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1

Indonesia-GTZ Mini-Hydropower Schemes for Sustainable Economic Development  

Open Energy Info (EERE)

Indonesia-GTZ Mini-Hydropower Schemes for Sustainable Economic Development Indonesia-GTZ Mini-Hydropower Schemes for Sustainable Economic Development Jump to: navigation, search Logo: Indonesia-GTZ Mini-Hydropower Schemes for Sustainable Economic Development Name Indonesia-GTZ Mini-Hydropower Schemes for Sustainable Economic Development Agency/Company /Organization Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH Partner on behalf of Bundesministerium für Wirtschaftliche Zusammenarbeit und Entwicklung (BMZ); Directorate General for International Cooperation (DGIS Niederlande) Sector Energy Topics Background analysis Website http://www.gtz.de/en/themen/16 Program Start 1999 Program End 2008 Country Indonesia UN Region South-Eastern Asia References Mini-Hydropower Schemes for Sustainable Economic Development[1]

2

Indonesia-GTZ Emissions Reductions in Urban Transport | Open Energy  

Open Energy Info (EERE)

Reductions in Urban Transport Reductions in Urban Transport Jump to: navigation, search Logo: Indonesia-GTZ Emissions Reductions in Urban Transport Name Indonesia-GTZ Emissions Reductions in Urban Transport Agency/Company /Organization GTZ Partner Ministry of Transportation Sector Energy Focus Area Transportation Topics Background analysis Website http://www.gtz.de/en/themen/um Program Start 2008 Program End 2012 Country Indonesia UN Region South-Eastern Asia References GTZ Transport & Climate Change Website[1] GTZ is working with Indonesia on this program with the following objective: "Indonesian cities increasingly plan and implement measures for a transport system that is energy efficient as well as environmentally and climate friendly." Background of the project is the absence of a national policy on

3

Upstream Nonoscillatory Advection Schemes  

Science Conference Proceedings (OSTI)

Upstream nonoscillatory (UNO) advection schemes are derived by optimizing existing classical advection schemes and combining them in different monotonic zones to avoid flux limiters for simplicity. The UNO schemes are extended to irregular grids ...

Jian-Guo Li

2008-12-01T23:59:59.000Z

4

MIT Scheme Reference Manual  

E-Print Network (OSTI)

MIT Scheme is an implementation of the Scheme programming language that runs on many popular workstations. The MIT Scheme Reference Manual describes the special forms, procedures, and datatypes provided by the ...

Hanson, Chris

1991-01-01T23:59:59.000Z

5

Low Energy Distillation Schemes  

E-Print Network (OSTI)

In this paper we look at various options available for the reduction of energy consumption in distillation systems. For binary systems, we look at how heat pumps can be used. With multi-component systems, process integration offers a means of reducing energy consumption. We look at how the better integrated distillation schemes can be quickly identified. It is found that the design of integrated schemes is quicker than that of non-integrated schemes. We then look at how the use of heat pumps, non-isobaric operation and divided wall columns may be incorporated into the synthesis of multi-component separation schemes. It will be seen that process integration provides an important means of reducing energy consumption in distillation processes. However, its conventional use requires the installation of piping (and pipes carrying vapor streams tend to be of large diameter and are consequently expensive). So, finally we examine a way in which the capital cost of such systems can be reduced: the divided wall column.

Polley, G. T.

2002-04-01T23:59:59.000Z

6

On Metering Schemes Ventzislav Nikov  

E-Print Network (OSTI)

On Metering Schemes Ventzislav Nikov Department of Mathematics and Computing Science, Eindhoven (threshold) metering schemes secure against coalitions of corrupt servers and clients. Sev- eral researchers have generalized the idea of Naor and Pinkas: first metering scheme with pricing and dynamic multi

Nikova, Svetla Iordanova

7

Legal reasoning with argumentation schemes  

Science Conference Proceedings (OSTI)

Legal reasoning typically requires a variety of argumentation schemes to be used together. A legal case may raise issues requiring argument from precedent cases, rules, policy goals, moral principles, jurisprudential doctrine, social values and evidence. ...

Thomas F. Gordon; Douglas Walton

2009-06-01T23:59:59.000Z

8

Thermodynamic scheme of inhomogeneous perfect fluid mixtures  

E-Print Network (OSTI)

Astron. Soc. 140 461 Thermodynamic scheme of inhomogeneousto have a different thermodynamic framework, in which non-S0264-9381(04)68056-7 Thermodynamic scheme of inhomogeneous

Zarate, R D; Quevedo, Hernando

2004-01-01T23:59:59.000Z

9

Contact transformations for difference schemes  

E-Print Network (OSTI)

We define a class of transformations of the dependent and independent variables in an ordinary difference scheme. The transformations leave the solution set of the system invariant and reduces to a group of contact transformations in the continuous limit. We use a simple example to show that the class is not empty and that such "contact transformations for discrete systems" genuinely exist.

Levi, Decio; Winternitz, Pavel

2011-01-01T23:59:59.000Z

10

The Conversion of Semi-Lagrangian Advection Schemes to Quasi-Monotone Schemes  

Science Conference Proceedings (OSTI)

A method to convert conventional semi-Lagrangian schemes into quasi-monotone schemes is given. Numerical examples with linear and nonlinear transport equations demonstrate the ability of our modified semi-Lagrangian schemes to better maintain the ...

Rodolfo Bermejo; Andrew Staniforth

1992-11-01T23:59:59.000Z

11

Decoupling schemes for the SSC Collider  

Science Conference Proceedings (OSTI)

A decoupling system is designed for the SSC Collider. This system can accommodate three decoupling schemes by using 44 skew quadrupoles in the different configurations. Several decoupling schemes are studied and compared in this paper.

Cai, Y.; Bourianoff, G.; Cole, B.; Meinke, R.; Peterson, J.; Pilat, F.; Stampke, S.; Syphers, M.; Talman, R.

1993-05-01T23:59:59.000Z

12

Dynamic Grid Adaptation Using the MPDATA Scheme  

Science Conference Proceedings (OSTI)

A dynamic grid adaptation (DGA) scheme is developed using various combinations of the multidimensional positive definite advection transport algorithm (MPDATA) to show the applicability of DGA with the MPDATA scheme to solve advection problems. A ...

John P. Iselin; Joseph M. Prusa; William J. Gutowski

2002-04-01T23:59:59.000Z

13

Staggered Schemes for Fluctuating Hydrodynamics  

E-Print Network (OSTI)

We develop numerical schemes for solving the isothermal compressible and incompressible equations of fluctuating hydrodynamics on a grid with staggered momenta. We develop a second-order accurate spatial discretization of the diffusive, advective and stochastic fluxes that satisfies a discrete fluctuation-dissipation balance, and construct temporal discretizations that are at least second-order accurate in time deterministically and in a weak sense. Specifically, the methods reproduce the correct equilibrium covariances of the fluctuating fields to third (compressible) and second (incompressible) order in the time step, as we verify numerically. We apply our techniques to model recent experimental measurements of giant fluctuations in diffusively mixing fluids in a micro-gravity environment [A. Vailati et. al., Nature Communications 2:290, 2011]. Numerical results for the static spectrum of non-equilibrium concentration fluctuations are in excellent agreement between the compressible and incompressible simula...

Balboa, F; Delgado-Buscalioni, R; Donev, A; Fai, T; Griffith, B; Peskin, C S

2011-01-01T23:59:59.000Z

14

A NEW RELAXATION SCHEME FOR MATHEMATICAL PROGRAMS ...  

E-Print Network (OSTI)

(MPEC), where the complementarity constraints are replaced by a ... The relaxation scheme is such that a strongly stationary solution of the MPEC is also a.

15

NP-Hard Manipulations of Voting Schemes  

E-Print Network (OSTI)

Voting schemes are common social choice function that allow voters to aggregate their preferences in a socially desirable way. Unfortunately, the Gibbard-

Elizabeth Cross

2005-01-01T23:59:59.000Z

16

Point transformations in invariant difference schemes  

E-Print Network (OSTI)

In this paper, we show that when two systems of differential equations admitting a symmetry group are related by a point transformation it is always possible to generate invariant schemes, one for each system, that are also related by the same transformation. This result is used to easily obtain new invariant schemes of some differential equations.

Francis Valiquette

2005-07-17T23:59:59.000Z

17

Locally exact modifications of discrete gradient schemes  

E-Print Network (OSTI)

Locally exact integrators preserve linearization of the original system at every point. We construct energy-preserving locally exact discrete gradient schemes for arbitrary multidimensional canonical Hamiltonian systems by modifying classical discrete gradient schemes. Modifications of this kind are found for any discrete gradient.

Cie?li?ski, Jan L

2013-01-01T23:59:59.000Z

18

A Lattice BGK Scheme with General Propagation  

Science Conference Proceedings (OSTI)

The standard Lattice BGK (LBGK) scheme often encounters numerical instability in simulation of fluid flow with small kinematic viscosity or as the nondimensional relaxation time ? is close to 0.5. In this paper, based on a time-splitting scheme ... Keywords: lattice BGK method, numerical stability

Zhaoli Guo; Chuguang Zheng; T. S. Zhao

2002-02-01T23:59:59.000Z

19

Dynamic Multi--Threshold Metering Schemes  

E-Print Network (OSTI)

Dynamic Multi--Threshold Metering Schemes Carlo Blundo, Annalisa De Bonis, Barbara Masucci of Waterloo Waterloo, Ontario, N2L 3G1, Canada E­mail: dstinson@cacr.math.uwaterloo.ca Abstract A metering and servers on the web during a certain number of time frames. Naor and Pinkas [7] considered metering schemes

Stinson, Douglas

20

The Multi-Dimensional Crowley Advection Scheme  

Science Conference Proceedings (OSTI)

The conservation form of the second-order Crowley advection scheme, as some authors have pointed out, may lead to numerical instability for multi-dimensional blows. Replacing the original second-order-accurate approximation of the first spatial ...

Piotr K. Smolarkiewicz

1982-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

A Classification Scheme for Satellite Temperature Retrievals  

Science Conference Proceedings (OSTI)

A new approach is presented to the problem of specifying constraints on retrieval estimators used to calculate vertical temperature profiles from satellite measurements of upwelling radiance. An unsupervised classification scheme determines the ...

M. J. Uddstrom; D. Q. Wark

1985-01-01T23:59:59.000Z

22

A Bayesian Quantitative Precipitation Nowcast Scheme  

Science Conference Proceedings (OSTI)

Very short-period quantitative precipitation forecast (QPF) or nowcast schemes provide deterministic output that fails to convey explicit measures of the uncertainty in the forecast. Presented here is a forecast methodology based upon a Bayesian ...

Neil I. Fox; Christopher K. Wikle

2005-06-01T23:59:59.000Z

23

Analysis Scheme in the Ensemble Kalman Filter  

Science Conference Proceedings (OSTI)

This paper discusses an important issue related to the implementation and interpretation of the analysis scheme in the ensemble Kalman filter. It is shown that the observations must be treated as random variables at the analysis steps. That is, ...

Gerrit Burgers; Peter Jan van Leeuwen; Geir Evensen

1998-06-01T23:59:59.000Z

24

Filtering Integration Schemes Based on the Laplace and Z Transforms  

Science Conference Proceedings (OSTI)

A filtering integration scheme based on a modification of the inversion integral for the Laplace transform (LT) is developed and implemented in a barotropic limited-area model. The LT scheme is compared to a conventional scheme and shown to ...

Peter Lynch

1991-03-01T23:59:59.000Z

25

An Alternative Leapfrog Scheme for Surface Gravity Wave Equations  

Science Conference Proceedings (OSTI)

An alternative leapfrog scheme using a staggered time grid system is proposed to solve surface gravity wave equations. In addition to the nondissipative second-order accuracy scheme that is inherent in the standard leapfrog scheme, the ...

Weidong Zhou

2002-09-01T23:59:59.000Z

26

Including Atmospheric Layers in Vegetation and Urban Offline Surface Schemes  

Science Conference Proceedings (OSTI)

A formulation to include prognostic atmospheric layers in offline surface schemes is derived from atmospheric equations. Whereas multilayer schemes developed previously need a complex coupling between atmospheric-model levels and surface-scheme ...

Valry Masson; Yann Seity

2009-07-01T23:59:59.000Z

27

Building Energy Software Tools Directory: SIP Scheming  

NLE Websites -- All DOE Office Websites (Extended Search)

SIP Scheming SIP Scheming Energy analysis and cost estimating software specifically designed for stressed skin insulating core (SSIC) panel producers; calculates results within a matter of minutes. SIP (Structural Insulated Panel) Scheming also analyzes conventional framing and frame panels, and can be used for residential or commercial building types. Keywords stressed skin insulating core panels Validation/Testing N/A Expertise Required Relatively little technical knowledge required; knowledge of ArchiCad, Excel and DOE-2 necessary to use export features. Users Beta test version available. Audience Manufacturers of stressed skin insulating core panels. Input Drawings input either by scanning or imported from a CAD program, or drawn directly using a basic set of drawing tools; construction of elements such

28

High order well-balanced schemes  

SciTech Connect

In this paper the authors review some recent work on high-order well-balanced schemes. A characteristic feature of hyperbolic systems of balance laws is the existence of non-trivial equilibrium solutions, where the effects of convective fluxes and source terms cancel each other. Well-balanced schemes satisfy a discrete analogue of this balance and are therefore able to maintain an equilibrium state. They discuss two classes of schemes, one based on high-order accurate, non-oscillatory finite difference operators which are well-balanced for a general class of equilibria, and the other one based on well-balanced quadratures, which can - in principle - be applied to all equilibria. Applications include equilibria at rest, where the flow velocity vanishes, and also the more challenging moving flow equilibria. Numerical experiments show excellent resolution of unperturbed as well as slightly perturbed equilibria.

Noelle, Sebastian [Institut fur Physikalische Chemie der RWTH; Xing, Yulong [ORNL; Shu, Chi-wang [Brown University

2010-01-01T23:59:59.000Z

29

Splitting schemes for hyperbolic heat conduction equation  

E-Print Network (OSTI)

Rapid processes of heat transfer are not described by the standard heat conduction equation. To take into account a finite velocity of heat transfer, we use the hyperbolic model of heat conduction, which is connected with the relaxation of heat fluxes. In this case, the mathematical model is based on a hyperbolic equation of second order or a system of equations for the temperature and heat fluxes. In this paper we construct for the hyperbolic heat conduction equation the additive schemes of splitting with respect to directions. Unconditional stability of locally one-dimensional splitting schemes is established. New splitting schemes are proposed and studied for a system of equations written in terms of the temperature and heat fluxes.

Vabishchevich, Petr N

2010-01-01T23:59:59.000Z

30

Cooling scheme for turbine hot parts  

DOE Patents (OSTI)

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.

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)

2000-01-01T23:59:59.000Z

31

A Survey of Unix Init Schemes  

E-Print Network (OSTI)

In most modern operating systems, init (as in "initialization") is the program launched by the kernel at boot time. It runs as a daemon and typically has PID 1. Init is responsible for spawning all other processes and scavenging zombies. It is also responsible for reboot and shutdown operations. This document describes existing solutions that implement the init process and/or init scripts in Unix-like systems. These solutions range from the legacy and still-in-use BSD and SystemV schemes, to recent and promising schemes from Ubuntu, Apple, Sun and independent developers. Our goal is to highlight their focus and compare their sets of features.

Yvan Royon; Stphane Frnot

2007-06-19T23:59:59.000Z

32

Security problem on arbitrated quantum signature schemes  

E-Print Network (OSTI)

Until now, there have been developed many arbitrated quantum signature schemes implemented with a help of a trusted third party. In order to guarantee the unconditional security, most of them take advantage of the optimal quantum one-time encryption method based on Pauli operators. However, we in this paper point out that the previous schemes only provides a security against total break and actually show that there exists a simple existential forgery attack to validly modify the transmitted pair of message and signature. In addition, we also provide a simple method to recover the security against the proposed attack.

Jeong Woon Choi; Ku-Young Chang; Dowon Hong

2011-06-27T23:59:59.000Z

33

Kipnis-shamir attack on unbalanced oil-vinegar scheme  

Science Conference Proceedings (OSTI)

The public key of the Oil-Vinegar scheme consists of a set of m quadratic equations in m+n variables over a finite field Fq. Kipnis and Shamir broke the balanced Oil-Vinegar scheme where d = n-m = 0 by finding equivalent ... Keywords: Kipnis-Shamir attack, Oil-Vinegar scheme, multivariate public key cryptosystem, signature scheme

Weiwei Cao; Lei Hu; Jintai Ding; Zhijun Yin

2011-05-01T23:59:59.000Z

34

A New Fourth-Order Enstrophy and Energy Conserving Scheme  

Science Conference Proceedings (OSTI)

A new pseudo-fourth-order finite-difference scheme for the shallow-water and primitive equations is derived. This scheme is a C-grid scheme that conserves energy and conserves enstrophy in the nondivergent limit. The accuracy of the scheme is ...

Frank Abramopoulos

1991-01-01T23:59:59.000Z

35

Cross-ontological analytics for alignment of different classification schemes  

Science Conference Proceedings (OSTI)

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.

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

2010-09-28T23:59:59.000Z

36

Markets and Support Schemes for Renewable  

E-Print Network (OSTI)

Markets and Support Schemes for Renewable Technologies Senior Research Specialist Poul Erik (Denmark, Norway, Sweden, Finland), England - Other countries on the way · Development of renewable energy technologies - EU targets for renewable deployment - Especially wind power experiences a rapid development #12

37

A classification scheme for LWR fuel assemblies  

Science Conference Proceedings (OSTI)

With over 100 light water nuclear reactors operating nationwide, representing designs by four primary vendors, and with reload fuel manufactured by these vendors and additional suppliers, a wide variety of fuel assembly types are in existence. At Oak Ridge National Laboratory, both the Systems Integration Program and the Characteristics Data Base project required a classification scheme for these fuels. This scheme can be applied to other areas and is expected to be of value to many Office of Civilian Radioactive Waste Management programs. To develop the classification scheme, extensive information on the fuel assemblies that have been and are being manufactured by the various nuclear fuel vendors was compiled, reviewed, and evaluated. It was determined that it is possible to characterize assemblies in a systematic manner, using a combination of physical factors. A two-stage scheme was developed consisting of 79 assembly types, which are grouped into 22 assembly classes. The assembly classes are determined by the general design of the reactor cores in which the assemblies are, or were, used. The general BWR and PWR classes are divided differently but both are based on reactor core configuration. 2 refs., 15 tabs.

Moore, R.S.; Williamson, D.A.; Notz, K.J.

1988-11-01T23:59:59.000Z

38

Compact upwind schemes on adaptive octrees  

Science Conference Proceedings (OSTI)

Compact high-order upwind schemes using reconstruction from cell-averages are derived for application with the compressible three-dimensional Navier-Stokes equations. An adaptive-octree mesh, combined with the Adams-Bashforth-Moulton family of predictor-corrector ... Keywords: Finite-volume, High-order, Navier-Stokes, Predictor-corrector

Scott M. Murman

2010-02-01T23:59:59.000Z

39

BRAZIL VISITING FELLOWSHIP SCHEME Application Form  

E-Print Network (OSTI)

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

Birmingham, University of

40

The Scheme of Beam Synchronization in MEIC  

Science Conference Proceedings (OSTI)

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.

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

2013-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Finite volume schemes for Boussinesq type equations  

E-Print Network (OSTI)

Finite volume schemes are commonly used to construct approximate solutions to conservation laws. In this study we extend the framework of the finite volume methods to dispersive water wave models, in particular to Boussinesq type systems. We focus mainly on the application of the method to bidirectional nonlinear, dispersive wave propagation in one space dimension. Special emphasis is given to important nonlinear phenomena such as solitary waves interactions.

Dutykh, Denys; Mitsotakis, Dimitrios

2011-01-01T23:59:59.000Z

42

A Comparison of Two Tropical Cyclone Bogussing Schemes  

Science Conference Proceedings (OSTI)

The impact of two bogussing schemes on tropical cyclone (TC) forecasts is compared. One scheme for bogussing TCs into the initial conditions of the nonhydrostatic version of the fifth-generation Pennsylvania State UniversityNational Center for ...

Dongliang Wang; Xudong Liang; Ying Zhao; Bin Wang

2008-02-01T23:59:59.000Z

43

Evaluation of the Ensemble Transform Analysis Perturbation Scheme at NRL  

Science Conference Proceedings (OSTI)

The ensemble transform (ET) scheme changes forecast perturbations into analysis perturbations whose amplitudes and directions are consistent with a user-provided estimate of analysis error covariance. A practical demonstration of the ET scheme ...

Justin G. McLay; Craig H. Bishop; Carolyn A. Reynolds

2008-03-01T23:59:59.000Z

44

Error Determination of a Successive Correction Type Objective Analysis Scheme  

Science Conference Proceedings (OSTI)

The Purdue Regional Objective Analysis of the Mesoscale (PROAM) is a successive correction type scheme for the analysis of surface meteorological data. The scheme is subjected to a series of experiments to evaluate its performance under a variety ...

David R. Smith; Fred W. Leslie

1984-06-01T23:59:59.000Z

45

Evaluation of multiple dynamic initialization schemes for tropical cyclone prediction  

Science Conference Proceedings (OSTI)

Three different dynamic initialization schemes for tropical cyclone (TC) prediction in numerical prediction systems are described and evaluated. The first scheme involves the removal of the analyzed vortex, followed by insertion of a dynamically-...

Eric A. Hendricks; Melinda S. Peng; Tim Li

46

Impact of Transport Schemes on Modeled Dust Concentrations  

Science Conference Proceedings (OSTI)

A sensitivity study is performed with the CHIMERE-DUST chemistry transport model in order to evaluate the modeled mineral dust spread due to the horizontal transport scheme accuracy. Three different schemes are implemented in the model: the ...

Maria Raffaella Vuolo; Laurent Menut; Hlne Chepfer

2009-06-01T23:59:59.000Z

47

An Improved Modeling Scheme for Freezing Precipitation Forecasts  

Science Conference Proceedings (OSTI)

To improve forecasts of various weather elements (snow, rain, and freezing precipitation) in numerical weather prediction models, a new mixed-phase cloud scheme has been developed. The scheme is based on a single prognostic equation for total ...

Andr Tremblay; Anna Glazer

2000-05-01T23:59:59.000Z

48

Handcung Big Brother: An Abuse-Resilient Transaction Escrow Scheme  

E-Print Network (OSTI)

of a transaction escrow scheme utilizing a simple and e?cient VRF family secure under the DDH assumption

Shmatikov, Vitaly

49

Animation projects in CS1 from scheme to Java  

Science Conference Proceedings (OSTI)

Scheme animation projects are transformed into Java projects. Keywords: computer science for liberal arts, introductory programming course, java programming

Mirela Djordjevi?

2011-06-01T23:59:59.000Z

50

Cooperative Schemes for Underwater Acoustic Communications (AQU 3)  

E-Print Network (OSTI)

Cooperative Schemes for Underwater Acoustic CommunicationsIntroduction: Underwater Cooperative CommunicationsMotivation Traditional underwater communications Used for

Madhavan Vajapeyam; Satish Vedantam; Urbashi Mitra

2006-01-01T23:59:59.000Z

51

Analysis and design of a secure key exchange scheme  

Science Conference Proceedings (OSTI)

We propose a new key exchange scheme where the secret key is obtained by multiplying the powers of block upper triangular matrices. After studying the cryptographic properties of these block matrices, the theoretical aspects of this scheme are analyzed, ... Keywords: Block matrices, Cryptography, Discrete logarithm problem, Key exchange scheme, Public key, Quick exponentiation, Security, Triangular matrices

Rafael lvarez; Leandro Tortosa; Jos-Fco Vicent; Antonio Zamora

2009-05-01T23:59:59.000Z

52

Two secret sharing schemes based on Boolean operations  

Science Conference Proceedings (OSTI)

Traditional secret sharing schemes involve complex computation. A visual secret sharing (VSS) scheme decodes the secret without computation, but each shadow is m times as big as the original. Probabilistic VSS solved the computation complexity and space ... Keywords: Computation complexity, Pixel expansion, Secret sharing scheme, Visual cryptography, Visual secret sharing

Daoshun Wang; Lei Zhang; Ning Ma; Xiaobo Li

2007-10-01T23:59:59.000Z

53

An improved anonymous authentication and key exchange scheme  

Science Conference Proceedings (OSTI)

Nowadays, anonymity property of user authentication scheme becomes important. In 2003, Park et al. proposed an authentication and key exchange scheme using smart card. However, Juang et al. pointed out that Park et al.'s scheme did not provide the user ...

Kyung-kug Kim; Myung-Hwan Kim

2012-09-01T23:59:59.000Z

54

Hybrid Scheme for Three-Dimensional Advective Transport  

Science Conference Proceedings (OSTI)

A 3D hybrid (H) transport scheme has been developed that consists of the Prather (P) scheme for vertical transport and a semi-Lagrangian (SL) scheme for horizontal transport on a spherical surface. Two tests have also been developed to permit ...

Vladimir A. Zubov; Eugene V. Rozanov; Michael E. Schlesinger

1999-06-01T23:59:59.000Z

55

Cryptanalysis of UCLA Watermarking Schemes for Intellectual Property Protection  

Science Conference Proceedings (OSTI)

We analyze four recently proposed watermarking schemes for intellectual property protection of digital designs.The first scheme watermarks solutions of a hard optimization problem, namely the graph coloring problem.Th e other three schemes belong to ... Keywords: cryptanalysis, watermark analysis, watermarking

Tri Van Le; Yvo Desmedt

2002-10-01T23:59:59.000Z

56

A Hybrid Second Order Scheme for Shallow Water Flows  

Science Conference Proceedings (OSTI)

We extend the well-balanced second order hybrid scheme developed in Donat and Martinez-Gavara (J. Sci. Comput., to appear) to the one-dimensional and two-dimensional shallow water system. We show that the scheme is exactly well-balanced for quiescent ... Keywords: C-property, Hyperbolic balance laws, Well-balanced schemes

A. Martinez-Gavara; R. Donat

2011-07-01T23:59:59.000Z

57

Conservative Scheme for the Compressible Nonhydrostatic Models with the Horizontally Explicit and Vertically Implicit Time Integration Scheme  

Science Conference Proceedings (OSTI)

A new dynamical scheme with the conservative forms of the equations of density, momentum, and internal energy is proposed for the nonhydrostatic models. With this scheme, the conservations of the mass and the total energy are satisfied within ...

Masaki Satoh

2002-05-01T23:59:59.000Z

58

Dirac Gluinos in the Pyramid Scheme  

E-Print Network (OSTI)

I point out several terms in the low energy effective Lagrangian of the Pyramid Scheme, which were missed in a previous analysis of the phenomenological consequences of the model. They lead to a Dirac contribution to the gluino mass, much larger than the one loop Majorana mass. The gluino can thus be much heavier than in previous estimates, without introducing corresponding large loop corrections to squark masses. As pointed out by a number of authors, this ameliorates the tension between the predictions of the model, and LHC data. I also point out that the model has corrections to the Higgs potential, both at the tree and loop levels, which may ameliorate fine tuning.

T. Banks

2013-11-18T23:59:59.000Z

59

Simplified scheme or radioactive plume calculations  

SciTech Connect

A simplified mathematical scheme to estimate external whole-body $gamma$ radiation exposure rates from gaseous radioactive plumes was developed for the Rio Blanco Gas Field Nuclear Stimulation Experiment. The method enables one to calculate swiftly, in the field, downwind exposure rates knowing the meteorological conditions and $gamma$ radiation exposure rates measured by detectors positioned near the plume source. The method is straightforward and easy to use under field conditions without the help of mini-computers. It is applicable to a wide range of radioactive plume situations. It should be noted that the Rio Blanco experiment was detonated on May 17, 1973, and no seep or release of radioactive material occurred. (auth)

Gibson, T.A.; Montan, D.N.

1976-11-21T23:59:59.000Z

60

Sklyanin algebras and Hilbert schemes of points  

E-Print Network (OSTI)

We construct projective moduli spaces for torsion-free sheaves on noncommutative projective planes. These moduli spaces vary smoothly in the parameters describing the noncommutative plane and have good properties analogous to those of moduli spaces of sheaves over the usual (commutative) projective plane P^2. The generic noncommutative plane corresponds to the Sklyanin algebra S constructed from an automorphism sigma of infinite order on an elliptic curve E < P^2. In this case, the fine moduli space of line bundles over S with first Chern class zero and Euler characteristic (1-n) provides a symplectic variety that is a deformation of the Hilbert scheme of n points on P^2 - E.

T. A. Nevins; J. T. Stafford

2003-10-03T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Numerical Schemes for Rough Parabolic Equations  

SciTech Connect

This paper is devoted to the study of numerical approximation schemes for a class of parabolic equations on (0,1) perturbed by a non-linear rough signal. It is the continuation of Deya (Electron. J. Probab. 16:1489-1518, 2011) and Deya et al. (Probab. Theory Relat. Fields, to appear), where the existence and uniqueness of a solution has been established. The approach combines rough paths methods with standard considerations on discretizing stochastic PDEs. The results apply to a geometric 2-rough path, which covers the case of the multidimensional fractional Brownian motion with Hurst index H>1/3.

Deya, Aurelien, E-mail: deya@iecn.u-nancy.fr [Universite de Nancy 1, Institut Elie Cartan Nancy (France)

2012-04-15T23:59:59.000Z

62

Implementaion and performance of checkpointing schemes in a distributed environment  

E-Print Network (OSTI)

The use of distributed systems has become increasingly popular due to increased computing power, reliability, availability, and efficiency in processing. Checkpointing and rollback recovery is a well known technique used to restore a system from failures. Checkpointing schemes have been classified into two categories namely, coordinated checkpointing schemes and independent checkpointing schemes. The objective of this thesis is to compare the performance of both categories. [4] is chosen as the representative for the coordinated schemes and [21 and [3] are chosen for the independent checkpointing. A distributed application is simulated on a subnet of nine SUN Sparc Stations and performance of checkpointing schemes is measured by varying the number of messages, checkpoint size, and checkpoint interval in the application. Analysis of variation (ANOVA) and Tukey-Kramer Comparison Test are performed on the results. We conclude that the coordinated scheme performs equally well as the independent scheme(s) when the number of messages in the system is low. However, with increased number of messages, performance of the coordinated scheme degrades significantly over that of the independent scheme(s). Also, checkpoint size and checkpoint interval do not have a statistically significant influence (p>0.05) on the performance.

Soni, Sameer

1994-01-01T23:59:59.000Z

63

An efficient compression scheme for bitmap indices  

Science Conference Proceedings (OSTI)

When using an out-of-core indexing method to answer a query, it is generally assumed that the I/O cost dominates the overall query response time. Because of this, most research on indexing methods concentrate on reducing the sizes of indices. For bitmap indices, compression has been used for this purpose. However, in most cases, operations on these compressed bitmaps, mostly bitwise logical operations such as AND, OR, and NOT, spend more time in CPU than in I/O. To speedup these operations, a number of specialized bitmap compression schemes have been developed; the best known of which is the byte-aligned bitmap code (BBC). They are usually faster in performing logical operations than the general purpose compression schemes, but, the time spent in CPU still dominates the total query response time. To reduce the query response time, we designed a CPU-friendly scheme named the word-aligned hybrid (WAH) code. In this paper, we prove that the sizes of WAH compressed bitmap indices are about two words per row for large range of attributes. This size is smaller than typical sizes of commonly used indices, such as a B-tree. Therefore, WAH compressed indices are not only appropriate for low cardinality attributes but also for high cardinality attributes.In the worst case, the time to operate on compressed bitmaps is proportional to the total size of the bitmaps involved. The total size of the bitmaps required to answer a query on one attribute is proportional to the number of hits. These indicate that WAH compressed bitmap indices are optimal. To verify their effectiveness, we generated bitmap indices for four different datasets and measured the response time of many range queries. Tests confirm that sizes of compressed bitmap indices are indeed smaller than B-tree indices, and query processing with WAH compressed indices is much faster than with BBC compressed indices, projection indices and B-tree indices. In addition, we also verified that the average query response time is proportional to the index size. This indicates that the compressed bitmap indices are efficient for very large datasets.

Wu, Kesheng; Otoo, Ekow J.; Shoshani, Arie

2004-04-13T23:59:59.000Z

64

CX-000104: Categorical Exclusion Determination | Department of...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Determination Pedro Bay Native Village Technical Consulting Services for Mini Hydropower Feasibility Study CX(s) Applied: A9, A11 Date: 12042009 Location(s): Alaska...

65

Page not found | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Exclusion Determination Pedro Bay Native Village Technical Consulting Services for Mini Hydropower Feasibility Study CX(s) Applied: A9, A11 Date: 12042009 Location(s): Alaska...

66

Categorical Exclusion Determinations: A11 | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Exclusion Determination Pedro Bay Native Village Technical Consulting Services for Mini Hydropower Feasibility Study CX(s) Applied: A9, A11 Date: 12042009 Location(s): Alaska...

67

Alaska | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Exclusion Determination Pedro Bay Native Village Technical Consulting Services for Mini Hydropower Feasibility Study CX(s) Applied: A9, A11 Date: 12042009 Location(s): Alaska...

68

Categorical Exclusion Determinations: Native American and Alaskan...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Exclusion Determination Pedro Bay Native Village Technical Consulting Services for Mini Hydropower Feasibility Study CX(s) Applied: A9, A11 Date: 12042009 Location(s): Alaska...

69

Complexity of Snow Schemes in a Climate Model and Its Impact on Surface Energy and Hydrology  

Science Conference Proceedings (OSTI)

Three different complexity snow schemes implemented in the ECMWF land surface scheme Hydrology Tiled ECMWF Scheme of Surface Exchanges over Land (HTESSEL) are evaluated within the EC-EARTH climate model. The snow schemes are (i) the original ...

Emanuel Dutra; Pedro Viterbo; Pedro M. A. Miranda; Gianpaolo Balsamo

2012-04-01T23:59:59.000Z

70

A flexible location management scheme for mobile computing  

E-Print Network (OSTI)

Location management for mobile users is an important issue in distributed, mobile computing environments. In this thesis, I propose a flexible location management scheme on the Internet to support mobile users. The proposed scheme supports location search and update operations based on a data replication technique. I implemented the proposed scheme as an experimental prototype using ORACLE Distributed Database Management System (DDBMS), where two clients access independent database objects on one server to simulate the behavior of a distributed system.

