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. 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

  3. 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: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:Energy: Grid Integration Redefining What's Possible for Renewable Energy:Nanowire3627 Federal Register /7 This is a preprint of028NuT NuT NuT

  4. 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are being directedAnnual Siteof Energy 2,AUDIT REPORTEnergyFarms AHefei SungrowHelukabelHoniton EnergyWindHugoHull

  5. 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...

  6. 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.

  7. WIND DATA REPORT WBZ Tower, Hull, MA

    E-Print Network [OSTI]

    Massachusetts at Amherst, University of

    WIND DATA REPORT WBZ Tower, Hull, MA 9/1/06-11/30/06 Prepared for Department of Energy (DOE) Golden.................................................................................................................... 10 Wind Speed Time Series...........................................................................................................

  8. WIND DATA REPORT WBZ Tower, Hull, MA

    E-Print Network [OSTI]

    Massachusetts at Amherst, University of

    WIND DATA REPORT WBZ Tower, Hull, MA 11/13/06-11/30/06 Prepared for Department of Energy (DOE.................................................................................................................... 10 Wind Speed Time Series.........................................................................................................

  9. Hull Wind: A Community Gets Green

    Energy Savers [EERE]

    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. 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...

  11. WIND DATA REPORT WBZ Tower, Hull, MA

    E-Print Network [OSTI]

    Massachusetts at Amherst, University of

    WIND DATA REPORT WBZ Tower, Hull, MA 12/1/06-2/28/07 Prepared for Department of Energy (DOE) Golden...................................................................................................................... 8 Wind Speed Time Series............................................................................................................. 9 Wind Speed Distributions

  12. Nuts and BoltsNuts and Bolts Clean Energy Muni Finance

    E-Print Network [OSTI]

    Kammen, Daniel M.

    Nuts and BoltsNuts and Bolts Clean Energy Muni Finance UC Berkeley Renewable and Appropriate Energy Financing · Financing cost administered through property taxg g bill · Little or no upfront cost to property Financing Options Special AssessmentsSpecial Assessments · Allow public improvements to be financed

  13. Hull Wind: A Community Gets Green

    Office of Energy Efficiency and Renewable Energy (EERE)

    U.S. Department of Energy Community and Renewable Energy Success Stories webinar series titled Wind Energy in Urban Environments. This presentation describes two wind turbine installations and plans for an off-shore development in Hull, Massachusetts, at the entrance to Boston Harbor.

  14. 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)

  15. Hull 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to: navigation, search OpenEIHesperia, California:Project Jump to:Would YouHualalaiCounty,Hull

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

    E-Print Network [OSTI]

    Nora Bretón; C. E. Ramírez-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.

  17. A Convex Hull Algorithm for Solving a Location Problem

    E-Print Network [OSTI]

    2013-05-21T23:59:59.000Z

    [8] H. Huntley, Emergency Health Services for the Nation, Public Health Reports 85 (6) (1970). [9] R. A. Jarvis, On the identification of the convex hull of a finite ...

  18. 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.

  19. Møller'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.

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

    E-Print Network [OSTI]

    Richards, Jason Halbert

    2004-09-30T23:59:59.000Z

    Double-nut anchor bolt systems are used in the erection of traffic signal poles, high-mast luminaries, and other highway appurtenances. An absence of a tightening standard for such systems decreases the confidence in their performance under fatigue...

  1. 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...

  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. 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

  5. Convex Hulls of Quadratically Parameterized Sets With Quadratic Constraints

    E-Print Network [OSTI]

    Nie, Jiawang

    2011-01-01T23:59:59.000Z

    Let V be a semialgebraic set parameterized by quadratic polynomials over a quadratic set T. This paper studies semidefinite representation of its convex hull by projections of spectrahedra (defined by linear matrix inequalities). When T is defined by a single quadratic constraint, we prove that its convex hull is equal to the first order moment type semidefinite relaxation of $V$, up to taking closures. Similar results hold when every quadratic polynomial is homogeneous and T is defined by two homogeneous quadratic constraints,or V is defined by rational quadratic parameterizations.

  6. Brazil-nut effect versus reverse Brazil-nut effect in a moderately dense granular fluid

    E-Print Network [OSTI]

    Vicente Garzo

    2008-09-03T23:59:59.000Z

    A new segregation criterion based on the inelastic Enskog kinetic equation is derived to show the transition between the Brazil-nut effect (BNE) and the reverse Brazil-nut effect (RBNE) by varying the different parameters of the system. In contrast to previous theoretical attempts the approach is not limited to the near-elastic case, takes into account the influence of both thermal gradients and gravity and applies for moderate densities. The form of the phase-diagrams for the BNE/RBNE transition depends sensitively on the value of gravity relative to the thermal gradient, so that it is possible to switch between both states for given values of the mass and size ratios, the coefficients of restitution and the solid volume fraction. In particular, the influence of collisional dissipation on segregation becomes more important when the thermal gradient dominates over gravity than in the opposite limit. The present analysis extends previous results derived in the dilute limit case and is consistent with the findings of some recent experimental results.

  7. Regularization of Kerr-NUT spacetimes and their thermodynamical quantities

    E-Print Network [OSTI]

    Nashed, G G L

    2015-01-01T23:59:59.000Z

    In the context of the teleparallel equivalent of general relativity (TEGR) theory, continues calculations of the total energy and momentum for Kerr-NUT spacetimes using three different methods, the gravitational energy-momentum, the Riemannian connection 1-form, ${\\widetilde{\\Gamma}_\\alpha}^\\beta$ and the Euclidean continuation method, have been achieved. Many local Lorentz transformations, that play the role of regularizing tool, are given to get the commonly known form of energy and momentum. We calculate the thermodynamic quantities of Kerr-NUT spacetime. We also investigate the first law of thermodynamics and quantum statistical relation.

  8. Regularization of Kerr-NUT spacetimes and their thermodynamical quantities

    E-Print Network [OSTI]

    G. G. L. Nashed

    2015-04-27T23:59:59.000Z

    In the context of the teleparallel equivalent of general relativity (TEGR) theory, continues calculations of the total energy and momentum for Kerr-NUT spacetimes using three different methods, the gravitational energy-momentum, the Riemannian connection 1-form, ${\\widetilde{\\Gamma}_\\alpha}^\\beta$ and the Euclidean continuation method, have been achieved. Many local Lorentz transformations, that play the role of regularizing tool, are given to get the commonly known form of energy and momentum. We calculate the thermodynamic quantities of Kerr-NUT spacetime. We also investigate the first law of thermodynamics and quantum statistical relation.

  9. 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

  10. 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

  11. The Estimation of Cottonseed Hulls in Cottonseed Meal. 

    E-Print Network [OSTI]

    Fraps, G. S.

    1908-01-01T23:59:59.000Z

    TEXAS AGRICULTURAL EXPERIMENT STATIONS. -- --- , BULLETIN NO. 109 , August, 1908. ', \\ G TECHNICAL BULLETIN onseed Meal. G. S. Fraps, Ph. D., Chemist. Post Office College Station, Brazos County, Texas. TEXAS AGRICULTURAL EXPERIMENT STATIC... is the approximate percentage of hulls in the meal, in excees of the quantity in meals of highest purity. Suppose, for example, 15 per cent of in- soluble residue is present in a given meal, subtracting 10 per cent and ad- ding 1-3 of the remainder gives us 6...

  12. 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.

  13. 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 onYou are now leaving Energy.gov You are now leaving Energy.gov You are beingZealand Jump to: navigation, search OpenEIHesperia, California:Project Jump to:Would YouHualalaiCounty,HullII

  14. VeriQuickhull: fast sequential and parallel algorithms for computing the planar convex hull

    E-Print Network [OSTI]

    Sambasivam, Mashilamani

    1999-01-01T23:59:59.000Z

    Computing the convex hull of a set of points in the plane is one of the most studied problems in computational geometry. The Quickhull algorithm is a popular convex hull algorithm. While the main structure of Quickhull is axed, many different...

  15. 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

  16. 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 ...

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

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    coatings consisting in surrounding the radiating parts of the hull by a layer of compliant material design regarding acoustic discretion and stealth, it is necessary to assess the efficiency of the coatings, not only the intrinsic properties of the material, but integrated on the hull. A method able

  18. 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

  19. VeriQuickhull: fast sequential and parallel algorithms for computing the planar convex hull 

    E-Print Network [OSTI]

    Sambasivam, Mashilamani

    1999-01-01T23:59:59.000Z

    Computing the convex hull of a set of points in the plane is one of the most studied problems in computational geometry. The Quickhull algorithm is a popular convex hull algorithm. While the main structure of Quickhull is axed, many different...

  20. 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-

  1. Meat Alternate Cookery: Eggs, Nuts, Soybeans, Dried Beans and Peas

    E-Print Network [OSTI]

    Sweeten, Mary K.

    1980-01-01T23:59:59.000Z

    sources of B vitamins . Nuts, because of the high fat content, are more readily digested if eaten in combination with cereals, vegetables or fruits . Dried beans and peas make nourishing dishes which are very filling. These legumes are good sources... . Soybeans are the best vegetable protein source to re place meat. Dry soybeans contain 1 V2 times as much protein as other dried beans and 11 times as much fat. Soybeans are limited in one of the essential amino acids so they must be combined...

  2. Heating and cooling gas-gun targets: nuts and bolts

    SciTech Connect (OSTI)

    Gustavsen, Richard L [Los Alamos National Laboratory; Bartram, Brian D [Los Alamos National Laboratory; Gehr, Russell J [HONEYWEL FM& T; Bucholtz, Scott M [HINEYWELL FM& T

    2009-01-01T23:59:59.000Z

    The nuts and bolts of a system used to heat and cool gas-gun targets is described. We have now used the system for more than 35 experiments, all of which have used electromagnetic gauging. Features of the system include a cover which is removed (remotely) just prior to projectile impact and the widespread use of metal/polymer insulations. Both the cover and insulation were required to obtain uniform temperatures in samples with low thermal conductivity. The use of inexpensive video cameras to make remote observations of the cover removal was found to be very useful. A brief catalog of useful glue, adhesive tape, insulation, and seal materials is given.

  3. 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.

  4. Consolidation of cladding hulls from the electrometallurgical treatment of spent fuel.

    SciTech Connect (OSTI)

    Keiser, D. D., Jr.

    1998-04-10T23:59:59.000Z

    To consolidate metallic waste that is residual from Argonne National Laboratory's electrometallurgical treatment of spent nuclear fuel, waste ingots are currently being cast using an induction furnace located in a hot cell. These ingots, which have been developed to serve as final waste forms destined for repository disposal, are stainless steel (SS)-Zr alloys (the Zr is very near 15 wt.%). The charge for the alloys consists of stainless steel cladding hulls, Zr from the fuel being treated, noble metal fission products, and minor amounts of actinides that are present with the cladding hulls. The actual in-dated cladding hulls have been characterized before they were melted into ingots, and the final as-cast ingots have been characterized to determine the degree of consolidation of the charge material. It has been found that ingots can be effectively cast from irradiated cladding hulls residual from the electrometallurgical treatment process by employing an induction furnace located in a hot cell.

  5. Fattening Steers on Cottonseed Meal and Cottonseed Hulls With and Without Corn; The Influence of Age on Fattening Steers.

    E-Print Network [OSTI]

    Jones, J. M. (John McKinley); Lush, Jay L. (Jay Laurence); Jones, James Hazlitt

    1923-01-01T23:59:59.000Z

    111 llsteers Lot IV 10 steers Third thirty days. ..... 115.6C.S.M 274.6corn ......... 612.8 hulls. ....... 210.2C.S.M ..... 871.1 hulls. ....... I 3.54C.S.M ...... 8.41corn .......... 18.77 hulls. ........ 5.39C.S.M ...... 22.34 hulls.... ........ Lot I11 11 steers Lot IV 10 steers Fourth thirty days. $10.11 8.17 ...... 3.23C.S.M 10.41 corn.. ........ 23.21 hulls. ........ ...... 6.18C.S.M 26.54 hulls. ........ Lot 111 llsteers Lot IV 10 steers (If the steer with the abscess were...

  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. Physics of viral shells

    E-Print Network [OSTI]

    Bruinsma, RF; Bruinsma, RF; Klug, WS

    2015-01-01T23:59:59.000Z

    constitute minimum free energy states but they typically areshells must have different energies so T = 7 shells shouldof thermodynamics, the Gibbs free energy of Physics of Viral

  8. 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. ...

  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

    Hull Wind II: A Case Study of the Development of a Second Large Wind Turbine Installation", the largest wind turbine (660 kW) yet installed in the state. That project proved to be so popular that HMLP undertook to develop a second, larger wind turbine project (1.8 MW). This paper provides a description

  10. 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.

  11. 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.

  12. 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.

  13. 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.

  14. 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...

