检索结果-南通市图书馆

Strength-Toughening Model of Eutectic Ceramic Composite with Inherent Defects

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2014年第4期27卷 754-760页

作者： FU Yunwei ZHANG Long NI Xinhua LIU Xiequan CHEN Cheng zhao siyuan Department of Vehicle and Electric Engineering Ordnance Engineering College Department of Ground Artillery Wuhan Ordnance Non-commissioned Officers Academy

Strengthening and toughening mechanisms in composite ceramics is complex. A change in a single parameter induces multiple property variations. The multiple changes in properties are often incompletely represented in theoretical models. This incompleteness in the parameter chosen fails to explain the mechanism of failure in composite ceramics. The exponential toughness function is used to represent the pull-out toughening mechanism, which dominates the crack growth resistance curve（R-curve）. The strengthening-toughening model is established based on the Mori-Tanaka method（M-T method）. The influence of inherent defects on toughness function and strength is analyzed by using this model. The theoretical result is compared with the experiment data. This model exactly reflects the change in strength. The theoretical result indicates that defects change the toughness function. Moreover, micro-cracks increase toughness size ac, and the strength of crack instable extensions acutely decreases as defect content increases. This presented model establishes the relationship among the important mechanical parameters of defect, strength, elastic modulus, and the R-curve.

关键词： inherent defects pull-out toughening toughness function strength

Application of modified discontinuous deformation analysis to dynamic modelling of the Baige landslide in the Jinsha River

在线全文

学校读者我要写书评

暂无评论

Journal of Mountain Science 2024年第7期21卷 2305-2319页

作者： XIE Chenxi DENG Jianhui PENG Xinyan YANG Zhongkang zhao siyuan LI Hua State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610031China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu 610051China MOE Key Laboratory of Deep Earth Science and Engineering Institute for Disaster Management and ReconstructionSichuan UniversityChengdu 610031China Power China Chengdu Engineering Corporation Limited Chengdu 610031China

Accurate dynamic modeling of landslides could help understand the movement mechanisms and guide disaster mitigation and *** deformation analysis(DDA)is an effective approach for investigating ***,DDA fails to accurately capture the degradation in shear strength of rock joints commonly observed in high-speed *** this study,DDA is modified by incorporating simplified joint shear strength *** on the modified DDA,the kinematics of the Baige landslide that occurred along the Jinsha River in China on 10 October 2018 are *** violent starting velocity of the landslide is considered *** cases with different violent starting velocities are investigated to show their effect on the landslide movement ***,the landslide movement process and the final accumulation characteristics are analyzed from multiple *** results show that the violent starting velocity affects the landslide motion characteristics,which is found to be about 4 m/s in the Baige *** movement process of the Baige landslide involves four stages:initiation,high-speed sliding,impact-climbing,low-speed motion and *** accumulation states of sliding masses in different zones are different,which essentially corresponds to *** research results suggest that the modified DDA is applicable to similar high-level rock landslides.

关键词： Discontinuous deformation analysis(DDA) Baige landslide Violent starting velocity movement process Accumulation characteristics

Sorafenib inhibits ossification of the posterior longitudinal ligament by blocking LOXL2-mediated vascularization

在线全文

学校读者我要写书评

暂无评论

Bone Research 2024年第2期12卷 372-389页

作者： Longqing Wang Wenhao Jiang siyuan zhao Dong Xie Qing Chen Qi zhao Hao Wu Jian Luo Lili Yang Spine Center Department of OrthopaedicsShanghai Changzheng HospitalSecond Affiliated Hospital of Naval Medical UniversityShanghai 200003PR China Yangzhi Rehabilitation Hospital(Shanghai Sunshine Rehabilitation Center) Tongji University School of MedicineShanghaiPR China Shanghai Key Laboratory of Regulatory Biology Institute of Biomedical Sciences and School of Life SciencesEast China Normal UniversityShanghaiPR China Department of Orthopaedics No.905 Hospital of PLA NavyShanghaiPR China

