40results about How to "Low limit" patented technology

Nozzles and nebulizers that can be adjusted to produce an aerosol with optimum and reproducible quality based on the feedback information obtained using laser imaging techniques are provides. Two laser-based imaging techniques based on particle image velocimetry (PIV) and optical patternation are provided to map and contrast the size and velocity distributions for indirect and direct pneumatic nebulizations in plasma spectrometry. The flow field of droplets is illuminated by two pulses from a thin laser sheet with a known time difference. The scattering of the laser light from droplets is captured by a charge coupled device (CCD), providing two instantaneous images of the particles. Pointwise cross-correlation of the corresponding images yields a two-dimensional (2-D) velocity map of the aerosol velocity field. For droplet size distribution studies, the solution is doped with a fluorescent dye and both laser induced florescence (LIF) and Mie scattering images are captured simultaneously by two CCDs with the same field of view. The ratio of the LIF / Mie images provides relative droplet size information, which is then scaled by a point calibration method via a phase Doppler particle analyzer (PDPA). Two major outcomes are realized for three nebulization systems: 1) a direct injection high efficiency nebulizer (DIHEN); 2) a large-bore DIHEN (LB-DIHEN); and 3) a PFA microflow nebulizer with a PFA Scott-type spray chamber. First, the central region of the aerosol cone from the direct injection nebulizers and the nebulizer-spray chamber arrangement comprise fast (>13 m / s and >8 m / s, respectively) and fine (<10 μm and <5 μm, respectively) droplets as compared to slow (<4 m / s) and large (>25 μm) droplets in the fringes. Second, the spray chamber acts as a momentum separator, rather than a droplet size selector, as it removes droplets having larger sizes or velocities. Smart-tunable nebulizers may utilize the measured momentum as a feedback control for adjusting certain operation properties of the nebulizer, such as operating conditions and / or critical dimensions.

A method for fabricating a spin-valve GMR sensor having a reference layer with a magnetic moment that moves in an opposite direction to that of the free layer in the presence of external magnetic field transitions. The reference layer is a part of a three ferromagnetic layer structure, including pinned, intermediate and reference layers, that when the layers are taken pairwise and separated by spacer layers, includes a strongly exchange coupled synthetic ferrimagnetic pinned and intermediate layer pair and a weakly exchange coupled synthetic ferrimagnetic intermediate and reference layer pair. The reference layer, because of its weak coupling to the intermediate layer, has a magnetic moment that is free to move. During sensor operation, the reference layer and free layer move in opposite directions under the influence of external magnetic field transitions The novel three layer structure provides a sensor of increased sensitivity for a given track width.

The invention discloses a structural adhesive for steel bonding, which comprises a component A and a component B of which the quality ratio is 100:(15-65), wherein the component A comprises epoxy resin, diluter, plasticizer, toughener and couplant; and the component B comprises modified polyamide resin, modified fatty amine and amino terminated polyether. The structural adhesive has the advantages of favorable bonding property, uniform stress distribution, high shearing strength and good mechanical toughness, has the characteristics of no flow after plate bonding, large anchorage withdrawal resistance and limit of harmful substances far below the national technical index, has the characteristics of high durability, convenient construction and stable strength, and can well soak the concrete and well bond the concrete and steel plates. The invention has high application and popularization values.

The invention relates to polyurethane wood floor paint with a formaldehyde removing function and a preparation method thereof. The polyurethane wood floor paint is prepared by mixing hydroxyl components with NCO components according to a mass ratio of 1:(0.8-1.2), wherein the hydroxyl components comprise the following components in parts by weight: 50-60 parts of formaldehyde removing alkyd resin, 10-20 parts of castor oil alkyd resin, 4-5 parts of cyclohexanone, 5-18 parts of n-butyl acetate, 2-5 parts of ethyl acetate, 6-12 parts of xylene, 0.1-0.5 parts of a defoamer, 0.1-0.5 parts of a leveler and 0.1-0.5 parts of a dryer; the NCO components comprise the following components in parts by weight: 5-12 parts of xylene, 18-24 parts of n-butyl acetate, 8-10 parts of ethyl acetate, 30-40 parts of TDI-TMP (toluene diisocynate-trimethylolpropane), 5-15 parts of an HDI (hexamethylene diisocyanate) trimer, 15-20 parts of a moisture curing agent and 0.5-1 part of a dehydrating agent. The polyurethane wood floor paint prepared by the method has the formaldehyde removing function, and a coating is wear-resistant, impact-resistant and good in adhesive force.