  15. Einstein-Born-Infeld on Taub-NUT Spacetime in 2k+2 Dimensions

    E-Print Network [OSTI]

    A. Khodam-Mohammadi

    2009-05-26T23:59:59.000Z

    We wish to construct solutions of Taub-NUT spacetime in Einstein-Born-Infeld gravity in even dimensions. Since Born-Infeld theory is a nonlinear electrodynamics theory, in leads to nonlinear differential equations. However a proper analytical solution was not obtain, we try to solve it numerically (by the Runge-Kotta method) with initial conditions coinciding with those of our previous work in Einstein-Maxwell gravity. We solve equations for 4, 6 and 8 dimensions and do data fitting by the least-squares method. For N=l=b=1, the metric turns to the NUT solution only in 8 dimensions, but in 4 and 6 dimensions the spacetime does not have any Nut solution.

  16. Competition of Brazil nut effect, buoyancy, and inelasticity induced segregation in a granular mixture

    E-Print Network [OSTI]

    Ricardo Brito; Rodrigo Soto

    2010-12-21T23:59:59.000Z

    It has been recently reported that a granular mixture in which grains differ in their restitution coefficients presents segregation: the more inelastic particles sink to the bottom. When other segregation mechanisms as buoyancy and the Brazil nut effect are present, the inelasticity induced segregation can compete with them. First, a detailed analysis, based on numerical simulations of two dimensional systems, of the competition between buoyancy and the inelasticity induced segregation is presented, finding that there is a transition line in the parameter space that determines which mechanism is dominant. In the case of neutrally buoyant particles having different sizes the inelasticity induced segregation can compete with the Brazil nut effect (BNE). Reverse Brazil nut effect (RBNE) could be obtained at large inelasticities of the intruder. At intermediate values, BNE and RBNE coexist and large inelastic particles are found both near the bottom and at the top of the system.

  17. 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...

  18. 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

  19. Economic Lot-Sizing with Start-up Costs: The Convex Hull

    E-Print Network [OSTI]

    Van Hoesel, C. P. M.

    A partial description of the convex hull of solutions to the economic lot-sizing problem with start-up costs (ELSS) has been derived recently. Here a larger class of valid inequalities is given and it is shown that these ...

  20. 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...

  1. 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

  2. Effects of soil areation on trunk growth, yield and nut quality of pecan

    E-Print Network [OSTI]

    Chapman, Dan Lynn

    1996-01-01T23:59:59.000Z

    The effects of three soil aerators on trunk growth, yield, nut size, and percent kernel of pecan were studied at Frio, Medina, and San Saba Counties in Texas in 1993 and 1994. A complete randomized block design was used in each location to compare...

  3. Nonholonomic Ricci Flows and Running Cosmological Constant: 3D Taub-NUT Metrics

    E-Print Network [OSTI]

    Sergiu I. Vacaru; Mihai Visinescu

    2007-10-11T23:59:59.000Z

    The common assertion that the Ricci flows of Einstein spaces with cosmological constant can be modelled by certain classes of nonholonomic frame, metric and linear connection deformations resulting in nonhomogeneous Einstein spaces is examined in the light of the role played by topological three dimensional (3D) Taub-NUT-AdS/dS spacetimes.

  4. 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...

  5. 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.

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

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

    Mollusk Shell Nacre Ultrastructure Correlates with Environmental Temperature and Pressure Mollusk Shell Nacre Ultrastructure Correlates with Environmental Temperature and Pressure...

  7. 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

    1940. 6 Oviposition 1822. 5 1915. 5 Hatch 1877. 2 2008. 7 Nut Entry 1908. 8 2100. 2 First Significant Nut Entry (2%) - 1831. 1 1932. 5 2062. 1 2136. 1 1978. 0 2274. 0 2368. 3 2146. 0 2365. 4 2610. 0 Once the three variables (base... Prediction Location: Bexar Description: BEXAR THERMOGRAPH Date of Prediction: 6-2-92 County: Bexar Pupation Adult Oviposition Hatch Nut Entry Emergence 10% 25% 50% 75% 90% APR 20 APR 24 APR 28 MAY 2 MAY 5 MAY 7 MAY 10 MAY 13 MAY 17 MAY 19...

  8. 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

    1940. 6 Oviposition 1822. 5 1915. 5 Hatch 1877. 2 2008. 7 Nut Entry 1908. 8 2100. 2 First Significant Nut Entry (2%) - 1831. 1 1932. 5 2062. 1 2136. 1 1978. 0 2274. 0 2368. 3 2146. 0 2365. 4 2610. 0 Once the three variables (base... Prediction Location: Bexar Description: BEXAR THERMOGRAPH Date of Prediction: 6-2-92 County: Bexar Pupation Adult Oviposition Hatch Nut Entry Emergence 10% 25% 50% 75% 90% APR 20 APR 24 APR 28 MAY 2 MAY 5 MAY 7 MAY 10 MAY 13 MAY 17 MAY 19...

  9. PIXE Analysis of Metal Hull Bolts From HMB DeBraak

    SciTech Connect (OSTI)

    Correll, Francis D.; Cole, Lord K.; Slater, Charles J.; Vanhoy, Jeffrey R. [Physics Department, United States Naval Academy, 572C Holloway Road, Annapolis, MD 21402 (United States); Fithian, Charles H. [Delaware Division of Historical and Cultural Affairs, 21 The Green, Dover DE 19901 (United States)

    2009-03-10T23:59:59.000Z

    HMB DeBraak was a 16-gun British brig-sloop that sank in a squall on May 25, 1798 off Cape Henlopen, Delaware. Silt covered the wooden hull shortly after it sank, preserving it until DeBraak was raised in 1986. The items recovered from the ship include metal bolts that held the hull together. We used PIXE to measure the compositions of 45 of the bolts and found that they are nearly pure copper (98.3% on average), with most also containing small amounts of iron (0.87%), nickel (0.039%), arsenic (0.43%), silver (0.089%), lead (0.18%), and bismuth (0.12%). A few contain a little indium, tin, or antimony, but none contain zinc above the quantization level. The compositions are similar to those reported for 18th-century English copper, but different from several copper alloys also used to make hull bolts. We conclude that, when DeBraak was last fitted out in 1795-1797, the Royal Navy was still using bolts similar to William Forbes's mechanically hardened pure copper bolts. Forbes's process represents the successful innovation and application of new technology in Royal Navy ships during the wars of the late 18th century.

  10. Performance of Hull-Detection Algorithms For Proton Computed Tomography Reconstruction

    E-Print Network [OSTI]

    Schultze, Blake; Censor, Yair; Schulte, Reinhard; Schubert, Keith Evan

    2014-01-01T23:59:59.000Z

    Proton computed tomography (pCT) is a novel imaging modality developed for patients receiving proton radiation therapy. The purpose of this work was to investigate hull-detection algorithms used for preconditioning of the large and sparse linear system of equations that needs to be solved for pCT image reconstruction. The hull-detection algorithms investigated here included silhouette/space carving (SC), modified silhouette/space carving (MSC), and space modeling (SM). Each was compared to the cone-beam version of filtered backprojection (FBP) used for hull-detection. Data for testing these algorithms included simulated data sets of a digital head phantom and an experimental data set of a pediatric head phantom obtained with a pCT scanner prototype at Loma Linda University Medical Center. SC was the fastest algorithm, exceeding the speed of FBP by more than 100 times. FBP was most sensitive to the presence of noise. Ongoing work will focus on optimizing threshold parameters in order to define a fast and effic...

  11. 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.

  12. 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.

  13. 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

  14. 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.

  15. 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.

  16. 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.

  17. Distinguishing Off-Shell Supergravities With On-Shell Physics

    E-Print Network [OSTI]

    Neil D. Lambert; Gregory W. Moore

    2005-10-04T23:59:59.000Z

    We show that it is possible to distinguish between different off-shell completions of supergravity at the on-shell level. We focus on the comparison of the ``new minimal'' formulation of off-shell four-dimensional N=1 supergravity with the ``old minimal'' formulation. We show that there are 3-manifolds which admit supersymmetric compactifications in the new-minimal formulation but which do not admit supersymmetric compactifications in other formulations. Moreover, on manifolds with boundary the new-minimal formulation admits ``singleton modes'' which are absent in other formulations.

  18. 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.

  19. 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...

  20. Nonholonomic Ricci Flows and Running Cosmological Constant: I. 4D Taub-NUT Metrics

    E-Print Network [OSTI]

    Sergiu I. Vacaru; Mihai Visinescu

    2007-02-02T23:59:59.000Z

    In this work we construct and analyze exact solutions describing Ricci flows and nonholonomic deformations of four dimensional (4D) Taub-NUT spacetimes. It is outlined a new geometric techniques of constructing Ricci flow solutions. Some conceptual issues on spacetimes provided with generic off-diagonal metrics and associated nonlinear connection structures are analyzed. The limit from gravity/Ricci flow models with nontrivial torsion to configurations with the Levi-Civita connection is allowed in some specific physical circumstances by constraining the class of integral varieties for the Einstein and Ricci flow equations.

  1. 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...

  2. 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

  3. The Digital Library Shell Yael Dubinsky

    E-Print Network [OSTI]

    Yehudai, Amiram

    The Digital Library Shell Yael Dubinsky University of Rome "La Sapienza" Department of Computer Libraries The Digital Library (DL) Shell The project of development the DL shell Demonstration Summary and future work #12;3 Agenda Digital Libraries The Digital Library (DL) Shell The project of development

  4. 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 ...

  5. 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.

  6. 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...

  7. Convex Hulls of Varieties and Entanglement Measures Based on the Roof Construction

    E-Print Network [OSTI]

    Tobias J. Osborne

    2004-03-12T23:59:59.000Z

    In this paper we study the problem of calculating the convex hull of certain affine algebraic varieties. As we explain, the motivation for considering this problem is that certain pure-state measures of quantum entanglement, which we call polynomial entanglement measures, can be represented as affine algebraic varieties. We consider the evaluation of certain mixed-state extensions of these polynomial entanglement measures, namely convex and concave roofs. We show that the evaluation of a roof-based mixed-state extension is equivalent to calculating a hyperplane which is multiply tangent to the variety in a number of places equal to the number of terms in an optimal decomposition for the measure. In this way we provide an implicit representation of optimal decompositions for mixed-state entanglement measures based on the roof construction.

  8. 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

  9. 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.

  10. 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.

  11. 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.

  12. Past and future of grid shell structures

    E-Print Network [OSTI]

    Paoli, Céline (Céline 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 ...

  13. 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.

  14. 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

  15. On chaotic behavior of gravitating stellar shells

    E-Print Network [OSTI]

    M. V. Barkov; G. S. Bisnovatyi-Kogan; A. I. Neishtadt; V. A. Belinski

    2004-12-10T23:59:59.000Z

    Motion of two gravitating spherical stellar shells around a massive central body is considered. Each shell consists of point particles with the same specific angular momenta and energies. In the case when one can neglect the influence of gravitation of one ("light") shell onto another ("heavy") shell ("restricted problem") the structure of the phase space is described. The scaling laws for the measure of the domain of chaotic motion and for the minimal energy of the light shell sufficient for its escape to infinity are obtained.

  16. Cashew nut roasting: Chemical characterization of particulate matter and genotocixity analysis

    SciTech Connect (OSTI)

    Oliveira Galvão, Marcos Felipe de [Programa de Pós-Graduação em Bioquímica, Universidade Federal do Rio Grande do Norte, Natal, RN (Brazil); Melo Cabral, Thiago de; André, Paulo Afonso de [Departamento de Patologia, Universidade de São Paulo, São Paulo, SP (Brazil); Fátima Andrade, Maria de; Miranda, Regina Maura de [Departamento de Ciências Atmosféricas, Universidade de São Paulo, São Paulo, SP (Brazil); Saldiva, Paulo Hilário Nascimento [Departamento de Patologia, Universidade de São Paulo, São Paulo, SP (Brazil); Castro Vasconcellos, Pérola de [Instituto de Química, Universidade de São Paulo, São Paulo, SP (Brazil); Batistuzzo de Medeiros, Silvia Regina, E-mail: sbatistu@cb.ufrn.br [Departamento de Biologia Celular e Genética, CB – UFRN, Centro de Biociências, Universidade Federal do Rio Grande do Norte, Campus Universitário, Lagoa Nova, 59072-970, Natal, RN (Brazil)

    2014-05-01T23:59:59.000Z

    Background: Particulate matter (PM) is potentially harmful to health and related to genotoxic events, an increase in the number of hospitalizations and mortality from respiratory and cardiovascular diseases. The present study conducted the first characterization of elemental composition and polycyclic aromatic hydrocarbon (PAH) analysis of PM, as well as the biomonitoring of genotoxic activity associated to artisanal cashew nut roasting, an important economic and social activity worldwide. Methods: The levels of PM{sub 2.5} and black carbon were also measured by gravimetric analysis and light reflectance. The elemental composition was determined using X-ray fluorescence spectrometry and PAH analysis was carried out by gas chromatography–mass spectrometry. Genotoxic activity was measured by the Tradescantia pallida micronucleus bioassay (Trad-MCN). Other biomarkers of DNA damage, such as nucleoplasmic bridges and nuclear fragments, were also quantified. Results: The mean amount of PM{sub 2.5} accumulated in the filters (January 2124.2 µg/m{sup 3}; May 1022.2 µg/m{sup 3}; September 1291.9 µg/m{sup 3}), black carbon (January 363.6 µg/m{sup 3}; May 70 µg/m{sup 3}; September 69.4 µg/m{sup 3}) and concentrations of Al, Si, P, S, Cl, K, Ca, Ti, Cr, Mn, Fe, Ni, Cu, Zn, Se, Br and Pb were significantly higher than the non-exposed area. Biomass burning tracers K, Cl, and S were the major inorganic compounds found. Benzo[k]fluoranthene, indene[1,2,3-c,d]pyrene, benzo[ghi]perylene, phenanthrene and benzo[b]fluoranthene were the most abundant PAHs. Mean benzo[a]pyrene-equivalent carcinogenic power values showed a significant cancer risk. The Trad-MCN bioassay revealed an increase in micronucleus frequency, 2–7 times higher than the negative control and significantly higher in all the months analyzed, possibly related to the mutagenic PAHs found. Conclusions: This study demonstrated that artisanal cashew nut roasting is a serious occupational problem, with harmful effects on workers' health. Those involved in this activity are exposed to higher PM{sub 2.5} concentrations and to 12 PAHs considered potentially mutagenic and/or carcinogenic. The Trad-MCN with T. pallida was sensitive and efficient in evaluating the genotoxicity of the components and other nuclear alterations may be used as effective biomarkers of DNA damage. - Highlights: • The cashew nut roasting generated high concentrations of particulate matter fine. • The biomass burning tracers K, Cl, S were the major inorganic compounds found. • It was identified 12 PAHs considered to be potentially mutagenic and/or carcinogenic. • The genotoxic potential of this activity was confirmed by the Trad MCN assay. • This activity is a serious occupational problem with harmful effects to health workers.

