68results about How to "Eliminate temperature gradients" patented technology

The invention discloses a method for preparing hydrated alumina. The method comprises the following process that: (1) bottom water is added into a neutralization reactor and is heated to 50-95 DEG C, an acid aluminium salt water solution is added at the same time so as to control the pH value between 2 and 4, and the pH value is stabilized for a while; (2) the acid aluminium salt water solution and alkali metal aluminate (or alkaline precipitator) solution to regulate the pH value between 6 and 8, and the pH value is stabilized for a while; the alkaline precipitator solution (or the alkaline precipitator solution) is added to regulate the pH value to be between 8.5 and 12, and the pH value is stabilized for a while; (4) the acid aluminium salt water solution is added to regulate the pH value to be between 2 and 4, and the pH value is stabilized for a while; (5) the alkaline precipitator solution or the alkaline precipitator solution is added to regulate the pH value to be between 8.5 and 12, and the pH value is stabilized for a while; the steps (4) and (5) are repeated for 1-4 times; (7) after gelatinizing is completed, aging, filtering, washing and drying are carried out to obtain the hydrated alumina; and the steps (1)-(3) are carried out under the action of ultrasonic waves, and the frequencies of the ultrasonic waves are10-80 kHZ. The hydrated alumina which is prepared through the method is distributed in a centralized manner and has high crystallinity and large pore volumes and pore diameters.

The invention discloses a preparation method for a nano-flake SnS2 sodium-ion battery negative electrode material with good rate capability, comprises: 1) preparing an Sn source solution A with the concentration of 0.5-1.2 mol / L, regulating the pH of the solution A to be 1-9; and preparing an S source solution B with the concentration of 0.1-2.4 mol / L; 2) mixing the solution A and the solution B at an element molar ratio of nSn: nS being equal to (1.0-2.5): (2.0-4.3), and uniformly stirring to form a solution D; 3) putting the solution D into a homogenous phase hydrothermal reaction kettle for performing a homogenous phase hydrothermal reaction; and 4), cooling the reaction kettle, then centrifuging, washing, separating and drying to obtain the nano-flake SnS2 sodium-ion battery negative electrode material, wherein under 100 mA / g current density, the initial discharge capacity of the negative electrode material reaches 745 mAh / g; and after circulating for 100 times, the capacity is kept at 560 mAh / g.

The invention provides a black rice anthocyanin extracting method. The black rice anthocyanin extracting method specifically comprises the following steps: taking a black rice grain as a material, preprocessing the black rice grain, coarsely extracting the anthocyanin in the black rice grain, and then sequentially perform ultrafiltration, nanofiltration, macroporous resin adsorption, ethyl alcohol elution, secondary nanofiltration, and freeze-drying in vacuum to obtain a freeze-dried powder of the black rice anthocyanin. The black rice anthocyanin extracting method provided by the invention is good in selectivity; impurities of polysaccharide, organic acids, proteins and the like in the black rice anthocyanin can be effectively separated; the extracting rate is high, the product quality is high, even trace of the black rice anthocyanin is also extracted, the extracting speed is high, the operation is simple, and the discharge of effluent is low.

The invention discloses a high-viscosity fluid temperature characteristics testing bedstand and a method, wherein the high-viscosity fluid temperature characteristics testing bedstand comprises a hydraulic system, a data collecting system, a water bath circulating heating system, a fluid conveying cylinder 1, a fluid conveying cylinder 2, a testing pipeline and an oval gear flowmeter, the hydraulic system comprises a hydraulic cylinder 1 and a hydraulic cylinder 2, the water bath circulating heating system comprises a constant temperature water bath tank, a water tank 1, a water tank 2, a hot water pump 1, a hot water pump 2 and a hot water pump 3, and the testing pipeline comprises a water bath heating segment and a testing segment. The method pushes fluid in the fluid conveying cylinder 1 and the fluid conveying cylinder 2 to enter the testing pipeline to heat through water bath depend on the hydraulic system, tests pressure drop of the fluid in the testing pipeline through the data collecting system, and inspects flow rate during the testing process through the oval gear flowmeter. The high-viscosity fluid temperature characteristics testing bedstand and the method achieve development of pipe mobility under the coupling influence of accurate control temperature of the fluid in the testing pipeline, large span velocity control and multiple factors.

