DOCSLIB.ORG

XSEDE QUARTERLY REPORT Contents 1 Overview

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
XSEDE QUARTERLY REPORT Contents 1 Overview XSEDE eXtreme Science and Engineering Discovery Environment 2011 Q3: July 1, 2011, through September 30, 2011 XSEDE Senior Management Team John Towns (NCSA) PI and Project Director Jay Boisseau (TACC) Co-PI and Users Services Director Patricia Kovatch (UT-NICS) Co-PI and Operations Director Ralph Roskies (PSC) Co-PI and Advanced User Support-Projects Director Nancy Wilkins-Diehr (SDSC) Co-PI and Advanced User Support-Communities Director Scott Lathrop (Shodor) Education and Outreach Director Kathlyn Boudwin (ORNL/NICS) Manager of Project Management Janet Brown (PSC) Manager of Systems and Software Engineering Kurt Wallnau (SEI) Manager of Software Development and Integration TBD Chair of the User Advisory Committee Carol Song (PU) Chair of the XD Service Providers Forum Service Provider Principal Investigators Sean Ahern University of Tennessee/NICS Jay Boisseau Texas Advanced Computing Center (TACC) Geoffrey Fox Indiana University Patricia Kovatch University of Tennessee (UT-NICS) Michael Levine Pittsburgh Supercomputing Center (PSC) Honggao Liu Louisiana Optical Network Initiative/Louisiana State University (LONI/LSU) Rich Loft National Center for Atmospheric Research (NCAR) Richard Moore San Diego Supercomputer Center (SDSC) Carol Song Purdue University (PU) Craig Stewart Indiana University (IU) John Towns National Center for Supercomputing Applications (NCSA) Jeffery Vetter Georgia Tech i XSEDE QUARTERLY REPORT Contents 1 Overview ........................................................................................................................... 7 1.1 Introduction .................................................................................................................... 7 1.2 Project Context ............................................................................................................... 7 1.3 Project Highlights .......................................................................................................... 9 2 Science and Engineering Highlights ............................................................................. 11 2.1 Astrophysics: Cold Gas Flows and the First Quasars (Tiziana Di Matteo & Rupert Croft, Carnegie Mellon University) .......................................................................................... 11 2.2 Atmospheric Sciences: Whatever the Weather (Ming Xue, University of Oklahoma) 11 2.3 Atmospheric Sciences: Ice, Ice, Baby (Cecilia Bitz, University of Washington) ........ 12 2.4 Chemistry: Recoupled Pair Bonding and Its Impact on Molecular States, Structure, Energetics, and Reactivity (Thom Dunning, University of Illinois at Urbana-Champaign) ..... 13 2.5 Computational Chemistry: Mechanism of 150-cavity Formation in Influenza Neuraminidase (Rommie Amaro, University of California Irvine) .......................................... 14 2.6 Digital Humanities: Petascale Humanities: Supercomputing Global News Media (Kalev Leetaru, University of Illinois at Urbana-Champaign).................................................. 15 2.7 Genomics: Whole Genome Sequencing of the Little Skate, Leucoraja erinacea (James Vincent, University of Vermont, Northeast Cyberinfrastructure Consortium) ......................... 15 2.8 Geophysics: Role of Electron Physics in Development of Turbulent Magnetic Reconnection in Collisionless Plasmas (Homa Karimabadi, University of California San Diego) 16 2.9 Inorganic Chemistry: Structure of a γ-Modified Peptide Nucleic Acid Duplex (Catalina Achim, Carnegie Mellon University) ........................................................................................ 17 2.10 Molecular Biosciences: Why Carbon Nanotubes Spell Trouble for Cells (Robert Hurt, Brown University) ..................................................................................................................... 17 2.11 Physical Chemistry: Modeling of Structural and Electronic Properties of Metamaterials (Petr Kral, University of Illinois at Chicago) ............................................................................ 18 2.12 Stellar Astronomy and Astrophysics: From Star Formation To Supernovae: Astrochemistry Of Turbulent Gmc Models And Studies Of Type Ia Supernovae (Robert Fisher, University of Massachusetts Dartmouth ) ..................................................................... 19 2.13 Understanding biological macromolecules in situ (Prof. Borries Demeler, University of Texas Health Sciences Center, San Antonio (UTHSCSA) ....................................................... 19 3 XSEDE Project Office 1.1 .............................................................................................. 21 3.1 Overview ...................................................................................................................... 21 3.2 Project Management and Reporting 1.1.1 .................................................................... 21 3.3 Systems and Software Engineering 1.1.2 ..................................................................... 21 3.4 Architecture and Design 1.1.3 ...................................................................................... 22 ii 3.5 External Relations 1.1.4 ............................................................................................... 23 3.6 Industry Relations 1.1.5 ............................................................................................... 24 3.7 Software Development and Integration 1.1.6 .............................................................. 24 4 XSEDE Operations 1.2 ................................................................................................... 