科技小报(英文)
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Generally, high-tech is a personnel-intensive, knowledge-intensive, technology-intensive, capital-intensive, risk, information intensive, intensive intensive industries, competitive and strong permeability, the development and progress of human society has a significant impact on the forefront of science and technology. This will be one of the key factors to promote the development of all trades and professions." Science and technology" in the academic literature interpretationBut ccording to the introduction, so far, has no one to science technology under defined as recognized by the people of the world, science and technology and strength, progress and contribution together problems are more complicated. In early 1804, a man named Delhi Weiss British mining engineer, first use of Watt's steam engine built the world's first steam locomotive. This is a single cylinder steam engine, can drive 5 carriages, its speed is 5 to 6 km. This locomotive was not designed cab, when a locomotive runs, the driver in the car while driving with. When using coal or firewood as fuel, so they called it the" train", and has been in use ever since. The history of mankind the most important mechanical vehicles, known as early steam locomotives, also called train. Independent rail running. Railway train loading material, can be divided into the truck and passenger car; also has both the passenger and freight car.In 1781, train pioneer George. Stephenson was born in a family of British miners. Until the age of 18, he is still a not know a single word of illiteracy. Despite the ridicule of others, and seven or eight year old children sat in the classroom learning. Science and technology is the first productivity. Looking at all times and in all countries, the human society every advance, are accompanied by the progress of science and technology. Especially modern technology make a spurt of progress, social productivity development and human civilization opened up a broader space, a strong impetus to the development of economy and society. Our computer, communications, biomedicine, new materials and other high-tech enterprise growing rapidly, greatly improved China's industrial technology level, promoting the industrial, agricultural labor productivity rises substantially, a strong impetus to the development of the whole national economy. Practice has proved, new and high technology and its industry has become the economic development of the leading industry. The rocket is currently the only allows objects to reach escape velocity, overcome or get rid of the gravity of the earth, in space vehicles. The speed of the rocket is a rocket engine to obtain. As early as 1903 Qi orcoWildavsky was deduced from a single rocket ideal velocity equation: V = Omega LnMo / Mk, called tsiolkovski formula. Omega as the engine of the jet velocity, Mo and Mk, respectively is the rocket 's initial quality and the flameout of the engine ( used when the quality of the propellant ). Mo / Mk is called the rocket mass ratio.By this formula, the speed of the rocket engine jet speed proportional to, at the same time as the rocket mass ratio increases. Even with the best performance LOX propellant, engine jet speed can reach 4.3 ~ 4.4 km / s. Therefore, a single rocket could not put objects into rbit, must adopt multistage rocket, by way of relay the spacecraft into orbit. 本文来源：https://www.wddqw.com/doc/2d27f7c1590216fc700abb68a98271fe900eaff3.html