National Library of Energy BETA

Sample records for indonesia-gtz mini-hydropower schemes

  1. Indonesia-GTZ Mini-Hydropower Schemes for Sustainable Economic Development

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QAsource History View NewTexas: Energy ResourcesOrder at 8, 13 (Vt. WaterInformation National| Open Energy

  2. Indonesia-GTZ Emissions Reductions in Urban Transport | Open Energy

    Open Energy Info (EERE)

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on QA:QAsource History View NewTexas: Energy ResourcesOrder at 8, 13 (Vt. WaterInformation National

  3. The Gambit Scheme manual.

    E-Print Network [OSTI]

    2008-01-22

    REPL is then entered after displaying a message which describes the next step of ..... (add-hook 'inferior-scheme-mode-hook (function gambit-inferior-mode)). (

  4. Compact Spreader Schemes

    SciTech Connect (OSTI)

    Placidi, M.; Jung, J. -Y.; Ratti, A.; Sun, C.

    2014-07-25

    This paper describes beam distribution schemes adopting a novel implementation based on low amplitude vertical deflections combined with horizontal ones generated by Lambertson-type septum magnets. This scheme offers substantial compactness in the longitudinal layouts of the beam lines and increased flexibility for beam delivery of multiple beam lines on a shot-to-shot basis. Fast kickers (FK) or transverse electric field RF Deflectors (RFD) provide the low amplitude deflections. Initially proposed at the Stanford Linear Accelerator Center (SLAC) as tools for beam diagnostics and more recently adopted for multiline beam pattern schemes, RFDs offer repetition capabilities and a likely better amplitude reproducibility when compared to FKs, which, in turn, offer more modest financial involvements both in construction and operation. Both solutions represent an ideal approach for the design of compact beam distribution systems resulting in space and cost savings while preserving flexibility and beam quality.

  5. Jet Schemes and Truncated Wedge Schemes Cornelia O. Yuen

    E-Print Network [OSTI]

    Smith, Karen E.

    Jet Schemes and Truncated Wedge Schemes by Cornelia O. Yuen A dissertation submitted in partial of jets and arcs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 1.2 A higher dimension analog of arcs and jets . . . . . . . . . . . . . . . . . . . 3 1.3 History

  6. Beyond Scheme F

    SciTech Connect (OSTI)

    Elliott, C.J.; Fisher, H.; Pepin, J.; Gillmann, R.

    1996-07-01

    Traffic classification techniques were evaluated using data from a 1993 investigation of the traffic flow patterns on I-20 in Georgia. First we improved the data by sifting through the data base, checking against the original video for questionable events and removing and/or repairing questionable events. We used this data base to critique the performance quantitatively of a classification method known as Scheme F. As a context for improving the approach, we show in this paper that scheme F can be represented as a McCullogh-Pitts neural network, oar as an equivalent decomposition of the plane. We found that Scheme F, among other things, severely misrepresents the number of vehicles in Class 3 by labeling them as Class 2. After discussing the basic classification problem in terms of what is measured, and what is the desired prediction goal, we set forth desirable characteristics of the classification scheme and describe a recurrent neural network system that partitions the high dimensional space up into bins for each axle separation. the collection of bin numbers, one for each of the axle separations, specifies a region in the axle space called a hyper-bin. All the vehicles counted that have the same set of in numbers are in the same hyper-bin. The probability of the occurrence of a particular class in that hyper- bin is the relative frequency with which that class occurs in that set of bin numbers. This type of algorithm produces classification results that are much more balanced and uniform with respect to Classes 2 and 3 and Class 10. In particular, the cancellation of errors of classification that occurs is for many applications the ideal classification scenario. The neural network results are presented in the form of a primary classification network and a reclassification network, the performance matrices for which are presented.

  7. New LNG process scheme

    SciTech Connect (OSTI)

    Foglietta, J.H.

    1999-07-01

    A new LNG cycle has been developed for base load liquefaction facilities. This new design offers a different technical and economical solution comparing in efficiency with the classical technologies. The new LNG scheme could offer attractive business opportunities to oil and gas companies that are trying to find paths to monetize gas sources more effectively; particularly for remote or offshore locations where smaller scale LNG facilities might be applicable. This design offers also an alternative route to classic LNG projects, as well as alternative fuel sources. Conceived to offer simplicity and access to industry standard equipment, This design is a hybrid result of combining a standard refrigeration system and turboexpander technology.

  8. A DAW lockout scheme

    SciTech Connect (OSTI)

    Landeche, D.A. [Entergy Operations, Inc., Killona, LA (United States)

    1996-10-01

    In it`s document TR-105834, Project 24414 dated November 1995 and titled {open_quotes}Zero Plastics and the Radiologically Protected Area Low Level Waste Lockout Program{close_quotes}, EPRI describes DAW lockout as a {open_quotes}very advanced{close_quotes} and {open_quotes}perhaps the most powerful of all approaches to LLW minimization.{close_quotes} The report discusses implementation of a lockout program at Kewaunee, LaSalle and Zion stations but states that {open_quotes}no quantifiable results{close_quotes} were available at time of report printing. Waterford 3 Nuclear Station began implementing a limited lockout scheme in 1993. This paper presents Waterford`s experience and results achieved through the lockout approach.

  9. CECC'08 L. Csirmaz: Secret Sharing Schemes 1 / 35 Secret Sharing Schemes

    E-Print Network [OSTI]

    Csirmaz, László

    CECC'08 L. Csirmaz: Secret Sharing Schemes 1 / 35 Secret Sharing Schemes: Solved & Unsolved Schemes 2 / 35 Secret Sharing Scheme { the beginning Contents 1 Secret Sharing Scheme { the beginning 2 De Schemes 3 / 35 Secret Sharing Scheme { the beginning The beginning What Who When Secret Sharing Shamir [23

  10. Operational Signature Schemes Michael Backes

    E-Print Network [OSTI]

    Operational Signature Schemes Michael Backes CISPA, Saarland University ¨Ozg¨ur Dagdelen TU] transferred the idea of functional encryption to signatures. They basically say that, with knowledge

  11. Alternative subtraction scheme using Nagy Soper dipoles

    E-Print Network [OSTI]

    T. Robens; C. H. Chung

    2010-01-15

    We present an alternative subtraction scheme for the treatment of infrared divergences in NLO QCD calculations. In this scheme, the number of transformations is greatly reduced with respect to the standard subtraction scheme by Catani and Seymour. We discuss the general setup of the scheme as well as first applications to NLO processes at hadron and lepton colliders.

  12. Inoculating Multivariate Schemes Against Differential Attacks

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Inoculating Multivariate Schemes Against Differential Attacks Jintai Ding and Jason E. Gower scheme the Perturbed Matsumoto-Imai-Plus (PMI+) cryptosystem. Keywords: multivariate, public key resources. Multivariate public key cryptography provides one alternative since computations in small finite

  13. Regular differentials and equidimensional scheme-maps.

    E-Print Network [OSTI]

    1910-30-30

    Now fix a base scheme S, and restrict attention to those S-schemes Z whose ... g is smooth at f(x); and since all the relevant data are compatible with flat base.

  14. Optimization of the MOVA Undeniable Signature Scheme

    E-Print Network [OSTI]

    Optimization of the MOVA Undeniable Signature Scheme Jean Monnerat1 , Yvonne Anne Oswald2. This article presents optimization results on the recent MOVA undeniable signature scheme presented by Monnerat of the MOVA scheme depending on the group homomor- phism. Our optimizations focus on the quartic residue

  15. Hybrid Signcryption Schemes With Outsider Security

    E-Print Network [OSTI]

    Dent, Alexander W.

    Hybrid Signcryption Schemes With Outsider Security (Extended Abstract) Alexander W. Dent.dent@rhul.ac.uk Abstract. This paper expands the notion of a KEM­DEM hybrid en- cryption scheme to the signcryption setting by introducing the notion of a signcryption KEM, a signcryption DEM and a hybrid signcryption scheme. We present

  16. A fast stratospheric ozone chemistry schemeA fast stratospheric ozone chemistry scheme Michel Bourqui1

    E-Print Network [OSTI]

    Bourqui, Michel

    A fast stratospheric ozone chemistry schemeA fast stratospheric ozone chemistry scheme Michel a computationally efficient chemical scheme, the FAst STratospheric Ozone Chemistry (FASTOC) scheme, which has advantages over many existing fast methods, as it does not rely on relaxation to assumed conditions, does

  17. DISTINGUISHING SCHEMES AND TASKS IN CHILDREN'S ...

    E-Print Network [OSTI]

    Pedro Gomez

    2013-03-27

    links among schemes—conceptual structures and operations children ..... blueprint supports curriculum design can be found in the software that we have.

  18. High-Order Energy Stable WENO Schemes

    E-Print Network [OSTI]

    A third-order Energy Stable Weighted Essentially Non--Oscillatory (ESWENO) finite difference scheme developed by the authors of the paper [N. K. Yamaleev ...

  19. Finite volume renormalization scheme for fermionic operators

    SciTech Connect (OSTI)

    Monahan, Christopher; Orginos, Kostas [JLAB

    2013-11-01

    We propose a new finite volume renormalization scheme. Our scheme is based on the Gradient Flow applied to both fermion and gauge fields and, much like the Schr\\"odinger functional method, allows for a nonperturbative determination of the scale dependence of operators using a step-scaling approach. We give some preliminary results for the pseudo-scalar density in the quenched approximation.

  20. Year in Industry Scheme The Year in Industry Scheme allows you to spend

    E-Print Network [OSTI]

    Haase, Markus

    Year in Industry Scheme The Year in Industry Scheme allows you to spend your third year in full whether or not to transfer to this scheme during your second year. To be allowed to make the transfer, you must do sufficiently well in your year 1 and 2 examinations; a typical grade average of at least 55

  1. Topology optimization of building bracing schemes

    E-Print Network [OSTI]

    Goo, Zhen John

    2013-01-01

    The thesis presents a technique for producing economical solutions for conventional structural steel frames using topology optimization on the lateral bracing scheme. The study focuses mainly on minimizing the amount of ...

  2. AN ASYMPTOTIC-PRESERVING SCHEME FOR THE ...

    E-Print Network [OSTI]

    2015-07-06

    We present a new asymptotic-preserving scheme for the semicon- ductor Boltzmann ... we propose an alternative based on a splitting approach. It has the ... depending on the device structure. ?(k) is the energy-band diagram given by (

  3. Adaptive Resource Management Schemes for Web Services 

    E-Print Network [OSTI]

    Lee, Heung Ki

    2011-02-22

    MANAGEMENT SCHEMES FOR WEB SERVICES A Dissertation by HEUNG KI LEE Submitted to the O?ce of Graduate Studies of Texas A&M University in partial fulflllment of the requirements for the degree of DOCTOR OF PHILOSOPHY December 2009 Major Subject: Computer...: Chair of Committee, Eun Jung Kim Committee Members, Riccardo Bettati Rabi N. Mahapatra Deepa Kundur Ki Hwan Yum Head of Department, Valerie E. Taylor December 2009 Major Subject: Computer Science iii ABSTRACT Adaptive Resource Management Schemes for Web...

  4. Efficient energy stable numerical schemes for a phase field moving ...

    E-Print Network [OSTI]

    Jie Shen

    2015-01-21

    Jan 7, 2015 ... In this paper, we present two efficient energy stable schemes to solve a ... we obtain a linear coupled energy stable scheme for systems with ...

  5. Year in Industry Scheme The Year in Industry Scheme allows you to spend

    E-Print Network [OSTI]

    Haase, Markus

    -time paid employment, returning to the University for a final fourth year. You are awarded a BSc (IndustryYear in Industry Scheme The Year in Industry Scheme allows you to spend your third year in full second year. To be allowed to make the transfer, you must do sufficiently well in your year 1 and 2

  6. Evaluation of the Hydro-Thermodynamic Soil Vegetation Scheme and implementation of a new numerical scheme

    E-Print Network [OSTI]

    Moelders, Nicole

    ii Evaluation of the Hydro-Thermodynamic Soil Vegetation Scheme and implementation of a new.S. Fairbanks, Alaska August 2005 #12;iii Abstract The Hydro-Thermodynamic Soil-Vegetation Scheme (HTSVS........................................................................................................................... 24 Evaluation of snow depth and soil temperatures predicted by the Hydro- Thermodynamic Soil

  7. Cooling scheme for turbine hot parts

    DOE Patents [OSTI]

    Hultgren, Kent Goran (Winter Park, FL); Owen, Brian Charles (Orlando, FL); Dowman, Steven Wayne (Orlando, FL); Nordlund, Raymond Scott (Orlando, FL); Smith, Ricky Lee (Oviedo, FL)

    2000-01-01

    A closed-loop cooling scheme for cooling stationary combustion turbine components, such as vanes, ring segments and transitions, is provided. The cooling scheme comprises: (1) an annular coolant inlet chamber, situated between the cylinder and blade ring of a turbine, for housing coolant before being distributed to the turbine components; (2) an annular coolant exhaust chamber, situated between the cylinder and the blade ring and proximate the annular coolant inlet chamber, for collecting coolant exhaust from the turbine components; (3) a coolant inlet conduit for supplying the coolant to said coolant inlet chamber; (4) a coolant exhaust conduit for directing coolant from said coolant exhaust chamber; and (5) a piping arrangement for distributing the coolant to and directing coolant exhaust from the turbine components. In preferred embodiments of the invention, the cooling scheme further comprises static seals for sealing the blade ring to the cylinder and flexible joints for attaching the blade ring to the turbine components.

  8. Cross-ontological analytics for alignment of different classification schemes

    DOE Patents [OSTI]

    Posse, Christian (Seattle, WA); Sanfilippo, Antonio P (Richland, WA); Gopalan, Banu (Cleveland, OH); Riensche, Roderick M (Richland, WA); Baddeley, Robert L (Richland, WA)

    2010-09-28

    Quantification of the similarity between nodes in multiple electronic classification schemes is provided by automatically identifying relationships and similarities between nodes within and across the electronic classification schemes. Quantifying the similarity between a first node in a first electronic classification scheme and a second node in a second electronic classification scheme involves finding a third node in the first electronic classification scheme, wherein a first product value of an inter-scheme similarity value between the second and third nodes and an intra-scheme similarity value between the first and third nodes is a maximum. A fourth node in the second electronic classification scheme can be found, wherein a second product value of an inter-scheme similarity value between the first and fourth nodes and an intra-scheme similarity value between the second and fourth nodes is a maximum. The maximum between the first and second product values represents a measure of similarity between the first and second nodes.

  9. Abstract--A mesochronous pipeline scheme is described in this paper. In a conventional pipeline scheme each pipeline stage

    E-Print Network [OSTI]

    Delgado-Frias, José G.

    Abstract-- A mesochronous pipeline scheme is described in this paper. In a conventional pipeline scheme each pipeline stage operates on only one data set at a time. In the mesochronous scheme, pipeline stages operate on multiple data sets simultaneously. The clock period in conventional pipeline scheme

  10. Cryptographic Schemes based on Elliptic Curve Pairings

    E-Print Network [OSTI]

    Paterson, Kenny

    on Elliptic Curve Pairings: Contributions to Public Key Cryptography and Key Agreement Protocols This thesis are then used to make concrete CL-PKC schemes and are also used to make other efficient key agreement protocols. It does rely on the use of a trusted authority (TA) who is in possession of a master key. In this respect

  11. Analysis of modulation scheme using GNU Radio

    E-Print Network [OSTI]

    Yu, Chansu

    1 Analysis of modulation scheme using GNU Radio By: Zeyu long Outline Introduce Project Goal QPSK CPFSK Resolute Project conclusion Project challenges Reference #12;2 Introduce (1) GNU radio: One of the most popular applications of Software Defined Radios Use C++ to write blocks Use python to connect

  12. AN ALGEBRAIC DESCRIPTION OF ITERATIVE DECODING SCHEMES

    E-Print Network [OSTI]

    Soljanin, Emina

    AN ALGEBRAIC DESCRIPTION OF ITERATIVE DECODING SCHEMES ELKE OFFER AND EMINA SOLJANIN Abstract University of Technology, D- 80290 Munich, Germany, elke@lnt.e-technik.tu-muenchen.de Mathematical Sciences Research Center, Bell Labs, Lucent Technologies, Murray Hill, NJ 07974, USA. emina@lucent.com 1 #12;2 E

  13. BRAZIL VISITING FELLOWSHIP SCHEME Application Form

    E-Print Network [OSTI]

    Birmingham, University of

    BRAZIL VISITING FELLOWSHIP SCHEME Application Form APPLICATIONS SHOULD BE TYPEWRITTEN AND BOXES of attendance Qualifications awarded and class of Honours, etc. Principal Subject(s) taken #12;BRAZIL VISITING): Date(s) From To To Nature of work and Position held Name and address of employer #12;BRAZIL VISITING

  14. Embedded Correlated Wavefunction Schemes: Theory and Applications

    E-Print Network [OSTI]

    Florian, Libisch

    of fuel cell catalysis (i.e., O2 reduction at metal surfaces) and plasmon-mediated photocatalysis by metalEmbedded Correlated Wavefunction Schemes: Theory and Applications Florian Libisch, Chen Huang, and Emily A. Carter*,§ Institute for Theoretical Physics, Vienna University of Technology, 1040 Vienna

  15. The Scheme of Beam Synchronization in MEIC

    SciTech Connect (OSTI)

    Zhang, Yuhong; Derbenev, Yaroslav S.; Hutton, Andrew M.

    2013-06-01

    Synchronizing colliding beams at single or multiple collision points is a critical R&D issue in the design of a medium energy electron-ion collider (MEIC) at Jefferson Lab. The path-length variation due to changes in the ion energy, which varies over 20 to 100 GeV, could be more than several times the bunch spacing. The scheme adopted in the present MEIC baseline is centered on varying the number of bunches (i.e., harmonic number) stored in the collider ring. This could provide a set of discrete energies for proton or ions such that the beam synchronization condition is satisfied. To cover the ion energy between these synchronized values, we further propose to vary simultaneously the electron ring circumference and the frequency of the RF systems in both collider rings. We also present in this paper the requirement of frequency tunability of SRF cavities to support the scheme.

  16. Exact scheme independence at two loops

    E-Print Network [OSTI]

    Stefano Arnone; Antonio Gatti; Tim R. Morris; Oliver J. Rosten

    2003-11-11

    We further develop an algorithmic and diagrammatic computational framework for very general exact renormalization groups, where the embedded regularisation scheme, parametrised by a general cutoff function and infinitely many higher point vertices, is left unspecified. Calculations proceed iteratively,by integrating by parts with respect to the effective cutoff, thus introducing effective propagators, and differentials of vertices that can be expanded using the flow equations; many cancellations occur on using the fact that the effective propagator is the inverse of the classical Wilsonian two-point vertex. We demonstrate the power of these methods by computing the beta function up to two loops in massless four dimensional scalar field theory, obtaining the expected universal coefficients, independent of the details of the regularisation scheme.

  17. second-order convex splitting schemes for gradient flows with ...

    E-Print Network [OSTI]

    2011-11-08

    unconditional stability, second order scheme, convex-concave decomposition, epitaxial growth, Ehrlich-. Schwoebel type energy. AMS subject classifications.

  18. Optimal Multiple Assignments with (,)-Scheme for General Access Structures

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Optimal Multiple Assignments with (,)-Scheme for General Access Structures Qiang Li, Xiangxue Li to construct an optimal multiple assignment with threshold schemes for general access structure. In this paper the values of either 0 or 1. We also show that given a complete access structure, an optimal scheme may

  19. Compiler Construction Using Scheme Erik Hilsdale J. Michael Ashley

    E-Print Network [OSTI]

    Dybvig, R. Kent

    Compiler Construction Using Scheme Erik Hilsdale J. Michael Ashley R. Kent Dybvig Daniel P {ehilsdal,jashley,dyb,dfried}@cs.indiana.edu Abstract This paper describes a course in compiler design that focuses on the Scheme implementation of a Scheme compiler that generates native assembly code for a real

  20. Data Distribution Schemes of Sparse Arrays on Distributed Memory Multicomputers

    E-Print Network [OSTI]

    Chung, Yeh-Ching

    (CFS) and Encoding-Decoding (ED), for sparse array distribution. In the CFS scheme, the data are performed before and after the data distribution phase, respectively. To evaluate the CFS and the ED schemes. In theoretical analysis, we analyze the SFC, the CFS, and the ED schemes in terms of the data distribution time

  1. A Subject-Delegated Decryption Scheme with "Tightly" Limited Authority

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    A Subject-Delegated Decryption Scheme with "Tightly" Limited Authority Lihua Wang1 , Takeshi@cs.tsukuba.ac.jp Abstract. In this paper, we present a new proxy cryptosystem named subject-delegated decryption scheme subjects. The advantage of our scheme is that the proxy authorities are tightly limited ("Tightly" Limited

  2. Jet schemes of rational double point singularities Hussein MOURTADA

    E-Print Network [OSTI]

    Jet schemes of rational double point singularities Hussein MOURTADA September 30, 2012 Abstract We prove that for m N, m big enough, the number of irreducble components of the schemes of m-jets centered of the jet schemes of an E6 singularity to its "minimal" embedded resolutions of singularities. 1

  3. Jet schemes of rational double point singularities Hussein Mourtada

    E-Print Network [OSTI]

    Bodin, Arnaud

    Jet schemes of rational double point singularities Hussein Mourtada Abstract. We prove that for m N, m big enough, the number of irreducible compo- nents of the schemes of m-jets centered at a point on the minimal reso- lution of the singularity. We also relate some irreducible components of the jet schemes

  4. Performance Analysis of Bicycle Hire schemes Chris Guenther, Jeremy Bradley

    E-Print Network [OSTI]

    Imperial College, London

    Performance Analysis of Bicycle Hire schemes Chris Guenther, Jeremy Bradley Department of Computing, Imperial College London Bike hire schemes Over past few years, city bicycle hire schemes have emerged occu- pancy, i.e. Bicycle availability at starting stations Parking space availability at destinations

  5. Exact scheme independence at one loop

    E-Print Network [OSTI]

    Stefano Arnone; Antonio Gatti; Tim R. Morris

    2002-06-10

    The requirement that the quantum partition function be invariant under a renormalization group transformation results in a wide class of exact renormalization group equations, differing in the form of the kernel. Physical quantities should not be sensitive to the particular choice of the kernel. We demonstrate this scheme independence in four dimensional scalar field theory by showing that, even with a general kernel, the one-loop beta function may be expressed only in terms of the effective action vertices, and thus, under very general conditions, the universal result is recovered.

  6. Exact scheme independence at one loop

    E-Print Network [OSTI]

    Arnone, S; Morris, T R; Arnone, Stefano; Gatti, Antonio; Morris, Tim R.

    2002-01-01

    The requirement that the quantum partition function be invariant under a renormalization group transformation results in a wide class of exact renormalization group equations, differing in the form of the kernel. Physical quantities should not be sensitive to the particular choice of the kernel. We demonstrate this scheme independence in four dimensional scalar field theory by showing that, even with a general kernel, the one-loop beta function may be expressed only in terms of the effective action vertices, and thus, under very general conditions, the universal result is recovered.

  7. Coupling Schemes in Terahertz Planar Metamaterials

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

    Roy Chowdhury, Dibakar; Singh, Ranjan; Taylor, Antoinette J.; Chen, Hou-Tong; Zhang, Weili; Azad, Abul K.

    2012-01-01

    We present a review of the different coupling schemes in a planar array of terahertz metamaterials. The gap-to-gap near-field capacitive coupling between split-ring resonators in a unit cell leads to either blue shift or red shift of the fundamental inductive-capacitive (LC) resonance, depending on the position of the split gap. The inductive coupling is enhanced by decreasing the inter resonator distance resulting in strong blue shifts of theLCresonance. We observe theLCresonance tuning only when the split-ring resonators are in close proximity of each other; otherwise, they appear to be uncoupled. Conversely, the higher-order resonances are sensitive to the smallest changemore »in the inter particle distance or split-ring resonator orientation and undergo tremendous resonance line reshaping giving rise to a sharp subradiant resonance mode which produces hot spots useful for sensing applications. Most of the coupling schemes in a metamaterial are based on a near-field effect, though there also exists a mechanism to couple the resonators through the excitation of lowest-order lattice mode which facilitates the long-range radiative or diffractive coupling in the split-ring resonator plane leading to resonance line narrowing of the fundamental as well as the higher order resonance modes.« less

  8. Finite-difference schemes for anisotropic diffusion

    SciTech Connect (OSTI)

    Es, Bram van; Koren, Barry; Blank, Hugo J. de

    2014-09-01

    In fusion plasmas diffusion tensors are extremely anisotropic due to the high temperature and large magnetic field strength. This causes diffusion, heat conduction, and viscous momentum loss, to effectively be aligned with the magnetic field lines. This alignment leads to different values for the respective diffusive coefficients in the magnetic field direction and in the perpendicular direction, to the extent that heat diffusion coefficients can be up to 10{sup 12} times larger in the parallel direction than in the perpendicular direction. This anisotropy puts stringent requirements on the numerical methods used to approximate the MHD-equations since any misalignment of the grid may cause the perpendicular diffusion to be polluted by the numerical error in approximating the parallel diffusion. Currently the common approach is to apply magnetic field-aligned coordinates, an approach that automatically takes care of the directionality of the diffusive coefficients. This approach runs into problems at x-points and at points where there is magnetic re-connection, since this causes local non-alignment. It is therefore useful to consider numerical schemes that are tolerant to the misalignment of the grid with the magnetic field lines, both to improve existing methods and to help open the possibility of applying regular non-aligned grids. To investigate this, in this paper several discretization schemes are developed and applied to the anisotropic heat diffusion equation on a non-aligned grid.

  9. High Order Upwind Schemes for Multidimensional Magnetohydrodynamics

    E-Print Network [OSTI]

    P. Londrillo; L. Del Zanna

    1999-10-05

    A general method for constructing high order upwind schemes for multidimensional magnetohydrodynamics (MHD), having as a main built-in condition the divergence-free constraint $\\divb=0$ for the magnetic field vector $\\bb$, is proposed. The suggested procedure is based on {\\em consistency} arguments, by taking into account the specific operator structure of MHD equations with respect to the reference Euler equations of gas-dynamics. This approach leads in a natural way to a staggered representation of the $\\bb$ field numerical data where the divergence-free condition in the cell-averaged form, corresponding to second order accurate numerical derivatives, is exactly fulfilled. To extend this property to higher order schemes, we then give general prescriptions to satisfy a $(r+1)^{th}$ order accurate $\\divb=0$ relation for any numerical $\\bb$ field having a $r^{th}$ order interpolation accuracy. Consistency arguments lead also to a proper formulation of the upwind procedures needed to integrate the induction equations, assuring the exact conservation in time of the divergence-free condition and the related continuity properties for the $\\bb$ vector components. As an application, a third order code to simulate multidimensional MHD flows of astrophysical interest is developed using ENO-based reconstruction algorithms. Several test problems to illustrate and validate the proposed approach are finally presented.

  10. Can Quantum Entanglement Detection Schemes Improve Search?

    E-Print Network [OSTI]

    Luís Tarrataca; Andreas Wichert

    2015-02-06

    Quantum computation, in particular Grover's algorithm, has aroused a great deal of interest since it allows for a quadratic speedup to be obtained in search procedures. Classical search procedures for an $N$ element database require at most $O(N)$ time complexity. Grover's algorithm is able to find a solution with high probability in $O(\\sqrt{N})$ time through an amplitude amplification scheme. In this work we draw elements from both classical and quantum computation to develop an alternative search proposal based on quantum entanglement detection schemes. In 2002, Horodecki and Ekert proposed an efficient method for direct detection of quantum entanglement. Our proposition to quantum search combines quantum entanglement detection alongside entanglement inducing operators. Grover's quantum search relies on measuring a quantum superposition after having applied a unitary evolution. We deviate from the standard method by focusing on fine-tuning a unitary operator in order to infer the solution with certainty. Our proposal sacrifices space for speed and depends on the mathematical properties of linear positive maps $\\Lambda$ which have not been operationally characterized. Whether such a $\\Lambda$ can be easily determined remains an open question.

  11. Evaluation of a vibration source detection scheme

    SciTech Connect (OSTI)

    Jendrzejczyk, J.A.; Wambsganss, M.W.; Smith, R.K.

    1992-04-01

    When the Advanced Photon Source (APS) facility is commissioned, there will be many potential sources of local ground motion excitation (near-field sources). Some of these may be of sufficient amplitude and at a specific frequency so as to be detrimental to the stability of the storage ring beamline. A sampling of possible sources is as follows: 2500-hp chillers in the utility building; six cooling-tower fans that are powered by 75-hp electric motors; various water circulation pumps; power supplies, controllers, and transformers; and air-handling units and associated fans. To detect equipment that causes excessive ground excitation at a site as large as the APS, it will be necessary to have a validated source detection scheme. When performing low-amplitude vibration testing in and around Building 335 of Argonne National Laboratory (ANL), we observed a cyclic 8-Hz vibration. The cyclic nature of the signal is apparent in Fig. 1, which represents data measured on the floor at the main level of Building 335 on March 31, 1992. A simple vibration source location scheme, based on triangulation, was evaluated as a means to locate the source of the 8-Hz vibration and is the subject of this technical note. 1 ref.

  12. Recycling scheme for twin BWRs reactors

    SciTech Connect (OSTI)

    Ramirez-Sanchez, J. R.; Perry, R. T.; Gustavo Alonso, V.; Javier Palacios, H. [Instituto Nacional de Investigaciones Nucleares, La Marquesa s/n, Ocoyoacac 52750 (Mexico)

    2006-07-01

    To asses the advantages of reprocess and recycle the spent fuel from nuclear power reactors, against a once through policy, a MOX fuel design is proposed to match a generic scenario for twin BWRs and establish a fuel management scheme. Calculations for the amount of fuel that the plants will use during 40 years of operation were done, and an evaluation of costs using constant money method for each option applying current prices for uranium and services were made. Finally a comparison between the options was made, resulting that even the current high prices of uranium, still the recycling option is more expensive that the once through alternative. But reprocessing could be an alternative to reduce the amount of spent fuel stored in the reactor pools. (authors)

  13. Refined knot invariants and Hilbert schemes

    E-Print Network [OSTI]

    Eugene Gorsky; Andrei Negu?

    2015-02-13

    We consider the construction of refined Chern-Simons torus knot invariants by M. Aganagic and S. Shakirov from the DAHA viewpoint of I. Cherednik. We give a proof of Cherednik's conjecture on the stabilization of superpolynomials, and then use the results of O. Schiffmann and E. Vasserot to relate knot invariants to the Hilbert scheme of points on the plane. Then we use the methods of the second author to compute these invariants explicitly in the uncolored case. We also propose a conjecture relating these constructions to the rational Cherednik algebra, as in the work of the first author, A. Oblomkov, J. Rasmussen and V. Shende. Among the combinatorial consequences of this work is a statement of the m/n shuffle conjecture.

  14. Invariant discretization schemes for the shallow-water equations

    E-Print Network [OSTI]

    Alexander Bihlo; Roman O. Popovych

    2013-01-03

    Invariant discretization schemes are derived for the one- and two-dimensional shallow-water equations with periodic boundary conditions. While originally designed for constructing invariant finite difference schemes, we extend the usage of difference invariants to allow constructing of invariant finite volume methods as well. It is found that the classical invariant schemes converge to the Lagrangian formulation of the shallow-water equations. These schemes require to redistribute the grid points according to the physical fluid velocity, i.e., the mesh cannot remain fixed in the course of the numerical integration. Invariant Eulerian discretization schemes are proposed for the shallow-water equations in computational coordinates. Instead of using the fluid velocity as the grid velocity, an invariant moving mesh generator is invoked in order to determine the location of the grid points at the subsequent time level. The numerical conservation of energy, mass and momentum is evaluated for both the invariant and non-invariant schemes.

  15. A consistent second order projection scheme for simulating transient...

    Office of Scientific and Technical Information (OSTI)

    A consistent second order projection scheme for simulating transient viscous flow with Smoothed Particle Hydrodynamics. Citation Details In-Document Search Title: A consistent...

  16. Utility Energy Efficiency Schemes: Savings Obligations and Trading...

    Open Energy Info (EERE)

    Utility Energy Efficiency Schemes: Savings Obligations and Trading **Subscription Required** Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Utility Energy Efficiency...

  17. DECOUPLED ENERGY STABLE SCHEMES FOR PHASE-FIELD ...

    E-Print Network [OSTI]

    2014-02-27

    design easy-to-implement, energy stable numerical schemes. For the ...... Basaran, Formation of beads-on-a-string structures during break-up of viscoelastic fila-.

  18. Gambit-C, a portable implementation of Scheme

    E-Print Network [OSTI]

    The remaining fields describe the subproblem associated with the frame, that is the expression ..... (add-hook 'inferior-scheme-mode-hook (function gambit-

  19. Energy stable schemes and numerical simulations of two phase ...

    E-Print Network [OSTI]

    Title: Energy stable schemes and numerical simulations of two phase complex fluids by the phase-field method Abstact: We present an energetic variational ...

  20. Efficient energy stable schemes with spectral discretization in space ...

    E-Print Network [OSTI]

    2012-04-03

    We construct energy stable schemes for the time discretization of the highly ... Fundamentally, the gradient energy density loses its convexity (see a proof in the

  1. Sandia Energy - CRF Experiment Confirms Accepted Oxidation Scheme...

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

    Experiment Confirms Accepted Oxidation Scheme of Proposed Diesel Alternative: Dimethyl Ether Home Energy Transportation Energy CRF Facilities Capabilities News News & Events...

  2. Regularization scheme independence and unitarity in QCD cross sections

    SciTech Connect (OSTI)

    Catani, S.; Seymour, M.H.; Trocsanyi, Z.

    1997-06-01

    When calculating next-to-leading order QCD cross sections, divergences in intermediate steps of the calculation must be regularized. The final result is independent of the regularization scheme used, provided that it is unitary. In this paper we explore the relationship between regularization scheme independence and unitarity. We show how the regularization scheme dependence can be isolated in simple universal components, and how unitarity can be guaranteed for any regularization prescription that can consistently be introduced in one-loop amplitudes. Finally, we show how to derive transition rules between different schemes without having to do any loop calculations. {copyright} {ital 1997} {ital The American Physical Society}

  3. A Curved Boundary Treatment for Discontinuous Galerkin Schemes ...

    E-Print Network [OSTI]

    2015-10-22

    Oct 22, 2015 ... By local truncation error analysis, such a modified DG scheme is ...... ternational Conference on Noise and Vibration Engineering (ISMA2008),.

  4. Hybrid Optimization Schemes for Quantum Control

    E-Print Network [OSTI]

    Michael H. Goerz; K. Birgitta Whaley; Christiane P. Koch

    2015-10-03

    Optimal control theory is a powerful tool for solving control problems in quantum mechanics, ranging from the control of chemical reactions to the implementation of gates in a quantum computer. Gradient-based optimization methods are able to find high fidelity controls, but require considerable numerical effort and often yield highly complex solutions. We propose here to employ a two-stage optimization scheme to significantly speed up convergence and achieve simpler controls. The control is initially parametrized using only a few free parameters, such that optimization in this pruned search space can be performed with a simplex method. The result, considered now simply as an arbitrary function on a time grid, is the starting point for further optimization with a gradient-based method that can quickly converge to high fidelities. We illustrate the success of this hybrid technique by optimizing a holonomic phasegate for two superconducting transmon qubits coupled with a shared transmission line resonator, showing that a combination of Nelder-Mead simplex and Krotov's method yields considerably better results than either one of the two methods alone.

  5. Coordinated Renewable Energy Support Schemes Stine Grenaa Jensen1

    E-Print Network [OSTI]

    Coordinated Renewable Energy Support Schemes Stine Grenaa Jensen1 , and Poul Erik Morthorst2 Risø for renewable energy are regionalised. Two theoretical examples are used to explain interactive effects on, e-ordination of support schemes for renewable energy technologies plays a prominent role at the European agenda (EC, 2005

  6. Secure Channel Coding Schemes based on Polar B. Mafakheri

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    encryption encoding schemes based on polar codes, namely efficient and secure joint secret/public key characteristics of the proposed schemes make them suitable for high-speed communications, such as deep space, error performance, energy efficiency and implementation costs. A solution to the shortcomings rised from

  7. Contemporary Mathematics Explicit schemes in seismic migration and isotropic

    E-Print Network [OSTI]

    Papadakis, Manos

    Multiresolution Analyses (IMRA) for L2(Rd). We develop a wave equation based poststack depth migration schemeContemporary Mathematics Explicit schemes in seismic migration and isotropic multiscale, offers the possibility of reducing the cost of computation. 1. Introduction Migration is a seismic

  8. A GENUINELY MULTIDIMENSIONAL UPWIND SCHEME AND EFFICIENT MULTIGRID SOLVER

    E-Print Network [OSTI]

    the necessity of costly wind­tunnel experiments can be largely reduced. The search for genuinely­resolution discrete equations, thus allowing us to construct a very efficient and simple multigrid steady­state solver. This is the only high­resolution scheme known to us that has this property. The two­dimensional scheme is presented

  9. Compiler Control Power Saving Scheme for Multi Core Processors

    E-Print Network [OSTI]

    Kasahara, Hironori

    Compiler Control Power Saving Scheme for Multi Core Processors Jun shirako , Naoto Oshiyama. To this end, the compiler for a multi core processor is expected not only to parallelize program effectively an application program. This paper proposes a compilation scheme for reduction of power consumption under

  10. Toward the ultimate conservative scheme : following Mathmatiques Appliques de Bordeaux

    E-Print Network [OSTI]

    Abgrall, Rémi

    . They are a blending between a #28;rst order scheme and a second order scheme, the blending is realized from entropy; is the density, u and v are the components of the velocity, #15; the internal energy and E = #26;#15; + 1 2 #26

  11. Improved Key Generation For Gentry's Fully Homomorphic Encryption Scheme

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Improved Key Generation For Gentry's Fully Homomorphic Encryption Scheme P. Scholl and N.P. Smart scheme was the slow key generation process. Gentry and Halevi provided a fast technique for 2-power cyclo. In particular they focused on the field generated by the polynomial F(X) = X2n + 1, but they noted

  12. A pressure control scheme for air brakes in commercial vehicles 

    E-Print Network [OSTI]

    Bowlin, Christopher Leland

    2007-04-25

    This research is focused on developing a control scheme for regulating the pressure in the brake chamber of an air brake system found in most commercial vehicles like trucks, tractor-trailers and buses. Such a control scheme can be used...

