159results about How to "Reduce the difficulty of experiments" patented technology

The invention discloses a non-alignment error correction method used for a geomagnetic element measuring system, which comprises the following steps: (1) a rectangular table-board is arranged and a reference coordinate system for the rectangular table-board is established; (2) a magnetic sensor of the geomagnetic element measuring system and an accelerometer are encapsulated together in a non-magnetic regular hexahedron; two surfaces of the non-magnetic regular hexahedron are attached to two vertical surfaces of the rectangular table-board; and a regular hexahedron coordinate system is established for the non-magnetic regular hexahedron; (3) the non-magnetic regular hexahedron is turned for multiple times, and after multiple times of turning, the non-magnetic regular hexahedron is still attached to the rectangular table-board; (4) multiple sets of measurement values of the non-magnetic regular hexahedron and the accelerometer during the process of multiple times of turning are utilized, and through solving multiple non-linear equations simultaneously, the non-alignment error of the magnetic sensor and the non-alignment error of the accelerometer are calculated; (5) the non-alignment error between the magnetic sensor and an inertial navigation is indirectly calculated to correct the non-alignment error of the measurement value of the magnetic sensor. The method has the advantages of simple principle, facilitation of realization and operation, higher correction accuracy, etc.

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 provides a gas compressor plane cascade experimental system with a suction baffle structure. The gas compressor plane cascade experimental system comprises a suction device and a plane cascade experimental device. The plane cascade experimental device comprises a left end plate, a right end plate, an upper baffle, a plurality of experimental blades and a lower baffle, wherein the upper baffle is arranged between the left end plate and the right end plate, and the multiple experimental blades are distributed at intervals. The upper baffle and the lower baffle are connected between the left end plate and the right end plate through fixing shafts. The upper baffle is provided with suction holes. Left end plate suction holes are formed in the left end plate, and right end plate suction holes are formed in the right end plate. The suction holes are connected with a vacuum pump through a pipeline. A three-hole probe 1 is arranged between the left end plate and the right end plate. In the experimental process, the upper baffle and the lower baffle are adjusted so that a cascade can be good in periodicity, the boundary layer of incoming flow is sucked through the left end plate suction holes and the right end plate suction holes, the influence area of the boundary layer is reduced, and uniform incoming flow is achieved. The gas compressor plane cascade experimental system with the suction baffle structure is an effective path for exploring improvement of the performance of a gas compressor, the influence of the boundary layer of the incoming flow is reduced, and meanwhile, the periodicity of the plane cascade is improved.

The invention discloses a modular animal digestive tract in-vitro simulation system and a human intestinal tract simulation method thereof. The modular animal digestive tract in-vitro simulation system comprises at least one animal digestive tract in-vitro simulation unit. Each animal digestive tract in-vitro simulation unit includes a frame, a reaction tank used for simulating a specific digestive tract cavity, and multiple function modules which can complete a specific and relatively independent task of intestinal tract simulation. Each frame is provided with multiple installation positions for installing the function modules and the reaction tank, and the function modules and the reaction tank are installed on the frame detachably. Each function module includes a sensor or a moving part, or includes both the sensor and the moving part. Each function module uses a separate Arduino nano 328 as a control chip, and is connected with an upper computer through a USB serial port. Each frame is equipped with a USB active hub. A USB is responsible for power supply to single chip microcomputers in the function modules and instruction transmission between upper and lower computers. Multiple function modules are integrated in one frame, so that the lab space is saved, the modules can be replaced rapidly, and a faulty module can be checked and replaced without shutdown.

