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156results about How to "Good buff" patented technology

SAR remote-sensing image oil spilling detection and identification method

The invention provides an SAR remote-sensing image oil spilling detection and identification method, which has the concrete process comprising the following steps of utilizing a Gamma MAP filter to filter an SAR image, and filtering Sobel; carrying out a watershed algorithm on a gradient map obtained through filtering Sobel to realize sea and land division; utilizing a mean value of a sea surface area image to fill a land area, and then utilizing a C-V algorithm to carry out target area division and extraction in the same homogeneous area on the filled image; extracting a gray-level co-occurrence matrix, the texture property of wavelet decomposition, the gray-level feature and the shape feature of a target area to build a vision frequency histogram; utilizing an SVM classifier model obtained through training to classify the vision frequency histogram, removing a suspected oil spilling area from the target area, and realizing initial false-alarm removal; adopting a result of false-alarm removal as an initial labeling field; utilizing a characteristic field in a context model of MRF to carry out further false-alarm removal based on the initial labeling field, so that the SAR remote-sensing image oil spilling detection and identification method is realized.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY

Two-dimensional transition metal sulfide gas sensor based on antenna structure, and preparation thereof

ActiveCN109580725AAdsorption/desorption temperature is lowAddress adverse effects of transport propertiesMaterial resistanceDiffusionElectrical resistance and conductance
The invention discloses a two-dimensional transition metal sulfide gas sensor based on an antenna structure, and preparation thereof. The gas sensor comprises a two-dimensional transition metal sulfide TMDCs film which is patterned into two connected parts of a conductive channel and an antenna structure, wherein the surface of the conductive channel is covered with a passivation layer; the antenna structure is used for adsorbing the gas to be tested as a gas sensitive layer; when molecules of the gas to be tested are adsorbed on the surface of the antenna structure and are performed with charge transfer, the concentration of carriers in the antenna structure changes to form a concentration gradient and induce the diffusion of the carriers, so that the concentration of the carriers in theconductive channel changes, and finally the resistance of the conductive channel is changed, thereby realizing the sensing of the gas to be tested by the gas sensor. The sensor, by distinguishing thegas sensitive layer and the conductive channel into two parts on the sensor structure, not only helps to increase the stability of the sensor, but also can improve the sensitivity of the gas sensor byutilizing the gain effect of the antenna structure.
Owner:HUAZHONG UNIV OF SCI & TECH +1

Heat pipe generator air-cooling cooling device

The invention relates to a heat pipe generator air-cooling cooling device which comprises a generator, and the generator comprises a stator, a rotator and a rotating shaft; the innovation point is in that: the generator also comprises a fan, a heat exchanger assembly, a wind guide cover and a cooling assembly, the cooling assembly is arranged on the periphery of the stator of the generator, the outlet of the fan is communicated with one end of the heat exchanger assembly, and the wind guide cover is communicated with the other end of the heat exchanger assembly; the heat exchanger assembly comprises a heat exchanger shell and condenser pipes, a plurality of condenser pipes are arranged in the heat exchanger shell, and the condenser pipe has a liquid inlet and a liquid outlet; the cooling assembly comprises a cooling shell and evaporating pipes, a plurality of evaporating pipes are arranged in the cooling shell, and the cooling shell is fixedly connected with the periphery of the stator of the generator; and the liquid outlets of the condenser pipes of the heat exchanger assembly are respectively communicated with corresponding evaporating pipes in the cooling shell. According to the invention, the device provided by the invention has advantages of simple structure, high cooling efficiency and low energy consumption.
Owner:常州优谷新能源科技股份有限公司

Organic-inorganic composite erbium doping flat optical waveguide amplifier and preparing method thereof

The invention relates to a strip-shaped optical waveguide amplifier by adopting a novel organic polymer material as an optical waveguide envelope, and adopting an organic-inorganic hybrid material doped with LaF3: Er, Yb nano-particles which are modified by an oleic acid surface as a sandwich layer, as well as the preparation method thereof. The optical waveguide amplifier is composed of a silicon substrate, a lower envelope, the sandwich layer and an upper envelope, wherein the lower envelope and the upper envelope adopt the novel organic polymer material; the sandwich layer adopts the organic-inorganic hybrid material doped with the LaF3:Er, Yb nano-particles which are modified by the oleic acid surface; the refractive index of the sandwich layer is larger than the refractive index of the lower envelope and the upper envelope; a plurality of strip-shaped waveguide grooves are formed on the lower envelope; the strip-shaped waveguide grooves are filled with the organic-inorganic composite materials of the sandwich layer, so as to form a buried structure. The method for making the optical waveguide amplifier is simple; the refractive index difference between the polymer sandwich layer and the envelope material is easy to control; and the thickness of each layer of material is easy to control. The optical waveguide amplifier has the advantages of low cost, good gain performance and high yield, and is suitable for mass production.
Owner:JILIN UNIV

