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Author Correction: WOODIV, a database of occurrences, functional traits, and phylogenetic data for all Euro-Mediterranean trees

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Scientific data 2021年第1期8卷 128页

作者： Anne-Christine Monnet Kévin Cilleros Frédéric Médail Marwan Cheikh Albassatneh Juan Arroyo Gianluigi Bacchetta Francesca Bagnoli Zoltán Barina Manuel Cartereau Nicolas Casajus Panayotis Dimopoulos Gianniantonio Domina Aggeliki Doxa Marcial Escudero Bruno Fady Arndt Hampe Vlado Matevski Stephen Misfud Toni Nikolic Daniel Pavon Anne Roig Estefania Santos Barea Ilaria Spanu Arne Strid Giovanni Giuseppe Vendramin Agathe Leriche Aix Marseille Univ Avignon Univ CNRS IRD IMBE. Technopôle de l'Arbois-Méditerranée cedex 4 BP 80 13 545 Aix-en-Provence France. monnet.annechristine@***. Aix Marseille Univ Avignon Univ CNRS IRD IMBE. Technopôle de l'Arbois-Méditerranée cedex 4 BP 80 13 545 Aix-en-Provence France. Institut de Systématique Evolution Biodiversité (ISYEB) Muséum national d'Histoire naturelle (MNHN) CNRS Sorbonne Université EPHE Université des Antilles Paris France. Department of Plant Biology and Ecology University of Seville Seville Spain. Department of Life and Environmental Sciences University of Cagliari Viale Sant'Ignazio da Laconi 13 Cagliari Italy. National Research Council Institute of Biosciences and Bioresources 50019 Sesto Fiorentino (FI) Italy. Department of Botany Hungarian Natural History Museum Pf. 137 Budapest 1431 Hungary. FRB-CESAB 5 rue de l'Ecole de Médecine 34000 Montpellier France. Department of Biology Laboratory of Botany University of Patras 26504 Patras Greece. Department of Agriculture Food and Forest Sciences University of Palermo Viale delle Scienze bldg. 4 90128 Palermo Italy. Statistical Learning Lab Institute of Applied and Computational Mathematics Foundation for Research and Technology-Hellas (FORTH) Ν. Plastira 100 Vassilika Vouton GR - 700 13 Heraklion Crete Greece. INRAE UR629 Ecologie des forêts méditerranéennes Avignon France. INRAE Univ. Bordeaux BIOGECO F-33610 Cestas France. Macedonian Academy of Sciences and Arts Krste Misirkov 2 1000 Skopje Republic of Macedonia. EcoGozo Regional Development Directorate - Ministry for Gozo Flat 6 Sunset Court B Triq Marsalforn Xaghra Gozo Malta. Department of Botany Faculty of Science University of Zagreb Zagreb Croatia. Bakkevej 6 5853 Ørbæk Denmark. Aix Marseille Univ Avignon Univ CNRS IRD IMBE. Technopôle de l'Arbois-Méditerranée cedex 4 BP 80 13 545 Aix-en-Provence France. agathe.leriche@imbe.fr.

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Ground-state phase diagram of an anisotropic spin-1/2 model on the triangular lattice

arXiv

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arXiv 2017年

作者： Luo, Qiang Hu, Shijie Xi, Bin Zhao, Jize Wang, Xiaoqun Department of Physics Renmin University of China Beijing100872 China Department of Physics and Research Center Optimas Technical University Kaiserslautern Kaiserslautern67663 Germany College of Physics Science and Technology Yangzhou University Yangzhou225002 China Institute of Applied Physics and Computational Mathematics Beijing100088 China Department of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Collaborative Innovation Center for Advanced Microstructures Nanjing210093 China

Motivated by the recent experiment on a rare-earth material YbMgGaO4 [Y. Li et al., Phys. Rev. Lett. 115, 167203 (2015)], which found that the ground state of YbMgGaO4 is a quantum spin liquid, we study the ground-state phase diagram of an anisotropic spin-1/2 model that was proposed to describe YbMgGaO4. Using the density-matrix renormalization group method in combination with the exact diagonalization, we calculate a variety of physical quantities, including the ground-state energy, the fidelity, the entanglement entropy and spin-spin correlation functions. Our studies show that in the quantum phase diagram there is a 120◦ phase and two distinct stripe phases. The transitions from the two stripe phases to the 120◦ phase are of the first order. However, the transition between the two stripe phases is not the first order, which is different from its classical counterpart. Additionally, we find no evidence for a quantum spin liquid in this model. Our results suggest that additional terms may be also important to model the material YbMgGaO4. These findings will stimulate further experimental and theoretical works in understanding the quantum spin liquid ground state in YbMgGaO4. Copyright © 2017, The Authors. All rights reserved.

