43results about How to "Strong signal to noise ratio" patented technology

The invention provides an amplitude and phase test system of active phased-array radar T/R assemblies, and aims at providing the amplitude and phase test system of high efficiency, reliability and test precision. The N T/R assemblies are connected to antenna directional couplers via two paths of test feed power dividing networks respectively; a frequency synthesizer, a pre-stage power amplifier, a sum and difference device, a sum circuit receiver and a test conversion module are connected between the test feed power dividing networks at the front and tail ends respectively; when test starts, a terminal in the emission T test or reception R test mode emits a test instruction to the frequency synthesizer, the frequency synthesizer outputs test start and test pulse signals, and identical test excitation signals are generated in each beat according to the test pulse; and a wave controller controls different paths of phase shifters on the basis of an orthogonal coding rule, orthogonal phase modules is carried out on the test excitation signals respectively, the modulated signals are input to a signal processor, and amplitude and phase test for all the T/R assemblies is completed.

The invention discloses an amphiphilic lipid-droplet fluorescent probe with super-high selectivity. The amphiphilic lipid-droplet fluorescent probe with super-high selectivity is characterized in that chemical name of the probe is 1-(3'-(7'-nitrobenzofurazan-4'-)aminopropyl)-2,3,3-trimethylindole bromine, NII for short; and the general chemical formula is as shown in the formula (I). The invention also discloses application of the probe in specifically marking or displaying the form and distribution of lipid droplets in living cells or tissues. Experiments confirm that the probe of the invention is a brand-new probe, has a wide range of application, has good single- and two-photon photostability, fast staining speed and low cytotoxicity, can specifically image lipid droplets in living cells and has a wide application prospect.

The invention discloses a cell lipid droplet specific-labeling fluorescent probe. The fluorescent probe has a chemical name of 1-(3'-(7'-nitrobenzofuran-4'-)aminopropyl)-4-methylpyridine bromide and has a general chemical formula shown in the formula (I). The invention also discloses a use of the fluorescent probe in specific labeling or display of a lipid droplet form and distribution in living cells. An experiment result shows that the cell lipid droplet specific-labeling fluorescent probe has the characteristics of very high selectivity, background noise-free imaging, two-photon performances, very good light stability, fast dyeing ability, no use of washing and low cytotoxicity and has a great application prospect.

The invention discloses a system for Young modulus measurement of a film. The system comprises a pulsed laser, wherein the pulsed laser emits pulse laser, which is divided into 7/10 pulse laser and 3/10 pulse laser by a 3:7 spectroscope after being collimated and broadened by a first beam expander, and the 7/10 pulse laser is focused on the surface of a sample under test through a cylinder focusing lens to generate an acoustic surface wave signal under excitation; and the acoustic surface wave signal is converted into an electrical signal through a first detection channel and/or a second detection channel, and the electrical signal is output to a computer for processing after being displayed by an oscillograph. The system not only has the advantages of large signal amplitude, high applicability in testing environment with large disturbance and the like of the piezoelectric laser acoustic surface wave detection technology, but also inherits the advantages of rapid, accurate and non-contact measurement and high signal to noise ratio and the like of the difference confocal laser acoustic surface wave detection technology; and the system has higher applicability and wider range of applicability. Meanwhile, based on the advantage of high measurement bandwidth of the difference confocal laser acoustic surface wave detection technology, the measurement resolution is greatly improved.

The invention provides a shear wave crest value waveform correction method. The method comprises the first step of acquiring an original shear wave time waveform, the second step of searching for a group of displacement points with the maximum shear wave time waveform and a displacement information set corresponding to the displacement points on a time shaft, and the third step of correcting the shear wave crest value waveform through the information set. The invention further provides a corresponding device and system and application of the method, device and system. By means of the method, the accuracy degree and the reliability of correction of the shear wave crest value waveform can be improved.

The invention provides an SPR (Surface Plasmon Resonance) based photonic crystal fiber temperature sensor, which is provided with a liquid core located at the center of an optical fiber and metal coating channels symmetrically distributed around the liquid core in a sensing area, wherein the liquid core can be butted with a conventional single-mode optical fiber to perform long-range detection; dual metal coating channels are adopted, the diameter of air holes between the fiber core and the metal channels is reduced, the sensing strength is effectively enhanced, the signal to noise ratio is higher, and the resonance strength of the sensor can reach up to 327dB/cm; the fiber core and the two metal coating channels are filled with a liquid material with a high thermo-optical coefficient, andthe refractive index of the material is adjusted through adjusting the mixing proportion of the liquid material. The SPR based photonic crystal fiber temperature sensor is high in sensitivity, high in signal to noise ratio, simple in structure and tiny in volume, and specific light source bandwidth and signal strength requirements can be met within a certain range through adjusting the SPR strength and the resonant wavelength.

