The Early History of Flight

The Early History of Flight   Around 400 BC - Flight in China The Chinese’s discovery of a kite that could fly in the air started humans thinking about flying. Kites were used by the Chinese in religious ceremonies. They built many colorful kites for fun, also. More sophisticated kites were used to test weather conditions. Kites have been important to the invention of flight as they were the forerunner to balloons and gliders. Humans Try to Fly like Birds For many centuries, humans have tried to fly just like the birds and have studied the flight of winged creatures. Wings made of feathers or light weight wood have been attached to arms to test their ability to fly. The results were often disastrous as the muscles of the human arms are not like a birds and cannot move with the strength of a bird. Hero and the Aeolipile The ancient Greek engineer, Hero of Alexandria, worked with air pressure and steam to create sources of power. One experiment that he developed was the aeolipile, which used jets of steam to create rotary motion. To do this, Hero mounted a sphere on top of a water kettle. A fire below the kettle turned the water into steam, and the gas traveled through pipes to the sphere. Two L-shaped tubes on opposite sides of the sphere allowed the gas to escape, which gave a thrust to the sphere that caused it to rotate. The importance of the aeolipile is that it marks the start of engine created movement will later prove essential in the history of flight. 1485 Leonardo da Vinci’s Ornithopter and the Study of Flight. Leonardo da Vinci  made the first real studies of flight in the 1480s. He had over 100 drawings that illustrated his theories on bird and mechanical flight. The drawings illustrated the wings and tails of birds, ideas for man carrying machines and devices for the testing of wings. His Ornithopter flying machine was never actually created. It was a design that Leonardo da Vinci created to show how man could fly. The modern day helicopter is based on this concept. Leonardo da Vincis notebooks on flight were re-examined in the 19th century by aviation pioneers. 1783 - Joseph and Jacques Montgolfier and The Flight of the First Hot Air Balloon Two brothers,  Joseph Michel and Jacques Etienne Montgolfier, were inventors of the first hot air balloon. They used the smoke from a fire to blow hot air into a silk bag. The silk bag was attached to a basket. The hot air then rose and allowed the balloon to be lighter than air. In 1783, the first passengers in the colorful balloon were a sheep, rooster and duck. It climbed to a height of about 6,000 feet and traveled more than one mile. After this initial success, the brothers began to send men up in hot air balloons. The first manned hot air balloon flight was carried out on November 21, 1783 and the passengers were Jean-Francois Pilatre de Rozier and Francois Laurent. 1799-1850s - George Cayley’s Gliders Sir George Cayley is considered the father of aerodynamics. Cayley experimented with wing design, distinguished between lift and drag and formulated the concepts of vertical tail surfaces, steering rudders, rear elevators and air screws. He also designed many different versions of gliders that used the movements of the body for control. A young boy, whose name is not known, was the first to fly one of Cayleys gliders. It was the first glider capable of carrying a human. For over 50 years, George Cayley made improvements to his gliders. Cayley changed the shape of the wings so that the air would flow over the wings correctly. He also designed a tail for the gliders to help with the stability. He then tried a biplane design to add strength to the glider. Additionally, Cayley recognized that there would be a need for machine power if the flight was to be in the air for a long time.

Skill Development Essay Example | Topics and Well Written Essays - 1500 words

Skill Development - Essay Example The essay "Skill Development" talks about the managerial skills development through the analysis of a number of articles and books on a related subject. The process of employee motivation is very significant to any firm. Therefore, in order to get the desired outcomes, it is important to motivate employees for the work they do. This will make them more committed to their work and eventually will lead to high production and good performance. Employee motivation is essential because it ensures that human resource is active in order to accomplish organization goals and objectives. It also leads to the establishment of the friendly relationship among workers. Cooperation in any organization leads to stability and reduces organizational unrest and disputes. Employee development is also an important part that needs to be improved because I discovered that employees display job performance behaviors in part to improve their self-image, especially when their role is not clearly defined in the organization. The effect of these behaviors on managerial reward recommendation decisions should be powerful when managers believe the employees to be more committed to their work. I found out that poor performance could not be attributed to human nature but to an imperfect work system. Managers should realize that employees want self-control, self-direction, seeks and accepts responsibility, thus there was the need to have a strong employee development skill as this would establish a culture of accountability in the organization.