关键词： Ytterbium compounds

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Robust and scalable bayes via a median of subset posterior measures

The Journal of Machine Learning Research

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The Journal of Machine Learning Research 2017年第1期18卷

作者： Stanislav Minsker Sanvesh Srivastava Lizhen Lin David B. Dunson Department of Mathematics University of Southern California Los Angeles CA Department of Statistics and Actuarial Science University of Iowa Iowa City IA Department of Applied and Computational Mathematics and Statistics The University of Notre Dame Notre Dame IN Departments of Statistical Science Mathematics and ECE Duke University Durham NC

We propose a novel approach to Bayesian analysis that is provably robust to outliers in the data and often has computational advantages over standard methods. Our technique is based on splitting the data into non-overlapping subgroups, evaluating the posterior distribution given each independent subgroup, and then combining the resulting measures. The main novelty of our approach is the proposed aggregation step, which is based on the evaluation of a median in the space of probability measures equipped with a suitable collection of distances that can be quickly and efficiently evaluated in practice. We present both theoretical and numerical evidence illustrating the improvements achieved by our method.

关键词： Wasserstein distance big data distributed computing geometric median parallel MCMC

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Engineering Sensorial Delay to Control Phototaxis and Emergent Collective Behaviors

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Physical Review X 2016年第1期6卷 011008-011008页

作者： Mite Mijalkov Austin McDaniel Jan Wehr Giovanni Volpe Soft Matter Lab Department of Physics Bilkent University Cankaya 06800 Ankara Turkey UNAM-National Nanotechnology Research Center Bilkent University Ankara 06800 Turkey Department of Mathematics and Program in Applied Mathematics University of Arizona Tucson Arizona 85721 USA

Collective motions emerging from the interaction of autonomous mobile individuals play a key role in many phenomena, from the growth of bacterial colonies to the coordination of robotic swarms. For these collective behaviors to take hold, the individuals must be able to emit, sense, and react to signals. When dealing with simple organisms and robots, these signals are necessarily very elementary; e.g., a cell might signal its presence by releasing chemicals and a robot by shining light. An additional challenge arises because the motion of the individuals is often noisy; e.g., the orientation of cells can be altered by Brownian motion and that of robots by an uneven terrain. Therefore, the emphasis is on achieving complex and tunable behaviors from simple autonomous agents communicating with each other in robust ways. Here, we show that the delay between sensing and reacting to a signal can determine the individual and collective long-term behavior of autonomous agents whose motion is intrinsically noisy. We experimentally demonstrate that the collective behavior of a group of phototactic robots capable of emitting a radially decaying light field can be tuned from segregation to aggregation and clustering by controlling the delay with which they change their propulsion speed in response to the light intensity they measure. We track this transition to the underlying dynamics of this system, in particular, to the ratio between the robots’ sensorial delay time and the characteristic time of the robots’ random reorientation. Supported by numerics, we discuss how the same mechanism can be applied to control active agents, e.g., airborne drones, moving in a three-dimensional space. Given the simplicity of this mechanism, the engineering of sensorial delay provides a potentially powerful tool to engineer and dynamically tune the behavior of large ensembles of autonomous mobile agents; furthermore, this mechanism might already be at work within living organisms such as chemo

关键词： Pattern formation Active matter Coarse graining Exact solutions for many-body systems Imaging & optical processing Molecular dynamics

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Time evolution of the population distribution in charge exchange collisions

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Journal of Physics: Conference Series 2017年第10期875卷

作者： Kento Shimada Naoki Numadate Yoshiyuki Uchikura Takuto Akutsu Ling Liu Jianguo Wang Hajime Tanuma Department of Physics Tokyo Metropolitan University Hachioji Tokyo 192-0397 Japan Institute of Applied Physics and Computational Mathematics Beijing 100088 China

We have calculated the population distributions of many electronic excite states as a function of time in collisions of bare, hydrogen-like and helium-like C, N and O ions with neutral targets, H, He, and H2. Using the population distribution, we have calculated theoretical emission spectra in the collision system. Comparing the theoretical spectra with the observation, we have estimated the detection efficiency of the spectrometer and discuss the singlet-triplet ratio in charge exchange collisions of hydrogen-like ions.

