Sample records for hulls nut shells

  1. Controlling the Pecan Nut Casebearer

    E-Print Network [OSTI]

    Knutson, Allen E.; Ree, Bill

    2005-03-31T23:59:59.000Z

    Controlling the Pecan Nut Case bear er Allen Knutson and Bill Ree* pollination. Eggs hatch in 4 to 5 days. Young larvae crawl to nearby buds to begin feeding, leaving empty white egg shells on the nut. The tiny...-generation eggs are deposited on nuts from late July to early Sep tem ber. These larvae feed only in the shucks if the pecan shells have hardened. Many third- and, if present, fourth-gen er a tion larvae do not feed, but crawl to the base of a dor mant bud...

  2. Feeding value of ammoniated rice hulls, cottonseed hulls and Coastal Bermudagrass hay in high-concentrate rations for lactating dairy cows

    E-Print Network [OSTI]

    Sekhara Rao, Basavarju Purna Chandra

    1969-01-01T23:59:59.000Z

    'tl. nut au%arse effects on rate of growth. ! o" and and Ford (30) called attention to the importance of suppl sentatlon with protegn, m marais and Vitamin A wnen race hulls . ue used to replace 15 to 25 percent of the prairie hay in the diet...

  3. Use of cottonseed hulls, rice hulls, and ammoniated rice hulls for finishing calves commercially

    E-Print Network [OSTI]

    Vestal, Norman Finley

    1967-01-01T23:59:59.000Z

    USE OF COTTONSEED HULLS, RICE HULLS, AND AMMONIATED RICE HULLS FOR FINISHING CALVES COMMERCIALLY A Theste NORMAN FINLEY VESTAL Subxnttted to the Graduate CoIlege of the Teaac W hhf Uxdvers@y;M -: partfal AdBHaioct:if the reqsh;~ Air. the.... degree-. -cf MASTER OF SCIENCE August 1967 MaJor Subject: ' Anginal Science . USE OF COTTONSEED HULLS, RICE HULLS, AND AMMONIATED RICE HULLS FOR FINISHING CALVES COMMERCIALLY A Tbesls NORMAN FINLEY VESTAL Approved as to style and content by. ) I...

  4. The nuts and bolts of The nuts and bolts of

    E-Print Network [OSTI]

    Manolescu, Ioana

    of The nuts and bolts of The nuts and bolts of The nuts and bolts of The nuts and bolts of DBMS construction: DBMS construction: DBMS construction: DBMS construction: DBMS construction: DBMS construction: DBMS construction: DBMS construction: building your own prototype building your own prototype building your own

  5. Hull | 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 on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Office of Inspector GeneralDepartmentAUDIT REPORTOpen EnergyBoard"Starting a new pageHuade CountyShouguangHugoHull

  6. JAY G. HULL Home Address

    E-Print Network [OSTI]

    Bucci, David J.

    ;Publications: Hull, J.G., Brunelle, T.J., Prescott, A.T., & Sargent, J.D. (2014). A longitudinal study of risk.02.001] Hull, J.G., Draghici, A.M., & Sargent, J.D. (2012). A longitudinal study of risk- glorifying video attributions: An empirical study. Review of Philosophy and Psychology (formerly European Review of Philosophy

  7. Analysis of the physical and mechanical properties of the pine nut as criteria in the design of a pine nut shelter

    E-Print Network [OSTI]

    Menchaca Lara, Jesus

    1996-01-01T23:59:59.000Z

    ) deformations ranging from 0.82 mm to 1. 14 mm is required to fracture seeds of different sizes, 3) void spaces differ according to seed size allowing deformation of shell without contacting the nut, grouping seeds in size classifications is needed to minimize...

  8. Cylinder valve packing nut studies

    SciTech Connect (OSTI)

    Blue, S.C. [Martin Marietta Energy Systems, Inc., Paducah, KY (United States)

    1991-12-31T23:59:59.000Z

    The design, manufacture, and use of cylinder valve packing nuts have been studied to improve their resistance to failure from stress corrosion cracking. Stress frozen photoelastic models have been analyzed to measure the stress concentrations at observed points of failure. The load effects induced by assembly torque and thermal expansion of stem packing were observed by strain gaging nuts. The effects of finishing operations and heat treatment were studied by the strain gage hole boring and X-ray methods. Modifications of manufacturing and operation practices are reducing the frequency of stress corrosion failures.

  9. Hull Wind: A Community Gets Green

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

    Hull Wind A Community Gets Green Community Wind Power National Renewable Energy Laboratory September 18, 2012 Andrew Stern Executive Director Action for Clean Energy, Inc. www....

  10. RECIPIENT:Hull Municipal Light Plant STATE: MA PROJECT TITLE...

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

    :: Page 1 01 :L RECIPIENT:Hull Municipal Light Plant STATE: MA PROJECT TITLE: Hull Offshore Wind Research and Development Funding Opportunity Announcement Number Procurement...

  11. The effect of flaxseed hulls on expanded corn meal products

    E-Print Network [OSTI]

    Barron, Marc Edward

    2009-05-15T23:59:59.000Z

    Page 14 Environmental Scanning Electron Microscope images of extruadates containing brown flaxseed hulls. A) 25% Brown flaxseed hulls (15% feed moisture); B). 25% Brown flaxseed hulls (12% feed moisture)...56 15 Environmental Scanning Electron...) with 20% brown flaxseed hulls, D) whole ground white (ATX631xRTX436)?????? 80 26 Environmental Scanning Electron Microscope images of Sumac extruadates with and with out brown flaxseed hulls. A) Extrudate with 80% Sumac and 20% Brown...

  12. Hull Wind: A Community Gets Green | Department of Energy

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

    Hull Wind: A Community Gets Green Hull Wind: A Community Gets Green U.S. Department of Energy Community and Renewable Energy Success Stories webinar series titled Wind Energy in...

  13. tight_nuts_thehub closed_boot

    E-Print Network [OSTI]

    Murphy, Robert F.

    tight_nuts_the­hub closed_boot in_jack_boot in_pump_boot in_wheel1_boot in_wrench_boot inflated_nuts_the­hub closed_boot in_jack_boot in_pump_boot in_wheel1_boot in_wrench_boot inflated_wheel2 on_wheel2_the­hub tight_nuts_the­hub closed_boot in_jack_boot in_pump_boot in_wheel1_boot in_wrench_boot inflated_wheel2

  14. The Hull-White Model: Calibration with Irregular Trinomial Trees

    E-Print Network [OSTI]

    Lyuu, Yuh-Dauh

    The Hull-White Model: Calibration with Irregular Trinomial Trees · The previous calibration of the tree's irregular shape. c 2011 Prof. Yuh-Dauh Lyuu, National Taiwan University Page 1019 #12;The Hull-White the spot rates exactly. c 2011 Prof. Yuh-Dauh Lyuu, National Taiwan University Page 1020 #12;The Hull-White

  15. Displacement Hull Catamaran July 26, 2006

    E-Print Network [OSTI]

    Wood, Stephen L.

    hull catamaran, comparing the vessels accelerations in calm water to those in rough water. While the accelerations in rough water were greater than those in calm water, they were not as significant as a planing catamaran in heavy sea conditions. #12;4 Table of Contents Letter of Transmittal

  16. Optimization Online - Convex Hull Pricing in Electricity Markets ...

    E-Print Network [OSTI]

    Dane Schiro

    2015-03-19T23:59:59.000Z

    Mar 19, 2015 ... Convex Hull Pricing in Electricity Markets: Formulation, Analysis, and Implementation Challenges. Dane Schiro (dschiro ***at*** iso-ne.com)

  17. Range-based navigation of AUVs operating near ship hulls

    E-Print Network [OSTI]

    Kokko, Michael A. (Michael Andrew)

    2007-01-01T23:59:59.000Z

    In-water ship hull inspection is essential for both routine preventative maintenance as well as for timely detection and neutralization of limpet mines planted on military and commercial vessels. While a host of inspection ...

  18. Research and adoption of biotechnology strategies could improve California fruit and nut crops

    E-Print Network [OSTI]

    Haroldsen, Victor M; Paulino, Gabriel; Chi-ham, Cecilia; Bennett, Alan B

    2012-01-01T23:59:59.000Z

    of Production for Selected Fruit and Tree Nuts, by State,production of top 10 woody fruit and nut crops, 2010. Cropsfor top 10 California woody fruit and nut crops, 2010 Grape*

  19. On the NUT-Born-Infeld-$?$ spacetime

    E-Print Network [OSTI]

    Nora Bretn; C. E. Ramrez-Codiz

    2014-08-19T23:59:59.000Z

    The stationary axisymmetric spacetime coupled to nonlinear Born-Infeld electrodynamics is studied. The solution was derived by Plebanski et al (1984) and it is characterized by six free parameters: mass, NUT charge, electric and magnetic charge, Born-Infeld parameter and cosmological constant. The geodesic and Lorentz force equations are integrated, and a qualitative analysis of the effect of varying the parameters in the effective potential is provided. Then the light and charged particle trajectories are discussed. The conditions that determine an extreme black hole are presented as well.

  20. Taub-NUT Black Holes in Third order Lovelock Gravity

    E-Print Network [OSTI]

    S. H. Hendi; M. H. Dehghani

    2008-08-05T23:59:59.000Z

    We consider the existence of Taub-NUT solutions in third order Lovelock gravity with cosmological constant, and obtain the general form of these solutions in eight dimensions. We find that, as in the case of Gauss-Bonnet gravity and in contrast with the Taub-NUT solutions of Einstein gravity, the metric function depends on the specific form of the base factors on which one constructs the circle fibration. Thus, one may say that the independence of the NUT solutions on the geometry of the base space is not a robust feature of all generally covariant theories of gravity and is peculiar to Einstein gravity. We find that when Einstein gravity admits non-extremal NUT solutions with no curvature singularity at $r=N$, then there exists a non-extremal NUT solution in third order Lovelock gravity. In 8-dimensional spacetime, this happens when the metric of the base space is chosen to be $\\Bbb{CP}^{3}$. Indeed, third order Lovelock gravity does not admit non-extreme NUT solutions with any other base space. This is another property which is peculiar to Einstein gravity. We also find that the third order Lovelock gravity admits extremal NUT solution when the base space is $T^{2}\\times T^{2}\\times T^{2}$ or $S^{2}\\times T^{2}\\times T^{2}$. We have extended these observations to two conjectures about the existence of NUT solutions in Lovelock gravity in any even-dimensional spacetime.

  1. Metallic nut for use with ceramic threads

    DOE Patents [OSTI]

    Norton, Paul F. (San Diego, CA); Shaffer, James E. (Maitland, FL)

    1996-01-01T23:59:59.000Z

    A nozzle guide vane assembly has ceramic components therein having a conventional thread thereon including a preestablished pitch and having a preestablished rate of thermal expansion. The nozzle guide vane assembly has a metallic components therein having a preestablished rate of thermal expansion being greater that the rate of thermal expansion of the ceramic components is positioned in a gas turbine engine. The metallic component, a nut, has a thread therein including a plurality of crests being spaced on a pitch equal to that of the ceramic component and has a pair of contacting surfaces extending from the plurality of crests. A notch spirally extends intermediate adjacent ones of the plurality of crests and has a preestablished depth which is at least twice the size of the conventional pitch. Furthermore, the pair of contacting surfaces are in contact with only a portion of the threaded surface of the ceramic components.

  2. MEASUREMENT OF TRITIUM DURING VOLOXIDATION OF ZIRCALOY-2 FUEL HULLS

    SciTech Connect (OSTI)

    Crowder, M.; Laurinat, J.; Stillman, J.

    2010-10-14T23:59:59.000Z

    A straightforward method to evaluate the tritium content of Zircaloy-2 cladding hulls via oxidation of the hull and capture of the volatilized tritium in liquids has been demonstrated. Hull samples were heated in air inside a thermogravimetric analyzer (TGA). The TGA was rapidly heated to 1000 C to oxidize the hulls and release absorbed tritium. To capture tritium, the TGA off-gas was bubbled through a series of liquid traps. The concentrations of tritium in bubbler solutions indicated that tritiated water vapor was captured nearly quantitatively. The average tritium content measured in the hulls was 19% of the amount of tritium produced by the fuel, according to ORIGEN2 isotope generation and depletion calculations. Published experimental data show that Zircaloy-2 oxidation follows an Arrhenius model, and that an initial, nonlinear oxidation rate is followed by a faster, linear rate after 'breakaway' of the oxide film. This study demonstrates that the linear oxidation rate of Zircaloy samples at 974 C is faster than predicted by the extrapolation of data from lower temperatures.

  3. Design of a high speed planing hull with a cambered step and surface piercing hydrofoils

    E-Print Network [OSTI]

    Faison, Leon Alexander

    2014-01-01T23:59:59.000Z

    Design of a high speed planing hull is analyzed by implementing a cambered step and stem, surface piercing hydrofoils, commonly known as a Dynaplane hull. This configuration combines the drag reduction benefits of a stepped ...

  4. Mller's energy of the Kerr-NUT Metric

    E-Print Network [OSTI]

    Gamal G. L. Nashed

    2008-04-03T23:59:59.000Z

    The energy distribution of the Kerr-NUT space-time is calculated using M\\o ller's energy-momentum complex within the framework of the Riemannian geometry.

  5. NUT-Charged Black Holes in Gauss-Bonnet Gravity

    E-Print Network [OSTI]

    M. H. Dehghani; R. B. Mann

    2005-11-30T23:59:59.000Z

    We investigate the existence of Taub-NUT/bolt solutions in Gauss-Bonnet gravity and obtain the general form of these solutions in $d$ dimensions. We find that for all non-extremal NUT solutions of Einstein gravity having no curvature singularity at $r=N$, there exist NUT solutions in Gauss-Bonnet gravity that contain these solutions in the limit that the Gauss-Bonnet parameter $\\alpha$ goes to zero. Furthermore there are no NUT solutions in Gauss-Bonnet gravity that yield non-extremal NUT solutions to Einstein gravity having a curvature singularity at $r=N$ in the limit $% \\alpha \\to 0$. Indeed, we have non-extreme NUT solutions in $2+2k$ dimensions with non-trivial fibration only when the $2k$-dimensional base space is chosen to be $\\mathbb{CP}^{2k}$. We also find that the Gauss-Bonnet gravity has extremal NUT solutions whenever the base space is a product of 2-torii with at most a 2-dimensional factor space of positive curvature. Indeed, when the base space has at most one positively curved two dimensional space as one of its factor spaces, then Gauss-Bonnet gravity admits extreme NUT solutions, even though there a curvature singularity exists at $r=N$. We also find that one can have bolt solutions in Gauss-Bonnet gravity with any base space with factor spaces of zero or positive constant curvature. The only case for which one does not have bolt solutions is in the absence of a cosmological term with zero curvature base space.

  6. Alumni Scholarship Recipients 1936 -2006 Barbara Ann Hull Harris

    E-Print Network [OSTI]

    Williams, Gary A.

    '51 Dolores R. Dunne Smith* '51 Gerladine E. Curley Somers '51 Roland Suarez '51 Betty J. JarrellAlumni Scholarship Recipients 1936 - 2006 1 1939 Barbara Ann Hull Harris 1940 Gail Martin* '40 Robert Stabler '40 1942 Edna J. Traghber Kulli Geraldine F. Moise Millikan 1943 John McGill* '43, M

  7. Improved Grades and Consumer Demand for In-Shell Pecans.

    E-Print Network [OSTI]

    Brison, Fred R.; Branson, Robert E.; Clark, Wayne W.; Krezdorn, A. H.; Storey, J. B.

    1959-01-01T23:59:59.000Z

    of the proposed grade index, Suc- cess cmd Mahan retail store samples that were be- low grade according to USDA grade standards, were actually superior to the U. S. No. 1 grade store sam- 1 ples of Stuart and mixed varieties. About half of the pecans sold... and at- tractiveness of the product. In many cases the quality of the pecans stocked appeared to be poor. The Stuart was the most common variety handled. It has acceptable but not superior eat- ing and shelling qualities. Shelled nuts of various...

  8. Disruption Tolerant Shell

    E-Print Network [OSTI]

    Lukac, Martin; Girod, Lewis; Estrin, D

    2006-01-01T23:59:59.000Z

    Disruption Tolerant Shell ? Martin Lukac UCLA CENS 3563a reliable asynchronous remote shell interface (referred toas Disruption Tolerant Shell, DTS) to accomplish the

  9. Hull Wind II: A Case Study of the Development of a Second Large Wind Turbine Installation in the Town of Hull, MA

    E-Print Network [OSTI]

    Massachusetts at Amherst, University of

    ; a capped landfill was chosen. Resource assessment took advantage of the Hull Wind I experience, nearby data made the wind power projects economically feasible; and a citizenry willing to participate actively for salt production. Hull's pursuit of modern wind power began more than 20 years ago, with the 1985

  10. Turn-of-the-nut tightening of anchor bolts

    E-Print Network [OSTI]

    Richards, Jason Halbert

    2004-09-30T23:59:59.000Z

    progressive tightening tests were performed in order to monitor the stress ranges occurring in the bolt at various locations of interest at various degrees of turn-of-the-nut tightness. Tests were performed on six diameters of anchor bolt ranging from 1 to 2...

  11. Campusontwikkeling Over nut en noodzaak, en over lessen uit Amerika

    E-Print Network [OSTI]

    Atzema, Oedzge

    Campusontwikkeling in Utrecht Over nut en noodzaak, en over lessen uit Amerika Oedzge Atzema #12; Colofon Deze uitgave werd mogelijk door bijdragen van: Gemeente Utrecht Hogeschool Utrecht SSH Utrecht UMC Utrecht Universiteit Utrecht Tekst: Oedzge Atzema Foto's: Ruut van Rossen e.a. Eindredactie: Marianne

  12. Week 1 Lecture Global TIES Intro: Nuts `n Bolts

    E-Print Network [OSTI]

    Fainman, Yeshaiahu

    Global TIES budget $300 Funding Source 1 Funding Source 2 Total Funding for Project $300 DonatedWeek 1 Lecture Global TIES Intro: Nuts `n Bolts September 30, 2011 #12;Course Structure · Friday responsibility · Overall commitment ~8hrs/week #12;Lecture Schedule Week Date Topic 1 9/30 Global TIES Intro

  13. Inventory and Status Report of American Ground Nut

    E-Print Network [OSTI]

    Inventory and Status Report of American Ground Nut (Apios americana Medicus) in Colorado Prepared in the field. Donna Schorrock's assistance with inventory and pollinator observation was a valuable asset. Dr. Craig Freeman of the Kansas Natural Heritage Inventory and University of Kansas Herbarium

  14. Hull Wind II Wind Farm | 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 on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 No revision hasInformation Earth's Heat Jump to:PhotonHolyName HousingIII Wind FarmWould YouHowardHuecoHull Wind

  15. Hydrodynamics of high speed planing hulls with partially ventilated bottom and hydrofoils

    E-Print Network [OSTI]

    Sheingart, Zvi

    2014-01-01T23:59:59.000Z

    The influence of a cambered shaped bottom step on the performance of sea going V-stepped planing hulls is investigated using numerical methods. The shape of the step was designed to decrease the Drag/Lift ratio of the hull ...

  16. ORIGINAL ARTICLE Development of a mobile welding robot for double-hull structures

    E-Print Network [OSTI]

    Kim, Jongwon

    ORIGINAL ARTICLE Development of a mobile welding robot for double-hull structures in shipbuilding describes the development of a self- driving mobile welding robot. The robot is used to weld U-shaped welding areas in enclosed double-hull structures. In order to place itself inside the double

  17. WIND TURBINE SITING IN AN URBAN ENVIRONMENT: THE HULL, MA 660 KW TURBINE

    E-Print Network [OSTI]

    Massachusetts at Amherst, University of

    1 WIND TURBINE SITING IN AN URBAN ENVIRONMENT: THE HULL, MA 660 KW TURBINE J. F. Manwell, J. G. Mc turbine at Windmill Point in Hull, Massachusetts represents a high point in the long history of wind, through the installation of a 40 kW Enertech machine in the 1980's to the installation of the new turbine

  18. Taub-NUT and Dynamical Systems : the geometric connection demystified

    E-Print Network [OSTI]

    Chanda, Sumanto; Roychowdhury, Raju

    2015-01-01T23:59:59.000Z

    A short analysis of the curvature of the Taub-NUT tells us if it truly is a gravitational instanton, followed up by a brief review of its other geometrical properties. We follow this up with a comparison to Bertrand spacetime and computation of its conserved quantities. Such quantities reflect on its symmetries expressed through Killing tensors, like the Killing St\\"ackel and Yano tensors. We will attempt to describe an easy procedure to derive the spatial Killing-Yano tensors from the conserved quantities and examine the possibility of a graded Lie-algebra structure via Schouten-Nijenhuis brackets. Finally we will derive the related hyperk\\"ahler structures and compare them with the Killing-Yano tensors of Taub-NUT.

  19. Clean heat, steam, and electricity from rice hull gasification

    SciTech Connect (OSTI)

    Bailey, R.W.; Bailey, R. Jr. [PRM Energy Systems, Inc., Hot Springs, AR (United States)

    1996-12-31T23:59:59.000Z

    PRM Energy Systems, Inc., (PRME) has completed the installation of a 330 ton/day biomass gasification system for Cargill Rice Milling of Greenville, Mississippi. The system was activated on November 1, 1995. Using the information and experience gained from the operation of previous installations, PRME scaled up its already proven technology by a factor of four and designed the model KC-218 to meet the needs of this particular facility. The PRME model KC-218 system converts unground rice hulls/straw and other biomass fuels to combustible gas which is burned in the boiler furnace delivering 115 million Btus/hr to an existing boiler/power island 5.0 MW of electricity and 15,000 pounds per hour of process steam for this rice parboiling facility.

  20. Fruit and Nut Disease Control Products for Use in Texas

    E-Print Network [OSTI]

    Philley, George L.

    2004-02-23T23:59:59.000Z

    and/or distributors Contents 3 Fruit and Nut Disease Control PRODUCTS FOR USE IN TEXAS By George L.Philley* his listing of chemicals to control fruit diseases is a reference for county Extension agents and fruit producers in Texas... interval in days DF ?dry flowable F ?flowable L?liquid WDG ?wettable dispersable granule WG ?wettable granule WP?wettable powder days. Example: 7* indicates a 7-day interval from last application to har- vest. At the end of the publication is a listing...

  1. A tool to create hydrodynamically optimized hull-forms with geometrical constraints from internal arrangements

    E-Print Network [OSTI]

    Nestoras, Konstantinos, Nav.E. Massachusetts Institute of Technology

    2013-01-01T23:59:59.000Z

    Internal arrangements and bulky equipment like machinery have been treated for many years as a secondary aspect of the ship design. Traditionally, in the design process, the centerpiece of the effort is the hull and its ...

  2. Advanced perception, navigation and planning for autonomous in-water ship hull inspection

    E-Print Network [OSTI]

    Hover, Franz S.

    2013-04-24T23:59:59.000Z

    Inspection of ship hulls and marine structures using autonomous underwater vehicles has emerged as a unique and challenging application of robotics. The problem poses rich questions in physical design and operation, ...

  3. Disruption Tolerant Shell (SYS 13)

    E-Print Network [OSTI]

    Martin Lukac; Lewis Girod; Deborah Estrin

    2006-01-01T23:59:59.000Z

    Sensing Disruption Tolerant Shell Martin Lukac, Lewis Girod,Solution: Disruption Tolerant Shell Data Delivery: DTN Usemanagement tool: remote shell (ssh) Published data is hop-

  4. MANAGING INSECT PESTS OF NUT TREES Clifford S. Sadof and Ricky E. Foster, Extension Entomologists

    E-Print Network [OSTI]

    Ginzel, Matthew

    - tion. Several pests of these crops, such as mites, aphids, and scales can be controlled by conserving in walnut husks. Feeding by first generation caterpillars on small nuts causes premature drop. Second generation feeding discolors nuts at stem end. Cultural Practices Sanitation Monitoring Insecticides Bacillus

  5. Comments on photonic shells

    E-Print Network [OSTI]

    M. Zofka

    2004-03-05T23:59:59.000Z

    We investigate in detail the special case of an infinitely thin static cylindrical shell composed of counter-rotating photons on circular geodetical paths separating two distinct parts of Minkowski spacetimes--one inside and the other outside the shell--and compare it to a static disk shell formed by null particles counter-rotating on circular geodesics within the shell located between two sections of flat spacetime. One might ask whether the two cases are not, in fact, merely one.

  6. Off-Shell Tachyons

    E-Print Network [OSTI]

    Yi-Lei Tang

    2015-01-30T23:59:59.000Z

    The idea that the new particles invented in some models beyond the standard model can appear only inside the loops is attractive. In this paper, we fill these loops with off-shell tachyons, leading to a solution of the zero results of the loop diagrams involving the off-shell non-tachyonic particles. We also calculate the Passarino-Veltman $A_0^o$ and $B_0^o$ of the off-shell tachyons.

  7. Putting the press to the test : effects of temperature on Shea nut oil output

    E-Print Network [OSTI]

    Tacoronte, Lisa Cristina

    2010-01-01T23:59:59.000Z

    In northern Ghana, part of a belt reaching from Sub-Saharan Africa to northern Uganda, women collect and process Shea nuts for their valuable oil. This oil is then used in various cosmetic, cooking, and medicinal products. ...

  8. Thin shell model revisited

    E-Print Network [OSTI]

    Sijie Gao; Xiaobao Wang

    2014-12-26T23:59:59.000Z

    We reconsider some fundamental problems of the thin shell model. First, we point out that the "cut and paste" construction does not guarantee a well-defined manifold because there is no overlap of coordinates across the shell. When one requires that the spacetime metric across the thin shell is continuous, it also provides a way to specify the tangent space and the manifold. Other authors have shown that this specification leads to the conservation laws when shells collide. On the other hand, the well-known areal radius $r$ seems to be a perfect coordinate covering all regions of a spherically symmetric spacetime. However, we show by simple but rigorous arguments that $r$ fails to be a coordinate covering a neighborhood of the thin shell if the metric across the shell is continuous. When two spherical shells collide and merge into one, we show that it is possible that $r$ remains to be a good coordinate and the conservation laws hold. To make this happen, different spacetime regions divided by the shells must be glued in a specific way such that some constraints are satisfied. We compare our new construction with the old one by solving constraints numerically.

  9. Transfer Factors for Contaminant Uptake by Fruit and Nut Trees

    SciTech Connect (OSTI)

    Napier, Bruce A.; Fellows, Robert J.; Minc, Leah D.

    2013-11-20T23:59:59.000Z

    Transfer of radionuclides from soils into plants is one of the key mechanisms for long-term contamination of the human food chain. Nearly all computer models that address soil-to-plant uptake of radionuclides use empirically-derived transfer factors to address this process. Essentially all available soil-to-plant transfer factors are based on measurements in annual crops. Because very few measurements are available for tree fruits, samples were taken of alfalfa and oats and the stems, leaves, and fruits and nuts of almond, apple, apricot, carob, fig, grape, nectarine, pecan, pistachio (natural and grafted), and pomegranate, along with local surface soil. The samples were dried, ground, weighed, and analyzed for trace constituents through a combination of induction-coupled plasma mass spectrometry and instrumental neutron activation analysis for a wide range of naturally-occurring elements. Analysis results are presented and converted to soil-to-plant transfer factors. These are compared to commonly used and internationally recommended values. Those determined for annual crops are very similar to commonly-used values; those determined for tree fruits show interesting differences. Most macro- and micronutrients are slightly reduced in fruits; non-essential elements are reduced further. These findings may be used in existing computer models and may allow development of tree-fruit-specific transfer models.

  10. Hull/Mooring/Riser coupled motion simulations of thruster-assisted moored platforms

    E-Print Network [OSTI]

    Ryu, Sangsoo

    2005-02-17T23:59:59.000Z

    responses. Investigation of the performance of thruster-assisted moored offshore platforms was conducted in terms of six-degree-of-freedom motions and mooring line/riser top tensions by means of a fully coupled hull/mooring/riser dynamic analysis program...

  11. Determination of efficiency of anechoic or decoupling hull coatings using water tank acoustic measurements

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Determination of efficiency of anechoic or decoupling hull coatings using water tank acoustic and radiated noise, respectively. Measurement of test panels in a water tank gives only the reflection in a water tank has already been presented in a previous paper [2]. The purpose of the present paper

  12. Advanced Perception, Navigation and Planning for Autonomous In-Water Ship Hull Inspection

    E-Print Network [OSTI]

    Kaess, Michael

    commercialized at scale. On the other hand, unmanned underwater vehicles have become extraordinarily capable. Leonard Abstract Inspection of ship hulls and marine structures using autonomous underwater vehicles has-capacity com- munications, autonomous underwater vehicles (AUVs) move freely and therefore usually require on

  13. EFFICACY AND TIMING OF FUNGICIDES, BACTERICIDES, AND BIOLOGICALS for DECIDUOUS TREE FRUIT, NUT, STRAWBERRY, AND VINE CROPS 2010

    E-Print Network [OSTI]

    Adaskaveg, James E; Gubler, W D; Michailides, Themis J.; Holtz, Brent A.

    2010-01-01T23:59:59.000Z

    cane and leafspot Phomopsis fruit rot and dieback PowderyStrawberry Pome and stone fruit crops including almond;BIOLOGICALS for DECIDUOUS TREE FRUIT, NUT, STRAWBERRY, AND

  14. Efficacy and Timing of Fungicides, Bactericides, and Biologicals for Decidous Tree Fruit, Nut, Strawberry, and Vine Crops

    E-Print Network [OSTI]

    Adaskaveg, Jim; Gubler, Doug; Michailides, Themis; Holtz, Brent

    2008-01-01T23:59:59.000Z

    and Biological Tables for Fruit, Nut, Strawberry, and VinePistachio Kiwifruit Stone fruits Almond, apricot, pruneApricot, grapevine Pome fruit (apple, pear, quince, etc. )

  15. Hollow spherical shell manufacture

    DOE Patents [OSTI]

    O'Holleran, Thomas P. (Belleville, MI)

    1991-01-01T23:59:59.000Z

    A process for making a hollow spherical shell of silicate glass composition in which an aqueous suspension of silicate glass particles and an immiscible liquid blowing agent is placed within the hollow spherical cavity of a porous mold. The mold is spun to reduce effective gravity to zero and to center the blowing agent, while being heated so as to vaporize the immiscible liquid and urge the water carrier of the aqueous suspension to migrate into the body of the mold, leaving a green shell compact deposited around the mold cavity. The green shell compact is then removed from the cavity, and is sintered for a time and a temperature sufficient to form a silicate glass shell of substantially homogeneous composition and uniform geometry.

  16. Hollow spherical shell manufacture

    DOE Patents [OSTI]

    O'Holleran, T.P.

    1991-11-26T23:59:59.000Z

    A process is disclosed for making a hollow spherical shell of silicate glass composition in which an aqueous suspension of silicate glass particles and an immiscible liquid blowing agent is placed within the hollow spherical cavity of a porous mold. The mold is spun to reduce effective gravity to zero and to center the blowing agent, while being heated so as to vaporize the immiscible liquid and urge the water carrier of the aqueous suspension to migrate into the body of the mold, leaving a green shell compact deposited around the mold cavity. The green shell compact is then removed from the cavity, and is sintered for a time and a temperature sufficient to form a silicate glass shell of substantially homogeneous composition and uniform geometry. 3 figures.

  17. Oxide Shell Reduction and Magnetic Property Changes in Core-Shell...

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

    Shell Reduction and Magnetic Property Changes in Core-Shell Fe Nanoclusters under Ion Irradiation. Oxide Shell Reduction and Magnetic Property Changes in Core-Shell Fe Nanoclusters...

  18. The readers point vessel: hull analysis of an eighteenth century merchant sloop excavated in St. Ann's Bay, Jamaica

    E-Print Network [OSTI]

    Cook, Gregory D.

    1997-01-01T23:59:59.000Z

    's Bay, Jamaica in 1994. Excavators removed overburden and the ballast pile, recovering over 600 artifacts associated with the vessel-After exposing well-preserved hull remains, divers recorded the ship's structure. The vessel is preserved from the base...

  19. CLASSIFICATION OF CLOSED AND OPEN-SHELL (TURKISH) PISTACHIO NUTS USING DOUBLE TREE UN-DECIMATED WAVELET TRANSFORM

    E-Print Network [OSTI]

    Minnesota, University of

    and frequency components using Dual-Tree un-decimated wavelet transform. The most discriminative features from the dual tree nodes are selected by a greedy search algorithm that combines a structural pruning onto a steel plate and the resulting acoustic signals are recorded. During the off-line training

  20. The Extended Thermodynamic Phase Structure of Taub-NUT and Taub-Bolt

    E-Print Network [OSTI]

    Clifford V. Johnson

    2014-06-17T23:59:59.000Z

    We study aspects of the extended gravitational thermodynamics for the Taub-NUT and Taub-Bolt geometries in four dimensional locally anti-de Sitter spacetime, where the cosmological constant is treated as a dynamical pressure. Attention is paid to the phase structure in the (p,T) plane, which has a line of first order phase transitions extending from the origin. We argue for a dynamical interpretation of the unstable physics in the negative specific heat region. A deformation corresponding to a dyonic Taub-NUT/Bolt system is also explored, and the effect of the deformation on the phase diagram is characterised.

  1. Some factors affecting hickory shuckworm diapause termination and parasites of hickory shuckworm and pecan nut casebearer

    E-Print Network [OSTI]

    Gunasena, Galpathege Harshani

    1985-01-01T23:59:59.000Z

    nut casebearer seems to vary with location and the year. Twenty six species of primary parasites and 5 species of hyperparasites were found in Br~, Texas (Nickels et al. 1950). Gill (1930) reported sane parasites of this pest in Georgia..., 6. 9 5 of the larvae in dropped nuts during NayMeptemberf and 17 4 of the overwintering larvae were parasitized. However, the species of parasites were not reported. Nickels et al. (1950) found 7 parasites in his survey during 1929-1934. 9 P t...

  2. 50Are U Still Nuts? That's right... It's time for more unit conversion exercises!

    E-Print Network [OSTI]

    or generate electricity using solar panels. Although astronomers use ergs and centimeter units, solar energy50Are U Still Nuts? That's right... It's time for more unit conversion exercises! Problem 1: The Solar Constant is the amount of energy that the sun delivers to the surface of Earth each second

  3. Stability of charged thin shells

    SciTech Connect (OSTI)

    Eiroa, Ernesto F. [Instituto de Astronomia y Fisica del Espacio, C.C. 67, Suc. 28, 1428, Buenos Aires (Argentina); Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria Pab. I, 1428, Buenos Aires (Argentina); Simeone, Claudio [Departamento de Fisica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria Pab. I, 1428, Buenos Aires (Argentina); IFIBA, CONICET, Ciudad Universitaria Pab. I, 1428, Buenos Aires (Argentina)

    2011-05-15T23:59:59.000Z

    In this article we study the mechanical stability of spherically symmetric thin shells with charge, in Einstein-Maxwell and Einstein-Born-Infeld theories. We analyze linearized perturbations preserving the symmetry, for shells around vacuum and shells surrounding noncharged black holes.

  4. Recent Advances in Shell Evolution with Shell-Model Calculations

    E-Print Network [OSTI]

    Yutaka Utsuno; Takaharu Otsuka; Yusuke Tsunoda; Noritaka Shimizu; Michio Honma; Tomoaki Togashi; Takahiro Mizusaki

    2014-09-16T23:59:59.000Z

    Shell evolution in exotic nuclei is investigated with large-scale shell-model calculations. After presenting that the central and tensor forces produce distinctive ways of shell evolution, we show several recent results: (i) evolution of single-particle-like levels in antimony and cupper isotopes, (ii) shape coexistence in nickel isotopes understood in terms of configuration-dependent shell structure, and (iii) prediction of the evolution of the recently established $N=34$ magic number towards smaller proton numbers. In any case, large-scale shell-model calculations play indispensable roles in describing the interplay between single-particle character and correlation.

  5. An Analysis of Wind Power Development in the Town of Hull, MA

    SciTech Connect (OSTI)

    Adams, Christopher

    2013-06-30T23:59:59.000Z

    Over the past three decades the Town of Hull, MA has solidified its place in U.S. wind energy history through its leadership in community-based generation. This is illustrated by its commissioning of the first commercial-scale wind turbine on the Atlantic coastline, the first suburban-sited turbine in the continental United States, pursuit of community-based offshore wind, and its push toward creating an energy independent community. The town's history and demographics are briefly outlined, followed by experience in projects to provide wind power, including pre-construction and feasibility efforts, financial aspects, and market/industry factors.

  6. Convex Hull of N Planar Brownian Motions: Exact Results and an Application to Ecology

    E-Print Network [OSTI]

    Julien Randon-Furling; Satya N. Majumdar; Alain Comtet

    2009-10-01T23:59:59.000Z

    We compute exactly the mean perimeter and area of the convex hull of N independent planar Brownian paths each of duration T, both for open and closed paths. We show that the mean perimeter = \\alpha_N, \\sqrt{T} and the mean area = \\beta_N T for all T. The prefactors \\alpha_N and \\beta_N, computed exactly for all N, increase very slowly (logarithmically) with increasing N. This slow growth is a consequence of extreme value statistics and has interesting implication in ecological context in estimating the home range of a herd of animals with population size N.

  7. Accelerating Taub-NUT and Eguchi-Hanson solitons in four dimensions

    SciTech Connect (OSTI)

    Chng, Brenda [Department of Physics, National University of Singapore 2 Science Drive 3, Singapore 117542 (Singapore); Mann, Robert [Perimeter Institute for Theoretical Physics 31 Caroline St. N. Waterloo, Ontario N2L 2Y5 (Canada); Department of Physics, University of Waterloo 200 University Avenue West, Waterloo, Ontario N2L 3G1 (Canada); Stelea, Cristian [Department of Physics, University of Waterloo 200 University Avenue West, Waterloo, Ontario N2L 3G1 (Canada)

    2006-10-15T23:59:59.000Z

    We construct new solutions of the vacuum Einstein field equations in four dimensions via a solution-generating method utilizing the SL(2,R) symmetry of the reduced Lagrangian. We apply the method to an accelerating version of the Zipoy-Voorhees solution and generate new solutions which we interpret to be the accelerating versions of the Zipoy-Voorhees generalization of the Taub-NUT solution (with Lorentzian signature) and the Zipoy-Voorhees generalization of the Eguchi-Hanson solitons (with Euclidean signature). As an intermediary in the solution-generating process we obtain charged versions of the accelerated Zipoy-Voorhees-like families of solutions. Finally we present the accelerating version of the Taub-NUT solution and discuss its properties.

  8. Accelerating Taub-NUT and Eguchi-Hanson solitons in four dimensions

    E-Print Network [OSTI]

    Brenda Chng; Robert Mann; Cristian Stelea

    2006-08-19T23:59:59.000Z

    We construct new solutions of the vacuum Einstein field equations in four dimensions via a solution generating method utilizing the SL(2,R) symmetry of the reduced Lagrangian. We apply the method to an accelerating version of the Zipoy-Voorhees solution and generate new solutions which we interpret to be the accelerating versions of the Zipoy-Voorhees generalisation of the Taub-NUT solution (with Lorentzian signature) and the Zipoy-Voorhees generalisation of the Eguchi-Hanson solitons (with Euclidean signature). As an intermediary in the solution-generating process we obtain charged versions of the accelerated Zipoy-Voorhees-like families of solutions. Finally we present the accelerating version of the Taub-NUT solution and discuss its properties.

  9. Thermodynamic Volumes for AdS-Taub-NUT and AdS-Taub-Bolt

    E-Print Network [OSTI]

    Clifford V. Johnson

    2014-08-27T23:59:59.000Z

    In theories of semi-classical quantum gravity where the cosmological constant is considered a thermodynamic variable, the gravitational mass of a black hole has been shown to correspond to the enthalpy of the thermodynamic system, rather than the energy. We propose that this should be extended to all spacetime solutions, and consider the meaning of this extension of gravitational thermodynamics for the Taub-NUT and Taub-Bolt geometries in four dimensional locally anti-de Sitter spacetime. We present formulae for their thermodynamic volumes. Surprisingly, Taub-NUT has negative volume, for which there is a natural dynamical explanation in terms of the process of formation of the spacetime. A special case corresponds to pure AdS_4 with an S^3 slicing. The same dynamical setting can explain the negative entropy known to exist for these solutions for a range of parameters.

  10. Shell to shell energy transfer in magnetohydrodynamic dynamo simulations

    E-Print Network [OSTI]

    Pouquet, Annick

    Shell to shell energy transfer in magnetohydrodynamic dynamo simulations Pablo Mininni, Alexandros 80307 (Dated: May 5, 2005) We study the transfer of energy between different scales for forced three, and which scales of the magnetic field receive energy directly from the velocity field and which scales

  11. EFFICACY AND TIMING OF FUNGICIDES, BACTERICIDES, AND BIOLOGICALS for DECIDUOUS TREE FRUIT, NUT, STRAWBERRY, AND VINE CROPS 2010 (updated 5/1/10)

    E-Print Network [OSTI]

    Adaskaveg, James E; Gubler, W D; Michailides, Themis J.; Holtz, Brent A.

    2010-01-01T23:59:59.000Z

    Used on Deciduous Tree Fruit, Nut, Strawberry, and VineKiwifruit Almond and other stone fruits Grapevine StrawberryApricot, grapevine Pome fruit (apple, pear, quince, etc. )

  12. EFFICACY AND TIMING OF FUNGICIDES,BACTERICIDES, AND BIOLOGICALS for DECIDUOUS TREE FRUIT, NUT, STRAWBERRY, AND VINE CROPS 2010 (rev. April 1, 2010)

    E-Print Network [OSTI]

    Adaskaveg, J E; Gubler, W D; Michailides, Themis J.; Holtz, Brent A.

    2010-01-01T23:59:59.000Z

    cane and leafspot Phomopsis fruit rot and dieback PowderyStrawberry Pome and stone fruit crops including almond;BIOLOGICALS for DECIDUOUS TREE FRUIT, NUT, STRAWBERRY, AND

  13. Shell Hoop Prestress Generated by Welding

    E-Print Network [OSTI]

    Meuser, R.B.

    2011-01-01T23:59:59.000Z

    to allow determination of a shell-to-yoke coefficient ofAluminum plates clamp the shell pieces against the yoke forType 304 stainless steel shell halves 5 in. long and 1/4 in.

  14. An electron microscopy study of ground-nut poisoning in turkey poults

    E-Print Network [OSTI]

    Martin, Alcides Amilcar

    1963-01-01T23:59:59.000Z

    etiology. In the eat'Ly papers the condition was known by the name of Turkey ' X" disease. However, this name was quickly changed when in L961 Blount (7) concluded that toxic Brasilian ground-nut meal was responsible for the outbreaks of this new... condition. Similar toxic effects in ducklings, chickens, rats, guinea pigs, cows and pigs have also been reported. In general, there is little available information about how and where tbe toxic principles of any kind act in the cells structures. Also...

  15. Optimum rotationally symmetric shells for flywheel rotors

    DOE Patents [OSTI]

    Blake, Henry W. (Oak Ridge, TN)

    2000-01-01T23:59:59.000Z

    A flywheel rim support formed from two shell halves. Each of the shell halves has a disc connected to the central shaft. A first shell element connects to the disc at an interface. A second shell element connects to the first shell element. The second shell element has a plurality of meridional slits. A cylindrical shell element connects to the second shell element. The cylindrical shell element connects to the inner surface of the flywheel rim. A flywheel rim support having a disc connected an outer diameter of a shaft. Two optimally shaped shell elements connect to the optimally shaped disc at an interface. The interface defines a discontinuity in a meridional slope of said support. A cylindrical shell element connects to the two shell elements. The cylindrical shell element has an outer surface for connecting to the inner surface of the flywheel rim. A flywheel rim casing includes an annular shell connected to the central shaft. The annular shell connects to the flywheel rim. A composite shell surrounds the shaft, annular shell and flywheel rim.

  16. Insulative laser shell coupler

    DOE Patents [OSTI]

    Arnold, P.A.; Anderson, A.T.; Alger, T.W.

    1994-09-20T23:59:59.000Z

    A segmented coaxial laser shell assembly having at least two water jacket sections, two pairs of interconnection half rings, a dielectric break ring, and a pair of threaded ring sections is disclosed. Each water jacket section with an inner tubular section that defines an inner laser cavity with water paths adjacent to at least a portion of the exterior of the inner tubular section, and mating faces at the end of the water jacket section through which the inner laser cavity opens and which defines at least one water port therethrough in communication with the water jackets. The water paths also define in their external surface a circumferential notch set back from and in close proximity to the mating face. The dielectric break ring has selected thickness and is placed between, and in coaxial alignment with, the mating faces of two of the adjacent water jacket sections. The break ring also defines an inner laser cavity of the same size and shape as the inner laser cavity of the water jacket sections and at least one water passage through the break ring to communicate with at least one water port through the mating faces of the water jacket sections. 4 figs.

  17. An EndtoEnd QoS Model and Management Architecture David Hull Arjun Shankar Klara Nahrstedt Jane W. S. Liu

    E-Print Network [OSTI]

    Nahrstedt, Klara

    . S. Liu Department of Computer Science University of Illinois Urbana, IL 61801 Abstract A qualityAn End­to­End QoS Model and Management Architecture David Hull Arjun Shankar Klara Nahrstedt Jane W

  18. Stability of elastic grid shells

    E-Print Network [OSTI]

    Mesnil, Romain, M. Eng. Massachusetts Institute of Technology

    2013-01-01T23:59:59.000Z

    The elastic grid shell is a solution that combines double curvature and ease of mounting. This structural system, based on the deformation of an initially at grid without shear stiffness was invented more than fifty years ...

  19. The Storage of Shelled Pecans.

    E-Print Network [OSTI]

    Brison, Fred R. (Fred Robert)

    1945-01-01T23:59:59.000Z

    AGRIC - KPERIA .. -. STATIC t,4L EI rlENT ! C. H. MCUOSELL, Act~ng mrector Collegz Station. Texas 'LLETIN NO. 667 MARCH, THE STORAGE OF SHELLED PEC-4NS FRED R. BRISON Division of Horticulture . AGRICULTURAL AND MECHANICAL COLLEGE OF TE... Gibb Gilchrist, President [Blank Page in Original Bulletin] Shelled pecans may change in flavor, texture, and color, while in storage. They may also change as a result of insect or disease damage. Kernels change in flavor by becoming progressively...

  20. Are Hadrons Shell-Structured? Paolo Palazzi

    E-Print Network [OSTI]

    Are Hadrons Shell-Structured? Paolo Palazzi particlez.org, PO Box 62, CH-1217 Meyrin 1, Switzerland atoms and nuclei, are shell-structured. The mesonic shells mass series, combined with the results of a mass quantization analysis, reveals striking similarities with the nuclear shells. In addition

  1. An Analysis of Wind Power Development in the Town of Hull, MA_Appendix 4_Geophysical Survey Report

    SciTech Connect (OSTI)

    Adams, Christopher

    2013-06-30T23:59:59.000Z

    CR Environmental, Inc. (CR) was contracted by GZA GeoEnvironmental, Inc. (GZA) to perform hydrographic and geophysical surveys of an approximately 3.35 square mile area off the eastern shore of Hull, Massachusetts. Survey components included: Single-beam bathymetry; 100-kHz and 500-kHz side scan sonar; Magnetometry; and Low to mid-frequency sub-bottom profiling.

