170 results about "Concentration curve" patented technology

An apparatus and methodological framework are provided, named perfusion angiography, for the quantitative analysis and visualization of blood flow parameters from DSA images. The parameters, including cerebral blood flow (CBF) and cerebral blood volume (CBV), mean transit time (MTT), time-to-peak (TTP), and T_max, are computed using a bolus tracking method based on the deconvolution of time-density curves on a pixel-by-pixel basis. Individual contrast concentration curves of overlapping vessels can be delineated with multivariate Gamma fitting. The extracted parameters are each transformed into parametric maps of the target that can be color coded with different colors to represent parameter values within a particular set range. Side by side parametric maps with corresponding DSA images allow expert evaluation and condition diagnosis.

The invention discloses a real-time detection and analysis method of an indoor air bacteria content based on the Internet of Things. The method comprises the steps of: generating a bioaerosol detection concentration curve; generating a particle concentration curve; performing statistics on environmental parameters within a set time range; performing calculation in combination with the bioaerosol detection concentration curve and the particle concentration curve to obtain the real-time bioaerosol concentration in the current environment; and performing calculation in combination with a room type to obtain an indoor air real-time bacteria content in the current environment. By adopting of the real-time detection and analysis method disclosed by the invention, the real-time detection of the bacteria content in the current environment can be achieved to guide the startup of disinfection and sterilization equipment and to assist the decision making of the indoor environmental emergency treatment, in addition, in combination with an access control subsystem, a photographing subsystem an environment detection subsystem, the change trend of the indoor air bacteria content is estimated, early warning in advance is achieved, the instructions are more precise, the energy consumption is effectively reduced, the early warning of high-risk environment is timely, the occurrence of mass healthevents is reduced, meanwhile the process can be tracked, and the result can be traced.

The invention relates to a method for online detection of the concentration of electrolyte of an all vanadium redox flow battery. A divalent vanadium V (II) system, a trivalent vanadium V (III) system and a tetravalent vanadium V (IV) system are analyzed by the aid of ultraviolet and visible spectrophotometry, a divalent vanadium V (II) and trivalent vanadium V (III) mixed system and a trivalent vanadium V (III) and tetravalent vanadium V (IV) mixed system are analyzed by the aid of a K matrix method, and a curve equation of the concentration of the vanadium with various valence states and absorbance in the systems is deduced. The concentration of vanadium ions with various valence states in a test sample can be rapidly detected only by substituting absorbance data of the test sample with unknown concentration in the electrolyte of the vanadium battery into the absorbance-concentration curve equation measured and deduced by the method, and accuracy of the method is proved as compared with a national standard method. The method has a huge application prospect in terms of dynamically monitoring valence changes of the electrolyte of the vanadium ions and simultaneously, qualitatively and quantitatively checking the vanadium electrolyte with mixed valence states.

The present invention relates to the technical field of reservoir description in oil field development, in particular to a fracture-cavity inter-well communication passage and flow parameter characterization method. The method comprises the following steps of: (A) establishing an analytical expression of describing a fracture-cavity reservoir inter-well flow rule; (B) establishing a tracing production concentration curve fitting mathematical model; (C) performing curve fitting model solution; and according to principles of the three steps, compiling fracture-cavity reservoir tracing curve fitting software, performing fitting on a theoretical tracing curve and an actually measured tracing curve by a method of adjusting a parameter on a software interface, and simultaneously carrying out calculation to obtain mass mik, a flow velocity vik, an orifice area Aik and a flow duct length lik of a fracture-cavity injection tracer so as to implement characterization on a communication passage and a flow parameter. According to the present invention, an established model of describing the flow rule of the fracture-cavity reservoir tracer further accords with the true situations; quantitative calculation characterization on the fracture-cavity reservoir inter-well communication passage and the flow parameter is implemented; and in the fitting process, automatic fitting of a computer and parameter regulation of a worker are combined.

The invention relates to a downhole wireless safety monitoring system based on mixed networking of 2.4 GHz and 433 MHz frequency ranges. The system consists of mobile nodes, fixed nodes, a gateway node, a transmission node and a ground main frame, wherein the mobile nodes are mainly carried by miners and are provided with sensors for monitoring the body temperature and pulse of each miner; the fixed nodes arranged in mine roadways are also provided with sensors for monitoring ambient gas density at real time; the ground main frame receives data collected in the downhole, displays personnel positioning information and physiological parameter information at real time, displays a gas density curve at real time, and is capable of setting up an overrun alarm and releasing act of rescue information to the downhole.

