45results about How to "Not easy to achieve" patented technology

The invention discloses a preparation method of a shear thickening gel/three-dimensional woven energy-absorbing material. The preparation method comprises the following steps: step one, weaving high-performance fibers into a fiber woven composite material with a three-dimensional sandwich structure by using a three-dimensional weaving technology; step two, laminating an outer packing material to the side of a three-dimensional sandwich composite material by using an adhesive, and laminating and closing the edge to form a three-dimensional sandwich packing bag; step three, uniformly mixing prepared STF liquid with an obvious shear thickening effect, a high polymer substance and an initiator according to certain proportion, and injecting a mixture into a cavity with the three-dimensional sandwich structure; completely curing, crosslinking and then laminating and closing the outer packing material to the three-dimensional sandwich composite material by using the adhesive to form an STF gel-enhanced three-dimensional sandwich protecting material. The invention also provides the shear thickening gel/three-dimensional woven energy-absorbing material. A protecting texture prepared from the shear thickening gel/three-dimensional woven energy-absorbing material disclosed by the invention has the characteristics of stable performance, high mechanical property, wear resistance and tear resistance.

The invention discloses a method for preparing an aramid fiber surface coating and relates to preparation of polymer coatings (titanium dioxide modified methyl silicone resins) and treatment of aramid fiber surface. The heat resistance and ultraviolet resistance of the aramid fiber are improved. The invention aims to solve the problems that the surface of a conventional aramid fiber is easily corroded, the aramid fiber is easily decomposed at high temperature and a binding effect between the aramid fiber and organic silicon resin is poor. Aramid fiber, acetone, sulfuric acid, butyl titanate and methyl silicone resin serve as raw materials, the aramid fiber is cleaned through the acetone, the surface coating is removed, and acidizing treatment (sulfuric acid) is performed, so that the surface activity is improved. The method comprises the following steps: preparing a titanium dioxide modified methyl silicone resin coating solution, impregnating the activated aramid fiber into the modified methyl silicone resin solution, and preparing the functional aramid fiber of which the surface is heat-resistant and ultraviolet-resistant. The method has the advantages that raw materials are simple, the cost is low, the operating process is convenient, and popularization and application are facilitated.

The invention relates to a 10kV cable online distance measurement method based on sheath current traveling wave time-frequency composite analysis, and belongs to the technical field of force system relay protection. The method comprises the following steps: firstly, extracting three-phase sheath current and Isigma after phase-mode transformation of an extended Clarke matrix as fault distance measurement signals; secondly, performing frequency spectrum transformation on the fault distance measurement signal Isigma through an FFT-MUSIC algorithm, extracting each frequency component in the traveling wave signal, and calculating a fault rough measurement distance x by utilizing a frequency difference method formula; and finally, performing time domain analysis on the signal according to the fault initial position obtained by the frequency domain analysis method in combination with an improved lumped empirical mode decomposition algorithm, accurately judging the arrival time of the secondary reflection wave head of the fault line, and further realizing accurate fault distance measurement by utilizing the time difference among the fault point reflection wave, the opposite end reflectionwave and the initial wave head. The electromagnetic effect of a cable sheath is fully considered, the sheath current is used as the fault characteristic quantity, and the feasibility of online distance measurement is improved.

The invention is a low-sidelobe antenna air strip line sum-difference power division network. The invention mainly aims to solve the problem that the loss of a micro-strip or dielectric strip line power division network is high, and when the number of units is small, the Taylor amplitude distribution edge drops fast and it is not easy to realize an air strip line. The invention belongs to the technical field of radar antenna feeders. The sum-difference power division network is composed of two one-into-five power division networks and two sum-difference devices. The power division networks arein the form of air strip line. An improved Taylor amplitude distribution design is adopted. A power division network unit circuit with impedance transform at the input end is adopted. The method canimprove the loss of the power division network. When the number of units is small, a low-sidelobe antenna can be implemented.

The invention discloses a bamboo rat breeding method which comprises a step (1) of pretreatment; a step (2) of variety selection; a step (3) of rearing stage feeding conditions; a step (4) of breeding stage breeding conditions; and a step (5) of cultivation of young rats. According to the method for improving the reproductive rate of bamboo rats, various nutritious Chinese herbal medicines are added in feed to meet palatability and nutrient needed by the bamboo rats, added young bamboos conform to diet habits of the bamboo rats, pregnant mother rates feed fish meal and kelp, so that the number of laid sucking rats is large, each sucking rat is heavy in weight and good in resistance and does not get sick easily, the sucking rats can be weaned about 10 days ahead of time, and the method is simple to use and easy to implement.

