45results about How to "Achieving precise measurements" patented technology

The invention discloses a method for determining contribution of pores with different apertures in a shale reservoir stratum to porosity, and belongs to the technical field of petroleum, geology and mining exploration and development. The method comprises the following steps: selecting three groups of parallel samples from shale reservoir stratum samples at the same depth; carrying out a low-temperature nitrogen adsorption-desorption experiment on the first group of samples to determine contribution of the pores with aperture ranging from 0.4-100 nm to the porosity; carrying out argon ion polishing and electron scanning microscope examination on the second group of samples to determine the contribution of the pores with aperture ranging from 50 nm to 3 microns to the porosity; carrying out mercury intrusion analysis on the third group of samples to determine the contribution of the pores with aperture greater than 1000 nm to the porosity; synthesizing the analytic data of the three groups of parallel samples, and obtaining the determination results of contribution of the pores with different apertures in the shale reservoir stratum to the porosity. The method can determine the contribution of the pores with different apertures in the shale reservoir stratum to the porosity, and overcomes the defect of the conventional gas adsorption method and the mercury intrusion method for determining the contribution of the pores with different apertures in the shale reservoir stratum to the porosity.

The invention belongs to the fields of geology and detection and relates to an underground cavity volume method and an underground cavity volume detection device. Particularly, the underground cavity volume detection method includes the following steps of 1) filling water into an underground cavity or keeping the underground cavity full of water; 2) adding detectable reagent of known quantity of A0mg into the underground cavity; 3) dispersing the detectable reagent in the step 2) in the water uniformly; 4) detecting concentration C' mg/L of the detectable reagent in the water; and 5) computing the volume V' of the water filled in the underground cavity according to the following formula, and obtaining the volume V of the underground: V=V'=A0/C'/1000m3. The invention further discloses the underground cavity volume detection device. The underground cavity volume method is capable of accurately measuring the volume of the underground cavity, particularly an empty combustion area and is short in cycle, free of risk, fine in repeatability and simple in process.

The present invention relates to ultrashort pulse laser testing technology, and is especially pumping and detecting method and device of double beam and two angle ultrashort pulse laser. The pulse laser beam the ultrashort pulse laser emits is split into two beams in the beam splitter, includes one as the pumping laser beam and one as the detecting laser beam. The detecting laser beam is delayed in a delay line and split in a beam splitter into two beams incoming to the surface of the sample in different angle, two photo detectors receive the reflected signals independently, the signals are acquired with one phase-lock amplifier and one computer, and the data are processed in the computer to obtain the optical characteristic curve of the sample. The present invention can measure both dielectric constant and light beam polarizing value of material, and realize precise determination of physical parameters in the conversion process in the time resolution of femtosecond level.

The invention discloses a laser gas detection method with an automatic linearity correction function, and belongs to the field of mining industry gas concentration measurement. The method comprises the following steps of: generating a detection light beam, branching the detection light beam, enabling the branched light beams to pass through a measuring air chamber and a reference air chamber, carrying out photovoltaic conversion and harmonic wave phase locking detection, then carrying out collecting and converting and finally sending the treated light beams into a core processor; for a signal generated by the light beam passing through the reference air chamber, comparing a detected gas concentration value and a central wavelength position with two reference data values recorded during calibration at the first time by the core processor, and if the values are different, starting a linearity correction algorithm, and correcting the device; and for a signal generated by the light beam through the measuring air chamber, displaying and sending by the core processor according to a detected gas concentration value. The method provided by the invention can accurately measure gas concentration in a mine and can realize the automatic correction in a detection process, thus the underground maintaining times for workers are reduced.

The invention discloses a high-precision temperature probe on the basis of cavity filled micro-structure optical fiber interferometers. The high-precision temperature probe mainly comprises a light source, an object lens, a semi-transparent and semi-reflective mirror, an optical fiber structure and a detector. The optical fiber structure comprises an optical fiber core, optical fiber cladding, a temperature-sensitive chamber, a first reflective coating and a second reflective coating; emergent light emitted by the light source can be transmitted through the object lens into the optical fiber core via the semi-transparent and semi-reflective mirror, and one part of the light is reflected to the first reflective coating when the light source reaches the surfaces of the temperature-sensitivechamber, and then returns on an original path to be transmitted into the optical fiber core; the other part of the light is directly transmitted into the temperature-sensitive chamber, and then returns on an original path to be transmitted into the optical fiber core after the other part of the light reaches the second reflective coating, and two channels of returned light signals can be reflectedto the detector via the semi-transparent and semi-reflective mirror. The high-precision temperature probe has the advantages that the high-precision temperature probe can be applied to accurately monitoring the temperatures in narrow and small spaces and high-corrosion environments, and different sensitive materials can be selected according to the actual requirements, so that different parameters can be monitored in real time.

