52results about How to "Few instruments" patented technology

A kit (10) for resection of bone (12) for use in implantation of a joint prosthesis (14) is provided. The kit (10) includes a guide (16), a tool (26) and a stop (32). The guide (16) defines an opening (20) through the guide (16). The guide (16) is in cooperation with the bone (12). The tool (26) may be constrained within the opening (20) of the guide (16). The tool (26) includes a cutting edge (30) for resection of bone (12). The stop (32) cooperates with the guide (16) and the tool (26) to limit the movement of the tool (26) within the guide (16) so that the position of the cutting edge (30) with respect to the bone (12)m may be controlled. The stop (32) includes a plurality of positions (34) with respect to the tool (26) and the guide (16).

A surgical morcellator includes a trocar body portion and a handle portion detachably mounted to the trocar body portion. The trocar body portion is relatively lightweight and may be used separately from the handle portion with other laparoscopic instruments while morcellation is not required during the surgical procedure.

The invention discloses a method for detecting content of short-chain or medium-chain chlorinated paraffin in a paint. The method comprises the following steps: extracting the short-chain or medium-chain chlorinated paraffin in the paint, detecting with a gas chromatography-negative chemical ionization source mass spectrometry detector, using the internal standard method, performing linear association on a total response factor of a short-chain or medium-chain chlorinated paraffin standard sample on the NCI (negative chemical ionization) mass spectrometry detector with the chlorine content of a short-chain or medium-chain chlorinated paraffin standard solution, detecting the actually measured chlorine content of the sample by the gas chromatography-negative chemical ionization source mass spectrometry detector, corresponding the actually measured chlorine content with the a liner reaction expression of the total response factor and the chlorine content of the short-chain or medium-chain, to obtain the total response factor of the sample, and thus obtaining the content of the short-chain or medium-chain chlorinated paraffin in the paint. The analysis method disclosed by the invention is exact and fast, has small interfering, and can perform optimal separation and qualitative and quantitative detections on each component in the sample.

The invention discloses a device and a method for measuring corrosion rate of concrete iron along length direction, and belongs to the field of concrete construction. The device comprises a table, a fixing device, a measuring device and a data acquisition device. The fixing device comprises a fixing frame and a fixture; and the fixing frame is provided with scale. The measuring device comprises a container, water and an automatic weighing device, and the water is positioned inside the container. The data acquisition device comprises a computer. One end of the fixture is arranged on the frame and capable of moving up and down, and the other end of the fixture is fixed at the upper end of the concrete iron; and the lower end of the concrete iron is placed in the water. The fixing frame is arranged on the automatic weighing device, which is connected to the computer through wires. The container and the automatic weighing device are arranged on the table. The measuring device has characteristics of simple assembly, convenient operation, few devices needed for testing and repeat usage, and can accurately measure the corrosion rate of the concrete iron along length direction.

The invention provides a method for testing the alkyl quaternary ammonium salt cationic, which includes the following steps: processing a pretreatment for the test sample; testing with a gas-chromatography-mass spectrometer, setting the injection port temperature of the instrument at 180-350 EDG C, setting the carrier gas flow rate at 0.5-2.0 ml per minute, the chromatographic column is a nonpolar, weak polar or strong polar column, setting the port temperature at 180-300 EDG C; injecting the pretreatmented sample into the chromatographic column through the injection port of the instrument, processing the programmed temperature, from 40-120 EDG C up to 210-320 EDG C, processing the mass spectrometric detection after each component of the decomposition products of the sample is separated by the chromatographic column. The method provided by the invention has the merits of cheap test instrument, safety, accurate and fast analysis method and small disturbance, which causes the alkyl quaternary ammonium salt cationic in the sample to pyrolyze on the injection port, and processes the optimized separation of each component of the pyrolyzed products.

The invention discloses a method for measuring dimethyl fumarate in a product by gas chromatography-mass spectrometry. The method comprises the following steps of: pretreating a dimethyl fumarate product to be detected by using an ultrasonic extraction method; setting the temperature of a sample injection port of a gas chromatography-mass spectrometer to be 240-280 DEG C, a flow rate to be 0.8-1.5 ml / min and the temperature of a port to be 280-300 DEG C, and selecting a weak polar column for a chromatographic column; enabling a sample to enter the chromatographic column through the sample injection port, and carrying out temperature programming on the temperature of the chromatographic column to separate the components of the sample by the chromatographic column; and enabling the components separated by the chromatographic column to enter a mass spectrometric detection part through the port of the gas chromatography-mass spectrometer, wherein an electron impact ion source is adopted as the ion source of the mass spectrometric detection. The method for measuring the dimethyl fumarate in the product by the gas chromatography-mass spectrometry has low detection limit, good detection effect, little consumption of analysis solvent and low detection cost.

