223results about How to "Improve detection level" patented technology

Apparatus and methods are provided for the imaging of structures in deep tissue within biological specimens, using spectral imaging to provide highly sensitive detection. By acquiring data that provides a plurality of images of the sample with different spectral weightings, and subsequent spectral analysis, light emission from a target compound is separated from autofluorescence in the sample. With the autofluorescence reduced or eliminated, an improved measurement of the target compound is obtained.

An electronic part for a high frequency power amplifier is provided which is designed to constitute at least a part of a wireless communication system for performing feedback control by detecting an output power, and which can miniaturize a directional coupler. Also, the electronic part permits control of the output power with high accuracy without having any influence on a monitor voltage by a reflected wave propagating through a line of the directional coupler. The directional coupler includes a subline disposed in parallel to and in the vicinity of a part of a main line of an impedance matching circuit on the last output stage side of a power amplifier circuit, a capacitance element connected to between the main line and the subline, and a resistor element connected to between a constant potential point and a termination side of the subline. An output power detection circuit includes a first detection circuit for detecting an alternating current signal taken from a beginning side of the subline, a second detecting circuit for detecting an alternating current signal taken from a termination side of the subline, and a subtracting circuit for performing subtraction between an output of the first detection circuit and an output of the second detection circuit.

A partition partitions off a motor chamber and a pump chamber, through which a cooling water flows, a substantially cylindrical-cup shaped rotor is arranged in the pump chamber, a circuit board is disposed in the motor chamber to be in parallel to an annular-shaped end surface of the rotor, a magnetism detecting element is mounted on that portion of the circuit board, which faces a magnet portion of the rotor, and exothermic electronic parts are mounted on the remaining portion of the circuit board. The magnetism detecting element and the exothermic electronic parts, respectively, are arranged in opposite positions in a substantially annular-shaped area of the circuit board, which faces the annular-shaped end surface of the rotor, and a thickness of an annular-shaped wall portion of the partition facing the annular-shaped end surface of the rotor is made thin in a portion adjacent to the exothermic electronic parts on condition that an annular-shaped surface of the annular-shaped wall portion on a side of the annular-shaped end surface of the rotor is a non-inclined flat surface.

The invention relates to a method for detecting low-molecular-weight heparin by combining ion pair reversed phase chronmatogaphy and mass spectrum. The method comprises the steps of: detecting all compositions of low-molecular-weight heparin by combining ion pair reversed phase chronmatogaphy and high-resolution mass spectrum, separating main compositions from a sample through the ion pair reversed phase chronmatogaphy, obtaining precise molecular weight by the high-resolution mass spectrum, and calculating information of a carbohydrate chain sequence, including structures of two ends, length of a carbohydrate chain and substitution number of ethanoyl and sulfate, thus carrying out fine surface features on the low-molecular-weight heparin. The method has great practical values on improving the heparin detection level and ensuring drug safety.

A communications system includes a modulator for generating a chirp signal aimed at spreading the frequency spectrum of an information signal over a specified spectral bandwidth of a communications channel. The chirp signal has initial and final instantaneous frequency. The chirp signal is controlled from an in-phase control signal and a quadrature-phase control signal to have, in a complex plane, constant amplitude and instantaneous phase. The instantaneous frequency is defined by the speed the instantaneous phase is changed in the complex plane by the in-phase and quadrature-phase control signals; the instantaneous frequency is linearly changed between initial and instantaneous frequencies over the whole duration of the chirp signal; the initial and final instantaneous phases of the chirp signal are identical. The communications system also described an adapted demodulator capable of working even in presence of a significant frequency and/or timing offset between the transmitting and receiving clocking systems.

A neutron detector module comprising a distribution of proportional counters positioned in in a defined array. Each of the proportional counters includes a supply of a neutron sensitive gas for reacting with neutrons, and this reaction generates ionizing reaction products. The proportional counters include a multitude of tubes, and each of the tubes has a diameter between 0.50 inch and 1.00 inch. The neutron detector module comprises further a multitude of electrical conductors; and each of the conductors is positioned in one of the proportional counters, and the ionizing reaction products generate electric current pulses in the electrical conductors.

The invention provides a method for simulating XLPE insulated cable partial discharge and a simulation testing platform, and belongs to the technical field of power cable charged detection. According to the method, five different defect types of an XLPE cable are accurately simulated, and therefore the defect types correspond to partial discharge detection technology effectiveness in a one-to-one mode; the method comprises the specific steps that an atlas database of XLPE cable partial discharge is built at first; then different types of typical defects of the XLPE insulated cable are manufactured manually; the type and degree of the defects are judged according to the features of output signals of the simulation testing platform, and the defect types are made to correspond to partial discharge detection technology effectiveness in the one-to-one mode. The simulation testing platform can simulate five types of typical defects of the cable, and significantly improve the XLPE cable partial discharge fault recognition capability. The method for simulating XLPE insulated cable partial discharge and the simulation testing platform have the advantages of being easy to operate, capable of improving the XLPE cable partial discharge fault recognition capability, wide in application range, safe and reliable.

