175 results about "Uv absorption" patented technology

The invention provides hard wax oil prepared from the following components in parts by weight: 40-80 parts of vegetable oil, 3-15 parts of biological wax, 5-15 parts of rosin glycerol resin, 0.2-1.0 part of drier, 0.1-0.5 part of anti-skinning agent, 0.1-0.3 part of mixed UV (Ultra-Violet) absorber and 0.1-0.3 part of defoaming agent. The preparation method of the hard wax oil, which is provided by the invention, comprises the steps of generating bodied oil with relatively smaller molecular weight under the action of nitrogen protection and adding an oil-based UV absorber with synergy and a hindered amine light stabilizer, and thus the UV absorption performance of the hard wax oil is improved. The prepared hard wax oil is suitable for outdoor woodenware products, has good weatherability, favorable water resistance and ideal durability effect under the condition that sunlight and UV rays exist, and the hard wax oil hardly sags and has tough firm formed in coating construction, belongs to natural coatings, accords with the environmental protection requirement and can be also used for decorating private indoor rooms.

A composite SiO2-metal nanoparticle with a core-shell structure for the photothermal therapy of cancer is composed of a SiO2 nanoparticle as core and a coated metal layer as shell, and has the maximal extinctivity (300-2000 nm in wavelength) and the maximal UV absorption (300-2000 nm in wavelength). It's preparing process features that a molecular cross-linking agent is used for cross-linking between SiO2 and metal layer, the metallic nanoparticles are physically adsorbed onto surface of SiO2 nanoparticle, and the solution of relative metal is chemically reduced to cover on the residual surface of SiO2 nanoparticle.

A cost efficient and reliable method for online sorting of special glass which works independent of the color of glass and the shape of the material. The scrap glass stream to be detected is thereby irradiated by UV absorption or transmission values of the scrap glass stream, more specifically of the material-specific UV absorption edges and “UV-cutoff” frequencies., with reference values obtained before from standardized material laboratory inspections. If special glass is being detected, blowing nozzles disposed downstream of a detector unit divert the special glass toward a predetermined location where it is deposited. There can also be a system which includes a radiation source, a detection unit, an evaluation and control unit and a removal apparatus.

An ultraviolet light absorbing composition comprises first and second benzotriazoles having different UV absorption characteristics. The weight ratio of the first benzotriazole to the second benzotriazole is at least about 0.05:1 and at most about 20:1.

The PbO-free UV-absorbing glass is made under oxidative conditions and has a composition, in % by weight, of: SiO2, 55-79; B2O3, 3-25; Al2O3, 0-10; Li2O, 0-10; Na2O, 0-10; K2O, 0-10; MgO, 0-2; CaO, 0-3; SrO, 0-3; BaO, 0-3; ZnO, 0-3; ZrO2, 0-3; CeO2, 0-1; Fe2O3, 0-1; WO3, 0-3; Bi2O3, 0-3; MoO3, 0-3; ΣLiO+Na2O+K2O=0.5 to 16 and ΣMgO+CaO+SrO+BaO+ZnO=0-10. It also contains from 0.1 to 10% TiO2 with at least 95% of the titanium as Ti+4 so that it has a high visible transmission, reduced color centers, and a sharp UV absorption edge. It is especially useful in lamps display devices and glass-to-metal seals.

A composite spherical active carbon adsorbent is prepared by the following raw materials by weight: 100-120 parts of active carbon, 20-25 parts of clay, 6-8 parts of glyceryl triacetate, 15-20 parts of wooden saw dust, 5-7 parts of eleaostearic acid, 15-20 parts of walnut shell, 7-9 parts of polyacrylamide, 3-5 parts of titanium dioxide, 4-5 parts of modified diatomite, and a proper amount of water. The spherical active carbon adsorbent has advantages of reasonable composition, novel preparation technology and simple equipment structure, the prepared finished product reaches an ideal effect on the indexes of compressive strength, powder drop rate, iodine adsorption, benzene adsorption and desulphurization; and the spherical shape makes it easy for the adsorbent to flow, and makes it convenient for the adsorbent to be subpackaged and packaged by using current various packaging equipment. Titanium dioxide is used to make the adsorbent provided by the invention have advantages of very strong UV absorption performance, infrared reflection characteristic, self-cleaning performance, and sterilization and deodorization in the medical field.

