119results about How to "Maintain permeability" patented technology

Methods and devices are provided for preparing and separating biological analytes. In one embodiment, one or more filtration devices or filter plate wells can be formed by clamping a filter sheet between first and second plates having at least one connecting cavity. First and second moveable core pins positioned on opposed sides of the sheet can be moved to remove portions of the sheet. A molten plastic can be injected to fill the volume between the cores and cavities and to form a liquid-impermeable sleeve wall or walls, each being separately sealed at the bottom to the perimeter of the sheet portion, each having liquid permeable regions of said removed and sealed sheet portion, and each remaining open at the top. Various exemplary configurations for filtration devices or filter plate wells are also disclosed.

Methods are described to make strong, tough, and / or lightweight glass-ceramic composites having a crystalline phase and an amorphous phase generated by viscous reaction sintering of a complex mixture of oxides and other materials. The present invention further relates to strong, tough, and lightweight glass-ceramic composites that can be used as proppants and for other uses.

A method and apparatus for the inspection of electrically conductive components is described. The described apparatus comprises a sensor module having a magnetiser unit suitable for generating a variable DC magnetic field within the test component and an eddy current probe. The variable DC magnetic field and eddy current probe are configured to perform a partial saturation eddy current test upon the test component. The eddy current probe further comprises a magnetic field sensor that provides a means for measuring the permeability within the test component. Employing the magnetic field sensor provides apparatus that is more accurate and flexible in its modes of operation since such sensors provide a means for the actual permeability of a material being tested to be measured. The described methods and apparatus find particular application in the inspection of tubular components used in the oil and gas exploration and production industries.

The present invention provides a method for improving the performance of polyimide membranes as used in solvent-resistant nanofiltration. More specifically the method of the present invention allows to improve the solvent stability of the polyimide membranes to solvents or solvent mixtures that would dissolve polyimide under the conditions applied during the filtration, such as dimethylforrnamide (DMF), N-methylpyrrolidinone (NMP), dimethylacetamide (DMAC), tetrahydrofuran (THF), y-butyrolacton (GBL), dimethylsulphoxide (DMSO) and chlorinated solvents.

The invention discloses sea asparagus water-solubility biogenetic salt which comprises the following ingredients by weight part: 20-50 percent of water-solubility organic component and 50-80 percent of water-solubility inorganic salt; the invention further discloses a preparation method of the sea asparagus water-solubility biogenetic salt, comprising the following steps: collect pulp, crisp and tender non-lignified overground part of the sea asparagus before fruit cluster of the sea asparagus is formed; clean the overground part with cleaning water at less than or equal to 10 DEG C; the cleaned sea asparagus is crushed to pass through a sieve with 60-100 meshes; the crushed sea asparagus is pulped with cleaning water which has 0.5-20 times of weight of the crushed sea asparagus and at below 20 DEG C, the grout carries out slag-juice separation, the juice is concentrated to have 1.05-1.3 of specific gravity, and then the concentrated juice is sprayed and dried by a spray drying tower, so as to obtain the sea asparagus water-solubility biogenetic salt. The sea asparagus water-solubility biogenetic salt has the advantages of rich nutrition constituents, good water solubility, being easy to be adsorbed by human body and wide application range.

The invention provides an additive for balancing the gastrointestinal health of animals, which is prepared by absorbing 3 to 15 percent of tributyrin, 21.5 to 52.5 percent of lactic acid and 3.5 to 7.5 percent of formic acid with special carrier white black carbon by grade and layer respectively and then combining the mixture with 1 to 10 percent of glutamine. The additive has the effects of controlling diarrhea and accelerating restoration of injured intestinal tract, and starting from a philosophy of balancing the relationship between the gastropore and the intestinal tract, saving resources, reducing environment loads and improving quality of livestock products, a comprehensive gastrointestinal health management scheme is provided.

