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Investigation on coal damage and fracture extension law of liquid nitrogen injection pre-cooling and fracturing under true triaxial stress

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International Journal of Mining Science and Technology 2025年第2期35卷 213-229页

作者： Botao li Haifei lin Jianping wei Hongtu Zhang Shugang li Zongyong wei Lei Qin Pei Wang Rongwei Luo Zeran liu School of Safety Science and Engineering Henan Polytechnic UniversityJiaozuo 454003China State Key Laboratory Cultivation Base for Gas Geology and Gas Control Henan Polytechnic UniversityJiaozuo 454003China State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization Henan Polytechnic UniversityJiaozuo 454003China College of Safety Science and Engineering Xi’an University of Science and TechnologyXi’an 710054China Key Laboratory of Shaanxi Province Universities of Gas Disaster Prevention and Control in Western Coal Mines Xi’an 710054China

To more accurately describe the coal damage and fracture evolution law during liquid nitrogen(LN_(2))fracturing under true triaxial stress,a thermal-hydraulic-mechanical-damage(THMD)coupling model for LN_(2) fracturing coal was developed,considering the coal heterogeneity and thermophysical parameters of *** accuracy and applicability of model were verified by comparing with LN_(2) injection pre-cooling and fracturing experimental *** effects of different pre-cooling times and horizontal stress ratios on coal damage evolution,permeability,temperature distribution,and fracture characteristics were *** results show that the permeability and damage of the coal increase exponentially,while the temperature decreases exponentially during the fracturing *** the pre-cooling time increases,the damage range of the coal expands,and the fracture propagation becomes more *** initiation pressure and rupture pressure decrease and tend to stabilize with longer precooling *** the horizontal stress ratio increases,fractures preferentially extend along the direction of maximum horizontal principal stress,leading to a significant decrease in both initiation and rupture *** a horizontal stress ratio of 3,the initiation pressure drops by 48.07%,and the rupture pressure decreases by 41.36%.The results provide a theoretical basis for optimizing LN_(2) fracturing techniques and improving coal seam modification.

关键词： liquid nitrogen fracturing Thermal–hydraulic-mechanical-damage coupling Heterogeneous coal True triaxial stress Fracture morphology

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Moment Redistribution Effect of the Continuous Glass Fiber Reinforced Polymer-Concrete Composite Slabs Based on Static Loading Experiment

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Structural Durability & Health Monitoring 2025年第1期19卷 105-123页

作者： Zhao-Jun Zhang Wen-wei Wang Jing-Shui Zhen Bo-Cheng li de-Cheng Cai Yang-Yang Du Hui Huang Offshore Oil Engineering Co.Ltd. Tianjin300461China department of Bridge Engineering School of TransportationSoutheast UniversityNanjing211189China

This study aimed to investigate the moment redistribution in continuous glass fiber reinforced polymer(GFRP)-concrete composite slabs caused by concrete cracking and steel bar yielding in the negative bending moment *** experimental bending moment redistribution test was conducted on continuous GFRP-concrete composite slabs,and a calculation method based on the conjugate beam method was *** composite slabs were formed by combining GFRP profiles with a concrete layer and supported on steel beams to create two-span continuous composite slab *** methods,epoxy resin bonding,and stud connection,were used to connect the composite slabs with the steel *** experimental findings showed that the specimen connected with epoxy resin exhibited two moments redistribution phenomena during the loading process:concrete cracking and steel bar yielding at the internal *** contrast,the composite slab connected with steel beams by studs exhibited only one-moment redistribution phenomenon throughout the loading *** the concrete at the internal support cracked,the bending moment decreased in the internal support section and increased in the midspan *** the steel bars yielded,the bending moment further decreased in the internal support section and increased in the mid-span *** GFRP profiles do not experience cracking,there was no significant decrease in the bending moment of the mid-span *** test specimens experienced compressive failure of concrete at the mid-span *** results showed good agreement between the calculated and experimental values of bending moments in the mid-span section and internal support *** proposed model can effectively predict the moment redistribution behavior of continuous GFRP-concrete composite slabs.

