53results about How to "The experimental setup is simple" patented technology

The invention discloses a method for measuring the Seebeck coefficient of micro/nano thermoelectric materials or devices, which comprises the following steps of: connecting the two ends of a sample formed by connecting two thermoelectric materials with heat sinks, putting into a vacuum environment, introducing alternating current I0 sin(omega t) with frequency omega and amplitude I0, generating parabolic temperature distribution on the sample to be measured through a Joule heating effect, and adding one steady component and two harmonic components to obtain the temperature at a junction of the materials to be measured, wherein for the thermoelectric materials, the steady temperature component at the junction and a temperature difference formed at the heat sink ends can generate direct-current Seebeck thermal electromotive force due to a Seebeck effect; and acquiring a direct-current voltage signal and theoretically solving a steady temperature difference simultaneously, so that the Seebeck coefficient of the thermoelectric materials to be measured can be obtained. The method has the advantages of high measuring accuracy, simple experiment device, low test cost and the like, and iseasy to implement, and a new idea is provided for evaluating and representing a micro/nano scale thermoelectric conversion system.

The invention provides a method of preparing molybdenum disulfide microspheres through sulfurizing and reducing a soluble molybdenum source in a reversed-phase microemulsion system. The method includes a) a step of preparing a reversed-phase microemulsion A through adopting polyethylene glycol octylphenol ether (Triton X-100), n-hexanol, cyclohexane and an aqueous solution of the soluble molybdenum source as a surfactant, a cosurfactant, an oil phase and a water base respectively, b) a step of adding an aqueous solution containing a sulfur source and a reductant into the reversed-phase microemulsion A to obtain a reversed-phase microemulsion B, and c) a step of transferring the reversed-phase microemulsion B to a hydrothermal reactor, performing crystallization thermal treatment at a certain temperature for a certain period of time, separating, washing, and drying the reaction product to obtain the molybdenum disulfide microspheres. The method is simple and mild in reaction conditions. Through characterization by a scanning electron microscope and a transmission electron microscope, the molybdenum disulfide microspheres have the characteristics of being solid or hollow, smooth or wrinkled in surface, and the like.

The invention discloses a friction performance testing device for a slipper pair of a high-pressure axial plunger pump. The left and right sides of a box body are respectively provided with a high-pressure oil chamber and a sealed experiment chamber; the left and right ends of the box body are respectively provided with a left end cover and a right end cover of the box body; the high-pressure oil chamber is internally provided with a thrust piston; the end part of a piston rod of the thrust piston is arranged in the sealed experiment chamber and is connected with a slipper for testing through a connecting bolt; a swash plate stationary shaft is arranged on the right end cover of the box body; one end of the stationary swash plate shaft is arranged in the sealed experiment chamber, and a swash plate for testing is connected to the end through a bolt; and the other end of the swash plate stationary shaft is connected with a variable-frequency motor through a shaft coupling, and the variable-frequency motor is controlled by a frequency converter. By using the friction performance testing device, not only can the dry friction performance of the slipper pair of the high-pressure axial plunger pump be tested, but also different working states can be simulated to test. The friction performance testing device has the advantages of simple structure, convenience in use, accuracy in testing, low manufacturing and using costs and the like.

The invention provides a method for on-line concentration and automatic analysis of endogenous polypeptides, and a special device. The method comprises the following steps: by utilizing the unique characteristic that a restricted access medium retains small molecular polypeptides and expels macromolecular proteins, the endogenous polypeptides are subjected to on-line concentration; a water solution, in which the volume concentration of formic acid or acetic acid is 0-5%, is used for leading a sample to pass through a pre-column of the restricted access medium for concentration; a buffer solution with the salt concentration being 10mM-2000mM and the pH value being 1-4 is used for eluting the sample concentrated in the pre-column to a reversed-phase column head; and the sample on the reversed-phase column head is subjected to separation and mass spectrometric detection with water/acetonitrile or water/methanol with the volume concentration ranging from 0% to 100%. By adopting the pre-column of the restricted access medium of a capillary and the stepwise gradient for elution, the invention achieves the effect of greatly simplifying the experimental facilities. The device can engage in on-line coupling with mass spectrum, and has the characteristics of simple operation, small sample consumption, the ability of carrying out multidimensional separation and the like.

