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1

Ocean General Circulation Models  

SciTech Connect (OSTI)

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

2

Aluminium in an ocean general circulation model  

E-Print Network [OSTI]

;Forcing: currents Figure: Velocity (m/s) at ocean surface, average of an OPA climatology Marco van Hulten: Aluminium in an ocean general circulation model 5 #12;Forcing: currents Figure: Atlantic OverturningAluminium in an ocean general circulation model Marco van Hulten November 15, 2011 This research

Haak, Hein

3

Why is the AMOC Monostable in Coupled General Circulation Models?  

Science Journals Connector (OSTI)

This paper is concerned with the question: why do coupled general circulation models (CGCM) seem to be biased toward a monostable Atlantic meridional overturning circulation (AMOC)? In particular, the authors investigate whether the monostable ...

Wei Liu; Zhengyu Liu; Esther C. Brady

2014-03-01T23:59:59.000Z

4

Synchronous and Asynchronous Integrations in an Ocean General Circulation Model  

Science Journals Connector (OSTI)

A basinwide ocean general circulation model of the North Pacific is used to study the difference in distributions of tracers between asynchronous and synchronous integrations. An integration in which equal time steps and no depth acceleration are ...

Yongfu Xu; Shigeaki Aoki; Koh Harada

2002-01-01T23:59:59.000Z

5

Spatial Correlations in General Circulation Models and Observation Reanalysis  

E-Print Network [OSTI]

Comprehensive Ocean-Atmosphere Data Set CCSM4 Community Climate System Model Version 4 CM3 Climate Model Version 3 Mk3 Mark 3.0 CM5A Climate Model Version 5A ESM Earth System Model OBS Observations REA Reanalysis picontrol Pre-Industrial Control Run GCM General... ESM 1.9? × 1.9? 1000 IPSL CM5A 1.9? × 3.75? 1000 CSIRO MK3 3.2? × 5.6? 1000 NCDC OBS 5? × 5? - NCEP REA 2.5? × 2.5? 65 3.1 General Circulation Models GCMs are useful tools for understanding the roles of the major climate system components. Analyses...

Sansom, Taylor Lee

2014-06-19T23:59:59.000Z

6

Application of Improved Radiation Modeling to General Circulation Models  

SciTech Connect (OSTI)

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

7

Posters A Stratiform Cloud Parameterization for General Circulation Models  

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

8

Extreme Precipitation in an Atmosphere General Circulation Model: Impact of Horizontal and Vertical Model Resolution  

Science Journals Connector (OSTI)

To investigate the influence of atmospheric model resolution on the representation of daily precipitation extremes, ensemble simulations with the atmospheric general circulation model ECHAM5 at different horizontal (T213 to T31) and vertical (L31 ...

Claudia Volosciuk; Douglas Maraun; Vladimir A. Semenov; Wonsun Park

9

ENSO Bred Vectors in Coupled Ocean–Atmosphere General Circulation Models  

Science Journals Connector (OSTI)

The breeding method has been implemented in the NASA Seasonal-to-Interannual Prediction Project (NSIPP) coupled general circulation model (CGCM) with the ultimate goal of improving operational seasonal to interannual climate predictions through ...

S-C. Yang; E. Kalnay; M. Cai; M. Rienecker; G. Yuan; Z. Toth

2006-04-01T23:59:59.000Z

10

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

Science Journals Connector (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

11

Earth Radiation Budget and Cloudiness Simulations with a General Circulation Model  

Science Journals Connector (OSTI)

The UCLA/GLA general circulation model has been endowed with new parameterizations of solar and terrestrial radiation, as well as new parameterized cloud optical properties. A simple representation of the cloud liquid water feedback is included. ...

Harshvardhan; David A. Randall; Thomas G. Corsetti

1989-07-01T23:59:59.000Z

12

Moisture Asymmetry and MJO Eastward Propagation in an Aquaplanet General Circulation Model  

Science Journals Connector (OSTI)

The role of zonal moisture asymmetry in the eastward propagation of the Madden–Julian oscillation (MJO) is investigated through a set of aquaplanet atmospheric general circulation model (AGCM) experiments with a zonally symmetric sea surface ...

Pang-Chi Hsu; Tim Li; Hiroyuki Murakami

2014-12-01T23:59:59.000Z

13

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

Science Journals Connector (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

14

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

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

15

Width of the Hadley cell in simple and comprehensive general circulation models  

E-Print Network [OSTI]

Width of the Hadley cell in simple and comprehensive general circulation models Dargan M. W; published 19 September 2007. [1] The width of the Hadley cell is studied over a wide range of climate surface temperature lower boundary conditions are used in both models to study the response of the Hadley

Chen, Gang

16

GENERAL CIRCULATION Mean Characteristics  

E-Print Network [OSTI]

of California, Department of Land, Air, and Water Resources, Davis, CA 95616-8627, USA Introduction state. The general circulation undergoes seasonal change. In many fields the seasonal change is much on an annual average. Simple geometry (see Figure 1) shows that the amount of solar radiation reaching unit

Grotjahn, Richard

17

Status and Improvements of Coupled General Circulation Models  

Science Journals Connector (OSTI)

...change impacts; and (iv) be a firmer basis for Earth system models that describe the feedbacks of societies to climate...change impacts; and (iv) be a firmer basis for Earth system models that describe the feedbacks of societies to climate...

Hartmut Grassl

2000-06-16T23:59:59.000Z

18

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

SciTech Connect (OSTI)

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

19

Enhancing the resolution of sea ice in long-term global ocean general circulation model (gcm) integrations  

E-Print Network [OSTI]

Open water in sea ice, such as leads and polynyas, plays a crucial role in determining the formation of deep- and bottom-water, as well as their long-term global properties and circulation. Ocean general circulation models (GCMs) designed...

Kim, Joong Tae

2007-09-17T23:59:59.000Z

20

Hydrological Cycles over the Congo and Upper Blue Nile Basins: Evaluation of General Circulation Model Simulations and Reanalysis Products  

Science Journals Connector (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 Intergovernmental Panel on Climate Change (IPCC) ...

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

2013-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "general circulation models" 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

Dependence of Tropospheric Temperature on the Parameterization of Cumulus Convection in the GLAS Model of the General Circulation  

Science Journals Connector (OSTI)

Analysis of the simulation of seasonal change by the GLAS model of the general circulation reveals deficiencies in the simulation of tropospheric temperature and of convective cloud cover. These interrelated deficiencies are due to a spurious ...

H. Mark Helfand

1981-01-01T23:59:59.000Z

22

Hydrological Cycles over the Congo and Upper Blue Nile Basins: Evaluation of General Circulation Model Simulations and Reanalysis Products  

E-Print Network [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 Intergovernmental Panel ...

Demory, Marie-Estelle

23

Simulated climatology of a general circulation model with a hydrological cycle  

E-Print Network [OSTI]

The thermal and dynamical structure of the tropical atmosphere which emerged from the numerical integration of our general circulation model with a simple hydrologic cycle is analyzed in detail. According to the results of our analysis, the lapse rate of zonal mean temperature in the model Tropics is supermoist-adiabatic in the lower troposphere, and is sub-moist-adiabatic above the 400-mb. level in qualitative agreement with thc observed features in the actual Tropics. The flow field in the model Tropics also displays interesting features. For example, a zone of strong convergence and a belt of heavy rain develops around the equator. Synoptic-scale disturbances such as weak tropical cyclones and shear lines with strong convergence develop and are reminiscent of disturbances in the actual tropical atmosphere. The humid towers, which result from moist convective adjustment and condensation, develop in the central core of the regions of strong upward motion, sometimes reaching the level of the tropical tropopause and thus heating the upper tropical troposphere. This heating compensates for thc cooling due to radiation and the meridional circulation. According to the analysis of the energy budget of the model Tropics, the release of eddy available potential energy, which is mainly generated by the heat of condensation, constitutes the major source of eddy kinetic energy of disturbances prevailing in the model Tropics.

Syukuro Manabe; Joseph Smagorinsky

1965-01-01T23:59:59.000Z

24

Preliminary design of dust lifting and transport in the martian General Circulation Model.  

E-Print Network [OSTI]

by the GCM When wind blows accross a surface covered by loose particles, kinetic energy is transferred Package 4 1 #12; Contents 1 Introduction 2 2 Dust lifting 3 2.1 Lifting by the general circulation winds . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1.4 Implementation in the GCM. . . . . . . . . . . . . . . . . 6 2.2 Lifting by dust devils

Forget, François

25

Precipitation response to land subsurface hydrologic processes in atmospheric general circulation model simulations  

E-Print Network [OSTI]

the ascending branch of the Hadley circulation. This processprecipitation. [ 18 ] The Hadley circulation over land (ascending branch of the Hadley circulation in the Northern

Lo, Min-Hui; Famiglietti, James S

2011-01-01T23:59:59.000Z

26

Atmospheric radiation measurement: A program for improving radiative forcing and feedback in general circulation models  

SciTech Connect (OSTI)

The Atmospheric Radiation Measurement (ARM) Program is a key element of the Department of Energy`s (DOE`s) global change research strategy. ARM represents a long-term commitment to conduct comprehensive studies of the spectral atmospheric radiative energy balance profile for a wide range of cloud conditions and surface types, and to develop the knowledge necessary to improve parameterizations of radiative processes under various cloud regimes for use in general circulation models (GCMs) and related models. The importance of the ARM program is a apparent from the results of model assessments of the impact on global climate change. Recent studies suggest that radiatively active trace gas emissions caused by human activity can lead to a global warming of 1.5 to 4.5 degrees Celsius and to important changes in water availability during the next century (Cess, et al. 1989). These broad-scale changes can be even more significant at regional levels, where large shifts in temperature and precipitation patterns are shown to occur. However, these analyses also indicate that considerable uncertainty exists in these estimates, with the manner in which cloud radiative processes are parameterized among the most significant uncertainty. Thus, although the findings have significant policy implications in assessment of global and regional climate change, their uncertainties greatly influence the policy debate. ARM`s highly focused observational and analytical research is intended to accelerate improvements and reduce key uncertainties associated with the way in which GCMs treat cloud cover and cloud characteristics and the resulting radiative forcing. This paper summarizes the scientific context for ARM, ARM`s experimental approach, and recent activities within the ARM program.

Patrinos, A.A. [USDOE, Washington, DC (United States); Renne, D.S.; Stokes, G.M. [Pacific Northwest Lab., Richland, WA (United States); Ellingson, R.G. [Maryland Univ., College Park, MD (United States)

1991-01-01T23:59:59.000Z

27

Atmospheric radiation measurement: A program for improving radiative forcing and feedback in general circulation models  

SciTech Connect (OSTI)

The Atmospheric Radiation Measurement (ARM) Program is a key element of the Department of Energy's (DOE's) global change research strategy. ARM represents a long-term commitment to conduct comprehensive studies of the spectral atmospheric radiative energy balance profile for a wide range of cloud conditions and surface types, and to develop the knowledge necessary to improve parameterizations of radiative processes under various cloud regimes for use in general circulation models (GCMs) and related models. The importance of the ARM program is a apparent from the results of model assessments of the impact on global climate change. Recent studies suggest that radiatively active trace gas emissions caused by human activity can lead to a global warming of 1.5 to 4.5 degrees Celsius and to important changes in water availability during the next century (Cess, et al. 1989). These broad-scale changes can be even more significant at regional levels, where large shifts in temperature and precipitation patterns are shown to occur. However, these analyses also indicate that considerable uncertainty exists in these estimates, with the manner in which cloud radiative processes are parameterized among the most significant uncertainty. Thus, although the findings have significant policy implications in assessment of global and regional climate change, their uncertainties greatly influence the policy debate. ARM's highly focused observational and analytical research is intended to accelerate improvements and reduce key uncertainties associated with the way in which GCMs treat cloud cover and cloud characteristics and the resulting radiative forcing. This paper summarizes the scientific context for ARM, ARM's experimental approach, and recent activities within the ARM program.

Patrinos, A.A. (USDOE, Washington, DC (United States)); Renne, D.S.; Stokes, G.M. (Pacific Northwest Lab., Richland, WA (United States)); Ellingson, R.G. (Maryland Univ., College Park, MD (United States))

1991-01-01T23:59:59.000Z

28

Aerosol indirect effects -- general circulation model intercomparison and evaluation with satellite data  

SciTech Connect (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 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 parameterizes aerosol effects on convective clouds. We compute statistical relationships between aerosol optical depth (Ta) 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 (Nd) compares relatively well to the satellite data at least over the ocean. The relationship between Ta and liquid water path is simulated much too strongly by the models. It is shown that this is partly related to the representation of the second aerosol indirect effect in terms of autoconversion. A positive relationship between total cloud fraction (fcld) and Ta 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 fcld - Ta relationship, our results indicate that none can be identified as unique explanation. Relationships similar to the ones found in satellite data between Ta and cloud top temperature or outgoing long-wave radiation (OLR) are simulated by only a few GCMs. The GCMs that simulate a negative OLR - Ta relationship show a strong positive correlation between Ta and fcld The short-wave total aerosol radiative forcing as simulated by the GCMs is strongly influenced by the simulated anthropogenic fraction of Ta, and parameterisation assumptions such as a lower bound on Nd. 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-2. An alternative estimate obtained by scaling the simulated clear- and cloudy-sky forcings with estimates of anthropogenic Ta and satellite-retrieved Nd - Ta regression slopes, respectively, yields a global annual mean clear-sky (aerosol direct effect) estimate 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, 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; Kristjansson, Jon Egill; Liu, Xiaohong; Balkanski, Yves; Donner, Leo J.; Ginoux, Paul A.; Stier, Philip; 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

2009-04-10T23:59:59.000Z

29

Carbon-nitrogen interactions regulate climate-carbon cycle feedbacks: results from an atmosphere-ocean general circulation model  

E-Print Network [OSTI]

Biogeosciences, 6, 2099–2120, 2009 www.biogeosciences.net/6/2099/2009/ © Author(s) 2009. This work is distributed under the Creative Commons Attribution 3.0 License. Biogeosciences Carbon-nitrogen interactions regulate climate-carbon cycle feedbacks.... Inclusion of fundamental ecological interactions between carbon and nitrogen cycles in the land component of an atmosphere-ocean general circulation model (AOGCM) leads to decreased carbon uptake associated with CO2 fertil- ization, and increased carbon...

Thornton, P. E.; Doney, S. C.; Lindsay, Keith; Moore, J. K.; Mahowald, N. M.; Randerson, J. T.; Fung, I.; Lamarque, J. F.; Feddema, Johannes J.

2009-01-01T23:59:59.000Z

30

Solving Problems with GCMs: General Circulation Models and Their Role in the Climate Modeling Hierarchy  

E-Print Network [OSTI]

­Southern Oscillation, from the Devil's Staircase to prediction 16 A. ENSO's regularity and irregularity 16 B. The Devil's Staircase across the modeling hierarchy 18 C. Regularity and prediction 22 IV. Interdecadal oscillations

Robertson, Andrew W.

31

Testing an astronomically-based decadal-scale empirical harmonic climate model versus the IPCC (2007) general circulation climate models  

E-Print Network [OSTI]

We compare the performance of a recently proposed empirical climate model based on astronomical harmonics against all available general circulation climate models (GCM) used by the IPCC (2007) to interpret the 20th century global surface temperature. The proposed model assumes that the climate is resonating with, or synchronized to a set of natural harmonics that have been associated to the solar system planetary motion, mostly determined by Jupiter and Saturn. We show that the GCMs fail to reproduce the major decadal and multidecadal oscillations found in the global surface temperature record from 1850 to 2011. On the contrary, the proposed harmonic model is found to well reconstruct the observed climate oscillations from 1850 to 2011, and it is able to forecast the climate oscillations from 1950 to 2011 using the data covering the period 1850-1950, and vice versa. The 9.1-year cycle is shown to be likely related to a decadal Soli/Lunar tidal oscillation, while the 10-10.5, 20-21 and 60-62 year cycles are sy...

Scafetta, Nicola

2012-01-01T23:59:59.000Z

32

USE OF GENERAL CIRCULATION MODEL OUTPUT IN THE CREATION OF CLIMATE CHANGE SCENARIOS  

E-Print Network [OSTI]

, Sub-Saharan Africa and Venezuela, for use in biological effects models. By combining the general of Energy (MacCracken and Luther, 1985a, b; NRC, 1985; Trabalka, 1985; Strain and Cure, 1985; White, 1985, and possible solar variations, and all agree that surface air temperatures will rise, pre- cipitation patterns

Robock, Alan

33

Impact Assessment of Satellite-Derived Leaf Area Index Datasets Using a General Circulation Model  

E-Print Network [OSTI]

HYUN-SUK KANG Department of Geography, University of California, Los Angeles, Los Angeles, California of California, Los Angeles, Los Angeles, California G. JAMES COLLATZ NASA Goddard Space Flight Center, Greenbelt and composition, ocean circulation, and solar orbit perturbations (Pielke et al. 1998). In most bio- physical land

Xue, Yongkang

34

Changing the Climate Sensitivity of an Atmospheric General Circulation Model through Cloud Radiative Adjustment  

E-Print Network [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 ...

Sokolov, Andrei P.

35

A Study of Longwave Radiation Codes for Climate Studies: Validation with ARM Observations and Tests in General Circulation Models  

SciTech Connect (OSTI)

One specific goal of the Atmospheric Radiation Measurements (ARM) program is to improve the treatment of radiative transfer in General Circulation Models (GCMs) under clear-sky, general overcast and broken cloud conditions. Our project was geared to contribute to this goal by attacking major problems associated with one of the dominant radiation components of the problem --longwave radiation. The primary long-term project objectives were to: (1) develop an optimum longwave radiation model for use in GCMs that has been calibrated with state-of-the-art observations for clear and cloudy conditions, and (2) determine how the longwave radiative forcing with an improved algorithm contributes relatively in a GCM when compared to shortwave radiative forcing, sensible heating, thermal advection and convection. The approach has been to build upon existing models in an iterative, predictive fashion. We focused on comparing calculations from a set of models with operationally observed data for clear, overcast and broken cloud conditions. The differences found through the comparisons and physical insights have been used to develop new models, most of which have been tested with new data. Our initial GCM studies used existing GCMs to study the climate model-radiation sensitivity problem. Although this portion of our initial plans was curtailed midway through the project, we anticipate that the eventual outcome of this approach will provide both a better longwave radiative forcing algorithm and from our better understanding of how longwave radiative forcing influences the model equilibrium climate, how improvements in climate prediction using this algorithm can be achieved.

Robert G. Ellingson

2004-09-28T23:59:59.000Z

36

Aerosol indirect effects ? general circulation model intercomparison and evaluation with satellite data  

E-Print Network [OSTI]

Evaluation of HadGEM2 model, Hadley Centre Technical Noteclimate sensitivity in the Hadley Centre climate model, J.DFG). The Met Office Hadley Centre is funded by the Joint

Quaas, Johannes

2010-01-01T23:59:59.000Z

37

Aerosol indirect effects -- general circulation model intercomparison and evaluation with satellite data  

E-Print Network [OSTI]

Evaluation of HadGEM2 model, Hadley Centre Technical Noteclimate sensitivity in the Hadley Centre climate model, J.ETH Zurich, Switzerland 9 Hadley Centre for Climate Change /

Quaas, Johannes

2010-01-01T23:59:59.000Z

38

Upward Shift of the Atmospheric General Circulation under Global Warming: Theory and Simulations  

E-Print Network [OSTI]

Many features of the general circulation of the atmosphere shift upward in response to warming in simulations of climate change with both general circulation models (GCMs) and cloud-system-resolving models. The importance ...

Singh, Martin Simran

39

Improvement of Moist and Radiative Processes in Highly Parallel Atmospheric General Circulation Models: Validation and Development  

SciTech Connect (OSTI)

Research on designing an integrated moist process parameterization package was carried. This work began with a study that coupled an ensemble of cloud models to a boundary layer model to examine the feasibility of such a methodology for linking boundary layer and cumulus parameterization schemes. The approach proved feasible, prompting research to design and evaluate a coupled parameterization package for GCMS. This research contributed to the development of an Integrated Cumulus Ensemble-Turbulence (ICET) parameterization package. This package incorporates a higher-order turbulence boundary layer that feeds information concerning updraft properties and the variances of temperature and water vapor to the cloud parameterizations. The cumulus ensemble model has been developed, and initial sensitivity tests have been performed in the single column model (SCM) version of CCM2. It is currently being coupled to a convective wake/gust front model. The major function of the convective wake/gust front model is to simulate the partitioning of the boundary layer into disturbed and undisturbed regions. A second function of this model is to predict the nonlinear enhancement of surface to air sensible heat and moisture fluxes that occur in convective regimes due to correlations between winds and anomalously cold, dry air from downdrafts in the gust front region. The third function of the convective wake/gust front model is to predict the amount of undisturbed boundary layer air lifted by the leading edge of the wake and the height to which this air is lifted. The development of the wake/gust front model has been completed, and it has done well in initial testing as a stand-alone component. The current task, to be completed by the end of the funding period, is to tie the wake model to a cumulus ensemble model and to install both components into the single column model version of CCM3 for evaluation. Another area of parametrization research has been focused on the representation of cloud radiative properties. An examination of the CCM2 simulation characteristics indicated that many surface temperature and warm land precipitation problems were linked to deficiencies in the specification of cloud optical properties, which allowed too much shortwave radiation to reach the surface. In-cloud liquid water path was statically specified in the CCM2 using a "prescribed, meridionally and height varying, but time independent, cloud liquid water density profile, which was analytically determined from a meridionally specified liquid water scale height. Single-column model integrations were conducted to explore alternative formulations for the cloud liquid water path diagnostic, converging on an approach that employs a similar, but state-dependent technique for determining in-cloud liquid water concentration. The new formulation, results in significant improvements to both the top-of- atmosphere and surface energy budgets. In particular, when this scheme is incorporated in the three-dimensional GCM, simulated July surface temperature biases are substantially reduced, where summer precipitation over the northern hemisphere continents, as well as precipitation rates over most all warm land areas, is more consistent with observations". This improved parameterization has been incorporated in the CCM3.

Frank, William M.; Hack, James J.; Kiehl, Jeffrey T.

1997-02-24T23:59:59.000Z

40

Cloud/Aerosol Parameterizations: Application and Improvement of General Circulation Models  

SciTech Connect (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

Note: This page contains sample records for the topic "general circulation models" 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.
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41

Block-structured adaptive meshes and reduced grids for atmospheric general circulation models  

Science Journals Connector (OSTI)

...semi-Lagrangian shallow-water model on locally refined...Higgins1990Integration of the shallow water equations on the sphere...parallel adaptive mesh generator for atmospheric and oceanic simulationOcean...series to the shallow-water equations on sphereJ...

2009-01-01T23:59:59.000Z

42

Block-structured adaptive meshes and reduced grids for atmospheric general circulation models  

Science Journals Connector (OSTI)

...grids are widely used for local weather predictions and...Research Forecasting Model WRF (Skamarock et al...small time steps if high wind speeds are present in...m and (c) meridional wind v (m1) at day 10 (McDonald...the advanced research WRF Version 2National Center...

2009-01-01T23:59:59.000Z

43

The response of the width of the Hadley cell to global warming-like thermal forcing in a simple general circulation model.  

E-Print Network [OSTI]

??The response of the Hadley Cell (HC) width to the global warming is investigated using a set of dry global circulation model (GCM) integrations. In… (more)

Lin, Nai Shi

2011-01-01T23:59:59.000Z

44

Wind-Generated Power Input to the Deep Ocean: An Estimate Using a 1/10° General Circulation Model  

Science Journals Connector (OSTI)

Recent studies on the wind-generated power input to the geostrophic and nongeostrophic ocean circulation components have used expressions derived from Ekman dynamics. The present work extends and unifies previous studies by deriving an expression ...

Jin-Song von Storch; Hideharu Sasaki; Jochem Marotzke

2007-03-01T23:59:59.000Z

45

Diagnosing and Picturing the North Atlantic Segment of the Global Conveyor Belt by Means of an Ocean General Circulation Model  

Science Journals Connector (OSTI)

The monthly mean velocity, salinity, and temperature fields of a numerical simulation of the World Ocean climatological circulation are used to study the intensity and pathways associated with the meridional overturning in the North Atlantic. ...

Bruno Blanke; Michel Arhan; Sabrina Speich; Karine Pailler

2002-05-01T23:59:59.000Z

46

A three-layer ocean circulation model application to numerical studies on the North Pacific Ocean circulation  

Science Journals Connector (OSTI)

The formulation and justification of a three-layer baroclinic ocean model developed to simulate the general circulation of the ocean are described in this paper. Test of ... the annual mean circulation patterns i...

Zhang Li-ping; Qin Zeng-hao

1994-09-01T23:59:59.000Z

47

Optimal Surface Salinity Perturbations of the Meridional Overturning and Heat Transport in a Global Ocean General Circulation Model  

E-Print Network [OSTI]

anomaly. This initial optimal perturbation corresponds to a zonal salinity gradient around 24°NOptimal Surface Salinity Perturbations of the Meridional Overturning and Heat Transport in a Global of surface salinity perturbations on the North Atlantic circulation over the past few decades. As a step

Huck, Thierry

48

On testing the significance of atmospheric response to smoke from the Kuwaiti oil fires using the Los Alamos general circulation model  

SciTech Connect (OSTI)

The response of the Los Alamos atmospheric general circulation model to the smoke from the Kuwaiti oil fires set in 1991 is examined. The model has an interactive soot transport module that uses a Lagrangian tracer particle scheme. The statistical significance of the results is evaluated using a methodology based on the classic Student`s t test. Among various estimated smoke emission rates and associated visible absorption coefficients, the worst- and best-case scenarios are selected. In each of the scenarios, an ensemble of 10, 30-day June simulations are conducted with the smoke, and are compared to the same 10 June simulations without the smoke. The results of the worst-case scenario show that a statistically significant wave train pattern propagates eastward-poleward downstream from the source. The signals favorably compare with the observed climate anomalies in summer 1991, albeit some possible El Nino-Southern Oscillation effects were involved in the actual climate. The results of the best-case (i.e., least-impact) scenario show that the significance is rather small but that its general pattern is quite similar to that in the worst-case scenario. 24 refs., 5 figs.

Chih-Yue Jim Kao; Glatzmaier, G.A.; Malone, R.C. [Los Alamos National Lab., NM (United States)

1994-07-20T23:59:59.000Z

49

Use of ARM observations and numerical models to determine radiative and latent heating profiles of mesoscale convective systems for general circulation models  

SciTech Connect (OSTI)

This three-year project, in cooperation with Professor Bob Houze at University of Washington, has been successfully finished as planned. Both ARM (the Atmospheric Radiation Measurement Program) data and cloud-resolving model (CRM) simulations were used to identify the water budgets of clouds observed in two international field campaigns. The research results achieved shed light on several key processes of clouds in climate change (or general circulation models), which are summarized below. 1. Revealed the effect of mineral dust on mesoscale convective systems (MCSs) Two international field campaigns near a desert and a tropical coast provided unique data to drive and evaluate CRM simulations, which are TWP-ICE (the Tropical Warm Pool International Cloud Experiment) and AMMA (the African Monsoon Multidisciplinary Analysis). Studies of the two campaign data were contrasted, revealing that much mineral dust can bring about large MCSs via ice nucleation and clouds. This result was reported as a PI presentation in the 3rd ASR Science Team meeting held in Arlington, Virginia in March 2012. A paper on the studies was published in the Journal of the Atmospheric Sciences (Zeng et al. 2013). 2. Identified the effect of convective downdrafts on ice crystal concentration Using the large-scale forcing data from TWP-ICE, ARM-SGP (the Southern Great Plains) and other field campaigns, Goddard CRM simulations were carried out in comparison with radar and satellite observations. The comparison between model and observations revealed that convective downdrafts could increase ice crystal concentration by up to three or four orders, which is a key to quantitatively represent the indirect effects of ice nuclei, a kind of aerosol, on clouds and radiation in the Tropics. This result was published in the Journal of the Atmospheric Sciences (Zeng et al. 2011) and summarized in the DOE/ASR Research Highlights Summaries (see http://www.arm.gov/science/highlights/RMjY5/view). 3. Used radar observations to evaluate model simulations In cooperation with Profs. Bob Houze at University of Washington and Steven Rutledge at Colorado State University, numerical model results were evaluated with observations from W- and C-band radars and CloudSat/TRMM satellites. These studies exhibited some shortcomings of current numerical models, such as too little of thin anvil clouds, directing the future improvement of cloud microphysics parameterization in CRMs. Two papers of Powell et al (2012) and Zeng et al. (2013), summarizing these studies, were published in the Journal of the Atmospheric Sciences. 4. Analyzed the water budgets of MCSs Using ARM data from TWP-ICE, ARM-SGP and other field campaigns, the Goddard CRM simulations were carried out to analyze the water budgets of clouds from TWP-ICE and AMMA. The simulations generated a set of datasets on clouds and radiation, which are available http://cloud.gsfc.nasa.gov/. The cloud datasets were available for modelers and other researchers aiming to improve the representation of cloud processes in multi-scale modeling frameworks, GCMs and climate models. Special datasets, such as 3D cloud distributions every six minutes for TWP-ICE, were requested and generated for ARM/ASR investigators. Data server records show that 86,206 datasets were downloaded by 120 users between April of 2010 and January of 2012. 5. MMF simulations The Goddard MMF (multi-scale modeling framework) has been improved by coupling with the Goddard Land Information System (LIS) and the Goddard Earth Observing System Model, Version 5 (GOES5). It has also been optimized on NASA HEC supercomputers and can be run over 4000 CPUs. The improved MMF with high horizontal resolution (1 x 1 degree) is currently being applied to cases covering 2005 and 2006. The results show that the spatial distribution pattern of precipitation rate is well simulated by the MMF through comparisons with satellite retrievals from the CMOPRH and GPCP data sets. In addition, the MMF results were compared with three reanalyses (MERRA, ERA-Interim and CFSR). Although the MMF tends

Tao, Wei-Kuo; Houze, Robert, A., Jr.; Zeng, Xiping

2013-03-14T23:59:59.000Z

50

On the Wind Power Input to the Ocean General Circulation  

E-Print Network [OSTI]

The wind power input to the ocean general circulation is usually calculated from the time-averaged wind products. Here, this wind power input is reexamined using available observations, focusing on the role of the synoptically ...

Zhai, Xiaoming

51

Ice shelf-ocean interactions in a general circulation model : melt-rate modulation due to mean flow and tidal currents.  

E-Print Network [OSTI]

??Interactions between the ocean circulation in sub-ice shelf cavities and the overlying ice shelf have received considerable attention in the context of observed changes in… (more)

Dansereau, Veronique

2012-01-01T23:59:59.000Z

52

Ice shelf-ocean interactions in a general circulation model : melt-rate modulation due to mean flow and tidal currents  

E-Print Network [OSTI]

Interactions between the ocean circulation in sub-ice shelf cavities and the overlying ice shelf have received considerable attention in the context of observed changes in flow speeds of marine ice sheets around Antarctica. ...

Dansereau, Véronique

2012-01-01T23:59:59.000Z

53

A Global Climatology of Albedo, Roughness Length and Stomatal Resistance for Atmospheric General Circulation Models as Represented by the Simple Biosphere Model (SiB)  

Science Journals Connector (OSTI)

Components of the Simple Biosphere Model (SiB) of Sellers et al. were used to generate global monthly fields of surface albedo (0.4–4.0 ?m), roughness length and minimum surface (stomatal) resistance.

J. L. Dorman; P. J. Sellers

1989-09-01T23:59:59.000Z

54

Use of ARM observations and numerical models to determine radiative and latent heating profiles of mesoscale convective systems for general circulation models  

SciTech Connect (OSTI)

We examined cloud radar data in monsoon climates, using cloud radars at Darwin in the Australian monsoon, on a ship in the Bay of Bengal in the South Asian monsoon, and at Niamey in the West African monsoon. We followed on with a more in-depth study of the continental MCSs over West Africa. We investigated whether the West African anvil clouds connected with squall line MCSs passing over the Niamey ARM site could be simulated in a numerical model by comparing the observed anvil clouds to anvil structures generated by the Weather Research and Forecasting (WRF) mesoscale model at high resolution using six different ice-phase microphysical schemes. We carried out further simulations with a cloud-resolving model forced by sounding network budgets over the Niamey region and over the northern Australian region. We have devoted some of the effort of this project to examining how well satellite data can determine the global breadth of the anvil cloud measurements obtained at the ARM ground sites. We next considered whether satellite data could be objectively analyzed to so that their large global measurement sets can be systematically related to the ARM measurements. Further differences were detailed between the land and ocean MCS anvil clouds by examining the interior structure of the anvils with the satellite-detected the CloudSat Cloud Profiling Radar (CPR). The satellite survey of anvil clouds in the Indo-Pacific region was continued to determine the role of MCSs in producing the cloud pattern associated with the MJO.

Houze, Jr., Robert A. [University of Washington Dept. of Atmospheric Sciences

2013-11-13T23:59:59.000Z

55

Turbulent convection in the anelastic rotating sphere : a model for the circulation on the giant planets  

E-Print Network [OSTI]

This thesis studies the dynamics of a rotating compressible gas sphere, driven by internal convection, as a model for the dynamics on the giant planets. We develop a new general circulation model for the Jovian atmosphere, ...

Kaspi, Yohai

2008-01-01T23:59:59.000Z

56

Circulation model for water circulation and purification in a water Cerenkov detector  

Science Journals Connector (OSTI)

Owing to its low cost and good transparency, highly purified water is widely used as a medium in large water Cerenkov detector experiments. The water circulation and purification system is usually needed to keep the water in good quality. In this work, a practical circulation model is built to describe the variation of the water resistivity in the circulation process and compared with the data obtained from a prototype experiment. The successful test of the model makes it useful in the future design and optimization of the circulation/purification system.

Lu Hao-Qi; Yang Chang-Gen; Wang Ling-Yu; Xu Ji-Lei; Wang Rui-Guang; Wang Zhi-Min; Wang Yi-Fang

2009-01-01T23:59:59.000Z

57

Power-Law and Long-Memory Characteristics of the Atmospheric General Circulation DMITRY I. VYUSHIN AND PAUL J. KUSHNER  

E-Print Network [OSTI]

Power-Law and Long-Memory Characteristics of the Atmospheric General Circulation DMITRY I. VYUSHIN memory'' or ``power-law'' model. Such a model fits a temporal spectrum to a single power-law function, which thereby accumulates more power at lower frequencies than an AR1 fit. In this study, several power

58

Comparison between Observed and Model Simulated Atmospheric Circulation Patterns Associated with Extreme Temperature Days over North America using CMIP5 Historical Simulations  

Science Journals Connector (OSTI)

Circulation patterns associated with extreme temperature days over North America as simulated by a suite of climate models are compared with those obtained from observations. Seventeen coupled atmosphere-ocean general circulation models ...

Paul C. Loikith; Anthony J. Broccoli

59

Upward Shift of the Atmospheric General Circulation under Global Warming: Theory and Simulations  

E-Print Network [OSTI]

, including upward shifts in the ver- tical velocities and distributions of cloud water and ice as the seaUpward Shift of the Atmospheric General Circulation under Global Warming: Theory and Simulations circulation of the atmosphere shift upward in response to warming in simu- lations of climate change with both

O'Gorman, Paul

60

Posters Comparison Between General Circulation Model Simulation...  

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

triangulation interpolation. For the GCM simulation, the monthly mean surface latent heat flux is sampled at the grid points closest to the buoy sites, then interpolated the...

Note: This page contains sample records for the topic "general circulation models" 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

Relaxing the Boussinesq Approximation in Ocean Circulation Models  

Science Journals Connector (OSTI)

There is a growing need for ocean circulation models that conserve mass rather than volume (as in traditional Boussinesq models). One reason is bottom pressure data expected to flow from satellite-mounted gravity-measuring instruments, and ...

Richard J. Greatbatch; Youyu Lu; Yi Cai

2001-11-01T23:59:59.000Z

62

Potential Vorticity Modeling of the ITCZ and the Hadley Circulation  

Science Journals Connector (OSTI)

A simple zonally symmetric balanced model of the Hadley circulation is presented. The model is based on potential vorticity arguments and consists of a predictive equation for the potential pseudodensity and an invertibility principle to diagnose ...

Wayne H. Schubert; Paul E. Ciesielski; Duane E. Stevens; Hung-Chi Kuo

1991-06-01T23:59:59.000Z

63

1950 B i M d l 1960 General Circulation  

E-Print Network [OSTI]

AFA 2001 TAR 2000 Earth System Models (ESMs) 2014 ARS Climate Research Meteo- rology Climate Change Atmosphere Ocean Models (AOGCMs) 1979 Charney Report 1990 FAR 1995 SAR 2007 AFA 2001 TAR 2000 Earth System Models (ESMs) 2014 ARS Climate Research Meteo- rology Climate Change Science and Policy 1 Cl Re Meteo

Rannacher, Rolf

64

Evaluation of cirrus statistics produced by general circulation...  

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

models for producing climatological cloud statistics by comparing them to the cirrus climatology compiled over the Southern Great Plains (SGP) ARM site. This evaluation includes...

65

Testing Components of New Community Isopycnal Ocean Circulation Model  

SciTech Connect (OSTI)

The ocean and atmosphere are both governed by the same physical laws and models of the two media have many similarities. However, there are critical differences that call for special methods to provide the best simulation. One of the most important difference is that the ocean is nearly opaque to radiation in the visible and infra-red part of the spectrum. For this reason water mass properties in the ocean are conserved along trajectories for long distances and for long periods of time. For this reason isopycnal coordinate models would seem to have a distinct advantage in simulating ocean circulation. In such a model the coordinate surfaces are aligned with the natural paths of near adiabatic, density conserving flow in the main thermocline. The difficulty with this approach is at the upper and lower boundaries of the ocean, which in general do not coincide with density surfaces. For this reason hybrid coordinate models were proposed by Bleck and Boudra (1981) in which Cartesian coordinates were used near the ocean surface and isopycnal coordinates were used in the main thermocline. This feature is now part of the HICOM model (Bleck, 2002).

Bryan, Kirk

2008-05-09T23:59:59.000Z

66

Idealized annually averaged Macroturbulent Hadley 3 Circulation in a Shallow Water Model 4  

E-Print Network [OSTI]

1 1 2 Idealized annually averaged Macroturbulent Hadley 3 Circulation driven Hadley 25 circulation is studied using an idealized shallow water model, is predicted by an effective macroturbulent Hadley circulation 32 Prandtl number, Pr

Harnik, Nili

67

Including Non-Boussinesq Effects in Boussinesq Ocean Circulation Models  

Science Journals Connector (OSTI)

A set of equations is derived to modify z-level Boussinesq ocean circulation models to account for non-Boussinesq effects. These equations take the same form as those of the Boussinesq models except for the addition of a few correction terms that ...

