67results about How to "Result science" patented technology

The invention relates to a human-body health function-status evaluating model, relates to an evaluating method for comprehensively evaluating the functional level of a human body and belongs to the category of health evaluation. The construction of the evaluating model comprises the establishment of seven modules, i.e. a brain-cognizing function module, a metabolic function module, a traditional-Chinese-medicine symptom-identifying module, a psychological function module, a social-adapting function module, a cardio-pulmonary function module and a movement function module and the establishment of a specific testing project, an index system and a specific index under each module and a testing-project evaluating standard. The score evaluation of the whole module is finally obtained through each-step index evaluation, weight determination and calculation step by step. The integral comprehensive evaluation and the evaluating result of each module are all shown by corresponding evaluation reports. Functional-status levels in the aspects of physiology, psychology and social adaptation of the human body can be obtained through the health function-status evaluation of the human body, so that potential health hazards are found in advance, and intervention treatment is carried out as early as possible, so as to guarantee the physical and psychological function-status health of the human body.

The invention relates to a calculation and analysis method for testing cognitive competence values. The method at least comprises the following steps: obtaining feedback information input by a tester and collecting response information of the tester for stimulus information in the test process; obtaining test grades of at least two test dimensions which are used for evaluating the cognitive competence according to the feedback information; and generating a test sample on the obtained test grades of the test dimensions, and combining the test sample and the response information to obtain a test report. According to the calculation and analysis method for testing cognitive competence values, the cognitive competence is tested from 16 dimensions, so that the test dimensions are increased and the test correctness is improved; and proper norm groups are selected according to the related background information of the tester, so that the test result accords with the practical situation of the tester to a greater extent.

The invention discloses a method and device for detecting an abnormal user. The method comprises the steps that logs are acquired; the acquired logs are classified; the various classes are scored according to access parameters in the various classes, the classes with the scores ranking the first N are selected, and the logs in the N classes are taken as key logs; and group characteristics of the key logs are extracted according to a characteristic extraction algorithm, individual characteristics of a log of a target user are extracted according to the characteristic extraction algorithm, and whether or not the target user is an abnormal user is judged according to the similarity of the group characteristics and the individual characteristics. The device is independent of a real-time strategy system, has a longer time window and can obtain more accurate characteristics of the user.

The invention provides a flavor evaluation method for mushroom chicken soup. The method comprises the following steps: stewing mushroom chicken soup; performing sensory evaluation on acquired different mushroom chicken soup samples; performing amino acid and nucleotide determination on the acquired different mushroom chicken soup samples, analyzing the content of flavor materials in the different mushroom chicken soup samples and calculating the equivalent value of aginomoto; performing correlation analysis on data of the acquired different chicken soup sensory evaluation and the analysis for the content of flavor materials with PLS (Partial Least Squares) and comprehensively analyzing the flavor of the chicken soup samples, thereby comparing the difference of the flavors of different chicken soup. The flavor evaluation method for mushroom chicken soup provided by the invention is reasonable and comprehensive, can effectively evaluate the flavor difference of mushroom chicken soup and has important guiding significance for cooking mushroom chicken soup.

The invention discloses an automatic Fengshui evaluation method and an evaluation system used for a residential house type. The system can automatically calculate Fengshui rapidly and scientifically after a user puts forward a house type image and demonstrates a result to the user. An activity of Fengshui calculation, which is abstract and complex and can only be performed after professional training (studying the Book of Changes, studying comfort level of the house type, etc.) is simplified into a mode which can be intuitively felt by providing one house type image for common people via the system so that cost is reduced to zero and the more scientific and clearer result is obtained. Besides, the invention also provides a house type identification method which specially aims at computer automatic identification of gate orientation, bedroom direction, unfilled corners and opposite directions of doors and windows according to a house type profile image so that application of the method to other data acquisition fields requiring house type accurate analysis is facilitated.