Zhang, Ying

1996-01-01T23:59:59.000Z

71

A Linear Algebraic Approach to Metering Schemes \\Lambda  

E-Print Network (OSTI)

A Linear Algebraic Approach to Metering Schemes \\Lambda Carlo Blundo 1 , Sebasti`a Mart'in 2,matcplg@mat.upc.es October 26, 2001 Abstract A metering scheme is a method by which an audit agency is able to measure metering schemes where any server is able to compute a proof, i.e., a value to be shown to the audit agency

International Association for Cryptologic Research (IACR)

72

Scheme-Independent Predictions in QCD: Commensurate Scale Relations and Physical Renormalization Schemes  

SciTech Connect

Commensurate scale relations are perturbative QCD predictions which relate observable to observable at fixed relative scale, such as the ''generalized Crewther relation'', which connects the Bjorken and Gross-Llewellyn Smith deep inelastic scattering sum rules to measurements of the e{sup +}e{sup {minus}} annihilation cross section. All non-conformal effects are absorbed by fixing the ratio of the respective momentum transfer and energy scales. In the case of fixed-point theories, commensurate scale relations relate both the ratio of couplings and the ratio of scales as the fixed point is approached. The relations between the observables are independent of the choice of intermediate renormalization scheme or other theoretical conventions. Commensurate scale relations also provide an extension of the standard minimal subtraction scheme, which is analytic in the quark masses, has non-ambiguous scale-setting properties, and inherits the physical properties of the effective charge {alpha}{sub V}(Q{sup 2}) defined from the heavy quark potential. The application of the analytic scheme to the calculation of quark-mass-dependent QCD corrections to the Z width is also reviewed.

Brodsky, Stanley J.

1998-12-04T23:59:59.000Z

73

Energy Supplier Obligations and White Certificate Schemes: Comparative...  

Open Energy Info (EERE)

Certificate Schemes: Comparative Analysis of Results in the European Union Focus Area: Energy Efficiency Topics: Socio-Economic Website: eec.ucdavis.eduACEEE2010datapapers...

74

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...

75

A Secure and Private Communication Scheme for Smart Grid ...  

A Secure and Private Communication Scheme for Smart Grid Components Contact Information: ... Contact us for more information regarding this exciting new technology.

76

convergence of string-averaging projection schemes for inconsistent ...  

E-Print Network (OSTI)

Aug 4, 2003 ... out proof) an algorithmic scheme which generalizes both the string- ... Projecting along each string is sequential, but the strings are inM.

77

Biofuels Sustainability Certification Schemes: Challenges, Feasibility and Possible Approaches.  

E-Print Network (OSTI)

??The focus of this research is to develop and apply an analytical framework for evaluating the effectiveness and practicability of sustainability certification schemes for biofuels, (more)

Visconti, Gloria and#60;1971and#62

2010-01-01T23:59:59.000Z

78

A GPU Cluster Optimized Multigrid Scheme for Computing Unsteady ...  

Science Conference Proceedings (OSTI)

... 2h grid hierarchy is replaced with a two level scheme, where the restriction length ... Smart Use of Density Functional Theory Calculations to Drive Newtonian...

79

Certificateless Encryption Schemes Strongly Secure in the Standard ...  

Science Conference Proceedings (OSTI)

encryption (CLE) schemes that are provably secure against strong adver- ... of a number of alternative security models for CLE that are substantially weaker.

80

A new approach applied to adaptive centralized load shedding scheme  

Science Conference Proceedings (OSTI)

One of major contingencies of an electric power system is due to imbalance between loads and generated power. This leads to instability in the power system and hence to a blackout. A load shedding scheme may be used to avoid such problem by reducing ... Keywords: adaptive load shedding scheme, critical power, power system, threshold power

Hamid Bentarzi; Abderrahmane Ouadi; Nadir Ghout; Farid Maamri; Nikos E. Mastorakis

2009-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

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

82

Prediction of Graupel Density in a Bulk Microphysics Scheme  

Science Conference Proceedings (OSTI)

A method to predict the bulk density of graupel ?g has been added to the two-moment MilbrandtYau bulk microphysics scheme. The simulation of graupel using the modified scheme is illustrated through idealized simulations of a mesoscale convective ...

Jason A. Milbrandt; Hugh Morrison

2013-02-01T23:59:59.000Z

83

An Unconditionally Stable Scheme for the Shallow Water Equations  

Science Conference Proceedings (OSTI)

A finite-difference scheme for solving the linear shallow water equations in a bounded domain is described. Its time step is not restricted by a CourantFriedrichsLevy (CFL) condition. The scheme, known as IsraeliNaikCane (INC), is the ...

Moshe Israeli; Naomi H. Naik; Mark A. Cane

2000-03-01T23:59:59.000Z

84

Application of the GRP scheme to open channel flow equations  

Science Conference Proceedings (OSTI)

The GRP (generalized Riemann problem) scheme, originally conceived for gasdynamics, is reformulated for the numerical integration of the shallow water equations in channels of rectangular cross-section, variable width and bed profile, including a friction ... Keywords: Generalized Riemann problem (GRP), Hydraulic jump, Hyperbolic conservation laws, Open channel, Quasi-1D flow, Second-order scheme, Shallow water

A. Birman; J. Falcovitz

2007-03-01T23:59:59.000Z

85

Efficient zero-knowledge identification schemes which respect privacy  

Science Conference Proceedings (OSTI)

At first glance, privacy and zero-knowledgeness seem to be similar properties. A scheme is private when no information is revealed on the prover and in a zero-knowledge scheme, communications should not leak provers' secrets. Until recently, privacy ... Keywords: identification, privacy, zero-knowledge

Julien Bringer; Herv Chabanne; Thomas Icart

2009-03-01T23:59:59.000Z

86

A timed-release key management scheme for backward recovery  

Science Conference Proceedings (OSTI)

The timed-release encryption scheme is to encrypt a message so that a ciphertext can be decrypted when specific time in the future comes. Recently, interesting constructions of the timed-release encryption scheme have been proposed. The central concept ...

Maki Yoshida; Shigeo Mitsunari; Toru Fujiwara

2005-12-01T23:59:59.000Z

87

An efficient identity-based signature scheme with batch verifications  

Science Conference Proceedings (OSTI)

Mapping messages or a user's identity into a point on elliptic curves is required by many pairing-based cryptographic schemes. In most of pairing-based schemes, this requirement is realized by a special hash function, MapToPoint function. However, ...

Shi Cui; Pu Duan; Choong Wah Chan

2006-05-01T23:59:59.000Z

88

Ban Chao Nen scheme gives economic boost to NW Thailand  

SciTech Connect

A major hydroelectric scheme in northwest Thailand is the first of several that could be developed on the Quae Yai River. Not only will it relieve demand for fossil fuel which would otherwise have to be imported, but it will also provide irrigation and social benefits through a well ordered resettlement scheme for families displaced by the creation of a reservoir.

Bhudraja, P.S.

1976-11-01T23:59:59.000Z

89

EUROPEAN COGENERATION CERTIFICATE TRADING- ECOCERT Demand creation and scheme interactions  

E-Print Network (OSTI)

As interest in market-based domestic mechanisms has increased in the EU, a tradable certificate scheme for CHP is an option. During the period January 2002- April 2003, within the European Cogeneration Certificate Trading (ECoCerT) project, activities have been undertaken in a series of phases to analyse a CHP certificate scheme. The ECoCerT project was financially supported

M. G. Boots

2003-01-01T23:59:59.000Z

90

Multidimensional Flux-Form Semi-Lagrangian Transport Schemes  

Science Conference Proceedings (OSTI)

An algorithm for extending one-dimensional, forward-in-time, upstream-biased, flux-form transport schemes (e.g., the van Leer scheme and the piecewise parabolic method) to multidimensions is proposed. A method is also proposed to extend the ...

Shian-Jiann Lin; Richard B. Rood

1996-09-01T23:59:59.000Z

91

Di usive Kinetic Explicit Schemes for Nonlinear Degenerate Parabolic Systems  

E-Print Network (OSTI)

Di#11;usive Kinetic Explicit Schemes for Nonlinear Degenerate Parabolic Systems #3; D. Aregba parabolic systems. These schemes are based on discrete BGK models where both characteristic velocities. Evje and K.H. Karlsen [15] and of M. Espedal and K.H. Karlsen [14]. For the theory of general parabolic

92

An Auditable Metering Scheme for Web Advertisement Applications  

Science Conference Proceedings (OSTI)

This paper proposes a cryptographic scheme for metering the duration and/or the number of instances of running a process. This scheme has the following property: knowing a secret, one can validate a piece of metering evidence in constant units of time ... Keywords: auditable metering, lightweight security, software, tamper-resistant, web advertisement

Liqun Chen; Wenbo Mao

2001-10-01T23:59:59.000Z

93

Comments on matrix-based secret sharing scheme for images  

Science Conference Proceedings (OSTI)

Several attempts have been made to propose efficient secret sharing schemes for 2D images. Rey M.D (Iberoamerican Congress on Pattern Recognition, 2008) proposed a relatively fast image secret sharing scheme based on simple binary matrix operations. ... Keywords: cryptanalysis, image processing, secret sharing

Esam Elsheh; A. Ben Hamza

2010-11-01T23:59:59.000Z

94

Hierarchical Control Scheme for Voltage Unbalance Compensation in Islanded Microgrids  

E-Print Network (OSTI)

Hierarchical Control Scheme for Voltage Unbalance Compensation in Islanded Microgrids Mehdi@et.aau.dk Abstract-- The concept of microgrid hierarchical control is presented, recently. In this paper, a hierarchical scheme which includes primary and secondary control levels is proposed for islanded microgrids

Vasquez, Juan Carlos

95

Distributed scheduling schemes for wireless mesh networks: A survey  

Science Conference Proceedings (OSTI)

An efficient scheduling scheme is a crucial part of Wireless Mesh Networks (WMNs)an emerging communication infrastructure solution for autonomy, scalability, higher throughput, lower delay metrics, energy efficiency, and other service-level guarantees. ... Keywords: Wireless mesh networks, ad hoc networks, cyclic access, distributed scheduling schemes, pseudo-random access, random access

Kanthaiah Sivapragasam Vijayalayan, Aaron Harwood, Shanika Karunasekera

2013-10-01T23:59:59.000Z

96

Security Schemes for Wireless Sensor Networks with Mobile Sink  

E-Print Network (OSTI)

Mobile sinks are vital in many wireless sensor applications for efficient data collection, data querying, and localized sensor reprogramming. Mobile sinks prolong the lifetime of a sensor network. However, when sensor networks with mobile sinks are deployed in a hostile environment, security became a critical issue. They become exposed to varieties of malicious attacks. Thus, anti threats schemes and security services, such as mobile sink?s authentication and pairwise key establishment, are essential components for the secure operation of such networks. Due to the sensors, limited resources designing efficient security schemes with low communication overhead to secure communication links between sensors and MS (Mobile Sink) is not a trivial task. In addition to the sensors limited resources, sink mobility required frequent exchange of cryptography information between the sensors and MS each time the MS updates its location which imposes extra communication overhead on the sensors. In this dissertation, we consider a number of security schemes for WSN (wireless sensor network) with MS. The schemes offer high network?s resiliency and low communication overhead against nodes capture, MS replication and wormhole attacks. We propose two schemes based on the polynomial pool scheme for tolerating nodes capture: the probabilistic generation key pre-distribution scheme combined with polynomial pool scheme, and the Q-composite generation key scheme combined with polynomial pool scheme. The schemes ensure low communication overhead and high resiliency. For anti MS replication attack scheme, we propose the multiple polynomial pools scheme that provide much higher resiliency to MS replication attack as compared to the single polynomial pool approach. Furthermore, to improve the network resiliency against wormhole attack, two defensive mechanisms were developed according to the MS mobility type. In the first technique, MS uses controlled mobility. We investigate the problem of using a single authentication code by sensors network to verify the source of MS beacons, and then we develop a defensive approach that divide the sensor network into different authentication code?s grids. In the second technique, random mobility is used by MS. We explore the use of different communication channels available in the sensor hardware combined with polynomial pool scheme.

Rasheed, Amar Adnan

2010-05-01T23:59:59.000Z

97

Utility Energy Efficiency Schemes: Savings Obligations and Trading  

Open Energy Info (EERE)

Utility Energy Efficiency Schemes: Savings Obligations and Trading Utility Energy Efficiency Schemes: Savings Obligations and Trading **Subscription Required** Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Utility Energy Efficiency Schemes: Savings Obligations and Trading **Subscription Required** Focus Area: Energy Efficiency, - Utility Topics: Policy Impacts Website: dx.doi.org/10.1007/s12053-008-9024-8 Equivalent URI: cleanenergysolutions.org/content/utility-energy-efficiency-schemes-sav Language: English Policies: "Financial Incentives,Regulations" is not in the list of possible values (Deployment Programs, Financial Incentives, Regulations) for this property. Regulations: Mandates/Targets This paper attempts to answer the following questions: What is new about the recent raft of white certificate energy efficiency schemes and is there

98

Testing Statistical Cloud Scheme Ideas in the GFDL Climate Model  

NLE Websites -- All DOE Office Websites (Extended Search)

Testing Statistical Cloud Scheme Ideas in the GFDL Climate Model Testing Statistical Cloud Scheme Ideas in the GFDL Climate Model Klein, Stephen Lawrence Livermore National Laboratory Pincus, Robert NOAA-CIRES Climate Diagnostics Center Category: Modeling Statistical cloud schemes (or assumed probability distribution function cloud schemes) are attractive because they provide a way to implement horizontal sub-grid scale cloud heterogeneity in a self-consistent way between physical parameterizations of the a climate model, such as radiation and cloud microphysics. In this work, we will present results dealing with two aspects of our ongoing work towards the implementation of statistical cloud scheme ideas in the climate model of Geophysical Fluid Dynamics Laboratory. First, we will address the representation of cloud

99

Secret color images sharing schemes based on XOR operation  

E-Print Network (OSTI)

s paper presents two new constructi ons for the secret colori mages shari ng schemes .Onei s a (n, n) th eshold scheme, whi ch can be const ucted based on XOR ope ati on. The othe i s a (2, n) th eshold scheme, whi ch can be const ucted by usi ng AND and XOR ope ati ons. The two schemes have no pi xel expansi on, and the ti me complexi ty fo const ucti ng sha ed i mages i s O(k 1 n), excludi ng the ti me needed fo gene ati ng n di sti nct andom mati ces (he e k si ze of the sharedi mage). The reconstructed i mages can be obtai nedi n the two schemes by usi ng the XOR operati on alone. The relati vedi fferences of the two schemes are 1 and 1/2, respecti vely. The ti me complexi ty of the recoveredi magesi s O(k 1 n) and O(2k 1 ), especti vely. The two schemes also povi de pe fect sec ecy. Keywo ds: Sec et shai ng scheme; Vi sual c yptog aphy; Vi sual sec et shai ng scheme; XOR ope ati on; Pe fect sec ecy 1. Int oduction Afte Blakely and Shami i ndependently p oposed the (k, n) th eshold scheme [1-2], hund eds of pape s we e publi shed epo ti ng esea ch about thi s topi c. Howeve , these schemes a e only sui table fo di gi tal data such as text fi les, passwo ds, and enc ypti on / Correspondi ng author. Tel.: +86-10-62782930 E-mai l address: daoshun@mai l.tsi nghua.edu.cn decrypti on keys [3]. Compared wi thdi gi tal data such as passwords and text fi les,di gi tal i mages have a large amount of datum, and the di fference between two nei ghbori ng datum i s very small. Because of the features ofdi gi tali mages,i ti si mpracti cal to apply the tradi ti onal threshold scheme to share a secretdi gi tali magedi rectly, soi ti s veryi mportant and necessary toi nvesti gate (k, n) th eshold schemes of di gi tal i mages. In [3], the Chang and Hwang p ...

Wang Dao-Shun; Zhang Lei; Ma Ning; Huang Lian-Sheng; Bei Ji

2005-01-01T23:59:59.000Z

100

Village adoption scheme : a model for rural development  

E-Print Network (OSTI)

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 ...

Nanavati, Shahid Sadruddin, 1961-

2004-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Estimating Plume Dispersion-A Comparison of Several Sigma Schemes  

Science Conference Proceedings (OSTI)

The lateral and vertical Gaussian plume dispersion parameters are estimated and compared with fieldtracer data collected at II sites. The dispersion parameter schemes used in this analysis include Cramer'sscheme, suggested for tall stack ...

John S. Irwin

1983-01-01T23:59:59.000Z

102

Mass Correction Applied to Semi-Lagrangian Advection Scheme  

Science Conference Proceedings (OSTI)

A simple mass correction is proposed for the semi-Lagrangian scheme using forward trajectories. The procedure includes (a) constructing the Lagrangian network induced by the motion of the fluid from the Eulerian network and finding the ...

Wen-Yih Sun; Ming-Teh Sun

2004-04-01T23:59:59.000Z

103

A Nonoscillatory Discontinuous Galerkin Transport Scheme on the Cubed Sphere  

Science Conference Proceedings (OSTI)

The discontinuous Galerkin (DG) method is high order, conservative, and offers excellent parallel efficiency. However, when there are discontinuities in the solution, the DG transport scheme generates spurious oscillations that reduce the quality ...

Yifan Zhang; Ramachandran D. Nair

2012-09-01T23:59:59.000Z

104

Towards an Emissions Trading Scheme for Air Pollutants in India  

E-Print Network (OSTI)

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 ...

Duflo, Esther

105

An Accuracy Progressive Sixth-Order Finite-Difference Scheme  

Science Conference Proceedings (OSTI)

How to reduce the computational error is a key issue in numerical modeling and simulation. The higher the order of the difference scheme, the less the truncation error and the more complicated the computation. For compromise, a simple, three-...

Peter C. Chu; Chenwu Fan

2001-07-01T23:59:59.000Z

106

Dependency-Directed Backtracking in Non-Deterministic Scheme  

E-Print Network (OSTI)

Non-deterministic LISP can be used to describe a search problem without specifying the method used to solve the problem. We show that SCHEMER, a non-deterministic dialect of SCHEME, can support dependency-directed backtracking ...

Zabih, Ramin

107

Semiprognostic Tests of Cumulus Parameterization Schemes in the Middle Latitudes  

Science Conference Proceedings (OSTI)

In this paper, we consider three disparate classes of cumulus parameterization schemes, applied to cases of severe midlatitude convective storms observed during SESAME-1979. Objective analysis of the observed data was carded out and verifying ...

Georg A. Grell; Ying-Hwa Kuo; Richard J. Pasch

1991-01-01T23:59:59.000Z

108

A lightweight content replication scheme for mobile ad hoc environments  

E-Print Network (OSTI)

is based on a Time-To-Live (TTL) search. In our scheme, theincluded in the packet. The TTL value of the probe packet isin the current set, i.e. , TTL = max (hi), where hi e S. To

Thanedar, V; Almeroth, K C; Belding-Royer, E M

2004-01-01T23:59:59.000Z

109

A Hybrid Ensemble Kalman Filter3D Variational Analysis Scheme  

Science Conference Proceedings (OSTI)

A hybrid ensemble Kalman filterthree-dimensional variational (3DVAR) analysis scheme is demonstrated using a quasigeostrophic model under perfect-model assumptions. Four networks with differing observational densities are tested, including one ...

Thomas M. Hamill; Chris Snyder

2000-08-01T23:59:59.000Z

110

Auxiliary power controls on the Nelson River HVDC scheme  

SciTech Connect

This paper describes the auxiliary power controls on the Nelson River HVDC scheme. It shows how the fast control feature of the HVDC link can be utilized to enhance the operation of an integrated ac/dc power system.

Chand, J. (Manitoba Hydro, Winnipeg, Manitoba (CA))

1992-02-01T23:59:59.000Z

111

Compatibility of weak rigidity with some types of elastic schemes  

SciTech Connect

The behavior of the hypoelastic-Synge, hypoelastic-Maugin, and hypoelastic-Carter and Quintana almost-thermodynamic material schemes, under weak rigidity hypotheses, is studied. In every case, the absence of principal transverse shock waves (or the vanishing of the corresponding speeds) is obtained. The same result follows for the longitudinal shock waves when the Lame coefficient ..mu.. does not vanish. A definition of an elastic almost-thermodynamic material scheme based on the Fermi--Walker transport is proposed and compared with the above elastic schemes. The speeds of the principal shock waves associated are attained and its compatibility with the Ferrando--Olivert incompressibility condition is proved. In the presence of weak rigidity the elastic schemes here defined lead (assuming ..mu..not =0) to the Born-rigidity condition.

del Olmo, V.; Olivert, J.

1986-04-01T23:59:59.000Z

112

A Semi-Lagrangian Transport Scheme with Spectral Interpolation  

Science Conference Proceedings (OSTI)

Advective transport using the flexible and stable semi-Lagrangian scheme coupled with the highly accurate spectral interpolation in a limited domain is demonstrated. The spectral method for solving nonperiodic boundary problems is based on a ...

H. N. Lee

1993-12-01T23:59:59.000Z

113

Accuracy of Multiply-Upstream, Semi-Lagrangian Advective Schemes  

Science Conference Proceedings (OSTI)

The stability and accuracy of the multiply-upstream, semi-Lagrangian method of integrating the advective equation in two dimensions is examined for four different interpolation schemes; namely, bilinear, biquadratic, bicubic and biquartic. All ...

A. McDonald

1984-06-01T23:59:59.000Z

114

Eliminating the Interpolation Associated with the Semi-Lagrangian Scheme  

Science Conference Proceedings (OSTI)

There are several reasons why it is desirable to eliminate the interpolation associated with the conventional semi-Larangian scheme. Interpolation leads to smoothing and is also the most costly operation associated with the technique. Furthermore,...

Harold Ritchie

1986-01-01T23:59:59.000Z

115

Passive-Microwave-Enhanced Statistical Hurricane Intensity Prediction Scheme  

Science Conference Proceedings (OSTI)

The formulation and testing of an enhanced Statistical Hurricane Intensity Prediction Scheme (SHIPS) using new predictors derived from passive microwave imagery is presented. Passive microwave imagery is acquired for tropical cyclones in the ...

Thomas A. Jones; Daniel Cecil; Mark DeMaria

2006-08-01T23:59:59.000Z

116

Stable Schemes for Nonlinear Vertical Diffusion in Atmospheric Circulation Models  

Science Conference Proceedings (OSTI)

The intensity of vertical mixing in atmospheric models generally depends on wind shear and static stability, making the diffusion process nonlinear. Traditional implicit numerical schemes, which treat the variables to be diffused implicitly but ...

Claude Girard; Yves Delage

1990-03-01T23:59:59.000Z

117

Semi-Lagrangian Advection Schemes and Eulerian WKL Algorithms  

Science Conference Proceedings (OSTI)

Several advection experiments were conducted to test semi-Lagrangian schemes and Eulerian Warming-Kutler-Lomax (WKL) algorithms. The Eulerian WKL algorithms, as a special case of fourth-degree (order) Lagrange interpolation, exhibit unacceptable ...

Ching-Yuang Huang

1994-07-01T23:59:59.000Z

118

SEER: scalable energy efficient relay schemes in MANETs  

Science Conference Proceedings (OSTI)

In Mobile Ad Hoc Networks (MANETs), broadcasting is widely used to support many applications. Several adaptive broadcast schemes have been proposed to reduce the number of rebroadcasting, and can consequently reduce the chance of contention and ...

Lin-Fei Sung; Cheng-Lin Wu; Yi-Kai Chiang; Shyh-In Hwang

2006-08-01T23:59:59.000Z

119

On the Security of Liaw et al.'s Scheme  

E-Print Network (OSTI)

Recently, Liaw et al. proposed a remote user authentication scheme using smartcards. They claimed a number of features of their scheme, e.g. a dictionary of verification tables is not required to authenticate users; users can choose their password freely; mutual authentication is provided between the user and the remote system; the communication cost and the computational cost are very low; users can update their password after the registration phase; a session key agreed by the user and the remote system is generated in every session; and the nonce-based scheme which does not require a timestamp (to solve the serious time synchronization problem) etc. In this paper We show that Liaw et al.'s scheme does not stand with various security requirements and is completely insecure. Keywords: Authentication, Smartcards, Remote system, Attack.

Awasthi, Amit K

2008-01-01T23:59:59.000Z

120

An Incremental Remapping Transport Scheme on a Spherical Geodesic Grid  

Science Conference Proceedings (OSTI)

Weather and climate models contain equations for transporting conserved quantities such as the mass of air, water, ice, and associated tracers. Ideally, the numerical schemes used to solve these equations should be conservative, spatially ...

William H. Lipscomb; Todd D. Ringler

2005-08-01T23:59:59.000Z

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121

A Simple Comparison of Four PhysicsDynamics Coupling Schemes  

Science Conference Proceedings (OSTI)

Four schemes (referred to here as explicit, implicit, split-implicit, and symmetrized split-implicit) for coupling physics parameterizations to the dynamical core of numerical weather and climate prediction models have been studied in the context ...

Andrew Staniforth; Nigel Wood; Jean Ct

2002-12-01T23:59:59.000Z

122

A Simple Positive Definite Advection Scheme with Small Implicit Diffusion  

Science Conference Proceedings (OSTI)

The development of negative values for positive definite scalars in the solution of the advection equation is an important difficulty in numerical modeling. This paper proposes a new positively definite advection scheme which has a simple form, ...

Piotr K. Smolarkiewicz

1983-03-01T23:59:59.000Z

123

The Project for Intercomparison of Land-surface Parameterization Schemes  

Science Conference Proceedings (OSTI)

The Project for Intercomparison of Land-surface Parameterization Schemes (PILPS) is described and the first stage science plan outlined. PILPS is a project designed to improve the parameterization of the continental surface, especially the ...

A. Henderson-Sellers; Z-L. Yang; R. E. Dickinson

1993-07-01T23:59:59.000Z

124

Defining Marine Boundary Layer Clouds with a Prognostic Scheme  

Science Conference Proceedings (OSTI)

A prognostic cloud scheme is described based on Tiedtke's cloud parameterization for large-scale meteorological models, which uses prognostic equations for both mean liquid water content and cloud fraction. The present work parameterizes the ...

Shouping Wang

1996-08-01T23:59:59.000Z

125

Locally Decodable Codes and Private Information Retrieval Schemes  

E-Print Network (OSTI)

This thesis studies two closely related notions, namely Locally Decodable Codes (LDCs) and Private Information Retrieval Schemes (PIRs). Locally decodable codes are error-correcting codes that allow extremely efficient, ...

Yekhanin, Sergey

2007-01-01T23:59:59.000Z

126

Cost Benefit Evaluation of HP Turbine Admission Schemes  

Science Conference Proceedings (OSTI)

The scheme used to position the control valves that admit steam to high-pressure turbines has a direct effect on the turbines performance. This report describes the two most common admission schemes, partial and full arc, and discusses their effects on heat rate, reliability, and cost versus benefit under different loading conditions and modes of operation.BackgroundHistorically, most steam turbines in coal-fired power plants operated in a ...

2012-12-14T23:59:59.000Z

127

Optical packet marking for fast discarding in an OLS scheme  

E-Print Network (OSTI)

We propose and validate experimentally a Time-to-Live signaling system for an Optical Label Swapping scheme based on 10 Gbit/s DPSK packets and with 100 Mbit/s SCM label. The proposed scheme allows fast packet discarding by using a 3.5 GHz sub-carrier tone. DPSK payload has only a 2 dB power penalty at 10 --9 bit error-rate after superimposing the SCM and TTL labeling signal.

Vegas Olmos Tafur

2004-01-01T23:59:59.000Z

128

Weak rigidity in almost-thermodynamic material schemes  

SciTech Connect

To avoid the restrictions that the Born rigidity supposes for the motions in relativity, the definition of a weakly rigid almost-thermodynamic material scheme is proposed. From it the relativistic incompressibility condition given by Ferrando and Olivert is obtained. Moreover, it is proved that, for the weakly rigid irrotational and geodesic almost-thermodynamic material schemes, the scalar curvature of the Landau manifolds is constant along the streamlines.

del Olmo, V.; Olivert, J.

1985-06-01T23:59:59.000Z

129

Conservative Transport Schemes for Spherical Geodesic Grids: High-Order Reconstructions for Forward-in-Time Schemes  

Science Conference Proceedings (OSTI)

The finite-volume transport scheme of Miura, for icosahedralhexagonal meshes on the sphere, is extended by using higher-order reconstructions of the transported scalar within the formulation. The use of second- and fourth-order reconstructions, ...

William C. Skamarock; Maximo Menchaca

2010-12-01T23:59:59.000Z

130

Efficient Conservative Global Transport Schemes for Climate and Atmospheric Chemistry Models  

Science Conference Proceedings (OSTI)

A computationally efficient mass-conservative transport scheme over the sphere is proposed and tested. The scheme combines a conservative finite-volume method with an efficient semi-Lagrangian scheme based on the dimension splitting cascade ...

Ramachandran D. Nair; Jeffrey S. Scroggs; Fredrick H. M. Semazzi

2002-08-01T23:59:59.000Z

131

Application of a Monotonic Upstream-biased Transport Scheme to Three-Dimensional Constituent Transport Calculations  

Science Conference Proceedings (OSTI)

The application of van Leer's scheme, a monotonic, upstream-biased differencing scheme, to three-dimensional constituent transport calculations is shown. The major disadvantage of the scheme is shown to be a self-limiting diffusion. A major ...

Dale J. Allen; Anne R. Douglass; Richard B. Rood; Paul D. Guthrie

1991-10-01T23:59:59.000Z

132

Inherently Conservative Nonpolynomial-Based Remapping Schemes: Application to Semi-Lagrangian Transport  

Science Conference Proceedings (OSTI)

A group of new conservative remapping schemes based on nonpolynomial approximations is proposed. The remapping schemes rely on the conservative cascade scheme (CCS), which employs an efficient sequence of 1D remapping operations to solve a ...

Matthew R. Norman; Ramachandran D. Nair

2008-12-01T23:59:59.000Z

133

Understanding and Forecasting Tropical Cyclone Intensity Change with the Typhoon Intensity Prediction Scheme (TIPS)  

Science Conference Proceedings (OSTI)

A multiple regression scheme with tropical cyclone intensity change as the dependent variable has been developed. The new scheme is titled the Typhoon Intensity Prediction Scheme (TIPS) and is similar to one used operationally at the National ...

Patrick J. Fitzpatrick

1997-12-01T23:59:59.000Z

134

A Class of Single-Cell High-Order Semi-Lagrangian Advection Schemes  

Science Conference Proceedings (OSTI)

A class of semi-Lagrangian schemes has been derived for solving the advection equation. Compared with other semi-Lagrangian-type schemes, the presented schemes require less computational stencils for interpolation construction. Besides the ...

Feng Xiao

2000-04-01T23:59:59.000Z

135

Intercomparison of Spatial Interpolation Schemes for Use in Nested Grid Models  

Science Conference Proceedings (OSTI)

Two geometrical and two advection-equivalent spatial interpolation schemes were tested in providing lateral boundary conditions to a nested grid domain. Geometric interpolation schemes used in this study are a zeroth- order and a quadratic scheme,...

Kiran Alapaty; Rohit Mathur; Talat Odman

1998-01-01T23:59:59.000Z

136

Efficient identity based proxy-signcryption schemes with forward security and public verifiability  

Science Conference Proceedings (OSTI)

Li and Chen proposed an identity based proxy-signcryption scheme which is based on the Libert and Quisquater's identity based signcryption scheme recently. However, we demonstrate that their scheme does not satisfy the strong unforgeability and forward ...

Meng Wang; Hui Li; Zhijing Liu

2005-08-01T23:59:59.000Z

137

The Influence of a CO2 Pricing Scheme on Distributed Energy Resources...  

NLE Websites -- All DOE Office Websites (Extended Search)

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

138

Metropolis Integration Schemes for Self-Adjoint Diffusions  

E-Print Network (OSTI)

We present explicit methods for simulating diffusions whose generator is self-adjoint with respect to a known (but possibly not normalizable) density. These methods exploit this property and combine an optimized Runge-Kutta algorithm with a Metropolis-Hastings Monte-Carlo scheme. The resulting numerical integration scheme is shown to be weakly accurate at finite noise and to gain higher order accuracy in the small noise limit. It also permits to avoid computing explicitly certain terms in the equation, such as the divergence of the mobility tensor, which can be tedious to calculate. Finally, the scheme is shown to be ergodic with respect to the exact equilibrium probability distribution of the diffusion when it exists. These results are illustrated on several examples including a Brownian dynamics simulation of DNA in a solvent. In this example, the proposed scheme is able to accurately compute dynamics at time step sizes that are an order of magnitude (or more) larger than those permitted with commonly used explicit predictor-corrector schemes.

Nawaf Bou-Rabee; Aleksandar Donev; Eric Vanden-Eijnden

2013-09-19T23:59:59.000Z

139

Energy Supplier Obligations and White Certificate Schemes: Comparative  

Open Energy Info (EERE)

Energy Supplier Obligations and White Certificate Schemes: Comparative Energy Supplier Obligations and White Certificate Schemes: Comparative Analysis of Results in the European Union Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Energy Supplier Obligations and White Certificate Schemes: Comparative Analysis of Results in the European Union Focus Area: Energy Efficiency Topics: Socio-Economic Website: eec.ucdavis.edu/ACEEE/2010/data/papers/2178.pdf Equivalent URI: cleanenergysolutions.org/content/energy-supplier-obligations-and-white Language: English Policies: "Regulations,Financial Incentives" is not in the list of possible values (Deployment Programs, Financial Incentives, Regulations) for this property. Regulations: Mandates/Targets This paper examines the ways different European Union (EU) member states,

140

Energy Pyramids: Useful Concepts, Not More Pyramid Schemes | Department of  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Pyramids: Useful Concepts, Not More Pyramid Schemes Pyramids: Useful Concepts, Not More Pyramid Schemes Energy Pyramids: Useful Concepts, Not More Pyramid Schemes February 8, 2010 - 2:40pm Addthis John Lippert At a December holiday party, the host handed me a newspaper clipping and asked me what I thought of the energy pyramid mentioned in the article. I hadn't read the article, so I told him I would read it and get back to him. Of course, when I found time to look into it, I didn't have the article with me. So I decided to do a little research on energy pyramids on the internet. It turns out that I found several variations on the theme, including the one mentioned in the article handed to me by my friend and neighbor, Larry. The Energy Use Pyramid, featured in the Washington Post article Larry asked about, was designed by architects Peter Pfeiffer and Betsy del Monte. It's

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Reactivity Control Schemes for Fast Spectrum Space Nuclear Reactors  

Science Conference Proceedings (OSTI)

Several different reactivity control schemes are considered for future space nuclear reactor power systems. Each of these control schemes uses a combination of boron carbide absorbers and/or beryllium oxide reflectors to achieve sufficient reactivity swing to keep the reactor subcritical during launch and to provide sufficient excess reactivity to operate the reactor over its expected 715 year lifetime. The size and shape of the control system directly impacts the size and mass of the space reactor's reflector and shadow shield

Aaron E. Craft; Jeffrey C. King

2008-01-01T23:59:59.000Z

142

A Key-Distribution Scheme for Wireless Home Automation Networks  

E-Print Network (OSTI)

Wireless home automation networks are one example of how wireless technologies may soon become part of our daily life, yet security in existing products is woefully inadequate. An important problem in this area is the question of secure key distribution. In this paper we present a key-distribution scheme geared towards home automation networks, but applicable to other networks with related properties as well. Our approach uses a decentralized scheme that is designed to work on resource-poor devices, allows easy addition and removal of devices and limits the workload on the end user while guaranteeing the secrecy of the exchanged keys even in the presence of subverted nodes.

