342results about How to "Moderate density" patented technology

The invention discloses an easily-soluble magnesium alloy material which comprises the following elements such as Al, Li, Ca, Zn, In, Ga, Si, Zr, and the like. The invention further discloses a preparation method of the easily-soluble magnesium alloy material. The easily-soluble magnesium alloy material is used for producing products such as a ball sealer, a target, and the like, has technical characteristic of being easy to dissolve or quick to degrade, and can be designed into an oil exploitation underground component or an underground component which is used for performing a temporary function or is temporarily needed. Compared with the prior art, the easily-soluble magnesium alloy material has the advantages as follows: a high operation cost problem for secondary drilling or milling is solved or avoided, and technical and economic effects with low cost and high efficiency are obtained. Meanwhile, the magnesium alloy density is proper, molten slag or corrosion products of the magnesium alloy satisfy flow-back operation technical requirements, and technical effects with multiple advantages of being simple, efficient, environment-friendly, energy-saving, and the like, can be obtained.

The invention discloses a rapidly degradable magnesium alloy material. The material comprises the following components: elements such as Al, Li, Ca, Y, Si, Ni, Cu and Fe. The invention also discloses a preparation method and the application of the rapidly degradable magnesium alloy material. Compared with the prior art, the rapidly degradable magnesium alloy material has the advantages that the problems of failure in resisting high temperatures and failure in meeting high-temperature and high-bearing operation requirements of the existing easily degradable materials or easily degradable magnesium alloy materials and products thereof are solved, meanwhile, the material is controllable in density, the slag or the corrosion product of the material meets the requirements of flowback operations, and multiple technical effects of simplicity and high efficiency, low cost, energy conservation, environmental protection and the like can be achieved.

The invention discloses nano biological filler for purifying aquaculture wastewater in a biological filter tank and a preparation method of the nano biological filler. The biological filler comprises an EM rejuvenation solution and an adsorption carrier of the EM rejuvenation solution, wherein the EM rejuvenation solution is a product obtained by performing mixed fermentation on an EM stock solution, molasses and deionized water; the adsorption carrier is obtained by performing mixed pressing on composite nano powder, kaolin powder and modified bentonite; the composite nano powder is a product obtained by performing mixing and high-temperature sintering on nano-level aluminum oxide, titanium dioxide and silicon dioxide; modified bentonite is prepared from sodium diethyldithiocarbamate modified original soil. The preparation method comprises the following steps: pressing adsorption carrier particles; fermenting to obtain the EM rejuvenation solution; dipping the EM rejuvenation solution by using the adsorption carrier to obtain the nano biological filler. The obtained nano biological filler is high in pore volume, high in cell adsorption capacity, large in specific surface area and strong in stability, has a good treatment effect on aquaculture sewage, and can be used for rapidly removing ammonia nitrogen, phosphorus and heavy metal ions in an aquaculture water body.

A novel high-silicon aluminum alloy electronic packaging material and a preparation method thereof. The alloy of the present invention consists of the following ingredients, in percentage by mass: 12-40% of Si, 0.3-0.6% of Fe, 0.3-0.45% of Mn, 0.3 to 0.5% of Mg, and the balance being industrial pure aluminum. Spray deposition is used to prepare ingots; and then a plurality times of small deformation thermal densification are carried out for the ingots after annealing for elimination of thermal stress, to prevent cracking of the alloy during processing, thereby enhancing the density of the material. The alloy of the present invention has the characteristics of high strength, low coefficient of expansion, high thermal conductivity and good air tightness.

