55results about How to "Change selectivity" patented technology

The invention provides a nonstandard size cargo warehouse location matching management system comprising a cargo measurement integrated device which is used for measuring size and weight data of a cargo; a nonstandard size cargo warehouse location matching module which is used for automatically matching an appropriate warehouse location for the cargo according to cargo specification attribute values indicating size and weight of the cargo, a warehouse location bearable weight attribute value and a warehouse location accommodation size attribute value; a warehousing cargo identity identification module which is used for generating an information bar code for identifying a unique identity of the warehousing cargo on the basis of the appropriate warehouse location matched for the cargo; a tag generation module which is used for generating a tag with the information bar code for the cargo; and a warehouse outgoing and warehousing registration management module which is used for acquiring the information bar code via scanning the tag and registering warehousing and warehouse outgoing information for the cargo according to the information bar code. A full-automation warehouse location matching operation is realized, and fully computerized management of nonstandard size cargos is realized by utilizing means like the electronic tag.

The invention relates to a bionic detection device and method for electronic nose time-space smell information. A gas sensing array and a bionic air chamber are constructed in conjunction with a temperature modulation technology and a film retardation technology, and smell information data of various substances to be identified are acquired to be identified in a classified way through a subsequent mode identification algorithm. The method comprises the following steps: changing the sensitivity and selectivity of a sensor specific to different smell components through the temperature modulation technology, forming a scanning response process specific to different components of complex smell, and acquiring rich time sequence signals of different sensors in the array; setting different breathable films / semi-breathable films in an air path, simulating biological nasal cavity and mucus functions according to the characteristic of difference of diffusion transmission rates of various gas components, and acquiring the difference through the sensors distributed at different positions, namely, spatial information reflecting air chamber spreading of the smell. By adopting the method, the time-space information of the complex gas components is acquired, and a signal foundation is laid for fine identification of complex smell.

A catalyst for preparing distillate oil co-production high alcohol with synthesis gas consists of active metal and a porous carbon material carrier, wherein the weight percentage of the active ingredient is 5-20%, and the weight percentage of the porous carbon material carrier is 80-95%. The catalyst is high in activity, selectivity of a product is easy to modulate, the product is higher in stability, and a preparation method has the advantages of simplicity and good practicability.

A method of treating cancer, inflammatory disease or an infectious disease or condition in a subject in need of such treatment is disclosed. The method comprises administering to a subject an effective amount of a manzamine, or a rationally modified manzamine derivative or analog or an optical isomer or racemate or tautomer thereof or a pharmaceutically acceptable salt or prodrug thereof generated through optimized fermentation of a Micromonospora sp., extraction from sponges and then modified through semisynthesis.

The invention relates to a pretreatment solution and method for stabilization of a weathering steel surface rust layer in industrial atmospheric environment, and belongs to the technical field of metal corrosion and protection. The technical problems that different pretreatment solutions for corrosion prevention are not designed according to industrial atmospheric corrosion environment and marineatmospheric corrosion environment through the rust layer stabilization technology in the prior art separately are solved. The pretreatment solution for stabilization of the weathering steel surface rust layer comprises, by mass, 0.5%-2% of Cr(SO4)3, 0.3%-1.2% of FeSO4, 0.1%-0.6% of CuSO4, 0.3%-1.2% of NaHSO3, 0.2%-1.0% of NiSO4 and the balance H2O. According to the pretreatment solution and methodprovided by the invention, the stabilization of the weathering steel surface rust layer in the industrial atmospheric environment is achieved, and the severe corrosion problem of weathering steel isavoided; and the non-corrosive storage of the weathering steel in China is ensured.

The invention belongs to the field of material preparation and discloses a method for preparing a hafnium oxide based ferroelectric film by adopting reaction magnetron sputtering. The method comprisesthe following steps of: firstly removing residual impurities and dirt on the surface by adopting a standard RCA washing process; subsequently, by taking metallic hafnium and a doped single metal or nonmetal as a target material, depositing an amorphous hafnium oxide based film in a mixed atmosphere of Ar and O2 by adopting reaction magnetron sputtering; and afterwards annealing and crystalizing the deposited film to obtain the hafnium oxide based ferroelectric film which is of an orthorhombic-phase Pca21 spatial group crystal structure. The method for preparing the hafnium oxide based ferroelectric film by adopting reaction magnetron sputtering disclosed by the invention has the advantages that the deposition speed is high; the temperature of base materials is low; damages of the film layer are small; the film and a substrate are combined well; the film is high in purity, good in compactness and good in film formation uniformity; a sputtering power supply is flexible to select; the doped elements are flexible and versified in selection; cooling of the target material has no special requirements; the process is good in repeatability; the film growth conditions are easy to control;and the method can easily realize industrialization.