Arno Wacker; Timo Heiber; Holger Cermann

2004-01-01T23:59:59.000Z

143

Crab Crossing Schemes and Studies for Electron Ion Collider  

Science Conference Proceedings (OSTI)

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.

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

2011-09-01T23:59:59.000Z

144

Quasi-Lie schemes and Emden--Fowler equations  

E-Print Network (OSTI)

The recently developed theory of quasi-Lie schemes is studied and applied to investigate several equations of Emden type and a scheme to deal with them and some of their generalisations is given. As a first result we obtain t-dependent constants of the motion for particular instances of Emden equations by means of some of their particular solutions. Previously known results are recovered from this new perspective. Finally some t-dependent constants of the motion for equations of Emden type satisfying certain conditions are recovered.

J. F. Cariena; P. G. L. Leach; J. de Lucas

2009-08-16T23:59:59.000Z

145

Design and Analysis of Low Complexity Network Coding Schemes  

E-Print Network (OSTI)

In classical network information theory, information packets are treated as commodities, and the nodes of the network are only allowed to duplicate and forward the packets. The new paradigm of network coding, which was introduced by Ahlswede et al., states that if the nodes are permitted to combine the information packets and forward a function of them, the throughput of the network can dramatically increase. In this dissertation we focused on the design and analysis of low complexity network coding schemes for different topologies of wired and wireless networks. In the first part we studied the routing capacity of wired networks. We provided a description of the routing capacity region in terms of a finite set of linear inequalities. We next used this result to study the routing capacity region of undirected ring networks for two multimessage scenarios. Finally, we used new network coding bounds to prove the optimality of routing schemes in these two scenarios. In the second part, we studied node-constrained line and star networks. We derived the multiple multicast capacity region of node-constrained line networks based on a low complexity binary linear coding scheme. For star networks, we examined the multiple unicast problem and offered a linear coding scheme. Then we made a connection between the network coding in a node-constrained star network and the problem of index coding with side information. In the third part, we studied the linear deterministic model of relay networks (LDRN). We focused on a unicast session and derived a simple capacity-achieving transmission scheme. We obtained our scheme by a connection to the submodular flow problem through the application of tools from matroid theory and submodular optimization theory. We also offered polynomial-time algorithms for calculating the capacity of the network and the optimal coding scheme. In the final part, we considered the multicasting problem in an LDRN and proposed a new way to construct a coding scheme. Our construction is based on the notion of flow for a unicast session in the third part of this dissertation. We presented randomized and deterministic polynomial-time versions of our algorithm.

Tabatabaei-Yazdi, Seyed

2011-08-01T23:59:59.000Z

146

Evaluation of the Soil Model of the HydroThermodynamic SoilVegetation Scheme by Observations and a Theoretically Advanced Numerical Scheme  

Science Conference Proceedings (OSTI)

The soil module of the HydroThermodynamic SoilVegetation Scheme is evaluated by soil temperature observations and independent theoretical numerical results. To gain the latter, a Galerkin weak finite-element (GWFE) scheme is implemented for ...

Balachandrudu Narapusetty; Nicole Mlders

2006-10-01T23:59:59.000Z

147

A direct Eulerian GRP scheme for relativistic hydrodynamics: One-dimensional case  

Science Conference Proceedings (OSTI)

The paper proposes a direct Eulerian generalized Riemann problem (GRP) scheme for one-dimensional relativistic hydrodynamics. It is an extension of the Eulerian GRP scheme for compressible non-relativistic hydrodynamics proposed in [M. Ben-Artzi, J.Q. ... Keywords: Characteristic coordinate, Godunov scheme, Rankine-Hugoniot jump condition, Relativistic hydrodynamics, Riemann invariant, The generalized Riemann problem scheme

Zhicheng Yang; Peng He; Huazhong Tang

2011-09-01T23:59:59.000Z

148

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

Science Conference Proceedings (OSTI)

Both indoor temperature regulation and energy resources management in buildings require the design and the implementation of efficient and readily adaptable control schemes. One can use standard schemes, such as ''on/off'' and PID, or ''advanced'' schemes, ... Keywords: Control scheme, Energy performance of buildings, Hybrid PIDfuzzy, Multi-energy buildings, Thermal comfort

Benjamin Paris; Julien Eynard; Stphane Grieu; Monique Polit

2011-12-01T23:59:59.000Z

149

A New Practical Limited Identity-Based Encryption Scheme  

Science Conference Proceedings (OSTI)

Identity based cryptography was introduced by Shamir in 1984, which avoids the trust problems encountered in the traditional Public Key Infrastructures. After Boneh and Franklin proposed the first full functional identity based encryption scheme from ... Keywords: Chosen-plaintext security, Email system, Identity based cryptography, Limited identity based encryption

Rongxing Lu; Zhenfu Cao; Xiaolei Dong

2008-04-01T23:59:59.000Z

150

A conservative scheme for the relativistic Vlasov-Maxwell system  

Science Conference Proceedings (OSTI)

A new scheme for numerical integration of the 1D2V relativistic Vlasov-Maxwell system is proposed. Assuming that all particles in a cell of the phase space move with the same velocity as that of the particle located at the center of the cell at the beginning ... Keywords: Laser-plasma interaction, Plasma instability, Relativistic Vlasov-Maxwell system

Akihiro Suzuki; Toshikazu Shigeyama

2010-03-01T23:59:59.000Z

151

Image Fusion schemes using ICA bases Nikolaos Mitianoudis, Tania Stathaki  

E-Print Network (OSTI)

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

Mitianoudis, Nikolaos

152

libscheme: Scheme as a C Library Brent W. Benson Jr.  

E-Print Network (OSTI)

. That language is Tcl [5]. It is the author's opinion that the popularity of Tcl is primarily due to the ease. The libscheme library attempts to learn from Tcl's success by making Scheme [3] available as a C library is not as convenient as Tcl in the role of an interactive shell program, it has several advantages over Tcl

153

A Real-Time Four-Dimensional Doppler Dealiasing Scheme  

Science Conference Proceedings (OSTI)

A new dealiasing scheme uses the full four-dimensionality available in an operational Doppler radar data stream. It examines one tilt angle at a time, beginning at the highest elevation where clutter is minimal and gate-to-gate shear is typically ...

Curtis N. James; Robert A. Houze Jr.

2001-10-01T23:59:59.000Z

154

Cryptanalysis of the RCES/RSES image encryption scheme  

Science Conference Proceedings (OSTI)

Recently, a chaos-based image encryption scheme called RCES (also called RSES) was proposed. This paper analyses the security of RCES, and points out that it is insecure against the known/chosen-plaintext attacks: the number of required known/chosen ... Keywords: CKBA, Chaotic cryptography, Chosen-plaintext attack, Cryptanalysis, Image encryption, Known-plaintext attack, RCES/RSES

Shujun Li; Chengqing Li; Guanrong Chen; Kwok-Tung Lo

2008-07-01T23:59:59.000Z

155

A Novel Scheme for Parameterizing Aerosol Processing in Warm Clouds  

Science Conference Proceedings (OSTI)

A novel 2-moment bulk aerosol parameterization is derived from a state-of-the-art 2D bin microphysics model using power law relationships and a semi-analytical technique for activation. The activation scheme predicts both number and mass of a ...

Zachary J. Lebo; Hugh Morrison

156

Cohomological invariants of coherent sheaves over projective schemes - a survey  

E-Print Network (OSTI)

Abstract. We give a survey on certain results related to the cohomology of projective schemes with coefficients in coherent sheaves. In particular we present results on cohomological patterns, cohomological Hilbert functions and cohomological Hilbert polynomials. Bounding results for Castelnuovo-Mumford regularities, Severi coregularities and cohomological postulation numbers are discussed. Moreover, a number of open questions is presented.

M. Brodmann; Cohomological Hilbert Functions

2001-01-01T23:59:59.000Z

157

The Age of Impatience: Optimal Replication Schemes for Opportunistic Networks  

E-Print Network (OSTI)

The Age of Impatience: Optimal Replication Schemes for Opportunistic Networks Joshua Reich infrastructure is often ei- ther inadequate or overly expensive to fill the demand. Here, we study an alternative in the form of any monotonically decreasing delay-utility functions, we show that an optimal allocation can

158

A new blowdown compensation scheme for boiler leak detection  

E-Print Network (OSTI)

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

Marquez, Horacio J.

159

Numerical Simulation of Boundary Layer Variables Using ??? Closure Scheme  

Science Conference Proceedings (OSTI)

In this study, a one-and-a-half-order ??? closure scheme is used to study the planetary boundary layer development over a full diurnal cycle using Wangara 33d-day observations as initial conditions. The simulated results are compared with a first-...

N. Ramanathan; K. Srinivasan; B. V. Seshasayee

1995-02-01T23:59:59.000Z

160

ID-based proxy signature scheme with message recovery  

Science Conference Proceedings (OSTI)

A proxy signature scheme, introduced by Mambo, Usuda and Okamoto, allows an entity to delegate its signing rights to another entity. Identity based public key cryptosystems are a good alternative for a certificate based public key setting, especially ... Keywords: Bilinear pairing, ID-based signature, Mobile agent, Proxy signature, Signature with message recovery

Harendra Singh; Girraj Kumar Verma

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Optimal (k, n) visual cryptographic schemes for general k  

Science Conference Proceedings (OSTI)

In (k, n) visual cryptographic schemes (VCS), a secret image is encrypted into n pages of cipher text, each printed on a transparency sheet, which are distributed among n participants. The image can be visually decoded ... Keywords: 05B05, 94A60, Block design, Kronecker algebra, L1-norm, Pixel expansion, Progressive optimality, Relative contrast, Unbalanced VCS

Mausumi Bose; Rahul Mukerjee

2010-04-01T23:59:59.000Z

162

Untraceable blind signature schemes based on discrete logarithm problem  

Science Conference Proceedings (OSTI)

With the help of a blind signature scheme, a requester can obtain a signature on a message from a signer such that the signer knows nothing about the content of the messages and is unable to link the resulting message-signature pair; namely, a blind ... Keywords: DSA, RSA, blind signature, cryptography

Cheng-Chi Lee; Wei-Pang Yang; Min-Shiang Hwang

2002-09-01T23:59:59.000Z

163

CATA: a garbage collection scheme for flash memory file systems  

Science Conference Proceedings (OSTI)

The problem of flash memory is that it cannot be overwritten unless erased in advance. In order to avoid having to erase during every update, non-in-place-update schemes have been widely used. In case of non-in-place update mechanism, garbage collection ...

Longzhe Han; Yeonseung Ryu; Keunsoo Yim

2006-09-01T23:59:59.000Z

164

Cabauw Data for the Validation of Land Surface Parameterization Schemes  

Science Conference Proceedings (OSTI)

This paper describes and interprets the 1987 data from Cabauw, the Netherlands, which can be used to test land surface schemes in stand-alone mode. The data are available from the authors for model development and research. It consists of half-...

Anton C. M. Beljaars; Fred C. Bosveld

1997-06-01T23:59:59.000Z

165

Security problems with a chaos-based deniable authentication scheme  

E-Print Network (OSTI)

Recently, a new scheme was proposed for deniable authentication. Its main originality lied on applying a chaos-based encryption-hash parallel algorithm and the semi-group property of the Chebyshev chaotic map. Although original and practicable, its insecurity and inefficiency are shown in this paper, thus rendering it inadequate for adoption in e-commerce.

G. Alvarez

2004-12-09T23:59:59.000Z

166

SIMULATION STUDY OF THREE-DIMENSIONAL LASER COOLING SCHEMES FOR FAST STORED BEAMS  

SciTech Connect

Molecular dynamics (MD) approach is employed to study laser cooling of fast circulating beams in a storage ring. The authors compare several three-dimensional (3D) cooling methods, examining achievable minimum beam temperature. In particular, the stress is put upon the three coupling schemes, i.e. the dispersion-coupling scheme, the coupling-cavity scheme, and the tapered cooling scheme. The authors show that beam temperatures much lower than the currently achievable level could be reached with these schemes.

KIHARA,T.; OKAMOTO,H.; IWASHITA,Y.; OIDE,K.; LAMANNA,G.; WEI,J.

1998-06-22T23:59:59.000Z

167

On the practice of artificial intelligence based predictive control scheme: a case study  

Science Conference Proceedings (OSTI)

This paper describes a novel artificial intelligence based predictive control scheme for the purpose of dealing with so many complicated systems. In the control scheme proposed here, the system has to be first represented through a multi-Takagi-Sugeno-Kang ... Keywords: Drum-type boiler-turbine system, GPC identifier, GPC scheme, Industrial tubular heat exchanger system, Linear model approximation, Multi-GPC scheme, Multi-TSK fuzzy-based model approach, NLGPC scheme, System operating points

A. H. Mazinan; M. Sheikhan

2012-01-01T23:59:59.000Z

168

A C 2 four-point subdivision scheme with fourth order accuracy and its extensions  

E-Print Network (OSTI)

Abstract. We present a new four-point subdivision scheme that generates C 2 curves. It reproduces cubic polynomials, has a basic limit function with support [?4, 3], and is close to being interpolatory. The refinement rule is based on local cubic interpolation, followed by evaluation at 1/4 and 3/4 of the refined interval. We investigate the approximation properties of this four-point scheme and extend it to a new family of 2n-point schemes. The performance of the new schemes is demonstrated by several examples. Subdivision schemes are efficient methods for generating curves and surfaces from discrete sets of control points. The important schemes for applications are schemes for surfaces, yet schemes generating curves constitute a basic tool for the design, study, and understanding of schemes

Nira Dyn; Michael S. Floater; Kai Hormann

2005-01-01T23:59:59.000Z

169

Full Rate Collaborative Diversity Scheme for Multiple Access Fading Channels  

E-Print Network (OSTI)

User cooperation is a well-known approach to achieve diversity without multiple antennas, however at the cost of inevitable loss of rate mostly due to the need of additional channels for relaying. A new collaborative diversity scheme is proposed here for multiple access fading channels to attain full rate with near maximum diversity. This is achieved by allowing two users and their corresponding relays to transmit/forward data on the same channel by exploiting unique spatial-signatures of their fading channels. The base-station jointly detects the co-channel users' data using maximum-likelihood search algorithm over small set of possible data combinations. Full data rate with significant diversity gain near to two-antenna Alamouti scheme is shown.

Shakya, Indu; Stipidis, Elias

2011-01-01T23:59:59.000Z

170

COMPARING THE EFFECT OF RADIATIVE TRANSFER SCHEMES ON CONVECTION SIMULATIONS  

Science Conference Proceedings (OSTI)

We examine the effect of different radiative transfer schemes on the properties of three-dimensional (3D) simulations of near-surface stellar convection in the superadiabatic layer, where energy transport transitions from fully convective to fully radiative. We employ two radiative transfer schemes that fundamentally differ in the way they cover the 3D domain. The first solver approximates domain coverage with moments, while the second solver samples the 3D domain with ray integrations. By comparing simulations that differ only in their respective radiative transfer methods, we are able to isolate the effect that radiative efficiency has on the structure of the superadiabatic layer. We find the simulations to be in good general agreement, but they show distinct differences in the thermal structure in the superadiabatic layer and atmosphere.

Tanner, Joel D.; Basu, Sarbani; Demarque, Pierre [Astronomy Department, Yale University, P.O. Box 208101, New Haven, CT 06520-8101 (United States)

2012-11-10T23:59:59.000Z

171

An Auditable Metering Scheme for Web Advertisement Applications  

E-Print Network (OSTI)

This paper proposes a cryptographic mechanism for metering the duration and/or the number of instances of running a data process. This mechanism has the following property: knowing a secret, one can validate a piece of metering evidence in constant units of time while without the secret the job of generating a valid piece of evidence requires time indicated by a value in the evidence. Because the mechanism utilises a well-known computational complexity problem, the meter based on it can be implemented in software yet is tamper-resistant. We will address the use of this mechanism in building an auditable metering scheme for finding the popularity of web sites. The scheme is suitable for rapidly increasing web advertisement applications. We will also discuss the related security issues and mention some other applications, which can benefit by using the mechanism. Keywords: Auditable metering, Web advertisement, Tamper-resistant software, Lightweight security. 1

Liqun Chen; Wenbo Mao

2000-01-01T23:59:59.000Z

172

Vorticity Preserving Flux Corrected Transport Scheme for the Acoustic Equations  

SciTech Connect

Long term research goals are to develop an improved cell-centered Lagrangian Hydro algorithm with the following qualities: 1. Utilizes Flux Corrected Transport (FCT) to achieve second order accuracy with multidimensional physics; 2. Does not rely on the one-dimensional Riemann problem; and 3. Implements a form of vorticity control. Short term research goals are to devise and implement a 2D vorticity preserving FCT solver for the acoustic equations on an Eulerian mesh: 1. Develop a flux limiting mechanism for systems of governing equations with symmetric wave speeds; 2. Verify the vorticity preserving properties of the scheme; and 3. Compare the performance of the scheme to traditional MUSCL-Hancock and other algorithms.

Lung, Tyler B. [Los Alamos National Laboratory; Roe, Phil [University of Michigan; Morgan, Nathaniel R. [Los Alamos National Laboratory

2012-08-15T23:59:59.000Z

173

An iterative semi-implicit scheme with robust damping  

Science Conference Proceedings (OSTI)

An efficient, iterative semi-implicit (SI) numerical method for the time integration of stiff wave systems is presented. Physics-based assumptions are used to derive a convergent iterative formulation of the SI scheme which enables the monitoring and ... Keywords: 52.30Ex, 52.35Hr, 52.35Py, 52.35Vd, 52.65Tt, Dispersive plasma waves, Gyrofluid, Magnetic reconnection, Robust damping, Semi-implicit methods, Symplectic methods

N. F. Loureiro; G. W. Hammett

2008-04-01T23:59:59.000Z

174

Finite volume schemes for dispersive wave propagation and runup  

E-Print Network (OSTI)

Finite volume schemes are commonly used to construct approximate solutions to conservation laws. In this study we extend the framework of the finite volume methods to dispersive water wave models, in particular to Boussinesq type systems. We focus mainly on the application of the method to bidirectional nonlinear, dispersive wave propagation in one space dimension. Special emphasis is given to important nonlinear phenomena such as solitary waves interactions, dispersive shock wave formation and the runup of breaking and non-breaking long waves.

Dutykh, Denys; Mitsotakis, Dimitrios

2010-01-01T23:59:59.000Z

175

Secret Sharing Scheme: Vector Space Secret Sharing and F Function  

Science Conference Proceedings (OSTI)

Let ${\\cal P}=\\{P_{1}, P_{2}, ..., P_{n}\\}$ be set of participants and $\\Gamma=\\{B_{i}| B_{i}\\subset {\\cal P}, 1\\leq i \\leq k \\}$ be access structure. Vector space secret sharing realizing access structure $\\Gamma$ requires existence of function $\\phi ... Keywords: Cryptography,Bismuth,Vectors,Computer science,Ignition,Nuclear weapons,Indium tin oxide,vector space sharing,Cryptography,secret sharing scheme,access structure

Mustafa Atici

2012-08-01T23:59:59.000Z

176

Formal verification of hierarchically distributed agent based protection scheme in smart grid  

Science Conference Proceedings (OSTI)

In recent studies, hierarchically distributed non-intrusive agent aided transmission line distance relaying protection scheme has been proposed. This scheme is meant to provide the distance relays with situational awareness and improve their robustness ...

Shravan Garlapati; Sandeep K. Shukla

2012-07-01T23:59:59.000Z

177

A Transfer Function Analysis of Numerical Schemes Used to Simulate Geostrophic Adjustment  

Science Conference Proceedings (OSTI)

Traditional analysis of finite-difference and finite-element schemes used in numerical weather prediction has concentrated almost exclusively on an analysis of the accuracy with which the scheme simulates the phase speeds involved. In this paper ...

Arthur L. Schoenstadt

1980-08-01T23:59:59.000Z

178

Trajectory-Tracking Scheme in Lagrangian Form for Solving Linear Advection Problems: Preliminary Tests  

Science Conference Proceedings (OSTI)

A Lagrangian linear advection scheme, which is called the trajectory-tracking scheme, is proposed in this paper. The continuous tracer field has been discretized as finite tracer parcels that are points moving with the velocity field. By using the ...

Li Dong; Bin Wang

2012-02-01T23:59:59.000Z

179

A Real-Time Scheme for the Prediction of Forecast Skill  

Science Conference Proceedings (OSTI)

During the winter of 1988/89, a real-time experimental scheme to predict skill of the ECMWF operational forecast was devised. The scheme was based on statistical relations between skill scores (the predictands) and a number of predictors ...

Franco Molteni; T. N. Palmer

1991-04-01T23:59:59.000Z

180

Implementation and Validation of a Condensation Scheme in a Nonhydrostatic Mesoscale Model  

Science Conference Proceedings (OSTI)

In this paper a condensation scheme is implemented in a nonhydrostatic mesoscale model (MEMO). An overview of the model and the modified Sundqvist condensation scheme are given. The model, including condensation (MEMOIC), is tested on two well-...

Anne Dagrun Sandvik

1998-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

A Pointwise Energy Diagnostic Scheme for Multilayer, Nonisopycnic, Primitive Equation Ocean Models  

Science Conference Proceedings (OSTI)

Considered is a pointwise energy diagnostic scheme for a multilayer, primitive equation, nonisopycnic ocean model. Both conservative as well as nonconservative energy exchange terms are considered. Moreover, the scheme is worked out for both the ...

Lars Petter Red

1999-08-01T23:59:59.000Z

182

Interference cancellation schemes for single-carrier block transmission with insufficient cyclic prefix  

Science Conference Proceedings (OSTI)

This paper proposes intersymbol interference (ISI) and interblock interference (IBI) cancellation schemes at the transmitter and the receiver for the single-carrier block transmission with insufficient cyclic prefix (CP). The proposed scheme at the transmitter ...

Kazunori Hayashi; Hideaki Sakai

2008-01-01T23:59:59.000Z

183

Reducing signaling traffic in wireless ATM networks through handoff scheme improvement  

Science Conference Proceedings (OSTI)

We propose a new handoff call management scheme which reduces signaling traffic in wireless ATM networks and improves the efficiency of the virtual channel. Chaining followed by a make-break algorithm is a suitable handoff scheme for various situations. ...

Anna Ha?; Yongcan Zhang

2002-08-01T23:59:59.000Z

184

The Extension of P.D. Thompson' Scheme to Multiple Times  

Science Conference Proceedings (OSTI)

P.D. Thompson devised a scheme to correct imperfect analyses of a conservative quantity at two observation times. His scheme has been extended to include a sequence of observation times. When the times are equally spaced, the governing adjustment ...

John M. Lewis; Lee Panetta

1983-09-01T23:59:59.000Z

185

A New Scheme for Improving the Seasonal Prediction of Summer Precipitation Anomalies  

Science Conference Proceedings (OSTI)

A new scheme is developed to improve the seasonal prediction of summer precipitation in the East Asian and western Pacific region. The scheme is applied to the Development of a European Multimodel Ensemble System for Seasonal to Interannual ...

Huijun Wang; Ke Fan

2009-04-01T23:59:59.000Z

186

An Improved Snow Scheme for the ECMWF Land Surface Model: Description and Offline Validation  

Science Conference Proceedings (OSTI)

A new snow scheme for the European Centre for Medium-Range Weather Forecasts (ECMWF) land surface model has been tested and validated. The scheme includes a new parameterization of snow density, incorporating a liquid water reservoir, and revised ...

Emanuel Dutra; Gianpaolo Balsamo; Pedro Viterbo; Pedro M. A. Miranda; Anton Beljaars; Christoph Schr; Kelly Elder

2010-08-01T23:59:59.000Z

187

A Simple Scheme for Daytime Estimates of the Surface Fluxes from Routine Weather Data  

Science Conference Proceedings (OSTI)

In this paper a simple empirical scheme is presented, which gives hourly estimates of the surface fluxes of heat and momentum from routine weather data during daytime. The scheme is designed for grass surfaces, but it contains parameters which ...

A. A. M. Holtslag; A. P. Van Ulden

1983-04-01T23:59:59.000Z

188

A Comprehensive Radiation Scheme for Numerical Weather Prediction Models with Potential Applications in Climate Simulations  

Science Conference Proceedings (OSTI)

A comprehensive scheme for the parameterization of radiative transfer in numerical weather Prediction (NWP) models has been developed. The scheme is based on the solution of the ?-two-stream version of the radiative transfer equation ...

Bodo Ritter; Jean-Francois Geleyn

1992-02-01T23:59:59.000Z

189

A Comparison of Breeding and Ensemble Transform Kalman Filter Ensemble Forecast Schemes  

Science Conference Proceedings (OSTI)

The ensemble transform Kalman filter (ETKF) ensemble forecast scheme is introduced and compared with both a simple and a masked breeding scheme. Instead of directly multiplying each forecast perturbation with a constant or regional rescaling ...

Xuguang Wang; Craig H. Bishop

2003-05-01T23:59:59.000Z

190

Explicit Representation of Subgrid Heterogeneity in a GCM Land Surface Scheme  

Science Conference Proceedings (OSTI)

A land surface scheme that may be run with or without a tiled representation of subgrid heterogeneity and includes an implicit atmospheric coupling scheme is described. Simulated average surface air temperatures and diurnal temperature ranges in ...

R. L. H. Essery; M. J. Best; R. A. Betts; P. M. Cox; C. M. Taylor

2003-06-01T23:59:59.000Z

191

The Representation of Snow in Land Surface Schemes: Results from PILPS 2(d)  

Science Conference Proceedings (OSTI)

Twenty-one land surface schemes (LSSs) performed simulations forced by 18 yr of observed meteorological data from a grassland catchment at Valdai, Russia, as part of the Project for the Intercomparison of Land-Surface Parameterization Schemes (...

A. G. Slater; C. A. Schlosser; C. E. Desborough; A. J. Pitman; A. Henderson-Sellers; A. Robock; K. Ya Vinnikov; J. Entin; K. Mitchell; F. Chen; A. Boone; P. Etchevers; F. Habets; J. Noilhan; H. Braden; P. M. Cox; P. de Rosnay; R. E. Dickinson; Z-L. Yang; Y-J. Dai; Q. Zeng; Q. Duan; V. Koren; S. Schaake; N. Gedney; Ye M. Gusev; O. N. Nasonova; J. Kim; E. A. Kowalczyk; A. B. Shmakin; T. G. Smirnova; D. Verseghy; P. Wetzel; Y. Xue

2001-02-01T23:59:59.000Z

192

Some Economical, Explicit Finite-Difference Schemes for the Primitive Equations  

Science Conference Proceedings (OSTI)

The methods discussed in this paper are based on time-staggered schemes which are made unstaggered by means of an interpolation procedure. The advantages of time-staggered schemes are discussed, and it is shown by theoretical arguments and ...

Arne M. Bratseth

1983-04-01T23:59:59.000Z

193

Applications of the Barnes Objective Analysis Scheme. Part II: Improving Derivative Estimates  

Science Conference Proceedings (OSTI)

Two recently published objective analysis schemes improve derivative estimates obtained from observed field variables. Achtemeier proposed a hybrid successive-correction scheme that uses a very low pass Gaussian weight function on the first pass ...

Stanley L. Barnes

1994-12-01T23:59:59.000Z

194

An Interactive Barnes Objective Map Analysis Scheme for Use with Satellite and Conventional Data  

Science Conference Proceedings (OSTI)

An objective analysis scheme based on the Barnes technique and designed for use on an interactive computer is described. In order to meet the specific needs of the research meteorologist, the interactive Barnes scheme allows real-time assessments ...

Steven E. Koch; Mary desJardins; Paul J. Kocin

1983-09-01T23:59:59.000Z

195

Multistage Schemes With Multigrid for Euler and Navier-Stokes Equations  

Science Conference Proceedings (OSTI)

A class of explicit multistage time-stepping schemes with centered spatial differencing and multigrid are considered for the compressible Euler and Navier-Stokes equations. These schemes are the basis for a family of computer programs (flow codes with ...

Swanson R. C.; Turkel Eli

1997-08-01T23:59:59.000Z

196

Impact of a Nonlocal Closure Scheme in a Simulation of a Monsoon System over India  

Science Conference Proceedings (OSTI)

The impact of two parameterization schemes for the atmospheric boundary layer in predicting monsoon circulation over the Indian region has been studied using a Global Spectral Model. The performance of the nonlocal closure scheme for the boundary ...

Swati Basu; G. R. Iyengar; A. K. Mitra

2002-01-01T23:59:59.000Z

197

Evaluation of a Turbulence Closure Scheme Suitable for Air-Pollution Applications  

Science Conference Proceedings (OSTI)

A computationally turbulence closure scheme is formulated and evaluated. The scheme includes a correction to the redistribution terms in order to account for the influence of the underlying surface. Care is taken in order to ensure realizability ...

Anders Andrn

1990-03-01T23:59:59.000Z

198

The Forwardin-Time Upstream Advection Scheme: Extension to Higher Orders  

Science Conference Proceedings (OSTI)

A generalized forward-in-time upstream advective operator following the methodology of Crowley is developed and advective schemes of orders 1 through 10 are tested analytically and numerically. Flux forms of these schemes are also derived with ...

Craig J. Tremback; James Powell; William R. Cotton; Roger A. Pielke

1987-02-01T23:59:59.000Z

199

A Double-Moment Multiple-Phase Four-Class Bulk Ice Scheme. Part I: Description  

Science Conference Proceedings (OSTI)

A detailed ice-phase bulk microphysical scheme has been developed for simulating the hydrometeor distributions of convective and stratiform precipitation in different large-scale environmental conditions. The proposed scheme involves 90 distinct ...

Brad Schoenberg Ferrier

1994-01-01T23:59:59.000Z

200

Trajectory-Tracking Scheme in Lagrangian Form for Solving Linear Advection Problems: Interface Spatial Discretization  

Science Conference Proceedings (OSTI)

A previous Lagrangian linear advection scheme (trajectory-tracking scheme) is modified to achieve local mass conservation in this paper, which is more favorable to climate modeling. The discretized tracer parcels are volumes with interfaces ...

Li Dong; Bin Wang

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

Nonlinear Advection Schemes and Energy Cascade on Semi-Staggered Grids  

Science Conference Proceedings (OSTI)

A common problem with nonlinear advection schemes is the false accumulation of energy at the smallest resolvable scales. To keep this process under control, following Arakawa (1966), a number of energy and enstrophy conserving schemes for ...

Zavisa I. Janji?

1984-06-01T23:59:59.000Z

202

Implementation of the Cloud Prediction Scheme in the Eta Model at NCEP  

Science Conference Proceedings (OSTI)

An explicit cloud prediction scheme has been developed and incorporated into the Eta Model at the National Centers for Environmental Prediction (NCEP) to improve the cloud and precipitation forecasts. In this scheme, the cloud liquid water and ...

Qingyun Zhao; Thomas L. Black; Michael E. Baldwin

1997-09-01T23:59:59.000Z

203

A New Bulk Microphysical Scheme That Includes Riming Intensity and Temperature-Dependent Ice Characteristics  

Science Conference Proceedings (OSTI)

A new bulk microphysical parameterization (BMP) scheme is presented that includes a diagnosed riming intensity and its impact on ice characteristics. As a result, the new scheme represents a continuous spectrum from pristine ice particles to ...

Yanluan Lin; Brian A. Colle

2011-03-01T23:59:59.000Z

204

The Project for Intercomparison of Land Surface Parameterization Schemes (PILPS): Phases 2 and 3  

Science Conference Proceedings (OSTI)

The World Climate Research Programme Project for Intercomparison of Land Surface Parameterization Schemes (PILPS) is moving into its second and third phases that will exploit observational data and consider the performance of land surface schemes ...

A. Henderson-Sellers; A. J. Pitman; P. K. Love; P. Irannejad; T. H. Chen

1995-04-01T23:59:59.000Z

205

Cloud Modeling Tests of the ULTIMATEMACHO Scalar Advection Scheme  

Science Conference Proceedings (OSTI)

Numerical diffusion can be minimized using fine grid spacing and/or higher-order numerical schemes. In this study, the authors focus on higher-order scalar advection schemes and their effects on simulated cloud fields. A monotonic multidimensional ...

Takanobu Yamaguchi; David A. Randall; Marat F. Khairoutdinov

2011-10-01T23:59:59.000Z

206

Generalized Energy and Potential Enstrophy Conserving Finite Difference Schemes for the Shallow Water Equations  

Science Conference Proceedings (OSTI)

The conditions under which finite difference schemes for the shallow water equations can conserve both total energy and potential enstrophy are considered. A method of deriving such schemes using operator formalism is developed. Several such ...

Frank Abramopoulos

1988-03-01T23:59:59.000Z

207

A Mass-Conserving Semi-Lagrangian Scheme for the Shallow-Water Equations  

Science Conference Proceedings (OSTI)

By generalizing the algorithm of Priestley for passively advected fields, a mass-conserving scheme for the coupled shallow-water equations is obtained. It is argued that the interpolation step of semi-Lagrangian schemes is the principal reason ...

Sylvie Gravel; Andrew Staniforth

1994-01-01T23:59:59.000Z

208

A Potential Enstrophy and Energy Conserving Scheme for the Shallow Water Equations  

Science Conference Proceedings (OSTI)

To improve the simulation of nonlinear aspects of the flow over steep topography, a potential enstrophy and energy conserving scheme for the shallow water equations is derived. It is pointed out that a family of schemes can conserve total energy ...

