69results about How to "Control density" patented technology

The invention relates to a method for preparing a pyramid array on a monocrystalline silicon substrate, and belongs to the technical field of manufacture of photovoltaic and semiconductor devices. The method comprises the following steps of: covering microballons in periodic arrangement on the surface of a monocrystalline silicon piece, and annealing near the glass transition temperature point of the microballoon; in oxygen atmosphere, obtaining a microballoon array in separation arrangement after etching by use of inductive coupling plasma; depositing a metallic titanium membrane on the monocrystalline silicon piece uniformly by a physical vapor deposition manner; and putting a silicon wafer with a masking film into an alkaline solution containing a surfactant for corrosion so as to obtain the pyramid array in order arrangement. The method is simple in process, short in preparation period and mature in technology; and three structures such as a positive pyramid array, an inverted pyramid array and a positive and inverted pyramid combined array can be obtained by a method for preparing a template through selecting and fine turning. The method has wide application value in the fields of photovoltaic, magnetic memory devices, nano photoelectric devices, nano sensors, surface raman enhancement and surface plasma effect and the like.

The invention discloses a method for meshing point cloud data. In the method, aiming at discrete point cloud data obtained by laser scanning, an automatic global parameterization method with strong robustness is provided, and a parameterization result is used for directly acquiring a meshing result which is consistent with a main direction and can reflect intrinsic geometric characteristics of a model. The meshing result has two forms, i.e., the meshing result can be wholly formed by quadrangles, or formed by triangles. By using the method, only the point cloud data of the model is used, prior triangulation is not needed to perform point cloud data meshing, the processing procedure is completely automatic, point clouds containing noises can be processed without manual intervention, and the density level of quadrangle meshing can be quickly controlled through parameters to obtain quadrilateral meshes or triangular meshes with various resolution ratios.

In the method, a glass base is provided and the first metal layer is formed on base surface as well as to set up grid electrode and scanning line on it, two layers of grid insulation are deposited in sequence and a semiconductor layer is deposited on the two as well as two blocking layers are deposited in sequence with blocking layer patterns limited, doping semiconductor layer and the second metal layer are deposited on blocking layer and to carry on etching to them, contact hole structure can be formed by depositing two passivation layers in sequence and to etch them, finally a transparent conductive layer is deposited as picture element electrode pattern is limited.

The invention discloses injectable hydrogel and a preparation method and application thereof. The injectable hydrogel is composed of a raw material A, a raw material B and gelling liquid, a mass sum of the raw material A and the raw material B accounts for 5-50% of mass of the hydrogel, the raw material A is butyraldehyde-polyethylene glycol-butyraldehyde, and the raw material B is four-arm-terminated amino modified polyethylene glycol. The injectable hydrogel is obtained by mainly utilizing imide dynamic bonds formed by amino of four-arm-terminated amino modified polyethylene glycol and aldehyde of butyraldehyde-polyethylene glycol-butyraldehyde. The injectable hydrogel can be applied as a drug carrier, an embolization material or a tissue engineering material. The preparation method includes steps: adding the gelling liquid into the raw material A and the raw material B, and well mixing to obtain the injectable hydrogel. The injectable hydrogel has the advantages of simple, convenient and quick preparation process and easiness in large-scale production.

The invention discloses a backing plate under anchorage for a post-tensioning method. The middle of the backing plate under anchorage is provided with a center hole, and an installation fixing hole, a mudjacking hole and an overflow hole are also arranged in the backing plate under anchorage, wherein the distance between the overflow hole and the axis of center hole is less than the radius of a steel strand perforation of a template. By arranging the overflow hole in the backing plate under anchorage, the invention realizes that the vibration compactness of concrete can be judged according to whether concrete grout flows out of the overflow hole after injecting the concrete into a mold cavity at a prestress tensioned hole and vibrating the concrete with a vibrator. If no concrete grout flows out, the result indicates that the concrete is incompact and needs to be further vibrated; and if the concrete grout flows out, the result indicates that the concrete is compact. The backing plate under anchorage is more scientific in structural design, completely avoids the formation of holes behind the backing plate under anchorage, simultaneously prevents the backing plate under anchorage from being broken by pressure in the prestress tensioning process, improves both the quality and the safety of concrete members, and eliminates bubbles on the concrete surface so as to further improve the surface finish after concrete demolding.