  13. Cryptanalysis of a recent two factor authentication scheme

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Centre Dublin City University Ballymun, Dublin 9, Ireland. mike.scott@certivox.com Abstract. Very recently a scheme has been proposed by Wang and Ma for a robust smart-card based password authentication scheme, which claims to be secure against a Smart Card security breach. In this short note we attempt

  14. Wireless sensor networks under the random pairwise key predistribution scheme

    E-Print Network [OSTI]

    Yagan, Osman

    Wireless sensor networks under the random pairwise key predistribution scheme: Can resiliency, College Park, MD 20742. Email: armand@isr.umd.edu Abstract--We investigate the resiliency of wireless the classical key predistribution scheme of Eschenauer and Gligor. Keywords: Wireless sensor networks, Security

  15. Journey data based arrival forecasting for bicycle hire schemes

    E-Print Network [OSTI]

    Imperial College, London

    Journey data based arrival forecasting for bicycle hire schemes Marcel C. Guenther and Jeremy T. The global emergence of city bicycle hire schemes has re- cently received a lot of attention of future bicycle migration trends, as these assist service providers to ensure availability of bicycles

  16. Applications and meshes The GradCell scheme

    E-Print Network [OSTI]

    Herbin, Raphaèle

    de Montpellier 3 Université Paris Est june 22-24th 2009 L. Agelas1, D. Di Pietro1, J. Droniou2, I Experiments Applications Basin Modeling Reservoir simulation CO2 geological storage L. Agelas1, D. Di Pietro1 Applications and meshes The GradCell scheme The O scheme Numerical Experiments Meshes: basin geometries L

  17. Key words. Emissions markets, Cap-and-trade schemes, Equilibrium models, Environmental MARKET DESIGN FOR EMISSION TRADING SCHEMES

    E-Print Network [OSTI]

    Carmona, Rene

    Key words. Emissions markets, Cap-and-trade schemes, Equilibrium models, Environmental Finance. MARKET DESIGN FOR EMISSION TRADING SCHEMES REN´E CARMONA , MAX FEHR , JURI HINZ , AND ARNAUD PORCHET to help policy makers and regulators understand the pros and the cons of the emissions markets. We propose

  18. Comparisons of High Order Hybrid Schemes Using a Parameter-free Discontinuity Detector

    E-Print Network [OSTI]

    Zha, Gecheng

    are beneficial, es- pecially the high order low diffusion schemes used in smooth regions. There are two key waves of WENO schemes in smooth regions tends to be more diffusive than the central differencing schemes variable obtained by TVDM compact schemes. Ravichandran[13] improves this type of schemes with a class

  19. Oil fields and Hilbert schemes Lorenzo Robbiano, Genova (Italy)

    E-Print Network [OSTI]

    Robbiano, Lorenzo

    Oil fields and Hilbert schemes Lorenzo Robbiano, Genova (Italy) In the realm of polynomial algebra measures of physical quantities in an oil field, see http://staff.fim.uni-passau.de/algebraic-oil

  20. An unconditionally stable rotational velocity-correction scheme for ...

    E-Print Network [OSTI]

    S. Dong

    2010-07-22

    Jun 2, 2010 ... iterations per time step in the semi-implicit scheme is also larger than the number .... Tables 6 and 7 summarize the mean drag coefficient and root-mean-square (

  1. Towards an Emissions Trading Scheme for Air Pollutants in India

    E-Print Network [OSTI]

    Duflo, Esther

    Emissions trading schemes have great potential to lower pollution while minimizing compliance costs for firms in many areas now subject to traditional command-and-control regulation. This paper connects experience with ...

  2. Robust and scalable scheme to generate large-scale entanglement...

    Office of Scientific and Technical Information (OSTI)

    an N-qubit W state among separated quantum nodes (cavity-QED systems) by using linear optics and postselections. The present scheme inherits the robustness of the Barrett-Kok...

  3. On Nonlocal Monotone Difference Schemes for Scalar Conservation ...

    E-Print Network [OSTI]

    Aug 3, 2005 ... {8], and to ... In Section 3, we study the stability in L1(Z) of the above difference scheme for ..... HUD _ UOHLMZ) é CHAilLipilUOil1.1(Z)At2'.

  4. DECOUPLED ENERGY STABLE SCHEMES FOR A PHASE-FIELD ...

    E-Print Network [OSTI]

    2014-04-24

    Phase-field, two-phase flow, Navier-Stokes, variable density, stability, energy stable ... The third objective is to validate this model and the proposed numerical schemes through careful ... with a thin, smooth transition region of width O(?).

  5. Improving multivariate Horner schemes with Monte Carlo tree search

    E-Print Network [OSTI]

    J. Kuipers; J. A. M. Vermaseren; A. Plaat; H. J. van den Herik

    2012-07-30

    Optimizing the cost of evaluating a polynomial is a classic problem in computer science. For polynomials in one variable, Horner's method provides a scheme for producing a computationally efficient form. For multivariate polynomials it is possible to generalize Horner's method, but this leaves freedom in the order of the variables. Traditionally, greedy schemes like most-occurring variable first are used. This simple textbook algorithm has given remarkably efficient results. Finding better algorithms has proved difficult. In trying to improve upon the greedy scheme we have implemented Monte Carlo tree search, a recent search method from the field of artificial intelligence. This results in better Horner schemes and reduces the cost of evaluating polynomials, sometimes by factors up to two.

  6. Transformation optics scheme for two-dimensional materials

    E-Print Network [OSTI]

    Kumar, Anshuman

    Two-dimensional optical materials, such as graphene, can be characterized by surface conductivity. So far, the transformation optics schemes have focused on three-dimensional properties such as permittivity ? and permeability ...

  7. Village adoption scheme : a model for rural development

    E-Print Network [OSTI]

    Nanavati, Shahid Sadruddin, 1961-

    2004-01-01

    The study describes a "Village Adoption Scheme" as a model for energising the rural economy in India and to slow down rural - urban migration which research has shown to be harmful to both; rural and urban people of India ...

  8. The reliability of a dialogue structure coding scheme

    E-Print Network [OSTI]

    Carletta, Jean; Isard, Amy; Isard, Stephen; Kowtko, Jacqueline C; Doherty-Sneddon, Gwyneth; Anderson, Anne H

    1997-01-01

    This papers describes the reliability of a dialogue structure coding scheme which is based on utterance function, game structure, and higher level transaction function, and which has been applied to a corpus of spontaneous ...

  9. Direct plasma injection scheme with various ion beams

    SciTech Connect (OSTI)

    Okamura, M.

    2010-09-15

    The laser ion source is one of the most powerful heavy ion sources. However, it is difficult to obtain good stability and to control its intense current. To overcome these difficulties, we proposed a new beam injection scheme called 'direct plasma injection scheme'. Following this it was established to provide various species with desired charge state as an intense accelerated beam. Carbon, aluminum and iron beams have been tested.

  10. Conformal Behavior at Four Loops and Scheme (In)Dependence

    E-Print Network [OSTI]

    Thomas A. Ryttov

    2014-10-01

    We search for infrared zeros of the beta function and evaluate the anomalous dimension of the mass at the associated fixed point for asymptotically free vector-like fermionic gauge theories with gauge group SU(N). The fixed points of the beta function are studied at the two, three and four loop level in two different explicit schemes. These are the modified regularization invariant, RI', scheme and the minimal momentum subtraction, mMOM, scheme. The search is performed in Landau gauge where the beta function of the gauge parameter vanishes. We then compare our findings to earlier identical investigations performed in the modified minimal subtraction, $\\bar{\\text{MS}}$, scheme. It is found that the value of the anomalous dimension of the mass is smaller at three and four loops than at two loops. This seems to be a generic pattern that is observed in all three different schemes. We then estimate the value of the anomalous dimension to be $\\gamma \\sim 0.225-0.375$ for twelve fundamental flavors and three colors, $\\gamma \\sim 0.500 - 0.593$ for two adjoint flavors and two colors and finally $\\gamma \\sim 1.12-1.70$ for two two-indexed flavors and three colors with the lower and upper bound set by the minimum and maximum value respectively over all three schemes and at three and four loops. Our analysis suggests that the former two theories lie in the conformal window while the latter belongs to the chirally broken phase.

  11. Industrial Steam System Process-Control Schemes: A BestPractices...

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

    control schemes can be applied to the following generic applications: * Temperature * Flow * Level * Pressure. A control system will use one or more of the above schemes to...

  12. The Influence of a CO2 Pricing Scheme on Distributed Energy Resources in California's Commercial Buildings

    E-Print Network [OSTI]

    Stadler, Michael

    2010-01-01

    The Influence of a CO2 Pricing Scheme on Distributed Energy5. Regional Results for the CO2 Pricing Scheme no-invest

  13. Inversion of seismic reflection traveltimes using a nonlinear optimization scheme

    SciTech Connect (OSTI)

    Pullammanappallil, S.K.; Louie, J.N. (Univ. of Nevada, Reno, NV (United States). Mackay School of Mines)

    1993-11-01

    The authors present the use of a nonlinear optimization scheme called generalized simulated annealing to invert seismic reflection times for velocities, reflector depths, and lengths. A finite-difference solution of the eikonal equation computes reflection traveltimes through the velocity model and avoids ray tracing. They test the optimization scheme on synthetic models and compare it with results from a linearized inversion. The synthetic tests illustrate that, unlike linear inversion schemes, the results obtained by the optimization scheme are independent of the initial model. The annealing method has the ability to produce a suite of models that satisfy the data equally well. They make use of this property to determine the uncertainties associated with the model parameters obtained. Synthetic examples demonstrate that allowing the reflector length to vary, along with its position, helps the optimization process obtain a better solution. The authors put this to use in imaging the Garlock fault, whose geometry at depth is poorly known. They use reflection times picked from shot gathers recorded along COCORP Mojave Line 5 to invert for the Garlock fault and velocities within the Cantil Basin below Fremont Valley, California. The velocities within the basin obtained by their optimization scheme are consistent with earlier studies, though their results suggest that the basin might extend 1--2 km further south. The reconstructed reflector seems to suggest shallowing of the dip of the Garlock fault at depth.

  14. A bottom-up analysis of including aviation within theEU's Emissions Trading Scheme

    E-Print Network [OSTI]

    Watson, Andrew

    A bottom-up analysis of including aviation within theEU's Emissions Trading Scheme Alice Bows-up analysis of including aviation within the EU's Emissions Trading Scheme Alice Bows & Kevin Anderson Tyndall's emissions trading scheme. Results indicate that unless the scheme adopts both an early baseline year

  15. Buffer Management Schemes for Supporting TCP in Gigabit Routers with Per-flow Queueing

    E-Print Network [OSTI]

    Stiliadis, Dimitrios

    - tection) [3] scheme to prevent lockout (where one connection monopolizes the link) and to prevent global

  16. Forward Security in Threshold Signature Schemes MICHEL ABDALLA SARA MINER y CHANATHIP NAMPREMPRE z

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Forward Security in Threshold Signature Schemes MICHEL ABDALLA #3; SARA MINER y CHANATHIP of the Bellare­Miner forward­secure signature scheme, which is Fiat­Shamir­based. One scheme uses multiplicative secret sharing, and we prove it forward­secure based on the security of the Bellare­Miner scheme. We

  17. A Multivariate based Threshold Ring Signature Scheme Albrecht Petzoldt1,2

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    A Multivariate based Threshold Ring Signature Scheme Albrecht Petzoldt1,2 , Stanislav Bulygin1.buchmann,Stanislav.Bulygin}@cased.de Abstract. In [16], Sakumoto et al. presented a new multivariate identification scheme, whose security is the first multivariate scheme of this type and generally the first multivariate signature scheme

  18. Compounding Secret Sharing Schemes E. Martinez-Moro, J. Mozo-Fernandez and C. Munuera 1

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    schemes. Key Words: Cryptography, Secret sharing schemes, Threshold schemes. Subject Classification: (MSC scheme realizing it. More generally we define the optimal information rate of the structure as () = sup in real life participants are, in a natural way, in a hierarchy and not on equal terms. Then, structures

  19. Low Magnetic Reynolds Number Hypersonic MHD Flow Using High Order WENO Schemes

    E-Print Network [OSTI]

    Zha, Gecheng

    diffusion scheme for 3D Navier-Stokes equa- tions. We present results for hypersonic laminar flows around diffusion E-CUSP (LDE) scheme with a fifth order WENO scheme was developed to resolve flow fields with shockLow Magnetic Reynolds Number Hypersonic MHD Flow Using High Order WENO Schemes Jaejin Lee , Manuel

  20. Set Theory as the Unified Scheme for Physics

    E-Print Network [OSTI]

    Andrey V. Novikov-Borodin

    2015-01-08

    The process of cognition is analysed to adjust the set theory to physical description. Postulates and basic definitions are revised. The specific sets of predicates, called presets, corresponding to the physical objects identified by an observer during cognition are introduced. Unlike sets, the presets are free of logical or set-theoretical paradoxes and may be consistently used in physical description. Schemes of cognition based on presets are considered. Being different logical systems, the relativistic and quantum theories, observations in modern cosmology cannot be consistently considered in one `unified physical theory', but they are in frames of introduced schemes of cognition.

  1. Crab Crossing Schemes and Studies for Electron Ion Collider

    SciTech Connect (OSTI)

    S. Ahmed, Y. Derbenev, V. Morozov, A. Castilla, G.A. Krafft, B. Yunn, Y. Zhang, J.R. Delayen

    2011-09-01

    This report shows our progress in crab crossing consideration for future electron-ion collider envisioned at JLab. In this design phase, we are evaluating two crabbing schemes viz., the deflecting and dispersive. The mathematical formulations and lattice design for these schemes are discussed in this paper. Numerical simulations involving particle tracking through a realistic deflecting RF cavity and optics illustrate the desired crab tilt of 25 mrad for 1.35 MV. Evolution of beam propagation are shown which provides the physical insight of the crabbing phenomenon.

  2. On-line supplement: The Turbulence Parameterization Scheme The turbulence scheme used in this work is adapted from a more comprehensive

    E-Print Network [OSTI]

    He, Yanping

    On-line supplement: The Turbulence Parameterization Scheme The turbulence scheme used in this work-gradient turbulent transfer processes for cloud-free conditions. Throughout this supplement w denotes vertical

  3. Energy-Efficient Routing Schemes for Wireless Sensor Networks

    E-Print Network [OSTI]

    Khan, Maleq

    -configuration. Data-centric routing is a new use- ful paradigm for energy-constrained sensor networks. The data coming config- urations and data-centric routing schemes to minimize en- ergy consumption for both random processes, Opti- mization, Sensor networks, Data-centric routing. I. INTRODUCTION AND OVERVIEW Advances

  4. A Distributed Public Key Caching Scheme in Large Wireless Networks

    E-Print Network [OSTI]

    Deng, Jing

    -constrained, in terms of computational power, battery energy, and on-board memory space. For example, the prototypeA Distributed Public Key Caching Scheme in Large Wireless Networks Yuan Kong Jing Deng Stephen R in wireless networks, the public keys of the nodes need to be widely available and signed by a Certificate

  5. Scheme independence as an inherent redundancy in quantum field theory

    E-Print Network [OSTI]

    Jose I. Latorre; Tim R. Morris

    2001-02-07

    The path integral formulation of Quantum Field Theory implies an infinite set of local, Schwinger-Dyson-like relations. Exact renormalization group equations can be cast as a particular instance of these relations. Furthermore, exact scheme independence is turned into a vector field transformation of the kernel of the exact renormalization group equation under field redefinitions.

  6. Minimal Schemes for Large Neutrino Mixings with Inverted Hierarchy

    E-Print Network [OSTI]

    Duane A. Dicus; Hong-Jian He; John N. Ng

    2002-05-17

    Existing oscillation data point to nonzero neutrino masses with large mixings. We analyze the generic features of the neutrino Majorana mass matrix with inverted hierarchy and construct realistic {\\it minimal schemes} for the neutrino mass matrix that can explain the large (but not maximal) \

  7. LMS: A Router Assisted Scheme for Reliable Multicast Christos Papadopoulos

    E-Print Network [OSTI]

    Papadopoulos, Christos

    1 LMS: A Router Assisted Scheme for Reliable Multicast Christos Papadopoulos University of Southern­weight Multicast Ser­ vices (LMS), which enhance the existing multicast model with simple forwarding services that do not require transport level actions. Using LMS, routers tag and steer transport­level control

  8. Pricing Web Services for Optimizing Resource Allocation An Implementation Scheme

    E-Print Network [OSTI]

    Lin, Zhangxi

    Pricing Web Services for Optimizing Resource Allocation ­ An Implementation Scheme Zhangxi Lin of Research Information Management Texas Tech University sathya.ramanathan@ttu.edu Abstract Web services upon open standards such as SOAP, WSDL, UDDI, and BPEL4WS, web services allow web-based applications

  9. A Version Numbering Scheme with a Useful Lexicographical Order

    E-Print Network [OSTI]

    Keller, Arthur M.

    A Version Numbering Scheme with a Useful Lexicographical Order Arthur M. Kellery Je rey D. Ullmanz Engineering Database. This e ort is funded in part by NSF grant IRI 91 16646. yArthur Keller's e-mail address records can be obtained in little more than the time it takes to access data of this bulk. Our primary

  10. Network Coding-Based Protection Scheme for Elastic Optical Networks

    E-Print Network [OSTI]

    Politècnica de Catalunya, Universitat

    speed transmissions achieved in fiber optical networks. Traditional optical networks consist of a fixed. Recently, optical networks are undergoing significant changes with the purpose of providing a flexible grid with protection schemes for the purpose of reducing power consumption. An additional goal for network providers

  11. A More Secure and Efficacious TTS Signature Scheme

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    . Moh's theory ([37]) for digital signatures, based on Tame Transformations or Tame Maps. Properties: multivariate, public­key, digital signature, finite field, tame transformation. Note from the authors (Tame Transformation Signatures) digital signature schemes belong to this extended family. We propose

  12. A More Secure and Efficacious TTS Signature Scheme

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    . Moh's theory ([35]) for digital signatures, based on Tame Transformations or Tame Maps. Properties: multivariate, public-key, digital signature, finite field, tame transformation. Note from the authors (Tame Transformation Signatures) digital signature schemes belong to this extended family. We propose

  13. A new blowdown compensation scheme for boiler leak detection

    E-Print Network [OSTI]

    Marquez, Horacio J.

    A new blowdown compensation scheme for boiler leak detection A. M. Pertew ,1 X. Sun ,1 R. Kent considers the blowdown effect in industrial boiler operation. This adds to the efficiency of recent advances in identification-based leak detection techniques of boiler steam- water systems. Keywords: Industrial Boilers, Tube

  14. DISCRETE DUALITY FINITE VOLUME SCHEMES FOR DOUBLY NONLINEAR DEGENERATE

    E-Print Network [OSTI]

    operators 17 3.4. Penalization operator 19 3.5. Discrete convection operator 20 3.6. Projection operators establish the existence and uniqueness of entropy solutions. We then turn to the construction and analysis and well-posedness 5 3. Discrete duality finite volume (DDFV) schemes 13 3.1. Construction of "double

  15. Energy Efficiency of Encryption Schemes Applied to Wireless Sensor Networks

    E-Print Network [OSTI]

    Heys, Howard

    Energy Efficiency of Encryption Schemes Applied to Wireless Sensor Networks Xueying Zhang, Howard M (ICC 2010), Cape Town, South Africa, May 2010, and "Energy Efficiency of Symmetric Key Cryptographic In this paper, we focus on the energy efficiency of secure communication in wireless sensor networks (WSNs). Our

  16. University of Alberta A MULTI-SPECTRAL DECIMATION SCHEME FOR

    E-Print Network [OSTI]

    Roberts, Malcolm

    University of Alberta A MULTI-SPECTRAL DECIMATION SCHEME FOR TURBULENCE SIMULATIONS by Malcolm Ian and Statistical Sciences c Malcolm Ian William Roberts Fall, 2006 Edmonton, Alberta Permission is hereby granted to the University of Alberta Libraries to reproduce single #12;copies of this thesis and to lend or sell such copies

  17. Optimal Suspicion Functions for Tardos Traitor Tracing Schemes

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Descriptors E.4 [Data]: Coding and Information Theory; G.1 [Mathematics of Computing]: Numerical Analysis; G.1 functions for Tardos traitor tracing schemes. In the simple decoder approach (computation of a score.6 [Numerical Analysis]: Optimization--Constrained optimization, Stochastic programming General Terms Design

  18. PICBIT: A Scheme System for the PIC Microcontroller

    E-Print Network [OSTI]

    Feeley, Marc

    PICBIT: A Scheme System for the PIC Microcontroller Marc Feeley / Universit´e de Montr´eal Danny which specifically targets the PIC microcontroller family. The PIC is a popular inexpensive single for the PIC microcontroller family which has even tighter memory constraints. 2 THE PIC MICROCONTROLLER

  19. PARTICLE SWARM OPTIMISATION AIDED MULTIUSER TRANSMISSION SCHEMES FOR MIMO COMMUNICATION

    E-Print Network [OSTI]

    Chen, Sheng

    . In this contribution, particle swarm optimisation (PSO) is invoked for designing optimal multiuser transmission (MUT-error-rate (MBER) linear MUT using PSO and we design a PSO aided MBER generalised vector precoding for nonlinear MUT. These PSO aided MUT techniques compare favourably with the state-of-the-art conventional schemes

  20. An Efficient Hierarchical Scheme for Locating Highly Mobile Users \\Lambda

    E-Print Network [OSTI]

    Fudos, Ioannis

    on the maximum number of the forwarding pointers and the other on the distance of the move. In addition, we, a scheme based on forwarding pointers is presented, that reduces the cost of the overall network the number of forwarding pointers that need to be traversed to locate a user, auxiliary caching techniques

  1. Cryptanalysis of Two Dynamic IDbased Remote User Authentication Schemes for

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    University, Harbin City 150001, China 2 Automobile Management Institute of PLA, Bengbu City 233011, China guessing attack under their non­tamper resistance assumption of the smart card; (2) It fails to provide of schemes. Keywords: Cryptanalysis, Authentication protocol, O#ine password guessing attack, Smart card

  2. Mathematical study of a petroleum-engineering scheme Robert EYMARD

    E-Print Network [OSTI]

    Herbin, Raphaèle

    Mathematical study of a petroleum-engineering scheme Robert EYMARD , Rapha`ele HERBIN , and Anthony MICHEL October 8, 2002 Abstract Models of two phase flows in porous media, used in petroleum engineering are assumed to be incompressible and immiscible (the petroleum engineering "dead-oil" model). Let us

  3. Embedded metal nanopatterns as a general scheme for enhanced

    E-Print Network [OSTI]

    Burns, Michael J.

    Embedded metal nanopatterns as a general scheme for enhanced broadband light absorption Fan Ye Published online 24 October 2014 Keywords broadband enhanced absorption, embedded metal nanopattern of dielectric or metallic nanoparticles or nanopatterns on top of, below, or embedded within a photovoltaic (PV

  4. Image Fusion schemes using ICA bases Nikolaos Mitianoudis, Tania Stathaki

    E-Print Network [OSTI]

    Mitianoudis, Nikolaos

    Image Fusion schemes using ICA bases Nikolaos Mitianoudis, Tania Stathaki Communications and Signal Processing group, Imperial College London, Exhibition Road, SW7 2AZ London, UK Abstract Image fusion as analysis and synthesis tools for image fusion by the fusion community. Using various fusion rules, one can

  5. The Software Invention Cube: a Classification Scheme for Software Inventions

    E-Print Network [OSTI]

    Klint, Paul

    The Software Invention Cube: a Classification Scheme for Software Inventions Jan A. Bergstra.science.uva.nl/~janb and Paul Klint Centrum voor Wiskunde en Informatica (CWI), Software Engineering Department and Informatics system aims at protecting inventions. The requirement that a software invention should make `a technical

  6. Gambit-C, a portable implementation of Scheme

    E-Print Network [OSTI]

    The ' -v ' option prints the system version string, system time stamp, ...... When even finer control is desired the build process can be decomposed into ...... The console implements a simple Scheme-friendly line-editing user-interface that is ..... Currently the compiler and interpreter use different methods, which can lead to ...

  7. CONSTRUCTING SECURE CONTENT-DEPENDENT WATERMARKING SCHEME USING HOMOMORPHIC ENCRYPTION

    E-Print Network [OSTI]

    Sun, Qibin

    CONSTRUCTING SECURE CONTENT-DEPENDENT WATERMARKING SCHEME USING HOMOMORPHIC ENCRYPTION Zhi Li.a-star.edu.sg ABSTRACT Content-dependent watermarking (CDWM) has been pro- posed as a solution to overcome the potential and cryptography. 1. INTRODUCTION Consider a simplified model of Spread-Spectrum (SS) water- marking. Let x

  8. Displacement Correction Scheme for MR-Guided Interstitial Laser Therapy

    E-Print Network [OSTI]

    van Vliet, Lucas J.

    Displacement Correction Scheme for MR-Guided Interstitial Laser Therapy S. Suprijanto1 , M.W. Vogel[1,3]. In the absence of motion, MR thermometry based on phase imaging is quite accurate[12 , F.M. Vos1 , H.A. Vrooman2,3 , and A.M. Vossepoel1 1 Pattern Recognition Group, Department

  9. Pricing Schemes for Metropolitan Traffic Data Markets Negin Golrezaei1

    E-Print Network [OSTI]

    Shahabi, Cyrus

    Marshall School of Business, University of Southern California, Los Angeles, CA 90089 {golrezae, nazerzad of the pricing schemes applicable to data marketplaces in the context of transportation traffic data. Traffic congestion is a growing problem in many metropolitan areas. It not only wastes our time and energy

  10. A SELF SYNCHRONISED SCHEME FOR AUTOMATED COMMUNICATION IN WIRELESS

    E-Print Network [OSTI]

    Kent, University of

    attached to sensor nodes have a limited transmission range, multi-hop communication is needed to flexiblyA SELF ­ SYNCHRONISED SCHEME FOR AUTOMATED COMMUNICATION IN WIRELESS SENSOR NETWORKS #Antonio Gonzalez-Velazquez1 , Ian W Marshall2 , Lionel Sacks1 1 Department of Electronic and electric engineering

  11. A unified enrichment scheme for fracture Safdar Abbas

    E-Print Network [OSTI]

    A unified enrichment scheme for fracture problems Safdar Abbas Thomas-Peter Fries AICES, RWTH XFEM in fracture mechanics Numerical examples (cohesionless cracks) Numerical examples (cohesive cracks) Conclusions Future outlook 2 #12;Motivation Outline Motivation XFEM in fracture mechanics Numerical examples

  12. Novel coupling scheme to control dynamics of coupled discrete systems

    E-Print Network [OSTI]

    Snehal M. Shekatkar; G. Ambika

    2015-08-08

    We present a new coupling scheme to control spatio-temporal patterns and chimeras on 1-d and 2-d lattices and random networks of discrete dynamical systems. The scheme involves coupling with an external lattice or network of damped systems. When the system network and external network are set in a feedback loop, the system network can be controlled to a homogeneous steady state or synchronized periodic state with suppression of the chaotic dynamics of the individual units. The control scheme has the advantage that its design does not require any prior information about the system dynamics or its parameters and works effectively for a range of parameters of the control network. We analyze the stability of the controlled steady state or amplitude death state of lattices using the theory of circulant matrices and Routh-Hurwitz's criterion for discrete systems and this helps to isolate regions of effective control in the relevant parameter planes. The conditions thus obtained are found to agree well with those obtained from direct numerical simulations in the specific context of lattices with logistic map and Henon map as on-site system dynamics. We show how chimera states developed in an experimentally realizable 2-d lattice can be controlled using this scheme. We propose this mechanism can provide a phenomenological model for the control of spatio-temporal patterns in coupled neurons due to non-synaptic coupling with the extra cellular medium. We extend the control scheme to regulate dynamics on random networks and adapt the master stability function method to analyze the stability of the controlled state for various topologies and coupling strengths.

  13. A New Scheme for Predicting Fair-Weather Cumulus

    SciTech Connect (OSTI)

    Berg, Larry K.; Stull, Roland B.

    2007-04-01

    A new parameterization for boundary layer cumulus clouds, called the cumulus potential (CuP) scheme, is introduced. Unlike many other parameterizations, the CuP scheme explicitly links the fair-weather clouds to the boundary-layer turbulence and accounts for the non-local nature of the turbulence. This scheme uses joint probability density functions (JPDFs) of virtual potential temperature and water-vapor mixing ratio, as well as the mean vertical profiles of virtual potential temperature, to predict the amount and size distribution of boundary layer cloud cover. This model considers the diversity of air parcels over a heterogeneous surface, and recognizes that some parcels rise above their lifting condensation level to become cumulus, while other parcels might rise as clear updrafts. This model has several unique features: 1) surface heterogeneity and boundary-layer turbulence is represented using the boundary layer JPDF of virtual potential temperature versus water-vapor mixing ratio, 2) clear and cloudy thermals are allowed to coexist at the same altitude, and 3) a range of cloud-base heights, cloud-top heights, and cloud thicknesses are predicted within any one cloud field, as observed. Using data from Boundary Layer Experiment 1996 and a model intercomparsion study using large eddy simulation (LES) based on the Barbados Oceanographic and Meteorological Experiment (BOMEX), the CuP scheme is compared to three other cumulus parameterizations: one based on relative humidity, a statistical scheme based on the saturation deficit, and a slab model. It is shown that the CuP model does a better job predicting the cloud-base height and the cloud-top height than three other parameterizations. The model also shows promise in predicting cloud cover, and is found to give better cloud-cover estimates than the three other cumulus parameterizations. In ongoing work supported by the US Department of Energy¹s Atmospheric Radiation Measurement Program, the CuP scheme is being implemented in the Weather Research and Forecasting (WRF) model, in which it replaces the ad-hoc trigger function in an existing cumulus parameterization.

  14. Controlling quantum systems by embedded dynamical decoupling schemes

    E-Print Network [OSTI]

    Oliver Kern; Gernot Alber

    2005-06-05

    A dynamical decoupling method is presented which is based on embedding a deterministic decoupling scheme into a stochastic one. This way it is possible to combine the advantages of both methods and to increase the suppression of undesired perturbations of quantum systems significantly even for long interaction times. As a first application the stabilization of a quantum memory is discussed which is perturbed by one-and two-qubit interactions.

  15. Nonlinearly consistent schemes for coupled problems in reactor analysis 

    E-Print Network [OSTI]

    Mahadevan, Vijay Subramaniam

    2007-04-25

    the coupling strategies currently in use and put forth their deficiencies. 4 head2right Explain the basic theory for our new coupling strategy and how the deficiencies in current schemes can be overcome head2right Discuss some stable numerical... problems arising in coupled physics. Based on the consolidated work concerning the theory of nonlinear properties of numerical methods by several researchers like Hairer E, Wanner G on solving non-stiff and stiff ODEs[7,8], Dekker K, Verver J...

  16. Loss analysis of thermal reservoirs for electrical energy storage schemes

    E-Print Network [OSTI]

    White, Alexander

    2011-05-14

    , will inevitably lead to a greater interest in large-scale electrical energy storage schemes. In par- ticular, the expanding fraction of electricity produced by wind turbines will require either backup or storage capacity to cover extended periods of wind lull... phase change materials,” Energy Conversion and Management, vol. 45, pp. 263–275, 2004. [3] C. Bullough, C. Gatzen, C. Jakiel, M. Koller, A. Nowi, and S. Zunft, “Advanced adiabatic compressed air energy storage for the integration of wind energy,” in Proc...

  17. An adaptive nonlinear MOS scheme for precipitation forecasts using neural networks

    E-Print Network [OSTI]

    Hsieh, William

    An adaptive nonlinear MOS scheme for precipitation forecasts using neural networks Yuval, William W A novel neural network (NN) based scheme performs nonlinear Model Output Statistics (MOS) for generating

  18. The impact of the European Union Emissions Trading Scheme on US aviation

    E-Print Network [OSTI]

    Malina, Robert

    We estimate the economic impacts on US airlines that may arise from the inclusion of aviation in the European Union Emissions Trading Scheme from 2012 to 2020. We find that the Scheme would only have a small impact on US ...

  19. How do CSR rating schemes influence corporate behavior? : lessons from the utility industry

    E-Print Network [OSTI]

    Rutledge, Elisabeth Lea

    2015-01-01

    Ninety-three percent of the world's largest 250 companies report data to voluntary corporate social responsibility (CSR) rating schemes, and over 380 CSR rating schemes exist to assess companies' corporate actions. While ...

  20. Introduction to nuclear fusion Modelling Finite volume scheme Formal asymptotics Summary Magnetized Target Fusion: Insights from

    E-Print Network [OSTI]

    Fournier, John J.F.

    Introduction to nuclear fusion Modelling Finite volume scheme Formal asymptotics Summary Magnetized, Committee Member November 28, 2014 Michael Lindstrom Magnetized Target Fusion #12;Introduction to nuclear Target Fusion #12;Introduction to nuclear fusion Modelling Finite volume scheme Formal asymptotics

  1. Research Module: Scheme 2A. N-Benzylation Using Benzyl Bromide 63 Scheme 2 Part A: Redissolve in Methanol

    E-Print Network [OSTI]

    Jasperse, Craig P.

    in Methanol 1. Turn hot plate to 5. 2. To the flask with your product 3 from Scheme 1, attach a condener with gentle water flow. 3. Add 15 mL of methanol. · For 4-methoxy compoud 3c, you may need to add 20 mL of methanol, since the 4-methoxy substrates is probably less soluble. 4. Heat the mixture on the hot plate

  2. PROPOSAL OF A FINANCING SCHEME FOR A THIRD NPP IN BRAZIL

    SciTech Connect (OSTI)

    Filho, Z.D.T.

    2004-10-06

    This presentation discusses a proposal of a financing scheme for a third nuclear power plant in Brazil.

  3. CX-000104: Categorical Exclusion Determination

    Broader source: Energy.gov [DOE]

    Pedro Bay Native Village Technical Consulting Services for Mini Hydropower Feasibility StudyCX(s) Applied: A9, A11Date: 12/04/2009Location(s): AlaskaOffice(s): Energy Efficiency and Renewable Energy

  4. On the effect of INQUERY term-weighting scheme on query-sensitive similarity measures 

    E-Print Network [OSTI]

    Kini, Ananth Ullal

    2006-04-12

    have shown QSS measures to positively influence the outcome of a clustering procedure. These studies have used QSS measures in conjunction with the ltc term-weighting scheme. Several term-weighting schemes have superseded the ltc term-weighing scheme...

  5. Adaptive Energy Saving Scheme for Downlink Elastic Traffic in Wireless Networks

    E-Print Network [OSTI]

    Bahk, Saewoong

    Adaptive Energy Saving Scheme for Downlink Elastic Traffic in Wireless Networks Jongwook Lee, we propose several adaptive energy saving schemes that consider throughput and energy saving simultaneously. The proposed schemes are designed for an efficient tradeoff between throughput and energy saving

  6. RELATIVE FOURIER-MUKAI TRANSFORMS FOR WEIERSTRASS FIBRATIONS, ABELIAN SCHEMES AND FANO FIBRATIONS

    E-Print Network [OSTI]

    Martín, Ana Cristina López

    RELATIVE FOURIER-MUKAI TRANSFORMS FOR WEIERSTRASS FIBRATIONS, ABELIAN SCHEMES AND FANO FIBRATIONS the group of relative Fourier-Mukai transforms for Weierstraß fibrations, abelian schemes and Fano or anti schemes over an arbitrary base we prove that if two of them are relative Fourier-Mukai partners

  7. IEEE COMMUNICATIONS LETTERS, VOL. 17, NO. 1, JANUARY 2013 127 Capacity of Zero-Outage Scheme

    E-Print Network [OSTI]

    Candan, Cagatay

    IEEE COMMUNICATIONS LETTERS, VOL. 17, NO. 1, JANUARY 2013 127 Capacity of Zero-Outage Scheme Under Imprecise Channel State Information C¸ a~gatay Candan Abstract--The capacity of zero-outage scheme-to-noise-ratio fluctuates and the scheme suffers from com- munication outages. Exact analytical expressions characterizing

  8. Energy-Efficiency of Cooperative Sensing Schemes in Ad hoc WLAN Cognitive Radios

    E-Print Network [OSTI]

    Namboodiri, Vinod

    Energy-Efficiency of Cooperative Sensing Schemes in Ad hoc WLAN Cognitive Radios Reshma Syeda, we study and analyse the energy efficiency of two generic cooperative sensing schemes in an ad hoc a comparative numerical analysis to demonstrate the amount of energy savings of the proposed cooperative schemes

  9. TU/e -Savings schemes 2011 Personnel Department 8-12-2010

    E-Print Network [OSTI]

    Franssen, Michael

    12 TU/e - Savings schemes 2011 Personnel Department 8-12-2010 The TU/e offers you the opportunity to participate in a salary savings scheme (spaarloonregeling). There are a number of general rules for you ""course-of-life""arrangement in the same year. Salary savings scheme TU/e staff can save up to a certain

  10. Decoupled energy-law preserving numerical schemes for the Cahn-Hilliard-Darcy system

    E-Print Network [OSTI]

    Decoupled energy-law preserving numerical schemes for the Cahn-Hilliard-Darcy system Daozhi Han novel decoupled energy-law preserving numerical schemes for solving the Cahn- Hilliard-Darcy (CHD a discrete energy law with a time- step constraint, while the second scheme satisfies an energy law without

  11. Motivation Optimization scheme The problem Running conditions Tools Experiments Conclusions Optimizing the execution of a parallel meteorology

    E-Print Network [OSTI]

    Giménez, Domingo

    Motivation Optimization scheme The problem Running conditions Tools Experiments Conclusions 2009 #12;Motivation Optimization scheme The problem Running conditions Tools Experiments Conclusions Contents 1 Motivation 2 Optimization scheme 3 The problem 4 Running conditions 5 Tools 6 Experiments 7

  12. Power and Memory Efficient Hashing Schemes for Some Network Applications 

    E-Print Network [OSTI]

    Yu, Heeyeol

    2010-07-14

    Filter FF Fingerprint Filter SBF Segmented Bloom Filter SL Successful Lookup UL Unsuccessful Lookup viii SS Successful Search US Unsuccessful Search BMF Bloomier Filter PPC Parallel Packet Classifier MPC Multi-tiered Packet Classifier 2TPC 2-tiered Packet... III Power value by CACTI in PPC(31Kx1, 20 ports), 2TPC(29Kx1, 19 ports), and 3TPC(14Kx1,18 ports). ................. 38 IV Complexities of operations to o?-chip in four schemes. ........ 61 V On-chip memory usage for three traces. The load factor is 0...

