Sample records for von mises stress

  1. Probability distribution of von Mises stress in the presence of pre-load.

    SciTech Connect (OSTI)

    Segalman, Daniel Joseph; Field, Richard V.; Reese, Garth M. [Sandia National Laboratories, Albuquerque, NM

    2013-04-01T23:59:59.000Z

    Random vibration under preload is important in multiple endeavors, including those involving launch and re-entry. There are some methods in the literature to begin to address this problem, but there is nothing that accommodates the existence of preloads and the necessity of making probabilistic statements about the stress levels likely to be encountered. An approach to achieve to this goal is presented along with several simple illustrations.

  2. German mathematicians in exile in Turkey: Richard von Mises, William Prager, Hilda Geiringer, and their impact

    E-Print Network [OSTI]

    Sertöz, Ali Sinan

    German mathematicians in exile in Turkey: Richard von Mises, William Prager, Hilda Geiringer of Mathematics, 80815 Bebek-Istanbul, Turkey b Sabanci University, Faculty of Arts and Social Sciences, Orta Mahalle, Ã?niversite Caddesi No.: 27 34956 Tuzla-Istanbul, Turkey Abstract There is a sizable and growing

  3. Modeling of stress distributions on the microstructural level in Alloy 600

    SciTech Connect (OSTI)

    Kozaczek, K.J. [Oak Ridge National Lab., TN (United States); Petrovic, B.G.; Ruud, C.O. [Pennsylvania State Univ., University Park, PA (United States); Mcllree, A.R. [Electric Power Research Inst., Palo Alto, CA (United States)

    1995-04-01T23:59:59.000Z

    Stress distribution in a random polycrystalline material (Alloy 600) was studied using a topologically correct microstructural model. Distributions of von Mises and hydrostatic stresses at the grain vertices, which could be important in intergranular stress corrosion cracking, were analyzed as functions of microstructure, grain orientations and loading conditions. Grain size, shape, and orientation had a more pronounced effect on stress distribution than loading conditions. At grain vertices the stress concentration factor was higher for hydrostatic stress (1.7) than for von Mises stress (1.5). The stress/strain distribution in the volume (grain interiors) is a normal distribution and does not depend on the location of the studied material volume i.e., surface vs/bulk. The analysis of stress distribution in the volume showed the von Mises stress concentration of 1.75 and stress concentration of 2.2 for the hydrostatic pressure. The observed stress concentration is high enough to cause localized plastic microdeformation, even when the polycrystalline aggregate is in the macroscopic elastic regime. Modeling of stresses and strains in polycrystalline materials can identify the microstructures (grain size distributions, texture) intrinsically susceptible to stress/strain concentrations and justify the correctness of applied stress state during the stress corrosion cracking tests. Also, it supplies the information necessary to formulate the local failure criteria and interpret of nondestructive stress measurements.

  4. PERGAMENTURKUNDEN VON MAINZER ERZBISCHFEN

    E-Print Network [OSTI]

    van Straten, Duco

    Erstenberger von Freyenthurm, Kammerrat und Keller des Amtes Nieder-Olm, seiner Witwe Anna Maria geb. Burckhard

  5. Von Mises-Fisher Clustering Models Siddharth Gopal SGOPAL1@CS.CMU.EDU

    E-Print Network [OSTI]

    Shamos, Michael I.

    Dirichlet allocation (Blei et al., 2003) have emerged as the defacto standard for discovering the latent., 2004) or Multinomial (Blei et al., 2003; 2004; Blei & Lafferty, 2006a;b) are not appropriate. On one

  6. Mathematical model of stress formation during vacuum resin infusion I.B. Sevostianov, V.E. Verijenko*, C.J. von Klemperer, B. Chevallereau1

    E-Print Network [OSTI]

    Sevostianov, Igor

    Mathematical model of stress formation during vacuum resin infusion process I.B. Sevostianov, V manufacturing technology based on vacuum infusion which is also known as resin film infusion technology to be infused by the vacuum to completely wet-out the reinforcements and eliminate air voids in the laminate

  7. GESTIFTET VON: Verliehen vom Regional-

    E-Print Network [OSTI]

    Kersting, Roland

    in bayern. Die Preise werden von der Linde aG gestiftet und bestehen jeweils aus einer urkunde und einem Kirchheim bei München sowie ein Vertreter von Linde an. nach der entscheidung des Preis- komitees werden die

  8. Stress Analysis and Structural Optimization of a Three-Layer Composite Cladding Tube Under Thermo-Mechanical Loads

    SciTech Connect (OSTI)

    S.-S. Zhou; X.-L. Gao; G. W. Griffith

    2012-07-01T23:59:59.000Z

    A general solution for the stress and strain fields in a three-layer composite tube subjected to internal and external pressures and temperature changes is first derived using thermo-elasticity. The material in each layer is treated as orthotropic, and the composite tube is regarded to be in a generalized plane strain state. A three-layer ZRY4-SiCf/SiCSiC composite cladding tube under a combined pressure and thermal loading is then analyzed and optimized by applying the general solution. The effects of temperature changes, applied pressures, and layer thickness on the mechanical behavior of the tube are quantitatively studied. The von Mises failure criterion for isotropic materials and the Tsai-Wu's failure theory for composites are used, respectively, to predict the failure behavior of the monolithic ZRY4 (i.e., Zircaloy-4) inner layer and SiC outer layer and the composite SiCf/SiC core layer of the three-layer tube. The numerical results reveal that the maximum radial and circumferential stresses in each layer always occur on the bonding surfaces. By adjusting the thickness of each layer, the effective stress in the three-layer cladding tube under the prescribed thermal-mechanical loading can be changed, thereby making it possible to optimally design the cladding tube.

  9. Hermann Witekinds Christlich bedencken und die Entstehung des Faustbuchs von 1587 Herausgegeben von Frank Baron In Verbindung mit einer kritischen Edition des Textes von 1585 von Benedikt Sommer

    E-Print Network [OSTI]

    Baron, Frank

    2009-01-01T23:59:59.000Z

    Herausgegeben von Frank Baron In Verbindung mit einer kritischen Edition des Textes von 1585 von Benedikt Sommer Series: Studium Literarum 17 Publisher: Weidler Buchverlag Year: 2009... ---------------------------------------------------------------------------------------------------------------------------------- Table of Contents: Frank Baron, Einleitung (Introduction) I. Benedikt Sommer, Christlich bedencken und erjnnerung von Zauberey, kritische Edition II. Untersuchungen (Essays) Benedikt Sommer, Das Leben und Werk Hermann Witekinds Otto Ulbricht...

  10. AT VON SUCHSTRATEGIEN AUF PLANAREN GRAPHEN

    E-Print Network [OSTI]

    Brandes, Ulrik

    DUALIT  AT VON SUCHSTRATEGIEN AUF PLANAREN GRAPHEN Diplomarbeit von Vanessa K a ab Fakult at f Graphentheorie 4 2.1 Graphen und Untergraphen . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 Wege Graphen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.6 Der Dualgraph

  11. mise jour: 30/03/2009 Rapport de ma mission au Pakistan

    E-Print Network [OSTI]

    Waldschmidt, Michel

    1 mise à jour: 30/03/2009 Rapport de ma mission au Pakistan École de recherche CIMPA du 22 au 28://www.lums.edu.pk/> pour y donner une conférence dans le cadre de French Science Tour in Pakistan Science Tour in Pakistan. · Samedi 28 février, 8 exposés organisés par Juergen Herzog permettant à des

  12. mise jour: 09/12/2009 Rapport de ma mission au Pakistan

    E-Print Network [OSTI]

    Waldschmidt, Michel

    1 mise à jour: 09/12/2009 Rapport de ma mission au Pakistan École de recherche CIMPA du 22 au 28://www.lums.edu.pk/> pour y donner une conférence dans le cadre de French Science Tour in Pakistan Science Tour in Pakistan. · Samedi 28 février, 8 exposés organisés par Juergen Herzog permettant à des

  13. LES PILES DOMESTIQUES Fiche I La quantit de piles mises en

    E-Print Network [OSTI]

    Skorobogatiy, Maksim

    1 LES PILES DOMESTIQUES Fiche I La quantité de piles mises en marché au Québec L'Association canadienne des piles domestiques (ACPD) estime qu'il s'est vendu environ 48 millions de piles1 au Québec tableau suivant montre une répartition sommaire de ces piles pour cette période : TYPE DE PILES MASSE

  14. MISE AU POINT LES MOBILITS DES IONS DANS LES HYDROCARBURES LIQUIDES

    E-Print Network [OSTI]

    Boyer, Edmond

    495. MISE AU POINT LES MOBILITÉS DES IONS DANS LES HYDROCARBURES LIQUIDES Par JACQUES MATHIEU, JEAN hydrocarbures liquides, on étudie la variation de cette mobilité en fonction de la viscosité du liquide et de la des- cription des méthodes de mesures des mobilités ioniques dans le cas des hydrocarbures liquides et

  15. TAT ACTUEL DE LA MISE AU POINT BIBLIOGRAPHIQUE SUR LE NIOBIUM ET SES ALLIAGES

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    597 ÉTAT ACTUEL DE LA MISE AU POINT BIBLIOGRAPHIQUE SUR LE NIOBIUM ET SES ALLIAGES par F. JEANNE, J une bibliographie auto-indexée sur le niobium et ses alliages. Abstract. 2014 The « Centre d'Information de Thermodynamique Chimique Minérale » presents a self indexed bibliography on niobium and its alloys

  16. Mise au concours du logo de l'ADEPSY Association des Etudiants en Psychologie

    E-Print Network [OSTI]

    Rochaix, Jean-David

    Mise au concours du logo de l'ADEPSY Association des Etudiants en Psychologie L'Association des, par le logo suivant : Cette année nous avons décidé de rafraîchir son image ! Nous lançons donc un sera retenue pour représenter l'association. Conditions : Le logo doit intuitivement pouvoir être

  17. alps monitoring von: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    340 Auswirkungen von traumatischen Kriegserlebnissen auf die psychische Gesundheit von Kosovo-Albanern im Kosovo. Open Access Theses and Dissertations Summary: ??Ziel dieser Studie...

  18. A two-dimensional finite element thermomechanical approach to a global stress-strain analysis of steel continuous casting

    E-Print Network [OSTI]

    Boyer, Edmond

    of steel continuous casting Michel Bellet, Alban Heinrich Ecole des Mines de Paris, Centre de Mise en Forme.bellet@ensmp.fr Synopsis This paper addresses the two-dimensional finite element simulation of steel continuous casting state (temperature, deformation, stresses) of steel all along the continuous casting machine. Both plane

  19. Das GARCH Modell zur Modellierung von Finanzmarktzeitreihen

    E-Print Network [OSTI]

    Alsmeyer, Gerold

    Das GARCH Modell zur Modellierung von Finanzmarktzeitreihen Seminararbeit von Frauke Heuermann Juni ARCH(1)-Prozess . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2 Der GARCH-Prozess 5 2.1 Der GARCH(1,1)-Prozess . . . . . . . . . . . . . . . . . . . . . . 5 2.2 Das vierte Moment und die W

  20. Von Ungarn nach Auschwitz: Die verschwiegene Warnung.

    E-Print Network [OSTI]

    Baron, Frank; Szenes, Sá ndor

    2010-10-19T23:59:59.000Z

    Works in “Von Ungarn nach Auschwitz: Die verschwiegene Warnung” at http://hdl.handle.net/1808/6817. An English translation of the Vrba-Wetzler report may be found at http://www.holocaustresearchproject.org/othercamps/auschproto.html See also: "The ‘Myth... s , Rilke, Hesse, Thomas Ma nn, Alber t Bloch und zur unga r i s c h e n Literatu rg esch ich te. Sándor Szenes und Frank Baron Von Ungarn nach Auschwitz Die verschwiegene Warnung...

  1. The Hartree-von Neumann limit of many body dynamics

    E-Print Network [OSTI]

    I. Anapolitanos; I. M. Sigal

    2009-04-29T23:59:59.000Z

    In the mean-field regime, we prove convergence (with explicit bounds) of the many-body von Neumann dynamics with bounded interactions to the Hartree-von Neumann dynamics.

  2. The Amalgamated Free Product of Hyperfinite von Neumann Algebras

    E-Print Network [OSTI]

    Redelmeier, Daniel

    2012-07-16T23:59:59.000Z

    We examine the amalgamated free product of hyperfinite von Neumann algebras. First we describe the amalgamated free product of hyperfinite von Neumann algebras over finite dimensional subalgebras. In this case the result is always the direct sum...

  3. als medium von: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Information Technology) Prof. Dr. Andreas Rausch (Software Systems Engineering Zachmann, Gabriel 7 Bachelorarbeit Integration von PDF-Formularen als Multidisciplinary...

  4. als homologem von: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Information Technology) Prof. Dr. Andreas Rausch (Software Systems Engineering Zachmann, Gabriel 7 Bachelorarbeit Integration von PDF-Formularen als Multidisciplinary...

  5. als folge von: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Information Technology) Prof. Dr. Andreas Rausch (Software Systems Engineering Zachmann, Gabriel 12 Bachelorarbeit Integration von PDF-Formularen als Multidisciplinary...

  6. akzeptanz von internet: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Sciences Websites Summary: Universitt Hamburg Fachbereich Informatik von Niels Hoffmann Tienrade 11 21031 Hamburg Matrikelnummer 4724342) Universitt Hamburg, Fachbereich...

  7. GOOD SCIENTIFIC PRACTICE at Carl von Ossietzky University Oldenburg

    E-Print Network [OSTI]

    Damm, Werner

    GOOD SCIENTIFIC PRACTICE at Carl von Ossietzky University Oldenburg K O M M I S S I O N F Ü R F O R OF RESEARCH EFFECTS #12;1 Guidelines for good scientific practice at Carl von Ossietzky University (30. Guidelines, 1. Allgemeine Prinzipien wissenschaftlicher Arbeit. Good scientific practice at Carl von

  8. Einsatz von Web Services im Semantic Web

    E-Print Network [OSTI]

    Moeller, Ralf

    Einsatz von Web Services im Semantic Web am Beispiel der RACER Engine und OWL-QL Jan Galinski Aufbau der Arbeit . . . . . . . . . . . . . . . . . . . . . 2 2 Grundlagen 5 2.1 Semantic Web . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2.1.1 Komponenten des Semantic Web . . . . . . . . . . . . . . . . . . . . 6 2.1.2 Repräsentation

  9. Von Economo Neurons in the Elephant Brain

    E-Print Network [OSTI]

    Allman, John M.

    , Washington, District of Columbia 3 Cleveland Metroparks Zoo, 3900 Wildlife Way, Cleveland, Ohio 4 Department of Neuroscience, Mount Sinai School of Medicine, New York, New York 5 Department of Experimental Veterinary Sciences, University of Padua, Padua, Italy ABSTRACT Von Economo neurons (VENs), previously found in humans

  10. Normalizers of Finite von Neumann Algebras

    E-Print Network [OSTI]

    Cameron, Jan Michael

    2010-10-12T23:59:59.000Z

    \\subseteq M is an inclusion of separable II_1 factors. We show that N_M(B) imposes a certain "discrete" structure on the generated von Neumann algebra. By analyzing the bimodule structure of certain subalgebras of N_M(B)'', this leads to a "Galois...

  11. Erstnachweis von Maro lehtineni Saaristo, 1971 fr die Schweiz (Arachnida, Araneae)

    E-Print Network [OSTI]

    Richner, Heinz

    den Männchen von Thaler (1983) subtile Unterschiede zur Beschreibung der Art in Saa- risto (1971 einer Höhe von 1960 m NN wurden auf einer Fläche von ca. 100 mal 250 m verschiedene Fangmethoden

  12. Fachgebiet Konstruktion von Maschinensystemen Prof. Dr.Ing. Henning J. Meyer

    E-Print Network [OSTI]

    Fachgebiet Konstruktion von Maschinensystemen Prof. Dr.Ing. Henning J. Meyer www.Ing. Henning Meyer Dipl.Ing. Christian Rusch Technische Universität Berlin Konstruktion von Maschinensystemen #12;Fachgebiet Konstruktion von Maschinensystemen Prof. Dr.Ing. Henning J. Meyer www

  13. berfachliche Grundlagen -Carl-von-Linde Akademie: Stand 16.10.2014 / Support Electives -Carl-von-Linde Academy: 16.10.2014 Titel Untertitel SWS ECTS Form.Form

    E-Print Network [OSTI]

    Cengarle, María Victoria

    Überfachliche Grundlagen - Carl-von-Linde Akademie: Stand 16.10.2014 / Support Electives - Carl-von-Linde

  14. Organisationsberatung Supervision Coaching, Heft 3/2003, S. 245-254 Evaluation von

    E-Print Network [OSTI]

    Kaus, Boris

    Eine Befragung von Coachs und Klienten zur Wirksamkeit von Coaching Anne Jansen, Eveline Mäthner weitestgehend äquivalent aufgebaut. Tabelle 1 zeigt die Themenblöcke des Fragebogens. #12;Anne Jansen, Eveline

  15. Universitat Konstanz Zeichnen von Graphen Fachbereich Informatik & Informationswissenschaft SS 2004

    E-Print Network [OSTI]

    Brandes, Ulrik

    Universit¨at Konstanz Zeichnen von Graphen Fachbereich Informatik & Informationswissenschaft SS Graphen berechnet. Aufgabe 3: 6 Punkte Eine transitive Reduktion von G ist ein Graph H mit der kleinsten Graphen immer eindeutig? (b) Ist ein minimales ¨Aquivalent eines gerichteten Graphen immer eine transitive

  16. A dynamical approach to Von Neumann Antoine Gournay

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    to a -invariant linear subspaces Y of p(;V) a real positive number dimpY (which is the von Neumann dimension when introduce a quantity dimp which, when p = 2, coincides with definition of von Neumann dimension properties of dimp , important properties are still lacking. Nevertheless, the results obtained in this paper

  17. ON CO-AMENABILITY FOR GROUPS AND VON NEUMANN ALGEBRAS

    E-Print Network [OSTI]

    Monod, Nicolas

    ON CO-AMENABILITY FOR GROUPS AND VON NEUMANN ALGEBRAS NICOLAS MONOD & SORIN POPA Abstract. We first show that co-amenability does not pass to subgroups, answering a question asked by Eymard in 1972. We then address co-amenability for von Neumann algebras, describing notably how it relates to the former. R

  18. Le cyclone : un nouveau racteur chimique solaire gaz-solide Application la mise en oeuvre en continu de la pyrolyse flash de sciure de bois

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    separators, can be also used as gas-solid chemical reactors. Preli- minary experiments made on a cyclone535 Le cyclone : un nouveau réacteur chimique solaire gaz-solide Application à la mise en oeuvre en, révisé le 17 décembre 1979, accepté le 18 décembre 1979) Résumé. 2014 Le cyclone, bien connu comme

  19. MISE EN EVIDENCE D'INE ACCUMULATION DE NEUROFILAMENTS DANS UNE POPULATION NEURONALE DU GANGLION SPIRAL CHEZ LE RAT AU COURS DE L'ONTOGENESE.

    E-Print Network [OSTI]

    Boyer, Edmond

    MISE EN EVIDENCE D'INE ACCUMULATION DE NEUROFILAMENTS DANS UNE POPULATION NEURONALE DU GANGLION population neuronale présente une accumulation de neurofilaments accumulation de sous-unités., alors qu'en microscopie électronique ces cellules ne sont reconnaissabtes que par

  20. C.F.von Weizsäcker-High Energy Physics

    ScienceCinema (OSTI)

    None

    2011-04-25T23:59:59.000Z

    C.F.von Weizsäcker (1912-2007),physicien,philosophe et "chercheur de paix", prit la décision de faire des études de physique sous l'influence de W.Heisenberg qu'il rencontra en 1927.

  1. ,,START-UP BRACHFLCHE" Arbeitshilfe zur Erarbeitung von Projektplnen

    E-Print Network [OSTI]

    Cirpka, Olaf Arie

    ,,START-UP BRACHFLÄCHE" Arbeitshilfe zur Erarbeitung von Projektplänen #12;#12;,,START-UP Preuß Volker Schrenk Kai Steffens Karolin Weber Stuttgart, April 2005 #12;START-UP-BRACHFLÄCHE Impressum;START-UP-BRACHFLÄCHE 3 Inhalt Abbildungsverzeichnis

  2. In-situ measurement of ground impedances Von der Fakultt fr Mathematik und Naturwissenschaften der Carl von Ossietzky

    E-Print Network [OSTI]

    Vormann, Matthias

    In-situ measurement of ground impedances Von der Fakultät für Mathematik und Naturwissenschaften .............................................................................................22 Summary: In-situ impedance measurement.Definitions..........................................................................................................................11 VI.Surface impedance measurement methods

  3. TECHNISCHE UNIVERSITT Htte die Katastrophe von Fukushima durch Roboter verhindert werden knnen? Forscher behaupten ja und haben zu einem

    E-Print Network [OSTI]

    Stryk, Oskar von

    TECHNISCHE UNIVERSITÄT Hätte die Katastrophe von Fukushima durch Roboter verhindert werden können Roboter die Atom-Katastrophe von Fukushima hätten verhindern können ­ wenn es denn welche gegeben hätte

  4. A comparison of current work-hardening models used in the analysis of plastic deformations

    E-Print Network [OSTI]

    Vaughn, David Kenneth

    1973-01-01T23:59:59.000Z

    on reyielding for reversed loading 2 The von Mises initial yield surface 3 Various definitions of yielding 4 Tensile loading, unloading and reloading. 5 Isotropic hardening 6 Linearized tensile stress-strain curve. 7 The uniaxial plastic stress... stress-strain curve, 6061-T6 aluminum. 91 15 Uniaxial reversed loading of 6061-T6 aluminum, isotropic hardening 92 16 Uniaxial reversed loading of 6061-T6 aluminum, kinematic hardening 93 17 Uniaxial reversed loading of 6061-T6 aluminum, mechanical...

  5. A comparison of current work-hardening models used in the analysis of plastic deformations 

    E-Print Network [OSTI]

    Vaughn, David Kenneth

    1973-01-01T23:59:59.000Z

    on reyielding for reversed loading 2 The von Mises initial yield surface 3 Various definitions of yielding 4 Tensile loading, unloading and reloading. 5 Isotropic hardening 6 Linearized tensile stress-strain curve. 7 The uniaxial plastic stress... stress-strain curve, 6061-T6 aluminum. 91 15 Uniaxial reversed loading of 6061-T6 aluminum, isotropic hardening 92 16 Uniaxial reversed loading of 6061-T6 aluminum, kinematic hardening 93 17 Uniaxial reversed loading of 6061-T6 aluminum, mechanical...

  6. Einzigartige energiesparende Lsungen mit einem Stromverbrauch von 0,0 Watt im Standby und

    E-Print Network [OSTI]

    Ott, Albrecht

    -Arabien SASO Global TCO'06, TCO'03, IT-Eco-Declaration, , , RoHS, WEEE Einhaltung von Richtlinien, Lin

  7. Einbettung von GitterAlgorithmen in de BruijnGraphen \\Lambda Michael N olle, Gerald Schreiber

    E-Print Network [OSTI]

    Einbettung von Gitter­Algorithmen in de Bruijn­Graphen \\Lambda Michael N¨ olle, Gerald Schreiber TU. Schreiber, Einbettung von Gitter­Algorithmen in de Bruijn­Graphen, Mitteilungen ­ Gesellschaft f¨ ur In diesem Artikel werden Einbettungen von Gitter­Graphen in de Bruijn­Graphen unter­ sucht. Insbesondere

  8. The Benard-Von Karman instability : an experimental study near the threshold

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    alternately to form a double row of oppositely signed vortices : the Benard-Von Karman vortex street. PreviousL-483 The Benard-Von Karman instability : an experimental study near the threshold C. Mathis, M features ofthe flow have been known since the work of Benard [3] or Von Karman [4]. For Re 4 the flow

  9. von Neumann algebras and Free Probability RMS meeting, ISI Bengaluru, May 13 2009

    E-Print Network [OSTI]

    Sunder, V S

    von Neumann algebras and Free Probability RMS meeting, ISI Bengaluru, May 13 2009 V.S. Sunder von Neumann algebras and Free Probability RMS meeting, ISI Bengaluru, M #12;Groups and algebras Groups: V.S. Sunder IMSc, Chennai von Neumann algebras and Free Probability RMS meeting, ISI Bengaluru, M

  10. Marshall's and Milnor's Conjectures for Preordered von Neumann Regular Rings

    E-Print Network [OSTI]

    Marshall's and Milnor's Conjectures for Preordered von Neumann Regular Rings M. Dickmann F a proper preorder T, satisfies Marshall's signature conjecture and Milnor's Witt ring conjecture (for result can be summarized as follows: 1) Marshall's signature conjecture was proved in [DM1

  11. Universitat Konstanz Zeichnen von Graphen Fachbereich Informatik & Informationswissenschaft SS 2004

    E-Print Network [OSTI]

    Brandes, Ulrik

    Universit¨at Konstanz Zeichnen von Graphen Fachbereich Informatik & Informationswissenschaft SS Sie: F¨ur den nebenstehenden planar ein- gebetteten Graphen G k¨onnen die Winkel so festgelegt werden erlaubt, es aber keine planare Zeichnung des gesamten Graphen G mit den gegebenen Winkeln gibt. [bitte

  12. Ab Frhjahr 2009 startet hier der Bau von sechs Offshore-

    E-Print Network [OSTI]

    Vollmer, Heribert

    Ent- wicklung der Offshore-Wind- energie besondere Bedeutung zu. Derzeit laufen in der AusAb Frühjahr 2009 startet hier der Bau von sechs Offshore- Windenergieanlagen (OWEA) vom Typ Wind- parks sind etwa die Erweite- rung des Pilotprojektes alpha ventus, der Park Borkum West (45

  13. Carl von Ossietzky Universitt Oldenburg Fachbereich Physik, 26111 Oldenburg

    E-Print Network [OSTI]

    Oldenburg, Carl von Ossietzky Universität

    Explosionen massereicher Sterne E. Hilf ISN 27.5.2002 Prof. Dr. Klaus Hasselmann Max-Planck-Institut für Anwendungen in der Medizin Klaus Hinsch AOP 24.6.2002 PD Dr.. Heinz-Peter Breuer Universität Freiburg, zur Funktion der Größe G. Bauer, R. Brüggemann GRECO Ort: Carl von Ossietzky Universität Oldenburg; Zeit

  14. John von Neumann Institute for Computing Monte Carlo Protein Folding

    E-Print Network [OSTI]

    Hsu, Hsiao-Ping

    John von Neumann Institute for Computing Monte Carlo Protein Folding: Simulations of Met://www.fz-juelich.de/nic-series/volume20 #12;#12;Monte Carlo Protein Folding: Simulations of Met-Enkephalin with Solvent-Accessible Area difficulties in applying Monte Carlo methods to protein folding. The solvent-accessible area method, a popular

  15. Spacetime Defects: von Kármán vortex street like configurations

    E-Print Network [OSTI]

    Patricio S. Letelier

    2001-07-05T23:59:59.000Z

    A special arrangement of spinning strings with dislocations similar to a von K\\'arm\\'an vortex street is studied. We numerically solve the geodesic equations for the special case of a test particle moving along twoinfinite rows of pure dislocations and also discuss the case of pure spinning defects.

  16. Introduction to foundations of probability and randomness (for students in physics), Lectures given at the Institute of Quantum Optics and Quantum Information, Austrian Academy of Science, Lecture-1: Kolmogorov and von Mises

    E-Print Network [OSTI]

    Andrei Khrennikov

    2014-10-19T23:59:59.000Z

    The education system for students in physics suffers (worldwide) from the absence of a deep course in probability and randomness. This is the real problem for students interested in quantum information theory, quantum optics, and quantum foundations. Here the primitive treatment of probability and randomness may lead to deep misunderstandings of theory and wrong interpretations of experimental results. Since during my visits (in 2013 and 2014) to IQOQI a number of students (experimenters!) asked me permanently about foundational problems of probability and randomness, especially inter-relation between classical and quantum structures, this year I gave two lectures on these problems. Surprisingly the interest of experiment-oriented students to mathematical peculiarities was very high. This (as well as permanent reminding of prof. Zeilinger) motivated me to write a text based on these lectures which were originally presented in the traditional black-board form. I hope that this might be useful for students from IQOQI as well as other young physicists.

  17. Beschiessung v. Reims durch die Armee des Generaloberst von Einem

    E-Print Network [OSTI]

    Burger, J. [illustrator

    2012-03-05T23:59:59.000Z

    noch ... kein Paketchen von mir erhalten. Schade! Sonst nichts weiter von Bedeutung. Hat Mutter mein schwarz weisses Kleid noch nicht fortgeschickt? Mir gehts noch gut, Euch hoffentlich auch? Herzl. Gruss Eure Gertrud. In Eile!; SENT TO: [An] Herrn [A...TRANSLATION; MESSAGE: My dears, just letting you know that I got a post card from Fritz today. Written on the 8th of this month, postmarked on the 10th. So not long in coming. He's still doing well. Still didn't get any package from me. Too bad! Otherwise nothing of importance. Did mother send my black and white dress yet? I'm okay, and you too I hope? Sincere greetings from your Gertrud Written in a hurry!; SENT TO: To Mr. [A.?] Hornseck, Dortmund, Kö rnebackstr. 1, (care of Aug. Klö nne Company). Dolberg, 14 April 1916....

  18. besondere Verdienste um die Frderung von Technik und

    E-Print Network [OSTI]

    Vollmer, Heribert

    der E.ON Future Award in der Leibniz Universität Hannover verlie- hen. Die E.ON Energie AG hat diesen können sich für den E.ON Future Award, der von E.ON auch an der TU München ver- liehen wird, alle Me- dien die besten ausgewählt: · Den mit jeweils 5.000 Euro dotierten E.ON Future Award für eine

  19. auto-validating von neumann: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    quantum processors with more traditional approach. Alexander Yu. Vlasov 2003-11-27 5 Fractal von Neumann entropy Mathematical Physics (arXiv) Summary: We consider the it...

  20. GESTIFTET VON: Der regionalverband bayern e.V. in der Deutschen Physikalischen

    E-Print Network [OSTI]

    Kersting, Roland

    . The Linde Group ist ein weltweit führendes Gase und engineering unternehmen, das mit rund 50 unternehmensgründer, Carl von Linde (1842­1934), war Professor für theoretische Maschinenlehre an der heutigen seiner ersten Kälteanlage 1873 in die Praxis umsetzte. Carl von Linde gelang es, wichtige Grundlagen für

  1. Nonexistence of Lyapunov Functions and the Instability of the von Karman Vortex Streets

    E-Print Network [OSTI]

    Lim, Chjan C.

    Nonexistence of Lyapunov Functions and the Instability of the von Karman Vortex Streets Chjan Lim of the von Karman vortex streets and the existence of a global Lyapunov function at the special aspect ratio the equilibrium Karman streets are unlikely theoretical candidates for observed vortex trails. On the other hand

  2. Moyal's Characteristic Function, the Density Matrix and von Neumann's Idempotent

    E-Print Network [OSTI]

    Basil J. Hiley

    2014-08-25T23:59:59.000Z

    In the Wigner-Moyal approach to quantum mechanics, we show that Moyal's starting point, the characteristic function $M(\\tau,\\theta)=\\int \\psi^{*}(x)e^{i(\\tau {\\hat p}+\\theta{\\hat x})}\\psi(x)dx$, is essentially the primitive idempotent used by von Neumann in his classic paper "Die Eindeutigkeit der Schr\\"odingerschen Operatoren". This paper provides the original proof of the Stone-von Neumann equation. Thus the mathematical structure Moyal develops is simply a re-expression of what is at the heart of quantum mechanics and reproduces exactly the results of the quantum formalism. The "distribution function" $F(X,P,t)$ is simply the quantum mechanical density matrix expressed in an $( X,P)$-representation, where $X$ and $P$ are the mean co-ordinates of a cell structure in phase space. The whole approach therefore clearly has little to do with classical statistical theories but is a consequence of a non-commutative nature of the theory.

  3. 1-D closure models for slender 3-D viscoelastic free jets: von Karman flow geometry and elliptical cross section

    SciTech Connect (OSTI)

    Bechtel, S.E.; Forest, M.G.; Holm, D.D.; Lin, K.J.

    1988-01-01T23:59:59.000Z

    In this paper we derive one space dimensional, reduced systems of equations (1-D closure models) for viscoelastic free jets. We begin with the three-dimensional system of conservation laws and a Maxwell-Jeffreys constitutive law for an incompressible viscoelastic fluid. First, we exhibit exact truncations to a finite, closed system of 1-D equations based on classical velocity assumptions of von Karman. Next, we demonstrate that the 3-D free surface boundary conditions overconstrain these truncated systems, so that only a very limited class of solutions exist. We then proceed to derive approximate 1-D closure theories through a slender jet asymptotic scaling, combined with appropriate definitions of velocity, pressure and stress unknowns. Our nonaxisymmetric 1-D slender jet models incorporate the physical effects of inertia, viscoelasticity (viscosity, relaxation and retardation), gravity, surface tension, and properties of the ambient fluid, and include shear stresses and time dependence. Previous special 1-D slender jet models correspond to the lowest order equations in the present asymptotic theory by an a posteriori suppression to leading order of some of these effects, and a reduction to axisymmetry. Solutions of the lowest order system of equations in this asymptotic analysis are presented: For the special cases of elliptical inviscid and Newtonian free jets, subject to the effects of surface tension and gravity, our model predicts oscillation of the major axis of the free surface elliptical cross section between perpendicular directions with distance down the jet, and drawdown of the cross section, in agreement with observed behavior. 15 refs.

  4. Prenatal maternal stress programs infant stress regulation.

    E-Print Network [OSTI]

    Davis, Elysia Poggi; Glynn, Laura M; Waffarn, Feizal; Sandman, Curt A

    2011-01-01T23:59:59.000Z

    Programs Infant Stress Regulation Elysia Poggi Davis, PhDglucocorticoids disrupts the regulation of physiological andstress alters circadian regulation and laboratory levels of

  5. The Amalgamated Free Product of Hyperfinite von Neumann Algebras 

    E-Print Network [OSTI]

    Redelmeier, Daniel

    2012-07-16T23:59:59.000Z

    unital subalgebra D. Subalgebras A1 and A2, both containing D, are said to be free with amalgamation over D if for any ai 2 A001 [A 00 2 , so that if ai 2 Ak then ai+1 =2 Ak, then EAD(a1a2 : : : an) = 0. The amalgamated free product of two nite von.... Finally we check that the algebras are free with amalgamation over D. Take, a1; : : : ; an, with ak 2 A00ik and ik 6= ik+1 for any k. Then when calculating i1(a1) i2(a2) : : : in(an) , we rst apply the second rule in the de nition of the left regular...

  6. Der letzte Ritt. Reise-Erinnerungen aus dem Trkenreiche von Karl May.1

    E-Print Network [OSTI]

    Prodinger, Helmut

    Marmorarten zusammengesetzt sind und von 250 Fenstern erleuchtet werden. Zur Zeit des Ramasans brennen hier Arbeitsstube des Hausherrn. Wir Andern wurden nach einem Raume geführt, welcher die Größe eines kleinen Saa

  7. EINBLICKE Nr. 50 / HERBST 2009 -CARL VON OSSIETZKY UNIVERSITT OLDENBURG HABERMAS: PARTEILICHKEIT FR VERNUNFT

    E-Print Network [OSTI]

    Oldenburg, Carl von Ossietzky Universität

    phantasiert wird, ob der zehnjährige Habermas als Mitglied der Hitler- Jugend sich von den Nazi as a member of the Hitler Youth. Accusations of this kind are palpable evidence of the price leftist German

  8. From Alexander von Humboldt to Charles Darwin: Evolution in Observation and Interpretation

    E-Print Network [OSTI]

    Baron, Frank

    2010-02-01T23:59:59.000Z

    “From Alexander von Humboldt to Charles Darwin: Evolution in Observation and Interpretation.” Internet Zeitschrift für Kulturwissensdhaften, 17. Nr. February 2010. http://www.inst.at/trans/17Nr/7-8/7-8_baron17.htm. Publisher’s official version... citation: “From Alexander von Humboldt to Charles Darwin: Evolution in Observation and Interpretation.” Internet Zeitschrift für Kulturwissensdhaften, 17. Nr. February 2010. http://www.inst.at/trans/17Nr/7-8/7- 8_baron17.htm Text of paper: From...

  9. Ikarus: Large-Scale Participatory Sensing at High Altitudes Michael von Kaenel, Philipp Sommer, and Roger Wattenhofer

    E-Print Network [OSTI]

    Ikarus: Large-Scale Participatory Sensing at High Altitudes Michael von Kaenel, Philipp Sommer, and Roger Wattenhofer Computer Engineering and Networks Laboratory ETH Zurich, Switzerland {vkaenemi,sommer

  10. 216 J. Opt. Soc. Am. B/Vol. 13, No. 1/January 1996 D. von der Linde and H. Schuler Breakdown threshold and plasma formation

    E-Print Network [OSTI]

    von der Linde, D.

    216 J. Opt. Soc. Am. B/Vol. 13, No. 1/January 1996 D. von der Linde and H. Sch¨uler Breakdown threshold and plasma formation in femtosecond laser­solid interaction D. von der Linde and H. Sch

  11. TU Berlin, Fak. IV, Institut fr Energie-und Automatisierungstechnik Seite 1 von 16 Elektrische Energiesysteme / Grundlagen der Elektrotechnik 3

    E-Print Network [OSTI]

    Wichmann, Felix

    .07.2011 Klausur Elektrische Energiesysteme / Grundlagen der Elektrotechnik 3 25.07.2011 Die Klausur besteht aus 4 das unten stehende Netz kann durch eine Y-Ersatzschaltung mit Spannungsquellen von ULN = 400 V, fN = 50 Hz mit einer jeweiligen Innenimpedanz von ZL = (0,1+j0,3) beschrieben werden. An das Netz soll

  12. Revisiting Alexander von Humboldt's Initiation of Rock Coating Research Author(s): Ronald I. Dorn, David H. Krinsley, Jeffrey Ditto

    E-Print Network [OSTI]

    Dorn, Ron

    Revisiting Alexander von Humboldt's Initiation of Rock Coating Research Author(s): Ronald I. Dorn, David H. Krinsley, Jeffrey Ditto Reviewed work(s): Source: The Journal of Geology, Vol. 120, No. 1 Revisiting Alexander von Humboldt's Initiation of Rock Coating Research Ronald I. Dorn,1, * David H. Krinsley

  13. Information Im Rahmen der Konzernnormung von BMW ist ab 01.04.2013 ein Praktikum fr die Dauer

    E-Print Network [OSTI]

    Wichmann, Felix

    Information Im Rahmen der Konzernnormung von BMW ist ab 01.04.2013 ein Praktikum für die Dauer von Standort: BMW Forschungs- und Innovationszentrum, München, Knorrstr. 147 Vollzeit: 35 h/ Woche Abt./Absender TI-509/ Arnd Früngel Telefon +49-89-382-18375 Fax E-Mail arnd.fruengel@bmw.de Kopie an Datum 15

  14. Give Stress a Rest

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    It's an instinctive response that helps us protect ourselves by placing the body and mind on "alert." Causes of stress can be as simple as a loud noise or as complicated as...