Aerobic Zumba paper for a sports student and linked to a lesson plan Term

Aerobic Zumba for a sports student and linked to a lesson plan - Term Paper Example The microcycle exercises taught here are very beneficial to the general health. Physical exercise can be defined as any kind of bodily activity that is performed to maintain the individual’s physical fitness, the general health and wellness of the person. Exercises are carried out for a variety of reasons for instance weight loss, strengthening of the muscles and cardiovascular system, maintenance and even for the purpose of entertainment and enjoyment. Frequent physical exercise is a booster to the immune system and assists in the prevention of diseases like those related to the heart, cardiovascular system, obesity and certain types of cancer (Woods, 2011, p. 41). Exercise is known to improve the state of mental health and promote and enhance the confidence and self esteem of those who get involved in it. These benefits are discussed in this term paper very exhaustively. The effects of these exercises on the basic skills of the learners and any other person who gets involved in them are also reviewed. This is discussed with the view of enhancing the strength, speed, endurance and coordination of those involved. Exercise indeed makes people feel better, to build in more energy and even live longer live longer lives. The health benefits of carrying out regular exercise and constant physical activity are not easy to ignore. They are beneficial to every individual regardless of age, physical ability and sex. Healthcare providers have often described exercises as a miracle or wonder drug whose capability is very tremendous in preventing diseases where expensive drugs could be used (Kennedy & Yoke, 2009, pp. 294-295). Indeed, exercise is a drug at the disposal of every individual. One chooses to take it or leave it at the expense of social and health well being. The Beneficial Effects of microcycle Exercises One of the beneficial effects of the exercises is that it helps to reduce the size of the waistline. This is very helpful as it tones and strengthens th e entire mid section and also boosts the hips. For the learners to achieve this fundamental benefit, they should perform the exercise of standing with legs hip-width apart and positioning the hands in front of the chest for balance (Alidina, 2012). The right foot then should be stepped on the right side followed by the left foot, and then the body twisted. The same step should be repeated on the opposite side. Exercise can significantly assist in the prevention of excess weight gains. In the same vein, exercise assists in maintaining the weight loss. When one engages in exercise or physical activity calories are burned. When the activity is intense more calories are burned. This has fundamental health benefits and can prevent several diseases that arise from conditions such as obesity. One does not have to set aside huge chunks of time and resource in doing the exercise so as to gain from these benefits. If one feels that it is very hectic to carry out these exercises, he should not worry and feel so left out. It is possible to reap these benefits by getting active throughout the day by doing simple things. Simple ways such as taking stairs instead of elevator, spending some time walking and reviving up the household chores can work out miracles and help those who fear to carry out the actual exercise equally achieve the health benefits associated with such exercises (Kraemer & Fleck, 2007, pp. 120-122). Exercise helps is combating diseases and other health conditions. Those who are worried about health diseases now have nothing to worry about if they can take an active role in carrying out the exercises. High blood

