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  1. CONVERGENCE ANALYSIS FOR ANDERSON ACCELERATION ALEX TOTH

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

    CONVERGENCE ANALYSIS FOR ANDERSON ACCELERATION ALEX TOTH ∗ AND C. T. KELLEY ∗ Abstract. Anderson(m) is a method for acceleration of fixed point iteration which stores m + 1 prior evaluations of the fixed point map and computes the new iteration as a linear combination of those evalu- ations. Anderson(0) is fixed point iteration. In this paper we show that Anderson(m) is locally r-linearly convergent if the fixed point map is a contraction and the coefficients in the linear combination remain

  2. Browse by Discipline -- E-print Network Subject Pathways: Environmenta...

    Office of Scientific and Technical Information (OSTI)

    - Finnish Forest Research Institute Toor, Saqib (Saqib Toor) - Department of Energy Technology, Aalborg University Go back to Individual Researchers Collections: A B C D E F G H I...

  3. Search for: All records | SciTech Connect

    Office of Scientific and Technical Information (OSTI)

    Mustafayev, Azar (11) Huang, Peisi (10) Bae, Kyu Jung (8) Mickelson, Dan (7) Balazs, Csaba ... radiatively-driven naturalness Bae, Kyu Jung ; Baer, Howard ; Nagata, Natsumi ; Serce, ...

  4. Spin wave eigenmodes in single and coupled sub-150 nm rectangular...

    Office of Scientific and Technical Information (OSTI)

    ...anni.carlotti@fisica.unipg.it ; Madami, M. 1 ; Tacchi, S. 2 ; Gubbiotti, G. ; Dey, H. ; Csaba, G. ; Porod, W. 3 + Show Author Affiliations Dipartimento di Fisica e Geologia, ...

  5. Browse by Discipline -- E-print Network Subject Pathways: Mathematics --

    Office of Scientific and Technical Information (OSTI)

    Energy, science, and technology for the research community -- hosted by the Office of Scientific and Technical Information, U.S. Department of Energy U V W X Y Z Tesfatsion, Leigh (Leigh Tesfatsion) - Departments of Economics & Mathematics, Iowa State University Tinsley, Matt (Matt Tinsley) - School of Biological and Environmental Sciences, University of Stirling Toor, Saqib (Saqib Toor) - Department of Energy Technology, Aalborg University Tsao, Tsu-Chin (Tsu-Chin Tsao) - Mechanical and

  6. Browse by Discipline -- E-print Network Subject Pathways: Materials Science

    Office of Scientific and Technical Information (OSTI)

    -- Energy, science, and technology for the research community -- hosted by the Office of Scientific and Technical Information, U.S. Department of Energy G H I J K L M N O P Q R S T U V W X Y Z Faber, Ted (Ted Faber) - Information Sciences Institute, University of Southern California Fábián, Csaba I. (Csaba I. Fábián) - Institute of Mathematics, Eötvös Loránd University Fabrikant, Alex (Alex Fabrikant) - Department of Computer Science, Princeton University Fabrikant, Sara Irina (Sara

  7. Presentation Poster: A One- Dimensional Analysis of Anderson

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

    A One- Dimensional Analysis of Anderson Acceleration for Coupled Neutronic and Thermal Hydraulic Calculations in a Light Water Reactor Alex R. Toth North Carolina State University...

  8. CASL-U-2015-0257-000 Anderson

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    7-000 Anderson Acceleration for Tiamat Alexander Toth, Tim Kelley North Carolina State University Roger Pawlowki Sandia National Laboratory July 7, 2015 CASL-U-2015-0257-000...

  9. Revised Manuscript

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

    K.S. Toth, Phys. Rev. C3 (1971) 1444 1971GA44 A. Garcia, J. Milio and F. Senent, An. Fisica 67 (1971) 175 1971GE12 H.V. Geramb, Phys. Lett. B37 (1971) 351 1971GO1E Goldfarb,...

