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Vibration response and safety co.trol for blasting vibration of the existing tunnel with defects

Underground Space 2024年第2期15卷 76-89页

作者： Junying Xia Bo Wang Xinxin Guo Zhuoxiong Xie Key Laboratory of Transportation Tunnel Engineering Ministry of EducationSouthwest Jiaotong UniversityChengdu 610031China co.lege of Environment and Civil Engineering Chengdu University of TechnologyChengdu 610059China guangdong communication planning&design institute group co. LtdGuangzhou 510507China

Current studies on blasting co.struction of small clear-distance tunnels have not co.sidered the impact of existing tunnel lining defects when establishing safety *** paper offers a series of study results based on the blasting project of a new tunnel adjacent to the existing defect Xinling tunnel to thoroughly examine the dynamic response,safety co.trol standards,and measures of the existing defect ***,structural models were developed to investigate the influence of the presence or absence of specific defects(like lining cracks and cavities behind the lining)on the dynamic response of the current tunnel lining to identify the most unfavorable defect ***,establish safety co.trol standards for intact linings and those with the most unfavorable ***,two types of co.trol measures,single safe charge and reasonable delay time,were studied based on the established safety co.trol *** particular,the most adverse position of cracks was the wall facing the explosion,the rise in depth was more unfavorable for vibration response,and the impact of the longitudinal crack was restricted to the vicinity of the *** the vault was the most adverse cavity position,the rise in cavity area was more damaging,and the influence range varied with longitudinal cavity ***,the impact of cracks was mainly evident in the amplification effect of stress at the crack *** co.trast,cavities had varied degrees of amplification effects on the vibration velocity and stress response and a relatively extensive influence *** co.trol research was co.ducted,when the tunnel was intact,with a right wall crack,a vault cavity,and both vault cavity and crack for this project,the peak particle velocity(PPV)of the safety co.trol standard for vibration velocity was 13,10,13,and 8 cm/s,respectively,and the respective single safe charge co.ld be adjusted at 64,53,37,and 25 ***,the presence of different defects had a relati

关键词： Existing tunnel Defect Blasting co.struction Vibration response co.trol standards and measures

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Assessing impact of intermittent window opening strategies on pathogen-laden droplet dispersion in a co.ch bus

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Building Simulation 2024年第7期17卷 1183-1200页

作者： Qiqi Luo Xingdong Deng Jian Hang Cuiyun Ou Zhiwen Luo Xiaodan Fan Xia Yang Yifei Zhang Zhongli Gu Xuelin Zhang School of Atmospheric Sciences Sun Yat-sen Universityand Southern Marine Science and Engineering Guangdong LaboratoryZhuhai 519082China Key Laboratory of Urban Meteorology China Meteorological AdministrationBeijing 100089China China Meteorological Administration Xiong'an Atmospheric Boundary Layer Key Laboratory Xiong'anChina Guangzhou Urban planning&design Survey Research institute Guangzhou 510060China Guangzhou co.laborative Innovation Center of Natural Resources planning and Marine Technology Guangzhou 510060China guangdong Enterprise Key Laboratory for Urban Sensing Monitoring and Early WarningGuangzhou 510060China Welsh Schoolof Architecture Cardiff UniversityUK guangdong Province Engineering Laboratory for Air Pollution co.trol South China Institute of Environmental Sciencesthe Ministry of Ecology and Environment of ChinaNo.7 West Street YuancunGuangzhou 510655China guangdong Fans-tech Agro co. LtdGuangdong ProvinceChina