Ossification of the Posterior Longitudinal Ligament(OPLL)is a degenerative hyperostosis disease characterized by the transformation of the soft and elastic vertebral ligament into bone,resulting in limited spinal mobility and nerve *** both bulk and single-cell RNA sequencing,we elucidate the molecular characteristics,cellular components,and their evolution during the OPLL process at a single-cell resolution,and validate these findings in clinical *** study also uncovers the capability of ligament stem cells to exhibit endothelial cell-like phenotypes in vitro and in ***,our study identifies LOXL2 as a key regulator in this *** gain-and loss-of-function studies,we elucidate the role of LOXL2 in the endothelial-like differentiation of ligament *** acts via the HIF1A pathway,promoting the secretion of downstream VEGFA and *** function is not related to the enzymatic activity of ***,we identify sorafenib,a broad-spectrum tyrosine kinase inhibitor,as an effective suppressor of LOXL2-mediated vascular *** disrupting the coupling between vascularization and osteogenesis,sorafenib demonstrates significant inhibition of OPLL progression in both BMP-induced and enpp1 deficiency-induced animal models while having no discernible effect on normal bone *** findings underscore the potential of sorafenib as a therapeutic intervention for OPLL.

关键词： LOXL2 ligament finding

Catalytic hosts with strong adsorption strength for long shelf-life lithium-sulfur batteries under lean electrolyte

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第1期16卷 427-438页

作者： siyuan zhao Huayu Pei Quan Yang Kangli Liu Yuanyuan Huang Zhuo Wang Guosheng Shao Jinping Liu Junling Guo State Center for International Cooperation on Designer Low-carbon&Environmental Materials School of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450001China Zhengzhou Materials Genome Institute Xingyang 450100China School of Chemistry Chemical Engineering and Life ScienceState Key Laboratory of Advanced Technology for Materials Synthesis and ProcessingWuhan University of TechnologyWuhan 430070China

Low electrolyte/sulfur ratio(E/S)is an important factor in increasing the energy density of lithium-sulfur batteries(LSBs).Recently,the E/S has been widely lowered using catalytic hosts that can suppress“shuttle effect”during cycling by relying on a limited adsorption ***,the shelf-lives of these cathodes have not yet received ***,we show that the selfdischarge of sulfur cathodes based on frequently-used catalytic hosts is serious under low E/S because the“shuttle effect”during storage process caused by polysulfides(PSs)disproportionation cannot be suppressed using a limited adsorption *** further prove that the adsorption strength toward PSs,which is unfortunately weak in commonly-used catalytic hosts,is critical for effectively hindering the disproportionation of the ***,to verify this conclusion,we prepare a sulfur-doped titanium nitride(S-TiN)catalytic array *** the adsorption strength and catalytic activity of TiN can be improved by S doping simultaneously,the constructed S/S-TiN cathodes under a low E/S(6.5μL·mg−1)exhibit better shelf-life and cycle-stability than those of S/TiN *** work suggests that enhancing the adsorption strength of catalytic hosts,while maintaining their function to reduce E/S,is crucial for practical LSBs.

关键词： lithium-sulfur battery low electrolyte/sulfur ratio(E/S) self-discharge catalytic host adsorption strength

Flood assessment and early warning of the reoccurrence of river blockage at the Baige landslide

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

Journal of Geographical Sciences 2021年第11期31卷 1694-1712页

作者： GAO Yunjian zhao siyuan DENG Jianhui YU Zhiqiu RAHMAN Mahfuzur State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China Key Lab of Mountain Hazards and Surface Processes Institute of Mountain Hazards and EnvironmentCASChengdu 610041China

