of wine to decrease since it will be cheaper to produce. g. I would expect the price of wine to decrease. h. Since older people drink less wine, demand would be falling in this case. As a result, the price would decrease. 4. a. 5.I believe that the equilibrium price of products gaining a presence on the Internet will increase because the quantity demanded will be higher and the equilibrium output will also increase. Since it will be new to the internet the demand will increase which will make the price increase as well. 6. MC=MR 1000-10P=40P 50P=1000 P= 1000/50 P=20 units (reduction of pollution units) 7. a. MB=MC MC is w=200 and MB from hiring a sec ond worker is MB(2)=(30-20)X25=250 TB=(50-20)X25-(200X2)=750-400=350 The firm will hire two guards. b.The benefit from the first guard is: B(1)=(50-30)X25=20X25=500. The maximum payment to the first guard the firm will be willing to pay is $500. c. MC=200 MB(4)=(14-8)x50=6X50=300 TB=(50-8)X50-(4X200)=1300 Therefore the firm should hire 4 guards. 8. a. Price=MC 70=40+0. 005Q; Q=6000 The MR for each unit of output is the same at $70. b. TR=70X6000=$420,000 TC=10,000+(40X6000)+(0. 0025X(6000)^2)=$340,000 Total Profits=$420,000-$340,000=$80,000 c. MR=MC therefore providing one more unit of output will earn $70 and cost $70 so there would be no profit.

Employment and its effects on high school and college students’ grade point averages Essay

Many students, parents, and educators have been seeking the so-called Holy Grail of learning for many decades. One question that has arisen out of this learning model is that of student employment? Many wonder if working a part-time job will affect a student’s grades, and if so, how much? The answer to this seemingly simply question, however, is more complex. A variety of factors must be considered when deciding if and to what extent a student’s grades are affected by his or her employment status. In recent years, the concept of the full-time student seems to be disappearing. From about age sixteen, an overwhelming majority of students, both high school and college, work while they attend school. This average is about 85% for most college students (Bradley, 2006). However, high costs everything from apparel to tuition drives these workers into their part-time jobs which are generally retail and service related businesses for an average of fifteen hours per week (Bradley, 2006). Generally, most studies do identify some differences in academic performance and attitude, but these differences are not as great as people once may have believed. Generally, studies find very few basic differences between working and non-working students, especially in college. However, the intensity of the job and the number of hours worked did seem to affect academic performance in many students at the high school level. Generally longer hours meant more stressors on the individual and had a negative affect on their grades, which translates into about a half of a grade point average(GPA) point lower than not working students or students who work only a few hours, perhaps on the weekends (Weller et al, 2003). Oettinger (1999) also found this to be true, and noted that minority students tended to be more affected by the GPA drop than white students. He noted his drop in GPA to be about . 20 points and to be most obvious in students working more than twenty hours per week. These studies corroborates a study done nearly twelve years earlier in which the researchers found, similarly, that students who put in longer hours at their jobs suffered lower grades, higher absenteeism, and less interest in school in general which was seen in negative behaviors while in school (Perils of Part-time Work for Teens, 1991). At the college level, these differences were less noticeable. Ironically, Bradley (2006) found that the grade point averages were highest for students who did not work AND for students who worked more than twenty hours per week. This seems to contradict the research done on high school students, suggesting that maturity and attitude may also play a part in the employment/grades debate. Research has also been conducted on academic attitude and perception as they relate to grades. In high school, students who worked longer hours did not seem to have much distress about their grades as a result of the employment: â€Å"Those who had jobs displayed no advantage over the others in self-reliance, self-esteem or attitude toward work† (Perils of Part-time Work for Teens, 1991). In addition, students who worked even seemed to report less school stress, possible because they had less interest in school, as mentioned above. Moreover, researchers explain this more blase attitude toward schools by the findings that students who worked were more likely to report avoiding difficult classing, cheating on exams, and copying homework from friends (Weller et al, 2003; Perils of Part-time Work for Teens†, 1991). This was not the case for university students. In college, students who worked perceived that their employment DID affect their grades even when the researchers found little or no interest in grades between non-workers and workers at the college level. Both working and non-working college students showed a high level of interest in their grades and expressed an overall desire to achieve a high level of academic performance. Students who did not work stated that did not do so in order to focus on their studies, and they believed that their studies benefited from this extra time. Again, though, the studies showed no difference in the GPAs of working and non-working college students (Bradley, 2006). Instead many researchers ponder how college students who work so many hours are able to keep similar GPAs to those that do not work. Bradley (2006) suggests that nonworking students may be spending similar time with other activities such as sports, extracurricular clubs, or even caring for dependents at home. He also proposes that the non-working students and the working students may be approaching homework and study in different ways. He notes that non-working students â€Å"may be most likely to adopt a ‘deep’ learning style, characterized by intrinsic interest in the subject content and a desire to maximize understanding of this content† and that working students â€Å"may be more likely to adopt an ‘achieving’ style aimed at maximizing grades through the effective use of space and time. † These learned differences could certainly account for the way different students juggle the demands of work. It is certainly helpful to note when employment can be an effect socialization tool aimed at building strong character and organizational skills and when it can be a definite academic detriment. Research shows that more differences exist for high school students than for college students, and that the majority of the college differences exist only in perception, not in actuality. This gives rise to the possibility of further research which could focus on the characteristics of working students who do keep their GPAs high.

