The Nervous System :: Biology, Neurons, Axon

The peripheral nervous system consists of two separately functioning components: the sensory division and the motor division. The sensory division provides appropriate responses from sensory receptors to the central nervous system. Sensory neurons transmit reactive responses from the periphery to the central nervous system while the motor division conducts action potentials from effector organs such as muscles and glands. In contrast, motor neurons transmit action potentials from the central nervous system toward the periphery (Seeley et al., 2005). Neurons and their Electrical Activity The nervous system is composed of millions of nerve cells called neurons. Neurons are the parenchyma of the nervous system which performs every function of the nervous system from simple sensory functions to complex thinking and analysis. Neurons, upon receipt of stimuli, transmit responsive signals to other neurons or to effector organs. Clark (2005) observes that the anatomy of a neuron is composed of four main parts; the cell body, the dendrites, the axon, and the nerve fibers. Given the importance of each of the neuron components, it is important to discuss how each work separately and in tandem to achieve efficient and appropriate responses in the human body. Varying in diameter and containing a single nucleus, the cell body is the primary component of the neuron. The nucleus of the neuron provides information for protein synthesis and contains most of the organelles of the neuron. Seeley et al., (2005) write that the cell body contains large numbers of mitochondria because of its high metabolic function and also abundant rough endoplasmic reticulum’s which referred to as Nissl bodies. The dendrites of a neuron are cytoplasmic extensions that reach out from the cell body like arms and contain a full array of cellular organelles, such as mitochondria, chromatophilic substance, and ribosomes. The most important feature of a dendrite is its electrical activity. Dendrites receive information from other neurons and transmit them toward the cell body, then produce electrical impulses referred to as graded potentials. Graded potentials can have varying degrees of depolarization or hyperpolarization. These graded potentials arise in the dendrites or in the cell body as a result of various stimuli and are important in initiating action potentials in neurons. As the graded potential passes through a cell body, it may initiate an action potential at the base of another cytoplasmic projection which is the axon (Clark, 2005). An axon is a long cell process extending from the neuron cell body.

Physics in Video Games :: physics video game computer

There are a few different physics engines that programmers use now for their games. There are 2 main physics engines that programmers use: Havok, and Math Engine. A Physics Engine is the code that game companies buy or Build to put in their code. The code is already written and they just have to implement the code in their program. The thing about Physics in video games is that none of it has to be realistic. Most of the physics in older games aren't close to being realistic for there were way too many equations the program would have to solve and it would slow it down. There are arguments that go on that unrealistic games are more fun, or realistic games are more fun. Video Games have been around for over thirty years now. A lot have changed in the way programs work. When they first came out Video Games weren't that powerful because the hardware couldn't support it. Now the possibilities are almost endless. Games have changed so much. From Games like Asteroids that was made in 1979. With Asteroids being only a small program with some computations going on. To current games like Half-life 2. With so many physics computations going on. They try to make this game the most realistic game. Out there. The current trend in video games is to make them more and more realistic. The more realistic they make the game. The more equations the program has to do, so the program is a lot bigger and needs a lot more power to do everything the game wants. There is a lot of lines of code in video games. There are teams of people who work on games now. Here is some example of how code is implemented into programs to make it look like you are jumping. I got this example from the web site http://www.gamedev.net/reference/articles/article694.asp this is pseudo-code that can be used for if you were having the character in the game jump straight up. Joe.postion.y = 0; (Or wherever floor is) Joe.velocity.y = 0; Joe.acceleration = 10; Joe.jumping = NO; Loop If (jump key is pressed) { Joe.velocity.y = 100; Joe.jumping = YES; } if (Joe.jumping == YES) /* Move Joe if we are jumping */ { Joe.velocity.y = Joe.velocity.y - Joe.acceleration Joe.