关键词： Moment redistribution GFRP-concrete composite slabs bending moment experimental study analysis model

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The Teleconnection between Rainfall over the Northeastern Slope of the Tibetan Plateau and Downstream Regions:Insights from 20 Years of Heavy Rainfall Events

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Advances in Atmospheric Sciences 2025年第2期42卷 327-341页

作者： wei SUN Rucong YU Jian li Zewen li State Key Laboratory of Severe Weather Chinese Academy of Meteorological SciencesBeijing 100081China Institute of Tibetan Plateau Meteorology China Meteorological AdministrationChengdu 610072China department of Atmospheric Science Yunnan UniversityKunming 650091China Inner Mongolia Autonomous Region Mete-orological Service Center Hohhot 010051China

The connection between rainfall over topographic regions and their downstream areas represents a phenomenon of great concern in atmospheric *** on the rainfall events of the past two decades,we analyzed the impact of rainfall over the Northeastern Slope of the Tibetan Plateau(NSTP)on rainfall in downstream *** discovered that rainfall followed two propagation routes,guided by two modes related to the three-dimensional circulation *** the first mode,dominated by cold(warm)anomalies along the west(east)direction,rainfall over the NSTP was concentrated between an upstream cyclonic and a downstream anti-cyclonic anomalous circulation(an upstream trough and a downstream ridge).This pattern was accompanied by upper-level divergence,low-level convergence,a deep moist layer,and a vertical *** a consequence of the eastward movement of the trough-ridge system associated with the coldwarm anomalies,the rainfall over the NSTP moved eastward along 37°-40°N,reaching North China after about 36 *** the second mode,the circulation structure was also dominated by cold-warm anomalies but rotated clockwise,introducing cold anomalies to the northeast and warm anomalies to the east of the *** the southeastward movement of the circulation structure,rainfall concentrated upstream of the anti-cyclonic circulation around the warm center before moving southeastward to the Sichuan Basin along the eastern edge of the plateau after 30-36 *** findings of this study could broaden the understanding of rainfall-related teleconnection between two distant regions and offer helpful guidance for identifying early signals of rainfall disasters over the Chinese mainland.

关键词： teleconnection rainfall propagation three-dimensional circulation structure upper-tropospheric temperature anomaly

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Effect of pseudo-random number on the security of quantum key distribution protocol

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Chinese Physics B 2025年第2期34卷 41-46页

作者： Xiao-liang Yang Yu-Qing li Hong-wei li Henan Key Laboratory of Quantum Information and Cryptography SSF IEUZhengzhou 450000China

In the process of quantum key distribution(QKD), the communicating parties need to randomly determine quantum states and measurement bases. To ensure the security of key distribution, we aim to use true random sequences generated by true random number generators as the source of randomness. In practical systems, due to the difficulty of obtaining true random numbers, pseudo-random number generators are used instead. Although the random numbers generated by pseudorandom number generators are statistically random, meeting the requirements of uniform distribution and independence,they rely on an initial seed to generate corresponding pseudo-random sequences. Attackers may predict future elements from the initial elements of the random sequence, posing a security risk to quantum key distribution. This paper analyzes the problems existing in current pseudo-random number generators and proposes corresponding attack methods and applicable scenarios based on the vulnerabilities in the pseudo-random sequence generation process. Under certain conditions, it is possible to obtain the keys of the communicating parties with very low error rates, thus effectively attacking the quantum key system. This paper presents new requirements for the use of random numbers in quantum key systems, which can effectively guide the security evaluation of quantum key distribution protocols.

关键词： quantum key distribution pseudo-random security

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Adaptive-basis decomposition-based low-rank network for efficient non-uniform motion deblurring

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Optoelectronics Letters 2025年第1期21卷 43-50页

作者： CHEN Lei XIONG Qingbo ZHANG wei li Runde School of Software Henan UniversityKaifeng 475004China School of Applied Technology China University of Labor RelationsBeijing 100048China

In this study,we present a unified sparsity-driven framework that significantly enhances motion deblurring performance by integrating two key components:a custom-designed dataset and a low-rank module(LRM).This framework leverages the inherent sparsity of per-pixel blur kernels to bolster both deblurring accuracy and model ***,we propose an adaptive-basis decomposition-based deblurring(ADD)approach,which constructs a tailored training dataset to enhance the generalization capacity of the deblurring *** ADD framework adaptively decomposes motion blur into sparse basis elements,effectively addressing the intricacies associated with non-uniform ***,an LRM is proposed to improve the interpretability of deblurring models as a plug-and-play module,primarily designed to identify and harness the intrinsic sparse features in sharp images.A series of ablation studies have been conducted to substantiate the synergistic advantages of combining the proposed ADD with the LRM for overall improvement in deblurring ***,we empirically demonstrate through rigorous experimentation that incorporating the LRM into an existing Uformer network leads to substantial enhancement in reconstruction *** integration yields a sparsity-guided low-rank network(SGLRN).Operating under the overarching principle of sparsity,SGLRN consistently outperforms state-of-the-art methods across multiple standard deblurring *** experimental results,assessed through quantitative metrics and qualitative visual evaluations,provide compelling evidence of its *** overall deblurring results are available at Google Drive.