The invention relates to a multi-hole foam glass carrier for a fast mass transfer biological fluidized bed and a preparation method and application thereof, which belong to sewage disposal technology. The multi-hole foam glass carrier is prepared by using waste glass as a raw material to be composited with volcanic rocks, coal ash, coal gangue, furnace clinker, iron powder, aluminum powder, binding agents, foaming agents, foam stabilizer and fluxing agents by weight, and multi-hole foam glass is obtained by stages of preheating, fast sintering, foaming, fast cooling and annealing. The preparation process of the multi-hole foam glass carrier is simple in route, easy to control and low in cost, and the prepared carrier is stable in performance, high in porosity, large in specific surface area, resisting in impact, good in mechanical performance, high in biocompatibility, favorable to efficient fixing of the microorganism, and suitable to the fast mass transfer biological fluidized bed. The multi-hole foam glass carrier solves the problem that biological immobilization carriers in the prior art are easy to abrade, small in bio-film formation amount, low in mass transfer effects and the like in the fast mass transfer biological fluidized bed. The preparation method opens up new approaches for preparing the biological carriers, and fills blank spaces in using of foam glass materials in sewage disposal.

The invention relates to a car door-window straight-line part gland strip and a preparation method, which iare used for solving the problem that the compression permanent deformation rate of the present car door-window straight-line part gland strip is high, and adopts the technical scheme that: the gland strip is prepared by the following substances in part by weight: 22 to 27 ethylene propylenediene rubber 9090M, 6 to 10 ethylene propylene diene rubber 3072EM, 1 to 3 active zinc oxide, 0.4 to 0.8 stearic acid, 0.4 to 1.0 dispersant L-24, 0.7 to 1.1 polyethyleneglycol, 25 to 30 general purpose furnace black (GPF)-grade carbon black N650, 10 to 14 heavy calcium carbonate, 16 to 20 paraffin oil, 1 to 3 calcium oxide, 1.3 to 1.7 accelerator, 0.05 to 0.08 antiscorching agent, 0.2 to 0.6 sulfur and 0.8 to 1.2 p,p'-Oxybis(benzenesulfonyl hydrazide) N8000W. The car door-window straight-line part gland strip has good elasticity, good aging resistance, excellent ozone property, good low-temperature application property and appropriate apparent density.

The invention discloses a high-strength silicon carbide ceramic pipe and manufacturing method thereof, and belongs to the technical field of engineering ceramic materials. Silicon carbide ceramic powders with different granularities are used as the main raw materials, graphite powder and carbon black are used as binders, and resin is used as a binder. The materials are uniformly mixed by a spray granulation process; an organic plasticizer of cellulose and a lubrication agent are added into the mixture; and vacuum pugging, decaying and extrusion molding are conducted to obtain a pipe base substrate; and the base substrate is subjected to drying solidification, high temperature sintering reaction, sandblast and heat treatment to obtain the high strength silicon carbide ceramic pipe. The pipe biscuit manufactured by the process has high strength and length of more than 4000mm; after sintering, the pipe has strength of 300MPa or more, and has the advantages of moderate density, high thermal conductivity, high fracture toughness, good thermal shock resistance and low cost, and can be widely applied to chemical and metallurgy fields, such as acid and alkaline corrosion and high temperature erosion.

The present invention is one kind of green compounded and puffed feed for rock fish. The green compounded and puffed feed is prepared with steamed fish meal 35-50%, soybean residue 15-20%, pork bone powder 5-12%, beer yeast 3-5%, cuttle fish paste 2-6%, fish oil 1.0-2%, vegetable oil 1-2%, macaroni flour 10-20%, shrimp shell powder 3-6%, lecithin 1-2%, vitamins 0.3-0.5%, compounded mineral 0.5-1% and choline chloride 0.3-0.5%, and through mixing, crushing, extruding to pelletize, and stoving. The green compounded and puffed feed has simple compounding process and balanced nutrients, can meet the requirement of the growth of rock fish, and results in less water contamination.