Opening windows in co.ch buses is a practical approach to improving natural ventilation and mitigating infection risk(IR).Due to human behavior and weather co.ditions,the intermittent window opening strategy(IWOS)is a more co.mon practice than keeping windows co.stantly *** its prevalence,there are no studies exploring IWOS specifically in *** employed indoor-outdoor co.pled CFD simulations to assess the effects of various IWOS on pathogen-laden droplet(PLD)dispersion and IR in a co.ch bus that occurred a co.ID-19 outbreak in Hunan,*** reveal that after ventilating through two skylights for 600–1800 s,opening front and rear windows(FW+RW)or FW with a wind catcher(FW+WCH)for just 40 s can reduce PLD co.centration(Cave)to 5%of its initial level and the intake fraction of the infector’s neighbor(IFn)drops by 95%.Upon closing FW+RW or FW+WCH,Cave and IFn take over 580 s to return to the pre-opening ***,intermittent FW opening halves Cave and IFn within 7 min,but leads to rapid increases upon window ***,opening FW+RW and FW+WCH intermittently have pronounced impacts on indoor PLD co.centration and are applicable approaches to co.trol respiratory disease transmission in *** to the inhaled viral dose,it is reco.mended to open windows when driving time is over 12 minutes to reduce infection *** scenarios like epidemiological surveys and risk assessments,where assessing passenger infection risk is vital,some behaviors of opening windows cannot be overlooked and necessitate extra attention.

关键词： infection risk co.putational fluid dynamics air change rate per hour natural ventilation wind catcher tracer gas dispersion

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Large‑scale transcriptomic and genomic analyses reveal a novel functional gene SERPINB6 for chicken carcass traits

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Journal of Animal Science and Biotechnology 2024年第4期15卷 1466-1481页

作者： Di Zhao Ranran Liu Xiaodong Tan Huimin Kang Jie Wang Zheng Ma Haiquan Zhao Hai Xiang Zhengfen Zhang Hua Li Guiping Zhao guangdong Provincial Key Laboratory of Animal Molecular design and Precise Breeding School of Life Science and EngineeringFoshan UniversityFoshanChina State Key Laboratory of Animal Biotech Breeding Institute of Animal SciencesChinese Academy of Agricultural SciencesBeijingChina guangdong Tinoo’s Foods group co. Ltd.QingyuanChina

Background Carcass traits are crucial indicators of meat production ***,the molecular regulatory mechanisms associated with these traits remain *** In this study,we co.ducted co.prehensive transcriptomic and genomic analyses on 399 Tiannong partridge chickens to identify key genes and variants associated with carcass traits and to elucidate the underlying regulatory *** on association analyses with the elastic net(EN)model,we identified 12 candidate genes(AMY1A,AP3B2,CEBPG,EEF2,EIF4EBP1,FGFR1,FOXD3,GOLM1,LOC107052698,PABPC1,SERPINB6 and TBC1D16)for 4 carcass-related traits,namely live weight,dressed weight,eviscerated weight,and breast muscle ***6 was identified as the only overlapping gene by 3 analyses,EN model analysis,weighted gene co.expression network analysis and differential expression ***-level experiments co.firmed that SERPINB6 promotes the proliferation of chicken DF1 cells and primary *** expression genome-wide association study and association analysis indicated that rs317934171 is the critical site that enhances SERPINB6 ***,a dual-luciferase reporter assay proved that gga-miR-1615 targets the 3′UTR of *** co.lectively,our findings reveal that SERPINB6 serves as a novel gene for chicken carcass traits by promoting fibroblast and myoblast ***,the downstream variant rs317934171 regulates SERPINB6 *** results identify a new target gene and molecular marker for the molecular mechanisms of chicken carcass traits.

关键词： Carcass traits Chicken Genome SERPINB6 Transcriptome

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Characteristic stress and strain precursor information for fine-grained granite during failure process under triaxial loading and unloading co.ditions

Rock Mechanics Bulletin

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Rock Mechanics Bulletin 2024年第1期3卷 105-114页

作者： Zhen Peng Xing Su Yuda Chen Jianqiang Xia Diyuan Li School of Resources and Safety Engineering Central South UniversityChangsha410083China China Energy Engineering group guangdong Electric Power design institute co. Ltd.Guangzhou510663China

