50 results about "Peak response" patented technology

The invention discloses a reflective GaA1As photoelectric cathode with the sensitive peak response at 532nm and a preparation method of the reflective GaA1As photoelectric cathode. The cathode comprises a GaAs substrate (1), a Ga1-x1A1x1As buffer layer (2), a Gal-x2A1x2As doping concentration gradient emission layer (3) and a Cs/O activating layer (4), which are orderly superposed from the bottom up. A well growing Ga1-x1A1x1As photoelectric cathode component is chemically cleaned, heated, purified and activated via (Cs, O), and the Cs/O activating layer is finally formed on the surface of the Ga1-x2A1x2As doping concentration gradient emission layer. According to the invention, the problems that the response wave band is wide and the existing GaAs photoelectric cathode generates large noises at 532nm and cannot be used around the clock are solved.

The present invention relates to a detection method for odor substances in a water environment. The detection method comprises: (1) standard curve preparation: preparing different concentrations of mixing standard solutions of various odor substances, carrying out a pre-treatment, carrying out gas chromatography and mass spectrometry detection, corresponding the detected mass spectrometry response values and the detected chromatography peak response values of each odor substance to the concentration, and preparing a standard curve; (2) water sample collection and storage: collecting a water sample to be detected, and placing into a preservation container so as to be stored; and (3) water sample detection: taking out the stored water sample, carrying out a pre-treatment, transferring to a gas chromatograph-mass spectrometer so as to be detected, and combining the detected mass spectrometry response value and the standard curve prepared in the step (1) so as to obtain the concentration of the odor substance in the water sample. Compared with the detection method in the prior art, the detection method of the present invention has advantages of precise quantitation, high odor substance recovery rate, environmental protection, easy operation and the like.

The invention discloses a quantum well infrared detector of a photonic crystal coupling narrowband response. A photonic crystal is combined with a quantum well infrared detecting unit; and the photonic crystal, as a coupling unit, is directly nested in the infrared detecting unit. The modulation of a periodic surface structure and the photonic crystal to photon state leads the response of the quantum well infrared detecting unit to specific wave bands to be strengthened, while the response to other wave bands is restrained, thus achieving the detection of narrow band. Compared with the traditional quantum well detector, the detector has the advantages as follows: firstly, response wave band is narrow. The detector can regulate the position of peak response wavelength through the regulation and control of the photonic crystal to the photon state and the self structure control of the quantum well; secondly, the detection efficiency of the peak wavelength is high. Due to the realization of the control of the photon state, the detection efficiency is improved; and thirdly, user-oriented design is facilitated. New design dimension is provided for the regulation and control of the photon state, thus being more convenient for optimizing the matching property of response wave band of product according to the needs of the users.

A method for determining a surface quality of a substrate sample using a differential interference contrast microscope is described. The microscope includes an eyepiece, an eyepiece focus adjustment, a microscope focus adjustment, a light source, at least one of an aperture or reticule, a camera view, a prism and an eyepiece. The method includes calibrating the focus of the eyepiece with the focus of the camera and determining a peak response ratio for the microscope through adjustment of phase between differential beams of the microscope. The substrate sample is placed under the microscope, illuminated with the light source, and brought into focus with the microscope focus. Phase between differential beams is adjusted, at least one image of the substrate sample is captured and processed to determine a level of surface structure on the substrate sample.

In a substrate in which a reflection coefficient γ of a surface acoustic wave per electrode is small, the invention obtains a Q value or a CI value level, which is equivalent to or higher than that of a related art product, at a device size which is equivalent to the related art product which addresses the problem that the size of a surface acoustic wave resonator becomes larger. A surface acoustic wave resonator includes one interdigital transducer to excite a surface acoustic wave in a propagation direction x on a piezoelectric plate and a pair of reflectors arranged on both sides thereof in the propagation direction. The interdigital transducer is divided into three regions. The electrode fingers of the interdigital transducer of each region are formed at a fixed pitch which differs within 2%. The surface acoustic wave resonator possesses a single peak response. The form in which a vibration displacement envelope amplitude in the interdigital transducer region is normalized is a form which takes a maximum value 1 at the center position, which smoothly takes a value in a range of 0.33 to 0.53 at a position ¼ from both ends, and which smoothly takes a value in a range of 0.048 to 0.177 at positions at both ends.