  2. Foam shell project: Progress report

    SciTech Connect (OSTI)

    Overturf, G.; Reibold, B.; Cook, B. [Lawrence Livermore National Lab., CA (United States); Schroen-Carey, D. [WJSA (United States)

    1994-03-25T23:59:59.000Z

    The authors report on their work to produce a foam shell target for two possible applications: (1) as liquid-layered cryogenic target on Omega Upgrade, and (2) as a back-up design for the NIF. This target consists of a roughly 1 mm diameter and 100 {mu}m thick spherical low-density foam shell surrounding a central void. The foam will be slightly overfilled with liquid D{sub 2} or DT, the overfilled excess being symmetrically distributed on the inside of the shell and supported by thermal gradient techniques. The outside of the foam is overcoated with full density polymer which must be topologically smooth. The technology for manufacturing this style of foam shell involves microencapsulation techniques and has been developed by the Japanese at ILE. Their goal is to determine whether this technology can be successfully adapted to meet US ICF objectives. To this end a program of foam shell development has been initiated at LLNL in collaboration with both the General Atomics DOE Target Fabrication Contract Corporation and the Target Fabrication Group at LLE.

  3. Studying Brazil-Nut Effect History Line using Disk-Formed Objects, Scanner, and Web Browser

    E-Print Network [OSTI]

    Sparisoma Viridi; Siti Nurul Khotimah; Novitrian; Widayani; Luman Haris; Dimas Praja Purwa Aji

    2014-08-07T23:59:59.000Z

    Grains configuration snapshots of Brazil-nut effect (BNE) in two-dimension are physically modeled using disk-formed objects, e.g., buttons and magnetic pin. These BNE configurations are artificially designed to mimic the real ones observed in experiments. A computer scanner is used to capture the configurations. Obtained images are then digitized using web browser running a HTML equipped with a JavaScript code, which is built mainly only for this work. From digitization process all grains positions (granular bed and intruder) are obtained, which is later analyzed using the simplest model, i.e., potential energy. Since the minimum energy principle (MEP) suggests that a closed system should go to its state with minimum internal energy, our BNE system must also obey it. Evolution of only the intruder seems to violate MEP but not for the whole system. Grains compaction plays important role, so that the system can achieve its configuration with minimum potential energy.

  4. Shell model Monte Carlo methods

    SciTech Connect (OSTI)

    Koonin, S.E. [California Inst. of Tech., Pasadena, CA (United States). W.K. Kellogg Radiation Lab.; Dean, D.J. [Oak Ridge National Lab., TN (United States)

    1996-10-01T23:59:59.000Z

    We review quantum Monte Carlo methods for dealing with large shell model problems. These methods reduce the imaginary-time many-body evolution operator to a coherent superposition of one-body evolutions in fluctuating one-body fields; resultant path integral is evaluated stochastically. We first discuss the motivation, formalism, and implementation of such Shell Model Monte Carlo methods. There then follows a sampler of results and insights obtained from a number of applications. These include the ground state and thermal properties of pf-shell nuclei, thermal behavior of {gamma}-soft nuclei, and calculation of double beta-decay matrix elements. Finally, prospects for further progress in such calculations are discussed. 87 refs.

  5. Proposition 13 and The California Fiscal Shell Game

    E-Print Network [OSTI]

    McCubbins, Colin H; McCubbins, Mathew D

    2010-01-01T23:59:59.000Z

    and The California Fiscal Shell Game Notes Others, however,13 and The California Fiscal Shell Game References Abadie,13 and The California Fiscal Shell Game Kogan, Vladimir, and

  6. Past and future of grid shell structures

    E-Print Network [OSTI]

    Paoli, Cline (Cline Aude)

    2007-01-01T23:59:59.000Z

    Because of their original organic shape and the column free space that they provide, the design of grid shell structures challenges architects and structural engineers in more than one way. Very few grid shell building ...

  7. Applications of Continuum Shell Model

    E-Print Network [OSTI]

    Alexander Volya

    2006-05-16T23:59:59.000Z

    The nuclear many-body problem at the limits of stability is considered in the framework of the Continuum Shell Model that allows a unified description of intrinsic structure and reactions. Technical details behind the method are highlighted and practical applications combining the reaction and structure pictures are presented.

  8. Shell Formation and Bone Strength Laying Hens

    E-Print Network [OSTI]

    Shell Formation and Bone Strength in Laying Hens Effects of Age, Daidzein and Exogenous Estrogen Cover aquarelle: E. Spörndly-Nees #12;Shell Formation and Bone Strength in Laying Hens Effects of Age eggshells as shell quality declines with age during the laying period. This is a concern for food safety

  9. Facilities: NHMFL 9.4 Tesla Fourier Transform Ion Cyclotron Resonance Mass Spectrometer Citation: Characterization of Pine Pellet and Peanut Hull Pyrolysis of Bio-Oils by Negative-Ion Electrospray Ionization Fourier

    E-Print Network [OSTI]

    Weston, Ken

    with greater than 1% relative abundance in either phase are shown. Pyrolysis of solid biomass, in this case: Characterization of Pine Pellet and Peanut Hull Pyrolysis of Bio-Oils by Negative-Ion Electrospray Ionization of nitrogen-containing species identified in the peanut hull pyrolysis oil by FT-ICR mass spectrometry

  10. Turbine blade with spar and shell

    DOE Patents [OSTI]

    Davies, Daniel O. (Palm City, FL); Peterson, Ross H. (Loxahatchee, FL)

    2012-04-24T23:59:59.000Z

    A turbine blade with a spar and shell construction in which the spar and the shell are both secured within two platform halves. The spar and the shell each include outward extending ledges on the bottom ends that fit within grooves formed on the inner sides of the platform halves to secure the spar and the shell against radial movement when the two platform halves are joined. The shell is also secured to the spar by hooks extending from the shell that slide into grooves formed on the outer surface of the spar. The hooks form a serpentine flow cooling passage between the shell and the spar. The spar includes cooling holes on the lower end in the leading edge region to discharge cooling air supplied through the platform root and into the leading edge cooling channel.

  11. Asymptotic safety goes on shell

    E-Print Network [OSTI]

    Dario Benedetti

    2011-11-11T23:59:59.000Z

    It is well known in quantum field theory that the off-shell effective action depends on the gauge choice and field parametrization used in calculating it. Nevertheless, the typical scheme in which the scenario of asymptotically safe gravity is investigated is an off-shell version of the functional renormalization group equation. Working with the Einstein-Hilbert truncation as a test bed, we develop a new scheme for the analysis of asymptotically safe gravity in which the on-shell part of the effective action is singled out and we show that the beta function for the essential coupling has no explicit gauge-dependence. In order to reach our goal, we introduce several technical novelties, including a different decomposition of the metric fluctuations, a new implementation of the ghost sector, and a new cut-off scheme. We find a non-trivial fixed point, with a value of the cosmological constant which is independent of the gauge-fixing parameters.

  12. An Analysis of Wind Power Development in the Town of Hull, MA, Appendix 2: LaCapra Financial Study

    SciTech Connect (OSTI)

    Adams, Christopher

    2013-06-30T23:59:59.000Z

    The financial analysis and summary results presented in this document represent a first cut at an economic assessment of the proposed Hull Offshore Wind Project. Wind turbine price increases have outpaced the materials and labor price pressures faced by nonrenewable power plant developers due to increased demands on a limited pool of turbine manufacturers and offshore installation companies. Moreover, given the size of the proposed offshore facility, it may be difficult to contract with turbine manufacturers and/or foundation companies given the size and scope of competing worldwide demand. The results described in this report assume that such conditions will not significantly impact the prices that will have to be received from the output of the project; rather, the project size may require as a prerequisite that Hull be able to piggyback on other offshore efforts. The financial estimates provided here necessarily feature a range due to uncertainty in a number of project assumptions as well as overall uncertainty in offshore wind costs. Nevertheless, taken together, the analysis provides a ballpark revenue requirement of approximately $157/MWh for the municipal financing option, with higher estimates possible assuming escalation in costs to levels higher than assumed here.

  13. Colloidal liquids of yolk-shell particles

    E-Print Network [OSTI]

    L. E. Sanchez Diaz; E. C. Cortes-Morales; X. Li; Wei-Ren Chen; M. Medina-Noyola

    2014-07-23T23:59:59.000Z

    In this paper we develop statistical mechanical tools to describe the intermediate- and long-time collective- and self-diffusion properties of a liquid of strongly-interacting hollow spherical particles (shells), each bearing a smaller solid sphere (yolk) in its interior. To decouple two complex effects we assume that the hydrodynamic interactions can be accounted for through the effective short-time self-diffusion coefficients $D^0_s$ and $D^0_y$ that describe the short-time Brownian motion of the yolk and the shell particles, and develop a self-consistent generalized Langevin equation theory to describe the intermediate- and long-time effects of the direct shell-shell, yolk-shell and yolk-yolk interactions. In a concrete application, we consider the simplest yolk-shell model system involving purely repulsive hard-body interactions between all (shell and yolk) particles. Using a softened version of these interparticle potentials we perform Brownian dynamics simulations to determine the mean squared displacement of both types of particles, as well as the intermediate scattering function of the yolk-shell complex. We compare the theoretical and simulation results between them, and with the results for the same system in the absence of yolks. We find that the yolks, which have no effect on the shell-shell static structure, influences the dynamic properties in a predictable manner, fully captured by the theory.

  14. Nonlinear analysis of anisotropic shells of revolution

    E-Print Network [OSTI]

    Kelley, William Rhea

    1970-01-01T23:59:59.000Z

    Modifications REFERENCES BIBLIOGRAPHY VITA 25 34 41 48 54 55 56 57 LIST OF FIGURES Figure Page l. Shell Geometry 2. Positive Direction for Oisplacements 3. Positive Direction for Rotations 4. Positive Direction for Forces . . . 5. Positive... Direction for Moments 6 . Positive Direction for Loads 7. U Displacement for Conical Shell 8. M Displacement for Conical Shell . 9. M Displacement for Spherical Cap 10. I4 Displacement for 4. 5 psi Load, Linear and Nonlinear Solution . ll. Load vs M...

  15. The fragmentation of expanding shells I: Limitations of the thin--shell approximation

    E-Print Network [OSTI]

    Dale, James E; Whitworth, Anthony; Palous, Jan

    2009-01-01T23:59:59.000Z

    We investigate the gravitational fragmentation of expanding shells in the context of the linear thin--shell analysis. We make use of two very different numerical schemes; the FLASH Adaptive Mesh Refinement code and a version of the Benz Smoothed Particle Hydrodynamics code. We find that the agreement between the two codes is excellent. We use our numerical results to test the thin--shell approximation and we find that the external pressure applied to the shell has a strong effect on the fragmentation process. In cases where shells are not pressure--confined, the shells thicken as they expand and hydrodynamic flows perpendicular to the plane of the shell suppress fragmentation at short wavelengths. If the shells are pressure--confined internally and externally, so that their thickness remains approximately constant during their expansion, the agreement with the analytical solution is better.

  16. Enduring Stockpile CMM Shell Inspection Plan (U)

    SciTech Connect (OSTI)

    Montano, Joshua D. [Los Alamos National Laboratory; Flores, Randy A. [Los Alamos National Laboratory

    2012-06-13T23:59:59.000Z

    The slides are intended to serve as a high level summary of the CMM Shell Inspection Plan as presented to Pu Sustainment Legacy Pit Production IPT.

  17. Material with core-shell structure

    DOE Patents [OSTI]

    Luhrs, Claudia (Rio Rancho, NM); Richard, Monique N. (Ann Arbor, MI); Dehne, Aaron (Maumee, OH); Phillips, Jonathan (Rio Rancho, NM); Stamm, Kimber L. (Ann Arbor, MI); Fanson, Paul T. (Brighton, MI)

    2011-11-15T23:59:59.000Z

    Disclosed is a material having a composite particle, the composite particle including an outer shell and a core. The core is made from a lithium alloying material and the outer shell has an inner volume that is greater in size than the core of the lithium alloying material. In some instances, the outer mean diameter of the outer shell is less than 500 nanometers and the core occupies between 5 and 99% of the inner volume. In addition, the outer shell can have an average wall thickness of less than 100 nanometers.

  18. Mollusk Shell Nacre Ultrastructure Correlates with Environmental...

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

    was deposited. It is therefore possible that mollusk shell nacre could be used as a thermometer for modern and past climates. Once validated nacre could become a physical,...

  19. Transitional nuclei near shell closures

    SciTech Connect (OSTI)

    Mukherjee, G. [Variable Energy Cyclotron Centre, 1/AF Bidhan Nagar, Kolkata 700064 (India); Pai, H. [Variable Energy Cyclotron Centre, 1/AF Bidhan Nagar, Kolkata 700064, India and Present Address: Institut fr Kernphysik, Technische Universitt Darmstadt, Schlossgartenstrasse 9, 64289 Darmstadt (Germany)

    2014-08-14T23:59:59.000Z

    High spin states in Bismuth and Thallium nuclei near the Z = 82 shell closure and Cesium nuclei near the N = 82 shell closure in A = 190 and A = 130 regions, respectively, have been experimentally investigated using heavy-ion fusion evaporation reaction and by detecting the gamma rays using the Indian National Gamma Array (INGA). Interesting shape properties in these transitional nuclei have been observed. The results were compared with the neighboring nuclei in these two regions. The total Routhian surface (TRS) calculations have been performed for a better understanding of the observed properties. In mass region A = 190, a change in shape from spherical to deformed has been observd around neutron number N = 112 for the Bi (Z = 83) isotopes with proton number above the magic gap Z = 82, whereas, the shape of Tl (Z = 81) isotopes with proton number below the magic gap Z = 82 remains stable as a function of neutron number. An important transition from aplanar to planar configuration of angular momentum vectors leading to the occurance of nuclar chirality and magnetic rotation, respectively, has been proposed for the unique parity ?h{sub 11/2}??h{sub 11/2} configuration in Cs isotopes in the mass region A ? 130 around neutron number N = 79. These results are in commensurate with the TRS calculations.

  20. Apparatus and methods for installing, removing and adjusting an inner turbine shell section relative to an outer turbine shell section

    DOE Patents [OSTI]

    Leach, David (Niskayuna, NY); Bergendahl, Peter Allen (Scotia, NY); Waldo, Stuart Forrest (Salem, NC); Smith, Robert Leroy (Milford, OH); Phelps, Robert Kim (Milford, OH)

    2001-01-01T23:59:59.000Z

    A turbine includes upper and lower inner shell sections mounting the nozzles and shrouds and which inner shell is supported by pins secured to a surrounding outer shell. To disassemble the turbine for access to the inner shell sections and rotor, an alignment fixture is secured to the lower outer shell section and has pins engaging the inner shell section. To disassemble the turbine, the inner shell weight is transferred to the lower outer shell section via the alignment fixture and cradle pins. Roller assemblies are inserted through access openings vacated by support pins to permit rotation of the lower inner shell section out of and into the lower outer shell section during disassembly and assembly. The alignment fixture includes adjusting rods for adjusting the inner shell axially, vertically, laterally and about a lateral axis. A roller over-cage is provided to rotate the inner shell and a dummy shell to facilitate assembly and disassembly in the field.

  1. The integration of a geographic information system with a model predicting the life cycle of the pecan nut casebearer

    E-Print Network [OSTI]

    Redding, Robert W

    1993-01-01T23:59:59.000Z

    extension efforts in the pecan industry by giving predictions to all pecan growers. ACKNOWLEDGMENTS I would like to thank Dr. Robert Maggio for his support and the opportunity to excel. I would also like to thank my two other Texas A&M Faculty members..., Dr. Kenneth White and Dr. Vatche Tchakerian, who took the time to be on my committee. Thanks also to Dr. John Jackman, whose original pecan nut casebearer program I used as the basis for my research. To my parents, I give my love and admiration...

  2. Thick-shell nanocrystal quantum dots

    DOE Patents [OSTI]

    Hollingsworth, Jennifer A. (Los Alamos, NM); Chen, Yongfen (Eugene, OR); Klimov, Victor I. (Los Alamos, NM); Htoon, Han (Los Alamos, NM); Vela, Javier (Los Alamos, NM)

    2011-05-03T23:59:59.000Z

    Colloidal nanocrystal quantum dots comprising an inner core having an average diameter of at least 1.5 nm and an outer shell, where said outer shell comprises multiple monolayers, wherein at least 30% of the quantum dots have an on-time fraction of 0.80 or greater under continuous excitation conditions for a period of time of at least 10 minutes.

  3. Thin Shell Wormhole in Heterotic String Theory

    E-Print Network [OSTI]

    F. Rahaman; M. Kalam; S. Chakraborti

    2006-11-25T23:59:59.000Z

    Using 'Cut and Paste' technique, we develop a thin shell wormhole in heterotic string theory. We determine the surface stresses, which are localized in the shell, by using Darmois-Israel formalism. The linearized stability of this thin wormhole is also analyzed.

  4. The wave function of a gravitating shell

    E-Print Network [OSTI]

    V. I. Dokuchaev; S. V. Chernov

    2010-10-01T23:59:59.000Z

    We have calculated a discrete spectrum and found an exact analytical solution in the form of Meixner polynomials for the wave function of a thin gravitating shell in the Reissner-Nordstrom geometry. We show that there is no extreme state in the quantum spectrum of the gravitating shell, as in the case of extreme black hole.

  5. Porous Core-Shell Nanostructures for Catalytic Applications

    E-Print Network [OSTI]

    Ewers, Trevor David

    2012-01-01T23:59:59.000Z

    Titanium Incorporation within Silica Shell . 7.3 Pyridine5 Oxidative Growth of ZnO for Core-Shell Catalysis 5.13.3.2 Shell interaction dependent catalysis 3.3.3 Thermal

  6. Local shell-to-shell energy transfer via nonlocal Interactions in fluid turbulence

    E-Print Network [OSTI]

    Mahendra K. Verma; Arvind Ayyer; Olivier Debliquy; Shishir Kumar; Amar V. Chandra

    2005-10-19T23:59:59.000Z

    In this paper we analytically compute the strength of nonlinear interactions in a triad, and the energy exchanges between wavenumber shells in incompressible fluid turbulence. The computation has been done using first-order perturbative field theory. In three dimension, magnitude of triad interactions is large for nonlocal triads, and small for local triads. However, the shell-to-shell energy transfer rate is found to be local and forward. This result is due to the fact that the nonlocal triads occupy much less Fourier space volume than the local ones. The analytical results on three-dimensional shell-to-shell energy transfer match with their numerical counterparts. In two-dimensional turbulence, the energy transfer rates to the near-by shells are forward, but to the distant shells are backward; the cumulative effect is an inverse cascade of energy.

  7. Shelling in low dimensional manifolds

    E-Print Network [OSTI]

    Murray, William Owen

    1974-01-01T23:59:59.000Z

    topological n-cell. Note that each n-manifold is an n-manifold with boundary. The set of points of M which do not have a ~ 'Ebb hdh fbi g f h~bd fM. d fdby n Bd(M). The interior of M is denoted by Int(M) and defined by Int(M) = M ? Bd(M) . AMb-'fld. d f1... the style of the Proceedings of the American Mathematical Society. M and h n Bd(M) is an (n ? 1)-cell, then h is said to be free in M. Suppose S is a subset of M and T is a cellular decomposition of S. S can be shelled from M relative...

  8. Biocompatible core-shell magnetic nanoparticles for cancer treatment...

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

    Biocompatible core-shell magnetic nanoparticles for cancer treatment. Biocompatible core-shell magnetic nanoparticles for cancer treatment. Abstract: Non-toxic magnetic...

  9. Impact of External Heat-shielding Techniques on Shell Surface...

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

    External Heat-shielding Techniques on Shell Surface Temperatures and Dynamic Shell Thermal Deformation of Diesel Engine Emission Control Systems Impact of External Heat-shielding...

  10. Effect of the Ligand Shell Composition on the Dispersibility...

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

    the Ligand Shell Composition on the Dispersibility and Transport of Gold Nanocrystals in Near Critical Solvents. Effect of the Ligand Shell Composition on the Dispersibility and...

  11. Morphology and Electronic Structure of the Oxide Shell on the...

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

    Electronic Structure of the Oxide Shell on the Surface of Iron Nanoparticles. Morphology and Electronic Structure of the Oxide Shell on the Surface of Iron Nanoparticles. Abstract:...

  12. A Shell Model for Atomistic Simulation of Charge Transfer in...

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

    Shell Model for Atomistic Simulation of Charge Transfer in Titania. A Shell Model for Atomistic Simulation of Charge Transfer in Titania. Abstract: The derivation of atomistic...

  13. Morphology and Oxide Shell Structure of Iron Nanoparticles Grown...

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

    Oxide Shell Structure of Iron Nanoparticles Grown by Sputter-Gas-Aggregation. Morphology and Oxide Shell Structure of Iron Nanoparticles Grown by Sputter-Gas-Aggregation. Abstract:...

  14. Synthesis of Lutetium Phosphate/Apoferritin Core-Shell Nanoparticles...

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

    Lutetium PhosphateApoferritin Core-Shell Nanoparticles for Potential Applications in Radioimmunoimaging and Synthesis of Lutetium PhosphateApoferritin Core-Shell Nanoparticles...

  15. Nanoscale Alloying, Phase-Segregation, and Core-Shell Evolution...

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

    Alloying, Phase-Segregation, and Core-Shell Evolution of Gold-Platinum Nanoparticles and Their Electrocatalytic Effect Nanoscale Alloying, Phase-Segregation, and Core-Shell...

  16. Center of Mass Energy of the Collision for two Neutral Particles in the Background of a Kerr-Newman-Taub-NUT Black Hole

    E-Print Network [OSTI]

    Zakria, Ayesha

    2015-01-01T23:59:59.000Z

    In this paper, we investigate the center of mass energy of the collision for two neutral particles with different rest masses falling freely from rest at infinity in the background of a Kerr-Newman-Taub-NUT black hole. Further, we discuss the center of mass energy near the horizon(s) of an extremal and non-extremal Kerr-Newman-Taub-NUT black hole and show that an arbitrarily high center of mass energy is achievable under some restrictions. We will study the special case of the center of mass energy when the specific energy, specific angular momentum and Carter constant of both the particles are same.

  17. Center of Mass Energy of the Collision for two Neutral Particles in the Background of a Kerr-Newman-Taub-NUT Black Hole

    E-Print Network [OSTI]

    Ayesha Zakria; Mubasher Jamil

    2015-01-26T23:59:59.000Z

    In this paper, we investigate the center of mass energy of the collision for two neutral particles with different rest masses falling freely from rest at infinity in the background of a Kerr-Newman-Taub-NUT black hole. Further, we discuss the center of mass energy near the horizon(s) of an extremal and non-extremal Kerr-Newman-Taub-NUT black hole and show that an arbitrarily high center of mass energy is achievable under some restrictions. We will study the special case of the center of mass energy when the specific energy, specific angular momentum and Carter constant of both the particles are same.

  18. Wireless energy transfer between anisotropic metamaterials shells

    SciTech Connect (OSTI)

    Daz-Rubio, Ana; Carbonell, Jorge; Snchez-Dehesa, Jos, E-mail: jsdehesa@upv.es

    2014-06-15T23:59:59.000Z

    The behavior of strongly coupled Radial Photonic Crystals shells is investigated as a potential alternative to transfer electromagnetic energy wirelessly. These sub-wavelength resonant microstructures, which are based on anisotropic metamaterials, can produce efficient coupling phenomena due to their high quality factor. A configuration of selected constitutive parameters (permittivity and permeability) is analyzed in terms of its resonant characteristics. The coupling to loss ratio between two coupled resonators is calculated as a function of distance, the maximum (in excess of 300) is obtained when the shells are separated by three times their radius. Under practical conditions an 83% of maximum power transfer has been also estimated. -- Highlights: Anisotropic metamaterial shells exhibit high quality factors and sub-wavelength size. Exchange of electromagnetic energy between shells with high efficiency is analyzed. Strong coupling is supported with high wireless transfer efficiency. End-to-end energy transfer efficiencies higher than 83% can be predicted.

  19. Finite element analysis of shells with layers

    E-Print Network [OSTI]

    Hiller, Jean-Franois, 1974-

    2002-01-01T23:59:59.000Z

    It is well established that thin shell structures frequently feature narrow bands of strain concentration and localized displacement irregularities referred to as boundary and internal layers. It is crucial to capture these ...

  20. Flare Gas Recovery in Shell Canada Refineries

    E-Print Network [OSTI]

    Allen, G. D.; Wey, R. E.; Chan, H. H.

    1983-01-01T23:59:59.000Z

    Two of Shell Canada's refineries have logged about six years total operating experience with modern flare gas recovery facilities. The flare gas recovery systems were designed to recover the normal continuous flare gas flow for use in the refinery...

  1. Plan for shell + sensor New sensors calibration

    E-Print Network [OSTI]

    Hone, James

    ) Shells arrive Verify dimensions Remove ICRH chamber Build Cu Plas mount Install Cu Plasma Run Cu Plasma Wiki for progress Make HDA mounts VF coil spacer blocks Fix upper OH outer coil GDC chamber heater

  2. Expanding and Collapsing Scalar Field Thin Shell

    E-Print Network [OSTI]

    M. Sharif; G. Abbas

    2012-08-27T23:59:59.000Z

    This paper deals with the dynamics of scalar field thin shell in the Reissner-Nordstr$\\ddot{o}$m geometry. The Israel junction conditions between Reissner-Nordstr$\\ddot{o}$m spacetimes are derived, which lead to the equation of motion of scalar field shell and Klien-Gordon equation. These equations are solved numerically by taking scalar field model with the quadratic scalar potential. It is found that solution represents the expanding and collapsing scalar field shell. For the better understanding of this problem, we investigate the case of massless scalar field (by taking the scalar field potential zero). Also, we evaluate the scalar field potential when $p$ is an explicit function of $R$. We conclude that both massless as well as massive scalar field shell can expand to infinity at constant rate or collapse to zero size forming a curvature singularity or bounce under suitable conditions.

  3. Off-shell two loop QCD vertices

    E-Print Network [OSTI]

    J. A. Gracey

    2014-06-03T23:59:59.000Z

    We calculate the triple gluon, ghost-gluon and quark-gluon vertex functions at two loops in the MSbar scheme in the chiral limit for an arbitrary linear covariant gauge when the external legs are all off-shell.

  4. Wind pressure distribution on shell structures

    E-Print Network [OSTI]

    Yancey, Kenneth Earl, Jr

    1963-01-01T23:59:59.000Z

    relates to both cost and safety. This study has revealed that wind pressure criteria for shell structures is not adequately covered by most building codes. Those that do exist are rather vague and sometimes erroneous. One recently published design manual...

  5. Experimental study of upper sd shell nuclei and evolution of sd-fp shell gap

    SciTech Connect (OSTI)

    Sarkar, M. Saha [Saha Institute of Nuclear Physics, Kolkata - 700064 (India)

    2012-06-27T23:59:59.000Z

    The intruder orbitals from the fp shell play important role in the structure of nuclei around the line of stability in the upper sd shell. Experimentally we have studied {sup 35}Cl, {sup 30}P, {sup 36}Cl, {sup 37}Ar and {sup 34}Cl in this mass region using the INGA setup. Large basis cross-shell shell model calculations have indicated the need for change of the sd-fp energy gap for reliable reproduction of negative parity and high spin positive parity states. Indication of population of states of large deformation has been found in our data. Theoretical interpretation of these states has been discussed.

  6. Shell model study for neutron-rich sd-shell nuclei

    E-Print Network [OSTI]

    Kazunari Kaneko; Yang Sun; Takahiro Mizusaki; Munetake Hasegawa

    2011-01-08T23:59:59.000Z

    The microscopic structure of neutron-rich sd-shell nuclei is investigated by using the spherical shell-model in the sd-pf valence space with the extended pairing plus quadrupole-quadrupole forces accompanied by the monopole interaction (EPQQM). The calculation reproduces systematically the known energy levels for even-even and odd-mass nuclei including the recent data for 43S, 46S and 47Ar. In particular, the erosion of the N=28 shell closure in 42Si can be explained. Our EPQQM results are compared with other shell-model calculations with the SDPF-NR and SDPF-U effective interactions.

  7. Double shell tank waste analysis plan

    SciTech Connect (OSTI)

    Mulkey, C.H.; Jones, J.M.

    1994-12-15T23:59:59.000Z

    Waste analysis plan for the double shell tanks. SD-WM-EV-053 is Superseding SD-WM-EV-057.This document provides the plan for obtaining information needed for the safe waste handling and storage of waste in the Double Shell Tank Systems. In Particular it addresses analysis necessary to manage waste according to Washington Administrative Code 173-303 and Title 40, parts 264 and 265 of the Code of Federal Regulations.

  8. Local and Global Casimir Energies for a Semitransparent Cylindrical Shell

    E-Print Network [OSTI]

    Milton, Kim

    Local and Global Casimir Energies for a Semitransparent Cylindrical Shell In´es Cavero the -function shell, the local energy density diverges as the surface of the shell is approached; the divergence by physical boundaries, such as the Casimir energy due to a perfectly conducting spherical shell [1], has been

  9. Core-Shell Structured Magnetic Ternary Nanocubes

    SciTech Connect (OSTI)

    Wang, Lingyan; Wang, Xin; Luo, Jin; Wanjala, Bridgid N.; Wang, Chong M.; Chernova, Natalya; Engelhard, Mark H.; Liu, Yao; Bae, In-Tae; Zhong, Chuan-Jian

    2010-12-01T23:59:59.000Z

    While transition metal-doped ferrite nanoparticles constitute an important class of soft magnetic nanomaterials with spinel structures, the ability to control the shape and composition would enable a wide range of applications in homogeneous or heterogeneous reactions such as catalysis and magnetic separation of biomolecules. This report describes novel findings of an investigation of core-shell structured MnZn ferrite nanocubes synthesized in organic solvents by manipulating the reaction temperature and capping agent composition in the absence of the conventionally-used reducing agents. The core-shell structure of the highly-monodispersed nanocubes (~20 nm) are shown to consist of an Fe3O4 core and an (Mn0.5Zn0.5)(Fe0.9, Mn1.1)O4 shell. In comparison with Fe3O4 and other binary ferrite nanoparticles, the core-shell structured nanocubes were shown to display magnetic properties regulated by a combination of the core-shell composition, leading to a higher coercivity (~350 Oe) and field-cool/zero-field-cool characteristics drastically different from many regular MnZn ferrite nanoparticles. The findings are discussed in terms of the unique core-shell composition, the understanding of which has important implication to the exploration of this class of soft magnetic nanomaterials in many potential applications such as magnetic resonance imaging, fuel cells, and batteries.

  10. Non-Planar On-Shell Diagrams

    E-Print Network [OSTI]

    Sebastian Franco; Daniele Galloni; Brenda Penante; Congkao Wen

    2015-03-17T23:59:59.000Z

    We initiate a systematic study of non-planar on-shell diagrams in N=4 SYM and develop powerful technology for doing so. We introduce canonical variables generalizing face variables, which make the dlog form of the on-shell form explicit. We make significant progress towards a general classification of arbitrary on-shell diagrams by means of two classes of combinatorial objects: generalized matching and matroid polytopes. We propose a boundary measurement that connects general on-shell diagrams to the Grassmannian. Our proposal exhibits two important and non-trivial properties: positivity in the planar case and it matches the combinatorial description of the diagrams in terms of generalized matroid polytopes. Interestingly, non-planar diagrams exhibit novel phenomena, such as the emergence of constraints on Plucker coordinates beyond Plucker relations when deleting edges, which are neatly captured by the generalized matching and matroid polytopes. This behavior is tied to the existence of a new type of poles in the on-shell form at which combinations of Plucker coordinates vanish. Finally, we introduce a prescription, applicable beyond the MHV case, for writing the on-shell form as a function of minors directly from the graph.

  11. Plasmonic Enhancement of Dye-Sensitized Solar Cells Using Core-Shell-Shell Nanostructures

    E-Print Network [OSTI]

    Plasmonic Enhancement of Dye-Sensitized Solar Cells Using Core- Shell-Shell Nanostructures Stafford and demonstrate near-field plasmonic enhancement of dye-sensitized solar cells (DSSCs) incorporating them being researched, dye-sensitized solar cells (DSSCs) are a promising alternative to traditional solar

  12. CdTe, CdTe/CdS Core/Shell, and CdTe/CdS/ZnS Core/Shell/Shell Quantum Dots Study.

    E-Print Network [OSTI]

    Yan, Yueran

    2012-01-01T23:59:59.000Z

    ?? CdTe, CdTe/CdS core/shell, and CdTe/CdS/ZnS core/shell/shell quantum dots (QDs) are potential candidates for bio-imaging and solar cell applications because of some special physical properties (more)

  13. CIRCUMSTELLAR SHELL FORMATION IN SYMBIOTIC RECURRENT NOVAE

    SciTech Connect (OSTI)

    Moore, Kevin; Bildsten, Lars [Department of Physics, Broida Hall, University of California, Santa Barbara, CA 93106 (United States)

    2012-12-20T23:59:59.000Z

    We present models of spherically symmetric recurrent nova shells interacting with circumstellar material (CSM) in a symbiotic system composed of a red giant (RG) expelling a wind and a white dwarf accreting from this material. Recurrent nova eruptions periodically eject material at high velocities ({approx}> 10{sup 3} km s{sup -1}) into the RG wind profile, creating a decelerating shock wave as CSM is swept up. High CSM densities cause the shocked wind and ejecta to have very short cooling times of days to weeks. Thus, the late-time evolution of the shell is determined by momentum conservation instead of energy conservation. We compute and show evolutionary tracks of shell deceleration, as well as post-shock structure. After sweeping up all the RG wind, the shell coasts at a velocity {approx}100 km s{sup -1}, depending on system parameters. These velocities are similar to those measured in blueshifted CSM from the symbiotic nova RS Oph, as well as a few Type Ia supernovae that show evidence of CSM, such as 2006X, 2007le, and PTF 11kx. Supernovae occurring in such systems may not show CSM interaction until the inner nova shell gets hit by the supernova ejecta, days to months after the explosion.

  14. Removable inner turbine shell with bucket tip clearance control

    DOE Patents [OSTI]

    Sexton, Brendan F. (Clifton Park, NY); Knuijt, Hans M. (Niskayuna, NY); Eldrid, Sacheverel Q. (Saratoga Springs, NY); Myers, Albert (Amsterdam, NY); Coneybeer, Kyle E. (Schenectady, NY); Johnson, David Martin (Ballston Lake, NY); Kellock, Iain R. (Clifton Park, NY)

    2000-01-01T23:59:59.000Z

    A turbine includes a plurality of inner shell sections mounting first and second stage nozzle and shroud portions. The inner shell sections are pinned to an outer containment shell formed of sections to preclude circumferential movement of the inner shell relative to the outer shell and enable thermal expansion and contraction of the inner shell relative to the outer shell. Positive bucket tip clearance control is afforded by passing a thermal medium about the inner shell in heat transfer relation with the shrouds about the first and second stage bucket tips, the thermal medium being provided from a source of heating/cooling fluid independent of the turbine. Access is provided to the rotor and turbine buckets by removing the outer and inner shell sections.

  15. Curtis Frasier is the General Counsel of Shell Oil Company in the USA and Royal Dutch Shell's Upstream business throughout the Americas. He is currently

    E-Print Network [OSTI]

    Zhang, Junshan

    Oil Company in 1982, Curtis has held a number of positions within Shell's Legal Organization of Shell US Gas & Power. He has also served as a Director of Shell Oil Company, Shell Petroleum IncCurtis Frasier is the General Counsel of Shell Oil Company in the USA and Royal Dutch Shell

  16. Surface free energies for nematic shells

    E-Print Network [OSTI]

    Gaetano Napoli; Luigi Vergori

    2011-12-03T23:59:59.000Z

    We propose a continuum model to describe the molecular alignment in thin nematic shells. By contrast with previous accounts, the two-dimensional free energy, aimed at describing the physics of thin films of nematics deposited on curved substrates, is not postulated but it is deduced from the conventional three-dimensional theories of nematic liquid crystals. Both the director and the order-tensor theories are taken into account. The so-obtained surface energies exhibit extra terms compared to earlier models. These terms reflect the coupling of the geometry of the shell with the nematic order parameters. As expected, the shape of the shell plays a key role in the equilibrium configurations of nematics coating it.

  17. Shell-Based Support Structures for Nb3Sn Accelerator Quadrupole Magnets

    E-Print Network [OSTI]

    Ferracin, Paolo

    2010-01-01T23:59:59.000Z

    similarly to the outer shell, they significantly increasedof Technology Quadrupole Shell (TQS) Magnet Models forSHELL-BASED SUPPORT STRUCTURES FOR NB 3 SN ACCELERATOR

  18. Core/Shell heterojunction nanowire solar cell fabricated by lithographically patterned nanowire electrodeposition method

    E-Print Network [OSTI]

    Ghosh, Somnath

    2012-01-01T23:59:59.000Z

    Menke. Gold CoreSemiconductor Shell Nanowires Prepared bycarrier concentration in CIS shell at different depositionMerced Dissertation: Core/Shell Heterojunction Nanowires

  19. Filter diagonalization of shell-model calculations

    SciTech Connect (OSTI)

    Mizusaki, Takahiro [Institute of Natural Sciences, Senshu University, Tokyo 101-8425 (Japan); Kaneko, Kazunari [Department of Physics, Kyushu Sangyo University, Fukuoka 813-8503 (Japan); Honma, Michio [Center for Mathematical Sciences, University of Aizu, Aizu-Wakamatsu, 965-8580 (Japan); Sakurai, Tetsuya [Department of Computer Science, University of Tsukuba, Tsukuba, 305-8573 (Japan)

    2010-08-15T23:59:59.000Z

    We present a method of filter diagonalization for shell-model calculations. This method is based on the Sakurai and Sugiura (SS) method, but extended with the help of the shifted complex orthogonal conjugate gradient (COCG) method. A salient feature of this method is that it can calculate eigenvalues and eigenstates in a given energy interval. We show that this method can be an alternative to the Lanczos method for calculating ground and excited states, as well as spectral strength functions. With an application to the M-scheme shell-model calculations we demonstrate that several inherent problems in the widely used Lanczos method can be removed or reduced.

  20. Shell Model for Atomistic Simulation of Lithium Diffusion in...

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

    Shell Model for Atomistic Simulation of Lithium Diffusion in Mixed MnTi Oxides. Shell Model for Atomistic Simulation of Lithium Diffusion in Mixed MnTi Oxides. Abstract: Mixed...

  1. Incorporation of silica into baroplastic core-shell nanoparticles

    E-Print Network [OSTI]

    Hewlett, Sheldon A

    2006-01-01T23:59:59.000Z

    Core-shell baroplastics are nanophase materials that exhibit pressure-induced flow at low temperatures and high pressures. Core-shell baroplastics used in this work are comprised of a low Tg poly(butyl acrylate) (PBA) core ...

  2. Circumstellar Dust Shells Detlef Schonberner, Matthias Steffen

    E-Print Network [OSTI]

    Circumstellar Dust Shells Detlef Sch¨onberner, Matthias Steffen This research project is concerned spectra and intensity maps computed from the resulting time­dependent wind models can be compared directly as spherical grains of amor­ phous carbon with a radius of 0.05 ¯m, the adopted dust­ to­gas ratio being 1

  3. Continuous representation for shell models of turbulence

    E-Print Network [OSTI]

    Alexei A. Mailybaev

    2014-09-16T23:59:59.000Z

    In this work we construct and analyze continuous hydrodynamic models in one space dimension, which are induced by shell models of turbulence. After Fourier transformation, such continuous models split into an infinite number of uncoupled subsystems, which are all identical to the same shell model. The two shell models, which allow such a construction, are considered: the dyadic (Desnyansky--Novikov) model with the intershell ratio $\\lambda = 2^{3/2}$ and the Sabra model of turbulence with $\\lambda = \\sqrt{2+\\sqrt{5}} \\approx 2.058$. The continuous models allow understanding various properties of shell model solutions and provide their interpretation in physical space. We show that the asymptotic solutions of the dyadic model with Kolmogorov scaling correspond to the shocks (discontinuities) for the induced continuous solutions in physical space, and the finite-time blowup together with its viscous regularization follow the scenario similar to the Burgers equation. For the Sabra model, we provide the physical space representation for blowup solutions and intermittent turbulent dynamics.

  4. On-Shell Methods in Perturbative QCD

    E-Print Network [OSTI]

    Zvi Bern; Lance J. Dixon; David A. Kosower

    2007-05-30T23:59:59.000Z

    We review on-shell methods for computing multi-parton scattering amplitudes in perturbative QCD, utilizing their unitarity and factorization properties. We focus on aspects which are useful for the construction of one-loop amplitudes needed for phenomenological studies at the Large Hadron Collider.

  5. Non-Planar On-Shell Diagrams

    E-Print Network [OSTI]

    Franco, Sebastian; Penante, Brenda; Wen, Congkao

    2015-01-01T23:59:59.000Z

    We initiate a systematic study of non-planar on-shell diagrams in N=4 SYM and develop powerful technology for doing so. We introduce canonical variables generalizing face variables, which make the dlog form of the on-shell form explicit. We present a general classification of arbitrary on-shell diagrams in terms of two classes of combinatorial objects: generalized matching and matroid polytopes. We propose a boundary measurement that connects general on-shell diagrams to the Grassmannian. Our proposal exhibits two important and non-trivial properties: positivity in the planar case and its generalization for non-planar diagrams, and it matches the combinatorial description of the diagrams in terms of matroid polytopes. We present a comprehensive discussion of equivalence and reductions for non-planar diagrams and explain how they are captured by the generalized matching and matroid polytopes. Interestingly, non-planar diagrams exhibit novel phenomena, such as the emergence of constraints on Pl\\"ucker coordinat...

  6. Status of shell galaxies Jean-Louis Prieur

    E-Print Network [OSTI]

    Boyer, Edmond

    Status of shell galaxies Jean-Louis Prieur European Southern Observatory, Karl-Schwarzshild-Str 2 D-ellipticity . . . . . . . . . . . . . . . . . . . . . . . . . 7 II.3 Radial distribution of the shells . . . . . . . . . . . . . . . . . . . . . . . 9 III . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 IV IV. Spectroscopy of the shells 15 IV.1 Nature of the stellar population

  7. Stresses generated in cooling viscoelastic ice shells: Application to Europa

    E-Print Network [OSTI]

    Nimmo, Francis

    Stresses generated in cooling viscoelastic ice shells: Application to Europa F. Nimmo Department to cooling and the expansion of the shell due to the ice-water volume change. The former effect generates Citation: Nimmo, F. (2004), Stresses generated in cooling viscoelastic ice shells: Application to Europa, J

  8. Counter-rotating Kerr manifolds separated by a fluid shell

    E-Print Network [OSTI]

    J. P. Krisch; E. N. Glass

    2009-08-13T23:59:59.000Z

    We describe a spheroidal fluid shell between two Kerr vacuum regions which have opposite rotation parameters. The shell has a stiff equation of state and a heat flow vector related to the rotational Killing current. The shell description is useful in exploring the significance of counter-rotation in Kerr metric matches.

  9. On-Shell Unitarity Bootstrap for QCD Amplitudes

    E-Print Network [OSTI]

    Carola F. Berger; Zvi Bern; Lance J. Dixon; Darren Forde; David A. Kosower

    2006-10-16T23:59:59.000Z

    We describe the recently developed on-shell bootstrap for computing one-loop amplitudes in non-supersymmetric theories such as QCD. The method combines the unitarity method with loop-level on-shell recursion. The unitarity method is used to compute cut-containing parts of amplitudes, and on-shell recursion is used for the remaining rational terms.

  10. Assessment of Global Buckling and Fatigue Life for Steel Catenary RIser by Hull-Riser-Mooring Coupled Dynamic Analysis Program

    E-Print Network [OSTI]

    Eom, Taesung

    2013-08-01T23:59:59.000Z

    the related techniques, software, rules and regulations. They outlined the analysis flow in which the procedure is initiated by design basis and leads to fatigue analysis of SCR including VIV, VIM and motion fatigue, emphasizing 6 the shell element... compression, downward hang-off heave velocity is the target of measurement. Assuming the length is unit length, the equations for the parameter and the variables are as follows: 29 2 min 2 0net d drag Ter alF m g C D V?? ? ? ? ? ? ? 2 /Terminal d...

  11. On the intersection of the shell, collective and cluster models of atomic nuclei I: Multi-shell excitations

    E-Print Network [OSTI]

    J. Cseh

    2014-04-14T23:59:59.000Z

    The relation of the shell, collective and cluster models of the atomic nuclei is discussed from the viewpoint of symmetries. In the fifties the U(3) symmetry was found as their common part for a single shell problem. For multi major-shell excitations, considered here, the U(3)$\\otimes$U(3) dynamical symmetry turns out to be their intersection.

  12. Application of curium measurements for safeguarding at reprocessing plants. Study 1: High-level liquid waste and Study 2: Spent fuel assemblies and leached hulls

    SciTech Connect (OSTI)

    Rinard, P.M.; Menlove, H.O.

    1996-03-01T23:59:59.000Z

    In large-scale reprocessing plants for spent fuel assemblies, the quantity of plutonium in the waste streams each year is large enough to be important for nuclear safeguards. The wastes are drums of leached hulls and cylinders of vitrified high-level liquid waste. The plutonium amounts in these wastes cannot be measured directly by a nondestructive assay (NDA) technique because the gamma rays emitted by plutonium are obscured by gamma rays from fission products, and the neutrons from spontaneous fissions are obscured by those from curium. The most practical NDA signal from the waste is the neutron emission from curium. A diversion of waste for its plutonium would also take a detectable amount of curium, so if the amount of curium in a waste stream is reduced, it can be inferred that there is also a reduced amount of plutonium. This report studies the feasibility of tracking the curium through a reprocessing plant with neutron measurements at key locations: spent fuel assemblies prior to shearing, the accountability tank after dissolution, drums of leached hulls after dissolution, and canisters of vitrified high-level waste after separation. Existing pertinent measurement techniques are reviewed, improvements are suggested, and new measurements are proposed. The authors integrate these curium measurements into a safeguards system.

  13. Method of fabricating nested shells and resulting product

    DOE Patents [OSTI]

    Henderson, Timothy M. (Ann Arbor, MI); Kool, Lawrence B. (Ann Arbor, MI)

    1982-01-01T23:59:59.000Z

    A multiple shell structure and a method of manufacturing such structure wherein a hollow glass microsphere is surface treated in an organosilane solution so as to render the shell outer surface hydrophobic. The surface treated glass shell is then suspended in the oil phase of an oil-aqueous phase dispersion. The oil phase includes an organic film-forming monomer, a polymerization initiator and a blowing agent. A polymeric film forms at each phase boundary of the dispersion and is then expanded in a blowing operation so as to form an outer homogeneously integral monocellular substantially spherical thermoplastic shell encapsulating an inner glass shell of lesser diameter.

