1, 180 1, the British chemist humphry davy electrified the platinum wire to glow, and the whole world has been expecting the early arrival of the electric light ever since. However, this expectation is 78 years, 1874, and two electrical technicians in Canada applied for a patent for electric light. They filled the glass bulbs with helium and lit them with charged carbon rods. But they have no money to develop this invention.
2. 1875, Edison tried to improve the filament with various materials to prolong the service life of the bulb. 1879, he replaced the carbon rod with carbon wire, and the service life of the light bulb reached 13 hours. This made electric light popular.
Qian Xuesen loved the motherland and science since he was a teenager. Later, he went to the United States to study aerodynamics, put forward "Carmen-Qian formula" with his teacher, and founded engineering cybernetics. After the founding of New China, he actively requested to return to China to participate in the construction. After five years of obstruction and persecution, he finally returned to the motherland, and he was praised as a people's scientist.
4. Deng Jiaxian is one of the founders of China's theoretical research on nuclear weapons. As early as his youth, he set up the ideal of becoming a powerful country through science and technology. From 65438 to 0948, he went to Purdue University in the United States to study abroad and obtained a doctorate in physics.
1950 give up the excellent working and living conditions abroad and return to the motherland. Struggled in obscurity for decades. He organized and led the research on basic theories such as detonation physics and fluid mechanics, and made a lot of simulation calculation and analysis on the physical process of the atomic bomb, thus taking the first step of China's independent research and design of nuclear weapons.