检索结果-南通市图书馆

Estimating shear strength of high-level pillars supported with cemented backfilling using the HoekeBrown strength criterion

引用

Journal of Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 454-469页

作者： Kaizong Xia Congxin Chen Xiumin liu Yue Wang Xuanting liu Jiahao yuan State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China

Deep metal mines are often mined using the high-level pillars with subsequent cementation backfilling(HLSCB)mining *** the design stage,it is therefore important to have a reasonable method for determining the shear strength of the high-level pillars(*** and internal friction angle)when they are supported by cemented *** this study,a formula was derived for the upper limit of the confining pressure σ3max on a high-level pillar supported by cemented backfilling in a deep metal mine.A new method of estimating the shear strength of such pillars was then proposed based on the Hoek eBrown failure *** analysis indicates that the horizontal stress σhh acting on the cemented backfill pillar can be simplified by expressing it as a constant value.A reasonable and effective value for σ3max can then be *** value of s3max predicted using the proposed method is generally less than 3 *** this range,the shear strength of the high-level pillar is accurately calculated using the equivalent MohreCoulomb *** proposed method can effectively avoid the calculation of inaccurate shear strength values for the high-level pillars when the original HoekeBrown criterion is used in the presence of large confining pressures,*** situation in which the cohesion value is too large and the friction angle is too small can effectively be *** proposed method is applied to a deep metal mine in China that is being excavated using the HLSCB *** shear strength parameters of the high-level pillars obtained using the proposed method were input in the numerical *** numerical results show that the recommended level heights and sizes of the high-level pillars and rooms in the mine are rational.

关键词： Deep metal mines High-level pillars HoekeBrown strength criterion Cemented backfilling Confining pressure Shear strength

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Security and Privacy in Solar Insecticidal Lamps Internet of Things:Requirements and Challenges

引用

IEEE/CAA Journal of Automatica Sinica 2024年第1期11卷 58-73页

作者： Qingsong Zhao Lei shu Kailiang Li Mohamed Amine Ferrag Ximeng liu Yanbin Li the College of Artificial Intelligence Nanjing Agricultural UniversityNanjing 210031 the State Key Laboratory for Novel Software Technology Nanjing UniversityNanjing 210023 the State Key Laboratory of Cryptology Beijing 100878China IEEE the School of Engineering University of LincolnLincoln LN67TSUK the Artificial Intelligence and Digital Science Research Center Technology Innovation InstituteMasdar City 9639UAE the College of Computer and Data Science Fuzhou UniversityFuzhou 350108China

Solar insecticidal lamps(SIL) can effectively control pests and reduce the use of pesticides. Combining SIL and Internet of Things(IoT) has formed a new type of agricultural IoT,known as SIL-IoT, which can improve the effectiveness of migratory phototropic pest control. However, since the SIL is connected to the Internet, it is vulnerable to various security *** issues can lead to serious consequences, such as tampering with the parameters of SIL, illegally starting and stopping SIL,etc. In this paper, we describe the overall security requirements of SIL-IoT and present an extensive survey of security and privacy solutions for SIL-IoT. We investigate the background and logical architecture of SIL-IoT, discuss SIL-IoT security scenarios, and analyze potential attacks. Starting from the security requirements of SIL-IoT we divide them into six categories, namely privacy, authentication, confidentiality, access control, availability,and integrity. Next, we describe the SIL-IoT privacy and security solutions, as well as the blockchain-based solutions. Based on the current survey, we finally discuss the challenges and future research directions of SIL-IoT.

关键词： Challenges Internet of Things(IoT) privacy and security security requirements solar insecticidal lamps(SIL)

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chaotic CS Encryption:An Efficient Image Encryption Algorithm Based on Chebyshev Chaotic System and Compressive Sensing

引用

Computers, Materials & Continua 2024年第5期79卷 2625-2646页

作者： Mingliang Sun Jie yuan Xiaoyong Li Dongxiao liu Key Laboratory of Trustworthy Distributed Computing and Service(BUPT) Ministry of EducationBeijing University of Posts and TelecommunicationsBeijing100876China

Images are the most important carrier of human information. Moreover, how to safely transmit digital imagesthrough public channels has become an urgent problem. In this paper, we propose a novel image encryptionalgorithm, called chaotic compressive sensing (CS) encryption (CCSE), which can not only improve the efficiencyof image transmission but also introduce the high security of the chaotic system. Specifically, the proposed CCSEcan fully leverage the advantages of the Chebyshev chaotic system and CS, enabling it to withstand various attacks,such as differential attacks, and exhibit robustness. First, we use a sparse trans-form to sparse the plaintext imageand then use theArnold transformto perturb the image pixels. After that,we elaborate aChebyshev Toeplitz chaoticsensing matrix for CCSE. By using this Toeplitz matrix, the perturbed image is compressed and sampled to reducethe transmission bandwidth and the amount of data. Finally, a bilateral diffusion operator and a chaotic encryptionoperator are used to perturb and expand the image pixels to change the pixel position and value of the compressedimage, and ultimately obtain an encrypted image. Experimental results show that our method can be resistant tovarious attacks, such as the statistical attack and noise attack, and can outperform its current competitors.