The invention provides a fragrance difference comparison method for traditional Chinese medicine chicken soup. The method includes: 1) a step of stewing the traditional Chinese medicine chicken soup; 2) a step of performing sensory evaluation to different traditional Chinese medicine chicken soup samples; 3) a step of performing electronic nose analysis to the different traditional Chinese medicine chicken soup samples; and 4) a step of comparing and analyzing the volatile fragrance components in the different traditional Chinese medicine chicken soup samples by means of headspace solid phase micro-extraction-gas chromatography-mass spectrum combination. Through the PLSR, correlation analysis is carried out to qualitative and quantitative analysis data of the sensory evaluation and volatile fragrance components of the different chicken soup, and the fragrance of the chicken soup is further comprehensively analyzed, thereby comparing the fragrance different of the different chicken soup. The method is reasonable and comprehensive, can effectively compare the fragrance difference of the traditional Chinese medicine chicken soup, and has important guiding significance for production of the traditional Chinese medicine chicken soup.

The invention discloses a device for measuring the leaching loss amount of fertilizer and the water retaining effect of a soil water-retaining agent. The device comprises a soil box, a bracket, a sliding water-collecting disc and a filtering net which are connected together, wherein the soil box is separated into two tanks through a clapboard in the middle; a water inlet hole with the diameter of 3cm is formed in the upper part of one side of each soil tank; multiple drainage holes with the diameter of 2mm are formed in a bottom plate of the box; the filtering net is laid on the bottom plate of the soil box; the mesh diameter is small enough to prevent soil particles from leaking along with water; the bracket comprises four upright posts which are fixed through transverse moment, the distance between each two adjacent upright posts is 122cm, and each upright post is 40cm long; two chutes parallel to the opposite sides of the transverse moment of the bracket are welded at the part, which is 20cm away from the upper end, of the bracket; the bottom area of the water collecting disc is the same as that of the soil box, baffles with the height of 5cm are arranged at the periphery of the water collecting disc, the water collecting disc is separated into two parts through a clapboard in the middle, a group of scales is marked on the baffle at the periphery of each part, and the minimum measurement unit of the scales is 1mm.

The invention belongs to the technical field of wine brewing, and particularly relates to a quality evaluation method and system for strong-flavor distiller's yeast. The quality evaluation method is characterized by comprising the following steps: selecting a whole block of distiller's yeast from a strong-flavor finished distiller's yeast store, carrying out sensory quality evaluation, and determining the finished distiller's yeast with qualified sensory evaluation by seven indicators, namely the acidity, the moisture, the volume weight of the distiller's yeast block, the liquor-producing power, the esterifying power, the amino acid nitrogen and the starch conversion ratio; carrying out analysis and computation on the seven physical, chemical and biochemical indicators of the distiller's yeast sample by virtue of a principal component analysis method of SPSS13.0; selecting a few of previous principal components, determining the weights through the information proportion of various components, building a comprehensive evaluation model for the distiller's yeast quality, and then calculating quality characterization values F of each distiller's yeast through matlab software; carrying out clustering analysis on the values F, and then dividing the distiller's yeast quality into four grades. According to the method and the system, human disturbance factors are reduced; the method and the system are objective, scientific, simple and convenient to use, high in operability and accurate.

Disclosed is a guidance sign space arrangement evaluation method based on sight overlay analysis, which performs effect analysis on a visual area of human through overlay of dynamic sights of pedestrians in space to quantificationally evaluate the reasonability of the 'space arrangement'of the guidance sign. Firstly, the sight of a pedestrian is abstracted into a sector, the farther the distance, the larger the declination, and the worse the effect of space vision, secondly, a pedestrian flow line is obtained according to spatial prediction or in-situ observation, and a vision sector is formed according to each unit time to perform an overlay analysis of a sector sight of a single flow line, finally the flow rate of the pedestrian flow line is utilized as a weight to compute the vision effect of the multi-flow-line pedestrian visual area via weighting. The method makes up for the shortage that the guidance sign design is lack of evaluation tools, provides a quantitative basis for the 'design evaluation' and the 'post implementation review'of the space arrangement of the guidance sign, and has the advantages of coinciding with the cognitive law of pedestrians and being easy to be realized.

The invention discloses a triple co-generation multi-target optimizing method of a CCHP (combined cooling heating and power) system. The method comprises the steps of establishing an annular energy consumption model, establishing an annual operation expense model and establishing a pollution emission model in a mathematic model manner, forming a multi-target function through the three mathematic models to be used as an adaptive value of the algorithm, solving by utilizing a random fish swarm algorithm to obtain device capacity data, and designing a device procurement scheme of the CCHP system according to each device capacity data. The method reflects the Pareto optimal principle, all targets of the triple co-generation of the CCHP system reach the optimal resource allocation, and various device procurement schemes can be provided for a decision maker.

