103results about How to "Reduce penetration rate" patented technology

The invention relates to an air-permeability aluminum foil and a preparation method thereof, wherein the aluminum foil is mainly suitable for air-permeability packaging in requirements of agricultural production and daily life. The aluminum foil is characterized by being made of 3003 alloy, the thickness of the aluminum foil is 0.03-0.05 mm, pinholes which can reach more than 10,000 every square meter are densely distributed on the surface of the aluminum foil, and the maximum diameter of each pinhole is not more than 0.05 mm. The preparation method comprises the following process steps: batching, smelting, cast-rolling, cold-rolling, interannealing, cold-rolling, and foil-rolling to reach the finished thickness, slitting into a finished specification, and finished annealing. The invention has the advantages of good air permeability, strong corrosion resistance and strong oxidation resistance.

The present invention provides the recipe of chlorine ion penetration resisting reinforcer for concrete in harbor engineering. The chlorine ion penetration resisting reinforcer consists of superfine silica powder 15-20 wt%, washed and calcined kaolin 20-25 wt%, high grade fly ash 20-25 wt%, ground blast furnace slag 20-25 wt%, nanometer fiber 5-10 wt%, superplasticizer 6 wt%, slump keeping agent 0.09 wt%, air entraining agent 0.09 wt%, and organic active excitant 0.12 wt%. The chlorine ion penetration resisting reinforcer has inorganic components as main functional materials dispersed homogeneously in concrete cementing material, and can improve the micro structure and hydration product composition inside concrete, raise compactness, adsorb and fix chlorine ion and lower the penetration of chlorine ion in hardened concrete, so as to improve the chlorine ion penetration resisting capacity of hardened concrete.

The invention belongs to the technical field of refractory materials, especially refractory materials for nonferrous smelting, and especially relates a copper composite high-performance magnesia-chrome brick and a manufacturing method thereof. The brick comprises 1-10 wt% of copper composite magnesia-chrome synthetic sands with the particle size being 3-5 mm, 10-35 wt% of copper composite magnesia-chrome synthetic sands with the particle size being 1-3 mm, 10-25 wt% of copper composite magnesia-chrome synthetic sands with the particle size being 0.088-1 mm, 1-5 wt% of fused magnesia-chrome sands with the particle size being 3-5 mm, 1-15 wt% of fused magnesia-chrome sands with the particle size being 1-3 mm, 2-13 wt% of fused magnesia-chrome sands with the particle size being 0.088-1 mm, 5-20 wt% of fused magnesia-chrome sands with the particle size being not more than 0.088 mm, 1-5 wt% of fused magnesia with the particle size being 3-5 mm, 1-15 wt% of fused magnesia with the particle size being 1-3 mm, 2-13 wt% of fused magnesia with the particle size being 0.088-1 mm, 5-20 wt% of fused magnesia with the particle size being not more than 0.088 mm, 2-10 wt% of chromium concentrate with the particle size being not more than 0.088 mm, 1-6 wt% of a composite additive and 3-5 wt% of an (externally added) binder. Magnesia-chrome brick wastes generated by the nonferrous smelting can be fully used reasonably and effectively in the invention.

The invention discloses an NGAL time-resolved fluoroimmunoassay nanometer immunochromatographic quantitative detection test paper strip and a preparing method thereof. The test paper strip comprises a backing substrate plate. The backing substrate plate is provided with a nitrocellulose membrane, a sample combining pad and a water absorbing membrane. The sample combining pad and the water absorbing membrane are respectively laminated on two ends of the nitrocellulose membrane. The sample combining pad is covered with an NGAL monoclonal antibody labeled with a time-resolved fluorescent substance. The nitrocellulose membrane is provided with a detection line and a quality control line. The detection line is covered with an NGAL monoclonal antibody of another epitope. The quality control line is covered with goat anti-rat IgG. The test paper strip and the method are characterized by high sensitivity, high specificity, good stability, no radioactive contamination, and the like and can be widely applied to NGAL clinical immunoassay and scientific research.

An orbital tool apparatus and method of using the apparatus for boring, drilling, reaming, and cutting having a tool housing, a tool collar located within the housing, the tool housing having the ability to couple to a conduit structure, fluid orbiting jets within the tool collar, and a tool funnel located below the tool collar and within a lower portion of the tool housing. The orbital tool creating a bore in a surface, when fluid flowing into the orbital tool via a conduit is directed out of the orbital tool towards the structure, a portion of the fluid flowing within the orbital tool being diverted through the fluid orbiting jets causing the diverted fluid to impinge against the tool funnel, causing the tool funnel to oscillate creating a sweeping flow towards the surface.

