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1

Integrated Global System Modeling Framework | Open Energy Information  

Open Energy Info (EERE)

Integrated Global System Modeling Framework Integrated Global System Modeling Framework 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: Integrated Global System Modeling Framework Agency/Company /Organization: MIT Joint Program on the Science and Policy of Global Change Sector: Climate, Energy Focus Area: Renewable Energy Phase: Determine Baseline, Evaluate Options Topics: - Macroeconomic Resource Type: Software/modeling tools User Interface: Desktop Application Complexity/Ease of Use: Not Available Website: globalchange.mit.edu/research/IGSM Cost: Free Related Tools Transport Co-benefits Calculator General Equilibrium Modeling Package (GEMPACK)

2

MIT Integrated Global System Model (IGSM) Version 2: Model Description and Baseline Evaluation  

E-Print Network [OSTI]

The MIT Integrated Global System Model (IGSM) is designed for analyzing the global environmental changes that may result from anthropogenic causes, quantifying the uncertainties associated with the projected changes, and ...

Sokolov, Andrei P.

3

Further Program Development for the Cost Minimizing Global Energy System Model GET-RC.  

E-Print Network [OSTI]

??The linear programming Global Energy Transition (GET) model covers the global energy system and is designed to meet exogenously given energy demand levels, subject to… (more)

Andersson, Magnus

2013-01-01T23:59:59.000Z

4

Climate-Weather Modeling Studies Using a Prototype Global Cloud-System  

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

Climate-Weather Modeling Studies Using a Prototype Global Cloud-System Resolving Model Climate-Weather Modeling Studies Using a Prototype Global Cloud-System Resolving Model Climate-Weather Modeling Studies Using a Prototype Global Cloud-System Resolving Model PI Name: Venkatramani Balaji PI Email: balaji@princeton.edu Institution: Geophysical Fluid Dynamics Laboratory Allocation Program: ESP Allocation Hours at ALCF: 150 Million Year: 2010 to 2013 Research Domain: Earth Science We expect our understanding of the role of clouds in climate to undergo a qualitative change as the resolutions of global models begin to encompass clouds. At these resolutions, non-hydrostatic dynamics become significant and deep convective processes are resolved. We are poised at the threshold of being able to run global scale simulations that include direct, non-parameterized, simulations of deep convective clouds. The goal of this

5

Model Development Development of a system emulating the global carbon cycle in Earth system models  

E-Print Network [OSTI]

developed a loosely coupled model (LCM) which can represent the outputs of a GCMbased Earth system model

K. Tachiiri; J. C. Hargreaves; J. D. Annan; A. Oka; A. Abe-ouchi; M. Kawamiya

2010-01-01T23:59:59.000Z

6

Modeling the global freight transportation system: a multi-level modeling perspective  

Science Journals Connector (OSTI)

The interconnectedness of different actors in the global freight transportation industry has rendered such a system as a large complex system where different sub-systems are interrelated. On such a system, policy-related- exploratory analyses which have ...

Ronald Apriliyanto Halim; Lorant A. Tavasszy; Mamadou D. Seck

2012-12-01T23:59:59.000Z

7

Global search tool for the Advanced Photon Source Integrated Relational Model of Installed Systems (IRMIS) database.  

SciTech Connect (OSTI)

The Integrated Relational Model of Installed Systems (IRMIS) is a relational database tool that has been implemented at the Advanced Photon Source to maintain an updated account of approximately 600 control system software applications, 400,000 process variables, and 30,000 control system hardware components. To effectively display this large amount of control system information to operators and engineers, IRMIS was initially built with nine Web-based viewers: Applications Organizing Index, IOC, PLC, Component Type, Installed Components, Network, Controls Spares, Process Variables, and Cables. However, since each viewer is designed to provide details from only one major category of the control system, the necessity for a one-stop global search tool for the entire database became apparent. The user requirements for extremely fast database search time and ease of navigation through search results led to the choice of Asynchronous JavaScript and XML (AJAX) technology in the implementation of the IRMIS global search tool. Unique features of the global search tool include a two-tier level of displayed search results, and a database data integrity validation and reporting mechanism.

Quock, D. E. R.; Cianciarulo, M. B.; APS Engineering Support Division; Purdue Univ.

2007-01-01T23:59:59.000Z

8

GFDL’s ESM2 Global Coupled Climate–Carbon Earth System Models. Part II: Carbon System Formulation and Baseline Simulation Characteristics  

Science Journals Connector (OSTI)

The authors describe carbon system formulation and simulation characteristics of two new global coupled carbon–climate Earth System Models (ESM), ESM2M and ESM2G. These models demonstrate good climate fidelity as described in part I of this study ...

John P. Dunne; Jasmin G. John; Elena Shevliakova; Ronald J. Stouffer; John P. Krasting; Sergey L. Malyshev; P. C. D. Milly; Lori T. Sentman; Alistair J. Adcroft; William Cooke; Krista A. Dunne; Stephen M. Griffies; Robert W. Hallberg; Matthew J. Harrison; Hiram Levy; Andrew T. Wittenberg; Peter J. Phillips; Niki Zadeh

2013-04-01T23:59:59.000Z

9

Modeling the Global Water Resource System in an Integrated Assessment Modeling Framework: IGSM-WRS  

E-Print Network [OSTI]

The availability of water resources affects energy, agricultural and environmental systems, which are linked together as well as to climate via the water cycle. As such, watersheds and river basins are directly impacted ...

Strzepek, Kenneth M.

10

GFDL’s ESM2 Global Coupled Climate–Carbon Earth System Models. Part I: Physical Formulation and Baseline Simulation Characteristics  

Science Journals Connector (OSTI)

The physical climate formulation and simulation characteristics of two new global coupled carbon–climate Earth System Models, ESM2M and ESM2G, are described. These models demonstrate similar climate fidelity as the Geophysical Fluid Dynamics ...

John P. Dunne; Jasmin G. John; Alistair J. Adcroft; Stephen M. Griffies; Robert W. Hallberg; Elena Shevliakova; Ronald J. Stouffer; William Cooke; Krista A. Dunne; Matthew J. Harrison; John P. Krasting; Sergey L. Malyshev; P. C. D. Milly; Peter J. Phillipps; Lori T. Sentman; Bonita L. Samuels; Michael J. Spelman; Michael Winton; Andrew T. Wittenberg; Niki Zadeh

2012-10-01T23:59:59.000Z

11

Deep Convective Transition Characteristics in the Community Climate System Model and Changes under Global Warming  

Science Journals Connector (OSTI)

Tropical deep convective transition characteristics, including precipitation pickup, occurrence probability, and distribution tails related to extreme events, are analyzed using uncoupled and coupled versions of the Community Climate System Model (...

