35results about How to "Increase magnetic saturation" patented technology

Thermally annealed superparamagnetic core shell nanoparticles of an iron oxide core and a silicon dioxide shell having high magnetic saturation are provided. A magnetic core of high magnetic moment obtained by compression sintering the thermally annealed superparamagnetic core shell nanoparticles is also provided. The magnetic core has little core loss due to hysteresis or eddy current flow.

The invention provides a coupling signal transmitting device, comprising a handleless upper clamp device, a handle lower clamp device and a driving gear device with a handle, the handleless upper clamp device and the handle lower clamp device are semicircular Structure, the driving gear device with handle is fixed on the tail of the handleless upper pincer device, the tail of the handleless upper pincer device and the handle lower pincer device are combined through positioning pins and positioning tables of the two shells. The handleless upper pincer device includes a handleless pincer shell, an upper half magnetic core, an excitation coil 1, an upper magnetic conducting sleeve, and an upper stroke guide rail; the described lower pincer device with a handle includes a handle pincer shell 1. Lower half magnetic core, excitation coil 2. Lower magnetic sleeve, lower stroke guide rail; can effectively solve the problem that the accuracy and effectiveness of the test are affected by the impact deformation of the magnetic core and the leakage of the magnetic induction line.

The invention discloses an IGBT-based asynchronous trigger high-voltage pulse modulator, which belongs to the field of high-voltage pulse modulation circuits. The modulator includes a pulse generating device, an optical fiber transmission device, a delay module, a signal processing module, a truncated pulse generating module, a driving gate circuit module, a sixteen-level IGBT pulse forming device, and a power supply. The present invention adopts a pulse forming device with an additive superposition structure and a gate truncated pulse discharge circuit, which is triggered by an asynchronous signal, which can not only greatly reduce the overshoot of the output pulse, but also make the rising edge and falling edge of the pulse steeper. Thus, a high-voltage pulse signal output with a narrower pulse width can be realized.

The invention discloses a method capable of improving magnetic saturation of hard alloy pre-sintered blanks. The method comprises the following steps that a proper amount of solid paraffin is taken, and is put into a preset utensil; the utensil where the solid paraffin is put into is placed on a heating device for heating, and is heated until the solid paraffin is melted to be in a liquid state; the hard alloy pre-sintered blanks are put into the utensil in a batch mode, and are completely soaked in the paraffin in the liquid state; the temperature in the soaking process is controlled, and thehard alloy pre-sintered blanks are soaked for a certain time according to the carbon content requirements of the pre-sintered blanks; and when the soaking time is up, the hard alloy pre-sintered blanks are taken out, and then are sintered according to a conventional sintering method in the prior art, so that hard alloy products with improved magnetic saturation and uniform magnetic saturation areobtained. According to the method, through the improvement of the process, the magnetic saturation of the hard alloy pre-sintered blanks can be effectively improved, and the magnetic saturation is uniform and controllable.

A method for improving carbon potential of a low-carbon hard alloy is characterized in that gas carbonizing treatment is carried out on the low-carbon hard alloy, wherein gas carbonizing treatment comprises the following steps that firstly, the low-carbon hard alloy is arranged in a sintering furnace, the room temperature is raised to 1,340 DEG C to 1,400 DEG C, then, the temperature is kept for 30-180 min, during the temperature keeping time, mixed gas of H2 and CH4 is introduced into the sintering furnace in a pulse manner, low pressure is adopted after high pressure is adopted, the high pressure ranges from 200 mbar to 800 mbar, and the lower pressure ranges from 10 mbar to 50 mbar; moreover, the pulse period ranges from 5 min to 10 min, the time ratio of the high-pressure stage to the low-pressure stage ranges from 2: 1 to 4: 1; secondly, the low-carbon hard alloy is cooled to 1,270 DEG C to 1,330 DEG C, then, the temperature is kept for 30 min to 180 min, and during the temperature keeping time, inert gas with the pressure ranging from 1,000 mbar to 2,000 mbar is introduced into the sintering furnace; and thirdly, the low-carbon hard alloy is cooled to the room temperature, and the product is taken out of the furnace.

The invention discloses a manufacture method of a silver hybridization mesoporous ferroferric oxide antibiotic immunosensor and the application thereof. The manufacture method of the electrochemical immunosensor includes modifying thionine-graphene mixed solution on the surface of a glassy carbon electrode, conducting cross linking on an antibiotic antibody incubated by Ag-Fe3O4 mesoporous nanometer particles, closing non-specificity active sites by bovine serum albumin to manufacure the antibiotic electrochemical immunosensor. A detection method of antibiotic is that a reference electrode-saturated calomel electrode, an electrode-platinum filament electrode and a working electrode are correctly connected on an electrochemical working station, and immunodetection is conducted through the square wave voltammetry. The antibiotic electrochemical immunosensor has high sensitivity and selectivity, is simple in detection method and has the advantages of being quick, high in efficiency, good in specificity, low in cost, convenient to operate and the like. It takes to 2-3 minutes to finish one detection process.

The invention discloses a ferrite material, small large-current laminated-chip wideband magnetic beads, and a preparation method thereof. The ferrite main materials comprise: 49-55mol% of Fe2O3, 25-35mol% of ZnO, 4-8mol% of CuO, 8-15mol% of NiO, 0.1-0.6mol% of Co3O4, 1-3mol% of Bi2O3, and 0.5-1.5mol% of Nb2O5. The magnetic bead preparation method comprises the steps of ferrite slurry preparation, material band dry preparation, cutting, ferrite material sheet punching, ferrite material sheet printing, ferrite material sheet lamination, cutting and forming, and the like. With the ferrite material, magnetic saturation degree is improved, and direct current resistance is reduced, such that larger current can be withstood. According to the magnetic bead preparation method, production period is shortened, and production efficiency is improved. The volume of the magnetic beads is small. The magnetic beads have good electromagnetic interference inhibition capacity from 100MHz to higher than 1GHz.

Thermally annealed superparamagnetic core shell nanoparticles of an iron-cobalt alloy core and a silicon dioxide shell having high magnetic saturation are provided. A magnetic core of high magnetic moment obtained by compression sintering the thermally annealed superparamagnetic core shell nanoparticles is also provided. The magnetic core has little core loss due to hysteresis or eddy current flow.