80 results about "Uv vis absorbance" patented technology

The invention relates to the technical field of water pollution detection, in particular to a water quality pollution multi-dimensional analysis system which comprises the following steps: synchronously measuring an ultraviolet-visible absorption spectrum of a water sample to be detected and scattered light intensity in an orthogonal direction, and deducting spectrum baseline interference caused by suspended particulate matters in the water sample through a correction algorithm; the interferents in the water sample are selectively converted and degraded by applying a programmed potential to the inflowing water sample to be detected; the reverse pulse is periodically applied, so that the online regeneration function of the electrode is realized; analyzing the spectral data by adopting a multivariate correction algorithm, and calculating the concentration of the target pollutant; the calculation residual error of the multivariate correction algorithm is analyzed, new interference and system performance drift of current measurement are diagnosed, and a corresponding system state code is generated; and responding to the system state code, automatically starting and carrying out state checking and multi-point calibration on the instrument, and using a calibration result to update the analysis model. Through multi-dimensional perception and closed-loop operation, accuracy and reliability of water quality monitoring are guaranteed.

The invention provides a method for analyzing femtosecond laser-induced damage behaviors on the surface of a Zn-doped KDP crystal, and belongs to the technical field of engineering optics based on computer data processing. The method comprises the following steps: firstly, respectively analyzing the influence of the Zn doping amount on the band gap and electroacoustic coupling of the KDP crystal through an ultraviolet-visible absorption spectrum and a Brillouin light scattering spectrum; then constructing a one-dimensional model, respectively simulating the electron density, lattice temperature and time evolution of electron temperature on the surface of the Zn-doped KDP crystal under femtosecond laser irradiation through an electron density accumulation rate equation and a double-temperature model, and theoretically analyzing the influence of the Zn doping amount on the damage behavior of the surface of the KDP crystal. And a theoretical model for calculating the femtosecond laser induced damage threshold is established, so that the optimal doping amount of Zn is determined in a lossless manner. A real sample is not contacted, so that the sample utilization rate is improved; the simulation process is more stable and controllable, and the data repeatability is high; and the research period can be shortened, and optimal doping amount screening is accelerated.

The invention provides a peptide fragment for modifying a Fe3O4 (at) Au magnetic nanoparticle and a preparation method of the Fe3O4 (at) Au magnetic nanoparticle, the peptide fragment is an alpha-peptide fragment 1 or / and a beta-peptide fragment 1, and the fragment of the peptide fragment is as shown in SEQ ID NO: 1. The method comprises the following steps: firstly, growing a layer of gold shell on the surface of Fe3O4 in situ to provide more modification sites, and then modifying PS binding peptide (PSBP) by using an Au-S bond to construct the PS NPs selective probe. The ultralow-concentration PS can be quantitatively detected only by monitoring the ultraviolet-visible absorption change of the probe. The peptide modified Fe3O4 (at) Au probe (Fe3O4 (at) Au-PSBP) has good linearity in a range of 0 to 80 pg mL <-1 >. The probe has been successfully applied to actual samples, such as bottled water, edible salt and milk. The adding standard recovery rate is 98.85%-112.10%, and the relative standard deviation (RSD) is 2.53%-13.80%. The provided Fe3O4 (at) Au-PSBP can be easily expanded to other types of NPs by simply replacing peptides, shows huge potential as a universal specific probe, and can sensitively and quickly detect low-concentration NPs in an actual sample.

The invention provides an electrolyte treatment system, and relates to the technical field of electrolyte treatment. The electrolyte treatment system comprises a carrier, the carrier is used for carrying a device, a to-be-detected sample tank, a powder storage tank and a liquid storage tank, the powder storage tank is used for storing solid raw materials, the liquid storage tank is used for storing liquid raw materials, and the to-be-detected sample tank is used for storing to-be-detected electrolyte; the carrier, the preparation device and the detection device are arranged around the transfer device in a surrounding manner; wherein the transfer device is configured to be capable of conveying the appliance and the powder storage tank to the preparation device, the solid raw materials in the powder storage tank are injected into the appliance in the preparation device, and the transfer device can be used for injecting the liquid raw materials in the liquid storage tank into the appliance so as to prepare the electrolyte to be detected; the transfer device is configured to be capable of conveying a to-be-detected sample tank or appliance to the detection device, and the detection device can detect at least one of the conductivity, solvation energy and ultraviolet-visible absorption spectrum of the to-be-detected electrolyte.

