174 results about "Uv absorption" patented technology

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 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.

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. COPYRIGHT: (C)2005,JPO&NCIPI

A laser processing protection sheet (2) capable of effectively preventing contamination on the surface of an article to be processed by decomposition products when the article to be processed (1) is processed by the UV absorption ablation of a laser beam (7). A production method for a laser processed article (10) using the laser processing protection sheet (2). The laser processing protection sheet (2) is provided on the laser beam incident surface side of the article to be processed (1) when the article (1) is processed by the UV absorption ablation of the laser beam (7).

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.

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.

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.