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62results about How to "Overcome adverse effects" patented technology

Method for preparing yttrium-doped nano aluminum nitride powder

The invention discloses a method for preparing yttrium-doped nano aluminum nitride powder. The method comprises the following steps of: dissolving an aluminum source, a carbon source and an yttrium source into a solvent, and then mixing the solvent and an ethylene glycol solution of citric acid; and preserving the heat of the mixed solution for 2 to 4 hours at the temperature of between 125 and 135 DEG C, continuously heating the mixed solution to the temperature of between 180 and 220 DEG C, preserving the heat for 2 to 4 hours, calcining the obtained substance at the temperature of between 800 and 1,200 DEG C in vacuum or nitrogen, cooling, grinding, performing carbothermic reduction reaction at the temperature of between 1,450 and 1,550 DEG C, and thus obtaining the yttrium-doped nano aluminum nitride powder. By using the complexing effect of the citric acid and the steric hindrance effect of the ethylene glycol, the aluminum and yttrium ions are uniformly distributed in the carbonsource, and the yttrium-doped nano aluminum nitride powder with small particle diameter and uniform components is finally obtained; and the yttrium-doped nano aluminum nitride powder can effectively reduce the sintering temperature of aluminum nitride ceramic and improve the heat conductivity of the aluminum nitride ceramic, and has an important application prospect in electronic substrates and power devices.
Owner:CHINA JILIANG UNIV

Unmanned aerial vehicle airborne platform-based vehicle type identification method

The invention discloses an unmanned aerial vehicle airborne platform-based vehicle type identification method and belongs to the technical field of video images. The method comprises the following steps of S1: adjusting the height of an unmanned aerial vehicle above the ground to a position suitable for vehicle type identification; S2: acquiring infrared image positive and negative samples used for vehicle target detection offline, performing characteristic extraction by utilizing a convolutional neural network (CNN), and performing support vector machine (SVM) training to obtain an SVM classifier model used for online vehicle type identification; S3: performing infrared photography by utilizing an infrared video camera to obtain a video image signal; and S4: performing sliding window sampling on a shot infrared image sequence, extracting vehicle type characteristics by utilizing the CNN, and inputting the characteristics in the classifier model obtained in the step S2 to perform classification. According to the method, the vehicle type identification can be finished in the day, at night and under the condition of severe weather condition and relatively low visibility by adopting the infrared video camera; and meanwhile, the method can be used for dynamically selecting a detection region, so that the flexibility of a detection system is improved.
Owner:CHONGQING UNIV

Laser annealing technique on the wafer back of IGBT high voltage power device

ActiveCN101217115ASolve the problem of not being able to perform good annealingAchieve activationSemiconductor/solid-state device manufacturingHigh pressureIon implantation
The invention discloses a wafer back surface laser annealing process of an IGBT high-voltage power device, which pertains to the semiconductor manufacturing technical scope. The invention adopts a scanning mode to carry out the laser annealing, a silicon wafer back surface is controlled to do the reciprocating uniform linear motion along the vertical direction of a long strip-shaped laser spot, so as to form the laser spot to carry out the scanning of the entire area of the silicon wafer back surface, increase the temperature of a surface layer of the silicon wafer back surface and generate the uniform annealing effect. The usage of the proposal of the invention can solve the problem that a P-shaped doping layer can not carry out good annealing processing after the ion injection, so a good ohmic contact is formed between a collector metal layer and the P-shaped doping layer which is close to the silicon wafer. The invention uses a laser with the shorter wavelength, the penetration depth of the laser on the silicon wafer back surface is limited, the invention can not only faster realize the activation of impurities, but also generate the adverse effects on other structural parts of the IGBT high-voltage power device; the usage of the technology can obtain the IGBT high-voltage power device with the smaller on-state resistance.
Owner:TSINGHUA UNIV

