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1

Dirichlet Process Mixtures of Generalized Linear Models  

Science Conference Proceedings (OSTI)

We propose Dirichlet Process mixtures of Generalized Linear Models (DP-GLM), a new class of methods for nonparametric regression. Given a data set of input-response pairs, the DP-GLM produces a global model of the joint distribution through a mixture ...

Lauren A. Hannah; David M. Blei; Warren B. Powell

2011-02-01T23:59:59.000Z

2

Combining quasi and empirical likelihoods in generalized linear models with missing responses  

Science Conference Proceedings (OSTI)

By only specifying the conditional mean and variance functions of the response variable given covariates, the quasi-likelihood can produce valid semiparametric inference for regression parameter in generalized linear models (GLMs). However, in many studies, ... Keywords: 62F12, 62F30, 62G10, Auxiliary information, Combined quasi and empirical likelihood, Generalized linear models, Missing responses, Wilks' theorem

Tianqing Liu; Xiaohui Yuan

2012-10-01T23:59:59.000Z

3

Linearization of an Oceanic General Circulation Model for Data Assimilation and Climate Studies  

Science Conference Proceedings (OSTI)

A recipe for the linearization and state reduction of a general circulation model (GCM) is evaluated in a North Pacific test basin. The underlying assumption is that modern GCMs are, or will become, sufficiently accurate so that large-scale ...

Dimitris Menemenlis; Carl Wunsch

1997-12-01T23:59:59.000Z

4

Variational bayesian inference for point process generalized linear models in neural spike trains analysis  

E-Print Network (OSTI)

Point process generalized linear models (GLMs) have been widely used for neural spike trains analysis. Statistical inference for GLMs include maximum likelihood and Bayesian estimation. Variational Bayesian (VB) methods ...

Chen, Zhe

5

A Method for Direct Solution of a Steady Linearized Spectral General Circulation Model  

Science Conference Proceedings (OSTI)

A steady linearized version of a general circulation model (GCM) is a potentially useful tool for diagnosis and understanding of the time-mean solutions of the GCM. A method is developed for direct solution of the linearized equations. The method ...

Edwin K. Schneider

1989-10-01T23:59:59.000Z

6

Generalized linear model-based expert system for estimating the cost of transportation projects  

Science Conference Proceedings (OSTI)

Timely effective cost management requires reliable cost estimates at every stage of project development. While underestimation of transportation costs seems to be a global trend, improving early cost prediction accuracy in estimates is difficult. This ... Keywords: Cost management, Expert system, Generalized linear model, Relational database, Transportation projects

Jui-Sheng Chou

2009-04-01T23:59:59.000Z

7

Analysis of General Circulation Model Sea-Surface Temperature Anomaly Simulations Using a Linear Model. Part I: Forced Solutions  

Science Conference Proceedings (OSTI)

Experiments are presented which indicate that many features of the response of a general circulation model to sea-surface temperature anomalies in the equatorial Pacific east of the dateline can be reproduced with a linear nondivergent barotropic ...

Grant Branstator

1985-11-01T23:59:59.000Z

8

A generalized linear-quadratic model incorporating reciprocal time pattern of radiation damage repair  

Science Conference Proceedings (OSTI)

Purpose: It has been conventionally assumed that the repair rate for sublethal damage (SLD) remains constant during the entire radiation course. However, increasing evidence from animal studies suggest that this may not the case. Rather, it appears that the repair rate for radiation-induced SLD slows down with increasing time. Such a slowdown in repair would suggest that the exponential repair pattern would not necessarily accurately predict repair process. As a result, the purpose of this study was to investigate a new generalized linear-quadratic (LQ) model incorporating a repair pattern with reciprocal time. The new formulas were tested with published experimental data. Methods: The LQ model has been widely used in radiation therapy, and the parameter G in the surviving fraction represents the repair process of sublethal damage with T{sub r} as the repair half-time. When a reciprocal pattern of repair process was adopted, a closed form of G was derived analytically for arbitrary radiation schemes. The published animal data adopted to test the reciprocal formulas. Results: A generalized LQ model to describe the repair process in a reciprocal pattern was obtained. Subsequently, formulas for special cases were derived from this general form. The reciprocal model showed a better fit to the animal data than the exponential model, particularly for the ED50 data (reduced {chi}{sup 2}{sub min} of 2.0 vs 4.3, p = 0.11 vs 0.006), with the following gLQ parameters: {alpha}/{beta} = 2.6-4.8 Gy, T{sub r} = 3.2-3.9 h for rat feet skin, and {alpha}/{beta} = 0.9 Gy, T{sub r} = 1.1 h for rat spinal cord. Conclusions: These results of repair process following a reciprocal time suggest that the generalized LQ model incorporating the reciprocal time of sublethal damage repair shows a better fit than the exponential repair model. These formulas can be used to analyze the experimental and clinical data, where a slowing-down repair process appears during the course of radiation therapy.

Huang, Zhibin; Mayr, Nina A.; Lo, Simon S.; Wang, Jian Z.; Jia Guang; Yuh, William T. C.; Johnke, Roberta [Department of Radiation Oncology, East Carolina University, Greenville, North Carolina 27834 (United States); Department of Radiation Oncology, Ohio State University, Columbus, Ohio 43210 (United States); Department of Radiation Oncology, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, Ohio 44106 (United States); Department of Radiation Oncology, Ohio State University, Columbus, Ohio 43210 (United States); Department of Radiology, Ohio State University, Columbus, Ohio 43210 (United States); Department of Radiation Oncology, East Carolina University, Greenville, North Carolina, 27834 (United States)

2012-01-15T23:59:59.000Z

9

General linear cameras : theory and applications  

E-Print Network (OSTI)

I present a General Linear Camera (GLC) model that unifies many previous camera models into a single representation. The GLC model describes all perspective (pinhole), orthographic, and many multiperspective (including ...

Yu, Jingyi, 1978-

2005-01-01T23:59:59.000Z

10

Computation of maximum likelihood estimates for multiresponse generalized linear mixed models with non-nested, correlated random effects  

Science Conference Proceedings (OSTI)

Estimation of generalized linear mixed models (GLMMs) with non-nested random effects structures requires the approximation of high-dimensional integrals. Many existing methods are tailored to the low-dimensional integrals produced by nested designs. ... Keywords: EM algorithm, Fully exponential Laplace approximation, Joint model, Multiple membership, Multivariate, Sparse matrix

Andrew T. Karl, Yan Yang, Sharon L. Lohr

2014-05-01T23:59:59.000Z

11

A general approach to heteroscedastic linear regression  

Science Conference Proceedings (OSTI)

Our article presents a general treatment of the linear regression model, in which the error distribution is modelled nonparametrically and the error variances may be heteroscedastic, thus eliminating the need to transform the dependent variable in many ... Keywords: Density estimation, Dirichlet process mixture, Heteroscedasticity, Model checking, Nonparametric regression, Variable selection

David S. Leslie; Robert Kohn; David J. Nott

2007-06-01T23:59:59.000Z

12

Anomaly General Circulation Models  

Science Conference Proceedings (OSTI)

Anomally models based on a spectral general circulation model (GCM) are formulated and applied to study of low-frequency atmospheric variability in the extratropics, and long-range forecasting research. A steady linear version of the anomaly ...

A. Navarra; K. Miyakoda

1988-05-01T23:59:59.000Z

13

The Response of a Linear Model of the Tropical Pacific to Surface Winds from the NCAR General Circulation Model  

Science Conference Proceedings (OSTI)

An experiment in which surface wind stress data from the National Center for Atmospheric Research global circulation model (GCM) was used to drive a simple model of the tropical Pacific is described. First, a 15-year integration of the GCM was ...

Nicholas E. Graham; Tim P. Barnett; Vijay G. Panchang; Ole M. Smedstad; James J. O'Brien; Robert M. Chervin

1989-09-01T23:59:59.000Z

14

Linear Solar Models  

E-Print Network (OSTI)

We present a new approach to study the properties of the sun. We consider small variations of the physical and chemical properties of the sun with respect to Standard Solar Model predictions and we linearize the structure equations to relate them to the properties of the solar plasma. By assuming that the (variation of) the present solar composition can be estimated from the (variation of) the nuclear reaction rates and elemental diffusion efficiency in the present sun, we obtain a linear system of ordinary differential equations which can be used to calculate the response of the sun to an arbitrary modification of the input parameters (opacity, cross sections, etc.). This new approach is intended to be a complement to the traditional methods for solar model calculation and allows to investigate in a more efficient and transparent way the role of parameters and assumptions in solar model construction. We verify that these Linear Solar Models recover the predictions of the traditional solar models with an high...

Villante, F L

2009-01-01T23:59:59.000Z

15

Piecewise Linear Modeling and Analysis  

Science Conference Proceedings (OSTI)

From the Publisher:Piecewise Linear Modeling and Analysis explains in detail all possible model descriptions to efficiently store piecewise linear functions starting with the Chua descriptions. Detailed explanation on how the model parameter can be obtained ...

Domine M. W. Leenaerts; Wim M. Van Bokhoven

1998-07-01T23:59:59.000Z

16

Piecewise Linear Modeling: Theory, Guidelines, and Applications  

E-Print Network (OSTI)

Statistical analysis underlies most published research in every scientific field of study. A common statistical tool for the analysis of cross-sectional data is the general linear model, or multiple regression. For the analysis of time series data, the most commonly employed tool is autoregressive integrated moving averages (ARIMA), which also is implicitly linear.

Kenneth O. Cogger

2006-01-01T23:59:59.000Z

17

One-loop Higgs boson production at the Linear Collider within the general two-Higgs-doublet model: e+e- versus gamma-gamma  

E-Print Network (OSTI)

We present an updated overview on the phenomenology of one-loop Higgs boson production at Linear Colliders within the general Two-Higgs-Doublet Model (2HDM). First we report on the Higgs boson pair production, and associated Higgs-Z boson production, at O(alpha^3_{ew}) from e+e- collisions. These channels furnish cross-sections in the range of 10-100 fb for Ecm=0.5 TeV and exhibit potentially large radiative corrections (of order 50%), whose origin can be traced back to the genuine enhancement capabilities of the triple Higgs boson self-interactions. Next we consider the loop-induced production of a single Higgs boson from direct gamma-gamma scattering. We single out sizable departures from the corresponding rates in the Standard Model, which are again correlated to trademark dynamical features of the 2HDM -- namely the balance of the non-standard Higgs/gauge, Higgs/fermion and Higgs self-interactions leading to sizable (destructive) interference effects. This pattern of quantum effects is unmatched in the MSSM, and could hence provide distinctive footprints of non-supersymmetric Higgs boson physics. Both calculations are revisited within a common, brought-to-date framework and include, in particular, the most stringent bounds from unitarity and flavor physics.

Joan Sola; David Lopez-Val

2011-07-07T23:59:59.000Z

18

Classification of linearly compact simple Jordan and generalized Poisson superalgebras  

E-Print Network (OSTI)

We classify all linearly compact simple Jordan superalgebras over an algebraically closed field of characteristic zero. As a corollary, we deduce the classification of all linearly compact unital simple generalized Poisson superalgebras.

Nicoletta Cantarini; Victor G. Kac; To Ernest; Borisovich Vinberg

2006-01-01T23:59:59.000Z

19

Generalized multicarrier CDMA: unification and linear equalization  

Science Conference Proceedings (OSTI)

Relying on block-symbol spreading and judicious design of user codes, this paper builds on the generalized multicarrier (GMC) quasisynchronous CDMA system that is capable of multiuser interference (MUI) elimination and intersymbol interference (ISI) ... Keywords: blind equalization, multicarrier CDMA, multipath fading channels

Georgios B. Giannakis; Paul A. Anghel; Zhengdao Wang

2005-01-01T23:59:59.000Z

20

Robust likelihood inference for regression parameters in partially linear models  

Science Conference Proceedings (OSTI)

A robust likelihood approach is proposed for inference about regression parameters in partially-linear models. More specifically, normality is adopted as the working model and is properly corrected to accomplish the objective. Knowledge about the true ... Keywords: Generalized additive models, Partially-linear models, Robust likelihood

Chung-Wei Shen; Tsung-Shan Tsou; N. Balakrishnan

2011-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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

Ocean General Circulation Models  

SciTech Connect

1. Definition of Subject The purpose of this text is to provide an introduction to aspects of oceanic general circulation models (OGCMs), an important component of Climate System or Earth System Model (ESM). The role of the ocean in ESMs is described in Chapter XX (EDITOR: PLEASE FIND THE COUPLED CLIMATE or EARTH SYSTEM MODELING CHAPTERS). The emerging need for understanding the Earth’s climate system and especially projecting its future evolution has encouraged scientists to explore the dynamical, physical, and biogeochemical processes in the ocean. Understanding the role of these processes in the climate system is an interesting and challenging scientific subject. For example, a research question how much extra heat or CO2 generated by anthropogenic activities can be stored in the deep ocean is not only scientifically interesting but also important in projecting future climate of the earth. Thus, OGCMs have been developed and applied to investigate the various oceanic processes and their role in the climate system.

Yoon, Jin-Ho; Ma, Po-Lun

2012-09-30T23:59:59.000Z

22

On linear models for nonlinear systems  

Science Conference Proceedings (OSTI)

Best linear time-invariant (LTI) approximations are analysed for several interesting classes of discrete nonlinear time-invariant systems. These include nonlinear finite impulse response systems and a class of nonsmooth systems called bi-gain systems. ... Keywords: Approximation, Discrete-time systems, Fréchet derivative, Linear models, Nonlinear systems, System identification, Wiener systems

P. M. MäKilä; J. R. Partington

2003-01-01T23:59:59.000Z

23

The generalized HSS method for solving singular linear systems  

Science Conference Proceedings (OSTI)

For the singular, non-Hermitian, and positive semidefinite linear systems, we propose an alternating-direction iterative method with two parameters based on the Hermitian and skew-Hermitian splitting. The semi-convergence analysis and the quasi-optimal ... Keywords: Hermitian and skew-Hermitian splitting, Iterative method, Non-Hermitian matrix, Positive semidefinite matrix, Semi-convergence, Singular linear system

Wen Li; Yang-Peng Liu; Xiao-Fei Peng

2012-03-01T23:59:59.000Z

24

Point and Interval Forecasting of Spot Electricity Prices: Linear vs. Non-Linear Time Series Models  

E-Print Network (OSTI)

In this paper we assess the short-term forecasting power of different time series models in the electricity spot market. In particular we calibrate AR/ARX (”X” stands for exogenous/fundamental variable — system load in our study), AR/ARX-GARCH, TAR/TARX and Markov regime-switching models to California Power Exchange (CalPX) system spot prices. We then use them for out-ofsample point and interval forecasting in normal and extremely volatile periods preceding the market crash in winter 2000/2001. We find evidence that (i) non-linear, threshold regime-switching (TAR/TARX) models outperform their linear counterparts, both in point and interval forecasting, and that (ii) an additional GARCH component generally decreases point forecasting efficiency. Interestingly, the former result challenges a number of previously published studies on the failure of non-linear regime-switching models in forecasting.

Adam Misiorek; Stefan Trueck; Rafal Weron

2006-01-01T23:59:59.000Z

25

Piecewise linear car-following modeling  

E-Print Network (OSTI)

We present a traffic model which extends the linear car-following model as well as the min-plus traffic model (a model based on the min-plus algebra). A discrete-time car-dynamics describing the traffic on a 1-lane road without passing is interpreted as a dynamic programming equation of a stochastic optimal control problem of a Markov chain. This variational formulation permits to characterize the stability of the car-dynamics and to calculte the stationary regimes when they exist. The model is based on a piecewise linear approximation of the fundamental traffic diagram.

Farhi, Nadir

2011-01-01T23:59:59.000Z

26

Empirical Stochastic Models for the Dominant Climate Statistics of a General Circulation Model  

Science Conference Proceedings (OSTI)

Two Markov models with different dynamics and forcing are used to model the transient eddy statistics of an idealized general circulation model (GCM). The first Markov model employs a physically based dynamical operator composed of the linearized ...

Timothy DelSole; Arthur Y. Hou

1999-10-01T23:59:59.000Z

27

Estimates in the Generalized Morrey Space for Linear Parabolic Systems.  

E-Print Network (OSTI)

??The purpose of the this paper is to study the parabolic system uti - D_?(aij??D_?uj) = -div fi in the generalized Morrey Space L_?2,? .… (more)

McBride, Matthew Scott

2007-01-01T23:59:59.000Z

28

Optimal aggregation of linear time series models  

Science Conference Proceedings (OSTI)

Aggregation is a central and mainly unsolved problem in econometrics. When considering linear time series models, a widely used method is to replace the disaggregate model by an aggregative one in which the variables are grouped and replaced by sums ... Keywords: Aggregation, Industrial classification, Threshold accepting

J. Chipman; P. Winker

2005-04-01T23:59:59.000Z

29

Computable General Equilibrium Models for Sustainability Impact...  

Open Energy Info (EERE)

Computable General Equilibrium Models for Sustainability Impact Assessment: Status quo and prospects Jump to: navigation, search Name Computable General Equilibrium Models for...

30

Fair SMG and Linear Time Model Checking  

E-Print Network (OSTI)

SMG is a system designed to generate a finite state model of a program from the program itself and an operational semantics for the programming language. This finite state model can then be model-checked to verify desired temporal properties of the original program. In this paper we first show how we have incorporated notions of fairness into SMG; in particular, a user is now able to define semantics with "fair" constructs, for example, parallel, repetitive choice, etc. The user can, indeed, mix different forms of fairness checking. Secondly we describe a practical approach to model checking of linear temporal formulae over the fair structures generated by SMG. Our approach is a refinement and extension of the fair-satisfiability algorithms, presented earlier by Lichtenstein and Pnueli, together with techniques developed in our practical implementations of decision procedures for linear temporal logic.

Howard Barringer; Michael D. Fisher; Graham D. Gough

1989-01-01T23:59:59.000Z

31

Linear and Nonlinear Diagnostic Models of Stationary Eddies in the Upper Troposphere during Northern Summer  

Science Conference Proceedings (OSTI)

The upper tropospheric circulation during northern summer produced by a general circulation model (GCM) is studied using linear and nonlinear barotropic models and by analysing a streamfunction budget. The model experiments and the budget ...

In-Sik Kang; Isaac M. Held

1986-12-01T23:59:59.000Z

32

Transformation between radial generalized Higgs model and generalized CRS model with application to quasi-exactly solvable generalized Higgs model  

E-Print Network (OSTI)

In this paper, we present a coordinate transformation between the generalized Carinena-Ranada-Santander model and the radial generalized Higgs model. Furthermore, based on this transformation, we obtain a series of quasi-exactly solvable potential of the two-dimensional generalized Higgs model.

Ci Song; Yan Li; Jing-Ling Chen

2013-09-23T23:59:59.000Z

33

Generalization of Lambert's reflectance model  

Science Conference Proceedings (OSTI)

Lambert's model for body reflection is widely used in computer graphics. It is used extensively by rendering techniques such as radiosity and ray tracing. For several real-world objects, however, Lambert's model can prove to be a very inaccurate approximation ... Keywords: BRDF, Lambert's model, moon reflectance, reflection models, rough surfaces

Michael Oren; Shree K. Nayar

1994-07-01T23:59:59.000Z

34

N = (2, 2) Non-Linear sigma-Models: A Synopsis  

E-Print Network (OSTI)

We review N=(2,2) supersymmetric non-linear sigma-models in two dimensions and their relation to generalized Kahler and Calabi-Yau geometry. We illustrate this with an explicit non-trivial example.

Alexander Sevrin; Daniel C. Thompson

2013-05-21T23:59:59.000Z

35

Linearized Functional Minimization for Inverse Modeling  

SciTech Connect

Heterogeneous aquifers typically consist of multiple lithofacies, whose spatial arrangement significantly affects flow and transport. The estimation of these lithofacies is complicated by the scarcity of data and by the lack of a clear correlation between identifiable geologic indicators and attributes. We introduce a new inverse-modeling approach to estimate both the spatial extent of hydrofacies and their properties from sparse measurements of hydraulic conductivity and hydraulic head. Our approach is to minimize a functional defined on the vectors of values of hydraulic conductivity and hydraulic head fields defined on regular grids at a user-determined resolution. This functional is constructed to (i) enforce the relationship between conductivity and heads provided by the groundwater flow equation, (ii) penalize deviations of the reconstructed fields from measurements where they are available, and (iii) penalize reconstructed fields that are not piece-wise smooth. We develop an iterative solver for this functional that exploits a local linearization of the mapping from conductivity to head. This approach provides a computationally efficient algorithm that rapidly converges to a solution. A series of numerical experiments demonstrates the robustness of our approach.

Wohlberg, Brendt [Los Alamos National Laboratory; Tartakovsky, Daniel M. [University of California, San Diego; Dentz, Marco [Institute of Environmental Assessment and Water Research, Barcelona, Spain

2012-06-21T23:59:59.000Z

36

Goodness-of-fit tests in semi-linear models  

Science Conference Proceedings (OSTI)

Specification tests for the error distribution are proposed in semi-linear models, including the partial linear model and additive models. The tests utilize an integrated distance involving the empirical characteristic function of properly estimated ... Keywords: Bootstrap test, Empirical characteristic function, Goodness-of-fit test, Semiparametric model, Symmetry test

Simos G. Meintanis; Jochen Einbeck

2012-07-01T23:59:59.000Z

37

Snow Hydrology in a General Circulation Model  

Science Conference Proceedings (OSTI)

A snow hydrology has been implemented in an atmospheric general circulation model (GCM). The snow hydrology consists of parameterizations of snowfall and snow cover fraction, a prognostic calculation of snow temperature, and a model of the snow ...

Susan Marshall; John O. Roads; Gary Glatzmaier

1994-08-01T23:59:59.000Z

38

New classical r-matrices from integrable non-linear sigma models  

E-Print Network (OSTI)

Non linear sigma models on Riemannian symmetric spaces constitute the most general class of classical non-linear sigma models which are known to be integrable. Using the current algebra structure of these models their canonical structure is analysed and it is shown that their non ultralocal fundamental Poisson bracket relation is governed by a field dependent non antisymmetric r-matrix obeying a dynamical Yang Baxter equation. Contribution presented at the XIX ICGTMP Salamanca June 92

Laartz, J; Forger, M; Schäper, U

1992-01-01T23:59:59.000Z

39

Fitting a Linear Autoregressive Model for Long-Range Forecasting  

Science Conference Proceedings (OSTI)

Methods of fitting a linear autoregressive model to a stationary time series are summarized. Parameters of the linear autoregressive model were estimated by the Durbin stepwise procedure and the order of this model was chosen by means of a t-test ...

C. S. Yao

1983-04-01T23:59:59.000Z

40

Testing for causal e ffects in a generalized regression model with endogenous regressors  

E-Print Network (OSTI)

A unifying framework to test for causal effects in nonlinear models is proposed. We consider a generalized linear-index regression model with endogenous regressors and no parametric assumptions on the error disturbances. ...

Abrevaya, Jason

Note: This page contains sample records for the topic "general linear model" 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

Convective Interaction with Dynamics in a Linear Primitive Equation Model  

Science Conference Proceedings (OSTI)

A new global atmosphere model purpose designed for climate studies is introduced. The model is solved in terms of the normal modes of the linearized primitive equations on a sphere, which allows use of long time steps without introducing ...

Richard Seager; Stephen E. Zebiak

1994-05-01T23:59:59.000Z

42

A Linearized Convective Overturning Model for Prediction of Thunderstorm Movement  

Science Conference Proceedings (OSTI)

A linearized model of convective overturning in shear for prediction of storm propagation is presented. Good correspondence between the model and observation is found for a number of case studies of real storms. Supercell storms, however, are an ...

Adrian Marroquin; David J. Raymond

1982-01-01T23:59:59.000Z

43

Linear Spectral Numerical Model for Internal Gravity Wave Propagation  

Science Conference Proceedings (OSTI)

A three-dimensional linear spectral numerical model is proposed to simulate the propagation of internal gravity wave fluctuations in a stably stratified atmosphere. The model is developed to get first-order estimations of gravity wave ...

J. Marty; F. Dalaudier

2010-05-01T23:59:59.000Z

44

Modeling International Relationships in Applied General Equilibrium  

Open Energy Info (EERE)

Modeling International Relationships in Applied General Equilibrium Modeling International Relationships in Applied General Equilibrium (MIRAGE) Jump to: navigation, search LEDSGP green logo.png FIND MORE DIA TOOLS This tool is part of the Development Impacts Assessment (DIA) Toolkit from the LEDS Global Partnership. Tool Summary LAUNCH TOOL Name: Modeling International Relationships in Applied General Equilibrium (MIRAGE) Agency/Company /Organization: International Food Policy Research Institute, Centre d'Etudes Prospectives et d'Informations Internationales (CEPII) Focus Area: Economic Development Topics: Co-benefits assessment, - Macroeconomic Resource Type: Software/modeling tools User Interface: Desktop Application Complexity/Ease of Use: Moderate Website: www.ifpri.org/book-5076/ourwork/program/mirage-model RelatedTo: Global Trade Analysis Project (GTAP) Data Base

45

Multi-scale Modelling Applied to Non Linear Constitutive Equations  

Science Conference Proceedings (OSTI)

A Continuum General Noise Brownian Thermostat with Applications to Film Morphology · A Multiscale, Nonlinear, Modeling Framework Enabling the Design and ...

46

Predictability of Linear Coupled Systems. Part II: An Application to a Simple Model of Tropical Atlantic Variability  

Science Conference Proceedings (OSTI)

A predictability analysis developed within a general framework of linear stochastic dynamics in a companion paper is applied to a simple coupled climate model of tropical Atlantic variability (TAV). The simple model extends the univariate ...

Ping Chang; R. Saravanan; Faming Wang; Link Ji

2004-04-01T23:59:59.000Z

47

Modeling Global Lightning Distributions in a General Circulation Model  

Science Conference Proceedings (OSTI)

A general circulation model (GCM) is used to model global lightning distributions and frequencies. Both total and cloud-to-ground lightning frequencies are modeled using parameterizations that relate the depth of convective clouds to lightning ...

Colin Price; David Rind

1994-08-01T23:59:59.000Z

48

Modeling Linear Kinematic Features in Sea Ice  

Science Conference Proceedings (OSTI)

Sea ice deformation is localized in narrow zones of high strain rate that extend hundreds of kilometers, for example, across the Arctic Basin. This paper demonstrates that these failure zones may be modeled with a viscous–plastic sea ice model, ...

Jennifer K. Hutchings; Petra Heil; William D. Hibler III

2005-12-01T23:59:59.000Z

49

Linear Models: Useful Tools to Analyze GCM Results  

Science Conference Proceedings (OSTI)

Using a two-level linear, steady state model, we diagnose the 40-day mean response of a GCM to a tropical sea surface temperature (SST) anomaly. The time-mean anomalies produced by the GCM are simulated as linear response to the anomalous ...

C. J. Kok; J. D. Opsteegh; H. M. van den Dool

1987-09-01T23:59:59.000Z

50

A Linear Stochastic Dynamical Model of ENSO. Part II: Analysis  

Science Conference Proceedings (OSTI)

In this study the behavior of a linear, intermediate model of ENSO is examined under stochastic forcing. The model was developed in a companion paper (Part I) and is derived from the Zebiak–Cane ENSO model. Four variants of the model are used ...

C. J. Thompson; D. S. Battisti

2001-02-01T23:59:59.000Z

51

On generalized P\\'olya urn models  

E-Print Network (OSTI)

We study an urn model introduced in the paper of Chen and Wei, where at each discrete time step $m$ balls are drawn at random from the urn containing colors white and black. Balls are added to the urn according to the inspected colors, generalizing the well known P\\'olya-Eggenberger urn model, case m=1. We provide exact expressions for the expectation and the variance of the number of white balls after n draws, and determine the structure of higher moments. Moreover, we discuss extensions to more than two colors. Furthermore, we introduce and discuss a new urn model where the sampling of the m balls is carried out in a step-by-step fashion, and also introduce a generalized Friedman's urn model.

Chen, May-Ru

2011-01-01T23:59:59.000Z

52

Forecasting Pacific SSTs: Linear Inverse Model Predictions of the PDO  

Science Conference Proceedings (OSTI)

A linear inverse model (LIM) is used to predict Pacific (30°S–60°N) sea surface temperature anomalies (SSTAs), including the Pacific decadal oscillation (PDO). The LIM is derived from the observed simultaneous and lagged covariance statistics of ...

Michael A. Alexander; Ludmila Matrosova; Cécile Penland; James D. Scott; Ping Chang

2008-01-01T23:59:59.000Z

53

A Linear Markov Model for East Asian Monsoon Seasonal Forecast  

Science Conference Proceedings (OSTI)

A linear Markov model has been developed to predict the short-term climate variability of the East Asian monsoon system, with emphasis on precipitation variability. Precipitation, sea level pressure, zonal and meridional winds at 850 mb, along ...

Qiaoyan Wu; Ying Yan; Dake Chen

2013-07-01T23:59:59.000Z

54

Robust mixture linear EIV regression models by t-distribution.  

E-Print Network (OSTI)

??A robust estimation procedure for mixture errors-in-variables linear regression models is proposed in the report by assuming the error terms follow a t-distribution. The estimation… (more)

Liu, Yantong

2012-01-01T23:59:59.000Z

55

Money Exchange Model and a general Outlook  

E-Print Network (OSTI)

The Kinetic Gas Theory like two-agent money exchange models, recently introduced in the Econophysics of Wealth distributions, are revisited. The emergence of Boltzmann-Gibbs like distribution of individual money to Pareto's law in the tail of the distribution is examined in terms of 2x2 Transition matrix with a general and simple oulook. Some additional interesting results are also reported.

Gupta, A K

2005-01-01T23:59:59.000Z

56

Characteristics of identifying linear dynamic models from impulse response data using Prony analysis  

SciTech Connect

The purpose of the study was to investigate the characteristics of fitting linear dynamic models to the impulse response of oscillatory dynamic systems using Prony analysis. Many dynamic systems exhibit oscillatory responses with multiple modes of oscillations. Although the underlying dynamics of such systems are often nonlinear, it is frequently possible and very useful to represent the system operating about some set point with a linear model. Derivation of such linear models can be done using two basic approaches: model the system using theoretical derivations and some linearization method such as a Taylor series expansion; or use a curve-fitting technique to optimally fit a linear model to specified system response data. Prony analysis belongs to the second class of system modeling because it is a method of fitting a linear model to the impulse response of a dynamic system. Its parallel formulation inherently makes it well suited for fitting models to oscillatory system data. Such oscillatory dynamic effects occur in large synchronous-generator-based power systems in the form of electromechanical oscillations. To study and characterize these oscillatory dynamics, BPA has developed computer codes to analyze system data using Prony analysis. The objective of this study was to develop a highly detailed understanding of the properties of using Prony analysis to fit models to systems with characteristics often encountered in power systems. This understanding was then extended to develop general rules-of-thumb'' for using Prony analysis. The general characteristics were investigated by performing fits to data from known linear models under controlled conditions. The conditions studied include various mathematical solution techniques; different parent system configurations; and a large variety of underlying noise characteristics.

Trudnowski, D.J.

1992-12-01T23:59:59.000Z

57

Characteristics of identifying linear dynamic models from impulse response data using Prony analysis  

SciTech Connect

The purpose of the study was to investigate the characteristics of fitting linear dynamic models to the impulse response of oscillatory dynamic systems using Prony analysis. Many dynamic systems exhibit oscillatory responses with multiple modes of oscillations. Although the underlying dynamics of such systems are often nonlinear, it is frequently possible and very useful to represent the system operating about some set point with a linear model. Derivation of such linear models can be done using two basic approaches: model the system using theoretical derivations and some linearization method such as a Taylor series expansion; or use a curve-fitting technique to optimally fit a linear model to specified system response data. Prony analysis belongs to the second class of system modeling because it is a method of fitting a linear model to the impulse response of a dynamic system. Its parallel formulation inherently makes it well suited for fitting models to oscillatory system data. Such oscillatory dynamic effects occur in large synchronous-generator-based power systems in the form of electromechanical oscillations. To study and characterize these oscillatory dynamics, BPA has developed computer codes to analyze system data using Prony analysis. The objective of this study was to develop a highly detailed understanding of the properties of using Prony analysis to fit models to systems with characteristics often encountered in power systems. This understanding was then extended to develop general ``rules-of-thumb`` for using Prony analysis. The general characteristics were investigated by performing fits to data from known linear models under controlled conditions. The conditions studied include various mathematical solution techniques; different parent system configurations; and a large variety of underlying noise characteristics.

Trudnowski, D.J.

1992-12-01T23:59:59.000Z

58

A Generalized Streaming Model for Concurrent Computing  

E-Print Network (OSTI)

Multicore parallel programming has some very difficult problems such as deadlocks during synchronizations and race conditions brought by concurrency. Added to the difficulty is the lack of a simple, well-accepted computing model for multicore architectures--because of that it is hard to develop powerful programming environments and debugging tools. To tackle the challenges, we promote a generalized stream computing model, inspired by previous researches on stream computing, that unifies parallelization strategies for programming language design, compiler design and operating system design. Our model provides a high-level abstraction in designing language constructs to convey concepts of concurrent operations, in organizing a program's runtime layout for parallel execution, and in scheduling concurrent instruction blocks through runtime and/or operating systems. In this paper, we give a high-level description of the proposed model: we define the foundation of the model, show its simplicity through algebraic/co...

Wang, Yibing

2010-01-01T23:59:59.000Z

59

Fractional models for modeling complex linear systems under poor frequency resolution measurements  

Science Conference Proceedings (OSTI)

When modeling a linear system in a parametric way, one needs to deal with (i) model structure selection, (ii) model order selection as well as (iii) an accurate fit of the model. The most popular model structure for linear systems has a rational form ... Keywords: Continuous-time modeling, Fractional order systems, Linear systems, Non-asymptotic, Nonlinear least squares, Parametric models, Poor frequency resolutions, Statistical signal processing, Transfer function

Kurt Barbé, Oscar J. Olarte Rodriguez, Wendy Van Moer, Lieve Lauwers

2013-07-01T23:59:59.000Z

60

Convective Entrainment into a Shear-Free, Linearly Stratified Atmosphere: Bulk Models Reevaluated through Large Eddy Simulations  

Science Conference Proceedings (OSTI)

Relationships between parameters of convective entrainment into a shear-free, linearly stratified atmosphere predicted by the zero-order jump and general-structure bulk models of entrainment are reexamined using data from large eddy simulations (...

Evgeni Fedorovich; Robert Conzemius; Dmitrii Mironov

2004-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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

Confirming the Lanchestrian linear-logarithmic model of attrition  

Science Conference Proceedings (OSTI)

This paper is the fourth in a series of reports on the breakthrough research in historical validation of attrition in conflict. Significant defense policy decisions, including weapons acquisition and arms reduction, are based in part on models of conflict. Most of these models are driven by their attrition algorithms, usually forms of the Lanchester square and linear laws. None of these algorithms have been validated. The results of this paper confirm the results of earlier papers, using a large database of historical results. The homogeneous linear-logarithmic Lanchestrian attrition model is validated to the extent possible with current initial and final force size data and is consistent with the Iwo Jima data. A particular differential linear-logarithmic model is described that fits the data very well. A version of Helmbold's victory predicting parameter is also confirmed, with an associated probability function. 37 refs., 73 figs., 68 tabs.

Hartley, D.S. III.

1990-12-01T23:59:59.000Z

62

Parametric investigations for extrapolation of a log-linear creep model  

Science Conference Proceedings (OSTI)

The mathematical modelling of certain nonlinear physical phenomena has traditionally been expedited by transforming an equation of the general form y=a+bx^n to a linear one by logarithms and solving for the parameters by graphical techniques or least-squares ...

S. H. Foust; K. P. Chong

1988-02-01T23:59:59.000Z

63

Assessing the reliability of linear dynamic transformer thermal modelling  

E-Print Network (OSTI)

Assessing the reliability of linear dynamic transformer thermal modelling X. Mao, D.J. Tylavsky and G.A. McCulla Abstract: Improving the utilisation of transformers requires that the hot-spot and top. An alternative method for assessing transformer model reliability is provided. 1 Introduction The maximally

64

Hybrid Linear Modeling via Local Best-Fit Flats  

Science Conference Proceedings (OSTI)

We present a simple and fast geometric method for modeling data by a union of affine subspaces. The method begins by forming a collection of local best-fit affine subspaces, i.e., subspaces approximating the data in local neighborhoods. The correct sizes ... Keywords: Face clustering, High-dimensional data, Hybrid linear modeling, Local PCA, Motion segmentation, Spectral clustering, Subspace clustering

Teng Zhang; Arthur Szlam; Yi Wang; Gilad Lerman

2012-12-01T23:59:59.000Z

65

Forecast Combinations of Computational Intelligence and Linear Models for the  

E-Print Network (OSTI)

Forecast Combinations of Computational Intelligence and Linear Models for the NN5 Time Series Forecasting competition Robert R. Andrawis Dept Computer Engineering Cairo University, Giza, Egypt robertrezk@eg.ibm.com November 6, 2010 Abstract In this work we introduce a forecasting model with which we participated

Atiya, Amir

66

PICASSO: A GENERAL INTERACTIVE GRAPHICS MODELING PROGRAM.  

