48results about How to "Uniform magnetic field strength" patented technology

A wireless communications headset system for double hearing protection systems that eliminates the problems associated with typical wireless communications systems. The system employs a magnetic-field coupled wireless link from a loop transmitter to a magnetic field receiver. Current through the transmitter wire loops generates magnetic flux which passes through a communications earplug. The earplug has a receiver for converting the magnetic flux to electrical voltage, and this voltage is used to drive a speaker within the earplug. The transmitter can be easily installed into aviation headsets. The loop transmitter has an open center sized so that it fits around the pinna of the human ear enabling a close position to the communications earplug. This close position is advantageous if an efficient system is desired.

The invention relates to a tester for the magnetic property of a magnetostriction material. The tester comprises a main measurement component, a standard force sensor, a stress applying device and a permanent magnet. The main measurement component is composed of an upper loop module, a lower loop module, an upper pole head, a lower pole head, a left exciting coil, a right exciting coil and the magnetostriction material to be tested. The overall structure of the main measurement component is in bilateral symmetry. Through the application of the main measurement component and the stress applying device, the device can test the property of the positive magnetostriction effect and the property of the converse magnetostriction effect, can carry out a magnetic property test under the condition of dynamic excitation, and is simple in structure and high in flexibility.

The invention provides a method for establishing an animal model of an Alzheimer's disease. The method includes feeding a rat for at least 60 days under the condition of exposing to a power-frequency magnetic field; feeding the rat with drug D of galactose and beta of amyloid protein liquid during the process of feeding, and accordingly obtaining the animal model of the Alzheimer's disease. Thus, the method can be a useful supplement of a single-factor-induced animal model of the Alzheimer's disease. According to an embodiment of the method, characteristic pathological changes of the animal of the Alzheimer's disease can be expressed; the method has a characteristic of learning and memory impairment, is consistent with the environmental requirements of long-time and lasting exposure to the power-frequency magnetic field, and has the advantages of stable performance, good reproducibility, and low cost.

The invention relates to a magnetron sputtering plating film cathode device which comprises a target barrel and a magnetic rod tubing, wherein the magnetic rod tubing is arranged in the target barrel. The target barrel comprises a target inner barrel and a spattering target which covers the outside surface of the target inner barrel. A magnet of a spattering magnetic field is arranged in the magnetic rod tubing, and a cooling water passage is arranged in the magnetic rod tubing. The cooling water passage comprises a water inlet passage, a plurality of water inlet holes and water return holes and a water return passage, wherein the water inlet holes and the water return holes are distributed around the magnetic field area in the length direction of the magnetic rod tubing. By arranging thewater outlet holes on the surface near the spattering area of the magnetic rod tubing, the cooling water can be uniformly sprayed to the target inner barrel from the water inlet passage through the water outlet holes. Compared with the traditional single-end water inlet cooling, the cooling effect of the cooling water in the length direction is uniform, the magnetic field strength of the cathode magnetic rod tubing has little change in length direction during rotation, and the temperature difference of the spattering target in the length direction is small, thereby obviously improving the uniformity of the plating film.

The invention is suitable for the field of household electrical appliances, and discloses an induction cooker magnetic strip, an induction cooker coil disc and an induction cooker, wherein the induction cooker magnetic strip includes a magnetic strip body located under the coil, and the magnetic strip body has a top magnetic surface facing the coil and a bottom facing away from the coil. Magnetic surface, the top magnetic surface is a convex arc surface facing away from the bottom magnetic surface, and the top magnetic surface has an inner end close to the center of the coil disk of the induction cooker, an outer end away from the center of the coil disk of the induction cooker, and an inner end located between the inner end and the outer end. The middle part, and the inner end and the outer end are in the same height plane. In the present invention, by setting the top magnetic surface of the magnetic strip of the induction cooker as a convex arc surface facing away from the bottom magnetic surface, it is beneficial to equalize the magnetic field strength in the inner, outer and middle regions of the coil disk of the induction cooker. When working, the temperature in the middle area, inner area and outer area of ​​the coil plate of the induction cooker is close to the same, which improves the uniformity of the heating energy distribution of the induction cooker, and realizes the effect of equivalent heating energy everywhere at the bottom of the pot.