  15. Schwerpunkt: Analyse von Algorithmen T atigkeitsbericht f ur das Jahr 2001

    E-Print Network [OSTI]

    Drmota, Michael

    Schwerpunkt: Analyse von Algorithmen T atigkeitsbericht f ur das Jahr 2001 1 Mitarbeiter 1. Bernhard Gittenberger (Inst. f. Geometrie, bis 30.9.2001 Zivildienst) 4. Thomas Klausner (FWF-Projekt S Forschungsschwerpunkts geschrieben wurden, siehe den Tatigkeitsbericht 2000. Im zweiten Jahr (2001) sind die folgenden

  16. A Fractal Comparison of M.C. Escher's and H. von Koch's Tessellations

    E-Print Network [OSTI]

    Colorado at Boulder, University of

    A Fractal Comparison of M.C. Escher's and H. von Koch's Tessellations B. Van Dusen1 , B.C. Scannell determined by hyperbolic geometry, his work is often mistakenly described as following fractal geometry. Here, we perform a `box-counting' scaling analysis on Circle Limit III and an equivalent mono- fractal

  17. Turbulence modeling of the Von Karman flow: viscous and inertial stirrings

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    and significant novelty of this paper is the use of a drag force in the momentum equations to reproduce by a cylinder, known as the Von K´arm´an [3] geometry, is of practical importance in many industrial devices turbulence and especially of magneto-hydrodynamic turbulence. From an academic point of view, the laminar

  18. Seite 1 von 2 Virtual Trained-in-GermanY China

    E-Print Network [OSTI]

    Hellebrand, Sybille

    Seite 1 von 2 Einladung Virtual Trained-in-GermanY China 17.04.2014, 10h00 - 18h00 CST www.trained-in-germany Virtual Trained in GermanY in Brasilien, Indien und Südafrika findet die nächste virtuelle Jobmesse für Deutschland-Alumni in China statt: www.trained-in-germany.com/china. Die Trained in German

  19. famelab-germany.de FameLab Germany wird prsentiert von

    E-Print Network [OSTI]

    Hamburg,.Universität

    famelab-germany.de FameLab Germany wird präsentiert von Du ... studierst oder arbeitest in den Wissenschaftskommunikation #12;Anmeldung & Videos famelab-germany.de Let's taLK science! FameLab-Vorentscheid 22. März Medien- und Kommuni- kationstraining 5. + 6. April Berlin Finale FameLab Germany: 10. Mai Bielefeld

  20. Energiemethoden der Mechanik / Prof. Popov / Vorlesung 10. Das Verfahren von Castigliano. Lit: Ostermeyer 25.3

    E-Print Network [OSTI]

    Berlin,Technische Universität

    Feder, an der mit der Kraft F gezogen wird. Es gilt: F cx= , F x c = , 21 2 U cx= 2 2 F U c = . Daraus gleich. Beispiel: Für eine Feder ist 2 2 2 2 2 2 2 cx cx F U xF U cx U c = - = - = = = . Der 2. Satz von

  1. Teaching integration with layers and representations: A case study Joshua Von Korff and N. Sanjay Rebello

    E-Print Network [OSTI]

    Zollman, Dean

    Teaching integration with layers and representations: A case study Joshua Von Korff and N. Sanjay to facilitate learning of integration in a physics context. We implemented this sequence with a single college characterizes integration in terms of layers and representations. We describe how Amber learned to give oral

  2. Physical mechanisms of short pulse laser ablation D. von der Linde and K. Sokolowski-Tinten

    E-Print Network [OSTI]

    von der Linde, D.

    Physical mechanisms of short pulse laser ablation D. von der Linde and K. Sokolowski precision can be obtained with the use of very short laser pulses1 . However, a convincing explanation mechanisms of short pulse laser ablation should be of great current interest, both from the point of view

  3. PD Dr. Martin Stetter, Siemens AG 1 Lernen von Datenmodellen: Fehlerminimierung und Regularisierung

    E-Print Network [OSTI]

    Popeea, Corneliu - Chair for Foundations of Software Reliability and Theoretical Computer Science

    PD Dr. Martin Stetter, Siemens AG 1 Lernen von Datenmodellen: Fehlerminimierung und Regularisierung: Fehlerminimierung #12;PD Dr. Martin Stetter, Siemens AG 2 Maximum-Likelihood und Fehlerminimierung · Likelihood: Fehlerfunktionen #12;PD Dr. Martin Stetter, Siemens AG 3 · Def. Fehlerfunktion: 0))|(,,( wxfyxl yxyyx ,0),,( =lmit

  4. PD Dr. Martin Stetter, Siemens AG 1 Lernen von Datenmodellen: Approximation

    E-Print Network [OSTI]

    Popeea, Corneliu - Chair for Foundations of Software Reliability and Theoretical Computer Science

    PD Dr. Martin Stetter, Siemens AG 1 Lernen von Datenmodellen: Approximation · Bayes`sches Schließen: Approximation #12;PD Dr. Martin Stetter, Siemens AG 2 Ziel maschinellen Lernens (=statistische Inferenz) · Man Datenmodellen: Approximation #12;PD Dr. Martin Stetter, Siemens AG 3 Bayes`sches Schließen · Es gilt, die Daten

  5. Carl von Ossietzky Universitt Oldenburg Fachbereich Physik, Tel. 0441/798-3522

    E-Print Network [OSTI]

    Oldenburg, Carl von Ossietzky Universität

    zusam- menhält. J. Peinke 27.11.2000 Dr. Klaus-Peter Hinz Universität Giessen, Institut für An/Energie- und Umweltmanagement Elektrizitätserzeugung jenseits der Kernenergie G. Bauer 29.1.2001 Dr. Rudi-Schichten G. Bauer 5.2.2001 Dr. Thomas Unold Universität Oldenburg, FB Physik Die Rolle von Defekten

  6. Entwicklung eines Qualittsmodells fr die Generierung von Digitalen Gelndemodellen aus Airborne Laser Scanning

    E-Print Network [OSTI]

    Giger, Christine

    Laser Scanning Dr. sc. ETH Jürg Lüthy Zürich, 2008 #12;#12;Diese Publikation ist eine editierte Version Geländemodellen aus Airborne Laser Scanning A B H A N D L U N G zur Erlangung des Titels DOKTOR DER WISSENSCHAFTEN Qualitätsmodells für die Generierung von Digitalen Geländemodellen aus Airborne Laser Scanning Copyright © 2008

  7. Press Release Von Roll Inova to build the UK's largest energy-from-waste

    E-Print Network [OSTI]

    Columbia University

    , and regenerative heat recovery is used to boost the plant's overall energy efficiency. The majority of the waste and commercial waste per year in average and generate 72 MW of electrical energy. Riverside Resource Recovery LtdPress Release Von Roll Inova to build the UK's largest energy-from-waste plant Zürich, September, 1

  8. E-Print Network 3.0 - adelbert von chamisso Sample Search Results

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    May (fl.), F. W. H. A. von Humboldt et A. J. A. Bonpland s.n. (B-W 02374 -00 0... here): SURINAME. Loco non indicato, (fl.), C. G. Dahlberg s.n. (SBT 4.2.7.83). As Chamisso... ),...

  9. The solar proton events in 2012 as observed by MIPAS T. von Clarmann,1

    E-Print Network [OSTI]

    Jackman, Charles H.

    The solar proton events in 2012 as observed by MIPAS T. von Clarmann,1 B. Funke,2 M. López proton events (SPE) on 23­30 January and 7­15 March 2012, the Michelson Interferometer for Passive-Puertas, S. Kellmann, A. Linden, G. P. Stiller, C. H. Jackman, and V. L. Harvey (2013), The solar proton

  10. Thermoelectric Properties Modeling of Bi2Te3 Seungwon Lee and Paul von Allmen

    E-Print Network [OSTI]

    Goddard III, William A.

    Thermoelectric Properties Modeling of Bi2Te3 Seungwon Lee and Paul von Allmen Jet propulsion/23/2005 Overview · Introduce EZTB a modeling tool for thermoelectric properties using a tight-binding model-binding parameters for Bi2Te3. · Present the accuracy of the modeling tool with the thermoelectric properties of Bi2

  11. GESTIFTET VON: Der regionalverband bayern e.V. in der Deutschen Physikalischen

    E-Print Network [OSTI]

    Ludwig-Maximilians-Universität, München

    . The Linde Group ist ein weltweit führendes Gase- und engineering- unternehmen, das mit rund 62.000 Mitarbeitern in mehr als 100 Ländern vertreten ist. Die unternehmenszentrale hat ihren sitz in München. Linde beginn an geprägt. Der unternehmensgründer, Carl von Linde (1842­1934), war Professor für theoretische

  12. John von Neumann Institute for Computing Inhibition of Fibril Formation of

    E-Print Network [OSTI]

    Kouza, Maksim

    John von Neumann Institute for Computing Inhibition of Fibril Formation of Beta-Amyloid Peptides N of Fibril Formation of Beta-Amyloid Peptides Nguyen Sy Lam1 , Maksim Kouza2 , Hoang Zung1 , and Mai Suan Li2 the aggregation process. 1 Introduction In many cases protein aggregates take the form of amyloid fibrils, which

  13. John von Neumann Institute for Computing Different Types of Protein Folding Identified with

    E-Print Network [OSTI]

    Janke, Wolfhard

    John von Neumann Institute for Computing Different Types of Protein Folding Identified://www.fz-juelich.de/nic-series/volume40 #12;Different Types of Protein Folding Identified with a Coarse-Grained Heteropolymer Model Stefan The identification of folding channels is one of the key tasks of protein folding studies. While secondary structures

  14. Cloud Computing: a Perspective Study Lizhe WANG, Gregor von LASZEWSKI, Younge ANDREW, Xi HE

    E-Print Network [OSTI]

    Cloud Computing: a Perspective Study Lizhe WANG, Gregor von LASZEWSKI, Younge ANDREW, Xi HE Service@ntu.edu.sg Received 1 Dec 2008 Abstract The Cloud computing emerges as a new computing paradigm which aims to provide study the Cloud computing paradigm from various aspects, such as definitions, distinct features

  15. Spacetime Defects von K\\'arm\\'an vortex street like configurations

    E-Print Network [OSTI]

    Letelier, P S

    2001-01-01T23:59:59.000Z

    A special arrangement of spinning strings with dislocations similar to a von K\\'arm\\'an vortex street is studied. We numerically solve the geodesic equations for the special case of a test particle moving along twoinfinite rows of pure dislocations and also discuss the case of pure spinning defects.

  16. Seite 1 von 1 Antrag auf eine nderung im Modulkatalog der Fakultt EI

    E-Print Network [OSTI]

    Kuehnlenz, Kolja

    Seite 1 von 1 Antrag auf eine Änderung im Modulkatalog der Fakultät EI FR-Sitzung am Antragsteller (Modulverantwortlicher) Modul-ID EI Name des Moduls SWS: V / Ü / P ECTS: WS SoSe Dozent/en Art der Änderung: Streichung in einer Studienrichtungsempfehlung im BSc EI enthalten? Ja; Nein Die geplanten Änderungen sind mit

  17. NANOTECHNOLOGY CENTER Eine Partnerschaft in Nanotechnologie von IBM Research und ETH Zrich

    E-Print Network [OSTI]

    Cachin, Christian

    NANOTECHNOLOGY CENTER Eine Partnerschaft in Nanotechnologie von IBM Research und ETH Zürich and Rohrer Nanotechnology Center is part of a strategic partnership in nanosciences with ETH Zurich, one FACT SHEET Above: The campus of IBM Research - Zurich Right: The Binnig and Rohrer Nanotechnology

  18. Das Deutsche Elektronen-Synchrotron DESY ist ei-nes von 15 Mitgliedern in der Helmholtz-Gemeinschaft

    E-Print Network [OSTI]

    Vorwort Vorwort Das Deutsche Elektronen-Synchrotron DESY ist ei- nes von 15 Mitgliedern in der benötigt werden. Neben DESY beteiligen sich BESSY, das Max-Born-Institut Berlin und die TU

  19. War as Aesthetic: The Philosophy of Carl von Clausewitz as the Embodiment of John Dewey's Concept of Experience 

    E-Print Network [OSTI]

    De Berg, Oak Herbert

    2011-10-21T23:59:59.000Z

    This dissertation confirms war as the zenith of aesthetic experience and demonstrates the pragmatic nature of war through explication of John Dewey’s aesthetic philosophy. Likewise, the coherency of Carl von Clausewitz’s philosophy parallels Dewey...

  20. Grenzverteilungen von normierten und zentrierten Maxima (Xk), k IN, nicht degenerierte i.i.d. ZV mit Verteilungsfunktion F.

    E-Print Network [OSTI]

    Dragoti-Ã?ela, Eranda

    - bn) = H. Notation: X MDA(H) (F MDA(H)). Theorem 8 (Charakterisierung von MDA) F MDA(H) mit Extremwertverteilung Z gibt f¨ur die X MDA(Z). 49 #12;Beispiel 20 (Maxima der Exponentialverteilung) Sei (Xk) eine Folge von i.i.d. ZV mit Verteilungsfunktion F, F(x) = 1 - e-x f¨ur x 0. Zeigen Sie, dass F MDA() mit

  1. Grenzverteilungen von normierten und zentrierten Maxima (Xk), k IN, nicht degenerierte i.i.d. ZV mit Verteilungsfunktion F.

    E-Print Network [OSTI]

    Dragoti-Ã?ela, Eranda

    - bn) = H. Notation: X MDA(H) (F MDA(H)). Theorem 8 (Charakterisierung von MDA) F MDA(H) mit Extremwertverteilung Z gibt f¨ur die X MDA(Z). 48 #12;Beispiel 20 (Maxima der Exponentialverteilung) Sei (Xk) eine Folge von i.i.d. ZV mit Verteilungsfunktion F, F(x) = 1 - e-x f¨ur x 0. Zeigen Sie, dass F MDA() mit

  2. Auxiliary quantization constraints on the von Roos ordering-ambiguity at zero binding energies; azimuthally symmetrized cylindrical coordinates

    E-Print Network [OSTI]

    Omar Mustafa

    2012-08-01T23:59:59.000Z

    Using azimuthally symmetrized cylindrical coordinates, we report the consequences of zero-energy quantal states on the von Roos Hamiltonian. A position-dependent mass M({\\rho},\\phi,z)=bz^{j}{\\rho}^{2\\u{psion}+1}/2 is used. We show that the zero-energy setting not only offers an additional degree of freedom towards feasible separability for the von Roos Hamiltonian, but also manifestly yields auxiliary quantized ambiguity parametric constraints.

  3. Single-cone real-space finite difference schemes for the Dirac von Neumann equation

    E-Print Network [OSTI]

    Schreilechner, Magdalena

    2015-01-01T23:59:59.000Z

    Two finite difference schemes for the numerical treatment of the von Neumann equation for the (2+1)D Dirac Hamiltonian are presented. Both utilize a single-cone staggered space-time grid which ensures a single-cone energy dispersion to formulate a numerical treatment of the mixed-state dynamics within the von Neumann equation. The first scheme executes the time-derivative according to the product rule for "bra" and "ket" indices of the density operator. It therefore directly inherits all the favorable properties of the difference scheme for the pure-state Dirac equation and conserves positivity. The second scheme proposed here performs the time-derivative in one sweep. This direct scheme is investigated regarding stability and convergence. Both schemes are tested numerically for elementary simulations using parameters which pertain to topological insulator surface states. Application of the schemes to a Dirac Lindblad equation and real-space-time Green's function formulations are discussed.

  4. Time evolution of gluon coherent state and its von Neumann entropy in heavy-ion collisions

    E-Print Network [OSTI]

    Hideaki Iida; Teiji Kunihiro; Akira Ohnishi; Toru T. Takahashi

    2014-10-27T23:59:59.000Z

    We propose a new prescription for evaluating a von Neumann entropy in the initial stage of high-energy heavy-ion collisions utilizing the time evolution of classical Yang-Mills (CYM) field: The von Neumann entropy is computed for the quantum coherent states constructed so as to give the classical gluon fields as the expectation values. The entropy is to be liberated when the complete decoherence is achieved. As a demonstration, the time evolution of the CYM dynamics is solved with an initial condition which mimics the Glasma state, though in a non-expanding geometry; the Glasma state is characterized by the longitudinal color-electric and -magnetic fields with gluon fields' fluctuations around it. We find that the initial longitudinal fluctuations of the fields play essential roles for the entropy production in two ways: First, the field fluctuations at $t=0$ themselves act as a source of the von Neumann entropy prepared before the time evolution. Second, the initial fluctuations triggers field instabilities, and hence the larger the strength of them, the more the entropy production at later time.

  5. Toolbox Safety Talk Heat Stress

    E-Print Network [OSTI]

    Pawlowski, Wojtek

    Toolbox Safety Talk Heat Stress Environmental Health & Safety Facilities Safety & Health Section for inducing heat stress. When the body is unable to cool itself by sweating, several heat-induced illnesses Stress · Know signs/symptoms of heat-related illnesses; monitor yourself and coworkers. · Block out

  6. Contact stress sensor

    DOE Patents [OSTI]

    Kotovsky, Jack

    2014-02-11T23:59:59.000Z

    A method for producing a contact stress sensor that includes one or more MEMS fabricated sensor elements, where each sensor element of includes a thin non-recessed portion, a recessed portion and a pressure sensitive element adjacent to the recessed portion. An electric circuit is connected to the pressure sensitive element. The circuit includes a pressure signal circuit element configured to provide a signal upon movement of the pressure sensitive element.

  7. Stress analysis by photoelasticity

    E-Print Network [OSTI]

    Kothari, Mahesh A

    1967-01-01T23:59:59.000Z

    -Interloc'-ing Systemize of Stress Trajectories Fringes Model and Material Fringe Value Obtaining Photoelastic Data THE REDUCTION OE DATA FROM TWO DIMENSIONAL PHOTOELASTIC TESTS Shear Difference Method PRACTICAL APPLICATION OF PHOTO- ELASTICITI ~ St ess...' the displacement of an ether particle from its original position can 'oe represented. at any irstant by a vector, called the light vector. I " the plane containin the light vector and the direction of propagation rema'ns fixed from instant to instant, the li...

  8. Thermal stresses in laminated beams

    E-Print Network [OSTI]

    Marcano, Victor Manuel

    1983-01-01T23:59:59.000Z

    Stresses Acting on a Section of the Laminated Beam -------- 15 5. Loading Geometry and Material Characteristics of the Test Problem 21 6. Simply-Supported Beam with a Sinusoidal Load--------- 30 7. Shear Stress Distribution for a Simply- Supported... 24. Normal Stress Distribution for a Cantilever Laminated Beam, T-Z sinzx/L --------------- 58 m. i 25. Axial Stress Distribution for a Cantilever Laminated Bearq, T-T (2z/8+1) 2 mi 27. Normal Stress Distribution for ("/L) ? ---- 6O 2 a...

  9. Thermal stresses in laminated beams 

    E-Print Network [OSTI]

    Marcano, Victor Manuel

    1983-01-01T23:59:59.000Z

    Stresses Acting on a Section of the Laminated Beam -------- 15 5. Loading Geometry and Material Characteristics of the Test Problem 21 6. Simply-Supported Beam with a Sinusoidal Load--------- 30 7. Shear Stress Distribution for a Simply- Supported... 24. Normal Stress Distribution for a Cantilever Laminated Beam, T-Z sinzx/L --------------- 58 m. i 25. Axial Stress Distribution for a Cantilever Laminated Bearq, T-T (2z/8+1) 2 mi 27. Normal Stress Distribution for ("/L) ? ---- 6O 2 a...

  10. Produktion von geladenen Pionen und Kaonen, Protonen, Antiprotonen und $\\phi$-Mesonen in ultrarelativistischen Blei-Blei-Stossen bei 158 GeV pro Nukleon

    E-Print Network [OSTI]

    Mock, A

    1997-01-01T23:59:59.000Z

    Produktion von geladenen Pionen und Kaonen, Protonen, Antiprotonen und $\\phi$-Mesonen in ultrarelativistischen Blei-Blei-Stossen bei 158 GeV pro Nukleon

  11. A luminescent nanocrystal stress gauge

    SciTech Connect (OSTI)

    Choi, Charina; Koski, Kristie; Olson, Andrew; Alivisatos, Paul

    2010-10-25T23:59:59.000Z

    Microscale mechanical forces can determine important outcomes ranging from the site of material fracture to stem cell fate. However, local stresses in a vast majority of systems cannot be measured due to the limitations of current techniques. In this work, we present the design and implementation of the CdSe/CdS core/shell tetrapod nanocrystal, a local stress sensor with bright luminescence readout. We calibrate the tetrapod luminescence response to stress, and use the luminescence signal to report the spatial distribution of local stresses in single polyester fibers under uniaxial strain. The bright stress-dependent emission of the tetrapod, its nanoscale size, and its colloidal nature provide a unique tool that may be incorporated into a variety of micromechanical systems including materials and biological samples to quantify local stresses with high spatial resolution.

  12. Quantum Statistical Mechanics. I. Decoherence, Wave Function Collapse, and the von Neumann Density Matrix

    E-Print Network [OSTI]

    Phil Attard

    2013-11-25T23:59:59.000Z

    The probability operator is derived from first principles for an equilibrium quantum system. It is also shown that the superposition states collapse into a mixture of states giving the conventional von Neumann trace form for the quantum average. The mechanism for the collapse is found to be quite general: it results from the conservation law for a conserved, exchangeable variable (such as energy) and the entanglement of the total system wave function that necessarily follows. The relevance of the present results to the einselection mechanism for decoherence, to the quantum measurement problem, and to the classical nature of the macroscopic world are discussed.

  13. 43. Zur aktuellen Situation von Apis mel-lifera meda im Iran. K Bienefeld 1, GH Tah-K Bienefeld1 , GH Tah-

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    43. Zur aktuellen Situation von Apis mel- lifera meda im Iran. K Bienefeld 1, GH Tah-K Bienefeld1, Iran; 3 Institut für Bienenkunde, Karl-von- Frisch-Weg 2, D-61440 Oberursel, Deutsch- land) Bis zu den in Iran Up to the political changes in 1979, many queens (Midnight and Starline hybrids) were imported

  14. Butz, T. and von Stryk, O.: Modelling and Simulation of ER and MR Fluid Dampers 1 ZAMM Z. angew. Math. Mech. 78 (1998) 0, 122

    E-Print Network [OSTI]

    Stryk, Oskar von

    Butz, T. and von Stryk, O.: Modelling and Simulation of ER and MR Fluid Dampers 1 ZAMM · Z. angew. Math. Mech. 78 (1998) 0, 1­22 Butz, T.; von Stryk, O. Modelling and Simulation of Electro, phenomenological models, numerical simulation, pas- sive suspension MSC (1991): 65C20, 76A05 1 Introduction Electro

  15. HTTF Core Stress Analysis

    SciTech Connect (OSTI)

    Brian D. Hawkes; Richard Schultz

    2012-07-01T23:59:59.000Z

    In accordance with the need to determine whether cracking of the ceramic core disks which will be constructed and used in the High Temperature Test Facility (HTTF) for heatup and cooldown experiments, a set of calculation were performed using Abaqus to investigate the thermal stresses levels and likelihood for cracking. The calculations showed that using the material properties provided for the Greencast 94F ceramic, cracking is predicted to occur. However, this modeling does not predict the size or length of the actual cracks. It is quite likely that cracks will be narrow with rough walls which would impede the flow of coolant gases entering the cracks. Based on data recorded at Oregon State University using Greencast 94F samples that were heated and cooled at prescribed rates, it was concluded that the likelihood that the cracks would be detrimental to the experimental objectives is small.

  16. Residual stresses and stress corrosion cracking in pipe fittings

    SciTech Connect (OSTI)

    Parrington, R.J.; Scott, J.J.; Torres, F.

    1994-06-01T23:59:59.000Z

    Residual stresses can play a key role in the SCC performance of susceptible materials in PWR primary water applications. Residual stresses are stresses stored within the metal that develop during deformation and persist in the absence of external forces or temperature gradients. Sources of residual stresses in pipe fittings include fabrication processes, installation and welding. There are a number of methods to characterize the magnitude and orientation of residual stresses. These include numerical analysis, chemical cracking tests, and measurement (e.g., X-ray diffraction, neutron diffraction, strain gage/hole drilling, strain gage/trepanning, strain gage/section and layer removal, and acoustics). This paper presents 400 C steam SCC test results demonstrating that residual stresses in as-fabricated Alloy 600 pipe fittings are sufficient to induce SCC. Residual stresses present in as-fabricated pipe fittings are characterized by chemical cracking tests (stainless steel fittings tested in boiling magnesium chloride solution) and by the sectioning and layer removal (SLR) technique.

  17. 1995, 33(10):2757.J. Clin. Microbiol. T Eaton, J O Falkinham 3rd and C F von Reyn

    E-Print Network [OSTI]

    Falkinham, Joseph

    1995, 33(10):2757.J. Clin. Microbiol. T Eaton, J O Falkinham 3rd and C F von Reyn cigarettes, American Society for Microbiology NOTES Recovery of Mycobacterium avium from Cigarettes TWILLA EATON,1 glass filter holders (Millipore Corporation, Bedford,

  18. PEEM Thermal Stress and Reliability (Presentation)

    SciTech Connect (OSTI)

    O'Keefe, M. P.

    2007-11-08T23:59:59.000Z

    Advancing power electronics thermal stress and reliability is a critical factor in power electronics equipment. NREL aims to improve thermal stress and reliability of power electronics technologies.

  19. Von K\\'arm\\'an Vortex Street within an Impacting Drop

    E-Print Network [OSTI]

    Thoraval, Marie-Jean; Etoh, Takeharu Goji; Popinet, Stephane; Ray, Pascal; Josserand, Christophe; Zaleski, Stephane; Thoroddsen, Sigurdur

    2012-01-01T23:59:59.000Z

    The splashing of a drop impacting onto a liquid pool produces a range of different sized micro-droplets. At high impact velocities, the most significant source of these droplets is a thin liquid jet emerging at the start of the impact from the neck that connects the drop to the pool. We use ultra-high-speed video imaging in combination with high-resolution numerical simulations to show how the ejecta gives way to irregular splashing. At higher Reynolds number, its base becomes unstable, shedding vortex rings into the liquid from the free surface in an axisymmetric von K\\'arm\\'an vortex street, thus breaking the ejecta sheet as it forms.

  20. Nr. 210 / 2014 // 4. Nov. 2014 Von re.: Dr. Markus Zanner, Kanzler der Universitt Bayreuth; Prof. Dr. Stefan Leible, Prsident

    E-Print Network [OSTI]

    Ott, Albrecht

    S. 1/ 5 Nr. 210 / 2014 // 4. Nov. 2014 Von re.: Dr. Markus Zanner, Kanzler der Universität Bayreuth Prof. Dr. Stefan Leible, dem Kanzler der Universi- tät Dr. Markus Zanner und dem Vorsitzenden des zu können", erklärt Dr. Markus Zanner. ,,Die Gespräche mit der MeinFernbus GmbH sind immer kooperativ

  1. Litigation Stress: Causes and Remedies

    E-Print Network [OSTI]

    unknown authors

    2000-01-01T23:59:59.000Z

    Being named a defendant in a medical malpractice lawsuit can be a devastating experience. It is particularly painful for first-time defendants who experience the blow of having their professional competence questioned, along with a host of other emotions attendant to litigation, such as anger, fear, frustration, self-doubt and self-pity. Combined, these effects can create a high degree of psychological stress that can endanger the physician’s mental, physical and emotional well-being. Researchers who have studied the subject have coined the term “litigation stress syndrome ” to describe the condition that in some way affects most medical professionals when they are sued

  2. Enhanced von Weizsäcker Wang-Govind-Carter kinetic energy density functional for semiconductors

    SciTech Connect (OSTI)

    Shin, Ilgyou [Department of Chemistry, Princeton University, Princeton, New Jersey 08544-1009 (United States)] [Department of Chemistry, Princeton University, Princeton, New Jersey 08544-1009 (United States); Carter, Emily A., E-mail: eac@princeton.edu [Department of Mechanical and Aerospace Engineering, Program in Applied and Computational Mathematics, and Andlinger Center for Energy and the Environment, Princeton University, Princeton, New Jersey 08544-5263 (United States)

    2014-05-14T23:59:59.000Z

    We propose a new form of orbital-free (OF) kinetic energy density functional (KEDF) for semiconductors that is based on the Wang-Govind-Carter (WGC99) nonlocal KEDF. We enhance within the latter the semi-local von Weizsäcker KEDF term, which is exact for a single orbital. The enhancement factor we introduce is related to the extent to which the electron density is localized. The accuracy of the new KEDF is benchmarked against Kohn-Sham density functional theory (KSDFT) by comparing predicted energy differences between phases, equilibrium volumes, and bulk moduli for various semiconductors, along with metal-insulator phase transition pressures. We also compare point defect and (100) surface energies in silicon for a broad test of its applicability. This new KEDF accurately reproduces the exact non-interacting kinetic energy of KSDFT with only one additional adjustable parameter beyond the three parameters in the WGC99 KEDF; it exhibits good transferability between semiconducting to metallic silicon phases and between various III-V semiconductors without parameter adjustment. Overall, this KEDF is more accurate than previously proposed OF KEDFs (e.g., the Huang-Carter (HC) KEDF) for semiconductors, while the computational efficiency remains at the level of the WGC99 KEDF (several hundred times faster than the HC KEDF). This accurate, fast, and transferable new KEDF holds considerable promise for large-scale OFDFT simulations of metallic through semiconducting materials.

  3. Microelectromechanical systems contact stress sensor

    DOE Patents [OSTI]

    Kotovsky, Jack (Oakland, CA)

    2007-12-25T23:59:59.000Z

    A microelectromechanical systems stress sensor comprising a microelectromechanical systems silicon body. A recess is formed in the silicon body. A silicon element extends into the recess. The silicon element has limited freedom of movement within the recess. An electrical circuit in the silicon element includes a piezoresistor material that allows for sensing changes in resistance that is proportional to bending of the silicon element.

  4. Transcriptomic and Metagenomic Exploration of Agave Drought and Stress Tolerance

    E-Print Network [OSTI]

    Gross, Stephen

    2013-01-01T23:59:59.000Z

    proximal distal distal Heat stress Optimal conditions Kn1of agaves subjected to heat and drought stress in controlledresponses to heat and drought stress. A B A. deserti

  5. Cell Component Accelerated Stress Test Protocols for PEM Fuel...

    Broader source: Energy.gov (indexed) [DOE]

    Cell Component Accelerated Stress Test Protocols for PEM Fuel Cells Cell Component Accelerated Stress Test Protocols for PEM Fuel Cells Accelerated Stress Test Protocols for PEM...

  6. Microstructural Design for Stress Wave Energy Management /

    E-Print Network [OSTI]

    Tehranian, Aref

    2013-01-01T23:59:59.000Z

    Nemat-Nasser, Stress-wave energy management through materialNasser, S. , 2010. Stress-wave energy management throughconstitute pressure wave energy and/or shear wave energy.

  7. Capacitive Stress Transducers in Model Dipole Magnets

    E-Print Network [OSTI]

    Benson, Christopher P.

    2010-07-14T23:59:59.000Z

    Capacitive stress transducers are used to measure mechanical stresses in the windings of superconducting dipole magnets. These transducers consist of a bonded laminate composed of alternating foils of stainless steel and a high-strength polymer...

  8. Determination of Longitudinal Stress in Rails

    E-Print Network [OSTI]

    Djayaputra, Ferdinand

    2012-02-14T23:59:59.000Z

    The objective of this research is to determine the longitudinal stress in rails by using the polarization of Rayleigh waves. Analytical models are developed to describe the effect of applied stress on wave speed and on the polarization of Rayleigh...

  9. Author's personal copy Integrating the stress response

    E-Print Network [OSTI]

    Morimoto, Richard

    protein-folding homeostasis (proteostasis). Although the regulation of stress responses, such as the heat biogenesis requirements or exposure to proteotoxic environmental conditions, such as heat, oxidative stress of the stress response and proteostasis in C. elegans. The role of heat-shock proteins in cytoprotection

  10. Residual Stresses in Weldments by Neutron Diffraction

    E-Print Network [OSTI]

    Bandara, Arosha

    Rectors and Pressurised Water Reactors Source of Problem · Internal Residual Stress · Material propertiesResidual Stresses in Weldments by Neutron Diffraction Shanmukha Rao M, Jon James, Shirley Northover of Residual Stress inside Materials Material: 3 Pass Weld Austenitic Stainless Steel Working Principle

  11. T-Quark Mass and Hyperfinite II1 von Neumann factor

    E-Print Network [OSTI]

    Frank Smith Jr.

    2004-02-12T23:59:59.000Z

    A theoretical model based on the D4 Lie Algebra and Hermitian Symmetric Spaces D5 / D4xU(1) and E6 / D5xU(1) allows calculation of ratios of tree-level particle masses (quark masses being constituent masses): Me-neutrino = Mmu-neutrino = Mtau-neutrino = 0 Me = 0.5110 MeV (assumed); Md = Mu = 312.8 MeV; Mmu = 104.8 MeV; Ms = 625 MeV; Mc = 2.09 GeV; Mtau = 1.88 GeV; Mb = 5.63 GeV; Mt = 130 GeV; W+/- mass = 80.326 GeV; Z0 mass = 91.862 GeV; Higgs mass = 145.8 GeV; Higgs VEV = 252.5 GeV; and ratios of force strength constants: (Ggravity)(Mproton)2 = 5 x 10-39 (asssumed); EM fine structure constant = 1/137.03608; Gfermi = (Gweak)(Mproton)2 = 1.02 x 10-5; color force strength = 0.6286 (at 0.245 GeV). With Nonperturbative QCD etc taken into account the color force strength = 0.123 (at 91 GeV). Fermilab (1994) says that Mt = about 170 GeV but I say (1984) that Mt = about 130 GeV. The theoretical Lagrangian is based on the structure of the real Cl(1,7) Clifford algebra which, through 8-fold periodicity, may produce a real Hyperfinite II1 von Neumann Algebra factor.

  12. Decoherent histories for a particle coupled to a von Neumann apparatus

    E-Print Network [OSTI]

    Francesc S. Roig

    2015-05-25T23:59:59.000Z

    Using the Gell-Mann and Hartle formalism of generalized quantum mechanics of closed systems, we study coarse-grained decoherent histories. The system under consideration is one-dimensional and consists of a particle coupled to a von Neumann apparatus that measures its position. The particle moves in a quadratic potential; in particular we consider a driven harmonic oscillator. The real line is divided into intervals of the same length, and coarse-grained histories are defined by the arithmetic average of the initial and final position of the particle to be within one of these intervals. The position of the pointer correlates with this arithmetic average. In addition a constant term is added to this average, which is a result of the presence of a driving force on the oscillator. We investigate decoherence for such histories via the decoherence functional for the particle-apparatus. An exact expression for this functional has been derived. If the particle or the pointer of the apparatus is in an exact position state initially, then exact decoherence ensues, and the relative probability for such histories is obtained. If the initial state of the particle, which is centered at some arbitrary point in the $x$-axis, is narrow compared to the width of the intervals on the $x$-axis, then we obtain approximate decoherence. The same result follows if the initial state of the pointer is narrow. In these two situations, we evaluate expressions for the decoherence functional qualitatively and quantitatively. In the latter case we obtain the first two terms in an expansion in powers of the width of the initial state of the particle or the pointer respectively. Approximate relative probabilities can be assigned in this case, and we have obtained an expansion up to second order in powers of the width of the initial state for an expression for an upper bound of these probabilities.

  13. PUFF TOO: a residual stress experiment

    SciTech Connect (OSTI)

    Smith, C.W.

    1980-04-01T23:59:59.000Z

    Following the passage of the dynamic effects in a contained explosive detonation, there remains a strong compressive stress field in the material about the cavity. In this experiment, a 454-kg (1000 lb) sphere of high explosive was detonated in saturated ashfall tuff. Instrumentation measured peak stresses over the range of 0.1 to 6.0 GPa (1 to 6 kbar) and the complete stress-time waveform, including the so-called residual stress, at the 0.1 GPa (1 kbar) peak stress range. Mineback revealed detonation-induced fractures and fractures induced by postevent work.

  14. Growth-optimal investments and numeraire portfolios under transaction costs: An analysis based on the von Neumann-Gale model

    E-Print Network [OSTI]

    Bahsoun, Wael; Taksar, Michael I

    2009-01-01T23:59:59.000Z

    The aim of this work is to extend the capital growth theory developed by Kelly, Breiman, Cover and others to asset market models with transaction costs. We define a natural generalization of the notion of a numeraire portfolio proposed by Long and show how such portfolios can be used for constructing growth-optimal investment strategies. The analysis is based on the classical von Neumann-Gale model of economic dynamics, a stochastic version of which we use as a framework for the modelling of financial markets with frictions.

  15. Stress Test | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov YouKizildere IRaghuraji Agro Industries PvtStratosolar Jump to: navigation, search Name Stratosolar Address 3411OpenStress

  16. Holographic stress tensor at finite coupling

    E-Print Network [OSTI]

    Kallol Sen; Aninda Sinha

    2014-11-27T23:59:59.000Z

    We calculate one, two and three point functions of the holographic stress tensor for any bulk Lagrangian of the form ${\\mathcal{L}}(g^{ab}, R_{abcd}, \

  17. A non-linear elastic constitutive framework for replicating plastic deformation in solids.

    SciTech Connect (OSTI)

    Roberts, Scott Alan; Schunk, Peter Randall

    2014-02-01T23:59:59.000Z

    Ductile metals and other materials typically deform plastically under large applied loads; a behavior most often modeled using plastic deformation constitutive models. However, it is possible to capture some of the key behaviors of plastic deformation using only the framework for nonlinear elastic mechanics. In this paper, we develop a phenomenological, hysteretic, nonlinear elastic constitutive model that captures many of the features expected of a plastic deformation model. This model is based on calculating a secant modulus directly from a material's stress-strain curve. Scalar stress and strain values are obtained in three dimensions by using the von Mises invariants. Hysteresis is incorporated by tracking an additional history variable and assuming an elastic unloading response. This model is demonstrated in both single- and multi-element simulations under varying strain conditions.

  18. Stress-Strain Model of Unconfined and Confined Concrete and Stress-block Parameters

    E-Print Network [OSTI]

    Murugesan Reddiar, Madhu Karthik

    2010-07-14T23:59:59.000Z

    Stress-strain relations for unconfined and confined concrete are proposed to overcome some shortcomings of existing commonly used models. Specifically, existing models are neither easy to invert nor integrate to obtain equivalent rectangular stress...

  19. Stress-Strain Model of Unconfined and Confined Concrete and Stress-block Parameters 

    E-Print Network [OSTI]

    Murugesan Reddiar, Madhu Karthik

    2010-07-14T23:59:59.000Z

    Stress-strain relations for unconfined and confined concrete are proposed to overcome some shortcomings of existing commonly used models. Specifically, existing models are neither easy to invert nor integrate to obtain equivalent rectangular stress...

