46results about How to "Sample preparation method is simple" patented technology

The invention discloses porous polyacrylonitrile fibers and a preparation method and application thereof. The porous polyacrylonitrile fibers which are controllable in diameter and have nanohole structures can be prepared by taking a ternary system of polyacrylonitrile, dimethyl sulfoxide and a pore-foaming agent as a spinning liquid by means of a wet process spinning method. The method disclosed by the invention is simple to operate and low in cost, and can obtain porous polyacrylonitrile fibers with the pore structures on the surface and inside. The porous polyacrylonitrile fibers have a wide application in the field of catalysis and adsorption.

The invention relates to the technical field of chemical analysis, and in particular to a powder sampling method for X-fluorescence analysis. The powder sampling method comprises the following steps: (1) covering a working tray with an XRF Mayra film, placing a plastic ring on the XRF Mayra film, and enabling the working tray to hold the plastic ring completely; (2) adding a powder sample into the plastic ring, flattening, and compacting to enable powder to be parallel to the opening of the plastic ring so as to obtain a product to be manufactured; and (3) pressing the product to be manufactured on a sample pressing machine, molding, removing the working tray, and tightly sealing one side directly contacting air, of a sample piece, by using a transparent adhesive tape, thereby obtaining a finished product. The powder sampling method provided by the invention is simple, convenient and rapid to operate, the prepared sample piece is good in quality and use effect, surface flatness and smoothness can be stilled maintained under X-ray radiation and an environment approximate to vacuum environments, and cracking can be avoided in the actual analysis process, so that an analysis cavity can be prevented from being polluted, light splitting crystal can be prevented from corrosion in analysis, and the sample analysis accuracy and the X-fluorescence use security can be greatly improved.

The invention relates to the field of experimental equipment for testing soil mechanical properties in geotechnical engineering discipline, in particular to a spinning type coarse-grained soil triaxial experiment sample preparation device and sample preparation method. The spinning type coarse-grained soil triaxial experiment sample preparation device comprises a base, a counter-force frame, a rubber membrane, a sample preparation cylinder, a spinning device, a water permeable plate and a sample cap, wherein the base comprises an upper layer of cylindrical bosses, a middle layer of cylindricalbosses and a lower layer of cylindrical bosses with different diameters, and the counter-force frame comprises an annular bottom plate, a rigid counter-force column and a counter-force cover plate. The sample preparation method by utilizing the sample preparation device comprises the following steps: binding the rubber membrane on the base; arranging the annular bottom plate on the periphery of the upper layer of cylindrical bosses in a sleeving mode; installing the sample preparation cylinder; preparing the soil materials; filling the soil materials layer by layer and compacting; taking outa soil sample. According to the method, on the premise that the coarse-grained soil structure is not damaged, the coarse-grained soil sample used for the triaxial compression test can be prepared in ashort time, and the device is simple in structure, convenient to use, capable of accurately controlling layering and the total density of the coarse-grained soil, uniform in sample preparation, economical and practical.

The invention belongs to the technical field of food chemistry, and specifically discloses a method for measuring the content of soybean isoflavone type components in soybeans and products thereof by using surface bonding baicalin magnetic nano-particles. The method comprises the following steps of: firstly, synthesizing amino terminal magnetic nano-particles and the surface bonding baicalin magnetic nano-particles; then preparing original solutions of the soybeans and the products thereof, adsorbing soybean isoflavone components by using the surface bonding baicalin magnetic nano-particles, separating the surface bonding baicalin magnetic nano-particles on which soybean isoflavone type compounds are adsorbed by using an external magnetic field, eluting soybean isoflavone from the surface bonding baicalin magnetic nano-particles, and adsorbing the surface bonding baicalin magnetic nano-particles together by using an external magnetic field; and finally, sucking the elution solution out to perform instrumental analysis. The method has the advantages of simplicity and convenience of operation, energy conservation and environmental protection.