The invention relates to the technical field of metal processing, in particular to a manufacturing method for a second cold-rolled tin-plated steel sheet of a highly anti-sulfur food can. The method comprises the steps: enabling a second cold-rolled tin-plated base plate with a thickness of 0.11 to 0.17mm to be subjected to alkali washing, acid pickling, electrolytic tinning, soft melting, passivating, oil spraying and coiling to obtain a finished product; control passivation current density to be 2.5 to 3.5As / dm<2>; adopting sodium dichromate to conduct a passivation reaction, and controlling the concentration of sodium chromate to be 22g / L to 30g / L; controlling the passivation temperature to be 40 to 46 DEG C; and controlling the passivation pH to be 4.1 to 4.7. The manufacturing method for the second cold-rolled tin-plated steel sheet of the highly anti-sulfur food can provided by the invention is able to prepare the second cold-rolled tin-plated steel sheet of the highly anti-sulfur food can, yield strength of the second cold-rolled tin-plated steel sheet is 470 to 600MPa, the elongation is more than or equal to 4%, the hardness HR30T is 68 to 78, the surface roughness is 0.30 to 0.60mu m, and the sulfur resistance is less than or equal to 2 level.

The invention discloses a vibration table-based sample preparation device and a vibration table-based sample preparation method for a large-scale triaxial test of coarse grained soil. An improved table top of a vibration table is adopted, so that a sample base and a protective arm can be fixed and conveniently disassembled and lifted; based on the vibration effect of the vibration table, samples are compacted by vibration layer by layer, so that the grain breakage rate of the coarse grained soil samples can be reduced in the sample preparation process; the heights of all the layers of samples can be monitored in real time by a vernier caliper capable of freely moving along the vertical direction, so that the density of the samples can be better controlled; the prepared samples are placed on a GDS large dynamic triaxial test apparatus by a small-sized crane; after the device and the method are used, low breakage rate, easy control and high accuracy are realized in the large-scale triaxial test process on the whole; the device and the method have great promotion and popularization functions for large-scale triaxial static and dynamic tests related to the coarse grained soil in the future.

The invention discloses a high-assembling-rate steel tube concrete frame structure system and a connecting method, and belongs to the field of fabricated building structures. The high-assembling-ratesteel tube concrete frame structure system comprises a concrete column, a combined beam, a concrete plate, a column-column flange connecting joint, a beam-column connecting joint, a field post-cast concrete and a mounting method thereof. Concrete upper and lower columns are connected together through a column top flange and a column bottom flange by bolts, the column bottom flange is connected with a U-shaped steel plate by bolts, the inside of the U-shaped steel plate is connected with the combined bema by bolts, the concrete plate is mounted at the outwards turned flange of the combined beamand the outwards turned flange of the U-shaped steel plate, and is fixed by anchoring pulling anchor bolts, and finally, the field post-cast concrete is poured finally. The invention mainly solves the problem that an existing concrete frame structure is high in assembling operation amount and low in mounting efficiency.

The invention provides a bifunctional interface lithium ion battery nickel-rich single crystal positive electrode material and a preparation method thereof. According to the method, a certain amount of aluminum source and phosphate are added into a nickel-rich single crystal positive electrode material, and a bifunctional coating layer of AlPO4 and Li3PO4 is formed while surface residual alkali (Li2CO3 / LiOH) is consumed. By controlling the adding amount of the aluminum source and the phosphate and adjusting and controlling the adding mode and the calcining method, the direct contact between the active material and an electrolyte can be reduced, gas production is inhibited, and the thermal stability of the material is improved; and the transmission of ions between the positive electrode and the electrolyte can be accelerated, the stress change in a charging and discharging process is relieved, and the rate capability of the material is improved. According to the method, a bifunctional interface modification layer is obtained, the electrochemical performance of the nickel-rich single crystal positive electrode material is improved through the synergistic effect of the bifunctional interface modification layer; operation is easy and convenient; and raw materials are cheap and easy to obtain. The method is suitable for large-scale commercialization of the nickel-rich single crystal positive electrode material.