Akio Arakawa; Vivian R. Lamb

1981-01-01T23:59:59.000Z

209

A Mass Flux Convection Scheme with Representation of Cloud Ensemble Characteristics and Stability-Dependent Closure  

Science Conference Proceedings (OSTI)

The convection scheme used at the UK Meteorological Office in large-scale numerical models is described. The scheme uses a bulk cloud model to represent an ensemble of convective clouds and aims to represent shallow, deep and midlevel ...

D. Gregory; P. R. Rowntree

1990-07-01T23:59:59.000Z

210

An AirSoil Layer Coupled Scheme for Computing Surface Heat Fluxes  

Science Conference Proceedings (OSTI)

An airsoil layer coupled scheme is developed to compute surface fluxes of sensible heat and latent heat from data collected at the Oklahoma Atmospheric Radiation MeasurementCloud and Radiation Testbed (ARMCART) stations. This new scheme ...

Qin Xu; Binbin Zhou; Stephen D. Burk; Edward H. Barker

1999-02-01T23:59:59.000Z

211

PROPOSAL OF A FINANCING SCHEME FOR A THIRD NPP IN BRAZIL  

Science Conference Proceedings (OSTI)

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

Filho, Z.D.T.

2004-10-06T23:59:59.000Z

212

A Fully Two-Dimensional, Nonoscillatory Advection Scheme for Momentum and Scalar Transport Equations  

Science Conference Proceedings (OSTI)

The advection scheme developed in this study is a fully two-dimensional and nonoscillatory extension of the one-dimensional Crowley-type mass-conserving schemes. The fully two-dimensional scheme includes new cell-to-cell fluxes directed along the ...

Elas Valur Hlm

1995-02-01T23:59:59.000Z

213

An Integrated Turbulence Scheme for Boundary Layers with Shallow Cumulus Applied to Pollutant Transport  

Science Conference Proceedings (OSTI)

A scheme is described that provides an integrated description of turbulent transport in free convective boundary layers with shallow cumulus. The scheme uses a mass-flux formulation, as is commonly found in cumulus schemes, and a 1.5-order ...

Wayne M. Angevine

2005-09-01T23:59:59.000Z

214

Short-term load forecasting using lifting scheme and ARIMA models  

Science Conference Proceedings (OSTI)

Short-term load forecasting is achieved using a lifting scheme and autoregressive integrated moving average (ARIMA) models. The lifting scheme is a general and flexible approach for constructing bi-orthogonal wavelets that are usually in the spatial ... Keywords: Autoregressive integrated moving average model, Back propagation network, Lifting scheme, Multi-revolution analysis, Short-term load forecasting, Wavelet transform

Cheng-Ming Lee; Chia-Nan Ko

2011-05-01T23:59:59.000Z

215

A New Second-Order Turbulence Closure Scheme for Modeling the Oceanic Mixed Layer  

Science Conference Proceedings (OSTI)

A new second-order turbulence closure scheme is proposed for the oceanic mixed layer. The scheme is similar in complexity to a MellorYamada level 2.5 scheme in that the turbulent kinetic energy is the only turbulence quantity treated ...

S. J. D. DAlessio; K. Abdella; N. A. McFarlane

1998-08-01T23:59:59.000Z

216

Fourth-order alternating direction implicit compact finite difference schemes for two-dimensional Schrdinger equations  

Science Conference Proceedings (OSTI)

In this paper, alternating direction implicit compact finite difference schemes are devised for the numerical solution of two-dimensional Schrodinger equations. The convergence rates of the present schemes are of order O(h^4+@t^2). Numerical experiments ... Keywords: ADI compact difference scheme, Conservation law, Error estimate, Schrdinger equation

Zhen Gao; Shusen Xie

2011-04-01T23:59:59.000Z

217

A Comparative Study of Numerical Advection Schemes Featuring a One-Step Modified WKL Algorithm  

Science Conference Proceedings (OSTI)

A fourth-order Crowley-type advection scheme based on the multistep Warming-Kutler-Lomax (WKL) scheme is proposed in this study. This scheme utilizes a free parameter to minimize dispersion and dissipation and can be used to represent the ...

Ching-Yuang Huang; Sethu Raman

1991-12-01T23:59:59.000Z

218

A Stability Analysis of Finite-Volume Advection Schemes Permitting Long Time Steps  

Science Conference Proceedings (OSTI)

Finite-volume schemes developed in the meteorological community that permit long time steps are considered. These include Eulerian flux-form schemes as well as fully two-dimensional and cascade cell-integrated semi-Lagrangian (CISL) schemes. A ...

Peter Hjort Lauritzen

2007-07-01T23:59:59.000Z

219

Numerical Study of Compressible Mixing Layers Using High-Order WENO Schemes  

Science Conference Proceedings (OSTI)

This paper reports high resolution simulations using fifth-order weighted essentially non-oscillatory (WENO) schemes with a third-order TVD Runge-Kutta method to examine the features of turbulent mixing layers. The implementation of high-order WENO schemes ... Keywords: DNS, Mixing layer, Shock-waves, WENO schemes

Arnab Chaudhuri; Abdellah Hadjadj; Ashwin Chinnayya; Sandrine Palerm

2011-05-01T23:59:59.000Z

220

Test of a Staggered PRT Scheme for the French Radar Network  

Science Conference Proceedings (OSTI)

This paper describes the test of a staggered PRT scheme for the French radar network. The design of the staggered scheme has been done in the following context: 1) the scheme is meant to be implemented on existing C-band and S-band radars of the ...

P. Tabary; L. Perier; J. Gagneux; J. Parent-du-Chatelet

2005-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Extension of a Conservative Cascade Scheme on the Sphere to Large Courant Numbers  

Science Conference Proceedings (OSTI)

The conservative cascade scheme (CCS) combines a one-dimensional mass-conserving finite-volume method with an efficient semi-Lagrangian scheme over the sphere. Major limitations of this scheme are a breakdown in the polar region due to the ...

Ramachandran D. Nair

2004-01-01T23:59:59.000Z

222

Harmonic measurements from a group connected generator HVdc converter scheme  

SciTech Connect

A recent CIGRE document published in ELECTRA has described the potential benefits of a direct connection of generators to HVdc converters. While many theoretical contributions have been made, no practical test data has become available so far. This paper reports on harmonic tests carried out at the Benmore end of the New Zealand HVdc link operating as a group connected scheme. It was found that the measured harmonic current levels were well below specified generator ratings. Dynamic simulation accurately predicted the harmonic currents whereas the results of a steady state formulation were less reliable.

Macdonald, S.J.; Enright, W.; Arrillaga, J. [Univ. of Canterbury, Christchurch (New Zealand); O`Brien, M.T.

1995-10-01T23:59:59.000Z

223

A Class of Conservative Fourth-Order Advection Schemes and Impact of Enhanced Formal Accuracy on Extended-Range Forecasts  

Science Conference Proceedings (OSTI)

Starting from three Eulerian second-order nonlinear advection schemes for semi-staggered Arakawa grids B/E, advection schemes of fourth order of formal accuracy were developed. All three second-order advection schemes control the nonlinear energy ...

Zavisa Janjic; Tijana Janjic; Ratko Vasic

2011-05-01T23:59:59.000Z

224

New Pellet Injection Schemes on DIII-D  

SciTech Connect

The pellet fueling system on DIII-D has been modified for injection of deuterium pellets from two vertical ports and two inner wall locations on the magnetic high-field side (HFS) of the tokamak. The HFS pellet injection technique was first employed on ASDEX-Upgrade with significant improvements reported in both pellet penetration and fueling efficiency. The new pellet injection schemes on DIII-D required the installation of new guide tubes. These lines are {approx_equal}12.5 m in total length and are made up of complex bends and turns (''roller coaster'' like) to route pellets from the injector to the plasma, including sections inside the torus. The pellet speed at which intact pellets can survive through the curved guide tubes is limited ({approx_equal}200-300 m/s for HFS injection schemes). Thus, one of the three gas guns on the injector was modified to provide pellets in a lower speed regime than the original guns (normal speed range {approx_equal}500 to 1000 m/s). The guide tube installations and gun modifications are described along with the injector operating parameters, and the latest test results are highlighted.

Anderson, P.M.; Baylor, L.R.; Combs, S.K.; Foust, C.R.; Jernigan, T.C.; Robinson, J.I.

1999-11-13T23:59:59.000Z

225

Maximum power tracking control scheme for wind generator systems  

E-Print Network (OSTI)

The purpose of this work is to develop a maximum power tracking control strategy for variable speed wind turbine systems. Modern wind turbine control systems are slow, and they depend on the design parameters of the turbine and use wind and/or rotor speed measurements as control variable inputs. The dependence on the accuracy of the measurement devices makes the controller less reliable. The proposed control scheme is based on the stiff system concept and provides a fast response and a dynamic solution to the complicated aerodynamic system. This control scheme provides a response to the wind changes without the knowledge of wind speed and turbine parameters. The system consists of a permanent magnet synchronous machine (PMSM), a passive rectifier, a dc/dc boost converter, a current controlled voltage source inverter, and a microcontroller that commands the dc/dc converter to control the generator for maximum power extraction. The microcontroller will also be able to control the current output of the three-phase inverter. In this work, the aerodynamic characteristics of wind turbines and the power conversion system topology are explained. The maximum power tracking control algorithm with a variable step estimator is introduced and the modeling and simulation of the wind turbine generator system using the MATLAB/SIMULINK software is presented and its results show, at least in principle, that the maximum power tracking algorithm developed is suitable for wind turbine generation systems.

Mena Lopez, Hugo Eduardo

2007-12-01T23:59:59.000Z

226

Improving the scheme for final comminution of the coal charge  

Science Conference Proceedings (OSTI)

Proceeding from laboratory and pilot plant tests of the screening of fine classes of coal under the effect of gravitational forces on stationary grates, and also from the experience of the Krivoi Rog and Kommunarsk Coke Works, the coal preparation division of OKhMK (Orsk-Khalilovo Intergrated Iron and Steel Works) adopted an industrial scheme of comminution of the coal before coking, screening out the fine classes ahead of the hammer crushers. In the bottom of the feeder chute a stamped screen was installed (dimensions 2100 x 1600 x 5 mm with apertures of 40 x 100 mm) with the large side perpendicular to the flow of coal. The distance between the apertures on the small side of the screen was 20 mm, on the large side 15 mm; the inclination was 60/sup 0/. The overscreen product enters the crusher, and the underscreen product is injected into the crushed charge without comminution.

Antonov, A.V.; Zagoruiko, S.I.; Vorob'ev, S.E.; Kress, L.A.; Stepura, P.G.

1983-01-01T23:59:59.000Z

227

Efficient Collaborative Application Monitoring Scheme for Mobile Networks  

E-Print Network (OSTI)

New operating systems for mobile devices allow their users to download millions of applications created by various individual programmers, some of which may be malicious or flawed. In order to detect that an application is malicious, monitoring its operation in a real environment for a significant period of time is often required. Mobile devices have limited computation and power resources and thus are limited in their monitoring capabilities. In this paper we propose an efficient collaborative monitoring scheme that harnesses the collective resources of many mobile devices, "vaccinating" them against potentially unsafe applications. We suggest a new local information flooding algorithm called "TTL Probabilistic Propagation" (TPP). The algorithm periodically monitors one or more application and reports its conclusions to a small number of other mobile devices, who then propagate this information onwards. The algorithm is analyzed, and is shown to outperform existing state of the art information propagation al...

Altshuler, Yaniv; Elovici, Yuval

2010-01-01T23:59:59.000Z

228

MRST partons generated in a fixed-flavor scheme.  

E-Print Network (OSTI)

ar X iv :h ep -p h/ 06 03 14 3v 1 2 0 M ar 2 00 6 IPPP/06/13 DCPT/06/26 Cavendish-HEP-2006/07 MRST partons generated in a fixed-flavour scheme A.D. Martina, W.J. Stirlinga and R.S. Thornec,1 a Institute for Particle Physics Phenomenology... of such an inconsistency on a physical quantity is provided by the evolution of FL. At leading order the gluon contribution to FL is FL = ?S C1Lg ? g, (2) 2We thank Eric Laenen for clarifying this point. 1 3-Flavour Gluon -4 -2 0 2 4 6 10 -5 10 -4 10 -3 10 -2 10 -1 1 x g(x...

Martin, A D; Stirling, W James; Thorne, Robert S

229

A Variable-flavor number scheme for NNLO.  

E-Print Network (OSTI)

k ( 2) ? q(g)nfk (2). (4) At NLO, i.e. first order in ?S, the non-trivial contributions are (h+ h)(2) = ?S 4pi P 0qg ? gnf (Q2) ln(2/m2H), gnf+1(2) = ( 1? ?S 6pi ln(2/m2H) ) gnf (2), (5) where h(x, 2) is the heavy quark parton distribution... not influence the VFNS up to NNLO. 2The scheme has previously been outlined in a very brief form in [4]. 3 At O(?S) eq.(9) becomes, for example, for the structure function F2(x,Q2) CFF,12,g (Q 2/m2H) = C V F,0 2,HH(Q 2/m2H)? P 0qg ln(2/m2H) + C V F,1 2,g (Q 2/m...

Thorne, Robert S

230

High-spin level scheme of {sup 194}Pb  

SciTech Connect

High-spin states in {sup 194}Pb have been populated in the {sup 168}Er({sup 30}Si,4n) reaction at 142 MeV. The emitted {gamma} rays were detected by the EUROBALL III multidetector array. The level scheme was considerably extended and many previously observed {gamma}-ray transitions were reordered. Four new magnetic rotational bands were observed. The energies and spins of the bandheads of all previously observed magnetic rotational bands were corrected based on the observation of new transitions. From nine observed bands, only one could not be connected to the lower lying states. Based on comparison systematics with neighboring Pb isotopes and tilted-axis cranking model calculations previously reported, configuration assignments to the observed bands have been made.

Kutsarova, T.; Stefanova, E. A.; Minkova, A.; Lalkovski, S.; Korichi, A.; Lopez-Martens, A.; Hannachi, F.; Huebel, H.; Goergen, A.; Jansen, A.; Schoenwasser, G.; Khoo, T. L.; Herskind, B.; Bergstroem, M.; Bazzacco, D.; Podolyak, Z. [Institute for Nuclear Research and Nuclear Energy, BAS, BG-1784 Sofia (Bulgaria); Faculty of Physics, University of Sofia 'St. Kliment Ohridski', BG-1164 Sofia (Bulgaria); CSNSM Orsay, IN2P3/CNRS, F-91405 (France); HISKP, Helmholtz-Institute fuer Strahlen-und Kernphysik, Nussallee 14-16, D-53115 (Germany); ISKP, Universitaet Bonn, Nussallee 14-16, D-53115 (Germany); Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States); The Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen (Denmark); Dipartimento di Fisica, Universita di Padova and INFN Sezione di Padova, I-35131 Padova (Italy); INFN, Laboratori Nationali di Legnaro (Italy)

2009-01-15T23:59:59.000Z

231

CAISO flicks switch on nodal scheme and lights stay on  

Science Conference Proceedings (OSTI)

In 2000-01, two years after introducing a competitive wholesale power auction in California - with a separate day-ahead zonal market operated by the California Power Exchange and a zonal market for ancillary services and balancing energy operated by the California Independent System Operator (CAISO) - the California market collapsed from exorbitant prices, flagrant gaming, and abuse of market power. Nine years later, CAISO introduced a nodal pricing auction for the wholesale market in April, replacing the zonal scheme, which was among many causes of the original market's demise. With nearly 3,000 nodes on the network, high prices in one region do not affect prices everywhere on the system. After investing some $200 million to upgrade the software, countless delays, and 18 months of market simulation and testing, the new auction was introduced and nothing unusual happened.

NONE

2009-06-15T23:59:59.000Z

232

Impact of Geoengineering Schemes on the Global Hydrological Cycle  

SciTech Connect

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.

Bala, G; Duffy, P; Taylor, K

2007-12-07T23:59:59.000Z

233

Universal programmable quantum circuit schemes to emulate an operator  

Science Conference Proceedings (OSTI)

Unlike fixed designs, programmable circuit designs support an infinite number of operators. The functionality of a programmable circuit can be altered by simply changing the angle values of the rotation gates in the circuit. Here, we present a new quantum circuit design technique resulting in two general programmable circuit schemes. The circuit schemes can be used to simulate any given operator by setting the angle values in the circuit. This provides a fixed circuit design whose angles are determined from the elements of the given matrix-which can be non-unitary-in an efficient way. We also give both the classical and quantum complexity analysis for these circuits and show that the circuits require a few classical computations. For the electronic structure simulation on a quantum computer, one has to perform the following steps: prepare the initial wave function of the system; present the evolution operator U=e{sup -iHt} for a given atomic and molecular Hamiltonian H in terms of quantum gates array and apply the phase estimation algorithm to find the energy eigenvalues. Thus, in the circuit model of quantum computing for quantum chemistry, a crucial step is presenting the evolution operator for the atomic and molecular Hamiltonians in terms of quantum gate arrays. Since the presented circuit designs are independent from the matrix decomposition techniques and the global optimization processes used to find quantum circuits for a given operator, high accuracy simulations can be done for the unitary propagators of molecular Hamiltonians on quantum computers. As an example, we show how to build the circuit design for the hydrogen molecule.

Daskin, Anmer; Grama, Ananth; Kollias, Giorgos [Department of Computer Science, Purdue University, West Lafayette, Indiana 47907 (United States); Kais, Sabre [Department of Chemistry, Department of Physics and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana 47907 (United States); Qatar Environment and Energy Research Institute, Doha (Qatar)

2012-12-21T23:59:59.000Z

234

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

E-Print Network (OSTI)

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 improvement, implementing the two schemes has obtained considerable results; therefore, the two schemes are on the right path towards promoting a sustainable eco-city. However, it has to be admitted that the two schemes are a rather technocratic set of solutions and eco-centric approach. It is suggested that not only the public sector but also the private sector need to put more effort toward implement the schemes, and the government needs to encourage the private sector to adopt the schemes in practice.

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

2006-01-01T23:59:59.000Z

235

Quasi-explicit time-integration schemes for dynamic fracture with set-valued cohesive zone models  

Science Conference Proceedings (OSTI)

We investigate quasi-explicit time-integration schemes for solving dynamic fracture problems with set-valued cohesive zone models. These schemes combine a central difference time-integration scheme and a partially implicit and lumped treatment of the ... Keywords: Cohesive zone model, Finite elements, Time-integration scheme

D. Doyen; A. Ern; S. Piperno

2013-08-01T23:59:59.000Z

236

Further improvement and analysis of CCD scheme: Dissipation discretization and de-aliasing properties  

Science Conference Proceedings (OSTI)

In this paper, we further analyze a combined compact difference (CCD) scheme proposed recently [T.K. Sengupta, V. Lakshmanan, V.V.S.N. Vijay, A new combined stable and dispersion relation preserving compact scheme for non-periodic problems, J. Comput. ... Keywords: Aliasing property, Combined compact difference scheme, Dissipation discretization, Lid-driven cavity problem, Navier-Stokes solution, Receptivity of adverse pressure gradient boundary layers

T. K. Sengupta; V. V. S. N. Vijay; S. Bhaumik

2009-09-01T23:59:59.000Z

237

Enhanced Harmonic Up-Conversion Using a Hybrid HGHG-EEHG Scheme  

SciTech Connect

We introduce a novel harmonic generation scheme which can be used, for a given desired harmonic, to achieve higher bunching factors, weaker chicanes, and/or less final energy spread than can be achieved using Echo-Enabled Harmonic Generation. This scheme only requires a single laser with relatively low power, and is a hybrid of High-Gain Harmonic Generation and EEHG. We present a design of this scheme applied to the Next Generation Light Source (NGLS).

Marksteiner, Quinn R. [Los Alamos National Laboratory; Bishofberger, Kip A. [Los Alamos National Laboratory; Carlsten, Bruce E. [Los Alamos National Laboratory; Freund, Henry P. [Los Alamos National Laboratory; Yampolsky, Nikolai A. [Los Alamos National Laboratory

2012-04-30T23:59:59.000Z

238

A New Scheme for the Promotion of Renewable Energies in Developing...  

Open Energy Info (EERE)

New Scheme for the Promotion of Renewable Energies in Developing Countries: The Renewable Energy Regulated Purchase Tariff Jump to: navigation, search Tool Summary Name: A New...

239

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

E-Print Network (OSTI)

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

Stadler, Michael

2010-01-01T23:59:59.000Z

240

Enhancing reliability in passive anti-islanding protection schemes for distribution systems with distributed generation.  

E-Print Network (OSTI)

??This thesis introduces a new approach to enhance the reliability of conventional passive anti-islanding protection scheme in distribution systems embedding distributed generation. This approach uses (more)

Sheikholeslamzadeh, Mohsen

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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241

A conceptual scheme for focusing of high power microwaves in SYMPLE  

Science Conference Proceedings (OSTI)

The conceptual Scheme of Focusing the High pulsed microwave power generated by "VIRCATOR" on plasma produced in "SYMPLE", using Plasma Lens, is discussed.

Renu Bahl; K. Sathyanarayna; V. P. Anitha; Priyavandna J. Rathod; Y. C. Saxena

2011-02-01T23:59:59.000Z

242

Plasma ignition schemes for the SNS radio-frequency driven H- source  

E-Print Network (OSTI)

on the Spallation Neutron Source (SNS) Project, EPAC 98,ignition schemes for the SNS radio-frequency driven H -the Spallation Neutron Source (SNS) is a cesiated, radio-

2001-01-01T23:59:59.000Z

243

Critique of a Freeway On-Ramp Metering Scheme and Broader Related Issues  

E-Print Network (OSTI)

System wide adaptive ramp metering algorithm high levelA. (2000) Freeway ramp metering: an overview. Procs. IEEEThis means that, under the metering scheme, the N Q deferred

Cassidy, Michael J.

2002-01-01T23:59:59.000Z

244

High Energy Density Physics and Exotic Acceleration Schemes  

Science Conference Proceedings (OSTI)

The High Energy Density and Exotic Acceleration working group took as our goal to reach beyond the community of plasma accelerator research with its applications to high energy physics, to promote exchange with other disciplines which are challenged by related and demanding beam physics issues. The scope of the group was to cover particle acceleration and beam transport that, unlike other groups at AAC, are not mediated by plasmas or by electromagnetic structures. At this Workshop, we saw an impressive advancement from years past in the area of Vacuum Acceleration, for example with the LEAP experiment at Stanford. And we saw an influx of exciting new beam physics topics involving particle propagation inside of solid-density plasmas or at extremely high charge density, particularly in the areas of laser acceleration of ions, and extreme beams for fusion energy research, including Heavy-ion Inertial Fusion beam physics. One example of the importance and extreme nature of beam physics in HED research is the requirement in the Fast Ignitor scheme of inertial fusion to heat a compressed DT fusion pellet to keV temperatures by injection of laser-driven electron or ion beams of giga-Amp current. Even in modest experiments presently being performed on the laser-acceleration of ions from solids, mega-amp currents of MeV electrons must be transported through solid foils, requiring almost complete return current neutralization, and giving rise to a wide variety of beam-plasma instabilities. As keynote talks our group promoted Ion Acceleration (plenary talk by A. MacKinnon), which historically has grown out of inertial fusion research, and HIF Accelerator Research (invited talk by A. Friedman), which will require impressive advancements in space-charge-limited ion beam physics and in understanding the generation and transport of neutralized ion beams. A unifying aspect of High Energy Density applications was the physics of particle beams inside of solids, which is proving to be a very important field for diverse applications such as muon cooling, fusion energy research, and ultra-bright particle and radiation generation with high intensity lasers. We had several talks on these and other subjects, and many joint sessions with the Computational group, the EM Structures group, and the Beam Generation group. We summarize our groups' work in the following categories: vacuum acceleration schemes; ion acceleration; particle transport in solids; and applications to high energy density phenomena.

Cowan, T.; /General Atomics, San Diego; Colby, E.; /SLAC

2005-09-27T23:59:59.000Z

245

The Accuracy of a Finite-Element Vertical Discretization Scheme for Primitive Equation Models: Comparison with a Finite-Difference Scheme  

Science Conference Proceedings (OSTI)

The accuracy of a slightly modified version of the finite-element vertical discretization scheme first described in Staniforth and Daley is studied with respect to a set of Rossby and gravity analytical normal modes obtained as solutions of a ...

Michel Bland; Jean Ct; Andrew Staniforth

1983-12-01T23:59:59.000Z

246

SERAPHIM: A magnetic propulsion scheme for fast trains  

DOE Green Energy (OSTI)

We are attempting to develop and demonstrate a new type of linear synchronous induction motor capable of propelling a vehicle at high speed. The technology, based on a passive guideway containing sequential aluminum plates, was developed in Sandia`s electromagnetic launch program. As such, it was called a ``re-connection gun`` and launched an aluminum plate from between pairs of pancake coils. In the proposed propulsion scheme, the plates are fixed and the coils move. Pairs of closely spaced pancake coils on the vehicle straddle vertically mounted aluminum plates in the roadbed. The current in the coils is turned on when the plate is fully covered, peaks at some optimal time, and decreases to zero before separation. This induces currents in the plate which interact with the coil current to produce repulsive forces. In essence, the pulsed coils push off the edge of the plate because at the high frequency of operation, the current has insufficient time to fully penetrate. Since no embedded flux is required, the efficiency actually increases with speed. This concept has been named SERAPHIM, for SEgmented RAil PHased Induction Motor.

Marder, B.M.; Frost, C.A.; Lipinski, R.J.; Cowan, M.

1994-04-01T23:59:59.000Z

247

A CLASSIFICATION SCHEME FOR TURBULENT ACCELERATION PROCESSES IN SOLAR FLARES  

SciTech Connect

We establish a classification scheme for stochastic acceleration models involving low-frequency plasma turbulence in a strongly magnetized plasma. This classification takes into account both the properties of the accelerating electromagnetic field, and the nature of the transport of charged particles in the acceleration region. We group the acceleration processes as either resonant, non-resonant, or resonant-broadened, depending on whether the particle motion is free-streaming along the magnetic field, diffusive, or a combination of the two. Stochastic acceleration by moving magnetic mirrors and adiabatic compressions are addressed as illustrative examples. We obtain expressions for the momentum-dependent diffusion coefficient D(p), both for general forms of the accelerating force and for the situation when the electromagnetic force is wave-like, with a specified dispersion relation {omega} = {omega}(k). Finally, for models considered, we calculate the energy-dependent acceleration time, a quantity that can be directly compared with observations of the time profile of the radiation field produced by the accelerated particles, such as those occuring during solar flares.

Bian, Nicolas; Kontar, Eduard P. [School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ (United Kingdom); Emslie, A. Gordon, E-mail: n.bian@physics.gla.ac.uk, E-mail: eduard@astro.gla.ac.uk, E-mail: emslieg@wku.edu [Department of Physics and Astronomy, Western Kentucky University, Bowling Green, KY 42101 (United States)

2012-08-01T23:59:59.000Z

248

Balancedenergy sleep scheduling scheme for high density cluster-based sensor networks  

E-Print Network (OSTI)

Abstract In order to conserve battery power in very dense sensor networks, some sensor nodes may be put into the sleep state while other sensor nodes remain active for the sensing and communication tasks. However, determining which of the sensor nodes should be put into the sleep state is non-trivial. As the goal of allowing nodes to sleep is to extend network lifetime, we propose and analyze a Balanced-energy Scheduling (BS) scheme in the context of cluster-based sensor networks. The BS scheme aims to evenly distribute the energy load of the sensing and communication tasks among all the nodes in the cluster, thereby extending the time until the cluster can no longer provide adequate sensing coverage. Two related sleep scheduling schemes, the Distance-based Scheduling (DS) scheme and the Randomized Scheduling (RS) scheme are also studied in terms of the coefficient of variation of their energy consumption. Analytical and simulation results are presented to evaluate the proposed BS scheme. It is shown that the BS scheme extends the clusters overall network lifetime significantly while maintaining a similar sensing coverage compared with the DS and the RS schemes for sensor clusters. I.

Jing Deng; Yunghsiang S. Han; Wendi B. Heinzelman; Pramod K. Varshney

2004-01-01T23:59:59.000Z

249

EACLE: Energy-Aware Clustering Scheme with Transmission Power Control for Sensor Networks  

Science Conference Proceedings (OSTI)

In this paper, we propose a new energy efficient clustering scheme with transmission power control named "EACLE" (Energy-Aware CLustering scheme with transmission power control for sEnsor networks) for wireless sensor networks, which are composed of ... Keywords: clustering, energy efficiency, transmission power control, wireless sensor network

Kentaro Yanagihara; Jumpei Taketsugu; Kiyoshi Fukui; Shigeru Fukunaga; Shinsuke Hara; Ken-Ichi Kitayama

2007-02-01T23:59:59.000Z

250

Energy consumption analysis of reputation-based trust management schemes of wireless sensor networks  

Science Conference Proceedings (OSTI)

Energy consumption is one of the most important parameters for evaluation of a scheme proposed for WSNs because of their resource constraint nature. Comprehensive comparative analysis of proposed reputation-based trust management schemes of WSNs from ... Keywords: reputation, sensor networks, trust evaluation, trust management

Riaz Ahmed Shaikh; Young-Koo Lee; Sungyoung Lee

2009-02-01T23:59:59.000Z

251

Comparison of Leapfrog, Smolarkiewicz, and MacCormack Schemes Applied to Nonlinear Equations  

Science Conference Proceedings (OSTI)

The MacCormack scheme is a finite-difference scheme widely used in the aerospace simulations. It is a two-step algorithm, and contains a small amount of implicit numerical diffusion that makes it numerically stable without having to use any ...

Luis R. Mendez-Nunez; John J. Carroll

1993-02-01T23:59:59.000Z

252

The Mass-Conservative Cell-Integrated Semi-Lagrangian Advection Scheme on the Sphere  

Science Conference Proceedings (OSTI)

A mass-conservative cell-integrated semi-Lagrangian (CISL) scheme is presented and tested for 2D transport on the sphere. The total mass is conserved exactly and the mass of each individual grid cell is conserved in general. The scheme is based ...

Ramachandran D. Nair; Bennert Machenhauer

2002-03-01T23:59:59.000Z

253

Cabauw Experimental Results from the Project for Intercomparison of Land-Surface Parameterization Schemes  

Science Conference Proceedings (OSTI)

In the Project for Intercomparison of Land-Surface Parameterization Schemes phase 2a experiment, meteorological data for the year 1987 from Cabauw, the Netherlands, were used as inputs to 23 land-surface flux schemes designed for use in climate ...

T. H. Chen; A. Henderson-Sellers; P. C. D. Milly; A. J. Pitman; A. C. M. Beljaars; J. Polcher; F. Abramopoulos; A. Boone; S. Chang; F. Chen; Y. Dai; C. E. Desborough; R. E. Dickinson; L. Dmenil; M. Ek; J. R. Garratt; N. Gedney; Y. M. Gusev; J. Kim; R. Koster; E. A. Kowalczyk; K. Laval; J. Lean; D. Lettenmaier; X. Liang; J.-F. Mahfouf; H.-T. Mengelkamp; K. Mitchell; O. N. Nasonova; J. Noilhan; A. Robock; C. Rosenzweig; J. Schaake; C. A. Schlosser; J.-P. Schulz; Y. Shao; A. B. Shmakin; D. L. Verseghy; P. Wetzel; E. F. Wood; Y. Xue; Z.-L. Yang; Q. Zeng

1997-06-01T23:59:59.000Z

254

Finite difference schemes for the Schrodinger-Maxwell equations (with a general non-linear term)  

Science Conference Proceedings (OSTI)

In this paper, the Numerical Solution of the system of PDEs of Schrodinger-Maxwell equations (with a general nonlinear term) via an appropriate Finite Difference Scheme is introduced. The Existence and Uniqueness of the discretization of the system of ... Keywords: Schrodinger-Maxwell equations, finite difference, finite difference schemes

Nikos E. Mastorakis

2009-06-01T23:59:59.000Z

255

Co-ordination of Renewable Energy Support Schemes in the Stine Grenaa Jensen1  

E-Print Network (OSTI)

Co-ordination of Renewable Energy Support Schemes in the EU Stine Grenaa Jensen1 and Poul Erik for renewable energy are regionalised. Two theoretical examples are used to explain interactive effects on, e. In this case, introduction of a common TGC -support scheme for renewable technologies will lead to more

256

A box-type scheme for fractional sub-diffusion equation with Neumann boundary conditions  

Science Conference Proceedings (OSTI)

Combining order reduction approach and L1 discretization, a box-type scheme is presented for solving a class of fractional sub-diffusion equation with Neumann boundary conditions. A new inner product and corresponding norm with a Sobolev embedding inequality ... Keywords: Box-type scheme, Convergence, Energy method, Neumann boundary conditions, Stability, Sub-diffusion equation

Xuan Zhao; Zhi-zhong Sun

2011-07-01T23:59:59.000Z

257

Pareto-improving and revenue-neutral congestion pricing schemes in two-mode traffic networks  

Science Conference Proceedings (OSTI)

This paper studies a Pareto-improving and revenue-neutral congestion pricing scheme on a simple two-mode (highway and transit) network: this scheme aims at simultaneously improving system performance, making every individual user better off, and having ... Keywords: Congestion pricing, Pareto-improving, Revenue-neutral, Traffic equilibrium, Two-mode network

Yang Liu; Xiaolei Guo; Hai Yang

2009-04-01T23:59:59.000Z

258

Accelerated staggered coupling schemes for problems of thermoelasticity at finite strains  

Science Conference Proceedings (OSTI)

This paper introduces a fully implicit partitioned coupling scheme for problems of thermoelasticity at finite strains utilizing the p-version of the finite element method. The mechanical and the thermal fields are partitioned into symmetric subproblems ... Keywords: Convergence acceleration, Partitioned coupling schemes, Thermoelasticity, Time adaptivity

Patrick Erbts; Alexander DSter

2012-10-01T23:59:59.000Z

259

Fourth-Order Horizontal Advection Schemes on the Semi-staggered Grid  

Science Conference Proceedings (OSTI)

Horizontal advection schemes on the semi-staggered grid E are presented, which in their linearized versions have a fourth-order space accuracy. The first is a scheme for evaluation of the horizontal nonlinear terms in the momentum equation. It ...

Miodrag Ranc?i?