Youyu Lu

2001-06-01T23:59:59.000Z

68

Remarks on an homogeneous model of ocean circulation.  

E-Print Network [OSTI]

Remarks on an homogeneous model of ocean circulation. T. Colin CEA, Centre d'´etudes de Limeil-Valenton, 94195 Villeneuve Saint-Georges Cedex, France. Abstract : We consider a simplified model of ocean relation. This singular limit implies the existence of boundary layers that correspond to currents

Colin, Thierry

69

A Simplified Model of the Modified Hadley Circulation  

Science Journals Connector (OSTI)

A model is developed to find the low-latitude upper-tropospheric atmospheric circulation which would exist in the absence of transient eddies. The forcing in the model is zonally asymmetric to take into account the effect of the distribution of ...

Edwin K. Schneider

1987-11-01T23:59:59.000Z

70

Mercury exosphere I. Global circulation model of its sodium component  

E-Print Network [OSTI]

Mercury exosphere I. Global circulation model of its sodium component Francois Leblanc a,*, R 2010 Accepted 27 April 2010 Available online 5 May 2010 Keywords: Mercury, Atmosphere Aeronomy a b s t r a c t Our understanding of Mercury's sodium exosphere has improved considerably in the last 5

Johnson, Robert E.

71

Initial Testing of a Numerical Ocean Circulation Model Using a Hybrid (Quasi-Isopycnic) Vertical Coordinate  

Science Journals Connector (OSTI)

An ocean circulation model, developed for the study of mesoscale to gyre-scale circulation and heat transport, is described and tested. The model employs density as vertical coordinate except in the immediate vicinity of possible coordinate ...

Rainer Bleck; Douglas B. Boudra

1981-06-01T23:59:59.000Z

72

Seasonal Mean Circulation on the Irish Shelf { A Model-Generated Climatology  

E-Print Network [OSTI]

Seasonal Mean Circulation on the Irish Shelf { A Model-Generated Climatology Daniel R. Lynch and interpret the climatological mean circulation in these waters, with emphasis on the Irish Shelf

73

A Modeling Study of Circulation and Eddies in the Persian Gulf  

Science Journals Connector (OSTI)

The circulation and mesoscale eddies in the Persian Gulf are investigated using results from a high-resolution (?1 km) Hybrid Coordinate Ocean Model (HYCOM). The circulation in the Persian Gulf is composed of two spatial scales: basin scale and ...

Prasad G. Thoppil; Patrick J. Hogan

2010-09-01T23:59:59.000Z

74

RHP: HOW CLIMATE MODELS GAIN AND EXERCISE How Climate Models Gain and Exercise Authority  

E-Print Network [OSTI]

-dimensional models, intermediate complexity models, general circulation models, and Earth system models. 2 www

Hulme, Mike

75

Three-dimensional numerical modeling of thermohaline and wind-driven circulations in the Persian Gulf  

Science Journals Connector (OSTI)

The Persian Gulf circulation is investigated with respect to the relevant forcing mechanism including wind stress and thermohaline surface fluxes by using a three-dimensional numerical hydrodynamic model. The model results show a correlation between the strength of the bottom layer outflow of the Persian Gulf and that of the Indian Ocean Surface Water (IOSW) inflow into the Gulf. The inflow of IOSW into the Gulf attain maximum values in May–June in conjunction with peak bottom outflow through the Hormuz Strait. The results of sensitivity experiment indicate that circulation is dominated by thermohaline flows at almost all parts of the Gulf. The heat fluxes play an essential role on the general circulation of the Persian Gulf. In spring and summer, the wind stress generates southeast-flowing surface currents of magnitude about 5 cm/s along the Saudi Arabia and Iranian coasts on the northern Gulf. In winter and autumn, due to weak static stability, the wind produces mesoscale eddies in most parts of the Gulf. In winter and spring the wind stress acts to reinforce the thermohaline circulation of deep outflow. Conversely, in summer and autumn the wind forcing acts in opposition to the thermohaline forcing and causes a bottom inflow from Oman Sea into the Gulf.

F. Hosseinibalam; S. Hassanzadeh; A. Rezaei-Latifi

2011-01-01T23:59:59.000Z

76

Modeling of a coal-fired natural circulation boiler  

SciTech Connect (OSTI)

Modeling of a natural circulation boiler for a coal-fired thermal power station is presented here. The boiler system is divided into seven subcomponents, and for each section, models based on conservation of mass, momentum, and energy are formulated. The pressure drop at various sections and the heat transfer coefficients are computed using empirical correlations. Solutions are obtained by using SIMULINK. The model is validated by comparing its steady state and dynamic responses with the actual plant data. Open loop responses of the model to the step changes in the operating parameters, such as pressure, temperature, steam flow, feed water flow, are also analyzed. The present model can be used for the development and design of effective boiler control systems.

Bhambare, K.S.; Mitra, S.K.; Gaitonde, U.N. [Indian Institute of Technology, Bombay (India). Dept. of Mechanical Engineering

2007-06-15T23:59:59.000Z

77

Decadal changes in the equatorial Pacific circulation  

E-Print Network [OSTI]

An ocean general circulation model with data assimilation is used to analyze the decadal changes in the tropical Pacific Ocean circulation. Results indicate that the variability in the Equatorial Undercurrent (EUC) and subtropical cells (STC) have...

Urizar, S. Cristina

2002-01-01T23:59:59.000Z

78

Generalized weapon effectiveness modeling .  

E-Print Network [OSTI]

??In this thesis, we compare weapon effectiveness methods to determine if current effectiveness models provide accurate results. The United States Military currently adheres to a… (more)

Anderson, Colin M.

2004-01-01T23:59:59.000Z

79

The response of moist convection and the atmospheric general circulation to climate warming  

E-Print Network [OSTI]

In this thesis, the response of atmospheric circulations to changes in surface temperature is investigated. Both cloud-scale and planetary-scale circulations are considered, and a number of different theoretical and numerical ...

Singh, Martin Simran

2014-01-01T23:59:59.000Z

80

Modeling circulation in lakes: Spatial and temporal variations  

Science Journals Connector (OSTI)

ABSTRACT: The influence of spatial and temporal variations in wind forcing on the circulation in lakes is investigated using field data and the three-dimensional

Note: This page contains sample records for the topic "general circulation models" 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

Generalized spin systems and ? models  

Science Journals Connector (OSTI)

A generalization of the SU(2) spin systems on a lattice and their continuum limit to an arbitrary compact group G is discussed. The continuum limits are, in general, nonrelativistic ?-model-type field theories targeted on a homogeneous space G/H, where H contains the maximal torus of G. In the ferromagnetic case the equations of motion derived from our continuum Lagrangian generalize the Landau-Lifshitz equations with quadratic dispersion relation for small wave vectors. In the antiferromagnetic case the dispersion law is always linear in the long-wavelength limit. The models become relativistic only when G/H is a symmetric space. Also discussed are a generalization of the Holstein-Primakoff representation of the SU(N) algebra, the topological term, and the existence of the instanton-type solutions in the continuum limit of the antiferromagnetic systems.

S. Randjbar-Daemi; Abdus Salam; J. Strathdee

1993-08-01T23:59:59.000Z

82

Seasonal Mean Circulation in the Yellow Sea A ModelGenerated Climatology  

E-Print Network [OSTI]

Seasonal Mean Circulation in the Yellow Sea ­ A Model­Generated Climatology Christopher E. Naimie 1://www­nml.dartmouth.edu/Publications/external publications/PUB­00­1 email: d.r.lynch@dartmouth.edu Abstract The three­dimensional climatological circulation

83

Hadley Circulation Response to Orbital Precession. Part I: Aquaplanets  

Science Journals Connector (OSTI)

The response of the monsoonal and annual-mean Hadley circulation to orbital precession is examined in an idealized atmospheric general circulation model with an aquaplanet slab-ocean lower boundary. Contrary to expectations, the simulated ...

Timothy M. Merlis; Tapio Schneider; Simona Bordoni; Ian Eisenman

2013-02-01T23:59:59.000Z

84

Hadley Circulation Response to Orbital Precession. Part II: Subtropical Continent  

Science Journals Connector (OSTI)

The response of the monsoonal and annual-mean Hadley circulation to orbital precession is examined in an idealized atmospheric general circulation model with a simplified representation of land surface processes in subtropical latitudes. When ...

Timothy M. Merlis; Tapio Schneider; Simona Bordoni; Ian Eisenman

2013-02-01T23:59:59.000Z

85

A New Lagrangian Coastal Circulation Model J.M. Greenberg  

E-Print Network [OSTI]

circulation in the open ocean. In deep seas, currents are largely predictable. The different seasons' prevailing currents have been charted since the days of the earliest oceanic explorers. However, currents. To mankind, the most important areas of the ocean are those closest to us. The littoral regions of the world

86

Thermodynamics of the General Diffusion Process: Equilibrium Supercurrent and Nonequilibrium Driven Circulation with Dissipation  

E-Print Network [OSTI]

Unbalanced probability circulation, which yields cyclic motions in phase space, is the defining characteristics of a stationary diffusion process without detailed balance. In over-damped soft matter systems, such behavior is a hallmark of the presence of a sustained external driving force accompanied with dissipations. In an under-damped and strongly correlated system, however, cyclic motions are often the consequences of a conservative dynamics. In the present paper, we give a novel interpretation of a class of diffusion processes with stationary circulation in terms of a Maxwell-Boltzmann equilibrium in which cyclic motions are on the level set of stationary probability density function thus non-dissipative, e.g., a supercurrent. This implies an orthogonality between stationary circulation $J^{ss}(x)$ and the gradient of stationary probability density $f^{ss}(x)>0$. A sufficient and necessary condition for the orthogonality is a decomposition of the drift $b(x)=j(x)+ D(x)\

Hong Qian

2014-12-18T23:59:59.000Z

87

The Influence of Hadley Circulation Intensity Changes on Extratropical Climate in an Idealized Model  

Science Journals Connector (OSTI)

Experiments have been performed using a simple global model with idealized physics and zonally symmertrical forcings to investigate the influence of Hadley circulation intensity changes on extratropical climate. The heating within the Tropics is ...

Edmund K. M. Chang

1995-06-01T23:59:59.000Z

88

Integration of Different Wave Forcing Formulations with Nearshore Circulation Models  

E-Print Network [OSTI]

that the formation of equilibrium scour/deposition profile on the offshore side of the structure is mainly due to the formation of partial or full standing waves. Silvester and Hsu (1997) concluded that the deposition occurs underneath the antinodes of wave.... In most of their applications, either the effect of reflection on the induced circulation was not substantial or the results were not presented in the areas of strong reflection, for example, on the offshore side of the detached breakwater. Also...

Sharma, Abhishek

2012-02-14T23:59:59.000Z

89

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 Tool Summary LAUNCH TOOL Name: Computable General...

90

Modeling bronchial circulation with application to soluble gas exchange: description and sensitivity analysis  

E-Print Network [OSTI]

Modeling bronchial circulation with application to soluble gas exchange: description into an existing model that describes the simul- taneous exchange of heat, water, and a soluble gas in the airways and represents an avenue to understanding the ex- change process. The soluble gas used in the model simulations

George, Steven C.

91

E-Print Network 3.0 - atmospheric circulation trends Sample Search...  

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

of the atmospheric circulation. This hypothesis was supported by simulation of the ECHO-G model Lorenz and Lohmann... , 2004. ECHO-G is a general circulation model that in...

92

The lattice Boltzmann method as a basis for ocean circulation modeling  

E-Print Network [OSTI]

The lattice Boltzmann method as a basis for ocean circulation modeling by Rick Salmon1 ABSTRACT We construct a lattice Boltzmann model of a single-layer, ``reduced gravity'' ocean in a square basin Boltzmann solutions of the planetary geostrophic equations do not require a lattice with the high degree

Salmon, Rick

93

Circulation Sensitivity to Heating in a Simple Model of Baroclinic Turbulence PABLO ZURITA-GOTOR  

E-Print Network [OSTI]

Circulation Sensitivity to Heating in a Simple Model of Baroclinic Turbulence PABLO ZURITA-level model on the form and strength of the heating, aiming to understand the qualitatively different sensitivity of the isentropic slope on differential heating reported by previous idealized studies when

Vallis, Geoff

94

Multiple Equilibria of the Hadley Circulation in an Intermediate-Complexity Axisymmetric Model  

Science Journals Connector (OSTI)

A model of intermediate complexity based on quasi-equilibrium theory—a version of the Quasi-Equilibrium Tropical Circulation Model with a prognostic atmospheric boundary layer, as well as two free-tropospheric modes in momentum, and one each in ...

Gilles Bellon; Adam H. Sobel

2010-04-01T23:59:59.000Z

95

COBRA-WC model and predictions for a fast-reactor natural-circulation transient. [LMFBR  

SciTech Connect (OSTI)

The COBRA-WC (Whole Core) code has been used to predict the core-wide coolant and rod temperature distribution in a liquid metal fast reactor during the early part (first 220 seconds) of a natural circulation transient. Approximately one-sixth of the core was modeled including bypass flows and the pressure losses above and below the core region. Detailed temperature and flow distributions were obtained for the two test fuel assemblies. The COBRA-WC model, the approach, and predictions of core-wide transient coolant and rod temperatures during a natural circulation transient are presented in this paper.

George, T.L.; Basehore, K.L.; Prather, W.A.

1980-01-01T23:59:59.000Z

96

The influence of Hadley circulation intensity changes on extratropical climate in an idealized model  

SciTech Connect (OSTI)

Experiments have been performed using a simple global model with idealized physics and zonally symmetrical forcings to investigate the influence of Hadley circulation intensity changes on extratropical climate. The heating within the Tropics is latitudinally concentrated, while the heating in the extratropics is kept unchanged. This leads to an increase in the intensity of the Hadley circulation. As found earlier by Hou, along with the increase in the intensity of the Hadley circulation, there is a statistically significant temperature increase in the winter high latitudes. Zonal-mean diagnostics have been performed in order to identify the link between the changes in the Tropics and the extratropics. Detailed diagnostics of the heat budget shows that warming in the winter high latitudes is induced by changes in the mean meridional circulation, over the opposing cooling effects caused by changes in the eddy heat fluxes. Such a change is consistent with an equatorward shift of the jet stream and its associated heating pattern. It is suggested that the equatorward shift in jet position is caused by an increase in westerly acceleration within the Tropics associated with the enhancement in the intensity of the Hadley circulation. Limitations of the model are also discussed. 28 refs., 16 figs.

Chang, E.K.M. [Massachusetts Institute of Technology, Cambridge, MA (United States)] [Massachusetts Institute of Technology, Cambridge, MA (United States)

1995-06-01T23:59:59.000Z

97

Evaluating carbon sequestration efficiency in an ocean circulation model by adjoint sensitivity analysis  

E-Print Network [OSTI]

Evaluating carbon sequestration efficiency in an ocean circulation model by adjoint sensitivity the application of the adjoint method to develop three-dimensional maps of carbon sequestration efficiency. Sequestration efficiency (the percentage of carbon injected at a continuous point source that remains

Follows, Mick

98

Development of the Great Lakes Ice-circulation Model (GLIM): Application to Lake Erie in 20032004  

E-Print Network [OSTI]

due to strong cooling and wind mixing. Prediction of the lake's ice extent (i.e., ice coverDevelopment of the Great Lakes Ice-circulation Model (GLIM): Application to Lake Erie in 2003: Received 4 May 2009 Accepted 30 November 2009 Communicated by Dr. Ram Yerubandi Index words: Coupled Ice

99

Modeling wind-driven circulation during the March 1998 sediment resuspension event in Lake Michigan  

E-Print Network [OSTI]

Modeling wind-driven circulation during the March 1998 sediment resuspension event in Lake Michigan Michigan to simulate hydrodynamic conditions during the March 1998 sediment resuspension event in southern resuspension Citation: Beletsky, D., D. J. Schwab, P. J. Roebber, M. J. McCormick, G. S. Miller, and J. H

100

Modelled and observed variability of the atmospheric circulation the Peruvian Current System: 2000-2005  

E-Print Network [OSTI]

on the characteristics of the local equatorward atmospheric circulation. Resolving the mesoscale variability of the heat Mesoscale Model (MM5) and Weather Research and Forecasting (WRF) that were run over the Peruvian Current System (PCS) [0N-19°S; 83°W-68°W] from November 2000- October 2005. Wind data as derived from

Note: This page contains sample records for the topic "general circulation models" 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

Model-free adaptive control of supercritical circulating fluidized-bed boilers  

DOE Patents [OSTI]

A novel 3-Input-3-Output (3.times.3) Fuel-Air Ratio Model-Free Adaptive (MFA) controller is introduced, which can effectively control key process variables including Bed Temperature, Excess O2, and Furnace Negative Pressure of combustion processes of advanced boilers. A novel 7-input-7-output (7.times.7) MFA control system is also described for controlling a combined 3-Input-3-Output (3.times.3) process of Boiler-Turbine-Generator (BTG) units and a 5.times.5 CFB combustion process of advanced boilers. Those boilers include Circulating Fluidized-Bed (CFB) Boilers and Once-Through Supercritical Circulating Fluidized-Bed (OTSC CFB) Boilers.

Cheng, George Shu-Xing; Mulkey, Steven L

2014-12-16T23:59:59.000Z

102

History of Vascular Modelling William Harvey discovery of the circulation  

E-Print Network [OSTI]

. (1628) #12;History of Vascular Modelling Stephen Hales 1677 ­ 1761 · blood pressure measurements · flow capillary blood volume 150 ml Blood-Gas exchange area 70 m2 Average capillary radius 4 µm #12;Systemic

Luo, Xiaoyu

103

The temporal cascade structure of reanalyses and Global Circulation models  

E-Print Network [OSTI]

and stochastic forecasting. 1. Introduction "Weather prediction by Numerical Process" (Richardson, 1922 equations. While these equations are deterministic, numerical weather prediction has been increasingly of the deterministic models. Interestingly, Richardson is not only the father of numerical weather forecasting, he

Lovejoy, Shaun

104

February 2002 Modelling The Conveyor Belt Circulation using MICOM  

E-Print Network [OSTI]

thknss. consistent with cooling #12;Large heat loss in Antarctic winter ameliorated (Too much?) #12;Grid Project · Oceans transport about half the heat from Tropics to Polar Regions · Wind Driven ocean/Xie-Arkin: Precipitation · Model SST + Bulk Forcing (Large et al.) Surface Flux of Heat and Freshwater #12;· NO RESTORING

Nadiga, Balasubramanya T. "Balu"

105

Tidal turbine representation in an ocean circulation model: Towards realistic applications  

Science Journals Connector (OSTI)

Abstract The present method proposes the use and adaptation of ocean circulation models as an assessment tool framework for tidal current turbine (TCT) array-layout optimization. By adapting both momentum and turbulence transport equations of an existing model, the present TCT representation method is proposed to extend the actuator disc concept to 3-D large scale ocean circulation models. Through the reproduction of experimental flume tests, this method has shown its ability to simulate accurately both momentum and turbulent wake interactions. In addition, through an up-scaling test, this method has shown to be applicable at any scale. Thanks to its short computational time, the present TCT representation method is a very promising basis for the development of a TCT array layout optimization tool. Furthermore, on the basis of the simulations performed for the present publication, a reflection on the quantification of the array layout effects on power assessment and device deployment strategy has been initiated.

Thomas Roc; Deborah Greaves; Kristen M. Thyng; Daniel C. Conley

2014-01-01T23:59:59.000Z

106

Study of natural circulation in a VHTR after a LOFA using different turbulence models  

SciTech Connect (OSTI)

Natural convection currents in the core are anticipated in the event of the failure of the gas circulator in a prismatic gas-cooled very high temperature reactor (VHTR). The paths that the helium coolant takes in forming natural circulation loops and the effective heat transport are of interest. The heated flow in the reactor core is turbulent during normal operating conditions and at the beginning of the LOFA with forced convection, but the flow may significantly be slowed down after the event and laminarized with mixed convection. In the present study, the potential occurrence and effective heat transport of natural circulation are demonstrated using computational fluid dynamic (CFD) calculations with different turbulence models as well as laminar flow. Validations and recommendation on turbulence model selection are conducted. The study concludes that large loop natural convection is formed due to the enhanced turbulence levels by the buoyancy effect and the turbulent regime near the interface of upper plenum and flow channels increases the flow resistance for channel flows entering upper plenum and thus less heat can be removed from the core than the prediction by laminar flow assumption.

Yu-Hsin Tung; Yuh-Ming Ferng; Richard W. Johnson; Ching-Chang Chieng

2013-10-01T23:59:59.000Z

107

Coastal Atmospheric Circulation around an Idealized Cape during Wind-Driven Upwelling Studied from a Coupled Ocean–Atmosphere Model  

Science Journals Connector (OSTI)

The study analyzes atmospheric circulation around an idealized coastal cape during summertime upwelling-favorable wind conditions simulated by a mesoscale coupled ocean–atmosphere model. The domain resembles an eastern ocean boundary with a ...

Natalie Perlin; Eric D. Skyllingstad; Roger M. Samelson

2011-03-01T23:59:59.000Z

108

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

109

Dynamics and Energy Balance of the Hadley Circulation and the Tropical Precipitation Zones: Significance of the Distribution of Evaporation  

Science Journals Connector (OSTI)

A series of numerical experiments is performed using a general circulation model with an idealistic ocean-covered boundary condition. The meridional structure of the Hadley circulation system, which is a combined structure of the Hadley ...

Atusi Numaguti

1993-07-01T23:59:59.000Z

110

Impact of the Southern ocean winds on sea-ice - ocean interaction and its associated global ocean circulation in a warming world  

E-Print Network [OSTI]

This dissertation discusses a linkage between the Southern Ocean (SO) winds and the global ocean circulation in the framework of a coarse-resolution global ocean general circulation model coupled to a sea-ice model. In addition to reexamination...

Cheon, Woo Geunn

2009-05-15T23:59:59.000Z

111

An innovative bed temperature-oriented modeling and robust control of a circulating fluidized bed combustor  

Science Journals Connector (OSTI)

Circulating fluidized bed (CFB) combustion systems are increasingly used as superior coal burning systems in power generation due to their higher efficiency and lower emissions. However, because of their non-linearity and complex behavior, it is difficult to build a comprehensive model that incorporates all the system dynamics. In this paper, a mathematical model of the circulating fluidized bed combustion system based on mass and energy conservation equations was successfully extracted. Using these correlations, a state space dynamical model oriented to bed temperature has been obtained based on subspace method. Bed temperature, which influences boiler overall efficiency and the rate of pollutants emission, is one of the most significant parameters in the operation of these types of systems. Having dynamic and parametric uncertainties in the model, a robust control algorithm based on linear matrix inequalities (LMI) have been applied to control the bed temperature by input parameters, i.e. coal feed rate and fluidization velocity. The controller proposed properly sets the temperature to our desired range with a minimum tracking error and minimizes the sensitivity of the closed-loop system to disturbances caused by uncertainties such as change in feeding coal, while the settling time of the system is significantly decreased.

Aboozar Hadavand; Ali Akbar Jalali; Parviz Famouri

2008-01-01T23:59:59.000Z

112

A Transient Model of Induced Natural Circulation Thermal Cycling for Hydrogen Isotope Separation  

SciTech Connect (OSTI)

The property of selective temperature dependence of adsorption and desorption of hydrogen isotopes by palladium is used for isotope separation. A proposal to use natural circulation of nitrogen to alternately heat and cool a packed bed of palladium coated beads is under active investigation, and a device consisting of two interlocking natural convection loops is being designed. A transient numerical model of the device has been developed to aid the design process. It is a one-dimensional finite-difference model, using the Boussinesq approximation. The thermal inertia of the pipe walls and other heat structures as well as the heater control logic is included in the model. Two system configurations were modeled and results are compared.

SHADDAY, MARTIN

2005-07-12T23:59:59.000Z

113

Modelling anisotropic fluid spheres in general relativity  

E-Print Network [OSTI]

We argue that an arbitrary general relativistic anisotropic fluid sphere, (spherically symmetric but with transverse pressure not equal to radial pressure), can nevertheless be successfully modelled by suitable linear combinations of quite ordinary classical matter: an isotropic perfect fluid, a classical electromagnetic field, and a classical (minimally coupled) scalar field. While the most general decomposition is not unique, a preferred minimal decomposition can be constructed that is unique. We show how the classical energy conditions for the anisotropic fluid sphere can be related to energy conditions for the isotropic perfect fluid, electromagnetic field, and scalar field components of the model. Furthermore we show how this decomposition relates to the distribution of electric charge density and scalar charge density throughout the model that is used to mimic the anisotropic fluid sphere. Consequently, we can build physically reasonable matter models for almost any spherically symmetric spacetime.

Boonserm, Petarpa; Visser, Matt

2015-01-01T23:59:59.000Z

114

Three-dimensional Atmospheric Circulation Models of HD 189733b and HD 209458b with Consistent Magnetic Drag and Ohmic Dissipation  

Science Journals Connector (OSTI)

We present the first three-dimensional circulation models for extrasolar gas giant atmospheres with geometrically and energetically consistent treatments of magnetic drag and ohmic dissipation. Atmospheric resistivities are continuously updated and calculated directly from the flow structure, strongly coupling the magnetic effects with the circulation pattern. We model the hot Jupiters HD 189733b (T eq ? 1200 K) and HD 209458b (T eq ? 1500 K) and test planetary magnetic field strengths from 0 to 30 G. We find that even at B = 3 G the atmospheric structure and circulation of HD 209458b are strongly influenced by magnetic effects, while the cooler HD 189733b remains largely unaffected, even in the case of B = 30 G and super-solar metallicities. Our models of HD 209458b indicate that magnetic effects can substantially slow down atmospheric winds, change circulation and temperature patterns, and alter observable properties. These models establish that longitudinal and latitudinal hot spot offsets, day-night flux contrasts, and planetary radius inflation are interrelated diagnostics of the magnetic induction process occurring in the atmospheres of hot Jupiters and other similarly forced exoplanets. Most of the ohmic heating occurs high in the atmosphere and on the dayside of the planet, while the heating at depth is strongly dependent on the internal heat flux assumed for the planet, with more heating when the deep atmosphere is hot. We compare the ohmic power at depth in our models, and estimates of the ohmic dissipation in the bulk interior (from general scaling laws), to evolutionary models that constrain the amount of heating necessary to explain the inflated radius of HD 209458b. Our results suggest that deep ohmic heating can successfully inflate the radius of HD 209458b for planetary magnetic field strengths of B ? 3-10 G.

Emily Rauscher; Kristen Menou

2013-01-01T23:59:59.000Z

115

Mathematical circulation model for the blood-flow-heat-loss relationship in the rat tail  

Science Journals Connector (OSTI)

A mathematical model for the heat-loss-blood-flow relationship is developed for the rat tail. When supplied with experimental values of heat loss and blood flow, the model allows one to compute the distribution of flow in deep and cutaneous vessels as a function of body core and tail temperature and to determine the savings in heat loss that result from alterations in the pattern of circulation and from counter-current heat transfer. Blood flow in the cutaneous and deep lying veins of the tail is controlled by both central and local temperatures and increases fairly linearly with deep body temperature. However, the distribution of blood flow in the tail is controlled only by local tail temperature and is independent of deep body temperature. The change in venous distribution of flow has a great impact on the conservation of heat and can reduce the heat loss from the circulating blood by more than 50% when venous return is directed to deep lying veins. On the other hand, counter-current heat transfer is of only minor importance in the control of heat loss from the tail, resulting at most in a 10% saving of heat loss, and that only at the smallest rate of blood flow.

E R Raman; V J Vanhuyse; M F Roberts

1987-01-01T23:59:59.000Z

116

Ocean Circulation During the Last Glacial Maximum Simulated by PMIP3 Climate Models  

E-Print Network [OSTI]

in the intensity of the Atlantic Overturning Circulation (distinguished by the local maximum at approximately 30 N %. In the plot corresponding to the World Ocean Circulation, an increase in the Deep Circulation, associated of the water masses as well as the impact on ocean carbon storage. References: [1] Godfrey J. S., Geophysics

Schmittner, Andreas

117

A generalized interval probability-based optimization method for training generalized hidden Markov model  

Science Journals Connector (OSTI)

Recently a generalized hidden Markov model (GHMM) was proposed for solving the information fusion problems under aleatory and epistemic uncertainties in engineering application. In GHMM, aleatory uncertainty is captured by the probability measure whereas ... Keywords: Generalized Baum-Welch algorithm, Generalized Jensen inequality, Generalized hidden Markov model, Generalized interval probability, State recognition

Fengyun Xie; Bo Wu; Youmin Hu; Yan Wang; Guangfei Jia; Yao Cheng

2014-01-01T23:59:59.000Z

118

Generalized parafermionic theory and integrable lattice models  

Science Journals Connector (OSTI)

We show that the criticality of integrable lattice models based on the Lie algebras An,Dn,En can be understood as the product of certain numbers of bosonic fields and a generalized parafermionic (fractional spin) theory (GPT). We compute the central charge of the GPT using the thermodynamic Bethe-ansatz approach. For the model associated with the A2 Lie algebra, we propose that the associated GPT can be described by a composition of Ising and tricritical-Ising conformal field theories.

Márcio José Martins

1990-10-22T23:59:59.000Z

119

A stabilized proper orthogonal decomposition reduced-order model for large scale quasigeostrophic ocean circulation  

E-Print Network [OSTI]

In this paper, a stabilized proper orthogonal decomposition (POD) reduced-order model (ROM) is presented for the barotropic vorticity equation. We apply the POD-ROM model to mid-latitude simplified oceanic basins, which are standard prototypes of more realistic large-scale ocean dynamics. A mode dependent eddy viscosity closure scheme is used to model the effects of the discarded POD modes. A sensitivity analysis with respect to the free eddy viscosity stabilization parameter is performed for various POD-ROMs with different numbers of POD modes. The POD-ROM results are validated against the Munk layer resolving direct numerical simulations using a fully conservative fourth-order Arakawa scheme. A comparison with the standard Galerkin POD-ROM without any stabilization is also included in our investigation. Significant improvements in the accuracy over the standard Galerkin model are shown for a four-gyre ocean circulation problem. This first step in the numerical assessment of the POD-ROM shows that it could r...

San, Omer

2014-01-01T23:59:59.000Z

120

Central South Pacific thermocline water circulation from a high-resolution ocean model validated against satellite data  

E-Print Network [OSTI]

with satellite data. We focus on the upper 500 m, where ocean current variability has been barely documented due processes. [3] Neither ocean currents nor ocean temperature vari- ability are well described becauseCentral South Pacific thermocline water circulation from a high-resolution ocean model validated

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "general circulation models" 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

Modeling Wind-Driven Circulation and Landfast Ice-Edge Processes during Polynya Events in Northern Baffin Bay  

E-Print Network [OSTI]

attached to the ice edge that is generated during strong northerly wind events. Primary production heat polynyas. In the former case, sea ice is continuously advected by winds and/or currents away fromModeling Wind-Driven Circulation and Landfast Ice-Edge Processes during Polynya Events in Northern

122

Strong antibunching in a generalized Rabi model  

E-Print Network [OSTI]

We consider a generalized version of the Rabi model that includes a nonlinear, dispersive-type atom-field interaction in addition to the usual linear dipole coupling, as well as cavity dissipation. An effective system of this sort arises, for example, in a quantum simulation of the Rabi model based upon Raman transitions in an optical cavity QED setting [A. L. Grimsmo and S. Parkins, Phys. Rev. A {\\bf87}, 033814 (2013)]. For a suitable choice of the nonlinear interaction strength, near degeneracies of the states in the cavity-mode vacuum and single-photon subspaces, in combination with cavity loss, gives rise to an essentially closed cycle of excitations and photon emissions within these subspaces. Consequently, the cavity output field is strongly antibunched. We develop a quantum-trajectory-based description of the system that models its key properties very well, and use a simple dressed-state picture to explain the novel structure of the cavity fluorescence spectrum. We also present numerical results for a potential realization of the system using a rubidium atom coupled strongly to a high-finesse optical cavity mode.

Arne L. Grimsmo; Scott Parkins

2013-11-24T23:59:59.000Z

123

New model for nucleon generalized parton distributions  

SciTech Connect (OSTI)

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{sub +}{sup 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, Newport News, VA (United States)

2014-01-01T23:59:59.000Z

124

Hydrodynamic modeling of poly-solid reactive circulating fluidized beds: Application to Chemical Looping Combustion.  

E-Print Network [OSTI]

??Une étude précise des écoulements gaz-particules poly-solides et réactifs rencontrés dans les lits fluidisés circulants (LFC) appliqués au procédé de Chemical Looping Combustion (CLC) est… (more)

Nouyrigat, Nicolas

2012-01-01T23:59:59.000Z

125

Hydrodynamic modeling of poly-solid reactive circulating fluidized beds : Application to Chemical Looping Combustion.  

E-Print Network [OSTI]

??Une étude précise des écoulements gaz-particules poly-solides et réactifs rencontrés dans les lits fluidisés circulants (LFC) appliqués au procédé de Chemical Looping Combustion (CLC) est… (more)

Nouyrigat, Nicolas

2012-01-01T23:59:59.000Z

126

Atlantic Ocean circulation at the last glacial maximum : inferences from data and models  

E-Print Network [OSTI]

This thesis focuses on ocean circulation and atmospheric forcing in the Atlantic Ocean at the Last Glacial Maximum (LGM, 18-21 thousand years before present). Relative to the pre-industrial climate, LGM atmospheric CO? ...

Dail, Holly Janine

2012-01-01T23:59:59.000Z

127

A Simple Model of Nonlinear Hadley Circulation with an ITCZ: Analytic and Numerical Solutions  

Science Journals Connector (OSTI)

Simple analytic solutions are constructed for an axially symmetric, nonlinear, slightly viscous circulation in a Boussinesq atmosphere in the presence of intense convection at an intertropical convergence zone. The latitude–height extent of the ...

Ming Fang; Ka Kit Tung

1996-05-01T23:59:59.000Z

128

General single phase wellbore flow model  

SciTech Connect (OSTI)

A general wellbore flow model, which incorporates not only frictional, accelerational and gravitational pressure drops, but also the pressure drop caused by inflow, is presented in this report. The new wellbore model is readily applicable to any wellbore perforation patterns and well completions, and can be easily incorporated in reservoir simulators or analytical reservoir inflow models. Three dimensionless numbers, the accelerational to frictional pressure gradient ratio R{sub af}, the gravitational to frictional pressure gradient ratio R{sub gf}, and the inflow-directional to accelerational pressure gradient ratio R{sub da}, have been introduced to quantitatively describe the relative importance of different pressure gradient components. For fluid flow in a production well, it is expected that there may exist up to three different regions of the wellbore: the laminar flow region, the partially-developed turbulent flow region, and the fully-developed turbulent flow region. The laminar flow region is located near the well toe, the partially-turbulent flow region lies in the middle of the wellbore, while the fully-developed turbulent flow region is at the downstream end or the heel of the wellbore. Length of each region depends on fluid properties, wellbore geometry and flow rate. As the distance from the well toe increases, flow rate in the wellbore increases and the ratios R{sub af} and R{sub da} decrease. Consequently accelerational and inflow-directional pressure drops have the greatest impact in the toe region of the wellbore. Near the well heel the local wellbore flow rate becomes large and close to the total well production rate, here R{sub af} and R{sub da} are small, therefore, both the accelerational and inflow-directional pressure drops can be neglected.

Ouyang, Liang-Biao; Arbabi, S.; Aziz, K.

1997-02-05T23:59:59.000Z

129

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

130

Interacting holographic generalized Chaplygin gas model  

E-Print Network [OSTI]

In this paper we consider a correspondence between the holographic dark energy density and interacting generalized Chaplygin gas energy density in FRW universe. Then we reconstruct the potential of the scalar field which describe the generalized Chaplygin cosmology.

M. R. Setare

2007-08-01T23:59:59.000Z

131

Mechanisms for Tropical Tropospheric Circulation Change in Response to Global Warming*  

E-Print Network [OSTI]

Mechanisms for Tropical Tropospheric Circulation Change in Response to Global Warming* JIAN MA change in global warming is studied by comparing the response of an atmospheric general circulation model globally in response to SST warming. A diagnostic framework is developed based on a linear baroclinic model

Xie, Shang-Ping

132

Interactions between the Indonesian Throughflow and circulations in the Indian and Pacific Oceans  

E-Print Network [OSTI]

Interactions between the Indonesian Throughflow and circulations in the Indian and Pacific Oceans with the Indonesian Throughflow (IT), particularly concerning subsurface currents in the Pacific Ocean, are studied model (LOM), both confined to the Indo-Pacific basin; and a global, ocean general circulation model

Jensen, Tommy

133

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...

Wurbs, Ralph A.

134

Sensitivities of zonal mean atmospheric circulation to SST warming in an aquaplanet model  

E-Print Network [OSTI]

warming, the Hadley cell is intensified in the deep tropics, yet the Hadley cell boundary contracts, storm tracks, or the boundaries of Hadley cell circulations under global warming [e.g., Yin, 2005]. In the troposphere, however, the atmosphere displays nearly opposite changes in the Hadley cell width

Chen, Gang

135

Use of a 3D liver microreactor as an in vitro model for the study of bile acid synthesis and hepatobiliary circulation  

E-Print Network [OSTI]

The liver regulates a myriad of vital functions including bile acid synthesis, hepatobiliary circulation, cholesterol homeostasis, drug metabolism, etc. This thesis focuses on the use of a 3D in vitro model of liver to ...

Llamas Vidales, Jose Ricardo

2009-01-01T23:59:59.000Z

136

Effect of Atlantic Meridional Overturning Circulation Changes on Tropical Atlantic Sea Surface Temperature Variability: A 2½-Layer Reduced-Gravity Ocean Model Study  

Science Journals Connector (OSTI)

Previous coupled climate model simulations reveal that a dipole-like SST pattern with cooler (warmer) temperature over the north (south) tropical Atlantic emerges in response to a slowdown of the Atlantic meridional overturning circulation (AMOC)...

Caihong Wen; Ping Chang; Ramalingam Saravanan

2010-01-01T23:59:59.000Z

137

The Effect of a Hadley Circulation on the Propagation and Reflection of Planetary Waves in a Simple One-Layer Model  

Science Journals Connector (OSTI)

The effect of a simple representation of the Hadley circulation on the propagation and nonlinear reflection of planetary-scale Rossby waves in the winter hemisphere is investigated numerically in a single-layer shallow-water model.

