190results about How to "Guaranteed efficient selectivity" patented technology

A method is disclosed for the recovery of an organic acid from a dilute salt solution in which the cation of the salt forms an insoluble carbonate salt. An amine and CO2 are introduced to the solution to form the insoluble carbonate salt and a complex between the acid and the amine. The acid / amine complex is thermally dissociated, or “cracked”, in the presence of a water immiscible solvent in which the amine is selectively soluble and in which the acid is not appreciably soluble. The organic acid may then be recovered from the water by any suitable means such as distillation, reactive distillation, extraction, or reactive extraction.

The invention concerns the compression, querying and updating of tree structured data. For example, but not limited to, the invention concerns a synopsis (16) of a database system that is used in the selection of the optimal execution plan (10) for a query (8). Compression is based on representing the data as a set of definition and compressing the data by consolidating the number of definitions. A selectivity estimate can be determined based on this compressed representation, including a maximum and minimum selectivity count. The invention also provides a way to update the compressed version of the tree data without uncompressing large amounts of the compressed data unnecessarily. Aspects of the invention are methods, computer systems and software for performing the invention.

The invention provides a preparation method for a print adsorbent of chitosan molecules, which relates to a preparation method for an adsorbent that can selectively remove perfluorooctane sulfonate (PFOS) in water. The preparation method adopts a molecular imprinting technique to construct a plurality of specific adsorption sites and the worthy adsorbent has remarkable selectivity adsorption to the PFOS in water. The method takes chitosan as raw material to prepare micro-cross linking chitosan beads; then the chitosan beads are printed with template molecules PFOS for 5 to 24 hours in an acid water solution, a mass ratio between the template molecules and the micro-cross linking chitosan beads is 0.005 to 0.06: 1, and reaction with a cross linker is carried out for 2 to12 hours after printing; the mass ratio between the volume of the cross linker and the micro-cross linking chitosan beads after being printed is 0.0125 to 0.119ml / g; finally, an organic solvent is used for eluting for 1 to 8 hours and the print adsorbent of chitosan molecules is obtained after freeze-drying. The adsorbent is suitable for adsorbing and removing PFOS in complicated water substances and is characterized by strong selectivity and being able to be reused.

The invention relates to a high silicon-containing waste water in an oil field reuse boiler pretreatment technology and an apparatus. The pretreatment technology comprises the following steps: adjusting the high silicon-containing waste water in the oil field and adding a reverse demulsifier; depositing the adjusted waste water, separating oil and water and removing the impurity in the waste water; adding a salt substance in the waste water after deposition treatment and performing air floatation treatment, removing an dissolved organic matter and oil, filtering the waste water after the air floatation treatment and removing suspended matters; using filtering weak acid resin for preliminarily softening the filtered waste water, reducing the concentration of high valent cationic to ppm grade, using chelate resin for deeply softening the waste water after preliminary softening, and reducing the concentration of high valent cationic to ppb grade to obtain the high silicon-containing waste water after pretreatment in the oil field. The invention also provides the high silicon-containing waste water in oil field reuse boiler pretreatment apparatus.

The invention discloses a wind farm multi-type wind driven generator arrangement optimization method based on a genetic algorithm nested in a particle swarm optimization. The genetic algorithm is used for choosing wind driven generator position. The particle swarm optimization is used for obtaining the optimal solution of the wind driven generator position type selection and the optimal solution is adopted as fitness of the wind driven generator position. The use of the generic algorithm guarantees that a feasible solution can be obtained for solving the nonlinear strong coupling optimization problem. The use of the particle swarm optimization not only guarantees that when various types of the wind driven generators have lots of parameters, and the type selection solution is obtained rapidly but also guarantees that the two algorithm are used in a nest mode, and when iteration times are too many, the calculation time is not likely to be too long. The wind driven generator position coordinate is directly encoded rather than choosing the checkerboards after the wind farm area is divided into checkerboards, and continuous search is capable of being conducted in the wind farm scope. The wind farm multi-type wind driven generator arrangement optimization method based on the genetic algorithm nested in the particle swarm optimization doesn't need to divide the wind farm into square grids, and compared with the prior art, the performance index is better, the position scheme is more accurate and the practicability is stronger.

