2. The Doppler effect was named in memory of Austrian physicist and mathematician Christian John Doppler, who first put forward this theory in 1842. Doppler believes that the wavelength of object radiation changes because of the relative motion between the light source and the observer. In front of the moving wave source, the wave is compressed, the wavelength becomes shorter and the frequency becomes higher (blue shift). Behind the moving wave source, the opposite effect is produced. The longer the wavelength, the lower the frequency (red shift).
3. Catfish effect Catfish effect is to adopt a means or measures to stimulate some enterprises to actively participate in market competition, thus activating related logistics enterprises in the market. Its essence is a negative incentive and the mystery of activating employees.
Catfish, an active fish, is nothing special. However, since some fishermen used it as a tool to ensure the survival of sardines in long-distance transportation, the role of catfish has been paid more and more attention. Sardines naturally like to be quiet and pursue stability. I don't have a clear understanding of the dangers I face, but I am very comfortable with my present life. Fishermen skillfully use the active function of catfish to ensure that sardines are alive, and also get the greatest benefit in the process.
4. The energy produced by domino effect is enormous.
The physical reason for this effect is that when the domino stands upright, its center of gravity is higher, but when it falls down, its gravitational potential energy is converted into kinetic energy. When it falls on the second card, the kinetic energy is transferred to the second card, and the second card transfers the sum of the kinetic energy transferred from the first card and the kinetic energy converted from its own gravitational potential energy in the falling process to the third card. ...
Zeeman effect is a phenomenon that atomic spectral lines split in an external magnetic field. Zeeman effect was discovered by Dutch physicist Zeeman in 1896. He found that atomic spectral lines split in an external magnetic field. Then Lorenz explained theoretically why the spectral line split into three lines. This phenomenon is called Zeeman effect.
6. Field effect English: Field effect defines the electronic effect transmitted directly through space and solvent molecules. Field effect is a long-distance polar interaction, and it is a polar effect when the action distance exceeds two C-C bonds. Field effect and induced effect are often in the same direction, so it is generally difficult to distinguish the two effects.
7. English name of spillover effect: definition of spillover effect 1. The development of one aspect of a thing drives the development of other aspects. 2. The influence of the increase of one country's total demand and national income on other countries. 3. Spillover effect, with technology spillover effect, is that multinational companies are the main inventors and providers of advanced technologies in the world, and realize their technology transfer through the internalization of foreign direct investment. This kind of technology transfer will bring external economy to the host country, that is, technology spillover.
8. Acousto-optic effect When ultrasonic waves pass through the medium, it will cause local compression and elongation of the medium, resulting in elastic strain, which changes periodically with time and space, making the medium in a dense and alternating state, just like a phase grating. When light passes through this medium disturbed by ultrasonic waves, it will be diffracted, which is called acousto-optic effect.
9. Leverage effect
"Leverage effect" is the original mechanism of futures trading, that is, the margin system. The "leverage effect" not only enlarges the tradable volume of investors, but also doubles the risks taken by investors.
10. Curve effect In the change of balance of payments caused by exchange rate adjustment, due to the existence of time lag, the balance of payments will deteriorate first and then improve, which is the so-called J-shaped curve effect.