43results about How to "Test sensitive" patented technology

The invention provides a method of measuring lead content in shredded squid by microwave digestion-atomic absorption spectroscopy. The method is characterized in that a shredded squid sample is pre-treated by adopting microwave digestion; mixed liquor of 2% ammonium dihydrogen phosphate liquor, 1% nitric acid liquor and 1% ascorbic acid liquor which are in a volume ratio of (3-5):2:1 is used as a matrix modifier; in an absorbance measuring process, the matrix modifier, sample liquor and standard liquor are measured at the same time, so that interferences of matrix can be lowered while lead is measured, accuracy of the measuring method can be improved, and signal stability can be increased. The whole test process is simple, sensitive and accurate, can be used for measuring the lead content in the shredded squid and is further widely applicable to a lead content test of diet consumables of drink, soy sauce, rice, flour, powered milk and the like in addition to being.

The invention relates to a Measuring probe, especially for a device for the measurement of the thickness of thin layers, with a housing (14) comprising at least one sensor element (17), which is accepted along a longitudinal axis (16) of the housing (14) at least slightly movable to the housing (14) and with a contact spherical cap (21) assigned to the at least one sensor element (17) for setting the measuring probe (11) onto a surface of a measuring object, whereby in that the at least one sensor element (17) is accepted by a holding element (18) - along the longitudinal axis (16) of the housing (14) - which is spring-loaded resiliently and which is fastened on the housing (14).

Provided are a test device and a test method for the hydraulics size of shear flow polymer. The device comprises a liquid barrel, a shear flow generator, a filter liquid collection container and a support for supporting the liquid barrel and the shear flow generator, wherein the liquid barrel is provided with a piston matched with the inner diameter of the liquid barrel, the lower end of the liquid barrel is communicated with the shear flow generator, the shear flow generator is composed of an upper chuck, a lower chuck, an upper layer filter membrane and a lower layer filter membrane, the upper layer filter membrane and the lower layer filter membrane are arranged on the lower chuck, a liquid outlet pipe is positioned at the lower portion of the lower chuck, a control valve is positioned on the liquid outlet pipe, and the filter liquid collection container is positioned under the liquid outlet pipe. The method using the test device comprises the steps of preparing polymer solution, filtering and drawing relation curve between viscosity retention rate and corresponding hole diameter of the lower layer filter membrane. When the viscosity retention is 70%, the hole radius of the corresponding lower layer filter membrane is the average hydraulics radius of the shearing rate.

Described is a process for effecting the relaxation of a tensive back, shoulder or neck muscle of a human mammal for a substantial period of time. The process of our invention consists essentially of the step of continuously or periodically administering to said human mammal through inhalation over a stress reactivity-reducing, tensive back, shoulder or neck muscle-relaxing period of time, a stress reactivity-reducing, tensive back, shoulder or neck muscle-relaxing quantity and concentration of one or more fragrance compositions having an aroma profile including one or more of a rose, floral, musky, ambery, sweet and / or powdery aroma notes.

The invention relates to an application of human polypeptide PSA2 in a preparation of a prostate gland cancer diagnosis kit, which belongs to the biotechnology field, and the invention can be used for an early diagnosis of prostate gland cancer and an evaluation of treatment effect. The invention discloses a preparation of human recombinant polypeptide PSA2 diagnostic reagent kit, and the preparation comprises an antibody preparation, a labeled antibody and a preparation of peridium antibody polystyrene micro-plates. The invention has the advantages that the operation of the kit is simple, the test is sensitive and the reappearance is good. According to a plurality of experiments of the detecting of prostate gland cancer, and each milliliter human recombinant polypeptide PSA2 is counted as one micro-gramme, the detecting reference range of the prostate gland cancer is: when each milliliter human recombinant polypeptide PSA2 is lower than 5nanogram, the prostate gland cancer is negative; when each milliliter human recombinant polypeptide PSA2 is higher than 5nanogram, the prostate gland cancer is positive.

The invention discloses a two-dimensional material transistor based on a two-dimensional electron gas controllable back gate, a manufacturing method and application thereof. The two-dimensional material transistor based on the two-dimensional electron gas controllable back gate includes a heterojunction including a first semiconductor and a second semiconductor formed on the first semiconductor, wherein the second semiconductor has a wider band gap than that of the first semiconductor, and a two-dimensional electron gas or two-dimensional hole gas is formed in the heterojunction; and a source,a drain, and a gate formed on the heterojunction, wherein the source and the drain are distributed on the second semiconductor, spaced apart from each other and are electrically connected through atwo-dimensional material, wherein the two-dimensional material is used as a conduction channel of the transistor, and the gate is electrically connected with the two-dimensional electron gas or two-dimensional hole gas. The two-dimensional material transistor based on the two-dimensional electron gas controllable back gate achieves a two-dimensional material transistor with a controllable back gate by using the high electron mobility of the two-dimensional electron gas.

