30results about How to "High measurement precision" patented technology

The invention discloses a method for measuring the content of heavy metals in edible mushrooms by ICP-AES (inductively coupled plasma-atomic emission spectrometry), and mainly solves the technical problems that the specific contents of pesticide residues and overproof heavy metals in the edible mushrooms cannot be measured. The method is implemented by the following steps: 1, preparing an experimental material; and 2, pre-treating a sample, preparing a standard solution, measuring working parameters of an instrument, constructing a standard curve and measuring the sample, wherein under the conditions, by adoption of the ICP-AES method, the content of the heavy metals in a mushroom solution is measured; each sample is measured for three times in parallel, and then an average value is calculated; and the contents of all elements in the edible mushrooms can be obtained by carrying out unit conversion on measured data. The measurement method is scientific, accurate, high in measurement precision, quick in measurement and wide in linear range and has the advantages of measuring various elements simultaneously and the like. By the method for measuring harmful substances, poisonous and harmful edible mushrooms can be prevented from entering the market, and the development of an edible mushroom cultivation technology is promoted; and therefore, the method disclosed by the invention has a good popularization prospect.

Disclosed is a modified flavine-adenine-dinucleotide-dependent glucose dehydrogenase (FADGDH) having an improved thermal stability compared to a wild-type FADGDH, which is preferably derived from a eukaryote, more preferably derived from a filamentous fungus, still more preferably derived from a bacterium belonging to the genus Aspergillus. For example, the modified FADGDH has a primary structure having the substitution, deletion, insertion or addition of at least one amino acid residue in the amino acid sequence for FADGDH depicted in SEQ ID NO:2 or 46 in the Sequence Listing.

The invention discloses an apparatus and method for measuring the cloud point pressure and density of a supercritical CO2 microemulsion system. A magneton is arranged in a visual container, an electronic stirrer is arranged under the visual container, and the upper portion of the visual container is connected with a five-way valve. A quartz window is arranged on each of two parallel sides on the lower portion of the visual container, a light source is arranged on the outer side of one quartz window, and an opaque chamber is arranged on the outer side of the other quartz window. A photoresistor connected with a universal meter is arranged in the opaque chamber, and a CO2 gas cylinder is connected with the five-way valve. A second pressure transducer is connected to the five-way valve, one end of an intermediate container is connected to the five-way valve, and the other end of the intermediate container is connected with a three-way valve. A gas tank is connected with the five-way valve, one end of a high-pressure plunger pump is connected to the three-way valve, and the other end of the high-pressure plunger pump is connected with a water storage tank. A liquid volume metering device is connected with the three-way valve. The cloud point pressure of a supercritical CO2 microemulsion system and the density of the supercritical CO2 microemulsion system under the cloud point pressure can be obtained under same condition, the influence of minimal difference in parallel experiment processes can be minimized, and important basic data for designing construction scheme of an oil field can be provided.

The invention discloses a method of utilizing ICP-AES to measure the content of tungsten in ferromolybdenum. The method comprises the following steps: step one, weighing a ferromolybdenum sample; step two, preparing a ferromolybdenum sample solution and a ferromolybdenum sample blank solution; step three, preparing work curve solutions; step four, adopting inductive coupling plasma emission spectrograph (ICP-AES) to measure the intensities of the work curve solutions, and drawing a work curve by taking the concentrations of the work curve solutions as the horizontal coordinate and the intensities of the work curve solutions as the vertical coordinate; step five, drawing a work curve; step six, measuring the content of tungsten in the ferromolybdenum sample solution; and step seven, calculating the content of tungsten in the ferromolybdenum sample. The provided measurement method has the advantages of little using amount of ferromolybdenum sample, high reliability and precision, quick measuring speed, simpleness, accuracy, high sensitivity, and good stability.

The invention relates to a method and arrangement for the contactless determination of conductivity-influencing properties and their spatial distribution over the entire cross section of an electrically conductive substance moving in a primary magnetic field (B). The substance may be a liquid or a solid. A simultaneous measurement of a number of mechanical state parameters of the magnetic system is performed (three-dimensional components of the force and the torque), said parameters being variable by the effect of a secondary field on the magnetic system, the secondary field being produced on the basis of eddy currents induced in the substance by the primary field (B). To determine the spatial distribution of the property that is sought, the primary field is changed in intensity or form a number of times and a measurement of the state parameters is carried out for each change. The determination of the properties sought or their distribution takes place by solving an inverse problem using the method of least squares.

The invention relates to an adenosine deaminase detection kit. A vessel is contained in the detection kit and filled with liquid for detection, the liquid for detection is prepared from 50-100 mmol/L of glycine buffer solution, 50-80 mmol/L of sodium benzoate, 12/18 u/L of purine nucleoside phosphorylase, 30-40 u/L of xanthine oxidase, 200-300 u/L of peroxidase, 30-100 g/L of glyceraldehyde, 0.5 g/L of sodium azide, 10-200 mmol/L of disodium hydrogen phosphate, 100-300 mmol/L of KCl, 40-100 mmol/L of mannitol, 0.1-0.3 ml/L of preservative, 100-150 mmol/L of adenosine, 2-4 mmol/L of 4-aminoantipyrine, 10-15 mmol/L of color developing agent, 20-40 mmol/L of adenine nucleoside and 3-5 g/L of bovine serum albumin. The detection kit has the advantages of being high in determination precision, high in antijamming capacity, suitable for automated rapid determination and capable of creating favorable conditions for routine development of ADA detection application in clinic.

