检索结果-南通市图书馆

Bending-induced extension in two-dimensional crystals

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2017年第1期33卷 71-76页

作者： Douxing Pan Yao Li tzu-chiang wang Wanlin Guo State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Mechanics and Control for Mechanical Structures and Key Laboratory for Intelligent Nano Materials and Devices (MOE) Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

We find by ab initio simulations that significant overall tensile strain can be induced by pure bending in a wide range of two-dimensional crystals perpendicular to the bending moment, just like an accordion being bent to open. This bending-induced tensile strain increases in a power law with bent curvature and can be over 20% in monolayered black phosphorus and transition metal dichalcogenides at a moderate curvature of but more than an order weaker in graphene and hexagon boron nitride. This accordion effect is found to be a quantum mechanical effect raised by the asymmetric response of chemical bonds and electron density to the bending curvature.

关键词： Monolayer black phosphorus Bending to extension Accordion effect Density functional theory

STRATIGRAPHY AND PALAEONTOLOGY OF FUSHUN COAL-FIELD, LIAONING PROVINCE

在线全文

学校读者我要写书评

暂无评论

地质学报 1974年第2期 145-149页

作者： HONG YOU-CHONG YANG tzu-chiang wang SHIH-TAO wang SZU-EN LI YU-KUEI SUN MENG-RUNG SUN HSIANG-CHUN TU NAI-CHIU

I. Stratigraphic Subdivisions of the Fushun Coal-field are given as follows: All the fossil insects described in this paper were collected from the ambers of the

关键词： length LIAONING PROVINCE STRATIGRAPHY AND PALAEONTOLOGY OF FUSHUN COAL-FIELD Text very wang PI

A DESIGN FOR ENVIRONMENT METHODOLOGY FOR EVALUATION AND IMPROVEMENT OF DERIVATIVE CONSUMER ELECTRONIC PRODUCT DEVELOPMENT

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2011年第3期20卷 260-274页

作者： tzu-An chiang Z.H.CHE Tung-Te wang Department of Business Administration National Taipei College of Business Department of Industrial Engineering & Management National Taipei University of Technology

Increasing environmental awareness and stringent environmental regulations have motivated many companies to incorporate ecodesign into product development. To assist companies to address the challenge, this research presents a design for environment （DfE） methodology to evaluate and improve derivative consumer electronic product development using a back-propagation neural network （BPNN） model and a technique for order preference by similarity to ideal solution （TOPSIS） method. Based on use of a BPNN, the life cycle assessment （LCA） models are developed to estimate quantities of hazardous chemical substances and energy consumption for a derivative consumer electronic product throughout the product life cycle. A performance evaluation and improvement model for DfE is then devised based on the TOPSIS method to analyze the ecodesign performance and provide concrete improvement strategies. With the aforementioned analysis of environmental performance, an enterprise can profoundly understand and significantly enhance the relative DfE performance of a new product compared to the similar competitive products. Finally, we apply an optical mouse development project as a case to elaborate and demonstrate the effectiveness of the proposed methodology. These analytical results can let us understand the DfE performance ranking and acquire the maximum reduced quantity of each DfE criterion for each module of a new product. Meanwhile, to enhance the green competitiveness of the new product, we recommend that the engineers should decrease the area of the circuit board of the new product. In addition, the material of the USB cable for the new product should be switched from the PVC material to the PE material.

关键词： Back-propagation neural network TOPSIS design for environment ecodesign product development

Distinguish models mimicking the SM Higgs

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2013年第3期8卷 285-293页

作者： Jung Chang Kingman Cheung Po-Yan Tseng tzu-chiang Yuan Department of Physics Tsing Hua University Hsinchu 300 Taiwan China Division of Quantum Phases and Devices School of Physics Konkuk University Seoul 143-701 Republic of Korea Institute of Physics Academia Sinica Nangang Taipei 11529 Taiwan China

The new particle around 125 GeV observed at the LHC is almost consistent with the standard model Higgs boson, except that the diphoton decay mode may be excessive. We summarize a number of possibilities. We propose to use the vector-boson fusion to test the underlying model for electroweak symmetry breaking. Using the well known dijet-tagging technique to single out the vector-boson fusion mechanism, we investigate potential of vector-boson fusion to discriminate a number of models suggested to give an enhanced inclusive diphoton production rate.

