83results about How to "Solve permeability" patented technology

The invention provides a high-pressure pneumatic blasting pressure relieving and transmission increasing method, comprising the steps of constructing a blasting drill hole in a coal layer, and carrying out high-pressure water jet seam cutting operation in the blasting drill hole at intervals, so that a lead seam groove is formed in a coal body around the blasting drill hole; feeding a blasting steel pipe with plugged top part into the blasting drill hole, forming a plurality of air vents at the front part of the blasting steel pipe, and sealing a section inside a hole opening of the blasting drill hole by 8-10 m, so as to form a cement plug; and connecting the blasting steel pipe with a high-pressure air station through a pipeline at the exposed end of the blasting steel pipe, and opening a valve arranged on the pipeline to inject high-pressure gas, so that the high-pressure gas is jetted by the blasting steel pipe from the air vents. On the basis of forming cracks and fractures formed in the fractures and cutting grooves of the original coal body, the high-pressure gas instantly impacts the blasting effect, so that the cracks and the fractures can be continuously expanded, and a lot of new fractures can be generated. Finally, a mutually communicated large fracture screen is formed in the coal body by using the blasting drill hole as a center, so that the purpose of pressure relief and transmission increase of the coal body can be realized. Furthermore, the high-pressure pneumatic blasting pressure relieving and transmission increasing method has the advantages of simple operation, easiness of realization and obvious effect.

The invention relates to a polylactic acid toughening modifier in the technical field of high polymer material and a preparation method thereof. Lactide ring-opening polymerization is initiated on the terminal hydroxyl of poly (butylene succinate), and purification is carried out, thus obtaining the polylactic acid toughening modifier, the chemical structural formula is as follows. The modifier of the invention prepared by adopting degradable material can solve transport phenomenon and diosmose in the prior art.

The invention relates to a circulating well system for removing volatile organic compounds in underground water, and aims at providing a circulating well system suitable for different soil types to solve the problems of hydraulic transmission energy loss and poor soil permeability and avoid airflow short circuit caused by overlarge injection pressure as well as improve the influence radius and achieve remarkable repair effect. The system comprises an outer well, an inner well, a gas injection system, a gas extraction system and a reagent spraying system, wherein the inner well is arranged in the outer well, the gas injection system is used for introducing gas into the water of the inner well for aeration, a part of the gas mingled with organic pollutants is extracted by the gas extraction system and then adsorbed by an active carbon adsorption device to be discharged, the other part of the gas enters the outer well, and the reagent spraying system is used for sprays reagent liquid into the outer well.

The invention discloses a method for remedying an organism contaminated field by using a bidirectional stirring injection method. The method comprises the following steps: (1) flattening the contaminated field; (2) performing shallow layer ground hardening; (3) staking out in survey; (4) locating bidirectional stirring equipment in place; (5) moving a drilling rod of the bidirectional stirring equipment; (6) performing pre-stirring drilling; (7) drilling a drill rod, injecting a medicine and stirring bidirectionally, namely, injecting the medicine through an inner tube of a conveying pipeline, injecting a mixed solution of a catalyst and a buffer agent from a pipeline between the inner tube and the outer tube of the conveying pipeline, and mixing and stirring the medicine, the catalyst, the buffer agent and soil at the bottom of the conveying pipeline; (8) lifting up the drill rod through opposite stirring; and (9) moving the drill rod to a next pile site, and repeating the step (5) to (8) until the soil in all pile sites is remedied. By adopting the method, the loss of ground mixed medicines can be reduced, the reaction velocity and the reaction time can be effectively controlled, the problem that grout spills out and turns up from the ground surface can be effectively solved, and the remediation efficiency can be improved.

The invention relates to a polylactic acid toughening and modifying agent and a preparation method thereof. The method comprises the following steps of: proportioning the raw materials consisting of polyalcohol and hydroxy acid or polyacid/anhydride according to the mass ratio of 1:0.5 to 1:2,000, and carrying out condensation polymerization at 130-210 DEG C for 0.5-24 h to prepare a polyester polyol polylactic acid toughening and modifying agent polymer. Compared with the prior art, the polylactic acid toughening and modifying agent disclosed by the invention has the advantages of being nontoxic, harmless, completely biodegraded, free from negative effects on the environment and human health and the like.

