Wednesday, January 29, 2020
Physics project Maglev Trains Essay Example for Free
Physics project Maglev Trains Essay Maglev trains are the means of transport clear – cut for the rapid and modernised society of the 21st century. With top speeds of 500 km/h the maglev trains can travel as fast as passenger aircrafts for a lower cost and with minimal impact to the environment. They are in fact possibly one of the best discoveries and one of the most promising sector in the future travel industry. The Laws of Physics The Maglev train is based on – 1. Magnetism – When two sets of magnets, one on the guide way and the other on the train have like poles facing each other repulsion takes place. It is this repulsive force that drives the train forward. 1. Electromagnetism – The magnets used are no ordinary magnets – they are electromagnets. A solenoid is made using wires and an aluminium core. When current flows through the wires the magnet is magnetised. The speed of the train can be controlled by the amount of current being supplied to the electromagnets. How is magnetic levitation achieved? There are two ways to levitate the train – 1. Electromagnetic suspension where electromagnets on the train body get attracted to the iron rails. After this, constantly switching the electromagnets on and off at a fast rate allows the train to levitate 2. Electro-dynamic suspension where the magnetised coil running along the guide way repels the magnets on the undercarriage of the train. Both these techniques allow the train to levitate 1 to 10 cm above the ground and give the feeling it is floating in air. How are Maglev trains propelled? Once the train has got levitated power is supplied to the coils in the guide way walls to create a unique system of magnetic fields that pull and push the train. The current supplied is AC, alternating current, and thus it keeps alternating to change the polarity of the magnetised coils. This ensures that any one time the magnets behind the carriage are repelling it to push it forward while the coils in front are attracting it, pulling it forward. This push and pull occurs simultaneously. The Newest Technology Maglev trains regularly reach speeds of 500 km/h since they do not need to resist friction. The only resistance is air resistance. This too can be overcome by building vacuum tubes through which these trains would travel and theoretically speaking such trains could even reach speeds such as 3500 km/h making inter – continental travel possible. Performance Comparison Maglev trains are much more efficient than common trains which run on fuel. Firstly, they are faster since they do not deal with friction. Secondly, they are cheaper since no fuel is burnt during the propulsion and minimal electricity is used since only certain parts of the track need to be energised at one point. Thirdly, it is safer since there is no chance of collision or derailment or at least a very minute chance compared to common trains. Lastly, these trains are much more environmentally friendly since they do not pollute the environment by releasing any toxic gases unlike common trains which do so. Bibliography Information Source The Guide Way and the Undercarriages http://science. howstuffworks. com/transport/engines-equipment/maglev-train. htm Future of Maglev Trains http://www. bbc. com/future/story/20120504-the-floating-future-of-trains How do Maglev Trains Levitate? http://www. lanl.gov/orgs/mpa/stc/train. shtml History and Introduction to Maglev Trains http://www. 21stcenturysciencetech. com/articles/Summer03/maglev2. html Magnetic Propulsion http://ffden-2. phys. uaf. edu/211_fall2002. web. dir/Adam_Caswell/page%201. htm Image Pg No. Source Maglev.
Tuesday, January 21, 2020
The Stamp Act :: essays research papers
The Stamp Act of 1765 was a tax put on the British American colonies, sponsered by George Grenville and was the first direct tax placed on them. Parliament needed means to help fund expensive costs of keeping troops inside the colonies, so they imposed a tax on all of the colonies everyday printed materials, such as pamphlets and newspapers, and all legal and commercial documents, which all needed to have a certain special stamp placed on it. Many agents of the American colonies that resided in London had suggested other methods to obtain the needed money but where ignored and the Americans where taxed. There were many Americans who did not elect members of Parliament and they greatly opposed the Stamp Act, for two reasons, because they didn't have enough money to pay for them and also it went against their new principle that said, " No taxation without representation." This new tax made many Americans very angered and their actions that came from this started the way towards the American Revolution. There was many forms of resistance, including the king and Parliament receiving many petitions, Americans boycotting the British goods, and printers and lawyers refusing to use the stamps for stamping documents. Another major point is that violence sparked up from the Sons of Liberty, and in New York rioters got so violent that the destroyed a British officer's house because he had said that he "would cram the stamps down America throats at the point of his sword." The Stamp Act Congress was the first conference that held multiple people from several colonies, and was formed of delegates from nine of the thirteen original colonies, which were Massachusetts, Connecticut, Rhode Ilsand, New York, New Jersey, Pennsylvania, Deleware, Maryland, and South Carolina. They met in New York over the dates of October 7th to the date of October 25th, and they created a
Monday, January 13, 2020
Music meter
Appreciating music as the universal language of the soul is more of an instinct and should not be tiring. However, dealing with music formally exposes us to a lot of technical aspects that may appear a little complicated especially for beginners who eventually get exhausted in the learning process. But not all technical issues remain confusing. In music studies, meter is perhaps easiest understood. It is almost an automatic information absorbed by a listener without having to look at a chart or any written guide. The simple hand clap or stomping of the feet acquaints our ears so we can easily follow a tune. Even children can be surprisingly responsive to the music they listen to. Because it is fundamental, learning music meter would not take too much of your time. By simply focusing the mind, one can easily go to the next level. Body Music meter is the arrangement of rhythm in fixed, regular patterns with a uniform number of beats [or pulse] in uniform measures (Dudley et al, pp. 240). At this point, the word ‘timing’ becomes the main concern. Formal musical pieces indicate the meter applied through time signature, which is the fraction number indicated beside the clef symbol at the beginning of the staff or that five horizontal placement lines that hold the notes (Fig 1). The numerator tells us how many basic beats there are in each measure, and the denominator tells the basic duration value of the beat (Dudley et al, pp. 241). It consists of equal divisions and subdivisions translated into counts of 1-&–2-&-1-&-2 (Schmidt-Jones, pp. 3) or ONE two, ONE two (Dudley et al, pp. 241). This depends on the types of music meter used. Fig. 1 The staff, plural form: staves There are actually two traditional patterns of music meter widely used in Western music, the duple, triple, and quadruple, which breaks into simple and compound sub-patterns. For example, the duple pattern have simple duple and compound duple; the same goes for the rest. â€Å"In a simple meter, each beat is basically divided into halves. In compound meters, each beat is divided into thirds.