Sandeep Sahany; J. David Neelin; Katrina Hales; Richard B. Neale

2014-12-01T23:59:59.000Z

12

A methodology for global-sensitivity analysis of time-dependent outputs in systems biology modelling  

Science Journals Connector (OSTI)

...on a desktop computer. This is compared...features of the system. The important...resistance. The analysis also identified...and uncertainty analysis: applications to large-scale systems, vol. 2. Boca...for sensitivity analysis of large models...European Symp. on Computer Aided Process...

2012-01-01T23:59:59.000Z

13

Emission-Induced Nonlinearities in the Global Aerosol System: Results from the ECHAM5-HAM Aerosol-Climate Model  

Science Journals Connector (OSTI)

In a series of simulations with the global ECHAM5-HAM aerosol-climate model, the response to changes in anthropogenic emissions is analyzed. Traditionally, additivity is assumed in the assessment of the aerosol climate impact, as the underlying ...

Philip Stier; Johann Feichter; Silvia Kloster; Elisabetta Vignati; Julian Wilson

2006-08-01T23:59:59.000Z

14

The China-in-Global Energy Model  

E-Print Network [OSTI]

The China-in-Global Energy Model (C-GEM) is a global Computable General Equilibrium (CGE) model that captures the interaction of production, consumption and trade among multiple global regions and sectors – including five ...

Qi, T.

15

Computer modeling of the global warming effect  

SciTech Connect (OSTI)

The state of knowledge of global warming will be presented and two aspects examined: observational evidence and a review of the state of computer modeling of climate change due to anthropogenic increases in greenhouse gases. Observational evidence, indeed, shows global warming, but it is difficult to prove that the changes are unequivocally due to the greenhouse-gas effect. Although observational measurements of global warming are subject to ``correction,`` researchers are showing consistent patterns in their interpretation of the data. Since the 1960s, climate scientists have been making their computer models of the climate system more realistic. Models started as atmospheric models and, through the addition of oceans, surface hydrology, and sea-ice components, they then became climate-system models. Because of computer limitations and the limited understanding of the degree of interaction of the various components, present models require substantial simplification. Nevertheless, in their present state of development climate models can reproduce most of the observed large-scale features of the real system, such as wind, temperature, precipitation, ocean current, and sea-ice distribution. The use of supercomputers to advance the spatial resolution and realism of earth-system models will also be discussed.

Washington, W.M. [National Center for Atmospheric Research, Boulder, CO (United States)

1993-12-31T23:59:59.000Z

16

Global Scratch File System at NERSC  

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

Scratch Scratch Global Scratch File System Overview The global scratch file system (or "global scratch") can be accessed by multiple NERSC systems. Its default quota is much larger than the Global Home quota, so it can be used to temporarily store large amounts of data. This file system is periodically purged. Platforms Using Global Scratch The global scratch file system is available on all NERSC systems except PDSF. Quotas Default global scratch quotas are 20 TB and 2,000,000 inodes. If you need more than that, fill out the Disk Quota Change Request Form. Purging Yes, files in global scratch file system are subject to purging. Backup No, Files in global scratch file system are not backed up. Environment Variable You can reference your personal scratch directory in global scratch as

17

Modelling the global coastal ocean  

Science Journals Connector (OSTI)

...by the present generation of Earth system models, both in terms of resolution...Friedlingstein et al. 2001). These Earth system models invariably give a very poor...the current generation of Earth system models is a long way from resolving...

2009-01-01T23:59:59.000Z

18

A Global Land System Framework for Integrated Climate-Change Assessments  

E-Print Network [OSTI]

Land ecosystems play a major role in the global cycles of energy, water, carbon and nutrients. A Global Land System (GLS) framework has been developed for the Integrated Global Systems Model Version 2 (IGSM2) to simulate ...

Schlosser, C. Adam

19

Global nuclear material flow/control model  

SciTech Connect (OSTI)

This is the final report of a two-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). The nuclear danger can be reduced by a system for global management, protection, control, and accounting as part of an international regime for nuclear materials. The development of an international fissile material management and control regime requires conceptual research supported by an analytical and modeling tool which treats the nuclear fuel cycle as a complete system. The prototype model developed visually represents the fundamental data, information, and capabilities related to the nuclear fuel cycle in a framework supportive of national or an international perspective. This includes an assessment of the global distribution of military and civilian fissile material inventories, a representation of the proliferation pertinent physical processes, facility specific geographic identification, and the capability to estimate resource requirements for the management and control of nuclear material. The model establishes the foundation for evaluating the global production, disposition, and safeguards and security requirements for fissile nuclear material and supports the development of other pertinent algorithmic capabilities necessary to undertake further global nuclear material related studies.

Dreicer, J.S.; Rutherford, D.S.; Fasel, P.K.; Riese, J.M.

1997-10-01T23:59:59.000Z

20

Global Positioning System receiver evaluation results  

SciTech Connect (OSTI)

A Sandia project currently uses an outdated Magnavox 6400 Global Positioning System (GPS) receiver as the core of its navigation system. The goal of this study was to analyze the performance of the current GPS receiver compared to newer, less expensive models and to make recommendations on how to improve the performance of the overall navigation system. This paper discusses the test methodology used to experimentally analyze the performance of different GPS receivers, the test results, and recommendations on how an upgrade should proceed. Appendices contain detailed information regarding the raw data, test hardware, and test software.

Byrne, R.H.

1993-09-01T23:59:59.000Z

Note: This page contains sample records for the topic "global system modeling" 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

Cooperative global security programs modeling & simulation.  

SciTech Connect (OSTI)

The national laboratories global security programs implement sustainable technical solutions for cooperative nonproliferation, arms control, and physical security systems worldwide. To help in the development and execution of these programs, a wide range of analytical tools are used to model, for example, synthetic tactical environments for assessing infrastructure protection initiatives and tactics, systematic approaches for prioritizing nuclear and biological threat reduction opportunities worldwide, and nuclear fuel cycle enrichment and spent fuel management for nuclear power countries. This presentation will describe how these models are used in analyses to support the Obama Administration's agenda and bilateral/multinational treaties, and ultimately, to reduce weapons of mass destruction and terrorism threats through international technical cooperation.

