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Transmission Index Research of Parallel Manipulators Based on Matrix Orthogonal Degree

Chinese Journal of Mechanical engineering 2017年第6期30卷 1396-1405页

作者： Zhu-Feng Shao Jiao Mo Xiao-Qiang Tang Li-Ping Wang State Key Laboratory of Tribology and Institute of Manufacturing Engineering Tsinghua UniversityBeijing 100084 China Beijing Key Lab of Precision/Ultra-precision Manufacturing Equipments and Control Tsinghua UniversityBeijing 100084 China

Performance index mance evaluation, and is the is the standard of perfor- foundation of both perfor- mance analysis and optimal design for the parallel manipulator. Seeking the suitable kinematic indices is always an important and challenging issue for the parallel manipulator. So far, there are extensive studies in this field, but few existing indices can meet all the requirements, such as simple, intuitive, and universal. To solve this problem, the matrix orthogonal degree is adopted, and generalized transmission indices that can evaluate motion/force trans- missibility of fully parallel manipulators are proposed. Transmission performance analysis of typical branches, end effectors, and parallel manipulators is given to illus- trate proposed indices and analysis methodology. Simula- tion and analysis results reveal that proposed transmission indices possess significant advantages, such as normalized finite （ranging from 0 to l）, dimensionally homogeneous, frame-free, intuitive and easy to calculate. Besides, pro- posed indices well indicate the good transmission region and relativity to the singularity with better resolution than the traditional local conditioning index, and provide a novel tool for kinematic analysis and optimal design of fully parallel manipulators.

关键词： Transmission index Parallel mechanism Kinematic performance Matrix orthogonal degree

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Recursive network estimation from binary-valued observation data

arXiv

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arXiv 2019年

作者： Xing, Yu He, Xingkang Fang, Haitao Johansson, Karl Henrik Key Laboratory of Systems and Control Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing100190 China School of Mathematical Sciences University of Chinese Academy of Sciences Beijing100049 China Division of Decision and Control Systems School of Electrical Engineering and Computer Science KTH Royal Institute of Technology StockholmSE-10044 Sweden

This paper studies the problem of recursively estimating the weighted adjacency matrix of a network out of a temporal sequence of binary-valued observations. The observation sequence is generated from nonlinear networked dynamics in which agents exchange and display binary outputs. Sufficient conditions are given to ensure stability of the observation sequence and identifiability of the system parameters. It is shown that stability and identifiability can be guaranteed under the assumption of independent standard Gaussian disturbances. Via a maximum likelihood approach, the estimation problem is transformed into an optimization problem, and it is verified that its solution is the true parameter vector under the independent standard Gaussian assumption. A recursive algorithm for the estimation problem is then proposed based on stochastic approximation techniques. Its strong consistency is established and convergence rate analyzed. Finally, numerical simulations are conducted to illustrate the results and to show that the proposed algorithm is insensitive to small unmodeled factors. Copyright © 2019, The Authors. All rights reserved.

关键词： Approximation theory

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The influence of nonlinear shear stress on partially averaged Navier-Stokes(PANS)method

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Journal of Hydrodynamics 2017年第3期29卷 479-484页

作者：刘锦涛郭鹏程陈铁军吴玉林 Beijing Institute of Control Engineering Beijing 100190China State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area Xi'an University of TechnologyXi'an710048China Department of Thermal Engineeering Tsinghua UniversityBeijing 100084China

In most of partially averaged Navier-Stokes（PANS）methods,the Reynolds stress is solved by a linear hypothesis isotropic *** could not capture all kinds of vortexes in *** this paper,a PANS model is modified from the RNG k-？turbulence model and is used to investigate the influence of the nonlinear shear stress on the simulation of the high pressure gradient flows and the large curvature *** are made between the result obtained by using the PANS model modified from the RNG k-？model and that obtained by using the nonlinear PANS *** flow past a curved rectangular duct is calculated by using the PANS *** obtained nonlinear shear stress agrees well with the experimental results,especially in the high pressure gradient *** calculation results show that the nonlinear PANS methods are more reliable than the linear PANS methods for the high pressure gradient flows,the large curvature flows,and they can be used to capture complex vortexes in a turbomachinary.