The invention relates to a quantitative analysis method for measuring trace nickel in water by microwave digestion-flame atomic absorption spectrometry (FAAS), which is characterized in that: pretreatment is performed on a water sample by combining low-temperature concentration and microwave digestion; nonylphenol polyoxyethylene-10-ether (NP-10) is used as activating agent; and the trace contentis obtained from a regression equation or a working curve according to the linear relation between the absorbance difference between the water sample and the blank solution measured by a flame atomicabsorption spectrograph and the nickel content. The invention has the advantages of simple microwave digestion pretreatment process, small reagent amount, environmental protection, time saving, high efficiency and the like and is a fast, accurate, flexible and widely-applicable analysis method for measuring trace nickel in water.

Disclosed are methods and systems for measuring serotonin in a sample using liquid chromatography and mass spectrometry.

The invention discloses a CT polarity testing device, comprising a resistor (R1), a resistor (R2), a resistor (RS), a diode (D), a relay (CJ), a switch (AN1), a switch (AN2), a switch (AN3), a single-pole double-throw switch (K2), a switch (K1), a DC power supply (EC1), a DC power supply (EC2), a light emitting diode (LED1), and a light emitting diode (LED2). The CT polarity testing device satisfies the practical needs of the relay protection working site, and has advantages of sensitivity in testing, easy operation, portability, reliability and practicability. The CT polarity testing device can greatly improve the working efficiency and has direct and specific testing lamp indication. Furthermore, the CT polarity testing device is less in electric consumption, low in cost, low in energy consumption, and is applicable to the long time testing.

The invention discloses a highly-sensitive nitrogen dioxide sensor in the field of sensors. The highly-sensitive nitrogen dioxide sensor comprises a cylindrical ceramic pipe. Ceramic end caps are inserted in the centers of the two ends of the ceramic pipe, a spiral heating wire is arranged in the ceramic pipe, the two ends of the spiral heating wire are led out of center holes of the ceramic end caps through leads, the end face of one end of the ceramic pipe is provided with an Au reference electrode, the end face of the other end of the ceramic pipe is provided with an Au working electrode, the outside of the Au working electrode is covered with a TiO sensitive electrode, Pt leads are led out of the reference electrode and the sensitive electrode respectively, a spraying sintered layer made of nanometer indium tin oxide is arranged on the periphery of the ceramic pipe, a plurality of gold lines are arranged outside the spraying sintered layer, and the gold lines are connected between the working electrode and the reference electrode. The sensor is not sensitive to water, gasoline and gases such as carbon monoxide, is convenient to manufacture, has sensitivity in detection and can be used for detecting concentration of NO2 in the gaseous environment.

The invention includes a copolymer of vinylidene chloride with at least one monounsaturated comonomer and at least one branching monomer in an amount sufficient to increase molecular weight over that of a polymer prepared using the same process and same monomers in the same relative amounts except without the branching monomer, but preferably the branching monomer is present in a quantity not sufficient to result in measurable crosslinking as determined by solubility in tetrahydrofuran at up to 83° C. The invention includes a process for making the polymer and processes for forming the copolymer or compositions thereof as well as articles comprising the copolymer and compositions thereof. The copolymer exhibits improved bubble stability and is particularly useful for processes in which the copolymer is at least partially oriented in formation such as blow molding, formation of monofilament fiber and film blowing.

The invention relates to a quantitative analysis method for determining trace cobalt in water by FAAS method of microwave digestion. Activator, according to the linear relationship between the absorbance difference measured by the water sample measurement system and the reagent blank solution on the flame atomic absorption spectrometer and the cobalt content, the cobalt content is obtained according to the regression equation or the working curve; it has a digestion pretreatment process Simple, less reagent consumption, environmental protection, time-saving, high efficiency; high analysis accuracy and sensitivity; low analysis cost and instrument maintenance, etc., is a fast, accurate, sensitive, and widely applicable method for the determination of trace cobalt in water Analytical method.

A vehicle turning state detection device based on an electronic sensor, comprising a vehicle state detection module installed on the vehicle, the vehicle state detection module is provided with a geomagnetic sensor and an acceleration sensor; the vehicle state detection module is connected with an output module, the The output module is connected with a sound prompting device, an image prompting device and a record storage device arranged in the vehicle. The present invention uses electronic sensor technology to test sensitively and accurately to quickly and accurately determine the turning state of the vehicle, and combines the advantages of the above two sensors to effectively avoid sensor misjudgment.