Briand, Daniel

2010-05-01T23:59:59.000Z

22

Evaluating the Land and Ocean Components of the Global Carbon Cycle in the CMIP5 Earth System Models  

Science Journals Connector (OSTI)

The authors assess the ability of 18 Earth system models to simulate the land and ocean carbon cycle for the present climate. These models will be used in the next Intergovernmental Panel on Climate Change (IPCC) Fifth Assessment Report (AR5) for ...

A. Anav; P. Friedlingstein; M. Kidston; L. Bopp; P. Ciais; P. Cox; C. Jones; M. Jung; R. Myneni; Z. Zhu

2013-09-01T23:59:59.000Z

23

Global Wind Systems Inc | Open Energy Information  

Open Energy Info (EERE)

Wind Systems Inc Wind Systems Inc Jump to: navigation, search Name Global Wind Systems, Inc. Place Novi, Michigan Zip 48375 Product Michigan-based startup company that plans to develop a turbine assembly plant in the town of Novi, using a manufacturing model licensed from Hamburg, Germany. Coordinates 42.46626°, -83.486284° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":42.46626,"lon":-83.486284,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

24

A Global Cloud Resolving Model Goals  

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

Cloud Resolving Model Cloud Resolving Model Goals Uniform global horizontal grid spacing of 4 km or better ("cloud permitting") 100 or more layers up to at least the stratopause Parameterizations of microphysics, turbulence (including small clouds), and radiation Execution speed of at least several simulated days per wall-clock day on immediately available systems Annual cycle simulation by end of 2011. Motivations Parameterizations are still problematic. There are no spectral gaps. The equations themselves change at high resolution. GCRMs will be used for NWP within 10 years. GCRMs will be used for climate time-slices shortly thereafter. It's going to take some time to learn how to do GCRMs well. Scaling Science Length, Spatial extent, #Atoms, Weak scaling Time scale

25

Indian Ocean Warming During 1950–2005 Determined by Flexible Global Ocean–Atmosphere–Land System Model (FGOALS)  

Science Journals Connector (OSTI)

The Indian Ocean has exhibited a basin-wide warming ... effectively reproduced by version 2 of the grid-point and spectral versions of the Flexible Global ... K), respectively. The trend of the Indian Ocean avera...

Lu Dong; Tianjun Zhou

2014-01-01T23:59:59.000Z

26

Toward a global observation and modeling system for studying the ecology of the open ocean using acoustics.  

Science Journals Connector (OSTI)

The CLIOTOP (mid?trophic automatic acoustic sampling) project and the EurOcean consortium are organizing a workshop in May 2011 in Bergen Norway. The presentation will summarize the discussions and conclusions from the workshop. The workshop will deal with the technological and modeling issues related to the mass deployment of acoustic sensors in the open ocean environment. The technological challenges that will be addressed are plans and concepts for novel platforms carrying acoustics and complementary techniques energy supply and consumption and data transfer technology. Presently acoustics cannot provide measures of the species?specific biomass of all taxa and complementary technologies and ecosystemmodels need to be tailored to the available data. The modeling part of the workshop will focus mainly on the model?data links. It will cover the topics required to design a large scale observational system and to improve the combination of models and observations through data assimilation. The use of acoustic data in marine ecosystemmodels is indeed often done in a fairly naive way typically by assuming that acoustic measurements can provide acute and precise estimates of biomass. This leads to underestimated uncertainty and potentially biased results which need to be rigorously addressed in appropriate state?space frameworks.

Nils Olav Handegard; Geir Huse; Olivier Maury; Nils Christian Stenseth

2011-01-01T23:59:59.000Z

27

Global Home File System at NERSC  

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

Home Home Global Home Filesystem Overview Global home directories (or "global homes") provide a convenient means for a user to have access to source files, input files, configuration files, etc., regardless of the platform the user is logged in to. Wherever possible, you should refer to your home directory using the environment variable $HOME. The absolute path to your home directory (e.g., /u4/elvis/) may change, but the value of $HOME will always be correct. For security reasons, you should never allow "world write" access to your $HOME directory or your $HOME/.ssh directory. NERSC scans for such security weakness, and, if detected, will change the permissions on your directories. Platforms Utilizing Global Home The Global Home file system is available on all NERSC systems except PDSF.

28

Global optimization of hybrid systems  

E-Print Network [OSTI]

Systems that exhibit both discrete state and continuous state dynamics are called hybrid systems. In most nontrivial cases, these two aspects of system behavior interact to such a significant extent that they cannot be ...

Lee, Cha Kun

2006-01-01T23:59:59.000Z

29

Global Trade and Environmental Model (GTEM) | Open Energy Information  

Open Energy Info (EERE)

Global Trade and Environmental Model (GTEM) Global Trade and Environmental Model (GTEM) 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: Global Trade and Environmental Model (GTEM) Agency/Company /Organization: Australia Department of Agriculture, Fisheries, and Forestry (ABARES) Sector: Climate, Energy Topics: Analysis Tools Complexity/Ease of Use: Moderate Website: www.daff.gov.au/abares/publications_remote_content/publication_topics/ Related Tools Environmental Benefits Mapping and Analysis Program (BenMAP) Intertemporal Computable Equilibrium System (ICES) Ventana's Energy, Environment, Economy-Society (E3S) Model ... further results Captures the impact of policy changes on large numbers of economic

30

Self-correcting differential global positioning system  

E-Print Network [OSTI]

The Global Positioning System (GPS) is a satellite based system that can accurately determine a user's position in terms of latitude, longitude, and height or in terms of X, Y, and Z. The X, Y, and Z coordinate system is an Earth Centered Earth...

Schreiber, Randal Alfred

2012-06-07T23:59:59.000Z

31

GLOBAL COMPREHENSIVE MODELS IN POLITICS AND POLICYMAKING  

E-Print Network [OSTI]

. In this editorial, I reflect on the role of comprehensive models, such as IAMs and earth system models (ESMs

Edwards, Paul N.