Mountain road curve vehicle crossing early warning method based on videos

The invention discloses a mountain road curve vehicle crossing early warning method based on videos, and belongs to the technical field of video images. The method includes the following steps of firstly, conducting infrared camera shooting through an infrared camera to obtain video image signals; secondly, conducting vehicle target detection through a self-adaptive Gaussian mixture modeling method to obtain vehicle characteristics; thirdly, calculating the average vehicle area of multiple frames, and judging the running directions of vehicles; fourthly, conducting vehicle tracking on vehicle targets entering the camera shooting range through the MeanShift algorithm; fifthly, measuring vehicle speeds through the angular point characteristic matching algorithm, comparing the vehicle speed with the maximum regulated vehicle speed at a curve, and conducting front road condition information display and real-time voice prompting or early warning on the two ends of the curve. By means of the infrared camera, the vehicle target detection can be completed under the conditions that the weather is bad and visibility is low, the curve vehicle crossing early warning is conducted through information display and real-time voice broadcasting, and the aim of comprehensive effective early warning in the running process is achieved.
Owner:CHONGQING UNIV

Energy management method considering random forecast error of independent microgrid

The invention provides an energy management method considering a random forecast error of an independent microgrid. The independent microgrid comprises a wind power-photovoltaic-micro gas turbine-energy storage battery and an energy management system (EMS), wherein the EMS is used for monitoring a state-of-charge (SOC) state of the energy storage battery in real time, monitoring wind power and photovoltaic actual generation power and measuring actual powers of the micro gas turbine and the energy storage battery, a random forecast error of a net load is obtained according to powers which are forecasted and actually monitored, the contribution of the controllable micro gas turbine and the energy storage battery are arranged and adjusted by a multi-variable and multi-constraint mathematicaloptimization method and a set process according to the size of the random forecast error of the net load, so that the energy storage battery normally runs. According to the method provided by the technical scheme, the unfavorable influence brought by the forecast error of the load and a regenerative energy power is overcome, the contribution of the controllable micro source and energy storage arearranged and adjusted by the mathematical optimization method according to the size of the random forecast error of the net load, and stable, reliable and economic running of the microgrid is achieved.
Owner:HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL

Cellulose-reinforcement disc-adhesion-prevention squeaking-prevention abrasion-resistant braking material and preparation method thereof

The invention discloses a cellulose-reinforcement disc-adhesion-prevention squeaking-prevention abrasion-resistant braking material and a preparation method thereof. The braking material comprises, by weight, the main raw materials of 6-18 parts of natural cellulose subjected to flame retarding, thermal stabilization and surface treatment (the surface of the cellulose is coated with coupling agents with 1-3% weight), 8-24 parts of modified resin matrixes, 3-12 parts of core-shell rubber powder, 3-9 parts of epoxidation vegetable oil, 5-15 parts of friction conditioning agents, 6-12 parts of carbonaceous materials and the balance of barium sulfate used for filling to 100 parts. The preparation method includes the steps that the natural cellulose is subjected to flame retarding and stabilization treatment, then the coupling agents are sprayed to the natural cellulose, the natural cellulose is suspended to be opened, heating is performed at 30-90 DEG C until the coupling agents are completely soaked, the cellulose subjected to surface treatment and other components are mixed inside a Z-type stirring machine to obtain mold pressing powder, the mold pressing powder is formed at 120-160 DEG C and 5-10 Mpa in a hot pressing mode, hot pressing time is determined according to the thickness of a product and is generally 1.5-3 min/mm for fitness. The components with porous structures are added into the ingredients, so that a brake pad has the disc-adhesion-prevention, squeaking-prevention and abrasion-resistant effects.
Owner:SHANDONG UNIV

Horizontal high-voltage super junction power semiconductor device

The invention relates to a power semiconductor technique, in particular to a charge-compensation horizontal high-voltage super junction power semiconductor device. According to the horizontal high-voltage super junction power semiconductor device, the surface of a P type substrate layer is covered by an N type charge compensation layer. The N type charge compensation layer comprises various doping method of uniform doping, linear doping, disperse doping and the like. The linear doping can obviously reduce the auxiliary exhaust function of a substrate. The horizontal high-voltage super junction power semiconductor device has the advantages of using an injection selection function to adjust the doping concentration based on the linear doping to obtain an optimized doping method, fully takes ideal substrate conditions and charge balance conditions of equivalent substrates into consideration, well overcomes the effects of the auxiliary exhaust functions of substrates and enables a super junction LDMOS to achieve the optimal pressure resistance. The horizontal high-voltage super junction power semiconductor device is especially applied to the field of horizontal high-voltage super junction power semiconductor devices.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA +1