The invention discloses a method for preparing a polymer electrothermal film. The method comprises the following steps: according to the weight percentage of raw materials, weighing 10 to 36 percent of colloidal graphite micro powder, 8 to 33 percent of conductive carbon black micro powder, 0.1 to 15 percent of nano carbon powder, 0.1 to 18 percent of zinc oxide powder, 0.1 to 13 percent of silver powder and 0.1 to 13 percent of magnesium hydroxide powder to prepare conductive composite filling powder; then preparing conductive composite filling glue by utilizing the conductive composite filling powder; preparing a heating thin film and simultaneously preparing insulating composite filling glue; preparing an insulating film by utilizing the insulating composite filling glue; and finally, preparing the polymer electrothermal film. The invention solves the problems of nonuniform heating temperature and high heating efficiency of a conventional electrothermal film. The invention also overcomes the defects of power attenuation, short working service life and the like of the conventional electrothermal film in the using process.

The invention provides a tensile load applying device for a concrete chloride ion permeability coulometric-process test, and a test method. In the tensile load applying device, four threaded holes are formed at the four corners of a steel bottom plate, four parallel screws are fastened into the threaded holes, and compression springs, and a tensile steel plate, a pressing steel plate and a top plate, which are parallel with the steel bottom plate, are sleeved on the screws; four threaded holes are formed in the middle of the four edges of the steel bottom plate, four through holes are formed in the middle of the four edges of the tensile steel plate, and tensile screws are inserted into the through holes; and the tensile screws above the tensile plate are sleeved with through hole ball seats and fixed nuts, and the lower ends of the tensile screws are connected with a tensile force measurement device. The invention also provides a concrete chloride ion permeability coulometric-process test method using the applying device. The applying device provided by the invention solves the problem that the conventional concrete chloride ion permeability test device is incapable of applying tensile load onto a tested piece, simulating the actual load state of in-service concrete member and measuring the concrete chloride ion permeability under a tensile load condition.

The invention relates to a method for sealing a liquid reservoir for a liquid flow battery, which comprises the following steps of: installing a seal cover on the liquid reservoir, filling the liquid reservoir with electrolyte, and sealing the liquid reservoir; indirectly sealing the sealed liquid reservoir with liquid or gas. The pressure in the liquid reservoir indirectly sealed by the liquid or gas always stays at one standard atmospheric pressure. The liquid or gas used for indirect sealing is sealing liquid or sealing gas. The sealing liquid or sealing gas and the liquid reservoir are connected through a conduit. One end of the conduit is outside the liquid reservoir. The invention has the advantages that the sealing method is simple, convenient and efficient; the problem of inconsistent charging states of battery anode and cathode caused by oxidation of low-valence ions and the problems of ion permeation, water permeation, membrane aging and the like caused by the problem of pressure unbalance are solved; the service life of the membrane can be effectively prolonged; and the coulomb efficiency of the liquid flow battery is improved and the service life of the liquid flow battery can be effectively prolonged.

The invention discloses a peptide dentritic macromolecular drug and a preparation method and application thereof, and belongs to the field of biomedicine. The drug comprises a peptide dentritic macromolecular skeleton, and terminal-group functionalized groups. The biological activity of the drug is ensured through the terminal-group functionalized groups; and the periphery of the peptide dentritic macromolecular drug can be grafted with a lot of terminal-group functionalized groups, so that the biological effect of the terminal-group functionalized groups is effectively amplified by the amplification effect of dendritic macromolecules. The drug has an accurate molecular structure and abundant surface functional groups, is good in water solubility, and also has the biological characteristics of being similar to globulin, easy to be taken in by cells and the like; the biological effect of the peptide dentritic macromolecules is enriched; and the development of peptide drugs is promoted. The preparation method is simple in technology; and the structure of the peptide dentritic macromolecular drug is accurately controlled by controlling preparation of various raw materials.