The invention discloses a manganese-zinc high-conductivity soft magnetic ferrite material, a preparation method and applications thereof, wherein the soft magnetic ferrite material comprises a main component and a sub-component, the main component comprises Fe2O3, MnO and ZnO, and the sub-component comprises Ca2CO3, Bi2O3, MoO3 and SiO2. According to the present invention, the soft magnetic ferrite material has a Curie temperature of 190 DEG C, a magnetic permeability (10 KHz, 0.1 V) of 9897, and a magnetic permeability (200 KHz, 0.1 V) of 10663; by optimizing the pre-firing temperature and the secondary ball milling process, the grain size and the compactness of the product can be well controlled; and by comprehensively controling the pre-firing temperature, the sintering temperature andthe particle size of the powder, the initial magnetic permeability is improved is increased, such that the product has a high Curie temperature, especially is suitable for working environments with atemperature of below 180 DEG C, and can be widely used in the preparation of vehicle electronic devices.

The invention discloses a vertical type rubbish compression technology in the technical field of environmental sanitation. The vertical type rubbish compression technology sequentially includes a weighing metering step, a collection car unloading step, a rubbish compression step and a filled container loading step, wherein the rubbish compression step includes: firstly, filling a container with rubbish; then, starting a compression hammer to compress the rubbish, compacting the rubbish, and enabling the height of the rubbish in the container to approach one half of the height of the container; then, filling the container with new rubbish, and enabling the height of the rubbish in the container to approach three fourths of the height of the container; next, filling the container with new rubbish, and performing compression for the third time so as to keep the rubbish below the upper edge of the container, and the filled container loading step includes: turning a tipping frame at a dip angle of 70-75 degrees under control of a hydraulic cylinder; then, using a traction steel wire rope to pull the container so as to tilt the container; attaching the container to the tipping frame; controlling the tipping frame to return to the horizontal position. The vertical type rubbish compression technology greatly optimizes the rubbish compression step and the filled container loading step, and greatly improves processing efficiency.

The invention discloses pH sensitive hydrogel as well as a preparation method and an application thereof. The pH sensitive hydrogel is prepared from a raw material A, a raw material B and a gelling solution, the sum of the mass of the raw material A and the mass of the raw material B is 10%-60% of the mass of the hydrogel, wherein the raw material A is aldehyde sodium hyaluronate, the raw material B is polyethylene glycol modified with amino groups at four arms; the pH sensitive hydrogel is mainly obtained through imide dynamic bonds formed by amino groups of polyethylene glycol modified with amino groups at four arms and aldehyde groups of aldehyde sodium hyaluronate or aldehyde glucan. The pH sensitive hydrogel can be used as a drug carrier, an embolization material or a tissue engineering material. The preparation method of the pH sensitive hydrogel comprises the steps as follows: the raw material A, the raw material B and the gelling solution are uniformly mixed to form the pH sensitive hydrogel. The preparation method has the advantages that the preparation process is simple, convenient and quick and mass production is facilitated.

The invention relates to a method for culturing bacterial cellulose through pulsation. According to the method, a hollow oxygen permeating die is placed into a culture container during culturing, the hollow oxygen permeating die is internally filled by air, and the pressure of the air in the hollow oxygen permeating die is periodically changed, so that the hollow oxygen permeating die can be alternatively switched to contract / release in a radial direction. The bacterial cellulose material is prepared in a 'quasi state' way under the condition that the bacterial cellulose is free from layering and is partially adhered. The inner cellulose micelles are relatively obviously orientated in the radial direction and are combined through hydrogen bonds in the molecules and the hydrogen bonds between the molecules; and the material is high in mechanical strength in the radial direction. By adopting the method, the density of the inner structure of the cellulose can be controlled, and a bacterial cellulose tubular material with a dense and smooth inner chamber can be manufactured, wherein the bacterial cellulose tubular material is regular in radial direction and is provided with a differentiation structure. The method is simple in formation process, short in preparation circle of support materials, green and environment-friendly in preparation process, simple, convenient and quick in preparation, and low in preparing cost.