DOE Green Energy (OSTI)

This report is intended to serve as a user's manual for PICASSO. The detailed description of the concepts involved and the methods used in implementing those concepts will be treated in a subsequent paper and are incorporated in the Ph.D. thesis of one of the authors. The program evolved from earlier work on a graphics program for printed circuit board design which had a fixed library of elements. The need for a dynamic graphics program (i.e., one which allows the creation of new elements as required) soon became obvious, and the generality of such a program for mathematical modeling was a major factor in the development of PICASSO. It was thought that the present stage of development of this modeling program had reached a point that a report such as this would be useful in creating a broader interest in the field. However, work continues to further generalize the program into such areas as computer animation, 3-D display and modeling, and a more general interface to available ''analysis'' routines, such as the available compilers and interpreters. It should be emphasized that the program is continually changing as new ideas and applications arise. For example, in order to create a modeling system which is complete in some sense, PICASSO was designed explicitly to interface with the CDC analysis program MIMIC. The next step, already under investigation, is to allow for user-defined output templates to specify,the form of the output of a model. This feature, along with the capability for multiple definitions of an element, will allow for several types of analysis to be done on a single model. Another innovation being studied is the provision for ''robot'' commands, with which the user may define a sequence of. commands to be carried out on demand, in much the same way as mechanical ''robots'' are programmed. For this reason there will usually be several versions of PICASSO available, one of which is relatively ''bug-free''. The authors wish to gratefully acknowledge support from the Math and. Computing Division and the Electrical Engineering Department of the Lawrence Berkeley Laboratory, and the Department of Electrical Engineering and Computer Science of the University of California, Berkeley. Specifically, we wish to thank Ivan Wood and Horace Warnock of EE Drafting for support and many suggestions; Michiyuki Nakamura, Richard LaPierre, John Mendes, Don Evans and Frank Neu of EE Research and Development for many suggestions and interesting applications; Professor Baskin, EECS Department, UCB, James Baker and Carl Quong, Math and Computing, LBL for support and encouragement; and Norma Hart for preparing the manuscript.

Austin, D.M.; Holmes, H.H.

1972-01-01T23:59:59.000Z

67

Exact Solutions to Kawase's Linear Model of Deep Ocean Circulation  

Science Conference Proceedings (OSTI)

Exact solutions are found for Kawase's linear, two-layer model of mass-driven deep-ocean circulation. It is demonstrated that for strong damping, even though the deep western boundary current (DWBC) bifurcates at the equator as found in Kawase's ...

Dailin Wang; Dennis W. Moore; Lewis M. Rothstein

1994-10-01T23:59:59.000Z

68

Multi-Anticipative Piecewise-Linear Car-Following Model  

E-Print Network (OSTI)

We propose in this article an extension of the piecewise linear car-following model to multi-anticipative driving. As in the one-car-anticipative model, the stability and the stationary regimes are characterized thanks to a variational formulation of the car-dynamics. We study the homogeneous driving case. We show that in term of the stationary regime, the multi-anticipative model guarantees the same macroscopic behavior as for the one-car-anticipative one. Nevertheless, in the transient traffic, the variance in car-velocities and accelerations is mitigated by the multi-anticipative driving, and the car-trajectories are smoothed. A parameter identification of the model is made basing on NGSIM data and using a piecewise linear regression approach.

Nadir Farhi; Habib Haj-Salem; Jean-Patrick Lebacque

2013-02-01T23:59:59.000Z

69

Linear lattice modeling of the recycler ring at Fermilab  

SciTech Connect

Substantial differences are found in tunes and beta functions between the existing linear model and the real storage ring. They result in difficulties when tuning the machine to new lattice conditions. We are trying to correct the errors by matching the model into the real machine using Orbit Response Matrix (ORM) Fit method. The challenges with ORM particularly in the Recycler ring and the results are presented in this paper.

Xiao, Meiqin; Valishev, Alexander; Nagaslaev, Vladimir P.; /Fermilab; Sajaev, Vadim; /Argonne

2006-06-01T23:59:59.000Z

70

PICASSO: A GENERAL INTERACTIVE GRAPHICS MODELING PROGRAM.  

SciTech Connect

This report is intended to serve as a user's manual for PICASSO. The detailed description of the concepts involved and the methods used in implementing those concepts will be treated in a subsequent paper and are incorporated in the Ph.D. thesis of one of the authors. The program evolved from earlier work on a graphics program for printed circuit board design which had a fixed library of elements. The need for a dynamic graphics program (i.e., one which allows the creation of new elements as required) soon became obvious, and the generality of such a program for mathematical modeling was a major factor in the development of PICASSO. It was thought that the present stage of development of this modeling program had reached a point that a report such as this would be useful in creating a broader interest in the field. However, work continues to further generalize the program into such areas as computer animation, 3-D display and modeling, and a more general interface to available ''analysis'' routines, such as the available compilers and interpreters. It should be emphasized that the program is continually changing as new ideas and applications arise. For example, in order to create a modeling system which is complete in some sense, PICASSO was designed explicitly to interface with the CDC analysis program MIMIC. The next step, already under investigation, is to allow for user-defined output templates to specify,the form of the output of a model. This feature, along with the capability for multiple definitions of an element, will allow for several types of analysis to be done on a single model. Another innovation being studied is the provision for ''robot'' commands, with which the user may define a sequence of. commands to be carried out on demand, in much the same way as mechanical ''robots'' are programmed. For this reason there will usually be several versions of PICASSO available, one of which is relatively ''bug-free''. The authors wish to gratefully acknowledge support from the Math and. Computing Division and the Electrical Engineering Department of the Lawrence Berkeley Laboratory, and the Department of Electrical Engineering and Computer Science of the University of California, Berkeley. Specifically, we wish to thank Ivan Wood and Horace Warnock of EE Drafting for support and many suggestions; Michiyuki Nakamura, Richard LaPierre, John Mendes, Don Evans and Frank Neu of EE Research and Development for many suggestions and interesting applications; Professor Baskin, EECS Department, UCB, James Baker and Carl Quong, Math and Computing, LBL for support and encouragement; and Norma Hart for preparing the manuscript.

Austin, D.M.; Holmes, H.H.

1972-01-01T23:59:59.000Z

71

NEW MODEL FOR NUCLEON GENERALIZED PARTON DISTRIBUTIONS  

SciTech Connect

We describe a new type of models for nucleon generalized parton distributions (GPDs) H and E. They are heavily based on the fact nucleon GPDs require to use two forms of double distribution (DD) representations. The outcome of the new treatment is that the usual "DD+D-term" construction should be amended by an extra term, \\xi E_+^1 (x,\\xi) which has the DD structure \\alpha/\\beta e(\\beta,\\alpha), with e(\\beta,\\alpha) being the DD that generates GPD E(x,\\xi). We found that this function, unlike the D-term, has support in the whole -1 < x <1 region. Furthermore, it does not vanish at the border points |x|=\\xi.

Radyushkin, Anatoly V. [JLAB

2014-01-01T23:59:59.000Z

72

Full length article: A generalization of the Riesz-Fischer theorem and linear summability methods  

Science Conference Proceedings (OSTI)

We extend the classical Riesz-Fischer theorem to biorthogonal systems of functions in Orlicz spaces: from a given double series (not necessarily convergent but satisfying a growth condition) we construct a function (in a given Orlicz space) by a linear ... Keywords: Biorthogonal systems, Expansions of functions, Linear summability methods, Orlicz spaces

B. Brive; C. Finet; G. E. Tkebuchava

2012-06-01T23:59:59.000Z

73

NON-LINEAR MODELING OF THE RHIC INTERACTION REGIONS.  

Science Conference Proceedings (OSTI)

For RHIC's collision lattices the dominant sources of transverse non-linearities are located in the interaction regions. The field quality is available for most of the magnets in the interaction regions from the magnetic measurements, or from extrapolations of these measurements. We discuss the implementation of these measurements in the MADX models of the Blue and the Yellow rings and their impact on beam stability.

TOMAS,R.FISCHER,W.JAIN,A.LUO,Y.PILAT,F.

2004-07-05T23:59:59.000Z

74

A Comparison of Baroclinic Instability with the Time Variations of Kinetic Energy in a General Circulation Model  

Science Conference Proceedings (OSTI)

The flow generated by a general circulation model is zonally averaged at 1-day intervals, and, for each of the axisymmetric flows obtained, the linear growth-rate spectrum for baroclinic waves is computed using a linear model. The time sequence ...

Robert Walko; Robert Gall

1980-08-01T23:59:59.000Z

75

Computable General Equilibrium Models for Sustainability Impact Assessment:  

Open Energy Info (EERE)

Computable General Equilibrium Models for Sustainability Impact Assessment: Computable General Equilibrium Models for Sustainability Impact Assessment: Status quo and prospects Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Computable General Equilibrium Models for Sustainability Impact Assessment: Status quo and prospects Agency/Company /Organization: DG Joint Research Centre, European Commission, University of Heidelberg Topics: Co-benefits assessment Resource Type: Guide/manual, Publications, Software/modeling tools User Interface: Other Website: iatools.jrc.ec.europa.eu/docs/ecol_econ_2006.pdf Computable General Equilibrium Models for Sustainability Impact Assessment: Status quo and prospects Screenshot References: Computable general equilibrium models[1] Abstract "Sustainability Impact Assessment (SIA) of economic, environmental, and

76

Model generalization and its implications on intrusion detection  

Science Conference Proceedings (OSTI)

To make up for the incompleteness of the known behaviors of a computing resource, model generalization is utilized to infer more behaviors in the behavior model besides the known behaviors. In principle, model generalization can improve the detection ... Keywords: generalization, intrusion, intrusion detection, machine learning, security, security infrastructure

Zhuowei Li; Amitabha Das; Jianying Zhou

2005-06-01T23:59:59.000Z

77

The Response of an Ocean General Circulation Model to Surface Wind Stress Produced by an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

Two surface wind stress datasets for 1979–91, one based on observations and the other from an integration of the COLA atmospheric general circulation model (AGCM) with prescribed SST, are used to drive the GFDL ocean general circulation model. ...

Bohua Huang; Edwin K. Schneider

1995-10-01T23:59:59.000Z

78

Development of a Toolkit for Calculating Linear, Change-Point Linear and Multiple-Linear Inverse Building Energy Analysis Models, ASHRAE Research Project 1050-RP, Final Report  

E-Print Network (OSTI)

This report summarizes the results of ASHRAE Research Project 1050: Development of a Toolkit for Calculating Linear, Change-Point Linear and Multiple Linear Inverse Building Energy Analysis Models. The Inverse Modeling Toolkit (WIT) is a FORTRAN 90 application for developing regression models of building energy use. IMT can identify single and multi-variable least-squares regression models. It can also identify variable-base degree-day and single and multi-variable change-point models, which have been shown to be especially useful for modeling building energy use. This report includes background information about IMT and the models, instructions for its installation and operation, and the results of accuracy and robustness testing.

Kissock, J. K.; Haberl, J. S.; Claridge, D. E.

2002-11-01T23:59:59.000Z

79

Source of Gravity Waves within a Vortex-Dipole Jet Revealed by a Linear Model  

Science Conference Proceedings (OSTI)

This study develops a linear numerical model to address the source mechanism of the gravity waves generated within a vortex dipole simulated in a fully nonlinear nonhydrostatic mesoscale model. The background flow for this linear model is ...

Shuguang Wang; Fuqing Zhang

2010-05-01T23:59:59.000Z

80

Application of Improved Radiation Modeling to General Circulation Models  

SciTech Connect

This research has accomplished its primary objectives of developing accurate and efficient radiation codes, validating them with measurements and higher resolution models, and providing these advancements to the global modeling community to enhance the treatment of cloud and radiative processes in weather and climate prediction models. A critical component of this research has been the development of the longwave and shortwave broadband radiative transfer code for general circulation model (GCM) applications, RRTMG, which is based on the single-column reference code, RRTM, also developed at AER. RRTMG is a rigorously tested radiation model that retains a considerable level of accuracy relative to higher resolution models and measurements despite the performance enhancements that have made it possible to apply this radiation code successfully to global dynamical models. This model includes the radiative effects of all significant atmospheric gases, and it treats the absorption and scattering from liquid and ice clouds and aerosols. RRTMG also includes a statistical technique for representing small-scale cloud variability, such as cloud fraction and the vertical overlap of clouds, which has been shown to improve cloud radiative forcing in global models. This development approach has provided a direct link from observations to the enhanced radiative transfer provided by RRTMG for application to GCMs. Recent comparison of existing climate model radiation codes with high resolution models has documented the improved radiative forcing capability provided by RRTMG, especially at the surface, relative to other GCM radiation models. Due to its high accuracy, its connection to observations, and its computational efficiency, RRTMG has been implemented operationally in many national and international dynamical models to provide validated radiative transfer for improving weather forecasts and enhancing the prediction of global climate change.

Michael J Iacono

2011-04-07T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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

A Linear Parabolic Trough Solar Collector Performance Model  

E-Print Network (OSTI)

A performance model has been programmed for solar thermal collector based on a linear, tracking parabolic trough reflector focused on a surface-treated metallic pipe receiver enclosed in an evacuated transparent tube: a Parabolic Trough Solar Collector (PTSC). This steady state, single dimensional model comprises the fundamental radiative and convective heat transfer and mass and energy balance relations programmed in the Engineering Equation Solver, EES. It considers the effects of solar intensity and incident angle, collector dimensions, material properties, fluid properties, ambient conditions, and operating conditions on the performance of the collector: the PTSC. Typical performance calculations show that when hot-water at 165C flows through a 6m by 2.3m PTSC with 900 w/m^2 solar insulation and 0 incident angle, the estimated collector efficiency is about 55% The model predictions will be confirmed by the operation of PTSCs now being installed at Carnegie Mellon.

Qu, M.; Archer, D.; Masson, S.

2006-01-01T23:59:59.000Z

82

Improved interval estimation of long run response from a dynamic linear model: A highest density region approach  

Science Conference Proceedings (OSTI)

This paper proposes a new method of interval estimation for the long run response (or elasticity) parameter from a general linear dynamic model. We employ the bias-corrected bootstrap, in which small sample biases associated with the parameter estimators ... Keywords: ARDL model, Bias-correction, Bootstrapping, Highest density region, Long run elasticity

Jae H. Kim; Iain Fraser; Rob J. Hyndman

2011-08-01T23:59:59.000Z

83

Using Green's Functions to Calibrate an Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

Green's functions provide a simple yet effective method to test and to calibrate general circulation model (GCM) parameterizations, to study and to quantify model and data errors, to correct model biases and trends, and to blend estimates from ...

Dimitris Menemenlis; Ichiro Fukumori; Tong Lee

2005-05-01T23:59:59.000Z

84

A Hybrid Coupled General Circulation Model for El Niño Studies  

Science Conference Proceedings (OSTI)

A model is developed for tropical air–sea interaction studies, which is intermediate in complexity between the large coupled general circulation models (coupled GCMs) coming into use and the simple two-level models with which pioneering El Niño–...

J. David Neelin

1990-03-01T23:59:59.000Z

85

General model of quantum key distribution  

E-Print Network (OSTI)

A general mathematical framework for quantum key distribution based on the concepts of quantum channel and Turing machine is suggested. The security for its special case is proved. The assumption is that the adversary can perform only individual (in essence, classical) attacks. For this case an advantage of quantum key distribution over classical one is shown.

A. S. Trushechkin; I. V. Volovich

2005-04-20T23:59:59.000Z

86

A Generalized Pyrolysis Model for Combustible Solids  

E-Print Network (OSTI)

decomposition fronts in wood,” Combustion and Flame 139: 16–dynamics modeling of wood combustion,” Fire Safety Journalduring the pyrolysis of wood,” Combustion and Flame 17: 79–

Lautenberger, Chris

2007-01-01T23:59:59.000Z

87

A Generalized Pyrolysis Model for Combustible Solids  

E-Print Network (OSTI)

surface heat losses, heat conduction to the interior of the2.3.1 Solid phase heat conduction Thermophysical propertiesequation similar to the heat conduction equation. The model

Lautenberger, Chris

2007-01-01T23:59:59.000Z

88

Extraction of Piecewise-Linear Analog Circuit Models from Trained Neural Networks Using Hidden Neuron Clustering  

Science Conference Proceedings (OSTI)

This paper presents a new technique for automatically creating analog circuit models. The method extracts - from trained neural networks - piecewise linear models expressing the linear dependencies between circuit performances and design parameters. ...

Simona Doboli; Gaurav Gothoskar; Alex Doboli

2003-03-01T23:59:59.000Z

89

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

90

MODULAR BRANCHING RULES FOR 2-COLUMN DIAGRAM REPRESENTATIONS OF GENERAL LINEAR GROUPS  

E-Print Network (OSTI)

Outline for doing work at SSRL Goals: 1. Work effectively, efficiently and safely 2. Compliance://www-group.slac.stanford.edu/esh/general/isems/ 3. Compliance with SLAC operating directives as found on the SSRL safety web page http://www-ssrl processes given in http://www- ssrl.slac.stanford.edu/safety/index.html. 5. Ensure procedures are up to date

Baranov, Alexander

91

Modeling of Antarctic sea ice in a general circulation model  

SciTech Connect

A dynamic-thermodynamic sea ice model is developed and coupled with the Melbourne University general circulation model to simulate the seasonal cycle of the Antarctic sea ice distributions The model is efficient, rapid to compute, and useful for a range of climate studies. The thermodynamic part of the sea ice model is similar to that developed by Parkinson and Washington, the dynamics contain a simplified ice rheology that resists compression. The thermodynamics is based on energy conservation at the top surface of the ice/snow, the ice/water interface, and the open water area to determine the ice formation, accretion, and ablation. A lead parameterization is introduced with an effective partitioning scheme for freezing between and under the ice floes. The dynamic calculation determines the motion of ice, which is forced with the atmospheric wind, taking account of ice resistance and rafting. The simulated sea ice distribution compares reasonably well with observations. The seasonal cycle of ice extent is well simulated in phase as well as in magnitude. Simulated sea ice thickness and concentration are also in good agreement with observations over most regions and serve to indicate the importance of advection and ocean drift in the determination of the sea ice distribution. 64 refs., 15 figs., 2 tabs.

Wu, Xingren; Budd, W.F. [Antarctic Cooperative Research Centre, Tasmania (Australia)] [Antarctic Cooperative Research Centre, Tasmania (Australia); Simmonds, I. [School of Earth Sciences, Victoria (Australia)] [School of Earth Sciences, Victoria (Australia)

1997-04-01T23:59:59.000Z

92

Identification and modeling for non-linear dynamic system using neural networks type MLP  

Science Conference Proceedings (OSTI)

In control systems, the model dynamics of linear systems is the principal and most important phase of a project, but when working with dynamic of non-linear systems obtain the model becomes a very complex task can be used techniques of system identification. ... Keywords: LP, algorithms, dynamic backprogation, modeling, multilayer perceptrons, neural networks dynamics, non-linear dynamics, training

Hernán González Acuña; Max Suell Dutra; Omar Lengerke

2009-06-01T23:59:59.000Z

93

Initial Conditions for a General Circulation Model of Tropical Oceans  

Science Conference Proceedings (OSTI)

A general circulation model of the tropical Pacific Ocean, which realistically simulates El Niño of 1982–83, has been used to determine how different initial conditions affect the model. Given arbitrary initial conditions (not in equilibrium with ...

S. G. H. Philander; W. J. Hurlin; R. C. Pacanowski

1987-01-01T23:59:59.000Z

94

Indian Ocean Intraseasonal Variability in an Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

The impact of atmospheric intraseasonal variability on the tropical Indian Ocean is examined with an ocean general circulation model (OGCM). The model is forced by observation-based wind stresses and surface heat fluxes from an atmospheric ...

A. Schiller; J. S. Godfrey

2003-01-01T23:59:59.000Z

95

General model of oil shale pyrolysis  

DOE Green Energy (OSTI)

A mathematical model for pyrolysis of Green River oil shale is developed from previous experiments on oil, water, and gas evolution and oil cracking over a wide range of pyrolysis conditions. Reactions included are evolution of 5 gas species, oil, and water from kerogen, clay dehydration, oil coking and cracking, and evolution of H/sub 2/ and CH/sub 4/ from char. Oil is treated in eleven boiling-point fractions in order to treat the competition between oil coking and evaporation, and to evaluate the effect of oil cracking on the boiling point distribution of the oil. The kinetics and product yields calculated by the model are compared to experimental results for pyrolysis conditions ranging from isothermal fluid-bed to high-pressure slow-heating-rate retorting.

Burnham, A.K.; Braun, R.L.

1983-11-01T23:59:59.000Z

96

A single model of interacting dark energy: generalized phantom energy or generalized Chaplygin gas  

E-Print Network (OSTI)

I present a model in which dark energy interacts with matter. The former is represented by a variable equation of state. It is shown that the phantom crossing takes place at zero redshift, moreover, stable scaling solution of the Friedmann equations is obtained. I show that dark energy is most probably be either generalized phantom energy or the generalized Chaplygin gas.

Mubasher Jamil

2009-12-22T23:59:59.000Z

97

ENV-Linkages General Equilibrium Model | Open Energy Information  

Open Energy Info (EERE)

ENV-Linkages General Equilibrium Model ENV-Linkages General Equilibrium Model Jump to: navigation, search Tool Summary Name: ENV-Linkages General Equilibrium Model Agency/Company /Organization: Organisation for Economic Co-Operation and Development Topics: Co-benefits assessment Resource Type: Software/modeling tools Website: www.oecd.org/officialdocuments/displaydocumentpdf/?cote=ECO/WKP(2008)6 References: OECD[1] Summary "The OECD ENV-Linkages General Equilibrium (GE) model is the successor to the OECD GREEN model for environmental studies, which was initially developed by the OECD Economics Department (Burniaux, et al. 1992) and is now hosted at the OECD Environment Directorate. GREEN was originally used for studying climate change mitigation policy and culminated in Burniaux (2000). It was developed into the Linkages model, and subsequently became

98

Solution of a Linearized Model of Heisenberg's Fundamental Equation II  

E-Print Network (OSTI)

A linearized version of Heisenberg's fundamental equation is solved, and the solutions satisfy the axioms of a relativistic quantum field theory with a fundamental length.

E. Brüning; S. Nagamachi

2008-04-11T23:59:59.000Z

99

Mixed-Integer Models for Nonseparable Piecewise Linear ...  

E-Print Network (OSTI)

55. Society for Industrial and Applied Mathematics. Wilson, D. L. 1998. Polyhedral methods for piecewise-linear functions. Ph.D. thesis, University of Kentucky.

100

Model for Energy Supply System Alternatives and their General Environmental  

Open Energy Info (EERE)

Model for Energy Supply System Alternatives and their General Environmental Model for Energy Supply System Alternatives and their General Environmental Impacts (MESSAGE) (Redirected from Model for Energy Supply System Alternatives and their General Environmental Impacts) Jump to: navigation, search Tool Summary Name: Model for Energy Supply System Alternatives and their General Environmental Impacts Agency/Company /Organization: International Atomic Energy Agency Sector: Energy Focus Area: Renewable Energy, Energy Efficiency Topics: Pathways analysis Resource Type: Software/modeling tools Website: www-tc.iaea.org/tcweb/abouttc/strategy/Thematic/pdf/presentations/ener References: Overview of IAEA PESS Models [1] "MESSAGE combines technologies and fuels to construct so-called "energy chains", making it possible to map energy flows from supply (resource

Note: This page contains sample records for the topic "general linear model" 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

Three-Dimensional Linear Instability Modeling of the Cloud Level Venus Atmosphere  

Science Conference Proceedings (OSTI)

Based on the success of several 2-D (latitude, longitude) linear barotropic instability models at matching some of the observed characteristics of the cloud level, polar region of the Venus atmosphere, a more realistic, linear, 3-D (height, ...

Lee S. Elson

1989-12-01T23:59:59.000Z

102

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-François Mahfouf

2005-06-01T23:59:59.000Z

103

General Equilibrium Modeling Package (GEMPACK) | Open Energy Information  

Open Energy Info (EERE)

General Equilibrium Modeling Package (GEMPACK) General Equilibrium Modeling Package (GEMPACK) Jump to: navigation, search LEDSGP green logo.png FIND MORE DIA TOOLS This tool is part of the Development Impacts Assessment (DIA) Toolkit from the LEDS Global Partnership. Tool Summary LAUNCH TOOL Name: General Equilibrium Modeling Package (GEMPACK) Agency/Company /Organization: Centre of Policy Studies, Monash University Sector: Climate Topics: Analysis Tools Complexity/Ease of Use: Advanced Website: www.monash.edu.au/policy/gempack.htm Cost: Paid Related Tools Ex Ante Appraisal Carbon-Balance Tool (EX-ACT) MIT Emissions Prediction and Policy Analysis (EPPA) Model Energy Forecasting Framework and Emissions Consensus Tool (EFFECT) ... further results A system for computable general equilibrium economic modeling, produced and

104

General Equilibrium Emissions Model (GEEM) | Open Energy Information  

Open Energy Info (EERE)

General Equilibrium Emissions Model (GEEM) General Equilibrium Emissions Model (GEEM) Jump to: navigation, search Tool Summary Name: General Equilibrium Emissions Model (GEEM) Agency/Company /Organization: International Institute for Sustainable Development (IISD) Sector: Climate, Energy Focus Area: Renewable Energy, Non-renewable Energy, Agriculture, Buildings, Economic Development, Energy Efficiency, Forestry, Goods and Materials, Greenhouse Gas, Industry, Offsets and Certificates, Transportation Topics: Background analysis, Baseline projection, GHG inventory, Low emission development planning, Market analysis, Pathways analysis, Policies/deployment programs, Technology characterizations Country: Kenya, Thailand UN Region: Eastern Africa, Caribbean Coordinates: 13.7240216°, 100.5798602°

105

A General Circulation Model for Upper Ocean Simulation  

Science Conference Proceedings (OSTI)

A general circulation model (GCM) of the ocean that emphasizes the simulation of the upper ocean has been developed. This emphasis is in keeping with its future intent, that of an air-sea coupled model. The basic model is the primitive equation ...

A. Rosati; K. Miyakoda

1988-11-01T23:59:59.000Z

106

Model for Energy Supply System Alternatives and their General Environmental  

Open Energy Info (EERE)

Model for Energy Supply System Alternatives and their General Environmental Model for Energy Supply System Alternatives and their General Environmental Impacts (MESSAGE) Jump to: navigation, search Tool Summary Name: Model for Energy Supply System Alternatives and their General Environmental Impacts Agency/Company /Organization: International Atomic Energy Agency Sector: Energy Focus Area: Renewable Energy, Energy Efficiency Topics: Pathways analysis Resource Type: Software/modeling tools Website: www-tc.iaea.org/tcweb/abouttc/strategy/Thematic/pdf/presentations/ener References: Overview of IAEA PESS Models [1] "MESSAGE combines technologies and fuels to construct so-called "energy chains", making it possible to map energy flows from supply (resource extraction) to demand (energy services). The model can help design long

107

Arctic and Antarctic Climatology of a GLAS General Circulation Model  

Science Conference Proceedings (OSTI)

The performance of a recent version of the general circulation model used at the Goddard Laboratory for Atmospheric Science is evaluated with particular emphasis on its behavior at high latitudes of the Northern and Southern Hemispheres. A ...

G. F. Herman; W. T. Johnson

1980-12-01T23:59:59.000Z

108

Multiple Equilibria in a Global Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

A global ocean general circulation model is forced using various upper boundary conditions (BCs) on temperature and salinity. Solutions are obtained under restoring and mixed BCs (i.e., a restoring condition on the upper-level temperature but ...

S. B. Power; R. Kleeman

1993-08-01T23:59:59.000Z

109

Generalized Exponential Markov and Model Output Statistics: A Comparative Verification  

Science Conference Proceedings (OSTI)

We performed a comparative verification of Model Output Statistics (MOS) against Generalized Exponential Markov (GEM), a single station forecasting technique which uses only the surface observation and climatology as input. The verification was ...

Thomas J. Perrone; Robert G. Miller

1985-09-01T23:59:59.000Z

110

A Moist Benchmark Calculation for Atmospheric General Circulation Models  

Science Conference Proceedings (OSTI)

A benchmark calculation is designed to compare the climate and climate sensitivity of atmospheric general circulation models (AGCMs). The experimental setup basically follows that of the aquaplanet experiment (APE) proposed by Neale and Hoskins, ...

Myong-In Lee; Max J. Suarez; In-Sik Kang; Isaac M. Held; Daehyun Kim

2008-10-01T23:59:59.000Z

111

Parameter Sensitivity of Primitive Equation Ocean General Circulation Models  

Science Conference Proceedings (OSTI)

Experiments with a low resolution, primitive equation ocean general circulation model with idealized basin geometry and surface forcing have been carried out in order to identify the processes controlling the climatically important aspects of the ...

Frank Bryan

1987-07-01T23:59:59.000Z

112

Potential Evaporation and Soil Moisture in General Circulation Models  

Science Conference Proceedings (OSTI)

The parameterization of continental evaporation in many atmospheric general circulation models (GCMS) used for simulation of climate is demonstrably inconsistent with the empirical work upon which the parameterization is based. In the turbulent ...

P. C. D. Milly

1992-03-01T23:59:59.000Z

113

Optimizing Parameters in an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

An efficient method to optimize the parameter values of the subgrid parameterizations of an atmospheric general circulation model is described. The method is based on the downhill simplex minimization of a cost function computed from the ...

C. A. Severijns; W. Hazeleger

2005-09-01T23:59:59.000Z

114

Factors Affecting Heat Transport in an Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

A global ocean general circulation model with idealized geometry and coupled to a simple representation of atmospheric energy fluxes is used to investigate which physical factors determine meridional heat transport. A particular focus is on ...

Igor Kamenkovich; Jochem Marotzke; Peter H. Stone

2000-01-01T23:59:59.000Z

115

Baroclinic Development in Observations and NASA GSFC General Circulation Models  

Science Conference Proceedings (OSTI)

Comparative diagnostic analyses of developing synoptic-scale baroclinic disturbances in NCEP–NCAR reanalyses and the NASA–NCAR (NASCAR) and Aries [NASA’s Seasonal-to-Interannual Prediction Project (NSIPP)] general circulation model simulations ...

Dennis P. Robinson; Robert X. Black

2006-04-01T23:59:59.000Z

116

Steady Linear Response to Thermal Forcing of an Anomaly Model with an Asymmetric Climatology  

Science Conference Proceedings (OSTI)

An anomaly model linearized around the observed winter climatology is used to study the steady response of the atmosphere to diabatic heating. The model is an R7, nine vertical levels, primitive equations, fully spectral model, derived from the ...

A. Navarra

1990-01-01T23:59:59.000Z

117

Validity of the Tangent Linear Approximation in a Moist Convective Cloud Model  

Science Conference Proceedings (OSTI)

The validity of the moist tangent linear model (TLM) derived from a time-dependent 1D Eulerian cloud model is investigated by comparing TLM solutions to differences between results from a nonlinear model identically perturbed. The TLM solutions ...

Seon Ki Park; Kelvin K. Droegemeier

1997-12-01T23:59:59.000Z

118

Results and Comparison from the SAM Linear Fresnel Technology Performance Model: Preprint  

DOE Green Energy (OSTI)

This paper presents the new Linear Fresnel technology performance model in NREL's System Advisor Model. The model predicts the financial and technical performance of direct-steam-generation Linear Fresnel power plants, and can be used to analyze a range of system configurations. This paper presents a brief discussion of the model formulation and motivation, and provides extensive discussion of the model performance and financial results. The Linear Fresnel technology is also compared to other concentrating solar power technologies in both qualitative and quantitative measures. The Linear Fresnel model - developed in conjunction with the Electric Power Research Institute - provides users with the ability to model a variety of solar field layouts, fossil backup configurations, thermal receiver designs, and steam generation conditions. This flexibility aims to encompass current market solutions for the DSG Linear Fresnel technology, which is seeing increasing exposure in fossil plant augmentation and stand-alone power generation applications.

Wagner, M. J.

2012-04-01T23:59:59.000Z

119

Determining manufacturing parameters to suppress system variance using linear and non-linear models  

Science Conference Proceedings (OSTI)

Determining manufacturing parameters for a new product is fundamentally a difficult problem, because there has little suggestion information. There are several researches on this topic, and most of them focus on single specific model or the engineer's ... Keywords: Engineering problem, Manufacturing, TFT-LCD

Der-Chiang Li; Wen-Chih Chen; Chiao-Wen Liu; Che-Jung Chang; Chien-Chih Chen

2012-03-01T23:59:59.000Z

120

Environmental Impact and Sustainability Applied General Equilibrium Model  

Open Energy Info (EERE)

Page Page Edit with form History Facebook icon Twitter icon » Environmental Impact and Sustainability Applied General Equilibrium Model (ENVISAGE) Jump to: navigation, search LEDSGP green logo.png FIND MORE DIA TOOLS This tool is part of the Development Impacts Assessment (DIA) Toolkit from the LEDS Global Partnership. Tool Summary LAUNCH TOOL Name: Environmental Impact and Sustainability Applied General Equilibrium Model (ENVISAGE) Agency/Company /Organization: World Bank Sector: Climate Topics: Analysis Tools Complexity/Ease of Use: Advanced Website: go.worldbank.org/ZC77UJYJ50 Related Tools TransportToolkit Prototype Threshold 21 Model General Equilibrium Modeling Package (GEMPACK) ... further results Designed to analyze a variety of issues related to the economics of climate

Note: This page contains sample records for the topic "general linear model" 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.


121

Asian Summer Monsoon Intraseasonal Variability in General Circulation Models  

SciTech Connect

The goals of this report are: (1) Analyze boreal summer Asian monsoon intraseasonal variability general circulation models--How well do the models represent the eastward and northward propagating components of the convection and how well do the models represent the interactive control that the western tropical Pacific rainfall exerts on the rainfall over India and vice-versa? (2) Role of air-sea interactions--prescribed vs. interactive ocean; and (3) Mean monsoon vs. variability.

Sperber, K R; Annamalai, H

2004-02-24T23:59:59.000Z

122

Comparative Evaluation of Generalized River/Reservoir System Models  

E-Print Network (OSTI)

This report reviews user-oriented generalized reservoir/river system models. The terms reservoir/river system, reservoir system, reservoir operation, or river basin management "model" or "modeling system" are used synonymously to refer to computer modeling systems that simulate the storage, flow, and diversion of water in a system of reservoirs and river reaches. Generalized means that a computer modeling system is designed for application to a range of concerns dealing with river basin systems of various configurations and locations, rather than being site-specific customized to a particular system. User-oriented implies the modeling system is designed for use by professional practitioners (model-users) other than the original model developers and is thoroughly tested and well documented. User-oriented generalized modeling systems should be convenient to obtain, understand, and use and should work correctly, completely, and efficiently. Modeling applications often involve a system of several simulation models, utility software products, and databases used in combination. A reservoir/river system model is itself a modeling system, which often serves as a component of a larger modeling system that may include watershed hydrology and river hydraulics models, water quality models, databases and various software tools for managing time series, spatial, and other types of data. Reservoir/river system models are based on volume-balance accounting procedures for tracking the movement of water through a system of reservoirs and river reaches. The model computes reservoir storage contents, evaporation, water supply withdrawals, hydroelectric energy generation, and river flows for specified system operating rules and input sequences of stream inflows and net evaporation rates. The hydrologic period-of-analysis and computational time step may vary greatly depending on the application. Storage and flow hydrograph ordinates for a flood event occurring over a few days may be determined at intervals of an hour or less. Water supply capabilities may be modeled with a monthly time step and several decade long period-of-analysis capturing the full range of fluctuating wet and dry periods including extended drought. Stream inflows are usually generated outside of the reservoir/river system model and provided as input to the model. However, reservoir/river system models may also include capabilities for modeling watershed precipitation-runoff processes to generate inflows to the river/reservoir system. Some reservoir/river system models simulate water quality constituents along with water quantities. Some models include features for economic evaluation of system performance based on cost and benefit functions expressed as a function of flow and storage.

Wurbs, Ralph A.

2005-04-01T23:59:59.000Z

123

Simulation of Tropical Climate with a Linear Primitive Equation Model  

Science Conference Proceedings (OSTI)

The tropical climate simulated with a new global atmosphere model is presented. The model is purposely designed for climate studies and is still under development. It is designed to bridge the gap between very efficient but simple models of the ...

Richard Seager; Stephen E. Zebiak

1995-10-01T23:59:59.000Z

124

Model study of generalized parton distributions with helicity flip  

E-Print Network (OSTI)

Generalized parton distributions with helicity flip are studied in the quark sector, within a simple version of the MIT bag model, assuming an SU(6) wave function for the proton target. In the framework under scrutiny it turns out that only the generalized transversity distribution, H_T^q, is non vanishing. For this quantity, the forward limit is properly recovered and numerical results are found to underestimate recent lattice data for its first moment. Positivity bounds recently proposed are fulfilled by the obtained distribution. The relevance of the analysis for the planning of measurements of the quark generalized transversity is addressed.

Sergio Scopetta

2005-09-26T23:59:59.000Z

125

A Linear Equivalent Barotropic Model of the Antarctic Circumpolar Current with Realistic Coastlines and Bottom Topography  

Science Conference Proceedings (OSTI)

A linear equivalent barotropic (EB) model is applied to study the effects of the bottom topography H and baroclinicity on the total transport and the position of the Antarctic Circumpolar Current (ACC). The model is based on the observation of ...

Alexander Krupitsky; Vladimir M. Kamenkovich; Naomi Naik; Mark A. Cane

1996-09-01T23:59:59.000Z

126

Diagnosing the Impact of Stratospheric Planetary Wave Breaking in a Linear Model  

Science Conference Proceedings (OSTI)

In the past, linear quasigeostrophic theory has proven successful in modeling the vertical and meridional propagation of stationary planetary waves in the stratosphere. Since in such models the wave solution does not sensitively depend on the ...