An input end and an output end of a first transmission optical fiber are respectively communicated with an output end of a light source and an input end of a light filtering assembly, and an input end and an output end of a second transmission optical fiber are respectively communicated with an output end of the light filtering assembly and an input end of a spectrograph. The output end of the light filtering assembly is electrically connected with the input end of the spectrograph, and excitation light emission signals can be filtered. The in-situ spectrum testing system is suitable for fluorescence testing and ultraviolet-visible absorption spectrum testing scenes. Wherein the first transmission optical fiber and the second transmission optical fiber are respectively used for optical signal transmission of the light source and optical signal input and output of the light filtering assembly. The light filtering assembly is arranged between the light source and the spectrograph, the photon number of the light source signal can be effectively filtered, and it is guaranteed that a sample with a weak fluorescence signal can be tested while the power of the light source is increased.

The invention belongs to the technical field of biochemical detection, and particularly relates to a bionic microsphere, a non-diagnostic-purpose extracellular vesicle detection method and an extracellular vesicle detection kit, the bionic microsphere is prepared by modifying a homologous cell membrane CM on the surface of a silica microsphere MS; the bionic microsphere (CMS) is used for capturing specific types of extracellular vesicles (EVs) in a to-be-detected sample and an optical / electrochemical detection method, can specifically capture homologous EVs, and is combined with fluorescence, ultraviolet visible absorption, differential pulse voltammetry and electrochemical luminescence for detection.

The invention discloses a spectrum method water quality on-line monitoring method, system and device based on edge calculation, a medium and a product, and relates to the field of water quality monitoring, the method comprises the following steps: training a one-dimensional convolutional neural network model according to a spectrum data set and a corresponding water quality parameter label, and generating a lightweight AI reasoning model adapted to an edge device; the spectral data set comprises an ultraviolet-visible absorption spectrum of the water body; the edge device comprises a microcontroller, an ultraviolet-visible full spectrum sensor and a LoRa communication unit; burning a weight file of the lightweight AI inference model to the microcontroller, and locally analyzing water quality parameters in real time according to the lightweight AI inference model to determine a water quality monitoring result; the water quality monitoring result is uploaded to a cloud management platform through the LoRa communication unit, so that visual monitoring is achieved, the monitoring precision is ensured, meanwhile, the data transmission amount is greatly reduced, and then real-time monitoring in a low-power-consumption environment is achieved.

The invention belongs to the field of soil dissolved organic matter analysis, and provides a multispectral-based DOM detection and reclamation influence evaluation method, which comprises the following steps: step 1, collecting dry farmland soil samples of different reclamation years, and obtaining soil column samples of a plough layer, a plow pan and subsoil; 2, extracting, centrifuging and filtering the soil sample to obtain a DOM solution; 3, detecting the DOM solution by adopting an ultraviolet-visible absorption spectrum; step 4, adopting a three-dimensional fluorescence spectrum and combining parallel factor analysis to obtain fluorescence components and source characteristics of the DOM solution; step 5, analyzing molecular composition and characteristic parameters of the DOM solution by adopting solid-phase extraction in combination with Fourier transform ion cyclotron resonance mass spectrometry; and step 6, based on the detection data in the steps 3-5, evaluating the influence of reclamation years on the composition, structure and degradation characteristics of the DOM. According to the method, multi-dimensional detection of soil DOM is realized through a multi-spectrum and mass spectrum combined technology, and DOM is comprehensively analyzed from a macrostructure to molecular composition.

A 2-amino-5-substituted-1,3,4-oxadiazole is used to identify Cr(VI). A test solution is prepared using the 2-amino-5-substituted-1,3,4-oxadiazole. An anionic solution is added to the test solution, and Cr(VI) is identified by naked-eye observation and UV-visible absorption spectroscopy. The method demonstrates excellent selectivity for Cr(VI) identification, with no interference from other ions, enabling better detection of Cr(VI) in the environment.

