77results about How to "Avoid bias in results" patented technology

The invention discloses a method for assessing insulation aging state of a cable. The method comprises the following steps: slicing a cable sample, performing thermal ageing at two temperature points of 140 DEG C and 160 DEG C, taking out the sample after completely ageing and standing by for 24h at room temperature; performing tensile test, differential scanning calorimetry test, infrared spectroscopy test and thermal gravity test on the sample after ageing, and acquiring the related data parameters; and representing the insulation aging state of the cable according to the data parameters, so as to assess the insulation aging state of the cable. According to the method for assessing the insulation aging state of the cable, provided by the invention, the result deviation caused by measurement error can be avoided and the assessment for the aging state is more accurate.

The invention discloses a method for simultaneously detecting the content of four heavy metal elements in tobacco leaves. The method comprises the steps of standard solution preparation, sample pretreatment and sample analysis. According to the invention, a tobacco leaf sample is subjected to pretreatment by adopting a closed microwave digestion technology, so that the method disclosed by the invention has the advantages of short digestion time, accuracy and completeness in digestion and capability of effectively avoiding result deviation and environmental pollution caused by heating and volatilization compared with the conventional digestion methods such as a dry ashing method and an acid digestion method; As, Cd, Hg and Pb can be detected simultaneously, so that the problems on the decomposition of the sample and the interference of residual organic matters are effectively solved, and element detection limit is obviously reduced compared with that of other methods; the method disclosed by the invention has the characteristics of high accuracy and density, low detection limit, short analyzing time, simultaneous detection of a plurality of elements and the like, and can be used for detecting a plurality of samples to be analyzed; and moreover, sample detection quality and efficiency is increased to a larger extent.

The invention discloses a method for calculating the traffic capacity in a city expressway entrance interlacing region, and aims at filling a gap that there is short of a calculation method for effectively estimating the traffic capacity. The method comprises the following steps: 1, collecting related traffic parameters of an expressway interlacing region: 1), the mean time headway (shown in the description) of the traffic flow of an expressway trunk line Ls; 2), a critical time gap tC which allows ramp vehicles to merge into the expressway trunk line Ls; 3), the time headway th between two ramp vehicles; 4), the flow Q of the expressway trunk line Ls; 5), the distance L between a nasal tip N and a merging point of an accelerating vehicle La; 6), the design speed V1 of the expressway trunk line Ls; 7), the design speed V of a ramp; 2, calculating the probability distribution parameter K of the time headway of the expressway trunk line Ls; 3, building a method for calculating the traffic capacity of the ramp R; 4, improving the method for calculating the traffic capacity of the ramp R; 5, calculating the traffic capacity of the interlacing region through employing a formula (shown in the description), wherein CM is the traffic capacity of the interlacing region, the unit is vehicles/hour, and delta t is the time different of the ramp vehicle M2 and a trunk line vehicle M1 (unit is second).

The invention discloses an oil storage tank area fire explosion risk assessment method based on a fuzzy fault tree, specifically relates to the technical field of risk assessment. The method comprisesthe steps of S1, accident tree analysis: starting from a possible event, analyzing trigger events, direct reasons and indirect reasons causing an accident layer by layer, analyzing mutual logic relationships of the accident reasons, and representing the reasons and the logic relationships by using a logic tree diagram, and the analysis steps are as follows: the oil storage tank area is evaluatedby adopting the accident tree, the analytic hierarchy process and the fuzzy comprehensive evaluation; dangerous factors of an oil storage tank area is identified, an accident tree is constructed, structural importance analysis is carried out, an evaluation set of fuzzy comprehensive evaluation is scientifically selected, fuzzy comprehensive evaluation is carried out, the danger level of the tank area is evaluated, factors influencing the occurrence of accidents are comprehensively considered, the oil storage tank area is accurately evaluated, and the accuracy of risk evaluation is improved.

The invention relates to a method for calculating the static strength of a cabin door structure and belongs to the field of airplane structures strength design. Static strength calculation is performed based on a linear contact analysis method, and a finite element model of the cabin door structure is firstly established; according to the cooperative relation of the cabin door structure and an airplane body structure, boundary conditions are determined; then, the loading conditions applicable to constraint conditions of the cabin door structure are determined according to the boundary conditions, finally constraint of a linear contact analysis model is performed, a constraint control file is established, and finally the result of linear contact constraint reaction is calculated. By comparing a calculation result of linear contact analysis with a calculation result of nonlinear contact analysis, the static strength of the cabin door structure can be more conveniently, quickly and accurately calculated through linear contact analysis.

