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54 results about "Track disease" patented technology

Systems and methods to identify persons and/or identify and quantify pain, fatigue, mood, and intent with protection of privacy

The disclosed technology enables, among other things, the identification of persons and the characterization of mental perceptions (e.g., pain, fatigue, mood) and / or intent (e.g., to perform an action) for medical, safety, home care, and other purposes. Of significance are applications that require long-term patient monitoring, such as tracking disease progression (e.g., multiple sclerosis), or monitoring treatment or rehabilitation efficacy. Therefore, longitudinal data must be acquired over time for the person's identity and other characteristics (e.g., pain level, usage of a cane). However, conventional methods of person identification (e.g., photography) acquire unnecessary personal information, resulting in privacy concerns. The disclosed technology allows measurements to be performed while protecting privacy and functions with partial or incomplete measurements, making it robust to real-world (noisy, uncontrolled) settings, such as in a person's home (whether living alone or with others).
Owner:ATLAS5D

Subway train operation service quality detection apparatus and method thereof

ActiveCN106960285AAchieving Vibration ComfortAchieving Thermal ComfortResourcesSingle measureEngineering
The invention discloses a subway train operation service quality detection apparatus and a method thereof. The apparatus comprises a detection unit, a detection host and a processing unit, wherein the detection unit includes an inertial measurement module and the detection unit is used for collecting a train body operation attitude parameter, a noise in a carriage, a temperature, humidity, air quality and a mobile phone signal intensity; the detection host is connected to the detection unit in a communication connection mode and is used for acquiring data collected by the detection unit; and the processing unit is connected to the detection host in the communication connection mode, and is used for receiving and storing data transmitted by the detection host, calculating a position parameter of a subway line where the detection apparatus is located according to the data, carrying out single index and integration index evaluation on subway train operation service quality, and carrying out data contrast analysis, data trend analysis, space position analysis, line equipment association analysis and subway line track disease analysis. In the invention, space positioning precision of subway train operation service quality analysis evaluation and objectivity of an analysis result are increased, and a convenient technology means is provided for subway train service quality management and monitoring.
Owner:BEIJING JIAOTONG UNIV

Temporary steel rail supporting device for disassembling and replacing railway ballastless track supporting layers

ActiveCN106049209ALittle impact on drivingQuick remediationRailway track constructionEngineeringTrack disease
The invention relates to the technical field of railway ballastless track disease eliminating, in particular to a temporary steel rail supporting device for disassembling and replacing railway ballastless track supporting layers. The temporary steel rail supporting device comprises steel sleeper beams for supporting temporary passing steel rails and supports fixed on supporting layers below existing rails at the two longitudinal ends of a to-be-constructed area. The steel sleeper beams include two longitudinal beams arranged in the longitudinal direction of the rails and the transverse beams located between the two longitudinal beams, the two ends of the longitudinal beams are laid on the upper end faces of the supports and anchored on the supporting layers below the existing rails at the two longitudinal ends of the to-be-constructed area, the transverse beams are arranged in the transverse direction of the rails, and the two ends of the transverse beams are fixed to the lateral portions of the two longitudinal beams respectively. According to the temporary steel rail supporting device, the steel sleeper beams are used for erecting the construction area overhead and supporting the passing steel rails, a railway line can normally run without stopping, and normal running of the rails is guaranteed; in addition, the disease problem in the supporting layers below the rails and lower structures of the rails can be thoroughly solved, hidden dangers of the rails can be thoroughly eliminated, and high popularization value is achieved.
Owner:CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP

Artificial insemination method of thoroughbred pig

InactiveCN103040541AIncrease profitControl the ratio of male to femaleAnimal reproductionVas deferensBOAR
The invention discloses an artificial insemination method of a thoroughbred pig, comprising the following steps: collecting semen; inspecting, diluting and storing the semen; inseminating semen; inseminating semen secondarily; and the like. In the step of inseminating semen secondarily, a semen inseminating pipe which is larger at the upper part and smaller at the lower part is deeply inserted inside the uterus of a sow, the conception rate is greatly increased, and the proportion of male piglets to female piglets is controlled, so that the productive rate of the sow reaches up to 75%, the utilization rate of high-quality boars is improved, the cultivation cost is reduced, and the propagation of reproductive track diseases is reduced.
Owner:平度市养猪协会

