227results about How to "Low requirements for experimental conditions" patented technology

The invention discloses a corona aging acceleration device and a corona aging acceleration method for a polymer insulating material. The device comprises a sealed corona aging experimental case in which a pin array electrode and a metal plate electrode are arranged, wherein the pin array electrode is connected with a high voltage generation device; the metal plate electrode is grounded; a pinpoint array is arranged on the pin array electrode; a test sample is arranged on the metal plate electrode, and is opposite to the pinpoint array; and after voltage is applied, uniform corona discharge is generated between the pin array electrode and the metal plate electrode to perform corona aging on the test sample. The device and the method have the advantages of low requirements on experimental conditions, convenience for operation and quantitative control over aging factors in an experiment, and short experimental period, and are applied to researches on the corona aging resistance of insulating materials in a laboratory.

The invention discloses an optical phase delay precision measuring method and a system thereof. The system of the invention comprises a laser, a polarizer, a photo-modulator, a modulation signal source, a measuring phase retarder, a phase compensator, a polarization analyzer, an optical detector and a result output unit. The method of the invention is as follows that the optical modulator is added into a light path for optical modulation of detection polarized light and then modulation polarized light is generated; a result display unit realizes conversion from measurement of direct current zero point to measurement of alternate current zero point after conducting filtering process of the received signal, therefore, the position of an extreme point can be determined accurately and the measuring precision can be improved. The measurement of the invention is simple and convenient and the result is accurate and reliable, meanwhile, the precision is up to lambada/300; the invention is suitable for production of a wave plate and other optical delay devices and detection of the product in the sales department.

The invention provides a lithium metal oxide composite positive electrode material with a multilayer structure, a precursor material for constituting the same, and a preparation method and an application for the precursor material. The invention relates to the lithium metal oxide composite positive electrode material used for a lithium ion battery, and a preparation method and an application for the lithium metal oxide composite positive electrode material. The invention aims to solve the ubiquitous problems of low specific capacity, bad cycling performance, high improvement cost and low tap density existing in the lithium metal oxide composite positive electrode material. According to the preparation method, primary granules are controlled in real time to be arranged based on layers in a coprecipitation method reaction process by enabling metal salt solution components to be subjected to stage changes and cease type overflowing; the metal salt components of the primary granules in each layer are different; a precursor of the high-performance lithium metal oxide composite positive electrode material with the multilayer structure is obtained; and the lithium metal oxide composite positive electrode material with the multilayer structure is finally synthesized by the combination of a gradient temperature rise way. The lithium metal oxide composite positive electrode material is used for the lithium ion battery.

The invention relates to a method and a system for precisely measuring phase delay of a wave plate. The system comprises a light source, wherein an optical fiber coupler, a polarizer, a compensator, a sample to be tested, a polaroid, an analyzer, an imaging lens, a monochromator and a detector are arranged sequentially on the forward direction of the light emitted by the light source; the compensator is driven by a motor controlled by a computer to rotate; the output of the detector is transmitted to the computer for data process via a data acquisition card; the computer controls the monochromator through the data acquisition card to select wavelength; and the computer transmits a pulse signal to the motor through the data acquisition card to drive and control the motor to rotate the compensator in fixed step length. The method comprises the following steps of: establishing four non-linear equations by using the phase delay of the wave plate as an unknown parameter on the basis of rotating an ellipsometer of the compensator; and evaluating to obtain the phase delay of the sample to be tested. By the measuring process, the self-calibration of the phase delay of the compensator is realized and the system error caused by inaccurate calibration is eliminated. By a three-step measuring method, the influence of the azimuth angle error of the polarizing component of the system is eliminated.

The invention discloses core-shell ceramic microspheres and a preparation method thereof, and belongs to the technical field of ceramic microspheres; a method combining an emulsion technique and a precursor transformation method is adopted for preparation. The preparation method comprises the steps: firstly, carrying out surface modification of SiO2 with a silane coupling agent, dispersing the modified SiO2 in an aqueous phase system by the emulsion method, dropping an oil phase ceramic precursor polysiloxane, carrying out ultrasonic dispersion to obtain a uniform emulsion, and carrying out a hydrothermal reaction in a high-pressure kettle to obtain SiO2/PSN microspheres; and then sintering the microspheres in a vacuum furnace, cracking polysilazane at high temperature to form a SiCN ceramic, and thus obtaining the SiO2/SiCN core-shell ceramic microspheres. The preparation method is simple and has excellent performance; the surface of the SiO2 microspheres is coated with a layer of non-oxidized SiCN shell, and thus the high-temperature heat-insulation performance of the SiO2 based core-shell structure microspheres can be improved.