The invention discloses a rod type convergence gauge and a using method of the rod type convergence gauge. The rod type convergence gauge is mainly formed by connecting a light metal measuring rod, a main measuring and reading rod, a fixing anchor head, a measuring point fixing anchor head and the like. The light metal measuring rod and the main measuring and reading rod are seamlessly connected in a butted mode through a connecting bolt and a connecting nut, and the main measuring and reading rod is mainly composed of a hollow rod body, an internal hidden steel measuring tape, a spring, a metal pressing rod, a locking device, a micrometer caliper, a force measuring spring and a reference window. After the components of the convergence gauge are connected, the measuring tape hidden in the main measuring and reading rod is drawn out, the internal hidden spring is pressed in the process of drawing out the measuring tape, the convergence gauge is tensioned at the same time, then, a measuring tape locking ring is screwed down, and a rough read number is recorded; next, the micrometer caliper connected to one end of the main measuring and reading rod is rotated and meanwhile the force measuring spring is pressed, when the scale mark on a guide rod of the force measuring spring coincides with the scale mark on the reference window arranged on the measuring rod, it is shown that the tensile force is regulated to be accurate, the mantissa is accurately measured and read, and the measuring value can be obtained by adding the mantissa to the rough read number. The rod type convergence gauge has the advantages of being simple in structure, convenient to operate, high and stable in measuring accuracy and high in applicability.

The invention provides a piezoelectric actuator blocking force measuring device and method. The system comprises an external frame, an actuating component arranged in the external frame, a force-sensitive component, a displacement control component, a piezoelectric actuator to be detected, an actuator connection component and a connection spring, wherein the force-sensitive component, the displacement control component, the piezoelectric actuator to be detected, the actuator connection component and the connection spring are sequentially connected to the lower end of the actuating component and arranged in the external frame. One end of the connection spring is connected with the external frame, and an adjusting bolt penetrates through the lower end of the external frame and is connected with the connection spring to be used for adjusting the position of the connection spring and being connected with the actuator connection component and fixed. A first displacement sensor and a second displacement sensor are located outside the external frame, arranged on the two sides of a displacement control component and connected with the input end of a controller. The output end of the controller is connected with the actuating component. The invention further discloses the measuring method. By means of the piezoelectric actuator blocking force measuring device and method, the problem that the blocking force of an existing piezoelectric actuator cannot be measured is solved, the blank of the measuring technology is filled, and the piezoelectric actuator blocking force measuring device and method have the advantages of being high in measuring precision, good in stability and convenient to use.

The invention discloses a gantry dual-driving system and an error detection method thereof, and belongs to the technical field of automation control. The gantry dual-driving system comprises a cross beam, a driving shaft, a driven shaft, a main shaft, a first mark point and a second mark point, wherein the driving shaft and the driven shaft are parallel to each other, two ends of the cross beam are movably fixed on the main shaft and the driven shaft respectively, the first mark point and the second mark point are located between the driving shaft and the driven shaft, the main shaft is movably mounted on the cross beam, a visual system is arranged on the main shaft, and position information of the first mark point and that of the second mark point are read through the visual system respectively, so as to detect a journey error of the system. By virtue of mechanical characteristics of the dual gantry driving system per se, control complexity is reduced, not only is the characteristic of high measurement precision of the visual system exerted, but also the difficulty in double-side coupling control on the driving shaft and the driven shaft is avoided, and the gantry dual-driving system has a very high practical value.

The invention discloses a method for measuring the aluminium content in a sherardizing agent through inductively-coupled plasma atomic emission spectroscopy, and belongs to the technical field of chemical detection. The method comprises weighing of a sample material, dissolution pre-treatment, melt extraction, treatment of the sample material, dilution and constant volume setting, wavelength selection, preparation of an aluminium standard solution, preparation of a calibration curve, detection with inductively-coupled plasma atomic emission spectroscopy, and calculation of analysis results andprecision. According to the method, the dissolution pre-treatment is fast, the matching ability and anti-matrix interference of the prepared aluminium standard solution are great, the detection process is easy to master, and the detection result is accurate and reliable. According to the method, the test range of w(Al) is 15.00-40.00%.

The invention discloses a detection method for related substances in a ganirelix acetate injection, which has the advantages of quickness, simplicity, convenience, high sensitivity, accuracy and reliability and is suitable for separating and determining the related substances in the ganirelix acetate injection. According to the method, the comprehensive influence of an analysis column, a mobile phase, a gradient elution program, a flow rate and a column temperature on separation and detection is comprehensively considered, so that the detection result is optimized, and the method has the advantages of rapidness, simplicity, convenience, high sensitivity, accuracy and reliability, and is suitable for separating and determining related substances of the ganirelix acetate injection.