J. Gavin Esler; Lorenzo M. Polvani; R. Alan Plumb

2000-05-01T23:59:59.000Z

138

Stommel’s Box Model of Thermohaline Circulation Revisited—The Role of Mechanical Energy Supporting Mixing and the Wind-Driven Gyration  

Science Journals Connector (OSTI)

The classical two-box model of Stommel is extended in two directions: replacing the buoyancy constraint with an energy constraint and including the wind-driven gyre. Stommel postulated a buoyancy constraint for the thermohaline circulation, and ...

Yu Ping Guan; Rui Xin Huang

2008-04-01T23:59:59.000Z

139

HOMOGENEOUS MODELS IN GENERAL RELATIVITY AND GAS DYNAMICS  

E-Print Network [OSTI]

HOMOGENEOUS MODELS IN GENERAL RELATIVITY AND GAS DYNAMICS O. I. BOGOYAVLENSKII AND S. P. NOVIKOV analytically) in general relativity and gas dynamics. The investigation of these models is carried out begins with a short survey of results on non-trivial models (that is, those that are not integrable

Novikov, Sergei Petrovich

140

A Generalized Pyrolysis Model for Combustible Solids  

E-Print Network [OSTI]

processes such as flash pyrolysis [187], but it has not yetreaction model for flash wood pyrolysis,” Fuel 68: 1408–

Lautenberger, Chris

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "general circulation models" 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

A General Process Model of Sustainability  

Science Journals Connector (OSTI)

The intellectual roots of sustainability and some of its theoretical consequences for sustainable development have been reviewed, and need not be here. ... Just as material processes are governed by the first and second laws of thermodynamics and the theory of rate processes, the general theory of sustainability is based on these three concepts as applied to dynamic as well as steady-state processes. ... Basing the theory on the twin pillars of thermodynamics and rate processes enables it to be generalized across physical-metabolic and social-economic phenomena. ...

Michael Neuman; Stuart W. Churchill

2011-01-18T23:59:59.000Z

142

Precipitation response to land subsurface hydrologic processes in atmospheric general circulation model simulations  

E-Print Network [OSTI]

doi:10.1029/2001JD000392. Hack, J. J. , J. M. Caron, S. G.by several studies [e.g. , Hack et al. , 2006; Wang et al. ,

Lo, Min-Hui; Famiglietti, James S

2011-01-01T23:59:59.000Z

143

Lakes in General Circulation Models Primary Investigator: Brent Lofgren -NOAA GLERL  

E-Print Network [OSTI]

-Investigators: Chris Milly, Isaac Held, Bruce Wyman - NOAA Geophysical Fluid Dynamics Laboratory Overview The use

144

Aerosol indirect effects ? general circulation model intercomparison and evaluation with satellite data  

E-Print Network [OSTI]

Supercomputing through a grant of computer time. The GFDLand NASA grant NNX08AL83G and acknowledge computer time

Quaas, Johannes

2010-01-01T23:59:59.000Z

145

Aerosol indirect effects -- general circulation model intercomparison and evaluation with satellite data  

E-Print Network [OSTI]

Supercomputing through a grant of computer time. The GFDLand NASA grant NNX08AL83G and acknowledge computer time

Quaas, Johannes

2010-01-01T23:59:59.000Z

146

Flying the TRMM Satellite in a general circulation model Laura D. Fowler, and David A. Randall  

E-Print Network [OSTI]

. Randall Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado, USA Received

Randall, David A.

147

Towards explaining the Nd paradox using reversible scavenging in an ocean general circulation model  

E-Print Network [OSTI]

(Piepgras et al., 1979; Goldstein and O'Nions, 1981; Frank, 2002; Tachikawa et al., 2003; Goldstein; Piepgras and Wasser- burg 1983; Jeandel,1993; Tachikawa et al.,1999; Tachikawa et al., 2003), long enough

Khatiwala, Samar

148

Generalized Terminal Modeling of Electromagnetic Interference  

SciTech Connect (OSTI)

Terminal models have been used for various applications. In this paper, a three-terminal model is proposed for electromagnetic-interference (EMI) characterization. The model starts with a power electronic system at a particular operating condition and creates a unique linearized equivalent circuit. Impedances and current/voltage sources define the noise throughout the entire EMI frequency spectrum. All parameters needed to create the model are clearly defined to ensure convergence and maximize accuracy. In addition, the accuracy of the model is confirmed up to 100 MHz for a dc-dc boost converter using both simulation and experimental validation.

Baisden, Andrew Carson [IEEE Industrial Applications Society; Boroyevich, Dushan [Virginia Polytechnic Institute and State University (Virginia Tech); Wang, Fei [ORNL

2010-01-01T23:59:59.000Z

149

The southern ocean meridional overturning circulation as diagnosed from an eddy permitting state estimate  

E-Print Network [OSTI]

A modern general circulation model of the Southern Ocean with one-sixth of a degree resolution is optimized to the observed ocean in a weighted least squares sense. Convergence to the state estimate solution is carried out ...

Mazloff, Matthew R

2008-01-01T23:59:59.000Z

150

Japan Sea Thermohaline Structure and Circulation. Part II: A Variational P-Vector Method  

Science Journals Connector (OSTI)

The second part of this work investigates the seasonal variabilities of the Japan/East Sea (JES) circulation using the U.S. Navy Generalized Digital Environmental Model (GDEM) climatological temperature and salinity dataset (public domain) on a ...

Peter C. Chu; Jian Lan; Chenwu Fan

2001-10-01T23:59:59.000Z

151

A Generalized Pyrolysis Model for Combustible Solids  

E-Print Network [OSTI]

model. ?H c is the heat of combustion, and the ratio ?H c /?may have widely varying heats of combustion (CO vs. gaseous

Lautenberger, Chris

2007-01-01T23:59:59.000Z

152

Simulation of the Diurnal Cycle in Tropical Rainfall and Circulation during Boreal Summer with a High-Resolution GCM  

Science Journals Connector (OSTI)

The simulation of the diurnal cycle (DC) of precipitation and surface wind pattern by a general circulation model (GCM) with a uniform horizontal resolution of 50 km over the global domain is evaluated. The model output is compared with ...

Jeffrey J. Ploshay; Ngar-Cheung Lau

2010-09-01T23:59:59.000Z

153

Testing Generalized Linear Models Using Smoothing Spline Methods  

E-Print Network [OSTI]

Testing Generalized Linear Models Using Smoothing Spline Methods Anna Liu, Wendy Meiring and Yuedong Wang University of California, Santa Barbara Abstract This article considers testing exponential families. The tests developed are based on the connection between the smoothing spline models

Meiring, Wendy

154

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

155

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

156

Generalized Widom model of amphiphilic systems  

Science Journals Connector (OSTI)

An additional two-particle interaction is introduced in the Widom model of microemulsions in order to produce three-phase coexistence between the oil-rich, water-rich, and disordered fluid phases in accordance with experimental results. We test the resulting model numerically through Monte Carlo simulations. We observe a hysteresis in the order parameter and a jump in the surface tension at the transition between the disordered fluid and water-rich and oil-rich phases, thus signifying a first-order transition with three-phase coexistence.

Alex Hansen; M. Schick; D. Stauffer

1991-09-15T23:59:59.000Z

157

Efficient inference in general semiparametric regression models  

E-Print Network [OSTI]

Conclusions ................. 33 II.5.3.1. Can Semiparametric Methods Improve Upon the Sample Mean? .......... 34 II.5.3.2. How Critical Are Our Assumptions on Z?35 III TESTING IN SEMIPARAMETRIC MODELS WITH IN- TERACTION ............................ 38 III.1... ........................................ 134 x LIST OF TABLES TABLE Page 1. Significance levels (p-values) of the test for genetic e?ects in a regression model in which Z is years since stopped smoking. ..... 68 2. Mean, empirical standard errors (emp s.e.), root mean squared error (RMSE...

Maity, Arnab

2009-05-15T23:59:59.000Z

158

INVESTIGATION A General Mechanistic Model for Admixture  

E-Print Network [OSTI]

model of admixture that mechanistically accounts for complex historical admixture processes. We consider about the historical admixture processes contributing to the genetic diversity of hybrid populations; Tang et al. 2006; Sankararaman et al. 2008; Bercovici and Geiger 2009; Price et al. 2009). Admixed

Rosenberg, Noah

159

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

160

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

Note: This page contains sample records for the topic "general circulation models" 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

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°

162

Generalized Rough Set Models Department of Computer Science  

E-Print Network [OSTI]

Generalized Rough Set Models Y.Y. Yao Department of Computer Science Lakehead University Thunder the rough set theory in early eighties, many proposals have been made for generalizing and interpreting rough sets [3, 4, 19, 27, 37, 38, 39, 46, 47, 51, 52, 54, 55, 63, 65, 66, 67, 68, 69, 70, 71, 72, 83, 92

Yao, Yiyu

163

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

164

Time-Dependent Nonlinear Hadley Circulation  

Science Journals Connector (OSTI)

The time-dependent Hadley circulation is studied numerically in a nonlinear, nearly inviscid, axially symmetric primitive equation model, with the heating varying periodically on an annual cycle. The annual average of the Hadley circulation ...

Ming Fang; Ka Kit Tung

1999-06-01T23:59:59.000Z

165

Adventive Hydrothermal Circulation On Stromboli Volcano (Aeolian Islands,  

Open Energy Info (EERE)

Adventive Hydrothermal Circulation On Stromboli Volcano (Aeolian Islands, Adventive Hydrothermal Circulation On Stromboli Volcano (Aeolian Islands, Italy) Revealed By Geophysical And Geochemical Approaches- Implications For General Fluid Flow Models On Volcanoes Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Adventive Hydrothermal Circulation On Stromboli Volcano (Aeolian Islands, Italy) Revealed By Geophysical And Geochemical Approaches- Implications For General Fluid Flow Models On Volcanoes Details Activities (0) Areas (0) Regions (0) Abstract: On March 15th 2007 a paroxysmal explosion occurred at the Stromboli volcano. This event generated a large amount of products, mostly lithic blocks, some of which impacted the ground as far as down to 200 m a.s.l., about 1.5 km far away from the active vents. Two days after the

166

Roles of Equatorial Waves and Western Boundary Reflection in the Seasonal Circulation of the Equatorial Indian Ocean  

E-Print Network [OSTI]

Roles of Equatorial Waves and Western Boundary Reflection in the Seasonal Circulation of Colorado, Boulder, Colorado (Manuscript received 17 May 2005, in final form 26 October 2005) ABSTRACT An ocean general circulation model (OGCM) is used to study the roles of equatorial waves and western

Han, Weiqing

167

Stochastic models of the meridional overturning circulation: time scales and patterns of variability  

Science Journals Connector (OSTI)

...model captures the essential physics of the advective feedback bistability...to a Theme Issue Stochastic physics and climate modelling. Figure...038501 . Gardiner, C.W Handbook of stochastic methods for physics, chemistry, and the natural...

2008-01-01T23:59:59.000Z

168

Assessment of Modes of Interannual Variability of Southern Hemisphere Atmospheric Circulation in CMIP5 Models  

Science Journals Connector (OSTI)

An assessment is made of the modes of interannual variability in the seasonal mean summer and winter Southern Hemisphere (SH) 500-hPa geopotential height in the twentieth century in models from the Coupled Model Intercomparison Project (CMIP) ...

Simon Grainger; Carsten S. Frederiksen; Xiaogu Zheng

2014-11-01T23:59:59.000Z

169

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

170

Random Item Modeling: An Extension and Generalization of MIRID models  

E-Print Network [OSTI]

be seen in both the RF- and the RR-MIRD models and meets ourthe FR- MIRID and the RR-MIRD show the better fit than thestudy shows how various RI-MIRD models fit verbal aggression

Lee, Yongsang

2010-01-01T23:59:59.000Z

171

Generalized Chaplygin gas model: Cosmological consequences and statefinder diagnosis  

E-Print Network [OSTI]

The generalized Chaplygin gas (GCG) model in spatially flat universe is investigated. The cosmological consequences led by GCG model including the evolution of EoS parameter, deceleration parameter and dimensionless Hubble parameter are calculated. We show that the GCG model behaves as a general quintessence model. The GCG model can also represent the pressureless CDM model at the early time and cosmological constant model at the late time. The dependency of transition from decelerated expansion to accelerated expansion on the parameters of model is investigated. The statefinder parameters $r$ and $s$ in this model are derived and the evolutionary trajectories in $s-r$ plane are plotted. Finally, based on current observational data, we plot the evolutionary trajectories in $s-r$ and $q-r$ planes for best fit values of the parameters of GCG model. It has been shown that although, there are similarities between GCG model and other forms of chaplygin gas in statefinder plane, but the distance of this model from the $\\Lambda$CDM fixed point in $s-r$ diagram is shorter compare with standard chaplygin gas model.

M. Malekjani; A. Khodam-Mohammadi; N. Nazari-Pooya

2011-03-09T23:59:59.000Z

172

Estimating Probability Distributions from Complex Models with Bifurcations: The Case of Ocean Circulation Collapse  

E-Print Network [OSTI]

Studying the uncertainty in computationally expensive models has required the development of specialized methods, including alternative sampling techniques and response surface approaches. However, existing techniques for ...

Webster, Mort David.

173

Impact of large scale circulation on European summer surface ozone and consequences for modelling forecast  

E-Print Network [OSTI]

of using day-to-day varying chemical boundary conditions produced by a global chemical weather forecast platform instead of climatological monthly means at the frontiers of a regional model. We performed two- transport models (CTMs) that represent physical and chemical processes controlling ozone concentrations

Menut, Laurent

174

Testing Linear Diagnostics of Ensemble Performance on a Simplified Global Circulation Model  

E-Print Network [OSTI]

Ensemble weather forecast systems are used to account for the uncertainty in the initial conditions of the atmosphere and the chaotic dynamics of the models. It has been previously found that forecast performance of an ensemble forecast system...

Nelson, Ethan

2011-04-21T23:59:59.000Z

175

The Sensitivity of the Hadley Circulation to Past and Future Forcings in Two Climate Models  

Science Journals Connector (OSTI)

A comparison is made of the Hadley cell response to altered external forcing and...2.... Both models have a consistent response to all forcings in the depth and meridional extent of the Hadley cell in both solsti...

Bette L. Otto-Bliesner; Amy Clement

2004-01-01T23:59:59.000Z

176

The Transition-Zone Water Filter Model for Global Material Circulation: Where Do We Stand?  

E-Print Network [OSTI]

with a small melt fraction, highly incompatible elements including hydro- gen, helium and argon are sequestered the fraction of water is small. Models have been developed to understand the structure of a melt layer Hilst, et al., 1997]), then the whole mantle is depleted with only a small volume (~10%) of relatively

177

A General Model for Designing Networks of Marine Reserves  

E-Print Network [OSTI]

. Networks of marine reserves can be an im- portant tool for the conservation of marine biodiversity (1A General Model for Designing Networks of Marine Reserves Enric Sala,1 * Octavio Aburto-Oropeza,2 effective conservation of marine biodi- versity, especially regarding the appropriate location, size

deYoung, Brad

178

Collateral circulation prevents masticatory muscle impairment in rat middle cerebral artery occlusion model  

Science Journals Connector (OSTI)

The rat suture middle cerebral artery occlusion (MCAO) is a frequently used animal model for investigating the mechanisms of ischemic brain injury. During suture MCAO, transection of the external carotid artery (ECA) potentially restrains blood flow and impairs masticatory muscle and other ECA-supported territories, consequently influencing post-operation animal survival. This study investigates the effect of ECA transection on the hemodynamic alterations using a novel synchrotron radiation angiography technique and magnetic resonance imaging.

Yuan, F.

2014-10-01T23:59:59.000Z

179

System Advisor Model, SAM 2011.12.2: General Description  

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

180

A preliminary model of the circulating blood for use in radiation dose calculations  

E-Print Network [OSTI]

of Advisory Committee: Dr. John W. Poston Currently, there is a need for a dosimetric model to describe the circulatory system in an adult human. This need exists because of the increasing number of radiopharmaceuticals used in nuclear medicine which... Administered Activity for Indium-113m-labeled Blood Platelets for Selected Organs biological data on blood volume and distribution in the circulatory system (A163, Ba61, Co71, Fo71, Sm84, Mc74) . Only major organs that contain large amounts of blood were...

Hui, Tsz-Yik Edmond

1986-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "general circulation models" 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

Design of a General Plasma Simulation Model, Fundamental Aspects and Applications  

E-Print Network [OSTI]

Design of a General Plasma Simulation Model, Fundamental Aspects and Applications PROEFONTWERP ter, Gerard Maria Design of a General Plasma Simulation Model, Fundamental Aspects and Applications

Eindhoven, Technische Universiteit

182

Criticality and universality in a generalized earthquake model  

SciTech Connect (OSTI)

We propose that an appropriate prototype for modeling self-organized criticality in dissipative systems is a generalized version of the two-variable cellular automata model introduced by Hergarten and Neugebauer [Phys. Rev. E 61, 2382 (2000)]. We show that the model predicts exponents for the event size distribution which are consistent with physically observed results for dissipative phenomena such as earthquakes. In addition we provide evidence that the model is critical based on both scaling analyses and direct observation of the distribution and behavior of the two variables in the interior of the lattice. We further argue that for reasonably large lattices the results are universal for all dissipative choices of the model parameters.

Boulter, C.J.; Miller, G. [Department of Mathematics, School of Mathematical and Computer Sciences, Scott Russell Building, Heriot-Watt University, Edinburgh EH14 4AS (United Kingdom)

2005-01-01T23:59:59.000Z

183

Hadley Circulation Dynamics  

Science Journals Connector (OSTI)

The equations that govern the Hadley circulation are reviewed, and the observed circulation ... zonally averaged momentum and thermodynamic balances within the Hadley regime.

Kerry H. Cook

2004-01-01T23:59:59.000Z

184

Global Ocean Circulation Modeling with an Isopycnic Coordinate Model. Final Report for May 1, 1998 - April 30, 2002  

SciTech Connect (OSTI)

The overall aim of this project was to continue development of a global version of the Miami Isopycnic Coordinate Ocean Model (MICOM) with the intent of turning it into a full-fledged oceanic component of an earth system model.

Bleck, R.

2004-05-19T23:59:59.000Z

185

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

186

A Model Independent General Search for new physics in ATLAS  

E-Print Network [OSTI]

We present results of a model-independent general search for new phenomena in proton-proton collisions at a centre-of-mass energy of 8 TeV with the ATLAS detector at the LHC. The data set corresponds to a total integrated luminosity of 20.3~\\ifb. Event topologies involving isolated electrons, photons and muons, as well as jets, including those identified as originating from \\textit{b}-quarks (\\textit{b}-jets) and missing transverse momentum are investigated. The events are subdivided according to their final states into exclusive event classes. For the 697 classes with a Standard Model expectation greater than 0.1 events, a search algorithm tests the compatibility of data against the Monte Carlo simulated background in three kinematic variables sensitive to new physics effects. No significant deviation is found in data. The number and size of the observed deviations follow the Standard Model expectation obtained from simulated pseudo-experiments.

Amoroso, S; The ATLAS collaboration

2014-01-01T23:59:59.000Z

187

Generalized Cosmic Chaplygin Gas Model with or without Interaction  

E-Print Network [OSTI]

Recently developed Generalized Cosmic Chaplygin gas (GCCG) is studied as an unified model of dark matter and dark energy. To explain the recent accelerating phase, the Universe is assumed to have a mixture of radiation and GCCG. The mixture is considered for without or with interaction. Solutions are obtained for various choices of the parameters and trajectories in the plane of the statefinder parameters and presented graphically. For particular choice of interaction parameter, we have shown the role of statefinder parameters in various cases for the evolution of the Universe.

Writambhara Chakraborty; Ujjal Debnath; Subenoy Chakraborty

2007-11-01T23:59:59.000Z

188

Lost Circulation Experience in Geothermal Wells  

SciTech Connect (OSTI)

Lost circulation during drilling and cementing in geothermal wells is a problem common to most geothermal areas. Material and rig time costs due to lost circulation often represent one fourth or more of the total well cost. Assessment of the general drilling and completion practices commonly used for handling lost circulation have been surveyed and evaluated under a study sponsored by Sandia National Laboratories. Results of this study, including interviews with geothermal production companies and with drilling fluid service companies, are reported in the paper. Conclusions and recommendations are presented for control of lost circulation during geothermal operations. Recent improvements in lost circulation materials and techniques and potential equipment solutions to the lost circulation problem are discussed. Research needs are also identified.

Goodman, M. A.

1981-01-01T23:59:59.000Z

189

A general stochastic model for sporophytic self-incompatibility  

E-Print Network [OSTI]

Disentangling the processes leading populations to extinction is a major topic in ecology and conservation biology. The difficulty to find a mate in many species is one of these processes. Here, we investigate the impact, on the extinction probability, of self-incompatibility in flowering plants, where several inter-compatible classes of individuals exist but individuals of the same class cannot mate. We model pollen limitation through different relationships between mate availability and fertilization success. After deriving a general stochastic model, we focus on the simple case of distylous plant species where only two classes of individuals exist. We first investigate the dynamics of such a species in a large population limit and then, we look for an approximation of the extinction probability in small populations. This leads us to consider inhomogeneous random walks on the positive quadrant. We compare the dynamics of distylous species to self-fertile species with and without inbreeding depression, to in...

Billiard, Sylvain

2010-01-01T23:59:59.000Z

190

Electromagnetic Mass Models in General Theory of Relativity  

E-Print Network [OSTI]

"Electromagnetic mass" where gravitational mass and other physical quantities originate from the electromagnetic field alone has a century long distinguished history. In the introductory chapter we have divided this history into three broad categories -- classical, quantum mechanical and general relativistic. Each of the categories has been described at a length to get the detailed picture of the physical background. Recent developments on Repulsive Electromagnetic Mass Models are of special interest in this introductory part of the thesis. In this context we have also stated motivation of our work. In the subsequent chapters we have presented our results and their physical significances. It is concluded that the electromagnetic mass models which are the sources of purely electromagnetic origin ``have not only heuristic flavor associated with the conjecture of Lorentz but even a physics having unconventional yet novel features characterizing their own contributions independent of the rest of the physics".

Sumana Bhadra

2007-10-30T23:59:59.000Z

191

Simple ocean carbon cycle models  

SciTech Connect (OSTI)

Simple ocean carbon cycle models can be used to calculate the rate at which the oceans are likely to absorb CO{sub 2} from the atmosphere. For problems involving steady-state ocean circulation, well calibrated ocean models produce results that are very similar to results obtained using general circulation models. Hence, simple ocean carbon cycle models may be appropriate for use in studies in which the time or expense of running large scale general circulation models would be prohibitive. Simple ocean models have the advantage of being based on a small number of explicit assumptions. The simplicity of these ocean models facilitates the understanding of model results.

Caldeira, K. [Lawrence Livermore National Lab., CA (United States); Hoffert, M.I. [New York Univ., NY (United States). Dept. of Earth System Sciences; Siegenthaler, U. [Bern Univ. (Switzerland). Inst. fuer Physik

1994-02-01T23:59:59.000Z

192

Long-term effects of anthropogenic CO2 emissions simulated with a complex earth system model  

E-Print Network [OSTI]

Long-term effects of anthropogenic CO2 emissions simulated with a complex earth system model Uwe earth system model con- sisting of an atmospheric general circulation model, an ocean general

Winguth, Arne

193

Modeling Alloy 22 general corrosion in the Yucca Mountain nuclear waste repository  

Science Journals Connector (OSTI)

This paper presents the general corrosion model used by the Yucca Mountain Project to account for general corrosion degradation of the Alloy 22 waste package outer barrier. The general corrosion rates were det...

Kevin G. Mon; Brvan E. Bullard; Fred Hua; Gopal C. De

2008-01-01T23:59:59.000Z

194

The Elementary Hadley Circulation  

Science Journals Connector (OSTI)

In the most basic terms, the Hadley circulation can be thought of as a ... Variability of the location and intensity of the Hadley circulation (or its regional manifestation such as ... periods of drought. The va...

Peter J. Webster

2004-01-01T23:59:59.000Z

195

The impact of oceanic heat transport on the atmospheric circulation  

E-Print Network [OSTI]

A general circulation model of intermediate complexity with an idealized earthlike aquaplanet setup is used to study the impact of changes in the oceanic heat transport on the global atmospheric circulation. Focus is put on the Lorenz energy cycle and the atmospheric mean meridional circulation. The latter is analysed by means of the Kuo-Eliassen equation. The atmospheric heat transport compensates the imposed oceanic heat transport changes to a large extent in conjunction with significant modification of the general circulation. Up to a maximum about 3PW, an increase of the oceanic heat transport leads to an increase of the global mean near surface temperature and a decrease of its equator-to-pole gradient. For larger transports, the gradient is reduced further but the global mean remains approximately constant. This is linked to a cooling and a reversal of the temperature gradient in the tropics. A larger oceanic heat transport leads to a reduction of all reservoirs and conversions of the Lorenz energy cycl...

Knietzsch, Marc-Andre; Lunkeit, Frank

2014-01-01T23:59:59.000Z

196

Convective Precipitation Variability as a Tool for General Circulation Model Analysis CHARLOTTE A. DEMOTT, DAVID A. RANDALL, AND MARAT KHAIROUTDINOV  

E-Print Network [OSTI]

. DEMOTT, DAVID A. RANDALL, AND MARAT KHAIROUTDINOV Department of Atmospheric Science, Colorado State

Randall, David A.

197

OCEAN GENERAL CIRCULATION MODELLING OF THE NORDIC SEAS Helge Drange, Rdiger Gerdes, Yongqi Gao, Michael Karcher, Frank Kauker, Mats Bentsen  

E-Print Network [OSTI]

by characteristic length scales of only a few to about ten km, a variety of complex and interrelated ocean processes physical and dynamical processes, parallel development of at least three classes of OGCM systems, accurate-of-the-art OGCM systems are used. The paper also addresses processes that are still inadequately described

Drange, Helge

198

Carbon-nitrogen interactions regulate climate-carbon cycle feedbacks: results from an atmosphere-ocean general circulation model  

E-Print Network [OSTI]

2009 P. E. Thornton et al. : Carbon-nitrogen interactionsregulate climate-carbon cycle feedbacks Monfray, P. ,T. H. : A global ocean carbon climatology: Results from

2009-01-01T23:59:59.000Z

199

The Effect of a Large Freshwater Perturbation on the Glacial North Atlantic Ocean Using a Coupled General Circulation Model  

Science Journals Connector (OSTI)

The commonly held view of the conditions in the North Atlantic at the last glacial maximum, based on the interpretation of proxy records, is of large-scale cooling compared to today, limited deep convection, and extensive sea ice, all associated ...

C. D. Hewitt; A. J. Broccoli; M. Crucifix; J. M. Gregory; J. F. B. Mitchell; R. J. Stouffer

2006-09-01T23:59:59.000Z

200

Testing Simple Models of ENSO  

Science Journals Connector (OSTI)

The realistic simulation of El Niño–Southern Oscillation (ENSO) by the University of California, Los Angeles (UCLA), coupled atmosphere–ocean general circulation model (CGCM) is used to test two simple theoretical models of the phenomenon: the ...

Carlos R. Mechoso; J. David Neelin; Jin-Yi Yu

2003-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "general circulation models" 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

The Roles of the Hadley Circulation and Downward Control in Tropical Upwelling  

Science Journals Connector (OSTI)

Several idealized models of tropical upwelling are presented in order to clarify the roles of the nonlinear Hadley circulation and extratropical wave driving. In particular, it is shown that the Hadley circulation and wave-driven circulation ...

Tiehan Zhou; Marvin A. Geller; Kevin Hamilton

2006-11-01T23:59:59.000Z

202

E-Print Network 3.0 - atmospheric circulation features Sample...  

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

Page: << < 1 2 3 4 5 > >> 1 12.812: The general circulation of the atmosphere and climate change Instructor: Paul O'Gorman Summary: 12.812: The general circulation of the...

203

Proton radioactivity within a generalized liquid drop model  

E-Print Network [OSTI]

The proton radioactivity half-lives of spherical proton emitters are investigated theoretically. The potential barriers preventing the emission of protons are determined in the quasimolecular shape path within a generalized liquid drop model (GLDM) including the proximity effects between nuclei in a neck and the mass and charge asymmetry. The penetrability is calculated with the WKB approximation. The spectroscopic factor has been taken into account in half-life calculation, which is obtained by employing the relativistic mean field (RMF) theory combined with the BCS method with the force NL3. The half-lives within the GLDM are compared with the experimental data and other theoretical values. The GLDM works quite well for spherical proton emitters when the spectroscopic factors are considered, indicating the necessity of introducing the spectroscopic factor and the success of the GLDM for proton emission. Finally, we present two formulas for proton emission half-life calculation similar to the Viola-Seaborg formulas and Royer's formulas of alpha decay.

J. M. Dong; H. F. Zhang; G. Royer

2009-06-02T23:59:59.000Z

204

ON THE PENETRATION OF MERIDIONAL CIRCULATION BELOW THE SOLAR CONVECTION ZONE. II. MODELS WITH CONVECTION ZONE, THE TAYLOR-PROUDMAN CONSTRAINT, AND APPLICATIONS TO OTHER STARS  

SciTech Connect (OSTI)

The solar convection zone exhibits a strong level of differential rotation, whereby the rotation period of the polar regions is about 25%-30% longer than the equatorial regions. The Coriolis force associated with these zonal flows perpetually 'pumps' the convection zone fluid, and maintains a quasi-steady circulation, poleward near the surface. What is the influence of this meridional circulation on the underlying radiative zone, and in particular, does it provide a significant source of mixing between the two regions? In Paper I, we began to study this question by assuming a fixed meridional flow pattern in the convection zone and calculating its penetration depth into the radiative zone. We found that the amount of mixing caused depends very sensitively on the assumed flow structure near the radiative-convective interface. We continue this hydrodynamic study here by including a simple model for the convection zone 'pump', and calculating in a self-consistent manner the meridional flows generated in the whole Sun. We find that the global circulation timescale depends in a crucial way on two factors: the overall stratification of the radiative zone as measured by the square root of the Prandtl number times the ratio of the Brunt-Vaeisaelae frequency to the rotation rate, and, for weakly stratified systems, the presence or absence of stresses within the radiative zone capable of breaking the Taylor-Proudman constraint. We conclude by discussing the consequences of our findings for the solar interior and argue that a potentially important mechanism for mixing in young main-sequence stars has so far been neglected.

Garaud, P.; Acevedo Arreguin, L. [Department of Applied Mathematics and Statistics, Baskin School of Engineering, University of California Santa Cruz, 1156 High Street, Santa Cruz, CA 95064 (United States)

2009-10-10T23:59:59.000Z

205

Model for Energy Supply System Alternatives and their General...  

Open Energy Info (EERE)

their General Environmental Impacts AgencyCompany Organization: International Atomic Energy Agency Sector: Energy Focus Area: Renewable Energy, Energy Efficiency Topics: Pathways...

206

Modeling the Impacts of Future Climate Change on Irrigation over China: Sensitivity to Adjusted Projections  

Science Journals Connector (OSTI)

Because of the limitations of coarse-resolution general circulation models (GCMs), delta change (DC) methods are generally used to derive scenarios of future climate as inputs into impact models. In this paper, the impact of future climate change ...

Guoyong Leng; Qiuhong Tang

2014-10-01T23:59:59.000Z

207

Interacting generalized Chaplygin gas model in non-flat universe  

E-Print Network [OSTI]

We employ the generalized Chaplygin gas of interacting dark energy to obtain the equation of state for the generalized Chaplygin gas energy density in non-flat universe. By choosing a negative value for $B$ we see that $w_{\\rm \\Lambda}^{eff}< -1$, that corresponds to a universe dominated by phantom dark energy.

M R Setare

2007-11-04T23:59:59.000Z

208

A single model of traversable wormholes supported by generalized phantom energy or Chaplygin gas  

E-Print Network [OSTI]

This paper discusses a new variable equation of state parameter leading to exact solutions of the Einstein field equations describing traversable wormholes. In addition to generalizing the notion of phantom energy, the equation of state generates a mathematical model that combines the generalized phantom energy and the generalized Chaplygin gas models.

Peter K. F. Kuhfittig

2009-04-22T23:59:59.000Z

209

Generalized charge-screening in relativistic Thomas–Fermi model  

SciTech Connect (OSTI)

In this paper, we study the charge shielding within the relativistic Thomas-Fermi model for a wide range of electron number-densities and the atomic-number of screened ions. A generalized energy-density relation is obtained using the force-balance equation and taking into account the Chandrasekhar's relativistic electron degeneracy pressure. By numerically solving a second-order nonlinear differential equation, the Thomas-Fermi screening length is investigated, and the results are compared for three distinct regimes of the solid-density, warm-dense-matter, and white-dwarfs (WDs). It is revealed that our nonlinear screening theory is compatible with the exponentially decaying Thomas-Fermi-type shielding predicted by the linear response theory. Moreover, the variation of relative Thomas-Fermi screening length shows that extremely dense quantum electron fluids are relatively poor charge shielders. Calculation of the total number of screening electrons around a nucleus shows that there is a position of maximum number of screening localized electrons around the screened nucleus, which moves closer to the point-like nucleus by increase in the plasma number density but is unaffected due to increase in the atomic-number value. It is discovered that the total number of screening electrons, (N{sub s}?r{sub TF}{sup 3}/r{sub d}{sup 3} where r{sub TF} and r{sub d} are the Thomas-Fermi and interparticle distance, respectively) has a distinct limit for extremely dense plasmas such as WD-cores and neutron star crusts, which is unique for all given values of the atomic-number. This is equal to saying that in an ultrarelativistic degeneracy limit of electron-ion plasma, the screening length couples with the system dimensionality and the plasma becomes spherically self-similar. Current analysis can provide useful information on the effects of relativistic correction to the charge screening for a wide range of plasma density, such as the inertial-confined plasmas and compact stellar objects.

Akbari-Moghanjoughi, M. [Department of Physics, Faculty of Sciences, Azarbaijan Shahid Madani University, 51745-406 Tabriz, Iran and International Centre for Advanced Studies in Physical Sciences and Institute for Theoretical Physics, Ruhr University Bochum, D-44780 Bochum (Germany)

2014-10-15T23:59:59.000Z

210

Generalizing the running vacuum energy model and comparing with the entropic-force models  

E-Print Network [OSTI]

We generalize the previously proposed running vacuum energy model by including a term proportional to \\dot{H}, in addition to the existing H^2 term. We show that the added degree of freedom is very constrained if both low redshift and high redshift data are taken into account. Best-fit models are undistinguishable from LCDM at the present time, but could be distinguished in the future with very accurate data at both low and high redshifts. We stress the formal analogy at the phenomenological level of the running vacuum models with recently proposed dark energy models based on the holographic or entropic point of view, where a combination of \\dot{H} and H^2 term is also present. However those particular entropic formulations which do not have a constant term in the Friedmann equations are not viable. The presence of this term is necessary in order to allow for a transition from a decelerated to an accelerated expansion. In contrast, the running vacuum models, both the original and the generalized one introduced here contain this constant term in a more natural way. Finally, important conceptual issues common to all these models are emphasized.

Spyros Basilakos; David Polarski; Joan Sola

2012-07-19T23:59:59.000Z

211

PERSPECTIVE Patterns and causes of species richness: a general simulation model for macroecology  

E-Print Network [OSTI]

IDEA AND PERSPECTIVE Patterns and causes of species richness: a general simulation model. The output from such a general simulation model (GSM) would, at a minimum, consist of the simulated forces. As an alternative, we propose a mechanistic modelling approach. We describe computer simulation

Arita, Héctor T.

212

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

213

Smoothing in dynamic generalized linear models by Gibbs sampling  

Science Journals Connector (OSTI)

Optimal filtering and smoothing in non-Gaussian dynamic models based on ... approach for obtaining posterior mean smoothers in the exponential family framework. Implementation and performance are investigated...

Ludwig Fahrmeir; Wolfgang Hennevogl…

1992-01-01T23:59:59.000Z

214

Formalism for the construction of binary neutron stars with arbitrary circulation  

SciTech Connect (OSTI)

Most numerical models of binary stars - in particular neutron stars in compact binaries - assume the companions to be either corotational or irrotational. Either one of these assumptions leads to a significant simplification in the hydrodynamic equations of stationary equilibrium. In this paper we develop a new formalism for the construction of binary stars with circulation intermediate between corotational and irrotational. Generalizing the equations for irrotational flow we cast the Euler equation, which is an algebraic equation in the case of corotational or irrotational fluid flow, as an elliptic equation for a new auxiliary quantity. We also suggest a parametrized decomposition of the fluid flow that allows for a variation of the stellar circulation.

Baumgarte, Thomas W. [Department of Physics and Astronomy, Bowdoin College, Brunswick, Maine 04011 (United States); Shapiro, Stuart L. [Department of Physics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801 (United States)

2009-09-15T23:59:59.000Z

215

Modeling DFIG Using General Vector Representation in the Presence of Harmonics  

Science Journals Connector (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

216

Generalized Additive Models versus Linear Regression in Generating Probabilistic MOS Forecasts of Aviation Weather Parameters  

Science Journals Connector (OSTI)

The skill of probabilistic Model Output Statistics forecasts generated from Generalized Additive Models (GAM) is compared to that of traditional multiple linear regression techniques. Unlike linear regression, where each predictor term in the ...

Robert L. Vislocky; J. Michael Fritsch

1995-12-01T23:59:59.000Z

217

OLAF _ A General Modeling System to Evaluate and Optimize the Location of an Air  

E-Print Network [OSTI]

OLAF _ A General Modeling System to Evaluate and Optimize the Location of an Air Polluting Facility Project Report J"org Fliege 13 2.1The Meteorological Preprocessor ..................13 2.2The Air Dispersion Model

Fliege, Jörg

218

Hospital Readmission in General Medicine Patients: A Prediction Model  

E-Print Network [OSTI]

J Med. 1985;313: JGIM Hasan et al. : Hospital ReadmissionA Prediction Model Omar Hasan, MBBS, MPH 1,2 , David O.online December 15, 2009 Hasan et al. : Hospital Readmission

2010-01-01T23:59:59.000Z

219

Augmented Lagrangian method for generalized TV-Stokes model  

E-Print Network [OSTI]

reducing stair-case effect. Keyword: TV-Stokes model, Augmented Lagrangian method, Image inpainting, Image and stair-case effect [6­10]. The authors [9] showed that the TV-L2 model never recover the same contrast-010 and MOE (Ministry of Education) Tier II project T207N2202. jyhahn@ntu.edu.sg CLWU@ntu.edu.sg §xctai@ntu

Soatto, Stefano

220

A GENERAL INVESTMENT MODEL Thomas S. Ferguson and C. Zachary Gilstein  

E-Print Network [OSTI]

A GENERAL INVESTMENT MODEL Thomas S. Ferguson and C. Zachary Gilstein UCLA and Bell Communications Revised May 1985 Abstract. A Bayesian approach to a general investment model is proposed based on knowledge of the probability distributions of possible investment re- turns (future market events

Ferguson, Thomas S.