The invention belongs to the technical field of perovskite-like nanocrystals. The invention discloses a preparation method of Cs<3>Cu<2>X<5> nanocrystalline and a product. The preparation method comprises the steps that indium halide InX3 or zinc halide ZnX2 is additionally introduced into a precursor solution for preparing Cs<3>Cu<2>X<5> nanocrystalline through a thermal injection method, preparing the Cs<3>Cu<2>X<5> nanocrystalline through a thermal injection method, wherein X is selected from Cl, Br and I. According to the preparation method, a key precursor for regulating and controlling the growth of the nanocrystalline in the preparation method of the nanocrystalline is improved; indium halide or zinc halide is used as an additive in a precursor, and a copper element is used as a substitute of a lead element, so that the preparation of the lead-free metal halide light-emitting nanocrystal is completed, the preparation process is easy to implement, the cost is low, and meanwhile,the defects of the lead-containing halogen perovskite nanocrystal can be overcome.

The invention discloses a method for measuring contents of ferrous ions and iron ions in glass, comprising the following steps: measuring the absorption spectrum of a provided glass sheet within the waveband range of 350-1100nm by using an ultraviolet and visible spectrophotometer; dividing the absorbency data in the absorption spectrum by the thickness of the glass sheet to obtain the absorbency of glass sheet with unit thickness, thereby further obtaining the spectrum curve of relationship between the wavelength in the absorption spectrum and the absorbency of the thickness of the glass sheet; carrying out smoothing treatment and basic line correction on the spectrum curve successively; and carrying out area integration on the spectrum curve after line correction respectively within the waveband range of 370-400nm and within the waveband range of 520-1100nm, and calculating the contents of iron ions and ferrous ions according to corresponding integrated areas. By using the method, the contents of iron ions and ferrous ions can be measured simultaneously, the operation is simple and fast, data processing is simple and convenient, and the reliability and the repeatability are good, therefore, the method can meet on-line monitoring requirement of glass and is applicable to industrial popularization.

The invention provides a separation method for mouse female germline stem cells in the technical field of transgenosis engineering. The separation method comprises the following steps: step one, collecting a mouse ovary, and adopting a two-step enzymic digestion method for preparing germline stem cell suspension; and step two, adding mvh first antibody and then second antibody magnetic bead in the cell suspension and re-suspending the cells, thus separating the female germline stem cells. The invention also provides a culture in vitro method for the mouse female germline stem cells, which comprises the following steps: transferring the female germline cells on an STO cell culturing layer, adding female germline stem cell culture solution, and conducting primary culture and subculture on the female germline stem cells, thus obtaining purified and stable germline stem cells. In the method, the mouse female fermline stem cells are separated and cultured in vitro successfully at first time, the methods are simple, the cost is low, the requirements on experiment conditions are low, and the operability is strong.

The invention discloses a conjugate two-component solvent-free electrospinning nanofiber and a preparation method and device thereof. By means of special material electrospinning nanofiber obtained through two-component solvent mixing, reacting and curing, the application fields of solvent-free electrospinning are widened. The device comprises two liquid storage mechanisms which are each connectedwith a spinning spray head and both connected with a driving mechanism driving liquid to enter the spinning spray heads, injection openings of the two spinning spray heads are opposite, one of the spinning spray heads is electrically connected with the positive electrode of a positive high voltage power supply, the negative electrode of the positive high voltage power supply is grounded, the other spinning spray head is electrically connected with the negative electrode of a negative high voltage power supply, the positive electrode of the negative high voltage power supply is grounded, and grounded collection electrodes are arranged under the two spinning spray heads. Accordingly, the preparation method is simple, the device is simple in structure, the experiment condition requirements are low, the raw material utilization rate is high, and a very good application prospect is achieved.

The invention relates to the field of train collision experiments, discloses a construction method and system for a train scaling equivalent model applied to a collision experiment and aims to solve the existing technical problem that scaling model construction is complicated. According to the method, following the principle that a scaling model and an actual train impact acceleration are consistent, integral conversion is performed on a kinetic equation under the condition of not considering damping to obtain scaling factors of train mass and impact force and scaling factors of train speed and time; scaling criteria are formulated according to the scaling factors of the train mass and the impact force and the scaling factors of the speed and the time; and according to the scaling criteria, parameters of the scaling model are determined to construct the scaling model.