The invention discloses a high-precision radio frequency coaxial connector which relates to the technical field of coaxial connectors and solves the technical problems of improving electrical characteristics and mechanical reliability, reducing processing techniques and reducing processing cost. The connector comprises a support, an outer conductor and an inner conductor, wherein the outer conductor is formed by jointing a left outer conductor and a right outer conductor; the support is arranged in the outer conductor and is located at the joint part of the left outer conductor and the right outer conductor; the inner conductor is inserted in the outer conductor and penetrates through the support; and the support is columnar, both sides of the support are respectively provided with a left inner conductor compensation tank and a right inner conductor compensation tank around the periphery of the inner conductor, a left outer conductor compensation tank is located on the inner wall of the left outer conductor, and a right outer conductor compensation tank is located on the inner wall of the right outer conductor. The connector provided by the invention has excellent electrical characteristics, high mechanical reliability, simple processing technique, low processing cost and high product qualification rate.

The invention discloses a fuzzy C-means clustering method based on optimization of a Sashimi group algorithm, and the method comprises the steps: initializing parameters of the optimization algorithm,and preprocessing a to-be-clustered data set; constructing a target function, namely an evaluation function for a feasible solution; solving the optimal value of the target function to obtain the optimal value and determine the corresponding optimal initial clustering center; and performing fuzzy C-means clustering according to the optimal initial clustering center, and finally obtaining a clustering result. By adopting the method or the system provided by the invention, initial clustering center optimization based on the Saussurea algorithm is carried out on fuzzy C-means clustering, and theproblem that the fuzzy clustering effect is extremely easily influenced by a random initial clustering center is solved.

The invention provides a back structure protecting method. The method is about growing a protective layer on the back side of a wafer to protect the back structure of the wafer. The method comprises the steps of providing a wafer which is provided with a back structure, growing or depositing an oxide layer on the back side of the wafer, depositing a silicon nitride layer on the oxide layer on the back side of the wafer, and conducting subsequent technological fabrication. Compared with the prior art, the method has the advantage that the purpose of protecting the back side of the wafer is realized by growing the protective layer on the back side of the wafer, the silicon nitride layer serves as the outmost protective layer, and the back structure of the wafer is prevented from being affected by other technological processes by means of the fact that impurities are low in diffusivity and not prone to oxidation in silicon nitride. The method is easy to implement and high in control precision, the technology is simple, and the back structure of the wafer can be well protected without affecting the front side.

The invention discloses a near-infrared long-afterglow luminescent material as well as a preparation method and application thereof, and relates to the field of near-infrared luminescent materials. The chemical composition expression of the near-infrared long-afterglow luminescent material is Zn<2-x-y>TiO<4-x>:Cry, wherein x is greater than or equal to -0.6 and less than or equal to 0.6; 0<y<= 0.1. Expensive gallium and germanium elements do not need to be used, and the long-lasting phosphor performance can be achieved. By regulating and controlling the proportion of a zinc-containing compoundin raw materials, the luminescence and afterglow intensity of the near-infrared long-afterglow luminescent material can be obviously enhanced. The near-infrared long-afterglow luminescent material provided by the invention is not easy to absorb moisture, can be stable in air for a long time, has good biological tissue penetrability, and can be widely applied to the field of biological imaging. The preparation method disclosed by the invention includes mixing the raw materials and roasting the mixture to obtain the near-infrared long-afterglow luminescent material, and is simple and easy to implement.

The invention discloses a shear fork type suspension mechanism for a tree barrier clearing flying robot. The shear fork type suspension mechanism comprises a horizontally-arranged I-shaped frame, a telescopic device connected to the lower part of the I-shaped frame in a hung mode, and a lower base connected to the lower end of the telescopic device and in butt joint with a tool system. The I-shaped frame comprises a main beam, guide rods arranged in a bilateral symmetry mode and flange bases at the outer ends of the guide rods; a motor with an output shaft perpendicularly downwards connected with lifting screws are mounted at the middle of the main beam; the telescopic device comprises a pair of shear fork assemblies arranged in parallel in a bilateral symmetry mode, and a sliding rod, a lifting adjusting rod, reinforcing rods and a center reinforcing rod are arranged between the shear fork assemblies; and the sliding rod is connected to the guide rod in a sleeving mode and slides front and back along the guide rods, and threads matched with lifting screws are arranged in the lifting adjusting rod. The lifting adjusting rod is driven to ascend and descend through rotation a the lifting screws, so that a hanging mechanism and a cutter system below the hanging mechanism are driven to ascend and descend, the requirements of different tree barrier cleaning heights can be met, storage and carrying are easy, the tree barrier cleaning efficiency is effectively improved, and the safety risk is reduced.