关键词： Image encryption chaotic system compressive sensing arnold transform

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Elaidic acid leads to mitochondrial dysfunction via mitochondria-associated membranes triggers disruption of mitochondrial calcium fluxes

引用

Food Science and Human Wellness 2024年第1期13卷 287-298页

作者： Hui liu Xuenan Li Ziyue Wang Lu Li Yucai Li Haiyang Yan yuan yuan College of Food Science and Engineering Jilin UniversityChangchun 130062China

Elaidic acid(EA)stimulation can lead to endoplasmic reticulum stress(ERS),accompanied by a large release of Ca^(2+),and ultimately the activation of NLRP3 inflammasome in Kupffer cells(KCs).Mitochondrial instability or dysfunction may be the key stimulating factors to activate NLRP3 inflammasome,and sustained Ca^(2+)transfer can result in mitochondrial *** focused on KCs to explore the damage to mitochondria by *** EA stimulation,cells produced an oxidative stress(OS)response with a significant increase in ROS *** experiments and the addition of inhibitors revealed that the increase in the level of intracellular Ca^(2+)led to Ca^(2+)accumulation in the mitochondrial matrix via mitochondria-associated membranes(MAMs).This was accompanied by a significant release of m ROS,loss of MMP and ATP,and a significant increase in mitochondrial permeability transition pore opening,ultimately leading to mitochondrial *** findings confirmed the mechanism that EA induced mitochondrial Ca^(2+)imbalance in KCs via MAM,ultimately leading to mitochondrial ***,EA induced OS and the decrease of MMP and ATP in rat liver,and significant lesions were found in liver *** of the inner mitochondrial cristae and mitochondrial vacuolization occurred,with a marked increase in lipid droplets.

关键词： Elaidic acid(EA) Mitochondria-associated membranes(MAMs) Calcium Endoplasmic reticulum Mitochondria dysfunction

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Management of regional citrate anticoagulation for continuous renal replacement therapy:guideline recommendations from Chinese emergency medical doctor consensus

引用

Military Medical Research 2023年第6期10卷 733-750页

作者： shu-yuan liu Sheng-Yong Xu Lu Yin Ting Yang Kui Jin Qiu-Bin Zhang Feng Sun Ding-Yu Tan Tian-Yu Xin Yu-Guo Chen Xiao-Dong Zhao Xue-Zhong Yu Jun Xu Emergency Medical Doctor Branch of the Chinese Medical Doctor Association Emergency Department The Sixth Medical CenterChinese PLA General HospitalBeijing 100048China State Key Laboratory of Complex Severe and Rare Diseases Emergency DepartmentPeking Union Medical College HospitalChinese Academy of Medical Science and Peking Union Medical CollegeBeijing 100730China Emergency Department Peking University Shenzhen HospitalShenzhen 518000China Emergency Department The First Affiliated Hospital of Kunming Medical UniversityKunming 650000China Emergency Department The First Affiliated Hospital of University of Science and Technology of ChinaHefei 230001China Emergency Department The Second Affiliated Hospital of Hainan Medical CollegeHaikou 570100China Emergency Department The First Affiliated Hospital of Nanjing Medical UniversityNanjing 210029China Emergency Depart‑ment Northern Jiangsu People’s HospitalClinical Medical College of Yang‑zhou UniversityYangzhou 225001China Emergency Department and Chest Pain Center Qilu Hospital of Shandong UniversityJinan 100005China Shandong Provincial Clinical Research Center for Emergency and Critical Care Medicine Jinan 100005China Key Laboratory of Emergency and Critical Care Medicine of Shandong Province Qilu Hospital of Shandong UniversityJinan 100005China Emergency Department The Fourth Medical CenterChinese PLA General HospitalBeijing 100048China Jiangxi Provincial People’s Hospital Nanchang330046China The Second Affiliated Hospital of Shenzhen University ShenzhenGuangdong 518035China The First Hos‑pital of Tsinghua University Beijing100016China The Affiliated Hospital and Medical School of Nantong University NantongJiangsu 226001China The First People’s Hospital of Lianyungang LianyungangJiangsu 222000China Shaanxi People’s Hospital Xi’an 710068China Renmin Hospital of Wuhan University Wuhan 430060China Shenzhen Hospital of South‑ern Medical University ShenzhenGuangdong 518000China The Second People’s Hospital of Huai’an Huai’anJiangsu 223002China The Affiliated Suqian Hospital of Xuzhou Medical Univers

