153 results about "Uv spectra" patented technology

Monodisperse colloidal nanocrystal clusters of magnetite (Fe3O4) with tunable sizes from about thirty to about three hundred nanometers have been synthesized using a high-temperature hydrolysis process. The colloidal nanocrystal clusters are capped with polyelectrolytes, and highly water soluble. Each cluster is composed of many single magnetite crystallites, thus retaining the superparamagnetic behavior at room temperature. The combination of superparamagnetic property, high magnetization, and high water dispersibility makes the colloidal nanocrystal clusters ideal candidates for various important biomedical applications such as drug delivery and bioseparation. The present invention is further directed to methods for forming colloidal photonic crystals from both aqueous and nonaqueous solutions of the superparamagnetic colloidal nanocrystal clusters with an external magnetic field applied thereto. The diffraction of the photonic crystals can be tuned from near infrared to visible and further ultraviolet spectral region by varying the external magnetic field.

An inorganic, dielectric grid polarizer device includes a stack of film layers disposed over a substrate. Each film layer is formed of a material that is both inorganic and dielectric. Adjacent film layers each have different refractive indices. At least one of the film layers is discontinuous to form a form-birefringent layer with an array of parallel ribs having a period less than 400 nm. Another layer, different than the form-birefringent layer, is formed of an optically absorptive material for the ultra-violet spectrum.

The invention discloses a method for detecting aflatoxin through an immunosensor. The aflatoxin (AFT) is a fungal toxin which has the high carcinogenicity, teratogenicity and toxicity, and accurate and rapid analysis on the aflatoxin is one of most effective means for reducing and avoiding harm of the aflatoxin. A prepared gold-polyaniline-graphene (Au-PANI-GN) composite nanomaterial is represented by adopting an ultraviolet spectrum and a transmission electron microscope and used for constructing the electrochemical immunosensor, the electrochemical immunosensor is represented by adopting a cyclic voltammetry method, an electrochemical AC impedance method and a square wave voltammetry method, and the prepared electrochemical immunosensor detects the aflatorxin B1. Experiment results show that the constructed electrochemical immunosensor has the good electrochemical activity on detection of the aflatoxin, and the concentrations of the aflatoxin and peak currents have the good linear relation, wherein the linear equation of the relation is y=-0.177x+4.28.

An optically pumped, in particular diode-pumped, continuous solid-state laser produces a primary laser beam whose frequency is converted into the visible or ultraviolet spectral range by means of one or more downstream passive resonators with non-linear crystals. At relatively low cost and complication it is provided that precisely two longitudinal laser modes of approximately equal amplitude are excited in the laser resonator. That achieves a high level of efficiency for the overall system and a very low noise level of the resulting frequency-converted laser beam. In one embodiment of the invention the frequency-converted radiation contains three or more adjacent frequencies. In another embodiment of the invention the frequency-converted laser radiation contains only one single frequency and therefore corresponds to the radiation of a monomode laser.

In the basic Diode-Pumped Alkali Laser (DPAL) device, excitation to the n .sup.2P.sub.3 / 2 electronic level by a single diode laser pump source leads to a population inversion between the first excited electronic .sup.2P.sub.1 / 2 level and the ground .sup.2S.sub.1 / 2 level, permitting the construction of efficient, high-power, compact DPAL laser oscillators in the near infrared spectral region. The present invention extends the single-step excitation DPAL to a two-step excitation, or up-conversion DPAL to produce efficient, powerful laser operation in the visible blue and near UV spectral regions (viz., in the range 460-323 nm). The present invention describes an apparatus and method that efficiently sums the energy of two, near-infrared diode pump photons in alkali vapor atoms, followed by stimulated emission to their electronic ground levels.