The invention belongs to the technical field of magnetic measurement and particularly provides a geomagnetism vector system non-alignment correction method based on an axis rotating method. The method comprises the following steps that 1, a non-magnetic rotating table is arranged; 2, a magnetic sensor and an acceleration meter in a geomagnetism vector system are packaged into a non-magnetic regular hexahedron; 3, the non-magnetic regular hexahedron is arranged on a table board of the non-magnetic rotating table to ensure that the X-axis direction of the non-magnetic regular hexahedron is identical with the direction of a rotating shaft, and the rotating shaft rotates around the X-axis for N1 times to obtain N1 sets of measurement values of the magnetic sensor and the acceleration meter; 4, the Z-axis direction of the non-magnetic regular hexahedron is kept to be identical with the direction of the rotating shaft, and the rotating shaft rotates around the Z-axis for N2 times to obtain N2 sets of measurement values of the magnetic sensor and the acceleration meter; 5, the non-alignment angle from the magnetic sensor to the non-magnetic regular hexahedron and the non-alignment angle from the acceleration meter to the non-magnetic regular hexahedron are calculated respectively; 6, correction is finished by determining the coordinate converting relation between the magnetic sensor and the acceleration meter.

The invention relates to an isolated organ perfusion system, which comprises a liquid storage container, a centrifugal pump, a membrane lung, a first peristaltic pump, a leukocyte filter, a hemodialyzer and a waste liquid bag, wherein the liquid inlet end of the first peristaltic pump is communicated with the liquid storage container through a pipeline, the liquid outlet end of the first peristaltic pump is communicated with the liquid inlet end of the hemodialyzer through a pipeline, the liquid outlet end of the hemodialyzer is communicated with the liquid storage container through a pipeline, the waste discharge end of the hemodialyzer is communicated with the waste liquid bag through a pipeline, the liquid storage container, the first peristaltic pump and the hemodialyzer form a filtering circulation auxiliary path, and the leukocyte filter is arranged on the filtering circulation auxiliary path. According to the invention, when the leukocyte filter is blocked due to long-time work,the leukocyte filter can block the filtering circulation auxiliary path and cannot block the perfusion circulation main path, the perfusion circulation main path can still continue to work at the moment, the in-vitro organs can be continuously protected, and the leukocyte filter on the filtering circulation auxiliary path can be replaced in time.

The invention discloses a method and a device for regulating the emission surface of an ultrasonic transducer probe to be parallel to a reflecting plate. Two laser emitters are arranged at one side of the probe, and a laser receiving point sensor is correspondingly arranged on the reflecting plate. In actual application process, when the parallelism degree between the emission surface of the ultrasonic transducer probe and the ultrasonic reflecting plate deviates, and the upper, lower, left and right positions of the reflecting plate are repeatedly regulated till laser narrow beams emitted from the emission surface of the ultrasonic transducer probe realign to the laser receiving point sensor in the reflecting plate, thus the parallelism between the emission surface of the ultrasonic transducer probe and the reflecting plate can be determined. The invention has the advantages of convenient regulation, time and labor saving and high accuracy, reduces experiment preparation working intensity of instruction teachers and the experimental difficulty of students and improves the experimental efficiency and effect.

The invention provides a joint composition and application thereof. The joint composition comprises a first joint and a second joint, wherein the first joint is a single-chain joint and contains a UID(unique identifier) sequence and a segment of single-chain nucleotide; the 3'-end of the first joint has sealed modification; the second joint is a double-chain joint formed by a long chain of nucleic acid and a short chain of nucleic acid in complementary pairing; the 5'-end of the long chain of the nucleic acid of the second joint has phosphoric acid modification; and the 5'-end of the short chain of the nucleic acid of the second joint does not undergo phosphorylation modification. Since a synthesized joint with the UID sequence is directly introduced, and the UID sequence is introduced into a double-chain library through extension, a tedious joint preparation process in a conventional UID joint database construction technique is avoided, the experiment efficiency can be improved, theexperiment difficulties can be reduced, and the experiment cost can be reduced.

