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磁铁的力量：它们如何影响我们的生活

磁铁的力量虽然看起来很小，但在我们的生活中起着至关重要的作用。它以一种无声而坚定的方式影响着我们的日常生活和工作。

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Introduction to Neodymium magnet Neodymium magnet, also known as NdFeB magnet, is a Tetragonal crystal system crystal formed by Nd2Fe14B. In 1982, Sumitomo special metal Masato Sagawa discovered Neodymium magnet. The magnetic energy product (BHmax) of this magnet was larger than that of the Samarium–cobalt magnet, and it was the material with the largest magnetic energy product in the world at that time. Later, Sumitomo Special Metals successfully developed the powder metallurgy process, while General Motors successfully developed the melt spraying process, which can prepare neodymium iron boron magnets. This kind of magnet is a permanent magnet whose magnetism is second only to Absolute zero holmium magnet, and it is also the most commonly used Rare-earth magnet. Neodymium iron boron magnets are widely used in electronic products, such as hard drives, mobile phones, headphones, and battery powered tools.To avoid corrosion damage, it is necessary to perform protective treatment on the surface of permanent magnet mater: 20

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NdFeB Neodymium magnet, also known as NdFeB magnet, is a Tetragonal crystal system crystal formed by neodymium, iron and boron (Nd2Fe14B), which is a kind of rare earth permanent magnetic material. Masato Sagawa of Sumitomo Special Metals Company discovered Neodymium magnet in 1982.The magnetic energy product (BHmax) of neodymium iron boron is larger than that of Samarium–cobalt magnet, and it was the material with the largest magnetic energy product in the world in 1982. Later, Sumitomo Special Metals successfully developed the powder metallurgy process, while General Motors successfully developed the melt spraying process, which can prepare neodymium iron boron magnets. This kind of magnet is a permanent magnet whose magnetism is second only to Absolute zero holmium magnet, and it is also the most commonly used Rare-earth magnet. Because of its excellent characteristics of high remanence, high Coercivity, and high magnetic energy product, it is widely used in devices and equipment with per: 20

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Teaching magnet Teaching magnet is a teaching tool mainly used for teaching experiments and demonstrations (science popularization experiments in primary schools and physics experiments in middle schools). It can also be used for student stationery, children's toys, etc It can not only allow students to intuitively feel the true existence and changes of magnetic fields, but also express their physical characteristics in a concrete and vivid manner. It can also stimulate students' interest in learning, focus their attention, and stimulate their thinking and imagination. This will greatly help and promote the understanding and cognition of magnetic fields among primary and secondary school students and children. Magnetic fields are beneficial and harmless to the human body, and children can also use the N of magnets; The principle of the same polarity repelling the Earth's magnetic field and the opposite polarity attracting is to make a magnet into a compass. To fully mobilize and explore ch: 19

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Magnetic gas experience Researchers at the Massachusetts Institute of Technology used lithium-6 isotopes. Lithium -6 contains three protons, three neutrons and three electrons. It belongs to Fermion (Half-integer spin particle), and has similar characteristics with electrons, which can be used to simulate the behavior of electrons. They used an infrared laser beam to capture the ultracold lithium atomic air mass and cool it to only 15 billionths of a Kelvin higher than Absolute zero. As the atomic repulsion gradually increases, several phenomena observed by researchers indicate that the gas has become highly magnetic. The atomic gas mass first grows and then suddenly contracts. When atoms are released from the trap, they suddenly expand rapidly. These phenomena are completely consistent with the theoretical predictions of magnetic phase conversion.Laser cooling is the preferred method used by physicists to reduce the temperature of gas close to Absolute zero. In order to cool the gaseous lithium to the ideal: 19

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Magnetic gas background The scientific community has debated for decades whether Fermion may have strong magnetism in the gaseous or liquid state, and the MIT research has given an exact answer. Keitler, a physics professor and research team leader at the school, stated that this discovery is very important and will advance people's understanding of the physical phenomenon of magnetism. Magnetic materials have significant application value in data storage, nanotechnology, and medical diagnosis.The announcement said that if this discovery is confirmed, it will rewrite the description of magnetic theory in physics textbooks, indicating that Fermion gas does not need crystal structure to have strong magnetism. Scott Prickard, a professor of physics at the Massachusetts Institute of Technology and another research leader, pointed out: "Our evidence is very convincing, but it is not an easy task to fully prove that (gases have strong magnetism). We did not observe how the atoms point to the region. These atoms: 19

