thermionic emission

简明释义

热离子发射

英英释义

例句

1.Devices utilizing thermionic emission can achieve high performance in various applications.

利用热电子发射的设备在各种应用中可以实现高性能。

2.In many electronic devices, thermionic emission is crucial for the functioning of diodes and transistors.

在许多电子设备中，热电子发射对二极管和晶体管的功能至关重要。

3.The phenomenon of thermionic emission occurs when a metal is heated to a high temperature.

当金属被加热到高温时，热电子发射现象就会发生。

4.Researchers are exploring materials that enhance thermionic emission to improve energy conversion efficiency.

研究人员正在探索增强热电子发射的材料，以提高能量转换效率。

5.The vacuum tube operates based on the principle of thermionic emission, which allows electrons to be released from a heated cathode.

真空管的工作原理基于热电子发射，这使得电子可以从加热的阴极释放。

作文

Thermionic emission is a phenomenon that plays a crucial role in various fields of science and technology, particularly in the functioning of vacuum tubes and cathode ray tubes. It refers to the process where electrons are emitted from a heated material, typically a metal, into a vacuum or low-pressure environment. This occurs when the thermal energy provided to the electrons exceeds the work function of the material, allowing them to escape from the surface. The significance of thermionic emission (热电子发射) lies in its application in electronic devices, such as amplifiers, oscillators, and even in certain types of semiconductor technologies.The historical development of thermionic emission (热电子发射) can be traced back to the early 20th century when researchers began to explore the properties of electrons and their behavior under different conditions. One of the key figures in this field was Sir John Ambrose Fleming, who invented the vacuum tube in 1904. This invention relied heavily on the principles of thermionic emission (热电子发射), allowing for the rectification of electrical signals and paving the way for modern electronics.In practical applications, thermionic emission (热电子发射) is utilized in devices like vacuum tubes, which were once the backbone of radio and television technology. These tubes operate by heating a filament, which then emits electrons through thermionic emission (热电子发射). The emitted electrons are then collected at an anode, creating a flow of current that can be amplified and manipulated for various purposes.Moreover, thermionic emission (热电子发射) is not limited to traditional vacuum tubes; it also finds relevance in modern applications such as electron guns used in cathode ray tubes (CRTs) for televisions and computer monitors. In these devices, a focused beam of electrons is generated through thermionic emission (热电子发射), which then strikes a phosphorescent screen to produce images.The study of thermionic emission (热电子发射) has also led to advancements in materials science. Researchers are continually exploring new materials that can enhance the efficiency of electron emission. For instance, materials with lower work functions can facilitate the process of thermionic emission (热电子发射) at lower temperatures, potentially leading to energy-saving technologies.In conclusion, thermionic emission (热电子发射) is a fundamental concept in physics and engineering that has had a profound impact on the development of electronic devices. Its principles are not only essential for understanding historical technologies but also for advancing contemporary innovations. As we continue to explore new materials and applications, the relevance of thermionic emission (热电子发射) will undoubtedly persist, shaping the future of electronics and beyond.