The invention discloses a method for detecting coupling response of transmission cables excited by plane electromagnetic waves. The method is based on a frequency spectrum structure, a field-line coupling physical model and an equivalent circuit model of the incident plane electromagnetic waves and compares the relation of the wavelength gamma 0 of the incident waves with a model met by the length 1 of the transmission cables, thereby respectively obtaining a low-frequency lumped parameter model L(E<inc>,1) and a high-frequency distributed parameter model H(E0, fi, 1, d, alpha, psi and phi); then a first current response I low and a second current response I high are output after the respective treatment of the two models, and the coupling response of the transmission cables is finally obtained after overlapping the first current response I low and the second current response I high. The method simplifies the field-to-line frequency band coupling to the frequency point coupling by seeking peak response frequency points and combines the road model and the distributed parameter model, thereby being capable of rapidly obtaining the response of terminal current of the transmission cables excited by any plane electromagnetic wave. The method simplifies the filed-line coupling problem under the complicated electromagnetic environment and simultaneously provides the reference for the design of equipment-level electromagnetic compatibility and system-level electromagnetic compatibility.

The invention belongs to the technical field of building construction, and discloses a test method for wind-induced internal pressure of a building with openings to avoid the effect of air column resonance. The test method comprises the steps of when the test sampling frequency is 331 Hz, the sampling time is 61.8 seconds, and the total volume after compensation is different times of the originalvolume, verifying the existence of an air column resonance phenomenon; forming partition openings of different sizes to compare and analyze the adverse effect of the air column resonance on the measurement of the pulsating internal pressure; determining the height of a volume compensation box by the calculation of the air column resonance frequency; determining the length and width of the compensation box according to the similar law of internal pressure and the principle that the compensation box is "deep and narrow", ensuring that the air column resonance frequency is in a high frequency region of an internal pressure power spectral density curve, and reducing the effect of the air column resonance energy on the pulsating internal pressure. The calculation formula of the air column resonance frequency of an internal pressure model cavity is introduced through a complex compressor piping system, and the size of the volume compensation box is determined in advance to avoid the adverseeffect of the air column resonance and directly increase the peak response of the internal pressure.

Species detection techniques are described based on measurement of a dynamic response to an external stimulus. One embodiment includes a voltage stimulus applied to a polymer electrolyte fuel cell (PEFC), with the response to said stimulus used to measure CO concentration on the anode catalyst. The principles of symbolic dynamics, finite state machines or a simplified peak response-to-asymptotic value measurement can be used to achieve a high degree of precision for measuring CO concentrations. Using the techniques of the present invention, CO poisoning of a fuel cell can be monitored and diagnosed before reaching a critical condition, thereby allowing early implementation of mitigation or graceful degradation strategies.

The invention discloses a correlation filtering tracking method based on space-time perception and multi-peak response. The method comprises the following steps: firstly, determining the position andsize of a tracking target on a first frame image of a tracking video; training a target prediction model of the tth frame of image by using the position and size of the tracking target determined by the t-1th frame of image; and finally, determining the position and size of the tracking target on the t-th frame of image by using the target prediction model of the t-th frame of image. According tothe method, illumination change and attitude change can occur around the target, continuous and robust tracking can be achieved, wrong updating of the model cannot be affected due to the fact that thetarget is shielded or disturbed by similar objects, the model is always kept in a good state, and the target tracking accuracy rate is high; and meanwhile, real-time data can be quickly processed inthe tracking process, so that the method can be applied to actual life.

