50results about How to "Improve selectivity" patented technology

The present invention discloses fluoropolymer coated membranes and methods for making and using these membranes. The fluoropolymer coated membranes described in the current invention are prepared by coating a porous asymmetric membrane layer with a thin layer of fluoropolymer coating. The porous asymmetric membrane layer comprises an asymmetric cellulosic membrane, an asymmetric polymer membrane, or an asymmetric molecular sieve/polymer mixed matrix membrane with a low selectivity and high permeance. The fluoropolymer coating improves the selectivity of the porous asymmetric membrane layer and maintains the membrane performance with time. The fluoropolymer coated membranes are suitable for a variety of liquid, gas, and vapor separations such as desalination of water by reverse osmosis, non-aqueous liquid separation such as deep desulfurization of gasoline and diesel fuels, ethanol/water separations, pervaporation dehydration of aqueous/organic mixtures, CO₂/CH₄, CO₂/N₂, H₂/CH₄, O₂/N₂, olefin/paraffin, iso/normal paraffins separations, and other light gas mixture separations.

The manufacturing method of a semiconductor device according to the present invention comprises steps of forming a metal film, an insulating film, and an amorphous semiconductor film in sequence over a first substrate; crystallizing the metal film and the amorphous semiconductor film; forming a first semiconductor element by using the crystallized semiconductor film as an active region; attaching a support to the first semiconductor element by using an adhesive; causing separation between the metal film and the insulating film; attaching a second substrate to the separated insulating film; separating the support by removing the adhesive; forming an amorphous semiconductor film over the first semiconductor element; and forming a second semiconductor element using the amorphous semiconductor film as an active region.

Methods and apparatus of staged injection of an oxidant into a feedstream within a reactor are disclosed. The staged injection of the oxidant can better disperse the catalytic reactions throughout the catalyst bed. The staged injection of the oxidant can lower the content of carbon oxides in the reaction product stream, which can reduce energy release from the reactor.

A tunable membrane configuration for a filtration or selective fluidic isolation and recovery device includes a housing having an inlet at one end and an outlet at an opposite end with an opening extending from the inlet to the outlet. An internal support structure is maintained in the opening, and layered filtration media is carried by the internal support structure, the media separating feedwater received at the inlet into at least three separate output flows.

Method of forming flash memory device is disclosed, more particularly, method of forming self-aligned floating gate by performing Chemical Mechanical Polishing (abbreviated as "CMP") process using slurry having higher polishing selectivity to oxide films than to nitride films and slurry having higher polishing selectivity to polysilicon than to oxide films.

Disclosed herein are mixed matrix membranes which include a continuous phase organic polymer with molecular sieves interspersed therein, the molecular sieves comprising one or more zeolites having an HEU structure type; wherein the membrane exhibits a mixed matrix effect and further wherein the membrane has a N₂/CH₄ selectivity of greater than about 5, at 35° C. and a pressure of 100 psia (690 kPa). Methods for their preparation and use are also disclosed.

The present invention provides oligomeric compounds comprising at least one neutral methoxypropyl phosphonate modified internucleoside linkage. Such oligomeric compounds have one or more improved properties such as selectivity, potency, improved toxicity profile and or improved proinflammatory profile. Such oligomeric compounds have enhanced stability to exposure to base during synthesis. Certain such oligomeric compounds are useful for hybridizing to a complementary nucleic acid, including but not limited, to nucleic acids in a cell. In certain embodiments, hybridization results in modulation of the amount activity or expression of the target nucleic acid in a cell.

The invention disclosed is a method for improving the selectivity of a desired chemical reaction over an undesired chemical reaction utilizing a reactor having at least one channel having a catalyst positioned thereon and a presenting a reactant flow stream at a known flow rate and inlet temperature over the catalyst at a velocity such that a boundary layer formed thereby relative to said catalytic surface defines a thickness that is sufficiently less than the thickness of a fully developed boundary layer over said catalytic surface whereby the desired chemical reaction occurs preferentially over the undesired chemical reaction.

The present invention relates to one kind of catalyst for dehydrogenating alkyl arene to prepare alkyl alkynyl arene and aims at raising the selectivity and strength of low potassium catalyst. The technological scheme of the present invention includes replacing Portland cement in the Fe-K-Ce-Mo-Mg-Ca catalyst system with aluminate cement and adding selecting modulation agent. The catalyst system may be used in industrial production to prepare alkyl alkynyl arene.

A system and a method are provided for calculating the cetane number, pour point, cloud point, aniline point, aromaticity, and/or octane number of a crude oil and its fractions from the density and fluorescence spectroscopy of a sample of the crude oil.

There is provided an electroless plating method and device which can form a plated film having an improved uniformity of film thickness with an enhanced selectivity, while preventing the formation of fine pores in the plated film. The electroless plating method comprises, bringing a substrate into contact with an electroless plating solution to form a plated film on the surface of the substrate, and scrubbing the surface of the plated film formed or being formed on the surface of the substrate.

