51results about How to "Flexible and adjustable ratio" patented technology

The invention discloses a high-dispersion Co-based bimetallic catalyst based on ZIFs and a preparation method of the high-dispersion Co-based bimetallic catalyst based on ZIFs, and belongs to the technical field of synthesis of nanometer materials and catalysts, the method ingeniously utilizes the characteristics that metal nodes in ZnCo-ZIFs are high in dispersion and have periodic pore structures; first, a second active metal salt is introduced into ZIFs pore channels through a double-solvent method; then in the high-temperature calcination process, the low-boiling-point metal Zn volatilizes and plays a fence role, the distance between the active metals is increased, Co nodes and the second active metal are subjected to in-situ reduction, and the high-dispersion Co-based bimetallic catalyst loaded on the nitrogen-doped carbon carrier is obtained. The method is simple in process and convenient to operate, the composition of the obtained high-dispersion Co-based bimetallic catalyst is flexible and adjustable, metal particles are distributed in a high-dispersion form, and the high-dispersion Co-based bimetallic catalyst has good stability and is expected to be applied to hydrogenation reaction, synthesis gas conversion, alcohol selective oxidation and other reactions.

A white LED (light-emitting diode) and a method for packaging the white LED relate to the technical field of semiconductor packaging. The white LED comprises a support, wherein a heat dissipating cup is arranged at the upper part of the support; a copper block and an electrode are arranged at the bottom of the heat dissipating cup; a blue light chip is arranged on the copper block; a lead is connected between the blue light chip and the electrode; the heat dissipating cup is internally coated with fluorescence glue which is prepared from the following raw materials: TMR-200647-380490 fluorescent powder, silicate 05742 fluorescent powder, silicate / nitride BLT-2500-AB fluorescent powder and silica gel 6551AB in a ratio of X: Y: Z: 100, wherein X ranges from 0.1 to 1, while Y ranges from 1 to 10 and Z also ranges from 1 to 10. The white LED and the method for packaging the white LED provided by the invention improve the reducibility of light emitted by the white LED and can satisfy the desired backlight of a liquid crystal television, and further are characterized by low production cost and high reliability; therefore, the white LED can be widely applied to the liquid crystal television.

The invention discloses a modification method for a cation exchange resin catalyst. The modification method comprises the steps: (1) dissolving an acidic compound in an alcoholic organic solvent, so as to prepare an alcoholic solution of the acidic compound; (2) subjecting the cation exchange resin catalyst to a reaction with the alcoholic solution of the acidic compound; and (3) drying the reaction product of the step (2). The invention further discloses a method for carrying out comprehensive utilization on an etherified C4 fraction through the modified cation exchange resin catalyst obtained by the method. The method comprises the following steps: (i) subjecting the etherified C4 fraction to a reaction with acetic acid in the presence of the catalyst, so as to obtain a crude sec-butyl acetate product containing acetic acid; (ii) subjecting water and the crude sec-butyl acetate product containing acetic acid to a hydrolysis reaction in the presence of the catalyst, and separating a mixture of sec-butyl acetate and sec-butanol from the mixture obtained from the reaction; and (iii) rectifying the mixture of sec-butyl acetate and sec-butanol, thereby obtaining sec-butyl acetate and sec-butanol products separately.

The invention discloses a ferrocenyl azophenyl photoelectric double-response polymer material for information storage and a preparation method thereof. Firstly, ferrocenecarbonyl chloride is prepared,then a methacrylic acid ferrocenyl formyloxy ethyl ester monomer is prepared by using ferrocenecarbonyl chloride, and a methacrylic acid-4'-nitryl azoaniline monomer is prepared by using 4-amino-4'-nitroazobenzene; the ferrocenyl azophenyl photoelectric double-response polymer material is prepared in combination with the two monomers. The photoelectric double-response polymer with a special function of information storage is prepared, the thermal stability of the material is good, the stimulation response phenomenon is obvious, and the photoelectric response detection is convenient.

The invention discloses a large-scale MIMO DOA estimation method based on codebook assistance, and the calculation complexity is extremely high when a traditional DOA estimation algorithm is applied to large-scale MIMO due to the fact that the antenna scale in a large-scale MIMO system is extremely large. The present invention proposes a novel frame structure for downlink transmission. Based on the frame structure, a codebook assistance algorithm is introduced into DOA estimation. Specifically, a codebook channel is fed back to the combination of a traditional MUSIC algorithm and a convex optimization algorithm, so that the computational complexity caused by increase of the array number of DOA estimation in a large-scale MIMO system is solved. Under a codebook feedback mechanism, prior information can be fully utilized to obtain a directional angle range, so that the computational complexity of DOA estimation can be obviously reduced, and the simulation result verifies the effectiveness of the algorithm.

The present invention relates to a method for preparing cyclohexanol and cyclohexyl acetate by using cyclohexene and acetic acid. The method comprises: 1, carrying out a reaction on cyclohexene and acetic acid under the action of a catalyst to obtain an acetic acid-containing cyclohexyl acetate crude product; 2, carrying out a hydrolysis reaction on water and the acetic acid-containing cyclohexyl acetate crude product, and separating the mixture of cyclohexyl acetate and cyclohexanol from the mixture obtained through the reaction; and 3, rectifying the mixture of cyclohexyl acetate and cyclohexanol so as to respectively obtain cyclohexanol and cyclohexyl acetate. With the method of the present invention, the high-purity cyclohexanol product and the high-purity cyclohexyl acetate product can be obtained, the cyclohexanol selectivity is high, the process is simple, and the production cost is greatly reduced.