Steel casing installation device and installation method at complex terrains

The invention discloses a steel casing installation device and installation method at complex terrains. The steel casing installation device at the complex terrains comprises a guide frame and a vibrating sinking device. The guide frame comprises an inner frame body and an outer frame body which are nested from the inner side to the outer side. The cross sections of the inner frame body and the outer frame body are both of square shapes. Four corners of the top face and the bottom face of the inner frame body are fixed to the center points of the four edges of the top face and the bottom faceof the outer frame body correspondingly to form a triangular area in an enclosed manner. Each triangular area is internally provided with a positioning rod, one ends of the positioning rods are fixedto the corners of the outer frame body, the other ends of the positioning rods are provided with mechanical pressing mechanisms, and rod bodies of the positioning rods are perpendicular to and fixed to the edges of the inner frame body. The vibrating sinking device comprises a crane and a vibrating hammer arranged at the hanging end of the crane. According to the steel casing installation device and installation method at the complex terrains, a casing and the guide frame are arranged, the problem of penetrating through the complex terrains is effectively solved, the control precision of installation of the casing is further enhanced, adverse influences of the geological factor on installation of the casing are overcome, and the steel casing installation device is high in applicability andinstallation precision.
Owner:THE FOURTH ENG CO LTD OF CHINA ZHONGTIEMAJOR BRIDGE ENG GRP +1

Limiting method and device for floating type ship collision prevention floating body

The invention discloses a limiting method and device for a floating type ship collision prevention floating body. The limiting device comprises a floating body and a stop limiting device, wherein the floating body is sleeved on an auxiliary pier, and can move up and down; the upper surface or the lower surface of the floating body is provided with a stop limiting device for limiting the floating body from vertically floating upwards; a one-way limit valve is installed on the floating body; a cavity is formed inside the floating body; and the one-way limit valve is connected to the cavity inside the floating body. Under the effect of the stop limiting valve, the vertical height of the floating body is limited, the floating body is positioned at the highest vertical height permitted by the stop limiting device; if the water level rises continuously, the hydraulic pressure suffered by the surface of the floating body is increased, and when the hydraulic pressure is increased to the pressure set by the one-way limit valve, the one-way limit valve is opened and the water enters into the cavity inside the floating body, the vertical resultant force suffered by the floating body is reduced, and finally the force is balanced at the limit position; and therefore, the defect that a floating-type ship collision prevention floating body brings adverse effects and potential safety hazards to bridges in an extreme water level or a high water level is overcome.
Owner:ZHUZHOU TIMES NEW MATERIALS TECH

Dynamic monitoring method for road quality based on sanitation vehicle

A dynamic monitoring method for the road quality based on a sanitation vehicle comprises the following steps: establishing a road model for a target road, and initializing the road model; performing road quality detection on the target road by using a road quality dynamic monitoring device mounted on the sanitation vehicle; and comparing and analyzing data change according to the detection resultto deduce road quality change information. The device is mounted on the sanitation vehicle, and the characteristics of nighttime operation and periodic operation of the sanitation vehicle are fully utilized, so the restriction of the traffic environment to detection development and the adverse influences of the detection development on the traffic are overcome, and the labor cost is saved; the periodic continuous automatic monitoring of the road is achieved, the shortcoming of long working cycle of traditional inspection work is overcome, the quality status of the road is reflected through thecontinuous change of the internal structure of the road, and the problems of low working efficiency and difficult data analysis brought by traditional artificial analysis and parsing of detection data are solved; and a set of an automatic detection point compensation method and a compensation device is improved to improve the radar detecting and positioning accuracy, so the accuracy and the usability of the detection data are improved.
Owner:CHINA UNIV OF GEOSCIENCES (BEIJING)
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