  14. Preheat of radiative shock in double-shell ignition targets

    SciTech Connect (OSTI)

    Li, J. W.; He, X. T. [Key Lab of High Energy Density Physics Simulation, Center for Applied Physics and Technology, Peking University, Beijing 100871 (China) [Key Lab of High Energy Density Physics Simulation, Center for Applied Physics and Technology, Peking University, Beijing 100871 (China); Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100094 (China); Pei, W. B.; Li, J. H.; Zheng, W. D.; Zhu, S. P. [Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100094 (China)] [Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100094 (China); Kang, W. [Key Lab of High Energy Density Physics Simulation, Center for Applied Physics and Technology, Peking University, Beijing 100871 (China)] [Key Lab of High Energy Density Physics Simulation, Center for Applied Physics and Technology, Peking University, Beijing 100871 (China)

    2013-08-15T23:59:59.000Z

    For the double-shell ignition target, the nonuniform preheat of the inner shell by high-energy x rays, especially the M-band line radiation and L-shell radiation from the Au hohlraum, aggravates the hydrodynamic instability that causes shell disruption. In this paper, for the first time, we propose another preheating mechanism due to the radiative shock formed in the CH foam, and also confirm and validate such preheat of radiative shock by numerical results. We also give an estimate of the improved double-shell in which the CH foam is replaced by the metallic foam to mitigate the hydrodynamic instabilities, and find that the radiative shock formed in the metallic foam produces a much stronger radiation field to preheat the inner shell, which plays a role in better controlling the instabilities. In double-shells, the preheat of radiative shock, as a potential effect on the instabilities, should be seriously realized and underlined.

  15. The robust assembly of small symmetric nano-shells

    E-Print Network [OSTI]

    Jef Wagner; Roya Zandi

    2014-10-03T23:59:59.000Z

    Highly symmetric nano-shells are found in many biological systems, such as clathrin cages and viral shells. Several studies have shown that symmetric shells appear in nature as a result of the free energy minimization of a generic interaction between their constituent subunits. We examine the physical basis for the formation of symmetric shells, and using a minimal model we demonstrate that these structures can readily grow from identical subunits under non equilibrium conditions. Our model of nano-shell assembly shows that the spontaneous curvature regulates the size of the shell while the mechanical properties of the subunit determines the symmetry of the assembled structure. Understanding the minimum requirements for the formation of closed nano-shells is a necessary step towards engineering of nano-containers, which will have far reaching impact in both material science and medicine.

  16. Enterprise, Shell scheduled to explore Romanian acreage

    SciTech Connect (OSTI)

    Not Available

    1992-08-17T23:59:59.000Z

    This paper reports that the pace of exploration is packing up in Romania's offshore and onshore sectors. Enterprise Oil Exploration Ltd., London, signed an exploration and production sharing agreement with state owned Rompetrol SA for two Black Sea blocks, Nos. XIII and XV, covering 3,000 sq km and 4,000 sq km, respectively. Shell Romania Exploration BV agreed with Rompetrol on an exploration and production sharing agreement for onshore Block 10. This covers 6,150 sq km in northern Transylvania. Shell's target will be deep formations underlying producing gas zones. Enterprise has a 65% share as operator of Blocks XIII and XV, while partner CanadianOxy (Romania) Ltd. holds the remaining 35%. Exploration and development costs will be borne by the license partners, while Rompetrol will take a share of any production.

  17. Understanding nuclei in the upper sd - shell

    SciTech Connect (OSTI)

    Sarkar, M. Saha; Bisoi, Abhijit; Ray, Sudatta [Nuclear Physics Division, Saha Institute of Nuclear Physics, Kolkata 700064 (India); Kshetri, Ritesh [Nuclear Physics Division, Saha Institute of Nuclear Physics, Kolkata 700064, India and Sidho-Kanho-Birsha University, Purulia - 723101 (India); Sarkar, S. [Indian Institute of Engineering Science and Technology, Shibpur, Howrah - 711103 (India)

    2014-08-14T23:59:59.000Z

    Nuclei in the upper-sd shell usually exhibit characteristics of spherical single particle excitations. In the recent years, employment of sophisticated techniques of gamma spectroscopy has led to observation of high spin states of several nuclei near A ? 40. In a few of them multiparticle, multihole rotational states coexist with states of single particle nature. We have studied a few nuclei in this mass region experimentally, using various campaigns of the Indian National Gamma Array setup. We have compared and combined our empirical observations with the large-scale shell model results to interpret the structure of these nuclei. Indication of population of states of large deformation has been found in our data. This gives us an opportunity to investigate the interplay of single particle and collective degrees of freedom in this mass region.

  18. Production technology experience in Shell's Michigan waterfloods

    SciTech Connect (OSTI)

    Barnes, P.F.; Tinker, G.E.

    1983-11-01T23:59:59.000Z

    Waterflooding started in the Niagaran carbonate reef oil reservoirs in Northern Michigan in 1978 with Shell's Chester 18 waterflood. Ten waterflood projects had been installed by the spring of 1983. As a result of this experience, significant production technology practices have become established. The majority of the waterflood experience has been in Shell's Gaylord Production Unit located primarily in Otsego and Crawford counties. Specifically, the projects discussed are the Chester 18, Chester 21, Frederic 10, Hayes 15, Hayes 21A, and Mid-Charlton 10 waterfloods. In general, the waterflood program can be characterized by: 1. Very favorable oil production response. 2. Timely and definitive surveillance techniques. 3. Systematic and timely well work on injectors and producers to maintain optimum reservoir withdrawal behavior. 4. Innovative application of artificial lift technology. 5. Aggressive future planning to maintain and improve oil production response.

  19. Production technology experience in Shell's Michigan waterfloods

    SciTech Connect (OSTI)

    Barnes, P.F.; Tinker, G.E.

    1983-01-01T23:59:59.000Z

    Waterflooding started in the Niagaran carbonate reef oil reservoirs in N. Michigan in 1978 with Shell's Chester 18 Waterflood. Ten waterflood projects had been installed by the spring of 1983. As a result of this experience, significant production technology practices have become established. The majority of the waterflood experience has been in Shell's Gaylord Production Unit located primarily in Otsego and Crawford counties. Specifically, the projects discussed are the Chester 18, Chester 21, Frederic 10, Hayes 15, Hayes 21A, and Mid-Charlton 10 waterfloods. In general, the waterflood program can be characterized by (1) a favorable oil production response, (2) timely and definitive surveillance techniques, (3) systematic and timely well work on injectors and producers to maintain optimum reservoir withdrawal behavior, (4) innovative application of artificial lift technology; and (5) aggressive future planning to maintain and improve oil production response.

  20. On-shell extension of distributions

    E-Print Network [OSTI]

    Dorothea Bahns; Micha? Wrochna

    2014-05-05T23:59:59.000Z

    We consider distributions on $\\R^n\\setminus{0}$ which satisfy a given set of partial differential equations and provide criteria for the existence of extensions to $\\R^n$ that satisfy the same set of equations on $\\R^n$. We use the results to construct distributions satisfying specific renormalisation conditions in the Epstein and Glaser approach to perturbative quantum field theory. Contrary to other approaches, we provide a unified apporach to treat Lorentz covariance, invariance under global gauge group and almost homogeneity, as well as discrete symmetries. We show that all such symmetries can be recovered by applying a linear map defined for all degrees of divergence. Using similar techniques, we find a relation between on-shell and off-shell time-ordered products involving higher derivatives of the fields.

  1. Jess, the Java expert system shell

    SciTech Connect (OSTI)

    Friedman-Hill, E.J.

    1997-11-01T23:59:59.000Z

    This report describes Jess, a clone of the popular CLIPS expert system shell written entirely in Java. Jess supports the development of rule-based expert systems which can be tightly coupled to code written in the powerful, portable Java language. The syntax of the Jess language is discussed, and a comprehensive list of supported functions is presented. A guide to extending Jess by writing Java code is also included.

  2. Relativistic R matrix and continuum shell model

    E-Print Network [OSTI]

    J. Grineviciute; Dean Halderson

    2014-04-16T23:59:59.000Z

    Background: The $R$ matrix formalism of Lane and Thomas has proven to be a convenient reaction theory for solving many-coupled channel systems. The theory provides solutions to bound states, scattering states, and resonances for microscopic models in one formalism. Purpose: The first purpose is to extend this formalism to the relativistic case so that the many-coupled channels problem may be solved for systems in which binary breakup channels satisfy a relative Dirac equation. The second purpose is to employ this formalism in a relativistic continuum shell model. Methods: Expressions for the collision matrix and the scattering amplitude, from which observables may be calculated, are derived. The formalism is applied to the 1p-1h relativistic continuum shell model with an interaction extracted from relativistic mean-field theory. Results: The simplest of the $\\sigma +\\omega +\\rho$ exchange interactions produces a good description of the single-particle energies in $^{16}$O and $^{90}$Zr and a reasonable description of proton scattering from $^{15}$N. Conclusions: The development of a calculable, relativistic $R$ matrix and its implementation in a $1p-1h$ relativistic continuum shell model provide a simple relatively self-consist, physically justifiable model for use in knockout reactions.

  3. Oxide shell reduction and magnetic property changes in core-shell Fe nanoclusters under ion irradiation

    SciTech Connect (OSTI)

    Sundararajan, Jennifer A.; Kaur, Maninder; Qiang, You, E-mail: youqiang@uidaho.edu [Department of Physics, University of Idaho, Moscow, Idaho 83844 (United States); Jiang, Weilin [Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352 (United States); McCloy, John S. [School of Mechanical and Materials Engineering, Washington State University, Pullman, Washington 99164 (United States)

    2014-05-07T23:59:59.000Z

    Ion irradiation effects are studied on the Fe-based core-shell nanocluster (NC) films with core as Fe and shell as Fe{sub 3}O{sub 4}/Fe{sub 3}N. These NC films were deposited on Si substrates to thickness of ?0.5 ?m using a NC deposition system. The films were irradiated at room temperature with 5.5?MeV Si{sup 2+} ions to ion fluences of 10{sup 15} and 10{sup 16} ions/cm{sup 2}. It is found that the irradiation induces grain growth, Fe valence reduction in the shell, and crystallization or growth of Fe{sub 3}N. The film retained its Fe-core and its ferromagnetic properties after irradiation. The nature and mechanism of oxide shell reduction and composition dependence after irradiation were studied by synthesizing additional NC films of Fe{sub 3}O{sub 4} and FeO?+?Fe{sub 3}N and irradiating them under the same conditions. The presence of nanocrystalline Fe is found to be a major factor for the oxide shell reduction. The surface morphologies of these films show dramatic changes in the microstructures due to cluster growth and agglomeration as a result of ion irradiation.

  4. suggesting that fibre may be the active fraction. In experiment 3, lucerne meal, oat hulls, beet pulp and wheat straw were compared, at the same level (7.8 p. 100) of dietary fibre. Only

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    of lucerne proteins by those of soyabean meal or milk powder in a balanced diet for growing rabbits of dehydrated lucerne meal (DLM) on diet utilization by growing rabbits. Sixty young male rabbits (N. Z. Whitesuggesting that fibre may be the active fraction. In experiment 3, lucerne meal, oat hulls, beet

  5. On the stability of thermonuclear shell sources in stars

    E-Print Network [OSTI]

    S. -C. Yoon; N. Langer; M. van der Sluys

    2004-06-07T23:59:59.000Z

    We present a quantitative criterion for the thermal stability of thermonuclear shell sources. We find the thermal stability of shell sources to depend on exactly three factors: they are more stable when they are geometrically thicker, less degenerate and hotter. This confirms and unifies previously obtained results in terms of the geometry, temperature and density of the shell source, by a simplified but quantitative approach to the physics of shell nuclear burning. We present instability diagrams in the temperature-density plane for hydrogen and helium shell burning, which allow a simple evaluation of the stability conditions of such shell sources in stellar models. The performance of our stability criterion is demonstrated in various numerical models: in a 3 Msun AGB star, in helium accreting CO white dwarfs, in a helium white dwarf which is covered by a thin hydrogen envelope, and in a 1.0 Msun giant.

  6. Effects of scars on crystalline shell stability under external pressure

    E-Print Network [OSTI]

    Duanduan Wan; Mark J. Bowick; Rastko Sknepnek

    2014-10-23T23:59:59.000Z

    We study how the stability of spherical crystalline shells under external pressure is influenced by the defect structure. In particular, we compare stability for shells with a minimal set of topologically-required defects to shells with extended defect arrays (grain boundary "scars" with non-vanishing net disclination charge). We perform Monte Carlo simulations to compare how shells with and without scars deform quasi-statically under external hydrostatic pressure. We find that the critical pressure at which shells collapse is lowered for scarred configurations that break icosahedral symmetry and raised for scars that preserve icosahedral symmetry. The particular shapes which arise from breaking of an initial icosahedrally-symmetric shell depend on the F\\"oppl-von K\\'arm\\'an number.

  7. Graded core/shell semiconductor nanorods and nanorod barcodes

    DOE Patents [OSTI]

    Alivisatos, A. Paul; Scher, Erik C.; Manna, Liberato

    2013-03-26T23:59:59.000Z

    Graded core/shell semiconductor nanorods and shapped nanorods are disclosed comprising Group II-VI, Group III-V and Group IV semiconductors and methods of making the same. Also disclosed are nanorod barcodes using core/shell nanorods where the core is a semiconductor or metal material, and with or without a shell. Methods of labeling analytes using the nanorod barcodes are also disclosed.

  8. Ground state energy fluctuations in the Nuclear Shell Model

    E-Print Network [OSTI]

    Victor Velazquez; Jorge G. Hirsch; Alejandro Frank; Jose Barea; Andres P. Zuker

    2005-03-29T23:59:59.000Z

    Statistical fluctuations of the nuclear ground state energies are estimated using shell model calculations in which particles in the valence shells interact through well defined forces, and are coupled to an upper shell governed by random 2-body interactions. Induced ground-state energy fluctuations are found to be one order of magnitude smaller than those previously associated with chaotic components, in close agreement with independent perturbative estimates based on the spreading widths of excited states.

  9. Proton-neutron pairing correlations in the nuclear shell model

    E-Print Network [OSTI]

    Lei Yang; S. Pittel; B. Thakur; N. Sandulescu; A. Poves; Yu-Min Zhao

    2010-06-16T23:59:59.000Z

    A shell-model study of proton-neutron pairing in f - p shell nuclei using a parametrized hamiltonian that includes deformation and spin-orbit effects as well as isoscalar and isovector pairing is reported. By working in a shell-model framework we are able to assess the role of the various modes of proton-neutron pairing in the presence of nuclear deformation without violating symmetries. Results are presented for $^{44}$Ti, $^{46}$Ti and $^{48}$Cr.

  10. Conical thin shell wormhole from global monopole: A theoretical construction

    E-Print Network [OSTI]

    F. Rahaman; M. Kalam; K. A. Rahman

    2008-11-10T23:59:59.000Z

    By applying 'Darmois-Israel formalism', we establish a new class of thin shell wormhole in the context of global monopole resulting from the breaking of a global O(3) symmetry. Since global monopole is asymptotically conical (no longer asymptotically flat), we call it as conical thin shell wormhole. Different characteristics of this conical thin shell wormhole, namely, time evolution of the throat, stability, total amount of exotic matter have been discussed.

  11. Graded core/shell semiconductor nanorods and nanorod barcodes

    DOE Patents [OSTI]

    Alivisatos, A. Paul (Oakland, CA); Scher, Erik C. (San Francisco, CA); Manna, Liberato (Lecce, IT)

    2010-12-14T23:59:59.000Z

    Graded core/shell semiconductor nanorods and shaped nanorods are disclosed comprising Group II-VI, Group III-V and Group IV semiconductors and methods of making the same. Also disclosed are nanorod barcodes using core/shell nanorods where the core is a semiconductor or metal material, and with or without a shell. Methods of labeling analytes using the nanorod barcodes are also disclosed.

  12. On the stability of thin-shell wormholes

    E-Print Network [OSTI]

    Peter K. F. Kuhfittig

    2014-12-18T23:59:59.000Z

    A thin-shell wormhole is theoretically constructible by surgically grafting together two Schwarzschild spacetimes using the so-called cut-and-paste technique. By describing such a wormhole as a limiting case of a constant-density spherical shell, it is shown that the structure must be unstable to linearized radial perturbations. Some earlier studies by the author et al. have shown, however, that under certain conditions, thin-shell wormholes can be stable.

  13. Casimir Energy of a Spherical Shell

    E-Print Network [OSTI]

    M. E. Bowers; C. R. Hagen

    1998-06-23T23:59:59.000Z

    The Casimir energy for a conducting spherical shell of radius $a$ is computed using a direct mode summation approach. An essential ingredient is the implementation of a recently proposed method based on Cauchy's theorem for an evaluation of the eigenfrequencies of the system. It is shown, however, that this earlier calculation uses an improper set of modes to describe the waves exterior to the sphere. Upon making the necessary corrections and taking care to ensure that no mathematically ill-defined expressions occur, the technique is shown to leave numerical results unaltered while avoiding a longstanding criticism raised against earlier calculations of the Casimir energy.

  14. Duality in Off-Shell Electromagnetism

    E-Print Network [OSTI]

    Martin Land

    2006-03-21T23:59:59.000Z

    In this paper, we examine the Dirac monopole in the framework of Off-Shell Electromagnetism, the five dimensional U(1) gauge theory associated with Stueckelberg-Schrodinger relativistic quantum theory. After reviewing the Dirac model in four dimensions, we show that the structure of the five dimensional theory prevents a natural generalization of the Dirac monopole, since the theory is not symmetric under duality transformations. It is shown that the duality symmetry can be restored by generalizing the electromagnetic field strength to an element of a Clifford algebra. Nevertheless, the generalized framework does not permit us to recover the phenomenological (or conventional) absence of magnetic monopoles.

  15. Electron shell and the alpha-decay

    E-Print Network [OSTI]

    Sergey Yu. Igashov; Yury M. Tchuvil'sky

    2012-12-03T23:59:59.000Z

    The ratio of the alpha-decay widths of a bare nucleus and the related atom is calculated. Both the change of the form and thus the penetrability of the potential barrier and the effect of reflection in the classically-allowed region appearing due to the electron shell are taken into account in the calculations of this ratio. The contribution of each of these two effects is of one and the same order of magnitude. For long-lived radioactive samples the values of the total effect turn out to be somewhat below 1 percent.

  16. Shell India Pvt Ltd | 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 on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia:FAQ < RAPID Jump to:Seadov Pty Ltd Jump to: navigation,Pvt Ltd Jump to: navigation, search Name: Shell India

  17. Single-Shell Tank Evaluations - Hanford Site

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

    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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas ConchasPassiveSubmitted forHighlightsSeminarsSilicon spongeComputingCell AnalysisSingle-Shell

  18. Barr and Showman: Heat Transfer in Europa's Icy Shell 405 Heat Transfer in Europa's Icy Shell

    E-Print Network [OSTI]

    Europa's ice shell controls the thermal evolution of its interior and provides a source of energy surface features with steady-state thermal convection is challeng- ing, even with tidal heating, because convects, can the ocean be thermodynamically stable? What role might compositional heterogeneity play

  19. Rigorous HDD Emissions Capabilities of Shell GTL Fuel

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

    3 Fuel Description - Reference Fuel Reference ULSD (S15) ex Shell Martinez CA Refinery, exhibits < 2 ppm sulfur 43 cetane number (contains no cetane improver) <10%m...

  20. Casimir energy for spherical shell in Schwarzchild black hole background

    E-Print Network [OSTI]

    M. R. Setare; M. B. Altaie

    2003-08-28T23:59:59.000Z

    In this paper, we consider the Casimir energy of massless scalar field which satisfy Dirichlet boundary condition on a spherical shell. Outside the shell, the spacetime is assumed to be described by the Schwarzschild metric, while inside the shell it is taken to be the flat Minkowski space. Using zeta function regularization and heat kernel coefficients we isolate the divergent contributions of the Casimir energy inside and outside the shell, then using the renormalization procedure of the bag model the divergent parts are cancelled, finally obtaining a renormalized expression for the total Casimir energy.

  1. Absence of Embedded Mass Shells: Cerenkov Radiation and Quantum Friction

    E-Print Network [OSTI]

    W. De Roeck; J. Froehlich; A. Pizzo

    2010-01-05T23:59:59.000Z

    We show that, in a model where a non-relativistic particle is coupled to a quantized relativistic scalar Bose field, the embedded mass shell of the particle dissolves in the continuum when the interaction is turned on, provided the coupling constant is sufficiently small. More precisely, under the assumption that the fiber eigenvectors corresponding to the putative mass shell are differentiable as functions of the total momentum of the system, we show that a mass shell could exist only at a strictly positive distance from the unperturbed embedded mass shell near the boundary of the energy-momentum spectrum.

  2. Global geometry of space-time with the charged shell

    E-Print Network [OSTI]

    V. A. Berezin; V. I. Dokuchaev

    2014-04-10T23:59:59.000Z

    It is elaborated the complete classification of the possible types of the spherically symmetric global geometries for two types of electrically charged shells: (1) The charged shell as a single source of the gravitational field, when internal space-time is flat, and external space-time is the Reissner--Nordstr\\"om metric; (2) The neutralizing shell with an electric charge opposite to the charge of the internal source with the Reissner--Nordstr\\"om metric and with the Schwarzschild metric outside the shell.

  3. Mechanical Stability of Cylindrical Thin-Shell Wormholes

    E-Print Network [OSTI]

    M. Sharif; M. Azam

    2013-08-07T23:59:59.000Z

    In this paper, we apply the cut and paste procedure to charged black string for the construction of thin-shell wormhole. We consider the Darmois-Israel formalism to determine the surface stresses of the shell. We take Chaplygin gas to deal with the matter distribution on shell. The radial perturbation approach (preserving the symmetry) is used to investigate the stability of static solutions. We conclude that stable static solutions exist both for uncharged and charged black string thin-shell wormholes for particular values of the parameters.

  4. Off-shell tachyon amplitudes analyticity and projective invariance

    E-Print Network [OSTI]

    Cuomo, F; Nicodemi, F; Pettorino, R; Pezzella, F; Sabella, G

    2001-01-01T23:59:59.000Z

    We compute off-shell three- and four-tachyon amplitudes at tree level by using a prescription based on the requirement of projective invariance. In particular we show that the off-shell four-tachyon amplitude can be put in the same form as the corresponding on-shell one, exhibiting therefore the same analyticity properties. This is shown both for the bosonic and the fermionic string. The result obtained in the latter case can be extended to the off-shell four-tachyon amplitude in type 0 theory.

  5. Off-shell tachyon amplitudes: analyticity and projective invariance

    E-Print Network [OSTI]

    F. Cuomo; R. Marotta; F. Nicodemi; R. Pettorino; F. Pezzella; G. Sabella

    2000-11-09T23:59:59.000Z

    We compute off-shell three- and four-tachyon amplitudes at tree level by using a prescription based on the requirement of projective invariance. In particular we show that the off-shell four-tachyon amplitude can be put in the same form as the corresponding on-shell one, exhibiting therefore the same analyticity properties. This is shown both for the bosonic and the fermionic string. The result obtained in the latter case can be extended to the off-shell four-tachyon amplitude in type 0 theory.

  6. Preserved macroscopic polymeric sheets of shell-binding protein in the Middle Miocene (8 to 18 Ma) gastropod Ecphora

    E-Print Network [OSTI]

    Fogel, Marilyn L

    2015-01-01T23:59:59.000Z

    105-119. Jope, M. (1967) The protein of brachiopod shell-II.Shell protein from fossil articulates: Amino acidD. (2008) Molluscan shell proteins: Primary structure,

  7. NuT

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

    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:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the Contributions andDataNationalNewportBigNovemberNovemberNovemberNovember716,Members

  8. Buckling-induced encapsulation of structured elastic shells under pressure

    E-Print Network [OSTI]

    Reis, Pedro Miguel

    functional origami-like structures at the nano- and microscales (1­3), including encapsulation using hollow for dynamic actuation using a swelling-induced elastic instability (16). There are a few existing hollow shell example of a hollow shell structure satisfying geometric compatibility for gating holes. It enables

  9. Shell Crossing Singularities in Quasi-Spherical Szekeres Models

    E-Print Network [OSTI]

    Subenoy Chakraborty; Ujjal Debnath

    2007-12-16T23:59:59.000Z

    We investigate the occurrence of shell crossing singularities in quasi-spherical Szekeres dust models with or without a cosmological constant. We study the conditions for shell crossing singularity both from physical and geometrical point of view and they are in agreement.

  10. Electrostatic self-energy of a partially formed spherical shell in salt solution: application to stability of tethered and fluid shells -- viruses and vesicles

    E-Print Network [OSTI]

    Anze Losdorfer Bozic; Antonio Siber; Rudolf Podgornik

    2011-04-24T23:59:59.000Z

    We investigate the electrostatics of a partially formed, charged spherical shell in a salt solution. We solve the problem numerically at the Poisson-Boltzmann level and analytically in the Debye-Huckel regime. From the results on energetics of partially formed shells we examine the stability of tethered (crystalline) and fluid shells towards rupture. We clearly delineate different regimes of stability towards rupture, where, for fluid shells, we also include the effects of bending elasticity of the shells. Our analysis shows how charging of the shell induces its instability towards rupture but also provides insight regarding growth of charged shells.

  11. Application to Export Electric Energy OE Doc No. EA-339-A Shell...

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

    Canada. EA-339-A Shell Energy (CN).pdf More Documents & Publications EA-339-A Shell Energy North America (US), L.P. EA-339 Shell Energy North America (US), L.P. EA-359-B Castleton...

  12. On-wafer monolithic encapsulation by surface micromachining with porous polysilicon shell

    E-Print Network [OSTI]

    Kim, Chang-Jin C-J; He, Rihui

    2007-01-01T23:59:59.000Z

    With Porous Polysilicon Shell Rihui He and Chang-Jin C. -of a nanoporous polysilicon shell, creation of a cavity bythrough the pores in the shell, and sealing the cavity at a

  13. Core-Shell Nanopillar Array Solar Cells using Cadmium Sulfide Coating on Indium Phosphide Nanopillars

    E-Print Network [OSTI]

    Tu, Bor-An Clayton

    2013-01-01T23:59:59.000Z

    Yang, Solution-processed core-shell nanowires for efficientYong, Fabrication of ZnO/CdS core/shell nanowire arrays fornew fabrication method for core-shell nanopillar array solar

  14. Evolution of shell loss in Opisthobranch gastropods: sea hares (Opisthobranchia, Anaspidea) as a model system

    E-Print Network [OSTI]

    Vue, Zer

    2009-01-01T23:59:59.000Z

    Zhang, Matrix Proteins in Outer Shells of Molluscs. MarineF. and G. Luquet, Molluscan Shell Proteins. Comptes Rendusbuilds and patterns a sea shell. BMC Biol, 2006. 4: p. 40.

  15. Method to produce large, uniform hollow spherical shells

    DOE Patents [OSTI]

    Hendricks, C.D.

    1983-09-26T23:59:59.000Z

    The invention is a method to produce large uniform hollow spherical shells by (1) forming uniform size drops of heat decomposable or vaporizable material, (2) evaporating the drops to form dried particles, (3) coating the dried particles with a layer of shell forming material and (4) heating the composite particles to melt the outer layer and to decompose or vaporize the inner particle to form an expanding inner gas bubble. The expanding gas bubble forms the molten outer layer into a shell of relatively large diameter. By cycling the temperature and pressure on the molten shell, nonuniformities in wall thickness can be reduced. The method of the invention is utilized to produce large uniform spherical shells, in the millimeter to centimeter diameter size range, from a variety of materials and of high quality, including sphericity, concentricity and surface smoothness, for use as laser fusion or other inertial confinement fusion targets as well as other applications.

  16. Process to make core-shell structured nanoparticles

    DOE Patents [OSTI]

    Luhrs, Claudia; Phillips, Jonathan; Richard, Monique N

    2014-01-07T23:59:59.000Z

    Disclosed is a process for making a composite material that contains core-shell structured nanoparticles. The process includes providing a precursor in the form of a powder a liquid and/or a vapor of a liquid that contains a core material and a shell material, and suspending the precursor in an aerosol gas to produce an aerosol containing the precursor. In addition, the process includes providing a plasma that has a hot zone and passing the aerosol through the hot zone of the plasma. As the aerosol passes through the hot zone of the plasma, at least part of the core material and at least part of the shell material in the aerosol is vaporized. Vapor that contains the core material and the shell material that has been vaporized is removed from the hot zone of the plasma and allowed to condense into core-shell structured nanoparticles.

  17. HI shells in the Leiden/Argentina/Bonn HI survey

    E-Print Network [OSTI]

    Ehlerova, S

    2013-01-01T23:59:59.000Z

    We analyse the all-sky Leiden/Argentina/Bonn HI survey, where we identify shells belonging to the Milky Way. We used an identification method based on the search of continuous regions of a low brightness temperature that are compatible with given properties of HI shells. We found 333 shells in the whole Galaxy. The size distribution of shells in the outer Galaxy is fitted by a power law with the coefficient of 2.6 corresponding to the index 1.8 in the distribution of energy sources. Their surface density decreases exponentially with a scale length of 2.8 kpc. The surface density of shells with radii >= 100 pc in the solar neighbourhood is around 4 per kpc^2 and the 2D porosity is approximately 0.7.

  18. Taming the off-shell Higgs boson

    E-Print Network [OSTI]

    Aleksandr Azatov; Christophe Grojean; Ayan Paul; Ennio Salvioni

    2015-03-10T23:59:59.000Z

    We study the off-shell Higgs data in the process $pp\\to h^{(*)} \\to Z^{(\\ast)}Z^{(\\ast)}\\to 4\\ell$, to constrain deviations of the Higgs couplings. We point out that this channel can be used to resolve the long- and short-distance contributions to Higgs production by gluon fusion and can thus be complementary to $pp\\to ht\\bar t$ in measuring the top Yukawa coupling. Our analysis, performed in the context of Effective Field Theory, shows that current data do not allow one to draw any model-independent conclusions. We study the prospects at future hadron colliders, including the high-luminosity LHC and accelerators with higher-energy, up to 100 TeV. The available QCD calculations and the theoretical uncertainties affecting our analysis are also briefly discussed.

  19. Double Shell Tank (DST) Utilities Specification

    SciTech Connect (OSTI)

    SUSIENE, W.T.

    2000-04-27T23:59:59.000Z

    This specification establishes the performance requirements and provides the references to the requisite codes and standards to he applied during the design of the Double-Shell Tank (DST) Utilities Subsystems that support the first phase of waste feed delivery (WFD). The DST Utilities Subsystems provide electrical power, raw/potable water, and service/instrument air to the equipment and structures used to transfer low-activity waste (LAW) and high-level waste (HLW) to designated DST staging tanks. The DST Utilities Subsystems also support the equipment and structures used to deliver blended LAW and HLW feed from these staging tanks to the River Protection Project (RPP) Privatization Contractor facility where the waste will be immobilized. This specification is intended to be the basis for new projects/installations. This specification is not intended to retroactively affect previously established project design criteria without specific direction by the program.

  20. Nuclear energy density optimization: Shell structure

    E-Print Network [OSTI]

    M. Kortelainen; J. McDonnell; W. Nazarewicz; E. Olsen; P. -G. Reinhard; J. Sarich; N. Schunck; S. M. Wild; D. Davesne; J. Erler; A. Pastore

    2014-04-28T23:59:59.000Z

    Nuclear density functional theory is the only microscopical theory that can be applied throughout the entire nuclear landscape. Its key ingredient is the energy density functional. In this work, we propose a new parameterization UNEDF2 of the Skyrme energy density functional. The functional optimization is carried out using the POUNDerS optimization algorithm within the framework of the Skyrme Hartree-Fock-Bogoliubov theory. Compared to the previous parameterization UNEDF1, restrictions on the tensor term of the energy density have been lifted, yielding a very general form of the energy density functional up to second order in derivatives of the one-body density matrix. In order to impose constraints on all the parameters of the functional, selected data on single-particle splittings in spherical doubly-magic nuclei have been included into the experimental dataset. The agreement with both bulk and spectroscopic nuclear properties achieved by the resulting UNEDF2 parameterization is comparable with UNEDF1. While there is a small improvement on single-particle spectra and binding energies of closed shell nuclei, the reproduction of fission barriers and fission isomer excitation energies has degraded. As compared to previous UNEDF parameterizations, the parameter confidence interval for UNEDF2 is narrower. In particular, our results overlap well with those obtained in previous systematic studies of the spin-orbit and tensor terms. UNEDF2 can be viewed as an all-around Skyrme EDF that performs reasonably well for both global nuclear properties and shell structure. However, after adding new data aiming to better constrain the nuclear functional, its quality has improved only marginally. These results suggest that the standard Skyrme energy density has reached its limits and significant changes to the form of the functional are needed.

  1. U-157: Ruby Mail Gem Directory Traversal and Shell Command Injection...

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

    57: Ruby Mail Gem Directory Traversal and Shell Command Injection Vulnerabilities U-157: Ruby Mail Gem Directory Traversal and Shell Command Injection Vulnerabilities April 27,...

  2. E-Print Network 3.0 - adaptive shell color Sample Search Results

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

    firework shells exploded onto usually dark screens in a variety of colors artillery guns were used to fire... Development Award (0092784) 2 Overview shells ... Source:...

  3. Tachyon condensation and off-shell gravity/gauge duality

    E-Print Network [OSTI]

    Yun Soo Myung

    2006-11-06T23:59:59.000Z

    We investigate quasilocal tachyon condensation by using gravity/gauge duality. In order to cure the IR divergence due to a tachyon, we introduce two regularization schemes: AdS space and a d=10 Schwarzschild black hole in a cavity. These provide stable canonical ensembles and thus are good candidates for the endpoint of tachyon condensation. Introducing the Cardy-Verlinde formula, we establish the on-shell gravity/gauge duality. We propose that the stringy geometry resulting from the off-shell tachyon dynamics matches onto the off-shell AdS black hole, where "off-shell" means non-equilibrium configuration. The instability induced by condensation of a tachyon behaves like an off-shell black hole and evolves toward a large stable black hole. The off-shell free energy and its derivative ($\\beta$-function) are used to show the off-shell gravity/gauge duality for the process of tachyon condensation. Further, d=10 Schwarzschild black hole in a cavity is considered for the Hagedorn transition as a possible explanation of the tachyon condensation.

  4. Local Casimir Energies for a Thin Spherical Shell

    E-Print Network [OSTI]

    Ines Cavero-Pelaez; Kimball A. Milton; Jeffrey Wagner

    2006-02-01T23:59:59.000Z

    The local Casimir energy density for a massless scalar field associated with step-function potentials in a 3+1 dimensional spherical geometry is considered. The potential is chosen to be zero except in a shell of thickness $\\delta$, where it has height $h$, with the constraint $h\\delta=1$. In the limit of zero thickness, an ideal $\\delta$-function shell is recovered. The behavior of the energy density as the surface of the shell is approached is studied in both the strong and weak coupling regimes. The former case corresponds to the well-known Dirichlet shell limit. New results, which shed light on the nature of surface divergences and on the energy contained within the shell, are obtained in the weak coupling limit, and for a shell of finite thickness. In the case of zero thickness, the energy has a contribution not only from the local energy density, but from an energy term residing entirely on the surface. It is shown that the latter coincides with the integrated local energy density within the shell. We also study the dependence of local and global quantities on the conformal parameter. In particular new insight is provided on the reason for the divergence in the global Casimir energy in third order in the coupling.

  5. The fragmentation of expanding shells II: Thickness matters

    E-Print Network [OSTI]

    Wunsch, Richard; Palous, Jan; Whitworth, Anthony P

    2010-01-01T23:59:59.000Z

    We study analytically the development of gravitational instability in an expanding shell having finite thickness. We consider three models for the radial density profile of the shell: (i) an analytic uniform-density model, (ii) a semi-analytic model obtained by numerical solution of the hydrostatic equilibrium equation, and (iii) a 3D hydrodynamic simulation. We show that all three profiles are in close agreement, and this allows us to use the first model to describe fragments in the radial direction of the shell. We then use non-linear equations describing the time-evolution of a uniform oblate spheroid to derive the growth rates of shell fragments having different sizes. This yields a dispersion relation which depends on the shell thickness, and hence on the pressure confining the shell. We compare this dispersion relation with the dispersion relation obtained using the standard thin-shell analysis, and show that, if the confining pressure is low, only large fragments are unstable. On the other hand, if the...

  6. Gamow shell model and realistic nucleon-nucleon interactions

    E-Print Network [OSTI]

    G. Hagen; M. Hjorth-Jensen; N. Michel

    2006-05-27T23:59:59.000Z

    We present a new and efficient method to obtain a Gamow shell-model basis and matrix elements generated by realistic nucleon-nucleon interactions. We derive a self-consistent Hartree-Fock potential from the renormalized N3LO interaction model. The corresponding Gamow one-body eigenstates are generated in a plane wave basis in order to build a Gamow shell-model set of basis states for the closed shell nuclei 4He and 16O. We address also the problem of representing a realistic nucleon-nucleon interaction in a two-particle Berggren basis in the laboratory frame. To achieve this, an expansion of matrix elements of the residual nucleon-nucleon interaction in a finite set of harmonic oscillator wave functions is used. We show that all loosely bound and narrow resonant states converge surprisingly fast. Even broad resonances in these two-particle valence systems converge within a reasonable number of harmonic oscillator functions. Examples of 6He and 18O Gamow shell-model calculations using 4He and 16}O as closed shell cores are presented. This procedure allows Gamow shell-model calculations to be performed with all realistic nucleon-nucleon interactions and with either momentum or position space representations for the Gamow basis. The possibility to remove the center of mass spuriosity of Gamow shell-model nuclear states with this method is also discussed. Perspectives for nuclear structure calculations of dripline nuclei are outlined.

  7. Spherical cloaking using multilayer shells of ordinary dielectrics

    SciTech Connect (OSTI)

    Wang, Xiaohui; Chen, Fang; Semouchkina, Elena, E-mail: esemouch@mtu.edu [Department of Electrical and Computer Engineering, Michigan Technological University, Houghton, MI, 49931 (United States)] [Department of Electrical and Computer Engineering, Michigan Technological University, Houghton, MI, 49931 (United States)

    2013-11-15T23:59:59.000Z

    An approach for spherical cloaking using multilayer ordinary dielectric materials has been developed. The total scattering cross section (TSCS) of the spherical multilayer shell with metallic core was derived based on the Mie theory. The dielectric profile of the shell was optimized to minimize the TSCS of the cloaked target. The specific directions, at which the scattering could be practically eliminated, were detected. The influence of the target size and the dielectric material loss on the cloaking efficiency was analyzed. It was shown that the cloaking efficiency for larger targets could be improved by employing lossy materials in the shell.

  8. On the vacuum energy of a spherical plasma shell

    E-Print Network [OSTI]

    M. Bordag; N. Khusnutdinov

    2008-01-14T23:59:59.000Z

    We consider the vacuum energy of the electromagnetic field interacting with a spherical plasma shell together with a model for the classical motion of the shell. We calculate the heat kernel coefficients, especially that for the TM mode, and carry out the renormalization by redefining the parameters of the classical model. It turns out that this is possible and results in a model, which in the limit of the plasma shell becoming an ideal conductor reproduces the vacuum energy found by Boyer in 1968.

  9. Direct mapping of nuclear shell effects in the heaviest elements

    E-Print Network [OSTI]

    E. Minaya Ramirez; D. Ackermann; K. Blaum; M. Block; C. Droese; Ch. E. Dllmann; M. Dworschak; M. Eibach; S. Eliseev; E. Haettner; F. Herfurth; F. P. Heberger; S. Hofmann; J. Ketelaer; G. Marx; M. Mazzocco; D. Nesterenko; Yu. N. Novikov; W. R. Pla; D. Rodrguez; C. Scheidenberger; L. Schweikhard; P. G. Thirolf; C. Weber

    2014-06-25T23:59:59.000Z

    Quantum-mechanical shell effects are expected to strongly enhance nuclear binding on an "island of stability" of superheavy elements. The predicted center at proton number $Z=114,120$, or $126$ and neutron number $N=184$ has been substantiated by the recent synthesis of new elements up to $Z=118$. However the location of the center and the extension of the island of stability remain vague. High-precision mass spectrometry allows the direct measurement of nuclear binding energies and thus the determination of the strength of shell effects. Here, we present such measurements for nobelium and lawrencium isotopes, which also pin down the deformed shell gap at $N=152$.

  10. Energy transfers in shell models for MHD turbulence

    E-Print Network [OSTI]

    T. Lessinnes; M. K. Verma; D. Carati

    2008-07-31T23:59:59.000Z

    A systematic procedure to derive shell models for MHD turbulence is proposed. It takes into account the conservation of ideal quadratic invariants such as the total energy, the cross-helicity and the magnetic helicity as well as the conservation of the magnetic energy by the advection term in the induction equation. This approach also leads to simple expressions for the energy exchanges as well as to unambiguous definitions for the energy fluxes. When applied to the existing shell models with nonlinear interactions limited to the nearest neighbour shells, this procedure reproduces well known models but suggests a reinterpretation of the energy fluxes.

  11. Spurious Shell Closures in the Relativistic Mean Field Model

    E-Print Network [OSTI]

    L. S. Geng; J. Meng; H. Toki; W. H. Long; G. Shen

    2006-03-10T23:59:59.000Z

    Following a systematic theoretical study of the ground-state properties of over 7000 nuclei from the proton drip line to the neutron drip line in the relativistic mean field model [Prog. Theor. Phys. 113 (2005) 785], which is in fair agreement with existing experimental data, we observe a few spurious shell closures, i.e. proton shell closures at Z=58 and Z=92. These spurious shell closures are found to persist in all the effective forces of the relativistic mean field model, e.g. TMA, NL3, PKDD and DD-ME2.

  12. Thin-shell wormholes from regular charged black holes

    E-Print Network [OSTI]

    F. Rahaman; K A Rahman; Sk. A Rakib; Peter K. F. Kuhfittig

    2009-09-06T23:59:59.000Z

    We investigate a new thin-shell wormhole constructed by surgically grafting two regular charged black holes arising from the action using nonlinear electrodynamics coupled to general relativity. The stress-energy components within the shell violate the null and weak energy conditions but obey the strong energy condition. We study the stability in two ways: (i) taking a specific equation of state at the throat and (ii) analyzing the stability to linearized spherically symmetric perturbations about a static equilibrium solution. Various other aspects of this thin-shell wormhole are also analyzed.

  13. Stability of Thin-Shell Wormholes in Nonlinear Electrodynamics

    E-Print Network [OSTI]

    M. Sharif; M. Azam

    2013-06-17T23:59:59.000Z

    In this paper, we construct thin-shell wormholes by applying the cut and paste procedure to a regular charged black hole in nonlinear electrodynamics field. We discuss different physical aspects of wormholes such as, the possible equation of state to matter shell, attractive or repulsive nature of wormhole and total amount of exotic matter required. The thin-shell equation of motion with and without cosmological constant is also investigated under linearized perturbation. Finally, we explore the stability regions interpreted by the parameter $\\beta$ (speed of sound) and conclude that there are realistic stability regions for some fixed values of parameters.

  14. ARIES-IV Nested Shell Blanket Design

    SciTech Connect (OSTI)

    Wong, C.P.C.; Redler, K.; Reis, E.E.; Will, R. [General Atomics, San Diego, CA (United States); Cheng, E. [TSI Research, Inc. (United States); Hasan, C.M.; Sharafat, S. [California Univ., Los Angeles, CA (United States)

    1993-11-01T23:59:59.000Z

    The ARIES-IV Nested Shell Blanket (NSB) Design is an alternate blanket concept of the ARIES-IV low activation helium-cooled reactor design. The reference design has the coolant routed in the poloidal direction and the inlet and outlet plena are located at the top and bottom of the torus. The NSB design has the high velocity coolant routed in the toroidal direction and the plena are located behind the blanket. This is of significance since the selected structural material is SiC-composite. The NSB is designed to have key high performance components with characteristic dimensions of no larger than 2 m. These components can be brazed to form the blanket module. For the diverter design, we eliminated the use of W as the divertor coating material by relying on the successful development of the gaseous divertor concept. The neutronics and thermal-hydraulic performance of both blanket concepts are similar. The selected blanket and divertor configurations can also meet all the projected structural, neutronics and thermal-hydraulics design limits and requirements. With the selected blanket and divertor materials, the design has a level of safety assurance rate of I (LSA-1), which indicates an inherently safe design.

  15. Energy conditions, traversable wormholes and dust shells

    E-Print Network [OSTI]

    Francisco S. N. Lobo

    2004-10-18T23:59:59.000Z

    Firstly, we review the pointwise and averaged energy conditions, the quantum inequality and the notion of the ``volume integral quantifier'', which provides a measure of the ``total amount'' of energy condition violating matter. Secondly, we present a specific metric of a spherically symmetric traversable wormhole in the presence of a generic cosmological constant, verifying that the null and the averaged null energy conditions are violated, as was to be expected. Thirdly, a pressureless dust shell is constructed around the interior wormhole spacetime by matching the latter geometry to a unique vacuum exterior solution. In order to further minimize the usage of exotic matter, we then find regions where the surface energy density is positive, thereby satisfying all of the energy conditions at the junction surface. An equation governing the behavior of the radial pressure across the junction surface is also deduced. Lastly, taking advantage of the construction, specific dimensions of the wormhole, namely, the throat radius and the junction interface radius, and estimates of the total traversal time and maximum velocity of an observer journeying through the wormhole, are also found by imposing the traversability conditions.

  16. K-Shell Photoabsorption of Magnesium Ions

    E-Print Network [OSTI]

    Hasoglu, M F; Gorczyca, T W

    2013-01-01T23:59:59.000Z

    X-ray photoabsorption cross sections have been computed for all magnesium ions using the R-matrix method. A comparison with the other available data for Mg II- Mg X shows good qualitative agreement in general. However, for the lower ionization stages, and for singly-ionized Mg II in particular, the previous R-matrix results (Witthoeft et al. 2009; Witthoeft et al. 2011) overestimate the K-edge position due to the absence of important orbital relaxation effects in those earlier calculations, and a global shift downward in photon energy of those cross sections is therefore warranted. The resultant resonance shapes are found to be quite similar between the two R-matrix results, on the other hand. The cross sections for Mg I and Mg II are further complicated by the M-shell (n=3) occupancy. As a result, the treatment of spectator Auger decay of 1s-> np resonances using the multichannel quantum defect, optical potential method becomes problematic, and it was necessary to implement an alternative, approximate treatm...

