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Huazhong University Of Science And Technology patents


Recent patent applications related to Huazhong University Of Science And Technology. Huazhong University Of Science And Technology is listed as an Agent/Assignee. Note: Huazhong University Of Science And Technology may have other listings under different names/spellings. We're not affiliated with Huazhong University Of Science And Technology, we're just tracking patents.

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "H" | Huazhong University Of Science And Technology-related inventors


Method for enhancing optical signal-to-noise ratio measuring precision by correcting spectral resolution

A method for enhancing optical signal-to-noise ratio measuring precision by correcting spectral resolution is provided, which can obtain optical signal-to-noise ratio with enhanced measuring precision, by measuring actual power of broad spectrum signals in a certain bandwidth, determining the sum of the power of the sampling points for the broad spectrum signals in the bandwidth by using an optical spectrum analyzer, obtaining the corrected resolution of the optical spectrum analyzer, and replacing the setting resolution of the optical spectrum analyzer with the corrected resolution. The method can effectively solve the problem of large osnr measuring error resulted from the difference between the setting resolution and the actual resolution of optical spectrum analyzer. ... Huazhong University Of Science And Technology

Method for compressing and reconstructing data

Disclosed are a method and device for compressing and reconstructing data. The method includes: disposing a transmitting emat array and a receiving emat array; exciting a lamb wave, receiving the lamb wave, subjecting the lamb wave to narrowband filtering with the narrowband frequency, to form detecting data x(n); analysing the detecting data with a dft; reconstructing original detecting data and calculating a reconstruction error according to the measurement vector and the recovery matrix by using a tlbo algorithm; optimizing measurement vector and recovery matrix; transmitting the measurement vector to a supervisory device.. ... Huazhong University Of Science And Technology

Method for connecting graphene and metal compound electrodes in carbon nanotube device through carbon-carbon covalent bonds

A method for connecting graphene and metal compound electrodes in a carbon nanotube device through carbon-carbon covalent bonds, the method including: 1) providing a substrate, designing and preparing pre-patterned metal membrane electrodes on the substrate; 2) mixing carbon nanotubes with a volatile organic solvent to yield a dispersed suspension solution, disposing the carbon nanotube between the pre-patterned metal membrane electrodes in the dispersed suspension to allow two ends of the carbon nanotube to connect to the metal membrane electrodes, to form a carbon nanotube device; 3) annealing the carbon nanotube device under a mixture of nitrogen and argon, etching, by metal atoms, a part of carbon atoms at two ends of the carbon nanotube connected to the metal membrane electrodes to form notches; and 4) using hydrocarbon gas as a carbon source, and performing a chemical vapor deposition process.. . ... Huazhong University Of Science And Technology

Free-falling body verification device for drag-free spacecraft

A free-falling body verification device for a drag-free spacecraft comprises a spacecraft simulation device (1), used for carrying out free-falling body motion on the ground; an inertial sensor or accelerometer (2), used for measuring the residual disturbance acceleration of the spacecraft simulation device (1); an attitude sensor (3), used for measuring attitude parameters of the spacecraft simulation device (1); a drag-free controller (4), used for processing the residual disturbance acceleration and the attitude parameters so as to obtain a feedback control signal; and a propeller (5), used for generating thrust action applied on the spacecraft simulation device (1) under the control of the feedback control signal, so as to enable the spacecraft simulation device (1) to overcome the residual disturbance of the external environment and maintain the attitude. The space operating environment is simulated by means of the free-falling body motion of the spacecraft on the ground within short time; the inertial sensor or accelerometer (2), the attitude sensor (3), the drag-free controller (4), and the propeller (5) are combined, so that the performance and function test verification for a space drag-free aerospace system is realized in the technical ground environment within short time.. ... Huazhong University Of Science And Technology

Thermoelectric cooperative control method for sofc system based on fractional order sliding mode variable structure