The invention relates to a monitoring method for natural reproduction of fish based on environmental DNA technology. The method comprises the following steps: acquisition of a water sample; DNA extraction; ddPCR amplification of a target fragment; and concentration analysis. The monitoring method provided by the invention is based on environmental DNA identification technology, does not depend on traditional fishing technology for roe and fries and traditional anatomical technology for oophagous fish and can determine the oviposition behavior of a target species and the position of an oviposition site only through reasonable design of a sampling point, acquisition of a water sample and concentration analysis of the target species. The method maximally protects fish resources and avoids inconvenience caused by restrictive factors like long time for traditional fishing and difficulty in fishing of a part of fish fingerlings.

The invention discloses a detection kit and a method for copy number of spinal muscular atrophy pathogenic gene SMN1 based on a real-time fluorescence quantitative PCR (Polymerase Chain Reaction) technique. The detection kit comprises specific primers SMN1-F (SEQ ID NO.1) and SMN1-R (SEQ ID NO.2) modified by NO.7 exon locked nucleic acid of a pair of target genes SMN1, an SMN1 detection probe (SEQID NO.3), an SMN2 gene closed probe SMN2-B (SEQ ID NO.4) modified by SMN-P locked nucleic acid and 3'end C3Spacer, gene primers ALB-F (SEQ ID NO.5) and ALB-R (SEQ ID NO.6) of a reference gene ALB andan ALB detection probe ALB-P (SEQ ID NO.7). The amplification specificity and amplification efficiency of the SMN1 gene are enhanced by using locked nucleic acid modification; a stable reaction system for double amplification of the target genes and the reference gene is established by using a multi-PCR principle and optimizing reaction systems and conditions, and further quantitative accuracy and reliability of the copy number of the SMN1 can be ensured; good repeatability and high operability are obtained.

The invention provides a method for evaluating the service life of the polyolefin cable insulation material for a nuclear power station. The method comprises the following steps: firstly, carrying outirradiation crosslinking and then carrying out plate vulcanization treatment simulation to obtain a cable insulation sample for the nuclear power station. Carrying out accelerated thermo-oxidative aging treatment on the obtained sample at different temperatures for different times, and simulating a cable aging process; Meanwhile, mechanical properties, insulating properties and infrared microcosmic parameters are obtained, and the aging state is represented. According to an elongation at break method, obtaining corresponding aging end point time tau1 at different temperatures T1. And carryingout DSC non-isothermal oxidation induction test on the obtained sample by adopting different heating rates, and calculating the activation energy of the cable insulation sample by adopting a Kissigerequation. And deducing a linear equation between the service life tau2 of the cable insulation sample to be tested and the reciprocal of the absolute temperature of accelerated aging by combining anArrhenius equation. The technical problems that an existing single-factor elongation at break method for evaluating the service life of the cable is short and not accurate enough are solved.

The invention provides a method and a device for obtaining a subject vocabulary entry. The method comprises the following steps of: S1, obtaining search keywords from a user search log; S2, taking nouns or phrases which point to a certain entity as a central word set; S3, taking words or phases which are used for describing the property of one aspect of the entity as a marker word set; and S4, taking vocabulary entries which are formed by utilizing the vocabulary entries in the centre word set and the marker word set and are in the form of 'central words+marker words' as a candidate subject vocabulary entry set; and filtering the candidate subject vocabulary entry set to obtain a subject vocabulary entry set, wherein the step of filtering the candidate subject vocabulary entry set comprises the specific steps of: judging whether the vocabulary entries appear in the search keywords or not and removing the vocabulary entries which do not appear in the search keywords. Compared with the prior art, manual editing is not needed when the subject vocabulary entry is obtained, so that the result deviation is small and the accuracy is high.

