检索结果-南通市图书馆

Quantitative Evaluation of Ecological Cumulative Effects and Zoning Regulations for Prefectural Mining Units in China

在线全文

学校读者我要写书评

暂无评论

Chinese Geographical Science 2022年第1期32卷 49-63页

作者： MA Li kang Lei TIAN Huazheng xu Die Institute of Geographic Sciences and Nature Resources Research Chinese Academy of SciencesBeijing 100101China Key Laboratory of Regional Sustainable Development Modeling Chinese Academy of SciencesBeijing 100101.China College of Resources ancl Environment University of Chinese Academy of SciencesBeijing 100049China

Although the development of energy and mineral resources strongly supports China’s rapid industrialization and urbanization,it has led to a series of ecological and environmental *** the spatial regulation considering the ecological and environmental protection on energy and mineral resource development areas is an important aspect of realizing China’s sustainable *** this study,we mapped,categorized,and analyzed the ecological cumulative effects of the Chinese 134 prefectural mining units based on the pressure-state-response model,which is demonstrated as impact of mining activities on ecological environment,ecological environmental fragility,and ecological *** investigation developed a stress zoning typology of the mining units based on scores of three dimensions of the ecological cumulative effects and classified 134 prefectural mining units into eight types of stress zones.A series of regulation and policy suggestions have been proposed to different types of zones from three aspects:space control,intensity control,and development mode *** application of this evaluation and spatial zoning system will contribute to the refined spatial management of China’s mining areas.

关键词： ecological cumulative effects quantitative evaluation pressure-state-response model zoning

Thermal- and Light-driven Metathesis Reactions Between Different Diselenides

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2022年第2期38卷 516-521页

作者： kang Xiaoying YUAN Yuan xu Huaping CHEN Yulan Tianjin Key Laboratory of Molecular Optoelectronic Science Department of ChemistryTianjin UniversityTianjin 300354P.R.China Key Laboratory of Organic Optoelectronics and Molecular Engineering Department of ChemistryTsinghua UniversityBeijing 100084P.R.China

Thermal- and light-driven diselenide metathesis reactions with different types of diselenides are investigated systematically. Their exchange reaction rates and equilibrium conversions are compared in the aspects of the different diselenide structures, activation conditions and solvents. As a result, the metathesis reactions between diselenide small molecules are demonstrated with high dynamic and sensitive features, which can be broadly tuned by varying the electron affinity and aromaticity of the diselenide substituents and external conditions(e.g., solvent, stimulus mode). The current work thus will not only advance our understanding on diselenide metathesis chemistry, but also promote concrete and impactful studies in selenium-containing materials.

关键词： Dynamic covalent bond Metathesis Diselenide

Mechanical behaviors of coal measures and ground control technologies for China's deep coal mines-A review

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 Rock Mechanics and Geotechnical Engineering 2023年第1期15卷 37-65页

作者： Hongpu kang Fuqiang Gao Gang xu Huaiwei Ren CCTEG Coal Mining Research Institute BeijingChina Coal Mining Branch China Coal Research InstituteBeijingChina State Key Laboratory of Coal Mining and Clean Utilization China Coal Research InstituteBeijingChina

This paper reviews the major achievements in terms of mechanical behaviors of coal measures,mining stress distribution characteristics and ground control in China’s deep underground coal *** three main aspects of this review are coal measure mechanics,mining disturbance mechanics,and rock support *** studies related to these three topics are reviewed,including the geo-mechanical properties of coal measures,distribution and evolution characteristics of mining-induced stresses,evolution characteristics of mining-induced structures,and principles and technologies of ground control in both deep roadways and longwall faces.A discussion is made to explain the structural and mechanical properties of coal measures in China’s deep coal mining practices,the types and dis-tribution characteristics of in situ stresses in underground coal mines,and the distribution of mining-induced stress that forms under different geological and engineering *** theory of pre-tensioned rock bolting has been proved to be suitable for ground control of deep underground coal *** use of combined ground control technology(*** support,rock mass modification,and destressing)has been demonstrated to be an effective measure for rock control of deep *** developed hydraulic shields for 1000 m deep ultra-long working face can effectively improve the stability of surrounding rocks and mining efficiency in the longwall *** ground control challenges in deep underground coal mines in China are discussed,and further research is recommended in terms of theory and technology for ground control in deep roadways and longwall faces.