The invention discloses a semi-automatic shipborne throw-sowing device of submerged plants and a throw-sowing workboat. The throw-sowing device includes a shipborne stand, a support mechanism which isfixed on the shipborne stand, a throw-sowing plate which is arranged above the support mechanism and a transmission mechanism, wherein a power source and a motor are fixed on the shipborne stand, therotating shaft of the motor is connected with the transmission mechanism, the two ends of the throw-sowing plate are clamped and fixed on the transmission mechanism separately, and the transmission mechanism is fixed on the support mechanism; and a control box is fixed on the support mechanism, and the control box is electrically connected with the motor and the power source separately. The semi-automatic shipborne throw-sowing device of submerged plants and throw-sowing workboat have no limitation of the water depth and no influences of the size of boats, and have a wide application range; application of labor can be reduced greatly through semi-automatic mechanized throw sowing, and the planting distance, planting density and planting quantities of the submerged plants can be controlledeffectively, so that the throw sowing construction mode of the submerged plants is optimized, and the problem of a low survival rate of the submerged plants is solved fundamentally.

The invention discloses a processing process of blackberry-flavored breakfast biscuits. The processing process includes the following steps: firstly, all raw materials are weighed in parts by weight;secondly, wheat flour, palm oil and bean dreg powder are evenly mixed, pure water and half of blackberry juice are added, concocting is conducted to form a dough, honey is added, then table salt and carbon baking soda are added, stirring is conducted until the dough is even and fine, fermentation is conducted for 2-3 h, and a fermented dough is obtained; thirdly, forming is conducted by a biscuitcompression forming device; and fourthly, baking is conducted. The bean dreg powder replaces part of the wheat flour, thus digestion of the biscuits can be delayed, aging of starch is delayed, and theshelf life of the biscuits is prolonged; the even blackberry taste is obtained by blending the blackberry juice, and the biscuits have the nutrients from blackberries; through the specially-made biscuit compression forming device, the wanted complete biscuit shape can be obtained, and the density degree and the taste of the biscuits can be controlled; and the breakfast biscuits which are rich innutrition, beneficial to intestinal health and long in shelf life are obtained.

The invention discloses a chemical palladium solution applied to a PCB chemical gold palladium clad layer. Main salt, a coordination agent, a reducing agent, a stabilizer, a pH buffering agent and a surface active agent are included. The mass concentration serves as the unit, the components include, by proportion, 0.4-0.6 g / L of the palladium in the main salt according to the concentration, 0.1-30g / L of the coordination agent, 0.1-25 g / L of the reducing agent, 1-150 mg / L of the stabilizer, 1-25 g / l of the pH buffering agent, 0.1-10 mg / L of the surface active agent and the balance pure water.A palladium layer prepared through the palladium solution can meet good welding and bonding requirements, and meanwhile the chemical palladium solution is applicable to surface treatment of a circuitwith the wire width / wire distance being 0.5 mil or below or even smaller.

The invention discloses a large-breadth workpiece three-dimensional data extraction method and system. The method comprises the steps of enabling a workpiece and a scanning system to move relatively,and enabling a laser ray emitted by the scanning system to cover the breadth of the scanned workpiece; acquiring three-dimensional data on a breadth laser ray of the workpiece; calculating the distance between adjacent laser rays according to the relative movement speed of the workpiece and the scanning system and the image acquisition frequency of the scanning system; and splicing the three-dimensional data on all the laser rays according to the calculated distance to obtain the three-dimensional data of the breadth of the workpiece. The system comprises a scanning system, a robot, a high-speed pulse module, a PLC and an upper computer. Accurate splicing of three-dimensional data on the laser rays can be realized by combining the data acquisition speed of the camera and the movement speedof the robot so that the method and the system can adapt to the precision extraction requirements of different types of workpieces in different occasions.