The invention discloses an anti-occlusion correlation filtering tracking method and system/device based on multi-peak response. When a target is occluded, most correlation filtering tracking algorithms generate false tracking, an object which occluds the target is regarded as the target, and then a template is updated, so that a model drifts, and finally the tracking fails. According to the anti-occlusion related filtering tracking method, whether a current frame target is occluded or not is detected firstly, and template updating of the current frame is stopped under the condition that it isjudged that the current frame target is occluded early, so that wrong information cannot be learned, and model drifting is prevented. Secondly, an occlusion processing mechanism is added in the anti-occlusion correlation filtering tracking method, the optimal target position of the current frame is found out, when the target appears again, tracking is still correct, and therefore the accuracy androbustness of the tracking algorithm are further improved.

The invention relates to a method for quickly detecting quality of frying oil based on synchronous fluorometry. A correlation model of synchronous fluorescence peak response and physicochemical indexes of an oil sample is established by utilizing a statistical method. In the correlation model, the relations between the central emission wavelength and carbonyl value, between the central emission wavelength and the polar matter content, between the fluorescence intensity and the carbonyl value and between the fluorescence intensity and the polar matter content are high positive correlations. According to a method the same as that of synchronous fluorescence spectrum measurement in the establishment of the correlation model, the synchronous fluorescence spectrum of the sample of the frying oil to be measured is measured, the sizes of the central emission wavelength and the fluorescence intensity of a pectrogram of the synchronous fluorescence spectrum are compared with the correlation model, the carbonyl value and the polar matter content in the frying oil are analyzed, and the quality of the frying oil is judged. Compared with a conventional method, the method is simple in technology and easy to operate, the frying oil sample can be scanned directly by a computer after sampling, the pretreatment is avoided, and the time for detecting one sample is only several minutes.

The present invention discloses a dynamic modeling method for a suspended liquid filling tank, and belongs to the field of spacecraft dynamics modeling and analysis. The ''shell + beam + concentrated mass point elements'' dynamic modeling method for the suspended liquid filling tank is adopted, a tank section connected with the support boundary is simulated by using the shell element, and other tank section is simulated by using the beam element; and in addition, in order to ensure a relatively large stiffness after pressurization of the actual tank, the multi-point constraint RBE2 is established on the upper and lower end surfaces of the shell element, and according to the method of consistency of the center of mass, the liquid is attached to the beam element in a corresponding position by using the discrete concentrated mass element. Compared with the traditional ''beam element'' and ''shell element'', the method disclosed by the present invention combines the advantages of different elements, so that on one hand, the connection stiffness between the tank and the main structure is not changed, both local modalities and feature point peak response are taken into account at the same time, and the consistency of the obtained modal and dynamic response predictive value and experimental value is better.

An application program and method for determining the strength of electronic products exposed to mechanical shock, including application program steps of (i) describing the mechanical configuration of the electronic product; (ii) describing the stock response; (iii) calculating natural response modes of the circuit card; (iv) calculating stress functions for each component, each response mode; (v) using stress functions to determine modal component stresses at peak response; (vi) removing computer calculation error by comparing the stresses for all components to expectations; (vii) expectations numerically defined by performing equivalent analyses on test experience.

The invention provides a method to detect the peak response wavelength of the infrared quantum well material of gallium arsenide or gallium aluminum arsenide. The invention makes use of a Raman spectrograph to detect the backscattering of the infrared quantum well material to get the Raman scattering spectrogram of the material; and converts the strongest peak value Raman frequency shifting Delta v1 into wavelength, which is the peak response wavelength of the infrared quantum well material. The method provided by the invention has the advantages of saving time and saving labor; simple processing procedure of specimens, and avoiding the complex and fussy processing procedure; that the invention seldom damages the materials and consumes few materials.

