148results about "Preparing sample for investigation" patented technology

The invention relates to a device suitable for ring shear test and soil sample preparation of a vertical shearing surface. The device comprises a shearing box, a lifting system, a power rotating system, a monitoring control system, a soil sample preparation system and a frame, wherein shearing plates are uniformly fixed on an annular base plate along the radial direction of the annular base plate; an outer cover of the shearing box is covered on the annular base plate and the shearing plates and is assembled and fixed with the annular base plate through a guide strip and a guide slot; the outer cover of the shearing box is connected with a rotating force arm of the power rotating system and is used for transmitting torque; a coupling pressing plate is aligned and embedded into a central hole of a top plate of the outer cover of the shearing box and is driven by the lifting system to load normal force; the annular base plate is aligned and embedded into a cylindrical support platform; and under the effect of driving torque, an inner cylindrical side wall generated by the circling motion of the annular base plate under the driving of the shearing plates is the vertical shearing surface. According to the invention, the shearing displacement and the uniform distribution of the shearing stress on the shearing surface can be guaranteed, the thickness of the vertical shearing surface is not limited and the device has the functions of sample preparation and vertical shearing test.

The invention discloses a larva paraffin section forming method, and belongs to the technical field of microscopic tissue sections. The method comprises the following steps: fixing tissue, dehydrating the tissue, clearing the tissue, soaking with paraffin, embedding, slicing, unfolding, pasting, removing paraffin, and rehydrating the tissue. The operation is simple, and the consumed time is short; the tissue distinction degree of sections is high finally, and the complete space structure of a larva body can be observed; the method is suitable for larva body materials which are soft in body, high in liquid content and high in cavity proportion. When the method is adopted for processing a three-year cotton bollworm larva body, the body walls are complete when being observed at a bright field, and muscle tissues, nerve tissues and the like in body cavities are distributed, a digestive duct structure, which is in a large ratio of the body, is clear and complete, and a pair of pleopods are normal in space structure; the excitated spontaneous green fluorescence level of each organ tissue can be observed under blue light excitation.

The invention discloses a preparation method of a copper alloy spectral standard sample. The copper alloy spectral standard sample comprises the following elements by weight percent: 0.09-2.50% of Si, 0.40-4.70% of Ni, 0.018-0.55% of Fe, 0.004-0.17% of Pb, 0.03-1.20% of Mn, 0.008-0.60% of Sn, 0.004-0.10% of Al and 0.04-1.60% of Zn. The preparation method comprises the following steps of: preparing materials, smelting, casting an ingot, performing homogenizing treatment and lathing the skin. The copper alloy spectral standard sample contains not only copper, but also a defined amount of Si, Ni, Pb, Fe, Mn, Zn, Al and Sn elements and can meet the requirements of the chemical composition analysis and control of the copper alloy.

The invention relates to an acquisition system for collecting particles of different particle size discharged by fire coal. The acquisition system comprises a flue gas collecting box, a flue gas pipeline, a slide plate with wheels, a civil coal-fired furnace, a blower, a frequency converter, a condenser tube, a temperature sensor, a MCI sampler and a MOUDI sampler. The flue gas collecting box, the flue gas pipeline and the slide plate with wheels are made of stainless steel; the civil coal-fired furnace is put inside the flue gas collecting box; the blower can blow air into the flue gas collecting box to dilute flue gas and provide oxygen for combustion; and the particles in the air are filtered by a filter cloth of 120 meshes at the blower air inlet. The apparatus in the invention avoids the defects that original particles in the air cannot be purified to enter the acquisition system, dilution multiple of fire coal flue gas cannot be calculated and flue gas temperature cannot be adjusted, the original apparatus is not convenient for carrying and condensation enters into sampler flue gas etc. The experiment result shows that the effect of collecting particles of different particle size that are discharged by fire coal is obvious and the sampling operation is simple.