32

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

33

Consistent global responses of marine ecosystems to future climate change across the IPCC AR5 earth system models  

Science Journals Connector (OSTI)

We analyze for the first time all 16 Coupled Model Intercomparison Project Phase 5 models with explicit marine ecological modules to identify the common mechanisms involved in projected phytoplankton biomass, ...

Anna Cabré; Irina Marinov; Shirley Leung

2014-10-01T23:59:59.000Z

34

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

35

Global climate models: Past, present, and future  

Science Journals Connector (OSTI)

...atmosphere-ocean models, but common forcing scenarios (compiled by Cubasch and Fischer-Bruns,).¶ Recently, Earth system models are an attempt to integrate even more components of the climate system, such as the biosphere and cryosphere (9...

Martin Stute; Amy Clement; Gerrit Lohmann

2001-01-01T23:59:59.000Z

36

Descriptive Analysis of the Global Climate System and Predictive Modeling for Uncertainty Reduction in Climate Projections using Complex Networks  

E-Print Network [OSTI]

in Climate Projections using Complex Networks Karsten Steinhaeuser (ksteinha@nd.edu) Department of Computer focuses mainly on the second of these objectives, namely, projections of changes in regional climate and their impacts on natural and man-made systems. Traditionally, projections of future climate are based primarily

Chawla, Nitesh V.

37

UC Irvine's Earth System Science Department has opportunities for postdocs and grad. students interested in global-scale cryospheric modeling. Our projects  

E-Print Network [OSTI]

interested in global-scale cryospheric modeling. Our projects (http://www.ess.uci.edu/~zender#ans and http://www.ess among the groups of Professors Charlie Zender (Aerosols, Radiation, http://www.ess.uci.edu/~zender), Jay Famiglietti (Hydrology, http://www.ess.uci.edu/~famiglietti), and Jim Randerson (Fire, C, H2O, http://www.ess

Zender, Charles

38

UNCERTAINTY IN THE GLOBAL FORECAST SYSTEM  

SciTech Connect (OSTI)

We validated one year of Global Forecast System (GFS) predictions of surface meteorological variables (wind speed, air temperature, dewpoint temperature, air pressure) over the entire planet for forecasts extending from zero hours into the future (an analysis) to 36 hours. Approximately 12,000 surface stations world-wide were included in this analysis. Root-Mean-Square- Errors (RMSE) increased as the forecast period increased from zero to 36 hours, but the initial RMSE were almost as large as the 36 hour forecast RMSE for all variables. Typical RMSE were 3 C for air temperature, 2-3mb for sea-level pressure, 3.5 C for dewpoint temperature and 2.5 m/s for wind speed. Approximately 20-40% of the GFS errors can be attributed to a lack of resolution of local features. We attribute the large initial RMSE for the zero hour forecasts to the inability of the GFS to resolve local terrain features that often dominate local weather conditions, e.g., mountain- valley circulations and sea and land breezes. Since the horizontal resolution of the GFS (about 1{sup o} of latitude and longitude) prevents it from simulating these locally-driven circulations, its performance will not improve until model resolution increases by a factor of 10 or more (from about 100 km to less than 10 km). Since this will not happen in the near future, an alternative for the near term to improve surface weather analyses and predictions for specific points in space and time would be implementation of a high-resolution, limited-area mesoscale atmospheric prediction model in regions of interest.

Werth, D.; Garrett, A.

2009-04-15T23:59:59.000Z

39

Advanced chemistry-transport modeling and observing systems allow daily air quality observations, short-term forecasts, and real-time analyses of air quality at the global and  

E-Print Network [OSTI]

Advanced chemistry-transport modeling and observing systems allow daily air quality observations, short-term forecasts, and real-time analyses of air quality at the global and European scales control measures that could be taken for managing such episodes, European-scale air quality forecasting

Paris-Sud XI, Université de

40

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

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


41

Astronomical relativistic reference systems with multipolar expansion: the global one  

E-Print Network [OSTI]

With rapid development of techniques for astronomical observations, the precision of measurements has been significantly increasing. Theories of astronomical relativistic reference systems, which are the foundation for processing and interpreting these data now and in the future, may require extensions to satisfy the needs of these trends. Besides building a framework compatible with alternative theories of gravity and the pursuit of higher order post-Newtonian approximation, it will also be necessary to make the first order post-Newtonian multipole moments of celestial bodies be explicitly expressed in the astronomical relativistic reference systems. This will bring some convenience into modeling the observations and experiments and make it easier to distinguish different contributions in measurements. As the first step, the global solar system reference system is multipolarly expanded and the post-Newtonian mass and spin moments are shown explicitly in the metric which describes the coordinates of the system. The full expression of the global metric is given.

Yi Xie

2014-07-07T23:59:59.000Z

42

Global manufacturing model and case studies  

E-Print Network [OSTI]

chain network. 3. 7 Level of firm's global manufacturing competitiveness. . . . 3. 8 A typical unit-cost curve. . 3. 9 Ford Fiesta production network in Western Europe. . . . . . . 35 38 39 42 3. 10 Integrated information system, 51 3. 11 World..., Japan, and Europe. 4. 1 Hofstede's scores of USA and Mexico. 91 4. 2 Average daily wage plus benefits and taxes by occupation. . . . 94 CHAPTER I INTRODUCTION Black & Decker, a $5 billion U. S. -based manufacturer of hand tools, provides an example...

Kijtawesataporn, Komsun

2012-06-07T23:59:59.000Z

43

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

E-Print Network [OSTI]

CERFACS: Scientific Report ``Climate Modelling & Global Change'' Project 1992 ­ 1993 October 25 th. The ``Climate Modelling & Global Change'' project has played a key role in this achievement, after two years­of­the art climate model. Based on these actual and potential achievements, the Global Change CERFACS project

44

Global Biogeochemistry Models and Global Carbon Cycle Research at Lawrence Livermore National Laboratory  

SciTech Connect (OSTI)

