Autonoma de Madrid, Universidad
Prácticas Externas y Empleabilidad (OPE) CRITERIOS DE SELECCIÓN: Manejo de herramientas informáticas básicas (PowerPoint, Excel, Access, etc.). Dominio de Internet y de redes sociales de comunicación
Op-Ed by Secretary of Energy Steven Chu and Secretary of Labor...
Economy April 22, 2009 - 12:00am Addthis To commemorate Earth Day, the op-ed below on green jobs and energy independence by Secretaries Steven Chu and Hilda Solis ran in the...
Op-Ed by Secretary of Energy Steven Chu and Secretary of Labor...
Broader source: Energy.gov (indexed) [DOE]
To commemorate Earth Day, the op-ed below on green jobs and energy independence by Secretaries Steven Chu and Hilda Solis ran in the following papers yesterday and today: Austin...
This guidance on childhood lead screening was devel-oped by CDC in consultation with the members and
preface This guidance on childhood lead screening was devel- oped by CDC in consultation with the members and consultants of the Advisory Committee on Childhood Lead poisoning prevention. The committee-care organizations, academia, and non-governmental agencies working on affordable hous- ing and public lead poisoning
Ph. Boucaud; M. Brinet; F. De Soto; V. Morenas; O. Pène; K. Petrov; J. Rodríguez-Quintero
2014-01-31T23:59:59.000Z
We present a lattice calculation of the renormalized running coupling constant in symmetric (MOM) and asymmetric ($\\widetilde{\\rm MOM}$) momentum substraction schemes including $u$, $d$, $s$ and $c$ quarks in the sea. An Operator Product Expansion dominated by the dimension-two $\\langle A^2\\rangle$ condensate is used to fit the running of the coupling. We argue that the agreement in the predicted $\\langle A^2\\rangle$ condensate for both schemes is a strong support for the validity of the OPE approach and the effect of this non-gauge invariant condensate over the running of the strong coupling.
March 15, 2009 OP-ED COLUMNIST
If you hang around the renewable-energy business for long, you'll hear a lot of tall tales. You'll hear or 20 years hydrogen-powered cars or fusion energy will be a commercial reality. If I had a dime that viable fusion energy or hydrogen-powered cars are "20 years away and always will be." But what
Op-Ed Contributor How Seawater Can Power the World
nuclear fission reactors, turns water into steam, which drives turbines to generate electricity nuclei, in the process converting mass to energy, which appears as heat. The heat, as in conventional, but they control and manipulate such "small suns" with remarkable finesse. Since 1970 the power produced
Autonoma de Madrid, Universidad
documentos - Supervisión de nóminas y contabilidad - Elaboración de memorias y documentos mediante programas
Autonoma de Madrid, Universidad
docentes en la planificación, creación e impartición de MOOCs. Se valorará: · Manejo de herramientas ofimáticas (procesador de texto, hoja de cálculo, etc.). · Manejo plataformas de formación, Internet y bases de datos, herramientas de edición de vídeo y audio y herramientas colaborativas. · Conocimientos
Autonoma de Madrid, Universidad
empresariales · Herramientas para búsqueda de datos de empresas · Manejo de herramientas informáticas: bases de. · Disponibilidad. · Conocimientos básicos de Office (Word, Excel, ...). · Manejo de Internet. CRITERIOS DE. · Conocimientos de inglés. · Conocimientos básicos en ofimática. · Conocimientos página web, manejo de internet
Autonoma de Madrid, Universidad
Movilidad Sostenible. PROYECTO FORMATIVO: A) COMPETENCIAS PROFESIONALES A ADQUIRIR Y DESARROLLAR (escoger de este tipo. Formación continua en temas de movilidad sostenible y su fomento en el campus a los DE SELECCIÓN: Conocimientos de Adobe Dreamweaver. Experiencia en diseño y desarrollo de programas
Autonoma de Madrid, Universidad
Universitario en Planificación y Desarrollo Territorial Sostenible. PROYECTO FORMATIVO: A) COMPETENCIAS
Secretary Chu Op-Ed on Energy Efficiency from the World Economic Forum |
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:DepartmentExecutiveBuilding |Science EducationofUraniumElectric SchoolEnergyLetter
Secretary Chu Op-Ed on Small Modular Reactors in the Wall Street Journal |
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:DepartmentExecutiveBuilding |Science EducationofUraniumElectric SchoolEnergyLetterDepartment of
Secretary Chu's Weatherization Op-Ed in the Huffington Post | Department of
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:DepartmentExecutiveBuilding |ScienceDiscuss the ObamaUniversity
Op-Ed by Secretary of Energy Steven Chu and Secretary of Labor Hilda Solis:
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasma |EfficiencyCR-B-99-02Contact on2009: Chu atEnergyTaxToolEnergy
Improving Public Service Provision in the Devel-oping World Through a Crowd-sourced Location
Köbben, Barend
experiences with Taarifa: a location-based application built through commu- nity development that allows for the community reporting of problems, from health to waste issues, through a mobile phone interface using SMS of Kindness (RHOK) London Water Hackathon. A Hackathon is an organised meeting of developers who team up
Genome Data from DOOR: a Database for prOkaryotic OpeRons
DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]
DOOR provides an Organism View for browsing, a gene search tool, an operon search tool, and the operon prediction interface.[Text taken and edited from http://csbl1.bmb.uga.edu/OperonDB/tutorial.php
OPE for all Helicity Amplitudes II. Form Factors and Data analysis
Basso, Benjamin; Cordova, Lucia; Sever, Amit; Vieira, Pedro
2015-01-01T23:59:59.000Z
We present the general flux tube integrand for MHV and non-MHV amplitudes, in planar N = 4 SYM theory, up to a group theoretical rational factor. We find that the MHV and non-MHV cases only differ by simple form factors which we derive. This information allows us to run the operator product expansion program for all sorts of non-MHV amplitudes and to test the recently proposed map with the so called charged pentagons transitions. Perfect agreement is found, on a large sample of non-MHV amplitudes, with the perturbative data available in the literature.
Autonoma de Madrid, Universidad
online. Se valorará: Conocimientos relativos al uso de herramientas de edición de vídeo y audio (Adobe Premier, Adobe Photoshop, herramientas para capturar pantalla, etc). Manejo de herramientas ofimáticas (procesador de texto, hoja de cálculo, etc.). Manejo plataformas de formación, Internet y recursos digitales
Autonoma de Madrid, Universidad
, tanto en estudios de Grado como en Posgrado. ColaboraciÃ³n en el mantenimiento de las condiciones adecuadas del software y hardware disponible, asÃ como el material perifÃ©rico disponible. Apoyo a las
Tri-City Herald OpEd: Electric Vehicles are a smart choice
Christensen, Peter C.; Haas, Anne M.
2010-12-10T23:59:59.000Z
Why are so many of us at the Pacific Northwest National Laboratory, a national thought leader in power industry issues located right here in the Tri-Cities, so bullish on the future of EVs? And why do we think it's so important that this country, especially THIS part of the country, be leaders in the adoption of EVs? Is it that we all just happen to like driving polluting golf carts? The answer is that, like most everyone else, most of us here at PNNL drive to work every day, and like most people, we care about the cost of gasoline and the impact that burning imported oil has on the environment and on our foreign policy. The reality is that electric vehicles are simply more efficient, pollute much less, use locally-generated energy, and cost MUCH less to drive.
Deputy Secretary Daniel Poneman USA Today Op-Ed September 13, 2011 |
Office of Environmental Management (EM)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,Separation 23 362 of Thomas P.Oil, and Gas SectorsDepartment of Energy More DocumentsDepartment of Energy
Secretary Chu's Op-Ed on Small Modular Reactors in the Wall Street Journal
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasma |Efficiency Â» Search resultsTechnology Â» Search1 Â»Program FundingofRequest || Department of
"Made in the USA" can be Revitalized San Jose Mercury News Op-Ed, 24 October, 2007
O'Brien, James F.
in this vital sector of the US economy. Such a research program would benefit health care, agriculture, and transportation, and strengthen our national resources in defense, energy, and security. The resulting flurry years. Ken Goldberg (UC Berkeley) and Vijay Kumar (UPenn) With input from Ruzena Bajcsy (UC
Autonoma de Madrid, Universidad
remuneradas asignadas a las Facultades y a la Escuela Politécnica, la Comisión Delegada de Empleabilidad equipo de dirección) de cada Centro. CENTRO/SERVICIO Número de prácticas Meses de cada plaza ESCUELA UNIDAD DE CULTURA CIENTIFICA 1 9 CENTRO CULTURAL LA CORRALA MUSEO ARTES Y TRADICIONES POPULARES 3 10 3 8
Hansen, James E.
Communities Act" - in most respects a good piece of legislation - provides incentives for coal gasification to a project extending the life of an 80-year-old coal plant with coal gasification that would not capture fuel, converting the plant's boiler to "plasma gasification" of coal. NRG and state officials have
Harinarayana, T.
," Harinarayana said. "Another benefit of having a roof over the highways is rainwater harvesting at selected
Dec 10, 2001 ... (yair@math.haifa.ac.il). Tommy Elfving. Department of Mathematics, Link oping University,. SE-581 83 Link oping, Sweden. (toelf@mai.liu.se).
rocks have been performed on sandstones, but applying relations devel- oped for sandstones to carbonates
Sankaran, Gregory R.
) but AO [ BO = (-1, 0 [ (0* *, 1). A~[ ~Bis closed and contains A [ B so it contains ______A.[ BWe also
Frosini, Patrizio
'insieme delle matrici reali 4 × 4 con traccia positiva `e un gruppo rispetto alla usuale ope- razione di
A Degrading Way to Make an Organ
Hardin, Jeff
the figure). Both laser ablation (4) and genetic analyses (5, 6) indicate that the shape of the devel oping
ENERGY AND ENVIRONMENT DIVISION ANNUAL REPORT 1978
Cairns, E.L.
2011-01-01T23:59:59.000Z
and thermal standards on energy consumption, and methods forthermal energy. The bioconversion studies are aimed at devel- oping economical methods
Kay, J.
2009-01-01T23:59:59.000Z
alia, February 1981, Battery Storage Side Holbrook, Ope cit.on-site may find Two battery storage economically feasibleuse as low as possible. Battery storage would help regulate
Hazen, Terry
the weekend BP learned that its latest effort at stanching the Deepwater Horizon oil spill -- placing a huge?sq=hazen&st=cse&scp=1&pagewanted=print required on American rigs. But the Deepwater Horizon was hardly without safety or premature signal. When a safety switch is thrown, a device cuts the drill pipe, letting it fall
LiU E-Press Linkoping University Electronic Press 2006-01
Zhao, Yuxiao
LiU E-Press Link¨oping University Electronic Press 2006-01 Erik Sandewall and Peter Berkesand Link¨oping University Electronic Press Activities during 2005 Date of Manuscript: 2006-02-13 Related information can be obtained via the following WWW pages: E-Press Website: The author: http://www.ep.liu.se/ http
Capecchi, Mario R.
-oping, you could: · Use metered parking · Park and pay in the bookstore parking lot. The bookstore visitor parking lot charges $1 per hour. Co-Op Parking Co-oping parents that are bringing a snack or a story have Parent Information Manual #12;2 Contents Phone Numbers 2 School Calendar 2 Tuition & Fees 3 Parking
effective sampling schemes for behavior discrimination in nonlinear
2013-11-08T23:59:59.000Z
Similarly, in optimal control theory, the ... oped for nonlinear ODE models. .... However, in practice, since the low-discrepancy sampling schemes try to cover the whole ...... model predictive control, Automatic Control, IEEE Transactions on,
Temporal Structure of ENSO in 20th Century Climate Simulations
Wittenberg, Andrew
.Wittenberg@noaa.gov Simona Masina, Istituto Nazionale di Geofisica e Vulcanologia, Bologna Italy, Masina in the CGCMs. The ocean analysis devel- oped at the Istituto Nazionale di Geofisica e Vulcanologia (INGV
Aalborg Universitet Modelling of a High Temperature PEM Fuel Cell Stack using Electrochemical
Andreasen, Søren Juhl
and High Temperature Polymer Electrolyte Fuel Cells, La Grande Motte, Montpellier, France. General rights in steady-state as well as in dynamic ope- ration. This work examines the use of electro-chemical impedance
Motomura, Hiroshi
2008-01-01T23:59:59.000Z
Op-Ed. , What Part of ‘Illegal’ Don’t You Understand? , N.Y.protection applies to illegal aliens); Hiroshi Motomura,dealt with the 12 million illegal immigrants already here,
Indoor climate and productivity in office buildings
Schiavon, Stefano; Zecchin, Roberto
2009-01-01T23:59:59.000Z
in improved of the potential heat stress and open-plan re-ope- Medicine, n. 4. heat stress on the Swedish Instituteed. on pairs of stresses: mild heat and low-frequency of
modeling. In particular, it is used in CCM1 and CCM2, the Community Climate Models developed]. In particular, it is used in CCM1, the Community Climate Model devel oped at the National Center
'The Overriding Demand for Energy Conservation in the Cement Industry' An Update
Spellman, L. U.
1981-01-01T23:59:59.000Z
Canal. Recent tests in Sweden, Canada, New York and Michigan show that toxic chlorinated hydro carbons can be completely destroyed during norma1 cement kiln ope rations, eliminating toxic emissions to the environment. On average, the effective fuel...
Bowers, John
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS, VOL. 8, NO. 4, JULY/AUGUST 2002 935 3-D devel- oped today. By making the leap to multilayer interconnects, more compact devices can be obtained
Moduli space actions on the Hochschild co-chains of a Frobenius ...
2008-07-11T23:59:59.000Z
co-cycles of TV. This action is different from ... correlation function is not physical; in other words, OPEs live only inside correlators. In one of our main examples, ...