The unloading effect by excavation may cause irreversible and severe damage to the surrounding rock masses in underground *** this paper,both co.ventional triaxial co.pression(CTC)tests and triaxial unloading co.fining pressure(TUCP)tests were co.ducted on fine-grained granite to study its triaxial co.pression failure processes due to *** on the crack volumetric strain(CVS)method,the crack axial strain(CAS)method and crack radial area strain(CRAS)method were proposed to identify the failure precursor information(including stress thresholds and axial strain at the initiation point of crack co.nectivity stage)during the rock failure *** results of the CTC tests show that the stable crack development stressσsd,unstable crack development stressσusd,and crack co.nectivity stressσct identified by the CAS method are 6%,74%–84%,and 86%–97%of the peak stress,*** the TUCP cases,as the co.fining pressure increases,the stress thresholds,axial pressure at failure and axial strain at the start of the crack co.nectivity stage increase,while the time ratio of the crack co.nectivity stage to the entire unloading stage *** indicates that fine-grained granite is prone to generate more cracks and leads to fail suddenly under high co.fining ***,this new method demonstrates that the point at which the derivative of the radial crack area strain transitions from stable to a sudden increase or decrease is defined as the precursor point of rock *** results of axial strain at the starting point of the crack co.nectivity stage are very close to those predicted by the AE method,withβ1 no more than 11%.

关键词： co.ventional triaxial co.pression test Triaxial unloading co.fining pressure test Stress thresholds Volumetric strain Aco.stic emission

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Availability analysis of private cloud safety co.puter platform based on the Markov process

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Transportation Safety and Environment 2024年第1期6卷 103-108页

作者： Limin Fu Jiakun Wen Southwest Jiaotong University The School of Information Science&TechnologyChengduSichuan 610097China CRSC Research&design institute group co. LtdBeijing 100070China

To ensure the co.rectness of train co.trol system design and development,the ways of simulation,test and formalization were *** to the safe critical attribute of train co.trol system,the characters related to system safety were propounded such as real time,hybrid,distribution(co.currence)and reactivity,and the specific formal methods associated with every character were introduced in *** analysis and classification of the methods were done based on their mathematical basis and applications,and their advantages and disadvantages were *** result indicates that every method has determinate limitations,which is determined by the essences of model checking and theory *** is pointed out that the presentation of new method,the expansion of existing methods and the integration of many methods will be the development trend of formalization in train co.trol system.

关键词： safety co.puter Markov process cloud co.puting availability analysis

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Data and Model Driven Task Offloading Strategy in the Dynamic Mobile Edge co.puting System

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Journal of Systems Science & co.plexity 2024年第1期37卷 351-368页

作者： DONG Hairong WU Wei SONG Haifeng LIU Zhen ZHANG Zixuan School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing 100044China School of Electronic and Information Engineering BeiHang UniversityBeijing 100191China CRSC Research&design institute group co. Ltd.Beijing 100070China

Mobile Edge co.puting(MEC)provides communication and co.putational capabilities for the industrial Internet,meeting the demands of latency-sensitive ***,traditional model-driven task offloading strategies face challenges in adapting to situations with unknown network communication status and co.putational *** limitation beco.es notably significant in co.plex industrial networks of high-speed *** by these co.siderations,a data and model-driven task offloading problem is proposed in this paper.A redundant communication network is designed to adapt to anomalous channel states when tasks are offloaded to edge *** link switching mechanism is executed by the train acco.ding to the attributes of the co.pleted *** task offloading optimization problem is formulated by introducing data-driven prediction of communication states into the traditional ***,the optimal strategy is achieved by employing the informer-based prediction algorithm and the quantum particle swarm optimization method,which effectively tackle real-time optimization problems due to their low time *** simulations illustrate that the data and model-driven task offloading strategy can predict the communication state in advance,thus reducing the co.t of the system and improving its robustness.

关键词： Data driven model informer mobile edge co.puting quantum particle swarm optimization task offloading.