Disclosed is an iodine-based etching solution for etching a material wherein palladium and gold coexist. This etching solution contains at least one additive selected from the group consisting of nitrogen-containing five-membered ring compounds, alcohol compounds, amide compounds, ketone compounds, thiocyanic acid compounds, amine compounds and imide compounds. The etching rate ratio between palladium and gold (etching rate of palladium / etching rate of gold) is not less than 1.

The invention relates to a preparation method of an electrode for CO2 electrochemical reduction and the electrode and application thereof. The preparation method comprises the steps that firstly, impurity removal treatment is conducted to a substrate material; secondly, the substrate material is soaked in oxidizing chemical treatment liquid to obtain an electrode precursor with the surface being of a nanometer wire structure; and thirdly, the electrode precursor is subjected to electrochemical reduction treatment to obtain the electrode with a nanometer wire structure layer being attached to the surface of the electrode. According to the preparation method of the electrode for CO2 electrochemical reduction and the electrode and application thereof, compared with an existing bulk phase metal electrode preparation technology, the electrode can provide more active sites for an electrochemical reduction reaction of CO2, and the yield of a target product is improved; and the surface roughness of the nanometer wire structure layer attached to the surface of the electrode is high and changes the bonding energy between the intermediate product CO* and the electrode surface of key steps ofan ERC reaction, the subsequent reaction course of CO* is adjusted and changed, and selectivity of the target product is changed accordingly.

The invention discloses a processing method of nylon silk curtain, comprising: weave, processed nylon threads are weaving into white stock of curtain by weaving machine; dyeing, dyeing the weaved white stocks under normal temperature and pressure; afterprocessing, weaved products that needed afterprocessing are processed patterns by embroidery, flocking, or gold stamping; needlework, tailor and needlework are carried out the dyed and afterprocessed products. Organzine of the products manufactured by this process is nylon silk while tram silk is nylon silk or colorful nylon monofilament, and patterns are embroidered on products. Said products are in the characterized in light, poromeric, low price, attractive and suitable for family.

The invention provides a method for purifying ursodeoxycholic acid by a mixed solvent, which comprises three steps of preparing the mixed solvent, washing a cholic acid mixture and drying to obtain the ursodeoxycholic acid. The method is characterized by using the mixed solvent prepared from 1-80 parts of small molecule alcohol and 99-20 parts of small molecule ester by weight. The mixed solvent can selectively dissolve impurities of chenodeoxycholic acid, and the like in the cholic acid mixture and reserve the ursodeoxycholic acid. The mixed solvent not only reserves strong dissolving capacity of alcohol on the chenodeoxycholic acid, but also reserves the characteristic of ester for selectively dissolving the chenodeoxycholic acid. Under the premise of the same production capacity, the method for purifying the ursodeoxycholic acid of the invention can obviously reduce the consumption of organic solvent, saves the energy consumption of solvent recovery, and is suitable for preparing high purity ursodeoxycholic acid.

A process and catalyst for improving the yield of propylene from residual oil feedstock includes obtaining residual oil feedstock from a vacuum distillation tower. The residual oil feedstock has contaminant metals such as sodium or vanadium. The residual oil feedstock is contacted with a cracking catalyst in a catalytic cracking zone to make products. A ZSM-5 zeolite, a binder, a filler and a metal trap are components of the cracking catalyst. The metal trap has a trapping agent in an outer shell of the catalyst, a trapping agent in the ZSM-5 binder or combinations thereof. After reacting, the cracking catalyst is separated from the products in a separator zone, then regenerated by combusting coke deposited on a surface of the cracking catalyst in an oxygen-containing environment. The cracking catalyst is returned to the catalytic cracking zone. The catalyst with the metal trap is also disclosed.