26 4.1 Overview ...................................................................................................................... 26 4.2 Security 1.2.1 ............................................................................................................... 27 4.3 Data Services 1.2.2....................................................................................................... 27 4.4 XSEDEnet 1.2.3 ........................................................................................................... 27 4.5 Software Testing and Deployment 1.2.4 ...................................................................... 28 4.6 Accounting and Account Management 1.2.5 ............................................................... 28 4.7 Systems Operational Support 1.2.6 .............................................................................. 29 5 User Services 1.3 ............................................................................................................. 31 5.1 Overview ...................................................................................................................... 31 5.2 Training 1.3.1 ............................................................................................................... 31 5.3 User Information & Interfaces 1.3.2 ............................................................................ 32 5.4 User Engagement 1.3.3 ................................................................................................ 32 5.5 Allocations 1.3.4 .......................................................................................................... 33 6 Extended Collaborative Support Service – Projects 1.4 ............................................. 35 6.1 Overview ...................................................................................................................... 35 6.2 Extended Research Teams Support 1.4.1 ..................................................................... 36 6.3 Novel and Innovative Projects 1.4.2 ............................................................................ 42 7 Extended Collaborative Support Service – Communities 1.5 .................................... 46 7.1 Overview ...................................................................................................................... 46 7.2 Extended Community Capabilities Support 1.5.1 ........................................................ 46 7.3 Extended Science Gateways Support 1.5.2 .................................................................. 47 7.4 Extended EOT Support 1.5.3 ....................................................................................... 48 8 Education and Outreach 1.6 .......................................................................................... 50 8.1 Overview ...................................................................................................................... 50 8.2 Education 1.6.1 ............................................................................................................ 50 8.3 Outreach 1.6.2 .............................................................................................................. 52 8.4 Community Input ......................................................................................................... 58 8.5 Infrastructure ................................................................................................................ 59 8.6 Campus Bridging ......................................................................................................... 59 9 TAIS/ Technology Audit Services 1.7 ........................................................................... 64 10 TAIS/Technology Insertion 1.8 ..................................................................................... 74 iii 10.1 Highlights ....................................................................................................................
Load more

Recommended publications
  • ABCD Just Released New Books October 2010 English
    ABCD springer.com Just Released New Books October 2010 English Titles Sorted by author and title within the main subject springer.com 2 P. Abrahamsson, University of Helsinki, Finland; N. Oza, VTT Tech- E. Abrams, Paris, France; I. Chvatík, Academy of Sciences, Praque, V. Acary, INRIA, Saint-Ismier, France; O. Bonnefon, INRIA, Saint- nical Research Centre of Finland, Espoo, Finland (Eds.) Czech Republic (Eds.) Ismier, France; B. Brogliato, INRIA, Saint-Ismier, France Lean Enterprise Software and Jan Pato#ka and the Heritage of Nonsmooth Modeling and Systems Phenomenology Simulation for Switched Circuits First International Conference, LESS 2010, Helsinki, finland, Centenary Papers October 17-20, 2010, Proceedings Nonsmooth Modeling and Simulation for Switched Circuits concerns the modeling and the numerical Whereas for the wider public Jan Patocka is known simulation of switched circuits with the nonsmooth This book contains the refereed proceedings of the mainly as a defender of human rights and one of dynamical systems (NSDS) approach, using piece- 1st International Conference on Lean Enterprise the first spokespersons of Charter 77, who died in wise-linear and multivalued models of electronic Software and Systems, LESS 2010, held in Helsinki, Prague several days after long interrogations by devices like diodes, transistors, switches. Numerous Finland, in October 2010. LESS 2010 is the first sci- secret police of the Communist regime, the inter- examples (ranging from introductory academic cir- entific conference dedicated to advance the body of national philosophical community sees in him an cuits to various types of power converters) are ana- knowledge for lean enterprise software and systems important and inspiring thinker, who in an origi- lyzed and many simulation results obtained with development.