Line temporary overhead device and method for ballastless track disease treatment

PendingCN109183530ASufficient bending stiffnessSufficient lengthRailway track constructionOverhead lineTrack disease
The invention relates to a line temporary overhead device and method for ballastless track disease treatment, belonging to the technical field of railway ballastless track disease elimination. The temporary overhead device comprises a steel cushion beam, a support, a limiting device and a fastener. The longitudinal beam of the steel cushion beam is welded with a steel plate and has a box section.The upper flange of the longitudinal beam is provided with a plurality of fasteners for locking the rail and the longitudinal beam. The two ends of the longitudinal beam are also supported on the railconcrete support layer through bearings respectively. The connection between the longitudinal beam and the support is provided with a finite position device A. The joint of the longitudinal beam, thefirst small cross beam and the last small cross beam is respectively provided with a finite position device B. The line temporary overhead device for ballastless track disease treatment improves theintegrity and construction convenience of the overhead structure, and enables the overhead device to realize the adjustment of the vertical and lateral positions, and a plurality of overhead devices can be connected with each other, and the overhead line can be formed by adopting the combination of a plurality of devices for the lines with a long disease treatment range.
Owner:RAILWAY ENG RES INST CHINA ACADEMY OF RAILWAY SCI +3

Ecological culture method of local chicken

The invention discloses an ecological culture method of local chickens. Full ecological breeding is performed; no antibiotic is remained; the grades of eggs and chicken meat are high; the survival rate of chicks is 99 to 100 percent; the egg laying rate of hens is 72 to 74 percent; 16.7 percent of economic benefits are increased; a chicken brooding house and a local chicken house are inspected and sterilized every day; the safety of the local chickens is ensured; the growth conditions are proper ecological environment; the nutrition and the health are realized; no pollution is caused; the nutrition of the chick feed is comprehensive; the absorption is promoted; the growth is accelerated; the chicken feed is fermented through lactobacilli; the feed fragrance is enhanced; the stomach and intestine functions are promoted; the nutrition absorption is accelerated; the generation of intestine track diseases is prevented, so that the eggs are delicious and tough; the color is bright; the chicken meat is fresh and tender; the chicken brooding house and the local chicken house are cleaned by traditional Chinese medicine sanitizers every day; the breeding of pathogenic microorganisms is inhibited; safety and non-toxicity are realized; the resistance of the local chicken is enhanced; the occurrence of diseases is reduced; the culture cost is reduced.
Owner:王韶华

Assembled sleeper slab type or track slab type ballastless track structure and assembling method

The invention discloses an assembled sleeper slab type or track slab type ballastless track structure and an assembling method. A plurality of prefabricated sleeper slabs or prefabricated track slabsare arranged on a track lower foundation in the longitudinal direction in a spaced manner and correspondingly connected with each other; longitudinal connecting pieces are arranged between the two adjacent slabs; and concrete is poured to the connecting areas so that the track slabs form an assembled integral structure; limiting members can be arranged in the longitudinally connecting areas according to needs; concrete is cast on the limiting members in place so that each sleeper slab and the track lower foundation form an integrated structure; and therefore, the connecting and limiting of each sleeper slab are effectively realized to rapidly form the ballastless track structure. According to the assembled sleeper slab type or track slab type ballastless track structure and the assemblingmethod, the structure is simple; the assembling is simple and convenient; a track can be rapidly maintained or changed when track diseases occur; the connecting and limiting accuracy of the sleeper slabs is high; the reliability is high; the track assembling efficiency is high; the construction period is short; the construction cost is low; the ballastless track construction quality is improved; the service life of the ballastless track is prolonged; material waste is reduced; and very important promotion and application values are realized.
Owner:CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP

Methods, Kits and Reagents for Diagnosing, Alding Diagnosis and/or Monitoring Progression of a Neurological Disorder