关键词： Deep underground coal mine Mechanical behavior Mining-induced stress Mining-induced fractures Ground control for roadways Ground control for working face

NANOFIBROUS MATS WITH BIRD'S NEST PATTERNS BY ELECTROSPINNING

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

Chinese Journal of Polymer Science 2012年第1期30卷 130-137页

作者： Xiang-yu Ye Xiao-jun Huang Zhi-kang xu MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China

Electrospun material with bio-inspired ordered architectures and patterns is very interesting,yet remains a *** report here that nanofibrous mats with bird＇s nest patterned structures can be directly electrospun from chlorinated polypropylene solutions doped with an ionic *** solution viscosity and the ionic liquid content are two dominant factors to influence the topological morphology of the nanofibrous *** patterned structures can be further modulated by the collection time of electrospinning,the humidity of environment and the design of *** suggest the electrostatic repulsion between the residual charges of the mat surface and the upcoming nanofibers plays a key role in the formation of the bird＇s nest patterns.

关键词： Electrospinning Ionic liquid Patterned structures

Model-Based Network Scheduling and Control for Systems over the IEEE 802.15.4 Network

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2021年第1期34卷 281-297页

作者： ZHAO Yunbo xu Deheng HE Jiangtao XI xugang kang Yu College of Information Engineering Zhejiang University of TechnologyHangzhou 310023China School of Automation Hangzhou Dianzi UniversityHangzhou 310018China Department of Automation University of Science and Technology of ChinaHefei 230027China

The scheduling and control of a class of wireless networked control system is investigated,whose control loop is closed via a shared IEEE 802.15.4 wireless network. By using a gain scheduler within the packet-based control framework and fitting the delay-dependent gains into a time-delay system model, a less conservative self-triggered approach is proposed to determine the sampling update,which consequently enables the design of two network scheduling algorithms to reduce the communication usage. Numerical and TrueT ime based examples illustrate the effectiveness of the proposed approach in the sense that it reduces greatly the communication usage while maintaining satisfactory control performance.

关键词： IEEE 802.15.4 packet-based control scheduling wireless networked control system

Recent progress onmicrofluidic devices with incorporated 1D nanostructures for enhanced extracellular vesicle(EV)separation

在线全文

学校读者我要写书评

暂无评论

Bio-Design and Manufacturing 2022年第3期5卷 607-616页

作者： Yuting Xiong Hanyue kang Hongzhao Zhou Liang Ma Xiaobin xu Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education Shanghai Key Lab of D&A for Metal-Functional MaterialsSchool of Materials Science and EngineeringTongji UniversityShanghai 201804China Institute for Advanced Study Tongji UniversityShanghai 201804China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310058China School of Mechanical Engineering Zhejiang UniversityHangzhou 310058China

Extracellular vesicles(EVs)are lipid-bound vesicles secreted by cells into the extracellular *** are three types of EVs,including exosomes(30–150 nm)[1],microvesicles(100–1000 nm),and apoptotic bodies(50–4000 nm).EVs are also important intercellular communication carriers in many physiological and pathological processes such as immune response,tumor invasion,and metastasis[2,3].EVs circulate in various body fluids(e.g.,peripheral blood and urine),while carrying genetic information(e.g.,proteins and nucleic acids)from the parent cells[2,4,5].Thus,their source can be identified through gene analysis[6–10].