I. Introduction Simulation Modeling
Tesfatsion, Leigh
-scale system studies such as environmental systems [29]or nuclear fuel waste management programs [7], which indicated that over a half-billion dollars are being spent annually on devel- oping, using, and maintaining
The Analytic Bootstrap and AdS Superhorizon Locality
A. Liam Fitzpatrick; Jared Kaplan; David Poland; David Simmons-Duffin
2013-01-24T23:59:59.000Z
We take an analytic approach to the CFT bootstrap, studying the 4-pt correlators of d > 2 dimensional CFTs in an Eikonal-type limit, where the conformal cross ratios satisfy |u| 2\\Delta_\\phi + 2n for each integer n as l -> infinity. We show how the rate of approach is controlled by the twist and OPE coefficient of the leading twist operator in the \\phi x \\phi OPE, and we discuss SCFTs and the 3d Ising Model as examples. Additionally, we show that the OPE coefficients of other large spin operators appearing in the OPE are bounded as l -> infinity. We interpret these results as a statement about superhorizon locality in AdS for general CFTs.
S. Cecotti; C. Vafa
1992-03-24T23:59:59.000Z
We study some aspects of 2d supersymmetric sigma models on orbifolds. It turns out that independently of whether the 2d QFT is conformal the operator products of twist operators are non-singular, suggesting that massive (non-conformal) orbifolds also `resolve singularities' just as in the conformal case. Moreover we recover the OPE of twist operators for conformal theories by considering the UV limit of the massive orbifold correlation functions. Alternatively, we can use the OPE of twist fields at the conformal point to derive conditions for the existence of non-singular solutions to special non-linear differential equations (such as Painleve III).
Energy-aware simulation with DVFS Tom Guerouta,b,c
Calheiros, Rodrigo N.
Energy-aware simulation with DVFS Tom Gu´erouta,b,c , Thierry Monteila,c , Georges Da Costab are specifically devel- oped for modelling networks and only a few of them simulate energy-efficiency algorithms. This article describes which tools need to be implemented in a simulator in order to compute energy
Amer J of Potato Res (2001) 78:421424 421 Michigan Purple
Douches, David S.
2001-01-01T23:59:59.000Z
Amer J of Potato Res (2001) 78:421424 421 Michigan Purple: A Purple-Skinned Tablestock Variety D. S-ovoid shaped, purple- skinnedtablestock potato variety (Solanum tuberosum L.) devel- oped at Michigan State Purple from field trial at Montcalm Potato Research Farm. Accepted for publicationAugust2, 2001
Liu, Xiaowen "Jason"
and evaluating network routing protocols can be categorized as analytical, simulation-based, and emulation-basedToward Scalable Routing Experiments with Real-Time Network Simulation Yue Li, Jason Liu, and Raju with a previously devel- oped real-time network simulation engine. Our design of the infrastructure uses a novel
Asymptotic distribution of inequalityrestricted canonical correlation with application to tests for
Kuriki, Satoshi
Asymptotic distribution of inequalityÂrestricted canonical correlation with application to tests Running Head: InequalityÂrestricted canonical correlation Address for correspondence: Satoshi KurikiÂway ordered contingency tables based on these models are develÂ oped in a general framework of inequalityÂrestricted
Asymptotic distribution of inequality-restricted canonical correlation with application to tests for
Kuriki, Satoshi
Asymptotic distribution of inequality-restricted canonical correlation with application to tests Running Head: Inequality-restricted canonical correlation Address for correspondence: Satoshi Kuriki-way ordered contingency tables based on these models are devel- oped in a general framework of inequality-restricted
Incremental Testing of ObjectOriented Class Structures
McGregor, John D.
Incremental Testing of ObjectOriented Class Structures Mary Jean Harrold and John D. Mcdesigned, thoroughlytested classes that can be confidently reused for many applications, few class testing techniques have been devel oped. In this paper, we present a class testing technique that exploits
Incremental Testing of Object-Oriented Class Structures
McGregor, John D.
Incremental Testing of Object-Oriented Class Structures Mary Jean Harrold and John D. Mc-designed, thoroughly-tested classes that can be confidently reused for many applications, few class testing techniques have been devel- oped. In this paper, we present a class testing technique that exploits
SOFTWARE Open Access MT-Toolbox: improved amplicon sequencing using
Dangl, Jeff
maximization. It can be run in serial on a standard personal computer or in parallel on a Load Sharing Facility from sequences sharing the same tag enables inference of original template molecules thereby reducing quantification of sequences. To ad- dress these limitations several methods have been devel- oped where randomly
Towards Software Product Lines Application in the Context of a Smart Building Project
Paris-Sud XI, Université de
Towards Software Product Lines Application in the Context of a Smart Building Project Thibaut. This paper presents proposals on how to apply software prod- uct lines in the context of smart buildings the various components involved in smart buildings, and to capitalize on the devel- oped IT components
Axiomatic quantum field theory in curved spacetime
S. Hollands; R. M. Wald
2008-03-13T23:59:59.000Z
The usual formulations of quantum field theory in Minkowski spacetime make crucial use of features--such as Poincare invariance and the existence of a preferred vacuum state--that are very special to Minkowski spacetime. In order to generalize the formulation of quantum field theory to arbitrary globally hyperbolic curved spacetimes, it is essential that the theory be formulated in an entirely local and covariant manner, without assuming the presence of a preferred state. We propose a new framework for quantum field theory, in which the existence of an Operator Product Expansion (OPE) is elevated to a fundamental status, and, in essence, all of the properties of the quantum field theory are determined by its OPE. We provide general axioms for the OPE coefficients of a quantum field theory. These include a local and covariance assumption (implying that the quantum field theory is locally and covariantly constructed from the spacetime metric), a microlocal spectrum condition, an "associativity" condition, and the requirement that the coefficient of the identity in the OPE of the product of a field with its adjoint have positive scaling degree. We prove curved spacetime versions of the spin-statistics theorem and the PCT theorem. Some potentially significant further implications of our new viewpoint on quantum field theory are discussed.
Quantum field theory in curved spacetime, the operator product expansion, and dark energy
S. Hollands; R. M. Wald
2008-05-22T23:59:59.000Z
To make sense of quantum field theory in an arbitrary (globally hyperbolic) curved spacetime, the theory must be formulated in a local and covariant manner in terms of locally measureable field observables. Since a generic curved spacetime does not possess symmetries or a unique notion of a vacuum state, the theory also must be formulated in a manner that does not require symmetries or a preferred notion of a ``vacuum state'' and ``particles''. We propose such a formulation of quantum field theory, wherein the operator product expansion (OPE) of the quantum fields is elevated to a fundamental status, and the quantum field theory is viewed as being defined by its OPE. Since the OPE coefficients may be better behaved than any quantities having to do with states, we suggest that it may be possible to perturbatively construct the OPE coefficients--and, thus, the quantum field theory. By contrast, ground/vacuum states--in spacetimes, such as Minkowski spacetime, where they may be defined--cannot vary analytically with the parameters of the theory. We argue that this implies that composite fields may acquire nonvanishing vacuum state expectation values due to nonperturbative effects. We speculate that this could account for the existence of a nonvanishing vacuum expectation value of the stress-energy tensor of a quantum field occurring at a scale much smaller than the natural scales of the theory.
2006 EAAM Photogrammetric Estimates of Size and Mass in Hawaiian
© 2006 EAAM Photogrammetric Estimates of Size and Mass in Hawaiian Monk Seals (Monachus-invasive photographic technique was devel- oped to estimate the body mass of Hawaiian monk seals (Monachus schauinslandi-kg weaned pups. Key Words: Hawaiian monk seals, Monachus schauinslandi, photogrammetry, morphometric
Higher Spin Currents in Wolf Space: Part III
Ahn, Changhyun
2015-01-01T23:59:59.000Z
The large N=4 linear superconformal algebra (generated by four spin-1/2 currents, seven spin-1 currents, four spin-3/2 currents and one spin-2 current) found by Sevrin, Troost and Van Proeyen (and other groups) was realized in the N=4 superconformal coset SU(5)/SU(3) theory previously. The lowest 16 higher spin currents of spins (1, 3/2, 3/2, 2), (3/2, 2, 2, 5/2), (3/2, 2, 2, 5/2) and (2, 5/2, 5/2, 3) are obtained by starting with the operator product expansions (OPEs) between the four spin-3/2 currents from the above large N=4 linear superconformal algebra and the lowest higher spin-1 current which is the same as the one in the Wolf space coset SU(5)/[SU(3) x SU(2) x U(1)] theory. These OPEs determine the four higher spin-3/2 currents and the next six higher spin-2 currents are obtained from the OPEs between the above four spin-3/2 currents associated with the N=4 supersymmetry and these four higher spin-3/2 currents. The four higher spin-5/2 currents can be determined by calculating the OPEs between the abo...
A Reformed Mathematics Education at Chalmers Stig Larsson
Larsson, Stig
A Reformed Mathematics Education at Chalmers Stig Larsson Department of Mathematics Chalmers@math.chalmers.se Kvalitetskonferensen, Norrk¨oping, September 2527, 2001 Abstract Engineering education faces the challenge to reform to effectively use the new tools offered by computers. We present a program for a reformed engineering
The Potential of Utilizing Chaparral for Energy1 James R. S. Toland2
the United States and other countries to start devel- oping technology for alternative energy systems energy production sites for techniques such as wind generator farms and solar arrays. This would approachThe Potential of Utilizing Chaparral for Energy1 James R. S. Toland2 1 Presented at the Symposium
Protein Folding in Contact Map Space M. Vendruscolo, R. Najmanovich and E. Domany
Domany, Eytan
Protein Folding in Contact Map Space M. Vendruscolo, R. Najmanovich and E. Domany Department the contact map representation for protein folding. We devel oped an efficient search procedure in the space tational physics, chemistry and biology is that of protein folding; e.g. to predict the conformation
How We Achieved a 41% Energy Reduction
Maze, M. E.
of human health ca~e p~oducts and se~ices. At yea~-end 1983, Abbott had 28 facilities in the U.S. and Pue~to Rico totaling mo~e than eight million squa~e feet of floo~ space and also had manufactu~ing and dist~ibution ope~ations and joint ventu...
METHODOLOGY ARTICLE Open Access Gene prioritization and clustering by multi-view
for Biotechnology Informa- tion (NCBI) at the National Library of Medicine (NLM). MEDLINE covers all aspects resource for biomedical text mining applications is the MEDLINE database devel- oped by the National Center of controlled vocabularies and the representation schemes of terms occupy a cen- tral role in text mining
Microbial Energizers: Fuel Cells That Keep on Going
Lovley, Derek
- cessing food wastes. · Optimizing microbial fuel cells will entail devel- oping a better understandingMicrobial Energizers: Fuel Cells That Keep on Going Microbes that produce electricity by oxidizing to eliminate the inefficien- cies of combustion are behind the recent interest in hydrogen fuel cells, which
Stout, Quentin F.
, Canada. T. E. Holzer is with the High Altitude Observatory, National Center for At- mospheric ResearchIEEE TRANSACTIONS ON PLASMA SCIENCE, VOL. 28, NO. 6, DECEMBER 2000 1931 High Performance Computer- oped a high performance, adaptive-scale MHD code capable of resolving many of the critical processes
was to dive underwater and conceal them-selves in mud or vegetation, remaining
Richter, Stephen C.
tails, misplaced bony projections, underdevel- oped digits, Robert DuBois, personal com- munication fumiferana) con- trol, may adversely affect mink frog popu- lations in forest ponds (McAlpine et al., 1998). The susceptibility of mink frog breeding ponds to pH depression resulting from atmospheric acid deposition is con
Recognition efficiency issues for freehand sketches Tevfik Metin Sezgin MTSEZGIN@AI.MIT.EDU
Sezgin, Metin
tree search and subgraph isomorphism perform were not devel- oped with this "recognize as we go recognition methods in the literature perform a search either in the correspondence space, the transformation correspondece space search algorithm Â namely a variant of the interpretation tree (IT) algorithm Â performs
Marschner, Steve
Presented at the IS&T/SID Fifth Color Imaging Conference, November 1997 Inverse Lighting, New York Abstract We introduce a technique for improving photographs using inverse lighting, a new process based on algorithms devel oped in computer graphics for computing the reflection of light in 3D
Renewal Strings for Cleaning Astronomical Databases Amos J. Storkey
Storkey, Amos
Renewal Strings for Cleaning Astronomical Databases Amos J. Storkey School of Informatics 5 Forrest- portion of the records potentially of inter- est to a given astronomer. We have devel- oped renewal- veys are carried out in all wavelength ranges, from high energy gamma rays to the longest wavelength ra
Renewal Strings for Cleaning Astronomical Databases Amos J. Storkey #
Storkey, Amos
Renewal Strings for Cleaning Astronomical Databases Amos J. Storkey # School of Informatics 5 portion of the records potentially of inter est to a given astronomer. We have devel oped renewal veys are carried out in all wavelength ranges, from high energy gamma rays to the longest wavelength ra
NEWS & VIEWS 590 nature physics | VOL 4 | AUGUST 2008 | www.nature.com/naturephysics
Loss, Daniel
de Janeiro, Rio de Janeiro, 21941-972 Brazil. e-mail: bk@if.ufrj.br D oping is a crucial process photon is absorbed, promoting the qubit to its higher-energy state, where the qubit again pushes the circuit current. The qubit energy eventually decays to its lower-energy state emitting a low-energy photon
2 of 11 DOCUMENTS The Washington Post
Deutch, John
On Global Warming John Deutch SECTION: OP-ED; Pg. A27 LENGTH: 1346 words I believe that what we know now about global warming justifies imposition of a modest tax on carbon emissions by the United States away from electricity generated from coal -- will have major economic impacts, at least during
Computational pproach to the Statistical echanics of rotein ol ing
Istrail, Sorin
, 1995 bstract A statistical mechanical approach to the protein folding problem is devel- oped based of the statistical mechanics of protein folding by com- puter simulation. Even though we have taken advantage of new". A theoretical understanding of the protein-folding problem, i.e. how proteins fold to their native states from
JSS Journal of Statistical Software MMMMMM YYYY, Volume VV, Issue II. http://www.jstatsoft.org/
Dahl, David B.
. The jvmr package also provides the reverse functionality for embedding JVM languages in R using, is statistically typed, and is often more concise and expressive than equivalent Java code. R is a scripting language and environment devel- oped by statisticians for statistical computing and graphics with a large
Flat systems, equivalence and trajectory R. M. Murray
Murray, Richard M.
