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Effects of incident wind/wave directions on dynamic response of a SPAR-type floating offshore wind turbine system

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Acta Mechanica Sinica 2019年第5期35卷 954-963页

作者： Guoqin Lyu Huiqin Zhang Jiachun Li Key Laboratory for Mechanics in Fluid Solid Coupling System Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China

As a promising renewable energy,offshore wind energy currently is gaining more attention,by which the economic and efficient operation of floating wind turbine systems is a potential research direction.This study is primarily devoted to the analysis of dynamic response of the NREL-5 MW reference wind turbine supported by an OC3-Hywind SPAR-type platform using a recompiled code which combines FAST with WAMIT.To verify the reliability of the recompiled code,the free decay motions of a floating wind turbine system in still water are examined with satisfactory results.After that,thirteen scenarios with different angles between wind and wave from 0°to 90°are investigated.The dynamic responses of the turbine system in various degrees of freedom(DOFs)for different incident wind/wave directions are presented in both time and frequency domains via the fast Fourier transform.

关键词： Offshore floating wind turbine Dynamic responses SPAR-type wind turbine Distributions of wind and wave directions

A flutter-effect-based triboelectric nanogenerator for breeze energy collection from arbitrary directions and self-powered wind speed sensor

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Nano Research 2019年第12期12卷 3018-3023页

作者： Jie Hu Xianjie Pu Hongmei Yang Qixuan Zeng Qian Tang Dazhi Zhang Chenguo Hu Yi Xi Department of Applied Physics State Key Laboratory of Power Transmission Equipment&System Security and New TechnologyChongqing UniversityChongqing 400044China

Triboelectric nanogenerators(TENGs)have been developed rapidly into an efficient wind energy collection equipment.Reducing the frictionwear and energy loss in breeze energy collection is a research direction worthy of attention.Herein,a flutter-effect-based triboelectricnanogen erator(FE-TENG)is designed to collect the breeze energy at low wind speed from arbitrary directions.Distinguishing from previouswind-driven TENGs,the wind-driven part of this device is separated from the TENG units,which not only avoids the wear of friction layerscaused by direct wind contact but also reduces the energy loss,therefore,relatively stable electric outputs are obtained with Voc-281 V,Isc-13.4μA,Qsc-143 nC,and output power-4 mW at the wind speed of 4.5 m/s,respectively.In addition,a real-time wind speed monitoringsystem based on LabVIEW software with high sen sitivity and fast response to wind is achieved relying on the excellent linear relation shipbetween wind speed and electrical output signal.Furthermore,it has been successfully applied as power sources for portable electronics,about 170 commercial light-emitting devices(LEDs)are lighted and a digital watch is successfully driven at the wind speed of 2.9 m/s.This worknot only provides a new structure and idea for the future collection of clean and sustainable breeze energy from arbitrary directions but also hasgreat potential in the field of self-powered systems.

关键词： flutter effect triboelectric nanogenerator arbitrary directions wind speed sensor

New directions in quantum neural networks research

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Control Theory and Technology 2019年第4期17卷 393-395页

作者： Wei CUI Shilu YAN School of Automation Science and Engineering South China University of TechnologyGuangzhou Guangdong 510640China

With the development of quantum information technology,the performance highlighted by quantum computing represents the unparalleled superiority over the classical computing.As a new computing paradigm,it has attracted more and more attentions.Quantum theory and artificial neural networks have many essential intercommunication in solving problems.The fusion of these two fields forms the discipline of quantum neural networks[1,2],meanwhile,provides many research opportunities.Firstly,a number of recent works have used neural networks to study properties of quantum systems.Secondly,redefining and reconstructing more efficient neural networks based on quantum information theory have gradually aroused people's interest.

关键词： problems. quantum directions

Complex system management in the post-COVID world:Five research directions

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Fundamental Research 2022年第5期2卷 659-660页

作者： Shouyang Wang Yuze Li Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190China Questrom School of Business Boston UniversityBoston 02215United States

A complex system is composed of many interrelated elements,and the interaction between these elements makes the overall performance of the system greater than the sum of member performance[1-5].In the context of management,various forms of organizations,from micro enterprises to macroeconomic systems,can be seen as systems formed by a large number of interactive individuals acting on their own limited information.

关键词： system directions elements

A Primal-dual Interior-point Algorithm for Symmetric Cone Convex Quadratic Programming Based on the Commutative Class directions

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Acta Mathematicae Applicatae Sinica 2019年第2期35卷 359-373页

作者： S.ASADI H.MANSOURI M.ZANGIABADI Department of Applied Mathematics Faculty of Mathematical SciencesShahrekord University

In this paper, we present a neighborhood following primal-dual interior-point algorithm for solving symmetric cone convex quadratic programming problems, where the objective function is a convex quadratic function and the feasible set is the intersection of an affine subspace and a symmetric cone attached to a Euclidean Jordan algebra. The algorithm is based on the [13] broad class of commutative search directions for cone of semidefinite matrices, extended by [18] to arbitrary symmetric cones. Despite the fact that the neighborhood is wider, which allows the iterates move towards optimality with longer steps, the complexity iteration bound remains as the same result of Schmieta and Alizadeh for symmetric cone optimization problems.