The invention discloses a pediatric propaganda device based on the internet. The device comprises a propaganda unit, the propaganda unit comprises a square frame, a fixing plate, a main control panel,a display screen, a lamp tube, a PVC plate and a sliding rod, the fixing plate is fixedly arranged in the square frame, and the main control panel is fixedly arranged on the side face, close to the front part of the square frame, of the fixing plate; the display screen is fixedly arranged in the front portion of the square frame, the lamp tube is fixedly arranged in the square frame through a lamp holder, and the lamp tube is located on the side, close to the rear portion of the square frame, of the fixing plate; the PVC plate is fixedly arranged inside the rear part of the square frame, andtwo arc-shaped sliding grooves are symmetrically formed in portions, close to the rear portion of the square frame, of the top wall and the bottom wall of the square frame. According to the device, knowledge of the pediatric department is propagandized through organic combination of the internet and traditional posters so that the propagandized pediatric knowledge can be updated in real time, thepropaganda effect is good, the device is suitable for daytime and night and convenient to use, a new energy source can be fully utilized, and sun-shading and rain-sheltering functions can be achievedfor people.

The invention discloses a method for delaying frosting on the surface of an absorption unit heat exchanger. A defrosting coiled pipe is additionally arranged in the finned heat exchanger, and a concentrated solution is introduced into the defrosting coiled pipe. According to the method, the concentrated solution is introduced into the defrosting coiled pipe, so that the temperature of the outer surface of the defrosting coiled pipe is higher than the temperature of a heat exchange coiled pipe on the inner side, so that the distance of the air contacting a refrigerant heat exchanger is increased, and the temperature of heat exchanger aluminum foil is increased; the aluminum foil is used as first reduction aluminum foil, the static pressure is increased, the dew point temperature is increased, and the surface temperature of the aluminum foil is still higher than the dew point temperature; therefore, the surface of the absorption type unit heat exchanger is not prone to frosting, and thefrosting is delayed; and the freezing point of the concentrated solution is far lower than the environment temperature, and the phenomenon that the concentrated solution is frozen in the defrosting coiled tube is delayed.

The present invention relate to the field of surgical instruments, and discloses a straight-through suction washer, comprising a suction washer main body, a first pipe, a second pipe and a third pipearranged side by side and communicated with the first pipe respectively, wherein, when the second pipe is in a conductive state, the first pipe and the second pipe form a suction flow passage; the second pipe and the third pipe are respectively controlled to be on and off by an independent switch; when the third conduit is in the conductive state, the first conduit and the third conduit form a flushing flow passage. By changing the internal pipe of the suction washer into a straight-through structure, the improved straight-through suction washer is not easy to be blocked, is convenient to clean and use, is simple in structure, and is easy to realize.

The invention provides a method for screening monoclonal antibody pairs free of complement interference. The method comprises the following steps: S10, obtaining a negative sample mixture; s20, adding an antigen into the negative sample mixture to obtain a detection sample I; s30, heating the negative sample mixture, and adding an antigen to obtain a detection sample II; s40, adding complement into the detection sample II to obtain a detection sample III; s50, respectively performing immunochemiluminescence detection on the detection sample I, the detection sample II and the detection sample III by using a chemiluminescence reagent prepared from a monoclonal antibody pair to be selected to obtain a detection result I, a detection result II and a detection result III; s60, according to the first detection result, the second detection result and the third detection result, the monoclonal antibody pair free of complement interference is obtained. The technical problem that immunodiagnosis is often interfered by complements and the accuracy of immunodetection is influenced is solved, and the technical effects that the immunodiagnosis is not easily interfered by the complements and the accuracy of the immunodiagnosis is improved are achieved.

The invention discloses a platform assembly. The platform assembly comprises a platform body, wherein the platform body comprises two oppositely-arranged frame bodies, and the front ends and the rearends of the two frame bodies are connected through cross beams separately to encircle a quasi-quadrilateral frame; reinforcing beams are arranged between the frame bodies and the cross beams, a plurality of support beams arranged in parallel are distributed in the frame, the two ends of each support beam are connected with the two frame bodies separately, and the support beams are parallel to thecross beams; and two supports are arranged on the platform body, installation plates are fixed to the bottoms of the two supports separately, and the two supports are fixed to the two frame bodies through the installation plates separately. The platform assembly is high in structural strength, not liable to be deformed, simple in machining steps, and easy to realize; and the first support beam, the second support beam, the third support beam and the fourth support beam are capable of providing great structural strength, so that the platform body is not liable to be deformed, and the structuralstability when the frog leg supports are assembled on a frog leg seat for use is ensured.