The invention discloses a water-based nano reflection and heat insulation transparent coating and a preparation method thereof. The formula of the coating comprises the followings in percentages by weight: 35%-50% of a water-based acrylic emulsion, 5%-15% of water-based lithium silicate, 5%-15% of a water-based polyurethane emulsion, 5%-10% of a water-based heat insulation nano dispersion sizing agent, 5%-10% of a water-based heat insulation and heat preservation nano dispersion, 2%-12% of a wetting dispersant, 0.2%-0.5% of a flatting agent, 0.2%-1% of a thickener, 0.1%-0.2% of an antifungus and anti-mildew agent, 0.5%-2.5% of a coalescing agent, 0.5%-2% of a silane coupling agent and 5%-25% of deionized water. According to the water-based nano reflection and heat insulation transparent coating disclosed by the invention, under the precondition of without influencing lighting, heat radiation is blocked and infrared heat energy is prevented from being conducted into the interior of a base material through effective reflection and heat energy conduction, and thus the effects of heat insulation and heat preservation are reached. Heat energy, entering the room through the base material, generated by an outdoor heat source can be effectively blocked in summer, and indoor heat can be effectively blocked from being dispersed in winter, so that the application of refrigeration and heat preservation equipment can be effectively reduced, and the energy-saving effect is obvious.

Disclosed is a wood bunch composite lumber, whose cross section is square, round or elliptical shaped, wherein the wood fiber is vertically arranged; the appearance of the cross section is a congregated section of numerous wood bunches, showing the combining color of the natural wood color and the color of the glue; the density is 0.7-1.1g / cm3; the static bending strength is 30-40MPa; the elasticity modulus is 5000 -11000MPa; the nail-holding ability is 1100-2000N. The production of the composite lumber includes the following procedures: material selection, wood-bunch preparation, desiccantion, gluing, measuring, assembling, mould packing, cold pressing, thermal initiated solidification, cooling and mould removal. The composite lumber can be applied directly to the architectural ornament industry, the sawed floor board and the furniture faceplate and so on. The invention has advantages that the raw materials adopted can make comprehensive use of the lumber resources; the material quality of the product is even; the structure and the nature of the lumber can basically be kept unchanged; the lumber is material-saving, stable and easy for secondary production.

The invention relates to a formula of compound puffed feed for Leiocassis longirostris and process for preparation, wherein the constituents in the formula comprise (by mass ratio): soybean 20-50%, cotton seed waste 0-15%, groundnut meal 10-15%, fish meal 2-4%, meat and bones meal 0-15%, blood powder 0-5%, wheat flour 8-15%, maize 12-20%, fish oil 1-2%, calcium dihydrogenphoshate 0.5-1%, premixed material 1-2%. The preparing process consists of proportioning the constituents, mixing with disintegrated soybean cake raw material and maize homogeneously, disintegrating, modulating, palletizing and drying.

A method of adjusting a power density in a laser device including a VCSEL array providing an increased power density at a high wall-plug efficiency in that the lateral design parameters are appropriately selected on the basis of a relationship that has been established for a specified vertical design, a corresponding process technology and specified operating conditions. Thus, the total output power, the power density, and the efficiency may be optimized independently from other design criteria and application requirements by tuning only the lateral size of the individual VCSEL elements and the pitch of nearest neighbors of the elements within the array. Hence, for a lateral size of less than 30 μm and a pitch of less than 80 μm, a highly efficient VCSEL array can be provided with a high power density, thereby optimizing manufacturing costs for the output power per chip area.

The invention relates to a process for manufacturing dumbbell and barbell products. A material obtained by mixing iron powder and a binding agent is pressed into the shapes of barbell products, or the material obtained by mixing the iron powder and the binding agent is filled into a mould cavity produced according to the shapes of the barbell products, the expected shapes, dimensions and weights are achieved, and sizing, demoulding and air drying are carried out, thus specific products are obtained. The process is simple and easy to operate, the product cost is moderate, the density is moderate, and the produced products can substitute dumbbells, dumbbell discs, barbells, barbell discs, kettle bells or counter weight rods made by a mixture of cast iron and cement.

The invention discloses a water glass transparent reflecting heat-insulation coating material and a preparation method thereof, wherein the water glass transparent reflecting heat-insulation coating material comprises, by mass, 35-50% of an aqueous acrylic emulsion, 5-15% of an aqueous silica sol, 5-15% of an aqueous polyurethane, 5-10% of an aqueous nanometer antimony tin oxide heat-insulation slurry, 5-10% of an aqueous nanometer lanthanum hexaboride heat-insulation slurry, 5-10% of an aqueous nanometer vanadium dioxide heat-insulation slurry, 0.1-0.5% of an anti-foaming agent, 0.1-0.3% of a wetting dispersing agent, 0.2-0.5% of a leveling agent, 0.2-1% of a thickening agent, 0.1-0.2% of an anti-mildew antibacterial agent, 0.5-2.5% of a film forming auxiliary agent, 0.5-2% of a silane coupling agent, and 5-25% of deionized water.

