Free Essays on An Overview Of SRBs And Their Application In A Shuttle Launch

Have you ever seen a spaceship before launch? If you so I’m sure you have noticed the two cylindrical objects with the cone tops mounted on the side of the space shuttle. Those are Solid Rocket Boosters (SRBs). SRBs are very useful to do many tasks. Not only does NASA use the technology of SRBs, they are used every where, even a long time ago. Did you know that SRBs were the first engines created by man? They were invented hundreds of years ago in China and have been used ever since. Even in the National Anthem the line about "the rocket's red glare" is talking about small military SRBs. Let’s have a look at how these SRBs got to be so useful and how they are made. The idea behind a simple SRB is straight forward. What you want to do is create something that burns very quickly but does not explode. As you are probably aware, gunpowder explodes. It is because of there innate properties SRBs are very safe, with a low cost to produce and relatively simple. In a small model rocket engine or in a tiny bottle rocket the burn might last a second or less. In a Space Shuttle SRB containing over a million pounds of fuel, the burn lasts about two minutes. Also since it is a chemical reaction there is no way of stopping it from burning once it has started. The composition of most common SRBs are a combination of: ammonium perchlorate (oxidizer, 69.6 percent by weight), aluminum (fuel, 16 percent), iron oxide (a catalyst, 0.4 percent), a polymer (a binder that holds the mixture together, 12.04 percent), and an epoxy curing agent (1.96 percent). Along with the main load of fuel the space shuttle SRBs have an onboard recovery system, parachutes, floatation devices, signaling devices, and explosive charges for separation. The SRBs mentioned above provide most of the thrust (71 percent) needed to lift the space shuttle off the launch pad. This seems like an easy task, but it’s not easy getting something that big off earth. Letï ¿ ½... Free Essays on An Overview Of SRBs And Their Application In A Shuttle Launch Free Essays on An Overview Of SRBs And Their Application In A Shuttle Launch Have you ever seen a spaceship before launch? If you so I’m sure you have noticed the two cylindrical objects with the cone tops mounted on the side of the space shuttle. Those are Solid Rocket Boosters (SRBs). SRBs are very useful to do many tasks. Not only does NASA use the technology of SRBs, they are used every where, even a long time ago. Did you know that SRBs were the first engines created by man? They were invented hundreds of years ago in China and have been used ever since. Even in the National Anthem the line about "the rocket's red glare" is talking about small military SRBs. Let’s have a look at how these SRBs got to be so useful and how they are made. The idea behind a simple SRB is straight forward. What you want to do is create something that burns very quickly but does not explode. As you are probably aware, gunpowder explodes. It is because of there innate properties SRBs are very safe, with a low cost to produce and relatively simple. In a small model rocket engine or in a tiny bottle rocket the burn might last a second or less. In a Space Shuttle SRB containing over a million pounds of fuel, the burn lasts about two minutes. Also since it is a chemical reaction there is no way of stopping it from burning once it has started. The composition of most common SRBs are a combination of: ammonium perchlorate (oxidizer, 69.6 percent by weight), aluminum (fuel, 16 percent), iron oxide (a catalyst, 0.4 percent), a polymer (a binder that holds the mixture together, 12.04 percent), and an epoxy curing agent (1.96 percent). Along with the main load of fuel the space shuttle SRBs have an onboard recovery system, parachutes, floatation devices, signaling devices, and explosive charges for separation. The SRBs mentioned above provide most of the thrust (71 percent) needed to lift the space shuttle off the launch pad. This seems like an easy task, but it’s not easy getting something that big off earth. Letï ¿ ½...