The present invention provides a thermoelectric cooperative control method for the sofc system based on fractional order sliding mode variable structure, comprising the following steps: s1, collecting parameters of system states and output under combinations of different input parameters of the sofc system, acquiring an influence function of steady-state power, temperature, efficiency response characteristics and bypass valve opening bp within a full load interval on efficiency optimization, as well as an efficiency optimization function within a specified load switching interval and under a time-delay condition; s2, acquiring a local optimal steady-state operation function, a global optimal function under the steady state developed and formed, and a power tracking function with different switching intervals and different time-delay conditions; s3, calculating a sliding mode interval; s4, calculating a series reaching law function according to optimization functions; s5, eliminating chattering of the series reaching law function through a fractional order optimization method, and solving the reaching law by calculation. The present method can provide precise, flexible and stable control, greatly speed up the switch process, overcome time-delay feature of the great inertia of the sofc system, and realize fast load switching.. ... Huazhong University Of Science And Technology

Light emitting device, optical module and manufacturing method thereof

A light emitting device, an optical module and a manufacturing method thereof are disclosed. According to an example of the disclosure, the light emitting device may comprise an optical waveguide chip, a light emitting chip and a grating between the light emitting chip and the optical waveguide chip. ... Huazhong University Of Science And Technology

Method and system for estimating blur kernel size

A method for estimating a blur kernel size, the method including: (1) pre-processing a blurred image, to obtain an image, so that a size of the image satisfies an image input size of a multi-class convolutional neural network (cnn); (2) inputting the image into a multi-class cnn with completed training, to obtain a blur-kernel-size probability distribution vector; and (3) comparing each element in the blur-kernel-size probability distribution vector, so that an estimated blur kernel size of the blurred image is the blur kernel size corresponding to a largest element. The invention also provides a system for estimating a blur kernel size. ... Huazhong University Of Science And Technology

Combined solar thermal power generation system

The invention belongs to the technical field of solar thermal power generation equipment, and discloses a combined solar thermal power generation system. The system comprises a parabolic trough collector subsystem, a heat exchanger subsystem, a rankine cycle power generation subsystem and a dish power generation subsystem; the parabolic trough collector subsystem comprises a trough-type mirror field, a pump and a valve; the heat exchanger subsystem comprises a superheater, an evaporator and a preheater; the rankine cycle power generation subsystem comprises a temperature-decreased pressure reducer, a steam turbine, an electric generator, a condenser, a condensate pump, a deaerator and a feedwater pump; and the dish power generation subsystem comprises a dish-type mirror field and a stirling engine set. ... Huazhong University Of Science And Technology

Direct current circuit breaker

A direct current circuit breaker, including: n in number circuit breaker modules connected in series, one energy-absorbing and voltage-limiting module connected in parallel to the n in number circuit breaker modules, and a trigger module. The n in number circuit breaker modules each includes a mechanical switch and a commutation branch circuit which are connected in parallel; each commutation branch circuit includes a charging commutation module and a commutation capacitor which are connected in series; the charging commutation module is configured to charge up the commutation capacitor and produce reverse current to cut off the mechanical switch; the one energy-absorbing and voltage-limiting module is configured to absorb energy stored in inductive elements of power systems after a fault current is cut off, so as to limit voltage and protect the mechanical switch, and n is a positive integer greater than or equal to 1.. ... Huazhong University Of Science And Technology

Automatic slicing and collecting device and method for slicing and collecting using the device

An automatic slicing and collecting device, the device including: a first tank, a vibrating microtome, a first pipeline, and a second pipeline. The first tank is filled with a buffer solution. ... Huazhong University Of Science And Technology

A method for evaluating quality of radio frequency signals for stellite navigation system

A method for evaluating the quality of a radio frequency signal for a satellite navigation system, the method comprising: sampling the payload radio frequency signal of a satellite to obtain an intermediate frequency signal, and filtering the signal; downconverting the filtered intermediate signal to obtain the corresponding actual baseband signal; generating the signal components of the ideal baseband signal branches on the basis of the obtained actual baseband signal and the signal system thereof; reproducing the ideal baseband signal, which is used to evaluating the actual baseband signal; establishing a correlation function between the actual baseband signal to be evaluated and the ideal baseband signal, and obtaining through corresponding calculations a series of quality evaluation indexes such as spurious transmission in the band and related loss, thereby enabling the evaluation of the quality of the radio frequency signal. The present invention clarifies the relation between signal quality indexes and the capturing, tracking, and demodulation performance of a signal, and can clearly and regularly evaluate the effect of the signal quality on navigation performance.. ... Huazhong University Of Science And Technology