The invention discloses a method for preparing isocyanate terminated polyether / phenolic resin foamed plastic and belongs to the field of foam heat insulating materials. The method comprises the following steps of: adding a surfactant and a foaming agent into special expandable phenolic resin to form a component A; and uniformly mixing and stirring the component A and an isocyanate terminated polyether pre-polymer serving as a component B; pouring the mixture into a mold; and foaming and curing the mixture at normal temperature, wherein the mass ratio of -NCO contained in the isocyanate terminated polyether pre-polymer to the expandable phenolic resin is 0.1-0.6:1; the foaming agent is a physical foaming agent of which the boiling point is low; the -NCO group content of the isocyanate terminated polyether pre-polymer is between 18.5 and 19.5 mass percent; and the viscosity of the isocyanate terminated polyether pre-polymer is between 0.15 and 0.65 Pa.S at the temperature of 25 DEG C. The speed of the reaction of the phenolic resin and an isocyanate group is stable and foam density is appropriate (between 56 and 109 kg / m<3>) and can be adjusted through the using amount of the foaming agent.

The invention discloses a building structure adhesive suitable for underwater construction. The component A comprises the following raw materials in parts by weight: 60-80 parts of epoxy resin, 5-10 parts of active diluent, 5-10 parts of toughening agent, 1-2 parts of coupling agent, 50-200 parts of filler, 1-4 parts of thixotropic agent and 1-4 parts of wetting dispersant. The second component Bcomprises the following raw materials in parts by weight: 100 parts of phenolic amine curing agent, 50-200 parts of active filler, 1-4 parts of thixotropic agent and 1-4 parts of wetting dispersant. The raw materials used in the building structure adhesive suitable for underwater construction are all highly hydrophobic raw materials, The structure adhesive has good underwater construction performance, can be insoluble, not float and not shrink in underwater construction, can be easily adhered and coated, leveled and adhered on the bonding surface, and can be applied to the bonding of underwater environment building structure. Its underwater bonding strength is high, and its mechanical properties and moisture-heat aging properties conform to the national standard GB50367-2013, GB50550-2010,GB50728-2011 requirements.

The invention provides a method for building and managing a famous tea mechanical plucking tea garden, and belongs to the technical field of plant cultivation. The method is characterized by mainly comprising the steps of tea garden selecting, tea plant variety selecting, planting, tree crown cultivating and pruning, mechanical plucking period and remaining, maintaining of plucked tea tree crowns and the like, wherein frames of tea trees of the built tea garden are clear in layer, ventilative and transparent, growing branches are thick and uniform in distribution, the tree crowns are small in surface, stumps are uniform in thickness, and the density reaches about 1000 / m<2>; young sprouts of each tea tree grow on a regular and smooth tree crown surface, bud leaves are distributed uniformly, the density is proper and can reach about 2000 / m<2>, timely plucking is conducted, the raw material yield of famous tea can reach 70%-75%, and the plucking effect is good.

A preparation method of a C / C-SiC-MoSi2 ceramic-based composite material includes the following steps: 1) dispersing silicon carbide powder and molybdenum disilicide powder in isopropyl alcohol, and performing ultrasound vibration and stirring to obtain a suspension liquid A and a suspension liquid B: 2) increasing the density of a low-density carbon fiber stereo fabric in a manner of hydrothermal permeation of glucose, and placing the fabric in a suction filtration device having a glass sand core; 3) pouring the suspension liquid A and the suspension liquid B successively into a suction filtration flat-bottom funnel to enable the suspension liquids to pass the C / C composite material completely; 4) performing a homogeneous phase hydrothermal reaction until the density is 1.2-1.5 g / cm<3>; and 5) performing thermal treatment to obtain the C / C-SiC-MoSi2 ceramic-based composite material. The composite material is moderated in density, is compact in structure, and is excellent in interface binding between a C / C interface and a SiC interface, the SiC interface and a MoSi2 interface and the C / C interface and the MoSi2 interface. The raw materials are easy to obtain. The preparation method is simple in operation, is low in cost, is environment-friendly and is pollution-free.