The invention discloses a vibration signal fault identification method of a rotating machine, which includes fault type discrimination, fault feature extraction, fault index refinement, and fault mode recognition. The characteristics of the fault vibration signal are processed, and the signal is calculated and analyzed through a mathematical process to identify the fault of the signal. Therefore, the result is more accurate and scientific.

The invention relates to a school comprehensive energy system technical economy evaluation method and system, and the method comprises the following steps: constructing a technical economy evaluationindex system of a to-be-evaluated project, wherein the evaluation index system comprises 10 indexes in the aspects of technology, economy and environment, 8 indexes are quantitative indexes, and 2 indexes are qualitative indexes; inputting the evaluation indexes into an established technical economy evaluation model, wherein the technical economy evaluation model comprises the weight and evaluation method of each index; and determining the weight by adopting an order relation analysis method and an anti-entropy weight method, and evaluating the technical economy of the school comprehensive energy system by applying a TOPSIS method of introducing the weight. The school comprehensive energy system technology economy evaluation method and system can scientifically and reasonably evaluate theschool comprehensive energy technology economy, and have high use value.

The invention provides a humid and hot environment adaptability quantitative evaluation method for a charging pile complete machine. The method comprises the following steps: (1) extracting the charging pile complete machine which is produced in batch, and installing the charging pile complete machine in a natural exposure test field in a humid and hot environment for a static natural exposure test; (2) respectively carrying out weather resistance failure evaluation, module operation evaluation and severe working condition evaluation on the charging pile in the static natural exposure test process; obtaining a weather resistance failure evaluation score, a module operation evaluation score and a severe working condition evaluation score; and calculating a damp and hot environment adaptability comprehensive score of the whole charging pile by combining respective weights of weather resistance failure evaluation, module operation evaluation and severe working condition evaluation, completing damp and hot environment adaptability evaluation of the whole charging pile, and providing basic data for improvement or use of the charging pile according to the comprehensive score. A natural exposure test is utilized, influence factors in the actual application process of the charging pile are considered, and quantitative evaluation of the damp and hot environment adaptability of the wholecharging pile is achieved.

The invention belongs to the field of horticulture, and particularly relates to a method for identifying and evaluating cold resistance of ramie germplasm resources. In order to evaluate the cold resistance of ramie rapidly, accurately and easily, researchers screen multiple indexes such as physiological indexes, ecological indexes and morphological indexes, but it is found in research that most of the indexes have no relationship with plant mortality, and direct evaluation on the cold resistance of the ramie through the indexes is difficult. According to the method for identifying and evaluating the cold resistance of the ramie germplasm resources, operation is easy, evaluation and classification data are stable and reliable, and the defect that ramie germplasm can not be identified accurately under the natural environment is overcome; time limit does not exist, and ramie germplasm cold resistance identification can be conducted from late February to mid October; the evaluation and classification of the cold resistance on the ramie germplasm resources are facilitated, and screening of ramie germplasm which has the cold resistance and selection of ramie varieties which have the cold resistance are facilitated.

The invention discloses a fuzzy mathematics vector partition evaluation method and device, and relates to the technical field of geographic information systems. The method includes: determining evaluation factors according to the evaluation purpose, establishing an evaluation database according to the evaluation factors; determining the weight coefficient of each evaluation factor , establish a weight set; draw each evaluation factor thematic map according to the evaluation database; scale each evaluation factor to obtain the membership degree value of the comprehensive evaluation; carry out spatial superposition on each evaluation factor thematic map to obtain a comprehensive thematic map, and the The comprehensive thematic map is processed to obtain a comprehensive evaluation zoning map, and a comprehensive evaluation value is obtained according to the comprehensive evaluation zoning map. The invention uses the GIS platform to process and superimpose the graphic elements, so that the analysis results have clear boundaries; and the fuzzy mathematical analysis is used as the theoretical basis to make the analysis results more scientific.

The invention discloses a method for evaluating the real abrasion resistance of diesel, which comprises using a plunger injection pump to inject diesel via an injector into an oil tank, circulating the oil in the oil tank via the plunger injection pump and the injector, measuring the plunger mate part pressure keeping time of the plunger injection pump after some operation, using the difference of the plunger mate part pressure keeping times before and after operation to represent the real abrasion resistance of diesel. The invention further discloses a bench test device, which mainly comprises a plunger injection pump and an oil tank driven by a drive device, wherein the oil tank via a circulating oil line is connected with the oil inlet of the plunger injection pump, and the invention further comprises a timer for testing operation time. The invention method is simple and easy, which can represent real abrasion resistance of diesel.