Note: This page contains sample records for the topic "general circulation models" 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

From residue matching patterns to protein folding topographies: General model and bovine  

E-Print Network [OSTI]

From residue matching patterns to protein folding topographies: General model and bovine pancreatic-grained model for protein-folding dynamics is introduced based on a discretized representation of torsional, pattern recognition, and general characteristics of protein folding kinetics. Topology here implies

Berry, R. Stephen

222

Properties of the general N-Higgs-doublet model. I. The orbit space  

SciTech Connect (OSTI)

We study the scalar sector of the general N-Higgs-doublet model via geometric constructions in the space of gauge orbits. We give a detailed description of the shape of the orbit space both for general N and, in more detail, for N=3. We also comment on remarkable analogies between the N-Higgs-doublet model and quantum information theory.

Ivanov, I. P. [IFPA, Universite de Liege, Allee du 6 Aout 17, batiment B5a, 4000 Liege (Belgium); Sobolev Institute of Mathematics, Koptyug Avenue 4, 630090, Novosibirsk (Russian Federation); Nishi, C. [Universidade Federal do ABC, Rua Santa Adelia, 166, 09.210-170, Santo Andre, Sao Paulo (Brazil)

2010-07-01T23:59:59.000Z

223

Dark Energy - Dark Matter Unification: Generalized Chaplygin Gas Model  

E-Print Network [OSTI]

We review the main features of the generalized Chaplygin gas (GCG) proposal for unification of dark energy and dark matter and discuss how it admits an unique decomposition into dark energy and dark matter components once phantom-like dark energy is excluded. In the context of this approach we consider structure formation and show that unphysical oscillations or blow-up in the matter power spectrum are not present. Moreover, we demonstrate that the dominance of dark energy occurs about the time when energy density fluctuations start evolving away from the linear regime.

Orfeu Bertolami

2005-04-14T23:59:59.000Z

224

Assessment of the ocean circulation in the Azores region as predicted by a numerical model assimilating altimeter data  

E-Print Network [OSTI]

) on the new perspectives in data assimilation). In the SIMAN project (SIMulation de l'Atlantique Nord Stream area (Blayo et al., 1996). It has been shown that the model is able to reproduce

Paris-Sud XI, Université de

225

Parameter Estimation Using Ensemble Based Data Assimilation in the Presence of Model Error  

Science Journals Connector (OSTI)

This work explores the potential of on-line parameter estimation as a technique for model error treatment under an imperfect model scenario, in an ensemble-based data assimilation system, using a simple atmospheric general circulation model and an ...

Juan Ruiz; Manuel Pulido

226

MPO 612 -LARGE-SCALE OCEAN CIRCULATION W. JOHNS -SPRING 2010  

E-Print Network [OSTI]

) - Observations of the Deep Circulation - Deep Western Boundary Currents - Role of the Southern Ocean - The Upper-OceanMPO 612 - LARGE-SCALE OCEAN CIRCULATION W. JOHNS - SPRING 2010 The course will cover basic theories of the wind driven and thermohaline circulation of the oceans. Numerical models of ocean circulation

Miami, University of

227

EFFECT OF THE HADLEY CIRCULATION ON THE REFLECTION OF PLANETARY WAVES IN THREE-DIMENSIONAL  

E-Print Network [OSTI]

EFFECT OF THE HADLEY CIRCULATION ON THE REFLECTION OF PLANETARY WAVES IN THREE-equation model that includes a representation of the Hadley circulation. The Hadley circulation is forced symmetric component of the ow. To quantify the e#11;ect of the Hadley circulation on wave propagation

Magnusdottir, Gudrun

228

Development and Implementation of a Composite Model for Wave, Circulation, and Sediment Processes in Ibaka Deep Seaport in Nigeria  

E-Print Network [OSTI]

for economic empowerment of both local residents and the state. This study has three segments: field experiments, numerical experiments and data analyses. NearCoM-­?TVD was chosen as the base model for this study because of its efficiency, accuracy...

Paul, Ephraim Udo

2014-06-20T23:59:59.000Z

229

Observed Characteristics of Clouds and Precipitating Systems Associated with the Tropical Circulation in Global Models and Reanalyses  

E-Print Network [OSTI]

............................................................................ 90 a. Reanalysis Datasets .................................................................. 90 b. ISCCP Cloud Regimes ............................................................. 92 c. Model Setup... FIGURE Page A-1 Annual average, zonal mean meridional mass streamfunction values for each reanalysis dataset during the 1979-2008 period ............ 144 A-2 Same as Fig. A-1, but for JJA...

Stachnik, Justin Paul

2013-03-25T23:59:59.000Z

230

System Advisor Model, SAM 2014.1.14: General Description  

SciTech Connect (OSTI)

This document describes the capabilities of the U.S. Department of Energy and National Renewable Energy Laboratory's System Advisor Model (SAM), Version 2013.9.20, released on September 9, 2013. SAM is a computer model that calculates performance and financial metrics 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 photovoltaic, concentrating solar power, solar water heating, wind, geothermal, biomass, and conventional power systems. The financial model can represent financial 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). SAM's advanced simulation options facilitate parametric and sensitivity analyses, and statistical analysis capabilities are available for Monte Carlo simulation and weather variability (P50/P90) studies. SAM can also read input variables from Microsoft Excel worksheets. For software developers, the SAM software development kit (SDK) makes it possible to use SAM simulation modules in their applications written in C/C++, C#, Java, Python, and MATLAB. NREL provides both SAM and the SDK as free downloads at http://sam.nrel.gov. Technical support and more information about the software are available on the website.

Blair, N.; Dobos, A. P.; Freeman, J.; Neises, T.; Wagner, M.; Ferguson, T.; Gilman, P.; Janzou, S.

2014-02-01T23:59:59.000Z

231

System Advisor Model, SAM 2011.12.2: General Description  

SciTech Connect (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

232

Carderock Circulating Water Channel | Open Energy Information  

Open Energy Info (EERE)

Circulating Water Channel Circulating Water Channel Jump to: navigation, search Basic Specifications Facility Name Carderock Circulating Water Channel Overseeing Organization United States Naval Surface Warfare Center Hydrodynamic Testing Facility Type Channel Length(m) 18.3 Beam(m) 6.7 Depth(m) 2.7 Water Type Freshwater Cost(per day) Contact POC Special Physical Features The Circulating Water Channel is a vertical plane, open to the atmosphere test section with a free surface in a closed recirculating water circuit, variable speed, rectangular cross-sectional shape facility. There are 10 large viewing windows on either side of the test section at different elevations and 9 in the bottom; movable bridge spans the test section for ease and versatility in mounting models, rigging bridge is capable of taking towing loads at any one of numerous points up to 35,584 N

233

Sustaining observations of the unsteady ocean circulation  

Science Journals Connector (OSTI)

...through the Straits of Florida provides an estimate...data showed that the energy in the ocean mesoscale...associated costs in fuel, crew, technician...on the accelerated rates of melting in both...Vertical mixing, energy and the general circulation...turbulent kinetic energy inferred from Seagliders...

2014-01-01T23:59:59.000Z

234

Effect of Char Combustion Product Distribution Coefficient on the CFD Modeling of Biomass Gasification in a Circulating Fluidized Bed  

Science Journals Connector (OSTI)

The predicted temperature profile can be used to select the refractory linings or bricks of the gasifier, and the predicted gas composition distribution may help to determine the size and shape of the gasifier. ... The enthalpy source from thermal radiation is computed by the P-1 model:(20, 26)(13)(14)where a, ?s, C, and n are the absorption coefficient, the scattering coefficient, the linear-anisotropic phase function coefficient, and the refractive index of the medium, respectively. ... A 3D unsteady-state CFD model is built in ANSYS Fluent 14.0, and the simulation results will be compared and validated with experimental data by García-Ibañez, et al.(18) Figure 1 shows the schematic diagram of the gasifier for the current studies, which sizes are the same as those of the gasifier used in the experiment. ...

Hui Liu; Ali Elkamel; Ali Lohi; Mazda Biglari

2014-03-12T23:59:59.000Z

235

Sensitivity of Hadley Circulation to Physical Parameters and Resolution through Changing Upper-Tropospheric Ice Clouds Using a Global Cloud-System Resolving Model  

Science Journals Connector (OSTI)

The relationship between upper-tropospheric ice cloud properties and the Hadley circulation intensity is examined through parameter sensitivity studies of global cloud-system-resolving simulations with explicit cloud convection. Experiments under ...

Shin-ichi Iga; Hirofumi Tomita; Yoko Tsushima; Masaki Satoh

2011-06-01T23:59:59.000Z

236

On the effects of circulation, sediment resuspension and biological incorporation by diatoms in an ocean model of aluminium  

E-Print Network [OSTI]

The distribution of dissolved aluminium in the West Atlantic Ocean shows a mirror image with that of dissolved silicic acid, hinting at intricate interactions between the ocean cycling of Al and Si. The marine biogeochemistry of Al is of interest because of its potential impact on diatom opal remineralisation, hence Si availability. Furthermore, the dissolved Al concentration at the surface ocean has been used as a tracer for dust input, dust being the most important source of the bio-essential trace element iron to the ocean. Previously, the dissolved concentration of Al was simulated reasonably well with only a dust source, and scavenging by adsorption on settling biogenic debris as the only removal process. Here we explore the impacts of (i) a sediment source of Al in the Northern Hemisphere (especially north of ~40{\\deg}N), (ii) the imposed velocity field, and (iii) biological incorporation of Al on the modelled Al distribution in the ocean. The sediment source clearly improves the model results, and usin...

van Hulten, Marco; Middag, Rob; de Baar, Hein; Gehlen, Marion; Dutay, Jean-Claude; Tagliabue, Alessandro

2014-01-01T23:59:59.000Z

237

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

SciTech Connect (OSTI)

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

238

Generalized Volume-Averaged Filtration Combustion Model and Its Application for Calculating Carbon Gasifiers  

Science Journals Connector (OSTI)

We have developed a generalized volume-averaged model of filtration combustion of gases taking into account the spatial inhomogeneity of a porous medium and the change in porosity due to the heterogeneous chem...

K. V. Dobrego; I. A. Koznacheev

239

Fourier analysis for generalized cylinders with polar models of cross-sections  

E-Print Network [OSTI]

FOURIER ANALYSIS FOR GENERALIZED CYLINDERS WITH POLAR MODELS OF CROSS-SECTIONS A Thesis by WILLIAM CLARENCE FORSYTHE Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE May 1990 Major Subject: Computer Science FOURIER ANALYSIS FOR GENERALIZED CYLINDERS WITH POLAR MODELS OF CROSS-SECTIONS A Thesis by WILLIAM CLARENCE FORSYTHE Approved as to style and content by: Amitabha Mukerjee (Chair...

Forsythe, William Clarence

2012-06-07T23:59:59.000Z

240

Multi-Attribute Choice Model: An Application of the Generalized Nested Logit Model at the Stock-Keeping Unit Level  

Science Journals Connector (OSTI)

This paper proposes an application of the generalized nested logit (GNL) model which is used in transportation science for product choice problems at the stock-keeping unit level. I explain two alternative nestin...

Kei Takahashi

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "general circulation models" 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

Portable oven air circulator  

DOE Patents [OSTI]

A portable air circulating apparatus for use in cooking ovens which is used to create air currents in the oven which transfer heat to cooking foodstuffs to promote more rapid and more uniform cooking or baking, the apparatus including a motor, fan blade and housing of metallic materials selected from a class of heat resistant materials.

Jorgensen, Jorgen A. (Bloomington, MN); Nygren, Donald W. (Minneapolis, MN)

1983-01-01T23:59:59.000Z

242

Transient Responses of a Coupled Ocean–Atmosphere Model to Gradual Changes of Atmospheric CO2. Part I. Annual Mean Response  

Science Journals Connector (OSTI)

This study investigates the response of a climate model to a gradual increase or decrease of atmospheric carbon dioxide. The model is a general circulation model of the coupled atmosphere-ocean-land surface system with global geography and ...

S. Manabe; R. J. Stouffer; M. J. Spelman; K. Bryan

1991-08-01T23:59:59.000Z

243

Lost circulation in geothermal wells: survey and evaluation of industry experience  

SciTech Connect (OSTI)

Lost circulation during drilling and completion of geothermal wells can be a severe problem, particularly in naturally fractured and/or vugular formations. Geothermal and petroleum operators, drilling service companies, and independent consultants were interviewed to assess the lost circulation problem in geothermal wells and to determine general practices for preventing lost circulation. This report documents the results and conclusions from the interviews and presents recommendations for needed research. In addition, a survey was also made of the lost circulation literature, of currently available lost circulation materials, and of existing lost circulation test equipment.

Goodman, M.A.

1981-07-01T23:59:59.000Z

244

Modelica-A General Object-Oriented Language for Continuous and Discrete-Event System Modeling and Simulation  

Science Journals Connector (OSTI)

Modelica is a general equation-based object-oriented language for continuous and discrete-event modeling of physical systems for the purpose of efficient simulation. The language unifies and generalizes previous object-oriented modeling languages. The ...

Peter Fritzson; Peter Bunus

2002-04-01T23:59:59.000Z

245

General Relativistic Shock Waves that Extend the Oppenheimer-Snyder Model  

E-Print Network [OSTI]

General Relativistic Shock Waves that Extend the Oppenheimer-Snyder Model JOELOEL SMOLLERMOLLER. These shock waves extend the celebrated Oppenheimer-Snyder result to the case of non-zero pressure. Our shock of a Friedmann- Robertson-Walker metric (a cosmological model for the expanding universe) to an Oppenheimer

Temple, Blake

246

A generalized 3D inverted pendulum model to represent human normal walking  

E-Print Network [OSTI]

A generalized 3D inverted pendulum model to represent human normal walking Sophie Sakka IRCCy,lacouture}@univ-poitiers.fr Abstract-- This paper compares different inverted pendulum models to represent the stance phase of human adapted to pathological walking as the walking symmetry hypothesis -needed to build classical inverted

Paris-Sud XI, Université de

247

USING MODEL CHECKING TO DERIVE LOOP BOUNDS OF GENERAL LOOPS WITHIN ANSI-C APPLICATIONS FOR  

E-Print Network [OSTI]

USING MODEL CHECKING TO DERIVE LOOP BOUNDS OF GENERAL LOOPS WITHIN ANSI-C APPLICATIONS for applications written in ANSI-C. The described method uses a model checker and a binary search algorithm with little pro- gramming effort for applications written in ANSI-C. The performance is probably inferior

248

Simulations of the West African Monsoon with a Superparameterized Climate Model. Part I: The Seasonal Cycle  

Science Journals Connector (OSTI)

The West African monsoon seasonal cycle is simulated with two coupled general circulation models: the Community Climate System Model (CCSM), which uses traditional convective parameterizations, and the “superparameterized” CCSM (SP-CCSM), in which ...

Rachel R. McCrary; David A. Randall; Cristiana Stan

2014-11-01T23:59:59.000Z

249

Simulations of the West African Monsoon with a Superparameterized Climate Model. Part II: African Easterly Waves  

Science Journals Connector (OSTI)

The relationship between African easterly waves and convection is examined in two coupled general circulation models: the Community Climate System Model (CCSM) and the “superparameterized” CCSM (SP-CCSM). In the CCSM, the easterly waves are much ...

Rachel R. McCrary; David A. Randall; Cristiana Stan

2014-11-01T23:59:59.000Z

250

The second Hadley Centre coupled ocean-atmosphere GCM: model description, spinup and validation  

Science Journals Connector (OSTI)

...?This study describes a new coupled ocean-atmosphere general circulation model (OAGCM) developed for studies of climate change and results from a hindcast experiment. The model includes various physical and te...

T. C. Johns; R. E. Carnell; J. F. Crossley; J. M. Gregory…

1997-02-01T23:59:59.000Z

251

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

252

Packed bed thermal energy storage model – Generalized approach and experimental validation  

Science Journals Connector (OSTI)

Abstract Packed beds serve as thermal energy storages (TES) and heat exchangers (HEX) in different technological applications. In this paper, a general heterogeneous model of heat transfer in packed beds is developed. It is implemented by lumped element formulation in object-oriented modeling language Modelica and is successful validated with data sets taken from two different experiments reported in literature. The main advantages of the introduced model are the general, theory-based approach and the lumped element formulation in Modelica. The first point mentioned above should allow to simulate a packed bed TES/HEX without the necessity applying measured data for model calibration or to apply specific heat transfer correlations with restricted application. The second point establishes the possibility to integrate the TES/HEX model within plant models of larger scale without increasing the simulation time drastically.

Florian Opitz; Peter Treffinger

2014-01-01T23:59:59.000Z

253

Microsoft Word - 911138_0_SSC-6 Helium Circulator Test Plan_rel...  

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

SERVICES FOR THE NEXT GENERATION NUCLEAR PLANT (NGNP) WITH HYDROGEN PRODUCTION Test Plan for Helium Circulators (PHTS, SCS, SHTS) Prepared by General Atomics For the...

254

The Role of Simple Models in Understanding Climate Change Thomas F. Stocker  

E-Print Network [OSTI]

equations of the Earth System. For example, some 1 #12;aspects of the large-scale ocean circulation are well of processes that are responsible for climate change. The examples of the carbon cycle and the ocean uses general circulation models of the at- mosphere, and the ocean which are then coupled to model

Stocker, Thomas

255

Interacting holographic dark energy model and generalized second law of thermodynamics in non-flat universe  

E-Print Network [OSTI]

In the present paper we consider the interacting holographic model of dark energy to investigate the validity of the generalized second laws of thermodynamics in non-flat (closed) universe enclosed by the event horizon measured from the sphere of the horizon named $L$. We show that for $L$ as the system's IR cut-off the generalized second law is respected for the special range of the deceleration parameter.

M. R. Setare

2007-01-26T23:59:59.000Z

256

Numerical Simulation of a Natural Circulation Steam Generator  

E-Print Network [OSTI]

Numerical Simulation of a Natural Circulation Steam Generator W. Linzer \\Lambda , K. Ponweiser circulation steam generator. We focus on a model with a simple geometry consisting of two vertical pipes properties of water and steam. We present a numerical algorithm based on an explicit upwind discretization

Weinmüller, Ewa B.

257

A general numerical solution of dispersion relations for the nuclear optical model  

E-Print Network [OSTI]

A general numerical solution of the dispersion integral relation between the real and the imaginary parts of the nuclear optical potential is presented. Fast convergence is achieved by means of the Gauss-Legendre integration method, which offers accuracy, easiness of implementation and generality for dispersive optical model calculations. The use of this numerical integration method in the optical-model parameter search codes allows for a fast and accurate dispersive analysis. PACS number(s): 11.55.Fv, 24.10.Ht, 02.60.Jh

Roberto Capote; Alberto Molina; Jose Manuel Quesada

2001-05-09T23:59:59.000Z

258

Amazon Deforestation and Climate Change in a Coupled Model Simulation  

Science Journals Connector (OSTI)

The effects of Amazon deforestation on climate change are investigated using twin numerical experiments of an atmospheric general circulation model (AGCM) with prescribed global sea surface temperature and the same AGCM coupled to an ocean GCM (...

Paulo Nobre; Marta Malagutti; Domingos F. Urbano; Roberto A. F. de Almeida; Emanuel Giarolla

2009-11-01T23:59:59.000Z

259

Matter Power Spectrum for the Generalized Chaplygin Gas Model: The Newtonian Approach  

E-Print Network [OSTI]

We model the cosmic medium as the mixture of a generalized Chaplygin gas and a pressureless matter component. Within a neo-Newtonian approach (in which, different from standard Newtonian cosmology, the pressure enters the homogeneous and isotropic background dynamics) we compute the matter power spectrum. The 2dFGRS data are used to discriminate between unified models of the dark sector (a purely baryonic matter component of roughly 5 percent of the total energy content and roughly 95 percent generalized Chaplygin gas) and different models, for which there is separate dark matter, in addition to that accounted for by the generalized Chaplygin gas. Leaving the corresponding density parameters free, we find that the unified models are strongly disfavored. On the other hand, using unified model priors, the observational data are also well described, in particular for small and large values of the generalized Chaplygin gas parameter $\\alpha$. The latter result is in agreement with a recent, more qualitative but fully relativistic, perturbation analysis in Gorini et al.

J. C. Fabris; S. V. B. Goncalves; H. E. S. Velten; W. Zimdahl

2008-10-23T23:59:59.000Z

260

A general model for chemical erosion of carbon materials due to low-energy H + impact  

Science Journals Connector (OSTI)

Modeling the chemical erosion of carbon materials due to low-energy H + impact is of paramount importance for the prediction of the behavior of carbon-based plasma-facing components in nuclear fusion devices. In this paper a simple general model describing both energy and temperature dependence of carbon-based chemical erosion is presented. Enlightened by Hopf’s model {Hopf et al. [J. Appl. Phys.94 2373 (Year: 2003)} the chemical erosion is separated into the contributions from three mechanisms: thermal chemical erosion energetic chemical sputtering and ion-enhanced chemical erosion. Using input from the Monte Carlo code TRIDYN this model is able to reproduce experimental data well.

Shengguang Liu; Jizhong Sun; Shuyu Dai; Thomas Stirner; Dezhen Wang

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "general circulation models" 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

Reconstructing generalized ghost condensate model with dynamical dark energy parametrizations and observational datasets  

E-Print Network [OSTI]

Observations of high-redshift supernovae indicate that the universe is accelerating at the present stage, and we refer to the cause for this cosmic acceleration as ``dark energy''. In particular, the analysis of current data of type Ia supernovae (SNIa), cosmic large-scale structure (LSS), and the cosmic microwave background (CMB) anisotropy implies that, with some possibility, the equation-of-state parameter of dark energy may cross the cosmological-constant boundary ($w=-1$) during the recent evolution stage. The model of ``quintom'' has been proposed to describe this $w=-1$ crossing behavior for dark energy. As a single-real-scalar-field model of dark energy, the generalized ghost condensate model provides us with a successful mechanism for realizing the quintom-like behavior. In this paper, we reconstruct the generalized ghost condensate model in the light of three forms of parametrization for dynamical dark energy, with the best-fit results of up-to-date observational data.

Jingfei Zhang; Xin Zhang; Hongya Liu

2007-03-21T23:59:59.000Z

262

A general stochastic model for sporophytic self-incompatibility Sylvain Billiard  

E-Print Network [OSTI]

A general stochastic model for sporophytic self-incompatibility Sylvain Billiard and Viet Chi Tran. Here, we investigate the impact of self-incompatibility in flowering plants, where several inter to self-fertile species with and without inbreeding depression, to obtain the conditions under which self-incompatible

Paris-Sud XI, Université de

263

The Lattice Boltzmann Method as a General Framework for Blood Flow Modelling  

E-Print Network [OSTI]

Chapter 10 The Lattice Boltzmann Method as a General Framework for Blood Flow Modelling with the Lattice Boltzmann method and the underlying Cartesian mesh. The methodology allows to accommodate red, the Lattice Boltzmann framework has become a reality for studying sections of the human circulatory system

Pontrelli, Giuseppe

264

Dynamics of Earth's Hadley circulation.  

E-Print Network [OSTI]

?? This thesis advances our understanding of the mechanisms controlling the Hadley circulation, and its interaction with eddies on planetary scales in particular. On Earth,… (more)

Levine, Xavier Josselin

2013-01-01T23:59:59.000Z

265

Generalized Jackiw-Rebbi Model and Topological Classification of Free Fermion Insulators  

E-Print Network [OSTI]

We present a new perspective to the classification of topological phases in free fermion insulators by generalizing the Jackiw-Rebbi model to arbitrary dimensions. We show that a generalized Jackiw-Rebbi model where the Dirac mass ($m$) satisfies $m(x)=-m(-x)$ is invariant under a parity transformation ($P$) that relates the $x>0$ half to the $xinsulators. Gapless edge states are a natural consequence of our construction and their topological nature can be understood from the fact that all gapless edge states at a given interface transform similarly under $P$ (all odd or all even). A naive non-topological model for states confined to the interface will allow both even and odd states.

O. Nganba Meetei; Archana Anandakrishnan

2014-06-02T23:59:59.000Z

266

Solitons and black holes in a generalized Skyrme model with dilaton-quarkonium field  

SciTech Connect (OSTI)

Skyrme theory is among the viable effective theories which emerge from the low-energy limit of quantum chromodynamics. Many of its generalizations include also a dilaton. Here we find new self-gravitating solutions, both solitons and black holes, in a generalized Skyrme model in which a dilaton is present. The investigation of the properties of the solutions is done numerically. We find that the introduction of the dilaton in the theory does not change the picture qualitatively, only quantitatively. The model considered here has one free parameter more than the Einstein-Skyrme model which comes from the potential of the dilaton. We have applied also the turning point method to establish that one of the black-hole branches of solutions is unstable. The turning point method here is based on the first law of black-hole thermodynamics a detailed derivation of which is given in the Appendix of the paper.

Doneva, Daniela D. [Deptartment of Astronomy, Faculty of Physics, St. Kliment Ohridski University of Sofia, 5, James Bourchier Blvd., 1164 Sofia (Bulgaria); Theoretical Astrophysics, Eberhard-Karls University of Tuebingen, Tuebingen 72076 (Germany); Stefanov, Ivan Zh. [Department of Applied Physics, Technical University of Sofia, 8, Kliment Ohridski Blvd., 1000 Sofia (Bulgaria); Yazadjiev, Stoytcho S. [Department of Theoretical Physics, Faculty of Physics, St. Kliment Ohridski University of Sofia, 5, James Bourchier Blvd., 1164 Sofia (Bulgaria)

2011-06-15T23:59:59.000Z

267

Constraints on general second-order scalar-tensor models from gravitational Cherenkov radiation  

SciTech Connect (OSTI)

We demonstrate that the general second-order scalar-tensor theories, which have attracted attention as possible modified gravity models to explain the late time cosmic acceleration, could be strongly constrained from the argument of the gravitational Cherenkov radiation. To this end, we consider the purely kinetic coupled gravity and the extended galileon model on a cosmological background. In these models, the propagation speed of tensor mode could be less than the speed of light, which puts very strong constraints from the gravitational Cherenkov radiation.

Kimura, Rampei; Yamamoto, Kazuhiro, E-mail: rampei@theo.phys.sci.hiroshima-u.ac.jp, E-mail: kazuhiro@hiroshima-u.ac.jp [Department of Physical Science, Hiroshima University, Higashi-Hiroshima 739-8526 (Japan)

2012-07-01T23:59:59.000Z

268

The Climatology and Interannual Variability of East Asian Summer Monsoon in CMIP5 Coupled Models: Does Air–Sea Coupling Improve the Simulations?  

Science Journals Connector (OSTI)

The climatology and interannual variability of the East Asian summer monsoon (EASM) simulated by 34 coupled general circulation models (CGCMs) from phase 5 of the Coupled Model Intercomparison Project (CMIP5) are evaluated. To estimate the role of ...

Fengfei Song; Tianjun Zhou

2014-12-01T23:59:59.000Z

269

Solution of lattice gas models in the generalized ensemble on the Bethe lattice Emilia La Nave,1,2  

E-Print Network [OSTI]

Solution of lattice gas models in the generalized ensemble on the Bethe lattice Emilia La Nave,1 for a lattice gas Potts model defined in the generalized ensemble which was previously studied in elucidating, such as geometric aspects via percolation. In this paper, we consider a lattice gas Potts model stud- ied previously

Sciortino, Francesco

270

The atmospheric response to a THC collapse: Scaling relations for the Hadley circulation  

E-Print Network [OSTI]

The atmospheric response to a THC collapse: Scaling relations for the Hadley circulation Atlantic Global #12;Schematic illustration of the Hadley circulation in boreal winter #12;Anomalous energy and mass transport #12;The Held-Hou model for the Hadley circulation · The flow is thermally driven

Drijfhout, Sybren

271

Simulation of Summer Diurnal Circulations over the Northwest United States  

Science Journals Connector (OSTI)

During the summer, strong surface heating combines with the terrain and land–water contrasts of the northwest United States to create a complex array of diurnal circulations. Though observational and modeling studies have described some of these ...

Matthew C. Brewer; Clifford F. Mass

2014-10-01T23:59:59.000Z

272

Geostrophic and Ageostrophic Circulations in Midlatitude Squall Lines  

Science Journals Connector (OSTI)

The Eliassen transverse circulation equation is derived from the set of f-plane, semigeostrophic, slab-symmetric equations with the inclusion of both diabatic heating and ambient shear effects. Numerical integrations of this model in geostrophic ...

Chungu Lu; Paul E. Ciesielski; Wayne H. Schubert

1997-05-01T23:59:59.000Z

273

The Hadley Circulation and the Weak Temperature Gradient Approximation  

Science Journals Connector (OSTI)

The weak temperature gradient (WTG) approximation is applied to simple shallow-water models of the Hadley circulation. While it is difficult to formally justify the use of the WTG approximation for this problem, the derived WTG solutions are ...

L. M. Polvani; A. H. Sobel

2002-05-01T23:59:59.000Z

274

Hadley circulations and Kelvin wave-driven equatorial jets in the atmospheres of Jupiter and Saturn  

Science Journals Connector (OSTI)

We propose a dynamical mechanism that can plausibly explain the origin of the broad prograde equatorial winds observed on Jupiter and Saturn, and examine the feasibility of this mechanism using two- (2D) and three-dimensional (3D) numerical simulation models. The idea is based on combining a narrow Gaussian jet peaking at the equator, which is induced by the momentum transfer from an upward propagating equatorial Kelvin-wave, and a pair of off-equatorial jets due to a meridional-vertical circulation similar to the tropical Hadley circulation on Earth. We employ for this feasibility study a 2D mechanistic mean-flow model which incorporates the influence of prescribed waves, and a 3D general circulation model, based on the generalised primitive equations of atmospheric motion. We then confirm that the dynamical models of both kinds can successfully reproduce theoretically expected flows of a reasonable magnitude, and that when two mechanisms are combined, a broad super-rotating jet is produced with off-equatorial maxima in zonal velocity for both Jupiter and Saturn, approximately in accordance with observations.

Y.H. Yamazaki; P.L. Read; D.R. Skeet

2005-01-01T23:59:59.000Z

275

Transient Response of the Hadley Centre Coupled Ocean-Atmosphere Model to Increasing Carbon Dioxide. Part III: Analysis of Global-Mean Response Using Simple Models  

Science Journals Connector (OSTI)

The roles of surface, atmospheric, and oceanic feedbacks in controlling the global-mean transient response of a coupled ocean-atmosphere general circulation model to increasing carbon dioxide are investigated. The analysis employs a four-box ...

J. M. Murphy

1995-03-01T23:59:59.000Z

276

Local rules for protein folding on a triangular lattice and generalized hydrophobicity in the HP model  

SciTech Connect (OSTI)

We consider the problem of determining the three-dimensional folding of a protein given its one-dimensional amino acid sequence. We use the HP model for protein folding proposed by Dill, which models protein as a chain of amino acid residues that are either hydrophobic or polar, and hydrophobic interactions are the dominant initial driving force for the protein folding. Hart and Istrail gave approximation algorithms for folding proteins on the cubic lattice under HP model. In this paper, we examine the choice of a lattice by considering its algorithmic and geometric implications and argue that triangular lattice is a more reasonable choice. We present a set of folding rules for a triangular lattice and analyze the approximation ratio which they achieve. In addition, we introduce a generalization of the HP model to account for residues having different levels of hydrophobicity. After describing the biological foundation for this generalization, we show that in the new model we are able to achieve similar constant factor approximation guarantees on the triangular lattice as were achieved in the standard HP model. While the structures derived from our folding rules are probably still far from biological reality, we hope that having a set of folding rules with different properties will yield more interesting folds when combined.

Agarwala, R. [National Institutes of Health, Bethesda, MD (United States); Batzoglou, S. [MIT, Cambridge, MA (United States); Dancik, V. [Univ. of Southern California, Los Angeles, CA (United States)] [and others

1997-06-01T23:59:59.000Z

277

Thermohaline Circulation Lynne D Talley  

E-Print Network [OSTI]

currents. The convective source regions and ocean basins are connected through deep western boundary cur of the upper 2000 m of the ocean are about 10 times faster, reaching 1 m s 1 in bound- ary currents and about 0, Ltd, Chichester, 2002 #12;Thermohaline Circulation Thermohaline circulation is the part of the ocean

Talley, Lynne D.

278

Model Parameterization, Prior Distributions, and the General Time-Reversible Model in Bayesian Phylogenetics  

E-Print Network [OSTI]

Bayesian phylogenetic methods require the selection of prior probability distributions for all parameters of the model of evolution. These distributions allow one to incorporate prior information into a Bayesian analysis, ...

Zwickl, Derrick J.; Holder, Mark T.

2004-01-01T23:59:59.000Z

279

Generalizing thawing dark energy models: the standard vis-à-vis model independent diagnostics  

Science Journals Connector (OSTI)

......w X for thawing dark energy models which include...Oscillation Spectroscopic Survey data. Our analysis...type of thawing dark energy is favoured up...Oscillation Spectroscopic Survey (BOSS) data...fluid, namely dark energy, in huge abundances......

Debabrata Adak; Debasish Majumdar; Supratik Pal

2014-01-01T23:59:59.000Z

280

Integrated hydrogeological model of the general separations area. Volume 2: groundwater flow model  

SciTech Connect (OSTI)

This report models the Gordon aquifer, the Gordon confining unit, and the `lower` aquifer zone, `tan clay` confining zone, and `upper` aquifer zone of the Water Table aquifer. The report presents structure-contour and isopach maps of each unit.

Flach, G.P.; Harris, M.K.

1997-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "general circulation models" 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

Generalized Elastic Model: thermal vs non-thermal initial conditions. Universal scaling, roughening, ageing and ergodicity  

E-Print Network [OSTI]

We study correlation properties of the generalized elastic model which accounts for the dynamics of polymers, membranes, surfaces and fluctuating interfaces, among others. We develop a theoretical framework which leads to the emergence of universal scaling laws for systems starting from thermal (equilibrium) or non-thermal (non-equilibrium) initial conditions. Our analysis incorporates and broadens previous results such as observables' double scaling regimes, (super)roughening and anomalous diffusion, and furnishes a new scaling behavior for correlation functions at small times (long distances). We discuss ageing and ergodic properties of the generalized elastic model in non-equilibrium conditions, providing a comparison with the situation occurring in continuous time random walk. Our analysis also allows to assess which observable is able to distinguish whether the system is in or far from equilibrium conditions in an experimental set-up.

Taloni, Alessandro; Klafter, Joseph; 10.1209/0295-5075/97/30001

2012-01-01T23:59:59.000Z

282

The Promise of Load Balancing the Parameterization of Moist Convection Using a Model Data Load Index  

Science Journals Connector (OSTI)

The parameterization of physical processes in atmospheric general circulation models contributes to load imbalances among individual processors of message-passing distributed-multiprocessor systems. Load imbalances increase the overall time to ...

S. P. Muszala; D. A. Connors; J. J. Hack; G. Alaghband

2006-04-01T23:59:59.000Z

283

The New Hadley Centre Climate Model (HadGEM1): Evaluation of Coupled Simulations  

Science Journals Connector (OSTI)

A new coupled general circulation climate model developed at the Met Office's Hadley Centre is presented, and aspects of its performance in climate simulations run for the Intergovernmental Panel on Climate Change Fourth Assessment Report (IPCC ...

T. C. Johns; C. F. Durman; H. T. Banks; M. J. Roberts; A. J. McLaren; J. K. Ridley; C. A. Senior; K. D. Williams; A. Jones; G. J. Rickard; S. Cusack; W. J. Ingram; M. Crucifix; D. M. H. Sexton; M. M. Joshi; B.-W. Dong; H. Spencer; R. S. R. Hill; J. M. Gregory; A. B. Keen; A. K. Pardaens; J. A. Lowe; A. Bodas-Salcedo; S. Stark; Y. Searl

2006-04-01T23:59:59.000Z

284

Understanding Hadley Cell Expansion versus Contraction: Insights from Simplified Models and Implications for Recent Observations  

Science Journals Connector (OSTI)

This study seeks a deeper understanding of the causes of Hadley Cell (HC) expansion, as projected under global warming, and HC contraction, as observed under El Niño. Using an idealized general circulation model, the authors show that a thermal ...

Neil F. Tandon; Edwin P. Gerber; Adam H. Sobel; Lorenzo M. Polvani

2013-06-01T23:59:59.000Z

285

Precipitation over South America during the Last Glacial Maximum: An analysis of the "amount effect" with a water isotope-enabled general circulation model  

E-Print Network [OSTI]

Precipitation over South America during the Last GlacialPrecipitation over South America during the Last Glacialand subtropical regions of South America also suggest

Lee, Jung-Eun; Johnson, Kathleen; Fung, Inez

2009-01-01T23:59:59.000Z

286

Factorial tests on process operating conditions and bed fines on the circulating fluid bed performance  

SciTech Connect (OSTI)

A cold-flow circulating fluid bed (CFB) was operated using coke breeze with a packed-bed standpipe over a range of riser and standpipe air flows. The bed materials were selected to simulate solids flow in a CFB gasifier (carbonizer) but are generally relevant to most CFB processes. CFB tests were conducted primarily in the transport mode with sufficient gas velocity to achieve a uniform axial riser pressure profiles over most of the riser height. The independent variables tested included the riser gas velocity, aeration at the base of the standpipe, and concentration of fines (average particle size). The solids inventory and riser outlet pressure were maintained constant. Factorial tests were conducted in randomized order and in duplicate to provide and an unbiased estimate of the error. Fines were tested as a blocked variable. The gas velocity, standpipe aeration, and relative amount of fine particles were all found to be significant factors affecting both the riser solids holdup and solids flux. The riser pressure drop and mass circulation increased at the higher level of fines contrary to some earlier reports in the literature. The riser pressure drop was fitted using the general linear model (GLM), which explained more than 98% of the variation within the data, while a GLM for the mass circulation rate explained over 90%. The uncertainty of process operating variables was characterized independently through a series of duplicated flow proving experiments.

Shadle, L.J.; Spenik, James; Sarra, Angela; Ontko, J.S.

