Method for detecting Clenbuterol residual quantity in hair

The invention discloses a method for detecting clenbuterol residue in hair. The method sequentially comprises the following steps: (1) pre-processing a hair sample: hydrolyzing the sample with alkali at a high temperature, extracting the sample with an organic solvent and reversely extracting the sample with acid water; and (2) taking deuterated clenbuterol-D9 aqueous solution with the concentration of 5-500ng/ml as an internal standard, and detecting the clenbuterol residue in hair by liquid chromatogramy-tandem mass spectrometry. The method has the following advantages: 1. hair is taken as a detection material, which provides easy sampling, convenient storage and repeatable sampling, sampling is simple and rapid and has trace amount and high efficiency; 2. the pre-processing method of the hair sample is optimized, which shortens the pre-processing time, simplifies the processing steps and obviously reduces the cost; and 3. an isotopic compound is taken as the internal standard, and the ...

Multi-wire cutting machine mortar jet flow device

The invention discloses a multi-wire cutting machined mortar jet flow device, which is used in a multi-wire cutting machine for cutting semiconductor silicon chips or solar silicon cells in batch. The outer sleeve (1) of the device is fixedly provided with an inner pipe (2) of which one end is a mortar inlet and of which the other end is closed; an annular gap (6) is reserved between the outer wall of the inner pipe (2) and the inner wall of the outer sleeve (1); the upper part of the inner pipe (2) is provided with a plurality of small round holes (7) which are uniformly distributed along the axis of the inner pipe, and the small round holes (7) are communicated with the cavity of the inner pipe and the annular gap; and the lower side of the outer sleeve (1) has a slit open slot (8) along the axis. Due to the structural characteristics of the device and the changes of the flowing direction of the mortar in the device, the flow rate and density distribution uniformity of the mortar are ...

Magnetron sputtering target for filming previous metals

The invention relates to a magnetron sputtering target for filming previous metals, comprising a target seat with a fixed target backboard. The periphery of the top surface of the target backboard is provided with a permanent-magnet frame comprising target-edge permanent magnets, and the middle of the permanent-magnet frame is provided with a target-middle permanent magnet, a corresponding target-edge magnetic pole is arranged above the permanent-magnet frame, and a corresponding target-middle magnetic pole is arranged above the target-middle permanent magnet; the target-edge magnetic pole and the permanent-magnet frame, and the target-middle magnetic pole and the target-middle permanent magnet are respectively separated and coupled by a water-cooling board, and a target surface which is in a frame structure and is fixed on the water-cooling board by target strip clamps is arranged between the target-edge magnetic pole and the target-middle magnetic pole. The invention can remarkably reduce ...

LC-MS quantitative detection method for melamine and tricyanic acid in human urine

The invention discloses an LC-MS quantitative detection method for melamine and tricyanic acid in human urine. The method is characterized in that the isotope dilution technology is adopted, and in pre-processing of an urine sample, 13C3, 15N3-melamine or deuterated melamine, 13C3 and 15N3-tricyanic acid are respectively added in interior label solution; melamine and tricyanic acid in human urineare respectively extracted by a liquid-liquid extraction method; an LC-MS/MS method is established to respectively and quantitatively detect the concentration of melamine and tricyanic acid in human urine; a liquid chromatogram takes filled columns such as phenyl, fluorophenyl, silica gel and the like as immobile phase; methanol, acetonitrile, water, formic acid solution or mixed liquid as mobilephase; in chromatographic resolution, isocratic elution or gradient elution is carried out; and in mass spectrometric detection, an ESI Source is used for detecting the content of melamine and tricyanic ...