The invention relates to a wall body structure formed by building blocks. A wall body comprises wall layers formed by the building blocks in a longitudinally connecting way. The wall layers are overlaid layer by layer. The building blocks of adjacent wall layers are arranged in a staggering way. Each building block is a longitudinal section and comprises a top surface, a bottom surface and two end surfaces. As a whole, the cross section of the building block is of downward horn mouth shape. A middle ridge is arranged at the top surface, the two sides are lower and a left supporting slope and a right supporting slope are formed. The top surface and the bottom surface are formed in a way that when a building block is overlaid with a lower similar building block to form a wall body, the left supporting slope and the right supporting slope of the top surface of the lower building block are in contact with the bottom surface of the building block, so the two building blocks are locked and the relative transverse movement is stopped. Since the building block has the shape and the dimension, when three similar building blocks are overlaid from top to bottom, the ridge of the lowest building block is higher than the bottom toe part of the top building block. Any surface of the wall body can prevent water leakage, the permeable soil keeping effect is good, the seismic stability is high and the wall body is suitable for a plurality of kinds of buildings and all kinds of construction methods.

A building block for forming a wall body is provided, in the wall body, a plurality of similar building blocks are continuously dislocation lapped, the building block is a vertical material comprising a top face, a bottom face and two end faces; a cross section of the building block is a face-down bellmouthing shape; the top face is provided with a middle ridge and two lower sides to form left and righ supporting slopes; the top face and the bottom face are formed by that, when the building block is lapped with a lower similar building block to form the wall body, the left and right supporting slopes of the top face of the lower building block are connected with the bottom face of the building block so that the two building blocks are locked. The building block provided in the invention, and an additional building block cooperated with the top face of the building block, an auxiliary building block cooperated with the bottom face of the building block, crossed building blocks and corner building blocks provided when the wall body are crossed, are capable of enabling any face the formed wall body to be prevented from water leakage or to penetrate water and leave earth, and to be aseismatic and stable, the invention is suitable for various buildings and various construction method; the invention also prescribes various applications of the building block.

The invention relates to matt polyurethane wood floor paint with a formaldehyde removing function and a preparation method thereof. The matt polyurethane wood floor paint is prepared by mixing hydroxyl components with NCO components according to a mass ratio of 1:(0.8-1.2), wherein the hydroxyl components comprise the following components in parts by weight: 50-60 parts of formaldehyde removing alkyd resin, 0-20 parts of castor oil alkyd resin, 0.1-0.5 parts of a dispersant, 0.1-0.4 parts of bentonite, 0.3-0.8 parts of polyethylene wax powder, 0.1-1 part of polyamide wax slurry, 2-6 parts of a matting agent, 2-5 parts of cyclohexanone, 5-13 parts of n-butyl acetate, 2-5 parts of ethyl acetate, 2-10 parts of xylene, 0.1-0.5 parts of a defoamer, 0.1-0.5 parts of a leveler and 0.1-0.5 parts of a dryer; the NCO components comprise the following components in parts by weight: 6-12 parts of xylene, 6-24 parts of n-butyl acetate, 3-10 parts of ethyl acetate, 15-30 parts of TDI-TMP (toluene diisocynate-trimethylolpropane), 20-40 parts of an HDI (hexamethylene diisocyanate) trimer, 6-15 parts of a TDI (toluene diisocynate) trimer and 0.5-1 part of a dehydrating agent. The matt polyurethane wood floor paint prepared by the method has the formaldehyde removing function, and a coating is wear-resistant, impact-resistant and good in adhesive force.

