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Superconducting gap opens fully in the newly found topological kagome metal CsV_(3)Sb_(5)

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Science China(Physics,Mechanics & Astronomy) 2021年第10期64卷 21-22页

作者： Hai-Hu wen National Laboratory of Solid State Microstructures and Department of Physics Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

Compounds with kagome lattices can accommodate several kinds of novel quantum states, such as the quantum spin liquid, non-trivial topological Dirac bands, and strongly renormalized flat bands, which may lead to vario... 详细信息

关键词： properties. topological bands

Nanoscale precipitates and comprehensive strengthening mechanism in AISI H13 steel

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International Journal of Minerals,Metallurgy and Materials 2016年第9期23卷 1056-1064页

作者： wen-wen Mao An-gang Ning Han-jie Guo School of Metallurgical and Ecological Engineering University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Special Melting and Reparation of High-end Metal Materials Beijing 100083China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuanShanxi 030024China

The effects of heat treatment on the precipitates and strengthening mechanism in AISI H13 steel were investigated. The results showed that the presence of nanoscale precipitates favorably affected grain refinement and improved the yield strength. The volume fraction of precipitates increased from 1.05% to 2.85% during tempering, whereas the average precipitate size first decreased then increased during tempering. Contributions to the yield strength arising from the various mechanisms were calculated quantificationally, and the results demonstrated that grain refinement and dislocation density most strongly influenced the yield strength. In addition, under the interaction of average size and volume fraction, precipitates＇ contribution to the yield strength ranged from 247.9 to 378.5 MPa. Finally, a root-mean-square summation law of σ = σg ＋ σs ＋（σd^2 ＋ σp^2）^1/2, where σg, σs, σd, and σp represent the contributions of fine-grain strengthening, solid-solution strengthening, dislocation strengthening, and precipitation strengthening, respectively, was confirmed as the most applicable for AISI H13 steel, which indicates a strong link between precipitates and dislocations in AISI H13 steel.

关键词： die steel precipitates strengthening dislocation

Goal-Oriented Control Systems(GOCS):From HOW to WHAT

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IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 816-819页

作者： wen-Hua Chen the Department of Aeronautical and Automotive Engineering Loughborough UniversityLeicestershireLE113TUU.K.

Brief:New control theory is required to underpin safe design and deployment of future highly automated systems to deal with uncertain environments and complicated tasks,enabled by AI and other advanced ***-Oriented Control Systems offer potential to transform the control system design from currently instructing a control system how to perform a task to specifying what is to be achieved.

关键词： automated instru system

Measuring the value of water quality improvements in Lake Tai, China

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第9期12卷 710-719页

作者： Wei-wen ZHANG Department of Land Management Zhejiang University Hangzhou 310029 China

Despite widespread concerns and elevated policy debates, little is known about the Chinese public＇s perceptions of water pollution and willingness to cooperate with government policies. Based on survey data, this study examined Lake Tai resident perception of water pollution, willingness to pay （WTP） for water quality improvements, and its influencing factors. Contingent valuation （CV） results showed that respondents would prefer to pay 141 CNY per household a year, approximately 0.70% of their annual per capita disposable income, as an environmental fee to improve water quality in Lake Yai. Aggregate WTP for all five lakeside cities of Lake Tai was estimated at about 3.8 billion CNY, without discounts, in the next ten years. WTP was found to increase with income and female respondents were willing to pay more than males. Those respondents who were dissatisfied with water quality were more likely to pay more. The usage of Lake Tai did not strongly affect WTE

关键词： Water quality Willingness to pay (WTP) Contingent valuation (CV) Lake Tai

Dynamic responses of a sediment-filled valley with a fluid layer subject to incident waves

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Earthquake Engineering and Engineering Vibration 2011年第2期10卷 175-185页

作者： wen-I Liao Taipei University of Technology (NTUT)

The diffraction of elastic waves by a sedimentary valley in a homogeneous elastic half-space is studied in this paper. The sediment-filled valley is composed of a fluid layer over a soft soil deposit whose characteristics may be significant and should be carefully considered when designing long span bridges with high piers. The method of analysis adopted in the paper is to decompose the problem into an interior region and an exterior region. In the exterior region, the scattered wave fields are constructed with the linear combinations of two independent sets of Lamb＇s singular solutions, i.e., the integral solutions for two concentrated surface loads in two directions; and their derivatives are used to represent the scattered wave fields. A technique is proposed to calculate the integrals in the wave-number domain based on the method of steepest descent. For the interior region, the wave fields for the fluid layer and soft soil deposit are expressed in terms of wave functions which satisfy the equation of motion. The continuity condition at the interface of the media is satisfied in the least square sense. The effects of geometric topography, soil amplification and fluid layer subject to different types of incident harmonic plane waves are analyzed and discussed..