The present inventors have identified a panel of biomarkers present in a biological sample of an individual (e.g. blood, including serum or plasma) whose concentrations or levels are altered in individuals with a neurological disorder. Accordingly, changes in the level of any one or more of these biomarkers can be used to assess cognitive function, to diagnose or aid in the diagnosis of a neurological disorder and / or to monitor a neurological disorder in a patient (e.g., tracking disease progression in a patient and / or tracking the effect of medical or surgical therapy in the patient). Changes in the level of any one or more of these biomarkers can also be used to stratify a patient (i.e., sorting an individual with a probable diagnosis of a neurological disorder or diagnosed with a neurological disorder into different classes of the disorder) and diagnosing or aiding in the diagnosis of mild cognitive impairment (MCI) as well as diagnosing or aiding in the diagnosis of cognitive impairment.
Owner:COMMONWEALTH SCI & IND RES ORG

Wearable active rehabilitation training system for finger functions

InactiveCN108786015AActive rehabilitation training is convenientSynchronous and real-time acquisitionGymnastic exercisingData acquisitionEngineering
The invention discloses a wearable active rehabilitation training system for finger functions. The system adopts multi-sensing flexible electronic skin design on the basis of features of fingers of apatient and comprises a finger data acquisition module, a finger data processing module and a finger function training module, active rehabilitation training of the finger functions can be achieved conveniently, and the defects that time and labor are wasted in traditional active rehabilitation training and the training effect is poor are overcome. A multi-sensing flexible electronic technology, aROS operating system and a virtual reality technology are integrated into the finger rehabilitation training process, the patient is guided to complete a task autonomously through a realistic game, and the purpose of active rehabilitation training is achieved. After the game is over, the system displays corresponding scores, and the size of the scores reflect the intensity of the finger functionsand a good or bad training effect. The system can display and save finger movement data in real time, convenience is provided for a trainer and the patient to query and track disease conditions, andthe system is economical, practical, convenient, flexible, high in reliability and suitable for clinical and scientific research.
Owner:ZHENGZHOU UNIV

Railway ballastless track supporting layer and lower structure detaching and replacing method

ActiveCN106192620ALittle impact on drivingQuick remediationRailway track constructionTrack diseaseCushion
The invention relates to the technical field of railway ballastless track disease elimination, in particular to a railway ballastless track supporting layer and lower structure detaching and replacing method. During a skylight point period, cut track plates are removed, and temporary steel tracks are erected on a region to be constructed to be connected with existing tracks; during the skylight point period, the temporary steel tracks are detached, steel cushion beams are erected on the region to be constructed, passing steel tracks are laid on the steel cushion beams to be connected with the existing tracks, and supporting layers below the passing steel tracks are detached; during the skylight point period, concrete is poured below the passing steel tracks to form new supporting layers; and the operation is sequentially cyclically and alternately conducted till all the supporting layers are replaced. By the adoption of the railway ballastless track supporting layer and lower structure detaching and replacing method, the steel cushion beams are used for erecting the region to be constructed up to support the passing steel tracks, normal operation along a railway can be achieved, a shutdown is not needed, and normal operation of the tracks is guaranteed. In addition, disease problems existing in the supporting layers below the tracks and a lower structure can be thoroughly solved, potential track safety hazards are thoroughly eliminated, and the popularization value is extremely large.
Owner:CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP

Method, system and device for detecting hidden diseases of ballastless track

The invention discloses a method for detecting hidden diseases of a ballastless track of a railway. The method comprises the following steps that: a relation set of ballastless tracks of preset disease types and corresponding preset characteristic parameter points is established, wherein the ballastless tracks of the preset disease types are disease tracks containing cavities of different shapes, and the preset characteristic parameter points are characteristic expressions of geomagnetic signals; geomagnetic field signals of a to-be-detected ballastless track are collected through a signal collecting device, and characteristic extraction is performed to obtain to-be-detected characteristic parameter points; and the relation between the to-be-detected characteristic parameter points and the preset characteristic parameter points in the relation set by adopting a preset identification model so as to judge the disease type and the corresponding position of the ballastless track of the railway; the hidden disease maintenance level of the ballastless track is diagnosed on the basis of the structural characteristics and maintenance regulations of the detected track; and imaging processing is performed according to the corresponding relation set of the to-be-detected characteristic parameter points and the ballastless track disease types, and disease characteristics are labeled. The invention further provides a corresponding system and device.
Owner:TONGJI UNIV