A dress having the capbility of UV absoption, the method of making UV absorption fiber and cloth, and a UV absorption compound. A method of forming a cloth includes a step of preparing polymer based material and dyne, followed by mixing the polymer based material and dyne with a ratio. Melting step is performed to melt the polymer based material, and the dyne and the dyne is distributed within the material uniformly. A drawn-work is performed to form a initial cloth which includes the UV absorption material.

A UV absorption spectrometer includes a housing, a controller, and a sensor unit including an ultraviolet light source, an analytical area in an analytical cell or in running water or gaseous medium, and an UV wavelength separator including a UV detector. An ultraviolet light in a wavelength range of 200-320 nm emits from the light source through the analytical area to the wavelength separator, and the controller transforms output signals from the UV detector into absorbance values or optical densities for two or more wavelengths in the wavelength range, calculates differences of said absorbance values or optical densities, determines a concentration of a chemical in the solution with calibration constants found for a known concentration of the chemical and said differences of said absorbance values or optical densities.

The present invention discloses a near-infrared hydrazine ratio fluorescence probe, and the probe is dicoumarol-containing 4 - (2 '- carboxyl phenyl) - 2 - (7' - diethylamine coumarin) - 7 - diethylamino benzo pyran perchlorate with the chemical structural formula shown in formula (I). The probe can selectively effect with N2H4 to change from green to yellow, can be distinguished by the naked eye, fluorescence changes from red to blue-green, and fluorescence ratio response effect is very good, and can also be analyzed by UV absorption and fluorescence spectrometry. N2H4 ratio detecting can be achieved, intracellular ratio imaging can be achieved, and the content of the gaseous N2H4 can be quickly detected by the naked eye by use of a prepared silica gel plate. The probe is expected to play a role in industrial production and biological sciences, and has broad application prospects.

This invention improves the PAMPA (parallel artificial membrane permeability assay) method used in pharmaceutical, biotechnological, and agrochemical R&D. This new high-throughput method and apparatus for measurement of permeability and membrane retention of compounds overcomes shortcomings of prior art and includes sensitivity and speed enhancing reagents. The phospholipid membranes used here consist of 10–74% wt / vol soybean lecithin extract dissolved in dodecane. Concentrations are measured by direct UV spectroscopy. To reduce membrane retention, surfactants, cyclodextrins, or water-soluble lipophilic polymers with low UV absorption are used in the acceptor comparment of the permeation cells and create an artificial sink state. A pH gradient established between donor and acceptor solutions creates a secondary sink state. This “double-sink” makes successful modeling of passive-diffusion transport of molecules possible. By accelerating transport of certain molecules, it shortens measurement time and increases assay throughput. A new permeability equation accounts for the “double-sink” condition as well as membrane retention.

PROBLEM TO BE SOLVED: To provide a method for subjecting works, such as, for example, various kinds of sheet materials, circuit boards, semiconductor wafers, glass substrates, ceramic substrates, metallic substrates, light emitting or light receiving element substrates for semiconductor lasers etc., MEMS substrates, semiconductor packages, cloth, leather, and paper, to working such as, for example, cutting and perforating. SOLUTION: The method of working the works by using UV absorption abrasion of a laser includes (1) a process of sticking a tacky adhesive sheet of ≥50% in transmittance in an absorption region of a laser beam to a surface of the work opposite to the surface to be irradiated with the laser, (2) a process of working the work by irradiating the work with the laser, and (3) a process of peeling off the tacky adhesive sheet.

The invention discloses an ultraviolet scanning multi-spectral water quality COD rapid detection method and its device. Embedded computer system connects to the single-chip system, and the single-chip system connects in turn to spectrum scanning stepper motor, measuring valve, cleaning valve, and the flow measurement groove respectively connects with automatic cleaning device, water sample export, cleaning valve, measuring valve, and cleaning valve connecting with washing water import, measuring valve connecting with water sample import, and ultraviolet light of deuterium lamp is gathered by measuring groove, and the ultraviolet light after water absorption is gathered to project to the plane grating spectrophotometry system, and after spectrophotometry, project to the photoelectric conversion circuit, the photoelectric conversion circuit connecting the single-chip system. The invention increases the applicability and the measurement accuracy of UV absorption based COD measuring instrument; it implements the fully automation of water extraction, measuring groove cleansing and measurement, and increases the on-line measurement speed, and cat fit in the online, fast and accurate analysis and test of the environmental water and various waste water COD.

