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Compact localized states and flat-band generators in one dimension

Physical Review B 2017年第11期95卷 115135-115135页

作者： Wulayimu Maimaiti Alexei Andreanov Hee Chul Park Oleg Gendelman Sergej Flach Center for Theoretical Physics of Complex Systems Institute for Basic Science (IBS) Daejeon 34051 Republic of Korea Basic Science Program Korea University of Science and Technology (UST) Daejeon 34113 Republic of Korea Faculty of Mechanical Engineering Technion Haifa 3200003 Israel New Zealand Institute for Advanced Study Center for Theoretical Chemistry & Physics Massey University Auckland 0745 New Zealand

Flat bands (FB) are strictly dispersionless bands in the Bloch spectrum of a periodic lattice Hamiltonian, recently observed in a variety of photonic and dissipative condensate networks. FB Hamiltonians are fine-tuned networks, still lacking a comprehensive generating principle. We introduce a FB generator based on local network properties. We classify FB networks through the properties of compact localized states (CLS) which are exact FB eigenstates and occupy U unit cells. We obtain the complete two-parameter FB family of two-band d=1 networks with nearest unit cell interaction and U=2. We discover a novel high symmetry sawtooth chain with identical hoppings in a transverse dc field, easily accessible in experiments. Our results pave the way towards a complete description of FBs in networks with more bands and in higher dimensions.

关键词： Electronic structure 1-dimensional systems Electron-correlation calculations Lattice models in condensed matter

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The Role of Social Networks Theory and Methodology for Project Stakeholder Management

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Procedia - Social and Behavioral Sciences 2016年 226卷 372-380页

作者： Kon Shing Kenneth Chung Lynn Crawford Project Management Program & Centre for Complex Systems Faculty of Engineering & Information Technologies The University of Sydney NSW 2006 Australia

Stakeholder management is a key area in the management of projects. Correctly identifying key players, managing them and influencing them is crucial for the success of projects and programs. Often though, social networks and management literature has demonstrated that the process of work and ideas do not necessarily flow through organisational hierarchy, but rather through informal networks. In this paper, we discuss an overview of the stakeholder management approaches used and some of its limitations. We propose the use of social network theory and methodology is suggested as a viable perspective for stakeholder identification, analysis and management because of its theoretical and methodological rigour and its ability to provide insightful visualisations and useful network metrics to identify key influencers, bottlenecks, informal groups and so on.

关键词： social network analysis stakeholder management stakeholder identification stakeholder analysis

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Author Correction: Brain clocks capture diversity and disparities in aging and dementia across geographically diverse populations

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Nature medicine 2024年第12期30卷 3779页