The invention discloses a series of skin care products with oat protein peptide as a basic component and a preparation method thereof, which belongs to the field of health care. The series of the skin care products overcome the defects of side effects and poor absorption of the conventional skin care products. The series of the skin care products comprise oat protein peptide smoothing toner, oat protein peptide essence, oat protein peptide day cream and oat protein peptide night cream. The raw materials of the series of the skin care products comprise purified water, propylene glycol, oat protein peptide, hyaluronic acid, natural squalane, marine polysaccharide, water-soluble vitamin E, water-soluble jojoba oil, water-soluble lanolin, methyl-p-hydroxy benzoate, propyl p-hydroxybenzoate, hydroxyethyl cellulose and fresh hundred-flower essence. The preparation method comprises the step of preparing the series of the skin care product in the mixing process through emulsification or partial emulsification and partial hydration according to the different products. The series of the skin care product have the following advantages that: oat active peptide can significantly increase the content of collagen in a mechanocyte and inhibit and prevent skin aging, and the cosmetic effect of the series of the skin care products is obviously higher than that of synthetic peptides. The naturalhyaluronic acid in the skin care products can obviously increase the permeability of an arterial wall, and improve the adaptability of skin to external environmental changes.

A waterproof slide fastener is provided. A pair of tapes has coupling elements attached thereto. A coating of polymeric material is provided on at least one surface of the tape and extends continuously therealong. The coating includes in cross-section a fin with a bulbous region. The coating is not extendable beyond the coupling elements when the slide fastener is in an open arrangement.

The invention relates to the technical field of fertilizer, in particular to a biological selenium-rich fertilizer agent and a preparation method thereof, specifically a selenium-rich fertilizer agent of modified rare earths containing sodium selenite and complex rare earths. The biological selenium-rich fertilizer agent is prepared from the following raw materials proportioning according to parts by weight, wherein the ratio of sodium selenite to complex rare earths is 10-20 to 80-90. The invention has scientific and reasonable prescription, simple and convenient production and use methods, low cost, safe and efficient performances. Tests show that the sodium selenite is absorbed, transferred and synthesized through crops, and most selenium is enriched in the rootstock, branches and leaves and fruits of the crops as organic compounds containing selenomethionine. The content of biologically organic selenium in the fruits or vegetable of the crops can be increased by 5-20 times, thereby increasing the contents of various amino acids, improving the yield, quality and disease resistance of crops. Selenium required to human body can be complemented by having selenium-rich farm products so as to prevent diseases, strengthen the body and have good health and long life. The biological selenium-rich fertilizer agent and the preparation method thereof is applied to popularizing and applying in broad rural areas, and have considerable market foreground.

A process is disclosed for shut-down of a membrane separation zone comprising a non-permeate side and a permeate side and processing a feed stream comprising a non-permeable component, a less-readily permeable, condensable component, and a readily permeable component. When the feed stream is not passed to the membrane separation zone, a purge stream is passed to the non-permeate side of the membrane separation to remove a residual gas stream and thereby prevent condensation of the less-readily permeable, condensable component upon depressurization and / or cooling of the membrane separation zone. This purge stream is provided by taking a feed stream, lowering its pressure which leads to cooling and then passing the cooled stream through a gas-liquid separator to removed condensed liquids. The need is reduced for oversizing membrane system which reduces treating costs and prevents permeate damage to membrane surfaces caused by condensation of less-readily permeable, condensable components such as C6+ hydrocarbons.

The invention discloses a method for detecting salmonella and staphylococcus aureus in food simultaneously. The method includes the following steps: 1), diluting a to-be-tested food sample according to GB4789 to obtain sample homogenate of 1:10, adding 50-65wt% of nitrilotriacetic acid solution into the sample homogenate according to the volume ratio of the sample homogenate to the nitrilotriacetic acid solution being (5-7):1, vibrating the mixture, adding phosphate buffer solution or 0.05% tween-20 contained phosphate buffer solution, performing centrifugal layering, and discarding an upper layer; 2), mixing a sample obtained after processing of the step 1) with immunomagnetic beads, vibrating the mixture, subjecting the mixture to standing and layering on a magnetic frame, discarding an upper layer, and washing a lower layer of the sample, wherein the immunomagnetic beads are obtained by modifying salmonella and staphylococcus aureus antibodies, which are labeled by magnetic bead coupled biotin, by streptavidin; 3), adding the phosphate buffer solution to the washed sample, vibrating the mixture, applying the mixture to an LB plate, and performing cultivation and observation. The method is simple and convenient to operate, accurate, efficient and low in cost, two target bacteria are enriched, and detection time can be shorten from 72h to 25h.

