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IEEE Symposium on Visual Analytics Science and Technology (VAST)

作者： Dirk Streeb Udo Schlegel Juri Buchmüller Fabian Fischer Daniel A. Keim Data Analysis and Visualization Group University of Konstanz Germany

This paper describes our approach and tools used to solve this year's VAST 2015 Mini-Challange 1 (MC1). It also explains how we came up with the idea for a new tool created for solving of the challenge and how this tool helps the user analyzing the data. Further, preprocessing steps will be discussed and how new features were created to be able to cluster guests in goups walking together. Finally findings of this visualization will be presented.

关键词： Image color analysis data visualization Visual analytics data analysis databases Feature extraction

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Applying visual analytics to explore and analyze movement data

Applying visual analytics to explore and analyze movement da...

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IEEE Symposium on Visual Analytics Science and Technology (VAST)

作者： Eren Cakmak Alexander Gärtner Thomas Hepp Juri Buchmüller Fabian Fischer Daniel A. Keim Data Analysis and Visualization Group University of Konstanz Germany

The VAST Challenge 2015 movement dataset is mirroring current challenges in the analysis of large spatiotemporal datasets. We present a tool featuring different exploratory approaches analyze and visualize spatiotemporal data to build and confirm hypotheses. Our tool helps the user to find patterns, anomalies and groups in a data set that can not be processed manually. We present custom visualizations to solve the tasks stated by the VAST 2015 Mini-Challenge (MC1).

关键词： data visualization Heating Visual analytics Image color analysis Spatiotemporal phenomena databases Time series analysis

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Visual analytics for inspecting the evolution of a graph over time: Pattern discovery in a communication network

Visual analytics for inspecting the evolution of a graph ove...

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IEEE Symposium on Visual Analytics Science and Technology (VAST)

作者： Bruno Schneider Carmela Acevedo Juri Buchmüller Fabian Fischer Daniel A. Keim Data Analysis and Visualization Group University of Konstanz Germany

We present two approaches developed to visually analyze and find patterns in a communication network. The work was done for the VAST 2015 Mini-Challenge 2 (MC2), featuring a dataset with records of timestamps as well as identification of sender and receiver of text messages. Further information included the location from which a message was sent in the fictional amusement park. In the first approach, we present the data preprocessing pipeline we used for a custom visualization. In the second approach, we present how we used available data preprocessing and visualization software to get a quick and clear overview of the problem, and how we used the generated findings to feed our custom visualizations.

关键词： data visualization Feature extraction Principal component analysis Visual analytics Communication networks Receivers

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Using visual analytics to provide situation awareness for movement and communication data

Using visual analytics to provide situation awareness for mo...

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IEEE Symposium on Visual Analytics Science and Technology (VAST)

作者： Juri Buchmüller Fabian Fischer Dirk Streeb Daniel A. Keim Data Analysis and Visualization Group University of Konstanz Germany

Analyzing and correlating movement and communication data is challenging. To gather insights and gain knowledge out of such datasets, we propose a visual analytics system. We apply automated clustering techniques and propose a combination of various visualizations to provide overviews. We support the analyst in exploring the data to eventually enhance situational awareness in complex analysis scenarios. To evaluate our approach, we apply our techniques in the context of the VAST 2015 Grand Challenge (GC). Within this challenge, we successfully identify suspicious patterns and interesting groups of distinctive behavior among visitors of an amusement park, and correlate them with their respective communication patterns to gain insights.

关键词： Visual analytics data visualization Heating Electronic mail data analysis Context

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Stabilization of polar nano regions in pb-free ferroelectrics

arXiv

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arXiv 2017年

作者： Pramanick, A. Dmowski, W. Egami, T. Setiadi Budisuharto, A. Weyland, F. Novak, N. Christianson, A.D. Borreguero, J.M. Abernathy, D.L. Jørgensen, M.R.V. Department of Materials Science and Engineering City University of Hong Kong Kowloon Hong Kong Shull Wollan Center Oak Ridge National Laboratory Oak RidgeTN United States Department of Materials Science and Engineering University of Tennessee Oak RidgeTN United States Institue of Material Science Technische Universität Darmstadt Darmstadt Germany Quantum Condensed Matter Division Oak Ridge National Laboratory Oak RidgeTN United States Neutron Data Analysis and Visualization Division Oak Ridge National Laboratory Oak RidgeTN United States Center for Materials Crystallography INano and Department of Chemistry Aarhus University Denmark MAX IV Laboratory Lund University Lund Sweden