  13. A demonstration of scheme independence in scalar ERGs

    E-Print Network [OSTI]

    Arnone, S; Morris, T R; Arnone, Stefano; Gatti, Antonio; Morris, Tim R.

    2002-01-01

    The standard demand for the quantum partition function to be invariant under the renormalization group transformation results in a general class of exact renormalization group equations, different in the form of the kernel. Physical quantities should not be sensitive to the particular choice of the kernel. Such scheme independence is elegantly illustrated in the scalar case by showing that, even with a general kernel, the one-loop beta function may be expressed only in terms of the effective action vertices, and in this way the universal result is recovered.

  14. A demonstration of scheme independence in scalar ERGs

    E-Print Network [OSTI]

    Stefano Arnone; Antonio Gatti; Tim R. Morris

    2002-05-15

    The standard demand for the quantum partition function to be invariant under the renormalization group transformation results in a general class of exact renormalization group equations, different in the form of the kernel. Physical quantities should not be sensitive to the particular choice of the kernel. Such scheme independence is elegantly illustrated in the scalar case by showing that, even with a general kernel, the one-loop beta function may be expressed only in terms of the effective action vertices, and in this way the universal result is recovered.

  15. Proposal for new experimental schemes to realize the Avogadro constant

    E-Print Network [OSTI]

    Biraben, F; Clad, P; Genevs, G; Gournay, P; Guellati-Khlifa, S; Julien, L; Juncar, P; De Mirandes, E; Nez, F

    2006-01-01

    We propose two experimental schemes to determine and so to realize the Avogadro constant $N\\_{A}$ at the level of 10$^{-7}$ or better with a watt balance experiment and a cold atom experiment measuring $h/m(X)$ (where $h$ is the Planck constant and $m(X)$ the mass of the atom $X$). We give some prospects about achievable uncertainties and we discuss the opportunity to test the existence of possible unknown correction factors for the Josephson effect and quantum Hall effect.

  16. Error-prevention scheme with two pairs of qubits

    E-Print Network [OSTI]

    Chu, Shih-I; Yang, Chui-Ping; Han, Siyuan

    2002-09-04

    Ei jue ie j&5ue je i& , e iP$0,1% @6#!. The expressions for HS and HSB are as follows: HS5e0~s I z 1s II z !, *Email address: cpyang@floquet.chem.ku.edu †Email address: sichu@ku.edu ‡ Email address: han@ku.eduError-prevention scheme Chui-Ping Yang.... The sche two pairs of qubits and through error-prevention proc through a decoherence-free subspace for collective p pairs; leakage out of the encoding space due to amp addition, how to construct decoherence-free states for n discussed. DOI: 10.1103/Phys...

  17. High-resolution methods for preserving the sum of mass fractions: improved ?-scheme and an alternative

    SciTech Connect (OSTI)

    Syamlal, Madhava; Benyahia, Sofiane

    2013-11-20

    When high resolution convection schemes are used for discretizing chemical species mass balance equations, the mass fractions are not guaranteed to add to one. We show that a proposed remedy called ?-scheme (Darwish and Moukalled, Comput.Methods Appl.Mech. Engrg. 192 (2003): 1711) will degrade to a diffusive first-order scheme when a chemical species vanishes from the mixture, for example, because of chemical reactions. We propose an improvement to the ?-scheme to overcome this problem. Furthermore, a computationally efficient alternative scheme is proposed and evaluated with several examples, to quantify the improvements in the accuracy and the computational time.

  18. An Extended Network Coding Opportunity Discovery Scheme in Wireless Networks

    E-Print Network [OSTI]

    Zhao, Yunlong; Iwai, Masayuki; Sezaki, Kaoru; Tobe, Yoshito; 10.5121/ijcnc.2012.4106

    2012-01-01

    Network coding is known as a promising approach to improve wireless network performance. How to discover the coding opportunity in relay nodes is really important for it. There are more coding chances, there are more times it can improve network throughput by network coding operation. In this paper, an extended network coding opportunity discovery scheme (ExCODE) is proposed, which is realized by appending the current node ID and all its 1-hop neighbors' IDs to the packet. ExCODE enables the next hop relay node to know which nodes else have already overheard the packet, so it can discover the potential coding opportunities as much as possible. ExCODE expands the region of discovering coding chance to n-hops, and have more opportunities to execute network coding operation in each relay node. At last, we implement ExCODE over the AODV protocol, and efficiency of the proposed mechanism is demonstrated with NS2 simulations, compared to the existing coding opportunity discovery scheme.

  19. Simple rules help select best hydrocarbon distillation scheme

    SciTech Connect (OSTI)

    Sanchezllanes, M.T.; Perez, A.L.; Martinez, M.P.; Aguilar-Rodriguez, E.; Rosal, R. del )

    1993-12-06

    Separation economics depend mainly on investment for major equipment and energy consumption. This relationship, together with the fact that, in most cases, many alternative schemes will be proposed, make it essential to find an optimum scheme that minimizes overall costs. Practical solutions are found by applying heuristics -- exploratory problem-solving techniques that eliminate alternatives without applying rigorous mathematical procedures. These techniques have been applied to a case study. In the case study, a hydrocarbon mixture will be transported through a pipeline to a fractionation plant, where it will be separated into commercial products for distribution. The fractionation will consist of a simple train of distillation columns, the sequence of which will be defined by applying heuristic rules and determining the required thermal duties for each column. The facility must separate ethane, propane and mixed butanes, natural gasoline (light straight-run, or LSR, gasoline), and condensate (heavy naphtha). The ethane will be delivered to an ethylene plant as a gaseous stream, the propane and butanes will be stored in cryogenic tanks, and the gasoline and heavy naphtha also will be stored.

  20. A new configurational bias scheme for sampling supramolecular structures

    E-Print Network [OSTI]

    Robin De Gernier; Tine Curk; Galina V. Dubacheva; Ralf P. Richter; Bortolo M. Mognetti

    2014-12-09

    We present a new simulation scheme which allows an efficient sampling of reconfigurable supramolecular structures made of polymeric constructs functionalized by reactive binding sites. The algorithm is based on the configurational bias scheme of Siepmann and Frenkel and is powered by the possibility of changing the topology of the supramolecular network by a non-local Monte Carlo algorithm. Such plan is accomplished by a multi-scale modelling that merges coarse-grained simulations, describing the typical polymer conformations, with experimental results accounting for free energy terms involved in the reactions of the active sites. We test the new algorithm for a system of DNA coated colloids for which we compute the hybridisation free energy cost associated to the binding of tethered single stranded DNAs terminated by short sequences of complementary nucleotides. In order to demonstrate the versatility of our method, we also consider polymers functionalized by receptors that bind a surface decorated by ligands. In particular we compute the density of states of adsorbed polymers as a function of the number of ligand-receptor complexes formed. Such a quantity can be used to study the conformational properties of adsorbed polymers useful when engineering adsorption with tailored properties. We successfully compare the results with the predictions of a mean field theory. We believe that the proposed method will be a useful tool to investigate supramolecular structures resulting from direct interactions between functionalized polymers for which efficient numerical methodologies of investigation are still lacking.

  1. Regulation control and energy management scheme for wireless power transfer

    DOE Patents [OSTI]

    Miller, John M.

    2015-12-29

    Power transfer rate at a charging facility can be maximized by employing a feedback scheme. The state of charge (SOC) and temperature of the regenerative energy storage system (RESS) pack of a vehicle is monitored to determine the load due to the RESS pack. An optimal frequency that cancels the imaginary component of the input impedance for the output signal from a grid converter is calculated from the load of the RESS pack, and a frequency offset f* is made to the nominal frequency f.sub.0 of the grid converter output based on the resonance frequency of a magnetically coupled circuit. The optimal frequency can maximize the efficiency of the power transfer. Further, an optimal grid converter duty ratio d* can be derived from the charge rate of the RESS pack. The grid converter duty ratio d* regulates wireless power transfer (WPT) power level.

  2. Energy-Efficient Transmission Schemes in Cooperative Cellular Systems

    E-Print Network [OSTI]

    Yang, Wei; Wang, Ying; Sun, Wanlu

    2010-01-01

    Energy-efficient communication is an important requirement for mobile devices, as the battery technology has not kept up with the growing requirements stemming from ubiquitous multimedia applications. This paper considers energy-efficient transmission schemes in cooperative cellular systems with unbalanced traffic between uplink and downlink. Theoretically, we derive the optimal transmission data rate, which minimizes the total energy consumption of battery-powered terminals per information bit. The energy-efficient cooperation regions are then investigated to illustrate the effects of relay locations on the energy-efficiency of the systems, and the optimal relay location is found for maximum energy-efficiency. Finally, numerical results are provided to demonstrate the tradeoff between energy-efficiency and spectral efficiency.

  3. Ordering schemes for parallel processing of certain mesh problems

    SciTech Connect (OSTI)

    O'Leary, D.

    1984-09-01

    In this work, some ordering schemes for mesh points are presented which enable algorithms such as the Gauss-Seidel or SOR iteration to be performed efficiently for the nine-point operator finite difference method on computers consisting of a two-dimensional grid of processors. Convergence results are presented for the discretization of u /SUB xx/ + u /SUB yy/ on a uniform mesh over a square, showing that the spectral radius of the iteration for these orderings is no worse than that for the standard row by row ordering of mesh points. Further applications of these mesh point orderings to network problems, more general finite difference operators, and picture processing problems are noted.

  4. Scheme for the detection of mixing processes in vacuum

    E-Print Network [OSTI]

    F. Fillion-Gourdeau; C. Lefebvre; S. MacLean

    2015-04-02

    A scheme for the detection of photons generated by vacuum mixing processes is proposed. The strategy consists in the utilization of a high numerical aperture parabolic mirror which tightly focuses two co-propagating laser beams with different frequencies. This produces a very high intensity region in the vicinity of the focus, where the photon-photon nonlinear interaction can then induce new electromagnetic radiation by wave mixing processes. These processes are investigated theoretically. The field at the focus is obtained from the Stratton-Chu vector diffraction theory, which can accomodate any configuration of an incoming laser beam. The number of photons generated is evaluated for an incident radially polarized beam. It is demonstrated that using this field configuration, vacuum mixing processes could be detected with envisaged laser technologies.

  5. Iron beam acceleration using direct plasma injection scheme

    SciTech Connect (OSTI)

    Okamura, M.; Kanesue, T.; Yamamoto, T.; Fuwa, Y.; RIKEN, Wako, Saitama 351-0198

    2014-02-15

    A new set of vanes of radio frequency quadrupole (RFQ) accelerator was commissioned using highly charged iron beam. To supply high intensity heavy ion beams to the RFQ, direct plasma injection scheme (DPIS) with a confinement solenoid was adopted. One of the difficulties to utilize the combination of DPIS and a solenoid field is a complexity of electro magnetic field at the beam extraction region, since biasing high static electric field for ion extraction, RFQ focusing field, and the solenoid magnetic field fill the same space simultaneously. To mitigate the complexity, a newly designed magnetic field clamps were used. The intense iron beam was observed with bunched structure and the total accelerated current reached 2.5 nC.

  6. D-meson production in the GM-VFN scheme

    E-Print Network [OSTI]

    B. A. Kniehl

    2006-08-10

    We study the inclusive hadrodroduction of D^0, D^+, D^{*+}, and D_s^+ mesons at next-to-leading order in the parton model of quantum chromodynamics endowed with universal non-perturbative fragmentation functions (FFs) fitted to e^+e^- annihilation data from CERN LEP1. Working in the general-mass variable-flavor-number scheme, we resum the large logarithms through the evolution of the FFs and, at the same time, retain the full dependence on the charm-quark mass without additional theoretical assumptions. In this way, the cross section distributions in transverse momentum recently measured by the CDF Collaboration in run II at the Fermilab Tevatron are described within errors.

  7. Impact of Geoengineering Schemes on the Global Hydrological Cycle

    SciTech Connect (OSTI)

    Bala, G; Duffy, P; Taylor, K

    2007-12-07

    The rapidly rising CO{sub 2} level in the atmosphere has led to proposals of climate stabilization via 'Geoengineering' schemes that would mitigate climate change by intentionally reducing the solar radiation incident on earth's surface. In this paper, we address the impact of these climate stabilization schemes on the global hydrological cycle, using equilibrium simulations from an atmospheric general circulation model coupled to a slab ocean model. We show that insolation reductions sufficient to offset global-scale temperature increases lead to a decrease in the intensity of the global hydrologic cycle. This occurs because solar forcing is more effective in driving changes in global mean evaporation than is CO{sub 2} forcing of a similar magnitude. In the model used here, the hydrologic sensitivity, defined as the percentage change in global mean precipitation per degree warming, is 2.4% for solar forcing, but only 1.5% for CO{sub 2} forcing. Although other models and the climate system itself may differ quantitatively from this result, the conclusion can be understood based on simple considerations of the surface energy budget and thus is likely to be robust. Compared to changing temperature by altering greenhouse gas concentrations, changing temperature by varying insolation results in larger changes in net radiative fluxes at the surface; these are compensated by larger changes in latent and sensible heat fluxes. Hence the hydrological cycle is more sensitive to temperature adjustment via changes in insolation than changes in greenhouse gases. This implies that an alteration in solar forcing might offset temperature changes or hydrological changes from greenhouse warming, but could not cancel both at once.

  8. PUBLICATION SCHEME 2009 Under the Freedom of Information Act 2000 (FOI Act), all public authorities are required to

    E-Print Network [OSTI]

    Birmingham, University of

    PUBLICATION SCHEME 2009 Under the Freedom of Information Act 2000 (FOI Act), all public authorities the Information Commissioner has approved a new model publication scheme which all public authorities are required The Model Scheme Environmental Information Accessing information covered by this publication scheme

  9. Finite-difference schemes for elastic waves based on the integration approach

    SciTech Connect (OSTI)

    Zahradnik, J. (Charles Univ., Prague (Czech Republic). Faculty of Mathematics and Physics); O'Leary, P. (Univ. of Wyoming, Laramie, WY (United States). Dept. of Mathematics); Sochacki, J. (James Madison Univ., Harrisonburg, VA (United States). Dept. of Mathematics)

    1994-06-01

    The authors present a second order explicit finite-difference scheme for elastic waves in 2-D nonhomogeneous media. These schemes are based on integrating the equations of motion and the stress-free surface conditions across the discontinuities before discretizing them on a grid. As an alternative for the free-surface treatment, a scheme using zero density above the surface is suggested. This scheme is first order and is shown to be a natural consequence of the integrated equations of motion and is called a vacuum formalism. These schemes remove instabilities encountered in earlier integration schemes. The consistency study reveals a close link between the vacuum formalism and the integrated/discretized stress-free condition, giving priority to the vacuum formalism when a material discontinuity reaches the free surface. The two presented free-surface treatments coincide in the sense of the limit (grid size [yields] 0) for lateral homogeneity at or near the free surface.

  10. Symmetric Ternary Quantum Homomorphic Encryption Schemes Based on the Ternary Quantum One-Time Pad

    E-Print Network [OSTI]

    Yuqi Wang; Kun She; Qingbin Luo; Fan Yang; Chao Zhao

    2015-05-12

    Aiming at a ternary quantum logic circuit, four symmetric ternary quantum homomorphic encryption schemes, based on ternary quantum one-time protocol, were presented. First, for a one-qutrit rotation gate, a homomorphic quantum encryption scheme was constructed. Second, in view of the synthesis of a 3x3 general unitary transformation, another one-qutrit quantum homomorphic encryption scheme was proposed. Third, according to the one-qutrit scheme, the two-qutrit quantum homomorphic encryption scheme about GCX(m') gate was constructed and was further generalized to the n-qutrit unitary matrix case. Finally, the security of these schemes was analyzed from two perspectives. It could be concluded that the attacker can correctly guess the encryption key with a maximum probability ${p_k} = {1 \\mathord{\\left/ {\\vphantom {1 {{3^{3n}}}}} \\right. \\kern-\

  11. A Data Gathering Scheme in Wireless Sensor Networks Based on Synchronization of Chaotic Spiking Oscillator Networks

    SciTech Connect (OSTI)

    Nakano, Hidehiro; Utani, Akihide; Miyauchi, Arata; Yamamoto, Hisao [Tokyo City University (Japan)

    2011-04-19

    This paper studies chaos-based data gathering scheme in multiple sink wireless sensor networks. In the proposed scheme, each wireless sensor node has a simple chaotic oscillator. The oscillators generate spike signals with chaotic interspike intervals, and are impulsively coupled by the signals via wireless communication. Each wireless sensor node transmits and receives sensor information only in the timing of the couplings. The proposed scheme can exhibit various chaos synchronous phenomena and their breakdown phenomena, and can effectively gather sensor information with the significantly small number of transmissions and receptions compared with the conventional scheme. Also, the proposed scheme can flexibly adapt various wireless sensor networks not only with a single sink node but also with multiple sink nodes. This paper introduces our previous works. Through simulation experiments, we show effectiveness of the proposed scheme and discuss its development potential.

  12. Coding Schemes for Physical Layer Network Coding Over a Two-Way Relay Channel 

    E-Print Network [OSTI]

    Hern, Brett Michael

    2013-08-09

    MLC scheme. : : : : : : : : : : : : : : : : : : : : 36 6 ?Rf (hA; hB) vs. for each function f 2 F with the proposed coding scheme using CF decoding. : : : : : : : : : : : : : : : : : : : 37 7 I(YR; f(XA; XB)) vs. for each linear function f 2 FGF... for the proposed scheme with 4-qam when hA = 1 as a function of hB. : : : : : : : : : : : : : : : : : : : : : : : : : : 42 10 Outage experiment results with 4-qam signalling. : : : : : : : : : : : 45 11 Outage experiment results with 4-qam signalling. Proposed...

  13. Impacts of Microphysical Scheme on Convective and Stratiform Characteristics in Two High Precipitation Squall Line Events

    SciTech Connect (OSTI)

    Wu, Di; Dong, Xiquan; Xi, Baike; Feng, Zhe; Kennedy, Aaron; Mullendore, Gretchen; Gilmore, Matthew; Tao, Wei-Kuo

    2013-10-04

    This study investigates the impact of snow, graupel, and hail processes on the simulated squall lines over the Southern Great Plains in the United States. Weather Research and Forecasting (WRF) model is used to simulate two squall line events in May 2007, and the results are validated against radar and surface observations in Oklahoma. Several microphysics schemes are tested in this study, including WRF 5-Class Microphysics Scheme (WSM5), WRF 6-Class Microphysics Scheme (WSM6), Goddard Three Ice scheme (Goddard 3-ice) with graupel, Goddard Two Ice scheme (Goddard 2-ice), and Goddard 3-ice hail scheme. The simulated surface precipitation is sensitive to the microphysics scheme, and especially to whether graupel or hail category is included. All of the three ice (3-ice) schemes overestimated the total precipitation, within which WSM6 has the highest overestimation. Two ice (2-ice) schemes, missing a graupel/hail category, produced less total precipitation than 3-ice schemes. By applying a radar-based convective/stratiform partitioning algorithm, we find that by including the graupel/hail processes, there is an increase in areal coverage, precipitation intensity, updraft and downdraft intensity in convective region and a reduction of areal coverage and its precipitation intensity in stratiform region. For vertical structures, all the bulk schemes, especially 2-ice schemes, have the highest reflectivity located at upper levels (~8 km), which is unrealistic compared to observations. In addition, this study shows the radar-based convective/stratiform partitioning algorithm can reasonably identify WRF simulated precipitation, wind and microphysics fields in both convective and stratiform regions.

  14. AN EFFICIENT SECOND ORDER IN TIME SCHEME FOR APPROXIMATING LONG TIME STATISTICAL PROPERTIES OF

    E-Print Network [OSTI]

    AN EFFICIENT SECOND ORDER IN TIME SCHEME FOR APPROXIMATING LONG TIME STATISTICAL PROPERTIES of the following efficient second order in time scheme for the 2D Navier-Stokes equation in a periodic box: 3n+1 - 4n + n-1 2k + (2n - n-1 ) · (2n - n-1 ) - n+1 = fn+1 , -n = n . The scheme is a combination of a 2

  15. A decoupled energy stable scheme for a hydrodynamic phase-field ...

    E-Print Network [OSTI]

    2015-12-02

    Oct 21, 2015 ... We develop a linear, first-order, decoupled, energy-stable scheme for a binary hydrodynamic phase field model of mixtures of nematic liquid ...

  16. WENO schemes on arbitrary unstructured meshes for laminar, transitional and turbulent flows

    SciTech Connect (OSTI)

    Tsoutsanis, Panagiotis, E-mail: panagiotis.tsoutsanis@cranfield.ac.uk; Antoniadis, Antonios Foivos, E-mail: a.f.antoniadis@cranfield.ac.uk; Drikakis, Dimitris, E-mail: d.drikakis@cranfield.ac.uk

    2014-01-01

    This paper presents the development and implementation of weighted-essentially-non-oscillatory (WENO) schemes for viscous flows on arbitrary unstructured grids. WENO schemes up to fifth-order accurate have been implemented in conjunction with hybrid and non-hybrid unstructured grids. The schemes are investigated with reference to numerical and experimental results for the Taylor–Green vortex, as well as for laminar and turbulent flows around a sphere, and the turbulent shock-wave boundary layer interaction flow problem. The results show that the accuracy of the schemes depends on the arbitrariness of shape and orientation of the unstructured mesh elements, as well as the compactness of directional stencils. The WENO schemes provide a more accurate numerical framework compared to second-order and third-order total variation diminishing (TVD) methods, however, the fifth-order version of the schemes is computationally too expensive to make the schemes practically usable. On the other hand, the third-order variant offers an excellent numerical framework in terms of accuracy and computational cost compared to the fifth-order WENO and second-order TVD schemes. Parallelisation of the CFD code (henceforth labelled as UCNS3D), where the schemes have been implemented, shows that the present methods offer very good scalable performance.

  17. Risk Assessment Scheme of Infection Transmission Indoors Incorporating the Impact of Resuspension

    E-Print Network [OSTI]

    You, Siming; Wan, Man Pun

    2015-01-01

    2002; 7. Goldmann DA. Transmission of viral respiratoryScheme of Infection Transmission Indoors 34. Krauter P,nosocomial tuberculosis transmission. Indoor Air, 1998; 8(

  18. A Milstein-type scheme without Lévy area terms for SDEs driven by ...

    E-Print Network [OSTI]

    A. Deya, A. Neuenkirch, S. Tindel

    2012-04-06

    Thus one has to rely on numerical methods for the simulation of these equations. So far, some numerical schemes for equations like (1) have already been ...

  19. The Influence of a CO2 Pricing Scheme on Distributed Energy Resources in California's Commercial Buildings

    E-Print Network [OSTI]

    Stadler, Michael

    2010-01-01

    J.L. Edwards, (2003), “Distributed Energy Resources CustomerGas-Fired Distributed Energy Resource Characterizations,”of a CO2 Pricing Scheme on Distributed Energy Resources in

  20. An Efficient, Energy Stable Scheme for the Cahn-Hilliard-Brinkman ...

    E-Print Network [OSTI]

    2012-06-09

    We present an unconditionally energy stable and uniquely solvable finite difference ... The scheme is based on a convex splitting of the discrete CH energy and.

  1. Prime Number-Based Hierarchical Data Labeling Scheme for Relational Databases

    E-Print Network [OSTI]

    Morozov, Serhiy

    2007-12-13

    reusable prime number labeling (rPNL) that reduces the effects of the mentioned weaknesses. The proposed scheme advantage is discussed in detail, proven mathematically, and experimentally confirmed....

  2. DOPING: a New Non-parametric Deprojection Scheme

    E-Print Network [OSTI]

    Dalia Chakrabarty; Laura Ferrarese

    2008-01-23

    We present a new non-parametric deprojection algorithm DOPING (Deprojection of Observed Photometry using and INverse Gambit), that is designed to extract the three dimensional luminosity density distribution $\\rho$, from the observed surface brightness profile of an astrophysical system such as a galaxy or a galaxy cluster, in a generalised geometry, while taking into account changes in the intrinsic shape of the system. The observable is the 2-D surface brightness distribution of the system. While the deprojection schemes presented hitherto have always worked within the limits of an assumed intrinsic geometry, in DOPING, geometry and inclination can be provided as inputs. The $\\rho$ that is most likely to project to the observed brightness data is sought; the maximisation of the likelihood is performed with the Metropolis algorithm. Unless the likelihood function is maximised, $\\rho$ is tweaked in shape and amplitude, while maintaining positivity, but otherwise the luminosity distribution is allowed to be completely free-form. Tests and applications of the algorithm are discussed.

  3. Beamforming-Based Broadcast Scheme for Multihop Wireless Networks with Transmission

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Beamforming-Based Broadcast Scheme for Multihop Wireless Networks with Transmission Range transmission power for a beamforming-based broadcast scheme in multihop wireless networks? To address wireless network, and demonstrated in terms of implicated nodes'ratio, power transmission gain

  4. A PFMIPv6 Scheme Based on Handover Failure Probability for Mobile Nodes

    E-Print Network [OSTI]

    Jang, Ju-Wook

    cost problem. This is due to Handover Initiate (HI) and/or Handover Acknowledge (HAck) message exchange a new PFMIPv6 scheme which employs the handover failure probability (to be determined by speed scheme is more efficient in choosing MAG with 47% reduction of handover latencies, 34% reduction

  5. Hybrid PID-fuzzy control scheme for managing energy resources in buildings

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Hybrid PID-fuzzy control scheme for managing energy resources in buildings Benjamin Paris, Julien: both indoor temperature regulation and energy resources management in buildings require the design-fuzzy scheme is proposed for managing energy resources in buildings, as the combination of two usual control

  6. Moving-Water Equilibria Preserving Central-Upwind Schemes for the Shallow Water Equations

    E-Print Network [OSTI]

    Kurganov, Alexander

    Moving-Water Equilibria Preserving Central-Upwind Schemes for the Shallow Water Equations Yuanzhen Cheng and Alexander Kurganov Abstract We construct a new second-order moving-water equilibria preserving central-upwind scheme for the one-dimensional Saint-Venant system of shallow water equations. Special

  7. Scalable Storage Scheme from Forward Key Rotation Chunbo Ma1,2

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Scalable Storage Scheme from Forward Key Rotation Chunbo Ma1,2 , Jun Ao3 , and Jianhua Li1 1 School@263.net Abstract. Kallahalla et al. presented a RSA-based Forward Key Rotation mechanism in secure storage present a Forward Key Rotation storage scheme based on discrete logarithm and discuss its security

  8. Augmentation of Rural Piped Water Schemes for Supply of drinking water to tanker fed villages.

    E-Print Network [OSTI]

    Sohoni, Milind

    -3000mm and biggest reservoirs like Tansa, Vaitarana and Bhatsa for supplying drinking water to Mumbai on the documentation of the existing schemes, they were mapped against the tanker fed villages using GIS. The schemes. This is the area that has a distinction of being the major supplier of drinking water to city of Mumbai through

  9. A gas-kinetic scheme for reactive ows Yongsheng Lian, Kun Xu*

    E-Print Network [OSTI]

    Xu, Kun

    A gas-kinetic scheme for reactive ¯ows Yongsheng Lian, Kun Xu* Department of Mathematics, Hong Kong in revised form 22 July 1999; accepted 22 July 1999 Abstract In this paper, the gas-kinetic BGK scheme for the compressible ¯ow equations is extended to chemical reactive ¯ow. The mass fraction of the unburnt gas

  10. Fourth Order Compact Difference Scheme for 3D Convection Diffusion Equation with

    E-Print Network [OSTI]

    Zhang, Jun

    Fourth Order Compact Difference Scheme for 3D Convection Diffusion Equation with Boundary Layers University, Washington, DC 20052, USA January 13, 2000 Abstract We present a fourth order compact finite and computational efficiency of the fourth order compact dif­ ference scheme with that of the standard central

  11. A Distributed Resource Block Assignment Scheme for Relay-Assisted Cellular Networks With Self-Organizing

    E-Print Network [OSTI]

    Yanikomeroglu, Halim

    (WTs), the number of Terminal Relays (TRs) naturally increases with the number of WTs. However, ef an autonomous resources coordination scheme. In this scheme, the TRs assign RBs to incoming WTs in a way that minimizes the number of hit occurrences at which the same RB is assigned to other WTs. The set of RBs

  12. Controlling Quantum Systems by Embedded Dynamical Decoupling Schemes O. Kern and G. Alber

    E-Print Network [OSTI]

    Controlling Quantum Systems by Embedded Dynamical Decoupling Schemes O. Kern and G. Alber Institut on embedding a deterministic decoupling scheme into a stochastic one. This way it is possible to combine the advantages of both methods and to increase the suppression of undesired perturbations of quantum systems

  13. PCRRD: A Pipeline-Based Concurrent Round-Robin Dispatching Scheme for Clos-Network Switches

    E-Print Network [OSTI]

    Chao, Jonathan

    PCRRD: A Pipeline-Based Concurrent Round-Robin Dispatching Scheme for Clos-Network Switches Eiji-based concurrent round-robin dispatching scheme, called PCRRD, for Clos-network switches. Our previ- ously proposed-performance switching systems. To relax the strict timing constraint of CRRD, we propose to use more than one scheduler

  14. Maximum Weight Matching Dispatching Scheme in Buffered Clos-Network Packet Switches

    E-Print Network [OSTI]

    Chao, Jonathan

    Maximum Weight Matching Dispatching Scheme in Buffered Clos-Network Packet Switches Roberto Rojas of Clos-network switches make them an alternative to single-stages switches for implementing large- size packet switches. This paper introduces a cell dispatching scheme, called maximum weight matching

  15. Energy Aware Power Allocation strategies for Multihop-Cooperative transmission schemes

    E-Print Network [OSTI]

    Spagnolini, Umberto

    1 Energy Aware Power Allocation strategies for Multihop-Cooperative transmission schemes S. Savazzi nodes are able to relay their packets. Designing multihop routing strategy together with energy scheme is known to be an energy aware strategy that allocate the power on each independent hop according

  16. Secure Demand Shaping for Smart Grid On constructing probabilistic demand response schemes

    E-Print Network [OSTI]

    Sastry, S. Shankar

    Secure Demand Shaping for Smart Grid On constructing probabilistic demand response schemes. Developing novel schemes for demand response in smart electric gird is an increasingly active research area/SCADA for demand response in smart infrastructures face the following dilemma: On one hand, in order to increase

  17. An Efficient Energy Curtailment Scheme For Outage Management in Smart Grid

    E-Print Network [OSTI]

    Durrani, Salman

    An Efficient Energy Curtailment Scheme For Outage Management in Smart Grid Wayes Tushar§, Jian--In this paper an efficient energy curtailment scheme is studied, which enables the power users of a smart grid. Considering the advantages of a two-way communications infrastructure for any future smart grid, a non

  18. Kelvin Nanotechnology Ltd (KNT) GUIDE TO INFORMATION AVAILABLE THROUGH OUR PUBLICATION SCHEME

    E-Print Network [OSTI]

    Glasgow, University of

    Kelvin Nanotechnology Ltd (KNT) GUIDE TO INFORMATION AVAILABLE THROUGH OUR PUBLICATION SCHEME it might cost. Kelvin Nanotechnology Ltd has adopted the Model Publication Scheme 2011 produced publication and explain why. Copyright Where Kelvin Nanotechnology Ltd holds the copyright in its published

  19. THE USE OF MSG DATA WITHIN A NEW TYPE OF SOLAR IRRADIANCE CALCULATION SCHEME

    E-Print Network [OSTI]

    Heinemann, Detlev

    THE USE OF MSG DATA WITHIN A NEW TYPE OF SOLAR IRRADIANCE CALCULATION SCHEME R. W. Mueller , H). Within this paper, the new type of the solar irradiance calculation scheme, including the functional treatment of the diurnal variation of the solar irradiance, is described. 1 INTRODUCTION Remote Sensing from

  20. A Communication-Based Appliance Scheduling Scheme for Consumer-Premise Energy Management Systems

    E-Print Network [OSTI]

    Snyder, Larry

    A Communication-Based Appliance Scheduling Scheme for Consumer-Premise Energy Management Systems Scheme for Consumer-Premise Energy Management Systems Chen Chen, K.G. Nagananda, Gang Xiong, Shalinee" appliances which consume power as they desire. An optimization problem is formulated for the energy

  1. Energy Aware Power Allocation strategies for Multihop-Cooperative transmission schemes

    E-Print Network [OSTI]

    Savazzi, Stefano

    1 Energy Aware Power Allocation strategies for Multihop-Cooperative transmission schemes S. Savazzi transmission this cooperative diversity yields to a meaningful energy savings and throughput enhancement [2 with a cooperative decoded relay- ing scheme in multihop wireless network and the corresponding transmitters power

  2. Energy Aware Power Allocation strategies for Multihop-Cooperative transmission schemes

    E-Print Network [OSTI]

    Savazzi, Stefano

    Energy Aware Power Allocation strategies for Multihop-Cooperative transmission schemes Stefano, cooperative diversity, power allocation, energy efficient transmission techniques, ad-hoc and sensors networks is focused on the optimization of trans- mitted power in a cooperative decoded relaying scheme for nodes

  3. Parallelizing Compilation Scheme for Reduction of Power Consumption of Chip Multiprocessors

    E-Print Network [OSTI]

    Kasahara, Hironori

    Parallelizing Compilation Scheme for Reduction of Power Consumption of Chip Multiprocessors Jun compilers for chip multi- processors are expected that allow us to parallelize program effectively. This paper proposes paralleliz- ing compilation scheme with power reduction control under the multi- grain

  4. An Augmented Lagrangian Mixed Finite Element Scheme for Saddle Point Problems \\Lambda

    E-Print Network [OSTI]

    Yang, Daoqi

    on the idea of iteratively penalizing the mixed finite element scheme. It is shown that the scheme has \\Delta /dx: Its mixed finite element approximations consist of constructing finite dimensional spaces [5 ); (9) where \\Pi is the L 2 projection operator onto Q. The convergence for this method is ku \\Gamma um

  5. A faster numerical scheme for a coupled system modelling soil erosion and sediment transport

    E-Print Network [OSTI]

    d'Orléans, Université

    A faster numerical scheme for a coupled system modelling soil erosion and sediment transport M flow and the bed sediment, are classically described by a well-established system coupling the shallow states and the positivity of both water depth and sediment concentration. Recently, finite volume schemes

  6. A COMPRESSIVE-SENSING BASED WATERMARKING SCHEME FOR SPARSE IMAGE TAMPERING IDENTIFICATION

    E-Print Network [OSTI]

    Tagliasacchi, Marco

    A COMPRESSIVE-SENSING BASED WATERMARKING SCHEME FOR SPARSE IMAGE TAMPERING IDENTIFICATION G describe a robust watermarking scheme for image tampering identification and localization. A compact are obtained, and then used to estimate the distortion of the received image. If tampering is suf- ficiently

  7. AN INNOVATIVE RTP-BASED RESIDENTIAL POWER SCHEDULING SCHEME FOR SMART GRIDS

    E-Print Network [OSTI]

    Snyder, Larry

    as demand response for residential power usage. In this scheme, the Energy Management Controller (EMCAN INNOVATIVE RTP-BASED RESIDENTIAL POWER SCHEDULING SCHEME FOR SMART GRIDS Chen Chen , Shalinee for consumers, but also reduce peak load and the variance between demand and supply, while avoiding the "rebound

  8. Research Summary Evaluation of the Better Woodlands for Wales Grant Scheme

    E-Print Network [OSTI]

    . The scheme was shown to have had small, but measurable impacts on carbon sequestration, biodiversity benefits. Methods o Carbon sequestration values draw upon the UK government's approach to valuing carbon. o Benefit that planted as a consequence of the BWW scheme. Carbon sequestration values show that over a 20-year time

  9. Running Scheme on a PIC microcontroller Marc Feeley (Universite de Montreal) and Danny Dube (Universite Laval)

    E-Print Network [OSTI]

    Feeley, Marc

    Running Scheme on a PIC microcontroller Marc Feeley (Universit´e de Montr´eal) and Danny Dub´e (Universit´e Laval) · Objective: create a Scheme system for PIC that is R4 RS conformant (except for file I/O) · The PIC is an inexpensive single-chip general purpose computer with little RAM Model Pins MIPS ROM RAM

  10. AMP: An Affinity-based Metadata Prefetching Scheme in Large-Scale Distributed Storage Systems

    E-Print Network [OSTI]

    Zhu, Yifeng

    1 AMP: An Affinity-based Metadata Prefetching Scheme in Large-Scale Distributed Storage Systems Lin significantly reduce access latency for I/O systems. In distributed storage systems, prefetching for metadata Prefetching (AMP) scheme is proposed for metadata servers in large-scale distributed storage systems