The object of the present invention is to provide a nucleoside or a nucleotide, or a derivative thereof, which has an unnatural base. The nucleoside and others of the present invention are characterized by having a 2-amino-6-(2-thiazolyl)purin-9-yl group or a 2-amino-6-(2-oxazolyl)purin-9-yl group as a base, wherein the 4- and / or 5-position of the thiazolyl or oxazolyl group may be substituted.

The invention provides a catalyst for preparing formic acid from carbon dioxide by electroreduction and a preparation method of the catalyst, and belongs to the field of electro-catalysis. The catalyst is a chalcogen-doped metal electrocatalyst, chalcogen contains at least one of sulfur, selenium and tellurium, and metal contains at least one of indium, stannum, lead and bismuth. The preparation method comprises following steps: 1), an elementary substance of chalcogen or a compound of chalcogen is dissolved in N,N-dimethyl formamide with metal salts, a carbon material is placed, and a mixtureis transferred into a high-pressure kettle and subjected to solvent heat treatment; 2), after the solvent heat treatment, the carbon material is taken out, washed by deionized water and dried, a carbon material supported chalcogen-doped metal oxide precursor is obtained and then subjected to electroreduction, and the carbon material supported chalcogen-doped metal electrocatalyst is obtained. When applied to the reaction of preparing formic acid from carbon dioxide by electroreduction, the catalyst is high in reactivity, high in selectivity and stable in catalytic performance and maintains high formic acid selectivity in a wide current range.

A vehicle tire communication and information system for viewing air psi and other characteristics that affects psi in a tire includes un-obstructive sensors embedded in a silicon substrate and etched in a re-enforced micro-fibered material to enable excellent detection platform, sensitivity, and selectivity within the detection environment. The embedded sensors facilitate detection and communication efficiency and transforms electrical energy into acoustic energy indicative of data transmission to a wireless electronic control module, allowing a nitride membrane to march the acoustic impedance of the air inside the tire to enable pressure waves indicative of the tire pressure.

The invention relates to a phosphine oxide-modified pillar (5) arene derivative and an application thereof, belonging to the technical field of selective separation and extraction agents for thorium (IV) and uranium (VI) from rare earth elements. The phosphine oxide-modified pillar (5) arene derivative is diphenyl phosphine oxide-substituted pillar (5) arene, is used as an extraction agent for selectively separating thorium and uranium from rare earth elements, and can realize the selective separation of uranium to thorium in actinide elements to a certain extent. The extraction agent, namely the phosphine oxide-modified pillar (5) arene in the invention has the advantages of single composition, good chemical stability, simple synthesis and easiness in obtainment, and is suitable for industrial production; furthermore, the using quantity of the extraction agent is low, and the thorium and the uranium can be selectively separated from the rare earth elements under high acidity; and in addition, the extraction agent further has the advantages of high extraction speed, high phase splitting speed and the like. The product disclosed by the invention has great economic benefits and practical application prospects.

The invention discloses a rice husk cellulose adsorbent, and a preparation method and the application of the rice husk cellulose adsorbent. The technical scheme adopted by the preparation method comprises the steps of taking rice husks; putting the rice husks in a constant-temperature drying box after washing the rice husks by deionized water; drying under 40 to 60 DEG C; taking out the rice husks and smashing the rice husks into powder; treating rice husk powder by slowly adding the rice husk powder in concentrated sulfuric acid; carrying out water-bath heating treatment; washing acidized rice husk powder by sodium bicarbonate; washing the powder to be neutral by the deionized water; filtering; carrying out constant-temperature drying under 40 to 70 DEG C; grinding the powder until the grain diameter is 100 to 150 mum. The rice husk cellulose adsorbent, and the preparation method and the application of the rice husk cellulose adsorbent, disclosed by the invention, have the advantages that a functionalized adsorbent is prepared by modifying the rice husks by sulfuric acid, gallium can be adsorbed from gallium-contained solution, low cost is realized, waste is changed into wealth, the adsorption amount is large, and the like.