  20. Stress corrosion cracking under low stress: Continuous or discontinuous Longkui K. Zhu a

    E-Print Network [OSTI]

    Volinsky, Alex A.

    Stress corrosion cracking under low stress: Continuous or discontinuous cracks? Longkui K. Zhu a , Yu Yan a , Jinxu X. Li a , Lijie J. Qiao a, , Alex A. Volinsky b,a a Corrosion and Protection Center. Stress corrosion C. Anodic dissolution a b s t r a c t Two-dimensional and three-dimensional crack

  1. Aggregation Patterns in Stressed Bacteria

    SciTech Connect (OSTI)

    Tsimring, L.; Levine, H. [Institute for Nonlinear Science, University of California at San Diego, La Jolla, California 92093-0402 (United States)] [Institute for Nonlinear Science, University of California at San Diego, La Jolla, California 92093-0402 (United States); Aranson, I. [Deptartment of Physics, Bar-Ilan University, Ramat Gan (Israel)] [Deptartment of Physics, Bar-Ilan University, Ramat Gan (Israel); Ben-Jacob, E.; Cohen, I.; Shochet, O. [School of Physics and Astronomy, Raymond & Beverly Sackler Faculty of Exact Sciences, Tel-Aviv University, Tel-Aviv 69978 (Israel)] [School of Physics and Astronomy, Raymond & Beverly Sackler Faculty of Exact Sciences, Tel-Aviv University, Tel-Aviv 69978 (Israel); Reynolds, W.N. [Complex Systems Division, Los Alamos National Laboratory, Los Alamos New Mexico (United States)] [Complex Systems Division, Los Alamos National Laboratory, Los Alamos New Mexico (United States)

    1995-08-28T23:59:59.000Z

    We study the formation of spot patterns seen in bacterial colonies when the bacteria are subjected to oxidative stress due to hazardous by-products of respiration. The cell density is coupled to a chemoattractant concentration as well as to nutrient and waste fields. The model combines the propagation of a front of motile bacterial radially outward from an initial site, a Turing instability of the uniformly dense state, and a reduction of motility for cells sufficiently far behind the front. The wide variety of patterns seen in the experiments is reproduced by the model by varying the details of the initiation of the chemoattractant emission as well as the transition to a nonmotile phase.

  2. Optical stress generator and detector

    DOE Patents [OSTI]

    Maris, Humphrey J. (Barrington, RI); Stoner, Robert J (Duxbury, MA)

    2001-01-01T23:59:59.000Z

    Disclosed is a system for the characterization of thin films and interfaces between thin films through measurements of their mechanical and thermal properties. In the system light is absorbed in a thin film or in a structure made up of several thin films, and the change in optical transmission or reflection is measured and analyzed. The change in reflection or transmission is used to give information about the ultrasonic waves that are produced in the structure. The information that is obtained from the use of the measurement methods and apparatus of this invention can include: (a) a determination of the thickness of thin films with a speed and accuracy that is improved compared to earlier methods; (b) a determination of the thermal, elastic, and optical properties of thin films; (c) a determination of the stress in thin films; and (d) a characterization of the properties of interfaces, including the presence of roughness and defects.

  3. Optical stress generator and detector

    DOE Patents [OSTI]

    Maris, H.J.; Stoner, R.J.

    1998-05-05T23:59:59.000Z

    Disclosed is a system for the characterization of thin films and interfaces between thin films through measurements of their mechanical and thermal properties. In the system light is absorbed in a thin film or in a structure made up of several thin films, and the change in optical transmission or reflection is measured and analyzed. The change in reflection or transmission is used to give information about the ultrasonic waves that are produced in the structure. The information that is obtained from the use of the measurement methods and apparatus of this invention can include: (a) a determination of the thickness of thin films with a speed and accuracy that is improved compared to earlier methods; (b) a determination of the thermal, elastic, and optical properties of thin films; (c) a determination of the stress in thin films; and (d) a characterization of the properties of interfaces, including the presence of roughness and defects. 32 figs.

  4. Optical stress generator and detector

    DOE Patents [OSTI]

    Maris, Humphrey J. (Barrington, RI); Stoner, Robert J (Duxbury, MA)

    2002-01-01T23:59:59.000Z

    Disclosed is a system for the characterization of thin films and interfaces between thin films through measurements of their mechanical and thermal properties. In the system light is absorbed in a thin film or in a structure made up of several thin films, and the change in optical transmission or reflection is measured and analyzed. The change in reflection or transmission is used to give information about the ultrasonic waves that are produced in the structure. The information that is obtained from the use of the measurement methods and apparatus of this invention can include: (a) a determination of the thickness of thin films with a speed and accuracy that is improved compared to earlier methods; (b) a determination of the thermal, elastic, and optical properties of thin films; (c) a determination of the stress in thin films; and (d) a characterization of the properties of interfaces, including the presence of roughness and defects.

  5. Optical stress generator and detector

    DOE Patents [OSTI]

    Maris, Humphrey J. (Barrington, RI); Stoner, Robert J. (Duxbury, MA)

    1998-01-01T23:59:59.000Z

    Disclosed is a system for the characterization of thin films and interfaces between thin films through measurements of their mechanical and thermal properties. In the system light is absorbed in a thin film or in a structure made up of several thin films, and the change in optical transmission or reflection is measured and analyzed. The change in reflection or transmission is used to give information about the ultrasonic waves that are produced in the structure. The information that is obtained from the use of the measurement methods and apparatus of this invention can include: (a) a determination of the thickness of thin films with a speed and accuracy that is improved compared to earlier methods; (b) a determination of the thermal, elastic, and optical properties of thin films; (c) a determination of the stress in thin films; and (d) a characterization of the properties of interfaces, including the presence of roughness and defects.

  6. Optical stress generator and detector

    DOE Patents [OSTI]

    Maris, Humphrey J. (Barrington, RI); Stoner, Robert J (Duxbury, MA)

    1999-01-01T23:59:59.000Z

    Disclosed is a system for the characterization of thin films and interfaces between thin films through measurements of their mechanical and thermal properties. In the system light is absorbed in a thin film or in a structure made up of several thin films, and the change in optical transmission or reflection is measured and analyzed. The change in reflection or transmission is used to give information about the ultrasonic waves that are produced in the structure. The information that is obtained from the use of the measurement methods and apparatus of this invention can include: (a) a determination of the thickness of thin films with a speed and accuracy that is improved compared to earlier methods; (b) a determination of the thermal, elastic, and optical properties of thin films; (c) a determination of the stress in thin films; and (d) a characterization of the properties of interfaces, including the presence of roughness and defects.

  7. Exploratory test of utility of magnetic insulation for electrostatic accelerators L. R. Grisham, A. von Halle, A. F. Carpe, Guy Rossi, K. R. Gilton et al.

    E-Print Network [OSTI]

    Gilson, Erik

    Exploratory test of utility of magnetic insulation for electrostatic accelerators L. R. Grisham, A;Exploratory test of utility of magnetic insulation for electrostatic accelerators L. R. Grisham,a) A. von a preliminary exploratory test of whether this magnetic insulation approach might be of benefit at a modest

  8. Graphen-Algorithmen Dr. Tobias Baumann Bestimmen Sie die Laufzeit der Algorithmen von Wigderson (fur k-farbbare bzw. 3-farbbare Graphen) genau!

    E-Print Network [OSTI]

    Baumann, Tobias

    Graphen-Algorithmen Dr. Tobias Baumann 5. ¨Ubung Aufgabe 1: Bestimmen Sie die Laufzeit der Algorithmen von Wigderson (f¨ur k-f¨arbbare bzw. 3-f¨arbbare Graphen) genau! Aufgabe 2: Ungleichungen Zeigen¨alligen k-f¨arbbaren Graphen mit n Knoten erzeugt! Erl¨autern Sie die Verwendung des Wahrscheinlichkeits

  9. Die Civil Academy ist ein gemeinsames Programm von BBE und BP Europa SE. Trger und Veranstalter der Civil Academy ist die BBE Geschftsstelle gemeinntzige GmbH.

    E-Print Network [OSTI]

    Reyle, Uwe

    Die Civil Academy ist ein gemeinsames Programm von BBE und BP Europa SE. Träger und Veranstalter der Civil Academy ist die BBE Geschäftsstelle gemeinnützige GmbH. Ausschreibung der 18. Civil Academy Civil Academy ­ Gutes auch gut tun! Du willst mit einer kreativen Idee die Welt zum Besseren verändern

  10. Stressed swelling clay Arpita Pal Bathija1

    E-Print Network [OSTI]

    Liang, Haiyi

    Stressed swelling clay Arpita Pal Bathija1 , Haiyi Liang2 , Ning Lu3 , Manika Prasad4 , and Michael Lee Batzle1 ABSTRACT Clay minerals are present in most sedimentary rocks. They find applicability- spite their abundance and use, swelling of clays under stress has not received enough scientific

  11. STRESS CORROSION CRACKING IN TEAR DROP SPECIMENS

    SciTech Connect (OSTI)

    Lam, P; Philip Zapp, P; Jonathan Duffey, J; Kerry Dunn, K

    2009-05-01T23:59:59.000Z

    Laboratory tests were conducted to investigate the stress corrosion cracking (SCC) of 304L stainless steel used to construct the containment vessels for the storage of plutonium-bearing materials. The tear drop corrosion specimens each with an autogenous weld in the center were placed in contact with moist plutonium oxide and chloride salt mixtures. Cracking was found in two of the specimens in the heat affected zone (HAZ) at the apex area. Finite element analysis was performed to simulate the specimen fabrication for determining the internal stress which caused SCC to occur. It was found that the tensile stress at the crack initiation site was about 30% lower than the highest stress which had been shifted to the shoulders of the specimen due to the specimen fabrication process. This finding appears to indicate that the SCC initiation took place in favor of the possibly weaker weld/base metal interface at a sufficiently high level of background stress. The base material, even subject to a higher tensile stress, was not cracked. The relieving of tensile stress due to SCC initiation and growth in the HAZ and the weld might have foreclosed the potential for cracking at the specimen shoulders where higher stress was found.

  12. STRESSES IN ANISOTROPIC ROCKMASS WITH IRREGULAR TOPOGRAPHY

    E-Print Network [OSTI]

    Pan, Ernie

    topography. The rock massis subject to gravity and surface tractions. The stresses are determined assuming mentioned are limited to rock masses with a horizontal ground surface. The effect of surface topographySTRESSES IN ANISOTROPIC ROCKMASS WITH IRREGULAR TOPOGRAPHY By Ernian Pan,1Student Member, ASCE

  13. MANAGING JOB LOSS and FINANCIAL STRESS

    E-Print Network [OSTI]

    MANAGING JOB LOSS and FINANCIAL STRESS a Personal and Family Guide CENTER ON THE FAMILY #12;2 Managing Job Loss and Financial Stress The issues associated with losing one's job or having hours cut also have other assistance (e.g., job placement, resume preparation, retraining), of which you should

  14. Modeling of stresses at grain boundaries with respect to occurrence of stress corrosion cracking

    SciTech Connect (OSTI)

    Kozaczek, K.J. [Oak Ridge National Lab., TN (United States); Sinharoy, A.; Ruud, C.O. [Pennsylvania State Univ., University Park, PA (United States); McIlree, A.R. [Electric Power Research Institute, Palo Alto, CA (United States)

    1995-12-31T23:59:59.000Z

    The distributions of elastic stresses/strains in the grain boundary regions were studied by the analytical and the finite element models. The grain boundaries represent the sites where stress concentration occurs as a result of discontinuity of elastic properties across the grain boundary and the presence of second phase particles elastically different from the surrounding matrix grains. A quantitative analysis of those stresses for steels and nickel based alloys showed that the stress concentrations in the grain boundary regions are high enough to cause a local microplastic deformation even when the material is in the macroscopic elastic regime. The stress redistribution as a result of such a plastic deformation was discussed.

  15. Evaluation of Heat Stress and Strain in Electric Utility Workers

    E-Print Network [OSTI]

    Brown, Eric Nicholas

    2013-01-01T23:59:59.000Z

    Health Administration. (1994) “Heat Stress. ” OSHA TechnicalAshley, C. “Short-Term Heat Stress Exposure Limits Based onThermal Comfort and the Heat Stress Indices. ” 44 (2006):

  16. DOE Cell Component Accelerated Stress Test Protocols for PEM...

    Broader source: Energy.gov (indexed) [DOE]

    Cell Component Accelerated Stress Test Protocols for PEM Fuel Cells DOE Cell Component Accelerated Stress Test Protocols for PEM Fuel Cells This document describes test protocols...

  17. The influence of the electrochemical stressing (potential step...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    the electrochemical stressing (potential step and potential-static holding) on the degradation of polymer The influence of the electrochemical stressing (potential step and...

  18. Polarization Losses under Accelerated Stress Test Using Multiwalled...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Accelerated Stress Test Using Multiwalled Carbon Nanotube Supported Pt Catalyst in PEM Fuel Cells. Polarization Losses under Accelerated Stress Test Using Multiwalled Carbon...

  19. SciTech Connect: Relationship between critical tensile stress...

    Office of Scientific and Technical Information (OSTI)

    Relationship between critical tensile stress and fracture toughness in mild steel Citation Details In-Document Search Title: Relationship between critical tensile stress and...

  20. Process Control Minitoring by Stress Response

    SciTech Connect (OSTI)

    Hazen, Terry C.; Stahl, David A.

    2006-04-17T23:59:59.000Z

    Environmental contamination with a variety of pollutants hasprompted the development of effective bioremediation strategies. But howcan these processes be best monitored and controlled? One avenue underinvestigation is the development of stress response systems as tools foreffective and general process control. Although the microbial stressresponse has been the subject of intensive laboratory investigation, theenvironmental reflection of the laboratory response to specific stresseshas been little explored. However, it is only within an environmentalcontext, in which microorganisms are constantly exposed to multiplechanging environmental stresses, that there will be full understanding ofmicrobial adaptive resiliency. Knowledge of the stress response in theenvironment will facilitate the control of bioremediation and otherprocesses mediated by complex microbial communities.

  1. CONTOUR. Stress Time History Postprocessor Plotting Program

    SciTech Connect (OSTI)

    Pelessone, D. [CEGA Corporation, San Diego, CA (United States)

    1993-11-01T23:59:59.000Z

    CONTOUR is an in-house computer program which is used at General Atomics to generate contour plots of analysis results obtained from various finite element codes used in stress and thermal analysis of core fuel blocks. The program provides contour and fringe plots of the results in either black and white or color. The input data for CONTOUR is CONDRUM, a word addressable file generated by codes which contain element stresses and nodal displacements such as TWOD and PRINT2. TWOD is a finite element program for linear and nonlinear stress analysis of two-dimensional and axisymmetric solids. PRINT2 is an output processor code for printing data.

  2. Membrane and MEA Accelerated Stress Test Protocols

    Broader source: Energy.gov (indexed) [DOE]

    and MEA Accelerated Stress Test Protocols Presented at High Temperature Membrane Working Group Meeting Washington, DC May 14, 2007 T.G. Benjamin Argonne National Laboratory 2 0 10...

  3. Accelerated Stress Testing, Qualification Testing, HAST, Field...

    Office of Environmental Management (EM)

    stress tests beyond the qualification test levels, which are necessary to predict PV module wear-out. The commercial success of PVs is ultimately based on the long-term...

  4. STRESS MEASUREMENTS IN THE STRIPA GRANITE

    E-Print Network [OSTI]

    Carlsson, H.

    2011-01-01T23:59:59.000Z

    get a ance in the Stripa granite disturo the stress field.tensor in the Stripa granite is to do more measurements atPermeability Test of the Granite in the Stripa Mine and

  5. Stress corrosion crack growth in porous sandstones. 

    E-Print Network [OSTI]

    Ojala, Ira O

    Stress corrosion crack growth occurs when the chemical weakening of strained crack tip bonds facilitates crack propagation. I have examined the effect of chemical processes on the growth of a creack population by carrying out triaxial compression...

  6. Capacitive Stress Gauges in Model Dipole Magnets

    E-Print Network [OSTI]

    Ragland, R. Blake

    2009-06-09T23:59:59.000Z

    Capacitive transducers are used to measure mechanical stress in the windings of superconducting magnets. The transducer consists of a bonded laminate of alternating thin foils of stainless steel and high-strength polymer (polyimide). The thin...

  7. Residual stress in nanocrystalline nickel tungsten electrodeposits

    E-Print Network [OSTI]

    Ziebell, Tiffany D. (Tiffany Dawn)

    2011-01-01T23:59:59.000Z

    Characterizing the residual stress of thick nanocrystalline electrodeposits poses several unique challenges due to their fine grain structure, thickness distribution, and matte surface. We employ a three-dimensional ...

  8. Stress and Telomere Biology: A Lifespan Perspective

    E-Print Network [OSTI]

    2013-01-01T23:59:59.000Z

    Manuscript Entringer S, Buss C, Wadhwa PD. Prenatal stressPubMed: 20962631] Entringer S, Buss C, Wadhwa PD. PrenatalEntringer S, Epel ES, Lin J, Buss C, Shahbaba B, Blackburn

  9. Critical stress for stress corrosion cracking of duplex stainless steel in sour environments

    SciTech Connect (OSTI)

    Miyasaka, A.; Kanamaru, T. [Nippon Steel Corp., Tokai, Aichi (Japan). Nagoya Research and Development Labs.; Ogawa, H. [Nippon Steel Corp., Futtsu, Chiba (Japan). Steel Research Labs.

    1996-08-01T23:59:59.000Z

    The critical stress for initiation of stress corrosion cracking (SCC) of a duplex stainless steel (DSS) in a sour environment was investigated using three stress application techniques: constant-strain, constant-load, and slow strain rate testing (SSRT). The critical stresses for SCC initiation as determined by detailed observation of the alloy surface after the three tests were in good agreement when a newly proposed index was adopted to express the SSRT results combined with crack observations for each test. The effect of cold work (CW) on SCC and pitting resistance of the DSS also was studied. CW did not accelerate SCC when initiation was controlled by pitting. The critical stress for SCC initiation increased with increasing CW and the resultant increase in yield stress.

  10. Calculator programs for pipe stress engineering

    SciTech Connect (OSTI)

    Morgan, K.S.

    1985-01-01T23:59:59.000Z

    This book contains a collection of programs for solving a wide variety of stress problems using both the TI-59 and HP-41CV calculators. Each program is prefaced with a description of the problem to be solved, nomenclature, code restrictions and program limitations. Solutions are explained analytically and then followed by the complete program listing, documentation and checklists. Topics include calculations for pipewall thickness, pressure vessel analysis, reinforcement pads, allowable span, vibration, stress, and two-anchor piping systems.

  11. Rate of environmental change determines stress response specificity

    E-Print Network [OSTI]

    Elowitz, Michael

    as to salt (13), calcium (14), heat, and other stresses (15). Bacteria also contain general stress responseRate of environmental change determines stress response specificity Jonathan W. Younga,1 , James C (received for review August 2, 2012) Cells use general stress response pathways to activate diverse tar- get

  12. Early molecular responses of coral larvae to hyperthermal stress

    E-Print Network [OSTI]

    suggests that heat stress might compromise some components of the coral immune defence and therefore might oxidative stress showed little response at the early hours to heat stress, supporting the proposal that upEarly molecular responses of coral larvae to hyperthermal stress MAURICIO RODRIGUEZ-LANETTY,* SAKI

  13. Internal Stress in a Model Elasto-Plastic Fluid

    E-Print Network [OSTI]

    Takeshi Ooshida; Ken Sekimoto

    2005-12-03T23:59:59.000Z

    Plastic materials can carry memory of past mechanical treatment in the form of internal stress. We introduce a natural definition of the vorticity of internal stress in a simple two-dimensional model of elasto-plastic fluids, which generates the internal stress. We demonstrate how the internal stress is induced under external loading, and how the presence of the internal stress modifies the plastic behavior.

  14. Response of Desulfovibrio vulgaris to Alkaline Stress

    SciTech Connect (OSTI)

    Stolyar, S.; He, Q.; He, Z.; Yang, Z.; Borglin, S.E.; Joyner, D.; Huang, K.; Alm, E.; Hazen, T.C.; Zhou, J.; Wall, J.D.; Arkin, A.P.; Stahl, D.A.

    2007-11-30T23:59:59.000Z

    The response of exponentially growing Desulfovibrio vulgarisHildenborough to pH 10 stress was studied using oligonucleotidemicroarrays and a study set of mutants with genes suggested by microarraydata to be involved in the alkaline stress response deleted. The datashowed that the response of D. vulgaris to increased pH is generallysimilar to that of Escherichia coli but is apparently controlled byunique regulatory circuits since the alternative sigma factors (sigma Sand sigma E) contributing to this stress response in E. coli appear to beabsent in D. vulgaris. Genes previously reported to be up-regulated in E.coli were up-regulated in D. vulgaris; these genes included three ATPasegenes and a tryptophan synthase gene. Transcription of chaperone andprotease genes (encoding ATP-dependent Clp and La proteases and DnaK) wasalso elevated in D. vulgaris. As in E. coli, genes involved in flagellumsynthesis were down-regulated. The transcriptional data also identifiedregulators, distinct from sigma S and sigma E, that are likely part of aD. vulgaris Hildenborough-specific stress response system.Characterization of a study set of mutants with genes implicated inalkaline stress response deleted confirmed that there was protectiveinvolvement of the sodium/proton antiporter NhaC-2, tryptophanase A, andtwo putative regulators/histidine kinases (DVU0331 andDVU2580).

  15. Yield Stress Materials in Soft Condensed Matter

    E-Print Network [OSTI]

    Daniel Bonn; Jose Paredes; Morton M. Denn; Ludovic Berthier; Thibaut Divoux; Sébastien Manneville

    2015-02-18T23:59:59.000Z

    We present a comprehensive review of the physical behavior of yield stress materials in soft condensed matter, which encompasses a broad range of soft materials from colloidal assemblies and gels to emulsions and non-Brownian suspensions. All these disordered materials display a nonlinear response to an external mechanical forcing, which results from the existence of a finite force threshold for flow to occur, the yield stress. We discuss both the physical origin and the rheological consequences associated with this nonlinear behavior. We give an overview of the different experimental techniques developed to measure the yield stress. We discuss extensively the recent progress concerning a microscopic description of the flow dynamics of yield stress materials, emphasizing in particular the role played by relaxation timescales, the interplay between shear flow and aging behavior, the existence of inhomogeneous shear flows and shear bands, wall slip, and non-local effects in confined geometries. We finally review the status of modeling of the shear rheology of yield stress materials in the framework of continuum mechanics.

  16. A model for the symmetry breaking of the reverse Benard-von Karman vortex street produced by a flapping foil

    E-Print Network [OSTI]

    Godoy-Diana, Ramiro; Aider, Jean-Luc; Wesfreid, José Eduardo

    2008-01-01T23:59:59.000Z

    The vortex streets produced by a flapping foil of span-to-chord aspect ratio of 4:1 are studied in a hydrodynamic tunnel experiment. In particular, the mechanisms giving rise to the symmetry breaking of the reverse B\\'enard-von K\\'arm\\'an vortex street that characterizes fish-like swimming and forward flapping flight are examined. Two-dimensional particle image velocimetry measurements in the mid-plane perpendicular to the span axis of the foil are used to characterize the different flow regimes. The deflection angle of the mean jet flow with respect to the horizontal observed in the average velocity field is used as a measure of the asymmetry of the vortex street. Time series of the vorticity field are used to calculate the advection velocity of the vortices with respect to the free-stream, defined as the phase velocity $U_{phase}$, as well as the circulation $\\Gamma$ of each vortex and the spacing $\\xi$ between consecutive vortices in the near wake. The observation that the symmetry breaking results from th...

  17. Thermoplastic deformation of silicon surfaces induced by ultrashort pulsed lasers in submelting conditions

    SciTech Connect (OSTI)

    Tsibidis, G. D. [Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology (FORTH), N. Plastira 100, Vassilika Vouton, 70013, Heraklion, Crete (Greece); Stratakis, E. [Institute of Electronic Structure and Laser (IESL), Foundation for Research and Technology (FORTH), N. Plastira 100, Vassilika Vouton, 70013, Heraklion, Crete (Greece); Department of Materials Science and Technology, University of Crete, 710 03 Heraklion, Crete (Greece); Aifantis, K. E. [Laboratory of Mechanics and Materials, Aristotle University of Thessaloniki, GR-54006 Thessaloniki (Greece)

    2012-03-01T23:59:59.000Z

    A hybrid theoretical model is presented to describe thermoplastic deformation effects on silicon surfaces induced by single and multiple ultrashort pulsed laser irradiation in submelting conditions. An approximation of the Boltzmann transport equation is adopted to describe the laser irradiation process. The evolution of the induced deformation field is described initially by adopting the differential equations of dynamic thermoelasticity while the onset of plastic yielding is described by the von Mises stress. Details of the resulting picometre sized crater, produced by irradiation with a single pulse, are discussed as a function of the imposed conditions and thresholds for the onset of plasticity are computed. Irradiation with multiple pulses leads to ripple formation of nanometre size that originates from the interference of the incident and a surface scattered wave. It is suggested that ultrafast laser induced surface modification in semiconductors is feasible in submelting conditions, and it may act as a precursor of the incubation effects observed at multiple pulse irradiation of materials surfaces.

  18. A High shear stress segment along the San Andreas Fault: Inferences based on near-field stress direction and stress magnitude observations in the Carrizo Plain Area

    SciTech Connect (OSTI)

    Castillo, D. A., [Department of Geology and Geophysics, University of Adelaide (Australia); Younker, L.W. [Lawrence Livermore National Lab., CA (United States)

    1997-01-30T23:59:59.000Z

    Nearly 200 new in-situ determinations of stress directions and stress magnitudes near the Carrizo plain segment of the San Andreas fault indicate a marked change in stress state occurring within 20 km of this principal transform plate boundary. A natural consequence of this stress transition is that if the observed near-field ``fault-oblique`` stress directions are representative of the fault stress state, the Mohr-Coulomb shear stresses resolved on San Andreas sub-parallel planes are substantially greater than previously inferred based on fault-normal compression. Although the directional stress data and near-hydrostatic pore pressures, which exist within 15 km of the fault, support a high shear stress environment near the fault, appealing to elevated pore pressures in the fault zone (Byerlee-Rice Model) merely enhances the likelihood of shear failure. These near-field stress observations raise important questions regarding what previous stress observations have actually been measuring. The ``fault-normal`` stress direction measured out to 70 km from the fault can be interpreted as representing a comparable depth average shear strength of the principal plate boundary. Stress measurements closer to the fault reflect a shallower depth-average representation of the fault zone shear strength. If this is true, only stress observations at fault distances comparable to the seismogenic depth will be representative of the fault zone shear strength. This is consistent with results from dislocation monitoring where there is pronounced shear stress accumulation out to 20 km of the fault as a result of aseismic slip within the lower crust loading the upper locked section. Beyond about 20 km, the shear stress resolved on San Andreas fault-parallel planes becomes negligible. 65 refs., 15 figs.

  19. Ageing of Natural Rubber under Stress

    E-Print Network [OSTI]

    S. M. Clarke; F. Elias; E. M. Terentjev

    2000-05-04T23:59:59.000Z

    We report a dynamical-mechanical study of stress relaxation at small deformation in a natural (polyisoprene) rubber well above its glass transition temperature Tg. We find that an almost complete relaxation of stress takes place over very long periods of time, even though the elastic network integrity is fully retained. The relaxation rate and the long-time equilibrium modulus are sensitive functions of temperature which do not follow time-temperature superposition. Many characteristic features of non-ergodic ageing response are apparent at both short and very long times. We interpret the observed behaviour in terms of the properties of rubber crosslinks, capable of isomerisation under stress, and relate the results to recent models of soft glassy rheology.

  20. Assessment of Wall Shear Stress Changes in Arteries and Veins of Arteriovenous Polytetrafluoroethylene Grafts Using Magnetic Resonance Imaging

    SciTech Connect (OSTI)

    Misra, Sanjay, E-mail: Misra.sanjay@mayo.edu; Woodrum, David A. [Mayo Clinic, Department of Radiology (United States); Homburger, Jay [Medical College of Georgia, Department of Vascular Surgery (United States); Elkouri, Stephane [Centre Hospitalier de I'Universite de Montreal, Department of Vascular Surgery (Canada); Mandrekar, Jayawant N. [Mayo Clinic, Division of Biostatistics (United States); Barocas, Victor [University of Minnesota, Department of Biomedical Engineering (United States); Glockner, James F. [Mayo Clinic, Department of Radiology (United States); Rajan, Dheeraj K. [Toronto General Hospital, University Health Network, Department of Medical Imaging, Division of Vascular and Interventional Radiology (Canada); Mukhopadhyay, Debabrata [Mayo Clinic, Department of Biochemistry and Molecular Biology (United States)

    2006-08-15T23:59:59.000Z

    The purpose of the study was to determine simultaneously the temporal changes in luminal vessel area, blood flow, and wall shear stress (WSS) in both the anastomosed artery (AA) and vein (AV) of arteriovenous polytetrafluoroethylene (PTFE) grafts. PTFE grafts were placed from the iliac artery to the ipsilateral iliac vein in 12 castrated juvenile male pigs. Contrast-enhanced magnetic resonance angiograpgy with cine phase-contrast magnetic resonance imaging was performed. Luminal vessel area, blood flow, and WSS in the aorta, AA, AV, and inferior vena cava were determined at 3 days (D3), 7 days (D7), and 14 days (D14) after graft placement. Elastin von Gieson staining of the AV was performed. The average WSS of the AA was highest at D3 and then decreased by D7 and D14. In contrast, the average WSS and intima-to-media ratio of the AV increased from D3 to D7 and peaked by D14. Similarly, the average area of the AA was highest by D7 and began to approximate the control artery by D14. The average area of the AV had decreased to its lowest by D7. High blood flows through the AA causes a decrease in average WSS and increase in the average luminal vessel area, whereas at the AV, the average WSS and intima-to-media ratio both increase while the average luminal vessel area decreases.

  1. Stress- and Chemistry-Mediated Permeability Enhancement/Degradation in Stimulated Critically-Stressed Fractures

    SciTech Connect (OSTI)

    Derek Elsworth; Abraham S. Grader; Chris Marone; Phillip Halleck; Peter Rose; Igor Faoro; Joshua Taron; André Niemeijer; Hideaki Yasuhara

    2009-03-30T23:59:59.000Z

    This work has investigated the interactions between stress and chemistry in controlling the evolution of permeability in stimulated fractured reservoirs through an integrated program of experimentation and modeling. Flow-through experiments on natural and artificial fractures in Coso diorite have examined the evolution of permeability under paths of mean and deviatoric stresses, including the role of dissolution and precipitation. Models accommodating these behaviors have examined the importance of incorporating the complex couplings between stress and chemistry in examining the evolution of permeability in EGS reservoirs. This document reports the findings of experiment [1,2] and analysis [3,4], in four sequential chapters.

  2. Stress controls the mechanics of collagen networks

    E-Print Network [OSTI]

    Albert James Licup; Stefan Münster; Abhinav Sharma; Michael Sheinman; Louise M. Jawerth; Ben Fabry; David A. Weitz; Fred C. MacKintosh

    2015-03-09T23:59:59.000Z

    Collagen is the main structural and load-bearing element of various connective tissues, where it forms the extracellular matrix that supports cells. It has long been known that collagenous tissues exhibit a highly nonlinear stress-strain relationship (Fung YC, Am J Physiol 213(6),1967; Humphrey JD, Proc R Soc Lond A: Math Phys Eng Sci 459(2029),2003), although the origins of this nonlinearity remain unknown (McMahon TA, Lec Math Life Sci 13,1980). Here, we show that the nonlinear stiffening of reconstituted type I collagen networks is controlled by the applied stress, and that the network stiffness becomes surprisingly insensitive to network concentration. We demonstrate how a simple model for networks of elastic fibers can quantitatively account for the mechanics of reconstituted collagen networks. Our model points to the important role of normal stresses in determining the nonlinear shear elastic response, which can explain the approximate exponential relationship between stress and strain reported for collagenous tissues (Fung YC, Am J Physiol 213(6),1967). This further suggests new principles for the design of synthetic fiber networks with collagen-like properties, as well as a mechanism for the control of the mechanics of such networks.

  3. Environmental Stresses Disrupt Telomere Length Homeostasis

    E-Print Network [OSTI]

    Shamir, Ron

    Environmental Stresses Disrupt Telomere Length Homeostasis Gal Hagit Romano1,2,3. , Yaniv Harari1 and Biotechnology, Tel Aviv University, Tel Aviv, Israel, 2 Blavatnik School of Computer Science, Tel Aviv response to environmental signals. These results demonstrate that telomere length can be manipulated

  4. Particle creation from the quantum stress tensor

    E-Print Network [OSTI]

    Firouzjaee, Javad T

    2015-01-01T23:59:59.000Z

    Among the different methods to derive particle creation, finding the quantum stress tensor expectation value gives a covariant quantity which can be used for examining the back-reaction issue. However this tensor also includes vacuum polarization in a way that depends on the vacuum chosen. Here we review different aspects of particle creation by looking at energy conservation and at the quantum stress tensor. It will be shown that in the case of general spherically symmetric black holes that have a \\emph{dynamical horizon}, as occurs in a cosmological context, one cannot have pair creation on the horizon because this violates energy conservation. This confirms the results obtained in other ways in a previous paper [25]. Looking at the expectation value of the quantum stress tensor with three different definitions of the vacuum state, we study the nature of particle creation and vacuum polarization in black hole and cosmological models, and the associated stress energy tensors. We show that the thermal tempera...

  5. ERRATUM DARCY SHEAR STRESS MICHEL LOUGE

    E-Print Network [OSTI]

    Lipson, Michal

    ERRATUM ­ DARCY SHEAR STRESS MICHEL LOUGE This document arises from a conversation with Renaud paper on sand ripples [1], we state "A consequence of equation (9) is that µ(1 - )[( v) + ( v)T ] 0. The viscous macroscopic Ergun's equation is (1) u = -(K/µ) p, where u (1 - )v is the superficial gas velocity

  6. Learning During Stressful Times Tracey J. Shors

    E-Print Network [OSTI]

    Shors, Tracey J.

    profound effects on our cognitive and motor abilities, from those that could be construed as adaptive be that stress impairs learning--or does it? In this review, I describe some basic trends in studies that have; Seligman and Maier 1967). Those that were exposed to the same amount of shock, but had control over it

  7. Using the stress response to monitor process control: pathways to more effective bioremediation

    E-Print Network [OSTI]

    Hazen, Terry C.

    2010-01-01T23:59:59.000Z

    of temperature elicit the heat shock stress response thathttp:vimss.lbl.gov). The heat shock stress response, havingstudies show that heat shock stress analysis can be applied

  8. Structural systems biology perspective on the metabolic impact of physicochemical stress

    E-Print Network [OSTI]

    Chang, Roger Larken

    2012-01-01T23:59:59.000Z

    to continuous osmotic and heat stresses. J Bacteriol. 190,cellular response to heat stress. Genes Dev. 20, 1776 (metabolic sensitivities to heat stress and providing new

  9. Environmental Stress and The Expression of Inbreeding Depression in Drosophila melanogaster

    E-Print Network [OSTI]

    Enders, Laramy Sherian

    2010-01-01T23:59:59.000Z

    Analysis of the Heat Stress Response in DrosophilaD. 2007. Complexity of the heat stress response in plants.analysis of the heat stress repsonse in Drosophila

  10. Coulomb stress accumulation along the San Andreas Fault system Bridget Smith and David Sandwell

    E-Print Network [OSTI]

    Smith-Konter, Bridget

    Coulomb stress accumulation along the San Andreas Fault system Bridget Smith and David Sandwell deformation, SCEC velocities, crustal stress Citation: Smith, B., and D. Sandwell, Coulomb stress accumulation

  11. Thru-thickness bending stress distribution at elevated temperatures

    E-Print Network [OSTI]

    Christian, Lee Conner

    2005-08-29T23:59:59.000Z

    the extreme fiber strains exceeded ten percent, which further adds to the increased risk of the flange plate cracking during fabrication. The highest residual stresses through the plate??s thickness occurred during cold bending. The residual stresses through...

  12. Advances in alleviating growth limitations of maize under salt stress

    E-Print Network [OSTI]

    Schubert, Sven

    2009-01-01T23:59:59.000Z

    during the first phase of salt stress. J. Appl. Bot. 2004;during the first phase of salt stress. J. Plant Nutr. SoilC, Hartung W, Schubert S. Salt resistance is determined by

  13. Grain Boundary Structure Effects on Intergranular Stress Corrosion Cracking of

    E-Print Network [OSTI]

    Olson, Tamara

    Grain Boundary Structure Effects on Intergranular Stress Corrosion Cracking of Alloy X­750 Y. Pan B­of­freedom) and correlations with intergranular stress corrosion cracking observed in Alloy X­750. Orientation imaging

  14. Interdependence of tetrapyrrole metabolism, the generation of oxidative stress and the mitigative oxidative stress response

    DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)

    Busch, Andrea W.U.; Montgomery, Beronda L.

    2015-04-01T23:59:59.000Z

    Tetrapyrroles are involved in light harvesting and light perception, electron-transfer reactions, and as co-factors for key enzymes and sensory proteins. Under conditions in which cells exhibit stress-induced imbalances of photosynthetic reactions, or light absorption exceeds the ability of the cell to use photoexcitation energy in synthesis reactions, redox imbalance can occur in photosynthetic cells. Such conditions can lead to the generation of reactive oxygen species (ROS) associated with alterations in tetrapyrrole homeostasis. ROS accumulation can result in cellular damage and detrimental effects on organismal fitness, or ROS molecules can serve as signals to induce a protective or damage-mitigating oxidative stressmore »signaling response in cells. Induced oxidative stress responses include tetrapyrrole-dependent and -independent mechanisms for mitigating ROS generation and/or accumulation. Thus, tetrapyrroles can be contributors to oxidative stress, but are also essential in the oxidative stress response to protect cells by contributing to detoxification of ROS. In this review, we highlight the interconnection and interdependence of tetrapyrrole metabolism with the occurrence of oxidative stress and protective oxidative stress signaling responses in photosynthetic organisms.« less

  15. Stress Evaluation and Model Validation Using Laser Ultrasonics

    SciTech Connect (OSTI)

    Dike, Jay J.; Lu, Wei-yang; Peng, Lawrence W.; Wang, James C. F.

    1999-02-01T23:59:59.000Z

    Rayleigh surface waves can be used to evaluate surface stresses and through-thickness stress gradients based on acoustoelasticity. Laser based ultrasonic techniques, which generate and detect surface waves, have the advantages of good spatial resolution and remote operation. The techniques have many potential applications. This is the final report of a LDRD project that is the first to exploit the benefits of laser ultrasonics for stress and stress gradient evaluation.