  17. Shell Solar GmbH formerly Siemens und Shell Solar GmbH | Open Energy

    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 on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia:FAQ < RAPID Jump to:Seadov Pty Ltd Jump to: navigation,Pvt Ltd Jump to: navigation, search Name: Shell

  18. Double Shell Tank (DST) Monitor and Control Subsystem Specification

    SciTech Connect (OSTI)

    BAFUS, R.R.

    2000-11-03T23:59:59.000Z

    This specification revises the performance requirements and provides references to the requisite codes and standards to be applied during design of the Double-Shell Tank (DST) Monitor and Control Subsystem that supports the first phase of Waste Feed Delivery.

  19. Double Shell Tank (DST) Process Waste Sampling Subsystem Specification

    SciTech Connect (OSTI)

    RASMUSSEN, J.H.

    2000-05-03T23:59:59.000Z

    This specification establishes the performance requirements and provides references to the requisite codes and standards to be applied to the Double-Shell Tank (DST) Process Waste Sampling Subsystem which supports the first phase of Waste Feed Delivery.

  20. Scattering of infrared light by dielectric core-shell particles

    E-Print Network [OSTI]

    Thiessen, E; Heinisch, R L; Fehske, H

    2015-01-01T23:59:59.000Z

    We study the scattering of infrared light by small dielectric core-shell particles taking a sapphire sphere with a CaO core as an example. The extinction efficiency of such a particle shows two intense series of resonances attached, respectively, to in-phase and out-of-phase multipolar polarization-induced surface charges build-up, respectively, at the core-shell and the shell-vacuum interface. Both series, the character of the former may be labelled bonding and the character of the latter antibonding, give rise to anomalous scattering. For a given particle radius and filling factor the Poynting vector field shows therefore around two wave numbers the complex topology of this type of light scattering. Inside the particle the topology depends on the character of the resonance. The dissipation of energy inside the particle also reflects the core-shell structure. It depends on the resonance and shows strong spatial variations.

  1. Off-shell helicity amplitudes in high-energy factorization

    E-Print Network [OSTI]

    Piotr Kotko

    2013-09-20T23:59:59.000Z

    In the Catani-Ciafaloni-Hautmann high-energy factorization approach a cross section is expressed as a convolution of unintegrated gluon densities and a gauge-invariant hard process, in which two incoming gluons are off-shell with momenta satisfying certain high-energy kinematics. We present two methods of evaluating the tree-level hard process with multiple final states. The first one assumes that only one of the gluons is off-shell and relies on the Slavnov-Taylor identities. Such asymmetric configuration of incoming gluons is phenomenologically important in small x probing by forward processes. The second method deals also with two off-shell gluons and is based on the analytic continuation of the off-shell gluons momenta to the complex space. The methods were implemented into Monte Carlo computer programs and used in phenomenological applications. The results of both methods are straightforwardly related to Lipatov's effective vertices in quasi-multi-regge kinematics.

  2. Buckling of circular steel cylindrical shells under different loading conditions

    E-Print Network [OSTI]

    Chen, Lei

    2011-06-28T23:59:59.000Z

    Cylindrical shells are widely used in civil engineering. Examples include cooling towers, pipelines, nuclear containment vessels, steel silos and tanks for storage of bulk solids and liquids, and pressure vessels. The ...

  3. Effective {beta}{beta}-Decay Operator for the Shell Model

    SciTech Connect (OSTI)

    Engel, J. [Dept. of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599-3255 (United States)

    2011-12-16T23:59:59.000Z

    Work towards the development of an effective shell-model neutrinoless-decay operator that accounts for states omitted from the model space in the same way the effective interaction does is discussed.

  4. String Gas Shells, their Dual Radiation and Hedgehog Signature Control

    E-Print Network [OSTI]

    E. I. Guendelman

    2009-03-12T23:59:59.000Z

    We search for spherically symmetric, stationary solutions with a string gas shell as a source. The requirement of a uniform newtonian potential, or constancy of the 00 component of the metric, implies the existence of a "dual" radiation, which we argue can be interpreted as representing the virtual quantum fluctuations that stabilize the shell. A string hedgehog can be introduced also into the solution. For zero or small hedgehog strength the string gas shell is of a regular nature, while the dual radiation is of a spacelike nature. For higher hedgehog strengths however the radiation "materializes" and becomes timelike while the string gas shell becomes space like. The significance of these solutions for the quantum theory is discussed.

  5. Dust-shell Universe in the modified gravity scenario

    E-Print Network [OSTI]

    Michael Maziashvili

    2005-04-15T23:59:59.000Z

    The dynamics of the dust-shell model of universe is exactly solved for the modified Schwarzschild solution. This solution is used to derive the cosmology corresponding to the modified gravity.

  6. Effects of various inefficiencies in rowing on shell speed

    E-Print Network [OSTI]

    Young, Stephen F., Jr

    2009-01-01T23:59:59.000Z

    First order predictions were made in determining the effects of various sources of inefficiency in rowing on shell speed. These predictions were then tested using a MATLAB model of the rowing stroke. The model simulates ...

  7. THE CONSEQUENCES OF SELECTION FOR SHELL QUALITY IN POULTRY (1)

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    THE CONSEQUENCES OF SELECTION FOR SHELL QUALITY IN POULTRY (1) W. F. van TIJEN Institute for Poultry Research rc Het Spelderholt u, Beekbergen, The Netherlands SUMMARY In two strains, one of W

  8. Cylindrical thin-shell wormholes and energy conditions

    E-Print Network [OSTI]

    Claudio Simeone

    2012-03-16T23:59:59.000Z

    We prove the impossibility of cylindrical thin-shell wormholes supported by matter satisfying the energy conditions everywhere, under reasonable assumptions about the asymptotic behaviour of the - in general different - metrics at each side of the throat. In particular, we reproduce for singular sources previous results corresponding to flat and conical asymptotics, and extend them to a more general asymptotic behaviour. Besides, we establish necessary conditions for the possibility of non exotic cylindrical thin-shell wormholes.

  9. Fabrication of precision glass shells by joining glass rods

    DOE Patents [OSTI]

    Gac, Frank D. (Los Alamos, NM); Blake, Rodger D. (Santa Fe, NM); Day, Delbert E. (Rolla, MO); Haggerty, John S. (Lincoln, MA)

    1988-01-01T23:59:59.000Z

    A method for making uniform spherical shells. The present invention allows niform hollow spheres to be made by first making a void in a body of material. The material is heated so that the viscosity is sufficiently low so that the surface tension will transform the void into a bubble. The bubble is allowed to rise in the body until it is spherical. The excess material is removed from around the void to form a spherical shell with a uniform outside diameter.

  10. Off-energy-shell behavior of realistic potential models

    SciTech Connect (OSTI)

    Redish, E.F.; Stricker-Bauer, K.

    1987-08-01T23:59:59.000Z

    The behavior of the fully-off-the-energy-shell T matrices for the Reid-soft-core and Paris-80 potentials are studied for a variety of partial waves, both uncoupled and coupled. Although the potentials have qualitatively different structures in both coordinate space and momentum space, the resulting off-energy-shell behavior is very similar in the range of energy and momentum relevant to low and medium energy nuclear physics.

  11. A linear dynamic analysis of stiffened shells of revolution by the matrix displacement method

    E-Print Network [OSTI]

    Hoover, Charlie Doll

    2012-06-07T23:59:59.000Z

    displacement approach and Houbolt's numerical method of integration. The stiffened shell structure considered here is a combination of shell structure with either meridional or circumferential stiff- eners or both. The structure is idealized... Survey Shell Structures. Stiffened Shell Structures. Objective Scope of Investigation. 1 4 4 8 13 15 II GENERAL DESCRIPTION OF THE MATRIX DISPLACEMENT METHOD. . . . . . . . . . . . . . . . . . . . . 17 Static Analysis Dynamic Analysis. 17...

  12. INNER SHELL EXCITATION OF ATOMS AND MOLECULES BY ELECTRON IMPACT WITH HIGH ENERGY RESOLUTION

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    INNER SHELL EXCITATION OF ATOMS AND MOLECULES BY ELECTRON IMPACT WITH HIGH ENERGY RESOLUTION F. H resolution energy loss spectra for inner shell excited states, (2) the observa- tion of inner shell excited are the subject of the present review. The inner shell states that can usefully be studied with energy resolutions

  13. ON THE DERIVATION OF NONLINEAR SHELL MODELS FROM THREE-DIMENSIONAL ELASTICITY

    E-Print Network [OSTI]

    , 74G10, 74G65. Key words and phrases. Elasticity, shells, energy minimization, Koiter. hal-00392028ON THE DERIVATION OF NONLINEAR SHELL MODELS FROM THREE-DIMENSIONAL ELASTICITY Cristinel Mardare. A nonlinearly elastic shell is modeled either by the nonlinear three- dimensional shell model or by a nonlinear

  14. E-Print Network 3.0 - ark shell scapharca Sample Search Results

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

    Ignacio Alvarez-Hamelin Summary: features: hierarchical relationships, shells interconnectivity or nodes clustering provide global... ; ...

  15. Coulomb energy of uniformly-charged spheroidal shell systems

    E-Print Network [OSTI]

    Vikram Jadhao; Zhenwei Yao; Creighton K. Thomas; Monica Olvera de la Cruz

    2015-01-15T23:59:59.000Z

    We provide exact expressions for the electrostatic energy of uniformly-charged prolate and oblate spheroidal shells. We find that uniformly-charged prolate spheroids of eccentricity greater than 0.9 have lower Coulomb energy than a sphere of the same area. For the volume-constrained case, we find that a sphere has the highest Coulomb energy among all spheroidal shells. Further, we derive the change in the Coulomb energy of a uniformly-charged shell due to small, area-conserving perturbations on the spherical shape. Our perturbation calculations show that buckling-type deformations on a sphere can lower the Coulomb energy. Finally, we consider the possibility of counterion condensation on the spheroidal shell surface. We employ a Manning-Oosawa two-state model approximation to evaluate the renormalized charge and analyze the behavior of the equilibrium free energy as a function of the shell's aspect ratio for both area-constrained and volume-constrained cases. Counterion condensation is seen to favor the formation of spheroidal structures over a sphere of equal area for high values of shell volume fractions.

  16. Model space truncation in shell-model fits

    E-Print Network [OSTI]

    G. F. Bertsch; C. W. Johnson

    2009-07-07T23:59:59.000Z

    We carry out an interacting shell-model study of binding energies and spectra in the $sd$-shell nuclei to examine the effect of truncation of the shell-model spaces. Starting with a Hamiltonian defined in a larger space and truncating to the $sd$ shell, the binding energies are strongly affected by the truncation, but the effect on the excitation energies is an order of magnitude smaller. We then refit the matrix elements of the two-particle interaction to compensate for the space truncation, and find that it is easy to capture 90% of the binding energy shifts by refitting a few parameters. With the full parameter space of the two-particle Hamiltonian, we find that both the binding energies and the excitation energy can be fitted with remaining residual error about 5% of the average error from the truncation. Numerically, the rms initial error associated with our Hamiltonian is 3.4 MeV and the remaining residual error is 0.16 MeV. This is comparable to the empirical error found in $sd$-shell interacting shell model fits to experimental data\\cite{br06}.

  17. Off-Shell Higgs Coupling Measurements in BSM scenarios

    E-Print Network [OSTI]

    Christoph Englert; Yotam Soreq; Michael Spannowsky

    2014-10-20T23:59:59.000Z

    Proposals of measuring the off-shell Higgs contributions and first measurements at the LHC have electrified the Higgs phenomenology community for two reasons: Firstly, probing interactions at high invariant masses and momentum transfers is intrinsically sensitive to new physics beyond the Standard Model, irrespective of a resonant or non-resonant character of a particular BSM scenario. Secondly, under specific assumptions a class of models exists for which the off-shell coupling measurement together with a measurement of the on-shell signal strength can be re-interpreted in terms of a bound on the total Higgs boson width. In this paper, we provide a first step towards a classification of the models for which a total width measurement is viable and we discuss examples of BSM models for which the off-shell coupling measurement can be important in either constraining or even discovering new physics in the upcoming LHC runs. Specifically, we discuss the quantitative impact of the presence of dimension six operators on the (de)correlation of Higgs on- and off-shell regions keeping track of all interference effects. We furthermore investigate off-shell measurements in a wider context of new (non-)resonant physics in Higgs portal scenarios and the MSSM.

  18. Generalized seniority with realistic interactions in open-shell nuclei

    E-Print Network [OSTI]

    M. A. Caprio; F. Q. Luo; K. Cai; Ch. Constantinou; V. Hellemans

    2014-08-30T23:59:59.000Z

    Generalized seniority provides a truncation scheme for the nuclear shell model, based on pairing correlations, which offers the possibility of dramatically reducing the dimensionality of the nuclear shell-model problem. Systematic comparisons against results obtained in the full shell-model space are required to assess the viability of this scheme. Here, we extend recent generalized seniority calculations for semimagic nuclei, the Ca isotopes, to open-shell nuclei, with both valence protons and valence neutrons. The even-mass Ti and Cr isotopes are treated in a full major shell and with realistic interactions, in the generalized seniority scheme with one broken proton pair and one broken neutron pair. Results for level energies, orbital occupations, and electromagnetic observables are compared with those obtained in the full shell-model space. We demonstrate that, even for the Ti isotopes, significant benefit would be obtained in going beyond the approximation of one broken pair of each type, while the Cr isotopes require further broken pairs to provide even qualitative accuracy.

  19. A Techno-Economic Assessment of Hydrogen Production by

    E-Print Network [OSTI]

    .0 Resource Assessment of Biomass Feedstocks 1.1 Bagasse, Sw itch Grass, and Nut Shell Availability and Cost 1

  20. Nonzero angular momentum pairing correlation in shell model

    E-Print Network [OSTI]

    S. Haq; Y. Sadeq; I. M. Hamammu

    2008-10-07T23:59:59.000Z

    A simple approximation to shell model is proposed in which the low energy excitation spectra corresponds to the identical nucleons occupying the same single particle states where they preferred to form pairs for the ground states. We call this approximation as nonzero angular momentum pairing shell model. It not only reduces the dimensionality of the shell model but also matches the number of low energy levels in experimental spectra for few cases where exact shell model predicts many more states. The special focus has been done to consider the realistic interaction derived from free nucleon-nucleon scattering data to cope with the experimental spectra. The proposed approximation to shell model has been applied to calculate the energy spectra of O18 and Ni58 nuclei where only two neutrons occupy the valence states outside the core. When compared with the experimental data, the results are found to be encouraging. It is expected that results will be more pronounced if the even-even nuclei with higher number of valence nucleons are considered.

  1. Coulomb energy of uniformly-charged spheroidal shell systems

    E-Print Network [OSTI]

    Jadhao, Vikram; Thomas, Creighton K; de la Cruz, Monica Olvera

    2015-01-01T23:59:59.000Z

    We provide exact expressions for the electrostatic energy of uniformly-charged prolate and oblate spheroidal shells. We find that uniformly-charged prolate spheroids of eccentricity greater than 0.9 have lower Coulomb energy than a sphere of the same area. For the volume-constrained case, we find that a sphere has the highest Coulomb energy among all spheroidal shells. Further, we derive the change in the Coulomb energy of a uniformly-charged shell due to small, area-conserving perturbations on the spherical shape. Our perturbation calculations show that buckling-type deformations on a sphere can lower the Coulomb energy. Finally, we consider the possibility of counterion condensation on the spheroidal shell surface. We employ a Manning-Oosawa two-state model approximation to evaluate the renormalized charge and analyze the behavior of the equilibrium free energy as a function of the shell's aspect ratio for both area-constrained and volume-constrained cases. Counterion condensation is seen to favor the forma...

  2. Shell Model and Mean-Field Description of Band Termination

    E-Print Network [OSTI]

    M. Zalewski; W. Satula; W. Nazarewicz; G. Stoitcheva; H. Zdunczuk

    2007-01-09T23:59:59.000Z

    We study nuclear high-spin states undergoing the transition to the fully stretched configuration with maximum angular momentum I_max within the space of valence nucleons. To this end, we perform a systematic theoretical analysis of non-fully-stretched I_max-2 and I_max-1 f_{7/2}^n seniority isomers and d_{3/2}^{-1} f_{7/2}^{n+1} intruder states in the A~44 nuclei from the lower-fp shell. We employ two theoretical approaches: (i) the density functional theory based on the cranked self-consistent Skyrme-Hartree-Fock method, and (ii) the nuclear shell model in the full sdfp configuration space allowing for 1p-1h cross-shell excitations. We emphasize the importance of restoration of broken angular momentum symmetry inherently obscuring the mean-field treatment of high-spin states. Overall good agreement with experimental data is obtained.

  3. Effective interactions and shell model studies of heavy tin isotopes

    E-Print Network [OSTI]

    M. P. Kartamyshev; T. Engeland; M. Hjorth-Jensen; E. Osnes

    2006-10-05T23:59:59.000Z

    We present results from large-scale shell-model calculations of even and odd tin isotopes from 134Sn to 142}Sn with a shell-model space defined by the 1f7/2,2p3/2,0h9/2,2p1/2,1f5/2,0i13/2 single-particle orbits. An effective two-body interaction based on modern nucleon-nucleon interactions is employed. The shell-model results are in turn analyzed for their pairing content using a generalized seniority approach. Our results indicate that a pairing-model picture captures a great deal of the structure and the correlations of the lowest lying states for even and odd isotopes.

  4. Ge/Si core/multi shell heterostructure FETs

    SciTech Connect (OSTI)

    Picraux, Samuel T [Los Alamos National Laboratory; Dayeh, Shadi A [Los Alamos National Laboratory

    2010-01-01T23:59:59.000Z

    Concentric heterostructured materials provide numerous design opportunities for engineering strain and interfaces, as well as tailoring energy band-edge combinations for optimal device performance. Key to the realization of such novel device concepts is the complete understanding and full control over their growth, crystal structure, and hetero-epitaxy. We report here on a new route for synthesizing Ge/Si core/multi-shell heterostructure nanowires that eliminate Au seed diffusion on the nanowire sidewalls by engineering the interface energy density difference. We show that such control over core/shell synthesis enable experimental realization of heterostructure FET devices beyond those available in the literature with enhanced transport characteristics. We provide a side-by-side comparison on the transport properties of Ge/Si core/multi-shell nanowires grown with and without Au diffusion and demonstrate heterostructure FETs with drive currents that are {approx} 2X higher than record results for p-type FETs.

  5. Antibound States and Halo Formation in the Gamow Shell Model

    E-Print Network [OSTI]

    N. Michel; W. Nazarewicz; M. Ploszajczak; J. Rotureau

    2006-09-07T23:59:59.000Z

    The open quantum system formulation of the nuclear shell model, the so-called Gamow Shell Model (GSM), is a multi-configurational SM that employs a single-particle basis given by the Berggren ensemble consisting of Gamow states and the non-resonant continuum of scattering states. The GSM is of particular importance for weakly bound/unbound nuclear states where both many-body correlations and the coupling to decay channels are essential. In this context, we investigate the role of l=0 antibound (virtual) neutron single-particle states in the shell model description of loosely bound wave functions, such as the ground state wave function of a halo nucleus 11Li.

  6. Nucleus-nucleus potential with shell-correction contribution

    E-Print Network [OSTI]

    V. Yu. Denisov

    2015-02-04T23:59:59.000Z

    The full relaxed-density potential between spherical nuclei is considered as a sum of the macroscopic and shell-correction contributions. The macroscopic part of the potential is related to a nucleus-nucleus potential obtained in the framework of the extended Thomas-Fermi approach with the Skyrme and Coulomb forces and the relaxed-density ansatz for evaluation of proton and neutron densities of interacting nuclei. A simple prescription for the shell-correction part of the total potential is discussed. The parameters of the shell-correction and macroscopic parts of the relaxed-density potential are found by fitting the empirical barrier heights of the 89 nucleus-nucleus systems as well as macroscopic potentials evaluated for 1485 nucleus-nucleus systems at 12 distances around touching points.

  7. Summary compilation of shell element performance versus formulation.

    SciTech Connect (OSTI)

    Heinstein, Martin Wilhelm; Hales, Jason Dean (Idaho National Laboratory, Idaho Falls, ID); Breivik, Nicole L.; Key, Samuel W. (FMA Development, LLC, Great Falls, MT)

    2011-07-01T23:59:59.000Z

    This document compares the finite element shell formulations in the Sierra Solid Mechanics code. These are finite elements either currently in the Sierra simulation codes Presto and Adagio, or expected to be added to them in time. The list of elements are divided into traditional two-dimensional, plane stress shell finite elements, and three-dimensional solid finite elements that contain either modifications or additional terms designed to represent the bending stiffness expected to be found in shell formulations. These particular finite elements are formulated for finite deformation and inelastic material response, and, as such, are not based on some of the elegant formulations that can be found in an elastic, infinitesimal finite element setting. Each shell element is subjected to a series of 12 verification and validation test problems. The underlying purpose of the tests here is to identify the quality of both the spatially discrete finite element gradient operator and the spatially discrete finite element divergence operator. If the derivation of the finite element is proper, the discrete divergence operator is the transpose of the discrete gradient operator. An overall summary is provided from which one can rank, at least in an average sense, how well the individual formulations can be expected to perform in applications encountered year in and year out. A letter grade has been assigned albeit sometimes subjectively for each shell element and each test problem result. The number of A's, B's, C's, et cetera assigned have been totaled, and a grade point average (GPA) has been computed, based on a 4.0-system. These grades, combined with a comparison between the test problems and the application problem, can be used to guide an analyst to select the element with the best shell formulation.

  8. Nuclear shell-model code for massive parallel computation, "KSHELL"

    E-Print Network [OSTI]

    Noritaka Shimizu

    2013-10-21T23:59:59.000Z

    A new code for nuclear shell-model calculations, "KSHELL", is developed. It aims at carrying out both massively parallel computation and single-node computation in the same manner. We solve the Schr\\"{o}dinger's equation in the $M$-scheme shell-model model space, utilizing Thick-Restart Lanczos method. During the Lanczos iteration, the whole Hamiltonian matrix elements are generated "on-the-fly" in every matrix-vector multiplication. The vectors of the Lanczos method are distributed and stored on memory of each parallel node. We report that the newly developed code has high parallel efficiency on FX10 supercomputer and a PC with multi-cores.

  9. An improved shell of revolution element utilizing cubic displacement functions

    E-Print Network [OSTI]

    Mebane, Paul Mitchell

    2012-06-07T23:59:59.000Z

    -curved sheli of revolu Lion element developed by Stricklin, et al. ' uses polynomial displac ment functions similar 11 to Eq. (I. l) in the m. ridional direction and a Fourier series in the cir "umferential direction. For axisyrmetric loadinc, this fi. Id..., and e are defined in Fig. 2-1. The rotations of the normal to the shell about the o- and s -axes are defined by e&3 and e23, respectively. Using th, strains described in Eq, (2 . 4), the strai n energy expression for orthotropi c shells may...

  10. Single-shell tank retrieval program mission analysis report

    SciTech Connect (OSTI)

    Stokes, W.J.

    1998-08-11T23:59:59.000Z

    This Mission Analysis Report was prepared to provide the foundation for the Single-Shell Tank (SST) Retrieval Program, a new program responsible for waste removal for the SSTS. The SST Retrieval Program is integrated with other Tank Waste Remediation System activities that provide the management, technical, and operations elements associated with planning and execution of SST and SST Farm retrieval and closure. This Mission Analysis Report provides the basis and strategy for developing a program plan for SST retrieval. This Mission Analysis Report responds to a US Department of Energy request for an alternative single-shell tank retrieval approach (Taylor 1997).

  11. Overview of Hanford Single Shell Tank (SST) Structural Integrity

    SciTech Connect (OSTI)

    Rast, Richard S. [Washington River Protection Systems, Richland, WA (United States); Washenfelder, Dennis J. [Washington River Protection Systems, Richland, WA (United States); Johnson, Jeremy M. [USDOE Office of River Protection, Richland, WA (United States)

    2013-11-14T23:59:59.000Z

    To improve the understanding of the single-shell tanks (SSTs) integrity, Washington River Protection Solutions, LLC (WRPS), the USDOE Hanford Site tank contractor, developed an enhanced Single-Shell Tank Integrity Project (SSTIP) in 2009. An expert panel on SST integrity, consisting of various subject matters experts in industry and academia, was created to provide recommendations supporting the development of the project. This panel developed 33 recommendations in four main areas of interest: structural integrity, liner degradation, leak integrity and prevention, and mitigation of contamination migration, Seventeen of these recommendations were used to develop the basis for the M-45-10-1 Change Package for the Hanford Federal Agreement and Compliance Order, which is also known as the Tri-Party Agreement. The structural integrity of the tanks is a key element in completing the cleanup mission at the Hanford Site. There are eight primary recommendations related to the structural integrity of Hanford Single-Shell Tanks. Six recommendations are being implemented through current and planned activities. The structural integrity of the Hanford is being evaluated through analysis, monitoring, inspection, materials testing, and construction document review. Structural evaluation in the form of analysis is performed using modern finite element models generated in ANSYS. The analyses consider in-situ, thermal, operating loads and natural phenomena such as earthquakes. Structural analysis of 108 of 149 Hanford Single-Shell Tanks has concluded that the tanks are structurally sound and meet current industry standards. Analysis of the remaining Hanford Single-Shell Tanks is scheduled for FY2014. Hanford Single-Shell Tanks are monitored through a dome deflection program. The program looks for deflections of the tank dome greater than 1/4 inch. No such deflections have been recorded. The tanks are also subjected to visual inspection. Digital cameras record the interior surface of the concrete tanks, looking for cracks and other surface conditions that may indicate signs of structural distress. The condition of the concrete and rebar of the Hanford Single-Shell Tanks is currently being tested and planned for additional activities in the near future. Concrete and rebar removed from the dome of a 65 year old tank was tested for mechanics properties and condition. Results indicated stronger than designed concrete with additional Petrographic examination and rebar completed. Material properties determined from previous efforts combined with current testing and construction document review will help to generate a database that will provide indication of Hanford Single-Shell Tank structural integrity.

  12. Analysis Procedures for Double-Shell Target Concentricity and Wall Thickness

    SciTech Connect (OSTI)

    Sain, J D; Brown, W D; Martz, H E; Schneberk, D J

    2006-03-02T23:59:59.000Z

    The LLNL Target Fabrication Team (TFT) asked the Center for Non-Destructive Characterization (CNDC) to use CNDC's KCAT or Xradia's Micro computed tomography (CT) system to collect three-dimensional (3D) tomographic data of a set of double-shell targets and determine, among other items, the following: (1) the concentricity of the outer surface of the inner shell with respect to the inner surface of the outer shell with an accuracy of 1-2 micrometers, and (2) the wall thickness uniformity of the outer shell with an accuracy of 1-2 micrometers. The CNDC used Xradia's Micro CT system to collect the data. Bill Brown performed the concentricity analysis, and John Sain performed the wall thickness uniformity analysis. Harry Martz provided theoretical guidance, and Dan Schneberk contributed technical (software) support. This document outlines the analysis procedures used in each case. The double-shell targets, as shown in Figures 1 and 2, consist of an inner shell (or capsule), a two-piece spherical aerogel intermediary shell, and a two-piece spherical outer shell. The three elements are designed and fabricated to be concentric--with the aerogel shell acting as a spacer between the inner shell and outer shell--with no to minimum air gaps in the final assembly. The outer diameters of the aerogel and outer shells are 444 and 550 micrometers, respectively, so the wall thickness of the outer shell is 53 micrometers.

  13. HANFORD DOUBLE SHELL TANK THERMAL AND SEISMIC PROJECT SEISMIC ANALYSIS OF HANFORD DOUBLE SHELL TANKS

    SciTech Connect (OSTI)

    MACKEY TC; RINKER MW; CARPENTER BG; HENDRIX C; ABATT FG

    2009-01-15T23:59:59.000Z

    M&D Professional Services, Inc. (M&D) is under subcontract to Pacific Northwest National Laboratories (PNNL) to perform seismic analysis of the Hanford Site Double-Shell Tanks (DSTs) in support of a project entitled Double-Shell Tank (DST) Integrity Project - DST Thermal and Seismic Analyses. The original scope of the project was to complete an up-to-date comprehensive analysis of record of the DST System at Hanford in support of Tri-Party Agreement Milestone M-48-14. The work described herein was performed in support of the seismic analysis of the DSTs. The thermal and operating loads analysis of the DSTs is documented in Rinker et al. (2004). Although Milestone M-48-14 has been met, Revision I is being issued to address external review comments with emphasis on changes in the modeling of anchor bolts connecting the concrete dome and the steel primary tank. The work statement provided to M&D (PNNL 2003) required that a nonlinear soil structure interaction (SSI) analysis be performed on the DSTs. The analysis is required to include the effects of sliding interfaces and fluid sloshing (fluid-structure interaction). SSI analysis has traditionally been treated by frequency domain computer codes such as SHAKE (Schnabel, et al. 1972) and SASSI (Lysmer et al. 1999a). Such frequency domain programs are limited to the analysis of linear systems. Because of the contact surfaces, the response of the DSTs to a seismic event is inherently nonlinear and consequently outside the range of applicability of the linear frequency domain programs. That is, the nonlinear response of the DSTs to seismic excitation requires the use of a time domain code. The capabilities and limitations of the commercial time domain codes ANSYS{reg_sign} and MSC Dytran{reg_sign} for performing seismic SSI analysis of the DSTs and the methodology required to perform the detailed seismic analysis of the DSTs has been addressed in Rinker et al (2006a). On the basis of the results reported in Rinker et al. (2006a), it is concluded that time-domain SSI analysis using ANSYS{reg_sign} is justified for predicting the global response of the DSTs. The most significant difference between the current revision (Revision 1) of this report and the original issue (Revision 0) is the treatment of the anchor bolts that tie the steel dome of the primary tank to the concrete tank dome.

  14. HANFORD DOUBLE SHELL TANK (DST) THERMAL & SEISMIC PROJECT SEISMIC ANALYSIS OF HANFORD DOUBLE SHELL TANKS

    SciTech Connect (OSTI)

    MACKEY, T.C.

    2006-03-17T23:59:59.000Z

    M&D Professional Services, Inc. (M&D) is under subcontract to Pacific Northwest National Laboratory (PNNL) to perform seismic analysis of the Hanford Site double-shell tanks (DSTs) in support of a project entitled ''Double-Shell Tank (DSV Integrity Project--DST Thermal and Seismic Analyses)''. The overall scope of the project is to complete an up-to-date comprehensive analysis of record of the DST system at Hanford in support of Tri-Party Agreement Milestone M-48-14, The work described herein was performed in support of the seismic analysis of the DSTs. The thermal and operating loads analysis of the DSTs is documented in Rinker et al. (2004). The work statement provided to M&D (PNNL 2003) required that the seismic analysis of the DSTs assess the impacts of potentially non-conservative assumptions in previous analyses and account for the additional soil mass due to the as-found soil density increase, the effects of material degradation, additional thermal profiles applied to the full structure including the soil-structure response with the footings, the non-rigid (low frequency) response of the tank roof, the asymmetric seismic-induced soil loading, the structural discontinuity between the concrete tank wall and the support footing and the sloshing of the tank waste. The seismic analysis considers the interaction of the tank with the surrounding soil and the effects of the primary tank contents. The DSTs and the surrounding soil are modeled as a system of finite elements. The depth and width of the soil incorporated into the analysis model are sufficient to obtain appropriately accurate analytical results. The analyses required to support the work statement differ from previous analysis of the DSTs in that the soil-structure interaction (SSI) model includes several (nonlinear) contact surfaces in the tank structure, and the contained waste must be modeled explicitly in order to capture the fluid-structure interaction behavior between the primary tank and contained waste.

  15. Placing Refuge: Shell Mounds and the Archaeology of Colonial Encounters in the San Francisco Bay Area, California

    E-Print Network [OSTI]

    Schneider, Tsim Duncan

    2010-01-01T23:59:59.000Z

    fragment unIDed seed unIDed shell/testa Wood (g) Residue (g)Shellfishing, and the Shell Mound Archaic. In Engendering1991b Normative Thinking and Shell-Bearing Sites. In

  16. Comparison of direct plating versus filtering of egg shells inoculated with Salmonella typhimurium

    E-Print Network [OSTI]

    Reynolds, Paige Lea

    2012-06-07T23:59:59.000Z

    Comparison of enumeration of egg shell bacterial load by a conventional direct plating method and a neoteric filtering method was evaluated. Egg shells were inoculated with approximately 10 S. typhimurium organisms. Initial experiments evaluated...

  17. Shell Gas to Liquids in the context of a Future Fuel Strategy...

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

    Shell Gas to Liquids in the context of a Future Fuel Strategy - Technical Marketing Aspects Shell Gas to Liquids in the context of a Future Fuel Strategy - Technical Marketing...

  18. Rigid-Plastic Approximations for Predicting Plastic Deformation of Cylindrical Shells Subject to Dynamic Loading

    E-Print Network [OSTI]

    Hoo Fatt, Michelle S.

    A theoretical approach was developed for predicting the plastic deformation of a cylindrical shell subject to asymmetric dynamic loads. The plastic deformation of the leading generator of the shell is found by solving for ...

  19. Coextruded Polyethylene and Wood-Flour Composite: Effect of Shell Thickness, Wood Loading, and Core

    E-Print Network [OSTI]

    Coextruded Polyethylene and Wood-Flour Composite: Effect of Shell Thickness, Wood Loading, and Core recycled polyethylene and wood-flour composites with core­shell structure were manufactured using a pilot

  20. E-Print Network 3.0 - atomic shells m Sample Search Results

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

    edges, the calculations have been performed for clusters size up to 99 atoms (eight atomic shells... absorption spectnun. With two and three shells (17 and 29 atoms) the main...

  1. E-Print Network 3.0 - atomic shells k Sample Search Results

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

    edges, the calculations have been performed for clusters size up to 99 atoms (eight atomic shells... absorption spectnun. With two and three shells (17 and 29 atoms) the main...

  2. E-Print Network 3.0 - atomic shells l Sample Search Results

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

    edges, the calculations have been performed for clusters size up to 99 atoms (eight atomic shells... absorption spectnun. With two and three shells (17 and 29 atoms) the main...

  3. E-Print Network 3.0 - atomic shells Sample Search Results

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

    edges, the calculations have been performed for clusters size up to 99 atoms (eight atomic shells... absorption spectnun. With two and three shells (17 and 29 atoms) the main...

  4. QED E ects on Inner Shells of Heavy W. R. Johnson

    E-Print Network [OSTI]

    Johnson, Walter R.

    QED E#11;ects on Inner Shells of Heavy Atoms W. R. Johnson #3; Department of Physics, University on this subject by Johnson and Cheng. [2] The experimental binding energy of a K-shell electron in a heavy atom

  5. The effect of geometry and topology on the mechanics of grid shells

    E-Print Network [OSTI]

    Malek, Samar R. (Samar Rula)

    2012-01-01T23:59:59.000Z

    The use of grid shell structures in architecture and structural engineering has risen in the past decade, yet fundamental research on the mechanics of such structures is lacking. Grid shells are long span structures comprised ...

  6. Entropy of a self-gravitating electrically charged thin shell and the black hole limit

    E-Print Network [OSTI]

    Lemos, Jos P S; Zaslavski, Oleg B

    2015-01-01T23:59:59.000Z

    A static self-gravitating electrically charged spherical thin shell embedded in a (3+1)-dimensional spacetime is used to study the thermodynamic and entropic properties of the corresponding spacetime. Inside the shell, the spacetime is flat, outside it is Reissner-Nordstr\\"om, and this establishes the energy density, the pressure, and the electric charge in the shell. Imposing that the shell is at a given local temperature and that the first law of thermodynamics holds on the shell one can find the integrability conditions for the temperature and for the thermodynamic electric potential, the thermodynamic equilibrium states, and the thermodynamic stability conditions. Through the integrability conditions and the first law of thermodynamics an expression for the shell's entropy can be calculated. It is found that the shell's entropy is a function of the shell's gravitational and Cauchy radii alone. A plethora of sets of temperature and electric potential equations of state can be given. One set of equations of...

  7. Hollow Core-Shell Structured Porous Si-C Nanocomposites for Li...

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

    Hollow Core-Shell Structured Porous Si-C Nanocomposites for Li-Ion Battery Anodes. Hollow Core-Shell Structured Porous Si-C Nanocomposites for Li-Ion Battery Anodes. Abstract:...

  8. A Yolk-Shell Design for Stabilized and Scalable Li-Ion Battery...

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

    Yolk-Shell Design for Stabilized and Scalable Li-Ion Battery Alloy Anodes. A Yolk-Shell Design for Stabilized and Scalable Li-Ion Battery Alloy Anodes. Abstract: Silicon is...

  9. Ion irradiation of Fe-Fe oxide core-shell nanocluster films:...

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

    irradiation of Fe-Fe oxide core-shell nanocluster films: Effect of interface on stability of magnetic properties. Ion irradiation of Fe-Fe oxide core-shell nanocluster films:...

  10. Iron Oxide-Gold Core-Shell Nanoparticles and Thin-Film Assembly...

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

    Oxide-Gold Core-Shell Nanoparticles and Thin-Film Assembly. Iron Oxide-Gold Core-Shell Nanoparticles and Thin-Film Assembly. Abstract: This paper reports findings of an...

  11. Assembly of ordered carbon shells on semiconducting nanomaterials

    DOE Patents [OSTI]

    Sutter, Eli Anguelova; Sutter, Peter Werner

    2012-10-02T23:59:59.000Z

    In some embodiments of the invention, encapsulated semiconducting nanomaterials are described. In certain embodiments the nanostructures described are semiconducting nanomaterials encapsulated with ordered carbon shells. In some aspects a method for producing encapsulated semiconducting nanomaterials is disclosed. In some embodiments applications of encapsulated semiconducting nanomaterials are described.

  12. Double Shell Tank (DST) Monitor and Control Subsystem Definition Report

    SciTech Connect (OSTI)

    BAFUS, R.R.

    2000-03-16T23:59:59.000Z

    The system description of the Double-Shell Tank (DST) Monitor and Control Subsystem establishes the system boundaries and describes the interface of the DST Monitor and Control Subsystem with new and existing systems that are required to accomplish the Waste Feed Delivery (WFD) mission.

  13. Organized thiol functional groups in mesoporous core shell colloids

    SciTech Connect (OSTI)

    Marchena, Martin H. [Gerencia Quimica, Centro Atomico Constituyentes, Comision Nacional de Energia Atomica (CNEA), Avda. Gral. Paz 1499, B1650KNA Buenos Aires (Argentina); Granada, Mara [Centro Atomico Bariloche-CNEA, 8400 San Carlos de Bariloche (Argentina); Instituto Balseiro-Centro Atomico Bariloche-CNEA, San Carlos de Bariloche 8400 (Argentina); Bordoni, Andrea V. [Gerencia Quimica, Centro Atomico Constituyentes, Comision Nacional de Energia Atomica (CNEA), Avda. Gral. Paz 1499, B1650KNA Buenos Aires (Argentina); Joselevich, Maria [Asociacion Civil Expedicion Ciencia, Cabrera 4948, C1414BGP Buenos Aires (Argentina); Troiani, Horacio [Centro Atomico Bariloche-CNEA, 8400 San Carlos de Bariloche (Argentina); Instituto Balseiro-Centro Atomico Bariloche-CNEA, San Carlos de Bariloche 8400 (Argentina); Williams, Federico J. [DQIAQyF-INQUIMAE FCEN, Universidad de Buenos Aires, Ciudad Universitaria, Pabellon II, C1428EHA Buenos Aires (Argentina); Wolosiuk, Alejandro, E-mail: wolosiuk@cnea.gov.ar [Gerencia Quimica, Centro Atomico Constituyentes, Comision Nacional de Energia Atomica (CNEA), Avda. Gral. Paz 1499, B1650KNA Buenos Aires (Argentina)

    2012-03-15T23:59:59.000Z

    The co-condensation in situ of tetraethoxysilane (TEOS) and mercaptopropyltrimethoxysilane (MPTMS) using cetyltrimethylammonium bromide (CTAB) as a template results in the synthesis of multilayered mesoporous structured SiO{sub 2} colloids with 'onion-like' chemical environments. Thiol groups were anchored to an inner selected SiO{sub 2} porous layer in a bilayered core shell particle producing different chemical regions inside the colloidal layered structure. X-Ray Photoelectron Spectroscopy (XPS) shows a preferential anchoring of the -SH groups in the double layer shell system, while porosimetry and simple chemical modifications confirm that pores are accessible. We can envision the synthesis of interesting colloidal objects with defined chemical environments with highly controlled properties. - Graphical abstract: Mesoporous core shell SiO{sub 2} colloids with organized thiol groups. Highlights: Black-Right-Pointing-Pointer Double shell mesoporous silica colloids templated with CTAB. Black-Right-Pointing-Pointer Sequential deposition of mesoporous SiO{sub 2} layers with different chemistries. Black-Right-Pointing-Pointer XPS shows the selective functionalization of mesoporous layers with thiol groups.

  14. Electrostatics-driven shape transitions in soft shells

    E-Print Network [OSTI]

    Vikram Jadhao; Creighton K. Thomas; Monica Olvera de la Cruz

    2014-09-12T23:59:59.000Z

    Manipulating the shape of nanoscale objects in a controllable fashion is at the heart of designing materials that act as building blocks for self-assembly or serve as targeted drug delivery carriers. Inducing shape deformations by controlling external parameters is also an important way of designing biomimetic membranes. In this paper, we demonstrate that electrostatics can be used as a tool to manipulate the shape of soft, closed membranes by tuning environmental conditions such as the electrolyte concentration in the medium. Using a molecular dynamics-based simulated annealing procedure, we investigate charged elastic shells that do not exchange material with their environment, such as elastic membranes formed in emulsions or synthetic nanocontainers. We find that by decreasing the salt concentration or increasing the total charge on the shell's surface, the spherical symmetry is broken, leading to the formation of ellipsoids, discs, and bowls. Shape changes are accompanied by a significant lowering of the electrostatic energy and a rise in the surface area of the shell. To substantiate our simulation findings, we show analytically that a uniformly charged disc has a lower Coulomb energy than a sphere of the same volume. Further, we test the robustness of our results by including the effects of charge renormalization in the analysis of the shape transitions and find the latter to be feasible for a wide range of shell volume fractions.

  15. Fitting Single Particle Energies in $sdgh$ Major Shell

    E-Print Network [OSTI]

    Dikmen, E; Cengiz, Y

    2015-01-01T23:59:59.000Z

    We have performed two kinds of non-linear fitting procedures to the single-particle energies in the $sdgh$ major shell to obtain better shell model results. The low-lying energy eigenvalues of the light Sn isotopes with $A=103-110$ in the $sdgh$-shell are calculated in the framework of the nuclear shell model by using CD-Bonn two-body effective nucleon-nucleon interaction. The obtained energy eigenvalues are fitted to the corresponding experimental values by using two different non-linear fitting procedures, i.e., downhill simplex method and clonal selection method. The unknown single-particle energies of the states $2s_{1/2}$, $1d_{3/2}$, and $0h_{11/2}$ are used in the fitting methods to obtain better spectra of the $^{104,106,108,110}$Sn isotopes. We compare the energy spectra of the $^{104,106,108,110}$Sn and $^{103,105,107,109}$Sn isotopes with/without a nonlinear fit to the experimental results.

  16. Fitting Single Particle Energies in $sdgh$ Major Shell

    E-Print Network [OSTI]

    E. Dikmen; O. ztrk; Y. Cengiz

    2015-02-12T23:59:59.000Z

    We have performed two kinds of non-linear fitting procedures to the single-particle energies in the $sdgh$ major shell to obtain better shell model results. The low-lying energy eigenvalues of the light Sn isotopes with $A=103-110$ in the $sdgh$-shell are calculated in the framework of the nuclear shell model by using CD-Bonn two-body effective nucleon-nucleon interaction. The obtained energy eigenvalues are fitted to the corresponding experimental values by using two different non-linear fitting procedures, i.e., downhill simplex method and clonal selection method. The unknown single-particle energies of the states $2s_{1/2}$, $1d_{3/2}$, and $0h_{11/2}$ are used in the fitting methods to obtain better spectra of the $^{104,106,108,110}$Sn isotopes. We compare the energy spectra of the $^{104,106,108,110}$Sn and $^{103,105,107,109}$Sn isotopes with/without a nonlinear fit to the experimental results.

  17. Casimir energy of a spherical shell in $?-$Minkowski spacetime

    E-Print Network [OSTI]

    Hyeong-Chan Kim; Chaiho Rim; Jae Hyung Yee

    2008-12-12T23:59:59.000Z

    We study the Casimir energy of a spherical shell of radius $a$ in $\\kappa$-Minkowski spacetime for a complex field with an asymmetric ordering and obtain the energy up to $O(1/\\kappa^2)$. We show that the vacuum breaks particle and anti-particle symmetry if one requires the spectra to be consistent with the blackbody radiation at the commutative limit.

  18. Wilson lines and gauge invariant off-shell amplitudes

    E-Print Network [OSTI]

    Piotr Kotko

    2014-04-24T23:59:59.000Z

    We study matrix elements of Fourier-transformed straight infinite Wilson lines as a way to calculate gauge invariant tree-level amplitudes with off-shell gluons. The off-shell gluons are assigned "polarization vectors" which (in the Feynman gauge) are transverse to their off-shell momenta and define the direction of the corresponding Wilson line operators. The infinite Wilson lines are first regularized to prove the correctness of the method. We have implemented the method in a computer FORM program that can calculate gluonic matrix elements of Wilson line operators automatically. In addition we formulate the Feynman rules that are convenient in certain applications, e.g. proving the Ward identities. Using both the program and the Feynman rules we calculate a few examples, in particular the matrix elements corresponding to gauge invariant $g^{*}g^{*}g^{*}g$ and $g^{*}g^{*}g^{*}g^{*}g$ processes. An immediate application of the approach is in the high energy scattering, as in a special kinematic setup our results reduce to the form directly related to Lipatov's vertices. Thus the results we present can be directly transformed into Lipatov's vertices, in particular into $RRRP$ and $RRRRP$ vertices with arbitrary "orientation" of reggeized gluons. Since the formulation itself is not restricted to high-energy scattering, we also apply the method to a decomposition of an ordinary on-shell amplitude into a set of gauge invariant objects.

  19. Unitary neutron matter in the on-shell limit

    E-Print Network [OSTI]

    Enrique Ruiz Arriola; Sergio Szpigel; Varese Salvador Timoteo

    2014-12-05T23:59:59.000Z

    We compute the Bertsch parameter for neutron matter by using nucleon-nucleon interactions that are fully diagonal in momentum space. We analyze the on-shell limit with the similarity renormalization group and compare the results for a simple separable toy model to realistic calculations with high precision $NN$ potentials.