Funny Images Conjured up by Web Comments

Funny Images Conjured up by Web Comments Funny Images Conjured up by Web Comments Funny Images Conjured up by Web Comments By Maeve Maddox Sometimes Im more amused than annoyed by spelling errors and incorrect word choices that I see in blogs and comments. Here are a few. Let your imagination soar! 1. Looking for a laptop for my mother she only needs a bear-bones laptop. 2. Someone said this to me one time and I balled my eyes out. 3. his scarlet bishops cossack and cap. 4. The boy [who had been beaten] had whelps on him. 5. He hears a disemboweled voice. 6. The cowboy was rounding up the doggies. 7. The crust of my interest is World War I. 1. bare-bones adjective meaning essential. a laptop with only the most essential features. bear-bones the skeletal structure of a bear (an animal of the family Ursidae). 2. balled formed into a ball. We can speak of a balled fist. Yarn can be balled, as can little bits of wool on a sweater. bawled past tense of bawl, to cry out loudly. The word may come from an Icelandic word for the sound cattle make. Related to bellow. 3. Cossack originally a member of a Russian military elite; a distinctive item of their uniform was a tall fur hat. Figuratively, a cossack is an authoritarian figure that uses any type of force to control others. The character Chekov in the original StarTrek series was fond of calling people he didnt like cossacks. A cassock, on the other hand, is a clerical garment, a long close-fitting tunic reaching to the feet. This is what the bishop probably had. 4. A whelp is the young of a carnivorous animal, such as a wolf cub or puppy. The word called for in this context is welt. welt: a raised area, ridge, or seam on the body surface (as from scarring or a blow). 5. disembowel: to take out the bowels of, eviscerate. This is what the word drawn refers to in the expression hanged, drawn, and quartered. The word this writer was reaching for was disembodied. disembodied in this context means that a voice was heard, but its source could not be seen. 6. doggies a childs word for dogs. Ex. Look at the Mother Doggy and all the little doggies! dogy (also spelled dogey and dogie) a motherless calf in a range herd. 7. crust the hardened exterior of something. It could be a pie crust or the earths crust. The speaker probably intended to say crux. crux a word derived from the Latin word for cross. A cross, as we know, can be a tool of torture and execution, but its shape is also suggestive of a central nexus, like a crossroads. Both ideas contribute to the meanings of the English word crux: 1 a. a puzzling, confusing, or difficult problem : an unsolved question b. a determinative point at issue : a pivotal or essential point requiring resolution or resolving an outcome 2. a main or central feature (as of an argument or plan) Please share your own examples of misused words that conjure up funny images. Want to improve your English in five minutes a day? Get a subscription and start receiving our writing tips and exercises daily! Keep learning! Browse the Misused Words category, check our popular posts, or choose a related post below:5 Uses of InfinitivesLatin Plural Endings30 Words for Small Amounts

Cash for Grades Research Project Essay Example | Topics and Well Written Essays - 1500 words

Cash for Grades Research Project - Essay Example Long-term, cash for grades programs are not effective and do not produce the desired educational outcomes which schools hope they will. â€Å"Paying students to behave is totally immoral. How will kids react when the money stops?† (Gill and Lam, 7). This is a good point which reinforces the idea that these programs are not effective long-term. Local high school and university budgets are strained, especially during times of economic difficulty, therefore supporting these programs indefinitely would not be possible from the budget viewpoint. There is bound to be an emotional reaction in students when these programs can no longer be supported which could actually de-motivate students to learn. Therefore, short-term they definitely can motivate students to achieve higher test scores or to absorb class materials, however long-term there are too many potential negative outcomes. These would be expensive programs, especially if, short-term, these programs motivated students to achieve very high grades so that a higher percentage of students achieved A grades. The end result of ending these programs due to budget problems could cause serious academic learning problems with students who had become accustomed to this added incentive. On a different note, the achievement gap between rich and poor students exists because of the quality of life differences for each socio-economic group. In psychology, Abraham Maslow identified a hierarchy of needs, common needs shared by all people in society, which identify physiological needs as the most primary (Weiten and Lloyd, 2005). Physiological needs include shelter, clothing, food and other basic life essentials. Maslow offers that people cannot achieve any greater contribution to becoming a better member of society until these basic needs are satisfied. People with higher economic means do not concern themselves as much with

Strategic Choice and Evaluation Paper for Garmin Company Essay

Strategic Choice and Evaluation Paper for Garmin Company - Essay Example Despite of that, the company needs to bring in some more products through the grand strategy called as â€Å"Product Development†. This strategy will not only enhance the product breadth of company but will also support in competing with major rivals as well as creating a sustainable position in market. The process of Product Development must be conducted by taking assistance from another grand strategy which is widely implemented by electronic companies today. This strategy is called as â€Å"Innovation† strategy. Garmin Co. must utilize the best available technology in order to manufacture the best quality of electronic products. The company can also transform its innovation strategies to its competitive edge. In this manner, it would be difficult for competitors to compete with Garmin and it can also direct the company to the position of market leader in a period of next 10 to 20 years. Garmin possesses an innovative mind-set as well as all the required resources in order to pursue its business and compete with its competitors. It is important for Garmin to examine the ways through which it can bring in new products in an innovative manner (Feather, 2010). The above mentioned two grand strategies are recommended because in order to compete with intense competition, Garmin needs to pursue the competition by providing better products and services. After a complete range of products has been established, Garmin should remain consistent with its quality and pricing so that it can retain its customers. This idea will not only help Garmin in building up its brand image but also will generate substantial revenues that would assist the company in long