The invention relates to a self-healing cement-based material containing bacterial spores and a preparation method thereof. The self-healing cement-based material consists of cement, water, calcium lactate and bacterial spores, wherein the mass ratio of the water to cement is 0.3-0.5, the mass of calcium lactate accounts for 1%- 5% of the mass of cement, 10<6>-10<9> spores are added into 1cm<3> of cement-based material. The preparation method comprises the steps of: inoculating alkali-resistant Bacillus, culturing to obtain strain solution having a high spore forming rate, heating the strain solution in a 80 DEG C water bath for 20min, centrifugally cleaning to obtain a spore suspension; weighing the required cement, proportionally weighing and adding calcium lactate, stirring until calcium lactate is evenly distributed in the cement; mixing the spores suspension which is used for replacing a part of mixing water with the rest water evenly in a shaking manner and pouring into the cement and calcium lactate, and stirring evenly, and pouring into a mold for forming.

The invention relates to a zircon mullite brick for a cement kiln and a preparation method thereof. According to the technical scheme, by weight, 58-75% of particles, 3-20% of zircon mullite fine powder, 3-10% of Guangxi white clay fine powder, 1-3% of Ti3AlC2/Ti3SiC2 composite powder, 2-7% of monatomic silicon fine powder, 3-15% of raw bauxite micro powder and 0.5-1.0% of zirconium boride fine powder are adopted as a raw material A, cerium chloride accounting for 0.5-2% of the raw material A by weight and sulfite lye accounting for 3-8% of the raw material A by weight are additionally added,stirring, forming and drying are performed, the temperature of 1,400-1,600 DEG C is kept constant for 2-8 h, and the zircon mullite brick for the cement kiln is obtained. According to the particles, kyanite tailing fine powder or gangue fine powder are adopted as a raw material B, yttrium oxide fine powder accounting for 0.5-2% of the raw material B by weight and sulfite lye accounting for 4-6% ofthe raw material B by weight are additionally added, uniform mixing, forming and drying are performed, the temperature of 1,300-1,500 DEG C is kept constant for 3-9 h, and cooling and breaking are performed to obtain the particles. The cost is low, and the prepared zircon mullite brick for the cement kiln is good in abrasion resistance, low in heat conductivity coefficient, good in thermal shockresistance and good in corrosion resistance.

The invention provides a membrane electrode complex of a direct methanol fuel cell and a preparation method and a direct methanol fuel cell thereof. The membrane electrode complex of a direct methanol fuel cell comprises an anode composite membrane layer, a liquid electrolyte layer and a cathode composite membrane layer which are orderly arranged; the anode composite membrane layer comprises an anode diffusion layer, an anode catalytic layer and an anode proton exchange membrane which are orderly arranged; the liquid electrolyte layer comprises: a porous material and liquid electrolyte adsorbed on the porous material; the cathode composite membrane layer comprises a cathode diffusion layer, a cathode catalytic layer and a cathode proton exchange membrane which are orderly arranged. The membrane electrode complex of a direct methanol fuel cell provided by the invention has a low methanol permeation rate and high proton conductivity, is applicable to a high methanol concentration, thus provides higher energy density for the methanol fuel cell, and increases the fuel utilization rate.

The invention discloses a porous biosensor and making and application methods. The porous biosensor is characterized by sequentially comprising a substrate, an electrode layer and a polymer film layer. A polymer film in a substrate electrode sensing region is removed, and the exposed substrate electrode region and the edge of the polymer film layer form a well-like structural region array; a zinc oxide coating with a porous structure is filled in each well-like structural region; and bioactive substance molecules with negative electricity are adsorbed in a porous zinc oxide structure under the action of static electricity, and a nano-scale narrow bottleneck structure is adopted between inner holes of each coating with the porous structure.

The invention discloses fertilizer for repairing soil polluted by manganese ore. The fertilizer is prepared from, by weight, 7-8 parts of peat soil, 31-33 parts of plant ash, 15-16 parts of beer residues, 22-25 parts of chicken feather, 4-6 parts of chitosan, 3-4 parts of humic acid iron, 2-3 parts of calcium sulfate, 30-32 parts of palm leaves, 14-16 parts of siderite slag, 14-16 parts of limonite slag, 65-70 parts of orange peel, 4-6 parts of EM compound microorganism bacterium agent and an appropriate amount of water. For the characteristics that soil polluted by manganese ore is low in fertility, poor in water-retaining property and high in heavy metal content, through the collaborative complexing and degrading effects of biochar immobilized microorganisms and lots of humus, on one hand, the water permeation speed is decreased, the water-retaining potential of soil is increased and the water-retaining property is enhanced by increasing the porosity of soil, and on the other hand, the content of organic carbon and humus in soil is increased and the fertilizer retention capacity is improved.

