113results about How to "Reduce sample preparation time" patented technology

According to one embodiment an apparatus includes a membrane and at least a portion of a nanotube imbedded within the membrane. The portion of the nanotube imbedded within the membrane provides a conduit through the membrane.

The invention discloses a method for detecting alkaloids and nitrosamines in tobaccos simultaneously, and belongs to the technical field of tobacco chemical composition detection. The method comprises the working procedures of: sample extraction, purification, analysis and quantification. Firstly an internal standard solution and ultrapure water are added into tobacco leaf powder, extract liquor passes through a filter film after ultrasonic extraction, then methanol is added, protein is removed through centrifugation after shaking, and supernatant is subjected to liquid chromatography-mass spectrometry. After standard solutions of compounds to be detected with different concentration gradients are prepared by adopting a mixing preparation method, and the liquid chromatography-mass spectrometry is carried out, standard curves of instrument responses of the compounds to the actual concentrations of the solutions are drawn, curve equations are fitted, and the detection concentrations are calculated according to measured values of the instrument responses of the compounds to be detected and converted to the actual concentrations of the compounds to be detected in tobacco samples. The detection method provided by the invention can be used for carrying out the qualitative and quantitative analysis on alkaloids and nitrosamines in the tobacco samples simultaneously, and is easy and convenient to operate, good in reproducibility, high in analytic sensitivity and accurate in quantification.

The invention discloses a testing apparatus for preparing a large-diameter remolded soft clay sample. The testing apparatus comprises a main bracket, wherein a support platform is arranged on the main bracket; a filter-press container is arranged on the support platform; a filter device and a filter water collection device are arranged at the bottom of the filter-press container; a bearing plate is arranged above the filter-press container; the bearing plate is aligned with the filter-press container and is fixed on a pressing bracket; the pressing bracket comprises a vertical rod which runs through a through hole on the support platform and extends downwards; a bearing rod is arranged at the lower end of the vertical rod; at least two lug plates are fixed at the lower end of the support platform; levers are connected on the lug plates in a swinging manner; weight racks are arranged at the front ends of the levers; balancing weights are sleeved at the back ends of the levers; and the levers are erected on the bearing rod. The testing apparatus disclosed by the invention is simple and reasonable in structure and convenient to operate, an is applicable to a model test of strengthening a soft foundation through combination of indoor vacuum preloading method and electro-osmosis method; and bending condition of a plastic drainage plate as well as change rules of vacuum degree and pore water pressure in soil in a soil consolidation process can be reflected more visually.

The invention provides a sample preparation system of carbon-14 in a solid sample and belongs to the field of a radioactive sample preparation system. The sample preparation system is of an overall integrated cabinet type structure. All parts are arranged in an integrated cabinet. Compressed gas in the sample preparation system is controlled by a gas intake micrometering valve, an automatic valve, a pressure sensor and a mass flow meter and enters a buffering device and a sample tube. Pyrogenic decomposition is carried out on a sample in a decomposition bed in the aerobic atmosphere. A catalyzing bed is used for catalyzing the oxidized gas with heat and the gas is cooled by a cooling device. Tritium adsorption and water processing are carried out through a silica gel adsorption bed. The gas enters absorbers which are connected in series in three levels to be adsorbed through flow control. The re-processed gas is exhausted by a vacuum pump. According to the sample preparation system of the carbon-14 in the solid sample, a computer interface can be directly used for controlling a sample preparation process. In an automatic operation process, an operator can conveniently intervene in the whole operation process after authority of the operator is approved. The sample preparation system of the carbon-14 in the solid sample is economical, practical, capable of saving the energy and protecting the environment, high in practicability, capable of conveniently replacing parts, easy to clean and capable of achieving small scale and automation.