关键词： network motion uniform

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Combustion aerosols and suspended dust with controlled processes in Lhasa:Elemental analysis and size distribution characteristics

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Journal of Environmental Sciences 2025年第2期148卷 591-601页

作者： Jinglin li Zhuoga deqing Jie liang Tao Guo Jian Yao wei liu Shanghai Institute of Applied Physics Chinese Academy of ScienceShanghai 201800China University of Chinese Academy of Science Beijing 100049China Meteorological Bureau of Tibet Autonomous Region Lhasa 850000China

To explore air contamination resulting from special biomass combustion and suspended dust in Lhasa,the present study focused on the size distribution and chemical characteristics of particulate matter(PM)emission resulting from 7 types of non-fossil pollution *** investigated the concentration and size distribution of trace elements from 7 pollution sources collected in *** Lhasa’s atmospheric particulate matter data,enrichment factors(EFs)have been calculated to examine the potential impact of those pollution sources on the atmosphere quality of *** highest mass concentration of total elements of biomass combustion appeared at PM_(0.4),and the second highest concentration existed in the size fraction 0.4-1μm;the higher proportion(12%)of toxicmetals was produced by biomass *** elemental composition of suspended dust and atmospheric particulate matter was close(except for As and Cd);the highest concentration of elements was all noted in PM_(2.5-10)(PM3-10).Potassium was found to be one of the main biomass *** proportion of Cu in suspended dust is significantly lower than that of atmospheric particulate matter(0.53%and 3.75%),which indicates that there are other anthropogenic *** EFs analysis showed that the Cr,Cu,Zn,and Pb produced by biomass combustion were highly enriched(EFs>100)in all particle *** EFs of most trace elements increased with decreasing particle size,indicating the greater influence of humanfactors on smaller particles.

关键词： Size distribution Trace elements Particulate matter Enrichment factors Lhasa

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Recent progress on artificial intelligence-enhanced multimodal sensors integrated devices and systems

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Journal of Semiconductors 2025年第1期46卷 179-192页

作者： Haihua Wang Mingjian Zhou Xiaolong Jia Hualong wei Zhenjie Hu wei li Qiumeng Chen Lei Wang College of Integrated Circuit Science and Engineering Nanjing University of Posts and TelecommunicationsNanjing 210023China Nantong Institute of Nanjing University of Posts and Telecommunications Nantong 226021China

Multimodal sensor fusion can make full use of the advantages of various sensors,make up for the shortcomings of a single sensor,achieve information verification or information security through information redundancy,and improve the reliability and safety of the *** intelligence(AI),referring to the simulation of human intelligence in machines that are programmed to think and learn like humans,represents a pivotal frontier in modern scientific *** the continuous development and promotion of AI technology in Sensor 4.0 age,multimodal sensor fusion is becoming more and more intelligent and automated,and is expected to go further in the *** this context,this review article takes a comprehensive look at the recent progress on AI-enhanced multimodal sensors and their integrated devices and *** on the concept and principle of sensor technologies and AI algorithms,the theoretical underpinnings,technological breakthroughs,and pragmatic applications of AI-enhanced multimodal sensors in various fields such as robotics,healthcare,and environmental monitoring are *** a comparative study of the dual/tri-modal sensors with and without using AI technologies(especially machine learning and deep learning),AI-enhanced multimodal sensors highlight the potential of AI to improve sensor performance,data processing,and decision-making ***,the review analyzes the challenges and opportunities afforded by AI-enhanced multimodal sensors,and offers a prospective outlook on the forthcoming advancements.

关键词： sensor multimodal sensors machine learning deep learning intelligent system

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Investigation of spatiotemporal distribution and formation mechanisms of ozone pollution in eastern Chinese cities applying convolutional neural network

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Journal of Environmental Sciences 2025年第2期148卷 126-138页

作者： Qiaoli Wang Dongping Sheng Chengzhi Wu Xiaojie Ou Shengdong Yao Jingkai Zhao Feili li wei li Jianmeng Chen 无 College of Environment Zhejiang University of TechnologyHangzhou 310032China Key Laboratory of Biomass Chemical Engineering of the Ministry of Education Institute of Industrial Ecology and EnvironmentCollege of Chemical and Biological EngineeringZhejiang University(Zijingang Campus)Hangzhou 310027China Trinity Consultants Inc.(China office)Hangzhou 310012China Zhejiang University of Science&Technology Hangzhou 310023China

