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Study on creep deformation and energy development of underground surrounding rock under four‐dimensional support

Deep Underground Science and Engineering 2024年第1期3卷 25-38页

作者： Zhanguo Ma junyu sun Peng Gong Pengfei Yan Nan Cui Ruichong Zhang School of Mechanics and Civil Engineering China University of Mining and TechnologyXuzhouChina State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhouChina Department of Mining Engineering Colorado School of MinesGoldenUSA

There is an urgent need to develop optimal solutions for deformation control of deep high‐stress roadways,one of the critical problems in underground *** previously proposed four‐dimensional support(hereinafter 4D support),as a new support technology,can set the roadway surrounding rock under three‐dimensional pressure in the new balanced structure,and prevent instability of surrounding rock in underground ***,the influence of roadway depth and creep deformation on the surrounding rock supported by 4D support is still *** study investigated the influence of roadway depth and creep deformation time on the instability of surrounding rock by analyzing the energy *** elastic strain energy was analyzed using the program redeveloped in *** numerical simulation results indicate that the combined support mode of 4D roof supports and conventional side supports is highly applicable to the stability control of surrounding rock with a roadway depth exceeding 520 *** the increase of roadway depth,4D support can effectively restrain the area and depth of plastic deformation in the surrounding ***,4D support limits the accumulation range and rate of elastic strain energy as the creep deformation time increases.4D support can effectively reduce the plastic deformation of roadway surrounding rock and maintain the stability for a long deformation period of 6 *** confirmed by in situ monitoring results,4D support is more effective for the long‐term stability control of surrounding rock than conventional support.

关键词： coal mines elastic strain energy four‐dimensional support large roadway depth long‐term stability control plastic deformation surrounding rock

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Combustion Synthesis and Luminescent Properties of CaO: Eu^(3+), M^+ (M=Li, Na, K) Phosphor

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Journal of Wuhan University of Technology(Materials Science) 2010年第2期25卷 179-183页

作者：康明 College of Material Science and Engineering Southwest University of Science and Technology

Li ^＋ , Na^ ＋ , or K ^＋ co-doped CaO： Eu^3＋ phosphors were prepared by the combustion synthesis method and characterized by X-ray diffraction （XRD）, photoluminescence and photolumi-nescence excitation （PL-PLE） spectra. The experimental results show that, upon excitation with 250 nm xenon light, the emission spectrum of the CaO： Eu^3＋ consists of 4f-4f emission transitions from the 5D0 excited level to the 7FJ （J=1, 2, 3） levels with the mainly electric dipole transition 5D0→7F2 of Eu3＋, indicating that the Eu^3＋ occupies a low symmetry. The charge-transfer band （CTB） shows somewhat red shift with the decreasing ionic radii of co-doped alkali metal ions. The PL and PLE intensities are significantly enhanced, especially the strongest intensity of luminescent is CaO： Eu^3＋, Li ＋ phosphor, when alkali metal ions are incorporated. The strongest peak of emission is slightly shifted from 614 to 593 nm, indicating that the Eu^3＋ ion locates in a symmetric position （Oh） when alkali metal ions are incorporated.

关键词： luminescence CaO: Eu^3+ combustion method

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Stationary Almost Markov ε-Equilibria for Discounted Stochastic Games with Borel Spaces and Unbounded Payoffs

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Journal of Systems Science & Complexity 2024年第4期37卷 1672-1684页

作者： WU Yiting ZHANG junyu HUANG Song School of Mathematics Sun Yat-Sen UniversityGuangzhou 510275China School of Software and Microelectronics Peking UniversityBeijing 100871China

This paper is concerned with nonzero-sum discrete-time stochastic games in Borel state and action spaces under the expected discounted payoff *** payoff function can be *** transition probability is a convex combination of finite probability measures that are dominated by a probability measure on the state space and depend on the state *** suitable conditions,the authors establish the existence of stationary almost Markov ε-equilibria and give an approximation method via some stochastic games with bounded ***,a production game is introduced to illustrate the applications of the main result,which generalizes the bounded payoff case.