  17. 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.

  18. 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.

  19. Scaling behavior in the convection-driven Brazil-nut effect

    E-Print Network [OSTI]

    Prakhyat Hejmady; Ranjini Bandyopadhyay; Sanjib Sabhapandit; Abhishek Dhar

    2012-11-22T23:59:59.000Z

    The Brazil-nut effect is the phenomenon in which a large intruder particle immersed in a vertically shaken bed of smaller particles rises to the top, even when it is much denser. The usual practice, while describing these experiments, has been to use the dimensionless acceleration \\Gamma=a \\omega^2/g, where a and \\omega are respectively the amplitude and the angular frequency of vibration and g is the acceleration due to gravity. Considering a vibrated quasi-two-dimensional bed of mustard seeds, we show here that the peak-to-peak velocity of shaking v= a\\omega, rather than \\Gamma, is the relevant parameter in the regime where boundary-driven granular convection is the main driving mechanism. We find that the rise-time \\tau of an intruder is described by the scaling law \\tau ~ (v-v_c)^{-\\alpha}, where v_c is identified as the critical vibration velocity for the onset of convective motion of the mustard seeds. This scaling form holds over a wide range of (a,\\omega), diameter and density of the intruder.

  20. 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.

  1. 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.

  2. Sandia National Laboratories: QD core shell heterostructures

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

    QD core shell heterostructures Introduction of Prof. David Kelley and UC Merced to SSLS On January 11, 2012, in Energy Efficiency, News, News & Events, Partnership, Solid-State...

  3. 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.

  4. 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.

  5. 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 für Kernphysik, Technische Universität 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.

  6. 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.

  7. 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

  8. 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.

  9. 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.

  10. 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.

  11. 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.

  12. 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:...

  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. 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...

  17. 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...

  18. Shell middle distillate hydrogenation process

    SciTech Connect (OSTI)

    Lucien, J.P. [Companie Rhenane de Raffinage Reichstett, Reichstett Vendenheim (France); Berg, J.P. van den; Hooijdonk, H.M.J.H. van; Thielemans, G.L.B. [Shell Internationale Petroleum Mij., The Hague (Netherlands); Germaine, G. [Shell Recherche SA, Grand-Couronne (France); Gjers, M. [Shell Raffinaderi AB, Gothenburg (Sweden)

    1994-12-31T23:59:59.000Z

    The strive towards cleaner environment has lead to low sulfur specifications for middle distillate fuels. In addition compositional specifications are presently debated. Thus, to meet future emissions standards regarding, specifically, particulates emissions, the motor industry calls for improved automotive gasoil quality. Although automotive gasoil quality affects emissions from diesel engines it is considered less influential than engine design and maintenance. Sulfur, density and cetane number are the fuel properties having the greatest influence on diesel engine emissions although also aromatics and endpoint specifications have been defined in environmentally adopted government initiatives. This paper reviews the options which are available to tackle these new requirements. The high severity single stage concept (using conventional mixed sulfides catalysts) will be discussed in its potential to meet more severe product requirements as well as in terms of its limitations, especially at the point of aromatics saturation and cetaine upgrading. Furthermore, it is shown that the option of severe hydrotreating followed by hydrogenation with conventional noble metal catalysts is preferred if deep aromatics saturation is aimed at. However, this conventional two stage concept has limitations with respect to heaviness and sulfur and nitrogen content of feedstocks. The new Shell Middle Distillate Hydrogenation (SMDH) technology, applying a (semi) two stage approach based on the Shell developed hydrogenation catalyst is presented. The SMDH process will be discussed in its potential to break the limitations of the conventional options. The new catalyst is crucial in this process and allows a highly integrated mode of operation. A number of applications of this novel process will be discussed.

  19. 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.

  20. A LAGRANGIAN-EULERIAN SHELL-FLUID COUPLING ALGORITHM BASED ON LEVEL

    E-Print Network [OSTI]

    Cirak, Fehmi

    is demonstrated with an airbag deployment simulation. Key words: shell, fluid, shell-fluid interaction, finite

  1. 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

  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. Wireless energy transfer between anisotropic metamaterials shells

    SciTech Connect (OSTI)

    Díaz-Rubio, Ana; Carbonell, Jorge; Sánchez-Dehesa, José, 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.

  5. Finite element analysis of shells with layers

    E-Print Network [OSTI]

    Hiller, Jean-François, 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 ...

  6. 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

  7. 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.

  8. 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.

  9. Traditional communities, multinationals and biodiversity: the example of an innovative partnership between the cosmetic firm Natura and the Brazil nut extractivists of So

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    between the cosmetic firm Natura and the Brazil nut extractivists of São Francisco in the Sustainable Studies Association, Rio de Janeiro, Brazil, June 11-14th , 2009. 1 halshs-00493592,version1-20Jun2010 Author manuscript, published in "LASA 2009 conference, Rion de janeiro : Brazil (2009)" #12;Abstract

  10. 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.

  11. 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.

  12. 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.

  13. Day 1 with PowerShell Things I wish I'd known when I started using PowerShell

    E-Print Network [OSTI]

    Cook, John D.

    on the subject. Set the execution policy PowerShell was designed from the beginning with security in mind. Power details.. At line:1 char:13 + .\\myScript.ps1 PowerShell launch faster When Microsoft releasedDay 1 with PowerShell Things I wish I'd known when I started using PowerShell John D. Cook http

  14. projet conjoint parrain par la Fondation Shell et Shell Gabon, des chercheurs de l'Institution

    E-Print Network [OSTI]

    Baker, Robert J.

    projet conjoint parrainé par la Fondation Shell et Shell Gabon, des chercheurs de l, le Cameroun et la Guinée-Équatoriale. Le pays est baigné par un climat tropical humide avec une'orientation par écholocation des Microchiroptères représente une adaptation évolutive unique à la vie nocturne

  15. 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

  16. 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.

  17. 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.

  18. 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

  19. 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 Core–Semiconductor Shell Nanowires Prepared bycarrier concentration in CIS shell at different depositionMerced Dissertation: Core/Shell Heterojunction Nanowires

  20. 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.

  1. Shell model description of Ge isotopes

    E-Print Network [OSTI]

    J. G. Hirsch; P. C. Srivastava

    2012-04-12T23:59:59.000Z

    A shell model study of the low energy region of the spectra in Ge isotopes for $38\\leq N\\leq 50$ is presented, analyzing the excitation energies, quadrupole moments, $B(E2)$ values and occupation numbers. The theoretical results have been compared with the available experimental data. The shell model calculations have been performed employing three different effective interactions and valence spaces.We have used two effective shell model interactions, JUN45 and jj44b, for the valence space $f_{5/2} \\, p \\,g_{9/2}$ without truncation. To include the proton subshell $f_{7/2}$ in valence space we have employed the $fpg$ effective interaction due to Sorlin {\\it et al.}, with $^{48}$Ca as a core and a truncation in the number of excited particles.

  2. 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.

  3. accumbens shell enhances: Topics by E-print Network

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

    A0o and B0o of the off-shell tachyons. Yi-Lei Tang 2015-01-30 72 NANO EXPRESS Open Access AuPd core-shell nanoparticles with varied hollow Energy Storage,...

  4. Au34-: A Fluxional Core-Shell Cluster. | EMSL

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

    Au34-: A Fluxional Core-Shell Cluster. Au34-: A Fluxional Core-Shell Cluster. Abstract: Among the large Aun – clusters for n > 20, the photoelectron spectra of Au34...

  5. 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 ...

  6. 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...

  7. accumbens shell mediates: Topics by E-print Network

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

    in type 0 theory. F. Cuomo; R. Marotta; F. Nicodemi; R. Pettorino; F. Pezzella; G. Sabella 2000-11-09 395 Department of Mechanical Engineering Spring 2011 Shell 2-Shell...

  8. Single shell tank waste characterization for Tank 241-BX-101

    SciTech Connect (OSTI)

    Kocher, K.L.

    1994-08-10T23:59:59.000Z

    This document provides the characterization information and interprets the data for Double-Shell Tank AP-102.

  9. 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.

  10. 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.

  11. 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...

  12. Vicinage effect in inner-shell ionization

    SciTech Connect (OSTI)

    Ugalde, J.M.; Sarasola, C.; Echenique, P.M.; Ritchie, R.H.

    1988-07-01T23:59:59.000Z

    The vicinage effect in the double ionization of inner-shell electrons has been calculated using first-order perturbation theory. Calculations demonstrate that significant differences arise when the orthogonalized hole in the electron gas is properly taken into account. Comparison with previous calculations by Basbas and Ritchie (Phys. Rev. A 25, 1943 (1982)) and experimental data is made.

  13. 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.

  14. 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.

  15. 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.

  16. 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.

  17. 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.

  18. 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.

  19. Interstellar HI Shells Identified in the SETHI Survey

    E-Print Network [OSTI]

    Sallmen, Shauna M; Bellehumeur, Brooke; Tennyson, Elizabeth M; Grunwald, Kurt; Lo, Cheuk Man

    2015-01-01T23:59:59.000Z

    Galactic HI (neutral hydrogen) shells are central to our understanding of the interstellar medium (ISM), which plays a key role in the development and evolution of galaxies, including our own. Several models involving supernovae and stellar winds have contributed to our broad understanding, but a complete, detailed picture remains elusive. To extend existing Galactic shell catalogs, we visually examined the SETHI (Search for Extraterrestrial HI) database to identify shell-like structures. This high-sensitivity 21-cm radio survey covering the Arecibo sky uniquely provides high-resolution data on shells at a wide range of Galactic latitudes. We present basic information (location, radial velocity, angular size, shape) for 74 previously unidentified HI shells. Due to limitations of coverage and data quality, and the biases inherent in search techniques, our catalog is not a complete sample of Galactic shells. We discuss the catalog completeness, and comment on the new shells' relationship with known interstellar...

  20. 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.

  1. 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.

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  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. 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.

  8. 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.

  9. 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.

  10. 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.

  11. 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.

  12. 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.

  13. Graded core/shell semiconductor nanorods and nanorod barcodes

    DOE Patents [OSTI]

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

    2009-05-19T23:59:59.000Z

    Disclosed herein is a graded core/shell semiconductor nanorod having at least a first segment of a core of a Group II-VI, Group III-V or a Group IV semiconductor, a graded shell overlying the core, wherein the graded shell comprises at least two monolayers, wherein the at least two monolayers each independently comprise a Group II-VI, Group III-V or a Group IV semiconductor.

  14. 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.

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

    E-Print Network [OSTI]

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

    2010-11-22T23:59:59.000Z

    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.

  16. 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.

  17. 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.

  18. Decoding Ancient Ocean Acidification Signals from Plankton Shells

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

    a type of zooplankton, do this by trapping trace chemical impurities in their calcium carbonate shells. Decoding these impurity records can reveal changes in global...

  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. 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.

  1. 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.

  2. 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.

  3. 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.

  4. 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

  5. Plasma Stabilization Conducting Shells and Their Impact on TBR and Activation in CLiFF Design

    E-Print Network [OSTI]

    California at Los Angeles, University of

    Mahmoud Z. Youssef, Hesham Khater*, and Mike Kotschenreuther** Mechanical and Aerospace Engineering is achieved by solid shells (e.g. Cu, Al, FS, W, V alloy). The adverse effect of this shell on TBR is highly in the different proposed shells. Tungsten shell produces the highest level of decay heat. A shell made of V alloy

  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. 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

    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 lucerne meal, the effectiveness of finely ground lucerne meal vs lucerne hay ad libitum was compared. Both forms of lucerne gave

  8. 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.

  9. 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

  10. 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

  11. 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.