The invention discloses a nanometer porous zinc electrode for electrochemical reduction of carbon dioxide, and a preparation method and application thereof. The nanometer porous zinc electrode is composed of a substrate layer, a Zn electrodeposited layer on the outer surface of the substrate layer and a Zn catalyst nanolayer formed on the surface of the Zn electrodeposited layer, wherein the Zn catalyst nanolayer of the electrode is composed of Zn nanoparticles with particle sizes of 1 to 300 nm; the Zn catalyst nanolayer of the electrode contains pore channels with diameters of 1 to 300 nm and has porosity of 2 to 15%; the Zn electrodeposited layer has a thickness of 500 nm to 0.05 mm; and the Zn catalyst nanolayer has a thickness of 100 to 500 nm. According to the invention, the Zn nanoparticles with abundant marginal active sites are prepared through electrodeposition on a substrate, heat treatment and electrochemical reduction, so the electrode has substantially improved specific surface area and active area and is enhanced in Faraday efficiency in electrochemical reduction of carbon dioxide into formic acid.

The present invention relates to preparation process of counterpoison for protecting Co-Mo catalyst for the sulfur resisting conversion of CO. The preparation process includes soaking the active carrier gamma-Al2O3 in the immersion liquid with ammonium molybdate in 7+ / -0.1 wt%, soluble cobalt salt in 1.2+ / -0.1 % accounting in CoO, redox matter in 1-15 wt%, and ammonia water in 1-5 wt%, and stoving after soaking. The counterpoison can protect the activity of Co-Mo catalyst for the sulfur resisting conversion of CO to ensure the normal operation of the catalyst.

The invention discloses a doxorubicin hydrochloride self-assembled polymer nanoparticle which is prepared from doxorubicin hydrochloride and an amphipathic high-molecular polymer PLGA (Polylactic-co-Glycolic Acid), wherein the PLGA is formed by two monomers, namely lactic acid (LA) and glycolic acid (GA). The preparation method comprises the following steps: 1) dissolving a drug doxorubicin hydrochloride into a polar organic solvent A so as to obtain a doxorubicin hydrochloride solution; 2) dissolving the PLGA into a polar organic solvent B so as to obtain a PLGA solution; 3) uniformly mixing the doxorubicin hydrochloride solution with the PLGA solution so as to obtain an eutectic solution, dripping the eutectic solution into an aqueous phase under the stirring condition, continuously stirring, and volatilizing the organic solvent; and 4) centrifuging the completely volatilized solution at a high speed by using a centrifugal machine, and collecting the precipitate, thereby obtaining the doxorubicin hydrochloride self-assembled polymer nanoparticle. The prepared product can achieve the effects of reducing the drug toxicity, reducing the administration frequency, improving the drug stability, delaying in-vivo release time of the drug, reducing adverse reactions of the drug, improving the bioavailability and efficacy of the drug and achieving excellent treatment effects.

The invention relates to the field of biotechnology, and relates to a short-chain dehydrogenase mutant and the use thereof. The mutant is obtained by mutation of a wild type of a plurality of short-chain dehydrogenases. The invention specifically relates to the short-chain dehydrogenase mutant, a preparation method thereof, and a method for preparing an optically active phenylethyl alcohol derivative by reduction of an acetophenone-derived compound using the short-chain dehydrogenase mutant.

There is provided a process for converting methanol and / or dimethyl ether to a product containing C2 to C4 olefins which comprises the step of contacting a reaction mixture which contains methanol and / or dimethyl ether and at least 10 wt % of a polymethylbenzene component selected from trimethylbenzenes, tetramethylbenzenes and mixtures thereof with a catalyst comprising a porous crystalline material. The contacting step is conducted under conversion conditions including a temperature of about 250° C. to about 500° C. and a methanol and / or dimethyl ether partial pressure of about 5 to about 250 psia (35 to 1725 kPa). The porous crystalline material used in the catalyst has a pore size greater than the critical diameter of the aromatic compound and a Diffusion Parameter for 2,2-dimethylbutane of at least 500 sec-1 when measured at a temperature of 120° C. and a 2,2-dimethylbutane pressure of 60 torr (8 kPa).

The present invention relates to a method for separating and purifying natural product by using three-phase counter-current chromatography. Sad method is characterized by that in the immobile phase of conventional counter-current chromatography a solid separation medium-microsphere can be added so as to form a three-phase separation system including liquid immobile phase, solid immobile phase and liquid mobile phase, so that the counter-current chromatography and column chromatography can be combined into one body, therefore the separation and purification efficiency of natural product can be greatly raised.