The invention discloses a device for measuring the width of a single picosecond laser pulse. The device consists of a beam splitter, a delay adjustor, a first reflector, a second reflector, a reflection grating, a KDP frequency doubling crystal, a filter, a CCD array and an oscilloscope, which have the following position relationships that: the beam splitter is arranged in the input direction of the laser pulse to be measured; the laser pulse beam to be measured is split into a transmission beam and a reflection beam through the beam splitter; the transmission beam enters the KDP frequency doubling crystal through the delay adjustor and the first reflector; the reflection beam also enters the KDP frequency doubling crystal after passing through the second reflector and the reflection grating; and the two beams generate non-collinear related signals in the KDP frequency doubling crystal, and the related signals enter the CCD array through the filter and are finally displayed on the oscilloscope. The width of the measured pulse can be acquired through calculation. The device for measuring the width of the single picosecond laser pulse not only effectively improves the sensitivity of the measurement, but also enlarges the wavelength range of the measurable pulse.

The invention relates to a natural sericin encapsulated mesoporous silicon nano-carrier and a preparation method and application thereof to the field of tumor treatment. The preparation method comprises the steps of preparing pure sericin solids; preparing mesoporous silicon nano-particles; preparing aminated, formylated or dual-sulfurated mesoporous silicon nano-particles with regular pore passage; preparing drug-loaded aminated, formylated or dual-sulfurated mesoporous silicon nano-particles; preparing a pH/protease or reduction/protease dual-responsiveness sericin/mesoporous silicon composite multifunctional control system. The natural sericin encapsulated mesoporous silicon nano-carrier and the preparation method and the application thereof have the advantages that the operation is simple to perform, the raw materials are simple and convenient to obtain, the cost is low, the universal applicability is high, no special complex equipment is needed and the like. The nano composite system prepared by adopting the method fully utilizes the characteristics of the sericin on the outer layer and the mesoporous silicon nano-particles on the inner layer, has pH/protease or reduction/protease dual responsiveness, has multiple functions of inhibiting tumor cells, monitoring nano-particle positioning and drug release in real time and the like, is high is drug loading capacity, is good in biocompatibility and has a wide application prospect in the field of tumor diagnosis and treatment, especially in the aspect of solving multi-drug resistance of tumors.

The invention relates to a preparation method of organic/inorganic hybrid nano fiber drug carrying microspheres. The preparation method comprises the following steps of (1) preparing drug carrying nano particles, preparing a high-molecular polymer solution; (2) adding the drug carrying nano particles into the polymer solution, dispersing with ultrasonic wave, stirring, to prepare a homogeneous mixed solution; (3) adding hydrogen peroxide into the mixed solution, oscillating with ultrasonic wave under an ice bath condition, to obtain a water-in-oil primary emulsion; and (4) preparing an external water phase solution, adding the external water phase solution into the water-in-oil primary emulsion drop by drop, oscillating with ultrasonic wave or homogenizing mechanically, to form an oil-in-water-in-oil secondary emulsion, stirring until the residual organic solvent is volatilized completely, collecting microspheres, and drying by freezing, so as to obtain products. The hybrid nano fiber drug carrying microspheres prepared by the preparation method have low density, large specific surface area, high surface infiltration capacity, are safe and nontoxic, are degradable, have excellent biocompatibility and can be controlled to release for a long time, and therefore, the application prospect is wide.

Disclosed are a magneto-acoustic coupling imaging excitation and detection method and device based on low-frequency continuous waves. The method comprises the two steps of generation of excitation signals of the low-frequency continuous waves and detection of the low-frequency continuous magneto-acoustic waves. According to generation of the excitation signals, the low-frequency continuous waves are used for conducting excitation on an imaging sample, the excitation waveform is realized by adopting continuous sine waves or continuous sine pulses with a duty ratio, and the frequency of the excitation signals is determined according to the imaging sample and spatial locating precision. Detection of the low-frequency continuous magneto-acoustic waves is realized by the adoption of a continuous wave signal detection method or a lock-in amplifying method. The device comprises a function generator used for generating the excitation signals of the low-frequency continuous waves and a power amplifier connected with the output end of the function generator and used for conducting amplifying on the output excitation signals, the output end of the power amplified is connected to the detected sample placed in a magnetic field and the output end of the function generator is further connected with a detector. The magneto-acoustic coupling imaging excitation and detection method and device have the advantages that the test devices are simplified, the excitation source designing difficulty is lowered and the application safety of the imaging method is improved to some extent.