  11. Modeling the pairwise key predistribution scheme in the presence of unreliable links

    E-Print Network [OSTI]

    Yagan, Osman

    ) for a detailed survey of various key predistribution schemes for WSNs. With so many schemes available, a basic), Kyoto (Japan), June 2011. O. Yagan was with the Department of Electrical and Computer Engineering is with the Department of Electrical and Computer Engineering, and the Institute for Systems Research, University

  12. The Multivariate Probabilistic Encryption Scheme MQQENC Danilo Gligoroski and Simona Samardjiska

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    The Multivariate Probabilistic Encryption Scheme MQQ­ENC Danilo Gligoroski and Simona Samardjiska@item.ntnu.no, simonas@item.ntnu.no Abstract. We propose a new multivariate probabilistic encryption scheme­SIG, the trapdoor is constructed using quasigroup string transformations with multivariate quadratic quasi­ groups

  13. Table of Contents A Multivariate Signature Scheme with an almost cyclic public key . . . . . . . . . . . . . . . . . . . . . 2

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Table of Contents A Multivariate Signature Scheme with an almost cyclic public key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 #12;A Multivariate Signature Scheme with an almost cyclic public key Albrecht Petzoldt1,buchmann}@cdc.informatik.tu-darmstadt.de Abstract. Multivariate public key cryptography is one of the main approaches to guarantee the security

  14. Table of Contents A Multivariate Signature Scheme with an almost cyclic public key . . . . . . . . . . . . . . . . . . . . . 2

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Table of Contents A Multivariate Signature Scheme with an almost cyclic public key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 #12; A Multivariate Signature Scheme with an almost cyclic public key Albrecht Petzoldt 1,buchmann}@cdc.informatik.tu­darmstadt.de Abstract. Multivariate public key cryptography is one of the main approaches to guarantee the security

  15. The Multivariate Probabilistic Encryption Scheme MQQ-ENC Danilo Gligoroski and Simona Samardjiska

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    The Multivariate Probabilistic Encryption Scheme MQQ-ENC Danilo Gligoroski and Simona Samardjiska@item.ntnu.no, simonas@item.ntnu.no Abstract. We propose a new multivariate probabilistic encryption scheme-SIG, the trapdoor is constructed using quasigroup string transformations with multivariate quadratic quasi- groups

  16. PUBLISHED IN: PROCEEDINGS OF THE IEEE ICC 2013 1 Towards an Error Control Scheme for a

    E-Print Network [OSTI]

    Chatziantoniou, Damianos

    evaluation of its performance. An obvious use case for our scheme is the reliable delivery of softwarePUBLISHED IN: PROCEEDINGS OF THE IEEE ICC 2013 1 Towards an Error Control Scheme for a Publish for efficient content distribution. However, the design of efficient reliable transport protocols for multicast

  17. Cryptanalysis of an IDbased Password Authentication Scheme using Smart Cards and

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Cryptanalysis of an ID­based Password Authentication Scheme using Smart Cards and Fingerprints Michael Scott School of Computer Applications Dublin City University Ballymun, Dublin 9, Ireland. mike two ID­based password authen­ tication schemes for logging onto a remote network server using smart

  18. An energy-momentum-conserving temporal discretization scheme for adhesive contact problems

    E-Print Network [OSTI]

    An energy-momentum-conserving temporal discretization scheme for adhesive contact problems Sachin S' knowledge, none have been proposed for adhesive contact problems. In this work, an energy-momentum-conserving temporal discretization scheme for adhesive contact problems is proposed. A contact criterion is also

  19. ERROR BOUNDS FOR MONOTONE APPROXIMATION SCHEMES FOR HAMILTON-JACOBI-BELLMAN

    E-Print Network [OSTI]

    ERROR BOUNDS FOR MONOTONE APPROXIMATION SCHEMES FOR HAMILTON-JACOBI-BELLMAN EQUATIONS GUY BARLES AND ESPEN R. JAKOBSEN Abstract. We obtain error bounds for monotone approximation schemes of Hamilton-Jacobi, (almost) smooth supersolutions for the Hamilton-Jacobi-Bellman equation. 1. Introduction This paper

  20. A Distributed Fault/Intrusion-Tolerant Sensor Data Storage Scheme Based on Network Coding and

    E-Print Network [OSTI]

    Shen, Xuemin "Sherman"

    1 A Distributed Fault/Intrusion-Tolerant Sensor Data Storage Scheme Based on Network Coding/intrusion-tolerant data storage scheme based on network coding and homomorphic fingerprinting in volatile WSNs (Sherman) Shen, Fellow, IEEE Abstract--Recently, distributed data storage has gained in- creasing

  1. High Order Asymptotic Preserving Nodal Discontinuous Galerkin IMEX Schemes for the BGK Equation

    E-Print Network [OSTI]

    Li, Fengyan

    on the so-called micro-macro formulation of the kinetic equation which involves a natural decomposi- tion of the schemes are proposed: Scheme I is a direct formulation based on the micro-macro de- composition of the BGK hence how rarefied a gas is. In the zero limit of Knudsen number, a sufficient macroscopic model

  2. O. Goecke: Collective saving schemes LUH-Kolloquium ,,Versicherungs-und Finanzmathematik"

    E-Print Network [OSTI]

    Weber, Stefan

    schemes Risk Return-Transformation entrepreneur bank private saver real market own capital real investment (DAX) fixed inc. (REXP) money market 20- year indiv. saving plans: accrued capital #12;10 O. Goecke. Goecke: Collective saving schemes unit price follows exactly the market value of assets individual saving

  3. Signal Processing 87 (2007) 12641280 A robust content-based digital image watermarking scheme

    E-Print Network [OSTI]

    Qi, Xiaojun

    2007-01-01

    Signal Processing 87 (2007) 1264­1280 A robust content-based digital image watermarking scheme 30 November 2006 Abstract This paper presents a content-based digital image-watermarking scheme. The image content is represented by important feature points obtained by our image-texture-based adaptive

  4. Energy and helicity preserving schemes for hydro-and magnetohydro-dynamics flows with symmetry

    E-Print Network [OSTI]

    Liu, Jian-Guo

    Energy and helicity preserving schemes for hydro- and magnetohydro-dynamics flows with symmetry, the scheme preserves both energy and he- licity identities numerically. This is achieved by recasting singularity for axisymmetric flows. The exact conservation of energy and helicity has effectively eliminated

  5. MATH 632: ALGEBRAIC GEOMETRY II: Schemes Assoc. Professor Karen E. Smith

    E-Print Network [OSTI]

    Smith, Karen E.

    MATH 632: ALGEBRAIC GEOMETRY II: Schemes Assoc. Professor Karen E. Smith Algebraic geometry is one prerequisites for Math 632 are the alpha series in algebra and in topol­ ogy/geometry. Knowledge of the basic ideas from Math 631 is also necessary. Scheme theory is founded on commutative algebra, so familiarity

  6. Arctic Region Evaluation of the Hydro-Thermodynamic Soil Vegetation Scheme (HTSVS)

    E-Print Network [OSTI]

    Moelders, Nicole

    Arctic Region Evaluation of the Hydro-Thermodynamic Soil Vegetation Scheme (HTSVS) Pamela Spier, University of Alaska, Fairbanks, AK Abstract This paper presents an evaluation of the Hydro. Introduction and Motivation The Hydro-Thermodynamic Soil Vegetation Scheme (HTSVS, Kramm et al. 1996, Mölders

  7. The construction of discretely conservative finite volume schemes that also globally conserve energy or entropy

    E-Print Network [OSTI]

    Stanford University

    The construction of discretely conservative finite volume schemes that also globally conserve conservation law u t + x f(u) = 0 is approximated by the semi-discrete conservative scheme duj dt + 1 x fj+1 2 shown that shock waves can be fully resolved by non-dissipative discretizations of this type with a fine

  8. A PHYSICALLY-BASED SCHEME FOR THE URBAN ENERGY BUDGET IN ATMOSPHERIC MODELS

    E-Print Network [OSTI]

    winds. The two model types presented above are used in urban climatology in order to comprehend townA PHYSICALLY-BASED SCHEME FOR THE URBAN ENERGY BUDGET IN ATMOSPHERIC MODELS VALÉRY MASSON Centre) Abstract. An urban surface scheme for atmospheric mesoscale models is presented. A generaliz- ation

  9. Including Atmospheric Layers in Vegetation and Urban Offline Surface Schemes VALE RY MASSON AND YANN SEITY

    E-Print Network [OSTI]

    is able to model the 2-m temperature accurately, as well as the 10-m wind, without any use of analyticalIncluding Atmospheric Layers in Vegetation and Urban Offline Surface Schemes VALE´ RY MASSON coupling between atmospheric-model levels and surface-scheme levels, the coupling proposed here remains

  10. Personnel Department 8-12-2010 TU/e -Salary savings scheme 2011 (ASN Bank)

    E-Print Network [OSTI]

    Franssen, Michael

    12 Personnel Department 8-12-2010 TU/e - Salary savings scheme 2011 (ASN Bank) Alteration from his/her salary relating to the salary savings scheme. Personal details Family name Initials male Telephone numbers TU/e Home Do you already have an employee savings account with the ASN Bank? yes

  11. The nonlinear characteristic scheme for X-Y geometry transport problems

    SciTech Connect (OSTI)

    Walters, W.F.; Wareing, T.A.; Marr, D.R.

    1995-12-31

    The Nonlinear Characteristic (NC) numerical scheme for solving the discrete ordinates form of the transport equation is derived for X-Y geometry. The NC scheme is based on the analytic solution of the discrete-ordinate transport equation in each mesh cell. The driving source for the transport equation is represented by a three-moment preserving, strictly positive, exponential distribution obtained using information theory methods. The analysis of two test problems demonstrates the superior behavior of the NC scheme as compared to other numerical schemes currently used to solve the transport equation. The NC scheme is found to be strictly positive and accurate on meshes where other methods yield either negative and/or remarkably inaccurate results.

  12. Perona Malik anisotropic diffusion model using Peaceman Rachford scheme on digital radiographic image

    SciTech Connect (OSTI)

    Halim, Suhaila Abd; Razak, Rohayu Abd; Ibrahim, Arsmah; Manurung, Yupiter HP

    2014-06-19

    In image processing, it is important to remove noise without affecting the image structure as well as preserving all the edges. Perona Malik Anisotropic Diffusion (PMAD) is a PDE-based model which is suitable for image denoising and edge detection problems. In this paper, the Peaceman Rachford scheme is applied on PMAD to remove unwanted noise as the scheme is efficient and unconditionally stable. The capability of the scheme to remove noise is evaluated on several digital radiography weld defect images computed using MATLAB R2009a. Experimental results obtained show that the Peaceman Rachford scheme improves the image quality substantially well based on the Peak Signal to Noise Ratio (PSNR). The Peaceman Rachford scheme used in solving the PMAD model successfully removes unwanted noise in digital radiographic image.

  13. Scheme dependence and Transverse Momentum Distribution interpretation of Collins-Soper-Sterman resummation

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

    Prokudin, Alexei; Sun, Peng; Yuan, Feng

    2015-10-01

    Following an earlier derivation by Catani-de Florian-Grazzini (2000) on the scheme dependence in the Collins-Soper- Sterman (CSS) resummation formalism in hard scattering processes, we investigate the scheme dependence of the Transverse Momentum Distributions (TMDs) and their applications. By adopting a universal C-coefficient function associated with the integrated parton distributions, the difference between various TMD schemes can be attributed to a perturbative calculable function depending on the hard momentum scale. We further apply several TMD schemes to the Drell-Yan process of lepton pair production in hadronic collisions, and find that the constrained non-perturbative form factors in different schemes are remarkably consistentmore »with each other and with that of the standard CSS formalism.« less

  14. BCS theory of superconductivity: the world's largest Madoff scheme?

    E-Print Network [OSTI]

    J. E. Hirsch

    2009-01-26

    The time-tested BCS theory of superconductivity is generally accepted to be the correct theory of conventional superconductivity by physicists and, by extension, by the world at large. In a different realm of human activity, until very recently Bernard Madoff's time-tested investment operation was generally accepted as true and legitimate in the financial world. Madoff's Ponzi scheme, where old investors were being paid off by funds contributed by new investors, was fundamentally flawed, yet was able to thrive for decades because of many vested interests. `Red flags' suggesting its illegitimacy were ignored. Here I suggest that the same is true of BCS theory. There are an increasing number of `red flags' that strongly suggest the possibility that BCS theory may be fundamentally flawed. For example, an ever-growing number of superconductors are being classified as `unconventional', not described by the conventional BCS theory and each requiring a different physical mechanism. In addition, I argue that BCS theory is unable to explain the Meissner effect, $the$ most fundamental property of superconductors. There are several other phenomena in superconductors for which BCS theory provides no explanation, and BCS theory has proven unable to predict any new superconducting compounds. From one day to the next, Madoff's edifice came crashing down and a staggering 50 billion dollars evaporated, and I suggest that this may also be the fate of BCS theory. I outline an alternative theory to conventional BCS theory proposed to apply to all superconductors, `conventional' as well as `unconventional', that offers an explanation for the Meissner effect as well as for other puzzles and provides clear guidelines in the search for new high temperature superconductors.

  15. An exact general remeshing scheme applied to physically conservative voxelization

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

    Powell, Devon; Abel, Tom

    2015-05-21

    We present an exact general remeshing scheme to compute analytic integrals of polynomial functions over the intersections between convex polyhedral cells of old and new meshes. In physics applications this allows one to ensure global mass, momentum, and energy conservation while applying higher-order polynomial interpolation. We elaborate on applications of our algorithm arising in the analysis of cosmological N-body data, computer graphics, and continuum mechanics problems. We focus on the particular case of remeshing tetrahedral cells onto a Cartesian grid such that the volume integral of the polynomial density function given on the input mesh is guaranteed to equal themore »corresponding integral over the output mesh. We refer to this as “physically conservative voxelization.” At the core of our method is an algorithm for intersecting two convex polyhedra by successively clipping one against the faces of the other. This algorithm is an implementation of the ideas presented abstractly by Sugihara [48], who suggests using the planar graph representations of convex polyhedra to ensure topological consistency of the output. This makes our implementation robust to geometric degeneracy in the input. We employ a simplicial decomposition to calculate moment integrals up to quadratic order over the resulting intersection domain. We also address practical issues arising in a software implementation, including numerical stability in geometric calculations, management of cancellation errors, and extension to two dimensions. In a comparison to recent work, we show substantial performance gains. We provide a C implementation intended to be a fast, accurate, and robust tool for geometric calculations on polyhedral mesh elements.« less

  16. A new generation of satellite based solar irradiance calculation schemes R. W. Mueller, D. Heinemann, C. Hoyer & R. Kuhlemann

    E-Print Network [OSTI]

    Heinemann, Detlev

    A new generation of satellite based solar irradiance calculation schemes R. W. Mueller, D. Piernavieja Instituto Tecnologico de Canarias, Spain Keywords: radiative transfer, solar irradiance, MSG irradiance calculation scheme, including the functional treatment of the diurnal variation of the solar

  17. Evaluation and Interconversion of Various Indicator PCB Schemes for PCB and Dioxin-Like PCB Toxic Equivalent Levels in Fish

    E-Print Network [OSTI]

    Arhonditsis, George B.

    Evaluation and Interconversion of Various Indicator PCB Schemes for PCB and Dioxin-Like PCB ToxicPCB schemes in estimating total of PCB congeners (PCB) and dioxin-like PCB toxic equivalent (dl

  18. Performance Comparison of Unicast Routing Schemes in DTNs Mooi Choo Chuah, Peng Yang, Brian D. Davison, Liang Cheng

    E-Print Network [OSTI]

    Davison, Brian D.

    schemes are optimized to perform well in certain mobility scenarios and thus a hybrid scheme will work/disruption-tolerant networking and communications has been published (e.g., [13],[14],[15],[27]). DieselNet [14

  19. Window Transmission Monitoring and Cleaning Schemes used with the LIDAR Thomson Scattering Diagnostic on the JET Tokamak

    E-Print Network [OSTI]

    Window Transmission Monitoring and Cleaning Schemes used with the LIDAR Thomson Scattering Diagnostic on the JET Tokamak

  20. The impact of the European Union Emissions Trading Scheme on US aviation Robert Malina a,c

    E-Print Network [OSTI]

    The impact of the European Union Emissions Trading Scheme on US aviation Robert Malina a, Germany Keywords: European air transport policy Carbon emissions trading US airline industry a b s t r a c in the European Union Emissions Trading Scheme from 2012 to 2020. We find that the Scheme would only have a small

  1. A Family of Fourth Order Difference Schemes on Rotated Grid for Two Dimensional ConvectionDiffusion Equation \\Lambda

    E-Print Network [OSTI]

    Zhang, Jun

    A Family of Fourth Order Difference Schemes on Rotated Grid for Two Dimensional Convection a family of fourth order finite difference schemes on the rotated grid for the two dimensional convection values of the convection coefficients. We also compare the fourth order schemes with the nine point

  2. A Fourth Order Compact Difference Scheme on Face Centered Cubic Grids with Multigrid Method for Solving 2D

    E-Print Network [OSTI]

    Zhang, Jun

    A Fourth Order Compact Difference Scheme on Face Centered Cubic Grids with Multigrid Method, 2002 Abstract We present a fourth order compact finite difference scheme on the face centered cu­ bic the fourth order convergence rate of the derived discretization scheme and to show that the fourth order

  3. Salary savings scheme 2011 (ING BANK) 11-10-2010 Personnel and Organization Department 1/1

    E-Print Network [OSTI]

    Franssen, Michael

    Salary savings scheme 2011 (ING BANK) 11-10-2010 Personnel and Organization Department 1!! The undersigned hereby declares not to participate in a "course-of-life" arrangement or a salary savings scheme-year and you can only participate in a salary savings scheme via one employer Alteration as of (enter date

  4. Cap and trade schemes on waste management: A case study of the Landfill Allowance Trading Scheme (LATS) in England

    SciTech Connect (OSTI)

    Calaf-Forn, Maria; Roca, Jordi; Puig-Ventosa, Ignasi

    2014-05-01

    Highlights: • LATS has been effective to achieve a reduction of the amount of landfilled waste. • LATS has been one of the few environmental instruments for waste management with a cap and trade methodology. • LATS has achieved to increase recycling of the biodegradable and other waste fractions. - Abstract: The Landfill Allowance Trading Scheme (LATS) is one of the main instruments used in England to enforce the landfill diversion targets established in the Directive 1999/31/EC of the European Parliament and of the Council of 26 April 1999 on the landfill of waste (Landfill Directive). Through the LATS, biodegradable municipal waste (BMW) allowances for landfilling are allocated to each local authority, otherwise known as waste disposal authorities (WDAs). The quantity of landfill allowances received is expected to decrease continuously from 2005/06 to 2019/20 so as to meet the objectives of the Landfill Directive. To achieve their commitments, WDAs can exchange, buy, sell or transfer allowances among each other, or may re-profile their own allocation through banking and/or borrowing. Despite the goals for the first seven years – which included two target years (2005/06 and 2009/10) – being widely achieved (the average allocation of allowances per WDA was 22.9% higher than those finally used), market activity among WDAs was high and prices were not very stable. Results in terms of waste reduction and recycling levels have been satisfactory. The reduction of BMW landfilled (in percentage) was higher during the first seven years of the LATS period (2005/06–2011/12) (around 7% annually) than during the previous period (2001/02–2004/05) (4.2% annually). Since 2008, the significance of the LATS diminished because of an increase in the rate of the UK Landfill Tax. The LATS was suppressed after the 2012/13 target year, before what it was initially scheduled. The purpose of this paper is to describe the particularities of the LATS, analyse its performance as a waste management policy, make a comparison with the Landfill Tax, discuss its main features as regards efficiency, effectiveness and the application of the “polluter pays” principle and finally discuss if the effect of the increase in the Landfill Tax is what made the LATS ultimately unnecessary.

  5. High fidelity readout scheme for rare-earth solid state quantum computing

    E-Print Network [OSTI]

    A. Walther; L. Rippe; Y. Yan; J. Karlsson; D. Serrano; A. N. Nilsson; S. Bengtsson; S. Kröll

    2015-03-29

    We propose and analyze a high fidelity readout scheme for a single instance approach to quantum computing in rare-earth-ion-doped crystals. The scheme is based on using different species of qubit and readout ions, and it is shown that by allowing the closest qubit ion to act as a readout buffer, the readout error can be reduced by more than an order of magnitude. The scheme is shown to be robust against certain experimental variations, such as varying detection efficiencies, and we use the scheme to predict the expected quantum fidelity of a CNOT gate in these solid state systems. In addition, we discuss the potential scalability of the protocol to larger qubit systems. The results are based on parameters which we believed are experimentally feasible with current technology, and which can be simultaneously realized.

  6. Validation of an in-flight flow visualization scheme to quantitatively measure vortical flow phenomena 

    E-Print Network [OSTI]

    Dorsett, Kenneth Merle

    1993-01-01

    A flow visualization measurement scheme was validated in flight. Strake vortex trajectories and axial core velocities were determined using pulsed smoke and high speed video. A gothic strake, operated at an angle of attack of 220 and a Reynolds...

  7. The EU’s Emissions Trading Scheme: A Proto-Type Global System?

    E-Print Network [OSTI]

    Ellerman, A. Denny

    2008-01-01

    The European Union's Emission Trading Scheme (EU ETS) is the world's first multinational cap-and-trade system for greenhouse gases. As an agreement between sovereign nations with diverse historical, institutional, and ...

  8. The EU’s Emissions Trading Scheme: A Prototype Global System?

    E-Print Network [OSTI]

    Ellerman, A. Denny

    The European Union's Emission Trading Scheme (EU ETS) is the world's first multinational cap-and-trade system for greenhouse gases. As an agreement between sovereign nations with diverse historical, institutional, and ...

  9. Allocation and competitiveness in the EU emissions trading scheme: policy overview

    E-Print Network [OSTI]

    Grubb, Michael; Neuhoff, Karsten

    The European emissions trading scheme (EU ETS) has an efficient and effective market design that risks being undermined by three interrelated problems: the approach to allocation; the absence of a credible commitment to post-2012 continuation...

  10. A better way to grow? : land readjustment through town planning schemes in Ahmedabad

    E-Print Network [OSTI]

    Deuskar, Chandan

    2011-01-01

    The Town Planning Scheme mechanism for the expansion of the city of Ahmedabad, India, has attracted widespread interest in recent years. It is seen as a participatory and equitable means of acquiring land from rural ...

  11. Efficient authentication scheme for data aggregation in smart grid with fault tolerance and fault diagnosis

    E-Print Network [OSTI]

    Li, Depeng

    Authentication schemes relying on per-packet signature and per-signature verification introduce heavy cost for computation and communication. Due to its constraint resources, smart grid's authentication requirement cannot ...

  12. Fully Distributed Proxy Signature Schemes Javier Herranz and Germ an S aez

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    and Stern proved in [11]). This distributed scheme is based on the joint generation of a random secret value, logistical) problem. In a more concrete (or practical) situation, we can imagine a company with many depart

  13. A Control Scheme of Enhanced Reliability for Multiple Chiller Plants Using Mergerd Building Cooling Load Measurements 

    E-Print Network [OSTI]

    Wang, S.; Sun, Y.; Huang, G.; Zhu, N.

    2008-01-01

    the cooling load using chiller models based on the instantaneous chiller electrical power input and condition measured variables. The control performance of the proposed scheme is validated in this paper....

  14. Control Scheme Modifications Increase Efficiency of Steam Generation System at Exxon Mobil Gas Plant

    SciTech Connect (OSTI)

    2002-01-01

    This case study highlights control scheme modifications made to the steam system at ExxonMobil's Mary Ann Gas Plant in Mobile, Alabama, which improved steam flow efficiency and reduced energy costs.

  15. The Influence of a CO2 Pricing Scheme on Distributed Energy Resources in California's Commercial Buildings

    E-Print Network [OSTI]

    Stadler, Michael

    2010-01-01

    to all DER technologies, PV adoption increases, but only in2 Pricing Scheme on CHP/PV adoption and CO 2 emissions SinceCO 2 price, PV and solar thermal adoption increases in all

  16. A Feedback-based Adaptive Broadcast Coding Scheme for Reducing In-order Delivery Delay

    E-Print Network [OSTI]

    Medard, Muriel

    We propose a new feedback-based adaptive coding scheme for a packet erasure broadcast channel. The main performance metric of interest is the delay. We consider two types of delay - decoding delay and delivery delay. ...

  17. A Dual-Phase Power Allocation Scheme for Multicarrier Relay Systems With Direct Link

    E-Print Network [OSTI]

    Hua, Yingbo; Ma, Yiming; Liu, An

    2013-01-01

    POWER ALLOCATION SCHEME where is the inverse function of ,allocation algorithm to minimize a general cost function forallocation problem is for- mulated as: where Neither nor is a convex functions

  18. GreenVis: Energy-Saving Color Schemes for Sequential Data Visualization on OLED Displays

    E-Print Network [OSTI]

    North Virginia Tech Blacksburg, VA north@cs.vt.edu ABSTRACT The organic light emitting diode (OLED, Color Scheme, Visualization 1. INTRODUCTION The organic light-emitting diode (OLED) display is an emerg

  19. A new landscape ecology mapping scheme for coastal environments: Galveston Island, Texas 

    E-Print Network [OSTI]

    Lynch, Karen Marie

    1996-01-01

    of landscape ecology to understand the complete picture of the changing environment of a barrier island. Mapping is fundamental to detecting and monitoring change. Currently no mapping scheme can effectively integrate geomorphological and ecological mapping...

  20. Cotton Production under Traditional and Regulated Deficit Irrigation Schemes in Southwest Texas 

    E-Print Network [OSTI]

    Wen, Yujin

    2012-10-19

    application (LEPA) sprinkler irrigation system. The 70 percent evapotranspiration (ET)-initialled regulated deficit irrigation scheme (70R) performed well in maintaining lint yield in most cotton varieties tested. The significant changes detected in lint...

  1. Entity Authentication Schemes Using Braid Word Reduction Herve SIBERT, Patrick DEHORNOY, and Marc GIRAULT

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Entity Authentication Schemes Using Braid Word Reduction Hervâ??e SIBERT, Patrick DEHORNOY, and Marc, authentication, zero knowledge, handle reduction. 1 #12; 2 HERV â?? E SIBERT, PATRICK DEHORNOY, AND MARC GIRAULT 2

  2. Entity Authentication Schemes Using Braid Word Reduction Herve SIBERT, Patrick DEHORNOY, and Marc GIRAULT

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Entity Authentication Schemes Using Braid Word Reduction Herv´e SIBERT, Patrick DEHORNOY, and Marc, AND MARC GIRAULT 2. Difficult braid problems 2.1. Braid groups. For n 2, Artin's braid group Bn is defined

  3. Economic impact of the European Union Emission Trading Scheme : evidence from the refining sector

    E-Print Network [OSTI]

    Lacombe, Romain H

    2008-01-01

    I study the economic impact of the European Union Emission Trading Scheme (EU ETS) on the refining industry in Europe. I contrast previous ex-ante studies with the lessons from a series of interviews I conducted with ...

  4. Gradient Projection Anti-windup Scheme on Constrained Planar LTI Systems

    E-Print Network [OSTI]

    Teo, Justin

    2010-03-15

    The gradient projection anti-windup (GPAW) scheme was recently proposed as an anti-windup method for nonlinear multi-input-multi-output systems/controllers, the solution of which was recognized as a largely open problem ...

  5. A cascaded laser acceleration scheme for the generation of spectrally controlled proton beams

    E-Print Network [OSTI]

    Pfotenhauer, Sebastian Michael

    We present a novel, cascaded acceleration scheme for the generation of spectrally controlled ion beams using a laser-based accelerator in a 'double-stage' setup. An MeV proton beam produced during a relativistic laser–plasma ...

  6. Risk Assessment Scheme of Infection Transmission Indoors Incorporating the Impact of Resuspension

    E-Print Network [OSTI]

    You, Siming; Wan, Man Pun

    2015-01-01

    tive microbial risk assessment. Risk Analysis, 2009; 29(3):2003; 37(39):5597– A Risk Assessment Scheme of InfectionCP. Quantitative Microbial Risk Assessment. New York: John

  7. AN OPTIMIZED HANDOFF SCHEME FOR IP MOBILITY SUPPORT IN IEEE 802.11

    E-Print Network [OSTI]

    the problem. A very interesting work on the subject is the handoff scheme presented in [4] (Daedalus project-layer triggers for a forecasted handoff. A very interesting approach is presented in [11] (MosquitoNet project

  8. On security of a Certificateless Aggregate Signature Scheme Limin Shen, Yinxia Sun

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    On security of a Certificateless Aggregate Signature Scheme Limin Shen, Yinxia Sun Jiangsu messages. The advantages #12;2 Limin Shen, Yinxia Sun of CL-PKC, such as escrow-free and certificate

  9. Block Time Step Storage Scheme for Astrophysical N-body Simulations

    E-Print Network [OSTI]

    Cai, Maxwell Xu; Kouwenhoven, M B N; Assmann, Paulina; Spurzem, Rainer

    2015-01-01

    Astrophysical research in recent decades has made significant progress thanks to the availability of various $N$-body simulation techniques. With the rapid development of high-performance computing technologies, modern simulations have been able to take the computing power of massively parallel clusters with more than $10^5$ GPU cores. While unprecedented accuracy and dynamical scales have been achieved, the enormous amount of data being generated continuously poses great challenges for the subsequent procedures of data analysis and archiving. As an urgent response to these challenges, in this paper we propose an adaptive storage scheme for simulation data, inspired by the block time step integration scheme found in a number of direct $N$-body integrators available nowadays. The proposed scheme, namely the block time step storage scheme, works by minimizing the data redundancy with assignments of data with individual output frequencies as required by the researcher. As demonstrated by benchmarks, the proposed...

  10. Quantum-coupled single-electron thermal to electric conversion scheme

    E-Print Network [OSTI]

    Wu, Dennis M. (Dennis Meng-Jiao)

    2008-01-01

    A new thermal to electric conversion scheme based on an excitation transfer and tunneling mechanism is studied theoretically. Coulomb coupling dominates when the hot side and the cold side are very close. Two important ...

  11. NUMERICAL ANALYSIS OF A FINITE ELEMENT SCHEME FOR THE APPROXIMATION OF HARMONIC MAPS INTO SURFACES

    E-Print Network [OSTI]

    Bartels, Soeren

    NUMERICAL ANALYSIS OF A FINITE ELEMENT SCHEME FOR THE APPROXIMATION OF HARMONIC MAPS INTO SURFACES Geometric partial differential equations and their analysis as well as numerical simulation have recently

  12. A New Scheme for Stigmatic X-ray Imaging with Large Magnification...

    Office of Scientific and Technical Information (OSTI)

    F; Beiersdorfer, P; Wang, E; Sanchez del Rio, M; Caughey, T A 70 PLASMA PHYSICS AND FUSION TECHNOLOGY X-ray Imaging X-ray Imaging This paper describes a new x-ray scheme for...

  13. The multiple-point schemes of a finite curvilinear map of ...

    E-Print Network [OSTI]

    1910-30-30

    ?1. Nr. In this setting—in fact, in a more general setting—we prove the following statements, which show that Mr and Nr behave like reasonable schemes of ...

  14. The Green Building Scheme for a Sustainable Eco-City in Taipei 

    E-Print Network [OSTI]

    Sun, S.; Chen, Z.; Clements-Croome, D.

    2006-01-01

    Taipei City has put a significant effort toward the implementation of green design and green building schemes towards a sustainable eco-city. Although some of the environmental indicators have not indicated significant progress in environmental...

  15. A high carrier injection terahertz quantum cascade laser based on indirectly pumped scheme

    E-Print Network [OSTI]

    Razavipour, S. G.

    A Terahertz quantum cascade laser with a rather high injection coupling strength based on an indirectly pumped scheme is designed and experimentally implemented. To effectively suppress leakage current, the chosen quantum ...

  16. Evaluation of the environmental viability of direct injection schemes for ocean carbon sequestration

    E-Print Network [OSTI]

    Israelsson, Peter H. (Peter Hampus), 1973-

    2008-01-01

    This thesis evaluates the expected impact of several promising schemes for ocean carbon sequestration by direct injection of CO2, and serves as an update to the assessment by Auerbach et al. (1997) and Caulfield et al. ...

  17. Congestion control schemes for single and parallel TCP flows in high bandwidth-delay product networks 

    E-Print Network [OSTI]

    Cho, Soohyun

    2006-08-16

    In this work, we focus on congestion control mechanisms in Transmission Control Protocol (TCP) for emerging very-high bandwidth-delay product networks and suggest several congestion control schemes for parallel and single-flow ...

  18. A cost-benefit approach to youth vocational training schemes in Africa 

    E-Print Network [OSTI]

    Kuanyin, Emmanuel Bol

    1974-01-01

    A COST-BENEFIT APPROACH TO YOUTH VOCATIONAL TRAINING SCHEMES IN AFRICA A Thesis By EMMANUEL BOL KUANY IN Submitted to the Graduate College of Texas ASM University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE... Oecember 1974 Major Subject: Economic s A COST-BENEFIT APPROACH TO YOUTH VOCATIONAL TRAINING SCHEMES IN AFRICA A Thesis EMMANUEL BOL KUANYIN As Approved to Style and Content by: (Chairman of Committee) (Head of Department) (Member ~ ~ (Member...

  19. Efficient quantum key distribution scheme with pre-announcing the basis

    E-Print Network [OSTI]

    Jingliang Gao; Changhua Zhu; Heling Xiao

    2014-10-21

    We devise a new quantum key distribution scheme that is more efficient than the BB84 protocol. By pre-announcing basis, Alice and Bob are more likely to use the same basis to prepare and measure the qubits, thus achieves a higher efficiency. The error analysis is revised and its security against any eavesdropping is proven briefly. Furthermore we show that, compared with the LCA scheme, our modification can be applied in more quantum channels.

  20. Simulation of fluid and particles flows: Asymptotic preserving schemes for bubbling and flowing regimes

    SciTech Connect (OSTI)

    Carrillo, Jose-Antonio Goudon, Thierry Lafitte, Pauline

    2008-08-10

    In this work, we propose asymptotic preserving numerical schemes for the bubbling and flowing regimes of particles immersed in a fluid treated by two-phase flow models. The description comprises compressible Euler equations for the dense phase (fluid) and a kinetic Fokker-Planck equation for the disperse phase (particles) coupled through friction terms. We show numerical simulations in the relevant case of gravity in the one-dimensional case demonstrating the overall behavior of the schemes.

  1. Info sheet : Social and ethical standards and product labelling schemes Credible and accessible voluntary standards and certification schemes can be effective

    E-Print Network [OSTI]

    and environmental changes to the societies and communities in which they operate. It is important that procurement their systems and approaches. These standards are often sector specific, for example Global e- Sustainability of independence of the schemes governance. Are the organisations and personal responsible for overseeing

  2. A new chemical scheme to study carbon-rich exoplanet atmospheres

    E-Print Network [OSTI]

    Venot, Olivia; Agúndez, Marcelino; Decin, Leen; Bounaceur, Roda

    2015-01-01

    Atmospheres with a high C/O ratio are expected to contain an important quantity of hydrocarbons, including heavy molecules (with more than 2 carbon atoms). To study correctly these C-rich atmospheres, a chemical scheme adapted to this composition is necessary. We have implemented a chemical scheme that can describe the kinetics of species with up to 6 carbon atoms. This chemical scheme has been developed with specialists of combustion and validated through experiments on a wide range of T and P. This chemical network is available on the online database KIDA. We have created a grid of 12 models to explore different thermal profiles and C/O ratios. For each of them, we have compared the chemical composition determined with a C0-C2 chemical scheme (species with up to 2 carbon atoms) and with the C0-C6 scheme. We found no difference in the results obtained with the two schemes when photolyses are not included in the model, whatever the temperature of the atmosphere. In contrast, when there is photochemistry, diff...

  3. Stochastic Analysis of a Churn-Tolerant Structured Peer-to-Peer Scheme

    E-Print Network [OSTI]

    Jacobs, Tim

    2010-01-01

    We present and analyze a simple and general scheme to build a churn (fault)-tolerant structured Peer-to-Peer (P2P) network. Our scheme shows how to ``convert" a static network into a dynamic distributed hash table(DHT)-based P2P network such that all the good properties of the static network are guaranteed with high probability (w.h.p). Applying our scheme to a cube-connected cycles network, for example, yields a $O(\\log N)$ degree connected network, in which every search succeeds in $O(\\log N)$ hops w.h.p., using $O(\\log N)$ messages, where $N$ is the expected stable network size. Our scheme has an constant storage overhead (the number of nodes responsible for servicing a data item) and an $O(\\log N)$ overhead (messages and time) per insertion and essentially no overhead for deletions. All these bounds are essentially optimal. While DHT schemes with similar guarantees are already known in the literature, this work is new in the following aspects: (1) It presents a rigorous mathematical analysis of the scheme...

  4. Study of energy tax and rebate schemes: energy conservation and the question of equity

    SciTech Connect (OSTI)

    Fazel Sarjui, F.

    1983-01-01

    Taxing all kinds of primary energy at the wellhead on a $/Btu basis is suggested. This aims at inducing energy conservation throughout the economic system. To reduce the financial pressure of the tax on consumers, especially the poor, tax revenues could be rebated to households. It has been attempted to design an equitable rebate scheme. A mathematical model was developed that approximates the reduction in a household's total energy consumption in response to higher energy prices and different rebate schemes. This model is based on the assumption that energy consumption is a function of a household's real income, prices of different commodities, and energy intensities. The amount of energy saved and the change in real expenditure of a household was calculated for four tax rates; 50%, 100%, 224% and 400%, and five rebate schemes; one regressive, two progressive, one income distribution preserving and the flat per-capita rebate. The results indicate that, for a given tax rate, the choice of rebate scheme does not significantly affect the amount of energy conserved by the households. However, the effectof different rebate schemes on a household's real expenditure could be dramatically different.