关键词： Almost Markovε-equilibrium Borel state space expected discounted payoff criterion nonzero-sum stochastic games unbounded payoffs

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Domain Engineering the Flexoelectric Response of BaTiO_(3)–SrTiO_(3) Binary Films:A Phase Field Study

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Acta Mechanica Solida Sinica 2024年第4期37卷 590-597页

作者： junyu Tao Fan Zhang Jianyuan Zhang Weijin Chen Yue Zheng School of Materials Shenzhen Campus of Sun Yat-sen UniversityShenzhen518107China Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices School of PhysicsSun Yat-sen UniversityGuangzhou510275China State Key Laboratory of Optoelectronic Materials and Technologies School of PhysicsSun Yat-sen UniversityGuangzhou510275China Centre for Physical Mechanics and Biophysics School of PhysicsSun Yat-sen UniversityGuangzhou510275China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai519082China

The flexoelectric effect describes the interplay between material polarization and strain *** much research has focused on control strategies for flexoelectricity,the impact of ferroelectric domain structure on the flexoelectric effect remains *** phase field simulations,we conduct a comparative study on the flexoelectric response of two types of BaTiO_(3)–SrTiO_(3) binary films:BaTiO_(3)–SrTiO_(3) multilayers and(Ba,Sr)TiO_(3) solid *** findings reveal that the flexoelectric response of these two systems,at the same Ba/Sr ratio,differs not only in magnitude but also in other aspects like temperature dependence,linearity,and hysteresis,due to their different ferroelectric domain structures and evolution *** study deepens our current understanding of flexoelectricity in ferroelectrics and suggests“domain engineering”as a potential way to tailor this effect.

关键词： Ferroelectric Flexoelectricity Multilayers Solid solution Phase field

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微纳多孔聚合物基辐射冷却材料的制备、性能调控及应用

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材料导报 2023年第24期37卷 230-243页

作者：纪澄王璟孙骏宇安一卓国防科技大学理学院长沙410073 国防科技大学空天科学学院长沙410073

光和热是自然界最普遍的两种能量形式,通过对光的调控而实现对热的管理,是能源、环境、航空航天、军事防护等领域常用的被动式热管理手段。微纳多孔聚合物由于其独特的尺度和形貌可以实现对特定波长入射光的强反射,再借助聚合物自身官... 详细信息

光和热是自然界最普遍的两种能量形式,通过对光的调控而实现对热的管理,是能源、环境、航空航天、军事防护等领域常用的被动式热管理手段。微纳多孔聚合物由于其独特的尺度和形貌可以实现对特定波长入射光的强反射,再借助聚合物自身官能团在中红外波段的本征吸收而表现出选择性红外辐射/透射特征,可以在较宽波段范围内发挥有效的光热调控功能,并且因为原材料成本低廉、制备方法简单、具备卷对卷规模化生产潜力及良好的耐候性和力学性能,而备受研究人员关注。本文以辐射冷却应用为背景,概述了微纳多孔聚合物材料的制备及形貌调控方法,在此基础上综述了多孔聚合物辐射冷却性能调控的相关研究成果,并进一步阐述了微纳多孔聚合物在辐射冷却领域的应用,最后对其存在的问题及未来的发展方向进行了总结和展望。

关键词：多孔聚合物辐射冷却可控制备光谱调控光热管理应用

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基于探地雷达的高铁无砟轨道结构层病害检测

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西南交通大学学报 2016年第1期51卷 8-13页

作者：廖红建朱庆女昝月稳谢勇勇孙俊煜西安交通大学人居环境与建筑工程学院陕西西安710049 西南交通大学地球科学与环境工程学院四川成都610031

为了检测高速铁路(高铁)无砟轨道混凝土结构内部在施工过程中产生的缺陷,避免在高速列车荷载作用下发展成路基病害,运用探地雷达技术对高铁无砟轨道结构进行了二维正演模拟分析.基于有限差分法,在时间域上推导了探地雷达二维正演模拟方... 详细信息

为了检测高速铁路(高铁)无砟轨道混凝土结构内部在施工过程中产生的缺陷,避免在高速列车荷载作用下发展成路基病害,运用探地雷达技术对高铁无砟轨道结构进行了二维正演模拟分析.基于有限差分法,在时间域上推导了探地雷达二维正演模拟方程.针对易形成高铁无砟轨道病害缺陷的多种复杂工况,建立了CRTSⅡ型板式无砟轨道的地电模型,分别对CA砂浆层不同填充程度、CA砂浆层硬化过程进行了二维正演数值模拟,分析了探地雷达二维正演模拟图像的特征.模拟结果表明,二维正演模拟可以清楚地分辨板式无砟轨道结构内不同介质层的分界面,以及钢筋的数目和位置.