Formation of polar nano regions through solid-solution additions are known to enhance significantly the functional properties of ferroelectric materials. Despite considerable progress in characterizing the microscopic behavior of polar nano regions, understanding their real-space atomic structure and dynamics of formation remains a considerable challenge. Here, using the method of dynamic pair distribution function, we provide direct insights into the role of solidsolution additions towards the stabilization of polar nano regions in the Pb-free ferroelectric of Ba(Zr, Ti)O3. It is shown that for an optimum level of substitution of Ti by larger Zr ions, the dynamics of atomic displacements for ferroelectric polarization are slowed sufficiently, which leads to increased local correlation among dipoles below THz frequencies. The dynamic pair distribution function technique demonstrates unique capability to obtain insights into locally correlated atomic dynamics in disordered materials, including new Pb-free ferroelectrics, which is necessary to understand and control their functional properties. Copyright © 2017, The Authors. All rights reserved.

关键词： Stabilization

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Quasi-two-dimensional spin correlations in the triangular lattice bilayer spin glass LuCoGaO4

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Physical Review B 2017年第9期96卷 094414-094414页

作者： K. Fritsch K. A. Ross G. E. Granroth G. Ehlers H. M. L. Noad H. A. Dabkowska B. D. Gaulin Helmholtz Zentrum Berlin für Materialien und Energie GmbH D-14109 Berlin Germany Department of Physics and Astronomy McMaster University Hamilton Ontario L8S 4M1 Canada Colorado State University Fort Collins Colorado 80523 USA Neutron Data Analysis and Visualization Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Quantum Condensed Matter Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Stanford University Stanford California 94305 USA Brockhouse Institute for Materials Research Hamilton Ontario L8S 4M1 Canada Canadian Institute for Advanced Research 661 University Ave Toronto Ontario M5G 1M1 Canada

We present a single-crystal time-of-flight neutron scattering study of the static and dynamic spin correlations in LuCoGaO4, a quasi-two-dimensional dilute triangular lattice antiferromagnetic spin-glass material. This system is based on Co2+ ions that are randomly distributed on triangular bilayers within the YbFe2O4-type, hexagonal crystal structure. Antiferromagnetic short-range two-dimensional correlations at wave vectors Q=1/3,1/3,L develop within the bilayers at temperatures as high as |ΘCW|∼100 K and extend over roughly five unit cells at temperatures below Tg=19 K. These two-dimensional static correlations are observed as diffuse rods of neutron scattering intensity along c* and display a continuous spin freezing process in their energy dependence. Aside from exhibiting these typical spin-glass characteristics, this insulating material reveals a novel gapped magnetic resonant spin excitation at ΔE∼12meV localized around Q=1/3,1/3,L. The temperature dependence of the spin gap associated with this two-dimensional excitation correlates with the evolution of the static correlations into the spin-glass state ground state. We associate it with the effect of the staggered exchange field acting on the Seff=1/2 Ising-like doublet of the Co2+ moments.

关键词： Frustrated magnetism Magnetism 2-dimensional systems Magnetic insulators Spin glasses Neutron scattering Time-of-flight neutron spectroscopy

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Magnetic frustration driven by itinerancy in spinel CoV2O4

arXiv

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arXiv 2017年

作者： Lee, J.H. Ma, J. Hahn, S.E. Cao, H.B. Hong, Tao Okamoto, S. Zhou, H.D. Matsuda, M. Fishman, R.S. School of Energy and Chemical Engineering Ulsan National Institute of Science and Technology Ulsan44919 Korea Republic of Materials Science and Technology Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Key Laboratory of Artificial Structures and Quantum Control Department of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Collaborative Innovation Center of Advanced Microstructures Nanjing Jiangsu210093 China Department of Physics and Astronomy University of Tennessee KnoxvilleTN37996 United States Neutron Data Analysis and Visualization Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Quantum Condensed Matter Division Oak Ridge National Laboratory Oak RidgeTN37831 United States

Localized spins and itinerant electrons rarely coexist in geometrically-frustrated spinel lattices. We show that the spinel CoV2O4 stands at the crossover from insulating to itinerant behavior and exhibits a complex interplay between localized spins and itinerant electrons. In contrast to the expected paramagnetism, localized spins supported by enhanced exchange couplings are frustrated by the effects of delocalized electrons. This frustration produces a non-collinear spin state and may be responsible for macroscopic spin-glass behavior. Competing phases can be uncovered by external perturbations such as pressure or magnetic field, which enhance the frustration. Copyright © 2017, The Authors. All rights reserved.

关键词： Cobalt compounds

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Efficient dense reconstruction using geometry and image consistency constraints

Efficient dense reconstruction using geometry and image cons...