The invention relates to the technical application field of coal mine fire preventing and extinguishing, and provides economic and environment-friendly gel foam for preventing and curing coal spontaneous combustion. The economic and environment-friendly gel foam is prepared from the components in percentage by weight: 4% to 35% of water glass, 0.4% to 3% of a foaming agent, 0.1% to 3% of a foam stabilizing agent, 1% to 5% of a coagulant, and the balance of water; and the foaming agent is formed by compounding two or more anionic-type foaming agents. According to the economic and environment-friendly gel foam for preventing and curing coal spontaneous combustion, the adopted foaming agent is formed by compounding two or more anionic-type foaming agents, an adopted gelatinizing system is composed of the water glass and the coagulant, the cost is low, economy and environmental protection are realized, and the gel foam is non-poisonous and harmless during using and has good economic benefits. The obtained gel foam maintains the advantages of high fluidity and good aggregation of water-based foam before gelatinizing, and after gelatinizing, the advantages of the outstanding cooling effect and the good leak sealing effect of water glass gel are maintained; and the gel foam is good in inhibition and fire extinguishing effect, the fire source temperature, thermal radiation and CO output can be significantly reduced, fire extinguishing is stable, and the reignition phenomenon does not occur.

The invention relates to an agricultural insecticide composition, and in particular discloses an insecticide composition containing spinosad and etofenprox. When the insecticide composition is a suspending agent, a wettable powder or a water dispersible granule and has a formula comprising the following components: 1-70 percent of active component, 1-20 percent of compound auxiliary agent and 10-98 percent of stuffing; when the insecticide composition is an aqueous emulsion or a microemulsion, the formula of the insecticide composition comprises the following components: 1-40 percent of active component, 1-19 percent of compound auxiliary agent, 5-40 percent of solvent and 1-93 percent of water; and the active component comprises spinosad and etofenprox in the mass ratio of 1:(0.045-500). The insecticide composition has the advantages of good insecticidal effect, long pest control time, difficult generation of resistance for pests, safety for crops, environmental protection, wide insecticidal range, low cost and the like.

The invention discloses a black ink for a gel-ink pen and a preparation method thereof. The black ink comprises the following raw materials by weight percent: 30%-40% of carbon black slurry, 5%-30% of organosilicon modified acrylic resin emulsion, 10%-30% of solvent, 0.3%-0.8% of thickening agent, 1%-3% of pH regulator, 0.2%-2.0% of lubricant, 0.3%-2.0% of antirust additive, 0.2%-2.0% of preservative, 0.02%-0.5% of defoamer and the balance of deionized water. The ink has the advantages of uniform dispersion, appropriate viscosity, high system stability, good high-low temperature resistance and the like; and the prepared gel-ink pen is smoothly used for writing without leakage, has long uncapping time and can be used for normally writing under the environment of minus 20 DEG C-60 DEG C. The invention also discloses the preparation method of the ink. The preparation method has the characteristics that the process is easy to control and convenient for regulation.

The invention discloses a method and a device for measuring field slope surface infiltration performance and a permeability coefficient. A field slope surface double-cycle infiltrator is adopted; and the device comprises a slope infiltration ring (3), a rainfall cylinder (2) and two Marriot water tanks (1), wherein the slope infiltration ring (3) is used for being pressed into field slope surface soil and has a concentric double-ring structure; the rainfall cylinder (2) is used for allowing the rainfall capacity in an inner ring and an outer ring of the slope infiltration ring (3) to be adaptively equal to the saturated deposited water-free infiltration amount and has a concentric double-ring structure; and the two Marriot water tanks (1) are used for supplying water into the double rings of the rainfall cylinder (2). The measurement method disclosed by the invention comprises the following steps: measuring the saturated wet deposited water-free infiltration amount of the slope surface (containing the horizontal surface) and the rainfall capacity thereof, obtaining a relationship between the soil surface zero pressure saturated infiltration and the time, thereby obtaining the rainfall infiltration performance and the saturated permeability coefficient of the soil surface.