关键词： Higgs boson vector-boson fusion diphoton electroweak svmmetrv breaking

Disentangling the spin-parity of a resonance via the gold-plated decay mode

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2016年第3期40卷 12-28页

作者： Tanmoy Modak Dibyakrupa Sahoo Rahul Sinha Hai-Yang Cheng tzu-chiang Yuan The Institute of Mathematical Sciences Taramani Chennai 600113 Institute of Physics Academia Sinica Taipei 11529

Searching for new resonances and finding out their properties is an essential part of any existing or future particle physics experiment. The nature of a new resonance is characterized by its spin, charge conjugation,parity, and its couplings with the existing particles of the Standard Model. If a new resonance is found in the four lepton final state produced via two intermediate Z bosons, the resonance could be a new heavy scalar or a Z boson or even a higher spin particle. In such cases a step by step methodology as enunciated in this paper can be followed to determine the spin, parity and the coupling to two Z bosons of the parent particles, in a fully model-independent way. In our approach we show how three uni-angular distributions and a few experimentally measurable observables can conclusively tell us about the spin, parity as well as the couplings of the new resonance to two Z bosons. We have performed a numerical analysis to validate our approach and showed how the uni-angular observables can be used to disentangle the spin parity as well as the coupling of the resonance.

关键词： general spin-parity analysis angular distributions angular asymmetries

Performance Investigation of Capillary Tubes for Machine Tool Coolers Retrofitted with HFC-407C Refrigerant

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2012年第5期25卷 933-939页

作者： wang Fujen CHANG Tongbou chiang Weiming LEE Haochung Department of Refrigeration and Air Conditioning Engineering Chin-Yi University of Technology Department of Mechanical Engineering Southern Taiwan University Energy & Environment Research Laboratories Industrial Technology Research Institute

The machine tool coolers are the best managers of coolant temperature in avoiding the deviation of spindle centerline for machine tools. However, the machine coolers are facing the compressed schedule to phase out the HCFC （hydro-chloro-floro-carbon） refrigerant and little attention has been paid to comparative study on sizing capillary tube for retrofitted HFC （hydro-floro-carbon） refrigerant. In this paper, the adiabatic flow in capillary tube is analyzed and modeled for retrofitting of HFC-407C refrigerant in a machine tool cooler system. A computer code including determining the length of sub-cooled flow region and the two phase region of capillary tube is developed. Comparative study of HCFC-22 and HFC-407C in a capillary tube is derived and conducted to simplify the traditional trial-and-error method of predicting the length of capillary tubes. Besides, experimental investigation is carried out by field tests to verify the simulation model and cooling performance of the machine tool cooler system. The results from the experiments reveal that the numerical model provides an effective approach to determine the performance data of capillary tube specific for retrofitting a HFC-407C machine tool cooler. The developed machine tool cooler system is not only directly compatible with new HFC-407C refrigerant, but can also perform a cost-effective temperature control specific for industrial machines.

关键词： machine tool cooler capillary tube refrigerant retrofitting

Recovery of rare and precious metals from urban mines —— A review

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2017年第5期11卷 3-19页

作者： Mengmeng wang Quanyin Tan Joseph F. chiang Jinhui Li Key Laboratory for Solid Waste Management and Environment Safety (Tsinghua University) Ministry of Education of China School of Environment Tsinghua University Beijing 100084 China Department of Chemistry and Biochemistry State University of New York College at Oneonta Oneonta NY 13820 USA

Urban mining is essential for continued natural resource extraction. The recovery of rare and precious metals （RPMs） from urban mines has attracted increasing attention from both academic and industrial sectors, because of the broad application and high price of RPMs, and their low content in natural ores. This study summarizes the distribution characteristics of various RPMs in urban mines, and the advantages and shortcomings of various technologies for RPM recovery from urban mines, including both conventional （pyrometallurgical, hydrometallurgical, and biometallurgical processing）, and emerging （electrochemical, supereritieal fluid, mechanochemical, and ionic liquids processing） technologies. Mechanical/physical technologies are commonly employed to separate RPMs from nonmetallic components in a pre-treatment process. A pyrometallurgical process is often used tbr RPM recovery, although the expensive equipment required has limited its use in small and medium-sized enterprises. Hydrometallurgical processing is effective and easy to operate, with high selectivity of target metals and high recovery efficiency of RPMs, compared to pyrometallurgy. Biometallurgy, though, has shown the most promise for leaching RPMs from urban mines, because of its low cost and environmental friendliness. Newly developed technologies electrochemical, supercritical fluid, ionic liquid, and mechanochemical have offered new choices and achieved some success in laboratory experiments, especially as efficient and environmentally friendly methods of recycling RPMs. With continuing advances in science and technology, more technologies will no doubt be developed in this field, and be able to contribute to the sustainability of RPM mining.