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Applied Imagery Pattern Recognition Workshop (AIPR)

作者： Mikhail M. Shashkov Jason Mak Shawn Recker Connie Nguyen John Owens Kenneth I. Joy Institute for Data Analysis and Visualization University of California - Davis Davis California

We introduce a method for creating very dense reconstructions of datasets, particularly turn-table varieties. The method takes in initial reconstructions (of any origin) and makes them denser by interpolating depth values in two-dimensional image space within a superpixel region and then optimizing the interpolated value via image consistency analysis across neighboring images in the dataset. One of the core assumptions in this method is that depth values per pixel will vary gradually along a gradient for a given object. As such, turntable datasets, such as the dinosaur dataset, are particularly easy for our method. Our method modernizes some existing techniques and parallelizes them on a GPU, which produces results faster than other densification methods.

关键词： Image reconstruction Cameras Three-dimensional displays Interpolation Feature extraction Reconstruction algorithms Shape

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Magnetic ground state of the Ising-like antiferromagnet DyScO3

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Physical Review B 2017年第14期96卷 144407-144407页

作者： L. S. Wu S. E. Nikitin M. Frontzek A. I. Kolesnikov G. Ehlers M. D. Lumsden K. A. Shaykhutdinov E.-J. Guo A. T. Savici Z. Gai A. S. Sefat A. Podlesnyak Quantum Condensed Matter Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Max Planck Institute for Chemical Physics of Solids Nöthnitzer Strasse 40 01187 Dresden Germany Institut für Festkörper- und Materialphysik Technische Universität Dresden D-01069 Dresden Germany Chemical and Engineering Materials Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Kirensky Institute of Physics Federal Research Center SB RAS Krasnoyarsk 660036 Russia Neutron Data Analysis and Visualization Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Center for Nanophase Materials Sciences and Chemical Science Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Materials Science and Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA

We report on the low-temperature magnetic properties of the DyScO3 perovskite, which were characterized by means of single crystal and powder neutron scattering, and by magnetization measurements. Below TN=3.15 K, Dy3+ moments form an antiferromagnetic structure with an easy axis of magnetization lying in the ab plane. The magnetic moments are inclined at an angle of ∼±28∘ to the b axis. We show that the ground-state Kramers doublet of Dy3+ is made up of primarily |±15/2〉 eigenvectors and well separated by a crystal field from the first excited state at E1=24.9 meV. This leads to an extreme Ising single-ion anisotropy, M⊥/M∥∼0.05. The transverse magnetic fluctuations, which are proportional to M⊥2/M∥2, are suppressed, and only moment fluctuations along the local Ising direction are allowed. We also found that the Dy-Dy dipolar interactions along the crystallographic c axis are two to four times larger than in-plane interactions.

关键词： Antiferromagnetism Magnetic anisotropy Magnetic phase transitions Magnetism

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Surprising loss of three-dimensionality in low-energy spin correlations on approaching superconductivity in Fe1+yTe1−xSex

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Physical Review B 2017年第13期96卷 134505-134505页

作者： Zhijun Xu J. A. Schneeloch Jinsheng Wen B. L. Winn G. E. Granroth Yang Zhao Genda Gu Igor Zaliznyak J. M. Tranquada R. J. Birgeneau Guangyong Xu Condensed Matter Physics and Materials Science Department Brookhaven National Laboratory Upton New York 11973 USA NIST Center for Neutron Research National Institute of Standards and Technology Gaithersburg Maryland 20877 Department of Materials Science and Engineering University of Maryland College Park Maryland 20742 USA Physics Department University of California Berkeley California 94720 USA Materials Science Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Department of Physics Stony Brook University Stony Brook New York 11794 USA National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing 210093 China Quantum Condensed Matter Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA Neutron Data Analysis and Visualization Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA

We report inelastic neutron scattering measurements of low-energy (ℏω≲10 meV) magnetic excitations in the “11” system Fe1+yTe1−xSex. The spin correlations are two-dimensional (2D) in the superconducting samples at low temperature, but appear much more three-dimensional (3D) when the temperature rises well above Tc∼15 K, with a clear increase of the (dynamic) spin correlation length perpendicular to the Fe planes. This behavior is extremely unusual; typically, the suppression of thermal fluctuations at low temperature would favor the enhancement of 3D correlations, or even ordering, and the reversion to 2D cannot be naturally explained when only the spin degree of freedom is considered. Our results suggest that the low temperature physics in the 11 system, in particular the evolution of low-energy spin excitations towards superconducting pairing, intrinsically involves changes in orbital correlations.

关键词： Antiferromagnetism Superconductivity Unconventional superconductors Inelastic neutron scattering

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