  12. 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...

  13. 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

  14. 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.

  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. 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.

  17. 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.

  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. Packing of elastic wires in flexible shells

    E-Print Network [OSTI]

    Vetter, Roman; Herrmann, Hans J

    2015-01-01T23:59:59.000Z

    The packing problem of long thin filaments that are injected into confined spaces is of fundamental interest for physicists, biologists and materials engineers alike. How linear threads pack and coil is well known only for the ideal case of rigid containers, however. Here, we force long elastic rods into flexible spatial confinement borne by an elastic shell to examine under which conditions recently acquired knowledge on wire packing in rigid spheres breaks down. We find that unlike in rigid cavities, friction plays a key role by giving rise to the emergence of two distinct packing patterns. At low friction, the wire densely coils into an ordered toroidal bundle with semi-ellipsoidal cross section, while at high friction, it packs into a highly disordered, self-similar structure. These two morphologies are shown to be separated by a continuous phase transition.

  20. Packing of elastic wires in flexible shells

    E-Print Network [OSTI]

    Roman Vetter; Falk K. Wittel; Hans J. Herrmann

    2015-04-03T23:59:59.000Z

    The packing problem of long thin filaments that are injected into confined spaces is of fundamental interest for physicists, biologists and materials engineers alike. How linear threads pack and coil is well known only for the ideal case of rigid containers, however. Here, we force long elastic rods into flexible spatial confinement borne by an elastic shell to examine under which conditions recently acquired knowledge on wire packing in rigid spheres breaks down. We find that unlike in rigid cavities, friction plays a key role by giving rise to the emergence of two distinct packing patterns. At low friction, the wire densely coils into an ordered toroidal bundle with semi-ellipsoidal cross section, while at high friction, it packs into a highly disordered, self-similar structure. These two morphologies are shown to be separated by a continuous phase transition.

  1. A New CNT-Oriented Shell Theory

    E-Print Network [OSTI]

    Antonino Favata; Paolo Podio-Guidugli

    2011-04-05T23:59:59.000Z

    A theory of linearly elastic orthotropic shells is presented, with potential application to the continuous modeling of Carbon NanoTubes. Two relevant features are: the selected type of orthotropic response, which should be suitable to capture differences in chirality; the possibility of accounting for thickness changes due to changes in inter-wall separation to be expected in multi-wall CNTs. A simpler version of the theory is also proposed, in which orthotropy is preserved but thickness changes are excluded, intended for possible application to single-wall CNTs. Another feature of both versions of the present theory is boundary-value problems of torsion, axial traction, uniform inner pressure, and rim flexure, can be solved explicitly in closed form. Various directions of ongoing further research are indicated.

  2. 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.

  3. 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.

  4. 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...

  5. 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.

  6. 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.

  7. Dynamics of false vacuum bubbles: beyond the thin shell approximation

    E-Print Network [OSTI]

    Jakob Hansen; Dong-il Hwang; Dong-han Yeom

    2009-11-08T23:59:59.000Z

    We numerically study the dynamics of false vacuum bubbles which are inside an almost flat background; we assumed spherical symmetry and the size of the bubble is smaller than the size of the background horizon. According to the thin shell approximation and the null energy condition, if the bubble is outside of a Schwarzschild black hole, unless we assume Farhi-Guth-Guven tunneling, expanding and inflating solutions are impossible. In this paper, we extend our method to beyond the thin shell approximation: we include the dynamics of fields and assume that the transition layer between a true vacuum and a false vacuum has non-zero thickness. If a shell has sufficiently low energy, as expected from the thin shell approximation, it collapses (Type 1). However, if the shell has sufficiently large energy, it tends to expand. Here, via the field dynamics, field values of inside of the shell slowly roll down to the true vacuum and hence the shell does not inflate (Type 2). If we add sufficient exotic matters to regularize the curvature near the shell, inflation may be possible without assuming Farhi-Guth-Guven tunneling. In this case, a wormhole is dynamically generated around the shell (Type 3). By tuning our simulation parameters, we could find transitions between Type 1 and Type 2, as well as between Type 2 and Type 3. Between Type 2 and Type 3, we could find another class of solutions (Type 4). Finally, we discuss the generation of a bubble universe and the violation of unitarity. We conclude that the existence of a certain combination of exotic matter fields violates unitarity.

  8. 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

  9. Inverse Cascade Regime in Shell Models of 2-Dimensional Turbulence

    E-Print Network [OSTI]

    Thomas Gilbert; Victor S. L'vov; Anna Pomyalov; Itamar Procaccia

    2002-01-13T23:59:59.000Z

    We consider shell models that display an inverse energy cascade similar to 2-dimensional turbulence (together with a direct cascade of an enstrophy-like invariant). Previous attempts to construct such models ended negatively, stating that shell models give rise to a "quasi-equilibrium" situation with equipartition of the energy among the shells. We show analytically that the quasi-equilibrium state predicts its own disappearance upon changing the model parameters in favor of the establishment of an inverse cascade regime with K41 scaling. The latter regime is found where predicted, offering a useful model to study inverse cascades.

  10. 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.

  11. 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.

  12. Compton Scattering by a Pion and off--Shell Effects

    E-Print Network [OSTI]

    S. Scherer; H. W. Fearing

    1994-08-17T23:59:59.000Z

    We consider Compton scattering by a pion in the framework of chiral perturbation theory. We investigate off--shell effects in the s-- and u--channel pole diagrams. For that purpose we perform a field transformation which, in comparison with the standard Gasser and Leutwyler Lagrangian, generates additional terms at order $p^4$ proportional to the lowest--order equation of motion. As a result of the equivalence theorem the two Lagrangians predict the same Compton scattering S--matrix even though they generate different off--shell form factors. We conclude that off--shell effects are not only model--dependent but also representation--dependent.

  13. 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.

  14. 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.

  15. 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. Düllmann; M. Dworschak; M. Eibach; S. Eliseev; E. Haettner; F. Herfurth; F. P. Heßberger; S. Hofmann; J. Ketelaer; G. Marx; M. Mazzocco; D. Nesterenko; Yu. N. Novikov; W. R. Plaß; D. Rodríguez; 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 $N=152$.

  16. 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.

  17. Gross shell structure at high spin in heavy nuclei

    SciTech Connect (OSTI)

    Deleplanque, Marie-Agnes; Frauendorf, Stefan; Pashkevich, Vitaly V.; Chu, S.Y.; Unzhakova, Anja

    2003-10-07T23:59:59.000Z

    Experimental nuclear moments of inertia at high spins along the yrast line have been determined systematically and found to differ from the rigid-body values. The difference is attributed to shell effect and these have been calculated microscopically. The data and quantal calculations are interpreted by means of the semiclassical Periodic Orbit Theory. From this new perspective, features in the moments of inertia as a function of neutron number and spin, as well as their relation to the shell energies can be understood. Gross shell effects persist up to the highest angular momenta observed.

  18. 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

  19. 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

  20. Design and Test of Tube & Shell Heat Exchangers for Potential

    E-Print Network [OSTI]

    Design and Test of Tube & Shell Heat Exchangers for Potential OTEC Application Jeong-Tae Kwon1 University, South Korea 2Department of Mechanical Engineering, Sunmoon University, South Korea 3Offshore CCS

  1. 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.

  2. 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 ...

  3. 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.

  4. 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.

  5. Compressibility of Nuclear Matter from Shell Effects in Nuclei

    E-Print Network [OSTI]

    M. M. Sharma

    1999-04-13T23:59:59.000Z

    The compressibility of nuclear matter has received significant attention in the last decade and a variety of approaches have been employed to extract this fundamental property of matter. Recently, significant differences have emerged between the results of relativistic and non-relativistic calculations of breathing mode giant monopole resonance (GMR). This is due to a lack of understanding of the dynamics of GMR and of its exact relationship to the compression modulus of the infinite nuclear matter. Here, I present an alternative approach based upon nuclear shell effects. The shell effects are known to manifest experimentally in terms of particle-separation energies with an exceedingly high precision. Within the framework of the non-relativistic density-dependent Skyrme theory, it is shown that the compressibility of nuclear matter has a significant influence on shell effects in nuclei. It is shown that 2-neutron separation energies and hence the empirical shell effects can be used to constrain the compressibility of nuclear matter.

  6. Nonlinear analysis of smart composite plate and shell structures

    E-Print Network [OSTI]

    Lee, Seung Joon

    2005-08-29T23:59:59.000Z

    Theoretical formulations, analytical solutions, and finite element solutions for laminated composite plate and shell structures with smart material laminae are presented in the study. A unified third-order shear deformation theory is formulated...

  7. 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.

  8. 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.

  9. 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 ...

  10. 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.

  11. 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.

  12. Statistical techniques for characterizing residual waste in single-shell and double-shell tanks

    SciTech Connect (OSTI)

    Jensen, L., Fluor Daniel Hanford

    1997-02-13T23:59:59.000Z

    A primary objective of the Hanford Tank Initiative (HTI) project is to develop methods to estimate the inventory of residual waste in single-shell and double-shell tanks. A second objective is to develop methods to determine the boundaries of waste that may be in the waste plume in the vadose zone. This document presents statistical sampling plans that can be used to estimate the inventory of analytes within the residual waste within a tank. Sampling plans for estimating the inventory of analytes within the waste plume in the vadose zone are also presented. Inventory estimates can be used to classify the residual waste with respect to chemical and radiological hazards. Based on these estimates, it will be possible to make decisions regarding the final disposition of the residual waste. Four sampling plans for the residual waste in a tank are presented. The first plan is based on the assumption that, based on some physical characteristic, the residual waste can be divided into disjoint strata, and waste samples obtained from randomly selected locations within each stratum. The second plan is that waste samples are obtained from randomly selected locations within the waste. The third and fourth plans are similar to the first two, except that composite samples are formed from multiple samples. Common to the four plans is that, in the laboratory, replicate analytical measurements are obtained from homogenized waste samples. The statistical sampling plans for the residual waste are similar to the statistical sampling plans developed for the tank waste characterization program. In that program, the statistical sampling plans required multiple core samples of waste, and replicate analytical measurements from homogenized core segments. A statistical analysis of the analytical data, obtained from use of the statistical sampling plans developed for the characterization program or from the HTI project, provide estimates of mean analyte concentrations and confidence intervals on the mean. In addition, the statistical analysis provides estimates of spatial and measurement variabilities. The magnitude of these sources of variability are used to determine how well the inventory of the analytes in the waste have been estimated. This document provides statistical sampling plans that can be used to estimate the inventory of the analytes in the residual waste in single-shell and double-shell tanks and in the waste plume in the vadose zone.

  13. Direct Evidence of Washing out of Nuclear Shell Effects

    E-Print Network [OSTI]

    Chaudhuri, A; Banerjee, K; Bhattacharya, S; Sadhukhan, Jhilam; Bhattacharya, C; Kundu, S; Meena, J K; Mukherjee, G; Pandey, R; Rana, T K; Roy, P; Roy, T; Srivastava, V; Bhattacharya, P

    2015-01-01T23:59:59.000Z

    Constraining excitation energy at which nuclear shell effect washes out has important implications on the production of super heavy elements and many other fields of nuclear physics research. We report the fission fragment mass distribution in alpha induced reaction on an actinide target for wide excitation range in close energy interval and show direct evidence that nuclear shell effect washes out at excitation energy ~40 MeV. Calculation shows that second peak of the ?fission barrier also vanishes around similar excitation energy.

  14. 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.

  15. 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.

  16. Direct Evidence of Washing out of Nuclear Shell Effects

    E-Print Network [OSTI]

    A. Chaudhuri; T. K. Ghosh; K. Banerjee; S. Bhattacharya; Jhilam Sadhukhan; C. Bhattacharya; S. Kundu; J. K. Meena; G. Mukherjee; R. Pandey; T. K. Rana; P. Roy; T. Roy; V. Srivastava; P. Bhattacharya

    2015-04-17T23:59:59.000Z

    Constraining excitation energy at which nuclear shell effect washes out has important implications on the production of super heavy elements and many other fields of nuclear physics research. We report the fission fragment mass distribution in alpha induced reaction on an actinide target for wide excitation range in close energy interval and show direct evidence that nuclear shell effect washes out at excitation energy ~40 MeV. Calculation shows that second peak of the ?fission barrier also vanishes around similar excitation energy.

  17. Nanoscale Structures Relating to the Mechanical Properties of Abalone Shell

    E-Print Network [OSTI]

    Petta, Jason

    of Nacre 1. The nacreous layer of sea-shells is composed of 95 vol.% CaCO3, and 5% organic matrix (proteins of magnitude higher than monolithic CaCO3. The fracture toughness is comparable to that of modern ceramics. #12 Orthorhombic form of CaCO3 #12;Cross-section view of Abalone Shell Figures 1a and 1b: SEM Images of cross

  18. 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.

  19. 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.

  20. 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.