An X-ray computed tomography apparatus calculates transfer functions h(t) using a time-concentration curve Ca(t) for pixels of a cerebral artery and a time-concentration curve Ci(t) for pixels of cerebral tissues including capillary vessels and then calculates a delay time for each pixel of an object region from a time when an artery curve rises on the basis of the transfer functions. Further, the apparatus differently produces a visual color map showing time differences of blood flow conditions and provide it in a predetermined form by coloring pixels with a time delay from the other pixels without a time delay on the basis of the calculated delay time.

The invention relates to a pipeline flow tracer test comprehensive device of a pressure bearing karst aquifer system. The pipeline flow tracer test comprehensive device is composed of an overflow trough for controlling the water level of the whole aquifer system, a loose sand trough containing even media, three seepage pipelines different in length in a trough body, observation holes and water outlet sampling holes, wherein the seepage pipelines are provided with micropores and maintain hydraulic connection with the loose sand layer. A tracer agent injection pipe hole and a control valve are arranged at the most front water inlet end of each pipeline. The water level of the water inlet end and the water outlet end of the overflow trough is used for controlling the changes of the underground flow field of the aquifer system of a simulation trough, and the dual-medium environment with even hole seepage and pipeline flow is formed. Water is supplied through a submersible pump in the test, an automatic collecting system is used for recording the water level of an aquifer, samples are regularly collected from the sampling holes, the peak value features of the changes of the concentration of the tracer agent in the karst pipeline flow in the submersible water (confined groundwater) karst aquifer system are obtained through tracer agent concentration curve features, and scientific basis is provided for finding the development law of karst channels in the underwater system in field carbonate areas.

The invention provides a defect detection method and a defect detection device. In the defect detection device a camera part obtains a checked image of a substrate, and an edge extracting filter extracts the edge by extracting binary from the checked image. Then based on a concentration curve chart of a graph with edge removal from the checked image, the method calculates a checking threshold forgenerating a checking processed image which enable the checked image binarization. In the contentration curve chart, because the edge is removed, a pixel frequency is ''0'' at a concentration belt between a concentration distribution corresponding to a wiring diagram and a concentration distribution corresponding to a substrate body, thereby definitely separating two concentration distributions. Thus the invention can employ the maximum concentration of the concentration distribution corresponding to the substrate body as a checking threshold, and high precisely calculate the checking threshold.

The invention relates to a secondary light concentration device which comprises a plurality of petal-shaped light concentration modules which are circumferentially distributed and integrally fitted into a light concentration surface; the focal lengths of the light concentration modules can be flexibly adjusted through a light concentration module adjusting assembly to realize a modularized focal-length-adjustable function of a secondary reflection light-concentration curve, and therefore the flexibility of the secondary light concentration device is improved, the installation precision requirement is reduced, and the installation and maintenance cost is decreased. The invention also relates a secondary light concentration system provided with the secondary light concentration device; the secondary light concentration system is provided with a single-column-type support structure at one side of the secondary light concentration device so that the shielding problem is effectively solved, and therefore the available range of a ground heliostat is greatly increased; in addition, by means of a secondary light concentration device inclination adjusting assembly of the secondary light concentration system, a variable optical axis function of the secondary light concentration device is realized, and therefore the requirements of target surfaces of various angles of heat absorbers are met, and the adaptation capability and the application range of the secondary light concentration system are greatly increased. The invention also relates to a solar thermal power generation system provided with the secondary light concentration system.

The invention relates to a method for identifying Chinese herbal medicine by using electrochemistry. The method comprises the following steps: pulverizing Chinese herbal medicine into powder, adding to a mixture (a finite concentration) of sulfuric acid, manganese sulfate, acetone and potassium bromate, and completely stirring to carry out a chemical oscillating reaction, thereby obtaining a mixed solution; transferring the mixed solution to an electrochemical working instrument with an oxidation-reduction electrode, starting to measure and record, and drawing a reaction map; converting the reaction map into data by the electrochemical working instrument, recording and storing the data, thereby obtaining the map data of the Chinese herbal medicine; and changing the amount of the Chinese herbal medicine with the state of the chemical oscillator unchanged to obtain a series of data, drawing an amplitude-concentration curve chart, and qualitatively and quantitatively identifying the Chinese herbal medicine based on the chart which directly reflects the relationship between the amplitude and the concentration. The novel method for identifying Chinese herbal medicine is scientific and effective, has the advantages of simple operation and convenient mastery, and is beneficial to accelerating the modernization of the Chinese herbal medicine.

