Zhong Xin Tech-Zhong Xin Tech

In 2013, people have mastered a lot of knowledge about electronic technology, and electronic technology is still developing. This knowledge is the result of long Labour. The phenomenon of electricity and magnetism has been discovered in China for a long time. In ancient books, there were records of "magnetic stone calls iron" and "amber picks up mustard". < a href = "" https://baike.so.com/doc/5305830.html" "> < / a > a magnet first applied in the direction and the correction time, the wang chong, everything is done and the eastern han dynasty, the two mentioned in the book" the theory of ＆#118alue "is refers to the" SiNa ". Later, due to the need of the development of navigation, our country invented the compass in the 11th century. By shen kua in song dynasty < a href = "https://baike.so.com/doc/5370527.html" "> MengXi stature for < / a >" in the "location to a magnet grinding needle from front, can guide, but Chang Wei by east, not all the south". This not only shows the compass, and have found < a href = "https://baike.so.com/doc/592298.html" > magnetic declination < / a >. It was not until the 12th century that the Compass was introduced to Europe by the Arabs. < p > at the end of the eighteenth century and the early nineteenth century of this period, due to the needs of the development of production, in the < a href = "https://baike.so.com/doc/1178222.html" "> < / a > electromagnetic phenomena research work development soon. Coulomb's first in 1785 from the laboratory to determine the interaction force between the charge, < a href = "https://baike.so.com/doc/5334480.html" "> < / a > concept began to charge with quantitative significance. In 1820, Auster's experimental discovery of the powerful effect of an electric current on a magnetic needle opened a new chapter in electrical theory. In the same year, Ampere determined that a coil with a current passing through it acted like a magnet, which pointed out the nature of the problem. The famous Ohm's law was formulated by Ohm through an experiment in 1826. Faraday made a special contribution to the study of electromagnetic phenomena, and his discovery of electromagnetic induction in 1831 was an important theoretical basis for later electronic technology. Lenz played a great role in the study of the theory and application of electromagnetic phenomena. In 1833, he established the rule to determine the direction of induced current (Lenz's Rule). < p > then he committed to motor theory research, and illuminates the motor reversible < a href = "https://baike.so.com/doc/5418626.html" "> < / a >. In 1844, Lenz and The British physicist Joule independently determined the current thermal effect law (Joule-Lenz law). Jacobi, who worked with Lenz on electromagnetic phenomena, demonstrated the possibility of practical use of electrical energy by building the world's first electric motor in 1834. The great leap forward in electrical engineering was due to the work of Dorivo-Dobrowalski. The brilliant Russian engineer was the founder of the three-phase system, inventing and manufacturing the three-phase induction motor and the three-phase transformer, and first using the three-phase transmission line. Building on Faraday's work, Maxwell developed the theory of electromagnetic waves in 1864-73. He theorized the existence of electromagnetic waves, which laid the theoretical foundation for the development of radio technology. In 1888, Hertz confirmed Maxwell's theory by experimenting with electromagnetic waves. But the actual use of the < a href = "https://baike.so.com/doc/36921.html" "> < / a > electromagnetic waves for human services should also be attributed to Marconi and popov. About seven years after the Hertz experiment, they conducted separate communications experiments in Italy and Russia, opening the way for the development of radio technology. In the course of the struggle in nature, man is constantly summing up and enriching his knowledge. Electronic science and technology is developed in the struggle of production and scientific experiments. In 1883, The American inventor Thomas Edison discovered the thermal electron effect, and in 1904, Fleming used this effect to make the electronic diode, and proved that the electron tube has the "valve" function, he was first used in radio detection. In 1906, The most important milestone in early electronic technology was achieved by The invention of the electronic triode by placing a third electrode -- a grid -- in Fleming's diode. For more than half a century, the electron tube has made a great contribution in the electronic technology; But tubes are expensive, complicated, bulky, and consume a lot of electricity. Since the invention of the transistor by a few researchers at Bell Laboratories in 1948, In most areas have gradually < a href = "https://baike.so.com/doc/3069134.html" "> < / a > to replace the transistor < a Href = "" https://baike.so.com/doc/19050.html" "> tube < / a >. However, we cannot deny the unique advantages of the electron tube. In some devices, whether for stability, economy or power, the electron tube is needed. < p > < a href = "https://baike.so.com/doc/647555.html" "> < / a > of integrated circuits, the first sample is appeared in 1958 in the world. < a href = "https://baike.so.com/doc/647555.html" ">" appearance and application of the integrated circuit < / a >, Mark the < a href = "https://baike.so.com/doc/4504789.html" "> < / a > electronic technology to a new stage. It realizes the unity of material, component and circuit. With the traditional electronic components design and production mode, the structure of the circuit is fundamentally different. With the development of integrated circuit manufacturing process, the degree of integration becomes more and more high, the emergence of large scale and very large scale integrated circuits (for example, a complete computer can be made on a 6mm square silicon chip), Further shows that integrated circuit of < a href = "https://baike.so.com/doc/6963996.html" "> superiority < / a >. With the development of semiconductor technology and the needs of scientific research, production and management, electronic computers should rise and become more and more perfect. Since the birth of the first electronic computer in 1946, it has experienced four generations of electron tubes, transistors, integrated circuits and vlSI, with a speed of 1 billion operations per second. Research is under way to develop a fifth generation of computers (artificial intelligence computers) and a sixth generation of computers (biological computers), which do not rely on programs to work, but rely on artificial intelligence. Especially since the advent of satellite computer in the 1970s, the popularity of electronic computers has been greatly accelerated because of its low price, convenience, reliability and small size. Digital control and digital measurement are also increasingly widely used. Numerically controlled and "adaptive" numerically controlled machine tools followed. The use of electronic computers to dozens or even hundreds of digital control machine tools for centralized control (the so-called "group control") has also been realized. < p > in industry crystal thyratron (i.e., < a href = "https://baike.so.com/doc/5401747.html" "> < / a > silicon controlled rectifier), is being widely applied in semiconductor technology into the field of high voltage. With the development of production and science and technology, Electronic technology is highly developed and widely used electronic technology, biomedical electronics technology (such as space, information processing, and < a href = "https://baike.so.com/doc/4930748.html" "> remote sensing technology < / a >, < a Href = "" https://baike.so.com/doc/5398619.html" "> < / a > microwave application, etc.), it is the development of social productivity, can play the transformative role. Electronic level is an important symbol of modernization, and electronic industry is an important material and technical basis for modernization. Speed and skill levels for the development of the electronic industry, especially the height of the development of computer and its wide application in the field of production, directly affect the industry, agriculture, science and technology and the < a href = "https://baike.so.com/doc/5405705.html" "> defense construction of < / a >, Related to the speed of development of socialist construction and national security; Also directly affect the millions of people's material and cultural life, relation with broad masses' vital < a href = "https://baike.so.com/doc/6413454.html" "> < / a >.