987results about How to "Clear principle" patented technology

The invention relates to a nanofiber membrane and particularly relates to a novel composite nanofiber membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) dissolving any one of polyvinyl alcohol, polylactic acid and regenerated silk fibroin in an organic solvent to prepare a spinning solution with the mass fraction of 5-20 percent; (2) adding polyphenol substances to the spinning solution, and uniformly stirring to obtain a mixed spinning solution which accounts for 1-7 percent of the total mass of the polyphenol substances and the organic solvent, wherein the polyphenol substances are one or more of vegetable tannin, apple polyphenol and grape polyphenol; (3) carrying out ultrasonic treatment on the mixed spinning solution for 1-600 minutes; and (4) carrying out electrostatic spinning on the mixed spinning solution and collecting to obtain the required composite nanofiber membrane. After subjected to electrostatic spinning, the composite nanofiber membrane is smooth in surface, continuous and uniform, has the diameter of between 100nm and 800nm and can be applied to the fields of medical dressing, makeup facial masks, tea bags, controlled release of targeted drugs, food preservation and sewage purification.

This invention relates to a test method for the safety stable control system of network, which collects voltage of each node and current curve data under various disturbances to be processed by test fault scene data process software to get node data files of networks under various disturbances in a same format, which are input into the test instruments of the corresponding place of the nodes, a GPS calibrates the time and triggers them, disturbance data for selecting test instruments are configured and output to the network safety stable control devices to carry out synchronous dynamic test in different places to them.

The invention relates to an idling slide protective control method of a locomotive. The method comprises the following steps of: detecting the acceleration d omega/dt of a locomotive wheel pair in real time, when the acceleration exceeds a protective threshold, i.e. domega/dt is more than ag, starting to unload a moment, and continuously searching the peak value of the acceleration, i.e. when d<2>omega/dt<2>=0 in the unloading process, searching the peak value; and instantly stopping to unload the moment when the peak value is searched, wherein the change rate of a motor torque dT/dt is 0, the adhesion of a locomotive wheel track recovers again and the change rate of the adhesive force of the locomotive wheel track dF/dt is more than 0. The invention can overcome the over-deepness unloading problem very well in the prior art, the problem cause the locomotive tractive effort loss to be great, affects the adhesion utilization of the locomotive and causes the front and back impacts of the locomotive.

The invention provides a manufacturing method of micron and nanometer metal spherical powder. The manufacturing method comprises the steps of 1 preparing metal powder; 2 preparing evenly mixed powder of the metal powder and carbon material powder or ceramic material powder; 3 performing high-temperature annealing to enable metal to be molten and solidify to form a metal ball, wherein the temperature for the high-temperature annealing is the temperature for metal melting, especially the temperature is higher than metal melting point temperature and ranges from 40 DEG C to 100 DEG C; 4 removing the carbon material powder or the ceramic material powder to obtain the micron and nanometer metal spherical powder. All metals of the metal spherical powder are elemental metals containing gold, silver, copper, aluminum, gallium, tin, zinc, lead, iron, cobalt, nickel, rare earth and the like, and alloy and compounds formed by the elemental metals are alloy and compounds formed by the metals including boron, silicon, carbon, phosphorus, germanium, nitrogen and the like and nonmetal.

The invention relates to a plate type variable friction damper, which is primarily used in the field of wind resistance and shock resistance of structures and equipments. The invention makes use of the variation of the friction factor of a friction surface to provide a linear damping variable friction damping device. The plate-type variable friction damper primarily consists of two cover boards, a sliding panel, a pre-tightening bolt, a disk spring and a packing strip. The friction surface of the cover board is divided into three equal parts; the friction factor between the middle friction surface and the friction surface of the sliding panel is smaller than the friction factors between the friction surfaces of the two parts on both sides and the friction surface of the sliding panel. The plate-type variable friction damper avoids the defects of high cost, being maintained intricately and oil leakiness of the traditional linear damping device, such as the oil damper, and overwhelms the problem that the constant friction damper can not keep the same control under different loads. The invention has simple structure, and is produced easily with low cost. The invention is applicable for both large structures and small structures and equipments, and is suitable to be promoted and used in the field of shock resistance of structures and equipments.