Flat systems, equivalence and trajectory generation Ph. Martin R. M. Murray P. Rouchon Technical report, April 2003 Abstract Flat systems, an important subclass of nonlinear control systems in- troduced the infinite dimensional geometry devel- oped by Vinogradov and coworkers: a control system is a diffiety
Rogers, John A.
light-emitting devices OLEDs are being devel- oped for applications in flat panel displays and lighting into the organic layer s and recombine, giving rise to light emission. The fabrication of OLEDs re- quiresOrganic light-emitting devices with laminated top contacts Daniel A. Bernards, Tomasz Biegala
Transfer Across the Air-Sea Interface Christoph S. Garbe, Anna Rutgersson, Jacqueline Boutin,
Garbe, Christoph S.
): k ¼ F C0 À Cbulk : (2.1) For the transport of CO2, the water-sided transfer velocity kw is often related to the partial pressure difference pCO2 bet, several models have been devel- oped, ranging from conceptual models to numerical models. Most frequently
Finite element study of multi-modal vibration damping for thermal barrier coating applications
barriers for gas turbine blades, there is a growing interest in devel- oping multifunctional coatings methods is critical in many tech- nologies and especially so for gas turbine engines since many the spinning up of the turbine to avoid resonances. One of the advances made in gas turbine technologies, has
Zheng, Yufeng
Mechanical Properties of Controlled Memory and Superelastic Nickel-Titanium Wires Used was to investigate the structure and mechanical properties of newly devel- oped controlled memory (CM) nickel-titanium transformation behavior of both types of wires were examined by x-ray energy dispersive spectroscopy
Software Tools for Technology Transfer manuscript No. (will be inserted by the editor)
David, Alexandre
with powerful SMC analysis techniques for stochastic and hybrid systems. This goal is obtained by devel- oping Model Checking for Biological Systems Alexandre David1 , Kim G. Larsen1 , Axel Legay1,2 , Marius approach for testing and estimating the probability that a stochastic system sat- isfy a given linear
Accomplishments and Remaining Challenges: THREDDS Data Server and
Accomplishments and Remaining Challenges: THREDDS Data Server and Common Data Model Ethan Davis Unidata Policy Committee Meeting 23-24 May 2011 #12;THREDDS Data Server (TDS) · Web server for scientific;THREDDS Data Server (TDS) · ... · Data access services: OPeNDAP OGC WMS and WCS NCSS · Data
The Theory of Island Biogeography
Landweber, Laura
The Theory of Island Biogeography Robert H. MacArthur and Edward O. Wilson The young biologists" dominated by the collection of data. In The Theory of Island Biogeography they set out to change that by devel- oping a general mathema- tical theory that would make sense of a key ecological problem
mPuff: Automated Detection of Cigarette Smoking Puffs from Respiration Measurements
Kumar, Santosh
that accounts for one in five deaths in the United States. Extensive research is conducted on devel- oping deaths in the United States [24]. Smokers die 13-14 years younger and cost $193 billion annually [1 effective smoking cessation programs. Most smoking cessation programs achieve low success rate because
Evaluation of a Pumping Assist Lung That Uses a Rotating Fiber Bundle
Federspiel, William J.
Evaluation of a Pumping Assist Lung That Uses a Rotating Fiber Bundle ROBERT G. SVITEK,* BRIAN J. FRANKOWSKI,* AND WILLIAM J. FEDERSPIEL,*§ A paracorporeal respiratory assist lung (PRAL) is being devel- oped for supplemental gas exchange to allow the native lungs of acute lung failure patients to heal. The device consists
CIRQ: Qualitative fluid flow modelling for aerospace FMEA applications Neal Snooke
Snooke, Neal
M2 CIRQ: Qualitative fluid flow modelling for aerospace FMEA applications Neal Snooke Department- oped on top of the MCIRQ simulator with the aim to produce an automated FMEA for aircraft fuel systems similar to pre- viously developed automated electrical FMEA. Introduction This paper describes a circuit
Tool Support for Incremental Failure Mode and Effects Analysis of Component-Based Systems
¨oping, Sweden {jonel, simin}@ida.liu.se Abstract Failure Mode and Effects Analysis (FMEA) is a well- known technique widely used for safety assessment in the area of safety-critical systems. However, FMEA is tradi systems. Also, small modifications in the design may result in a complete revision of the initial FMEA
Int. J. Ad Hoc and Ubiquitous Computing, Vol. , No. , 2012 1 Worst-case Latency of Broadcast one year as a Research Fellow at Trinity College Dubin. He received his MSc degree in computer science and engi- neering in 2005 and his PhD in computer science in 2011 both from Link¨oping University. His Ph
Encoding Molecular Motions in Voxel Maps Juan Cortes, Sophie Barbe, Monique Erard and Thierry Simeon
Cortés, Juan
1 Encoding Molecular Motions in Voxel Maps Juan Cort´es, Sophie Barbe, Monique Erard and Thierry] have been devel- oped to overcome the limitations of MD. Such methods present however a major drawback, France sbarbe@insa-toulouse.fr M. Erard is with the IPBS, F-31077 Toulouse, France monique
Adaptive Cruise Control: Experimental Validation of Advanced Controllers on Scale-Model Cars
Ames, Aaron
-- Recent advances in automotive technology, such as, sensing and onboard computation, have resulted towards devel- oping advanced controllers for ACC, this paper presents an experimental platform automotive con- trollers like ACC, previous research by the Program of Advanced Technology for the Highway
Heaton, Thomas H.
Francisco, California. For earthquake early warning systems, automated procedures for taking action. A recent example of the need for timely warnings is given by the Asian tsunami disaster which occurred on 26 December 2004. Although early warning systems have long been devel- oped for mitigation of natural
ESSAY #2 H222c Energy & Environment out: 11 April (Weds)
for example today's (11 Apr 2012) Seattle Times Op-Ed on the solar power industry: Tore Torvund, CEO of REC Silicon, manufacturer of polysilicon for solar panels in Moses Lake WA wrote about the situation with the massive solar panel industry in China: a tariff war in the making, with US manufacturers complaining
Wood-Fiber/High-Density-Polyethylene Composites: Coupling Agent Performance
Wood-Fiber/High-Density-Polyethylene Composites: Coupling Agent Performance John Z. Lu,1 Qinglin Wu structure. As a coupling agent, mal- eated polyethylene (MAPE) had a better performance in WPC than oxidized polyethylene (OPE) and pure polyeth- ylene (PPE) because of its stronger interfacial bonding. A combination
Published: 23 June 2011 Another Revolution Afoot in Egypt
Zewail, Ahmed
1 Published: 23 June 2011 Another Revolution Afoot in Egypt: Top-Notch Science Egypt has launched way to cure fanaticism. Op-Ed by Ahmed H. Zewail Cairo -- Nearly 100 days after the revolution, Egypt say hawa gadid -- a new air. The big question is how to channel this energy to forge a new Egypt
Published: 14 October 2013 The Revolution Egypt Needs
Zewail, Ahmed
1 Published: 14 October 2013 The Revolution Egypt Needs Op-Ed by Ahmed H. Zewail Pasadena, California -- When I was a boy in Desuq, Egypt, a city on the Rosetta branch of the Nile, about 50 miles east was in the fabric of our culture and religion. I left Egypt in 1969 for graduate school at the University
Published: 20 May 2012 Egypt's March Toward Democracy
Zewail, Ahmed
1 Published: 20 May 2012 Egypt's March Toward Democracy Op-Ed by Ahmed H. Zewail CAIRO -- A few candidates among the 13 running for president of Egypt. This stunning debate went on for more than four hours and was watched by millions of Egyptians and other Arabs. Contrary to the perception around the world that Egypt
Published: 21 May 2012 Egypt's March Toward Democracy
Zewail, Ahmed
1 Published: 21 May 2012 Egypt's March Toward Democracy Op-Ed by Ahmed H. Zewail CAIRO -- A few candidates among the 13 running for president of Egypt. This stunning debate went on for more than four hours and was watched by millions of Egyptians and other Arabs. Contrary to the perception around the world that Egypt
Published: 6 October 2011 As Elections Loom, Egypt Must Unify
Zewail, Ahmed
1 Published: 6 October 2011 As Elections Loom, Egypt Must Unify Op-Ed by Ahmed H. Zewail "Where is Egypt going?" a driver named Mohamed asked me recently. It is the question on everyone's mind and the building of the new City of Science and Technology. At last, it was felt, Egypt would be rejoining
Published: 3 January 2013 Egypt's New Year
Zewail, Ahmed
1 Published: 3 January 2013 Egypt's New Year Resolution Op-Ed by Ahmed H. Zewail CAIRO -- Egypt, is one of Egypt's largest extremist organizations. "Only when he changes his mind from being a Gamaa Brother to a national leader can we have real progress in Egypt," Mostafa said, adding: "For now
Published: 3 November 2014 Don't Cut Aid to Egypt: The Hopeful Case for
Zewail, Ahmed
1 Published: 3 November 2014 Don't Cut Aid to Egypt: The Hopeful Case for Supporting Egyptian President Sisi Today, the U.S. needs Egypt's partnership more than ever. Op-Ed by Ahmed H. Zewail Some support him. And I believe that cutting foreign aid to Egypt at this point would harm the U.S.-Egypt
A GPU-Like Soft Processor for High-Throughput Acceleration
Steffan, J. Gregory
into a blade server platform, and XtremeData and Nallatech that offer FPGA accelerator modules that can of the implementation, testing, and debugging required for devel- oping real hardware. Behavioral synthesis techniques the advantages of (i) supporting a familiar programming model and environment and (ii) being portable across
California at Riverside, University of
employed to develop comparative sugar yield data for each pretreatment and subsequent enzymatic hydrolysis (CAFI): corn stover pretreatment Richard T. Elander Æ Bruce E. Dale Æ Mark Holtzapple Æ Michael R, has devel- oped comparative data on the conversion of corn stover to sugars by several leading
Chung, Deborah D.L.
by radiofrequency radiation (such as that emitted by a cellular phone), there is a growing need for devel- oping) shielding refers to the blocking of electromagnetic radiation so that the radiation essentially cannot pass conductors such as met- als and carbons mainly shield by reflection of the radiation. On the other hand
BUSINESS ANALYST: A BRIDGE Information Technology
Kundu, Sukhamay
. · Interfaces with IT-development throughout the software develop- ment life-cycle (SDLC) to make sure the right product is devel- oped and all requirements are met. · Manages changes in requirements during SDLC. #12 the requirements BA-process spans the whole SDLC. #12;
p. 7 · Upcoming seminars / events p. 8 The R/V Pacific Storm tows the wave energy buoy devel- oped in a collaboration between OSU, Columbia Power Technologies and the US Navy out to a test site off the coast of Newport. The buoy performed well during its September deployment, with hydrodynamic behavior conforming
reason is cost. High-TC wires in use today are 70% silver by volume. Even if a silver-free
Perrimon, Norbert
in both the superconductor and surrounding metallic casing. By devel- oping lower-temperature but cost-tested powder-in-a-tube technique which was developed for low-temperature superconductors, such as Nb applied superconductivity. Still, we will have to await a few more sequels to this new work24 before we
Mailhes, Corinne
in Table 1. It was devel- oped by ONERA for single-crystalline turbine blades of helicopter turboshaft is investigated. Tensile creep tests were performed under thermal cycling and isothermal conditions at low stress in the most advanced gas turbine engines for aircraft and helicopters. They consist of two phases: a high
Wesfreid, José Eduardo
in a boundary layer on a concave wall, it takes the name of a Taylor-Gortler in- stability. This instability predicted, from experimental re- sults, that, even in this problem, a boundary layer devel- opingPHYSICAL REVIEW A VOLUME 39, NUMBER 2 JANUARY 15, 1989 Oscillatory modes in the flow between two
Carl Lagoze Cornell University
Tomkins, Andrew
- oped special classifications to identify every tablet and its content. (See www. libraries.gr for a great historical perspec- tive on modern libraries.) The need to store and retrieve data has become email search systems to large corporate information- management systems, from small library collections
Lower Bounds on Testing Membership to a Polyhedron by
Grigoriev, Dima
Email:imilar question was ope* *n for algebraic decision dima@cse.psu.edu. Supported in part by the Volkswagen and ECUS030, and by the Volkswagen-Stiftung.oEmail:btaining lower bounds f* *or the complexity of test
rom urban downtown Portland to rural north-
-Ordered 2005 Spill Operations NW/Q&A: Gary Loomis, 6 Founder of Fish First Success Stories StreamNet 9 of past actions to improve those popu- lations and their habitat, and a management #12;2 Middaugh said quality. Through its participation in devel- oping the Willamette subbasin plan, and now with the plan
A, Science Service Geatprs Released on receipt
of Heating and Ventilating Ezgineers. I n preparing the chart the observer makes a s e r i e s of tests at and comfort i s t h e Synthetic.Air Chart , which was devel- oped i n the Ventilation Division of the Chicago Health Department and was adopted i n 1920 as a standard measure of ventilation by the American Society
LoadBalancing Algorithms for Climate Models Ian T. Foster and Brian R. Toonen
LoadBalancing Algorithms for Climate Models Ian T. Foster and Brian R. Toonen Mathematicsbalancing algorithms that we have devel oped for PCCM2, a scalable parallel implementation of the Community Climate Model, and present exper imental results that demonstrate the effectiveness of these algorithms
Institute for Micro System Prof. Dr.-Ing. habil Jrg Mller
Moeller, Ralf
solar cell, potentially high efficient and low cost, is devel- oped, which is based on a rapid melting on crystalline thick film silicon solar cells on glass substrates and polymer fuel cells Micro Total Analysis silicon Recrystallized Thick Film Sili- con Solar Cells on Glass A new type of polycrystalline silicon
Higher Spin Currents in Wolf Space: Part III
Changhyun Ahn
2015-04-01T23:59:59.000Z
The large N=4 linear superconformal algebra (generated by four spin-1/2 currents, seven spin-1 currents, four spin-3/2 currents and one spin-2 current) found by Sevrin, Troost and Van Proeyen (and other groups) was realized in the N=4 superconformal coset SU(5)/SU(3) theory previously. The lowest 16 higher spin currents of spins (1, 3/2, 3/2, 2), (3/2, 2, 2, 5/2), (3/2, 2, 2, 5/2) and (2, 5/2, 5/2, 3) are obtained by starting with the operator product expansions (OPEs) between the four spin-3/2 currents from the above large N=4 linear superconformal algebra and the lowest higher spin-1 current which is the same as the one in the Wolf space coset SU(5)/[SU(3) x SU(2) x U(1)] theory. These OPEs determine the four higher spin-3/2 currents and the next six higher spin-2 currents are obtained from the OPEs between the above four spin-3/2 currents associated with the N=4 supersymmetry and these four higher spin-3/2 currents. The four higher spin-5/2 currents can be determined by calculating the OPEs between the above four spin-3/2 currents and the higher spin-2 currents. Similarly, the higher spin-3 current is obtained from the OPEs between the four spin-3/2 currents and the higher spin-5/2 currents. The explicit relations between the above 16 higher spin currents and the corresponding 16 higher spin currents which were found in the extension of large N=4 nonlinear superconformal algebra previously are given. By examining the OPEs between the 16 currents from the large N=4 linear superconformal algebra and the 16 higher spin currents, the match with the findings of Beccaria, Candu and Gaberdiel is also given. The next 16 higher spin currents of spins (2, 5/2, 5/2, 3), (5/2, 3, 3, 7/2), (5/2, 3, 3, 7/2) and (3, 7/2, 7/2, 4) occur from the OPEs between the above lowest 16 higher spin currents.