The climate modeling community has long envisioned an evolution from physical climate models to ''earth system'' models that include the effects of biology and chemistry, particularly those processes related to the global carbon cycle. The widely reproduced Box 3, Figure 1 from the 2001 IPCC Scientific Assessment schematically describes that evolution. The community generally accepts the premise that understanding and predicting global and regional climate change requires the inclusion of carbon cycle processes in models to fully simulate the feedbacks between the climate system and the carbon cycle. Moreover, models will ultimately be employed to predict atmospheric concentrations of CO{sub 2} and other greenhouse gases as a function of anthropogenic and natural processes, such as industrial emissions, terrestrial carbon fixation, sequestration, land use patterns, etc. Nevertheless, the development of coupled climate-carbon models with demonstrable quantitative skill will require a significant amount of effort and time to understand and validate their behavior at both the process level and as integrated systems. It is important to consider objectively whether the currently proposed strategies to develop and validate earth system models are optimal, or even sufficient, and whether alternative strategies should be pursued. Carbon-climate models are going to be complex, with the carbon cycle strongly interacting with many other components. Off-line process validation will be insufficient. As was found in coupled atmosphere-ocean GCMs, feedbacks between model components can amplify small errors and uncertainties in one process to produce large biases in the simulated climate. The persistent tropical western Pacific Ocean ''double ITCZ'' and upper troposphere ''cold pole'' problems are examples. Finding and fixing similar types of problems in coupled carbon-climate models especially will be difficult, given the lack of observations required for diagnosis and validation of biogeochemical processes.

Covey, C; Caldeira, K; Guilderson, T; Cameron-Smith, P; Govindasamy, B; Swanston, C; Wickett, M; Mirin, A; Bader, D

2005-05-27T23:59:59.000Z

45

TMA Global Wind Energy Systems | Open Energy Information  

Open Energy Info (EERE)

TMA Global Wind Energy Systems TMA Global Wind Energy Systems Jump to: navigation, search Name TMA Global Wind Energy Systems Place Cheyenne, Wyoming Zip 82001 Sector Wind energy Product Involved in the development, manufacture, and marketing of vertical axis wind energy turbines and hybrid energy systems. References TMA Global Wind Energy Systems[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. TMA Global Wind Energy Systems is a company located in Cheyenne, Wyoming . References ↑ "TMA Global Wind Energy Systems" Retrieved from "http://en.openei.org/w/index.php?title=TMA_Global_Wind_Energy_Systems&oldid=352301" Categories: Clean Energy Organizations Companies Organizations

46

Modeling the earth system  

SciTech Connect (OSTI)

The 1990 Global Change Institute (GCI) on Earth System Modeling is the third of a series organized by the Office for Interdisciplinary Earth Studies to look in depth at particular issues critical to developing a better understanding of the earth system. The 1990 GCI on Earth System Modeling was organized around three themes: defining critical gaps in the knowledge of the earth system, developing simplified working models, and validating comprehensive system models. This book is divided into three sections that reflect these themes. Each section begins with a set of background papers offering a brief tutorial on the subject, followed by working group reports developed during the institute. These reports summarize the joint ideas and recommendations of the participants and bring to bear the interdisciplinary perspective that imbued the institute. Since the conclusion of the 1990 Global Change Institute, research programs, nationally and internationally, have moved forward to implement a number of the recommendations made at the institute, and many of the participants have maintained collegial interactions to develop research projects addressing the needs identified during the two weeks in Snowmass.

Ojima, D. [ed.

1992-12-31T23:59:59.000Z

47

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

48

Exergy-Entropy Process of Global Environmental System  

Science Journals Connector (OSTI)

All of the built environmental spaces, in which we humans spend more than 90 % of the period of our life, are surrounded by the global environmental system. Therefore, we discuss here briefly how the global envir...

Masanori Shukuya

2013-01-01T23:59:59.000Z

49

Modeling the Global Trade and Environmental Impacts of Biofuel Policies |  

Open Energy Info (EERE)

Modeling the Global Trade and Environmental Impacts of Biofuel Policies Modeling the Global Trade and Environmental Impacts of Biofuel Policies Jump to: navigation, search Tool Summary Name: Modeling the Global Trade and Environmental Impacts of Biofuel Policies Agency/Company /Organization: International Food Policy Research Institute Sector: Energy Focus Area: Biomass Topics: Policies/deployment programs, Co-benefits assessment, - Macroeconomic, - Environmental and Biodiversity, Pathways analysis Resource Type: Software/modeling tools, Publications, Lessons learned/best practices Website: www.ifpri.org/sites/default/files/publications/ifpridp01018.pdf RelatedTo: Modeling International Relationships in Applied General Equilibrium (MIRAGE) Modeling the Global Trade and Environmental Impacts of Biofuel Policies Screenshot

50

BETR Global - A geographically explicit global-scale multimedia contaminant fate model  

SciTech Connect (OSTI)

We present two new software implementations of the BETR Global multimedia contaminant fate model. The model uses steady-state or non-steady-state mass-balance calculations to describe the fate and transport of persistent organic pollutants using a desktop computer. The global environment is described using a database of long-term average monthly conditions on a 15{sup o} x 15{sup o} grid. We demonstrate BETR Global by modeling the global sources, transport, and removal of decamethylcyclopentasiloxane (D5).

Macleod, M.; Waldow, H. von; Tay, P.; Armitage, J. M.; Wohrnschimmel, H.; Riley, W.; McKone, T. E.; Hungerbuhler, K.

2011-04-01T23:59:59.000Z

51

Integrated Model to Access the Global Environment | Open Energy Information  

Open Energy Info (EERE)

Integrated Model to Access the Global Environment Integrated Model to Access the Global Environment 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: Integrated Model to Access the Global Environment (IMAGE) Agency/Company /Organization: PBL Netherlands Environmental Assessment Agency Focus Area: Biomass Complexity/Ease of Use: Advanced Website: themasites.pbl.nl/en/themasites/image/index.html Cost: Paid Equivalent URI: cleanenergysolutions.org/content/integrated-model-access-global-enviro Related Tools ENV-Linkages-KEI Model World Induced Technical Change Hybrid (WITCH) Global Trade and Analysis Project (GTAP) Model ... further results IMAGE is an ecological-environmental framework that simulates the

52

Efficient Symbolic Detection of Global Properties in Distributed Systems  

E-Print Network [OSTI]

to total orders containing the happened­before relation. A consistent global state (CGS) of a computation cEfficient Symbolic Detection of Global Properties in Distributed Systems Scott D. Stoller a global state satisfying property \\Phi. Previous general­purpose algorithms for this problem explicitly

Stoller, Scott

53

Climate Models from the Joint Global Change Research Institute  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