The invention relates to a thin film insulating core non-conducting electrode cap and an annular nugget resistance spot welding method, and belongs to the technical field of resistance spot welding. The thin film insulating core non-conducting electrode cap comprises an electrode cap core part and an electrode cap peripheral part, wherein the two parts are made of homogeneous materials with good thermal conductivity; a layer of thin film insulating material is sprayed on the outer side surface of the electrode cap core part; and the electrode cap core part with a thin film insulating layer isin interference fit with the electrode cap peripheral part. The electrode cap core part and the electrode cap peripheral part have the same spherical radius, and the two parts are in smooth transitionat the junction of the end faces. In the welding and electrifying process, due to the existence of the insulating layer, current can circulate in the peripheral area of the contact surface of the electrode cap and a workpiece, and annular current distribution is formed. Under the action of annular heat distribution, an annular nugget is formed between workpieces, and the reduction of the penetration rate under the condition of the same connecting area is realized, so that the joint strength is guaranteed under the condition that the welding heat input is reduced, the indentation and deformation are reduced, and the joint performance of resistance spot welding is further improved.

The present invention provides an enantioselective composite membrane useful for separation of optical isomers and the process for the preparation thereof. The invention further provides a membrane based pressure driven separation process for separation of enantiomers from their mixture to obtain optical pure isomers. The present invention also provides a membrane based method for optical resolution of racemic mixtures of amino acids to obtain optically pure amino acids.

The invention relates to a large-scale cultivation method of pumpkin seedlings. The method includes the steps of firstly, preprocessing seeds; secondly, processing before sowing; thirdly, performing spaced sowing, and performing daily weeding and pest control. Experiments show that the method can effectively avoid diseased and weak seedlings, the cultured seedlings can be sold, and the method is of great significance to the large-scale cultivation of the pumpkin seedlings.

The invention discloses a method of freezing Schwann cells by a compound low-temperature cryopreserving system. The method comprises the following steps of: heating amino acid gel factors and dissolving the same in a cell culture medium, filtering and degerming the cell culture medium, and preparing a cell suspension liquid with the cell culture medium containing the gel factors; dropwise adding a cell culture medium containing a compound freezing protecting agent into the cell suspension liquid at 0-4 DEG C and uniformly mixing the mixture, wherein the compound freezing protecting agent is prepared by mixing a permeable freezing protecting agent and a non-permeable freezing protecting agent; and putting a cryopreserving tube in a programmed cryopreserving box to be frozen for 24h at 80 DEG C below and then transferring the cryopreserving tube to liquid nitrogen to be cryopreserved. The supermolecular gel formed by self-assembling the amino acid gel factors has a unique three-dimensional netty structure. When the freezing protecting agent is dropwise added, cells are coated by the supermolecular gel, so that the permeating damage of the freezing protecting agent is reduced; in temperature-reducing and restoring processes, damage of ice crystals is reduced as the three-dimensional netty structure of the supermolecular gel limits growth and recrystallization of the ice crystals.

The invention discloses an electrochemistry in-situ dirt removing method of radioactive contaminant on the surface of metal. A liquid storage tank is involved in the method. A cathode plate is installed below the liquid storage tank. A guide wire is connected to the cathode plate. A through hole is formed in the bottom of the liquid storage tank. The bottom of the through hole penetrates through the liquid storage tank and the cathode plate sequentially. An anode contactor is detachably connected to the exterior of the liquid storage tank. The anode contactor is provided with a storing cavityused for storing the cathode plate. The anode contactor is provided with a ring-shaped sealing part. The interior of the ring-shaped sealing part and the bottom face of the anode contactor form a washing cavity. An opening is formed in the bottom of the anode contactor. The opening communicates with the storing cavity and the washing cavity. According to the method, for the small contaminant area,fixed-point in-situ dirt removing can be carried out on the radionuclide area by means of the washing cavity formed by the anode contactor and the ring-shaped sealing part, the dirt removing precision is high, the dirt removing effect is good, the electrolyte solution is prevented from being wasted on the surface of the metal which does not need to be washed, the washing cost is saved, and the amount of second-time waste liquid is small.