The invention provides a method for detecting polycyclic aromatic hydrocarbon in food contact material by gas chromatogram-mass spectrometry coupling technique, comprising: Soxhlet extraction method or ultrasonic extraction method is used for extracting the detected food contact material; the extract sample is detected by a gas chromatogram-mass spectrometry coupling instrument; the temperature of a sample inlet of the instrument is set to be 240-320 DEG C, and the flow rate of carrier gas is set to be 0.5-2.0ml / min; a weakly polar chromatographic column is adopted, and the interface temperature is set to be 180-300 DEG C; the pretreated sample enters into the chromatographic column through the sample inlet of the instrument for temperature programming, and the temperature is raised to be 270-330 DEG C from 70-100 DEG C; after being separated by the chromatographic column, all the components in the sample are detected by mass spectrum. The method has the characteristics of low price of the detection instrument, safety, accurate and rapid analysis method and little interference as well as being suitable for standard analysis and detection which can lead all the components of the polycyclic aromatic hydrocarbon in the sample to be cracked in a mass spectrum ion source and optimize all the components of the cracked product, etc.

The invention discloses a device for testing bond performance of a reinforcing steel bar and concrete through drawing. The device comprises a loading frame, a concrete test sample, a T-shaped steel bracing wire, the reinforcing steel bar, a force sensor, a universal material testing machine, a displacement meter, a static signal test analysis system and a computer, wherein a PVC (polyvinyl chloride) pipe is arranged in the middle positions of the upper part and the lower part of the concrete test sample, the reinforcing steel bar penetrates through the PVC pipe, accordingly, the bonding-slip section of the poured test sample is only located in the middle of the concrete test sample, a T-shaped slide chute and a notch are reserved in steel plates at the upper part and the lower part of the loading frame, size scales are marked, and the loading device is accurately aligned by adjusting the positions of the reinforcing bar and the T-shaped steel bracing wire. The device is simple in structure and convenient to disassemble, few materials and instruments are required, and the device is applicable to scientific research and test of the bond performance of the reinforcing steel bar and the concrete on a construction site.

The invention discloses a method for detecting chloride ion concentration in water, and particularly relates to a method for detecting chloride ion concentration in water by employing a microfluidic paper chip method. Reagents used in the method are a mercuric thiocyanate-methanol solution and a ferric nitrate-concentrated nitric acid solution. Through drawing a standard curve, a linear equation is fitted by using a proportional relationship between the chloride ion concentration and a gray value within a certain concentration range. According to the method disclosed by the invention, detection can be finished by virtue of photographic equipment and a computer; and the method is simple and convenient.

The invention discloses a vertical load loading device for a shear wall. The vertical load loading device comprises a shear wall test piece, a polyfluortetraethylene plate, a bearing plate with concave holes on the top portion, more than five hydraulic jacks of the same specification, an antidumping net rack, pulleys and adjusting bolts which are in a counter-force system. The bearing plate with the concave holes on the top portion is arranged on the top portion of the shear wall test piece, the adjusting bolts are arranged on the left side and the right side of the bearing plate, the hydraulic jacks are arranged in the concave holes of the bearing plate and fixed through the antidumping net rack, the hydraulic jacks are connected in series through an oil pipe and connected with a hydraulic oil source and a pressure stabilizing system, the pulleys are arranged on the top portions of the hydraulic jacks, and the top portions of the pulleys are contacted with the polyfluortetraethylene plate at the bottom of a counter-force beam. The vertical load loading device is simple in structure, convenient to detach, suitable for exerting of vertical constant load during hysteresis performance testing of the shear wall test piece.

The invention discloses a hydraulic fixing device used for measuring bond properties of a steel bar with concrete. According to the hydraulic fixing device, a base plate, a top plate, and two side plates of an outer frame are all made of steel plates, and are welded together so as to form an integral body; the top plate is provided with a connecting bolt; the connecting bolt is connected with a load transducer; the middle part of the base plate is provided with a U-shaped groove; the middle part of the steel bar is arranged in a concrete test block, the upper part of the steel bar stretches out from the top of the concrete test block, and the lower part of the steel bar stretches out from the bottom of the concrete test block; the concrete test block is placed on the base plate, so that the lower part of the steel bar penetrates through the U-shaped groove and stretches out through the base plate; an upper backing plate is provided with a through hole, and is arranged on the top of the concrete test block; the upper part of the steel bar penetrates the through hole of the upper backing plate, and stretches upwards through the upper backing plate; and the bottom of a hollow jack is arranged on the upper backing plate, and the top of the hollow jack is pressed against the top plate. The hydraulic fixing device is suitable for site tests, is simple in structure, and is convenient for dismounting; and required materials and devices are few.