Propolis To Be Selected For Winter Promotion Essay Example for Free

Propolis To Be Selected For Winter Promotion Essay Introduction In coming winter, there will be a special promotion event and a brand of propolis capsules will be selected to present. The aim of this report is to describe the basic information of propolis, show the popularity of propolis and evaluate the advantages and reputation of best seller on market. Firstly the method of research is described, followed by the findings. Then conclusions are drawn and recommendations are made. Methodology Research was conducted to find out the information about propolis. Firstly, table of information about basic information of propolis and research results of evaluation of Comvita Propolis Capsules were conducted by Mr. Tim Burch. Then, websites of two exhibition were visited to get information on Popularity of propolis as a health supplement product. Findings (a) Basic information of propolis According to the table of information, propolis is produced by bee and it is used to build the hives in nature. It is 100% natural substance. Regarding the function, propolis has special power in strengthen and accelerate regeneration of cell as to speed up wound healing. It helps to whiten skin and make skin fine. Besides, boosting immune system is another unique effect of propolis. It contains some anti-allergies like asthma and nasal allergy. Therefore, it helps fight inflammation caused by viruses, bacteria and fungi and lower the chance for other complication occur. (b) Popularity of propolis as a health supplement product Propolis has a board usage as a health supplement product. From the website of MedinePlus(http://www.nlm.nih.gov/medlineplus/druginfo/natural/390.html) shows the following findings. There sufficient evidence to rate effectiveness for Cold sores, Genital herpes and Mouth surgery. Propolis is very popular as it has many medicinal uses today and it presents over the world. From the website of JAFRA(http://www.jafra.gr.jp/eng/propolis1.html)  shows the findings that just in Japan, there are 300 companies are selling propolis health foods and the market is still increasing. Thus, it shows that propolis is very well-received now. (c) Evaluation of Comvita Propolis Capsules Based on research results from Mr. Tim Burch about the best seller on market, Comvita Propolis Capsules. It evaluates this brand of propolis has two major advantages. High purity and flavonoid has found in Comvita Propolis Capsules, it has competitive content of purity and flavonoid than other product. One of the unique features of the product is † additives free†. Comvita Propolis Capsules is a natural product with no artificial colourings lavourings or preservatives. Other than advantages, it has a reputation for honesty and efficiency. There is more than 1000 positive reviews by users on online shopping websites. And Comvita Propolis Capsules becomes the finalist of ‘Product of the Year’ by the Women’s Weekly Health Wellbeing magazine in Australia. It is perceived that Comvita Propolis Capsules is the best seller on market. Nevertheless, the products are not very stable during winter due to the peak consuming season. Pre-order is needed for porduct s supply.

Spousal Testamony against an accused :: essays research papers fc

Dating back to the 16th century, spouses were not deemed to be competent to testify evidence against their spouse. The reasons were a lot simpler than they are today. Anyone with a perceived interest in litigation was deemed to be biased and therefore unfit to testify. Under common law spouses are considered to be one and the same. Since the 16th century the issue of spouse’s and their ability to give evidence against their partners has become more and more complicated. Modern day courts rely more on preserving the sanctity of the marriage than preserving the incompetence standard.   Ã‚  Ã‚  Ã‚  Ã‚  The ability to block spousal testimony does not however apply to all couples under the law. Those in common law relationships are not considered to be one and the same and these spouses’s are able to give testimony about events that occurred during the relationship. Ultimately, because the issue falls under common law the question of whether a husband or wife to can be compelled to give evidence against there spouse was at the justices discretion. Most justices are more likely to compel spousal testimony in cases of violence and domestic abuse. The majority of these offences are committed on a one on one basis with either no one to witness the abuse, or a child incapable of being called as a witness. The testimony evidence of the spouse is often the only proof that an offence occurred. In R. v. McGinty, Justice McLachlin concluded that competence included compellability and added a new policy dimension to the analysis. She observed: â€Å"policy interests favoured compelling testimony in cases of domestic violence. Competence without compellability would more likely [contribute to] family discord than prevent it.† In the matter of appearance, she noted that: â€Å"fair-minded persons generally find it abhorrent that persons who commit crimes go un-prosecuted. The state’s duty to protect the safety of its citizens, underlies the testimonial competence in cases of violence against a spouse, also dictates that the spouse be complellable.† Fundamentally the main factors facing a Justice in their decision is the matter of public safety and the harmony of the marriage. Compelling a spouse to testify against their partner is in direct conflict with that ideology. Therefore divorced or legally separated couples do not fall under this category. In R. v. Bailey it was determined that spousal incompetence does not survive divorce. Justice Morden observed that: â€Å"The modern policy justification for the rule in question is that is supports marital harmony.