The invention discloses a method for preparing hydrocarbon from higher aliphatic ester by taking metal phosphide as a catalyst. The method comprises the following steps: filling the metal phosphide catalyst in a fixed bed reactor; feeding in the molar ratio of hydrogen to higher aliphatic ester of (10-500):1; under the conditions that the temperature is 250-450DEG C and H2 pressure is 0.1-8.0MPa and the weight hourly space velocity of higher aliphatic ester is 0.1-15h<-1>, generating hydrocarbon, wherein the metal phosphide catalyst takes silicon dioxide, aluminum oxide, HY molecular sieve, HZSM-5 molecular sieve, titanium dioxide-aluminum oxide composite oxide or cerium oxide-aluminum oxide composite oxide as a carrier, the active phase of hydrocarbon is phosphide of Ni, Co, Fe, Mo, W, Ni-Co, Ni-Fe, Ni-MO, Ni-W or Co-Mo, and the mass of the metal element and the mass of the phosphorus element respectively account for 30-40wt% and 1-15% of that of the catalyst. According to the invention, the adopted metal phosphide catalyst has the advantages of high activity, low cost, good application prospect and the like and does not need to use a vulcanizing agent.

A system for separating products from reactants within a reactive distillation column is revealed. Reaction products heavier than reactants are discouraged to re-enter the reaction zone by a rectifying section in between the reaction zone and the stripping section. Reaction products lighter than reactants are discouraged to re-enter the reaction zone by a stripping section in between the reaction zone and the rectifying section.

A method of forming a thin film transistor array panel includes: forming a first insulating layer on a substrate; forming an amorphous carbon layer on the first insulating layer; forming a second insulating layer on the amorphous carbon layer; forming an opening in the amorphous carbon layer by patterning the second insulating layer and the amorphous carbon layer; and forming a trench in the first insulating layer by etching the first insulating layer, the etching the first insulating layer using the amorphous carbon layer including the opening as a mask.

A method of manufacturing a semiconductor device is disclosed. A gate is formed on a semiconductor substrate. A gate oxide is formed between the gate and the semiconductor substrate. A silicon oxide liner layer is deposited on the gate and on the semiconductor substrate. A silicon nitride layer is then deposited on the silicon oxide liner layer. The silicon nitride layer is anisotropically etched by employing plasma created by using plasma source gas containing hydrogen bromide and chlorine thereby forming spacer on sidewalls of the gate. The hydrogen bromide plasma is produced at a temperature of about 50-150° C., a pressure of 5-200 mTorr, a source power of no less than 800 Watts, and a bias power of about 100-200 Watts.

A method for producing an iodine radioisotopes fraction, comprising the steps of dissolving enriched uranium targets forming a slurry, filtering the slurry, absorbing salts of iodine radioisotopes onan aluminium resin doped with silver and recovering the iodine radioisotopes fraction. The recovery of the iodine radioisotopes fraction, in particular of I-131, comprises washing the aluminium resindoped in silver using a solution of NaOH and eluting of iodine radioisotopes by a solution of thiourea, and collecting an eluate containing the iodine radioisotopes in a theourea solution.

Provided is a composition for use in fabricating a carbon molecular sieve membrane, including a fluorine-containing polymer matrix and polysilsesquioxane. The composition shows high selectivity to the gas to be separated and high separation quality by controlling the mixing ratio of the fluorine-containing polymer matrix with polysilsesquioxane as well as the type of fluorine-containing polymer matrix and polysilsesquioxane. Ancillary selective pore formation is enhanced by a so-called “autogenous fluorinated gas induced siloxane etching” (A-FISE) mechanism of fluorine-containing polymer/polysilsesquioxane blend precursors during carbonization. Therefore, it is possible to effectively separate gases having a small difference in particle size, which, otherwise, are difficult to be separated with the conventional polymer membranes.

An improved band pass filter of π-type inductor is disclosed, which utilizes the serial inductor in the π as a compensating inductor, which can lower the coupling coefficient of the band pass by adjusting the inductance ratio of the compensating inductor to that of the two parallel grounded inductors. Therefore, the coupling coefficient is lowered by adjusting the inductance of the π-type inductors, avoid noise generation, and obtain optimal band pass characteristics, while miniaturizing the filter.

Compounds of formula I

A filter with coupled resonator having a substrate; an acoustic mirror intended to support acoustic resonators, and to isolate these resonators from the substrate; a first structure with an upper resonator and a lower resonator coupled to one another through at least one layer of acoustic coupling; a second structure with an upper resonator and a lower resonator coupled to one another through at least one layer of acoustic coupling; the lower resonators of the first and second structure having the same electrodes. The first and second structures are connected via a fifth resonator for which electrodes and the piezoelectric layer of the lower resonators are of the first and second structure.