Staff at the Joint Institute develop and use models to simulate the economic and physical impacts of global change policy options. The GCAM, for example, gives analysts insight into how regional and national economies might respond to climate change mitigation policies including carbon taxes, carbon trading, and accelerated deployment of energy technology. Three available models are Phoenix, GCAM, and EPIC. Phoenix is a global, dynamic recursive, computable general equilibrium model that is solved in five-year time steps from 2005 through 2100 and divides the world into twenty-four regions. Each region includes twenty-six industrial sectors. Particular attention is paid to energy production in Phoenix. There are nine electricity-generating technologies (coal, natural gas, oil, biomass, nuclear, hydro, wind, solar, and geothermal) and four additional energy commodities: crude oil, refined oil products, coal, and natural gas. Phoenix is designed to answer economic questions related to international climate and energy policy and international trade. Phoenix replaces the Second Generation Model (SGM) that was formerly used for general equilibrium analysis at JGCRI. GCAM is the Global Change Assessment Model, a partial equilibrium model of the world with 14 regions. GCAM operates in 5 year time steps from 1990 to 2095 and is designed to examine long-term changes in the coupled energy, agriculture/land-use, and climate system. GCAM includes a 151-region agriculture land-use module and a reduced form carbon cycle and climate module in addition to its incorporation of demographics, resources, energy production and consumption. The model has been used extensively in a number of assessment and modeling activities such as the Energy Modeling Forum (EMF), the U.S. Climate Change Technology Program, and the U.S. Climate Change Science Program and IPCC assessment reports. GCAM is now freely available as a community model. The Environmental Policy Integrated Climate (EPIC) Model is a process-based agricultural systems model composed of simulation components for weather, hydrology, nutrient cycling, pesticide fate, tillage, crop growth, soil erosion, crop and soil management and economics. Staff at PNNL have been involved in the development of this model by integrating new sub-models for soil carbon dynamics and nitrogen cycling.

54

Posters Cloud Parameterizations in Global Climate Models: The...  

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

3 Posters Cloud Parameterizations in Global Climate Models: The Role of Aerosols J. E. Penner and C. C. Chuang Lawrence Livermore National Laboratory Livermore, California...

55

Solar Radio Burst Effects on Global Positioning System Receivers .  

E-Print Network [OSTI]

??This thesis presents a series of studies investigating solar radio burst effects on Global Positioning System (GPS) receivers along with supporting instrumentation and analysis techniques.… (more)

Cerruti, Alessandro Paolo

2007-01-01T23:59:59.000Z

56

Systems engineering in the global environment : a wicked future.  

SciTech Connect (OSTI)

This presentation discusses the following questions: (1) What are the Global Problems that require Systems Engineering; (2) Where is Systems Engineering going; (3) What are the boundaries of Systems Engineering; (4) What is the distinction between Systems Thinking and Systems Engineering; (5) Can we use Systems Engineering on Complex Systems; and (6) Can we use Systems Engineering on Wicked Problems?

Griego, Regina M.

2010-12-01T23:59:59.000Z

57

Object-Oriented Energy, Climate, and Technology Systems (ObjECTS) Global  

Open Energy Info (EERE)

Object-Oriented Energy, Climate, and Technology Systems (ObjECTS) Global Object-Oriented Energy, Climate, and Technology Systems (ObjECTS) Global Change Assessment Model (GCAM) 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: Object-Oriented Energy, Climate, and Technology Systems (ObjECTS) Global Change Assessment Model (GCAM) Agency/Company /Organization: Pacific Northwest National Laboratory, University of Maryland, Joint Global Change Research Institute Sector: Climate, Energy, Land Focus Area: Non-renewable Energy, Agriculture, Biomass, Forestry, Hydrogen, Transportation Topics: Co-benefits assessment, Pathways analysis Resource Type: Software/modeling tools User Interface: Desktop Application

58

Global Trade and Analysis Project (GTAP) Model | Open Energy Information  

Open Energy Info (EERE)

Global Trade and Analysis Project (GTAP) Model Global Trade and Analysis Project (GTAP) Model 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: Global Trade Analysis Project (GTAP) Model Agency/Company /Organization: Purdue University Sector: Climate, Energy Topics: Baseline projection, - Macroeconomic, Market analysis, Pathways analysis Resource Type: Software/modeling tools User Interface: Desktop Application Complexity/Ease of Use: Moderate Website: www.gtap.agecon.purdue.edu/models/current.asp Cost: Free References: GTAP[1] Related Tools IGES GHG Calculator For Solid Waste ICCT Roadmap Model Applied Dynamic Analysis of the Global Economy (ADAGE) Model

59

Architecting global automation systems over a distributed multi-agent infrastructure  

Science Journals Connector (OSTI)

In this work we present an agent-based architecture for Global Automation Systems. The architecture follows a layered abstract model that allows decoupling design responsibilities, promotes high cohesion within layers and clearly emphasizes the environment. ...

Franco Guidi-Polanco; Claudio Cubillos; Giuseppe Menga

2005-06-01T23:59:59.000Z

60

Development and Application of Earth System Models  

E-Print Network [OSTI]

The global environment is a complex and dynamic system. Earth system modeling is needed to help understand changes in interacting subsystems, elucidate the influence of human activities, and explore possible future changes. ...

Prinn, Ronald G.

Note: This page contains sample records for the topic "global system modeling" 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

Photochemical Numerics for Global-Scale Modeling: Fidelity and GCM Testing  

Science Journals Connector (OSTI)

Atmospheric photochemistry lies at the heart of global-scale pollution problems, but it is a nonlinear system embedded in nonlinear transport and so must be modeled in three dimensions. Total earth grids are massive and kinetics require dozens of ...