Christian Hauck; Volkmar Wirth

2001-06-01T23:59:59.000Z

127

Estimating the Spatial Distribution of Precipitation in Iceland Using a Linear Model of Orographic Precipitation  

Science Conference Proceedings (OSTI)

A linear model of orographic precipitation that includes airflow dynamics, condensed water advection, and downslope evaporation is adapted for Iceland. The model is driven using coarse-resolution 40-yr reanalysis data from the European Centre for ...

Philippe Crochet; Tómas Jóhannesson; Trausti Jónsson; Oddur Sigurðsson; Helgi Björnsson; Finnur Pálsson; Idar Barstad

2007-12-01T23:59:59.000Z

128

Nonlinear and linear models for losses of plug in hybrid electric vehicle: A computation approach  

Science Conference Proceedings (OSTI)

This paper presents nonlinear and linear models for the losses of Plug in Hybrid Electric Vehicle (PHEV). An accurate model to calculate the PHEV losses for just one vehicle is not remarkable. However

2013-01-01T23:59:59.000Z

129

Generalized holographic dark energy model described at the Hubble length  

E-Print Network (OSTI)

We generalize the holographic dark energy model described in Hubble length IR cutoff by assuming a slowly time varying function for holographic parameter $c^2$. We calculate the evolution of EoS parameter and the deceleration parameter as well as the evolution of dark energy density in this generalized model. We show that the phantom line is crossed from quintessence regime to phantom regime which is in agreement with observation. The evolution of deceleration parameter indicates the transition from decelerated to accelerated expansion. Eventually, we show that the GHDE with HIR cutoff can interpret the pressureless dark matter era at the early time and dark energy dominated phase later.

M. Malekjani

2012-09-25T23:59:59.000Z

130

general  

Science Conference Proceedings (OSTI)

ANSYS Fluent software contains the broad physical modeling capabilities needed to model flow, turbulence, heat transfer, and reactions for a wide variety of ...

131

Generalized Teleparallel Gravity Via Some Scalar Field Dark Energy Models  

E-Print Network (OSTI)

We consider generalized teleparallel gravity in the flat FRW universe with a viable power-law f(T) model. We construct its equation of state and deceleration parameters which give accelerated expansion of the universe in quintessence era for the obtained scale factor. Further, we develop correspondence of f(T) model with scalar field models such as, quintessence, tachyon, K-essence and dilaton. The dynamics of scalar field as well as scalar potential of these models indicate the expansion of the universe with acceleration in the f(T) gravity scenario.

M. Sharif; Shamaila Rani

2013-11-25T23:59:59.000Z

132

Modeling Smart Grid using Generalized Stochastic Petri Net  

E-Print Network (OSTI)

Building smart grid for power system is a major challenge for safe, automated and energy efficient usage of electricity. The full implementation of the smart grid will evolve over time. However, before a new set of infrastructures are invested to build the smart grid, proper modeling and analysis is needed to avoid wastage of resources. Modeling also helps to identify and prioritize appropriate systems parameters. In this paper, an all comprehensive model of smart grid have been proposed using Generalized Stochastic Petri Nets (GSPN). The model is used to analyze the constraints and deliverables of the smart power grid of future.

Dey, Amrita; Sanyal, Sugata

2011-01-01T23:59:59.000Z

133

SystemC-AMS high-level modeling of linear analog blocks with power consumption information  

Science Conference Proceedings (OSTI)

SystemC-AMS allows the modeling of complex heterogeneous systems at different levels of abstraction using different modeling styles, called Models of Computation (MoC). This work presents an approach for including energy consumption information in high-level ... Keywords: passive fourth-order low pass filter, systemC-AMS high-level modeling, linear analog blocks, power consumption information, energy consumption information, linear electrical circuits, systemC-AMS linear signal flow MoC, SPICE netlist, state space representation extraction, LSF description level

L. Bousquet; F. Cenni; E. Simeu

2011-03-01T23:59:59.000Z

134

JAYNES PRINCIPLE IN TESTING SIGNIFICANT VARIABLES OF LINEAR MODEL  

E-Print Network (OSTI)

inspection of scatter diagrams of data N­sequences (X N (#), Z N ) for each # = 1, . . . , t, was proposed­parametricity of tests. It was proved in Malyutov (1979, 1983) for general finite­valued mod­ els that the asym

Sridhar, Srinivas

135

Validation of General Circulation Model Radiative Fluxes Using Surface Observations  

Science Conference Proceedings (OSTI)

The surface radiative fluxes of the ECHAM3 General Circulation Model (GCM) with T2 1, T42, and T 106 resolutions have been validated using observations from the Global Energy Balance Archive (GEBA, World Climate Program-Water Project A7). GEBA ...

Martin Wild; Atsumu Ohmura; Hans Gilgen; Erich Roeckner

1995-05-01T23:59:59.000Z

136

Diabatic Heating in the UCLA General Circulation Model  

Science Conference Proceedings (OSTI)

Diabatic heating rates calculated in the UCLA general circulation model are analyzed. The heating rates are for the December–January–February season for the mean of four climatological runs and the mean of four runs with observed 1982/83 sea ...

Bryan C. Weare

1988-07-01T23:59:59.000Z

137

A mutation-selection model with recombination for general genotypes  

E-Print Network (OSTI)

A mutation-selection model with recombination for general genotypes Steven N. Evans David II: Polynomial selective costs 9 1.4. Example III: Demographic selective costs 10 1.5. Comments selective cost 23 3.3. Fr´echet derivatives 26 3.4. Existence of equilibria via perturbation 27 3.5. Concave

Evans, Steven N.

138

Improved estimators for a general class of beta regression models  

Science Conference Proceedings (OSTI)

In this article, we extend the beta regression model proposed by Ferrari and Cribari-Neto (2004), which is generally useful in situations where the response is restricted to the standard unit interval in two different ways: we let the regression structure ...

Alexandre B. Simas; Wagner Barreto-Souza; Andréa V. Rocha

2010-02-01T23:59:59.000Z

139

Direct-Steam Linear Fresnel Performance Model for NREL's System Advisor Model  

DOE Green Energy (OSTI)

This paper presents the technical formulation and demonstrated model performance results of a new direct-steam-generation (DSG) model in NREL's System Advisor Model (SAM). The model predicts the annual electricity production of a wide range of system configurations within the DSG Linear Fresnel technology by modeling hourly performance of the plant in detail. The quasi-steady-state formulation allows users to investigate energy and mass flows, operating temperatures, and pressure drops for geometries and solar field configurations of interest. The model includes tools for heat loss calculation using either empirical polynomial heat loss curves as a function of steam temperature, ambient temperature, and wind velocity, or a detailed evacuated tube receiver heat loss model. Thermal losses are evaluated using a computationally efficient nodal approach, where the solar field and headers are discretized into multiple nodes where heat losses, thermal inertia, steam conditions (including pressure, temperature, enthalpy, etc.) are individually evaluated during each time step of the simulation. This paper discusses the mathematical formulation for the solar field model and describes how the solar field is integrated with the other subsystem models, including the power cycle and optional auxiliary fossil system. Model results are also presented to demonstrate plant behavior in the various operating modes.

Wagner, M. J.; Zhu, G.

2012-09-01T23:59:59.000Z

140

E-model for Transportation Problem of Linear Stochastic Fractional ...  

E-Print Network (OSTI)

studied stochastic transportation model for petroleum transport as well ... homogenous commodity from m sources to n of destinations, where the demand for the.

Note: This page contains sample records for the topic "general linear model" 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

System Advisor Model, SAM 2011.12.2: General Description  

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

System Advisor Model, System Advisor Model, SAM 2011.12.2: General Description Paul Gilman and Aron Dobos Technical Report NREL/TP-6A20-53437 February 2012 NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency & Renewable Energy, operated by the Alliance for Sustainable Energy, LLC. National Renewable Energy Laboratory 1617 Cole Boulevard Golden, Colorado 80401 303-275-3000 * www.nrel.gov Contract No. DE-AC36-08GO28308 System Advisor Model, SAM 2011.12.2: General Description Paul Gilman and Aron Dobos Prepared under Task No. SS12.1130 Technical Report NREL/TP-6A20-53437 February 2012 NOTICE This report was prepared as an account of work sponsored by an agency of the United States government.

142

Posters A Stratiform Cloud Parameterization for General Circulation Models  

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

Posters A Stratiform Cloud Parameterization for General Circulation Models S. J. Ghan and L. R. Leung Pacific Northwest Laboratory Richland, Washington C. C. Chuang and J. E. Penner Lawrence Livermore National Laboratory Livermore, California J. McCaa University of Washington Seattle, Washington The crude treatment of clouds in general circulation models (GCMs) is widely recognized as a major limitation in applying these models to predictions of global climate change. The purpose of this project is to develop a parameterization for stratiform clouds in GCMs that expresses stratiform clouds in terms of bulk microphysical properties and their subgrid variability. In this parameterization, precipitating cloud species are distinguished from non-precipitating species, and the liquid

143

Holographic Dark Energy Model with Modified Generalized Chaplygin Gas  

E-Print Network (OSTI)

We present a holographic dark energy model of the universe considering modified generalized Chaplygin gas (GCG). The modified GCG behaves as an ordinary barotropic fluid in the early epoch when the universe was tiny but behaves subsequently as a $\\Lambda$CDM model at late epoch. An equivalent model with scalar field is obtained here by constructing the corresponding potential. The holographic dark energy is identified with the modified GCG and we determine the corresponding holographic dark energy field and its potential. The stability of the holographic dark energy in this case is also discussed.

B. C. Paul; P. Thakur; A. Saha

2007-07-31T23:59:59.000Z

144

Data Constraints Applied to Models of the Ocean General Circulation. Part II: The Transient, Eddy-Resolving Case  

Science Conference Proceedings (OSTI)

In Part I of the present work we performed assimilation experiments with a multilayer, quasi-geostrophic (QG) eddy-resolving model of the ocean general circulation. In Part I we studied the quasi-linear, steady state and the assimilated data were ...

Paola Malanotte-Rizzoli; William R. Holland

1988-08-01T23:59:59.000Z

145

Nonlinear Normal Mode Initialization of a Limited-Area Model: Inclusion of All Beta Terms in the Linearized Model Equations  

Science Conference Proceedings (OSTI)

A nonlinear normal mode initialization method with all of the beta terms included in the linearized model equations is formulated for a limited-area model. It is the extension of an earlier method examining the sensitivity of nonlinear normal ...

S. J. Bijlsma

1991-04-01T23:59:59.000Z

146

Optimal reinsurance/investment problems for general insurance models  

E-Print Network (OSTI)

In this paper the utility optimization problem for a general insurance model is studied. The reserve process of the insurance company is described by a stochastic differential equation driven by a Brownian motion and a Poisson random measure, representing the randomness from the financial market and the insurance claims, respectively. The random safety loading and stochastic interest rates are allowed in the model so that the reserve process is non-Markovian in general. The insurance company can manage the reserves through both portfolios of the investment and a reinsurance policy to optimize a certain utility function, defined in a generic way. The main feature of the problem lies in the intrinsic constraint on the part of reinsurance policy, which is only proportional to the claim-size instead of the current level of reserve, and hence it is quite different from the optimal investment/consumption problem with constraints in finance. Necessary and sufficient conditions for both well posedness and solvability...

Liu, Yuping; 10.1214/08-AAP582

2009-01-01T23:59:59.000Z

147

Development of the Upgraded Tangent Linear and Adjoint of the Weather Research and Forecasting (WRF) Model  

Science Conference Proceedings (OSTI)

The authors propose a new technique for parallelizations of tangent linear and adjoint codes, which were applied in the redevelopment for the Weather Research and Forecasting (WRF) model with its Advanced Research WRF dynamic core using the ...

Xin Zhang; Xiang-Yu Huang; Ning Pan

2013-06-01T23:59:59.000Z

148

A Linear Stochastic Model of a GCM’s Midlatitude Storm Tracks  

Science Conference Proceedings (OSTI)

A linear stochastic model is used to simulate the midlatitude storm tracks produced by an atmospheric GCM. A series of six perpetual insolation/SST GCM experiments are first performed for each month. These experiments capture the “midwinter ...

Yunqing Zhang; Isaac M. Held

1999-10-01T23:59:59.000Z

149

A Linear Model of Wintertime Low-Frequency Variability. Part I: Formulation and Forecast Skill  

Science Conference Proceedings (OSTI)

A linear inverse model (LIM) suitable for studies of atmospheric extratropical variability on longer than weekly timescales is constructed using observations of the past 30 years. Notably, it includes tropical diabatic heating as an evolving ...

Christopher R. Winkler; Matthew Newman; Prashant D. Sardeshmukh

2001-12-01T23:59:59.000Z

150

Prediction of Tropical Atlantic Sea Surface Temperatures Using Linear Inverse Modeling  

Science Conference Proceedings (OSTI)

The predictability of tropical Atlantic sea surface temperature on seasonal to interannual timescales by linear inverse modeling is quantified. The authors find that predictability of Caribbean Sea and north tropical Atlantic sea surface ...

Cécile Penland; Ludmila Matrosova

1998-03-01T23:59:59.000Z

151

Quasi-Linear Blocks Forced by Orography in a Hemispheric, Quasi-Geostrophic Barotropic Model  

Science Conference Proceedings (OSTI)

Stationary linear perturbation responses to Northern Hemisphere orography are calculated in a quasi-geostrophic barotropic model in solid-body rotation. The stationary mountain torque induced by these perturbations is then used to construct ...

John O. Roads

1981-07-01T23:59:59.000Z

152

Bounding the electrostatic free energies associated with linear continuum models of molecular solvation  

Science Conference Proceedings (OSTI)

The importance of electrostatic interactions in molecular biology has driven extensive research toward the development of accurate and efficient theoretical and computational models. Linear continuum electrostatic theory has been surprisingly successful

Jaydeep P. Bardhan; Matthew G. Knepley; Mihai Anitescu

2009-01-01T23:59:59.000Z

153

Non-linear inversion modeling for Ultrasound Computer Tomography: transition from soft to hard tissues imaging  

E-Print Network (OSTI)

Non-linear inversion modeling for Ultrasound Computer Tomography: transition from soft to hard, the tomographic procedure used is adapted to broadband data acquired in scattering configurations while, Iterative Approximation, Soft Tissues Imaging, Hard Tissues Imaging, Breast, Bones 1. INTRODUCTION

154

The Quasi-Linear Equilibration of a Thermally Maintained, Stochastically Excited Jet in a Quasigeostrophic Model  

Science Conference Proceedings (OSTI)

A theory for quasigeostrophic turbulence in baroclinic jets is examined in which interaction between the mean flow and the perturbations is explicitly modeled by the nonnormal operator obtained by linearization about the mean flow, while the eddy–...

Timothy Delsole; Brian F. Farrell

1996-07-01T23:59:59.000Z

155

An Estimation of the Bulk Transfer Coefficients for a Bare Soil Surface Using a Linear Model  

Science Conference Proceedings (OSTI)

A linear heat budget model is developed to estimate the daytime means of the bulk transfer coefficients for heat and evaporation efficiency using the daily variation of observational data. The daily variation of shortwave radiation, ground-level ...

Dai Matsushima; Junsei Kondo

1995-04-01T23:59:59.000Z

156

Non-linear approximations for solving 3D-packing MIP models: a ...  

E-Print Network (OSTI)

MINLP solvers up to exploiting linear substructures of the mathematical model. ..... Floudas CA (1995) Nonlinear and Mixed Integer Optimization: Fundamentals and ... (1999) Handbook of Test Problems in Local and Global Optimization.

157

Review of General Circulation Models and Downscaling Techniques  

Science Conference Proceedings (OSTI)

Climate forecasting and climate change projections are currently made with general circulation models (GCMs) that integrate the complex interactions of atmosphere-land-ocean-ice systems to simulate the Earth's climate and make projections of its future change on timescales from decades to centuries. This report reviews the current state of GCMs, including their approaches, limitations, uncertainties, and performance. The report also describes various downscaling techniques used to scale GCM output from c...

2009-07-31T23:59:59.000Z

158

General properties of cosmological models with an Isotropic Singularity  

E-Print Network (OSTI)

Much of the published work regarding the Isotropic Singularity is performed under the assumption that the matter source for the cosmological model is a barotropic perfect fluid, or even a perfect fluid with a $\\gamma$-law equation of state. There are, however, some general properties of cosmological models which admit an Isotropic Singularity, irrespective of the matter source. In particular, we show that the Isotropic Singularity is a point-like singularity and that vacuum space-times cannot admit an Isotropic Singularity. The relationships between the Isotropic Singularity, and the energy conditions, and the Hubble parameter is explored. A review of work by the authors, regarding the Isotropic Singularity, is presented.

Geoffery Ericksson; Susan M. Scott

2003-02-25T23:59:59.000Z

159

Generalized Poland-Scheraga model for DNA hybridization  

E-Print Network (OSTI)

The Poland-Scheraga (PS) model for the helix-coil transition of DNA considers the statistical mechanics of the binding (or hybridization) of two complementary strands of DNA of equal length, with the restriction that only bases with the same index along the strands are allowed to bind. In this paper, we extend this model by relaxing these constraints: We propose a generalization of the PS model which allows for the binding of two strands of unequal lengths $N_{1}$ and $N_{2}$ with unrelated sequences. We study in particular (i) the effect of mismatches on the hybridization of complementary strands (ii) the hybridization of non complementary strands (as resulting from point mutations) of unequal lengths $N_{1}$ and $N_{2}$. The use of a Fixman-Freire scheme scales down the computational complexity of our algorithm from $O(N_{1}^{2}N_{2}^{2})$ to $O(N_{1}N_{2})$.The simulation of complementary strands of a few kbps yields results almost identical to the PS model. For short strands of equal or unequal lengths, the binding displays a strong sensitivity to mutations. This model may be relevant to the experimental protocol in DNA microarrays, and more generally to the molecular recognition of DNA fragments. It also provides a physical implementation of sequence alignments.

Thomas Garel; Henri Orland

2004-02-18T23:59:59.000Z

160

A dark energy model alternative to generalized Chaplygin gas  

E-Print Network (OSTI)

We propose a new fluid model of dark energy for $-1 \\leq \\omega_{\\text{eff}} \\leq 0$ as an alternative to the generalized Chaplygin gas models. The energy density of dark energy fluid is severely suppressed during barotropic matter dominant epochs, and it dominates the universe evolution only for eras of small redshift. From the perspective of fundamental physics, the fluid is a tachyon field with a scalar potential flatter than that of power-law decelerated expansion. Different from the standard $\\Lambda\\text{CDM}$ model, the suggested dark energy model claims that the cosmic acceleration at present epoch can not continue forever but will cease in the near future and a decelerated cosmic expansion will recover afterwards.

Hova, Hoavo

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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

Vibration Model Validation for Linear Collider Detector Platforms  

SciTech Connect

The ILC and CLIC reference designs incorporate reinforced-concrete platforms underneath the detectors so that the two detectors can each be moved onto and off of the beamline in a Push-Pull configuration. These platforms could potentially amplify ground vibrations, which would reduce luminosity. In this paper we compare vibration models to experimental data on reinforced concrete structures, estimate the impact on luminosity, and summarize implications for the design of a reinforced concrete platform for the ILC or CLIC detectors.

Bertsche, Kirk; Amann, J.W.; Markiewicz, T.W.; Oriunno, M.; Weidemann, A.; White, G.; /SLAC

2012-05-16T23:59:59.000Z

162

Battery Life Estimator Manual Linear Modeling and Simulation  

DOE Green Energy (OSTI)

The Battery Life Estimator (BLE) Manual has been prepared to assist developers in their efforts to estimate the calendar life of advanced batteries for automotive applications. Testing requirements and procedures are defined by the various manuals previously published under the United States Advanced Battery Consortium (USABC). The purpose of this manual is to describe and standardize a method for estimating calendar life based on statistical models and degradation data acquired from typical USABC battery testing.

Jon P. Christophersen; Ira Bloom; Ed Thomas; Vince Battaglia

2009-08-01T23:59:59.000Z

163

Modeling and linear function parametric identification for a helicopter main rotor  

Science Conference Proceedings (OSTI)

A model of a helicopter test rotor obtained according to the Euler-Lagrange approach is presented. A simplified linear representation for this model, suitable for control system design, is also proposed. The dynamics of the helicopter test rotor are ... Keywords: helicopter rotors, identification, modeling

José M. Molinar-Monterrubio; Rafael Castro-Linares; Eduardo Licéaga-Castro

2007-05-01T23:59:59.000Z

164

A comparative study of non linear MISO process modelling techniques: application to a chemical reactor  

Science Conference Proceedings (OSTI)

This paper proposes the design and a comparative study of two non linear Multiple Input Single Output (MISO) models. The first, titled Volterra model, is built using Volterra series and the second, named RKHS model, uses the Statistical Learning Theory ... Keywords: RKHS, Volterra, chemical reactor, statistical learning theory

Okba Taouali; Nabiha Saidi; Hassani Messaoud

2009-05-01T23:59:59.000Z

165

Bayesian analysis of multivariate t linear mixed models using a combination of IBF and Gibbs samplers  

Science Conference Proceedings (OSTI)

The multivariate linear mixed model (MLMM) has become the most widely used tool for analyzing multi-outcome longitudinal data. Although it offers great flexibility for modeling the between- and within-subject correlation among multi-outcome repeated ... Keywords: 62F15, 62H12, 91-08, Conditional conjugate priors, Hierarchical models, Inverse Bayes formulas, MCMC, Multivariate longitudinal data

Wan-Lun Wang; Tsai-Hung Fan

2012-02-01T23:59:59.000Z

166

Simulation of Regional Climate Using a Limited Area Model Nested in a General Circulation Model  

Science Conference Proceedings (OSTI)

A Limited Area Model (LAM) is nested in a General Circulation Model (GCM) to simulate the January climate over the western United States. In the nesting procedure, the GCM output is used to provide the initial and lateral atmospheric boundary ...

Filippo Giorgi

1990-09-01T23:59:59.000Z

167

A Simple Biosphere Model (SIB) for Use within General Circulation Models  

Science Conference Proceedings (OSTI)

A simple but realistic biosphere model has been developed for calculating the transfer of energy, mass and momentum between the atmosphere and the vegetated surface of the earth. The model is designed for use in atmospheric general circulation ...

P. J. Sellers; Y. Mintz; Y. C. Sud; A. Dalcher

1986-03-01T23:59:59.000Z

168

General Coldness of Climate Models” and the Second Law: Implications for Modeling the Earth System  

Science Conference Proceedings (OSTI)

Motivated by the circumstantial evidence of the pervasive nature of the “general coldness” of climate model simulations, a theoretical analysis is made of the model response expected from the presence of both physical and aphysical sources of ...

Donald R. Johnson

1997-11-01T23:59:59.000Z

169

Wave Ducting in a Stratified Shear Flow over a Two-Dimensional Mountain. Part I: General Linear Criteria  

Science Conference Proceedings (OSTI)

A linear theory for wave ducting is developed by solving a three-layer, steady-state nonrotating flow over a two-dimensional mountain analytically. The reflection coefficient (Ref), transmission coefficient, and the strongest horizontal wind ...

Ting-An Wang; Yuh-Lang Lin

1999-02-01T23:59:59.000Z

170

Modeling the Interaction between Cumulus Convection and Linear Gravity Waves Using a Limited-Domain Cloud System–Resolving Model  

Science Conference Proceedings (OSTI)

A limited-domain cloud system–resolving model (CSRM) is used to simulate the interaction between cumulus convection and two-dimensional linear gravity waves, a single horizontal wavenumber at a time. With a single horizontal wavenumber, soundings ...

Zhiming Kuang

2008-02-01T23:59:59.000Z

171

Electromagnetic mass-models in general relativity reexamined  

E-Print Network (OSTI)

The problem of constructing a model of an extended charged particle within the context of general relativity has a long and distinguished history. The distinctive feature of these models is that, in some way or another, they require the presence of negative mass in order to maintain stability against Coulomb's repulsion. Typically, the particle contains a core of $negative$ mass surrounded by a positive-mass outer layer, which emerges from the Reissner-Nordstr\\"{o}m field. In this work we show how the Einstein-Maxwell field equations can be used to construct an extended model where the mass is positive everywhere. This requires the principal pressures to be unequal inside the particle. The model is obtained by setting the "effective" matter density, rather than the rest matter density, equal to zero. The Schwarzschild mass of the particle arises from the electrical and gravitational field (Weyl tensor) energy. The model satisfies the energy conditions of Hawking and Ellis. A particular solution that illustrates the results is presented.

J. Ponce de Leon

2003-10-28T23:59:59.000Z

172

[Treatment of cloud radiative effects in general circulation models  

SciTech Connect

This is a renewal proposal for an on-going project of the Department of Energy (DOE)/Atmospheric Radiation Measurement (ARM) Program. The objective of the ARM Program is to improve the treatment of radiation-cloud in GCMs so that reliable predictions of the timing and magnitude of greenhouse gas-induced global warming and regional responses can be made. The ARM Program supports two research areas: (I) The modeling and analysis of data related to the parameterization of clouds and radiation in general circulation models (GCMs); and (II) the development of advanced instrumentation for both mapping the three-dimensional structure of the atmosphere and high accuracy/precision radiometric observations. The present project conducts research in area (I) and focuses on GCM treatment of cloud life cycle, optical properties, and vertical overlapping. The project has two tasks: (1) Development and Refinement of GCM Radiation-Cloud Treatment Using ARM Data; and (2) Validation of GCM Radiation-Cloud Treatment.

Wang, W.C.

1993-11-01T23:59:59.000Z

173

A Linear Model Study of Cross-Equatorial Flow Forced by Summer Monsoon Heat Sources  

Science Conference Proceedings (OSTI)

A linear model of the steady response of a stratified fluid to isolated heat sources on a sphere is developed. The model is used to examine the response to diabatic heating associated with summer monsoon precipitation in India and to low-level ...

Keith D. Sashegyi; John E. Geisler

1987-07-01T23:59:59.000Z

174

Linear driving force models for dynamic adsorption of volatile organic compound traces by porous adsorbent beds  

Science Conference Proceedings (OSTI)

Models for the dynamic adsorption of volatile organic compound (VOC) traces in air are considered. They are based on the linear driving force approximation associated with various adsorption isotherms characteristic of the couple VOC-adsorbent (Langmuir, ... Keywords: Comsol, Dubinin-Astakhov isotherm, Dynamic adsorption modelling, Finite element

Agnès Joly; Alain Perrard

2009-08-01T23:59:59.000Z

175

Optimal Policies and Approximations for a Bayesian Linear Regression Inventory Model  

Science Conference Proceedings (OSTI)

In this paper, we consider a periodic review inventory problem where demand in each period is modeled by linear regression. We use a Bayesian formulation to update the regression parameters as new information becomes available. We find that a state-dependent ... Keywords: Bayesian regression, approximations heuristics, inventory production, stochastic models

Katy S. Azoury; Julia Miyaoka

2009-05-01T23:59:59.000Z

176

Solving large-scale sparse eigenvalue problems and linear systems of equations for accelerator modeling  

SciTech Connect

The solutions of sparse eigenvalue problems and linear systems constitute one of the key computational kernels in the discretization of partial differential equations for the modeling of linear accelerators. The computational challenges faced by existing techniques for solving those sparse eigenvalue problems and linear systems call for continuing research to improve on the algorithms so that ever increasing problem size as required by the physics application can be tackled. Under the support of this award, the filter algorithm for solving large sparse eigenvalue problems was developed at Stanford to address the computational difficulties in the previous methods with the goal to enable accelerator simulations on then the world largest unclassified supercomputer at NERSC for this class of problems. Specifically, a new method, the Hemitian skew-Hemitian splitting method, was proposed and researched as an improved method for solving linear systems with non-Hermitian positive definite and semidefinite matrices.

Gene Golub; Kwok Ko

2009-03-30T23:59:59.000Z

177

Modeling Global Sea Ice with a Thickness and Enthalpy Distribution Model in Generalized Curvilinear Coordinates  

Science Conference Proceedings (OSTI)

A parallel ocean and ice model (POIM) in generalized orthogonal curvilinear coordinates has been developed for global climate studies. The POIM couples the Parallel Ocean Program (POP) with a 12-category thickness and enthalpy distribution (TED) ...

Jinlun Zhang; D. A. Rothrock

2003-05-01T23:59:59.000Z

178

Oceanic Data Analysis Using a General Circulation Model. Part II: A North Atlantic Model  

Science Conference Proceedings (OSTI)

A general circulation model and North Atlantic climatological data of temperature salinity, wind stress, evaporation minus precipitation, and air–sea heat fluxes are used to examine the possibility of solving inverse problems using a full-scale ...

Eli Tziperman; William Carlisle Thacker; Robert Bryan Long; Show-Ming Hwang; Stephen R. Rintoul

1992-12-01T23:59:59.000Z

179

Linear Equatorial Wave Mode Initialization in a Model of the Tropical Pacific Ocean: An Initialization Scheme for Tropical Ocean Models  

Science Conference Proceedings (OSTI)

Data assimilation in models of the tropical oceans can generate spurious equatorial wave modes which are potentially harmful to the model background fields. The amplitudes of these spurious wave modes can often be large and, in general, depend ...

Andrew M. Moore

1990-03-01T23:59:59.000Z

180

A Wave Amplitude Transition in a Quasi-Linear Model with Radiative Forcing and Surface Drag  

Science Conference Proceedings (OSTI)

A quasi-linear two-layer quasigeostrophic ?-plane model of the interaction between a baroclinic jet and a single zonal wavenumber perturbation is used to study the mechanics leading to a wave amplitude bifurcation—in particular, the role of the ...

Orli Lachmy; Nili Harnik

2009-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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 variable spread fuzzy linear regression model with higher explanatory power and forecasting accuracy  

Science Conference Proceedings (OSTI)

Fuzzy regression models have been applied to operational research (OR) applications such as forecasting. Some of previous studies on fuzzy regression analysis obtain crisp regression coefficients for eliminating the problem of increasing spreads for ... Keywords: Forecasting, Fuzzy inference, Fuzzy sets, Linear regression, Mathematical programming

Shih-Pin Chen; Jr-Fong Dang

2008-10-01T23:59:59.000Z

182

Control-relevant Modelling and Linear Analysis of Instabilities in Oxy-fuel Combustion  

E-Print Network (OSTI)

Control-relevant Modelling and Linear Analysis of Instabilities in Oxy-fuel Combustion Dagfinn combustion have been proposed as an alternative to conventional gas turbine cycles for achieving CO2-capture for CO2 sequestration purposes. While combustion instabilities is a problem in modern conventional gas

Foss, Bjarne A.

183

Formant tracking linear prediction model using HMMs and Kalman filters for noisy speech processing  

Science Conference Proceedings (OSTI)

This paper presents a formant tracking linear prediction (LP) model for speech processing in noise. The main focus of this work is on the utilization of the correlation of the energy contours of speech, along the formant tracks, for improved formant ...

Qin Yan; Saeed Vaseghi; Esfandiar Zavarehei; Ben Milner; Jonathan Darch; Paul White; Ioannis Andrianakis

2007-07-01T23:59:59.000Z

184

DDoS attack detection method based on linear prediction model  

Science Conference Proceedings (OSTI)

Distributed denial of service (DDoS) attack is one of the major threats to the current Internet. The IP Flow feature value (FFV) algorithm is proposed based on the essential features of DDoS attacks, such as the abrupt traffic change, flow dissymmetry, ... Keywords: ARMA model, attack features, distributed denial of service, linear prediction, network security

Jieren Cheng; Jianping Yin; Chengkun Wu; Boyun Zhang; Yun Liu

2009-09-01T23:59:59.000Z

185

Decadal Predictability of the Atlantic Ocean in a Coupled GCM: Forecast Skill and Optimal Perturbations Using Linear Inverse Modeling  

Science Conference Proceedings (OSTI)

The decadal predictability of three-dimensional Atlantic Ocean anomalies is examined in a coupled global climate model [the third climate configuration of the Met Office Unified Model (HadCM3)] using a linear inverse modeling (LIM) approach. It ...

Ed Hawkins; Rowan Sutton

2009-07-01T23:59:59.000Z

186

Random generalized linear model: a highly accurate and interpretable ensemble predictor  

E-Print Network (OSTI)

and expO in providing data set GSE2109. Received: 1 Octoberhundreds of genomic data sets, the UCI machine learningtted on each bootstrapped data set. Thus, 100 bootstrapped

Song, Lin; Langfelder, Peter; Horvath, Steve

2013-01-01T23:59:59.000Z

187

Generalized Linear Models for Site-Specific Density Forecasting of U.K. Daily Rainfall  

Science Conference Proceedings (OSTI)

Site-specific probability density rainfall forecasts are needed to price insurance premiums, contracts, and other financial products based on precipitation. The spatiotemporal correlations in U.K. daily rainfall amounts over the Thames Valley are ...

Max A. Little; Patrick E. McSharry; James W. Taylor

2009-03-01T23:59:59.000Z

188

Unified Einstein-Virasoro Master Equation in the General Non-Linear Sigma Model  

E-Print Network (OSTI)

bf d ? aec + ? a e ? d H bec + ? b e (? d H aec ? ? acf H def ? H acf H de f )). (6.12d) (6.12e) The background ?eld

Boer, J. de

2009-01-01T23:59:59.000Z

189

Stratospheric Wind Errors, Initial States and Forecast Skill in the GLAS General Circulation Model  

Science Conference Proceedings (OSTI)

Relations between stratospheric wind errors, initial states and 500 mb skill are investigated using the GLAS general circulation model initialized with FGGE data. Erroneous stratospheric winds are seen in all current general circulation models, ...

J. Tenenbaum

1983-09-01T23:59:59.000Z

190

Application of a Linear Input/Output Model to Tankless Water Heaters  

DOE Green Energy (OSTI)

In this study, the applicability of a linear input/output model to gas-fired, tankless water heaters has been evaluated. This simple model assumes that the relationship between input and output, averaged over both active draw and idle periods, is linear. This approach is being applied to boilers in other studies and offers the potential to make a small number of simple measurements to obtain the model parameters. These parameters can then be used to predict performance under complex load patterns. Both condensing and non-condensing water heaters have been tested under a very wide range of load conditions. It is shown that this approach can be used to reproduce performance metrics, such as the energy factor, and can be used to evaluate the impacts of alternative draw patterns and conditions.

Butcher T.; Schoenbauer, B.

2011-12-31T23:59:59.000Z

191

Open source software maturity model based on linear regression and Bayesian analysis  

E-Print Network (OSTI)

Open Source Software (OSS) is widely used and is becoming a significant and irreplaceable part of the software engineering community. Today a huge number of OSS exist. This becomes a problem if one needs to choose from such a large pool of OSS candidates in the same category. An OSS maturity model that facilitates the software assessment and helps users to make a decision is needed. A few maturity models have been proposed in the past. However, the parameters in the model are assigned not based on experimental data but on human experiences, feelings and judgments. These models are subjective and can provide only limited guidance for the users at the best. This dissertation has proposed a quantitative and objective model which is built from the statistical perspective. In this model, seven metrics are chosen as criteria for OSS evaluation. A linear multiple-regression model is created to assign a final score based on these seven metrics. This final score provides a convenient and objective way for the users to make a decision. The coefficients in the linear multiple-regression model are calculated from 43 OSS. From the statistical perspective, these coefficients are considered random variables. The joint distribution of the coefficients is discussed based on Bayesian statistics. More importantly, an updating rule is established through Bayesian analysis to improve the joint distribution, and thus the objectivity of the coefficients in the linear multiple-regression model, according to new incoming data. The updating rule provides the model the ability to learn and improve itself continually.

Zhang, Dongmin

2007-08-01T23:59:59.000Z

192

A general kinetic model: Kinetics and atomic-scale mechanisms of feldspar dissolution.  

E-Print Network (OSTI)

??This thesis presents a general kinetic model and its application to feldspar dissolution. In the framework of Monte Carlo methods, the model simulates the stochastic… (more)

Zhang, Li

2008-01-01T23:59:59.000Z

193

A Nonlinear Generalized Additive Error Model of Production and Cost  

E-Print Network (OSTI)

Additive Error Model of Production and Cost by Quirino ParisError Model of Production and Cost Quirino Paris* UniversityAdditive Error Model of Production and Cost I. Introduction

Paris, Quirino; Caputo, Michael R.

2004-01-01T23:59:59.000Z

194

The Seasonal Footprinting Mechanism in the CSIRO General Circulation Models  

Science Conference Proceedings (OSTI)

An influence of midlatitude atmospheric variability on interannual ENSO and decadal ENSO-like variability is established and investigated in the Commonwealth Scientific and Industrial Research Organisation (CSIRO) coupled general circulation ...

Daniel J. Vimont; David S. Battisti; Anthony C. Hirst

2003-08-01T23:59:59.000Z

195

Simulation of Mobile Wireless Networks with Accurate Modelling of Non-linear Battery Effects  

E-Print Network (OSTI)

For the simulation of protocols and algorithms of mobile devices, an ideal energy source, i.e. a battery with linear charge and discharge characteristics, is often assumed. However, real batteries like lithium-ion cells show nonlinear behavior, taking Rate Capacity Effect and Recovery Effect into account. The battery model presented by Rakhmatov and Vrudhula models non-linear battery behavior and can be utilized for lifetime optimization strategies since it provides a formal cost metric. A drawback of this lifetime optimization algorithm is that the load profile of the battery has to be known completely in advance. An estimation of battery lifetime at simulation runtime is not feasible. We present an algorithm for a runtime estimation of battery lifetime of lithium-ion cells. Our algorithm allows the integration of a non-linear battery model into network simulation environments for mobile devices. As an example, we describe the integration of our algorithm for battery lifetime estimation into a popular network simulation tool.