2004-07-21T23:59:59.000Z

287

Deterministic and stochastic state model of right generalized cylinder (RGC-sm): application in computer phantoms synthesis  

Science Journals Connector (OSTI)

RGC-sm is a state model proposed to describe complex-shaped objects within the family of right generalized cylinders (RGCs). A continuous deformation of a planar curve (contour) along the object's axis describes its surface. The contour, locally orthogonal ... Keywords: 3D image analysis, blood vessel, generalized cylinder, phantom synthesis, segmentation, state model

Jacques Azencot; Maciej Orkisz

2003-11-01T23:59:59.000Z

288

Z3 generalization of the Kitaev's spin-1/2 model  

Science Journals Connector (OSTI)

We generalize the Kitaev's spin-1/2 model on the honeycomb by introducing a two-dimensional Z3 clock model on the triangular lattice with three-body interaction. We discuss various properties of this model and show that the low energy theory of the Z3 generalized Kitaev model (GKM) is described by a single Z3 parafermion per lattice site coupled to a Z3 gauge field. We also introduce a slave-fermion approach for this GKM, treat the resulting fermionic Hamiltonian at the mean-field level, solve the mean-field parameters self-consistently, and obtain the low energy effective Chern-Simons (CS) gauge theory. The resulting CS gauge theory is identical to that of a (221) fractional quantum Hall state. We then go beyond the mean-field approximation and demonstrate that fluctuations generate a uniform interlayer pairing for the dual (221) bilayer state. We argue that this perturbed system can undergo a phase transition to the Fibonacci phase by tuning the interlayer pairing strength.

Abolhassan Vaezi

2014-08-06T23:59:59.000Z

289

Dynamics and energy balance of the Hadly circulation and the tropical precipitation zones: Significance of the distribution of evaporation  

SciTech Connect (OSTI)

A series of numerical experiments is performed using a general circulation model with an idealistic ocean-covered boundary condition. The meridional structure of the Hadley circulation system, which is a combined structure of the Hadley circulation and the tropical precipitation zone, is examined from the standpoints of the water vapor and the energy budgets. Although the prescribed SST distribution has a broad peak centered at the equator, the distribution of the precipitation has two peaks straddling the equator. The distribution of the evaporation rate is an important factor in the formation of this structure. The evaporation rate is smaller near the equator than in the subtropics because of its dependence upon the wind speed. If this dependence is removed, the latitudinal distribution of evaporation becomes flat and the precipitation concentrates at the equator to form a single band structure. Qualitatively similar results are obtained in experiments with an axisymmetric two-dimensional model without the effect of disturbances. The net supply of the moist static energy must balance with the divergence of the meridional transport of moist static energy. A small fractional change in the evaporation rate causes a large change in the net energy supply and thus results in a strong modification of the meridional structure of the system. A strong positive feedback between the strength of the Hadley circulation and the latitudinal concentration of the precipitation provides the high sensitivity of the Hadley circulation system to the distribution of the evaporation, which is the principal energy source of the system. A set of comparative experiments with different cumulus parameterization schemes is performed. It is shown that the difference in the vertical stratification significantly modifies the energy budget of the Hadley circulation system and causes a large difference in the distribution of precipitation. 27 refs., 21 figs.

Numaguti, A. (National Institute for Environmental Studies, Tsukuba, Ibaraki (Japan))

1993-07-01T23:59:59.000Z

290

Matter power spectrum for the generalized Chaplygin gas model: The relativistic case  

E-Print Network [OSTI]

The generalized Chaplygin gas (GCG) model is the prototype of a unified model of dark energy (DE) and dark matter (DM). It is characterized by equation-of-state (EoS) parameters $A$ and $\\alpha$. We use a statistical analysis of the 2dFGRS data to constrain these parameters. In particular, we find that very small (close to zero) and very large values ($\\alpha\\gg 1$) of the equation-of-state parameter $\\alpha$ are preferred. To test the validity of this type of unification of the dark sector we admit the existence of a separate DM component in addition to the Chaplygin gas and calculate the probability distribution for the fractional contributions of both components to the total energy density. This analysis favors a model for which the Universe is nearly entirely made up of the separate DM component with an almost negligible Chaplygin gas part. This confirms the results of a previous Newtonian analysis.

J. C. Fabris; H. E. S. Velten; W. Zimdahl

2010-01-22T23:59:59.000Z

291

3-D seismic modelling of general material anisotropy in the presence of the free surface by a Chebyshev spectral method  

Science Journals Connector (OSTI)

......modelling in general anisotropic media is presented...the qSV and SH waves. Anisotropic free-surface modelling...wavefronts of Green River shale after 375 ms propagation...in the Green River shale model with 45" inclined...qSH-guided SH wave. Anisotropic free-surface modelling......

Ekkehart Tessmer

1995-05-01T23:59:59.000Z

292

Effect of the Hadley Circulation on the Reflection of Planetary Waves in Three-Dimensional Tropospheric Flows  

Science Journals Connector (OSTI)

The nonlinear behavior of quasi-stationary planetary waves excited by midlatitude orographic forcing is considered in a three-dimensional primitive equation model that includes a representation of the Hadley circulation. The Hadley circulation is ...

Christopher C. Walker; Gudrun Magnusdottir

2002-10-01T23:59:59.000Z

293

Generalized spherically symmetric gravitational model: Hamiltonian dynamics in extended phase space and BRST charge  

E-Print Network [OSTI]

We construct Hamiltonian dynamics of the generalized spherically symmetric gravitational model in extended phase space. We start from the Faddeev - Popov effective action with gauge-fixing and ghost terms, making use of gauge conditions in differential form. It enables us to introduce missing velocities into the Lagrangian and then construct a Hamiltonian function according a usual rule which is applied for systems without constraints. The main feature of Hamiltonian dynamics in extended phase space is that it can be proved to be completely equivalent to Lagrangian dynamics derived from the effective action. We find a BRST invariant form of the effective action by adding terms not affecting Lagrangian equations. After all, we construct the BRST charge according to the Noether theorem. Our algorithm differs from that by Batalin, Fradkin and Vilkovisky, but the resulting BRST charge generates correct transformations for all gravitational degrees of freedom including gauge ones. Generalized spherically symmetric model imitates the full gravitational theory much better then models with finite number of degrees of freedom, so that one can expect appropriate results in the case of the full theory.

T. P. Shestakova

2014-06-12T23:59:59.000Z

294

Phase shift method to estimate solids circulation rate in circulating fluidized beds  

SciTech Connect (OSTI)

While solids circulation rate is a critical design and control parameter in circulating fluidized bed (CFB) reactor systems, there are no available techniques to measure it directly at conditions of industrial interest. Cold flow tests have been conducted at NETL in an industrial scale CFB unit where the solids flow has been the topic of research in order to develop an independent method which could be applied to CFBs operating under the erosive and corrosive high temperatures and pressures of a coal fired boiler or gasifier. The dynamic responses of the CFB loop to modest modulated aeration flows in the return leg or standpipe were imposed to establish a periodic response in the unit without causing upset in the process performance. The resulting periodic behavior could then be analyzed with a dynamic model and the average solids circulation rate could be established. This method was applied to the CFB unit operated under a wide range of operating conditions including fast fluidization, core annular flow, dilute and dense transport, and dense suspension upflow. In addition, the system was operated in both low and high total solids inventories to explore the influence of inventory limiting cases on the estimated results. The technique was able to estimate the solids circulation rate for all transport circulating fluidized beds when operating above upper transport velocity, U{sub tr2}. For CFB operating in the fast fluidized bed regime (i.e., U{sub g}< U{sub tr2}), the phase shift technique was not successful. The riser pressure drop becomes independent of the solids circulation rate and the mass flow rate out of the riser does not show modulated behavior even when the riser pressure drop does.

Ludlow, James Christopher [U.S. DOE (retired); Panday, Rupen [REM; Shadle, Lawrence J. [U.S. DOE

2013-01-01T23:59:59.000Z

295

Groundwater flow model for the General Separations Area, Savannah River Site  

SciTech Connect (OSTI)

The Savannah River Site (SRS) is a Department of Energy (DOE) facility located near Aiken, South Carolina. Assessment of groundwater flow rates and directions, potential contaminant transport times, and concentration of potential contaminants is required to determine current and future environmental effects resulting from releases by these facilities. Proposed closure actions and/or remedial alternatives also need to be evaluated. Numerical groundwater flow and solute transport models are a means of assessing the environmental effects on the groundwater system. They provide a logical method of integrating all available data into a consistent framework for quantitative analysis. The results of groundwater models can be used directly for input to management decisions and design/construct issues or can provide input into risk assessment models for site evaluations. GeoTrans, Inc. was contracted by the Environmental Restoration Department of WSRC to develop a groundwater model of the entire General Separations Area (GSA). Of particular interest is the area surrounding the Mixed Waste Management Facility (MWMF) as shown in Figure 1.2. The model developed in this phase of the study will be used to assess groundwater flow issues for the entire GSA. The second phase of the study will address contaminant transport issues specific to the area surrounding the MWMF.

Not Available

1992-05-15T23:59:59.000Z

296

Generalized Chaplygin gas model: constraints from Hubble parameter versus Redshift Data  

E-Print Network [OSTI]

We examine observational constraints on the generalized Chaplygin gas (GCG) model for dark energy from the 9 Hubble parameter data points, the 115 SNLS Sne Ia data and the size of baryonic acoustic oscillation peak at redshift, $z=0.35$. At a 95.4% confidence level, a combination of three data sets gives $0.67\\leq A_s\\leq 0.83$ and $-0.21\\leq \\alpha\\leq 0.42$, which is within the allowed parameters ranges of the GCG as a candidate of the unified dark matter and dark energy. It is found that the standard Chaplygin gas model ($\\alpha=1$) is ruled out by these data at the 99.7% confidence level.

Puxun Wu; Hongwei Yu

2006-12-09T23:59:59.000Z

297

Dilute gas of ultracold two-level atoms inside a cavity; generalized Dicke model  

E-Print Network [OSTI]

We consider a gas of ultracold two-level atoms confined in a cavity, taking into account for atomic center-of-mass motion and cavity mode variations. We use the generalized Dicke model, and analyze separately the cases of a Gaussian, and a standing wave mode shape. Owing to the interplay between external motional energies of the atoms and internal atomic and field energies, the phase-diagrams exhibit novel features not encountered in the standard Dicke model, such as the existence of first and second order phase transitions between normal and superradiant phases. Due to the quantum description of atomic motion, internal and external atomic degrees of freedom are highly correlated leading to modified normal and superradiant phases.

Jonas Larson; Maciej Lewenstein

2009-02-06T23:59:59.000Z

298

Generalized CP symmetries and special regions of parameter space in the two-Higgs-doublet model  

SciTech Connect (OSTI)

We consider the impact of imposing generalized CP symmetries on the Higgs sector of the two-Higgs-doublet model, and identify three classes of symmetries. Two of these classes constrain the scalar potential parameters to an exceptional region of parameter space, which respects either a Z{sub 2} discrete flavor symmetry or a U(1) symmetry. We exhibit a basis-invariant quantity that distinguishes between these two possible symmetries. We also show that the consequences of imposing these two classes of CP symmetry can be achieved by combining Higgs family symmetries, and that this is not possible for the usual CP symmetry. We comment on the vacuum structure and on renormalization in the presence of these symmetries. Finally, we demonstrate that the standard CP symmetry can be used to build all the models we identify, including those based on Higgs family symmetries.

Ferreira, P. M. [Instituto Superior de Engenharia de Lisboa, Rua Conselheiro Emidio Navarro, 1900 Lisboa (Portugal); Centro de Fisica Teorica e Computacional, Faculdade de Ciencias, Universidade de Lisboa, Av. Prof. Gama Pinto 2, 1649-003 Lisboa (Portugal); Haber, Howard E. [Santa Cruz Institute for Particle Physics, University of California, Santa Cruz, California 95064 (United States); Silva, Joao P. [Instituto Superior de Engenharia de Lisboa, Rua Conselheiro Emidio Navarro, 1900 Lisboa (Portugal); Centro de Fisica Teorica de Particulas, Instituto Superior Tecnico, P-1049-001 Lisboa (Portugal)

2009-06-01T23:59:59.000Z

299

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

300

Degeneracies and scaling relations in general power-law models for gravitational lenses  

E-Print Network [OSTI]

The time delay in gravitational lenses can be used to derive the Hubble constant in a relatively simple way. The results of this method are less dependent on astrophysical assumptions than in many other methods. The most important uncertainty is related to the mass model used. We discuss a family of models with a separable radial power-law and an arbitrary angular dependence for the potential psi = r^beta * F(theta). Isothermal potentials are a special case of these models with beta=1. An additional external shear is used to take into account perturbations from other galaxies. Using a simple linear formalism for quadruple lenses, we can derive H0 as a function of the observables and the shear. If the latter is fixed, the result depends on the assumed power-law exponent according to H0 proportional to (2-beta)/beta. The effect of external shear is quantified by introducing a `critical shear' gamma_c as a measure for the amount of shear that changes the result significantly. The analysis shows, that in the general case H0 and gamma_c do not depend on the position of the lens galaxy. We discuss these results and compare with numerical models for a number of real lens systems.

Olaf Wucknitz

2002-02-20T23:59:59.000Z

Note: This page contains sample records for the topic "general circulation models" from the National Library of EnergyBeta (NLEBeta).
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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

PHYSICAL REVIEW E 85, 036704 (2012) Generalized Monte Carlo loop algorithm for two-dimensional frustrated Ising models  

E-Print Network [OSTI]

-dimensional frustrated Ising models Yuan Wang and Hans De Sterck Department of Applied Mathematics, University a generalized loop move (GLM) update for Monte Carlo simulations of frustrated Ising models on two implementation on several frustrated Ising models, we demonstrate the effectiveness of the GLM updates in cases

De Sterck, Hans

302

Numerical study of the global axisymmetric circulation with varying heating and rotation rates  

SciTech Connect (OSTI)

A steady, axisymmetric model of the general circulation is developed as a basis for climate stability studies. The model includes the effects of heating, rotation, and internal friction, but neglects topography. It is assumed that the axisymmetric flow may be modeled by making the Boussinesq and deep convection approximations. The three unknowns are assumed to satisfy appropriate spectral expansions, and the three equations are then rearranged into a Galerkin representation. The number of degrees of freedom retained in the expansions is restricted to eight waves or less, which places the model in the class of highly truncated spectral models. The motions are forced by a specified heating distribution and dissipated through an eddy mixing coefficient formulation. The axisymmetric circulation is tested for stability to quasi-geostrophic disturbances. The orignial set of five primitive equations is reduced to a single equation governing the evolution of quasi-geostrophic potential vorticity. This equation is linearized about the axisymmetric state, and the stability of the disturbances is found by examining the eigenvalues associated with each disturbance. The application of the Boussinesq, deep convection, and quasi-geostrophic assumptions limits the ranges of the heating and rotation rates. For values not too far from typical atmospheric values, the model produces a stability boundary separating Rossby and Hadley flow.

Henderson, H.W.

1982-01-01T23:59:59.000Z

303

One-skeleton galleries, the path model and a generalization of Macdonald's formula for Hall-Littlewood polynomials  

E-Print Network [OSTI]

One-skeleton galleries, the path model and a generalization of Macdonald's formula for Hall to Macdonald's formula. Contents 1 Introduction 2 2 Preliminaries 5 2.1 Schubert varieties in the affine and the associated Weyl group combinatorics [20]. As a consequence, we get a generalization of Macdonald's formula

Boyer, Edmond

304

CERFACS: Scientific Report ``Climate Modelling & Global Change'' Project  

E-Print Network [OSTI]

CERFACS: Scientific Report ``Climate Modelling & Global Change'' Project 1991 ­ 1992 November 1992 #12; 1 INTRODUCTION (O. Thual) The goals of the Climate Modelling & Global Change project of climate experiments with this general circulation model. The Climate Modelling & Global Change project has

305

TROPICAL METEOROLOGY & Climate | Hadley Circulation  

Science Journals Connector (OSTI)

Synopsis The Hadley circulation, a prominent circulation feature characterized by rising air near the Equator and sinking air in the subtropics, defines the position of dry subtropical areas and is a fundamental regulator of the earth's energy and momentum budgets. The character of the Hadley circulation, and its related precipitation regimes, exhibits variation and change in response to both climate variability and radiative forcing changes. The strength and position of the Hadley circulation change from year to year paced by El Niño and La Niña events. Over the last few decades of the twentieth century, the Hadley cell has expanded poleward in both hemispheres, with changes in atmospheric composition (including stratospheric ozone depletion and greenhouse gas increases) thought to have contributed to its expansion. This article introduces the basic phenomenology and driving mechanism of the Hadley circulation and discusses its variations under both natural and anthropogenic climate forcings. This article is a revision of the previous edition article by I N James, volume 3, pp 919–924, © 2003, Elsevier Ltd.

J. Lu; G.A. Vecchi

2015-01-01T23:59:59.000Z

306

Sensitivity of the Simulated Distributions of Water Masses, CFCs, and Bomb 14C to Parameterizations of Mesoscale Tracer Transports in a Model of the North Pacific  

Science Journals Connector (OSTI)

A basinwide ocean general circulation model of the North Pacific Ocean is used to study the sensitivity of the simulated distributions of water masses, chlorofluorocarbons (CFCs), and bomb carbon-14 isotope (14C) to parameterizations of mesoscale ...

Yongfu Xu; Shigeaki Aoki; Koh Harada

2006-03-01T23:59:59.000Z

307

Transient Response of the Hadley Centre Coupled Ocean-Atmosphere Model to Increasing Carbon Dioxide. Part 1: Control Climate and Flux Adjustment  

Science Journals Connector (OSTI)

This paper describes the initialization of an experiment to study the time-dependent response of a high-resolution global coupled ocean-atmosphere general circulation model to a gradual increase in carbon dioxide. The stability of the control ...

J. M. Murphy

1995-01-01T23:59:59.000Z

308

The Dynamical Core, Physical Parameterizations, and Basic Simulation Characteristics of the Atmospheric Component AM3 of the GFDL Global Coupled Model CM3  

Science Journals Connector (OSTI)

The Geophysical Fluid Dynamics Laboratory (GFDL) has developed a coupled general circulation model (CM3) for the atmosphere, oceans, land, and sea ice. The goal of CM3 is to address emerging issues in climate change, including aerosol–cloud ...

Leo J. Donner; Bruce L. Wyman; Richard S. Hemler; Larry W. Horowitz; Yi Ming; Ming Zhao; Jean-Christophe Golaz; Paul Ginoux; S.-J. Lin; M. Daniel Schwarzkopf; John Austin; Ghassan Alaka; William F. Cooke; Thomas L. Delworth; Stuart M. Freidenreich; C. T. Gordon; Stephen M. Griffies; Isaac M. Held; William J. Hurlin; Stephen A. Klein; Thomas R. Knutson; Amy R. Langenhorst; Hyun-Chul Lee; Yanluan Lin; Brian I. Magi; Sergey L. Malyshev; P. C. D. Milly; Vaishali Naik; Mary J. Nath; Robert Pincus; Jeffrey J. Ploshay; V. Ramaswamy; Charles J. Seman; Elena Shevliakova; Joseph J. Sirutis; William F. Stern; Ronald J. Stouffer; R. John Wilson; Michael Winton; Andrew T. Wittenberg; Fanrong Zeng

2011-07-01T23:59:59.000Z

309

The connection between Labrador Sea buoyancy loss, deep western boundary current strength, and Gulf Stream path in an ocean circulation model  

E-Print Network [OSTI]

in the diagnostic sea ice model, and insulation of the ocean, which is less physical with the prognostic sea ice and surface water mass transformation are strongly dependent on the choice of sea ice and salinity restoring boundary condi- tions. Coupling the ocean model to a prognostic sea ice model results in much greater

Jochum, Markus

310

A generalized lattice Boltzmann model for flow through tight porous media with Klinkenberg's effect  

E-Print Network [OSTI]

Gas slippage occurs when the mean free path of the gas molecules is in the order of the characteristic pore size of a porous medium. This phenomenon leads to the Klinkenberg's effect where the measured permeability of a gas (apparent permeability) is higher than that of the liquid (intrinsic permeability). A generalized lattice Boltzmann model is proposed for flow through porous media that includes Klinkenberg's effect, which is based on the model of Guo et al. (Z.L. Guo et al., Phys.Rev.E 65, 046308 (2002)). The second-order Beskok and Karniadakis-Civan's correlation (A. Beskok and G. Karniadakis, Microscale Thermophysical Engineering 3, 43-47 (1999), F. Civan, Transp Porous Med 82, 375-384 (2010)) is adopted to calculate the apparent permeability based on intrinsic permeability and Knudsen number. Fluid flow between two parallel plates filled with porous media is simulated to validate model. Simulations performed in a heterogeneous porous medium with components of different porosity and permeability indicat...

Chen, Li; Kang, Qinjun; Hyman, Jeffrey De'Haven; Viswanathan, Hari S; Tao, Wen-Quan

2014-01-01T23:59:59.000Z

311

Generated using V3.1.2 of the official AMS LATEX templatejournal page layout FOR AUTHOR USE ONLY, NOT FOR SUBMISSION! Hadley circulation response to orbital precession. Part I: Aquaplanets  

E-Print Network [OSTI]

, NOT FOR SUBMISSION! Hadley circulation response to orbital precession. Part I: Aquaplanets Timothy M. Merlis-mean Hadley circulation to orbital precession is examined in an idealized atmospheric general circulation Hadley circulation is weaker when perihelion occurs at the summer solstice than when aphelion occurs

Heaton, Thomas H.

312

Remarks on monopole charge properties within the Generalized Coherent State Model  

E-Print Network [OSTI]

The Generalized Coherent State Model, proposed previously for a unified description of magnetic and electric collective properties of nuclear systems, is used to study the ground state band charge density as well as the E0 transitions from $0^+_{\\beta}$ to $0^+_g$. The influence of the nuclear deformation and of angular momentum projection on the charge density is investigated. The monopole transition amplitude has been calculated for ten nuclei. The results are compared with some previous theoretical studies and with the available experimental data. Our results concerning angular momentum projection are consistent with those of previous microscopic calculations for the ground state density. The calculations for the E0 transitions agree quite well with the experimental data. Issues like how the shape transitions or shape coexistence are reflected in the $\\rho(E0)$ behavior are also addressed.

Raduta, A A; de Guerra, E Moya; Sarriguren, P; 10.1088/0954-3899/36/1/015114

2008-01-01T23:59:59.000Z

313

Generally covariant model of a scalar field with high frequency dispersion and the cosmological horizon problem  

E-Print Network [OSTI]

Short distance structure of spacetime may show up in the form of high freqency dispersion. Although such dispersion is not locally Lorentz invariant, we show in a scalar field model how it can nevertheless be incorporated into a generally covariant metric theory of gravity provided the locally preferred frame is dynamical. We evaluate the resulting energy-momentum tensor and compute its expectation value for a quantum field in a thermal state. The equation of state differs at high temperatures from the usual one, but not by enough to impact the problems of a hot big bang cosmology. We show that a superluminal dispersion relation can solve the horizon problem via superluminal equilibration, however it cannot do so while remaining outside the Planck regime unless the dispersion relation is artificially chosen to have a rather steep dependence on wavevector.

Ted Jacobson; David Mattingly

2000-09-11T23:59:59.000Z

314

Hartle's model within the general theory of perturbative matchings: the change in mass  

E-Print Network [OSTI]

Hartle's model provides the most widely used analytic framework to describe isolated compact bodies rotating slowly in equilibrium up to second order in perturbations in the context of General Relativity. Apart from some explicit assumptions, there are some implicit, like the "continuity" of the functions in the perturbed metric across the surface of the body. In this work we sketch the basics for the analysis of the second order problem using the modern theory of perturbed matchings. In particular, the result we present is that when the energy density of the fluid in the static configuration does not vanish at the boundary, one of the functions of the second order perturbation in the setting of the original work by Hartle is not continuous. This discrepancy affects the calculation of the change in mass of the rotating star with respect to the static configuration needed to keep the central energy density unchanged.

Borja Reina; Raül Vera

2014-12-22T23:59:59.000Z

315

Nonlinear generalized source method for modeling second-harmonic generation in diffraction gratings  

E-Print Network [OSTI]

We introduce a versatile numerical method for modeling light diffraction in periodically patterned photonic structures containing quadratically nonlinear non-centrosymmetric optical materials. Our approach extends the generalized source method to nonlinear optical interactions by incorporating the contribution of nonlinear polarization sources to the diffracted field in the algorithm. We derive the mathematical formalism underlying the numerical method and introduce the Fourier-factorization suitable for nonlinear calculations. The numerical efficiency and runtime characteristics of the method are investigated in a set of benchmark calculations: the results corresponding to the fundamental frequency are compared to those obtained from a reference method and the beneficial effects of the modified Fourier-factorization rule on the accuracy of the nonlinear computations is demonstrated. In order to illustrate the capabilities of our method, we employ it to demonstrate strong enhancement of second-harmonic genera...

Weismann, Martin; Panoiu, Nicolae C

2015-01-01T23:59:59.000Z

316

Distant origins of Arctic black carbon: A Goddard Institute for Space Studies ModelE experiment  

E-Print Network [OSTI]

profile, cloud temperature and amount, the seasonal cycle, and the tropopause level and accelerating polar ice melting. We use the Goddard Institute for Space Studies general circulation model to investigate is generally assumed. Citation: Koch, D., and J. Hansen (2005), Distant origins of Arctic black carbon

317

Real-Time Monitoring of Rare Circulating Hepatocellular Carcinoma Cells in an Orthotopic Model by In Vivo Flow Cytometry Assesses Resection on Metastasis  

Science Journals Connector (OSTI)

...single-exponential models with the Fit TPSF tool. PIT for in vitro and in vivo models PIT was conducted with a red light-emitting diode (LED) light at 680 to 700 nm wavelength (Tech-LED, Marubeni America Co.; ref. 2). Power densities were...

Zhi-Chao Fan; Jun Yan; Guang-Da Liu; Xiao-Ying Tan; Xiao-Fu Weng; Wei-Zhong Wu; Jian Zhou; Xun-Bin Wei

2012-05-15T23:59:59.000Z

318

On the Patterns of Wind-Power Input to the Ocean Circulation  

E-Print Network [OSTI]

Pathways of wind-power input into the ocean general circulation are analyzed using Ekman theory. Direct rates of wind work can be calculated through the wind stress acting on the surface geostrophic flow. However, because ...

Roquet, Fabien

319

Available Potential Energy and Irreversible Mixing in the Meridional Overturning Circulation  

Science Journals Connector (OSTI)

The overturning circulation of the global oceans is examined from an energetics viewpoint. A general framework for stratified turbulence is used for this purpose; first, it highlights the importance of available potential energy in facilitating ...

Graham O. Hughes; Andrew Mc C. Hogg; Ross W. Griffiths

2009-12-01T23:59:59.000Z

320

Entanglement Entropy of the Early Universe in Generalized Chaplygin Gas Model  

E-Print Network [OSTI]

We provide an explicit calculation of the evolution of the cosmic entanglement entropy in the early universe before the matter dominant era. This is made possible by invoking the generalized Chaplygin gas (GCG) model, which has the advantage of preserving unitarity and providing a smooth transition between the inflation epoch and the radiation dominant era. The dynamics of the universe is described by the quantization in the minisuperspace of the GCG model, following the prescription proposed by Wheeler and DeWitt. Two sources of contribution to the cosmic entanglement entropy are considered: one from the homogeneous background where the observable and the unobservable regions of the universe are entangled and the other from the inhomogeneous cosmological perturbations where different modes are entangled. We find that the homogeneous contribution grows exponentially at the very beginning of the inflation, but decreases during the radiation dominant era. Conversely, that from the cosmological perturbation is found to decrease at first and then increase after reaching a minimum value. The net result is that the total entanglement entropy reaches a minimum at an early stage of the inflation and then increases throughout most of the inflation and the entire radiation dominant era.

Pisin Chen; Yuezhen Niu

2011-12-07T23:59:59.000Z

Note: This page contains sample records for the topic "general circulation models" 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

Shelf circulation patterns off Nigeria  

E-Print Network [OSTI]

. An oil spill occurred in January of 1998, the slick drifted in the opposite direction at twice the speed as was anticipated. It was believed that the heavy discharge from the Niger River Delta would have a strong influence on the near-shore circulation...

Rider, Kelly Elizabeth

2005-08-29T23:59:59.000Z

322

Ocean Circulation Lynne D Talley  

E-Print Network [OSTI]

to the topography, with low pressure in the center. Ocean currents transport heat from the tropics to the poles have gone to sea. As knowledge about ocean currents and capabilities to observe it below the surfaceOcean Circulation Lynne D Talley Volume 1, The Earth system: physical and chemical dimensions

Talley, Lynne D.

323

Dealing with big circulation flow, small temperature difference based on verified dynamic model simulations of a hot water district heating system  

E-Print Network [OSTI]

,?C Gcoal,T/Day Ts1v,?C Tr1v,?C Tw2argv,?C Gcoalv,T/Day Figure 4. Verified Model Responses With Operational Data 2.4 Properties Analysis From The Verified Model Simulations Based on the verified model, the factors ]1,25.1,1.1[],,[ ?enhex fff.../s HV heating value, J/Kg kp proportional gain ki integral gain KF heat transfer coefficient, W/? q heat per unit area, W/m2 Q heat, W t time, s T temperature, ? TD temperature difference, ? u control signal 30 ?? ? factors Subscripts 1, 2...

Zhong, L.

2014-01-01T23:59:59.000Z

324

Position Paper: A general framework for Dynamic Emulation Modelling in environmental problems  

Science Journals Connector (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

325

Continuous Circulation System: a new enabling technology  

E-Print Network [OSTI]

are caused by the interruption of the drilling-fluid circulation. This interruption normally occurs when making drillpipe connections. Interruption of circulation causes wellbore problems like ballooning of the well, gelation of drilling mud, and settling...

Kenawy, Walid F.

2012-06-07T23:59:59.000Z

326

Tracking control of a biaxial piezo-actuated positioning stage using generalized Duhem model  

Science Journals Connector (OSTI)

Nonlinear hysteresis modeling is studied using a novel PZT-actuated flexure-based mechanism. To compare the performance of variant hysteresis models with respect to the tracking reference, we reformulate the Bouc-Wen model, the Dahl model and the Duhem ... Keywords: Bouc-Wen model, Dahl model, Duhem model, Hysteresis, Particle swarm optimization, Piezo-actuator

Chih-Jer Lin; Po-Ting Lin

2012-09-01T23:59:59.000Z

327

Axisymmetric equilibrium models for magnetized neutron stars in General Relativity under the Conformally Flat Condition  

E-Print Network [OSTI]

Extremely magnetized neutron stars with magnetic fields as strong as $\\sim 10^{15-16}$ G, or magnetars, have received considerable attention in the last decade due to their identification as a plausible source for Soft Gamma Repeaters and Anomalous X-ray Pulsars. Moreover, this class of compact objects has been proposed as a possible engine capable of powering both Long and Short Gamma-Ray Bursts, if the rotation period in their formation stage is short enough (~1 ms). Such strong fields are expected to induce substantial deformations of the star and thus to produce the emission of gravitational waves. Here we investigate, by means of numerical modeling, axisymmetric static equilibria of polytropic and strongly magnetized stars in full general relativity, within the ideal magneto-hydrodynamic regime. The eXtended Conformally Flat Condition (XCFC) for the metric is assumed, allowing us to employ the techniques introduced for the X-ECHO code [Bucciantini & Del Zanna, 2011, Astron. Astrophys. 528, A101], pro...

Pili, A G; Del Zanna, L

2014-01-01T23:59:59.000Z

328

Experimental and Modeling Study of Sulfur Capture by Limestone in Selected Conditions of Air-Fired and Oxy-fuel Circulating Fluidized-Bed Boilers  

Science Journals Connector (OSTI)

Liu et al.(5) noticed the influence of the system itself, noting that SO2 is enriched in the furnace of oxy-fuel combustion systems because the flue gas is recycled. ... This work has also been supported by the Academy of Finland under Grant 124368 and Foster Wheeler Energia Oy. ... In this study, the influence of CO2 on sulfur capture efficiency was studied during fluidized-bed desulfurization by experiments and modeling. ...

Sirpa Takkinen; Timo Hyppänen; Jaakko Saastamoinen; Toni Pikkarainen

2011-06-30T23:59:59.000Z

329

Posters Treatment of Cloud Radiative Effects in General Circulation...  

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

optical properties and 2) to study the effects of cloudradiation- climate interaction on climate simulations. This report summarizes project progress from March 1993 to March...

330

Response of the Hadley Circulation to Climate Change in an Aquaplanet GCM Coupled to a Simple Representation of Ocean Heat Transport  

Science Journals Connector (OSTI)

It is unclear how the width and strength of the Hadley circulation are controlled and how they respond to climate changes. Simulations of global warming scenarios with comprehensive climate models suggest the Hadley circulation may widen and ...

Xavier J. Levine; Tapio Schneider

2011-04-01T23:59:59.000Z

331

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

332

On the dynamics of the Hadley circulation and subtropical drying Kristopher B. Karnauskas Caroline C. Ummenhofer  

E-Print Network [OSTI]

On the dynamics of the Hadley circulation and subtropical drying Kristopher B. Karnauskas Heidelberg 2014 Abstract Changes in subtropical precipitation and the Hadley circulation (HC) are inextricably linked. The ori- ginal Halley­Hadley model cannot explain certain aspects of the Earth

Karnauskas, Kristopher

333

Introduction Large-scale circulation Clouds Conclusions European temperature extremes in CMIP5  

E-Print Network [OSTI]

Introduction Large-scale circulation Clouds Conclusions European temperature extremes in CMIP5 extremes in CMIP5 EUCLIPSE ­ May 2012 ­ Paris #12;Introduction Large-scale circulation Clouds Conclusions Introduction Objectives European temperature extremes: understand model biases & uncertainties under future

Ribes, Aurélien

334

The Role of Subtropical Irreversible PV Mixing in the Zonal Mean Circulation Response to Global Warming-like Thermal Forcing  

SciTech Connect (OSTI)

The atmospheric circulation response to the global warming-like tropical upper tropospheric heating is revisited using a dry atmospheric general circulation model (AGCM) in light of a new diagnostics based on the concept of finite-amplitude wave activity (FAWA) on equivalent latitude. For a given tropical heating profile, the linear Wentzel-Kramers-Brillouin (WKB) wave refraction analysis sometimes gives a very different and even opposite prediction of the eddy momentum flux response to that of the actual full model simulation, exposing the limitation of the traditional linear approach in understanding the full dynamics of the atmospheric response under global warming. The implementation of the FAWA diagnostics reveals that in response to the upper tropospheric heating, effective diffusivity, a measure of the mixing efficiency, increases and advances upward and poleward in the subtropics and the resultant enhancement and the poleward encroachment of eddy potential vorticity mixing leads to a poleward displaced potential vorticity (PV) gradient peak in the upper troposphere. The anomalous eddy PV flux, in balance with the PV dissipation, gives rise to a poleward shift in the eddy-driven jet and eddy-driven mean meridional circulation. Sensitivity experiments show that these irreversible dissipation processes in the upper troposphere are robust, regardless of the width of the tropical heating.

Lu, Jian; Sun, Lantao; Wu, Yutian; Chen, Gang

2014-03-15T23:59:59.000Z

335

Estimating of the Dry Unit Weight of Compacted Soils Using General Linear Model and Multi-layer Perceptron Neural Networks  

Science Journals Connector (OSTI)

Compaction of earth fill is a very important stage of construction projects. Degree of compaction is defined by relative compaction. The relative compaction of a compacted earth fill is calculated by dividing the dry unit weight obtained from in situ ... Keywords: Dry unit weight, Earth fill, General linear model, Multi-layer perceptron neural networks, Relative compaction, Standard Proctor test

Ersin Kolay, Tugce Baser

2014-05-01T23:59:59.000Z

336

General Relativistic Shock Waves that Extend the Oppenheimer-Snyder Model  

Science Journals Connector (OSTI)

...In earlier work we constructed a class of spherically symmetric, fluid dynamical shock waves that satisfy the Einstein equations of general relativity. These shock waves extend the celebrated Oppenheimer-Snyde...

Joel Smoller; Blake Temple

1997-07-01T23:59:59.000Z

337

Circulating fluidised-bed combustion  

SciTech Connect (OSTI)

Steam generators with circulating fluidized-bed combustion systems (CFBC) are characterized by a high degree of environmental comparability and a wide acceptance for FBC boiler plants involving a wide fuel spectrum which ranges from dried brown coal to high-ash coal and low-volatile bituminous coal as well as wood waste and bark. These plants incorporate a variety of CFBC systems. The choice in favor of different system options was not motivated by the inherent fuel properties but has evolved from the progressive advancement in power station FBC technology. The article elucidates several FBC system variants.

Rettemeier, W.; von der Kammer, G. (Steinmueller (L.u.C.) GmbH, Gummersbach (Germany, F.R.))

1990-01-01T23:59:59.000Z

338

Integrability study on a generalized (2+1)-dimensional variable-coefficient Gardner model with symbolic computation  

SciTech Connect (OSTI)

Gardner model describes certain nonlinear elastic structures, ion-acoustic waves in plasmas, and shear flows in ocean and atmosphere. In this paper, by virtue of the computerized symbolic computation, the integrability of a generalized (2+1)-dimensional variable-coefficient Gardner model is investigated. Painleve integrability conditions are derived among the coefficient functions, which reduce all the coefficient functions to be proportional only to {gamma}(t), the coefficient of the cubic nonlinear term u{sup 2}u{sub x}. Then, an independent transformation of the variable t transforms the reduced {gamma}(t)-dependent equation into a constant-coefficient integrable one. Painleve test shows that this is the only case when our original generalized (2+1)-dimensional variable-coefficient Gardner model is integrable.

Lue Xing; Zhang Haiqiang; Xu Tao; Li He [School of Science, Beijing University of Posts and Telecommunications, P.O. Box 122, Beijing 100876 (China); Tian Bo [School of Science, Beijing University of Posts and Telecommunications, P.O. Box 122, Beijing 100876 (China); State Key Laboratory of Software Development Environment, Beijing University of Aeronautics and Astronautics, Beijing 100191 (China); Key Laboratory of Information Photonics and Optical Communications (BUPT), Ministry of Education, Beijing University of Posts and Telecommunications, P.O. Box 128, Beijing 100876 (China)

2010-12-15T23:59:59.000Z

339

Method for Determining Solids Circulation Rate  

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

Determining Solids Circulation Rate Determining Solids Circulation Rate Contact NETL Technology Transfer Group techtransfer@netl.doe.gov May 2012 Opportunity Research is currently active on the patented technology "Method for Determining Solids Circulation Rate." The technology is available for licensing and/or further collaborative research from the U.S. Department of Energy's National Energy Technology Laboratory. Overview This invention provides a method to measure the rate of solids circulation, particularly in those applications where the solids are recycled back to pro- cesses for further use. The applications include processes such as circulating fluidized bed gasifiers and combustors, as well as chemical looping. In the above applications, determining solids circulation rates is needed to

340

Regional Frequency Analysis at Ungauged Sites with the Generalized Additive Model  

Science Journals Connector (OSTI)

The log-linear regression model is one of the most commonly used models to estimate flood quantiles at ungauged sites within the regional frequency analysis (RFA) framework. However, hydrological processes are naturally complex in several aspects ...