Oprah and Edison essays

Oprah and Edison essays Oprah Winfreys life was far from successful. On January, 29, 1954 Oprah Gail Winfrey was born to teenage parents who werent married. Vernita Lee her 18 year old mother was a housemaid and her father Vernon Winfrey served for armed services at the age of 20. For the first six years of her life Oprah was raised on a farm in Mississippi by her grandmother. Her grandmother taught Oprah how to read at a very young age of three. She started her public speaking at the church reciting sermons. Her grandmother believed in her and constantly said, Youre gifted. At the age of six Oprahs mother decided that she was capable of taking care of Oprah, so she moved with her mother to Milwaukee. She was raped by a cousin when she was nine and later molested by a male friend of her moms and by an uncle. Since she didnt tell anyone about this she rebelled and repeatedly ran away and got into trouble. Her mother couldnt put up with her anymore and was sent to live with her father Vernon. She became pregnant at fourteen and gave birth to a baby boy who was a still born. The death of her baby devastated her tremendously and she vowed to turn her life around. Her father was strict and made her read a book every week and have a report on it. At the age of 19 Oprah had her first job as a reporter for a radio station. Shortly after, she was accepted into Tennessee State University. She studied radio and television broadcasting which she hoped to peruse a career in. During her first year Oprah received several awards including Miss Black Nashville and Miss Tennessee. In 1976, Oprah moved to Baltimore where she hosted a show called People Are Talking. The show was a hit and Oprah stayed with it for eight years. Later after the show stopped she was recruited by a TV station in Chicago to host her own morning show, AM Chicago. The show, ...

Pteranodon Facts and Figures

Pteranodon Facts and Figures Despite what many people think, there wasnt a single species of pterosaur called a pterodactyl. The pterodactyloids were actually a large suborder of avian reptiles that included such creatures as Pteranodon, Pterodactylus and the truly enormous Quetzalcoatlus, the largest winged animal in earths history; pterodactyloids were anatomically different from the earlier, smaller rhamphorhynchoid pterosaurs that dominated the Jurassic period. Wingspan of Close to 20 Feet Still, if theres one specific pterosaur that folks have in mind when they say pterodactyl, its Pteranodon. This large, late Cretaceous pterosaur attained wingspans of close to 20 feet, though its wings were made of skin rather than feathers; its other vaguely birdlike characteristics included (possibly) webbed feet and a toothless beak. Weirdly, the prominent, foot-long crest of Pteranodon males was actually part of its skulland may have functioned as a combination rudder and mating display. Pteranodon was only distantly related to prehistoric birds, which evolved not from pterosaurs but from small, feathered dinosaurs. Primarily a Glider Paleontologists arent certain exactly how, or how often, Pteranodon moved through the air. Most researchers believe this pterosaur was primarily a glider, though its not inconceivable that it actively flapped its wings every now and then, and the prominent crest on top of its head may (or may not) have helped stabilize it during flight. Theres also the distant possibility that Pteranodon took to the air only rarely, instead of spending most of its time stalking the ground on two feet, like the contemporary raptors and tyrannosaurs of its late Cretaceous North American habitat. Males Were Much Bigger Than Females There is only one valid species of Pteranodon, P. longiceps, the males of which were much bigger than the females (this sexual dimorphism may help to account for some of the early confusion about the number of Pteranodon species). We can tell that the smaller specimens are female because of their wide pelvic canals, a clear adaption for laying eggs, while the males had much bigger and more prominent crests, as well as larger wingspans of 18 feet (compared to about 12 feet for females). The Bone Wars Amusingly, Pteranodon figured prominently in the Bone Wars, the late 19th-century feud between the eminent American paleontologists Othniel C. Marsh and Edward Drinker Cope. Marsh had the honor of excavating the first undisputed Pteranodon fossil, in Kansas in 1870, but Cope followed soon afterward with discoveries in the same locality. The problem is, Marsh initially classified his Pteranodon specimen as a species of Pterodactylus, while Cope erected the new genus Ornithochirus, accidentally leaving out an all-important e (clearly, he had meant to lump his finds in with the already-named Ornithocheirus). By the time the dust had (literally) settled, Marsh emerged as the winner, and when he corrected his error vis-a-vis Pterodactylus, his new name Pteranodon was the one that stuck in the official pterosaur record books. Name: Pteranodon (Greek for toothless wing); pronounced teh-RAN-oh-don; often called the pterodactylHabitat: Shores of North AmericaHistorical Period: Late Cretaceous (85-75 million years ago)Size and Weight: Wingspan of 18 feet and 20-30 poundsDiet: FishDistinguishing Characteristics: Large wingspan; prominent crest on males; lack of teeth