    [Show full text]
  • Mapping Polycrystalline Materials in 3D: Diffraction Contrast Tomography and Related Techniques
    Mapping polycrystalline materials in 3D: Diffraction contrast tomography and related techniques Andrew King ! Synchrotron SOLEIL W. Ludwig, P. Reischig, L. Nervo, S. Schmiederer, N. Viganò, Y. Guilhem, G. Johnson and many others… Outline • Introduction • Motivation • Underlying techniques • Diffraction contrast tomography – Setup, data acquisition and processing • Application examples • Developments in progress • Related techniques 1 Myself • Diffraction for strain, stress and damage characterisation – Manchester 2001-2005 • Tomography for 3D morphology of porous and granular materials – INSA de Lyon 2006 • Diffraction Contrast Tomography for mapping polycrystals and materials applications. – Manchester/ESRF/HZG 2009-2013 • At SOLEIL since 2013… – PSICHE beamline, tomography for materials science Outline • Introduction • Motivation • Underlying techniques • Diffraction contrast tomography – Setup, data acquisition and processing • Application examples • Developments in progress • Related techniques 2 450 S. Terzi et al. / Scripta Materialia 61 (2009) 449–452 serted into alumina tubes and fixed with ceramic glue. In The liquid regions have been outlined in blue. At the on- order to localize the deformation of the specimen in the set of deformation, time t0, the liquid of near-eutectic region of interest where X-ray images are recorded, the composition is fairly homogeneously distributed within cross-section of the specimen was locally reduced to the whole specimen. The measured volume fraction of about 1.5 mm in diameter (i.e. a notched zone). The liquid, typically 7–8%, can be compared to the theoreti- specimen was heated by an induction coil and the tem- cal value predicted by two microsegregation models. At perature was controlled and monitored by using a ther- the temperature of 555 °C, the liquid fraction is equal to mocouple 0.5 mm in diameter inserted into the lower 9% under equilibrium conditions, whereas the Scheil– alumina tube and in close contact with the specimen.
    [Show full text]
  • NEWS Springer.Com
    AB2010 ABCD ABCD springer.com 233 Spring Street New York, NY 10013 Springer NEWS Apress AIP Press American Institute of Physics Birkhäuser New York Copernicus Heidelberg Current Medicine Dordrecht Friends of ED London Want this by e-mail? Humana Press Tokyo Subscribe now to the monthly Lavoisier-Intercept Library Books E-Newsletter: Boston 9 Physica Verlag Basel springer.com/librarybooks Springer-Praxis Get all the content of this catalog in PDF, Excel, and HTML. Berlin The Royal Society of Chemistry Hong Kong Springer Wien NewYork Milan SEPTEMBER Steinkopff Verlag New Delhi Vieweg 2010 Paris V7009 Springer News 9/2010 General Information ABCD springer.com Returns: Discount Key Returns must be in resaleable condition. Please include a copy of the original invoice P = Professional or packing slip along with your shipment. For your protection, we recommend all MC = Medicine/Clinical returns be sent via a traceable method. Damaged books must be reported within two MR = Medicine/Reference months of billing date. Springer reserves the right to reject any return that does not T = Trade follow the procedures detailed above. C = Computer Trade L = Landolt-Bornstein Handbook Returns in the Americas (excluding Canada): S = Special Software Springer c/o Mercedes/ABC Distribution Center Notice of Brooklyn Navy Yard; Bldg. 3 Sales and Service Brooklyn, NY 11205 Returns in Canada: Bookstore and Library Sales: Springer Matt Conmy, Vice President, Trade Sales c/o Georgetown Terminal Warehouse Price Changes tel: 800-777-4643 ext. 578 34 Armstrong Avenue e-mail: [email protected] Georgetown, Ontario L7G 4R9 Trade Marketing Support: Prices: Casey Spear, Product Manager Please note that all prices are in US $, and are subject to change without notice.