The invention provides a method and a device for optimizing the thickness of an absorption layer of a far infrared blocking impurity band detector, and the method comprises the following steps: obtaining parameters of a physical model of the blocking impurity band detector, and constructing a numerical model of the blocking impurity band detector; according to the numerical model, obtaining a curve of change of the response rate R of the blocking impurity band detector along with the incident wave length; changing the thickness of an absorption layer in the numerical model to obtain a corresponding spectral response rate curve, and obtaining a peak wavelength P of the spectral response rate curve; obtaining a functional expression of a curve which fits the change of the peak response rateRP along with the thickness Tabs of the absorption layer under the bias voltage UF of the positive electrode; obtaining a functional expression of a curve which fits and blocks the change of the impurity band detector production cost Cm along with the absorption layer thickness Tabs; and obtaining the optimal absorption layer thickness according to the obtained functional expression. The method has the advantages that the functional expressions of cost performance factors of the detector with respect to different absorption layer thicknesses are obtained through numerical simulation and data fitting, and the optimal absorption layer thickness is extracted according to the functional expressions.

A symbol timing recovery method for DMT-VDSL is disclosed. The method converts the extracted sample to the frequency domain. Using the peaks and the company peaks in the frequency domain, the method determines the correct position of a peak response, thereby calibrating the sample extraction position. Thus, the symbol timing can be recovered.

The invention relates to a vibration isolation device for an electronic product and a design method thereof. The design method includes the steps of firstly determining the static load, stiffness energy capacity and the like of a vibration isolator 1 and a vibration isolator 2 in the principle of the requirement that the center of mass coincides the center line of the stiffness in accordance with the conditions, such as the total mass, the location of the center of mass and the dimension of an electronic device, the space, location, number and mode of the installation of vibration isolators and the peak response frequency of the isolation device; finally selecting vibration isolators of appropriate stiffness to form the vibration isolation device composed of vibration isolators of different stiffness for isolation and buffering for the electronic device. The vibration isolation device for the electronic product can effectively avoid the vibration coupling effect and greatly improve the anti-vibration and anti-shock performance of the electronic device. Therefore, the design technology such as the design method and idea of the vibration isolation device for the electronic product is reasonable and feasible, can be popularized and applied to the field such as other military and civilian products and has good popularization and application prospects.

A high frequency latch comprising a latch and a plurality of buffers coupled to peak load circuitry produces a peak response at a desired frequency of operation as well as isolating each high frequency latch output of a plurality of outputs to substantially reduce the effects of a kickback signal coupled into the latch output. The peaked load circuitry comprises selectable resistive elements and selectable capacitive elements coupled as a high pass filter to change the bias on a saturation region MOSFET configured as an active load. The high pass filter produces positive feedback on the saturation region MOSFET to increase the bias at high frequencies thereby producing an increased response at a desired operating frequency.

A transmit-receive radar system having multiple sub-apertures aligned in an offset, off-centered cross pattern that allows for searching of a sub-aperture pattern for the peak response without having to retransmit beams. The placement of the physical apertures combined with the use of MIMO operations provides a non-uniform distribution of virtual sub-apertures that suppresses ambiguous grading lobes and maintains angle resolution in a manner equivalent to that of non-MIMO approaches. As a result, target detection is enabled within a significantly larger angular area than in a non-MIMO configuration.

The invention discloses a Raman spectrum based online concentration detection method of an L-arginine-alpha-oxoglutarate solution. The method comprises the following steps: 1) preset parameters of a Raman spectrometer are set; 2) a Raman spectrum of a pure solvent is measured and the Raman spectrum is set as the measurement background; 3) the Raman spectrum of a sample to be tested is measured, and spectral data are preprocessed; 4) whether there is a Raman peak within the wave-number range of 990-1030 cm<-1> is judged; if there is no Raman peak, the liquid to be tested contains no L-arginine-alpha-oxoglutarate; if there is a Raman peak, whether there is a Raman peak within the wave-number range of 850-870 cm<-1> is judged; if there is no Raman peak within the wave-number range of 850-870 cm<-1>, the liquid to be tested contains L-arginine-alpha-oxoglutarate; and 5) the correlation between Raman peak response value and concentration is established respectively through an external standard method, and content of L-arginine-alpha-oxoglutarate in the solution is analyzed. The method of the invention has the following advantages: detection time is short; operation is simple and convenient; and real-time analysis of each component to be tested can be realized.