31results about How to "Extend the experiment time" patented technology

The invention provides an experiment device and an experiment method for simulating thermal jet flow interference. The experiment device comprises a hypersonic wind tunnel, an experiment model, a bracket, a Laval internal nozzle, a model nozzle, a heater, an air storage tank, an air cylinder and a CF4/SF6 gas cylinder, wherein an air source is compressed and expanded through the hypersonic wind tunnel and then becomes hypersonic airflow to provide an experiment with external flow; a CF4/SF6 gas is mixed with air and then provides the experiment with internal jet flow; the specific heat ratio required by the experiment is obtained through controlling the molar mixing ratio and the temperature of the CF4/SF6 gas and air, so that the requirements on specific heat ratio simulation of the jet flow in the experiment are met; and simulation of a jet flow interference experiment of the specific heat ratio of the jet flow is achieved in a common wind tunnel. The experiment method has the advantages of being relatively long experiment time, free of pollution, low in thermal load and low in cost, and therefore, the experiment method can be used as an effective means for evaluating the performance of the spray pipe of a hypersonic aerocraft.

The invention discloses a detonation-driving shock tunnel explosive discharge device, which comprises a shock tunnel, wherein the shock tunnel comprises a detonation driving section and an explosive discharge section, an explosive discharge throttling device is installed between the detonation driving section and the explosive discharge section and is used for adjusting flow rate of high-pressure airflow entering the explosive discharge section and formed on the detonation driving section, and the side of the explosion discharge throttling device which is close to the explosive discharge section is provided with a diaphragm. The explosive discharge throttling device is additionally arranged between the explosive discharge section and the detonation driving section and is used for adjusting the flow rate of the high-pressure airflow entering the explosive discharge section and formed on the detonation driving section, so on the one hand, the flow of the airflow is adjusted, and on the other hand the pressure of the air inside the detonation driving section is not decreased rapidly, and the experiment time of the detonation driving shock tunnel is further increased.

The (Streptococcus suis Serotype 2 (SS2) virulence gene PCR amplification kit includes a SS2DNA contrast template, a PCR amplification detecting reagent, an agarose gel electrophoresis reagent and a DNA gradient standard. The PCR amplification detecting process includes the measurement of 7 important SS2 genes, diagnosing Streptococcus infection and SS2 infection based on whether to amplify specific Streptococcus gene, specific SS2 gene and 5 relevant important SS2 virulence genes, and predicting the virulence, invasiveness trend and disease prognosis fast and early. The present invention is favorable to the clinical diagnosis of borderline case and early warning, and is hopeful to be applied in emergency detection of human SS2 infection, etc.

The invention provides a multiplex amplification detecting system of a microsatellite instable state and application thereof. The multiplex amplification detecting system comprises 13 pairs of primerswhich are capable of amplifying 13 sites comprising 9 mononucleotide repeat sites (NR-21, NR-24, BAT-25, BAT-26, MONO-27, BAT-52, BAT-56, BAT-59 and BAT-60), 2 pentanucleotide repeat sites (Penta C and Penta D) and 2 reagent internal reference sites (QS90 and QS330), and optimizing the proportioning of the detecting system and the concentrations of the primers. A large amount of experiments verify that 13 sites can be finally and simultaneously amplified in one-tube reaction, and higher specificity and higher sensitivity are obtained; meanwhile, sample internal reference sites and reagent internal reference sites are added, so that interference caused by factors of sample mixing, reagent invalidation and the like during a whole detecting process can be avoided, and higher application value is obtained.

The invention provides a portable operation platform capable of realizing stacking of two-dimensional layered heterogeneous materials. The portable operation platform is characterized in that when a sample and a glass slide are replaced, a microscope can be removed from a rotary objective stage; when the two-dimensional layered materials are stacked, the angles of sample materials can be adjusted by a track type rotary control platform; when the materials are transferred and stacked, lifting and falling can be realized by the objective stage. The portable operation platform provided by the invention has the advantages that the aligning and calibrating time of the materials is reduced, the working space when the sample materials are arranged is enlarged, the failure of operators due to artificial mistakes is avoided, the stability in material stacking is improved, the flexibility of the experiment is increased, the difficulty of accurate positioning in stacking of the two-dimensional materials is effectively solved, and the application prospect in the aspect of manufacturing the two-dimensional layered heterogeneous materials is good.

The invention discloses a non-decoupling motion distribution method for a continuous on-orbit linkage trajectory capture experiment. The method comprises the following steps: acquiring the current poses of a main body model and a separation body model, giving a homogeneous transformation matrix among a wind tunnel coordinate system, a model centroid coordinate system and a decoupling point coordinate system, obtaining the poses of the main body model and the separation body model in the next time step length, and calculating the change distances of the relative positions in the X, Y and Z directions; distributing non-decoupling motion of the main body mechanism and the separation body mechanism according to the stroke allowance proportion; and controlling the main body and separation bodymechanism to complete non-decoupling motion in the X, Y and Z directions and respective angular motion to reach the next time step length poses of the main body model and the separation body model. According to the method, the main body mechanism and the separation body mechanism can be prevented from moving in the same direction, the utilization rate of experiment space is increased, longer experiment time and more captured track point positions are obtained, the service life of the main body mechanism and the separation body mechanism is prolonged, and the method has the advantages of simpleand rapid calculation and efficient and reliable operation.