The invention belongs to the field of brain-computer interface devices, and particularly relates to an animal-emotion electroencephalogram analysis device. The animal-emotion electroencephalogram analysis device comprises an animal electroencephalogram collection module, a preprocessing module, a feature classification module and an analysis-result output module. By means of the animal-emotion electroencephalogram analysis device, eye electrical noise, drifting noise and high-frequency noise in single-electrode original electroencephalogram signals can be removed, and according to feature classification based on machine learning, current-emotion state values of animals are obtained, broadcasted and displayed. Electroencephalogram is collected through a claw-type dry electrode, and can penetrate through hair to be in contact with the cortex, and is combined with the preprocessing module, and it can be guaranteed that the signal to noise ratio is high, and wearing is more convenient; classification is completed through machine learning, and the effectiveness is guaranteed; meanwhile, the time resolution ratio can be increased, and finer emotional state changes can be caught. The animal-emotion electroencephalogram analysis device has the advantages of being fast and convenient to wear and high in sensitivity and accuracy rate, and is suitable for application and popularization.

The invention discloses a display base plate and a manufacturing method of the display base plate as well as a display device. The display base plate comprises a substrate base plate, a patterned black matrix and a touch electrode, wherein the patterned black matrix is arranged on the substrate base plate; in the region of the black matrix, the display base plate comprises a light filtering layer laminating layer located on the black matrix; the light filtering layer laminating layer comprises more than two colored light filtering layers which are stacked in sequence, and is provided with a plurality of openings; the touch electrode is arranged on the light filtering layer laminating layer and covers the surface provided with the plurality of openings. According to the display base plate disclosed by the invention, the light filtering layer laminating layer provided with the plurality of openings is arranged in the region of the black matrix of the display base plate, so that the surface area of the touch electrode, covered by the light filtering layer laminating layer, is enlarged, and more charges can be easily gathered, and furthermore, the touch sensitivity and the touch accuracy are improved.

The invention relates to a diclinic transducer which is used for detecting the defects of a workpiece, belonging to the technical field of ultrasonic probe. The diclinic transducer is provided with a hollow shell with an opening at one end; the opening end of the shell is provided with a wedge block; the shell is internally provided with at least two wafers; the positive surface and the reverse surface of the wafer are respectively connected with a leading wire which is connected with a socket; the two wafers consist of an emitting wafer and a receiving wafer; the emitting wafer and the receiving wafer have an incident angle of 33-70 degrees with the opening end surface of the shell, and the emitting wafer has a deviation angle of 0.3-8 degrees with the receiving wafer; a sound boarding is arranged between the emitting wafer and the receiving wafer; the ultrasonic frequency emitted by the emitting wafer is within 1MHz to 4MHz; the wafer surface is provided with noise elimination material; the area of the wafer is within 6mm*10mm to 15mm*30mm, the flaw detection depth is large and the detection exactness is high.

The invention discloses a method for adjusting signal intensity and equipment. The invention aims to provide a method for adjusting signal intensity and equipment, which can realize the signal intensity adjustment through the matching of automatic gain adjustment and automatic slit adjustment, so that all spectrum sections have higher signal-to-noise ratios. A slit is set at the light spectrum bandwidth position required by a user; the gain adjustment range of an automatic gain adjustment system is set as 1-100; the automatic gain adjustment system is used for detecting the energy value received by a light receiver at present, amplifying the energy value, and transmitting the energy value into an adjustment controller; the adjustment controller is used for judging whether the energy value is lower than or higher than the set threshold value, a control command is outputted to the automatic gain adjustment system to change the overall gain value until the converted energy reaches the threshold value standard; and if the gain value reaches the maximum value, and the converted energy can not reach the threshold value standard, the signal intensity adjustment controller outputs a control command to control a slit servo motor to drive the slit to be opened until the converted energy reaches the thresholds value range.