The Great Digital Divide Essay -- Exploratory Essays Research Papers

The Great Digital Divide The digital divide is defined as the gap between the information ‘haves’, the information ‘have-lates’, and the information ‘have-nots’. This disparity has arguably persevered from as early as the advent of the Gutenberg printing press, and continues to be pervasive and to flourish in the present day. There are many individuals who commonly perceive the digital divide to be solely comprised of the disparity of access to computers and the Internet, but this is not the sole case. It is vitally important to recognize that the digital divide is not only comprised of an access inequality to computers and the Internet, but additionally encompasses the right of use to other telecommunications or technological devices; for instance, cellular telephones, satellites, and even spanning into basic cable services for the rather universal activity of television watching. In chronological order, the following expose will present a comprehensive considerati on of the premises of the digital divide, the cohorts affected and stratified by the digital divide, and finally the notions or initiatives that have been taken in an effort to halt this ever-widening gap. As aforementioned, in general, the digital divide consists of a disparity in access to technology. In more complex terminology, it is the abyss in access to technology tools and related learning opportunities, most commonly imposed by socioeconomic status, race, gender, and so forth (Digital Divide Network, 2002). Knowledgeable critics have typically sub-divided those affected by the digital divide into a triad of distinct assemblies; the ‘haves’, ‘have-lates’, and ‘have-nots’ (Globalization: The Reader, p. 81). ‘Haves’ include individuals w... ...obalization: The Reader. Routledge Publishing: New York, 2000. â€Å"Digital Divide.† PBS. (2002). Available Online: http://www.pbs.org/digitaldivide/. â€Å"Falling Through the Net: Defining the Digital Divide.† National Telecommunications & Information Administration. (1999). Available Online: http://www.ntia.doc.gov/ntiahome/fttn99/contents.html. Gauntlett, David. Web Studies. Arnold Publishing: New York, 2000. Sargent, Mark. â€Å"Community Technology Centers: A National Movement to Close the Digital Divide.† Digital Divide Network. (2002). Available Online: http://www.digitaldividenetwork.org/content/stories/index.cfmkey=245. â€Å"Kofi Annan: IT Industry Must Help Bridge Global Digital Divide.† Digital Divide Network. (2003). Available Online: http://www.digitaldividenetwork.org/content/stories/index.cfm?key=272.

My First Day Essay Essay

My First Day†¦ As of today, August 30th, I, Blah blah blah, took the initiative to explore the entire campus. Today, the temperature could have possibly been right at about 93 degrees, and I decided to walk around this gigantic campus to waste time before my next class. During orientation week, I missed the campus tours because I was too busy sleeping my day away. So, what other way to compensate for lost time than to take my very own campus tour? Initially, I intended to look for the art buildings, but the best thing I discovered after my journey today happened to be the fact that the art buildings were being reconstructed. Just my luck. However, I did find the Knight Physics building which happens to be absolutely gorgeous. I also happened to stumble across the school’s arbortorium. I felt like I was walking through a jungle with my combat boots on and the leaves hovering above my head. I walked around in a circle and found my way to the school of law. The school of law is literally like its own kingdom within the campus. The students had their own law shirts, and the windows of the classroom even had curtains to block the sun out. I know curtains are a pretty simplistic observation, but I could not help but to find that fascinating! I have failed to sit in any classroom that had panels to block the sun. Only in the law school at the University of †¦. As I walked away from the law school, I made my way towards the UC area and back around towards the Rat. Passing the vivacious students lounging with their friends, I hiked around the lake under the scorching sun wishing that I had a bottle of water, a hat, and maybe even some sun glasses. The heat was pretty unbearable. Passing between the Hecht and Stanford towers, I ventured towards the school of architecture. That is one white building. I expected it to be more lavish in its exterior design seeing that it is the school of architecture. I walked past the school of architecture and head back towards Mahoney-Pearson. I know that area pretty well. †¦ is my new home for now. As I left the Mahoney-Pearson area, I circled around towards the UC area again and crossed the winding paths towards the Whitten Learning Center. There was approximately 10 minutes left to spare before class started, and the brightest idea that I came up with all day was†¦ to finally sit down!

International tourism Essay

Every year, hundreds of millions of people move around to see a different part of the world. It is natural to assume that tourists who have seen other countries have a better knowledge of the people. That assumption also leads to the conclusion that international tourism promotes understanding between nations. How true is this? Let us examine what tourists do in a different country. First, before going abroad, tourists are often told by their travel agents of the possible hazards which sometimes include local people. They are given example of extreme cases where victims are always the travelers. Then, when they arrive, they are immediately taken to their hotels in big coaches. They flood places where local people don’t go. Their shopping, meals, entertainment all take place in secluded areas. They wear a bubble all the way. Apart from speaking to the guide and a few shop assistants, tourists rarely talk to the local people. To make it even worse, they meet pickpockets, they are ripped off by dishonest traders. Furthermore, very few local people bother to talk to them out of a genuine interest in the guests’ country, people and culture. Therefore, when asked how much they know about the local people, their answer is â€Å"very little†. If someone really wants to understand a different culture, he has to learn its language, stay there for at least a few month without wearing a bubble, learn how to curse and swear, bargain with a vegetable vendor and then he can say that he understands the people.