    [Show full text]
  • POSTER ABSTRACTS A# = Advanced Photon Source Abstracts C# = Center for Nanoscale Materials Abstracts ESRP# = Exemplary Student Research Program Abstracts
    2018 APS/CNM USERS MEETING APS/CNM 2018 USERS MEETING POSTER ABSTRACTS A# = Advanced Photon Source abstracts C# = Center for Nanoscale Materials abstracts ESRP# = Exemplary Student Research Program abstracts 79 Poster Abstracts 80 2018 APS/CNM USERS MEETING APS/CNM 2018 USERS MEETING APS POSTER ABSTRACTS 81 APS Poster Abstracts 82 2018 APS/CNM USERS MEETING estimate the magnitude of this effect. Further ultrafast XAS Chemistry studies on the Cd and Te edges and fs optical transient A1 absorption studies will provide a full picture of the charge Internal Atomic‑scale Structure, Band separated state in ZnTe/CdSe CSQDs. Alignment, and Charge Transfer Dynamics This material is based upon work supported by the Robert C. and of ZnTe/CdSe Core/Shell Quantum Dots Carolyn J. Springborn Endowment for Student Support Program and the National Science Foundation Graduate Research Fellowship 1 1 1 Cecilia Gentle , Tyler Haddock , Conner Dykstra , Program. Any opinions, findings, and conclusions or recommendations Ming-Feng Tu2, Andre al Haddad2,Gilles Doumy2, expressed in this material are those of the author(s) and do not Anne Marie March2, and Renske van der Veen1 necessarily reflect the views of the National Science Foundation. 1 Department of Chemistry, University of Illinois at Urbana‑Champaign, This research was carried out in part in the Frederick Seitz Materials Champaign, IL 61801 Research Laboratory Central Research Facilities, University of Illinois. Additionally, this research used resources of the Advanced Photon 2 Chemical Sciences and Engineering Division, Argonne National Source, a U.S. Department of Energy (DOE) Office of Science User Laboratory, Argonne, IL 60439 Facility operated for the DOE Office of Science by Argonne National Heterostructured nanomaterials (i.e., core/shell quantum Laboratory under Contract No.
    [Show full text]
  • Electronic Reprint Reconstruction of Local Orientation in Grains Using A
    electronic reprint Journal of Applied Crystallography ISSN 1600-5767 Reconstruction of local orientation in grains using a discrete representation of orientation space Nicola Vigano,` Wolfgang Ludwig and Kees Joost Batenburg J. Appl. Cryst. (2014). 47, 1826–1840 Copyright c International Union of Crystallography Author(s) of this paper may load this reprint on their own web site or institutional repository provided that this cover page is retained. Republication of this article or its storage in electronic databases other than as specified above is not permitted without prior permission in writing from the IUCr. For further information see http://journals.iucr.org/services/authorrights.html Many research topics in condensed matter research, materials science and the life sci- ences make use of crystallographic methods to study crystalline and non-crystalline mat- ter with neutrons, X-rays and electrons. Articles published in the Journal of Applied Crys- tallography focus on these methods and their use in identifying structural and diffusion- controlled phase transformations, structure-property relationships, structural changes of defects, interfaces and surfaces, etc. Developments of instrumentation and crystallo- graphic apparatus, theory and interpretation, numerical analysis and other related sub- jects are also covered. The journal is the primary place where crystallographic computer program information is published. Crystallography Journals Online is available from journals.iucr.org J. Appl. Cryst. (2014). 47, 1826–1840 Nicola Vigano` et al. · Reconstruction of local grain orientation research papers Journal of Applied Reconstruction of local orientation in grains using a Crystallography discrete representation of orientation space ISSN 1600-5767 Nicola Vigano`,a,b,c* Wolfgang Ludwiga,b and Kees Joost Batenburgd,c,e Received 9 May 2014 Accepted 7 September 2014 aMATEIS, INSA Lyon, France, bESRF Grenoble, France, ciMinds-Vision Lab, University of Antwerp, Belgium, dCWI, Amsterdam, The Netherlands, and eUniversiteit Leiden, The Netherlands.
