1. The scientific name of computer is electronic computer, which developed from the early electronic calculator. From 65438 to 0946, the first electronic digital computer "ENIAC" appeared in the world, which was used to calculate the trajectory. It is manufactured by Moore Institute of Electrical Engineering, University of Pennsylvania, USA, but it is huge, covering an area of 170 square meters, weighing about 30 tons, and consumes nearly 100 kilowatts of electricity. Obviously, such computers are expensive and inconvenient to use. 1956, the transistor electronic computer was born, which is the second generation electronic computer. Only a few larger cabinets can be installed, and the operation speed is greatly improved. The third generation of integrated circuit computers appeared in 1959.
The original computer was invented by john von neumann (at that time, the computing power of the computer was equivalent to the current calculator), which was as big as three warehouses, and then gradually developed.
This is the latest stage of computer development since 1970s. By 1976, "Cray" made of LSI and VLSI made the computer enter the fourth generation. With the invention of VLSI, electronic computers are constantly upgrading to miniaturization, miniaturization, low power consumption, intelligence and systematization.
In the 1990s, computers developed in the direction of "intelligence", creating computers similar to human brains, which can do thinking, learning, memory and network communication.
In the 265,438+0th century, computers have become more notebook-oriented, miniaturized and specialized, with an operation speed of over 65,438,000 billion times per second. It is not only easy to operate and cheap, but also can replace part of people's mental work and even expand people's intelligence in some aspects. Therefore, today's microcomputers are vividly called computers.
The first personal computer in the world was launched by IBM in 198 1 year.
2. The appearance of nanotechnology has expanded a broad space for energy conservation, environmental protection and other fields, which is undoubtedly a new technological revolution. Nanotechnology is applied in the field of materials, which has the characteristics of not contacting with water and oil. Anti-fog windshield and self-cleaning nano-cloth have been put into use one after another. The test of the test center shows that the product changes the critical friction from sliding to rolling, which makes the product have magical effect. Nano-fuel additive developed by Professor Li, a doctor studying in Peking University, was industrialized three years ago. The product is characterized by adding nano-water particles treated by liquid-phase nano-assembly technology, which changes the combustion process of fuel with brand-new physical effects. After the large-scale use of one million tons of fuel oil, the fuel saving rate reaches 10-20%. Beijing Bonnasse Technology Co., Ltd. has launched the second generation product-Bonus nano fuel additive. The products have been tested by the Energy Utilization Testing Center of the automobile transportation industry of the Ministry of Communications, the Oil Field Energy Conservation Monitoring Center of China Petroleum and Natural Gas Group, the Environmental Science Research Institute of the State Environmental Protection Administration and the Environmental Protection Monitoring Center of Beijing Environmental Protection Bureau. This product can greatly save energy and reduce the emission of harmful substances in tail gas, especially the emission of nitrogen oxides, which has become the focus of environmental protection. In addition, the company has recently introduced nano lubricating oil additives, which have passed the bench test of China People's Liberation Army Military Transportation College and the oil equipment test of China People's Liberation Army. The results show that the cylinder pressure increases, the power increases, and it is energy-saving and environment-friendly. The adoption rate of "Never Forget the Crescent Moon" Answer:15.7% 2009-12-1512: 04 Report the selection results of the second 2008 10 great inventions of American Popular Science magazine. From the mine positioning life-saving system to the durable bridge design, all the original ideas selected this year revolve around the same theme, that is, energy shortage, frequent disasters, diseases and illnesses plague human beings and the world needs help. Popular Science magazine in the United States selected the top ten inventions in 2009, including the bait that will not pollute the water quality through plastic surgery, the mushroom wallboard with heat insulation and fire prevention function, the fastest tank in the world, the shock absorber that generates electricity by bumping cars, the "robot leg" that helps paraplegics walk again, and the new urinary catheter that makes nurses no longer worry about finding veins. ...
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