An inkjet ink contains a quinacridone pigment, a resin, and an aqueous medium. A 50-fold dilution of a supernatant obtained by centrifugating the inkjet ink at 1,050,000 G for 3 hours has a phosphorous concentration of at least 1.0 ppm and no greater than 6.0 ppm. On an ultraviolet-visible absorption spectrum of the supernatant, a first peak appears at a first absorbance of at least 0.16 and no greater than 0.40. The first peak is a maximum peak in a wavelength range of the ultraviolet-visible absorption spectrum of at least 300 nm and no greater than 340 nm. On the ultraviolet-visible absorption spectrum of the supernatant, a second peak appears at a second absorbance of at least 0.15 and no greater than 0.80. The second peak is a maximum peak in a wavelength range of the ultraviolet-visible absorption spectrum of at least 400 nm and no greater than 490 nm.

Ultraviolet (UV) absorbing inks and films for surfaces such as glass and / or plastic are provided that include patterns visible to avian eyes, but invisible to a human at least ten feet away. Such invention is aimed at reducing the number of window strikes that result in bird deaths. A formulation may include a binder, a carrier. A formulation may include a base configured to dissolve and solubilize the binder such that it can be applied to the carrier. A formulation may include at least one of an ultraviolet (UV) / visible (VIS) absorbing (UAC) component and a UV / VIS reflective (URC) component.

A system for the synthesis of zinc oxide, iron oxide and manganese oxide nanoparticles by means of green synthesis using pea shell biomass extract as a reducing agent, wherein the nanoparticles have sizes in the range of 40-120 nm, which were confirmed by UV-Vis absorption, FTIR and FESEM.

This invention discloses a rapid monitoring method for comprehensive spectral ecological parameters of seawater based on a cross-neural network. The method includes: receiving the UV-Vis absorption spectrum and three-dimensional fluorescence spectrum of a standard solution sample as initial spectral data; preprocessing the initial spectral data to obtain a comprehensive spectral dataset; establishing a cross-neural network model, inputting the comprehensive spectral dataset into the model, and outputting predicted values ​​of multiple seawater ecological parameter components by fusing spectral feature matrices and cross-referencing information from the UV-Vis absorption spectrum and three-dimensional fluorescence spectrum, and adjusting the network weights by comparing these predicted values ​​with the actual values; stopping training once the model accuracy meets the target, fixing the network weights, and then inputting the preprocessed spectral data of the seawater sample to be tested into the trained cross-neural network model to output the content of the ecological parameter components. This method can simultaneously measure multiple ecological parameters, improving monitoring efficiency and accuracy, and providing a key technology for the development of multi-parameter sensors for seawater quality.

The present invention provides a dry film that reduces color unevenness in a display when a light-emitting element is lit, a light-emitting electronic component using the film, and a method for manufacturing the same. [Solution] A dry film 1a for pressing onto the surface on which a plurality of light-emitting elements 21 to 23 are arranged on a substrate 20, comprising at least a black curable resin layer 10 for shielding light between the plurality of light-emitting elements, wherein a specific relationship holds between the average absorbance between wavelengths of 430 to 480 nm, the average absorbance between wavelengths of 500 to 550 nm, and the average absorbance between wavelengths of 600 to 650 nm of the ultraviolet-visible absorption spectrum obtained by measuring the black resin layer after curing the black curable resin layer.

Described herein are systems and methods that obtain dynamic light scattering data from a plurality of particle samples, and in some instances, also measure the UV / Vis absorption spectrum of the particle samples. The systems and methods may characterize particles in the samples by obtaining light scattering data from multiple angles by a single rotating light detector. The data obtained in this manner may allow a greater dynamic range of particle sizing than when using a single angle.

The application discloses an indicator for indicating Fe 3+ in an acidic medium and a preparation method and application thereof. The indicator contains a salicylic acid structure in the structure, when Fe 3+ is contained in galvanized steel, Fe 3+ can be complexed with the -COOH group and -OH group in the indicator, the solution changes from colorless to purple red, naked eye identification can be realized, meanwhile, ultraviolet-visible absorption spectrum is enhanced, thereby realizing qualitative and quantitative detection of Fe 3+ . In addition, the indicator provided by the application has strong sensitivity in recognizing Fe 3+ , can effectively realize qualitative and quantitative detection of Fe 3+ , and is not influenced by other analytes such as Na + , Ba 2+ , Hg 2+ , Cu 2+ , Ni 2+ , Zn 2+ , Mg 2+ , Ca 2+ , Cd 2+ , Cr 3+ and the like, and has excellent selectivity.

