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101results about How to "Improve wetting properties" patented technology

Pulsating heat pipe heat exchanger with lyophilic coatings

The invention discloses a pulsating heat pipe heat exchanger with lyophilic coatings. The pulsating heat pipe heat exchanger comprises an evaporating segment, a heat insulation segment and a condensation segment which are connected in sequence, and the evaporating segment, the heat insulation segment and the condensation segment are filled with heat exchange working media. The pulsating heat pipe heat exchanger is characterized in that the inner wall of the evaporating segment, the inner wall of the heat insulation segment and the inner wall of the condensation segment are coated with the lyophilic coatings corresponding to the heat exchange working media. The lyophilic coating is arranged on the inner wall of a pulsating heat pipe, the thickness and materials of the coatings correspond to the type of the working media injected into the pulsating heat pipe, and therefore the working media can be spread out on the surfaces of the materials well. Due to the lyophilic coatings, the heat exchange process of the liquid phase working media and the wall of the pipe is greatly enhanced, the heat transfer performance of the pulsating heat pipe can be effectively improved, the temperature difference of the evaporating segment and the condensation segment of the pulsating heat pipe is reduced, the work occasion of the pulsating heat pipe heat exchanger is further widened, and the pulsating heat pipe heat exchanger has very good application prospects.
Owner:ZHEJIANG UNIV

Method for monitoring Tg of polymer-based composite material by using carbon nano-paper sensor

The invention belongs to the technical field of characterization of polymer properties, and particularly relates to a method for monitoring a Tg (glass-transition temperature) of a polymer-based composite material by using a carbon nano-paper sensor. The method comprises the following steps: fixing four copper conductors on the surface of rectangular carbon nano-paper to form a carbon nano-paper sensor; embedding the sensor into a prepreg of a polymer-based composite material to be monitored; performing curing molding according to a standard curing process of the prepreg of the polymer-based composite material so as to obtain the polymer-based composite material; heating the composite material again; and measuring the resistance of the carbon nano-paper sensor in the composite material by using a four-probe resistance measuring meter so as to obtain a resistance variation-temperature relation curve of the carbon nano-paper sensor during heating of the composite material after curing molding, wherein a resistance variation catastrophe point of the curve is the glass-transition temperature of the composite material. The method provided by the invention is simple and convenient in measuring process, is feasible, and is low in sensor and demodulating system cost; and most importantly, the method can achieve real-time online monitoring of a molding process of a composite material in the field of engineering application.
Owner:SHENYANG AEROSPACE UNIVERSITY

Titanate-based lead-free silver electrode paste, preparation method and use method thereof

The invention discloses titanate-based lead-free silver electrode slurry, a preparation method and a use method thereof, and belongs to the technical field of preparation of microelectronic components. The silver paste comprises the following components in percentage by weight: 70-85% of high-activity silver powder, 1-5% of glass powder, 10-25% of an organic carrier, 1-5% of an inorganic additiveand 1-5% of a paste modifier. According to the silver paste developed by the invention, the V-B-Si-Zn-Bi-Ti glass frit is used for realizing the lead-free effect of the paste, the lead content of thepaste is less than 100ppm, and the contents of other harmful substances such as Hg, Cd, Cr and the like meet the requirements of RoHS environmental protection indexes; and with the application of thesilver paste in the electrode of the titanate-based 5G microwave ceramic filter, the silver paste with different viscosities can meet the requirements of printing, dip-coating or spraying processes, the adhesive force after sintering is greater than 10N/mm<2>, the solderability is good, the conductivity is excellent, the insertion loss of the filter can be reduced, and the filter has a relativelyhigh quality factor.
Owner:武汉硕美特电子材料有限公司

Preparation process of functional soybean protein concentrate

The invention relates to a preparation process of functional soybean protein concentrate. The preparation process comprises the following steps: (1) putting soybean protein concentrate curd which is prepared by an alcohol extraction process or soybean protein concentrate which is sold on markets and screened by a 80-mesh screen in a dissolving tank; adding 6-15 times of water to mix and stir for 10-20 minutes while controlling water temperature at 50-60 DEG C; (2) using sodium hydroxide to adjust the pH value of the protein liquid to 7.0-8.0 and stirring the protein liquid for 10-20 minutes; (3) using a feeding pump to pump the protein liquid in an ultra-high temperature sterilizer so that the temperature reaches 120-155 DEG C, processing the protein liquid for 1-240 seconds and setting the temperature of a liquid outlet at 40-80 DEG C; (4) pumping the protein liquid in a spray drying tower for spraying and drying; (5) heating phospholipid at different processing stages, wherein the addition of the phospholipid is 0.1-1 percent of the dry weight of protein, and the HLB value of the phospholipid is 4-10; and (6) together adding sucrose ester and / or amber acid direactive glyceride and the phospholipid to the protein liquid, wherein the additions are respectively 0.1-0.5 percent of the dry weight of the protein. The invention remarkably improves the dissolvability of products, achieves the NSI of 50-80 percent and the haloduric index of 30-80 and has light color, mild flavor and good oil and moisture retention.
Owner:天津实发中科百奥工业生物技术有限公司

Silicon controlled thyristor device micro slot group composite phase change integrated cooling heat dissipation method and device

The invention provides a silicon controlled thyristor micro slot group composite phase change integrated cooling heat dissipation method and device, relating to the heat dissipation technology. The method includes that micro dimension composite phase change heat transfer characteristic of thin liquid film evaporation and thick liquid film boiling of liquid in open composite phase change micro slot group in a micro slot group composite phase change heat remover is utilized to remove heat. The device is provided with a micro slot group composite phase change heat remover at the two sides of single silicon controlled thyristor respectively, the silicon controlled thyristor removes heat in multiple groups, each group is provided with a wall type condenser heat dissipation structure, heat emitted by each silicon controlled thyristor can be taken out respectively and is carried into the wall type condenser by steam, condensation heat dissipation is carried out in condensation micro slot thereof, heat is taken away by external cooling water or air, condensed liquid reflows to the micro slot group composite phase change heat remover, and heat dissipation of silicon controlled thyristor with high power, large quantity and strong electric field is realized. The invention is safe and reliable, has small area, high heat-flow density, strong temperature control capability, high efficiency and low energy consumption and can be applicable to integrated cooling heat dissipation of a plurality of high power heat-emitting silicon controlled thyristors.
Owner:INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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