The invention is a method for forecasting and setting friction coefficient in the cold continuous rolling high speed rolling course, executing on computer system the following steps of: a. collecting main equipment parameters of a cold continuous roller specific frame; b. collecting main lubricating process parameters of the cold continuous roller specific frame; c. collecting n groups of actual rolling process parameters of the cold continuous roller specific frame; d. according to the field experimental data of a specific leveler, establishing a plate surface roughness forecasting model for the specific leveler; e. using a, b as friction coefficient mechanism model parameters and to-be-found variants, constructing a friction coefficient mechanism model reflecting basic function relation between friction coefficient and lubricating oil film thickness; f. substituting the friction coefficient mechanism model parameters into a function equation reflecting relation between friction coefficient and lubricating oil film thickness and obtaining a friction coefficient forecasting and setting model in the cold continuous rolling high speed rolling course; and g. on-line forecasting and setting the friction coefficient in the cold continuous rolling high speed rolling course.

The invention relates to an electric power system line weakness evaluation system and method based on multi-attribute analysis. The system comprises an EMS information obtaining module, a line topology importance degree calculation module, a line correlation coefficient calculation module, an economic loss calculation module, a hidden failure rate calculation module, a line integral weakness calculation module and a weak line screening module. The method comprises the following steps of obtaining trend information and historical information of each line in an electric power system; obtaining the topology importance degree index of each line, the correlation coefficient index of each line, the hidden fault rate index of each line and the economic loss index of each line due to line breaking according to the trend information and the historical information of the line; building an integral weakness index function; performing calculation by using the topology importance degree index, the correlation coefficient index, the economic loss index and the hidden fault rate index of the line as input data of the integral weakness index function to obtain the integral weakness index of each line; and obtaining the weak line in the electric power system through setting the critical weakness index.

The invention relates to a test analysis method for lug connecting piece fatigue crack expanding, which is technically characterized by installing a test lug on a testing machine; then loading and producing fatigue crack on the lug; adopting a stress intensity factor comprising a straight lug pulled and loaded lengthwise, the straight lug loaded obliquely smaller than 45 degrees, a symmetrical oblique lug pulled and loaded lengthwise, the symmetrical oblique lug loaded obliquely smaller than 45 degrees, an asymmetrical oblique lug pulled and loaded lengthwise and the asymmetrical oblique lug loaded obliquely smaller than 45 degrees to the corresponding delta K; taking a slope factor of 1g(da / dN)-1g(delta K) line as a constant n in the Paris formula, an intercept of a straight line and axis y as a constant C in the Paris formula, and obtaining the Paris formula when the stress ratio is R; and the lug fatigue crack expanding life NC is estimated according to the obtained Paris formula. The invention has the advantages that the applicability is wide, and the test analytical method plays a directive role in researching the lug hole edge fatigue crack expanding properties under various pulling and loading conditions.

The invention discloses an absolute detection method for a surface shape error of a spherical surface. The absolute detection method comprises the steps of: establishing an equation system about Zernike multinomial coefficients of a measured spherical surface and a reference surface by utilizing measurement data of multiple rotation and concentric translation of the measured spherical surface at a con-focal position and adopting a Zernike multinomial fitting based rotation translation algorithm; and obtaining the Zernike multinomial coefficient by applying a least square method so as to obtain absolute surface shape information of the measured spherical surface and the reference surface. The absolute detection method is also available for the detection of the surface shape error of a plane. As a global optimized idea is adopted to resolve multinomial coefficients of the measured spherical surface and the reference surface at the same time, the absolute detection method for the surface shape error of the spherical surface can suppress system error and random noise for the better, and achieves stronger interference resistance and important application values.

The invention discloses a rapid ellipse detection method based on contour curve segmentation arc merging and combination. The method comprises steps that A, edge contour curves of single pixel width of an image are extracted, and broken line approximation contours are acquired; B, multiple types of constrained conditions are utilized to carry out condition segmentation of the broken line approximation contours; C, neighborhood merging of contour arc segment curves after segmentation is carried out, and adjacent same-type arc segments are merged; D, for L candidate ellipse arc segments after neighborhood merging, non-adjacent same-type arc segments are combined; E, pixel points on each candidate arc segment on L+H ellipse candidate arc segments are utilized to carry out ellipse fitting, authenticity verification is carried out for ellipses after fitting, and FALSE ellipses are eliminated; F, for the real ellipses, the repeated ellipses are eliminated through utilizing distances of the ellipses in a five-dimensional parameter space. Through the method, ellipse detection is carried out, relatively high reliability and robustness are realized, rapid ellipse detection can be realized, and difficulty in extracting ellipse characteristics from images is reduced.