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Strong Edge Magnetism and Tunable Energy Gaps in Zigzag Graphene Quantum Dots with High Stability

arXiv

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arXiv 2017年

作者： Hu, Wei Huang, Yi Lin, Lin Kan, Erjun Li, Xingxing Yang, Chao Yang, Jinlong Computational Research Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Applied Physics Xi'an Jiaotong University Xi'an Shaanxi710049 China Department of Mathematics University of California BerkeleyCA94720 United States Department of Applied Physics and Institution of Energy and Microstructure Nanjing University of Science and Technology Nanjing Jiangsu210094 China Department of Chemical Physics Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Hefei National Laboratory for Physical Sciences at Microscale Hefei Anhui230026 China

Graphene is a nonmagnetic semimetal and cannot be directly used as electronic or spintronic devices. We demonstrate that graphene quantum dots (GQDs) can exhibit strong edge magnetism and tunable energy gaps due to the presence of localized edge states. By using large-scale first principle density functional theory (DFT) calculations and detailed analysis based on model Hamiltonians, we can show that the zigzag edge states in GQDs become much stronger and more localized as the system size increases. The enhanced edge states induce strong electron-electron interactions along the edges of GQDs, ultimately resulting in a magnetic phase transition from nonmagnetic to intraedge ferromagnetic and inter-edge antiferromagnetic, when the diameter is larger than 4.5 nm. Our analysis shows that the inter-edge superexchange interaction of antiferromagnetic states between two nearest-neighbor zigzag edges in GQDs is much stronger than that exists between two parallel zigzag edges in GQDs and graphene nanoribbons. Furthermore, such strong and localized edge states also induce GQDs semiconducting with tunable energy gaps, mainly controlled by adjusting the system size. Our results show that the quantum confinement effect, inter-edge superexchange (antiferromagnetic), and intra-edge direct exchange (ferromagnetic) interactions are crucial for the electronic and magnetic properties of zigzag GQDs at the nanoscale. Copyright © 2017, The Authors. All rights reserved.

关键词： Semiconductor quantum dots

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Erratum to: Daphnia revisited: local stability and bifurcation theory for physiologically structured population models explained by way of an example

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Journal of mathematical biology 2017年第1期75卷 259-261页

作者： Odo Diekmann Mats Gyllenberg J A J Metz Shinji Nakaoka André M de Roos Department of Mathematics University of Utrecht P.O. Box 80010 3508 TA Utrecht The Netherlands. Department of Mathematics and Statistics University of Helsinki P.O. Box 68 00014 Helsinki Finland. Institute of Biology and Institute of Mathematics Leiden University P.O. Box 9516 2300 RA Leiden The Netherlands. Evolution and Ecology Program International Institute of Applied Systems Analysis 2361 Laxenburg Austria. Graduate School of Medicine University of Tokyo 7-3-1 Hongo Bunkyo-ku Tokyo 113-0033 Japan. snakaoka@m.u-tokyo.ac.jp. Institute for Biodiversity and Ecosystem Dynamics University of Amsterdam P.O. Box 94248 1090 GE Amsterdam The Netherlands.

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Tuning the Morphology and Chiroptical Properties of Discrete Gold Nanorods with Amino Acids

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Angewandte Chemie 2018年第50期130卷

作者： Guangchao Zheng Zhiyong Bao Jorge Pérez‐Juste Ruolan Du Wei Liu Jiyan Dai Wei Zhang Lawrence Yoon Suk Lee Kwok‐Yin Wong State Key Laboratory of Chemical Biology and Drug Discovery Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic University Hunghom Kowloon Hong Kong China Department of Applied Physics The Hong Kong Polytechnic University Hunghom Kowloon Hong Kong China Departamento de Química Física y Centro Singular de Investigaciones Biomédicas (CINBIO) Universidad de Vigo Vigo Spain Institute of Applied Physics and Computational Mathematics P. O. Box 8009(28) Beijing 100088 P. R. China

The synthesis of discrete nanostructures with a strong, persistent, stable plasmonic circular dichroism (PCD) signal is challenging. We report a seed‐mediated growth approach to obtain discrete Au nanorods with high and stable chiroptical responses (c‐Au NRs) in the visible to near‐IR region. The morphology of the c‐Au NRs was governed by the concentration of l ‐ or d ‐cysteine used. The amino acids encapsulated within the discrete gold nanostructure enhance their PCD signal, attributed to coupling of dipoles of chiral molecules with the near‐field induced optical activity at the hot spots inside the c‐Au NRs. The stability of the PCD signal and biocompatibility of c‐Au NRs was improved by coating with silica or protein corona. Discrete c‐Au NR@SiO 2 with Janus or core–shell configurations retained their PCD signal even in organic solvents. A side‐by‐side assembly of c‐Au NRs induced by l ‐glutathione led to further PCD signal enhancement, with anisotropic g factors as high as 0.048.