The invention discloses 384 SNP loci and application thereof in soybean variety resource identification. In the application disclosed by the invention, the physical locations of the 384 SNP loci are determined on the basis of whole genome sequence alignment of the soybean variety of Williams 82, and the version number of a whole genome sequence of the soybean variety of Williams 82 is Glyma.Wm82.al(Gmax1.01); the 384 SNP loci are SMK001-SMK384. An SNP chip based on the 384 SNP loci can be applied to identifying a soybean variety resource; the application of the combination of the 384 SNP loci can greatly improve the detection accuracy, shorten the detection time and improve the detection level, which provides a strong technical support for soybean variety popularization and seed market testing, and accelerates the seed selection process of an excellent new soybean variety.

The invention discloses a two-way multi-order related detection method for a dual-polarization weather radar. The method comprises the following steps: obtaining I/Q (in-phase/quadrature) data of an H (horizontal) channel and a V (vertical) channel; calculating the coherent integration quantities of the H channel and the V channel; calculating the zero-order self-correlation, first-order self-correlation and zero-order cross-correlation quantities of the H channels and the V channels; calculating the weight sum of the multi-order correlation quantity; comparing the weight sum with a threshold value, judging if a weather echo is generated, and if so, calculating the signal-to-noise ratio of the H channel; calculating reflectivity factors under different signal-to-noise ratios; and controlling the quality according to the reflectivity factors, and outputting results. According to the method, the weight sum of the multi-order correlation quantity is introduced in combination with horizontal and vertical polarization echo signals to change a conventional method which simply takes the signal-to-noise ratio of the H channel as a detection factor so as to achieve the purposes of reducing the background noise power and increasing the weak signal detection level, and reduce the loss of the signal-to-noise ratio of an echo wave in a double-transceiver mode.

If a transmission oscillator is incorporated into a communication semiconductor integrated circuit, such as high a frequency IC, constituting a wireless communication system, a problem arises. The accuracy of control of the output power of a power amplifier is degraded. This degradation in accuracy is caused by coupling noise between the output pins of the transmission oscillator and an input pin for detection signals (feedback signals) associated with the output level of the power amplifier or crosstalk. To prevent this, a transmission oscillator of differential output configuration is incorporated into a high frequency IC and an impedance equivalent to the impedance connected with a regular output terminal or a dummy external terminal for outputting transmit signals in opposite phase is provided.

The invention discloses a two-dimension detection system for airport pavement foreign matter. The two-dimension detection system for the airport pavement foreign matter comprises a rotating table and radar, and is characterized by further comprising a radar arm with a length of at least 2 meters. The radar is fixed at one end of the radar arm, and the other end of the radar arm is fixed on the rotating table to enable the radar to rotate with the rotating table. The rotating table is used for bearing the radar to conduct rotation, a stepping angle of each rotation is alpha which is equal to or less than 0.2 degree and each angle stays for a time so that the radar can conveniently emit and receive a radar signal in the position of the angle. The radar adopts a stepped frequency system, radar center frequency adopts 16 gigahertz, signal bandwidth of the emitted signal is 3 gigahertz, and step frequency is 3 megahertz. When the radar rotates with the rotating table by a certain angle, an echo signal from a target area is obtained, then a filtering-back projection algorithm is utilized to dispose the collected total echo signals to obtain target two-dimension information. Due to the technical scheme, limit of a small area is overcome, and two-dimension imaging of a quiet object in the small area can be achieved.

The invention discloses a video measuring device and method by track geometric parameters instead of the chord-line method, comprising a measuring car for track videos, two video cameras, a small measuring car, a dynamic electronic inclinometer, and a computer. Reference marks are made on the measuring car for track videos, and marks to be measured are made on the small measuring car. The measuring method is as follows: two video cameras are respectively used to collect the sequential images of marks to be measured and reference marks; the dynamic electronic inclinometer is used to measure the level dip angles; sub-pixel location is carried respectively on the marks to be measured and the reference marks; according to the sub-pixel coordinate of geometric centers of the marks to be measured and the reference marks and according to the synthetic method of track geometric parameters, height, track direction, track gauge, and level are calculated and results are output at real time. The video measuring device and method has the advantages of thoroughly solving the measurement errors due to looseness of chord-line in the general measurement method, improving the measuring accuracy, facilitating the reconstruction and lowering the cost.