  10. mai2144.tmp

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

    ,- . ., . -.:'ew- . *.. ... la LawrenceBerkeleyLaboratory UNIVERSITY OF CALIFORNIA Physics Division Presented at the Wingspread International C& ference on Fifty Years 'of Weak Interactions.: From the Fermi Theory to-the W (Intermediate Vector Boson Conference), Racifie', WI, May 29-Jutie 1; 1984' THE DISCOVERY OF CHARM G. Goldhaber November 1984 00 NOT MICROFIL~ COVER . . . ~: . .. ..'...... ".:. . . . . : ..".... Prepared for the U.S. Department of Energy under Contract

  11. CASL-U-2015-0181-000

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

    1-000 Analysis of Anderson Acceleration on a Simplified Neutronics/Thermal Hydraulics System Alexander Toth and C. T. Kelley North Carolina State University Stuart Slattery, Steven Hamilton, and Kevin Clarno Oak Ridge National Laboratory April 19, 2015 CASL-U-2015-0181-000 ANS MC2015 - Joint International Conference on Mathematics and Computation (M&C), Supercomputing in Nuclear Applications (SNA) and the Monte Carlo (MC) Method * Nashville, Tennessee * April 19-23, 2015, on CD-ROM, American

  12. The Secretary of Energy'

    Office of Legacy Management (LM)

    :c> 2" ' $,,. I ,- ; ' . The Secretary of Energy' 0 "-. Washington. bC 20585 ._. . . October 10, 1997 ' \ . : ' . Y' . -. - The Honorable Wdliam S. Cohen " Smetary ofDefense Washington, D.C. 20301 .' .&r Mr. Secretary: f : ,~The' Congress recently sent to,the ,President' for signature the Energy and Water Development Appropriations Act, 1998., ;Among other provisions, ,this bi would immediately transfer responsibility for the Formerly~Utilized Sites Remedial Action Program

  13. Inspection of Power Purchase Contracts at the Western Area Power Administration, IG-0372

    Office of Environmental Management (EM)

    IG-1 INFORMATION: Report on the "Inspection of Power Purchase Contracts at the Western Area Power Administration" TO:The Secretary BACKGROUND: The subject final report is provided for your information. The Office of Inspector General received an allegation regarding possible irregularities in certain power purchase contracts awarded by the Western Area Power Administration. Based on our survey of Western's power purchase procedures, we expanded our allegation based inquiry to include

  14. C'

    Office of Legacy Management (LM)

    C' 1 W" .-- ,, Department of Energy ' Washington, DC 20585 ' ( . . . ,, ., :, ' , QErJ i ;;' jgg4 . : The Honorable Edward Rendell 'City Hall 'Philadelphia, Pennsylvania,- i9107 Dear Mayor Rendell': : Secretary of Energy' Hazel D'Leary.has'announced. a new approach to openness 'in, the Department of Energy,(DOE) and its communications with the #public; ..In support of this initiative, we are pleased to forward the enclolsed information related to'.the former Catalytic Co.' site in your

  15. The,Honorable kenneth EL Reeves

    Office of Legacy Management (LM)

    Department of Energy. ' . Washington, DC 2058s i ,' ' . : -' ' . The,Honorable kenneth EL Reeves 795 Massachusetts. Avenue Cambridge, Massachusetts 02139 .( Dear Mayor Reeves: ., Secretary of Energy Hazel jO!Leary'has announced a new.approach to openness in the Department of 'Energy (DOE) and its communications with' the.publ:ic. In.. support ,of this initiative, we are pleased to forward the enclosed information related to,the Massachusetts Institute of Technology site,in your jurisdiction'

  16. PPPL's Earth Week features Colloquium on NYC green plan, cleanup and

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

    awards | Princeton Plasma Physics Lab PPPL's Earth Week features Colloquium on NYC green plan, cleanup and awards By Jeanne Jackson DeVoe April 28, 2014 Tweet Widget Google Plus One Share on Facebook Volunteers clean up the area outside PPPL's Lyman Spitzer Building during the Earth Day cleanup at PPPL on April 22. From left to right: Virginia Finley, Julia Toth, Bill Davis, Glenn Anderson and Shannon Greco. (Photo by Elle Starkman/PPPL Office of Communications) Volunteers clean up the area

  17. Secretary Chu's Remarks at a Batteries Announcement in North Carolina |

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

    Department of Energy a Batteries Announcement in North Carolina Secretary Chu's Remarks at a Batteries Announcement in North Carolina August 5, 2009 - 12:00am Addthis I want to thank President Toth and everyone here at Polypore's Celgard subsidiary for welcoming me today. It is always a pleasure to be with the innovators and entrepreneurs who are rebuilding this economy from the ground up. Your work here at Celgard not only powers our computers, cameras, and cars - it will power our future