关键词：交通工程高速铁路无砟轨道路基病害探地雷达正演数值模拟

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Consensus on potential biomarkers developed for use in clinical tests for schizophrenia

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General Psychiatry 2022年第1期35卷 42-52页

作者： Ping Lin junyu sun Xiaoyan Lou Dan Li Yun Shi Zhenhua Li Peijun Ma Ping Li Shuzi Chen Weifeng Jin Shuai Liu Qing Chen Qiong Gao Lili Zhu Jie Xu Mengyuan Zhu Mengxia Wang Kangyi Liang Ling Zhao Huabin Xu Ke Dong Qingtian Li Xunjia Cheng Jinghong Chen Xiaokui Guo Department of Clinical Laboratory Shanghai Mental Health CenterShanghai Jiao Tong University School of MedicineShanghaiChina Department of Medical Microbiology and Parasitology Fudan University School of Basic Medical SciencesShanghaiChina Department of Psychosis Institute of PsychiatryPsychology and NeuroscienceKing’s College LondonLondonUK Clinical Laboratory Affiliated Hospital of West Anhui Health Vocational CollegeLu’anAnhuiChina School of Global Health Chinese Center for Tropical Diseases ResearchShanghai Jiao Tong University School of MedicineShanghaiChina Editorial Office of General Psychiatry Shanghai Mental Health CenterShanghai Jiao Tong University School of MedicineShanghaiChina Shanghai Key Laboratory of Psychotic Disorders Shanghai Jiao Tong University School of MedicineShanghaiChina

Background Schizophrenia is a serious mental illness affecting approximately 20 million individuals *** genetic and environmental factors contribute to the *** left undiagnosed and untreated,schizophrenia results in impaired social function,repeated hospital admissions,reduced quality of life and decreased life *** diagnosis largely relies on subjective evidence,including self-reported experiences,and reported behavioural abnormalities followed by psychiatric *** addition,psychoses may occur along with other conditions,and the symptoms are often episodic and transient,posing a significant challenge to the precision of ***,objective,specific tests using biomarkers are urgently needed for differential diagnosis of schizophrenia in clinical *** We aimed to provide evidence-based and consensus-based recommendations,with a summary of laboratory measurements that could potentially be used as biomarkers for schizophrenia,and to discuss directions for future *** We searched publications within the last 10 years with the following keywords:‘schizophrenia’,‘gene’,‘inflammation’,‘neurotransmitter’,‘protein marker’,‘gut microbiota’,‘pharmacogenomics’and‘biomarker’.A draft of the consensus was discussed and agreed on by all authors at a round table *** We summarised the characteristics of candidate diagnostic markers for schizophrenia,including genetic,inflammatory,neurotransmitter,peripheral protein,pharmacogenomic and gut microbiota *** also proposed a novel laboratory process for diagnosing schizophrenia in clinical practice based on the evidence summarised in this *** Further efforts are needed to identify schizophrenia-specific genetic and epigenetic markers for precise diagnosis,differential diagnosis and ethnicity-specific markers for the Chinese *** development of novel laboratory techniques is making it possible to use these biomarkers clinically

关键词： diagnosis schizophrenia impaired

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Optimized operation scheme of flash-memory-based neural network online training with ultra-high endurance

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Journal of Semiconductors 2024年第1期45卷 33-37页

作者： Yang Feng Zhaohui sun Yueran Qi Xuepeng Zhan junyu Zhang Jing Liu Masaharu Kobayashi Jixuan Wu Jiezhi Chen School of Information Science and Engineering(ISE) Shandong UniversityQingdao 266200China Neumem Co. LtdHefei 230093China Key Laboratory of Microelectronic Devices and Integrated Technology Institute of Microelectronics of Chinese Academy of SciencesBeijing 100084China Institute of Industrial Science The University of TokyoTokyoJapan

With the rapid development of machine learning,the demand for high-efficient computing becomes more and more *** break the bottleneck of the traditional Von Neumann architecture,computing-in-memory(CIM)has attracted increasing attention in recent *** this work,to provide a feasible CIM solution for the large-scale neural networks(NN)requiring continuous weight updating in online training,a flash-based computing-in-memory with high endurance(10^(9) cycles)and ultrafast programming speed is *** the one hand,the proposed programming scheme of channel hot electron injection(CHEI)and hot hole injection(HHI)demonstrate high linearity,symmetric potentiation,and a depression process,which help to improve the training speed and *** the other hand,the low-damage programming scheme and memory window(MW)optimizations can suppress cell degradation effectively with improved computing *** after 109 cycles,the leakage current(I_(off))of cells remains sub-10pA,ensuring the large-scale computing ability of *** characterizations are done on read disturb to demonstrate its robust *** processing CIFAR-10 tasks,it is evident that~90%accuracy can be achieved after 109 cycles in both ResNet50 and VGG16 *** results suggest that flash-based CIM has great potential to overcome the limitations of traditional Von Neumann architectures and enable high-performance NN online training,which pave the way for further development of artificial intelligence(AI)accelerators.