The invention discloses a mesh belt. The mesh belt comprises metal wires and serially connecting rods, wherein the metal wires are unidirectionally wave-shaped; threading holes corresponding to each other in position are formed on the upper parts of the two sides of each wave shape of the metal wire; and circular holes corresponding to each other in position are formed on the lower parts of the two sides of each wave shape of the metal wire. By directly connecting the two ends of the serially connecting rod with the two ends of the metal wire, components for fixing end heads are not extra required, so that the production time and the production cost are saved, and through argon arc welding, a junction is smooth and attractive in appearance.

The invention relates to the technical field of grape planting, in particular to a wineglass type grape landscape planting support and a planting method thereof. According to the wineglass type grapelandscape planting support, the appearance is novel and unique and the ornamental value is high; the light receiving area is large, and the coloring and sensory quality of grapes is improved; fruitingparts are convenient to pick, and the commercial sightseeing value is increased; and the wineglass type grape landscape planting support is suitable for areas which do not perform soil burying for preventing cold and have developed local tourism culture. According to the technical scheme, the wineglass type grape landscape planting support comprises a red wineglass-shaped structure composed of alower main body framework, an upper main body framework and binding iron wire rings; the lower main body framework is a vertical bracket and forms a cup stem of a wineglass; the upper main body framework comprises three groups of brackets formed by connecting vertical parts and arc parts; the bottoms of the three arc parts are intersected and are fixedly connected with the top of the lower main body framework; the three vertical parts are vertically annularly and uniformly distributed in parallel; and the multiple binding iron wire rings are evenly and horizontally arranged on the upper main body framework in a surrounding mode. The wineglass type grape landscape planting support is formed by planting according to a certain planting method.

The invention relates to an aluminum-copper-manganese porous composite material, a preparation method and application thereof. The preparation method of the aluminum-copper-manganese porous compositematerial takes aluminum-copper-manganese alloy powder and nano metal oxide as raw material, and uses 3D printing to obtain the aluminum-copper-manganese porous composite material; and the obtained aluminum-copper-manganese porous composite material has the characteristics of no thermal crack and high strength. The porosity of the aluminum-copper-manganese porous composite material obtained throughthe method is 1%-30%, and the micro hardness of the aluminum-copper-manganese porous composite material is 60-80 HV.

The invention discloses a LiZn ferrite material with low coercive force, which comprises raw materials of Fe2O3, ZnO, Li2CO3, Bi2O3, Mn3O4, Nb2O5, and polyvinyl alcohol, wherein the mole ratio of Fe2O3 to ZnO to Li2CO3 is (45-50):(10-15):(6-8); the mass fractions of Bi2O3, Mn3O4, and Nb2O5 are 1.5-2.2%, 1.5-2%, and 0.15-0.25%, based on the mass sum of Fe2O3, ZnO, and Li2CO3; and the mass fraction of polyvinyl alcohol is 14-17% based on the mass sum of Fe2O3, ZnO, Li2CO3, Bi2O3, Mn3O4, and Nb2O5. The LiZn ferrite material with low coercive force is prepared through the following steps: first ball milling, pre-sintering, second ball milling, pelleting and moulding, and sintering.

The invention discloses a bidirectional press-in type triaxial sample preparation device and method based on soil stress history. The counter-force top plate is located over the base, fixedly connected with the base through a plurality of fixing rods and connected with the base through a plurality of fixing rods, the base and the counter-force top plate are provided with matched base plates, a lower base plate is arranged in the center of the top face of the base, and the top face of the lower base plate is in rigid connection with the bottom face of the lower lifting head. An upper base plate is arranged in the center of the bottom surface of the counter-force top plate, the lower surface of the upper base plate is rigidly connected with the upper lifting head, and a hydraulic system and a sample preparation mold are mounted between the lower base plate and the upper base plate. Uniformity of the soil sample and flatness of the upper surface and the lower surface are guaranteed, compactness of the soil sample is controlled, vertical stress and stress history borne by the soil sample in a foundation are simulated, the problem that three-axis soil sample demolding is prone to failure is solved, and the device is simple in structure, convenient to operate and high in accuracy and success rate.