  1. Automatic Detection of Expanding HI Shells Using Artificial Neural Networks

    E-Print Network [OSTI]

    Anik Daigle; Gilles Joncas; Marc Parizeau; Marc-Antoine Miville-Deschenes

    2003-04-17T23:59:59.000Z

    The identification of expanding HI shells is difficult because of their variable morphological characteristics. The detection of HI bubbles on a global scale therefore never has been attempted. In this paper, an automatic detector for expanding HI shells is presented. The detection is based on the more stable dynamical characteristics of expanding shells and is performed in two stages. The first one is the recognition of the dynamical signature of an expanding bubble in the velocity spectra, based on the classification of an artificial neural network. The pixels associated with these recognized spectra are identified on each velocity channel. The second stage consists in looking for concentrations of those pixels that were firstly pointed out, and to decide if they are potential detections by morphological and 21-cm emission variation considerations. Two test bubbles are correctly detected and a potentially new case of shell that is visually very convincing is discovered. About 0.6% of the surveyed pixels are identified as part of a bubble. These may be false detections, but still constitute regions of space with high probability of finding an expanding shell. The subsequent search field is thus significantly reduced. We intend to conduct in the near future a large scale HI shells detection over the Perseus Arm using our detector.

  2. 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}.

  3. 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.

  4. A generalized shell for dynamic security analysis in operations planning

    SciTech Connect (OSTI)

    Marceau, R.J.; Mailhot, R.; Galiana, F.D. (McGill Univ., Montreal, Quebec (Canada))

    1993-08-01T23:59:59.000Z

    This paper introduces the concept of a generalized shell for performing power-system dynamic security analysis. The generalized shell mechanizes routines traditionally carried out by human experts and that are essential to power-system dynamic security analysis, thereby greatly accelerating the realization of complex processes. The shell semantics express high-level goals and tasks using a friendly, highly compact syntax which closely matches the language of operations planners. Typically, the shell will execute appropriate load-flow and transient-stability simulations (i.e. using commercially available simulation software), perform result analysis, make input changes and repeat this process until a user-defined goal has been achieved. A working shell prototype for performing key algorithmic processes is described and results of a typical sensitivity study are presented using a 700-bus model of the Hydro-Quebec network. It is expected that the prototype will reduce study-cycle time, improve the accuracy of dynamic security limits and, indeed, transform the working environment of operations and system planners. Eventually, it can be foreseen that the approach will gravitate towards supporting on-line dynamic security analysis.

  5. Shell Element Verification & Regression Problems for DYNA3D

    SciTech Connect (OSTI)

    Zywicz, E

    2008-02-01T23:59:59.000Z

    A series of quasi-static regression/verification problems were developed for the triangular and quadrilateral shell element formulations contained in Lawrence Livermore National Laboratory's explicit finite element program DYNA3D. Each regression problem imposes both displacement- and force-type boundary conditions to probe the five independent nodal degrees of freedom employed in the targeted formulation. When applicable, the finite element results are compared with small-strain linear-elastic closed-form reference solutions to verify select aspects of the formulations implementation. Although all problems in the suite depict the same geometry, material behavior, and loading conditions, each problem represents a unique combination of shell formulation, stabilization method, and integration rule. Collectively, the thirty-six new regression problems in the test suite cover nine different shell formulations, three hourglass stabilization methods, and three families of through-thickness integration rules.

  6. 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.

  7. 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.

  8. 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.

  9. 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.

  10. Low-Z Shell Pellet Experiments on DIII-D

    SciTech Connect (OSTI)

    Hollmann, E. M.; Yu, J. H. [University of California-San Diego, La Jolla, CA, 92093-0417 (United States); James, A. N.; Parks, P. B.; Evans, T. E.; Humphreys, D. A.; Jackson, G. L.; La Haye, R. J.; Strait, E. J.; West, W. P.; Wu, W. [General Atomics, PO Box 85608, San Diego, CA 92186-5608 (United States); Jernigan, T. C. [Oak Ridge National Laboratory, PO Box 2008, Oak Ridge, TN 37831 (United States)

    2009-09-10T23:59:59.000Z

    Small (o.d. = 1.8 mm, t = 0.37 mm) polystyrene shells filled with either pressurized argon gas or boron powder have been fired into DIII-D plasmas for disruption mitigation experiments. The pellet shells were observed to burn up at rhoapprox =0.5, roughly consistent with ablation rate calculations. Pellet slowing from 350 m/s down to 100 m/s was observed, which is not well-understood at present. Negligible plasma current contraction or MHD onset were seen as a result of the shell burn-up in the plasma edge, consistent with calculations. The pellet payloads were observed to ionize rapidly in the pellet vicinity (<1 cm radius) and rapid (<15 ms) mixing through the plasma core was observed.

  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. Double K-shell photoionization of atomic beryllium

    SciTech Connect (OSTI)

    Yip, F. L. [Departamento de Quimica, Modulo 13, Universidad Autonoma de Madrid, E-28049 Madrid (Spain); Martin, F. [Departamento de Quimica, Modulo 13, Universidad Autonoma de Madrid, E-28049 Madrid (Spain); Instituto Madrilen (tilde sign)o de Estudios Avanzados en Nanociencia, Cantoblanco, E-28049 Madrid (Spain); McCurdy, C. W. [Department of Chemistry, University of California, Davis, California 95616 (United States); Lawrence Berkeley National Laboratory, Chemical Sciences, and Ultrafast X-ray Science Laboratory, Berkeley, California 94720 (United States); Rescigno, T. N. [Lawrence Berkeley National Laboratory, Chemical Sciences, and Ultrafast X-ray Science Laboratory, Berkeley, California 94720 (United States)

    2011-11-15T23:59:59.000Z

    Double photoionization of the core 1s electrons in atomic beryllium is theoretically studied using a hybrid approach that combines orbital and grid-based representations of the Hamiltonian. The {sup 1} S ground state and {sup 1} P final state contain a double occupancy of the 2s valence shell in all configurations used to represent the correlated wave function. Triply differential cross sections are evaluated, with particular attention focused on a comparison of the effects of scattering the ejected electrons through the spherically symmetric valence shell with similar cross sections for helium, representing a purely two-electron target with an analogous initial-state configuration.

  13. 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).

  14. 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.

  15. Gravitational collapse with rotating thin shells and cosmic censorship

    E-Print Network [OSTI]

    Jorge V. Rocha

    2015-03-17T23:59:59.000Z

    Gravitational collapse of matter in the presence of rotation is a mostly unexplored topic but it might have important implications for cosmic censorship. Recently a convenient setup was identified to address this problem, by considering thin matter shells at the interface between two equal angular momenta Myers-Perry spacetimes in five dimensions. This note provides more details about the matching of such cohomogeneity-1 spacetimes and extends the results obtained therein to arbitrary higher odd dimensions. It is also pointed out that oscillatory orbits for shells in asymptotically flat spacetimes can be naturally obtained if the matter has a negative pressure component.

  16. 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

  17. 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.

  18. 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.

  19. 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 ...

  20. 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:...

  1. Shared and closed-shell O-O interactions in silicates. | EMSL

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

    Shared and closed-shell O-O interactions in silicates. Shared and closed-shell O-O interactions in silicates. Abstract: A chemical bond is an interaction that should be detectable...

  2. 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:...

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

    Open Energy Info (EERE)

    Tss4U BV formerly Holecsol R S Renewable Energy Systems and Shell Solar Energy Jump to: navigation, search Name: Tss4U BV (formerly Holecsol, R&S Renewable Energy Systems and Shell...

  4. 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...

  5. 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 ...

  6. 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...

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

    Energy Savers [EERE]

    78, No. 45 - March 7, 2013 Application from Shell Energy to export electric energy to Canada. Federal Register Notice. EA-339-A Shell Energy - CN.pdf More Documents & Publications...

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

    E-Print Network [OSTI]

    Reynolds, Paige Lea

    2002-01-01T23:59:59.000Z

    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 10³ S. typhimurium organisms. Initial experiments evaluated...

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

    E-Print Network [OSTI]

    Reynolds, Paige Lea

    2002-01-01T23:59:59.000Z

    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 10³ S. typhimurium organisms. Initial experiments evaluated...

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

    E-Print Network [OSTI]

    Lemos, José 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...

  11. 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 ...

  12. 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.

  13. 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.

  14. 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.

  15. A comparison of selected physical characteristics of brown and white shell eggs

    E-Print Network [OSTI]

    Washington, Cecily Lynn

    1982-01-01T23:59:59.000Z

    . . . ~ . . ~. . . ~ Factors That Affect Egg Quality. . . . Egg Shell Color. . . . ~ . . . . . . . . . . . . . . . ition. 3 12 20 34 43 CHAPTER III ' PROCEDURE~ . . . ~ . . . 46 Statistical Analysis 49 CHAPTER IV RESULTS AND DISCUSSION. . . . . . 50 Physical Egg... of ingredients and composition of the diet used in the experiment. 47 Table 2 ~ The zelationship between egg shell color and egg weight over 11 periods of production. . . . . ~ . . 52 Table 3. The relationship between egg shell color and egg shell...

  16. Characterization of Post-mortem Shell Alteration in Aransas Bay, Texas

    E-Print Network [OSTI]

    Schirm, David Edward

    2013-06-04T23:59:59.000Z

    , are exposure of the inner crystalline structure in irregular patches and the generation of groove marks in the shell (Figure 4B). 10 Physical alterations found in field deployed shells included peeling back of the periostracum (Figure 4C), cracking... time as did the amount of abrasion to the outside of the shell (Table 1). Amygdulum and Ischadium, the two species with nacreous aragonite shells, both experienced more cracking and peeling of outer layers compared to species with different...

  17. Single-shell tank interim stabilization project plan

    SciTech Connect (OSTI)

    Ross, W.E.

    1998-05-11T23:59:59.000Z

    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. This plan serves as the project executional baseline.

  18. Single Shell Tank (SST) Interim Stabilization Project Plan

    SciTech Connect (OSTI)

    VLADIMIROFF, D.T.; BOYLES, V.C.

    2000-05-22T23:59:59.000Z

    This project plan establishes the management framework for the conduct of the CHG Single-Shell Tank Interim Stabilization completion program. Specifically, this plan defines the mission needs and requirements; technical objectives and approach; organization structure, roles, responsibilities, and interfaces; and operational methods. This plan serves as the project executional baseline.

  19. Single shell tank sluicing history and failure frequency

    SciTech Connect (OSTI)

    HERTZEL, J.S.

    1998-11-10T23:59:59.000Z

    This document assesses the potential for failure of the single-shell tanks (SSTs) that are presumably sound and helps to establish the retrieval priorities for these and the assumed leakers. Furthermore, this report examines probabilities of SST failure as a function of age and operational history, and provides a simple statistical summary of historical leak volumes, leak rates, and corrosion factor.

  20. 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

  1. Generation of Core/shell Nanoparticles with Laser Ablation 

    E-Print Network [OSTI]

    Jo, Young Kyong

    2012-10-19T23:59:59.000Z

    Two types of core/shell nanoparticles (CS-NPs) generation based on laser ablation are developed in this study, namely, double pulse laser ablation and laser ablation in colloidal solutions. In addition to the study of the generation mechanism of CS...

  2. 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.

  3. 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.

  4. 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.

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

    E-Print Network [OSTI]

    E. Dikmen; O. Öztürk; 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.

  6. 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.

  7. 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.

  8. 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.

  9. Generation of Core/shell Nanoparticles with Laser Ablation

    E-Print Network [OSTI]

    Jo, Young Kyong

    2012-10-19T23:59:59.000Z

    Two types of core/shell nanoparticles (CS-NPs) generation based on laser ablation are developed in this study, namely, double pulse laser ablation and laser ablation in colloidal solutions. In addition to the study of the generation mechanism of CS...

  10. On the origin of two-shell supernova remnants

    E-Print Network [OSTI]

    V. V. Gvaramadze

    2007-12-27T23:59:59.000Z

    The proper motion of massive stars could cause them to explode far from the geometric centers of their wind-driven bubbles and thereby could affect the symmetry of the resulting diffuse supernova remnants. We use this fact to explain the origin of SNRs consisting of two partially overlapping shells (e.g. Cygnus Loop, 3C 400.2, etc.).

  11. 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.

  12. Dynamic Buckling and Recovery of Thin Cylindrical Shape Memory Shells

    E-Print Network [OSTI]

    Nemat-Nasser, Sia

    Dynamic Buckling and Recovery of Thin Cylindrical Shape Memory Shells Mahmoud Reza Amini and Sia@ucsd.edu Phone: (858) 534-6525 FAX: (858) 534-2727 Abstract Shape-memory alloys can sustain relatively large consisting of shape-memory alloys in order to understand the response when used as the core of the sandwich

  13. 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.

  14. 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 Hanford’s Double-Shell Tank Integrity Program.

  15. Single Shell Tank (SST) Retrieval Sequence FY 2000 Update

    SciTech Connect (OSTI)

    GARFIELD, J.S.

    2000-09-27T23:59:59.000Z

    This document describes the baseline single-shell tank (SST) waste retrieval sequence for the River Protection Project (RPP) updated for Fiscal Year 2000. The SST retrieval sequence identifies the proposed retrieval order (sequence), the tank selection and prioritization rationale, and planned retrieval dates for Hanford SSTs. In addition, the tank selection criteria and reference retrieval method for this sequence are discussed.