The invention discloses a catalyst for producing levulinate through furfural. The catalyst comprises the following components in percentage by mass: 0.5-5% of metal components, 5-30%of acid components, and the balance of carriers. The catalyst disclosed by the invention has the advantages of simple process, mild reaction conditions, low energy consumption, zero pollution and high yield.

The invention discloses a method for preparing nano-fibers with special structures by using electrostatic spinning. The method comprises the following steps of: (1) preparing high molecule nano-fibers by using an electrostatic spinning technology; and (2) forming the special structures of fluffs and wrinkles on the surfaces of the nano-fibers by using a supercritical carbon dioxide quick depressurization method. The method has the advantages that: (1) the nano-fibers are prepared by the electrostatic spinning technology, an experimental device is simple and easy to operate, and the diameters of the prepared nano-fibers are controllable and adjustable; (2) a supercritical carbon dioxide microcellular foaming technology is adopted, so that the special structures of the fluffs and the wrinkles on the surfaces of the nano-fibers, such as the depths, widths and the like of the wrinkles, can be regulated by regulating foaming time, foaming pressure and foaming temperature; and (3) the method is applied to various high molecular polymers, and has a wide application range.

The invention discloses a real-time monitoring method for shrinkage volume of epoxy resin in a curing process. The method comprises steps as follows: pipettes and temperature sensors are fixed at openings of dropping bottles through rubber plugs, the temperature is increased to the test temperature, and heat is preserved; a to-be-tested epoxy resin curing system is uniformly mixed and put into a PE (polyethylene) bag to serve as a to-be-tested group; epoxy resin with the same weight is taken and put into a PE bag to serve as a control group, the to-be-tested group and the control group are simultaneously put into the two dropping bottles respectively, and heights of liquid columns in the pipettes are adjusted to be in a 0 scale line; reading is performed according to the liquid level change of the pipettes; a volume change curve of the control group is subtracted from a volume change curve of the to-be-tested group, and a real-time chemical shrinkage curve of the to-be-tested epoxy resin during curing is obtained. The chemical shrinkage of the epoxy resin can be monitored in real time through addition of a control bottle on a traditional capillary dilatometer. Compared with the prior art, the method has the advantages of convenience, high accuracy, wide applicability, capacity of fully monitoring the resin curing process and the like.

The invention relates to an anisotropic rock damage degree test device and a test method thereof, and aims to provide the anisotropic rock damage degree test device which is simple in structure, convenient to operate and lower in cost, as well as the test method of the test device, so as to directly measure the gas permeability of the damaged rock in different directions. The technical scheme of the invention is as follows: the device is used for testing a circumferential gas permeability coefficient and an axial gas permeability coefficient of a rock sample, and includes an axial pressure device and a circumferential pressure device which are used for applying pressure on the rock sample in the axial and circumferential directions respectively; an intermediate drilling hole is formed in the middle of the rock sample; the device also includes pressure plates, a closed sleeve, a pressure pump, a water storage container, a pressure gauge and a measuring tube; the closed sleeve sleeves the rock sample in a co-axial manner; the pressure plates are arranged between the axial pressure device and the upper and lower ends of the rock sample; the pressure pump is connected to the lower end of the rock sample through an air inlet pipe; the upper end of the rock sample is connected to the interior of the water storage container via an air outlet pipe and the measuring tube sequentially; the pressure gauge is connected onto the air outlet pipe. The anisotropic rock damage degree test device and the test method, provided by the invention, are applicable to the field of underground engineering.

The experiment apparatus for isothermal container discharge method in measurement and control fields includes gas source, decompression valve, stop valve, temperature sensor, isothermal container, pressure sensor, data recorder, barometer, upstream rectifier tube, upstream rectifier tube joint, downstream rectifier tube joint, and downstream rectifier tube connected together, except the barometer set in atmosphere directly. The element to be measured has its intake connected via the upstream rectifier tube joint with the upstream rectifier tube and its exhaust connected via the downstream rectifier tube joint with the downstream rectifier tube. The experiment apparatus of the present invention has simple structure, short measurement time, low air consumption and other advantages.

Method for measuring the come-and-go loss in the cavity of LD pumping solid laser. The procedures are: first determining the relationship between the laser power and the pumping power measured from the experiment; which experiment result is then substituted in the rate equation to proceed numerical equating to determine the loss in the cavity; in the rate equation, considered are the laser oscillation and other transition steps which affecting the running of a laser, and considering the pumping light and laser being all Gaussian distribution. This invention method is particularly suitable for measuring the come-and-go loss in low gain microchip solid laser cavity.

