If there is no [magnet] powerful magnet, where there is magnetism? Slowly progressive era, a magnet generations are the times. In medicine, the use of MRI to diagnose abnormal tissue magnet body to determine the disease, this is what we are more familiar with magnetic resonance imaging technology, the basic principles are as follows: positively charged nuclei of rare earth permanent magnet, and spin motion. 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. MRI is characterized by the flow of the liquid does not produce a signal called flow effect or effects flow gaps. Therefore vascular tubular structure is off-white, and black blood is no signal. This allows blood vessels and soft tissue can easily be separated. Surrounding normal cerebrospinal fluid surrounding the spinal cord, cerebrospinal fluid for black and white of the fat off dura, spinal cord appear as strong white signal structure. Permanent magnet and non-magnet sub-permanent magnets. The permanent magnet may be a natural product, also known as natural magnet to be manufactured by a human (the strongest magnets are NdFeB magnets). Non-permanent magnet is heated to a certain temperature suddenly loses its magnetic properties, which is due to the large magnet arrangement consisting of "meta magnet" of from order to disorder caused; magnet loses its magnetism put into a magnetic field, when the magnetization reaches a certain value, it is magnetized magnet perforated circular arrangement of "meta-magnet" in and from disorder to order. In fact, not a permanent magnet permanent magnet external factors will change not only the high-temperature magnetic, impact will make it loses its magnetism, strong magnetic fields can also change its magnetic poles and the strength of the magnetic field generated by the alternating current changes in the size can quickly to the magnetic member. Tong Xin _ new super magnet magnetic magnets _ provided by the Dongguan City, Tong Xin magnetic Limited. Xin Tong, Dongguan City, the new magnetic Limited (www.dgxtxmagnet.com/) is Dongguan, Guangdong, magnetic leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In the new Tong Xin magnetic leadership with the staff warmly welcome all inquiries to discuss, with new magnetic Tong Xin a better future.