  18. Journal Cover Stories

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

    NatureCoverLarge.png High-quality electron beams from a laser wakefield accelerator using plasma-channel guiding September 30, 2004 | Author(s): C. G. R. Geddes, Cs. Toth, J. van Tilborg, E. Esarey, C. B. Schroeder, D. Bruhwiler, C. Nieter, J. Cary & W. P. Leemans | Source: Nature | Category: Fusion Energy | URL: http://dx.doi.org/10.1038/nature02900 Download Image: NatureCoverLarge.png | png | 2.7 MB 30 September 2004, Vol. 431, pp. 541-544 PhysTodayCoverLarge.png Integrated Simulation of

  19. PROJECT PROFILE: PowerScout (Incubator 10) | Department of Energy

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

    PowerScout (Incubator 10) PROJECT PROFILE: PowerScout (Incubator 10) Awardee Name: PowerScout Project Title: PowerScout.com, The First Big Data Enabled eCommerce Platform for Clean Energy Funding Opportunity: SunShot Technology to Market (Incubator 10) SunShot Subprogram: Technology to Market Location: Pleasanton, CA Amount Awarded: $1,500,000 Awardee Cost Share: $1,500,000 Project Investigator: Attila Toth PowerScout.com is a data-driven eCommerce platform for clean energy. PowerScout's

  20. Dear Mayor Riley: I

    Office of Legacy Management (LM)

    ~. Washington, DC 20585 ' . . aaAq 3 .A , Tbs %z;y;bl& &r& Ri!ey !llll Brookshire Avenue Downey, California 90247 ' Dear Mayor Riley: I Secretary of.Energy Hazel O!.Leary has announced a new approach, to openness in the Department of Energy (DOE) and its communications with the pubTic. In support of this initiative, we are pleased to forward the enclosed 'info'rmation related to:the former North American Aviation site in your jurisdiction that performed work for DOE or its

  1. The Honorable Alfred,Del Vecchio

    Office of Legacy Management (LM)

    Alfred,Del Vecchio 255 MainStreet White Plains, New'York ib601 DearMayor Del. Vecchio: 1 \' '. Secretary of Energy Hazel O'Leary has announced a new approach to openness in, -the Department of,Energy (DOE) and hits communications'with'the 'support:of this.'initiative, we are pleased, to' forward the enclosed related to,the former Nuclear Developme,nt Corp. of ,America site in ': jurisdiction that performed work for DOE's predecessor agencies. * information is provided for your information,'use,

  2. The Honorable Richard M. Daley,. Jr. 121 N.. LaSalle Street

    Office of Legacy Management (LM)

    Pepartment of Energy Washington, DC 20585 FEB 24 1995 The Honorable Richard M. Daley,. Jr. 121 N.. LaSalle Street Chicago, Illinoi~s 60602 Dear Mayor Daley:. Secretary of Energy Hazel O'Leary has announced a new approach.to openness in the Department.of Energy (DOE) and its communicationswith the public. In . support of this initiative, we are,pleased to.forward the enclosed information related to,the former Wyckoff Steel Co. site in your jurisdiction that performed work for DDE or its

  3. Power System Extreme Event Detection: The VulnerabilityFrontier

    SciTech Connect (OSTI)

    Lesieutre, Bernard C.; Pinar, Ali; Roy, Sandip

    2007-10-17

    In this work we apply graph theoretic tools to provide aclose bound on a frontier relating the number of line outages in a gridto the power disrupted by the outages. This frontier describes theboundary of a space relating the possible severity of a disturbance interms of power disruption, from zero to some maximum on the boundary, tothe number line outages involved in the event. We present the usefulnessof this analysis with a complete analysis of a 30 bus system, and presentresults for larger systems.

  4. Frequency dependent thermal expansion in binary viscoelasticcomposites

    SciTech Connect (OSTI)

    Berryman, James G.