The invention relates to the related technology in the field of tight oil fracturing fluid backflow tracing, in particular to a method for evaluating the segmented water production rate of a multi-stage tight oil fracturing well by using a tracer. The method comprises the following steps: during the segmented tight oil fracturing process, injecting different types of trace element tracers into each fracturing interval according to the design concentration and amount, continuously monitoring a fracturing process construction curve and acquiring the original formation pressure of each interval,the total amount of the fracturing fluid, and the pump stoping pressure; during the fracturing fluid backflow process, continuously sampling and testing the concentrations of different types of traceelement tracers in the backflow fluid, wellhead backflow fluid production, and wellhead pressure by adopting the "density first and then sparsity" strategy; and according to the monitoring data, drawing concentration curves of different types of tracers with respect to the total fluid volume, selecting the concentration value that can represent the segmented fluid production capacity, calculatingthe formation pressure and bottom hole pressure of each fracturing segment at different time, segmented backflow fluid volume, and the water production rate and water content of formation, and evaluating fracturing effects.

The invention relates to an optimized quantitative method of blood volume in a magnetic resonance perfusion imaged image. The optimized quantitative method is technically characterized by comprising the steps of: selecting an artery input function with a typical double-peak shape from an encephalic main central artery of the magnetic resonance perfusion imaged image; carrying out a convolution operation on a contrast agent concentration time sequence signal and the artery input function to obtain a residual function with similar single-peak shape; using gamma function fitting to select the artery input function to obtain a first pass of the artery input function; carrying out the convolution operation on the first pass of the artery input function which is obtained by fitting and the residual function, thus reestablishing a first pass component in an initial time-contrast agent concentration curve; and quantizing the blood volume by using the reestablished first pass component and inhibiting quantization error. By combining a first pass reestablishing algorithm with a contrast agent percolation effect correction algorithm, the invention furthers to inhibit the blood volume quantization error.

The invention provides a control method for vanadium extraction by a converter for removing vanadium and holding carbon, belonging to the technical field of metallurgical vanadium extraction. The control method adopts a fume analysis method and comprises the following steps of: connecting the signals of CO and O2 concentration curves to a computer to form continuous curves; determining the addingtime of a coolant in the vanadium extraction converting process according to the change of the CO content in the fume; prolonging the optimum temperature interval of vanadium oxidation in the converting process; and judging the vanadium extraction terminal by combining with the oxygen consumption in a vanadium extraction model. Under the condition of same molten iron, the carbon content of semi-steel can be stably controlled at 3.70-3.90% with the average value of 3.86%, which is improved by 0.14%, thus providing a stable semi-steel condition for the next steelmaking process, effectively avoiding the terminal after-blow phenomenon caused by shortage of steelmaking heat of the semi-steel, and solving the quality problem of the molten steel caused by serious after-blow. The content of residual vanadium is controlled at 0.030-0.050% and reduced by 0.004%, the average content of residual vanadium reaches 0.039%, the vanadium oxidation rate reaches 81-92% with the average value of 85% which is improved by 2% compared with the background art, and the recovery rate of vanadium is correspondingly improved, thus further improving the key technical indexes in vanadium extraction.

The invention relates to the field of gas monitoring, and discloses a method and a device for monitoring methane or non-methane hydrocarbon. The method comprises the steps of (1) filling a total hydrocarbon detector with standard gas, and establishing a total hydrocarbon concentration curve; enabling the standard gas to pass through a catalytic oxidation device, then filling a methane detector with the standard gas, and establishing a methane concentration curve; (2) heating sample gas, and then filling the total hydrocarbon detector with the heated sample gas; heating the to-be-detected sample gas, enabling the heated sample gas to pass through the catalytic oxidation device, and then filling the methane detector with the sample gas; (3) obtaining the concentration value of total hydrocarbon and the concentration value of methane, namely, the concentration value of the non-methane hydrocarbon in the sample gas according to the step (1) and the step (2). The catalytic oxidation device is used for oxidizing all hydrocarbon gases except the methane in the gas into water and carbon dioxide, so that the concentration signal of the methane can be directly detected; the method has the advantage of detecting the methane or the non-methane hydrocarbon in the gas in real time, and is convenient and simple in data processing, thus having very high market competitiveness and application value.