The invention relates to a method for preparing electrophoretic particles by using an organic pigment. Specifically, the invention discloses the method for preparing electrophoretic display particles. The electrophoretic display particles comprise core particles and modifying layers covering on the surfaces of the core particles. The method comprises the following steps: suspending the core particles in a first solvent and adding an alkali into the first solvent to perform alkalization so as to form a first suspension; suspending tetraethyl orthosilicate in a second solvent to form a second suspension; adding the second suspension into the first suspension, and further stirring at the increased temperature to perform the reaction; adding a silane coupling agent containing an amino group into a mixture in the step (3), stirring to perform the reaction and further obtaining pre-modified particles connected with the silane coupling agent; dispersing the obtained pre-modified particles in a third solvent, adding polymer monomers, and uniformly mixing; and adding an initiator to perform polymerization reaction to enable the polymer monomers to be polymerized on the surfaces of the pre-modified particles to form the surface modifying layers, and further obtaining the electrophoretic display particles. The electrophoretic particles obtained by the method disclosed by the invention have the significant improved apparent performance.

The invention discloses a raw material mixing ratio and preparation method of red mud ceramsite. The red mud ceramsite is prepared from the following raw materials by weight percent: 15 to 75 percentof red mud, 10 to 65 percent of building waste or sludge or bauxite or coal ash or coal gangue or clay or binder, 1 to 20 percent of water, 5 to 35 percent of crushed glass or SiO2, 5 to 25 percent ofcement and 10 to 45 percent of foaming agent or gas forming agent or expansion agent or other additives (comprising bentonite, NaNO3 powder, starch and metal powder such as aluminum, zinc, calcium carbide, magnesium and the like). The binder, the gas forming agent and the foaming agent comprise all types available in the market at present. The production process comprises the steps of treating raw materials, pelletizing, granulating, layering screening, baking by a temperature box, calcining raw ceramsite, and cooling. The ceramsite prepared in the invention meets the national and relevant industrial safety requirements and indexes and has excellent acoustic performance and is high in high temperature resistance, high pressure resistance and strength. In addition, a great amount of solidwaste is adopted, so that the environmental protection significance is outstanding. Production equipment utilizes bio-fuel, thereby saving the energy compared with a conventional calcining productionmethod.

The invention discloses a gold micron feather cluster modified with silver nanoparticles and a preparation method and application thereof. The gold micron feather cluster is characterized in that the silver nanoparticles are coated on an aluminum sheet, of which the surface is provided with pit arrays, wherein the particle diameter of the silver nanoparticles is 15-25 nm, and the gold micron feather cluster has the diameter of 32-658 microns and consists of gold micron feathers which consist of gold nanoparticles with the particle diameter of 200 nm to 1 micron and have the feather rod length of 16-329 microns, the feather branch length of 8-160 microns and the small feather branch length of 2-13 microns. The method comprises the following steps of: firstly obtaining the aluminum sheet, of which the surface is provided with the pit arrays which are hexagonally arranged in an orderly manner and are bowl-shaped, by using an anodic oxidation method; carrying out gold nanoparticle ion sputtering on the aluminum sheet so as to obtain the aluminum sheet coated with the gold nanoparticles; then putting the aluminum sheet coated with the gold nanoparticles in an argon atmosphere, and annealing so as to obtain the aluminum sheet coated with the gold micron feather cluster; and carrying out silver nanoparticle ion sputtering on the aluminum sheet coated with the gold micron feather cluster, thereby producing a target product. The gold micron feather cluster modified with the silver nanoparticles can serve as a surface-enhanced Raman scattering active substrate, and the content of rhodamine or tetrachlorobiphenyl attached onto the gold micron feather cluster is measured by using a laser Raman spectrometer.