Modified bituminous concrete with self-regulating temperature function

The invention provides modified bituminous concrete with a self-regulating temperature function. The modified bituminous concrete is prepared from the following raw materials in parts by weight: 100 parts of mineral aggregate, 3-7 parts of asphalt, 0.2-2.4 parts of sepiolite powder, 0.1-2.0 parts of palygorskite powder, and 0.01-0.06 part of coupling agent, wherein the coupling agent is a titanate coupling agent or an aluminate coupling agent; the aggregate grading type of the mineral aggregate is AM-13, GAC-13, AC-13, SMA-13 or OGFC-13. According to the modified bituminous concrete provided by the invention, excellent characteristics of sepiolite and palygorskite are reasonably utilized; the usability of a bituminous concrete pavement can be effectively improved; the temperature of the bituminous concrete pavement can be reduced under a high-temperature condition; a track disease is reduced; the bituminous concrete pavement can keep high temperature to resist a low-temperature disease under a low-temperature condition.
Owner:CHANGAN UNIV

Ballast track disease automatic detection and recognition method

The invention provides a ballast track disease automatic detection and recognition method, and relates to the technical field of railway disease detection. A sliding time window is designed, the size of the window is 512*512, and the step length of the window is 512 trace. Hyperbola asymptote direction features in the time window are respectively extracted by means of the statistical domain energy feature extraction method, and whether diseases exist in the window or not is judged, recognized and recorded according to Euclidean distance space. The sliding window is moved to judge, recognize and record whether diseases exist in a next window or not, the steps are sequentially repeated, and ballast track disease automatic detection and recognition are achieved. The ballast track disease automatic detection method is implemented, manpower cost is greatly reduced, the detection efficiency is improved, and the practicality is very high.
Owner:SHIJIAZHUANG TIEDAO UNIV

Detection method of rail slab disease based on significance analysis

ActiveCN109064444AHighlight disease characteristicsTo achieve the effect of disease detectionImage enhancementImage analysisSaliency mapClassification methods
The invention discloses a track board disease detection method based on saliency analysis, which mainly comprises: (1) pre-processing the video by illumination, and extracting the spatial saliency ofthe vehicle-mounted video by fusing color, brightness and direction features. (2) on the one hand, sparse sampling being done to track video during the monitoring period, comparing the current monitoring video frame with the corresponding sampled video frame, and selecting the video frame with large variation as the reliable frame. On the other hand, a track video frame with abrupt change characteristics relative to the upper and lower frames is selected as a reliable frame. (3) Rough spatio-temporal salience map is obtained by fusing spatial salience map and temporal salience map. Consideringbackground prior, center prior and spatial compactness, the improved spatio-temporal saliency map is obtained for rough saliency map. (4) Significant weights of track diseases are obtained accordingto the saliency map, and the semi-supervised classification method based on saliency weighted model is used to identify and classify track diseases of high-speed railway. The invention can detect thetrack disease in real time.
Owner:SOUTHEAST UNIV

Mobile loading device for track disease identification

The invention provides a mobile loading device for track disease identification. The mobile loading device comprises a loading mechanism, a sensor, a controller, a power supply, a power driving deviceand a chassis, wherein the loading mechanism is provided with a loading motor and a loading force hammer and loads excitation to a rail, a force sensing head is arranged at the end portion of the loading force hammer and is used for feeding back force hammer loading data to the controller, the sensor is in circuit connection with the controller and obtains response information fed back by the excited rail, and the chassis is used for bearing the loading mechanism, the sensor, the controller, the power supply and the power driving device, and is provided with walking wheels in driving connection with the power driving device. The mobile loading device provided by the invention can overcome the instability caused by artificial experience and personal operation habit influence in the prior art, the external illumination condition and dirt on the surface of the to-be-detected structure cannot influence the judgment of the detection result, some hidden diseases which cannot be found by a visual detection method can be detected, hidden dangers can be found as soon as possible, and existing structural safety problems are eliminated in time.
Owner:BEIJING JIAOTONG UNIV