  16. 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

  17. 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

  18. 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

  19. 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

  20. 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

  1. 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

  2. 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

  3. GETTING STARTED WITH UNIX The Unix Shell: Working With A Command Line Interface

    E-Print Network [OSTI]

    Rudowsky, Ira

    GETTING STARTED WITH UNIX ROADMAP: · The Unix Shell: Working With A Command Line Interface · Standard Output · Command-Line Arguments · Redirecting Standard Output To A File · Displaying Files;THE UNIX SHELL: WORKING WITH A COMMAND-LINE-INTERFACE The Unix shell is a COMMAND-LINE-INTERFACE (CLI

  4. 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).

  5. 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.

  6. 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.

  7. 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.

  8. 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

  9. Decaying and kicked turbulence in a shell model

    E-Print Network [OSTI]

    Jan-Otto Hooghoudt; Detlef Lohse; Federico Toschi

    2000-12-06T23:59:59.000Z

    Decaying and periodically kicked turbulence are analyzed within the GOY shell model, to allow for sufficiently large scaling regimes. Energy is transfered towards the small scales in intermittent bursts. Nevertheless, mean field arguments are sufficient to account for the ensemble averaged energy decay E(t) \\~t^{-2} or the parameter dependences for the ensemble averaged total energy in the kicked case. Within numerical precision, the inertial subrange intermittency remains the same, whether the system is forced or decaying.

  10. 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.

  11. 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.

  12. 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 $U_q(\\hat{\\mathfrak{gl}}_N)$.

  13. 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.

  14. 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.

  15. 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.

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

    SciTech Connect (OSTI)

    Llovet, Xavier, E-mail: xavier@ccit.ub.edu [Centres Científics i Tecnològics, Universitat de Barcelona, Lluís Solé i Sabarís 1-3, 08028 Barcelona (Spain)] [Centres Científics i Tecnològics, Universitat de Barcelona, Lluís Solé i Sabarís 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 Física (ECM and ICC), Universitat de Barcelona, Diagonal 645, 08028 Barcelona (Spain)] [Facultat de Física (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.

  17. 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.

  18. 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.

  19. 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.

  20. 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.

  1. 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...

  2. 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.

  3. 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.

  4. 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.

  5. 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.

  6. 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.

  7. Dynamics of a thin shell in the Reissner-Nordstrom metric

    E-Print Network [OSTI]

    V. I. Dokuchaev; S. V. Chernov

    2010-02-24T23:59:59.000Z

    We describe the dynamics of a thin spherically symmetric gravitating shell in the Reissner-Nordstrom metric of the electrically charged black hole. The energy-momentum tensor of electrically neutral shell is modelled by the perfect fluid with a polytropic equation of state. The motion of a shell is described fully analytically in the particular case of the dust equation of state. We construct the Carter-Penrose diagrams for the global geometry of the eternal black hole, which illustrate all possible types of solutions for moving shell. It is shown that for some specific range of initial parameters there are possible the stable oscillating motion of the shell transferring it consecutively in infinite series of internal universes. We demonstrate also that this oscillating type of motion is possible for an arbitrary polytropic equation of state on the shell.

  8. Screening of the Reissner-Nordström 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. 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, Jürgen [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.

  12. 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.

  13. 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.

  14. Size-Dependent Specific Surface Area of Nanoporous Film Assembled by Core-Shell Iron Nanoclusters

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

    Antony, Jiji; Nutting, Joseph; Baer, Donald R.; Meyer, Daniel; Sharma, Amit; Qiang, You

    2006-01-01T23:59:59.000Z

    Nanoporous films of core-shell iron nanoclusters have improved possibilities for remediation, chemical reactivity rate, and environmentally favorable reaction pathways. Conventional methods often have difficulties to yield stable monodispersed core-shell nanoparticles. We produced core-shell nanoclusters by a cluster source that utilizes combination of Fe target sputtering along with gas aggregations in an inert atmosphere at7?C. Sizes of core-shell iron-iron oxide nanoclusters are observed with transmission electron microscopy (TEM). The specific surface areas of the porous films obtained from Brunauer-Emmett-Teller (BET) process are size-dependent and compared with the calculated data.

  15. 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.

  16. 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.

  17. 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.

  18. 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...

  19. 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 *...

  20. Fifteenth international conference on X-ray and inner-shell processes

    SciTech Connect (OSTI)

    Not Available

    1990-01-01T23:59:59.000Z

    This document is composed of Abstracts from invited papers presented at X-90, the fifteenth annual international conference on x-ray and Inner-Shell Processes. (FSD)

  1. 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.

  2. 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.

  3. 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.

  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. Evolution of a vacuum shell in the Friedman-Schwarzschild world

    E-Print Network [OSTI]

    V. I. Dokuchaev; S. V. Chernov

    2008-08-29T23:59:59.000Z

    The method of an effective potential is used to investigate the possible types of evolution of vacuum shells in the Friedman-Schwarzschild world. Such shells are assumed to emerge during phase transitions in the early Universe. The possible global geometries are constructed for the Friedman- Schwarzschild worlds. Approximate solutions to the equation of motion of a vacuum shell have been found. The conditions under which the end result of the evolution of the vacuum shells under consideration is the formation of black holes and wormholes with baby universes inside have been found. The interior of this world can be a closed, flat, or open Friedman universe.

  6. A Critical "Dimension" in a Shell Model for Turbulence

    E-Print Network [OSTI]

    Paolo Giuliani; Mogens H. Jensen; Victor Yakhot

    2001-02-08T23:59:59.000Z

    We investigate the GOY shell model within the scenario of a critical dimension in fully developed turbulence. By changing the conserved quantities, one can continuously vary an ``effective dimension'' between $d=2$ and $d=3$. We identify a critical point between these two situations where the flux of energy changes sign and the helicity flux diverges. Close to the critical point the energy spectrum exhibits a turbulent scaling regime followed by a plateau of thermal equilibrium. We identify scaling laws and perform a rescaling argument to derive a relation between the critical exponents. We further discuss the distribution function of the energy flux.

  7. Spherical thin-shell wormholes and modified Chaplygin gas

    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)

    2013-05-01T23:59:59.000Z

    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 [19].

  8. "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.

  9. 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.

  10. 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.

  11. FLAMMABLE GAS DIFFUSION THROUGH SINGLE SHELL TANK (SST) DOMES

    SciTech Connect (OSTI)

    MEACHAM, J.E.

    2003-11-10T23:59:59.000Z

    This report quantified potential hydrogen diffusion through Hanford Site Single-Shell tank (SST) domes if the SSTs were hypothetically sealed airtight. Results showed that diffusion would keep headspace flammable gas concentrations below the lower flammability limit in the 241-AX and 241-SX SST. The purpose of this document is to quantify the amount of hydrogen that could diffuse through the domes of the SSTs if they were hypothetically sealed airtight. Diffusion is assumed to be the only mechanism available to reduce flammable gas concentrations. The scope of this report is limited to the 149 SSTs.

  12. 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.

  13. 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.

  14. 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

  15. 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 Néel/CNRS-Université J. Fourier and CEA Grenoble, INAC, SP2M, 17 rue des Martyrs, 38 054 Grenoble (France)] [CEA-CNRS Group Nanophysique et Semiconducteurs, Institut Néel/CNRS-Université 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.

  16. 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.

  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. 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.

  19. 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.

  20. 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 has been developed to synthesize Au/Pd core-shell nanoparticles via galvanic replacement of Cu by Pd on hollow Au nanospheres. The unique nanoparticles were characterized by X-ray diffraction, X

  1. Observation of tearing mode deceleration and locking due to eddy currents induced in a conducting shell

    E-Print Network [OSTI]

    Fitzpatrick, Richard

    Observation of tearing mode deceleration and locking due to eddy currents induced in a conducting eddy currents induced by the rotating mode in the conducting shell surrounding the plasma. According to the amplitude of the mode.4­7 According to this theory, eddy currents induced in the conducting shell

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

    E-Print Network [OSTI]

    C. Özen; Y. Alhassid; H. Nakada

    2015-01-22T23:59:59.000Z

    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.

  3. Off-shell BRST-VSUSY superalgebra for D=4 BF theories in the superconnection formalism

    E-Print Network [OSTI]

    Aidaoui, A

    2006-01-01T23:59:59.000Z

    We propose the superconnection formalism to construct the off-shell BRST-VSUSY superalgebra for D=4 BF theories. The method is based on the natural introduction of physical fields as well as auxiliary fields via superconnections and their associated supercurvatures defined on a superspace. We also give a prescription to build the off-shell BRST-VSUSY exact quantum action.

  4. Off-shell BRST-VSUSY superalgebra for D=4 BF theories in the superconnection formalism

    E-Print Network [OSTI]

    A. Aidaoui; M. Tahiri

    2006-07-13T23:59:59.000Z

    We propose the superconnection formalism to construct the off-shell BRST-VSUSY superalgebra for D=4 BF theories. The method is based on the natural introduction of physical fields as well as auxiliary fields via superconnections and their associated supercurvatures defined on a superspace. We also give a prescription to build the off-shell BRST-VSUSY exact quantum action.

  5. 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.

  6. 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...

  7. 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.

  8. 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.

  9. Department of Mechanical Engineering Spring 2012 Shell Eco-marathon Team 1

    E-Print Network [OSTI]

    Demirel, Melik C.

    PENNSTATE Department of Mechanical Engineering Spring 2012 Shell Eco-marathon Team 1 Overview For our senior design project, we were assigned to the Shell Eco-marathon Team 1 project. At the beginning equivalent (mpge), and the Prototype should achieve over 4000 mpge. Research awards that the teams would

  10. 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

  11. 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.

  12. Geometrodynamics of a thin shell in the Reissner-Nordström 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-Nordström 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.

  13. 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.

  14. 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

  15. 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).

  16. REPRODUCTIVE CYCLE OF THE SOFT-SHELL CLAM, MYA ARENARIA, AT SKAGIT BAY, WASHINGTON

    E-Print Network [OSTI]

    'll Skagit Bay in northern Puget Sound. Wash. Spawning occurred from late May to early September in both 1971 the annual reproductive cycle for a soft-shell clam population from Puget Sound, Wash. Skagit Bay-shell clams in Puget Sound. DESCRIPTION OF AREA Skagit Bay, Wash., is located in northern Puget Sound 60 miles

  17. Black Ge Based on Crystalline/Amorphous Core/Shell Nanoneedle Arrays

    E-Print Network [OSTI]

    Javey, Ali

    Black Ge Based on Crystalline/Amorphous Core/Shell Nanoneedle Arrays Yu-Lun Chueh,,§,|,# Zhiyong, ROC ABSTRACT Direct growth of black Ge on low-temperature substrates, including plastics and rubber is reported. The material is based on highly dense, crystalline/amorphous core/shell Ge nanoneedle arrays

  18. 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.

  19. 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

  20. SUBDIVISION SURFACES: A NEW PARADIGM FOR THIN-SHELL FINITE-ELEMENT ANALYSIS

    E-Print Network [OSTI]

    Desbrun, Mathieu

    SUBDIVISION SURFACES: A NEW PARADIGM FOR THIN-SHELL FINITE-ELEMENT ANALYSIS Fehmi Cirak1 , Michael for thin-shell finite-element analysis based on the use of subdivision surfaces for: i) describing by subdivision are H2 and, consequently, have a finite Kirchhoff-Love energy. The resulting finite elements

  1. SAFETY EVALUATION OF THE SINGLE SHELL TANKS (SST) MODIFIED SLUICING WASTE RETRIEVAL SYSTEM

    SciTech Connect (OSTI)

    SMITH, R.D.

    2003-09-01T23:59:59.000Z

    The purpose of this safety evaluation is to determine if the potential risk associated with using the single-shell tank modified sluicing system for retrieval of the 100-series Single-Shell Tanks (SSTs) in the tank farms is adequately addressed and bounded by the current tank farms safety basis documented safety analysis and to determine if additional controls may be required.

  2. Identifying Product Scaling Principles

    E-Print Network [OSTI]

    Perez, Angel 1986-

    2011-06-02T23:59:59.000Z

    shelling machines A. Manual nut cracker (Faqs, 2010), B. Electric nut cracker (Lemfgco, 2010), C. Production shelling machine (Biodiesel-machine, 2010) ................................................................................ 25 Figure 6: A..., 2010) ............................................................. 29 Figure 8: Examples ?change energy source? A. Mechanical nutcracker powered by the user (Faqs, 2010), B. Conversion to an electric production shelling machine (Biodiesel...

  3. 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.

  4. Comparison of different disinfectants on egg shell microbial populations and evaluation of microbial levels in commercial egg processing facilities

    E-Print Network [OSTI]

    Knape, Koyle Dean

    2000-01-01T23:59:59.000Z

    practice to effectively reduce surface contamination. The disinfection of the egg shell surface is a very important strategy for maintaining shell cleanliness (Ayers et al, 1967). There are a number of experimental sanitizing methods now available...

  5. 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.

