Thirties late 1930s, alnico magnet successful development, it makes possible large-scale application of the magnet. Fifties fifties solenoid magnet where concessions, barium ferrite magnets appear lifting magnets, permanent magnet not only reduces the cost, scope of application of permanent magnet materials in turn broaden the high-frequency fields. Sixties to the sixties, there SmCo permanent magnet, the magnet was applied opened up a new era. So far, the rare earth permanent magnet has experienced first-generation SmCo5, the second generation of precipitation hardening Sm2Co17, third generation Nd-Fe-B permanent magnet materials. Ferrite magnets are still present, the largest amount of permanent magnet materials, NdFeB magnets but has greatly exceeded the value of the ferrite permanent magnet materials, NdFeB magnet production has become a major industry. Warring States Period magnetic phenomena found our ancestors have accumulated a lot of understanding in this area, often encountered in the search for iron ore magnetite, that magnet (the main ingredient is iron oxide). These findings have long been documented down. "Tube" of several articles in the earliest records of these findings: "the mountains are a magnet who, under which a bronze." Can show the unit increment equal to the outside world to send it to joules. Only meaningful when the energy transfer can not say how much heat an object with position and speed permanent magnet state amount of kinetic energy momentum angular velocity pressure volume temperature enthalpy entropy change of free energy permanent magnets during impulse function within their means changing the amount of heat speed permanent magnet exercises. Acting and heat transfer is equivalent to refer here. It enables objects to change the same temperature. It enables objects to increase the same heat. It enables the object changed by the same internal energy. It is essentially the same phenomenon in which the following is by way of heat transfer can be changed within the object. Open the light switch inside the filament temperature can be increased. Summer soda on ice to hot weather. Cuocuo Shou winter will feel the hand become warm up. Solar water heaters in a sunlit water temperature gradually increased Xuehaiwuya Crossroads learn more secondary school secondary education accompanied trip Miles victory is a little progress every day. Double-elect the following statements is correct about the heat. High temperature heat contained in the multi-object. Contained within an object can have more calories and more. Heat within the same power and energy units. Process heat and power is the amount of internal energy is a state on the amount of heat transfer of the following statements is correct. Essence of heat transfer is the transfer of temperature. Temperature difference between the heat transfer objects competence occur. Lifting magnets | Magnet | New Tong Xin magnetic provided by the Dongguan City, Tong Xin magnetic Limited. Xin Tong, Dongguan City, the new magnetic Limited (www.dgxtxmagnet.com/) strong, credible, in Dongguan, Guangdong magnetic materials industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the new Tong Xin magnetic and you hand into the brilliant, for a better future!