关键词： Nonlinear PANS method circular cylinder velocity distribution unsolved eddy viscosity

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Photo-Based Monitoring of Particulate Matter in the Campus: A New Strategy for Student Health

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IOP Conference Series: Earth and Environmental Science 2020年第1期555卷

作者： Yonghui Zhang Ke Gu Zhifang Xia Junfei Qiao Faculty of Information Technology Beijing University of Technology 100124 Beijing China Engineering Research Center of Intelligent Perception and Autonomous Control Ministry of Education 100124 Beijing China Beijing Key Laboratory of Computational Intelligence and Intelligent System 100124 Beijing China Beijing Artificial Intelligence Institute 100124 Beijing China State Information Center 100045 Beijing China

It is imperative for the students' future health to ensure the students in good physical levels. Recent years have witnessed the increasingly serious harm to student health caused by the continually growing concentration of Particulate Matters (PMs). Consequently, the task of preventing and controlling PM concentrations in the campus is eagerly required. A well-designed model for the monitoring of PM (as the basis for PM prevention and control) has posed a big challenge. Prior works have revealed that photo-based methods are available for the monitoring of PM. Towards validating the effectiveness of existing methods for PM monitoring in the campus, we construct a novel dataset that involves 1,500 photos collected in the beijing University of technology. Results confirm that stated-of-the-art methods are far from ideal for the monitoring of PM in the campus. To solve the aforesaid issue, this paper further proposes a novel photo-based PM monitoring model by using the weighted average method solved by LASSO regression to fuse the above methods' outputs tested to infer the PM values. Results demonstrate the superiority of our proposed model as compared to state-of-the-art methods on the large-scale AQPDBJUT dataset.

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Gain-scheduling autopilot design based on fixed-structure synthesis

Gain-scheduling autopilot design based on fixed-structure sy...

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IEEE Chinese Guidance, Navigation and control Conference (CGNCC)

作者： Bin Li Defu Lin Hui Wang Jiang Wang School of Aerospace and Engineering and Beijing key laboratory of UAV Autonomous Control Beijing Institute of Technology Beijing China

ISBN: (数字)9781538611715

ISBN: (纸本)9781538611722

A novel global gain-scheduling controller based on fixed-structure synthesis for missile autopilot has been presented in this paper. The original nonlinear control problem is going to be converted into a multi-model linear time invariant (LTI) structured-controller synthesis by fixed-structure synthesis. Missile three-loop autopilot structure and suitable performance constraints, including acceleration tracking, disturbances rejection, stability margin and pole constraints are considered. Nonsmooth optimization technique is utilized to overcome this multi-model synthesis problem. Gain surface tuning (GST) technique based on quadratic polynomial function of gain-scheduled parameters is applied to smooth the controller gains in order to avoid posteriori interpolation. Simulation results validate the effectiveness and robustness of the proposed method.

关键词： Missiles Acceleration Stability analysis Aerodynamics Linear systems Interpolation Q measurement

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Observation of Fano resonance in photoluminescence of a two-dimensional magnetic semiconductor

arXiv

引用

arXiv 2019年

作者： Gu, Pingfan Tan, Qinghai Wan, Yi Li, Ziling Peng, Yuxuan Lai, Jiawei Ma, Junchao Yao, Xiaohan Yuan, Kai Sun, Dong Peng, Bo Zhang, Jun Ye, Yu State Key Laboratory for Artificial Microstructure & Mesoscopic Physics Nanooptoelectronics Frontier Center of the Ministry of Education School of Physics Peking University Beijing100871 China State Key Laboratory of Superlattices and Microstructures Institute of Semiconductors & Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing100049 China International Center of Quantum Matter Beijing100871 China Collaborative Innovation Center of Quantum Matter Beijing100871 China National Engineering Research Center of Electromagnetic Radiation Control Materials State Key Laboratory of Electronic Thin Films and Integrated Devices School of Microelectronics and Solid State Electronics University of Electronic Science and Technology of China Chengdu610054 China Beiing Academy of Quantum Information Science Beijing100193 China