    2007-12-01

    The effective thermal expansion coefficient beta* of abinary viscoelastic composite is shown to be frequency dependent even ifthe thermal expansion coefficients beta A and beta B of both constituentsare themselves frequency independent. Exact calculations for binaryviscoelastic systems show that beta* is related to constituent valuesbeta A, beta B, volume fractions, and bulk moduli KA, KB, as well as tothe overall bulk modulus K* of the composite system. Then, beta* isdetermined for isotropic systems by first bounding (or measuring) K* andtherefore beta*. For anisotropic systems with hexagonal symmetry, theprincipal values of the thermal expansion beta*perp and beta*para can bedetermined exactly when the constituents form a layered system. In allthe examples studied, it is shown explicitly that the eigenvectors of thethermoviscoelastic system possess non-negative dissipation -- despite thecomplicated analytical behavior of the frequency dependent thermalexpansivities themselves. Methods presented have a variety ofapplications from fluid-fluid mixtures to fluid-solid suspensions, andfrom fluid-saturated porous media to viscoelastic solid-solidcomposites.

  5. Measurement of the nue and Total 8B Solar Neutrino Fluxes with theSudbury Neutrino Observatory Phase I Data Set

    SciTech Connect (OSTI)

    Aharmim, B.; Ahmad, Q.R.; Ahmed, S.N.; Allen, R.C.; Andersen,T.C.; Anglin, J.D.; Buehler, G.; Barton, J.C.; Beier, E.W.; Bercovitch,M.; Bergevin, M.; Bigu, J.; Biller, S.D.; Black, R.A.; Blevis, I.; Boardman, R.J.; Boger, J.; Bonvin, E.; Boulay, M.G.; Bowler, M.G.; Bowles, T.J.; Brice, S.J.; Browne, M.C.; Bullard, T.V.; Burritt, T.H.; Cameron, J.; Chan, Y.D.; Chen, H.H.; Chen, M.; Chen, X.; Cleveland, B.T.; Cowan, J.H.M.; Cowen, D.F.; Cox, G.A.; Currat, C.A.; Dai, X.; Dalnoki-Veress, F.; Davidson, W.F.; Deng, H.; DiMarco, M.; Doe, P.J.; Doucas, G.; Dragowsky, M.R.; Duba, C.A.; Duncan, F.A.; Dunford, M.; Dunmore, J.A.; Earle, E.D.; Elliott, S.R.; Evans, H.C.; Ewan, G.T.; Farine, J.; Fergani, H.; Ferraris, A.P.; Fleurot, F.; Ford, R.J.; Formaggio, J.A.; Fowler, M.M.; Frame, K.; Frank, E.D.; Frati, W.; Gagnon,N.; Germani, J.V.; Gil, S.; Goldschmidt, A.; Goon, J.T.M.; Graham, K.; Grant, D.R.; Guillian, E.; Hahn, R.L.; Hallin, A.L.; Hallman, E.D.; Hamer, A.S.; Hamian, A.A.; Handler, W.B.; Haq, R.U.; Hargrove, C.K.; Harvey, P.J.; Hazama, R.; Heeger, K.M.; Heintzelman, W.J.; Heise, J.; Helmer, R.L.; Henning, R.; Hepburn, J.D.; Heron, H.; Hewett, J.; Hime,A.; Howard, C.; Howe, M.A.; Huang, M.; Hykawy, J.G.; Isaac, M.C.P.; Jagam, P.; Jamieson, B.; Jelley, N.A.; Jillings, C.; Jonkmans, G.; Kazkaz, K.; Keener, P.T.; Kirch, K.; Klein, J.R.; Knox, A.B.; Komar,R.J.; Kormos, L.L.; Kos, M.; Kouzes, R.; Krueger, A.; Kraus, C.; Krauss,C.B.; Kutter, T.; Kyba, C.C.M.; Labranche, H.; Lange, R.; Law, J.; Lawson, I.T.; Lay, M.; Lee, H.W.; Lesko, K.T.; Leslie, J.R.; Levine, I.; Loach, J.C.; Locke, W.; Luoma, S.; Lyon, J.; MacLellan, R.; Majerus, S.; Mak, H.B.; Maneira, J.; Marino, A.D.; Martin, R.; McCauley, N.; McDonald,A.B.; McDonald, D.S.; McFarlane, K.; McGee, S.; McGregor, G.; MeijerDrees, R.; Mes, H.; Mifflin, C.; Miknaitis, K.K.S.; Miller, M.L.; Milton,G.; Moffat, B.A.; Monreal, B.; Moorhead, M.; Morrissette, B.; Nally,C.W.; Neubauer, M.S.; et al.

