56results about How to "Maintain porosity" patented technology

The invention provides a method of adhering loose sands employing microbial mineralization, comprising the following steps: adopting peptone, beef extract and distilled water to prepare culture medium, adjusting pH value to 7.0, sterilizing and drying, inoculating Bacillus pasteurii strain to the prepared culture medium, culturing at 30 DEG C for 24-36h while keeping shaking in the oscillation frequency of 170r / min to ensure that the bacteria solution is completely muddy and the activity k of the bacteria solution is not less than 0.5mmol-min<-1>, mixing urea and calcium chloride solutions ofwhich volumes are equal, and injecting the obtained solution and the bacteria solution separately according the volume ratio of 2:1 in sands or mixing the obtained solution and the bacteria solution and injecting in sands. When the obtained solution and the bacteria solution are separately injected in sands, the bacteria solution is first injected, the mixed solution of urea and calcium chloride is then injected until the bacteria solution leaks out of the sands form top bottom, then the bacteria solution is injected until the solution leaks out and the above steps are repeated. When injectedin sands, the mixed solution is pressed in sands from bottom to top and is discharged from the top of sands. The adhered sand bodies have environmental friend property, simple process and low cost, and the compressive strength can be up to about 2MPa.

Sound absorbing / sound blocking products, including trim products formed from a porous fibrous layer backed by a sound absorbing layer and a sound blocking layer for use within vehicles, and methods of making same, are provided. A porous fibrous layer structure including a fibrous layer backing is heated to achieve a fluid or semi-fluid state and then subjected to vacuum to draw air through the fibrous layer backing to create a porous structure. A layer of sound absorbing and a layer of sound blocking material may be applied to the porous fibrous layer backing to provide improved acoustic properties. An underlayment may further be included to provide selected areas of increased thickness and provide tailoring of sound attenuation.

Light weight acoustic carpet including porous carpeting backed by a primary sound reducing layer and localized secondary insulators for use within vehicles, and methods of making same, are provided. A porous carpet structure including a carpet backing is heated to achieve a fluid or semi-fluid state and then subjected to intense vacuum to draw air through the carpet backing to create a porous structure. A layer of sound absorbing or insulating material may be applied to the porous carpet structure to provide improved acoustic properties. Secondary sound reducing absorbers / insulators may further be included as part of the molding process to provide selected areas of increased thickness and provide tailoring of sound attenuation.

A porous three-dimensional tissue repair matrix is provided which is biodegradable. The matrix is preferably formed from mineralized collagen where the mineral comprises particulate calcium phosphate immobilized in the matrix.

Sound absorbing / sound blocking products, including trim products formed from a porous fibrous layer backed by a sound absorbing layer and a sound blocking layer for use within vehicles, and methods of making same, are provided. A porous fibrous layer structure including a fibrous layer backing is heated to achieve a fluid or semi-fluid state and then subjected to vacuum to draw air through the fibrous layer backing to create a porous structure. A layer of sound absorbing and a layer of sound blocking material may be applied to the porous fibrous layer backing to provide improved acoustic properties. An underlayment may further be included to provide selected areas of increased thickness and provide tailoring of sound attenuation.

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.

A method for superconductingly connecting two or more wires (1, 2), each comprising at least one filament (3a-3d) that contains MgB2 or a mixture of Mg and B, wherein a superconducting connection is realized through exposed end regions (4a) of the filaments (3a-3d) via an MgB2 matrix, is characterized in that a bulk boron powder (4) is provided into which the exposed end regions (4a) of the filaments (3a-3d) of the wires (1, 2) project, the boron of the bulk boron powder (4) being present in amorphous modification. The bulk powder (4) is then compacted together with the projecting exposed end regions (4a) of the filaments (3a, 3b) to form a compressed element (8) and the compressed element (8) is infiltrated with molten magnesium (10) from the surface (13) of the compressed element (8). The method improves the quality, in particular, the current-carrying capacity and the critical magnetic field strength of a superconducting connection of MgB2 superconducting wires.