The invention discloses a method for measuring 14C in a biological sample. The method includes the following steps that (1) the biological sample is pretreated, wherein the biological sample is frozen to be in the dry state and burned and absorbs a NaOH solution and finally the biological sample is converted into CaCO3 sediment; (2) a CO2 direct absorption method is used for preparing the sample, wherein CaCO3 powder obtained in the step (1) is dissolved in HCl and a measurement bottle cooled through an ice bath and containing liquid scintillation absorption mixed liquid is used for absorbing generated CO2; (3) a low-background liquid scintillation counter is used for measurement, wherein the sample is measured, so that the counting rate is obtained, and meanwhile the value of the SQP(E) is measured; quenching correction is conducted through an SQP(E) method and the specific activity of 14C in the biological sample is calculated. The method is rapid and accurate in operation and the lower detection limit of 14C specific activity in the biological sample can reach 0.0084 Bq/gC.

The invention provides a method for measuring agar gel strength through low-field NMR (nuclear magnetic resonance). The method comprises the following steps of: putting a certain number of agar powder samples into a nuclear magnetic tube; putting the nuclear magnetic tube into an NMR analyzer; measuring the spin-spin relaxation time T2 by using a CPMG (carr purcell meiboom gill) array; testing every sample for 3 times repeatedly; performing quick inversion by using inversion software to obtain the spin-spin relaxation time T2, wherein a corresponding linear relationship of the gel strength B and the spin-spin relaxation time T2 is as follows: T2=0.446+3.60*10<-5>B. Compared with a constant-pressure fracturing method and a texture analyzer or rheometer measuring method of the conventional agar measuring method, the defects that a sample preparing process is complicated, the measuring time consumption is high, influence caused by external factors is relatively large and the like are overcome and the method provided by the invention has the advantages of simple sample preparing method, no damage to samples, quick detection, accurate measuring result, good repeatability and the like.

The invention discloses a determination method of a carbon fiber pre-oxidized fiber skin-core structure. The determination method comprises following steps: erosion of a pre-oxidized fiber is performed using an etching agent, so that holes are formed via erosion in the inner side loose linear structure; and the inner side loose linear structure is observed via a scanning electron microscope (SEM) so as to determine hole diameter and fiber diameter, and quantitative characterization of the structure of the pre-oxidized fiber is realized. Operation of the determination method is simple and convenient; external interference is less; cost is low; determination time is short; quantitative calculation of core ratio can be realized; and influences caused by human factors are avoided.

The invention relates to a determination method for interfacial tension of a phase-separated polymer blend. The method comprises steps of preparing a polymer blend from two partially-mixable polymers through solution blending or mechanical blending; after the polymer blend is added into a commercial rheometer, heating up or cooling to a measurement temperature to perform annealing treatment with the measurement temperature being the temperature at which phase separation of the polymer blend generates; determining a linear viscoelastic region of the liquid-drop polymer blend having a structure of a "sea-island" shape by utilization of dynamic rheological measurement; subjecting a dynamic frequency scanning test to the polymer blend in the linear viscoelastic region; converting a dynamic frequency scanning curve obtained into a relaxation time spectrum with the time corresponding to the peak value of the relaxation time spectrum being the characteristic relaxation time of liquid drops; and obtaining the interfacial tension of two phases of the polymer blend by utilization of an incidence formula combining the characteristic relaxation time and the interfacial tension.

The invention relates to the technical field of identification for leather materials, in particular to a simple identification method for a leather fiber structure. The simple identification method includes: firstly, flattening an original leather sample and preconditioning for 48 hours in atmospheric conditions; secondly, fabricating the leather sample subjected to preconditioning to a section test sample, and standing in the atmospheric conditions; thirdly, placing the stood section test sample into a super-depth-of-field three-dimensional video microscope for visualization, and shooting microscopic images; and fourthly, identifying the leather fiber structure according to leather section microscopic characteristics displayed by the microscopic images. The simple identification method for the leather fiber structure has the advantages that complicated procedures of ultrathin section, dyeing and the like in a traditional tissue section process can be omitted, and the simple identification method is simple in sample preparation, small in leather fiber deformation, clear in edge contours and internal characteristics and capable of accurately reflecting the leather fiber structure, and the like.