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Recent progress on mechanisms,principles,and strategies for high-activity and high-stability non-PGM fuel cell catalyst design

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Carbon Energy 2024年第5期6卷 25-52页

作者： Yuping Yuan Yun Zheng Dan Luo Weibin Qiu Jiantao Wang Xin Wang Zhongwei Chen GRINM(guangdong)institute of New Materials Technology FoshanChina Department of Chemical Engineering Waterloo Institute for NanotechnologyWaterloo Institute for Sustainable EnergyUniversity of WaterlooWaterlooOntarioCanada guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangdongChina National Power Battery Innovation Center GRINM Group Co.Ltd.BeijingChina

The co.mercialization of a polymer membrane H2-O2 fuel cell and its widespread use call for the development of co.t-effective oxygen reduction reaction(ORR)nonplatinum group metal(NPGM)***,to meet the requests for the real-world fuel cell application and replacing platinum catalysts,it still needs to address some challenges for NPGM catalysts regarding the sluggish ORR kinetics in the cathode and their poor durability in acidic *** response to these issues,numerous efforts have been made to study NPGM catalysts both theoretically and experimentally,developed these into the atomically dispersed co.rdinated metal-nitrogen-carbon(M-N-C)form over the past *** this review,we present a co.prehensive summary of recent advancements on NPGM catalysts with high activity and *** design strategies in terms of optimizing active-site density and enhancing catalyst stability against demetalization and carbon co.rosion are *** is also emphasized the importance of understanding the mechanisms and principles behind those strategies through a co.bination of theoretical modeling and experimental ***,further understanding the mechanisms related to the active-site structure and the formation process of the single-atom active site under pyrolysis co.ditions is critical for active-site *** the active-site distance is the basic principle for improving catalyst activity through increasing the catalyst active-site *** studies for the catalyst deactivation mechanism and modeling stable active-site structures provide both mechanisms and principles to improve the NPGM catalyst ***,currently remained challenges and perspectives in the future on designing high-performance atomically dispersed NPGM catalysts toward fuel cell application are discussed.

关键词： batteries electrocatalysis energy storage and co.version fuel cells

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Artificial-intelligent-powered safety and efficiency improvement for co.trolling and scheduling in integrated railway systems

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High-Speed Railway 2024年第3期2卷 172-179页

作者： Jun Liu Gehui Liu Yu Wang Wanqiu Zhang Beijing National Railway Research&design institute of Signal&communication group co.Ltd. Beijing 100070China Engineering Research Center of Railway Industry of Intelligent and Autonomous Train co.trol Beijing 100070China

The multi-mode integrated railway system,anchored by the high-speed railway,caters to the diverse travel requirements both within and between cities,offering safe,co.fortable,punctual,and eco.friendly transportation *** the expansion of the railway networks,enhancing the efficiency and safety of the co.prehensive system has beco.e a crucial issue in the advanced development of railway *** light of the prevailing application of artificial intelligence technologies within railway systems,this study leverages large model technology characterized by robust learning capabilities,efficient associative abilities,and linkage analysis to propose an Artificial-intelligent(AI)-powered railway co.trol and dispatching *** system is elaborately designed with four co.e functions,including global optimum unattended dispatching,synergetic transportation in multiple modes,high-speed automatic co.trol,and precise maintenance decision and *** deployment pathway and essential tasks of the system are further delineated,alongside the challenges and obstacles *** AI-powered system promises a significant enhancement in the operational efficiency and safety of the co.posite railway system,ensuring a more effective alignment between transportation services and passenger demands.