1988-06-01T23:59:59.000Z

260

An Energy-Efficient Cooperative Node Selction Scheme in Wireless Sensor Networks  

Science Conference Proceedings (OSTI)

In this paper, we propose a novel cooperative node selection scheme in wireless sensor networks that operate in energy-constrained environment. This scheme can obtain higher energy efficiency than the traditional cooperative transmission, which only ... Keywords: cooperative node selection, energy effiency, wireless sensor networks

Yu Zhang; Yueming Cai; Wendong Yang; Youyun Xu

2009-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

Decision of optimal scheduling scheme for gas field pipeline network based on hybrid genetic algorithm  

Science Conference Proceedings (OSTI)

A mathematical model of optimal scheduling scheme for natural gas pipeline network is established, which takes minimal annual operating cost of compressor stations as objective function after comprehensively considering the resources of gas field, operating ... Keywords: differential evolution algorithm, genetic algorithm, natural gas pipeline network, optimization, scheduling scheme

Wu Liu; Min Li; Yi Liu; Yuan Xu; Xinglan Yang

2009-06-01T23:59:59.000Z

262

Evaluation of a Modified Scheme for Shallow Convection: Implementation of CuP and Case Studies  

Science Conference Proceedings (OSTI)

A new treatment for shallow clouds has been introduced into the Weather Research and Forecasting Model (WRF). The new scheme, called the cumulus potential (CuP) scheme, replaces the ad hoc trigger function used in the KainFritsch cumulus ...

Larry K. Berg; William I. Gustafson Jr.; Evgueni I. Kassianov; Liping Deng

2013-01-01T23:59:59.000Z

263

Adaptive Schemes for Home-based DSM Systems School of Computing  

E-Print Network (OSTI)

Adaptive Schemes for Home-based DSM Systems M.C. Ng School of Computing National University Home-based consistency model, a variant of lazy release consistency model (LRC), is a recent, we present 2 adaptive schemes for home-based DSM systems: home migration and dynamic adaptation

Wong, Weng Fai

264

Preventing numerical errors generated by interface-capturing schemes in compressible multi-material flows  

Science Conference Proceedings (OSTI)

In the present work, errors generated in computations of compressible multi-material flows using shock-capturing schemes are examined, specifically pressure oscillations (when the specific heats ratio is variable), but also temperature spikes and species ... Keywords: High-order accurate schemes, Interface capturing, Material discontinuities, Multi-material flows, Multifluid algorithms, Shock capturing, WENO

Eric Johnsen; Frank Ham

2012-07-01T23:59:59.000Z

265

Efficient kinetic schemes for steady and unsteady flow simulations on unstructured meshes  

Science Conference Proceedings (OSTI)

This paper presents efficient second-order kinetic schemes on unstructured meshes for both compressible unsteady and incompressible steady flows. For compressible unsteady flows, a time-dependent gas distribution function with a discontinuous particle ... Keywords: Compressible unsteady flows, Efficient second-order kinetic schemes, Incompressible steady flows, Unstructured meshes

Guoxi Ni; Song Jiang; Kun Xu

2008-03-01T23:59:59.000Z

266

The security of the Fiat--Shamir scheme in the presence of transient hardware faults  

Science Conference Proceedings (OSTI)

Implementation cryptanalysis has emerged as a realistic threat for cryptographic systems. It consists of two classes of attacks: fault-injection and side-channel attacks. In this work, we examine the resistance of the Fiat--Shamir scheme to fault-injection ... Keywords: Bellcore attack, Fiat--Shamir identification scheme, cryptography, side-channel attacks, smartcards

Artemios G. Voyiatzis; Dimitrios N. Serpanos

2008-04-01T23:59:59.000Z

267

Sensitivity of the BiosphereAtmosphere Transfer Scheme (BATS) to the Inclusion of Variable Soil Characteristics  

Science Conference Proceedings (OSTI)

The soils data of Wilson and Henderson-Sellers have been incorporated into the land-surface parameterization scheme of the NCAR Community Climate Model after Dickinson. A stand-alone version of this land-surface scheme, termed the Biosphere-...

M. F. Wilson; A. Henderson-Sellers; R. E. Dickinson; P. J. Kennedy

1987-03-01T23:59:59.000Z

268

Evaluation of Three Planetary Boundary Layer Schemes in the WRF Model XIAO-MING HU  

E-Print Network (OSTI)

of air from above the PBL. A sensitivity experiment with the ACM2 scheme confirms this diagnosis. 1 the planetary boundary layer (PBL), is important for air pollution modeling, and PBL parameterization schemes­Yamada­Janjic (MYJ), Yonsei University (YSU), and the asymmetric convective model, version 2 (ACM2)]. Comparison

269

PARABOLIC SCHEMES FOR QUASI-LINEAR PARABOLIC AND HYPERBOLIC PDES VIA STOCHASTIC CALCULUS  

E-Print Network (OSTI)

PARABOLIC SCHEMES FOR QUASI-LINEAR PARABOLIC AND HYPERBOLIC PDES VIA STOCHASTIC CALCULUS SEBASTIEN of a unique global strong solution for the parabolic system. We show the existence of a unique local strong not use weak solution theory but recursive parabolic schemes studied via a stochastic approach

Paris-Sud XI, Université de

270

Nonequilibrium molecular dynamics simulation of shear viscosity by a uniform momentum source-and-sink scheme  

Science Conference Proceedings (OSTI)

A uniform momentum source-and-sink scheme of nonequilibrium molecular dynamics (NEMD) is developed to calculate the shear viscosity of fluids in this paper. The uniform momentum source and sink are realized by momentum exchanges of individual atoms in ... Keywords: Molecular fluid, Nonequilibrium molecular dynamics, Shear viscosity, Uniform source-and-sink scheme

Bing-Yang Cao; Ruo-Yu Dong

2012-06-01T23:59:59.000Z

271

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

E-Print Network (OSTI)

Cluster-based information retrieval systems often use a similarity measure to compute the association among text documents. In this thesis, we focus on a class of similarity measures named Query-Sensitive Similarity (QSS) measures. Recent studies 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 and demonstrated better retrieval performance relative to the latter. We test whether introducing one of these schemes, INQUERY, will offer any benefit over the ltc scheme when used in the context of QSS measures. The testing procedure uses the Nearest Neighbor (NN) test to quantify the clustering effectiveness of QSS measures and the corresponding term-weighting scheme. The NN tests are applied on certain standard test document collections and the results are tested for statistical significance. On analyzing results of the NN test relative to those obtained for the ltc scheme, we find several instances where the INQUERY scheme improves the clustering effectiveness of QSS measures. To be able to apply the NN test, we designed a software test framework, Ferret, by complementing the features provided by dtSearch, a search engine. The test framework automates the generation of NN coefficients by processing standard test document collection data. We provide an insight into the construction and working of the Ferret test framework.

Kini, Ananth Ullal

2005-12-01T23:59:59.000Z

272

A New Signature-Based Indexing Scheme for Trajectories of Moving Objects on Spatial Networks  

Science Conference Proceedings (OSTI)

Because moving objects usually move on spatial networks, their trajectories play an important role in indexing them for spatial network databases. In this paper, we propose a new signature-based indexing scheme for moving objects' trajectories on spatial ... Keywords: signature-based index scheme, spatial network, trajectory

Jaewoo Chang; Jungho Um; Youngjin Kim

2008-06-01T23:59:59.000Z

273

Comparative study of multicast authentication schemes with application to wide-area measurement system  

Science Conference Proceedings (OSTI)

Multicasting refers to the transmission of a message to multiple receivers at the same time. To enable authentication of sporadic multicast messages, a conventional digital signature scheme is appropriate. To enable authentication of a multicast data ... Keywords: multicast authentication, multiple-time signature scheme, smart grid, wide-area measurement system

Yee Wei Law, Zheng Gong, Tie Luo, Slaven Marusic, Marimuthu Palaniswami

2013-05-01T23:59:59.000Z

274

Medusa: a novel stream-scheduling scheme for parallel video servers  

Science Conference Proceedings (OSTI)

Parallel video servers provide highly scalable video-on-demand service for a huge number of clients. The conventional stream-scheduling scheme does not use I/O and network bandwidth efficiently. Some other schemes, such as batching and stream merging, ... Keywords: multicast, stream batching, stream merging, unicast, video-on-demand

Hai Jin; Dafu Deng; Liping Pang

2004-01-01T23:59:59.000Z

275

Performance analysis of different checkpointing and recovery schemes using stochastic model  

Science Conference Proceedings (OSTI)

Several schemes for checkpointing and rollback recovery have been reported in the literature. In this paper, we analyze some of these schemes under a stochastic model. We have derived expressions for average cost of checkpointing, rollback recovery, ... Keywords: checkpointing, message logging, performance evaluation, rollback recovery

Partha Sarathi Mandal; Krishnendu Mukhopadhyaya

2006-01-01T23:59:59.000Z

276

Overview and comparison of global concentrating solar power incentives schemes by means of computational models  

Science Conference Proceedings (OSTI)

The present paper gives an updated picture of concentrating solar power incentives schemes in the World. It resumes the main figures of the incentives schemes per Country such as plant size limit, feed-in tariff value, duration, inflation recovery and ... Keywords: concentrating solar power, feed-in-tariff

M. Villarini; M. Limiti; R. Impero Abenavoli

2007-06-01T23:59:59.000Z

277

An Energy and Angular-Momentum Conserving Vertical Finite-Difference Scheme and Hybrid Vertical Coordinates  

Science Conference Proceedings (OSTI)

An energy and angular-momentum conserving vertical finite-difference scheme is introduced for a general terrain-following vertical coordinate which is a function of pressure and its surface value. A corresponding semi-implicit time scheme is also ...

A. J. Simmons; D. M. Burridge

1981-04-01T23:59:59.000Z

278

An Efficient Energy Curtailment Scheme For Outage Management in Smart Grid  

E-Print Network (OSTI)

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

Durrani, Salman

279

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

E-Print Network (OSTI)

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.

J. E. Hirsch

2009-01-26T23:59:59.000Z

280

Uncorrelated two-state single molecule trajectories from reducible kinetic schemes  

E-Print Network (OSTI)

Trajectories of on-off events are the output of many single molecule experiments. Usually, one describes the underlying mechanism that generates the trajectory using a kinetic scheme, and by analyzing the trajectory aims at deducing this scheme. In a previous work [O. Flomenbom, J. Klafter, and A. Szabo, submitted (2004)], we showed that when successive events along a trajectory are uncorrelated, all the information in the trajectory is contained in two basic functions, which are the waiting time probability functions (PDFs) of the on state and of the off state. The kinetic schemes that lead to such uncorrelated trajectories were termed reducible. Here we discuss the reasons that lead to reducible schemes. In particular, the topology of reducible schemes is characterized and proven.

Ophir Flomenbom; Joseph Klafter

2005-01-20T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Delgado-Frias, A Mesochronous Pipelining Scheme for High-Performance Digital Systems  

E-Print Network (OSTI)

AbstractA novel mesochronous pipelining scheme is described in this paper. In this scheme, data and clock travel together. At any given time a pipeline stage could be operating on more than one data wave. The clock period in the proposed pipeline scheme is determined by the pipeline stage with largest difference between its minimum and maximum delays. This is a significant performance gain compared to conventional pipeline scheme where clock period is determined by the stage with the largest delay. A detailed analysis of the clock period constraints is provided to show the performance gains and of mesochronous pipelining over other pipelining schemes. Also, the number of pipeline stages and pipeline registers is small. The clock distribution scheme is simple in the mesochronous pipeline architecture. An 8 8-bit carry-save adder multiplier has been implemented in mesochronous pipeline architecture using modest TSMC 180-nm (drawn length 200 nm) CMOS technology. The multiplier architecture and simulation results are described in detail in this paper. The pipelined multiplier is able to operate on a clock period of 350 ps (2.86 GHz). This is a of 1.7 times over conventional pipeline scheme, with fewer pipeline stages and pipeline registers. Index TermsHigh performance, mesochronous pipeline, multiplier, pipelined system, register delays. I.

Suryanarayana B. Tatapudi; Student Member; Jos G. Delgado-frias; Senior Member

2006-01-01T23:59:59.000Z

282

A computerized scheme for lung nodule detection in multiprojection chest radiography  

SciTech Connect

Purpose: Our previous study indicated that multiprojection chest radiography could significantly improve radiologists' performance for lung nodule detection in clinical practice. In this study, the authors further verify that multiprojection chest radiography can greatly improve the performance of a computer-aided diagnostic (CAD) scheme. Methods: Our database consisted of 59 subjects, including 43 subjects with 45 nodules and 16 subjects without nodules. The 45 nodules included 7 real and 38 simulated ones. The authors developed a conventional CAD scheme and a new fusion CAD scheme to detect lung nodules. The conventional CAD scheme consisted of four steps for (1) identification of initial nodule candidates inside lungs, (2) nodule candidate segmentation based on dynamic programming, (3) extraction of 33 features from nodule candidates, and (4) false positive reduction using a piecewise linear classifier. The conventional CAD scheme processed each of the three projection images of a subject independently and discarded the correlation information between the three images. The fusion CAD scheme included the four steps in the conventional CAD scheme and two additional steps for (5) registration of all candidates in the three images of a subject, and (6) integration of correlation information between the registered candidates in the three images. The integration step retained all candidates detected at least twice in the three images of a subject and removed those detected only once in the three images as false positives. A leave-one-subject-out testing method was used for evaluation of the performance levels of the two CAD schemes. Results: At the sensitivities of 70%, 65%, and 60%, our conventional CAD scheme reported 14.7, 11.3, and 8.6 false positives per image, respectively, whereas our fusion CAD scheme reported 3.9, 1.9, and 1.2 false positives per image, and 5.5, 2.8, and 1.7 false positives per patient, respectively. The low performance of the conventional CAD scheme may be attributed to the high noise level in chest radiography, and the small size and low contrast of most nodules. Conclusions: This study indicated that the fusion of correlation information in multiprojection chest radiography can markedly improve the performance of CAD scheme for lung nodule detection.

Guo Wei; Li Qiang; Boyce, Sarah J.; McAdams, H. Page; Shiraishi, Junji; Doi, Kunio; Samei, Ehsan [Carl E. Ravin Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, Durham, North Carolina 27705 and College of Information Science and Engineering, Northeastern University, Shenyang, Liaoning 110004 (China); Carl E. Ravin Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, Durham, North Carolina 27705 (United States); Carl E. Ravin Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, Durham, North Carolina 27705 and Department of Biomedical Engineering, University of North Carolina, Chapel Hill, North Carolina 27599 (United States); Carl E. Ravin Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, Durham, North Carolina 27705 (United States); Faculty of Life Sciences, Kumamoto University, 4-24-1 Kuhonji, Kumamoto 962-0976 (Japan); Kurt Rossmann Laboratories for Radiologic Image Research, Department of Radiology, University of Chicago, Chicago, Illinois 60637 (United States); Carl E. Ravin Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, Durham, North Carolina 27705 and Departments of Physics, Biomedical Engineering, Electrical and Computer Engineering, and Medical Physics, Duke University, Durham, North Carolina 27705 (United States)

2012-04-15T23:59:59.000Z

283

The Chamomile Scheme: An Optimized Algorithm for N-body simulations on Programmable Graphics Processing Units  

E-Print Network (OSTI)

We present an algorithm named "Chamomile Scheme". The scheme is fully optimized for calculating gravitational interactions on the latest programmable Graphics Processing Unit (GPU), NVIDIA GeForce8800GTX, which has (a) small but fast shared memories (16 K Bytes * 16) with no broadcasting mechanism and (b) floating point arithmetic hardware of 500 Gflop/s but only for single precision. Based on this scheme, we have developed a library for gravitational N-body simulations, "CUNBODY-1", whose measured performance reaches to 173 Gflop/s for 2048 particles and 256 Gflop/s for 131072 particles.

Tsuyoshi Hamada; Toshiaki Iitaka

2007-03-06T23:59:59.000Z

284

Predicting Mesoscale Variability of the North Atlantic Using a Physically Motivated Scheme for Assimilating Altimeter and Argo Observations  

Science Conference Proceedings (OSTI)

A computationally efficient scheme is described for assimilating sea level measured by altimeters and vertical profiles of temperature and salinity measured by Argo floats. The scheme is based on a transformation of temperature, salinity, and sea ...

Yimin Liu; Keith R. Thompson

2009-07-01T23:59:59.000Z

285

Numerical Solution to Drop Coalescence/Breakup with a Volume-Conserving, Positive-Definite, and Unconditionally Stable Scheme  

Science Conference Proceedings (OSTI)

This paper discusses a new volume- and volume concentrationconserving, positive-definite, unconditionally stable iterative numerical scheme for solving temporary cloud/raindrop coalescence followed by breakup and the coupling of the scheme with ...

M. Z. Jacobson

2011-02-01T23:59:59.000Z

286

Application of the Multigrid Data Assimilation Scheme to the China Seas Temperature Forecast  

Science Conference Proceedings (OSTI)

Correlation scales have been used in the traditional scheme of three-dimensional variational data assimilation (3DVAR) to estimate the background (or first guess) error covariance matrix (the matrix in brief) for the numerical forecast and ...

Wei Li; Yuanfu Xie; Zhongjie He; Guijun Han; Kexiu Liu; Jirui Ma; Dong Li

2008-11-01T23:59:59.000Z

287

Evaluation of Two Land Surface Schemes Used in Terrains of Increasing Aridity in West Africa  

Science Conference Proceedings (OSTI)

In this study different parameterizations for land surface models currently employed in meteorological models at ECMWF [Tiled ECMWF Surface Scheme for Exchange Processes over Land (TESSEL)] and NCEP (Noah) are evaluated for a semiarid region in ...

D. Schttemeyer; A. F. Moene; A. A. M. Holtslag; H. A. R. de Bruin

2008-04-01T23:59:59.000Z

288

Diurnal to Annual Precipitation Sensitivity to Convective and Land Surface Schemes  

Science Conference Proceedings (OSTI)

Precipitations diurnal to annual variance distribution and atmospheric water cycle component interactions are examined globally for sensitivity to convective and land surface schemes. The main regional features of statistics identified in ...

Alex C. Ruane; John O. Roads

2008-06-01T23:59:59.000Z

289

The Relation between Moist Convective Adjustment Schemes and the Mass-Flux Concept for Cumulus Parameterization  

Science Conference Proceedings (OSTI)

The problem of finding convective mass fluxes and convective condensation rates in moist convective adjustment schemes for cumulus parameterization in numerical weather prediction is addressed. Formal considerations reveal that, in general, it is ...

Peter Binder

1993-12-01T23:59:59.000Z

290

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

E-Print Network (OSTI)

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. ...

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

2008-01-01T23:59:59.000Z

291

A Local Formulation of the Ensemble Transform (ET) Analysis Perturbation Scheme  

Science Conference Proceedings (OSTI)

Following ideas from the local ensemble transform Kalman filter, a local formulation of the ensemble transform (ET) analysis perturbation scheme is developed by partitioning the numerical weather prediction model domain into latitude bands or ...

Justin McLay; Craig H. Bishop; Carolyn A. Reynolds

2010-06-01T23:59:59.000Z

292

Application of the MacCormack Scheme to Atmospheric Nonhydrostatic Models  

Science Conference Proceedings (OSTI)

In a previous paper, the authors discussed the numerical properties of the MacCormack scheme, a finite-difference technique widely used in aerospace simulations. Here the authors report results of its application to the simulation, in two ...

Luis R. Mendez-Nunez; John J. Carroll

1994-05-01T23:59:59.000Z

293

The Interplay between Transpiration and Runoff Formulations in Land Surface Schemes Used with Atmospheric Models  

Science Conference Proceedings (OSTI)

The Project for Intercomparison of Land-surface Parameterization Schemes (PILPS) has shown that different land surface models (LSMs) driven by the same meteorological forcing can produce markedly different surface energy and water budgets, even ...

Randal D. Koster; P. C. D. Milly

1997-07-01T23:59:59.000Z

294

The Rhne-Aggregation Land Surface Scheme Intercomparison Project: An Overview  

Science Conference Proceedings (OSTI)

The Rhne-Aggregation (Rhne-AGG) Land Surface Scheme (LSS) intercomparison project is an initiative within the Global Energy and Water Cycle Experiment (GEWEX)/Global LandAtmosphere System Study (GLASS) panel of the World Climate Research ...

A. Boone; F. Habets; J. Noilhan; D. Clark; P. Dirmeyer; S. Fox; Y. Gusev; I. Haddeland; R. Koster; D. Lohmann; S. Mahanama; K. Mitchell; O. Nasonova; G.-Y. Niu; A. Pitman; J. Polcher; A. B. Shmakin; K. Tanaka; B. van den Hurk; S. Vrant; D. Verseghy; P. Viterbo; Z.-L. Yang

2004-01-01T23:59:59.000Z

295

Adaptive Rate and Power Allocation Schemes for OFDM/SDMA Systems  

Science Conference Proceedings (OSTI)

In this paper, adaptive resource allocation approaches, which jointly adapts power distribution and subcarrier allocation according to instantaneous channel conditions, is proposed for uplink OFDM/SDMA-based multiuser system. The first scheme utilizes ...

Behrouz Maham; Esrafil Jedari; Alireza Enayati

2007-08-01T23:59:59.000Z

296

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

E-Print Network (OSTI)

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 ...

Lacombe, Romain H

2008-01-01T23:59:59.000Z

297

A Factorial Assessment of the Sensitivity of the BATS Land-Surface Parameterization Scheme  

Science Conference Proceedings (OSTI)

Land-surface schemes developed for incorporation into global climate models include parameterizations that are not yet fully validated and depend upon the specification of a large (2050) number of ecological and soil parameters, the values of ...

A. Henderson-Sellers

1993-02-01T23:59:59.000Z

298

On the MellorYamada Turbulence Closure Scheme: The Surface Boundary Condition for q2  

Science Conference Proceedings (OSTI)

A numerical model that uses a level-2 turbulence closure scheme is used to compare two boundary conditions for the turbulent energy at the airsea interface. One boundary condition, the most commonly used, sets the turbulent kinetic energy ...

Michael W. Stacey; Stephen Pond

1997-10-01T23:59:59.000Z

299

A Perfect Prognosis Scheme for Forecasting Warm-Season Lightning over Florida  

Science Conference Proceedings (OSTI)

This study develops and evaluates a statistical scheme for forecasting warm-season lightning over Florida. Four warm seasons of analysis data from the Rapid Update Cycle (RUC) and lightning data from the National Lightning Detection Network are ...

Phillip E. Shafer; Henry E. Fuelberg

2008-06-01T23:59:59.000Z

300

An Automated Classification Scheme Designed to Better Elucidate the Dependence of Ozone on Meteorology  

Science Conference Proceedings (OSTI)

This paper utilizes a two-stage (average linkage then convergent k means) clustering approach as part of an automated meteorological classification scheme designed to better elucidate the dependence of ozone on meteorology. When applied to 10 ...

Brian K. Eder; Jerry M. Davis; Peter Bloomfield

1994-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

Data Assimilation via Error Subspace Statistical Estimation.Part I: Theory and Schemes  

Science Conference Proceedings (OSTI)

A rational approach is used to identify efficient schemes for data assimilation in nonlinear oceanatmosphere models. The conditional mean, a minimum of several cost functionals, is chosen for an optimal estimate. After stating the present goals ...

P. F. J. Lermusiaux; A. R. Robinson

1999-07-01T23:59:59.000Z

302

Quadratic Galerkin Finite Element Schemes for the Vertical Discretization of Numerical Forecast Models  

Science Conference Proceedings (OSTI)

A finite element scheme with second-order basis functions is introduced for vertical discretization using a spectral model for horizontal discretization. The basis functions are required to be continuous, and no assumption is made concerning the ...

J. Steppeler

1987-08-01T23:59:59.000Z

303

Operational Implementation of the FritschChappell Convective Scheme in the 24-km Canadian Regional Model  

Science Conference Proceedings (OSTI)

The objective and subjective evaluations that led to the implementation of the Fritsch and Chappell (FC) convective scheme in the new 24-km Canadian operational regional model are described in this study. Objective precipitation scores computed ...

Stphane Blair; Andr Mthot; Jocelyn Mailhot; Bernard Bilodeau; Alain Patoine; Grard Pellerin; Jean Ct

2000-06-01T23:59:59.000Z

304

A Density Current Parameterization Coupled with Emanuels Convection Scheme. Part I: The Models  

Science Conference Proceedings (OSTI)

The aim of the present series of papers is to develop a density current parameterization for global circulation models. This first paper is devoted to the presentation of this new wake parameterization coupled with Emanuels convective scheme. ...

Jean-Yves Grandpeix; Jean-Philippe Lafore

2010-04-01T23:59:59.000Z

305

An Operational Statistical Typhoon Intensity Prediction Scheme for the Western North Pacific  

Science Conference Proceedings (OSTI)

The current version of the Statistical Typhoon Intensity Prediction Scheme (STIPS) used operationally at the Joint Typhoon Warning Center (JTWC) to provide 12-hourly tropical cyclone intensity guidance through day 5 is documented. STIPS is a ...

John A. Knaff; Charles R. Sampson; Mark DeMaria

2005-08-01T23:59:59.000Z

306

Comparison of some optimisation techniques for numerical schemes discretising equations with advection terms  

Science Conference Proceedings (OSTI)

We have considered the measures of errors devised by Tam and Webb (1993), Bogey and Bailly (2002) and by Berland et al. (2007) to construct low dispersion, low dissipation and high order numerical schemes in computational aeroacoustics. We modify their ...

Appanah Rao Appadu

2012-03-01T23:59:59.000Z

307

A New Look at Richardson Number Mixing Schemes for Equatorial Ocean Modeling  

Science Conference Proceedings (OSTI)

A reexamination of turbulence dissipation measurements from the equatorial Pacific shows that the turbulence diffusivities are not a simple function of the gradient Richardson number. A widely used mixing scheme, the K-profile parameterization, ...

Edward D. Zaron; James N. Moum

2009-10-01T23:59:59.000Z

308

Controls modelling and verification for the Pacific Intertie HVDC 4 terminal scheme  

Science Conference Proceedings (OSTI)

A detailed digital model for the actual control system of the Pacific Intertie HVDC scheme is presented. The scheme is operated as multi-terminal bipole HVDC with four terminals in parallel. Each pole comprises two separately located converter station with independent converter controls at each end of the transmission line. The control model includes bipole, pole, station and converter control systems. Special control techniques for providing safe and stable operation of the parallel converters are described. The techniques also result in fast recovery of the HVDC transmission scheme following severe ac and dc system disturbances. Verification of the completeness and accuracy of the model are made using field tests made on the actual HVDC scheme.

Hammad, A.; Minghetti, R.; Hasler, J.; Eicher, P. (ABB Power Systems, Baden (Switzerland)); Bunch, R.; Goldsworthy, D. (Bonneville Power Administration, Portland, OR (United States))

1993-01-01T23:59:59.000Z

309

Characteristics of the RAW Filtered Leapfrog Time-stepping Scheme in the Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

The Robert-Asselin-Williams (RAW) filtered leapfrog scheme is implemented and tested in the Taiwan multi-scale community ocean model (TIMCOM). The characteristics of the RAW filter are carefully examined through two benchmark tests (the classical ...

Chih-Chieh Young; Yu-Chiao Liang; Yu-Heng Tseng; Chun-Hoe Chow

310

Semiprognostic Tests of KuoType Cumulus Parameterization Schemes in an Extratropical Convective System  

Science Conference Proceedings (OSTI)

Heat and moisture budgets associated with a midlatitude convective system (1011 April 1979) are used to evaluate several versions of Kuo-type cumulus parameterization schemes on a semiprognostic basis.

Ying-Hwa Kuo; Richard A. Anthes

1984-08-01T23:59:59.000Z

311

Evaluation and Improvement of an Iterative Scattering Correction Scheme for in situ Absorption and Attenuation Measurements  

Science Conference Proceedings (OSTI)

The performance of several scattering correction schemes for reflecting-tube absorption and beam attenuation measurements is evaluated with data collected in European shelf seas. Standard scattering correction procedures for absorption ...

David McKee; Jacek Piskozub; Rdiger Rttgers; Rick A. Reynolds

2013-07-01T23:59:59.000Z

312

Comparison of Two Classical Advection Schemes in a General Circulation Model  

Science Conference Proceedings (OSTI)

The authors compare two classical advection schemes, the centered difference and weighted upcurrent, for coarse-resolution OGCMs, using an idealized ocean basin and a realistic World Ocean topography. For the idealized basin, three experiments ...

Yasuhiro Yamanaka; Ryo Furue; Hiroyasu Hasumi; Nobuo Suginohara

2000-09-01T23:59:59.000Z

313

Representation of Water Table Dynamics in a Land Surface Scheme. Part II: Subgrid Variability  

Science Conference Proceedings (OSTI)

A lumped unconfined aquifer model has been developed and interactively coupled to a land surface scheme in a companion paper. Here, the issue of the representation of subgrid variability of water table depths (WTDs) is addressed. A statistical...

Pat J-F. Yeh; Elfatih A. B. Eltahir

2005-06-01T23:59:59.000Z

314

An Operation-Based Scheme for a Multiyear and Multipurpose Reservoir to Enhance Macroscale Hydrologic Models  

Science Conference Proceedings (OSTI)

This paper develops an operation-based numerical scheme for simulating storage in and outflow from a multiyear and multipurpose reservoir at a daily time step in order to enhance the simulation capacity of macroscale land surface hydrologic ...

Yiping Wu; Ji Chen

2012-02-01T23:59:59.000Z

315

A Simplified Scheme to Simulate Asymmetries Due to the Beta Effect in Barotropic Vortices  

Science Conference Proceedings (OSTI)

A simplified scheme to generate vortex asymmetries due to the beta effect from an initially symmetric vortex on a beta plane is described. This approach, based on the time integration of the nondivergent barotropic vorticity equation, was ...

Rebecca J. Ross; Yoshio Kurihara

1992-09-01T23:59:59.000Z

316

Using a Stochastic Kinetic Energy Backscatter Scheme to Improve MOGREPS Probabilistic Forecast Skill  

Science Conference Proceedings (OSTI)

An improved stochastic kinetic energy backscatter scheme, version 2 (SKEB2) has been developed for the Met Office Global and Regional Ensemble Prediction System (MOGREPS). Wind increments at each model time step are derived from a streamfunction ...

Warren J. Tennant; Glenn J. Shutts; Alberto Arribas; Simon A. Thompson

2011-04-01T23:59:59.000Z

317

An Examination of Some Simple Numerical Schemes for Calculating Scalar Advection  

Science Conference Proceedings (OSTI)

The computational damping and dispersion errors of some simple numerical schemes for calculating the advection of a scalar are analyzed. Computation times and accuracy are compared in calculating the two-dimensional transport of a symmetrical ...

P. E. Long Jr.; D. W. Pepper

1981-02-01T23:59:59.000Z

318

A Simple Parameterization Scheme for Joint Statistics of Cloud Field Morphology and Physical Parameters  

Science Conference Proceedings (OSTI)

A simple parameterization scheme for the joint statistics of cloud field morphology and other cloud parameters is discussed. The statistics of the cloud field morphology an obtained from the NOAA-9 AVHRR using the Hit or Miss image ...

T. J. Davis

1990-08-01T23:59:59.000Z

319

Improving the Efficiency of a Digital Filtering Scheme for Diabatic Initialization  

Science Conference Proceedings (OSTI)

A method of diabatic initialization is described in which a nonrecursive digital filter is applied to both the backward (adiabatic) and forward (diabatic) steps. It has clear advantages over previously proposed schemes: the initialization ...

Peter Lynch; Dominique Giard; Vladimir Ivanovici

1997-08-01T23:59:59.000Z

320

Improved Radiative Transfer Calculations from Information Provided by Bulk Microphysical Schemes  

Science Conference Proceedings (OSTI)

Bulk microphysical schemes are providing increasingly detailed information of hydrometeor profiles both within and below clouds. This information can be used to improve radiative transfer calculations with little increase in computation time. In ...

J. C. Petch

1998-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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321

Comparison of Ice-Phase Microphysical Parameterization Schemes Using Numerical Simulations of Tropical Convection  

Science Conference Proceedings (OSTI)

A numerical cloud model is used to evaluate the performance of several ice parameterizations. Results from simulations using these schemes are contrasted with each other, with an ice-free control simulation, and with observations to determine to ...

Michale McCumber; Wei-Kuo Tao; Joanne Simpson; Richard Penc; Su-Tzai Soong

1991-07-01T23:59:59.000Z

322

Region based QIM digital watermarking scheme for image database in DCT domain  

Science Conference Proceedings (OSTI)

This paper proposes a region based digital watermarking scheme to serve the purpose of copyright protection and integrity verification of image database using discrete cosine transform (DCT). The objective is achieved by embedding watermark into visually ...

Amit Phadikar; Santi P. Maity; Bhupendra Verma

2011-05-01T23:59:59.000Z

323

Linearization of a Simple Moist Convection Scheme for Large-Scale NWP Models  

Science Conference Proceedings (OSTI)

A simple Kuo-type convection scheme with an improved closure based on moist enthalpy accession (Kuo symmetric) has been linearized for the tangent-linear (TL) and adjoint (AD) versions of the Global Environmental Multiscale (GEM) model. The ...

Jean-Franois Mahfouf

2005-06-01T23:59:59.000Z

324

Simulation of Atmospheric Boundary Layer Processes Using Local- and Nonlocal-Closure Schemes  

Science Conference Proceedings (OSTI)

A soilvegetationatmospheric boundary layer model was developed to study the performance of two local-closure and two nonlocal-closure boundary layer mixing schemes for use in meteorological and air quality simulation models. Full interaction ...

Kiran Alapaty; Jonathan E. Pleim; Sethu Raman; Devdutta S. Niyogi; Daewon W. Byun

1997-03-01T23:59:59.000Z

325

Effects of Upstream-Biased Third-Order Space Correction Terms on Multidimensional Crowley Advection Schemes  

Science Conference Proceedings (OSTI)

Several authors have improved the stability or conservation accuracy of the highly popular second-order Crowley advective differencing scheme in multidimensional flow. However, these improved versions still have the marked dispersive phase lag of ...

Robert E. Schlesinger

1985-07-01T23:59:59.000Z

326

A new data-mapping scheme for latency-tolerant distributed sparse triangular solution  

Science Conference Proceedings (OSTI)

This paper concerns latency-tolerant schemes for the efficient parallel solution of sparse triangular linear systems on distributed memory multiprocessors. Such triangular solution is required when sparse Cholesky factors are used to solve for a sequence ...