D. Timmermann

2003-01-01T23:59:59.000Z

196

Estimation of Sensible and Latent Heat Fluxes from Soil Surface Temperature Using a Linear Air-Land Heat Transfer Model  

Science Conference Proceedings (OSTI)

The authors present a linearized model of the heat transfer between the soil layer and the atmosphere. Using this model, the moisture availability at the surface can be estimated from the diurnal variations of the soil surface temperature and ...

Fujio Kimura; Yugo Shimizu

1994-04-01T23:59:59.000Z

197

Duality, thermodynamics, and the linear programming problem in constraint-based models of metabolism  

E-Print Network (OSTI)

It is shown that the dual to the linear programming problem that arises in constraint-based models of metabolism can be given a thermodynamic interpretation in which the shadow prices are chemical potential analogues, and the objective is to minimise free energy consumption given a free energy drain corresponding to growth. The interpretation is distinct from conventional non-equilibrium thermodynamics, although it does satisfy a minimum entropy production principle. It can be used to motivate extensions of constraint-based modelling, for example to microbial ecosystems.

Patrick B. Warren; Janette L. Jones

2007-02-09T23:59:59.000Z

198

Single-Column Modeling A Stratiform Cloud Parameterization for General Circulation Models  

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

A Stratiform Cloud Parameterization A Stratiform Cloud Parameterization for General Circulation Models S. J. Ghan and L. R. Leung Pacific Northwest Laboratory Richland, WA 99352 C. C. Chuang and J. E. Penner Lawrence Livermore National Laboratory : Livermore. CA 94550 J. McCaa University of Washington Seattle, Washington The crude treatment of clouds in general circulation models (GCMs) is widely recognized as a major limitation in applying these models to predictions of global climate change. The purpose of this project is to develop in GCMs a stratiform cloud parameterization that expresses clouds in terms of bulk microphysical properties and their subgrid variability. Figure 1 summarizes the various cloud variables and their interactions. Precipitating cloud species are distinguished from non-precipitating species, and the liquid phase is

199

Modeling english past tense intuitions with minimal generalization  

Science Conference Proceedings (OSTI)

We describe here a supervised learning model that, given paradigms of related words, learns the morphological and phonological rules needed to derive the paradigm. The model can use its rules to make guesses about how novel forms would be inflected, ...

Adam Albright; Bruce Hayes

2002-07-01T23:59:59.000Z

200

A General Framework for an “Unmixed Layer” PBL Model  

Science Conference Proceedings (OSTI)

Mixed-layer models are computationally efficient, but they do not realistically represent the structure of the boundary layer under many conditions. Many of the deficiencies of the mixed-layer model can be attributed to the assumed flat profiles. ...

Martin J. Otte; John C. Wyngaard

1996-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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

Exact acceleration of linear object detectors  

Science Conference Proceedings (OSTI)

We describe a general and exact method to considerably speed up linear object detection systems operating in a sliding, multi-scale window fashion, such as the individual part detectors of part-based models. The main bottleneck of many of those systems ... Keywords: linear object detection, part-based models

Charles Dubout; Fran$#231;ois Fleuret

2012-10-01T23:59:59.000Z

202

The Canadian Climate Centre Second-Generation General Circulation Model and Its Equilibrium Climate  

Science Conference Proceedings (OSTI)

The Canadian Climate Centre second generation general circulation model (GCMII) is described. The description emphasizes aspects in which the new model differs from the 1984 model (GCMI) as described by Boer and collaborators. Important features ...

N. A. McFarlane; G. J. Boer; J-P. Blanchet; M. Lazare

1992-10-01T23:59:59.000Z

203

Improving the Detection and Tracking of Tropical Cyclones in Atmospheric General Circulation Models  

Science Conference Proceedings (OSTI)

Dynamical seasonal forecasts of tropical storm frequency require robust and efficient algorithms for detection and tracking of tropical storms in atmospheric general circulation models (AGCMs). Tropical storms are generally detected when dynamic ...

Suzana J. Camargo; Stephen E. Zebiak

2002-12-01T23:59:59.000Z

204

The Significance of Thermodynamic Forcing by Cumulus Convection in a General Circulation Model  

Science Conference Proceedings (OSTI)

To assess the effects of cumulus convection on the general circulation of the atmosphere, a medium-resolution, spectral general circulation model was integrated twice for 40 simulated days from identical initial conditions, with and without a ...

Leo J. Donner; Hsaio-Lan Kuo; Eric J. Pitcher

1982-10-01T23:59:59.000Z

205

The Response of a Spectral General Circulation Model to Refinements in Radiative Processes  

Science Conference Proceedings (OSTI)

We present here results and analyses of a series of numerical experiments performed with a spectral general circulation model (GCM). The purpose of the GCM experiments is to examine the role of radiation/cloud processes in the general circulation ...

V. Ramanathan; Eric J. Pitcher; Robert C. Malone; Maurice L. Blackmon

1983-03-01T23:59:59.000Z

206

Combustion Turbine Repair Guidelines: General Electric MS6001 Model B  

Science Conference Proceedings (OSTI)

For more than a decade, EPRI has been developing gas turbine hot section component repair and coating guidelines to assist utilities in the refurbishment of these critical and expensive parts. Utilities, generators, and repair vendors have used these guidelines to perform repairs on blades, turbine vanes, and combustion hardware. Guidelines now exist for a variety of conventional and advanced General Electric, Siemens/Westinghouse, Alstom, and Mitsubishi heavy frame gas turbines. The guidelines in this v...

2009-12-09T23:59:59.000Z

207

Angular momentum transport modeling: achievements of a gyrokinetic quasi-linear approach  

E-Print Network (OSTI)

QuaLiKiz, a model based on a local gyrokinetic eigenvalue solver is expanded to include momentum flux modeling in addition to heat and particle fluxes. Essential for accurate momentum flux predictions, the parallel asymmetrization of the eigenfunctions is successfully recovered by an analytical fluid model. This is tested against self-consistent gyrokinetic calculations and allows for a correct prediction of the ExB shear impact on the saturated potential amplitude by means of a mixing length rule. Hence, the effect of the ExB shear is recovered on all the transport channels including the induced residual stress. Including these additions, QuaLiKiz remains ~10 000 faster than non-linear gyrokinetic codes allowing for comparisons with experiments without resorting to high performance computing. The example is given of momentum pinch calculations in NBI modulation experiments.

Cottier, P; Camenen, Y; Gurcan, O D; Casson, F J; Garbet, X; Hennequin, P; Tala, T

2014-01-01T23:59:59.000Z

208

Oceanic Angular Momentum and Torques in a General Circulation Model  

Science Conference Proceedings (OSTI)

The ocean's angular momentum (M) and torques about the Polar axis are analyzed using output from the global, eddy-resolving model of Semtner and Chervin. Seasonal variability in M is dominated by the annual cycle, whose magnitude appears capable ...

Rui M. Ponte; Richard D. Rosen

1994-09-01T23:59:59.000Z

209

Quasi-Periodic Oscillations in a Symmetric General Circulation Model  

Science Conference Proceedings (OSTI)

Long lime integrations with a symmetric version of the CLAS Climate Model with hydrology have shown that the Hadley circulation has well defined strong and weak episodes. This oscillation of the Hadley circulation seems to occur in two dominant ...

B. N. Gyoswami; J. Shukla

1984-01-01T23:59:59.000Z

210

Parametric Optimization of Linear and Non-Linear Models via Parallel Computing to Enhance Web-Spatial DSS Interactivity  

Science Conference Proceedings (OSTI)

A web based Spatial Decision Support System web SDSS has been implemented in Thessaly, the most significant arable cropping region in Greece, to evaluate energy crop supply. The web SDSS uses an optimization module to support the decision process launching ... Keywords: Common Agricultural Policy CAP, Farm Model, Parallel Programming, Positive Mathematical Programming PMP, Spatial Decision Support Systems SDSS

D. Kremmydas; A. Petsakos; S. Rozakis

2012-01-01T23:59:59.000Z

211

General Equilibrium Model for Economy - Energy - Environment (GEM-E3) |  

Open Energy Info (EERE)

General Equilibrium Model for Economy - Energy - Environment (GEM-E3) General Equilibrium Model for Economy - Energy - Environment (GEM-E3) Jump to: navigation, search Tool Summary Name: General Equilibrium Model for Economy - Energy - Environment (GEM-E3) Agency/Company /Organization: Institute for Prospective Technological Studies, European Commission Joint Research Center Topics: Analysis Tools Complexity/Ease of Use: Moderate Website: ipts.jrc.ec.europa.eu/activities/energy-and-transport/gem-e3/ Related Tools Manual for Quantitative Evaluation of the Co-Benefits Approach to Climate Change Modular Applied General Equilibrium Tool (MAGNET) Environmental Impact and Sustainability Applied General Equilibrium Model (ENVISAGE) ... further results Find Another Tool FIND DEVELOPMENT IMPACTS ASSESSMENT TOOLS An applied general equilibrium model covering the interactions between the

212

Generalized Poland-Scheraga model for supercoiled DNA  

E-Print Network (OSTI)

The Poland-Scheraga (PS) model for the helix-coil transition of DNA considers the statistical mechanics of the thermally induced binding of two complementary strands of DNA. In this paper, we show how to modify the PS model when a torque is applied to the extremities of DNA: We propose a simple model for the energy of twisted DNA and compute the entropy of a loop, subject to angular constraints (supercoiling). The denaturation curves are shifted towards lower or higher temperatures depending on the sign of the torque, and the UV absorption peaks are softened. The properties of supercoiled DNA can be deduced through the use of a numerical Legendre transform. In the homogeneous case, we find that for weak supercoiling, the phenomenological quadratic law relating the torsional energy to the number of unpaired bases is recovered.

Thomas Garel; Henri Orland; Edouard Yeramian

2004-07-28T23:59:59.000Z

213

Transformer modelling for distribution system studies. Part 1; Linear modelling basics  

SciTech Connect

In this paper a distribution transformer modelling procedure is discussed which represents the distribution transformer with a minimum of input data for network, load, and fault studies thereby allowing the transformer to be routinely included as part of the distribution network. The method presented in this paper illustrates how transformer models are developed and how their parameters are estimated.

Gorman, M.J.; Grainger, J.J. (Electric Power Research Center, North Carolina State Univ., Raleigh, NC (US))

1992-04-01T23:59:59.000Z

214

Climate Drift in a Global Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

A global version of the GFDL modular ocean model is forced using conventional restoring boundary conditions (BCs), mixed BCs (i.e., restoring the upper-level temperature but specifying a fixed salt flux), and stochastic fluxes of both heat and ...

Scott B. Power

1995-06-01T23:59:59.000Z

215

Idealized Hot Spot Experiments with a General Circulation Model  

Science Conference Proceedings (OSTI)

Idealized experiments are conducted using a GCM coupled to a 20-m slab ocean model to examine the short-term response to an initial localized positive equatorial SST anomaly, or “hot spot.” A hot spot is imposed upon an aquaplanet with globally ...

Eric D. Maloney; Adam H. Sobel

2007-03-01T23:59:59.000Z

216

January and July Simulations with a Spectral General Circulation Model  

Science Conference Proceedings (OSTI)

We describe the results of January and July simulations carded out with a nine-level spectral model, employing a rhomboidal truncation at wavenumber 15. Sea-surface temperature, sea-ice distribution and solar zenith angle are held constant in ...

Eric J. Pitcher; Robert C. Malone; V. Ramanathan; Maurice L. Blackmon; Kamal Puri; William Bourke

1983-03-01T23:59:59.000Z

217

Generalized admittance matrix models of OTRAs and COAs  

Science Conference Proceedings (OSTI)

This paper proposes new admittance matrix models to approach the behavior of fully-differential Operational Transresistance Amplifiers (OTRAs) and Current Operational Amplifiers (COAs). The infinity-variables method is used in order to derive the new ... Keywords: Admittance matrix, Current operational amplifier, Nullor, Operational transresistance amplifier, Symbolic analysis

C. Sánchez-López; F. V. Fernández; E. Tlelo-Cuautle

2010-08-01T23:59:59.000Z

218

Modeling DFIG Using General Vector Representation in the Presence of Harmonics  

Science Conference Proceedings (OSTI)

In this paper, a doubly-fed induction generator (DFIG) wind turbine is modeled by using the general vector representation of voltage, current and magnetic flux in the presence of harmonics. The general vector representation provides insights into how ... Keywords: wind turbine, harmonics, general vector form, DFIG

Ziqiao Liu, Ahmed Abu-Hajar, David Wenzhong Gao

2013-04-01T23:59:59.000Z

219

A semiempirical linear model of indirect, flat-panel x-ray detectors  

Science Conference Proceedings (OSTI)

Purpose: It is important to understand signal and noise transfer in the indirect, flat-panel x-ray detector when developing and optimizing imaging systems. For optimization where simulating images is necessary, this study introduces a semiempirical model to simulate projection images with user-defined x-ray fluence interaction. Methods: The signal and noise transfer in the indirect, flat-panel x-ray detectors is characterized by statistics consistent with energy-integration of x-ray photons. For an incident x-ray spectrum, x-ray photons are attenuated and absorbed in the x-ray scintillator to produce light photons, which are coupled to photodiodes for signal readout. The signal mean and variance are linearly related to the energy-integrated x-ray spectrum by empirically determined factors. With the known first- and second-order statistics, images can be simulated by incorporating multipixel signal statistics and the modulation transfer function of the imaging system. To estimate the semiempirical input to this model, 500 projection images (using an indirect, flat-panel x-ray detector in the breast CT system) were acquired with 50-100 kilovolt (kV) x-ray spectra filtered with 0.1-mm tin (Sn), 0.2-mm copper (Cu), 1.5-mm aluminum (Al), or 0.05-mm silver (Ag). The signal mean and variance of each detector element and the noise power spectra (NPS) were calculated and incorporated into this model for accuracy. Additionally, the modulation transfer function of the detector system was physically measured and incorporated in the image simulation steps. For validation purposes, simulated and measured projection images of air scans were compared using 40 kV/0.1-mm Sn, 65 kV/0.2-mm Cu, 85 kV/1.5-mm Al, and 95 kV/0.05-mm Ag. Results: The linear relationship between the measured signal statistics and the energy-integrated x-ray spectrum was confirmed and incorporated into the model. The signal mean and variance factors were linearly related to kV for each filter material (r{sup 2} of signal mean to kV: 0.91, 0.93, 0.86, and 0.99 for 0.1-mm Sn, 0.2-mm Cu, 1.5-mm Al, and 0.05-mm Ag, respectively; r{sup 2} of signal variance to kV: 0.99 for all four filters). The comparison of the signal and noise (mean, variance, and NPS) between the simulated and measured air scan images suggested that this model was reasonable in predicting accurate signal statistics of air scan images using absolute percent error. Overall, the model was found to be accurate in estimating signal statistics and spatial correlation between the detector elements of the images acquired with indirect, flat-panel x-ray detectors. Conclusions: The semiempirical linear model of the indirect, flat-panel x-ray detectors was described and validated with images of air scans. The model was found to be a useful tool in understanding the signal and noise transfer within indirect, flat-panel x-ray detector systems.

Huang, Shih-Ying; Yang Kai; Abbey, Craig K.; Boone, John M. [Department of Biomedical Engineering, University of California, Davis, California, One Shields Avenue, Davis, California 95616 (United States) and Department of Radiology, University of California, Davis, Medical Center, 4860 Y Street, Ambulatory Care Center Suite 0505, Sacramento, California 95817 (United States); Department of Radiology, University of California, Davis, Medical Center, 4860 Y Street, Ambulatory Care Center Suite 0505, Sacramento, California 95817 (United States); Department of Psychological and Brain Sciences, University of California, Santa Barbara, California 92106 (United States); Department of Biomedical Engineering, University of California, Davis, California, One Shields Avenue, Davis, California 95616 (United States) and Department of Radiology, University of California, Davis, Medical Center, 4860 Y Street, Ambulatory Care Center Suite 3100, Sacramento, California 95817 (United States)

2012-04-15T23:59:59.000Z

220

A Direct Inverse Method for Inferring Open Boundary Conditions of a Finite-Element Linear Harmonic Ocean Circulation Model  

Science Conference Proceedings (OSTI)

A direct inverse method is presented for inferring numerical model open boundary conditions from interior observational data. The dynamical context of the method is the frequency-domain 3D linear shallow water equations. A set of weight matrices ...

Zhigang Xu

1998-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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

Possibility of Skill Forecast Based on the Finite-Time Dominant Linear Solutions for a Primitive Equation Regional Forecast Model  

Science Conference Proceedings (OSTI)

The possibility of using forecast errors originating from the finite-time dominant linear modes for the prediction of forecast skill for a primitive equation regional forecast model is studied. This is similar to the method for skill prediction ...

Tomislava Vuki?evi?

1993-06-01T23:59:59.000Z

222

The impact of parallel programming models on the performance of iterative linear solvers for finite element applications  

Science Conference Proceedings (OSTI)

Parallel iterative linear solvers for unstructured grids in FEM applications, originally developed for the Earth Simulator (ES), are ported to various types of parallel computer. The performance of flat MPI and hybrid parallel programming models is compared ...

Kengo Nakajima

2006-06-01T23:59:59.000Z

223

Effect of Cloud-Radiation Feedback on the Climate of a General Circulation Model  

Science Conference Proceedings (OSTI)

The General Circulation Model (GCM) of the Goddard Laboratory for Atmospheric Sciences (GLAS) was integrated for 107 days starting from the initial conditions of 15 May. In this experiment the clouds dynamically generated by the model affect the ...

J. Shukla; Y. Sud

1981-11-01T23:59:59.000Z

224

The Effects of Topography on the Atmospheric Energetics in. a Low-Resolution General Circulation Model  

Science Conference Proceedings (OSTI)

An analysis is made of the effect of orography on the atmospheric energetics in a low-resolution general circulation model to determine the temporal and scale dependency of these effects. The numerical model is a global, spectral, primitive ...

Yun-Qi Ni; Bette L. Otto-Bliesner; David D. Houghton

1986-07-01T23:59:59.000Z

225

Climatology of the SKYHI Troposphere–Stratosphere–Mesosphere General Circulation Model  

Science Conference Proceedings (OSTI)

The long-term mean climatology obtained from integrations conducted with different resolutions of the GFDL “SKYHI” finite-difference general circulation model is examined. A number of improvements that have been made recently in the model are ...

Kevin Hamilton; R. John Wilson; J. D. Mahlman; L. J. Umscheid

1995-01-01T23:59:59.000Z

226

Effects of Transient Eddies on Blocking Flows: General Circulation Model Experiments  

Science Conference Proceedings (OSTI)

Prediction of blocking flows by a comprehensive general circulation model is still not satisfactory. A large portion of the unskillful forecasts can be traced to the model's inability to predict the evolution of blocking beyond a few days into ...

Wilbur Y. Chen; Hann-ming Henry Juang

1992-05-01T23:59:59.000Z

227

Equatorial Superrotation and Maintenance of the General Circulation in Two-Level Models  

Science Conference Proceedings (OSTI)

Suarez and Duffy have noted an interesting bifurcation in a two-level gridpoint general circulation model when strong tropical heating is imposed. This bifurcation results in a model climatology with strong upper-level westerlies in the tropics. ...

R. Saravanan

1993-05-01T23:59:59.000Z

228

Oceanic Data Analysis Using a General Circulation Model. Part I: Simulations  

Science Conference Proceedings (OSTI)

This paper deals with the solution of inverse problems involving complex numerical models of the oceanic general circulation and large datasets. The goal of these inverse problems is to find values for model inputs consistent with a steady ...

Eli Tziperman; William Carlisle Thacker; Robert Bryan Long; Show-Ming Hwang

1992-12-01T23:59:59.000Z

229

Constraining a North Atlantic Ocean General Circulation Model with Chlorofluorocarbon Observations  

Science Conference Proceedings (OSTI)

Measurements of anthropogenic tracers such as chlorofluorocarbons and tritium must be quantitatively combined with ocean general circulation models as a component of systematic model development. The authors have developed and tested an inverse ...

S. L. Gray; T. W. N. Haine

2001-05-01T23:59:59.000Z

230

A General Circulation Experiment with a Coupled Atmosphere, Ocean and Sea Ice Model  

Science Conference Proceedings (OSTI)

This paper describes the construction and results of a comprehensive, three-dimensional general circulation model (GCM) of the earth's climate. The model, developed at the National Center for Atmospheric Research (NCAR), links separate existing ...

Warren M. Washington; Albert J. Semtner Jr.; Gerald A. Meehl; David J. Knight; Thomas A. Mayer

1980-12-01T23:59:59.000Z

231

Simulations of Mid-Holocene Climate Using an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

The authors describe a first paleoclimatological application of the Canadian Centre for Climate Modelling and Analysis atmospheric general circulation model (AGCM) to simulate the climate state 6000 calendar years before present (6 kyr BP). ...

G. Vettoretti; W. R. Peltier; N. A. McFarlane

1998-10-01T23:59:59.000Z

232

Dynamical Core of an Atmospheric General Circulation Model on a Yin–Yang Grid  

Science Conference Proceedings (OSTI)

The three-dimensional dynamical core of an atmospheric general circulation model employing Yin–Yang grid is developed and examined. Benchmark test cases based on the shallow-water model configuration are first performed to examine the validity of ...

Yuya Baba; Keiko Takahashi; Takeshi Sugimura; Koji Goto

2010-10-01T23:59:59.000Z

233

Adjoint Sensitivity of an Ocean General Circulation Model to Bottom Topography  

Science Conference Proceedings (OSTI)

Bottom topography, or more generally the geometry of the ocean basins, is an important ingredient in numerical ocean modeling. With the help of an adjoint model, it is shown that scalar diagnostics or objective functions in a coarse-resolution ...

Martin Losch; Patrick Heimbach

2007-02-01T23:59:59.000Z

234

Surface Energy Balances of Three General Circulation Models: Implications for Simulating Regional Climate Change  

Science Conference Proceedings (OSTI)

We examine surface energy balances simulated by three general circulation models for current climatic boundary conditions and for an atmosphere with twice current levels of CO2. Differences between model simulations provide a measure of ...

William J. Gutowski Jr.; David S. Gutzler; Wei-Chyung Wang

1991-02-01T23:59:59.000Z

235

Potential Predictability and AMIP Implications of Midlatitude Climate Variability in Two General Circulation Models  

Science Conference Proceedings (OSTI)

Ensembles of extended Atmospheric Model Intercomparison Project (AMIP) runs from the general circulation models of the National Centers for Environmental Prediction (formerly the National Meteorological Center) and the Max-Planck Institute (...

T. P. Barnett; K. Arpe; L. Bengtsson; M. Ji; A. Kumar

1997-09-01T23:59:59.000Z

236

Testing the Annular Mode Autocorrelation Time Scale in Simple Atmospheric General Circulation Models  

Science Conference Proceedings (OSTI)

A new diagnostic for measuring the ability of atmospheric models to reproduce realistic low-frequency variability is introduced in the context of Held and Suarez’s 1994 proposal for comparing the dynamics of different general circulation models. ...

Edwin P. Gerber; Sergey Voronin; Lorenzo M. Polvani

2008-04-01T23:59:59.000Z

237

Generalized Iterative Annealing Model for the action of RNA chaperones  

E-Print Network (OSTI)

As a consequence of the rugged landscape of RNA molecules their folding is described by the kinetic partitioning mechanism according to which only a small fraction ($\\phi_F$) reaches the folded state while the remaining fraction of molecules is kinetically trapped in misfolded intermediates. The transition from the misfolded states to the native state can far exceed biologically relevant time. Thus, RNA folding in vivo is often aided by protein cofactors, called RNA chaperones, that can rescue RNAs from a multitude of misfolded structures. We consider two models, based on chemical kinetics and chemical master equation, for describing assisted folding. In the passive model, applicable for class I substrates, transient interactions of misfolded structures with RNA chaperones alone are sufficient to destabilize the misfolded structures, thus entropically lowering the barrier to folding. For this mechanism to be efficient the intermediate ribonucleoprotein (RNP) complex between collapsed RNA and protein cofactor ...

Hyeon, Changbong

2013-01-01T23:59:59.000Z

238

General model of oil shale pyrolysis. Revision 1  

DOE Green Energy (OSTI)

A mathematical model for pyrolysis of Green River oil shale is developed from previous experiments on oil, water, and gas evolution and oil cracking over a wide range of pyrolysis conditions. Reactions included are evolution of 5 gas species, oil, and water from kerogen, clay dehydration, oil coking and cracking, and evolution of H/sub 2/ and CH/sub 4/ from char. Oil is treated in eleven boiling point fractions in order to treat the competition between oil coking and evaporation, and to evalute the effect of oil cracking on the boiling point distribution of the oil. The kinetics and product yields calculated by the model are compared to experimental results for pyrolysis conditions ranging from isothermal fluid-bed to high-pressure slow-heating-rate retorting.

Burnham, A.K.; Braun, R.L.

1984-04-01T23:59:59.000Z

239

Generalized Iterative Annealing Model for the action of RNA chaperones  

E-Print Network (OSTI)

As a consequence of the rugged landscape of RNA molecules their folding is described by the kinetic partitioning mechanism according to which only a small fraction ($\\phi_F$) reaches the folded state while the remaining fraction of molecules is kinetically trapped in misfolded intermediates. The transition from the misfolded states to the native state can far exceed biologically relevant time. Thus, RNA folding in vivo is often aided by protein cofactors, called RNA chaperones, that can rescue RNAs from a multitude of misfolded structures. We consider two models, based on chemical kinetics and chemical master equation, for describing assisted folding. In the passive model, applicable for class I substrates, transient interactions of misfolded structures with RNA chaperones alone are sufficient to destabilize the misfolded structures, thus entropically lowering the barrier to folding. For this mechanism to be efficient the intermediate ribonucleoprotein (RNP) complex between collapsed RNA and protein cofactor should have optimal stability. We also introduce an active model (suitable for stringent substrates with small $\\phi_F$), which accounts for the recent experimental findings on the action of CYT-19 on the group I intron ribozyme, showing that RNA chaperones does not discriminate between the misfolded and the native states. In the active model, the RNA chaperone system utilizes chemical energy of ATP hydrolysis to repeatedly bind and release misfolded and folded RNAs, resulting in substantial increase of yield of the native state. The theory outlined here shows, in accord with experiments, that in the steady state the native state does not form with unit probability.

Changbong Hyeon; D. Thirumalai

2013-06-17T23:59:59.000Z

240

System Advisor Model, SAM 2011.12.2: General Description  

DOE Green Energy (OSTI)

This document describes the capabilities of the U.S. Department of Energy and National Renewable Energy Laboratory's System Advisor Model (SAM), Version 2011.12.2, released on December 2, 2011. SAM is software that models the cost and performance of renewable energy systems. Project developers, policy makers, equipment manufacturers, and researchers use graphs and tables of SAM results in the process of evaluating financial, technology, and incentive options for renewable energy projects. SAM simulates the performance of solar, wind, geothermal, biomass, and conventional power systems. The financial model can represent financing structures for projects that either buy and sell electricity at retail rates (residential and commercial) or sell electricity at a price determined in a power purchase agreement (utility). Advanced analysis options facilitate parametric, sensitivity, and statistical analyses, and allow for interfacing SAM with Microsoft Excel or with other computer programs. SAM is available as a free download at http://sam.nrel.gov. Technical support and more information about the software are available on the website.

Gilman, P.; Dobos, A.

2012-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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.


241

A general framework for surface modeling using geometric partial differential equations  

Science Conference Proceedings (OSTI)

In this paper, a general framework for surface modeling using geometric partial differential equations (PDEs) is presented. Starting with a general integral functional, we derive an Euler-Lagrange equation and then a geometric evolution equation (also ... Keywords: Geometric PDEs, Surface modeling, Triangular surface mesh

Guoliang Xu; Qin Zhang

2008-03-01T23:59:59.000Z

242

Relative Risk Model for Transmission and Distribution Electric Infrastructure (General RRM) Version 1.0  

Science Conference Proceedings (OSTI)

The General Relative Risk Model (RRM) is a decision support tool that provides a platform for the assessment of relative risks (human, ecological, and financial) associated with releases of dielectric fluids from a wide range of transmission and distribution (T&D) electrical equipment.  The General RRM is designed to model the relative risk of a given equipment portfolio (i.e., a user-defined grouping of T&D equipment) owned and operated by a utility.  The General RRM evaluates the ...

2012-11-28T23:59:59.000Z

243

Existence of Equilibrium Points and their Linear Stability in the Generalized Photogravitational Chermnykh-Like Problem with Power-law Profile  

E-Print Network (OSTI)

We consider the modified restricted three body problem with power-law density profile of disk, which rotates around the center of mass of the system with perturbed mean motion. Using analytical and numerical methods we have found equilibrium points and examined their linear stability. We have also found the zero velocity surfaces for the present model. In addition to five equilibrium points there is a new equilibrium point on the line joining the two primaries. It is found that $L_2$ and $L_3$ are stable for some values of inner and outer radius of the disk while collinear points are unstable, but $L_4$ is conditionally stable for mass ratio less than that of Routh's critical value. Lastly we have obtained the effects of radiation pressure, oblateness and mass of the disk.

Badam Singh Kushvah; Ram Kishor; Uday Dolas

2011-07-27T23:59:59.000Z

244

Variability of the Thermohaline Circulation in an Ocean General Circulation Model Coupled to an Atmospheric Energy Balance Model  

Science Conference Proceedings (OSTI)

The variability of the ocean’s thermohaline circulation in an oceanic general circulation model (OGCM) coupled to a two-dimensional atmospheric energy balance model (EBM) is examined. The EBM calculates air temperatures by balancing heat fluxes, ...

David W. Pierce; K-Y. Kim; Tim P. Barnett

1996-05-01T23:59:59.000Z

245

Generalized LTB model with Inhomogeneous Isotropic Dark Energy: Observational Constraints  

E-Print Network (OSTI)

We consider on-center and off-center observers in an inhomogeneous, spherically symmetric, isocurvature (flat) concentration of dark energy with typical size of a few Gpc. Such a concentration could be produced e.g. by a recently formed global monopole with core size that approaches the Hubble scale. In this case we would have what may be called `topological quintessence' in analogy with the well-known topological inflation. We show that the minimum comoving radius r_{0min} of such a dark energy inhomogeneity that is consistent with the Union2 Type Ia supernovae (SnIa) data at the 3\\sigma level is r_{0min}\\simeq 1.8 Gpc. As expected, the best-fit fractional dark energy density at the center, \\Omega_X,in, approaches the corresponding LCDM value \\Omega_X,in =0.73 for large enough values of the inhomogeneity radius r_0 (r_0 > 4Gpc). Using the Union2 data, we show that the maximum allowed shift r_{obs-max} of the observer from the center of the inhomogeneity is about 0.7 r_0 which respects the Copernican principle. The model naturally predicts the existence of a preferred axis and alignment of the low CMB multipoles. However, the constraints on r_{obs-max} coming from the magnitude of the CMB dipole remain a severe challenge to the Copernican principle and lead to r_{obs-max}< 110 Mpc even for an inhomogeneity radius as large as r_0=7 Gpc.

J. Grande; L. Perivolaropoulos

2011-03-21T23:59:59.000Z

246

The Component Slope Linear Model for Calculating Intensive Partial Molar Properties: Application to Waste Glasses  

SciTech Connect

Partial molar properties are the changes occurring when the fraction of one component is varied while the fractions of all other component mole fractions change proportionally. They have many practical and theoretical applications in chemical thermodynamics. Partial molar properties of chemical mixtures are difficult to measure because the component mole fractions must sum to one, so a change in fraction of one component must be offset with a change in one or more other components. Given that more than one component fraction is changing at a time, it is difficult to assign a change in measured response to a change in a single component. In this study, the Component Slope Linear Model (CSLM), a model previously published in the statistics literature, is shown to have coefficients that correspond to the intensive partial molar properties. If a measured property is plotted against the mole fraction of a component while keeping the proportions of all other components constant, the slope at any given point on a graph of this curve is the partial molar property for that constituent. Actually plotting this graph has been used to determine partial molar properties for many years. The CSLM directly includes this slope in a model that predicts properties as a function of the component mole fractions. This model is demonstrated by applying it to the constant pressure heat capacity data from the NaOH-NaAl(OH{sub 4}H{sub 2}O system, a system that simplifies Hanford nuclear waste. The partial molar properties of H{sub 2}O, NaOH, and NaAl(OH){sub 4} are determined. The equivalence of the CSLM and the graphical method is verified by comparing results detennined by the two methods. The CSLM model has been previously used to predict the liquidus temperature of spinel crystals precipitated from Hanford waste glass. Those model coefficients are re-interpreted here as the partial molar spinel liquidus temperature of the glass components.

Reynolds, Jacob G. [Washington River Protection Solutions, Richland, WA (United States)

2013-01-11T23:59:59.000Z

247

Analysis of the GISS GCM Response to a Subtropical Sea Surface Temperature Anomaly Using a Linear Model  

Science Conference Proceedings (OSTI)

The GISS general circulation model (GCM) is used to investigate the influence of a positive sea surface temperature (SST) anomaly in the subtropical North Pacific on the Northern Hemisphere wintertime circulation. As the set of model data is ...

Claude Frankignoul; Antoine Molin

1988-12-01T23:59:59.000Z

248

Linear modeling and simulation of low-voltage electric system for single-point vulnerability assessment of military installation  

Science Conference Proceedings (OSTI)

This paper describes the formulation and development of a linear model to support the single-point vulnerability assessment of electric distribution systems at existing and future U.S. Department of Defense (DoD) military sites. The model uses flow sensitivity ...

Edgar C. Portante; Thomas N. Taxon; James A. Kavicky; Tarek Abdallah; Timothy K. Perkins

2008-12-01T23:59:59.000Z

249

General and Partial Equilibrium Modeling of Sectoral Policies to Address Climate Change in the United States  

SciTech Connect

This document provides technical documentation for work using detailed sectoral models to calibrate a general equilibrium analysis of market and non-market sectoral policies to address climate change. Results of this work can be found in the companion paper, ?Modeling Costs of Economy-wide versus Sectoral Climate Policies Using Combined Aggregate-Sectoral Models?.

Pizer, William; Burtraw, Dallas; Harrington, Winston; Newell, Richard; Sanchirico, James; Toman, Michael

2003-03-31T23:59:59.000Z

250

Study of Higgs self couplings of a supersymmetric $E_6$ model at the International Linear Collider  

E-Print Network (OSTI)

We study the Higgs self couplings of a supersymmetric $E_6$ model that has two Higgs doublets and two Higgs singlets. The lightest scalar Higgs boson in the model may be heavier than 112 GeV, at the one-loop level, where the negative results for the Higgs search at the LEP2 experiments are taken into account. The contributions from the top and scalar top quark loops are included in the radiative corrections to the one-loop mass of the lightest scalar Higgs boson, in the effective potential approximation. The effect of the Higgs self couplings may be observed in the production of the lightest scalar Higgs bosons in $e^+e^-$ collisions at the International Linear Collider (ILC) via double Higgs-strahlung process. For the center of mass energy of 500 GeV with the integrated luminosity of 500 fb$^{-1}$ and the efficiency of 20 %, we expect that at least 5 events of the lightest scalar Higgs boson may be produced at the ILC via double Higgs-strahlung process.

S. W. Ham; Kideok Han; Jungil Lee; S. K. Oh

2009-11-30T23:59:59.000Z

251

Tropical Intraseasonal Oscillations Appearing in a GFDL General Circulation Model and FGGE Data. Part II: Structure  

Science Conference Proceedings (OSTI)

Space-time spectral and filter analyses are made of the structure of the tropical intraseasonal oscillations appearing in a GFDL 30-wavenumber spectral general circulation model and the FGGE IIIb data set.

Y. Hayashi; D. G. Golder

1988-11-01T23:59:59.000Z

252

Space-Time Spectral Structure of a GLAS General Circulation Model and a Comparison with Observations  

Science Conference Proceedings (OSTI)

The wavenumber-frequency spectra of geopotential height have been computed from a winter simulation of a GLAS general circulation model, and are compared to the spectra obtained from 15 winters of observed analyses. The variances in several ...

David M. Straus; J. Shukla

1981-05-01T23:59:59.000Z

253

Regional Climates in the GISS General Circulation Model: Surface Air Temperature  

Science Conference Proceedings (OSTI)

One of the more viable research techniques into global climate change for the purpose of understanding the consequent environmental impacts is based on the use of general circulation models (GCMs). However, GCMs are currently unable to reliably ...

Bruce Hewitson

1994-02-01T23:59:59.000Z

254

Forcing and Sampling of Ocean General Circulation Models: Impact of High-Frequency Motions  

Science Conference Proceedings (OSTI)

Significant inertial oscillations are present in all primitive equation ocean general circulation models when they are forced with high-frequency (period order of days) wind stress fields. At specific latitudes the energy of the wind stress ...

Steven R. Jayne; Robin Tokmakian

1997-06-01T23:59:59.000Z

255

Land Surface Hydrology Parameterization for Atmospheric General Circulation models Including Subgrid Scale Spatial Variability  

Science Conference Proceedings (OSTI)

Parameterizations are developed for the representation of subgrid hydrologic processes in atmospheric general circulation models. Reasonable a priori probability density functions of the spatial variability of soil moisture and of precipitation ...