  5. X-ray tests of a two-dimensional stigmatic imaging scheme with variable magnifications

    SciTech Connect (OSTI)

    Lu, J.; Bitter, M.; Hill, K. W.; Delgado-Aparicio, L. F.; Efthimion, P. C.; Pablant, N. A.; Beiersdorfer, P.; Caughey, T. A.; Brunner, J.

    2014-11-15

    A two-dimensional stigmatic x-ray imaging scheme, consisting of two spherically bent crystals, one concave and one convex, was recently proposed [M. Bitter et al., Rev. Sci. Instrum. 83, 10E527 (2012)]. The Bragg angles and the radii of curvature of the two crystals of this imaging scheme are matched to eliminate the astigmatism and to satisfy the Bragg condition across both crystal surfaces for a given x-ray energy. In this paper, we consider more general configurations of this imaging scheme, which allow us to vary the magnification for a given pair of crystals and x-ray energy. The stigmatic imaging scheme has been validated for the first time by imaging x-rays generated by a micro-focus x-ray source with source size of 8.4 ?m validated by knife-edge measurements. Results are presented from imaging the tungsten L?1 emission at 8.3976 keV, using a convex Si-422 crystal and a concave Si-533 crystal with 2d-spacings of 2.21707 Å and 1.65635 Å and radii of curvature of 500 ± 1 mm and 823 ± 1 mm, respectively, showing a spatial resolution of 54.9 ?m. This imaging scheme is expected to be of interest for the two-dimensional imaging of laser produced plasmas.

  6. Passive-scheme analysis for solving untrusted source problem in quantum key distribution

    E-Print Network [OSTI]

    Xiang Peng; Bingjie Xu; Hong Guo

    2010-04-28

    As a practical method, the passive scheme is useful to monitor the photon statistics of an untrusted source in a "Plug & Play" quantum key distribution (QKD) system. In a passive scheme, three kinds of monitor mode can be adopted: average photon number (APN) monitor, photon number analyzer (PNA) and photon number distribution (PND) monitor. In this paper, the security analysis is rigorously given for APN monitor, while for PNA, the analysis including statistical fluctuation and random noise, is addressed with a confidence level. The results show that the PNA can achieve better performance than the APN monitor and can asymptotically approach the theoretical limit of the PND monitor. Also, the passive scheme with the PNA works efficiently when the signal-to-noise ratio ($R^{SN}$) is not too low and so is highly applicable to solve the untrusted source problem in the QKD system.

  7. A stochastic multi-symplectic scheme for stochastic Maxwell equations with additive noise

    SciTech Connect (OSTI)

    Hong, Jialin; Zhang, Liying

    2014-07-01

    In this paper we investigate a stochastic multi-symplectic method for stochastic Maxwell equations with additive noise. Based on the stochastic version of variational principle, we find a way to obtain the stochastic multi-symplectic structure of three-dimensional (3-D) stochastic Maxwell equations with additive noise. We propose a stochastic multi-symplectic scheme and show that it preserves the stochastic multi-symplectic conservation law and the local and global stochastic energy dissipative properties, which the equations themselves possess. Numerical experiments are performed to verify the numerical behaviors of the stochastic multi-symplectic scheme.

  8. 2D numerical simulation of the MEP energy-transport model with a finite difference scheme

    SciTech Connect (OSTI)

    Romano, V. . E-mail: romano@dmi.unict.it

    2007-02-10

    A finite difference scheme of Scharfetter-Gummel type is used to simulate a consistent energy-transport model for electron transport in semiconductors devices, free of any fitting parameters, formulated on the basis of the maximum entropy principle. Simulations of silicon n{sup +}-n-n{sup +} diodes, 2D-MESFET and 2D-MOSFET and comparisons with the results obtained by a direct simulation of the Boltzmann transport equation and with other energy-transport models, known in the literature, show the validity of the model and the robustness of the numerical scheme.

  9. Security analysis of boolean algebra based on Zhang-Wang digital signature scheme

    SciTech Connect (OSTI)

    Zheng, Jinbin

    2014-10-06

    In 2005, Zhang and Wang proposed an improvement signature scheme without using one-way hash function and message redundancy. In this paper, we show that this scheme exits potential safety concerns through the analysis of boolean algebra, such as bitwise exclusive-or, and point out that mapping is not one to one between assembly instructions and machine code actually by means of the analysis of the result of the assembly program segment, and which possibly causes safety problems unknown to the software.

  10. A Versatile Scheme for the Validation, Testing and Debugging of High Speed Serial Interfaces

    E-Print Network [OSTI]

    Zilic, Zeljko

    A Versatile Scheme for the Validation, Testing and Debugging of High Speed Serial Interfaces, the post-silicon validation, debugging and testing of HSSIs are becoming critical. This paper presents and an FPGA-based Bit Error Rate Tester (BERT), we can validate and test HSSIs without the need of high

  11. A Lightweight Encryption Scheme for Network-Coded Mobile Ad Hoc Networks

    E-Print Network [OSTI]

    Shen, Xuemin "Sherman"

    schemes. Index Terms--Mobile ad hoc networks, energy saving, network coding, lightweight encryption. ! 1 a lower energy consumption in MANETs [6]­[8]. The energy saving comes from fact that less transmissions operations, this means 1/4 energy can be saved. Besides basic transmissions, energy consumption can also come

  12. Rcast: A Randomized Communication Scheme for Improving Energy Efficiency in MANETs

    E-Print Network [OSTI]

    Lim, Sunho

    )-based algorithms [5, 10, 14, 16] are examples of the first category. However, more energy saving can be ob- tainedRcast: A Randomized Communication Scheme for Improving Energy Efficiency in MANETs Sunho Lim Chansu Yu Chita R. Das Dept. of Computer Science and Engineering Dept. of Electrical and Computer

  13. Lessons learnt from post EIS evaluations of national road schemes in Ireland

    SciTech Connect (OSTI)

    King, E.A.; O'Malley, V.P.

    2012-01-15

    The Irish National Roads Authority (NRA) recently completed over twenty post environmental impact assessment evaluations of noise chapters prepared as part of Environmental Impact Statements (EISs) for new national road schemes in Ireland. The study focused on a range of issues including a review of noise monitoring procedures, noise prediction methodologies and an assessment of the effectiveness of noise mitigation measures currently in use on national road schemes. This review was carried out taking cognisance of best international practices for noise assessment and methodologies used to mitigate road traffic noise. The primary focus of the study was to assess the actual noise impacts of national road scheme developments and to revise, where necessary, methodologies recommended in the current NRA guidance document describing the treatment of noise on national road schemes. This paper presents a summary of the study and identifies a number of key areas that should be considered prior to the development of future guidance documents. - Highlights: Black-Right-Pointing-Pointer Presents a post-EIS evaluation of noise assessments for national roads in Ireland. Black-Right-Pointing-Pointer The effectiveness of some noise mitigation measures is critically evaluated. Black-Right-Pointing-Pointer Issues related to the current EIS noise assessment methodologies are discussed. Black-Right-Pointing-Pointer Implications for alterations to the NRA noise guidelines.

  14. Hidden Pair of Bijection Signature Scheme Masahito Gotaishi and Shigeo Tsujii

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Key Cryptosystem, Digital Signature, Bijection, Rainbow 1 Introduction 1.1 Multivariate Public Key of variants, with about 30 to 40 schemes proposed in the past. Although, according to the classification. Multivariate Public Key Cryptosystem 1.3 MPKC Trapdoors According to the classification of Wolf [24], the basic

  15. Adequate Numerical Solution of Air Pollution Problems by positive Difference Schemes on

    E-Print Network [OSTI]

    Ehrhardt, Matthias

    Adequate Numerical Solution of Air Pollution Problems by positive Difference Schemes on unbounded In this work we deal with the numerical solution of some problems of air pollution. Since the problems) pollution. The efficiency and accuracy of our method is illustrated by an example. Key words: air pollution

  16. Adequate Numerical Solution of Air Pollution Problems by positive Di#erence Schemes on

    E-Print Network [OSTI]

    Ehrhardt, Matthias

    Adequate Numerical Solution of Air Pollution Problems by positive Di#erence Schemes on unbounded In this work we deal with the numerical solution of some problems of air pollution. Since the problems) pollution. The e#ciency and accuracy of our method is illustrated by an example. Key words: air pollution

  17. A Control Strategy Scheme for Fuel Cell-Vehicle Based on Frequency Hamza Alloui

    E-Print Network [OSTI]

    Boyer, Edmond

    A Control Strategy Scheme for Fuel Cell-Vehicle Based on Frequency Separation Hamza Alloui based on frequency-separation for Fuel cell-Battery Hybrid Electric Vehicle (HEV), using a Fuel cell (FC of this strategy. Keywords ­ Fuel cell, hybrid source, battery, DC-DC Boost converter, Buck-boost converter

  18. Spatial model coupling -an efficient scheme to combine hydraulic and geomechanic simulations

    E-Print Network [OSTI]

    Cirpka, Olaf Arie

    Spatial model coupling - an efficient scheme to combine hydraulic and geomechanic simulations present a spatial coupling approach with two subdomains [1]: Hydro-geomechanical model full model approach-field (geomechanics are neglected) hydro-geomechanical subdomain el2p model hydraulic subdomain 2p model hydraulic

  19. Graph-theoretic design and analysis of key predistribution schemes Michelle Kendall Keith M. Martin

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Graph-theoretic design and analysis of key predistribution schemes Michelle Kendall Keith M. Martin, a general understanding of the design prin- ciples on which to base such constructions is somewhat lacking as a sound design principle. Second, we propose the use of incidence graphs and concurrence graphs as tools

  20. Address Assignment and Routing Schemes for ZigBee-Based Long-Thin Wireless Sensor Networks

    E-Print Network [OSTI]

    Tseng, Yu-Chee

    that the address assignment and thus the tree routing scheme defined in the original ZigBee specification may work Terms--address assignment, long-thin network, routing protocol, wireless sensor network, ZigBee. I [5]. For interoperability among different systems, standards such as ZigBee [17] have been developed

  1. A Lightweight Network Repair Scheme for Data Collection Applications in ZigBee WSNs

    E-Print Network [OSTI]

    Tseng, Yu-Chee

    1 A Lightweight Network Repair Scheme for Data Collection Applications in ZigBee WSNs Meng networks (WSNs). In [4], a quick convergecast solution is proposed for data collection in a ZigBee beacon-enabled tree- based WSN. However, it does not consider the network repair issue. When a ZigBee router loses its

  2. A Model-Based Impedance Control Scheme for High-Performance Hydraulic Joints

    E-Print Network [OSTI]

    Papadopoulos, Evangelos

    A Model-Based Impedance Control Scheme for High-Performance Hydraulic Joints Glen Bilodeau1, Greece Abstract Impedance control of a hydraulic servoactuator joint system is discussed in this paper individually. Due to nonlinear properties of hydraulic actuators, impedance control is difficult. The control

  3. CPM-SC-IFDMA--A Power Efficient Transmission Scheme for Uplink LTE

    E-Print Network [OSTI]

    Rahman, Raina

    2011-04-07

    In this thesis we have proposed a power efficient transmission scheme, CPM-SC-IFDMA, for uplink LTE. In uplink LTE, efficiency of the transmitter power amplier is a major concern, as the transmitter is placed in the mobile device which has limited...

  4. A FIRST ORDER PROJECTION-BASED TIME-SPLITTING SCHEME FOR COMPUTING CHEMICALLY REACTING FLOWS

    E-Print Network [OSTI]

    A FIRST ORDER PROJECTION-BASED TIME-SPLITTING SCHEME FOR COMPUTING CHEMICALLY REACTING FLOWS, surface catalytic reactors for methane to methanol conversion and chemical vapor deposition (CVD) process ANDREAS PROHL1 Abstract. The simulation of chemically reacting ows in speci#12;c situations is a basic

  5. A FIRST ORDER PROJECTIONBASED TIMESPLITTING SCHEME FOR COMPUTING CHEMICALLY REACTING FLOWS

    E-Print Network [OSTI]

    A FIRST ORDER PROJECTION­BASED TIME­SPLITTING SCHEME FOR COMPUTING CHEMICALLY REACTING FLOWS catalytic reactors for methane to methanol conversion and chemical vapor deposition (CVD) process modeling ANDREAS PROHL 1 Abstract. The simulation of chemically reacting flows in specific situations is a basic

  6. High Order Space-Time Finite Element Schemes for Acoustic and Viscodynamic Wave Equations with

    E-Print Network [OSTI]

    High Order Space-Time Finite Element Schemes for Acoustic and Viscodynamic Wave Equations in time 5 3 Specific applications 10 3.1 The acoustic wave equation, for the first time, to second order wave equations including elastodynamics with and without Kelvin

  7. Formal Proof of a Wave Equation Resolution Scheme: the Method Error

    E-Print Network [OSTI]

    Mayero, Micaela

    -dimensional acoustic wave equation are well-known to be convergent. We present a comprehensive formalization words: partial differential equation, acoustic wave equation, nu- merical scheme, Coq formal proofs 1 propagation models, the acoustic wave equation in a one-dimensional space domain, for it is a prototype model

  8. High Order Space-Time Finite Element Schemes for Acoustic and Viscodynamic Wave Equations with

    E-Print Network [OSTI]

    High Order Space-Time Finite Element Schemes for Acoustic and Viscodynamic Wave Equations applications are to the acoustic wave equation and to elastodynamics. We also build in the well-known Kelvin for decoupled DGFEM in time 6 3 Specific applications 10 3.1 The acoustic wave equation

  9. A ROBUST WELL-BALANCED SCHEME FOR MULTI-LAYER SHALLOW WATER EQUATIONS

    E-Print Network [OSTI]

    the overall property of being conservative in the total momentum. It is based on a source-centered hydro of the layers with respect to horizontal scales, small viscosity, hydrostatics, small slope for the topography-centered hydro- static reconstruction scheme for the one-layer system, a variant of the hydrostatic

  10. An Automatic Hierarchical Image Classification Scheme Jing Huang S Ravi Kumar y Ramin Zabih z

    E-Print Network [OSTI]

    Zabih, Ramin

    in such a process. Image Classification. One approach to this problem is to orga- nize the digital libraryAn Automatic Hierarchical Image Classification Scheme Jing Huang S Ravi Kumar y Ramin Zabih z Department of Computer Science Cornell University Ithaca, NY 14853. Abstract Organizing images into semantic

  11. An Efficient Transparent Test Scheme for Embedded Word-Oriented Memories

    E-Print Network [OSTI]

    Boyer, Edmond

    An Efficient Transparent Test Scheme for Embedded Word-Oriented Memories Jin-Fu Li, Tsu-Wei Tseng, and Chin-Long Wey Advanced Reliable Systems (ARES) Laboratory Department of Electrical Engineering National with the smallest feature size in system-on-chip (SOC) designs. The reliability of memory cores thus has heavy

  12. A Quasi-continuous Interpolation Scheme for Pathways between Distant Configurations

    E-Print Network [OSTI]

    Carr, Joanne M.; Wales, David J.

    2012-08-28

    for Pathways Between Distant Configurations David J. Wales1?and Joanne M. Carr1† University Chemical Laboratories, Lensfield Road, Cambridge CB2 1EW, UK June 11, 2012 ?dw34@cam.ac.uk †jmc49@cam.ac.uk 1 Abstract A quasi-continuous interpolation scheme...

  13. A decision-support scheme for mapping endangered areas in pest risk analysis*

    E-Print Network [OSTI]

    Kratochvíl, Lukas

    A decision-support scheme for mapping endangered areas in pest risk analysis* R. H. A. Baker1, J to the EPPO DSS for pest risk analysis (PRA) (http:// capra.eppo.org/deliverables; http Systems Analysis, Crop & Weed Ecology Group, P.O. Box 430, 6700 AK Wageningen (The Netherlands) 13The Bio

  14. Outage Probability in a Multi-Cellular Network using Alamouti Scheme

    E-Print Network [OSTI]

    Coupechoux, Marceau

    Outage Probability in a Multi-Cellular Network using Alamouti Scheme Dorra Ben Cheikh , Jean to interference plus noise ratio (SINR) or equivalently the outage probability in flat Rayleigh fading. The system power from the interfering base stations. In the first case, a closed- form expression for the outage

  15. High Speed Networks A FAST ARBITRATION SCHEME FOR TERABIT PACKET SWITCHES

    E-Print Network [OSTI]

    Chao, Jonathan

    High Speed Networks A FAST ARBITRATION SCHEME FOR TERABIT PACKET SWITCHES H. Jonathan Chao, Cheuk H Abstract Input-output queued switches have been widely con- sidered as the most feasible solution for large capac- ity packet switches and IP routers. The challenge is to develop a high speed and cost

  16. Guidelines for third party technical inspection of Rural water supply schemes.

    E-Print Network [OSTI]

    Sohoni, Milind

    Guidelines for third party technical inspection of Rural water supply schemes. Government of Maharashtra Water Supply and Sanitation Department Govt. Resolution No.: Gra.Pa.Dho.- 1114 / Case No.61 / Pa: The state of Maharashtra is leading in the field of improvements and decentralisation of rural water supply

  17. Comparison of Price-based Static and Dynamic Job Allocation Schemes for Grid Computing Systems

    E-Print Network [OSTI]

    Chronopoulos, Anthony T.

    Comparison of Price-based Static and Dynamic Job Allocation Schemes for Grid Computing Systems Antonio San Antonio, TX 78249, USA Email: atc@cs.utsa.edu Abstract--Grid computing systems are a cost-effective al- ternative to traditional high-performance computing systems. However, the computing resources

  18. A Hierarchical Classification Scheme to Derive Interprocess Communication in Process Networks

    E-Print Network [OSTI]

    Kienhuis, Bart

    % of the cases, we still relay on integer linear programming while in the remaining 95%, the tests presented, an ILP test has still to be applied. Thus, we introduce a hierarchical classification scheme. In only 5% of the cases to classify, we still relay on integer linear programming while in the remaining

  19. A Cheat-Proof Game Theoretic Demand Response Scheme for Smart Grids

    E-Print Network [OSTI]

    Liu, K. J. Ray

    A Cheat-Proof Game Theoretic Demand Response Scheme for Smart Grids Yan Chen, W. Sabrina Lin, Feng}@umd.edu Abstract--While demand response has achieved promising results on making the power grid more efficient and reliable, the additional dynamics and flexibility brought by demand response also increase the uncertainty

  20. ForPeerReview An Efficient Adaptive Distributed Space-Time Coding Scheme for

    E-Print Network [OSTI]

    Waterloo, University of

    networks is to mitigate the effect of the multipath fading. Exploiting techniques such as time, frequency received signal. The main goal of this paper is to investigate a power allocation strategy in relay-destination link, it is shown that a threshold-based power allocation scheme (i.e., the relay remains silent if its

  1. A Multi-Function Provable Data Possession Scheme in Cloud Computing

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    1 A Multi-Function Provable Data Possession Scheme in Cloud Computing Xiaojun Yu, Qiaoyan Wen State the different requirements of provable data possession in cloud computing, a multi-function provable data; cloud computing; 1 Introduction With the cost and technology advantage, the cloud computing

  2. Bluenet a New Scatternet Formation Scheme Zhifang Wang, Robert J. Thomas, Zygmunt Haas

    E-Print Network [OSTI]

    and facilitate supplier and customer cooperation in an integrated supply-side and demand-side management scheme for data and information flow at low cost. During recent years, there has been a substantial demand seamlessly without wires. This demand has led to a rapid development of the Bluetooth System. In July 1997

  3. Performance of Flocking-Based Control Schemes in Smart Grid Applications

    E-Print Network [OSTI]

    Kundur, Deepa

    Performance of Flocking-Based Control Schemes in Smart Grid Applications Abdallah K. Farraj Eman M@tamu.edu Abstract--Flocking control has recently been used in smart grid applications to stabilize power systems Interest in smart grid systems has surged recently. Smart grid systems use advanced control, communications

  4. Efficient generation of extended plasma waveguides with the axicon ignitor-heater scheme

    E-Print Network [OSTI]

    Cheng University, Chia-Yi 621, Taiwan J. Wang Institute of Atomic and Molecular Sciences, Academia-heater scheme. The short-pulse ignitor generates the seed electrons by multiphoton ionization, and the long by using electrical discharge or doping of lower-ionization-threshold gas to pro- vide seed electrons.5

  5. PMI-based MIMO OFDM PHY Integrated Key Exchange (P-MOPI) Scheme

    E-Print Network [OSTI]

    Lan, Pang-Chang; Lee, Chia-Han; Yeh, Ping-Cheng; Cheng, Chen-Mou

    2011-01-01

    In the literature, J.-P. Cheng et al. have proposed the MIMO-OFDM PHY integrated (MOPI) scheme for achieving physical-layer security in practice without using any cryptographic ciphers. The MOPI scheme uses channel sounding and physical-layer network coding (PNC) to prevent eavesdroppers from learning the channel state information (CSI). Nevertheless, due to the use of multiple antennas for PNC at transmitter and beamforming at receiver, it is not possible to have spatial multiplexing nor use space-time codes in our previous MOPI scheme. In this paper, we propose a variant of the MOPI scheme, called P-MOPI, that works with a cryptographic cipher and utilizes precoding matrix index (PMI) as an efficient key-exchange mechanism. With channel sounding, the PMI is only known between the transmitter and the legal receiver. The shared key can then be used, e.g., as the seed to generate pseudo random bit sequences for securing subsequent transmissions using a stream cipher. By applying the same techniques at independ...

  6. Some approximate Godunov schemes to compute shallow-water equations with topography

    E-Print Network [OSTI]

    Gallouët, Thierry

    Some approximate Godunov schemes to compute shallow-water equations with topography Thierry the computation of shallow-water equations with topography by Finite Volume methods, in a one are based on a discretisation of the topography by a piecewise function constant on each cell of the mesh

  7. Central-Upwind Scheme for Shallow Water Equations with Discontinuous Bottom Topography

    E-Print Network [OSTI]

    Chertock, Alina

    Central-Upwind Scheme for Shallow Water Equations with Discontinuous Bottom Topography Andrew are achieved, in particular, by using continuous piecewise linear interpolation of the bottom topography function. However, when the bottom function is discontinuous or a model with a moving bottom topography

  8. A Statistical Prediction-based Scheme for Energy-aware Multimedia Data Streaming

    E-Print Network [OSTI]

    Bhandarkar, Suchendra "Suchi" M.

    A Statistical Prediction-based Scheme for Energy-aware Multimedia Data Streaming Yong Wei Surendar multimedia objects has fueled the demand of mobile streaming multimedia. A necessary criterion for the mass prediction-based client-side strategies to reduce the wireless network interface card (WNIC) energy

  9. Breaking a secure communication scheme based on the phase synchronization of chaotic systems

    E-Print Network [OSTI]

    G. Alvarez; F. Montoya; G. Pastor; M. Romera

    2003-11-20

    A security analysis of a recently proposed secure communication scheme based on the phase synchronization of chaotic systems is presented. It is shown that the system parameters directly determine the ciphertext waveform, hence it can be readily broken by parameter estimation of the ciphertext signal.

  10. Crypto-analyses on "secure and efficient privacy-preserving public auditing scheme for cloud storage"

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    1 Crypto-analyses on "secure and efficient privacy-preserving public auditing scheme for cloud security in cloud computing" proposed by Wang et al. is insecure and their second work "privacy- preserving public auditing for secure cloud the storage" is inefficient. Thus, they offered a secure and efficient

  11. A Construction of 100 bit Public-Key Cryptosystem and Digital Signature Scheme

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    A Construction of 100 bit Public-Key Cryptosystem and Digital Signature Scheme Masao KASAHARA #3, namely, a class based on bijective transformation and another class based on random transformation. One; #1; #1; ; xn ), the x is transformed to vector y as follows: xA = y; (3) where A is an n #2; n non

  12. An efficient shock-capturing central-type scheme for multidimensional relativistic flows. II. Magnetohydrodynamics

    E-Print Network [OSTI]

    L. Del Zanna; N. Bucciantini; P. Londrillo

    2002-10-29

    A third order shock-capturing numerical scheme for three-dimensional special relativistic magnetohydrodynamics (3-D RMHD) is presented and validated against several numerical tests. The simple and efficient central scheme described in Paper I (Del Zanna and Bucciantini, Astron. Astrophys., 390, 1177--1186, 2002) for relativistic hydrodynamics is here extended to the magnetic case by following the strategies prescribed for classical MHD by Londrillo and Del Zanna (Astrophys. J., 530, 508--524, 2000). The scheme avoids completely spectral decomposition into characteristic waves, computationally expensive and subject to many degenerate cases in the magnetic case, while it makes use of a two-speed Riemann solver that just require the knowledge of the two local fast magnetosonic velocities. Moreover, the onset of spurious magnetic monopoles, which is a typical problem for multi-dimensional MHD upwind codes, is prevented by properly taking into account the solenoidal constraint and the specific antisymmetric nature of the induction equation. Finally, the extension to generalized orthogonal curvilinear coordinate systems is included, thus the scheme is ready to incorporate general relativistic (GRMHD) effects.

  13. An efficient shock-capturing central-type scheme for multidimensional relativistic flows. I. Hydrodynamics

    E-Print Network [OSTI]

    L. Del Zanna; N. Bucciantini

    2002-05-17

    Multidimensional shock-capturing numerical schemes for special relativistic hydrodynamics (RHD) are computationally more expensive than their correspondent Euler versions, due to the nonlinear relations between conservative and primitive variables and to the consequent complexity of the Jacobian matrices (needed for the spectral decomposition in most of the approximate Riemann solvers of common use). Here an efficient and easy-to-implement three-dimensional (3-D) shock-capturing scheme for ideal RHD is presented. Based on the algorithms developed by P. Londrillo and L. Del Zanna ({\\em Astrophys. J.} 530, 508-524, 2000) for the non-relativistic magnetohydrodynamic (MHD) case, and having in mind its relativistic MHD extension (to appear in a forthcoming paper), the scheme uses high order (third) Convex Essentially Non-Oscillatory (CENO) finite difference interpolation routines and central-type averaged Riemann solvers, which do not make use of time-consuming characteristic decomposition. The scheme is very efficient and robust, and it gives results comparable to those obtained with more sophisticated algorithms, even in ultrarelativistic multidimensional test problems.

  14. An Advanced Computational Scheme for the Optimization of 2D Radial Reflectors in Pressurized Water Reactors

    E-Print Network [OSTI]

    Thomas Clerc; Alain Hébert; Hadrien Leroyer; Jean-Philippe Argaud; Bertrand Bouriquet; Agélique Ponçot

    2014-05-12

    This paper presents a computational scheme for the determination of equivalent 2D multi-group heterogeneous reflectors in a Pressurized Water Reactor (PWR). The proposed strategy is to define a full-core calculation consistent with a reference lattice code calculation such as the Method Of Characteristics (MOC) as implemented in APOLLO2 lattice code. The computational scheme presented here relies on the data assimilation module known as "Assimilation de donn\\'{e}es et Aide \\`{a} l'Optimisation (ADAO)" of the SALOME platform developed at \\'{E}lectricit\\'{e} De France (EDF), coupled with the full-core code COCAGNE and with the lattice code APOLLO2. A first validation of the computational scheme is made using the OPTEX reflector model developed at \\'{E}cole Polytechnique de Montr\\'{e}al (EPM). As a result, we obtain 2D multi-group, spatially heterogeneous 2D reflectors, using both diffusion or $\\text{SP}_{\\text{N}}$ operators. We observe important improvements of the power discrepancies distribution over the core when using reflectors computed with the proposed computational scheme, and the $\\text{SP}_{\\text{N}}$ operator enables additional improvements.

  15. LDPC code-based bandwidth efficient coding schemes for wireless communications 

    E-Print Network [OSTI]

    Sankar, Hari

    2009-06-02

    -diversity tradeoff of MIMO-OFDM and SISO-OFDM systems. We design optimal coding schemes which achieve this tradeoff when transmission is from a constrained constellation. Through simulations, we show that with a sub-optimal iterative decoder, the performance...

  16. EAGR: Energy Aware Greedy Routing Scheme for Wireless Ad hoc Networks Sachin Sharma

    E-Print Network [OSTI]

    Dharmaraja, S.

    EAGR: Energy Aware Greedy Routing Scheme for Wireless Ad hoc Networks Sachin Sharma Tejas Networks, throughput and energy consumption. Keywords: Rate of Energy Consumption, Greedy Routing, Wireless Ad hoc distributed nodes that communicate over a wireless link. In this paper we present a scalable, Energy Aware

  17. A Cluster-based Energy Balancing Scheme in Heterogeneous Wireless Sensor Networks

    E-Print Network [OSTI]

    Bölöni, Ladislau L

    A Cluster-based Energy Balancing Scheme in Heterogeneous Wireless Sensor Networks Jing Ai, Damla Unbalanced energy consumption is an inherent problem in wireless sensor networks, and it is largely of energy reserve and wireless communication ability. We transform the flat communication in- frastructure

  18. Atmospheric Environment 40 (2006) 52745297 Influence of the PBL scheme on high-resolution

    E-Print Network [OSTI]

    2006-01-01

    -resolution photochemical simulations in an urban coastal area over the Western Mediterranean Carlos Pe´ reza,Ã, Pedro Jime chemical transport model. The Gayno­Seaman (GS), the Medium Range Forecast (MRF), and the Pleim­Chang (PC) PBL schemes are considered. The simulations focus on a complex coastal urban area (Barcelona

  19. Utility of Joint Processing Schemes Annika Klockar, Carmen Botella, Tommy Svensson, Anna Brunstrom, Mikael Sternad

    E-Print Network [OSTI]

    Utility of Joint Processing Schemes Annika Klockar, Carmen Botella, Tommy Svensson, Anna Brunstrom and increase data rates, in particular at the cell edges. In this paper, we evaluate the utility of Internet applications in a joint processing enabled cluster of base stations. Utility is used to quantify system

  20. A Design Methodology for Link Adaptation Schemes using Constellations of Constant PAPR

    E-Print Network [OSTI]

    Øien, Geir E.

    are then applied to a design example. I. INTRODUCTION Including circuit energy consumption in the global energy communication systems requires the inclusion of circuit energy consumption in the system's total energy budget. We consider the design of link adaptation schemes in which circuit energy consumption is included

  1. Energy Efficient Scheme for Cognitive Radios Utilizing Soft AbdulRahman Alabbasi , Zouheir Rezki , Basem Shihada

    E-Print Network [OSTI]

    Shihada, Basem

    Energy Efficient Scheme for Cognitive Radios Utilizing Soft Sensing AbdulRahman Alabbasi , Zouheir sensing information to achieve a sub-optimum energy efficient system. The sub-optimality is achieved consider an Energy per Goodbit (EPG) metric to express the energy efficient objective function

  2. Acceptance test procedure for removal of CS1K circuit switcher block and trip schemes

    SciTech Connect (OSTI)

    HACHE, J.M.

    1999-08-25

    This supporting document provides a detailed process to test the functions of the circuit switcher, protective relays, alarms, SCADA and 125VDC control logic of 115kV and 13.8kV systems at B3S4 substation following the removal of trip and blocking schemes to Transformer No.1 Circuit Switcher B594.

  3. OFFLINE EVALUATION OF SIX SURFACE LAYER PARAMETERIZATION SCHEMES AGAINST OBSERVATIONS AT THE ARM SGP SITE

    E-Print Network [OSTI]

    OFFLINE EVALUATION OF SIX SURFACE LAYER PARAMETERIZATION SCHEMES AGAINST OBSERVATIONS AT THE ARM of surface fluxes collected by the DOE (Department of Energy) ARM (Atmospheric Radiation Measurement) program to quantify the uncertainty/discrepancy between the ARM measurements based on the EC (Eddy Correlation

  4. A Privacy-Preserving Scheme for Incentive-Based Demand Response in the Smart Grid

    E-Print Network [OSTI]

    Fang, Yuguang "Michael"

    1 A Privacy-Preserving Scheme for Incentive-Based Demand Response in the Smart Grid Yanmin Gong to both grid operators and customers, exploiting the full potential of demand response. However to be attributable to individuals. However, this assumption does not hold in incentive-based demand response (IDR

  5. A Simple Control Scheme for Near-optimal Operation of Parallel Heat Exchanger Systems

    E-Print Network [OSTI]

    Skogestad, Sigurd

    A Simple Control Scheme for Near-optimal Operation of Parallel Heat Exchanger Systems Johannes J) N-7491 Trondheim, Norway Abstract For heat exchanger networks with stream splits, we present for systems with logarithmic mean temperature difference as driving force. Keywords: Heat exchanger networks

  6. An adaptive scaling and biasing scheme for OFDM-based visible light

    E-Print Network [OSTI]

    Chen, Sheng

    An adaptive scaling and biasing scheme for OFDM-based visible light communication systems Zhaocheng. Haruyama, and M. Nakagawa, "Adaptive equalization system for visible light wireless communication utilizing-division multiplexing (OFDM) has been widely used in visible light communication systems to achieve high-rate data

  7. Improved scheme for generation of vibrational trio coherent states of a trapped ion

    E-Print Network [OSTI]

    Hyo Seok Yi; Ba An Nguyen; Jaewan Kim

    2003-05-14

    We improve a previously proposed scheme (Phys. Rev. A 66 (2002) 065401) for generating vibrational trio coherent states of a trapped ion. The improved version is shown to gain a double advantage: (i) it uses only five, instead of eight, lasers and (ii) the generation process can be made remarkably faster.

  8. Analogue to information system based on PLL-based frequency synthesizers with fast locking schemes 

    E-Print Network [OSTI]

    Lin, Ming-Lang

    2010-01-01

    rate being limited in applications a novel irregular data conversion scheme called analogue-to-information system (AIS) is proposed in this thesis. The AIS is typically based upon LCSS, but an adjustable clock generator and a real time data compression...

  9. A mixed finite-element scheme of a semiconductor energy-transport model

    E-Print Network [OSTI]

    Hanke-Bourgeois, Martin

    A mixed finite-element scheme of a semiconductor energy-transport model using dual entropy which are able to deal with physical effects such as carrier heating and velocity overshoot. The energy that the Joule heating term vanishes if the dual entropy variables w1 = (µ - V )/T and w2 = -1/T are employed

  10. Fast Superiorization Using a Dual Perturbation Scheme for Proton Computed Tomography , R. W. Schulte2

    E-Print Network [OSTI]

    Censor, Yair

    -Averaging Projections (SAP) or Block Iterative Projection (BIP) methods). In pCT the parallel schemes are preferred on the general principle that many classes of projection methods (such as SAP and BIP) are perturbation resilient results [2,3]. These methods are used for solving a linear system of equations of the form (1) where

  11. Definition. scheme X PicX := {invertible sheaf onX}/isom, Pic0

    E-Print Network [OSTI]

    Kaji, Hajime

    ( ) 16 2 9 Definition. scheme X PicX := {invertible sheaf onX}/isom, Pic0 X := {L PicX | degL = 0}, . . Fact. C nonsingular complete curve . Pic0 C abelian variety , C genus . Fact nonsingular , , singular curve). C: x3 = y2 z in P2 k Pic0 C = Ga := (k, +) . picard variety , abelian variety , Ga , arithemetic

  12. An Optimal Resource Control Scheme under Fidelity and Energy Constraints in Sensor Networks

    E-Print Network [OSTI]

    Zhang, Yanyong

    networks, Resource control, Fidelity, Energy efficiency I. INTRODUCTION As the technologies in MEMS1 An Optimal Resource Control Scheme under Fidelity and Energy Constraints in Sensor Networks control under the fidelity and energy constraints, we present a resource increase and decrease algorithm

  13. LOCALIZATION EFFECTS AND MEASURE SOURCE TERMS IN NUMERICAL SCHEMES FOR BALANCE LAWS

    E-Print Network [OSTI]

    LOCALIZATION EFFECTS AND MEASURE SOURCE TERMS IN NUMERICAL SCHEMES FOR BALANCE LAWS LAURENT GOSSE corresponds to the general case of a scalar balance law (26). These two problems share the common feature) is the key point and the general balance law, where a long- time decay to some steady regime should occur

  14. Load-Balanced Routing Scheme for Energy-Efficient Wireless Sensor Networks

    E-Print Network [OSTI]

    Boutaba, Raouf

    Load-Balanced Routing Scheme for Energy-Efficient Wireless Sensor Networks Fatma Bouabdallah, Nizar. In this paper, we investigate the potential energy conservation achieved by balancing the traffic throughout, load balancing, performance analysis. I. INTRODUCTION In order to minimize the energy consumption

  15. A New Approximation Scheme for the Group Steiner Problem C. S. Helvig Gabriel Robins Alexander Zelikovsky

    E-Print Network [OSTI]

    Zelikovsky, Alexander

    correspond to a group of up to eight nodes in the Group #3; This work was supported by a Packard Foundation a group of up to eight virtual positions (c). The only existing approximation algorithms for the GroupA New Approximation Scheme for the Group Steiner Problem #3; C. S. Helvig Gabriel Robins Alexander

  16. Coupling schemes for modeling hydraulic fracture propagation using the XFEM Elizaveta Gordeliy, Anthony Peirce

    E-Print Network [OSTI]

    Peirce, Anthony

    Coupling schemes for modeling hydraulic fracture propagation using the XFEM Elizaveta Gordeliy August 2012 Accepted 18 August 2012 Available online 15 September 2012 Keywords: XFEM Hydraulic fractures and the Dirichlet to Neumann (DN) map with OðhÞ accuracy. For hydraulic fracture problems with a lag separating

  17. Implicit level set schemes for modeling hydraulic fractures using the Elizaveta Gordeliy, Anthony Peirce

    E-Print Network [OSTI]

    Peirce, Anthony

    Implicit level set schemes for modeling hydraulic fractures using the XFEM Elizaveta Gordeliy Copyright Ó 2013 Published by Elsevier B.V. All rights reserved. 1. Introduction Hydraulic fractures (HF form 13 July 2013 Accepted 27 July 2013 Available online 20 August 2013 Keywords: XFEM Hydraulic

  18. A Simple Asymptotically Optimal Joint Energy Allocation and Routing Scheme in Rechargeable

    E-Print Network [OSTI]

    1 A Simple Asymptotically Optimal Joint Energy Allocation and Routing Scheme in Rechargeable Sensor problem for a sensor network with energy replenishment. Each sensor node consumes energy in its battery of the optimum. Through simulations with replenishment profile traces for solar and wind energy, we numerically

  19. J-RoC: a Joint Routing and Charging Scheme to Prolong Sensor Network Lifetime

    E-Print Network [OSTI]

    Qiao, Daji

    -lasting and fundamental problem. To address this issue, harvesting the ambient energy such as solar [1], wind [2. Zhang et al. [7] apply this technique to replenish battery energy in med- ical sensors and implantableJ-RoC: a Joint Routing and Charging Scheme to Prolong Sensor Network Lifetime Zi Li, Yang Peng

  20. A Traffic-Aware Street Lighting Scheme for Smart Cities using Autonomous Networked Sensors

    E-Print Network [OSTI]

    1 A Traffic-Aware Street Lighting Scheme for Smart Cities using Autonomous Networked Sensors Sei: Adaptive street lighting, smart streetlights, smart cities, networked sensing 1. Introduction a sustainable and liveable city, the concept of Smart Cities has been proposed. Key to this vision

  1. A stress interpretation scheme applied to lunar gravity and topography data

    E-Print Network [OSTI]

    A stress interpretation scheme applied to lunar gravity and topography data F. Chambat1 and B to be directly related to the deviatoric stresses without any rheological assumptions. In this approach a new set above the corresponding equipotential surfaces and (2) the stress difference. The method is applied

  2. On the (in)security of some smart-card-based password authentication schemes for WSN

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    On the (in)security of some smart-card-based password authentication schemes for WSN Ding Wang1 operations and thus is suitable for the resource-constrained WSN environments where an external user wants-tamper-resistant smart cards for WSN. We hope that, by following this principle, similar mistakes repeated in the past

  3. A REAL-TIME ITERATION SCHEME FOR NONLINEAR OPTIMIZATION IN OPTIMAL FEEDBACK CONTROL

    E-Print Network [OSTI]

    " and within the research project "Optimization Based Control of Chemical Processes." httpA REAL-TIME ITERATION SCHEME FOR NONLINEAR OPTIMIZATION IN OPTIMAL FEEDBACK CONTROL MORITZ DIEHL, HANS GEORG BOCK, AND JOHANNES P. SCHL¨ODER SIAM J. CONTROL OPTIM. c 2005 Society for Industrial

  4. Lax-Friedrichs Sweeping Scheme for Static Hamilton-Jacobi Equations

    E-Print Network [OSTI]

    Ferguson, Thomas S.