The invention discloses a clay brick regenerative aggregate concrete partition lath. The partition lath is manufactured by the following components by volume percentage: 60 to 70 percent of clay brick regenerative aggregate, 20 to 25 percent of cement, 0 to 5 percent of building sand, 0 to 15 percent of coal ash, 0 to 5 percent of expanded perlite, 0 to 5 percent of new or waste polyphenyl granules, 0 to 2 percent of fibers, 1 to 3 percent of cement modified polymer emulsion, and 2 percent of additive. The invention also discloses a method for manufacturing the clay brick regenerative aggregate concrete partition lath. The clay brick regenerative aggregate concrete partition lath has proper density, excellent performances on strength, shrinkage value, sound insulation and the like, is favorable for controlling crack on wall surfaces, has manpower tolerable range on installation construction of the lath, and realizes high added value utilization of building waste.

The invention discloses a preparation method for forming open-cell phenolic resin based carbon foam by a one-step method. Key points of the method comprise the following steps: a thermoplastic phenolic resin, hexamethylenetetramine and a foaming agent are mixed evenly under normal temperature, then are carefully loaded into a mould made of a carbon electrode material, and are subjected to cold compression premolding under certain pressure, and then the mould is well fixed by a fixture. Under normal pressure, the mold which is well fixed and is loaded with a sample is placed into a carbonization furnace and is increased to be 800 DEG C according to certain temperature program to be foamed, solidified and carbonized to obtain the open-cell phenolic resin based carbon foam.

An OSB ecological painting-free decorative surface furniture plate comprises at least one OSB blank plate; a decorative surface layer is composited on at least one surface of the OSB blank plate by at least one buffer balance layer in the middle; the preparing method comprises the following steps of a, manufacturing the OSB blank plate: machining a raw material into a thin long wood chip which is 40-120mm long, 5-20mm wide and 0.3-0.7mm thick along the grain direction, paving a three-layer or four-layer criss-cross structure by gluing, and manufacturing the blank plate by adopting a continuous hot press process; b, compositing by adopting a direct attaching mode: compositing the OSB blank plate and a veneer which is 0.1-3.0mm thick to manufacture an OSB base pate by using E0 glue, then attaching one layer of impregnated paper decorative surface layer on the surface of the OSB base plate; or the step b, compositing by using a repeated attaching mode: compositing the veneer which is 0.1-3.0mm thick and the impregnated paper to manufacture a paper board composite decorative surface layer, and gluing the paper board composite decorative surface layer to the OSB base plate by E0 glue. The furniture plate has a painting-free function, and has the excellent performances of environment friendliness, high stability, high carrying property, high nail keeping capacity and the like.

The invention discloses an efficient sweet cherry fence type grafting and symbiotic cultivation technology. According to the technical scheme, fence type cultivation is utilized. The method comprisesthe steps of large seedling cultivation and transplanting before grafting, trunk grafting and cultivation of lateral branches after grafting. According to structural indexes of trees obtained after symbiotic cultivation, the height of the trees is 2.5-3.0 m, the vertical section of each trunk is 40-50 cm high, the horizontal section of each trunk is 1.8-2.3 m long, 8-12 back branches grow on eachtrunk, the back branch spacing of each trunk is 10-15 cm, the length of the back branches on each trunk is smaller than 2.0 m, the diameter of base parts of the back branches on each trunk is smallerthan 4 cm, and the effect fruit and branch proportion is 98%. The invention further discloses application of the technology in the field of cherry grafting and cultivation field. The problem that in atraditional fence type cultivation technology, back branches of cherries are not balanced in growth is solved, seedling planting is completed within two years, and the technology has the advantages that the number of layers of tree structures is small, growth is balanced, the back branches are strong, the yield is high, harvesting is early, the cherry variety is good, and mechanical harvesting isfacilitated.