关键词： interior-point method symmetric cone convex quadratic programming wide neighborhood commutative class directions complexity bound

The ReaxFF reactive force-field: development, applications and future directions

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npj Computational Materials 2016年第1期2卷 202-215页

作者： Thomas P Senftle Sungwook Hong Md Mahbubul Islam Sudhir B Kylasa Yuanxia Zheng Yun Kyung Shin Chad Junkermeier Roman Engel-Herbert Michael J Janik Hasan Metin Aktulga Toon Verstraelen Ananth Grama Adri CT van Duin Department of Chemical Engineering Pennsylvania State UniversityUniversity ParkPAUSA Department of Mechanical and Nuclear Engineering Pennsylvania State UniversityUniversity ParkPAUSA Department of Computer Science and Engineering PurdueWest LafayetteINUSA Department of Materials Science and Engineering Pennsylvania State UniversityUniversity ParkPAUSA Department of Computer Science and Engineering Michigan State UniversityEast LansingMIUSA Center for Molecular Modeling(CMM) Ghent UniversityZwijnaardeBelgium

The reactive force-field(ReaxFF)interatomic potential is a powerful computational tool for exploring,developing and optimizing material properties.Methods based on the principles of quantum mechanics(QM),while offering valuable theoretical guidance at the electronic level,are often too computationally intense for simulations that consider the full dynamic evolution of a system.Alternatively,empirical interatomic potentials that are based on classical principles require significantly fewer computational resources,which enables simulations to better describe dynamic processes over longer timeframes and on larger scales.Such methods,however,typically require a predefined connectivity between atoms,precluding simulations that involve reactive events.The ReaxFF method was developed to help bridge this gap.Approaching the gap from the classical side,ReaxFF casts the empirical interatomic potential within a bond-order formalism,thus implicitly describing chemical bonding without expensive QM calculations.This article provides an overview of the development,application,and future directions of the ReaxFF method.

关键词： properties directions bonding

The value of health communication scholarship: New directions for health communication inquiry

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International Journal of Nursing Sciences 2020年第S1期7卷 4-7页

作者： Gary L.Kreps George Mason University United States

1.Health communication as an important field of study The field of health communication research,education,and application has grown rapidly over the past four decades as a major transdisciplinary area of research,education,and outreach.Health communication scholarship combines expertise from the communication sciences(including the sub-fields of interpersonal,group,organizational,intercultural,family,political,strategic,and environmental communication,rhetorical studies,journalism,mass media,and computer-mediated communication inquiry),the social sciences(with disciplines such as psychology,sociology,anthropology,economics,and political science),the physical sciences(with disciplines such as biology,pharmacology,and chemistry),and with professional fields of study(including Medicine,Nursing,Pharmacy,Dentistry,Health Administration,Public Health,Public Policy,Epidemiology,and Health Informatics)to examine the powerful influences of communication on health and illness[1-5].

关键词： Pharmacy education directions

Special Issue on future directions in plasma nanoscience

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Frontiers of Chemical Science and Engineering 2019年第2期13卷 199-200页

作者： Erik C.Neyts Department of Chemistry University of Antwerp2610 AntwerpBelgium

Over the past 20 years,plasma nanoscience has become a mature and vibrant field.It deals with both the fundamental science and applications of low-temperature plasmas,ion beams,lasers,and related approaches and how this relates to the fabrication,synthesis,modification,and integration in and of nanoscale materials,structures and functional devices.The complexity often encountered in research in this field intrinsically calls for both fundamental and applied research,both experimental and theoretical.Plasma nanoscience,therefore,is a highly multidisciplinary field,bringing together researchers from physics,chemistry,medicine,engineering,biochemistry,informatics and more.

关键词： Special Issue future directions plasma nanoscience

BUILDING A SECURE AND PROSPEROUS LMC COMMUNITY WITH A SHARED FUTURE The Global Security Initiative will expand cooperation among Lancang- Mekong countries in new directions and with new momentum

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China Report ASEAN 2023年第4期8卷 57-59页

作者： Bao Zhipeng Department for Asia-Pacific Security and Cooperation of China Institute of International Studies

This year marks the seventh anniversary of the launch of the Lancang-Mekong Cooperation(LMC)mechanism and the first year of the Five-Year Plan of Action on the Lancang-Mekong Cooperation(2023-2027).Theseventh LMC Foreign Ministers’Meeting in July 2022 formally proposed jointly building the region into a pilot zone for the Global Security Initiative(GSI).Recently,China officially released the“The Global Security Initiative Concept Paper,”which again clearly stated that it supports“efforts to promote cooperation in non-traditional security areas under the framework of the LMC,striving to foster a pilot zone for the GSI.”In the future,the GSI will expand cooperation among Lancang-Mekong countries in new directions and with new momentum,at both conceptual and practical levels.

关键词： directions stated formally