Harmful Effects of Mobile Phones on the Body

Harmful Effects of Mobile Phones on the Body MOBILE PHONE HARMNESS ON HUMAN BODY Abstract:- Mobile Phone usage has been rapidly spread globally and to provide proper coverage (signal strength), numbers of cell towers are also increasing worldwide generating a public concern as to whether frequent utilization of such devices is unsafe. Effects of Mobile Tower Radiations are seen in many countries. So, in this paper, we have discussed Mobile Tower Radiations Harmness on Human Health. Keywords: Mobile Tower Radiations, Electromagnetic Radiations, Signal Strength, Mobile Phone I. Introduction:- Forty years ago today, Motorola engineer martin cooper-credited as the inventor of the cell phone made the world’s first public cell from a mobile phone. In 1984, the U.S. federal communications commission approved Motorola’s Dyna Tac phone for public use. In 1993, Bellsouth and IBM announced their creation of the Simon personal Communicator phone, touched as the world’s first smart phone. In 2002, the first phones with built-in cameras became publicly available, including the Nokia 7650 and the Sanyo SPC-5300. In January 2007, Apple launched its first phone. The company into one handled devices, a mobile phone, an i-pod and a wireless communication device. II. Mobile Technology for increased Productivity and profitability:- The demand for access to business information and applications through mobile technologies such as the Apple i-phone and i-pad device running google Android and windows 7 mobile or using RIM BlackBerry. Mobile technology allows people to use company data and resources without being tied to a single location. Mobile IT Device can also change the way your company does business new technologies lead to new way of working and new products and services that can be offered to your customers. They can make your team more efficient, more creative and more valuable to your clients. Mobile Technology can be used to increase their productivity and lead to increased profitability. Below are some of the key areas in which mobile technology can be useful. Networking/ communication Development Marketing Mobile ticketing Mobile vouchers and coupons and loyalty cards Content purchase and delivery Location based services Information services Mobile Banking Mobile or cellular phones are now an integral part of modern telecommunications. In many countries, over half the population use mobile phones and the market is growing rapidly. At the end of 2009, there were an estimated 4.6 billion subscriptions globally. In some parts of the world, mobile phones are the most reliable or the only phones available. Mobile phones communicate by transmitting radio waves through a network of fixed antennas called base stations. Radiofrequency waves are electromagnetic fields, and unlike ionizing radiation such as X-rays or gamma rays, can neither break chemical bonds nor cause ionization in the human body. Cell phones and cell phone towers send signals using radio frequency (RF) energy, or radiation, just like radio, television, pagers and other wireless communication devices. Many people have asked whether the RF energy from cell phones and cell phone towers is safe. III. Radio Frequency Energy: RF energy is another name for radio waves. Probably the most important use for RF energy is for communication services. Radio and TV broadcasting, cell phones, pagers, cordless phones, and satellite communications are just a few of the many communication uses of RF radiation.A microwave oven is an example of a non-communication use of RF radiation. Radio frequency energy is a form of electromagnetic radiation. Electromagnetic radiation can be categorized into two types: ionizing (e.g., x-rays, radon, and cosmic rays) and non-ionizing (e.g. radio frequency and extremely low-frequency or power frequency). The potential health effects of non-ionizing radiation from radar, microwave ovens, and other sources, there is currently no consistent evidence that non-ionizing radiation increases cancer risk. Exposure to ionizing radiation, such as from radiation therapy, is known to increase the risk of Cancer. IV. Effects of radiation energy of mobile phones on human health: Thermal effects:- One well-understood effect of microwave radiation is dielectric heating, in which any dielectric material (such as living tissue) is heated by rotations of polar molecules induced by the electromagnetic field. In the case of a person using a cell phone, most of the heating effect will occur at the surface of the head, causing its temperature to increase by a fraction of a degree. In this case, the level of temperature increase is an order of magnitude less than that obtained during the exposure of the head to direct sunlight. The brains blood circulation is capable of disposing of excess heat by increasing local blood flow. Non-Thermal effects:- An effect which can only be explained in terms of mechanisms other than increased molecular motion (i.e. heating), or occurs at absorbed power levels so low, that a thermal mechanism seems unlikely, or displays so unexpected a dependence upon some experimental variable that it is difficult to see how heating could be the cause. Cancer: Studies on cancer in relation to mobile telephony have focused on intracranial tumors because deposition of energy from RF fields from a mobile phone is mainly within a small area of the skull near the handset. When whole body exposure is considered, as in some occupational and environmental studies, also other forms of cancer have been investigated. V. Do mobile phones harm brain tissues and cause cancer? There is an argument that mobile phone causes change in the structure of chemicals of cells. Also, they are accused of causing cancer. The radiation from the mobile phones has been villainized by those who warn that the excess usage of mobile phones can damage brain cells. The heat produced by the radiation from mobile phones has been found to change the chemical structure of chemicals synthesized in small organisms like worms. But many scientists are