The invention relates to metal fuel cell materials in the fields of new energy and new materials and to the technical field of processing, in particular to a positive electrode material of a magnesium metal air battery and a continuous coating preparation method thereof. The positive electrode material comprises a current collector, a catalytic layer, a waterproof breathable layer and a sizing material layer, wherein the catalytic layer and the waterproof breathable layer respectively coat two sides of the current collector, and the sizing material layer coats the waterproof breathable layer. The positive electrode material can improve the waterproof effect of the waterproof breathable layer, slow down the permeation of water in the battery electrolyte, ensure that enough gas enters the catalyst layer to participate in the reaction, and effectively prolong positive electrode discharge time.

The invention discloses a wallboard production mould vehicle with an autogenous curing function. The wallboard production moulding vehicle with the autogenous curing function comprises a self-propelled mould vehicle chassis, wherein a fixed sliding groove is formed in the top of the self-propelled mould vehicle chassis, and a thermal insulating mould frame, a thermal insulating partition board anda thermal insulating opening and closing formwork are arranged in the sliding groove; the thermal insulating mould frame, the thermal insulating partition board and the thermal insulating opening andclosing formwork are in sliding fit to the self-propelled mould vehicle chassis; a thermal insulating fixed formwork is arranged at the top of the self-propelled mould vehicle chassis, and opening and closing oil cylinders which are horizontally arranged are symmetrically arranged at both sides of the bottom of the self-propelled mould vehicle chassis; an opening and closing chain is arranged inthe self-propelled mould vehicle chassis, and the opening and closing chain penetrates the self-propelled mould vehicle chassis in a transverse direction; a chain belt of the opening and closing chainis respectively connected with the thermal insulating opening and closing formwork, the thermal insulating partition board and the thermal insulating fixed formwork. The wallboard production mould vehicle with the autogenous curing function provided by the invention has the advantages of saving the investment in curing kilns, saving energy, improving the production efficiency, and reducing the production cost.

The invention discloses silver-nickel alloy powder. The particle size of nickel particles ranges from 0.1 micrometer to 5.0 micrometers, and silver accounts for 0% to 60% of the total weight of silverparticles and the nickel particles. A method for preparing the silver-nickel alloy powder comprises the steps that a reducing agent I is used firstly, the silver particles are primarily separated outon the surfaces of the nickel particles, and therefore a precursor is prepared; and then the precursor is in full contact with a dispersing agent, a complexing agent, the silver particles and a reducing agent II of the silver particles in deionized water, and therefore silver is further replaced and separated out on the surface of the precursor. A silver coating layer on the surfaces of the silver particles and the nickel particles prepared through the method is high in density and has fewer holes, and therefore surface oxidization of the nickel particles and resistance reduction of the silver-nickel alloy powder can be controlled well, it is guaranteed that the conductive performance of the silver-nickel alloy powder after long-time storage is still good, and the silver-nickel alloy powder can be applied to conductive slurry.

The invention discloses a chemical gold plating solution applied to PCB chemical gold-palladium plating. The chemical gold plating solution comprises the following components of, by mass concentration, main salt containing 0.6-1g / L of gold, 1-35g / L of coordination agent, 1-150mg / L of stabilizer, 0.1-10ppm of accelerator and 1-25g / L of pH buffering agent and balance pure water. The method comprises the following steps of adding 50% of water, adding the coordination agent, the stabilizer and the accelerator at one time in the continuous stirring process, adjusting pH value to be within the range of 6.2-6.8, then adding the pH buffering agent, and finally adding gold salt to keep constant volume and form the chemical gold plating solution. According to the gold plating solution, the requirements of a front gold tank and a rear gold tank using the same system of gold plating solution in the gold-palladium process can be met; the gold deposition rate of the gold plating formula is moderate, the gold plating solution is good in stability and can be generally up to more than 10 MTO; and a gold coating with a flat, bright and dense surface and without color difference can be obtained.