Quantum interference gives rise to the asymmetric Fano resonance line shape when the final states of an electronic transition follows within a continuum of states and a discrete state, which has significant applications in optical switching and sensing. The resonant optical phenomena associated with Fano resonance have been observed by absorption spectra, Raman spectra, transmission spectra, etc., but have rarely been reported in photoluminescence (PL) spectroscopy. In this work, we performed spectroscopic studies on layered chromium thiophosphate (CrPS4), a promising ternary antiferromagnetic semiconductor with PL in near-infrared wavelength region and observed Fano resonance when CrPS4 experiences phase transition into the antiferromagnetic state below Néel temperature (38 K). The photoluminescence of the continuum states results from the d band transitions localized at Cr3+ ions, while the discrete state reaches saturation at high excitation power and can be enhanced by the external magnetic field, suggesting it is formed by an impurity level from extra atomic phosphorus. Our findings provide insights into the electronic transitions of CrPS4 and their connection to its intrinsic magnetic properties. Copyright © 2019, The Authors. All rights reserved.

关键词： Chromium compounds

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Product Service System-based Municipal Solid Waste circular management platform in Campania Region (Italy): a preliminary analysis

引用

Procedia CIRP 2019年 83卷 224-229页

作者： Marco Casazza Donald Huisingh Sergio Ulgiati Vincenzo Severino Gengyuan Liu Massimiliano Lega Parthenope University of Napoli Department of Engineering Centro Direzionale Isola C4 80143 Naples Italy Parthenope University of Napoli Department of Science and Technology Centro Direzionale Isola C4 80143 Naples Italy University of Tennessee The Institute for a Secure and Sustainable Environment Knoxville TN USA State Key Joint Laboratory of Environment Simulation and Pollution Control School of Environment Beijing Normal University Beijing 100875 China Beijing Engineering Research Center for Watershed Environmental Restoration & Integrated Ecological Regulation Beijing 100875 China

The huge amount of Municipal Solid Waste (MSW) generated in the world, as well as the adverse impacts on resources depletion, environmental contamination and human health are problems that need to be promptly, effectively and equitably addressed. Among the areas affected by management misconduct and illicit interests, the Campania region represents a paradigmatic case. A lack of detailed information about MSW flows, from collection and through treatment phases, prevents policy-makers and planners from finding appropriate and environmentally and economically sound solutions. As a partial approach to the solution, the authors of this paper outline the structure and functions of a Product Services System (PSS) based MSW management platform. In particular, data collection and elaboration, documentation of MSW flows and detection of environmental and human health impacts and waste prevention/reduction are essential elements of MSW of the system, within which the PSSs can be applied. Real-time sensors, big data analysis tools and online platforms are integrated, as basic tools, to implement the transition to equitable, sustainable circular economies. The solutions will be based upon multi-stakeholder inputs in decision-making to effectively address local needs to implement a re-designed, adaptive, dynamic, MSW management system. The new system must ensure safe and ecologically sound management of the resources in MSWs. As the new management system provides improvements in the environmental and human health and results in an expansion of jobs, it is anticipated that the system could also be useful in other parts of the world.

关键词： waste management circular economy product-service system

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Design and Experimental Research of the Inbuilt Oil Collection System for the Oil Spill Recovery Ship

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IOP Conference Series: Earth and Environmental Science 2020年第2期558卷

作者： Yunfei Zou Panpan Zhang Dewen Zhang Rui He China Waterborne Transport Research Institute Beijing China China Key Laboratory of Logistics Equipment & Control Engineering Beijing China Qingdao Guangming Environmental Protection Technology Co. Ltd Qingdao China

The inbuilt oil collection system of the oil spill recovery ship is based on the principle of downward belt skimmer. The system adopts a composite structure, which is integrated with the downward belt skimmer and the upward belt device. The skimmer is used for oil recovery and the upward conveyor belt device is used for rubbish disposal. In this paper, experiments in the test hull and test pool were carried out to investigate the performance of the inbuilt oil collection system such as the recovery rate, the recovery efficiency and the waste adaptability. The test results show that the oil spill recovery system has the advantages of compact structure, high recovery rate and efficiency, high adaptability of garbage, high safety of operation and so on.