Method and device for processing magnetostrictive guided wave detection signals

A method for denoising magnetostrictive guided wave detection signals to improve detection accuracy. The method includes forming a matrix a by using the signals; performing a singular value decomposition on the matrix a to obtain a singular matrix b including a plurality of eigenvalues; setting eigenvalues in the singular matrix b that are smaller than the median to zero to obtain a matrix c; performing an inverse transformation of the singular value decomposition on the matrix c to obtain a matrix d; and determining the denoised signals according to the matrix d.. ... Huazhong University Of Science And Technology

Method for generating row transposed architecture based on two-dimensional fft processor

The invention discloses a method for generating a row transposed architecture based on a two-dimensional fft processor, comprising the following characteristic: the fft processor includes an on-chip row transposition memory for storing an image row transposition result. When the size of the row transposition result exceeds the capacity of the on-chip memory, the first 2k data of a row of the two-dimensional array after row transformation is written into the on-chip row transposition memory, the remaining data is written into the off-chip sdram, and k is acquired through calculation according to the row transposition result and the capacity of the on-chip row transposition memory. ... Huazhong University Of Science And Technology

Method for treating male urinary incontinence and a controllable urological clamp

The present application discloses a method for treating male urinary incontinence, which includes the following steps: 1) male urethral reconstruction surgery, 2) preparation of a urethral clamp, and 3) application of the urethral clamp. The urethral clamp and the surgical treatment of male urinary incontinence are low in medical costs, and no artificial material is implanted into the body. ... Huazhong University Of Science And Technology

10/05/17 / #20170289059

Container-based mobile code offloading support system in cloud environment and offloading method thereof

The present invention discloses a container-based mobile code offloading support system in a cloud environment and the offloading method thereof, comprising a front-end processing layer, a runtime layer and a back-end resource layer. The front-end processing layer is responsible for responding to an arrived request and managing a status of a container, which is realized by a request distribution module, a code caching module and a monitoring and scheduling module; the runtime layer provides the same execution environment as that of a terminal, which is realized by a runtime module consisted of a plurality of mobile cloud containers; and the back-end resource layer solves incompatibility of a cloud platform with an mobile terminal environment and provides underlying resource support for a runtime, which is realized by a resource sharing module and an extended kernel module within a host operating system. ... Huazhong University Of Science And Technology

10/05/17 / #20170287558

Memristor-based processor integrating computing and memory and method for using the processor

A processor including a computing and memory structure including x in number integration units and x in number communication units, and a control unit. The integration units are computing and memory units (cmus), each computing and memory unit (cmu) is connected to a corresponding communication unit. ... Huazhong University Of Science And Technology

10/05/17 / #20170284934

Method of sensing aerosol characteristic parameter using dual-wavelength scattered signal and application thereof

The present invention relates to a method of sensing aerosol characteristic parameters using dual-wavelength light scattered signals and the application thereof, and belongs to the technical field of fire warning. The method procedures include measuring the scattered light power of two different wavelengths, calculating the surface area concentration and the volume concentration of aerosol, and obtaining the sauter mean diameter of the aerosol the surface area concentration, the volume concentration and the aerosol sauter mean diameter are compared with corresponding thresholds, and then corresponding fire alarm signals are emitted. ... Huazhong University Of Science And Technology

10/05/17 / #20170284792

Light pattern-based indoor positioning method

A light pattern-based indoor positioning method includes the following steps of: (1) setting a light pattern transmitting device; (2) detecting a light signal of the target to be positioned; and (3) positioning the position of the target to be positioned, to obtain a distance ρ from the target to be positioned to the rotating shaft of the blade, and a deflection angle θ of the target to be positioned relative to the reference line.. . ... Huazhong University Of Science And Technology

09/28/17 / #20170278220

Method and system for correcting aero-optical thermal radiation noise

The invention discloses a method for correcting aero-optical thermal radiation noise, comprising steps of: pretreating a degraded image to obtain a multi-scale degraded image group, conducting iteration process of obtaining an optimal solution by using a last scale estimation result as an original value of next scale estimation according to the multi-scale degraded image group, thereby facilitating original-scale bias field estimation, and restoring the degraded image according to the original-scale bias field estimated value thereby obtaining an image after aero-optical thermal radiation noise correction. The invention also discloses a system for correcting aero-optical thermal radiation noise. ... Huazhong University Of Science And Technology