The invention discloses a method for determining the contents of monomers of an ENB (ethylidene norbornene) type ethylene-propylene-diene monomer rubber and for aviation fuel solid nuclear magnetic resonance analysis. The method comprises the steps of determination of detected objects, preparation of a detected sample, selection of detection conditions, implementation of nuclear magnetic detection, and processing of detection data, wherein ethylene, propylene and ethylidene norbornene of the ethylene-propylene-diene monomer rubber are taken as the detected objects; the detected sample is subjected to pre-weighing and small block cutting treatment; a solid nuclear magnetic resonance spectrometer is adopted, and an acquisition method is carbon monopulse and hydrogen-decoupled pulse sequences; and after belongingness of spectral peaks and integration of spectral peak areas, the detection data is obtained through formula calculation. With utilization of the solid nuclear magnetic resonance spectrometer, with the monomers of the ethylene-propylene-diene monomer rubber as the detected objects, and through sample preparation, spectrogram acquisition, spectral peak belongingness, integration processing and formula calculation, the mass percentage contents of the monomers of the sample are obtained. The method has the advantages of convenient operation, safe use, accurate detection data and scientific experimental method, simplifies the experimental steps, and saves detection costs.

The invention discloses a 7A05 aluminum alloy corrosion solution. The 7A05 aluminum alloy corrosion solution is prepared by adding certain amounts of nitric acid, hydrochloric acid and hydrofluoric acid into distilled water, and comprises the following ingredients by volume: 3.5% of nitric acid, 2.5% of hydrochloric acid, 10.5% of hydrofluoric acid and the balance of distilled water. During preparation of the 7A05 aluminum alloy corrosion solution, nitric acid, hydrochloric acid and hydrofluoric acid are added in sequence. After the 7A05 aluminum alloy corrosion solution is utilized for corroding a 7A05 aluminum alloy, grain boundaries and grains of the corroded 7A05 aluminum alloy are clearly displayed; the corrosion effect is relatively good, the metallographic specimen preparation period is greatly shortened, and the corrosion period is relatively short.

The invention discloses an observation aid for high-temperature laser scanning confocal microscope samples and a using method thereof. The aid comprises a seat body, bolts and a wafer sample, whereinthe seat body is cylindrical; a plurality of through threaded holes are circumferentially and uniformly formed in the seat body; the bolts are meshed in the threaded holes; the bolts are formed by topping and grinding traditional bolts; placing grooves are formed in the top surfaces of the bolts; and wafer samples are fixedly connected in the placing grooves. The using method comprises the steps of sample mounting, sampling grinding and sample observation. The observation aid has the following beneficial effects that the cylindrical seat body is easy to be handheld for polishing, so that the grinding and polishing of multiple wafer samples at one time are convenient and benefit is brought to improve the surface quality and flatness of the wafer samples; and the fingers are prevented from being in direct contact with the samples and the wafer samples are easier to be uniformly stressed in the grinding process, so that the thickness uniformity of the samples is ensured. The aid is capable of observing the surface grinding corrosion conditions of multiple samples at the same time under a high-temperature laser confocal room-temperature microscope.

Disclosed in the invention is a preparation method for a TEM sample. An inclined cutting opening is formed in a chip sample surface by using an ion beam and level removing and TEM sample preparation are carried out on a target area position directly, so that time for TEM sample preparation is substantially shortened; and the position and depth for level removing are controlled precisely, so that the success rate of sample preparation and the quality of the sample are improved. And the chip sample is protected from being damaged.

The invention belongs to the field of hard clay sampling, and particularly relates to a hard clay undisturbed three-axis sample preparation device and a using method thereof. The device comprises a support, wherein a base is arranged at the bottom of the support; a bottom plate is arranged on the base; a lower fixing disc is arranged in the middle of the bottom plate; an upper fixing disc is arranged at a position above the lower fixing disc; the upper fixing disc is connected with a guiding rod; the guiding rod penetrates through a tool cap; the tool cap is connected with a hollow spiral tool; the tool cap is in threaded connection with a feeding guide track; the feeding guide track is a threaded rod, penetrates through the top of the support and then is connected with an output end of a stepping motor; and the stepping motor is positioned on the top of the device and is controlled by a controller. The hard clay undisturbed three-axis sample preparation device is skillful in structural design; the size and perpendicularity of a soil sample can be controlled accurately; success rate of soil sample preparation is high; sample preparation time is saved; the sample preparation efficiency is greatly improved; and the business application value is high.