The invention discloses a method for preparing sodium-potassium bismuth titanate nano-microspheres by a micro-emulsion method. The method comprises: I, weighing raw materials, dissolving sodium nitrate and potassium nitrate into water to obtain a mixture A, and mixing bismuth nitrate with water to obtain a mixture B; II, mixing cyclohexane with tetrabutyl titanate to obtain a mixture C; III, preparing mixing auxiliaries; IV, mixing the cyclohexane with the mixing auxiliaries to obtain a mixture D, regulating the pH value after dropwise adding the mixture A, and then, dropwise adding the mixture B, thereby obtaining a mixture E; V, mixing the mixture C with the mixture E, forming microemulsion by magnetically stirring, and carrying out ageing treatment on the microemulsion; and VI, centrifugally filtering, getting filter residues, washing and drying the filter residues, thereby obtaining the sodium-potassium bismuth titanate nano-microspheres. According to the method disclosed by the invention, the sodium-potassium bismuth titanate nano-microspheres with single perovskite phase are obtained under a relatively low temperature condition; and the sodium-potassium bismuth titanate nano-microspheres can be widely applied to the high-tech technical fields of sensors, detectors, ultrasonic sensors and the like.

The invention discloses a preparation method of a TiO2@Cd0.9Zn0.1S core-shell structure nano-rod photocatalyst. The preparation method comprises the following steps: S1, dispersing Cd0.9Zn0.1S nanorods into a glycol-containing aqueous solution to obtain suspension liquid; S2, dissolving a certain amount of tetrabutyl titanate into glycol, and rapidly adding into the above suspension liquid; S3, washing and drying the product obtained in the step S2 to obtain a target product. In the TiO2@Cd0.9Zn0.1S core-shell structure nano-rod photocatalyst prepared according to the preparation method, the TiO2 core layer is wrapped tightly and does not have defects, so the stability of the Cd0.9Zn0.1S photocatalyst is greatly improved; due to formation of an II-type energy band structure, the photocatalytic activity is further improved.

The invention relates to a regular rod-shaped porous Er/Eu-ZnO composite material and a preparation method thereof, and belongs to the technical field of nanometer material preparation. A template method and a hydrothermal method are combined; CTAB is firstly used as a template agent; Zn(CH3COO)2 is used as a zinc source; pore ordered porous zinc oxide precursors are prepared; then, the hydrothermal method is used for assembling europium chloride and erbium chloride with different mass percentage into porous ZnO base bodies; the europium chloride and the erbium chloride are object ingredientsand mineralizers; under the hydrothermal conditions, induction is performed to obtain the regular rod-shaped porous Er/Eu-ZnO composite material. The prepared composite material has the regular and ordered pore passages and larger specific surface area, and has high adsorption capability on fluid. Through the observation via a scanning electron microscope, the material has the longer rod-shaped structure and the uniform appearance rule; the emission of ZnO base bodies is promoted through the mixing of rare earth ions. The material of the novel nanometer structure has important application prospects of the field of luminous materials. The method is simple; the implementation is easy; the mass production can be realized; wide application prospects are realized.

The invention discloses a device and a method for determining the migration resistance of a single bubble in a pore. The device comprises a support table. A lifting rod and a pore throat unit are arranged on the support table. A pore throat is formed in the pore throat unit. A water container is arranged on the lifting rod. The upper end of the water container is communicated with the atmosphere,and the lower end of the water container is communicated with the pore throat through a liquid delivery pipe. A foaming pipe is arranged on the liquid delivery pipe. The foaming pipe is communicated with the liquid delivery pipe. An air pump is arranged on the foaming pipe. One end of the pore throat is communicated with the atmosphere. According to the experiment device and the method for determining the resistance of the single bubble passing through a single pore throat, the experiment device and the determination method is simple, the determined data is accurate, and the like.

The invention relates to a coralloidal Zn-ZnO composite material and a preparation method thereof and belongs to the technical field of preparation of nanometer materials. The preparation method comprises the following steps: combining a template method and a hydrothermal method, taking CTAB (Cetyltrimethyl Ammonium Bromide) as a template agent, taking Zn(CH3COO)2 as a zinc source, and synthesizing an ordered porous ZnO powder substrate by adopting the template method; taking the synthesized ordered porous ZnO as a precursor, taking zinc chloride as a mineralizer, and synthesizing the coralloidal Zn-ZnO composite material by adopting the hydrothermal method. The prepared coralloidal Zn-ZnO composite material has large specific surface area, so the gas adsorption ability is excellent. By virtue of observation of a scanning electron microscope, the material has a unique coralloidal structure and good morphology. The novel nanometer structure material has important application prospects.The method disclosed by the invention is simple and feasible, can realize batch production, and has wide application prospects.