    [Show full text]
  • Incipient Bulk Polycrystal Plasticity Observed by Synchrotron In-Situ Topotomography
    materials Article Incipient Bulk Polycrystal Plasticity Observed by Synchrotron In-Situ Topotomography Henry Proudhon 1,* , Nicolas Guéninchault 1,†, Samuel Forest 1 and Wolfgang Ludwig 2,3 1 MINES ParisTech, PSL Research University, MAT—Centre des Matériaux, CNRS UMR 7633, BP 87 91003 Evry, France; [email protected] (N.G.); [email protected] (S.F.) 2 ESRF, The European Synchrotron, CS 40220, 38043 Grenoble, France; [email protected] 3 INSA Lyon, MATEIS, University of Lyon, UMR 5510 CNRS, F-69621 Lyon, France * Correspondence: [email protected]; Tel.: +33-160-763-070 † Current address: Xnovo Technology ApS, Theilgaards Alle 9, 1th, 4600 Køge, Denmark. Received: 10 September 2018; Accepted: 10 October 2018; Published: 18 October 2018 Abstract: In this paper, we present a comprehensive 4D study of the early stage of plastic deformation in a polycrystalline binary AlLi alloy. The entire microstructure is mapped with X-ray diffraction contrast tomography, and a set of bulk grains is further studied via X-ray topotomography during mechanical loading. The observed contrast is analyzed with respect to the slip system activation, and the evolution of the orientation spread is measured as a function of applied strain. The experimental observations are augmented by the mechanical response predicted by crystal plasticity finite element simulations to analyze the onset of plasticity in detail. Simulation results show a general agreement of the individual slip system activation during loading and that comparison with experiments at the length scale of the grains may be used to fine tune the constitutive model parameters. Dataset: 10.5281/zenodo.1412401 Keywords: polycrystal plasticity; X-ray diffraction imaging; topotomography; in situ experiment; finite element simulation; lattice curvature; rocking curve 1.
    [Show full text]
  • Scanning 3DXRD Measurement of Grain Growth, Stress, and Formation of Cu6sn5 Around a Tin Whisker During Heat Treatment
    materials Article Scanning 3DXRD Measurement of Grain Growth, Stress, and Formation of Cu6Sn5 around a Tin Whisker during Heat Treatment Johan Hektor 1,* , Stephen A. Hall 1,*, N. Axel Henningsson 1, Jonas Engqvist 1, Matti Ristinmaa 1 , Filip Lenrick 2 and Jonathan P. Wright 3 1 Division of Solid Mechanics, Lund University, Box 118, 221 00 Lund, Sweden; [email protected] (N.A.H.); [email protected] (J.E.); [email protected] (M.R.) 2 Production and Materials Engineering, Lund University, Box 118, 221 00 Lund, Sweden; fi[email protected] 3 European Synchrotron Radiation Facility (ESRF), 71 Avenue des Martyrs, 38000 Grenoble, France; [email protected] * Correspondence: [email protected] (J.H.); [email protected] (S.A.H.) Received: 3 January 2019; Accepted: 29 January 2019; Published: 31 January 2019 Abstract: The 3D microstructure around a tin whisker, and its evolution during heat treatment were studied using scanning 3DXRD. The shape of each grain in the sample was reconstructed using a filtered-back-projection algorithm. The local lattice parameters and grain orientations could then be refined, using forward modelling of the diffraction data, with a spatial resolution of 250 nm. It was found that the tin coating had a texture where grains were oriented such that their c-axes were predominantly parallel to the sample surface. Grains with other orientations were consumed by grain growth during the heat treatment. Most of the grain boundaries were found to have misorientations larger than 15◦, and many coincidence site lattice (CSL) or other types of low-energy grain boundaries were identified.
