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.

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 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 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 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.