The Euro as More than a Currency: How Salient is the European Single Currency to Europeans
Hayes, Laura J.
2010-07-14T23:59:59.000Z
nt? s a ttit ude as ses sment of Eur ope an Uni on, by att itude as ses sment of Eur o c urr enc y. C oding for re sponde nt? s a ttit ude as ses sment of Eur o c urr enc y: 1 = F or; 2 = Aga ins t. Codi ng for re sponde nt...? s a ttit ude as ses sment of Eur ope an Union: 1 = E U Good Thing; 2 = Ambivale nt (Ne ithe r Good Nor B ad) ; 3 = B ad Thing. 2: Pe rsona l Ide nti ty= res po nde nt? s pe rsona l mea ning att ache d to EU, by att itude...
Locally-smeared operator product expansions
Monahan, Christopher; Orginos, Kostantinos
2014-12-01T23:59:59.000Z
We propose a "locally-smeared Operator Product Expansion" (sOPE) to decompose non-local operators in terms of a basis of locally-smeared operators. The sOPE formally connects nonperturbative matrix elements of smeared degrees of freedom, determined numerically using the gradient flow, to non-local operators in the continuum. The nonperturbative matrix elements do not suffer from power-divergent mixing on the lattice, provided the smearing scale is kept fixed in the continuum limit. The presence of this smearing scale prevents a simple connection to the standard operator product expansion and therefore requires the construction of a two-scale formalism. We demonstrate the feasibility of our approach using the example of real scalar field theory.
Miyashita, Yasushi
COE 21 12 7 13 30 3 3 327 "úZz·F `è ·F --vZ|·FEl ucidati ng the mechani sms by whi ch nervous ecul es and cel l s. We are investi gati ng these questi ons usi ng the nematode Caenorhabdi ti s el to mol ecul ar and cl assi cal geneti c analysi s. Usi ng recentl y devel oped methods for i n vi vo opti
Secretaries Chu and Clinton Praise Energy Cooperation Across the Americas
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:DepartmentExecutiveBuilding |Science Education Â»ArticleSolarRenewablesBiofuelsin Joint Op-Ed |
Secretaries Chu and Donovan Sign Agreement to Help Working Families
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:DepartmentExecutiveBuilding |Science Education Â»ArticleSolarRenewablesBiofuelsin Joint Op-Ed
~~"jr..TT-."';\\"fli" ~n~/ 2/3/67
Rathbun, Julie A.
that the solar cell load resistor Rs was changed from 1· 37.fL to l· O.f'Lto minimi ze .the effect of temperature on the output of the solar cell (ke e ping it ope rating above the "knee ' in the constant cur- rent region up, but in the worst region, it is considered large enough to r e quire individual calibration curves for each
Taylor, Dorthy
1988-01-01T23:59:59.000Z
for this job. OCCUPATIONAL Include work experiences that have devel oped skills needed for thejob you're seeking. PERSONAL DATA SHEET * Name _____________ Social Security No. _______ Phone: Day Night Address ____________________________ Zip Code... and Work. New York: Warner Books, 1980, pp. 12-18. Interviewing for a Job," Jobs: Preparation and Placeme,?t. A Resource File, Manpower Program in Extension, ECOP Sub? Committee on Community DeveloPW,ent and Publi,c ~Affairs, Network Report, August, 1981...
Twist Field as Three String Interaction Vertex in Light Cone String Field Theory
Isao Kishimoto; Sanefumi Moriyama; Shunsuke Teraguchi
2007-03-22T23:59:59.000Z
It has been suggested that matrix string theory and light-cone string field theory are closely related. In this paper, we investigate the relation between the twist field, which represents string interactions in matrix string theory, and the three-string interaction vertex in light-cone string field theory carefully. We find that the three-string interaction vertex can reproduce some of the most important OPEs satisfied by the twist field.
Explore the Genetic Frontier: Labeling Foods Derived from Biotechnology
Vestal, Andy; Hawkins, Carole
2002-10-19T23:59:59.000Z
and Human Service?s National Institutes of Health has devel- oped guidelines for the laborato- ry use of bio-engineered organisms. While these guidelines are generally vol- untary, they are mandatory for any research conducted with federal grants... attributes because it resembles another food. In 2001, the FDA reaffirmed its deci- sion not to require labeling of all bio- engineered foods, stating that the scientific evidence on biotechnolo- gy-derived foods or ingredients does not warrant labeling...
A Short Guide to Flavour Physics and CP Violation
Lee, Seung J
2015-01-01T23:59:59.000Z
We present the invited lectures given at the second Asia-Europe-Pacific School of High-Energy Physics (AEPSHEP), which took place in Puri, India in November 2014. The series of lectures aimed at graduate students in particle experiment/theory, covering the very basics of flavor physics and CP violation, some useful theoretical methods such as OPE and effective field theories, and some selected topics of flavour physics in the era of LHC.
A distributed converging overland flow model: 2. Effect of infiltration
Sherman, Bernard; Singh, Vijay P.
1976-01-01T23:59:59.000Z
converging surface is studied. Mathematical solutions are devel- oped to study the effect of infiltration on nonlinear overland flow dynamics. To develop mathematical solutions, infiltration and rainfall are represented by simple time and space invariant... functions. For complex rainfall and infiltration functions, explicit solutions are not feasible. INTRODUCTION Overland flow and infiltration have been extensively studied as separate components of the hydrologic cycle [Woolhiser and Liggett, 1967...
Truitt, Clifford Lee, 1948-
2013-03-13T23:59:59.000Z
at no cost to the District. Typical DOTS requests include technically reviewing proposed project designs, compiling and providing references on a technical topic, devel? oping scopes of work for District contracts, reviewing test data and acting... the author managed and executed a complete, comprehensive engineering pro? ject examining the feasibility of an innovative dredged material dis? posal technique. The Indiana Harbor project provided an opportunity to function as a member of a large inter...
Brush Busters: How to Manage Macartney Rose
Hanselka, C. Wayne
2004-12-22T23:59:59.000Z
this Brush Busters method, you?ll be able to kill more than 7 of 10 plants you treat. Your results may vary with weather and other conditions. This method for Macartney rose control was devel- oped and approved by professionals with the Texas Agricultural... Experiment Station and Texas Cooperative Extension, both agencies of The Texas A&M University System. Brush Busters Leaf Spray Method Works Best: On individual disturbed or undisturbed Macartney rose clumps: ? Undisturbed ? Undisturbed plants that are 5 feet...
A Short Guide to Flavour Physics and CP Violation
Seung J. Lee; Hugo Serôdio
2015-04-28T23:59:59.000Z
We present the invited lectures given at the second Asia-Europe-Pacific School of High-Energy Physics (AEPSHEP), which took place in Puri, India in November 2014. The series of lectures aimed at graduate students in particle experiment/theory, covering the very basics of flavor physics and CP violation, some useful theoretical methods such as OPE and effective field theories, and some selected topics of flavour physics in the era of LHC.
Exact Correlators of BPS Operators from the 3d Superconformal Bootstrap
Shai M. Chester; Jaehoon Lee; Silviu S. Pufu; Ran Yacoby
2014-12-29T23:59:59.000Z
We use the superconformal bootstrap to derive exact relations between OPE coefficients in three-dimensional superconformal field theories with ${\\cal N} \\geq 4$ supersymmetry. These relations follow from a consistent truncation of the crossing symmetry equations that is associated with the cohomology of a certain supercharge. In ${\\cal N} = 4$ SCFTs, the non-trivial cohomology classes are in one-to-one correspondence with certain half-BPS operators, provided that these operators are restricted to lie on a line. The relations we find are powerful enough to allow us to determine an infinite number of OPE coefficients in the interacting SCFT ($U(2)_2 \\times U(1)_{-2}$ ABJ theory) that constitutes the IR limit of $O(3)$ ${\\cal N} = 8$ super-Yang-Mills theory. More generally, in ${\\cal N} = 8$ SCFTs with a unique stress tensor, we are led to conjecture that many superconformal multiplets allowed by group theory must actually be absent from the spectrum, and we test this conjecture in known ${\\cal N} = 8$ SCFTs using the superconformal index. For generic ${\\cal N} = 8$ SCFTs, we also improve on numerical bootstrap bounds on OPE coefficients of short and semi-short multiplets and discuss their relation to the exact relations between OPE coefficients we derived. In particular, we show that the kink previously observed in these bounds arises from the disappearance of a certain quarter-BPS multiplet, and that the location of the kink is likely tied to the existence of the $U(2)_2 \\times U(1)_{-2}$ ABJ theory, which can be argued to not possess this multiplet.
An engineering study of rural motor vehicle accidents in Brazos County, Texas
Schleider, Robert Herman
1957-01-01T23:59:59.000Z
ol QQI p 0 tu - de ghtt Cl 0 lmp oper turn -cut co e on left 001 p p t -fo agloe 0 O R I ood c oss g mist on 0 CI osrego d top g 0 C3 D s ego d stop-o d-go tght 0 0 Om eg d a?g sg 2 0 0 t 0 oper pore g tocat o 0 0 I p ope ta tmg t on pa ked pos...
Catherine Patterson
2005-01-01T23:59:59.000Z
-making they pursued. While the author does not make an explicit argument for this, the book provides evidence for a devel- oping capitalist (or at least market-oriented) outlook among the landed gen- try. Even if the Verneys were fairly hard-nosed businessmen... the lives of the people. Broad argues that the Verneys? dealings with the people of Claydon reflects the tension between the family?s modernizing economic outlook and a strong sense of paternalism, ?modi- fied and modernised to accommodate the Puritan...
Pruning and Training Peach Orchards
Price, R. H.
1901-01-01T23:59:59.000Z
is directing the growth of succeeding branches. The idea of correct train- ing should come befo~e successful pruning. we prune in olrder to train a tree according to some preconceived ideal of form. We also prune, , less frequently, to remove dead wood...- wards. No one should prune a peach tree without fully understanding the necessity of the operation and also what results such an ope~ation of surgery would have upon the future growth of the tree. The best form of top for a given locality...
Cheeseman, R.J.
1987-04-01T23:59:59.000Z
The Warsaw Pact countries obtain U.S. technologies by legal and illegal means. Methods of collection include espionage, overt collection, acquisition by scientific and educational exchange participants, and illegal trade activities. Examples of methods used by the Warsaw Pact countries (except the USSR) are provided. The US faces barriers to preventing loss of its technologies. Among these are resistance from US business interests, insufficient cooperation between US government agencies and overseas allies, lack of US counterintelligence personnel, and the openess of American society. The study concludes that the Warsaw Pact's countries have narrowed NATO's qualitative lead in weaponry as a result of the Warsaw Pact's acquisition effort.
Full accuracy differential GPS C/A code pseudorange error correction concept
Desai, Rajendra Laxman
1983-01-01T23:59:59.000Z
correction concept. Furthermore two types of plots of the eighteen satellite orbit conf'gunation of the Global Positioning System is devel oped . The first plot shows the subpoi nt of the satellste orbit on the face of the earth. Infonmation on land masses... and satellite identif'cation is included on the plot. The second plot shows a three-drmensional nepnesentation of the eanth and the actual satellite orbits anound the earth. The earth may be viewed fnom any desired latitude and longitude. Landmasses...
Pion mass effects on axion emission from neutron stars through NN bremsstrahlung processes
S. Stoica; B. Pastrav; J. E. Horvath; M. P. Allen
2009-11-30T23:59:59.000Z
The rates of axion emission by nucleon-nucleon bremsstrahlung are calculated with the inclusion of the full momentum contribution from a nuclear one pion exchange (OPE) potential. The contributions of the neutron-neutron (nn), proton-proton (pp) and neutron-proton (np) processes in both the nondegenerate and degenerate limits are explicitly given. We find that the finite momentum corrections to the emissivities are quantitatively significant for the non-degenerate regime and temperature-dependent, and should affect the existing axion mass bounds. The trend of these nuclear effects is to diminish the emissivities.
Self-Dual Supergravity from N = 2 Strings
de Boer, J.; Skenderis, K.
1997-09-24T23:59:59.000Z
A new heterotic N = 2 string with manifest target space supersymmetry is constructed by combining a conventional N = 2 string in the right-moving sector and a Green-Schwarz-Berkovits type string in the left-moving sector. The corresponding sigma model is then obtained by turning on background fields for the massless excitations. We compute the beta functions and we partially check the OPE's of the superconformal algebra perturbatively in {alpha}{prime}, all in superspace. The resulting field equations describe N = 1 self-dual supergravity.