  16. The cardiokine story unfolds: ischemic stress-induced protein secretion

    E-Print Network [OSTI]

    Glembotski, Christopher

    on secreted proteins to mount a response designed to resist stress-induced damage. This review examines

  17. Beispiel 20 (Maxima der Exponentialverteilung) Sei (Xk) eine Folge von i.i.d. ZV mit Verteilungsfunktion F, F(x) =

    E-Print Network [OSTI]

    Dragoti-Ã?ela, Eranda

    Verteilungsfunktion F, F(x) = 1 - e-x f¨ur x 0. Zeigen Sie, dass F MDA() mit normierenden Konstanten an = 1 und bn Verteilungsfunktion F und Dich- tefunktion f, f(x) = ((1 + x2))-1 f¨ur x IR. Zeigen Sie, dass F MDA(1) mit (Charakterisierung von MDA(H)) · F MDA(H) mit > 0 F MDA() mit = 1/ > 0. · F MDA(H0) F MDA(). · F MDA(H) mit

  18. TECHNICAL ADVANCE Stress-induced changes in the Arabidopsis thaliana

    E-Print Network [OSTI]

    Weigel, Detlef

    used whole-genome tiling arrays to analyze the effects of salt, osmotic, cold and heat stress as well con- ditions such as heat, cold, high salinity or drought. These stress situations must triggerTECHNICAL ADVANCE Stress-induced changes in the Arabidopsis thaliana transcriptome analyzed using

  19. Welding residual stresses in ferritic power plant steels

    E-Print Network [OSTI]

    Cambridge, University of

    REVIEW Welding residual stresses in ferritic power plant steels J. A. Francis*1 , H. K. D. H require therefore, an accounting of residual stresses, which often are introduced during welding. To do in the estimation of welding residual stresses in austenitic stainless steels. The progress has been less convincing

  20. Method For Characterizing Residual Stress In Metals

    DOE Patents [OSTI]

    Jacobson, Loren A. (Santa Fe, NM); Michel, David J. (Alexandria, VA); Wyatt, Jeffrey R. (Burke, VA)

    2002-12-03T23:59:59.000Z

    A method is provided for measuring the residual stress in metals. The method includes the steps of drilling one or more holes in a metal workpiece to a preselected depth and mounting one or more acoustic sensors on the metal workpiece and connecting the sensors to an electronic detecting and recording device. A liquid metal capable of penetrating into the metal workpiece placed at the bottom of the hole or holes. A recording is made over a period of time (typically within about two hours) of the magnitude and number of noise events which occur as the liquid metal penetrates into the metal workpiece. The magnitude and number of noise events are then correlated to the internal stress in the region of the workpiece at the bottom of the hole.

  1. Entanglement entropy from the holographic stress tensor

    E-Print Network [OSTI]

    Arpan Bhattacharyya; Aninda Sinha

    2013-10-15T23:59:59.000Z

    We consider entanglement entropy in the context of gauge/gravity duality for conformal field theories in even dimensions. The holographic prescription due to Ryu and Takayanagi (RT) leads to an equation describing how the entangling surface extends into the bulk geometry. We show that setting to zero the time-time component of the Brown-York stress tensor evaluated on the co-dimension one entangling surface, leads to the same equation. By considering a spherical entangling surface as an example, we observe that Euclidean action methods in AdS/CFT will lead to the RT area functional arising as a counterterm needed to regularize the stress tensor. We present arguments leading to a justification for the minimal area prescription.

  2. Grading of lumber using stress waves

    E-Print Network [OSTI]

    Bethi, Rajeshwar

    1994-01-01T23:59:59.000Z

    of 2, 500 psi/min was used for all the tension tests, resulting in an average ume to failure of approximately 2 minutes. The section to follow presents an analysis of these experimental results. 40 CHAPTER IV ANALYSIS AND DISCUSSION MISCELLANEOUS... gravity and MOEs grouped by grade. Grade Sample Size Specifice Gravity Averageee Static Bending MOE (10' psi) Conjugate++e MOE (10 psi) Transverse Long Span Vibration MOE Bending MOE (10' psi) (10' psi) fmpact Stress Wave MOE (10 psi) 302...

  3. Method and apparatus for measuring stress

    DOE Patents [OSTI]

    Thompson, R. Bruce (Ames, IA)

    1985-06-11T23:59:59.000Z

    A method and apparatus for determining stress in a material independent of micro-structural variations and anisotropies. The method comprises comparing the velocities of two horizontally polarized and horizontally propagating ultrasonic shear waves with interchanged directions of propagation and polarization. The apparatus for carrying out the method comprises periodic permanent magnet-electromagnetic acoustic transducers for generating and detecting the shear waves and means for determining the wave velocities.

  4. On extended wind stress analyses for ENSO

    E-Print Network [OSTI]

    Wittenberg, Andrew

    , submitted to JC) ­ www.gfdl.noaa.gov/~atw/2005/cm2_tropac.pdf Zhang et al. (2005, submitted to MWR) ­ www.gfdl.noaa.gov/~atw/2005/ptwsupdt_cov.pdf Wittenberg (2004, J. Climate 17, 2526-2540) ­ www.gfdl.noaa.gov/~atw/2004/stress.pdf Wittenberg (2002, Ph.D. thesis) ­ www.gfdl.noaa.gov/~atw/research/thesis #12;Simulated annualmean climate #12

  5. Jim Crow's Legacy: Segregation Stress Syndrome

    E-Print Network [OSTI]

    Thompson-Miller, Ruth

    2012-07-16T23:59:59.000Z

    of Jim Crow. I systematically examine the long lasting psychological effects of racism, discrimination, stress, trauma through the narratives of those who experienced racial violence. I conceptualize racial violence broadly as collective and... mental health treatment. The history of racism, discrimination, and cultural mistrust are some of the keys to explaining why African Americans don?t seek help. The respondents reveal some of their recent experiences with extreme racism...

  6. PNNL Stress/Strain Correlation for Zircaloy

    SciTech Connect (OSTI)

    Geelhood, Kenneth J.; Beyer, Carl E.; Luscher, Walter G.

    2008-07-18T23:59:59.000Z

    Pacific Northwest National Laboratory (PNNL) was tasked with incorporating cladding mechanical property data into the Nuclear Regulatory Commission (NRC) fuel codes, FRAPCON-31 and FRAPTRAN2, by the NRC Office of Nuclear Reactor Research. The objective of that task was to create a mechanical model that can calculate true stress, true strain, and the possible failure of the fuel rod cladding based on uniaxial test data.

  7. Method and apparatus for measuring stress

    DOE Patents [OSTI]

    Thompson, R.B.

    1983-07-28T23:59:59.000Z

    A method and apparatus for determining stress in a material independent of micro-structural variations and anisotropies. The method comprises comparing the velocities of two horizontally polarized and horizontally propagating ultrasonic shear waves with interchanged directions of propagation and polarization. The apparatus for carrying out the method comprises periodic permanent magnet-electromagnetic acoustic transducers for generating and detecting the shear waves and means for determining the wave velocities.

  8. and oxidative stress in T lymphocytes Enhanced susceptibility of T lymphocytes to oxidative stress in the absence

    E-Print Network [OSTI]

    Boyer, Edmond

    stress in the absence of the cellular prion protein. Catherine Aude-Garcia a, b, c, * , Christian that in mice fed with a restricted diet, a regimen known to increase the intracellular level of ROS, Pr oxidative stress. Key words: cellular prion protein T Lymphocytes oxidative stress redox balance thymus hal

  9. Thin Silicon MEMS Contact-Stress Sensor

    SciTech Connect (OSTI)

    Kotovsky, J; Tooker, A; Horsley, D A

    2009-12-07T23:59:59.000Z

    This work offers the first, thin, MEMS contact-stress (CS) sensor capable of accurate in situ measruement of time-varying, contact-stress between two solid interfaces (e.g. in vivo cartilage contact-stress and body armor dynamic loading). This CS sensor is a silicon-based device with a load sensitive diaphragm. The diaphragm is doped to create piezoresistors arranged in a full Wheatstone bridge. The sensor is similar in performance to established silicon pressure sensors, but it is reliably produced to a thickness of 65 {micro}m. Unlike commercial devices or other research efforts, this CS sensor, including packaging, is extremely thin (< 150 {micro}m fully packaged) so that it can be unobtrusively placed between contacting structures. It is built from elastic, well-characterized materials, providing accurate and high-speed (50+ kHz) measurements over a potential embedded lifetime of decades. This work explored sensor designs for an interface load range of 0-2 MPa; however, the CS sensor has a flexible design architecture to measure a wide variety of interface load ranges.

  10. Novel finite-element approach applied to borehole quadrupole dispersion analysis in stress-sensitive formations

    E-Print Network [OSTI]

    Jorgensen, Ole

    Near a borehole, stress concentration effects may cause a complex spatial variation of elastic anisotropy. Stress-induced sonic anisotropy results when moduli and velocities are stress dependent and the state of stress is ...

  11. The determination of thru-thickness residual bending stresses

    E-Print Network [OSTI]

    Rinehart, Adam James

    2000-01-01T23:59:59.000Z

    by Bidirectional Bending for the Case y?, & y, , 110 5-1 Finite Elemenl, Mesh Used in Study 116 5-2 Comparison ol Percent Deviation of 100 and 200 Element. FE Models from Exact Solution, 800 k-in Released Moment, No Initial Stresses 123 5-3 Comparison of 200... Elcmcnt FE Solution to Exact Solution for Residual Stress Distribution Produced by 800 k-in Released Momem. in an Initially Stress Free Cross Section, . 124 5-4 Residual Stress Distributions for Increasing Levels of Released Moment, Initially Stress...

  12. Residual stresses in dielectrics caused by metallization lines and pads

    SciTech Connect (OSTI)

    He, M.Y.; Lipkin, J.; Clarke, D.R. [Univ. of California, Santa Barbara, CA (United States). Materials Dept.] [Univ. of California, Santa Barbara, CA (United States). Materials Dept.; Evans, A.G. [Harvard Univ., Cambridge, MA (United States). Div. of Applied Sciences] [Harvard Univ., Cambridge, MA (United States). Div. of Applied Sciences; Tenhover, M. [Carborundum Co., Niagara Falls, NY (United States)] [Carborundum Co., Niagara Falls, NY (United States)

    1996-06-01T23:59:59.000Z

    Residual stresses in dielectrics and semiconductors induced by metal lines, pads and vias can have detrimental effects on the performance of devices and electronic packages. Analytical and numerical calculations of these stresses have been performed for two purposes. (1) To illustrate how these stresses relate to the residual stress in the metallization and its geometry; (2) to calibrate a piezo-spectroscopic method for measuring these stresses with high spatial resolution. The results of the calculations have been presented using non-dimensional parameters that both facilitate scaling and provide connections to the stresses in the metal, with or without yielding. Preliminary experimental results obtained for Au/Ge eutectic pads illustrate the potential of the method and the role of the stress analysis.

  13. Molecular mechanisms of the plant heat stress response

    SciTech Connect (OSTI)

    Qu, Ai-Li; Ding, Yan-Fei; Jiang, Qiong [China Jiliang University, Xueyuan Road 258, Hangzhou 310018 (China)] [China Jiliang University, Xueyuan Road 258, Hangzhou 310018 (China); Zhu, Cheng, E-mail: pzhch@cjlu.edu.cn [China Jiliang University, Xueyuan Road 258, Hangzhou 310018 (China)] [China Jiliang University, Xueyuan Road 258, Hangzhou 310018 (China)

    2013-03-08T23:59:59.000Z

    Highlights: ? This review elaborates the response networks of heat stress in plants. ? It elaborates proteins responding to heat stress in special physiological period. ? The proteins and pathways have formed a basic network of the heat stress response. ? Achievements of the various technologies are also combined. -- Abstract: High temperature has become a global concern, which seriously affects the growth and production of plants, particularly crops. Thus, the molecular mechanism of the heat stress response and breeding of heat-tolerant plants is necessary to protect food production and ensure crop safety. This review elaborates on the response networks of heat stress in plants, including the Hsf and Hsp response pathways, the response of ROS and the network of the hormones. In addition, the production of heat stress response elements during particular physiological periods of the plant is described. We also discuss the existing problems and future prospects concerning the molecular mechanisms of the heat stress response in plants.

  14. Conservation of Modules but not Phenotype in Bacterial Response to Environmental Stress

    E-Print Network [OSTI]

    Timberlake, Sonia

    2010-01-01T23:59:59.000Z

    enterica and E. coli to heat stress. Pairs co-expressed inincluding heat and cold, hydrogen peroxide, osmotic stress,

  15. Simulating biofilm deformation and detachment with the immersed boundary method

    E-Print Network [OSTI]

    Sudarsan, Rangarajan; Stockie, John M; Eberl, Hermann J

    2015-01-01T23:59:59.000Z

    We apply the immersed boundary (or IB) method to simulate deformation and detachment of a periodic array of wall-bounded biofilm colonies in response to a linear shear flow. The biofilm material is represented as a network of Hookean springs that are placed along the edges of a triangulation of the biofilm region. The interfacial shear stress, lift and drag forces acting on the biofilm colony are computed by using fluid stress jump method developed by Williams, Fauci and Gaver [Disc. Contin. Dyn. Sys. B 11(2):519-540, 2009], with a modified version of their exclusion filter. Our detachment criterion is based on the novel concept of an averaged equivalent continuum stress tensor defined at each IB point in the biofilm which is then used to determine a corresponding von Mises yield stress; wherever this yield stress exceeds a given critical threshold the connections to that node are severed, thereby signalling the onset of a detachment event. In order to capture the deformation and detachment behaviour of a bio...

  16. Specific effects of cycling stressful temperatures upon phenotypic and genetic variability of size traits in

    E-Print Network [OSTI]

    Debat, Vincent

    of Drosophila melanogaster. We used either cold stress (daily cycle 8­25 C, average 16.5 C) or heat stress with cold stress but a decrease with heat stress. With respect to constant- temperature conditions, evolvability (genetic CV) was increased by daily cold stress, but decreased by daily heat stress. Within

  17. KKLAVIERABENDLAVIERABEND DER KLAVIERKLASSE VON

    E-Print Network [OSTI]

    Pfeifer, Holger

    zu 4 Händen D-Dur KV 381 Allegro, Andante, Allegro molto Karin Balser, Yukiko Imamichi Domenico) Sonate für Klavier und Violine, A-Dur Allegretto moderato ­ Allegro Barbara und Alexander Neubeck Franz

  18. Laserkhlung von Ionenkristallen Masterarbeit

    E-Print Network [OSTI]

    Blatt, Rainer

    laser light and trapped ions. There, the focus is on several possible laser cooling techniques properties of a new trap. The remaining parts deal with advanced techniques right up to ground state cooling of ground state cooling is presented which has the potential of achieving higher cooling rates and lower

  19. Agnes von Matuschka Grndungsservice

    E-Print Network [OSTI]

    Wichmann, Felix

    Spielklassiker wie UFO, Jagged Alliance, Incubation und Fallout. In ,,Götterdämmerung: Iron Dawn" kämpfen zwei

  20. Dynamic response of Cu4Zr54 metallic glass to high strain rate shock loading: plasticity, spall and atomic-level structures

    SciTech Connect (OSTI)

    Luo, Shengnian [Los Alamos National Laboratory; Arman, Bedri [Los Alamos National Laboratory; Germann, Timothy C [Los Alamos National Laboratory; Cagin, Tahir [TEXAS A& M UNIV

    2009-01-01T23:59:59.000Z

    We investigate dynamic response of Cu{sub 46}Zr{sub 54} metallic glass under adiabatic planar shock wave loading (one-dimensional strain) wjth molecular dynamics simulations, including Hugoniot (shock) states, shock-induced plasticity and spallation. The Hugoniot states are obtained up to 60 CPa along with the von Mises shear flow strengths, and the dynamic spall strength, at different strain rates and temperatures. The spall strengths likely represent the limiting values achievable in experiments such as laser ablation. For the steady shock states, a clear elastic-plastic transition is identified (e.g., in the shock velocity-particle velocity curve), and the shear strength shows strain-softening. However, the elastic-plastic transition across the shock front displays transient stress overshoot (hardening) above the Hugoniot elastic limit followed by a relatively sluggish relaxation to the steady shock state, and the plastic shock front steepens with increasing shock strength. The local von Mises shear strain analysis is used to characterize local deformation, and the Voronoi tessellation analysis, the corresponding short-range structures at various stages of shock, release, tension and spallation. The plasticity in this glass is manifested as localized shear transformation zones and of local structure rather than thermal origin, and void nucleation occurs preferentially at the highly shear-deformed regions. The Voronoi and shear strain analyses show that the atoms with different local structures are of different shear resistances that lead to shear localization (e.g., the atoms indexed with (0,0,12,0) are most shear-resistant, and those with (0,2,8,1) are highly prone to shear flow). The dynamic changes in local structures are consistent with the observed deformation dynamics.

  1. Sources of stress gradients in electrodeposited Ni MEMS.

    SciTech Connect (OSTI)

    Hearne, Sean Joseph; Floro, Jerrold Anthony; Dyck, Christopher William

    2004-06-01T23:59:59.000Z

    The ability of future integrated metal-semiconductor micro-systems such as RF MEMS to perform highly complex functions will depend on developing freestanding metal structures that offer improved conductivity and reflectivity over polysilicon structures. For example, metal-based RF MEMS technology could replace the bulky RF system presently used in communications, navigation, and avionics systems. However, stress gradients that induce warpage of active components have prevented the implementation of this technology. Figure 1, is an interference micrograph image of a series of cantilever beams fabricated from electrodeposited Ni. The curvature in the beams was the result of stress gradients intrinsic to the electrodeposition process. To study the sources of the stress in electrodeposition of Ni we have incorporated a wafer curvature based stress sensor, the multibeam optical stress sensor, into an electrodeposition cell. We have determined that there are two regions of stress induced by electrodepositing Ni from a sulfamate-based bath (Fig 2). The stress evolution during the first region, 0-1000{angstrom}, was determined to be dependent only on the substrate material (Au vs. Cu), whereas the stress evolution during the second region, >1000{angstrom}, was highly dependent on the deposition conditions. In this region, the stress varied from +0.5 GPa to -0.5GPa, depending solely on the deposition rate. We examined four likely sources for the compressive intrinsic stress, i.e. reduction in tensile stress, and determined that only the adatom diffusion into grain boundaries model of Sheldon, et al. could account for the observed compressive stress. In the presentation, we shall discuss the compressive stress generation mechanisms considered and the ramifications of these results on fabrication of electrodeposited Ni for MEMS applications.

  2. Category:Stress Test | Open Energy Information

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand JumpConceptual Model, click here. Category:ConceptualGeothermalInformationSolarall statesStress

  3. Assessment of the Mechanical Stress Improvement Process for Mitigating Primary Water Stress Corrosion Cracking in Nickel Alloy Butt Welds in Piping Systems Approved for Leak-Before-Break

    SciTech Connect (OSTI)

    Sullivan, Edmund J.; Anderson, Michael T.

    2013-01-01T23:59:59.000Z

    This report provides an assessment of the use of Mechanical Stress Improvement Process to reduce, or decrease, stress-driven degradation, i.e., primary water stress corrosion cracking.

  4. The effects of stress on nuclear power plant operational decision making and training approaches to reduce stress effects

    SciTech Connect (OSTI)

    Mumaw, R.J.

    1994-08-01T23:59:59.000Z

    Operational personnel may be exposed to significant levels of stress during unexpected changes in plant state an plant emergencies. The decision making that identifies operational actions, which is strongly determined by procedures, may be affected by stress, and performance may be impaired. ER report analyzes potential effects of stress in nuclear power plant (NPP) settings, especially in the context of severe accident management (SAM). First, potential sources of stress in the NPP setting are identified. This analysis is followed by a review of the ways in which stress is likely to affect performance, with an emphasis on performance of cognitive skills that are linked to operational decision making. Finally, potential training approaches for reducing or eliminating stress effects are identified. Several training approaches have the potential to eliminate or mitigate stress effects on cognitive skill performance. First, the use of simulated events for training can reduce the novelty and uncertainty that can lead to stress and performance impairments. Second, training to make cognitive processing more efficient and less reliant on attention and memory resources can offset the reductions in these resources that occur under stressful conditions. Third, training that targets crew communications skills can reduce the likelihood that communications will fail under stress.

  5. Stress enhanced diffusion of krypton ions in polycrystalline titanium

    SciTech Connect (OSTI)

    Nsengiyumva, S., E-mail: s.nsengiyumva@ru.ac.za [Department of Physics and Electronics, Rhodes University, Grahamstown 6140 (South Africa); Raji, A. T. [School of Interdisciplinary Research and Graduate Studies, University of South Africa, Mucklenuek Campus, P O Box 392, UNISA 0003, Pretoria (South Africa); Rivière, J. P. [Laboratoire de Métallurgie Physique, UMR 6630 CNRS- Université de Poitiers, Bd M. et P. Curie, BP30179, 86962 Chasseneuil Futuroscope, Cedex (France); Britton, D. T.; Härting, M. [NanoSciences Innovation Center, Department of Physics, University of Cape Town, Rondebosch 7701 (South Africa)

    2014-07-14T23:59:59.000Z

    An experimental investigation on the mutual influence of pre-existing residual stress and point defect following ion implantation is presented. The study has been carried out using polycrystalline titanium samples energetically implanted with krypton ions at different fluences. Ion beam analysis was used to determine the concentration profile of the injected krypton ions, while synchrotron X-ray diffraction has been used for stress determination. Ion beam analysis and synchrotron X-ray diffraction stress profile measurements of the implanted titanium samples show a clear evidence of stress-enhanced diffusion of krypton ions in titanium. It is further observed that for the titanium samples implanted at low fluence, ion implantation modifies the pre-existing residual stress through the introduction of point and open volume defects. The stress fields resulting from the ion implantation act to drift the krypton inclusions towards the surface of titanium.

  6. Stress-Assisted Corrosion in Boiler Tubes

    SciTech Connect (OSTI)

    Preet M Singh; Steven J Pawel

    2006-05-27T23:59:59.000Z

    A number of industrial boilers, including in the pulp and paper industry, needed to replace their lower furnace tubes or decommission many recovery boilers due to stress-assisted corrosion (SAC) on the waterside of boiler tubes. More than half of the power and recovery boilers that have been inspected reveal SAC damage, which portends significant energy and economic impacts. The goal of this project was to clarify the mechanism of stress-assisted corrosion (SAC) of boiler tubes for the purpose of determining key parameters in its mitigation and control. To accomplish this in-situ strain measurements on boiler tubes were made. Boiler water environment was simulated in the laboratory and effects of water chemistry on SAC initiation and growth were evaluated in terms of industrial operations. Results from this project have shown that the dissolved oxygen is single most important factor in SAC initiation on carbon steel samples. Control of dissolved oxygen can be used to mitigate SAC in industrial boilers. Results have also shown that sharp corrosion fatigue and bulbous SAC cracks have similar mechanism but the morphology is different due to availability of oxygen during boiler shutdown conditions. Results are described in the final technical report.

  7. An investigation of residual stress in welded joints

    E-Print Network [OSTI]

    Moffat, William Hugh

    1951-01-01T23:59:59.000Z

    . flummery and Conclusions VII. '-. &uggested Procedure for I"uture Investigation 18 o i' VIII. ? . Ppendix IX. Bibliography LIST OP EIGURES Ro. Title Page 1. 'welded Plates snd Gptical Gage Used by Soulton and Martin ~ ~ 6 2. Dr. Rao~s Method... AN INVESTIGATION OF RESIDUAL STRESS IN WELDED JOINTS INTRODUCTION The object of the research reported in this paper was to investigate the magnitude of transverse and longi- tudial residual stress in a welded Joint. These are the stresses in a direction...

  8. An investigation of residual stress in welded joints 

    E-Print Network [OSTI]

    Moffat, William Hugh

    1951-01-01T23:59:59.000Z

    . flummery and Conclusions VII. '-. &uggested Procedure for I"uture Investigation 18 o i' VIII. ? . Ppendix IX. Bibliography LIST OP EIGURES Ro. Title Page 1. 'welded Plates snd Gptical Gage Used by Soulton and Martin ~ ~ 6 2. Dr. Rao~s Method... AN INVESTIGATION OF RESIDUAL STRESS IN WELDED JOINTS INTRODUCTION The object of the research reported in this paper was to investigate the magnitude of transverse and longi- tudial residual stress in a welded Joint. These are the stresses in a direction...

  9. Ultrasonic detection of residual stress in a turbine disk 

    E-Print Network [OSTI]

    Pathak, Nitin

    1992-01-01T23:59:59.000Z

    in temperature and stresses during welding. Adapted from [4] . . Cracked steam turbine rotor disk segments. Adapted from [6] . . . . 5 Electrical block diagram of Barkhausen apparatus. Adapted from [11] 10 Snell's Law. 15 Stress field and speeds of plane... International B. Effects in Engineering Design Residual stresses may be introduced into materials in a variety of ways, e. g. , in manu- facturing and repairing processes such as casting, machining, or welding. The casting process has a high probability...

  10. acute thermal stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    induces a reduction of the effective mean stress and can lead to shear failure or hydraulic fracturing. The equations governing the phenomenon of thermal pressurization are...

  11. adenosine triphosphate stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    though no flow is present. The macroscopic stress evolution is connected to a length scale of residual liquefaction displayed by microscopic mean-squared displacements. The...

  12. adenosine stress tl-201: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    though no flow is present. The macroscopic stress evolution is connected to a length scale of residual liquefaction displayed by microscopic mean-squared displacements. The...

  13. anaerobiosis acid stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    though no flow is present. The macroscopic stress evolution is connected to a length scale of residual liquefaction displayed by microscopic mean-squared displacements. The...

  14. adenosine stress echocardiography: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    though no flow is present. The macroscopic stress evolution is connected to a length scale of residual liquefaction displayed by microscopic mean-squared displacements. The...

  15. akuten psychischen stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    though no flow is present. The macroscopic stress evolution is connected to a length scale of residual liquefaction displayed by microscopic mean-squared displacements. The...

  16. Controlling anomalous stresses in soft field-responsive systems

    E-Print Network [OSTI]

    D. Reguera; J. M. Rubí; A. Pérez-Madrid

    2000-03-02T23:59:59.000Z

    We report a new phenomenon occurring in field-responsive suspensions: shear-induced anomalous stresses. Competition between a rotating field and a shear flow originates a multiplicity of anomalous stress behaviors in suspensions of bounded dimers constituted by induced dipoles. The great variety of stress regimes includes non-monotonous behaviors, multi-resonances, negative viscosity effect and blockades. The reversibility of the transitions between the different regimes and the self-similarity of the stresses make this phenomenon controllable and therefore applicable to modify macroscopic properties of soft condensed matter phases

  17. Accumulating Neighborhood Stress Exposure: Effects on Hypertension, Obesity, and Depression

    E-Print Network [OSTI]

    Jones, Fay Malia

    2012-01-01T23:59:59.000Z

    expectancy consequences of hypertension. J Hypertens, 16(8),social disparities in hypertension prevalence, awareness,psychosocial stress cause hypertension? A systematic review

  18. anisotropic stress conditions: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    of scalar anisotropic stress in cosmological solutions and a modification in the propagation of gravitational waves. If these phenomena are present, they are both active...

  19. Surge Nozzle NDE Specimen Mechanical Stress Improvement Analysis

    SciTech Connect (OSTI)

    Fredette, Lee F.

    2011-07-14T23:59:59.000Z

    The purpose of this project was to perform a finite element analysis of a pressurized water reactor pressurizer surge nozzle mock-up to predict both the weld residual stresses created in its construction and the final stress state after the application of the Mechanical Stress Improvement Process (MSIP). Strain gages were applied to the inner diameter of the mock-up to record strain changes during the MSIP. These strain readings were used in an attempt to calculate the final stress state of the mock-up as well.

  20. Modeling of grain boundary stresses in Alloy 600

    SciTech Connect (OSTI)

    Kozaczek, K.J. [Oak Ridge National Lab., TN (United States); Sinharoy, A.; Ruud, C.O. [Pennsylvania State Univ., University Park, PA (United States); Mcllree, A.R. [Electric Power Research Inst., Palo Alto, CA (United States)

    1995-04-01T23:59:59.000Z

    Corrosive environments combined with high stress levels and susceptible microstructures can cause intergranular stress corrosion cracking (IGSCC) of Alloy 600 components on both primary and secondary sides of pressurized water reactors. One factor affecting the IGSCC is intergranular carbide precipitation controlled by heat treatment of Alloy 600. This study is concerned with analysis of elastic stress fields in vicinity of M{sub 7}C{sub 3} and M{sub 23}C{sub 6} carbides precipitated in the matrix and at a grain boundary triple point. The local stress concentration which can lead to IGSCC initiation was studied using a two-dimensional finite element model. The intergranular precipitates are more effective stress raisers than the intragranular precipitates. The combination of the elastic property mismatch and the precipitate shape can result in a local stress field substantially different than the macroscopic stress. The maximum local stresses in the vicinity of the intergranular precipitate were almost twice as high as the applied stress.

  1. Membrane degradation Accelerated Stress Test | OSTI, US Dept...

    Office of Scientific and Technical Information (OSTI)

    Membrane degradation Accelerated Stress Test Re-direct Destination: Abstract Not Provided times redirected to final destination ShortURL Code Published Current state Most recent...

  2. DOE Cell Component Accelerated Stress Test Protocols for PEM...

    Broader source: Energy.gov (indexed) [DOE]

    CELL COMPONENT ACCELERATED STRESS TEST PROTOCOLS FOR PEM FUEL CELLS (Electrocatalysts, Supports, Membranes, and Membrane Electrode Assemblies) March 2007 Fuel cells, especially for...

  3. Cell Component Accelerated Stress Test Protocols for PEM Fuel...

    Broader source: Energy.gov (indexed) [DOE]

    USCAR FUEL CELL TECH TEAM CELL COMPONENT ACCELERATED STRESS TEST PROTOCOLS FOR PEM FUEL CELLS (Electrocatalysts, Supports, Membranes, and Membrane Electrode Assemblies) Revised May...

  4. abiotic stress tolerance: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    abiotic stress and development Biology and Medicine Websites Summary: Miguel Angel Torres1 and Jeffery L Dangl1,2 The production of reactive oxygen intermediates (ROI...

  5. Three dimensional stress vector sensor array and method therefor

    DOE Patents [OSTI]

    Pfeifer, Kent Bryant; Rudnick, Thomas Jeffery

    2005-07-05T23:59:59.000Z

    A sensor array is configured based upon capacitive sensor techniques to measure stresses at various positions in a sheet simultaneously and allow a stress map to be obtained in near real-time. The device consists of single capacitive elements applied in a one or two dimensional array to measure the distribution of stresses across a mat surface in real-time as a function of position for manufacturing and test applications. In-plane and normal stresses in rolling bodies such as tires may thus be monitored.

  6. ataxia oxidative stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    levels (420 mgdl) was observed in 19% (n59) of mallards (Anas Green, Andy J. 73 Acrolein induces oxidative stress in brain mitochondria Jian Luo, Riyi Shi* Engineering...

  7. alleviates oxidative stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    levels (420 mgdl) was observed in 19% (n59) of mallards (Anas Green, Andy J. 74 Acrolein induces oxidative stress in brain mitochondria Jian Luo, Riyi Shi* Engineering...

  8. activity oxidative stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    levels (420 mgdl) was observed in 19% (n59) of mallards (Anas Green, Andy J. 88 Acrolein induces oxidative stress in brain mitochondria Jian Luo, Riyi Shi* Engineering...

  9. attenuates oxidative stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    levels (420 mgdl) was observed in 19% (n59) of mallards (Anas Green, Andy J. 73 Acrolein induces oxidative stress in brain mitochondria Jian Luo, Riyi Shi* Engineering...

  10. attenuate oxidative stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    levels (420 mgdl) was observed in 19% (n59) of mallards (Anas Green, Andy J. 73 Acrolein induces oxidative stress in brain mitochondria Jian Luo, Riyi Shi* Engineering...

  11. angiogenesis oxidative stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    levels (420 mgdl) was observed in 19% (n59) of mallards (Anas Green, Andy J. 72 Acrolein induces oxidative stress in brain mitochondria Jian Luo, Riyi Shi* Engineering...

  12. attenuating oxidative stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    levels (420 mgdl) was observed in 19% (n59) of mallards (Anas Green, Andy J. 73 Acrolein induces oxidative stress in brain mitochondria Jian Luo, Riyi Shi* Engineering...

  13. alter oxidative stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    levels (420 mgdl) was observed in 19% (n59) of mallards (Anas Green, Andy J. 87 Acrolein induces oxidative stress in brain mitochondria Jian Luo, Riyi Shi* Engineering...

  14. acute oxidative stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    levels (420 mgdl) was observed in 19% (n59) of mallards (Anas Green, Andy J. 83 Acrolein induces oxidative stress in brain mitochondria Jian Luo, Riyi Shi* Engineering...

  15. apoptotic oxidative stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    levels (420 mgdl) was observed in 19% (n59) of mallards (Anas Green, Andy J. 70 Acrolein induces oxidative stress in brain mitochondria Jian Luo, Riyi Shi* Engineering...

  16. P wave anisotropy, stress, and crack distribution at Coso geothermal...

    Open Energy Info (EERE)

    Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: P wave anisotropy, stress, and crack distribution at Coso geothermal field, California...

  17. acute heat stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Olivier Chastel; Juan F. Masello 62 The Influence of Osmoreceptors and Baroreceptors on Heat Loss Responses during a Whole-body Passive Heat Stress . Open Access Theses and...

  18. Tensile-stressed microelectromechanical apparatus and micromirrors formed therefrom

    DOE Patents [OSTI]

    Fleming, James G. (Albuquerque, NM)

    2006-05-16T23:59:59.000Z

    A microelectromechanical (MEM) apparatus is disclosed which includes one or more tensile-stressed actuators that are coupled through flexures to a stage on a substrate. The tensile-stressed actuators, which can be formed from tensile-stressed tungsten or silicon nitride, initially raise the stage above the substrate without any applied electrical voltage, and can then be used to control the height or tilt angle of the stage. An electrostatic actuator can also be used in combination with each tensile-stressed actuator. The MEM apparatus has applications for forming piston micromirrors or tiltable micromirrors and independently addressable arrays of such devices.

  19. Salt Stress in Desulfovibrio vulgaris Hildenborough: An integrated genomics approach

    E-Print Network [OSTI]

    Mukhopadhyay, Aindrila

    2010-01-01T23:59:59.000Z

    machinery against salt-induced damage in Synechococcus.Lactobacillus plantarum to salt and nonelectrolyte stress. Jregulation of acid, heat, and salt tolerance in Escherichia

  20. Measuring depth profiles of residual stress with Raman spectroscopy

    SciTech Connect (OSTI)

    Enloe, W.S.; Sparks, R.G.; Paesler, M.A.

    1988-12-01T23:59:59.000Z

    Knowledge of the variation of residual stress is a very important factor in understanding the properties of machined surfaces. The nature of the residual stress can determine a part`s susceptibility to wear deformation, and cracking. Raman spectroscopy is known to be a very useful technique for measuring residual stress in many materials. These measurements are routinely made with a lateral resolution of 1{mu}m and an accuracy of 0.1 kbar. The variation of stress with depth; however, has not received much attention in the past. A novel technique has been developed that allows quantitative measurement of the variation of the residual stress with depth with an accuracy of 10nm in the z direction. Qualitative techniques for determining whether the stress is varying with depth are presented. It is also demonstrated that when the stress is changing over the volume sampled, errors can be introduced if the variation of the stress with depth is ignored. Computer aided data analysis is used to determine the depth dependence of the residual stress.

  1. Stresses in thermally grown alumina scales near edges and corners.

    SciTech Connect (OSTI)

    Grimsditch, M.

    1998-06-03T23:59:59.000Z

    We have investigated the residual stress near edges and corners of thermally grown alumina scales. Micro-fluorescence measurements, performed on alloys with composition Fe-5Cr-28Al (at.%, bal. Fe) oxidized at 900 C, showed a large (>50%) reduction in hydrostatic stress in the vicinity of edges and corners. Surprisingly, stress relaxation persists out to distances ten times the scale thickness from the edge. Finite element analysis calculations confirm the experimental results and provide a considerably more detailed picture of the stress distribution and its components.

  2. Failure Stress and Apparent Elastic Modulus of Diesel Particulate...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    test specimen geometries and test methods for brittle materials are adapted to DPF architecture to evaluate failure initiation stress and apparent elastic modulus of the ceramics....

  3. Residual Stresses for Structural Analysis and Fatigue Life Prediction...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Stresses for Structural Analysis and Fatigue Life Prediction in Vehicle Components: Success stories from the High Temperature Materials Laboratory (HTML) User Program Residual...

  4. Thermal Stress and Reliability for Advanced Power Electronics...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    Performance and Reliability of Bonded Interfaces Physics of Failure of Electrical Interconnects Thermal Stress and Reliability for Advanced Power Electronics and Electric Machines...

  5. Thermal Stress and Reliability for Advanced Power Electronics...

    Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

    More Documents & Publications Thermal Stress and Reliability for Advanced Power Electronics and Electric Machines Power Electronic Thermal System Performance and Integration...

  6. Stresses in adhesive joints due to moisture sorption 

    E-Print Network [OSTI]

    Jen, Ming-Hwa Robert

    1980-01-01T23:59:59.000Z

    for the Case of 2 Moisture Absorpt1on. . . . . . . . . . . . . . . . . . 53 The Non-Dimensional Peel Stress p and the Interlaminar Shear Stresses T and T vs. the Non-Dimensional D1stance x for the Case of Moi stfre Absorption . . . . . . . . . 54 The Non...-Dimensional Displacement W2 of the Outer-Adherends vs. the Non-Dimens1onal Distance x for the Case of Moisture Desorption . . . . . . . . . . . . . . . . . . 55 The Non-Dimensional Peel Stress p and the Interlaminar Shear Stresses T and T2 vs. the Non-D1mens1onal...

  7. ameliorates oxidative stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Ambient Air Pollution is Associated with Increased Exhaled Nitric Oxide in Children with Asthma University of California eScholarship Repository Summary: oxidative stress in...

  8. Structure, tectonics and stress field of the Coso Range, Inyo...

    Open Energy Info (EERE)

    County, California Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: Structure, tectonics and stress field of the Coso Range, Inyo County,...

  9. The John von Neumann Institute for Computing (NIC): A survey of its supercomputer facilities and its Europe-wide computational science activities

    E-Print Network [OSTI]

    N. Attig

    2005-12-12T23:59:59.000Z

    The John von Neumann Institute for Computing (NIC) at the Research Centre Juelich, Germany, is one of the leading supercomputing centres in Europe. Founded as a national centre in the mid-eighties it now provides more and more resources to European scientists. This happens within EU-funded projects (I3HP, DEISA) or Europe-wide scientific collaborations. Beyond these activities NIC started an initiative towards the new EU member states in summer 2004. Outstanding research groups are offered to exploit the supercomputers at NIC to accelerate their investigations on leading-edge technology. The article gives an overview of the organisational structure of NIC, its current supercomputer systems, and its user support. Transnational Access (TA) within I3HP is described as well as access by the initiative for new EU member states. The volume of these offers and the procedure of how to apply for supercomputer resources is introduced in detail.