The invention provides a determination method for dislocation density of large-size block iron and steel materials, which comprises the following steps of 1 preparing a standard test sample; 2 testing the standard test sample, determining magnetization rate x scale and coercive force Hc scale of the test sample, and further determining constant c scale of a standard test sample; 3 testing the standard test sample, determining the dislocation density rho scale of the standard test sample, and further determining the values of a coefficient b and a coefficient K; 4 preparing a test sample I to be tested; 5 testing magnetization rate x I and coercive force Hc I of the test sample; 6 jointly establish a formula x=c/Hc3 and a formula c=b+Krho, and obtaining the dislocation density rhoI; and repeating step 4-step 6 when testing a test sample II to be tested made of the same material and has the same preparation method with the test sample I to be tested. The determination method for the dislocation density of large-size block iron and steel materials has the advantages that a test result can reflect microscopic distribution of the dislocation density inside the test sample, and the method is simple, fast, easy to grasp and wide in use range.

The invention discloses a thin film sample preparation method for the (Energy-Dispersive X-Ray Fluorescence) analysis of trace amount of a plant sample. The milligram amount of the plant sample is prepared sequentially through the processes of cleaning, drying, grinding, weighing, conducting suction filtration, drying, pressing a sample and packaging. A thin film sample prepared by using the method is simple, convenient and efficient to operate, the surface of the thin film sample is flat and dense, the distribution of the sample is even, the sample does not crack in the actual measurement process, is applied to a plant or a plant tissue having less individual biomass, not only meets the requirements on the X-ray fluorescence analysis and research of the trace amount of the plant sample, is also favorable for reducing the matrix effect, and improves the analysis accuracy.

The invention discloses a fracture sample preparation method based on the crack resistance of a basalt fiber and asphalt mixture. The fracture sample preparation method based on the crack resistance of the basalt fiber and asphalt mixture comprises the following steps: molding a basalt fiber and asphalt mixture test piece by adopting a Marshall standard compaction technology, performing asphalt mixture split test under different temperature conditions, selecting a Marshall test piece section and a typical small sample after the test is completed, and observing the indirect tensile section andthe microscopic morphology by a digital camera, a scanning electron microscope and other optical instruments in order to observe the fracture morphology characteristics of the basalt and asphalt mixture macroscopically and microscopically. A fracture obtained by the sample preparation method has various morphologies, is clean and pollution-free, and has no interference from external human factors,and the relationship between the crack resistance of the asphalt mixture and the morphology of the fracture can be analyzed in order to further analyze the improvement mechanism fo the crack resistance of the basalt fiber reinforced asphalt mixture.

The invention relates to a sample preparation method of a high-purity aluminum bus metallographic sample. The sample preparation method comprises: step one, preparing a sample by using a cold mosaic method; step two, carrying out rough grinding; step three, carrying out fine grinding; step four, carrying out electrolytic polishing; step five, carrying out anode coating or electrolytic etching treatment on the sample after electrolytic polishing; and step six, carrying out tissue organization by using an optical microscope. The sample preparation method is suitable for a high-purity aluminum-based sample with the purity of more than 99.998%. The surface reaches a mirror surface effect by electrolytic polishing. The e grain boundary corrosion of the high-purity aluminum is accelerated by cooperating with the anode coating or electrolytic erosion process to realize a good corrosion effect; the grain boundary of the prepared metallographic sample is clear; the contrast comparison of the coating sample is clear; and a problem of difficult grain boundary corrosion of the high-purity aluminum bus is solved.

The invention belongs to the technical field of organic matter pore identification and discloses a quantitative characterization method for rapidly determining organic matter pores based on a scanningelectron microscope and an application thereof. The method comprises steps of determining the organic matter distribution position by using a scanning electron microscope; determining the type of themicrocomponents by using an energy dispersive spectrometer and an organic matter form; determining organic pores by utilizing the organic matter microcomponents, and determining the organic matter distribution position, determining the microcomponent type, and determining the organic pore development condition. The method is advantaged in that by adopting the scanning electron microscope to identify the organic matter microcomponents, problems of small observation vision field, high difficulty in finding organic holes, no development and long observation time when the scanning electron microscope is used for observing organic matter pores at present can be effectively solved, and experiment and scientific research efficiency is reduced; the scanning electron microscope =has advantages ofhigh magnification times, strong image stereoscopic impression and simple sample preparation method, the relationship between the organic matter pores and the microcomponents is established, an enrichment mode and morphological characteristics of each microcomponent and the contact relationship between each microcomponent and minerals can be directly observed, and the organic matter pores can be identified.