A method for fabricating a spin-valve GMR sensor having a reference layer with a magnetic moment that moves in an opposite direction to that of the free layer in the presence of external magnetic field transitions. The reference layer is a part of a three ferromagnetic layer structure, including pinned, intermediate and reference layers, that when the layers are taken pairwise and separated by spacer layers, includes a strongly exchange coupled synthetic ferrimagnetic pinned and intermediate layer pair and a weakly exchange coupled synthetic ferrimagnetic intermediate and reference layer pair. The reference layer, because of its weak coupling to the intermediate layer, has a magnetic moment that is free to move. During sensor operation, the reference layer and free layer move in opposite directions under the influence of external magnetic field transitions The novel three layer structure provides a sensor of increased sensitivity for a given track width.

A method and apparatus for detection of pteridine levels in a biological sample using CE-LIF which is useful for early cancer screening involving fully oxidizing pteridine compounds in a sample such as a urine sample, subjecting to CE-LIF to assess compound concentration, and compare to expected levels in for healthy or cancer-bearing patients.

A biosensor platform apparatus and method are provided that can detect, purify and identify nucleic acid (DNA and RNA) biomarkers in complex biological fluids. The methods use a two-stage molecular based approach. The first stage screens for specific nucleic acid-based biomarkers in complex biological fluids by electrochemical detection of DNA:RNA hybridization and facilitates the removal of remaining complex media constituents. The first stage utilizes probes within a tunable nanoporous electrode. The second stage identifies the purified specific hybrids by single-molecule conductance measurements via break junction scanning. Identification can be assisted with a library of conductance measurements. The methods can provide strain level information that can be used for identifying anti-microbial resistance in detected pathogens. Collection of RNA targets allows for biomarker detection and identification without the need for amplification and can provide information about the viability of the sample organism.

The invention provides a manufacturing method for manufacturing a magnesium alloy vascular stent, and the manufacturing method adopts a 3D (three dimensional) printing technology to solve the technical problems that an existing magnesium alloy stent is complex in process and high in cost during manufacturing. The manufacturing method comprises the following steps: adopting the 3D printing technology to manufacture a prefab of the magnesium alloy vascular stent; adopting magnetron sputtering for sputtering a magnesium alloy target to the surface of the prefab; soaking the prefab sputtered with the magnesium alloy target into an alcohol solution or an aqueous solution to dissolve the prefab, thereby obtaining the magnesium alloy vascular stent. The manufacturing method adopted by the invention simplifies the process, reduces the cost and has a wide application prospect. And a novel tunicamycin drug coating is adopted, so that formation of postoperative restenosis is reduced, and the curative effect and safety are improved.

The invention discloses a fire-fighting spraying device for a smart city large-scale supermarket center, and particularly relates to the field of smart cities. The fire-fighting spraying device comprises a connecting end, a control valve cavity is fixedly installed at the bottom end of the connecting end, a piston valve cavity is fixedly connected to one side of the control valve cavity, and a fire temperature sensing mechanism is fixedly installed at the bottom end of the piston valve cavity; a locking mechanism is arranged in the piston valve cavity, a splash box connecting base is fixedly installed at the bottom end of the control valve cavity, a rotary splash mechanism is fixedly installed at the inner side of the splash box connecting base, and the connecting end comprises a threadedconnecting end and a fastening nut; and by arranging a mechanical control assembly structure, a temperature sensing piston rod type fire disaster temperature sensing mechanism is used for sensing theenvironment temperature and automatically controlling locking and opening of the valve body, automatic spraying starting is achieved, a non-electronic control structure enables the device to be more stable in use, not prone to being interfered by the external environment and low in limited condition, frequent maintenance is not needed and maintenance cost is saved.

