Who told me ten scientific and technical information 20

I'll give you an example.

In 1876, a grand exposition was held in Philadelphia, USA, at which new inventions in the world were exhibited. One day, the King of Brazil came to visit. The king was looking at a small box and earpiece with great interest, and the young inventor Bell ran to the king and asked him to put the earpiece to his ear, and while he was speaking in the distance, the king heard Bell's voice, and was greatly shocked, and said in a loud voice:

My God, he spoke! "Bell told the king that it was telephone--**. Since then, ** and Bell's name have spread far and wide.

How did Bell invent it?

The idea of long-distance inter-distance calls has been around for a long time. By the 70s of the 19th century, the American inventor Gray first designed a set"Couple's telegraph device"。He uses two cans, each connected by a taut rope at the bottom.

When a person speaks to one end of the can, the vibrations are transmitted through the rope to the other end of the can. This experiment made Gray realize that the human voice is composed of tones of various frequencies, and if a suitable microphone can be designed, and then the tone can be turned into an electrical signal, and then transmitted and then turned into a voice at the other end, wouldn't this be a long-distance conversation?

Gray's vision was good, but it wasn't easy to achieve. This daunting task fell on the shoulders of another inventor, Bell.

Born in Scotland, England, Bell settled in the United States in 1869 as a Chinese teacher at Boston University. Inspired by the telegraph device, he was determined to turn Gray's vision into reality.

Bell and his assistant Washer designed a microphone with a magnetic reed in the center. This type of transmitter transmits sound of various frequencies, and the vibrating reed is converted into various electrical oscillations by electromagnetic induction. A device of the same structure is placed at the other end of a certain distance and is used as a receiver.

On February 14, 1876, the invention was granted a patent.

Soon, the Bell ** company was founded. At that time, the ** was surprisingly large, like a big box, and the speaker had to shout loudly, and could only talk within the confines of a small city.

The task of developing and perfecting the best technology fell on the great inventor Edison. He revolutionized Bell's ** structure, using carbon particle contact to control the current intensity. At the same time, Watson added magnetic electric bells and manufactured exchange station equipment.

At this time, ** gradually reached the point of perfection.

Since 1948, transistors have gradually replaced relays and other communication devices. In 1960, scientists invented the key dial, which uses transistors to emit audio. In recent years, the laser with laser as the carrier source and the record of the owner's reply have been developed, making it an indispensable tool for modern life.

Gray, Bell, Watson, Edison, etc. as the pioneer of the invention and cut into the history books, the name of the Bell company, is still famous all over the world.

The "Harmony" EMU was born.

Large speed increase is the abbreviation of large-area speed adjustment map, and it is the word with the highest "influence" of China's railways for more than ten years. The speed increase began on April 1, 1997, and the railway carried out three major speed increases on October 1, 1998, October 21, 2000 and October 21, 2001. The scope of the first four major speed-ups is mainly Beijing-Guangzhou, Beijing-Shanghai, Beijing-Harbin, Longhai, Lanxin, and Beijing.

Nine, Zhejiang, Jiangxi and other major trunk lines, after the speed, the train speed of more than 120 kilometers per hour of the line is 13,166 kilometers, the speed of more than 140 kilometers per hour of the line is 9,779 kilometers, the speed of more than 160 kilometers per hour of the line is 1,104 kilometers, Beijing from the fast, express train reached 98 pairs. On April 18, 2004, the fifth time was carried out, some lines of several major trunk lines reached a speed of 200 kilometers per hour, and the total mileage of the speed-up line reached more than 16,500 kilometers, of which the speed of 160 kilometers per hour and above was more than 7,700 kilometers, and 19 pairs of Z-shaped stations were newly opened to direct express trains, so that the fast and express trains reached 118 pairs, and further shortened the distance between large and medium-sized cities. On April 18, 2007, the sixth speed increase was the most eye-catching, after the speed, the speed of 200 kilometers per hour and above (the maximum speed of some sections of 250 kilometers per hour) reached 6003 kilometers, which is equivalent to the total mileage of the existing lines of Germany, France and other nine European countries with the same level of speed increase line; The "Harmony" domestic EMU, 5,500-ton heavy-duty freight train and double-decker container train running on major trunk lines such as Beijing-Shanghai, Shanghai-Kunming, and Jiaoji have become a unique landscape on the world's railway map.

The speed-up of China's railways is an important measure for China's railways to alleviate the constraints of transportation "bottlenecks" as soon as possible and adapt to the sustained, rapid and coordinated development of the national economy. In addition to the improvement of train running speed, the speed increase has also achieved major progress in many aspects of the railway: it has greatly increased the resources of the speed-up line, improved the quality of transportation services, transformed the production and operation mode of railway transportation, and improved the level of railway technology and equipment.