On 10th *** 3rd Nov.2018,two successive landslides occurred in the Jinsha River catchment at Baige Village,Tibet Autonomous Region,*** landslides blocked the major river and formed the barrier lake,which finally caused the huge flood disaster *** hillslope at Baige landslide site has been still deforming after the 2018 slidings,which is likely to fail and block the Jinsha River again in the *** the investigation of 2018 flood disaster at the Baige landslide is of a great significance to provide a classic case for flood assessment and early warning for the future *** detailed survey revealed that the outstanding inundations induced bank collapse disasters upstream the Baige landslide dams,and the field investigations and hydrological simulation suggested that the downstream of the Baige landslide were seriously flooded due to the two periods of the outburst *** these bases,the early warning process of potential outburst floods at the Baige landslide was advised,which contains four stages:Outburst Flood Simulating Stage,Outburst Flood Forecasting Stage,Emergency Plan and Emergency Evacuation *** study offers a conceptual model for the mitigation of landslides and flood disasters in the high-relief mountain-ous region in Tibet.

关键词： Baige landslide outburst flood flood assessment flood early warning HFX-RAS

Tailoring structural properties of carbon via implanting optimal co nanoparticles in n-rich carbon cages toward high-efficiency oxygen electrocatalysis for rechargeable zn-air batteries

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2022年第4期4卷 576-585页

作者： Jie Yu Yawen Dai Zhenbao Zhang Tong Liu siyuan zhao Chun Cheng Peng Tan Zongping Shao Meng Ni Department of Building and Real Estate The Hong Kong Polytechnic UniversityKowloonHong KongChina Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefeiAnhuiChina State Key Laboratory of Materials-Oriented Chemical Engineering Department of Chemical EngineeringCollege of Chemical EngineeringNanjing Tech UniversityNanjingChina Department of Chemical Engineering Curtin UniversityPerthWestern AustraliaAustralia

Rational construction of carbon-based materials with high-efficiency bifunctionality and low cost as the substitute of precious metal catalyst shows a highly practical value for rechargeable Zn-air batteries(ZABs)yet it still remains ***,this study employs a simple mixing-calcination strategy to fabricate a high-performance bifunctional composite catalyst composed of N-doped graphitic carbon encapsulating Co nanoparticles(Co@NrC).Benefiting from the core-shell architectural and compositional advantages of favorable electronic configuration,more exposed active sites,sufficient electric conductivity,rich defects,and excellent charge transport,the optimal Co@NrC hybrid(Co@NrC-0.3)presents outstanding catalytic activity and stability toward oxygen-related electrochemical reactions(oxygen reduction and evolution reactions,i.e.,ORR and OER),with a low potential gap of 0.766 ***,the rechargeable liquid ZAB assembled with this hybrid electrocatalyst delivers a high peak power density of 168 mW cm^(−2),a small initial discharge-charge potential gap of 0.45 V at 10 mA cm^(−2),and a good rate ***,a relatively large power density of 108 mW cm^(−2) is also obtained with the Co@NrC-0.3-based flexible solid-state ZAB,which can well power LED *** work offers insights in developing excellent bifunctional electrocatalysts for both OER and ORR and highlights their potential applications in metal-air batteries and other energy-conversion/storage devices.

关键词： Co nanoparticles core-shell nanostructure N-doped graphitic carbon oxygen electrocatalysis Zn-air battery

AI-enabled materials discovery for advanced ceramic electrochemical cells

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

Energy and AI 2024年第1期15卷 55-87页

作者： Idris Temitope Bello Ridwan Taiwo Oladapo Christopher Esan Adesola Habeeb Adegoke Ahmed Olanrewaju Ijaola Zheng Li siyuan zhao Chen Wang Zongping Shao Meng Ni Department of Building and Real Estate Research Institute for Sustainable Urban Development(RISUD)&Research Institute for Smart Energy(RISE)The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina Department of Civil Engineering University of JohannesburgSouth Africa Department of Mechanical Engineering Wichita State UniversityKansasUSA WA School of Mines:Minerals Energy and Chemical EngineeringCurtin UniversityPerthWestern Australia6845Australia