Memory

Three participants ages 19, 19, and 20 were asked to listen to three lists of words whose contents ranged from low to high association. The low-association list was defined by words that had no particular relation to each other. Conversely, the high-association list was characterized by words that had very close relationships with each other, whereas the in-between list of medium association contained words among which loose relationships existed. Each list contained ten words. The three lists were read to each participant in a slow and systematic way, leaving an interval of approximately one second between the calling of each word. Each participant was then given a minute to write down as many words as they could recall. The average number of words remembered from the low-association list was three (3), which represents a low level of recall for short term memory. This is consistent with the idea that the brain employs a short-term memory system that is able to hold limited information, and this can be done for only a short time without the aid of semantic prompters (Brown et al., 1985). The group of words on the low-association list contained almost no semantic prompters, as these words belonged to no specific category that could have been called up in the schema of the persons involved in the experiment.    As a result, the first few words called in each list allowed the participants no leeway to use schema as a mnemonic device for recalling them. Relying therefore only on short-term memory, the participants were able only to remember a small portion of the words. It is also important to note that those which were remembered were the ones located near the end of the list. This indicates that the effort to remember those later words nullified any earlier efforts made at memorization, and consequently removed the earlier words from the participants’ short-term memory. The second list of words containing a limited number of related words (medium association) showed a recall level for the participants of approximately six (6) words. The final two words on the list were recalled by two of the participants, and the other recalled the last word. However, the few words on the list that were related were universally recalled by the participants. The experiment apparently enabled them to make connections among the related words and to further connect them to a category in their schemata. This occurrence points to the tendency of the mind to categorize the information it receives, and the long-term memory of these participants appears to have been activated by associating the related words to their appropriate category. This categorization is most likely the factor that aided the short term memory of the participants, allowing them to recall a greater percentage of the words (almost twice as many) than they were able to recall from the first list. The third list contained words that were all highly related to each other. The experiment demonstrated even more the extent to which semantic categorization has the ability to aid short-term memory. The participants remembered an average of approximately nine (9) words on the list. This represents a vast increase over the previous two tries. This part of the experiment indicates the participants appeal to their long term memory as an aid in memorizing the contents of this list. For instance, despite the fact that the words on the low-association list were familiar words, their ability to remember them was compromised by the fact that they had no method of selecting them from all the other things that reside in their memories. Conversely, the fact that the words from the third experiment were all members of a particular category allowed these participants to use the taxonomic feature of long-term memory to aid recall in this memory experiment (Brown et al., 1985). The parallel trend of increased remembrance alongside increased association therefore underlines the importance of schema in the enhancement of memory. Reference Brown, A. S., S. L. Whiteman, R. J. Cattoi & C. K. Bradley. (1985). â€Å"Associative strength level   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   and retrieval inhibition in semantic memory.† The American Journal of Psychology.    98(3):   421-432.   