This invention provides a method for analyzing the femtosecond laser-induced damage behavior of Zn-doped KDP crystal surfaces, belonging to the field of engineering optics technology based on computer data processing. First, the effects of Zn doping concentration on the bandgap and electroacoustic coupling of the KDP crystal are analyzed using UV-Vis absorption spectroscopy and Brillouin scattering spectroscopy, respectively. Then, a one-dimensional model is constructed, and the time evolution of electron density, lattice temperature, and electron temperature on the Zn-doped KDP crystal surface under femtosecond laser irradiation is simulated using a rate equation for electron density accumulation and a two-temperature model. The influence of Zn doping concentration on the damage behavior of the KDP crystal surface is theoretically analyzed, and a theoretical model for calculating the femtosecond laser-induced damage threshold is established, thus non-destructively determining the optimal Zn doping concentration. This invention avoids contact with real samples, improving sample utilization; the simulation process is more stable and controllable with high data repeatability; it can also shorten the research cycle and accelerate the selection of the optimal doping concentration.

The invention belongs to the technical field of nano materials, and discloses a preparation method of an Au nano material with a layered hybrid superlattice structure. According to the method, a coordination confinement synthesis strategy is adopted, 4-mercaptobenzoic acid is taken as a structure-directing agent, and the organic-inorganic alternating layered superlattice structure is successfully prepared under the condition of CO weak reduction by utilizing a strong coordination bond formed by sulfydryl of 4-mercaptobenzoic acid and gold and a pi-pi conjugate synergistic effect of a benzene ring and combining a soft template confinement effect of octadecylamine. The superlattice material has a long-range disordered amorphous structure and an adjustable interlayer spacing (2.9 to 4.7 nm), and shows the white light emission characteristics of wide-spectrum ultraviolet-visible absorption (250 to 600 nm) and adjustable color temperature (3200 to 6500 K). According to the invention, a quantitative structure-function relationship of interlayer spacing-ligand metal interaction-optical performance is established, effective regulation and control of intersystem crossing process and phosphorescence lifetime from microsecond to millisecond magnitude are realized, and an innovative solution is provided for solving the problem of metal-organic layer interface compatibility; and an important material platform and theoretical support are provided for developing a novel flexible photoelectric device.

The invention discloses a method for analyzing the interaction between a biomolecular condensate and a drug, and provides a signal report strategy based on the ultraviolet visible light absorption characteristic of the drug, which utilizes the unique space confinement effect of the biomolecular condensate and the influence of a chemical microenvironment obviously different from a water phase on the physicochemical properties of drug molecules to analyze the interaction between the biomolecular condensate and the drug. The color and ultraviolet-visible absorption spectrum change before and after the action of the drug and the biomolecular aggregate is monitored, and the peak shift and intensity change of the characteristic absorption peak are quantitatively analyzed, so that the interaction analysis of the biomolecular aggregate and the drug is finally realized. The analysis method adopted by the invention is simple to operate, does not need fluorescent labeling or centrifugal separation and other processes, can control the interaction analysis time of a single drug and a biological aggregate within 5 minutes, supports high-throughput analysis, and is suitable for large-scale popularization and application. And the interaction between 96 or 384 or more (depending on the specification of the microplate) drugs and molecular aggregates can be analyzed within 5 minutes.

The application discloses a method for identifying Fe by using 2-amino-5-substituted-1, 3, 4-oxadiazole. 3+ The method comprises the following steps: firstly, preparing a 2-amino-5-substituted-1, 3, 4-oxadiazole solution to be detected; secondly, adding a metal cation solution into the solution to be detected; and thirdly, identifying Fe by naked eye observation and ultraviolet-visible absorption spectrum. 3+ The method has good selectivity for Fe 3+ , is not interfered by other ions, and can better identify and detect Fe in the environment. 3+ ​

