The discovery of C60 originally began in the field of astronomy research, and then through experimental preparation. The discovery of C60 began in the field of astronomy, where scientists first became interested in the widespread distribution of carbon dust among stars. [Answer] : In 1985, the British scientist H.W. Kroto and the American scientists R.F. Krol and R.E.Malley and others used laser gasification experiments for graphite to find C60, and then found C50, C70, C240 and even C540. fullerenesAmong them, C60 has been studied most deeply, and its research field not only involves various branches of chemistry, but also involves life science, materials science and solid state physics.
year, scientists found that C60 mixed with a small amount of certain metals have superconductivity, and the production process of this material is simpler than the production of traditional superconducting materials - ceramics, the texture is very hard, so it is predicted that C60 has broad application prospects in the field of superconducting materials. The carbon-60 molecule, commonly known as a buckyball, is made up of 60 carbon atoms that form a cage-like structure.
is from Rice University in Houston, USABother. When the primary current of the ignition coil is disconnected, the induction potential is generated in the primary winding, which is accompanied by high frequency oscillation due to the existence of inductance and capacitance. This high frequency electromotive force will produce a strong field intensity interference wave, interfering with radio equipment. By bypassing the capacitor, the signal that interferes with the radio can be eliminated or reduced.
Hello, it is shielding electronic signal interference to ensure the normal operation of the ignition coil! Hope I can help you! [The car has a problem, ask the car master. 4S shop professional technician, 10 minutes to solve.
The capacitor on the ignition coil of the car plays a role in preventing radio interferenceWhen the primary current of the firecoil is disconnected, high frequency oscillations are generated, which can cause interference to the radio equipment. Therefore, the parallel capacitor at the ignition coil of the vehicle can eliminate or reduce this interference signal. In addition, the capacitor can also play a role in preventing current mutations and maintaining the stability of the circuit.
protection platinum (breaker contact); Quickly absorb the self-induced electromotive force generated by the ignition coil when the ignition coil is disconnected, accelerate the power failure speed of the primary coil of the ignition coil, increase the secondary voltage of the ignition coil, and improve the ignition effect.
In the precise construction of automotive ignition systems, capacitors are indispensable componentsPlayed a key role. When the primary current is interrupted in the primary winding of the ignition coil, it will produce an induced electromotive force with an extremely fast speed change, accompanied by high frequency oscillations, and its field strength is strong enough to have a serious impact on the surrounding radio equipment, if not properly contained, it may cause serious interference phenomena.
"Nuclear Magnetic Resonance" abbreviation: NMR Nuclear magnetic resonance (NMR) is a physical phenomenon.
The spin of the nucleus. Nuclear magnetic resonance is mainly caused by the spin motion of atomic nuclei. Different nucleiThe case of spin motion is different and can be expressed by the spin quantum number I of the nucleus. There is a certain relationship between the spin quantum number and the mass number and atomic number of the atom. The nucleus is a positively charged particle; the nucleus that cannot spin has no magnetic moment; the nucleus that can spin has a circulating current, which produces a magnetic field, forming a magnetic moment (μ).
Indications of nuclear magnetic resonance (MR) (suitable for examination) : Indications of central nervous system magnetic resonance examination: MR Has the best display for brain and spinal cord lesions, which is significantly better than CT because of its good image contrast and resolution, which can be directly displayed from the sagittal plane, axial plane and coronal planeAnd there are no bone artifacts.