Asphalt pavement heat-reflecting coating and preparation method thereof

The invention discloses an asphalt pavement heat-reflecting coating and a preparation method thereof. The asphalt pavement heat-reflecting coating includes first water-borne epoxy resin, second water-borne epoxy resin, nanometer titania, nanosilicon dioxide, iron oxide red, a flatting agent, a dispersant and an anti-skid agent. Compared with traditional asphalt pavement heat-reflecting coatings, the asphalt pavement heat-reflecting coating has higher strength, adhesive capacity and durability, thus the asphalt pavement heat-reflecting coating can be applied to asphalt pavements of urban road intersections to resist the impact effect of the vehicle load, the pavement temperature in summer can be effectively lowered, track diseases are reduced, and thus the service lives of the asphalt pavements are prolonged; and by controlling the coating thicknesses with different asphalt pavement gradation types to reduce decreasement of the coating on an original pavement pore structure, meanwhile,a microcosmic anti-skid structure is provided by spreading the anti-skid agent, the anti-skid performance is good, and thus the traffic safety is ensured.
Owner:上海南信公路建设有限公司

Repairing method for serious track groove on municipal road

InactiveCN102864715AImproves rutting resistanceDelay the rate of relapseIn situ pavingsEngineeringRoad surface
The invention discloses a repairing method for a serious track groove on a municipal road. The method includes heating and spiking up a road with a serious track disease, and controlling a spiking up depth at a track trough to be 1-2cm; filling a mixture with a large particle diameter at the track position with a filling height 1-3cm higher than other positions of the road on the same cross section, wherein the mixture with a large particle diameter is the AC-20 or AC-25 type bituminous mixture; rolling the road; and paving new bituminous mixture and rolling the road. According to the method, on one hand, the compaction of traffic vehicle load on the track position is used sufficiently, on the other hand, the anti-track capacity of the track position is improved due to filling of the mixture with the large particle diameter at the track during construction, and recurring rate of the track is delayed.
Owner:YINGDA HEAT REGENERATION

Railway track disease detection system and a detection method thereof

The invention discloses a railway track disease detection system, comprising a handheld terminal and a background server. The handheld terminal is used for receiving the detection instruction sent bythe background server and uploading the railway track diseases detected by the detection personnel to the background server. The background server calculates, compares and analyzes the data of railwaytrack diseases uploaded by the handheld terminal through the computer to find out whether the maintenance personnel are needed to deal with the railway track diseases. If the maintenance personnel are needed to maintain the railway track diseases, the maintenance information is sent to the maintenance personnel. Through the railway track disease detection system, the invention can timely and accurately feeds back the railway track disease to the background server, thereby avoiding the occurrence of false report, omission report and false report.
Owner:襄阳联杰机电有限公司

A temporary rail support device for the removal and replacement of the support layer of railway ballastless track

ActiveCN106049209BLittle impact on drivingQuick remediationRailway track constructionTrack diseaseRailway line
The invention relates to the technical field of railway ballastless track disease eliminating, in particular to a temporary steel rail supporting device for disassembling and replacing railway ballastless track supporting layers. The temporary steel rail supporting device comprises steel sleeper beams for supporting temporary passing steel rails and supports fixed on supporting layers below existing rails at the two longitudinal ends of a to-be-constructed area. The steel sleeper beams include two longitudinal beams arranged in the longitudinal direction of the rails and the transverse beams located between the two longitudinal beams, the two ends of the longitudinal beams are laid on the upper end faces of the supports and anchored on the supporting layers below the existing rails at the two longitudinal ends of the to-be-constructed area, the transverse beams are arranged in the transverse direction of the rails, and the two ends of the transverse beams are fixed to the lateral portions of the two longitudinal beams respectively. According to the temporary steel rail supporting device, the steel sleeper beams are used for erecting the construction area overhead and supporting the passing steel rails, a railway line can normally run without stopping, and normal running of the rails is guaranteed; in addition, the disease problem in the supporting layers below the rails and lower structures of the rails can be thoroughly solved, hidden dangers of the rails can be thoroughly eliminated, and high popularization value is achieved.
Owner:CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP

Railway bridge section track disease monitoring method and system based on combination of grating array and video monitoring

The invention relates to a railway bridge section track disease monitoring method and system based on combination of a grating array and video monitoring, and the method comprises the steps: arranging a fiber grating array optical cable on a track structure, carrying out the real-time collection of track state monitoring data, and transmitting the data to a background server through a fiber grating demodulator; a plurality of video cameras are installed along the whole track at intervals, and the video cameras send shot video monitoring data to a background server through video data receiving equipment; the background server judges whether the track state monitoring data collected by each measuring point is abnormal or not, if the track state monitoring data collected by a certain measuring point is abnormal, it is indicated that the possibility that the track structure has diseases exists in the area corresponding to the measuring point, and then the video monitoring data of the area is called for display; and a supervisor is assisted to identify the specific type of the disease. According to the invention, real-time monitoring and type identification of the railway track structure disease condition are realized, and the disease type is visually reflected through a video.
Owner:CHINA RAILWAY SIYUAN SURVEY & DESIGN GRP +1