The invention provides an ernst bloch surface wave-based porous silicon biosensor and a design method thereof. The biosensor comprises a silicon substrate layer, a Bragg reflector layer, a buffer layer and a round hole type photonic crystal grating layer which are sequentially connected from top to bottom; the Bragg reflector layer comprises high-porosity porous silicon layers and low-porosity porous silicon layers, wherein the high-porosity porous silicon layers and the low-porosity porous silicon layers are alternately arranged in N periods; and air hole periodic arrays arranged in a latticemode are arranged on the round hole type photonic crystal grating layer; the air hole periodic arrays are arranged in a lattice constant a. According to the invention, a strict coupling wave analysismethod is utilized, and a simple all-porous silicon multilayer dielectric grating structure is designed on the silicon substrate layer for the first time, so that the sensitivity of the porous silicon biosensor is greatly improved; and the biosensor has the advantages of being high in detection sensitivity, simple in structure, accurate in detection and the like.

The invention relates to a pipeline maintaining device and maintaining method and a sewer pipeline maintaining car. The pipeline maintaining device comprises a moving component (7), a blocking component and a grouting component, wherein the moving component (7) is used for moving to a to-be-repaired position of a pipeline in the pipeline; the blocking component is arranged on the moving component(7) and used for enabling the position, wherein the to-be-repaired position is located, in the pipeline to form a sealed region (O) through state variation; and the grouting component is arranged on the moving component (7), used for filling the sealed region (O) with grouting slurry and guiding the grouting slurry to flow to the to-be-repaired position so as to realize pipeline repair. Accordingto the pipeline maintaining device, the damaged pipeline can be rapidly repaired through a chemical grouting method, the repair efficiency of the sewer pipeline can be greatly increased, and problems,such as soil erosion, surface subsidence, osmosis and inflow, caused by pipeline damage, are effectively solved; and besides, remote operation also can be realized more safely and conveniently, and the repair mechanization of the pipeline is realized.

The invention discloses a fully biodegradable component-toughened PLA composite material and a preparation method thereof. The material is prepared from, by weight, 66-95.9 parts of polylactic acid, 3-15 parts of an alginic acid natural polymer, 1-18 parts of vegetable oil or derivatives thereof and 0.1-1.0 part of an alkaline catalyst. The preparation method comprises the following steps of drying the components, conducting blending and granulating in an internal mixer, then putting granules into an extruder for extrusion, and performing injection molding by an injection molding machine. Thecomposite material has the advantages that the production cost is low, the material is biodegradable, a plasticizer is unlikely to permeate and migrate, no pollution is caused, a good toughening effect is achieved, and the mechanical property is excellent.

The invention discloses a method for fermentation production of L-tryptophan with high efficiency. Through modification of a fermentation device and optimization of a fermentation medium formula and a fermentation technology, the problems of low fermentation unit and short fermentation cycle in existing production technologies are solved. The method comprises steps: a sugar supplementing system of an existing device is modified, and a single pipeline is replaced by a sugar distribution assembly through which sugar is distributed in a fermentation liquid rapidly and uniformly; the ratios of components in fermentation medium are optimized and adjusted; during the fermentation process, dissolved oxygen is controlled at a certain level through adjustment of stirring speed and air flow, the pH value is controlled through fed-batch of high-concentration ammonia water, the residual sugar content is controlled below 0.1% through fed-batch of sugar (comprising glucose and liquid sugar), and the culture is finished after 40-60h. The method prolongs the fermentation cycle, lowers the labor intensity, raises the fermentation unit greatly and lowers the production cost without addition of any extra device and manpower investment.