Keita Teranishi; Padma Raghavan; Esmond Ng

2002-11-01T23:59:59.000Z

327

Evaluations of BDA Scheme Using the Advanced Research WRF (ARW) Model  

Science Conference Proceedings (OSTI)

A tropical cyclone bogus data assimilation (BDA) scheme is built in the Weather Research and Forecasting three-dimensional variational data assimilation system (WRF 3D-VAR). Experiments were conducted (21 experiments with BDA in parallel with ...

Qingnong Xiao; Liqiang Chen; Xiaoyan Zhang

2009-03-01T23:59:59.000Z

328

A Vortex Relocation Scheme for Tropical Cyclone Initialization in Advanced Research WRF  

Science Conference Proceedings (OSTI)

This paper introduces a relocation scheme for tropical cyclone (TC) initialization in the Advanced Research Weather Research and Forecasting (ARW-WRF) model and demonstrates its application to 70 forecasts of Typhoons Sinlaku (2008), Jangmi (2008)...

Ling-Feng Hsiao; Chi-Sann Liou; Tien-Chiang Yeh; Yong-Run Guo; Der-Song Chen; Kang-Ning Huang; Chuen-Teyr Terng; Jen-Her Chen

2010-08-01T23:59:59.000Z

329

On Mass Conservation in High-Order High-Resolution Rigorous Remapping Schemes on the Sphere  

Science Conference Proceedings (OSTI)

It is the purpose of this short article to analyze mass conservation in high-order rigorous remapping schemes, which contrary to flux-based methods, relies on elaborate integral constraints over overlap areas and reconstruction functions. For ...

Christoph Erath; Peter H. Lauritzen; Henry M. Tufo

2013-06-01T23:59:59.000Z

330

The Performance of a Semi-Lagrangian Transport Scheme for the AdvectionCondensation Problem  

Science Conference Proceedings (OSTI)

A series of numerical experiments are carried out solving a coupled set of equations for advection and condensation with a semi-Lagrangian (SL) transport scheme. Canonical validation tests in one dimension show that SL suffers less numerical ...

Pierre Pellerin; Ren Laprise; Isztar Zawadzki

1995-11-01T23:59:59.000Z

331

Impact of Two Microphysical Schemes upon Gas Scavenging and Deposition in a Mesoscale Meteorological Model  

Science Conference Proceedings (OSTI)

Two widely used microphysical schemes are compared to evaluate their possible impact on wet deposition mechanisms. They are based upon different spectral distributions for raindrops (Marshall-Palmer and lognormal distributions) and use different ...

Nadine Chaumerliac; Evelyne Richard; Robert Rosset; Everett C. Nickerson

1991-01-01T23:59:59.000Z

332

An Upwind-Biased Transport Scheme Using a Quadratic Reconstruction on Spherical Icosahedral Grids  

Science Conference Proceedings (OSTI)

Several transport schemes developed for spherical icosahedral grids are based on the piecewise linear approximation. The simplest one among them uses an algorithm where the tracer distribution in the upwind side of a cell face is reconstructed ...

Hiroaki Miura; William C. Skamarock

2013-02-01T23:59:59.000Z

333

Application of the Bratseth Scheme for the Analysis Of GALF, Data Using a Mesoscale Model  

Science Conference Proceedings (OSTI)

The successive correction scheme of Bratseth, which converges to optimum interpolation, is applied for the numerical analysis of data collected during the Genesis of Atlantic Lows Experiment. A first guess for the analysis is provided by a 12-h ...

Keith D. Sashegyi; Dewey E. Harms; Rangarao V. Madala; Sethu Raman

1993-08-01T23:59:59.000Z

334

Resilience of Hybrid Ensemble/3DVAR Analysis Schemes to Model Error and Ensemble Covariance Error  

Science Conference Proceedings (OSTI)

Previous idealized numerical experiments have shown that a straightforward augmentation of an isotropic error correlation matrix with an ensemble-based error correlation matrix yields an improved data assimilation scheme under certain conditions. ...

Brian J. Etherton; Craig H. Bishop

2004-05-01T23:59:59.000Z

335

Simple Uncertainty Frameworks for Selecting Weighting Schemes and Interpreting Multimodel Ensemble Climate Change Experiments  

Science Conference Proceedings (OSTI)

Future climate change projections are often derived from ensembles of simulations from multiple global circulation models using heuristic weighting schemes. This study provides a more rigorous justification for this by introducing a nested family ...

Philip G. Sansom; David B. Stephenson; Christopher A. T. Ferro; Giuseppe Zappa; Len Shaffrey

2013-06-01T23:59:59.000Z

336

The Importance of Understanding Mesoscale Model Parameterization Schemes for Weather Forecasting  

Science Conference Proceedings (OSTI)

A severe weather outbreak that occurred on 2123 November 1992 in the southern United States is used to illustrate how an understanding of model parameterization schemes can help in the evaluation and utilization of mesoscale model output. ...

John V. Cortinas Jr.; David J. Stensrud

1995-12-01T23:59:59.000Z

337

On a Simple, Parameter-Free Partition between Moistening and Precipitation in the Kuo Scheme  

Science Conference Proceedings (OSTI)

This note presents a reformulation of the thermodynamic equations of the Kuo scheme in which the partition between moistening and precipitation is determined locally through use of the wet-bulb characteristics.

Jean-Francois Geleyn

1985-03-01T23:59:59.000Z

338

An Improved Statistical Scheme for the Prediction of Tropical Cyclones Making Landfall in South China  

Science Conference Proceedings (OSTI)

This study describes an improved statistical scheme for predicting the annual number of tropical cyclones (TCs) making landfall along the coast of south China using data from 1965 to 2005. Based on the factors affecting TC behavior inside the ...

Andy Zung-Ching Goh; Johnny C. L. Chan

2010-04-01T23:59:59.000Z

339

Efficient schemes for anonymous yet authorized and bounded use of cloud resources  

Science Conference Proceedings (OSTI)

In this paper we introduce anonymous yet authorized and bounded cloud resource schemes. Contrary to many other approaches to security and privacy in the cloud, we aim at hiding behavioral information, i.e. consumption patterns, of users consuming their ...

Daniel Slamanig

2011-08-01T23:59:59.000Z

340

A New Second-Order Turbulence Closure Scheme for the Planetary Boundary Layer  

Science Conference Proceedings (OSTI)

A new turbulence formulation for the planetary boundary layer (PBL) is presented and compared with large-eddy simulations (LES) for the dry PBL. The new scheme contains a prognostic equation for the turbulent kinetic energy. Other second-order ...

K. Abdella; N. McFarlane

1997-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Conservative Explicit Unrestricted-Time-Step Multidimensional Constancy-Preserving Advection Schemes  

Science Conference Proceedings (OSTI)

The multidimensional advection schemes described in this study are based on a strictly conservative flux-based control-volume formulation. They use an explicit forward-in-time update over a single time step, but there are no stability ...

B. P. Leonard; A. P. Lock; M. K. MacVean

1996-11-01T23:59:59.000Z

342

Speeding Up the Computation of WRF Double Moment 6-Class Microphysics Scheme with GPU  

Science Conference Proceedings (OSTI)

Weather Research and Forecasting (WRF) Double Moment 6-class (WDM6) microphysics scheme implements a double moment bulk microphysical parameterization of clouds and precipitation and is applicable in mesoscale and general circulation models. WDM6 ...

J. Mielikainen; B. Huang; H.-L. A. Huang; M. D. Goldberg; A. Mehta

343

The EUs Emissions Trading Scheme: A Proto-Type Global System?  

E-Print Network (OSTI)

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 ...

Ellerman, A. Denny

2008-01-01T23:59:59.000Z

344

The EUs Emissions Trading Scheme: A Prototype Global System?  

E-Print Network (OSTI)

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 ...

Ellerman, A. Denny

345

Stability of a Two-Time-Level Semi-Implicit Integration Scheme for Gravity Wave Motion  

Science Conference Proceedings (OSTI)

A study is made of the computational stability of semi-implicit treatments of gravity wave motion suitable for use with two-time-level advection schemes. The analysis is for horizontally uniform reference values of temperature and surface ...

A. J. Simmons; C. Temperton

1997-04-01T23:59:59.000Z

346

Experiments with a Three-Dimensional Statistical Objective Analysis Scheme Using FGGE Data  

Science Conference Proceedings (OSTI)

A three-dimensional (3D), multivariate, statistical objective analysis scheme (referred to as optimum interpolation or OI) has been developed for use in numerical weather prediction studies with the FGGE data. Some novel aspects of the present ...

Wayman E. Baker; Stephen C. Bloom; John S. Woollen; Mark S. Nestler; Eugenia Brin; Thomas W. Schlatter; Grant W. Branstator

1987-01-01T23:59:59.000Z

347

A Conservative Mesh-Free Scheme and Generalized Framework for Conservation Laws  

E-Print Network (OSTI)

We present a novel mesh-free scheme for solving partial differential equations. We first derive a conservative and stable formulation of mesh-free first derivatives. We then show that this formulation is a special case of ...

Chiu, Edmond Kwan-Yu

348

Energy Conserving and Potential-Enstrophy Dissipating Schemes for the Shallow Water Equations  

Science Conference Proceedings (OSTI)

To incorporate potential enstrophy dissipation into discrete shallow water equations with no or arbitrarily small energy dissipation, a family of finite-difference schemes have been derived with which potential enstrophy is guaranteed to decrease ...

Akio Arakawa; Yueh-Jiuan G. Hsu

1990-10-01T23:59:59.000Z

349

A Fully Conserved Minimal Adjustment Scheme with (T, S) Coherency for Stabilization of Hydrographic Profiles  

Science Conference Proceedings (OSTI)

A new, fully conserved minimal adjustment scheme with temperature and salinity (T, S) coherency is presented for eliminating false static instability generated from analyzing and assimilating stable ocean (T, S) profiles data, that is, from ...

Xidong Wang; Peter C. Chu; Guijun Han; Wei Li; Xuefeng Zhang; Dong Li

2012-12-01T23:59:59.000Z

350

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

E-Print Network (OSTI)

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 ...

Li, Depeng

351

Practical scheme for non-postselection entanglement concentration using linear optical elements  

E-Print Network (OSTI)

We report a practical non-postselection entanglement concentration scheme in which a maximally entangled Bell-state photon pair is produced from two pairs of partially (or non-maximally) entangled photons. Since this scheme is built only upon linear optical elements and does not require photon-number resolving detectors, it has immediate applications in experimental implementations of various quantum information protocols which require two-photon Bell-states.

Myung-Joong Hwang; Yoon-Ho Kim

2007-08-03T23:59:59.000Z

352

An Asymptotic-Preserving all-speed scheme for the Euler and Navier-Stokes equations  

Science Conference Proceedings (OSTI)

We present an Asymptotic-Preserving 'all-speed' scheme for the simulation of compressible flows valid at all Mach-numbers ranging from very small to order unity. The scheme is based on a semi-implicit discretization which treats the acoustic part implicitly ... Keywords: All-speed, Asymptotic-Preserving, Compressible flows, Euler equations, Incompressible flows, Low Mach number limit, Navier-Stokes equations

Floraine Cordier; Pierre Degond; Anela Kumbaro

2012-07-01T23:59:59.000Z

353

EPSB (Electronic Partially Shared Buffering): A Buffering Scheme for Asynchronous and Variable Length Optical Routing for the Edge Optical Packet Switch  

Science Conference Proceedings (OSTI)

We propose a new buffering scheme for wavelength division multiplexing (WDM) packet switching: the Electronic Partially Shared Buffering (EPSB) scheme. This buffering scheme incorporates separate buffers (i.e., electronic buffers) for all the outputs ...

Huhnkuk Lim; Chang-Soo Park

2002-01-01T23:59:59.000Z

354

Precise evaluation of thermal response functions by optimized density matrix renormalization group schemes  

E-Print Network (OSTI)

This paper provides a study and discussion of earlier as well as novel more efficient schemes for the precise evaluation of finite-temperature response functions of strongly correlated quantum systems in the framework of the time-dependent density matrix renormalization group (tDMRG). The computational costs and bond dimensions as functions of time and temperature are examined for the example of the spin-1/2 XXZ Heisenberg chain in the critical XY phase and the gapped N\\'eel phase. The matrix product state purifications occurring in the algorithms are in one-to-one relation with corresponding matrix product operators. This notational simplification elucidates implications of quasi-locality on the computational costs. Based on the observation that there is considerable freedom in designing efficient tDMRG schemes for the calculation of dynamical correlators at finite temperatures, a new class of optimizable schemes, as recently suggested in arXiv:1212.3570, is explained and analyzed numerically. A specific novel near-optimal scheme that requires no additional optimization reaches maximum times that are typically increased by a factor of two, when compared against earlier approaches. These increased reachable times make many more physical applications accessible. For each of the described tDMRG schemes, one can devise a corresponding transfer matrix renormalization group (TMRG) variant.

Thomas Barthel

2013-01-10T23:59:59.000Z

355

Evaluation of a Modified Scheme for Shallow Convection: Implementation of CuP and Case Studies  

Science Conference Proceedings (OSTI)

A new treatment for shallow clouds has been introduced into the Weather Research and Forecasting (WRF) model. The new scheme, called the cumulus potential (CuP) scheme, replaces the ad-hoc trigger function used in the Kain-Fritsch cumulus parameterization with a trigger function related to the distribution of temperature and humidity in the convective boundary layer via probability density functions (PDFs). An additional modification to the default version of WRF is the computation of a cumulus cloud fraction based on the time scales relevant for shallow cumuli. Results from three case studies over the U.S. Department of Energys Atmospheric Radiation Measurement (ARM) site in north central Oklahoma are presented. These days were selected because of the presence of shallow cumuli over the ARM site. The modified version of WRF does a much better job predicting the cloud fraction and the downwelling shortwave irradiance thancontrol simulations utilizing the default Kain-Fritsch scheme. The modified scheme includes a number of additional free parameters, including the number and size of bins used to define the PDF, the minimum frequency of a bin within the PDF before that bin is considered for shallow clouds to form, and the critical cumulative frequency of bins required to trigger deep convection. A series of tests were undertaken to evaluate the sensitivity of the simulations to these parameters. Overall, the scheme was found to be relatively insensitive to each of the parameters.

Berg, Larry K.; Gustafson, William I.; Kassianov, Evgueni I.; Deng, Liping

2013-01-01T23:59:59.000Z

356

A New Scheme for the Promotion of Renewable Energies in Developing  

Open Energy Info (EERE)

A New Scheme for the Promotion of Renewable Energies in Developing A New Scheme for the Promotion of Renewable Energies in Developing Countries: The Renewable Energy Regulated Purchase Tariff Jump to: navigation, search Tool Summary LAUNCH TOOL Name: A New Scheme for the Promotion of Renewable Energies in Developing Countries: The Renewable Energy Regulated Purchase Tariff Agency/Company /Organization: JRC European Commission Sector: Energy Focus Area: Renewable Energy Phase: Create a Vision Topics: - Energy Access, Finance Resource Type: Publications User Interface: Website Website: www.energy.eu/publications/LDNA23284ENC_002.pdf Cost: Free Language: English This report sets out the main findings of the discussions carried out by the Developing Countries Group of the European Photovoltaic (PV) Technology Platform. In particular, the findings of identifying and defining an

357

A kinetic scheme for unsteady pressurised flows in closed water pipes  

E-Print Network (OSTI)

he aim of this paper is to present a kinetic numerical scheme for the computations of transient pressurised flows in closed water pipes. Firstly, we detail the mathematical model written as a conservative hyperbolic partial differentiel system of equations, and the we recall how to obtain the corresponding kinetic formulation. Then we build the kinetic scheme ensuring an upwinding of the source term due to the topography performed in a close manner described by Perthame et al. using an energetic balance at microscopic level for the Shallow Water equations. The validation is lastly performed in the case of a water hammer in a uniform pipe: we compare the numerical results provided by an industrial code used at EDF-CIH (France), which solves the Allievi equation (the commonly used equation for pressurised flows in pipes) by the method of characteristics, with those of the kinetic scheme. It appears that they are in a very good agreement.

Bourdarias, Christian; Gerbi, Stphane

2008-01-01T23:59:59.000Z

358

Coupled-cluster method: A lattice-path-based subsystem approximation scheme for quantum lattice models  

Science Conference Proceedings (OSTI)

An approximation hierarchy, called the lattice-path-based subsystem (LPSUBm) approximation scheme, is described for the coupled-cluster method (CCM). It is applicable to systems defined on a regular spatial lattice. We then apply it to two well-studied prototypical (spin-(1/2) Heisenberg antiferromagnetic) spin-lattice models, namely, the XXZ and the XY models on the square lattice in two dimensions. Results are obtained in each case for the ground-state energy, the ground-state sublattice magnetization, and the quantum critical point. They are all in good agreement with those from such alternative methods as spin-wave theory, series expansions, quantum Monte Carlo methods, and the CCM using the alternative lattice-animal-based subsystem (LSUBm) and the distance-based subsystem (DSUBm) schemes. Each of the three CCM schemes (LSUBm, DSUBm, and LPSUBm) for use with systems defined on a regular spatial lattice is shown to have its own advantages in particular applications.

Bishop, R. F.; Li, P. H. Y. [School of Physics and Astronomy, Schuster Building, University of Manchester, Manchester M13 9PL (United Kingdom)

2011-04-15T23:59:59.000Z

359

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

E-Print Network (OSTI)

This paper presents a control scheme which utilizes the enhanced instantaneous cooling load measurements to improve the reliability of chiller sequencing control. The enhanced measurement is obtained by merging two different measurements of building cooling load using data fusion technique. One is the direct cooling load measurement, which is obtained directly using the differential water temperature and water flow rate measurements. The other is the indirect cooling load measurement, which estimates 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.

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

2008-10-01T23:59:59.000Z

360

Design of a real time switching control scheme for capacity compensation of distribution feeders  

SciTech Connect

A new control scheme for multilevel control of capacitors on radial distribution feeders is developed for implementation by an on-line, substation-based computer. The control objectives are the minimization of radial feeder losses of energy and power. Control is exercised through multilevel switching of existing shunt-connected static capacitors. It is shown how time-varying load data on existing feeders obtained through measurements at the substation can be taken into account. When reactive-load duration curves can be constructed for existing feeders, it is also shown how to optimally design the control scheme to include fixed and non-simultaneously switched capacitors.

Grainger, J.J.; El-Kib, A.A.; Lee, S.H.

1982-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

An Adaptive Entanglement Distillation Scheme Using Quantum Low Density Parity Check Codes  

E-Print Network (OSTI)

Quantum low density parity check (QLDPC) codes are useful primitives for quantum information processing because they can be encoded and decoded efficiently. Besides, the error correcting capability of a few QLDPC codes exceeds the quantum Gilbert-Varshamov bound. Here, we report a numerical performance analysis of an adaptive entanglement distillation scheme using QLDPC codes. In particular, we find that the expected yield of our adaptive distillation scheme to combat depolarization errors exceed that of Leung and Shor whenever the error probability is less than about 0.07 or greater than about 0.28. This finding illustrates the effectiveness of using QLDPC codes in entanglement distillation.

K. H. Ho; H. F. Chau

2008-07-14T23:59:59.000Z

362

K-theoretic Chow groups of derived categories of schemes-on a question by Green-Griffiths.  

E-Print Network (OSTI)

Based on Balmer's tensor triangular Chow group, we propose K-theoretic Chow groups of derived categories of noetherian schemes and their Milnor variants for regular schemes and their thickenings. We discuss functoriality and show that our Chow groups agree with the classical ones for regular schemes. Moreover, we also define tangent spaces to our Chow groups as usually and identify them with cohomology groups of differentials. As an application, we extend Bloch-Quillen identification and soule's variant from regular schemes to their thickenings. This gives a positive answer to a question by Green-Griffiths.

Sen Yang

363

Single and double frame coding of speech LPC parameters using a lattice-based quantization scheme  

Science Conference Proceedings (OSTI)

A lattice-based scheme for the single-frame and the double-frame quantization of the speech line spectral frequency parameters is proposed. The lattice structure provides a low-complexity vector quantization framework, which is implemented using a trellis ... Keywords: CELP, LPC, LSF, interframe coding, intraframe coding, lattice-based quantization, quantization, speech coding

F. Lahouti; A. R. Fazel; A. H. Safavi-Naeini; A. K. Khandani

2006-09-01T23:59:59.000Z

364

An enhanced load transfer scheme for power distribution systems connected with distributed generation sources  

Science Conference Proceedings (OSTI)

This paper presents an enhanced load transfer scheme for power distribution systems connected with distributed generation sources. Load transfer is an important approach to improve the reliability of power distribution systems. The proposed load transfer ... Keywords: distributed generation source, distribution feeder, distribution system, interconnection, load transfer

Wen-Chih Yang; Wei-Tzer Huang

2011-04-01T23:59:59.000Z

365

Dissipation and Cascades to Small Scales in Numerical Models Using a Shape-Preserving Advection Scheme  

Science Conference Proceedings (OSTI)

A nondivergent barotropic mode1 and a shallow-water model are presented that exploit a high-order shape-preserving scheme for the advection of vorticity or potential vorticity as well as tracers. The dissipation associated with the advection ...

John Thuburn

1995-06-01T23:59:59.000Z

366

Performance of an Eddy DiffusivityMass Flux Scheme for Shallow Cumulus Boundary Layers  

Science Conference Proceedings (OSTI)

Comparisons between single-column (SCM) simulations with the total energymass flux boundary layer scheme (TEMF) and large-eddy simulations (LES) are shown for four cases from the Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS) ...

Wayne M. Angevine; Hongli Jiang; Thorsten Mauritsen

2010-07-01T23:59:59.000Z

367

A high-performance reversible data-hiding scheme for LZW codes  

Science Conference Proceedings (OSTI)

Hiding a message in compression codes can reduce transmission costs and simultaneously make the transmission more secure. In this paper, we propose a high-performance, data-hiding Lempel-Ziv-Welch (HPDH-LZW) scheme, which reversibly embeds data in LZW ... Keywords: Information-hiding, LZW, Steganography

Zhi-Hui Wang, Hai-Rui Yang, Ting-Fang Cheng, Chin-Chen Chang

2013-11-01T23:59:59.000Z

368

A Distributed Virtual Backbone Development Scheme for Ad-Hoc Wireless Networks  

Science Conference Proceedings (OSTI)

The virtual backbone is an approach for solving routing problems in ad-hoc wireless networks. The virtual backbone approach features low latency, moderate routing overhead and is a hybrid scheme that uses the table-driven and on-demand routing ... Keywords: Steiner tree, ad-hoc networks, clustering, routing, virtual backbone

Jyh-Horng Lin; Chyi-Ren Dow; Shiow-Fen Hwang

2003-12-01T23:59:59.000Z

369

VTG schemes for using back propagation for multivariate time series prediction  

Science Conference Proceedings (OSTI)

This research proposes the three schemes of estimating and adding mid-terms to multivariate time series. In this research, the back propagation is adopted as the approach to multivariate time series prediction. It is traditionally designed for the task ... Keywords: Multivariate time series prediction, Neural networks, Virtual terms

Taeho Jo

2013-05-01T23:59:59.000Z

370

Introducing an Irrigation Scheme to a Regional Climate Model: A Case Study over West Africa  

Science Conference Proceedings (OSTI)

This article presents a new irrigation scheme and biome to the dynamic vegetation model, Integrated Biosphere Simulator (IBIS), coupled to Regional ClimateModel version 3 (RegCM3-IBIS). The new land cover allows for only the plant functional type, ...

Marc P. Marcella; Elfatih A. B. Eltahir

371

A Mixed Scheme for Subgrid-Scale Fluxes in Cloud-Resolving Models  

Science Conference Proceedings (OSTI)

A large-domain large-eddy simulation of a tropical deep convection system is used as a benchmark to derive and test a mixed subgrid-scale (SGS) scheme for scalar and momentum fluxes in cloud-resolving models (CRMs). The benchmark simulation ...

C.-H. Moeng; P. P. Sullivan; M. F. Khairoutdinov; D. A. Randall

2010-11-01T23:59:59.000Z

372

The Influence of a CO2 Pricing Scheme on Distributed Energy Resources in  

E-Print Network (OSTI)

pricing scheme or a feed-in tariff (FiT), and show their contributions to the California Air Resources Program, under Work for Others Contract No. 500-07-043, 500-99-013 and by the U.S. Department of Energy tariffs of major utilities, and expected performance data of available technologies in 2020, we find

373

An efficient clustering scheme for large and dense mobile ad hoc networks (MANETs)  

Science Conference Proceedings (OSTI)

Large and dense MANETs often face scalability problem and need to achieve performance guarantee with the help of a hierarchical structure, typically a cluster control structure. In this paper, an efficient clustering scheme (ECS) is proposed for large ... Keywords: Clustering, MANETs, Scalability, Stability

Jane Yang Yu; Peter Han Joo Chong

2006-12-01T23:59:59.000Z

374

Exploring parallelization for medium access schemes on many-core software defined radio architecture  

Science Conference Proceedings (OSTI)

As multi-standard devices and high speed communication standards are emerging, timeliness requirements and flexibility for both baseband modem and medium access schemes are becoming essential. Software Defined Radios (SDRs), in this context, aim at offering ... Keywords: mac, many-core, parallelization, sdr platform

Xi Zhang, Junaid Ansari, Manish Arya, Petri Mhnen

2013-08-01T23:59:59.000Z

375

KALwEN: a new practical and interoperable key management scheme for body sensor networks  

Science Conference Proceedings (OSTI)

Key management is the pillar of a security architecture. Body sensor networks (BSNs) pose several challengessome inherited from wireless sensor networks (WSNs), some unique to themselvesthat require a new key management scheme to be tailor-made. ... Keywords: body area networks, body sensor networks, healthcare, key management, security

Yee Wei Law; Giorgi Moniava; Zheng Gong; Pieter Hartel; Marimuthu Palaniswami

2011-11-01T23:59:59.000Z

376

Efficient and effective ultrasound image analysis scheme for thyroid nodule detection  

Science Conference Proceedings (OSTI)

Ultrasound imaging of thyroid gland provides the ability to acquire valuable information for medical diagnosis. This study presents a novel scheme for the analysis of longitudinal ultrasound images aiming at efficient and effective computer-aided detection ... Keywords: local binary patterns, thyroid boundary detection, thyroid nodules, ultrasound

Eystratios G. Keramidas

2007-08-01T23:59:59.000Z

377

A Coupled Soil-Vegetation Scheme: Description, Parameters, Validation, and, Sensitivity Studies  

Science Conference Proceedings (OSTI)

A coupled soil-vegetation scheme is presented. A one-layer canopy and a three-layer soil representation is used. The impact of canopy morphological properties on radiation and momentum transfer in the vegetation is modeled as simply as possible. ...

Ferenc cs

1994-02-01T23:59:59.000Z

378

A dynamic estimation scheme of specific growth rates of bacteria for an anaerobic wastewater treatment process  

E-Print Network (OSTI)

. The dynamics of this process are the ones of standard anaerobic digestion, and depend on the type of organic is devoted to the description of the model of the specific anaerobic digestion processA dynamic estimation scheme of specific growth rates of bacteria for an anaerobic wastewater

379

On the Equivalence of Semi-Lagrangian Schemes and Particle-in-Cell Finite Element Methods  

Science Conference Proceedings (OSTI)

It is shown that the semi-Lagrangian schemes with cubic spline interpolation are equivalent to a particle-in-cell finite element method. The method conserves mass, is unconditionally stable, and has a truncation error as high as fourth-order for ...

Rodolfo Bermejo

1990-04-01T23:59:59.000Z

380

An Adaptive Threshold Load Balancing Scheme for the End-to-End Reconfigurable System  

Science Conference Proceedings (OSTI)

In this paper, an adaptive threshold load balancing (ATLB) scheme is proposed for the joint load control (JOLDC) in the end-to-end reconfigurable system. The dynamic threshold based on heterogeneous load measurement is designed to adapt to varying load ... Keywords: Heterogeneous, Load balancing, Reconfigurability, Terminal selection, Vertical handover

Yongjing Zhang; Kui Zhang; Cheng Chi; Yang Ji; Zhiyong Feng; Ping Zhang

2008-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

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

E-Print Network (OSTI)

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

Thole, Karen A.

382

A matrix free implicit scheme for solution of resistive magneto-hydrodynamics equations on unstructured grids  

Science Conference Proceedings (OSTI)

The resistive magneto-hydrodynamics (MHD) governing equations represent eight conservation equations for the evolution of density, momentum, energy and induced magnetic fields in an electrically conducting fluid, typically a plasma. A matrix free implicit ... Keywords: Finite volume methods, Implicit schemes, Lower-Upper Symmetric Gauss Seidel, Magneto-hydrodynamics, Matrix-free, Unstructured grids

H. Sitaraman, L. L. Raja

2013-10-01T23:59:59.000Z

383

Extension of the Complete Flux Scheme to Systems of Conservation Laws  

Science Conference Proceedings (OSTI)

We present the extension of the complete flux scheme to advection-diffusion-reaction systems. For stationary problems, the flux approximation is derived from a local system boundary value problem for the entire system, including the source term vector. ... Keywords: Advection-diffusion-reaction systems, Finite volume method, Flux (vector), Green's matrix, Integral representation of the flux, Matrix functions, Numerical flux, Peclet matrix

J. H. Thije Boonkkamp; J. Dijk; L. Liu; K. S. Peerenboom

2012-12-01T23:59:59.000Z

384

A Locally One-Dimensional Semi-Implicit Scheme for Global Gridpoint Shallow-Water Models  

Science Conference Proceedings (OSTI)

A splitting method is presented for eliminating the need to directly solve for a two-dimensional Helmholtz-type difference equation in a semi-implicit scheme for a global gridpoint shallow-water model. In the proposed method, the model equations ...

Sajal K. Kar; Richard P. Turco; Carlos R. Mechoso; Akio Arakawa

1994-01-01T23:59:59.000Z

385

Pre-medical Studies Division of Biomedical and Life Sciences Degree Schemes  

E-Print Network (OSTI)

Pre-medical Studies A900 Division of Biomedical and Life Sciences Degree Schemes Our Pre-medical Studies course provides an opportunity for entry into medical education for individuals with non to enter year 1 of the Liverpool University MBChB medical degree studying at Lancaster or Liverpool

Meju, Max

386

Horizontal Advection Schemes of a Staggered GridAn Enstrophy and Energy-Conserving Model  

Science Conference Proceedings (OSTI)

For use in a model on the semi-staggered E (in the Arakawa notation) grid, a number of conserving schemes for the horizontal advection are developed and analyzed. For the rotation terms of the momentum advection, the second-order enstrophy and ...

Fedor Mesinger

1981-03-01T23:59:59.000Z

387

A Two-Dimensional MagnetoHydrodynamics Scheme for General Unstructured Grids  

E-Print Network (OSTI)

We report a new finite-difference scheme for two-dimensional magnetohydrodynamics (MHD) simulations, with and without rotation, in unstructured grids with quadrilateral cells. The new scheme is implemented within the code VULCAN/2D, which already includes radiation-hydrodynamics in various approximations and can be used with arbitrarily moving meshes (ALE). The MHD scheme, which consists of cell-centered magnetic field variables, preserves the nodal finite difference representation of $div(\\bB)$ by construction, and therefore any initially divergence-free field remains divergence-free through the simulation. In this paper, we describe the new scheme in detail and present comparisons of VULCAN/2D results with those of the code ZEUS/2D for several one-dimensional and two-dimensional test problems. The code now enables two-dimensional simulations of the collapse and explosion of the rotating, magnetic cores of massive stars. Moreover, it can be used to simulate the very wide variety of astrophysical problems for which multi-D radiation-magnetohydrodynamics (RMHD) is relevant.

Eli Livne; Luc Dessart; Adam Burrows; Casey A. Meakin

2007-02-18T23:59:59.000Z

388

DRA: a new buffer management scheme for wireless atm networks using aggregative large deviation principle  

Science Conference Proceedings (OSTI)

In this paper, we present a buffer management scheme called Dynamic Resource Allocation (DRA) that provides TCP traffic control guarantees to VCs carrying multiple dynamic discard thresholds (Multiple Dynamic Thresholds-MDT) over a wireless CDMA ATM ... Keywords: Buffer management, CDMA, Dynamic resource management, Large deviation principle, QoS, Wireless ATM

M. S. Obaidat; C. Ben Ahmed; N. Boudriga

2003-05-01T23:59:59.000Z

389

Third-Order Finite-Difference Schemes on Icosahedral-Type Grids on the Sphere  

Science Conference Proceedings (OSTI)

A practical method is proposed to achieve high-order finite-difference schemes on grids that are quasi-homogeneous on the sphere. A family of grids is used that are characterized by the parameter NP, which can take on values of 3, 4, and 5, etc. ...

J. Steppeler; P. Rpodas; B. Jonkheid; S. Thomas

2008-07-01T23:59:59.000Z

390

DNA-inspired Scheme for Building the Energy Profile of HPC Systems  

E-Print Network (OSTI)

, published in "E2DC - 1st International Workshop on Energy-Efficient Data Centres - 2011 (2012)" #12;savingDNA-inspired Scheme for Building the Energy Profile of HPC Systems Ghislain Landry Tsafack Chetsa1), University of Toulouse 118 Route de Narbonne, F-31062 Toulouse CEDEX 9, France Abstract. Energy usage

391

The System Impact of Air-Conditioner Under-voltage Protection Schemes  

Science Conference Proceedings (OSTI)

This paper presents simulation results of evaluating an under-voltage protection scheme designed to take stalled air-conditioner (a/c) units offline such that the slow voltage recovery phenomena can be solved on areas heavily loaded with a/c motors during summer peak periods. A three feeder test-bed has been first used to quantify the effectiveness of the protection scheme and the sensitivity of the under-voltage relay settings. Then two real system events of the Western US power grid have been studied to evaluate the area impact of the protection scheme proposed by Southern California Edison. The study demonstrates that by taking all or most of the stalled a/c unit offline, the feeder voltage will recover in a few seconds, much quicker than the tens of seconds that the standard thermal relays imbedded in the motors need to trip the units. The drawback of the control scheme is that after the voltage recover, it settled at a higher voltage than before the faults because a large chuck of load has been shed.