The invention provides a testing method of electrotinning uniform plating capacity. The testing method comprises the following steps of: processing a near cathode and a remote cathode in an electroplating bath by oil removing and micro-etching, and then drying; weighing to obtain the weight m1 of the near cathode and the weight m2 of the remote cathode; connecting the cathode to the positive pole of a rectifier; connecting the near cathode and the remote cathode to the negative pole of the rectifier; turning on a current to start electroplating; then drying the near cathode and the remote cathode after the electroplating; then weighing to obtain the weight m1' of the electroplated near cathode and the weight m2' of the electroplated remote cathode; and calculating the uniform plating capacity. The testing method provided by the invention is simple; two cathode plates are weighed after being carried out same pre-processing and drying during a test, so that the bias of a result due to chemical dissolving of an oxidizing layer can be avoided; and an accurate testing result is achieved.

The invention provides a device for detecting occluded foreignsubstances in the aluminum and aluminum alloy fused mass, which belongs to the field of casting technique. The invention is composed of a temperature controlling system, a filtering system, a vacuum system, a real time weighting system and a computer. The temperature controlling system is equipped around the filtering system, the vacuum system is under the filtering system which is tightly coupled with the filtering system, the filtering system is equipped in the temperature controlling system and above the vacuum system, the weight sensor part of the real time weighting system is in the vacuum system and under the filtering system, the controlling part of the real time weighting system is outside the vacuum system and is connected with the computer, which outputs weight signal for the computer; the computer is respectively connected with temperature controlling system, vacuum system and real time weighting system. The invention can control temperature accurately, which avoids error caused by temperature difference, the control system is easy to operate, the function is stable, the invention can give detection result on line rapidly, which can analyze occluded foreignsubstance in aluminum fused mass effectively.

The invention discloses a testing method of the content of nickel in a cathode material for a lithium ion battery. The testing method comprises the following steps: S01: weighing a cathode material for a to-be-tested lithium ion battery, adding acid for dissolution and heating for evaporation and realizing constant volume; S02: adding concentrated nitric acid into test fluid prepared in S01, then fractionally adding an excessive amount of potassium chlorate or sodium chlorate and filtering after a reaction is completed, so as to obtain filtrate and manganese dioxide sediment; S03: quantitatively measuring the filtrate in S02, adding water, ammonium chloride solution and tartaric acid solution, uniformly stirring the mixture and performing a complete reaction; S04: filtering the mixed solution to obtain filtrate and nickel dimethylglyoxime sediment, drying to constant weight and weighing; S05: calculating the content of a nickel element. The invention provides the testing method, so that the problem of an error existing in a process of testing the content of nickel in the cathode material for the lithium ion battery by using a spectrophotometric method and a chemical titration method can be solved, and the accurate numerical value of the content of nickel in the cathode material can be obtained.

The invention discloses a detection reagent, a detection method and a detection instrument for proteins. The reagent is prepared by the following steps: dissolving 0.1 to 10 weight parts of acid orange-12 into 1 to 500 weight parts of buffer solution of phosphoric acid; adding 1 to 500 weight parts of glacial acetic acid; and finally, diluting with 1 to 5,000 weight parts of water, and oscillating and mixing to obtain the detection reagent for the proteins. Compared with the traditional method, the detection method can effectively detect the content of true proteins, and detect the proteins in a wide range; and the detection accuracy is basically not interfered by non-protein nitrogen-containing compounds such as carbamide and melamine. The instrument has small structure, and is convenient to carry. The detection reagent, the detection method and the detection instrument can be widely applied to quick detection of milk products in the basic level and on the spot.

The invention discloses a method for identifying a sample type or a fault type and a biosensor device. The method is used for identifying whether a to-be-tested sample is a quality control solution ora blood sample or identifying a fault type of an electrode type blood detection device. The method comprises the following steps that 1, a sine alternating voltage is applied between a first electrode and a second electrode of the electrode type blood detection device, an alternating impedance value between the first electrode and the second electrode is measured, the amplitude of the sine alternating voltage is 0.1-0.3 V, and the frequency of the sine alternating voltage is 1000-3000 Hz; 2, the obtained impedance value is compared with a preset impedance threshold interval, and the impedancethreshold interval to which the impedance value belongs is determined; and 3, the type of the to-be-tested sample or the fault type is determined according to the threshold interval to which the impedance value belongs. The method is advantaged in that technical problems that an existing manual quality control liquid adjusting mode may cause misoperation, a fault of a detection device causes result misjudgment, and an electrode fault type cannot be quickly recognized in the prior art are solved.