The invention provides a comprehensive flame detection method based on ultraviolet and video. The method comprises the following steps: S1, carrying out real-time detection on a monitoring environmentthrough an ultraviolet and binocular vision composite flame detector, firstly, detecting a flame ultraviolet spectrum through an ultraviolet sensor, and triggering a video camera to carry out snapshot under an abnormal condition, so as to obtain current environment image data; S2, performing image analysis on the obtained video image data, and using motion detection to segment a suspected flame region image based on region growth in combination with an HSI color model; judging the suspected flame region through flame characteristic detection; according to camera parameters, carrying out binocular vision reconstruction to obtain the actual flame area and distance; and S3, judging the flame grade of the flame at the current moment and in the whole combustion process according to the actualarea of the flame.

The present disclosure relates to signal processing such as digital watermarking and other encoded signals. One claim recites a method of offsetting color casting for a printed object associated with a retail product. The method includes: providing a first additive that absorbs light energy at or around a center wavelength of an illumination source; providing a second additive that absorbs in the ultra-violet spectrum, yet fluoresces at or around the center wavelength of the illumination source, wherein a combination of spectral responses of the first additive and the second additive offset color casting; printing the first additive, second additive and a color on the printed object, wherein the printing conveys an encoded plural bit signal. Of course, other claims and combinations are provided in the specification with reference to specific implementations and related examples.

Device for measuring the position of a structure on an object 30 with at least one laser interferometer system 29 to determine a positional displacement of the object 30 in at least one spatial direction, whereby the object is placed on a stage which is translatable in the X and Y coordinate direction An illumination device is provided, which illuminates the structures to be measured. The structure is imaged on a detector 34 via a high-resolution microscope optics in incident light and / or transmitted light in the near UV spectral range. The illumination device is an excimer laser, a frequency multiplied solid-state or gas laser, or an excimer lamp.

The invention discloses a catalyst carrier and application thereof. The catalyst carrier comprises metallic oxide and doped graphene, wherein the metallic oxide is a ceramic nano semiconductor material such as fiber-like alpha-Fe2O3, TiO2 or Al2O3. The catalyst carrier disclosed by the invention is simple and effective, and by using the catalyst carrier, the active locus of a metal catalyst can be improved by using a photocatalysis method. The ultraviolet spectrum testing shows that compared with a catalyst which is not radiated with light, the catalyst which is radiated with light is remarkably improved in catalytic activity.

The invention provides a method for the rapid determination of tannin content in a Slvia Miltiorrhiza Bunge extracting solution, comprising the following steps: firstly, collecting Slvia Miltiorrhiza Bunge extracting solutions with different decocting times and different extract processes as calibration set samples; and then utilizing a phosphomolybdium tungstic acid / casein method to measure the tannin content, and taking the measuring result as a reference value; simultaneously, adopting an ultraviolet spectrophotometer to measure the spectroscopic data of the diluents of the calibration set samples within the range of 200-480nm; applying the stoichiometry technology to build a quantitative calibration model for the ultraviolet spectrum of the Slvia Miltiorrhiza Bunge extracting solution and the tannin content thereof; meauring the ultraviolet spectrum data of the Slvia Miltiorrhiza Bunge extracting solution sample the tannin content of which is unknown according to the same method; and utilizing the established quantitative calibration model to rapidly figure out the content value of the tannin. The method of the invention has the characteristics of simple instruments, simple and convenient operation and rapid measurement speed, saves a great amount of labor power and material resources, can be used in rapid measurement of the tannin content during the process of producing Slvia Miltiorrhiza Bunge injecta.

An ultra-broadband ultraviolet (UV) catadioptric imaging microscope system with wide-range zoom capability. The microscope system, which comprises a catadioptric lens group and a zooming tube lens group, has high optical resolution in the deep UV wavelengths, continuously adjustable magnification, and a high numerical aperture. The system integrates microscope modules such as objectives, tube lenses and zoom optics to reduce the number of components, and to simplify the system manufacturing process. The preferred embodiment offers excellent image quality across a very broad deep ultraviolet spectral range, combined with an all-refractive zooming tube lens. The zooming tube lens is modified to compensate for higher-order chromatic aberrations that would normally limit performance.