  10. Adjustable shear stress erosion and transport flume

    DOE Patents [OSTI]

    Roberts, Jesse D. (Carlsbad, NM); Jepsen, Richard A. (Carlsbad, NM)

    2002-01-01T23:59:59.000Z

    A method and apparatus for measuring the total erosion rate and downstream transport of suspended and bedload sediments using an adjustable shear stress erosion and transport (ASSET) flume with a variable-depth sediment core sample. Water is forced past a variable-depth sediment core sample in a closed channel, eroding sediments, and introducing suspended and bedload sediments into the flow stream. The core sample is continuously pushed into the flow stream, while keeping the surface level with the bottom of the channel. Eroded bedload sediments are transported downstream and then gravitationally separated from the flow stream into one or more quiescent traps. The captured bedload sediments (particles and aggregates) are weighed and compared to the total mass of sediment eroded, and also to the concentration of sediments suspended in the flow stream.

  11. Geonics EM31 ISTerre Dernire mise jour : 19 mars 2012

    E-Print Network [OSTI]

    to BA TT position. 2. If meter reads above ±4.4 then batteries are in good condition (C size) Initial #12;Using the Geonics EM31 Battery Check 1. Set MODE switch to OPER position and rotate RANGE switch for this test is ±1 mS/s. To adjust reading use the DC ZERO CONTROL, located under front panel. Remove battery

  12. au lhc mise: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Summary: The Standard Model of particle physics predicts the existence of the Higgs boson, which preferentially decays to b quark pairs at low mass. The identification of...

  13. Liste complte des publications: (Mise jour: Sept 2013)

    E-Print Network [OSTI]

    Madeleine, Jean-Baptiste

    Projections. in Regional Assessment of Climate Change in the Mediterranean (Eds. A. Navarra, L. Tubiana weather regimes over the Mediterranean region: their role for the regional climate and projected changes. Marcomini, 2013: An ensemble of models for identifying climate change scenarios in the Gulf of Gabes

  14. Characterization of Optical Fiber Strength Under Applied Tensile Stress and Bending Stress

    SciTech Connect (OSTI)

    P.E. Klingsporn

    2011-08-01T23:59:59.000Z

    Various types of tensile testing and bend radius tests were conducted on silica core/silica cladding optical fiber of different diameters with different protective buffer coatings, fabricated by different fiber manufacturers. The tensile tests were conducted to determine not only the average fiber strengths at failure, but also the distribution in fracture strengths, as well as the influence of buffer coating on fracture strength. The times-to-failure of fiber subjected to constant applied bending stresses of various magnitudes were measured to provide a database from which failure times of 20 years or more, and the corresponding minimum bend radius, could be extrapolated in a statistically meaningful way. The overall study was done to provide an understanding of optical fiber strength in tensile loading and in applied bending stress as related to applications of optical fiber in various potential coizfgurations for weapons and enhanced surveillance campaigns.

  15. RESIDUAL STRESS EFFECTS IN FRACTURE OF COMPOSITES AND ADHESIVES

    E-Print Network [OSTI]

    Nairn, John A.

    RESIDUAL STRESS EFFECTS IN FRACTURE OF COMPOSITES AND ADHESIVES JOHN A. NAIRN ABSTRACT Because composites and adhesive joints are made from different phases with different thermal expansion coefficients, they inevitably develop residual thermal stresses. When designing composites or adhesive joints, it is important

  16. Effect of Intermediate Principal Stress on Overconsolidated Kaolin Clay

    E-Print Network [OSTI]

    Prashant, Amit

    Effect of Intermediate Principal Stress on Overconsolidated Kaolin Clay Amit Prashant1 and Dayakar of overconsolidated kaolin clay is investigated using three-dimensional true triaxial testing on cubical specimens specimens under stress and strain-control modes. Undrained tests on kaolin clay show that the following vary

  17. Ultrasonic detection of residual stress in a turbine disk

    E-Print Network [OSTI]

    Pathak, Nitin

    1992-01-01T23:59:59.000Z

    technique measured stresses within one standard deviation of 5000 psi. Further, the technique showed that in the as-received condstion stresses in the narrow and broad sides of the turbine disk rim were above 5500 psi tensile and above 20, 000 psi...

  18. Finding Stress Patterns in Microprocessor Workloads Frederik Vandeputte Lieven Eeckhout

    E-Print Network [OSTI]

    Eeckhout, Lieven

    Finding Stress Patterns in Microprocessor Workloads Frederik Vandeputte Lieven Eeckhout Department-end embedded systems to high-end supercom- puters. Understanding the power characteristics of a microprocessor) that stress the microprocessor to its extreme power con- sumption. This paper closes the gap between these two

  19. Minimization of welding residual stress and distortion in large structures

    E-Print Network [OSTI]

    Michaleris, Panagiotis

    1 Minimization of welding residual stress and distortion in large structures P. Michaleris at Champaign Urbana, Urbana, IL Abstract Welding distortion in large structures is usually caused by buckling due to the residual stress. In cases where the design is fixed and minimum weld size requirements

  20. Contact Stress in Hips with Osteonecrosis of the Femoral Head

    E-Print Network [OSTI]

    Iglic, Ales

    Contact Stress in Hips with Osteonecrosis of the Femoral Head Matej Daniel, PhD*; Srecko Herman, MD by elevated con- tact stress. Osteonecrosis of the femoral head is a relatively common disorder of the human of the hip are af- fected by osteonecrosis of the femoral head,8 they have been the subject of numerous

  1. 2006 Nature Publishing Group Transgeneration memory of stress in plants

    E-Print Network [OSTI]

    Mayfield, John

    © 2006 Nature Publishing Group Transgeneration memory of stress in plants Jean Molinier1 , Gerhard Ries1 , Cyril Zipfel1 & Barbara Hohn1 Owing to their sessile nature, plants are constantly exposed to a multitude of environmental stresses to which they react with a battery of responses. The result is plant

  2. A COUPLED HYDRAULIC AND ELECTRICAL STRESS DETERMINATION TECHNIQUE

    E-Print Network [OSTI]

    A COUPLED HYDRAULIC AND ELECTRICAL STRESS DETERMINATION TECHNIQUE Mai Linh DOAN Département de Alps. The Hydraulic Tests on Preexisting Fractures (HTPF) method was chosen for it provides means to determine the complete stress tensor. The campaign was performed with a specific probe, coupling hydraulic

  3. FORMATION GESTION DU STRESS CONTEXTE, PUBLIC, FINALITE DE LA FORMATION

    E-Print Network [OSTI]

    Brest, Université de

    FORMATION GESTION DU STRESS CONTEXTE, PUBLIC, FINALITE DE LA FORMATION La vie moderne et le stress : mettre en place des stratégies de gestion , étudier quelques aspects essentiels de la et cas cliniques composés par les participants ou fournis par le formateur . - Jeux de rôle en sous

  4. Stress-enhanced swelling of metal during irradiation

    SciTech Connect (OSTI)

    Garner, F.A.; Gilbert, E.R.; Porter, D.L.

    1980-04-01T23:59:59.000Z

    Data are available which show that stress plays a major role in the development of radiation-induced void growth in AISI 316 and many other alloys. Earlier experiments came to the opposite conclusion and are shown to have investigated stress levels which inadvertantly cold-worked the material. Stress-affected swelling spans the entire temperature range in fast reactor irradiations and accelerates with increasing irradiatin temperature. It also appears to operate in all alloy starting conditions investigated. Two major microstructural mechanisms appear to be causing the enhancement of swelling, which for tensile stresses is manifested primarily as a decrease in the incubation period. These mechanisms are stress-induced changes in the interstitial capture efficiency of voids and stress-induced changes in the vacancy emission rate of various microstructural components. There also appears to be an enhancement of intermetallic phase formation with applied stress and this is shown to increase swelling by accelerating the microchemical evolution that precedes void growth at high temperature. This latter consideration complicates the extrapolation of these data to compressive stress states.

  5. -Glutamyl transferase deficiency results in lung oxidant stress in normoxia

    E-Print Network [OSTI]

    Marc, Robert E.

    -Glutamyl transferase deficiency results in lung oxidant stress in normoxia JYH CHANG JEAN,1 YUE E. Marc, Elizabeth Klings, and Martin Joyce-Brady. -Glutamyl transferase deficiency results in lung oxidant stress in normoxia. Am J Physiol Lung Cell Mol Physiol 283: L766­L776, 2002. First published May 3

  6. Uniaxially stressed Ge:Ga and Ge:Be

    SciTech Connect (OSTI)

    Dubon, O.D. Jr.

    1992-12-01T23:59:59.000Z

    The application of a large uniaxial stress to p-type Ge single crystals changes the character of both the valence band and the energy levels associated with the acceptors. Changes include the splitting of the fourfold degeneracy of the valence band top and the reduction of the ionization energy of shallow acceptors. In order to study the effect of uniaxial stress on transport properties of photoexcited holes, a variable temperature photo-Hall effect system was built in which stressed Ge:Ga and Ge:Be could be characterized. Results indicate that stress increases the lifetime and Hall mobility of photoexcited holes. These observations may help further the understanding of fundamental physical processes that affect the performance of stressed Ge photoconductors including the capture of holes by shallow acceptors.

  7. Mining problems caused by tectonic stress in Illinois basin

    SciTech Connect (OSTI)

    Nelson, W.J. (Illinois State Geological Survey, Champaign (United States))

    1991-08-01T23:59:59.000Z

    The Illinois basin coalfield is subject to a contemporary tectonic stress field in which the principal compressive stress axis ({sigma}1) is horizontal and strikes N60{degree}E to east-west. This stress is responsible for widespread development of kind zones and directional roof failures in mine headings driven perpendicular to {sigma}1. Also, small thrust faults perpendicular to {sigma}1 and joints parallel to {sigma}1 weaken the mine roof and occasionally admit water and gas to workings, depending upon geologic setting. The direction of magnitude of stress have been identified by a variety of techniques that can be applied both prior to mining and during development. Mining experience shows that the best method of minimizing stress-related problems is to drive mine headings at about 45 to {sigma}1.

  8. Critical Incident Stress Management (CISM): Group Crisis Intervention, 4th June 2006, International Critical Incident Stress Foundation, Inc.

    E-Print Network [OSTI]

    Oliver, Douglas L.

    Critical Incident Stress Management (CISM): Group Crisis Intervention, 4th Edition, June 2006 chest pain headaches elevated bp rapid heart rate muscle tremors shock symptoms grinding of teeth visual Management (CISM): Group Crisis Intervention, 4th Edition, June 2006, International Critical Incident Stress

  9. Classification of Rice (Oryza sativa L. japonica Nipponbare) Immunophilins (FKBPs, CYPs) and Expression Patterns under Water Stress

    E-Print Network [OSTI]

    2010-01-01T23:59:59.000Z

    during exposure to heat stress, whereas it was localized inexpression was induced by heat stress and developmentallyin the nucleus during heat stress [19]. The expression of

  10. Does jasmonic acid control the maize shoot growth during the first phase of salt stress?

    E-Print Network [OSTI]

    Shahzad, Ahmad Naeem; Pollmann, Stephan; Schubert, Sven

    2009-01-01T23:59:59.000Z

    Introduction Salt stress affects plant growth in twohormones, pH) in response to salt/drought stress is notin response to osmotic/salt stress (Creelman and Mullet

  11. Tentative topics for oral examination "Introduc-tion to Extreme Value Theory", January 23 and

    E-Print Network [OSTI]

    Mikosch, Thomas

    Characterizations of F MDA(H) and their normalizing and centering constants. Examples of distributions in the different MDAs. Show that von Mises functions are in MDA(). Ex- istence of moments in MDA() and in MDA(). 4 (Theorem 3.4.5, equivalence between (a) and (b)) result in the case MDA(). 5. Order statistics

  12. Macroscopic yield criteria for plastic anisotropic materials containing spheroidal

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Macroscopic yield criteria for plastic anisotropic materials containing spheroidal voids Vincent-Leblond-Devaux's (GLD) analysis of an rigid-ideal plastic (von Mises) spheroidal volume containing a confocal spheroidal of the proposed approximate yield criterion for plastic anisotropic media containing non-spherical voids

  13. A CAVITATION TRACKING METHOD FOR ELASTIC-PLASTIC FLOW IN SOLIDS

    E-Print Network [OSTI]

    Shyue, Keh-Ming

    A CAVITATION TRACKING METHOD FOR ELASTIC-PLASTIC FLOW IN SOLIDS Keh-Ming Shyue Department with cavitation. The algorithm uses a simplified model system where the behavior of the materials is modeled, and the von Mises condition for the elastic-plastic phase change. To characterize the cavitation

  14. Integrity assessment of the ferritic / austenitic dissimilar weld joint between intermediate heat exchanger and steam generator in fast reactor

    SciTech Connect (OSTI)

    Jayakumar, T.; Laha, K.; Chandravathi, K. S.; Parameswaran, P.; Goyal, S.; Kumar, J. G.; Mathew, M. D. [Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam- 603 102 (India)

    2012-07-01T23:59:59.000Z

    Integrity of the modified 9Cr-1Mo / alloy 800 dissimilar joint welded with Inconel 182 electrodes has been assessed under creep condition based on the detailed analysis of microstructure and stress distribution across the joint by finite element analysis. A hardness peak at the ferritic / austenitic weld interface and a hardness trough at the inter-critical heat affected zone (HAZ) in ferritic base metal developed. Un-tempered martensite was found at the ferritic / austenitic weld interface to impart high hardness in it; whereas annealing of martensitic structure of modified 9Cr-1Mo steel by inter-critical heating during welding thermal cycle resulted in hardness tough in the inter-critical HAZ. Creep tests were carried out on the joint and ferritic steel base metal at 823 K over a stress range of 160-320 MPa. The joint possessed lower creep rupture strength than its ferritic steel base metal. Failure of the joint at relatively lower stresses occurred at the ferritic / austenitic weld interface; whereas it occurred at inter-critical region of HAZ at moderate stresses. Cavity nucleation associated with the weld interface particles led to premature failure of the joint. Finite element analysis of stress distribution across the weld joint considering the micro-mechanical strength inhomogeneity across it revealed higher von-Mises and principal stresses at the weld interface. These stresses induced preferential creep cavitation at the weld interface. Role of precipitate in enhancing creep cavitation at the weld interface has been elucidated based on the FE analysis of stress distribution across it. (authors)

  15. AN UPDATE ON BIAXIAL THERMAL CREEP OF VANADIUM ALLOYS

    SciTech Connect (OSTI)

    Kurtz, Richard J.; Ermi, August M.

    2002-09-01T23:59:59.000Z

    A study of the thermal creep properties of two vanadium alloys was performed using pressurized tube specimens. Creep tubes nominally 4.57 mm OD by 0.25 mm wall thickness were pressurized with high-purity helium gas to mid-wall effective stresses below the effective (Von Mises) yield strength. Specimens were fabricated from V-4Cr-4Ti (Heat No. 832665) and a V-3Fe-4Ti alloy. The samples were heated to 650, 700, 725, and 800 degrees C in an ultra-high vacuum furnace and periodically removed to measure the change in tube outer diameter with a high-precision laser profilometer. The normalized minimum creep rate was found to be power-law dependent on the modulus compensated applied stress. The value of the stress exponent varied with the applied stress. At normalized stresses ranging from 0.002 to 0.008 the stress exponent was about 4 and the activation energy was about 300 kJ/mole, which is quite close to the activation energy for self-diffusion in pure vanadium. These results suggest that the predominant mechanism of creep in this regime is climb-assisted dislocation motion. At lower stresses the value of the stress exponent is near unity suggesting that viscous creep mechanisms such as Coble creep or grain boundary sliding may be operative, but the data are too sparse to be conclusive. The reported creep rates from uniaxial tests [1] in vacuum are several times higher than the creep rates measured here. This is probably due to the larger interstitial oxygen concentration of the creep tubing (699 wppm) compared to the sheet stock (310 wppm) used for tensile specimen fabrication. Finally, the creep strength of V-4Cr-4Ti at 700 and 800 degrees C was superior to the V-3Fe-4Ti alloy.

  16. Stress response effects on growth, carcass characteristics, and tenderness in Bonsmara-influenced steers 

    E-Print Network [OSTI]

    Falkenberg, Shollie Marie

    2006-08-16T23:59:59.000Z

    Half-blood Bonsmara steers were evaluated for temperament during stressful situations to discover the relationships between behavioral stress responses, growth, carcass characteristics and tenderness. Two experiments were ...

  17. Contact stress in a whole joint bioreactor : intrinsic levels & augmentation by external loading

    E-Print Network [OSTI]

    Deppe, Allison Margaret

    2007-01-01T23:59:59.000Z

    Stress in a Whole Joint Bioreactor: Intrinsic Levels &Stress in a Whole Joint Bioreactor: Intrinsic levels &Sah, Chair A whole joint bioreactor was recently described

  18. SciTech Connect: Stress corrosion cracking of alloy 600 using...

    Office of Scientific and Technical Information (OSTI)

    Stress corrosion cracking of alloy 600 using the constant strain rate test Citation Details In-Document Search Title: Stress corrosion cracking of alloy 600 using the constant...

  19. Using the stress response to monitor process control: pathways to more effective bioremediation

    E-Print Network [OSTI]

    Hazen, Terry C.

    2010-01-01T23:59:59.000Z

    Title: Authors: Addresses: Process Control Monitoring byStress Response Process Control by Stress Response Terry C.response as a basis for process control of microbiological

  20. Effect of Salt Stress on Purslane and Potential Health Benefits: Oxalic Acid and Fatty Acids Profile

    E-Print Network [OSTI]

    Carvalho, Isabel S.; Teixeira, Mónica; Brodelius, Maria

    2009-01-01T23:59:59.000Z

    IS. 2009. Effects of salt stress on purslane (Portulacaacid concentration occurs when the salt stress concentrationfor higher concentration of salt in both purslanes. In GL

  1. A method for reducing encapsulation stress to ferrite pot cores

    SciTech Connect (OSTI)

    Sanchez, R.O.

    1994-08-01T23:59:59.000Z

    This paper describes a method of reducing the mechanical stress caused when a ferrite pot core is encapsulated in a rigid epoxy. the stresses are due to the differences of coefficient of thermal expansion between the two materials. A stress relief medium, phenolic micro-balloon-filled, syntactic polysulfide, is molded into the shape of the pot core. The molded polysulfide is bonded to the core prior to encapsulation. The new package design has made a significant difference in the ability to survive temperature cycles.

  2. Experimental stress analysis of a sphere under a diametral load

    E-Print Network [OSTI]

    Noyes, Theodore Alvan

    1957-01-01T23:59:59.000Z

    Title Page 1. Sphere ? 1, XY Plane, Method of Constant " 6'. 2. Sphere 4 1, XZ Plane, Method of Constant 5 8". 14 19 3. Sphere P 1, Evaluation of Normal Stresses, 6, 6 x' y' and 6 , from Tables 1 and 2. s' Sphere ? 1, XY Plane, Shear Difference... Method. 5. Sphere ? 1, XZ Plane, Shear Difference Method. 24 27 29 6. Sphere and 6 z ? 1, Evaluation of Normal Stresses, 6, 6 x' y from Tables 4 and 5. 3O ix ABSTRACT A three dimensional stress analysis was made using the new photoelastic...

  3. Transient stress evolution in repulsion and attraction dominated glasses

    E-Print Network [OSTI]

    Christian P. Amann; Matthias Fuchs

    2014-06-04T23:59:59.000Z

    We present results from microscopic mode coupling theory generalized to colloidal dispersions under shear in an integration-through-transients formalism. Stress-strain curves in start-up shear, flow curves, and normal stresses are calculated with the equilibrium static structure factor as only input. Hard spheres close to their glass transition are considered, as are hard spheres with a short-ranged square-well attraction at their attraction dominated glass transition. The consequences of steric packing and physical bond formation on the linear elastic response, the stress release during yielding, and the steady plastic flow are discussed and compared to experimental data from concentrated model dispersions.

  4. Residual stresses in bakelite models induced by quenching

    E-Print Network [OSTI]

    Jarvi, Ray Victor

    1952-01-01T23:59:59.000Z

    of stresses caused by quenching the model follows. kn annealed sample was sub)ected to a loading which would produce pure bending in a test seotion. Tbe sample so loaded served as a st4uwhz4 for detenalning the type and the mgnitude of stress existing... in the quenched models and is shown in Figure 1. The test model was plaoed at right angles to tbe beam loaded in bending, In the q~ model, only longitudinal stresses axe present in regions suffioientIy removed to avoid en~ffect This is true since, in a study...

  5. 3 Grundlagen der Darstellung und Verarbeitung von Information 3.2 Codes 3-43(67) Definition 3.36: Das Verschieben der Bits um Positionen nach links (rechts) mit Auffllen durch Nullen heit

    E-Print Network [OSTI]

    Arndt, Holger

    ...10 - 0...0 realisiert die Multiplikation mit im Zweierkomplement: Satz 3.37: Tritt kein Ã?berlauf ein 2 einem Links-Shift der Ziffern von zk() um Positionen. Ã?berlauf tritt genau dann ein, wenn die...---1...10. 1. Fall: 0, also zk() = und -1 = 0. Tritt Ã?berlauf ein, so ist 2 2-1 , also 2--1 . Also ist

  6. The fission yeast stress MAPK cascade regulates the pmp3+ gene that encodes a highly conserved plasma membrane protein.

    E-Print Network [OSTI]

    Wang, Ling-yu; Shiozaki, Kazuhiro

    2006-01-01T23:59:59.000Z

    incubation at 37°C for heat stress; 2 M sorbitol for highof 1 M sorbitol (A), heat stress at 39°C (B) and oxidativeoxidative stress, heat stress, UV irradiation and

  7. The fission yeast stress MAPK cascade regulates the pmp3(+) gene that encodes a highly conserved plasma membrane protein

    E-Print Network [OSTI]

    Wang, Ling-yu; Shiozaki, Kazuhiro

    2006-01-01T23:59:59.000Z

    incubation at 37°C for heat stress; 2 M sorbitol for highof 1 M sorbitol (A), heat stress at 39°C (B) and oxidativeoxidative stress, heat stress, UV irradiation and

  8. Effects of fiber and interfacial layer architectures on the thermoplastic response of metal-matrix composites

    SciTech Connect (OSTI)

    Pindera, M.J.; Freed, A.D.; Arnold, S.M.

    1992-08-01T23:59:59.000Z

    Examined here is the effect of fiber and interfacial layer morphologies on thermal fields in metal matrix composites (MMCs). A micromechanics model based on an arbitrarily layered concentric cylinder configuration is used to calculate thermal stress fields in MMCs subjected to spatially uniform temperature changes. The fiber is modelled as a layered material with isotropic or orthotropic elastic layers, whereas the surrounding matrix, including interfacial layers, is treated as a strain-hardening, elastoplastic, von Mises solid with temperature-dependent parameters. The solution to the boundary-value problem of an arbitrarily layered concentric cylinder under the prescribed thermal loading is obtained using the local/global stiffness matrix formulation originally developed for stress analysis of multilayered elastic media. Examples are provided that illustrate how the morphology of the SCS6 silicon carbide fiber and the use of multiple compliant layers at the fiber/matrix interface affect the evolution of residual stresses in SiC/Ti composites during fabrication cool-down.

  9. The effect of anticipatory psychosocial stress on frontal executive functions 

    E-Print Network [OSTI]

    Olga, Wudarczyk

    2010-06-30T23:59:59.000Z

    Previous research has found that stress hormone cortisol affects cognition, especially those cognitive abilities associated with the areas of the brain abundant in glucocorticoid receptors (e.g. Lupien & McEwen, 1997). ...

  10. OSS 19.8 Heat Stress 4/3/95

    Broader source: Energy.gov [DOE]

    The objective of this surveillance is to evaluate the effectiveness of actions taken by the contractor to protect workers from the effects of heat stress.  The Facility Representative will observe...

  11. Transformation induced plasticity assisted steels: stress or strain affected martensitic

    E-Print Network [OSTI]

    Cambridge, University of

    Transformation induced plasticity assisted steels: stress or strain affected martensitic transformation? S. Chatterjee and H. K. D. H. Bhadeshia* Transformation induced plasticity (TRIP) assisted steels contain a small quantity of carbon enriched retained austenite, which transforms into martensite during

  12. Propeller blade stress estimates using lifting line theory

    E-Print Network [OSTI]

    Epps, Brenden P.

    OpenProp, an open-source computational tool for the design and analysis of propellers and horizontal-axis turbines, is extended to provide estimates of normal stresses in the blades for both on- and off-design operating ...

  13. Predicting stress-induced velocity anisotropy in rocks

    SciTech Connect (OSTI)

    Mavko, G.; Mukerji, T.; Godfrey, N. [Stanford Univ., CA (United States). Rock Physics Lab.] [Stanford Univ., CA (United States). Rock Physics Lab.

    1995-07-01T23:59:59.000Z

    A simple transformation, using measured isotropic V{sub P} and V{sub S} versus hydrostatic pressure, is presented for predicting stress-induced seismic velocity anisotropy in rocks. The compliant, crack-like portions of the pore space are characterized by generalized compressional and shear compliances that are estimated form the isotropic V{sub P} and V{sub S}. The physical assumption that the compliant porosity is crack-like means that the pressure dependence of the generalized compliances is governed primarily by normal tractions resolved across cracks and defects. This allows the measured pressure dependence to be mapped form the hydrostatic stress state to any applied nonhydrostatic stress. Predicted P- and S-wave velocities agree reasonably well with uniaxial stress data for Barre Granite and Massillon Sandstone. While it is mechanically similar to methods based on idealized ellipsoidal cracks, the approach is relatively independent of any assumed crack geometry and is not limited to small crack densities.

  14. Particle shape effects on the stress response of granular packings

    E-Print Network [OSTI]

    Haller, Gary L.

    -convex geometries such as hexapods with various arm lengths, dolos, and tetrahedral frames. All particles were 3D-printed stress and energy loss during cyclic loading, we identify trends among the various shapes that allow

  15. acute maternal stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    Psychosocial Stress and Their Relationship to Level of Habitual Caffeine Consumption JAMES D. LANE, PH.D., R. ALISON ADCOCK, B.A., REDFORD B. WILLIAMS, M.D., AND CYNTHIA M....

  16. alloy thermal stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    as one arm) and an amplifier connected into a constant-temperature mode, with a designed overheat ratio of 10%. The calibration of the shear stress sensor is conducted in a...

  17. Compressive stress enhances coordinated migration of mammary carcinoma cells

    E-Print Network [OSTI]

    Tse, Janet M. (Janet Man-Yu)

    2010-01-01T23:59:59.000Z

    Cancer research has traditionally focused on genetic and biochemical changes during tumor progression. Uncontrolled cell proliferation of a solid tumor in a confined space not only creates well-studied oxidative stress ...

  18. apoptosis oxidative stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 81 Acrolein induces oxidative stress in brain mitochondria Jian Luo, Riyi Shi* Engineering...

  19. STRESS AND FAULTING IN THE COSO GEOTHERMAL FIELD: UPDATE AND...

    Open Energy Info (EERE)

    THE EAST FLANK AND COSO WASH Jump to: navigation, search OpenEI Reference LibraryAdd to library Conference Proceedings: STRESS AND FAULTING IN THE COSO GEOTHERMAL FIELD: UPDATE...

  20. Residual stress in electrodeposited nanocrystalline nickel-tungsten coatings

    E-Print Network [OSTI]

    Ziebell, Tiffany D.

    Characterizing the residual stress of thick nanocrystalline electrodeposits poses several unique challenges due to their fine grain structure, thickness distribution, and matte surface. We use a three-dimensional ...

  1. Stress Wave Source Characterization: Impact, Fracture, and Sliding Friction

    E-Print Network [OSTI]

    McLaskey, Gregory Christofer

    2011-01-01T23:59:59.000Z

    stress wave sources from the PMMA and rock are then linkedof a 3-D source inside an artificial rock, J. Sound Vib.two different calibration sources on the rock base plate. a,

  2. Evaluation of heat stress in an aluminum smelter

    E-Print Network [OSTI]

    Rose, Stacy Rahkell

    1999-01-01T23:59:59.000Z

    of heat stress and heat strain was evaluated for the aluminum smelter workers at Alcoa, Rockdale Operations. Personal, environmental, and metabolic factors that contribute to heat-related illnesses were identified. The effectiveness of current...

  3. Evaluation of iron-deficiency stress response of maize

    E-Print Network [OSTI]

    Choi, Yim Hong

    1996-01-01T23:59:59.000Z

    A nutrient solution system with siliceous ferrihydrite as the Fe source was developed to screen 20 maize cultivars in a growth chamber for their Fe-deficiency stress tolerances. The Fe-supplying power of the siliceous ferrihydrite was compared...

  4. Seismicity and seismic stress in the Coso Range, Coso geothermal...

    Open Energy Info (EERE)

    seismic stress in the Coso Range, Coso geothermal field, and Indian Wells Valley region, Southeast-Central California Jump to: navigation, search OpenEI Reference LibraryAdd to...

  5. Stress analysis of a hybrid composite drilling riser

    E-Print Network [OSTI]

    Sundstrom, Keith Andrew

    1996-01-01T23:59:59.000Z

    technique for homogenizing material properties of adjacent plies was de- veloped to reduce the number of elements through the wall thickness. The results were postproc- essed to obtain ply level stress and strain data and used to make a prediction... with the Institut Franpais de Pdtrole and Aerospatiale, designed composite tubes (9 inch inner diameter) for riser applica- tions that satisfied four constraints: zero axial expansion due to thermal loads or internal pressure, and design stresses in the two...

  6. An investigation of stress concentration effects in welding elbows

    E-Print Network [OSTI]

    Ballard, Mike Wayne

    1987-01-01T23:59:59.000Z

    AN INVESTIGATION OF STRESS CONCENTRATION EFFECTS IN WELDING ELBOWS A Thesis by MIKE WAYNE BALLARD Submitted to the Graduate College of Texas A & M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE... December, 1986 Major Subject; Mechanical Engineering AN INVESTIGATION OF STRESS CONC~TION EFFECTS IN WELDING ELBOWS A Thesis by MIKE WAYNE BALLARD Approved as to style and content by; Mog Henriksen (Ch ' of Committee) Joh J. (Me er) lorn Brya L...

  7. An investigation of stress concentration effects in welding elbows 

    E-Print Network [OSTI]

    Ballard, Mike Wayne

    1987-01-01T23:59:59.000Z

    AN INVESTIGATION OF STRESS CONCENTRATION EFFECTS IN WELDING ELBOWS A Thesis by MIKE WAYNE BALLARD Submitted to the Graduate College of Texas A & M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE... December, 1986 Major Subject; Mechanical Engineering AN INVESTIGATION OF STRESS CONC~TION EFFECTS IN WELDING ELBOWS A Thesis by MIKE WAYNE BALLARD Approved as to style and content by; Mog Henriksen (Ch ' of Committee) Joh J. (Me er) lorn Brya L...

  8. Method to adjust multilayer film stress induced deformation of optics

    DOE Patents [OSTI]

    Mirkarimi, Paul B. (Sunol, CA); Montcalm, Claude (Livermore, CA)

    2000-01-01T23:59:59.000Z

    A buffer-layer located between a substrate and a multilayer for counteracting stress in the multilayer. Depositing a buffer-layer having a stress of sufficient magnitude and opposite in sign reduces or cancels out deformation in the substrate due to the stress in the multilayer. By providing a buffer-layer between the substrate and the multilayer, a tunable, near-zero net stress results, and hence results in little or no deformation of the substrate, such as an optic for an extreme ultraviolet (EUV) lithography tool. Buffer-layers have been deposited, for example, between Mo/Si and Mo/Be multilayer films and their associated substrate reducing significantly the stress, wherein the magnitude of the stress is less than 100 MPa and respectively near-normal incidence (5.degree.) reflectance of over 60% is obtained at 13.4 nm and 11.4 nm. The present invention is applicable to crystalline and non-crystalline materials, and can be used at ambient temperatures.

  9. On the capillary stress tensor in wet granular materials

    E-Print Network [OSTI]

    Luc Scholtès; Pierre-Yves Hicher; François Nicot; Bruno Chareyre; Félix Darve

    2011-05-05T23:59:59.000Z

    This paper presents a micromechanical study of unsaturated granular media in the pendular regime, based upon numerical experiments using the discrete element method, compared to a microstructural elastoplastic model. Water effects are taken into account by adding capillary menisci at contacts and their consequences in terms of force and water volume are studied. Simulations of triaxial compression tests are used to investigate both macro and micro-effects of a partial saturation. The results provided by the two methods appear to be in good agreement, reproducing the major trends of a partially saturated granular assembly, such as the increase in the shear strength and the hardening with suction. Moreover, a capillary stress tensor is exhibited from capillary forces by using homogenisation techniques. Both macroscopic and microscopic considerations emphasize an induced anisotropy of the capillary stress tensor in relation with the pore fluid distribution inside the material. In so far as the tensorial nature of this fluid fabric implies shear effects on the solid phase associated with suction, a comparison has been made with the standard equivalent pore pressure assumption. It is shown that water effects induce microstrural phenomena that cannot be considered at the macro level, particularly when dealing with material history. Thus, the study points out that unsaturated soil stress definitions should include, besides the macroscopic stresses such as the total stress, the microscopic interparticle stresses such as the ones resulting from capillary forces, in order to interpret more precisely the implications of the pore fluid on the mechanical behaviour of granular materials.

  10. Plastic stress analysis of pulse and resistive magnets

    SciTech Connect (OSTI)

    Eyssa, Y.M.; Markiewicz, W.D.; Pernambuco-Wise, P. [National High Magnetic Field Lab., Tallahassee, FL (United States)] [National High Magnetic Field Lab., Tallahassee, FL (United States)

    1996-07-01T23:59:59.000Z

    The primary consideration in the design and development of high field resistive and pulsed coil (30--100 tesla) is the stress and strain level in the winding and the reinforcement. Under such high loading conditions particularly for pulse coils, it is expected that the conductor material will exceed its elastic limit. The technique used here to calculate stresses beyond the elastic limit in a multi-region solenoid geometry is: The maximum load at the mid-plane is divided into many small load steps. When each load step is applied to the winding, the stresses and the strains are calculated based on the material properties at the end of the previous load step. If the effective stress in any region exceeds the elastic limit then the modulus of this region is redefined based on the slope of the stress-strain curve at that point. Using this technique of superposition, the stresses and strains are repeatedly calculated until maximum loading is reached. The procedure can also be reversed simulating the tail of a magnetic pulse, resulting in the conductor being under compression and the reinforcement in tension. It is possible to apply different cycles of loading and unloading using different elastic limits.

  11. Residual stresses in weld overlay tubes: A finite element study

    SciTech Connect (OSTI)

    Taljat, B.; Zacharia, T.; Wang, X.L.; Keiser, J.R. [Oak Ridge National Lab., TN (United States). Metals and Ceramics Div.; Feng, Z. [Edison Welding Inst., Columbus, OH (United States); Jirinec, M.J. [Welding Services, Inc., Norcross, GA (United States)

    1997-01-03T23:59:59.000Z

    Residual stresses and strains in a tube with circumferential weld overlay were analyzed by the finite element (FE) method. The objective of this work was to develop and verify a FE model, to determine the magnitude and distribution of residual stresses in the weld overlay tube, and to evaluate the significance of two contributing factors to residual stress: (1) difference in material properties between tube and weld material, and (2) thermal gradients in the weld. An axisymmetric FE model was developed to simulate the circumferential two-layer welding process of alloy 625 overlay on SA210 tube. The first layer was modeled as a gas metal arc welding process with filler metal, whereas the autogenous gas tungsten arc welding process was modeled for the second layer. Neutron diffraction technique was used to experimentally determine residual elastic strains in the weld overlay tube. Comparison with the FE results shows overall good agreement. Both the experimental and FE results show high compressive stresses at the inside tube surface and high tensile stresses in the weld overlay. This suggests that weld overlay may be used to relieve tensile or produce compressive stresses at the inside tube surface, which is significant for applications where crack initiation is found at the root pass of the joining weld.

  12. Single-wavenumber Representation of Nonlinear Energy Spectrum in Elastic-Wave Turbulence of {F}öppl-von {K}ármán Equation: Energy Decomposition Analysis and Energy Budget

    E-Print Network [OSTI]

    Naoto Yokoyama; Masanori Takaoka

    2014-12-09T23:59:59.000Z

    A single-wavenumber representation of nonlinear energy spectrum, i.e., stretching energy spectrum is found in elastic-wave turbulence governed by the F\\"oppl-von K\\'arm\\'an (FvK) equation. The representation enables energy decomposition analysis in the wavenumber space, and analytical expressions of detailed energy budget in the nonlinear interactions are obtained for the first time in wave turbulence systems. We numerically solved the FvK equation and observed the following facts. Kinetic and bending energies are comparable with each other at large wavenumbers as the weak turbulence theory suggests. On the other hand, the stretching energy is larger than the bending energy at small wavenumbers, i.e., the nonlinearity is relatively strong. The strong correlation between a mode $a_{\\bm{k}}$ and its companion mode $a_{-\\bm{k}}$ is observed at the small wavenumbers. Energy transfer shows that the energy is input into the wave field through stretching-energy transfer at the small wavenumbers, and dissipated through the quartic part of kinetic-energy transfer at the large wavenumbers. A total-energy flux consistent with the energy conservation is calculated directly by using the analytical expression of the total-energy transfer, and the forward energy cascade is observed clearly.

  13. Adjusting Milk Replacer Intake During Heat Stress and Non-heat Stress as a Means of Improving Dairy Calf Performance

    E-Print Network [OSTI]

    Chavez, Theresa Marie

    2012-07-16T23:59:59.000Z

    ADJUSTING MILK REPLACER INTAKE DURING HEAT STRESS AND NON-HEAT STRESS AS A MEANS OF IMPROVING DAIRY CALF PERFORMANCE A Thesis by THERESA MARIE CHAVEZ Submitted to the Office of Graduate Studies of Texas A&M University... A Thesis by THERESA MARIE CHAVEZ Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved by: Co-Chairs of Committee, Glenn Holub...

  14. Molecular chaperones and the stress of oncogenesis Dick D Mosser*,1

    E-Print Network [OSTI]

    Morimoto, Richard

    lethal effects of stress and proteotoxicity. These stress-protective heat-shock pro- teins are often. Heat-shock proteins with dual roles as regulators of protein conformation and stress sensors mayMolecular chaperones and the stress of oncogenesis Dick D Mosser*,1 and Richard I Morimoto2 1

  15. Salt Stress in Desulfovibrio vulgaris Hildenborough: An integratedgenomics approach

    SciTech Connect (OSTI)

    Mukhopadhyay, Aindrila; He, Zhili; Alm, Eric J.; Arkin, Adam P.; Baidoo, Edward E.; Borglin, Sharon C.; Chen, Wenqiong; Hazen, Terry C.; He, Qiang; Holman, Hoi-Ying; Huang, Katherine; Huang, Rick; Hoyner,Dominique C.; Katz, Natalie; Keller, Martin; Oeller, Paul; Redding,Alyssa; Sun, Jun; Wall, Judy; Wei, Jing; Yang, Zamin; Yen, Huei-Che; Zhou, Jizhong; Keasling Jay D.