    Lax-Friedrichs Sweeping Scheme for Static Hamilton-Jacobi Equations Chiu Yen Kao , Stanley Osher-Friedrichs monotone numerical Hamiltonian to approximate the viscosity solution of arbitrary static Hamilton-Jacobi the Hamilton-Jacobi equation directly without assuming convexity and/or homogeneity of the Hamiltonian. 1

  5. Lax-Friedrichs Sweeping Scheme for Static Hamilton-Jacobi Equations

    E-Print Network [OSTI]

    Ferguson, Thomas S.

    Lax-Friedrichs Sweeping Scheme for Static Hamilton-Jacobi Equations #3; Chiu Yen Kao y , Stanley static Hamilton-Jacobi equations in any number of spatial di- mensions. By using the Lax, this is the #28;rst fast numerical method based on discretizing the Hamilton-Jacobi equation directly without

  6. A Weighted Interference Estimation Scheme for Interface Switching Wireless Mesh Networks

    E-Print Network [OSTI]

    . Typically, a WMN is a collection of wireless mesh routers and wireless mobile mesh clients. Wireless mesh to wireless mesh routers via either wired or wireless connections. In addition, a small number of wirelessA Weighted Interference Estimation Scheme for Interface Switching Wireless Mesh Networks Yunxia

  7. A Weighted Interference Estimation Scheme for Interface Switching Wireless Mesh Networks

    E-Print Network [OSTI]

    . A WMN is a collection of stationary wireless mesh routers and mobile mesh clients. Wireless mesh routers mesh routers via traditional Ethernet or wireless connections. Through multi-hop wireless relay, mobileA Weighted Interference Estimation Scheme for Interface Switching Wireless Mesh Networks Yunxia

  8. PreDVS: Preemptive Dynamic Voltage Scaling for Real-time Systems using Approximation Scheme

    E-Print Network [OSTI]

    Mishra, Prabhat

    , dynamic voltage scal- ing, approximation algorithm 1. INTRODUCTION Energy conservation has been the main to save energy is that linear reduction in the supply voltage leads to approximately linear slow downPreDVS: Preemptive Dynamic Voltage Scaling for Real-time Systems using Approximation Scheme Weixun

  9. Study of a numerical scheme for miscible two-phase flow in porous media

    E-Print Network [OSTI]

    Boyer, Edmond

    holds for CO2 storage, gas pro- duction, and other situations. For x and t [0, T], we consider Schleper November 21, 2013 Abstract We study the convergence of a finite volume scheme for a model of miscible two-phase flow in porous media. In this model, one phase can dissolve into the other one

  10. A new scheme of radiation transfer in H II regions including transient heating of grains

    E-Print Network [OSTI]

    S. K. Ghosh; R. P. Verma

    2000-09-21

    A new scheme of radiation transfer for understanding infrared spectra of H II regions, has been developed. This scheme considers non-equilibrium processes (e. g. transient heating of the very small grains, VSG; and the polycyclic aromatic hydrocarbon, PAH) also, in addition to the equilibrium thermal emission from normal dust grains (BG). The spherically symmetric interstellar dust cloud is segmented into a large number of "onion skin" shells in order to implement the non-equilibrium processes. The scheme attempts to fit the observed SED originating from the dust component, by exploring the following parameters : (i) geometrical details of the dust cloud, (ii) PAH size and abundance, (iii) composition of normal grains (BG), (iv) radial distribution of all dust (BG, VSG & PAH). The scheme has been applied to a set of five compact H II regions (IRAS 18116- 1646, 18162-2048, 19442+2427, 22308+5812 & 18434-0242) whose spectra are available with adequate spectral resolution. The best fit models and inferences about the parameters for these sources are presented.

  11. Self-Encryption Scheme for Data Security in Mobile Devices Yu Chen* and

    E-Print Network [OSTI]

    Chen, Yu

    Self-Encryption Scheme for Data Security in Mobile Devices Yu Chen* and Wei-Shinn Ku Dept networks and mobile devices has been changing our living style significantly. Along with great convenience. The bit stream is encrypted and the ciphertext is stored on the mobile device, whereas the keystream

  12. Man-in-the-Middle Secure Authentication Schemes from LPN and Weak PRFs

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    and its more efficient variants such as Toeplitz-LPN and Ring-LPN. Building a man-in-the-middle secure building a man-in-the- middle secure scheme based on any variant of the LPN problem solves the main open-cost devices, such as smart cards and RFID tags, in the real world. One of the most common cryptographic

  13. AN ADAPTIVE MIXED SCHEME FOR ENERGY-TRANSPORT SIMULATIONS OF FIELD-EFFECT TRANSISTORS

    E-Print Network [OSTI]

    Pietra, Paola

    AN ADAPTIVE MIXED SCHEME FOR ENERGY-TRANSPORT SIMULATIONS OF FIELD-EFFECT TRANSISTORS #3; STEFAN HOLST, ANSGAR J  UNGEL y AND PAOLA PIETRA z Abstract. Energy-transport models are used in semiconductor simulations to account for ther- mal e#11;ects. The model consists of the continuity equations for the mass

  14. Kyotoforcommuters Offset schemes are a small but potentially useful addition to the carbon balance sheet.

    E-Print Network [OSTI]

    Cai, Long

    Kyotoforcommuters Offset schemes are a small but potentially useful addition to the carbon balance emissions in regions of the world where it is inexpensive to do so: for example, households in India or Peru address the issue. Consumers of goods and services that depend on the burning of fossil fuels also have

  15. Influence of hole shape on the performance of a turbine vane endwall film-cooling scheme

    E-Print Network [OSTI]

    Thole, Karen A.

    Rising combustor exit temperatures in gas turbine engines necessitate active cooling for the downstream industrial gas turbine engines. One means of achieving this goal is to increase the combustion temper- ature are so high in today's gas turbine engines that in the absence of complex cooling schemes the turbine

  16. An alternative subtraction scheme for NLO QCD calculations using Nagy-Soper dipoles

    E-Print Network [OSTI]

    Markus Bach; Cheng Han Chung; Tania Robens

    2013-11-22

    In this work, we briefly report on the current status of an alternative subtraction scheme which is based on the splitting kernels of an improved parton shower prescription. Our focus is here on more recent developments as well as generic arguments on the scaling behaviour.

  17. Green-Frag: Energy-Efficient Frame Fragmentation Scheme for Wireless Sensor Networks

    E-Print Network [OSTI]

    Shihada, Basem

    Green-Frag: Energy-Efficient Frame Fragmentation Scheme for Wireless Sensor Networks Anas that frame fragmenta- tion also helps to reduce energy consumption. In this paper we propose Green-Frag, a new energy-efficient protocol based on efficient frame fragmentation technique. Green-Frag allows

  18. High-Order Accurate Implicit Scheme for Drift-Diffusion Equations and Application to Dielectric

    E-Print Network [OSTI]

    D'Ambrosio, Domenic

    High-Order Accurate Implicit Scheme for Drift-Diffusion Equations and Application to Dielectric. Governing equations consist of continuity equations of charged particles in drift diffusion approximation for temporal discretization, in order to decouple drift and diffusion effects from chemical production ones

  19. A Distributed Scheme for Efficient Pair-wise Comparison of Complete Genomes

    E-Print Network [OSTI]

    Bansal, Arvind K.

    #12;48 A Distributed Scheme for Efficient Pair-wise Comparison of Complete Genomes Valerian S}@mcs.kent.edu 1 Corresponding author Abstract The comparisons of newly sequenced genomes against a genome and a CORBA-based implementation to compare and align gene sequences in large complete genomes, using multiple

  20. MODEL PREDICTIVE CONTROL SCHEMES FOR THE MITIGATION OF NATU-RAL HAZARDS: THEORETICAL AND EXPERIMENTAL STUDIES

    E-Print Network [OSTI]

    Kareem, Ahsan

    the wind induced structural response. A shaking table and a small-scale structural model with an active reduction. Finally, a full-scale building for wind-excited benchmark problem was investigated to implement to enhance the performance of structures during earthquakes and strong winds. Efficient control schemes

  1. A Mesochronous Pipeline Scheme for High Performance Low Power Digital Systems

    E-Print Network [OSTI]

    Delgado-Frias, José G.

    A Mesochronous Pipeline Scheme for High Performance Low Power Digital Systems Suryanarayana B University Pullman, WA 99164-2752 Email: {statapud, jdelgado}geecs.wsu.edu Abstract- A mesochronous pipeline mesochronous pipeline over conventional pipeline architecture. in size (longer wires with increased parasitic

  2. Notice to opt out of pension saving University of Aberdeen Superannuation & Life Assurance Scheme (UASLAS)

    E-Print Network [OSTI]

    Siddharthan, Advaith

    Notice to opt out of pension saving University of Aberdeen Superannuation & Life Assurance Scheme (UASLAS) Notice to opt out of pension saving This form is the notice for withdrawal from UASLAS whilst remaining in pensionable employment at University of Aberdeen. If you want to opt out of pension saving

  3. CRBcast: A Collaborative Rateless Scheme for Reliable and Energy-Efficient Broadcasting in Wireless Sensor

    E-Print Network [OSTI]

    Rahnavard, Nazanin

    Sensor Networks Nazanin Rahnavard School of Electrical and Computer Engineering Georgia Institute in reliability and energy efficiency of the broadcasting scheme for multi-hop wireless sensor networks. Our two, theory. design Keywords Wireless sensor networks, broadcasting, reliability, energy efficiency, rateless

  4. A wetting and drying scheme for POM Lie-Yauw Oey *

    E-Print Network [OSTI]

    that contain hydraulic jumps, including a laboratory dam-break problem. Ó 2004 Published by Elsevier Ltd.e. hydraulic jumps and/or bores) can develop. A WAD scheme is proposed and applied to the Princeton Ocean Model. Keywords: Wetting and drying; Dam-break; Flood and ebb; Princeton ocean model 1. Introduction Wetting

  5. A UNIFIED NEAR-INFRARED SPECTRAL CLASSIFICATION SCHEME FOR T DWARFS Adam J. Burgasser,1,2

    E-Print Network [OSTI]

    Burgasser, Adam J.

    A UNIFIED NEAR-INFRARED SPECTRAL CLASSIFICATION SCHEME FOR T DWARFS Adam J. Burgasser,1,2 T. R 2005 October 3 ABSTRACT A revised near-infrared classification scheme for T dwarfs is presented, based identified largely in the Sloan Digital Sky Survey and the Two Micron All Sky Survey, nine primary spectral

  6. A Three Level Finite Difference Scheme for Solving the Pennes' Bioheat Transfer in a TripleLayered Skin

    E-Print Network [OSTI]

    Zhang, Jun

    . A convergence theorem is obtained by the discrete energy method, implying that the scheme is un­ conditionally the discrete energy method, we establish a convergence theorem for the finite difference scheme, which shows stable. Numerical results for thermal analysis of a skin composed of epidermis, dermis and subcutaneous

  7. Diagnosis of the Low-Level Jet using a sounding analysis scheme and the ETA model, a case study 

    E-Print Network [OSTI]

    Wigginton, Scott Barrett

    2000-01-01

    studied using this analysis scheme during a case study from May 1995. The data set used consisted of 80-km Eta model output. When compared to other methods, the developed analysis scheme showed more LLJ detail and structure. The LLJ appeared with multiple...

  8. FREEDOM OF INFORMATION ACT 2000 PUBLICATION SCHEME In implementing the Freedom of Information Act 2000 Nottingham Trent

    E-Print Network [OSTI]

    Evans, Paul

    FREEDOM OF INFORMATION ACT 2000 ­ PUBLICATION SCHEME In implementing the Freedom of Information Act and by providing clear information about our policies and processes through our publication scheme. We deal with individual requests for information courteously and promptly and provide advice and assistance if necessary

  9. PAGE 5 OF 9GROUP OF EIGHT AUSTRALIAGERMANY JOINT RESEARCH COOPERATION SCHEME GROUP OF EIGHT Application form

    E-Print Network [OSTI]

    Kheifets, Anatoli

    PAGE 5 OF 9GROUP OF EIGHT AUSTRALIA­GERMANY JOINT RESEARCH COOPERATION SCHEME © GROUP OF EIGHT) 6,110 Euro (year 2013) #12;PAGE 6 OF 9GROUP OF EIGHT AUSTRALIA­GERMANY JOINT RESEARCH COOPERATION SCHEME © GROUP OF EIGHT FUNDING REQUESTED (BUDGET SUMMARY) Year: 2012 Airfares (economy class) AUD Per

  10. Performance Analysis of Battery Power Management Schemes in Wireless Mobile Balakrishna J. Prabhu, A. Chockalingam and Vinod Sharma

    E-Print Network [OSTI]

    Sharma, Vinod

    Performance Analysis of Battery Power Management Schemes in Wireless Mobile Devices Balakrishna J Abstract--In this paper, we analyze the performance of battery power management schemes in wireless mobile devices using a queueing theory approach. We model the battery as a server with finite service capacity

  11. Multiplexing scheme for simplified entanglement-based large-alphabet quantum key distribution

    E-Print Network [OSTI]

    Dada, Adetunmise C

    2015-01-01

    We propose a practical quantum cryptographic scheme which combines high information capacity, such as provided by high-dimensional quantum entanglement, with the simplicity of a two-dimensional Clauser-Horne-Shimony-Holt (CHSH) Bell test for security verification. By applying a state combining entanglement in a two-dimensional degree of freedom, such as photon polarization, with high-dimensional correlations in another degree of freedom, such as photon orbital angular momentum (OAM) or path, the scheme provides a considerably simplified route towards security verification in quantum key distribution (QKD) aimed at exploiting high-dimensional quantum systems for increased secure key rates. It also benefits from security against collective attacks and is feasible using currently available technologies.

  12. LHC luminosity upgrade with large Piwinski angle scheme: a recent look

    SciTech Connect (OSTI)

    Bhat, C.M.; Zimmermann, f.; /CERN

    2011-09-01

    Luminosity upgrade at the LHC collider using longitudinally flat bunches in combination with the large crossing angle (large Piwinski angle scheme) is being studied with renewed interest in recent years. By design, the total beam-beam tune shift at the LHC is less than 0.015 for two interaction points together. But the 2010-11 3.5 TeV collider operation and dedicated studies indicated that the beam-beam tune shift is >0.015 per interaction point. In view of this development we have revisited the requirements for the Large Piwinski Angle scheme at the LHC. In this paper we present a new set of parameters and luminosity calculations for the desired upgrade by investigating: (1) current performance of the LHC injectors, (2) e-cloud issues on nearly flat bunches and (3) realistic beam particle distributions from longitudinal beam dynamics simulations. We also make some remarks on the needed upgrades on the LHC injector accelerators.

  13. An improved approximation scheme for the centrifugal term and the Hulthen potential

    E-Print Network [OSTI]

    Sameer M. Ikhdair

    2009-01-07

    We present a new approximation scheme for the centrifugal term to solve the Schrodinger equation with the Hulthen potential for any arbitrary l state by means of a mathematical Nikiforov-Uvarov (NU) method. We obtain the bound state energy eigenvalues and the normalized corresponding eigenfunctions expressed in terms of the Jacobi polynomials or hypergeometric functions for a particle exposed to this potential field. Our numerical results of the energy eigenvalues are found to be in high agreement with those results obtained by using the program based on a numerical integration procedure. The s-wave (l=0) analytic solution for the binding energies and eigenfunctions of a particle are also calculated. The physical meaning of the approximate analytical solution is discussed. The present approximation scheme is systematic and accurate.

  14. Conceptual MEIC electron ring injection scheme using CEBAF as a full energy injector

    SciTech Connect (OSTI)

    Guo, Jiquan; Lin, Fanglei; Rimmer, Robert A.; Wang, Haipeng; Wang, Shaoheng; Zhang, Yuhong

    2015-09-01

    The Medium-energy Electron-Ion Collider (MEIC) proposed by Jefferson Lab is planning to use the newly upgraded 12 GeV CEBAF 1497 MHz SRF CW recirculating linac as a full-energy injector for the electron collider ring. The electron collider ring is proposed to reuse the 476MHz PEP-II RF system to achieve high installed voltage and high beam power. The MEIC electron injection requires 3-10 (or 12) GeV beam in 3-4µs long bunch trains with low duty factor and high peak current, resulting in strong transient beam loading for the CEBAF. In this paper, we propose an injection scheme that can match the two systems' frequencies with acceptable injection time, and also address the transient beam loading issue in CEBAF. The scheme is compatible with future upgrade to 952.6 MHz SRF system in the electron ring.

  15. Thin-disk laser pump schemes for large number of passes and moderate pump source quality

    E-Print Network [OSTI]

    Schuhmann, K; Kirch, K; Knecht, A; Kottmann, F; Nez, F; Pohl, R; Taqqu, D; Antognini, A

    2015-01-01

    Novel thin-disk laser pump layouts are proposed yielding an increased number of passes for a given pump module size and pump source quality. These novel layouts result from a general scheme which bases on merging two simpler pump optics arrangements. Some peculiar examples can be realized by adapting standard commercially available pump optics simply by intro ducing an additional mirror-pair. More pump passes yield better efficiency, opening the way for usage of active materials with low absorption. In a standard multi-pass pump design, scaling of the number of beam passes brings ab out an increase of the overall size of the optical arrangement or an increase of the pump source quality requirements. Such increases are minimized in our scheme, making them eligible for industrial applications

  16. Two schemes for characterization and detection of the squeezed light: Dynamical Casimir effect and nonlinear materials

    E-Print Network [OSTI]

    H. Lotfipour; Z. Allameh; R. Roknizadeh; H. Heydari

    2015-05-04

    The detection and characterization of a non-classical-squeezed state of light, by using two different schemes, will be presented . In the first one, in an one-dimensional cavity with moving mirror (non-stationary Casimir effect) in the principal mode, we study the photon creation rate for two modes (squeezed and coherent state) of driving field. Since the cavity with moving mirror (similar to an optomechanical system) can be considered analogue to a Kerr-like medium, so that in the second scheme, the probability amplitude for multi-photons absorption in a nonlinear (Kerr) medium will be quantum mechanically calculated. It is shown that because of presence of nonlinear effects, the responses of these two systems to the squeezed versus coherent state are considerably distinguishable. The drastic difference between the results of these two states of light can be viewed as a proposal for detecting of non-classical states.

  17. An Explicit Scheme for Incorporating Ambipolar Diffusion in a Magnetohydrodynamics Code

    E-Print Network [OSTI]

    Choi, Eunwoo; Wiita, Paul J

    2008-01-01

    We describe a method for incorporating ambipolar diffusion in the strong coupling approximation into a multidimensional magnetohydrodynamics code based on the total variation diminishing scheme. Contributions from ambipolar diffusion terms are included by explicit finite difference operators in a fully unsplit way, maintaining second order accuracy. The divergence-free condition of magnetic fields is exactly ensured at all times by a flux-interpolated constrained transport scheme. The super time stepping method is used to accelerate the timestep in high resolution calculations and/or in strong ambipolar diffusion. We perform two test problems, the steady-state oblique C-type shocks and the decay of Alfv\\'en waves, confirming the accuracy and robustness of our numerical approach. Results from the simulations of the compressible MHD turbulence with ambipolar diffusion show the flexibility of our method as well as its ability to follow complex MHD flows in the presence of ambipolar diffusion. These simulations s...

  18. Astrophysical hydrodynamics with a high-order discontinuous Galerkin scheme and adaptive mesh refinement

    E-Print Network [OSTI]

    Schaal, Kevin; Chandrashekar, Praveen; Pakmor, Rüdiger; Klingenberg, Christian; Springel, Volker

    2015-01-01

    Solving the Euler equations of ideal hydrodynamics as accurately and efficiently as possible is a key requirement in many astrophysical simulations. It is therefore important to continuously advance the numerical methods implemented in current astrophysical codes, especially also in light of evolving computer technology, which favours certain computational approaches over others. Here we introduce the new adaptive mesh refinement (AMR) code TENET, which employs a high-order Discontinuous Galerkin (DG) scheme for hydrodynamics. The Euler equations in this method are solved in a weak formulation with a polynomial basis by means of explicit Runge-Kutta time integration and Gauss-Legendre quadrature. This approach offers significant advantages over commonly employed finite volume (FV) solvers. In particular, the higher order capability renders it computationally more efficient, in the sense that the same precision can be obtained at significantly less computational cost. Also, the DG scheme inherently conserves a...

  19. Scheme for precise correction of orbit variation caused by dipole error field of insertion device

    SciTech Connect (OSTI)

    Nakatani, T.; Agui, A.; Aoyagi, H.; Matsushita, T.; Takao, M.; Takeuchi, M.; Yoshigoe, A.; Tanaka, H.

    2005-05-15

    We developed a scheme for precisely correcting the orbit variation caused by a dipole error field of an insertion device (ID) in a storage ring and investigated its performance. The key point for achieving the precise correction is to extract the variation of the beam orbit caused by the change of the ID error field from the observed variation. We periodically change parameters such as the gap and phase of the specified ID with a mirror-symmetric pattern over the measurement period to modulate the variation. The orbit variation is measured using conventional wide-frequency-band detectors and then the induced variation is extracted precisely through averaging and filtering procedures. Furthermore, the mirror-symmetric pattern enables us to independently extract the orbit variations caused by a static error field and by a dynamic one, e.g., an error field induced by the dynamical change of the ID gap or phase parameter. We built a time synchronization measurement system with a sampling rate of 100 Hz and applied the scheme to the correction of the orbit variation caused by the error field of an APPLE-2-type undulator installed in the SPring-8 storage ring. The result shows that the developed scheme markedly improves the correction performance and suppresses the orbit variation caused by the ID error field down to the order of submicron. This scheme is applicable not only to the correction of the orbit variation caused by a special ID, the gap or phase of which is periodically changed during an experiment, but also to the correction of the orbit variation caused by a conventional ID which is used with a fixed gap and phase.

  20. A two-step chemical scheme for kerosene-air premixed flames

    SciTech Connect (OSTI)

    Franzelli, B.; Riber, E.; Sanjose, M. [CERFACS, CFD Team, 42 Avenue G. Coriolis, 31057 Toulouse Cedex 01 (France); Poinsot, T. [IMFT-UMR 5502, allee du Professeur Camille Soula, 31400 Toulouse (France)

    2010-07-15

    A reduced two-step scheme (called 2S-KERO-BFER) for kerosene-air premixed flames is presented in the context of Large Eddy Simulation of reacting turbulent flows in industrial applications. The chemical mechanism is composed of two reactions corresponding to the fuel oxidation into CO and H{sub 2}O, and the CO - CO{sub 2} equilibrium. To ensure the validity of the scheme for rich combustion, the pre-exponential constants of the two reactions are tabulated versus the local equivalence ratio. The fuel and oxidizer exponents are chosen to guarantee the correct dependence of laminar flame speed with pressure. Due to a lack of experimental results, the detailed mechanism of Dagaut composed of 209 species and 1673 reactions, and the skeletal mechanism of Luche composed of 91 species and 991 reactions have been used to validate the reduced scheme. Computations of one-dimensional laminar flames have been performed with the 2S{sub K}ERO{sub B}FER scheme using the CANTERA and COSILAB softwares for a wide range of pressure ([1; 12] atm), fresh gas temperature ([300; 700] K), and equivalence ratio ([0.6; 2.0]). Results show that the flame speed is correctly predicted for the whole range of parameters, showing a maximum for stoichiometric flames, a decrease for rich combustion and a satisfactory pressure dependence. The burnt gas temperature and the dilution by Exhaust Gas Recirculation are also well reproduced. Moreover, the results for ignition delay time are in good agreement with the experiments. (author)

  1. A refined r-factor algorithm for TVD schemes on arbitrary unstructured meshes

    E-Print Network [OSTI]

    Zhang, Di; Jiang, Chunbo; Cheng, Liang; Liang, Dongfang

    2015-07-03

    and Offshore Engineering, Dalian University of Technology, Dalian, 116024, China 4Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK SUMMARY A refined r-factor algorithm for implementing TVD schemes... ’s and Hou’s algorithms also require different formulations for boundary cells in order to be applicable in all situations. To ensure the physical boundedness of Uq , all the neighboring cells and boundary faces of the up-wind cell C are considered except...

  2. Cirrus clouds in a global climate model with a statistical cirrus cloud scheme

    SciTech Connect (OSTI)

    Wang, Minghuai; Penner, Joyce E.

    2010-06-21

    A statistical cirrus cloud scheme that accounts for mesoscale temperature perturbations is implemented in a coupled aerosol and atmospheric circulation model to better represent both subgrid-scale supersaturation and cloud formation. This new scheme treats the effects of aerosol on cloud formation and ice freezing in an improved manner, and both homogeneous freezing and heterogeneous freezing are included. The scheme is able to better simulate the observed probability distribution of relative humidity compared to the scheme that was implemented in an older version of the model. Heterogeneous ice nuclei (IN) are shown to decrease the frequency of occurrence of supersaturation, and improve the comparison with observations at 192 hPa. Homogeneous freezing alone can not reproduce observed ice crystal number concentrations at low temperatures (<205 K), but the addition of heterogeneous IN improves the comparison somewhat. Increases in heterogeneous IN affect both high level cirrus clouds and low level liquid clouds. Increases in cirrus clouds lead to a more cloudy and moist lower troposphere with less precipitation, effects which we associate with the decreased convective activity. The change in the net cloud forcing is not very sensitive to the change in ice crystal concentrations, but the change in the net radiative flux at the top of the atmosphere is still large because of changes in water vapor. Changes in the magnitude of the assumed mesoscale temperature perturbations by 25% alter the ice crystal number concentrations and the net radiative fluxes by an amount that is comparable to that from a factor of 10 change in the heterogeneous IN number concentrations. Further improvements on the representation of mesoscale temperature perturbations, heterogeneous IN and the competition between homogeneous freezing and heterogeneous freezing are needed.

  3. A Differential Phase Shift Scheme for Quantum Key Distribution in Passive Optical Networks

    E-Print Network [OSTI]

    Michael Hentschel; Andreas Poppe; Bernhard Schrenk; Momtchil Peev; Edwin Querasser; Roland Lieger

    2014-12-19

    We propose a scheme for quantum key distribution (QKD) in a passive optical network (PON) based on differential phase shift (DPS) coding. A centralized station including all expensive components serves many users, making it suitable for a true multi-user network in a local environment with moderate distances on the order of a few kilometers. The emphasis lies on an asymmetric design for cost effective implementation of network end points.

  4. The generalized zero-mode supersymmetry scheme and the confluent algorithm

    E-Print Network [OSTI]

    Alonso Contreras-Astorga; Axel Schulze-Halberg

    2015-04-09

    We show the relationship between the mathematical framework used in recent papers by H.C. Rosu, S.C. Mancas and P. Chen (2014) and the second-order confluent supersymmetric quantum mechanics. In addition, we point out several immediate generalizations of the approach taken in the latter references. Furthermore, it is shown how to apply the generalized scheme to the Dirac and to the Fokker-Planck equation.

  5. Control scheme for power modulation of a free piston Stirling engine

    DOE Patents [OSTI]

    Dhar, Manmohan (Schenectady, NY)

    1989-01-01

    The present invention relates to a control scheme for power modulation of a free-piston Stirling engine-linear alternator power generator system. The present invention includes connecting an autotransformer in series with a tuning capacitance between a linear alternator and a utility grid to maintain a constant displacement to piston stroke ratio and their relative phase angle over a wide range of operating conditions.

  6. Introduction Numerical methods Computational results Higher order schemes Summary Adaptive high-resolution methods for

    E-Print Network [OSTI]

    Deiterding, Ralf

    Higher order schemes Summary Governing equations Equation of state Ideal gas law and Dalton's law for gas Ideal gas law and Dalton's law for gas-mixtures p(1, . . . , K , T) = K i=1 pi = K i=1 i R Wi T = R W equations Equation of state Ideal gas law and Dalton's law for gas-mixtures p(1, . . . , K , T) = K i=1 pi

  7. Parametric Sensitivity and Calibration for Kain-Fritsch Convective Parameterization Scheme in the WRF Model

    SciTech Connect (OSTI)

    Yan, Huiping; Qian, Yun; Lin, Guang; Leung, Lai-Yung R.; Yang, Ben; Fu, Q.

    2014-03-25

    Convective parameterizations used in weather and climate models all display sensitivity to model resolution and variable skill in different climatic regimes. Although parameters in convective schemes can be calibrated using observations to reduce model errors, it is not clear if the optimal parameters calibrated based on regional data can robustly improve model skill across different model resolutions and climatic regimes. In this study, this issue is investigated using a regional modeling framework based on the Weather Research and Forecasting (WRF) model. To quantify the response and sensitivity of model performance to model parameters, we identified five key input parameters and specified their ranges in the Kain-Fritsch (KF) convection scheme in WRF and calibrated them across different spatial resolutions, climatic regimes, and radiation schemes using observed precipitation data. Results show that the optimal values for the five input parameters in the KF scheme are close and model sensitivity and error exhibit similar dependence on the input parameters for all experiments conducted in this study despite differences in the precipitation climatology. We found that the model overall performances in simulating precipitation are more sensitive to the coefficients of downdraft (Pd) and entrainment (Pe) mass flux and starting height of downdraft (Ph). However, we found that rainfall biases, which are probably more related to structural errors, still exist over some regions in the simulation even with the optimal parameters, suggesting further studies are needed to identify the sources of uncertainties and reduce the model biases or structural errors associated with missed or misrepresented physical processes and/or potential problems with the modeling framework.

  8. Implementation of Energy and Power Saving Scheme in The Avenues Mall 

    E-Print Network [OSTI]

    Al-Hadban, Y.; Maheshwari, G.; Al-Taqi, H. H.; Al-Nakib, D.; Alasseri, R.

    2010-01-01

    of Energy and Power Saving Scheme in The Avenues Mall Y. Al-Hadban, G. P. Maheshwari, H. Al-Taqi, D. Al-Nakib and R. Alasseri Department of Building and Energy Technologies Environment and Urban Development Division Kuwait Institute for Scientific... Research P.O. Box 24885, 13109, Safat, Kuwait htaqi@safat.kisr.edu.kw ABSTRACT This paper presents the results on an energy audit and subsequent implementation of energy efficient operation and maintenance strategies between April 2008 and March...

  9. Crystal field parameters and energy levels scheme of trivalent chromium doped BSO

    SciTech Connect (OSTI)

    Petkova, P.; Andreici, E.-L.; Avram, N. M.

    2014-11-24

    The aim of this paper is to give an analysis of crystal field parameters and energy levels schemes for the above doped material, in order to give a reliable explanation for experimental data. The crystal field parameters have been modeled in the frame of Exchange Charge Model (ECM) of the crystal field theory, taken into account the geometry of systems, with actually site symmetry of the impurity ions. The effect of the charges of the ligands and covalence bonding between chromium cation and oxygen anions, in the cluster approach, also were taken into account. With the obtained values of the crystal field parameters we simulated the scheme of energy levels of chromium ions by diagonalizing the matrix of the Hamiltonian of the doped crystal. The obtained energy levels and estimated Racah parameters B and C were compared with the experimental spectroscopic data and discussed. Comparison with experiment shows that the results are quite satisfactory which justify the model and simulation scheme used for the title system.

  10. Comparison among Magnus/Floquet/Fer expansion schemes in solid-state NMR

    SciTech Connect (OSTI)

    Takegoshi, K. Miyazawa, Norihiro; Sharma, Kshama; Madhu, P. K.

    2015-04-07

    We here revisit expansion schemes used in nuclear magnetic resonance (NMR) for the calculation of effective Hamiltonians and propagators, namely, Magnus, Floquet, and Fer expansions. While all the expansion schemes are powerful methods there are subtle differences among them. To understand the differences, we performed explicit calculation for heteronuclear dipolar decoupling, cross-polarization, and rotary-resonance experiments in solid-state NMR. As the propagator from the Fer expansion takes the form of a product of sub-propagators, it enables us to appreciate effects of time-evolution under Hamiltonians with different orders separately. While 0th-order average Hamiltonian is the same for the three expansion schemes with the three cases examined, there is a case that the 2nd-order term for the Magnus/Floquet expansion is different from that obtained with the Fer expansion. The difference arises due to the separation of the 0th-order term in the Fer expansion. The separation enables us to appreciate time-evolution under the 0th-order average Hamiltonian, however, for that purpose, we use a so-called left-running Fer expansion. Comparison between the left-running Fer expansion and the Magnus expansion indicates that the sign of the odd orders in Magnus may better be reversed if one would like to consider its effect in order.

  11. An analytical demonstration of coupling schemes between magnetohydrodynamic codes and eddy current codes

    SciTech Connect (OSTI)

    Liu Yueqiang [Euratom/UKAEA Fusion Association, Culham Science Centre, Abingdon OX14 3DB (United Kingdom); Albanese, R.; Rubinacci, G. [ENEA/CREATE, Universita Federico II di Napoli, Via Claudio 21, Napoli (Italy); Portone, A. [EFDA-CSU Barcelona, C/Josep Pla 2, B3, 08019 Barcelona (Spain); Villone, F. [ENEA/CREATE, DAEIMI, Universita di Cassino, Via di Biasio 43, Cassino (Italy)

    2008-07-15

    In order to model a magnetohydrodynamic (MHD) instability that strongly couples to external conducting structures (walls and/or coils) in a fusion device, it is often necessary to combine a MHD code solving for the plasma response, with an eddy current code computing the fields and currents of conductors. We present a rigorous proof of the coupling schemes between these two types of codes. One of the coupling schemes has been introduced and implemented in the CARMA code [R. Albanese, Y. Q. Liu, A. Portone, G. Rubinacci, and F. Villone, IEEE Trans. Magn. 44, 1654 (2008); A. Portone, F. Villone, Y. Q. Liu, R. Albanese, and G. Rubinacci, Plasma Phys. Controlled Fusion 50, 085004 (2008)] that couples the MHD code MARS-F[Y. Q. Liu, A. Bondeson, C. M. Fransson, B. Lennartson, and C. Breitholtz, Phys. Plasmas 7, 3681 (2000)] and the eddy current code CARIDDI[R. Albanese and G. Rubinacci, Adv. Imaging Electron Phys. 102, 1 (1998)]. While the coupling schemes are described for a general toroidal geometry, we give the analytical proof for a cylindrical plasma.

  12. A novel scheme to handle highly pulsed loads with a standard helium refrigerator

    SciTech Connect (OSTI)

    Slack, D.S.

    1993-06-30

    Helium refrigerator performance degrades rapidly when it has to handle a varying or pulsed heat load. A novel scheme is presented to handle highly pulsed 4.5 K cryogenic loads with a standard helium refrigerator by isolating it from these pulses. The scheme uses a relatively simple arrangement of control valves, heat exchangers, and a storage dewar. Applications include pulsed tokamak machines such as TPX (Tokamak Physics Experiment) and ITER (International Thermonuclear Experimental Reactor). For example, the TPX (currently in the conceptual design phase in a DoE contract) requires an average 4.5 K refrigerator capacity of about 10 kW; however, pulsed loads caused by eddy current and nuclear heating will exceed 100 kW. The scheme presented here provides a method for handling these pulsed loads. Because of the simple and proven nature of the components involved and the thermodynamic properties of the helium, the system could be implemented for projects such as TPX or ITER with little or no development.