D. Entekhabi; P. S. Eagleson

1989-08-01T23:59:59.000Z

256

The Implementation and Validation of Improved Land-Surface Hydrology in an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

New land-surface hydrologic parameterizations are implemented into the NASA Goddard Institute for Space Studies (GISS) General Circulation Model (GCM). These parameterizations are: 1) runoff and evapotranspiration functions that include the ...

Kevin D. Johnson; Dara Entekhabi; Peter S. Eagleson

1993-06-01T23:59:59.000Z

257

A Comparison of General Circulation Model Predictions to Sand Drift and Dune Orientations  

Science Conference Proceedings (OSTI)

The growing concern over climate change and desertification stresses the importance of aeolian process prediction. In this paper the use of a general circulation model to predict current aeolian features is examined. A GCM developed at NASA/...

Dan G. Blumberg; Ronald Greeley

1996-12-01T23:59:59.000Z

258

Integrated and Spectral Energetics Studies of the GLAS General Circulation Model  

Science Conference Proceedings (OSTI)

Integrated and spectral energetics of the Goddard Laboratory for Atmospheric Sciences (GLAS) general circulation model are compared with observations and examined when subdivided beyond hemispheric integrals. In the monthly mean zonal averages, ...

J. Tenenbaum

1982-08-01T23:59:59.000Z

259

Greenhouse Gas–induced Climate Change Simulated with the CCC Second-Generation General Circulation Model  

Science Conference Proceedings (OSTI)

The Canadian Climate Centre second-generation atmospheric general circulation model coupled to a mixed-layer ocean incorporating thermodynamic sea ice is used to simulate the equilibrium climate response to a doubling of C02. Features of the ...

G. J. Boer; N. A. McFarlane; M. Lazare

1992-10-01T23:59:59.000Z

260

The Dynamics of an Explosively Developing Cyclone Simulated by a General Circulation Model  

Science Conference Proceedings (OSTI)

The synoptic structure and dynamics of an explosively developing winter extratropical cyclone simulated by NCAR’s CCM2 general circulation model is examined and compared with cyclones that have developed explosively in nature. The primary ...

Karen D. Walthorn; Phillip J. Smith

1998-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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

An Objective Method for Determining the Generalized Transport Tensor for Two-Dimensional Eulerian Models  

Science Conference Proceedings (OSTI)

An objective method for deriving the components of a generalized transport tensor for a two-dimensional model is presented. The method uses representative meridional and vertical velocities and thermodynamic scalars at a uniform grid to reduce ...

Edwin F. Danielsen

1981-07-01T23:59:59.000Z

262

The Zonally Averaged Transport Characteristics of the GFDL General Circulation/Transport Model  

Science Conference Proceedings (OSTI)

The GFDL general circulation/tracer model has been used to generate the transport coefficients required in two-dimensional (zonally averaged) transport formulations. This was done by assuming a flux-gradient relationship and then, given gradient ...

R. A. Plumb; J. D. Mahlman

1987-01-01T23:59:59.000Z

263

A Potential Predictability Study Conducted with an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

This paper describes a potential predictability study on the results of a 20.5 year simulation conducted with the Canadian Climate Centre (CCC) General Circulation Model (GCM). The CCC GCM is an atmosphere GCM with surface hydrology, soil ...

F. W. Zwiers

1987-12-01T23:59:59.000Z

264

Tropical Cyclone Prediction Using a Barotropic Model Initialized by a Generalized Inverse Method  

Science Conference Proceedings (OSTI)

A nested, nondivergent barotropic numerical weather prediction model for forecasting tropical cyclone motion out to 48 h is initialized at time t = 0 by assimilating data from the preceding 24 h. The assimilation scheme finds the generalized ...

A. F. Bennett; L. M. Leslie; C. R. Hagelberg; P. E. Powers

1993-06-01T23:59:59.000Z

265

A Comparison of Radiation Variables Calculated in the UCLA General Circulation Model to Observations  

Science Conference Proceedings (OSTI)

Comparisons are made between the spatial patterns of solar and thermal fluxes of radiation calculated by the UCLA general circulation model and observations. The latter include estimates at the Pacific Ocean surface of the climatological averages ...

Bryan C. Weare

1988-05-01T23:59:59.000Z

266

The Local Balances of Vorticity and Heat for Blocking Anticyclones in a Spectral General Circulation Model  

Science Conference Proceedings (OSTI)

Blocking anticyclones that appear in perpetual January simulations of a spectral general circulation model are examined. Blocks in three geographical regions are studied: the North Pacific, the North Atlantic and western North America. Local time-...

Steven L. Mullen

1986-07-01T23:59:59.000Z

267

Understanding El Niño in Ocean–Atmosphere General Circulation Models: Progress and Challenges  

Science Conference Proceedings (OSTI)

Determining how El Niño and its impacts may change over the next 10 to 100 years remains a difficult scientific challenge. Ocean–atmosphere coupled general circulation models (CGCMs) are routinely used both to analyze El Niño mechanisms and ...

Eric Guilyardi; Andrew Wittenberg; Alexey Fedorov; Mat Collins; Chunzai Wang; Antonietta Capotondi; Geert Jan van Oldenborgh; Tim Stockdale

2009-03-01T23:59:59.000Z

268

Toward a Physically Based Gravity Wave Source Parameterization in a General Circulation Model  

Science Conference Proceedings (OSTI)

Middle atmospheric general circulation models (GCMs) must employ a parameterization for small-scale gravity waves (GWs). Such parameterizations typically make very simple assumptions about gravity wave sources, such as uniform distribution in ...

Jadwiga H. Richter; Fabrizio Sassi; Rolando R. Garcia

2010-01-01T23:59:59.000Z

269

The January and July Performance of the OSU Two-Level Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

A modified version of the two-level atmospheric general circulation model has been developed and used in the simulation of January and July global climates. The overall physical and numerical formulation of this Oregon State University (OSU) ...

Michael E. Schlesinger; W. Lawrence Gates

1980-09-01T23:59:59.000Z

270

Interannual to Decadal Predictability in a Coupled Ocean–Atmosphere General Circulation Model  

Science Conference Proceedings (OSTI)

The predictability of the coupled ocean–atmosphere climate system on interannual to decadal timescales has been studied by means of ensemble forecast experiments with a global coupled ocean–atmosphere general circulation model. Over most parts of ...

A. Grötzner; M. Latif; A. Timmermann; R. Voss

1999-08-01T23:59:59.000Z

271

The Sensitivity of Surface Energy Balance to Convective Parameterization in a General Circulation Model  

Science Conference Proceedings (OSTI)

This study investigates the interaction between convection and the surface energy fluxes, and its sensitivity to convective parameterization schemes using a general circulation model. Two simulations of the global circulation averaged annually ...

Guang Jun Zrkng

1995-05-01T23:59:59.000Z

272

Parameterization of PBL Processes in an Atmospheric General Circulation Model: Description and Preliminary Assessment  

Science Conference Proceedings (OSTI)

This paper presents the basic features of a newly developed planetary boundary layer (PBL) parameterization, and the performance assessment of a version of the University of California, Los Angeles (UCLA), Atmospheric General Circulation Model (...

Celal S. Konor; Gabriel Cazes Boezio; Carlos R. Mechoso; Akio Arakawa

2009-03-01T23:59:59.000Z

273

Thermohaline Oscillations Induced by Strong Steady Salinity Forcing of Ocean General Circulation Models  

Science Conference Proceedings (OSTI)

A series of numerical experiments is conducted with a three-dimensional ocean general circulation model and a two-dimensional counterpart both designed for efficient integration over diffusive (millennial) time scales. With strong steady salinity ...

Michael Winton; E. S. Sarachik

1993-07-01T23:59:59.000Z

274

Parallel Simulation for a Fish Schooling Model on a General-Purpose Graphics Processing Unit  

E-Print Network (OSTI)

Model on a General-Purpose Graphics Processing Unit Hong LiThe current generation of graphics processing units is well-we will describe how a Graphics Pro- cessor Unit (GPU) can

Li, Hong; Kolpas, Allison; Petzold, Linda; Moehlis, J

2009-01-01T23:59:59.000Z

275

A January Angular Momentum Balance in the OSU Two-Level Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

The atmospheric angular momentum balance is studied by analyzing the data during a simulated January of the Oregon State University two-level atmospheric general circulation model. Monthly zonal means of the Coriolis torques, the vertical ...

J-W. Kim; W. Grady

1982-05-01T23:59:59.000Z

276

Spatial Predictions of Extreme Wind Speeds over Switzerland Using Generalized Additive Models  

Science Conference Proceedings (OSTI)

The purpose of this work is to present a methodology aimed at predicting extreme wind speeds over Switzerland. Generalized additive models are used to regionalize wind statistics for Swiss weather stations using a number of variables that ...

Christophe Etienne; Anthony Lehmann; Stéphane Goyette; Juan-Ignacio Lopez-Moreno; Martin Beniston

2010-09-01T23:59:59.000Z

277

Climate Simulation for 125 kyr BP with a Coupled Ocean–Atmosphere General Circulation Model  

Science Conference Proceedings (OSTI)

The ECHAM-1 T21/LSG coupled ocean–atmosphere general circulation model (GCM) is used to simulate climatic conditions at the last interglacial maximum (Eemian, 125 kyr BP). The results reflect the expected surface temperature changes (with respect ...

Marisa Montoya; Hans von Storch; Thomas J. Crowley

2000-03-01T23:59:59.000Z

278

The Extratropical 40-Day Oscillation in the UCLA General Circulation Model. Part I: Atmospheric Angular Momentum  

Science Conference Proceedings (OSTI)

Variations in atmospheric angular momentum (AAM) are examined in a three-year simulation of the large-scale atmosphere with perpetual January forcing. The simulation is performed with a version of the UCLA general circulation model that contains ...

S. L. Marcus; M. Ghil; J. O. Dickey

1994-06-01T23:59:59.000Z

279

Interactions between Cloud Microphysics and Cumulus Convection in a General Circulation Model  

Science Conference Proceedings (OSTI)

In the Colorado State University general circulation model, cumulus detrainment of cloud water and cloud ice has been, up to now, the only direct coupling between convective and large-scale condensation processes. This one-way interaction from ...

Laura D. Fowler; David A. Randall

2002-11-01T23:59:59.000Z

280

Surface Energy Fluxes and Coupled Variability in the Tropics of a Coupled General Circulation Model  

Science Conference Proceedings (OSTI)

The effect of wind-evaporative feedbacks upon ENSO, and the coupling of Pacific and Indian Ocean variability, is considered based upon a 110-yr simulation from a coupled ocean and atmosphere general circulation model.

R. L. Miller; X. Jiang

1996-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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

Free and Laterally Nudged Antarctic Climate of an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

Because many of the synoptic cyclones south of the 60°S parallel originate from 60°S and lower latitudes, nudging an atmospheric general circulation model (AGCM) with meteorological analyses at the periphery of the Antarctic region may be ...

Christophe Genthon; Gerhard Krinner; Emmanuel Cosme

2002-06-01T23:59:59.000Z

282

Evaluating Parameterizations in General Circulation Models: Climate Simulation Meets Weather Prediction  

Science Conference Proceedings (OSTI)

To significantly improve the simulation of climate by general circulation models (GCMs), systematic errors in representations of relevant processes must first be identified, and then reduced. This endeavor demands that the GCM parameterizations ...

Thomas J. Phillips; Gerald L. Potter; David L. Williamson; Richard T. Cederwall; James S. Boyle; Michael Fiorino; Justin J. Hnilo; Jerry G. Olson; Shaocheng Xie; J. John Yio

2004-12-01T23:59:59.000Z

283

Global Climate and Ocean Circulation on an Aquaplanet Ocean–Atmosphere General Circulation Model  

Science Conference Proceedings (OSTI)

A low-resolution coupled ocean–atmosphere general circulation model (OAGCM) is used to study the characteristics of the large-scale ocean circulation and its climatic impacts in a series of global coupled aquaplanet experiments. Three ...

Robin S. Smith; Clotilde Dubois; Jochem Marotzke

2006-09-01T23:59:59.000Z

284

A Comparison between General Circulation Model Simulations Using Two Sea Surface Temperature Datasets for January 1979  

Science Conference Proceedings (OSTI)

Simulations with the UCLA atmospheric general circulation model (AGCM) using two different global sea surface temperature (SST) datasets for January 1979 are compared. One of these datasets is based on COADS (SSTs) at locations where there are ...

Tomoaki Ose; Carlos R. Mechoso; David Halpern

1994-04-01T23:59:59.000Z

285

Analysis of Passive Tracer Transport as Modeled by an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

Tracers without feedback on the atmosphere are used to probe tropospheric transport. Such passive tracers are considered for two important anthropogenic sources, Europe and eastern North America. The linearity of passive tracer continuity allows ...

Mark Holzer

1999-06-01T23:59:59.000Z

286

Next Linear Collider Home Page  

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

Welcome to the Next Linear Collider NLC Home Page If you would like to learn about linear colliders in general and about this next-generation linear collider project's mission,...

287

TYPE Ia SUPERNOVAE: CALCULATIONS OF TURBULENT FLAMES USING THE LINEAR EDDY MODEL  

SciTech Connect

The nature of carbon burning flames in Type Ia supernovae is explored as they interact with Kolmogorov turbulence. One-dimensional calculations using the Linear Eddy Model of Kerstein elucidate three regimes of turbulent burning. In the simplest case, large-scale turbulence folds and deforms thin laminar flamelets to produce a flame brush with a total burning rate given approximately by the speed of turbulent fluctuations on the integral scale, U{sub L} , This is the regime where the supernova explosion begins and where most of its pre-detonation burning occurs. As the density declines, turbulence starts to tear the individual flamelets, making broader structures that move faster. For a brief time, these turbulent flamelets are still narrow compared to their spacing and the concept of a flame brush moving with an overall speed of U{sub L} remains valid. However, the typical width of the individual flamelets, which is given by the condition that their turnover time equals their burning time, continues to increase as the density declines. Eventually, mixed regions almost as large as the integral scale itself are transiently formed. At that point, a transition to detonation can occur. The conditions for such a transition are explored numerically and it is estimated that the transition will occur for densities near 1 x 10{sup 7} g cm{sup -3}, provided the turbulent speed on the integral scale exceeds about 20% sonic. An example calculation shows the details of a detonation actually developing.

Woosley, S. E. [Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States); Kerstein, A. R.; Sankaran, V. [Combustion Research Facility, Sandia National Laboratory, Livermore, CA 94551 (United States); Aspden, A. J. [Center for Computational Science and Engineering, Lawrence Berkeley National Laboratory, Berkeley, CA 94720 (United States); Roepke, F. K., E-mail: woosley@ucolick.or, E-mail: arkerst@sandia.go, E-mail: AJAspden@lbl.go, E-mail: fritz@mpa-Garching.mpg.d [Max Planck Institut fuer Astrophysik, Garching (Germany)

2009-10-10T23:59:59.000Z

288

Liquid and Ice Cloud Microphysics in the CSU General Circulation Model. Part III: Sensitivity to Modeling Assumptions  

Science Conference Proceedings (OSTI)

The inclusion of cloud microphysical processes in general circulation models makes it possible to study the multiple interactions among clouds, the hydrological cycle, and radiation. The gaps between the temporal and spatial scales at which such ...

Laura D. Fowler; David A. Randall

1996-03-01T23:59:59.000Z

289

Liquid and Ice Cloud Microphysics in the CSU General Circulation Model. Part 1: Model Description and Simulated Microphysical Processes  

Science Conference Proceedings (OSTI)

Microphysical processes responsible for the formation and dissipation of water and ice clouds have been incorporated into the Colorado State University General Circulation Model in order to 1) yield a more physically based representation of the ...

Laura D. Fowler; David A. Randall; Steven A. Rutledge

1996-03-01T23:59:59.000Z

290

A Generalized Depth-Integrated Model of the Oceanic Mixed Layer  

Science Conference Proceedings (OSTI)

A generalized depth-integrated model of the oceanic mixed layer is developed by considering the heat and energy budgets of the upper ocean. Unlike the Kraus–Turner-type bulk models, the assumptions of an a priori well mixed layer and a positive ...

P. Ravindran; Daniel G. Wright; Trevor Platt; Shubha Sathyendranath

1999-04-01T23:59:59.000Z

291

Atmospheric Vacillations in a General Circulation Model. III: Analysis using Transformed Eulerian-Mean Diagnostics  

Science Conference Proceedings (OSTI)

The vacillatory behavior of the general circulation model described by Hunt (1978a,b) is analyzed using transformed Eulerian-mean diagnostics. This model was shown by Hunt to have large time variations in the troposphere and stratosphere with a ...

David J. Karoly

1982-12-01T23:59:59.000Z

292

Why is the AMOC mono-stable in Coupled General Circulation Models?  

Science Conference Proceedings (OSTI)

This paper is concerned with the question: why do Coupled General Circulation Models (CGCM) seem to be biased towards a mono-stable AMOC? In particular, we investigate whether the mono-stable behavior of the CGCMs is caused by a bias of model ...

Wei Liu; Zhengyu Liu; Esther C. Brady

293

Modeling-Computer Simulations At General Us Region (Goff & Decker, 1983) |  

Open Energy Info (EERE)

Us Region (Goff & Decker, 1983) Us Region (Goff & Decker, 1983) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Modeling-Computer Simulations At General Us Region (Goff & Decker, 1983) Exploration Activity Details Location General Us Region Exploration Technique Modeling-Computer Simulations Activity Date Usefulness useful DOE-funding Unknown Notes Review and identification of 24 potential sites for EGS development across the U.S., as well as modeling of the representative geologic systems in which promising EGS sites occur. References Fraser Goff, Edward R. Decker (1983) Candidate Sites For Future Hot Dry Rock Development In The United States Retrieved from "http://en.openei.org/w/index.php?title=Modeling-Computer_Simulations_At_General_Us_Region_(Goff_%26_Decker,_1983)&oldid=38761

294

Fast structure learning in generalized stochastic processes with latent factors  

Science Conference Proceedings (OSTI)

Understanding and quantifying the impact of unobserved processes is one of the major challenges of analyzing multivariate time series data. In this paper, we analyze a flexible stochastic process model, the generalized linear auto-regressive process ... Keywords: generalized linear models, latent factors, time series analysis

Mohammad Taha Bahadori, Yan Liu, Eric P. Xing

2013-08-01T23:59:59.000Z

295

Linear versus Nonlinear Filtering with Scale-Selective Corrections for Balanced Dynamics in a Simple Atmospheric Model  

Science Conference Proceedings (OSTI)

This paper investigates the role of the linear analysis step of the ensemble Kalman filters (EnKF) in disrupting the balanced dynamics in a simple atmospheric model and compares it to a fully nonlinear particle-based filter (PF). The filters have ...

Aneesh C. Subramanian; Ibrahim Hoteit; Bruce Cornuelle; Arthur J. Miller; Hajoon Song

2012-11-01T23:59:59.000Z

296

IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 19, NO. 4, NOVEMBER 2004 1903 Analysis and Implementation of Model-Based Linear  

E-Print Network (OSTI)

and dynamic symmetrical components in energy processing systems. The procedure is based on the Kalman filter and experimental re- sults on model-based linear estimation of dynamic phasors and dy- namic symmetrical components a Kalman filter is used to detect problems in energy supply to an uninterruptible power supply (UPS

Stankoviæ, Aleksandar

297

Designing a cost-effective CO2 storage infrastructure using a GIS based linear optimization energy model  

Science Conference Proceedings (OSTI)

Large-scale deployment of carbon capture and storage needs a dedicated infrastructure. Planning and designing of this infrastructure require incorporation of both temporal and spatial aspects. In this study, a toolbox has been developed that integrates ... Keywords: CCS, CHP, CO2 capture transport and storage, Energy systems model, Ft, GIS, IGCC, Linear optimization, MARKAL, NGCC, O&M&M, PC

Machteld van den Broek; Evelien Brederode; Andrea Ramírez; Leslie Kramers; Muriel van der Kuip; Ton Wildenborg; Wim Turkenburg; André Faaij

2010-12-01T23:59:59.000Z

298

Surface Wind over Tropical Oceans: Diagnosis of the Momentum Balance, and Modeling the Linear Friction Coefficient  

Science Conference Proceedings (OSTI)

Previous diagnostic studies of surface wind momentum balances over tropical oceans showed that, under a linear friction assumption, the meridional friction coefficient is two to three times larger than the zonal friction coefficient, and that ...

John C. H. Chiang; Stephen E. Zebiak

2000-05-01T23:59:59.000Z

299

Analitic modeling of a solar power plant with parabolic linear collectors.  

E-Print Network (OSTI)

??Foi desenvolvido um modelo analÃtico de um sistema solar tÃrmico de geraÃÃo de eletricidade, com concentradores parabÃlicos de foco linear. O modelo permite simular, realizar… (more)

Milton Matos Rolim

2007-01-01T23:59:59.000Z

300

A Linear Balance Model of Wind-Driven, Midlatitude Ocean Circulation  

Science Conference Proceedings (OSTI)

The Linear Balance Equations (LBE) are intermediate between the more familiar Quasi-geostrophic (QG) and Primitive Equations (PE) in both physical completeness and computational efficiency. We first present a consistent boundary-value problem for ...

James C. Mcwilliams; Nancy J. Norton; Peter R. Gent; Dale B. Haidvogel

1990-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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

Accelerated Iterative Method for Solving Steady Problems of Linearized Atmospheric Models  

Science Conference Proceedings (OSTI)

A new approach, referred to as the accelerated iterative method (AIM), is developed for obtaining steady atmospheric responses with a zonally varying basic state. The linear dynamical operator is divided into two parts, one associated with the ...

Masahiro Watanabe; Fei-fei Jin; Lin Pan

2006-12-01T23:59:59.000Z

302

Support of generalized parton distributions in Bethe-Salpeter models of hadrons  

E-Print Network (OSTI)

The proper support of generalized parton distributions from relativistic constituent quark models with pointlike constituents is studied. The correct support is guaranteed when the vertex function does not depend on the relative minus-momentum. We show that including quark interactions in models with pointlike constituent quarks might lead to a support problem. A computation of the magnitude of the support problem in the Bonn relativistic constituent quark model is presented.

A. Van Dyck; T. Van Cauteren; J. Ryckebusch

2007-10-11T23:59:59.000Z

303

The Relationship between Statistically Linear and Nonlinear Feedbacks and Zonal-Mean Flow Variability in an Idealized Climate Model  

Science Conference Proceedings (OSTI)

Simulations using an idealized, atmospheric general circulation model (GCM) subjected to various thermal forcings are analyzed via a combination of probability density function (PDF) estimation and spectral analysis techniques. Seven different ...

Sergey Kravtsov; John E. Ten Hoeve; Steven B. Feldstein; Sukyoung Lee; Seok-Woo Son

2009-02-01T23:59:59.000Z

304

Fitting Dynamic Models to the Geosat Sea Level Observations in the Tropical Pacific Ocean. Part II: A Linear, Wind-driven Model  

Science Conference Proceedings (OSTI)

The Geosat altimeter sea level observations in the tropical Pacific Ocean are used to evaluate the Performance of a linear wind-driven equatorial wave model. The question posed is the extent to which such a model can describe the observed sea ...

Lee-Lueng Fu; Ichiro Fukumori; Robert N. Miller

1993-10-01T23:59:59.000Z

305

Phenomenology of the minimal $B-L$ Model: the Higgs sector at the Large Hadron Collider and future Linear Colliders  

E-Print Network (OSTI)

This Thesis is devoted to the study of the phenomenology of the Higgs sector of the minimal $B-L$ extension of the Standard Model at present and future colliders. Firstly, the motivations that call for the minimal $B-L$ extension are summarised. In addition, the model is analysed in its salient parts. Moreover, a detailed review of the phenomenological allowed Higgs sector parameter space is given. Finally, a complete survey of the distinctive Higgs boson signatures of the model at both the Large Hadron Collider and the future linear colliders is presented.

Giovanni Marco Pruna

2011-06-23T23:59:59.000Z

306

Estimating forest biomass in the USA using generalized allometric models and MODIS land products  

E-Print Network (OSTI)

Estimating forest biomass in the USA using generalized allometric models and MODIS land products 2006; published 11 May 2006. [1] Spatially-distributed forest biomass components are essential to understand carbon cycle and the impact of biomass burning emissions on air quality. We estimated the density

Kuligowski, Bob

307

Computable General Equilibrium Models for the Analysis of Energy and Climate Policies  

E-Print Network (OSTI)

Computable General Equilibrium Models for the Analysis of Energy and Climate Policies Ian Sue Wing of the economy-wide impacts of energy and climate policies. JEL Classification: C68, D58, H22, Q43 Keywords of energy and environmental policies. Perhaps the most important of these applications is the analysis

Wing, Ian Sue

308

The Parameterization Of the Planetary Boundary Layer in the UCLA General Circulation Model: Formulation and Results  

Science Conference Proceedings (OSTI)

A planetary boundary layer (PBL) parameterization for general circulation models (GCMs) is presented. It uses a mixed-layer approach in which the PBL is assumed to be capped by discontinuities in the mean profiles. Both clear and cloud-topped ...

Max J. Suarez; Akio Arakawa; David A. Randall

1983-11-01T23:59:59.000Z

309

Graph-based distributed cooperative navigation for a general multi-robot measurement model  

Science Conference Proceedings (OSTI)

Cooperative navigation (CN) enables a group of cooperative robots to reduce their individual navigation errors. For a general multi-robot (MR) measurement model that involves both inertial navigation data and other onboard sensor readings, taken at different ... Keywords: Filtering, information fusion, localization, multi-agent systems, navigation

Vadim Indelman; Pini Gurfil; Ehud Rivlin; Hector Rotstein

2012-08-01T23:59:59.000Z

310

Data Constraints Applied to Models of the Ocean General Circulation. Part I: The Steady Case  

Science Conference Proceedings (OSTI)

In this work we take a first step in the process of assimilating data into models of the ocean general circulation. The goals is not prediction but rather understanding how the data insertion process affects, and is affected by, the dynamics ...

Paola Malanotte-Rizzoli; William R. Holland

1986-10-01T23:59:59.000Z

311

A general model for massgrowthdensity relations across tree-dominated communities  

E-Print Network (OSTI)

ABSTRACT A general allometric scaling model predicts that plant body mass MT will scale as the -4/3 power for understanding and predicting the effects of crowding on plant size, growth and biomass partitioning across to plant mass­growth­density relation- ships. It rests on only two fundamental scaling relationships

Enquist, Brian Joseph

312

Multiple sea-ice states and abrupt MOC transitions in a general circulation ocean model  

E-Print Network (OSTI)

Multiple sea-ice states and abrupt MOC transitions in a general circulation ocean model Yosef: 25 September 2012 Ã? Springer-Verlag Berlin Heidelberg 2012 Abstract Sea ice has been suggested, based-called ``sea-ice switch'' mech- anism. An important requirement for this mechanism is that multiple sea-ice

Ashkenazy, Yossi "Yosef"

313

Selected translated abstracts of Russian-language climate-change publications. 4: General circulation models  

SciTech Connect

This report presents English-translated abstracts of important Russian-language literature concerning general circulation models as they relate to climate change. Into addition to the bibliographic citations and abstracts translated into English, this report presents the original citations and abstracts in Russian. Author and title indexes are included to assist the reader in locating abstracts of particular interest.

Burtis, M.D. [comp.] [Oak Ridge National Lab., TN (United States). Carbon Dioxide Information Analysis Center; Razuvaev, V.N.; Sivachok, S.G. [All-Russian Research Inst. of Hydrometeorological Information--World Data Center, Obninsk (Russian Federation)

1996-10-01T23:59:59.000Z

314

Interannual Tropical Rainfall Variability in General Circulation Model Simulations Associated with the Atmospheric Model Intercomparison Project  

Science Conference Proceedings (OSTI)

The interannual variability of rainfall over the Indian subcontinent, the African Sahel, and the Nordeste region of Brazil have been evaluated in 32 models for the period 1979–88 as part of the Atmospheric Model Intercomparison Project (AMIP). ...

K. R. Sperber; T. N. Palmer

1996-11-01T23:59:59.000Z

315

Development of a General Ecosystem Model for a Range of Scales and Ecosystems  

E-Print Network (OSTI)

We have developed a General Ecosystem Model (GEM) that is designed to simulate a variety of ecosystem types using a fixed model structure. Driven largely by hydrologic algorithms for upland, wetland and shallow-water habitats, the model captures the response of macrophyte and algal communities to simulated levels of nutrients, water, and environmental inputs. It explicitly incorporates ecological processes that determine water levels, plant production, nutrient cycling associated with organic matter decomposition, consumer dynamics, and fire. While the model may be used to simulate ecosystem dynamics for a single homogenous habitat, our primary objective is to replicate it as a "unit" model in heterogeneous, grid-based dynamic spatial models using different parameter sets for each habitat. Thus, we constrained the process (i.e., computational) complexity, yet targeted a level of disaggregation that would effectively capture the feedbacks among important ecosystem processes. A basic ver...

H. C. Fitz; E. B. DeBellevue; R. Costanza; R. Boumans; T. Maxwell; L. Wainger; F.H. Sklar

1994-01-01T23:59:59.000Z

316

A GENERALIZED MODEL OF NONLINEAR DIFFUSIVE SHOCK ACCELERATION COUPLED TO AN EVOLVING SUPERNOVA REMNANT  

Science Conference Proceedings (OSTI)

To better model the efficient production of cosmic rays (CRs) in supernova remnants (SNRs) with the associated coupling between CR production and SNR dynamics, we have generalized an existing cr-hydro-NEI code to include the following processes: (1) an explicit calculation of the upstream precursor structure including the position-dependent flow speed, density, temperature, and magnetic field strength; (2) a momentum- and space-dependent CR diffusion coefficient; (3) an explicit calculation of magnetic field amplification; (4) calculation of the maximum CR momentum using the amplified magnetic field; (5) a finite Alfven speed for the particle scattering centers; and (6) the ability to accelerate a superthermal seed population of CRs, as well as the ambient thermal plasma. While a great deal of work has been done modeling SNRs, most work has concentrated on either the continuum emission from relativistic electrons or ions or the thermal emission from the shock heated plasma. Our generalized code combines these elements and describes the interplay between CR production and SNR evolution, including the nonlinear coupling of efficient diffusive shock acceleration, based mainly on the work of P. Blasi and coworkers, and a non-equilibrium ionization (NEI) calculation of thermal X-ray line emission. We believe that our generalized model will provide a consistent modeling platform for SNRs, including those interacting with molecular clouds, and improve the interpretation of current and future observations, including the high-quality spectra expected from Astro-H. SNR RX J1713.7-3946 is modeled as an example.

Lee, Shiu-Hang; Nagataki, Shigehiro [Yukawa Institute for Theoretical Physics, Kyoto University, Oiwake-cho Kitashirakawa, Sakyo-ku, Kyoto 606-8502 (Japan); Ellison, Donald C., E-mail: lee@yukawa.kyoto-u.ac.jp, E-mail: nagataki@yukawa.kyoto-u.ac.jp, E-mail: don_ellison@ncsu.edu [Physics Department, North Carolina State University, Box 8202, Raleigh, NC 27695 (United States)

2012-05-10T23:59:59.000Z

317

Examination of Numerical Results from Tangent Linear and Adjoint of Discontinuous Nonlinear Models  

Science Conference Proceedings (OSTI)

The forward model solution and its functional (e.g., the cost function in 4DVAR) are discontinuous with respect to the model's control variables if the model contains discontinuous physical processes that occur during the assimilation window. In ...

S. Zhang; X. Zou; Jon E. Ahlquist

2001-11-01T23:59:59.000Z

318

Predictors of Tropical Cyclone Numbers and Extreme Hurricane Intensities over the North Atlantic Using Generalized Additive and Linear Models  

Science Conference Proceedings (OSTI)

Fluctuations of the annual number of tropical cyclones over the North Atlantic and of the energy dissipated by the most intense hurricane of a season are related to a variety of predictors [global temperature, SST and detrended SST, North ...

Olivier Mestre; Stéphane Hallegatte

2009-02-01T23:59:59.000Z

319

General quantum modeling of combining concepts: A quantum field model in Fock space  

E-Print Network (OSTI)

We extend a quantum model in Hilbert space developed in Aerts (2007a) into a quantum field theoric model in Fock space for the modeling of the combination of concepts. Items and concepts are represented by vectors in Fock space and membership weights of items are modeled by quantum probabilities. We apply this theory to model the disjunction of concepts and show that the predictions of our theory for the membership weights of items regarding the disjunction of concepts match with great accuracy the complete set of results of an experiment conducted by Hampton (1988b). It are the quantum effects of interference and superposition of that are at the origin of the effects of overextension and underextension observed by Hampton as deviations from a classical use of the disjunction. It is essential for the perfect matches we obtain between the predictions of the quantum field model and Hampton’s experimental data that items can be in superpositions of ‘different numbers states ’ which proves that the genuine structure of quantum field theory is needed to match predictions with experimental data.

Diederik Aerts

2007-01-01T23:59:59.000Z

320

Theoretical and practical aspects of linear and nonlinear model order reduction techniques  

E-Print Network (OSTI)

Model order reduction methods have proved to be an important technique for accelerating time-domain simulation in a variety of computer-aided design tools. In this study we present several new techniques for model reduction ...

Vasilyev, Dmitry Missiuro

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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.


321

The Role of Wave Breaking, Linear Instability, and PV Transports in Model Block Onset  

Science Conference Proceedings (OSTI)

To understand mechanisms responsible for the onset of atmospheric blocks, the authors study model blocks that form in a two-layer isentropic primitive equation model. The latter includes diabatic heating, parameterized as a Newtonian relaxation ...

Manuel S. F. V. de Pondeca; Albert Barcilon; Xiaolei Zou

1998-09-01T23:59:59.000Z

322

In-situ prediction on sensor networks using distributed multiple linear regression models  

E-Print Network (OSTI)

Within sensor networks for environmental monitoring, a class of problems exists that requires in-situ control and modeling. In this thesis, we provide a solution to these problems, enabling model-driven computation where ...

Basha, Elizabeth (Elizabeth Ann)

2010-01-01T23:59:59.000Z

323

Guideline for the Procurement of General Electric MS 9001 Models B/E Gas Turbine Parts  

Science Conference Proceedings (OSTI)

In recent years, a number of aftermarket component suppliers have begun offering replacement first, second, and third stage buckets and nozzles for the General Electric (GE) MS 9001B and its related newer version MS 9001E gas turbine, more commonly referred to as the 9B and 9E models. Several different designs, materials, and casting processes have been offered for these components for operation at different full-load firing temperatures. This procurement guideline is intended for use by power producers ...

2008-03-03T23:59:59.000Z

324

Guideline for the Procurement of General Electric MS6001 Model B Gas Turbine Parts  

Science Conference Proceedings (OSTI)

In recent years, a number of aftermarket component suppliers have begun offering replacement 1st, 2nd, and 3rd stage buckets and nozzles for the General Electric (GE) MS6001 Model B gas turbine. Several different designs, materials, and casting processes have been offered for these components for operation over at different peak firing temperatures. This procurement guideline is intended to provide owners with the requirements necessary to procure all three stages of buckets and nozzles for a GE MS6001 M...

2007-03-22T23:59:59.000Z

325

Conditional AIC Under General and Generalized Linear Mixed Models and Smoothing in the Presence of Random Effects with Application to fMRI Data Analysis  

E-Print Network (OSTI)

consider the use of the B-spline basis here; these are oftenMarx. Flexible smoothing with B-splines and penalties. Sta-difference penalties and the B-spline ba- sis are introduced

Overholser, Rosanna H.

326

A generalized theory for non-classical transport with angular-dependent path-length distributions 2: Anisotropic diffusion in model pebble bed reactor cores  

E-Print Network (OSTI)

We describe an analysis of neutron transport in the interior of model pebble bed reactor (PBR) cores, considering both crystal and random pebble arrangements. Monte Carlo codes were developed for (i) generating random realizations of the model PBR core, and (ii) performing neutron transport inside the crystal and random heterogeneous cores; numerical results are presented for two different choices of material parameters. These numerical results are used to investigate the anisotropic behavior of neutrons in each case and to assess the accuracy of estimates for the diffusion coefficients obtained with the diffusion approximations of different models: the atomic mix model, the Behrens correction, the Lieberoth correction, the generalized linear Boltzmann equation (GLBE), and the new GLBE with angular-dependent path-length distributions. This new theory utilizes a non-classical form of the Boltzmann equation in which the locations of the scattering centers in the system are correlated and the distance-to-collisi...

Vasques, Richard

2013-01-01T23:59:59.000Z

327

AA Fest. General Circulation Model Development: Past, Present and Future. A Symposium in Honor of Professor Akio Arakawa  

SciTech Connect

OAK-B135 AA Fest. General Circulation Model Development: Past, Present and Future. A Symposium in Honor of Professor Akio Arakawa

Ide, K.; Wakimoto, R.M.

1998-01-20T23:59:59.000Z

328

Reduced Effective Model for Condensation in Slender Tubes with Rotational Symmetry, Obtained by Generalized Dimensional Analysis  

E-Print Network (OSTI)

Experimental results for condensation in compact heat exchangers show that the heat transfer due to condensation is significantly better compared to classical heat exchangers, especially when using R134a instead of water as the refrigerant. This suggests that surface tension plays a role. Using generalized dimensional analysis we derive reduced model equations and jump conditions for condensation in a vertical tube with cylindrical cross section. Based on this model we derive a single ordinary differential equation for the thickness of the condensate film as function of the tube axis. Our model agrees well with commonly used models from existing literature. It is based on the physical dimensions of the problem and has greater geometrical flexibility.

