... A cell phone can communicate on 1,664 channels. Cell phones also operate within cells and they can switch cells as they move around. Cells give cell phones incredible range. A walkie-talkie can transmit perhaps a mile. A CB radio, because it has much higher power, can transmit perhaps 5 miles. Someone using a cell phone, on the other hand, can drive clear across a city and maintain a conversation the entire time. Cells are what give a cell phone its incredible range (Anonymous #2). The genius of the cellular system is the realization that a city can be chopped up into small cells, and that the cells allow extensive frequency reuse across a city. Frequency reu ...
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... numbers as identification numbers Credit card numbers are printed on every receipt. And our liscense number is used on a daily basis. Despite this there are ways to prevent yourself from falling victem to identity theft. you see a criminal likes easy prey. They don't want to have to work for it. It's like locking your car at the mall, sure someone might break in anyway, but chance are if your doors are lock the will probably move on to another car. First off... Never give your credit card number online out unless you are positive that the company you are dealing with is legitimate and reputable. If you aren't sure call the better burough of business. ...
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... reached superconductivity at around 35 degrees Kelvin or –238 degrees Celsius. In the next year, a team of Chinese-American physicists declared that they had found a material that reached superconductivity at 92 degrees Kelvin. This was a big improvement. 92 degrees Kelvin is not a very high temperature, in fact, it is the equivalent of –181 degrees Celsius. Locating superconducting material above 77 degree Kelvin is a good thing because it means that the material will be easily produced and used. A theoretical understanding of superconductivity was advanced in 1957 by American physicists John Bardeen, Leon Cooper, and John Schrieffer. Their Theories of Supercond ...
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... was first outlined in 1833 by the British mathematician Charles Babbage. His design of an analytical engine contained all of the necessary components of a modern computer: input devices, a memory, a control unit, and output devices. Most of the actions of the analytical engine were to be done through the use of punched cards. Even though Babbage worked on the analytical engine for nearly 40 years, he never actually made a working machine. In 1889 Herman Hollerith, an American inventor, patented a calculating machine that counted, collated, and sorted information stored on punched cards. His machine was first used to help sort statistical information for t ...
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... technology and data retrieval systems and transactions, information has been given commercial value, especially with regards to the issue of who owns and controls this information. The information age has been a period that has allowed rights to privacy to beocme seriously jeopardized by new information technologies. Richard A. Spinello, has defined two distinct phases to the systematic erosion of information privacy. The first he calls the 'data base phase'. The emergence of sophisticatd data base technology in the early eighties made it possible to store and retrieve large amounts of information efficiently and economically. During ...
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... track of its accounts. Then they must choose the correct hardware and software that's best for their needs, while at the same time making themselves familiar with the new enhancements that increase productivity. Finally, the company must allow time for installation and training. When looking at the need to change from a manual accounting system to a computerized accounting system you also need to look at the future demands of your company. How do you know when it is time to make the change? When your company has grown so large that it no longer has access to the data used to make decisions, then it is probably time to switch to a computerized data mana ...
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... decision handed down on June 26, 1997, the Court upheld the lower court's ruling and struck down the decency act. The Supreme Court stated that the act was not only vague but that it unconstitutionally restricted the free speech rights of adults. An estimated of 40% of Internet material originates from foreign countries, where the US's Decency Act would not apply. Governments should not have the power to determine what sort of material is fit or unfit for individuals and their children to access on the Internet. Such power could become an oppressive form of censorship and could be used in an arbitrary manner by local judges and prosecutors to target minority vi ...
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... been heard of before has been spotted. As John Welch, the assistant secretary of Air Force said, "Stealth gives us back that fundamental element of war called surprise" (Goodall 9). After it was found that aircraft could be very useful in war, it was used for large scale reconnaissance. Then people started to add bombs to aircraft and then airplanes started to become an essence of war. After World War 2, new bombers were developed with fast speed, and could travel far distances. They could also carry nuclear bombs and missiles. The use of the bomber aircraft then led to the fighter, which was equipped with guns and missiles. Helicopters were also found to be ...
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... had been shown through its usefulness in payroll applications that computing had the potential of larger cost savings in both those employed and what they did with their time. Menial, repetitive tasks could easily be carried out by computers with no loss of efficiency of effectiveness however long the tasks took. The only problem was the expense of the machines. This was solved by the introduction of large Scale Integration (LSI), newly invented components and improving manufacturing techniques, which made the devices in these machines cheaper to build. Due to these advances IBM unveiled the first online transaction processing system in 1964. It was designed ...
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... in The First World War. These engines are placed in a radial pattern around the crankshaft. These produced respectable horsepower numbers in the category of up to 185+. They were used in such famous aircraft as the Sopwith Camel and Moth. A variation of the rotary engine was used in the most famous aircraft of the war: The Fokker Dr.1 Triplane flown by Baron Von Richtofen. A unique feature of these engines is that they had no throttle, but ran at a constant speed. Also the cylinders were not fixed in place as one might expect. They instead rotated around a fixed crankshaft. The propeller was attached to the cylinders. The advantage of this configuration was lower ...
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