  13. Electronic excitations from a linear-response range-separated hybrid scheme

    E-Print Network [OSTI]

    Rebolini, Elisa; Toulouse, Julien

    2013-01-01

    We study linear-response time-dependent density-functional theory (DFT) based on the single-determinant range-separated hybrid (RSH) scheme, i.e. combining a long-range Hartree-Fock exchange kernel with a short-range DFT exchange-correlation kernel, for calculating electronic excitation energies of molecular systems. It is an alternative to the long-range correction (LC) scheme which has a standard full-range DFT correlation kernel instead of only a short-range one. We discuss the local-density approximation (LDA) to the short-range exchange-correlation kernel, and assess the performance of the linear-response RSH scheme for singlet-singlet and singlet-triplet valence and Rydberg excitations in the N2, CO, H2CO, C2H4, and C6H6 molecules, and for the first charge-transfer excitation in the C2H4-C2F4 dimer. The introduction of long-range HF exchange corrects the underestimation of charge-transfer and high-lying Rydberg excitation energies obtained with standard (semi)local density-functional approximations, but...

  14. The Role of Momentum Interpolation Mechanism of the Roe Scheme in the Shock Instability

    E-Print Network [OSTI]

    Li, Xue-song

    2015-01-01

    The shock instability phenomenon is a famous problem for the shock-capturing scheme. By subdividing the numerical dissipation of the Roe scheme, the term of pressure-difference-driven modification for the cell face velocity is regarded as a version of the momentum interpolation method (MIM), which is necessary for incompressible flows to suppress the pressure checkerboard problem. Through the analysis and odd-even decoupling test, it is discovered that MIM plays the most important role on the shock instability. In fact, for non-linear flows MIM should be completely removed, but unexpected MIM is activated on the cell face nearly parallel to the flow for high Mach number flows or low Mach number flows in shock. For such conditions, two coefficients are designed based on local Mach number and a shock detector, respectively, and then the improved Roe scheme is proposed, which gives consideration to requirement of MIM for incompressible and compressible flows and is validated for good performance of avoiding odd-...

  15. The stability of spectroscopic instruments: A unified Allan variance computation scheme

    E-Print Network [OSTI]

    Volker Ossenkopf

    2007-12-28

    The Allan variance is a standard technique to characterise the stability of spectroscopic instruments used in astronomical observations. The period for switching between source and reference measurement is often derived from the Allan minimum time. We propose a new approach for the computation of the Allan variance of spectrometer data combining the advantages of the two existing methods into a unified scheme. Using the Allan variance spectrum we derive the optimum strategy for symmetric observing schemes minimising the total uncertainty of the data resulting from radiometric and drift noise. The unified Allan variance computation scheme is designed to trace total-power and spectroscopic fluctuations within the same framework. The method includes an explicit error estimate both for the individual Allan variance spectra and for the derived stability time. A new definition of the instrument stability time allows to characterise the instrument even in the case of a fluctuation spectrum shallower than 1/f, as measured for the total power fluctuations in high-electron-mobility transistors. We find a non-linear impact of the binning of spectrometer channels on the resulting noise and the Allan time deviating from the description in existing theoretical treatments.

  16. An Efficient Molecular Dynamics Scheme for Predicting Dopant Implant Profiles in Semiconductors

    SciTech Connect (OSTI)

    Beardmore, K.M.; Gronbech-Jensen, N.

    1998-09-15

    The authors present a highly efficient molecular dynamics scheme for calculating the concentration profile of dopants implanted in group-IV alloy, and III-V zinc blende structure materials. The program incorporates methods for reducing computational overhead, plus a rare event algorithm to give statistical accuracy over several orders of magnitude change in the dopant concentration. The code uses a molecular dynamics (MD) model, instead of the binary collision approximation (BCA) used in implant simulators such as TRIM and Marlowe, to describe ion-target interactions. Atomic interactions are described by a combination of 'many-body' and screened Coulomb potentials. Inelastic energy loss is accounted for using a Firsov model, and electronic stopping is described by a Brandt-Kitagawa model which contains the single adjustable parameter for the entire scheme. Thus, the program is easily extensible to new ion-target combinations with the minimum of tuning, and is predictive over a wide range of implant energies and angles. The scheme is especially suited for calculating profiles due to low energy, large angle implants, and for situations where a predictive capability is required with the minimum of experimental validation. They give examples of using their code to calculate concentration profiles and 2D 'point response' profiles of dopants in crystalline silicon, silicon-germanium blends, and gallium-arsenide. They can predict the experimental profiles over five orders of magnitude for <100> and <110> channeling and for non-channeling implants at energies up to hundreds of keV.

  17. Les dterminants du prix du carbone sur le march europen des quotas Carbon price drivers in the EU Emissions Trading Scheme

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    in the EU Emissions Trading Scheme Emilie Alberola1 et Julien Chevallier2 Résumé: L'article examine le prix des quotas durant la première période (2005-2007) de l'European Union Emissions Trading Scheme (EU

  18. Magnetized color superconducting cold quark matter within the SU(2)$_f$ NJL model: a novel regularization scheme

    E-Print Network [OSTI]

    Allen, Pablo G; Scoccola, Norberto N

    2015-01-01

    The influence of intense magnetic fields on the behavior of color superconducting cold quark matter is investigated using an SU(2)$_f$ NJL-type model for which a novel regulation scheme is introduced. In such a scheme the contributions which are explicitly dependent on the magnetic field turn out to be finite and, thus, do not require to be regularized. As a result of this, nonphysical oscillations that might arise in the alternative regularization schemes previously used in the literature are naturally removed. The sensitivity of our results to the model parametrization is analyzed.

  19. Magnetized color superconducting cold quark matter within the SU(2)$_f$ NJL model: a novel regularization scheme

    E-Print Network [OSTI]

    Pablo G. Allen; Ana G. Grunfeld; Norberto N. Scoccola

    2015-10-08

    The influence of intense magnetic fields on the behavior of color superconducting cold quark matter is investigated using an SU(2)$_f$ NJL-type model for which a novel regulation scheme is introduced. In such a scheme the contributions which are explicitly dependent on the magnetic field turn out to be finite and, thus, do not require to be regularized. As a result of this, nonphysical oscillations that might arise in the alternative regularization schemes previously used in the literature are naturally removed. The sensitivity of our results to the model parametrization is analyzed.

  20. A Survey of Sensor Selection Schemes in Wireless Sensor Hosam Rowaihy1, Sharanya Eswaran1, Matthew Johnson2, Dinesh Verma3, Amotz Bar-Noy2,

    E-Print Network [OSTI]

    La Porta, Tom

    sensors should be kept to a minimum. To resolve this conflict of interest, sensor selection schemesA Survey of Sensor Selection Schemes in Wireless Sensor Networks Hosam Rowaihy1, Sharanya Eswaran1 are used. In this paper, we survey different schemes that are used to select sensors. Based on the purpose

  1. Correct mutual information, quantum bit error rate and secure transmission efficiency in Wojcik's eavesdropping scheme on ping-pong protocol

    E-Print Network [OSTI]

    Zhanjun Zhang

    2004-02-16

    The wrong mutual information, quantum bit error rate and secure transmission efficiency in Wojcik's eavesdropping scheme [PRL90(03)157901]on ping-pong protocol have been pointed out and corrected.

  2. Over-Allocation or Abatement? A Preliminary Analysis of the EU Emissions Trading Scheme Based on the 2005 Emissions Data

    E-Print Network [OSTI]

    Ellerman, A. Denny.

    This paper provides an initial analysis of the European Union Emissions Trading Scheme (EU ETS) based on the installation-level data for verified emissions and allowance allocations in the first trading year. Those data, ...

  3. From presentation discussions Thursday, April 29, 2010 Why do environmental groups oppose mercury cap and trade schemes?

    E-Print Network [OSTI]

    Toohey, Darin W.

    -and-trade system is the best way to limit sulfur dioxide (acid rain) and greenhouse gases because they cap and trade schemes? Do particles cool or warm the climate? Haze and fires Sulfur scrubbers #12;EPA

  4. APPLICATION PROCEDURES FOR CHINESE GOVERNMENT SCHOLARSHIP Chinese Government Scholarship scheme is established by the Ministry of Education of China

    E-Print Network [OSTI]

    Ziegler, Günter M.

    APPLICATION PROCEDURES FOR CHINESE GOVERNMENT SCHOLARSHIP Chinese Government Scholarship scheme with educational exchange agreements or understandings reached between Chinese government and governments of other and carry out the routine management of Chinese Government Scholarship Programs. Categories of Applicants

  5. Universal Padding Schemes for RSA Jean-S ebastien Coron, Marc Joye, David Naccache, and Pascal Paillier

    E-Print Network [OSTI]

    International Association for Cryptologic Research (IACR)

    Universal Padding Schemes for RSA Jean-S#19;ebastien Coron, Marc Joye, David Naccache, and Pascal-sebastien.coron, marc.joye, david.naccache, pascal.paillierg@gemplus.com Abstract. A common practice to encrypt with RSA

  6. A New Approach to Mitigate the Impact of Distributed Generation on the Overcurrent Protection Scheme of Radial Distribution Feeders 

    E-Print Network [OSTI]

    Funmilayo, Hamed

    2010-01-14

    Increased Distributed Generation (DG) presence on radial distribution feeders is becoming a common trend. The existing Overcurrent Protection (OCP) scheme on such feeders consists mainly of overcurrent protection devices ...

  7. Effects of mineral aerosols on the summertime climate of southwest Asia: Incorporating subgrid variability in a dust emission scheme

    E-Print Network [OSTI]

    Marcella, Marc Pace

    [1] Improvements in modeling mineral aerosols over southwest Asia are made to the dust scheme in a regional climate model by representing subgrid variability of both wind speed and surface roughness length. The new module ...

  8. Study of full implicit petroleum engineering finite volume scheme for compressible two phase flow in porous media

    E-Print Network [OSTI]

    Saad, Bilal

    2012-01-01

    An industrial scheme, to simulate the two compressible phase flow in porous media, consists in a finite volume method together with a phase-by-phase upstream scheme. The implicit finite volume scheme satisfies industrial constraints of robustness. We show that the proposed scheme satisfy the maximum principle for the saturation, a discrete energy estimate on the pressures and a function of the saturation that denote capillary terms. These stabilities results allow us to derive the convergence of a subsequence to a weak solution of the continuous equations as the size of the discretization tends to zero. The proof is given for the complete system when the density of the each phase depends on the own pressure.

  9. Execution Schemes for Dynamically Reconfigurable Architectures T. Oppold, T. Schweizer, J. Oliveira Filho, S. Eisenhardt, T. Kuhn, W. Rosenstiel

    E-Print Network [OSTI]

    Ould Ahmedou, Mohameden

    estimations derived from a synthesized architecture model. I. Introduction Surveys of reconfigurable computing architecture prototypes. II. Related Work Various projects deal with the development of either domainExecution Schemes for Dynamically Reconfigurable Architectures T. Oppold, T. Schweizer, J. Oliveira

  10. A Rotary PIN Entry Scheme Resilient to Shoulder-Surfing Peipei Shi, Bo Zhu and Amr Youssef

    E-Print Network [OSTI]

    Youssef, Amr M.

    A Rotary PIN Entry Scheme Resilient to Shoulder-Surfing Peipei Shi, Bo Zhu and Amr Youssef Concordia Institute for Information Systems Engineering Concordia University, Montreal, Quebec, Canada {pe

  11. A symmetry reduction scheme of the Dirac algebra without dimensional defects

    SciTech Connect (OSTI)

    Dahm, R.

    2010-02-15

    In relating the Dirac algebra to homogeneous coordinates of a projective geometry, we present a simple geometric scheme which allows to identify various Lie algebras and Lie groups well-known from classical physics as well as from quantum field theory. We introduce a 1 -point-compactification and quaternionic Moebius transformations, and we use SU* (4) and a symmetry reduction scheme without dimensional defects to identify transformations and particle representations thoroughly. As such, two subsequent nonlinear {sigma} models SU*(4)/U Sp(4) and U Sp(4)/SU(2) x U(1) emerge as well as a possible double coset decomposition of SU*(4) with respect to SU(2) x U(1). Whereas the first model leads to equivalence classes of hyperbolic manifolds and naturally introduces coordinates and velocities, the second coset model leads to a Hermitian symmetric (vector) space (Kaehlerian space) of real dimension 6, i.e., to a 3-dimensional complex space with a global symplectic and a local SU(2) x U(1) symmetry which allows to identify the (local) gauge group of electroweak interactions as well as under certain assumptions it admits compact SU(3) transformations as automorphisms of this 3-dimensional (hyper)complex vector space. In the limit of low energies, this geometric SU*(4) scheme naturally yields the (compact) group SU(4) to describe 'chiral symmetry' and conserved isospin of hadrons as well as the low-dimensional hadron representations. Last not least, with respect to some of the SU*(4) generators we find a multiplication table which (up to signs) is identical with the octonions represented in the Fano plane.

  12. Performance and Error Analysis of Knill's Postselection Scheme in a Two-Dimensional Architecture

    E-Print Network [OSTI]

    Ching-Yi Lai; Gerardo Paz; Martin Suchara; Todd A. Brun

    2013-05-31

    Knill demonstrated a fault-tolerant quantum computation scheme based on concatenated error-detecting codes and postselection with a simulated error threshold of 3% over the depolarizing channel. %We design a two-dimensional architecture for fault-tolerant quantum computation based on Knill's postselection scheme. We show how to use Knill's postselection scheme in a practical two-dimensional quantum architecture that we designed with the goal to optimize the error correction properties, while satisfying important architectural constraints. In our 2D architecture, one logical qubit is embedded in a tile consisting of $5\\times 5$ physical qubits. The movement of these qubits is modeled as noisy SWAP gates and the only physical operations that are allowed are local one- and two-qubit gates. We evaluate the practical properties of our design, such as its error threshold, and compare it to the concatenated Bacon-Shor code and the concatenated Steane code. Assuming that all gates have the same error rates, we obtain a threshold of $3.06\\times 10^{-4}$ in a local adversarial stochastic noise model, which is the highest known error threshold for concatenated codes in 2D. We also present a Monte Carlo simulation of the 2D architecture with depolarizing noise and we calculate a pseudo-threshold of about 0.1%. With memory error rates one-tenth of the worst gate error rates, the threshold for the adversarial noise model, and the pseudo-threshold over depolarizing noise, are $4.06\\times 10^{-4}$ and 0.2%, respectively. In a hypothetical technology where memory error rates are negligible, these thresholds can be further increased by shrinking the tiles into a $4\\times 4$ layout.

  13. Implicit and explicit schemes for mass consistency preservation in hybrid particle/finite-volume algorithms for turbulent reactive flows

    SciTech Connect (OSTI)

    Popov, Pavel P., E-mail: ppopov@uci.edu; Pope, Stephen B.

    2014-01-15

    This work addresses the issue of particle mass consistency in Large Eddy Simulation/Probability Density Function (LES/PDF) methods for turbulent reactive flows. Numerical schemes for the implicit and explicit enforcement of particle mass consistency (PMC) are introduced, and their performance is examined in a representative LES/PDF application, namely the Sandia–Sydney Bluff-Body flame HM1. A new combination of interpolation schemes for velocity and scalar fields is found to better satisfy PMC than multilinear and fourth-order Lagrangian interpolation. A second-order accurate time-stepping scheme for stochastic differential equations (SDE) is found to improve PMC relative to Euler time stepping, which is the first time that a second-order scheme is found to be beneficial, when compared to a first-order scheme, in an LES/PDF application. An explicit corrective velocity scheme for PMC enforcement is introduced, and its parameters optimized to enforce a specified PMC criterion with minimal corrective velocity magnitudes.

  14. Second order symmetry-preserving conservative Lagrangian scheme for compressible Euler equations in two-dimensional cylindrical coordinates

    SciTech Connect (OSTI)

    Cheng, Juan, E-mail: cheng_juan@iapcm.ac.cn [Institute of Applied Physics and Computational Mathematics, Beijing 100094 (China); Shu, Chi-Wang, E-mail: shu@dam.brown.edu [Division of Applied Mathematics, Brown University, Providence, RI 02912 (United States)

    2014-09-01

    In applications such as astrophysics and inertial confinement fusion, there are many three-dimensional cylindrical-symmetric multi-material problems which are usually simulated by Lagrangian schemes in the two-dimensional cylindrical coordinates. For this type of simulation, a critical issue for the schemes is to keep spherical symmetry in the cylindrical coordinate system if the original physical problem has this symmetry. In the past decades, several Lagrangian schemes with such symmetry property have been developed, but all of them are only first order accurate. In this paper, we develop a second order cell-centered Lagrangian scheme for solving compressible Euler equations in cylindrical coordinates, based on the control volume discretizations, which is designed to have uniformly second order accuracy and capability to preserve one-dimensional spherical symmetry in a two-dimensional cylindrical geometry when computed on an equal-angle-zoned initial grid. The scheme maintains several good properties such as conservation for mass, momentum and total energy, and the geometric conservation law. Several two-dimensional numerical examples in cylindrical coordinates are presented to demonstrate the good performance of the scheme in terms of accuracy, symmetry, non-oscillation and robustness. The advantage of higher order accuracy is demonstrated in these examples.

  15. Application of direct pulsewidth modulation scheme to AC-DC converters: - a way to reduce ripple 

    E-Print Network [OSTI]

    Zhang, Yuemin

    1993-01-01

    the wanted output voltage. Reference [14] proposed three schemes: Sr(~t) is 9 pulses per half cycle, Ss(~t) is 7 pulses per half cycle, and Ss(wt) is just I pulse per half cycle. Then author reached the conclusion that Sr(ut) is the best choice. Reference... in Figure 4. B. ) is given as r t's Sr = J V~sin~tdt &a 1. 17 V (cos wt~ ? cos cdts) According to the principle of DPWM, Sr should be equal to Sr. Then Vm VELDT = ? (cos at~ ? cos its) 1. 18 Since we only have one equation(Eq. 1. 18) and two unknowns...

  16. Time-dependent Internal DFT formalism and Kohn-Sham scheme

    E-Print Network [OSTI]

    J. Messud

    2009-11-05

    We generalize to the time-dependent case the stationary Internal DFT / Kohn-Sham formalism presented in Ref. [14]. We prove that, in the time-dependent case, the internal properties of a self-bound system (as an atomic nuclei) are all defined by the internal one-body density and the initial state. We set-up a time-dependent Internal Kohn-Sham scheme as a practical way to compute the internal density. The main difference with the traditional DFT / Kohn-Sham formalism is the inclusion of the center-of-mass correlations in the functional.

  17. Complex absorbing potential based Lorentzian fitting scheme and time dependent quantum transport

    SciTech Connect (OSTI)

    Xie, Hang Kwok, Yanho; Chen, GuanHua; Jiang, Feng; Zheng, Xiao

    2014-10-28

    Based on the complex absorbing potential (CAP) method, a Lorentzian expansion scheme is developed to express the self-energy. The CAP-based Lorentzian expansion of self-energy is employed to solve efficiently the Liouville-von Neumann equation of one-electron density matrix. The resulting method is applicable for both tight-binding and first-principles models and is used to simulate the transient currents through graphene nanoribbons and a benzene molecule sandwiched between two carbon-atom chains.

  18. PTFE treatment by remote atmospheric Ar/O2 plasmas: a simple reaction scheme model proposal

    E-Print Network [OSTI]

    Carbone, E A D; Keuning, W; van der Mullen, J J A M

    2013-01-01

    Polytetrafluoroethylene (PTFE) samples were treated by a remote atmospheric pressure microwave plasma torch and analyzed by water contact angle (WCA) and X-ray photoelectron spectroscopy (XPS). In the case of pure argon plasma a decrease of WCA is observed meanwhile an increase of hydrophobicity was observed when some oxygen was added to the discharge. The WCA results are correlated to XPS of reference samples and the change of WCA are attributed to changes in roughness of the samples. A simple kinetics scheme for the chemistry on the PTFE surface is proposed to explain the results.

  19. High Performance 400 Gigabit Ethernet Links using Hybrid Multiband CAP/QAM Scheme

    E-Print Network [OSTI]

    Wei, J. L.; Cheng, Q.; Cunningham, D. G.; Penty, R. V.; White, I. H.; Griesser, H.

    2015-03-26

    . In this paper, for the first time, we propose the combination of a hybrid multiband CAP transmitter [5] and a modified QAM receiver [9] scheme for 400 Gigabit Ethernet links. Both DML and EML based SMF links are analyzed. Results show that the proposed... digital implementation is considered. The resulting signal spectrum is shown in in-sets (a) and (b) of Fig. 1 (note two different roll-off coefficients of 0.5 for (a) and 1 for (b) for the SRRC filters are displayed). Power loading is adopted so...

  20. Tank waste remediation system optimized processing strategy with an altered treatment scheme

    SciTech Connect (OSTI)

    Slaathaug, E.J.

    1996-03-01

    This report provides an alternative strategy evolved from the current Hanford Site Tank Waste Remediation System (TWRS) programmatic baseline for accomplishing the treatment and disposal of the Hanford Site tank wastes. This optimized processing strategy with an altered treatment scheme performs the major elements of the TWRS Program, but modifies the deployment of selected treatment technologies to reduce the program cost. The present program for development of waste retrieval, pretreatment, and vitrification technologies continues, but the optimized processing strategy reuses a single facility to accomplish the separations/low-activity waste (LAW) vitrification and the high-level waste (HLW) vitrification processes sequentially, thereby eliminating the need for a separate HLW vitrification facility.

  1. Inclusive B-Meson Production at the LHC in the GM-VFN Scheme

    E-Print Network [OSTI]

    B. A. Kniehl; G. Kramer; I. Schienbein; H. Spiesberger

    2011-10-28

    We calculate the next-to-leading-order cross section for the inclusive production of B mesons in pp collisions in the general-mass variable-flavor-number scheme, an approach which takes into account the finite mass of the b quarks. We use realistic evolved non-perturbative fragmentation functions obtained from fits to e+e- data and compare results for the transverse-momentum and rapidity distributions at a center-of-mass energy of 7 TeV with recent data from the CMS Collaboration. We find good agreement, in particular at large values of pT.

  2. A general hybrid radiation transport scheme for star formation simulations on an adaptive grid

    SciTech Connect (OSTI)

    Klassen, Mikhail; Pudritz, Ralph E. [Department of Physics and Astronomy, McMaster University 1280 Main Street W, Hamilton, ON L8S 4M1 (Canada); Kuiper, Rolf [Max Planck Institute for Astronomy Königstuhl 17, D-69117 Heidelberg (Germany); Peters, Thomas [Institut für Computergestützte Wissenschaften, Universität Zürich Winterthurerstrasse 190, CH-8057 Zürich (Switzerland); Banerjee, Robi; Buntemeyer, Lars, E-mail: klassm@mcmaster.ca [Hamburger Sternwarte, Universität Hamburg Gojenbergsweg 112, D-21029 Hamburg (Germany)

    2014-12-10

    Radiation feedback plays a crucial role in the process of star formation. In order to simulate the thermodynamic evolution of disks, filaments, and the molecular gas surrounding clusters of young stars, we require an efficient and accurate method for solving the radiation transfer problem. We describe the implementation of a hybrid radiation transport scheme in the adaptive grid-based FLASH general magnetohydrodyanmics code. The hybrid scheme splits the radiative transport problem into a raytracing step and a diffusion step. The raytracer captures the first absorption event, as stars irradiate their environments, while the evolution of the diffuse component of the radiation field is handled by a flux-limited diffusion solver. We demonstrate the accuracy of our method through a variety of benchmark tests including the irradiation of a static disk, subcritical and supercritical radiative shocks, and thermal energy equilibration. We also demonstrate the capability of our method for casting shadows and calculating gas and dust temperatures in the presence of multiple stellar sources. Our method enables radiation-hydrodynamic studies of young stellar objects, protostellar disks, and clustered star formation in magnetized, filamentary environments.

  3. A Comparative Study of Different Reconstruction Schemes for a Reconstructed Discontinuous Galerkin Method on Arbitrary Grids

    SciTech Connect (OSTI)

    Hong Luo; Hanping Xiao; Robert Nourgaliev; Chunpei Cai

    2011-06-01

    A comparative study of different reconstruction schemes for a reconstruction-based discontinuous Galerkin, termed RDG(P1P2) method is performed for compressible flow problems on arbitrary grids. The RDG method is designed to enhance the accuracy of the discontinuous Galerkin method by increasing the order of the underlying polynomial solution via a reconstruction scheme commonly used in the finite volume method. Both Green-Gauss and least-squares reconstruction methods and a least-squares recovery method are implemented to obtain a quadratic polynomial representation of the underlying discontinuous Galerkin linear polynomial solution on each cell. These three reconstruction/recovery methods are compared for a variety of compressible flow problems on arbitrary meshes to access their accuracy and robustness. The numerical results demonstrate that all three reconstruction methods can significantly improve the accuracy of the underlying second-order DG method, although the least-squares reconstruction method provides the best performance in terms of both accuracy and robustness.

  4. Optimization of the Combined Proton Acceleration Regime with a Target Composition Scheme

    E-Print Network [OSTI]

    Yao, W P; Zheng, C Y; Liu, Z J; Yan, X Q

    2015-01-01

    A target composition scheme to optimize the combined proton acceleration regime is presented and verified by two-dimensional particle-in-cell (2D PIC) simulations by using an ultra-intense circularly-polarized (CP) laser pulse irradiating an overdense hydrocarbon (CH) target, instead of a pure hydrogen (H) one. The combined acceleration regime is a two-stage proton acceleration scheme combining the radiation pressure dominated acceleration (RPDA) stage and the laser wakefield acceleration (LWFA) stage sequentially together. With an ultra-intense CP laser pulse irradiating an overdense CH target, followed by an underdense tritium plasma gas, protons with higher energies (from about $20$ GeV up to about $30$ GeV) and lower energy spreads (from about $18\\%$ down to about $5\\%$ in full-width at half-maximum, or FWHM) are generated, as compared to the use of a pure H target. It is because protons can be more stably pre-accelerated in the first RPDA stage when using CH targets. With the increase of the carbon-to-hy...

  5. A New Hybrid Scheme for Simulations of Highly Collisional RF-Driven Plasmas

    E-Print Network [OSTI]

    Eremin, Denis; Mussenbrock, Thomas

    2015-01-01

    This work describes a new 1D hybrid approach for modeling atmospheric pressure discharges featuring complex chemistry. In this approach electrons are described fully kinetically using Particle-In-Cell/Monte-Carlo (PIC/MCC) scheme, whereas the heavy species are modeled within a fluid description. Validity of the popular drift-diffusion approximation is verified against a "full" fluid model accounting for the ion inertia and a fully kinetic PIC/MCC code for ions as well as electrons. The fluid models require knowledge of the momentum exchange frequency and dependence of the ion mobilities on the electric field when the ions are in equilibrium with the latter. To this end an auxiliary Monte-Carlo scheme is constructed. It is demonstrated that the drift-diffusion approximation can overestimate ion transport in simulations of RF-driven discharges with heavy ion species operated in the $\\gamma$ mode at the atmospheric pressure or in all discharge simulations for lower pressures. This can lead to exaggerated plasma ...

  6. Low-diffusivity scalar transport using a WENO scheme and dual meshing

    E-Print Network [OSTI]

    Boris Kubrak; Jan Wissink; Herlina Herlina; Friedrich Greve

    2013-02-02

    Interfacial mass transfer of low-diffusive substances in an unsteady flow environment is marked by a very thin boundary layer at the interface and other regions with steep concentration gradients. A numerical scheme capable of resolving accurately most details of this process is presented. In this scheme, the fourth-order accurate WENO method developed by Liu et al. (1994) was implemented on a non-uniform staggered mesh to discretize the scalar convection while for the scalar diffusion a fourth-order accurate central discretization was employed. The discretization of the scalar convection-diffusion equation was combined with a fourth-order Navier-Stokes solver which solves the incompressible flow. A dual meshing strategy was employed, in which the scalar was solved on a finer mesh than the incompressible flow. The solver was tested by performing a number of two-dimensional simulations of an unstably stratified flow with low diffusivity scalar transport. The unstable stratification led to buoyant convection which was modelled using a Boussinesq approximation with a linear relationship between flow temperature and density. The order of accuracy for one-dimensional scalar transport on a stretched and uniform grid was also tested. The results show that for the method presented above a relatively coarse mesh is sufficient to accurately describe the fluid flow, while the use of a refined mesh for the low-diffusive scalars is found to be beneficial in order to obtain a highly accurate resolution with negligible numerical diffusion.

  7. Deterministic multivalued logic scheme for information processing and routing in the brain

    E-Print Network [OSTI]

    S. M. Bezrukov; L. B. Kish

    2009-05-06

    Driven by analogies with state vectors of quantum informatics and noise-based logic, we propose a general scheme and elements of neural circuitry for processing and addressing information in the brain. Specifically, we consider random (e.g., Poissonian) trains of finite-duration spikes, and, using the idealized concepts of excitatory and inhibitory synapses, offer a procedure for generating 2^N-1 orthogonal vectors out of N partially overlapping trains ("neuro-bits"). We then show that these vectors can be used to construct 2^(2^N-1)-1 different superpositions which represent the same number of logic values when carrying or routing information. In quantum informatics the above numbers are the same, however, the present logic scheme is more advantageous because it is deterministic in the sense that the presence of a vector in the spike train is detected by an appropriate coincidence circuit. For this reason it does not require time averaging or repeated measurements of the kind used in standard cross-correlation analysis or in quantum computing.

  8. The terminator "toy" chemistry test: A simple tool to assess errors in transport schemes

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

    Lauritzen, P. H.; Conley, A. J.; Lamarque, J. -F.; Vitt, F.; Taylor, M. A.

    2015-05-04

    This test extends the evaluation of transport schemes from prescribed advection of inert scalars to reactive species. The test consists of transporting two interacting chemical species in the Nair and Lauritzen 2-D idealized flow field. The sources and sinks for these two species are given by a simple, but non-linear, "toy" chemistry that represents combination (X+X ? X2) and dissociation (X2 ? X+X). This chemistry mimics photolysis-driven conditions near the solar terminator, where strong gradients in the spatial distribution of the species develop near its edge. Despite the large spatial variations in each species, the weighted sum XT = X+2X2more »should always be preserved at spatial scales at which molecular diffusion is excluded. The terminator test demonstrates how well the advection–transport scheme preserves linear correlations. Chemistry–transport (physics–dynamics) coupling can also be studied with this test. Examples of the consequences of this test are shown for illustration.« less

  9. Linear accelerator design study with direct plasma injection scheme for warm dense matter

    SciTech Connect (OSTI)

    Kondo, K.; Kanesue, T; Okamura, M.

    2011-03-28

    Warm Dense Matter (WDM) is a challenging science field, which is related to heavy ion inertial fusion and planetary science. It is difficult to expect the behavior because the state with high density and low temperature is completely different from ideal condition. The well-defined WDM generation is required to understand it. Moderate energy ion beams ({approx} MeV/u) slightly above Bragg peak is an advantageous method for WDM because of the uniform energy deposition. Direct Plasma Injection Scheme (DPIS) with a Interdigital H-mode (IH) accelerator has a potential for the beam parameter. We show feasible parameters of the IH accelerator for WDM. WDM physics is a challenging science and is strongly related to Heavy Ion Fusion science. WDM formation by Direct Plasma Injection Scheme (DPIS) with IH accelerator, which is a compact system, is proposed. Feasible parameters for IH accelerator are shown for WDM state. These represents that DPIS with IH accelerator can access a different parameter region of WDM.

  10. Community wind power ownership schemes in Europe and their relevance to the United States

    SciTech Connect (OSTI)

    Bolinger, Mark

    2001-05-15

    With varying success, the United States and Europe have followed a more or less parallel path of policies to support wind development over the past twenty years. Feed-in laws and tax incentives first popularized in California in the early 1980s and greatly expanded upon in Europe during the 1990s are gradually giving way to market-based support mechanisms such as renewable portfolio standards, which are being implemented in one form or another in ten US states and at least three European nations. At the same time, electricity markets are being liberalized in both the US and Europe, and many electricity consumers are being given the choice to support the development of renewable energy through higher tariffs, both in traditionally regulated and newly competitive markets. One notable area in which wind development in Europe and United States has not evolved in common, however, is with respect to the level of community ownership of wind turbines or clusters. While community ownership of wind projects is unheard of in the United States, in Europe, local wind cooperatives or other participatory business schemes have been responsible for a large share of total wind development. In Denmark, for example, approximately 80% of all wind turbines are either individually or cooperatively owned, and a similar pattern holds in Germany, the world leader in installed wind capacity. Sweden also has a strong wind cooperative base, and the UK has recently made forays into community wind ownership. Why is it that wind development has evolved this way in Europe, but not in the United States? What incremental effect have community-owned wind schemes had on European wind development? Have community-owned wind schemes driven development in Europe, or are they merely a vehicle through which the fundamental driving institutions have been channeled? Is there value to having community wind ownership in the US? Is there reason to believe that such schemes would succeed in the US? If so, which model seems most appropriate, and what barriers--legal, regulatory, tax, market, or investment--stand in the way of implementing such a scheme? These are the questions this report seeks to address. The report begins with a discussion of the relative advantages and disadvantages of community wind ownership, as opposed to the large commercially-owned projects that have so far dominated US wind development. Next, four detailed case studies relate community-owned wind experience in Denmark, Sweden, the UK, Germany, focusing primarily on the different participatory models employed in each country. The report then categorizes the various models into three main groupings--community-led, developer-led, and investment funds--and draws general conclusions about the success of each category in Europe, and the conditions that dictate the effective use of one approach over another. Finally, the focus shifts to the US, where the report discusses the domestic barriers facing each model category, and identifies the category offering the most value with the fewest barriers to implementation. The report concludes with a high-level introduction to potential applications for community wind ownership within the United States.

  11. Water Resources In Nepal: Institutional Analysis Based On Legal Provisions

    E-Print Network [OSTI]

    Magar, Shyamu Thapa

    2005-01-01

    . There are no institutional arrangements at Indrawati river basin level to cope up with multiple use of water except WUA. With the help of some extemal agency, some systems are used such as mini­ hydropower agreement with the system of Irrigation, Water Turbine and saw mill...

  12. Introduction Approximately 40% of rural Ethiopia (WaterAid, 2010)

    E-Print Network [OSTI]

    be preferred because of their low running and maintenance costs. Experience with the use of solar energy for and try other sources of renewable energy such as solar, wind, and mini-hydropower. Although limited as energy source for water supply and learning from them will help to understand the advantages

  13. FATAL+: A Self-Stabilizing Byzantine Fault-tolerant Clocking Scheme for SoCs

    E-Print Network [OSTI]

    Dolev, Danny; Lenzen, Christoph; Posch, Markus; Schmid, Ulrich; Steininger, Andreas

    2012-01-01

    We present concept and implementation of a self-stabilizing Byzantine fault-tolerant distributed clock generation scheme for multi-synchronous GALS architectures in critical applications. It combines a variant of a recently introduced self-stabilizing algorithm for generating low-frequency, low-accuracy synchronized pulses with a simple non-stabilizing high-frequency, high-accuracy clock synchronization algorithm. We provide thorough correctness proofs and a performance analysis, which use methods from fault-tolerant distributed computing research but also addresses hardware-related issues like metastability. The algorithm, which consists of several concurrent communicating asynchronous state machines, has been implemented in VHDL using Petrify in conjunction with some extensions, and synthetisized for an Altera Cyclone FPGA. An experimental validation of this prototype has been carried out to confirm the skew and clock frequency bounds predicted by the theoretical analysis, as well as the very short stabiliz...

  14. A gas kinetic scheme for the Baer-Nunziato two-phase flow model

    SciTech Connect (OSTI)

    Pan, Liang, E-mail: panliangjlu@sina.com [Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China) [Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China); The Graduate School of China Academy of Engineering Physics, Beijing 100088 (China); Zhao, Guiping, E-mail: zhaogp@nsfc.gov.cn [National Natural Science Foundation of China, Beijing 100085 (China)] [National Natural Science Foundation of China, Beijing 100085 (China); Tian, Baolin, E-mail: tian_baolin@iapcm.ac.cn [Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China) [Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China); Key Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China); Wang, Shuanghu, E-mail: wang_shuanghu@iapcm.ac.cn [Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China) [Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China); Key Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088 (China)

    2012-09-15

    Numerical methods for the Baer-Nunziato (BN) two-phase flow model have attracted much attention in recent years. In this paper, we present a new gas kinetic scheme for the BN two-phase flow model containing non-conservative terms in the framework of finite volume method. In the view of microscopic aspect, a generalized Bhatnagar-Gross-Krook (BGK) model which matches with the BN model is constructed. Based on the integral solution of the generalized BGK model, we construct the distribution functions at the cell interface. Then numerical fluxes can be obtained by taking moments of the distribution functions, and non-conservative terms are explicitly introduced into the construction of numerical fluxes. In this method, not only the complex iterative process of exact solutions is avoided, but also the non-conservative terms included in the equation can be handled well.

  15. A high carrier injection terahertz quantum cascade laser based on indirectly pumped scheme

    SciTech Connect (OSTI)

    Razavipour, S. G. Xu, C.; Wasilewski, Z. R.; Ban, D.; Dupont, E.; Laframboise, S. R.; Chan, C. W. I.; Hu, Q.

    2014-01-27

    A Terahertz quantum cascade laser with a rather high injection coupling strength based on an indirectly pumped scheme is designed and experimentally implemented. To effectively suppress leakage current, the chosen quantum cascade module of the device is based on a five-well GaAs/Al{sub 0.25}Ga{sub 0.75}As structure. The device lases up to 151?K with a lasing frequency of 2.67 THz. This study shows that the effect of higher energy states in carrier transport and the long-range tunnel coupling between states that belong to non-neighbouring modules have to be considered in quantum design of structures with a narrow injector barrier. Moreover, the effect of interface roughness scattering between the lasing states on threshold current is crucial.