  20. Spherically symmetric gravitating shell as a reparametrization invariant system

    E-Print Network [OSTI]

    P. Hajicek; Berne

    1997-08-18T23:59:59.000Z

    The subject of this paper are spherically symmetric thin shells made of barotropic ideal fluid and moving under the influence of their own gravitational field as well as that of a central black hole; the cosmological constant is assumed to be zero. The general super-Hamiltonian derived in a previous paper is rewritten for this spherically symmetric special case. The dependence of the resulting action on the gravitational variables is trivialized by a transformation due to Kucha\\v{r}. The resulting variational principle depends only on shell variables, is reparametrization invariant, and includes both first- and second-class constraints. Several equivalent forms of the constrained system are written down. Exclusion of the second-class constraints leads to a super-Hamiltonian which appears to overlap with that by Ansoldi et al. in a quarter of the phase space. As Kucha\\v{r}' variables are singular at the horizons of both Schwarzschild spacetimes inside and outside the shell, the dynamics is first well-defined only inside of 16 disjoint sectors. The 16 sectors are, however, shown to be contained in a single, connected symplectic manifold and the constraints are extended to this manifold by continuity. Poisson bracket between no two independent spacetime coordinates of the shell vanish at any intersection of two horizons.

  1. The instrumented dynamic perforation test applied to a composite shell

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    The instrumented dynamic perforation test applied to a composite shell S. Pattofatto, H. Tsitsiris Wilson, F-94230 Cachan, France Abstract. Perforation tests are commonly used on composites but give limited results. In this study, a single layer of a thermoplastic woven composite is tested at high

  2. Double Shell Tank AY-102 Radioactive Waste Leak Investigation

    SciTech Connect (OSTI)

    Washenfelder, Dennis J.

    2014-04-10T23:59:59.000Z

    PowerPoint. The objectives of this presentation are to: Describe Effort to Determine Whether Tank AY-102 Leaked; Review Probable Causes of the Tank AY-102 Leak; and, Discuss Influence of Leak on Hanfords Double-Shell Tank Integrity Program.

  3. CALCULATION OF THE NEUTRON NOISE INDUCED BY SHELL-MODE

    E-Print Network [OSTI]

    Demazière, Christophe

    CALCULATION OF THE NEUTRON NOISE INDUCED BY SHELL-MODE FISSION REACTORS CORE-BARREL VIBRATIONS-REGION SLAB REACTOR MODEL CARL SUNDE,* CHRISTOPHE DEMAZI?RE, and IMRE PÁZSIT Chalmers University of Technology for Publication October 12, 2005 The subject of this paper is the calculation of the in-core neutron noise induced

  4. Double Passive Cavitation Detection of OptisonTM Shell Rupture

    E-Print Network [OSTI]

    Illinois at Urbana-Champaign, University of

    Double Passive Cavitation Detection of OptisonTM Shell Rupture Azzdine Y. Ammi1 , Robin O). The experimental setup is based on a passive cavitation detection system described in previous work. However by ultrasonic capsule destruction [3,4]. In previous work using a passive cavitation detection (PCD) system [5

  5. Ultrasonic Examination of Double-Shell Tank 214-AN-101

    SciTech Connect (OSTI)

    Pardini, Allan F.; Posakony, Gerald J.

    2005-11-01T23:59:59.000Z

    COEGMA Engineering Corporation (COGEMA) under a contract from CH2M Hill Hanford Group (CH2M Hill) has performed an ultrasonic examination of selected portions of Double-Shell Tank 241-AN-101. PNNL is responsible for preparing a report(s) that describes the results of the COGEMs ultrasonic examinations.

  6. Semiclassical origin of anomalous shell effect for tetrahedral deformation in radial power-law potential model

    E-Print Network [OSTI]

    Ken-ichiro Arita; Yasunori Mukumoto

    2014-05-09T23:59:59.000Z

    Shell structures in single-particle energy spectra are investigated against regular tetrahedral type deformation using radial power-law potential model. Employing a natural way of shape parametrization which interpolates sphere and regular tetrahedron, we find prominent shell effects at rather large tetrahedral deformations, which bring about shell energies much larger than the cases of spherical and quadrupole type shapes. We discuss the semiclassical origin of these anomalous shell structures using periodic orbit theory.

  7. Stability analysis of thin-shell wormholes from charged black string

    SciTech Connect (OSTI)

    Sharif, M.; Azam, M., E-mail: msharif.math@pu.edu.pk, E-mail: azammath@gmail.com [Department of Mathematics, University of the Punjab, Quaid-e-Azam Campus, Lahore-54590 (Pakistan)

    2013-04-01T23:59:59.000Z

    In this paper, we construct thin-shell wormholes from charged black string through cut and paste procedure and investigate its stability. We assume modified generalized Chaplygin gas as a dark energy fluid (exotic matter) present in the thin layer of matter-shell. The stability of these constructed thin-shell wormholes is investigated in the scenario of linear perturbations. We conclude that static stable as well as unstable configurations are possible for cylindrical thin-shell wormholes.

  8. Invariant Gibbs measures of the energy for shell models of turbulence; the inviscid and viscous cases

    E-Print Network [OSTI]

    Hakima Bessaih; Benedetta Ferrario

    2011-03-10T23:59:59.000Z

    Gaussian measures of Gibbsian type are associated with some shell models of 3D turbulence; they are constructed by means of the energy, a conserved quantity for the 3D inviscid and unforced shell model. We prove the existence of a unique global flow for a stochastic viscous shell model and a global flow for the deterministic inviscid shell model, with the property that these Gibbs measures are invariant for these flows.

  9. Stability Analysis of Thin-Shell Wormholes from Charged Black String

    E-Print Network [OSTI]

    M. Sharif; M. Azam

    2013-05-20T23:59:59.000Z

    In this paper, we construct thin-shell wormholes from charged black string through cut and paste procedure and investigate its stability. We assume modified generalized Chaplygin gas as a dark energy fluid (exotic matter) present in the thin layer of matter-shell. The stability of these constructed thin-shell wormholes is investigated in the scenario of linear perturbations. We conclude that static stable as well as unstable configurations are possible for cylindrical thin-shell wormholes.

  10. Industrial mixing techniques for Hanford double-shell tanks

    SciTech Connect (OSTI)

    Daymo, E.A.

    1997-09-01T23:59:59.000Z

    Jet mixer pumps are currently the baseline technology for sludge mobilization and mixing in one-million gallon double-shell tanks at the Hanford and Savannah River Sites. Improvements to the baseline jet mixer pump technology are sought because jet mixer pumps have moving parts that may fail or require maintenance. Moreover, jet mixers are relatively expensive, they heat the waste, and, in some cases, may not mobilize enough of the sludge. This report documents a thorough literature search for commercially available applicable mixing technologies that could be used for double-shell tank sludge mobilization and mixing. Textbooks, research articles, conference proceedings, mixing experts, and the Thomas Register were consulted to identify applicable technologies. While there are many commercial methods that could be used to mobilize sludge or mix the contents of a one-million gallon tank, few will work given the geometrical constraints (e.g., the mixer must fit through a 1.07-m-diameter riser) or the tank waste properties (e.g., the sludge has such a high yield stress that it generally does not flow under its own weight). Pulsed fluid jets and submersible Flygt mixers have already been identified at Hanford and Savannah River Sites for double-shell tank mixing applications. While these mixing technologies may not be applicable for double-shell tanks that have a thick sludge layer at the bottom (since too many of these mixers would need to be installed to mobilize most of the sludge), they may have applications in tanks that do not have a settled solids layer. Retrieval projects at Hanford and other U.S. Department of Energy sites are currently evaluating the effectiveness of these mixing techniques for tank waste applications. The literature search did not reveal any previously unknown technologies that should be considered for sludge mobilization and mixing in one-million gallon double-shell tanks.

  11. Shell structure and orbit bifurcations in finite fermion systems

    E-Print Network [OSTI]

    A. G. Magner; I. S. Yatsyshyn; K. Arita; M. Brack

    2010-12-07T23:59:59.000Z

    We first give an overview of the shell-correction method which was developed by V. M. Strutinsky as a practicable and efficient approximation to the general selfconsistent theory of finite fermion systems suggested by A. B. Migdal and collaborators. Then we present in more detail a semiclassical theory of shell effects, also developed by Strutinsky following original ideas of M. Gutzwiller. We emphasize, in particular, the influence of orbit bifurcations on shell structure. We first give a short overview of semiclassical trace formulae, which connect the shell oscillations of a quantum system with a sum over periodic orbits of the corresponding classical system, in what is usually called the "periodic orbit theory". We then present a case study in which the gross features of a typical double-humped nuclear fission barrier, including the effects of mass asymmetry, can be obtained in terms of the shortest periodic orbits of a cavity model with realistic deformations relevant for nuclear fission. Next we investigate shell structures in a spheroidal cavity model which is integrable and allows for far-going analytical computation. We show, in particular, how period-doubling bifurcations are closely connected to the existence of the so-called "superdeformed" energy minimum which corresponds to the fission isomer of actinide nuclei. Finally, we present a general class of radial power-law potentials which approximate well the shape of a Woods-Saxon potential in the bound region, give analytical trace formulae for it and discuss various limits (including the harmonic oscillator and the spherical box potentials).

  12. Energy transfer in nanowire solar cells with photon-harvesting shells C. H. Peters,a

    E-Print Network [OSTI]

    McGehee, Michael

    Energy transfer in nanowire solar cells with photon-harvesting shells C. H. Peters,a A. R. Guichard; published online 23 June 2009 The concept of a nanowire solar cell with photon-harvesting shells are bonded to the surface of the SiNWs forming a thin shell. They absorb the low-energy photons

  13. Shell-instability generated waves by low energy electrons on converging magnetic field lines

    E-Print Network [OSTI]

    California at Berkeley, University of

    Shell-instability generated waves by low energy electrons on converging magnetic field lines D of observations of such shell type distributions having positive slope in velocity space at low energies, about 10´cre´au (2006), Shell-instability generated waves by low energy electrons on converging magnetic field lines

  14. SHELL THEORIES ARISING AS LOW ENERGY -LIMIT OF 3D NONLINEAR ELASTICITY

    E-Print Network [OSTI]

    Lewicka, Marta

    SHELL THEORIES ARISING AS LOW ENERGY -LIMIT OF 3D NONLINEAR ELASTICITY MARTA LEWICKA, MARIA to minimizers of suitable lower dimensional limit energies. In this paper we discuss shell theories arising of -limit) of the 3d nonlinear elasticity for thin shells around an arbitrary smooth 2d surface

  15. Local Casimir Energies for a Thin Spherical Shell Ines Cavero-Pelaez,

    E-Print Network [OSTI]

    Milton, Kim

    Local Casimir Energies for a Thin Spherical Shell In´es Cavero-Pel´aez, Kimball A. Milton. In the limit of zero thickness, an ideal -function shell is recovered. The behavior of the energy density of surface divergences and on the energy contained within the shell, are obtained in the weak coupling limit

  16. SHELL THEORIES ARISING AS LOW ENERGY -LIMIT OF 3D NONLINEAR ELASTICITY

    E-Print Network [OSTI]

    SHELL THEORIES ARISING AS LOW ENERGY -LIMIT OF 3D NONLINEAR ELASTICITY By Marta Lewicka Maria that the elastic energy of defor- mations scales like h4, h being the thickness of a shell, we derive a limiting dimensional limit energies. In this paper we discuss shell theories arising as -limits of higher scalings

  17. ANALYTIC STUDY OF SHELL MODELS OF TURBULENCE PETER CONSTANTIN, BORIS LEVANT, AND EDRISS S. TITI

    E-Print Network [OSTI]

    Constantin, Peter

    Abstract. In this paper we study analytically the viscous sabra shell model of energy turbulent cascade. We of the energy-cascade mechanism in turbulence can be found in [2]. The sabra shell model of turbulence describes". The equations of motion of the sabra shell model of turbu- lence have the following form dun dt = i(akn+1un+2u n

  18. Atomic and electronic shells of Al77 X. G. Gong,1,2

    E-Print Network [OSTI]

    Gong, Xingao

    Atomic and electronic shells of Al77 X. G. Gong,1,2 D. Y. Sun,2,1 and Xiao-Qian Wang2 1 Institute shell structures for the experimentally characterized Al77 . The onionlike Al77 structure can be described by a stable Al13 inner core covered by a two-layer atomic shell. The stability of Al77

  19. Polarimetric Remote Sensing in the Visible to Near Infrared James R. Shell II

    E-Print Network [OSTI]

    Salvaggio, Carl

    Polarimetric Remote Sensing in the Visible to Near Infrared by James R. Shell II B.S. Physics Title of Dissertation: Polarimetric Remote Sensing in the Visible to Near Infrared I, James R. Shell II Remote Sensing in the Visible to Near Infrared by James R. Shell II Submitted to the Chester F. Carlson

  20. MEE 452: Example 3-2 ShellShell--andand--Tube Heat Exchanger Analysis:Tube Heat Exchanger Analysis

    E-Print Network [OSTI]

    Kostic, Milivoje M.

    properties (var. T) corrections UA, NTU & = #12;MathCAD S&T HX analysis 6 of 7 HX effectiveness = Qduty & Th minmaxminmax min ,;; ,min)()( C C NTU C UA NTU TC q q q CCCcmCcmC UA CHCpCHpH #12;Tube arrangement in shell

  1. Tunable mechanical and thermal properties of ZnS/CdS core/shell nanowires

    E-Print Network [OSTI]

    Mandal, Taraknath; Maiti, Prabal K

    2015-01-01T23:59:59.000Z

    Using all atom molecular dynamics (MD) simulations, we have studied the mechanical properties of ZnS/CdS core/shell nanowires. Our results show that the coating of a few atomic layer CdS shell on the ZnS nanowire leads to a significant change in the stiffness of the core/shell nanowires compared to the stiffness of pure ZnS nanowires. The binding energy between the core and shell region decreases due to the lattice mismatch at the core-shell interface. This reduction in binding energy plays an important role in determining the stiffness of a core/shell nanowire. We have also investigated the effects of the shell on the thermal conductivity and melting behavior of the nanowires.

  2. Double Shell Tank (DST) Transfer Piping Subsystem Specification

    SciTech Connect (OSTI)

    GRAVES, C.E.

    2000-03-22T23:59:59.000Z

    This specification establishes the performance requirements and provides references to the requisite codes and standards to be applied during design of the Double-Shell Tank (DST) Transfer Piping Subsystem that supports the first phase of Waste Feed Delivery. This specification establishes the performance requirements and provides references to the requisite codes and standards to be applied during design of the Double-Shell Tank (DST) Transfer Piping Subsystem that supports the first phase of waste feed delivery. This subsystem transfers waste between transfer-associated structures (pits) and to the River Protection Project (RPP) Privatization Contractor Facility where it will be processed into an immobilized waste form. This specification is intended to be the basis for new projects/installations (W-521, etc.). This specification is not intended to retroactively affect previously established project design criteria without specific direction by the program.

  3. Double Shell Tank (DST) Process Waste Sampling Subsystem Definition Report

    SciTech Connect (OSTI)

    RASMUSSEN, J.H.

    2000-04-25T23:59:59.000Z

    This report defines the Double-Shell Tank (DST) Process Waste Sampling Subsystem (PWSS). This subsystem definition report fully describes and identifies the system boundaries of the PWSS. This definition provides a basis for developing functional, performance, and test requirements (i.e., subsystem specification), as necessary, for the PWSS. The resultant PWSS specification will include the sampling requirements to support the transfer of waste from the DSTs to the Privatization Contractor during Phase 1 of Waste Feed Delivery.

  4. 241-SY Double Shell Tanks (DST) Integrity Assessment Report

    SciTech Connect (OSTI)

    JENSEN, C.E.

    1999-09-21T23:59:59.000Z

    This report presents the results of the integrity assessment of the 241-SY double-shell tank farm facility located in the 200 West Area of the Hanford Site. The assessment included the design evaluation and integrity examinations of the tanks and concluded that the facility is adequately designed, is compatible with the waste, and is fit for use. Recommendations including subsequent examinations, are made to ensure the continued safe operation of the tanks.

  5. Rotordynamic analysis with shell elements for the transfer matrix method

    E-Print Network [OSTI]

    L'Antigua, Edward Anthony

    1989-01-01T23:59:59.000Z

    Committee) Al B. elazzo1o (Member) John T. Tielki g (Member) Michael J. Rabins (Head of Department) August 1989 111 ABSTRACT Rotordynamic Analysis with Shell Elements for the Transi'er Matrix Method. (August 1989) Edward Anthony L'Antigua, B. M... Varying Bending Load with (-') = . 01, and Varying ( ? ) ratio. Table 2. Nondimensional Flexibilities (aEv ) for Cylindrical Sections (8 = 0) with Varying ( ? ) and (?-) Ratios. Table 3. Nondimensional Flexibilities (bEr = oEr ) for Cylindrical...

  6. Off-Shell NN Potential and Triton Binding Energy

    E-Print Network [OSTI]

    Y. Song; R. Machleidt

    1994-03-31T23:59:59.000Z

    The NONLOCAL Bonn-B potential predicts 8.0 MeV binding energy for the triton (in a charge-dependent 34-channel Faddeev calculation) which is about 0.4 MeV more than the predictions by LOCAL NN potentials. We pin down origin and size of the nonlocality in the Bonn potential, in analytic and numeric form. The nonlocality is due to the use of the correct off-shell Feynman amplitude of one-boson-exchange avoiding the commonly used on-shell approximations which yield the local potentials. We also illustrate how this off-shell behavior leads to more binding energy. We emphasize that the increased binding energy is not due to on-shell differences (differences in the fit of the NN data or phase shifts). In particular, the Bonn-B potential reproduces accurately the $\\epsilon_1$ mixing parameter up to 350 MeV as determined in the recent Nijmegen multi-energy NN phase-shift analysis. Adding the relativistic effect from the relativistic nucleon propagators in the Faddeev equations, brings the Bonn-B result up to 8.2 MeV triton binding. This leaves a difference of only 0.3 MeV to experiment, which may possibly be explained by refinements in the treatment of relativity and the inclusion of other nonlocalities (e.~g., quark-gluon exchange at short range). Thus, it is conceivable that a realistic NN potential which describes the NN data up to 300 MeV correctly may explain the triton binding energy without recourse to 3-N forces; relativity would play a major role for this result.

  7. Energy dissipation statistics in a shell model of turbulence

    E-Print Network [OSTI]

    G. Boffetta; A. Celani; D. Roagna

    1999-09-30T23:59:59.000Z

    The Reynolds number dependence of the statistics of energy dissipation is investigated in a shell model of fully developed turbulence. The results are in agreement with a model which accounts for fluctuations of the dissipative scale with the intensity of energy dissipation. It is shown that the assumption of a fixed dissipative scale leads to a different scaling with Reynolds which is not compatible with numerical results.

  8. Cross Sections for Inner-Shell Ionization by Electron Impact

    SciTech Connect (OSTI)

    Llovet, Xavier, E-mail: xavier@ccit.ub.edu [Centres Cientfics i Tecnolgics, Universitat de Barcelona, Llus Sol i Sabars 1-3, 08028 Barcelona (Spain)] [Centres Cientfics i Tecnolgics, Universitat de Barcelona, Llus Sol i Sabars 1-3, 08028 Barcelona (Spain); Powell, Cedric J. [Materials Measurement Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8370 (United States)] [Materials Measurement Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8370 (United States); Salvat, Francesc [Facultat de Fsica (ECM and ICC), Universitat de Barcelona, Diagonal 645, 08028 Barcelona (Spain)] [Facultat de Fsica (ECM and ICC), Universitat de Barcelona, Diagonal 645, 08028 Barcelona (Spain); Jablonski, Aleksander [Institute of Physical Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, 01-224 Warsaw (Poland)] [Institute of Physical Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, 01-224 Warsaw (Poland)

    2014-03-15T23:59:59.000Z

    An analysis is presented of measured and calculated cross sections for inner-shell ionization by electron impact. We describe the essentials of classical and semiclassical models and of quantum approximations for computing ionization cross sections. The emphasis is on the recent formulation of the distorted-wave Born approximation by Bote and Salvat [Phys. Rev. A 77, 042701 (2008)] that has been used to generate an extensive database of cross sections for the ionization of the K shell and the L and M subshells of all elements from hydrogen to einsteinium (Z = 1 to Z = 99) by electrons and positrons with kinetic energies up to 1 GeV. We describe a systematic method for evaluating cross sections for emission of x rays and Auger electrons based on atomic transition probabilities from the Evaluated Atomic Data Library of Perkins et al. [Lawrence Livermore National Laboratory, UCRL-ID-50400, 1991]. We made an extensive comparison of measured K-shell, L-subshell, and M-subshell ionization cross sections and of L? x-ray production cross sections with the corresponding calculated cross sections. We identified elements for which there were at least three (for K shells) or two (for L and M subshells) mutually consistent sets of cross-section measurements and for which the cross sections varied with energy as expected by theory. The overall average root-mean-square deviation between the measured and calculated cross sections was 10.9% and the overall average deviation was ?2.5%. This degree of agreement between measured and calculated ionization and x-ray production cross sections was considered to be very satisfactory given the difficulties of these measurements.

  9. 241-AY Double Shell Tanks (DST) Integrity Assessment Report

    SciTech Connect (OSTI)

    JENSEN, C.E.

    1999-09-21T23:59:59.000Z

    This report presents the results of the integrity assessment of the 241-AY double-shell tank farm facility located in the 200 East Area of the Hanford Site. The assessment included the design evaluation and integrity examinations of the tanks and concluded that the facility is adequately designed, is compatible with the waste, and is fit for use. Recommendations including subsequent examinations. are made to ensure the continued safe operation of the tanks.

  10. 241-AZ Double Shell Tanks (DST) Integrity Assessment Report

    SciTech Connect (OSTI)

    JENSEN, C.E.

    1999-09-21T23:59:59.000Z

    This report presents the results of the integrity assessment of the 241-A2 double-shell tank farm facility located in the 200 East Area of the Hanford Site. The assessment included the design evaluation and integrity examinations of the tanks and concluded that the facility is adequately designed, is compatible with the waste, and is fit for use. Recommendations including subsequent examinations, are made to ensure the continued safe operation of the tanks.

  11. Single-shell tank interim stabilization project plan

    SciTech Connect (OSTI)

    Ross, W.E.

    1998-03-27T23:59:59.000Z

    Solid and liquid radioactive waste continues to be stored in 149 single-shell tanks at the Hanford Site. To date, 119 tanks have had most of the pumpable liquid removed by interim stabilization. Thirty tanks remain to be stabilized. One of these tanks (C-106) will be stabilized by retrieval of the tank contents. The remaining 29 tanks will be interim stabilized by saltwell pumping. In the summer of 1997, the US Department of Energy (DOE) placed a moratorium on the startup of additional saltwell pumping systems because of funding constraints and proposed modifications to the Hanford Federal Facility Agreement and Consent Order (Tri-Party Agreement) milestones to the Washington State Department of Ecology (Ecology). In a letter dated February 10, 1998, Final Determination Pursuant to Hanford Federal Facility Agreement and Consent Order (Tri-Party Agreement) in the Matter of the Disapproval of the DOE`s Change Control Form M-41-97-01 (Fitzsimmons 1998), Ecology disapproved the DOE Change Control Form M-41-97-01. In response, Fluor Daniel Hanford, Inc. (FDH) directed Lockheed Martin Hanford Corporation (LNMC) to initiate development of a project plan in a letter dated February 25, 1998, Direction for Development of an Aggressive Single-Shell Tank (SST) Interim Stabilization Completion Project Plan in Support of Hanford Federal Facility Agreement and Consent Order (Tri-Party Agreement). In a letter dated March 2, 1998, Request for an Aggressive Single-Shell Tank (SST) Interim Stabilization Completion Project Plan, the DOE reaffirmed the need for an aggressive SST interim stabilization completion project plan to support a finalized Tri-Party Agreement Milestone M-41 recovery plan. This project plan establishes the management framework for conduct of the TWRS Single-Shell Tank Interim Stabilization completion program. Specifically, this plan defines the mission needs and requirements; technical objectives and approach; organizational structure, roles, responsibilities, and interfaces; and operational methods. The plan is based on realistic assumptions and addresses three separate funding scenarios.

  12. Stability of thin-shell interfaces inside compact stars

    E-Print Network [OSTI]

    Jonas P. Pereira; Jaziel G. Coelho; Jorge A. Rueda

    2015-01-05T23:59:59.000Z

    We use the thin-shell Darmois-Israel formalism to model and assess the stability of the interfaces separating phases, e.g. the core and the crust, within compact stars. We exemplify the relevance and non-triviality of this treatment in the simplest case of an incompressible star, in constant pressure phase transitions, and in the case of strange quark stars with crust.

  13. Coupling Extraction From Off-Shell Cross-sections

    E-Print Network [OSTI]

    Baradhwaj Coleppa; Tanumoy Mandal; Subhadip Mitra

    2014-10-09T23:59:59.000Z

    In this note, we present a novel method of extracting the couplings of a new heavy particle to the Standard Model states. Contrary to the usual discovery process which involves studying the on-shell production, we look at regions away from resonance to take advantage of the simple scaling of the cross-section with the couplings. We apply the procedure to the case of a heavy quark as an illustration.

  14. Off-shell Bethe vectors and Drinfeld currents

    E-Print Network [OSTI]

    Sergey Khoroshkin; Stanislav Pakuliak; Vitaly Tarasov

    2006-12-12T23:59:59.000Z

    In this paper we compare two constructions of weight functions (off-shell Bethe vectors) for the quantum affine algebra $U_q(\\hat{\\mathfrak{gl}}_N)$. The first construction comes from the algebraic nested Bethe ansatz. The second one is defined in terms of certain projections of products of Drinfeld currents. We show that two constructions give the same result in tensor products of vector representations of $U_q(\\hat{\\mathfrak{gl}}_N)$.

  15. On-shell Recursion Relations for n-point QCD

    E-Print Network [OSTI]

    Darren Forde

    2006-08-03T23:59:59.000Z

    We present on the use of on-shell recursion relations. These can be used not only for calculating tree amplitudes, including those with masses, but also to compute analytically the missing rational terms of one-loop QCD amplitudes. Combined with the cut-containing pieces calculated using a unitarity approach complete one-loop QCD amplitudes can be derived. This approach is discussed in the context of the adjacent 2-minus all-multiplicity QCD gluon amplitude.

  16. Local and Global Casimir Energies for a Semitransparent Cylindrical Shell

    E-Print Network [OSTI]

    Ines Cavero-Pelaez; Kimball A. Milton; Klaus Kirsten

    2006-09-07T23:59:59.000Z

    The local Casimir energy density and the global Casimir energy for a massless scalar field associated with a $\\lambda\\delta$-function potential in a 3+1 dimensional circular cylindrical geometry are considered. The global energy is examined for both weak and strong coupling, the latter being the well-studied Dirichlet cylinder case. For weak-coupling,through $\\mathcal{O}(\\lambda^2)$, the total energy is shown to vanish by both analytic and numerical arguments, based both on Green's-function and zeta-function techniques. Divergences occurring in the calculation are shown to be absorbable by renormalization of physical parameters of the model. The global energy may be obtained by integrating the local energy density only when the latter is supplemented by an energy term residing precisely on the surface of the cylinder. The latter is identified as the integrated local energy density of the cylindrical shell when the latter is physically expanded to have finite thickness. Inside and outside the delta-function shell, the local energy density diverges as the surface of the shell is approached; the divergence is weakest when the conformal stress tensor is used to define the energy density. A real global divergence first occurs in $\\mathcal{O}(\\lambda^3)$, as anticipated, but the proof is supplied here for the first time; this divergence is entirely associated with the surface energy, and does {\\em not} reflect divergences in the local energy density as the surface is approached.

  17. Off-shell supersymmetry and filtered Clifford supermodules

    E-Print Network [OSTI]

    Charles F. Doran; Michael G. Faux; S. James Gates, Jr.; Tristan Hubsch; Kevin M. Iga; Gregory D. Landweber

    2006-03-05T23:59:59.000Z

    An off-shell representation of supersymmetry is a representation of the super Poincare algebra on a dynamically unconstrained space of fields. We describe such representations formally, in terms of the fields and their spacetime derivatives, and we interpret the physical concept of engineering dimension as an integral grading. We prove that formal graded off-shell representations of one-dimensional N-extended supersymmetry, i.e., the super Poincare algebra p^{1|N}, correspond to filtered Clifford supermodules over Cl(N). We also prove that formal graded off-shell representations of two-dimensional (p,q)-supersymmetry, i.e., the super Poincare algebra p^{1,1|p,q}, correspond to bifiltered Clifford supermodules over Cl(p+q). Our primary tools are the formal deformations of filtered superalgebras and supermodules, which give a one-to-one correspondence between filtered spaces and graded spaces with even degree-shifting injections. This generalizes the machinery developed by Gerstenhaber to prove that every filtered algebra is a deformation of its associated graded algebra. Our treatment extends Gerstenhaber's discussion to the case of filtrations which are compatible with a supersymmetric structure, as well as to filtered modules in addition to filtered algebras. We also describe the analogous constructions for bifiltrations and bigradings.

  18. On the energy invariance of open-shell perturbation theory with respect to unitary transformations of molecular orbitals

    E-Print Network [OSTI]

    Crawford, T. Daniel

    On the energy invariance of open-shell perturbation theory with respect to unitary transformations orbitals leave the energy unchanged. For high- spin open-shell wave functions, spatial orbital rotations-reference open-shell perturbation theories based on a spin-restricted open-shell Hartree-Fock reference function

  19. FRUIT & NUT Plums, Nectarines, Apricots,

    E-Print Network [OSTI]

    Mukhtar, Saqib

    having a groove running down one side of the fruit with a smooth seed. Like peaches, they also set fruit on buds from previous season's growth. Usually the fruit has a dusty white coating or wax bloom such as `Stanley', which is grown fresh and frequently dried and used as prunes. These varieties have poor pro

  20. Alcoholic beverages Nuts and seeds

    E-Print Network [OSTI]

    Ahn, Yong-Yeol

    pork oat tabasco pepper feta cheese tequila malt wheat bread soybean citrus peel wasabi chickpea lard

  1. Axial strain in GaAs/InAs core-shell nanowires

    SciTech Connect (OSTI)

    Biermanns, Andreas; Pietsch, Ullrich [Universitaet Siegen, Festkoerperphysik, 57068 Siegen (Germany)] [Universitaet Siegen, Festkoerperphysik, 57068 Siegen (Germany); Rieger, Torsten; Gruetzmacher, Detlev; Ion Lepsa, Mihail [Peter Gruenberg Institute (PGI-9), Forschungszentrum, 52425 Juelich (Germany) [Peter Gruenberg Institute (PGI-9), Forschungszentrum, 52425 Juelich (Germany); JARA-Fundamentals of Future Information Technology, 52425 Juelich (Germany); Bussone, Genziana [Universitaet Siegen, Festkoerperphysik, 57068 Siegen (Germany) [Universitaet Siegen, Festkoerperphysik, 57068 Siegen (Germany); ESRF, 6 rue Jules Horowitz, BP220, F-38043 Grenoble Cedex (France)

    2013-01-28T23:59:59.000Z

    We study the axial strain relaxation in GaAs/InAs core-shell nanowire heterostructures grown by molecular beam epitaxy. Besides a gradual strain relaxation of the shell material, we find a significant strain in the GaAs core, increasing with shell thickness. This strain is explained by a saturation of the dislocation density at the core-shell interface. Independent measurements of core and shell lattice parameters by x-ray diffraction reveal a relaxation of 93% in a 35 nm thick InAs shell surrounding cores of 80 nm diameter. The compressive strain of -0.5% compared to bulk InAs is accompanied by a tensile strain up to 0.9% in the GaAs core.

  2. The Effect of Negative-Energy Shells on the Schwarzschild Black Hole

    E-Print Network [OSTI]

    Jeffrey S Hazboun; Tevian Dray

    2009-07-03T23:59:59.000Z

    We construct Penrose diagrams for Schwarzschild spacetimes joined by massless shells of matter, in the process correcting minor flaws in the similar diagrams drawn by Dray and 't Hooft, and confirming their result that such shells generate a horizon shift. We then consider shells with negative energy density, showing that the horizon shift in this case allows for travel between the heretofore causally separated exterior regions of the Schwarzschild geometry. These drawing techniques are then used to investigate the properties of successive shells, joining multiple Schwarzschild regions. Again, the presence of negative-energy shells leads to a causal connection between the exterior regions, even in (some) cases with two successive shells of equal but opposite total energy.

  3. Pair of null gravitating shells I. Space of solutions and its symmetries

    E-Print Network [OSTI]

    P. Hajicek; I. Kouletsis

    2001-12-22T23:59:59.000Z

    The dynamical system constituted by two spherically symmetric thin shells and their own gravitational field is studied. The shells can be distinguished from each other, and they can intersect. At each intersection, they exchange energy on the Dray, 't Hooft and Redmount formula. There are bound states: if the shells intersect, one, or both, external shells can be bound in the field of internal shells. The space of all solutions to classical dynamical equations has six components; each has the trivial topology but a non trivial boundary. Points within each component are labeled by four parameters. Three of the parameters determine the geometry of the corresponding solution spacetime and shell trajectories and the fourth describes the position of the system with respect to an observer frame. An account of symmetries associated with spacetime diffeomorphisms is given. The group is generated by an infinitesimal time shift, an infinitesimal dilatation and a time reversal.

  4. Finite element plate formulation including transverse shear effects for representing composite shell structures

    E-Print Network [OSTI]

    Hamdallah, Jamil M.

    2012-06-07T23:59:59.000Z

    For Representing Composite Shell Structures. (May 1987) Jsmil M. Hamdallah, B. S. , University of Toledo Chairman of Advisory Committee: Dr. John J. Engblom A finite element formulation for the analysis of thin to moderately thick lam- inated composite shell... in an analysis if delamination is to be avoided. The results obtained in this research confirm the potential use of the element presented as an accurate and eflicient tool in the analysis of thin to moderately thick laminated shell structures. To my parents...

  5. Investigating the static dipole polarisability of noble gas atoms confined in impenetrable spheres and shells

    E-Print Network [OSTI]

    Ludlow, J A

    2015-01-01T23:59:59.000Z

    The static dipole polarisability of noble gas atoms confined by impenetrable spheres and spherical shells is studied using the B-spline random phase with exchange approximation. The general trend in dipole polarisabilities across the noble gas sequence shows a decrease in the dipole polarisability as the volume of the confining impenetrable sphere is reduced and a large increase in the dipole polarisability for confinement by impenetrable spherical shells as the inner shell radius is increased.

  6. Thin-shell wormholes from black holes with dilaton and monopole fields

    E-Print Network [OSTI]

    F. Rahaman; A. Banerjee

    2011-09-08T23:59:59.000Z

    We provide a new type of thin-shell wormhole from the black holes with dilaton and monopole fields. The dilaton and monopole that built the black holes may supply fuel to construct the wormholes. Several characteristics of this thin-shell wormhole have been discussed. Finally, we discuss the stability of the thin-shell wormholes with a "phantom-like" equation of state for the exotic matter at the throat.

  7. Introduction of biotin or folic acid into polypyrrole magnetite core-shell nanoparticles

    SciTech Connect (OSTI)

    Nan, Alexandrina; Turcu, Rodica [National Institute of Research and Development for Isotopic and Molecular Technologies, Donath 65-103, Cluj-Napoca (Romania)] [National Institute of Research and Development for Isotopic and Molecular Technologies, Donath 65-103, Cluj-Napoca (Romania); Liebscher, Jrgen [National Institute of Research and Development for Isotopic and Molecular Technologies, Donath 65-103, Cluj-Napoca, Romania and Institute of Chemistry, Humboldt-University Berlin, Brook-Taylor 2, D-12489 Berlin (Germany)] [National Institute of Research and Development for Isotopic and Molecular Technologies, Donath 65-103, Cluj-Napoca, Romania and Institute of Chemistry, Humboldt-University Berlin, Brook-Taylor 2, D-12489 Berlin (Germany)

    2013-11-13T23:59:59.000Z

    In order to contribute to the trend in contemporary research to develop magnetic core shell nanoparticles with better properties (reduced toxicity, high colloidal and chemical stability, wide scope of application) in straightforward and reproducible methods new core shell magnetic nanoparticles were developed based on polypyrrole shells functionalized with biotin and folic acid. Magnetite nanoparticles stabilized by sebacic acid were used as magnetic cores. The morphology of magnetite was determined by transmission electron microscopy TEM, while the chemical structure investigated by FT-IR.

  8. Screening of the Reissner-Nordstrm charge by a thin-shell of dust matter

    E-Print Network [OSTI]

    S. Habib Mazharimousavi; M. Halilsoy

    2015-03-17T23:59:59.000Z

    A concentric thin-shell encircling a Reissner-Nordstr\\"om (RN) black hole screens the internal charge completely to match with an external Schwarzschild (S) black hole. The negative mass thin-shell is shown to be stable against radial perturbations. It is shown further that by reversing the roles of inside (RN) and outside (S) geometries the mass of the appropriate shell becomes positive.

  9. Off-shell scattering amplitudes in the double-logarithmic approximation

    E-Print Network [OSTI]

    B. I. Ermolaev; M. Greco; F. Olness; S. I. Troyan

    2005-06-29T23:59:59.000Z

    When scattering amplitudes are calculated in the double-logarithmic approximation, it is possible to relate the double-logarithmic on-shell and off-shell amplitudes. Explicit relations are obtained for scattering amplitudes in QED, QCD, and the ElectroWeak Standard Model. The off-shell amplitudes are considered in the hard and the Regge kinematic limits. We compare our results in both the Feynman and Coulomb gauges.

  10. Screening of the Reissner-Nordstr\\"om charge by a thin-shell of dust matter

    E-Print Network [OSTI]

    Mazharimousavi, S Habib

    2015-01-01T23:59:59.000Z

    A concentric thin-shell encircling a Reissner-Nordstr\\"om (RN) black hole screens the internal charge completely to match with an external Schwarzschild (S) black hole. The negative mass thin-shell is shown to be stable against radial perturbations. It is shown further that by reversing the roles of inside (RN) and outside (S) geometries the mass of the appropriate shell becomes positive.

  11. Thin-shell wormholes supported by total normal matter

    E-Print Network [OSTI]

    S. Habib Mazharimousavi; M. Halilsoy

    2014-09-29T23:59:59.000Z

    The Zipoy-Voorhees-Weyl (ZVW) spacetime characterized by mass ($M$) and oblateness ($\\delta $) is proposed in the construction of viable thin-shell wormholes (TSWs). Departure from spherical / cylindrical symmetry yields positive total energy in spite of the fact that local energy density may take negative values. We show that oblateness of the bumpy sources / black holes can be incorporated as a new degree of freedom that may play role in the resolution of the exotic matter problem in TSWs. Small velocity perturbation reveals, however, that the resulting TSW is unstable.

  12. Off-Shell Scalar Supermultiplet in the Unfolded Dynamics Approach

    E-Print Network [OSTI]

    N. G. Misuna; M. A. Vasiliev

    2014-06-09T23:59:59.000Z

    We show how manifestly supersymmetric action for Wess-Zumino model can be constructed within the unfolded dynamics approach. The off-shell unfolded system for N = 1, D = 4 scalar supermultiplet is found. The action is presented in the form of integral of a closed 4-form over any (4, 0) surface in superspace as well as a superspace integral of an integral form or a chiral integral form. The proposed method is argued to provide a most general tool for the analysis of manifestly supersymmetric functionals.

  13. On Hilbert after slide 4 1 echo $SHELL

    E-Print Network [OSTI]

    Dahl, David B.

    On Hilbert after slide 4 1 echo $SHELL 2 ls ­la /bin/*sh* 3 clear 4 ls 5 cat get 6 ls ­la get after slide 5 1 cat Rb 2 cat rnorm.R 3 ./R 4 ls ­la Rb 5 chmod +x Rb 6 cat Rb 7 man ls 8 ls ­c *.out 9 ls ­lc *.out 10 man head 11 ./Rb rnorm.R 12 clear On Hilbert after slide 7 1 cat res 2 man

  14. "Field-shell" of the self-interacting quantum electron

    E-Print Network [OSTI]

    Peter Leifer; Taha Massalha

    2010-08-23T23:59:59.000Z

    Self-interacting dynamics of non-local Dirac's electron has been proposed. This dynamics was revealed by the projective representation of operators corresponding to spin/charge degrees of freedom. Energy-momentum field is described by the system of quasi-linear ``field-shell" PDE's following from the conservation law expressed by the affine parallel transport in $CP(3)$ \\cite{Le1}. We discuss here solutions of these equations in the connection with the following problems: curvature of $CP(3)$ as a potential source of electromagnetic fields and the self-consistent problem of the electron mass.

  15. Casimir interactions of an object inside a spherical metal shell

    E-Print Network [OSTI]

    Saad Zaheer; Sahand Jamal Rahi; Thorsten Emig; Robert L. Jaffe

    2009-11-03T23:59:59.000Z

    We investigate the electromagnetic Casimir interactions of an object contained within an otherwise empty, perfectly conducting spherical shell. For a small object we present analytical calculations of the force, which is directed away from the center of the cavity, and the torque, which tends to align the object opposite to the preferred alignment outside the cavity. For a perfectly conducting sphere as the interior object, we compute the corrections to the proximity force approximation (PFA) numerically. In both cases the results for the interior configuration match smoothly onto those for the corresponding exterior configuration.

  16. Cylindrical Thin-shell Wormholes in $f(R)$ gravity

    E-Print Network [OSTI]

    M. Sharif; Z. Yousaf

    2014-04-20T23:59:59.000Z

    In this paper, we employ cut and paste scheme to construct thin-shell wormhole of a charged black string with $f(R)$ terms. We consider $f(R)$ model as an exotic matter source at wormhole throat. The stability of the respective solutions are analyzed under radial perturbations in the context of $R+{\\delta}R^2$ model. It is concluded that both stable as well as unstable solutions do exist for different values of $\\delta$. In the limit $\\delta{\\rightarrow}0$, all our results reduce to general relativity.

  17. Spherical Thin-Shell Wormholes and Modified Chaplygin Gas

    E-Print Network [OSTI]

    M. Sharif; M. Azam

    2013-09-28T23:59:59.000Z

    The purpose of this paper is to construct spherical thin-shell wormhole solutions through cut and paste technique and investigate the stability of these solutions in the vicinity of modified Chaplygin gas. The Darmois-Israel formalism is used to formulate the stresses of the surface concentrating the exotic matter. We explore the stability of the wormhole solutions by using the standard potential method. We conclude that there exist more stable as well as unstable solutions than the previous study with generalized Chaplygin gas \\cite{15}.

  18. Shell. The Evolution of Movement Continues | Department of Energy

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

    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 on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion |Energy Usage » SearchEnergyDepartment of EnergyLight-Duty Diesel Ultra-DeepwaterShell.

  19. Fusion Hindrance and the Role of Shell Effects in the Superheavy Mass Region

    E-Print Network [OSTI]

    Y. Aritomo

    2006-09-13T23:59:59.000Z

    We present the first attempt of the systematical investigation about the effects of shell correction energy for dynamical processes, which include fusion, fusion-fission and quasi-fission processes. In the superheavy mass region, for the fusion process, the shell correction energy plays a very important role and enhances the fusion probability, when the colliding partner has strong shell structure. By analyzing the trajectory in the three-dimensional coordinate space with a Langevin equation, we reveal the mechanism of the enhancement of the fusion probability caused by shell effects.

  20. Fusion Hindrance and the Role of Shell Effects in the Superheavy Mass Region

    SciTech Connect (OSTI)

    Aritomo, Y. [Flerov Laboratory of Nuclear Reactions, JINR, Dubna (Russian Federation)

    2006-08-14T23:59:59.000Z

    We present the first attempt of the systematical investigation about the effects of shell correction energy for dynamical processes, which include fusion, fusion-fission and quasi-fission processes. In the superheavy mass region, for the fusion process, the shell correction energy plays a very important role and enhances the fusion probability, when the colliding partner has strong shell structure. By analyzing the trajectory in the three-dimensional coordinate space with a Langevin equation, we reveal the mechanism of the enhancement of the fusion probability caused by shell effects.

  1. Precise estimation of shell model energy by second order extrapolation method

    E-Print Network [OSTI]

    Takahiro Mizusaki; Masatoshi Imada

    2003-02-20T23:59:59.000Z

    A second order extrapolation method is presented for shell model calculations, where shell model energies of truncated spaces are well described as a function of energy variance by quadratic curves and exact shell model energies can be obtained by the extrapolation. This new extrapolation can give more precise energy than those of first order extrapolation method. It is also clarified that first order extrapolation gives a lower limit of shell model energy. In addition to the energy, we derive the second order extrapolation formula for expectation values of other observables.

  2. Shell Gas to Liquids in the context of a Future Fuel Strategy...

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

    * Bulky on-board storage * Shell companies assess locally whether to supply (eg. Argentina) LPG * Lower sulphur, PM, NOx and SOx * Overall emissions similar to CNG *...

  3. Fusion hindrance and roles of shell effects in superheavy mass region

    E-Print Network [OSTI]

    Aritomo, Y

    2006-01-01T23:59:59.000Z

    We present the first attempt of systematically investigating the effects of shell correction energy for a dynamical process, which includes fusion, fusion-fission and quasi-fission processes. In the superheavy mass region, for the fusion process, shell correction energy plays a very important role and enhances the fusion probability when the colliding partner has a strong shell structure. By analyzing the trajectory in three-dimensional coordinate space with the Langevin equation, we reveal the mechanism of the enhancement of the fusion probability caused by `cold fusion valleys'. The temperature dependence of shell correction energy is considered.

  4. Fusion hindrance and roles of shell effects in superheavy mass region

    E-Print Network [OSTI]

    Y. Aritomo

    2006-09-18T23:59:59.000Z

    We present the first attempt of systematically investigating the effects of shell correction energy for a dynamical process, which includes fusion, fusion-fission and quasi-fission processes. In the superheavy mass region, for the fusion process, shell correction energy plays a very important role and enhances the fusion probability when the colliding partner has a strong shell structure. By analyzing the trajectory in three-dimensional coordinate space with the Langevin equation, we reveal the mechanism of the enhancement of the fusion probability caused by `cold fusion valleys'. The temperature dependence of shell correction energy is considered.

  5. E-Print Network 3.0 - accumbens shell mediates Sample Search...

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

    Garret D. Stuber,3 Nathan A... to the nucleus accumbens (NAc) are part of a complex circuit mediating cocaine-directed behaviors. However... and shell) and its relationship...

  6. E-Print Network 3.0 - accumbens shell enhances Sample Search...

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

    Garret D. Stuber,3 Nathan A... to the nucleus accumbens (NAc) are part of a complex circuit mediating cocaine-directed behaviors. However... and shell) and its relationship...

  7. E-Print Network 3.0 - arsenide-zinc selenide core-shell Sample...

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

    as 3D Scaffolds for New Materials: from Mechanically Strong Polymer Crosslinked Aerogels Summary: . Those 3D core-shell superstructures are true multifunctional materials...