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Fungal diversity notes 1151-1276:taxonomic and phylogenetic contributions on genera and species of fungal taxa

引用

Fungal Diversity 2020年第1期100卷 5-277页

作者： Kevin DHyde Yang Dong Rungtiwa Phookamsak Rajesh Jeewon DJayarama Bhat EBGareth Jones Ning‑Guo Liu Pranami DAbeywickrama Ausana Mapook Deping Wei Rekhani HPerera Ishara SManawasinghe Dhandevi Pem Digvijayini Bundhun Anuruddha Karunarathna Anusha HEkanayaka Dan‑Feng Bao Junfu Li Milan CSamarakoon Napalai Chaiwan Chuan‑Gen Lin Kunthida Phutthacharoen Sheng‑Nan Zhang Indunil CSenanayake Ishani DGoonasekara Kasun MThambugala Chayanard Phukhamsakda Danushka STennakoon Hong‑Bo Jiang Jing Yang Ming Zeng Naruemon Huanraluek Jian‑Kui(Jack)Liu Subodini NWijesinghe Qing Tian Saowaluck Tibpromma Rashika SBrahmanage Saranyaphat Boonmee Shi‑Ke Huang Vinodhini Thiyagaraja Yong‑Zhong Lu Ruvishika SJayawardena Wei Dong Er‑Fu Yang Sanjay KSingh Shiv Mohan Singh Shiwali Rana Sneha SLad Garima Anand Bandarupalli Devadatha MNiranjan VVenkateswara Sarma Kare Liimatainen 馻‑ Tuula Niskanen Andy Overall Renato Lúcio Mendes Alvarenga Tatiana Baptista Gibertoni Walter PPfliegler EnikőHorváth Alexandra Imre Amanda Lucia Alves Ana Carla da Silva Santos Patricia Vieira Tiago Timur SBulgakov Dhanushaka NWanasinghe Ali HBahkali Mingkwan Doilom Abdallah MElgorban Sajeewa SNMaharachchikumbura Kunhiraman CRajeshkumar Danny Haelewaters Peter EMortimer Qi Zhao Saisamorn Lumyong Jianchu Xu Jun Sheng Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunming 650201YunnanChina State Key Laboratory for Conservation and Utilization of Bio‑Resources in Yunnan Yunnan Agricultural UniversityKunming 650201China Yunnan Research Institute for Local Plateau Agriculture and Industry Kunming 650201China Key Laboratory for Agro‑biodiversity and Pest Control of Ministry of Education Yunnan Agricultural UniversityKunming 650201China Center of Excellence in Fungal Research Mae Fah Luang UniversityChiang Rai 57100Thailand East and Central Asia Regional Office World Agroforestry Centre(ICRAF)Kunming 650201YunnanChina Centre for Mountain Futures(CMF) Kunming Institute of BotanyKunming 650201YunnanChina Mushroom Research Foundation 128 M.3 Ban Pa Deng T.Pa PaeA.Mae TaengChiang Mai 50150Thailand Department of Health Sciences Faculty of ScienceUniversity of MauritiusReduitMauritius No.128/1‑J Azad Co‑Op Housing SocietyCurcaGoa Velha 403108India Department of Entomology and Plant Pathology Faculty of AgricultureChiang Mai UniversityChiang Mai 50200Thailand Department of Botany and Microbiology College of ScienceKing Saud UniversityP.O.Box 2455Riyadh 11451Kingdom of Saudi Arabia School of Science Mae Fah Luang UniversityChiang Rai 57100Thailand Faculty of Agriculture National Resources and EnvironmentNaresuan UniversityPhitsanulok 65000Thailand Beijing Key Laboratory of Environment Friendly Management on Fruit Diseases and Pests in North China Institute of Plant and Environment ProtectionBeijing Academy of Agriculture and Forestry SciencesBeijing 100097China Department of Soil Ecology UFZ-Helmholtz Centre for Environmental ResearchHalleGermany Guizhou Key Laboratory of Agricultural Biotechnology Guizhou Academy of Agricultural SciencesGuiyang 550006GuizhouChina Shenzhen Key Laboratory of Microbial Genetic Engineering College of Life Sciences and OceanographyShenzhen UniversityShenzhen 518060China Department of Plant M