    [Show full text]
  • Final Program
    The Mineral, Metals & Materials Society Presents: July 10–13, 2016 • Pheasant Run Resort • St. Charles, Illinois, USA FINAL PROGRAM Sponsored by: and the TMS Advanced Characterization, Testing & Simulation Committee The Minerals, Metals & Materials Society www.tms.org/3DMS2016 Unlocking crystallographic information in your lab ZEISS LabDCT // INNOVATION MADE BY ZEISS LabDCT Bringing synchrotron technology to the laboratory Directly visualize 3D crystallographic grain orientation in a non-destructive tomography environment with LabDCT for ZEISS Xradia 520 Versa 3D X-ray microscopes. Combine grain orientation information with microstructural features and open new possibilities for characterization of damage, deformation and growth mechanisms for 3D materials science. pages.zeiss.com/LabDCT Titanium alloy courtesy of Univ. Manchester. McDonald, Sci. Rep.,14665 (2015). Scan code to view direct visualization of a beta-Ti alloy with crystallographic information showing over reflections for 500 grains simultaneously. 2 The 3rd International Congress on 3D Materials Science 2016 WELCOME TO On behalf of The Minerals, Metals & Materials Society (TMS) and the congress organizers, I am pleased to welcome you to the third iteration of the International Congress on 3D Materials Science (3DMS 2016). This multi-disciplinary meeting distills the most current knowledge regarding 3D materials science into one conference, enabling you to fast forward your materials research impact. I hope you will take every opportunity during this week to immerse yourself in this unique, highly focused technical meeting where you have the chance to learn from and network with other 3D materials science experts. The 3DMS 2016 technical program will include plenary and invited lectures as well as oral and poster presentations including a wide range of topics areas, covering the most critical and rapidly growing areas of 3D materials science.
    [Show full text]
  • Powder Diffraction APD‐IV
    Accuracy in Powder Diffraction APD‐IV Accuracy In Powder Diffraction: Are We There Yet ? Robert von Dreele APS, Argonne National Laboratory, Lemont, Il 60439, USA [email protected] In the 12 years since the last Accuracy in Powder Diffraction meeting, there have been significant advances. Just an example: a search of the Protein Data Bank for “powder” shows just 2 hits for before 2000, 19 for 2000‐2005, 27 for 2005‐2010 and 31 for 2010‐present. The current Cambridge Crystallographic Data Base (CCDC) shows 2354 molecular crystal structures determined via powder diffraction (out of some 0.6M structures determined by single crystal methods!); most have been determined in the last 10 years Similarly, most synchrotron sources now have high resolution multi‐detector powder diffractometers either in operation or under construction; 10 years ago there was only one (at ESRF). Software developments have also kept pace with, for example, the addition of extensive restraints and rigid bodies in GSAS for support of protein refinements and the continued development of the fundamental parameters approach (FPA) in TOPAS. These developments come with a new set of questions about accuracy. For example, what is the impact of constraints/restraints on the results; should restraints be considered as “observations”? What instrumental deficiencies now appear with high resolution multi‐detector data? Are they accurately modeled in Rietveld refinements? Is our approach to validate powder diffraction results adequate? This talk will summarize these and other developments and their impact on the accuracy of powder diffraction results. Supported by US DOE/OS/BES under Contract No. DE-AC-02-06CH11357.