The invention relates to a method for improving the transduction efficiency of rhabdovirus on mammalian cells. The method comprises the following steps of: preparing, constructing viruses, amplifying the viruses, determining titer, and performing low-pH-induced transduction, wherein the low-pH-induced transduction comprises the steps of pretreating cells and the viruses, combining the viruses with the cells, and performing low-pH-induced membrane fusion. The method is combined with sodium butyrate, so that AcMNPV serving as a vector expresses an exogenous protein through the steps of pretreating the cells and the viruses, combining the viruses with the cells, and performing low-pH-induced membrane fusion. By the method, the transduction efficiency of the AcMNPV on the mammalian cells and the expression level of the exogenous protein can be remarkably improved; and the method has potential application valve in the expression of exogenous proteins and gene therapy.

The invention relates to a processing technology of a high-temperature-resistant and long-life chromatographic gasket, and relates to the technical filed of gasket processing. A 1L glass stirring kettle is used, 10 g of high-purity graphite powder and 0.5-2g of high-purity Vespel raw material are respectively added through a charging port, high pure nitrogen is introduced at 30ml/min for protection, a 5A molecular sieve drying filter is added at a nitrogen gas path part, and the trace moisture in the gas path is removed to ensure that the moisture content of nitrogen is less than 10 PPB; because the moisture has a greater impact on the raw material, the raw material is heated to 400 degrees and stirred at a high speed for 3-6 hours; and then a sample is taken, the uniformity of the raw material is detected; after the specified index is reached, the heating is stopped, and the raw material is stirred until the temperature is room temperature; and the emptying and discharging are carried out. The high-temperature-resistant and long-life chromatographic gasket is prepared by a novel material formed by mixing a special material with pure graphite, and the service life of the chromatographic gasket is greatly prolonged.

The invention discloses a main body and separated body decoupling mechanism motion distribution method in a linkage track capture experiment. The method comprises the following steps: acquiring the current poses of a separation body model and a main body model at the current moment to obtain the theoretical poses of the separation body model and the main body model at the next time step length, and calculating the relative position change distances in the X, Y and Z directions; comparing the positive and negative travel margins of the separation body model and the main body model in the X, Y and Z directions respectively and determining planned movement in the X, Y and Z directions according to the larger travel margins; and controlling a main body mechanism and a separation body mechanismto complete X-direction, Y-direction and Z-direction movement and respective angle movement to reach the theoretical poses of the main body model and the separation body model of the next time step length. According to the method, the main body mechanism and the separation body mechanism can be prevented from moving in the same direction, the experiment space utilization rate is increased, longerexperiment time and more capture track point positions are obtained, the service life of the main body mechanism and the separation body mechanism is prolonged, and the method has the advantages of simple and rapid calculation and efficient and reliable operation.

The invention discloses a method for preparing a cement clinker in a laboratory. The method comprises the following steps: A, preparing a raw material, namely independently grinding different raw materials, screening, mixing, putting water into coal powder, kneading into balls, putting the balls into a high-temperature furnace, and mixing weighed materials and coal ash so as to obtain raw material powder; B, preparing a test sample, namely putting water into the raw material powder, uniformly mixing, putting into a mold, pressing, demolding, and drying the test sample in a drying oven; C, calcining a clinker, namely putting the dried test sample into a high-temperature furnace, and calcining according to procedures of staged heating and heat preservation; and D, cooling the clinker, namely performing sudden cooling by using a cooling fan, crushing the cooled clinker, uniformly mixing, and performing powder milling on the clinker, a retarded adhesive material and a mixing material, thereby obtaining expected cement. The method has great instruction significances for cement development in laboratories. The clinker can be prepared from conventional raw materials and industrial wastes as well, and the cement clinker prepared by using the method can completely meet auxiliary material design requirements.

The invention provides a metal processing mold having automatic feeding and discharging functions. The metal processing mold comprises a lower pressing die, a screw rod, a bearing seat, a male die, awork clamping board, a servo motor, a rotating shaft, an electric telescopic rod and an electromagnet, wherein the screw rod is arranged in the lower pressing die; the bearing seat is mounted on the screw rod; the male die is fixed to the upper end surface of the bearing seat, and is arranged on the upper end surface of the lower pressing die; the work clamping board is assembled on the upper endsurface of the male die, and through the design, a fine adjustment function is realized; the servo motor is fixed to the front end of the lower pressing die; the rotating shaft is mounted at the upperend of the servo motor; the electric telescopic rod is fixed at the right end of the rotating shaft; the electromagnet is mounted at the right end of the electric telescopic rod; and the electric telescopic rod and the electromagnet are arranged above the lower pressing die, and through the design, automatic feeding and automatic discharging can be performed. According to the metal processing mold disclosed by the invention, the fine adjustment function is realized, the automatic feeding and discharging functions are realized, and the metal processing mold is high in practicality, good in safety and high in reliability.

The invention discloses a main body and separation body track capture experiment motion distribution method for continuous on-orbit motion. The method comprises the following steps: acquiring the current poses of a separation body model and a main body model at the current moment to obtain the theoretical poses of the separation body model and the main body model at the next time step length, andcalculating the relative position change distances in the X, Y and Z directions; distributing the movement of the main body mechanism and the separation body mechanism according to the stroke allowance proportion; and controlling the main body mechanism and the separation body mechanism to complete X-direction, Y-direction and Z-direction movement and respective angle movement to reach the theoretical poses of the main body model and the separation body model of the next time step length. According to the method, the main body mechanism and the separation body mechanism can be prevented from moving in the same direction, the utilization rate of experiment space is increased, longer experiment time and more captured track point positions are obtained, the service life of the main body mechanism and the separation body mechanism is prolonged, and the method has the advantages of simple and rapid calculation and efficient and reliable operation.