Ballastless track disease detection method and system based on vehicle-mounted acoustic sensing

The invention relates to a ballastless track disease detection method based on vehicle-mounted acoustic sensing. The ballastless track disease detection method specifically comprises the following steps of S1, collecting original sound signals in the train running process; S2, according to the original sound signal, enhancing a ballastless track structure sound radiation signal in the original sound signal; s3, according to the enhanced sound radiation signal of the ballastless track structure, identifying a corresponding track disease, and obtaining a disease identification result of the ballastless track; and S4, according to the disease identification result of the ballastless track, judging a line section needing to be maintained. Compared with the prior art, the method has the advantages of saving labor, equipment and time cost, improving the detection efficiency of the ballastless track and the like.
Owner:TONGJI UNIV

Systems and methods to identify persons and/or identify and quantify pain, fatigue, mood, and intent with protection of privacy

ActiveUS11017901B2Accurate identificationRemoves dependency and associated disadvantageMedical data miningDiagnostic signal processingIdentity recognitionMood
The disclosed technology enables, among other things, the identification of persons and the characterization of mental perceptions (e.g., pain, fatigue, mood) and / or intent (e.g., to perform an action) for medical, safety, home care, and other purposes. Of significance are applications that require long-term patient monitoring, such as tracking disease progression (e.g., multiple sclerosis), or monitoring treatment or rehabilitation efficacy. Therefore, longitudinal data must be acquired over time for the person's identity and other characteristics (e.g., pain level, usage of a cane). However, conventional methods of person identification (e.g., photography) acquire unnecessary personal information, resulting in privacy concerns. The disclosed technology allows measurements to be performed while protecting privacy and functions with partial or incomplete measurements, making it robust to real-world (noisy, uncontrolled) settings, such as in a person's home (whether living alone or with others).
Owner:ATLAS5D

Disease evolution tracking and disease condition prompting method and device and electronic equipment

The embodiment of the invention provides a disease evolution tracking and disease condition prompting method and device and electronic equipment. The method comprises the steps: determining a to-be-tracked disease; and determining disease evolution information of the to-be-tracked disease based on the symptom information of the to-be-tracked disease and the symptom information of a plurality of candidate evolution diseases of the to-be-tracked disease. According to the method, the device and the electronic equipment provided by the embodiment of the invention, disease evolution tracking is carried out by combining the symptom information of the to-be-tracked disease and the candidate evolution disease, so that the internal relation between the diseases can be deeply analyzed from the medical perspective so as to improve the reliability and the accuracy of disease evolution tracking.
Owner:讯飞医疗科技股份有限公司

Cloned weakening strain of chicken virus mycoplasma

The strain is a hypotoxic strain with immunogen formed by S6 strain and through thrice solid cloning, then acellular culture and weakening to over 168 generation. The strain is safe, without restoring its strong toxicity, easy to test, and has relatively strong immunogen for preventing chicken's chronic respiratory track disease. The strain is preserved in Common Microbe Center of Chinese Microbial Vaccine Storing and Management Commission with the stroing number being CGMCC No.0397.
Owner:江苏省农业科学院畜牧兽医研究所

A method for automatic detection and identification of ballasted track defects

The invention provides an automatic detection and identification method for ballasted track defects, relates to the technical field of railway defect detection, and designs a sliding time window with a window size of 512×512 and a window step size of 512trace. The hyperbolic asymptote direction features in the time window are extracted by using the energy feature extraction method of the statistical domain, and whether there is a disease in the window is judged, identified and recorded according to the Euclidean distance space. Move the sliding window, judge, identify and record whether there is a disease in the next window, and cycle in turn to realize the automatic detection and identification of ballasted track diseases. The method realizes an automatic detection method for ballasted track defects, greatly reduces labor costs, improves detection efficiency, and has strong practicability.
Owner:SHIJIAZHUANG TIEDAO UNIV
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