In a system and method for the reduction of nitrogen oxides in the exhaust of an internal combustion engine, the exhaust line of the internal combustion engine contains a DeNOx catalytic converter, in which the nitrogen oxides are reduced by means of hydrogen that is produced on-board the vehicle. The DeNOx catalytic converter is incorporated into a temperature-controlled heat exchanger, allowing the DeNOx catalytic converter to be operated within a desired temperature range, thereby improving the level of conversion.

The invention relates to an alpha-alumina carrier of a silver catalyst for olefin epoxidation and a preparation method thereof. The mass content of alkaline earth metals in the carrier is not more than 900ppm, and the alkaline earth metals are selected from calcium, strontium and barium. The invention also discloses the silver catalyst comprising the carrier as well as a preparation method and application thereof. By adopting the method provided by the invention, the alpha-Al2O3 carrier with better mechanical properties can be prepared as well and the crushing strength of the alpha-Al2O3 carrier is more than 30N/grain and can meet the use requirements by simultaneously controlling the content of the alkaline earth metals in the raw materials without adding alkaline earth metal compounds in the carrier preparation process; and the selectivity of the catalyst is improved when the silver catalyst prepared from the carrier provided by the invention is used for olefin epoxidation, especially for production of ethylene oxide through ethylene oxidation.

Methods of cleaning substrates and growing epitaxial silicon thereon are provided. Wafers are exposed to a plasma for a sufficient time prior to epitaxial silicon growth, in order to clean the wafers. The methods exhibit enhanced selectivity and reduced lateral growth of epitaxial silicon. The wafers may have dielectric areas that are passivated by the exposure of the wafer to a plasma.

A method of plasma etching includes an etching process that generates plasma from a process gas that includes fluorocarbon by using first high frequency power output by a first high frequency power source, and by the generated plasma, etches a low-k film with a metal-containing film as a mask. In the etching process, the first high frequency power is intermittently applied.

The invention relates to the field of aluminum cellular boards and especially relates to an aluminum cellular board rigidity testing device based on external environment simulation. A case is included. A test box is welded at a top of the case; a hydraulic telescopic rod I, a hydraulic telescopic rod III and a hydraulic telescopic rod V are installed on the top of the test box through bolts; and asqueezing plate II is mounted at output ends of the hydraulic telescopic rod I, the hydraulic telescopic rod III and the hydraulic telescopic rod V through the bolts; three partition plates are welded in the test box, a heating bin, a mounting bin, a normal-temperature bin and a refrigerating bin are formed in the test box through the three partition plates respectively, a heating plate is mounted in the heating bin through the bolts, and a refrigerating plate is mounted in the refrigerating bin through the bolts. The aluminum cellular board rigidity testing device has beneficial effects thatdifferent external temperature environments can be simulated at the same time, an aluminum cellular board rigidity test is tested by the influence of an environment temperature change, the aluminum cellular board can be detected at different temperatures at the same time, and working efficiency of rigidity detection of the used aluminum cellular board is improved.

A DNA polymerase in which a mutation is induced at a specific amino acid position to increase gene mutation specificity, a nucleic acid sequence encoding the polymerase, a vector comprising the nucleic acid sequence, and a host cell transformed with the vector are disclosed. Provided are a method for in vitro detecting one or more gene mutations or SNPs in one or more templates by using a DNA polymerase having increased gene mutation specificity, a composition for detecting a gene mutation or SNP comprising the DNA polymerase, and a PCR kit comprising said composition. Furthermore, provided are a PCR buffer composition for increasing the activity of a DNA polymerase having increased gene mutation specificity and a PCR kit for detecting a gene mutation or SNP comprising the PCR buffer composition and/or the DNA polymerase having increased gene mutation specificity.

A system for producing phenol and bisphenol A comprising: a first production unit for producing phenol comprising a decomposition reaction unit and a purification unit; a second production unit for producing bisphenol A comprising a reaction unit and a concentration unit; and a removal unit for removing methanol and acetone during the production of phenol and bisphenol A. The removal unit includes a removal column comprising an overhead purge part, a bottom recirculation part and a supply part. The supply part comprises a purification unit discharge part to supply methanol, acetone, and water discharged from the purification unit to the removal column and a concentration unit discharge part to supply phenol, acetone, and water discharged from the concentration unit to the removal column, and is provided to the midsection of the removal column.

The invention relates to a mixed-ether-based floatation agent and a preparation method thereof and belongs to the technical field of coal floatation agents. The mixed-ether-based floatation agent includes, by mass, 50-60 parts of a mixed ether, 40-50 parts of a foaming agent, and 0.1-0.2 part of a surfactant. The mixed-ether-based floatation agent can enhance hydrophobicity of weathered coal, so that weathered coal washing recovery rate is increased, washing quality is controlled, and production cost is reduced.