The invention discloses a method and a device for determining the proton treatment dosage and range by using proton induced thermoacoustic signals. The method includes: receiving a proton induced thermoacoustic signal through an ultrasonic sensor, and analyzing the proton induced thermoacoustic signal and extracting the travel time and waveform information; performing ray tracing on a propagationpath of the proton induced thermoacoustic signal in a body, and calculating the minimum travel time of a first arrival wave; using the perturbation method to determine a partial derivative matrix of the travel time to a position of a thermal sound source, and establishing an inversion equation; obtaining the position of the thermal sound source and a velocity model through iterative fitting; solving the problem of double coupling of thermal sound source position disturbance and velocity model disturbance by using the parameter separation method; further correcting the position of thermal soundsource and the velocity model that the proton induced thermoacoustic signal is propagated in human body through the disturbance; and determining the dosage and the range of proton treatment through aproton beam energy distribution relationship. The experimental results obtained by the invention not only save the running time but also ensure the positioning accuracy; and the method and the devicecan be widely applied in proton treatment.

The invention provides a device and a method for measuring the location of center of mass based on a forward tilting platform and a wheel load meter. When the traditional wheel load meter is used formeasuring the height of the center of mass, the front axle wheel is lifted, and the height of the center of mass is calculated according to the lifting height and the weight change of the back axle; when the height of the center of mass of the heavy and multi-axes vehicles is measured, the load on the back axle is too large, and the measuring cannot be performed. The device is characterized in that multiple wheels are used for simultaneously loading, so as to measure the height of the center of mass of the heavy and multi-axes vehicles. The device for measuring the location of the center of mass based on the forward tilting platform and the wheel load meter consists of a driving cylinder (1), a loading platform (2) and the wheel load meter (3), wherein the bottom part of the driving cylinder is connected with a ground foundation through a bolt; the top part of the driving cylinder is used for supporting the loading platform; the lower part of the loading platform is connected with a connecting hinge (4). The device is used for measuring the locations of the centers of mass of automobiles and engineering vehicles.

The invention discloses a dual random-based extracting system, method and device. The system comprises a processing module and a storage module. The method comprises the steps that the processing module processes data according to a user operation request; the storage module stores user operation request information and a data processing result; the processing module randomly extracts case sourcesaccording to transactional consistency comments based on the data stored in the storage module, and randomly extracts law enforcement officers according to the transactional consistency comments andan avoiding mechanism for suspicion-avoiding personnel based on the data stored in the storage module and the randomly extracted case sources; and the dual random-based extracting device comprises a memory and a processor. The case sources and the law enforcement officers are randomly extracted according to the transactional consistency comments, so transaction consistency can be guaranteed and working efficiency can be improved; the law enforcement officers are randomly extracted according to the avoiding mechanism for suspicion-avoiding personnel, so a random extraction result can be more scientific; and the dual random-based extracting system, method and device can be widely applied to the application field of computers.

The invention relates to a human apoptosis factor quantitative antibody chip and a kit. A buffer liquid capable of being mixed with various standard proteins is prepared; a protein extraction reagent capable of effectively extracting proteins and ensuring that the proteins keep excellent activity is prepared; and whether a color indicator is added to the antibody so as to prevent errors of missing addition or less addition in detection is detected. The method for preparing the human apoptosis factor quantitative antibody chip specifically comprises design of the antibody chip, processing of a glass slide, chemical modification of the glass slide, quality examination of the antibody, determination of optimal concentration of capture antibodies and detection antibodies, micro-array spotting of the antibody chip, sealing of the antibody chip, mounting of a multi-sample fence, quality control of the antibody chip, and packaging and putting in storage. The application of the human apoptosis factor quantitative antibody chip kit is oriented to detect the expression condition of the human apoptosis factor in diseases. The human apoptosis factor quantitative antibody chip provided by the invention is higher in detection flux, better in flexibility, smaller in detection background, higher in specificity, more scientific in operation and more convenient for detection.