关键词： invasion urine metastasis

A Line Complex-Based Evolutionary Algorithm for Many-Objective Optimization

在线全文

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2023年第5期10卷 1150-1167页

作者： Liang Zhang Qi kang Qi Deng Luyuan xu Qidi Wu the Department of Control Science and Engineering Tongji UniversityShanghai 201804 the Jiangsu Province Support Software Engineering R&D Center for Modern Information Technology Application in Enterprise Suzhou 215104China the Shanghai Institute of Intelligent Science and Technology Tongji UniversityShanghai 200092China

In solving many-objective optimization problems(MaO Ps),existing nondominated sorting-based multi-objective evolutionary algorithms suffer from the fast loss of selection *** candidate solutions become nondominated during the evolutionary process,thus leading to the failure of producing offspring toward Pareto-optimal front with *** we find a more effective way to select nondominated solutions and resolve this issue?To answer this critical question,this work proposes to evolve solutions through line complex rather than solution points in Euclidean ***,Plücker coordinates are used to project solution points to line complex composed of position vectors and momentum *** position vectors of the solution points,momentum vectors are used to extend the comparability of nondominated solutions and enhance selection ***,a new distance function designed for high-dimensional space is proposed to replace Euclidean distance as a more effective distancebased *** on them,a novel many-objective evolutionary algorithm(MaOEA)is proposed by integrating a line complex-based environmental selection strategy into the NSGAⅢ*** proposed algorithm is compared with the state of the art on widely used benchmark problems with up to 15 *** results demonstrate its superior competitiveness in solving MaOPs.

关键词： Environmental selection line complex many-objective optimization problems(MaOPs) Plücker coordinate

Gas Generation Mechanism in Li-Metal Batteries

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2022年第1期5卷 327-336页

作者： Huajun Zhao Jun Wang Huaiyu Shao kang xu Yonghong Deng Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices Department of Materials Science and EngineeringAcademy for Advanced Interdisciplinary StudiesSouthern University of Science and TechnologyShenzhen 518055China Energy Storage Branch US Army Research LaboratoryAdelphi MD 20783USA Joint Key Laboratory of the Ministry of Education Institute of Applied Physics and Materials EngineeringUniversity of MacaoAvenida da UniversidadeTaipa Macao SAR China

Gas generation induced by parasitic reactions in lithium-metal batteries(LMB)has been regarded as one of the fundamental barriers to the reversibility of this battery chemistry,which occurs via the complex interplays among electrolytes,cathode,anode,and the decomposition species that travel across the *** this work,a novel in situ differential electrochemical mass spectrometry is constructed to differentiate the speciation and source of each gas product generated either during cycling or during storage in the presence of cathode chemistries of varying structure and nickel *** unambiguously excludes the trace moisture in electrolyte as the major source of hydrogen and convincingly identifies the layer-structured NCM cathode material as the source of instability that releases active oxygen from the lattice at high voltages when NCM experiences H2→H3 phase transition,which in turn reacts with carbonate solvents,producing both CO_(2)and proton at the cathode *** proton in solvated state travels across the cell and becomes the main source for hydrogen generated at the anode *** are proposed to account for these irreversible reactions,and two electrolyte additives based on phosphate structure are adopted to mitigate the gas generation based on the understanding of the above decomposition chemistries.

关键词： differential electrochemical mass spectrometry gas evolution lithium metal lithium nickel cobalt manganese oxide oxygen release

Aqueous lithium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2021年第5期3卷 721-751页

作者： Arthur von Wald Cresce kang xu US Army Research Laboratory AdelphiMarylandUSA

Aqueous electrolytes were once the rule for the battery *** the advent of lithium ion batteries,a majority of commercially relevant batteries utilized water as the solvent for ion *** development of the intercalation-based lithium ion battery upended the industrial aqueous electrolyte paradigm:the high energy density of the lithium-ion battery was revolutionary but required the use of organic electrolytes capable of passivating strongly redox active *** the safety of organic electrolytes becoming an issue in the early 1990s,a small community re-examined aqueous electrolytes for lithium ion *** first such audacious attempt was by Dahn et al.,who conceptualized an aqueous lithium-ion battery chemistry based on electrode materials suitable for the narrow electrochemical stability window of water,sacrificing energy density and cycle life for safety and low *** concept of an aqueous lithium-ion battery was revived in the mid-2010s with“highly concentrated”electrolytes,expanding the electrochemical stability window of water to regions comparable with nonaqueous *** then,significant efforts have been made around the world,aiming to understand the nature of the interfacial stability in those highconcentration electrolytes as well as to further make the system viable for practical *** review summarizes these efforts in this emerging frontier of new battery chemistries.

关键词： aqueous batteries interfaces lithium ion safety stability