The invention discloses a device for determining the adhesive property of a steel bar and concrete in an extruding manner. The device comprises a loading framework, a concrete test piece, the steel bar, PVC (Polyvinyl Chloride) pipes, a displacement meter, a force sensor, a hydraulic jack, an oil pump, a static signal testing and analysis system and a computer, wherein the loading framework is composed of an upper steel plate, a lower steel plate and a high-intensity bolt; the steel bar is arranged in the middle of a concrete test piece; the upper end of the steel bar penetrates through a round hole formed in the middle of the upper steel plate; the displacement meter and the force sensor are arranged at the upper end and lower end of the steel bar respectively; the hydraulic jack is arranged below the force sensor; the displacement meter and the force sensor are connected with the static signal testing and analysis system; the static signal testing and analysis system is connected with the computer; the PVC pipes sleeves the two ends of the part, located in the concrete test piece, of the steel bar. The device disclosed by the invention has a simple structure and is convenient to detach; a few of materials and instruments are needed; the device is not only suitable for scientific researches, but also suitable for testing the adhesive property of the steel bar and the concrete at a construction site.

The invention relates to a method for measuring the mixed base concentration by combining a pH electrode and aflow injection analysis (FIA), which is characterized by comprising the following steps: 1, establishing a flow analysis system; 2, formulating a standard curve on pH values of different solutions and the peak areas of FIA peaks; 3, formulating a standard curve on the concentrations of solutions with different components; 4, determining the components of the base solution to be measured; and 5, measuring the concentration of the base solution to be measured. The method for measuring the components and concentration of the mixed base has the advantages of no indicator, simpleness, fastness, low use cost and cheap instruments, and is easy to operate.

The invention discloses a glucose determining method using rhodamine S double enzymatic spectrophotometry. 0.05-0.50mL HAc-NaAc buffer solution of pH4.6 and 0.05-0.50mL KI solution of 0.04mol / L are respectively added in a color-comparison tube of 5mL. Then, 0.05-1.0mL horseradish peroxides of 0.20Mug / mL are added and then 0.01-2.5mL 1.01*10-4mol / L glucose solution is added. Secondary distilled water is used for diluting the solution to the scale of 2.5mL. The mixed solution is shaken up and is arranged to be standing for 2-60 minutes. Then, 0.10-0.60mL 2.00*10-4mol / L rhodamine S solution is added. Secondary distilled water is used for diluting to 4.0mL. The mixed solution is shaken up and is arranged to be standing for 10 minutes. Arranged on an ultraviolet visible spectrophotometer, the absorbance value A526nm is measured at the wavelength of 526nm. Solution which is not added with glucose is used as agent blank A0 for calculating the value of Delta A526nm which is equal to the difference between A0 and A526nm. In addition, proper amount of glucose injection liquid is prepared, and the absorbance value is measured through the same method. The content of the glucose in the injection liquid can be worked out. The glucose determining method using rhodamine S double enzymatic spectrophotometry has the advantages of high sensitivity, convenient operation and cheap instrument.

The invention discloses a method for determining vitamin C by a golden nanometer particle spectrophotometry way. In a 5mL colorimetric cylinder, sequentially 0.1-2.0 mL HAuCl4 in concentration 95.64 Mu g / mL, 0.02-0.50 mL Sodium Citrate in concentration 1%, and 0.001-2.0mL vitamin C solvent in concentration 0.38mg / mL are added, mixed evenly, then some redistilled water is added to the graduation, mixed fully again; the absorption value is measured on a spectrophometer; meanwhile a blank test is conducted. The determining method is simple and rapid, the instrument used is cheap, and the reagent is easily available.

The invention discloses a device and method for testing variation of the early-age dynamic elastic modulus of concrete in a time-dependent manner. The device comprises an excitation tool and test part, a vibration response test part, a signal recording part and a signal processing part, wherein the excitation tool and test part comprise a PVC (Poly Vinyl Chloride) board and a force hammer capable of acting on the PVC board; a rubber hammer is arranged at the front end of the force hammer; a load sensor is arranged on the rubber hammer; the vibration response test part is an acceleration sensor; the acceleration sensor is arranged on the PVC board; the signal recording part is a dynamic signal test and analysis system; and the signal processing part is a computer. The device provided by the invention has the advantages of simple structure, convenience in dismounting and less needed materials and instruments, and belongs to nondestructive test. The device can perform tests repeatedly and continuously, is applicable to both scientific researches and test on the early-age dynamic elastic modulus of concrete in the early age in a construction field.