JuliBootS: a hands-on guide to the conformal bootstrap
Paulos, Miguel F
2014-01-01T23:59:59.000Z
We introduce {\\tt JuliBootS}, a package for numerical conformal bootstrap computations coded in {\\tt Julia}. The centre-piece of {\\tt JuliBootS} is an implementation of Dantzig's simplex method capable of handling arbitrary precision linear programming problems with continuous search spaces. Current supported features include conformal dimension bounds, OPE bounds, and bootstrap with or without global symmetries. The code is trivially parallelizable on one or multiple machines. We exemplify usage extensively with several real-world applications. In passing we give a pedagogical introduction to the numerical bootstrap methods.
Bootstrapping the Three-Dimensional Supersymmetric Ising Model
Bobev, Nikolay; Mazac, Dalimil; Paulos, Miguel F
2015-01-01T23:59:59.000Z
We implement the conformal bootstrap program for three-dimensional CFTs with $\\mathcal{N}=2$ supersymmetry and find universal constraints on the spectrum of operator dimensions in these theories. By studying the bounds on the dimension of the first scalar appearing in the OPE of a chiral and an anti-chiral primary, we find a kink at the expected location of the critical three-dimensional $\\mathcal{N}=2$ Wess-Zumino model, which can be thought of as a supersymmetric analog of the critical Ising model. Focusing on this kink, we determine, to high accuracy, the low-lying spectrum of operator dimensions of the theory.
JuliBootS: a hands-on guide to the conformal bootstrap
Miguel F. Paulos
2014-12-12T23:59:59.000Z
We introduce {\\tt JuliBootS}, a package for numerical conformal bootstrap computations coded in {\\tt Julia}. The centre-piece of {\\tt JuliBootS} is an implementation of Dantzig's simplex method capable of handling arbitrary precision linear programming problems with continuous search spaces. Current supported features include conformal dimension bounds, OPE bounds, and bootstrap with or without global symmetries. The code is trivially parallelizable on one or multiple machines. We exemplify usage extensively with several real-world applications. In passing we give a pedagogical introduction to the numerical bootstrap methods.
Time-Symmetric Rolling Tachyon Profile
Matheson Longton
2015-05-04T23:59:59.000Z
We investigate the tachyon profile of a time-symmetric rolling tachyon solution to open string field theory. We algebraically construct the solution of [arXiv:0707.4472] at 6th order in the marginal parameter, and numerically evaluate the corresponding tachyon profile as well as the action and several correlation functions containing the equation of motion. We find that the marginal operator's singular self-OPE is properly regularized and all quantities we examine are finite. In contrast to the widely studied time-asymmetric case, the solution depends nontrivially on the strength of the deformation parameter. For example, we find that the number and period of oscillations of the tachyon field changes as the strength of the marginal deformation is increased. We use the recent renormalization scheme of [arXiv:1412.3466], which contains two free parameters. At finite deformation parameter the tachyon profile depends on these parameters, while when the deformation parameter is small, the solution becomes insensitive to them and behaves like previously studied time-asymmetric rolling tachyon solutions. We also show that convergence of perturbation series is not as straightforward as in the time-asymmetric case with regular OPE, and find evidence that it may depend on the renormalization constants.
Bootstrapping $O(N)$ Vector Models in $4
Shai M. Chester; Silviu S. Pufu; Ran Yacoby
2015-01-06T23:59:59.000Z
We use the conformal bootstrap to study conformal field theories with $O(N)$ global symmetry in $d=5$ and $d=5.95$ spacetime dimensions that have a scalar operator $\\phi_i$ transforming as an $O(N)$ vector. The crossing symmetry of the four-point function of this $O(N)$ vector operator, along with unitarity assumptions, determine constraints on the scaling dimensions of conformal primary operators in the $\\phi_i \\times \\phi_j$ OPE. Imposing a lower bound on the second smallest scaling dimension of such an $O(N)$-singlet conformal primary, and varying the scaling dimension of the lowest one, we obtain an allowed region that exhibits a kink located very close to the interacting $O(N)$-symmetric CFT conjectured to exist recently by Fei, Giombi, and Klebanov. Under reasonable assumptions on the dimension of the second lowest $O(N)$ singlet in the $\\phi_i \\times \\phi_j$ OPE, we observe that this kink disappears in $d =5$ for small enough $N$, suggesting that in this case an interacting $O(N)$ CFT may cease to exist for $N$ below a certain critical value.
Chopra, Omesh K. [Argonne National Lab., IL (United States). Environmental Science Division; Diercks, Dwight R. [Argonne National Lab., IL (United States). Nuclear Engineering Division; Ma, David Chia-Chiun [Argonne National Lab., IL (United States). Environmental Science Division; Garud, Yogendra S. [Argonne National Lab., IL (United States). Environmental Science Division
2013-12-17T23:59:59.000Z
At the request of the United States (U.S.) government, the International Atomic Energy Agency (IAEA) assembled a team of 20 senior safety experts to review the regulatory framework for the safety of operating nuclear power plants in the United States. This review focused on the effectiveness of the regulatory functions implemented by the NRC and on its commitment to nuclear safety and continuous improvement. One suggestion resulting from that review was that the U.S. Nuclear Regulatory Commission (NRC) incorporate lessons learned from periodic safety reviews (PSRs) performed in other countries as an input to the NRC’s assessment processes. In the U.S., commercial nuclear power plants (NPPs) are granted an initial 40-year operating license, which may be renewed for additional 20-year periods, subject to complying with regulatory requirements. The NRC has established a framework through its inspection, and operational experience processes to ensure the safe operation of licensed nuclear facilities on an ongoing basis. In contrast, most other countries do not impose a specific time limit on the operating licenses for NPPs, they instead require that the utility operating the plant perform PSRs, typically at approximately 10-year intervals, to assure continued safe operation until the next assessment. The staff contracted with Argonne National Laboratory (Argonne) to perform a pilot review of selected translated PSR assessment reports and related documentation from foreign nuclear regulatory authorities to identify any potential new regulatory insights regarding license renewal-related topics and NPP operating experience (OpE). A total of 14 PSR assessment documents from 9 countries were reviewed. For all of the countries except France, individual reports were provided for each of the plants reviewed. In the case of France, three reports were provided that reviewed the performance assessment of thirty-four 900-MWe reactors of similar design commissioned between 1978 and 1988. All of the reports reviewed were the regulator’s assessment of the PSR findings rather than the original PSR report, and all but one were English translations from the original language. In these reviews, it was found that most of the countries base their regulatory guidance to some extent (and often to a large extent) on U.S. design codes and standards, NRC regulatory guidance, and U.S. industry guidance. In addition, many of the observed operational technical issues and OpE events reported for U.S. reactors are also cited in the PSR reports. The PSR reports also identified a number of potential technical material/component performance issues and OpE events that are not commonly reported for U.S. plants.
Coal-Oil Mixtures - A U. S. State of the Art Review
Kapp, G. S.
1982-01-01T23:59:59.000Z
:t:teJr..6 Patent No. 3,941,552.(3) TW pltOC.U.6.<.J., patented and tic.eYl.6ed ex.c..tU.6ively in the U.S. to Coatiqu.<.d, Inc.. 3. Chemic.a.t Add.<.:t.<.vu - Coal- .<.J., pulveJr..<.zed to appltowately 80-90% pa.6.6ing 200 muh 174 mic.lton) and then m....<.n:ta.<.n .6:tabil.<.:ty. 3. AU.<.ed oa (Mhland oa, Inc..) - South point, Ohio - The .6 eJ)).{.-c.ommeJr.Clli1 .6Hed COM pltepM a...Uon plant wh.<.c.h ha.6 been in opeJr.a:t.<.on .6-<-Ylc.e the 6ail 06 1981, ha.6 pltoduc.ed ovelt 850,000 gallOYl.6 06 COM...
The ${\\mathcal N}=2$ superconformal bootstrap
Christopher Beem; Madalena Lemos; Pedro Liendo; Leonardo Rastelli; Balt C. van Rees
2014-12-23T23:59:59.000Z
In this work we initiate the conformal bootstrap program for ${\\mathcal N}=2$ superconformal field theories in four dimensions. We promote an abstract operator-algebraic viewpoint in order to unify the description of Lagrangian and non-Lagrangian theories, and formulate various conjectures concerning the landscape of theories. We analyze in detail the four-point functions of flavor symmetry current multiplets and of ${\\mathcal N}=2$ chiral operators. For both correlation functions we review the solution of the superconformal Ward identities and describe their superconformal block decompositions. This provides the foundation for an extensive numerical analysis discussed in the second half of the paper. We find a large number of constraints for operator dimensions, OPE coefficients, and central charges that must hold for any ${\\mathcal N}=2$ superconformal field theory.
Boundary and Interface CFTs from the Conformal Bootstrap
Gliozzi, F; Meineri, M; Rago, A
2015-01-01T23:59:59.000Z
We explore some consequences of the crossing symmetry for defect conformal field theories, focusing on codimension one defects like flat boundaries or interfaces. We study surface transitions of the 3d Ising and other O(N) models through numerical solutions to the crossing equations with the method of determinants. In the extraordinary transition, where the low-lying spectrum of the surface operators is known, we use the bootstrap equations to obtain information on the bulk spectrum of the theory. In the ordinary transition the knowledge of the low-lying bulk spectrum allows to calculate the scale dimension of the relevant surface operator, which compares well with known results of two-loop calculations in 3d. Estimates of various OPE coefficients are also obtained. We also analyze in 4-epsilon dimensions the renormalization group interface between the O(N) model and the free theory and check numerically the results in 3d.
Renyi Entropies, the Analytic Bootstrap, and 3D Quantum Gravity at Higher Genus
Headrick, Matthew; Perlmutter, Eric; Zadeh, Ida G
2015-01-01T23:59:59.000Z
We compute the contribution of the vacuum Virasoro representation to the genus-two partition function of an arbitrary CFT with central charge $c>1$. This is the perturbative pure gravity partition function in three dimensions. We employ a sewing construction, in which the partition function is expressed as a sum of sphere four-point functions of Virasoro vacuum descendants. For this purpose, we develop techniques to efficiently compute correlation functions of holomorphic operators, which by crossing symmetry are determined exactly by a finite number of OPE coefficients; this is an analytic implementation of the conformal bootstrap. Expanding the results in $1/c$, corresponding to the semiclassical bulk gravity expansion, we find that---unlike at genus one---the result does not truncate at finite loop order. Our results also allow us to extend earlier work on multiple-interval Renyi entropies and on the partition function in the separating degeneration limit.
The Bootstrap Program for Boundary CFT_d
Pedro Liendo; Leonardo Rastelli; Balt C. van Rees
2014-10-29T23:59:59.000Z
We study the constraints of crossing symmetry and unitarity for conformal field theories in the presence of a boundary, with a focus on the Ising model in various dimensions. We show that an analytic approach to the bootstrap is feasible for free-field theory and at one loop in the epsilon expansion, but more generally one has to resort to numerical methods. Using the recently developed linear programming techniques we find several interesting bounds for operator dimensions and OPE coefficients and comment on their physical relevance. We also show that the "boundary bootstrap" can be easily applied to correlation functions of tensorial operators and study the stress tensor as an example. In the appendices we present conformal block decompositions of a variety of physically interesting correlation functions.
The ${\\mathcal N}=2$ superconformal bootstrap
Beem, Christopher; Liendo, Pedro; Rastelli, Leonardo; van Rees, Balt C
2014-01-01T23:59:59.000Z
In this work we initiate the conformal bootstrap program for ${\\mathcal N}=2$ superconformal field theories in four dimensions. We promote an abstract operator-algebraic viewpoint in order to unify the description of Lagrangian and non-Lagrangian theories, and formulate various conjectures concerning the landscape of theories. We analyze in detail the four-point functions of flavor symmetry current multiplets and of ${\\mathcal N}=2$ chiral operators. For both correlation functions we review the solution of the superconformal Ward identities and describe their superconformal block decompositions. This provides the foundation for an extensive numerical analysis discussed in the second half of the paper. We find a large number of constraints for operator dimensions, OPE coefficients, and central charges that must hold for any ${\\mathcal N}=2$ superconformal field theory.
More constraining conformal bootstrap
Ferdinando Gliozzi
2013-10-18T23:59:59.000Z
Recently an efficient numerical method has been developed to implement the constraints of crossing symmetry and unitarity on the operator dimensions and OPE coefficients of conformal field theories (CFT) in diverse space-time dimensions. It appears that the calculations can be done only for theories lying at the boundary of the allowed parameter space. Here it is pointed out that a similar method can be applied to a larger class of CFT's, whether unitary or not, and no free parameter remains, provided we know the fusion algebra of the low lying primary operators. As an example we calculate using first principles, with no phenomenological input, the lowest scaling dimensions of the local operators associated with the Yang-Lee edge singularity in three and four space dimensions. The edge exponents compare favorably with the latest numerical estimates. A consistency check of this approach on the 3d critical Ising model is also made.
Analytic bootstrap at large spin
Apratim Kaviraj; Kallol Sen; Aninda Sinha
2015-03-24T23:59:59.000Z
We use analytic conformal bootstrap methods to determine the anomalous dimensions and OPE coefficients for large spin operators in general conformal field theories in four dimensions containing a scalar operator of conformal dimension $\\Delta_\\phi$. It is known that such theories will contain an infinite sequence of large spin operators with twists approaching $2\\Delta_\\phi+2n$ for each integer $n$. By considering the case where such operators are separated by a twist gap from other operators at large spin, we analytically determine the $n$, $\\Delta_\\phi$ dependence of the anomalous dimensions. We find that for all $n$, the anomalous dimensions are negative for $\\Delta_\\phi$ satisfying the unitarity bound, thus extending the Nachtmann theorem to non-zero $n$. In the limit when $n$ is large, we find agreement with the AdS/CFT prediction corresponding to the Eikonal limit of a 2-2 scattering with dominant graviton exchange.