    2007-02-01

    This article provides the complete description of resultsfrom the Phase I data set of the Sudbury Neutrino Observatory (SNO). ThePhase I data set is based on a 0.65 kt-year exposure of heavy water tothe solar 8B neutrino flux. Included here are details of the SNO physicsand detector model, evaluations of systematic uncertainties, andestimates of backgrounds. Also discussed are SNO's approach tostatistical extraction of the signals from the three neutrino reactions(charged current, neutral current, and elastic scattering) and theresults of a search for a day-night asymmetry in the ?e flux. Under theassumption that the 8B spectrum is undistorted, the measurements fromthis phase yield a solar ?e flux of ?(?e) =1.76+0.05?0.05(stat.)+0.09?0.09 (syst.) x 106 cm?2 s?1, and a non-?ecomponent ?(? mu) = 3.41+0.45?0.45(stat.)+0.48?0.45 (syst.) x 106 cm?2s?1. The sum of these components provides a total flux in excellentagreement with the predictions of Standard Solar Models. The day-nightasymmetry in the ?e flux is found to be Ae = 7.0 +- 4.9 (stat.)+1.3?1.2percent (sys.), when the asymmetry in the total flux is constrained to bezero.

  6. Plasma and Ion Assistance in Physical Vapor Deposition: AHistorical Perspective

    SciTech Connect (OSTI)

    Anders, Andre

    2007-02-28

    Deposition of films using plasma or plasma-assist can betraced back surprisingly far, namely to the 18th century for arcs and tothe 19th century for sputtering. However, only since the 1960s thecoatings community considered other processes than evaporation for largescale commercial use. Ion Plating was perhaps the first importantprocess, introducing vapor ionization and substrate bias to generate abeam of ions arriving on the surface of the growing film. Ratherindependently, cathodic arc deposition was established as an energeticcondensation process, first in the former Soviet Union in the 1970s, andin the 1980s in the Western Hemisphere. About a dozen various ion-basedcoating technologies evolved in the last decades, all characterized byspecific plasma or ion generation processes. Gridded and gridless ionsources were taken from space propulsion and applied to thin filmdeposition. Modeling and simulation have helped to make plasma and ionseffects to be reasonably well understood. Yet--due to the complex, oftennon-linear and non-equilibrium nature of plasma and surfaceinteractions--there is still a place for the experience plasma"sourcerer."

  7. Acceptance for Beneficial Use for the 100K Service Water Pumps Auto Start Modifications Project 1K-97-3466M

    SciTech Connect (OSTI)

    MULLER, F.J.

    2000-03-27

    This Acceptance for Beneficial Use checklist covers the modifications to the K Basins service water pumps that added an auto-start function for reliability of the fire suppression system. The following information is to document the Acceptance for Beneficial Use (ABU) with a checklist and supporting information. The service water pumps have been modified so that on low system pressure after a time delay, the standby pump will automatically start. This ABU checklist matrix indicates the organizations that are responsible for the preparation of --or for the provision of input to--the identified documentation required by K Basins Operations. Looking at the items in the matrix, it can be seen that the subproject does not bear the sole responsibility for the generation of all these items. Rather, many items are outside of the subproject's scope such that other Spent Nuclear Fuel (SNF) organizations are needed to prepare or perform them (e.g., Training, Procedures, Facility Engineering, Startup, etc.). This supporting document, by virtue of all signatures approving it on the Engineering Data Transmittal, documents an agreement among the various represented disciplines and organizations within the SNF Project as to what is required in terms of documentation to transfer custody to Operations.