The invention relates to the technical field of nuclear material analysis, in particular to a plutonium solution specific activity determination method and application, and the plutonium solution specific activity determination method comprises the following steps: taking a plutonium solution with known specific activity A1 as a standard solution, determining the liquid flash counting rate of the standard solution, and recording the liquid flash counting rate as C1; obtaining a second-order conductance spectrum of the standard solution by using an ultraviolet-visible absorption spectrum method, determining the peak area of a characteristic absorption peak of tetravalent plutonium in the second-order conductance spectrum of the standard solution, and recording the peak area as S1; measuring the liquid flash counting rate of the to-be-measured solution, and recording the liquid flash counting rate as C2; obtaining a second-order conductance spectrum of the to-be-detected solution by using an ultraviolet-visible absorption spectrometry, determining the peak area of a characteristic absorption peak of tetravalent plutonium in the second-order conductance spectrum of the to-be-detected solution, and recording the peak area as S2; and calculating the specific activity A2 of the solution to be detected according to the following formula. According to the method, liquid scintillation counting and ultraviolet-visible spectrophotometry are combined, so that combination of activity response and concentration response is realized, and acquisition of isotope composition of a plutonium solution to be detected and complex sample pretreatment are not needed.

The invention relates to the technical field of water quality monitoring, in particular to a DOC monitoring method and device, a medium and a product. Comprising the following steps: collecting an ultraviolet-visible absorption spectrum of a water sample to be detected; a spectral boundary wavelength is determined, the ultraviolet-visible absorption spectrum is divided into a first wave band and a second wave band based on the spectral boundary wavelength, the spectral characteristics of the first wave band are associated with the contribution of the macromolecular DOC, and the spectral characteristics of the second wave band are associated with the contribution of the micromolecular DOC; dividing the ultraviolet-visible absorption spectrum on the basis of the spectrum boundary wavelength, and respectively and quantitatively obtaining the concentration of the small-molecular DOC and the concentration of the large-molecular DOC; the macromolecular DOC concentration is used for regulating and controlling ozone addition, and the micromolecular DOC concentration is used for regulating and controlling operation of the intelligent water affair system. The technical problems that a water treatment process in related technologies cannot be accurately regulated and controlled according to water quality composition changes, the operation cost is high, the generation risk of disinfection by-products is large, and the process efficiency is reduced can be at least solved.

The application relates to a solar cell and a preparation method thereof, a photovoltaic module, a power generation device and a power utilization device. The solar cell comprises a first electrode, a functional layer, a photoelectric conversion layer and a second electrode which are stacked along the thickness direction of the solar cell. The functional layer comprises an organic polymer, and the organic polymer comprises a hole transport group. The functional layer satisfies A2<=A1 and A2>=0.8*A1, A1 represents the maximum absorption peak of the functional layer in the wavelength range of 200-400 nm in the ultraviolet-visible absorption spectrum, and A2 represents the maximum absorption peak of the functional layer after being soaked in chlorobenzene for 5 min in the wavelength range of 200-400 nm in the ultraviolet-visible absorption spectrum. The photoelectric conversion efficiency of the solar cell can be further improved.

The present application relates to a kind of for detecting colloidal semiconductor quantum dot spectroelectrochemical device and method.The device combines electrochemical workstation and spectroscopic detection system, for real-time monitoring the structural change of molecule and material in electrochemical reaction process.The core technology includes the accurate control of the redox state of sample, and obtains key molecular information by various spectroscopic analysis means (such as ultraviolet-visible absorption spectrum, infrared spectrum, raman spectrum etc.).Device design adopts modular structure, includes reference electrode, counter electrode and working electrode, to ensure the stability of reaction and the reliability of data.The method is suitable for the identification of electrocatalyst active site, the electronic structure regulation of material, the research of interface chemical reaction mechanism and the like.

The invention discloses synthesis and antibacterial application of a thiophene D-II-A type organic photosensitizer based on molecular modification, and a compound TPA-SFCN with excellent performance is synthesized by improving the molecular structure of a natural photosensitizer 2, 2 ': 5', 2 ''-trithiophene-5-formaldehyde. In the invention, the thiophene compound is used as an efficient electron transfer pi bridge, and functional groups of electron donor triphenylamine (TPA) and electron acceptor cyano (CN) are successfully introduced through ordered molecular engineering modification. The modification is realized through a simple and efficient chemical reaction, so that the target compound shows a remarkable red shift phenomenon in the aspect of spectral characteristics, including simultaneous red shift of an ultraviolet-visible absorption spectrum and a fluorescence emission spectrum. In addition, compared with an initial compound, the TPA-SFCN shows remarkably improved singlet oxygen generation efficiency and bactericidal ability, so that the TPA-SFCN shows wide application prospects and important development value in the field of organic photosensitive therapy.