Scott Elliott; Xuepeng Zhao; Richard P. Turco; Chih-Yue Jim Kao; Mei Shen

1995-03-01T23:59:59.000Z

62

Globally Collaborative Environmental Peach Gaming with Global University Systems Globally Collaborative Environmental Peace  

E-Print Network [OSTI]

and figures." To realize this, I worked on the proliferations of data telecom infrastructure and email to various countries, and demonstration and testing of hybrid technologies with "Global Lecture Hall (GLH will supply game players from around the world. With global GRID computer networking technology and Beowulf

Paris-Sud XI, Université de

63

4 - Modeling the Relationship Between Global Warming, Violence, and Crime  

Science Journals Connector (OSTI)

Abstract One of the challenges of global warming research to the social sciences is that physical science research modalities are different. Consequently, efforts to tie it to the social sciences, particularly those related to violence and crime, are difficult to develop. This chapter looks at two models to assess the linkages between global warming and crime. The first, the Homer-Dixon model, uses a resource scarcity model to look at these linkages. According to the Homer-Dixon model, many aspects of global warming produce scarcities such as food shortages, ranch and farmland loss, and clean-water shortages. By tracing the indirect effects of scarcities through intervening variables of migration and state hardening, the model allows us to see various kinds of crime and violence that might happen under global warming conditions. The second model is the Agnew model, developed to assess theoretical linkages between crime and global warming, primarily focusing on social disorganization and strain perspectives. The second model fills a critical shortcoming in the first model; it provides a nuanced notion of crime and crime theory. Hence, it provides a needed “back end” of crime outcomes to tie into the Homer-Dixon model. Also, we discuss the way in which many dimensions of global warming can be modeled relatively straightforwardly into a routine activities perspective, where the social and economic disruptions caused by global warming give rise to new patterns of human activity and, consequently, new patterns of criminal and predatory activities.

John P. Crank; Linda S. Jacoby

2015-01-01T23:59:59.000Z

64

Efficient data IO for a Parallel Global Cloud Resolving Model  

Science Journals Connector (OSTI)

Execution of a Global Cloud Resolving Model (GCRM) at target resolutions of 2-4 km will generate, at a minimum, 10s of Gigabytes of data per variable per snapshot. Writing this data to disk, without creating a serious bottleneck in the execution of the ... Keywords: Data formatting, Geodesic grid, Global Cloud Resolving Model, Grid Specifications, High performance IO, Parallel IO libraries

Bruce Palmer; Annette Koontz; Karen Schuchardt; Ross Heikes; David Randall

2011-12-01T23:59:59.000Z

65

Global warming description using Daisyworld model with greenhouse gases  

Science Journals Connector (OSTI)

Abstract Daisyworld is an archetypal model of the earth that is able to describe the global regulation that can emerge from the interaction between life and environment. This article proposes a model based on the original Daisyworld considering greenhouse gases emission and absorption, allowing the description of the global warming phenomenon. Global and local analyses are discussed evaluating the influence of greenhouse gases in the planet dynamics. Numerical simulations are carried out showing the general qualitative behavior of the Daisyworld for different scenarios that includes solar luminosity variations and greenhouse gases effect. Nonlinear dynamics perspective is of concern discussing a way that helps the comprehension of the global warming phenomenon.

Susana L.D. Paiva; Marcelo A. Savi; Flavio M. Viola; Albino J.K. Leiroz

2014-01-01T23:59:59.000Z

66

Development and application of earth system models  

E-Print Network [OSTI]

Development and application of earth system models Ronald G. Prinn *Reprinted from Proceedings, 2011) The global environment is a complex and dynamic system. Earth system modeling is needed to help: globalchange@mit.edu Website: http://globalchange.mit.edu/ #12;Development and application of earth system

67

Development Testing of the Global Climate Model CESM/CAM | Argonne  

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

Development Testing of the Global Climate Model CESM/CAM Development Testing of the Global Climate Model CESM/CAM Event Sponsor: Argonne Leadership Computing Facility Seminar Start Date: Dec 16 2013 - 10:30am Building/Room: Building 240/Room 4301 Location: Argonne National Laboratory Speaker(s): Chris A. Fischer Speaker(s) Title: National Center for Atmospheric Research The Community Earth System Model (CESM) and Community Atmosphere Model (CAM) are community models involving several different developers. With so many different developers it becomes imperative to carry out continuous testing during development. I'll provide a brief introduction to CESM and CAM then cover the testing that is being carried out on both. The Community Earth System Model (CESM) is a global climate model used to predict past, present and future climates. CESM is a fully couple model,

68

Earth System Modeling  

Science Journals Connector (OSTI)

Earth system models are important research tools for improving understanding ... climate system (and maybe never will), Earth system models nowadays typically focus on specific aspects, for...

Patrick Jöckel

2012-01-01T23:59:59.000Z

69

Numerica: a Modeling Language for Global Optimization Pascal Van Hentenryck  

E-Print Network [OSTI]

equilibrium problems, and design problems (e.g., nu­ clear reactor design). The field of global optimizationNumerica: a Modeling Language for Global Optimization Pascal Van Hentenryck Brown University Box or to optimize a nonlinear function subject to nonlinear constraints. This includes appli­ cations

Neumaier, Arnold

70

MODELING THE GLOBAL PEAKS AND COOLING SY  

E-Print Network [OSTI]

of assessed building energy consumption and indoor air temperature peaks. At last, the coupling of the urban energy consumption. Building uses are an important part of the global energy use thus a good conception until the year 2100 highlight a regular increase building energy consumption and indoor At last

Boyer, Edmond

71

Global patterns of nitrogen limitation: confronting two global biogeochemical models with observations  

E-Print Network [OSTI]

representations of Earth System Models have included the carbon (C) cycle (Friedlingstein et al., 2006

Templer, Pamela

72

Global registration of dynamic range scans for articulated model reconstruction  

Science Journals Connector (OSTI)

We present the articulated global registration algorithm to reconstruct articulated 3D models from dynamic range scan sequences. This new algorithm aligns multiple range scans simultaneously to reconstruct a full 3D model from the geometry of these scans. ... Keywords: Range scanning, animation reconstruction, articulated model, nonrigid registration

Will Chang; Matthias Zwicker

2011-05-01T23:59:59.000Z

73

Global ISCCP B1 Browse System | Data.gov  

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

Global ISCCP B1 Browse System Global ISCCP B1 Browse System Agriculture Community Menu DATA APPS EVENTS DEVELOPER STATISTICS COLLABORATE ABOUT Agriculture You are here Data.gov » Communities » Agriculture » Data Global ISCCP B1 Browse System Dataset Summary Description Global full disk satellite images from 1983 to present. Tags {GIBBS,ISCCP,satellite,full-disk,geostationary,infrared,visible,"water vapor",GOES,POES,DMSP,ISCCP,GVI,AVHRR,TOVS,ATOVS,SSM/I,HIRS,AMSU-A,AMSU-B,TIROS,VTPR,GVAR,CLASS,"Scientific data Stewardship",Browse,Images,"Satellite Images","Satellite data"} Dataset Ratings Overall 0 No votes yet Data Utility 0 No votes yet Usefulness 0 No votes yet Ease of Access 0 No votes yet Dataset Additional Information Last Updated 03/08/12 Publisher National Oceanic and Atmospheric Administration, Department of Commerce