The invention discloses a method for detecting amoxicillin residual quantity in milk and meat products. The method includes the following steps: preparing amoxicillin standard aqueous solution; adding a nonionic surfactant; reacting the obtained solution with quinone or alizarin to get a charge transfer system; determining the wavelength scanning range of fluorescence or ultraviolet; further calculating the linear range, working curve and other parameters of the standard solution; processing the sample to be detected by corresponding charge transfer reaction; determining reaction parameters under ultraviolet or fluorescence; and calculating to obtain the amoxicillin residue quantity. The technology further enhances the value of fluorescence intensity or UV absorption by utilizing the sensitizing effect of non-ionic surfactants, thus meets the low-residue testing requirement; simultaneously improves the system stability significantly, makes up the disadvantage of poor detection stability of fluorescence in the earlier application, and is more feasible in the actual detection.

A system and method for performing UV LED-based absorption detection for capillary liquid chromatography for detecting and quantifying compounds in a liquid, wherein a simplified system eliminates the need for a beam splitter and a reference cell by using a stable UV source, and power requirements are reduced, resulting in a portable and substantially smaller system with relatively low detection limits.

The invention discloses a detection method of nitrate and nitrite in blood, urine and tissue. In the weak acidic condition, nitrate ions and an ion pair reagent form an ion pair, and nitrite and a Griess reagent are reacted for a diazotization coupling reaction for forming an azo compound, thereby nitrate and nitrite which can not be retained on the chromatographic column without UV absorption can be analyzed by liquid chromatogram at different wavelengths, and mutual interferences are eliminated. The nitrate and nitrite detection in blood, urine and tissue which have large matrix interferences and low contents have larger applicability, and the detection limit of nitrate and nitrite are 0.2 mu g / mL and 0.05 mu g / mL respectively. The invention has the characteristics of simple operation, rapid determination, efficiency, accuracy, etc.

The present invention provides a separating agent for enantiomeric isomers having no large UV absorption as represented by an aromatic group and having high asymmetric recognizability, particularly, high asymmetric recognizability in an aqueous mobile phase, or a separating agent for enantiomeric isomers comprising a polysaccharide alicyclic ester derivative free from aromatic group as an effective component.

The invention provides a planting spongy substrate containing biomass activated carbon and a preparation method thereof.The planting spongy substrate containing biomass activated carbon can be formed freely and serves as a cavernous body planting base material containing biomass activated carbon.Plants or seeds can grow and develop by being directly placed into the substrate, fixation in the spongy substrate is achieved through a root system, soil or other substrates are not needed any more, and the plants can be suitable for various building structures after being planted.Biomass activated carbon serves as the main component of a soilless culture base material, so that the spongy substrate has the effects of adsorbing particles and purifying air.The product is low in weight, high in strength and good in air permeability and water-absorbing and water-retaining property, has the additional effects of insect prevention, bacterium prevention and ultraviolet absorption, and is particularly suitable for constructing small green landscape in various curve surface shapes in a room.

The invention discloses an UV-LED with a quantum dot EBL, comprising a sapphire substrate, an A1N nucleating layer, a non-doped u type A1GaN buffer layer, an n type A1GaN layer, an A1xGa1-xN / A1yGa1-yN quantum well active region, a p type A1N / A1GaN quantum dot EBL, a p type A1GaN layer and an ITO conductive layer. An n type ohmic electrode is lead out on the n type A1GaN layer, and a p type ohmic electrode is lead out on the ITO conductive layer. The UV-LED with a quantum dot EBL employs the p type doping layer of self-assembly A1N / A1GaN quantum dots as the EBL and a hole injection layer, which can effectively inhibit electrons from overflowing out of an active region, enhance the efficiency of hole injection to the active region, and thereby increase the carrier composite efficiency in the active region; in addition, A1N is used as the EBL to replace the A1GaN commonly used in blue LED, which can more effectively reduce UV absorption by the EBL, and increase UV-LED luminous efficiency.