The invention relates to an environmental-friendly dry-hanging adhesive and a preparation method thereof. The environmental-friendly dry-hanging adhesive is prepared by mixing a main paint and a curing agent in a mass ratio of 2 to 0.8-1.2, wherein the main paint comprises the following components in parts by weight: 30-40 parts of epoxy resin, 1-6 parts of an epoxy active diluent, 1-5 parts of phenyl methanol, 0.5-2.5 parts of an anti-settling agent, 0.5-4 parts of bentonite, 10-20 parts of quartz sand, 20-50 parts of calcium triple superphosphate, 5-15 parts of talc powder, 0.1-0.6 part of synthetic fiber and 1-5 parts of epoxy carbon black slurry; and the curing agent comprises the following components in parts by weight: 30-40 parts of an amine-modified curing agent, 0.5-2.5 parts of an anti-settling agent, 0.5-4 parts of bentonite, 2-5 parts of titanium dioxide powder, 10-20 parts of quartz sand, 20-45 parts of calcium triple superphosphate, 5-15 parts of talc powder and 0.1-1 part of synthetic fiber. The environmental-friendly dry-hanging adhesive prepared by the preparation method disclosed by the invention has the advantages of very strong adhesion force, low cracking rate, water resistance, low content of harmful substances and good constructability.

A sample analysis method includes directing a sample that contains one or more SVOC components to a GC column to temporally separate components present in the sample. Output gas from the GC column is expanded into a sample cell. The sample cell is held at a temperature and pressure that are lower than the temperature and pressure at an outlet of the GC column. The volume of the sample cell is sufficiently large for maintaining the one or more SVOC components in a gaseous phase. Infrared spectra of the components in the sample cell are obtained using a Fourier transform infrared spectrometry system.

The activity of intracellular chemical reactions of molecules is measured by the use of fluorescently labeled substrate molecules that undergo a change in electrophoretic mobility upon chemical reaction such as that catalyzed by an enzyme. Specificity is achieved by using labeled substrate molecules that can be acted upon only by specific enzymes. Thus the activity of a specific enzyme or class of enzymes can be determined. Measurements are made with the intracellular presence of such substrate molecules, at some time of interest, typically after exposure of the cell to a stimulus that activates a particular enzymatic pathway. To ensure accuracy, measurements must be made in a timely manner so as to minimize chemical reactions occurring subsequent to the time of interest. Fast controllable laser lysis is used to obtain the contents of a single cell into which reporter substrate molecules have been introduced. The cell contents are then subjected to capillary electrophoresis and enzymatic activity is determined by comparing amounts of substrate molecules to amounts of enzymatically altered substrate molecules which are separated by the electrophoresis and identified by the presence of a fluorescent label.

Various methods, compounds and apparatus for the detection of analytes are provided. In one aspect, the direct oxidation of an alcohol is detected electrochemically. In another aspect, a reaction of an analyte is detected, wherein the reaction is catalysed by an enzyme and a cofactor, and wherein the cofactor comprises a moiety which is capable of acting as an electron mediator. In a further aspect, a chiral analyte is detected by resolving a enantiomeric mixture of the analyte and subsequently detecting at least one of the resolved enantiomers electrochemically. The invention is particularly relevant to the detection of alcohols, especially chiral alcohols.

The invention discloses a building block formed wall body structure, which comprises wall layers formed by longitudinally connecting building blocks, wherein the wall layers are overlapped layer by layer, and the building blocks between the adjacent wall layers are mutually staggered; the building block is made of longitudinal profile and comprises a top surface, a bottom surface and two end faces; the cross section of the building block has an integrally downward horn mouth shape; the top surface is provided with a middle ridge, and the two sides are low and form left and right support slopes; a concrete post is arranged in the wall body structure, and an overhanging block is arranged on the concrete post of the wall body and comprises a top surface, a bottom surface and two end faces, wherein one end face of the overhanging block is jointed with the concrete post, the other end face of the overhanging block is jointed with the building block, the top surface of the overhanging block is matched with the bottom surface of the upper building block, and the bottom surface of the overhanging block is matched with the top surface of the lower building block; and a plurality of overhanging blocks are sequentially arranged on the concrete post at intervals, and the plurality of overhanging blocks are jointed with the staggered and overlapped building blocks adjacent to the concrete post. Any one of surfaces of the wall body provided by the invention prevents water leakage or permeates water and holds soil, and meanwhile the wall body is earthquake-proof and firm and is applicable to various buildings and various construction methods.