Renyi Entropies, the Analytic Bootstrap, and 3D Quantum Gravity at Higher Genus
Matthew Headrick; Alexander Maloney; Eric Perlmutter; Ida G. Zadeh
2015-03-24T23:59:59.000Z
We compute the contribution of the vacuum Virasoro representation to the genus-two partition function of an arbitrary CFT with central charge $c>1$. This is the perturbative pure gravity partition function in three dimensions. We employ a sewing construction, in which the partition function is expressed as a sum of sphere four-point functions of Virasoro vacuum descendants. For this purpose, we develop techniques to efficiently compute correlation functions of holomorphic operators, which by crossing symmetry are determined exactly by a finite number of OPE coefficients; this is an analytic implementation of the conformal bootstrap. Expanding the results in $1/c$, corresponding to the semiclassical bulk gravity expansion, we find that---unlike at genus one---the result does not truncate at finite loop order. Our results also allow us to extend earlier work on multiple-interval Renyi entropies and on the partition function in the separating degeneration limit.
Analytic bootstrap at large spin
Kaviraj, Apratim; Sinha, Aninda
2015-01-01T23:59:59.000Z
We use analytic conformal bootstrap methods to determine the anomalous dimensions and OPE coefficients for large spin operators in general conformal field theories in four dimensions containing a scalar operator of conformal dimension $\\Delta_\\phi$. It is known that such theories will contain an infinite sequence of large spin operators with twists approaching $2\\Delta_\\phi+2n$ for each integer $n$. By considering the case where such operators are separated by a twist gap from other operators at large spin, we analytically determine the $n$, $\\Delta_\\phi$ dependence of the anomalous dimensions. We find that for all $n$, the anomalous dimensions are negative for $\\Delta_\\phi$ satisfying the unitarity bound, thus extending the Nachtmann theorem to non-zero $n$. In the limit when $n$ is large, we find agreement with the AdS/CFT prediction corresponding to the Eikonal limit of a 2-2 scattering with dominant graviton exchange.
Sheer El-Showk; Miguel F. Paulos; David Poland; Slava Rychkov; David Simmons-Duffin; Alessandro Vichi
2014-06-04T23:59:59.000Z
We use the conformal bootstrap to perform a precision study of the operator spectrum of the critical 3d Ising model. We conjecture that the 3d Ising spectrum minimizes the central charge c in the space of unitary solutions to crossing symmetry. Because extremal solutions to crossing symmetry are uniquely determined, we are able to precisely reconstruct the first several Z2-even operator dimensions and their OPE coefficients. We observe that a sharp transition in the operator spectrum occurs at the 3d Ising dimension Delta_sigma=0.518154(15), and find strong numerical evidence that operators decouple from the spectrum as one approaches the 3d Ising point. We compare this behavior to the analogous situation in 2d, where the disappearance of operators can be understood in terms of degenerate Virasoro representations.
Bootstrapping SCFTs with Four Supercharges
Bobev, Nikolay; Mazac, Dalimil; Paulos, Miguel F
2015-01-01T23:59:59.000Z
We study the constraints imposed by superconformal symmetry, crossing symmetry, and unitarity for theories with four supercharges in spacetime dimension $2\\leq d\\leq 4$. We show how superconformal algebras with four Poincar\\'{e} supercharges can be treated in a formalism applicable to any, in principle continuous, value of $d$ and use this to construct the superconformal blocks for any $d\\leq 4$. We then use numerical bootstrap techniques to derive upper bounds on the conformal dimension of the first unprotected operator appearing in the OPE of a chiral and an anti-chiral superconformal primary. We obtain an intriguing structure of three distinct kinks. We argue that one of the kinks smoothly interpolates between the $d=2$, $\\mathcal N=(2,2)$ minimal model with central charge $c=1$ and the theory of a free chiral multiplet in $d=4$, passing through the critical Wess-Zumino model with cubic superpotential in intermediate dimensions.
Boundary and Interface CFTs from the Conformal Bootstrap
F. Gliozzi; P. Liendo; M. Meineri; A. Rago
2015-05-12T23:59:59.000Z
We explore some consequences of the crossing symmetry for defect conformal field theories, focusing on codimension one defects like flat boundaries or interfaces. We study surface transitions of the 3d Ising and other O(N) models through numerical solutions to the crossing equations with the method of determinants. In the extraordinary transition, where the low-lying spectrum of the surface operators is known, we use the bootstrap equations to obtain information on the bulk spectrum of the theory. In the ordinary transition the knowledge of the low-lying bulk spectrum allows to calculate the scale dimension of the relevant surface operator, which compares well with known results of two-loop calculations in 3d. Estimates of various OPE coefficients are also obtained. We also analyze in 4-epsilon dimensions the renormalization group interface between the O(N) model and the free theory and check numerically the results in 3d.
Multiple Contributors
1981-01-01T23:59:59.000Z
you will curtail :iour /fjOVements -to a small.e:tl scale. 'The engineer' repopl;s YOU'Ll z.OP(~~S Play ho:voc wi tii his f33i3mo8(.~opeB." The si;arf'l.ee"t Jocs 'l~n$fJec-teu. rJim., A hOi?e Less case, his prospects gY1im. liO Joo in {-;'tar;FZ... !\\~Croy norld,,-:d (~\\J.t't.1 y. "~)f;rJt in f ['CHi) ;-;-t;r-u.'baflP hfinc'!. Bre;:d;h(~ dp cply.1I Str-l.:cbFl~~(-; ;-'Tin',::. r'.I!Aciical i~:Or.'p~': fl'ca-iD.lnc ~Rnt(.:r'. pic'ions r;onf.'i,rmptj, Yirk d-id HS he '!.fa? in:-;t;~~\\,lct,(~d l...
Rivers, George William
1957-01-01T23:59:59.000Z
LRTE 0RLrFEe ,DSW ,DE OWDETO,SW0E R. TEUOU,SW0E ,R c? ATSLOWOU SPEWSE?? MEU1F,U R6,SOWE7 ?O,D 7O..ETEW, 0TRUUEU TSWAE .TRL S UOWAFE 7RLOWSW, .S0,RT .RT TEUOU,SW0E ?1l 2l 3l 5l O?l 23l 25l 26? ,R UEPETSF .S0,RTU ?O,D U1U0Er,O6OFO,N rST,OSFFN 7RLOWSW.... ,NrEU R6,SOWE7 OW a? SW7 a rTRAEWN R. ,DE f?? ? cl 0TRUU? aOA1TE ? UDR?U TErTEUEW,S,OPE .FRTE,U ? ? I * wO? .TRL UErSTS,E rSWO0FEU R6,SOWE7 .TRL S UOWAFE a? rFSW,? 26. -d"rwl X (HEon 20 X r d?i 0 & ?p O W0 d?H H ( P=< OJ on 0S ?p...
Accelerated Nodal Discontinuous Galerkin Simulations for Reverse Time Migration with Large Clusters
Modave, Axel; Mulder, Wim A; Warburton, Tim
2015-01-01T23:59:59.000Z
Improving both accuracy and computational performance of numerical tools is a major challenge for seismic imaging and generally requires specialized implementations to make full use of modern parallel architectures. We present a computational strategy for reverse-time migration (RTM) with accelerator-aided clusters. A new imaging condition computed from the pressure and velocity fields is introduced. The model solver is based on a high-order discontinuous Galerkin time-domain (DGTD) method for the pressure-velocity system with unstructured meshes and multi-rate local time-stepping. We adopted the MPI+X approach for distributed programming where X is a threaded programming model. In this work we chose OCCA, a unified framework that makes use of major multi-threading languages (e.g. CUDA and OpenCL) and offers the flexibility to run on several hardware architectures. DGTD schemes are suitable for efficient computations with accelerators thanks to localized element-to-element coupling and the dense algebraic ope...
Brandt, James M.; Devine, Karen D. [Sandia National Laboratories, Albuquerque, NM; Gentile, Ann C. [Sandia National Laboratories, Albuquerque, NM; Leung, Vitus J. [Sandia National Laboratories, Albuquerque, NM; Olivier, Stephen Lecler [Sandia National Laboratories, Albuquerque, NM; Pedretti, Kevin [Sandia National Laboratories, Albuquerque, NM; Rajamanickam, Sivasankaran [Sandia National Laboratories, Albuquerque, NM; Bunde, David P. [Sandia National Laboratories, Albuquerque, NM; Deveci, Mehmet; Catalyurek, Umit V.
2014-09-01T23:59:59.000Z
As computer systems grow in both size and complexity, the need for applications and run-time systems to adjust to their dynamic environment also grows. The goal of the RAAMP LDRD was to combine static architecture information and real-time system state with algorithms to conserve power, reduce communication costs, and avoid network contention. We devel- oped new data collection and aggregation tools to extract static hardware information (e.g., node/core hierarchy, network routing) as well as real-time performance data (e.g., CPU uti- lization, power consumption, memory bandwidth saturation, percentage of used bandwidth, number of network stalls). We created application interfaces that allowed this data to be used easily by algorithms. Finally, we demonstrated the benefit of integrating system and application information for two use cases. The first used real-time power consumption and memory bandwidth saturation data to throttle concurrency to save power without increasing application execution time. The second used static or real-time network traffic information to reduce or avoid network congestion by remapping MPI tasks to allocated processors. Results from our work are summarized in this report; more details are available in our publications [2, 6, 14, 16, 22, 29, 38, 44, 51, 54].
High-momentum tails from low-momentum effective theories
S. K. Bogner; D. Roscher
2012-08-08T23:59:59.000Z
In a recent work \\cite{Anderson:2010aq}, Anderson \\emph{et al.} used the renormalization group (RG) evolution of the momentum distribution to show that, under appropriate conditions, operator expectation values exhibit factorization in the two-nucleon system. Factorization is useful because it provides a clean separation of long- and short-distance physics, and suggests a possible interpretation of the universal high-momentum dependence and scaling behavior found in nuclear momentum distributions. In the present work, we use simple decoupling and scale-separation arguments to extend the results of Ref. \\cite{Anderson:2010aq} to arbitrary low-energy $A$-body states. Using methods that are reminiscent of the operator product expansion (OPE) in quantum field theory, we find that the high-momentum tails of momentum distributions and static structure factors factorize into the product of a universal function of momentum that is fixed by two-body physics, and a state-dependent matrix element that is the same for both and is sensitive only to low-momentum structure of the many-body state. As a check, we apply our factorization relations to two well-studied systems, the unitary Fermi gas and the electron gas, and reproduce known expressions for the high-momentum tails of each.
Crystalline free energies of micelles of diblock copolymer solutions
D'Adamo, Giuseppe; 10.1063/1.3509391
2012-01-01T23:59:59.000Z
We report a characterization of the relative stability and structural behavior of various micellar crystals of an athermal model of AB-diblock copolymers in solution. We adopt a previously devel- oped coarse-graining representation of the chains which maps each copolymer on a soft dumbbell. Thanks to this strong reduction of degrees of freedom, we are able to investigate large aggregated systems, and for a specific length ratio of the blocks f = MA/(MA + MB) = 0.6, to locate the order-disorder transition of the system of micelles. Above the transition, mechanical and thermal properties are found to depend on the number of particles per lattice site in the simulation box, and the application of a recent methodology for multiple occupancy crystals (B.M. Mladek et al., Phys. Rev. Lett. 99, 235702 (2007)) is necessary to correctly define the equilibrium state. Within this scheme we have performed free energy calculations at two reduced density {\\rho}/{\\rho}\\ast = 4,5 and for several cubic structures as FCC,BCC,A1...
Stellarator Coil Design and Plasma Sensitivity
Long-Poe Ku and Allen H. Boozer
2010-11-03T23:59:59.000Z
The rich information contained in the plasma response to external magnetic perturbations can be used to help design stellarator coils more effectively. We demonstrate the feasibility by first devel- oping a simple, direct method to study perturbations in stellarators that do not break stellarator symmetry and periodicity. The method applies a small perturbation to the plasma boundary and evaluates the resulting perturbed free-boundary equilibrium to build up a sensitivity matrix for the important physics attributes of the underlying configuration. Using this sensitivity information, design methods for better stellarator coils are then developed. The procedure and a proof-of-principle application are given that (1) determine the spatial distributions of external normal magnetic field at the location of the unperturbed plasma boundary to which the plasma properties are most sen- sitive, (2) determine the distributions of external normal magnetic field that can be produced most efficiently by distant coils, (3) choose the ratios of the magnitudes of the the efficiently produced magnetic distributions so the sensitive plasma properties can be controlled. Using these methods, sets of modular coils are found for the National Compact Stellarator Experiment (NCSX) that are either smoother or can be located much farther from the plasma boundary than those of the present design.
Decay constants of heavy-light vector mesons from QCD sum rules
Patrick Gelhausen; Alexander Khodjamirian; Alexei A. Pivovarov; Denis Rosenthal
2015-03-27T23:59:59.000Z
We revisit QCD sum rules for the decay constants of heavy-light mesons. In the sum rules for the vector mesons B^*_(s) and D^*_(s) we improve the accuracy of OPE, taking into account the O(alpha_s^2) terms in the perturbative part and calculating the O(alpha_s) corrections to the quark-condensate contribution. With this accuracy, we obtain the ratios of decay constants: f_B^*/f_B=1.02 +0.07 -0.03, f_D^*/f_D=1.20 +0.10 -0.07. The sum rule predictions for the decay constants of pseudoscalar mesons are updated with the results f_B=(207 +17 -9) MeV, f_B_s=(242 +17 -12) MeV, f_D=(201 +12 -13) MeV, f_D_s=(238 +13 -23) MeV. In order to assess the sensitivity of our calculation to the form of the sum rule, we consider alternative versions such as the power moments and Borel sum rules with different weights of the spectral density. We also investigated the heavy quark limit of the sum rules for vector and pseudoscalar mesons, estimating the violations of the heavy-quark spin and flavour symmetry.