Ceramic electrochemical cells(CECs)are promising devices for clean and efficient energy conversion and storage due to their high energy efficiency,more extended system durability,and less expensive ***,the search for suitable materials with desired properties,including high ionic and electronic conductivity,thermal stability,and chemical compatibility,presents ongoing challenges that impede widespread adoption and further advancement in the *** intelligence(AI)has emerged as a versatile tool capable of enhancing and expediting the materials discovery cycle in CECs through data-driven modeling,simulation,and optimization ***,we comprehensively review the state-of-the-art AI applications for materials design and optimization for CECs,covering various material aspects,database construction,data pre-processing,and AI *** also present some representative case studies of AI-predicted and synthesized materials for CECs and provide insightful highlights about their *** emphasize the main implications and contributions of the AI approach for advancing the CEC technology,such as reducing the trial-and-error experiments,exploring the vast materials space,discovering novel and optimal materials,and enhancing the understanding of the materials-performance *** also discuss the AI approach’s main limitations and future directions for CECs,such as addressing the data and model challenges,improving and extending the AI models and methods,and integrating with other computational and experimental *** conclude by suggesting some potential applications and collaborations for AI in materials design for CECs.

关键词： Ceramic electrochemical cells Artificial intelligence Materials design Materials optimization Materials performance Machine learning

知识、册籍、组织:19世纪60年代苏南田赋征收体系的重建

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

中国经济史研究 2023年第2期 18-31页

作者：赵思渊上海交通大学人文学院历史系上海200240

经过一条鞭法之后的一系列赋役改革,清代前期苏南地区形成了总书、图差、里书构成的三级税粮催征体系。这一组织体系负责编纂赋役册籍,掌握有关赋役制度的知识,实际上主导着州县层级的田赋征收。这种制度运行成为地方政治的核心议题,也... 详细信息

经过一条鞭法之后的一系列赋役改革,清代前期苏南地区形成了总书、图差、里书构成的三级税粮催征体系。这一组织体系负责编纂赋役册籍,掌握有关赋役制度的知识,实际上主导着州县层级的田赋征收。这种制度运行成为地方政治的核心议题,也蕴含着一系列社会矛盾。太平天国运动中,战争造成了税粮催征体系的人员死亡与册籍流散,也刺激了社会矛盾的爆发,苏南的税粮催征组织陷入瘫痪。太平天国战后,李鸿章、冯桂芬等人推动减赋,随后丁日昌主政期间,着力于恢复地方社会秩序。这一过程中,税粮催征体系日渐活跃,重建赋役册籍,重新吸纳战前的赋役制度知识,成为这一时期地方政治的特征。由税粮催征体系引发的社会矛盾也重新成为地方政治的议题。

关键词：赋役制度减赋太平天国社会秩序赋税包揽

在线全文

学校读者我要写书评

暂无评论

“政治之事”与清代江南的地方治理

清史研究 2024年第4期 129-137页

作者：赵思渊上海交通大学历史系上海200240

什么是清代官场语境中的“政治”?有关日常行政的具体事务,可能构成了清代官场语境中“政治”这一概念的实质内容。清代影响最广远的官箴书《福惠全书》在开篇即声明:“夫是书也,乃政治之事也。”(1)这种“政治之事”的具体内涵则是《... 详细信息

什么是清代官场语境中的“政治”?有关日常行政的具体事务,可能构成了清代官场语境中“政治”这一概念的实质内容。清代影响最广远的官箴书《福惠全书》在开篇即声明:“夫是书也,乃政治之事也。”(1)这种“政治之事”的具体内涵则是《福惠全书》所论列的筮仕、莅任、钱谷、编审、清丈、刑名、保甲、典礼、教养、庶政、升迁等具体的行政实务。这种观念并非黄六鸿一人凭空而起的论断。明末清初是经世观念的一个高潮,陈子龙、顾炎武、陆世仪等人构造了经世之学的思想框架,其中“治法”的传统即强调如何进行政治制度与政府政策的安排。

关键词：陈子龙清代江南陆世仪经世之学顾炎武思想框架实质内容官箴书