The invention relates to a measuring device and a measuring method for rock high temperature compression coefficient and permeability. The measuring device is characterized by comprising a high pressure kettle, a heating system, a confining pressure pump system, a pore pressure pump system, a first air release valve, a second air release valve, a temperature controller and a control system; a rock core is fixedly arranged on the middle part of the high pressure kettle; a temperature sensor is arranged on the inner side of the high pressure kettle; the heating system is fixedly arranged on the outer periphery of the high pressure kettle; the high pressure kettle is respectively connected with the confining pressure pump system, the pore pressure pump system, the first air release valve and the second air release valve through the heating system by the first to fourth high pressure pipelines; the temperature controller is used for heating the confining pressure fluid in the high pressure kettle and the rock core through the heating system and monitoring the rock core temperature in real time through the temperature sensor; the control system is used for controlling the confining pressure pump system and the pore pressure pump system to apply confining pressure and pore pressure into the high pressure kettle and monitoring the downstream pressure change of the pore pressure system in real time through the pressure sensor. The measuring device can be widely applied to the field of development and research for thick oil thermal recovery and development of geothermal resources.

The invention discloses preparation and application of a whisker-shaped ceramic membrane with low cost and high permeability, and belongs to the technical field of preparation of high-permeability membranes. According to the method, tungsten oxide is added to form thewhisker-shaped ceramic membrane; the ceramic membranehas lower mullite forming temperature, and the sintering cost is greatly reduced; higher porosity, higher mechanical strength and better mechanical strength are achieved, and the permeability is improved; and the surface is rougher, so that the wettability of the membrane is effectively enhanced, and the membrane has higher oil pollution resistance in the oil-water separation process. In the preparation process, a phase inversion method or an extrusion molding method is adopted, so that hollow fibrous, tubular or hollow flat-plate-shaped and large-size tubular or flat-plate-shaped whisker structure mullite ceramic membranes can be respectively obtained, and can be used for large-scale industrial application. The whisker-shaped mullite ceramic membrane shows stable high permeation flux and high oil retention rate for oil-water separation (such as high-concentration and high-acid-base environments and complex oily wastewater), and has a wide application prospect.

An acid ore washing biological leaching process used for high mud alkaline uranium ore comprises the following main steps: after crushing and screening of raw ore, sending + 30 mm particle grade ore into a heap field for heap construction, and performing acid ore washing treatment on-30mm particle grade ore. Sulfuric acid is added into a washing solution, then part of basic gangue is removed by ore washing, the washing solution is separated and precipitated, and an acid solution can be recycled. After processing by the acid ore washing system, + 0.074mm particle grade sand ore is sent to the heap field for heap construction, and-0.074mm particle grade sand ore enter the intensive agitation leaching process. An agitation leaching solution and a heap leaching solution are merged, and enter ion exchange resin adsorption desorption process, and finally a qualified enriched uranium product is obtained. According to the process, in the ore washing process, the part of basic gangue easy to dissolve is removed by neutralization, the problems of poor heap leaching permeability, low uranium leaching rate and the like caused by existence of mud ore and dissolution precipitation of the basic gangue can be solved, the uranium recovery rate is improved, high mud alkaline uranium ore mineral resources can be comprehensively utilized, and greater economic benefits can be obtained.

The invention provides a temperature-pressure-osmotic pressure coupling electromagnetic loading three-axis SHPB test system; the test system mainly comprises an electromagnetic pulse emission system,an axial pressure servo control loading system, a confining pressure servo control loading system, a temperature control system, an osmotic pressure loading system, a rod piece system and a data monitoring and collecting system. According to the system, on the basis of a traditional SHPB, a confining pressure, temperature and osmotic pressure real-time loading and controlling system is innovatively introduced, so that the technical problem that an existing test device cannot simulate the rock mass dynamics response research of deep rock mass under the coupling effect of temperature-pressure-osmotic pressure and dynamic disturbance load is solved.

The invention relates to a method for manufacturing an unburned ceramic tile green body having a permeable layer. The method comprises the following steps: A, polishing a dried unburned ceramic tile green body; B, carrying out ink-jet printing on organic permeable colored glaze ink; C, carrying out ink-jet printing on organic permeation-promoter ink; and D, drying for 10-60 minutes at a temperature of 50-200 DEG C. According to the invention, permeable layer formed on the ceramic tile brick prepared by using the unburned ceramic tile green body has a certain thickness, the permeated permeable layer is mutually combined with a precoat having a clear textured pattern after permeation to jointly constitute a three-dimensional decorative effect so that the decorative pattern is wear resistant, and the problems that the printed decorative layer formed by the conventional ink jet printing is free of three-dimensional layered sense and is not wear resistant and the like in the prior art are solved.