A semiconductor growth system includes a chamber and a source of electromagnetic radiation. A detector is arranged to detect absorption of radiation from the source by a chloride- based chemical of the reaction chamber. A control system controls the operation of the chamber in response to the absorption of radiation by the chloride-based chemical. The control system controls the operation of the chamber by adjusting a parameter of the reaction chamber.

The invention discloses a UV detector with a non-polar absorption layer, which comprises the following elements arranged from the bottom to the top in a successive manner: a substrate, an AlN intermediate layer, an un-doped AlGaN buffer layer, an n-type AlGaN layer and a non-polar AlxGa1-xN / AlyGa1-yN multiple quantum well absorption and isolation layer, an un-doped ALzGa1-zN multiplier layer, p-type AlGaN layer, a p-type Ohmic electrode provided on the p-type AlGaN layer, an n-type Ohmic electrode arranged on the n-type AlGaN layer, where the AlxGa1-xN / AlyGa1-yN multiple quantum well is used as the absorption layer of the UV detector. The beneficial effects of the present invention are: to fundamentally prevent the polarized electric field in the absorption layer from compensating the built-in electric field in the p-n junction and to improve the photocurrent of the ultraviolet detector; in addition, the use of the non-polar AlxGa1-xN / AlyGa1-yN multiple quantum well as the absorption layer of the UV detector can further enhance the UV absorption coefficient and lateral carrier mobility of the UV detector due to the action of the quantum effect and plays an important role in raising the quantum efficiency and the sensitivity of the UV detector.

The application discloses a UV-visible absorption detection system based on a micro-fluidic chip and a detection method thereof. The UV-visible absorption detection system comprises a chip substrate, a micro-channel formed on the chip substrate and a UV absorption detector integrated on the chip substrate, wherein the micro-channel comprises a detection channel, and rays generated by the UV absorption detector are parallel to the extending direction of the detection channel. A light source of the UV absorption detector emits in and out in the horizontal direction of the chip, namely, in the direction parallel to the channel of the chip, so that the problem of short absorption optical path is solved; a UV-visible absorption detection operation unit is simple, low in detection cost and strong in university; the UV-visible absorption detector is integrated into the micro-fluidic chip, so that detection convenience is realized, and the quantity of the consumed solution can reach several or dozens of micro-liters. Compared with a traditional UV-visible absorption detection system, the detection method provided by the invention is greatly lowered in sample consumption, and has significance on detection of ions, micromolecules and the like in the field of environmental water or food.

In this study, pork-specific real-time PCR assay is developed for Halal authentication. Three species of meat samples are employed, which were pork, beef and chicken. These three type of poultry meat are among the commonly consumed meat in Malaysia and are easily available in the market. DNA from each raw meat sample was successfully extracted using DNeasy TM Blood & Tissue Kit (Qiagen,Hilden,Germany). Concentration of DNA extracted is estimated by UV absorption spectrophotometry using the Biophotometer (Eppendorf AG,Hamburg,Germany) prior to real-time PCR reaction. The annealing temperature for the primers is at 58 DEG C. To verify the specificity of primers designed, reaction is carried out to test the primers against the other two meat samples to detect possible cross-reactions. The reaction only amplified pork DNA at Ct+-22.83. The real-time PC assay described in this paper proved to be very sensitive with a low detection limit when samples were tested. The assay is done by preparing a 10-fold dilution series starting from 100 ng DNA were used to determine the sensitivity of the reaction. The sensitivity threshold was up to 0.001 ng pork DNA. It has been reported that a detection limit of 0.1 ng pork DNA using conventional PCR. In this context, the method would be useful in the detection of porcine DNA in food products.