The invention relates to a hepatic functional reserve detector capable of removing blood oxygen fluctuation interference. The hepatic functional reserve detector consists of a photoelectric finger clip sensor, a data memory, a liquid crystal display module, a light source driving circuit, a microprocessor, a signal separating circuit, a signal amplifying circuit, an A/D (analog/digital) conversion circuit, a wireless communication module and a computer, the photoelectric finger clip sensor is respectively connected with the data memory and the liquid crystal display module via the light source driving circuit and the microprocessor, the photoelectric finger clip sensor is connected with the microprocessor via the signal separating circuit, the signal amplifying circuit and the A/D conversion circuit, the microprocessor is connected with the wireless communication module, and the computer is connected with the wireless communication module via Bluetooth. A concentration spectrum of indocyanine green (ICG) pigment used as indicator is separated from a blood oxygen absorbing spectrum, inference of low blood oxygen and blood oxygen fluctuation to pigment concentration measurement is suppressed, a diluted concentration curve of the ICG pigment injected via a vein is accurately measured, the purpose of non-invasively and continuously measuring cardiovascular and hepatic haemodynamics parameters such as pigment blood plasma disappearance rate K, 15-minute detaining rate R15 and the like is achieved, surgery risks can be accurately predicted by means of detecting hepatic functional reserve, a proper therapy mode is selected, and operative mortality and postoperative complications can be effectively reduced.

The invention discloses a test substance concentration calculation method applied to a rapid test strip detection technology. The method comprises the steps as follows: detecting a standard concentration sample to fit a standard concentration curve between T/C and concentration of a target test substance, and acquiring a photograph of the test strip impregnated with the test substance; cutting out the part,containing a fluorescent signal, of the photograph; performing grayscale processing to obtain a two-dimensional array; calculating the average of all the rows (or columns) of the two-dimensional array to obtain a one-dimensional array; removing noise by filtration; eliminating baseline drift; searching for the peak and calculating the peak area ratio T/C; substituting the peak area ratio into the standard concentration curve for conversion of a concentration value. With the adoption of the method, an accurate ratio T/C of the detection band signal T to the quality control band signal C can be obtained, taken as judgment information and substituted into the standard concentration curve, and the accurate concentration of the test substance is obtained, therefore, the accuracy of detection is effectively improved.

The invention discloses a device for testing concentration of a gas extinguishing agent and a testing method of the device. The invention is characterized in that a gas filter, a heating and temperature control module, a flow control module, a concentration test module, a data processing module and a serial port communication module are assembled in a case body; a gas inlet is formed at the front end of the case body and a vacuum pump is connected to the rear end of the case body; the communication with a computer is achieved through a serial port; and the gas extinguishing agent concentration data is transferred to the computer after data processing. The gaseous mixture of air and gas extinguishing agent is pumped into the testing device through the vacuum pump, treated by the gas filter to remove foreign substances and heated to a preset temperature by a gas heater and then flows into the concentration test module; after the concentration data is obtained based on the thermal film sensing principle, the gaseous mixture is discharged through the outlet of the vacuum pump; the concentration data is processed by the data processing module to obtain concentration values of the gas extinguishing agent; and the concentration curve of the gas extinguishing agent is recorded by the computer. The device and method can be widely applied to test concentrations of different types of gas extinguishing agents and provide a support for evaluating fire extinguishment performance of gas extinguishing systems.