The invention discloses a transform domain reusing method of double selective channels based on Vector OFDM (orthogonal frequency division multiplexing). In wireless communication under a fast moving environment, information channels need to go through severe double selective fading. Signals are transmitted to a transform domain at the transmitting end to perform two-dimensional IFFT and Vector OFDM modulation, obtained time-frequency domain signals are transmitted, the Vector OFDM is used at the receiving end for demodulation, two-dimensional FFT transform returns to the transform domain, receiving signals of the transform domain equal to two-dimensional FFT products of BEM matrixes of original transmitting symbols and information channels, and transform domain signals are orthogonal during transmission of double selective information channels, so that balancing of the information channels can be achieved only by a equalizer of a single tap. In addition, a certain coding or pre-coding structure is needed for resisting information channel deep fading. The transform domain reusing method is low in processing complexity, meanwhile can obtain inherent combined multipath-doppler diversity gain of the double selective information channels, can effectively resist information fading and improves reliability of wireless communication.

The invention discloses a low-temperature jet flow plasma and monatomic catalysis coupled nitrogen fixation device and a low-temperature jet flow plasma and monatomic catalysis coupled nitrogen fixation method. The nitrogen fixation device comprises an electrochemical workstation, a plasma power supply, an H-type electrolytic tank and a jet flow plasma reactor. The method comprises: preparing a transition metal monatomic catalyst, and then preparing a working electrode of an H-type electrolytic tank; directly introducing air, nitrogen or mixed gas of oxygen and nitrogen into a jet flow plasmareactor, turning on a plasma power supply to realize stable discharge of jet flow plasma, and turning off the plasma power supply after the jet flow plasma reactor discharges for 10 minutes; respectively transferring the discharged reaction solutions into the H-type electrolytic tank, starting an electrochemical workstation, carrying out an electrochemical catalysis process for 30 minutes, and collecting the NH4<+>-containing solution after the reaction in the H-type electrolytic tank. According to the invention, the method and the device are high in efficiency and environmentally friendly, plasma discharge and electrochemical catalytic reaction are combined, and the monatomic catalyst is beneficial to improving the yield and the reaction rate of synthetic ammonia.

A method is disclosed for the recovery of an organic acid from a dilute salt solution in which the cation of the salt forms an insoluble carbonate salt. An amine and CO2 are introduced to the solution to form the insoluble carbonate salt and a complex between the acid and the amine. The acid / amine complex is thermally dissociated, or “cracked”, in the presence of a water immiscible solvent in which the amine is selectively soluble and in which the acid is not appreciably soluble. The organic acid may then be recovered from the water by any suitable means such as distillation, reactive distillation, extraction, or reactive extraction.

The invention relates to a penetrating selective plugging agent which is prepared as follows: 400 parts by weight of water is added with a main agent comprising 10-20 parts by weight of ultrafine oilwell cement and 80-100 parts by weight of superfine ore slag, 15-30 parts by weight of a tackifier, 0-2 parts by weight of a coagulation accelerator, 0-2 parts by weight of a retarder and 1-10 parts by weight of a stabilizer; and the average particle size of the main agent is 15 to 16 mum. The penetrating selective plugging agent has good stability, and is wide in adaptation range of water mineralization degree, low in viscosity, and good in pumping performance, after the penetrating selective plugging agent is squeezed into the formation, a large pore path can be selectively plugged, and the penetrating selective plugging agent may not enter medium-low permeability formation, may not damage the formation and reservoir stratum, and has good resistance to high temperature. The invention also relates to a preparation method and an application method of the penetrating selective plugging agent, a better plugging effect can be played, plugging is achieved without sealing off, and mud acid can be used for plugging releasing.

The invention discloses a denitration and dioxin removal composite catalyst applied to flue gas of a steel sintering machine and a preparation method thereof. The flue gas contains CO; the catalyst comprises a carrier, and a dioxin removing inner layer and a denitrating outer layer which are sequentially loaded onto the carrier, wherein the dioxin removing inner layer comprises a first active substance for removing dioxin; the denitrating outer layer comprises a second active substance for removing nitrogen oxide; the CO in the flue gas reacts with the second active substance and can be used as a reducing agent for removing the nitrogen oxide. The denitration and dioxin removal composite rear earth-based catalyst prepared by the preparation method provided by the invention, has greatly improved denitration performance and water and sulfur resistance under a low-temperature working condition of the steel sintering machine; the CO in the flue gas is used as the reducing agent, and NH3 isnot required to be sprayed, so that the operating cost is reduced; efficient selectivity for dioxin removal is achieved.