The invention provides a constant-speed blurred image construction method and device based on splicing of two frames of static images, belonging to an image movement analyzing part in the common image data processing or generating field. The method comprises the following steps of: deducing a blurred distance of a target under an actual condition according to the target in an actual scene, an optical system and parameters of an image sensor, and inversely deducing to an image space to obtain a distance of positions of the target in two spaces; and carrying out two times of imaging on a substituted target of the positions of the two spaces and constructing a constant-speed blurred image according to image information. The substituted target in the device comprises two parts including a static background and a movable target; and the movable target can do two-dimensional movement in a view field range of a substituted optical system in a direction which is vertical to an optical axis of the device. The method and the device can utilize a room-temperature visible light target to equivalently replace a high-temperature target; a low-speed movement is matched with two times of imaging to equivalently replace a high-speed movement, so that the experiment difficulty is reduced and the experiment safety is improved; and a plurality of groups of experiment data are easy to obtain and the experiment cost is greatly reduced.

The invention belongs to the technical field of a micro-fluidic chip, and in particular relates to a simple micro-fluidic chip for cytological analysis and a cell analysis method. The simple micro-fluidic chip comprises a basal layer and a cell culture layer which is arranged on the basal layer, wherein liquid storage tanks, which are located in a same plane, are arranged on the cell culture layer; a micro-channel is additionally arranged on the cell culture layer; and the bottoms of the at least two liquid storage tanks communicate by virtue of the micro-channel. The simple micro-fluidic chip is applied to cell culture and cytological analysis is carried out on cells cultured in the micro-channel of the micro-fluidic chip; and compared with an existing micro-fluidic chip, the micro-fluidic chip disclosed by the invention is easier to be adopted by general biology laboratories for processing and for the operations of cell culture and cell analysis.

The invention discloses a centrifugal pump fault diagnosis method and system. The method comprises the following steps that S1, a vibration signal of a centrifugal pump is obtained; S2, the vibrationsignal is preprocessed, and a denoising signal is obtained; S3, a time domain feature parameter and an energy feature parameter of the denoising signal are extracted; S4, a centrifugal pump diagnosissimulation experiment system is built, time domain feature parameters and energy feature parameters in different modes are obtained, and a fault detection model is built; S5, the time domain feature parameters and the energy feature parameters in the step S4 are integrated and subjected to dimensionality reduction, the time domain feature parameters and the energy feature parameters, subjected todimensionality reduction, of the to-be-detected centrifugal pump are detected by the fault detection model, the fault detection model outputs fault categories, the classification accuracy rate of thefault detection model can be effectively increased, and the fault categories and positions are distinguished.

The invention provides a light-fractured fluorescence-labeling reversible terminal compound and use thereof in DNA (Deoxyribonucleic Acid) or RNA (Ribonucleic Acid) sequencing. According to the light-fractured fluorescence-labeling reversible terminal compound and the use thereof in the DNA or RNA sequencing, a light-fractured group is adopted as an inhibition group, and the inhibition group is disconnected from a basic group under the irradiation of certain wavelength; the departure process does not need the assistance of special catalysts or reducers and the like, and side reaction of assistant reagents with DNA polymerase and the basic group cannot occur, so that reversible termination is realized under mild conditions; and in addition, the departure process is free of any interference to a sequencing process, so that sequencing for long-segment single molecules is facilitated.

The drive power supply in high frequency combined with piezoelectric transducer generates ultrasonic coupled to acousto-optic crystal. When ultrasonic passes through the acousto-optic crystal, refractive index of material is modulated by strain presents cyclic variation. Acousto-optic crystal possesses photon band gap. Following modulation, photon band gap is changed so as to become dynamic photon crystal.

The invention relates to an automatic continuous monitoring system for subway deep tunnel engineering construction safety, which belongs to the field of tunnel construction safety monitoring and earlywarning, and comprises a sensor unit, a data acquisition and transmission unit, a data processing and control unit and a construction safety evaluation program module, the sensor unit collects displacement, strain, settlement and inclination angle monitoring information; the data acquisition and transmission unit comprises a sensor wireless data transceiver and a wireless data relay transceiver and is used for wirelessly transmitting and receiving inclination angle monitoring information among all the units; the data processing and control unit comprises a computer, and the construction safety assessment program module performs wavelet packet analysis on at least one of displacement, strain, settlement and inclination angle monitoring information data when executed by the computer, and identifies the occurrence time, damage position and damage degree of tunnel structure damage. The method has the advantages of real-time performance, convenience, high efficiency and accuracy.