The invention discloses a space reflecting type optical remote sensor main mirror surface shape aberrance detecting system. The system includes a main mirror, secondary mirrors, a pointolite device, beam-splitters, sampling mirrors and a photoelectric detecting device; wherein, the system is provided with a plurality of the sampling mirrors and the sampling mirrors are all rigidly connected with the main mirror. The invention simultaneously discloses a space reflecting type optical remote sensor main mirror surface shape aberrance detecting method which detects the centroid positions of each facula formed by that the pointolite passes through the beam-splitter, the secondary mirror, the plurality of sampling mirrors, the secondary mirror and the beam-splitter sequentially and is reflected on the detecting device before and after the main mirror surface generates aberrance to acquire the deviation value of the centroid positions of each facula before and after the aberrance of the main mirror surface; the partial slope change of the main mirror at the location of each sampling mirror is calculated according to the deviation value; thereby acquiring the distribution of the main mirror surface shape aberrance. By utilizing the invention, the main mirror surface shape aberrance can be led to have the advantages of few limitations, little energy consumption, high concealment; and the invention can provide enough signal-to-noise ratio, the structure needs detecting is simple and reliable and the detecting process is simple and convenient.

An optical coherence tomography instrument comprises an optical coherence tomography module used for retina scanning for emmetropia eyes and a myopic eye scanning module which can be attached to the outside of the optical coherence tomography module to realize switching of a scanning function for emmetropia eyes and a scanning function for myopic eyes with elongating ocular axes of the optical coherence tomography instrument. The myopic eye scanning module has a negative focal power, so that scanning light beams from the optical coherence tomography instrument are diffused before entering myopic eyes with elongating ocular axes and further the focusing angle of scanning light beams focused on retinas of the myopic eyes with elongating ocular axes is increased and the maximum optical path difference spanned by imaging areas of the retinas is reduced. Thus, error-free mirror image scanning images with stronger scanning signals and higher signal-to-noise ratios can be obtained.

The invention relates to an antibody diluent for enhancing an immune imprinting detection signal. Each 1L of antibody diluent comprises the following components in percentage by weight: 0.25-2.5g of polyvinyl alcohol, 0.25-2.5g of polyvinylpyrrolidone, 0.1-2g of surfactant, 0.015-0.75mL of Kathon preservative and the balance of 0.01-0.1moL/L TBS buffer solution, wherein the pH of the TBS buffer solution is 7.2-7.6. The antibody diluent for enhancing the immune imprinting detection signal can be used for antibody dilution of immune imprinting detection, so that a relatively high background generated by pollution caused by protein is avoided; a relatively strong signal-to-noise ratio is displayed; and meanwhile, the strength and the sensitivity of the immune imprinting signal are enhanced.

The invention discloses a wireless transmitting power prediction control method for reliability demand constraint of an intelligent substation, and the method comprises the steps: constructing a wireless signal propagation state space equation with state observation through the analysis of the relation among reliability, a signal-to-noise ratio and transmitting power and the utilization of a lossmodel and a Kalman filter of wireless signal propagation; performing expected signal-to-noise ratio compensation by estimating a confidence interval of signal-to-noise ratio fluctuation in real time;finally, defining a quadratic cost function taking the difference between the transmitting power and the actual signal-to-noise ratio and the expected signal-to-noise ratio as a target, and realizingoptimal control of the transmitting power through a dynamic programming algorithm. According to the invention, the problem of coordination between the transmitting power of the wireless sensor networkand the wireless communication reliability in the transformer substation environment can be solved, so that the transmitting power of the node is reduced as much as possible while the wireless communication reliability is ensured.

Disclosed herein are novel radiolabeled nucleosides and methods for detecting cellular proliferation in a mammal, the method comprising administrating an effective amount of a radiolabeled nucleoside; the method comprising: a) administering to the mammal a diagnostically effective amount of the nucleoside to the mammal; b) allowing the nucleoside to distribute into the effective tissue; and c) imaging the tissue, wherein an increase in binding of the compound to tissue compared to a normal control level of binding indicates that the mammal is suffering from a disease involving cellular proliferation.

The invention discloses a differential output instrumentation amplifier. The amplifier comprises a first three-operational-amplifier instrumentation amplifier, a second three-operational-amplifier instrumentation amplifier and a gain resistor R0; the first three-operational-amplifier instrumentation amplifier comprises operational amplifiers A1, A2 and A3 and resistors R1, R2, R3, R4, R5 and R11, and the second three-operational-amplifier instrumentation amplifier comprises operational amplifiers A4, A5 and A6 and resistors R6, R7, R8, R9, R10 and R12; and the first three-operational-amplifier instrument amplifier and the second three-operational-amplifier instrument amplifier are in cross connection, an inverting input end of the operational amplifier A1 is connected with an inverting input end of the operational amplifier A5 through the R0, and an inverting input end of the operational amplifier A2 is connected with an inverting input end of the operational amplifier A4. Therefore, the differential output instrument amplifier realizes differential output.