The present invention relates to a low-penetration fuel hose and preparing method thereof. The low-penetration fuel hose has a four-layer structure which is composed of the following components: a fluorubber inner layer (1), a chlorosulphonated polyethylene middle layer (2), a reinforcing layer (3) and a chlorosulphonated polyethylene outer layer (4). The preparing method comprises the following steps: 1) extruding step: compositely extruding out the fluorubber inner layer and chlorosulphonated polyethylene middle layer, weaving a weaved layer with aramid fiber thread, and extruding out the chlorosulphonated polyethylene outer layer rubber; and 2) vulcanizing forming process: adopting a one-segment vulcanizing method with the following vulcanizing parameters: 130-180 DEG C of vulcanizing temperature and 5-60 min of vulcanizing time. The low-penetration fuel hose of the invention settles the problem of high penetration of prior low-temperature fuel hose and environment pollution.

The invention relates to a P-MBR biochemical treatment system and process; the P-MBR biochemical treatment system comprises a mixing zone, an adsorption flocculation zone, a biochemical reaction zone, a settling zone, and a membrane filtration zone; the mixing zone is used for waste water introduction, active filling material addition, and preliminary mixing of waste water to be treated with newly-added filling materials; the adsorption flocculation zone is used for accommodating and adsorbing the waste water mixed in the mixing zone, and retaining the waste water for a while for full combination of harmful substances in the waste water with the active filling materials so as to generate flocculation; the biochemical reaction zone is used for receiving the waste water reacted in the adsorption flocculation zone, and allowing the waste water and the active substances to fully react in the biochemical reaction zone; the settling zone is used for precipitating the waste water after biochemical reaction in the zone to obtain precipitates in the mixed liquid so as to separate clear liquid; the membrane filtration zone is used for filtering the clear liquid formed in the settling zone, and extracting the purified water formed after filtration. The invention provides the water treatment system and the process with stable operation and simple process flow.

The invention belongs to the field of novel cigarettes, and particularly relates to a cigarette capable of preventing substances in a fuming medium from leaking and diffusing and a preparation methodof the cigarette. The cigarette comprises a fuming medium rod (1) and a composite cigarette paper (2), the composite cigarette paper (2) wraps the outer side of the fuming medium rod (1), the composite cigarette paper (2) is formed by overlapping a metal layer (a), an oil-proof hydrophobic layer (b) and two adhesive layers (c) between the metal layer (a) and the oil-proof hydrophobic layer (b), and the metal layer (a) is in contact with the fuming medium rod (1). The invention further discloses a preparation method of the cigarette. The composite cigarette paper formed by compounding the metallayer and the oil-proof hydrophobic layer is adopted, the metal layer plays a role in permeation prevention, the oil-proof hydrophobic layer arranged outside the metal layer plays a role in preventing substances permeating from the bonding position of the end face of the tobacco medium section and the lap joint of the composite cigarette paper from diffusing on the surface of the composite cigarette paper, and meanwhile the oil-proof hydrophobic layer plays roles in permeation prevention and diffusion prevention.

The invention provides a pressureless polyethersulfone hollow fiber film with a highly-asymmetric spongy structure. The pressureless polyethersulfone hollow fiber film is prepared by preparing a transparent, uniform and stable film casting liquid from polyethersulfone, an organic polar solvent, a hydrophilic second polymer and an organic micromolecular additive, extruding the film casting liquid from an annular gap via the spinning head of a molding spinning device, spraying gas used as an internal diameter maintenance agent through the center tube of the spinning head so as to prepare a hollow fiber, allowing the hollow fiber to pass through an air gap with a length of 0 to 20 cm in 0 to 10 s after the hollow fiber leaves the spinning head, then soaking the hollow fiber in a water bath with a temperature of 0 to 90 DEG C for consolidation forming so as to prepare a polyethersulfone hollow fiber film, fully extracting the polyethersulfone hollow fiber film in hot water with a temperature of 20 to 90 DEG C and carrying out drying. The pressureless polyethersulfone hollow fiber film with the highly-asymmetric spongy structure has far better permeation flux and interception capability compared with common polyethersulfone hollow fiber films; and the preparation method for the film is simple, economic and environment-friendly, is easy to operate and has high production efficiency.