The invention relates to a method for preparation of a silver antimony telluride thermoelectric material by combining low temperature solid phase reaction with hot pressing process. The method comprises the steps of: 1) ingredient compounding: according to the stoichiometric ratio of each element in the chemical formula AgSbTe2+x, weighing elemental silver, elemental tellurium and elemental antimony as raw materials, wherein x is 0-0.02; 2) briquetting sealing; 3) solid phase reaction: raising the temperature of the vacuum-tight block obtained in step 2) to a reaction temperature of 390-450DEG C, and conducting heat preservation for 6-12h to obtain a single phase silver antimony telluride ingot body or approximate single phase silver antimony telluride ingot body; 4) hot-pressing: grinding the obtained ingot and then performing hot pressed sintering, thus obtaining the high density silver antimony telluride thermoelectric material. The method has the characteristics of low reaction temperature, simple and controllable process, low preparation cost, and the prepared silver antimony telluride block material has the advantages of high density, high purity, good repeatability and excellent thermoelectric properties.

The invention discloses a quenched steel machining white layer detection method based on an electrochemical detection device. The method includes the steps: (1) selecting quenched steel to be detected and manufacturing the electrochemical detection device; (2) measuring an alternating current impedance spectrum of the quenched steel to be detected to obtain a charge transfer resistance value; (3) judging whether the surface layer of the quenched steel to be detected exists a white-layer tissue or not: (3.1) presetting a characterization value range of the quenched steel to be detected for machining a white layer; (3.2) determining that the surface layer of the quenched steel to be detected is provided with the white-layer tissue if the charge transfer resistance value obtained in the step (2) is within the characterization value range of the white layer, and determining that the surface layer of the quenched steel to be detected is not provided with the white-layer tissue if the charge transfer resistance value obtained in the step (2) is not in the characterization value range of the white layer. The quenched steel machining white layer detection method solves the problem of difficult and accurate and lossless detection when the white layer is machined by the quenched steel to be detected and provides technical support for rapid, in-situ and undamaged detection of white layers of parts through the electrochemical detection device.

The invention relates to a synchronous characterization method for an orthotropic elastic constant virtual field of a high-speed impact special-shaped piece. The synchronous characterization method comprises the following steps of: designing a proper special-shaped piece high-speed impact loading configuration to ensure that a test piece can generate balanced positive strain and shear strain undera one-way impact condition, and establishing a dynamic virtual field identification algorithm of an orthotropic elastic parameter; synchronously and accurately identifying all parameters of the orthotropic elasticity from a plurality of impact loading moments by adopting a least square global optimization method. Compared with the prior art, the method is not limited by one-dimensional stress waves and uniform deformation state assumed conditions, multi-parameter global representation of the orthotropic elasticity can be achieved only through one-time direct impact of bullets and acquisitionof a high-speed deformation field of a test piece, the number of experiments can be reduced to the maximum extent, and meanwhile, a huge bar system in a Hopkinson bar method is not needed, and an experimental device is simplified.

The invention relates to a spouted fluidized bed with a tar catalytic cracking function. The spouted fluidized bed comprises a spouted fluidized bed body, wherein the bed body is provided with a gas inlet pipe and pyrolysis gas inlet ports, the spouted fluidized bed body is internally provided with a guiding pipe, a semi-coke feeding port is formed in the top end of the spouted fluidized bed body,the guiding pipe is connected in the spouted fluidized bed body through supporting rods, the spouted fluidized bed is externally connected with a spiral feeding machine, a gas-solid separator and a semi-coke collecting tank, the gas-solid separator and the semi-coke collecting tank are arranged at the two sides of the spouted fluidized bed body respectively, baffle plates are arranged at the inner wall of the spouted fluidized bed body and above the guiding pipe, and the baffle plates are arranged in a spouted area under a suspension flow section of the spouted fluidized bed body. The spoutedfluidized bed with the tar catalytic cracking function solves the problems of short time and low utilization rate of semi-coke participating in a cracking reaction in the prior art, and greatly improves the efficiency of the semi-coke participating in the reaction.