The invention provides a producing method of a novel environment-friendly plate, which comprises the following steps: a) mixing and paving waste epoxy resin powder and an adhesive, and sequentially performing prepressing and hot pressing to form a composite plate, and b) sequentially performing airing and finished treatment on the composite plate obtained in the step a) to form the novel environment-friendly plate, wherein the adhesive comprises an isocyanate adhesive, paraffin and antimonous oxide. Compared with the prior art, the novel environment-friendly plate is prepared through the specific technical steps by taking the waste epoxy resin powder (HW13 organic resin waste) as a principal raw material under the action of the specific adhesive; the waste is changed into valuables; the obtained novel environment-friendly plate has higher mechanical properties and combustion performance simultaneously and is low in release amount of soluble heavy metals and formaldehyde.

The invention discloses a characteristic nucleotide sequence, nucleic acid molecule primers and a method for quantitative determination of cordyceps guangdongensis. The characteristic nucleotide sequence for quantitative determination of cordyceps guangdongensis is as shown in SEQ ID NO. 2. The nucleic acid molecule primers for quantitative determination of cordyceps guangdongensis are shown as follows: FS: 5'-GCTCCGATTCGATGGC-3'; RS: 5'-TACAGCAGGCAGGTGGC-3'. When the nucleic acid molecule primers FS and RS of the invention are applied to fluorescence PCR amplification, a fluorescence signal is excited only in cordyceps guangdongensis, while other cordyceps such as cordyceps sinensis, cordyceps militaris and ramous cordyceps are free from Ct value when the number of cycles is less than 35, showing that the nucleic acid molecule primers FS and RS of the invention are quite high in specificity and are suitable for rapid adulteration and content detection of cordyceps guangdongensis (mycelium and fruiting body) and related products thereof.

The invention discloses a root-resistant environment-friendly single-component polyurethane waterproof coating and a preparation method thereof, and relates to the technical field of waterproofing of building engineering planting, and the root-resistant environment-friendly single-component polyurethane waterproof coating comprises 18-25% of polyether, 3.5-4.5% of isocyanate, 10-15% of a plasticizer, 30-45% of pigment and filler, 0.1-0.2% of a dispersant, 3-5% of a chain extender, 0.1-0.2% of a catalyst, 0.1-0.2% of a defoaming agent, 0.2-1% of a root-resistant agent and 8-10% of a solvent. Compared with a traditional product, the physical performance indexes such as strength and elongation of the root-resistant environment-friendly single-component polyurethane waterproof coating are remarkably improved, the root-resistant agent is added into the product, growth of plant roots can be effectively prevented, meanwhile, the normal growth requirement of plants can be met, and the root-resistant effect is achieved. The product does not contain harmful substances, is low in heavy metal content and is harmless to human bodies and the environment. And construction is convenient, the waterproof layer can be used after the barrel is opened on site, and a seamless high-strength root-puncture-resistant waterproof layer can be formed.

The invention relates to elastic epoxy polyurethane wood floor paint and a preparation method thereof. The elastic epoxy polyurethane wood floor paint is prepared by mixing a hydroxyl component and an NCO component in a mass ratio of 1 to (0.8-1.2), wherein the hydroxyl component comprises the following components in parts by weight: 70-80 parts of epoxy resin, 4-20 parts of xylene, 4-20 parts of propylene glycol methyl ether acetate, 0.1-0.5 part of a defoaming agent, 0.1-0.5 part of a flatting agent and 0.1-0.5 part of drier; and the NCO component is a curing agent. The elastic epoxy polyurethane wood floor paint prepared by the method has the advantages of high strength, high elasticity, high abrasion resistance, impact resistance and good adhesion, has excellent vibration absorbing performance and self-healing performance, is capable of improving the comfortable degree, preventing slippage and reducing noise when people walks, has excellent application property and a very low limited quantity of harmful substances.