  8. R. L. Fu;rknsr, Acting Director

    Office of Legacy Management (LM)

    L( i)~J <"j R. L. Fu;rknsr, Acting Director Division of lzlw ?hteri~s ~SJB88~8c~atiOTlhlu aCOI%tre;etfot th6 Sfi6tOth6 C~SSiOrr Of upto2oo,cmpoundru~~ paryear a6 a,bglprobuctfroar ph08$ht6 op6rations at East Tsqm, Pioridaa ma contr8ct jaawides iOr a fi%Rd @C6 Of $4.00 par pound upa Subjact to 6scalatic63 for chmgu in labor sad citaaical COStS UhiCh hSV6 broU&#Xt th6 CUtTWd @C@ t0 $4.17. m C-t C@r68 June 30, i*l Ud6SS th6Cd$siOn o<srciS66 an OptiOntO 6xtadthu contract for an

  9. Large-scale Nanostructure Simulations from X-ray Scattering Data On Graphics Processor Clusters

    SciTech Connect (OSTI)

    Sarje, Abhinav; Pien, Jack; Li, Xiaoye; Chan, Elaine; Chourou, Slim; Hexemer, Alexander; Scholz, Arthur; Kramer, Edward

    2012-01-15

    X-ray scattering is a valuable tool for measuring the structural properties of materialsused in the design and fabrication of energy-relevant nanodevices (e.g., photovoltaic, energy storage, battery, fuel, and carbon capture andsequestration devices) that are key to the reduction of carbon emissions. Although today's ultra-fast X-ray scattering detectors can provide tremendousinformation on the structural properties of materials, a primary challenge remains in the analyses of the resulting data. We are developing novelhigh-performance computing algorithms, codes, and software tools for the analyses of X-ray scattering data. In this paper we describe two such HPCalgorithm advances. Firstly, we have implemented a flexible and highly efficient Grazing Incidence Small Angle Scattering (GISAXS) simulation code based on theDistorted Wave Born Approximation (DWBA) theory with C++/CUDA/MPI on a cluster of GPUs. Our code can compute the scattered light intensity from any givensample in all directions of space; thus allowing full construction of the GISAXS pattern. Preliminary tests on a single GPU show speedups over 125x compared tothe sequential code, and almost linear speedup when executing across a GPU cluster with 42 nodes, resulting in an additional 40x speedup compared to usingone GPU node. Secondly, for the structural fitting problems in inverse modeling, we have implemented a Reverse Monte Carlo simulation algorithm with C++/CUDAusing one GPU. Since there are large numbers of parameters for fitting in the in X-ray scattering simulation model, the earlier single CPU code required weeks ofruntime. Deploying the AccelerEyes Jacket/Matlab wrapper to use GPU gave around 100x speedup over the pure CPU code. Our further C++/CUDA optimization deliveredan additional 9x speedup.

  10. The effects of zirconia morphology on methanol synthesis from COand H2 over Cu/ZrO2 catalysts: Part I -- Steady-State Studies

    SciTech Connect (OSTI)

    Rhodes, Michael J.; Bell, Alexis T.

    2005-03-21

    The effect of zirconia phase on the activity and selectivityof Cu/ZrO2 for the hydrogenation of CO has been investigated. Relativelypure t-ZrO2 and m-ZrO2 were prepared with high surface areas (~; 145m2/g). Copper was then deposited onto the surface of these materials byeither incipient-wetness impregnation or deposition-precipitation. For afixed Cu surface area, Cu/m-ZrO2 was tenfold more active for methanolsynthesis than Cu/t-ZrO2 from a feed of 3/1 H2/CO at 3.0 MPa andtemperatures between 473 and 523 K. Cu/m-ZrO2 also exhibited a higherselectivity to methanol. Increasing the Cu surface area on m-ZrO2resulted in further improvement in activity with minimal change inselectivity. Methanol productivity increased linearly for both Cu/t-ZrO2and Cu/m-ZrO2 with increasing Cu surface area. The difference in inherentactivity of each phase paralleled the stronger and larger CO adsorptioncapacity of the Cu/m-ZrO2 as quantified by CO-TPD. The higher COadsorption capacity of Cu/m-ZrO2 is attributed to the presence of a highconcentration of anionic vacancies on the surface of m-ZrO2. Suchvacancies expose cus-Zr4+ cations, which act as Lewis acid centers andenhance the Bronsted acidity of adjacent Zr-OH groups. The presence ofcus-Zr4+ sites and adjacent Bronsted acidic Zr-OH groups contributes tothe adsorption of CO as HCOO-Zr groups, which are the initial precursorsto methanol.

  11. Technical Challenges and Scientific Payoffs of Muon BeamAccelerators for Particle Physics

    SciTech Connect (OSTI)

    Zisman, Michael S.