An image processing apparatus comprising a data processing unit; a first interface unit, having a plurality of logical channels, adapted to connect with an external processing apparatus; a second interface unit, compliant with a same communication standard as the first interface unit and having a plurality of logical channels with a different configuration from the first interface unit, adapted to connect with the data processing unit; a control unit adapted to control overall operation of the image processing apparatus and data transfer between the first interface unit and the second interface unit; a power control unit adapted to control turning ON / OFF power supply to the data processing unit; and a signal line connected to the data processing unit, with which the power control unit controls the data processing unit to turn on when the data processing unit is turned off and is not provided with an automatic power resume feature.

The invention belongs to the petroleum exploitation field and provides a well washing device which can seal the annular space between the oil pipe and the casing and avoid the well washing water from polluting the oil layer. The sealing well washing device comprises an eccentric well washing valve and a leather cup packer; the leather cup packer is arranged on the oil pipe under the eccentric well washing valve; the leather cup packer divides the annular casing space between the oil and the casing into an upper part and a lower part; the eccentric well washing valve is provided with a pressure switch device used for controlling the conduction and closing of the annular casing space and the space inside the oil pipe. The well washing device avoids the well washing water from contacting with the oil layer while satisfying the well washing requirement of the pumping unit production well, maintains the porosity and permeability of the production layer without affecting the yield of the crude oil. The technical proposal provided by the invention is adopted so that the water consumption is less. Under the same condition, if the general well washing method is adopted, the water consumption is 23 cubic meters in volume and the time is 4-5 hours. If the technical proposal of the well washing device is adopted, the water consumption is only 5 cubic meters in volume and the time is 90 minutes.

The invention discloses a solution for a facial mask for whitening faces and removing spots and a preparation method thereof. The solution contains traditional Chinese medicinal active components, isa traditional Chinese medicinal extraction solution of conic gymnadenia rhizome, ginseng flower, sweetacacia, honeysuckle, rose and chrysanthemum, and contains auxiliary materials including collagen peptide, water soluble azone, chitin, 1,3- butanediol, droxyethylcellulose and rose water. The inhibiting rate of the traditional Chinese medicinal composition for tyrosinase as an activating enzyme ofmelanin cells is as high as 94.3%; meanwhile, the traditional Chinese medicinal composition has the functions of promoting blood circulation by removing blood stasis, clearing away heat and toxic material and stimulating the metabolism of skin. A facial mask carrier is a conducting water soluble substrate and has good osmotic performance and moist-keeping performance under the condition of depreciating the collagen peptide of a special osmotic agent. Proved by a clinical test, the facial mask made of the traditional Chinese medicinal solution for whitening the faces and removing the spots caneffectively solve skin problems due to the pigmentation of chloasma, papilionaceous spots, age pigment and the like.

An improved system and method is disclosed for expanding a fluid permeable tubular downhole in an open hole completion. A high quality borehole is first drilled using a bottomhole assembly having a long gauge bit and a short bit-to-bend ratio. A fluid-permeable tubular is then inserted into an open-hole portion of the wellbore and preferably expanded in place. The expandable tubular may include an external filtering medium. Hydrocarbons may pass from the formation through the expanded fluid permeable tubular and into the borehole, to be recovered.

The invention provides a method for preparing a carbon nanotube film by removing residual dispersant by alkali treatment, which is characterized by comprises the following steps: after forming a carbon nanotube film on a substrate by the filtering method, soaking the carbon nanotube film in a sodium hydroxide solution for a period of time so that dispersant is chemically degraded, soaking the carbon nanotube film with deionized water and flushing the soaked carbon nanotube film to remove the dispersant scraps after degrading. The alkali treatment for removing the dispersant has the characteristic of mild conditions, thus having no damage the carbon nanotube film and the flexible substrate; the alkali treatment can effectively remove the dispersant, greatly enhance the conductivity of the film, and easily and efficiently manufacture flexible low-resistance high-transmittance single-wall carbon nanotube films on the premise of keeping the flexibility and permeability of the film. In addition, the alkali treatment for removing the dispersant can not introduce impurities, so that the treated film has high stability.

In an apparatus for the production of a nonwoven web, structure, or article using a nonwovens process in combination with a transfer belt which includes conductive material so as to dissipate static electric charge whilst maintaining a desired air permeability;

A polymer membrane for water treatment, characterized in comprising a hollow fiber membrane having a self-supporting design composed of the substantially single principal structural material, with an outer diameter of 3.6 mm to 10 mm and a ratio of outer diameter to thickness, SDR, of 3.6 to 34.

