The concept of soft magnetic and soft magnetic core comprises silicon; hard magnetic including aluminum, nickel and cobalt, samarium cobalt, ferrite and NdFeB, which, SmCo magnet is the most expensive, the most expensive ferrite magnets, NdFeB magnets are the highest performance, but the performance is the most stable, best temperature coefficient is Alnico, the user can select different hard magnetic products according to different needs. We are talking about magnets, generally refers to the permanent magnets. Magnet application pigeon enthusiasts medicine knows that if the pigeons fly hundreds of kilometers away, they will automatically homing. Why have such a good pigeon house ability to recognize it? It turned out that pigeons are sensitive to the earth's magnetic field, they can take advantage of changes in Earth's magnetic field to find their home. If tied a magnet in the head pigeon pigeons will trek. If the bird flew over the radio tower, strong electromagnetic interference can cause them to get lost. Magnet speaker magnet in medicine, the use of MRI to diagnose abnormal human tissue to determine disease speaker magnet magnetic field lines, which we are more familiar with the magnetic resonance imaging technology, the basic principle is as follows: the positively charged nucleus with neodymium speaker magnets, and spin motion carried. Under normal circumstances, the arrangement nuclear spin axis is erratic, but will be placed in an external magnetic field, the nuclear spin spatial orientation of the transition from disorder to order. Magnetization vector of the spin system is gradually increased from zero, when the system reaches equilibrium, the magnetization reaches a stable value. If at this time the nuclear spin system is a radio frequency external effects, such as a certain frequency excitation nuclei can cause resonance effects. After the RF pulse stops, has intensified nuclei spin system can not be maintained in this state, will revert to the original arrangement of the magnetic field in the state, while the release of weak energy, radio signals become speaker magnet additive effect, put a lot of signal detection that, when allowed to be spatially resolved, get in motion picture distribution nuclei. MRI is characterized by the flow of the liquid does not generate a signal called flow effect or flow effect blank. So vessels are off-white tubular structures, and blood was no signal black. This makes soft tissue vascular easily separated. Normal cerebrospinal fluid surrounding the spinal cord has a magnet surrounded by cerebrospinal fluid is black, and white fat are set off dura, spinal cord appears as a strong signal structure white. MRI has been used in diagnostic imaging of the whole body system. The best is brain, and spinal cord, heart and great vessels, joints bones, soft tissue and pelvic. Cardiovascular disease can be observed not only the chambers, great vessels and anatomical changes in the valve, but can be used for ventricular analysis, qualitative and semi-quantitative diagnosis, can be used for multiple cutout, high spatial resolution, show the whole picture of the heart and diseases , and its relationship with surrounding structures, better than other X-ray imaging, ultrasonography, radionuclide and CT examination. Speaker magnet fixation | New Tong Xin magnetic | speaker magnet provided by the Dongguan City, Tong Xin magnetic Limited. Dongguan City, Tong Xin magnetic Limited (www.dgxtxmagnet.com/) Dongguan, Guangdong, magnetic leader, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. New Tong Xin magnetic leadership with the staff warmly welcome all inquiries to discuss, with new magnetic Xin Tong better future.