The invention discloses a simple flow meter used in the fields of petroleum, chemical industry, etc., which comprises a pipe body, an impeller assembly and a display controller. The pipe body is provided with a liquid inlet, a liquid outlet and a measuring pipeline. The display controller includes The casing and the control module, the impeller assembly includes an impeller seat and a blade assembly, one end of the impeller seat extends into the measuring pipe, and the other end is fixed on the casing, a preamplifier is arranged in the impeller seat, and an induction coil is arranged in the preamplifier, and A permanent magnet is embedded in the center of the induction coil, and an amplifier electrically connected to the control module is provided at the upper end of the induction coil, and the blade assembly includes a blade base, two or more blades on the blade base and metal rods on the blades; The two ends of the blade seat are connected to the impeller seat through bearings; the principle of the magnetic flux change in the induction coil caused by cutting the magnetic field line with the metal rod is used, and then the magnetic flux is amplified and displayed, so as to achieve simple overall structure, fast speed and high measurement precision.

The invention relates to a total bile acid detection reagent. The detection reagent is composed of the following components: 6-8wt% of a preservative, 30-40mmol/L of sodium pyruvate, 30-40g/L of glycinate buffer solution, 8-10g/L of dextran sulfate, 2-3g/L of 2-hydroxy pyridine-N-oxide, 5-8g/L of a stabilizer, 30-40mmol/L of phosphatic buffer solution, 6000-7000u/L of diaphorase, 3-4g/L of sodium azide, 4-5mmol/L of a chemical oxidant, 2-3wt% of a free-drying protective agent, 30-40mmol/L of NaCl, 6-8KU/L of 3alpha-hydrocarbon sterol dehydrogenase, 3-10g/L of human serum albumin, 6-8mmol/L of an oxidizing auxiliary enzyme I, 12-15g/L of a reduced coenzyme I and 2-3g/L of nitrotetrazolium blue. The detection reagent provided by the invention is high in determination precision, strong in anti-interference capability, good in stability, long in retention period and easy to store and transport.

The invention discloses a simple flow meter used in the fields of petroleum, chemical industry, etc., which comprises a pipe body, an impeller assembly and a display controller. The pipe body is provided with a liquid inlet, a liquid outlet and a measuring pipeline. The display controller includes The casing and the control module, the impeller assembly includes an impeller seat and a blade assembly, one end of the impeller seat extends into the measuring pipe, and the other end is fixed on the casing, a preamplifier is arranged in the impeller seat, and an induction coil is arranged in the preamplifier, and A permanent magnet is embedded in the center of the induction coil, an amplifier electrically connected to the control module is provided at the upper end of the induction coil, and the blade assembly includes a blade base, two or more blades located on the blade base, and a metal rod located on the blade; The two ends of the blade seat are connected to the impeller seat through bearings; the principle of the magnetic flux change in the induction coil caused by cutting the magnetic field line with the metal rod is used, and then the magnetic flux is amplified and displayed, so as to achieve simple overall structure, fast speed and high measurement precision.

The invention discloses an on-line analysis and detection device and method for heated cigarette smoke. The device comprises a cigarette holder, a cigarette smoking module, an on-line sampling module, an on-line internal standard introduction module, an on-line smoke analysis module, a flow path system and a control module. The cigarette holder, the cigarette smoking module, the on-line introduction internal standard module and the on-line smoke analysis module are communicated with the on-line sampling module through the flow path system, and the on-line introduction internal standard module is further used for being communicated with external carrier gas; the on-line sampling module is used for collecting a smoke sample and introducing the smoke sample into the on-line smoke analysis module; the on-line internal standard introduction module is used for collecting an internal standard gas sample and introducing the internal standard gas sample into the on-line flue gas analysis module; and the on-line smoke analysis module is used for receiving the smoke sample and the internal standard gas sample to carry out smoke on-line analysis and detection. Internal standard gas is quantitatively introduced into the on-line flue gas analysis module through the on-line internal standard introduction module, so that the sample introduction amount can be ensured to be accurate, and the detection precision is improved; the smoke sample does not need to be subjected to any sample pretreatment, and simplicity, convenience and high efficiency are achieved.

The invention belongs to the field of medicines, and relates to a method for determining the content of pregabalin and a hydroxybenzene ester bacteriostatic agent. Specifically, the invention relatesto the method for simultaneously determining the pregabalin content and the hydroxybenzene ester bacteriostatic agent content in a pregabalin oral solution. The method is an HPLC method, and HPLC conditions are as follows: a chromatographic column is an octadecylsilane chemically bonded silica column; the column temperature is 20 to 40 DEG C; the mobile phase A is a 20 to 30 mmol/L monopotassium phosphate solution, and the pH value is 6.2 to 7.0; the mobile phase B is methanol; the flow rate is 0.5 to 1.5 mL/min; the sample size is 10 to 30 [mu] L; and the detection wavelength 210 nm. The method disclosed by the invention is good in specificity, high in sensitivity, good in repeatability and high in accuracy, and can be used for controlling the quality of the pregabalin oral solution.