关键词： Rare and precious metals (RPMs) Distribution characteristics Recycling technology Emerging technology Supercritical fluid

Sustainability Evaluation of Modern Photovoltaic Agriculture Based on Interval Type-2 Fuzzy AHP-TOPSIS and Least Squares Support Vector Machine Optimized by Fireworks Algorithm

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 Engineering 2022年第1期119卷 163-188页

作者： Yi Liang Haichao wang Wei-chiang Hong School of Management Hebei GEO UniversityShijiazhuang050031China Strategy and Management Base of Mineral Resources in Hebei Province Hebei GEO UniversityShijiazhuang050031China Long Yuan(Beijing)Wind Power Engineering&Consulting Co. Ltd.Beijing100034China Department of Information Management Oriental Institute of TechnologyNew TaipeiTaiwanChina

Photovoltaics(PV)has been combined with many other industries,such as *** there are many problems for the sustainability of PV *** and accurate sustainability evaluation of modern photovoltaic agriculture is of great significance for accelerating the sustainable development of modern photovoltaic *** order to improve the timeliness and accuracy of evaluation,this paper proposes an evaluation model based on interval type-2 Fuzzy AHP-TOPSIS and least squares support vector machine optimized by fireworks ***,the criteria system of modern photovoltaic agriculture sustainability is constructed from three dimensions including technology sustainability,economic sustainability and social ***,analytic hierarchy process(AHP)and technique for order preference by similarity to an ideal solution(TOPSIS)methods are improved by using interval type-2 fuzzy theory,and the traditional evaluation model based on interval type-2 Fuzzy AHP-TOPSIS is obtained,and the improved model is used for comprehensive *** that,the optimal parameters of least squares support vector machine(LSSVM)model are obtained by Fireworks algorithm(FWA)training,and the intelligent evaluationmodel for the sustainability of modern photovoltaic agriculture is constructed to realize fast and intelligent ***,an empirical analysis is conducted to demonstrate the scientificity and accuracy of the proposed *** study is conducive to the comprehensive evaluation of the sustainability of modern photovoltaic agriculture,and can provide decision-making support for more reasonable development model in the future of modern photovoltaic agriculture.

关键词： Modern photovoltaic agriculture sustainability evaluation interval type-2 fuzzy numbers AHP TOPSIS FWA LSSVM

TiO_(2)photocatalytic ceramic membranes for water and wastewater treatment:Technical readiness and pathway ahead

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 Materials Science & Technology 2024年第16期183卷 152-164页

作者： Chin Ho Kirk Peikui wang chiang Yon Douglas Chong Qi Zhao Jianguo Sun John wang Department of Material Science and Engineering Faculty of EngineeringNational University of Singapore117574Singapore Department of Chemistry University of SherbrookeCanada ST Engineering Advanced Material Engineering Pte.Ltd. 619523Singapore National University of Singapore(NUS)Research Institute(Chongqing) Chongqing Liang Jiang New AreaChongqing401120China

TiO_(2)is one of the best-known environmentally friendly photocatalysts that has demonstrated the great potential to degrade a wide variety of organic foulants in water and wastewater treatment when placed under UV ***,TiO_(2)-based photocatalytic membranes are at the forefront of photodegra-dation research and technical *** membrane setup provides a high contact surface area for ef-fective filtration and degradation,without the necessary hassle of photocatalyst recovery after water and wastewater ***,TiO_(2)photocatalytic ceramic membranes have become an emerging re-search area due to the inherent chemical and mechanical stability of ceramic membranes,which enables them to outperform polymeric *** the recent shift from polymeric to ceramic membranes in industrial applications,TiO_(2)photocatalytic ceramic membranes will become a key player among the next-generation ceramic membranes,as they are capable of multiple *** review provides a timely and focused investigation into the fabrication and application of such TiO_(2)photocatalytic ceramic membranes for water and wastewater *** benefits of using photocatalytic ceramic membranes in filtration,such as a higher foulant removal efficiency,higher water permeability,and much improved antifouling capabilities,are highlighted and ***,the current research,technical readiness,and remaining gaps are identified,and a set of critical insights are provided using the available data to guide the developmental pathway of practical TiO_(2)photocatalytic ceramic membranes for water and wastewater treatment.

关键词： Water treatment Photocatalytic ceramic membranes Antifouling Titanium dioxide(TiO_(2))