The invention discloses paraquat hapten, paraquat complete antigen and a preparation method of the paraquat hapten and the paraquat complete antigen. Midbody 4,4-bipyridine of paraquat is utilized to combined analogue N-methyl-N'-valeric acid group-bipyridine-bibromide, carrier protein bovine serum albumin (BSA) is coupled through a mixed anhydride method, and paraquat artificial complete antigen can be successfully combined after ultraviolet spectrum identification and sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) identification. The preparation method is simple and effective and low in cost. The combined paraquat artificial complete antigen can be applied to preparing peculiarly identifying efficient antibody of chemical pesticide paraquat and developing immune quick test kits remained by quick detection of paraquat to provide convenient methods for detection research of the materials.

The invention provides an online rapid detection method of a herba andrographis concentrated decolorization process. An online UV detection device is installed, a concentrated solution sample and a corresponding online UV spectrum are collected, the content of a quality control index in a sample solution is detected by using a high performance liquid chromatography and a partial least squares method is used for establishing a quantitative calibration model and the test is implemented. The model established by the invention has good calibration and prediction abilities, and has the advantages that the contents of andrographolide and dehydroandrographolide in the herba andrographis extract concentrated decolorization process can be detected more quickly and accurately compared with the traditional analysis method; the detection method is favorable for improving the quality control level of traditional Chinese medicine products in the production process, and the stability and the reliability of product quality are ensured.

A scintillation based imaging system. The device utilizes a single-crystal inorganic scintillator to convert ionizing radiation to light in a spectral range or ranges within the visible or ultraviolet spectral ranges. The conversion takes place inside the single crystal material, preserving special resolution. The single crystal scintillator is sandwiched between a first plate that is substantially transparent to the ionization radiation and a second plate that is transparent to the visible or ultraviolet light. The ionization radiation is directed from the submicron source through a target to create a shadow image of the target inside the scintillator crystal. Several submicron sources of radiation are described. These include submicron x-ray and high-energy ultraviolet sources, submicron electron beam sources, submicron alpha particle sources, submicron proton sources, submicron positron sources and sub-micron neutron sources. Also, Applicants describe submicron spot size x-ray sources produced using electron beams alpha particles, protons and positrons. In preferred embodiments larger size sources are converted to submicron sources by focusing the radiation to a submicron neck, by blocking all but a submicron portion using a pinhole arrangement or by channeling the radiation with a pinhole funnel.

The invention relates to the field of soil analysis, in particular the technical analysis of agricultural or horticultural soils. In particular, the invention relates to a sensor device for in situ soil analysis, to a method for in situ soil analysis, and to a device set up for carrying out the soil analysis method, wherein said device, together and in interaction with one or more of said sensor devices, represents a system for in situ soil analysis. The sensor device has a sensor assembly comprising one or more sensors which are configured individually or cumulatively for the simultaneous in situ measurement of at least two of the following soil properties of a soil to be analyzed and for providing corresponding to respective measurement data: (a) impedance spectrum, (b) temperature, (c) absorption spectrum NIR-VIS-UV in a spectral range from NIR (near infrared spectral range) to UV (ultraviolet spectral range), and (d) acidic or basic character, in particular pH value. In this case, the distance between in each case two of the sensors of the sensor assembly, which is defined with respect to the respective measurement variable sensors, does not exceed a value of 10 cm.

The invention relates to a method for measuring index component content in a Qingkailing injection midbody and a finish product. The invention is characterized in that each index component content is measured by adopting the high performance liquid chromatography or other analysis methods; the diluted sample is scanned in full wavelength by adopting the ultraviolet spectrophotometric method; the sample is divided into two parts: a corrected collection and a verified collection. According to the ultraviolet spectroscopic data and the content of the corrected collection, the data are processed by adopting the chemometrics method; a mathematical model is established by utilizing a TQ Analyst software and a Matlab 6.5 software; the ultraviolet spectroscopic data of the verified collection sample is substituted into the mathematical model; a predicted value and a true value are compared, and the precision and the reliability of the technology are verified. The method of the invention can be used for content measurement of chlorogenic acid and baicalin in the silver yellow liquid, and the content measurement of Caryptoside and total nitrogen in the four-miscible liquid. The invention also can be used for the fast online detection of component content hereinbefore, and can be used for the content measurement and fast online detection of the Qingkailing injection midbody and the finish product.