09/28/17 / #20170277640

Dram/nvm hierarchical heterogeneous memory access method and system with software-hardware cooperative management

The present invention provides a dram/nvm hierarchical heterogeneous memory system with software-hardware cooperative management schemes. In the system, nvm is used as large-capacity main memory, and dram is used as a cache to the nvm. ... Huazhong University Of Science And Technology

09/21/17 / #20170269037

Test method and sensor using magnetostrictively induced guided wave based on open magnetic circuit

Provided is a test sensor using a magnetostrictively induced guided wave based on an open magnetic circuit, comprising an excitation coil, a receiving coil and a magnetic device, the magnetic device comprises multiple test modules circumferentially and uniformly disposed thereon so as to be absorbed to the outer side of a to-be-tested slender component, each test module comprises a housing, a permanent magnet and a magnetic plate, two adjacent housings are connected to each other via an adjusting device, the excitation coil and the receiving coil are disposed in the vicinity of the test module, and are coaxially fit on the outer side of the to-be-tested slender component, the excitation coil operates to generate induced voltage in the receiving coil after the sinusoidal alternating current is input, and a computer can determine whether a defect occurs in the to-be-tested slender component after receiving the induced voltage. The sensor of the invention features simple structure, small size, light weight and convenient installation. ... Huazhong University Of Science And Technology

09/21/17 / #20170267533

Method for preparing three-dimensional porous graphene material

A method for preparing a three-dimensional porous graphene material, including: a) constructing a cad model corresponding to a required three-dimensional porous structure, and designing an external shape and internal structure parameters of the model; b) based on the cad model, preparing a three-dimensional porous metal structure using a metal powder as material; c) heating the three-dimensional porous metal structure and preparing a metal template of the required three-dimensional porous structure; d) placing the metal template in a tube furnace and heating the metal template to a temperature of between 800 and 1000° c.; standing for 0.5-1 hr, introducing a carbon source to the tube furnace for continued reaction, cooling resulting products to room temperature to yield a three-dimensional graphene grown on the metal template; and e) preparing a corrosive solution, and immersing the three-dimensional graphene in the corrosive solution.. . ... Huazhong University Of Science And Technology

09/21/17 / #20170266882

Method for manufacturing composite product from chopped fiber reinforced thermosetting resin by 3d printing

A method for manufacturing a composite product, including: 1) preparing a composite powder including 10-50 v. % of a polymer adhesive and 50-90 v. ... Huazhong University Of Science And Technology

09/07/17 / #20170256905

Distributed feedback laser

A distributed feedback laser, including: an output end including an active region including a grating including a λ/4 phase-shift region; and a non-output end including a reflecting region including a grating with uniform period. The length of the active region is smaller than or equal to 200 μm. ... Huazhong University Of Science And Technology

08/31/17 / #20170246343

Energy-providing bone-repair degradable porous scaffold, preparation method thereof, and application thereof

The invention discloses an energy-providing bone-repair degradable porous scaffold, a preparation method thereof, and an application thereof. The invention obtains an energy-based biomaterial solution by compositing gelatin, a polyatomic acid and derivatives thereof, a dibasic alcohol and derivatives thereof, and a tribasic alcohol and derivatives thereof in a chemical cross-linking manner by using diisocyanate, and further obtains a porous scaffold through a drying method. ... Huazhong University Of Science And Technology

08/17/17 / #20170234987

Method and apparatus for joint data-pilot tracking of navigation signal

A method for joint data-pilot tracking of navigation signal, including: multiplying a digital intermediate frequency signal with a local carrier to accomplish carrier removal; multiplying a signal after the carrier removal with a data baseband signal and a pilot baseband signal respectively to accomplish code removal; processing a signal after the code removal with integration-and-dump to obtain a coherent integration result of each branch; using the coherent integration results to accomplish data-bit flip detection and calculation of probability-weighting factor; acquiring a data-pilot joint carrier tuning-amount, and tuning the carrier numerically controlled oscillator by the carrier tuning-amount to realize data-pilot joint signal carrier tracking; and acquiring a data-pilot joint code tuning-amount, and tuning the code numerically controlled oscillator to realize baseband signal tracking.. . ... Huazhong University Of Science And Technology

08/03/17 / #20170222389

Gas laser

A gas laser, including: a semiconductor laser, an optical beam-shaping system, a pair of electrodes, a discharge tube, a rear mirror, and an output mirror. The pair of electrodes includes two electrodes. ... Huazhong University Of Science And Technology