  6. Fully microscopic shell-model calculations with realistic effective hamiltonians

    E-Print Network [OSTI]

    L. Coraggio; A. Covello; A. Gargano; N. Itaco; T. T. S. Kuo

    2011-01-24T23:59:59.000Z

    The advent of nucleon-nucleon potentials derived from chiral perturbation theory, as well as the so-called V-low-k approach to the renormalization of the strong short-range repulsion contained in the potentials, have brought renewed interest in realistic shell-model calculations. Here we focus on calculations where a fully microscopic approach is adopted. No phenomenological input is needed in these calculations, because single-particle energies, matrix elements of the two-body interaction, and matrix elements of the electromagnetic multipole operators are derived theoretically. This has been done within the framework of the time-dependent degenerate linked-diagram perturbation theory. We present results for some nuclei in different mass regions. These evidence the ability of realistic effective hamiltonians to provide an accurate description of nuclear structure properties.

  7. 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.

  8. Double shell slurry low-temperature corrosion tests

    SciTech Connect (OSTI)

    Divine, J.R.; Bowen, W.M.; McPartland, S.A.; Elmore, R.P.; Engel, D.W.

    1983-09-01T23:59:59.000Z

    A series of year-long tests have been completed on potential double shell slurry (DSS) compositions at temperatures up to 100/sup 0/C. These tests have sought data on uniform corrosion, pitting, and stress-corrosion cracking. No indication of the latter two types of corrosion were observed within the test matrix. Corrosion rates after four months were generally below the 1 mpy (25 ..mu..m/y) design limit. By the end of twelve months all results were below this limit and, except for very concentrated mixtures, all were below 0.5 mpy. Prediction equations were generated from a model fitted to the data. The equations provide a rapid means of estimating the corrosion rate for proposed DSS compositions.

  9. 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.

  10. Fully microscopic shell-model calculations with realistic effective hamiltonians

    E-Print Network [OSTI]

    Coraggio, L; Gargano, A; Itaco, N; Kuo, T T S

    2011-01-01T23:59:59.000Z

    The advent of nucleon-nucleon potentials derived from chiral perturbation theory, as well as the so-called V-low-k approach to the renormalization of the strong short-range repulsion contained in the potentials, have brought renewed interest in realistic shell-model calculations. Here we focus on calculations where a fully microscopic approach is adopted. No phenomenological input is needed in these calculations, because single-particle energies, matrix elements of the two-body interaction, and matrix elements of the electromagnetic multipole operators are derived theoretically. This has been done within the framework of the time-dependent degenerate linked-diagram perturbation theory. We present results for some nuclei in different mass regions. These evidence the ability of realistic effective hamiltonians to provide an accurate description of nuclear structure properties.

  11. Thermal behavior of localized surface plasmon resonance of Au/TiO2 core/shell nanoparticle arrays

    E-Print Network [OSTI]

    Thermal behavior of localized surface plasmon resonance of Au/TiO2 core/shell nanoparticle arrays/shell nanoparticle arrays. Thermal annealing is carried out in three different routes, i.e., pre-TiO2 annealing, post various metallic nanostructures, core/shell nanoparticles exhibit high LSPR tunability and ap- plicability

  12. 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 Inâ??es Cavero­Pelâ??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

  13. Platinum Monolayer on IrFe Core–Shell 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.

  14. Facile approach to prepare hollow core–shell 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 core–shell structure NiO (HCS–NiO) 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 core–shell spheres. On the basis of the analysis of the composition and the morphology, a possible formation mechanism was investigated. NiO microspheres with hollow core–shell 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 core–shell NiO material in fabricating a wide range of high-performance electrochemical supercapacitors. - The hollow core–shell 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 core–shell NiO via a novel and facile precipitation route. • Exhibited uniform feature sizes and high surface area of hollow core–shell 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 charge–discharge cycles.

  15. 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.

  16. 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.

  17. 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.

  18. MHD computation of feedback of resistive-shell instabilities in the reversed field pinch

    SciTech Connect (OSTI)

    Zita, E.J.; Prager, S.C. (Wisconsin Univ., Madison, WI (United States). Plasma Physics Research); Ho, Y.L.; Schnack, D.D (Science Applications International Corp., San Diego, CA (United States))

    1992-05-01T23:59:59.000Z

    MHD computation demonstrates that feedback can sustain reversal and reduce loop voltage in resistive-shell reversed field pinch (RFP) plasmas. Edge feedback on {approximately}2R/a tearing modes resonant near axis is found to restore plasma parameters to nearly their levels with a close-fitting conducting shell. When original dynamo modes are stabilized, neighboring tearing modes grow to maintain the RFP dynamo more efficiently. This suggests that experimentally observed limits on RFP pulselengths to the order of the shell time can be overcome by applying feedback to a few helical modes.

  19. 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.

  20. 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.

  1. 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.

  2. 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...

  3. 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.

  4. 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.

  5. 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.

  6. 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

    . 4 67. 9 68. 0a 67. 2a 66. 8b 63 9 69 0 70. 1 66. 9cde 61. 6 g 55. 78 68, 3 72. 6 a, b Shell color means in each row followed by different letters differ significantly (P~0. 05). c, d, e, f, g ' Period means followed by different letters... OF CONTENTS Page ABSTRACT ACKNOWLEDGEMENTS TABLE OF CONTENTS Vl. LIST OF TABLES CHAPTER I. INTRODUCTION CHAPTER II. LITERATURE REVIEW Shell quality Interior quality Proximate composition Selected nutritional characteristics Shell color 3 5 8 10...

  7. 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.

  8. 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.

  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. 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.

  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. 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.

  16. 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.

  17. 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...

  18. Exchange bias in Core-Shell Iron-Iron Oxide Nanoclusters. | EMSL

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

    oxide (Fe-Fe3O4) nanoclusters (NCs) of size 11 nm and 14 nm carrying a different core to shell ratio. NCs show complicated behaviors due to competition between interfacial...

  19. 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 ...

  20. 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

    width dependent study of Solar Cell parameters Mott-SchotkyCore/Shell NW based solar cells and NIR photodetectors. Thep-n heterojunction NW solar cells and detailed study of the

  1. Modeling analysis of core-shell Si/SiGe nanowires

    E-Print Network [OSTI]

    Tang, Ming Y., 1979-

    2004-01-01T23:59:59.000Z

    (cont.) a composition that results in a high mobility has a very promising thermoelectric performance. Lastly, the thermoelectric-related transport properties for a Si/SiGe core-shell nanowire are compared with the related ...

  2. 2.081J / 16.230J Plates and Shells, Spring 2006

    E-Print Network [OSTI]

    Wierzbicki, Tomasz

    This course explores the following topics: derivation of elastic and plastic stress-strain relations for plate and shell elements; the bending and buckling of rectangular plates; nonlinear geometric effects; post-buckling ...

  3. Bimagnetic Core/Shell FePt/Fe3O4 Nanoparticles

    E-Print Network [OSTI]

    Wang, Zhong L.

    and H2S.11,12 Procedures leading to novel inorganic core/shell structures with controlled dimensions nanoparticles, FePt and Fe3O4, followed by reduc- tive annealing to remove organic surfactant around each

  4. 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

  5. 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.

  6. 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...

  7. Coiled tubing deployed ESP works well for Shell in North Sea field

    SciTech Connect (OSTI)

    Watkins, P. [Centrilift, Aberdeen (United Kingdom); Stewart, D.

    1996-06-01T23:59:59.000Z

    What is believed to be the world`s first offshore coiled tubing deployed ESP system was installed by Centrilift, a Division of Baker Hughes Ltd., on Shell Expro`s Auk field Alpha platform in March 1995. After one year, the system is working well and is now viewed as a major step forward in alternative deployment methods for ESPs. Basic features of the system and project background are overviewed here. Shell U.K. Exploration and Production (Expro) operates in the UK Sector of the North Sea on behalf of Shell and Esso. Centrilift worked closely with Shell on this high-profile project and is active on several others, all aimed at reducing the operator`s cost for installing ESPs by using alternative deployment methods.

  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. 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.

  11. 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.

  12. No stellar age gradient inside supergiant shell LMC 4

    E-Print Network [OSTI]

    Jochen M. Braun; Dominik J. Bomans; Jean-Marie Will; Klaas S. de Boer

    1997-08-08T23:59:59.000Z

    The youngest stellar populations of a 'J'-shaped region (400 pc strip E-W across LH 77 and 850 pc S-N) inside the supergiant shell (SGS) LMC 4 (with a diameter of 1.4 kpc) have been analysed with CCD photometry in B,V passbands. Isochrone fitting to the colour-magnitude diagrams yields ages in the range from 9 Myr to 16 Myr without correlation with the distance to the LMC 4 centre. We construct the luminosity function and the mass function of five regions to ensure that projection effects don't mask the results. The slopes lie in the expected range (gamma in [0.22;0.41] and Gamma in [-1.3;-2.4] respectively, with the Salpeter value of Gamma = -1.35). After our calculations a total of 5-7 10^3 supernovae has dumped the energy of 10^54.5 erg over the past 10 Myr into LMC 4, in fact enough to tear the original star-forming cloud apart in the time span between 5 and 8 Myr after the starformation burst, initiated by a large scale triggering event. We conclude that LMC 4 can have been formed without a contribution from stochastic self-propagating star formation (SSPSF).

  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. 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.

  16. 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.

  17. Depth dependent dynamics in the hydration shell of a protein

    E-Print Network [OSTI]

    J. Servantie; C. Atilgan; A. R. Atilgan

    2010-07-31T23:59:59.000Z

    We study the dynamics of hydration water/protein association in folded proteins, using lysozyme and myoglobin as examples. Extensive molecular dynamics simulations are performed to identify underlying mechanisms of the dynamical transition that corresponds to the onset of amplified atomic fluctuations in proteins. The number of water molecules within a cutoff distance of each residue scales linearly with protein depth index and is not affected by the local dynamics of the backbone. Keeping track of the water molecules within the cutoff sphere, we observe an effective residence time, scaling inversely with depth index at physiological temperatures while the diffusive escape is highly reduced below the transition. A depth independent orientational memory loss is obtained for the average dipole vector of the water molecules within the sphere when the protein is functional. While below the transition temperature, the solvent is in a glassy state, acting as a solid crust around the protein, inhibiting any large scale conformational fluctuations. At the transition, most of the hydration shell unfreezes and water molecules collectively make the protein more flexible.

  18. 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...

  19. 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 $^...

  20. Improving the Performance of a Two-Shell Column with Advanced Control

    E-Print Network [OSTI]

    Morrison, T. A.; Laflamme, D.

    IMPROVING THE PERFORMANCE OF A TWO-SHELL COLUMN WITH ADVANCED CONTROL TIMOTHY A. MORRISON SENIOR PROJECT ENGINEER SETPOINT Inc. Houston, Texas ABSTRACT Application of advanced control techniques to a two-shell, two- pressure distillation... column has yielded stable operation with reduced utility consumption and increased capacity. Prior to the application of advanced controls this column was a plant capacity limit and composition control was very difficult. The advanced controls now...

  1. Evaluation of discontinuity stresses in thick walled cylindrical shells by means of an embedded polariscope

    E-Print Network [OSTI]

    Cano, Narciso Ortiz

    1968-01-01T23:59:59.000Z

    EVALUATION OF DISCONTINUITY STRESSES IN THICK WALLED CYLINDRICAL SHELLS BY MEANS OF AN EMBEDDED POLARISCOPE A Thesis By NARCISO ORTIZ CANO, JR. Submitted to the Graduate College of the Texas A&M University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE January, 196B Major Sub)ect: Aerospace Engineering EVALUATION OF DISCONTINUITY STRESSES IN THICK WALLED CYLINDRICAL SHELLS BY MEANS OF AN EMBEDDED POLARISCOPE A Thesis By NARCISO ORTIZ CANO, JR. Approved...

  2. 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.

  3. A Review of "Oral Culture and Catholicism in Early Modern England" by Alison Shell

    E-Print Network [OSTI]

    Landrum, Robert

    2009-01-01T23:59:59.000Z

    reviews 123 Alison Shell. Oral Culture and Catholicism in Early Modern England. Cambridge: Cambridge University Press, 2007. xiv + 244 pp. $95.00. Review by robert landrum, university of south carolina beaufort. In Oral Culture and Catholicism... in Early Modern England Alison Shell assigns herself an ambitious task, to assess the impact of post-Refor- mation Catholicism on England?s oral culture. It is an investigation of a persecuted and deliberately opaque subculture through the use...

  4. 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.

  5. 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.

  6. 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.

  7. 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)

  8. 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.

  9. 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.

  10. Review of technologies for the pretreatment of retrieved single-shell tank waste at Hanford

    SciTech Connect (OSTI)

    Gerber, M.A.

    1992-08-01T23:59:59.000Z

    The purpose of the study reported here was to identify and evaluate innovative processes that could be used to pretreat mixed waste retrieved from the 149 single-shell tanks (SSTs) on the US Department of Energy`s (DOE) Hanford site. The information was collected as part of the Single Shell Tank Waste Treatment project at Pacific Northwest Laboratory (PNL). The project is being conducted for Westinghouse Hanford Company under their SST Disposal Program.