The invention belongs to a wheat radiation breeding method, in particular to a 60Co-Gamma radiation method for breeding a new wheat high-molecular-weight glutenin subunit line. Reports on the 60Co-Gamma ray breeding of a new wheat high-molecular-weight glutenin subunit mutant line in the prior art are not seen. The method includes the following steps: wheat seeds are irradiated by 60Co-Gamma rays for ten minutes, and the dosage rate is 200Gy; a first mutagenized generation is produced; seeds of a second mutagenized generation are produced; individuals of the M2 generation are grown and harvested; the wheat glutenin of the M2 generation is extracted by the half-seed method, and protein electrophoresis is carried out; half seeds are grown, and a third mutagenized generation is harvested; the wheat glutenin of the M3 generation is extracted; M3 protein electrophoresis is carried out; and the new mutant line with different number of high-molecular-weight glutenin subunit bands or high-molecular-weight glutenin subunit bands at different positions is determined by comparing with the parents. The method has the advantages that: the method breeds the new wheat high-molecular-weight glutenin subunit mutant line by combining 60Co-Gamma ray radiation with the electrophoresis and combining the field planting with indoor electrophoresis screening; and the result is accurate, scientific and reliable.

The invention belongs to the technical field of geographic information systems, and discloses a shortest time path planning method capable of predicting a dynamic space-time environment, which comprises the following steps of: 1, quantifying various environmental factors influencing the advancing speed; 2, comprehensively evaluating the influence of various environment factors on the advancing speed, and constructing a dynamic space-time environment influence rule expression model capable of expressing the whole space-time environment according to the environment influence expression rule of any space at any moment; and 3, on the basis of the constructed dynamic space-time environment influence rule expression model, evaluating the consumed time of linear movement between any two adjacentpoints, and on the basis, planning a continuous movement track from a starting point to a target point according to the principle of minimum cost by adopting a path search algorithm and taking the time as cost. According to the invention, the path planning result can reflect the dynamic influence in the continuous change process of the environment, and the operation burden is not significantly increased.

The invention relates to a quantitative analysis method of a built small hydropower station power generation capacity evaluation index system suitable for investment risk evaluation. Currently, an evaluation method suitable for the built small hydropower station power generation capacity needs to be provided in order to provide decision-making help for built small hydropower station investment. The method is characterized by including the following steps that 1), static and historical operating data of a small hydropower station and relevant benchmarking indexes in regions are collected, in combination with the power generation characteristics and current situation of the small hydropower station, indexes capable of reflecting the power generation capacity of the small hydropower station are determined, and the evaluation index system is established; 2), the weights of all indexes in the evaluation index system are determined through a subjective weighting method; 3), on the basis, anevaluation method and an evaluation standard are determined to evaluate the power generation capacity of the small hydropower station. The method is used for evaluating the power generation capacity of the small hydropower station, the index system is simple, high practicality is achieved, and decision-making support is provided for following small hydropower station integrated investment risk evaluation.

The invention provides application of a product for detecting ddcfDNA in preparing a product for detecting transplanted kidney injuries caused by pulmonary infection and evaluating a prognosis effect,the product for detecting the transplanted kidney injuries caused by pulmonary infection and evaluating the prognosis effect, and a method for detecting the transplanted kidney injuries caused by pulmonary infection and evaluating the prognosis effect. The product for detecting the ddcfDNA can detect the level of the donor free cfDNA (ddcfDNA) in plasma of a kidney transplant recipient, accordingto the level of the donor free cfDNA (ddcfDNA), the transplanted kidney function injuries caused by pulmonary infection are diagnosed, the prognosis effect is evaluated, the early diagnosis of the transplanted kidney injures caused by pulmonary infection and the prognosis effect for the organ transplant recipient after an operation can be achieved, the product for detecting the ddcfDNA has the advantages of rapidity, accuracy and high sensitivity, the detection method is non-invasive, and the pain of the patient is greatly reduced.

The invention provides a visual perception evaluation system and method suitable for children. The visual perception evaluation system comprises a supporting unit, n clamping tools which play roles in fixing, m detecting units and an evaluation unit, wherein the n is larger than or equal to 1 and m is larger than or equal to 1; the detection units which are objects with colors are fixed on the supporting unit through the clamping tools; the evaluation unit which comprises a visual perception evaluation scoring tool, a scoring principle and an evaluation report generation unit is used for evaluating action performances of a to-be-evaluated-person; the detection units are provided with various colors. The visual perception evaluation system has the advantages of enhancing pertinence of visual perception evaluation, providing the specific scoring standard, reducing subjectivity of evaluation of visual perception abilities and enabling the evaluation process and result to be scientific, objective and accurate due to the fact that the evaluation is performed through professional sensory integration teachers.