A catalyst includes an oxide containing titanium (Ti) and a copper (Cu). In an ultraviolet-visible absorption spectrum of the catalyst, a ratio I400 / I600 of an intensity I400 at a wavelength of 400 nm to an intensity I600 at a wavelength of 600 nm may be 0.5 to 3.

The present invention discloses an optimization calculation method for the absorption coefficient of a semiconductor thin film material grown on a transparent substrate. The calculation process includes the following steps: first, the ultraviolet-visible absorption spectrum and reflection spectrum of the semiconductor electrode are tested by a UV-visible spectrophotometer, and then the measured absorption value is corrected by the reflection spectrum. Next, the absorption value is subjected to Min-Max standardization to make it more realistic, and finally the absorption coefficient of the pure semiconductor film is derived using the relationship between the absorption coefficient and the absorption value. The present invention mainly optimizes the calculation of the absorption coefficient of a pure semiconductor film by using the UV-visible absorption spectrum and the reflection spectrum, and proposes a method for calculating the absorption coefficient of a pure semiconductor film. This method can be applied to any semiconductor thin film electrode, and provides a basis for accurately calculating the absorption coefficient of the semiconductor film.

The present invention relates to a PSA detection method based on CRISPR / Cas12a and hybridization chain reaction amplification. First, through the hybridization chain reaction amplification based on nucleic acid aptamers, the signal of PSA is converted into a DNA signal. The repetitive DNA structure of the hybridization chain reaction product can recognize and activate the reverse cleavage function of the CRISPR / Cas12a system, and cut the single-stranded DNA connecting two gold nanoparticles into fragments containing 2-4 bases, causing the gold nanoparticles to change from an aggregated state to a dispersed state, and the color of the solution shows a change from purple to red. The present invention studied the feasibility of this method through ultraviolet-visible absorption spectroscopy, visible color change and dynamic light scattering (DLS).

The invention relates to the technical field of environment monitoring and intelligent sensing, and discloses a seawater sample residual chlorine online monitoring method combined with intelligent sensing. The method comprises the following steps: synchronously acquiring multi-source heterogeneous data through a multi-mode electrochemical sensing array and a micro ultraviolet-visible absorption spectrum module, carrying out feature decoupling by utilizing a deep auto-encoder and an independent component analysis joint model, extracting a free residual chlorine exclusive component, and correcting salinity, turbidity and organic matter interference in combination with a dynamic environment compensation model, so as to obtain the free residual chlorine content. And finally, high-selectivity and high-sensitivity real-time concentration calculation is realized. The device has adaptive signal decoupling and on-line model fine tuning capabilities, inhibits cross interference and long-term drift, realizes reagent-free and continuous on-line monitoring, and improves the accuracy and reliability of residual chlorine detection in the marine environment.

The invention discloses a ratio-type fluorescent probe based on dual-emission europium-containing carbon dots, a preparation method and application of the ratio-type fluorescent probe in detection of tetracycline antibiotics, and belongs to the technical field of fluorescent probes. Histidine and europium nitrate are used as precursors, the fluorescent powder is obtained through one-step synthesis with an ethanol-water solvothermal method, and the fluorescent powder has blue fluorescence located at 440 nm and Eu < 3 + > characteristic red fluorescence located at 615 nm. When the probe acts with oxytetracycline, the oxytetracycline as an antenna ligand and Eu < 3 + > are subjected to efficient energy transfer, so that red fluorescence at 615 nm is remarkably enhanced, and blue fluorescence at 440 nm is kept stable, thereby realizing ratio-dependent fluorescence response along with visual luminescence color change from blue to red luminescence. According to the method, fluorescence of the probe is combined with ultraviolet-visible absorption spectrum data, a multi-signal sensing platform is constructed by utilizing linear discriminant analysis, and accurate identification and quantitative analysis of various tetracycline antibiotics are successfully realized.