    2005-12-08T23:59:59.000Z

    The ability of Desulfovibrio vulgaris Hildenborough to reduce, and therefore contain, toxic and radioactive metal waste has made all factors that affect the physiology of this organism of great interest. Increased salinity is an important and frequent fluctuation faced by D. vulgaris in its natural habitat. In liquid culture, exposure to excess salt resulted in striking elongation of D. vulgaris cells. Using data from transcriptomics, proteomics, metabolite assays, phospholipid fatty acid profiling, and electron microscopy, we used a systems approach to explore the effects of excess NaCl on D. vulgaris. In this study we demonstrated that import of osmoprotectants, such as glycine betaine and ectoine, is the primary mechanism used by D. vulgaris to counter hyperionic stress. Several efflux systems were also highly up-regulated, as was the ATP synthesis pathway. Increases in the levels of both RNA and DNA helicases suggested that salt stress affected the stability of nucleic acid base pairing. An overall increase in the level of branched fatty acids indicated that there were changes in cell wall fluidity. The immediate response to salt stress included up-regulation of chemotaxis genes, although flagellar biosynthesis was down-regulated. Other down-regulated systems included lactate uptake permeases and ABC transport systems. The results of an extensive NaCl stress analysis were compared with microarray data from a KCl stress analysis, and unlike many other bacteria, D. vulgaris responded similarly to the two stresses. Integration of data from multiple methods allowed us to develop a conceptual model for the salt stress response in D. vulgaris that can be compared to those in other microorganisms.

  16. Influence of target structure on film stress in WTi sputtering

    SciTech Connect (OSTI)

    Lo, C.F.; Wang, H.; Gilman, P. [Materials Research Corp., Orangeburg, NY (United States)

    1998-12-31T23:59:59.000Z

    In this report, the effect of sputtering target microstructure on the deposited film stress was investigated. By controlling the metallurgical process, two types of W-10wt%Ti target constituents, namely single-phase and multiple-phase WTi, were prepared. The former one was composed of W-rich ({beta}Ti,W) phase only, the latter one was with W, W-rich ({beta}Ti,W) and Ti-rich ({beta}Ti,W) phases. The stress of the films deposited on 12.7 cm diameter silicon oxide wafers from the single-phase target tends to be more compressive than that from the multiple-phase target. By increasing wafer temperature, the compressive stress was linearly decreased. In addition, the level of film stress was also affected by the film thickness and other sputtering parameters. To understand the causes for the differences in film stress between the multiple-phase and single-phase derived films, an evaluation of the film structure using a field-emission scanning electron microscope (FE-SEM) and mechanical testing using a nano-indentation instrument were performed. Finer domains with denser laminar structure were observed on the films deposited from the single-phase target. However, no significant difference in mechanical properties was found between these two from the nano-indentation measurements. It is envisioned that the more uniform solid solution between the W and Ti in the films obtained by sputtering the single-phase targets generates a higher compressive stress when deposited on the silicon oxide wafers resulting in a higher compressive stress.

  17. Performance of Nb3Sn Quadrupole Under High Stress

    SciTech Connect (OSTI)

    Felice, H.; Bajko, M.; Bingham, B.; Bordini, B.; Bottura, L.; Caspi, S.; Rijk, G. De; Dietderich, D.; Ferracin, P.; Giloux, C.; Godeke, A.; Hafalia, R.; Milanese, A.; Rossi, L.; Sabbi, G. L.

    2010-08-01T23:59:59.000Z

    Future upgrades of the Large Hadron Collider (LHC) will require large aperture and high gradient quadrupoles. Nb{sub 3}Sn is the most viable option for this application but is also known for its strain sensitivity. In high field magnets, with magnetic fields above 12 T, the Lorentz forces will generate mechanical stresses that may exceed 200 MPa in the windings. The existing measurements of critical current versus strain of Nb{sub 3}Sn strands or cables are not easily applicable to magnets. In order to investigate the impact of high mechanical stress on the quench performance, a series of tests was carried out within a LBNL/CERN collaboration using the magnet TQS03 (a LHC Accelerator Research Program (LARP) 1-meter long, 90-mm aperture Nb{sub 3}Sn quadrupole). The magnet was tested four times at CERN under various pre-stress conditions. The average mechanical compressive azimuthal pre-stress on the coil at 4.2 K ranged from 120 MPa to 200 MPa. This paper reports on the magnet performance during the four tests focusing on the relation between pre-stress conditions and the training plateau.

  18. Backfill Stress and Strain Information within a Centrifuge Geosynthetic-Reinforced Slope Model under Working Stress and Large Soil Strain Conditions

    E-Print Network [OSTI]

    Zornberg, Jorge G.

    Backfill Stress and Strain Information within a Centrifuge Geosynthetic-Reinforced Slope Model with a centrifuge test are used to investigate the mobilization of backfill stress and strain within a geosynthetic a centrifuge GRS slope model. Numerical results indicate that soil stress mobilization can be described

  19. Bracketing to speed convergence illustrated on the von Newmann algorithm for finding a feasible solution to a linear program with a convexity contraint. Technical report

    SciTech Connect (OSTI)

    Dantzig, G.B.

    1992-10-01T23:59:59.000Z

    Analogous to gunners firing trial shots to bracket a target in order to adjust direction and distance, we demonstate that it is sometimes faster not to apply an algorithm directly, but to roughly approximately solve several perturbations of the problem and then combine these rough approximations to get an exact solution. To find a feasible solution to an m-equation linear program with a convexity constraint, the von Neumann Algorithm generates a sequence of approximate solutions which converge very slowly to the right hand side b{sup 0}. However, it can be redirected so that in the first few iterations it is guaranteed to move rapidly towards the neighborhood of one of m + 1 perturbed right hand sides {cflx b}{sup i}, then redirected in turn to the next {cflx b}{sup i}. Once within the neighborhood of each {cflx b}{sup i}, a weighted sum of the approximate solutions. {bar x}{sup i} yields the exact solution of the unperturbed problem where the weights are found by solving a system of m + 1 equations in m + 1 unknowns. It is assumed an r > 0 is given for which the problem is feasible for all right hand sides b whose distance {parallel}b - b{sup 0}{parallel}{sub 2} {le} r. The feasible solution is found in less than 4(m+ 1){sup 3}/r{sup 2} iterations. The work per iteration is {delta}mn + 2m + n + 9 multiplications plus {delta}mn + m + n + 9 additions or comparisons where {delta} is the density of nonzero coeffients in the matrix.

  20. Bracketing to speed convergence illustrated on the von Newmann algorithm for finding a feasible solution to a linear program with a convexity contraint

    SciTech Connect (OSTI)

    Dantzig, G.B.

    1992-10-01T23:59:59.000Z

    Analogous to gunners firing trial shots to bracket a target in order to adjust direction and distance, we demonstate that it is sometimes faster not to apply an algorithm directly, but to roughly approximately solve several perturbations of the problem and then combine these rough approximations to get an exact solution. To find a feasible solution to an m-equation linear program with a convexity constraint, the von Neumann Algorithm generates a sequence of approximate solutions which converge very slowly to the right hand side b[sup 0]. However, it can be redirected so that in the first few iterations it is guaranteed to move rapidly towards the neighborhood of one of m + 1 perturbed right hand sides [cflx b][sup i], then redirected in turn to the next [cflx b][sup i]. Once within the neighborhood of each [cflx b][sup i], a weighted sum of the approximate solutions. [bar x][sup i] yields the exact solution of the unperturbed problem where the weights are found by solving a system of m + 1 equations in m + 1 unknowns. It is assumed an r > 0 is given for which the problem is feasible for all right hand sides b whose distance [parallel]b - b[sup 0][parallel][sub 2] [le] r. The feasible solution is found in less than 4(m+ 1)[sup 3]/r[sup 2] iterations. The work per iteration is [delta]mn + 2m + n + 9 multiplications plus [delta]mn + m + n + 9 additions or comparisons where [delta] is the density of nonzero coeffients in the matrix.

  1. Specified pipe fittings susceptible to sulfide stress cracking

    SciTech Connect (OSTI)

    McIntyre, D.R.; Moore, E.M. Jr. [Saudi Aramco, Dhahran (Saudi Arabia)

    1996-01-01T23:59:59.000Z

    The NACE Standard MR0175 limit of HRC 22 is too high for cold-forged and stress-relieved ASTM A234 WPB pipe fittings. Hardness surveys and sulfide stress cracking test results per ASTM G 39 and NACE TM0177 Method B are presented to support this contention. More stringent inspection and a hardness limit of HB 197 (for cold-forged and stress-relieved fittings only) are recommended. The paper describes a case in which fittings were welded in place in wet sour service flow lines and gas-oil separating plants which were ready to start. The failure of a welded fitting shortly after start-up led to extensive field hardness testing on all fittings from this manufacturer.

  2. Torsional waves propagation in an initially stressed dissipative cylinder

    E-Print Network [OSTI]

    M. M. Selim

    2009-03-28T23:59:59.000Z

    The present paper has been framed to show the effect of damping on the propagation of torsional waves in an initially stressed, dissipative, incompressible cylinder of infinite length. A governing equation has been formulated on Biot's incremental deformation theory. The velocities of torsional waves are obtained as complex ones, in which real part gives the phase velocity of propagation and corresponding imaginary part gives the damping. The study reveals that the damping of the medium has strong effect in the propagation of torsional wave. Since every medium has damping so it is more realistic to use the damped wave equation instead of the undamped wave equation. The study also shows that the velocity of propagation of such waves depend on the presence of initial stress. The influences of damping and initial stresses are shown separately.

  3. Quantification of residual stress from photonic signatures of fused silica

    SciTech Connect (OSTI)

    Cramer, K. Elliott; Yost, William T. [NASA Langley Research Center, Hampton, VA 23681 (United States); Hayward, Maurice [College of William and Mary, Williamsburg, VA 23185 (United States)

    2014-02-18T23:59:59.000Z

    A commercially available grey-field polariscope (GFP) instrument for photoelastic examination is used to assess impact damage inflicted upon the outer-most pane of Space Shuttle windows made from fused silica. A method and apparatus for calibration of the stress-optic coefficient using four-point bending is discussed. The results are validated on known material (acrylic) and are found to agree with literature values to within 6%. The calibration procedure is then applied to fused-silica specimens and the stress-optic coefficient is determined to be 2.43 ± 0.54 × 10{sup ?12} Pa{sup ?1}. Fused silica specimens containing impacts artificially made at NASA’s Hypervelocity Impact Technology Facility (HIT-F), to simulate damage typical during space flight, are examined. The damage sites are cored from fused silica window carcasses and examined with the GFP. The calibrated GFP measurements of residual stress patterns surrounding the damage sites are presented.

  4. Tensile-stressed microelectromechanical apparatus and microelectromechanical relay formed therefrom

    DOE Patents [OSTI]

    Fleming, James G. (Albuquerque, NM)

    2008-03-04T23:59:59.000Z

    A microelectromechanical (MEM) apparatus is disclosed which includes a shuttle suspended above a substrate by two or more sets of tensile-stressed beams which are operatively connected to the shuttle and which can comprise tungsten or a silicon nitride/polysilicon composite structure. Initially, the tensile stress in each set of beams is balanced. However, the tensile stress can be unbalanced by heating one or more of the sets of beams; and this can be used to move the shuttle over a distance of up to several tens of microns. The MEM apparatus can be used to form a MEM relay having relatively high contact and opening forces, and with or without a latching capability.

  5. Oxidative stress and oxidative damage in chemical carcinogenesis

    SciTech Connect (OSTI)

    Klaunig, James E., E-mail: jklauni@indiana.edu; Wang Zemin; Pu Xinzhu; Zhou Shaoyu

    2011-07-15T23:59:59.000Z

    Reactive oxygen species (ROS) are induced through a variety of endogenous and exogenous sources. Overwhelming of antioxidant and DNA repair mechanisms in the cell by ROS may result in oxidative stress and oxidative damage to the cell. This resulting oxidative stress can damage critical cellular macromolecules and/or modulate gene expression pathways. Cancer induction by chemical and physical agents involves a multi-step process. This process includes multiple molecular and cellular events to transform a normal cell to a malignant neoplastic cell. Oxidative damage resulting from ROS generation can participate in all stages of the cancer process. An association of ROS generation and human cancer induction has been shown. It appears that oxidative stress may both cause as well as modify the cancer process. Recently association between polymorphisms in oxidative DNA repair genes and antioxidant genes (single nucleotide polymorphisms) and human cancer susceptibility has been shown.

  6. Triple-material stress-strain resistivity gage

    DOE Patents [OSTI]

    Stout, R.B.

    1987-05-19T23:59:59.000Z

    A triple material piezoresistive gage provides multi-component elastic stress or strain measurements. Thin foils of three piezoresistive materials, e.g., ytterbium, manganin, and constantan, are configured in a nested serpentine rectilinear grind or other grind arrangement and embedded in a medium, preferably normal to the direction of shock wave propagation. The output of the gage is a resistivity change history for each material of gage. Each resistivity change is independent of the others so that three diagonal components of the elastic stress or strain tensor can be calculated form the resistivity measurements. 4 figs.

  7. Dual-axis hole-drilling ESPI residual stress measurements

    SciTech Connect (OSTI)

    Steinzig, Michael [Los Alamos National Laboratory; Schajer, Gary [UNIV OF BRITISH COLUMBIA

    2008-01-01T23:59:59.000Z

    A novel dual-axis ESPI hole-drilling residual stress measurement method is presented. The method enables the evaluation of all the in-plane normal stress components with similar response to measurement errors, significantly lower than with single-axis measurements. A numerical method is described that takes advantage of, and compactly handles, the additional optical data that are available from the second measurement axis. Experimental tests were conducted on a calibrated specimen to demonstrate the proposed method, and the results supported theoretical expectations.

  8. Triple-material stress-strain resistivity gage

    DOE Patents [OSTI]

    Stout, R.B.

    1988-05-17T23:59:59.000Z

    A triple material piezoresistive gage provides multi-component elastic stress measurements is disclosed. Thin foils of three piezoresistive materials, e.g. ytterbium, manganin, and constantan, are configured in a nested serpentine rectilinear grid or other grid arrangement and embedded in a medium, preferably normal to the direction of shock wave propagation. The output of the gage is a resistivity change history for each material of the gage. Each resistivity change is independent of the others so that three diagonal components of the elastic stress or strain tensor can be calculated from the resistivity measurements. 4 figs.

  9. A study of Macrophomina phaseolina, soybean, and water stress

    E-Print Network [OSTI]

    Shokes, Frederick Milton

    1975-01-01T23:59:59.000Z

    uid Water Movement in Plants. Xylem resistance to water flow is generally low, but may increase due to cavitation under conditions of severe stress (41). The major resistance to liquid water flow in the plant is believed to be that of the root (6...A STUDY OF MACROPHOMINA PHASEOLINA, SOYBEAN, AND WATER STRESS A Thesis by FREDERICK MILTON SHOKES Submitted to the Graduate College of Texas A8cM University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE...

  10. A model of stress distribution in soft tissue under non-uniform loading

    E-Print Network [OSTI]

    Cunningham, Thomas Roy

    1981-01-01T23:59:59.000Z

    ='4a . 11. Minimum normal stress; h=Sa. o min -G min 70 sQ LIST OF FIGURES Figure Page Compression of the ear lobe under constant pressure of 100 mmHg Threshold curve for ulceration in hamstring muscle 3. Constant thickness tissue model 12... 4. Modified tissue model 14 5. Radial stress; thickness, Sa 22 6. Circumferential stress; thickness, 5a 7. Longitudinal stress; thickness, 5a 23 24 Shear stress; thickness, 5a 25 9. Minimum normal stress; thickness, Sa 10. Maximum normal...

  11. Plastic cap evolution law derived from induced transverse isotropy in dilatational triaxial compression.

    SciTech Connect (OSTI)

    Macon, David James; Brannon, Rebecca Moss; Strack, Otto Erik

    2014-02-01T23:59:59.000Z

    Mechanical testing of porous materials generates physical data that contain contributions from more than one underlying physical phenomenon. All that is measurable is the “ensemble” hardening modulus. This thesis is concerned with the phenomenon of dilatation in triaxial compression of porous media, which has been modeled very accurately in the literature for monotonic loading using models that predict dilatation under triaxial compression (TXC) by presuming that dilatation causes the cap to move outwards. These existing models, however, predict a counter-intuitive (and never validated) increase in hydrostatic compression strength. This work explores an alternative approach for modeling TXC dilatation based on allowing induced elastic anisotropy (which makes the material both less stiff and less strong in the lateral direction) with no increase in hydrostatic strength. Induced elastic anisotropy is introduced through the use of a distortion operator. This operator is a fourth-order tensor consisting of a combination of the undeformed stiffness and deformed compliance and has the same eigenprojectors as the elastic compliance. In the undeformed state, the distortion operator is equal to the fourth-order identity. Through the use of the distortion operator, an evolved stress tensor is introduced. When the evolved stress tensor is substituted into an isotropic yield function, a new anisotropic yield function results. In the case of the von Mises isotropic yield function (which contains only deviatoric components), it is shown that the distortion operator introduces a dilatational contribution without requiring an increase in hydrostatic strength. In the thesis, an introduction and literature review of the cap function is given. A transversely isotropic compliance is presented, based on a linear combination of natural bases constructed about a transverse-symmetry axis. Using a probabilistic distribution of cracks constructed for the case of transverse isotropy, a compliance expression is presented that demonstrated a decrease in lateral stiffness, but leaves axial stiffness unchanged. A demonstration of how the distortion operator could be used in the elastic/plastic analysis of a von Mises surface loaded in TXC is also presented.

  12. Prediction of corn tortilla textural quality using stress relaxation methods

    E-Print Network [OSTI]

    Guo, Zhihong

    1998-01-01T23:59:59.000Z

    ). The effects of moisture content and resting time on corn masa textural property were investigated. Texture of properties of corn tortilla (fresh up to stale) was evaluated using the stress relaxation technique in two different modes, pure tension and bending-tension...

  13. Communication Effect of stress on the electric polarization in cement

    E-Print Network [OSTI]

    Chung, Deborah D.L.

    Communication Effect of stress on the electric polarization in cement Sihai Wen, D.D.L. Chung the extent of electric polarization in the transverse direction in cement pastes with and without carbon smaller when carbon fibers were present. It was smaller for carbon fiber cement paste containing silica

  14. Sensing the dynamics of oxidative stress using enhanced absorption in

    E-Print Network [OSTI]

    Dalang, Robert C.

    play a key role in cell signalling and oxidative stress mechanisms, therefore, sensing their production of cyt c in the presence of H2O2 with unprecedented sensitivity. Dynamic information on the modification of the cell oxidative status of Chlamydomonas reinhardtii, an aquatic green algae, was obtained under

  15. Finite element analyses of tool stresses in metal cutting processes

    SciTech Connect (OSTI)

    Kistler, B.L. [Sandia National Labs., Livermore, CA (United States)

    1997-01-01T23:59:59.000Z

    In this report, we analytically predict and examine stresses in tool tips used in high speed orthogonal machining operations. Specifically, one analysis was compared to an existing experimental measurement of stresses in a sapphire tool tip cutting 1020 steel at slow speeds. In addition, two analyses were done of a carbide tool tip in a machining process at higher cutting speeds, in order to compare to experimental results produced as part of this study. The metal being cut was simulated using a Sandia developed damage plasticity material model, which allowed the cutting to occur analytically without prespecifying the line of cutting/failure. The latter analyses incorporated temperature effects on the tool tip. Calculated tool forces and peak stresses matched experimental data to within 20%. Stress contours generally agreed between analysis and experiment. This work could be extended to investigate/predict failures in the tool tip, which would be of great interest to machining shops in understanding how to optimize cost/retooling time.

  16. Real-Time Redox Measurements during Endoplasmic Reticulum Stress Reveal

    E-Print Network [OSTI]

    Mullins, Dyche

    Real-Time Redox Measurements during Endoplasmic Reticulum Stress Reveal Interlinked Protein Folding.10.011 SUMMARY Disruption of protein folding in the endoplasmic reticulum (ER) causes unfolded proteins to accumu is active. Because ER redox po- tential is optimized for oxidative protein folding, we reasoned

  17. Particle Shape Effects on the Stress Response of Granular Packings

    E-Print Network [OSTI]

    Athanasios G. Athanassiadis; Marc Z. Miskin; Paul Kaplan; Nicholas Rodenberg; Seung Hwan Lee; Jason Merritt; Eric Brown; John Amend; Hod Lipson; Heinrich M. Jaeger

    2013-10-15T23:59:59.000Z

    We present measurements of the stress response of packings formed from a wide range of particle shapes. Besides spheres these include convex shapes such as the Platonic solids, truncated tetrahedra, and triangular bipyramids, as well as more complex, non-convex geometries such as hexapods with various arm lengths, dolos, and tetrahedral frames. All particles were 3D-printed in hard resin. Well-defined initial packing states were established through preconditioning by cyclic loading under given confinement pressure. Starting from such initial states, stress-strain relationships for axial compression were obtained at four different confining pressures for each particle type. While confining pressure has the largest overall effect on the mechanical response, we find that particle shape controls the details of the stress-strain curves and can be used to tune packing stiffness and yielding. By correlating the experimentally measured values for the effective Young's modulus under compression, yield stress and energy loss during cyclic loading, we identify trends among the various shapes that allow for designing a packing's aggregate behavior.

  18. Progress Report on Alloy 617 Isochronous Stress-Strain Curves

    SciTech Connect (OSTI)

    Jill K. Wright; Richard N. Wright; Nancy J. Lybeck

    2014-03-01T23:59:59.000Z

    Isochronous stress-strain curves for Alloy 617 up to a temperature of 1000°C will be required to qualify the material for elevated temperature design in Section III, Division 1, Subsection NH of the ASME Boiler and Pressure Vessel Code. Several potential methods for developing these curves are reviewed in this report. It is shown that in general power-law creep is the rate controlling deformation mechanism for a wide range of alloy heats, test temperatures and stresses. Measurement of the strain rate sensitivity of Alloy 617 indicates that the material is highly strain rate sensitive in the tensile deformation range above about 750°C. This suggests that the concept of a hot tensile curve as a bounding case on the isochronous stress-strain diagrams is problematic. The impact of strain rate on the hot tensile curves is examined and it is concluded that incorporating such a curve is only meaningful if a single tensile strain rate (typically the ASTM standard rate of 0.5%/min) is arbitrarily defined. Current experimentally determined creep data are compared to isochronous stress-strain curves proposed previously by the German programs in the 1980s and by the 1990 draft ASME Code Case. Variability in how well the experimental data are represented by the proposed design curves that suggests further analysis is necessary prior to completing a new draft Code Case.

  19. Development of a Longitudinal Rail Stress Measurement Device

    E-Print Network [OSTI]

    Hurley, Samuel J

    2014-11-12T23:59:59.000Z

    The continuous welded rails used in most of the United States lack expansion joints of any sort. This leads to a much smoother ride and a longer service life for rails and wheels, but also causes extreme temperatures to induce high stresses...

  20. EFFECTIVE TENSILE STRESS-STRAIN CHARACTERISTICS FOR REINFORCED CONCRETE

    E-Print Network [OSTI]

    EFFECTIVE TENSILE STRESS-STRAIN CHARACTERISTICS FOR REINFORCED CONCRETE L. Hwang, Graduate Student of reinforced concrete structures, the concrete continues to contribute to the effective stiffness of structures for reinforced concrete developed for analysis of reinforced and/or prestressed concrete structures. The model

  1. Method to reduce dislocation density in silicon using stress

    DOE Patents [OSTI]

    Buonassisi, Anthony; Bertoni, Mariana; Argon, Ali; Castellanos, Sergio; Fecych, Alexandria; Powell, Douglas; Vogl, Michelle

    2013-03-05T23:59:59.000Z

    A crystalline material structure with reduced dislocation density and method of producing same is provided. The crystalline material structure is annealed at temperatures above the brittle-to-ductile transition temperature of the crystalline material structure. One or more stress elements are formed on the crystalline material structure so as to annihilate dislocations or to move them into less harmful locations.

  2. Zymomonas with improved xylose utilization in stress conditions

    DOE Patents [OSTI]

    Caimi, Perry G; Emptage, Mark; Li, Xu; Viitanen, Paul V; Chou, Yat-Chen; Franden, Mary Ann; Zhang, Min

    2013-06-18T23:59:59.000Z

    Strains of xylose utilizing Zymomonas with improved xylose utilization and ethanol production during fermentation in stress conditions were obtained using an adaptation method. The adaptation involved continuously growing xylose utilizing Zymomonas in media containing high sugars, acetic acid, ammonia, and ethanol.

  3. Stress distribution and development within geosynthetic-reinforced soil slopes

    E-Print Network [OSTI]

    Zornberg, Jorge G.

    September 2011, accepted 2 December 2011 ABSTRACT: Numerical methods combined with centrifuge tests are used by centrifuge tests of two GRS slopes with different backfill densities. Numerical results indicate that soil, Centrifuge test REFERENCE: Yang, K.-H., Zornberg, J. G., Liu, C.-N. & Lin, H.-D. (2012). Stress distribution

  4. Micromachined Nickel Floating Element Shear Stress Sensor Array , J. Gallmanb

    E-Print Network [OSTI]

    White, Robert D.

    Micromachined Nickel Floating Element Shear Stress Sensor Array Z. Zhaoa , J. Gallmanb , R. Whitea (Technic Copper FB) and patterned lithographically. A Nickel structural layer with varied thickness is deposited from a nickel sulfamate plating solution (Technic Nickel Sulfamate SemiBright) and patterned

  5. Computer aided analysis for residual stress measurement using ultrasonic techniques

    E-Print Network [OSTI]

    Kypa, Jagan Mohan

    1999-01-01T23:59:59.000Z

    to detect travel-times with a precision of 0. l nanoseconds and an accuracy of less than 2.5 nanoseconds. A residual stress reference standard developed for previous research was used as the sample to measure travel-times. The sample was designed...

  6. RESEARCH ARTICLE Impact of water stress on citrus yield

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    October 2011 # INRA and Springer-Verlag, France 2011 Abstract Water shortage is becoming a severe problemRESEARCH ARTICLE Impact of water stress on citrus yield Iván García-Tejero & Victor Hugo Durán in arid and semi-arid regions worldwide, reducing the avail- ability of agricultural land and water

  7. Development of a Longitudinal Rail Stress Measurement Device 

    E-Print Network [OSTI]

    Hurley, Samuel J

    2014-11-12T23:59:59.000Z

    The continuous welded rails used in most of the United States lack expansion joints of any sort. This leads to a much smoother ride and a longer service life for rails and wheels, but also causes extreme temperatures to induce high stresses...

  8. Early stages in the development of stress corrosion cracks

    SciTech Connect (OSTI)

    Jones, R.H.; Simonen, E.P.

    1993-12-01T23:59:59.000Z

    Processes in growth of short cracks and stage I of long stress corrosion cracks were identified and evaluated. There is evidence that electrochemical effects can cause short stress corrosion cracks to grow at rates faster or slower than long cracks. Short cracks can grow at faster rates than long cracks for a salt film dissolution growth mechanism or from reduced oxygen inhibition of hydrolytic acidification. An increasing crack growth rate with increasing crack length could result from a process of increasing crack tip concentration of a critical anion, such as Cl{sup {minus}}, with increasing crack length in a system where the crack velocity is dependent on the Cl{sup {minus}} or some other anion concentration. An increasing potential drop between crack tip and mouth would result in an increased anion concentration at the crack tip and hence an increasing crack velocity. Stage I behavior of long cracks is another early development stage in the life of a stress corrosion crack which is poorly understood. This stage can be described by da/dt = AK{sup m} where da/dt is crack velocity, A is a constant, K is stress intensity and m ranges from 2 to 24 for a variety of materials and environments. Only the salt film dissolution model was found to quantitatively describe this stage; however, the model was only tested on one material and its general applicability is unknown.

  9. acetazolamide stress brain: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    acetazolamide stress brain First Page Previous Page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 Changes in Brain MicroRNAs...

  10. A PROBABILISTIC FINITE ELEMENT ANALYSIS OF RESIDUAL STRESS FORMATION

    E-Print Network [OSTI]

    Grujicic, Mica

    A PROBABILISTIC FINITE ELEMENT ANALYSIS OF RESIDUAL STRESS FORMATION IN SHRINK-FIT CERAMIC shrink fitting of the jacket over the lining is studied using a probabilistic finite element analysis structural analysis approach, known as the Advanced Mean Value (AMV) method, is used which enables

  11. Original article Effects of water stress applied at different phenological

    E-Print Network [OSTI]

    Boyer, Edmond

    - Drought treatments were applied to seven sets of dwarf bean plants in pots. Each was subjected to waterOriginal article Effects of water stress applied at different phenological phases on yield components of dwarf bean (Phaseolus vulgaris L.) Brahim Mouhouche Françoise Rugetb Richard Delécolle a

  12. Shear-induced sedimentation in yield stress fluids Guillaume Ovarlez

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    if a given material will remain ho- mogeneous during a flow. Using MRI techniques, we study the time the local shear rate in the interstitial fluid. Keywords: Sedimentation; Yield stress fluid; Suspension; MRI some lift or dispersion forces to the particles. This principle is typically used in fluidization

  13. air pollution stress: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    air pollution stress First Page Previous Page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 Environmental Pollution Air...

  14. Bauschinger effect and multiaxial yield behavior of stress-reversed mild steel

    SciTech Connect (OSTI)

    Chen, Z.; Maekawa, Syuji; Takeda, Takenobu

    1999-12-01T23:59:59.000Z

    Thin-walled cylindrical specimens subjected to torsional prestraining are stress-reversed along the Bauschinger curve. The Bauschinger effect (BE), yield behavior, and flow behavior of the stress-reversed mild steel were examined by using combined loadings of axial load, internal pressure, and torsion. The results indicate that the stress-reversed steel has the same yield stress as 0.2% offset strain in reloading tests of forward and reverse torsion, when the reverse strain is {bar {epsilon}}{sub 1}{sup p} = 0.77%. Furthermore, it is possible to cause the yield stresses in forward and reverse torsion to coincide in any offset strain. The yield locus of the stress-reversed steel is symmetric with respect to the tensile stress axis in a tension-torsion stress field. However, it has been found to be an anisotropy in the stress-reversed steel, and the magnitude of anisotropy is related to the offset strain. For example, there is a stronger anisotropy at 0.2% offset strain than at 2% offset strain, even though the BE is eliminated for the former. It is shown that the reduction in the BE by stress reversal is concerned with the relief o the long-range back-stress generated by prestraining. Besides, the roles of aging in the stress-aging process lie in the contributions to age hardening and development of directional back-stress.

  15. Analytical Study of Stress State in HTS Solenoids

    SciTech Connect (OSTI)

    Barzi, E.; Terzini, E.; /Fermilab

    2009-01-01T23:59:59.000Z

    A main challenge for high field solenoids made of in High Temperature Superconductor (HTS) is the large stress developed in the conductor. This is especially constraining for BSCCO, a brittle and strain sensitive ceramic material. To find parametric correlations useful in magnet design, analytical models can be used. A simple model is herein proposed to obtain the radial, azimuthal and axial stresses in a solenoid as a function of size, i.e. self-field, and of the engineering current density for a number of different constraint hypotheses. The analytical model was verified against finite element modeling (FEM) using the same hypotheses of infinite rigidity of the constraints and room temperature properties. FEM was used to separately evaluate the effect of thermal contractions at 4.2 K for BSCCO and YBCO coils. Even though the analytical model allows for a finite stiffness of the constraints, it was run using infinite stiffness. For this reason, FEM was again used to determine how much stresses change when considering an outer stainless steel skin with finite rigidity for both BSCCO and YBCO coils. For a better understanding of the actual loads that high field solenoids made of HTS will be subject to, we have started some analytical studies of stress state in solenoids for a number of constraint hypotheses. This will hopefully show what can be achieved with the present conductor in terms of self-field. The magnetic field (B) exerts a force F = B x J per unit volume. In superconducting magnets, where the field and current density (J) are both high, this force can be very large, and it is therefore important to calculate the stresses in the coil.

  16. Initiation stress threshold irradiation assisted stress corrosion cracking criterion assessment for core internals in PWR environment

    SciTech Connect (OSTI)

    Tanguy, Benoit; Stern, Anthony; Bossis, Philippe [CEA, DEN-DMN, Gif-sur-Yvette, (France); Pokor, Cedric [EDF les Renardieres, Moret-sur-Loing, (France)

    2012-07-01T23:59:59.000Z

    Irradiation assisted stress corrosion cracking (IASCC) is a problem of growing importance in pressurized water reactors (PWR). An understanding of the mechanism(s) of IASCC is required in order to provide guidance for the development of mitigation strategies. One of the principal reasons why the IASCC mechanism(s) has been so difficult to understand is the inseparability of the different IASCC potential contributors evolutions due to neutron irradiation. The potential contributors to IASCC in PWR primary water are: (i) radiation induced segregation (RIS) at grain boundaries, (ii) radiation induced microstructure (formation and growth of dislocations loops, voids, bubbles, phases), (iii) localized deformation under loading, (iv) irradiation creep and transmutations. While the development of some of the contributors (RIS, microstructure) with increasing doses are at least qualitatively well understood, the role of these changes on IASCC remains unclear. Parallel to fundamental understanding developments relative to IASCC, well controlled laboratory tests on neutron irradiated stainless steels are needed to assess the main mechanisms and also to establish an engineering criterion relative to the initiation of fracture due to IASCC. First part of this study describes the methodology carried out at CEA in order to provide more experimental data from constant load tests dedicated to the study of initiation of SCC on neutron irradiated stainless steel. A description of the autoclave recirculation loop dedicated to SCC tests on neutron irradiated materials is then given. This autoclave recirculation loop has been started on July 2010 with the first SCC test on an irradiated stainless steel (grade 316) performed at CEA. The main steps of the interrupted SCC tests are then described. Second part of this paper reports the partial results of the first test performed on a highly neutron irradiated material. (authors)

  17. Durational Properties of Lexical Stress and Grammatical Stress in Nanchang Chinese and Their Implications for Tonal Contrasts

    E-Print Network [OSTI]

    Liu, Jiang

    2010-03-11T23:59:59.000Z

    ...................................................................................................................22 3 Experiment-2: Study of tonal contrasts...........................................................................27 3.1 Methodology in the study of tonal contrasts in CV(R) monosyllables.................28 3.2 Methodology in study of tonal... contrasts in CV(R) syllables with and without lexical stress................................................................................................................30 3.2.1 Wordlist design...

  18. Investigating the molecular basis of local adaptation to thermal stress: population differences in gene expression across the transcriptome of the copepod Tigriopus californicus

    E-Print Network [OSTI]

    Schoville, Sean D; Barreto, Felipe S; Moy, Gary W; Wolff, Anastasia; Burton, Ronald S

    2012-01-01T23:59:59.000Z

    GN: Transcriptomic responses to heat stress in invasive andThe cellular response to heat stress in the goby Gillichthysanalysis of the heat stress response in Drosophila

  19. cDNA microarray-based studies of thermal stress-induced bleaching in the Caribbean corals Montastraea faveolata and Acropora palmata

    E-Print Network [OSTI]

    DeSalvo, Michael Kenneth

    2010-01-01T23:59:59.000Z

    Transcriptomic responses to heat stress and bleaching in theTranscriptomic responses to heat stress and bleaching in thetranscriptomic response to heat stress and bleaching in both

  20. Plant Responses of Drip Irrigated Trees to Climate and Water Stress

    E-Print Network [OSTI]

    Punthakey, J. F.; McFarland, M. J.; Rodrigue, P. B.; Worthington, J. W.

    Past irrigation research has shown that peach (prunus persica) trees vary in their field response to water stress, and the degree of stress is a function of the plants' environment. Water deficits reduce plant growth and crop yields, therefore...

  1. Effects of High Dietary Iron and Gamma Radiation on Oxidative Stress and Bone 

    E-Print Network [OSTI]

    Yuen, Evelyn P

    2013-04-19T23:59:59.000Z

    Astronauts in space flight missions are exposed to increased iron (Fe) stores and galactic cosmic radiation, both of which independently induce oxidative stress. Oxidative stress can result in protein, lipid, and DNA oxidation. Recent evidence has...

  2. Noninvasive detection of the hemodynamic stress of exercise using the photoplethysmogram

    E-Print Network [OSTI]

    Linder, Stephen

    fatigue provide a mechanism for noninvasively detecting hemodynamic stress to the human vascular system; respiratory rate Moderate hemodynamic stress can be detected by moni- toring increases in heart rate, blood

  3. Modeling the relation between suction, effective stress and shear strength in partially saturated granular media

    E-Print Network [OSTI]

    Toker, Nabi Kartal, 1979-

    2007-01-01T23:59:59.000Z

    Decades of geotechnical research firmly established that the mechanical properties (shear strength and deformation characteristics) of soils are related to soil's "effective stress", i.e. the stress carried by the solid ...

  4. Restoration of hippocampal growth hormone reverses stress-induced hippocampal impairment

    E-Print Network [OSTI]

    Vander Weele, Caitlin Miya

    Though growth hormone (GH) is synthesized by hippocampal neurons, where its expression is influenced by stress exposure, its function is poorly characterized. Here, we show that a regimen of chronic stress that impairs ...

  5. Molecular cloning and characterization of important stress and redox regulatory genes from Hydra vulgaris

    E-Print Network [OSTI]

    Dash, Bhagirathi

    2007-04-25T23:59:59.000Z

    In this research, important stress and redox regulatory genes present in Hydra vulgaris were isolated and characterized to facilitate our understanding of the evolution and mechanisms of stress response. H. vulgaris heat shock protein 70 (HvHSP70...

  6. Acrolein induces oxidative stress in brain mitochondria Jian Luo, Riyi Shi*

    E-Print Network [OSTI]

    Shi, Riyi

    Acrolein induces oxidative stress in brain mitochondria Jian Luo, Riyi Shi* Department of Basic 2004 Available online 14 November 2004 Abstract Acrolein, a byproduct of lipid peroxidation, has been demonstrates that acrolein can directly stimulate mitochondrial oxidative stress. Specifically, exposure

  7. Ultrasonic measurement of residual stress relaxation in welded steel plates using critically refracted longitudinal waves

    E-Print Network [OSTI]

    Chance, Brent Houston

    2000-01-01T23:59:59.000Z

    This study investigates whether or not there is a measurable amount of residual transverse stress relaxation in welded steel. This was determined by using two different methods of stress measurement. These methods involved strain gauges...

  8. Silicon micromachined sensors and sensor arrays for shear-stress measurements in aerodynamic flows

    E-Print Network [OSTI]

    Padmanabhan, Aravind

    In this thesis we report on a new micromachined floating-element shear-stress sensor for turbulent boundary layer research. Applications in low shear-stress environments such as turbulent boundary layers require extremely ...

  9. Increased oxidative stress in barn swallows from the Chernobyl region Andrea Bonisoli-Alquati a,

    E-Print Network [OSTI]

    Mousseau, Timothy A.