Lu, Ning; Yang, Bo; Huang, Zhenyu; Bravo, Richard

2009-03-31T23:59:59.000Z

392

An H infinity (H?) design scheme for an air blown gasification cycle unit using matlab  

Science Conference Proceedings (OSTI)

The purpose of this paper is to use the H? design technique in order to produce an efficient controller for a real application, which concerns the design of a control scheme for an air blown gasification cycle unit plant (gasifier) for the production ... Keywords: H?, close loop, gasifier, matlab, multivariate analysis, open loop, robustness, stability

Stylianos SP. Pappas

2006-12-01T23:59:59.000Z

393

A Signal-processing Scheme for Passive Acoustical Mapping of Breaking Surface Waves  

Science Conference Proceedings (OSTI)

An acoustical system is described with emphasis on its signal-processing scheme. The system consists of a small broadband hydrophone array of span 8.5 m and 5-kHz bandwidth, which is able to track individual breaking surface waves by passive ...

Li Ding; David M. Farmer

1992-08-01T23:59:59.000Z

394

A Resource Intensive Traffic-Aware Scheme for Cluster-based Energy Conservation in Wireless Devices  

Science Conference Proceedings (OSTI)

Wireless traffic that is destined for a certain device in a network, can be exploited in order to minimize the availability and delay trade-offs, and mitigate the Energy consumption. The Energy Conservation (EC) mechanism can be node-centric by considering ... Keywords: Energy Conservation, Traffic-aware scheme, End-to-end communication, Capacity consideraiton for Energy Harvesting

Marios C. Charalambous; Constandinos X. Mavromoustakis; Muneer Bani Yassein

2012-06-01T23:59:59.000Z

395

Thermodynamic Adjustment Parameters in the BettsMiller Scheme of Convection  

Science Conference Proceedings (OSTI)

The sensitivity of the prediction of a monsoon depression to the adjustment parameters in a BettsMiller scheme of deep convection is examined and an optimum parameter set is identified for the monsoon depression. For this purpose, a number of ...

S. S. Vaidya; S. S. Singh

1997-12-01T23:59:59.000Z

396

A Process-Oriented Small Lake Scheme for Coupled Climate Modeling Applications  

Science Conference Proceedings (OSTI)

A one-dimensional dynamic lake model is presented as a candidate for simulating small unresolved lakes within the land surface scheme of a regional or global climate model. This model is based largely on well-established process algorithms with ...

Murray D. MacKay

2012-12-01T23:59:59.000Z

397

An evaluation scheme to identify superior cultivars of winter and spring canola  

E-Print Network (OSTI)

An evaluation scheme to identify superior cultivars of winter and spring canola that are suitable for production in the Pacific Northwest. #12;2001 PACIFIC NORTHWEST WINTER CANOLA TRIAL RESULTS Jim B. Davis1 University ABSTRACT A winter rapeseed and canola variety trial with 20 Brassica napus cultivars or advanced

Brown, Jack

398

An evaluation scheme to identify superior cultivars of winter and spring canola  

E-Print Network (OSTI)

An evaluation scheme to identify superior cultivars of winter and spring canola that are suitable-mail: jbrown@uidaho.edu #12;2001-2002 PACIFIC NORTHWEST WINTER CANOLA TRIAL RESULTS Jim B. Davis1 , Jack Brown1 A winter rapeseed and canola variety trial with 21 Brassica napus cultivars or advanced breeding lines

Brown, Jack

399

A collocated method for the incompressible Navier-Stokes equations inspired by the Box scheme  

Science Conference Proceedings (OSTI)

We present a new finite-difference numerical method to solve the incompressible Navier-Stokes equations using a collocated discretization in space on a logically Cartesian grid. The method shares some common aspects with, and it was inspired by, the ... Keywords: Box scheme, Centered finite differences, Discrete mass conservation, Incompressible flow

R. Ranjan; C. Pantano

2013-01-01T23:59:59.000Z

400

Global simulations of ice nucleation and ice supersaturation with an improved cloud scheme in the Community  

E-Print Network (OSTI)

and supersaturation in CAM. The new model is able to reproduce field observations of ice mass and mixed phase cloudGlobal simulations of ice nucleation and ice supersaturation with an improved cloud scheme; accepted 3 June 2010; published 28 September 2010. [1] A processbased treatment of ice supersaturation

Gettelman, Andrew

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

An Improved Land Surface Parameterization Scheme in the ECMWF Model and Its Validation  

Science Conference Proceedings (OSTI)

A new version of the ECMWF land surface parameterization scheme is described. It has four prognostic layers in the soil for temperature and soil moisture, with a free drainage and a zero heat flux condition at the bottom as a boundary condition. ...

Pedro Viterbo; Anton C. M. Beljaars

1995-11-01T23:59:59.000Z

402

A performance comparison of mobility anchor point selection schemes in Hierarchical Mobile IPv6 networks  

Science Conference Proceedings (OSTI)

Hierarchical Mobile IPv6 (HMIPv6) introduces a mobility anchor point (MAP) that localizes the signaling traffic and hence reduces the handoff latency. In addition to processing binding update messages from mobile nodes (MNs) on behalf of MNs' home agents ... Keywords: Analytical modeling, Hierarchical Mobile IPv6, Load balancing, MAP selection scheme, Mobility anchor point (MAP)

Sangheon Pack; Taekyoung Kwon; Yanghee Choi

2007-04-01T23:59:59.000Z

403

Evaluation of Planetary Boundary Layer Scheme Sensitivities for the Purpose of Parameter Estimation  

E-Print Network (OSTI)

for the parameters within the Asymmetrical Convective Model, version 2 (ACM2) planetary boundary layer (PBL) scheme of the simulations to these 10 particular ACM2 parameters within their plausible physical bounds. The most Appropriate treatment of vertical mixing is an essen- tial component of meteorological and air quality models

404

Advantages of Spatial Averaging in Semi-implicit Semi-Lagrangian Schemes  

Science Conference Proceedings (OSTI)

A modified semi-Lagrangian scheme is proposed in the context of semi-implicit forecast models to reduce the important distortion of topographically forced waves that is produced when the CourantFriedrichsLewy (CFL) number is greater than 1. The ...

Monique Tanguay; Evhen Yakimiw; Harold Ritchie; Andr Robert

1992-01-01T23:59:59.000Z

405

ADER-WENO Finite Volume Schemes with Space-Time Adaptive Mesh Refinement  

E-Print Network (OSTI)

We present the first high order one-step ADER-WENO finite volume scheme with Adaptive Mesh Refinement (AMR) in multiple space dimensions. High order spatial accuracy is obtained through a WENO reconstruction, while a high order one-step time discretization is achieved using a local space-time discontinuous Galerkin predictor method. Due to the one-step nature of the underlying scheme, the resulting algorithm is particularly well suited for an AMR strategy on space-time adaptive meshes, i.e.with time-accurate local time stepping. The AMR property has been implemented 'cell-by-cell', with a standard tree-type algorithm, while the scheme has been parallelized via the Message Passing Interface (MPI) paradigm. The new scheme has been tested over a wide range of examples for nonlinear systems of hyperbolic conservation laws, including the classical Euler equations of compressible gas dynamics and the equations of magnetohydrodynamics (MHD). High order in space and time have been confirmed via a numerical convergenc...

Dumbser, Michael; Hidalgo, Arturo; Balsara, Dinshaw S

2012-01-01T23:59:59.000Z

406

A Sparse Grid SpaceTime Discretization Scheme for Parabolic Problems  

E-Print Network (OSTI)

A Sparse Grid Space­Time Discretization Scheme for Parabolic Problems Michael Griebel, Daniel Oeltz Abstract In this paper we consider the discretization in space and time of parabolic di#erential equations. This holds in many applications due to the smoothing properties of the propagator of the parabolic PDE (heat

Bartels, Soeren

407

A Parallel Scheme of the Split-Step Fourier Transform Method for Solving Parabolic Wave Equation  

Science Conference Proceedings (OSTI)

The split-step Fourier transform method for solving the parabolic wave equation is briefly introduced in this paper. To achieve the acceleration of the calculation process, a parallel scheme based on matrix transpose is proposed. Due to some ingenious ... Keywords: Parabolic Wave Equation, Split-Step Fourier Transform Method, Parallel Computing

Liu Shuai; Li Zhi

2012-10-01T23:59:59.000Z

408

Trapdoor security in a searchable public-key encryption scheme with a designated tester  

Science Conference Proceedings (OSTI)

We study a secure searchable public-key encryption scheme with a designated tester (dPEKS). The contributions of this paper are threefold. First, we enhance the existing security model to incorporate the realistic abilities of dPEKS attackers. Second, ... Keywords: Data security, Designated tester, Keyword search on encrypted data

Hyun Sook Rhee; Jong Hwan Park; Willy Susilo; Dong Hoon Lee

2010-05-01T23:59:59.000Z

409

Application of a Medium-Range Global Hydrologic Probabilistic Forecast Scheme to the Ohio River Basin  

Science Conference Proceedings (OSTI)

A 10-day globally applicable flood prediction scheme was evaluated using the Ohio River basin as a test site for the period 200307. The Variable Infiltration Capacity (VIC) hydrology model was initialized with the European Centre for Medium-Range ...

Nathalie Voisin; Florian Pappenberger; Dennis P. Lettenmaier; Roberto Buizza; John C. Schaake

2011-08-01T23:59:59.000Z

410

An Efficient Horizontal Advection Scheme for the Modeling of Global Transport of Constituents  

Science Conference Proceedings (OSTI)

In this paper the authors consider a dimensional-splitting scheme for horizontal advection on a sphere with a uniform longitude-latitude grid. The 1D subprocesses that arise within the splitting are solved with an explicit finite-volume type ...

W. Hundsdorfer; E. J. Spee

1995-12-01T23:59:59.000Z

411

Time Step Sensitivity and Accelerated Spinup of an Ocean GCM with a Complex Mixing Scheme  

Science Conference Proceedings (OSTI)

The distorted physics (DP) technique of Bryan and Lewis is applied to an ocean GCM to allow longer time steps to be taken. The model includes a hybrid vertical mixing scheme for tracers, consisting of a KrausTurner mixed layer model and a ...

Richard A. Wood

1998-04-01T23:59:59.000Z

412

A Semi-Lagrangian and Semi-Implicit Two Time-Level Integration Scheme  

Science Conference Proceedings (OSTI)

A semi-Lagrangian and semi-implicit two time-level integration scheme has been constructed for integrating the primitive meteorological equations. It can be thought of as working in the following way. During the first half-time step the Coriolis ...

A. McDonald

1986-05-01T23:59:59.000Z

413

An Upwind-Biased Conservative Advection Scheme for Spherical HexagonalPentagonal Grids  

Science Conference Proceedings (OSTI)

A discrete form of the flux-divergence operator is developed to compute advection of tracers on spherical hexagonalpentagonal grids. An upwind-biased advection scheme based on a piecewise linear approximation for one-dimensional regular grids is ...

Hiroaki Miura

2007-12-01T23:59:59.000Z

414

Address-Bit Differential Power Analysis of Cryptographic Schemes OK-ECDH and OK-ECDSA  

Science Conference Proceedings (OSTI)

The differential power analysis (DPA) is a powerful attack against the implementation of cryptographic schemes on mobile devices. This paper proposes an alternative DPA using the addresses of registers of elliptic curve based cryptosystems (ECC) implemented ... Keywords: OK-ECDH, OK-ECDSA, address-bit DPA, differential power analysis (DPA), elliptic curve cryptosystems (ECC), scalar exponentiation

Kouichi Itoh; Tetsuya Izu; Masahiko Takenaka

2002-08-01T23:59:59.000Z

415

A fuzzy neural network based fault detection scheme for synchronous generator with internal fault  

Science Conference Proceedings (OSTI)

A fuzzy neural network (FNN) based inter-turn short circuit fault detection scheme for generator is proposed. The second harmonic magnitude of field current and the negative sequence components of voltages and currents are used as inputs for the FNN ...

Hongwei Fang; Changliang Xia

2009-08-01T23:59:59.000Z

416

Highly Accurate Schemes for PDE-Based Morphology with General Convex Structuring Elements  

Science Conference Proceedings (OSTI)

The two fundamental operations in morphological image processing are dilation and erosion. These processes are defined via structuring elements. It is of practical interest to consider a variety of structuring element shapes. The realisation of dilation/erosion ... Keywords: Dilation, Erosion, Finite difference method, Flux-corrected transport scheme, Mathematical morphology, Partial differential equation

Michael Breu?; Joachim Weickert

2011-04-01T23:59:59.000Z

417

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

Science Conference Proceedings (OSTI)

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.

HACHE, J.M.

1999-08-25T23:59:59.000Z

418

Efficient exact edit similarity query processing with the asymmetric signature scheme  

Science Conference Proceedings (OSTI)

Given a query string Q, an edit similarity search finds all strings in a database whose edit distance with Q is no more than a given threshold t. Most existing method answering edit similarity queries rely on a signature scheme to generate candidates ... Keywords: Q-gram, approximate pattern matching, edit distance, similarity join, similarity search

Jianbin Qin; Wei Wang; Yifei Lu; Chuan Xiao; Xuemin Lin

2011-06-01T23:59:59.000Z

419

A new dynamic guard channel reservation scheme for cellular wireless networks  

Science Conference Proceedings (OSTI)

In this paper, a new dynamic guard channel reservation scheme, based on conditional real-time channel availability, is proposed to achieve better handoff performance and higher utilisation of system resources (radio spectrum) in cellular ... Keywords: blocking, cellular wireless networks, dynamic guard channel, forced termination probability, guard channel reservation, handoff performance, radio spectrum

Raj Kumar Samanta; Gautam Sanyal; Partha Bhattacharjee

2010-09-01T23:59:59.000Z

420

A Novel Scheme for Encoding and Watermark Embedding in VLSI Physical Design for IP Protection  

Science Conference Proceedings (OSTI)

The emerging trend of design reuse in VLSI circuits poses the threat of theft and misappropriation of intellectual property (IP) of the design. Protection of design IP is a matter of prime concern today. Here we propose a scheme SECURE IP, which tackles ...

Debasri Saha; Parthasarathi Dasgupta; Susmita Sur-Kolay; Samar Sen-Sarma

2007-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Improvements of a Mixed-Phase Cloud Scheme Using Aircraft Observations  

Science Conference Proceedings (OSTI)

To improve the quality of forecasts of mixed-phase clouds in winter storms, some aspects of a cloud scheme are examined in detail. Modifications to the basic formalism and specification of selected parameters of the cloud model are studied, and ...

Andr Tremblay; Paul A. Vaillancourt; Stewart G. Cober; Anna Glazer; George A. Isaac

2003-04-01T23:59:59.000Z

422

A Consistent Time-Split Numerical Scheme Applied to the Nonhydrostatic Compressible Equations  

Science Conference Proceedings (OSTI)

The primary interest of the paper is to apply a two-time-level split explicit time scheme developed by one of the authors to the Lokal-Modell (LM) of the German Weather Service (DWD). This model belongs to the operational NWP system at DWD, which ...

Almut Gassmann; Hans-Joachim Herzog

2007-01-01T23:59:59.000Z

423

Adaptation of P.D. Thompson's Scheme to the Constraint of Potential vorticity Conservation  

Science Conference Proceedings (OSTI)

The dynamical adjustment scheme of P.D. Thompson (1969) has been adapted to the two-parameter baroclinic model which has potential vorticity as the constraint. In contrast to Thompson's approach, which used a differential-difference form of the ...

John M. Lewis

1982-11-01T23:59:59.000Z

424

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

E-Print Network (OSTI)

. Such satellites are therefore not only useful for weather forecasting, but also for the estimation of solarTHE USE OF MSG DATA WITHIN A NEW TYPE OF SOLAR IRRADIANCE CALCULATION SCHEME R. W. Mueller , H; 7-Instituto Tecnologico de Canarias; 8-Fraunhofer Institute for Solar Energy Systems; 9-German

Heinemann, Detlev

425

Simulation of Transients in Natural Gas Pipelines: Using Hybrid TVD/LW/MOC Schemes  

Science Conference Proceedings (OSTI)

the mathematical model describing transients in natural gas pipelines constitutes a non-homogeneous system of non-linear hyperbolic conservation laws. The energy equation is coupled to simulate the transient of temperature and acoustic wave speed in ... Keywords: transient flow, hyperbolic conservation, hybrid scheme, wave propagation, test

Xueyuan Long; Jiang Fu

2010-12-01T23:59:59.000Z

426

A robust numerical scheme for highly compressible magnetohydrodynamics: Nonlinear stability, implementation and tests  

E-Print Network (OSTI)

The ideal MHD equations are a central model in astrophysics, and their solution relies upon stable numerical schemes. We present an implementation of a new method, which possesses excellent stability properties. Numerical tests demonstrate that the theoretical stability properties are valid in practice with negligible compromises to accuracy. The result is a highly robust scheme with state-of-the-art efficiency. The scheme's robustness is due to entropy stability, positivity and properly discretised Powell terms. The implementation takes the form of a modification of the MHD module in the FLASH code, an adaptive mesh refinement code. We compare the new scheme with the standard FLASH implementation for MHD. Results show comparable accuracy to standard FLASH with the Roe solver, but highly improved efficiency and stability, particularly for high Mach number flows and low plasma beta. The tests include 1D shock tubes, 2D instabilities and highly supersonic, 3D turbulence. We consider turbulent flows with RMS sonic Mach numbers up to 10, typical of gas flows in the interstellar medium. We investigate both strong initial magnetic fields and magnetic field amplification by the turbulent dynamo from extremely high plasma beta. The energy spectra show a reasonable decrease in dissipation with grid refinement, and at a resolution of 512^3 grid cells we identify a narrow inertial range with the expected power-law scaling. The turbulent dynamo exhibits exponential growth of magnetic pressure, with the growth rate twice as high from solenoidal forcing than from compressive forcing. Two versions of the new scheme are presented, using relaxation-based 3-wave and 5-wave approximate Riemann solvers, respectively. The 5-wave solver is more accurate in some cases, and its computational cost is close to the 3-wave solver.

Knut Waagan; Christoph Federrath; Christian Klingenberg

2011-01-15T23:59:59.000Z

427

Gamma-ray decay schemes for $sup 93$Kr, $sup 93$Rb, and $sup 93$Sr  

SciTech Connect

A study of the gamma-ray de-excitation following the beta decays of $sup 93$Kr, $sup 93$Rb, and $sup 93$Sr using the TRISTAN on-line separator facility is reported. Gamma-ray singles and gamma-gamma coincidence measurements were made using Ge(Li) detectors. Of the 162 gamma rays observed in the decay of $sup 93$Sr, 143, representing more than 99 percent of the total gamma-ray intensity observed, were placed in a level scheme containing 36 levels. For the decay of $sup 93$Rb, 243 gamma rays were observed, of which 231 are placed in a level scheme consisting of 74 levels. This again represents a placement of over 99 percent of the total gamma-ray intensity measured. In the case of the $sup 93$Kr decay approximately 98.5 percent of the observed gamma-ray intensity has been accounted for by the proposed level scheme. This results from the placement of 203 of the 217 gamma rays assigned to this decay in a level scheme comprising 56 levels. Beta-branching for these decays were determined from transition intensity balances. Spin and parity assignments were proposed, whenever possible, on the basis of gamma-ray transition probabilities and deduced log ft values. A comparison is made with the available reaction data for the $sup 93$Y level scheme. In all cases an attempt has been made to explain some of the levels in terms of the nuclear shell model and decay systematics. 18 figures, 20 tables, 68 references. (auth)

Bischof, C.J.

1976-01-01T23:59:59.000Z

428

Explicit-implicit difference scheme for the joint solution of the radiative transfer and energy equations by the splitting method  

Science Conference Proceedings (OSTI)

High-order accurate explicit and implicit conservative predictor-corrector schemes are presented for the radiative transfer and energy equations in the multigroup kinetic approximation solved together by applying the splitting method with respect to ... Keywords: difference splitting schemes, radiative transfer equations

N. Ya. Moiseev

2013-03-01T23:59:59.000Z

429

The Use of TVD Limiters for Forward-in-Time Upstream-Biased Advection Schemes in Ocean Modeling  

Science Conference Proceedings (OSTI)

This paper explores the use of the constant grid flux form forward-in-time upstream-biased advection schemes for the advection of temperature and salinity in ocean modeling. The constant grid flux form schemes are shown to be an improvement over ...

Julie Pietrzak

1998-03-01T23:59:59.000Z

430

Convergence of a two-layer scheme for equations of gas dynamics in Eulerian variables with geo-physical applications  

Science Conference Proceedings (OSTI)

This paper deals with the convergence of a completely conservative, two-layer difference scheme for equations of gas dynamics in Eulerian variables. The convergence of the difference solution to the smooth solution of the original periodic Cauchy problem ... Keywords: Cauchy problem, Eulerian variables, difference scheme, partial differential equations, shallow water theory

F. Criado-Aldeanueva; F. Criado; G. Meladze

2009-03-01T23:59:59.000Z

431

A Classification Scheme for Winter Storms in the Eastern and Central United States with an emphasis on Nor'easters  

Science Conference Proceedings (OSTI)

A classification scheme for nor'easters and other winter storms (November-April) in the eastern and central United States provides real-time information on the potential impact of these storms. This scheme also may be applied to winterstorms over ...

Gregory A. Zielinski

2002-01-01T23:59:59.000Z

432

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

E-Print Network (OSTI)

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

Sharma, Vinod

433

A Comparison of Hybrid Ensemble Transform Kalman FilterOptimum Interpolation and Ensemble Square Root Filter Analysis Schemes  

Science Conference Proceedings (OSTI)

A hybrid ensemble transform Kalman filter (ETKF)optimum interpolation (OI) analysis scheme is described and compared with an ensemble square root filter (EnSRF) analysis scheme. A two-layer primitive equation model was used under perfect-model ...

Xuguang Wang; Thomas M. Hamill; Jeffrey S. Whitaker; Craig H. Bishop

2007-03-01T23:59:59.000Z

434

An adaptive implicit-explicit scheme for the DNS and LES of compressible flows on unstructured grids  

Science Conference Proceedings (OSTI)

An adaptive implicit-explicit scheme for Direct Numerical Simulation (DNS) and Large-Eddy Simulation (LES) of compressible turbulent flows on unstructured grids is developed. The method uses a node-based finite-volume discretization with Summation-by-Parts ... Keywords: Compressible flows, DNS, IMEX, LES, SAT, SBP, Time-advancement scheme, Unstructured grids

Mohammad Shoeybi; Magnus Svrd; Frank E. Ham; Parviz Moin

2010-08-01T23:59:59.000Z

435

Globally conservative properties and error estimation of a multi-symplectic scheme for Schrdinger equations with variable coefficients  

Science Conference Proceedings (OSTI)

Based on the multi-symplecticity of the Schrodinger equations with variable coefficients, we give a multi-symplectic numerical scheme, and investigate some conservative properties and error estimation of it. We show that the scheme satisfies discrete ... Keywords: Conservation laws, Error estimation, Global energy transit, Multi-symplectic integrators, Schrdinger equations

Jialin Hong; Ying Liu; Hans Munthe-Kaas; Antonella Zanna

2006-06-01T23:59:59.000Z

436

Scheme for Generation of W and W-like States of Nonidentical Particles and their Application in Teleportation  

Science Conference Proceedings (OSTI)

In this paper, a scheme is proposed for the preparation of the tripartite W state or W-like state of nonidentical particles. In our scheme, our required resources include two atoms and one cavity field, which makes our system become simple. Because each ... Keywords: 03.65.Bz, 42.50.Dv, Wstate, cavity QED, teleportation

Aixi Chen; Li Deng

2007-08-01T23:59:59.000Z

437

Fast computation of multiphase flow in porous media by implicit discontinuous Galerkin schemes with optimal ordering of elements  

Science Conference Proceedings (OSTI)

We present a family of implicit discontinuous Galerkin schemes for purely advective multiphase flow in porous media in the absence of gravity and capillary forces. To advance the solution one time step, one must solve a discrete system of nonlinear equations. ... Keywords: Implicit upwind scheme, Porous media flow, Topological sorting

Jostein R. Natvig; Knut-Andreas Lie

2008-12-01T23:59:59.000Z

438

Optimal Operation Scheme for a Cogeneration System Promoted from an Emergency Standby System Combined with Absorption Chiller  

Science Conference Proceedings (OSTI)

A novel optimal operation scheme for a cogeneration system that is promoted from an emergency standby system combined with absorption chiller is introduced. The fuel cost, Time-of-use (TOU) tariff and various operational constrains are taken into account ... Keywords: cogeneration system, Time-of-use tariff, optimal operation scheme

Shyi-Wen Wang

2010-12-01T23:59:59.000Z

439

A model specific simulation of power distribution grids for non-destructive testing of network reconfiguration schemes  

Science Conference Proceedings (OSTI)

This work describes a simulation platform used to study and test grid control schemes for electric power distribution systems. The effectiveness of proposed control schemes can be simulated using the platform and prototyped within a hardware testbed ... Keywords: distribution automation, electric power distribution systems, network reconfiguration

Christian Schegan; Valentina Cecchi; Xiaoguang Yang; Karen Miu

2010-07-01T23:59:59.000Z

440

A Scheme for Calculation of the Liquid Fraction in Mixed-Phase Stratiform Clouds in Large-Scale Models  

Science Conference Proceedings (OSTI)

A scheme for calculation of the liquid fraction fl in mixed-phase stratiform clouds has been developed for use in large-scale models. An advantage of the scheme, compared to the interpolation in temperature that is typically used, is that it ...

Leon D. Rotstayn; Brian F. Ryan; Jack J. Katzfey

2000-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

Monotonic Limiters for a Second-Order Finite-Volume Advection Scheme Using Icosahedral-Hexagonal Meshes  

Science Conference Proceedings (OSTI)

An assessment of a recently developed (by Miura) second-order numerical advection scheme for icosahedral-hexagonal grids on the sphere is presented, and the effects of monotonic limiters that can be used with the scheme are examined. The cases ...

Rashmi Mittal; William C. Skamarock

2010-12-01T23:59:59.000Z

442

20 MHz IF bandpass switched capacitor [] modulator using a high performance OTA with NCFF compensation scheme  

E-Print Network (OSTI)

Switched capacitor (SC) circuits are widely used in many applications because of their accuracy and ease of integration in CMOS technology. They are not suitable for operation in high frequencies because of the settling time limitation of amplifiers. High frequency switched capacitor circuits pose challenging design specifications on the amplifiers which cannot be met by conventional circuit design techniques. High amplifier gain is required for an accurate output, whereas fast settling time is obtained by a high gainbandwidth (GBW) product. Amplifiers that use cascading of gain stages for obtaining high gain require some robust frequency compensation schemes, and usually have a low GBW, resulting in a slow settling time. This work proposes a new compensation scheme for high gain wideband amplifiers - No Capacitor Feed Forward (NCFF) compensation scheme. NCFF scheme uses pole-zero cancellation to obtain high gain, high GBW and a good phase margin. Left half plane (LHP) zeros produced due to the feedforward path causes a positive phase shift and is used to cancel the negative phase shift of poles. Fully differential and single ended operational transconductance amplifiers (OTA) using the proposed NCFF compensation scheme have been designed and fabricated using CMOS AMI 0.5 []m technology. The fully differential OTA has a gain of 97 dB, GBW of 350 MHz and a phase margin of around 90. Sigma delta [ ] modulators use oversampling and quantization noise shaping to obtain a high dynamic range. They are well suited for use in radio and cellular systems to directly convert the narrowband IF signal centered at high frequencies to digital domain. Switched capacitor implementation of a [ ] modulator requires a fast settling amplifier to operate at high IF frequencies. The design and implementation issues of a 20 MHz IF, 80 MHz clock, fourth order switched capacitor bandpass [ ] modulator are discussed in detail. The modulator uses a high performance OTA using the proposed NCFF compensation scheme and it has been designed and fabricated using 3.3V CMOS TSMC 0.35 []m technology. The bandpass [ ] modulator has a peak SNR of 70 dB (post-layout simulations).

Thandri, Bharath Kumar

2001-01-01T23:59:59.000Z

443

Posters Objective Analysis Schemes to Monitor Atmospheric Radiation Measurement Data in Near Real-Time  

NLE Websites -- All DOE Office Websites (Extended Search)

7 7 Posters Objective Analysis Schemes to Monitor Atmospheric Radiation Measurement Data in Near Real-Time M. Splitt University of Oklahoma Norman, Oklahoma Recent work in this area by Charles Wade (1987) lays out the groundwork for monitoring data quality for projects with large networks of instruments such as the Atmospheric Radiation Measurement (ARM) Program. Wade generated objectively analyzed fields of meteorological variables (temperature, pressure, humidity, and wind) and then compared the objectively analyzed value at the sensor location with the value produced by the sensor. Wade used a Barne's objective analysis scheme to produce objective data values for a given meteorological variable (q) in two- dimensional space. The objectively analyzed value should

444

Initial Evaluation of the Cumulus Potential Scheme at the ACRF SGP Site  

NLE Websites -- All DOE Office Websites (Extended Search)

Meeting, Meeting, 12 March 2008 Initial Evaluation of the Cumulus Potential Scheme at the ACRF SGP Site Larry K. Berg, William I. Gustafson Jr., and Evgueni I. Kassianov Pacific Northwest National Laboratory ARM Science Team Meeting, 12 March 2008 Where are We Going? Development Simulation Evaluation Observations ARM Science Team Meeting, 12 March 2008 Development: Coupling Clouds to the Convective Boundary Layer * Shallow cumuli are turbulently coupled to the planetary boundary layer 4 3 2 1 0 Height (km) 6 5 4 3 2 1 0 Distance (km) Simulation courtesy of M. Ovtchinnikov ARM Science Team Meeting, 12 March 2008 Development: Coupling Clouds to the Convective Boundary Layer * Parameterization should represent this coupling * The Cumulus Potential (CuP) scheme is one way - Accounts for sub-grid

445

Aerothermal Effects of Interfacial Leakage and Film Cooling Schemes with Endwall and Leading Edge Contouring  

NLE Websites -- All DOE Office Websites (Extended Search)

Aerothermal Effects of Interfacial Aerothermal Effects of Interfacial Leakage and Film Cooling Schemes with Endwall and Leading Edge Contouring T.W. Simon and R. J. Goldstein Principal Investigators SCIES Project U/02-01-SR096/DOE PR DOE COOPERATIVE AGREEMENT DE-FC26-02NT41431 Tom J. George, Program Manger, DOE/NETL Richard Wenglarz, Manager of Research, SCIES Project Awarded (5/1/2002, 36 months) $459,007 Total Contract Value ($430,619 DOE) Gas Turbine Technology Needs and Project Objectives * Improved performance and reliability - More effective cooling of turbine first stage passage * Improve schemes for injection of endwall coolant * Realize cooling benefits of leakage flows * Understand effects of component misalignment - Reduced secondary flows * Improve with endwall axial contouring and airfoil/endwall fillets

446

Theoretical scheme of thermal-light many-ghost imaging by Nth-order intensity correlation  

Science Conference Proceedings (OSTI)

In this paper, we propose a theoretical scheme of many-ghost imaging in terms of Nth-order correlated thermal light. We obtain the Gaussian thin lens equations in the many-ghost imaging protocol. We show that it is possible to produce N-1 ghost images of an object at different places in a nonlocal fashion by means of a higher order correlated imaging process with an Nth-order correlated thermal source and correlation measurements. We investigate the visibility of the ghost images in the scheme and obtain the upper bounds of the visibility for the Nth-order correlated thermal-light ghost imaging. It is found that the visibility of the ghost images can be dramatically enhanced when the order of correlation becomes larger. It is pointed out that the many-ghost imaging phenomenon is an observable physical effect induced by higher order coherence or higher order correlations of optical fields.

Liu Yingchuan [Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081 (China); College of Mathematics and Physics, University of South China, Hengyang 421001 (China); Kuang Leman [Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Department of Physics, Hunan Normal University, Changsha 410081 (China)

2011-05-15T23:59:59.000Z

447

Thermally-induced ventilation in atria: an atrium classification scheme and promising test sites  

DOE Green Energy (OSTI)

In establishing the atrium classification scheme, specific attention was given to: climate (hot-arid, warm-humid, and temperate), atrium configuration (open, closed, and adjustable tops), and thermal mechanism (natural convection, radiative cooling, shading, and others). Application of the resulting three-dimensional (three-coordinate) matrix was considered and tested. Although the testing was for purposes of checking scheme application, the procedure indicated that most of the atria examined were of the adjustable-top configuration with daylighting the principal functional mode. However, it was noted that thermally-induced air flow was present in many of the atria classified. In the identification of promising test sites it was noted that there appears to be a shortage of buildings which meet the atrium definition. Consequently, prospective test sites were categorized as follows based upon anticipated value to the study: commercial atria already constructed, commercial atria planned or under construction, and residential atria already constructed.

Not Available

1981-06-01T23:59:59.000Z

448

EASE: An Energy-Efficient InNetwork Storage Scheme for Object Tracking  

E-Print Network (OSTI)

Abstract Energy efficiency is one of the most critical issues in the design of wireless sensor networks. Observing that many sensor applications for object tracking can tolerate a certain degree of imprecision in location data of tracked objects, this paper studies precision-constrained approximate queries that trade answer precision for energy efficiency. We develop an Energy-conserving Approximate StoragE (EASE) scheme to efficiently answer approximate location queries by keeping errorbounded imprecise location data at some designated storage node. The data impreciseness is captured by a system parameter, i.e., approximation radius. We analyze the performance of EASE in terms of message complexity and derive the optimal setting of approximation radius. We show via extensive simulation experiments that, as compared to a conventional approach, the EASE scheme cuts down the network traffic by up to 96 % and, in most cases, prolongs the network lifetime by a factor of 2?5. I.

Jianliang Xu; Xueyan Tang

2005-01-01T23:59:59.000Z

449

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

Science Conference Proceedings (OSTI)

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.

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

2011-09-01T23:59:59.000Z

450

Control schemes for an industrial rotary calciner with a heat shield around the combustion zone  

SciTech Connect

Soda ash (sodium carbonate) is produced by calcining natural trona ore (sodium sesquicarbonate) in rotary calciners. Shell overheating, the consequent deformation of the calciner shell, and heat loss are frequently encountered problems during this operation. Installation of a concentric, metallic heat shield around the calciner`s combustion zone can help to reduce the shell temperature and recover some of the energy that would otherwise be lost. Another problem often encountered is the deterioration of product quality when the system inputs deviate from their design rates. A mathematical model of the calciner with a heat shield is used to design different control schemes in order to maintain the product quality. Performance of the designed control schemes is demonstrated via computer simulation.