Explaining the Concept of Homeostasis Essay

The actual word homeostasis means â€Å"steady state†. Homeostasis describes how the body regulates its process to keep its internal conditions as stable as possible. Homeostasis is necessary because human cells are efficient but very demanding. The phrase homeostasis is a bit confusing; conditions inside our bodies are not constant but are kept within a narrow range. Some factors such as temperature and blood PH change slightly while others such as blood glucose very considerably throughout a normal day without producing any harmful effects. A brief description of homeostasis is that it is maintenance of a constant internal environment in response to a change in external environment. Negative feed makes sure that as levels return to normal, corrective mechanisms are scaled down, it’s when the body maintains conditions within particular limits, and the body will do this by opposing a change that deviates from the normal, core temperature falls. Core temperature rises, d rop detected by hypothalamus. Brain sends signals to the body that brings out shivering and vasoconstriction. Temperature turns to normal. Normal body temperature: 36.9c Rise detected by hypothalamus. Brain sends signals to body that brings out sweating and vasodilatation. Negative feedback comes when an important variable, sometimes known as a key variable such as the pH of blood and tissue fluid.Homeostasis is the process of maintaining a constant internal environment in response to changes in the external environment. Homeostatic mechanisms are for regulating; body temperature, blood glucose, heart rate and breathing rate. Regulating the internal environment of a human is achieved by negative feedback; this is a constant process. Conditions within the body changes and receptors detect that change; receptors are found in the skin, around vital organs and the hypothalamus. This information of change that is detected by the receptors are then passed to the control centre in the hypothalamus which monitors the changes, when the change in environment fall too far outside the normal range of values the negative feedback response begins. The control cent re signals an effecter to take  action that will return the system back to its ‘normal’ state. An example of homeostasis taking place is when a human goes into a cold environment, conditions change internally; the skin, a receptor will detect the change and cold blood will pass to the control centre, hypothalamus. The hypothalamus then monitors this change and signals the effectors if the internal environment goes below minimum core temperature for cells to work properly; thirty-five Degrees Celsius, anything below can be very dangerous. The effectors will heat the body temperature up, making hairs stand up to trap air to create insulation, sweat secretion is reduce so less cooling of the body and blood vessels constrict which reduces the amount of blood near the surface of the skin so the blood can heat up. All of these effectors enable the human body to go back to its normal state. The opposite example of this is if a human does exercise, every time the muscles, receptor contract, energy is produce which is transformed into heat. Heat from muscles then moves to the blood which circulates throughout the body which makes temperature rise. When you are exercising different changes occur in the body to try and deal with the change in the environment and the reaction that occurs in the body. I will also explain the homeostatic mechanisms when someone exercises. Homeostasis is for the process of the body to maintain a relatively consistent internal state. The nervous system sends and receives signals about temperature, hydration, blood pressure and much more factors. The endocrine system carries chemical messengers to adjust bodily functions. During forms of exercise, the body’s internal environment is altered and placed under a considerable amount of stress. Through homeostatic feedback mechanisms, the body is able to maintain a healthy internal environment and quickly return to normal after exercise ends. These homeostatic mechanisms respond to exercise with changes in the heart rate, respiration, oxygen consumption, carbon dioxide clearance, pulse rate, blood pressure and body temperature. During exercise, the body requires more oxygen and smooth removal of care dioxide. To meet this, the respiratory system responds by changes in breathing rate. The cardiovascular system modifies heart rate, blood pressure and capillary beds to maintain body temperature around 37 degrees and blood pressure roughly around 120/80mmhg. The probable homeostatic responses to changes in the internal environment during exercise  to the heart rate, your body’s working muscles require additional stores of oxygen to help feed their energy requirements. The body receives oxygen from the lungs and transmits it to your muscles through your bloodstream. The heart controls the flow of blood throughout the body and your heart rate is a factor of that flow. D1. Blood glucose  the glucose in your blood (also known as blood sugar, and another form of carbohydrate in your body) can sometimes be used as an energy source to make ATP. During exercise your body prefers to maintain your blood glucose levels by several different actions rather than use it for energy. Actions such as increased levels of epinephrine, glucagon and cortisol that get released in your body during exercise act to maintain your blood glucose levels through special pathways in the liver and also encourage your muscles to use more glucose (which is good because you can keep working out!). Sometimes though, if you fail to eat correctly before your workout or have low muscle glycogen levels (because you’re not eating right in the several hours after exercise), you may experience drops in your blood glucose levels that make you feel tired, shaky, cold, irritable and unable to exercise any longer. Some of the key factors that dictate if your blood sugars will crash or not include: The timing of your last meal before your workout (when).  The composition of your last meal before your workout (what). How your body responded to food you ate before your workout (how). When and what you ate in the hours following your last workout. If you wait too long after your last meal or snack to exercise, you’re more likely to experience drops in your blood sugar levels because they’re already feeling weak and require food to be maintained. This results in a major drop in exercise performance. If somebody remains in the cold temperatures for a long period of time, the thermostat homeostasis mechanisms may fail and you could develop hypothermia. Hypothermia is when your body temperature drops beyond below the standard temperature needed for your body to function accurately without any inner body catastrophes. When your body temperature reaches a certain point below the norm, usual actions can’t work, including homeostasis. When your body is put in a certain situation for too long your internal environment may begin to shut down, leaving your body vulnerable. Unless immediate action is taken to bring the homeostasis back to normal you will die. The same thing would happen if your body was exposed to extreme heat for any long periods of time. For the metabolic system to continue to occur in the body cells need a constant supply of glucose. Glucose is a carbohydrate, and is the most important simple sugar in human metabolism. Blood sugar levels should be maintained at around 90mg of glucose per 100ml of blood. If blood glucose levels rise, insulin is released into the blood. Insulin is one of many hormones that help the body turn the food we eat into energy. Also, insulin helps us store energy that we can use later. After we eat, insulin works by causing sugar (glucose) to go from the blood into our body’s cells to make fat, sugar, and protein. When we need more energy between meals, insulin will help us use the fat, sugar, and protein that we have stored. Insulin is produced by our own insulin that is made in the pancreas gland or taken by injection.