07/27/17 / #20170214414

Construction method for (n,n(n-1),n-1) permutation group code based on coset partition and codebook generator thereof

A construction method for a (n,n(n−1),n−1) permutation group code based on coset partition is provided. The presented (n,n(n−1),n−1) permutation group code has an error-correcting capability of d−1 and features a strong anti-interference capability for channel interferences comprising multi-frequency interferences and signal fading. ... Huazhong University Of Science And Technology

07/27/17 / #20170213651

Mesoscopic framework for organic-inorganic perovskite based photoelectric conversion device and method for manufacturing the same

The invention discloses a perovskite solar cell and a method of fabrication thereof. The perovskite solar cell sequentially comprises a transparent electrode, a mesoporous p-i-n framework and a counter electrode from the bottom to top; the mesoporous p-i-n framework is composed of an n-type semiconductor layer, an insulating layer, and a p-type semiconductor layer in a sequentially stacked mode, and the n-type semiconductor layer, the insulating layer and the p-type semiconductor layer all comprise mesopores filled with a perovskite material. ... Huazhong University Of Science And Technology

06/15/17 / #20170170660

Operating method of full-bridge modular multilevel converter boosting ac voltages

Provided is an operating method of a full-bridge sub-module (fbsm)-based modular multilevel converter for hvdc transmission with ac-side voltage boosting. The peak value of the ac-side voltage is increased under a constant dc-link voltage by using fbsm's negative output voltage under steady state, wherein keeping the semiconductor's current rating constant during ac-side voltage boosting is in favor of reducing converter cost by decreasing energy interaction between the upper and lower arms in a leg, and further capacitance value of fbsm's capacitor under a constant capacitor voltage ripple, keeping the rms value of ac-side current constant during ac-side voltage boosting can effectively improve transmission capacity of the converter while reducing converter cost, and keeping converter transmission capacity constant during ac-side voltage boosting can reduce rms value of arm currents while reducing converter cost, thereby reducing power loss of fbsms and improving converter efficiency.. ... Huazhong University Of Science And Technology

06/08/17 / #20170163008

Tunable laser and tuning method using the same

A tunable laser, including: a gain section configured to provide an optical gain for lasing; a multi-channel splitter section configured to split an input signal into multiple outputs; and a multi-channel reflection section, the multi-channel reflection section including multiple arms of unequal lengths and configured to provide an optical feedback and a mode selection function for the laser to work. The gain section, the multi-channel splitter section, and the multi-channel reflection section are sequentially connected in that order. ... Huazhong University Of Science And Technology

04/13/17 / #20170100508

Bio-artificial periosteum based on micropatterning of biomimetic mineralized calcium-phosphorus nanoparticles and method for manufacturing the same

The disclosure relates to a bio-artificial periosteum based on micropatterning of biomimetic mineralized calcium-phosphorus nanoparticles and a method for manufacturing the same. The method includes: first, a micropatterned biomimetic mineralized calcium-phosphorus nanoparticle layer is manufactured on a surface of an inert substrate; then, an organic polymer is cross-linked and solidified on the micropatterned biomimetic mineralized calcium-phosphorus nanoparticle layer; at last, the inert substrate is removed, so that the bio-artificial periosteum based on micropatterning of biomimetic mineralized calcium-phosphorus nanoparticles is obtained. ... Huazhong University Of Science And Technology

03/23/17 / #20170082144

Active airbearing device

The present invention discloses an active airbearing device, including a airbearing body, a gas film active adjusting unit, a support body detection unit and a drive control unit, wherein the support body detection device measures a state of airbearing, the drive control system generates a control signal according to a detection signal, drives and controls the gas film active adjusting device to generate an active action, and dynamically adjusts the form of gas films on a airbearing surface, so as to dynamically adjust pressure distribution of gaps between the gas films of the airbearing device, thereby improving dynamic stiffness characteristics of the airbearing. Through the present invention, the dynamic stiffness characteristics of the airbearing can be improved significantly, and the purpose of stabilizing the airbearing is achieved; in addition, the active airbearing device according to the present invention also has the characteristics of a compact structure, convenient operation and control, and high precision, and thus is especially suitable for occasions such as ultra-precision machining or high speed spindle which has high requirements for dynamic stiffness of support.. ... Huazhong University Of Science And Technology