The invention relates to a compound method for nickel carbonoxide. It sets thermalloy or ambrose first alloy onto fixed bed reactor and is continuously pumped into carbon monoxide with catalyst. The reaction pressure is controlled from 5.0Mpa to 15.0Mpa, and temperature is controlled from 150 degree centigrade to 250 degree centigrade. Thus, the carbonylation ratio of nickel in raw material is very high. And experiment safety factor is sharply increased.

The invention relates to an antibacterial peptide with antibacterial activity separated from cow blood, a code sequence and an application thereof. The antibacterial peptide has 1 to 25 amino acid sequences in a sequence table SEQ ID NO: 1.Except for the common property of the common antibacterial peptide such as wide antibacterial spectrum, quick sterilization, high selectivity, no drug resistance generation and no teratogenic action, the antibacterial peptide also has the flowing advantages that the structure is simple; the artificial synthesis is convenient; no antigenicity exists when the antibacterial peptide is applied to mammals; the antibacterial peptide is separated from the red blood cell of the cow blood; and the red blood cell is one of animal blood components, is involved in the process of blood circulation, and has no hemolytic toxicity or low hemolysis rate. The antibacterial peptide not only can be used for preparing a medicament for treating gram positive bacteria, gram negative bacteria, and epiphyte or viral infection, but also can be applied to the fields such as milk fresh-keeping, or other food preservatives, feed mould inhibitors and the like.

The invention provides a novel environment-friendly graphene oxide film and a preparation method thereof, the preparation method comprises the following steps of: S1, mixing graphene oxide and a solvent according to a certain proportion, and performing ultrasonic treatment to obtain a graphene oxide dispersion liquid; S2, separating large-thickness graphite sheets which are not peeled off to obtain a supernatant liquid which is a thin-layer graphene sheet dispersion liquid; S3, centrifuging the thin-layer graphene sheet dispersion liquid to obtain a large-size thin-layer graphene nano sheet; S4, carrying out ultrasonic treatment to obtain a large-size thin-layer graphene nano-sheet dispersion liquid; S5, compounding the large-size thin-layer graphene nano-sheet dispersion liquid onto the surface of a high molecular polymer filter film or an inorganic filter film to form a film material with a graphene oxide separation layer. The preparation method of the novel environment-friendly graphene oxide film adopt the large-size thin-layer graphene nano sheets to prepare the graphene oxide film material, the process is simple and easy to implement and is environment-friendly, and the thickness of the film material can be directly adjusted and controlled by adjusting the usage amount of raw materials.

The present invention relates to a method for the safety certification of a digital television broadcasting program. At present, the safety certification to the program is mainly realized through the software configuration, and the security is low. The method of the present invention has the procedures that a preset legal program name is wrote in a ROM; a PST chart is abstracted, and the mapping of a program number of each program and the PID value of a PMT chart are established; a SDT chart is abstracted, and the mapping between the program number and the program name of each program; the corresponding program number of each legal program is detected; the PMT chart of the legal program is abstracted, and the audio and video PID value is decoded; a corresponding TS package of the legal program is identified, and then transmitted to the back level. The method of the present invention integrates a safety certification filter in a digital television demodulator and a decoder, while the legality of program information is checked, the cost is low, therefore ensuring that the TS stream of a flow message source decoder only contains legal contents already checked and passed.

The invention provides a supported cobalt monatomic catalyst and a preparation method and application thereof. The preparation method comprises the following steps: (1) enabling urea to be subjected to a thermal polymerization reaction to obtain graphitized carbon nitride; (2) reacting the graphitized carbon nitride obtained in the step (1) with cobalt salt to obtain a cobalt and graphitized carbon nitride compound; and (3) carrying out heat treatment on the compound obtained in the step (2) and hypophosphite to obtain the supported cobalt monatomic catalyst. The preparation method is simple, wide in raw material source and high in yield, and has a large-scale application prospect. The supported cobalt monatomic catalyst is a phosphorus-doped graphitized carbon nitride supported cobalt monatomic catalyst, has the characteristics of adjustable band gap, high catalytic activity and high selectivity, and can realize selective oxidation under photocatalysis with high conversion rate; and the catalyst is especially suitable for converting alcohol compounds into aldehyde compounds or ketone compounds through a photo-oxidation catalytic reaction.