The present invention relates to the application of human RGPR protein in preparing prostatic cancer diagnosing reagent kit for early diagnosis of prostatic cancer and treating effect evaluation, and belongs to the field of biotechnology. The RGPR diagnosing reagent kit of the present invention is prepared through the following steps: antibody preparation, antibody marking, and antibody coating micro porous polyethylene plate. The present invention has the advantages of simple operation, high detecting sensitivity and high reproducibility.

An Alpha-oxoglutarate content measurement kit comprises a box main body, a cover plate, a rotation shaft and a fixed seat. A detection method comprises the steps of sample preparation, in which a sample is taken, PH7.8 phosphate buffer liquid is added for grinding, centrifugation is performed for 10 minutes, a supernatant liquid is waited for measurement; detection step, in which the detection step comprises the steps of 1, pre-heating by a photometer, and performing zero setting with distilled water; 2, adding a standard point, alanine, NAD+, glutamate dehydrogenase, 2-(4-iodobenzene)-3-(4-nitrobenzene)-5-(thiobenzoate)-2H-tetrazolium salt, a phosphate buffer liquid and alanine aminotransferase into a standard measurement pipe, adding alanine, NAD+, glutamate dehydrogenase, 2-(4-iodobenzene)-3-(4-nitrobenzene)-5-(thiobenzoate)-2H-tetrazolium salt, a phosphate buffer liquid and alanine transaminase into a blank pipe, adding the to-be-measured supernatant liquid and then adding constituents in the blank pipe into a sample measurement pipe, and adding the to-be-measured supernatant liquid, NAD+, glutamate dehydrogenase, L2-(4-iodobenzene)-3-(4-nitrobenzene)-5-(thiobenzoate)-2H-tetrazolium salt and a phosphate buffer liquid into a contrast pipe; and 3, immediately and uniformly mixing, reacting for 30 min, transferring to a glass cell, reading a light absorption value A of each pipe, and calculating Alpha-oxoglutarate(Alpha-KG) content according to sample mass. The method is simple and easy to operate.

The invention relates to an application of human polypeptide PSA2 in a preparation of a prostate gland cancer diagnosis kit, which belongs to the biotechnology field, and the invention can be used for an early diagnosis of prostate gland cancer and an evaluation of treatment effect. The invention discloses a preparation of human recombinant polypeptide PSA2 diagnostic reagent kit, and the preparation comprises an antibody preparation, a labeled antibody and a preparation of peridium antibody polystyrene micro-plates. The invention has the advantages that the operation of the kit is simple, the test is sensitive and the reappearance is good. According to a plurality of experiments of the detecting of prostate gland cancer, and each milliliter human recombinant polypeptide PSA2 is counted as one micro-gramme, the detecting reference range of the prostate gland cancer is: when each milliliter human recombinant polypeptide PSA2 is lower than 5nanogram, the prostate gland cancer is negative; when each milliliter human recombinant polypeptide PSA2 is higher than 5nanogram, the prostate gland cancer is positive.

The invention discloses a rapid test instrument and a method for obtaining the characteristic water holding curve of soil with a strong structure through a transient state method. The test instrumentcomprises a base made of organic glass. A soil sample container for storing a soil sample is arranged on the base. Between the base and the soil sample container, a volumetric water content testing device and a matrix suction testing device are arranged. The volumetric water content testing device is connected to an electromagnetic wave emitter through a coaxial cable. The matrix suction testing device is connected to a pressure meter through a hard plastic pipe. The volumetric water content testing device and the matrix suction testing device are used to test the volumetric water content andthe matrix suction of a tested soil sample, and the volumetric water content and the matrix suction are associated to obtain the characteristic water holding curve of the soil sample. The structure ofthe rapid test instrument is simple; the soil structure is not destroyed, the process of calibrating the device for testing the volumetric water content is simple, the test is rapid, and the measurement precision is high. The test instrument and method are especially suitable for rapidly testing the characteristic water holding curve of structural soil.

The invention discloses a method and a system for measuring serotonin in a sample using liquid chromatography and mass spectrometry.

A CT polarity testing device, which includes: a first resistor (R1), a second resistor (R2), a third resistor (RS), a diode (D), a relay (CJ), a first switch (AN1), a second Second switch (AN2), third switch (AN3), single pole double throw switch (K2), switch (K1), first DC power supply (EC1), second DC power supply (EC2), first light emitting diode (LED1) , the second light emitting diode (LED2). The invention fully meets the actual needs of the relay protection work site, has the characteristics of sensitive testing, convenient operation, portability, reliability and practicality, etc., can greatly improve the working efficiency of the site, and the test light indication is intuitive and specific, and the power consumption of electronic components is small , low cost, low energy consumption, and can be used for long-term testing.