The invention relates to a dynamic visual stimulation visual mark testing system targeting different photoreceptor cells. The dynamic visual stimulation visual mark testing system includes a visual mark element generation module, a visual mark parameter control module and a visual mark presentation module, the visual mark element generation module is used for generating visual mark elements, and the visual mark elements are circles with the specific color and size; the visual mark parameter control module includes a visual mark size control module and a visual mark speed control module; the visual mark size control module controls the size of visual marks according to input parameters; the visual mark speed control module controls the speed of visual mark movement according to the input parameters; and the visual mark presentation module is used for presenting a visual mark background, a visual mark movement mode and a testing process.

The invention discloses a warm bag. The warm bag comprises an inner container, and the interior of the inner container is provided with a paraffin / graphene composite phase-change material; and heat preservation energy storage is realized by microwave heating. According to the warm bag provided by the invention, the composite phase-change material arranged in the inner container is subjected to heat storage by microwaves, the composite phase-change material is heated uniformly, the heating time is short and only a few minutes or even tens of seconds, so that the warm bag is convenient for a user to use, can be reused for a plurality of times, and has wide application prospects.

The invention discloses a concrete crack resistance testing device with the variable constraint degree and a testing method. The testing device comprises a concrete mold with an inner ring and an outer ring, and an annular concrete cavity is formed between the inner ring and the outer ring. The testing device is characterized by comprising a constraint controller, the constraint controller comprises a heat source and a temperature control heating cavity which enables the inner ring heated by the heat source to swell and act on the inner surface of concrete, and the temperature control heating cavity is located in the inner ring. Compared with the prior art, the concrete crack resistance testing device is simple in structure, convenient to disassemble and reusable. The constraint degree of the inner ring can be changed according to presetting, the crack time of the concrete is greatly shortened, the concrete crack resistance is evaluated by comparing difference of the crack time of the concrete, and the whole device can form a self-circulation system and save energy. The concrete crack resistance testing device is suitable for determining early-stage concrete crack resistance for scientific researches and construction sites and has wide application prospects.

The invention provides a sindbis virus XJ-160 defective replicon and a construction method and application thereof. The construction method comprises the steps of constructing an XJ-160 virus particle type replicon carrier pVa-XJ, constructing XJ-160 particle type replicons pVaXJ-EGFP and pVaXJ-GLUC containing reporter genes, constructing a XJ-160 defective replicon, utilizing Acl I restriction enzyme to respectively perform single digestion of the VaXJ-EGFP and the pVaXJ-GLUC and constructing defective particles pVaXJ-EGFP delta and pVaXJ-GLUC delta with 1139 base deletions at the positions of non-structural genes. The mechanism of the construction method is that due to the partial absence of non-structural genes regions, a large amount of the reporter genes cannot be expressed normally after cells are introduced into the defective replicon, and non-structural protein expressed by virus can remedy and react on expression of the large amount of the reporter genes caused by the defective replicon when alphavirus infection exists in the cells. The sindbis virus XJ-160 defective replicon can detect multiple types of alphavirus, has not reaction on non-alphavirus and is high in specificity and sensitivity and can detect 1PFU virus. Operation is simple and quick, required instruments are few, sustainability is strong, the virus is not required to be killed in detection, and the sindbis virus XJ-160 defective replicon is suitable for quick identification of the alphavirus.

The invention discloses an ultrasonic aflatoxin extraction device for quickly and directly detecting aflatoxin in cereals. The ultrasonic aflatoxin extraction device consists of an ultrasonic power supply, a vibrator, a door, a lifting adjustment button, a support frame, a treatment time setting key, a treatment power setting key and a power switch key, wherein the ultrasonic power supply is arranged in a circuit chamber on the left side of the device; the vibrator structure is assembled at the top of the device in a fastening manner through a rear seat of the vibrator structure; the support frame capable of adjusting lifting in a treatment chamber is assembled on a base plate; the lifting adjustment button for adjusting the lifting of the support frame and achieving positioning is assembled at the lower part of the right side wall; the treatment time setting key, the treatment power setting key and the power switch key are assembled on the front wall of the circuit chamber of the device; the door is in a hollow double-layer flat-plate structure made of a transparent PC material; the right side wall plate, the top and the left side wall plate of the treatment chamber, namely the right side wall plate and the base plate of the circuit chamber, adopt hollow double-layer flat plates made of PC materials, and are fixedly connected through upper and lower four parallel edges to form a frame structure; due to fastening fit of clamps and screws, the frame structure and a rear back plate of the treatment chamber form a slot structure.