The invention discloses a light extraction efficiency improving UV LED structure and a preparation method thereof. The structure comprises a substrate, an AlN buffer layer, a non-doped AlGaN buffer layer, an n-type AlGaN layer, an AlxGa1-xN / AlyGa1-yN multi-quantum-well active area, an Mg-doped P-type AlzGa1-zN electron blocking layer and a P-type ohmic contact layer, wherein a diamond film servesas the P-type ohmic contact layer. The preparation method includes steps: (1) sequentially growing the AlN buffer layer, the non-doped AlGaN buffer layer, the n-type AlGaN layer, the AlxGa1-xN / AlyGa1-yN multi-quantum-well active area and the AlzGa1-zN electron blocking layer to obtain an AlGaN based epitaxial wafer; (2) growing a B element doped diamond film in thickness of 3-200nm on the AlzGa1-zN electron blocking layer. By the structure with the diamond film serving as the ohmic contact layer, the problem of UV absorption of the contact layer is eliminated, and UV LED light extraction efficiency can be remarkably improved. In addition, the carrier concentration is effectively increased, so that the ohmic contact layer can be formed effectively, and the device operating voltage is lowered.

The invention discloses a quality control method of dual-wavelength overlaying and fusing fingerprints of pills of six ingredients with rehmannia. By combining the technology of fingerprints and the characteristic of components to be detected, utilizing the detecting method that absorption peaks produced by maximum uv-absorption wavelengths of different components overlay and fuse, the invention can eliminate interferences of the absorption peak produced by various wavelengths and ensure the accuracy and reliability of detected components. By the application of dual-wavelength overlaying and fusing, the quality control method correctly grasps the qualities of related medicines, thereby effectively ensuring the safety, unity, stability, efficiency and being controllable of pills of six ingredients with rehmannia. The quality control method of the invention is simple, correct in result and good in reproducibility, and can be applied to the quality evaluation of Chinese medicines, the quality control of Chinese medicines and the new medicine development of Chinese medicines, in particular to being used as one of the indexes of the quality control and true-and-false identification of pills of six ingredients with rehmannia.

A coating that can be adhered to a polyethylene gasoline container to substantially reduce its gas permeability, and a gasoline container treated with such a coating. A single-component cationic curing composition with increased impermeability to gasoline vapor uses a bis “F” epoxy in combination with a catalyst and oxetane. The invention takes advantage of a narrower ultraviolet absorption spectrum of the bis “F” epoxy, whereby ultraviolet radiation outside the UV absorption spectrum of the bis “F” will activate the catalyst, the highly active superacid from the antimonate anion, without any significant reduction of the cationic curing reaction. In the preferred embodiment the bis “F” and oxetane combination is used along with various additives included for flow and cosmetic purposes.

A preparation method for an anti-ultraviolet heatproof BOPET film relates to a preparation method for a BOPET film, and mainly aims at solving the problems that conventional BOPET films are bad in anti-ultraviolet performance and heatproofness. The preparation method comprises: 1, preparing a sericite solution; 2, preparing a titanium dioxide / sericite solution which is a coating liquid; and 3, immersing BOPET films in the coating liquid for coating by employing a doctor-blade method, drying and rolling. According to the preparation method for the anti-ultraviolet heatproof BOPET film, the employed raw materials are conventional reagents in the field, and have low commercial price; and compared with untreated BOPET films, the prepared anti-ultraviolet heatproof BOPET film is improved in softening point temperature by 20% and obviously reinforced in UV absorption characteristic peak of the film surface after treated by placing in a UV ageing oven under the conditions of 100 DEG for 1 h. The preparation method is simple in technology, does not pollute environment, and is applicable to industrialized production.

The invention discloses an adhesive film with different UV absorption wavebands and a preparation method thereof. The adhesive film with different UV absorption wavebands is prepared from the following components in parts by weight: 100 parts of matrix resin, 0.1 to 2 parts of peroxide cross-linking agent, 0.1 to 2 parts of assistant cross-linking agent, 0.05 to 2 parts of UV absorption aid, 0.05 to 2 parts of UV light conversion agent, 0.1 to 2 parts of silane coupling agent, 0 to 1 part of light stabilizer and 0 to 1 part of antioxidant. The adhesive film with different UV absorption wavebands can selectively block UV light wavebands, block wavebands damaging a battery piece and keep non-destructive wavebands to pass through, so that the power of a battery piece assembly is improved.