Fungal diversity notes is one of the important journal series of fungal taxonomy that provide detailed descriptions and illustrations of new fungal taxa,as well as providing new information of fungal taxa *** article is the 11th contribution to the fungal diversity notes series,in which 126 taxa distributed in two phyla,six classes,24 orders and 55 families are described and *** in this study were mainly collected from Italy by Erio Camporesi and also collected from China,India and Thailand,as well as in some other European,North American and South American *** described in the present study include two new families,12 new genera,82 new species,five new combinations and 25 new records on new hosts and new geographical distributions as well as sexual-asexual *** two new families are Eriomycetaceae(Dothideomycetes,family incertae sedis)and Fasciatisporaceae(Xylariales,Sordariomycetes).The twelve new genera comprise Bhagirathimyces(Phaeosphaeriaceae),Camporesiomyces(Tubeufiaceae),Eriocamporesia(Cryphonectriaceae),Eriomyces(Eriomycetaceae),Neomonodictys(Pleurotheciaceae),Paraloratospora(Phaeosphaeriaceae),Paramonodictys(Parabambusicolaceae),Pseudoconlarium(Diaporthomycetidae,genus incertae sedis),Pseudomurilentithecium(Lentitheciaceae),Setoapiospora(Muyocopronaceae),Srinivasanomyces(Vibrisseaceae)and Xenoanthostomella(Xylariales,genera incertae sedis).The 82 new species comprise Acremonium chiangraiense,Adustochaete nivea,Angustimassarina camporesii,Bhagirathimyces himalayensis,Brunneoclavispora camporesii,Camarosporidiella camporesii,Camporesiomyces mali,Camposporium appendiculatum,Camposporium multiseptatum,Camposporium septatum,Canalisporium aquaticium,Clonostachys eriocamporesiana,Clonostachys eriocamporesii,Colletotrichum hederiicola,Coniochaeta vineae,Conioscypha verrucosa,Cortinarius ainsworthii,Cortinarius aurae,Cortinarius britannicus,Cortinarius heatherae,Cortinarius scoticus,Cortinarius subsaniosus,Cytospora fusispor

关键词： 96 new taxa Agaricomycetes Ascomycota Basidiomycota Dothideomycetes Lecanoromycetes Leotiomycetes Pezizomycetes Phylogeny Saccharomycetes Taxonomy

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Search for time-dependent CP violation in D0 → π+π−π0 decays