The invention discloses a method for detecting content of silver ions through fluorescence, and discloses a method for detecting the concentration of the silver ions. The method comprises the steps of depending on characteristics that an i-motif structure can be formed through silver ion adjustment and cyanine dye aggregates can identify the i-motif structure, adding a liquid sample to be detected into a mixed solution of cyanine dye and DNA molecule capable of forming the i-motif structure, and finding out a corresponding silver ion concentration value on a standard silver ion concentration curve by measuring a fluorescence intensity value at the wavelength of 530-700nm. The method is high in specificity and high in selectivity; reagent components are simple, and a reaction process is simple; an error caused by operation can be effectively reduced, and the test precision is high. The method can realize quick detection through a common fluorescence spectrometer, and a special or extra instrument is not needed; the detection cost is low; the method is convenient for industrial popularization and application.

The invention discloses a method for obtaining chlorine ion diffusion and combination parameters in a cement-based material. The method only needs a total chlorine ion concentration curve, and can simultaneously obtain a chlorine ion effective diffusion coefficient and adsorption isothermal curve parameters through regression calculation. The method comprises the following steps: obtaining a total chlorine ion concentration distribution curve by a non-steady state diffusion test; trying different combinations of to-be-obtained parameters, calculating to obtain a theoretical total chlorine ion concentration distribution curve; carrying out fitting regression of the theoretical curve and the experimental curve by a nonlinear least square method, to obtain a set of parameter values with the highest fitting degree; calculating the confidence interval of each parameter; and further calculating to obtain an adsorption curve, distribution curves of an apparent diffusion coefficient along with the time and space, and distribution curves of total chlorine ions, combined chlorine ions and free chlorine ions in the time and space. The method not only can obtain the diffusion parameter and the combination parameter, but also can obtain the intervals of the parameters.

The invention provides a method and device for determining boiler operation oxygen content and an automatic control system. The method comprises the steps that the CO concentration and NOx concentration of smoke gas in a denitration inlet at a preset operating point are obtained; the NOx concentration curve rate produced when the CO concentration in the smoke gas in the denitration inlet is smaller than a preset value is determined; according to the operation oxygen content value corresponding to the minimum value of the curve rate, the boiler operation oxygen content is determined. The optimal operation oxygen content of a low-NOx combustion boiler can be rapidly determined through the NOx concentration curve rate produced when the CO concentration in the smoke gas in the denitration inlet is smaller than the preset value, the operation oxygen content of the boiler is automatically controlled, high-efficiency combustion is ensured, and meanwhile the low-level hearth outlet NOx concentration can be kept.

The invention discloses an anti-clogging design method for an emitter used for eliminating the suspended particle aggregation position in a runner, which comprises the following steps: constructing ageometrical structure model of the internal runner of the drip irrigation emitter, and determining the boundary conditions of an inlet and an outlet of the runner; adopting a computational fluid dynamics (CFD) solid-liquid two-phase flow model to carry out the numerical simulation on the runner model according to the boundary conditions; extracting the cross section with the percentage of the content of suspended particles in the runner, and modifying the runner model according to the minimum concentration curve of the suspended particles; and repeating the steps, and filtering out the runnershape with the maximum concentration of the suspended particles which is nearest to the concentration of the suspended particles at the inlet. The anti-clogging design method firstly takes into full consideration of the hydraulic performance, the anti-clogging performance and the runner processing of the drip irrigation emitter and can form the better runner structural form.

The invention relates to the technical field of medical detection and especially relates to a urine protein detector and a use method thereof. The urine protein detector comprises a casing, a machinecore and a buzzer, wherein operation keys, a display screen and a glass plate are arranged on the casing; a test paper groove for storing test strips is also arranged on the casing; a camera, an LED lamp and a luminance transducer are arranged right under the glass plate in the casing; the machine core comprises a storage battery and a single chip microprocessor; a controller, a storer, a processor and a calculator which are mutually in communication connection are arranged in the single chip microprocessor; a quantitative relation can be a simple coefficient, an analytic formula, an empiricalformula or mathematic relation stored in a database in a standard concentration curve mode and other similar mathematic relations; the luminance transducer and the camera are both in communication connection with the single chip microprocessor; the LED lamp, the display screen and the buzzer are all in control connection with the single chip microprocessor. The urine protein detector disclosed bythe invention can achieve quantitative detection on urine protein in urine by collecting, comparing and calculating test paper color developing images; furthermore, results are screen displayed and voice broadcasted; the urine protein detector has the advantage of simpleness and convenience in operation.