The invention discloses a cable insulation degradation type discrimination method and system based on a fuzzy evaluation method, and the method comprises the following steps: obtaining the complex polarizability x* of a to-be-tested cable through an FDS test, wherein the complex polarizability x* comprises a real part x and an imaginary part x; by a parameter extraction method of an improved H-N model, obtaining polarization xre, direct current conductance dc and jump conductance Delta according to the obtained complex polarizability x*; and judging the insulation degradation type of the cableto be tested based on a fuzzy evaluation method according to the obtained polarization re, direct current conductance dc and jump conductance Delta. According to the cable insulation degradation typediscrimination method, accurate identification of the degradation type of the XLPE cable can be realized.

The invention belongs to the technical field of medical detection, and provides an application of a product for detecting donor-driver cell-free DNA (ddcfDNA) in the preparation of a product for detecting BKVAN, a product for detecting BKVAN and a method for detecting BKAN. The product for detecting ddcfDNA can detect the level of ddcfDNA in urine of an organ transplant recipient, such as a renaltransplant recipient, diagnose whether the organ transplant recipient is a BKVAN or a BKVAN high-risk patient according to the level of the ddcfDNA and realize an early diagnosis of postoperative BKVAN in the organ transplant recipient, and has the advantages of rapidness, accuracy and high sensitivity. The detection method is noninvasive, and greatly reduces the pain of patients.

The invention provides a method, apparatus and device for evaluating layout suitability of a self-service library by multiple factors. The method comprises the following steps: obtaining a polynomialof a spatial layout suitability evaluation model of the self-service library; reading a plurality of pieces of questionnaire survey data, and resolving the polynomial of the self-service library spacelayout suitability evaluation model through the questionnaire survey data to obtain an accurate self-service library space layout suitability evaluation model; acquiring a population density gratingimage and a road accessibility factor grating image of a target area, and determining a theoretically appropriate spatial arrangement position of the self-service library in combination with the spatial arrangement suitability evaluation model of the self-service library; and obtaining the actual spatial arrangement position of the self-service library in the target area, and comparing and analyzing the actual spatial arrangement position with the theoretically suitable spatial arrangement position of the self-service library to obtain a conclusion. Based on the method, the GIS spatial analysis method is used for spatial arrangement research of cultural infrastructure, and the maximum convenient life can be provided for communities.

The invention discloses an SDN-based access point decision method under a space-ground integrated network authentication architecture. The method comprises the following steps: screening access pointsto generate a candidate access point set; normalizing the sample; solving an attribute weight matrix; evaluating the candidate access points by using TOPSIS and RSR algorithms; weighting the two evaluation results, and arranging the candidate access point samples in a descending order according to the weighting results; and selecting the first n candidate access point samples as access points according to the access request number n. According to the invention, the SDN is introduced into an access authentication process in a space-ground integrated network scene; the access authentication efficiency and success rate are improved by optimizing the access point selection method, the two evaluation methods are combined, interference of abnormal values is avoided under the condition that original data information is not lost, meanwhile, the application range is expanded, and access point decisions are more scientific and comprehensive. By comprehensively considering the multi-dimensionalattributes and selecting the most ideal access point, the access efficiency and the resource utilization rate can be effectively improved.

The invention relates to a negative pressure type device for measuring the density of an object. The negative pressure type device comprises a cylinder, a weighing table, a piston, a pressure sensor, a measured object temperature sensor and a gas temperature sensor, wherein the cylinder is placed on the weighing table; a piston capable of moving up and down is arranged at the top of the cylinder body; the pressure sensor, the gas temperature sensor and the measured object temperature sensor are arranged in the cylinder body and are communicated to the outside of the cylinder body; a tension device is arranged on the piston. The negative pressure type device for measuring the density of the object realizes measurement on the densities of objects with different states, different shapes and different characteristics under different temperatures according to the density measurement principle and based on the Clapeyron equation of ideal gas, and has the characteristics of scientific principle, simple structure, high easiness in operation and accurate result.