作者： Sebastian Moguilner Sandra Baez Hernan Hernandez Joaquín Migeot Agustina Legaz Raul Gonzalez-Gomez Francesca R Farina Pavel Prado Jhosmary Cuadros Enzo Tagliazucchi Florencia Altschuler Marcelo Adrián Maito María E Godoy Josephine Cruzat Pedro A Valdes-Sosa Francisco Lopera John Fredy Ochoa-Gómez Alfredis Gonzalez Hernandez Jasmin Bonilla-Santos Rodrigo A Gonzalez-Montealegre Renato Anghinah Luís E d'Almeida Manfrinati Sol Fittipaldi Vicente Medel Daniela Olivares Görsev G Yener Javier Escudero Claudio Babiloni Robert Whelan Bahar Güntekin Harun Yırıkoğulları Hernando Santamaria-Garcia Alberto Fernández Lucas David Huepe Gaetano Di Caterina Marcio Soto-Añari Agustina Birba Agustin Sainz-Ballesteros Carlos Coronel-Oliveros Amanuel Yigezu Eduar Herrera Daniel Abasolo Kerry Kilborn Nicolás Rubido Ruaridh A Clark Ruben Herzog Deniz Yerlikaya Kun Hu Mario A Parra Pablo Reyes Adolfo M García Diana L Matallana José Alberto Avila-Funes Andrea Slachevsky María I Behrens Nilton Custodio Juan F Cardona Pablo Barttfeld Ignacio L Brusco Martín A Bruno Ana L Sosa Ortiz Stefanie D Pina-Escudero Leonel T Takada Elisa Resende Katherine L Possin Maira Okada de Oliveira Alejandro Lopez-Valdes Brian Lawlor Ian H Robertson Kenneth S Kosik Claudia Duran-Aniotz Victor Valcour Jennifer S Yokoyama Bruce Miller Agustin Ibanez Latin American Brain Health Institute Universidad Adolfo Ibañez Santiago de Chile Chile. Cognitive Neuroscience Center Universidad de San Andrés Buenos Aires Argentina. Department of Neurology Massachusetts General Hospital and Harvard Medical School Boston MA USA. Universidad de los Andes Bogota Colombia. Global Brain Health Institute (GBHI) University of California San Francisco CA USA. Global Brain Health Institute (GBHI) Trinity College Dublin Dublin Ireland. The University of California Santa Barbara (UCSB) Santa Barbara CA USA. Escuela de Fonoaudiología Universidad San Sebastián Santiago de Chile Chile. Grupo de Bioingeniería Decanato de Investigación Universidad Nacional Experimental del Táchira San Cristóbal Venezuela. Advanced Center for Electrical and Electronic Engineering Universidad Técnica Federico Santa María Valparaíso Chile. University of Buenos Aires Buenos Aires Argentina. The Clinical Hospital of Chengdu Brain Sciences Institute University of Electronic Sciences and Technology of China Chengdu China. Technology of China Chengdu China. Cuban Neuroscience Center La Habana Cuba. Grupo de Neurociencias de Antioquia (GNA) University of Antioquia Medellín Colombia. Department of Psychology Master Program of Clinical Neuropsychology Universidad Surcolombiana Neiva Neiva Colombia. Department of Psychology Universidad Cooperativa de Colombia Arauca Colombia. Neurocognition and Psychophysiology Laboratory Universidad Surcolombiana Neiva Colombia. Reference Center of Behavioural Disturbances and Dementia School of Medicine University of Sao Paulo Sao Paulo Brazil. Traumatic Brain Injury Cognitive Rehabilitation Out-Patient Center University of Sao Paulo Sao Paulo Brazil. Center for Social and Cognitive Neuroscience School of Psychology Universidad Adolfo Ibáñez Santiago Chile. Neuropsychology and Clinical Neuroscience Laboratory (LANNEC) Physiopathology Program-Institute of Biomedical Sciences (ICBM) Neuroscience and East Neuroscience Dep

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Dynamical patterns in active nematics on a sphere

arXiv

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arXiv 2017年

作者： Henkes, Silke Cristina Marchetti, M. Sknepnek, Rastko Institute of Complex Systems and Mathematical Biology Department of Physics University of Aberdeen AberdeenAB24 3UE United Kingdom Department of Physics and Soft Matter Program Syracuse University SyracuseNY13244 United States School of Sciences and Engineering School of Life Sciences University of Dundee DundeeDD1 4HN United Kingdom

Using agent-based simulations of self-propelled particles subject to short-range repulsion and nematic alignment we explore the dynamical phases of a dense active material confined to the surface of a sphere. We map the dynamical phase diagram as a function of curvature, alignment strength and activity and reproduce phases seen in recent experiments on active microtubules moving on the surfaces of vesicles. At low driving, we recover the equilibrium nematic ground state with four +1/2 defects. As the driving is increased, geodesic forces drive the transition to a band of polar matter wrapping around an equator, with large bald spots corresponding to two +1 defects at the poles. Finally, bands fold onto themselves, followed by the system moving into a turbulent state marked by active proliferation of pairs of topological defects. We highlight the role of nematic persistence length and time for pattern formation in these confined systems with finite curvature. Copyright © 2017, The Authors. All rights reserved.

关键词： Ground state

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Author Correction: MusMorph, a database of standardized mouse morphology data for morphometric meta-analyses

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Scientific data 2023年第1期10卷 420页