A white LED (light-emitting diode) and a method for packaging the white LED relate to the technical field of semiconductor packaging. The white LED comprises a support, wherein a heat dissipating cup is arranged at the upper part of the support; a copper block and an electrode are arranged at the bottom of the heat dissipating cup; a blue light chip is arranged on the copper block; a lead is connected between the blue light chip and the electrode; the heat dissipating cup is internally coated with fluorescence glue which is prepared from the following raw materials: TMR-200647-380490 fluorescent powder, silicate 05742 fluorescent powder, silicate / nitride BLT-2500-AB fluorescent powder and silica gel 6551AB in a ratio of X: Y: Z: 100, wherein X ranges from 0.1 to 1, while Y ranges from 1 to 10 and Z also ranges from 1 to 10. The white LED and the method for packaging the white LED provided by the invention improve the reducibility of light emitted by the white LED and can satisfy the desired backlight of a liquid crystal television, and further are characterized by low production cost and high reliability; therefore, the white LED can be widely applied to the liquid crystal television.

The invention relates to a floating charger capable of pulse charging, and belongs to the technical field of electronics. The floating charger comprises a process indication unit, a parallel discharging unit, a parallel charging unit, an interface unit, a pulse unit, a dual-selection ending unit, a load unit and a trickle resistor. A charging circuit difficult to damage is achieved by a few activepieces, the parallel charging unit, the parallel discharging unit, the interface unit and the pulse unit are combined to form pulse charging of which charging and discharging are simultaneously performed and charging time is larger than discharging time, a triode in the parallel charging unit is connected in a constant-current mode and is also in constant-current charging, two modes of ending after full charging of the battery and timely ending are arranged in measure, the switching is flexible and convenient, sound is reminded after ending, and a required trickle current is provided for a charged battery by the trickle resistor. After implementing the floating charger, the charging time and charging stopping time of the charged battery can be flexibly adjusted, different types of chargedbatteries are adapted, the lifetime of the charger and the charged battery is prolonged to the greatest extent, and environmental friendliness of society is achieved.

The invention provides a solar thermal-electrical-chemical comprehensive utilization system. A first electrode of a photon-reinforced thermo-electronic emission device is attached to a heating surface of a chemical reactor; a second electrode is towards a light condensation device; electric energy converted by the photon-reinforced thermo-electronic emission device is output outwards; and thermal energy converted by the photon-reinforced thermo-electronic emission device and the heating surface of the chemical reactor drives the chemical reactor to generate a chemical product, so that the thermal energy is converted into chemical energy. According to the solar thermal-electrical-chemical comprehensive utilization system provided by the invention, loss of available energy, which is caused by direct conversion from high-grade solar energy to low-grade thermal energy, is reduced; energy utilization efficiency is improved; the grade of the thermal energy is promoted to the grade of the chemical energy; system efficiency is promoted; all-weather power supply and stable output of the electric energy are implemented; the solar thermal-electrical-chemical comprehensive utilization system can work in an electric energy stable output mode, a chemical energy output mode and an electric energy and chemical energy parallel output mode; flexible conversion of the light energy, the thermal energy, the electric energy and the chemical energy is implemented; and the solar thermal-electrical-chemical comprehensive utilization system is rich in energy supply variety and flexible and adjustable in proportion.

The invention discloses an ultrahigh speed material heating system which comprises a reaction device, a gas inlet device, a powder feeding device and a flue gas analysis device. The reaction device is connected with a high-temperature plasma generator in a sealing manner; the gas inlet device conveys gas into the high-temperature plasma generator; high temperature plasmas generated by the high-temperature plasma generator are fed into a reactor from the bottom of the reaction device; material particles are radially injected through a stainless steel pipe by carrier gas, and the material burning process is recorded by a high-speed camera and a CCD (Charge Coupled Device) camera; a temperature in the reactor is represented by a thermocouple; and the flue gas analysis device is used for collecting and detecting burnt material and gas phase parts. The ultrahigh speed material heating system uses the plasmas as a high-temperature heat source, can meet the requirement for ultrahigh speed material heating, reaches the requirement of industries of coal, power, chemical engineering, metallurgy and the like for high speed heating, also meets the high speed heating temperature in the scientific research process, and has the advantages of simple structure, easiness for operation and the like.

The invention discloses a timing ending type pulse controlled floating charger, and belongs to the field of electronic technique. The timing ending type pulse controlled floating charger consists of atrickle resistor, a constant current unit, a charge unit, an interface unit, a pulse oscillating unit, a timing ending unit, a voice control unit, a load unit and a process indicating unit; the constant current unit is used for providing constant current for the charge unit, and thus constant current charging is realized; however, under the control of the interface unit, a charging and charging-stop pulse charging mode of the charging unit and the pulse oscillating unit is formed, and the charging time is longer than the charging-stop time, so that scientific charging for a charged battery isrealized, and the rejection rate is reduced; a timing ending type is adopted, a timer in the timing ending unit is low in static power consumption and wide in operating voltage range; after timing isended, the interface unit and the voice control unit are turned on, voice reminding is emitted while the charge unit is turned off, and simultaneously, the trickle resistor is used for providing sustaining trickle for the charged battery. The timing ending type pulse controlled floating charger is simple in circuit and easy to produce and debug, and is extremely applicable for microenterprise production.