1, 5-anhydroglucitol assay kit and assay method thereof

A 1, 5-anhydroglucitol assay kit comprises a reference substance (1) containing 0.02-100mug/ml of 1,5-AG and 0.4-40mug/ml of 80 percent methanol solution of internal standard ((UL-<13>C6)1,5-AG), a quality control substance (2) containing 0.06-80mug/ml of 1,5-AG and 0.4-40mug/ml of 80 percent methanol solution of internal standard ((UL-<13>C6)1,5-AG) and a protein precipitator (3) containing 0.5-50mug/ml of methanol or acetonitrile of internal standard ((UL-<13>C6)1,5-AG). The liquid chromatography tandem mass spectrometry determination method is used for assay. The invention has the advantages that the prepared reference substance and the quality control substance solvent can be directly used for sample injection without treatment, and the proposal of adopting the protein precipitator to combine the internal standard not only simplifies the operation steps, but also ensures the accuracy of the determination result. The invention also optimizes the liquid chromatography conditions and the ...

Blanking system for detecting and sorting silicon chip or cell

The invention relates to the solar energy photovoltaic equipment field, and concretely relates to a blanking system for detecting and sorting a silicon chip or a cell, which comprises a rectangular mounting plate, a main transmission mechanism capable of transmitting the silicon chip/cell along the length direction of a base plate is arranged at the end face of the base plate, a main conveyor belt sheet box is arranged at the transmission end of the main transmission mechanism, the sheet box elevating systems are respectively arranged at two sides of the main transmission mechanism, a vertical transmission mechanism capable of transmitting the silicon chip/cell to the sheet box elevating system along the width direction of the mounting plate is arranged between the main transmission mechanism and the sheet box elevating system; the main transmission mechanism comprises two parallel main conveyor belts, and a lifting-up sheet transmission mechanism used for lifting the silicon chip/cell ...

Ion implantation high temperature target

Berberine additive product, medicament containing the same and preparation thereof

The invention relates to an additive product of berberine with a general formula (I), the structure of which is that: in the general formula (I), R refers to alkyl of C3-C5 containing beta-carbonyl. A preparation method of the additive product comprises the following steps that: berberine hydrochloride is prepared into aqueous solution which then reacts with a carbonyl compound with alpha-reactive hydrogen atom such as acetone or methyl ethyl ketone or methyl propyl ketone under the condition of pH value of 11-12, and then the mixture is filtered, cleaned and dried so as to obtain the additive product of berberine. Additive products containing the berberine or the additive product of berberine together with pharmaceutically usable auxiliary materials are used for preparing oral medicines with higher bioavailability than berberine pro-medicines, especially for preparing the medicines for resisting arrhythmia and heart failure, lowering blood fat or treating diabetes, and etc., and the medicines ...

Silk screen interval adjusting system used for screen printing machine and screen printing machine

The utility model discloses a silk screen interval adjusting system used for a screen printing machine and a screen printing machine and belongs to the production facility field of solar crystal silicon battery piece. In order to solve the problems that the existing screen printing device can not adjust the screen printing interval on line, and only can conduct manually mechanical adjustment, the silk screen interval adjusting system comprises a limiting sensor, a solid-state relay, an interval adjusting motor and a PLC (Programmable Logic Controller) on the screen printing machine. The output of the limiting sensor is taken as a switching value to be connected with the PLC, and the PLC program controls the running of the interval adjusting motor so as to precisely adjust the screen interval. The screen interval adjusting system can conduct accurate online adjustment, the adjusting accuracy achieves 0.01mm, so that the printing process is conveniently adjusted, the printing quality is improved ...

A take up device for silicon chip sorting system

The utility model discloses a take up device for silicon chip sorting system, including driving motor, screw mechanism and mounting bracket, screw mechanism is connected with driving motor's output, and the mounting bracket is installed has a plurality of take up parts along the even interval arrangement of vertical direction on screw mechanism and on the mounting bracket. This take up device has convenient to use, low cost, little, the capacious advantage of silicon chip collection of occupation space.