作者： Jay Devine Marta Vidal-García Wei Liu Amanda Neves Lucas D Lo Vercio Rebecca M Green Heather A Richbourg Marta Marchini Colton M Unger Audrey C Nickle Bethany Radford Nathan M Young Paula N Gonzalez Robert E Schuler Alejandro Bugacov Campbell Rolian Christopher J Percival Trevor Williams Lee Niswander Anne L Calof Arthur D Lander Axel Visel Frank R Jirik James M Cheverud Ophir D Klein Ramon Y Birnbaum Amy E Merrill Rebecca R Ackermann Daniel Graf Myriam Hemberger Wendy Dean Nils D Forkert Stephen A Murray Henrik Westerberg Ralph S Marcucio Benedikt Hallgrímsson Alberta Children's Hospital Research Institute University of Calgary 28 Oki Dr NW Calgary AB T3B 6A8 Canada. The McCaig Institute for Bone and Joint Health University of Calgary 3280 Hospital Dr NW Calgary AB T2N 4Z6 Canada. Department of Cell Biology and Anatomy Cumming School of Medicine University of Calgary 3330 Hospital Dr NW Calgary AB T2N 4N1 Canada. Department of Biology McMaster University 1280 Main St W Hamilton ON L8S 4L8 Canada. School of Dental Medicine University of Pittsburgh 3501 Terrace St Pittsburgh PA 15213 USA. Orthopaedic Trauma Institute ZSFG UCSF 2550 23rd St San Francisco CA 94110 USA. Department of Biological Sciences University of Calgary 2500 University Dr NW Calgary AB T2N 1N4 Canada. Center for Craniofacial Molecular Biology Department of Biomedical Sciences Herman Ostrow School of Dentistry University of Southern California Los Angeles 2250 Alcazar St Los Angeles CA 90033 USA. Department of Biochemistry and Molecular Medicine Keck School of Medicine University of Southern California Los Angeles 1975 Zonal Ave Los Angeles CA 90033 USA. Department of Biochemistry and Molecular Biology Cumming School of Medicine University of Calgary 3330 Hospital Dr NW Calgary AB T2N 4N1 Canada. Institute for Studies in Neuroscience and Complex Systems (ENyS) CONICET Av. Calchaquí 5402 Florencio Varela Buenos Aires Argentina. Information Sciences Institute Viterbi School of Engineering University of Southern California 4676 Admiralty Way Marina del Rey CA 90292 USA. Department of Comparative Biology and Experimental Medicine Faculty of Veterinary Medicine University of Calgary 3330 Hospital Dr NW Calgary AB T2N 4N1 Canada. Department of Anthropology Stony Brook University 100 Nicolls Rd Stony Brook NY 11794 USA. Department of Craniofacial Biology University of Colorado Anschutz Medical Campus 12801 East 17th Ave Aurora CO 80045 USA. Department of Molecular Cellular and Developmental Biology University o

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Magnons and Phonons Optically Driven out of Local Equilibrium in a Magnetic Insulator

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Physical Review Letters 2016年第10期117卷 107202-107202页

作者： Kyongmo An Kevin S. Olsson Annie Weathers Sean Sullivan Xi Chen Xiang Li Luke G. Marshall Xin Ma Nikita Klimovich Jianshi Zhou Li Shi Xiaoqin Li Department of Physics Center for Complex Quantum Systems The University of Texas at Austin Austin Texas 78712 USA Department of Mechanical Engineering The University of Texas at Austin Austin Texas 78712 USA Materials Science and Engineering Program Texas Materials Institute The University of Texas at Austin Austin Texas 78712 USA

The coupling and possible nonequilibrium between magnons and other energy carriers have been used to explain several recently discovered thermally driven spin transport and energy conversion phenomena. Here, we report experiments in which local nonequilibrium between magnons and phonons in a single crystalline bulk magnetic insulator, Y3Fe5O12, has been created optically within a focused laser spot and probed directly via micro-Brillouin light scattering. Through analyzing the deviation in the magnon number density from the local equilibrium value, we obtain the diffusion length of thermal magnons. By explicitly establishing and observing local nonequilibrium between magnons and phonons, our studies represent an important step toward a quantitative understanding of various spin-heat coupling phenomena.

关键词： Spin Seebeck effect Spin caloritronics Spintronics Magnetic insulators Brillouin scattering & spectroscopy Fabry-Pérot interferometry

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Author Correction: Liquid crystal elastomer coatings with programmed response of surface profile

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Nature communications 2018年第1期9卷 1130页

作者： Greta Babakhanova Taras Turiv Yubing Guo Matthew Hendrikx QiHuo Wei Albert P H J Schenning Dirk J Broer Oleg D Lavrentovich Liquid Crystal Institute Kent State University Kent OH 44242 USA. Chemical Physics Interdisciplinary Program Kent State University Kent OH 44242 USA. Functional Organic Materials and Devices Department of Chemical Engineering and Chemistry Eindhoven University of Technology 5612 AZAE Eindhoven The Netherlands. Institute for Complex Molecular Systems Eindhoven University of Technology P.O. Box 513 5600 MB Eindhoven The Netherlands. Liquid Crystal Institute Kent State University Kent OH 44242 USA. olavrent@kent.edu. Chemical Physics Interdisciplinary Program Kent State University Kent OH 44242 USA. olavrent@kent.edu. Department of Physics Kent State University Kent OH 44242 USA. olavrent@kent.edu.