Light-emitting devices are prepared by coating a porous substrate using a polymer-assisted deposition process. Solutions of metal precursor and soluble polymers having binding properties for metal precursor were coated onto porous substrates. The coated substrates were heated at high temperatures under a suitable atmosphere. The result was a substrate with a conformal coating that did not substantially block the pores of the substrate.

The invention provides a preparation method for suspended color silica particles used for toothpaste. The method comprises the following steps: (1) adding dilute sulphuric acid into a reaction tank and then carrying out stirring, and adding PEG and an aqueous sodium dodecyl sulfonate solution at the same time; (2) adding a water glass solution into the reaction tank, carrying out neutralization reaction under stirring, adding a food-grade pigment solution when a pH value of a material system reaches 3.0 to 4.0, and controlling the final pH value of the reaction to be 4.0 to 5.0; (3) continuously adding the dilute sulfuric acid into the reaction tank, carrying out uniform stirring and then adding the water glass solution, carrying out reaction under stirring, and until the material system is transfered into a gel, stopping adding of the water glass solution so as to obtain the gel; and (4) subjecting the gel to press filtration so as to obtain a gel filter cake, washing the gel filter cake so as to remove sulfate and residual PEG, and subjecting the washed gel filter cake to drying and crushing so as to obtain the silica particles. The silica particles prepared by using the method in the invention has certain hardness and small relative density, and has a suspension time of at least half an hour in a toothpaste modulation solution system.

Dry granulates comprising ordered mesoporous silica unloaded or loaded with a biologically active ingredient and optional excipients, wherein the dry granulates have a Carr index that is equal or below 25. Oral dosage forms prepared therefrom.

A system for intercepting, treating and venting of soil gas from contaminated soil includes a borehole with an open top end, a porous liner against the outer wall of the borehole and porous fill material inside the liner. The fill material can include materials to retard and degrade contaminants in the soil gas. The system can include a slotted aeration tube in the borehole, vegetation planted in the open end of the borehole, impermeable sections in liner, and impermeable ground cover around the top end of the borehole. A method for intercepting, treating and venting of soil gas from contaminated soil includes the system and pulling soil gas out the top end of the borehole with variations in atmospheric barometric pressure.

A method for manufacturing separators includes (S1) treating at least one of the laminating surfaces of two porous substrates by corona discharge and laminating the porous substrates, (S2) preparing a slurry containing inorganic particles dispersed therein and a solution of a binder polymer in a solvent, and coating the slurry on both surfaces of the laminate of the porous substrates, and (S3) delaminating the coated laminate of the porous substrates. According to the method, two separators can be simultaneously manufactured with enhanced productivity. In addition, corona discharge can reduce damage to the surfaces of the porous substrates during lamination while maintaining the porosities of the porous substrates. Therefore, excellent performance of electrochemical devices using the separators can be ensured.

The invention discloses a carbon-based ionic intercalation energy-storage electrode material and a preparation process thereof and belongs to the technical field of carbon-based electrode materials. The material is composed of ordered graphite-like micro-crystals and unordered turbostratic carbon structures, wherein typical unordered turbostratic carbon structures are arranged around ordered graphite-like micro-crystal structures. The preparation process comprises the steps of conducting a thermal polycondensation reaction at the temperature of 320-400 DEG C with coal-tar pitch or ethylene tar pitch serving as a raw material, carbonizing the pitch powder which is subjected to thermal polycondensation at the temperature of 600-900 DEG C, conducting potassium hydroxide (KOH) activation at the temperature of 600-900 DEG C, and finally obtaining the material. The material has the advantages of being simple to operate, continuous in process, good in controllability and capable of achieving large-scale production easily. The prepared carbon-based ionic intercalation energy-storage electrode material has a unique structure of ordered and unordered inlaying and is high in capacitance and high in voltage resistance.