关键词： Aminosäuren Bioverträglichkeit Chiroptische Eigenschaften Gold-Nanostäbe Morphologie

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Benchmarking atomic data for astrophysics: Be-like ions between B II and Ne VII

arXiv

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arXiv 2017年

作者： Wang, Kai Chen, Zhan Bin Zhang, Chun Yu Si, Ran Jnsson, Per Hartman, Henrik Gu, Ming Feng Chen, Chong Yang Yan, Jun Hebei Key Lab of Optic-electronic Information and Materials College of Physics Science and Technology Hebei University Baoding071002 China Group for Materials Science and Applied Mathematics Malmö University MalmoSE-20506 Sweden Shanghai EBIT Lab Key Laboratory of Nuclear Physics and Ion-beam Application Institute of Modern Physics Department of Nuclear Science and Technology Fudan University Shanghai200433 China College of Science Hunan University of Technology Zhuzhou412000 China Space Science Laboratory University of California BerkeleyCA94720 United States Institute of Applied Physics and Computational Mathematics Beijing100088 China Center for Applied Physics and Technology Peking University Beijing100871 China Shanghai Jiao Tong University Shanghai200240 China

Large-scale self-consistent multiconfiguration Dirac-Hartree-Fock and relativistic configuration interaction calculations are reported for the n ≤ 6 levels in Be-like ions from B II to Ne VII. Effects from electron correlation are taken into account by means of large expansions in terms of a basis of configuration state functions, and a complete and accurate data set of excitation energies, lifetimes, wavelengths, and electric dipole, magnetic dipole, electric quadrupole, and magnetic quadrupole line strengths, transition rates, and oscillator strengths for these levels is provided for each ion. Comparisons are made with available experimental and theoretical results. The uncertainty of excitation energies is assessed to be 0.01% on average, which makes it possible to find and rule out misidentifications and aid new line identifications involving high-lying levels in astrophysical spectra. The complete data set is also useful for modeling and diagnosing astrophysical plasmas. Copyright © 2017, The Authors. All rights reserved.

关键词： Ions

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Thermodynamics of a spin-12 XYZ Heisenberg chain with a Dzyaloshinskii-Moriya interaction

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Physical Review B 2017年第1期95卷 014405-014405页

作者： Bin Xi Shijie Hu Qiang Luo Jize Zhao Xiaoqun Wang College of Physics Science and Technology Yangzhou University Yangzhou 225002 China Department of Physics and Beijing Laboratory of Opto-Electronic Functional Materials and Micro-Nano Devices Renmin University of China Beijing 100872 China Department of Physics and Research Center Optimas Technical University Kaiserslautern 67663 Kaiserslautern Germany Institute of Applied Physics and Computational Mathematics Beijing 100088 China Department of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China China and Collaborative Innovation Center for Advanced Microstructures Nanjing 210093 China

We study the thermodynamics of a spin-1/2 XYZ Heisenberg chain with a Dzyaloshinskii-Moriya interaction. This model describes the low-energy behaviors of a one-dimensional two-component bosonic model with a synthetic spin-orbit coupling in the deep insulating region. In the limit U′/U→∞, where U is the strength of the onsite intracomponent repulsion and U′ is the intercomponent one, we solve our model exactly by Jordan-Wigner transformation, and thus provide a benchmark for our following numerical approach. In other cases, we calculate the entropy and the specific heat numerically by the transfer-matrix renormalization-group method. Their low-temperature behaviors depend crucially on the properties of the zero-temperature phases. A refined ground-state phase diagram is then deduced from their low-temperature behaviors. Our findings offer an alternative way to detect those distinguishable phases experimentally.

关键词： Antiferromagnetism Bose gases Ferromagnetism Insulators Magnetic order Magnetic phase transitions Phase transitions Spin-orbit coupling

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