The original version of this Article contained errors in Figs. 1a, 2a, 3a, and 4b, in which the units on the scale bars incorrectly read 'µm' rather than the correct 'nm.' This has been corrected ... 详细信息

关键词： Liquid crystals Polymers

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Influence of water saturation on ultrasonic P-wave velocity in weakly compacted sandstone

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Journal of Physics: Conference Series 2017年第1期795卷

作者： Thaqibul Fikri Niyartama Umar Fauzi Fatkhan Physics Study Program Universitas Islam Negeri Sunan Kalijaga Yogyakarta Jl. MarsdaAdiSucipto No. 1 Yogyakarta 55281 INDONESIA Physics of Earth and Complex Systems ITB Jl. Ganesha 10. Bandung 40132 INDONESIA Geophysics Engineering ITB Jl. Ganesha 10. Bandung 40132 INDONESIA

Laboratory measurements of Ultrasonic P-wave velocities were conducted in weakly compacted sandstone with varying degree of water saturations. We used P wave transducer at frequency 63 kHz and imbibition technique in order to study the influence of water saturation on the P-wave velocity. Our experiment showed that the P-wave velocity (Vp) was reduced significantly at the beginning of the imbibition process. The variations on travel times and the amplitude changes were detected at any degree of saturation. The first and second amplitude of P wave decreased as water saturation (Sw ) increased in the range of 0.1 to 0.6 in B5 sample, the amplitude increased again afterward. The shifting peaks of the signal that indicated attenuation were also observed in the experimental.

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Genetic drivers of heterogeneity in type 2 diabetes pathophysiology

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Nature 2024年第8003期627卷 347-357页

作者： Ken Suzuki Konstantinos Hatzikotoulas Lorraine Southam Henry J Taylor Xianyong Yin Kim M Lorenz Ravi Mandla Alicia Huerta-Chagoya Giorgio E M Melloni Stavroula Kanoni Nigel W Rayner Ozvan Bocher Ana Luiza Arruda Kyuto Sonehara Shinichi Namba Simon S K Lee Michael H Preuss Lauren E Petty Philip Schroeder Brett Vanderwerff Mart Kals Fiona Bragg Kuang Lin Xiuqing Guo Weihua Zhang Jie Yao Young Jin Kim Mariaelisa Graff Fumihiko Takeuchi Jana Nano Amel Lamri Masahiro Nakatochi Sanghoon Moon Robert A Scott James P Cook Jung-Jin Lee Ian Pan Daniel Taliun Esteban J Parra Jin-Fang Chai Lawrence F Bielak Yasuharu Tabara Yang Hai Gudmar Thorleifsson Niels Grarup Tamar Sofer Matthias Wuttke Chloé Sarnowski Christian Gieger Darryl Nousome Stella Trompet Soo-Heon Kwak Jirong Long Meng Sun Lin Tong Wei-Min Chen Suraj S Nongmaithem Raymond Noordam Victor J Y Lim Claudia H T Tam Yoonjung Yoonie Joo Chien-Hsiun Chen Laura M Raffield Bram Peter Prins Aude Nicolas Lisa R Yanek Guanjie Chen Jennifer A Brody Edmond Kabagambe Ping An Anny H Xiang Hyeok Sun Choi Brian E Cade Jingyi Tan K Alaine Broadaway Alice Williamson Zoha Kamali Jinrui Cui Manonanthini Thangam Linda S Adair Adebowale Adeyemo Carlos A Aguilar-Salinas Tarunveer S Ahluwalia Sonia S Anand Alain Bertoni Jette Bork-Jensen Ivan Brandslund Thomas A Buchanan Charles F Burant Adam S Butterworth Mickaël Canouil Juliana C N Chan Li-Ching Chang Miao-Li Chee Ji Chen Shyh-Huei Chen Yuan-Tsong Chen Zhengming Chen Lee-Ming Chuang Mary Cushman John Danesh Swapan K Das H Janaka de Silva George Dedoussis Latchezar Dimitrov Ayo P Doumatey Shufa Du Qing Duan Kai-Uwe Eckardt Leslie S Emery Daniel S Evans Michele K Evans Krista Fischer James S Floyd Ian Ford Oscar H Franco Timothy M Frayling Barry I Freedman Pauline Genter Hertzel C Gerstein Vilmantas Giedraitis Clicerio González-Villalpando Maria Elena González-Villalpando Penny Gordon-Larsen Myron Gross Lindsay A Guare Sophie Hackinger Liisa Hakaste Sohee Han Andrew T Hattersley Christian Herder Momoko Horikoshi Annie-Green Howard Willa Centre for Genetics and Genomics Versus Arthritis Centre for Musculoskeletal Research Division of Musculoskeletal and Dermatological Sciences University of Manchester Manchester UK. Department of Diabetes and Metabolic Diseases Graduate School of Medicine University of Tokyo Tokyo Japan. Department of Statistical Genetics Osaka University Graduate School of Medicine Suita Japan. Institute of Translational Genomics Helmholtz Zentrum München German Research Center for Environmental Health Neuherberg Germany. konstantinos.hatzikotoulas@helmholtz-munich.de. Institute of Translational Genomics Helmholtz Zentrum München German Research Center for Environmental Health Neuherberg Germany. Center for Precision Health Research National Human Genome Research Institute National Institutes of Health Bethesda MD USA. British Heart Foundation Cardiovascular Epidemiology Unit Department of Public Health and Primary Care University of Cambridge Cambridge UK. Heart and Lung Research Institute University of Cambridge Cambridge UK. Department of Epidemiology School of Public Health Nanjing Medical University Nanjing China. Department of Biostatistics and Center for Statistical Genetics University of Michigan Ann Arbor MI USA. Corporal Michael J. Crescenz VA Medical Center Philadelphia PA USA. Department of Systems Pharmacology and Translational Therapeutics University of Pennsylvania Perelman School of Medicine Philadelphia PA USA. Department of Genetics University of Pennsylvania Perelman School of Medicine Philadelphia PA USA. Programs in Metabolism and Medical and Population Genetics Broad Institute of Harvard and MIT Cambridge MA USA. Diabetes Unit and Center for Genomic Medicine Massachusetts General Hospital Boston MA USA. TIMI Study Group Division of Cardiovascular Medicine Brigham and Women's Hospital Harvard Medical School Boston MA USA. William Harvey Research Institute Barts and the London School of Medicine and Dentistry Queen Mary University of London L