The invention discloses a method for obtaining the monocrystalline silicon holocrystalline face etching rate under the action of surface active agents. The method comprises the steps that 1, the experiment etching rate of each constraint crystal face is obtained; 2, the value range of target parameters and an optimization population for generating the target parameters are determined; 3, a Monte Carlo S-AEP silicon atom removal probability function under the action of the surface active agents is built, and the etching probability of target atoms is calculated; 4, the stimulation etching rate of the constraint crystal face of each individual in the population is calculated; 5, a certain constraint crystal face is selected as a base crystal face, and the emulation etching rate of the constraint crystal face of each individual in the population is calculated; 6, the optimal individual in the population is screened out through an individual fitness evaluation method; 7, whether the emulation etching rate of the constraint crystal face of the optimal individual meets the output condition or not is judged, if yes, the optimal individual is output and a monocrystalline silicon full etching rate curve is generated, and if not, the optimal individual is encoded and subjected to heritable variation, a next generation of population is generated, and a new round of cycle is started.

The invention discloses fluorocarbon/palladium/magnesium-niobium pentoxide gas dimming film and a preparation method thereof. The fluorocarbon/palladium/magnesium-niobium pentoxide gas dimming film comprises a magnesium-niobium pentoxide composite film layer, a palladium catalytic layer and a fluorocarbon hydrophobic layer which are arranged sequentially on a substrate. The preparation method includes: growing the magnesium-niobium pentoxide composite film layer on the substrate, growing the palladium catalytic layer in situ on the magnesium-niobium pentoxide composite film layer, and depositing the fluorocarbon hydrophobic layer outside the fluorocarbon hydrophobic layer. Catalytic effect of palladium helps promote reversible conversion of hydrogen gas and hydrogen atoms in the hydrogen absorbing and hydrogen removal stages; niobium pentoxide is added to accelerate diffusion of hydrogen atoms in a magnesium substrate, magnesium hydroxide forms and decomposes faster, and the film can be repeatedly converted between a reflecting state and a transaprent state. The fluorocarbon film can effectively resist corrosion of inner film due to the external environment. The whole reaction process can be implemented at room temperature. The fluorocarbon/palladium/magnesium-niobium pentoxide gas dimming film has good weatherability, short response time, short recovery time and good process simplicity, and has important application prospect in the field of intelligent glass.

The invention discloses a modification method and application of activated carbon. The modification method of the activated carbon comprises the following steps of S1, subjecting the activated carbon to drying treatment; S2, introducing a gas into an atmospheric-pressure low-temperature plasma device according to a gas flow rate of 1cc/min to 200cc/min, sending the activated carbon subjected to the drying treatment into the plasma device, making the activated carbon located at an ejection outlet of the low-temperature plasma device, controlling the movement speed of the ejection outlet of the plasma device to be 0mm/s to 30mm/s, and carrying out treatment for 0.5min to 30min, so as to subsequently obtain modified activated carbon. According to the modification method, the modification of the activated carbon through spark discharge is realized through a physical way; the specific surface area of the activated carbon is obviously increased; further, surface functional groups are also more abundant. The modification process is simple and convenient; the efficiency is high; further, no pollutants are generated.

The invention discloses a recombinase polymerase isothermal amplification and test strip combined method for detection of Staphylococcus aureus. The method includes the steps of: designing a specificStaphylococcus aureus primer pair, taking the Staphylococcus aureus genomic DNA as the template, conducting recombinase polymerase isothermal amplification, and applying a colloidal gold test strip toacquire the detection result. The method is rapid and simple, has no need for expensive instruments and equipment, can generate a detectable level product only through 10min amplification under a 40DEG C constant temperature condition, and does not need a tedious electrophoresis process, a result can be acquired within 5min of colloidal gold test strip detection, and the result can be observed bynaked eyes. In addition, the method has strong specificity, is free of reaction with other bacterial genuses, has high sensitivity, and makes up for the disadvantages of the existing traditional detection technology. The method is expected to be applied to grass-roots inspection and quarantine institutions and become a conventional detection means, and is of important significance for improving food hygiene level, ensuring food safety and promoting the international food trade development.

The invention provides a method for simultaneously measuring electro-optic coefficients Pockels and Kerr, belonging to the technical field of electro-optic measurement. In the method, surface plasmon wave is excitated by adopting prism coupling so that the energy of the incident light is coupled into the surface plasmon wave mode and the guided wave mode and the energy of the reflected light attenuates rapidly to form a series of resonance curves, namely attenuated total reflection (ATR) curves; and a triangular wave voltage is applied to modulate the incident light, the ATR curves slightly move horizontally, the intensity of the reflected light varies, and the coefficients Pockels and Kerr are solved through the variable quantity.