†(Schmidt-Jones) This can be written as: Duple simple             1-and-2-and-1-and-2                                                2/4 Triple simple              1-and-2-and-3-and-1-and-2-and-3                           3/4 Quadruple simple      1-and-2-and-3-and-4-and-1-and-2-and-3-and-4      4/4 Duple compound      1-and-a-2-and-1-and-a-2                                          6/8  (pp. 3) Sometimes, a single piece can contain a number of time signatures. Sometimes, it can contain no definite pattern at all. A music piece that does not follow a specific time signature is called free meter. This is common in Gregorian chants or plainsong, and some cultural music that has distorted beats and pulses, which can be really frustrating for a listener as they can be hardly followed. There are also experimental musicians who does not stick to certain music patterns. Conclusion Music meter is one of the basic elements of music that is evidently easy to learn until we can come up with a professionally designed composition. Musicians and listeners to day has more advantage as music has progressed with a lot of new things to discover and experiment with. One only needs to look a few years back to know its historic details, which can be more interesting than today’s versions. Anyone can even educate themselves about it with the help of comprehensive and concise reading materials. References Dudley, L., Faricy, A., Rice, J. G. (1978) Elements of Music. The Humanities. (Sixth Edition, pp. 238-271). US: McGraw-Hill, Inc. Schmidt-Jones, C. (2007) Meter In Music. Connexions Module, Version 1.7, Retrieved February 15, 2007 from http://cnx.org/content/m12405/latest/
Sunday, January 5, 2020
Essay The Future Potential of DNA Fingerprinting - 1338 Words
The Tremendous Potential of DNA Fingerprinting Abstract; This paper explors the effects DNA fingerprinting has had on the trial courts and legal institutions. Judge Joseph Harris states that it is the single greatest advance in the search for truth since the advent of the cross examination (Gest, 1988). And I tend to agree with Judge Josephs assertion, but with the invention and implementation of DNA profiling and technology has come numerous problems. This paper will explore: how DNA evidence was introduced into the trial courts, the effects of DNA evidence on the jury system and the future of DNA evidence in the trial courts. Any new technology being introduced into the scientific community is ususally received†¦show more content†¦(Frye v. United States,293 F.2d at 1014.) The Frye standard has allowed the trial courts to answer the question of admissibility of DNA evidence. And although the trial courts allege to listen to the opinion of the scientific community, they reached their own consensus which allowed for the admissibility of DNA evidence in the trial courts. Although DNA evidence has been used in trial courts since 1986 it was not until April of 1992 that the Committee on DNA Technology in Forensic Science under the sponsorship of the National Academy of Science (NAS) gave its report that endorsed the forensic use of DNA. Although they endorsed DNA as a science they also qualified there endorsement by stating that it needed to have quality control, standardization, oversight and the collection of further data on which to base its statistical calculations of profile frequencies ( Billings 64). It would be remiss not mention the use of DNA fingerprinting in the OJ Simpson trial. The OJ Simpson trial will be remembered as one of the greatest murder trials to present DNA evidence. Many suggests that what we learn from this trial is that juries are not willing to convict based on DNA evidence alone. Although in many other cases a juror commented that you cant argue with science (Neufeld and Colman 1990). EitherShow MoreRelatedAnnotated Bibliography On Dna Fingerprinting1019 Words  | 5 PagesDNA fingerprinting is a scientific technology involving the extraction, replication and arrangement of strands of an organism’s DNA. This results in the formation of a genetically distinctive fingerprint that is unique to the organism which the DNA sample was originally extracted from. Because of the specificity of a DNA fingerprint, the application of this technology can have a substantial influence on many aspects of society. 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DNA analysisRead More DNA Testing and the Conviction of Criminals Essay1766 Words  | 8 PagesDNA Testing and the Conviction of Criminals There have been many incidents where cases have needed a solid prosecution in order to convict the defendant in a murder or rape case. This is where DNA Testing comes in to help. By taking a DNA test, a person can be found guilty or not guilty. If a person claims they have been raped there can be a sperm sample taken from the suspect in order to prove that he is guilty or not. In addition, in a murder case there can be blood taken from the suspectRead MoreThe Case Of Maryland V King1670 Words  | 7 Pagesexplicitly related to the legality of DNA collection of individuals early in the booking process for serious crimes. In a 5-4 decision, the Supreme Court ruled that pre-conviction DNA collection of those arrested for serious crimes is constitutional and does not violate the Fourth Amendment; a decision that will forever change the way DNA testing is used by the judicial system. This decision in favor of Maryland on the constitutionality of pre-conviction DNA testing was a result of the conclusionsRead More The Implications of DNA Profiling Essay3166 Words  | 13 PagesThe Implications of DNA Profiling Former attorney General Janet Reno described our system of justice as a search for the truth.(1) Increasingly, the forensic use of DNA technology is an important ally in that search. DNA fingerprinting, better known in the scientific realm as DNA profiling, has given police and the courts a means of identifying the perpetrators of rapes and murders with a very high degree of confidence. However, nine years after its introduction, forensic DNA typing is still used
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