On linear stability and dispersion for crystals in the Schroedinger-Poisson model
Alexander Komech; Elena Kopylova
2015-08-22T23:59:59.000Z
We consider the Schr\\"odinger-Poisson-Newton equations as a model of crystals. Our basic results are the stability and the dispersion decay for the linearized dynamics at the ground state for crystals with a cubic lattice and one ion per cell. This linearization is a Hamilton system with nonselfadjoint (and even nonsymmetric) generator. We diagonalize this Hamilton generator in the Bloch representation using our theory of spectral resolution of the Hamilton ope\\-rators with positive definite energy \\ci{KK2014a,KK2014b}. Using this spectral resolution, we establish the stability the dispersion decay. Our key result is the energy positivity of the Bloch generators for small elementary charge $e>0$ under a novel Wiener-type condition on the ion charge density. The corresponding examples are given. To prove the positivity we construct the asymptotics of the ground state as $e\\to 0$ and show that the minimal zero eigenvalue, corresponding to $e=0$, bifurcates into positive eigenvalues $\\sim e^2$.
A Natural Language for AdS/CFT Correlators
Fitzpatrick, A.Liam; /Boston U.; Kaplan, Jared; /SLAC; Penedones, Joao; /Perimeter Inst. Theor. Phys.; Raju, Suvrat; /Harish-Chandra Res. Inst.; van Rees, Balt C.; /YITP, Stony Brook
2012-02-14T23:59:59.000Z
We provide dramatic evidence that 'Mellin space' is the natural home for correlation functions in CFTs with weakly coupled bulk duals. In Mellin space, CFT correlators have poles corresponding to an OPE decomposition into 'left' and 'right' sub-correlators, in direct analogy with the factorization channels of scattering amplitudes. In the regime where these correlators can be computed by tree level Witten diagrams in AdS, we derive an explicit formula for the residues of Mellin amplitudes at the corresponding factorization poles, and we use the conformal Casimir to show that these amplitudes obey algebraic finite difference equations. By analyzing the recursive structure of our factorization formula we obtain simple diagrammatic rules for the construction of Mellin amplitudes corresponding to tree-level Witten diagrams in any bulk scalar theory. We prove the diagrammatic rules using our finite difference equations. Finally, we show that our factorization formula and our diagrammatic rules morph into the flat space S-Matrix of the bulk theory, reproducing the usual Feynman rules, when we take the flat space limit of AdS/CFT. Throughout we emphasize a deep analogy with the properties of flat space scattering amplitudes in momentum space, which suggests that the Mellin amplitude may provide a holographic definition of the flat space S-Matrix.
Universality of Long-Distance AdS Physics from the CFT Bootstrap
A. Liam Fitzpatrick; Jared Kaplan; Matthew T. Walters
2014-07-10T23:59:59.000Z
We begin by explicating a recent proof of the cluster decomposition principle in AdS_{d+1} from the CFT_d bootstrap in d > 2. The CFT argument also computes the leading interactions between distant objects in AdS, and we confirm the universal agreement between the CFT bootstrap and AdS gravity in the semi-classical limit. We proceed to study the generalization to 2d CFTs, which requires knowledge of the Virasoro conformal blocks in a lightcone OPE limit. We compute these blocks in a semiclassical, large central charge approximation, and use them to prove a suitably modified theorem. In particular, from the 2d bootstrap we prove the existence of large spin operators with fixed 'anomalous dimensions' indicative of the presence of deficit angles in AdS_3. As we approach the threshold for the BTZ black hole, interpreted as a CFT scaling dimension, the twist spectrum of large spin operators becomes dense. Due to the exchange of the Virasoro identity block, primary states above the BTZ threshold mimic a thermal background for light operators. We derive the BTZ quasi-normal modes, and we use the bootstrap equation to prove that the twist spectrum is dense. Corrections to thermality could be obtained from a more refined computation of the Virasoro conformal blocks.
Carbon-carbon bond cleavage of 1,2-hydroxy ethers b7 vanadium(V) dipicolinate complexes
Hanson, Susan K [Los Alamos National Laboratory; Gordon, John C [Los Alamos National Laboratory; Thorn, David L [Los Alamos National Laboratory; Scott, Brian L [Los Alamos National Laboratory; Baker, R Tom [Los Alamos National Laboratory
2009-01-01T23:59:59.000Z
The development of alternatives to current petroleum-based fuels and chemicals is becoming increasingly important due to concerns over climate change, growing world energy demand, and energy security issues. Using non-food derived biomass to produce renewable feedstocks for chemicals and fuels is a particularly attractive possibility. However, the majority of biomass is in the form of lignocellulose, which is often not fully utilized due to difficulties associated with breaking down both lignin and cellulose. Recently, a number of methods have been reported to transform cellulose directly into more valuable materials such as glucose, sorbitol, 5-(chloromethyl)furfural, and ethylene glycol. Less progress has been made with selective transformations of lignin, which is typically treated in paper and forest industries by kraft pulping (sodium hydroxide/sodium sulfide) or incineration. Our group has begun investigating aerobic oxidative C-C bond cleavage catalyzed by dipicolinate vanadium complexes, with the idea that a selective C-C cleavage reaction of this type could be used to produce valuable chemicals or intermediates from cellulose or lignin. Lignin is a randomized polymer containing methoxylated phenoxy propanol units. A number of different linkages occur naturally; one of the most prevalent is the {beta}-O-4 linkage shown in Figure 1, containing a C-C bond with 1,2-hydroxy ether substituents. While the oxidative C-C bond cleavage of 1,2-diols has been reported for a number of metals, including vanadium, iron, manganese, ruthenium, and polyoxometalate complexes, C-C bond cleavage of 1,2-hydroxy ethers is much less common. We report herein vanadium-mediated cleavage of C-C bonds between alcohol and ether functionalities in several lignin model complexes. In order to explore the scope and potential of vanadium complexes to effect oxidative C-C bond cleavage in 1,2-hydroxy ethers, we examined the reactivity of the lignin model complexes pinacol monomethyl ether (A), 2-phenoxyethanol (B), and 1,2-diphenyl-2-methoxyethanol (C) (Figure 1). Reaction of (dipic)V{sup V}(O)O{sup i}Pr (1a) or (dipic)V{sup v}(O)OEt (lb) with A, B, or C in acetonitrile yielded new vanadium(V) complexes where the alcohol-ether ligand was bound in a chelating fashion. From the reaction of 1b with pinacol monomethyl ether (A) in acetonitrile solution, (dipic)V{sup v}(O)(pinOMe) (2) (PinOMe = 2,3-dimethyl-3-methoxy-2-butanoxide) was isolated in 61 % yield. Reaction of 1b with 2-phenoxyethanol (B) in acetonitrile gave the new complex (dipic)V{sup v}(O)(OPE) (3) (OPE = 2-phenoxyethoxide), which was isolated in 76% yield. In a similar fashion, 1a reacted with 1,2-diphenyl-2-methoxyethanol (C) to give (dipic)V(O)(DPME) (4) (DPME = 1,2-diphenyl-2-methoxyethoxide), which was isolated in 39% yield. Complexes 2, 3, and 4 were characterized by {sup 1}H NMR and IR spectroscopy, elemental analysis, and X-ray crystallography. Compared to the previously reported vanadium(V) pinacolate complex (dipic)V(O)(pinOH) the X-ray structure of complex 2 reveals a slightly shorter V = O bond, 1.573(2) {angstrom} vs 1.588(2) {angstrom} for the pinOH structure. Complexes 3 and 4 display similar vanadium oxo bond distances of 1.568(2) {angstrom} and 1.576(2) {angstrom}, respectively. All three complexes show longer bonds to the ether-oxygen trans to the oxo (2.388(2) {angstrom} for 2, 2.547(2) {angstrom} for 3, and 2.438(2) {angstrom} for 4) than to the hydroxy-oxygen in the pinOH structure (2.252(2) {angstrom}).
Williams, Dean N. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
2011-06-03T23:59:59.000Z
For the Earth System Grid Federation (ESGF), the ESG-CET team has led international development and delivered a production environment for managing and accessing ultrascale climate data. This production environment includes multiple national and international climate projects (e.g., Couple Model Intercomparison Project, Community Earth System Model), ocean model data (such as the Parallel Ocean Program), observation data (Carbon Dioxide Information and Analysis Center, Atmospheric Infrared Sounder, and so forth), and analysis and visualization tools, all of which serve a diverse community of users. These data holdings and services are distributed across multiple ESG-CET sites (such as LANL, LBNL, LLNL, NCAR, and ORNL) as well as at unfunded partners sites such as the Australian National University National Computational Infrastructure, the British Atmospheric Data Centre, the National Oceanic and Atmospheric Administration Geophysical Fluid Dynamics Laboratory, the Max Planck Institute for Meteorology, the German Climate Computing Centre, and the National Aeronautics and Space Administration Jet Propulsion Laboratory. More recently, ESG-CET has been extending services beyond data-file access and delivery to develop more detailed information products (scientific graphics, animations, etc.), secure binary data-access services (based upon the OPeNDAP protocol), and server-side analysis capabilities. These will allow users to request data subsets transformed through commonly used analysis and intercomparison procedures. As we transition from development activities to production and operations, the ESG-CET team is tasked with making data available to all users seeking to understand, process, extract value from, visualize, and/or communicate it to others. This ongoing effort, though daunting in scope and complexity, will greatly magnify the value of numerical climate model outputs and climate observations for future national and international climate-assessment reports. Continued ESGF progress will result in a production ultrascale data system for empowering scientists who attempt new and exciting data exchanges that could ultimately lead to breakthrough climate-science discoveries.
Real-Time Control of Diesel Combustion Quality
Wagner, R.M.; Sisken, K (Detroit Diesel Corp.)
2010-06-30T23:59:59.000Z
Detroit Diesel Corporation (DDC) and ORNL established this CRADA to improve heavy-duty engine efficiency with reduced emissions at relatively extreme operating regimes such has high EGR, low-load, and cold-start, with an emphasis on the application of advanced control strategies. The approach used in this collaborative effort was to include the application of novel analysis and modeling techniques devel-oped from the application of nonlinear dynamics and chaos theory. More specifically, analytical tech-niques derived from these theories were to used to detect, characterize, and control the combustion insta-bilities that are responsible for poor combustion performance and corresponding high emissions. The foundation of this CRADA was established based on ORNL expertise on the fundamentals of ad-vanced combustion operation and experience with nonlinear dynamics and controls in combustion sys-tems. The initial plan was all data generation would be performed at DDC with an agreed upon experi-mental plan formed by both organizations. While numerous experiments were performed at DDC and the data was exchanged with ORNL researchers, the team decided to transfer an engine to ORNL to allow more flexibility and data generation opportunities. A prototype DDC Series 60 with a common rail fuel system was selected and installed at ORNL. DDC and ORNL maintained a strong collaboration throughout much of this project. Direct funding from DOE ended in 2004 and DDC continued to fund at a reduced amount through 2007. This CRADA has not been funded in more recent years but has been maintained active in anticipation of restored funding. This CRADA has led to additional collaborations between DDC and ORNL.
Williams, Dean N. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
2007-09-26T23:59:59.000Z
This report discusses a project that used prototyping technology to access and analyze climate data. This project was initially funded under the DOE’s Next Generation Internet (NGI) program, with follow-on support from BER and the Mathematical, Information, and Computational Sciences (MICS) office. In this prototype, we developed Data Grid technologies for managing the movement and replication of large datasets, and applied these technologies in a practical setting (i.e., an ESG-enabled data browser based on current climate data analysis tools), achieving cross-country transfer rates of more than 500 Mb/s. Having demonstrated the potential for remotely accessing and analyzing climate data located at sites across the U.S., we won the “Hottest Infrastructure” award in the Network Challenge event. While the ESG I prototype project substantiated a proof of concept (“Turning Climate Datasets into Community Resources”), the SciDAC Earth System Grid (ESG) II project made this a reality. Our efforts targeted the development of metadata technologies (standard schema, XML metadata extraction based on netCDF, and a Metadata Catalog Service), security technologies (Web-based user registration and authentication, and community authorization), data transport technologies (GridFTPenabled OPeNDAP-G for high-performance access, robust multiple file transport and integration with mass storage systems, and support for dataset aggregation and subsetting), as well as web portal technologies to provide interactive access to climate data holdings. At this point, the technology was in place and assembled, and ESG II was poised to make a substantial impact on the climate modelling community.
Crystalline free energies of micelles of diblock copolymer solutions
Giuseppe D'Adamo; Carlo Pierleoni
2012-01-06T23:59:59.000Z
We report a characterization of the relative stability and structural behavior of various micellar crystals of an athermal model of AB-diblock copolymers in solution. We adopt a previously devel- oped coarse-graining representation of the chains which maps each copolymer on a soft dumbbell. Thanks to this strong reduction of degrees of freedom, we are able to investigate large aggregated systems, and for a specific length ratio of the blocks f = MA/(MA + MB) = 0.6, to locate the order-disorder transition of the system of micelles. Above the transition, mechanical and thermal properties are found to depend on the number of particles per lattice site in the simulation box, and the application of a recent methodology for multiple occupancy crystals (B.M. Mladek et al., Phys. Rev. Lett. 99, 235702 (2007)) is necessary to correctly define the equilibrium state. Within this scheme we have performed free energy calculations at two reduced density {\\rho}/{\\rho}\\ast = 4,5 and for several cubic structures as FCC,BCC,A15. At both densities, the BCC symmetry is found to correspond to the minimum of the unconstrained free energy, that is to the stable symmetry among the few considered, while the A15 structure is almost degenerate, indicating that the present sys- tem prefers to crystallize in less packed structures. At {\\rho}/{\\rho}\\ast = 4 close to melting, the Lindemann ratio is fairly high (~ 0.29) and the concentration of vacancies is roughly 6%. At {\\rho}/{\\rho}\\ast = 5 the mechanical stability of the stable BCC structure increases and the concentration of vacancies ac- cordingly decreases. The ratio of the corona layer thickness to the core radius is found to be in good agreement with experimental data for poly(styrene-b-isoprene)(22-12) in isoprene selective solvent which is also reported to crystallize in the BCC structure.