Ciftci, S.; Kim, N.K. [Michigan Technological Univ., Houghton, MI (United States). Dept. of Chemical Engineering] [Michigan Technological Univ., Houghton, MI (United States). Dept. of Chemical Engineering

1999-03-01T23:59:59.000Z

451

A method for relaxing the CFL-condition in time explicit schemes  

E-Print Network (OSTI)

A method for relaxing the CFL-condition, which limits the time step size in explicit methods in computational fluid dynamics, is presented. The method is based on re-formulating explicit methods in matrix form, and considering them as a special-Jacobi iteration scheme that converge efficiently if the CFL- number is less than unity. By adopting this formulation, one can design various solution methods in arbitrary dimensions that range from explicit to unconditionally stable implicit methods in which CFL-number could reach arbitrary large values. In addition, we find that adopting a specially varying time stepping scheme accelerates convergence toward steady state solutions and improves the efficiently of the solution procedure.

A. Hujeirat

2003-09-22T23:59:59.000Z

452

A radiation-hydrodynamics scheme valid from the transport to the diffusion limit  

E-Print Network (OSTI)

We present in this paper the numerical treatment of the coupling between hydrodynamics and radiative transfer. The fluid is modeled by classical conservation laws (mass, momentum and energy) and the radiation by the grey moment $M_1$ system. The scheme introduced is able to compute accurate numerical solution over a broad class of regimes from the transport to the diffusive limits. We propose an asymptotic preserving modification of the HLLE scheme in order to treat correctly the diffusion limit. Several numerical results are presented, which show that this approach is robust and have the correct behavior in both the diffusive and free-streaming limits. In the last numerical example we test this approach on a complex physical case by considering the collapse of a gas cloud leading to a proto-stellar structure which, among other features, exhibits very steep opacity gradients.

E. Audit; P. Charrier; J. -P. Chize; B. Dubroca

2002-06-17T23:59:59.000Z

453

Voltage protection scheme for MG sets used to drive inductive energy storage systems  

DOE Green Energy (OSTI)

A recent tokamak proposal at ORNL called for MG (motor-generator) sets to drive the ohmic heating (OH) coil, which was to be subjected to 20 kV immediately after coil charge-up to initiate the experiment. Since most rotating machinery is inherently low voltage, including the machines available at ORNL, a mechanism was necessary to isolate the generators from the high voltage portions of the circuit before the appearance of this voltage. It is not the expected 20 kV at the coil that causes difficulty, because the main interrupting switch handles this. The voltage induced in the armature due to di/dt and the possibility of faults are the greatest causes for concern and are responsible for the complexity of the voltage protection scheme, which must accommodate any possible combination of fault time and location. Such a protection scheme is presented in this paper.

Campen, G.L.; Easter, R.B.

1977-01-01T23:59:59.000Z

454

On the Whitham hierarchy: dressing scheme, string equations and additional symmetrie  

E-Print Network (OSTI)

A new description of the universal Whitham hierarchy in terms of a factorization problem in the Lie group of canonical transformations is provided. This scheme allows us to give a natural description of dressing transformations, string equations and additional symmetries for the Whitham hierarchy. We show how to dress any given solution and prove that any solution of the hierarchy may be undressed, and therefore comes from a factorization of a canonical transformation. A particulary important function, related to the $\\tau$-function, appears as a potential of the hierarchy. We introduce a class of string equations which extends and contains previous classes of string equations considered by Krichever and by Takasaki and Takebe. The scheme is also applied for an convenient derivation of additional symmetries. Moreover, new functional symmetries of the Zakharov extension of the Benney gas equations are given and the action of additional symmetries over the potential in terms of linear PDEs is characterized.

Manuel Manas; Elena Medina; Luis Martinez Alonso

2005-09-06T23:59:59.000Z

455

RATIONAL CHEREDNIK ALGEBRAS AND HILBERT SCHEMES I. GORDON AND J. T. STAFFORD  

E-Print Network (OSTI)

RATIONAL CHEREDNIK ALGEBRAS AND HILBERT SCHEMES I. GORDON AND J. T. STAFFORD Dedicated to Mike for their hospitality and financial support. 1 #12;2 I. GORDON AND J. T. STAFFORD 1. Introduction 1.1. This is the first step in the proof of Theorem 1.4 is given by: #12;4 I. GORDON AND J. T. STAFFORD 1.7. Proposition

Gordon, Iain

456

New stretcher scheme for a parametric amplifier of chirped pulses with frequency conversion  

Science Conference Proceedings (OSTI)

The properties of hybrid prism-grating dispersion systems are studied. The scheme of a prism-grating stretcher matched to a standard compressor in the phase dispersion up to the fourth order inclusive is developed for a petawatt laser complex based on the optical parametric chirped-pulse amplification. The stretcher was used to obtain the {approx}200-TW peak power of laser radiation. (control of laser radiation parameters)

Freidman, Gennadii I; Yakovlev, I V [Institute of Applied Physics, Russian Academy of Sciences, Nizhnii Novgorod (Russian Federation)

2007-02-28T23:59:59.000Z

457

Optimal Self Tuned Variable Structure Sliding Mode for Coordinated Wind-FC-Diesel Utilization Scheme  

Science Conference Proceedings (OSTI)

The modeling and coordinated control strategy based on self tuned variable structure sliding mode dynamic controller for a winddiesel-fuel cell renewable generation system with battery backup are discussed in this paper. The proposed hybrid scheme ... Keywords: Diesel-driven generator, Wind induction generator, PMDC motor drives, fuel cell, Backup Battery, Dynamic Filter Compensator, Green Power Filter, Multi Objective Particle Swarm Optimization MOPSO

Adel M. Sharaf; Adel A. A. El-Gammal

2010-05-01T23:59:59.000Z

458

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

E-Print Network (OSTI)

these approaches create distortions that can prevent entry from third parties and undermine the attendant incentives for companies to reduce CO2 emissions and for consumers to reduce electricity consumption. In other sectors, pricing responses may be influenced... ETS were built on many years of economic research into theories of emissions trading, combined with practical experience of emission trading schemes principally in the USA. Yet the analogies are far from exact, and the emerging experience...

Grubb, Michael; Neuhoff, Karsten

459

The description of $^{150}$Nd Nucleus by a new alternative scheme  

E-Print Network (OSTI)

A new scheme was recently proposed in which the usual SU(3) quadrupole-quadrupole interaction was replaced by an O(6) cubic interaction in the Interacting Boson Model, and also successfully applied to the description of $^{152}$Sm for the N = 90 rare earth isotones with X(5) symmetry. By using this new scheme, in the present work, we further explore the properties of another candidate of $^{150}$Nd for the N=90 with X(5) symmetry. The low-lying energy levels and E2 transition rates are calculated and compared with the experimental data. The results show that the new scheme can also reasonably describe the experimental low-lying spectrum and the intraband and the interband E2 transitions for $^{150}$Nd. However, for the low-lying spectrum, the O(6) cubic interaction seems better in describing the energy levels, especially in higher excited states and $\\gamma$ band, yet the $0^{+}_{2}$ level within the $\\beta$ band is lower than the corresponding experimental value and, the U(5)-SU(3) scheme seems better to describe the low-lying levels of $\\beta$ band; and for the B(E2) transition, for the intraband transitions within the ground band and some interband transitions between the $\\beta$ band and the ground band, the results from O(6) cubic interaction are better than those from SU(3) quadrupole-quadrupole interaction, yet of which seems better to describe the intraband E2 transitions within $\\beta$ band. The present work is very meaningful in helping us to deeply understand the new characteristics of symmetry by the higher order O(6) cubic interaction.

Dai Lian-Rong; Zhong Wei-Wei; Cong Mei-Ling

2013-07-30T23:59:59.000Z

460

Control scheme for power modulation of a free piston Stirling engine  

DOE Patents (OSTI)

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.

Dhar, Manmohan (Schenectady, NY)

1989-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "indonesia-gtz mini-hydropower schemes" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Variable order spherical harmonic expansion scheme for the radiative transport equation using finite elements  

SciTech Connect

Highlights: {yields} We developed a variable order global basis scheme to solve light transport in 3D. {yields} Based on finite elements, the method can be applied to a wide class of geometries. {yields} It is computationally cheap when compared to the fixed order scheme. {yields} Comparisons with local basis method and other models demonstrate its accuracy. {yields} Addresses problems encountered n modeling of light transport in human brain. - Abstract: We propose the P{sub N} approximation based on a finite element framework for solving the radiative transport equation with optical tomography as the primary application area. The key idea is to employ a variable order spherical harmonic expansion for angular discretization based on the proximity to the source and the local scattering coefficient. The proposed scheme is shown to be computationally efficient compared to employing homogeneously high orders of expansion everywhere in the domain. In addition the numerical method is shown to accurately describe the void regions encountered in the forward modeling of real-life specimens such as infant brains. The accuracy of the method is demonstrated over three model problems where the P{sub N} approximation is compared against Monte Carlo simulations and other state-of-the-art methods.

Surya Mohan, P., E-mail: sprerapa@cs.ucl.ac.uk [Department of Computer Science, University College London, Gower Street, London WC1E 6BT (United Kingdom); Tarvainen, Tanja, E-mail: tanja.tarvainen@uef.fi [Department of Computer Science, University College London, Gower Street, London WC1E 6BT (United Kingdom); Department of Applied Physics, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio (Finland); Schweiger, Martin, E-mail: martins@medphys.ucl.ac.uk [Department of Computer Science, University College London, Gower Street, London WC1E 6BT (United Kingdom); Pulkkinen, Aki, E-mail: pulkkine@sten.sunnybrook.utoronto.ca [Department of Applied Physics, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio (Finland); Sunnybrook Research Institute, Sunnybrook Health Sciences Centre, 2075 Bayview Ave., Toronto, M4N 3M5 (Canada); Arridge, Simon R., E-mail: S.Arridge@cs.ucl.ac.uk [Department of Computer Science, University College London, Gower Street, London WC1E 6BT (United Kingdom)

2011-08-10T23:59:59.000Z

462

WHAM: A WENO-based general relativistic numerical scheme I: Hydrodynamics  

E-Print Network (OSTI)

Active galactic nuclei, x-ray binaries, pulsars, and gamma-ray bursts are all believed to be powered by compact objects surrounded by relativistic plasma flows driving phenomena such as accretion, winds, and jets. These flows are often accurately modelled by the relativistic magnetohydrodynamics (MHD) approximation. Time-dependent numerical MHD simulations have proven to be especially insightful, but one regime that remains difficult to simulate is when the energy scales (kinetic, thermal, magnetic) within the plasma become disparate. We develop a numerical scheme that significantly improves the accuracy and robustness of the solution in this regime. We use a modified form of the WENO method to construct a finite-volume general relativistic hydrodynamics code called WHAM that converges at fifth order. We avoid (1) field-by-field decomposition by adaptively reducing down to 2-point stencils near discontinuities for a more accurate treatment of shocks, and (2) excessive reduction to low order stencils, as in the standard WENO formalism, by maintaining high order accuracy in smooth monotonic flows. Our scheme performs the proper surface integral of the fluxes, converts cell averaged conserved quantities to point conserved quantities before performing the reconstruction step, and correctly averages all source terms. We demonstrate that the scheme is robust in strong shocks, very accurate in smooth flows, and maintains accuracy even when the energy scales in the flow are highly disparate.

Alexander Tchekhovskoy; Jonathan C. McKinney; Ramesh Narayan

2007-04-20T23:59:59.000Z

463

Adaptive feedforward and feedback control schemes for sliding mode controlled power converters  

E-Print Network (OSTI)

AbstractA major disadvantage of applying sliding mode control to dc/dc converters is that the steady-state switching frequency is affected by line and load variations. This is undesirable as it complicates the design of the input and output filters. To reduce switching frequency deviation in the events of line and load variations, an adaptive feedforward control scheme that varies the hysteresis band according to the change of line input voltage and an adaptive feedback control scheme that varies the control parameter (i.e., sliding coefficient) according to the change of the output load are proposed. This paper presents a thorough investigation into the problem and the effectiveness of the proposed solutions. In addition, methods of implementing the proposed adaptive control strategies are discussed. Experimental results confirm that the adaptive control schemes are capable of reducing the switching frequency variations caused by both line and load variations. Index TermsAdaptive feedback control, adaptive feedforward control, buck converter, hysteresis modulation, pulse-width-modulation (PWM), sliding mode (SM)control. I.

Siew-chong Tan; Y. M. Lai; Chi K. Tse; Martin K. H. Cheung; Student Member

2006-01-01T23:59:59.000Z

464

A Round-based Pricing Scheme for Maximizing Service Provider's Revenue in P2PTV Networks  

E-Print Network (OSTI)

In this paper, we analyze a round-based pricing scheme that encourages favorable behavior from users of real-time P2P applications like P2PTV. In the design of pricing schemes, we consider price to be a function of usage and capacity of download/upload streams, and quality of content served. Users are consumers and servers at the same time in such networks, and often exhibit behavior that is unfavorable towards maximization of social benefits. Traditionally, network designers have overcome this difficulty by building-in traffic latencies. However, using simulations, we show that appropriate pricing schemes and usage terms can enable designers to limit required traffic latencies, and be able to earn nearly 30% extra revenue from providing P2PTV services. The service provider adjusts the prices of individual programs incrementally within rounds, while making relatively large-scale adjustments at the end of each round. Through simulations, we show that it is most beneficial for the service provider to carry out ...

Bhutani, Gitanjali

2009-01-01T23:59:59.000Z

465

Convergence of a Finite Volume Scheme for Gas Water Flow in a Multi-Dimensional Porous Media  

E-Print Network (OSTI)

A classical model for water-gas flows in porous media is considered. The degenerate coupled system of equations obtained by mass conservation is usually approximated by finite volume schemes in the oil reservoir simulations. The convergence properties of these schemes are only known for incompressible fluids. This chapter deals with construction and convergence analysis of a finite volume scheme for compressible and immiscible flow in porous media. In comparison with incompressible fluid, compressible fluids requires more powerful techniques. We present a new result of convergence in a two or three dimensional porous medium and under the only modification that the density of gas depends on global pressure.

Bendahmane, Mostafa; Saad, Mazen

2011-01-01T23:59:59.000Z

466

Simulation of an Orographic Precipitation Event during IMPROVE-2. Part I: Evaluation of the Control Run Using a Triple-Moment Bulk Microphysics Scheme  

Science Conference Proceedings (OSTI)

This paper reports the first evaluation of the MilbrandtYau multimoment bulk microphysics scheme against in situ microphysical measurements. The full triple-moment version of the scheme was used to simulate a case of orographically enhanced ...

J. A. Milbrandt; M. K. Yau; J. Mailhot; S. Blair

2008-10-01T23:59:59.000Z

467

Tripleclouds: An Efficient Method for Representing Horizontal Cloud Inhomogeneity in 1D Radiation Schemes by Using Three Regions at Each Height  

Science Conference Proceedings (OSTI)

Radiation schemes in general circulation models currently make a number of simplifications when accounting for clouds, one of the most important being the removal of horizontal inhomogeneity. A new scheme is presented that attempts to account for ...

Jonathan K. P. Shonk; Robin J. Hogan

2008-06-01T23:59:59.000Z

468

A Mass-Conservative, Positive-Definite, and Efficient Eulerian Advection Scheme in Spherical Geometry and on a Nonuniform Grid System  

Science Conference Proceedings (OSTI)

The flux-form advection scheme of Bott is modified for the spherical coordinates, combined with the expanded-polar-zone (EPZ) technique to improve the overall performance of the advection calculations. With the EPZ technique, this Eulerian scheme ...

Yonghong Li; Julius S. Chang

1996-10-01T23:59:59.000Z

469

A Square Prism Urban Canopy Scheme for the NHM and Its Evaluation on Summer Conditions in the Tokyo Metropolitan Area, Japan  

Science Conference Proceedings (OSTI)

A single-layered square prism urban canopy (SPUC) scheme for the Japan Meteorological Agency nonhydrostatic model (NHM) was developed. This scheme considers the urban canopy layer with square prismshaped buildings. The basic concept of this ...

Toshinori Aoyagi; Naoko Seino

2011-07-01T23:59:59.000Z

470

Data Assimilation with Gaussian Mixture Models Using the Dynamically Orthogonal Field Equations. Part I: Theory and Scheme  

Science Conference Proceedings (OSTI)

This work introduces and derives an efficient, data-driven assimilation scheme, focused on a time-dependent stochastic subspace that respects nonlinear dynamics and captures non-Gaussian statistics as it occurs. The motivation is to obtain a ...

Thomas Sondergaard; Pierre F. J. Lermusiaux

2013-06-01T23:59:59.000Z

471

Developments in Normal Mode Initialization. Part II: A New Method and its Comparison with Currently Used Schemes  

Science Conference Proceedings (OSTI)

The analysis of Part I suggested that the temporal characteristics of the nonlinear terms in the equations of motion could introduce convergence problems in currently used schemes for normal mode initialization (NMI). In Part II we 1) introduce a ...

Philip J. Rasch

1985-10-01T23:59:59.000Z

472

A New Scheme for Effective Roughness Length and Effective Zero-Plane Displacement in Land Surface Models  

Science Conference Proceedings (OSTI)

Based on the similarity theory of the atmospheric surface layer and the flux conservation and mass conservation laws, a new scheme for determining the effective roughness length (ERL) and the effective zero-plane displacement (EZPD) for a ...

Zhong Zhong; Wei Lu; Shuai Song; Yaocun Zhang

2011-12-01T23:59:59.000Z

473

Turbulent Transfer Coefficients and Calculation of Air Temperature inside Tall Grass Canopies in LandAtmosphere Schemes for Environmental Modeling  

Science Conference Proceedings (OSTI)

A method for estimating profiles of turbulent transfer coefficients inside a vegetation canopy and their use in calculating the air temperature inside tall grass canopies in land surface schemes for environmental modeling is presented. The ...

D. T. Mihailovic; K. Alapaty; B. Lalic; I. Arsenic; B. Rajkovic; S. Malinovic

2004-10-01T23:59:59.000Z

474

Turbulent Heat Fluxes in Urban Areas: Observations and a Local-Scale Urban Meteorological Parameterization Scheme (LUMPS)  

Science Conference Proceedings (OSTI)

A linked set of simple equations specifically designed to calculate heat fluxes for the urban environment is presented. This local-scale urban meteorological parameterization scheme (LUMPS), which has similarities to the hybrid plume dispersion ...

C. S. B. Grimmond; T. R. Oke

2002-07-01T23:59:59.000Z

475

Effects of Spatial Aggregation of Initial Conditions and Forcing Data on Modeling Snowmelt Using a Land Surface Scheme  

Science Conference Proceedings (OSTI)

Small-scale topography and snow redistribution have important effects on snow-cover heterogeneity and the timing, rate, and duration of spring snowmelt in mountain tundra environments. However, land surface schemes (LSSs) are usually applied as a ...

Pablo F. Dornes; John W. Pomeroy; Alain Pietroniro; Diana L. Verseghy

2008-08-01T23:59:59.000Z

476

The Theoretical, Discrete, and Actual Response of the Barnes Objective Analysis Scheme for One- and Two-Dimensional Fields  

Science Conference Proceedings (OSTI)

This paper examines the response of the Barnes objective analysis scheme as a function of wavenumber or wavelength and extends previous work in two primary areas. First, the first- and second-pass theoretical response functions for continuous two-...

Patricia M. Pauley; Xiaihua Wu

1990-05-01T23:59:59.000Z

477

The Influence of the Inclusion of Soil Freezing on Simulations by a SoilVegetationAtmosphere Transfer Scheme  

Science Conference Proceedings (OSTI)

The interactions between the soil, biosphere, and atmosphere (ISBA) land surface parameterization scheme has been modified to include soil ice. The liquid water equivalent volumetric ice content is modeled using two reservoirs within the soil: a ...

A. Boone; V. Masson; T. Meyers; J. Noilhan

2000-09-01T23:59:59.000Z

478

The Impact of Root Weighting on the Response of Transpiration to Moisture Stress in Land Surface Schemes  

Science Conference Proceedings (OSTI)

Land surface schemes (LSSs) for large-scale climate models use a variety of different methods to represent the influence of soil moisture on transpiration. One area in which they differ is in the treatment of vertical soil moisture distribution. ...

Carl E. Desborough

1997-08-01T23:59:59.000Z

479

Sensitivity of Idealized Squall-Line Simulations to the Level of Complexity Used in Two-Moment Bulk Microphysics Schemes  

Science Conference Proceedings (OSTI)

This paper investigates the level of complexity that is needed within bulk microphysics schemes to represent the essential features associated with deep convection. To do so, the sensitivity of surface precipitation is evaluated in two-dimensional ...

Kwinten Van Weverberg; Andrew M. Vogelmann; Hugh Morrison; Jason A. Milbrandt

2012-06-01T23:59:59.000Z

480

Prediction of solid-aqueous equilibria: Scheme to combine first-principles calculations of solids with experimental aqueous states  

E-Print Network (OSTI)

We present an efficient scheme for combining ab initio calculated solid states with experimental aqueous states through a framework of consistent reference energies. Our work enables accurate prediction of phase stability ...

Persson, Kristin A.

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481

Explicit Forecasts of Winter Precipitation Using an Improved Bulk Microphysics Scheme. Part II: Implementation of a New Snow Parameterization  

Science Conference Proceedings (OSTI)

A new bulk microphysical parameterization (BMP) has been developed for use with the Weather Research and Forecasting (WRF) Model or other mesoscale models. As compared with earlier single-moment BMPs, the new scheme incorporates a large number of ...

Gregory Thompson; Paul R. Field; Roy M. Rasmussen; William D. Hall

2008-12-01T23:59:59.000Z

482

Study of full implicit petroleum engineering finite volume scheme for compressible two phase flow in porous media  

E-Print Network (OSTI)

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.

Saad, Bilal

2012-01-01T23:59:59.000Z

483

Incorporating the Effects of 3D Radiative Transfer in the Presence of Clouds into Two-Stream Multilayer Radiation Schemes  

Science Conference Proceedings (OSTI)

This paper presents a new method for representing the important effects of horizontal radiation transport through cloud sides in two-stream radiation schemes. Ordinarily, the radiative transfer equations are discretized separately for the clear ...

Robin J. Hogan; Jonathan K. P. Shonk

2013-02-01T23:59:59.000Z

484

An Examination of Local versus Nonlocal Aspects of a TKE-Based Boundary Layer Scheme in Clear Convective Conditions  

Science Conference Proceedings (OSTI)

In this study, the ability of a turbulent kinetic energy (TKE)based boundary layer scheme to reproduce the rapid evolution of the planetary boundary layer (PBL) observed during two clear convective days is examined together with the impact of ...

Stphane Blair; Jocelyn Mailhot; J. Walter Strapp; J. Ian MacPherson

1999-10-01T23:59:59.000Z

485

Sensitivity of Latent Heat Flux from PILPS Land-Surface Schemes to Perturbations of Surface Air Temperature  

Science Conference Proceedings (OSTI)

In the PILPS Phase 2a experiment, 23 land-surface schemes were compared in an off-line control experiment using observed meteorological data from Cabauw, the Netherlands. Two simple sensitivity experiments were also undertaken in which the ...

Weiqing Qu; A. Henderson-Sellers; A. J. Pitman; T. H. Chen; F. Abramopoulos; A. Boone; S. Chang; F. Chen; Y. Dai; R. E. Dickinson; L. Dmenil; M. Ek; N. Gedney; Y. M. Gusev; J. Kim; R. Koster; E. A. Kowalczyk; J. Lean; D. Lettenmaier; X. Liang; J.-F. Mahfouf; H.-T. Mengelkamp; K. Mitchell; O. N. Nasonova; J. Noilhan; A. Robock; C. Rosenzweig; J. Schaake; C. A. Schlosser; J.-P. Schulz; A. B. Shmakin; D. L. Verseghy; P. Wetzel; E. F. Wood; Z.-L. Yang; Q. Zeng

1998-06-01T23:59:59.000Z

486

A Preoperational Scheme for Calculating Sea Surface Height by Bernoulli Inverse of Argo Float Data in the North Atlantic  

Science Conference Proceedings (OSTI)

A preoperational scheme has been implemented to calculate sea surface height fields at 7-day intervals over the North Atlantic. Input data from Argo floats is downloaded and processed in nearreal time. The solution method is by Bernoulli ...

Steven G. Alderson; Peter D. Killworth

2005-09-01T23:59:59.000Z

487

Limited-Area Fourier Spectral Models and Data Analysis Schemes: Windows, Fourier Extension, Davies Relaxation, and All That  

Science Conference Proceedings (OSTI)

Regional spectral models have previously periodized and blended limited-area data through ad hoc low-order schemes justified by intuition and empiricism. By using infinitely differentiable window functions or bells borrowed from wavelet ...

John P. Boyd

2005-07-01T23:59:59.000Z

488

Conservative Transport Schemes for Spherical Geodesic Grids: High-Order Flux Operators for ODE-Based Time Integration  

Science Conference Proceedings (OSTI)

Higher-order finite-volume flux operators for transport algorithms used within RungeKutta time integration schemes on irregular Voronoi (hexagonal) meshes are proposed and tested. These operators are generalizations of third- and fourth-order ...

William C. Skamarock; Almut Gassmann

2011-09-01T23:59:59.000Z

489

Mesoscale Modeling of Springtime Arctic Mixed-Phase Stratiform Clouds Using a New Two-Moment Bulk Microphysics Scheme  

Science Conference Proceedings (OSTI)

A new two-moment bulk microphysics scheme is implemented into the polar version of the fifth-generation Pennsylvania State UniversityNCAR Mesoscale Model (MM5) to simulate arctic mixed-phase boundary layer stratiform clouds observed during ...

H. Morrison; J. O. Pinto

2005-10-01T23:59:59.000Z

490

Over-Allocation or Abatement? A Preliminary Analysis of the EU Emissions Trading Scheme Based on the 2005 Emissions Data  

E-Print Network (OSTI)

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, ...

Ellerman, A. Denny.

491

Effects of mineral aerosols on the summertime climate of southwest Asia: Incorporating subgrid variability in a dust emission scheme  

E-Print Network (OSTI)

[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 ...

Marcella, Marc Pace

492

A Global Multilevel Atmospheric Model Using a Vector Semi-Lagrangian Finite-Difference Scheme. Part II: Version with Physics  

Science Conference Proceedings (OSTI)

Full physical parameterzations have been incorporated into the global model using a two-time-level, semi-Lagrangian, semi-implicit finite-difference integration scheme that was described in Part I of this work. Virtual temperature effects have ...

S. Moorthi; R. W. Higgins; J. R. Bates

1995-05-01T23:59:59.000Z

493

Biol. Cybernetics 32, 85--93 (1979) Transformation and Relational-Structure Schemes for Visual Pattern Recognition  

E-Print Network (OSTI)

Biol. Cybernetics 32, 85--93 (1979) Transformation and Relational-Structure Schemes for Visual patterns under visual inspection are judged to be the same, independent in this case of pattern position

Foster, David H.

494

A Potential Enstrophy and Energy Conserving Numerical Scheme for Solution of the Shallow-Water Equations on a Geodesic Grid  

Science Conference Proceedings (OSTI)

Using the shallow water equations, a numerical framework on a spherical geodesic grid that conserves domain-integrated mass, potential vorticity, potential enstrophy, and total energy is developed. The numerical scheme is equally applicable to ...

Todd D. Ringler; David A. Randall

2002-05-01T23:59:59.000Z

495

A Comparison of the Hybrid and EnSRF Analysis Schemes in the Presence of Model Errors due to Unresolved Scales  

Science Conference Proceedings (OSTI)

A hybrid analysis scheme is compared with an ensemble square root filter (EnSRF) analysis scheme in the presence of model errors as a follow-up to a previous perfect-model comparison. In the hybrid scheme, the ensemble perturbations are updated ...

Xuguang Wang; Thomas M. Hamill; Jeffrey S. Whitaker; Craig H. Bishop

2009-10-01T23:59:59.000Z

496

On the Accuracy of Finite-Volume Schemes for Fluctuating Hydrodynamics  

E-Print Network (OSTI)

This paper describes the development and analysis of finite-volume methods for the Landau-Lifshitz Navier-Stokes (LLNS) equations and related stochastic partial differential equations in fluid dynamics. The LLNS equations incorporate thermal fluctuations into macroscopic hydrodynamics by the addition of white-noise fluxes whose magnitudes are set by a fluctuation-dissipation relation. Originally derived for equilibrium fluctuations, the LLNS equations have also been shown to be accurate for non-equilibrium systems. Previous studies of numerical methods for the LLNS equations focused primarily on measuring variances and correlations computed at equilibrium and for selected non-equilibrium flows. In this paper, we introduce a more systematic approach based on studying discrete equilibrium structure factors for a broad class of explicit linear finite-volume schemes. This new approach provides a better characterization of the accuracy of a spatio-temporal discretization as a function of wavenumber and frequency, allowing us to distinguish between behavior at long wavelengths, where accuracy is a prime concern, and short wavelengths, where stability concerns are of greater importance. We use this analysis to develop a specialized third-order Runge Kutta scheme that minimizes the temporal integration error in the discrete structure factor at long wavelengths for the one-dimensional linearized LLNS equations. Together with a novel method for discretizing the stochastic stress tensor in dimension larger than one, our improved temporal integrator yields a scheme for the three-dimensional equations that satisfies a discrete fluctuation-dissipation balance for small time steps and is also sufficiently accurate even for time steps close to the stability limit.

A. Donev; E. Vanden-Eijnden; A. L. Garcia; J. B. Bell

2009-06-12T23:59:59.000Z

497

A method for enhancing the stability and robustness of explicit schemes in astrophysical fluid dynamics  

E-Print Network (OSTI)

A method for enhancing the stability and robustness of explicit schemes in computational fluid dynamics is presented. The method is based in reformulating explicit schemes in matrix form, which cane modified gradually into semi or strongly-implicit schemes. From the point of view of matrix-algebra, explicit numerical methods are special cases in which the global matrix of coefficients is reduced to the identity matrix $I$. This extreme simplification leads to severer stability range, hence of their robustness. In this paper it is shown that a condition, which is similar to the Courant-Friedrich-Levy (CFL) condition can be obtained from the stability requirement of inversion of the coefficient matrix. This condition is shown to be relax-able, and that a class of methods that range from explicit to strongly implicit methods can be constructed, whose degree of implicitness depends on the number of coefficients used in constructing the corresponding coefficient-matrices. Special attention is given to a simple and tractable semi-explicit method, which is obtained by modifying the coefficient matrix from the identity matrix $I$ into a diagonal-matrix $D$. This method is shown to be stable, robust and it can be applied to search for stationary solutions using large CFL-numbers, though it converges slower than its implicit counterpart. Moreover, the method can be applied to follow the evolution of strongly time-dependent flows, though it is not as efficient as normal explicit methods. In addition, we find that the residual smoothing method accelerates convergene toward steady state solutions considerably and improves the efficiency of the solution procedure.

A. A. Hujeirat

2004-10-26T23:59:59.000Z

498

Application of a medium-range global hydrologic probabilistic forecast scheme to the Ohio River Basin  

Science Conference Proceedings (OSTI)

A 10-day globally applicable flood prediction scheme was evaluated using the Ohio River basin as a test site for the period 2003-2007. The Variable Infiltration Capacity (VIC) hydrology model was initialized with the European Centre for Medium Range Weather Forecasts (ECMWF) analysis temperatures and wind, and Tropical Rainfall Monitoring Mission Multi Satellite Precipitation Analysis (TMPA) precipitation up to the day of forecast. In forecast mode, the VIC model was then forced with a calibrated and statistically downscaled ECMWF ensemble prediction system (EPS) 10-day ensemble forecast. A parallel set up was used where ECMWF EPS forecasts were interpolated to the spatial scale of the hydrology model. Each set of forecasts was extended by 5 days using monthly mean climatological variables and zero precipitation in order to account for the effect of initial conditions. The 15-day spatially distributed ensemble runoff forecasts were then routed to four locations in the basin, each with different drainage areas. Surrogates for observed daily runoff and flow were provided by the reference run, specifically VIC simulation forced with ECMWF analysis fields and TMPA precipitation fields. The flood prediction scheme using the calibrated and downscaled ECMWF EPS forecasts was shown to be more accurate and reliable than interpolated forecasts for both daily distributed runoff forecasts and daily flow forecasts. Initial and antecedent conditions dominated the flow forecasts for lead times shorter than the time of concentration depending on the flow forecast amounts and the drainage area sizes. The flood prediction scheme had useful skill for the 10 following days at all sites.

Voisin, Nathalie; Pappenberger, Florian; Lettenmaier, D. P.; Buizza, Roberto; Schaake, John

2011-08-15T23:59:59.000Z

499

Study of Scheme Transformations to Remove Higher-Loop Terms in the $?$ Function of a Gauge Theory  

E-Print Network (OSTI)

Since three-loop and higher-loop terms in the $\\beta$ function of a gauge theory are scheme-dependent, one can, at least for sufficiently small coupling, carry out a scheme transformation that removes these terms. A basic question concerns the extent to which this can be done at an infrared fixed point of an asymptotically free gauge theory. This is important for quantitative analyses of the scheme dependence of such a fixed point. Here we study a scheme transformation $S_{R,m}$ with $m \\ge 2$ that is constructed so as to remove the terms in the beta function at loop order $\\ell=3$ to $\\ell=m+1$, inclusive. Starting from an arbitrary initial scheme, we present general expressions for the coefficients of terms of loop order $\\ell$ in the beta function in the transformed scheme from $\\ell=m+2$ up to $\\ell=8$. Extending a previous study of $S_{R,2}$, we investigate the range of applicability of the $S_{R,3}$ scheme transformation in an asymptotically free SU($N_c$) gauge theory with an infrared zero in $\\beta$ depending on the number, $N_f$, of fermions in the theory. We show that this $S_{R,3}$ scheme transformation can only be applied self-consistently in a restricted range of $N_f$ with a correspondingly small value of infrared fixed-point coupling. We also study the effect of higher-loop terms on the beta function of a U(1) gauge theory.

Robert Shrock

2013-05-28T23:59:59.000Z

500

An enhanced burst-polling based delta dynamic bandwidth allocation scheme for QoS over E-PONs  

Science Conference Proceedings (OSTI)

A new burst-polling based delta dynamic bandwidth allocation (DBA) scheme is proposed for quality of services (QoS) using class of services (CoS) in Ethernet passive optical networks (E-PON). The proposed scheme consists of two parts: one is inter scheduling, ... Keywords: dynamic bandwidth allocation (DBA), ethernet passive optical networks (E-PON), quality-of-service (QoS)

Yeon-Mo Yang; Ji-Myong Nho; Byung-Ha Ahn

2004-10-01T23:59:59.000Z