Dziubek, Andrea

2011-01-01T23:59:59.000Z

329

First–Order Representations of Discrete Linear MultidimensionalSystems  

Science Conference Proceedings (OSTI)

The classical local state–space models for discrete multidimensional linear systems, as proposed by Roesser or Fornasini and Marchesini, require causality of the resulting transfer matrices. We consider a generalization comprising non-causal ... Keywords: (Laurent) polynomial matrices, behavior, first–, input–, kernel and image representation, linear fractional transformation, minimality, order representation, output structure, properness

Eva Zerz

2000-10-01T23:59:59.000Z

330

PHYSICAL REVIE%' B VOLUME 33, NUMBER 4 15 FEBRUARY 1986 Application of a general self-consistency scheme in the linear combination of atomic orbitals  

E-Print Network (OSTI)

-Knapp 1980 2 2w Z . xRT V qVcby cy1 b Z .a T V Z .Kubic 1982 2 Z .RT Vqc Z .a T V Z . Z .Patel-Teja PT 1982 w-Robinson 1976 and Kubic 1982 equations of state and concluded that it was more accurate than either the Peng-Robinson or the Kubic equation of state. Z .Lin et al. 1996 extended the generalized quartic equation Z .of state Eq. 23

Vanderbilt, David

331

Development of linear capacitance-resistance models for characterizing waterflooded reservoirs.  

E-Print Network (OSTI)

??The capacitance-resistance model (CRM) has been continuously improved and tested on both synthetic and real fields. For a large waterflood, with hundreds of injectors and… (more)

Kim, Jong Suk

2012-01-01T23:59:59.000Z

332

Linear Solar Models: a simple tool to investigate the properties of solar interior  

E-Print Network (OSTI)

We describe a simple method to study the dependence of the solar properties on a generic (small) modification the physical inputs adopted in standard solar models calculations.

Villante, F L

2010-01-01T23:59:59.000Z

333

A Simplified Quasi-Linear Model for Wave Generation and Air–Sea Momentum Flux  

Science Conference Proceedings (OSTI)

A simplified model is described for wave generation and air–sea momentum flux. The model is based upon the quasilinear theory employed by Fabrikant and Janssen, in which the mean flow is approximated to second order in the wave amplitude and ...

Alastair D. Jenkins

1993-09-01T23:59:59.000Z

334

Normal Mode Initialization for a Multilevel Grid-Point Model. Part I: Linear Aspects  

Science Conference Proceedings (OSTI)

In Part I of this paper we review initialization methods for numerical weather prediction models, leading up to the development of schemes based on the normal modes of the forecast model. We present the derivation of the normal modes of ECMWF's ...

Clive Temperton; David L. Williamson

1981-04-01T23:59:59.000Z

335

Approximate forward-backward algorithm for a switching linear Gaussian model  

Science Conference Proceedings (OSTI)

A hidden Markov model with two hidden layers is considered. The bottom layer is a Markov chain and given this the variables in the second hidden layer are assumed conditionally independent and Gaussian distributed. The observation process is Gaussian ... Keywords: Approximation, Forward-backward algorithm, Hidden Markov model, Metropolis-Hastings algorithm, Seismic inversion

Hugo Hammer; Håkon Tjelmeland

2011-01-01T23:59:59.000Z

336

Stochastic Control of Linear and Nonlinear Econometric Models: Some Computational Aspects  

Science Conference Proceedings (OSTI)

This paper considers the optimal control of small econometric models applying the OPTCON algorithm. OPTCON determines approximate numerical solutions to optimum control problems for nonlinear stochastic systems. These optimum control problems consist ... Keywords: Algorithms, Nonlinear models, Optimal control, Outliers, Policy applications, Stochastic control

D. Blueschke; V. Blueschke-Nikolaeva; R. Neck

2013-06-01T23:59:59.000Z

337

A Joint-Diffused Inpainting Model for Underexposure Image Preserving the Linear Geometric Structure  

Science Conference Proceedings (OSTI)

To restore the underexposure image, an illumination compensation inpainting model which employs the joint-diffused partial differential equations (PDEs) is proposed. Firstly, the novel model compensates the illumination effect in multi-scaled underexposure ... Keywords: illumination compensation, image inpainting, partial differential equation (PDE), quotient image (QI)

Jiying Wu; Qiuqi Ruan; Gaoyun An

2009-01-01T23:59:59.000Z

338

A parameter estimation approach for non-linear systems biology models using spline approximation  

Science Conference Proceedings (OSTI)

Mathematical models for revealing the dynamics and interactions properties of biological systems play an important role in computational systems biology. The inference of model parameter values from time-course data can be considered as a "reverse engineering" ... Keywords: nonlinear programming, parameter estimation, spline

Choujun Zhan; Lam Fat Yeung

2010-08-01T23:59:59.000Z

339

A "Nearly Ideal" Solution to Linear Time-Varying Rational Expectations Models  

Science Conference Proceedings (OSTI)

For a well-identified class of forward-looking models under rational expectations and time-varying parameters, it is shown that there exists always a solution having the property of being the closest, in mean square, to the state motion of the autoregressive ... Keywords: C5, C6, Kalman Filtering, Rational expectations models, Time-varying parameters

Francesco Carravetta; Marco M. Sorge

2010-04-01T23:59:59.000Z

340

The Simulation of Stationary and Transient Geopotential-Height Eddies in January and July with a Spectral General Circulation Model  

Science Conference Proceedings (OSTI)

We examine the characteristics of stationary and transient eddies in the geopotential-height field as simulated by a spectral general circulation model. The model possesses a realistic distribution of continents and oceans and realistic, but ...

Robert C. Malone; Eric J. Pitcher; Maurice L. Blackmon; Kamal Puri; William Bourke

1984-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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

Simulation of the Tropical Pacific Climate with a Coupled Ocean-Atmosphere General Circulation Model. Part II: Interannual Variability  

Science Conference Proceedings (OSTI)

Two multiyear simulations with a coupled ocean-atmosphere general circulation model (GCM)-totaling 45 years-are used to investigate interannual variability at the equator. The model consists of the UCLA global atmospheric GCM coupled to the GFDL ...

A. W. Robertson; C-C. Ma; M. Ghil; C. R. Mechoso

1995-05-01T23:59:59.000Z

342

Relationships between Net Radiation at the Surface and the Top of the Atmosphere Derived from a General Circulation Model  

Science Conference Proceedings (OSTI)

The relationships between the net radiation at the surface and the top of the atmosphere in the UCLA general circulation model are investigated. These suggest that it may be possible to formulate statistical models from limited observations ...

Bryan C. Weare

1989-02-01T23:59:59.000Z

343

Impact of Climate Drift on Twenty-First-Century Projection in a Coupled Atmospheric–Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

Reducing climate drift in coupled atmosphere–ocean general circulation models (AOGCMs) usually requires 1000–2000 years of spinup, which has not been practical for every modeling group to do. For the purpose of evaluating the impact of climate ...

Mao-Chang Liang; Li-Ching Lin; Ka-Kit Tung; Yuk L. Yung; Shan Sun

2013-10-01T23:59:59.000Z

344

Variability of the Tropical Atlantic Ocean Simulated by a General Circulation Model with Two Different Mixed-Layer Physics  

Science Conference Proceedings (OSTI)

The embedment of a 1.5 turbulence closure model in an ocean general circulation model of the equatorial Atlantic is presented. The eddy viscosity and diffusivity involved in the vertical mixing are defined as the product of a characteristic ...

Bruno Blanke; Pascale Delecluse

1993-07-01T23:59:59.000Z

345

A mixed-integer linear optimization model for local energy system planning based on simplex and branch-and-bound algorithms  

Science Conference Proceedings (OSTI)

A Mixed-integer linear optimization model is developed to support the decision making for the sustainable use of energy in the local area. It details exploitation of primary energy sources, electrical and thermal generation, enduse sectors and emissions. ... Keywords: branch-and-bound algorithm, local energy system, low-carbon society, mixed-integer linear optimization, simplex algorithm

Hongbo Ren; Weisheng Zhou; Weijun Gao; Qiong Wu

2010-09-01T23:59:59.000Z

346

Reduced-order, trajectory piecewise-linear models for nonlinear computational fluid dynamics  

E-Print Network (OSTI)

Computational fluid dynamics (CFD) is now widely used throughout the fluid dynamics community and yields accurate models for problems of interest. However, due to its high computational cost, CFD is limited for some ...

Gratton, David, 1979-

2004-01-01T23:59:59.000Z

347

TEA - a linear frequency domain finite element model for tidal embayment analysis  

E-Print Network (OSTI)

A frequency domain (harmonic) finite element model is developed for the numerical prediction of depth average circulation within small embayments. Such embayments are often characterized by irregular boundaries and bottom ...

Westerink, Joannes J.

1984-01-01T23:59:59.000Z

348

Universal squash model for optical communications using linear optics and threshold detectors  

SciTech Connect

Transmission of photons through open-air or optical fibers is an important primitive in quantum-information processing. Theoretical descriptions of this process often consider single photons as information carriers and thus fail to accurately describe experimental implementations where any number of photons may enter a detector. It has been a great challenge to bridge this big gap between theory and experiments. One powerful method for achieving this goal is by conceptually squashing the received multiphoton states to single-photon states. However, until now, only a few protocols admit a squash model; furthermore, a recently proven no-go theorem appears to rule out the existence of a universal squash model. Here we show that a necessary condition presumed by all existing squash models is in fact too stringent. By relaxing this condition, we find that, rather surprisingly, a universal squash model actually exists for many protocols, including quantum key distribution, quantum state tomography, Bell's inequality testing, and entanglement verification.

Fung, Chi-Hang Fred; Chau, H. F. [Department of Physics and Center of Computational and Theoretical Physics, University of Hong Kong, Pokfulam Road (Hong Kong); Lo, Hoi-Kwong [Center for Quantum Information and Quantum Control, Department of Physics and Department of Electrical and Computer Engineering, University of Toronto, Toronto, Ontario, M5S 3G4 (Canada)

2011-08-15T23:59:59.000Z

349

Unsteady, Turbulent Convection into a Rotating, Linearly Stratified Fluid: Modeling Deep Ocean Convection  

Science Conference Proceedings (OSTI)

A laboratory experiment has been constructed to Model the deep convective processes in a stratified ocean driven by the energetic cooling at the ocean surface. For convenience in the laboratory the authors have examined the analogous but inverted ...

M. J. Coates; G. N. Ivey; J. R. Taylor

1995-12-01T23:59:59.000Z

350

A Linear Discrete Dynamic System Model for Temporal Gene Interaction and Regulatory  

E-Print Network (OSTI)

Influence in Response to Bioethanol Conversion Inhibitor HMF for Ethanologenic Yeast Mingzhou (Joe) Song1 significantly expressed genes in response to bioethanol conversion inhibitor 5-hydroxymethylfurfural in detoxification for bioethanol conversion by yeast. 1 Introduction Computational modeling of gene regulatory

Song, Joe

351

The SGB/NP Hydration Free Energy Model Based on the Surface Generalized Born Solvent Reaction Field and  

E-Print Network (OSTI)

The SGB/NP Hydration Free Energy Model Based on the Surface Generalized Born Solvent Reaction Field and Novel Nonpolar Hydration Free Energy Estimators EMILIO GALLICCHIO, LINDA YU ZHANG, RONALD M. LEVY Generalized Born continuum dielectric electrostatic model using explicit solvent free energy perturbation

352

Universal Squash Model For Optical Communications Using Linear Optics And Threshold Detectors  

E-Print Network (OSTI)

The transmission of photons through open-air or an optical fiber is an important primitive in quantum information processing. Theoretical description of such a transmission process often considers only a single photon as the information carrier and thus fails to accurately describe experimental optical implementations where any number of photons may enter a detector. It is important to bridge this big gap between experimental implementations and the theoretical description. One powerful method that emerges from recent efforts to achieve this goal is to consider a squash model that conceptually converts multi-photon states to single-photon states, thereby justifying the equivalence between theory and experiments. However, up to now, only a limited number of protocols admit a squash model; furthermore, a no-go theorem has been proven which appears to rule out the existence of a universal squash model. Here, we observe that an apparently necessary condition demanded by all existing squash models to preserve measurement statistics is too stringent a requirement for many protocols. By chopping this requirement, we show that rather surprisingly, a universal squash model actually exists for a wide range of protocols including quantum key distribution protocols, quantum state tomography, the testing of Bell's inequalities, and entanglement verification, despite the standard no-go theorem.

Chi-Hang Fred Fung; H. F. Chau; Hoi-Kwong Lo

2010-11-12T23:59:59.000Z

353

Final Technical Report: "Representing Endogenous Technological Change in Climate Policy Models: General Equilibrium Approaches"  

SciTech Connect

The research supported by this award pursued three lines of inquiry: (1) The construction of dynamic general equilibrium models to simulate the accumulation and substitution of knowledge, which has resulted in the preparation and submission of several papers: (a) A submitted pedagogic paper which clarifies the structure and operation of computable general equilibrium (CGE) models (C.2), and a review article in press which develops a taxonomy for understanding the representation of technical change in economic and engineering models for climate policy analysis (B.3). (b) A paper which models knowledge directly as a homogeneous factor, and demonstrates that inter-sectoral reallocation of knowledge is the key margin of adjustment which enables induced technical change to lower the costs of climate policy (C.1). (c) An empirical paper which estimates the contribution of embodied knowledge to aggregate energy intensity in the U.S. (C.3), followed by a companion article which embeds these results within a CGE model to understand the degree to which autonomous energy efficiency improvement (AEEI) is attributable to technical change as opposed to sub-sectoral shifts in industrial composition (C.4) (d) Finally, ongoing theoretical work to characterize the precursors and implications of the response of innovation to emission limits (E.2). (2) Data development and simulation modeling to understand how the characteristics of discrete energy supply technologies determine their succession in response to emission limits when they are embedded within a general equilibrium framework. This work has produced two peer-reviewed articles which are currently in press (B.1 and B.2). (3) Empirical investigation of trade as an avenue for the transmission of technological change to developing countries, and its implications for leakage, which has resulted in an econometric study which is being revised for submission to a journal (E.1). As work commenced on this topic, the U.S. withdrawal from Kyoto and the administration's announcement of a voluntary target based on emission intensity made it apparent that the degree of emission leakage to developing countries would depend on (i) the form of the emission limit set by developed countries and (ii) the incentives faced by developing nations to accede to an international climate regime. This realization led to synergistic research on the properties of intensity targets under uncertainty, which resulted in two theoretical studies, one which has been published (A.1) and the other which is currently in review (C.5).

Ian Sue Wing

2006-04-18T23:59:59.000Z

354

Spontaneous fission half-lives of heavy and superheavy nuclei within a generalized liquid drop model  

E-Print Network (OSTI)

We systematically calculate the spontaneous fission half-lives for heavy and superheavy nuclei between U and Fl isotopes. The spontaneous fission process is studied within the semi-empirical WKB approximation. The potential barrier is obtained using a generalized liquid drop model, taking into account the nuclear proximity, the mass asymmetry, the phenomenological pairing correction, and the microscopic shell correction. Macroscopic inertial-mass function has been employed for the calculation of the fission half-life. The results reproduce rather well the experimental data. Relatively long half-lives are predicted for many unknown nuclei, sufficient to detect them if synthesized in a laboratory.

Xiaojun Bao; Hongfei Zhang; G. Royer; Junqing Li

2013-02-28T23:59:59.000Z

355

Cloud-radiative effects on implied oceanic energy transports as simulated by atmospheric general circulation models  

DOE Green Energy (OSTI)

This paper reports on energy fluxes across the surface of the ocean as simulated by fifteen atmospheric general circulation models in which ocean surface temperatures and sea-ice boundaries are prescribed. The oceanic meridional energy transport that would be required to balance these surface fluxes is computed, and is shown to be critically sensitive to the radiative effects of clouds, to the extent that even the sign of the Southern Hemisphere ocean energy transport can be affected by the errors in simulated cloud-radiation interactions.

Gleckler, P.J. [Lawrence Livermore National Lab., CA (United States); Randall, D.A. [Colorado State Univ., Fort Collins, CO (United States); Boer, G. [Canadian Climate Centre, Victoria (Canada)

1994-03-01T23:59:59.000Z

356

Dynamic Characteristics of Regional Flows around the Pyrénées in View of the PYREX Experiment. Part II: Solution of a Linear Model Compared to Field Measurements  

Science Conference Proceedings (OSTI)

This paper considers a linear hydrostatic model of a stable, uniform, constant rotational airflow over three- dimensional, elliptic, cross-sectional families of mountains in a z system. The surface pressure and the winds that are induced around ...

E. Koffi; B. Bénech; J. Stein; B. Terliuc

1998-01-01T23:59:59.000Z

357

A linear discrete dynamic system model for temporal gene interaction and regulatory network influence in response to bioethanol conversion inhibitor HMF for ethanologenic yeast  

Science Conference Proceedings (OSTI)

A linear discrete dynamic system model is constructed to represent the temporal interactions among significantly expressed genes in response to bioethanol conversion inhibitor 5-hydroxymethylfurfural for ethanologenic yeast Saccharomyces cerevisiae. ...

Mingzhou Joe Song; Z. Lewis Liu

2006-12-01T23:59:59.000Z

358

Development of a linear predictive model for carbon dioxide sequestration in deep saline carbonate aquifers  

Science Conference Proceedings (OSTI)

CO"2 injection into deep saline aquifers is a preferred method for mitigating CO"2 emission. Although deep saline aquifers are found in many sedimentary basins and provide very large storage capacities, several numerical simulations are needed before ... Keywords: CO2 sequestration, Deep saline carbonate aquifer, Latin hypercube space filling design, Predictive model

Sultan Anbar; Serhat Akin

2011-11-01T23:59:59.000Z

359

Augmented l1 and Nuclear-Norm Models with a Globally Linearly ...  

E-Print Network (OSTI)

and X? and XF are the nuclear and Frobenius norms of X, respectively. We show that they let .... the total energy x0. 2 is roughly ..... Some expert readers may know that in theory, given matrix A, whether or not model (1) can exactly recover x0 ...

360

On enhanced non-linear free surface flow simulations with a hybrid LBM-VOF model  

Science Conference Proceedings (OSTI)

In this paper, we present extensions, extensive validations and applications of our previously published hybrid volume-of-fluid-based (VOF) model for the simulation of free-surface flow problems. For the solution of the flow field, the lattice Boltzmann ... Keywords: Free surface, Lattice Boltzmann method, PLIC, Plunging breaker, Potential flow, Volume of fluid

Christian F. JaníEn; Stephan T. Grilli; Manfred Krafczyk

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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

Regional residual plots for assessing the fit of linear regression models  

Science Conference Proceedings (OSTI)

An intuitively appealing lack-of-fit test to assess the adequacy of a regression model is introduced together with a graphical diagnostic tool. The graphical method itself includes a formal testing procedure, and, it is particularly useful to detect ... Keywords: Diagnostic tool, Graphical method, Lack-of-fit, Multiple regression

E. Deschepper; O. Thas; J. P. Ottoy

2006-04-01T23:59:59.000Z

362

A hierarchical framework for coupling surface fluxes to atompsheric general circulation models: The homogeneity test  

SciTech Connect

The atmosphere and the biosphere are inherently coupled to one another. Atmospheric surface state variables such as temperature, winds, water vapor, precipitation, and radiation control biophysical, biogeochemical, and ecological processes at the surface and subsurface. At the same time, surface fluxes of momentum, moisture, heat, and trace gases act as time-dependent boundary conditions providing feedback on atmospheric processes. To understand such phenomena, a coupled set of interactive models is required. Costs are still prohibitive for computing surface/subsurface fluxes directly for medium-resolution atmospheric general circulation models (AGCMs), but a technique has been developed for testing large-scale homogeneity and accessing surface parameterizations and models to reduce this computational cost and maintain accuracy. This modeling system potentially bridges the observed spatial and temporal ranges yet allows the incorporation of necessary details about individual ecological community types or biomes and simulates the net momentum, heat, moisture, and trace gas fluxes. This suite of coupled models is defined here as the hierarchical systems flux scheme (HSFS).

Miller, N.L.

1993-01-01T23:59:59.000Z

363

Volcanic forcing improves Atmosphere-Ocean Coupled General Circulation Model scaling performance  

E-Print Network (OSTI)

Recent Atmosphere-Ocean Coupled General Circulation Model (AOGCM) simulations of the twentieth century climate, which account for anthropogenic and natural forcings, make it possible to study the origin of long-term temperature correlations found in the observed records. We study ensemble experiments performed with the NCAR PCM for 10 different historical scenarios, including no forcings, greenhouse gas, sulfate aerosol, ozone, solar, volcanic forcing and various combinations, such as it natural, anthropogenic and all forcings. We compare the scaling exponents characterizing the long-term correlations of the observed and simulated model data for 16 representative land stations and 16 sites in the Atlantic Ocean for these scenarios. We find that inclusion of volcanic forcing in the AOGCM considerably improves the PCM scaling behavior. The scenarios containing volcanic forcing are able to reproduce quite well the observed scaling exponents for the land with exponents around 0.65 independent of the station dista...

Vyushin, D; Havlin, S; Bunde, A; Brenner, S; Vyushin, Dmitry; Zhidkov, Igor; Havlin, Shlomo; Bunde, Armin; Brenner, Stephen

2004-01-01T23:59:59.000Z

364

On confinement interactions in nonlinear generalizations of the Wick-Cutkosky model  

E-Print Network (OSTI)

We consider nonlinear-mediating-field generalizations of the Wick-Cutkosky model. Using an expansion in the nonlinearity parameter and eliminating the mediating field by means of the covariant Green function we arrive at a Lagrangian density containing many-point time-nonlocal interaction terms. In low-order approximations of $\\phi^3$ theory we obtain the usual two-current interaction as well as a three-current interaction of a confining type. The same result is obtained without approximation for a version of the dipole model. The transition to the Hamiltonian formalism and subsequent canonical quantization is performed with time non-locality taken into account approximately. Relativistic two- and three-particle wave equations are derived variationally by using trial states containing many-particle Fock space components. The non-relativistic limits of these equations are obtained and their properties are analyzed and discussed briefly.

Darewych, Jurij W

2009-01-01T23:59:59.000Z

365

A General Simulation Framework for Supply Chain Modeling: State of the Art and Case Study  

E-Print Network (OSTI)

Nowadays there is a large availability of discrete event simulation software that can be easily used in different domains: from industry to supply chain, from healthcare to business management, from training to complex systems design. Simulation engines of commercial discrete event simulation software use specific rules and logics for simulation time and events management. Difficulties and limitations come up when commercial discrete event simulation software are used for modeling complex real world-systems (i.e. supply chains, industrial plants). The objective of this paper is twofold: first a state of the art on commercial discrete event simulation software and an overview on discrete event simulation models development by using general purpose programming languages are presented; then a Supply Chain Order Performance Simulator (SCOPS, developed in C++) for investigating the inventory management problem along the supply chain under different supply chain scenarios is proposed to readers.

Cimino, Antonio; Mirabelli, Giovanni

2010-01-01T23:59:59.000Z

366

A GENERAL RELATIVISTIC EXTERNAL COMPTON-SCATTERING MODEL FOR TeV EMISSION FROM M87  

SciTech Connect

M87 is the first detected non-blazar extragalactic tera-electron-volt (TeV) source with rapid variation and a very flat spectrum in the TeV band. To explain the two peaks in the spectral energy distribution of the nucleus of M87, which is similar to that of blazars, the most commonly adopted models are the synchrotron self-Compton-scattering models and the external inverse Compton (EIC) scattering models. Considering that there is no correlated variation in the soft band (from radio to X-ray) matching the TeV variation and that the TeV sources should not suffer from {gamma}{gamma} absorption due to the flat TeV spectrum, the EIC models are advantageous in modeling the TeV emission from M87. In this paper, we propose a self-consistent EIC model to explain the flat TeV spectrum of M87 within the framework of fully general relativity, where the background soft photons are from the advection-dominated accretion flow around the central black hole, and the high-energy electrons are from the mini-jets that are powered by the magnetic reconnection in the main jet. In our model, both the TeV flares observed in the years 2005 and 2008 could be well explained: the {gamma}{gamma} absorption for TeV photons is very low, even inside the region very close to the black hole 20R{sub g} {approx} 50R{sub g} ; at the same region, the average EIC cooling time ({approx}10{sup 2} {approx} 10{sup 3} s) is short, which is consistent with the observed timescale of the TeV variation. Furthermore, we also discuss the possibility that the accompanying X-ray flare in 2008 is due to the direct synchrotron radiation of the mini-jets.

Cui Yudong; Yuan Yefei [Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Sciences and Technology of China, CAS, Hefei, Anhui 230026 (China); Li Yanrong; Wang Jianmin, E-mail: yfyuan@ustc.edu.cn [Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, CAS, 19B Yuquan Road, Beijing 100049 (China)

2012-02-20T23:59:59.000Z

367

Oilgopoly: a general equilibrium model of the oil-macroeconomy nexus  

E-Print Network (OSTI)

Saudi Arabia is the largest player in the world oil market. It maintains ample spare capacity, restricts investment in developing reserves, and its output is negatively correlated with other OPEC producers. While this behavior does not …t into the perfect competition paradigm, we show that it can be rationalized as that of a dominant producer with competitive fringe. We build a quantitative general equilibrium model along these lines which is capable of matching the historical volatility of the oil price, competitive and non-competitive oil output, and of generating the observed comovement among the oil price, oil quantities, and U.S. GDP. We use our framework to answer questions on which available models are silent: (1) What are the proximate determinants of the oil price and how do they vary over the cycle? (2) How large are oil pro…ts and what losses do they imply for oil-importers? (3) What do di¤erent fundamental shocks imply for the comovement of oil prices and GDP? (4) What are the general equilibrium e¤ects of taxes on oil consumption or oil production? We …nd, in particular, that the existence of an oil production distortion does not necessarily justify an oil consumption tax di¤erent from zero. 1

Anton Nakov Y; Banco De España; Galo Nuño; Banco De España

2009-01-01T23:59:59.000Z

368

The systems edge of the Parameterized Linear Array with a Reconfigurable Pipelined Bus System (LARPBS(p)) optical bus parallel computing model  

Science Conference Proceedings (OSTI)

This paper is about exploring the various systems related aspects pertinent in the recent Parameterized Linear Array with a Reconfigurable Pipelined Bus System (LARPBS(p)) model. The two principal features of the LARPBS(p) model is, firstly, its bridging ... Keywords: Optical bus, Parallel computing model

Brian J. D'Auriol

2009-05-01T23:59:59.000Z

369

Explicit/multi-parametric model predictive control (MPC) of linear discrete-time systems by dynamic and multi-parametric programming  

Science Conference Proceedings (OSTI)

This work presents a new algorithm for solving the explicit/multi-parametric model predictive control (or mp-MPC) problem for linear, time-invariant discrete-time systems, based on dynamic programming and multi-parametric programming techniques. The ... Keywords: Dynamic programming, Explicit Model Predictive Control, Model Predictive Control, Multi-parametric control, Multi-parametric programming

K. I. Kouramas; N. P. Faísca; C. Panos; E. N. Pistikopoulos

2011-08-01T23:59:59.000Z

370

Exact analysis to any order of the linear coupling problem in the thin lens model  

SciTech Connect

In this report we attempt the exact solution of the motion of a charged particle in a circular accelerator under the effects of skew quadrupole errors. We adopt the model of error distributions, lumped in locations with zero extensions. This thin-lens approximation provides an analytical insight to the problem to any order. The total solution is expressed in terms of driving terms which are actually correlation factors to several order. An application follows on the calculation and correction of tune-splitting and on the estimate of the role the higher-order terms play in the correction method.

Ruggiero, A.G.

1991-01-01T23:59:59.000Z

371

Implementing Distributed Systems Using Linear Naming  

E-Print Network (OSTI)

Linear graph reduction is a simple computational model in which the cost of naming things is explicitly represented. The key idea is the notion of "linearity". A name is linear if it is only used once, so with linear ...

Bawden, Alan

1993-03-01T23:59:59.000Z

372

Modeling the Interactions between Aerosols and Liquid Water Clouds with a Self-Consistent Cloud Scheme in a General Circulation Model  

Science Conference Proceedings (OSTI)

To model aerosol–cloud interactions in general circulation models (GCMs), a prognostic cloud scheme of cloud liquid water and amount is expanded to include droplet number concentration (Nd) in a way that allows them to be calculated using the ...

Yi Ming; V. Ramaswamy; Leo J. Donner; Vaughan T. J. Phillips; Stephen A. Klein; Paul A. Ginoux; Larry W. Horowitz

2007-04-01T23:59:59.000Z

373

The component slope linear model for calculating intensive partial molar properties /application to waste glasses and aluminate solutions  

SciTech Connect

Partial molar properties are the changes occurring when the fraction of one component is varied while the fractions of all other component mole fractions change proportionally. They have many practical and theoretical applications in chemical thermodynamics. Partial molar properties of chemical mixtures are difficult to measure because the component mole fractions must sum to one, so a change in fraction of one component must be offset with a change in one or more other components. Given that more than one component fraction is changing at a time, it is difficult to assign a change in measured response to a change in a single component. In this study, the Component Slope Linear Model (CSLM), a model previously published in the statistics literature, is shown to have coefficients that correspond to the intensive partial molar properties. If a measured property is plotted against the mole fraction of a component while keeping the proportions of all other components constant, the slope at any given point on a graph of this curve is the partial molar property for that constituent. Actually plotting this graph has been used to determine partial molar properties for many years. The CSLM directly includes this slope in a model that predicts properties as a function of the component mole fractions. This model is demonstrated by applying it to the constant pressure heat capacity data from the NaOH-NaAl(OH){sub 4}-H{sub 2}O system, a system that simplifies Hanford nuclear waste. The partial molar properties of H{sub 2}O, NaOH, and NaAl(OH){sub 4} are determined. The equivalence of the CSLM and the graphical method is verified by comparing results determined by the two methods. The CSLM model has been previously used to predict the liquidus temperature of spinel crystals precipitated from Hanford waste glass. Those model coefficients are re-interpreted here as the partial molar spinel liquidus temperature of the glass components.

Reynolds, Jacob G. [Washington River Protection Solutions, LLC, Richland, WA (United States)

2013-01-11T23:59:59.000Z

374

Testing linearity in a cointegrating STR model for the money demand function: International evidence from G-7 countries  

Science Conference Proceedings (OSTI)

The motivation behind this paper is to re-investigate the stability of the long-run money demand function (MDF) in a non-linear cointegrating framework for G-7 countries. Previous studies on non-linearity in the MDF are only related to the short-run ... Keywords: G-7 countries, Money demand function, Non-linear cointegration, Smooth transition regression

Chien-Chiang Lee; Pei-Fen Chen; Chun-Ping Chang

2007-12-01T23:59:59.000Z

375

Geometric phase effects in low-energy dynamics near conical intersections: A study of the multidimensional linear vibronic coupling model  

E-Print Network (OSTI)

In molecular systems containing conical intersections (CIs), a nontrivial geometric phase (GP) appears in the nuclear and electronic wave-functions in the adiabatic representation. We study GP effects in nuclear dynamics of an N-dimensional linear vibronic coupling (LVC) model. The main impact of GP on low-energy nuclear dynamics is reduction of population transfer between the local minima of the LVC lower energy surface. For the LVC model, we proposed an isometric coordinate transformation that confines non-adiabatic effects within a two-dimensional subsystem interacting with an N-2 dimensional environment. Since environmental modes do not couple electronic states, all GP effects originate from nuclear dynamics within the subsystem. We explored when the GP affects nuclear dynamics of the isolated subsystem, and how the subsystem-environment interaction can interfere with GP effects. Comparing quantum dynamics with and without GP allowed us to devise simple rules to determine significance of the GP for nuclear dynamics in this model.

Loic Joubert-Doriol; Ilya G. Ryabinkin; Artur F. Izmaylov

2013-10-10T23:59:59.000Z

376

Cross Correlations between the Radiation and Atmospheric Variables in a General Circulation Model and in Satellite Data  

Science Conference Proceedings (OSTI)

The classical picture of the influence of midlatitude troughs on cloud patterns is investigated in a general circulation model (GCM) and in satellite and National Meteorological Centre (NMC) data by comparing the cross correlation of the poleward ...

Thomas P. Charlock; Fred G. Rose; Karen M. Cattany-Cranes

1989-01-01T23:59:59.000Z

377

Transient Planetary Waves Simulated by GFDL Spectral General Circulation Models. Part II: Effects of Nonlinear Energy Transfer  

Science Conference Proceedings (OSTI)

In order to study how transient planetary waves in the midlatitude troposphere are maintained, a space-time spectral analysis over a 1-year data set is made of a GFDL spectral general circulation model.

V. Hayashi; D. G. Golder

1983-04-01T23:59:59.000Z

378

The Surface Energy Balance at Local and Regional Scales-A Comparison of General Circulation Model Results with Observations  

Science Conference Proceedings (OSTI)

Aspects of the mean monthly energy balance at continental surfaces are examined by appeal to the results of general circulation model (GCM) simulations, climatological maps of surface fluxes, and direct observations. Emphasis is placed on net ...

J. R. Garratt; P. B. Krummel; E. A. Kowalczyk

1993-06-01T23:59:59.000Z

379

An Investigation with a General Circulation Model of the Climatic Effects of Cloud Albedo Changes Caused by Atmospheric Pollution  

Science Conference Proceedings (OSTI)

A hemispheric general circulation model, with fixed zonally averaged cloud cover, was used to investigate the climatic impact of increased albedo of low-level clouds caused by atmospheric pollution. The albedo of these clouds was increased from ...

B. G. Hunt

1982-08-01T23:59:59.000Z

380

A Comparison of Climates Simulated by a General Circulation Model when Run in the Annual Cycle and Perpetual Modes  

Science Conference Proceedings (OSTI)

A comparison is made between the climate simulated by the Canadian Climate Centre (CCC) General Circulation Model when run its usual “annual cycle”mode, in which the solar declination angle varies annually, and the climate which is simulated when ...

F. W. Zwiers; G. J. Boer

1987-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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

Interactions between Gravity Waves and Planetary-Scale Flow Simulated by the GFDL “SKYHI” General Circulation Model  

Science Conference Proceedings (OSTI)

In order to study interactions between gravity waves and planetary flow in the middle atmosphere, a 3° latitude by 3.6° longitude version of the 40-level GFDL “SKYHI” general circulation model is analyzed using bihourly sampled output data.

S. Miyahara; Y. Hayashi; J. D. Mahlman

1986-09-01T23:59:59.000Z

382

Plenary lecture 8: on the optimality of a general production lot size inventory models with variable parameters  

Science Conference Proceedings (OSTI)

A general production lot size dynamic inventory model with deteriorating items for which the rates of demand, production, deterioration as well as the cost parameters are arbitrary and known functions of time is considered in this paper. Shortages are ...

Zaid Balkhi

2009-06-01T23:59:59.000Z

383

Gravity Wave Characteristics in the Southern Hemisphere Revealed by a High-Resolution Middle-Atmosphere General Circulation Model  

Science Conference Proceedings (OSTI)

Gravity wave characteristics in the middle- to high-latitude Southern Hemisphere are analyzed using simulation data over 3 yr from a high-resolution middle-atmosphere general circulation model without using any gravity wave parameterizations. ...

Kaoru Sato; Satoshi Tateno; Shingo Watanabe; Yoshio Kawatani

2012-04-01T23:59:59.000Z

384

Hydrological cycles over the Congo and Upper Blue Nile basins: Evaluation of General Circulation Models Simulations and Reanalysis Data Products  

Science Conference Proceedings (OSTI)

The simulations and predictions of the hydrological cycle by General Circulation Models (GCMs) are characterized by a significant degree of uncertainty. This uncertainty is reflected in the range of IPCC (Intergovernmental Panel on Climate Change) ...

Mohamed S. Siam; Marie-Estelle Demory; Elfatih A. B. Eltahir

385

Verification of General Circulation Models Applied to the Hamburg University GCM. Part I: Test of Individual Climate States  

Science Conference Proceedings (OSTI)

One objective of general circulation models is to simulate, e.g., a “January” which is not distinguishable from observed Januaries. A strategy to verify an individual simulated state is proposed. Its main elements are: data compression by means ...

Hans von Storch; Erich Roeckner

1983-10-01T23:59:59.000Z

386

The Albedo Field and Cloud Radiative Forcing Produced by a General Circulation Model with Internally Generated Cloud Optics  

Science Conference Proceedings (OSTI)

A spectral general circulation model (GCM) is run for perpetual January with fixed sea surface temperature conditions. It has internally generated, variable cloud optical properties as well as variable cloud arm and heights. The cloud optics are ...

Thomas P. Charlock; V. Ramanathan

1985-07-01T23:59:59.000Z

387

The Steady-State Atmospheric Circulation Response to Climate Change–like Thermal Forcings in a Simple General Circulation Model  

Science Conference Proceedings (OSTI)

The steady-state extratropical atmospheric response to thermal forcing is investigated in a simple atmospheric general circulation model. The thermal forcings qualitatively mimic three key aspects of anthropogenic climate change: warming in the ...

Amy H. Butler; David W. J. Thompson; Ross Heikes

2010-07-01T23:59:59.000Z

388

An Assessment of Possible Climate Change in the Australian Region Based on an Intercomparison of General Circulation Modeling Results  

Science Conference Proceedings (OSTI)

To assist in estimating likely future climate change in the Australian region, the authors examine the results of four different general circulation modeling experiments run to assess the equilibrium impact of doubling greenhouse gases. The ...