BEAM DYNAMICS IN NS-FFAG EMMAWITH DYNAMICAL MAPS
Giboudot, Y; Edgecock, R; Wolski, A
2010-01-01T23:59:59.000Z
The Non Scaling Fixed Field Alternating Gradient EMMA has a compact linear lattice. Effect of Fringe Field on the beam has to be studied carefully. A numerical magnetic field map is generated by magnet measurements or magnet design softwares. We developed a technique that produces from the numerical field map, a dynamical map for a particle travelling in the entire EMMA cell for a reference energy without acceleration. Since the beam dynamics change with energy, a set of maps have been produce with different reference energies between 10 and 20MeV. For each reference energy, simulated tune and time of flight (TOF) have been compared with results in Zgoubi - tracking directly through numerical field map. The range of validity of a single map has been investigated by tracking particle with large energy deviation. From that, a ...
DOE SciDAC's Earth System Grid Center for Enabling Technologies Final Report
Williams, Dean N. [Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
2011-09-27T23:59:59.000Z
The mission of the Earth System Grid Federation (ESGF) is to provide the worldwide climate-research community with access to the data, information, model codes, analysis tools, and intercomparison capabilities required to make sense of enormous climate data sets. Its specific goals are to (1) provide an easy-to-use and secure web-based data access environment for data sets; (2) add value to individual data sets by presenting them in the context of other data sets and tools for comparative analysis; (3) address the specific requirements of participating organizations with respect to bandwidth, access restrictions, and replication; (4) ensure that the data are readily accessible through the analysis and visualization tools used by the climate research community; and (5) transfer infrastructure advances to other domain areas. For the ESGF, the U.S. Department of Energy's (DOE's) Earth System Grid Center for Enabling Technologies (ESG-CET) team has led international development and delivered a production environment for managing and accessing ultra-scale climate data. This production environment includes multiple national and international climate projects (such as the Community Earth System Model and the Coupled Model Intercomparison Project), ocean model data (such as the Parallel Ocean Program), observation data (Atmospheric Radiation Measurement Best Estimate, Carbon Dioxide Information and Analysis Center, Atmospheric Infrared Sounder, etc.), and analysis and visualization tools, all serving a diverse user community. These data holdings and services are distributed across multiple ESG-CET sites (such as ANL, LANL, LBNL/NERSC, LLNL/PCMDI, NCAR, and ORNL) and at unfunded partner sites, such as the Australian National University National Computational Infrastructure, the British Atmospheric Data Centre, the National Oceanic and Atmospheric Administration Geophysical Fluid Dynamics Laboratory, the Max Planck Institute for Meteorology, the German Climate Computing Centre, the National Aeronautics and Space Administration Jet Propulsion Laboratory, and the National Oceanic and Atmospheric Administration. The ESGF software is distinguished from other collaborative knowledge systems in the climate community by its widespread adoption, federation capabilities, and broad developer base. It is the leading source for present climate data holdings, including the most important and largest data sets in the global-climate community, and - assuming its development continues - we expect it to be the leading source for future climate data holdings as well. Recently, ESG-CET extended its services beyond data-file access and delivery to include more detailed information products (scientific graphics, animations, etc.), secure binary data-access services (based upon the OPeNDAP protocol), and server-side analysis. The latter capabilities allow users to request data subsets transformed through commonly used analysis and intercomparison procedures. As we transition from development activities to production and operations, the ESG-CET team is tasked with making data available to all users seeking to understand, process, extract value from, visualize, and/or communicate it to others. This ongoing effort, though daunting in scope and complexity, will greatly magnify the value of numerical climate model outputs and climate observations for future national and international climate-assessment reports. The ESG-CET team also faces substantial technical challenges due to the rapidly increasing scale of climate simulation and observational data, which will grow, for example, from less than 50 terabytes for the last Intergovernmental Panel on Climate Change (IPCC) assessment to multiple Petabytes for the next IPCC assessment. In a world of exponential technological change and rapidly growing sophistication in climate data analysis, an infrastructure such as ESGF must constantly evolve if it is to remain relevant and useful. Regretfully, we submit our final report at the end of project funding. To continue to serve the climate-science community, we are
Daymet: Daily Surface Weather Data on a 1-km Grid for North America, Version 2.
Thornton, Peter E [ORNL; Thornton, Michele M [ORNL; Mayer, Benjamin W [ORNL; Wilhelmi, Nate [National Center for Atmospheric Research (NCAR); Wei, Yaxing [ORNL; Devarakonda, Ranjeet [ORNL; Cook, Robert B [ORNL
2014-01-01T23:59:59.000Z
More information: http://daymet.ornl.gov Presenter: Ranjeet Devarakonda Environmental Sciences Division Oak Ridge National Laboratory (ORNL) Daymet: Daily Surface Weather Data and Climatological Summaries provides gridded estimates of daily weather parameters for North America, including daily continuous surfaces of minimum and maximum temperature, precipitation occurrence and amount, humidity, shortwave radiation, snow water equivalent, and day length. The current data product (Version 2) covers the period January 1, 1980 to December 31, 2013 [1]. The prior product (Version 1) only covered from 1980-2008. Data are available on a daily time step at a 1-km x 1-km spatial resolution in Lambert Conformal Conic projection with a spatial extent that covers the conterminous United States, Mexico, and Southern Canada as meteorological station density allows. Daymet data can be downloaded from 1) the ORNL Distributed Active Archive Center (DAAC) search and order tools (http://daac.ornl.gov/cgi-bin/cart/add2cart.pl?add=1219) or directly from the DAAC FTP site (http://daac.ornl.gov/cgi-bin/dsviewer.pl?ds_id=1219) and 2) the Single Pixel Tool [2] and THREDDS (Thematic Real-time Environmental Data Services) Data Server [3]. The Single Pixel Data Extraction Tool allows users to enter a single geographic point by latitude and longitude in decimal degrees. A routine is executed that translates the (lon, lat) coordinates into projected Daymet (x,y) coordinates. These coordinates are used to access the Daymet database of daily-interpolated surface weather variables. Daily data from the nearest 1 km x 1 km Daymet grid cell are extracted from the database and formatted as a table with one column for each Daymet variable and one row for each day. All daily data for selected years are returned as a single (long) table, formatted for display in the browser window. At the top of this table is a link to the same data in a simple comma-separated text format, suitable for import into a spreadsheet or other data analysis software. The Single Pixel Data Extraction Tool also provides the option to download multiple coordinates programmatically. A multiple extractor script is freely available to download at http://daymet.ornl.gov/files/daymet.zip. The ORNL DAAC s THREDDS data server (TDS) provides customized visualization and access to Daymet time series of North American mosaics. Users can subset and download Daymet data via a variety of community standards, including OPeNDAP, NetCDF Subset service, and Open Geospatial Consortium (OGC) Web Map/Coverage Service. The ORNL DAAC TDS also exposes Daymet metadata through its ncISO service to facilitate harvesting Daymet metadata records into 3rd party catalogs. References: [1] Thornton, P.E., M.M. Thornton, B.W. Mayer, N. Wilhelmi, Y. Wei, R. Devarakonda, and R.B. Cook. 2014. Daymet: Daily Surface Weather Data on a 1-km Grid for North America, Version 2. Data set. Available on-line [http://daac.ornl.gov] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, USA. [2] Devarakonda R., et al. 2012. Daymet: Single Pixel Data Extraction Tool. Available on-line [http://daymet.ornl.go/singlepixel.html]. [3] Wei Y., et al. 2014. Daymet: Thematic Real-time Environmental Data Services. Available on-line [http://daymet.ornl.gov/thredds_tiles.html].
Experimental Measurement of the Flow Field of Heavy Trucks
Fred Browand; Charles Radovich
2005-05-31T23:59:59.000Z
Flat flaps that enclose the trailer base on the sides and top are known to reduce truck drag and reduce fuel consumption. Such flapped-truck geometries have been studied in laboratory wind tunnels and in field tests. A recent review of wind tunnel data for a variety of truck geometries and flow Reynolds numbers show roughly similar values of peak drag reduction, but differ in the determination of the optimum flap angle. Optimum angles lie in the range 12 degrees-20 degrees, and may be sensitive to Reynolds number and truck geometry. The present field test is undertaken to provide additional estimates of the magnitude of the savings to be expected on a typical truck for five flap angles 10, 13, 16, 19, and 22 degrees. The flaps are constructed from a fiberglass-epoxy-matrix material and are one-quarter of the base width in length (about 61 cm, or 2 feet). They are attached along the rear door hinge lines on either side of the trailer, so that no gap appears at the joint between the flap and the side of the trailer The flap angle is adjusted by means of two aluminum supports. The present test is performed on the NASA Crows Landing Flight Facility at the northern end of the San Joaquin valley in California. The main runway is approximately 2400 meters in length, and is aligned approximately in a north-south direction The test procedure is to make a series of runs starting at either end of the runway. All runs are initiated under computer control to accelerate the truck to a target speed of 60 mph (96 6 km/hr), to proceed at the target speed for a fixed distance, and to decelerate at the far end of the runway. During a run, the broadcast fuel rate, the engine rpm, forward speed, elapsed time--as well as several other parameters (10 in all)--are digitized at a rate of 100 digitizations per second. Various flapped-conditions are interspersed with the ''no flaps'' control, and are sequenced in a different order on different days. Approximately 310 runs are accumulated over the 5-day test period, May 17-21, 2004. The runway slopes rather uniformly upward from north-to-south. Over the distance of 2424 meters between our two ''start'' markers at either end of the runway, the net change in elevation is a little over ten meters. Test results clearly show the greater fuel consumption required to lift the truck against gravity in the southbound direction For this reason, it is important that the tests be averaged over a round trip circuit--that is, a run in both directions over the identical portion of the roadway. Northbound-southbound averages require an overlap segment of the runway (near the middle of the runway) where the truck--starting from either end--has achieved its target speed. For the target truck speed of 60 mph, this overlap region is approximately 700 meters in length. Typically a run and the return run are accomplished within a time interval of 6 minutes. Analysis of the data show fuel consumption savings at all flap angle settings tested, when compared to the ''no flaps'' condition. The most beneficial flap angle appears to be 13 degrees, for which the fuel consumption is 0.3778 {+-} 0.0025 liters/km compared to the ''no flaps'' control of 0.3941 {+-} 0.0034 liters/km. The error bounds expressed above mark the 99% confidence interval in the mean values given. That is, additional estimates of the mean fuel consumption would be expected to lie within the bounds given, approximately 99% of the time. The fuel consumption saving is--to reasonable accuracy--about 1.63 liters/100 kilometers. These savings represent the increment associated only with the change in drag due to the presence or absence of flaps. The result will hold for any truck of similar size and shape and engine performance regardless of the loading of the truck or the rolling resistance. The economy achieved by use of base flaps can be compared to the economy resulting from driving two trucks in a tandem configuration. In December 2003, such fuel consumption tests were performed at the same Crows Landing testsite. In the tests, two identical trucks are ope
Continuous Severe Plastic Deformation Processing of Aluminum Alloys
Raghavan Srinivasan (PI); Prabir K. Chaudhury; Balakrishna Cherukuri; Qingyou Han; David Swenson; Percy Gros
2006-06-30T23:59:59.000Z
Metals with grain sizes smaller than 1-micrometer have received much attention in the past decade. These materials have been classified as ultra fine grain (UFG) materials (grain sizes in the range of 100 to 1000-nm) and nano-materials (grain size <100-nm) depending on the grain size. This report addresses the production of bulk UFG metals through the use of severe plastic deformation processing, and their subsequent use as stock material for further thermomechanical processing, such as forging. A number of severe plastic deformation (SPD) methods for producing bulk UFG metals have been developed since the early 1990s. The most promising of these processes for producing large size stock that is suitable for forging is the equal channel angular extrusion or pressing (ECAE/P) process. This process involves introducing large shear strain in the work-piece by pushing it through a die that consists of two channels with the same cross-sectional shape that meet at an angle to each other. Since the cross-sections of the two channels are the same, the extruded product can be re-inserted into the entrance channel and pushed again through the die. Repeated extrusion through the ECAE/P die accumulates sufficient strain to breakdown the microstructure and produce ultra fine grain size. It is well known that metals with very fine grain sizes (< 10-micrometer) have higher strain rate sensitivity and greater elongation to failure at elevated temperature, exhibiting superplastic behavior. However, this superplastic behavior is usually manifest at high temperature (> half the melting temperature on the absolute scale) and very low strain rates (< 0.0001/s). UFG metals have been shown to exhibit superplastic characteristics at lower temperature and higher strain rates, making this phenomenon more practical for manufacturing. This enables part unitization and forging more complex and net shape parts. Laboratory studies have shown that this is particularly true for UFG metals produced by SPD techniques. This combination of properties makes UFG metals produced by SPD very attractive as machining, forging or extrusion stock, both from the point of view of formability as well as energy and cost saving. However, prior to this work there had been no attempt to transfer these potential benefits observed in the laboratory scale to industrial shop floor. The primary reason for this was that the laboratory scale studies had been conducted to develop a scientific understanding of the processes that result in grain refinement during SPD. Samples that had been prepared in the laboratory scale were typically only about 10-mm diameter and 50-mm long (about 0.5-inch diameter and 2-inches long). The thrust of this project was three-fold: (i) to show that the ECAE/P process can be scaled up to produce long samples, i.e., a continuous severe plastic deformation (CSPD) process, (ii) show the process can be scaled up to produce large cross section samples that could be used as forging stock, and (iii) use the large cross-section samples to produce industrial size forgings and demonstrate the potential energy and cost savings that can be realized if SPD processed stock is adopted by the forging industry. Aluminum alloy AA-6061 was chosen to demonstrate the feasibility of the approach used. The CSPD process developed using the principles of chamber-less extrusion and drawing, and was demonstrated using rolling and wire drawing equipment that was available at Oak Ridge National Laboratory. In a parallel effort, ECAE/P dies were developed for producing 100-mm square cross section SPD billets for subsequent forging. This work was carried out at Intercontinental Manufacturing Co. (IMCO), Garland TX. Forging studies conducted with the ECAE/P billets showed that many of the potential benefits of using UFG material can be realized. In particular, the material yield can be increased, and the amount of material that is lost as scrap can be reduced by as much as 50%. Forging temperatures can also be reduced by over 150ºC, resulting in energy savings in the ope