  8. FABRICATION AND PROPERTIES OF OER COATED RESORCINOL-FORMALDEHYDE SHELLS FOR OMEGA EXPERIMENTS

    SciTech Connect (OSTI)

    NIKROO,A; CZECHOWICZ,D; PAGUIO,R; GREENWOOD,A.L; TAKAGI,M

    2003-06-01T23:59:59.000Z

    OAK-B135 New high gain designs for direct drive ignition on NIF require foam shells. Scaled down versions of these designs are needed for near term experiments on the OMEGA laser facility at the Laboratory Laser Energetics (LLE). These shells need to be about 1 mm in diameter and 50-100 {micro}m wall thickness and densities of 100-250 mg/cc. In addition, a full density permeation seal needs to be deposited for retention of the fill gas at room temperature or the ice at cryogenic temperatures. They have fabricated such shells using Resorcinol-formaldehyde (R/F) as the selected foam material due to its transparency in the optical region. Extensive characterization of the wall uniformity of these shells has been performed. The foam shells have {approx} 5%-6% non-concentricities on the average. A full density permeation seal has been deposited on the R/F shells using two different techniques. In the first technique R/F shells are coated directly with plasma polymer to thicknesses of 3-4 {micro}m. In the second technique, R/F shells are coated with polyvinylphenol, using a chemical interfacial polymerization technique. Data on surface finish and gas retention for R/F shells coated by both methods are provided.

  9. Method and apparatus for determining diameter and wall thickness of minute hollow spherical shells

    DOE Patents [OSTI]

    Steinman, D.A.

    1980-05-30T23:59:59.000Z

    Method and apparatus for determining diameter and wall thickness of hollow microspheres or shells wherein terminal velocities of shells traveling in fluid-filled conduits of differing diameters are measured. A wall-effect factor is determined as a ratio of the terminal velocities, and shell outside diameter may then be ascertained as a predetermined empirical function of wall-effect factor. For shells of known outside diameter, wall thickness may then be ascertained as a predetermined empirical function of terminal velocity in either conduit.

  10. E-Print Network 3.0 - auter- shell vacancy Sample Search Results

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

    Res. Soc. Symp. Proc. 527, 210 (1998). Summary: interaction signals due to transition-metal vacancies in the first atomic shells of the probes. Possible... quadrupole...

  11. Tss4U BV formerly Holecsol R S Renewable Energy Systems and Shell...

    Open Energy Info (EERE)

    Holecsol, R&S Renewable Energy Systems and Shell Solar Energy) Place: Veldhoven, Netherlands Zip: 5503 Sector: Solar, Wind energy Product: Provides small solar and wind for...

  12. Navier-Stokes equations interacting with a nonlinear elastic fluid shell

    E-Print Network [OSTI]

    C. H. Arthur Cheng; Daniel Coutand; Steve Shkoller

    2006-11-22T23:59:59.000Z

    We study a moving boundary value problem consisting of a viscous incompressible fluid moving and interacting with a nonlinear elastic fluid shell. The fluid motion is governed by the Navier-Stokes equations, while the fluid shell is modeled by a bending energy which extremizes the Willmore functional and a membrane energy that extremizes the surface area of the shell. The fluid flow and shell deformation are coupled together by continuity of displacements and tractions (stresses) along the moving material interface. We prove existence and uniqueness of solutions in Sobolev spaces.

  13. Bathymetric records of marine shelled mollusca from the northeastern shelf of Yucatan, Mexico

    E-Print Network [OSTI]

    Treece, Granvil D

    1977-01-01T23:59:59.000Z

    and rounded, slit anteriorly and notched toward the posterior and the apex. The margin is very crenulated. Rice and Kornicker 51 (1965) reported two shells off the Campeche Bank in 30 fms. Puncturella noachina (Linne, 1771) Two shells, 3 mm in diameter... cancellate sculpture. The interior is glossy with a pit posterior to the slit. The shells agree with the description as interpreted by Abbott (1954). Rimula frenulata Dell, 1889 Q'late 1, Figure a) One shell, 5 mm long x 3 mm wide, was found at 23...

  14. A geometrical model for the description of the AlN shell morphology in GaN-AlN core-shell nanowires

    SciTech Connect (OSTI)

    Hestroffer, Karine; Daudin, Bruno [CEA-CNRS Group Nanophysique et Semiconducteurs, Institut Nel/CNRS-Universit J. Fourier and CEA Grenoble, INAC, SP2M, 17 rue des Martyrs, 38 054 Grenoble (France)] [CEA-CNRS Group Nanophysique et Semiconducteurs, Institut Nel/CNRS-Universit J. Fourier and CEA Grenoble, INAC, SP2M, 17 rue des Martyrs, 38 054 Grenoble (France)

    2013-12-28T23:59:59.000Z

    A geometrical model based on the one formulated by Foxon et al.[J. Cryst. Growth 311, 3423 (2009)] is developed to describe the morphology of AlN shells in GaN-AlN core-shell nanowires grown by plasma-assisted molecular beam epitaxy. The shell aspect ratio is studied as a function of the atomic beam flux incidence angles and of the ratio between Al and N species. The comparison between experimental data and the developed geometrical model suggests the diffusion of about 55% of Al atoms from the side walls to the top surface.

  15. Localized hole effects in inner-shell excitation

    SciTech Connect (OSTI)

    Rescigno, T.N.; Orel, A.E.

    1983-10-14T23:59:59.000Z

    Ab initio calculations of valence shell ionization potentials have shown that orbital relaxation and correlation differences usually make contributions of comparable magnitude. In marked contrast to this observation is the situation for deep core ionization, where correlation differences (approx. 1 eV) play a relatively minor role compared to orbital relaxation (approx. 20 eV). Theoretical calculations have shown that this relaxation is most easily described if the 1s-vacancy created by a K-shell excitation is allowed to localize on one of the atomic centers. For molecules possessing a center of inversion, this means that the molecular orbitals that best describe the final state do not transform as any irreducible representation of the molecular point group. Recent experimental work by Shaw, King, Read and Cvejanovic and by Stefani and coworkers has prompted us to carry out further calculations on N/sub 2/, as well as analogous investigations of 1s/sub N/ ..-->.. ..pi..* excitation in NO and N/sub 2/O. The generalized oscillator strengths display a striking similarity and point to the essential correctness of the localized hole picture for N/sub 2/. The theoretical calculations are briefly described, followed by a summary of the results and comparison to experiment, followed by a short discussion.

  16. Chaotic vibration of a liquid-filled thin cylindrical shell

    SciTech Connect (OSTI)

    Toyoda, Y.; Masuko, Y. [Central Research Inst. of Electric Power Industry, Abiko, Chiba (Japan). Abiko Research Lab.

    1996-12-01T23:59:59.000Z

    Recently, a large number of thin walled cylindrical tanks have been widely used, such as oil-storage tanks, and LMFBR primary components. To assess the safety of these systems against earthquakes, it is of great technical importance to clarify the fluid-coupled vibration characteristics of the systems subjected to certain kinds of dynamic loads. This paper describes an experimental study on the chaos of a partially liquid-filled cylindrical tank under horizontal excitation. The test cylinder with a mean radius of 170 mm was made of polyester film with a nominal thickness of 0.188 mm which was lap-joined along a longitudinal seam and bonded with an aluminum end plate along one edge. Shaking table tests were conducted in order to investigate the dynamic characteristics of the shell response. Several types of limit cycles were observed at lower accelerations, and the instability phenomenon, which jumped at some excitation frequencies, occurred for acceleration amplitudes above a critical value. Finally, at higher excitation accelerations, the shell responses became chaotic. The occurrence of the chaos was recognized by the time history, Poincare map, phase trajectory, power spectrum and a positive Lyapunov exponent calculated from the orbits in the three dimensional phase space. In order to visualize the strange attractor, phase portraits were constructed by embedding the trajectories in the phase space.

  17. Imaging the Expanding Shell of SN 2011dh

    E-Print Network [OSTI]

    de Witt, A; Kamble, A; Soderberg, A M; Brunthaler, A; Zauderer, B; Bartel, N; Rupen, M P

    2015-01-01T23:59:59.000Z

    We report on third epoch VLBI observations of the radio-bright supernova SN 2011dh located in the nearby galaxy (7.8 Mpc) M51. The observations took place at $t=453$ d after the explosion and at a frequency of 8.4 GHz. We obtained a fairly well resolved image of the shell of SN 2011dh, making it one of only six recent supernovae for which resolved images of the ejecta are available. By fitting a spherical shell model directly to the visibility measurements we determine the angular radius of SN 2011dh's radio emission to be $636 \\pm 29$ $\\mu$as . At a distance of 7.8 Mpc, this angular radius corresponds to a linear radius of $(7.4 \\pm 0.3) \\times 10^{16}$ cm and an average expansion velocity since the explosion of $18900^{+2800}_{-2400}$ kms$^{-1}$. We also calculated more precise radius measurements for the earlier VLBI observations and we show that all the measured values of the radius of the emission region, up to $t=453$ d, are still almost perfectly consistent with those derived from fitting synchrotron s...

  18. Critical shell thickness for InAs-Al{sub x}In{sub 1-x}As(P) core-shell nanowires

    SciTech Connect (OSTI)

    Haapamaki, C. M.; LaPierre, R. R. [Department of Engineering Physics, Centre for Emerging Device Technologies, McMaster University, Hamilton, Ontario L8S 4L7 (Canada); Baugh, J. [Institute for Quantum Computing and Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L 3G1 (Canada)

    2012-12-15T23:59:59.000Z

    InAs nanowires with Al{sub x}In{sub 1-x}P or Al{sub x}In{sub 1-x}As shells were grown on GaAs substrates by the Au-assisted vapour-liquid-solid method in a gas source molecular beam epitaxy system. Core diameters and shell thicknesses were measured by transmission electron microscopy (TEM). These measurements were then related to selected area diffraction patterns to verify either interface coherency or relaxation through misfit dislocations. A theoretical strain model is presented to determine the critical shell thickness for given core diameters. Zincblende stiffness parameters are transformed to their wurtzite counterparts via a well known tensor transformation. An energy criterion is then given to determine the shell thickness, at which coherency is lost and dislocations become favourable. Our model only considers axial strain relieved by edge dislocations since they were the only type of dislocation observed directly by TEM.

  19. Proton-proton bremsstrahlung: Consequences of different on-shell-point conditions

    SciTech Connect (OSTI)

    Li, Yi; Liou, M. K.; Schreiber, W. M.; Gibson, B. F. [College of Physics and Technology, Guangxi University, Nanning, Guangxi 530004 (China); Department of Physics and Institute for Nuclear Theory, Brooklyn College of the City University of New York, Brooklyn, New York 11210 (United States); Department of Physics, College of Staten Island of the City University of New York, Staten Island, New York 10314 (United States); Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

    2011-09-15T23:59:59.000Z

    Background: Proton-proton bremsstrahlung (pp{gamma}) is investigated both theoretically and experimentally. The pp{gamma} amplitudes can be classified according to the number and location of on-shell points at which they are evaluated. Quantitative understanding of the effect on the pp{gamma} cross section of using different on-shell-point conditions is lacking, but it is essential to identifying the photon emission mechanism governing the pp{gamma} process. Method: Four different pp{gamma} amplitudes, which include four-on-shell-point amplitudes and one-on-shell-point amplitude, are generated from a realistic one-boson-exchange (ROBE) model for pp scattering. These ROBE amplitudes are used to investigate the consequence of using different on-shell-point conditions in calculating the pp{gamma} cross sections. Purpose: We verify the validity of the ROBE pp{gamma} amplitudes. We explore similarities between the four-on-shell-point ROBE and two-u-two-t special (TuTts) soft-photon pp{gamma} amplitudes and important differences with the one-on-shell-point ROBE and Low pp{gamma} amplitudes. We demonstrate that the precision Kernfysisch Versneller Instituut (KVI) data can only be described by the four-on-shell-point (ROBE or TuTts) amplitude. We use the ROBE four-on-shell-point amplitude and one-on-shell-point amplitude to investigate systematically the effect of using different on-shell-point conditions to calculate the pp{gamma} cross section. Furthermore, we identify a general principle that governs the process. This general principle is also applicable to other bremsstrahlung processes involving the scattering of two identical nucleons. Results: (i) The four-on-shell-point ROBE (or TuTts) amplitude describes the high-precision KVI data much better than does the one-on-shell-point ROBE (or Low) amplitude. Although the contribution from the anomalous magnetic moment of the proton is very significant, it does not completely dominate the KVI pp{gamma} cross sections. (ii) The four-on-shell-point ROBE (or TuTts) amplitude describes the TRIUMF data better than does the one-on-shell-point ROBE (or Low) amplitude. (iii) The effect on the pp{gamma} cross section of using different on-shell-point conditions is significant in the hard-photon region, i.e., for small proton scattering angles {theta} (={theta}{sub 3}={theta}{sub 4}, symmetric scattering angles) far from the elastic limit ({theta}{yields}45 deg.); in contrast, the effect becomes insignificant in the vicinity of the elastic limit. Near the limit as {theta} tends to 45 deg. (or as the photon energy K approaches zero), the four-on-shell-point and one-on-shell-point amplitudes approach one another, a general principle applicable to all bremsstrahlung processes because only kinematics is involved. Conclusion: The four-on-shell-point ROBE amplitude provides a quantitative description of pp{gamma} cross sections. The anomalous magnetic moment is an important component of the photon emission mechanism. The four-on-shell-point property of the full ROBE amplitude is essential to properly describing the complete range of the precision KVI data and the TRIUMF data, although the one-on-shell-point ROBE amplitude is adequate in the region near the elastic limit.

  20. On a tensor-based finite element model for the analysis of shell structures

    E-Print Network [OSTI]

    Arciniega Aleman, Roman Augusto

    2006-04-12T23:59:59.000Z

    In the present study, we propose a computational model for the linear and nonlinear analysis of shell structures. We consider a tensor-based finite element formulation which describes the mathematical shell model in a natural and simple way by using...

  1. Unique Solutions to Hartree-Fock Equations for Closed Shell Atoms

    E-Print Network [OSTI]

    Unique Solutions to Hartree-Fock Equations for Closed Shell Atoms Marcel Griesemer and Fabian study the problem of uniqueness of solutions to the Hartree and Hartree-Fock equations of atoms. We show, for example, that the Hartree- Fock ground state of a closed shell atom is unique provided the atomic number Z

  2. Vol. 36 (2005) ACTA PHYSICA POLONICA B No 4 NUCLEAR SHELL ENERGY OBTAINED

    E-Print Network [OSTI]

    Pomorski, Krzysztof

    , not over the single- particle energies. The new prescription for ~E is the following: · one definesVol. 36 (2005) ACTA PHYSICA POLONICA B No 4 NUCLEAR SHELL ENERGY OBTAINED BY AVERAGING IN PARTICLE (Received December 13, 2004) A revised version of the shell-correction method, based on a new way

  3. Total energy evaluation in the Strutinsky shell correction method Baojing Zhou and Yan Alexander Wanga

    E-Print Network [OSTI]

    Wang, Yan Alexander

    Total energy evaluation in the Strutinsky shell correction method Baojing Zhou and Yan Alexander February 2007; accepted 12 June 2007; published online 10 August 2007 We analyze the total energy evaluation in the Strutinsky shell correction method SCM of Ullmo et al. Phys. Rev. B 63, 125339 2001 , where

  4. Development of magnetic luminescent core/shell nanocomplex particles with fluorescence using Rhodamine 6G

    SciTech Connect (OSTI)

    Lee, Hee Uk; Song, Yoon Seok [Department of Chemical and Biological Engineering, Korea University, 5 Ga, Anam-Dong, Sungbuk-Gu, Seoul 136-701 (Korea, Republic of)] [Department of Chemical and Biological Engineering, Korea University, 5 Ga, Anam-Dong, Sungbuk-Gu, Seoul 136-701 (Korea, Republic of); Park, Chulhwan [Department of Chemical Engineering, Kwangwoon University, 447-1 Wolgye-Dong, Nowon-Gu, Seoul 139-701 (Korea, Republic of)] [Department of Chemical Engineering, Kwangwoon University, 447-1 Wolgye-Dong, Nowon-Gu, Seoul 139-701 (Korea, Republic of); Kim, Seung Wook, E-mail: kimsw@korea.ac.kr [Department of Chemical and Biological Engineering, Korea University, 5 Ga, Anam-Dong, Sungbuk-Gu, Seoul 136-701 (Korea, Republic of)

    2012-12-15T23:59:59.000Z

    Graphical abstract: Display Omitted Highlights: ? A simple method was developed to synthesize Co-B/SiO{sub 2}/dye/SiO{sub 2} composite particles. ? The magnetic particle shows that highly luminescent and core/shell particles are formed. ? Such core/shell particles can be easily suspended in water. ? The magnetic particles could detect fluorescence for the application of biosensor. -- Abstract: A simple and reproducible method was developed to synthesize a novel class of Co-B/SiO{sub 2}/dye/SiO{sub 2} composite core/shell particles. Using a single cobalt core, Rhodamine 6G of organic dye molecules was entrapped in a silica shell, resulting in core/shell particles of ?200 nm diameter. Analyses using a variety of techniques such as transmission electron microscopy, X-ray photoelectron spectroscopy, vibration sample magnetometry, confocal laser scanning microscopy, and fluorescence intensity demonstrated that dye molecules were trapped inside the core/shell particles. A photoluminescence investigation showed that highly luminescent and photostable core/shell particles were formed. Such core/shell particles can be easily suspended in water. The synthesized magnetic particles could be used to detect fluorescence on glass substrate arrays for bioassay and biosensor applications.

  5. Geometrodynamics of a thin shell in the Reissner-Nordstrm metric

    SciTech Connect (OSTI)

    Chernov, S. V., E-mail: chernov@lpi.ru [Russian Academy of Sciences, Astrospace Center, Lebedev Physical Institute (Russian Federation)

    2013-11-15T23:59:59.000Z

    The geometrodynamics of a thin, dust, electrically neutral shell in the metric of a charged Reissner-Nordstrm black hole is considered. The Arnowitt-Deser-Misner formalism is used to construct the thin-shell Hamiltonian. The wave equation is derived. The wave equation is shown to be a second-order homogeneous difference equation. Exact analytical solutions have been found.

  6. Consistent off-shell $?N N$ vertex and nucleon self-energy

    E-Print Network [OSTI]

    S. Kondratyuk; O. Scholten

    1998-11-05T23:59:59.000Z

    We present a consistent calculation of half-off-shell form factors in the pion-nucleon vertex and the nucleon self-energy. Numerical results are presented. Near the on-shell point the pion-nucleon vertex is dominated by the pseudovector coupling, while at large nucleon invariant masses we find a sizable pseudoscalar admixture.

  7. Triple-picket warm plastic-shell implosions on OMEGA P. B. Radha,1

    E-Print Network [OSTI]

    Triple-picket warm plastic-shell implosions on OMEGA P. B. Radha,1 C. Stoeckl,1 V. N. Goncharov,1 J-gas-filled plastic shells are imploded by direct irradiation from the OMEGA laser T. R. Boehly et al., Opt. Commun

  8. PHYSICAL REVIEW C 77, 064308 (2008) Effective shell model Hamiltonians from density functional theory: Quadrupolar and

    E-Print Network [OSTI]

    Bertsch George F.

    for mapping a self-consistent mean-field theory (also known as density functional theory) onto a shell-state solution of this density functional theory at the Hartree-Fock plus BCS level, an effective shell-consistent mean-field (SCMF) approximation [1], also known as density functional theory (DFT

  9. Self-assembly of polyhedral shells: A molecular dynamics study D. C. Rapaport*

    E-Print Network [OSTI]

    Rapaport, Dennis C.

    Self-assembly of polyhedral shells: A molecular dynamics study D. C. Rapaport* Physics Department) The use of reduced models for investigating the self-assembly dynamics underlying protein shell formation in spherical viruses is described. The spontaneous self-assembly of these polyhedral, supramolecular structures

  10. HANFORD DOUBLE SHELL TANK (DST) THERMAL & SEISMIC PROJECT SUMMARY OF COMBINED THERMAL & OPERATING LOADS

    SciTech Connect (OSTI)

    MACKEY, T.C.

    2006-03-17T23:59:59.000Z

    This report summarizes the results of the Double-Shell Tank Thermal and Operating Loads Analysis (TOLA) combined with the Seismic Analysis. This combined analysis provides a thorough, defensible, and documented analysis that will become a part of the overall analysis of record for the Hanford double-shell tanks (DSTs).

  11. Evolution of the N = 28 shell closure: a test bench for nuclear forces

    E-Print Network [OSTI]

    Boyer, Edmond

    Evolution of the N = 28 shell closure: a test bench for nuclear forces O. Sorlin1 and M.-G. Porquet;The N = 28 shell closure: a test bench for nuclear forces 2 reach a value of 4.8 MeV. This effect has and 90). More generally, questions related to the evolution of nuclear forces towards the drip

  12. Collective enhancement of nuclear state densities by the shell model Monte Carlo approach

    E-Print Network [OSTI]

    zen, C; Nakada, H

    2015-01-01T23:59:59.000Z

    The shell model Monte Carlo (SMMC) approach allows for the microscopic calculation of statistical and collective properties of heavy nuclei using the framework of the configuration-interaction shell model in very large model spaces. We present recent applications of the SMMC method to the calculation of state densities and their collective enhancement factors in rare-earth nuclei.

  13. NANO EXPRESS Open Access Au/Pd core-shell nanoparticles with varied hollow

    E-Print Network [OSTI]

    Liu, Fuqiang

    NANO EXPRESS Open Access Au/Pd core-shell nanoparticles with varied hollow Au cores for enhanced on hollow Au nanospheres. The unique nanoparticles were characterized by X-ray diffraction, X of the polycrystalline hollow Au nanospheres was reduced, and the structures became highly porous. After the Pd shell

  14. Assessment groundwater monitoring plan for single shell tank waste management area B-BX-BY

    SciTech Connect (OSTI)

    Caggiano, J.A.

    1996-09-27T23:59:59.000Z

    Single Shell Tank Waste Management Area B-BX-BY has been placed into groundwater quality assessment monitoring under interim-status regulations. This document presents background and an assessment groundwater monitoring plan to evaluate any impacts of risks/spills from these Single Shell Tanks in WMA B-BX-BY on groundwater quality.

  15. Tailoring magnetic properties of core/shell nanoparticles and Shouheng Sun

    E-Print Network [OSTI]

    Liu, J. Ping

    in electromagnetic and permanent magnetic applications.10,11 In such a system, the intimate contact be- tween the core and shell leads to effective exchange coupling and therefore cooperative magnetic switching coupled and magneti- zation of both core and shell reverses cooperatively. As a result, the magnetic

  16. Mollusc shell periostracum as an alternative to tissue in isotopic studies

    E-Print Network [OSTI]

    Delong, Michael D.; Thorp, James H.

    2009-06-01T23:59:59.000Z

    such as mollusc shells, however, are often abundant because of their ease of storage. We used stable isotope ratios of carbon and nitrogen to determine if there was a relationship between the isotopic composition of the periostracum of the shell and soft body...

  17. Thin-shell wormholes from charged black holes in generalized dilaton-axion gravity

    E-Print Network [OSTI]

    A. A. Usmani; F. Rahaman; Saibal Ray; Sk. A. Rakib; Z. Hasan; Peter K. F. Kuhfittig

    2010-06-05T23:59:59.000Z

    This paper discusses a new type of thin-shell wormhole constructed by applying the cut-and-paste technique to two copies of a charged black hole in generalized dilaton-axion gravity, which was inspired by low-energy string theory. After analyzing various aspects of this thin-shell wormhole, we discuss its stability to linearized spherically symmetric perturbations.

  18. Avoiding closed timelike curves with a collapsing rotating null dust shell

    E-Print Network [OSTI]

    Filipe C. Mena; Jose Natario; Paul Tod

    2008-02-11T23:59:59.000Z

    We present an idealised model of gravitational collapse, describing a collapsing rotating cylindrical shell of null dust in flat space, with the metric of a spinning cosmic string as the exterior. We find that the shell bounces before closed timelike curves can be formed. Our results also suggest slightly different definitions for the mass and angular momentum of the string.

  19. AT Cnc: A SECOND DWARF NOVA WITH A CLASSICAL NOVA SHELL

    SciTech Connect (OSTI)

    Shara, Michael M.; Mizusawa, Trisha; Zurek, David [Department of Astrophysics, American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024-5192 (United States); Wehinger, Peter [Steward Observatory, the University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721 (United States); Martin, Christopher D.; Neill, James D.; Forster, Karl [Department of Physics, Math and Astronomy, California Institute of Technology, 1200 East California Boulevard, Mail Code 405-47, Pasadena, CA 91125 (United States); Seibert, Mark [Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101 (United States)

    2012-10-20T23:59:59.000Z

    We are systematically surveying all known and suspected Z Cam-type dwarf novae for classical nova shells. This survey is motivated by the discovery of the largest known classical nova shell, which surrounds the archetypal dwarf nova Z Camelopardalis. The Z Cam shell demonstrates that at least some dwarf novae must have undergone classical nova eruptions in the past, and that at least some classical novae become dwarf novae long after their nova thermonuclear outbursts, in accord with the hibernation scenario of cataclysmic binaries. Here we report the detection of a fragmented 'shell', 3 arcmin in diameter, surrounding the dwarf nova AT Cancri. This second discovery demonstrates that nova shells surrounding Z Cam-type dwarf novae cannot be very rare. The shell geometry is suggestive of bipolar, conical ejection seen nearly pole-on. A spectrum of the brightest AT Cnc shell knot is similar to that of the ejecta of the classical nova GK Per, and of Z Cam, dominated by [N II] emission. Galaxy Evolution Explorer FUV imagery reveals a similar-sized, FUV-emitting shell. We determine a distance of 460 pc to AT Cnc, and an upper limit to its ejecta mass of {approx}5 Multiplication-Sign 10{sup -5} M {sub Sun }, typical of classical novae.

  20. MECHANICAL PROPERTIES OF THIN GDP SHELLS USED AS CRYOGENIC DIRECT DRIVE TARGETS AT OMEGA

    SciTech Connect (OSTI)

    NIKROO,A; CZECHOWICZ,D; CHEN,K.C; DICKEN,M; MORRIS,C; ANDREWS,R; GREENWOOD,A.L; CASTILLO,E

    2003-06-01T23:59:59.000Z

    OAK-B135 Thin glow discharge polymer (GDP) shells are currently used as the targets for cryogenic direct drive laser fusion experiments. These shells need to be filled with nearly 1000 atm of D{sub 2} and cooled to cryogenic temperatures without failing due to buckling and bursting pressures they experience in this process. Therefore, the mechanical and permeation properties of these shells are of utmost importance in successful and rapid filling with D{sub 2}. In this paper, they present an overview of buckle and burst pressures of several different types of GDP shells. These include those made using traditional GDP deposition parameters (standard GDP) using a high deposition pressure and using modified parameters (strong GDP) of low deposition pressure that leads to more robust shells.

  1. Pair of null gravitating shells II. Canonical theory and embedding variables

    E-Print Network [OSTI]

    P. Hajicek; I. Kouletsis

    2001-12-28T23:59:59.000Z

    The study of the two shell system started in our first paper ``Pair of null gravitating shells I'' (gr-qc/0112060) is continued. An action functional for a single shell due to Louko, Whiting and Friedman is generalized to give appropriate equations of motion for two and, in fact, any number of spherically symmetric null shells, including the cases when the shells intersect. In order to find the symplectic structure for the space of solutions described in paper I, the pull back to the constraint surface of the Liouville form determined by the action is transformed into new variables. They consist of Dirac observables, embeddings and embedding momenta (the so-called Kucha\\v{r} decomposition). The calculation includes the integration of a set of coupled partial differential equations. A general method of solving the equations is worked out.

  2. Radial Structure of Shell Modulations Near Peak Compression of Spherical Implosions

    SciTech Connect (OSTI)

    Smalyuk, V.A.; Dumanis, S.B.; Marshall, F.J.; Delettrez, J.A.; Meyerhofer, D.D.; Regan, S.P.; Sangster, T.C.; Yaakobi, B.; Koch, J.A.

    2003-03-11T23:59:59.000Z

    The structure of shell modulations is measured at peak compression of directly driven spherical implosions using absorption of titanium-doped layers placed at various distances of 1, 5, 7, and 9 mm from the inner surface of 20-mm-thick plastic CH shells filled with 18 atm of D3He gas. The modulations are measured using the ratios of monochromatic core images taken inside and outside of the titanium 1s-2p absorption spectral region. Peak-compression, time-integrated areal-density modulations are higher at the inner shell surface, which is unstable during the deceleration phase of an implosion with a modulation level of 59{+-}14%, The perturbations are lower in the central part of the shell, having a modulation level of 18{+-}5%. The outer surface of the shell, which is unstable during the acceleration phase of an implosion, has a modulation level of 52{+-}20%.

  3. On the gravitational self-energy of a spherical shell

    E-Print Network [OSTI]

    G. Dillon

    2013-03-14T23:59:59.000Z

    According to Einstein's mass-energy equivalence, a body with a given mass extending in a large region of space, will get a smaller mass when confined into a smaller region, because of its own gravitational energy. The classical self-energy problem has been studied in the past in connection with the renormalization of a charged point particle. Still exact consistent solutions have not been thoroughly discussed in the simpler framework of Newtonian gravity. Here we exploit a spherical symmetrical shell model and find two possible solutions, depending on some additional assumption. The first solution goes back to Arnowitt, Deser and Misner (1960). The second is new and yields a new vanishingly small value (10^-55 cm) for the classical electron radius.

  4. On-shell interference effects in Higgs final states

    E-Print Network [OSTI]

    Christoph Englert; Ian Low; Michael Spannowsky

    2015-02-16T23:59:59.000Z

    Top quark loops in Higgs production via gluon fusion at large invariant final state masses can induce important interference effects in searches for additional Higgs bosons as predicted in, e.g., Higgs portal scenarios and the MSSM when the heavy scalar is broad or the final state resolution is poor. Currently, the limit setting as performed by both ATLAS and CMS is based on injecting a heavy Higgs-like signal neglecting interference effects. In this paper, we perform a study of such "on-shell" interference effects in $pp\\to ZZ$ and find that they lead to a $\\lesssim{\\cal{O}}(30%)$ width scheme-dependent modification of the signal strength. Including the continuum contributions to obtain e.g. the full $pp\\to ZZ \\to 4\\ell$ final state, this modification is reduced to the 10% level in the considered intermediate mass range.

  5. Development of simulation tools for virus shell assembly. Final report

    SciTech Connect (OSTI)

    Berger, Bonnie

    2001-01-05T23:59:59.000Z

    Prof. Berger's major areas of research have been in applying computational and mathematical techniques to problems in biology, and more specifically to problems in protein folding and genomics. Significant progress has been made in the following areas relating to virus shell assembly: development has been progressing on a second-generation self-assembly simulator which provides a more versatile and physically realistic model of assembly; simulations are being developed and applied to a variety of problems in virus assembly; and collaborative efforts have continued with experimental biologists to verify and inspire the local rules theory and the simulator. The group has also worked on applications of the techniques developed here to other self-assembling structures in the material and biological sciences. Some of this work has been conducted in conjunction with Dr. Sorin Istrail when he was at Sandia National Labs.

  6. First Observations of Nonhydrodynamic Mix at the Fuel-Shell Interface in Shock-Driven Inertial Confinement Implosions

    E-Print Network [OSTI]

    Amendt, P.

    A strong nonhydrodynamic mechanism generating atomic fuel-shell mix has been observed in strongly shocked inertial confinement fusion implosions of thin deuterated-plastic shells filled with [superscript 3]He gas. These ...

  7. Effect of shells on photoluminescence of aqueous CdTe quantum dots

    SciTech Connect (OSTI)

    Yuan, Zhimin; Yang, Ping, E-mail: mse_yangp@ujn.edu.cn

    2013-07-15T23:59:59.000Z

    Graphical abstract: Size-tunable CdTe coated with several shells using an aqueous solution synthesis. CdTe/CdS/ZnS quantum dots exhibited high PL efficiency up to 80% which implies the promising applications for biomedical labeling. - Highlights: CdTe quantum dots were fabricated using an aqueous synthesis. CdS, ZnS, and CdS/ZnS shells were subsequently deposited on CdTe cores. Outer ZnS shells provide an efficient confinement of electron and hole inside the QDs. Inside CdS shells can reduce the strain on the QDs. Aqueous CdTe/CdS/ZnS QDs exhibited high stability and photoluminescence efficiency of 80%. - Abstract: CdTe cores with various sizes were fabricated in aqueous solutions. Inorganic shells including CdS, ZnS, and CdS/ZnS were subsequently deposited on the cores through a similar aqueous procedure to investigate the effect of shells on the photoluminescence properties of the cores. In the case of CdTe/CdS/ZnS quantum dots, the outer ZnS shell provides an efficient confinement of electron and hole wavefunctions inside the quantum dots, while the middle CdS shell sandwiched between the CdTe core and ZnS shell can be introduced to obviously reduce the strain on the quantum dots because the lattice parameters of CdS is situated at the intermediate-level between those of CdTe and ZnS. In comparison with CdTe/ZnS coreshell quantum dots, the as-prepared water-soluble CdTe/CdS/ZnS quantum dots in our case can exhibit high photochemical stability and photoluminescence efficiency up to 80% in an aqueous solution, which implies the promising applications in the field of biomedical labeling.

  8. Analysis of an open crown conical shell segment for edge loadings and a linearly varying normal surface loading

    E-Print Network [OSTI]

    Hervey, Donald Gable

    1965-01-01T23:59:59.000Z

    . INTRO DUG TI ON THEORY Page III. Derivation of the Differential Eguation Solution of the Equation CONCLUSIONS 3 11 22 LITERATURE CITED REFERENCES 23 25 LIST OF FIGURES Shell Segment Showing Boondary Stress Resultants Shell Segment Showing... defined by equation (19 ) Thickness of the shell A differential operator defined by equation (18) M, M Rending moments per unit length of a shell perpendicular to the s and Q directions, respec- tively N i N Normal forces per unit length of sections...

  9. The effects of age and season on selected quality characteristics of shell eggs from several strains of commercial laying hens

    E-Print Network [OSTI]

    Izat, Amy Lynn

    1983-01-01T23:59:59.000Z

    ). Therefore, shell thickness, shell weight, and shell weight per unit of egg surface area (SWUSA) are more precisely estimated from egg specific gravity when egg weight is included as a second independent variable (Nordstrom and Oustezhout, 1982... and cotterill (1977) have also suggested that specific gravity is closely correlated with shell thickness. The negative correlation of specific gravity with egg surface area agrees with the findings of Nordstrom and Ousterhout (1982) who reported...

  10. Local Casimir Energies for a Thin Spherical Shell Ines CaveroPelaez, # Kimball A. Milton, + and Je#rey Wagner #

    E-Print Network [OSTI]

    Milton, Kim

    Local Casimir Energies for a Thin Spherical Shell In??es Cavero­Pel??aez, # Kimball A. Milton of the energy density as the surface of the shell is approached is studied in both the strong and weak coupling light on the nature of surface divergences and on the energy contained within the shell, are obtained

  11. A stabilized 3-D co-rotational formulation for geometrically nonlinear analysis of multi-layered composite shells*

    E-Print Network [OSTI]

    Masud, Arif

    -layered composite shells* A. Masud, C. L. Tham, W. K. Liu Abstract This paper presents a continuum-based shear- deformable ®nite element formulation for geometrically nonlinear analysis of thick layered composite shells to highlight the ef®ciency of the method for application to composite shell analysis. Numerical examples

  12. Shell effects in hot nuclei and their influence on nuclear composition in supernova matter

    SciTech Connect (OSTI)

    Nishimura, Suguru [Department of Pure and Applied Physics, Waseda University, 3-4-1 Okubo Shinjuku-ku, Tokyo 169-8555 (Japan); Takano, Masatoshi [Department of Pure and Applied Physics, Waseda University, 3-4-1 Okubo Shinjuku-ku, Tokyo 169-8555, Japan and Research Institute for Science and Engineering, Waseda University, 3-4-1 Okubo Shinjuku-ku, Tokyo 169-8555 (Japan)

    2014-05-02T23:59:59.000Z

    We calculate nuclear composition in supernova (SN) matter explicitly taking into account the temperature dependence of nuclear shell effects. The abundance of nuclei in SN matter is important in the dynamics of core-collapse supernovae and, in recently constructed equations of state (EOS) for SN matter, the composition of nuclei are calculated assuming nuclear statistical equilibrium wherein the nuclear internal free energies govern the composition. However, in these EOS, thermal effects on the shell energy are not explicitly taken into account. To address this shortfall, we calculate herein the shell energies of hot nuclei and examine their influence on the composition of SN matter. Following a simplified macroscopic-microscopic approach, we first calculate single-particle (SP) energies by using a spherical Woods-Saxon potential. Then we extract shell energies at finite temperatures using Strutinsky method with the Fermi distribution as the average occupation probability of the SP levels. The results show that at relatively low temperatures, shell effects are still important and magic nuclei are abundant. However, at temperatures above approximately 2 MeV, shell effects are almost negligible, and the mass fractions with shell energies including the thermal effect are close to those obtained from a simple liquid drop model at finite temperatures.

  13. DETECTING THE RAPIDLY EXPANDING OUTER SHELL OF THE CRAB NEBULA: WHERE TO LOOK

    SciTech Connect (OSTI)

    Wang Xiang; Ferland, G. J. [Department of Physics and Astronomy, University of Kentucky, Lexington, KY 40506 (United States); Baldwin, J. A.; Loh, E. D.; Richardson, C. T., E-mail: xiang.wang@uky.edu [Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-2320 (United States)

    2013-09-10T23:59:59.000Z

    We present a range of steady-state photoionization simulations, corresponding to different assumed shell geometries and compositions, of the unseen postulated rapidly expanding outer shell to the Crab Nebula. The properties of the shell are constrained by the mass that must lie within it, and by limits to the intensities of hydrogen recombination lines. In all cases the photoionization models predict very strong emissions from high ionization lines that will not be emitted by the Crab's filaments, alleviating problems with detecting these lines in the presence of light scattered from brighter parts of the Crab. The near-NIR [Ne VI] {lambda}7.652 {mu}m line is a particularly good case; it should be dramatically brighter than the optical lines commonly used in searches. The C IV {lambda}1549 doublet is predicted to be the strongest absorption line from the shell, which is in agreement with Hubble Space Telescope observations. We show that the cooling timescale for the outer shell is much longer than the age of the Crab, due to the low density. This means that the temperature of the shell will actually ''remember'' its initial conditions. However, the recombination time is much shorter than the age of the Crab, so the predicted level of ionization should approximate the real ionization. In any case, it is clear that IR observations present the best opportunity to detect the outer shell and so guide future models that will constrain early events in the original explosion.

  14. Platinum Monolayer on IrFe CoreShell Nanoparticle Electrocatalysts for the Oxygen Reduction Reaction

    SciTech Connect (OSTI)

    Sasaki K.; Kuttiyiel, K.A.; Su, D.; Adzic, R.R.

    2012-04-19T23:59:59.000Z

    We synthesized high activity and stability platinum monolayer on IrFe core-shell nanoparticle electrocatalysts. Carbon-supported IrFe core-shell nanoparticles were synthesized by chemical reduction and subsequent thermal annealing. The formation of Ir shells on IrFe solid-solution alloy cores has been verified by scanning transmission electron microscopy coupled with energy-loss spectroscopy (EELS) and in situ X-ray absorption spectroscopy. The Pt monolayers were deposited on IrFe core-shell nanoparticles by galvanic replacement of underpotentially deposited Cu adatoms on the Ir shell surfaces. The specific and Pt mass activities for the ORR on the Pt monolayer on IrFe core-shell nanoparticle electrocatalyst are 0.46 mA/cm{sup 2} and 1.1 A/mg{sub Pt}, which are much higher than those on a commercial Pt/C electrocatalyst. High durability of Pt{sub ML}/IrFe/C has also been demonstrated by potential cycling tests. These high activity and durability observed can be ascribed to the structural and electronic interaction between the Pt monolayer and the IrFe core-shell nanoparticles.

  15. Facile approach to prepare hollow coreshell NiO microspherers for supercapacitor electrodes

    SciTech Connect (OSTI)

    Han, Dandan [Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001 (China); College of Chemistry and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin 132022 (China); Xu, Pengcheng [College of Chemistry and Pharmaceutical Engineering, Jilin Institute of Chemical Technology, Jilin 132022 (China); Jing, Xiaoyan [Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001 (China); Wang, Jun, E-mail: zhqw1888@sohu.com [Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001 (China); Institute of Advanced Marine Materials, Harbin Engineering University, Harbin 150001 (China); Song, Dalei; Liu, Jingyuan; Zhang, Milin [Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001 (China)

    2013-07-15T23:59:59.000Z

    A facile lamellar template method (see image) has been developed for the preparation of uniform hollow coreshell structure NiO (HCSNiO) with a nanoarchitectured wall structure. The prepared NiO was found to be highly crystalline in uniform microstructures with high specific surface area and pore volume. The results indicated that ethanol interacted with trisodium citrate played an important role for the formation of hollow coreshell spheres. On the basis of the analysis of the composition and the morphology, a possible formation mechanism was investigated. NiO microspheres with hollow coreshell showed excellent capacitive properties. The exceptional cyclic, structural and electrochemical stability with ?95% coulombic efficiency, and very low ESR value from impedance measurements promised good utility value of hollow coreshell NiO material in fabricating a wide range of high-performance electrochemical supercapacitors. - The hollow coreshell NiO was prepared with a facile lamellar template method. The prepared NiO show higher capacitance, lower ion diffusion resistance and better electroactive surface utilization for Faradaic reactions. - Highlights: Formation of hollow coreshell NiO via a novel and facile precipitation route. Exhibited uniform feature sizes and high surface area of hollow coreshell NiO. Synthesized NiO has high specific capacitance ( 448 F g{sup 1}) and very low ESR value. Increased 20% of long life cycles capability after 500 chargedischarge cycles.

  16. H I SHELLS AND SUPERSHELLS IN THE I-GALFA H I 21 cm LINE SURVEY. I. FAST-EXPANDING H I SHELLS ASSOCIATED WITH SUPERNOVA REMNANTS

    SciTech Connect (OSTI)

    Park, G.; Koo, B.-C. [Department of Physics and Astronomy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742 (Korea, Republic of); Gibson, S. J.; Newton, J. H. [Department of Physics and Astronomy, Western Kentucky University, Bowling Green, KY 42101 (United States); Kang, J.-H.; Lane, D. C.; Douglas, K. A. [Arecibo Observatory, HC 3 Box 53995, Arecibo, PR 00612 (United States); Peek, J. E. G. [Department of Astronomy, Columbia University, New York, NY 10027 (United States); Korpela, E. J. [Space Sciences Laboratory, University of California, Berkeley, CA 94720 (United States); Heiles, C., E-mail: koo@astro.snu.ac.kr [Radio Astronomy Lab, UC Berkeley, 601 Campbell Hall, Berkeley, CA 94720 (United States)

    2013-11-01T23:59:59.000Z

    We search for fast-expanding H I shells associated with Galactic supernova remnants (SNRs) in the longitude range l ? 32 to 77 using 21 cm line data from the Inner-Galaxy Arecibo L-band Feed Array (I-GALFA) H I survey. Among the 39 known Galactic SNRs in this region, we find such H I shells in 4 SNRs: W44, G54.4-0.3, W51C, and CTB 80. All four were previously identified in low-resolution surveys, and three of those (excluding G54.4-0.3) were previously studied with the Arecibo telescope. A remarkable new result, however, is the detection of H I emission at both very high positive and negative velocities in W44 from the receding and approaching parts of the H I expanding shell, respectively. This is the first detection of both sides of an expanding shell associated with an SNR in H I 21 cm emission. The high-resolution I-GALFA survey data also reveal a prominent expanding H I shell with high circular symmetry associated with G54.4-0.3. We explore the physical characteristics of four SNRs and discuss what differentiates them from other SNRs in the survey area. We conclude that these four SNRs are likely the remnants of core-collapse supernovae interacting with a relatively dense (?> 1 cm{sup 3}) ambient medium, and we discuss the visibility of SNRs in the H I 21 cm line.

  17. Off-the-mass shell scattering amplitude in a two-particle potential model

    SciTech Connect (OSTI)

    Coutinho, F.A.B.

    1982-01-01T23:59:59.000Z

    In the textbooks of elementary quantum mechanics, two-particle scattering is treated by introducing the concept of off-the-energy shell scattering amplitude. On the other hand, in relativistic quantum field theory, the need to treat momentum and energy on the same footing forces one to use an off-the-mass shell scattering amplitude. We believe the introducing the off-the-mass shell extrapolation of the scattering amplitude in nonrelativistic quantum mechanics should be illuminating. We try to show this in this paper.

  18. Hamiltonian treatment of collapsing thin shells in Lanczos-Lovelock theories

    SciTech Connect (OSTI)

    Crisostomo, Juan [Departamento de Fisica, Facultad de Fisica y Matematicas, Universidad Concepcion, Casilla 160-C, Concepcion (Chile); Campo, Sergio del; Saavedra, Joel [Instituto de Fisica, Facultad de Ciencias Basicas y Matematicas, Pontificia Universidad Catolica de Valparaiso, Avenida Brasil 2950, Valparaiso (Chile)

    2004-09-15T23:59:59.000Z

    The Hamiltonian treatment for the collapse of thin shells for a family of Lanczos-Lovelock theories is studied. This formalism allows us to carry out a concise analysis of these theories. It is found that the black holes solution can be created by collapsing a thin shell. Naked singularities cannot be formed by this mechanism. Among the different Lanczos-Lovelock theories, the Chern-Simons theory corresponds to an exceptional case, because naked singularities can emerge from the collapse of a thin shell. This kind of theory does not possess a gravitational self-interaction analogous to the Newtonian case.

  19. The analysis of rib-stiffened shallow shells by means of the compliance method

    E-Print Network [OSTI]

    Trainer, Lloyd Douglass

    1967-01-01T23:59:59.000Z

    surface to the middle surface displacements can be expressed as: 1 9U 6 1 R hot (2. . 32) Figure 2. Cylindrical Shallow Shell. 20 ? ( ? + w) 1 av aa (2. 33) (2. 34) 1 B w 2 R 'ok 2 2 1 ~w 2 R 0P 1 b w 2 2 S~b)3 (2. 35) (2. 36) (2. 37... the dimensionless coordinates is located at an angle of the shell, that is, at the point of inter- section of two adjacent edges. The shell will be freely supported along all edges and sustain a uniformly distributed load, i. e. , a pressure, in the direction...

  20. HANFORD DOUBLE SHELL TANK (DST) THERMAL & SEISMIC PROJECT BUCKLING EVALUATION METHODS & RESULTS FOR THE PRIMARY TANKS

    SciTech Connect (OSTI)

    MACKEY, T.C.

    2006-03-17T23:59:59.000Z

    This report documents a detailed buckling evaluation of the primary tanks in the Hanford double shell waste tanks. The analysis is part of a comprehensive structural review for the Double-Shell Tank Integrity Project. This work also provides information on tank integrity that specifically responds to concerns raise by the Office of Environment, Safety, and Health (ES&H) Oversight (EH-22) during a review (in April and May 2001) of work being performed on the double-shell tank farms, and the operation of the aging waste facility (AWF) primary tank ventilation system.