Tissue orientation devices include a perforated tissue support with at least one perforated channel for receiving a tissue sample, and a plurality of tabs configured to extend along and into the channel to retain the tissue sample during processing and embedding. Tissue orientation devices include elongated legs coupled together for holding one or more biopsy tissue samples therebetween. Associated methods include using the cassettes and orientation devices to hold and orient tissue samples for processing, embedding and microtome sectioning.

The invention provides a method for evaluating the protective capability of weathering steel rust layers based on freezing-unfreezing treatment. The method comprises the following steps of: (1) collecting various weathering steel samples to be measured and with rust layers; (2) performing freezing-unfreezing treatment on the weathering steel samples; (3) analyzing influence of the freezing-unfreezing treatment on change of fissures of the rust layer of each weathering steel sample; (4) analyzing influence of the freezing-unfreezing treatment on change of the alternating-current impedance fitting resistance value of the rust layer of each weathering steel sample; and (5) evaluating the protective capability of the rust layers of the weathering steel samples, determining that the protective capability of the weathering steel samples is high if the increment of the fissures of the rust layers and the change of the alternating-current impedance fitting resistance values of the rust layers of the weathering steel samples are low, and determining that the protective capability of the weathering steel samples is low if the increment of the fissures of the rust layers and the change of the alternating-current impedance fitting resistance values of the rust layers of the weathering steel samples are high. According to the method, destructiveness conditions of the outside are considered, particularly the capability of the rust layers resisting a frost environment in a northern cold region, the compactness of the weathering steel rust layers is judged from a brand-new angle, the protective capability of the weathering steel rust layers can be reflected really, and accordingly a judgment result is real and reliable.

A class of anionic oligomers and polymers that function for inhibition of nucleases, particularly RNase. Specific inhibitors include mixtures of oligomers of vinyl sulfate. Methods for inhibition or inactivation of one or more nucleases in vitro which comprises the step of contacting the one or more nucleases in a biological medium with one or more of the anionic oligomeric or polymeric inhibitors of this invention. Kits for carrying out a biological procedure, biological reaction and / or a biological assay containing one or more inhibitors of this invention. The use of oligomers and / or polymers of this invention as additives in buffers or reagents. The inhibitors of the invention can also be attached to surfaces to provide for removal of nucleases from media, solutions or other liquids in contact with the solid.

A device for collecting cells from a sample of biological fluid comprises first and second chambers (11, 3) that are releasably connected and which define a fluid flow path from the first chamber (11) to the second chamber (13). A porous membrane (14) is captivated between the first and second chambers (11, 13) when the first and second chambers (11, 13) are connected to each other, in the fluid flow path. An absorbent body (17) is positioned in close proximity to the downstream surface of the porous membrane (14), and a resilient member (18) is arranged to urge the absorbent body (17) towards the porous membrane (14). In use, a sample introduced into the first chamber (11) contacts the upstream surface of the porous membrane (14) and fluid is drawn through the porous membrane (14) and is absorbed by the absorbent body (17). Cells present in the sample are retained upon the upstream surface of the porous membrane (14). After separation of the first and second chambers (11, 13), the porous membrane (14) can be removed from the device for analysis of the deposited cells.

The invention relates to a matrix dispersion solid phase extraction method for detection of plasticizer in animal and vegetable oil samples. The method comprises the following steps: (1) packing an extraction glass centrifuge tube: weighing 0.1-5g of solid phase extraction filler in a glass centrifuge tube with a stopper to obtain an extraction glass centrifuge tube; (2) weighing, dissolving and extracting: weighing 0.1-5g of an animal or vegetable oil sample, dissolving with 1-10ml acetonitrile saturated n-hexane, extracting with 1-10ml n-hexane saturated acetonitrile twice, centrifuging, combining acetonitrile layers as to-be-purified liquid; and (3) purifying: transferring the to-be-purified liquid into the extraction glass centrifuge tube, sufficiently shaking, centrifuging at a rotation speed of 1,000-10,000 r / min, collecting supernatant, analyzing with GC-MS (gas chromatography-mass spectrometry), establishing a standard curve with a standard sample, and carrying out quantitative and qualitative analysis. The method provided by the invention is especially suitable for rapid detection of phthalates in animal and vegetable oil samples.