The Socialization And Dilution Of Marxist Theory Essay

The Socialization and Dilution of Marxist Theory in the Post-WWII Era In Antonio Gramsci’s â€Å"Hegemonic Theory† in The Prison Notebooks, the Neo-Marxist ideology of cultural and social monopolies is the underlying source of bourgeoisie corruption and economic dysfunction. Gramsci‘s view of capitalist fascist ideology had failed to understand the complexity of capitalism as a system that dominated academia, the mass media, and other forms of institutionalization that co-opted Marxist leftists movements in the economic booms of the 1970s and 1980s: An analysis, for instance, of how the conservative regimes of Margaret Thatcher in England and Ronald Reagan in the United States in the late 1970s and early 1980s won power would dissect how conservative groups gained dominance through control of the state, and the use of media, new technologies, and cultural institutions such as think tanks and fund-raising and political action groups (Kellner, 2005, p.6). In this theory, Gramsci defined the social and cultural aspects of education, mass media, and other cultural forms of â€Å"think-tank† operations led by elites in the capitalist classes, which negates the underlying power of capital that simply purchased these ideologies and moderated them for the benefit of the bourgeoisie. Gramsci’s Neo-Marxist ideology shows the variability of social and cultural forces, which denies the economic materialism of Marx’s underlying lying theory of ownership, production, and propaganda generated byShow MoreRelatedThe Bankruptcy Of Marxist Ideology : The Dilution And Variability Essay1720 Words   |  7 PagesTopic 4: The Bankruptcy of Marxist Ideology: The Dilution and Variability of Marxist and Neo-Marxist Theory in the Post-WWI Era Introduction: This economic study will define the dilution and variability of Marxist and Neo-Marxist Theory in the post-WWII era. The slow dissolution of Marxist theory as as a 19th century economic concept defines the rise of capitalism and the neoliberal ideology that has permeated the latter half of the 20th century. The fall of communism in the late 1980s revealsRead MoreOne Significant Change That Has Occurred in the World Between 1900 and 2005. Explain the Impact This Change Has Made on Our Lives and Why It Is an Important Change.163893 Words   |  656 Pagesmacrostructural conditions shape migratory flows and shift destinations, see Moya, Cousins and Strangers, 80–88. 56. For critiques of national perspectives, see Hasia Diner, â€Å"History and the Study of Immigration: Narratives of the Particular,† in Migration Theory: Talking across Disciplines, ed. Caroline Brettell and James Hollifield (New York: Routledge, 2000), 27–42; Donna Gabaccia, â€Å"Is Everywhere Nowhere? Nomads, Nations, and the Immigrant Paradigm of United States History,† Journal of American History