F. Chebana; C. Charron; T. B. M. J. Ouarda; B. Martel

2014-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "general circulation models" 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

Electrochimica Acta 51 (2006) 20122022 A generalized cycle life model of rechargeable Li-ion batteries  

E-Print Network [OSTI]

­discharge model to simulate the cycle life behavior of rechargeable Li-ion batteries has been developed. The model and Newman [4] made a first attempt to model the parasitic reaction in Li-ion batteries by assuming a solvent and reversible capacity loss due to the growth and dissolution of SEI film in Li-ion batteries. Ramadass et al

Popov, Branko N.

342

A general formulation of Bead Models applied to flexible fibers and active filaments at low Reynolds number  

E-Print Network [OSTI]

This contribution provides a general framework to use Lagrange multipliers for the simulation of low Reynolds number fiber dynamics based on Bead Models (BM). This formalism provides an efficient method to account for kinematic constraints. We illustrate, with several examples, to which extent the proposed formulation offers a flexible and versatile framework for the quantitative modeling of flexible fibers deformation and rotation in shear flow, the dynamics of actuated filaments and the propulsion of active swimmers. Furthermore, a new contact model called Gears Model is proposed and successfully tested. It avoids the use of numerical artifices such as repulsive forces between adjacent beads, a source of numerical difficulties in the temporal integration of previous Bead Models.

Delmotte, Blaise; Plouraboue, Franck

2015-01-01T23:59:59.000Z

343

Separating expansion from contraction in spherically symmetric models with a perfect fluid: Generalization of the Tolman-Oppenheimer-Volkoff condition and application to models with a cosmological constant  

SciTech Connect (OSTI)

We investigate spherically symmetric perfect-fluid spacetimes and discuss the existence and stability of a dividing shell separating expanding and collapsing regions. We perform a 3+1 splitting and obtain gauge invariant conditions relating the intrinsic spatial curvature of the shells to the Misner-Sharp mass and to a function of the pressure that we introduce and that generalizes the Tolman-Oppenheimer-Volkoff equilibrium condition. We find that surfaces fulfilling those two conditions fit, locally, the requirements of a dividing shell, and we argue that cosmological initial conditions should allow its global validity. We analyze the particular cases of the Lemaitre-Tolman-Bondi dust models with a cosmological constant as an example of a cold dark matter model with a cosmological constant ({Lambda}-CDM model) and its generalization to contain a central perfect-fluid core. These models provide simple but physically interesting illustrations of our results.

Mimoso, Jose P.; Le Delliou, Morgan; Mena, Filipe C. [Departamento de Fisica, Faculdade de Ciencias da Universidade de Lisboa, Centro de Astronomia e Astrofisica, Universidade de Lisboa, Avenida Gama Pinto 2, 1649-003 Lisboa (Portugal); Instituto de Fisica Teorica UAM/CSIC, Facultad de Ciencias, C-XI, Universidad Autonoma de Madrid, Cantoblanco, 28049 Madrid (Spain); Centro de Matematica, Universidade do Minho, Campus de Gualtar, 4710-057 Braga (Portugal)

2010-06-15T23:59:59.000Z

344

Interaction between the Brewer–Dobson Circulation and the Hadley Circulation  

Science Journals Connector (OSTI)

Interannual changes of the stratospheric circulation are studied in relation to coherent changes of the tropospheric circulation. Emerging over the winter pole is a clear signature of adiabatic warming and anomalous downwelling. Reflecting an ...

Murry L. Salby; Patrick F. Callaghan

2005-10-01T23:59:59.000Z

345

The Non-Autonomous Chiral Model and the Ernst Equation of General Relativity in the Bidifferential Calculus Framework  

E-Print Network [OSTI]

The non-autonomous chiral model equation for an $m \\times m$ matrix function on a two-dimensional space appears in particular in general relativity, where for $m=2$ a certain reduction of it determines stationary, axially symmetric solutions of Einstein's vacuum equations, and for $m=3$ solutions of the Einstein-Maxwell equations. Using a very simple and general result of the bidifferential calculus approach to integrable partial differential and difference equations, we generate a large class of exact solutions of this chiral model. The solutions are parametrized by a set of matrices, the size of which can be arbitrarily large. The matrices are subject to a Sylvester equation that has to be solved and generically admits a unique solution. By imposing the aforementioned reductions on the matrix data, we recover the Ernst potentials of multi-Kerr-NUT and multi-Demianski-Newman metrics.

Aristophanes Dimakis; Nils Kanning; Folkert Müller-Hoissen

2011-12-23T23:59:59.000Z

346

Multidecadal variability of the overturning circulation in presence of eddy turbulence.  

Science Journals Connector (OSTI)

At low resolution, idealized ocean circulation models forced by prescribed differential surface heat fluxes show spontaneous multidecadal variability depending critically on eddy diffusivity coefficients. The existence of this critical threshold ...

Thierry Huck; Olivier Arzel; Florian Sévellec

347

Response of the Hadley Circulation to Convective Forcing in the ITCZ  

Science Journals Connector (OSTI)

Through the use of a zonal balance model we investigate the response of the mean meridional circulation to a specified diabatic forcing for both resting and nonresting zonal flows. The use of a potential latitude coordinate and transformed ...

James J. Hack; Wayne H. Schubert; Duane E. Stevens; Hung-Chi Kuo

1989-10-01T23:59:59.000Z

348

A Scheme to Retain the Hadley Circulation During Nonlinear Normal Mode Initialization  

Science Journals Connector (OSTI)

A modified nonlinear normal mode initialization scheme is proposed which provides a possible solution to a major problem associated with nonlinear normal mode initialization. The modified scheme retains the Hadley circulation in the model and at ...

K. Puri; W. Bourke

1982-05-01T23:59:59.000Z

349

Hadley Circulations in Radiative–Convective Equilibrium in an Axially Symmetric Atmosphere  

Science Journals Connector (OSTI)

Hadley circulations in radiative–convective equilibrium are investigated using an idealistic axially symmetric model. Calculations show that the distribution of temperature in the Hadley cell is controlled by the moist process; the vertical ...

Masaki Satoh

1994-07-01T23:59:59.000Z

350

The Role of the Ocean in the Seasonal Cycle of the Hadley Circulation  

Science Journals Connector (OSTI)

The influence of ocean heat transport on the seasonal cycle of the Hadley circulation is investigated using idealized experiments with a climate model. It is found that ocean heat transport plays a fundamental role in setting the structure and ...

Amy C. Clement

2006-12-01T23:59:59.000Z

351

Global impact of smoke aerosols from landscape fires on climate and the Hadley circulation  

E-Print Network [OSTI]

climate sensitivity in the Hadley Centre climate model, J.and Clement, A. : Has the Hadley cell been strength- eningA. J. : On the link between Hadley circulation changes and

Tosca, M. G; Randerson, J. T; Zender, C. S

2013-01-01T23:59:59.000Z

352

Mott Insulator-Superfluid Transition in a Generalized Bose-Hubbard Model with Topologically Non-trivial Flat-Band  

E-Print Network [OSTI]

In this paper, we studied a generalized Bose-Hubbard model on a checkerboard lattice with topologically nontrivial flat-band. We used mean-field method to decouple the model Hamiltonian and obtained phase diagram by Landau theory of second-order phase transition. We further calculate the energy gap and the dispersion of quasi-particle or quasi-hole in Mott insulator state and found that in strong interaction limit the quasi-particles or the quasi-holes also have flat bands.

Xing-Hai Zhang; Su-Peng Kou

2012-05-30T23:59:59.000Z

353

An integrated life cycle quality model for general public market software products  

E-Print Network [OSTI]

. The requirements are built upon existing industry standards, including ISO 9001. The TL 9000 Quality System quality view of TL9000 Handbook and detailed view from ISO/IEC 1926 in the process of defining, measuring by TL9000-ISO complement model as well as by application process walk-through. #12;1. Complement model

Laporte, Claude Y.

354

Convolution Particle Filter for Parameter Estimation in General State-Space Models  

E-Print Network [OSTI]

study. Index Terms Bayes procedures, Hidden Markov models, Marine vehicle detection and tracking, Monte Campillo and Vivien Rossi Abstract The state-space modeling of partially observed dynamical systems to the parameter components or to the deterministic component of the dynamical system. However, this approach

Rossi, Vivien

355

Role of Changes in Mean Temperatures versus Temperature Gradients in the Recent Widening of the Hadley Circulation  

Science Journals Connector (OSTI)

The Hadley circulation (HC) has widened in recent decades, and it widens as the climate warms in simulations. But the mechanisms responsible for the widening remain unclear, and the widening in simulations is generally smaller than observed.

Ori Adam; Tapio Schneider; Nili Harnik

2014-10-01T23:59:59.000Z

356

Wave Energy Converter (WEC) Array Effects on Wave Current and Sediment Circulation: Monterey Bay CA.  

SciTech Connect (OSTI)

The goal s of this study were to develop tools to quantitatively characterize environments where wave energy converter ( WEC ) devices may be installed and to assess e ffects on hydrodynamics and lo cal sediment transport. A large hypothetical WEC array was investigated using wave, hydrodynamic, and sediment transport models and site - specific average and storm conditions as input. The results indicated that there were significant changes in sediment s izes adjacent to and in the lee of the WEC array due to reduced wave energy. The circulation in the lee of the array was also altered; more intense onshore currents were generated in the lee of the WECs . In general, the storm case and the average case show ed the same qualitative patterns suggesting that these trends would be maintained throughout the year. The framework developed here can be used to design more efficient arrays while minimizing impacts on nearshore environmen ts.

Roberts, Jesse D.; Jones, Craig; Magalen, Jason

2014-09-01T23:59:59.000Z

357

The Impact of Oceanic Heat Transport on the Atmospheric Circulation: a Thermodynamic Perspective  

E-Print Network [OSTI]

The present study investigates how global thermodynamic properties of the climate system are affected by the changes in the intensity of the imposed oceanic heat transport in an atmospheric general circulation model in aqua-planet configuration. Increasing the poleward oceanic heat transport results in an overall increase in the surface temperature and a decrease in the equator-to-pole surface temperature difference as a result of the ice-albedo feedback. Following the classical ansatz by Stone, the atmospheric heat transport changes in such a way that the total poleward heat transport remains almost unchanged. We also find that the efficiency of the climate machine, the intensity of the Lorenz energy cycle and the material entropy production of the system decline with increased oceanic heat transport which suggests that the climate system becomes less efficient and turns into a state of reduced entropy production, as the enhanced oceanic transport performs a stronger large-scale mixing between geophysical fl...

Schröder, Alexander; Lunkeit, Frank

2014-01-01T23:59:59.000Z

358

Downhole material injector for lost circulation control  

DOE Patents [OSTI]

Apparatus and method are disclosed for simultaneously and separately emplacing two streams of different materials through a drill string in a borehole to a downhole location for lost circulation control. The two streams are mixed outside the drill string at the desired downhole location and harden only after mixing for control of a lost circulation zone. 6 figs.

Glowka, D.A.

1994-09-06T23:59:59.000Z

359

Anatomy of an transparent optical circulator.  

SciTech Connect (OSTI)

An optical circulator is a multi-port, nonreciprocal device that routes light from one specific port to another. Optical circulators have at least 3 or 4 ports, up to 6 port possible (JDS Uniphase, Huihong Fiber) Circulators do not disregard backward propagating light, but direct it to another port. Optical circulators are commonly found in bi-directional transmission systems, WDM networks, fiber amplifiers, and optical time domain reflectometers (OTDRs). 3-Port optical circulators are commonly used in PDV systems. 1550 nm laser light is launched into Port 1 and will exit out of Port 2 to the target. Doppler-shifted light off the moving surface is reflected back into Port 2 and exits out of Port 3. Surprisingly, a circulator requires a large number of parts to operate efficiently. Transparent circulators offer higher isolation than those of the reflective style using PBSs. A lower PMD is obtained using birefringent crystals rather than PBSs due to the similar path lengths between e and o rays. Many various circulator designs exist, but all achieve the same non-reciprocal results.

Podsednik, Jason W.

2010-09-01T23:59:59.000Z

360

Downhole material injector for lost circulation control  

DOE Patents [OSTI]

This invention is comprised of an apparatus and method for simultaneously and separately emplacing two streams of different materials through a drillstring in a borehole to a downhole location for lost circulation control. The two streams are mixed outside the drillstring at the desired downhole location and harden only after mixing for control of a lost circulation zone.

Glowka, D.A.

1991-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "general circulation models" 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

2, 129164, 2005 The circulation of the  

E-Print Network [OSTI]

OSD 2, 129­164, 2005 The circulation of the Persian Gulf J. K¨ampf and M. Sadrinasab Title Page of the Persian Gulf: a numerical study J. K¨ampf1 and M. Sadrinasab2 1 School of Chemistry, Physics and Earth The circulation of the Persian Gulf J. K¨ampf and M. Sadrinasab Title Page Abstract Introduction Conclusions

Paris-Sud XI, Université de

362

Microfluidic Platforms for Capturing Circulating Tumor Cells  

E-Print Network [OSTI]

Microfluidic Platforms for Capturing Circulating Tumor Cells Sweta Gupta, Allison C. Baker-cost microfluidic device that can be used to isolate and capture circulating tumor cells (CTCs) from whole blood. The device was made from polydimethylsiloxane (PDMS) consisting of a microfluidic channel with microposts

Tang, William C

363

Adapting a Beam-Based Rotordynamics Model to Accept a General Three-Dimensional Finite-Element Casing Model  

E-Print Network [OSTI]

-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...

James, Stephen M.

2011-08-08T23:59:59.000Z

364

A generalized nutrition model for Odocoileus deer and its application in a natural environment  

E-Print Network [OSTI]

A model of protein and energy balance was created for Odocoileus deer [white-tailed deer (Odocoileus virginianus), mule deer (O. hemionus), and black-tailed deer (O. h. columbianus, O. h. sitkensis)] capable of predicting changes in body weight...

Applegath, Matthew Thomas

2002-01-01T23:59:59.000Z

365

Generalized enthalpy model of a high-pressure shift freezing process  

Science Journals Connector (OSTI)

...non-homogeneous temperature distribution induces a non-homogeneous...computational model for temperature and sterility distributions in a pilot-scale...high-pressure high-temperature process. A.I...and Da-Wen. Sun 2009 Simulation...

2012-01-01T23:59:59.000Z

366

A general model of resource production and exchange in systems of interdependent specialists.  

SciTech Connect (OSTI)

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

367

Development of a general model of aggregate rebound for dry-mix shotcrete—(Part II)  

Science Journals Connector (OSTI)

A mechanical model previously developed is briefly described and linked to particle velocity versus size relationships experimentally obtained, allowing prediction of the energy of rebound of an aggregate particl...

Hugo S. Armelin Ph.D. Candidate; Professor Nemkumar Banthia

1998-04-01T23:59:59.000Z

368

Reversing the Circulation of Magnetic Vortices  

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

Reversing the Circulation of Reversing the Circulation of Magnetic Vortices Reversing the Circulation of Magnetic Vortices Print Wednesday, 31 July 2013 00:00 In magnetic media, information is stored in binary form-one or zero, depending on which way the electronic spins are aligned in a given section of the medium. Recently, however, magnetic vortices have drawn scientists toward a new possibility: multibit storage in which each logic unit has four states instead of two and can store twice the information. Each tiny magnetic whirl has a polarity that can point up or down and a circulation that can be oriented clockwise or counterclockwise. Previous studies have shown that the polarity can be flipped on command. Now, using time-resolved magnetic soft x-ray microscopy at the ALS, researchers have shown for the first time how to use pulsed magnetic fields to reverse the circulation.

369

Testing Lack-of-Fit of Generalized Linear Models via Laplace Approximation  

E-Print Network [OSTI]

Coefficients used in (5.6) to evaluate power to detect the omission of a interaction term. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 12 Performance of the Bayes sum test in detecting an omitted dichoto- mous variable and its interaction... was obtained using a smoothing spline fit. The parametric model was obtained by modeling the log odds with the parametric linear predictor: ?0 + ?3(x ? 12)? I(x > 12) where x denotes the start variable. . . . . . . . . . . . . . . . . . . . . . . . . 138 4...

Glab, Daniel Laurence

2012-07-16T23:59:59.000Z

370

A general approach to develop reduced order models for simulation of solid oxide fuel cell stacks  

SciTech Connect (OSTI)

A reduced order modeling approach based on response surface techniques was developed for solid oxide fuel cell stacks. This approach creates a numerical model that can quickly compute desired performance variables of interest for a stack based on its input parameter set. The approach carefully samples the multidimensional design space based on the input parameter ranges, evaluates a detailed stack model at each of the sampled points, and performs regression for selected performance variables of interest to determine the responsive surfaces. After error analysis to ensure that sufficient accuracy is established for the response surfaces, they are then implemented in a calculator module for system-level studies. The benefit of this modeling approach is that it is sufficiently fast for integration with system modeling software and simulation of fuel cell-based power systems while still providing high fidelity information about the internal distributions of key variables. This paper describes the sampling, regression, sensitivity, error, and principal component analyses to identify the applicable methods for simulating a planar fuel cell stack.

Pan, Wenxiao; Bao, Jie; Lo, Chaomei; Lai, Canhai; Agarwal, Khushbu; Koeppel, Brian J.; Khaleel, Mohammad A.

2013-06-15T23:59:59.000Z

371

Generated using V3.1.2 of the official AMS LATEX templatejournal page layout FOR AUTHOR USE ONLY, NOT FOR SUBMISSION! Hadley circulation response to orbital precession. Part II: Subtropical continent  

E-Print Network [OSTI]

, NOT FOR SUBMISSION! Hadley circulation response to orbital precession. Part II: Subtropical continent Timothy M and annual-mean Hadley circulation to orbital precession is examined in an idealized atmospheric general precession does not affect annual-mean insolation, the annual-mean Hadley circulation does respond to orbital

Heaton, Thomas H.

372

A general relativistic model for the light propagation in the gravitational field of the Solar System: the dynamical case  

E-Print Network [OSTI]

Modern astrometry is based on angular measurements at the micro-arcsecond level. At this accuracy a fully general relativistic treatment of the data reduction is required. This paper concludes a series of articles dedicated to the problem of relativistic light propagation, presenting the final microarcsecond version of a relativistic astrometric model which enable us to trace back the light path to its emitting source throughout the non-stationary gravity field of the moving bodies in the Solar System. The previous model is used as test-bed for numerical comparisons to the present one. Here we also test different versions of the computer code implementing the model at different levels of complexity to start exploring the best trade-off between numerical efficiency and the micro-arcsecond accuracy needed to be reached.

Fernando de Felice; Alberto Vecchiato; Maria Teresa Crosta; Mario G. Lattanzi; Beatrice Bucciarelli

2006-09-04T23:59:59.000Z

373

Local rules for protein folding on a triangular lattice and generalized hydrophobicity in the HP model  

SciTech Connect (OSTI)

A long standing problem in molecular biology is to determine the three-dimensional structure of a protein, given its amino acid sequence. A variety of simplifying models have been proposed abstracting only the {open_quotes}essential physical properties{close_quotes} of real proteins. In these models, the three dimensional space is often represented by a lattice. Residues which are adjacent in the primary sequence (i.e. covalently linked) must be placed at adjacent points in the lattice. A conformation of a protein is simply a self-avoiding walk along the lattice. The protein folding problem STRING-FOLD is that of finding a conformation of the protein sequence on the lattice such that the overall energy is minimized, for some reasonable definition of energy. This formulation leaves open the choices of a lattice and an energy function. Once these choices are made, one may then address the algorithmic complexity of optimizing the energy function for the lattice. For a variety of such simple models, this minimization problem is in fact NP-hard. In this paper, we consider the Hydrophobic-Polar (HP) Model introduced by Dill. The HP model abstracts the problem by grouping the 20 amino acids into two classes: hydrophobic (or non-polar) residues and hydrophilic (or polar) residues. For concreteness, we will take our input to be a string from (H,P){sup +}, where P represents polar residues, and H represents hydrophobic residues. Dill et.al. survey the literature analyzing this model. 8 refs., 2 figs., 1 tab.

Agarwala, R. [National Institutes of Health, Bethesda, MD (United States); Batzoglou, S. [MIT Lab. for Computer Science, Cambridge, MA (United States); Dancik, V. [Univ. of Southern California, Los Angeles, CA (United States)] [and others

1997-12-01T23:59:59.000Z

374

Description of FLIPSIM V: a General Firm Level Policy Simulation Model.  

E-Print Network [OSTI]

) determined by a OP which maximizes expected utility~ Expected net returns are ca1culated using a weighted average of past yields and prices, modified for relevant loan rates, target prices, expected disaster or crop insurance payments , and acreage set... in this section of the model are being planned. 5 The farm programs in the model are activated separately by options specified by the analyst. When the net loan rate (price support) for a crop is greater than its market price, the operator's share of the crop...

Richardson, James W.; Nixon, Clair J.

1986-01-01T23:59:59.000Z

375

An Isopycnal Box Model with predictive deep-ocean structure for biogeochemical cycling applications  

Science Journals Connector (OSTI)

To simulate global ocean biogeochemical tracer budgets a model must accurately determine both the volume and surface origins of each water-mass. Water-mass volumes are dynamically linked to the ocean circulation in General Circulation Models, but at the cost of high computational load. In computationally efficient Box Models the water-mass volumes are simply prescribed and do not vary when the circulation transport rates or water mass densities are perturbed. A new computationally efficient Isopycnal Box Model is presented in which the sub-surface box volumes are internally calculated from the prescribed circulation using a diffusive conceptual model of the thermocline, in which upwelling of cold dense water is balanced by a downward diffusion of heat. The volumes of the sub-surface boxes are set so that the density stratification satisfies an assumed link between diapycnal diffusivity, ?d, and buoyancy frequency, N: ?d = c/(N?), where c and ? are user prescribed parameters. In contrast to conventional Box Models, the volumes of the sub-surface ocean boxes in the Isopycnal Box Model are dynamically linked to circulation, and automatically respond to circulation perturbations. This dynamical link allows an important facet of ocean biogeochemical cycling to be simulated in a highly computationally efficient model framework.

Philip Goodwin

2012-01-01T23:59:59.000Z

376

A Generalizing Fuzzy Model for Shallow Cavity Flows Under Different Mach Regimes1  

E-Print Network [OSTI]

exploiting the fuzzy inference mechanisms. Fuzzy logic is a practical tool for expressing human expertise of the critically essential behavior observed at the cavity floor. I. INTRODUCTION Fuzzy Logic (FL) is a practical shedding model. The fuzzy system in [7] has been used to scale a control signal produced by a PID

Debiasi, Marco

377

An integrated life cycle quality model for general public market software products  

E-Print Network [OSTI]

. The requirements are built upon existing industry standards, including ISO 9001. The TL 9000 Quality System quality view of TL9000 Handbook and detailed view from ISO/IEC 1926 in the process of defining, measuring by TL9000-ISO complement model as well as by application process walk-through. Proceedings of Software

Suryn, Witold

378

A general model for effects of temperature on ectotherm ontogenetic growth and development  

Science Journals Connector (OSTI)

...earlier model for allocation of energy and biomass to growth on endotherms...new biomass and Q sto is energy stored in new biomass. To incorporate effects...and E d are the activation energies for biomass accumulation rate and development...

2012-01-01T23:59:59.000Z

379

A GENERALIZED ARRAY MANIFOLD MODEL FOR LOGAL SCATTERING IN WIRELESS COMMUNICATIONS  

E-Print Network [OSTI]

, S-100 44 Stockholm, Sweden 'Dept. of Elec. & Comp. Engineering, Brigham Young University, Provo, UT the conventional plane wave model. 1. INTRODUCTION The use of antenna arrays as a tool for improving coverage reduce radiated power require- ments, allow for multiple mobile co-channel users, and re- duce signal

Swindlehurst, A. Lee

380

A unifying explanation of primary generalized seizures through nonlinear brain modeling and bifurcation analysis  

E-Print Network [OSTI]

physiological processes such as propagation delays, membrane physiology and corticothalamic feedback. Previous set predicts a number of crucial dynamic processes, including the onset of periodic and chaotic-clonic and absence seizures are predicted and interrelated by the global bifurcation diagram of the model's dynamics

Note: This page contains sample records for the topic "general circulation models" 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

ENSO, Atlantic Climate Variability, and the Walker and Hadley Circulations  

Science Journals Connector (OSTI)

This chapter describes and discusses the Walker and Hadley circulations associated with the El Niño/Southern ... the Pacific Walker circulation, the western Pacific Hadley circulation, and the Atlantic Hadley cir...

Chunzai Wang

2004-01-01T23:59:59.000Z

382

Generalisation of Levine's prediction for the distribution of freezing temperatures of droplets: A general singular model for ice nucleation  

E-Print Network [OSTI]

Models without an explicit time dependence, called singular models, are widely used for fitting the distribution of temperatures at which water droplets freeze. In 1950 Levine developed the original singular model. His key assumption was that each droplet contained many nucleation sites, and that freezing occurred due to the nucleation site with the highest freezing temperature. The fact that freezing occurs due to the maximum value out of large number of nucleation temperatures, means that we can apply the results of what is called extreme-value statistics. This is the statistics of the extreme, i.e., maximum or minimum, value of a large number of random variables. Here we use the results of extreme-value statistics to show that we can generalise Levine's model to produce the most general singular model possible. We show that when a singular model is a good approximation, the distribution of freezing temperatures should always be given by what is called the generalised extreme-value distribution. In addition...

Sear, Richard P

2013-01-01T23:59:59.000Z

383

CIRCULATING MOVING BED COMBUSTION PROOF OF CONCEPT  

SciTech Connect (OSTI)

Circulating Moving Bed (CMB) combustion technology has its roots in traditional circulating fluidized bed technology and involves a novel method of solid fuel combustion and heat transfer. CMB technology represents a step change in improved performance and cost relative to conventional PC and FBC boilers. The CMB heat exchanger preheats the energy cycle working fluid, steam or air, to the high temperature levels required in systems for advanced power generation. Unique features of the CMB are the reduction of the heat transfer surfaces by about 60% as a result of the enhanced heat transfer rates, flexibility of operation, and about 30% lower cost over existing technology. The CMB Phase I project ran from July 2001 through March 2003. Its objective was to continue development of the CMB technology with a series of proof of concept tests. The tests were conducted at a scale that provided design data for scale up to a demonstration plant. These objectives were met by conducting a series of experiments in ALSTOM Power’s Multi-use Test Facility (MTF). The MTF was modified to operate under CMB conditions of commercial interest. The objective of the tests were to evaluate gas-to-solids heat transfer in the upper furnace, assess agglomeration in the high temperature CMB bubbling bed, and evaluate solids-to-tube heat transfer in the moving bed heat exchanger. The Phase I program results showed that there are still some significant technical uncertainties that needed to be resolved before the technology can be confidently scaled up for a successful demonstration plant design. Work remained in three primary areas: • scale up of gas to solid heat transfer • high temperature finned surface design • the overall requirements of mechanical and process design. The CMB Phase II workscope built upon the results of Phase I and specifically addressed the remaining technical uncertainties. It included a scaled MTF heat transfer test to provide the necessary data to scale up gas-to-solids heat transfer. A stress test rig was built and tested to provide validation data for a stress model needed to support high temperature finned surface design. Additional cold flow model tests and MTF tests were conducted to address mechanical and process design issues. This information was then used to design and cost a commercial CMB design concept. Finally, the MBHE was reconfigured into a slice arrangement and tested for an extended duration at a commercial CFB plant.

Jukkola, Glen

2010-06-30T23:59:59.000Z

384

Distinct Modes of Internal Variability in the Global Meridional Overturning Circulation Associated with the Southern Hemisphere Westerly Winds  

Science Journals Connector (OSTI)

The internal variability of the global meridional overturning circulation (GMOC) in long-term integration of the earth system model Community Earth System Models (COSMOS) is examined in this study. Two distinct modes of the GMOC, which are closely ...

Wei Wei; Gerrit Lohmann; Mihai Dima

2012-05-01T23:59:59.000Z

385

Brain insulin lowers circulating BCAA levels by inducing hepatic...  

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

Brain insulin lowers circulating BCAA levels by inducing hepatic BCAA catabolism. Brain insulin lowers circulating BCAA levels by inducing hepatic BCAA catabolism. Abstract:...

386

Observational evidence for poleward expansion of the Hadley circulation  

Science Journals Connector (OSTI)

How the Hadley circulation changes in response to global climate ... consistent and statistically significant poleward expansion of the Hadley circulation in the past few decades is ... independent observational ...

Yongyun Hu ???; Chen Zhou ? ?; Jiping Liu ???

2011-01-01T23:59:59.000Z

387

Generalized model of undercutting of involute spur gears generated by rack-cutters  

Science Journals Connector (OSTI)

Abstract In this work a generalized approach for defining the phenomenon undercutting of involute teeth is proposed, where besides the traditional boundary case, called undercutting — type I, additionally two more boundary cases, defined as undercutting of type \\{IIa\\} and type \\{IIb\\} are described. According to this approach, the traditional undercutting — type I is caused by the rectilinear profile of the rack-cutter and the non-traditional undercutting — type \\{IIa\\} and type \\{IIb\\} is caused by the rack-cutter fillet. The parametric equations of the so-called boundary fillets of the types \\{IIa\\} and \\{IIb\\} defining the area of existence of the rack-cutter fillet are drawn. Explicitly, an additional boundary condition for avoiding the undercutting of type \\{IIa\\} and type \\{IIb\\} is drawn. The maximum value of the radius of the rack-cutter fillet, at which there is no undercutting, is specified. Two types of quantitative indices for the estimation of the extent of undercutting of the teeth in a radial and tangential direction are defined.

Ognyan Alipiev; Sergey Antonov; Tanya Grozeva

2013-01-01T23:59:59.000Z

388

A general technology adoption model of solar photovoltaic under feed-in tariff policy incorporating learning and network effects  

Science Journals Connector (OSTI)

There is now a plethora of renewable energy policy instruments to support the adoption of renewable energy technology and the generation of renewable electricity. Different ways to characterize such policies have included whether these policies are Price driven or Quota (Quantity) driven generation based or capacity driven etc. All such incentive-based policies (vs. Command and control policies) attempt to correct market failure of under supply of renewable energy. This paper uses a technology adoption approach to study the feed-in tariff policy for the photovoltaic (PV) technology. We developed a general economic model to study the adoption incentive for smaller system under a feed-in tariff regime. The model incorporates both the learning effect of system cost and a negative network externality effect inherent in the feed-in tariff policy. The latter is due to that nonadopters would need to contribute to payment for adopters' electricity generation. Using numerical methods we demonstrated that the feed-in tariff model has the potential to exhibit bandwagon or accelerated adoption effects. Cost learning is key to contributing to this but network effects would serve to dampen it. Our model seems to able to explain the rapid growth pattern in PV systems installation capacity and generation in Germany during the growth period of 1999–2003. We explore some policy implications of the model and suggest future research directions.

2013-01-01T23:59:59.000Z

389

General Education GENERAL EDUCATION  

E-Print Network [OSTI]

, the pursuit of truth, the intellectual and ethical development of students, and the general well the consequences of human actions. E. Cross-Cultural Awareness Demonstrate the ability to critically compare

Stuart, Steven J.

390

Testing the Simple Biosphere Model (SiB) Using Point Micrometeorological and Biophysical Data  

Science Journals Connector (OSTI)

The Simple Biosphere model (SiB) of Sellers et al. (1986) was designed for use within General Circulation Models (GCMs) of the earth's atmosphere. The main objective of SiB is to provide a biophysically realistic description of those processes ...

P. J. Sellers; J. L. Dorman

1987-05-01T23:59:59.000Z

391

Dynamic simulation of a circulating fluidized bed boiler of low circulating ratio with wide particle size distributions  

SciTech Connect (OSTI)

A steady state model of a coal fired CFB boiler considering the hydrodynamics, heat transfer and combustion is presented. This model predicts the flue gas temperature, the chemical gas species (O{sub 2}, H{sub 2}O, CO, CO{sub 2} and SO{sub 2}) and char concentration distributions in both the axial and radial location along the furnace including the bottom and upper portion. The model was validated against experimental data generated in a 35 t/h commercial CFB boiler with low circulating ratio.

Lu Huilin; Yang Lidan; Bie Rushan; Zhao Guangbo

1999-07-01T23:59:59.000Z

392

Generalized second law of thermodynamics in the emergent universe for some viable models of f(T) gravity  

E-Print Network [OSTI]

The present study is motivated by the study of reference [1], where the generalized second law of thermodynamics has been investigated for a flat FRW universe for two viable models of $f(T)$ gravity. In the present work, we have considered a non-flat universe and accordingly studied the behaviors of equation of state parameter and deceleration parameter. Subsequently, using the first law of thermodynamics we derived the expressions for the time derivative of the total entropy of a universe enveloped by apparent horizon. In the next phase, with the choice of scale factor pertaining to an emergent universe we have investigated the sign of the time derivatives of total entropy for three viable models of $f(T)$ gravity.

Rahul Ghosh; Antonio Pasqua; Surajit Chattopadhyay

2012-07-24T23:59:59.000Z

393

Climatic response to large summertime injections of smoke into the atmosphere: changes in precipitation and the Hadley circulation  

SciTech Connect (OSTI)

An atmospheric general circulation model (AGCM) has been initialized with a 150 Tg summertime injection of smoke from post-war fires over Europe, Asia and North America. The smoke is subject to large-scale and convectice transport, dry deposition, coagulation and precipitation scavenging. The Hadley circulation is shown to respond in three stages. In the first stage, which lasts about one week depending on initial conditions, the Hadley circulation doubles in intensity. As the smoke spreads across the equator, and as the troposphere becomes more stable, the Hadley cell then weakens until it becomes actually weaker than in the control climate. In the final stage, as the smoke is removed, the Hadley cell gradually returns towards the control. Surface precipitation generally decreases as a result of the smoke. By the fourth week following the injection, zonal-mean surface precipitation in the tropics and summer hemisphere midlatitudes are about half of those in the control climate. The decrease is most notable over land, ocean precipitation being reduced only in the tropics. Penetrating convective precipitation is greatly reduced at all latitudes; large-scale precipitation is enhanced, becoming the dominant mode of precipitation in the simulation. Precipitation scavenging is shown to be the dominant removal process for particles larger than one micron in diameter. As a result, the lifetime of large particles increases several-fold due to the reduction in precipitation and the ''self-lofting'' of the smoke. For particles smaller than one micron in diameter, precipitation scavenging is found to be a much less efficient removal mechanism than both coagulation, which is important during the first week following the injection, and dry deposition at later times. 16 refs., 23 figs.

Ghan, S.J.; MacCracken, M.C.; Walton, J.J.

1985-08-01T23:59:59.000Z

394

Power/knowledge in an age of reform| General education teachers and discourses of disability.  

E-Print Network [OSTI]

?? In this qualitative study, comprised of interviews and observations, I explore how discourses of disability circulating within the epistemologies and practices of four general… (more)

Lightman, Timohty

2015-01-01T23:59:59.000Z

395

Reversing the Circulation of Magnetic Vortices  

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

Reversing the Circulation of Magnetic Vortices Print Reversing the Circulation of Magnetic Vortices Print In magnetic media, information is stored in binary form-one or zero, depending on which way the electronic spins are aligned in a given section of the medium. Recently, however, magnetic vortices have drawn scientists toward a new possibility: multibit storage in which each logic unit has four states instead of two and can store twice the information. Each tiny magnetic whirl has a polarity that can point up or down and a circulation that can be oriented clockwise or counterclockwise. Previous studies have shown that the polarity can be flipped on command. Now, using time-resolved magnetic soft x-ray microscopy at the ALS, researchers have shown for the first time how to use pulsed magnetic fields to reverse the circulation.

396

Reversing the Circulation of Magnetic Vortices  

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

Reversing the Circulation of Magnetic Vortices Print Reversing the Circulation of Magnetic Vortices Print In magnetic media, information is stored in binary form-one or zero, depending on which way the electronic spins are aligned in a given section of the medium. Recently, however, magnetic vortices have drawn scientists toward a new possibility: multibit storage in which each logic unit has four states instead of two and can store twice the information. Each tiny magnetic whirl has a polarity that can point up or down and a circulation that can be oriented clockwise or counterclockwise. Previous studies have shown that the polarity can be flipped on command. Now, using time-resolved magnetic soft x-ray microscopy at the ALS, researchers have shown for the first time how to use pulsed magnetic fields to reverse the circulation.

397

Reversing the Circulation of Magnetic Vortices  

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

Reversing the Circulation of Magnetic Vortices Print Reversing the Circulation of Magnetic Vortices Print In magnetic media, information is stored in binary form-one or zero, depending on which way the electronic spins are aligned in a given section of the medium. Recently, however, magnetic vortices have drawn scientists toward a new possibility: multibit storage in which each logic unit has four states instead of two and can store twice the information. Each tiny magnetic whirl has a polarity that can point up or down and a circulation that can be oriented clockwise or counterclockwise. Previous studies have shown that the polarity can be flipped on command. Now, using time-resolved magnetic soft x-ray microscopy at the ALS, researchers have shown for the first time how to use pulsed magnetic fields to reverse the circulation.

398

Reversing the Circulation of Magnetic Vortices  

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

Reversing the Circulation of Magnetic Vortices Print Reversing the Circulation of Magnetic Vortices Print In magnetic media, information is stored in binary form-one or zero, depending on which way the electronic spins are aligned in a given section of the medium. Recently, however, magnetic vortices have drawn scientists toward a new possibility: multibit storage in which each logic unit has four states instead of two and can store twice the information. Each tiny magnetic whirl has a polarity that can point up or down and a circulation that can be oriented clockwise or counterclockwise. Previous studies have shown that the polarity can be flipped on command. Now, using time-resolved magnetic soft x-ray microscopy at the ALS, researchers have shown for the first time how to use pulsed magnetic fields to reverse the circulation.

399

Reversing the Circulation of Magnetic Vortices  

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

Reversing the Circulation of Magnetic Vortices Print Reversing the Circulation of Magnetic Vortices Print In magnetic media, information is stored in binary form-one or zero, depending on which way the electronic spins are aligned in a given section of the medium. Recently, however, magnetic vortices have drawn scientists toward a new possibility: multibit storage in which each logic unit has four states instead of two and can store twice the information. Each tiny magnetic whirl has a polarity that can point up or down and a circulation that can be oriented clockwise or counterclockwise. Previous studies have shown that the polarity can be flipped on command. Now, using time-resolved magnetic soft x-ray microscopy at the ALS, researchers have shown for the first time how to use pulsed magnetic fields to reverse the circulation.