The invention discloses a preparation method of a SnS2 / SnO2 lithium ion battery anode material in hollow-sphere structure. The method includes: 1) adding SnCl4.5H2O in a mixed liquid of deionized water and anhydrous ethanol to fully dissolve the component for forming a solution A, and dissolving NaOH in the solution A to prepare a solution B; 2) under stirring, adding urea to the solution B and continuously stirring the solution to prepare a uniform mixed solution C, and performing a homogeneous hydrothermal reaction on the mixed solution C; 3) after the reaction is finished, washing and drying a product to obtain a SnO2 precursor; 4) heating the SnO2 precursor to burning to prepare SnO2 powder; 5) dispersing the SnO2 powder in ethanol with stirring to prepare a uniform mixed suspension D;6) adding SnCl4.5H2O and TAA to the suspension D with stirring until the components are completely dissolved to obtain a homogenous suspension E; 7) performing a microwave thermal reaction on the suspension E, when the reaction is finished, moving-out and washing and drying the product to prepare the SnS2 / SnO2 lithium ion battery anode material in hollow-sphere structure.

The invention aims at providing a pantoprazole sodium freeze-dried powder injection and comprises pantoprazole sodium and mannitol with the weight ratio of 1: 2 to 5. The invention is simple in formula and little in side effect; products prepared by the method are plump in appearance, good in complex solubility and excellent in quality with the adoption of an advanced freezing and drying process.

The invention provides a laser frequency stabilization method and device based on a temperature self-sensing flexible film heater. The positive electrode and the negative electrode of a double-longitudinal-mode laser power supply are connected with the two ends of a laser tube respectively. The laser tube is nested in a heat conduction shell and is arranged in a heat isolation layer; the positions, close to the two ends of the laser tube, of the heat dissipation layer are each provided with a light transmitting hole. The polarizing beam splitter is arranged outside one of the light transmitting holes; the light power conversion circuit is arranged on a reflection and refraction light path of the polarizing beam splitter, the flexible film, the temperature measurement circuit and the A / D conversion circuit are sequentially connected in a one-way mode, the temperature sensor is bonded to the outer wall of the heat dissipation layer, and the temperature sensor is connected with the microprocessor in a one-way mode. According to the method, the frequency reproducibility of the laser can be improved from 10 <-8 > to 10 <-9 >, the thermal hysteresis effect generated by heat transfer is avoided, and real-time and accurate temperature data are provided for a frequency stabilization algorithm of the laser.

The invention discloses a heat-conducting film and application. The heat-conducting film is prepared from the following raw materials in parts by weight: 80-160 parts of ethyl acetate, 10-80 parts of a polyimide emulsion, 80-120 parts of an acrylic ester adhesive, 0.05-0.5 part of a cross-linking agent, 10-110 parts of graphene, 0.1-2 parts of a coupling agent, 0-8 parts of a dispersing agent, 110-180 parts of butanone, 0.1-2 parts of an additive and 110-170 parts of toluene. The heat-conducting film is prepared through the steps of weighing ethyl acetate, the polyimide emulsion, the acrylic ester adhesive, cross-linking agent, graphene, the coupling agent, the dispersing agent, butanone, the additive and toluene according to parts by weight; and sintering in a nitrogen condition at a high temperature of 800-3,000 DEG C. The prepared heat-conducting film is light in weight, small in thickness, good in toughness and excellent in heat-conducting property, and can be widely applied to the fields of a smart phone, a tablet computer, LED lighting equipment, a smart television, semiconductor manufacturing equipment and automotive electronic equipment. The used raw materials are wide in source, simple and controllable in preparation, extremely low in production cost and suitable for industrial production.

The present invention proposes a laser frequency stabilization method and device based on a temperature self-sensing flexible film heater. The heat conduction shell is arranged in the heat insulation layer, and the heat dissipation layer has a light transmission hole near the two ends of the laser tube, and the polarizing beam splitter is arranged outside one of the light transmission holes. The optical power conversion circuit is arranged on the reflection and refraction optical path of the polarization beam splitter, the flexible film, the temperature measurement circuit and the A / D conversion circuit are sequentially connected in one direction, and the temperature sensor is bonded to the outer wall of the heat dissipation layer. The temperature sensor is unidirectionally connected with the microprocessor. The method of the present invention can make the frequency repeatability of the laser from 10 ‑8 up to 10 ‑9 , The device of the present invention avoids the thermal hysteresis effect caused by heat transfer, and provides real-time and accurate temperature data for the frequency stabilization algorithm of the laser.