Conveying mechanism and method for manufacturing photovoltaic battery superfine gate electrode through ink jet printing

The invention discloses a conveying mechanism and a method for manufacturing a photovoltaic battery superfine gate electrode through ink jet printing. The conveying mechanism comprises a support plate, a conveying belt arranged on the support plate and driven by a belt pulley and a silicon wafer conveying seat assembled on the conveying belt and used for conveying silicon wafers. A conveying seat lateral guide plate for guiding the silicon wafer conveying seat is arranged on each side of the support plate, a heating element is arranged in the silicon wafer conveying seat, and an ink jet printing head for conducting ink jet printing on the silicon wafers is arranged above the conveying belt. A silicon wafer manufacturing method includes feeding, conveying and heating, online ink jet printing and heat insulation, conveying, online drying and material taking. The mechanism and the method achieve a silicon wafer online heating function, improves the stability and the accuracy of the silicon ...

Rectangular target with high target utilization ratio

The invention provides a rectangular target with high target utilization ratio, which is used for magnetron sputtering metal films. In the rectangular target, a water cooled base is fixed on a target substrate through an insulating plate; four edge permanent magnets made of NdFeB permanent materials are enclosed into a closed rectangular frame which is embedded on the water cooled base and is used as an N pole; a middle permanent magnet made of the NdFeB material is positioned in the middle of the rectangular frame, is embedded on the water cooled base, and is used as an S pole; the edge permanent magnets are cuboids, the upper parts of the edge permanent magnets, which is towards one side of the rectangular frame are provided with chamfers, and the middle permanent magnet is cuboid, the upper parts of two corresponding sides of the middle permanent magnets are also provided with chamfers; a target lining plate above the permanent magnets is fixed on the top of the water cooled base; and ...

Grid-type gas distribution device for MOCVD (metal-organic chemical vapor deposition) reactor

The invention discloses a grid-type gas distribution device for an MOCVD (metal-organic chemical vapor deposition) reactor. The grid-type gas distribution device is provided with three independent inlet gas paths, namely a gas path containing a first reactant source material, a gas path containing a second reactant source material and a carrier gas gas path. The three paths of gases enter a reaction chamber from grid-type gas nozzles, wherein the carrier gas gas path is also provided with an annular gas nozzle. The carrier gas gas path forms an isolation gas curtain to separate the gas containing the first reaction source from the gas containing the second reaction source, and the annular carrier gas nozzle separates the inner space of the reaction chamber from the reaction chamber wall. The grid-type gas distribution device effectively inhibits the pre-reaction among the reactants in the reaction chamber, and can reduce the generation of deposits on the reaction chamber wall, thereby enhancing ...

A high-sensitive blood-plasma total homocysteine detecting reagent box

Method for detecting Clenbuterol residual quantity in hair

The invention discloses a method for detecting clenbuterol residue in hair. The method sequentially comprises the following steps: (1) pre-processing a hair sample: hydrolyzing the sample with alkali at a high temperature, extracting the sample with an organic solvent and reversely extracting the sample with acid water; and (2) taking deuterated clenbuterol-D9 aqueous solution with the concentration of 5-500ng/ml as an internal standard, and detecting the clenbuterol residue in hair by liquid chromatogramy-tandem mass spectrometry. The method has the following advantages: 1. hair is taken as a detection material, which provides easy sampling, convenient storage and repeatable sampling, sampling is simple and rapid and has trace amount and high efficiency; 2. the pre-processing method of the hair sample is optimized, which shortens the pre-processing time, simplifies the processing steps and obviously reduces the cost; and 3. an isotopic compound is taken as the internal standard, and the ...

Suspended spraying type metal organic chemical vapor deposition (MOCVD) reactor

The invention relates to a suspended spraying type metal organic chemical vapor deposition (MOCVD) reactor, which can be used for the epitaxial growth of light emitting diodes (LEDs) on a large scale. The suspended spraying type MOCVD reactor comprises a nozzle, a base, a cover plate, flow diversion holes and a reaction zone, wherein the nozzle is arranged in the center of the base and comprises an upper nozzle and a lower nozzle; the lower nozzle is positioned on the lower part of the upper nozzle; the upper nozzle and the lower nozzle are provided with two radial channels respectively; the base comprise a large graphite disk; small graphite disks are arranged in the large graphite disk along the circumferential direction; wafer substrates are arranged in each small graphite disk along the circumferential direction; the bottom of the large graphite disk is provided with a revolution driving mechanism; the bottom of each small graphite disk is provided with an autorotation drive mechanism ...