    [Show full text]
  • 3DXRD – a New Probe for Materials Science
    Downloaded from orbit.dtu.dk on: Oct 09, 2021 3DXRD – a new probe for materials science Poulsen, Henning Friis Publication date: 2004 Document Version Publisher's PDF, also known as Version of record Link back to DTU Orbit Citation (APA): Poulsen, H. F. (2004). 3DXRD – a new probe for materials science. Risø National Laboratory. General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Users may download and print one copy of any publication from the public portal for the purpose of private study or research. You may not further distribute the material or use it for any profit-making activity or commercial gain You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. 3DXRD – a new probe for materials science 3DXRD – a new probe for materials science by Henning Friis Poulsen Centre for Fundamental Research: Metal Structures in Four Dimensions, Materials Research Department, Risø National Laboratory, Roskilde, Denmark. Denne afhandling er af Danmarks Tekniske Universitet antaget til forsvar for den tekniske doktorgrad. Antagelsen er sket efter bedømmelse af den foreliggende afhandling. Kgs. Lyngby, den 5. februar 2004 Lars Pallesen Rektor /Kristian Stubkjær Forskningsdekan This dissertation has been accepted by the Technical University of Denmark for public defence in fulfilment of the requirements for the degree of Doctor Technices.
    [Show full text]
  • Can Intergranular Force Transmission Be Identified
    Can intergranular force transmission be identified in sand? First results of spatially-resolved neutron and x-ray diffraction Stephen Hall, Jonathan Wright, Edward Ando, Thilo Pirling, Darren Hughes, Gioacchino Viggiani To cite this version: Stephen Hall, Jonathan Wright, Edward Ando, Thilo Pirling, Darren Hughes, et al.. Can intergran- ular force transmission be identified in sand? First results of spatially-resolved neutron and x-ray diffraction. Granular Matter, Springer Verlag, 2011, 13 (3), pp.251-254. 10.1007/s10035-011-0251-x. hal-01571002 HAL Id: hal-01571002 https://hal.archives-ouvertes.fr/hal-01571002 Submitted on 1 Aug 2017 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Noname manuscript No. (will be inserted by the editor) Can intergranular force transmission be identified in sand? First results of spatially-resolved neutron and x-ray diffraction Stephen A. Hall · Jonathan Wright · Thilo Pirling · Edward And`o · Darren J. Hughes · Gioacchino Viggiani Received: date / Accepted: date Abstract This work tackles the challenge of assess- In recent years there has been much discussion of ment of force distributions in granular media. Spatially force-chains in granular media and their importance in resolved neutron and x-ray diffraction are used to mea- controlling the mechanics at the larger scale.
    [Show full text]
  • In Situ Elastic Strain Measurements-Diffraction and Spectroscopy R
    In situ Elastic Strain Measurements-Diffraction and Spectroscopy R. Spolenak, Wolfgang Ludwig, Jean-Yves Buffiere, J. Michler To cite this version: R. Spolenak, Wolfgang Ludwig, Jean-Yves Buffiere, J. Michler. In situ Elastic Strain Measurements- Diffraction and Spectroscopy. MRS Bulletin, Cambridge University Press (CUP), 2010, 35 (5), pp.368- 374. hal-00517710 HAL Id: hal-00517710 https://hal.archives-ouvertes.fr/hal-00517710 Submitted on 15 Sep 2010 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. MRS Bulletin Paper, Topic IV In-situ elastic strain measurements – diffraction and spectroscopy R. Spolenak, W. Ludwig, J. Y. Buffiere, J. Michler 1 Introduction X-ray diffraction is a common tool to determine order in materials. Based on Bragg’s equation, the average distance of nearest neighbors of atoms or molecules can be determined. In crystalline materials, a high degree of ordering results in very sharp diffraction peaks. The sharpness of this peaks allows for a highly accurate determination of atomic spacing and consequently of elastic strains (deviations from the equilibrium lattice spacing) and the calculation of stress tensors. In addition, any deviation of perfect periodicity, which exhibits itself in the broadening and asymmetry of diffraction peaks, renders information of the imperfections in materials, namely their microstructure.
    [Show full text]