The present invention relates to a process for enriching an iron mineral from a silicate-containing iron ore by reverse froth flotation of the ore using a collecting composition comprising: a) a compound of formula R1O-A-NH(CH2)nNH2 (I), wherein R1 is a straight or branched hydrocarbyl group with 12-15 carbon atoms, A is a group —CH2CHXCH2—, wherein X is hydrogen or a hydroxyl group, and n is a number 2-6; b) a compound of formula R2NH2 (II), where R2 is a hydrocarbyl group having 12-14 carbon atoms; c) a compound of formula R3NH2 (III), wherein R3 is a straight or branched, saturated or unsaturated hydrocarbyl group having 16-22 carbon atoms; and d) optionally a depressing agent for the iron mineral, wherein the amount of a) is at least 65% by weight, based on the total weight of a), b) and c), and at most 90% by weight, based on the total weight of a), b) and c), and wherein the weight ratio between c) and b) is 4:1 to 1:1.

The invention discloses an ECG identity recognition method based on a WT and WOA-PNN algorithm, and the method is specifically implemented according to the following steps: 1, collecting an electrocardiosignal, and carrying out the preprocessing and denoising of the electrocardiosignal, and obtaining a denoised ECG signal; step 2, positioning an R wave peak point of the denoised ECG signal in thestep 1 by adopting a wavelet positioning method; 3, determining the position of a QRS wave group through the R wave peak point obtained in the step 2, and determining the peak points, starting pointsand ending points of the P waves and the T waves; and step 4, combining the peak points, the starting points and the ending points of the QRS wave groups, the P waves and the T waves obtained in the step 2 and the step 3 to obtain a feature vector, and then performing ECG signal identification by using a WOA-PNN algorithm. According to the ECG identity recognition method based on the WT and WOA-PNN algorithms, the problem that in the existing ECG recognition process, the recognition precision of small-capacity multi-classification samples is not high is solved.

The invention provides an insect pest situation forecast system based on a single chip. The system comprises a master control mechanism, a color attracting device, an infrared geminate transistor turn taking shooting counting device, a high pressure touch out device, a sex attracting device, a data transmission and processing system and a power. Under the control of the single chip of the master control mechanism, the system provided by the invention adopts an LED color attracting lamp of the color seduction device to conduct selective rough attracting to the insects before the insects passing through the counting channel, and the infrared geminate transistor turn taking shooting counting device is used for counting the insects when the insects passing through the counting channel; sex pheromone in the sex attracting device is used for conducting single attracting to the insects after the insects passes through the counting channel; insects attracted by the sex pheromone can be touched out after passing through the high pressure touch out device; the data transmission and processing system can conduct timing data transmission and processing, so as to realize accurate, efficient, real-time and intelligent forecasting.

The invention discloses a method for optimizing the site selection and the model selection of wind driven generators suitable for a complex constraint condition. For an optimization problem of the site selection and the model selection of the wind driven generators, when nonlinear constraint conditions exist such as minimum annual power generation and shortest distance between wind driven generators, a genetic algorithm is used for site selection of the wind driven generators and a particle swarm optimization (PSO) algorithm is used for acquiring the optimal scheme of the model selection of the wind driven generators at such site. The method sets the objective function of the PSO algorithm, adds a penalty function in order to add a minimum power generation limiting condition thereto, and is in nested use with a genetic algorithm as a wind driven generator model selection optimization algorithm. In the genetic algorithm, the objective function of the genetic algorithm is set, and the penalty function is added to the shortest wind driven generator distance, that is, a safe distance limiting condition is added in order to achieve position model optimization of mixed installation of multiple models of wind driven generators in a wind power plant. The method can solve the optimization problem with the complex nonlinear constraint condition, achieves a better performance index, a more accurate model selection scheme, and better practicality.

The present invention relates to a method for nucleic acid replication and novel artificial base pairs.The method of the present invention for nucleic acid replication is characterized in that a deoxyribonucleoside 5′-triphosphate, in which the hydroxyl group of phosphoric acid at the γ-position is substituted with a group selected from the group consisting of an amino group, a methylamino group, a dimethylamino group, a mercapto group and a fluoro group, is used as a substrate during replication reaction. The novel artificial base pairs of the present invention are characterized in that 7-(2-thienyl)-imidazo[4,5-b]pyridine (Ds) or an analog thereof forms a base pair with pyrrole-2-carbaldehyde (Pa) or an analog thereof.