Method for producing ion implantation thick film SOI wafer material

Multi-wire cutting machine mortar jet flow device

The invention discloses a multi-wire cutting machined mortar jet flow device, which is used in a multi-wire cutting machine for cutting semiconductor silicon chips or solar silicon cells in batch. The outer sleeve (1) of the device is fixedly provided with an inner pipe (2) of which one end is a mortar inlet and of which the other end is closed; an annular gap (6) is reserved between the outer wall of the inner pipe (2) and the inner wall of the outer sleeve (1); the upper part of the inner pipe (2) is provided with a plurality of small round holes (7) which are uniformly distributed along the axis of the inner pipe, and the small round holes (7) are communicated with the cavity of the inner pipe and the annular gap; and the lower side of the outer sleeve (1) has a slit open slot (8) along the axis. Due to the structural characteristics of the device and the changes of the flowing direction of the mortar in the device, the flow rate and density distribution uniformity of the mortar are ...

Method for manufacturing silicon wafer on insulator

The invention discloses a production technology for manufacturing a silicon wafer on an insulator by utilizing an oxygen-injecting isolation technology and a hot internal oxidation technology, comprising the steps of: 1. injecting oxygen ions for the first time at high temperature to form a continuous oxygen ion-rich layer; 2. injecting the oxygen ions for the second time at low temperature to incorporate a lattice defect layer; 3. implementing the hot internal oxidation technology in an oxygen-argon atmosphere with high oxygen content at high temperature, and speeding up the internal diffusion of oxygen atoms; 4. implementing high-temperature annealing in the oxygen-argon atmosphere with low oxygen content so as to repair the defects to thereby form a silicon oxide insulating buried layer having high quality; 5. rinsing in a HF solution to remove a surface oxide layer to result in final SOI wafer. By incorporating the lattice defect layer, the invention enhances the diffusive speed of ...

LC-MS quantitative detection method for melamine and tricyanic acid in human urine

The invention discloses an LC-MS quantitative detection method for melamine and tricyanic acid in human urine. The method is characterized in that the isotope dilution technology is adopted, and in pre-processing of an urine sample, 13C3, 15N3-melamine or deuterated melamine, 13C3 and 15N3-tricyanic acid are respectively added in interior label solution; melamine and tricyanic acid in human urine are respectively extracted by a liquid-liquid extraction method; an LC-MS/MS method is established to respectively and quantitatively detect the concentration of melamine and tricyanic acid in human urine; a liquid chromatogram takes filled columns such as phenyl, fluorophenyl, silica gel and the like as immobile phase; methanol, acetonitrile, water, formic acid solution or mixed liquid as mobile phase; in chromatographic resolution, isocratic elution or gradient elution is carried out; and in mass spectrometric detection, an ESI Source is used for detecting the content of melamine and tricyanic ...

Magnetron sputtering target for filming previous metals

The invention relates to a magnetron sputtering target for filming previous metals, comprising a target seat with a fixed target backboard. The periphery of the top surface of the target backboard is provided with a permanent-magnet frame comprising target-edge permanent magnets, and the middle of the permanent-magnet frame is provided with a target-middle permanent magnet, a corresponding target-edge magnetic pole is arranged above the permanent-magnet frame, and a corresponding target-middle magnetic pole is arranged above the target-middle permanent magnet; the target-edge magnetic pole and the permanent-magnet frame, and the target-middle magnetic pole and the target-middle permanent magnet are respectively separated and coupled by a water-cooling board, and a target surface which is in a frame structure and is fixed on the water-cooling board by target strip clamps is arranged between the target-edge magnetic pole and the target-middle magnetic pole. The invention can remarkably reduce ...