Disclosed is a sanitary napkin which is allowed to quickly absorb menstrual blood and also effective in preventing absorbed menstrual blood from returning to the skin-side surface under pressure and in concealing the color of absorbed menstrual blood from the outside. Between a liquid absorbent layer and a topsheet formed of a resin film having a large number of liquid passage apertures, there is disposed a large number of barrier members having a small width. The barrier members are strips formed of a resin film, and gaps are left between adjacent barrier members. After passing through the liquid passage apertures of the topsheet, menstrual blood tends to be absorbed by the liquid absorbent layer through the gaps. The barrier members also function to prevent liquid return and conceal the color of menstrual blood.

The invention discloses a high-yield and high-survival rate citrus planting method and belongs to the technical field of agricultural planting. The planting method includes the procedures of citrus seedling selection, soil preparation, seedling planting, topdressing after planting, treatment after harvesting of citrus trees and the like. In the procedures, self-made root-inducing sterilizing solution is adopted to treat the root systems of seedlings, a soil improvement agent is used for improving the soil environment of planting of the citrus trees, a planting fertilizer serves as a base fertilizer of the citrus trees, and a soil conditioner is adopted to improve the soil properties after planting. The planting method provided by the invention is scientific, reasonable, simple and easy to implement, and management is convenient; fertilizers used during planting are rich in nutrition, no chemical additive exists, pollution to the soil and the citrus trees is avoided, and safety and reliability are achieved; and the survival rate of the citrus trees during planting is high, the fruit output is high, fruit bearing is stable, and the social benefits, economic benefits and ecological benefits are remarkable.

The invention provides a dendritic branched molecular modified separation membrane and a preparation method thereof, a composite separation membrane and application of the dendritic branched molecularmodified separation membrane and composite separation membrane, and relates to the technical field of fluid separation. The dendritic branched molecular modified separation membrane comprises separation membranes, wherein modified membranes are formed on the membrane surfaces and / or hole walls of inner holes of the separation membranes, and the modified membranes are mainly prepared from dendritic branched molecules. The provided dendritic branched molecular modified separation membrane has the advantages that the modified membranes mainly composed of the dendritic branched molecules are formed on the membrane surfaces and / or hole walls of inner holes of the separation membranes to effectively regulate the surface structures and / or inner structures of the separation membranes, be conductive to maximizing the balance between the permeability and the selectivity, and increase the permeation flux.

The invention relates to a magnesium-iron-carbon brick used for a vanadium-extracting converter and a preparation method thereof, and belongs to the technical field of refractory materials. The brick comprises, by weight, 62-84% of fused magnesite clinker, 10-18% of flaky graphite, 5-12% of iron powder, 1-3% of netted fixed carbon and 0-5% of an anti-oxidant. The preparation method comprises (1) a step of mixing the fused magnesite clinker, the flaky graphite, the iron powder and an organic binding agent, adding or not adding the anti-oxidant, and mixing uniformly to obtain a mixture; (2) a step of subjecting the mixture to compression moulding under a pressure of 200-250 MPa to prepare an unburned brick; and (3) a step of subjecting the unburned brick to heat treatment at 150-250 DEG C for 12-32 h to obtain the magnesium-iron-carbon brick. The brick provided by the invention has good practical performances and the simple preparation method, and has a good application prospect.

An improved system and method is disclosed for expanding a fluid permeable tubular downhole in an open hole completion. A high quality borehole is first drilled using a bottomhole assembly having a long gauge bit and a short bit-to-bend ratio. A fluid-permeable tubular is then inserted into an open-hole portion of the wellbore and preferably expanded in place. The expandable tubular may include an external filtering medium. Hydrocarbons may pass from the formation through the expanded fluid permeable tubular and into the borehole, to be recovered.

A method is for use with subterranean formations, such as oil and / or gas reservoirs. In some examples (e.g., production examples), the method improves the production from that formation. Some of the examples of the method describe selecting both an exertive force (e.g., a pressure) to apply at a wellbore, but together with a drawdown pressure at the wellbore to modify operations (e.g., improve production) at that subterranean formation. The selection of one or both of the exertive force and drawdown pressure may be based on the downhole environment at that wellbore, which can include the porosity and / or permeability of a near-wellbore formation radially surrounding a wellbore. The exertive force and drawdown pressure may be specifically selected to modify the porosity and / or permeability of the near-wellbore formation.