The invention discloses a method for catalyzing selective hydrogenation of 1,3-butadiene by using a CuPdPt catalyst, and belongs to the technical field of chemistry and chemical engineering. The method comprises the following steps: putting the CuPdPt catalyst into a tubular reactor, then raising the temperature of a catalyst bed to a certain temperature, then introducing a mixed gas of 1,3-butadiene and hydrogen into the reactor, adjusting the reaction conditions to a certain pressure and a certain airspeed, and carrying out a reaction. The CuPdPt catalyst is different from traditional supported catalysts, and is characterized in that the high-activity and high-stability supported CuPdPt catalyst for selective hydrogenation of 1,3-butadiene is prepared by adjusting the contents of metallic copper, palladium and platinum in the catalyst and the content of TiO2@C. When the catalyst is used for the selective hydrogenation reaction of 1,3-butadiene, the content of 1,3-butadiene in the product is lower than 670 ppb, and the content of butane is lower than 1.5%;and the catalyst still maintains a good catalytic activity after being continuously operated for 150 h.

The invention belongs to the technical field of electrocatalytic carbon dioxide reduction, and particularly relates to a catalyst precursor halogen-doped basic copper chloride compound for electrocatalytic carbon dioxide reduction reaction as well as a preparation method and application thereof. The halogen-doped basic copper chloride compound is prepared by a sol-gel method, halogen is bromine oriodine, and the content is 1%-20%. The prepared halogen-doped basic copper chloride can be used as a precursor of an electrocatalytic carbon dioxide reduction reaction catalyst for preparing an electrocatalytic carbon dioxide reduction reaction catalyst electrode; wherein the halogen doping can promote the formation of specific surface micro-morphology and structure of the catalyst precursor in the catalyst activation process, and regulate and control the catalyst structure, thereby regulating and controlling the catalytic reaction path and changing the catalyst selectivity. The sol-gel method is simple in process, can realize high-selectivity electrocatalytic carbon dioxide reduction to generate methane or ethylene, and has a good application prospect in the field of electrocatalytic carbon dioxide reduction.

The invention provides a carbon dioxide hydrogenation catalyst and a preparation method and application thereof, the catalyst is a Pd-doped metal oxide solid solution, the general formula of the metal oxide solid solution is ZnxZr1-xO, and x is 0.13-0.5. The catalyst has the characteristics of high activity, high methanol selectivity and long-time stable operation at relatively high temperature and pressure, and provides a wide prospect for subsequent industrial application and a subsequent conversion process of coupled methanol.

The invention relates to a nanometer array electrode used for CO2 electrochemical reduction, and preparation thereof. The nanometer array electrode is prepared through electrochemical anodic oxidationone-step method; on the surface of the electrode, catalytic particles are distributed in nanometer arrays. The preparation method of the electrode comprises following steps: firstly, a substrate material is subjected to oil removing and impurity removing processing; the substrate material is immersed in an anodic oxidation containing a cationic surfactant for electrochemical anodic oxidation processing so as to obtain the modified electrode with nanometer arrays on the surface. The characteristics are that: the nanometer array modified metal electrode is prepared in one step, preparation period is shortened; the catalyst diameter and length in the electrode nanometer arrays can be flexibly regulated and controlled through adjusting anodic oxidation parameters, and requirements of carbon dioxide electrochemical reduction technology on enlarging of electrode reaction area are satisfied.

The present invention relates to a method of altering the sensitivity and / or selectivity of a chemiresistor sensor, to a sensor and a sensor array produced by such method.

The invention discloses a route attenuation-based inter-communication station optical cable route optimal route selection system. The system includes a database management module, a whole network topological graph drawing module, a route analysis module and an optimal route selection module. With the route attenuation-based inter-communication station optical cable routing optimal route selection system of the invention adopted, the problems of time-consuming and labor-consuming properties and easiness in making mistakes in selection of a large number of manually-maintained optical cable routes under a traditional condition can be solved, and the complexity and error rate of manual operation can be greatly decreased, and work efficiency can be effectively improved, and time cost can be reduced; and optical cable attenuation factors are introduced, and therefore, the communication quality and speed of an electric power communication network can be greatly improved, and load in the network can be balanced. The system is of great significance in promoting the research and development of the management of the electric power communication network.