Continuous renal replacement therapy(CRRT)is widely used for treating critically-ill patients in the emergency department in *** therapy is needed to prevent clotting in the extracorporeal circulation during *** citrate anticoagulation(RCA)has been shown to potentially be safer and more effective,and is now recommended as the preferred anticoagulant method for ***,there is still a lack of unified standards for RCA management in the world,and there are many problems in using this method in clinical *** Emergency Medical Doctor Branch of the Chinese Medical Doctor Association(CMDA)organized a panel of domestic emergency medicine experts and international experts of CRRT to discuss RCA-related issues,including the advantages and disadvantages of RCA in CRRT anticoagulation,the principle of RCA,parameter settings for RCA,monitoring of RCA(mainly metabolic acid-base disorders),and special issues during *** on the latest available research evidence as well as the paneled experts'clinical experience,considering the generalizability,suitability,and potential resource utilization,while also balancing clinical advantages and disadvantages,a total of 16 guideline recommendations were formed from the experts'consensus.

关键词： Continuous renal replacement therapy Emergency Anticoagulation Citrate Guideline Expert consensus

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Creep property and microstructural evolution of DD11 alloy under high temperature and low stress

引用

Rare Metals 2024年第2期43卷 810-816页

作者： Yan-Fei liu Jiang-Bo Sha Yun-Song Zhao Chen-Guang liu yuan-yuan Guo Jian Zhang Yu-Shi Luo School of Materials Science and Engineering Beihang UniversityBeijing100191China Science and Technology on Advanced High Temperature Structural Materials Laboratory Beijing Institute of Aeronautical MaterialsBeijing100095China

In this paper,the interrupted and ruptured creep tests were carried out in a novel second generation single crystal superalloy named DD11 at 1100℃/130 *** alloy exhibited typical creep curve including primary,steady,and tertiary three creep *** microstructural evolution at different stages of the creep were analyzed by scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The results show that theγ′phases transform into rafted structure at the early stage of the steady creep and keep stable during the steady creep *** the creep goes on,the rafted structure further coarsens and the topological inversion *** addition,at the primary creep,the dislocations mainly move in theγmatrix and pile up in theγ/γ′interface since the matrix channels widen *** formation of the regular interfacial dislocation networks occurs at the early stage of the steady *** the low stress,the dominated deformation mechanism during steady creep stage is the climbing of the〈010〉type edge ***,the effect of the deformation mechanism on creep property was discussed in detail.

关键词： DD11 alloy Creep property Interrupted creep test Rafted structure Deformation mechanism

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Gamma/Hadron Separation Method for the HADAR Experiment

引用

Research in Astronomy and Astrophysics 2024年第3期24卷 70-74页

作者： Yang-Zhao Ren Tian-Lu Chen You-Liang Feng Dan-Zeng Luo-Bu Yi-Qing Guo Cheng liu Qi Gao Mao-yuan liu Xiang-Li Qian Ya-Ping Wang Zi-Hao Zhang Xin-Long Li Qing-yuan Hou Heng-Jiao liu Qing-Qian Zhou Shan-Jie shu The Key Laboratory of Cosmic Rays(Tibet University) Ministry of EducationLhasa 850000China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of Sciences University of Chinese Academy of Sciences School of Intelligent Engineering Shandong Management University

Ground-based arrays of imaging atmospheric Cherenkov telescopes(IACTs)are the most sensitiveγ-ray detectors for energies of approximately 100 Ge V and *** such IACT is the High Altitude Detection of Astronomical Radiation(HADAR)experiment,which uses a large aperture refractive water lens system to capture atmospheric Cherenkov photons(i.e.,the imaging atmospheric Cherenkov technique).The telescope array has a low threshold energy and large field of view,and can continuously scan the area of the sky being observed,which is conducive to monitoring and promptly responding to transient *** process ofγ-hadron separation is essential in very-high-energy(>30 Ge V)γ-ray astronomy and is a key factor for the successful utilization of *** this study,Monte Carlo simulations were carried out to model the response of cosmic rays within the HADAR *** analyzing the Hillas parameters and the distance between the event core and the telescope,the distinction between air showers initiated byγ-rays and those initiated by cosmic rays was ***,a Quality Factor was introduced to assess the telescope’s ability to suppress the background and to provide a more effective characterization of its performance.