Full-automatic home roll wire arrangement device for multi-wire cutting machine

The invention discloses a full-automatic home roll wire arrangement device for a multi-wire cutting machine. A steel wire wound around a wire winding and unwinding shaft is wound in a wire groove of a home roll through a guide wheel. An electric linear platform is fixed between the guide wheel and the home roll. The electric linear platform is fixedly connected with the top end of a fixing plate. A position sensor and a reel are mounted at the lower end of the fixing plate. The steel wire is led out of the guide wheel and then wound in the wire groove of the home roll through the reel. A mounting block is fixed to the bottom end of the fixing plate. A detection sensor is fixed to the mounting block. The detection sensor and the position sensor can both be driven by the electric linear platform to move in the axial direction of the home roll. The detection sensor is close to the home roll and opposite to the wire groove in the home roll in position. The electric linear platform, the detection ...

Wafer self rotary device of strong stream oxygen ion injector

Rotation device includes following part and structure: front face of the target disk contains place for multiple wafers to be placed on; there are two ball bearings inside a through shaft hole in center of the target disk. Miniature motor is installed on back face of the target disk, and shaft of the motor is installed on one ball bearing. The shaft of silicon-lined turntable is installed on another ball bearing. One end of shaft of silicon-lined turntable is connected to shaft of the motor, and another end of the shaft of silicon-lined turntable is connected to center of the turntable. The invention overcomes issues of uneven dosage of injection (evenness less than or equal to 1%), and inconsistent color.

Rectangular target with high target utilization ratio

The invention provides a rectangular target with high target utilization ratio, which is used for magnetron sputtering metal films. In the rectangular target, a water cooled base is fixed on a target substrate through an insulating plate; four edge permanent magnets made of NdFeB permanent materials are enclosed into a closed rectangular frame which is embedded on the water cooled base and is used as an N pole; a middle permanent magnet made of the NdFeB material is positioned in the middle of the rectangular frame, is embedded on the water cooled base, and is used as an S pole; the edge permanent magnets are cuboids, the upper parts of the edge permanent magnets, which is towards one side of the rectangular frame are provided with chamfers, and the middle permanent magnet is cuboid, the upper parts of two corresponding sides of the middle permanent magnets are also provided with chamfers; a target lining plate above the permanent magnets is fixed on the top of the water cooled base; and ...

Method for manufacturing silicon wafer on insulator

The invention discloses a production technology for manufacturing a silicon wafer on an insulator by utilizing an oxygen-injecting isolation technology and a hot internal oxidation technology, comprising the steps of: 1. injecting oxygen ions for the first time at high temperature to form a continuous oxygen ion-rich layer; 2. injecting the oxygen ions for the second time at low temperature to incorporate a lattice defect layer; 3. implementing the hot internal oxidation technology in an oxygen-argon atmosphere with high oxygen content at high temperature, and speeding up the internal diffusion of oxygen atoms; 4. implementing high-temperature annealing in the oxygen-argon atmosphere with low oxygen content so as to repair the defects to thereby form a silicon oxide insulating buried layer having high quality; 5. rinsing in a HF solution to remove a surface oxide layer to result in final SOI wafer. By incorporating the lattice defect layer, the invention enhances the diffusive speed of ...

Suspended spraying type metal organic chemical vapor deposition (MOCVD) reactor

Enclosed infrared heating device for semiconductor chip

Automatic anti-deviation device applicable to silicon wafer or battery plate testing and sorting system

The invention discloses an automatic anti-deviation device applicable to a silicon wafer or battery plate testing and sorting system. In order to realize positioning of a silicon wafer or battery plate before detection and reduce error of subsequent module detection, the automatic anti-deviation device comprise a motor tension adjusting mechanism, a left guide anti-deviation mechanism, a right guide anti-deviation mechanism and a form bracket. The motor tension adjusting mechanism comprises a motor mounting plate, a stepping motor, two cam followers, a synchronous wheel, a synchronous pulley and the like; the left guide anti-deviation mechanism comprises a pair of straight gears, a synchronous pulley, a cam follower, two flat belt idlers and the like; the right guide anti-deviation mechanism comprises a synchronous pulley, a cam follower and three flat belt idlers. The automatic anti-deviation device improves the positioning accuracy and the capacity of silicon wafer or battery plate testing ...