The invention relates to a novel isothermal loop-mediated yersinia pestis nucleic acid mark detection reagent. A front inner primer in a primer group for isothermal loop-mediated amplification is used for marking an antigen, and meanwhile, a rear inner primer in the primer group is used for marking another antigen, so that a yersinia pestis specific target gene can be simultaneously amplified and marked. A matched colloidal gold strip can be used for rapidly detecting an amplification product of the target gene after marking, thereby detecting yersinia pestis. The detection reagent can be simply and rapidly operated, and is high in specificity and sensitivity.

The invention discloses a method for rapidly detecting free toluene diisocynate in a polyurethane coating. The detection method is carried out by adopting gas chromatography under specific test conditions, and comprises the steps of 1) saturating a chromatographic column and quartz wool in a liner tube by adopting a toluene diisocyanate solution with the mass concentration of 2.5-3.5% so as to enable the chromatographic column and the quartz wool to reach an analysis state; 2) respectively carrying out gas chromatographic analysis on a first calibration solution and a second calibration solution to obtain two different correction factors, wherein the contents of toluene diisocynate in the first calibration solution and the second calibration solution are different; and 3) carrying out gaschromatographic analysis on the sample solution, and calculating according to a formula. The method provided by the invention has the advantages of convenience, rapidness, low detection cost, high accuracy and short test time, and has the capability of accurately carrying out batch analysis.

The invention provides a method for determining nickel-based single crystal high-temperature alloy residual segregation. By means of a manufactured metallographic specimen, primary dendrite distance of nickel-based single crystal high-temperature alloy is measured, and mass fraction distribution of all elements on all points of the nickel-based single crystal high-temperature alloy are measured on the manufactured metallographic specimen through a dot matrix method. The segregation directions of the elements are determined according to obtained mass fractions of the elements on the measurement points. A computer simulates solution treatment to obtain distribution of the elements after solution treatment, and accordingly the residual segregation ratios of Al, Ta, W and Re elements are obtained respectively. According to the method, experiments and simulation are combined so that residual segregation of the high-temperature alloy can be accurately and quickly predicted after solution treatment, cost of solution treatment research is reduced, and the period of solution treatment research is shortened. The mode that the mass fraction distribution of the elements on the points is obtained through the dot matrix method has the advantage of being large in specimen number, and result deviation caused by large errors in common representing methods is prevented.

The invention relates to a multi-ring test sheet for rapid microbial detection, an aseptic culture medium contained in the test sheet and a preparation method of the aseptic culture medium and belongs to the technical field of microbial inspection. The multi-ring test sheet comprises a bottom board, an upper cover and the aseptic culture medium. The bottom board and the upper cover are in multi-ring toothed structures having fitting shapes and allowing top-bottom engagement. The middle of the multi-ring toothed structure of the bottom board is recessed to form a culture chamber; correspondingly, the middle of the multi-ring toothed structure of the upper cover is raised to form a culture chamber cover. The bottom of the culture chamber is 30-80 degrees angled to its side, a highest point of this side is not less than 0.3 cm perpendicular to the bottom, the culture chamber is used for holding the aseptic culture medium, and the aseptic culture medium is gel separate aseptic culture medium or electrostatic absorption culture medium. The detection is simple and quick, the multi-ring toothed structures are effective in keeping the medium free of moisture loss, gaseous ingredients required by microbial growth are provided, and the development of microbial detection is facilitated.

The invention provides a method of analyzing insulating material performance by using three-parameter Weibull distribution to process flashover voltages. The method comprises the steps of collecting n flashover voltages, arranging the voltages in an ascending order, building a voltage vector U and assigning failure ordinals; establishing a three-parameter Weibull distribution flashover voltage probability model; calculating the corresponding accumulated flashover probabilities of the flashover voltages under the failure ordinals; fitting the scale parameter, the shape parameter and the position parameter in the three-parameter Weibull distribution flashover voltage probability model; analyzing insulating material performance by using the three-parameter Weibull distribution flashover voltage probability model. The three-diameter Weibull distribution is employed to process flashover voltage data and calculate the flashover probabilities and thus is closer to the actual condition compared with that based on two parameters, is better in fitting effect and higher in accuracy; the failure level concept is employed for calculating the accumulated flashover probabilities and a medium rank formula is used for correcting the failure level, so that the problem of result deviation caused by insufficient samples is solved; the calculation is simple and the operating speed is high; the method can be used for flashover voltage prediction and the insulating design standard is determined according to the flashover probability requirement.