关键词： astroparticle physics-telescopes-methods data analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Microglia in brain aging:An overview of recent basic science and clinical research developments

引用

Journal of Biomedical Research 2024年第2期38卷 122-136页

作者： Haixia Fan Minheng Zhang Jie Wen Shengyuan Wang Minghao yuan Houchao Sun liu shu Xu Yang Yinshuang Pu Zhiyou Cai Chongqing Medical University Chongqing 400042China Department of Neurology Chongqing General HospitalChongqing 400013China Chongqing Key Laboratory of Neurodegenerative Diseases Chongqing 400013China Department of Neurology the First Hospital of Shanxi Medical UniversityTaiyuanShanxi 030001China Department of Gerontology the First People's Hospital of JinzhongJinzhongShanxi 030009China

Aging is characterized by progressive degeneration of tissues and organs,and it is positively associated with an increased mortality *** brain,as one of the most significantly affected organs,experiences age-related changes,including abnormal neuronal activity,dysfunctional calcium homeostasis,dysregulated mitochondrial function,and increased levels of reactive oxygen *** changes collectively contribute to cognitive *** is also a key risk factor for neurodegenerative diseases,such as Alzheimer's disease and Parkinson's *** many years,neurodegenerative disease investigations have primarily focused on neurons,with less attention given to microglial ***,recently,microglial homeostasis has emerged as an important mediator in neurological disease ***,we provide an overview of brain aging from the perspective of the *** doing so,we present the current knowledge on the correlation between brain aging and the microglia,summarize recent progress of investigations about the microglia in normal aging,Alzheimer's disease,Parkinson's disease,Huntington's disease,and amyotrophic lateral sclerosis,and then discuss the correlation between the senescent microglia and the brain,which will culminate with a presentation of the molecular complexity involved in the microglia in brain aging with suggestions for healthy aging.

关键词： microglia brain aging Alzheimer's disease Parkinson's disease Huntington's disease

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Prediction for permeability index of blast furnace based on VMD-PSO-BP model

引用

Journal of Iron and Steel Research(International) 2024年第3期31卷 573-583页

作者： Xiao-jie liu Yu-jie Zhang Xin Li Zhi-feng Zhang Hong-yang Li Ran liu shu-jun Chen School of Metallurgy and Energy North China University of Science and TechnologyTangshan 063210HebeiChina Chengde Branch HBIS Group Co.Ltd.Chengde 067000HebeiChina

The permeability index is one of the important production indicators to monitor the operation of blast *** is crucial to grasp the trends of changes in the new permeability index in *** the complex vibration spectrum of the permeability index,a prediction model of the permeability index based on the VMD-PSO-BP(variational mode decomposition-particle swarm optimization-back propagation)method was ***,the key factors that affect the permeability index of blast furnace were studied from multiple ***,the permeability index was divided into multiple sub-modes based on the difference of frequency bands by the VMD algorithm,and a PSO-BP prediction model was established for each ***,the prediction results of each sub-mode were summed to obtain the final *** results show that the composite prediction accuracy by using the VMD algorithm is 3%higher than that of the traditional prediction method,which has better applicability.

关键词： Big data-Blast furnace Air permeability Variational mode decomposition Particle swarm optimization Back propagation Model prediction

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Multi-stimuli-responsive aggregation-induced emission copper iodide cluster

引用

Science China Chemistry 2024年第4期67卷 1193-1197页

作者： Bo Li yuan-yuan liu Peng Luo Ye-Ru liu Ying-Jun Chen Kai Li shuang-Quan Zang College of Chemistry and Pharmacy Engineering Nanyang Normal UniversityNanyang 473061China Green Catalysis Center and College of Chemistry Zhengzhou UniversityZhengzhou 450001China

Stimuli-responsive luminescent materials have attracted significant attention in the development of smart photoactive materials for both fundamental research and technological *** this work,a new copper iodide cluster(1)with aggregationinduced emission(AIE)characteristic,was obtained combining Cu_(4)I_(4) core with rhodamine B derivative ligand.1 has reversible and distinct multi-stimuli-responsive luminescence for external temperature,volatile organic compound,and mechanical ***,1 exhibited unusual large blue shift(84 nm)after being ground,which originated from the change of intermolecular ***,1 exhibits high oxygen quenching efficiency for 82.2% at 1 *** studies showed that the multi-stimuli-responsive luminescence properties of 1 can be attributed to the regulation of cluster-centered luminescence process,metal-to-ligand charge transfer process,halide-to-metal charge transfer luminescence process and aggregationinduced barrier to oxygen *** work not only reports an AIE copper iodide cluster,but also provides a new strategy to develop multi-stimuli-responsive luminescence materials.

关键词： copper iodide cluster aggregation-induced emission multi-stimuli-response

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：