For more than ten years, the railway has not increased its price, which shows that the railway adheres to the concept of people-oriented. The speed increase has brought significant social benefits and good economic benefits, which is of great and far-reaching significance to accelerate the modernization of China's railways.

Chinese people travel faster.

On December 22, 2007, China's first localized 300 kilometers per hour "Harmony" EMU train was completed and rolled off the assembly line in CSR Sifang Locomotive and Rolling Stock Co., Ltd., thus China became the fourth country in the world to independently develop 300 kilometers per hour EMU after Japan, France and Germany. The "Harmony" EMU train will be officially put into operation on the Beijing-Tianjin Intercity Railway from August 1, 2008.

New technology has brought new life, and the successful development of EMUs has created a faster way for people to travel. With the operation of EMUs with a speed of 300 kilometers per hour, it will be more convenient for people to travel.

Now, technology is developed, and life is also convenient.

1. Well-developed communications.

In the past, you couldn't hit **, you could only pass on information through flying pigeons. It's slow, and I'm not sure it's correct!

But now, communication has developed, since there is a **, computer, press a few ** numbers or send a QQ, you can transmit information.

I miss grandma, press a few ** numbers, you can get through immediately, and you can hear her kind voice again; I didn't copy my homework, I sent a QQ, and my classmates could tell me my homework. It's convenient and correct!

Second, the transportation is developed.

Traffic in Wuhan is chaotic. But since the automatic red, yellow, green light and electronic eye, it is much better!

In the past, it was the traffic police who manipulated the red, yellow, and green lights. But when the time came, the yellow light should have been replaced by a green light, but it still hasn't been changed. In this way, the vehicle is clogged and the time is clogged.

Because of this, there are automatic red, yellow, and green lights, and the vehicles are not clogged, and the time efficiency is also improved!

With the popularization of electronic eyes, the number of illegal driving by drivers has been greatly reduced, traffic accidents have also been greatly reduced, and people's living environment has become more orderly.

In fact, with the development of science and technology, our earth's home can be so beautiful!

The myth of Chang'e running to the moon makes people think that the moon is very beautiful, but after the American Apollo landed on the moon, the moon turned out to be so ugly that it broke the beautiful imagination of mankind.

Ask directly:

Can anyone go to the primeval forest for 3 days without any technological tools?

1st place Leonardo da Vinci (Italy) Most famous invention: Calculator 2nd place: Nikola Tesla (USA) Most famous invention:

3rd place in radio: Alessandro Volt (Italy) Most famous invention: 4th place in batteries:

Alexander Bell (UK)'s most famous invention:**5th place: Isaac Newton's (UK)'s most famous invention:

6th place in calculus: Howard Hughes (USA) Most famous inventions: Improved aircraft design 7th place:

Benjamin Franklin (USA) Most Famous Inventions: Bifocal Glasses 8th Place: James Watt (United Kingdom) Most Famous Inventions:

Improved steam engine 9th place: Johannes Gutenberg (Germany) The most famous invention: modern printing 10th place:

Thomas Edison's (American) most famous invention: the light bulb.

1993 - American scientists propose a new theory of dinosaur extinction.

1952 – The United States conducts its first hydrogen bomb test.

1520 – A fleet of ships led by the Portuguese explorer Magellan arrives in the Strait of Magellan.

First-tier city: Shanghai.

Second-tier cities: Jinan, Qingdao, Nanjing, Suzhou, Wuxi, Hangzhou, Ningbo, Xiamen, Fuzhou, Yantai, Hefei, Nanchang, Quanzhou, Wenzhou.

Third-tier cities: Shaoxing, Taizhou, Weihai, Nantong, Tai'an, Dongying, Zhenjiang, Jining, Yangzhou, Xuzhou, Taizhou, Jiujiang, Ganzhou, Binzhou, Huzhou, Jiaxing, Linyi, Jinhua, Yichun, Xinyu, Jingdezhen, Yancheng, Pingxiang, Wuhu, Lianyungang, Liaocheng, Bengbu, Huainan, Ma'anshan, Lishui, Quzhou, Anqing, Ji'an, Yingtan, Zhangzhou, Huai'an, Dezhou, Heze.

Fourth-tier cities: Suqian, Zhoushan, Huaibei, Bozhou, Huaibei, Tongling, Huangshan, Fuyang, Suzhou, Chuzhou, Lu'an, Xuancheng, Chizhou, Putian, Longyan, Sanming, Nanping, Ningde, Fuzhou, Shangrao, Zibo, Zaozhuang, Weifang, Rizhao, Laiwu.

To use the mantra of the people of the world: "Believe and you can see!" Now that you've joined the company, you should be able to feel the difference. The company is in line with the mission of cultivating talents, developing talents, and creating entrepreneurs, so that more young people with ideals can find a new platform for entrepreneurship.

Only when the talent is strong, the company will be stronger! You tell me?