The invention provides a device and a method for online distinguishing parameters of a servo system of a permanent-magnet synchronous motor, wherein the device comprises a parameter distinguishing startup/shutdown unit, a parameter online distinguishing unit, a parameter memorizing unit, a fundamental frequency component extracting unit and a three-phase alternating-current/d-q coordinates converting unit. The method comprises the following steps of extracting the fundamental frequency components of all signals out of the voltage signals measured by the three-phase power supply of the motor and the current signals in a three-phase winding of the motor; processing the fundamental frequency components by the three-phase alternating-current/d-q coordinates converting unit; sending the fundamental frequency components and the electric angular speed signals of the motor to the parameter online distinguishing unit; carrying out the motor parameter distinguishing and outputting the distinguished results by the parameter online distinguishing unit under the control of the parameter distinguishing startup/shutdown unit; and simultaneously memorizing the distinguished results in the parameter memorizing unit. In the invention, the exact motor parameter online distinguishing estimation value can be provided for the high-quality vector controlling; and the disadvantageous influences of the parameters change of the permanent-magnet synchronous motor on the vector controlling during the running can be overcome.

The invention provides a high-frequency-selectivity radio-frequency front end suitable for nano-scale. The front end comprises a high-frequency input matching network, a lower-noise transconductor, a load network and a passive frequency mixer, wherein the passive frequency mixer is arranged on an output node of the input matching network or the low-noise transconductor or the load network; impedance conversion is adopted by the input matching network and the load network to realize high Q values and high frequency selectivity for filtering out-of-band interference; a radio-frequency signal is filtered by using the high-Q-value input matching network, and is then amplified by using the transconductor and the load of the high-Q-value load network which is subjected impedance conversion; a high-frequency signal is converted to a low-frequency signal by performing down-conversion with the passive frequency mixer for processing with an analog or digital baseband. The radio-frequency front end has the advantages of low power consumption, high image rejection ratio, high out-of-band linearity, strong gain configurability, no need of off-chip SAW (Surface Acoustic Wave) filter and the like, and is suitable for application to a future multifunctional integrated radio-frequency chip.

The invention discloses a multifunctional portable bonding anchorage performance detection device which comprises an assembled rotary table, a clamp piece type assembled anchorage device, a displacement sensor, a frame assembly and four through steel threaded rods, wherein the upper ends of the steel threaded rods are connected with the assembled rotary table, and the lower ends of the steel threaded rods are connected with the frame assembly; the clamp piece type assembled anchorage device is arranged between the assembled rotary table and a part to be tested, the lower end of the clamp piece type assembled anchorage device is closely connected with the end of the part to be tested, and the upper end of the clamp piece type assembled anchorage device is closely connected with the assembled rotary table; one end of the displacement sensor is fixed on rib material of the part to be tested, and the other end of the displacement sensor passes through the frame assembly and is contacted with the part to be tested. The multifunctional portable bonding anchorage performance detection device is simple in structure, easy to be assembled and convenient to carry, can be used for detecting the bonding anchorage performance of a reinforcing steel bar (or a complex fiber rib) between monotonic load, repeated load or especially low frequency cyclic load and concrete substrate, and has the detection ways including center tensile compression, eccentric tensile compression, two-end relative tensile compression and the like, thus meeting the demands of scientific research or field test.

The invention provides a semi-driving type variable stiffness dynamic vibration absorber made from conical springs, belonging to the technical field of vibration control. The semi-driving type variable stiffness dynamic vibration absorber comprises two mass blocks, a high-stiffness plate, two small-stiffness plates, two conical springs, a threaded rod, a stepping motor and a real-time monitoring and controlling system. The weights of the two mass blocks are the same, the two mass blocks are respectively arranged at two ends of the upper surface of the high-stiffness plate with a center hole, one large-diameter ends of the conical springs are respectively fixed at the upper surface and the lower surface of the high-stiffness plate, one small-diameter ends of the conical springs are respectively fixed on the two small-stiffness plates, one small-stiffness plate is fixedly arranged in a main structure, the threaded rod penetrates through the circular hole of the high-stiffness plate, two ends of the threaded rod are respectively in threaded connection with the small-stiffness plates, the directions of screw threads are opposite to one another, the top end of the thread rod is connected with an output end of the stepping motor, and the output end of the stepping motor is electrically connected with the real-time monitoring and controlling system. According to the semi-driving type variable stiffness dynamic vibration absorber, the semi-driving type control is easy to realize, the stiffness can be continuously adjusted, the semi-driving type variable stiffness dynamic vibration absorber is good in vibration absorbing effect, large in vibration absorbing range, quick in response, high in precision, and small in energy consumption.