    Increased oxidative stress in barn swallows from the Chernobyl region Andrea Bonisoli-Alquati a Available online 5 November 2009 Keywords: Antioxidant capacity Barn swallow Chernobyl Oxidative stress Radioactive contamination Reactive oxygen species The Chernobyl nuclear accident produced the largest

  10. Influence of electrode stress on proton exchange membrane fuel cell performance : experimental characterization and power optimization

    E-Print Network [OSTI]

    Gallant, Betar M. (Betar Maurkah)

    2008-01-01T23:59:59.000Z

    Compressive stress applied to the electrode area of a Proton Exchange Membrane (PEM) fuel cell is known to significantly affect power output. In practice, electrode stress arises during operation due to the clamping force ...

  11. Metabolism in orange fruits is driven by photooxidative stress in the leaves Florine Poiroux-Gonorda

    E-Print Network [OSTI]

    Boyer, Edmond

    this article as doi: 10.1111/ppl.12023 © 2013 Scandinavian Plant Physiology Society, ISSN 0031-9317 hal.1111/ppl.12023 #12;In plants, stress signals propagate to trigger distant responses and thus stress

  12. Salt stress affects polyamine concentrations and plasma membrane H+-ATPase proton pumping in maize

    E-Print Network [OSTI]

    Ingold, Mariko; Hanstein, Stefan; Schubert, Sven

    2009-01-01T23:59:59.000Z

    during the first phase of salt stress? J. Plant Nutr. SoilH + -ATPase in roots, is lowered by salt treatment.synthesis of polyamines under salt stress may contribute to

  13. The stress field around two parallel edge cracks in a finite body

    E-Print Network [OSTI]

    Hardin, Patrick Wayne

    1993-01-01T23:59:59.000Z

    The goal of this research was to develop a method to represent and analyze the stress field surrounding two edge cracks located in a finite body. The generalized Westergaard equations were utilized to represent the independent stress fields created...

  14. Step-Stress Accelerated Degradation Testing (SSADT) for Photovoltaic (PV) Devices and Cells (Presentation)

    SciTech Connect (OSTI)

    Lee, J.; Elmore, R.; Suh, C.; Jones, W.

    2010-10-01T23:59:59.000Z

    Presentation on step-stress accelerated degradation testing (SSADT) for photovoltaics (PV). Developed are a step-stress degradation test (SSADT) for PV reliability tests and a lifetime prediction model for PV products.

  15. B-DNA Under Stress: Over- and Untwisting of DNA during MolecularDynami...

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    B-DNA Under Stress: Over- and Untwisting of DNA during MolecularDynamics Simulations. B-DNA Under Stress: Over- and Untwisting of DNA during MolecularDynamics Simulations....

  16. Ultrasonic measurement of residual stress relaxation in welded steel plates using critically refracted longitudinal waves 

    E-Print Network [OSTI]

    Chance, Brent Houston

    2000-01-01T23:59:59.000Z

    This study investigates whether or not there is a measurable amount of residual transverse stress relaxation in welded steel. This was determined by using two different methods of stress measurement. These methods involved strain gauges...

  17. A Role for Repressive Histone Methylation in Cocaine-Induced Vulnerability to Stress

    E-Print Network [OSTI]

    Covington, Herbert E.

    Substance abuse increases an individual's vulnerability to stress-related illnesses, which is presumably mediated by drug-induced neural adaptations that alter subsequent responses to stress. Here, we identify repressive ...

  18. Determination of applied stresses in rails using the acoustoelastic effect of ultrasonic waves

    E-Print Network [OSTI]

    Gokhale, Shailesh Ashok

    2008-10-10T23:59:59.000Z

    This research develops a procedure to determine the applied stresses in rails using the acoustoelastic effect of ultrasonic waves. Acoustoelasticity is defined as the stress dependency of ultrasonic wave speed or wave polarization. Analytical models...

  19. Determination of applied stresses in rails using the acoustoelastic effect of ultrasonic waves

    E-Print Network [OSTI]

    Gokhale, Shailesh Ashok

    2009-05-15T23:59:59.000Z

    This research develops a procedure to determine the applied stresses in rails using the acoustoelastic effect of ultrasonic waves. Acoustoelasticity is defined as the stress dependency of ultrasonic wave speed or wave polarization. Analytical models...

  20. Residual stress and self-assembly during deposition and etching of MEMS 

    E-Print Network [OSTI]

    Mani, Sathyanarayanan

    2002-01-01T23:59:59.000Z

    General relations are provided for the work rate and complementary work rate on a body containing evolving boundaries, residual stresses, and stresses due to boundary tractions. Closed-form solutions are provided for three simple examples...

  1. Gender differences in psychopathology examined under an expanded transactional theory of stress framework

    E-Print Network [OSTI]

    Lee, Jillian April

    2009-05-15T23:59:59.000Z

    – and examines gender differences within a transactional theory of stress that takes into account levels of cognitive processing (an expanded transactional theory of stress). Both studies found that men are more physiologically reactive to disorder...

  2. Stress-dependent permeability of fractured rock masses: A numerical study

    SciTech Connect (OSTI)

    Min, Ki-Bok; Rutqvist, J.; Tsang, Chin-Fu; Jing, Lanru

    2004-04-30T23:59:59.000Z

    We investigate the stress-dependent permeability issue in fractured rock masses considering the effects of nonlinear normal deformation and shear dilation of fractures using a two-dimensional distinct element method program, UDEC, based on a realistic discrete fracture network realization. A series of ''numerical'' experiments were conducted to calculate changes in the permeability of simulated fractured rock masses under various loading conditions. Numerical experiments were conducted in two ways: (1) increasing the overall stresses with a fixed ratio of horizontal to vertical stresses components; and (2) increasing the differential stresses (i.e., the difference between the horizontal and vertical stresses) while keeping the magnitude of vertical stress constant. These numerical experiments show that the permeability of fractured rocks decreases with increased stress magnitudes when the stress ratio is not large enough to cause shear dilation of fractures, whereas permeability increases with increased stress when the stress ratio is large enough. Permeability changes at low stress levels are more sensitive than at high stress levels due to the nonlinear fracture normal stress-displacement relation. Significant stress-induced channeling is observed as the shear dilation causes the concentration of fluid flow along connected shear fractures. Anisotropy of permeability emerges with the increase of differential stresses, and this anisotropy can become more prominent with the influence of shear dilation and localized flow paths. A set of empirical equations in closed-form, accounting for both normal closure and shear dilation of the fractures, is proposed to model the stress-dependent permeability. These equations prove to be in good agreement with the results obtained from our numerical experiments.

  3. Pre-Stressed Viscoelastic Composites: Effective Incremental Moduli and Band-Gap Tuning

    SciTech Connect (OSTI)

    Parnell, William J. [School of Mathematics, Alan Turing Building, University of Manchester, Manchester, M13 9PL (United Kingdom)

    2010-09-30T23:59:59.000Z

    We study viscoelastic wave propagation along pre-stressed nonlinear elastic composite bars. In the pre-stressed state we derive explicit forms for the effective incremental storage and loss moduli with dependence on the pre-stress. We also derive a dispersion relation for the effective wavenumber in the case of arbitrary frequency, hence permitting a study of viscoelastic band-gap tuning via pre-stress.

  4. Effects of repetitive stressing on the strength and deformation of an angular, coarse sand

    E-Print Network [OSTI]

    Dillon, Larry Albert

    1962-01-01T23:59:59.000Z

    III SOIL USED IN INVESTIGATION IV TESTING PROCEDURES AND EQUIPMENT Repeated Loading Unit and Tests Recording of Rate of Stress Application Triaxiai Compression Cell and Tests V RESULTS Deflection Histories Stress Versus Strain Relationships... from Shear Tests on Sand b. Results of Shear Tests on Sand 2. Effect of Repeated Ioading on Stress Versus Deformation Relationship of Silty Clay 3. Typical Stress Versus Strain Relationship fox Repeated Application of Compressive Load to Soil...

  5. Stress-specific signatures: expression profiling of p53 wild-type and -null human cells

    E-Print Network [OSTI]

    stress on the protein folding apparatus of the cell, and results in the induction of molecular chaperones

  6. Effect of external stress on moisture diffusion in an epoxy resin and its composite material 

    E-Print Network [OSTI]

    Henson, Michael Chamberlain

    1986-01-01T23:59:59.000Z

    ) Michael Chamberlain Henson, B. S. , Texas A&N University Chairman of Advisory Comnittee: Dr. Y. Weitsman The effects of stress on moisture diffusion in a graphite epoxy composrte material have been studied experimentally by examining the correspondrng... diffusion at all stress levels while the graphite epoxy generated results indicative of Non-Fickean, . concentration dependent diffusion at different levels of stress. The external stress affected both materials in a similar manner, causing...

  7. SIMULATION OF STRESSES DURING CASTING OF BINARY MAGNESIUM-ALUMINUM ALLOYS M.G. Pokorny1

    E-Print Network [OSTI]

    Beckermann, Christoph

    SIMULATION OF STRESSES DURING CASTING OF BINARY MAGNESIUM-ALUMINUM ALLOYS M.G. Pokorny1 , C, Geesthacht, Germany Keywords: Magnesium Alloys, Casting, Stress Simulation Abstract A visco-plastic deformation model is used to predict thermal stresses during casting of binary Mg-Al alloys. The predictions

  8. Adaptive Evolution of a Stress Response Protein Tom J. Little1

    E-Print Network [OSTI]

    Obbard, Darren

    Stress responses classically involve heat shock proteins or molecular chaperones that maintain proteinAdaptive Evolution of a Stress Response Protein Tom J. Little1 *, Lenny Nelson2 , Ted Hupp2 1 of the mammalian stress response gene SEP53, a member of the epidermal differentiation complex fused-gene family

  9. CHRONIC HEAT STRESS AND PRENATAL DEVELOPMENT IN SHEEP: II. PLACENTAL CELLULARITY AND METABOLISM'J

    E-Print Network [OSTI]

    Vatnick, Itzick

    CHRONIC HEAT STRESS AND PRENATAL DEVELOPMENT IN SHEEP: II. PLACENTAL CELLULARITY AND METABOLISM'J R (Mode, 1954, Shelton, 1964; Alexander and Williams,1971). The mechanism by which heat stress affects tissue metabolism and development during heat stress. Therefore, it was the intention of the present

  10. Functional analysis of oxidative stress-activated mitogen-activated protein kinase cascade

    E-Print Network [OSTI]

    Sheen, Jen

    -changing environment. A common plant response to different abiotic and biotic stresses, such as heat, chillingFunctional analysis of oxidative stress-activated mitogen-activated protein kinase cascade for review December 1, 1999) Despite the recognition of H2O2 as a central signaling molecule in stress

  11. Thermal Preconditioning and Heat-Shock Protein 72 Preserve Synaptic Transmission during Thermal Stress

    E-Print Network [OSTI]

    Robertson, Meldrum

    , exposing the mammalian CNS to nonle- thal heat stress (i.e., thermal preconditioning) increases levels of heat-shock proteins (Hsps) such as Hsp70 and enhances the viability of neurons under subsequent stress., 2000). Among other mechanisms, precondi- tioning involves stress or heat-shock proteins (Hsps

  12. Using Uncertainty Analysis to Guide the Development of Accelerated Stress Tests (Presentation)

    SciTech Connect (OSTI)

    Kempe, M.

    2014-03-01T23:59:59.000Z

    Extrapolation of accelerated testing to the long-term results expected in the field has uncertainty associated with the acceleration factors and the range of possible stresses in the field. When multiple stresses (such as temperature and humidity) can be used to increase the acceleration, the uncertainty may be reduced according to which stress factors are used to accelerate the degradation.

  13. Temperature dependence of the surface free energy and surface stress: An atomistic calculation for Cu(110)

    E-Print Network [OSTI]

    Mishin, Yuri

    Temperature dependence of the surface free energy and surface stress: An atomistic calculation a method to deduce the free energies and stresses of plane surfaces and solid-liquid interfaces work on anisotropy of surface/interface free energies and stresses, and on the extension of this method

  14. Stress (Tako-Tsubo) Cardiomyopathy Following Radiofrequency Ablation of a Liver Tumor: A Case Report

    SciTech Connect (OSTI)

    Joo, Ijin; Lee, Jeong Min, E-mail: jmsh@snu.ac.kr; Han, Joon Koo; Choi, Byung Ihn; Park, Eun-Ah [Seoul National University College of Medicine, Department of Radiology, and Institute of Radiation Medicine (Korea, Republic of)

    2011-02-15T23:59:59.000Z

    Stress cardiomyopathy is characterized by transient left ventricular dysfunction occurring in the absence of obstructive coronary disease. It is precipitated by acute emotional or physical stress. We present a case of stress cardiomyopathy which developed during hepatic radiofrequency ablation of hepatocellular carcinoma.

  15. Passive film-induced stress and mechanical properties of a-Ti in methanol solution

    E-Print Network [OSTI]

    Volinsky, Alex A.

    Passive film-induced stress and mechanical properties of a-Ti in methanol solution Zhi Qin and film mechanical properties on a-Ti in methanol solution with varying water content was investigated. Film-induced stress in the methanol solution was measured by the flow stress differential method

  16. How Permeability Depends on Stress and Pore Pressure in Coalbeds: A New Model

    E-Print Network [OSTI]

    pressure falloff and matrix shrinkage because of gas desorption together in one equation. The matrixHow Permeability Depends on Stress and Pore Pressure in Coalbeds: A New Model Ian Palmer, SPE, permeability is sensitive to changes in stress or pore pressure (i.e., changes in effective stress). This paper

  17. OIKOS 94: 228235. Copenhagen 2001 Suitability of stressed and vigorous plants to various insect

    E-Print Network [OSTI]

    Inbar, Moshe

    OIKOS 94: 228­235. Copenhagen 2001 Suitability of stressed and vigorous plants to various insect. Suitability of stressed and vigorous plants to various insect herbivores. ­ Oikos 94: 228­235. We conducted a controlled experiment to test the plant vigor and the plant stress hypotheses. The two hypotheses associate

  18. STEADY-STATE CIRCULATIONS FORCED BY DIABATIC HEATING AND WIND STRESS IN THE INTERTROPICAL CONVERGENCE ZONE

    E-Print Network [OSTI]

    Schubert, Wayne H.

    THESIS STEADY-STATE CIRCULATIONS FORCED BY DIABATIC HEATING AND WIND STRESS IN THE INTERTROPICAL-STATE CIRCULATIONS FORCED BY DIABATIC HEATING AND WIND STRESS IN THE INTERTROPICAL CONVERGENCE ZONE A number. The model is forced by prescribed diabatic heating and boundary layer wind stress curl. The circulations

  19. The effect of various states of stress on the permeability of Berea sandstone

    E-Print Network [OSTI]

    Gatto, Henrietta G

    1984-01-01T23:59:59.000Z

    . . EXPERIMENTAL PROCEDURES. Rock Samples. Specimen Preparation. Triaxial Apparatus. Permeability Measurements. Data Reduction. Performance of the Tests. TEST RESULTS. Hydrostatic Stress Conditions. Triaxial Test Results; Stress vs. Permeability.... . Uniaxial Strain Data Triaxial Test Results; Stress-Strain Data. . . . . . . Observational Results. . . . . . . . . . . . . . . . . , . . . . . . . . . DISCUSSION. Whole Rock Permeability. Fracture (Pre-cut Specimen) Permeability. . . Significance...

  20. 2010 MICROBIAL STRESS RESPONSE GORDON RESEARCH CONFERENCE, JULY 18-23, 2010

    SciTech Connect (OSTI)

    Sarah Ades

    2011-07-23T23:59:59.000Z

    The 2010 Gordon Research Conference on Microbial Stress Responses provides an open and exciting forum for the exchange of scientific discoveries on the remarkable mechanisms used by microbes to survive in nearly every niche on the planet. Understanding these stress responses is critical for our ability to control microbial survival, whether in the context of biotechnology, ecology, or pathogenesis. From its inception in 1994, this conference has traditionally employed a very broad definition of stress in microbial systems. Sessions will cover the major steps of stress responses from signal sensing to transcriptional regulation to the effectors that mediate responses. A wide range of stresses will be represented. Some examples include (but are not limited to) oxidative stress, protein quality control, antibiotic-induced stress and survival, envelope stress, DNA damage, and nutritional stress. The 2010 meeting will also focus on the role of stress responses in microbial communities, applied and environmental microbiology, and microbial development. This conference brings together researchers from both the biological and physical sciences investigating stress responses in medically- and environmentally relevant microbes, as well as model organisms, using cutting-edge techniques. Computational, systems-level, and biophysical approaches to exploring stress responsive circuits will be integrated throughout the sessions alongside the more traditional molecular, physiological, and genetic approaches. The broad range of excellent speakers and topics, together with the intimate and pleasant setting at Mount Holyoke College, provide a fertile ground for the exchange of new ideas and approaches.

  1. STRESS-DENSITY VARIATIONS IN ALUMINA SEDIMENTS: EFFECTS OF POLYMER CHEMISTRY

    E-Print Network [OSTI]

    Aksay, Ilhan A.

    rearrangement into densely packed structures. Polysiloxanes are excellent lubricants (e.g., silicon oil) due151 STRESS-DENSITY VARIATIONS IN ALUMINA SEDIMENTS: EFFECTS OF POLYMER CHEMISTRY C. H. SCHILLING) the magnitude of the effective stresses (i.e., stresses that are supported by the particulate network) and (ii

  2. Global identification of miRNAs and targets in Populus euphratica under salt stress

    E-Print Network [OSTI]

    Deng, Xing-Wang

    Global identification of miRNAs and targets in Populus euphratica under salt stress Bosheng Li, a typical hydro-halophyte, is ideal for studying salt stress responses in woody plants. MicroRNAs (miRNA may regulate tolerance to salt stress but this has not been widely studied in P. euphratica

  3. Microstructure, residual stress, and fracture of sputtered TiN films Liqiang Zhang a

    E-Print Network [OSTI]

    Volinsky, Alex A.

    Microstructure, residual stress, and fracture of sputtered TiN films Liqiang Zhang a , Huisheng Keywords: TiN films Residual stress Hardness Fracture toughness Morphology, structure, residual stress, hardness, and fracture toughness of magnetron sputtered titanium nitride (TiN) thin films, deposited at 300

  4. THE EFFECT OF SNOWPACK WARMING ON THE STRESS BULB BELOW A SKIER Thomas Exner *

    E-Print Network [OSTI]

    Jamieson, Bruce

    THE EFFECT OF SNOWPACK WARMING ON THE STRESS BULB BELOW A SKIER Thomas Exner * Dept. of Geoscience exist to quantify or validate the temperature effect on the stress bulb below a skier. In this study we periods. Increasing temperatures of the near-surface layers altered the shape of the stress bulb, but so

  5. Overpressure prediction by mean total stress estimate using well logs for compressional environments with strike-slip or reverse faulting stress state

    E-Print Network [OSTI]

    Ozkale, Aslihan

    2007-04-25T23:59:59.000Z

    OVERPRESSURE PREDICTION BY MEAN TOTAL STRESS ESTIMATE USING WELL LOGS FOR COMPRESSIONAL ENVIRONMENTS WITH STRIKE-SLIP OR REVERSE FAULTING STRESS STATE A Thesis by ASLIHAN OZKALE Submitted to the Office of Graduate Studies... of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE December 2006 Major Subject: Petroleum Engineering OVERPRESSURE PREDICTION BY MEAN TOTAL STRESS ESTIMATE USING WELL LOGS...

  6. Uncertainty in the maximum principal stress estimated from hydraulic fracturing Measurements due to the presence of the induced fracture

    E-Print Network [OSTI]

    Rutqvist, Jonny; Tsang, Chin-fu; Stephansson, Ove

    2000-01-01T23:59:59.000Z

    reopening during hydraulic fracturing stress determinations.Laboratory study of hydraulic fracturing pressure data?Howevaluation of hydraulic fracturing stress measurement

  7. Prevalence of Job Stress, General Health Profile and Hypertension among Professionals in the Information Technology Sector in Bengaluru, India

    E-Print Network [OSTI]

    Rathnaiah Babu, Giridhara

    2012-01-01T23:59:59.000Z

    III. Systematic Review: Job stress and hypertension: AReferences vi! Chapter.4: Job stressors and Hypertension inSA, Koeske RD. Coping with job stress: Which strategies work

  8. Das Prsidium Abgabe von Gerten

    E-Print Network [OSTI]

    Nejdl, Wolfgang

    . Gebäudetechnik- hat folgendes Gerät abzugeben: - Computer Cat System SN Condat Datensysteme GmbH Einzelteile z Betriebssystem, ohne Software - 2 Desktop-PC: CPU AMD Sempron 2600+, 1 GB RAM, 160 GB HDD, Midi-Tower, ohne GB HDD, Midi-Tower, ohne Betriebssystem, ohne Software - 1 Desktop-PC Fujitsu-Siemens Scaleo 600p: P4

  9. Carl von Ossietzky Universitat Oldenburg

    E-Print Network [OSTI]

    Peinke, Joachim

    in the frequency domain by a progammable liquid crystal display spatial light modulator (LCD-SLM) in an optical.5G. With the average supercontinuum power of 4 W a solar cell of up to 6.75 mm2 (at AM0) can be illuminated at a power of 1 kW/m2 - thus one sun, which provides an interesting perspective for testing solar

  10. Slow stress relaxation in randomly disordered nematic elastomers and gels

    E-Print Network [OSTI]

    S. M. Clarke; E. M. Terentjev

    1998-05-28T23:59:59.000Z

    Randomly disordered (polydomain) liquid crystalline elastomers align under stress. We study the dynamics of stress relaxation before, during and after the Polydomain-Monodomain transition. The results for different materials show the universal ultra-slow logarithmic behaviour, especially pronounced in the region of the transition. The data is approximated very well by an equation Sigma(t) ~ Sigma_{eq} + A/(1+ Alpha Log[t]). We propose a theoretical model based on the concept of cooperative mechanical resistance for the re-orientation of each domain, attempting to follow the soft-deformation pathway. The exact model solution can be approximated by compact analytical expressions valid at short and at long times of relaxation, with two model parameters determined from the data.

  11. Stress analysis of closure bolts for shipping casks

    SciTech Connect (OSTI)

    Mok, G.C.; Fischer, L.E. (Lawrence Livermore National Lab., CA (United States)); Hsu, S.T. (Kaiser Engineers, Oakland, CA (United States))

    1993-01-01T23:59:59.000Z

    This report specifies the requirements and criteria for stress analysis of closure bolts for shipping casks containing nuclear spent fuels or high level radioactive materials. The specification is based on existing information conceming the structural behavior, analysis, and design of bolted joints. The approach taken was to extend the ASME Boiler and Pressure Vessel Code requirements and criteria for bolting analysis of nuclear piping and pressure vessels to include the appropriate design and load characteristics of the shipping cask. The characteristics considered are large, flat, closure lids with metal-to-metal contact within the bolted joint; significant temperature and impact loads; and possible prying and bending effects. Specific formulas and procedures developed apply to the bolt stress analysis of a circular, flat, bolted closure. The report also includes critical load cases and desirable design practices for the bolted closure, an in-depth review of the structural behavior of bolted joints, and a comprehensive bibliography of current information on bolted joints.

  12. Local contact stress measurements at a rough interface

    E-Print Network [OSTI]

    J. Scheibert; A. Prevost; J. Frelat; P. Rey; G. Debrégeas

    2007-11-07T23:59:59.000Z

    An original MEMS-based force sensing device is designed which allows to measure spatially resolved normal and tangential stress fields at the base of an elastomeric film. This device is used for the study of the contact stress between a rough film and a smooth glass sphere under normal load. The measured profiles are compared to Finite Elements Method calculations for a smooth contact with boundary conditions obeying Amontons-Coulomb's friction law. The accuracy of the measurements allows to discriminate between dry and lubricated contact conditions and to evidence load-dependent deviations from Amontons-Coulomb's profiles. These deviations are qualitatively interpreted by taking into account the finite compliance of the micro-contact population.

  13. Protein structure and hydration probed by SANS and osmotic stress

    SciTech Connect (OSTI)

    Rau, Dr. Donald [National Institutes of Health

    2008-01-01T23:59:59.000Z

    Interactions governing protein folding, stability, recognition, and activity are mediated by hydration. Here, we use small-angle neutron scattering coupled with osmotic stress to investigate the hydration of two proteins, lysozyme and guanylate kinase (GK), in the presence of solutes. By taking advantage of the neutron contrast variation that occurs upon addition of these solutes, the number of protein-associated (solute-excluded) water molecules can be estimated from changes in both the zero-angle scattering intensity and the radius of gyration. Poly(ethylene glycol) exclusion varies with molecular weight. This sensitivity can be exploited to probe structural features such as the large internal GK cavity. For GK, small-angle neutron scattering is complemented by isothermal titration calorimetry with osmoticstress to also measure hydration changes accompanying ligand binding. These results provide a framework for studying other biomolecular systems and assemblies using neutron scattering together with osmotic stress.

  14. Parental loss, stress, and cognitive vulnerability factors in depression

    E-Print Network [OSTI]

    Scott, James Glenn

    1988-01-01T23:59:59.000Z

    to which environmental stimuli make these cognitive patterns salient. This priming effect is seen as contributing to the effect of negative cognitions in producing depressive symptoms. Research consistent with this notion has been conducted by Olinger.... This evidence supports previous research findings which demonstrate higher rates of stereotypical negative thought patterns in depressed individuals (Kuiper, Olinger, MacDonald and Shaw, 1985, Beck, 1976). Evidence supporting the effect of stress...

  15. Stress in Adults after a Disaster: Warning Signs and Management

    E-Print Network [OSTI]

    Warren, Judith L.

    2005-09-30T23:59:59.000Z

    there with that person during the crisis. Increased substance abuse ? In stressful situations, some adults abuse al- cohol or other substances. Such behavior may lead to further problems at home and at work. Physical symptoms ? Adults who report physical symptoms... leaving home for fear that something terrible will happen again, or they may feel shame over their emotional reactions. There also are those who may not want to leave their family members alone so they can protect them from another pos- sible disaster...

  16. Direct measurement of yield stress of discrete materials

    E-Print Network [OSTI]

    S. H. Ebrahimnazhad Rahbari; J. Vollmer; S. Herminghaus; M. Brinkmann

    2012-06-09T23:59:59.000Z

    We present a novel computational method for direct measurement of yield stress of discrete materials. The method is well-suited for the measurement of jamming phase diagram of a wide range of discrete particle systems such as granular materials, foams, and colloids. We further successfully apply the method to evaluate the jamming phase diagram of wet granular material in order to demonstrates the applicability of the model.

  17. Microorganisms having enhanced tolerance to inhibitors and stress

    DOE Patents [OSTI]

    Brown, Steven D.; Yang, Shihui

    2014-07-29T23:59:59.000Z

    The present invention provides genetically modified strains of microorganisms that display enhanced tolerance to stress and/or inhibitors such as sodium acetate and vanillin. The enhanced tolerance can be achieved by increasing the expression of a protein of the Sm-like superfamily such as a bacterial Hfq protein and a fungal Sm or Lsm protein. Further, the present invention provides methods of producing alcohol from biomass materials by using the genetically modified microorganisms of the present invention.

  18. Nondestructive testing using stress waves: wave propagation in layered media

    E-Print Network [OSTI]

    Ortega, Jose Alberto

    2013-02-22T23:59:59.000Z

    NONDESTRUCTIVE TESTING USING STRESS WAVES: WAVE PROPAGATION IN LAYERED MEDIA A Senior Honors Thesis by JOSE ALBERTO ORTEGA Submitted to the Office of Honors Program & Academic Scholarships Texas A&M University in partial fulfillment... of the requirement of the UNIVERSITY UNDERGRADUATE RESEARCH FELLOWS April 2002 Group: Engineering NONDESTRUCTIVE TESTING USI WAVE PROPAGATION IN LA A Senior Honors The ~pe -C JOSE ALBERTO ORTI /CI Submitted to the Office of Honors Program k. Academic...

  19. Use of Cosserat birefringence to measurement couple stresses by photoelasticity

    SciTech Connect (OSTI)

    Marek, Siko? [Faculty of Mechanics, Institute of Machine Design, Cracow University of Technology, Jana Pawla II, 37, 31-866 Cracow (Poland)

    2014-05-27T23:59:59.000Z

    The quantum analysis of the polar atom under the action of a mechanical load is presented in this work. The obtained solution can be used to describe the optical properties of the Cosserat medium in the form of the gyro-birefringence. Rayleigh scattering of laser light coming towards the Cosserat medium head is analysed to measure the rotation of the azimuth of polarisation associated with couple stresses.

  20. Effect of 1-MCP on Cotton Plants Under Abiotic Stress

    E-Print Network [OSTI]

    Chen, Yuan

    2013-05-06T23:59:59.000Z

    and environmental signals (Gan and Amasino, 1997; Pierik et al., 2007; Young et al., 2004). When ethylene function was blocked, lower electrolyte leakage was detected, indicating delayed senescence in flower petals (Faragher et al., 1987; Sisler et al., 1996... drought stress in controlled environment; 3) optimize the electrolyte leakage method for analyzing the effect of 1-MCP on cotton and test the effect of 1-MCP concentration, inducing time, and leaf positions on 1-MCP treated cotton plants...

  1. Stress localization, stiffening and yielding in a model colloidal gel

    E-Print Network [OSTI]

    Jader Colombo; Emanuela Del Gado

    2014-06-16T23:59:59.000Z

    We use numerical simulations and an athermal quasi-static shear protocol to investigate the yielding of a model colloidal gel. Under increasing deformation, the elastic regime is followed by a significant stiffening before yielding takes place. A space-resolved analysis of deformations and stresses unravel how the complex load curve observed is the result of stress localization and that the yielding can take place by breaking a very small fraction of the network connections. The stiffening corresponds to the stretching of the network chains, unbent and aligned along the direction of maximum extension. It is characterized by a strong localization of tensile stresses, that triggers the breaking of a few network nodes at around 30% of strain. Increasing deformation favors further breaking but also shear-induced bonding, eventually leading to a large-scale reorganization of the gel structure at the yielding. At low enough shear rates, density and velocity profiles display significant spatial inhomogeneity during yielding in agreement with experimental observations.

  2. Calculations of dynamic stresses in the envelopes of pulsed Xe flashlamps

    SciTech Connect (OSTI)

    Holdener, F.R.; Platt, E.A.; Erlandson, A.C.; Frank, D.N.; Gelinas, R.J.; Jancaitis, K.S.; Larson, D.W.; Sinz, K.H.

    1992-08-31T23:59:59.000Z

    We have modeled dynamic stresses in the envelopes of pulsed xenon flashlamps, treating stresses produced by three different sources: the heating of the envelope by the plasma; the pressure rise of the xenon gas; and magnetic forces, due to currents flowing in nearby lamps. The heat-induced stresses were calculated by the finite element method, using uniform heating rates for the inside surface of the envelope that were inferred from flashlamp radiant efficiency measurements. Pressure-induced stresses were calculated analytically, using empirical relationships for temperature and pressure in terms of current density. Magnetically-induced stresses were also calculated analytically, for flashlamps packed parallel to each other in linear arrays.

  3. Thermal stress analysis of fused-cast AZS refractories during production; Part 2: Development of thermo-elastic stress model

    SciTech Connect (OSTI)

    Cockcroft, S.L.; Brimacombe, J.K. (Univ. of British Columbia, Vancouver, British Columbia (Canada). Centre for Metallurgical Process Engineering); Walrod, D.G.; Myles, T.A. (Carborundum Co., Falconer, NY (United States). Monofrax-S Plant)

    1994-06-01T23:59:59.000Z

    Mathematical models of heat flow and thermo-elastic stress, based on the finite-element method, have been developed and utilized to analyze the voidless,'' fused-cast, AZS, solidification process. The results of the mathematical analysis, in conjunction with information obtained in a comprehensive industrial study, presented in Part 1 of this paper, describe the mechanisms for the formation of the various crack types found in the fused-cast product. Thermal stresses are generated early in the solidification process by rapid cooling of the refractory surface as it contacts the initially cool mold and later in conjunction with the tetragonal-to-monoclinic phase transformation which occurs in the zirconia component of the AZS refractory. Applying this model, castings were made using a revised mold design. Preliminary results indicate these castings to be free of objectionable transverse cracks.

  4. Stress-tuned conductor-polymer composite for use in sensors

    DOE Patents [OSTI]

    Martin, James E; Read, Douglas H

    2013-10-22T23:59:59.000Z

    A method for making a composite polymeric material with electrical conductivity determined by stress-tuning of the conductor-polymer composite, and sensors made with the stress-tuned conductor-polymer composite made by this method. Stress tuning is achieved by mixing a miscible liquid into the polymer precursor solution or by absorbing into the precursor solution a soluble compound from vapor in contact with the polymer precursor solution. The conductor may or may not be ordered by application of a magnetic field. The composite is formed by polymerization with the stress-tuning agent in the polymer matrix. The stress-tuning agent is removed following polymerization to produce a conductor-polymer composite with a stress field that depends on the amount of stress-tuning agent employed.

  5. Numerical and experimental study of the thermal stress of silicon induced by a millisecond laser

    SciTech Connect (OSTI)

    Wang Xi; Qin Yuan; Wang Bin; Zhang Liang; Shen Zhonghua; Lu Jian; Ni Xiaowu

    2011-07-20T23:59:59.000Z

    A spatial axisymmetric finite element model of single-crystal silicon irradiated by a 1064 nm millisecond laser is used to investigate the thermal stress damage induced by a millisecond laser. The transient temperature field and the thermal stress field for 2 ms laser irradiation with a laser fluence of 254 J/cm{sup 2} are obtained. The numerical simulation results indicate that the hoop stresses along the r axis on the front surface are compressive stress within the laser spot and convert to tensile stress outside the laser spot, while the radial stresses along the r axis on the front surface and on the z axis are compressive stress. The temperature of the irradiated center is the highest temperature obtained, yet the stress is not always highest during laser irradiation. At the end of the laser irradiation, the maximal hoop stress is located at r=0.5 mm and the maximal radial stress is located at r=0.76 mm. The temperature measurement experiments are performed by IR pyrometer. The numerical result of the temperature field is consistent with the experimental result. The damage morphologies of silicon under the action of a 254 J/cm{sup 2} laser are inspected by optical microscope. The cracks are observed initiating at r=0.5 mm and extending along the radial direction.

  6. Oxidation induced stress-rupture of fiber bundles

    SciTech Connect (OSTI)

    Lara-Curzio, E.

    1997-03-01T23:59:59.000Z

    The effect of oxidation on the stress-rupture behavior of fiber bundles was modeled. It is shown that oxidation-induced fiber strength degradation results in the delayed failure of the associated fiber bundle and that the fiber bundle strength decreases with time as t{sup {minus}1/4}. It is also shown that the temperature dependence of the bundle loss of strength reflects the thermal dependence of the mechanism controlling the oxidation of the fibers. The effect of gauge length on the fiber bundle strength was also analyzed. Numerical examples are presented for the special case of Nicalon{trademark} fibers.

  7. Stresses resulting from compression of bulk cotton lint fibers

    E-Print Network [OSTI]

    Chimbombi, Ezekiel Maswe

    1998-01-01T23:59:59.000Z

    MTS and Anthony's models 43 4. 2 Mean resilient force on the model bale per time FIGURE Page 4. 3 Ansys output of stress state in a compressed cotton bale 4. 4 Ansys output of state of strain in a compressed cotton bale 47 48 4. 5 Nodal forces... compressed bales is important so that it can be handled in the channels of trade (McCaskill and Anthony, 1977). Anthony et al. (1994) reported that the packaging system consists of a battery condenser, lint slide, lint feeder, tramper, bale press, and bale...

  8. Stress Corrosion Crack Detection on HU-25 Guardian Aircraft

    SciTech Connect (OSTI)

    Blackmon, R.; Huffman, J.; Mello, C.W.; Moore, D.G.; Walkington, P.D.

    1999-02-17T23:59:59.000Z

    Several ultrasonic inspection methods were developed at the Federal Aviation Administration's Airworthiness Assurance NDI Validation Center (AANC) to easily and rapidly detect hidden stress corrosion cracks in all vertical windshield posts on the US Coast Guard (USCG) HU-25 Guardian aircraft. The inspection procedure locates cracks as small as 2.0 millimeters emanating from internal fastener holes and determines their length. A test procedure was developed and a baseline assessment of the USCG fleet was conducted. Inspection results on twenty-five aircraft revealed a good correlation with results made during subsequent structural disassembly and visual inspection.

  9. Effects of stress on microstructural evolution during irradiation

    SciTech Connect (OSTI)

    Gelles, D.S. [Pacific Northwest Lab., Richland, VA (United States)

    1992-12-31T23:59:59.000Z

    Many theories have been postulated to describe irradiation creep but few have been supported with microstructural evidence. The purpose of this paper is to review microstructural studies of the effects of stress during irradiation in order to assess the validity of the available irradiation creep theories. Microstructural studies based on high voltage electron, ion, proton and neutron irradiation will be described, with major emphasis placed on interpreting behavior demonstrated in austenitic steels. Special attention will be given to work on fast neutron irradiated Nimonic PE16, a precipitation strengthened superalloy.

  10. Yield criteria for quasibrittle and frictional materials

    E-Print Network [OSTI]

    Davide Bigoni; Andrea Piccolroaz

    2010-10-09T23:59:59.000Z

    A new yield/damage function is proposed for modelling the inelastic behaviour of a broad class of pressure-sensitive, frictional, ductile and brittle-cohesive materials. The yield function allows the possibility of describing a transition between the shape of a yield surface typical of a class of materials to that typical of another class of materals. This is a fundamental key to model the behaviour of materials which become cohesive during hardening (so that the shape of the yield surface evolves from that typical of a granular material to that typical of a dense material), or which decrease cohesion due to damage accumulation. The proposed yield function is shown to agree with a variety of experimental data relative to soil, concrete, rock, metallic and composite powders, metallic foams, porous metals, and polymers. The yield function represents a single, convex and smooth surface in stress space approaching as limit situations well-known criteria and the extreme limits of convexity in the deviatoric plane. The yield function is therefore a generalization of several criteria, including von Mises, Drucker-Prager, Tresca, modified Tresca, Coulomb-Mohr, modified Cam-clay, and --concerning the deviatoric section-- Rankine and Ottosen. Convexity of the function is proved by developing two general propositions relating convexity of the yield surface to convexity of the corresponding function. These propositions are general and therefore may be employed to generate other convex yield functions.

  11. Grain-scale thermoelastic stresses and spatiotemporal temperature gradients on airless bodies, implications for rock breakdown

    E-Print Network [OSTI]

    Molaro, Jamie L; Langer, Steve A

    2015-01-01T23:59:59.000Z

    Thermomechanical processes such as fatigue and shock have been suggested to cause and contribute to rock breakdown on Earth, and on other planetary bodies, particularly airless bodies in the inner solar system. In this study, we modeled grain-scale stresses induced by diurnal temperature variations on simple microstructures made of pyroxene and plagioclase on various solar system bodies. We found that a heterogeneous microstructure on the Moon experiences peak tensile stresses on the order of 100 MPa. The stresses induced are controlled by the coefficient of thermal expansion and Young's modulus of the mineral constituents, and the average stress within the microstructure is determined by relative volume of each mineral. Amplification of stresses occurs at surface-parallel boundaries between adjacent mineral grains and at the tips of pore spaces. We also found that microscopic spatial and temporal surface temperature gradients do not correlate with high stresses, making them inappropriate proxies for investig...