  1. Stability of charged thin-shell wormholes in (2 + 1) dimensions

    E-Print Network [OSTI]

    Ayan Banerjee

    2013-10-20T23:59:59.000Z

    In this paper we construct charged thin-shell wormholes in (2+1)-dimensions applying the cut-and -paste technique implemented by Visser, from a BTZ black hole which was discovered by Banados, Teitelboim and Zanelli, and the surface stress are determined using the Darmois-Israel formalism at the wormhole throat. We analyzed the stability of the shell considering phantom-energy or generalised Chaplygin gas equation of state for the exotic matter at the throat. We also discussed the linearized stability of charged thin-shell wormholes around the static solution.

  2. Stability of Non-asymptotically flat thin-shell wormholes in generalized dilaton-axion gravity

    E-Print Network [OSTI]

    Ayan Banerjee; Farook Rahaman; Surajit Chattopadhyay; Sumita Banerjee

    2013-04-11T23:59:59.000Z

    We construct a new type of thin-shell wormhole for non-asymptotically flat charged black holes in generalized dilaton-axion gravity inspired by low-energy string theory using cut-and-paste technique. We have shown that this thin shell wormhole is stable. The most striking feature of our model is that the total amount of exotic matter needed to support the wormhole can be reduced as desired with the suitable choice of the value of a parameter. Various other aspects of thin-shell wormhole are also analyzed.

  3. Performance requirements for the double-shell tank system: Phase 1

    SciTech Connect (OSTI)

    Claghorn, R.D.

    1998-03-05T23:59:59.000Z

    This document establishes performance requirements for the double-shell tank system. These requirements, in turn, will be incorporated in the System Specification for the Double-Shell Tank System (Grenard and Claghorn 1998). This version of the document establishes requirements that are applicable to the first phase (Phase 1) of the Tank Waste Remediation System (TWRS) mission described in the TWRS Mission Analysis Report (Acree 1998). It does not specify requirements for either the Phase 2 mission or the double-shell tank system closure period.

  4. Dynamic analysis of shells of revolution submerged in an acoustic medium by the finite element method

    E-Print Network [OSTI]

    Ng, Chi Kin

    1978-01-01T23:59:59.000Z

    matrix due to radiated pressure modulus of elasticity linear mid-surface strain for the shell generalized applied load matrix shear modulus generalized radiated pressure matrix assembled equivalent nodal loads due to radiated pressure weight... and the shell material are 0 037 and 0 289 slug per cubic inch, respectively, and the speed of sound in water is taken as 4700 feet per second. This corresponds to a steel shell in sea water. An in ternal pressure of 50 p. s. i. is assumed. The nodal forces...

  5. Robustness of the filamentation instability for asymmetric plasma shells collision in arbitrarily oriented magnetic field

    SciTech Connect (OSTI)

    Bret, A. [ETSI Industriales, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain and Instituto de Investigaciones Energticas y Aplicaciones Industriales, Campus Universitario de Ciudad Real, 13071 Ciudad Real (Spain)] [ETSI Industriales, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain and Instituto de Investigaciones Energticas y Aplicaciones Industriales, Campus Universitario de Ciudad Real, 13071 Ciudad Real (Spain)

    2013-10-15T23:59:59.000Z

    The filamentation instability triggered when two counter streaming plasma shells overlap appears to be the main mechanism by which collisionless shocks are generated. It has been known for long that a flow aligned magnetic field can completely suppress this instability. In a recent paper [Phys. Plasmas 18, 080706 (2011)], it was demonstrated in two dimensions that for the case of two cold, symmetric, relativistically colliding shells, such cancellation cannot occur if the field is not perfectly aligned. Here, this result is extended to the case of two asymmetric shells. The filamentation instability appears therefore as an increasingly robust mechanism to generate shocks.

  6. Temperature and angular momentum dependence of the quadrupole deformation in sd-shell

    E-Print Network [OSTI]

    P. A. Ganai; J. A. Sheikh; I. Maqbool; R. P. Singh

    2009-06-16T23:59:59.000Z

    Temperature and angular momentum dependence of the quadrupole deformation is studied in the middle of the sd-shell for 28Si and 27Si isotopes using the spherical shell model approach. The shell model calculations have been performed using the standard USD interaction and the canonical partition function constructed from the calculated eigen-solutions. It is shown that the extracted average quadrupole moments show a transitional behavior as a function of temperature and the inferred transitional temperature is shown to vary with angular-momentum. The quadrupole deformation of the individual eigen-states is also analyzed.

  7. Scalar Higgs boson production in a fusion of two off-shell gluons

    E-Print Network [OSTI]

    R. S. Pasechnik; O. V. Teryaev; A. Szczurek

    2006-03-30T23:59:59.000Z

    The amplitude for scalar Higgs boson production in a fusion of two off-shell gluons is calculated including finite (not infinite) masses of quarks in the triangle loop. In comparison to the effective Lagrangian approach, we have found a new term in the amplitude. The matrix element found can be used in the kt-factorization approach to the Higgs boson production. The results are compared with the calculations for on-shell gluons. Small deviations from the cos(phi)^2-dependence are predicted. The off-shell effects found are practically negligible.

  8. OVERVIEW OF HANFORD SINGLE SHELL TANK (SST) STRUCTURAL INTEGRITY - 12123

    SciTech Connect (OSTI)

    RAST RS; RINKER MW; WASHENFELDER DJ; JOHNSON JB

    2012-01-25T23:59:59.000Z

    To improve the understanding of the single-shell tanks (SSTs) integrity, Washington River Protection Solutions, LLC (WRPS), the USDOE Hanford Site tank contractor, developed an enhanced Single-Shell Tank Integrity Project in 2009. An expert panel on SST integrity, consisting of various subject matters experts in industry and academia, was created to provide recommendations supporting the development of the project. This panel developed 33 recommendations in four main areas of interest: structural integrity, liner degradation, leak integrity and prevention, and mitigation of contamination migration. Seventeen of these recommendations were used to develop the basis for the M-45-10-1 Change Package for the Hanford Federal Agreement and Compliance Order, which is also known as the Tri-Party Agreement. The structural integrity of the tanks is a key element in completing the cleanup mission at the Hanford Site. There are eight primary recommendations related to the structural integrity of Hanford SSTs. Six recommendations are being implemented through current and planned activities. The structural integrity of the Hanford SSTs is being evaluated through analysis, monitoring, inspection, materials testing, and construction document review. Structural evaluation in the form of analysis is performed using modern finite element models generated in ANSYS{reg_sign} The analyses consider in-situ, thermal, operating loads and natural phenomena such as earthquakes. Structural analysis of 108 of 149 Hanford SSTs has concluded that the tanks are structurally sound and meet current industry standards. Analyses of the remaining Hanford SSTs are scheduled for FY2013. Hanford SSTs are monitored through a dome deflection program. The program looks for deflections of the tank dome greater than 1/4 inch. No such deflections have been recorded. The tanks are also subjected to visual inspection. Digital cameras record the interior surface of the concrete tank domes, looking for cracks and other surface conditions that may indicate signs of structural distress. The condition of the concrete and rebar of the Hanford SSTs is currently being tested and planned for additional activities in the near future. Concrete and rebar removed from the dome of a 65-year-old tank is being tested for mechanics properties and condition. Results indicated stronger than designed concrete with additional Petrographic examination and rebar testing ongoing. Material properties determined from previous efforts combined with current testing and construction document review will help to generate a database that will provide continuing indication of Hanford SST structural integrity.

  9. Tunable synthesis of TiO{sub 2}/SrO core/shell nanowire arrays with enhanced photocatalytic activity

    SciTech Connect (OSTI)

    Wang, Wenqi [Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074 (China)] [Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074 (China); Yang, Jie, E-mail: flyyangj@163.com [Faculty of Mechanical and Electronic Information, China University of Geosciences, Wuhan 430074 (China)] [Faculty of Mechanical and Electronic Information, China University of Geosciences, Wuhan 430074 (China); Gong, Yingpeng, E-mail: ypgong@jhust.edu.cn [School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074 (China)] [School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074 (China); Hong, Hanlie [Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074 (China)] [Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074 (China)

    2013-01-15T23:59:59.000Z

    Graphical abstract: TiO{sub 2} nanowires with tunable SrO shell layer are easily fabricated. The core/shell structure can enhance the photocatalytic activity of TiO{sub 2} nanowires and restrict the recombination of the electrons/holes. Display Omitted Highlights: ? A facile method to fabricate TiO{sub 2}/SrO core-shell nanowire array is reported. ? The thickness of SrO shell layer can be tunable by adjusting the dipping time. ? TiO{sub 2}/SrO core/shell nanowires shows enhanced photocatalytic activity. -- Abstract: We report a simple method to fabricate well-aligned TiO{sub 2}/SrO core/shell nanowire arrays. The core/shell structure is confirmed to have crystalline TiO{sub 2} nanowires core and amorphous SrO shell layer. The shell is composed of SrO with tunable thickness. Photocatalytic activity measurement shows that TiO{sub 2}/SrO core/shell nanowire arrays outperform uncovered TiO{sub 2} nanowires. Such core/shell nanowire arrays have potential applications for photovoltaic devices and as high performance photocatalyst.

  10. Double Shell Tank (DST) Transfer Pump Subsystem Specification

    SciTech Connect (OSTI)

    LESHIKAR, G.A.

    2000-03-27T23:59:59.000Z

    This specification establishes the performance requirements and provides references to the requisite codes and standards to be applied to the Double-Shell Tank (DST) Transfer Pump Subsystem which supports the first phase of Waste Feed Delivery (WFD). This specification establishes the performance requirements and provides the references to the requisite codes and standards to be applied during the design of the DST Transfer Pump Subsystem that supports the first phase of (WFD). The DST Transfer Pump Subsystem consists of a pump for supernatant and or slurry transfer for the DSTs that will be retrieved during the Phase 1 WFD operations. This system is used to transfer low-activity waste (LAW) and high-level waste (HLW) to designated DST staging tanks. It also will deliver blended LAW and HLW feed from these staging tanks to the River Protection Project (RPP) Privatization Contractor facility where it will be processed into an immobilized waste form. This specification is intended to be the basis for new projects/installations (W-521, etc.). This specification is not intended to retroactively affect previously established project design criteria without specific direction by the program.

  11. Refined similarity hypotheses in shell models of turbulence

    E-Print Network [OSTI]

    Emily S. C. Ching; H. Guo; T. S. Lo

    2008-04-16T23:59:59.000Z

    A major challenge in turbulence research is to understand from first principles the origin of anomalous scaling of the velocity fluctuations in high-Reynolds-number turbulent flows. One important idea was proposed by Kolmogorov [J. Fluid Mech. {\\bf 13}, 82 (1962)], which attributes the anomaly to the variations of the locally averaged energy dissipation rate. Kraichnan later pointed out [J. Fluid Mech. {\\bf 62}, 305 (1973)] that the locally averaged energy dissipation rate is not an inertial-range quantity and a proper inertial-range quantity would be the local energy transfer rate. As a result, Kraichnan's idea attributes the anomaly to the variations of the local energy transfer rate. These ideas, generally known as refined similarity hypotheses, can also be extended to study the anomalous scaling of fluctuations of an active scalar, like the temperature in turbulent convection. In this paper, we examine the validity of these refined similarity hypotheses and their extensions to an active scalar in shell models of turbulence. We find that Kraichnan's refined similarity hypothesis and its extension are valid.

  12. Restoration of Secondary Containment in Double Shell Tank (DST) Pits

    SciTech Connect (OSTI)

    SHEN, E.J.

    2000-10-05T23:59:59.000Z

    Cracks found in many of the double-shell tank (DST) pump and valve pits bring into question the ability of the pits to provide secondary containment and remain in compliance with State and Federal regulations. This study was commissioned to identify viable options for maintain/restoring secondary containment capability in these pits. The basis for this study is the decision analysis process which identifies the requirements to be met and the desired goals (decision criteria) that each option will be weighed against. A facilitated workshop was convened with individuals knowledgeable of Tank Farms Operations, engineering practices, and safety/environmental requirements. The outcome of this workshop was the validation or identification of the critical requirements, definition of the current problem, identification and weighting of the desired goals, baselining of the current repair methods, and identification of potential alternate solutions. The workshop was followed up with further investigations into the potential solutions that were identified in the workshop and through other efforts. These solutions are identified in the body of this report. Each of the potential solutions were screened against the list of requirements and only those meeting the requirements were considered viable options. To expand the field of viable options, hybrid concepts that combine the strongest features of different individual approaches were also examined. Several were identified. The decision analysis process then ranked each of the viable options against the weighted decision criteria, which resulted in a recommended solution. The recommended approach is based upon installing a sprayed on coating system.

  13. Double-shell tank ultrasonic inspection plan. Revision 1

    SciTech Connect (OSTI)

    Pfluger, D.C.

    1994-09-30T23:59:59.000Z

    The waste tank systems managed by the Tank Waste Remediation System Division of Westinghouse Hanford Company includes 28 large underground double-shell tanks (DST) used for storing hazardous radioactive waste. The ultrasonic (UT) inspection of these tanks is part of their required integrity assessment (WAC 1993) as described in the tank systems integrity assessment program plan (IAPP) (Pfluger 1994a) submitted to the Ecology Department of the State of Washington. Because these tanks hold radioactive waste and are located underground examinations and inspections must be done remotely from the tank annuli with specially designed equipment. This document describes the UT inspection system (DSTI system), the qualification of the equipment and procedures, field inspection readiness, DST inspections, and post-inspection activities. Although some of the equipment required development, the UT inspection technology itself is the commercially proven and available projection image scanning technique (P-scan). The final design verification of the DSTI system will be a performance test in the Hanford DST annulus mockup that includes the demonstration of detecting and sizing corrosion-induced flaws.

  14. Light-weight-trough type solar concentrator shell

    SciTech Connect (OSTI)

    Severson, A.M.

    1981-01-06T23:59:59.000Z

    A parabolic cylindrical trough solar concentrator shell is disclosed having a pair of oppositely disposed end support members jointed by spanning structural support members which may be in the form of individual elongated generally triangular polygon members to form the parabolic cylindrical trough. The inwardly directed surface of each polygon member is concave in shape and rendered highly reflective and so disposed such that the composite produces a highly reflective, concave, generally parabolic surface which reflects and focusses radiant energy striking upon it along a line parallel to and above the surface of the trough. A radiant energy receiving and absorbing conduit which carries a fluid heat transfer medium is provided along the focal line. The conduit is structurally supported from the end support members in a manner which allows free rotation of the structure relative to the support. In addition to the composite triangular polygon members, the structure may be fabricated using other shapes or a spanning sheet corrugated for strength covered by a separate reflecting surface.

  15. Relativistic outflow from two thermonuclear shell flashes on neutron stars

    E-Print Network [OSTI]

    Zand, Jean in 't; Cavecchi, Yuri

    2014-01-01T23:59:59.000Z

    We study the exceptionally short (32-41 ms) precursors of two intermediate-duration thermonuclear X-ray bursts observed with RXTE from the neutron stars in 4U 0614+09 and 2S 0918-549. They exhibit photon fluxes that surpass those at the Eddington limit later in the burst by factors of 2.6 to 3.1. We are able to explain both the short duration and the super-Eddington flux by mildly relativistic outflow velocities of 0.1$c$ to 0.3$c$ subsequent to the thermonuclear shell flashes on the neutron stars. These are the highest velocities ever measured from any thermonuclear flash. The precursor rise times are also exceptionally short: about 1 ms. This is inconsistent with predictions for nuclear flames spreading laterally as deflagrations and suggests detonations instead. This is the first time that a detonation is suggested for such a shallow ignition column depth ($y_{\\rm ign}$ = 10$^{10}$ g cm$^{-2}$). The detonation would possibly require a faster nuclear reaction chain, such as bypassing the alpha-capture on $^...

  16. The cooling rate of neutron stars after thermonuclear shell flashes

    E-Print Network [OSTI]

    Zand, J J M in 't; Triemstra, T L; Mateijsen, R A D A; Bagnoli, T

    2013-01-01T23:59:59.000Z

    Thermonuclear shell flashes on neutron stars are detected as bright X-ray bursts. Traditionally, their decay is modeled with an exponential function. However, this is not what theory predicts. The expected functional form for luminosities below the Eddington limit, at times when there is no significant nuclear burning, is a power law. We tested the exponential and power-law functional forms against the best data available: bursts measured with the high-throughput Proportional Counter Array (PCA) on board the Rossi X-ray Timing Explorer. We selected a sample of 35 'clean' and ordinary (i.e., shorter than a few minutes) bursts from 14 different neutron stars that 1) show a large dynamic range in luminosity, 2) are the least affected by disturbances by the accretion disk and 3) lack prolonged nuclear burning through the rp-process. We find indeed that for every burst a power law is a better description than an exponential function. We also find that the decay index is steep, 1.8 on average, and different for eve...

  17. Limitations and Opportunities of Off-Shell Coupling Measurements

    E-Print Network [OSTI]

    Christoph Englert; Michael Spannowsky

    2014-08-28T23:59:59.000Z

    Indirect constraints on the total Higgs width $\\Gamma_h$ from correlating Higgs signal strengths with cross section measurements in the off-shell region for $p(g)p(g)\\to 4\\ell$ production have received considerable attention recently, and the CMS collaboration have published a first measurement. We revisit this analysis from a new physics and unitarity constraints perspective and conclude that limits on $\\Gamma_h$ obtained in this fashion are not reliable unless we make model-specific assumptions, which cannot be justified at the current stage of the LHC programme. Relaxing the $\\Gamma_h$ interpretation, we discuss the merits of high invariant mass cross section measurements in the context of Higgs CP analyses, higher dimensional operator testing, and resolved new physics in the light of electroweak precision constraints beyond effective theory limitations. Furthermore, we show that a rather model-independent LHC constraint can be obtained from adapting the $gg\\to 4\\ell$ analysis to the weak boson fusion channels at lower statistical yield.

  18. Recent Developments in No-Core Shell-Model Calculations

    SciTech Connect (OSTI)

    Navratil, P; Quaglioni, S; Stetcu, I; Barrett, B R

    2009-03-20T23:59:59.000Z

    We present an overview of recent results and developments of the no-core shell model (NCSM), an ab initio approach to the nuclear many-body problem for light nuclei. In this aproach, we start from realistic two-nucleon or two- plus three-nucleon interactions. Many-body calculations are performed using a finite harmonic-oscillator (HO) basis. To facilitate convergence for realistic inter-nucleon interactions that generate strong short-range correlations, we derive effective interactions by unitary transformations that are tailored to the HO basis truncation. For soft realistic interactions this might not be necessary. If that is the case, the NCSM calculations are variational. In either case, the ab initio NCSM preserves translational invariance of the nuclear many-body problem. In this review, we, in particular, highlight results obtained with the chiral two- plus three-nucleon interactions. We discuss efforts to extend the applicability of the NCSM to heavier nuclei and larger model spaces using importance-truncation schemes and/or use of effective interactions with a core. We outline an extension of the ab initio NCSM to the description of nuclear reactions by the resonating group method technique. A future direction of the approach, the ab initio NCSM with continuum, which will provide a complete description of nuclei as open systems with coupling of bound and continuum states is given in the concluding part of the review.

  19. Ultrasound Characterization of Mechanical Properties of Nanometric Contrast Agents with PLGA Shell in

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ) [5] in order to make it stealth to macrophages. For such materials, the ratio of of the (biocompatible) material for the particle shell is essential. The accumulation can be en- hanced by decorating

  20. CONSTRUCTION METHOD STUDY FOR INSTALLATION OF A LARGE RISER IN A SINGLE-SHELL TANK

    SciTech Connect (OSTI)

    ADKISSON DA

    2010-08-04T23:59:59.000Z

    This study evaluates and identifies a construction method for cutting a hole in a single-shell tank dome. This study also identifies and evaluates vendors for performing the cut.

  1. Semiclassical shell-structure moment of inertia within the phase-space approach

    E-Print Network [OSTI]

    D. V. Gorpinchenko; A. G. Magner; J. Bartel; J. P. Blocki

    2014-11-23T23:59:59.000Z

    The moment of inertia for nuclear collective rotations was derived within the semiclassical approach based on the cranking model and the Strutinsky shell-correction method by using the non-perturbative periodic-orbit theory in the phase space variables. This moment of inertia for adiabatic (statistical-equilibrium) rotations can be approximated by the generalized rigid-body moment of inertia accounting for the shell corrections of the particle density. A semiclassical phase-space trace formula allows to express quite accurately the shell components of the moment of inertia in terms of the free-energy shell corrections for integrable and partially chaotic Fermi systems, in good agreement with the quantum calculations.

  2. Long-Range Validity of Threshold Laws in Inner-Shell Photodetachment

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

    the ALS, and Denison University has now shown that the threshold laws for inner-shell photodetachment of negative ions are not only obeyed but can extend over a much...

  3. Excitation energies and Stokes shifts from a restricted open-shell Kohn-Sham approach

    E-Print Network [OSTI]

    Kowalczyk, Tim

    Restricted open-shell Kohn-Sham (ROKS) theory provides a powerful computational tool for calculating singlet excited state energies and dynamics. However, the possibility of multiple solutions to the ROKS equations with ...

  4. CONSTRUCTION METHOD STUDY FOR INSTALLATION OF A LARGE RISER IN A SINGLE SHELL TANK

    SciTech Connect (OSTI)

    PICKETT W; ADKISSON DA

    2009-07-22T23:59:59.000Z

    This study evaluates and identifies a construction method for cutting a hole in a single-shell tank dome. This study also identifies and evaluates vendors for performing the cut.

  5. Microsoft Word - Little Shell Final Draft CX 7-15-2013

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

    Little Shell Property funding Fish and Wildlife Project No. and Contract No.: 2002-003-00, BPA-007168 Categorical Exclusion Applied (from Subpart D, 10 C.F.R. Part 1021): B1.25...

  6. Application to Export Electric Energy OE Doc No. EA-339-A Shell...

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

    : Federal Register Notice, Volume 78, No. 45 - March 7, 2013 Application to Export Electric Energy OE Doc No. EA-339-A Shell Energy North America (US), L.P.: Federal Register...

  7. Preventing Buoyant Displacement Gas Release Events in Hanford Double-Shell Waste Tanks

    SciTech Connect (OSTI)

    Meyer, Perry A.; Stewart, Charles W.

    2001-01-01T23:59:59.000Z

    This report summarizes the predictive methods used to ensure that waste transfer operations in Hanford waste tanks do not create waste configurations that lead to unsafe gas release events. The gas release behavior of the waste in existing double-shell tanks has been well characterized, and the flammable gas safety issues associated with safe storage of waste in the current configuration are being formally resolved. However, waste is also being transferred between double-shell tanks and from single-shell tanks into double-shell tanks by saltwell pumping and sluicing that create new wastes and waste configurations that have not been studied as well. Additionally, planning is underway for various waste transfer scenarios to support waste feed delivery to the proposed vitrification plant. It is critical that such waste transfers do not create waste conditions with the potential for dangerous gas release events.

  8. Optimization of Passive Constrained Layer Damping Treatments for Vibration Control of Cylindrical Shells

    E-Print Network [OSTI]

    Zheng, H.

    This paper presents the layout optimization of passive constrained layer damping (PCLD) treatment for vibration control of cylindrical shells under a broadband force excitation. The equations governing the vibration responses ...

  9. Portland cement mortar modified with latex and fiber glass for thin shell construction

    E-Print Network [OSTI]

    Raymond, Jewell Duane

    1963-01-01T23:59:59.000Z

    and materials required for the elaborate formwork. Building codes are also in need of revision to include provisions for thin shell construction. The objective of this study was to investigate the possible potential use of portland cement mortar modified...

  10. Determination of monolayer-protected gold nanoparticle ligandshell morphology using NMR

    E-Print Network [OSTI]

    Liu, Xiang

    It is accepted that the ligand shell morphology of nanoparticles coated with a monolayer of molecules can be partly responsible for important properties such as cell membrane penetration and wetting. When binary mixtures ...

  11. Off-Shell Scattering Amplitudes for WW Scattering and the Role of the Photon Pole

    E-Print Network [OSTI]

    J. Bartels; F. Schwennsen

    2005-06-06T23:59:59.000Z

    We derive analytic expressions for high energy $2 \\to 2$ off-shell scattering amplitudes of weak vector bosons. They are obtained from six fermion final states in processes of the type $e^+ e^- \\to \\bar\

  12. Core-Shell Diamond as a Support for Solid-Phase Extraction and...

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

    a Support for Solid-Phase Extraction and High-Performance Liquid Chromatography. Core-Shell Diamond as a Support for Solid-Phase Extraction and High-Performance Liquid...

  13. Electromagnetic Casimir densities for a wedge with a coaxial cylindrical shell

    E-Print Network [OSTI]

    A. A. Saharian

    2007-04-15T23:59:59.000Z

    Vacuum expectation values of the field square and the energy-momentum tensor for the electromagnetic field are investigated for the geometry of a wedge with a coaxal cylindrical boundary. All boundaries are assumed to be perfectly conducting and both regions inside and outside the shell are considered. By using the generalized Abel-Plana formula, the vacuum expectation values are presented in the form of the sum of two terms. The first one corresponds to the geometry of the wedge without the cylindrical shell and the second term is induced by the presence of the shell. The vacuum energy density induced by the shell is negative for the interior region and is positive for the exterior region. The asymptotic behavior of the vacuum expectation values are investigated in various limiting cases. It is shown that the vacuum forces acting on the wedge sides due to the presence of the cylindrical boundary are always attractive.

  14. The Shell Model, the Renormalization Group and the Two-Body Interaction

    E-Print Network [OSTI]

    B. K. Jennings

    2005-04-25T23:59:59.000Z

    The no-core shell model and the effective interaction $V_{{\\rm low} k}$ can both be derived using the Lee-Suzuki projection operator formalism. The main difference between the two is the choice of basis states that define the model space. The effective interaction $V_{{\\rm low} k}$ can also be derived using the renormalization group. That renormalization group derivation can be extended in a straight forward manner to also include the no-core shell model. In the nuclear matter limit the no-core shell model effective interaction in the two-body approximation reduces identically to $V_{{\\rm low} k}$. The same considerations apply to the Bloch-Horowitz version of the shell model and the renormalization group treatment of two-body scattering by Birse, McGovern and Richardson.

  15. Characterization of Post-mortem Shell Alteration in Aransas Bay, Texas

    E-Print Network [OSTI]

    Schirm, David Edward

    2013-06-04T23:59:59.000Z

    Accumulations of dead shells in both modern coastal settings and in the rock record contain valuable information on past ecosystems and environmental conditions. However, death assemblages are not simply snapshots of living communities; rather...

  16. Feedback stabilization of resistive shell modes in a reversed field pinch

    SciTech Connect (OSTI)

    Fitzpatrick, R.; Yu, E.P. [Institute for Fusion Studies, Department of Physics, University of Texas at Austin, Austin, Texas 78712-1060 (United States)] [Institute for Fusion Studies, Department of Physics, University of Texas at Austin, Austin, Texas 78712-1060 (United States)

    1999-09-01T23:59:59.000Z

    A reactor relevant reversed field pinch (RFP) must be capable of operating successfully when surrounded by a close-fitting resistive shell whose L/R time is much {ital shorter} than the pulse length. Resonant modes are largely unaffected by the shell resistivity, provided that the plasma rotation is maintained against the breaking effect of nonaxisymmetric eddy currents induced in the shell. This may require an auxiliary momentum source, such as a neutral beam injector. Nonresonant modes are largely unaffected by plasma rotation, and are expected to manifest themselves as nonrotating {ital resistive shell modes} growing on the L/R time of the shell. A general RFP equilibrium is subject to many simultaneously unstable resistive shell modes; the only viable control mechanism for such modes in a RFP reactor is {ital active feedback}. It is demonstrated than an {ital N}-fold toroidally symmetric arrangement of feedback coils, combined with a strictly linear feedback algorithm, is capable of {ital simultaneously stabilizing} all intrinsically unstable resistive shell modes over a wide range of different RFP equilibria. The number of coils in the toroidal direction {ital N}, at any given poloidal angle, must be greater than, or equal to, the range of toroidal mode numbers of the unstable resistive shell modes. However, this range is largely determined by the aspect-ratio of the device. The optimum coil configuration corresponds to one in which each feedback coil slightly overlaps its immediate neighbors in the toroidal direction. The critical current which must be driven around each feedback coils is, at most, a few percent of the equilibrium toroidal plasma current. The feedback scheme is robust to small deviations from pure {ital N}-fold toroidal symmetry or a pure linear response of the feedback circuits. {copyright} {ital 1999 American Institute of Physics.}

  17. A comparison of selected quality and compositional characteristics of brown and white shell eggs

    E-Print Network [OSTI]

    Curtis, Patricia Ann

    1982-01-01T23:59:59.000Z

    for the degree of MASTER OF SCIENCE December 1982 Major Subject: Food Science and Tecnnology A COMPARISON OF SELECTED QUALITI AND COMPOSITIONAL CHARACTERISITICS OF HROWN AND WHITE SHELL EGGS A Thesis by PATRICIA ANN CURTIS Approved as to style... and cortent by: (Chairman of Committee) (Department ead) (Member) -'(, ( ember) ip (Member) December 1982 ABSTRACT A Comparison of Selected Quality and Compositional Characteristics of Brown and White Shell Eggs (December 1982) Patricia Ann Curtis...

  18. Measurement of an Explosively Driven Hemispherical Shell Using 96 Points of Optical Velocimetry

    SciTech Connect (OSTI)

    Danielson, J. R. [LANL; Daykin, E P [NSTec; Diaz, A. B. [NSTec; Doty, D. L. [LANL; Frogget, B. C. [NSTec; Furlanetto, M. R. [LANL; Gallegos, C. H. [NSTec; Gibo, M [NSTec; Garza, A [NSTec; Holtkamp, D B [LANL; Hutchins, M S [NSTec; Perez, C [NSTec; Perez, C [NSTec; Pena, M [NSTec; Romero, V T [NSTec; Shinas, M A [LANL; Teel, M G [NSTec; Tabaka, L J [LANL

    2014-04-01T23:59:59.000Z

    We report the measurement of the surface motion of a hemispherical copper shell driven by high explosives. This measurement was made using three 32-channel multiplexed photonic Doppler velocimetry (PDV) systems, in combination with a novel compound optical probe. Clearly visible are detailed features of the motion of the shell over time, enhanced by spatial correlation. Significant non-normal motion is apparent, and challenges in measuring such a geometry are discussed.

  19. The effect of various calcium and phosphorus levels on egg production and egg shell quality

    E-Print Network [OSTI]

    Bradley, John Warren

    1980-01-01T23:59:59.000Z

    . ) (Pleiahc~) Angust 1980 ABSTRACT The Effect of Various Calcium and Phosphorus Levels on Egg Production and Egg Shell Quality. (August 1980) John Warren Bradley, Junior B. S. , Texas A&M University Chairman of Advisory Committee: Dr. C. R. Creger Two... experiments were conducted, using a commercial strain of White Leghorn laying hens, to determine the effect of feeding various dietary combinations of calcium and phosphorus on egg production and egg shell quality. Calcium carbonate in the form of oyster...

  20. Recursion relations for two-loop self-energy diagrams on-shell

    E-Print Network [OSTI]

    J. Fleischer; M. Yu. Kalmykov; A. V. Kotikov

    1999-05-18T23:59:59.000Z

    A set of recurrence relations for on-shell two-loop self-energy diagrams with one mass is presented, which allows to reduce the diagrams with arbitrary indices (powers of scalar propagators) to a set of the master integrals. The SHELL2 package is used for the calculation of special types of diagrams. A method of calculation of higher order \\epsilon-expansion of master integrals is demonstrated.

  1. Shell theories arising as low energy ?-limit of 3d nonlinear elasticity

    E-Print Network [OSTI]

    Marta Lewicka; Maria Giovanna Mora; Mohammad Reza Pakzad

    2008-03-04T23:59:59.000Z

    We discuss the limiting behavior (using the notion of \\Gamma-limit) of the 3d nonlinear elasticity for thin shells around an arbitrary smooth 2d surface. In particular, under the assumption that the elastic energy of deformations scales like h^4 (where h is the thickness of a shell), we derive a limiting theory which is a generalization of the von K\\'arm\\'an theory for plates.

  2. Shell model nuclear matrix elements for competing mechanisms contributing to double beta decay

    SciTech Connect (OSTI)

    Horoi, Mihai [Department of Physics, Central Michigan University, Mount Pleasant, Michigan, 48859 (United States)

    2013-12-30T23:59:59.000Z

    Recent progress in the shell model approach to the nuclear matrix elements for the double beta decay process are presented. This includes nuclear matrix elements for competing mechanisms to neutrionless double beta decay, a comparison between closure and non-closure approximation for {sup 48}Ca, and an updated shell model analysis of nuclear matrix elements for the double beta decay of {sup 136}Xe.

  3. Features of the electronic spectrum in a type-I core - shell quantum dot

    SciTech Connect (OSTI)

    Igoshina, S E; Karmanov, A A [Penza State University, Penza (Russian Federation)

    2013-01-31T23:59:59.000Z

    The model is proposed, which allows one to solve the problem of finding the energy spectrum and the wave function of an electron in a type-I core - shell quantum dot. It is shown that the size of the core and shell can serve as control parameters for the optimisation of the energy structure of the quantum dot in order to obtain the real structures with desired electrophysical and optical properties. (quantum dots)

  4. Casimir energy for self-interacting scalar field in a spherical shell

    E-Print Network [OSTI]

    M. R. Setare; R. Mansouri

    2002-01-27T23:59:59.000Z

    In this paper we calculate the Casimir energy for spherical shell with massless self-interacting scalar filed which satisfying Dirichlet boundary conditions on the shell. Using zeta function regularization and heat kernel coefficients we obtain the divergent contributions inside and outside of Casimir energy. The effect of self-interacting term is similar with existing of mass for filed. In this case some divergent part arises. Using the renormalization procedure of bag model we can cancel these divergent parts.

  5. Utilization of flange design and vessel shell properties to eliminate use of metallic expansion joints

    SciTech Connect (OSTI)

    Mitchell, D.W.

    1982-01-01T23:59:59.000Z

    This paper presents the techniques that were utilized to verify that expansion joints could be eliminated from the critical 20 inch Raw Gas Cooler piping from the Gasifiers in a coal gasification project. It details the parameters that were considered in the analysis showing particular attention to determining shell flexibilites and preventing flange leakages. The expansion joints were unnecessary, with much of the credit coming from the flexibility in the shell and by proper selection of gasket material.

  6. Modifying yolk fatty acid composition to improve the health quality of shell eggs

    E-Print Network [OSTI]

    Van Elswyk, Mary Elizabeth

    2012-06-07T23:59:59.000Z

    MODIFYING YOLK FATTY ACID COMPOSITION TO IMPROVE THE HEALTH QUALITY OF SHELL EGGS A Thesis by MARY ELIZABETH VAN ELSWYK 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 August 1990 Major Subject: Nutrition MODIFYING YOLK FATTY ACID COMPOSITION TO IMPROVE THE HEALTH QUALITY OF SHELL EGGS A Thesis by MARY ELIZABETH VAN ELSWYK Approved as to style and content by: Pamela S. Har s (Chair...

  7. Unique Challenges Accompany Thick-Shell CdSe/nCdS (n > 10) Nanocrystal Synthesis

    SciTech Connect (OSTI)

    Guo, Y; Marchuk, K; Abraham, R; Sampat, S; Abraham, R.; Fang, N; Malko, AV; Vela, J

    2011-12-23T23:59:59.000Z

    Thick-shell CdSe/nCdS (n {ge} 10) nanocrystals were recently reported that show remarkably suppressed fluorescence intermittency or 'blinking' at the single-particle level as well as slow rates of Auger decay. Unfortunately, whereas CdSe/nCdS nanocrystal synthesis is well-developed up to n {le} 6 CdS monolayers (MLs), reproducible syntheses for n {ge} 10 MLs are less understood. Known procedures sometimes result in homogeneous CdS nucleation instead of heterogeneous, epitaxial CdS nucleation on CdSe, leading to broad and multimodal particle size distributions. Critically, obtained core/shell sizes are often below those desired. This article describes synthetic conditions specific to thick-shell growth (n {ge} 10 and n {ge} 20 MLs) on both small (sub2 nm) and large (>4.5 nm) CdSe cores. We find added secondary amine and low concentration of CdSe cores and molecular precursors give desired core/shell sizes. Amine-induced, partial etching of CdSe cores results in apparent shell-thicknesses slightly beyond those desired, especially for very-thick shells (n {ge} 20 MLs). Thermal ripening and fast precursor injection lead to undesired homogeneous CdS nucleation and incomplete shell growth. Core/shells derived from small CdSe (1.9 nm) have longer PL lifetimes and more pronounced blinking at single-particle level compared with those derived from large CdSe (4.7 nm). We expect our new synthetic approach will lead to a larger throughput of these materials, increasing their availability for fundamental studies and applications.

  8. Thin shell wormhole due to dyadosphere of a charged black hole

    E-Print Network [OSTI]

    F. Rahaman; M. Kalam; K A Rahman

    2008-06-09T23:59:59.000Z

    To explain Gamma Ray Bursts, Ruffini argued that the event horizon of a charged black hole is surrounded by a special region called, the Dyadosphere where electric field exceeds the critical value for $e^+$ $e^-$ pair production. In the present work, we construct a thin shell wormhole by performing a thought surgery between two dadospheres. Several physical properties of this thin shell wormhole have been analyzed.

  9. A Yolk-Shell Design for Stabilized and Scalable Li-Ion Battery Alloy Anodes

    SciTech Connect (OSTI)

    Liu, Nian; Wu, Hui; Mcdowell, Matthew T.; Yao, Yan; Wang, Chong M.; Cui, Yi

    2012-05-02T23:59:59.000Z

    Silicon is regarded as one of the most promising anode materials for next generation lithium-ion batteries. For use in practical applications, a Si electrode must have high capacity, long cycle life, high efficiency, and the fabrication must be industrially scalable. Here, we design and fabricate a yolk-shell structure to meet all these needs. The fabrication is carried out without special equipment and mostly at room temperature. Commercially available Si nanoparticles are completely sealed inside conformal, thin, self-supporting carbon shells, with rationally designed void space in between the particles and the shell. The well-defined void space allows the Si particles to expand freely without breaking the outer carbon shell, therefore stabilizing the solid-electrolyte interphase on the shell surface. High capacity (?2800 mAh/g at C/10), long cycle life (1000 cycles with 74% capacity retention), and high Coulombic efficiency (99.84%) have been realized in this yolk-shell structured Si electrode.

  10. Bandgap Engineering of InP QDs Through Shell Thickness and Composition

    SciTech Connect (OSTI)

    Dennis, Allison M. [Los Alamos National Laboratory; Mangum, Benjamin D. [Los Alamos National Laboratory; Piryatinski, Andrei [Los Alamos National Laboratory; Park, Young-Shin [Los Alamos National Laboratory; Htoon, Han [Los Alamos National Laboratory; Hollingsworth, Jennifer A. [Los Alamos National Laboratory

    2012-06-21T23:59:59.000Z

    Fields as diverse as biological imaging and telecommunications utilize the unique photophysical and electronic properties of nanocrystal quantum dots (NQDs). The development of new NQD compositions promises material properties optimized for specific applications, while addressing material toxicity. Indium phosphide (InP) offers a 'green' alternative to the traditional cadmium-based NQDs, but suffers from extreme susceptibility to oxidation. Coating InP cores with more stable shell materials significantly improves nanocrystal resistance to oxidation and photostability. We have investigated several new InP-based core-shell compositions, correlating our results with theoretical predictions of their optical and electronic properties. Specifically, we can tailor the InP core-shell QDs to a type-I, quasi-type-II, or type-II bandgap structure with emission wavelengths ranging from 500-1300 nm depending on the shell material used (ZnS, ZnSe, CdS, or CdSe) and the thickness of the shell. Single molecule microscopy assessments of photobleaching and blinking are used to correlate NQD properties with shell thickness.

  11. Inner-shell radiation from wire array implosions on the Zebra generator

    SciTech Connect (OSTI)

    Ouart, N. D.; Giuliani, J. L.; Dasgupta, A. [Plasma Physics Division, Naval Research Laboratory, Washington, District of Columbia 20375 (United States)] [Plasma Physics Division, Naval Research Laboratory, Washington, District of Columbia 20375 (United States); Safronova, A. S.; Kantsyrev, V. L.; Esaulov, A. A.; Shrestha, I.; Weller, M. E.; Shlyaptseva, V.; Osborne, G. C.; Stafford, A.; Keim, S. [Physics Department, University of Nevada, Reno, Nevada 89557 (United States)] [Physics Department, University of Nevada, Reno, Nevada 89557 (United States); Apruzese, J. P. [Consultant to NRL through Engility Corp., Chantilly, Virginia 20151 (United States)] [Consultant to NRL through Engility Corp., Chantilly, Virginia 20151 (United States); Clark, R. W. [Berkeley Research Associates, Beltsville, Maryland 20705 (United States)] [Berkeley Research Associates, Beltsville, Maryland 20705 (United States)

    2014-03-15T23:59:59.000Z

    Implosions of brass wire arrays on Zebra have produced L-shell radiation as well as inner-shell K? and K? transitions. The L-shell radiation comes from ionization stages around the Ne-like charge state that is largely populated by a thermal electron energy distribution function, while the K-shell photons are a result of high-energy electrons ionizing or exciting an inner-shell (1s) electron from ionization stages around Ne-like. The K- and L-shell radiations were captured using two time-gated and two axially resolved time-integrated spectrometers. The electron beam was measured using a Faraday cup. A multi-zone non-local thermodynamic equilibrium pinch model with radiation transport is used to model the x-ray emission from experiments for the purpose of obtaining plasma conditions. These plasma conditions are used to discuss some properties of the electron beam generated by runaway electrons. A simple model for runaway electrons is examined to produce the K? radiation, but it is found to be insufficient.

  12. Spectroscopy of $^{28}$Na: shell evolution toward the drip line

    E-Print Network [OSTI]

    A. Lepailleur; K. Wimmer; A. Mutschler; O. Sorlin; V. Bader; C. Bancroft; D. Barofsky; B. Bastin; T. Baugher; D. Bazin; V. Bildstein; C. Borcea; R. Borcea; B. A. Brown; L. Caceres; A. Gade; L. Gaudefroy; S. Grvy; G. F. Grinyer; H. Iwasaki; E. Khan; T. Krll; C. Langer; A. Lemasson; O. Llidoo; J. Lloyd; F. Negoita; F. de Oliveira Santos; G. Perdikakis; F. Recchia; T. Redpath; T. Roger; F. Rotaru; S. Saenz; M. -G. Saint-Laurent; D. Smalley; D. Sohler; M. Stanoiu; S. R. Stroberg; J. C. Thomas; M. Vandebrouck; D. Weisshaar; A. Westerberg

    2015-03-30T23:59:59.000Z

    Excited states in $^{28}$Na have been studied using the $\\beta$-decay of implanted $^{28}$Ne ions at GANIL/LISE as well as the in-beam $\\gamma$-ray spectroscopy at the NSCL/S800 facility. New states of positive (J$^{\\pi}$=3,4$^+$) and negative (J$^{\\pi}$=1-5$^-$) parity are proposed. The former arise from the coupling between 0d$\\_{5/2}$ protons and a 0d$\\_{3/2}$ neutron, while the latter are due to couplings with 1p$\\_{3/2}$ or 0f$\\_{7/2}$ neutrons. While the relative energies between the J$^{\\pi}$=1-4$^+$ states are well reproduced with the USDA interaction in the N=17 isotones, a progressive shift in the ground state binding energy (by about 500 keV) is observed between $^{26}$F and $^{30}$Al. This points to a possible change in the proton-neutron 0d$\\_{5/2}$-0d$\\_{3/2}$ effective interaction when moving from stability to the drip line. The presence of J$^{\\pi}$=1-4$^-$ negative parity states around 1.5 MeV as well as of a candidate for a J$^{\\pi}$=5$^-$ state around 2.5 MeV give further support to the collapse of the N=20 gap and to the inversion between the 0f$\\_{7/2}$ and 1p$\\_{3/2}$ levels below Z=12. These features are discussed in the framework of Shell Model and EDF calculations, leading to predicted negative parity states in the low energy spectra of the $^{26}$F and $^{25}$O nuclei.

  13. Single-shell tank closure work plan. Revision A

    SciTech Connect (OSTI)

    NONE

    1995-06-01T23:59:59.000Z

    In January 1994, the Hanford Federal Facility Agreement and Conset Order (Tri-Party Agreement) was amended to reflect a revised strategy for remediation of radioactive waste in underground storage tanks. These amendments include milestones for closure of the single-shell tank (SST) operable units, to be initiated by March 2012 and completed by September 2024. This SST-CWP has been prepared to address the principal topical areas identified in Tri-Party Agreement Milestone M-45-06 (i.e., regulatory pathway, operable unit characterization, waste retrieval, technology development, and a strategy for achieving closure). Chapter 2.0 of this SST-CWP provides a brief description of the environmental setting, SST System, the origin and characteristics of SST waste, and ancillary equipment that will be remediated as part of SST operable unit closure. Appendix 2A provides a description of the hydrogeology of the Hanford Site, including information on the unsaturated sediments (vadose zone) beneath the 200 Areas Plateau. Chapter 3.0 provides a discussion of the laws and regulations applicable to closure of the SST farm operable units. Chapter 4.0 provides a summary description of the ongoing characterization activities that best align with the proposed regulatory pathway for closure. Chapter 5.0 describes aspects of the SST waste retrieval program, including retrieval strategy, technology, and sequence, potential tank leakage during retrieval, and considerations of deployment of subsurface barriers. Chapter 6.0 outlines a proposed strategy for closure. Chapter 7.0 provides a summary of the programs underway or planned to develop technologies to support closure. Ca. 325 refs.

  14. Spin-dependent localized Hartree-Fock density-functional approach for the accurate treatment of inner-shell excitation of closed-shell atoms

    E-Print Network [OSTI]

    Chu, Shih-I; Zhou, Zhongyuan

    2007-01-17T23:59:59.000Z

    A spin-dependent localized Hartree-Fock density-functional approach is presented for the efficient and accurate treatment of inner-shell excited states of atomic systems. The approach is applied to the calculation of the total and excitation...