The invention discloses a photocatalytic hydrogen production catalyst and a preparation method thereof. The catalyst is h-BN(x, t), 1/6<=x<=1/48, 30min<=t<=50min, x is the proportion of boric acid tourea, and t is microwave heating time. The preparation method includes the steps: sufficiently dissolving the boric acid to the urea by the aid of deionized water, drying mixture into a drying oven, and transferring steamed samples into a mortar to grind the samples; transferring the grinded samples into an aluminum oxide crucible with the volume of 25 milliliters, placing the whole samples into an aluminum oxide crucible with the volume of 50 milliliters, covering the samples by aluminum silicate, placing the samples into an aluminum oxide crucible with the volume of 200 milliliters, coveringthe samples with copper oxide, transferring the samples into a microwave oven to heat the samples for 30-50 minutes to obtain a finished product. The catalyst has good photocatalytic hydrogen production activity and practical application prospects.

The invention relates to a method for manufacturing multilayer nanowires by a template electrochemical synthesis technology. Three plating baths are adopted, and a three-electrode system is utilized for performing control-potential deposition; a secondary anodised aluminum film electrode is put into the NiFe plating bath, control-potential deposition is carried out on NiFe alloy, the NiFe alloy is ultrasonically cleaned and is rapidly converted into the Cu plating bath, control-potential deposition is carried out on Cu, the Cu is ultrasonically cleaned and then is rapidly converted into the Co plating bath, control-potential deposition is carried out on Co, the Co is ultrasonically cleaned and is rapidly converted into the Cu plating bath, control-potential deposition is carried out on Cu, control-potential deposition of the NiFe, the Cu, the Co and the CU is taken as one period and repeated, and the NiFe/Cu/Co/Cu multilayer nanowires are obtained. The manufactured NiFe/Cu/Co/Cu spin-valve multilayer nanowires are good in GMR effect, a high-density magnetic random access memory, a GMR magnetic reading head, a high-sensitivity magnetic sensor and the like can be manufactured, and the method has the wide application prospect in the fields of information memory, automatic measuring and the like.

Disclosed is a method for measuring dislocation density of steel through the electron back-scattered diffraction (EBSD). The method includes preparing standard samples and a plurality of to-be-testedsamples, sequentially placing the samples in an scanning electron microscope with the EBSD, scanning the samples and recording scanning data, processing the scanning data, determining interfacial density Pi(standard) of small-angle interface of the standard sample and interfacial density Pi of small-angle interface of the to-be-tested samples, measuring dislocation density d (standard) of the standard sample, calculating the constant k by the formula d(standard)=k*Pi(standard), and then calculating the dislocation density of the to-be-tested samples by the formula d=k*Pi. Compared with the other conventional method for measuring dislocation density, the method is much convenient and accurate, and can measure and compare the dislocation density of different steel products visually.

The embodiment of the invention discloses a wafer failure analysis method, which comprises the steps of determining a target test area in a cutting channel of a wafer, the wafer comprising a driving wafer layer and an array wafer layer which are stacked, wherein the array wafer layer comprises a stacking layer located on the driving wafer layer and a substrate located on the side, deviating from the driving wafer layer, of the stacking layer, and the target test area comprises a through contact penetrating through the array wafer layer and a test structure formed in the driving wafer layer andlocated below the through contact; performing protection processing on the surface of the through contact to obtain a wafer after protection processing; etching the substrate, located in the array wafer layer, in the wafer after the protection processing to obtain a wafer after the etching processing; and performing failure analysis on the wafer after the etching processing.

The invention discloses a novel Mn-4%Al-La-Sc alloy etchant solution. A preparation method of the etchant solution comprises the step of adding a certain amount of potassium hydroxide, hydrochloric acid and phosphoric acid to distilled water, wherein the compositions comprise, by mass, 9% of hydrofluoric acid, 4.5% of hydrochloric acid, 7.5% of phosphoric acid and the balance distilled water, and the adding sequence is that phosphoric acid is added in the first place, then hydrochloric acid is added, and finally hydrofluoric acid is added, and obtaining the etchant solution. By means of the etchant solution, metallographical corrosion of Mn-4%Al-La-Sc alloy can be made be as simple, fast and convenient as that of aluminum alloy, cost is saved, and the etchant solution is particularly applied to corrosion of the Mn-4%Al-La-Sc alloy.