Solar Panel Battery Charger 6-12V Research Paper

Solar Panel Battery Charger 6-12V - Research Paper Example The comparator compares the voltage from the battery and acts as a switch for the voltage regulator circuit. Finally, the battery voltage checker checks the voltage of the battery (as it received from the panel) to determine if the battery needs to charge more. The circuit is designed to be simple, efficient and reliable by using easily available field replaceable parts. It uses a 12V, 5W solar panel rated from 100 milliamps to 1A and a lead acid or other rechargeable battery that is rated from 500 milliamp hours to 40 amp hours of capacity. This circuit regulates the voltage flow from the photovoltaic panel to the lead acid battery. It can produce currents up to 150mA. When external pass transistors are added to this circuit, output currents can reach up to 10A. The maximum input voltage to this circuit is 40V (LM723, 2004) with an output voltage adjustable between 2V and 37V. This circuit consists of a series regulator, LM723. ... Figure 11 and Figure 12 are the connection diagram and the datasheet circuit (Voltage regulator, 2012) as below: Figure 11: Connection Diagram Figure 12: Datasheet Circuit The basic building blocks of LM723 are: 1 The Reference Voltage Amplifier 2 The Error Amplifier 3 The Series Pass Transistor. The equivalent circuit of LM723 (LM723/LM723C Voltage Regulator, 1994) is shown in Figure 13 as below: Figure 13: Equivalent circuit of LM723. The main components used in the voltage regulator circuit are (Table 1): Table 1: Main components of the voltage regulator circuit Quantity Component Value 1 LM723 - 1 R1 4.87k ? 1 R2 7.15k ? 2 Transistor 2N3055 1 Diode 1N4007 1 VR 10k ? 1 C1 0.1?F 1 C2 500PF Calculations: Following are the calculations for design and operation of the circuit: Output voltage- Vout = Vref x ((R1+R2)/R2) Where R1= 4.87K, R2= 7.15K and Vref= 7.35V from the datasheet. Vout= 7.35 x ((4.87 + 7.15)/7.15) = 12.36V. Figure 14: Output voltage. Current- The current is establishe d from the Darlington transistor pair in the regulator circuit (Q1 and Q2 in Figure 10). Q1 and Q2 (2N3055) are silicon, Epitaxial-Base Planar NPN transistor mounted in a Jedec TO-3 metal case (Charger Circuit for 6V or 12V Car Battery, 2012) and are recommended for use in power switching circuits, series and shunt regulators, output stages and high fidelity amplifiers. Figure 15 shows the Darlington transistor pair: Figure 15: Darlington transistor pair used in voltage regulator circuit. In this circuit, a voltage of 0.7V is applied to the base (B) of the first transistor (TR1) to switch it on. A current of 300 milliamps passes through the first transistor from the collector (C) to the Emitter (E). The emitter of TR1 is connected to the second