  15. Accepted for publication in the IEEE Trans. on Fuzzy Systems. FuzzyShell: A LargeScale Expert System Shell using

    E-Print Network [OSTI]

    Kak, Avinash

    as evidence becomes available for some others. While the use of fuzzy logic for control has mushroomed over System Shell using Fuzzy Logic for Uncertainty Reasoning \\Lambda y Juiyao Pan, Guilherme N. De that is particularly suitable for reasoning with fuzzy logic. The generalized Rete network consists of a cascade

  16. Compressed shell conditions extracted from spectroscopic analysis of Ti K-shell absorption spectra with evaluation of line self-emission

    SciTech Connect (OSTI)

    Johns, H. M.; Mancini, R. C.; Hakel, P.; Nagayama, T. [Physics Department, University of Nevada, Reno, 1664 N. Virginia St., Reno, Nevada 89557 (United States); Smalyuk, V. A.; Regan, S. P.; Delettrez, J. [Laboratory for Laser Energetics, University of Rochester, 250 E. River Road, Rochester, New York 14623 (United States)

    2014-08-15T23:59:59.000Z

    Ti-doped tracer layers embedded in the shell at varying distances from the fuel-shell interface serve as a spectroscopic diagnostic for direct-drive experiments conducted at OMEGA. Detailed modeling of Ti K-shell absorption spectra produced in the tracer layer considers n?=?12 transitions in F- through Li-like Ti ions in the 44004800?eV range, both including and excluding line self-emission. Testing the model on synthetic spectra generated from 1-D LILAC hydrodynamic simulations reveals that the model including self-emission best reproduces the simulation, while the model excluding self-emission overestimates electron temperature T{sub e} and density N{sub e} to a higher degree for layers closer to the core. The prediction of the simulation that the magnitude of T{sub e} and duration of Ti absorption will be strongly tied to the distance of the layer from the core is consistent with the idea that regions of the shell close to the core are more significantly heated by thermal transport out of the hot dense core, but more distant regions are less affected by it. The simulation predicts more time variation in the observed T{sub e}, N{sub e} conditions in the compressed shell than is observed in the experiment, analysis of which reveals conditions remain in the range T{sub e}?=?400600?eV and N{sub e}?=?3.010.0??10{sup 24} cm{sup ?3} for all but the most distant Ti-doped layer, with error bars ?5% T{sub e} value and ?10% N{sub e} on average. The T{sub e}, N{sub e} conditions of the simulation lead to a greater degree of ionization for zones close to the core than occurs experimentally, and less ionization for zones far from the core.

  17. Process-Dependent Properties in Colloidally Synthesized Giant Core/Shell Nanocrystal Quantum Dots

    SciTech Connect (OSTI)

    Hollingsworth, Jennifer A. [Los Alamos National Laboratory; Ghosh, Yagnaseni [Los Alamos National Laboratory; Dennis, Allison M. [Los Alamos National Laboratory; Mangum, Benjamin D. [Los Alamos National Laboratory; Park, Young-Shin [Los Alamos National Laboratory; Kundu, Janardan [Los Alamos National Laboratory; Htoon, Han [Los Alamos National Laboratory

    2012-06-07T23:59:59.000Z

    Due to their characteristic bright and stable photoluminescence, semiconductor nanocrystal quantum dots (NQDs) have attracted much interest as efficient light emitters for applications from single-particle tracking to solid-state lighting. Despite their numerous enabling traits, however, NQD optical properties are frustratingly sensitive to their chemical environment, exhibit fluorescence intermittency ('blinking'), and are susceptible to Auger recombination, an efficient nonradiative decay process. Previously, we showed for the first time that colloidal CdSe/CdS core/shell nanocrystal quantum dots (NQDs) comprising ultrathick shells (number of shell monolayers, n, > 10) grown by protracted successive ionic layer adsorption and reaction (SILAR) leads to remarkable photostability and significantly suppressed blinking behavior as a function of increasing shell thickness. We have also shown that these so-called 'giant' NQDs (g-NQDs) afford nearly complete suppression of non-radiative Auger recombination, revealed in our studies as long biexciton lifetimes and efficient multiexciton emission. The unique behavior of this core/shell system prompted us to assess correlations between specific physicochemical properties - beyond shell thickness - and functionality. Here, we demonstrate the ability of particle shape/faceting, crystalline phase, and core size to determine ensemble and single-particle optical properties (quantum yield/brightness, blinking, radiative lifetimes). Significantly, we show how reaction process parameters (surface-stabilizing ligands, ligand:NQD ratio, choice of 'inert' solvent, and modifications to the SILAR method itself) can be tuned to modify these function-dictating NQD physical properties, ultimately leading to an optimized synthetic approach that results in the complete suppression of blinking. We find that the resulting 'guiding principles' can be applied to other NQD compositions, allowing us to achieve non-blinking behavior in the near-infrared. Lastly, in addition to realizing novel light-emission properties by refining nanoscale architectures at the single-NQD level, we also investigate collective properties by assembling our core/shell NQDs into larger scale arrays.

  18. Scalar Casimir densities induced by a cylindrical shell in de Sitter spacetime

    E-Print Network [OSTI]

    A. A. Saharian; V. F. Manukyan

    2014-04-27T23:59:59.000Z

    We evaluate the positive-frequency Wightman function, the vacuum expectation values (VEVs) of the field squared and the energy-momentum tensor for a massive scalar field with general curvature coupling for a cylindrical shell in background of dS spacetime. The field is prepared in the Bunch-Davies vacuum state and on the shell the corresponding operator obeys Robin boundary condition. In the region inside the shell and for non-Neumann boundary conditions, the Bunch-Davies vacuum is a physically realizable state for all values of the mass and curvature coupling parameter. For both interior and exterior regions, the VEVs are decomposed into boundary-free dS and shell-induced parts. We show that the shell-induced part of the vacuum energy-momentum tensor has a nonzero off-diagonal component corresponding to the energy flux along the radial direction. Unlike to the case of a shell in Minkowski bulk, for dS background the axial stresses are not equal to the energy density. In dependence of the mass and of the coefficient in the boundary condition, the vacuum energy density and the energy flux can be either positive or negative. The influence of the background gravitational field on the boundary-induced effects is crucial at distances from the shell larger than the dS curvature scale. In particular, the decay of the VEVs with the distance is power-law (monotonic or oscillatory with dependence of the mass) for both massless and massive fields. For Neumann boundary condition the decay is faster than that for non-Neumann conditions.

  19. Neutron shell structure and deformation in neutron-drip-line nuclei

    E-Print Network [OSTI]

    Ikuko Hamamoto

    2012-06-18T23:59:59.000Z

    Neutron shell-structure and the resulting possible deformation in the neighborhood of neutron-drip-line nuclei are systematically discussed, based on both bound and resonant neutron one-particle energies obtained from spherical and deformed Woods-Saxon potentials. Due to the unique behavior of weakly-bound and resonant neutron one-particle levels with smaller orbital angular-momenta $\\ell$, a systematic change of the shell structure and thereby the change of neutron magic-numbers are pointed out, compared with those of stable nuclei expected from the conventional j-j shell-model. For spherical shape with the operator of the spin-orbit potential conventionally used, the $\\ell_{j}$ levels belonging to a given oscillator major shell with parallel spin- and orbital-angular-momenta tend to gather together in the energetically lower half of the major shell, while those levels with anti-parallel spin- and orbital-angular-momenta gather in the upper half. The tendency leads to a unique shell structure and possible deformation when neutrons start to occupy the orbits in the lower half of the major shell. Among others, the neutron magic-number N=28 disappears and N=50 may disappear, while the magic number N=82 may presumably survive due to the large $\\ell =5$ spin-orbit splitting for the $1h_{11/2}$ orbit. On the other hand, an appreciable amount of energy gap may appear at N=16 and 40 for spherical shape, while neutron-drip-line nuclei in the region of neutron number above N=20, 40 and 82, namely N $\\approx$ 21-28, N $\\approx$ 41-54, and N $\\approx$ 83-90, may be quadrupole-deformed though the possible deformation depends also on the proton number of respective nuclei.

  20. Nucleus-nucleus potential with shell-correction contribution and deep sub-barrier fusion of heavy nuclei

    E-Print Network [OSTI]

    V. Yu. Denisov

    2014-04-04T23:59:59.000Z

    It is suggested that the full nucleus-nucleus potential consists of the macroscopic and shell-correction parts. The deep sub-barrier fusion hindrance takes place in a nucleus-nucleus system with a strong negative shell-correction contribution to the full heavy-ion potential, while a strong positive shell-correction contribution to the full potential leads to weak enhancement of the deep sub-barrier fusion cross section.

  1. First Observations of Nonhydrodynamic Mix at the Fuel-Shell Interface in Shock-Driven Inertial Confinement Implosions

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

    Rinderknecht, H. G.; Sio, H.; Li, C. K.; Zylstra, A. B.; Rosenberg, M. J.; Amendt, P.; Delettrez, J.; Bellei, C.; Frenje, J. A.; Gatu Johnson, M.; Seguin, F. H.; Petrasso, R. D.; Betti, R.; Glebov, V. Yu.; Meyerhofer, D. D.; Sangster, T. C.; Stoeckl, C.; Landen, O.; Smalyuk, V. A.; Wilks, S.; Greenwood, A.; Nikroo, A.

    2014-04-01T23:59:59.000Z

    A strong nonhydrodynamic mechanism generating atomic fuel-shell mix has been observed in strongly shocked inertial confinement fusion implosions of thin deuterated-plastic shells filled with He 3 gas. These implosions were found to produce DHe 3 -proton shock yields comparable to implosions of identical shells filled with a hydroequivalent 50?50 DHe 3 gas mixture. Standard hydrodynamic mixing cannot explain this observation, as hydrodynamic modeling including mix predicts a yield an order of magnitude lower than was observed. Instead, these results can be attributed to ion diffusive mix at the fuel-shell interface.

  2. RCRA Assessment Plan for Single-Shell Tank Waste Management Area A-AX at the Hanford Site

    SciTech Connect (OSTI)

    Narbutovskih, Susan M.; Chou, Charissa J.

    2006-03-03T23:59:59.000Z

    This document describes a groundwater assessment plan for the single-shell tank systems in Waste Management Area A-AX at the Hanford Site.

  3. Fe{sub 3}O{sub 4} and CdS based bifunctional coreshell nanostructure

    SciTech Connect (OSTI)

    Joseph, Joshy; Nishad, K.K.; Sharma, M.; Gupta, D.K. [Department of Physics, Barkatullah University, Bhopal 462026, MP (India)] [Department of Physics, Barkatullah University, Bhopal 462026, MP (India); Singh, R.R. [ITM University, NH 75, Jhansi Road, Gwalior 474001, MP (India)] [ITM University, NH 75, Jhansi Road, Gwalior 474001, MP (India); Pandey, R.K., E-mail: prof.rkpandey@gmail.com [ITM University, NH 75, Jhansi Road, Gwalior 474001, MP (India)

    2012-06-15T23:59:59.000Z

    Highlights: ? First report on a room temperature aqueous process for growth of a hybrid core shell nanostructure containing a magnetic core and a semiconducting shell. ? Formation of distinct core shell nanostructure revealed by high resolution transmission electron microscopy. ? A bifunctional nature combining magnetic as well as photoresponce for the as synthesised core shell nanostructures demonstrated. ? A tendency towards self organisation of the coreshell nanostructure. ? Possible applications including purification and isolation of biological materials, drug delivery system, bio-labels, spintronics, etc. -- Abstract: A room temperature solution process for synthesis of Fe{sub 3}O{sub 4} nanoparticles and their hybrid core shell nanostructures using CdS as the shell material has been described. The as grown particles have been characterised using XRD, Rietveld refinement, high resolution transmission electron microscopy, atomic force microscopy, superconducting quantum interference device, optical absorbance and photoluminescence spectroscopy. A superparamagnetic response revealed from the magnetisation measurements of the as synthesised magnetite nanoparticles was retained even after the growth of the CdS shell. From luminescence and high resolution atomic force microscopy measurements, it is shown that the coreshell structures advantageously combine magnetic as well as fluorescence response with a tendency towards self-organization.

  4. Inner-Shell Capture and Ionization in Collisions of H+, He2+, and Li3+ Projectiles with Neon and Carbon

    E-Print Network [OSTI]

    Ford, A. Lewis; Reading, John F.; Becker, R. L.

    1981-01-01T23:59:59.000Z

    PHYSICAL REVIEW A VOLUME 23, NUMBF R FEBRUARY 1981 Inner-shell capture and ionization in collisions of H+, He'+, and Li'+ projectiles with neon and carbon A. L. Ford~ and J. F. Reading* Physics Department, Texas A &M University, College Station...) Li++ Ne, and (d) H'+ C. The open triangles in (d) are results calculated with the carbon X-shell orbital energy adjusted to give the experimental K-shell binding energy. Note that the scale on the vertical axis is lin- ear. INNER-SHELL CAPTURE...

  5. Radiation-reaction in classical offshell electrodynamics: I. The above mass-shell case

    E-Print Network [OSTI]

    I. Aharonovich; L. P. Horwitz

    2011-05-27T23:59:59.000Z

    Offshell electrodynamics based on a manifestly covariant off-shell relativistic dynamics of Stueckelberg, Horwitz and Piron, is five-dimensional. In this paper, we study the problem of radiation reaction of a particle in motion in this framework. In particular, the case of above-mass-shell is studied in detail, where the renormalization of the Lorentz force leads to a system of non-linear differential equations for 3 Lorentz scalars. The system is then solved numerically, where it is shown that the mass-shell deviation scalar $\\ve$ either smoothly falls down to 0 (this result provides a mechanism for the mass stability of the off-shell theory), or strongly diverges under more extreme conditions. In both cases, no runaway motion is observed. Stability analysis indicates that the system seems to have chaotic behavior in the divergent case. It is also shown that, although a motion under which the mass-shell deviation $\\ve$ is constant but not-zero, is indeed possible, but, it is unstable, and eventually it either decays to 0 or diverges.

  6. The effect of mix on capsule yields as a function of shell thickness and gas fill

    SciTech Connect (OSTI)

    Bradley, P. A., E-mail: pbradley@lanl.gov [Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

    2014-06-15T23:59:59.000Z

    An investigation of direct drive capsules with different shell thicknesses and gas fills was conducted to examine the amount of shock induced (Richtmyer-Meshkov) mix versus Rayleigh-Taylor mix from deceleration of the implosion. The RAGE (Eulerian) code with a turbulent mix model was used to model these capsules for neutron yields along with time-dependent mix amounts. The amount of Richtmyer-Meshkov induced mix from the shock breaking out of the shell is about 0.1??g (0.15??m of shell material), while the Rayleigh-Taylor mix is of order 1??g and determines the mixed simulation yield. The simulations were able to calculate a yield over mix (YOM) ratio (experiment/mix simulation) between 0.5 and 1.0 for capsules with shell thicknesses ranging from 7.5 to 20??m and with gas fills between 3.8 and 20?atm of D{sub 2} or DT. The simulated burn averaged T{sub ion} values typically lie with 0.5?keV of the data, which is within the measurement error. For capsules with shell thicknesses >25??m, the YOM values drop to 0.10??0.05, suggesting that some unmodeled effect needs to be accounted for in the thickest capsules.

  7. Liquid immiscibility and core-shell morphology formation in ternary AlBiSn alloys

    SciTech Connect (OSTI)

    Dai, R.; Zhang, J.F.; Zhang, S.G., E-mail: sgzhang@sjtu.edu.cn; Li, J.G.

    2013-07-15T23:59:59.000Z

    The effects of composition on liquid immiscibility, macroscopic morphology, microstructure and phase transformation in ternary AlBiSn alloys were investigated. Three types of morphology, the core-shell type, the stochastic droplet type and uniform dispersion type, of AlBiSn particles prepared by a jet breakup process were distinguished, and the relationships between which were discussed. The phase transformation behaviors of the AlBiSn alloys were studied by thermal analysis, in agreement with the microstructural observation and microanalysis. The liquid immiscibility and formation of the core-shell morphology in AlBiSn alloys are easily achieved when the composition lies in the liquid miscibility gap. The particles exhibit a high melting point Al-rich core with a low melting point SnBi-rich solder shell, showing promise for application as high-density electronic packaging materials. - Highlights: The liquid demixing, morphology and microstructure in AlBiSn alloys were studied. Three types of morphology were classified and discussed. The conditions for formation of the core-shell morphology were obtained. The phase transition behaviors agree with the microstructure characterization. The Al/SnBi core-shell particles show promise for use in electronic packaging.

  8. Ab initio investigation of the first hydration shell of protonated glycine

    SciTech Connect (OSTI)

    Wei, Zhichao; Chen, Dong, E-mail: dongchen@henu.edu.cn, E-mail: boliu@henu.edu.cn; Zhao, Huiling; Li, Yinli; Zhu, Jichun; Liu, Bo, E-mail: dongchen@henu.edu.cn, E-mail: boliu@henu.edu.cn [Institute of Photo-Biophysics, Physics and Electronics Department, Henan University, 475004 Kaifeng (China)] [Institute of Photo-Biophysics, Physics and Electronics Department, Henan University, 475004 Kaifeng (China)

    2014-02-28T23:59:59.000Z

    The first hydration shell of the protonated glycine is built up using Monte Carlo multiple minimum conformational search analysis with the MMFFs force field. The potential energy surfaces of the protonated glycine and its hydration complexes with up to eight water molecules have been scanned and the energy-minimized structures are predicted using the ab initio calculations. First, three favorable structures of protonated glycine were determined, and the micro-hydration processes showed that water can significantly stabilize the unstable conformers, and then their first hydration shells were established. Finally, we found that seven water molecules are required to fully hydrate the first hydration shell for the most stable conformer of protonated glycine. In order to analyse the hydration process, the dominant hydration sites located around the ammonium and carboxyl groups are studied carefully and systemically. The results indicate that, water molecules hydrate the protonated glycine in an alternative dynamic hydration process which is driven by the competition between different hydration sites. The first three water molecules are strongly attached by the ammonium group, while only the fourth water molecule is attached by the carboxyl group in the ultimate first hydration shell of the protonated glycine. In addition, the first hydration shell model has predicted most identical structures and a reasonable accord in hydration energy and vibrational frequencies of the most stable conformer with the conductor-like polarizable continuum model.

  9. The jump-off velocity of an impulsively loaded spherical shell

    SciTech Connect (OSTI)

    Chabaud, Brandon M. [Los Alamos National Laboratory; Brock, Jerry S. [Los Alamos National Laboratory

    2012-04-13T23:59:59.000Z

    We consider a constant temperature spherical shell of isotropic, homogeneous, linearly elastic material with density {rho} and Lame coefficients {lambda} and {mu}. The inner and outer radii of the shell are r{sub i} and r{sub o}, respectively. We assume that the inside of the shell is a void. On the outside of the shell, we apply a uniform, time-varying pressure p(t). We also assume that the shell is initially at rest. We want to compute the jump-off time and velocity of the pressure wave, which are the first time after t = 0 at which the pressure wave from the outer surface reaches the inner surface. This analysis computes the jump-off velocity and time for both compressible and incompressible materials. This differs substantially from [3], where only incompressible materials are considered. We will consider the behavior of an impulsively loaded, exponentially decaying pressure wave p(t) = P{sub 0{sup e}}{sup -{alpha}t}, where {alpha} {ge} 0. We notice that a constant pressure wave P(t) = P{sub 0} is a special case ({alpha} = 0) of a decaying pressure wave. Both of these boundary conditions are considered in [3].

  10. Supernovae from direct collisions of white dwarfs and the role of helium shell ignition

    E-Print Network [OSTI]

    Papish, Oded

    2015-01-01T23:59:59.000Z

    Models for supernovae (SNe) arising from thermonuclear explosions of white dwarfs (WDs) have been extensively studied over the last few decades, mostly focusing on the single degenerate (accretion of material of a WD) and double degenerate (WD-WD merger) scenarios. In recent years it was suggested that WD-WD direct collisions provide an additional channel for such explosions. Here we extend the studies of such explosions, and explore the role of Helium-shells in affecting the thermonuclear explosions. We study both the impact of low-mass helium ($\\sim0.01$ M$_{\\odot})$ shells, as well as high mass shells ($\\ge0.1$ M$_{\\odot}$). We find that detonation of the massive helium layers precede the detonation of the WD Carbon-Oxygen (CO) bulk during the collision and can change the explosive evolution and outcomes for the cases of high mass He-shells. In particular, the He-shell detonation propagates on the WD surface and inefficiently burns material prior to the CO detonation that later follows in the central parts...

  11. Effective shell model Hamiltonians from density functional theory: quadrupolar and pairing correlations

    E-Print Network [OSTI]

    R. Rodriguez-Guzman; Y. Alhassid; G. F. Bertsch

    2007-09-04T23:59:59.000Z

    We describe a procedure for mapping a self-consistent mean-field theory (also known as density functional theory) into a shell model Hamiltonian that includes quadrupole-quadrupole and monopole pairing interactions in a truncated space. We test our method in the deformed N=Z sd-shell nuclei Ne-20, Mg-24 and Ar-36, starting from the Hartree-Fock plus BCS approximation of the USD shell model interaction. A similar procedure is then followed using the SLy4 Skyrme energy density functional in the particle-hole channel plus a zero-range density-dependent force in the pairing channel. Using the ground-state solution of this density functional theory at the Hartree-Fock plus BCS level, an effective shell model Hamiltonian is constructed. We use this mapped Hamiltonian to extract quadrupolar and pairing correlation energies beyond the mean field approximation. The rescaling of the mass quadrupole operator in the truncated shell model space is found to be almost independent of the coupling strength used in the pairing channel of the underlying mean-field theory.

  12. Cofiring lignite with hazelnut shell and cotton residue in a pilot-scale fluidized bed combustor

    SciTech Connect (OSTI)

    Zuhal Gogebakan; Nevin Selcuk [Middle East Technical University, Ankara (Turkey). Department of Chemical Engineering

    2008-05-15T23:59:59.000Z

    In this study, cofiring of high ash and sulfur content lignite with hazelnut shell and cotton residue was investigated in 0.3 MWt METU Atmospheric Bubbling Fluidized Bed Combustion (ABFBC) Test Rig in terms of combustion and emission performance of different fuel blends. The results reveal that cofiring of hazelnut shell and cotton residue with lignite increases the combustion efficiency and freeboard temperatures compared to those of lignite firing with limestone addition only. CO{sub 2} emission is not found sensitive to increase in hazelnut shell and cotton residue share in fuel blend. Cofiring lowers SO{sub 2} emissions considerably. Cofiring of hazelnut shell reduces NO and N{sub 2}O emissions; on the contrary, cofiring cotton residue results in higher NO and N{sub 2}O emissions. Higher share of biomass in the fuel blend results in coarser cyclone ash particles. Hazelnut shell and cotton residue can be cofired with high ash and sulfur-containing lignite without operational problems. 32 refs., 12 figs., 11 tabs.

  13. Hanford Double-Shell Tank Inspection Annual Report Calendar Year 2012

    SciTech Connect (OSTI)

    Petermann, Tasha M.; Boomer, Kayle D.; Washenfelder, D. J.

    2013-12-02T23:59:59.000Z

    The double-shell tanks (DSTs) were constructed between 1968 and 1986. They will have exceeded their design life before the waste can be removed and trasferred to the Waste Treatment and Immobilization Plant for vitrification. The Double-Shell Tank Integrity Project has been established to evaluate tank aging, and ensure that each tank is structurally sound for continued use. This is the first issue of the Double-Shell Tank Inspection Annual Report. The purpose of this issue is to summarize the results of DST inspections conducted from the beginnng of the inspection program through the end of CY2012. Hereafter, the report will be updated annually with summaries of the past year's DST inspection activities.

  14. Ab Initio Study of 40Ca with an Importance Truncated No-Core Shell Model

    SciTech Connect (OSTI)

    Roth, R; Navratil, P

    2007-05-22T23:59:59.000Z

    We propose an importance truncation scheme for the no-core shell model, which enables converged calculations for nuclei well beyond the p-shell. It is based on an a priori measure for the importance of individual basis states constructed by means of many-body perturbation theory. Only the physically relevant states of the no-core model space are considered, which leads to a dramatic reduction of the basis dimension. We analyze the validity and efficiency of this truncation scheme using different realistic nucleon-nucleon interactions and compare to conventional no-core shell model calculations for {sup 4}He and {sup 16}O. Then, we present the first converged calculations for the ground state of {sup 40}Ca within no-core model spaces including up to 16{h_bar}{Omega}-excitations using realistic low-momentum interactions. The scheme is universal and can be easily applied to other quantum many-body problems.

  15. A new class of stable $(2+1)$ dimensional thin shell wormhole

    E-Print Network [OSTI]

    Farook Rahaman; A. Banerjee; I. Radinschi

    2011-09-05T23:59:59.000Z

    Recently, Ba\\~{n}ados, Teitelboim and Zanelli (BTZ) \\cite{BTZ1992} has discovered an explicit vacuum solution of (2+1)-dimensional gravity with negative cosmological constant. It has been argued that the existence of such physical systems with an event horizon and thermodynamic properties similar to (3+1) dimensional black holes. These vacuum solutions of (2+1)-dimensional gravity are asymptotically anti-de Sitter and are known as BTZ black holes. We provide a new type of thin-shell stable wormhole from the BTZ black holes. This is the first example of stable thin shell wormhole in (2+1)-dimension. Several characteristics of this thin-shell wormhole have been discussed.

  16. Thermoelectric characteristic of the rough InN/GaN core-shell nanowires

    SciTech Connect (OSTI)

    Wu, Chao-Wei; Wu, Yuh-Renn, E-mail: yrwu@ntu.edu.tw [Graduate Institute of Photonics and Optoelectronics and Department of Electrical Engineering, National Taiwan University, Taipei 10617, Taiwan (China)

    2014-09-14T23:59:59.000Z

    An analysis to model the thermoelectric (TE) effects of the rough InN/GaN core-shell nanowires (NWs) with wire diameter ranging from 25?nm to 100?nm is proposed. The elastic continuum model is employed to calculate the phonon dispersion relation curves and the related phonon group velocity. Within the framework of Boltzmann transport equations and relaxation time approximation, the electrical conductivity, Seebeck coefficient, electronic thermal conductivity, and the lattice thermal conductivity is obtained. Simulation results indicate that TE properties of the rough InN/GaN core-shell NWs are strongly affected by the surface roughness and the diameter of NWs. The optimized condition of the proposed rough InN/GaN core-shell TE NWs is studied in this paper and the highest ZT obtained in the calculation is 0.8598 at 300?K and 1.713 at 1000?K.

  17. Effects of tensor interaction on pseudospin energy splitting and shell correction

    E-Print Network [OSTI]

    J. M. Dong; W. Zuo; J. Z. Gu; Y. Z. Wang; L. G. Cao; X. Z. Zhang

    2011-11-02T23:59:59.000Z

    In the framework of a Skyrme-Hartree-Fock approach combined with BCS method, the role of the tensor force on the pseudospin energy splitting for tin isotope chain is investigated. The tensor force turns out to obviously affect the pseudospin energy splitting of the spin-unsaturated nuclei. Since the tensor force shifts the single-particle levels, it modifies the single-particle level density and the shell correction energy thereof. The influence of the tensor interaction on shell correction energy is considerable according to our analysis taking a magic nucleus $^{132}$Sn as well as a superheavy nucleus $^{298}114$ as examples. This modification of the shell correction energy due to the tensor component affects the stability of the superheavy nuclei.

  18. Off-shell photon distribution amplitudes in the low-energy effective theory of QCD

    E-Print Network [OSTI]

    Xin Mo; Jueping Liu

    2014-02-25T23:59:59.000Z

    Based on the principle of the Lorentz covariance the transition matrix elements from an off-shell photon state to the vacuum are decomposed into the light-cone photon DAs, in which only two transversal DAs survive in the on-shell limit. The eight off-shell light-cone photon distribution amplitudes (DAs) corresponding to chiral-odd and chiral-even up to twist-four and the corresponding coupling constants are studied systematically in the instanton vacuum model of quantum chromodynamics (QCD). The various individual photon DA multiplied by its corresponding coupling constant is expressed in terms of the correlation functions, which are connected with the spectral densities of an effective quark propagator, and then evaluated in the low-energy effective theory derived from the instanton vacuum model of QCD. The explicit analytical expressions and the numerical results for the photon DAs and their coupling constants are given.

  19. Challenges for a reliable shell model description of the neutrinoless double beta decay matrix elements

    SciTech Connect (OSTI)

    Horoi, Mihai [Department of Physics, Central Michigan University, Mount Pleasant, Michigan, 48859 (United States)

    2011-12-16T23:59:59.000Z

    Assuming that the neutrinos are Majorana particles and the neutrinoless double beta (0{nu}{beta}{beta}) decay is observed, a reliable 0{nu}{beta}{beta} matrix element is necessary to decide the neutrino mass hierarchy and the minimum neutrino mass. Many nuclear structure techniques, including the shell model, are presently used to calculate these matrix elements. In the last few years one could see a slow convergence of these results, but not yet at a level of 20 several shell model effective interactions and varying other parameters, finding results in a range that spans about 20In this contribution we describe challenges for obtaining reliable shell model 0{nu}{beta}{beta} matrix elements, with emphasis to {sup 76}Ge and {sup 82}Se decays.

  20. Nonperturbative renormalization of the neutrinoless double-beta operator in p-shell nuclei

    E-Print Network [OSTI]

    Deepshikha Shukla; Jonathan Engel; Petr Navratil

    2011-08-15T23:59:59.000Z

    We use Lee-Suzuki mappings and related techniques to construct effective two-body p-shell interactions and neutrinoless double-beta operators that exactly reproduce the results of large no-core-shell-model calculations of double-beta decay in nuclei with mass number A=6. We then apply the effective operators to the decay of nuclei with A=7, 8, and 10, again comparing with no-core calculations in much larger spaces. The results with the effective two-body operators are generally good. In some cases, however, they differ non-negligibly from the full no-core results, suggesting that three-body corrections to the decay operator in heavier nuclei may be important. An application of our procedure and related ideas to fp-shell nuclei such as 76Ge should be feasible within coupled-cluster theory.

  1. Evidence for ablated flows in the shell of nova DQ Her

    E-Print Network [OSTI]

    N. M. H. Vaytet; T. J. O'Brien; A. P. Rushton

    2007-06-01T23:59:59.000Z

    High-resolution longslit Halpha spectra of the shell of the old nova DQ Her have been obtained with the William Herschel Telescope using the ISIS spectrograph. An equatorial expansion velocity of 370+/-14 km/s is derived from the spectra which, in conjunction with a narrowband Halpha image of the remnant, allows a distance estimate of 525+/-28 pc. An equatorial ring which exhibits enhanced [NII] emission has also been detected and the inclination angle of the shell is found to be 86.8+/-0.2 degrees with respect to the line of sight. The spectra also reveal tails extending from the clumps in the shell, which have a radial velocity increasing along their length. This suggests the presence of a stellar wind, collimated in the polar direction, which ablates fragments of material from the clumps and accelerates them into its stream up to a terminal velocity of order 800-900 km/s.

  2. A Survey of Vapors in the Headspaces of Single-Shell Waste Tanks

    SciTech Connect (OSTI)

    Stock, Leon M.; Huckaby, James L.

    2000-10-31T23:59:59.000Z

    This report summarizes data on the organic vapors in the single-shell high level radioactive waste tanks at the Hanford site to support a forthcoming toxicological study. All data were obtained from the Tank Characterization Database (PNNL 1999). The TCD contains virtually all the available tank headspace characterization data from 1992 to the present, and includes data for 109 different single-shell waste tanks. Each single-shell tank farm and all major waste types are represented. Descriptions of the sampling and analysis methods have been given elsewhere (Huckaby et al. 1995, Huckaby et al. 1996), and references for specific data are available in the TCD. This is a revision of a report with the same title issued on March 1, 2000 (Stock and Huckaby 2000).

  3. Shell model half-lives for r-process N=82 nuclei

    E-Print Network [OSTI]

    J. J. Cuenca-Garcia; G. Martinez-Pinedo; K. Langanke; F. Nowacki; I. N. Borzov

    2008-11-07T23:59:59.000Z

    We have performed shell-model calculations of the half-lives and neutron-branching probabilities of the r-process waiting point nuclei at the magic neutron number N=82. These new calculations use a larger model space than previous shell model studies and an improved residual interaction which is adjusted to recent spectroscopic data around A=130. Our shell-model results give a good account of all experimentally known half-lives and $Q_\\beta$-values for the N=82 r-process waiting point nuclei. Our half-life predictions for the N=82 nuclei with Z=42--46 agree well with recent estimates based in the energy-density functional method.

  4. Anomalous shell effect in the transition from a circular to a triangular billiard

    E-Print Network [OSTI]

    Ken-ichiro Arita; Matthias Brack

    2008-04-25T23:59:59.000Z

    We apply periodic orbit theory to a two-dimensional non-integrable billiard system whose boundary is varied smoothly from a circular to an equilateral triangular shape. Although the classical dynamics becomes chaotic with increasing triangular deformation, it exhibits an astonishingly pronounced shell effect on its way through the shape transition. A semiclassical analysis reveals that this shell effect emerges from a codimension-two bifurcation of the triangular periodic orbit. Gutzwiller's semiclassical trace formula, using a global uniform approximation for the bifurcation of the triangular orbit and including the contributions of the other isolated orbits, describes very well the coarse-grained quantum-mechanical level density of this system. We also discuss the role of discrete symmetry for the large shell effect obtained here.

  5. Assessment of single-shell tank residual-liquid issues at Hanford Site, Washington

    SciTech Connect (OSTI)

    Murthy, K.S.; Stout, L.A.; Napier, B.A.; Reisenauer, A.E.; Landstrom, D.K.

    1983-06-01T23:59:59.000Z

    This report provides an assessment of the overall effectiveness and implications of jet pumping the interstitial liquids (IL) from single-shell tanks at Hanford. The jet-pumping program, currently in progress at Hanford, involves the planned removal of IL contained in 89 of the 149 single-shell tanks and its transfer to double-shell tanks after volume reduction by evaporation. The purpose of this report is to estimate the public and worker doses associated with (1) terminating pumping immediately, (2) pumping to a 100,000-gal limit per tank, (3) pumping to a 50,000-gal limit per tank, and (4) pumping to the maximum practical liquid removal level of 30,000 gal. Assessment of the cost-effectiveness of these various levels of pumping in minimizing any undue health and safety risks to the public or worker is also presented.

  6. Spherical Shell Cosmological Model and Uniformity of Cosmic Microwave Background Radiation

    E-Print Network [OSTI]

    Branislav Vlahovic

    2012-07-06T23:59:59.000Z

    Considered is spherical shell as a model for visible universe and parameters that such model must have to comply with the observable data. The topology of the model requires that motion of all galaxies and light must be confined inside a spherical shell. Consequently the observable universe cannot be defined as a sphere centered on the observer, rather it is an arc length within the volume of the spherical shell. The radius of the shell is 4.46 $\\pm$ 0.06 Gpc, which is for factor $\\pi$ smaller than radius of a corresponding 3-sphere. However the event horizon, defined as the arc length inside the shell, has the size of 14.0 $\\pm$ 0.2 Gpc, which is in agreement with the observable data. The model predicts, without inflation theory, the isotropy and uniformity of the CMB. It predicts the correct value for the Hubble constant $H_0$ = 67.26 $\\pm$ 0.90 km/s/Mpc, the cosmic expansion rate $H(z)$, and the speed of the event horizon in agreement with observations. The theoretical suport for shell model comes from general relativity, curvature of space by mass, and from holographic principle. The model explains the reason for the established discrepancy between the non-covariant version of the holographic principle and the calculated dimensionless entropy $(S/k)$ for the visible universe, which exceeds the entropy of a black hole. The model is in accordance with the distribution of radio sources in space, type Ia data, and data from the Hubble Ultra Deep Field optical and near-infrared survey.

  7. Photoelastic investigations of stress concentration in perforated cylindrical shells with internal pressure

    SciTech Connect (OSTI)

    Dranchenko, B.N.; Portnov, B.B.; Seleznev, A.V.; Danilova, T.N.; Komarova, S.N.; Ponomareva, V.K.

    1994-06-01T23:59:59.000Z

    Cylindrical shells with regular perforation are widely used in power generating equipment and in particular in collectors 1 of the circuit of steam generators of power generating installations with water-water reactors (WWPR) The state of stress of collectors is determined by a broad spectrum of technological and operational loads, it is therefore difficult to analyze it theoretically. The aim of the present work is the experimental investigation of stresses in the cylindrical shells of collectors subjected to internal pressure, the generalization and systematization of empirical data in the form of engineering formulas and nomographs. The investigations were carried out with photoelastic three-dimensional models with the use of {open_quotes}freezing{close_quotes}. The basic characteristics of the state of stress of perforated shells (in particular those used in calculations of the strength and life of collectors) are the values of the stress intensity factor K and of the stress intensification factor {gamma}{sub {bar {sigma}}}{sub me} of the mean integral stress level in the neck between neighboring holes. The presented data make it possible to establish quantitatively the regularities of change of K and {gamma}{sub {bar {sigma}}}{sub me} in dependence on the geometry of the perforated shells. These data were systematized according to a special program of multifactor regression analysis. It follows from the presented formulas and nomographs in particular that in the ranges of the geometry of the perforated shells K may change from 2.5 to 4.0, and {gamma}{sub {bar {sigma}}}{sub me} from 1.1 to 2.3. Therefore varied geometric parameters have a substantial effect on the load intensity of perforated shells, and that once again confirms how topical it is to obtain new experimental data, to generalize and systematize them.

  8. Feed specification for the double-shell tank/single shell tank waste blend for high-level waste vitrification process and melter testing

    SciTech Connect (OSTI)

    Tracey, E.M.; Merz, M.D.; Patello, G.K.; Wiemers, K.D.

    1996-02-01T23:59:59.000Z

    The High-Level Waste (HLW) Vitrification Program is developing technology for the Department of Energy to immobilize high-level and transuranic waste as glass for permanent disposal. In support of the program, Pacific Northwest Laboratory (PNL) is conducting laboratory-scale melter feed preparation studies and HLW melter testing which require a simulated HLW feed. The simulant HLW feed represents a blend of the waste from 177 single shell and double shell tanks. The waste blend composition is based on normalized track radionuclide components (TRAC), historical tank data, and assumptions on the pretreatment of the waste. The HLW simulant feed specification for the waste blend composition provides direction for the preparation of laboratory-scale and large-scale HLW blend simulant to be used in melter feed preparation studies and melter testing.

  9. Inviscid Limits for a Stochastically Forced Shell Model of Turbulent Flow

    E-Print Network [OSTI]

    Susan Friedlander; Nathan Glatt-Holtz; Vlad Vicol

    2014-04-03T23:59:59.000Z

    We establish the anomalous mean dissipation rate of energy in the inviscid limit for a stochastic shell model of turbulent fluid flow. The proof relies on viscosity independent bounds for stationary solutions and on establishing ergodic and mixing properties for the viscous model. The shell model is subject to a degenerate stochastic forcing in the sense that noise acts directly only through one wavenumber. We show that it is hypo-elliptic (in the sense of Hormander) and use this property to prove a gradient bound on the Markov semigroup.

  10. Expert Panel Recommendations for Hanford Double-Shell Tank Life Extension

    SciTech Connect (OSTI)

    Stewart, Charles W.; Bush, Spencer H.; Berman, Herbert S.; Czajkowski, Carl J.; Divine, James R.; Posakony, Gerald J.; Johnson, A. B.; Elmore, Monte R.; Reynolds, D. A.; Anantatmula, Ramamohan P.; Sindelar, Robert L.; Zapp, Philip E.

    2001-06-29T23:59:59.000Z

    Expert workshops were held in Richland in May 2001 to review the Hanford Double-Shell Tank Integrity Project and make recommendations to extend the life of Hanford's double-shell waste tanks. The workshop scope was limited to corrosion of the primary tank liner, and the main areas for review were waste chemistry control, tank inspection, and corrosion monitoring. Participants were corrosion experts from Hanford, Savannah River Site, Brookhaven National Laboratory, Pacific Northwest National Laboratory, and several consultants. This report describes the current state of the three areas of the program, the final recommendations of the workshop, and the rationale for their selection.

  11. Numerical methods of integration applied in the nonlinear dynamic analysis of shells of revolution

    E-Print Network [OSTI]

    Tillerson, Joe Richard

    2012-06-07T23:59:59.000Z

    structural bel&avior a&d therefore cannot be used for nonlinear analyses. lhe second nðod of dynamic analysis uses numerical integra- tion of the equations of notion wit'bout necessitating a transforma- tion of coordinates. Tne numerical integration...!riinear beam analysis {first vibratory mode only) with the most prc!! ising methods b ing programmed for shell analy! es. Rea- listic test problems are used to evaluate three of the numerical integration procedures as applied in shell of revolution analyses...

  12. Effects of dietary phosphorus and high ambient temperature on egg shell quality in hens

    E-Print Network [OSTI]

    Bailey, Christopher Anthony

    1979-01-01T23:59:59.000Z

    EFFECTS OF DIETARY PHOSPHORUS AND HIG11 AMB1ENT TEMPERATURE ON EGG SHELL QUALITY IN HENS A Thesis by CHRISTOPHER ANTHONY BAI1EEY Submitted to the Graduate College of Texas A@I University in Partial fuI. fillme ~t of the requirement... for the degree of F1ASTER OF SCIENCE May 19 79 Major Subject: Poultry Science EFFECTS OF DIETARY PHOSPHORUS AND HIGH AMBIENT TEMPERATURE ON EGG SHELL QUALITY IN HENS A Thesis by CHRISTOPHER ANTHONY BAILEY Approved as to style and content by; ( hairm...

  13. Stability of Strutinsky Shell Correction Energy in Relativistic Mean Field Theory

    E-Print Network [OSTI]

    Y. F. Niu; H. Z. Liang; J. Meng

    2009-10-23T23:59:59.000Z

    The single-particle spectrum obtained from the relativistic mean field (RMF) theory is used to extract the shell correction energy with the Strutinsky method. Considering the delicate balance between the plateau condition in the Strutinsky smoothing procedure and the convergence for the total binding energy, the proper space sizes used in solving the RMF equations are investigated in detail by taking 208Pb as an example. With the proper space sizes, almost the same shell correction energies are obtained by solving the RMF equations either on basis space or in coordinate space.

  14. L- and M-shell absorption measurements of radiatively heated Fe plasma

    SciTech Connect (OSTI)

    Zhang Jiyan; Li Hang; Zhao Yang; Xiong Gang; Yuan Zheng; Zhang Haiying; Yang Guohong; Yang Jiamin; Liu Shenye; Jiang Shaoen; Ding Yongkun; Zhang Baohan; Zheng Zhijian [Research Center of Laser Fusion, P. O. Box 919-986, Mianyang 621900 (China); Xu Yan; Meng Xujun; Yan Jun [Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China)

    2012-11-15T23:59:59.000Z

    Measurements of iron-plasma absorption spectrum over 150-1200 eV photon energy range were reported at temperature T = (72 {+-} 4) eV. The electron temperature was diagnosed with the absorption spectrum of aluminum mixed with iron. The density was not diagnosed directly but obtained from a radiative hydrodynamic simulation with the Multi-1D code. The broad photon energy range enables simultaneous observation of the L-shell and M-shell transitions that dominate the radiation transport at this temperature. The spectrally resolved transmission data were compared to the detailed-configuration-accounting model calculations and reasonable agreement was found.

  15. Binding Effects in High-Energy Scattering Applied to K-Shell Ionization

    E-Print Network [OSTI]

    Binstock, J.; Reading, John F.

    1975-01-01T23:59:59.000Z

    PHYSICA L RE VIEW A VOLUME 11, NUMBER APRIL 1975 Binding effects in high-energy scattering applied to K-shell ionization* J. Binstock and J. F. Reading Physics Department and Cyclotron Institute, Texas ASM University, College Station, Texas 77843... (Received 30 October 1974) The equation describing scattering of a fast ion by a E-shell electron, ihv 881/BZ = exp (iHe Z/k ) V(r, R) exp (-sHeZ/h v) S? where He ( ) =- {0 /2~ e)+ r ?(@ /~e) l8 1n Xo (&)/~&~ 8/8&:?FT+ BT, is solved in the Glauber...

  16. Semiclassical Estimates of Electromagnetic Casimir Self-Energies of Spherical and Cylindrical Metallic Shells

    E-Print Network [OSTI]

    Martin Schaden

    2010-06-16T23:59:59.000Z

    The leading semiclassical estimates of the electromagnetic Casimir stresses on a spherical and a cylindrical metallic shell are within 1% of the field theoretical values. The electromagnetic Casimir energy for both geometries is given by two decoupled massless scalars that satisfy conformally covariant boundary conditions. Surface contributions vanish for smooth metallic boundaries and the finite electromagnetic Casimir energy in leading semiclassical approximation is due to quadratic fluctuations about periodic rays in the interior of the cavity only. Semiclassically the non-vanishing Casimir energy of a metallic cylindrical shell is almost entirely due to Fresnel diffraction.

  17. On the energy-shell contributions of the three-particle~-~ three-hole excitations

    E-Print Network [OSTI]

    A. Mariano; F. Krmpoti?; A. F. R. de Toledo Piza

    1994-01-14T23:59:59.000Z

    The response functions for the extended second and third random phase approximation are compared. A second order perturbation calculation shows that the first-order amplitude for the direct $3p3h$ excitation from the ground state cancels with those that are engendered by the $1p1h$-$3p3h$ coupling. As a consequence nonvanishing $3p3h$ effects to the $1p1h$ response involve off energy shell renormalization only. On shell $3p3h$ processes are absent.

  18. Test procedures and instructions for single shell tank saltcake cesium removal with crystalline silicotitanate

    SciTech Connect (OSTI)

    Duncan, J.B.

    1997-01-07T23:59:59.000Z

    This document provides specific test procedures and instructions to implement the test plan for the preparation and conduct of a cesium removal test, using Hanford Single Shell Tank Saltcake from tanks 24 t -BY- I 10, 24 1 -U- 108, 24 1 -U- 109, 24 1 -A- I 0 1, and 24 t - S-102, in a bench-scale column. The cesium sorbent to be tested is crystalline siticotitanate. The test plan for which this provides instructions is WHC-SD-RE-TP-024, Hanford Single Shell Tank Saltcake Cesium Removal Test Plan.

  19. Scaling laws, transient times and shell effects in helium induced nuclear fission

    E-Print Network [OSTI]

    Th. Rubehn; K. X. Jing; L. G. Moretto; L. Phair; K. Tso; G. J. Wozniak

    1996-07-22T23:59:59.000Z

    Fission excitation functions of He-3 and He-4 induced compound nuclei are shown to scale exactly according to the Bohr-Wheeler transition state prediction once the shell effects are accounted for. The presented method furthermore allows one to model-independently extract values for the shell effects which are in good agreement to those obtained from liquid-drop model calculations. The fact that no deviations from the transition state method have been observed within the experimentally investigated excitation energy regime allows one to assign an upper limit for the transient time of 10 zs.

  20. Instability localized at the inner surface of an imploding spherical shell

    SciTech Connect (OSTI)

    Han, S.J.

    1983-01-01T23:59:59.000Z

    It is shown that in an imploding spherical shell the surface instabilities are of two different types. The first, which occurs at the outer surfaces, is the Rayleigh-Taylor instability. The second instability occurs at the inner surface. This latter instability is not as disruptive as R-T modes, but it has three basic properties which differ considerably from those of the R-T instability: (1) it is oscillatory at early times; (2) it grows faster in the long wavelength modes; (3) it depends on the equation of state. It is further shown that this new instability is driven by amplified sound waves in the shell.