The invention discloses a TC18 titanium alloy corrosion solution. The corrosion solution is prepared by adding a certain amount of nitric acid, oxalic acid and hydrofluoric acid into distilled water, wherein the volume ratio of hydrofluoric acid, oxalic acid, nitric acid and distilled water is 1: 2.5: 3: 5. During preparation, nitric acid, oxalic acid and hydrofluoric acid are added successively. After TC18 titanium alloy is corroded by the corrosion solution, the crystal boundary and the crystalline grain of the titanium alloy are clearly showed. The corrosion effect is good, the metallographic sample preparation time is greatly shortened, and the corrosion time is short.

The invention discloses a method for continuously and rapidly determining conventional elements and microelements in niobium and tantalum concentrates. The method comprises the following steps: fusing a sample by utilizing NaOH and Na2O2; after washing the sample with a NaCl solution, separating; taking sediment and a raw solution to determine respectively; finally, determining macro-elements by adopting a plasma spectral method, and analyzing and determining by adopting a method for determining the microelements through a plasma mass-spectrometric method. The method is simple and rapid, can be used for continuously determining 54 types of elements in one step, and has the advantages of accuracy in detection and low detection limit.

The invention belongs to the technical field of alloy material detection and analysis, and particularly relates to a method for preparing a GH4169 high-temperature alloy TEM (transmission electron microscopy) sample. The method aims at solving the technical problems that the existing method for preparing the GH4169 high-temperature alloy TEM sample is low in efficiency, and that the quality is poor. The method aims to provide the economical, efficient, convenient and fast method for preparing the GH4169 high-temperature alloy TEM sample. The method for preparing the GH4169 high-temperature alloy TEM sample is characterized by comprising the following steps that after the thickness of a GH4169 high-temperature alloy sample is reduced to 70 to 80 mu m, an electrolysis double-spray method isused for thinning; used electrolyte is a mixed solution of 10-percent perchloric acid and 90-percent absolute ethyl alcohol. The TEM sample prepared by the method has high surface quality and large thin regions; the method is very applicable to the large-batch preparation of high-quality GH4169 high-temperature alloy TEM samples.

The invention discloses novel 45CrNi4VA steel corrosion solution. The novel 45CrNi4VA steel corrosion solution comprises mixed acid; the mixed acid is prepared by adding a certain quantity of hydrofluoric acid, hydrochloric acid and alcohol in distilled water, wherein the volume fractions of the components are 4.5% of hydrofluoric acid, 8% of hydrochloric acid and 2% of alcohol; the balance is the distilled water; and the adding sequence of the components is nitric acid, hydrochloric acid and alcohol. The prepared corrosion solution can enable the gold phase corrosion of 45CrNi4VA steel to become simple and quick, saves the cost, and in particular, is suitable for the corrosion of the 45CrNi4VA steel.

The invention discloses a method for judging abnormal reasons of a solar cell based on PL test, which comprises the following steps of S1, vertically turning a silicon wafer subjected to wet etching through a turning windmill, horizontally outputting the silicon wafer through a blanking belt, selecting the silicon wafer on a specified pass, and directly carrying out double-sided coating passivation and printing sintering treatment to form a to-be-tested silicon wafer, and S2, performing PL test and judgment on the to-be-tested silicon wafer, and if a dark strip-shaped region appears in an image of the PL test, judging whether the dark strip-shaped region is a front roller mark of a wafer turning windmill or a wet etching blanking belt mark according to the direction of the dark strip-shaped region, thereby deducing a corresponding abnormal part. The method can achieve the quick recognition and judgment of the abnormal machine in a high-efficiency solar cell long-process production line, and reduces the abnormal time and the abnormal impact.