The invention relates to reagent for the derivatization of small molecular aldehyde substance and application thereof. The invention is characterized in that the reagent is composed of the substances in the following weight ratio: 1 - 10 percent of diphenylamine, 20 - 40 percent of 2,5-dihydroxy benzoic acid and 50 - 60 percent of alcohol. The derivative process reagent is utilized as extraction solution for liquid-phase micro-extraction (LPME), the small molecular aldehyde in the gas phase of the flue gas is directly extracted and derived through the LPME method, after the extraction is finished, the derivatization of the small molecular aldehyde substance is simultaneously finished, the solution with extracted analyte is directly dropped to the target plate of MALDI mass spectrum, the analysis is directly performed after the solution is air dried, therefore, qualitative detection or quantitative detection can be performed for the aldehyde compound, and extra matrix for the MALDI mass spectrum is not required. The invention has the advantages that the selectivity is strong and the sensitivity is high, the diction limit for formaldehyde and acrolein can reach fmol level; the preparation is simple, and the cost is low.

The invention provides an image processing method capable of real time visualization. The method comprises the following steps: a pre-filtering operation step, a scope determining step, an image processing step and a result display step. In the pre-filtering operation step, basic image information of data of a currently displayed image is read, and the basic image information is subjected to pre-filtering operation so as to generate original image information; in the scope determining step, the pixel scope of the currently displayed image is determined according to the original image information; in the image processing step, a part, being in the pixel scope of the image, of the original image information is subjected to image processing operation so as to generate a processing result; in the result display step, the processing result is directly displayed with the image pixel scope being taken into consideration, and image processing operation or processing result output operation is conducted again by returning to the image processing step according to control information. The image processing method is characterized in that a real time visualization technology is combined with an image processing algorithm, the result can be visualized in real time, image processing procedures can be displayed visually, control over the processing procedures and precision can be improved, effective selection and replacement of the image processing algorithm can be facilitated, and image processing efficiency can be improved.

The invention discloses a Candida antarctica lipase B mutant as well as a transformation method and application thereof, belonging to the technical field of bioengineering. According to the transformation method, a key locus capable of decreasing dynamics of the conformation of a pocket is found by virtue of conformational dynamics engineering of a combined pocket of CALB through molecular dynamics simulation, and an optimal mutant is designed, so that the limitation that previous enzyme EF5 only presents high enantio-selectivity at a relatively low temperature is overcome, and the optimal mutant is experimentally verified. Finally, the obtained optimal mutant D223V / A281S is used for catalyzing and preparing (R)-3-substituted glutaric acid alkyl monoester compounds, an eeR value of the optimal mutant can reach above 99% under an industrially acceptable temperature (20-55 DEG C), the yield is more than 80.0%, the space time yield can reach 107.54g.L<-1>d<-1>, the cost caused by a previous low-temperature condition is greatly lowered, the production period is shortened, and foundation is laid for the industrialization of the (R)-3-substituted glutaric acid alkyl monoester compounds.

The invention discloses a bimetal Pt-Bi catalyst preparation method which includes the steps: S1 adding Pt catalysts into glycerin reaction liquid containing auxiliaries Bi and performing catalytic oxidation on glycerinated 1, 3-dihydroxy acetone to obtain reaction liquid mixture containing bimetal Pt-Bi catalysts; S2 separating the bimetal Pt-Bi catalysts in the reaction liquid mixture and then performing calcination in inert atmosphere under the condition of 200-300 DEG C to prepare the bimetal Pt-Bi catalysts. According to the preparation method, the inactivated bimetal Pt-Bi catalysts canbe used for preparing the high-activity bimetal Pt-Bi catalysts, the prepared bimetal Pt-Bi catalysts are high in catalytic activity, and glycerinated DHA (docosahexaenoic acid) can be efficiently andselectively catalyzed and oxidized. The bimetal Pt-Bi catalysts are recycled in selective catalytic oxidation of the glycerinated 1, 3-dihydroxy acetone by calcination, the concentration and the Bi content of glycerin in the glycerin reaction liquid are kept constant, and the bimetal Pt-Bi catalysts can keep initial DHA selectivity with high glycerin transformation rate after 2-6 times of cycles.