  12. Finite element residual stress analysis of induction heating bended ferritic steel piping

    SciTech Connect (OSTI)

    Kima, Jong Sung [Sunchon National University, 255 Jungang-ro, Sucheon, Jeonnam (Korea, Republic of); Kim, Kyoung-Soo; Oh, Young-Jin; Chang, Hyung-Young; Park, Heung-Bae [KEPCO E and C, Co., Ltd., 188, Kumi-ro, Seongnam, Kyounggi (Korea, Republic of)

    2014-10-06T23:59:59.000Z

    Recently, there is a trend to apply the piping bended by induction heating process to nuclear power plants. Residual stress can be generated due to thermo-mechanical mechanism during the induction heating bending process. It is well-known that the residual stress has important effect on crack initiation and growth. The previous studies have focused on the thickness variation. In part, some studies were performed for residual stress evaluation of the austenitic stainless steel piping bended by induction heating. It is difficult to find the residual stresses of the ferritic steel piping bended by the induction heating. The study assessed the residual stresses of induction heating bended ferriticsteel piping via finite element analysis. As a result, it was identified that high residual stresses are generated on local outersurface region of the induction heating bended ferritic piping.

  13. Phenotypic and genotypic characterization of white maize inbreds, hybrids and synthetics under stress and non-stress environments

    E-Print Network [OSTI]

    Makumbi, Dan

    2006-10-30T23:59:59.000Z

    ……………………………………...……………………………… 94 3.4 Combined analysis of variance and means for grain yield and agronomic traits across low N stress environments……….…………………………………………… 99 3.5 Combined analysis of variance and means for grain yield and agronomic traits across optimal.... They also reported a significant gain of 9.4% for ears per plant and an increase in kernel number per fertile ear in early cycles of selection under drought conditions. Bolaños and Edmeades (1993a) further reported that about 25% of the gains that were...

  14. Optical method for the determination of stress in thin films

    DOE Patents [OSTI]

    Maris, Humphrey J. (Barrington, RI)

    1999-01-01T23:59:59.000Z

    A method and optical system is disclosed for measuring an amount of stress in a film layer disposed over a substrate. The method includes steps of: (A) applying a sequence of optical pump pulses to the film layer, individual ones of said optical pump pulses inducing a propagating strain pulse in the film layer, and for each of the optical pump pulses, applying at least one optical probe pulse, the optical probe pulses being applied with different time delays after the application of the corresponding optical probe pulses; (B) detecting variations in an intensity of a reflection of portions of the optical probe pulses, the variations being due at least in part to the propagation of the strain pulse in the film layer; (C) determining, from the detected intensity variations, a sound velocity in the film layer; and (D) calculating, using the determined sound velocity, the amount of stress in the film layer. In one embodiment of this invention the step of detecting measures a period of an oscillation in the intensity of the reflection of portions of the optical probe pulses, while in another embodiment the step of detecting measures a change in intensity of the reflection of portions of the optical probe pulses and determines a time at which the propagating strain pulse reflects from a boundary of the film layer.

  15. Graphite having improved thermal stress resistance and method of preparation

    DOE Patents [OSTI]

    Kennedy, Charles R. (Oak Ridge, TN)

    1980-01-01T23:59:59.000Z

    An improved method for fabricating a graphite article comprises the steps of impregnating a coke article by first heating the coke article in contact with a thermoplastic pitch at a temperature within the range of 250.degree.-300.degree. C. at a pressure within the range of 200-2000 psig for at least 4-10 hours and then heating said article at a temperature within the range of 450.degree.-485.degree. C. at a pressure of 200-2000 psig for about 16-24 hours to provide an impregnated article; heating the impregnated article for sufficient time to carbonize the impregnant to provide a second coke article, and graphitizing the second coke article. A graphite having improved thermal stress resistance results when the coke to be impregnated contains 1-3 wt.% sulfur and no added puffing inhibitors. An additional improvement in thermal stress resistance is achieved when the second coke article is heated above about 1400.degree. C. at a rate of at least 10.degree. C./minute to a temperature above the puffing temperature.

  16. Mono-textured nanocrystalline thin films with pronounced stress-gradients: On the role of grain boundaries in the stress evolution

    SciTech Connect (OSTI)

    Daniel, R., E-mail: Rostislav.Daniel@unileoben.ac.at; Mitterer, C. [Department of Physical Metallurgy and Materials Testing, Montanuniversität Leoben, Franz-Josef-Strasse 18, 8700 Leoben (Austria); Jäger, E.; Sartory, B. [Materials Center Leoben Forschung GmbH, Leoben (Austria); Todt, J.; Keckes, J. [Department of Materials Physics, Montanuniversität Leoben and Erich Schmid Institute for Materials Science, Austrian Academy of Sciences, Leoben (Austria)

    2014-05-28T23:59:59.000Z

    The origins of residual stress gradients in nanocrystalline thin films, especially the role of grain size and texture gradients, are still not fully understood. In this work, the stress evolution in exemplary nanocrystalline TiN thin films with one and two fiber texture components as well as in homogeneous amorphous SiO{sub x} films is analyzed using wafer curvature as well as laboratory and synchrotron cross-sectional nanobeam X-ray diffraction techniques. The stress evolution across the film thickness is attributed to the evolutionary nature of microstructural development at the individual growth stages. While the effect of the smooth crystallographic texture changes during growth is only of minor importance, as this does not significantly affect the dominant stress formation mechanisms, the change in the grain size accompanied by a change of the volume fraction of grain boundaries plays a decisive role in the stress development across the film thickness. This is demonstrated on the monotextured thin films, where the residual stresses scale with the apparent grain size. These findings are validated also by the investigations of stress profiles in homogeneous amorphous SiO{sub x} films exhibiting no grain boundaries.

  17. Sulfide stress cracking susceptible pipe fittings bought to NACE MR0175

    SciTech Connect (OSTI)

    McIntyre, D.R.; Moore, E.M. Jr. [Saudi Aramco, Dhahran (Saudi Arabia)

    1995-09-01T23:59:59.000Z

    The NACE MR0175 limit of R{sub c} 22 is non-conservative for cold-forged and stress relieved ASTM A234 WPB pipe fittings. Hardness surveys and sulfide stress cracking test results per ASTM G39 and NACE TMO177 Method B are presented. More stringent inspection and a hardness limit of BHN 197 (for cold-forged and stress relieved fittings only) are recommended to rectify this situation.

  18. Experimental study of the residual stress-induced self-assembly of MEMS structures during deposition

    E-Print Network [OSTI]

    Kim, Sang-Hyun

    2005-11-01T23:59:59.000Z

    three layers (b doped Si, Ge, B doped Si) to deform (or ?roll up?) into cylinders with radii of curvature from 0.3 to 2 micrometers. 9 It would be useful if intrinsic stresses could be used to enable a structure to assemble itself during processing... of [29]. 10 II. ANALYTICAL MODELING The possibility of usefully using residual (or intrinsic) stresses as a means of self- assembling MEMS during material deposition is analytically investigated. A. Self-Assembly and Residual Stress Suppose...

  19. Stress and Heat Transfer Analyses for Different Channel Arrangements of PCHE

    SciTech Connect (OSTI)

    Jong B. Lim; Robert G. Shrake; Eung S. Kim; Chang H. Oh

    2008-11-01T23:59:59.000Z

    Stress and heat transfer analyses are being performed on the different channel arrangements of Printed Circuit Heat Exchanger (PCHE) proposed for application of VHTRs using ABAQUS [ABAQUS, 2007] and COMSOL [COMSOL, 2007], respectively. The work is being done to determine the configuration that would result in minimum stress for the same heat performance. This paper discusses the effects of shifting the coolant channels in every other row to reduce stress.

  20. The effects of stress on coalbed reservoir performance, Black Warrior Basin, U.S.A.

    SciTech Connect (OSTI)

    Sparks, D.P.; McLendon, T.H.; Saulsberry, J.L. [and others

    1995-12-31T23:59:59.000Z

    This paper presents the first field scale measurements of in situ stress effects on permeability of coal seams. The importance of these effects on a highly compressible reservoir such as coal is demonstrated by relating permeability and production to stress. Well testing complications and the implications of stress toward exploitation of existing reserves and exploration for new reserves are also discussed. Additionally, comparisons of this paper`s findings to prior theoretical work, core testing, and limited field data are presented.

  1. An investigation of Araldite 6060 as a model material for photoelastic stress analysis

    E-Print Network [OSTI]

    Anderson, Byron Hubert

    1956-01-01T23:59:59.000Z

    of Modulus of Elasticity and Xa? terial Fringe Value at Room Temperature. 28 Stress-Straia Relationship of Araldite at Room Temperature by Various Eethods . . . 29 Central Seotion of the Test Specimen used ia the Determination of Stress-Strain Re...- lationship by the Optical Eethod . . ~ ~ 31 Bausch and Lomb Toolmaker's Eicroscope used to Eeasure Strains in a Test Speci- men iron Photographs . . . . . . . . . ~ 32 Stress-Optic Relationship of Araldite at Room Temperature using a Tension Specimea 36...

  2. The influence of quench sensitivity on residual stresses in the aluminium alloys 7010 and 7075

    SciTech Connect (OSTI)

    Robinson, J.S., E-mail: jeremy.robinson@ul.ie [Materials and Surface Science Institute, University of Limerick (Ireland); Tanner, D.A. [Materials and Surface Science Institute, University of Limerick (Ireland); Truman, C.E. [Department of Mechanical Engineering, University of Bristol (United Kingdom); Paradowska, A.M. [ISIS Facility, Rutherford Appleton Laboratory, Didcot (United Kingdom); Wimpory, R.C. [Helmholtz Centre Berlin for Materials and Energy, Hahn Meitner Platz 1, Berlin (Germany)

    2012-03-15T23:59:59.000Z

    The most critical stage in the heat treatment of high strength aluminium alloys is the rapid cooling necessary to form a supersaturated solid solution. A disadvantage of quenching is that the thermal gradients can be sufficient to cause inhomogeneous plastic deformation which in turn leads to the development of large residual stresses. Two 215 mm thick rectilinear forgings have been made from 7000 series alloys with widely different quench sensitivity to determine if solute loss in the form of precipitation during quenching can significantly affect residual stress magnitudes. The forgings were heat treated and immersion quenched using cold water to produce large magnitude residual stresses. The through thickness residual stresses were measured by neutron diffraction and incremental deep hole drilling. The distribution of residual stresses was found to be similar for both alloys varying from highly triaxial and tensile in the interior, to a state of biaxial compression in the surface. The 7010 forging exhibited larger tensile stresses in the interior. The microstructural variation from surface to centre for both forgings was determined using optical and transmission electron microscopy. These observations were used to confirm the origin of the hardness variation measured through the forging thickness. When the microstructural changes were accounted for in the through thickness lattice parameter, the residual stresses in the two forgings were found to be very similar. Solute loss in the 7075 forging appeared to have no significant effect on the residual stress magnitudes when compared to 7010. - Highlights: Black-Right-Pointing-Pointer Through thickness residual stress measurements made on large Al alloy forgings. Black-Right-Pointing-Pointer Residual stress characterised using neutron diffraction and deep hole drilling. Black-Right-Pointing-Pointer Biaxial compressive surface and triaxial subsurface residual stresses. Black-Right-Pointing-Pointer Quench sensitivity of 7075 promotes significant microstructural differences to 7010. Black-Right-Pointing-Pointer When precipitation is accounted for, residual stress in both forgings are similar.

  3. Mechanical properties of jammed packings of frictionless spheres under applied shear stress

    E-Print Network [OSTI]

    Hao Liu; Hua Tong; Ning Xu

    2015-02-03T23:59:59.000Z

    By minimizing a thermodynamic-like potential, we unbiasedly sample the potential energy landscape of soft and frictionless spheres under constant shear stress. We obtain zero-temperature jammed states under desired shear stresses and investigate their mechanical properties as a function of the shear stress. As a comparison, we also obtain jammed states from the quasistatic-shear sampling in which the shear stress is not well-controlled. Although the yield stresses determined by both samplings show the same power-law scaling with the compression from point $J$, i.e.~the jamming transition point at zero temperature and shear stress, for finite size systems, the quasistatic-shear sampling leads to a lower yield stress and a higher critical volume fraction of point $J$. The shear modulus of jammed solids decreases when increasing the shear stress. However, the shear modulus does not decay to zero at yielding. This discontinuous change of the shear modulus implies the discontinuous nature of the unjamming transition under nonzero shear stress, which is further verified by the observation of a discontinuous jump of the pressure from jammed solids to shear flows. The pressure jump decreases upon decompression and approaches zero at the critical-like point $J$, in analogy with well-known phase transitions under external field. The analysis of force networks in jammed solids reveals that the force distribution is more sensitive to the increase of the shear stress near point $J$. The force network anisotropy increases with the shear stress. Weak particle contacts near the average force and under large shear stresses exhibit asymmetric angle distribution.

  4. Induced alteration of the stomatal reponse to water stress in cotton

    E-Print Network [OSTI]

    Thomas, James Christian

    1974-01-01T23:59:59.000Z

    ~n Cotton plants were grown both in a controlled environment. chamber and in the field. Some plants were allowed to develop iree of water stress while others were subjected to varying amounts of water stress. The stomatal response to water. stress...?af water potential, . Several reports in the literature sufgcst that the stomatos of fi. eld-grown plants react differently than those of plants grown in a controlled environment chamber. Turner and Begg (30) found that the leaf water potential...

  5. Onset of flow in a confined colloidal glass under an imposed shear stress

    E-Print Network [OSTI]

    Pinaki Chaudhuri; Jürgen Horbach

    2014-10-26T23:59:59.000Z

    A confined colloidal glass, under the imposition of a uniform shear stress, is investigated using numerical simulations. Both at macro- and microscales, the consequent dynamics during the onset of flow is studied. When the imposed stress is gradually decreased, the time scale for the onset of steady flow diverges, associated with long-lived spatial heterogeneities. Near this yield-stress regime, persistent creep in the form of shear-banded structures is observed.

  6. HYDRAULIC FRACTURING AND OVERCORING STRESS MEASUREMENTS IN A DEEP BOREHOLE AT THE STRIPA TEST MINE, SWEDEN

    E-Print Network [OSTI]

    Doe, T.

    2010-01-01T23:59:59.000Z

    u l y 2 , 1 9 8 1 HYDRAULIC FRACTURING AND OVERCORING STRESSI nun LBL-12478 HYDRAULIC FRACTURING AND OVERCORING STRESSthe calculated stress. n HYDRAULIC FRACTURING EQUIPMENT AND

  7. adenosine stressed 99tcm-mibi: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    though no flow is present. The macroscopic stress evolution is connected to a length scale of residual liquefaction displayed by microscopic mean-squared displacements. The...

  8. abiotic acibenzolar-s-methyl stresses: Topics by E-print Network

    Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

    The macroscopic stress evolution is connected to a length scale of residual liquefaction displayed by microscopic mean-squared displacements. The theory describes this...

  9. Interactive effect of the serotonin transporter (5-HTTLPR) genotype and life stress predicting bipolar symptomatology

    E-Print Network [OSTI]

    Kotte, Amelia

    2011-01-01T23:59:59.000Z

    DIEGO STATE UNIVERSITY Interactive Effect of the SerotoninOF THE DISSERTATION Interactive Effect of the Serotoninthe independent and interactive effect of life stress and

  10. A New Coal-Permeability Model: Internal Swelling Stress and Fracture–Matrix Interaction

    E-Print Network [OSTI]

    Liu, Hui-Hai; Rutqvist, Jonny

    2010-01-01T23:59:59.000Z

    L. : Adsorption-induced coal swelling and stress:acid gas sequestration into coal seams. J Geophys. Res. (fracturing on permeability of coal. Min. Sci. Technol. 3,

  11. A new coal-permeability model: Internal swelling stress and fracture-matrix interaction

    E-Print Network [OSTI]

    Liu, H.H.

    2010-01-01T23:59:59.000Z

    of carbon dioxide in coal with enhanced coalbed methaneL. Adsorption-induced coal swelling and stress: Implicationsand acid gas sequestration into coal seams. J Geophys Res. (

  12. Hydrogen-peroxide-induced oxidative stress responses in Desulfovibrio vulgaris Hildenborough

    E-Print Network [OSTI]

    Zhou, A.

    2010-01-01T23:59:59.000Z

    Escherichia coli response to hydrogen peroxide. J Bacteriolagainst superoxide and hydrogen peroxide. Annu Rev BiochemHydrogen peroxide-induced oxidative stress responses in

  13. Errors induced in triaxial stress tensor calculations using incorrect lattice parameters

    SciTech Connect (OSTI)

    Ruud, C.O. [Pennsylvania State Univ., University Park, PA (United States). Materials Research Lab.; Kozaczek, K.J. [Oak Ridge National Lab., TN (United States)

    1994-06-01T23:59:59.000Z

    A number of researchers have proposed that for some metallic alloys, an elaborate procedure is necessary in order to improve the accuracy of the measured triaxial stress tensor. Others have been concerned that the uncertainties in establishing the precise zero-stress lattice parameter of an alloyed and/or cold worked engineering metal could cause significantly more error than would result in ignoring the triaxial stress state and assuming the plane stress condition. This paper illustrates the effect of uncertainties in the zero-stress lattice parameters on the calculated triaxial stress state for zero stress powders of three common engineering alloys, i.e., 1010 steel, 304 stainless steel, and 2024 aluminum. Also, errors due to the incorrect lattice spacing in experimental stress analysis are presented for three examples, i.e., a silicon powder, 304 gainless steel cylinder and a diamond. For cases where the plane strain assumption is justified, the uncertainties due to the stress free lattice parameter can be reduced by a simple measurement.

  14. Neutron scattering residual stress measurements on gray cast iron brake discs

    SciTech Connect (OSTI)

    Spooner, S.; Payzant, E.A.; Hubbard, C.R. [and others

    1996-11-01T23:59:59.000Z

    Neutron diffraction was used to investigate the effects of a heat treatment designed to remove internal residual stresses in brake discs. It is believed that residual stresses may change the rate of deformation of the discs during severe braking conditions when the disc temperature is increased significantly. Neutron diffraction was used to map out residual strain distributions in a production disc before and after a stress-relieving heat treatment. Results from these neutron diffraction experiments show that some residual strains were reduced by as much as 400 microstrain by stress relieving. 5 refs., 5 figs., 1 tab.

  15. Thermal Stress and Reliability for Advanced Power Electronics and Electric Machines (Presentation)

    SciTech Connect (OSTI)

    O'Keefe, M. P.

    2009-05-01T23:59:59.000Z

    This presentation gives an overview of NREL's Thermal Stress and Reliability Project work from October 2007 to March 2009 with an emphasis on activity during 2008/2009.

  16. Structural transformations in Mn{sub 2}NiGa due to residual stress

    SciTech Connect (OSTI)

    Singh, Sanjay; Maniraj, M.; D'Souza, S. W.; Barman, S. R. [UGC-DAE Consortium for Scientific Research, Khandwa Road, Indore 452001 (India); Ranjan, R. [Department of Materials Engineering, Indian Institute of Science, Bangalore 560012 (India)

    2010-02-22T23:59:59.000Z

    Powder x-ray diffraction study of Mn{sub 2}NiGa ferromagnetic shape memory alloy shows the existence of a 7M monoclinic modulated structure at room temperature (RT). The structure of Mn{sub 2}NiGa is found to be highly dependent on residual stress. For higher stress, the structure is tetragonal at RT, and for intermediate stress it is 7M monoclinic. However, only when the stress is considerably relaxed, the structure is cubic, as is expected at RT since the martensitic transition temperature is 230 K.

  17. Psychological mechanisms of gender differences in social support use under stress

    E-Print Network [OSTI]

    Larsen, Britta Ann

    2011-01-01T23:59:59.000Z

    Use Under Stress by Britta Ann Larsen Doctor of Philosophyin Psychology by Britta Ann Larsen Committee in charge:Winkielman Copyright Britta Ann Larsen, 2011 All rights

  18. Effects of weld residual stresses on crack-opening area analysis of pipes for LBB applications

    SciTech Connect (OSTI)

    Dong, P.; Rahman, S.; Wilkowski, G. [and others

    1997-04-01T23:59:59.000Z

    This paper summarizes four different studies undertaken to evaluate the effects of weld residual stresses on the crack-opening behavior of a circumferential through-wall crack in the center of a girth weld. The effect of weld residual stress on the crack-opening-area and leak-rate analyses of a pipe is not well understood. There are no simple analyses to account for these effects, and, therefore, they are frequently neglected. The four studies involved the following efforts: (1) Full-field thermoplastic finite element residual stress analyses of a crack in the center of a girth weld, (2) A comparison of the crack-opening displacements from a full-field thermoplastic residual stress analysis with a crack-face pressure elastic stress analysis to determine the residual stress effects on the crack-opening displacement, (3) The effects of hydrostatic testing on the residual stresses and the resulting crack-opening displacement, and (4) The effect of residual stresses on crack-opening displacement with different normal operating stresses.

  19. Finite element analysis of surface-stress effects in the Si lattice-parameter measurement

    E-Print Network [OSTI]

    Sasso, Carlo; Massa, Enrico; Mana, Giovanni; Kuetgens, Ulrich

    2013-01-01T23:59:59.000Z

    A stress exists in solids surfaces, similarly to liquids, also if the underlying bulk material is stress-free. This paper investigates the surface stress effect on the measured value of the Si lattice parameter used to determine the Avogadro constant by counting Si atoms. An elastic-film model has been used to provide a surface load in a finite element analysis of the lattice strain of the x-ray interferometer crystal used to measure the lattice parameter. Eventually, an experiment is proposed to work a lattice parameter measurement out so that there is a visible effect of the surface stress.

  20. Analysis of stress sensitivity and its influence on oil production from tight reservoirs

    E-Print Network [OSTI]

    Lei, Qun; Xiong, Wei; Yuan, Cui; Wu, Yu-Shu

    2008-01-01T23:59:59.000Z

    and Its Influence on Oil Production from Tight Reservoirscan affect well oil production. Specifically, pressure-Stress Sensitivity on Oil Production During oil production

  1. Maximum Entropy and the Stress Distribution in Soft Disk Packings Above Jamming

    E-Print Network [OSTI]

    Yegang Wu; S. Teitel

    2014-10-17T23:59:59.000Z

    We show that the maximum entropy hypothesis can successfully explain the distribution of stresses on compact clusters of particles within disordered mechanically stable packings of soft, isotropically stressed, frictionless disks above the jamming transition. We show that, in our two dimensional case, it becomes necessary to consider not only the stress but also the Maxwell-Cremona force-tile area, as a constraining variable that determines the stress distribution. The importance of the force-tile area was suggested by earlier computations on an idealized force-network ensemble.

  2. Photoelastic stress analysis on a Phoenix 7. 9-meter blade

    SciTech Connect (OSTI)

    Musial, W.D.; Jenks, M.D.; Osgood, R.M.; Johnson, J.A.

    1991-10-01T23:59:59.000Z

    Photoelastic tests were conducted on the Phoenix 7.9-meter blade to develop the basic methodology for locating critical strain areas on full-scale composite structures. Under relatively low elastic loading the strain fields over various regions on the blade planform were documented with 35mm photographs under different loading conditions at the Solar Energy Research Institute (SERI) Structural Test Facility (STF). Strain concentrations were easily located and quantified. Principal strain magnitudes and directions were determined at the highest strain areas using separator gages. Results were compared to measured operating loads. This experiment demonstrated the value of experimental stress analysis using the photoelastic technique for the evaluation of composite blade designs. 9 refs., 6 figs., 3 tabs.

  3. Creep and Fracture of a Protein Gel under Stress

    E-Print Network [OSTI]

    Mathieu Leocmach; Christophe Perge; Thibaut Divoux; Sébastien Manneville

    2014-08-19T23:59:59.000Z

    Biomaterials such as protein or polysaccharide gels are known to behave qualitatively as soft solids and to rupture under an external load. Combining optical and ultrasonic imaging to shear rheology we show that the failure scenario of a protein gel is reminiscent of brittle solids: after a primary creep regime characterized by a power-law behavior which exponent is fully accounted for by linear viscoelasticity, fractures nucleate and grow logarithmically perpendicularly to shear, up to the sudden rupture of the gel. A single equation accounting for those two successive processes nicely captures the full rheological response. The failure time follows a decreasing power law with the applied shear stress, similar to the Basquin law of fatigue for solids. These results are in excellent agreement with recent fiber-bundle models that include damage accumulation on elastic fibers and exemplify protein gels as model, brittle-like soft solids.

  4. Mechanical Properties of Gels; Stress from Confined Fluids

    SciTech Connect (OSTI)

    George W. Scherer

    2009-12-01T23:59:59.000Z

    Abstract for Grant DE-FG02-97ER45642 Period: 1997-2002 Mechanical Properties of Gels 2002-2008 Stress from Confined Fluids Principal investigator: Prof. George W. Scherer Dept. Civil & Env. Eng./PRISM Eng. Quad. E-319 Princeton, NJ 08544 USA Recipient organization: Trustees of Princeton University 4 New South Princeton, NJ 08544 USA Abstract: The initial stage of this project, entitled Mechanical Properties of Gels, was dedicated to characterizing and explaining the properties of inorganic gels. Such materials, made by sol-gel processing, are of interest for fabrication of films, fibers, optical devices, advanced insulation and other uses. However, their poor mechanical properties are an impediment in some applications, so understanding the origin of these properties could lead to enhanced performance. Novel experimental methods were developed and applied to measure the stiffness and permeability of gels and aerogels. Numerical simulations were developed to reproduce the growth process of the gels, resulting in structures whose mechanical properties matched the measurements. The models showed that the gels are formed by the growth of relatively robust clusters of molecules that are joined by tenuous links whose compliance compromises the stiffness of the structure. Therefore, synthetic methods that enhance the links could significantly increase the rigidity of such gels. The next stage of the project focused on Stress from Confined Fluids. The first problem of interest was the enhanced thermal expansion coefficient of water that we measured in the nanometric pores of cement paste. This could have a deleterious effect on the resistance of concrete to rapid heating in fires, because the excessive thermal expansion of water in the pores of the concrete could lead to spalling and collapse. A series of experiments demonstrated that the expansion of water increases as the pore size decreases. To explain this behavior, we undertook a collaboration with Prof. Stephen Garofalini (Rutgers), who has developed the best simulations of water ever reported by use of molecular dynamics. Simulated heating of water in small pores provided quantitative agreement with experiments, and showed that the origin of the high expansion is the altered structure of water in the first two molecular layers adjacent to the pore wall. The final focus of the project was to understand the damage done by crystals growing in small pores. For example, the primary cause of damage to ancient monuments in the Mediterranean Basin is growth of salt crystals in the pores of the stone. Salt may enter stone as a result of capillary rise of groundwater, by leaching of mortar joints, deposition of marine spray, or reactions with atmospheric pollutants (such as oxides of nitrogen or sulfur). As the water evaporates, the salt solution becomes supersaturated and crystals precipitate. Stress results, because the salt usually repels the minerals in the pore walls. Our goal was to identify the factors contributing to the repulsion, so that we could develop a chemical treatment to reduce the repulsion and hence the stress. (We have recently demonstrated an effective treatment as part of a separately funded study.) In collaboration with Prof. Garofalini, molecular dynamics simulations have been done that correctly reproduce the structure of water around dissolved ions of sodium and chloride. We simulated the interaction between crystals of sodium chloride and quartz, and found that this particular system exhibits attractive forces, in agreement with experiment. The origin of the attraction is the orientation of dipolar water molecules near the surfaces of the crystals. Similar calculations now must be done in systems, such as potassium chloride and quartz, where the interaction is repulsive. This grant supported the education of two doctoral students, Hang-Shing Ma (Ph.D., 2002) and Melanie Webb (Ph.D. expected 2010), three post-doctoral researchers, Joachim Gross, Gudrun Reichenauer, and Shuangyan (Sonia) Xu, and five undergraduates (for senior theses or independent projects

  5. DEVELOPMENT OF PLASTICITY MODEL USING NON ASSOCIATED FLOW RULE FOR HCP MATERIALS INCLUDING ZIRCONIUM FOR NUCLEAR APPLICATIONS

    SciTech Connect (OSTI)

    Michael V. Glazoff; Jeong-Whan Yoon

    2013-08-01T23:59:59.000Z

    In this report (prepared in collaboration with Prof. Jeong Whan Yoon, Deakin University, Melbourne, Australia) a research effort was made to develop a non associated flow rule for zirconium. Since Zr is a hexagonally close packed (hcp) material, it is impossible to describe its plastic response under arbitrary loading conditions with any associated flow rule (e.g. von Mises). As a result of strong tension compression asymmetry of the yield stress and anisotropy, zirconium displays plastic behavior that requires a more sophisticated approach. Consequently, a new general asymmetric yield function has been developed which accommodates mathematically the four directional anisotropies along 0 degrees, 45 degrees, 90 degrees, and biaxial, under tension and compression. Stress anisotropy has been completely decoupled from the r value by using non associated flow plasticity, where yield function and plastic potential have been treated separately to take care of stress and r value directionalities, respectively. This theoretical development has been verified using Zr alloys at room temperature as an example as these materials have very strong SD (Strength Differential) effect. The proposed yield function reasonably well models the evolution of yield surfaces for a zirconium clock rolled plate during in plane and through thickness compression. It has been found that this function can predict both tension and compression asymmetry mathematically without any numerical tolerance and shows the significant improvement compared to any reported functions. Finally, in the end of the report, a program of further research is outlined aimed at constructing tensorial relationships for the temperature and fluence dependent creep surfaces for Zr, Zircaloy 2, and Zircaloy 4.

  6. State of health and charge measurements in lithium-ion batteries using mechanical stress

    E-Print Network [OSTI]

    Arnold, Craig B.

    State of health and charge measurements in lithium-ion batteries using mechanical stress John 2014 Keywords: Mechanical stress Lithium-ion battery State of charge (SOC) State of health (SOH importance of state of health (SOH) and state of charge (SOC) measurement to lithium-ion battery systems

  7. Intercalation-Induced Stress and Heat Generation within Single Lithium-Ion Battery Cathode Particles

    E-Print Network [OSTI]

    Sastry, Ann Marie

    Intercalation-Induced Stress and Heat Generation within Single Lithium-Ion Battery Cathode, as will be discussed later. Heat transfer analyses of lithium-ion batteries have stemmed from work on full cells.10-induced stress and heat generation inside Li-ion battery cathode LiMn2O4 particles under potentiodynamic control

  8. Differential effects of stress on a murie model of multiple sclerosis.

    E-Print Network [OSTI]

    Heibel, Jessica

    2011-08-08T23:59:59.000Z

    in mice. However, these studies have primarily focused on the effects of chronic stress, while the effects of acute stress on a MS model have, for the most part, been ignored. The objectives of this experiment are to examine the differences in immune...

  9. , J. Geophys. Res., 103, 24469-24486 Stress Coupling Between Earthquakes in Northwest Turkey

    E-Print Network [OSTI]

    Hubert-Ferrari, Aurélia

    , J. Geophys. Res., 103, 24469-24486 Stress Coupling Between Earthquakes in Northwest Turkey, Istanbul, Turkey Aurélia Hubert and Geoffrey C. P. King Laboratoire de Tectonique et Mécanique de la stress interactions of 29 earthquakes (Ms 6.0) that have occurred in the region of northwest Turkey

  10. Analysis of Cardio-respiratory Dynamics during Mental Stress using (Partial) Time-Frequency Spectra

    E-Print Network [OSTI]

    important to determine the mechanisms un- derlying stress. In this paper, we aim at studying the cardio-respiratory to conduct a combined analysis of the cardio-respiratory system. In this study, we will perform cross timeAnalysis of Cardio-respiratory Dynamics during Mental Stress using (Partial) Time-Frequency Spectra

  11. Stress-dependent recovery of point defects in deformed aluminum: An acoustic-damping study

    SciTech Connect (OSTI)

    Ogi, H.; Tsujimoto, A.; Hirao, M.; Ledbetter, H.

    1999-10-26T23:59:59.000Z

    The stress dependence of point-defect diffusion to dislocations in a 99.99% polycrystalline aluminum was studied using shear-wave attenuation and phase velocity. By holding the stress after deformation, attenuation and velocity approach their nonstressed values. The holding stress was varied between 0 and 12 MPa, after applying a 15 MPa compressive stress. Time-independent attenuation and stress-induced velocity change were introduced into the Granato-Hikata-Luecke theory, which first established the change of attenuation and velocity caused by the point-defect diffusion to dislocations. Good agreement was found between measurements and the modified theory. The stress dependence of the recovery rate was interpreted as a reduction of the migration energy of point defects diffusing to dislocations, and the activation volume was calculated for uniaxial stress. Electromagnetic acoustic resonance (EMAR) was used for the measurements. Being noncontact and highly sensitive, EMAR permitted detailed measurement of the attenuation and velocity evolutions during the unloading-holding stress sequence.

  12. Transient Thermal and Stress Response of A Helium-Cooled Tungsten Plate-Type Divertor

    E-Print Network [OSTI]

    Raffray, A. René

    Transient Thermal and Stress Response of A Helium- Cooled Tungsten Plate-Type Divertor X.R. Wang, A and shutdown operations have been analyzed with a coupled transient thermo-fluid and thermal-stress approach and investigated for power plant applications with a goal of accommodating a heat flux of 10 MW/m2 . The concepts

  13. Constraints on 3-D stress in the crust from support of mid-ocean ridge topography

    E-Print Network [OSTI]

    Sandwell, David T.

    with the cooling and subsidence of the oceanic lithosphere. The short-wavelength surface and Moho topographyConstraints on 3-D stress in the crust from support of mid-ocean ridge topography Karen Luttrell1 of these stresses may be constrained using seafloor topography and gravity. The topography is divided into a short

  14. Personality variables and reaction to stress in long vs. short sleepers

    E-Print Network [OSTI]

    Leonard, Angela Harman

    1977-01-01T23:59:59.000Z

    ) Sleep Group (8) Control 5. 4735 (1) Short 6. 4167 Means LZZ Stress 6. 7302 (2) Medium 5. 9603 (3) Long 5. 9286 (A) (1) Control (2) Stress (8) ~iShort 5. 5000 7. 3333 (2) Medio ~hto 5. 7778 5. 1429 6. 1429 6. 7143 28 Table 16 T...

  15. Hot tearing test for TIG welding of aluminum alloys: application of a stress parallel to the

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Page 1 Hot tearing test for TIG welding of aluminum alloys: application of a stress parallel in aluminum alloys welding is an important industrial issue. Understanding of hot cracking phenomenon welding. The originality of the test presented here is that an external stress is applied on the test

  16. XIAP is essential for shear stress-enhanced Tyr-576 phosphorylation of FAK

    SciTech Connect (OSTI)

    Ahn, Sunyoung [Department of Molecular Biology and Institute of Nanosensor and Biotechnology, BK21 Graduate Program for RNA Biology, Dankook Univiersity, 126, Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do, 448-701 (Korea, Republic of)] [Department of Molecular Biology and Institute of Nanosensor and Biotechnology, BK21 Graduate Program for RNA Biology, Dankook Univiersity, 126, Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do, 448-701 (Korea, Republic of); Park, Heonyong, E-mail: heonyong@dankook.ac.kr [Department of Molecular Biology and Institute of Nanosensor and Biotechnology, BK21 Graduate Program for RNA Biology, Dankook Univiersity, 126, Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do, 448-701 (Korea, Republic of)] [Department of Molecular Biology and Institute of Nanosensor and Biotechnology, BK21 Graduate Program for RNA Biology, Dankook Univiersity, 126, Jukjeon-dong, Suji-gu, Yongin-si, Gyeonggi-do, 448-701 (Korea, Republic of)

    2010-08-20T23:59:59.000Z

    Research highlights: {yields} Laminar shear stress phosphorylates Tyr-576 in FAK. {yields} XIAP is essential for shear stress-induced phosphorylation of Tyr-576. {yields} XIAP knockdown induces shear stress-triggered translocation of FAK into nucleus. {yields} XIAP regulates ERK activation by maintaining the Src-accessible location of FAK. -- Abstract: In endothelial cells, X-chromosome linked inhibitor of apoptosis protein (XIAP) regulates cell survival, migration and adhesion. We have recently found that XIAP recruits focal adhesion kinase (FAK) into integrin-associated focal adhesions, controlling cell migration. However, little is understood about the molecular mechanisms by which FAK modulation is controlled by XIAP. In this study, we show that XIAP modulates FAK activity through the control of FAK phosphorylation. In bovine aortic endothelial cells (BAEC), phosphorylation of Tyr-576 in FAK is elevated by laminar shear stress. This elevated phosphorylation appears to be responsible for shear stress-stimulated ERK activation. We found that XIAP knockdown reduces shear stress-enhanced phosphorylation of Tyr-576 and induces shear stress-triggered translocation of FAK into nucleus. Nuclear translocation of FAK reduces contact between FAK and Src, a kinase which phosphorylates Tyr-576. This spatial segregation of FAK from Src decreases Tyr-576 phosphorylation and thus shear-stimulated ERK activation. Taken together, our results demonstrate that XIAP plays a key role in shear stress-stimulated ERK activation by maintaining the Src-accessible location of FAK.

  17. Stress state of diamond and gold under nonhydrostatic compression Jianghua Wang,1

    E-Print Network [OSTI]

    Duffy, Thomas S.

    for the polycrystalline gold under the highest load. Polycrystalline diamond can support a microscopic deviatoric stress of polycrystalline diamond and gold in the DAC under nonhydrostatic compression to above 300 GPa. The influenceStress state of diamond and gold under nonhydrostatic compression to 360 GPa Jianghua Wang,1

  18. Moleculardynamics simulation of thermal stress at the (100) diamond/substrate interface: effect of film continuity

    E-Print Network [OSTI]

    Adler, Joan

    with the development of advanced CVD techniques 2 producing polycrystalline diamond of quality approachingMolecular­dynamics simulation of thermal stress at the (100) diamond/substrate interface: effect at the (100) diamond/substrate interface. The stress­induced binding energy reduction obtained

  19. Ultrasonic measurement of the residual stresses in patch welded steel plates

    E-Print Network [OSTI]

    Junghans, Paul Gerard

    1994-01-01T23:59:59.000Z

    , structural steel plates. The two 1.2 in (48 in.) square plates were patch welded in the center to create a residual stress field; and subsequently, one of the plates was stress relieved. The LCR travel-time measurements on the plates not only differentiated...

  20. Final Report: Geothermal Dual Acoustic Tool for Measurement of Rock Stress

    SciTech Connect (OSTI)

    Normann, Randy A.

    2014-12-01T23:59:59.000Z

    This paper outlines the technology need for a rock formation stress measurement in future EGS wells. This paper reports on the results of work undertaken under a Phase I, DOE/SBIR on the feasibility to build an acoustic well logging tool for measuring rock formation stress.