Type 2 diabetes (T2D) is a heterogeneous disease that develops through diverse pathophysiological processes and molecular mechanisms that are often specific to cell type. Here, to characterize the genetic contribution to these processes across ancestry groups, we aggregate genome-wide association study data from 2,535,601 individuals (39.7% not of European ancestry), including 428,452 cases of T2D. We identify 1,289 independent association signals at genome-wide significance (P < 5 × 10) that map to 611 loci, of which 145 loci are, to our knowledge, previously unreported. We define eight non-overlapping clusters of T2D signals that are characterized by distinct profiles of cardiometabolic trait associations. These clusters are differentially enriched for cell-type-specific regions of open chromatin, including pancreatic islets, adipocytes, endothelial cells and enteroendocrine cells. We build cluster-specific partitioned polygenic scores in a further 279,552 individuals of diverse ancestry, including 30,288 cases of T2D, and test their association with T2D-related vascular outcomes. Cluster-specific partitioned polygenic scores are associated with coronary artery disease, peripheral artery disease and end-stage diabetic nephropathy across ancestry groups, highlighting the importance of obesity-related processes in the development of vascular outcomes. Our findings show the value of integrating multi-ancestry genome-wide association study data with single-cell epigenomics to disentangle the aetiological heterogeneity that drives the development and progression of T2D. This might offer a route to optimize global access to genetically informed diabetes care.

关键词： Computational biology and bioinformatics Diabetes Genetic markers Genome-wide association studies

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Conception d'un systeme innovant pour controler les fonctions d'un vehicule a distance

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UPB Scientific Bulletin, Series D: Mechanical engineering 2015年第2期77卷 167-178页

作者： Abaza, Bogdan Spiroiu, Marius Stanciu, Camelia Serban, Dragos Plutasu, Irina Ghencea, Raluca Popa, Alexandru Galitu, Eugen Faculty of Engineering and Management of Technological Systems University POLITEHNICA of Bucharest Romania University POLITEHNICA of Bucharest Master Program Engineering and Management of Complex Projects Romania

The present paper deals with the development of an innovative product achieved in the frame of one semester project managed by a team of master students accompanied by their teachers in a project-based learning. The aim of the study is to manage the development of an innovative system which enables the user to command and communicate with his car from distance. All innovation management and business strategy phases are covered, from the analysis of user needs to product technical functions, production cost and prototype achievement.

关键词： Teaching

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