The invention discloses a passive light source monitoring method suitable for a twin-field protocol. The method comprises the following steps: acquiring signal light and idle light obtained by splitting a light pulse subjected to intensity modulation; dividing the idle light into two light beams, detecting the two light beams, and obtaining four different counting events according to a detection result; estimating the parameters of the signal light through four different counting events so as to obtain a safe coding rate under a untrusted light source. Parameters of devices in a light source monitoring module do not need to be adjusted, the experiment difficulty is reduced, and safety reduction caused by modulation errors is avoided. The method is introduced by taking a twin-field quantum key distribution protocol as an example, is not only limited to be applied to a quantum key distribution process of the twin-field protocol, but also is suitable for quantum key distribution and quantum communication processes involving an untrusted light source, such as a BB84 protocol and a measurement equipment irrelevant protocol.

The invention relates to a multi-working-condition power system performance prediction method based on Gaussian process regression, and the method comprises the following steps: 1), collecting conventional working condition data, preprocessing the data to acquire a training data set, and selecting a Gaussian regression process kernel function; 2) training a Gaussian process regression model, namely determining hyper-parameters of the Gaussian process regression model; 3) obtaining a next sampling point by adopting a sequential sampling algorithm, and adding the next sampling point into the conventional working condition data to obtain an augmented working condition data set; and 4) based on the prediction result and the augmented working condition data set, judging whether a stop condition is satisfied, if not, taking the augmented working condition data set as a new training data set and then returning to the step 2), and if so, outputting the prediction result. Compared with the prior art, the method has the advantages of low cost, multi-working condition and extreme working condition prediction and the like.

The invention relates to a method for accurately and efficiently testing contents of platinum and palladium in ore and belongs to testing methods for ore samples with platinum and palladium. The method comprises the following steps: enriching platinum and palladium in a sample by using a fire assaying method, carrying out simple grinding treatment on a lead buckle obtained by using the fire assaying method, cutting into a fine thread shape, dissolving lead threads conveniently with a nitric acid solution of 1:3, after the lead threads are dissolved and clarified, putting hydrochloric acid intothe solution so as to obtain an aqua regia system, continuously dissolving undissolved platinum and palladium, filtering so as to remove lead precipitate, fixing the volume of the filtrate, and testing the contents of platinum and palladium through ICP (Inductively Coupled Plasma). By adopting the method, a fire assaying ash blowing process is avoided, the cost is reduced, the recycling rate of the platinum and the palladium is increased, damage of lead smoke to the environment and human bodies is reduced, accurate and stable testing results are finally ensured, experiment steps are reduced,the testing accuracy is improved, and the working efficiency is effectively improved.

The invention belongs to the technical field of dynamic mechanics performance experimental equipment for materials and in particular relates to an electromagnetic spinning type split-Hopkinson torsional bar. The electromagnetic spinning type split-Hopkinson torsional bar comprises an incident bar, a transmission bar and test pieces and further comprises a cylindrical fixed frame, wherein the testpieces are arranged at adjacent ends of the incident bar and the transmission bar; the fixed frame is coaxially arranged at the overhanging end of the incident bar; a plurality of rotating blades arefixed on the incident bar; the rotating blades are pushed by a pulsed electromagnetic loader arranged on the inner side of the fixed frame; and the pulsed electromagnetic loader is electrically connected with a transient power supply pack and a control component. According to the split-Hopkinson torsional bar disclosed by the invention, the pressure is applied to the rotating blades by utilizing the pulsed electromagnetic loader, so that the defects of the conventional pre-energy storage type split-Hopkinson torsional bars, explosive-driven split-Hopkinson torsional bar devices and T-shaped split-Hopkinson torsional bar devices are overcome, the experimental difficulty is greatly reduced, and the experimental efficiency is greatly improved.