arXiv

引用

arXiv 2024年

作者： Aaij, R. Abdelmotteleb, A.S.W. Abellan Beteta, C. Abudinén, F. Ackernley, T. Adefisoye, A.A. Adeva, B. Adinolfi, M. Adlarson, P. Agapopoulou, C. Aidala, C.A. Ajaltouni, Z. Akar, S. Akiba, K. Albicocco, P. Albrecht, J. Alessio, F. Alexander, M. Aliouche, Z. Alvarez Cartelle, P. Amalric, R. Amato, S. Amey, J.L. Amhis, Y. An, L. Anderlini, L. Andersson, M. Andreianov, A. Andreola, P. Andreotti, M. Andreou, D. Anelli, A. Ao, D. Archilli, F. Argenton, M. Arguedas Cuendis, S. Artamonov, A. Artuso, M. Aslanides, E. Atzeni, M. Audurier, B. Bacher, D. Bachiller Perea, I. Bachmann, S. Bachmayer, M. Back, J.J. Baladron Rodriguez, P. Balagura, V. Baldini, W. Bao, H. Baptista de Souza Leite, J. Barbetti, M. Barbosa, I.R. Barlow, R.J. Barnyakov, M. Barsuk, S. Barter, W. Bartolini, M. Bartz, J. Baryshnikov, F. Basels, J.M. Bassi, G. Batsukh, B. Battig, A. Bay, A. Beck, A. Becker, M. Bedeschi, F. Bediaga, I.B. Belin, S. Bellee, V. Belous, K. Belov, I. Belyaev, I. Benane, G. Bencivenni, G. Ben-Haim, E. Berezhnoy, A. Bernet, R. Bernet Andres, S. Bertolin, A. Betancourt, C. Betti, F. Bex, J. Bezshyiko, Ia. Bhom, J. Bieker, M.S. Biesuz, N.V. Billoir, P. Biolchini, A. Birch, M. Bishop, F.C.R. Bitadze, A. Blake, T. Blanc, F. Blank, J.E. Blusk, S. Bocharnikov, V. Boelhauve, J.A. Boente Garcia, O. Boettcher, T. Bohare, A. Boldyrev, A. Bolognani, C.S. Bolzonella, R. Bondar, N. Borgato, F. Borghi, S. Borsato, M. Borsuk, J.T. Bouchiba, S.A. Bowcock, T.J.V. Boyer, A. Bozzi, C. Bradley, M.J. Brea Rodriguez, A. Breer, N. Brodzicka, J. Brossa Gonzalo, A. Brown, J. Brundu, D. Buchanan, E. Buonaura, A. Buonincontri, L. Burke, A.T. Burr, C. Butkevich, A. Butter, J.S. Buytaert, J. Byczynski, W. Cadeddu, S. Cai, H. Calabrese, R. Calderon Ramirez, S. Calefice, L. Cali, S. Calvi, M. Calvo Gomez, M. Camargo Magalhaes, P. Cambon Bouzas, J.I. Campana, P. Campora Perez, D.H. Campoverde Quezada, A.F. Capelli, S. Capriotti, L. Caravaca-Mora, R. Carbone, A. Carcedo Salgado, L. Cardinale, R. Cardini, A. Carniti, P. School of Physics and Astronomy Monash University Melbourne Australia Rio de Janeiro Brazil Rio de Janeiro Brazil Center for High Energy Physics Tsinghua University Beijing China Beijing China School of Physics State Key Laboratory of Nuclear Physics and Technology Peking University Beijing China University of Chinese Academy of Sciences Beijing China Institute of Particle Physics Central China Normal University Hubei Wuhan China San Jose Costa Rica Université Savoie Mont Blanc CNRS IN2P3-LAPP Annecy France Université Clermont Auvergne CNRS/IN2P3 LPC Clermont-Ferrand France Aix Marseille Univ CNRS/IN2P3 CPPM Marseille France Université Paris-Saclay CNRS/IN2P3 IJCLab Orsay France Laboratoire Leprince-Ringuet CNRS/IN2P3 Ecole Polytechnique Institut Polytechnique de Paris Palaiseau France LPNHE Sorbonne Université Paris Diderot Sorbonne Paris Cité CNRS/IN2P3 Paris France I. Physikalisches Institut RWTH Aachen University Aachen Germany Universität Bonn Helmholtz-Institut für Strahlen und Kernphysik Bonn Germany Fakultät Physik Technische Universität Dortmund Dortmund Germany Heidelberg Germany Physikalisches Institut Ruprecht-Karls-Universität Heidelberg Heidelberg Germany School of Physics University College Dublin Dublin Ireland INFN Sezione di Bari Bari Italy INFN Sezione di Bologna Bologna Italy INFN Sezione di Ferrara Ferrara Italy INFN Sezione di Firenze Firenze Italy INFN Laboratori Nazionali di Frascati Frascati Italy INFN Sezione di Genova Genova Italy INFN Sezione di Milano Milano Italy INFN Sezione di Milano-Bicocca Milano Italy INFN Sezione di Cagliari Monserrato Italy INFN Sezione di Padova Padova Italy INFN Sezione di Perugia Perugia Italy INFN Sezione di Pisa Pisa Italy INFN Sezione di Roma La Sapienza Roma Italy INFN Sezione di Roma Tor Vergata Roma Italy Nikhef National Institute for Subatomic Physics Amsterdam Netherlands Nikhef National Institute for Subatomic Physics VU University Amsterdam Amste

A measurement of time-dependent CP violation in D0 → π+π−π0 decays using a pp collision data sample collected by the LHCb experiment in 2012 and from 2015 to 2018, corresponding to an integrated luminosity of 7.7 fb−1, is presented. The initial flavour of each D0 candidate is determined from the charge of the pion produced in the D*(2010)+ → D0π+ decay. The decay D0 → K−π+π0 is used as a control channel to validate the measurement procedure. The gradient of the time-dependent CP asymmetry, ∆Y , in D0 → π+π−π0 decays is measured to be ∆Y = (−1.3 ± 6.3 ± 2.4) × 10−4, where the first uncertainty is statistical and the second is systematic, which is compatible with CP conservation. © 2024, CC BY.

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