Contract of Documents between Macbeth and Noddy Bank

The contract for sale which Macbeth had entered with Weetocrunch Ltd is a separate contract with that of the contract entered with the banks with regards to the documentary credits. For the purposes of this question, we are only dealing with the contract of the documents between Macbeth and the confirming bank, Noddy Bank. Noddy bank had been authorized in this case by the issuing bank, Toytown Bank to pay the beneficiary, also known as the seller, Macbeth for the goods he had shipped to Weetocrunch.It is only upon presentation by Macbeth of valid documents that complies with the terms and requirements stated in the Letter of credit that had been opened by Toytown Bank on behalf of Weetocrunch, that he can receive his payment. As it is the letter of credit acts as some form of safeguard for seller that he will receive his payment as once the bank opens the letter of credit, they are under a contractual obligation to pay the seller upon presentation of complying documents.In this case , it can be seen that the documents presented by Macbeth had been ejected twice by the bank, first on the grounds that the documents are not original and secondly where the description of the goods in the bill of lading differs. For that we refer to the body known as Uniform Customs and Practice for Documentary Credits (UCP) which governs the practice of documentary credit. It should be noted that the law construed by UCP must be incorporated into the contract by the parties for it to have legal effect.However, even if it is not incorporated, the courts are likely to view it as impliedly incorporated as it has gained igh level of acceptance among international bankers. Therefore, assuming that IJCP applies in this case, the documents involved are bound by the UCP articles. Under UCP 600, article 15, the bank that is presented with documents have to ensure that they comply with the terms of the credit and if the document complies, they have to pay and under IJCP 500 article 13(a), th e bank is to examine the documents with reasonable care to ascertain whether they appear on the face to be in compliance with the requirement of the credit.If the documents are however not in ompliance, the bank under UCP 600 article 14(b) reserves the right to reject them. It is therefore establish here that the bank do have a right to reject documents. In this case then, the two issues to be dealt with are (1) whether the bank had the right to reject the photocopied custom certificate and (2)whether the bank had the right to reject the bill of lading because of the description error.Issue 1: UCP 600, Article 17(b) states that there should at least be one original of each stipulated document be tendered to the bank and it shall be treated as original it it ore an original signature, mark, stamp or label of the issuer of the document unless the document indicates it is not original and under 17(c), a bank shall also accept a document as original if it appears so be written, typed or stamped by the document issuer's hand, or by the document issuer's original stationary or states that it is original.In this case, it is not stated whether the document had any kind of markings of whether it was indicated as original on it, it was merely stated that it was a photocopied version that was rejected. Assuming that there were no markings as uch, then It could be inferred that the rejection was Justified following the case of Glencore International AG v Bank of China where the documents were rejected because the photocopies were not marked as original.In that case, it was also stated that a signature on photocopied piece does not make it an original but merely an authenticated copy. However, following the case of Credit Industriel et Commercial v China Merchants Bank, it was held that for obvious original documents, they need not be marked and for photocopied documents where there is a stamp of the upplier's name, address and telephone no. with an ink signature, the cour t accepted it as original even though it was not stamped ‘original'.Therefore if there were such markings found on the photocopied custom certificate and the bank had rejected it, the bank may be liable for wrongly rejecting the documents. Issue 2: As mentioned earlier, the bank have to put up with strict compliance when handling documents presented by the beneficiaries. They have to ensure that the documents meets the necessary terms and conditions stated in the letter of credit and as once emarked by Viscount Sumner in Equitable Trust Co of New York v Dawson Partners Ltd, there is no room for documents which are almost the same, or which will do Just as well. In Seaconsar Far East Ltd v Bank Markazi Jomhouri Islami Iran, the letter of credit stipulated that all the documents presented must bear LC number and the buyer's name. When one of the document failed to have the LC no. on it, the bank rejected it and the court found that its action was Justified. Similarly, in JH Rayn er & Co Ltd, Hambro's Bank Ltd, the credit stipulated â€Å"Coromandel Groundnuts† but the eller presented a bill of lading that states â€Å"Machine-shelled groundnuts. Though it had been known for these terms to be used interchangeable, the court found that the bank had the right to reject the documents. By following this case itself, we might be able to infer that the bank was right in rejecting the documents when the bill of lading states ‘Eastern Wheat' instead of ‘Ruritanian wheat'and that fact that it is well known in the wheat trade that the wheat are identical will not matter.However, Macbeth may still have a chance if they are able to prove that the error was ne of trivial discrepancy. As stated under IJCP 600 article 30(b), the IJCP do allow certain discrepancies. However, what is meant by trivial is unclear. In Glencore International AG v Bank of China, the word branch which was used instead of brand was tound to be merely an error whereas the court w as not as generous in Beyene v Irving Trust Co. , where the bill of lading which had misspelled Mohammed Soran instead of Mohammed Sofan was rejected.It is therefore not certain whether Macbeth will be able to reply on this but chances are it appears to be very slim. b) As explained in question (a), the bank will have to put up with strict compliance when handling with the documents presented by the beneficiaries and they reserve the right to reject the documents when following their own Judgment and feels that it does not comply with the terms and conditions of the letter of credit.In this second situation, it not much about an accepting or rejecting documents matter but one which involves fraud. An amendment has been made to the bill of lading by someone to change the date of shipment from 2 February to 31 January and although it has een clearly stated that Macbeth was not responsible for this amendment, he may still be liable for fraud under misrepresentation if he carries on to seek for payment as he was aware of the alteration.In the case Standard Chartered Bank v Pakistan National Shipping Corpn, it was held that there will be fraud if the beneficiary or their agent presents documents knowing they contain untrue statements and intending they should be acted on by the person receiving the documents and it will not matter whatever their motive was. It will be a totally different issue however here the beneficiary or the agent was not aware of the untruth and had acted in good faith.In this case however it appears unlikely to be so as Macbeth had made a discovery. Therefore, if Macbeth continues to tender the shipping documents to the Noddy bank, Noddy bank will reserve the right to refuse payment if the bank is able to rely on the alteration of the dates on the bill of lading as compelling evidence of fraudulent presentation by Macbeth. What Macbeth will have to do now after rejection is to after the original company where he had bought the wheat from.