of opinion that the radiation cannot be harmful to human tissues. A recent report says that so far there is no evidence of any adverse effect by mobile phone radiations, but they added that new researches have to be conducted. Recently, I have observed some serious effects ofmobile phone radiationon brain. In brain, hippocampus is understood to be responsible for learning and memory. In order to confirm this, we have carried out investigations on the whole brain, hippocampus, and remaining brain. This was undertaken to determine the possible site of the electromagnetic field (EMF) bio-interaction. We have concluded that these radiations may damage our nervous system, especially memory. This has been done by protein kinase C activity and DNA strand break, which has been affected by mobile phone radiations. Anyway it is better to prevent kids fromusing mobile phonesexcessively because their brain tissues are more vulnerable to chemical changes and cancer if exposed to radiation. When you try to call someone through mobile phone, do not put your mobile closer to your ears until the recipient answers. Because directly after dialing the mobile phone, it would use its maximum signaling power, which is 2 watts which is equal to 33 dbi. Please be careful. Message as received (Save your brain. Please use your left ear while using cell (mobile), because if you use the right one, it will affect the brain directly. This is a true fact from many researches performed by the medical teams around the world. VI. Advantages and Disadvantages of Mobile Phone Effect: As time passes by technology are growing faster and move faster. The most important and common part of technology in our life is mobile phone technology. We bring mobile phone with us in everywhere that we go and use it on a daily basis. It is being the part and parcel of our daily life. Mobil phone have been around for quite some time, but as time goes on, mobile phones continuous to gain many features. A mobile phone started out as simple device that had only numbers, and most people used them for emergencies only. Nowadays, cell phones have many features such as phone calls, text messaging, taking pictures accessing the web, using calculator etc as many accessories. People become addicted in cell phone because they are getting many facilities by using it. For example whenever they go outside they can take the phone with them because of its size, networking range, a full charge battery, essay connection etc. There is no doubt about the benefits of mobile phones. Mobile phones have so many advantages but there have some disadvantages too. It has become a vital element for every person but nowadays it has also becoming an addiction to the young generation. If we talking about Bangladesh, nine out of ten young people in the town area, have own a mobile phone. They use it in various purposes. Their attraction of mobile phone is increasing day by day. Medical science says that the radiation of mobile phone is too bad for human health. In 1995 mobile phone has introduced to Bangladeshi people. The first mobile service provider company was City cell. Then Grameenphone, Aktel, Banglalink, Teletalk, and Warid which is being named as Airtel an Indian telecom company who has also started their business in Bangladesh. In the arena of communication mobile has becoming the latest fashion and also the most essential means of communication. These mobile phones let us enjoy all the comforts within a single device. VII. A few tips on how to avoid radiation from cell phones: At your workplace or office, there should be strict screening of calls. Use voicemail regularly when working on something from which you do not want to be disturbed. When responding back, it helps to collect the thoughts and speak just how much is required. People who attend a lot of teleconferences should use a wireless headphone cum mike. It is easier than the headset on the ears which one has to keep pressed to the ear, especially since the meetings may go on for hours. At home, turn on the loudspeaker, so there is not much of a problem for the ears and brain. While traveling, use earphones. Keep mobile phones a few feet away from your body while sleeping. Do not talk for too long on your cell phone. Short calls will avoid unwanted radiation and also you will save money on calls. VIII. Result:- Analyses shows that mobile radiations effect human brain and GSM operated mobile phones has the higher effect on brain activity as compared to CDMA operated mobile phones. Globalization is the new mantra. In this age, it is very difficult not to have technology. But as shown in this study, with every technology invented to facilitate human beings, there come certain hazards. Electromagnetic radiation is everywhere. More and more wireless communication services are expected, so is the artificial electromagnetic radiation. It seems that there is no way to reverse this trend. Scientists and engineers must develop better and safer wireless systems and devices. Smaller cell size, better base station antennas and other more advanced technologies will allow future cell phones to radiate much lower power and make technology a real boon. Conclusion: The use of cell phone is increasing tremendously day-by-day but most of the people (who use cellular phone) have no knowledge how the cell phones impact on human health. It is almost clear from the research that the radiation from cell phone is responsible for many diseases like brain tumor, headaches, short-term memory loss, different types of heart diseases etc. In the presence of various RF sources, including cell phone handsets and broadcast antennas which contribute the overall environmental exposure has become a great concern about safety of this new technology and as well as human health. However we should contribute more efforts to transform mobile radio communication to an efficient, secure and convenient system useful for the welfare and positive advancement global society and for this the Government should take necessary steps for the mobile industry with proper regulation.