Severe ground-level ozone(O_(3))pollution over major Chinese cities has become one of the most challenging problems,which have deleterious effects on human health and the sustainability of *** study explored the spatiotemporal distribution characteristics of ground-level O_(3) and its precursors based on conventional pollutant and meteorological monitoring data in Zhejiang Province from 2016 to ***,a high-performance convolutional neural network(CNN)model was established by expanding the moment and the concentration variations to general ***,the response mechanism of O_(3) to the variation with crucial influencing factors is explored by controlling variables and interpolating target *** results indicated that the annual average MDA8-90th concentrations in Zhejiang Province are higher in the northern and lower in the *** the wind direction(WD)ranges from east to southwest and the wind speed(WS)ranges between 2 and 3 m/sec,higher O_(3) concentration prone to *** different temperatures(T),the O_(3) concentration showed a trend of first increasing and subsequently decreasing with increasing NO_(2) concentration,peaks at the NO_(2) concentration around 0.02mg/m^(3).The sensitivity of NO_(2) to O_(3) formation is not easily affected by temperature,barometric pressure and dew point ***,there is a minimum IRNO_(2) at each temperature when the NO_(2) concentration is 0.03 mg/m^(3),and this minimum IRNO_(2) decreases with increasing *** study explores the response mechanism of O_(3) with the change of driving variables,which can provide a scientific foundation and methodological support for the targeted management of O_(3) pollution.

关键词： Ozone Spatiotemporal distribution Convolutional neural network Ozone formation rules Incremental reactivity

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Cloning and tissue location of a specific protein gene of Bursaphelenchus xylophilus

Cloning and tissue location of a specific protein gene of Bu...

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江苏省植物病理学会第十二次会员代表大会暨学术研讨会

作者： Han-Yu Fu Jia-Hong Ren Hao li lin Huang Jian-Ren Ye de-wei li College of Forest Resources and Environment Nanjing Forestry University department of Biological Science and Technology Changzhi College

The pine wood nematode,Bursaphelenchus xylophilus,is the causal agent of the pine wilt *** differentiating *** from other nematodes species,especially its related species ***,is important for pine wood nematode detection,so we attempted to find a pine wood nematode-specific protein utilizing proteomics *** the present study,we compared the proteomes of *** with ***,utilizing 2-de and MALDI-TOF/TOF-MS *** total,15 proteins which were specifically expressed by *** in relatively high abundance were ***,the specificity of the identified proteins was verified by PCR using the genomic DNA of other nematodes species.A specific protein was at last *** specific protein gene of ***(Bx-Prx)was successfully cloned and expressed in *** situ hybridization pattern of Bx-Prx showed that it produced a strong expression signal behind the gonad in *** purified recombinant protein can be used as a candidate diagnostic antigen of pine wilt disease,which may lead to a new immunological method for detecting the pine wood nematode.

关键词： Bursaphelenchus xylophilus comparative proteomics 2-de in situ hybridization prokaryotic expression

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Precise gradient separation of nanoparticles using reduced graphene oxide-polyoxomolybdate membranes

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Science China Chemistry 2025年第1期68卷 209-216页

作者： Yixin Yang Wanlei Zhao Ruoxuan Zheng Hongqiang li wei Chen Yu-Fei Song State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing 100029China Quzhou Institute for Innovation in Resource Chemical Engineering Quzhou 324000China

The purification and size sieving of nanoparticles(NPs)represents a significant scientific ***,the rGO-polyoxometalates(POMs=PMo_(12),Mo_(132)and Mo_(368))membranes were fabricated successfully via a simple and scalable POMsassisted in-situ photoreduction *** the mass ratio of rGO to PMo_(12)was 1:30,the resultant rGO-PMo_(12)membranes with highly ordered and uniform nanochannels of 1.0 nm can be obtained,which showed an accurate carbon quantum dots(CQDs)separation with a cut-off size approximately 1.0 *** increase of the size of the interlayered POMs from PMo_(12)(1.0 nm),{Mo132}(2.9 nm)to{Mo_(368)}(3.8 nm),the resultant rGO-PMo_(12),rGO-Mo_(132)and rGO-Mo_(368)exhibited precise gradient separation of CQDs and Au nanoparticles by size exclusion *** results pave a promising way to construct new twodimensional(2D)membranes for highly efficient size-selective separation.

关键词： reduced graphene oxide polyoxometalates membranes gradient separation nanoparticles

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