P. H. Whetton; A. B. Pittock; M. R. Haylock; P. J. Rayner

1994-03-01T23:59:59.000Z

389

Comparisons of empirical localization techniques for serial ensemble Kalman filters in a simple atmospheric general circulation model  

Science Conference Proceedings (OSTI)

Two techniques for estimating good localization functions for serial ensemble Kalman filters are compared in observing system simulation experiments (OSSE) conducted with the dynamical core of an atmospheric general circulation model. The first ...

Lili Lei; Jeffrey L. Anderson

390

Effects of Saturated and Dry Land Surfaces on the Tropical Circulation and Precipitation in a General Circulation Model  

Science Conference Proceedings (OSTI)

A comprehensive rhomboidal-15 general circulation model with idealized boundary conditions is used to investigate the effects of interactions between the tropical circulation and continental climate on the precipitation distribution. Sea surface ...

Kerry H. Cook; Anand Gnanadesikan

1991-09-01T23:59:59.000Z

391

A Description of a 1260-Year Control Integration with the Coupled ECHAM1/LSG General Circulation Model  

Science Conference Proceedings (OSTI)

A 1260-yr integration generated by the ECHAM1/LSG (Large Scale Geostrophic) coupled atmosphere–ocean general circulation model is analyzed in this paper. The analysis focuses on the climate drift and on the variations of the coupled atmosphere–...

Jin-Song von Storch; Viatcheslav V. Kharin; Ulrich Cubasch; Gabriele C. Hegerl; Dierk Schriever; Hans von Storch; Eduardo Zorita

1997-07-01T23:59:59.000Z

392

Seasonal Simulations of the Planetary Boundary Layer and Boundary-Layer Stratocumulus Clouds with a General Circulation Model  

Science Conference Proceedings (OSTI)

The UCLA general circulation model (GCM) has been used to simulate the seasonally varying planetary boundary layer (PBL), as well as boundary-layer stratus and stratocumulus clouds. The PBL depth is a prognostic variable of the GCM, incorporated ...

David A. Randall; James A. Abeles; Thomas G. Corsetti

1985-04-01T23:59:59.000Z

393

General Circulation Model Calculations of the Direct Radiative Forcing by Anthropogenic Sulfate and Fossil-Fuel Soot Aerosol  

Science Conference Proceedings (OSTI)

A new radiation code within a general circulation model is used to assess the direct solar and thermal radiative forcing by sulfate aerosol of anthropogenic origin and soot aerosol from fossil-fuel burning. The radiative effects of different ...

J. M. Haywood; D. L. Roberts; A. Slingo; J. M. Edwards; K. P. Shine

1997-07-01T23:59:59.000Z

394

Narrow- and Broad-Band Satellite Measurements of Shortwave Radiation: Conversion Simulations with a General Circulation Model  

Science Conference Proceedings (OSTI)

The Oregon State University/Lawrence Livermore National Laboratory general circulation model has been employed as a vehicle for suggesting and exploring various means of converting narrow-band measurements of reflected solar radiation from the ...

Robert D. Cess; Gerald L. Potter

1986-12-01T23:59:59.000Z

395

A Diagnostic Study of Recurrent Meteorological Anomalies Appearing in a 15-Year Simulation with a GFDL General Circulation Model  

Science Conference Proceedings (OSTI)

The spatial structure and temporal characteristics of prominent anomalies occurring in a 15-year simulation with a GFDL spectral general circulation model are examined using empirical orthogonal functions, teleconnection patterns, composite ...

Ngar-Cheung Lau

1981-11-01T23:59:59.000Z

396

Influence of Land Surface Roughness on Atmospheric Circulation and Precipitation: A Sensitivity Study with a General Circulation Model  

Science Conference Proceedings (OSTI)

The influence of land surface roughness on the large scale atmospheric circulation and rainfall was examined by comparing three sets of simulations made with a general circulation model in which the land surface roughness length, z0, was reduced ...

Y. C. Sud; J. Shukla; Y. Mintz

1988-09-01T23:59:59.000Z

397

A General Circulation Model Study of January Climate Anomaly Patterns Associated with Interannual Variation of Equatorial Pacific Sea Surface Temperatures  

Science Conference Proceedings (OSTI)

A general circulation model has been run in the perpetual January mode to produce several long-term simulations, each distinguished by a different imposed equatorial Pacific sea surface temperature. From each of them simulations we have extracted ...

Maurice L. Blackmon; John E. Geisler; Eric J. Pitcher

1983-06-01T23:59:59.000Z

398

Conservative Semi-Lagrangian Transport on a Sphere and the Impact on Vapor Advection in an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

A conservative semi-Lagrangian scheme with rational function for interpolation is implemented in spherical geometry and tested in an atmospheric general circulation model (AGCM). The new scheme, different from the conventional semi-Lagrangian ...

Xindong Peng; Feng Xiao; Wataru Ohfuchi; Hiromitsu Fuchigami

2005-03-01T23:59:59.000Z

399

Aerosol indirect effects – general circulation model intercomparison and evaluation with satellite data  

Science Conference Proceedings (OSTI)

Aerosol indirect effects continue to constitute one of the most important uncertainties for anthropogenic climate perturbations. Within the international AEROCOM initiative, the representation of aerosol-cloud-radiation interactions in ten different general circulation models (GCMs) is evaluated in the present study using three satellite datasets. The satellite datasets are taken as reference bearing in mind that cloud and aerosol retrievals include uncertainties. We compute statistical relationships between aerosol optical depth (?a) and various cloud and radiation quantities consistently in models and satellite data. It is found that the model-simulated influence of aerosols on cloud droplet number concentration (Nd) compares relatively well to the satellite data at least over oceans. The relationship between ?a and liquid water path is simulated much too strongly by the models. It is shown that this is partly related to rep¬resentation of the second aerosol indirect effect in terms of autoconversion. A positive re¬lationship between total cloud fraction (fcld) and ?a as found in the satellite data is simulated by the majority of the models, albeit less strongly in most of them. In a discussion of the hypo¬theses proposed in the literature to explain the satellite-derived strong fcld – ?a relation¬ship, we find that none is unequivocally confirmed by our results. Relationships similar to the ones found in satellite data between ?a and cloud top tem¬perature and outgoing long-wave radiation (OLR) are simulated by only a few GCMs. The GCMs that simulate a negative OLR - ?a relationship show a strong positive cor¬relation between ?a and cloud fraction. The short-wave total aerosol radiative forcing as simulated by the GCMs is strongly influenced by the simulated anthropogenic fraction of ?a, and parameterisation assumptions such as a lower bound on Nd. Nevertheless, the strengths of the statistical relationships are good predictors for the short-wave total aerosol forcings in the models. An estimate of the total short-wave aerosol forcing inferred from the combination of these predictors for the modelled forcings with the satellite-derived statistical relationships yields a global annual mean value of -1.5±0.5 Wm-2. An alternative estim¬ate obtained by scaling the simulated clear- and cloudy-sky forcings with estimates of anthropogenic ?a and satellite-retrieved Nd – ?a regression slopes, respectively, yields a global annual mean clear-sky (aerosol direct effect) es¬timate of -0.4±0.2 Wm-2 and a cloudy-sky (aerosol indirect effect) estimate of -0.7±0.5 Wm-2, with a total estimate of -1.2±0.4 Wm-2.

Quaas, Johannes; Ming, Yi; Menon, Surabi; Takemura, T.; Wang, Minghuai; Penner, Joyce E.; Gettelman, A.; Lohmann, U.; Bellouin, N.; Boucher, Olivier; Sayer, Andrew M.; Thomas, Gareth E.; McComiskey, A.; Feingold, G.; Hoose, Corinna; Kristjansson, J. E.; Liu, Xiaohong; Balkanski, Y.; Donner, Leo J.; Ginoux, P.; Stier, P.; Grandey, B.; Feichter, J.; Sednev, Igor; Bauer, Susanne E.; Koch, D.; Grainger, Roy G.; Kirkevag, A.; Iversen, T.; Seland, O.; Easter, Richard C.; Ghan, Steven J.; Rasch, Philip J.; Morrison, H.; Lamarque, J. F.; Iacono, Michael J.; Kinne, Stefan; Schulz, M.

2009-11-16T23:59:59.000Z

400

On Stable Piecewise Linearization and Generalized Algorithmic ...  

E-Print Network (OSTI)

never empty, independent of the particular function representation in terms of elemen- .... line-search this zig-zagging leads to convergence to a nonstationary point ...... The truly dependent values y do not directly enter into the incremental ...

Note: This page contains sample records for the topic "general linear model" 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

A Quasi-linear Eddy-Viscosity Model for the Flux of Energy and Momentum to Wind Waves Using Conservation-Law Equations in a Curvilinear Coordinate System  

Science Conference Proceedings (OSTI)

The airflow above ocean waves is calculated using a quasi-linear model—one in which the effect of the waves on the mean flow is taken into account. The model uses curvilinear coordinates, in which one coordinate surface coincides with the ...

Alastair D. Jenkins

1992-08-01T23:59:59.000Z

402

LINEAR ACCELERATOR  

DOE Patents (OSTI)

Improvements in linear particle accelerators are described. A drift tube system for a linear ion accelerator reduces gap capacity between adjacent drift tube ends. This is accomplished by reducing the ratio of the diameter of the drift tube to the diameter of the resonant cavity. Concentration of magnetic field intensity at the longitudinal midpoint of the external sunface of each drift tube is reduced by increasing the external drift tube diameter at the longitudinal center region.

Christofilos, N.C.; Polk, I.J.

1959-02-17T23:59:59.000Z

403

Position Paper: A general framework for Dynamic Emulation Modelling in environmental problems  

Science Conference Proceedings (OSTI)

Emulation modelling is an effective way of overcoming the large computational burden associated with the process-based models traditionally adopted by the environmental modelling community. An emulator is a low-order, computationally efficient model ... Keywords: Dynamic emulation modelling, Metamodelling, Model complexity, Model reduction, Process-based models, Response surfaces

A. Castelletti; S. Galelli; M. Ratto; R. Soncini-Sessa; P. C. Young

2012-06-01T23:59:59.000Z

404

Aerosol indirect effects ? general circulation model intercomparison and evaluation with satellite data  

SciTech Connect

Aerosol indirect effects continue to constitute one of the most important uncertainties for anthropogenic climate perturbations. Within the international AEROCOM initiative, the representation of aerosol-cloud-radiation interactions in ten different general circulation models (GCMs) is evaluated using three satellite datasets. The focus is on stratiform liquid water clouds since most GCMs do not include ice nucleation effects, and none of the model explicitly parameterises aerosol effects on convective clouds. We compute statistical relationships between aerosol optical depth ({tau}{sub a}) and various cloud and radiation quantities in a manner that is consistent between the models and the satellite data. It is found that the model-simulated influence of aerosols on cloud droplet number concentration (N{sub d}) compares relatively well to the satellite data at least over the ocean. The relationship between {tau}{sub a} and liquid water path is simulated much too strongly by the models. This suggests that the implementation of the second aerosol indirect effect mainly in terms of an autoconversion parameterisation has to be revisited in the GCMs. A positive relationship between total cloud fraction (f{sub cld}) and {tau}{sub a} as found in the satellite data is simulated by the majority of the models, albeit less strongly than that in the satellite data in most of them. In a discussion of the hypotheses proposed in the literature to explain the satellite-derived strong f{sub cld} - {tau}{sub a} relationship, our results indicate that none can be identified as a unique explanation. Relationships similar to the ones found in satellite data between {tau}{sub a} and cloud top temperature or outgoing long-wave radiation (OLR) are simulated by only a few GCMs. The GCMs that simulate a negative OLR - {tau}{sub a} relationship show a strong positive correlation between {tau}{sub a} and f{sub cld} The short-wave total aerosol radiative forcing as simulated by the GCMs is strongly influenced by the simulated anthropogenic fraction of {tau}{sub a}, and parameterization assumptions such as a lower bound on N{sub d}. Nevertheless, the strengths of the statistical relationships are good predictors for the aerosol forcings in the models. An estimate of the total short-wave aerosol forcing inferred from the combination of these predictors for the modelled forcings with the satellite-derived statistical relationships yields a global annual mean value of -1.5 {+-} 0.5 Wm{sup -2}. In an alternative approach, the radiative flux perturbation due to anthropogenic aerosols can be broken down into a component over the cloud-free portion of the globe (approximately the aerosol direct effect) and a component over the cloudy portion of the globe (approximately the aerosol indirect effect). An estimate obtained by scaling these simulated clear- and cloudy-sky forcings with estimates of anthropogenic {tau}{sub a} and satellite-retrieved Nd - {tau}{sub a} regression slopes, respectively, yields a global, annual-mean aerosol direct effect estimate of -0.4 {+-} 0.2 Wm{sup -2} and a cloudy-sky (aerosol indirect effect) estimate of -0.7 {+-} 0.5 Wm{sup -2}, with a total estimate of -1.2 {+-} 0.4 Wm{sup -2}.

Quaas, Johannes; Ming, Yi; Menon, Surabi; Takemura, Toshihiko; Wang, Minghuai; Penner, Joyce E.; Gettelman, Andrew; Lohmann, Ulrike; Bellouin, Nicolas; Boucher, Olivier; Sayer, Andrew M.; Thomas, Gareth E.; McComiskey, Allison; Feingold, Graham; Hoose, Corinna; Kristansson, Jon Egill; Liu, Xiaohong; Balkanski, Yves; Donner, Leo J.; Ginoux, Paul A.; Stier, Philip; Grandey, Benjamin; Feichter, Johann; Sednev, Igor; Bauer, Susanne E.; Koch, Dorothy; Grainger, Roy G.; Kirkevag, Alf; Iversen, Trond; Seland, Oyvind; Easter, Richard; Ghan, Steven J.; Rasch, Philip J.; Morrison, Hugh; Lamarque, Jean-Francois; Iacono, Michael J.; Kinne, Stefan; Schulz, Michael

2010-03-12T23:59:59.000Z

405

A Simplified General Circulation Model for a Baroclinic Ocean with Topography. Part I: Theory, Waves, and Wind-Driven Circulations  

Science Conference Proceedings (OSTI)

A new type of ocean general circulation model with simplified physics is described and tested for various simple wind-driven circulation problems. The model consists of the vorticity balance of the depth-averaged flow and a hierarchy of equations ...

Dirk Olbers; Carsten Eden

2003-12-01T23:59:59.000Z

406

General Engineers  

U.S. Energy Information Administration (EIA) Indexed Site

General Engineers General Engineers The U.S. Energy Information Administration (EIA) within the Department of Energy has forged a world-class information program that stresses quality, teamwork, and employee growth. In support of our program, we offer a variety of profes- sional positions, including the General Engineer, whose work is associated with analytical studies and evaluation projects pertaining to the operations of the energy industry. Responsibilities: General Engineers perform or participate in one or more of the following important functions: * Design modeling systems to represent energy markets and the physical properties of energy industries * Conceive, initiate, monitor and/or conduct planning and evaluation projects and studies of continuing and future

407

Linear and Nonlinear Signatures in the Planetary Wave Dynamics of an AGCM: Probability Density Functions  

Science Conference Proceedings (OSTI)

To identify and quantify indications of linear and nonlinear planetary wave behavior and their impact on the distribution of atmospheric states, characteristics of a very long integration of an atmospheric general circulation model (GCM) in a ...

Judith Berner; Grant Branstator

2007-01-01T23:59:59.000Z

408

Effects of cumulus convection on the simulated monsoon circulation in a general circulation model  

SciTech Connect

The effect of cumulus convection on the Asian summer monsoon circulation is investigated, using a general circulation model. Two simulations for the summer months (June, July, and August) are performed, one parameterizing convection using a mass flux scheme and the other without convective parameterization. The results show that convection has significant effects on the monsoon circulation and its associated precipitation. In the simulation with the mass flux convective parameterization, precipitation in the western Pacific is decreased, together with a decrease in surface evaporation and wind speed. In the indian monsoon region it is almost the opposite. Comparison with a simulation using moist convective adjustment to parameterize convection shows that the monsoon circulation and precipitation distribution in the no-convection simulation are very similar to those in the simulation with moist convective adjustment. The difference in the large-scale circulation with and without convective parameterization is interpreted in terms of convective stabilization of the atmosphere by convection, using dry and moist static energy budgets. It is shown that weakening of the low-level convergence in the western Pacific in the simulation with convection is closely associated with the stabilization of the atmosphere by convection, mostly through drying of the lower troposphere; changes in low-level convergence lead to changes in precipitation. The precipitation increase in the Indian monsoon can be explained similarly. 29 refs., 12 figs.

Zhang, Guang Jun (Univ. of California, San Diego, La Jolla, CA (United States))

1994-09-01T23:59:59.000Z

409

Design of active suspension control based upon use of tubular linear motor and quarter-car model  

E-Print Network (OSTI)

The design, fabrication, and testing of a quarter-car facility coupled with various control algorithms are presented in this thesis. An experimental linear tubular motor, capable of producing a 52-N force, provides control actuation to the model. Controllers consisting of two designs were implemented: a classical controller employing lead and lag networks and a state-space feedback design. Each design was extensively simulated to screen for receptiveness to actuation force limitations and robustness regarding the inexact tire modeling. The goal of each controller was to minimize the acceleration of the sprung mass in the presence of simulated road disturbances, modeled by both sinusoidal and step input excitation wheels. Different reference velocity inputs were applied to the control scheme. Responses to a zero reference were juxtaposed to those that resulted from tracking a reference built off a model that incorporated inertial-frame damping attached to the sprung mass. The outcome of this comparison was that low-frequency disturbances were attenuated better when tracking a zero reference, but the reference relaxation introduced by the inertialframe damping model allowed for better-attenuated high frequency signals. Employing an inertial-frame damping value of 250 N-s/m, the rejected frequency component of the system response synchronous with the disturbance input excitation of 40 rad/s bettered by 33% and 28% when feeding control force from the classical controller and state-space controller, respectively. The experimental analysis conducted on the classical and state-space controllers produced sinusoidal disturbance rejection of at worst 50% within their respective bandwidths. At 25 rad/s, the classical controller was able to remove 80% of the base component synchronous with the disturbance excitation frequency, while the state-space controller filtered out nearly 60%. Analysis on the system's ability to reject step disturbances was greatly confounded with the destructive lateral loading transferred during the excitation process. As a result, subjection to excitation could only occur up to 25 rad/s. At the 20 rad/s response synchronous to the disturbance excitation, the classical and state-space controllers removed 85% and 70% of the disturbance, respectively. Sharp spikes in timebased amplitude were present due to the binding that ensued during testing.

Allen, Justin Aaron

2008-08-01T23:59:59.000Z

410

Testing Higgs models via the H{sup {+-}}W{sup {-+}}Z vertex by a recoil method at the International Linear Collider  

SciTech Connect

In general, charged Higgs bosons H{sup {+-}} appear in nonminimal Higgs models. The H{sup {+-}}W{sup {-+}}Z vertex is known to be related to the violation of the global symmetry (custodial symmetry) in the Higgs sector. Its magnitude strongly depends on the structure of the exotic Higgs models which contain higher isospin SU(2){sub L} representations such as triplet Higgs bosons. We study the possibility of measuring the H{sup {+-}}W{sup {-+}}Z vertex via single charged Higgs boson production associated with the W{sup {+-}} boson at the International Linear Collider (ILC) by using the recoil method. The feasibility of the signal e{sup +}e{sup -}{yields}H{sup {+-}}W{sup {-+}}{yields}l{nu}jj is analyzed assuming the polarized electron and positron beams and the expected detector performance for the resolution of the two-jet system at the ILC. The background events can be reduced to a considerable extent by imposing the kinematic cuts even if we take into account the initial state radiation. For a relatively light charged Higgs boson whose mass m{sub H}{sup {+-}} is in the region of 120-130 GeV

Kanemura, Shinya; Yagyu, Kei; Yanase, Kazuya [Department of Physics, University of Toyama, 3190 Gofuku, Toyama 930-8555 (Japan)

2011-04-01T23:59:59.000Z

411

IEEE TRANSACTIONS ON ENERGY CONVERSION, VOL. 27, NO. 2, JUNE 2012 489 Modeling of a Complementary and Modular Linear  

E-Print Network (OSTI)

and Modular Linear Flux-Switching Permanent Magnet Motor for Urban Rail Transit Applications Ruiwu Cao-switching permanent magnet (MLFSPM) motor is investi- gated, in which both the magnets and armature windings incorporates the high power density of a linear permanent magnet synchronous motor and the simple structure

Mi, Chunting "Chris"

412

Benchmark studies of the Bending Corrected Rotating Linear Model (BCRLM) reactive scattering code: Implications for accurate quantum calculations  

SciTech Connect

The Bending Corrected Rotating Linear Model (BCRLM), developed by Hayes and Walker, is a simple approximation to the true multidimensional scattering problem for reaction of the type: A + BC {yields} AB + C. While the BCRLM method is simpler than methods designed to obtain accurate three dimensional quantum scattering results, this turns out to be a major advantage in terms of our benchmarking studies. The computer code used to obtain BCRLM scattering results is written for the most part in standard FORTRAN and has been reported to several scalar, vector, and parallel architecture computers including the IBM 3090-600J, the Cray XMP and YMP, the Ardent Titan, IBM RISC System/6000, Convex C-1 and the MIPS 2000. Benchmark results will be reported for each of these machines with an emphasis on comparing the scalar, vector, and parallel performance for the standard code with minimum modifications. Detailed analysis of the mapping of the BCRLM approach onto both shared and distributed memory parallel architecture machines indicates the importance of introducing several key changes in the basic strategy and algorithums used to calculate scattering results. This analysis of the BCRLM approach provides some insights into optimal strategies for mapping three dimensional quantum scattering methods, such as the Parker-Pack method, onto shared or distributed memory parallel computers.

Hayes, E.F.; Darakjian, Z. (Rice Univ., Houston, TX (USA). Dept. of Chemistry); Walker, R.B. (Los Alamos National Lab., NM (USA))

1990-01-01T23:59:59.000Z

413

Simulation of the Atlantic Circulation with a Coupled Sea Ice-Mixed Layer-Isopycnal General Circulation Model. Part I: Model Description  

Science Conference Proceedings (OSTI)

A diabatic ocean general circulation model based on primitive equations is described. It uses isopycnals as Lagrangian coordinates in the vertical and predicts a free surface. Prognostic fields of temperature and salinity enter the dynamics as ...

Josef M. Oberhuber

1993-05-01T23:59:59.000Z

414

Adjusting to policy expectations in climate change modeling : an interdiciplinary study of flux adjustments in coupled atmosphere-ocean general circulation models  

E-Print Network (OSTI)

This paper surveys and interprets the attitudes of scientists to the use of flux adjustments in climate projections with coupled Atmosphere Ocean General Circulation Models. The survey is based largely on the responses of ...

Shackley, Simon.; Risbey, James; Stone, Peter H.; Wynne, Brian

415

A Generalization of Using an Adjoint Model in Intermittent Data Assimilation Systems  

Science Conference Proceedings (OSTI)

A generalized setup is proposed for the poor man’s 4D variational data assimilation system (PMV) of Huang et al. The new scheme is referred to as a generalization of PMV (GPV) and has the same basic idea as that of PMV, that is, to use an adjoint ...

Xiang-Yu Huang

1999-05-01T23:59:59.000Z

416

COINS: an integrative modelling shell for carbon accounting and general ecological analysis  

Science Conference Proceedings (OSTI)

It is common for a range of models to be developed to investigate broadly similar ecological and environmental phenomena. This inevitably results in collections of models that, although individually possessing unique characteristics, also share a number ... Keywords: Carbon modelling, Model integration, Simulation modelling

S. H. Roxburgh; I. D. Davies

2006-03-01T23:59:59.000Z

417

Application of linear mixed-effect models for the analysis of exam scores: Online video associated with higher scores for undergraduate students with lower grades  

Science Conference Proceedings (OSTI)

In higher education, many of the new teaching interventions are introduced in the format of audio-visual files distributed through the Internet. A pedagogical tool consisting of questions listed as learning objectives and answers presented using online ... Keywords: BSc, CGPA, Exam scores, LME, Linear mixed-effect models, Molecular biology, NMP, NTP, Online videos, PPi, Undergraduate

JoséE Dupuis; JoséE Coutu; Odette Laneuville

2013-08-01T23:59:59.000Z

418

Modeling of decentralized linear observer and tracker for a class of unknown interconnected large-scale sampled-data nonlinear systems with closed-loop decoupling property  

Science Conference Proceedings (OSTI)

A novel low-order modeling of decentralized linear observer-based tracker is presented in this paper for a class of unknown interconnected large-scale sampled-data nonlinear systems with closed-loop decoupling property. The appropriate (low-)order decentralized ... Keywords: Digital redesign, Large-scale system, Observer, Observer/Kalman filter identification, Tracker

Jason Sheng-Hong Tsai; Nien-Tsu Hu; Po-Chuan Yang; Shu-Mei Guo; Leang-San Shieh

2010-08-01T23:59:59.000Z

419

Eddy–Zonal Flow Interactions Associated with the Southern Hemisphere Annular Mode: Results from NCEP–DOE Reanalysis and a Quasi-Linear Model  

Science Conference Proceedings (OSTI)

Using a recent 22-yr (1979–2000) record of the NCEP–Department of Energy (DOE) reanalysis 2 dataset (hereafter, NCEP2 reanalysis) and a two-level spherical quasi-geostrophic, quasi-linear model, the eddy–zonal- mean flow interactions associated ...

Harun A. Rashid; Ian Simmonds

2004-04-01T23:59:59.000Z

420

Compiled code simulation of analog and mixed-signal systems using piecewise linear modeling of nonlinear parameters: A case study for ?? modulator simulation  

Science Conference Proceedings (OSTI)

This paper presents a methodology for fast time-domain simulation of analog systems with nonlinear parameters. Specifically, the paper focuses on @D@S analog-to-digital converters (ADC). The method creates compiled-code simulators based on symbolic analysis. ... Keywords: Analog and mixed-signal systems, Neural networks, Nonlinear modeling, Piecewise linear, Simulation

Hui Zhang; Simona Doboli; Hua Tang; Alex Doboli

2007-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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

Convective Precipitation Variability as a Tool for General Circulation Model Analysis  

Science Conference Proceedings (OSTI)

Precipitation variability is analyzed in two versions of the Community Atmospheric Model (CAM), the standard model, CAM, and a “multiscale modeling framework” (MMF), in which the cumulus parameterization has been replaced with a cloud-resolving ...

Charlotte A. DeMott; David A. Randall; Marat Khairoutdinov

2007-01-01T23:59:59.000Z

422

Changing the Climate Sensitivity of an Atmospheric General Circulation Model through Cloud Radiative Adjustment  

Science Conference Proceedings (OSTI)

Conducting probabilistic climate projections with a particular climate model requires the ability to vary the model’s characteristics, such as its climate sensitivity. In this study, the authors implement and validate a method to change the ...

Andrei P. Sokolov; Erwan Monier

2012-10-01T23:59:59.000Z

423

A Generalized Energy Balance Climate Model with Parameterized Dynamics and Diabatic Heating  

Science Conference Proceedings (OSTI)

Energy balance models have proven useful in understanding mechanisms and feedbacks in the climate system. An original global energy balance model is presented here. The model is solved numerically for equilibrium climate states defined by zonal ...

Karen M. Shell; Richard C. J. Somerville

2005-06-01T23:59:59.000Z

424

Do General Circulation Models Underestimate the Natural Variability in the Arctic Climate?  

Science Conference Proceedings (OSTI)

The authors examine the natural variability of the arctic climate system simulated by two very different models: the Geophysical Fluid Dynamics Laboratory (GFDL) global climate model, and an area-averaged model of the arctic atmosphere–sea ice–...

D. S. Battisti; C. M. Bitz; R. E. Moritz

1997-08-01T23:59:59.000Z

425

Application of Adjoint Sensitivity Theory to an Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

Sensitivity studies with climate models usually involve rerunning the model. Since climate models take so much computer time, this approach can be used to calculate sensitivities to only a few parameters. This work demonstrates the use of a much ...

Matthew C. G. Hall

1986-11-01T23:59:59.000Z

426

Dynamic and Thermodynamic Influences of the Tibetan Plateau on the Atmosphere in a General Circulation Model  

Science Conference Proceedings (OSTI)

The dynamic and thermodynamic influences of the Tibetan Plateau on the temperature geopotential height, horizontal wind, vertical velocity, cloud and precipitation patterns over eastern Asia am physically investigated employing a general ...

Qinglin Zheng; Kuo-Nan Liou

1986-07-01T23:59:59.000Z

427

How Sensitive Are Coarse General Circulation Models to Fundamental Approximations in the Equations of Motion?  

Science Conference Proceedings (OSTI)

The advent of high-precision gravity missions presents the opportunity to accurately measure variations in the distribution of mass in the ocean. Such a data source will prove valuable in state estimation and constraining general circulation ...

Martin Losch; Alistair Adcroft; Jean-Michel Campin

2004-01-01T23:59:59.000Z

428

F-Class Life Management: General Electric MS7001 Model FA  

Science Conference Proceedings (OSTI)

This report reviews the known durability issues that have affected the General Electric 7FA gas turbine. An overview of the approach, technology, and specific issues in the durability analysis of each hot section component is followed by the results of the hot section life management program studies focused on the durability of the three stages of buckets and the first stage nozzle of the General Electric Frame 7FA gas turbines.

2011-12-16T23:59:59.000Z

429

Construction of reduced order models for the non-linear Navier-Stokes equations using the proper orthogonal fecomposition (POD)/Galerkin method.  

SciTech Connect

The construction of stable reduced order models using Galerkin projection for the Euler or Navier-Stokes equations requires a suitable choice for the inner product. The standard L2 inner product is expected to produce unstable ROMs. For the non-linear Navier-Stokes equations this means the use of an energy inner product. In this report, Galerkin projection for the non-linear Navier-Stokes equations using the L2 inner product is implemented as a first step toward constructing stable ROMs for this set of physics.

Fike, Jeffrey A.

2013-08-01T23:59:59.000Z

430

The Structure and Predictability of the “High-Latitude Mode” in the CSIRO9 General Circulation Model  

Science Conference Proceedings (OSTI)

The CSIRO9 general circulation model shows a zonally symmetric mode of variability, which closely resembles the high-latitude mode (HLM) in middle and high latitudes of the Southern Hemisphere. The leading EOF of the zonal mean zonal wind between ...

John W. Kidson; Ian G. Watterson

1999-11-01T23:59:59.000Z

431

Solvation Free Energy of Biomacromolecules: Parameters for a Modified Generalized Born Model Consistent with the AMBER Force Field  

E-Print Network (OSTI)

Solvation Free Energy of Biomacromolecules: Parameters for a Modified Generalized Born Model provides rapid estimates of the electrostatic free energies of solvation for diverse molecules of parameters compatible with the AMBER force field is described. The method is used to estimate free energies

Jayaram, Bhyravabotla

432

A Generalized Biomass Pyrolysis Model Based on Superimposed Cellulose, IIemi-CCIIU1OSC and Lignin Kinetics  

E-Print Network (OSTI)

this paper is to present a model for the numerical simulation of macro-particle of general of the is to predict pyrolysis yields associated with "typical" biomass samples. Potential alterations necessary to account for mineral and moisture content pressure arc postponed for future work. A ncw based on superimposed CC1IU1OSC,

R. S. Miller; J. Bellan; I. Ignin Kinetics; J. Bj. An; Jd Iyqmlsion; Greek Syqbols

1997-01-01T23:59:59.000Z

433

Diagnosing the Annual Cycle of the Equatorial Undercurrent in the Atlantic Ocean from a General Circulation Model  

Science Conference Proceedings (OSTI)

Ten-year-long output series from a general circulation model forced by daily realistic winds are used to analyze the annual cycle of the Equatorial Undercurrent (EUC) in the Atlantic Ocean. Two well-defined transport maxima are found: One, ...

M. Arhan; A. M. Treguier; B. Bourlès; S. Michel

2006-08-01T23:59:59.000Z

434

The Response of a Global Ocean General Circulation Model to Climatological Surface Boundary Conditions for Temperature and Salinity  

Science Conference Proceedings (OSTI)

The response of a global ocean general circulation model (OGCM) to different surface heat and freshwater fluxes is examined. The aim is to determine the most appropriate way to spin up an OGCM prior to coupling it with an atmospheric GCM. ...

Andrew M. Moore; Christopher J. C. Reason

1993-02-01T23:59:59.000Z

435

Comparison of Ocean Surface Solar Irradiance in the GLA General Circulation Model and Satellite-based Calculations  

Science Conference Proceedings (OSTI)

A global, 7-year satellite-based record of ocean surface solar irradiance (SSI) is used to assess the realism of ocean SSI simulated by the nine-layer Goddard Laboratory for Atmospheres (GLA) General Circulation Model (GCM). January and July ...

Beth Chertock; Y. C. Sud

1993-03-01T23:59:59.000Z

436

PLATO: a new piecewise linear simulation tool  

Science Conference Proceedings (OSTI)

This paper describes the basic concepts of a new piecewise linear circuit simulation program called PLATO. Piecewise linear modeling is a very generic and powerful approach to the modeling of electronic components. It allows for the use of macro modeling ...

M. T. van Stiphout; J. T. J. van Eijndhoven; H. W. Buurman

1990-03-01T23:59:59.000Z

437

On the Onset of Inertial Recirculation in Barotropic General Circulation Models  

Science Conference Proceedings (OSTI)

A nonlinear ordinary differential equation which models the western boundary layer of quasi-geostrophic barotropic models of the wind-driven circulation has been investigated by Il'in and Kamenkovich and more recently by Ierley and Ruehr. For ...

Glenn R. Ierley

1987-12-01T23:59:59.000Z

438

Error Estimates for an Ocean General Circulation Model from Altimeter and Acoustic Tomography Data  

Science Conference Proceedings (OSTI)

An offline approach is proposed for the estimation of model and data error covariance matrices whereby covariance matrices of model data residuals are “matched” to their theoretical expectations using familiar least-squares methods. This ...

Dimitris Menemenlis; Michael Chechelnitsky

2000-03-01T23:59:59.000Z

439

Subsidence and Upper-Tropospheric Drying along Trajectories in a General Circulation Model  

Science Conference Proceedings (OSTI)

A trajectory analysis of the Community Climate Model version 3 (CCM3) moisture simulation is used to show that the model simulates upper-tropospheric moisture observations better than would be inferred from a traditional geographical comparison. ...

Eric P. Salathé Jr.; Dennis L. Hartmann

2000-01-01T23:59:59.000Z

440

Modeling the Atmospheric General Circulation Using a Spherical Geodesic Grid: A New Class of Dynamical Cores  

Science Conference Proceedings (OSTI)

This paper documents the development and testing of a new type of atmospheric dynamical core. The model solves the vorticity and divergence equations in place of the momentum equation. The model is discretized in the horizontal using a geodesic ...

Todd D. Ringler; Ross P. Heikes; David A. Randall

2000-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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

A General Filter for Stretched-Grid Models: Application in Cartesian Geometry  

Science Conference Proceedings (OSTI)

Global climate models with variable resolution are effective means to represent regional scales over an area of interest while avoiding the nesting issues of limited-area models. The stretched-grid approach provides a dynamical downscaling ...

Dorina Surcel; René Laprise

2011-05-01T23:59:59.000Z

442

Maintenance of the stratospheric structure in an idealized general circulation model  

Science Conference Proceedings (OSTI)

We explore the maintenance of the stratospheric structure in a primitive equation model that is forced by a Newtonian cooling with a prescribed radiative equilibrium temperature field. Models such as this are well suited to analyze and address ...

M. Jucker; S. Fueglistaler; G. K. Vallis

443

Variability and Coherence of the Agulhas Undercurrent in a High-Resolution Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

The Agulhas Current system has been analyzed in a nested high-resolution ocean model and compared to observations. The model shows good performance in the western boundary current structure and the transports off the South African coast. This ...

A. Biastoch; L. M. Beal; J. R. E. Lutjeharms; T. G. D. Casal

2009-10-01T23:59:59.000Z

444

Thermohaline Structure in the Subarctic North Pacific Simulated in a General Circulation Model  

Science Conference Proceedings (OSTI)

The Miami Isopycnic Coordinate Ocean Model configured with 1° horizontal resolution and 23 layers is used to examine processes that maintain the mesothermal structure, a subsurface temperature inversion, in the subarctic North Pacific. The model ...

Takahiro Endoh; Humio Mitsudera; Shang-Ping Xie; Bo Qiu

2004-02-01T23:59:59.000Z

445

A GRID OF THREE-DIMENSIONAL STELLAR ATMOSPHERE MODELS OF SOLAR METALLICITY. I. GENERAL PROPERTIES, GRANULATION, AND ATMOSPHERIC EXPANSION  

SciTech Connect

Present grids of stellar atmosphere models are the workhorses in interpreting stellar observations and determining their fundamental parameters. These models rely on greatly simplified models of convection, however, lending less predictive power to such models of late-type stars. We present a grid of improved and more reliable stellar atmosphere models of late-type stars, based on deep, three-dimensional (3D), convective, stellar atmosphere simulations. This grid is to be used in general for interpreting observations and improving stellar and asteroseismic modeling. We solve the Navier Stokes equations in 3D and concurrent with the radiative transfer equation, for a range of atmospheric parameters, covering most of stellar evolution with convection at the surface. We emphasize the use of the best available atomic physics for quantitative predictions and comparisons with observations. We present granulation size, convective expansion of the acoustic cavity, and asymptotic adiabat as functions of atmospheric parameters.