The invention discloses a method for measuring residual quantity of diethylstilbestrol in aquatic products by utilizing a liquid chromatogram fluorescent method, comprising the following steps: (1) weighing 100g of ground aquatic product samples in a 50mL plastic centrifuge tube, adding 20mL of acetic ether, homogenizing for 230s, centrifuging for 10min with the speed of 7000r / min, moving the acetic ether layer to a 100mL pear-shaped flask, utilizing 2mL of normal hexane and acetic ether with a volume ratio of 85:15 to dissolve residue, and then stirring for 6min; (2) activating an SLH column by utilizing 5mL of normal hexane and 5mL of acetic ether, adding extracting solution on the SLH column, utilizing 10mL of normal hexane and acetic ether with the volume ratio of 82:20 to elute by controlling the flow rate at 2mL / min, collecting eluent, carrying water bath at the temperature of 450 DEG C, and then carrying out nitrogen drying till the original state; and (3) adding 1mL of sulfuric acid to the centrifuge tube of nitrogen drying, then adding 8mL of water in the centrifuge tube, utilizing 1mL of mobile phase for metering volume so as to be measured by an efficient liquid phase chromatogram. The method for measuring residual quantity of diethylstilbestrol in aquatic products has advantages of low cost, simple method, and low measuring limit, is suitable for popularization and use in the production and practice and is a technology demanded by the market, and has positive social meaning and social demand.

The invention relates to a non-polar polymer negative poisson ratio foamed material and a preparation method thereof, belongs to the technical field of functional polymer foamed materials, and aims tosolve the technical problems that in the prior art, a preparation method of a negative poisson ratio foamed material is tedious in preparation process, low in preparation efficiency and unbeneficialto large-scale production and has limits on polymers. The preparation method provided by the invention comprises the following steps: firstly, performing composite molding on a non-polar polymer and ahydrophile so as to prepare a composite material, putting the composite material into foaming equipment, introducing a physical foaming agent and water, and carrying out rapid pressure release at a saturation temperature of 80-180 DEG C at saturated pressure of 3-25 MPa in a saturation time of 0.5 hour or longer, thereby obtaining the non-polar polymer negative poisson ratio foamed material. According to the method, the negative poisson ratio foamed material is prepared from the composite material according to a one-step method, the method is simple in preparation process, high in preparationefficiency, high in security, environmentally friendly and applicable to large-scale production, and a large-size negative poisson ratio foamed material can be prepared.

The invention relates to an elastic epoxy polyurethane matte wood floor paint and a preparation method thereof. The elastic epoxy polyurethane matte wood floor paint is formed by mixing a hydroxyl component and an NCO component at a mass ratio of 1:0.8-1.2 , wherein the components and parts by weight of the hydroxyl component are as follows: 70-80 parts of epoxy resin, 0.1-0.5 parts of dispersant, 0.1-0.9 parts of fumed silica, 0.3-0.9 parts of polyethylene wax powder, poly Amide wax slurry 0.1-1 part, matting powder 0.1-0.9 part, xylene 4-20 part, propylene glycol methyl ether acetate 4-20 part, defoamer 0.1-0.5 part, leveling agent 0.1-0.5 part, dry Agent 0.1-0.5 parts; wherein the NCO component is the curing agent. The elastic epoxy polyurethane matte wood floor paint prepared by the invention has the characteristics of high strength, high elasticity, high wear resistance, impact resistance and good adhesion.

A biosensor platform apparatus and method are provided that can detect, purify and identify nucleic acid (DNA and RNA) biomarkers in complex biological fluids. The methods use a two-stage molecular based approach. The first stage screens for specific nucleic acid-based biomarkers in complex biological fluids by electrochemical detection of DNA:RNA hybridization and facilitates the removal of remaining complex media constituents. The first stage utilizes probes within a tunable nanoporous electrode. The second stage identifies the purified specific hybrids by single-molecule conductance measurements via break junction scanning. Identification can be assisted with a library of conductance measurements. The methods can provide strain level information that can be used for identifying anti-microbial resistance in detected pathogens. Collection of RNA targets allows for biomarker detection and identification without the need for amplification and can provide information about the viability of the sample organism.