400

Ocean Currents and Circulation and Climate Change  

Science Journals Connector (OSTI)

The Atlantic Ocean, in particular its Meridional Overturning Circulation (MOC), is sensitive to the patterns of atmospheric forcing, in particular to that of the freshwater flux. Relatively small changes in at...

Henk A. Dijkstra

2014-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "general circulation models" 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

Circulation and convection in the Irminger Sea  

E-Print Network [OSTI]

Aspects of the circulation and convection in the Irminger Sea are investigated using a variety of in-situ, satellite, and atmospheric reanalysis products. Westerly Greenland tip jet events are intense, small-scale wind ...

Våge, Kjetil

2010-01-01T23:59:59.000Z

402

General matrix ENDOR line shape model applied to the methyl radical in lithium acetate dihydrate using single crystal data  

Science Journals Connector (OSTI)

A new general matrix ENDOR line shape model is tested against ENDOR data on the methyl radical in ??irradiated lithium acetate dihydrate. All parameters in the line shape model are determined or narrowly limited by experiment. These include the dipolar tensors of all protons within 5 Å of the methyl radical the microwave and radiofrequency magnetic fields and the electronic and nuclear spin–lattice and spin–spin relaxation times. The theoretical simulations agree satisfactorily with the experimental lineshape microwavemagnetic field dependence radiofrequency magnetic field dependence and angular variation of single crystalENDOR line intensities. The effective nuclear spin–lattice relaxation time is ?10 ms at 77 K and seems to be dominated by an angularly independent nuclear relaxation mechanism. The angularly dependent electron–nuclear dipolar interaction is found to be of much less importance for the ENDOR response. It is noted that the angular variation of ENDOR intensities is an important parameter to assess the nuclear relaxation mechanisms that control the ENDOR response. Data on cw and pulsed matrix ENDOR are compared and found to be similar. It is also shown that a model based on idealized line shape theory for disordered systems can satisfactorily reproduce matrix ENDOR line shapes. Both models allow calculation of the relative contributions from angularly independent and dependent ENDOR responses.

Larry Kevan; P. A. Narayana; K. Toriyama; M. Iwasaki

1979-01-01T23:59:59.000Z

403

The Atmospheric Circulation and Observable Properties of Non-Synchronously Rotating Hot Jupiters  

E-Print Network [OSTI]

We study the feasibility of observationally constraining the rotation rate of hot Jupiters, planets that are typically assumed to have been tidally locked into synchronous rotation. We use a three-dimensional General Circulation Model to solve for the atmospheric structure of two hot Jupiters (HD 189733b and HD 209458b), assuming rotation periods that are 0.5, 1, or 2 times their orbital periods (2.2 and 3.3 days, respectively), including the effect of variable stellar heating. We compare two observable properties: 1) the spatial variation of flux emitted by the planet, measurable in orbital phase curves, and 2) the net Doppler shift in transmission spectra of the atmosphere, which is tantalizingly close to being measurable in high-resolution transit spectra. Although we find little difference between the observable properties of the synchronous and non-synchronous models of HD 189733b, we see significant differences when we compare the models of HD 209458b. In particular, the slowly rotating model of HD 2094...

Rauscher, E

2014-01-01T23:59:59.000Z

404

Meridional circulation dynamics from 3D MHD global simulations of solar convection  

E-Print Network [OSTI]

The form of the solar meridional circulation is a very important ingredient for mean field flux transport dynamo models. Yet a shroud of mystery still surrounds this large-scale flow, given that its measurement using current helioseismic techniques is challenging. In this work we use results from 3D global simulations of solar convection to infer the dynamical behavior of the established meridional circulation. We make a direct comparison between the meridional circulation that arises in these simulations and the latest observations. Based on our results we argue that there should be an equatorward flow at the base of the convection zone at mid latitudes, below the current maximum depth helioseismic measures can probe (0.75 R). We also provide physical arguments to justify this behaviour. The simulations indicate that the meridional circulation undergoes substantial changes in morphology as the magnetic cycle unfolds. We close by discussing the importance of these dynamical changes for current methods of obse...

Passos, Dario; Miesch, Mark

2015-01-01T23:59:59.000Z

405

Constraining H{sub 0} in general dark energy models from Sunyaev-Zeldovich/X-ray technique and complementary probes  

SciTech Connect (OSTI)

In accelerating dark energy models, the estimates of the Hubble constant, H{sub 0}, from Sunyaev-Zel'dovich effect (SZE) and X-ray surface brightness of galaxy clusters may depend on the matter content (?{sub M}), the curvature (?{sub K}) and the equation of state parameter (?). In this article, by using a sample of 25 angular diameter distances of galaxy clusters described by the elliptical ? model obtained through the SZE/X-ray technique, we constrain H{sub 0} in the framework of a general ?CDM model (arbitrary curvature) and a flat XCDM model with a constant equation of state parameter ? = p{sub x}/?{sub x}. In order to avoid the use of priors in the cosmological parameters, we apply a joint analysis involving the baryon acoustic oscillations (BAO) and the CMB Shift Parameter signature. By taking into account the statistical and systematic errors of the SZE/X-ray technique we obtain for nonflat ?CDM model H{sub 0} = 74{sup +5.0}{sub ?4.0} km s{sup ?1} Mpc{sup ?1}(1?) whereas for a flat universe with constant equation of state parameter we find H{sub 0} = 72{sup +5.5}{sub ?4.0} km s{sup ?1} Mpc{sup ?1}(1?). By assuming that galaxy clusters are described by a spherical ? model these results change to H{sub 0} = 62{sup +8.0}{sub ?7.0} and H{sub 0} = 59{sup +9.0}{sub ?6.0} km s{sup ?1} Mpc{sup ?1}(1?), respectively. The results from elliptical description are in good agreement with independent studies from the Hubble Space Telescope key project and recent estimates based on the Wilkinson Microwave Anisotropy Probe, thereby suggesting that the combination of these three independent phenomena provides an interesting method to constrain the Hubble constant. As an extra bonus, the adoption of the elliptical description is revealed to be a quite realistic assumption. Finally, by comparing these results with a recent determination for a flat ?CDM model using only the SZE/X-ray technique and BAO, we see that the geometry has a very weak influence on H{sub 0} estimates for this combination of data.

Holanda, R.F.L.; Lima, J.A.S. [Departamento de Astronomia (IAGUSP), Universidade de São Paulo, Rua do Matão 1226, 05508-900, São Paulo, SP (Brazil); Cunha, J.V. [Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Rua Santa Adélia 166, 09210-170, Santo André, SP (Brazil); Marassi, L., E-mail: holanda@astro.iag.usp.br, E-mail: jvcunha@ufpa.br, E-mail: luciomarassi@ect.ufrn.br, E-mail: limajas@astro.iag.usp.br [Escola de Ciência e Tecnologia, UFRN, 59072-970, Natal, RN (Brazil)

2012-02-01T23:59:59.000Z

406

Cryogenic hydrogen circulation system of neutron source  

SciTech Connect (OSTI)

Cold neutron sources of reactors and spallation neutron sources are classic high flux neutron sources in operation all over the world. Cryogenic fluids such as supercritical or supercooled hydrogen are commonly selected as a moderator to absorb the nuclear heating from proton beams. By comparing supercritical hydrogen circulation systems and supercooled hydrogen circulation systems, the merits and drawbacks in both systems are summarized. When supercritical hydrogen circulates as the moderator, severe pressure fluctuations caused by temperature changes will occur. The pressure control system used to balance the system pressure, which consists of a heater as an active controller for thermal compensation and an accumulator as a passive volume controller, is preliminarily studied. The results may provide guidelines for design and operation of other cryogenic hydrogen system for neutron sources under construction.

Qiu, Y. N. [Institute of Physics and Chemistry, Chinese Academy of Sciences, BJ100190 China and University of Chinese Academy of Sciences, Chinese Academy of Sciences, BJ100049 (China); Hu, Z. J.; Wu, J. H.; Li, Q.; Zhang, Y. [Institute of Physics and Chemistry, Chinese Academy of Sciences, BJ100190 (China); Zhang, P. [School of Energy and Power Engineering, HuaZhong University of Science and Technology, WH430074 (China); Wang, G. P. [Institute of High Energy Physics, Chinese Academy of Sciences, BJ100049 (China)

2014-01-29T23:59:59.000Z

407

Circulating Fluidized Bed Combustion Boiler Project  

E-Print Network [OSTI]

or turndown so we delayed consideration of installation of a FBC boil r. CIRCULATING FBC In early 1980 we became aware of the work by the Ahlstrom Company of Helsinki, Finland in the development of the circulating FBC boiler design. The PYROFLOW... layer is a lightweight insulating refractory. In 1979, Ahlstrom started up a 45,000 pound per hour PYROFLOW unIt at Pihlava, Finland. In 1981, 200,000 pound per hour boiler was started up 1 Kauttua, Finland as le b se load steam supply for paper...

Farbstein, S. B.; Moreland, T.

1984-01-01T23:59:59.000Z

408

Aspects of circulating corticosterone in sea turtles  

E-Print Network [OSTI]

P. SPEC, S CF CIRCULATING COR1'ICOSTFRONE IN SEA TURTL:S R Thesis by NRN. I ' YNN SCHKRN ?ES Submi . tee to the G aduate College of Texas REM Universitv ir. partial ful llment of the requiremert for the uegree of eSTER OI' SCIENCE I.... Wickster lMember) msber! December 1986 ABSTRACT Aspects of Circulating Corticosterone in Sea Turtles. (December 1986) Nancy Lynn Schwantes, B. S. , University of Wisconsin Chairman of Advisory Committee: Dr. David Wm. Owens Naturally occurring...

Schwantes, Nancy Lynn

2012-06-07T23:59:59.000Z

409

The Role of North Atlantic Deep Water Formation in an OGCM’s Ventilation and Thermohaline Circulation  

Science Journals Connector (OSTI)

Two coarse-resolution model experiments are carried out on an OGCM to examine the effects of North Atlantic Deep Water (NADW) formation on the thermohaline circulation (THC) and ventilation timescales of the abyssal ocean. An idealized age tracer ...

Paul J. Goodman

1998-09-01T23:59:59.000Z

410

Simulation of processes in natural-circulation circuits of heat-recovery boilers of combined cycle power plants  

Science Journals Connector (OSTI)

Mathematical fundamentals of development of models of natural-circulation circuits of heat-recovery boilers are considered. Processes in the high-pressure circuit of a P-96 boiler are described.

E. K. Arakelyan; A. S. Rubashkin; A. S. Obuvaev; V. A. Rubashkin

2009-02-01T23:59:59.000Z

411

Review of the natural circulation effect in the Vermont Yankee spent-fuel pool  

SciTech Connect (OSTI)

A 7429-node, three-dimensional computer model of the Vermont Yankee spent-fuel pool was set up and run using the porous media model of the TEMPEST computer code. The results of this analysis show that natural circulation is sufficient to ensure adequate cooling, regardless of the loading pattern used or the orientation of the cooling system discharge nozzle.

Wheeler, C.L.

1988-01-01T23:59:59.000Z

412

DOE General Competencies  

Broader source: Energy.gov [DOE]

The DOE General Competencies are the personal and professional attributes that are critical to successful performance.  A competency model is a collection of competencies that together define...

413

Hamiltonian dynamics in extended phase space for gravity and its consistency with Lagrangian formalism: a generalized spherically symmetric model as an example  

E-Print Network [OSTI]

Among theoretical issues in General Relativity the problem of constructing its Hamiltonian formulation is still of interest. The most of attempts to quantize Gravity are based upon Dirac generalization of Hamiltonian dynamics for system with constraints. At the same time there exists another way to formulate Hamiltonian dynamics for constrained systems guided by the idea of extended phase space. We have already considered some features of this approach in the previous MG12 Meeting by the example of a simple isotropic model. Now we apply the approach to a generalized spherically symmetric model which imitates the structure of General Relativity much better. In particular, making use of a global BRST symmetry and the Noether theorem, we construct the BRST charge that generates correct gauge transformations for all gravitational degrees of freedom.

T. P. Shestakova

2013-03-06T23:59:59.000Z

414

North Atlantic sea-level and circulation  

Science Journals Connector (OSTI)

......6cm in the South Atlantic Bight compared to -4 cm north of...0 where overbar denotes a basin-wide average and 9 is measured...circulation changes in this closed basin, subject to the above assumptions...adjacent to the Mid-Atlantic Bight and Scotian Shelf is about 8......

Keith R. Thompson

1986-10-01T23:59:59.000Z

415

LHC sees particles circulate once more  

Science Journals Connector (OSTI)

... began circulating beams of protons around the 27-kilometre ring of the Large Hadron Collider (LHC) at CERN, Europe's particle-physics laboratory near Geneva, Switzerland. The tests bring ... at a press conference about the status of the machine. "We've shown the LHC is in superb condition." ...

Geoff Brumfiel

2009-11-23T23:59:59.000Z

416

DOPPLER SIGNATURES OF THE ATMOSPHERIC CIRCULATION ON HOT JUPITERS  

SciTech Connect (OSTI)

The meteorology of hot Jupiters has been characterized primarily with thermal measurements, but recent observations suggest the possibility of directly detecting the winds by observing the Doppler shift of spectral lines seen during transit. Motivated by these observations, we show how Doppler measurements can place powerful constraints on the meteorology. We show that the atmospheric circulation-and Doppler signature-of hot Jupiters splits into two regimes. Under weak stellar insolation, the day-night thermal forcing generates fast zonal jet streams from the interaction of atmospheric waves with the mean flow. In this regime, air along the terminator (as seen during transit) flows toward Earth in some regions and away from Earth in others, leading to a Doppler signature exhibiting superposed blueshifted and redshifted components. Under intense stellar insolation, however, the strong thermal forcing damps these planetary-scale waves, inhibiting their ability to generate jets. Strong frictional drag likewise damps these waves and inhibits jet formation. As a result, this second regime exhibits a circulation dominated by high-altitude, day-to-night airflow, leading to a predominantly blueshifted Doppler signature during transit. We present state-of-the-art circulation models including non-gray radiative transfer to quantify this regime shift and the resulting Doppler signatures; these models suggest that cool planets like GJ 436b lie in the first regime, HD 189733b is transitional, while planets hotter than HD 209458b lie in the second regime. Moreover, we show how the amplitude of the Doppler shifts constrains the strength of frictional drag in the upper atmospheres of hot Jupiters. If due to winds, the {approx}2 km s{sup -1} blueshift inferred on HD 209458b may require drag time constants as short as 10{sup 4}-10{sup 6} s, possibly the result of Lorentz-force braking on this planet's hot dayside.

Showman, Adam P.; Lewis, Nikole K. [Department of Planetary Sciences and Lunar and Planetary Laboratory, The University of Arizona, 1629 University Boulevard, Tucson, AZ 85721 (United States)] [Department of Planetary Sciences and Lunar and Planetary Laboratory, The University of Arizona, 1629 University Boulevard, Tucson, AZ 85721 (United States); Fortney, Jonathan J. [Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States)] [Department of Astronomy and Astrophysics, University of California, Santa Cruz, CA 95064 (United States); Shabram, Megan, E-mail: showman@lpl.arizona.edu [Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611-2055 (United States)] [Department of Astronomy, University of Florida, 211 Bryant Space Science Center, Gainesville, FL 32611-2055 (United States)

2013-01-01T23:59:59.000Z

417

Implementation of a generalized actuator disk wind turbine model into the weather research and forecasting model for large-eddy simulation applications  

Science Journals Connector (OSTI)

A generalized actuator disk (GAD) wind turbine parameterization designed for large-eddy simulation (LES) applications was implemented into the Weather Research and Forecasting (WRF) model. WRF-LES with the GAD model enables numerical investigation of the effects of an operating wind turbine on and interactions with a broad range of atmospheric boundary layer phenomena. Numerical simulations using WRF-LES with the GAD model were compared with measurements obtained from the Turbine Wake and Inflow Characterization Study (TWICS-2011) the goal of which was to measure both the inflow to and wake from a 2.3-MW wind turbine. Data from a meteorological tower and two light-detection and ranging (lidar) systems one vertically profiling and another operated over a variety of scanning modes were utilized to obtain forcing for the simulations and to evaluate characteristics of the simulated wakes. Simulations produced wakes with physically consistent rotation and velocity deficits. Two surface heat flux values of 20?W m?2 and 100?W m?2 were used to examine the sensitivity of the simulated wakes to convective instability. Simulations using the smaller heat flux values showed good agreement with wake deficits observed during TWICS-2011 whereas those using the larger value showed enhanced spreading and more-rapid attenuation. This study demonstrates the utility of actuator models implemented within atmospheric LES to address a range of atmospheric science and engineering applications. Validated implementation of the GAD in a numerical weather prediction code such as WRF will enable a wide range of studies related to the interaction of wind turbines with the atmosphere and surface.

J. D. Mirocha; B. Kosovic; M. L. Aitken; J. K. Lundquist

2014-01-01T23:59:59.000Z

418

Relationship Between Atmospheric circulation and Snowpack in theWestern United States  

SciTech Connect (OSTI)

Snow anomalies in the western United States (U.S.) have beenwidely investigated by many researchers due to its impact on wateravailability. This study focuses on how anomalous atmospheric circulationaffects snowpack accumulation in the western U.S. using observations andoutput from the National Center for Atmospheric Research (NCAR) CommunityClimate Model version 3 (CCM3). Our results indicate that themid-latitude atmospheric circulation anomalies induced by the ElNino-Southern Oscillation (ENSO) tend to drive winter precipitationshifts, leading to an anomalous snowpack distribution in the western U.S.The warm phase of ENSO produces increased snowpack in the Southwest,while the cold phase of ENSO generates increased snowpack in theNorthwest. Temperature has a secondary impact on the anomalous snowpackdistribution during ENSO episodes. Additionally, the non-linearatmospheric dynamics-related Pacific-North American (PNA) pattern isfound to strongly affect snow anomalies in the western U.S. independentfrom ENSO. The positive phase of the PNA pattern produces coldertemperature and stronger precipitation due to the lower pressure in theregion, leading to an above normal snowpack. Conversely, the negativephase of the PNA pattern generates warmer temperature and weakerprecipitation resulting from the higher pressure, producing a below thannormal snowpack in the western U.S. In general, the NCAR-CCM3 reproducesthe observed processes. However, model biases are identified andreported. The information provided in this study strengthens ourunderstanding of climate and water supply variability in the westernU.S.

Jin, Jiming; Miller, Norman L.; Sorooshian, Soroosh; Gao, Xiaogang

2004-06-02T23:59:59.000Z

419

Comparisons of model simulations of climate variability with data, Task 2  

SciTech Connect (OSTI)

Significant progress has been made in our investigations aimed at diagnosing low frequency variations of climate in General Circulation Models. We have analyzed three versions of the Oregon State University General Circulation Model (OSU GCM). These are: (1) the Slab Model in which the ocean is treated as a static heat reservoir of fixed depth, (2) the coupled upper ocean-atmosphere model in which the ocean dynamics are calculated in two layers of variable depths representing the mixed layers and the thermocline; this model is referred to OSU2 in the following discussion, and (3) the coupled full ocean-atmosphere model in which the ocean is represented by six layers of variable depth; this model is referred to as OSU6 GCM in the discussion.

Not Available

1990-01-01T23:59:59.000Z

420

Comparisons of model simulations of climate variability with data, Task 2. [Progress report  

SciTech Connect (OSTI)

Significant progress has been made in our investigations aimed at diagnosing low frequency variations of climate in General Circulation Models. We have analyzed three versions of the Oregon State University General Circulation Model (OSU GCM). These are: (1) the Slab Model in which the ocean is treated as a static heat reservoir of fixed depth, (2) the coupled upper ocean-atmosphere model in which the ocean dynamics are calculated in two layers of variable depths representing the mixed layers and the thermocline; this model is referred to OSU2 in the following discussion, and (3) the coupled full ocean-atmosphere model in which the ocean is represented by six layers of variable depth; this model is referred to as OSU6 GCM in the discussion.

Not Available

1990-12-31T23:59:59.000Z

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421

Boundary Layer Dynamics and Cross-Equatorial Hadley Circulation  

Science Journals Connector (OSTI)

The behavior of the Hadley circulation is analyzed in the context of an idealized axisymmetric atmosphere. It is argued that the cross-equatorial Hadley circulation exhibits two different regimes depending on the depth of the planetary boundary ...

Olivier Pauluis

2004-05-01T23:59:59.000Z

422

Dynamics of zonal-mean flow assimilation and implications for winter circulation anomalies  

SciTech Connect (OSTI)

Seasonally averaged 200-mb circulations for recent winters (1987/88 and 1988/89) that represent opposite phases of El Nino and a zonal-mean zonal flow index cycle are diagnosed using data assimilated by the Goddard Earth Observing System (GEOS) and operational analyses of the European Centre for Medium-Range Weather Forecasts (ECMWF). The comparison is undertaken to determine whether there are significant differences in the 200-mb vorticity dynamics implied by the mean meridional circulations in the two datasets and whether these differences can be related to the Incremental Analysis Update (IAU) method used in the GEOS assimilation. The two datasets show a high degree of similarity in their depictions of the large-scale rotational flow, but there are substantial differences in the associated divergent circulations. For the zonal-mean flow, the zonal winds are substantially the same, but the meridional wind in the Tropics and subtropics is considerably weaker in the GEOS assimilation than its counterparts in both the ECMWF data and the GEOS analyses used to produce the assimilation. The authors examine the assimilation of the Hadley circulation using a zonally symmetric f-plane model. For this model, the IAU method easily assimilates the rotational flow but fails to assimilate the divergent circulation. This deficiency of the IAU method may explain the weakness of the Hadley cell in the GEOS assimilation. For this simple model, an alternative assimilation method, based on constraints imposed by the analyzed potential vorticity and mean meridional circulation fields, is proposed that simultaneously assimilates both rotational and divergent flow components. Barotropic modeling suggests that an accurate representation of mean meridional flow anomalies can be important for the diagnosis of both zonal-mean and eddy rotational flow perturbations, particularly during extreme phases of the zonal-mean zonal flow fluctuation. 22 refs., 10 figs.

DeWeaver, E.; Nigam, S. [Univ. of Maryland, College Park, MD (United States)] [Univ. of Maryland, College Park, MD (United States)

1997-07-01T23:59:59.000Z

423

The middle-atmosphere Hadley circulation and equatorial inertial  

E-Print Network [OSTI]

The middle-atmosphere Hadley circulation and equatorial inertial adjustment 1234567 89A64BC7DEF72B4 S 2001 American Meteorological Society 3077 The Middle-Atmosphere Hadley Circulation and Equatorial toward a balanced state results in a type of Hadley circulation that lies outside the ``downward control

Wirosoetisno, Djoko

424

Simulation of barotropic wind-driven circulation in the upper layers of Bay of Bengal and Andaman Sea during the southwest and northeast monsoon seasons using observed winds  

Science Journals Connector (OSTI)

A two-dimensional, nonlinear, vertically integrated model was used to simulate depth-mean wind-driven circulation in the upper Ekman layers of the Bay of Bengal and Andaman Sea. The model resolution was one th...

N. Bahulayan; A. S. Unnikrishnan

1992-03-01T23:59:59.000Z

425

Natural circulation in simulated LMFBR fuel assemblies  

SciTech Connect (OSTI)

Natural circulation experiments have been performed using simulated liquid metal fast breeder reactor fuel assemblies in the Thermal-Hydraulic Out-of-Reactor Safety (THORS) facility, an engineering-scale sodium loop. Objective of these tests has been to provide experimental data under conditions that might be encountered during a partial or total loss of the shutdown heat removal system (SHRS) in a reactor. The experiments have included single- and two-phase tests under quasi-steady and transient conditions, at both nominal and non-nominal system conditions. Results from these test indicate that the potential for reactor damage during degraded SHRS operation is extremely slight, and that natural circulation can be a major contributor to safe operation of the system in both single- and two-phase flow during such operation.

Levin, A.E.; Carbajo, J.J.; Lloyd, D.B.; Montgomery, B.H.; Rose, S.D.; Wantland, J.L.

1985-01-01T23:59:59.000Z

426

Validity of the Generalized Second Law of Thermodynamics of the Universe Bounded by the Event Horizon in Holographic Dark Energy Model  

E-Print Network [OSTI]

In this letter, we investigate the validity of the generalized second law of thermodynamics of the universe bounded by the event horizon in the holographic dark energy model. The universe is chosen to be homogeneous and isotropic and the validity of the first law has been assumed here. The matter in the universe is taken in the form of non-interacting two fluid system- one component is the holographic dark energy model and the other component is in the form of dust.

Nairwita Mazumder; Subenoy Chakraborty

2010-05-19T23:59:59.000Z

427

Locating and identifying codes in circulant networks  

Science Journals Connector (OSTI)

A set S of vertices of a graph G is a dominating set of G if every vertex u of G is either in S or it has a neighbour in S. In other words, S is dominating if the sets S@?N[u] where u@?V(G) and N[u] denotes the closed neighbourhood of u in G, are all ... Keywords: Circulant network, Domination, Identifying code, Locating code, Locating-dominating set

M. Ghebleh; L. Niepel

2013-09-01T23:59:59.000Z

428

Dynamic analysis of a circulating fluidized bed riser  

SciTech Connect (OSTI)

A linear state model is proposed to analyze dynamic behavior of a circulating fluidized bed riser. Different operating regimes were attained with high density polyethylene beads at low and high system inventories. The riser was operated between the classical choking velocity and the upper transport velocity demarcating fast fluidized and transport regimes. At a given riser superficial gas velocity, the aerations fed at the standpipe were modulated resulting in a sinusoidal solids circulation rate that goes into the riser via L-valve. The state model was derived based on the mass balance equation in the riser. It treats the average solids fraction across the entire riser as a state variable. The total riser pressure drop was modeled using Newton’s second law of motion. The momentum balance equation involves contribution from the weight of solids and the wall friction caused by the solids to the riser pressure drop. The weight of solids utilizes the state variable and hence, the riser inventory could be easily calculated. The modeling problem boils down to estimating two parameters including solids friction coefficient and time constant of the riser. It has been shown that the wall friction force acts in the upward direction in fast fluidized regime which indicates that the solids were moving downwards on the average with respect to the riser wall. In transport regimes, the friction acts in the opposite direction. This behavior was quantified based on a sign of Fanning friction factor in the momentum balance equation. The time constant of the riser appears to be much higher in fast fluidized regime than in transport conditions.

Panday, Rupen [REM Engineering PLLC; Shadle, Lawrence J. [U.S. DOE; Guenther, Chris [U.S. DOE

2012-01-01T23:59:59.000Z

429

JOURNAL OF GEOPHYSICAL RESEARCH, VOL. ???, XXXX, DOI:10.1029/, Smoluchowski Coagulation Models Of Sea Ice Thickness1  

E-Print Network [OSTI]

and insulating properties. Inclusion of a dynamic sea-ice component in General25 Circulation Models (GCMs Of Sea Ice Thickness1 Distribution Dynamics2 D. Godlovitch,1 R. Illner,2 and A. Monahan,1 D. Godlovitch ICE Abstract. Sea ice thickness distributions display a ubiquitous exponential de-3 crease

Illner, Reinhard

430

Evaluation of the Simulated Interannual and Subseasonal Variability in an AMIP-Style Simulation Using the CSU Multiscale Modeling Framework  

E-Print Network [OSTI]

Framework (MMF) is a new type of general circulation model (GCM) that replaces the conventional precipita- tion associated with the Indian and Asian monsoon seasons, precipitation deficits west, especially in the tropics. The geographical pattern of the seasonal cycle of precipitation is well reproduced

Collett Jr., Jeffrey L.

431

The Impact of Subtidal Circulation on Internal-Tide-Induced Mixing in the Philippine Sea  

Science Journals Connector (OSTI)

This study uses a primitive equation model to estimate the time-varying M2 internal tide dissipation in the Philippine Sea in the presence of the subtidal circulation. The time-mean diapycnal diffusivity due to the M2 internal tide is estimated to ...

Colette G. Kerry; Brian S. Powell; Glenn S. Carter

2014-12-01T23:59:59.000Z

432

Conservative solute approximation to the transport of a remedial reagent in a vertical circulation flow field  

Science Journals Connector (OSTI)

Summary This study presents a novel mathematical model for describing the transport of the remedial reagent in a vertical circulation flow field in an anisotropic aquifer. To develop the mathematical model, the radial and vertical components of the pore water velocity are calculated first by using an analytical solution for steady-state drawdown distribution near a vertical circulation well. Next, the obtained radial and vertical components of the pore water velocity are then incorporated into a three-dimensional axisymmetrical advection–dispersion equation in cylindrical coordinates from which to build the reagent transport equation. The Laplace transform finite difference technique is applied to solve the three-dimensional axisymmetrical advection–dispersion equation with spatial variable-dependent coefficients. The developed mathematical model is used to investigate the effects of various parameters such as hydraulic conductivity anisotropy, longitudinal and transverse dispersivities, the placement of the extraction and injection screened intervals of the vertical circulation well and the injection modes on the transport regime of the remedial reagent. Results show that those parameters have different degrees of impacts on the distribution of the remedial reagent. The mathematical model provides an effective tool for designing and operating an enhanced groundwater remediation in an anisotropic aquifer using the vertical circulation well technology.

Jui-Sheng Chen; Cheng-Shin Jang; Chung-Ting Cheng; Chen-Wuing Liu

2010-01-01T23:59:59.000Z

433

Contribution of Atmospheric Circulation to Inception of the Laurentide Ice Sheet at 116 kyr BP*  

E-Print Network [OSTI]

Contribution of Atmospheric Circulation to Inception of the Laurentide Ice Sheet at 116 kyr BP of the Laurentide Ice Sheet is investigated using the Community Land Model, version 3 (CLM3) with bias-corrected 40 cold and persistent summer air temperatures in the contemporary climate do not produce perennial snow

Howat, Ian M.

434

The 1997/98 El Nino: A Test for Climate Models  

SciTech Connect (OSTI)

Version 3 of the Hadley Centre Atmospheric Model (HadAM3) has been used to demonstrate one means of comparing a general circulation model with observations for a specific climate perturbation, namely the strong 1997/98 El Nino. This event was characterized by the collapse of the tropical Pacific's Walker circulation, caused by the lack of a zonal sea surface temperature gradient during the El Nino. Relative to normal years, cloud altitudes were lower in the western portion of the Pacific and higher in the eastern portion. HadAM3 likewise produced the observed collapse of the Walker circulation, and it did a reasonable job of reproducing the west/east cloud structure changes. This illustrates that the 1997/98 El Nino serves as a useful means of testing cloud-climate interactions in climate models.

Lu, R; Dong, B; Cess, R D; Potter, G L

2004-03-05T23:59:59.000Z

435

Generalized Galilean Genesis  

E-Print Network [OSTI]

The galilean genesis scenario is an alternative to inflation in which the universe starts expanding from Minkowski in the asymptotic past by violating the null energy condition stably. Several concrete models of galilean genesis have been constructed so far within the context of galileon-type scalar-field theories. We give a generic, unified description of the galilean genesis scenario in terms of the Horndeski theory, i.e., the most general scalar-tensor theory with second-order field equations. In doing so we generalize the previous models to have a new parameter (denoted by {\\alpha}) which results in controlling the evolution of the Hubble rate. The background dynamics is investigated to show that the generalized galilean genesis solution is an attractor, similarly to the original model. We also study the nature of primordial perturbations in the generalized galilean genesis scenario. In all the models described by our generalized genesis Lagrangian, amplification of tensor perturbations does not occur as ...

Nishi, Sakine

2015-01-01T23:59:59.000Z

436

Phase structure of a generalized Nambu Jona-Lasinio model with Wilson fermions in the mean field or large $N$-expansion  

E-Print Network [OSTI]

We analyze the vacuum structure of a generalized lattice Nambu--Jona-Lasinio model with two flavors of Wilson fermions, such that its continuum action is the most general four-fermion action with 'trivial' color interactions, and having a $SU(2)_V x SU(2)_A$ symmetry in the chiral limit. The phase structure of this model in the space of the two four-fermion couplings shows, in addition to the standard Aoki phases, new phases with $ != 0$, in close analogy to similar results recently suggested by some of us for lattice QCD with two degenerate Wilson fermions. This result shows how the phase structure of an effective model for low energy QCD cannot be entirely understood from Wilson Chiral Perturbation Theory, based on the standard QCD chiral effective Lagrangian approach.

V. Azcoiti; G. Di Carlo; E. Follana; M. Giordano; A. Vaquero

2013-05-08T23:59:59.000Z

437

Statefinder and Om Diagnostics for Interacting New Holographic Dark Energy Model and Generalized Second Law of Thermodynamics  

E-Print Network [OSTI]

In this work, we have considered that the flat FRW universe is filled with the mixture of dark matter and the new holographic dark energy. If there is an interaction, we have investigated the natures of deceleration parameter, statefinder and $Om$ diagnostics. We have examined the validity of the first and generalized second laws of thermodynamics under these interactions on the event as well as apparent horizon. It has been observed that the first law is violated on the event horizon. However, the generalized second law is valid throughout the evolution of the universe enveloped by the apparent horizon. When the event horizon is considered as the enveloping horizon, the generalized second law is found to break down excepting at late stage of the universe.

Ujjal Debnath; Surajit Chattopadhyay

2011-02-01T23:59:59.000Z

438

EIS-0289: JEA Circulating Fluidized Bed Combustor Project | Department of  

Broader source: Energy.gov (indexed) [DOE]

289: JEA Circulating Fluidized Bed Combustor Project 289: JEA Circulating Fluidized Bed Combustor Project EIS-0289: JEA Circulating Fluidized Bed Combustor Project SUMMARY This EIS assesses environmental issues associated with constructing and demonstrating a project that would be cost-shared by DOE and JEA (formerly the Jacksonville Electric Authority) under the Clean Coal Technology Program. PUBLIC COMMENT OPPORTUNITIES None available at this time. DOCUMENTS AVAILABLE FOR DOWNLOAD December 7, 2000 EIS-0289: Record of Decision JEA Circulating Fluidized Bed Combustor Project, Jacksonville, Duval County, FL June 1, 2000 EIS-0289: Final Environmental Impact Statement JEA Circulating Fluidized Bed Combustor Project August 1, 1999 EIS-0289: Draft Environmental Impact Statement JEA Circulating Fluidized Bed Combustor

439

Introduction: General Landslide Studies  

Science Journals Connector (OSTI)

Highlights for several papers included in the “general landslide” session for the 3rd World Landslide Forum are presented. Topics range from early warning systems and modelling to geomorphology and solid waste...

Peter Bobrowsky; Yueping Yin…

2014-01-01T23:59:59.000Z

440

Auto-Baecklund transformation and new exact solutions of the generalized variable-coefficients two-dimensional Korteweg-de Vries model  

SciTech Connect (OSTI)

Describing plasma physics, cluster physics, and geophysical fluid dynamics, a generalized variable-coefficient two-dimensional Korteweg-de Vries (GVCKdV) model is hereby under investigation. In this paper, an extended-variable-coefficient homogeneous balance method with symbolic computation is used to obtain an auto-Baecklund transformation, some rational solutions, and new soliton-type solutions for the GVCKdV model. The solutions of the well-known cylindrical Kadomtsev-Petviashvili equation can be recovered as special cases of the results obtained here.

Li Yezhou; Liu Jianguo [School of Science, Beijing University of Posts and Telecommunications, P.O. Box 91, Beijing 100876 (China)

2007-02-15T23:59:59.000Z

Note: This page contains sample records for the topic "general circulation models" 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

Isomorphism testing for circulant graphs Cn(a, b)  

E-Print Network [OSTI]

Isomorphism testing for circulant graphs Cn(a, b). Sara Nicoloso ?. Ugo Pietropaoli †. March 10, 2010. Abstract. In this paper we focus on connected ...

2010-03-10T23:59:59.000Z

442

Fluid Circulation and Heat Extraction from Engineered Geothermal...  

Open Energy Info (EERE)

from Engineered Geothermal Reservoirs Abstract A large amount of fluid circulation and heat extraction (i.e., thermal power production) research and testing has been conducted...

443

Linear and Non Linear Analysis of the Hadley Circulation  

Science Journals Connector (OSTI)

We present a synthesis of results obtained with the linear stability of the one-cell Hadley circulation. This flow is observe in the...

P. Laure; B. Roux

1990-01-01T23:59:59.000Z

444

General Thermodynamics  

Science Journals Connector (OSTI)

... principally in the Journal of the Franklin Institute. These ideas relate to a study of thermodynamics from what the author calls a generalized point of view, which concerns itself with ... from what the author calls a generalized point of view, which concerns itself with the thermodynamics of metastable states and irreversible processes as wall as with the stable states and reversible ...

R. W. HAYWOOD

1956-06-02T23:59:59.000Z

445

Development of a general purpose subgrid wall boiling model from improved physical understanding for use in computational fluid dynamics  

E-Print Network [OSTI]

Advanced modeling capabilities were developed for application to subcooled flow boiling through this work. The target was to introduce, and demonstrate, all necessary mechanisms required to accurately predict the temperature ...

Gilman, Lindsey Anne

2014-01-01T23:59:59.000Z

446

Thermodynamics of atmospheric circulation on hot Jupiters  

E-Print Network [OSTI]

Atmospheric circulation on tidally-locked exoplanets is driven by the absorption and reradiation of heat from the host star. They are natural heat engines, converting heat into mechanical energy. A steady state is possible only if there is a mechanism to dissipate mechanical energy, or if the redistribution of heat is so effective that the Carnot efficiency is driven to zero. Simulations based on primitive, equivalent-barotropic, or shallow-water equations without explicit provision for dissipation of kinetic energy and for recovery of that energy as heat, violate energy conservation. More seriously perhaps, neglect of physical sources of drag may overestimate wind speeds and rates of advection of heat from the day to the night side.

J. Goodman

2008-10-07T23:59:59.000Z

447

Next: effect of eddies on the Hadley circulation We talked about ways to incorporate eddy heat fluxes  

E-Print Network [OSTI]

Next: effect of eddies on the Hadley circulation We talked about ways to incorporate eddy heat ¡ An eddy-driven Hadley cell model #12;Effect of eddy fluxes Compare the dry dynamical core model run axisymmetrically versus with eddies ¡ Hadley cell is significantly stronger with eddies ¡ Suggests eddies

Frierson, Dargan

448

Do Coupled Climate Models Correctly SImulate the Upward Branch of the Deept Ocean Global Conveyor?  