The invention discloses an aluminum ion fluorescent probe and a preparation method thereof. The method comprises the following steps: synthesizing 7-hydroxycoumarin-8-aldehyde by taking hexamethylenetetramine, 7-hydroxycoumarin and glacial acetic acid, and synthesizing the aluminum ion fluorescent probe by utilizing 7-hydroxycoumarin-8-aldehyde and ortho-aminophenol. The structure of the aluminumion fluorescent probe is represented by a nuclear magnetic spectrum and a mass spectrum; the spectral quality of the fluorescent probe is analyzed through an ultraviolet spectrum and a fluorescent spectrum; the result indicates that the fluorescent probe has high selectivity and is not interfered by other co-existing ions when identifying aluminum ions; and the probe generates coordination interaction with the aluminum ions according to the ratio of 1:1 and the reaction has reversibility. Therefore, the fluorescent probe can be applied to detection on the aluminum ions well.

The invention discloses a method for detecting quality of fried edible oil through an ultraviolet spectrophotometer and belongs to the technical field of fried edible oil detection. The method is characterized by comprising the following steps: dropwise adding unused edible oil and fried edible oil into a quartz cuvette with the thickness of 1 cm respectively, putting the quartz cuvette into the ultraviolet spectrophotometer for spectrum detection, extracting spectrum curves Q1 and Q2, and adopting the following formula (shown in the description) to calculate the similarity S of the spectrum curves Q1 and Q2, wherein n refers to the number of sampling points, y1j and y2j refer to the absorption values of the spectrum curves Q1 and Q2 at the jth sampling points. According to the invention, the ultraviolet spectrophotometer is adopted to research the influence of different heating temperatures and heating durations on quality of soybean oil, the ultraviolet spectrum characteristic curve comparison diagrams are established, and a judgment standard whether the fried edible oil can be continuously used or not is given.

Methods of precisely analyzing and modeling band gap energies and electrical properties of a thin film are provided. One method includes: obtaining a substrate and a thin film disposed above the substrate, the thin film including an interfacial layer above the substrate, and a high-k layer above the interfacial layer; determining a thickness of the thin film; analyzing the thin film using deep ultraviolet spectroscopy ellipsometry to determine the photon energy of reflected light; using a model to determine a set of bandgap energies extracted from a set of results of the photon energy of the analyzing step; and determining at least one of: a leakage current from a main bandgap energy, a nitrogen content from a sub bandgap energy, and an equivalent oxide thickness from the nitrogen content and a composition of the interfacial layer.

The invention pertains to the medical technology, in particular to an anti-tumor compound of incarvillea delavayi base A. The compound is a new alkaloid compound, which is extracted from the Chinese herbal medicine incarvillea delavayi. The precise mass number of the compound is 278.1546 (M plus H) <plus>, the molecular formula is C19H19NO by calculation; and the ultraviolet spectrum has strong absorption at 273nm and 249nm. Experiments show that the compound has good activity for inhibiting various tumor cells and can be used for the preparation of anti-tumor drugs.

The invention belongs to the spectrum instrument technology field and is the facture of mini ultraviolet spectrum radiator of upper air balloon experiment: connect the photic components of the photic system to the framework and fix them with the shell; the wavelength revolving lead-screw, the nut and the sway bar can scan in 180nm-400nm range; the linear expansion coefficients of the raster framework, the nut, the sway bar, the lead-screw and the shell are matched; the silica gel seals the space between the detector and the detector shell and in the high-pressure source. The invention solves the problem of the traditional device, can bear the low temperature condition and ensure the wavelength precision.