Examinations. Good or Bad? Essay

Examination is a very wide word, which is used in all spheres of life. It is the most feared word of many students. We have examinations everywhere around the world. In Singapore, students take examinations every few months and major examinations every few years. As a result, many parents often push their children to strive in examinations. This causes them to feel extremely pressured as they have to juggle extra co-curricular activities that are compulsory in Singapore’s education system as well as to ensure that they do not neglect their studies and to meet their parents’ expectations. They often end up burning the midnight oil when there are examinations, leaving them worn out. Hence, the majority of students in Singapore feel that exams should be abolished. However, examinations are also proven to be beneficial. They help observe if we were able to consolidate what we have learnt and it has given students the drive to study. Without examinations, do you think a stud ent will spend time revising? Clearly, examinations should not be abolished. Examinations have given students the drive to study. As many parents expect their children to pass with flying colours during examinations, they usually will push them to study, hoping that by doing so they will get good grades. Sending them to tuition classes or even taking time off work to help them with their studies are ways parents will push them to work hard. As many parents always tell their children, â€Å"getting good grades will get you a good job†. By doing so, students will have to put in effort into their studies and do frequent revision which helps them to understand better. Should examinations be abolished, students will not be motivated to study and do revision. Without revision, there is no point in having classes as one will not learn and remember everything being taught. Students will then laze around and waste unnecessary time which could have been used for revision which will be beneficial to them. Not only do examinations give students the drive to study, they are also used to evaluate students. It is important for schools to evaluate how well students can consolidate the material presented to them, as otherwise the teachers might have explained everything in class in vain. The evaluation based on the grades taken in exams can help the teachers see what the students’ mistakes are and what misconceptions they may have and the teacher can correct them. Moreover, it helps them to see the students’ areas of  strengths and weaknesses and ensure that the teacher is able to maintain their strengths and improve their weaknesses. Hence, students will be able to learn better and it is no doubt that examinations are helping the students. Some people point out that examinations cause a large amount of stress to many students. Admittedly, students tend to feel extremely pressured when they hear the word â€Å"examinations†. This is because they are being pressured to meet their parents’ expectations by studying extremely hard, and sometimes, even burning the midnight oil. While doing so, they also have to attend extra co-curricular activities as well as to attend ballet classes, piano classes, tuition classes, and many more. However, if students learn to manage their time properly, I do not see why they should feel stressed. By completing their homework and revision on time and by drawing out timetables, there should not be a problem when it comes to dealing with examinations. Moreover, instead of doing last-minute revision, they could have done revision every day after school. This way, they will not panic. Furthermore, if students do not waste unnecessary time lazing around and playing video games, ther e should not be a problem with not completing their revision on time. Additionally, stress helps boost brain power as well as create mental toughness, increase clarity, and it helps in greater appreciation for one’s circumstances, and contribute to a sense of confidence built on a history of overcoming of obstacles. Hence, when it comes to examinations as a whole, the good outweighs the bad. All in all, examinations have been beneficial to many people.

Literary Elements in The Wrysons by John Cheever Free Essay Example, 1000 words

The paper explores detail as one of the literary elements of The Wrysons . Details may either be used to deepen the impression of the scene or to bring some contrasting object/situation into the setting. Cheever s writing is rich in details due to its connection to place (a quiet suburb with upzoning at the front of all troubles) and the nature of the conflict (it s a merely psychological conflict coming from the inner traumatic fixations of the characters on some situations). Details are often ironic, such as garlic smell in the description of an unknown foreigner cited above. Nevertheless, the author often uses them as a sign of disorder, of some sad or terrifying event. The medicine cabinet is the detail that cumulates the disastrous atmosphere in Irene s dream: She opened the medicine cabinet, the one place in the house that the Wrysons, in their passion for neatness, had not put in order (Cheever 319: par. 4). The cabinet contains medication for Irene s daughter, pills and po tion bottles had been being stuffed there for years. Mother opens this place just in the apotheosis of the disaster in her dream just to find out that in this emergency place, there is also a disorder. We will write a custom essay sample on Literary Elements in The Wrysons by John Cheever or any topic specifically for you Only $17.96 $11.86/page Its sweetness (that makes it a sensual detail), its predestination to be thrown away convey the mood of both main characters. When the cake gets burned, they feel free from the sweet web of their illusions. However, as a cake is not a pathetic detail, the reader gets free also by the very ironic and yet sympathizing tone of the story.