02/16/17 / #20170045879

Numerical control system based on virtual host computer

The invention discloses a numerical control (nc) system based on a virtual host computer, the nc system comprising the virtual host computer arranged on a remote server, a local lower computer and a human-machine interactive device for human-machine interaction. The human-machine interactive device is used for providing a human-machine interactive input/output interface. ... Huazhong University Of Science And Technology

02/16/17 / #20170045107

Single-degree-of-freedom magnetic vibration isolation device

A single-degree-of-freedom magnetic vibration isolation device belongs to vibration isolation devices and solves the following problems: the existing active and passive combined vibration reduction system is complex in structure, needs energy supply, and has low reliability. The present invention includes a metal conductor sleeve, a base, an upper annular permanent magnet, a lower annular permanent magnet, a connecting rod and a center permanent magnet; poles of the upper annular permanent magnet and the lower annular permanent magnet facing to each other have reverse polarity, which are connected to an upper end and a lower end of an inner wall of the metal conductor sleeve respectively; the center permanent magnet is concentrically sleeved on the connecting rod and fixedly connected therewith, and the center permanent magnet is located between the upper annular permanent magnet and the lower annular permanent magnet, and is capable of moving axially together with the connecting rod between the upper annular permanent magnet and the lower annular permanent magnet; and the pole of the center permanent magnet facing to the poles of the upper annular permanent magnet and the lower annular permanent magnet have reverse polarity. ... Huazhong University Of Science And Technology

01/19/17 / #20170017854

Arabic optical character recognition method using hidden markov models and decision trees

Disclosed is an arabic optical character recognition method using hidden markov models and decision trees, comprising: receiving an input image containing arabic text, removing all diacritics from the input image by detecting a bounding box of each diacritic and comparing coordinates thereof to those of a bounding box of a text body, segmenting the input image into four layers, and conducting feature extraction on the segmented four layers, inputting results of feature extraction into a hidden markov model thereby generating hmm models for representing each arabic character, conducting iterative training of the hmm models until an overall likelihood criterion is satisfied, and inputting results of iterative training into a decision tree thereby predicting locations and the classes of the diacritics and producing final recognition results. The invention is capable of facilitating simple recognition of arabic by utilizing writing feature thereof, and meanwhile featuring comparatively high recognition precision.. ... Huazhong University Of Science And Technology

01/12/17 / #20170010215

Method for inhibiting self-absorption effect in laser-induced breakdown spectroscopy

Provided is a method for inhibiting self-absorption effect of a libs, comprising ablating a to-be-measured sample via a pulse laser thereby generating plasma, and selectively stimulating the plasma using a wavelength-tunable laser beam enabling transition of particles in a ground-state in the plasma to high energy state as stimulated absorption, thereby improving a stimulated absorption transition efficiency of the particles in a ground-state, and preventing plasma spectrum from being influenced by self-absorption effect. The invention is capable of eliminating the self-absorption effect without introducing external interference, obtaining original characteristics of emission spectrum from the center of the plasma, and essentially inhibiting and finally eliminating the self-absorption effect of laser plasma by making use of intrinsic physical property of plasma.. ... Huazhong University Of Science And Technology

01/12/17 / #20170008650

Attitude estimation method and system for on-orbit three-dimensional space object under model restraint

An attitude estimation method for an on-orbit three-dimensional space object comprises an offline feature library construction step and an online attitude estimation step. The offline feature library construction step comprises: according to a space object three-dimensional model, acquiring multi-viewpoint characteristic views of the object, and extracting geometrical features therefrom to form a geometrical feature library, where the geometrical features comprise an object main body height-width ratio, an object longitudinal symmetry, an object horizontal symmetry, and an object main-axis inclination angle. ... Huazhong University Of Science And Technology

01/05/17 / #20170003416

Method for infrared imaging detection and positioning of underground tubular facility in plane terrain

The present invention provides a method for infrared imaging detection and positioning of an underground tubular facility in a plane terrain. Demodulation processing is performed on an original infrared image formed after stratum modulation is generated on the underground tubular facility according to an energy diffusion gaussian model of the underground tubular facility, so as to obtain a target image of the underground tubular facility. ... Huazhong University Of Science And Technology








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