  11. He proton spectra for diagnosing shell R and fuel Ti of imploded capsules at OMEGA

    E-Print Network [OSTI]

    D­3 He proton spectra for diagnosing shell R and fuel Ti of imploded capsules at OMEGA C. K. Li, D the first use of 14.7 MeV deuterium­helium3 (D­3 He) proton spectra for diagnosing shell areal density ( R the conditions achieved by these implosions, we utilize, in large part, the 14.7 MeV protons generated from D­3

  12. 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.}

  13. 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.

  14. Modifying yolk fatty acid composition to improve the health quality of shell eggs

    E-Print Network [OSTI]

    Van Elswyk, Mary Elizabeth

    1990-01-01T23:59:59.000Z

    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...

  15. 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.

  16. 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.

  17. 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.

  18. Dual shell pressure balanced reactor vessel. Final project report

    SciTech Connect (OSTI)

    Robertus, R.J.; Fassbender, A.G.

    1994-10-01T23:59:59.000Z

    The Department of Energy`s Office of Energy Research (OER) has previously provided support for the development of several chemical processes, including supercritical water oxidation, liquefaction, and aqueous hazardous waste destruction, where chemical and phase transformations are conducted at high pressure and temperature. These and many other commercial processes require a pressure vessel capable of operating in a corrosive environment where safety and economy are important requirements. Pacific Northwest Laboratory (PNL) engineers have recently developed and patented (U.S. patent 5,167,930 December 1, 1992) a concept for a novel Dual Shell Pressure Balanced Vessel (DSPBV) which could solve a number of these problems. The technology could be immediately useful in continuing commercialization of an R&D 100 award-winning technology, Sludge-to-oil Reactor System (STORS), originally developed through funding by OER. Innotek Corporation is a small business that would be one logical end-user of the DSPBV reactor technology. Innotek is working with several major U.S. engineering firms to evaluate the potential of this technology in the disposal of wastes from sewage treatment plants. PNL entered into a CRADA with Innotek to build a bench-scale demonstration reactor and test the system to advance the economic feasibility of a variety of high pressure chemical processes. Hydrothermal processing of corrosive substances on a large scale can now be made significantly safer and more economical through use of the DSPBV. Hydrothermal chemical reactions such as wet-air oxidation and supercritical water oxidation occur in a highly corrosive environment inside a pressure vessel. Average corrosion rates from 23 to 80 miles per year have been reported by Rice (1994) and Latanision (1993).

  19. 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. Grévy; G. F. Grinyer; H. Iwasaki; E. Khan; T. Kröll; 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.

  20. 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.

  1. Tank characterization report for Single-Shell Tank T-102

    SciTech Connect (OSTI)

    Remund, K.M.; Hartley, S.A.; Toth, J.J.; Tingey, J.M.; Heasler, P.G.; Ryan, F.M.; Simpson, B.C.

    1994-09-01T23:59:59.000Z

    Tank 241-T-102 (hereafter referred to as T-102) is a 530,000 gallon single-shell waste tank located in the 200 West T Tank farm at the Hanford Site. In 1993, two cores were taken from this tank and analysis of the cores was conducted by Battelle`s 325-A Laboratory. Characterization of the waste in this tank was conducted to support Hanford Federal Facility Agreement and Consent Order (Tri-Party Agreement) Milestone M-44-05. Tank T-102 was constructed in 1943 and put into service in 1945; it is the second tank in a cascade system with Tanks T-101 and T-103. During its process history, Tank T-102 received mostly Metal Waste (MW) from the Bismuth Phosphate Process and Coating Waste (CW) from the REDOX Process via the cascade from Tank T-101 and in transfers from Tank C-102. In 1956, the MW was removed from T-102 by pumping and sluicing`. This tank was declared inactive and retired from service in 1976. In 1981, intrusion prevention and stabilization measures were taken to isolate the waste in T-102. The tank presently contains approximately 121,100 liters (32,000 gallons) of liquid and sludge-like waste. Historically, there are no unreviewed safety issues associated with this tank and none were revealed after reviewing the data from the latest core sampling event in 1993. An extensive set of analytical measurements was performed on the core composites. The major constituents (>0.5 wt%) of the waste are water, aluminum, sodium, iron, and nitrate, ordered from the largest concentration to the smallest. The concentrations and inventories of these and other constituents are given. The results of the chemical analyses have been compared to the dangerous waste codes in the Washington Dangerous Waste Regulations (WAC 173-303).

  2. 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...

  3. 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?=?1–2 transitions in F- through Li-like Ti ions in the 4400–4800?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}?=?400–600?eV and N{sub e}?=?3.0–10.0?×?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.

  4. 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.

  5. 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.

  6. 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.

  7. 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.

  8. 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...

  9. Fe{sub 3}O{sub 4} and CdS based bifunctional core–shell 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 core–shell 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 core–shell structures advantageously combine magnetic as well as fluorescence response with a tendency towards self-organization.

  10. 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.

  11. Discovery of Non-Thermal X-Rays from the Shell of RCW86

    E-Print Network [OSTI]

    Aya Bamba; Katsuji Koyama; Hiroshi Tomida

    2000-08-16T23:59:59.000Z

    We report the ASCA (Advanced Satellite for Cosmology and Astrophysics) results of RCW 86, a shell-like supernova remnant (SNR). The bright region in the X-ray band traces the radio clumpy shell, although details of the structure are different. The X-ray spectrum from each part of the shell can not be fitted to a thin thermal plasma model, but requires, at least three components: a low temperature plasma of 0.3 keV, high temperature plasma of > several keV, and a power-law component with a photon index = 3. The abundances of O, Ne, Mg and Si are significantly higher than that of Fe, indicating that RCW 86 is a type II SNR. The absorption column of 3e21 H cm^-2 indicates the distance to the SNR to be several kpc. The power-law component can be interpreted to be synchrotron radiation of high energy electrons. Assuming energy density equipartition between the magnetic field and the electrons, and using the radio and X-ray spectra, we argue that high energy electrons are accelerated up to 20 TeV. The acceleration efficiency is, however, different from shell to shell.

  12. 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.

  13. 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.

  14. 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.

  15. Liquid immiscibility and core-shell morphology formation in ternary Al–Bi–Sn 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 Al–Bi–Sn alloys were investigated. Three types of morphology, the core-shell type, the stochastic droplet type and uniform dispersion type, of Al–Bi–Sn particles prepared by a jet breakup process were distinguished, and the relationships between which were discussed. The phase transformation behaviors of the Al–Bi–Sn 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 Al–Bi–Sn 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 Sn–Bi-rich solder shell, showing promise for application as high-density electronic packaging materials. - Highlights: • The liquid demixing, morphology and microstructure in Al–Bi–Sn 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/Sn–Bi core-shell particles show promise for use in electronic packaging.

  16. 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.

  17. 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].

  18. 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...

  19. Preliminary design requirements document for the initial single-shell tank retrieval system

    SciTech Connect (OSTI)

    Hertzel, J.S., Westinghouse Hanford

    1996-07-24T23:59:59.000Z

    The scope of this Preliminary Design Requirements Document is to identify and define the functions, with associated requirements, which must be performed to demonstrate and accomplish the initial single-shell tank saltcake retrieval from selected tanks. This document sets forth functions, requirements, performance requirements and design constraints necessary to begin conceptual design for the Initial Single-shell Tank Retrieval System. System and physical interfaces between the Initial Single-shell Tank Retrieval System project and the Tank Waste Remediation are identified. The constraints, performance requirements, and transfer of information and data across a technical interface will be documented in an Interface Control Document. The design requirements provided in this document will be augmented by additional detailed design to be documented by the project.

  20. 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.

  1. 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.

  2. 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.

  3. Diffusive Shock Acceleration of Electrons and Radio Emission from Large Diameter Shell-Type Supernova Remnants

    E-Print Network [OSTI]

    A. I. Asvarov

    2000-01-21T23:59:59.000Z

    In present study I examine the capability of diffusive shock acceleration mechanism to explain existing data on radio emission from evolved large diameter shell-type adiabatic supernova remnants (SNRs). Time-dependent ''onion-shell'' model for the radio emission of SNRs is developed, which is based on the assumptions: a) acceleration takes place from thermal energies and test-particle approximation is valid; b) the problem of injection is avoided by introducing, like Bell (1978), two injection parameters; c) to take into consideration very late stages of SNR evolution the analytic approximation of Cox and Andersen (1982) for the shell structure is used; c)no radiative cooling. Constructed Surface Brightness - Diameter $(\\Sigma -D)$ tracks are compared with the empirical $\\Sigma -D$ diagram. The main conclusion of the study is that the DSA mechanism is capable of explaining all the statistics of radio SNRs including very large diameter remnants and giant galactic loops.

  4. 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.

  5. 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.

  6. 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.

  7. Inverse scattering J-matrix approach to nucleon-nucleus scattering and the shell model

    E-Print Network [OSTI]

    A. M. Shirokov; A. I. Mazur; J. P. Vary; E. A. Mazur

    2008-10-06T23:59:59.000Z

    The $J$-matrix inverse scattering approach can be used as an alternative to a conventional $R$-matrix in analyzing scattering phase shifts and extracting resonance energies and widths from experimental data. A great advantage of the $J$-matrix is that it provides eigenstates directly related to the ones obtained in the shell model in a given model space and with a given value of the oscillator spacing $\\hbar\\Omega$. This relationship is of a particular interest in the cases when a many-body system does not have a resonant state or the resonance is broad and its energy can differ significantly from the shell model eigenstate. We discuss the $J$-matrix inverse scattering technique, extend it for the case of charged colliding particles and apply it to the analysis of $n\\alpha$ and $p\\alpha$ scattering. The results are compared with the No-core Shell Model calculations of $^5$He and $^5$Li.

  8. 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.

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

    SciTech Connect (OSTI)

    Ferracin, Paolo

    2008-05-19T23:59:59.000Z

    Shell-based support structures are being fabricated and tested as part of the development of large-aperture Nb{sub 3}Sn superconducting quadrupoles for future upgrades of the LHC Interaction Regions. These structures utilize water pressurized bladders for room-temperature pre-load control, and rely on a pre-tensioned aluminum shell to deliver a substantial part of the coil pre-stress during cool-down. The coil final pre-load is therefore monotonically approached from below, without overstressing the strain-sensitive conductor. This method has been adopted by the US LARP collaboration to test subscale racetrack coils (SQ series), 1 m long cos-theta coils (TQS series), and 4 m long magnets (LRS and LQS series). We present recent progress in the development of shell-based support structures, with a description of the principles of operations and the future plans.

  10. 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.

  11. 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.

  12. A Compact Circumstellar Shell as the Source of High--velocity Features in SN 2011fe

    E-Print Network [OSTI]

    Mulligan, Brian W

    2015-01-01T23:59:59.000Z

    High--velocity features (HVF), especially of Ca II, are frequently seen in Type Ia supernovae observed prior to B-band maximum (Bmax). These HVF start at more than 25,000 km/s in the days after first light, and slow to about 18,000 km/s near Bmax. To recreate the Ca II near-infrared triplet (CaNIR) HVF in SN 2011fe, we consider the interaction between a Type Ia supernova and a compact circumstellar shell, employing a hydrodynamic 1-D simulation using FLASH. We generate synthetic spectra from the hydrodynamic results using syn++. We show that the CaNIR HVF and its velocity evolution is better explained by a supernova model interacting with a shell than a model without a shell, and briefly discuss the implications for progenitor models.

  13. 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.

  14. Numerical simulations of multi-shell plasma twisters in the solar atmosphere

    E-Print Network [OSTI]

    Murawski, K; Musielak, Z E; Dwivedi, B N

    2015-01-01T23:59:59.000Z

    We perform numerical simulations of impulsively generated Alfv\\'en waves in an isolated photospheric flux tube, and explore the propagation of these waves along such magnetic structure that extends from the photosphere, where these waves are triggered, to the solar corona, and analyze resulting magnetic shells. Our model of the solar atmosphere is constructed by adopting the temperature distribution based on the semi-empirical model and specifying the curved magnetic field lines that constitute the magnetic flux tube which is rooted in the solar photosphere. The evolution of the solar atmosphere is described by 3D, ideal magnetohydrodynamic equations that are numerically solved by the FLASH code. Our numerical simulations reveal, based on the physical properties of the multi-shell magnetic twisters and the amount of energy and momentum associated with them, that these multi-shell magnetic twisters may be responsible for the observed heating of the lower solar corona and for the formation of solar wind. Moreov...

  15. 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).

  16. 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.

  17. 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.

  18. 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.

  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. Shell-Filling Effect in the Entanglement Entropies of Spinful Fermions

    E-Print Network [OSTI]

    Fabian H. L. Essler; Andreas M. Läuchli; Pasquale Calabrese

    2012-11-11T23:59:59.000Z

    We consider the von Neumann and R\\'enyi entropies of the one dimensional quarter-filled Hubbard model. We observe that for periodic boundary conditions the entropies exhibit an unexpected dependence on system size: for L=4 mod 8 the results are in agreement with expectations based on conformal field theory, while for L=0 mod 8 additional contributions arise. We explain this observation in terms of a shell-filling effect, and develop a conformal field theory approach to calculate the extra term in the entropies. Similar shell filling effects in entanglement entropies are expected to be present in higher dimensions and for other multicomponent systems.