    2007-09-25

    Historically, progress in particle physics has largely beendetermined by development of more capable particle accelerators. Thistrend continues today with the recent advent of high-luminosityelectron-positron colliders at KEK and SLAC operating as "B factories,"the imminent commissioning of the Large Hadron Collider at CERN, and theworldwide development effort toward the International Linear Collider.Looking to the future, one of the most promising approaches is thedevelopment of muon-beam accelerators. Such machines have very highscientific potential, and would substantially advance thestate-of-the-art in accelerator design. A 20-50 GeV muon storage ringcould serve as a copious source of well-characterized electron neutrinosor antineutrinos (a Neutrino Factory), providing beams aimed at detectorslocated 3000-7500 km from the ring. Such long baseline experiments areexpected to be able to observe and characterize the phenomenon ofcharge-conjugation-parity (CP) violation in the lepton sector, and thusprovide an answer to one of the most fundamental questions in science,namely, why the matter-dominated universe in which we reside exists atall. By accelerating muons to even higher energies of several TeV, we canenvision a Muon Collider. In contrast with composite particles likeprotons, muons are point particles. This means that the full collisionenergy is available to create new particles. A Muon Collider has roughlyten times the energy reach of a proton collider at the same collisionenergy, and has a much smaller footprint. Indeed, an energy frontier MuonCollider could fit on the site of an existing laboratory, such asFermilab or BNL. The challenges of muon-beam accelerators are related tothe facts that i) muons are produced as a tertiary beam, with very large6D phase space, and ii) muons are unstable, with a lifetime at rest ofonly 2 microseconds. How these challenges are accommodated in theaccelerator design will be described. Both a Neutrino Factory and a MuonCollider require large numbers of challenging superconducting magnets,including large aperture solenoids, closely spaced solenoids withopposing fields, shielded solenoids, very high field (~;40-50 T)solenoids, and storage ring magnets with a room-temperature midplanesection. Uses for the various magnets will be outlined, along withR&D plans to develop these and other required components of suchmachines.

  12. SU-C-17A-05: Quantification of Intra-Fraction Motion of Breast Tumors Using Cine-MRI

    SciTech Connect (OSTI)

    Heijst, T van; Philippens, M; Bongard, D van den; Asselen, B van; Lagendijk, J; Kleijnen, J; Hartogh, M den

    2014-06-01

    Purpose: Magnetic resonance imaging (MRI) enables direct characterization of intra-fraction motion ofbreast tumors, due to high softtissue contrast and geometric accuracy. The purpose is to analyzethis motion in early-stage breast-cancer patients using pre-operative supine cine-MRI. Methods: MRI was performed in 12 female early-stage breast-cancer patients on a 1.5-T Ingenia (Philips)wide-bore scanner in supine radiotherapy (RT) position, prior to breast-conserving surgery. Twotwodimensional (2D) T2-weighted balanced fast-field echo (cine-MRI) sequences were added tothe RT protocol, oriented through the tumor. They were alternately acquired in the transverse andsagittal planes, every 0.3 s during 1 min. A radiation oncologist delineated gross target volumes(GTVs) on 3D contrast-enhanced MRI. Clinical target volumes (CTV = GTV + 15 mm isotropic)were generated and transferred onto the fifth time-slice of the time-series, to which subsequents lices were registered using a non-rigid Bspline algorithm; delineations were transformed accordingly. To evaluate intra-fraction CTV motion, deformation fields between the transformed delineations were derived to acquire the distance ensuring 95% surface coverage during scanning(P95%), for all in-plane directions: anteriorposterior (AP), left-right (LR), and caudal-cranial(CC). Information on LR was derived from transverse scans, CC from sagittal scans, AP fromboth sets. Results: Time-series with registration errors - induced by motion artifacts - were excluded by visual inspection. For our analysis, 11 transverse, and 8 sagittal time-series were taken into account. Themedian P95% calculated in AP (19 series), CC (8), and LR (11) was 1.8 mm (range: 0.94.8), 1.7mm (0.83.6), and 1.0 mm (0.63.5), respectively. Conclusion: Intra-fraction motion analysis of breast tumors was achieved using cine-MRI. These first results show that in supine RT position, motion amplitudes are limited. This information can be used for adaptive RT planning, and to develop preoperative partial-breast RT strategies, such asablative RT for early-stage breast-cancer patients.