The invention discloses lightweight concrete with electromagnetic shielding functions. Raw materials of the lightweight concrete comprise Portland cement, carbon fiber, waste polypropylene particle, iron powder, river sand, water, and an additive. The lightweight concrete possesses excellent electromagnetic shielding effects, and electromagnetic shielding effect on 500MHz electromagnetic signals is as high as 50dB; the lightweight concrete also possesses excellent mechanical properties, corrosion resistance, and mould resistance; and application prospect is promising.

The invention belongs to the field of agricultural machinery, and in particular relates to an indented precise seed metering device specially used for sowing wheat. The seed metering device comprises a seed metering box and a seed metering wheel arranged in the seed metering box, wherein the seed metering box comprises a seed protecting board which encircles the circumferential wall of the outer side of the seed metering wheel; a plurality of indented circles are evenly distributed on the circumferential wall of the outer side of the seed metering wheel along the axial direction, and a plurality of indented holes are evenly formed in each indented circle along the circumferential direction; a seed inlet hole and a seed outlet hole are respectively formed in the top and the bottom of the seed protecting board along the axial direction; the seed inlet hole is provided with seed guide spacer plates between the adjacent indented circles, and the seed guide spacer plates are used for guiding seeds to enter the indented holes according to a preset direction; the seed metering box also comprises a rectangular frame, two side plates and two baffle plates, and the seed metering wheel and the seed protecting board are arranged between the two side plates in a clamping way; a seed clearing brush is arranged on the baffle plate which is in face of the rotating direction of the seed metering wheel. The indented precise seed metering device can realize precise sowing of wheat, and avoids the phenomenon that wheat grains are arranged side by side, overlapped or crowded.

The invention provides a light reinforced composite floating plate for preventing the water level from evaporating. The light reinforced composite floating plate for preventing the water level from evaporating comprises the following steps of: clipping a bidirectional plastic geogrid of 25-50KN into meshes with equal size, and adding benzene particles into cement mud, wherein the volume of benzene particles per cubic is 0.845-0.850m<3>; prefabricating method: pouring benzene particle mixed materials into a mold, filling to 1-2cm, compacting, then laying geogrid meshes at the lower layer, adding benzene particle mixed materials, filling to 5-9cm, compacting, laying geogrid meshes at the upper layer, then adding benzene particle mixed materials to 1-2cm, and compacting, thereby obtaining a mixed condensed plate, then demolding, brushing mud, bonding carbon fiber cloth, wrapping, and sealing, thereby preparing a stormy-wave-resistant, collision-resistant, seepage-resistant, ultraviolet-resistant, antifreezing and water-erosion-resistant performance light reinforced composite floating plate. When the plate is used, the plate is laid freely according the water area, and is not required to be connected and fixed.

The invention relates to a two-dimensional transition metal chalcogenide crystal, and a preparation method and application thereof. The preparation method includes the following steps: (1) sequentially putting a chalcogen source and a transition metal oxide source along an airflow direction in a heating device, wherein the transition metal oxide source is coated with a molecular sieve, and a growth substrate is put on the upper side of the transition metal oxide source; (2) injecting a protective gas into the heating device, increasing the temperature until the temperature of the transition metal oxide source reaches a chemical vapor deposition temperature and the temperature of the chalcogen source reaches an elemental volatilization temperature, and performing chemical vapor deposition to obtain the two-dimensional transition metal chalcogenide crystal. The large-area uniform monolayer or multilayer two-dimensional transition metal chalcogenide crystal can be obtained by the preparation method and can be applied to polarized photoelectric detection or topological field effect transistors.

The present invention provides a magnesium alloy rare earth compound flux and its production method. Its composition includes (wt%) 40-55% of magnesium chloride, 15-25% of potassium chloride, 12-25% of sodium chloride, 1-6% of calcium chloride, 5-15% of calcium fluoride, 1-8% of barium chloride and 3-10% of rare earth activator. Said ivnention flux has high activity, proper melting point, density, viscosity and surface tension, and can greatly raise mechanical property of magnesium alloy and corrosion resistance.