The invention discloses an AlGaN / SiC double-color ultraviolet detector. The detector comprises an N-type SiC substrate layer, an N-type heavily-doped SiC ohmic layer, an unintentionally-doped SiC absorption layer, a P-type SiC ohmic contact layer, an unintentionally-doped AlGaN absorption layer, an ohmic contact back electrode, a semitransparent Schottky electrode, a first contact electrode, a second contact electrode and a transparent medium passivation layer. The advantages of an AlGaN material system and an SiC material system are combined. The detector is based on low lattice defects of aSiC material, high visible light blind ultraviolet responsivity and small lattice mismatch and thermal mismatch with an AlGaN material, and the AlGaN layer is adopted as an absorption layer for solarblind detection and a filtering layer for visible light blind detection, thereby achieving the detection of two wavebands of one device, and greatly improving the resolution capability of the detectorfor a target object. The detector has the characteristics that the structure is simple, the manufacturing process is compatible with the current LED process, the detection wave band is variable, andthe ultraviolet spectrum analysis is facilitated.

The invention relates to a method for measuring perfluorooctane sulfonate by using dual-wavelength ratio ultraviolet spectroscopy, and belongs to the field of physical and chemical inspection research. Perfluorooctane sulfonate molecules do not have ultraviolet absorption functional groups and do not have ultraviolet absorption properties. In the method provided by the invention, the ultraviolet absorption generates electrostatic interaction with toluidine blue under acidic conditions to form an ionic associate, the ionic associate shows two characteristic peaks at 632 nm and 502 nm and performs rational absorption, the concentration of a perfluorooctane sulfonate solution has a good linear relationship with an ultraviolet dual-wavelength absorption ratio value under selected conditions, and the dual-wavelength ratio ultraviolet spectroscopy for measuring the perfluorooctane sulfonate is established accordingly. The method provided by the invention is suitable for measuring the perfluorooctane sulfonate in environmental water samples, and has the advantages of simple and convenient operation, high sensitivity, strong anti-interference ability and the like.

The invention relates to a method for monitoring air particles and air abnormal components in a switch cabinet. The method is characterized in that utilizing an infrared light scattering dust fall monitoring device adopting a particle calculation principle to monitor the concentration of dust particles, judging whether the alarm concentration is reached or not, if the alarm concentration is not reached, continuing to monitor, otherwise, monitoring the concentration of O3 by adopting an ultraviolet spectrum gas absorption principle, monitoring the concentrations of NO, CO and NO2 by adopting anelectrochemical principle, judging whether the alarm concentration is reached or not, if the alarm concentration is not reached, performing ventilation and dust removal, otherwise, sending out a prompt that the suspected partial discharge defect exists. The method is advantaged in that design is reasonable, monitoring of the internal operation environment of the switch cabinet is enhanced by monitoring abnormality of air particles and air components in the switch cabinet, the effective equipment operation condition information is provided for operation maintenance and state overhaul, and insulation flashover and insulation breakdown conditions are avoided.

The invention belongs to the field of fluorescent probes for chemical analysis, and relates to a compounding method and application of a novel long-wavelength fluorescent probe for double-channel detection of hydrogen sulfide. The compounding method includes that a target probe compound is obtained from aldol reaction between a rhodamine-like derivative and aldehyde coumarin with the presence of a basic catalyst. The preparation method of the probe is simple, stability is high, the background fluorescence is weak, the probe can response to the hydrogen sulfide selectively and sensitively, the ultraviolet spectrum has a ratio-type change and is accompanied by about 130 nanometers of red shift, double-channel reinforcement of the fluorescence spectrum occurs in 662nm and 818nm, injuries to living organisms are small, and accordingly, the probe has a good application prospect in the fields such as biological imaging.

The present invention discloses a synthesis method for atrazine (AT) artificial complete antigen, and belongs to the technical field of biochemical engineering. According to the present invention, the structure of the AT is subjected to carboxylation transformation; DCC and NHS are adopted to conjugate the carboxylated AT to a carrier protein BSA; the AT artificial complete antigen is successfully synthesized by ultraviolet spectrum identification and SDS-PAGE identification. With the present invention, the preparation method is simple and effective; the cost is low; the synthesized AT artificial complete antigen can be used for preparing the efficient antibody and developing the rapid immune test kit, and provides a convenient approach for the future detection and research of the AT, wherein the efficient antibody can specially recognize the chemical pesticide AT, the rapid immune test kit can rapidly detect the AT residue.