The invention relates to an L-methionine product content determination method. According to the L-methionine product content determination method, an L-methionine product sample is used for preparing a sample solution according to the optical activity of L-methionine and the fact that the optical activity is in direct proportion to a solution concentration within a certain concentration range, the optical activity of the sample solution is tested and contrasted with the optical activity of a reference solution with a corresponding concentration and known mass percentage composition under the same conditions, and then the content of the L-methionine in the product sample is obtained. The L-methionine product content determination method is simple, easy to implement, fast, accurate, low in cost and suitable for content determinination of L-methionine products, and has obvious advantages compared with other methods; moreover, instruments are cheap.

The invention discloses a method for measuring melamine on the basis of methyl blue. The method includes sequentially adding 0.0, 0.02, 0.1, 0.3, 0.4, 0.5 and 0.6 mL of 50 mg / L melamine solution into7 color comparison tubes with the volumes of 10 mL, adding HCl and the methyl blue into the color comparison tubes, using solution without the melamine as reagent blank, achieving constant volumes atscales, carrying out reaction, measuring the absorbance A0 of the reagent blank and the absorbance A of solution with the added melamine solution at 598 nm locations on spectrophotometers by the aid of 1 cm cuvettes, and computing absorbance difference values delta A=A0-A; adding trichloroacetic acid and acetonitrile into an appropriate quantity of pure milk, carrying out ultrasonic treatment, centrifuging partial solution for 10 minutes, filtering supernatant by the aid of filter membranes and collecting filter liquid to be used as to-be-measured liquid; measuring absorbance values of 0.05 mLof to-be-measured liquid according to previous processes and computing the content of the melamine in the milk. The method has the advantages of simplicity and convenience in operation and inexpensive instruments.

The invention relates to an enzyme linked immunosorbent assay kit for detecting the residual amount of carbofuran in an aquatic product. The kit comprises a 96-hole elisa plate, an elisa secondary antibody, a carbofuran antibody working solution, carbofuran standard solutions with six concentrations, substrate color developing solutions, a stopping solution, a concentrated washing solution, a concentrated composite solution, a high-concentration standard, a cover plate membrane, a self-sealing bag, a description and a quality report. An indirect competitive ELISA method is adopted; holes formed in the elisa plate are pre-coated with conjugation antigens, carbofuran contained in a sample and the conjugation antigens pre-applied to the micro holes compete for combining carbofuran antibodies, and after the elisa secondary antibody is added, substrate color developing is performed with TMB; a sample absorbance value is compared with a standard curve and then multiplied by the corresponding dilution ratio, and then the residual amount of carbofuran in the sample can be obtained. Compared with an instrument assay technique, the kit has the advantages of being convenient to use, high in sensitivity and the like and can play an important role in residual amount detection of carfuran in the aquatic product.

The invention discloses a method for screening the transparency of a film-shaped heterogeneous biological material, which comprises the steps of dehydration of the biological material sucrose, OCT embedding, layer-by-layer frozen sectioning, and light transmittance measurement with a spectrophotometer. Also provided is a highly transparent decellularized dermal matrix obtained by the above method. Through the present invention, the acellular dermal matrix with the best transparency can be effectively screened out, which can be used for lamellar keratoplasty, and the surgeon can use the above-mentioned matrix to replace the existing lamellar corneal stroma during the operation. At the same time, it can also effectively solve the contradiction of the current shortage of donor corneas.

A device images radiation from a scene. The scene can include two materials with spectral characteristics in different radiation wavelength regions. A static filtering arrangement includes two filters with different passbands corresponding to the two wavelength regions. An image forming optic forms an image of the scene on a detector. The radiation from the scene is imaged simultaneously through an f-number of less than 1.5 onto two detector pixel subsets. The imaged radiation on one pixel subset includes radiation in one wavelength region. The imaged radiation on the other pixel subset includes radiation in the other wavelength region. Electronic circuitry produces a pixel signal from each detector pixel. The pixel signals include information associated with absorption or emission of radiation in one of the respective wavelength regions by the two materials. The electronic circuitry determines the presence or absence of each of the two materials based on the pixel signals.