The invention relates to a nitrogen-doped carbon supported tin and tin oxide nano composite material as well as preparation and application thereof. A preparation method of the composite material specifically comprises the following steps: (1) weighing SnCl2 and NH4F, dissolving the components into water, further pouring the solution into a reaction container, vertically putting pretreated carboncloth into the container of the reaction container, performing a hydrothermal reaction, performing cooling, taking out the carbon cloth, performing cleaning, and performing drying; (2) weighing dopamine, dissolving the dopamine in a Tris buffer, further vertically suspending the prepared carbon cloth loaded with a Sn2O3 nano chip array material, performing a standing reaction, taking out the carbon cloth material, performing cleaning, and performing drying; and (3) performing calcining treatment on the carbon cloth which is prepared in the step (2) and has the polydopamine wrapped Sn2O3 nano chip array material, so as to obtain a target product, namely a Sn / SnO2@C nano composite material. Compared with the prior art, the nitrogen-doped carbon material into which a metal nano particle composite carbon material is introduced is applied to electrocatalytic carbon dioxide reduction, and provides a novel idea for preparation of carbon dioxide electrocatalytic reduction catalysts.

The invention discloses a non-aqueous reversed-phase chromatographic detection method of borate compounds. An organic solvent in a reversed-phase liquid phase system replaces the conventional aqueousphase, mobile phase components are all organic solvents, and the effective separation of borate compounds is realized through a conventional C18 or graphitized carbon chromatographic column in the isocratic or gradient mode. The borate compounds are pinacol borate lactone compounds which are five-membered lactone compounds obtained by condensation of monoboronic acid or substituted boronic acid and monopinacol. The method prevents the water instability of the borate compounds. Through use of different organic phase solutions as modifiers, the selectivity of different borate compounds is changed. The method can realize accurate qualitification and quantification, good peak shapes, a high separation degree, fastness, high efficiency and a stable compound separation environment.

The invention discloses a pair of graphene-based micro molecular optical tweezers. The pair of graphene-based micro molecular optical tweezers comprise a light source convergence unit and a moleculartrapping unit, the light source convergence unit is arranged above the molecular trapping unit and converges external incident light to a solution pool of the molecular trapping unit below the light source convergence unit, a to-be-detected molecular solution is placed in the solution pool of the molecular trapping unit, the trapping unit is integrated with microfluidic, and a sample is convenientto use. The invention has the following beneficial effects that high focusing of a light source is realized by utilizing excellent photoelectric characteristics of graphene, nanoscale limitation of light energy is realized by utilizing a local surface plasma optical effect of a graphene nanostructure, molecular trapping and intrinsic resonance excitation are realized at the same time, GHz intrinsic vibration of molecules can be induced, and measurement is performed by utilizing a radio frequency probe; electromagnetic waves are guided to a molecular trapping point through the graphene nanoelectrode and the external high-frequency electromagnetic waves, interaction between the external high-frequency electromagnetic waves and molecules is achieved, and the vibration characteristics of themolecules and the biological characteristics of the molecules are changed through the electromagnetic waves.

The invention relates to a method for stereo-selectively preparing ursodesoxycholic acid. The method is characterized by comprising following steps: (1) dissolving a compound represented as the formula (I) in a mixed solution consisting of an organic solvent and a stereo-selective reagent to prepare an electrolyte, wherein the compound represented as the formula (I) has a structure as follows; (2) in the presence of the stereo-selective reagent, performing current-constant reduction to the electrolyte with a current density being 75-100 A*m<-2> to obtain a solution contianign the ursodesoxycholic acid represented as the formula (II), wherein the ursodesoxycholic acid represented as the formula (II) has a structure as follows. By means of the method for stereo-selectively preparing the ursodesoxycholic acid, the ursodesoxycholic acid in high purity can be obtained. The method is high in yield, is short in preparation process, is high in efficiency, is simple in operation conditions and is free of environmental pollution.

The invention relates to a poly-alpha-olefin synthetic lubricant base oil preparation method. According to the method, by changing of an adding mode of reactants, a main catalyst and auxiliary catalysts in a reaction process, reactant 1-hexene is dropwise added into a main catalyst and auxiliary catalyst mixed solution by a constant-pressure dropping funnel, so that selectivity of different oligomerization products can be changed. In 1-hexene oligomerization reaction carried out according to the method, high catalytic activity and selectivity of oligomerization products such as heptamer are achieved, the problem of high oligomer content in 1-hexene oligomerization reaction is solved, and regulation of oligomerization product distribution and increase of effective component content of lubricant base oil are realized. In addition, since the reactant 1-hexene is dropwise added, a reaction process is mild, and the problem of failure in reaction control due to rapid reaction temperature rise caused by release of a great quantity of heat in the reaction process is avoided.