B1/L1 broadband satellite antenna based on T-shaped balance load of L-shaped slot

The invention provides a B1 / L1 broadband satellite antenna based on T-shaped balance load of an L-shaped slot, and relates to a broadband satellite antenna. The broadband satellite antenna is provided with a dielectric substrate; good conductor layers are laid on the upper surface and the lower surface of the dielectric substrate respectively; the good conductor layer on the upper surface is provided with two L-shaped slot-loaded circular radiation patches; a feed structure is arranged on the good conductor layer on the lower surface and is a split power division network; and the lengths of microstrip lines of a power divider are 3-4.5mm, the quarter impedance conversion length is L2+L3+pi*D1 / 2 and a difference of a quarter wavelength exists in the length of a feeder to achieve a 90-degree phase shift by an output end, wherein L2 and L3 are the lengths of the microstrip lines and D1 is the width of the feeder. The good conductor layer on the upper surface is a metal ground plane. According to the B1 / L1 broadband satellite antenna based on T-shaped balance load of the L-shaped slot, the miniaturization characteristic can be achieved, the gain performance is relatively good and horizontal omnidirectional radiation can be achieved.
Owner:XIAMEN UNIV

Target detection method, system and device for remote sensing image and medium

The invention discloses a target detection method, system and device for a remote sensing image and a medium, and the method comprises the following steps: obtaining a to-be-detected picture, carrying out the feature extraction of the to-be-detected picture, and obtaining a feature map with a detection frame; inputting the feature map into a two-stage cascaded detection network, and obtaining direction sensitive features of the feature map in a first-stage detection structure by adopting multi-direction RoI Align, so that the detection frame has angle parameters; and in the second-stage detection structure, adopting a multi-branch deformation convolution module to carry out alignment processing on the feature map, obtaining a final detection frame, and achieving target detection. The method, system and device do not need to generate extra candidate boxes in various orientations in a region extraction network stage, but extract features in multiple different directions, the calculated amount is relatively not increased, the obtained direction sensitive features have a good gain effect on regression branches, the overall performance of the model is improved, the method, system and device can be widely applied to the technical field of image processing.
Owner:SOUTH CHINA UNIV OF TECH

Direct-conversion radio frequency receiving front-end circuit device

ActiveCN105680889AImprove performanceIncreased degrees of freedom for optimizationTransmissionLoad circuitIntermediate frequency
The embodiment of the invention provides a direct-conversion radio frequency receiving front-end circuit device. The device comprises a driving stage circuit, a switch pair circuit and a load circuit; the driving stage circuit converts a small signal voltage vRF into small signal current iRF, and folds the small signal current iRF to make the small signal current iRFflow into a source electrode of a PMOS tube in the switch pair circuit through an NMOS tube; the switch pair circuit carries out frequency conversion processing on the small signal current iRF through the PMOS tube to obtain medium frequency small signal current and transmits the medium frequency small signal current to the load circuit; and the load circuit converts the medium frequency small signal current into a medium frequency small signal voltage and outputs the medium frequency small signal voltage. The direct-conversion radio frequency receiving front-end circuit device provided by the embodiment of the invention reduces the noise in a similar current injection mode to improve the overall performance of the circuit. A folded structure is employed to increase an additional branch from the power supply to the ground, in other words, the optimization degree of freedom of bias current is correspondingly increased. The bias current of a switch pair is reduced to improve the flicker noise performance, and meanwhile, the direct-conversion radio frequency receiving front-end circuit device has excellent gain performance.
Owner:AEROSPACE INFORMATION

One-emission-two-receiving circularly-polarized integrated antenna

The invention discloses a one-emission-two-receiving circularly-polarized integrated antenna. The one-emission-two-receiving circularly-polarized integrated antenna comprises a circularly-polarized patch antenna unit and a printed circuit board, wherein the circularly-polarized patch antenna unit and a feeding structure are integrated onto the printed circuit board, the circularly-polarized patchantenna comprises a microstrip plate, an antenna radiator and a metal post probe, the antenna radiator is arranged on an upper surface of the microstrip plate, the metal post probe vertically penetrates through the microstrip plate and the printed circuit board, two ends of the metal post probe are respectively connected with the antenna radiator on the upper surface of the microstrip plate and amicrostrip line on a lower surface of the printed circuit board, and a plurality of electromagnetic bandgap structure units are arranged at an outer side of the antenna radiator and are annularly distributed. By the one-emission-two-receiving circularly-polarized integrated antenna, the isolation between the antenna units can be effectively, the directional diagram, the shaft ratio and the gain performance of the antenna units are improved, and the integration of the antenna and a circuit and a component on the printed circuit board is facilitated.
Owner:CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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