The invention relates to a digital signal processor (DSP) based linear array charge coupled device (CCD) online detection system for absorbable suture line diameter. The DSP based linear array CCD online detection system for absorbable suture line diameter comprises structural members and a system circuit. The structural members include a light source support, a CCD support, guide wheels and a guide rail. The guide wheels and the guide rail are fixed to the surface of a platform of a wet spinning machine. A linear array CCD comprises a linear array CCD module and a casing; a plug rod B is arranged at the bottom of the casing and is in close fit with a central slot of a holder B. A telecentric lens is mounted at the front end of the linear array CCD and provided with a shading device. The shading device consists of a lens hood and a shade piece. The system circuit consists of an optical imaging module, a linear array CCD drive module, a high-speed analog/digital (A/D) data acquisition and DSP digital signal processing module. Compared with the conventional measurement method, the DSP based linear array CCD online detection method for the absorbable suture line diameter has the advantages that the line diameter can be detected in real time accurately during production and twisting of absorbable sutures, a DSP controller output end provides detection data for a spinneret mechanism and a tension control system to realize closed-loop control of spinneret pressure and stretch tension, thus the produced sutures have good uniformity.

The invention discloses a method for detecting trace elements in pyrite, which comprises the following steps of adsorbing an iron matrix in pyrite by using modified polyurethane foam, determining theadsorption efficiency of the modified polyurethane foam to the iron matrix by ICP-OES, and detecting the content of the trace elements by ICP-MS and ICP-OES. The modified polyurethane foam provided bythe invention is polyurethane foam modified by isothiocyanate and/or mercaptan, has high adsorption rate on an iron matrix in the pyrite, is beneficial to recovery of trace elements in the pyrite, and enables the recovery rate of 17 trace elements in the pyrite to be 95-103%. The modified polyurethane foam provided by the invention has a specific adsorption effect on an iron matrix, and is high in adsorption capacity and resistant to acid, so that the purpose of rapidly, accurately and accurately detecting trace elements in pyrite is achieved.

The invention discloses an improved hydrostatic pressure testing device and a testing method, and the device comprises a water storage device, a control mechanism, a leveling device, a pressure bearing device, and a measuring transmission device. The water storage device is used for supporting the whole device and temporarily storing the water for experiment. The control mechanism is used for controlling the water stored in the support to flow between the tank and the support. The leveling device is used for setting the tank to be in a horizontal state. The pressure bearing device is used forconverting the hydrostatic pressure into the rotational torque of the bearing body. The measuring transmission device is used for converting the rotational torque of the pressure bearing device into adeformation of the torsion spring, by which the torque of the torsion spring is obtained, thereby obtaining the value of the hydrostatic pressure, and further obtaining a quantitative relationship between the hydrostatic pressure and the water depth. The improved hydrostatic pressure testing device and the testing method are simple in structure and clear in principle, therefore, the accurate measurement of hydrostatic pressure, the law of hydrostatic pressure in different water depths, and the hydrostatic pressure action point can be obtained through the technical design of the invention.

The invention discloses a method for determining fatty acid in rice by using the gas chromatography-mass spectrometry. The method comprises the following steps: (1) preparation of a sample to be determined: pulverizing a rice sample, sequentially adding n-hexane, an acetyl chloride-methanol solution and butylated hydroxytoluene, mixing, and heating to perform fatty acid extraction and methyl esterification treatment; cooling to room temperature, adding a sodium carbonate solution, uniformly mixing, centrifuging, taking supernatant, and filtering to obtain a sample to be detected; and (2) determination of fatty acid components: performing quantitative or qualitative determination on 37 kinds of fatty acids of the sample obtained to be detected in the step (1) by adopting a gas chromatograph-mass spectrometer. According to the present invention, through the common cooperation of the extraction method and the determination method, the accurate qualitative and quantitative determination of37 kinds of fatty acids in rice is achieved, the difficult problem that the fatty acid components in rice cannot be accurately determined in the prior art is solved, and the determination of a variety of fatty acids can be achieved on the basis of the assurance of the determination accuracy of the fatty acid components.

The invention discloses a method for rapidly assaying activity of DNA polymerase. The method comprises the steps: (1) drawing a standard curve and calculating an equation of linear regression: mixingtwo kinds of oligonucleotide probes H1 and H2 by different proportions, measuring fluorescence values, drawing the standard curve, and calculating the equation of linear regression; (2) carrying out aDNA polymerase activity detecting reaction under isothermal conditions: employing a working solution only containing H1 obtained in the step (1) as a substrate, adding a dNTP mixed solution and magnesium ions, and preparing a DNA polymerase activity detecting reaction system by employing a reaction buffer corresponding to the DNA polymerase; (3) determining a fluorescence value of a product afterstopping the reaction: forcefully stopping the reaction after an isothermal reaction, cooling the temperature of a system to room temperature, then, assaying the content of the product, and recordinga fluorescence added value in 30min; and (4) calculating enzymatic activity: substituting the fluorescence added value into the equation of linear regression corresponding to the standard curve obtained in the step (1) to obtain the content of the product in the system, and calculating the activity of raw enzyme liquid. Independent of isotopes, the operation is simple, and the accuracy and repeatability are good.