关键词： sedimentary valley scattered wave least square

Quantum model for understanding protein misfolding behavior——phase diagram and manual intervention

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Science China(Physics,Mechanics & Astronomy) 2021年第6期64卷 10-16页

作者： wen-wen Mao Li-Hua Lu You-Quan Li Zhejiang Province Key Laboratory of Quantum Technology&Device and Department of Physics Zhejiang UniversityHangzhou 310027China Collaberative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210008China

The study of protein folding is fundamental and important in the multidisciplinary field because a diversity of diseases,like Alzheimer’s and Parkinson’s are relevant to protein *** current thermodynamic and geometric approaches only phenomenologically describe but do not provide a mechanistic understanding of the competition between correct folding and *** we present a model to understand the misfolding *** the influence of dissipative strength for all possible sequences and comparing the folding time toward different compact structures,we obtain a phase diagram of the dissipative quantum phase transition that enables us to model the *** also investigate how a perturbation in the Hamiltonian affects the transition point,which motivates us to explore possible manual *** results indicate that the manual intervention may be effective for some specific sequence but not for *** approach is expected to lay a foundation for further studies on manual intervention in protein misfolding.

关键词： quantum phase diagram quantum walk mean first-passage time protein folding

Two new eudesmane derivatives from Verbesina virginica

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Chinese Chemical Letters 2010年第6期21卷 693-695页

作者： wen College of Life Sciences Northwest A & F UniversityYanglingShaanxi 712100China National Center for Natural Products Research Research Institute of Pharmaceutical SciencesSchool of PharmacyThe University of MississippiMS 38677USA

Two new eudesmane derivatives were isolated from the leaves and flowers of Verbesina virginica,along with the known 6-O-β-E -p-coumaroyl-4α-hydroxyeudesmane(1).Their structures were determined as 6-O-β-Z-p-coumaroy... 详细信息

关键词： Verbesina virginica Eudesmane Sesquiterpene

STABILITY ANALYSIS AND APPLICATION OF THE EXPONENTIAL TIME DIFFERENCING SCHEMES

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Journal of Computational Mathematics 2004年第2期22卷 200-209页

作者： QiangDu wen-xiangZhu DepartmentofMathematics PennsylvaniaStateUniversityUniversityParkPA16802USA

Exponential time differencing schemes are time integration methods that can be efficiently combined with spatial spectral approximations to provide very high resolution to the smooth solutions of some linear and nonlinear partial differential equations. We study in this paper the stability properties of some exponential time differencing schemes. We also present their application to the numerical solution of the scalar Allen-Cahn equation in two and three dimensional spaces.

关键词： Allen-Cahn equations Energy estimates Exponential time differencing Fourier analysis Fourier spectral methods Maximum principle Phase transitions Stability Time integration schemes

Particuology and climate change

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Particuology 2010年第6期8卷 507-513页

作者： wen-Ching Yang Department of Chemical and Petroleum Engineering University of PittsburghPittsburghPA 15261USA Booz Allen Hamilaton P.O.Box 10940626 Cochrans Mill RoadPittsburghPA 15236USA

The global concern over the greenhouse gas emissions and its effect on global warming and climate change has focused attention on the necessity of carbon dioxide capture and sequestration. There are many processes proposed to capture carbon either before or after combustion and these processes invariably involve investigation and application of traditional particuology. The solids employed are of different sizes, densities, morphologies, and strengths. Their handling, transportation, recirculation, and reactor applications are the essence of ＇particuology＇. Particuology can play an important and vital role in achieving cost-effective removal of carbon and minimize emissions of greenhouse gases. In this paper, the existing and developing carbon capture processes are briefly reviewed and the opportunities for application of particuology are identified. The review was not intended to be exhaustive. It is only in sufficient detail to make connection between particuology and climate change. For immediate and future challenges of reducing global warming and carbon capture and sequestration, innovative reactor design and application of parricuology is imperative. Expertise and innovation in particuology can greatly enhance the speed of development of those technologies and help to achieve cost-effective implementation. Particuology is indeed intimately related to the climate change and global warming.

关键词： Particuology Fluidized beds Circulating fluidized beds Pre-combustion Post-combustion Oxycombustion Chemical looping Carbon dioxide capture Carbon dioxide sequestration Climate changes Global warming