  16. A new ignition scheme using hybrid indirect-direct drive for inertial confinement fusion

    E-Print Network [OSTI]

    Fan, Zhengfeng; Dai, Zhensheng; Cai, Hong-bo; Zhu, Shao-ping; Zhang, W Y; He, X T

    2013-01-01

    A new hybrid indirect-direct-drive ignition scheme is proposed for inertial confinement fusion: a cryogenic capsule encased in a hohlraum is first compressed symmetrically by indirect-drive x-rays, and then accelerated and ignited by both direct-drive lasers and x-rays. A steady high-density plateau newly formed between the radiation and electron ablation fronts suppresses the rarefaction at the radiation ablation front and greatly enhances the drive pressure. Meanwhile, multiple shock reflections at the fuel/hot-spot interface are prevented during capsule deceleration. Thus rapid ignition and burn are realized. In comparison with the conventional indirect drive, the hybrid drive implodes the capsule with a higher velocity ($\\sim4.3\\times10^7$ cm/s) and a much lower convergence ratio ($\\sim$25), and the growth of hydrodynamic instabilities is significantly reduced, especially at the fuel/hot-spot interface.

  17. Extending PIC schemes for the study of physics in ultra-strong laser fields

    E-Print Network [OSTI]

    Gonoskov, A; Efimenko, E; Ilderton, A; Marklund, M; Meyerov, I; Muraviev, A; Surmin, I; Wallin, E

    2014-01-01

    Progress in laser technology has opened up possibilities using intense light to probe fundamental physics of ultra-strong electromagnetic fields. A commensurate interest has arisen in large-scale numerical simulations of laser-matter interactions, and here we describe the extension of particle-in-cell (PIC) schemes to account for strong field phenomena. We describe here the numerical implementation of strong-field processes such as quantized emission and electron-positron pair production, and provide solutions for related methodological and algorithmic problems of radiation double counting, low-energy cutoffs in particle emission, memory overload due to cascades of particle production, control of computational costs for statistical routines, and the limitations on time steps due to the quantized nature of emission. We also present a unified technical interface for including the processes of interest in different PIC implementations. The PIC codes PICADOR and ELMIS, which support this interface, are briefly re...

  18. Interaction region for crab waist scheme of the Future Electron-Positron Collider (CERN)

    E-Print Network [OSTI]

    Bogomyagkov, A

    2015-01-01

    Design study in CERN of the accelerator that would fit 80-100 km tunnel called Future Circular Colliders (FCC) includes high-luminosity $e^+ e^?$ collider (FCC-ee) with center-of-mass energy from 90 to 350 GeV to study Higgs boson properties and perform precise measurements at the electroweak scale [1–3]. Crab waist interaction region provides collisions with luminosity higher than 2 × 10$^{36}$ cm$^{?2}$ sec$^{?1}$ at beam energy of 45 GeV. The small values of the beta functions at the interaction point and distant final focus lenses are the reasons for high nonlinear chromaticity limiting energy acceptance of the whole ring. The paper describes interaction region for crab waist collision scheme in the FCC-ee, principles of tuning the chromaticity correction section in order to provide large energy acceptance.

  19. Level scheme of /sup 148/Pm and the s-process neutron density

    SciTech Connect (OSTI)

    Lesko, K.T.; Norman, E.B.; Larimer, R.; Bacelar, J.C.; Beck, E.M.

    1989-02-01

    A level scheme of /sup 148/Pm up to 800 keV is deduced from gamma-ray coincidence data and published particle transfer data. Approximately 106 gamma-ray transitions have been placed between 36 levels. We have identified three levels below 500 keV in excitation which decay to both the ground state and to the isomeric level at 137 keV. The presence of these levels guarantees that /sup 148/Pm/sup g//sup ,//sup m/ are in thermal equilibrium during the s process. The s-process neutron density inferred from the branch point at /sup 148/Pm is deduced to be 3 x 10/sup 8//cm/sup 3/.

  20. Cryogenic Test of a Coaxial Coupling Scheme for Fundamental and Higher Order Modes in Superconducting Cavities

    SciTech Connect (OSTI)

    J.K. Sekutowicz, P. Kneisel

    2009-05-01

    A coaxial coupling device located in the beam pipe of the TESLA type superconducting cavities provides for better propagation of Higher Order Modes (HOMs) and their strong damping in appropriate HOM couplers. Additionally, it also provides efficient coupling for fundamental mode RF power into the superconducting cavity. The whole coupling device can be designed as a detachable system. If appropriately dimensioned, the magnetic field can be minimized to a negligible level at the flange position. This scheme, presented previously*, provides for several advantages: strong HOM damping, flangeable solution, exchangeability of the HOM damping device on a cavity, less complexity of the superconducting cavity, possible cost advantages. This contribution will describe the results of the first cryogenic test.

  1. Comparison of NNLO DIS scheme splitting functions with results from exact gluon kinematics at small x.

    E-Print Network [OSTI]

    White, C D; Thorne, Robert S

    ) = ?S ? ? 0 dk2 k2 hi(k2/Q2)f(N, k2, Q20)gB(N,Q 2 0), (1) where gB is the bare gluon distribution at momentum scale Q20, and the strong coupling ?S is fixed at LL order. The hi(k2/Q2) are the impact factors coupling the virtual photon to the gluon... )gB(N,Q 2 0), (2) which serves to define the impact factor h2. In a general factorisation scheme, one loses the simple inter- pretation of h2 as the coefficient function relating the gluon distribution to the structure function. Instead it represents...

  2. Stable water isotope simulation by current land-surface schemes:Results of IPILPS phase 1

    SciTech Connect (OSTI)

    Henderson-Sellers, A.; Fischer, M.; Aleinov, I.; McGuffie, K.; Riley, W.J.; Schmidt, G.A.; Sturm, K.; Yoshimura, K.; Irannejad, P.

    2005-10-31

    Phase 1 of isotopes in the Project for Intercomparison of Land-surface Parameterization Schemes (iPILPS) compares the simulation of two stable water isotopologues ({sup 1}H{sub 2} {sup 18}O and {sup 1}H{sup 2}H{sup 16}O) at the land-atmosphere interface. The simulations are off-line, with forcing from an isotopically enabled regional model for three locations selected to offer contrasting climates and ecotypes: an evergreen tropical forest, a sclerophyll eucalypt forest and a mixed deciduous wood. Here we report on the experimental framework, the quality control undertaken on the simulation results and the method of intercomparisons employed. The small number of available isotopically-enabled land-surface schemes (ILSSs) limits the drawing of strong conclusions but, despite this, there is shown to be benefit in undertaking this type of isotopic intercomparison. Although validation of isotopic simulations at the land surface must await more, and much more complete, observational campaigns, we find that the empirically-based Craig-Gordon parameterization (of isotopic fractionation during evaporation) gives adequately realistic isotopic simulations when incorporated in a wide range of land-surface codes. By introducing two new tools for understanding isotopic variability from the land surface, the Isotope Transfer Function and the iPILPS plot, we show that different hydrological parameterizations cause very different isotopic responses. We show that ILSS-simulated isotopic equilibrium is independent of the total water and energy budget (with respect to both equilibration time and state), but interestingly the partitioning of available energy and water is a function of the models' complexity.

  3. Accelerating development of advanced inverters : evaluation of anti-islanding schemes with grid support functions and preliminary laboratory demonstration.

    SciTech Connect (OSTI)

    Neely, Jason C.; Gonzalez, Sigifredo; Ropp, Michael; Schutz, Dustin

    2013-11-01

    The high penetration of utility interconnected photovoltaic (PV) systems is causing heightened concern over the effect that variable renewable generation will have on the electrical power system (EPS). These concerns have initiated the need to amend the utility interconnection standard to allow advanced inverter control functionalities that provide: (1) reactive power control for voltage support, (2) real power control for frequency support and (3) better tolerance of grid disturbances. These capabilities are aimed at minimizing the negative impact distributed PV systems may have on EPS voltage and frequency. Unfortunately, these advanced control functions may interfere with island detection schemes, and further development of advanced inverter functions requires a study of the effect of advanced functions on the efficacy of antiislanding schemes employed in industry. This report summarizes the analytical, simulation and experimental work to study interactions between advanced inverter functions and anti-islanding schemes being employed in distributed PV systems.

  4. Three-dimensional symmetry analysis of a direct-drive irradiation scheme for the laser megajoule facility

    SciTech Connect (OSTI)

    Ramis, R., E-mail: rafael.ramis@upm.es [E.T.S.I. Aeronáuticos, Universidad Politécnica de Madrid, P. Cardenal Cisneros 3, E-28040 Madrid (Spain); Temporal, M. [Centre de Mathématiques et de Leurs Applications, ENS Cachan and CNRS, 61 Av. du President Wilson, F-94235 Cachan Cedex (France); Canaud, B.; Brandon, V. [CEA, DIF, F-91297 Arpajon (France)

    2014-08-15

    The symmetry of a Direct-Drive (DD) irradiation scheme has been analyzed by means of three-dimensional (3D) simulations carried out by the code MULTI (R. Ramis et al., Comput. Phys. Commun. 49, 475 (1988)) that includes hydrodynamics, heat transport, and 3D laser ray-tracing. The implosion phase of a target irradiated by the Laser Megajoule (LMJ) facility in the context of the Shock Ignition scheme has been considered. The LMJ facility has been designed for Indirect-Drive, and by this reason that the irradiation scheme must be modified when used for DD. Thus, to improve the implosion uniformity to acceptable levels, the beam centerlines should be realigned and the beam power balance should be adjusted. Several alternatives with different levels of complexity are presented and discussed.

  5. Quantization rule solution to the Hulthén potential in arbitrary dimension by a new approximate scheme for the centrifugal term

    E-Print Network [OSTI]

    Sameer M. Ikhdair

    2012-03-13

    The bound state energies and wave functions for a particle exposed to the Hulth\\'en potential field in the D-dimensional space are obtained within the improved quantization rule for any arbitrary l state. The present approximation scheme used to deal with the centrifugal term in the effective Hulth\\'en potential is systematic and accurate. The solutions for the three-dimensional (D=3) case and the s-wave (l=0) case are briefly discussed. Keywords: Hulth\\'en potential, improved quantization rule, approximation schemes. 03.65.Ge, 12.39.Jh

  6. A staggered-grid finite-difference scheme optimized in the time–space domain for modeling scalar-wave propagation in geophysical problems

    SciTech Connect (OSTI)

    Tan, Sirui; Huang, Lianjie

    2014-11-01

    For modeling scalar-wave propagation in geophysical problems using finite-difference schemes, optimizing the coefficients of the finite-difference operators can reduce numerical dispersion. Most optimized finite-difference schemes for modeling seismic-wave propagation suppress only spatial but not temporal dispersion errors. We develop a novel optimized finite-difference scheme for numerical scalar-wave modeling to control dispersion errors not only in space but also in time. Our optimized scheme is based on a new stencil that contains a few more grid points than the standard stencil. We design an objective function for minimizing relative errors of phase velocities of waves propagating in all directions within a given range of wavenumbers. Dispersion analysis and numerical examples demonstrate that our optimized finite-difference scheme is computationally up to 2.5 times faster than the optimized schemes using the standard stencil to achieve the similar modeling accuracy for a given 2D or 3D problem. Compared with the high-order finite-difference scheme using the same new stencil, our optimized scheme reduces 50 percent of the computational cost to achieve the similar modeling accuracy. This new optimized finite-difference scheme is particularly useful for large-scale 3D scalar-wave modeling and inversion.

  7. Construction of the Thermodynamic Jamming Limit for the Parking Process and Other Exclusion Schemes on Z^d

    E-Print Network [OSTI]

    Thomas Logan Ritchie

    2004-12-22

    We provide an explicit construction of the thermodynamic jamming limit for the parking process and other finite range exclusion schemes on Z^d. By means thereof, a strong law of large numbers for occupation densities is accomplished, and, amongst other results, the so called "super-exponential" (i.e. gamma) decay of pair correlation functions is established.

  8. Near-complete polarization Bell-state analysis based on symmetry-broken scheme with linear optics

    E-Print Network [OSTI]

    Kong, Ling-Jun; Si, Yu; Liu, Rui; Tu, Chenghou; Wang, Hui-Tian

    2015-01-01

    Bell-state analysis is a considerable challenge and an essential requirement for reliable implementation of quantum communication proposals. An open question is the one for the maximal fraction of successful Bell measurements. It has been pointed out that no scheme using only linear elements can implement a Bell state analyzer. Some effort has paid attention to the complete polarization-entangled Bell-state analysis using linear optics, with the aid of auxiliary means. Here we present a symmetry-broken scheme with linear optics only, without any aid of other auxiliary means, for discriminating polarization-entangled Bell states. Although our scheme is unable of realizing complete Bell-state measurement for less photon-pairs situation, it can deterministically identify four Bell states with success probabilities beyond 99.2% provided that photon-pairs are not less than 8. Our scheme as a significant breakthrough is simpler and feasible with respect to the current technology for the near-complete Bell-state ana...

  9. A formally fourth-order accurate compact scheme for 3D Poisson equation in cylindrical and spherical

    E-Print Network [OSTI]

    Lai, Ming-Chih

    A formally fourth-order accurate compact scheme for 3D Poisson equation in cylindrical- pact Fourth-Order Poisson Solver on Polar Geometry, J. Comput. Phys., 182, 337-345 (2002)) to three the partial differential equations of Fourier coefficients are solved by a formally fourth-order accurate

  10. A Fourth Order Hermitian Box-Scheme with Fast Solver for the Poisson Problem in a Square

    E-Print Network [OSTI]

    Croisille, Jean-Pierre

    A Fourth Order Hermitian Box-Scheme with Fast Solver for the Poisson Problem in a Square Ali Abbas Metz, France email: croisil@poncelet.univ-metz.fr December 12, 2010 1 #12;Abstract A new fourth order the approximation of the gradient by the fourth order hermitian derivative, with a conservative discrete formulation

  11. 1132 OPTICS LETTERS / Vol. 21, No. 15 / August 1, 1996 Optical conveyor belts: a new scheme for

    E-Print Network [OSTI]

    Miller, Peter D.

    1132 OPTICS LETTERS / Vol. 21, No. 15 / August 1, 1996 Optical conveyor belts: a new scheme Research Centre, Optical Sciences Centre, Australian National University, Canberra ACT 0200, Australia with a different contrast, can be multiplexed on the same fiber. © 1996 Optical Society of America Like bright

  12. IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL. 64, NO. 1, JANUARY 2015 303 A Practical PSM Scheme for Varying Server Delay

    E-Print Network [OSTI]

    Qiao, Daji

    IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY, VOL. 64, NO. 1, JANUARY 2015 303 A Practical PSM Scheme such as the 802.11 power saving mode (PSM) have been used to limit the amount of time a NIC is awake, PSM may negatively impact packet delay. These delays are also unbounded and can significantly increase

  13. On the Comparison of Multiple Signature LDA and Neural Network Based Broken Rotor Bar Detection Schemes in Induction Motors

    E-Print Network [OSTI]

    Chow, Mo-Yuen

    Schemes in Induction Motors Bulent Ayhan, Mo-Yuen Chow, Myung-Hyun Song bayhan@unity.ncsu.edu, chow@eos.ncsu.edu, mhsong@sunchon.ac.kr Abstract ­ Broken rotor bars in induction motors can be detected by monitoring any abnormality of the spectrum amplitudes at certain frequencies in the motor current spectrum. Broken rotor bar

  14. IEEE TRANSACTIONS ON SMART GRID, VOL. 2, NO. 4, DECEMBER 2011 675 A Lightweight Message Authentication Scheme for

    E-Print Network [OSTI]

    Shen, Xuemin "Sherman"

    IEEE TRANSACTIONS ON SMART GRID, VOL. 2, NO. 4, DECEMBER 2011 675 A Lightweight Message Authentication Scheme for Smart Grid Communications Mostafa M. Fouda, Member, IEEE, Zubair Md. Fadlullah, Member Abstract--Smart grid (SG) communication has recently received significant attentions to facilitate

  15. Varying Probability Sampling The simple random sampling scheme provides a random sample where every unit in the population has

    E-Print Network [OSTI]

    Shalabh

    where every unit in the population has equal probability of selection. Under certain circumstances, more efficient estimators are obtained by assigning unequal probabilities of selection to the units scheme, the units are selected with probability proportional to the value of X, called as size

  16. Impact of Transport Schemes on Modeled Dust Concentrations MARIA RAFFAELLA VUOLO, LAURENT MENUT, AND HE LE` NE CHEPFER

    E-Print Network [OSTI]

    Menut, Laurent

    and for atmospheric particle rep- resentations. The horizontal transport depends on the meteorological fields [wind of numerical diffusion on transport accuracy In his review, Rood (1987) reminded us that more than 100 and accurate third- or fourth-order schemes. Reconciling between the numerical cost and accuracy, Corresponding

  17. On the Divergence-Free Condition in Godunov-Type Schemes for Ideal Magnetohydrodynamics: the Upwind Constrained Transport Method

    E-Print Network [OSTI]

    P. Londrillo; L. Del Zanna

    2003-10-07

    We present a general framework to design Godunov-type schemes for multidimensional ideal magnetohydrodynamic (MHD) systems, having the divergence-free relation and the related properties of the magnetic field B as built-in conditions. Our approach mostly relies on the 'Constrained Transport' (CT) discretization technique for the magnetic field components, originally developed for the linear induction equation, which assures div(B)=0 and its preservation in time to within machine accuracy in a finite-volume setting. We show that the CT formalism, when fully exploited, can be used as a general guideline to design the reconstruction procedures of the B vector field, to adapt standard upwind procedures for the momentum and energy equations, avoiding the onset of numerical monopoles of O(1) size, and to formulate approximate Riemann solvers for the induction equation. This general framework will be named here 'Upwind Constrained Transport' (UCT). To demonstrate the versatility of our method, we apply it to a variety of schemes, which are finally validated numerically and compared: a novel implementation for the MHD case of the second order Roe-type positive scheme by Liu and Lax (J. Comp. Fluid Dynam. 5, 133, 1996), and both the second and third order versions of a central-type MHD scheme presented by Londrillo and Del Zanna (Astrophys. J. 530, 508, 2000), where the basic UCT strategies have been first outlined.

  18. Programs for the work with ENSDF format files: Evaluator's editor EVE, Viewer for the nuclear level schemes

    E-Print Network [OSTI]

    G. I. Shulyak; A. A. Rodionov

    2010-04-19

    Tools for the regular work of the nuclear data evaluator are presented: the context-dependent editor EVE and the viewer for the level schemes of nuclei from ENSDF datasets. These programs may be used by everybody who works with the Evaluated Nuclear Structure Data File and for the educational purposed.

  19. IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 8, NO. 7, JULY 2009 3577 A Collision-Free MAC Scheme for

    E-Print Network [OSTI]

    Zhuang, Weihua

    for Wireless Communications, Depart- ment of Electrical and Computer Engineering, University of Waterloo, 200IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 8, NO. 7, JULY 2009 3577 A Collision-Free MAC Scheme for Multimedia Wireless Mesh Backbone Ping Wang, Member, IEEE, and Weihua Zhuang, Fellow, IEEE

  20. IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 25, NO. 7, JULY 2010 1761 A Soft Switching Scheme for Multiphase

    E-Print Network [OSTI]

    Mazumder, Sudip K.

    outlines a switching scheme to improve the energy efficiency for an isolated high-frequency multiphase dc the standpoints of cost, efficiency, and footprint. Index Terms--High efficiency, high-frequency link, isolated. It is more suitable for isolated low-voltage dc to three-phase high-voltage ac applications from

  1. Incorporation of a physically based melt pond scheme into the sea ice component of a climate model

    E-Print Network [OSTI]

    Feltham, Daniel

    Incorporation of a physically based melt pond scheme into the sea ice component of a climate model and evolution of melt ponds. Melt ponds accumulate on the surface of sea ice from snow and sea ice melt, melt ponds cover up to 50% of the sea ice surface. We have developed a melt pond evolution theory. Here

  2. Abstract--This paper presents a novel sum of absolute difference (SAD) scheme that significantly reduces the

    E-Print Network [OSTI]

    Kambhampati, Subbarao

    reduces the energy consumption of the motion estimation kernel in video coders. The proposed scheme values can be approximated, resulting in lower critical path delay and lower energy consumption implement sub-sampling to further reduce the energy consumption. Performance of the proposed technique

  3. NET DEGREES OF FREEDOM OF RECENT SCHEMES FOR THE MISO BC WITH DELAYED CSIT AND FINITE COHERENCE TIME

    E-Print Network [OSTI]

    Gesbert, David

    DoF that this scheme can be expected to yield in a realistic system by taking into account the cost Ericsson, Symantec, SAP, Monaco Telecom. Part of this work has been performed in the framework of the FP7 project ICT-317669 METIS, which is partly funded by the European Union. The authors would like

  4. A 110-Day Ensemble Forecasting Scheme for the Major River Basins of Bangladesh: Forecasting Severe Floods of 200307*

    E-Print Network [OSTI]

    Webster, Peter J.

    A 1­10-Day Ensemble Forecasting Scheme for the Major River Basins of Bangladesh: Forecasting Severe of the Brahmaputra and Ganges Rivers as they flow into Bangladesh; it has been operational since 2003. The Bangladesh points of the Ganges and Brahmaputra into Bangladesh. Forecasts with 1­10-day horizons are presented

  5. A Constrained Multipath Traffic Engineering Scheme for MPLS Networks Youngseok Lee, Yongho Seok, Yanghee Choi Changhoon Kim

    E-Print Network [OSTI]

    nodes. The proposed algorithms are applied to the multi- protocol label switching (MPLS) that permits explicit path setup. The paths and split ratio are calculated off-line, and passed to MPLS edge routers for explicit label-switched path (LSP) setup. The proposed schemes are tested in a large-scale fictitious back

  6. IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS, TPDS-2007-04-0119.R2 1 Distributed Deployment Schemes for

    E-Print Network [OSTI]

    Tseng, Yu-Chee

    , with the rapid progress in embedded micro-sensing MEMS and wireless communication technologies, wireless sensor Deployment Schemes for Mobile Wireless Sensor Networks to Ensure Multi-level Coverage You-Chiun Wang and Yu-Chee Tseng, Senior Member, IEEE Abstract-- One of the key research issues in wireless sensor networks (WSNs

  7. CONVERGENCE OF A NUMERICAL SCHEME FOR A NONLINEAR COUPLED SYSTEM OF RADIATIVE---CONDUCTIVE HEAT TRANSFER EQUATIONS

    E-Print Network [OSTI]

    Henri Poincaré -Nancy-Université, Université

    . Introduction And Main Results Radiative heat transfer coupled with conduction through semi---transparent media---state combined radiative---conductive heat transfer. The media studied were assumed to be homogeneous, grey1 CONVERGENCE OF A NUMERICAL SCHEME FOR A NONLINEAR COUPLED SYSTEM OF RADIATIVE---CONDUCTIVE HEAT

  8. Well-Balanced Positivity Preserving Central-Upwind Scheme for the Shallow Water System with Friction Terms

    E-Print Network [OSTI]

    Chertock, Alina

    . Hydrol., 382 (2010), pp. 88­102], designed to mimic the rain water drainage in urban areas containing houses. Since the rain water depth is typically several orders of magnitude smaller than the heightWell-Balanced Positivity Preserving Central-Upwind Scheme for the Shallow Water System

  9. Conservation principles and actionConservation principles and action schemes in the synthesis ofschemes in the synthesis of

    E-Print Network [OSTI]

    Pineda, Luis

    Diagrammatic reasoning Reasoning Learning Perception Design and creativity Theorem proving Ubiquitous in science Dr. Luis Pineda, IIMAS, UNAM, 2009 The theory...The theory... Action schemes (a synthetic machinery) A notion of re-interpretation A geometric description machinery Conservation principles The arithmetic

  10. DQE of wireless digital detectors: Comparative performance with differing filtration schemes

    SciTech Connect (OSTI)

    Samei, Ehsan [Carl E. Ravin Advanced Imaging Laboratories, Departments of Radiology, Biomedical Engineering, Physics, and Electrical and Computer Engineering, Medical Physics Graduate Program, Duke University Medical Center, Durham, North Carolina 27705 (United States)] [Carl E. Ravin Advanced Imaging Laboratories, Departments of Radiology, Biomedical Engineering, Physics, and Electrical and Computer Engineering, Medical Physics Graduate Program, Duke University Medical Center, Durham, North Carolina 27705 (United States); Murphy, Simon; Christianson, Olav [Medical Physics Graduate Program, Duke University, Durham, North Carolina 27705 (United States)] [Medical Physics Graduate Program, Duke University, Durham, North Carolina 27705 (United States)

    2013-08-15

    Purpose: Wireless flat panel detectors are gaining increased usage in portable medical imaging. Two such detectors were evaluated and compared with a conventional flat-panel detector using the formalism of the International Electrotechnical Commission (IEC 62220-1) for measuring modulation transfer function (MTF), normalized noise power spectrum (NNPS), and detective quantum efficiency (DQE) using two different filtration schemes.Methods: Raw images were acquired for three image receptors (DRX-1C and DRX-1, Carestream Health; Inc., Pixium 4600, Trixell) using a radiographic system with a well-characterized output (Philips Super80 CP, Philips Healthcare). Free in-air exposures were measured using a calibrated radiation meter (Unfors Mult-O-Meter Type 407, Unfors Instruments AB). Additional aluminum filtration and a new alternative combined copper-aluminum filtration were used to conform the x ray output to IEC-specified beam quality definitions RQA5 and RQA9. Using the IEC 62220-1 formalism, each detector was evaluated at X{sub N}/2, X{sub N}, and 2X{sub N}, where the normal exposure level to the detector surface (X{sub N}) was set to 8.73 ?Gy (1.0 mR). The prescribed edge test device was used to evaluate the MTF, while the NNPS was measured using uniform images. The DQE was then calculated from the MTF and NNPS and compared across detectors, exposures, and filtration schemes.Results: The three DR systems had largely comparable MTFs with DRX-1 demonstrating lower values above 1.0 cycles/mm. At each exposure, DRX-1C and Pixium detectors demonstrated better noise performance than that of DRX-1. Zero-frequency DQEs for DRX-1C, Pixium, and DRX-1 detectors were approximately 74%, 63%, and 38% for RQA5 and 50%, 42%, and 28% for RQA9, respectively.Conclusions: DRX-1C detector exhibited superior DQE performance compared to Pixium and DRX-1. In terms of filtration, the alternative filtration was found to provide comparable performance in terms of rank ordering of different detectors with the added convenience of being less bulky for in-the-field measurements.

  11. Simulations of Detonation Wave Propagation in Rectangular Ducts Using a Three-Dimensional WENO Scheme

    E-Print Network [OSTI]

    Dou, Hua-Shu; Khoo, Boo Cheong; Qiu, Jianxian

    2010-01-01

    This paper reports high resolution simulations using a fifth-order weighted essentially non-oscillatory (WENO) scheme with a third order TVD Runge-Kutta time stepping method to examine the features of detonation front and physics in square ducts. The simulations suggest that two and three-dimensional detonation wave front formations are greatly enhanced by the presence of transverse waves. The motion of transverse waves generates triple points (zones of high pressure and large velocity coupled together), which cause the detonation front to become locally overdriven and thus form "hot spots". The transversal motion of these hot spots maintains the detonation to continuously occur along the whole front in two and three-dimensions. The present simulations indicate that the influence of the transverse waves on detonation is more profound in three dimensions and the pattern of quasi-steady detonation fronts also depends on the duct size. For a narrow duct (4LX4L where L is the half reaction length), the detonation...

  12. An efficient parallel implementation of explicit multirate Runge–Kutta schemes for discontinuous Galerkin computations

    SciTech Connect (OSTI)

    Seny, Bruno, E-mail: bruno.seny@uclouvain.be; Lambrechts, Jonathan; Toulorge, Thomas; Legat, Vincent; Remacle, Jean-François

    2014-01-01

    Although explicit time integration schemes require small computational efforts per time step, their efficiency is severely restricted by their stability limits. Indeed, the multi-scale nature of some physical processes combined with highly unstructured meshes can lead some elements to impose a severely small stable time step for a global problem. Multirate methods offer a way to increase the global efficiency by gathering grid cells in appropriate groups under local stability conditions. These methods are well suited to the discontinuous Galerkin framework. The parallelization of the multirate strategy is challenging because grid cells have different workloads. The computational cost is different for each sub-time step depending on the elements involved and a classical partitioning strategy is not adequate any more. In this paper, we propose a solution that makes use of multi-constraint mesh partitioning. It tends to minimize the inter-processor communications, while ensuring that the workload is almost equally shared by every computer core at every stage of the algorithm. Particular attention is given to the simplicity of the parallel multirate algorithm while minimizing computational and communication overheads. Our implementation makes use of the MeTiS library for mesh partitioning and the Message Passing Interface for inter-processor communication. Performance analyses for two and three-dimensional practical applications confirm that multirate methods preserve important computational advantages of explicit methods up to a significant number of processors.

  13. Multiscale schemes for the predictive description and virtual engineering of materials.

    SciTech Connect (OSTI)

    von Lilienfeld-Toal, Otto Anatole

    2010-09-01

    This report documents research carried out by the author throughout his 3-years Truman fellowship. The overarching goal consisted of developing multiscale schemes which permit not only the predictive description but also the computational design of improved materials. Identifying new materials through changes in atomic composition and configuration requires the use of versatile first principles methods, such as density functional theory (DFT). Using DFT, its predictive reliability has been investigated with respect to pseudopotential construction, band-gap, van-der-Waals forces, and nuclear quantum effects. Continuous variation of chemical composition and derivation of accurate energy gradients in compound space has been developed within a DFT framework for free energies of solvation, reaction energetics, and frontier orbital eigenvalues. Similar variations have been leveraged within classical molecular dynamics in order to address thermal properties of molten salt candidates for heat transfer fluids used in solar thermal power facilities. Finally, a combination of DFT and statistical methods has been used to devise quantitative structure property relationships for the rapid prediction of charge mobilities in polyaromatic hydrocarbons.

  14. The main injector chromaticity correction sextupole magnets: Measurements and operating schemes

    SciTech Connect (OSTI)

    Bhat, C.M.; Bogacz, A.; Brown, B.C.; Harding, D.J.; Fang, S.J.; Martin, P.S.; Glass, H.D.; Sim, J.

    1995-05-01

    The Fermilab Main Injector (FMI) is a high intensity proton synchrotron which will be used to accelerate protons and antiprotons from 8.9 GeV/c to 150 GeV/c. The natural chromaticities of the machine for the horizontal and the vertical Planes are {minus}33.6 and {minus}33.9 respectively. The {Delta}p/p of the beam at injection is about 0.002. The chromaticity requirements of the FMI, are primarily decided by the {Delta}p/p = 0.002 of the beam at injection. This limits the final chromaticity of the FMI to be {plus_minus}5 units. To correct the chromaticity in the FMI two families of sextupole magnets will be installed in the lattice, one for each plane. A sextupole magnet suitable for the FMI needs has been designed and a number of them are being built. New chromaticity compensation schemes have been worked out in the light of recently proposed faster acceleration ramps. On an R/D sextupole magnet the low current measurements have been carried out to determine the electrical properties. Also, using a Morgan coil, measurements have been performed to determine the higher ordered multipole components up to 18-poles. An overview of these result are presented here.

  15. Standing Sausage Modes In Nonuniform Magnetic Tubes: An Inversion Scheme For Inferring Flare Loop Parameters

    E-Print Network [OSTI]

    Chen, Shao-Xia; Xiong, Ming; Yu, Hui; Guo, Ming-Zhe

    2015-01-01

    Standing sausage modes in flare loops are important for interpreting quasi-periodic pulsations (QPPs) in solar flare lightcurves. We propose an inversion scheme that consistently uses their periods $P$ and damping times $\\tau$ to diagnose flare loop parameters. We derive a generic dispersion relation governing linear sausage waves in pressure-less straight tubes, for which the transverse density inhomogeneity takes place in a layer of arbitrary width $l$ and is of arbitrary form. We find that $P$ and $\\tau$ depend on the combination of $[R/v_{\\rm Ai}, L/R, l/R, \\rho_{\\rm i}/\\rho_{\\rm e}]$, where $R$ is the loop radius, $L$ is the looplength, $v_{\\rm Ai}$ is the internal Alfv\\'en speed, and $\\rho_{\\rm i}/\\rho_{\\rm e}$ is the density contrast. For all the density profiles examined, $P$ and $\\tau$ experience saturation when $L/R \\gg 1$, yielding an inversion curve in the $[R/v_{\\rm Ai}, l/R, \\rho_{\\rm i}/\\rho_{\\rm e}]$ space with a specific density profile when $L/R$ is sufficiently large. When applied to a spat...

  16. Webs, Lenard schemes, and the local geometry of bihamiltonian Toda and Lax structures

    E-Print Network [OSTI]

    Israel M. Gelfand; Ilya Zakharevich

    2000-03-27

    We introduce a criterion that a given bihamiltonian structure allows a local coordinate system where both brackets have constant coefficients. This criterion is applied to the bihamiltonian open Toda lattice in a generic point, which is shown to be locally isomorphic to a Kronecker odd-dimensional pair of brackets with constant coefficients. This shows that the open Toda lattice cannot be locally represented as a product of two bihamiltonian structures. In a generic point the bihamiltonian periodic Toda lattice is shown to be isomorphic to a product of two open Toda lattices (one of which is a (trivial) structure of dimension 1). While the above results might be obtained by more traditional methods, we use an approach based on general results on geometry of webs. This demonstrates a possibility to apply a geometric language to problems on bihamiltonian integrable systems, such a possibility may be no less important than the particular results proven in this paper. Based on these geometric approaches, we conjecture that decompositions similar to the decomposition of the periodic Toda lattice exist in local geometry of the Volterra system, the complete Toda lattice, the multidimensional Euler top, and a regular bihamiltonian Lie coalgebra. We also state general conjectures about geometry of more general ``homogeneous'' finite-dimensional bihamiltonian structures. The class of homogeneous structures is shown to coincide with the class of system integrable by Lenard scheme. The bihamiltonian structures which allow a non-degenerate Lax structure are shown to be locally isomorphic to the open Toda lattice.

  17. Approximation Schemes for Sequential Posted Pricing in Multi-Unit Auctions

    E-Print Network [OSTI]

    Chakraborty, Tanmoy; Guha, Sudipto; Mansour, Yishay; Muthukrishnan, S

    2010-01-01

    We design algorithms for computing approximately revenue-maximizing {\\em sequential posted-pricing mechanisms (SPM)} in $K$-unit auctions, in a standard Bayesian model. A seller has $K$ copies of an item to sell, and there are $n$ buyers, each interested in only one copy, who have some value for the item. The seller must post a price for each buyer, the buyers arrive in a sequence enforced by the seller, and a buyer buys the item if its value exceeds the price posted to it. The seller does not know the values of the buyers, but have Bayesian information about them. An SPM specifies the ordering of buyers and the posted prices, and may be {\\em adaptive} or {\\em non-adaptive} in its behavior. The goal is to design SPM in polynomial time to maximize expected revenue. We compare against the expected revenue of optimal SPM, and provide a polynomial time approximation scheme (PTAS) for both non-adaptive and adaptive SPMs. This is achieved by two algorithms: an efficient algorithm that gives a $(1-\\frac{1}{\\sqrt{2\\p...

  18. Fluid Dynamic Aspects of the Porous Wetted Wall Protection Scheme for Inertial Fusion Energy Reactors

    SciTech Connect (OSTI)

    Shin, S.; Abdelall, F.; Juric, D.; Abdel-Khalik, S.I.; Yoda, M.; Sadowski, D. [Georgia Institute of Technology (United States)

    2003-05-15

    A numerical and experimental investigation has been conducted to analyze the fluid dynamic aspects of the porous wetted wall protection scheme for inertial fusion energy (IFE) reactor first walls. A level contour reconstruction method has been used to track the three-dimensional evolution of the liquid film surface on porous downward-facing walls with different initial film thickness, liquid injection velocity through the porous wall, surface disturbance amplitude, configuration and mode number, liquid properties, and surface inclination angle. Generalized charts for the computed droplet detachment time, detached droplet equivalent diameter, and minimum film thickness during the transient for various design parameters and coolant properties are presented.In order to validate the numerical results over a wide range of parameters, an experimental test facility has been designed and constructed to simulate the hydrodynamics of downward-facing porous wetted walls. Nondimensionalization of the model shows that water can be adequately used as a simulant to validate the numerical results. Preliminary experimental results show good agreement with model predictions. The results of this investigation should allow designers of conceptual IFE reactors to identify appropriate 'windows' for successful operation of the porous wetted wall protection concept for different coolants.

  19. 20 IEEE TRANSACTIONS ON COMMUNICATIONS, VOL. 43, NO. 1, JANUARY 1995 An Effective Go-Back-N ARQ Scheme for Variable-Error-Rate Channels

    E-Print Network [OSTI]

    Yao, Yu-Dong

    and resequencing at the receiver end [I]. The operation procedure and throughput efficiency of the basic go-back duration). Sastry modified the basic go-back-N scheme by transmitting the erred block continuously until in [2] and [3] result in better performance than the basic go-back- N scheme only if the channel stays

  20. Mesoscale model cloud scheme assessment using satellite observations Jean-Pierre Chaboureau, Jean-Pierre Cammas, Patrick J. Mascart, and Jean-Pierre Pinty

    E-Print Network [OSTI]

    Chaboureau, Jean-Pierre

    Mesoscale model cloud scheme assessment using satellite observations Jean-Pierre Chaboureau, Jean of the mesoscale nonhydrostatic (Meso-NH) model has been conducted by comparing synthetic METEOSAT brightness combines the output from a bulk explicit cloud scheme routinely used in mesoscale simulations