The invention discloses a fluorescein-rhodamine B copper ion ultraviolet molecular probe applied to naked eye detection and synthesizing and using methods thereof, relates to a Cu<2+> probe and synthesis and application thereof and aims at solving the technical problems that an existing Cu<2+> molecular probe needs to use an expensive-price high-precision fluorescence spectrophotometer for detection and is prone to being interfered by external environment. A structural formula of the molecular probe disclosed by the invention is shown in a following description. According to a preparation method of the molecular probe, the molecular probe is prepared by the steps of utilizing fluorescein mono-aldehyde and rhodamine B hydrazine to react and utilizing a mixed solvent of methylene dichlorideand methyl alcohol to separate through a column chromatography. A use method of the molecular probe comprises the steps of dissolving the probe in a mixed solution of MeOH and HEPES buffer solution, detecting an added sample to be detected and judging that Cu<2+> is contained if color of the solution is changed into deep pink from light pink; or detecting ultraviolet spectrum absorbance values before and after the sample is added and judging that the sample solution contains the Cu<2+> if the absorbance value is improved when the wavelength is 502 and 553nm. A detection method is simple, quickand visual.

The invention belongs to the technical field of smokeless tobacco product test, and specifically relates to a method for detecting a nicotine release behavior of snus, and a special test instrument thereof. Structural transformation is performed on an existing medicine dissolution rate instrument according to the consumption characteristics of bagged snus for adapting to snus test, a in vitro detection method capable of simulating the release behavior of the nicotine of the snus in the oral cavity is provided, and a in vitro simulation test is performed on the nicotine release behavior of thebagged snus in combination with the optical fiber conduction technology, the ultraviolet spectrum analysis technology and the computer data processing technology. The maximum advantages of the methodare that in vitro continuous analysis, real-time analysis and online analysis of the nicotine release behavior of the snus is realized, the repeatability is good, the degree of automation is high, andimportant technical support and scientific evidence are provided for the product design, quality control, risk assessment and policy development of the snus products.

The invention discloses a preparation method of L-phenylalanine print hydrogel based on zwitter-ion monomer. The preparation method comprises the following specific steps: performing alkylation reaction between 1-vinyl imidazole and 1,3-propane sultone to prepare the zwitter-ion monomer VSPIM; using L-phenylalanine as a template molecule, the prepared VSPIM as a functional monomer, N,N-methylene bisacrylamide as a cross-linking agent and water as a solvent, triggering polymerization through redox reaction and obtaining hydrogel; washing the obtained hydrogel in NaCl solution, measuring a characteristic peak of eluant at 259nm position through an ultraviolet spectrophotometer, continuing an eluting process until the characteristic peak in an ultraviolet spectrum of the eluant at the 259nm position cannot be observed and then eluting NaCl on the surface of hydrogel with deionized water to obtain the print hydrogel. The preparation method disclosed by the invention utilizes zwitter-ion radicals to reduce a nonspecific adsorption effect of print hydrogel on protein.

The invention provides a coumarin derivative (2-((1E,3Z)-4-chloro-4-(6-(diethylamino)-2-oxo-2H-chromen-3-yl)buta-1,3-dien-1-yl)-3-methylbenzo[d]thiazol-3-ium), a preparation method and an application of the coumarin derivative, and a bisulfite detection kit. The coumarin derivative can be used to detect the concentration of a bisulfite ion in a sample by using an ultraviolet spectroscopy or fluorescent spectrometry. The invention prepares the novel coumarin derivative, the compound can serve as a detection reagent of the bisulfite ion and shows quite high sensitivity and selectivity for the bisulfite ion, the detection result is not affected by other metal ions and is accurate, the detection process is convenient, sensitive and fast, the limit of detection is relatively low, the linear range is relatively wide, and the detection method is simple, low in cost, and easy to realize, and has a broad range of application.