关键词： NOR flash memory computing-in-memory endurance neural network online training

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可生物降解塑料取代传统塑料--对碳排放的影响

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Engineering 2024年第1期32卷 152-162页

作者： Guanyi Chen Jianyuan Li Yunan sun Zhi Wang Gary ALeeke Christian Moretti Zhanjun Cheng Yuan Wang Ning Li Lan Mu Jinyu Li junyu Tao Beibei Yan Li'an Hou Interdisciplinary Innovation Lab for Environment and Energy School of Mechanical Engineering&School of Biotechnology and Food ScienceTianjin University of CommerceTianjin 300134China School of Environmental Science and Engineering Tianjin UniversityTianjin 300350China School of Ecology and Environment Tibet UniversityLhasa 850012China Tianjin Key Laboratory of Biomass Wastes UtilizationTianjin Engineering Research Center for Organic Wastes Safe Disposal and Energy UtilizationTianjin 300072China School of Chemical Engineering University of BirminghamBirmingham B152TTUK Department of Environmental Systems Science ETH ZürichZürich CH-8092Switzerland

In recent years,a great deal of attention has been focused on the environmental impact of plastics,includ-ing the carbon emissions related to plastics,which has promoted the application of biodegradable *** worldwide have shown high interest in replacing traditional plastics with biodegradable ***,no systematic comparison has been conducted on the carbon emissions of biodegrad-able versus traditional plastic *** study evaluates the carbon emissions of traditional and biodegradable plastic products(BPPs)over four stages and briefly discusses environmental and economic *** scenarios-namely,the traditional method,chemical recycling,industrial composting,and anaerobic digestion-are considered for the disposal of waste BPPs(WBPPs).The analysis takes China as a case *** results show that the carbon emissions of 1000traditional plastic products(plastic bags,lunch boxes,cups,etc.)were52.09-150.36 carbon emissions equivalent of per kilogram(kg CO_(2)eq),with the stage of plastic production contributing 50.71%-50.77%.In comparison,1000 similar BPPs topped out at 21.06-56.86 kg CO_(2)eq,approximately 13.53%-62.19%lower than traditional plastic *** difference was mainly at the stages of plastic production and waste disposal,and the BPPs showed significant carbon reduction potential at the raw material acquisition *** disposal plays an important role in environmental impact,and composting and anaerobic digestion are considered to be preferable disposal methods for ***,the high cost of biodegradable plastics is a challenge for their widespread *** study has important reference significance for the sustainable development of the biodegradableplastics industry.

关键词： Carbon emissions Biodegradable plastics Different disposal scenarios Daily life consumption Environmental and economic discussion

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黄土孔径和持水特性的分形维数研究

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西北大学学报（自然科学版） 2022年第3期52卷 416-422页

作者：廖红建刘少华何玉琪孙俊煜西安交通大学人居环境与建筑工程学院陕西西安710049

黄土结构疏松、水敏性强,在水力作用下,易导致强度骤降,水稳性减弱甚至丧失。黄土中水分以自由水、结合水等多种形式存在于土的孔隙中,孔隙的分布特征是决定土中水分存在和变化规律的主要因素。该文基于压力膜仪试验,结合孔径分布的计... 详细信息

黄土结构疏松、水敏性强,在水力作用下,易导致强度骤降,水稳性减弱甚至丧失。黄土中水分以自由水、结合水等多种形式存在于土的孔隙中,孔隙的分布特征是决定土中水分存在和变化规律的主要因素。该文基于压力膜仪试验,结合孔径分布的计算理论,做出了土水特征曲线和孔径的分布曲线,并结合分形理论,以分形维数为孔隙分布规律的评价指标,建立不同工况下黄土的含水状态变化特性与细观孔隙分布特征间的关系。结果表明,土中孔隙越小,分形维数越大,土的含水状态变化越不明显;土的残余含水率与分形维数呈线性相关,残余含水率增高的同时,分形维数和土体的持水能力也增大;土的进气值与分形维数呈正相关,但不呈线性关系;土中的大孔隙越多,土的进气值就越大,分形维数越大。

关键词：非饱和黄土孔径分布分形理论持水特性

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