The invention relates to a method of analyzing the fission track annealing degree of apatite by employing terahertz time-domain spectroscopy. The method comprises the following steps of: performing heating and annealing experiments on various types of apatite samples, and putting the samples in a terahertz testing and analyzing device to be tested and analyzed to obtain an adsorption coefficient of the terahertz time-domain spectroscopy; representing the annealing degree subjected to the fission track of apatite in the samples by means of the adsorption index converted by the adsorption coefficient to establish a relationship plate between the adsorption index and the annealing temperature as well as the annealing time; and extrapolating experiment data to a geological history period according to the relationship plate, and analyzing the annealing degree of the to-be-tested sample and the annealing temperature and the annealing time subjected thereto. The method provided by the invention represents the fission track annealing degree of apatite for the first time by means of the absorption index of the terahertz spectroscopy, so that influence on the fission track research work caused by coarse grinding and improper polishing operations in a conventional method is avoided, and the requirement on the operating experience of an experimenter is reduced. The testing method is simple, the testing period is short, and the testing cost is low.

The invention discloses a method for determining solid content of ABS by continuous bulk polymerization process. A sample is added into a certain amount of a mixed solvent with stirring, in order to dissolve more fully, a micro amount of hydroquinone or TBC (p-tert-Butylcatechol) is added; after the sample is completely dissolved with strong stirring, and the sample is added into a methanol solution drop by drop; the sample is allowed to stand after fully mixing for demixing, and a polymer phase is separated by filtering; the polymer and a filter are placed into a baking oven for drying, and the polymer and the filter are placed in a dryer for natural cooling at room temperature; mass of solids is weighed, and solid content of the sample is calculated. The method can effectively prevent the problem that monomers and a few initiators are remained after treatment of the sample, which can influence the test results.

The invention provides a chip internal structure analysis method and a sample bearing device. The analysis method comprises the following steps of employing the focused ion beam technology to processa chip, and forming a measurement sample exposing a target layer; and analyzing the target layer of the measurement sample by adopting a secondary ion mass spectrometry analysis method to obtain analysis data. The chip internal structure analysis method is advantaged in that the chip internal structure analysis method can be used for preparing the measurement sample with the size suitable for thechip internal structure analysis method according to the requirements of subsequent measurement and analysis steps, a target layer cannot be damaged before analysis, the sample preparation method is simple, ample preparation difficulty is reduced, the chip internal structure analysis method can be suitable for samples with most structures, meanwhile, the target layer of the prepared measurement sample is exposed on the surface of the measurement sample, so in the measurement and analysis steps, high-energy primary ion beams can directly act on the target layer, measurement accuracy is greatlyimproved, the noise influence of an additional structural layer is avoided, and precision of quantitative analysis of elements with relatively low doping concentration is greatly improved.

The invention discloses a simple sample preparation method for testing the drawing behavior of fibers in a cement matrix. The method comprises the following steps: (1) cutting the fibers to a fixed length, then straightening and setting three mark points; (2) enabling the fibers to vertically penetrate through an elastic material, and enabling the two mark points on the fiber to be flush with the two side surfaces of the elastic material respectively; (3) cutting off redundant fibers exposed outside the elastic material along one side surface of the elastic material, and leaving the remaining mark point outside the elastic material; (4) pouring the stirred cement mortar into a mold, vibrating out bubbles, and smoothing the surface of poured mortar; (5) covering the mold with the elastic material, enabling ends of the fibers to be just in contact with the mortar, downwards inserting the fibers into the mortar, and enabling the mark point originally left outside to be flush with the adjacent side surface of the elastic material, so as to complete embedding of the fibers into the mortar; and (6) after standard curing to a specific age, carrying out a fiber pull-out test on a tension tester.