The invention relates to a method for detecting a concentration of a soft movable gel microsphere (SMG) of a deep oil displacement and profile control agent. The method comprises the steps of: preparing the SMG microsphere to have 4-8 standard concentrations by using in-place injection water, transferring 5ml of standard solution, adding 5-10g of digestion accelerator and 6-30mL of concentrated sulfuric acid, digesting at a digestion temperature of 400-500 DEG C for 1-2h; after the digestion is completed, cooling to reach room temperature, adding 40 percent sodium hydroxide, distilling to obtain inorganic ammonia, absorbing generated ammonia by using a 2 percent boric acid solution, using a methyl red-bromocresol green mixed indicator as an indicator, titrating an absorption solution by using standard hydrochloric acid to obtain a mmol number of consumed hydrochloric acid; and drawing a horizontal coordinate as the mmol number of the consumed hydrochloric acid and a vertical coordinate as an SMG concentration curve of the SMG concentration to obtain a linear regression equation, and figuring out the content of the SMG in an extraction solution by using the linear regression equation. The method can be used for accurately measuring the concentration of the SMG in the extraction solution.

The invention relates to a total hydrocarbon intelligent logging system. A geologic parameter acquisition unit in drilling engineering, a tracking control unit of an electric degassing unit and an infrared total hydrocarbon gas analytic unit which adopt a standard industrial control chassis as a shell to form a drawer type structure are arranged in an integral machine cabinet with a computer host, a UPS power supply and a tool box simultaneously; the circuit connection thereof is as follows: the computer host respectively adopts an RS232 serial port and is bidirectionally connected with the geologic parameter acquisition unit in drilling engineering, the infrared total hydrocarbon gas analytic unit and the automatic tracking control unit of the electric degassing unit and the automatic tracking control unit of the electric degassing unit and the degassing unit are connected bidirectionally; the sampling of sample gas of the electric degassing unit enters the infrared total hydrocarbon gas analytic unit; and the infrared total hydrocarbon gas analytic unit is simulated and output by D/A. The system can simultaneously print drilling time curve and total hydrocarbon concentration curve and has compact structure, beautiful appearance, convenient installation, carrying, debugging and maintenance for the instrument.

The invention relates to a method for detecting the content of proteins in chitosan or a chitosan salt. The method comprises the following steps: (1) preparing a Coomassie brilliant blue G-250 test solution; (2) weighing a chitosan or chitosan salt sample, and preparing a sample solution with a concentration of 5 mg/ml; (3) preparing protein standard solutions with different concentrations, addingthe Coomassie brilliant blue G-250 test solution, and drawing an absorbance-concentration curve; and (4) adding the Coomassie brilliant blue G-250 test solution to the sample solution, measuring theabsorbance of the sample solution at 595 nm, and calculating the content of proteins in the sample. A chitosan/chitosan salt system to be detected undergoes ultrasonic treatment under a condition witha hydrochloric acid concentration of below 2% for 15 min, undergoes 100 DEG C water bath treatment, and is stained with the Coomassie brilliant blue G-250 test solution with a specific concentration,and the absorbance at 595 nm is detected, so the accuracy of the protein detection value is significantly improved.

The invention discloses a method of researching a reaction mechanism by utilizing MCR-ALS (Multivariate Curve Resolution-Alternating Least Squares) combined with an infrared online spectrum. The method comprises the steps of: inserting an infrared optical fiber probe in a reactor to collecting infrared spectrum data online, and performing wavelet transform denoising and baseline correction on the collected infrared spectrum data; then comparing subspaces obtained by separating different ingredient numbers through using two algorithms of main ingredient analysis and simplification self-mode; finally determining the ingredient numbers in a system to finish pretreatment; performing evolving factor analysis on obtained pretreatment data to obtain relative concentration discreet values of the ingredients in the system, substituting the relative concentration discreet values in an MCR-ALS program to perform alternating least-squares iteration for 200 times to obtain a concentration curve graph and a pure ingredient infrared spectrum of the ingredients of the finally optimized system, deducing the structure of each substance by combining an analyzed infrared spectrogram of each substance, and deducing the reaction mechanism by combining the concentration curve graph. According to the method, no additional intermediate capture agent is needed, thereby saving reagents; the online measurement mode guarantees accurate data and prevents information from being lagged; and only infrared online data are necessary, so that the measurement mode is simple, and various reactions can be measured.