The invention discloses a method for calculating critical injection pressure of fluid in a nanopore throat. The method comprises the following steps: 1) constructing a nanopore throat structure; 2) constructing a fluid and a push plate; 3) adjusting the size of the model, setting a vacuum area, and finishing model construction; 4) distributing force field and charge parameters; and 5) carrying outmolecular mechanics optimization, balanced molecular dynamics simulation and tensile molecular dynamics simulation, counting and analyzing the stress change process of the oil phase in the nanopore throat filling process, and obtaining the critical injection pressure of the oil phase in the nanopore throat filling process through a formula P = F/S. According to the invention, a computer simulation technology is utilized to obtain the calculation method of the critical injection pressure of the fluid in the nanopore throat; the result deviation caused by ignoring the intermolecular interactionin the mathematical calculation method is avoided, the method can realize the regulation and control of the simulation conditions such as the nanopore throat size and the fluid components, and a convenient and effective way is provided for the research of the critical physical properties of the unconventional oil and gas reservoir.

The invention relates to a kit for determining an anti-Jo-1 antibody. The kit comprises a first reagent, wherein the first reagent comprises a mixture coupled with biotin. The mixture comprises a Jo-1antigen and a tRNA. According to the kit and the detection method for determining anti-Jo-1 antibody, the invention has the advantages of good stability, high sensitivity, good repeatability and thelike; a detection system can realize random sample loading, freely combination and continuously detecting, and the detection time is greatly reduced that 120 tests can be completed within 1 hour; andoperations are simple and convenient, a full automatic detection is truly realized, and the result deviation caused by the operations is avoided. Compared with a traditional method, the detection result of the invention is consistent in conformity, and the detection rate of a Jo-1 antibody positive in dermatomyositis/polymyositis is increased to 35%-40%, furthermore the positive signal value is increased by 10-20%.

The invention discloses a high-concentration organic waste water gathering and transportation pipeline scaling prediction method based on system dynamics, which comprehensively considers the comprehensive effect influence of a plurality of scaling control factors such as scaling ion concentration, thermodynamics, fluid dynamics, crystal dynamics, pipeline properties, scale characteristics and thelike on the scaling rate and removal rate of the surface of a pipeline, so as to solve the problems that in the prior art, the relation between all control factors and scaling amount changes is not comprehensively considered, and the deviation between a prediction result and the actual engineering situation is large. According to the method, various scaling influence factors of the waste water transportation pipeline are comprehensively considered, the accuracy of a scaling prediction result is improved, and the scaling amount and the scaling trend of the pipeline in a certain period can be effectively predicted by introducing a time factor. Meanwhile, the method can be popularized and applied to the scaling problem of other waste water conveying pipelines.

The invention discloses an ultra-high performance liquid chromatography method for determining the molecular size distribution of human serum albumin. The method comprises the step of determining themolecular size distribution of the human serum albumin by means of ultra performance liquid chromatography. In the ultra high performance liquid chromatography analysis, ACQUITY UPLC PROTEIN BEH SEC Column and a chromatographic column with 200 angstrom, the particle size of 1.7 micron, the column length of 150 mm and the column diameter phi of 4.6 mm are adopted, the column temperature is room temperature, a PBS buffer solution with the mobile phase of 0.2 mol L<-1> and the flow rate of 0.6 ml min<-1> is adopted, a Waters UPLC TUV ultraviolet detector is used for collecting data at 280 nm, thesample injection volume is 10 microliters, the volume of a strong probe washing solution is 200 microliters, the volume of a weak probe washing solution is 600 microliters, and a quantitative loop option is partial loop with needle overfill. According to the UPLC method for determining the molecular size distribution of the human serum albumin in the research, compared with original HPLC methods,the detection speed is increased by more than 10 times, and the chromatographic response is increased by more than 5 times. The UPLC method for determine the polymer content of a human serum albuminproduct is high in detection speed, simple and good in repeatability. The UPLC method helps to achieve high-throughput determination of human serum albumin multimers, and the efficiency of testing thehuman serum albumin is substantially improved.