The invention relates to the field of metal metallurgy, in particular to a method for segmented acid-adding and circulating leaching of coarse particles in low-grade nickel oxide ores. The method comprises the steps of firstly washing raw ores, screening, breaking the part on a screen to a certain particle size, adopting the method of segmented acid-adding, circulating spray-leaching and washing an ore heap after spraying for extracting nickel and cobalt from low-grade laterite nickel ores, returning washing liquid to the preparation stage of acid liquid and continuing the spraying of a new heap. The method has the advantages of short process flow, simple equipment, low investment, low cost, environment-friendly property and high leaching rate of the nickel and the cobalt, and can treat the low-grade oxidized laterite nickel-cobalt mineral resources which can not be treated by the traditional dressing-metallurgy process, expand the utilization range of the resources and improve the comprehensive recycling level of nickel and cobalt metals.

The invention relates to an indoor model test device for testing permeability of a geomembrane and an operation method, the indoor model test device includes a visual monitoring box system, a boundary condition regulation system, a geomembrane fixed adhesive system, a comprehensive measurement system and an information feedback analysis system. A visual monitoring box is used as a main body, toughened glass is used as a material, boundary conditions are controlled by a variable water level water box room, and the geomembrane fixed adhesive system comprising a geomembrane, a water permeation board, a cementing agent, a plugging layer and then like is used for bonding and fixing of the geomembrane. The boundary conditions of working states and paving conditions of the geomembrane can be studied by the indoor model test device for concrete design, the indoor model test device can be used for full-range and multi-level monitoring of pore water osmotic pressure, soil settlement, seepage flow, seepage time, permeability area, water level difference and seepage path length, permeability of a geotextile material can be evaluated and measured, compared with the previous, the indoor model test device is more simple, practical and comprehensive, and has obvious advantages.

The invention discloses a steel wire rope lubricating grease composition for low-temperature environments. The composition is characterized by containing the following ingredients in parts by weight: 3.2-5.2 parts of 12-OH lithium stearate soap, 0.8-1.3 parts of lithium stearate soap, 54-76 parts of mineral base oil, 15-35 parts of poly-alpha-olefin synthetic oil and 1.0-3.5 parts of colloidal graphite. According to the composition, poly-alpha-olefin synthetic oil with excellent low-temperature properties is adopted as base oil, and meanwhile, the colloidal graphite serves as a friction reducer, so that novel semi-fluid steel wire rope lubricating grease capable of meeting low-temperature use requirements is obtained finally.

The invention discloses a heat sink structure double-carrier LED (Light-Emitting Diode) drive circuit package and a manufacturing method thereof. The package comprises a power device and a control chip both fixed on base islands, the control chip is connected with the power device and an inner pin, the power device is connected with the inner pin, the inner pin is connected with an external pin, and sealant bodies are arranged on the base islands by plastic packaging; the base islands are two mutually isolated base islands, the power device is adhered on one base island through a conductive adhesive film, and the bottom surface of the base island, opposite to the power device, is located outside the sealant body; and an IC control chip is adhered on the other base island through an insulating adhesive film. The back surface of a wafer is coated with an insulation paste, the wafer is adhered on the base island after being cut into single crystalline grains, the power device is adhered on the other base island, and pressure welding, plastic packaging, curing and detection are carried out through the existing technology; the bottom surface of the first base island, without any adhered device, is located outside the sealant body, and thus, the heat sink structure double-carrier LED drive circuit package is obtained. The package can quickly dissipate a large amount of heat, the insulation paste is not liable to be broken down, and the insulation paste and the conductive adhesive are not interpenetrative to each other.