The invention provides a manufacturing method of micrometer and nanometer composite spherical metal powder of a core-shell structure. The manufacturing method comprises the steps that 1, a composite metal powder precursor is prepared; 2, the prepared composite metal powder precursor is evenly mixed with carbon material powder or ceramic material powder; 3, one or more kinds of metal in the composite metal precursor is molten through high-temperature treatment, after solidification, composite metal spheres of a core-shell structure are formed, wherein the temperature of high-temperature treatment at least reaches the melting temperature of one kind of metal in the composite metal precursor, and particularly the temperature is 400-1000 DEG C higher than the melting point of the kind of metal; 4, the carbon material powder or the ceramic material powder are removed, so that the micrometer and nanometer composite spherical metal powder of the core-shell structure is formed. The size of the composite metal powder precursor is smaller than 10 mm, and the optimal size of the composite metal powder precursor ranges from 50 nm to 1 mm. The degree of sphericity of composite metal spheres of the core-shell structure is high, and the composite metal spheres of the core-shell structure can be widely applied to powder metallurgy and conductive slurry.

The invention relates to an axial pre-tightening force sensor. The axial pre-tightening force sensor comprises a regulating gasket 2, a left end cover 3, an elastic sensitive element 4, a strain gage 5, a right end cover 6, a thrust ball bearing 7, an axial hole groove 9, a right bolt 10, a fairlead 11, a package shell 12 and a left bolt 13. The regulating gasket is used for regulating the axial position of the sensor on a shaft, the left end cover and the right end cover support the elastic sensitive element through bosses, the elastic sensitive element generates axial strain because of bearing axial force, and the axial force can be measured through the resistance strain effect and a measuring circuit. The axial hole groove 9 in the right end cover 6 of the sensor is matched with the right bolt 10 to be used for preventing the elastic sensitive element from generating circumferential strain in a pre-tightening process, axial displacement of the right end cover 6 and axial strain of the elastic sensitive element 4 are allowed, and the thrust ball bearing is used for insulating circumferential twisting force generated when the pre-tightening force is exerted so that the axial twisting force can be prevented from being transmitted to the elastic sensitive element 4.

The invention relates to an improved structure of a step-and-track-composite-type movable robot travelling system. According to the improved structure of the step-and-track-composite-type movable robot travelling system, a balance rocker arm hanger bracket of which the two sides are symmetrical is configured on an H-shaped chassis, and a work platform is placed at three fixing points of the balance rocker arm hanger bracket; a driving steering assembly driven by a linear travelling driving motor (54) and a steering travelling driving motor (76) is configured on the balance rocker arm hanger bracket and located on an H-shaped chassis outer bridge shell cross rod, and four supporting legs of the balance rocker arm hanger bracket are configured with joint track assemblies capable of achievingposture adjustment. According to the improved structure of the step-and-track-composite-type movable robot travelling system, the adaptability to a complex annular road surface is very high, and theflexible posture regulation and stable posture keeping capacity is achieved; the attaching profile modeling capacity of uneven complex ground automatic adaption is achieved, and disturbance of the uneven road surface on a vehicle is reduced; the weight loading capacity of the movable work platform is improved, and the stairway-climbing and obstacle crossing capacity is achieved; and through the four-wheel-driving mode, the vehicle cross-country capacity is improved, spot turn can be achieved, and the maneuverability is high.

The invention relates to a preparation method and a device thereof for traversing type lateral composite plates and strips in the field of metallurgy composite materials; the preparation method comprises: preparing materials, forming ingots, cool molding, protection heating, die heat pressing, diffusion annealing, hot-rolling blooming, roughing, finish rolling, cleaning and packing. The device comprises a bottom plate and an upper indenter, wherein, cool press ingots to be pressed are placed between the bottom plate and the upper indenter; horizontal and symmetrical convex teeth are respectively arranged on the bottom plate and the upper indenter; the convex tooth points of the convex teeth are just opposite to the midline of the side of each copperplate in the cool press ingots; the bottom plate and the upper indenter are used for squeezing the cool press ingots to the middle by an oil pressure machine. The preparation method and the device of the invention leads the lateral composite interfaces of two metals in the prepared material to reach the high strength metallurgy combination; the material is high in the whole combination strength and firm in combination and can be used for the large-scale industrial application.