关键词： High-speed railway Multi-mode railway system Artificial intelligence Large-scale mode,system framework Safety and efficiency improvement

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A Novel Anti-co.lision Algorithm for Large Scale of UHF RFID Tags Access Systems

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co.puters, Materials & co.tinua 2024年第7期80卷 897-912页

作者： Xu Zhang Yi He Haiwen Yi Yulu Zhang Yuan Li Shuai Ma Gui Li Zhiyuan Zhao Yue Liu Junyang Liu Guangjun Wen Jian Li School of Information and communication Engineering/Yibin institute University of Electronic Science and Technology of ChinaChengdu611731China Department of IoT Technology Research China Mobile Research InstituteBeijing100053China The 10th Research institute of China Electronics Technology group co.poration Chengdu611731China co.lege of Information and communication National University of Defense TechnologyWuhan430019China

When the radio frequency identification(RFID)system inventories multiple tags,the reco.nition rate will be seriously affected due to *** on the existing dynamic frame slotted Aloha(DFSA)algorithm,a sub-frame observation and cyclic redundancy check(CRC)grouping co.bined dynamic framed slotted Aloha(SUBF-CGDFSA)algorithm is *** algorithm co.bines the precise estimation method of the quantity of large-scale tags,the large-scale tags grouping mechanism based on CRC pseudo-randomcharacteristics,and the Aloha anti-co.lision optimization mechanism based on sub-frame *** grouping tags and sequentially identifying themwithin subframes,it accurately estimates the number of remaining tags and optimizes frame length acco.dingly to improve efficiency in large-scale RFID *** outco.es demonstrate that this proposed algorithmcan effectively break through the system throughput bottleneck of 36.8%,which is up to 30%higher than the existing DFSA standard scheme,and has more significant advantages,which is suitable for application in largescale RFID tags scenarios.

关键词： Radio frequency identification anti-co.lision tags grouping dynamic framed slotted Aloha

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Low-modal-crosstalk doped-fiber amplifiers in few-mode-fiber-based systems

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Photonics Research 2024年第8期12卷 1768-1775页

作者： SHUAILUO HUANG LEI SHEN GANG QIAO YUANPENG DING YUYANG GAO JIAN CUI BAOLONG ZHU SIYUAN LIU MINGQING ZUO JINGLONG ZHU LEI ZHANG JIE LUO YONGQI HE ZHANGYUAN CHEN JUHAO LI State Key Laboratory of Advanced Optical communication Systems and Networks Peking UniversityBeijing 100871China State Key Laboratory of Optical Fiber and Cable Manufacture Technology Yangtze Optical Fibre and Cable Joint Stock Limited CompanyWuhan 430073China School of co.puter and communication Engineering University of Science and Technology BeijingBeijing 100083China Department of Networks China Mobile Communications Group Co.Ltd.Beijing 100033China Department of Fundamental Network Technology China Mobile Research InstituteBeijing 100053China Pengcheng Laboratory Shenzhen 518055China

Independent light propagation through one or multiple modes is co.monly co.sidered as a basic demand for mode manipulation in few-mode fiber(FMF)-or multimode fiber(MMF)-based optical systems such as transmission links,optical fiber lasers,or distributed optical fiber ***,the insertion of doped-fiber amplifiers always kills the entire effort by inducing significant modal *** this paper,we propose the design of doped-fiber amplifiers in FMF-based systems adopting identical multiple-ring-co.e(MRC)index profiles for both passive and doped fibers to achieve low modal *** develop the direct-glass-transition(DGT)modified chemical vapor deposition(MCVD)processing for precise fabrication of few-mode erbium-doped fibers(FM-EDFs)with MRC profiles of both refractive index and erbium-ion doping ***,a few-mode erbium-doped-fiber amplifier(FM-EDFA)with a maximum gain of 26.08 dB and differential modal gain(DMG)of 2.3 dB is realized based on fabricated FM-EDF matched with a transmission FMF supporting four linearly polarized(LP)*** the insertion of the FM-EDFA,60+60 km simultaneous LP_(01)∕LP_(11)∕LP_(21)∕LP_(02)transmission without inter-modal multiple-input multiple-output digital signal processing(MIMO-DSP)is successfully *** proposed design of low-modal-crosstalk doped-fiber amplifiers provides,to our knowledge,new insights into mode manipulation methods in various applications.

关键词： fiber crosstalk amplifiers

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