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Magnetic gas The latest answer given by scientists at the Massachusetts Institute of Technology in the United States is that "magnetic gases" can be created through refrigeration technology. Scientists found that when the temperature drops to 0.00015 degrees Celsius from Absolute zero, the gaseous lithium atoms can show their magnetic properties.In essence, the laser is to keep the atoms still and reduce the Thermal motion of the atoms, thereby reducing the temperature of the gas. After the initial expansion of lithium gas clouds, they begin to contract. After the laser is turned off, the contraction has the speed of expansion, indicating that the lithium atoms have become magnetic.From a holistic theoretical perspective, this is very important as it provides us with an easy to understand magnetic property on the smallest possible scale.This experiment does not imply scientific achievements, but rather theoretical breakthroughs that will have the most practical impact. In the field of data storage,: 19

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Differences in magnetic inductance 1. Chip inductor: Inductive components and EMI filter components are widely used in PCB circuits of electronic devices. These components include chip inductors and chip magnetic beads. The following describes the characteristics of these two devices and analyzes their common and special applications. The benefits of surface mount components lie in their small packaging size and the ability to meet actual space requirements. Except for differences in impedance value, current carrying capacity, and other similar physical characteristics, the other performance characteristics of through hole connectors and surface mount devices are basically the same. In situations where chip inductors are required, they are required to achieve two basic functions: circuit resonance and choke reactance. Resonant circuits include resonance generation circuits, oscillation circuits, clock circuits, pulse circuits, waveform generation circuits, and so on. The resonant circuit also includes a high Q bandpass: 19

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Principle of Magnetic Beads FerriteBead is a rapidly developing anti-interference component that is cheap, easy to use, and has a significant effect on filtering high-frequency noise.The main raw material of magnetic beads is ferrite. Ferrite is a kind of Ferrimagnetism material with cubic lattice structure. The ferrite material is iron magnesium alloy or iron nickel alloy, and its manufacturing process and mechanical properties are similar to ceramics, with a gray black color. A type of magnetic core commonly used in electromagnetic interference filters is ferrite material, and many manufacturers provide ferrite materials specifically for electromagnetic interference suppression. The characteristic of this material is that it has very high high-frequency losses and high permeability, which can minimize the capacitance generated between the coil windings of the inductor under high-frequency and high resistance conditions. The most important performance parameter for ferrite used for suppressing electromagnetic in: 18

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Magnetic bead Magnetic beads are specifically designed to suppress high-frequency noise and peak interference on signal and power lines, and also have the ability to absorb electrostatic pulses. Magnetic beads are used to absorb Super high frequency signals. For example, some RF circuits, PLLs, oscillation circuits, and Super high frequency memory circuits (DDRSDRAM, RAMBUS, etc.), magnetic beads need to be added to the power input part. Inductors are energy storage elements, which are used in LC oscillation circuits, medium and low frequency filter circuits, etc., and their application frequency range rarely exceeds 50 MHz.The main function of magnetic beads is to eliminate RF noise present in transmission line structures (circuits). RF energy is the AC sine wave component superimposed on the DC transmission level, and the DC component is the useful signal required. However, RF energy is useless electromagnetic interference transmitted and radiated along the line (EMI). To eliminate these unnecessa: 18

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Magnetic bead function In a circuit, as long as the wire passes through it, it can be used (I use wires that look like ordinary resistors, and the wires have been threaded and glued, and there are also surface mount forms, but I rarely see them sold). When current passes through a wire, ferrite has almost no impedance to low-frequency currents, while it has a significant attenuation effect on higher frequency currents. The high-frequency current is dissipated in the form of heat, and its equivalent circuit is a series connection of an inductor and a resistor, with the values of both components proportional to the length of the magnetic bead. There are many types of magnetic beads, and manufacturers should provide technical specifications, especially the impedance frequency curve of the magnetic beads.Some magnetic beads have multiple holes, and using wires to pass through them can increase the impedance of the component (the square of the number of times the magnetic beads pass through). However, the increas: 18

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