SciTech Connect (OSTI)

The large-scale meridional overturning circulation (MOC) connects the deep ocean, a major reservoir of carbon, to the other components of the climate system and must therefore be accurately represented in Earth System Models. Our project aims to address the specific question of the pathways and mechanisms controlling the upwelling branch of the MOC, a subject of significant disagreement between models and observational syntheses, and among general circulation models. Observations of these pathways are limited, particularly in regions of complex hydrography such as the Southern Ocean. As such, we rely on models to examine theories of the overturning circulation, both physically and biogeochemically. This grant focused on a particular aspect of the meridional overturning circulation (MOC) where there is currently significant disagreement between models and observationally based analyses of the MOC, and amongst general circulation models. In particular, the research focused on addressing the following questions: 1. Where does the deep water that sinks in the polar regions rise to the surface? 2. What processes are responsible for this rise? 3. Do state-of-the-art coupled GCMs capture these processes? Our research had three key components: observational synthesis, model development and model analysis. In this final report we outline the key results from these areas of research for the 2007 to 2012 grant period. The research described here was carried out primarily by graduate student, Daniele Bianchi (now a Postdoc at McGill University, Canada), and Postdoc Stephanie Downes (now a Research Fellow at The Australian national University, Australia). Additional support was provided for programmers Jennifer Simeon as well as Rick Slater.

Sarmiento, Jorge L; Downes, Stephanie; Bianchi, Daniele

2013-01-17T23:59:59.000Z

449

Neoclassical Drift of Circulating Orbits Due toToroidal Electric Field in Tokamaks  

SciTech Connect (OSTI)

In tokamaks, Ware pinch is a well known neoclassical effect for trapped particles in response to a toroidal electric field. It is generally believed that there exists no similar neoclassical effect for circulating particles without collisions. However, this belief is erroneous, and misses an important effect. We show both analytically and numerically that under the influence of a toroidal electric field parallel to the current, the circulating orbits drift outward toward the outer wall with a characteristic velocity O ({var_epsilon}{sup -1}) larger than the E x B velocity, where {var_epsilon} is the inverse aspect-ratio of a tokamak. During a RF overdrive, the toroidal electric field is anti-parallel to the current. As a consequence, all charged particles, including backward runaway electrons, will drift inward towards the inner wall.

Hong, Qin, Xiaoyin Guan and Nathaniel J. Fisch

2011-07-19T23:59:59.000Z

450

Uncertainty quantification for large-scale ocean circulation predictions.  

SciTech Connect (OSTI)

Uncertainty quantificatio in climate models is challenged by the sparsity of the available climate data due to the high computational cost of the model runs. Another feature that prevents classical uncertainty analyses from being easily applicable is the bifurcative behavior in the climate data with respect to certain parameters. A typical example is the Meridional Overturning Circulation in the Atlantic Ocean. The maximum overturning stream function exhibits discontinuity across a curve in the space of two uncertain parameters, namely climate sensitivity and CO{sub 2} forcing. We develop a methodology that performs uncertainty quantificatio in the presence of limited data that have discontinuous character. Our approach is two-fold. First we detect the discontinuity location with a Bayesian inference, thus obtaining a probabilistic representation of the discontinuity curve location in presence of arbitrarily distributed input parameter values. Furthermore, we developed a spectral approach that relies on Polynomial Chaos (PC) expansions on each sides of the discontinuity curve leading to an averaged-PC representation of the forward model that allows efficient uncertainty quantification and propagation. The methodology is tested on synthetic examples of discontinuous data with adjustable sharpness and structure.

Safta, Cosmin; Debusschere, Bert J.; Najm, Habib N.; Sargsyan, Khachik

2010-09-01T23:59:59.000Z

451

Dynamical constraints on monsoon circulations R. Alan Plumb  

E-Print Network [OSTI]

into the broader context of the theory of tropical dynamics. The widely accepted paradigm for the tropical Hadley troposphere, assumed inviscid, creating uniform absolute angular momentum right across the Hadley cell. To some extent, monsoon circulations form a part of the seasonal Hadley circulation. This is especially

452

Single-Column Modeling  

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

C.J. Somerville and S. F. lacobellis C.J. Somerville and S. F. lacobellis Climate Research Division Scripps Institution of Oceanography University of California, San Diego La Jolla, CA 92093-0224 Our project is centered around a computationally efficient and economical one-dimensional (vertical) model, resembling a single column of a general circulation model (GCM) grid, applied to the experimental site of the Atmospheric Radiation Measurement (ARM) Program. The model contains a full set of modern GCM parameterizations of subgrid physical processes. To force the model, the advective terms in the budget equations are specified observationally from operational numerical weather prediction analyses. These analyses, based on four-dimensional data assimilation techniques, provide dynamically consistent wind fields and horizontal gradients

453

Separating expansion from contraction in spherically symmetric models with a perfect-fluid: Generalization of the Tolman-Oppenheimer-Volkoff condition and application to models with a cosmological constant  

E-Print Network [OSTI]

We investigate spherically symmetric perfect-fluid spacetimes and discuss the existence and stability of a dividing shell separating expanding and collapsing regions. We perform a 3+1 splitting and obtain gauge invariant conditions relating the intrinsic spatial curvature of the shells to the Misner-Sharp mass and to a function of the pressure that we introduce and that generalizes the Tolman-Oppenheimer-Volkoff equilibrium condition. We find that surfaces fulfilling those two conditions fit, locally, the requirements of a dividing shell and we argue that cosmological initial conditions should allow its global validity. We analyze the particular cases of the Lema\\^itre-Tolman-Bondi dust models with a cosmological constant as an example of a cold dark matter model with a cosmological constant (\\Lambda-CDM) and its generalization to contain a central perfect-fluid core. These models provide simple, but physically interesting illustrations of our results.

José Pedro Mimoso; Morgan Le Delliou; Filipe C. Mena

2010-06-14T23:59:59.000Z

454

Chapter Eight - Intrinsically Disordered Proteins—Relation to General Model Expressing the Active Role of the Water Environment  

Science Journals Connector (OSTI)

Abstract This work discusses the role of unstructured polypeptide chain fragments in shaping the protein's hydrophobic core. Based on the “fuzzy oil drop” model, which assumes an idealized distribution of hydrophobicity density described by the 3D Gaussian, we can determine which fragments make up the core and pinpoint residues whose location conflicts with theoretical predictions. We show that the structural influence of the water environment determines the positions of disordered fragments, leading to the formation of a hydrophobic core overlaid by a hydrophilic mantle. This phenomenon is further described by studying selected proteins which are known to be unstable and contain intrinsically disordered fragments. Their properties are established quantitatively, explaining the causative relation between the protein's structure and function and facilitating further comparative analyses of various structural models.

Barbara Kalinowska; Mateusz Banach; Leszek Konieczny; Damian Marchewka; Irena Roterman

2014-01-01T23:59:59.000Z

455

A reaction-based paradigm to model reactive chemical transport in groundwater with general kinetic and equilibrium reactions  

SciTech Connect (OSTI)

This paper presents a reaction-based water quality transport model in subsurface flow systems. Transport of chemical species with a variety of chemical and physical processes is mathematically described by M partial differential equations (PDEs). Decomposition via Gauss-Jordan column reduction of the reaction network transforms M species reactive transport equations into two sets of equations: a set of thermodynamic equilibrium equations representing NE equilibrium reactions and a set of reactive transport equations of M-NE kinetic-variables involving no equilibrium reactions (a kinetic-variable is a linear combination of species). The elimination of equilibrium reactions from reactive transport equations allows robust and efficient numerical integration. The model solves the PDEs of kinetic-variables rather than individual chemical species, which reduces the number of reactive transport equations and simplifies the reaction terms in the equations. A variety of numerical methods are investigated for solving the coupled transport and reaction equations. Simulation comparisons with exact solutions were performed to verify numerical accuracy and assess the effectiveness of various numerical strategies to deal with different application circumstances. Two validation examples involving simulations of uranium transport in soil columns are presented to evaluate the ability of the model to simulate reactive transport with complex reaction networks involving both kinetic and equilibrium reactions.

Zhang, Fan [ORNL; Yeh, Gour-Tsyh [University of Central Florida, Orlando; Parker, Jack C [ORNL; Brooks, Scott C [ORNL; Pace, Molly [ORNL; Kim, Young Jin [ORNL; Jardine, Philip M [ORNL; Watson, David B [ORNL

2007-01-01T23:59:59.000Z

456

Generalized SAFT-DFT/DMT Model for the Thermodynamic, Interfacial, and Transport Properties of Associating Fluids:? Application for n-Alkanols  

Science Journals Connector (OSTI)

Generalized SAFT-DFT/DMT Model for the Thermodynamic, Interfacial, and Transport Properties of Associating Fluids:? Application for n-Alkanols ... We have developed a “global” crossover (GC) statistical associating fluid theory (SAFT) equation of state (EOS) for associating fluids that incorporates nonanalytic scaling laws in the critical region and in the limit of low densities, ? ? 0, is transformed into the ideal-gas equation EOS. ... Unlike the crossover SAFT EOS developed earlier, the new GC SAFT EOS contains a so-called kernel term and reproduces the asymptotic scaling behavior of the isochoric heat capacity in the one- and two-phase regions. ...

S. B. Kiselev; J. F. Ely; I. M. Abdulagatov; M. L. Huber

2005-07-02T23:59:59.000Z

457

General Information  

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

ASD General Information ASD General Information APS Resources & Information A list of useful links for APS staff and users. APS Technical Publications Links to APS technical publications. APS Publications Database The official and comprehensive source of references for APS-related journal articles, conference papers, book chapters, dissertations, abstracts, awards, invited talks, etc. Image Library A collection of APS images. Responsibilities & Interfaces for APS Technical Systems Descriptions of the responsibilities of APS technical groups and how they interface with one another. APS Procedures Operational procedures for the APS. APS Specifications Specifications and approvals for upgrades or changes to existing APS hardware and software. APS Radiation Safety Policy & Procedures Committee Minutes

458

Loading capability of HVDC transformer bushings with restricted oil circulation for use in HVDC valve halls  

SciTech Connect (OSTI)

The loading capability of a 500 kV HVDC transformer bushing is calculated with some unusual conditions: the internal oil circulation in the bushing is blocked at the flange level and the ambient air temperature is raised to 60 C. The theoretical model was verified with a full-scale heat run test on a 7.8 m long bushing. A 220 m[sup 3] insulated test chamber was required to enclose the test set-up.

Johansson, L.; Magnuson, B. (ABB Components AB, Ludvika (Sweden)); Riffon, P. (Hydro-Quebec, Montreal, Quebec (Canada))

1993-07-01T23:59:59.000Z

459

Singularities of Generalized Parton Distributions  

SciTech Connect (OSTI)

Progress of recent work on modeling generalized parton distributions is given. Special attention was paid to study of their singularities structure.

Radyushkin, Anatoly V. [JLAB, Old Dominion U.

2013-05-01T23:59:59.000Z

460

Locating and identifying codes in circulant networks  

Science Journals Connector (OSTI)

Abstract A set S of vertices of a graph G is a dominating set of G if every vertex u of G is either in S or it has a neighbour in  S . In other words, S is dominating if the sets S ? N [ u ] where u ? V ( G ) and N [ u ] denotes the closed neighbourhood of u in G , are all nonempty. A set S ? V ( G ) is called a locating code in G , if the sets S ? N [ u ] where u ? V ( G ) ? S are all nonempty and distinct. A set S ? V ( G ) is called an identifying code in G , if the sets S ? N [ u ] where u ? V ( G ) are all nonempty and distinct. We study locating and identifying codes in the circulant networks  C n ( 1 , 3 ) . For an integer n ? 7 , the graph C n ( 1 , 3 ) has vertex set Z n and edges x y where x , y ? Z n and | x ? y | ? { 1 , 3 } . We prove that a smallest locating code in C n ( 1 , 3 ) has size ? n / 3 ? + c , where c ? { 0 , 1 } , and a smallest identifying code in C n ( 1 , 3 ) has size ? 4 n / 11 ? + c ? , where c ? ? { 0 , 1 } .

M. Ghebleh; L. Niepel

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "general circulation models" 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

Instability of single-phase natural circulation under multiple loops  

SciTech Connect (OSTI)

Natural circulation loop passively conveys heat from heat sources to heat sinks without mechanical pump. Various plants have natural circulation systems, e.g., solar heaters, Light Water Reactor (LWR) and Liquid Metal Fast Breeder Reactor (LMFBR). The core of LMFBR is cooled by forced convection of single-phase liquid sodium in normal operation. After the accident, the decay heat of the core is designed to be cooled by the natural circulation of the liquid sodium. The natural circulation cooling is very important from a viewpoint of passive safety concept. Here, the natural circulation in single loop system had been studied by many researchers. In a multiple loop system, the instability of natural circulation was more complicated because of the interaction between the loops. In this study, the effects of the multiple loop on the natural circulation instability were investigated numerically. The multiple loops system with one heating tube and two cooling tubes were evaluated. The one-dimensional energy and momentum equations were solved using Finite Difference Method. The flow regimes of the instability were evaluated with varying the heat flux. In multiple loop system, the observed flow was classified into five regimes including chaotic regime. The flow regimes were qualitatively explained by the stability of the attractor in the phase space.

Satoh, A.; Okamoto, K.; Madarame, H. [Univ. of Tokyo, Tokai, Ibaraki (Japan). Nuclear Engineering Research Lab.

1996-08-01T23:59:59.000Z

462

E-Print Network 3.0 - atmospheric circulation related Sample...  

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

is influenced by the oceanic and atmospheric circulations... -surface temperature, ocean currents and atmospheric circulation patterns. In a paper by Delworth et al....

463

On the World-wide Circulation of the Deeper Waters of the World Ocean  

E-Print Network [OSTI]

circulation of the Pacific Ocean: Flow patterns, tracers,in preparing the figures. Fig. 1 Pacific Ocean winds Fig.2 Pacific Ocean circulation Fig. 4 Pacific Ocean potential

Reid, Joseph L

2009-01-01T23:59:59.000Z

464

E-Print Network 3.0 - activating blood circulation Sample Search...  

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

System: The Heart Objectives Summary: . Systemic circulation left side of heart pumps blood through body: - left ventricle pumps oxygenated blood... Circulation 14-26 Blood...

465

A general mechanism for producing scale-invariant perturbations and small non-Gaussianity in ekpyrotic models  

E-Print Network [OSTI]

We explore a new type of entropic mechanism for generating density perturbations in a contracting phase in which there are two scalar fields, but only one has a steep negative potential. This first field dominates the energy density and is the source of the ekpyrotic equation of state. The second field has a negligible potential, but its kinetic energy density is coupled to the first field with a non-linear sigma-model type interaction. We show that for any ekpyrotic equation of state it is possible to choose the potential and the kinetic coupling such that exactly scale-invariant (or nearly scale-invariant) entropy perturbations are produced. The corresponding background solutions are stable, and the bispectrum of the entropy perturbations vanishes as no non-Gaussianity is produced during the ekpyrotic phase. Hence, the only contribution to non-Gaussianity comes from the non-linearity of the conversion process during which entropic perturbations are turned into adiabatic ones, resulting in a local non-Gaussianity parameter $f_{NL} \\sim 5$.

Anna Ijjas; Jean-Luc Lehners; Paul J. Steinhardt

2014-06-06T23:59:59.000Z

466

Japan Sea Thermohaline Structure and Circulation. Part I: Climatology  

Science Journals Connector (OSTI)

In this study, the U.S. Navy’s Generalized Digital Environmental Model (GDEM) climatological temperature and salinity data on a 0.5° × 0.5° grid is used to investigate the seasonal variabilities of the Japan/East Sea (JES) thermohaline structure ...

Peter C. Chu; Jian Lan; Chenwu Fan

2001-01-01T23:59:59.000Z

467

Update of waste fuel firing experience in Foster Wheeler circulating fluidized bed boilers  

SciTech Connect (OSTI)

As the costs and availability of more conventional fuels continue to escalate, more and more customers are investigating and choosing operation with lower cost waste or alternative fuels. Details of units firing waste or alternative fuels which have been in active service for many years are summarized, and the fuel analyses are given. This chapter gives a general overview of the projects that are or will be firing waste or alternative fuels, namely, the Mt. Carmel Manitowoc, NISCO and HUNOSA units. The experience of the four operating units has demonstrated that waste and alternative fuels can be successfully and economically burned in an atmosphere circulating fluidized bed unit while meeting permitted emission requirements.

Abdulally, I.F.; Reed, K.A.

1993-12-31T23:59:59.000Z

468

Global warming and thermohaline circulation stability  

Science Journals Connector (OSTI)

...often be analysed analytically to give conceptual understanding. Intermediate complexity models (often called `Earth System Models of Intermediate Complexity' or `EMICs') include more processes, albeit often in highly parametrized ways...

2003-01-01T23:59:59.000Z

469

Adaptive Wavelet-Based Ocean Circulation Modeling Shanon M. Reckinger  

E-Print Network [OSTI]

Engineering, University of Colorado, 2010 A thesis submitted to the Faculty of the Graduate School of the University of Colorado in partial fulfillment of the requirements for the degree of Doctor of Philosophy, western boundary cur- rents, and tsunamis on adaptive grids using novel boundary techniques is considered

Vasilyev, Oleg V.

470

Modeling upwelling circulation off the Oregon coast Jianping Gan  

E-Print Network [OSTI]

-resolution curvilinear grid is utilized. The response of the coastal ocean to forcing by observed wind stress and heat fields. Over the bank the alongshore coastal jet is displaced offshore, and colder upwelled water extends-rich surface waters near the coast. Along the north central part of the Oregon coast between 45°N and 45.5°N

Gan, Jian-Ping

471

Improving Heating System Operations Using Water Re-Circulation  

E-Print Network [OSTI]

In order to solve the imbalance problem of a heating system, brought about by consumer demand and regulation, and save the electricity energy consumed by a circulation pump, a water mixing and pressure difference control heating system is proposed...

Li, F.; Han, J.

2006-01-01T23:59:59.000Z

472

Isentropic diagnostics of mid-latitude circulation and transport  

E-Print Network [OSTI]

This thesis examines the mid-latitude circulation and tracer transport using zonal average isentropic diagnostics. The Underworld (i.e. the region roughly below the 300K-isentrope) is targeted by our research. Currently, ...

Koh, Tieh-Yong, 1972-

2001-01-01T23:59:59.000Z

473

SURFACE CIRCULATION AND VENTILATION Lynne D. Talley(1)  

E-Print Network [OSTI]

of autonomous subsurface profiling to include oxygen and turbulence profiling, and implementation of local of subsurface circulation in the wind-driven gyres (section 2), and (2) ventilation/upwelling processes

Talley, Lynne D.

474

The Hadley Circulation as a Radiative–Convective Instability  

Science Journals Connector (OSTI)

Hadley cell simulations over a tropical ocean are reported that suggest that the emission and absorption of thermal radiation by clouds plays an important role in the dynamics of the Hadley circulation. In particular, inclusion of interactions ...

David J. Raymond

2000-05-01T23:59:59.000Z

475

Hadley Circulations for Zonally Averaged Heating Centered off the Equator  

Science Journals Connector (OSTI)

Consistent with observations, we find that moving peak heating even 2 degrees off the equator leads to profound asymmetries in the Hadley circulation, with the winter cell amplifying greatly and the summer cell becoming negligible. It is found ...

Richard S. Lindzen; Arthur V. Hou

1988-09-01T23:59:59.000Z

476

The Influence of Concentrated Heating on the Hadley Circulation  

Science Journals Connector (OSTI)

This study extends the earlier work on Hadley circulations forced by broad, global heating distributions to situations where heating is latitudinally concentrated. In the case of heating symmetrically centered on the equator, concentration ...

Arthur Y. Hou; Richard S. Lindzen

1992-07-01T23:59:59.000Z

477

Eddy Influences on Hadley Circulations: Simulations with an Idealized GCM  

Science Journals Connector (OSTI)

An idealized GCM is used to investigate how the strength and meridional extent of the Hadley circulation depend on the planet radius, rotation rate, and thermal driving. Over wide parameter ranges, the strength and meridional extent of the Hadley ...

Christopher C. Walker; Tapio Schneider

2006-12-01T23:59:59.000Z

478

Hadley Circulations on a Nonuniformly Heated Rotating Plate  

Science Journals Connector (OSTI)

Hadley circulations in a shallow fluid layer driven by a radial temperature gradient in the bottom plate have been investigated experimentally. The temperature on top of the fluid was uniform, and the vertical temperature gradient in the fluid ...

E. L. Koschmieder; E. R. Lewis

1986-11-01T23:59:59.000Z

479

Hadley Circulation as a Modulator of the Extratropical Climate  

Science Journals Connector (OSTI)

Studies based on GCM ensemble forecasts have shown that an intensification of the cross-equatorial Hadley circulation associated with a latitudinal displacement of the zonally averaged convective heating in the Tropics can lead to remote warming ...

Arthur Y. Hou

1998-07-01T23:59:59.000Z

480

Patterns of Bubble Clouds organized by Langmuir Circulation  

Science Journals Connector (OSTI)

A commonly observed property of near-surface bubble distributions is their collective organization into long rows aligned with the wind under the influence of Langmuir circulation. Time series observations with sonars having fixed orientation ...

David Farmer; Ming Li

1995-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "general circulation models" 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

Research in lost circulation control for geothermal wells  

SciTech Connect (OSTI)

This paper reviews recent progress at Sandia National Laboratories in the area of lost circulation control for geothermal wells. The Lost Circulation Program has three major elements: (1) Detection and characterization of loss zones, (2) Development of new techniques and materials for control of loss zones, and (3) Integration of the first two items for wellsite application. Most of our work to date has been in the area of developing new techniques and materials. We report here on progress that has been made in the past two years in the development of new, pumpable cementitious muds, in situ mixing and placement of polyurethane foams, and fundamental analysis of and materials development for particulate lost circulation materials. Plans for work in the area of zone detection and characterization, including development of a transient, lost circulation hydraulics simulator and field zone characterization using an advanced wellbore televiewer, are discussed.

Ortega, A.; Loeppke, G.E.; Givler, R.C.

1987-01-01T23:59:59.000Z

482

Property:Building/SPElectrtyUsePercCirculationFans | Open Energy  

Open Energy Info (EERE)

SPElectrtyUsePercCirculationFans SPElectrtyUsePercCirculationFans Jump to: navigation, search This is a property of type String. Circulation fans Pages using the property "Building/SPElectrtyUsePercCirculationFans" Showing 25 pages using this property. (previous 25) (next 25) S Sweden Building 05K0001 + 18.6715328229 + Sweden Building 05K0002 + 0.0 + Sweden Building 05K0003 + 3.84924044288 + Sweden Building 05K0004 + 13.5679722118 + Sweden Building 05K0005 + 10.115947775 + Sweden Building 05K0006 + 10.4348038368 + Sweden Building 05K0007 + 3.09034005771 + Sweden Building 05K0008 + 1.5024342653 + Sweden Building 05K0009 + 13.4365662073 + Sweden Building 05K0010 + 0.0 + Sweden Building 05K0011 + 2.75323793817 + Sweden Building 05K0012 + 15.8993705073 + Sweden Building 05K0013 + 1.11354848212 +

483

A Cost-Effective Trace Gas Measurement Program for Long-Term Monitoring of the Stratospheric Circulation  

Science Journals Connector (OSTI)

A stratospheric trace gas measurement program using balloon-based sonde and AirCore sampler techniques is proposed as a way to monitor the strength of the stratospheric mean meridional or Brewer–Dobson circulation. Modeling work predicts a strengthening ...

Fred L. Moore; Eric A. Ray; Karen H. Rosenlof; James W. Elkins; Pieter Tans; Anna Karion; Colm Sweeney

2014-01-01T23:59:59.000Z

484

Liposomal Vincristine Which Exhibits Increased Drug Retention and Increased Circulation Longevity Cures Mice Bearing P388 Tumors  

Science Journals Connector (OSTI)

...tumor models (9). Four mice were used per time point. The mice were anesthetized...the circulation half-lift of vincristine from approximately...retention. At every time point, .@. 0 0 a a. :3...the mean using at least four mice. higher drug...

Nancy L. Boman; Dana Masin; Lawrence D. Mayer; Pieter R. Cullis; and Marcel B. Bally

1994-06-01T23:59:59.000Z

485

Thermal drawdown analysis of the Hijiori HDR 90-day circulation test  

SciTech Connect (OSTI)

The Hijiori 90-day circulation test is unique in the development of HDR technology in that it was the first (and thus far the only) multiproduction well test run for a sufficient production period to obtain observed cooldown curves at multiple production horizons in the stimulated reservoir volume. The experimental data have been analyzed by the SGP 1-D linear heat sweep model to examine the extent of thermal cooldown in this relatively small, multi-well, multi-zone reservoir. Although changes in production flow were carried out in specific wells at specific times during the 90 days of circulation, matching of the observed cooldown curves in conjunction with the structural and temperature logging data allows estimation of the reservoir volume and the mean fracture spacing between rock blocks for heat extraction during the 90-day test.

Kruger, Paul; Yamaguchi, Tsutomu

1993-01-28T23:59:59.000Z

486

Inspector General  

Broader source: Energy.gov (indexed) [DOE]

Office of the Under Secretary for Nuclear Security Edward B. Held (Acting) Under Secretary for Nuclear Security DEPARTMENT OF ENERGY Office of the Under Secretary for Management & Performance Vacant Under Secretary for Management and Performance Office of the Under Secretary for Science & Energy Vacant Under Secretary for Science and Energy Southwestern Power Administration Bonneville Power Administration Western Area Power Administration Southeastern Power Administration U.S. Energy Information Administration Loan Programs Office Advanced Research Projects Agency - Energy General Counsel Assistant Secretary for Congressional & Intergovernmental Affairs Chief Human Capital Officer

487

Multi-scale modeling of Puget Sound using an unstructured-grid coastal ocean model: from tide flats to estuaries and coastal waters  

SciTech Connect (OSTI)

Water circulation in Puget Sound, a large complex estuary system in the Pacific Northwest coastal ocean of the United States, is governed by multiple spatially and temporally varying forcings from tides, atmosphere (wind, heating/cooling, precipitation/evaporation, pressure), and river inflows. In addition, the hydrodynamic response is affected strongly by geomorphic features, such as fjord-like bathymetry and complex shoreline features, resulting in many distinguishing characteristics in its main and sub-basins. To better understand the details of circulation features in Puget Sound and to assist with proposed nearshore restoration actions for improving water quality and the ecological health of Puget Sound, a high-resolution (around 50 m in estuaries and tide flats) hydrodynamic model for the entire Puget Sound was needed. Here, a threedimensional circulation model of Puget Sound using an unstructured-grid finite volume coastal ocean model is presented. The model was constructed with sufficient resolution in the nearshore region to address the complex coastline, multi-tidal channels, and tide flats. Model open boundaries were extended to the entrance of the Strait of Juan de Fuca and the northern end of the Strait of Georgia to account for the influences of ocean water intrusion from the Strait of Juan de Fuca and the Fraser River plume from the Strait of Georgia, respectively. Comparisons of model results, observed data, and associated error statistics for tidal elevation, velocity, temperature, and salinity indicate that the model is capable of simulating the general circulation patterns on the scale of a large estuarine system as well as detailed hydrodynamics in the nearshore tide flats. Tidal characteristics, temperature/salinity stratification, mean circulation, and river plumes in estuaries with tide flats are discussed.

Yang, Zhaoqing; Khangaonkar, Tarang

2010-11-19T23:59:59.000Z

488

Atmospheric model intercomparison project: Monsoon simulations  

SciTech Connect (OSTI)

The simulation of monsoons, in particular the Indian summer monsoon, has proven to be a critical test of a general circulation model`s ability to simulate tropical climate and variability. The Monsoon Numerical Experimentation Group has begun to address questions regarding the predictability of monsoon extremes, in particular conditions associated with El Nino and La Nina conditions that tend to be associated with drought and flood conditions over the Indian subcontinent, through a series of seasonal integrations using analyzed initial conditions from successive days in 1987 and 1988. In this paper the authors present an analysis of simulations associated with the Atmospheric Model Intercomparison Project (AMIP), a coordinated effort to simulate the 1979--1988 decade using standardized boundary conditions with approximately 30 atmospheric general circulation models. The 13 models analyzed to date are listed. Using monthly mean data from these simulations they have calculated indices of precipitation and wind shear in an effort to access the performance of the models over the course of the AMIP decade.

Sperber, K.R. [Lawrence Livermore National Lab., CA (United States). Program for Climate Model Diagnosis and Intercomparison; Palmer, T.N. [European Centre for Medium-Range Weather Forecasts, Reading (United Kingdom)

1994-06-01T23:59:59.000Z

489

Mechanism of Interaction Between the General Anesthetic Halothane and a Model Ion Channel Protein, I: Structural Investigations via X-Ray Reflectivity from Langmuir Monolayers  

SciTech Connect (OSTI)

We previously reported the synthesis and structural characterization of a model membrane protein comprised of an amphiphilic 4-helix bundle peptide with a hydrophobic domain based on a synthetic ion channel and a hydrophilic domain with designed cavities for binding the general anesthetic halothane. In this work, we synthesized an improved version of this halothane-binding amphiphilic peptide with only a single cavity and an otherwise identical control peptide with no such cavity, and applied x-ray reflectivity to monolayers of these peptides to probe the distribution of halothane along the length of the core of the 4-helix bundle as a function of the concentration of halothane. At the moderate concentrations achieved in this study, approximately three molecules of halothane were found to be localized within a broad symmetric unimodal distribution centered about the designed cavity. At the lowest concentration achieved, of approximately one molecule per bundle, the halothane distribution became narrower and more peaked due to a component of {approx}19Angstroms width centered about the designed cavity. At higher concentrations, approximately six to seven molecules were found to be uniformly distributed along the length of the bundle, corresponding to approximately one molecule per heptad. Monolayers of the control peptide showed only the latter behavior, namely a uniform distribution along the length of the bundle irrespective of the halothane concentration over this range. The results provide insight into the nature of such weak binding when the dissociation constant is in the mM regime, relevant for clinical applications of anesthesia. They also demonstrate the suitability of both the model system and the experimental technique for additional work on the mechanism of general anesthesia, some of it presented in the companion parts II and III under this title.

Strzalka, J.; Liu, J; Tronin, A; Churbanova, I; Johansson, J; Blasie, J

2009-01-01T23:59:59.000Z

490

Studies of the General Circulation of the Atmosphere with a Simplified Moist  

E-Print Network [OSTI]

is whether these can build up and rapidly release convectively available potential energy. The formulation of moisture on midlatitude static stability, eddy scales, and energy transports (this section to be remarkably neutral with respect to moist convection. Despite the large changes in dry stability

Frierson, Dargan

491

WORK IN PROGRESS --NOT FOR GENERAL CIRCULATION Animal Spirits: Affective and Deliberative  

E-Print Network [OSTI]

as the limbic system. This is the powerhouse of the brain -- generator of the appetites, urges, emotions

492

General Category  

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

Sunrise and Sunset Visual Differences Sunrise and Sunset Visual Differences Name: Joey Status: other Grade: other Country: Canada Date: Spring 2012 Question: It seems that sunrise and sunset don't look symmetric. I mean that sunsets tend to have much redder skies and sunrise is usually a bit gloomier. If you see a picture, many times you can tell if its sunrise or sunset, even though I would think they should like identical, except that the sun is either going up or going down. Why do they not appear the same but in reverse? Replies: Funny you should ask as a paper just arrived which is sure to have the answer and I will read it now....... OK, the morning sky, and the sky in general, is blue due to Rayleigh scattering [which affects short wavelengths the most] of the sun light by air molecules and other microscopic particles.

493

GENERALIZED CALIBRATION  

E-Print Network [OSTI]

work is done using NIR-spectra for gasoline and wheat. Keywords Calibration, NIR spectroscopy, linear;5 Contents 1 Introduction 9 2 Gasoline example 11 2.1 Data . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.1.1 Model selection by cross-validation . . . . . . . . . . 26 4.2 MLLS applied to gasoline

494

DECADAL CHANGES IN THE HADLEY CIRCULATION * Department of Atmospheric Sciences, Peking University  

E-Print Network [OSTI]

1 DECADAL CHANGES IN THE HADLEY CIRCULATION * YONGYUN HU CHEN ZHOU Department of Atmospheric Sciences, Peking University Beijing, 100871, China The Hadley circulation is one of the most important atmospheric circulations. The main goal of this paper is to investigate whether the Hadley circulation has

Hu, Yongyun

495

Supercritical Hadley circulation within a layer of fluid saturated porous medium: Bifurcation to traveling wave  

SciTech Connect (OSTI)

Hadley circulation induced by horizontal and vertical temperature gradients imposed on a fluid saturated porous medium layer is simulated numerically. The flow is assumed to be longitudinal, that is the secondary flow is composed of cells with axes transverse to the direction of the Hadley circulation. Critical (bifurcation) states predicted theoretically via linear stability analysis are verified by the numerical results giving confidence on the accuracy of the method. Several values of horizontal Rayleigh number, Ra{sub h}, and vertical Rayleigh number, Ra{sub v}, are studied. Results indicate that beyond a threshold horizontal Rayleigh number value the flow and temperature fields evolve from subcritical Hadley circulation to a supercritical time periodic flow. The secondary flow emerges in the form of a traveling wave aligned with the main (Hadley) flow direction. This traveling wave is characterized, at supercritical low vertical Rayleigh numbers, by the continuous drifting of two horizontal layers of flow cells that move in opposite directions. As the vertical Rayleigh number increases, the traveling wave becomes characterized by a unique layer of cells drifting in the direction opposite to the applied horizontal temperature gradient. Numerical animation unravels the main features of the transport process. This simplified model is of fundamental and practical importance, for instance, to the study of geothermal activities, underground transport of pollutants, paper processing, crystal growth, building insulation, and gas reservoirs.

Manole, D.M. [MCD Inc., Anniston, AL (United States); Lage, J.L.; Antohe, B.V. [Southern Methodist Univ., Dallas, TX (United States)

1995-12-31T23:59:59.000Z

496

What Drives the Brewer–Dobson Circulation?  

Science Journals Connector (OSTI)

Recent studies have revealed strong interactions between resolved Rossby wave and parameterized gravity wave driving in stratosphere-resolving atmospheric models. Perturbations to the parameterized wave driving are often compensated by opposite ...

Naftali Y. Cohen; Edwin P. Gerber; Oliver Bühler

2014-10-01T23:59:59.000Z

497

PRESSURE DROP EVALUATION OF THE HYDROGEN CIRCULATION SYSTEM FOR JSNS  

SciTech Connect (OSTI)

In J-PARC, an intense spallation neutron source (JSNS) driven by a proton beam of 1 MW has selected supercritical hydrogen with a temperature of around 20 K and the pressure of 1.5 MPa as a moderator material. A hydrogen-circulation system, which consists of two pumps, an ortho-para hydrogen converter, a heater, an accumulator and a helium-hydrogen heat exchanger, has been designed to provide supercritical hydrogen to the moderators and remove the nuclear heating there. A hydrogen-circulation system is cooled through the heat exchanger by a helium refrigerator with the refrigeration power of 6.45 kW at 15.5 K. It is important for the cooling design of the hydrogen-circulation system to understand the pressure drops through the equipments. In this work, the pressure drop through each component was analyzed by using a CFD code, STAR-CD. The correlation of the pressure drops through the components that can describe the analytical results within 14% differences has been derived. It is confirmed that the pressure drop in the hydrogen circulation system would be estimated to be 37 kPa for the circulation flow rate of 160 g/s by using the correlations derived here, and is sufficiently lower than the allowable pump head of 100 kPa.

Tatsumoto, H.; Aso, T.; Ohtsu, K.; Kato, T.; Futakawa, M. [J-PARC Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195 (Japan)

2010-04-09T23:59:59.000Z

498

Sino-Danish brain circulation: scholarship, capacity and policy  

Science Journals Connector (OSTI)

China is faced with urgent needs to develop an economically and environmentally sustainable economy based on innovation and knowledge. Brain circulation and research and business investments from the outside are central for this development. Sino-American brain circulation and research and investment by overseas researchers and entrepreneurs are well described. In that case, the US is the centre of global R&D and S&T. However, the brain circulation and research and investments between a small open Scandinavian economy, such as Denmark, and the huge developing economy of China are not well understood. In this case, Denmark is very highly developed, but a satellite in the global R&D and S&T system. With time and the growth of China as a R&D and S&T power house, both Denmark and China will benefit from brain circulation between them. Such brain circulation is likely to play a key role in flows of knowledge, technology and investments between Denmark and China. This paper describes these activities and analyses their contributions to innovation, learning and sustainable growth in both Denmark and China.

Rasmus Gjedssø Bertelsen; Xiangyun Du; Morten Karnøe Søndergaard

2014-01-01T23:59:59.000Z

499

The influence of concentrated heating on the Hadley circulation  

SciTech Connect (OSTI)

This study extends the earlier work on Hadley circulations forced by broad, global heating distributions to situations where heating is latitudinally concentrated. In the case of heating symmetrically centered on the equator, concentration unambiguously increases the intensity of the Hadley circulation-by up to a factor of 5. For heating centered off the equator, its effect depends on whether the concentration is drawn symmetrically from both sides of the heating maximum or whether the heat is preferentially drawn from the winter side. In the latter case, concentration again leads to pronounced intensification of the Hadley circulation. Indeed, agreement between the calculated and observed Hadley intensity is achieved with mild concentration, consistent with the observed zonally averaged precipitation, rather than the narrower rainfall association with the ITCZ. This suggests that a weakening of those processes that broaden the zonally averaged rainfall (i.e., the easterly waves and regional land processes) would result in a much stronger Hadley circulation. The implication of this work is that a small change in the tropical heating distribution can profoundly alter the intensity of the Hadley circulation and the baroclinicity in the extratropics. This can, in turn, modulate wave transport in the middle and high latitudes, resulting in significant changes in the global climate. 82 refs., 24 figs.

Hou, A.Y. (NASA Goddard Space Flight Center, Greenbelt, MD (United States)); Lindzen, R.S. (Massachusetts Institute of Technology, Cambridge, MA (United States))

1992-07-15T23:59:59.000Z

500

Coriolis emf as the real generator of solar magnetic field and a new model of the reversal of the general solar magnetic field  

Science Journals Connector (OSTI)

Generation of general solar magnetic field as proposed by Cowling (1945, 1953) and Drobyshevski (1977) from the Coriolis emf is reconsidered and a new mechanism of the reversal of teh general solar magnetic fi...

L. Manihar Singh; L. Randhoni Devi