The invention relates to an ion pair antiphase chromatography and mass spectrometry combined detection method for low-molecule heparin part degradation products. All components of the low-molecule heparin part degradation products are detected in a manner of combining ion pair antiphase chromatography and high-resolution mass spectrometer; all the components in a sample are separated through the ion pair antiphase chromatography, and a precise molecule weight is obtained through the high-resolution mass spectrometer, so that sugar chain sequence information, including structures of two ends, lengths of sugar chains and substitution numbers of acetyl and sulfuric acid, of all the components is calculated, so that the structures of the low-molecule heparin part degradation products can be finely represented. The ion pair antiphase chromatography and mass spectrometry combined detection method can detect the structures of the two ends, the lengths of the sugar chains and the substitution numbers of the acetyl and the sulfuric acid of the low-molecule heparin part degradation products; the problem in the prior art that only an ultraviolet absorption atlas for degradation of low-molecule heparin parts can be obtained is solved; the ion pair antiphase chromatography and mass spectrometry combined detection method has a high practicability value in improvement of the detection level of heparin and guarantee of drug safety.

The invention discloses a biosensor based on an aptamer and a manufacturing method and application thereof and belongs to the field of biochemical technique. According to the biosensor based on the aptamer, n-octadecyl mercaptan is automatically assembled on a gold film, the n-octadecyl mercaptan is combined with carboxyl group graphene oxide through intermolecular force, activating treatment is carried out on the carboxyl group graphene oxide to enable carboxyl to be converted into an active ester group, and an amido bond is formed through the active ester group and amino acid on molecule of the aptamer to enable the aptamer to be fixed on the surface of the carboxyl group graphene oxide. According to the biosensor based on the aptamer, the electrochemical activity is good, the aptamer can be well fixed, and the biosensor can be used for detection of various kinds of target protein and can be applied to the fields such as biomedicine, food safety and environmental monitoring. The manufacturing method of the biosensor based on the aptamer is simple and easy to operate. Due to the fact that hydroxyl and epoxy group which are on the graphene oxide are converted into the carboxyl due to the adoption of NaOH and ClCH2COONa, the COOH functional group content is high, the good electrochemical activity is achieved, and the aptamer can be well fixed.

The invention discloses a detection method of detecting Young modulus of an anisotropic material surface layer based on surface acoustic wave. The method comprises the following steps: a short pulse laser beam generated by a pulse laser stimulates a surface acoustic wave signal on the surface of an anisotropic material test specimen, and the surface acoustic wave signal is treated with Fourier transform and data fitting to obtain a dispersion curve of the test specimen in a certain direction; a wave equation of the surface acoustic wave signal in an elastic medium is established in a Cartesian coordinate system, and a Christopher equation is obtained and solved by setting an original parameter condition; a corresponding relation of wave velocity and wave number is established according to the boundary conditions of continuous stress, and a theoretical dispersion curve is obtained through a theoretical relation; the dispersion curve obtained through experiments is compared with the dispersion curve obtained through theoretical calculation to determine the Young modulus of the detected test specimen. The method adopts a laser surface acoustic wave technology to obtain the Young modulus of the anisotropic material surface layer, so that the experiment condition and the measuring steps of an industrial site are simplified, and the test time of engineering materials is shortened.

The invention relates to an XLPE cable insulation pureness evaluation method based on broadband dielectric impedance spectroscopy. The method is suitable for testing the pureness of an ultra-high voltage cable insulating material. The method comprises the steps that an XLPE cable sample is cooled; the XLPE cable sample is heated; cooling and heating are repeatedly carried out to acquire the XLPE sample subjected to repeated cold and heat cycle stimulation processing; and the XLPE cable insulation pureness is determined according to the change rate of the dielectric loss spectrum before and after cold and heat cycle stimulation of the XLPE cable sample. According to the invention, a broadband dielectric impedance spectroscopy test result is directly used to evaluate the XLPE cable insulation pureness; the insulation pureness performance of the XLPE cable can be analyzed; the influence of man-made subjective factors can be avoided; the test result determining method is simple and quick; and the method is of great significance to improve the cable test level, shorten the test time and improve the reliability of the cable power supply.

The invention provides a digital control detecting system of a piezoelectric hemispherical resonant micro-gyroscope. The digital control detecting system comprises a piezoelectric hemispherical resonant micro-gyroscope module, an ADC module, a DAC module, a digital signal processing module and an output or saving module, wherein a charge amplifier module converts a charge signal generated by the piezoelectric hemispherical resonant micro-gyroscope module into an voltage signal; the ADC module converts a received analog signal into a digital signal; the digital signal processing module processes the received digital signal, part of the processing result is displayed or saved, and part of the processing result is output as a feedback signal; the DAC module converts the digital feedback signal into an analog signal so as to feed back to the piezoelectric hemispherical resonant micro-gyroscope module; the piezoelectric hemispherical resonant micro-gyroscope module is excited or driven to produce a detection signal under the given feedback signal. By the digital control detecting system, stable-amplitude and stable-frequency control and digital detection of the piezoelectric hemispherical resonant micro-gyroscope are achieved.