Trampedach, Regner [JILA, University of Colorado and National Institute of Standards and Technology, 440 UCB, Boulder, CO 80309 (United States); Asplund, Martin; Collet, Remo [Research School of Astronomy and Astrophysics, Mt. Stromlo Observatory, Cotter Road, Weston ACT 2611 (Australia); Nordlund, Ake [Astronomical Observatory/Niels Bohr Institute, Juliane Maries Vej 30, DK-2100 Copenhagen O (Denmark); Stein, Robert F. [Department of Physics and Astronomy, Michigan State University East Lansing, MI 48824 (United States)

2013-05-20T23:59:59.000Z

446

Quantum corrections to static solutions of phi-in-quadro and Sin-Gordon models via generalized zeta-function  

E-Print Network (OSTI)

A general algebraic method of quantum corrections evaluation is presented. Quantum corrections to a few classical solutions (kinks and periodic) of Ginzburg-Landau (phi-in-quadro) and Sin-Gordon models are calculated in arbitrary dimensions. The Green function for heat equation with a soliton potential is constructed by means of Laplace transformation theory and Hermit equation for the Green function transform. The generalized zeta-function is used to evaluate the functional integral and quantum corrections to mass in quasiclassical approximation.

Leble, Sergey

2008-01-01T23:59:59.000Z

447

An approach to iterative learning control for spatio-temporal dynamics using nD discrete linear systems models  

Science Conference Proceedings (OSTI)

Iterative Learning Control (ILC) is now well established in terms of both the underlying theory and experimental application. This approach is specifically targeted at cases where the same operation is repeated over a finite duration with resetting between ... Keywords: Explicit discretization, Iterative learning control, PDEs, nD linear systems

B?a?ej Cichy; Krzysztof Ga?kowski; Eric Rogers; Anton Kummert

2011-03-01T23:59:59.000Z

448

Generalized beta prior models on fraction defective in reliability test planning  

Science Conference Proceedings (OSTI)

In many reliability analyses, the probability of obtaining a defective unit in a production process should not be considered constant even though the process is stable and in control. Engineering experience or previous data of similar or related products ... Keywords: 62N03, 62N05, Average producer and consumer risks, Generalized beta distribution, Maximum entropy prior, Quantiles, Reliability demonstration sampling plan, Shifted exponential distribution

Arturo J. Fernández; Carlos J. Pérez-González

2012-07-01T23:59:59.000Z

449

AERMOD: A Dispersion Model for Industrial Source Applications. Part I: General Model Formulation and Boundary Layer Characterization  

Science Conference Proceedings (OSTI)

The formulation of the American Meteorological Society (AMS) and U.S. Environmental Protection Agency (EPA) Regulatory Model (AERMOD) Improvement Committee’s applied air dispersion model is described. This is the first of two articles describing ...

Alan J. Cimorelli; Steven G. Perry; Akula Venkatram; Jeffrey C. Weil; Robert?J. Paine; Robert B. Wilson; Russell F. Lee; Warren D. Peters; Roger W. Brode

2005-05-01T23:59:59.000Z

450

Atlantic Thermohaline Circulation in a Coupled General Circulation Model: Unforced Variations versus Forced Changes  

Science Conference Proceedings (OSTI)

A 1200-yr unforced control run and future climate change simulations using the Parallel Climate Model (PCM), a coupled atmosphere–ocean–land–sea ice global model with no flux adjustments and relatively high resolution (2.8° for the atmosphere ...

Aiguo Dai; A. Hu; G. A. Meehl; W. M. Washington; W. G. Strand

2005-08-01T23:59:59.000Z

451

Scale Dependence of Solar Heating Rates in Convective Cloud Systems with Implications to General Circulation Models  

Science Conference Proceedings (OSTI)

The authors examine 3D solar radiative heating rates within tropical convective–cirrus systems to identify the scales that contribute significantly to the spatial average over a climate model’s grid cell (i.e., its grid mean), and determine their ...

A. M. Vogelmann; V. Ramanathan; I. A. Podgorny

2001-04-01T23:59:59.000Z

452

Abyssal Channel Flow in Ocean General Circulation Models with Application to the Vema Channel  

Science Conference Proceedings (OSTI)

An idealized Cox model is shown to pass a flux given by g?H2/2f though a deep channel, single grid-box wide, consistent with analytical models. This flux can, however, be significantly increased or decreased by the presence of density gradients ...

Martin R. Wadley; Grant R. Bigg

1996-01-01T23:59:59.000Z

453

Dynamic Linear Production Games under Uncertainty  

E-Print Network (OSTI)

Oct 2, 2013 ... Abstract: In situations where uncertain costs are shared over time, static ... under uncertainty, generalizing classical linear production games to ...

454

AA Fest General Circulation Model Development: Past, Present and Future. A Symposium in Honor of Professor Akio Arakawa  

SciTech Connect

On January 20-22, 1998, ''AA Fest. A Symposium on General Circulation Model Development: Past, Present, and Future'' was held at the North West Campus Auditorium of University of California, Los Angeles, in honor of Professor Ako Arawaka. The symposium consisted of two-and-a-half-day technical presentations, along with a banquet in the opening evening and a reception during the poster session of the second evening.

Ide, Kayo

1998-01-22T23:59:59.000Z

455

Guideline for the Procurement of Buckets and Nozzles for General Electric MS7001 Model E/EA Gas Turbines  

Science Conference Proceedings (OSTI)

In recent years, a number of aftermarket component suppliers have begun offering replacement 1st, 2nd, and 3rd stage buckets and nozzles for the General Electric (GE) MS7001 Model E and EA gas turbine. Several different designs, materials, and casting processes have been offered for these components for operation over at different peak firing temperatures. This procurement guideline is intended to provide owners with the requirements necessary to procure all three stages of buckets and the first stage no...

2007-03-08T23:59:59.000Z

456

Depth-Integrated Vorticity Budget of the Southern Ocean from a General Circulation Model  

Science Conference Proceedings (OSTI)

An analysis of the depth-integrated vorticity budget of the U.K. Fine Resolution Antarctic Model is used to investigate the mechanisms that maintain and dissipate vorticity in the Antarctic Circumpolar Current (ACC) and adjacent circulations of ...

N. C. Wells; B. A. De Cuevas

1995-11-01T23:59:59.000Z

457

Collective Effects of Organized Convection and Their Approximation in General Circulation Models  

Science Conference Proceedings (OSTI)

The collective effects of organized convection the environment were estimated using a two-dimensional, two-way nested cloud-resolving numerical model with a large outer domain (4500 km). As initial conditions, the authors used an idealized ...

Xiaoqing Wu; Mitchell W. Moncrieff

1996-05-01T23:59:59.000Z

458

A General Pressure Gradient Formulation for Ocean Models. Part I: Scheme Design and Diagnostic Analysis  

Science Conference Proceedings (OSTI)

A Jacobian formulation of the pressure gradient force for use in models with topography-following coordinates is proposed. It can be used in conjunction with any vertical coordinate system and is easily implemented. Vertical variations in the ...

Y. Tony Song

1998-12-01T23:59:59.000Z

459

Effect of a Canopy Interception Reservoir on Hydrological Persistence in a General Circulation Model  

Science Conference Proceedings (OSTI)

Using decadal GCM simulations, the effects of a SVAT (Surface-Vegetation-Atmosphere-Transfer) and a “bucket” land surface parameterization on simulated hydrological persistence are contrasted. The bucket model promotes persistence, as measured by ...

Russell Scott; Randal D. Koster; Dara Entekhabi; Max J. Suarez

1995-07-01T23:59:59.000Z

460

A general model of resource production and exchange in systems of interdependent specialists.  

SciTech Connect

Infrastructures are networks of dynamically interacting systems designed for the flow of information, energy, and materials. Under certain circumstances, disturbances from a targeted attack or natural disasters can cause cascading failures within and between infrastructures that result in significant service losses and long recovery times. Reliable interdependency models that can capture such multi-network cascading do not exist. The research reported here has extended Sandia's infrastructure modeling capabilities by: (1) addressing interdependencies among networks, (2) incorporating adaptive behavioral models into the network models, and (3) providing mechanisms for evaluating vulnerability to targeted attack and unforeseen disruptions. We have applied these capabilities to evaluate the robustness of various systems, and to identify factors that control the scale and duration of disruption. This capability lays the foundation for developing advanced system security solutions that encompass both external shocks and internal dynamics.

Conrad, Stephen Hamilton; Finley, Patrick D.; Beyeler, Walter Eugene; Brown, Theresa Jean; Glass, Robert John, Jr.; Breen, Peter; Kuypers, Marshall; Norton, Matthew David; Quach, Tu-Thach; Antognoli, Matthew; Mitchell, Michael David

2011-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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

A Scheme for Parameterizing Ice-Cloud Water Content in General Circulation Models  

Science Conference Proceedings (OSTI)

The optical properties of ice clouds are a primary issue for climate and climate change. Evaluating these optical properties in three-dimensional models for studying climate will require a method to calculate the ice water content of such clouds. ...

Andrew J. Heymsfield; Leo J. Donner

1990-08-01T23:59:59.000Z

462

Generalized Inversion of Tropical Atmosphere–Ocean Data and a Coupled Model of the Tropical Pacific  

Science Conference Proceedings (OSTI)

It is hypothesized that the circulation of the tropical Pacific Ocean and atmosphere satisfies the equations of a simple coupled model to within errors having specified covariances, and that the Tropical Atmosphere–Ocean array (TAO) measures the ...

Andrew F. Bennett; Boon S. Chua; D. Ed Harrison; Michael J. McPhaden

1998-07-01T23:59:59.000Z

463

Transient Climate Response in Coupled Atmospheric–Ocean General Circulation Models  

Science Conference Proceedings (OSTI)

The equilibrium climate sensitivity (ECS) has a large uncertainty range among models participating in the Intergovernmental Panel on Climate Change (IPCC) Fourth Assessment Report (AR4) and has recently been presented as “inherently unpredictable.”...

Mao-Chang Liang; Li-Ching Lin; Ka-Kit Tung; Yuk L. Yung; Shan Sun

2013-04-01T23:59:59.000Z

464

Re-analysis of deep excavation collapse using a generalized effective stress soil model  

E-Print Network (OSTI)

This thesis re-analyzes the well-documented failure of a 30m deep braced excavation underconsolidated marine clay. Prior analyses of the collapse of the Nicoll Highway have relied on simplified soil models with undrained ...

Corral Jofré, Gonzalo Andrés

2010-01-01T23:59:59.000Z

465

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

466

Design of a Nonhydrostatic Atmospheric Model Based on a Generalized Vertical Coordinate  

Science Conference Proceedings (OSTI)

The isentropic system of equations has particular advantages in the numerical modeling of weather and climate. These include the elimination of the vertical velocity in adiabatic flow, which simplifies the motion to a two-dimensional problem and ...

Michael D. Toy; David A. Randall

2009-07-01T23:59:59.000Z

467

Assimilation of Temperature Profiles in a General Circulation Model of the Tropical Atlantic  

Science Conference Proceedings (OSTI)

Thirty-six hundred temperature profiles collected during 1984 were assimilated into a multilayer primitive equation model of the tropical Atlantic Ocean. The method consists in a monthly correction of the simulated temperature field. Each month, ...

Alain Morliére; Gills Reverdin; Jacques Merle

1989-12-01T23:59:59.000Z

468

Radiative Characteristics of the Canadian Climate Centre Second-Generation General Circulation Model  

Science Conference Proceedings (OSTI)

Several observational datasets were used to assess the quality of the radiative characteristics of the Canadian Climate Centre (CCC) second-generation GCM. The GCM data were obtained from the Atmospheric Model Intercomparison Project (AMIP) ...

Howard W. Barker; Zhanqing Li; Jean-Pierre Blanchet

1994-07-01T23:59:59.000Z

469

Cosmological Imprints of a Generalized Chaplygin Gas Model for the Early Universe  

Science Conference Proceedings (OSTI)

We propose a phenomenological model for the early universe where there is a smooth transition between an early quintessence phase and a radiation-dominated era. The matter content is modeled by an appropriately modified Chaplygin gas for the early universe. We constrain the model observationally by mapping the primordial power spectrum of the scalar perturbations to the latest data of WMAP7. We compute as well the spectrum of the primordial gravitational waves as would be measured today. We show that the high frequencies region of the spectrum depends on the free parameter of the model and most importantly this region of the spectrum can be within the reach of future gravitational waves detectors.

Bouhmadi-Lopez, Mariam; /Lisbon, CENTRA; Chen, Pisin; /Taiwan, Natl. Taiwan U. /KIPAC, Menlo Park /SLAC; Liu, Yen-Wei; /Taiwan, Natl. Taiwan U.

2012-06-06T23:59:59.000Z

470

A General Filter for Stretched-Grid Models: Application in Two-Dimension Polar Geometry  

Science Conference Proceedings (OSTI)

Variable-resolution grids are used in global atmospheric models to improve the representation of regional scales over an area of interest: they have reduced computational cost compared to uniform high-resolution grids, and avoid the nesting issues ...

Dorina Surcel; René Laprise

2012-03-01T23:59:59.000Z

471

Forced and Free Variations of the Surface Temperature Field in a General Circulation Model  

Science Conference Proceedings (OSTI)

The concept of “forced” and “free” variations of large-scale surface temperature is examined by analyzing several long runs of the Community Climate Model (CCMO) with idealized boundary conditions and forcing. 1) The planet is all land with ...

Gerald R. North; Kuor-Jier Joseph Yip; Lai-Yung Leung; Robert M. Chervin

1992-03-01T23:59:59.000Z

472

Seasonal Redistribution and Conservation of Atmospheric Mass in a General Circulation Model  

Science Conference Proceedings (OSTI)

A 10-year run was made with a reduced resolution (T40) version of NMC's medium range forecast model. The 12 monthly mean surface pressure fields averaged over 10 years are used to study the climatological seasonal redistribution of mass ...

Huug M. van den Dool; Suranjana Saha

1993-01-01T23:59:59.000Z

473

Siple Coast Ice Streams in a General Antarctic Ice Sheet Model  

Science Conference Proceedings (OSTI)

In an earlier paper by Verbitsky and Saltzman, a vertically integrated, high-resolution, nonlinearly viscous, nonisothermal ice sheet model was presented to calculate the “present-day” equilibrium regime of the Antarctic ice sheet. Steady-state ...

Mikhail Verbitsky

2005-07-01T23:59:59.000Z

474

Adapting a Beam-Based Rotordynamics Model to Accept a General Three-Dimensional Finite-Element Casing Model  

E-Print Network (OSTI)

The subject of this thesis is an extension of a two-dimensional, axisymmetric, Timoshenko-beam finite-element rotordynamic code to include a three-dimensional non-axisymmetric solid-element casing model. Axisymmetric beams are sufficient to model rotors. Spring and damper forces provide the interface between the rotor and its casing and capture the dynamics of the full model. However, axisymmetric beams limit the modeling of real-case machine structures, where the casing is not axisymmetric. Axisymmetric and non-axisymmetric 3D finite element casing structures are modeled. These structures are then reduced using a technique called substructuring. Modal equations are developed for axisymmetric and non-axisymmetric casing models. In a 3D non-axisymmetric model, structural dynamics modes can be modeled by lateral modes in two orthogonal planes. Modal information of the complex 3D casing structures are generated, and then incorporated into the 2D code after a series of pre-processing steps. A reduction method called Component Mode Synthesis (CMS) is used to reduce the large dimensionality involved in calculation of rotordynamic coefficients. The results from the casing structures are merged with the rotor model to create a combined rotor-casing model. The analysis of the combined structure shows that there is a difference in the natural frequencies and unbalance response between the model that uses symmetrical casing and the one that uses non-axisymmetric casing. XLTRC2 is used as an example of a two-dimensional axisymmetric beam-element code. ANSYS is used as a code to build three-dimensional non-axisymmetric solid-element casing models. The work done in this thesis opens the scope to incorporate complex non-axisymmetric casing models with XLTRC2.

James, Stephen M.

2010-05-01T23:59:59.000Z

475

F-Class Combustion Turbine Life Management: General Electric MS9001 Model FA  

Science Conference Proceedings (OSTI)

The introduction of new, higher firing temperature gas turbine models are often accompanied by durability shortfalls in the hot section and combustion hardware. To some degree, this has been the situation for all the current F-class models. Cycling the machine tends to further compound the stress of high thermal aero loading. Developing a detailed understanding of the design coupled with field experience provides the equipment owner with the basis for adjusting maintenance intervals, and assessing the ef...

2009-03-05T23:59:59.000Z

476

Theoretical analysis of two-gap superconductivity of magnesium diborades and iron pnictides in the generalized {alpha} model  

SciTech Connect

A generalized {alpha} model for computing the superconducting parameters of real two-band superconductors is proposed based on an analysis of the properties of two-band equations in the theory of superconductivity. Using this model, we calculate the heat capacity and optical properties of Ba(Fe{sub 1-x}Co{sub x}){sub 2}As{sub 2} superconducting compound and obtain the temperature dependences of the gaps and energies of the Leggett modes in the Mg{sub 1-x}Al{sub x}B{sub 2} superconducting system. Good quantitative coincidence of the calculated data and experimental results is demonstrated.

Maksimov, E. G. [Russian Academy of Sciences, Lebedev Physical Institute (Russian Federation); Karakozov, A. E., E-mail: karakozov@mtu-net.ru [Russian Academy of Sciences, Vereshchagin Institute for High-Pressure Physics (Russian Federation); Gorshunov, B. P., E-mail: gorshunov@ran.gpi.ru [Russian Academy of Sciences, Prokhorov Institute of General Physics (Russian Federation); Ponomarev, Ya. G. [Moscow State University (Russian Federation); Zhukova, E. S. [Russian Academy of Sciences, Prokhorov Institute of General Physics (Russian Federation); Dressel, M. [Universitaet Stuttgart, 1. Physikalisches Institut (Germany)

2012-08-15T23:59:59.000Z

477

A study of longwave radiation codes for climate studies: Validation with ARM observations and tests in general circulation models  

SciTech Connect

Research by the US Department of Energy (DOE) has shown that cloud radiative feedback is the single most important effect determining the magnitude of possible climatic responses to human activity. However, these effects are still not known at the levels needed for climate prediction. Consequently, DOE has launched a major initiative-- the Atmospheric Radiation Measurements (ARM) Program -- directed at improving the parameterization of the physics governing cloud and radiative processes in general circulation models (GCM's). One specific goal of ARM is to improve the treatment of radiative transfer in GCM's under clear-sky, general overcast and broken cloud conditions. Our approach to developing the radiation model will be to test existing models in an iterative, predictive fashion. We will supply the Clouds and Radiative Testbed (CART) with a set of models to be compared with operationally observed data. The differences we find will lead to the development of new models to be tested with new data. Similarly, our GCM studies will use existing GCM's to study the radiation sensitivity problem. We anticipate that the outcome of this approach will provide both a better longwave radiative forcing algorithm and a better understanding of how longwave radiative forcing influences the equilibrium climate of the atmosphere.

Ellingson, R.G.; Baer, F.

1992-01-01T23:59:59.000Z

478

SECHIBA, a New Set of Parameterizations of the Hydrologic Exchanges at the Land-Atmosphere Interface within the LMD Atmospheric General Circulation Model  

Science Conference Proceedings (OSTI)

A simple parameterization of the hydrologic exchanges between the soil-vegetation system and the atmosphere (SECHIBA) has been developed for use within atmospheric general circulation models (AGCM).

Nathale I. Ducoudré; Katia Laval; Alain Perrier

1993-02-01T23:59:59.000Z

479

Integration of D-dimensional 2-factor spaces cosmological models by reducing to the generalized Emden-Fowler equation  

E-Print Network (OSTI)

The D-dimensional cosmological model on the manifold $M = R \\times M_{1} \\times M_{2}$ describing the evolution of 2 Einsteinian factor spaces, $M_1$ and $M_2$, in the presence of multicomponent perfect fluid source is considered. The barotropic equation of state for mass-energy densities and the pressures of the components is assumed in each space. When the number of the non Ricci-flat factor spaces and the number of the perfect fluid components are both equal to 2, the Einstein equations for the model are reduced to the generalized Emden-Fowler (second-order ordinary differential) equation, which has been recently investigated by Zaitsev and Polyanin within discrete-group analysis. Using the integrable classes of this equation one generates the integrable cosmological models. The corresponding metrics are presented. The method is demonstrated for the special model with Ricci-flat spaces $M_1,M_2$ and the 2-component perfect fluid source.

V. R. Gavrilov; V. N. Melnikov

1998-01-13T23:59:59.000Z

480

A Reduced Grid Method for a Parallel Global Ocean General Circulation Model  

DOE Green Energy (OSTI)

A limitation of many explicit finite-difference global climate models is the timestep restriction caused by the decrease in cell size associated with the convergence of meridians near the poles. A computational grid in which the number of cells in the longitudinal direction is reduced toward high-latitudes, keeping the longitudinal width of the resulting cells as uniform as possible and increasing the allowable timestep, is applied to a three-dimensional primitive equation ocean-climate model. This ''reduced'' grid consists of subgrids which interact at interfaces along their northern and southern boundaries, where the resolution changes by a factor of three. Algorithms are developed to extend the finite difference techniques to this interface, focusing on the conservation required to perform long time integrations, while preserving the staggered spatial arrangement of variables and the numerics used on subgrids. The reduced grid eliminates the common alternative of filtering high-frequency modes from the solution at high-latitudes to allow a larger timestep and reduces execution time per model step by roughly 20 percent. The reduced grid model is implemented for parallel computer architectures with two-dimensional domain decomposition and message passing, with speedup results comparable to those of the original model. Both idealized and realistic model runs are presented to show the effect of the interface numerics on the model solution. First, a rectangular, mid-latitude, at-bottomed basin with vertical walls at the boundaries is driven only by surface wind stress to compare three resolutions of the standard grid to reduced grid cases which use various interface conditions. Next, a similar basin with wind stress, heat, and fresh water forcing is used to compare the results of a reduced grid with those of a standard grid result while exercising the full set of model equations. Finally, global model runs, with topography, forcing, and physical parameters similar to those used for ocean-climate studies, are advanced to a near equilibrium state for both the reduced grid and the standard grid. Differences between the two are presented for typical fields of interest, and very little degradation of the solution due to the reduced grid is observed.

Wickett, M.E.

1999-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "general linear model" 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.


481

User's guide for GSMP, a General System Modeling Program. [In PL/I  

DOE Green Energy (OSTI)

GSMP is designed for use by systems analysis teams. Given compiled subroutines that model the behavior of components plus instructions as to how they are to be interconnected, this program links them together to model a complete system. GSMP offers a fast response to management requests for reconfigurations of old systems and even initial configurations of new systems. Standard system-analytic services are provided: parameter sweeps, graphics, free-form input and formatted output, file storage and recovery, user-tested error diagnostics, component model and integration checkout and debugging facilities, sensitivity analysis, and a multimethod optimizer with nonlinear constraint handling capability. Steady-state or cyclic time-dependence is simulated directly, initial-value problems only indirectly. The code is written in PL/I, but interfaces well with FORTRAN component models. Over the last five years GSMP has been used to model theta-pinch, tokamak, and heavy-ion fusion power plants, open- and closed-cycle magneto-hydrodynamic power plants, and total community energy systems.

Cook, J.M.

1979-10-01T23:59:59.000Z

482

Cloud/Aerosol Parameterizations: Application and Improvement of General Circulation Models  

Science Conference Proceedings (OSTI)

One of the biggest uncertainties associated with climate models and climate forcing is the treatment of aerosols and their effects on clouds. The effect of aerosols on clouds can be divided into two components: The first indirect effect is the forcing associated with increases in droplet concentrations; the second indirect effect is the forcing associated with changes in liquid water path, cloud morphology, and cloud lifetime. Both are highly uncertain. This project applied a cloud-resolving model to understand the response of clouds under a variety of conditions to changes in aerosols. These responses are categorized according to the large-scale meteorological conditions that lead to the response. Meteorological conditions were sampled from various fields, which, together with a global aerosol model determination of the change in aerosols from present day to pre-industrial conditions, was used to determine a first order estimate of the response of global cloud fields to changes in aerosols. The response of the clouds in the NCAR CAM3 GCM coupled to our global aerosol model were tested by examining whether the response is similar to that of the cloud resolving model and methods for improving the representation of clouds and cloud/aerosol interactions were examined.

Penner, Joyce

2012-06-30T23:59:59.000Z

483

Linear Quadratic  

E-Print Network (OSTI)

The proposal of Reshef et. al. (“MIC”) is an interesting new approach for discovering non-linear dependencies among pairs of measurements in exploratory data mining. However, it has a potentially serious drawback. The authors laud the fact that MIC has no preference for some alternatives over others, but as the authors know, there is no free lunch in Statistics: tests which strive to have high power against all alternatives can have low power in many important situations. To investigate this, we ran simulations to compare the power of MIC to that of standard Pearson correlation and distance correlation (dcor) Székely & Rizzo (2009). We simulated pairs of variables with different relationships (most of which were considered by the Reshef et. al.), but with varying levels of noise added. To determine proper cutoffs for testing the independence hypothesis, we simulated independent data with the appropriate marginals. As one can see from the Figure, MIC has lower power than dcor, in every case except the somewhat pathological

Noah Simon; Robert Tibshirani; Noah Simon; Robert Tibshirani

2011-01-01T23:59:59.000Z

484

Toward a General Theory for Multiphase Turbulence Part I: Development and Gauging of the Model Equations  

SciTech Connect

A formalism for developing multiphase turbulence models is introduced by analogy to the phenomenological method used for single-phase turbulence. A sample model developed using the formalism is given in detail. The procedure begins with ensemble averaging of the exact conservation equations, with closure accomplished by using a combination of analytical and experimental results from the literature. The resulting model is applicable to a wide range of common multiphase flows including gas-solid, liquid-solid and gas-liquid (bubbly) flows. The model is positioned for ready extension to three-phase turbulence, or for use in two-phase turbulence in which one phase is accounted for in multiple size classes, representing polydispersivity. The formalism is expected to suggest directions toward a more fundamentally based theory, similar to the way that early work in single-phase turbulence has led to the spectral theory. The approach is unique in that a portion of the total energy decay rate is ascribed to each phase, as is dictated by the exact averaged equations, and results in a transport equation for energy decay rate associated with each phase. What follows is a straightforward definition of a turbulent viscosity for each phase, and accounts for the effect of exchange of fluctuational energy among phases on the turbulent shear viscosity. The model also accounts for the effect of slip momentum transfer among the phases on the production of turbulence kinetic energy and on the tensor character of the Reynolds stress. Collisional effects, when appropriate, are included by superposition. The model reduces to a standard form in limit of a single, pure material, and is expected to do a credible job of describing multiphase turbulent flows in a wide variety of regimes using a single set of coefficients.

B. A. Kashiwa; W. B. VanderHeyden

2000-12-01T23:59:59.000Z

485

Density-Driven General Circulation in a Closed Basin Using a Two-Lavel Model  

Science Conference Proceedings (OSTI)

A rectangular-basin ocean, driven by buoyancy and density fluxes in its northern and southern portions, is studied using a two-level model. Only baroclinic motion is induced under the conditions of 1) no wind, 2) neither interfacial nor bottom ...

Motoyoshi Ikeda

1986-05-01T23:59:59.000Z

486

Numerical Experiments with a General Circulation Model Concerning the Distribution of Ozone in the Stratosphere  

Science Conference Proceedings (OSTI)

Two experiments were performed with a nine-layer quasi-geostrophic spectral model to simulate the distribution of ozone below 60 km. Experiment I included thermal and orographic forcing of the planetary-scale waves while Experiment II did not ...

R. J. Kurzeja; K. V. Haggard; W. L. Grose

1984-07-01T23:59:59.000Z

487

The Extratropical 40-Day Oscillation in the UCLA General Circulation Model. Part II: Spatial Structure  

Science Conference Proceedings (OSTI)

Intraseasonal oscillations in a 3-yr, perpetual-January simulation are examined using a version of the UCLA GCM that produces no self-sustained Madden–Julian oscillation in the Tropics. A robust, 40-day oscillation is found to arise in the model'...

S. L. Marcus; M. Ghil; J. O. Dickey

1996-07-01T23:59:59.000Z

488

Cash Flow Forecasting Model for General Contractors Using Moving Weights of Cost Categories  

E-Print Network (OSTI)

. Navon's model 1995, 1997 automatically in- tegrates the bill of quantity BOQ , cost estimate. Moreover, the main obstacle to automating the integration process is compatibility between cost items, and equipment which are specified as percentages of total cost. This approach is very realistic because

Sheridan, Jennifer

489

International Association for Ecology Extrapolating Leaf CO Exchange to the Canopy: A Generalized Model of Forest  

E-Print Network (OSTI)

, Petersham, Massachusetts, collected by the eddy-correlation tech- nique. A model (PnET-Day) is presented a mercury thermometer in a small clearing outside the main Harvard Forest office, Petersham, Massachusetts, Petersham, MA. Ecol Appi (in press) Martin ME, Aber JD (1995) Estimating forest canopy chemistry

New Hampshire, University of

490

Preliminary and Incomplete 1 General Equilibrium of a Monetary Model with State-Dependent Pricing ?  

E-Print Network (OSTI)

There is a long standing debate on whether nominal shocks have real effects on the economy. According to one theory, frictions in the price adjustment process can lead to the non-neutrality of money. Macroeconomic models of optimal price setting that nest these price adjustment frictions, however, have proven to be difficult to construct and apply to the data. This paper provides a rational expectations equilibrium model of optimal price setting that is solved numerically. The solution requires the speciÞcation and estimation of a price forecast rule. The structural parameters of the model, focusing on the parameters of the price adjustment cost process, are estimated through an indirect inference procedure using aggregate data from the U.S. economy. According to the estimated results, large and variable adjustment costs are required for the model to match up against U.S. data. This paper is a revised version of the third chapter of my Ph.D. dissertation. I would like to thank Russell Cooper, Simon Gilchrist, John Leahy, and Chris House for their valuable comments. The views expressed herein are solely those of the author and do not necessarily reßect the views of the Federal

Jonathan L. Willis

2000-01-01T23:59:59.000Z

491

Non-Linear Integral Equations for the SL(2,R)/U(1) black hole sigma model  

E-Print Network (OSTI)

It was previously established that the critical staggered XXZ spin chain provides a lattice regularization of the black hole CFT. We reconsider the continuum limit of this spin chain with the exact method of non-linear integral equations (NLIEs), paying particular attention to the effects of a singular integration kernel. With the help of the NLIEs, we rederive the continuous black hole spectrum, but also numerically match the density of states of the spin chain with that of the CFT, which is a new result. Finally, we briefly discuss the integrable structure of the black hole CFT and the identification of its massive integrable perturbation on the lattice.

Constantin Candu; Yacine Ikhlef

2013-06-11T23:59:59.000Z

492

Non-Linear Integral Equations for the SL(2,R)/U(1) black hole sigma model  

E-Print Network (OSTI)

It was previously established that the critical staggered XXZ spin chain provides a lattice regularization of the black hole CFT. We reconsider the continuum limit of this spin chain with the exact method of non-linear integral equations (NLIEs), paying particular attention to the effects of a singular integration kernel. With the help of the NLIEs, we rederive the continuous black hole spectrum, but also numerically match the density of states of the spin chain with that of the CFT, which is a new result. Finally, we briefly discuss the integrable structure of the black hole CFT and the identification of its massive integrable perturbation on the lattice.

Candu, Constantin

2013-01-01T23:59:59.000Z

493

Quantum corrections to static solutions of Nahm equation and Sin-Gordon models via generalized zeta-function  

E-Print Network (OSTI)

One-dimensional Yang-Mills Equations are considered from a point of view of a class of nonlinear Klein-Gordon-Fock models. The case of self-dual Nahm equations and non-self-dual models are discussed. A quasiclassical quantization of the models is performed by means of generalized zeta-function and its representation in terms of a Green function diagonal for a heat equation with the correspondent potential. It is used to evaluate the functional integral and quantum corrections to mass in the quasiclassical approximation. Quantum corrections to a few periodic (and kink) solutions of the Nahm as a particular case of the Ginzburg-Landau (phi-in-quadro) and and Sin-Gordon models are evaluated in arbitrary dimensions. The Green function diagonal for heat equation with a finite-gap potential is constructed by universal description via solutions of Hermit equation. An alternative approach based on Baker-Akhiezer functions for KP equation is proposed . The generalized zeta-function and its derivative at zero point as ...

Leble, Sergey

2008-01-01T23:59:59.000Z

494

A Two-Layer Model with Empirical Linear Corrections and Reduced Order for Studies of Internal Climate Variability  

Science Conference Proceedings (OSTI)

This work discusses the formulation and testing of a simplified model of atmospheric dynamics. The model, which has only 200- and 700-mb streamfunctions as its prognostic fields, is designed to have a climate that approximates that of a ...

Ulrich Achatz; Grant Branstator

1999-09-01T23:59:59.000Z

495

Integrating Bioenergy into Computable General Equilibrium Models – A Survey. Kiel Working Paper 1473. Kiel Institute for the World  

E-Print Network (OSTI)

Abstract: In the past years biofuels have received increased attention since they were believed to contribute to rural development, energy security and to fight global warming. It became clear, though, that bioenergy cannot be evaluated independently of the rest of the economy and that national and international feedback effects are important. Computable general equilibrium (CGE) models have been widely employed in order to study the effects of international climate policies. The main characteristic of these models is their encompassing scope: Global models cover the whole world economy disaggregated into regions and countries as well as diverse sectors of economic activity. Such a modelling framework unveils direct and indirect feedback effects of certain policies or shocks across sectors and countries. CGE models are thus well suited for the study of bioenergy/biofuel policies. One can currently find various approaches in the literature of incorporating bioenergy into a CGE framework. This paper gives an overview of existing approaches, critically assesses their respective power and discusses the advantages of CGE models compared to partial equilibrium models. Grouping different approaches into categories and highlighting their advantages and disadvantages is important for giving a structure to this rather recent and rapidly growing research area and to provide a guidepost for future work.

Bettina Kretschmer; Bettina Kretschmer; Sonja Peterson; Bettina Kretschmer; Sonja Peterson

2008-01-01T23:59:59.000Z

496

Development of a Two-Dimensional Zonally Averaged Statistical-Dynamical Model.Part II: The Role of Eddy Momentum Fluxes in the General Circulation and their Parameterization  

Science Conference Proceedings (OSTI)

The effect of eddy momentum fluxes on the general circulation is investigated with the aid of perpetual January simulations with a two-dimensional, zonally averaged model. Sensitivity experiments with this model show that the vertical eddy flux ...

Peter H. Stone; Mao-Sung Yao

1987-12-01T23:59:59.000Z

497

Seasonal Near-Surface Dynamics and Thermodynamics of the Indian Ocean and Indonesian Throughflow in a Global Ocean General Circulation Model  

Science Conference Proceedings (OSTI)

The near-surface dynamics and thermodynamics of the Indian Ocean are examined in a global ocean general circulation model (OGCM) with enhanced tropical resolution. The model uses a Seager-type heat flux formulation (weak relaxation toward a fixed ...

A. Schiller; J. S. Godfrey; P. C. McIntosh; G. Meyers; S. E. Wijffels

1998-11-01T23:59:59.000Z

498

Sensitivity of the Aerosol Indirect Effect to Subgrid Variability in the Cloud Parameterization of the GFDL Atmosphere General Circulation Model AM3  

Science Conference Proceedings (OSTI)

The recently developed GFDL Atmospheric Model version 3 (AM3), an atmospheric general circulation model (GCM), incorporates a prognostic treatment of cloud drop number to simulate the aerosol indirect effect. Since cloud drop activation depends on ...

Jean-Christophe Golaz; Marc Salzmann; Leo J. Donner; Larry W. Horowitz; Yi Ming; Ming Zhao

2011-07-01T23:59:59.000Z

499

Delocalized and Resonant Quantum Transport in Nonlinear Generalizations of the Kicked Rotor Model  

E-Print Network (OSTI)

We analyze the effects of a nonlinear cubic perturbation on the delta-Kicked Rotor. We consider two different models, in which the nonlinear term acts either in the position or in the momentum representation. We numerically investigate the modifications induced by the nonlinearity in the quantum transport in both localized and resonant regimes and a comparison between the results for the two models is presented. Analyzing the momentum distributions and the increase of the mean square momentum, we find that the quantum resonances asymptotically are very stable with respect to the nonlinear perturbation of the rotor's phase evolution. For an intermittent time regime, the nonlinearity even enhances the resonant quantum transport, leading to superballistic motion.

Laura Rebuzzini; Sandro Wimberger; Roberto Artuso

2004-10-12T23:59:59.000Z

500

Chaplygin gas and effective description of inhomogeneous universe models in general relativity  

E-Print Network (OSTI)

In the framework of spatially averaged inhomogeneous cosmologies in classical general relativity, effective Einstein equations govern the dynamics of averaged scalar variables in a scale--dependent way. A particular cosmology may be characterized by a cosmic equation of state, closing the hierarchy of effective equations. In this context a natural candidate is provided by the Chaplygin gas, standing for a unified description of dark energy and dark matter. In this paper, we suppose that the inhomogeneous properties of matter and geometry obey the Chaplygin equation of state. The most extreme interpretation assumes that both dark energy and dark matter are not included as additional sources, but are both manifestations of spatial geometrical properties. This feature is an important conceptual difference in comparison with the standard approach of a Friedmann-Lema\\^itre-Robertson-Walker universe filled with dust and another fundamental field characterized by the Chaplygin equation of state. We finally discuss the consequences of the resulting scenario for effective cosmological parameters in order to establish the framework of a future confrontation with observations, and we note that the standard Chaplygin gas may not be ruled out by them.

Xavier Roy; Thomas Buchert

2009-09-23T23:59:59.000Z