The invention provides a rice plant carbon isotope field in-situ calibration system, which comprises the following components: a carbon marker release device, which comprises a motor, a screw, a sliding member and an injector, wherein the motor is in transmission connection with the screw and is used for driving the screw to rotate, the sliding part is connected with the screw rod and the injectorand is used for sliding under the driving of the screw rod so as to extrude and release the carbon marker in the injector; a marking box, wherein the marking box is hollow, an opening is formed in the bottom of the marking box, and the marking box is communicated with the injector through a carbon marker release tube; and a motor controller connected with the motor through a first signal line andused for sending a signal for driving the screw to rotate to the motor. The invention further provides a rice plant carbon isotope field in-situ calibration method. According to the rice plant carbonisotope field in-situ calibration method, 13C in-situ calibration is conducted on rice plants under the field in-situ condition, the process is controllable, measurement is accurate, human interference is reduced, and the 13C marking cost is reduced.

The invention relates to a method for measuring density of desulfurization slurry in a power plant desulfurization pre-washing tower. The method includes: measuring slurry pressures of the pre-washing tower at different horizontal heights, subtracting the measurements to obtain a slurry pressure difference P corresponding to a difference h of the different horizontal height, and acquiring density Rho of the desulfurization slurry in the pre-washing tower according to the formula: Rho = P/(gh). Also related to is a system for measuring density of desulfurization slurry in a power plant desulfurization pre-washing tower, and the density of desulfurization slurry is measured precisely using the method. The density of desulfurization slurry in the desulfurization pre-washing tower can be measured precisely through the system and method, measuring equipment is simplified, and measuring precision is improved; meanwhile, the system is simple in structure, the method is simple, and the system and method have significant effect and are suitable for popularization and use.

The embodiments of the invention disclose a two-dimensional Hankel matrix multi-scale SVD transformation method. The method includes the following steps that: S1, three-phase traveling wave data are collected, and modulus transformation is performed on the three-phase traveling wave data, and linear traveling wave mode signals are obtained, and the linear traveling mode signals are analyzed; S2, Xtransformation is performed on the traveling wave linear mode signals, and an approximate component Pj and a detail component Qj under the decomposition scale of a j-th layer are obtained; S3, a composite matrix Cj is constructed based on the S2, SVD transformation is performed on the Cj, a singular entropy corresponding to the decomposition layer is calculated, and a singular entropy increment deltaEj relative to an upper layer is calculated; if it is judged that the deltaEj is larger than a certain value epsilon, the approximate component Pj is assigned to a one-dimensional matrix X, and the step S2 is repeated, an optimal decomposition layer number r and detailed components Q1, Q2, ..., and Qr which are obtained after the decomposition of the first r layers are outputted; S4, dynamic threshold noise reduction processing is performed on a series of matrices Qi (i=1, 2, ..., and r) which are obtained after the r layers are decomposed, so that matrices which are represented by a symbol in the descriptions of the invention are obtained; and S5, transformation is performed on traveling wave signals X', and head wave and reflected wave time points are determined according to a singular point position in a traveling wave signal approximate component Qr which is obtained according to the decomposition of an r-th layer; and S6, a fault location interval is determined according to the head wave time of each monitor, and therefore, a fault point can be accurately located.

The invention discloses a motor vehicle driving path obtaining method, which is applied to the technical field of driving path detection, and comprises the following steps of setting a virtual base station in road sections on a road network based on a preset rule, and setting entity base stations on all other road sections connected with the road section where the virtual base station is located; setting a road section code for each road section in the road network, wherein the road section codes are base station codes on each road section and comprise virtual base station codes and entity base station codes; acquiring a first coding sequence containing an entity base station code on a driving road section based on a driving path of a motor vehicle, and obtaining a second coding sequence containing a virtual base station code based on the first sequence code; and obtaining a road section coding sequence based on the second coding sequence to obtain a driving path of the motor vehicle. The invention also discloses a system for acquiring the driving path of the motor vehicle. The method has the advantages that the number of base stations can be remarkably reduced while the running track of the motor vehicle can be accurately obtained, and therefore the cost needed by path detection is reduced.

The present invention relates to a method for detecting content of dibutyltin oxide (DBTO) by chromatography exactly. Wherein, the dibutytin oxide and excessive 1-8 C alkyl derivatives grignard reagent are reacted under ultrasonic action, residual grignard reagent is destroyed by excessive acid, organic non-polar solvent is added to extract to obtain dibutyltin alkyl substitution which is insoluble in water and has lower boiling point, content of dibutyltin alkyl substitution is detected by organic phase chromatography. The dibutyltin oxide precision detection can be realized by equivalent conversion of dibutyltin alkyl substitution which can be analyzed by chromatography. The present invention is simple, feasible and the detection precision is high, the problem that no method in present can detect exactly the dibutyltin oxide content is solved.