The invention discloses experimental equipment for simulating rainfall. The experimental equipment comprises a main body frame, a water tank, a side slope inclined plate, an adjustable flow pump, an adjustable supporting frame, a water flow main pipeline, a rapid series-connection type flow dividing connector, a sliding groove and rain spraying heads. The water tank is arranged at the bottom of the main body frame and is provided with the side slope inclined plate; the inclination of the side slope inclined plate is adjusted by an adjustable support frame below the side slope inclined plate; the top of the main body frame is provided with the rapid series-connection type flow dividing connector and the sliding groove, and a plurality of rain spraying heads are installed in the sliding groove and can freely slide in the sliding groove. The rain spraying head is communicated with the rapid series-connection type flow dividing connector; one end of the water flow main pipeline is connected with the water tank, and the other end is connected with the rapid series-connection type flow dividing connector; the adjustable flow pump is mounted on the water flow main pipeline at the outlet of the water tank; and a flow meter is mounted on the water flow main pipeline. The rainfall intensity, density and uniformity can be adjusted, slope related tests are strengthened, the difference between the slope related tests and the actual rainfall condition is shortened, and the accuracy of the test result is high.

The invention discloses an in-situ WC ceramic-based composite material prepared by selective laser melting and a method thereof. The in-situ WC ceramic-based composite material is prepared by processing and forming W-Ni-C nano composite powder by means of an SLM forming technology. The in-situ WC ceramic-based composite material is a hard alloy-based composite material which takes a WC tissue or aWC tissue and a Ni2W4 tissue as a structural phase and Ni and W as a sticking phase. When the structural phase is the WC tissue, the sticking phase is distributed around the WC tissue; when the structural phase is the WC tissue and the Ni2W4C tissue, the Ni2W4C tissue is located between the WC tissue and the sticking phase. Therefore, the comprehensive mechanical property of the ceramic-based hard alloy can be improved.

The invention relates to a measuring fixture of a frozen soil dielectric constant, comprising a soil sampler, a soil roller and soil retaining components. The soil sampler is in a cylinder shape and provided with an internal cavity; both sides of the soil sampler are provided with openings; the middle part of the soil sampler is provided with external threads; measuring scales are arranged on thesoil sampler; the soil roller is in a cylinder shape and provided with an internal cavity; the middle part of the soil roller is provided with internal threads; the bottom of the soil roller is provided with a soil pressing block; the upper end surface of the soil roller is provided with scales; the soil roller is arranged outside the soil sampler rotatably; and the openings at both sides of the soil sampler are respectively provided with a soil retaining component. In the measuring fixture and the measuring method of the frozen soil dielectric constant, a probe is extended into a thermostated container to perform measurement, and soil samples and the probe are in close contact when the soil samples and the probe are not frozen, therefore, the measuring accuracy is high. Because both the soil sampler and the soil roller are provided with the scales, the volume weight of the measured soil samples can be accurately controlled, and the comparability of data measured for many times can beensured. Because the measuring fixture is adopted to perform measurement, the manual operation can be avoided, the conformity requirement of the measured soil samples on homogeneous isotropy can be ensured, and the measurement error can be reduced.

The invention discloses a chemical palladium plating solution used in the field of wafer packaging and a preparation method thereof. With the mass concentration as the unit, the chemical palladium plating solution comprises tetraammine palladium sulfate with the concentration being 25-30 g / L, a complexing agent with the concentration being 30-60 g / L, malic acid with the concentration being 5-10 g / L, polyamino polyether methylene phosphonic acid with the concentration being 5-15 g / L, saccharin with the concentration being 5-9 g / L, a reducing agent with the concentration being 2-5 g / L, a coordination agent with the concentration being 0.1-10 g / L, a stabilizing agent with the concentration being 0.2-0.4 g / L and a surfactant with the concentration being 0.05-0.2 g / L. The tetraammine palladium sulfate, citric acid, the malic acid, the polyamino polyether methylene phosphonic acid, the saccharin, the coordination agent, the stabilizing agent and the surfactant are mixed according to the proportion, the pH value is adjusted to 6.5-8.5 through a buffering agent, then the palladium plating solution is formed, the temperature is adjusted to 50-60 DEG C, and the palladium plating time is 5-15 min. A plating layer obtained by using the palladium plating solution is compact in structure, and the plating layer is fine and uniform in crystallization.