74

Global temperatures using satellite and numerical model assimilated data  

SciTech Connect (OSTI)

The Microwave Sounding Unit (MSU) aboard the National Oceanic and Atmospheric Administration (NOAA) series of polar orbiting satellites (TIROS-N to NOAA-11) have provided stable, precise measurements of vertically integrated, atmospheric temperature since December 1978. In this study, comparisons are made between the MSU channel measurements and those derived from the Global Data Assimilation System (GDAS) at the National Meteorological Center (NMC) over the period 1979 to 1990. Land areas rich in Radiosonde Observations (RAOBS) showed similar magnitudes of spatial variability between the NMC GDAS and the MSU temperatures. Excessive spatial variability can be noted in the GDAS over land areas where conventional data is poor. Over the ocean, however, the assimilation of satellite data into the model improves the spatial variability detected by the GDAS.

Basist, A.; Ropelewski, C.; Grody, N. (NOAA/NWS/NMC, Washington, DC (United States) NOAA/NESDIS, Washington, DC (United States))

1994-01-01T23:59:59.000Z

75

Development and application of earth system models  

Science Journals Connector (OSTI)

...that earth system models can...water, and waste disposal...the earth system. Such integrated assessments...simultaneous treatments of the...running “control” experiments...numerical control” experiments...and natural system components...Text 2). Integrated Global System...averaged treatments...roles of plants; the...

Ronald G. Prinn

2013-01-01T23:59:59.000Z

76

Global and Convex Optimization in Modeling Environments ...  

E-Print Network [OSTI]

Aug 12, 2002 ... In this study, a bipolar transistor is modeled by an electrical circuit. .... power, delivered to the radiation resistance Rr, to input electric power.

Administrator

2002-08-16T23:59:59.000Z

77

Robotic Intelligent System | GE Global Research  

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

Imagine an intelligent system managing the surgical tool sterilization process in a hospital-ensuring safe delivery of care, enabling new levels of hospital efficiency and...

78

A BAYESIAN MODEL COMMITTEE APPROACH TO FORECASTING GLOBAL SOLAR RADIATION  

E-Print Network [OSTI]

in the realm of solar radiation forecasting. In this work, two forecasting models: Autoregressive Moving1 A BAYESIAN MODEL COMMITTEE APPROACH TO FORECASTING GLOBAL SOLAR RADIATION. The very first results show an improvement brought by this approach. 1. INTRODUCTION Solar radiation

Boyer, Edmond

79

Building Hierarchical Grid Storage Using the GFARM Global File System  

E-Print Network [OSTI]

-sharing service and the GFARM grid file system; then, it introduces our hybrid architecture. Section 4 gives Work One of the major goals of grid infrastructures is to transparently provide access to comBuilding Hierarchical Grid Storage Using the GFARM Global File System and the JUXMEM Grid Data

Paris-Sud XI, Université de

80

Aviation Safety + Security Program GLOBAL EXPERTS IN SAFETY MANAGEMENT SYSTEMS  

E-Print Network [OSTI]

2010- 2011 Aviation Safety + Security Program GLOBAL EXPERTS IN SAFETY MANAGEMENT SYSTEMS Relevance and currency -- that is what drives the Aviation Safety and Security Program of the USC Viterbi that our core course, Aviation Safety Management Systems, is so necessary in ensuring the safety

Wang, Hai

Note: This page contains sample records for the topic "global system modeling" 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

ExxonMobil Global Energy Management System  

E-Print Network [OSTI]

of our refineries and chemical plants. The system builds on international best practices and benchmarking to identify energy efficiencies. Launched in 2000, it utilizes a common methodology to identify performance gaps, implement closure plans, sustain...

Roberto, F.

82

Accessing Big (Commercial) Data across a Global Research Infrastructure - Modelling Consumer Behaviour in China   

E-Print Network [OSTI]

The use of globally distributed computing systems and globally distributed data to understand and manage global organisations is a well-established vision. It can be found in patents awarded for electrical communications systems that are integrated...

Lloyd, Ashley D.; Antonioletti, Mario A.; Sloan, Terence M.

2014-08-26T23:59:59.000Z

83

An integrated assessment modeling framework for uncertainty studies in global and regional climate change: the MIT IGSM-CAM (version 1.0)  

E-Print Network [OSTI]

This paper describes a computationally efficient framework for uncertainty studies in global and regional climate change. In this framework, the Massachusetts Institute of Technology (MIT) Integrated Global System Model ...

Monier, Erwan

84

Global ocean modeling on the Connection Machine  

SciTech Connect (OSTI)

The authors have developed a version of the Bryan-Cox-Semtner ocean model (Bryan, 1969; Semtner, 1976; Cox, 1984) for massively parallel computers. Such models are three-dimensional, Eulerian models that use latitude and longitude as the horizontal spherical coordinates and fixed depth levels as the vertical coordinate. The incompressible Navier-Stokes equations, with a turbulent eddy viscosity, and mass continuity equation are solved, subject to the hydrostatic and Boussinesq approximations. The traditional model formulation uses a rigid-lid approximation (vertical velocity = 0 at the ocean surface) to eliminate fast surface waves. These waves would otherwise require that a very short time step be used in numerical simulations, which would greatly increase the computational cost. To solve the equations with the rigid-lid assumption, the equations of motion are split into two parts: a set of twodimensional ``barotropic`` equations describing the vertically-averaged flow, and a set of three-dimensional ``baroclinic`` equations describing temperature, salinity and deviations of the horizontal velocities from the vertically-averaged flow.

Smith, R.D.; Dukowicz, J.K.; Malone, R.C.

1993-10-01T23:59:59.000Z

85

Modeling Water Resource Systems under Climate Change: IGSM-WRS  

E-Print Network [OSTI]

Through the integration of a Water Resource System (WRS) component, the MIT Integrated Global System Model (IGSM) framework has been enhanced to study the effects of climate change on managed water-resource systems. ...

Strzepek, K.

86

Mixed finite elements for global tide models  

E-Print Network [OSTI]

We study mixed finite element methods for the linearized rotating shallow water equations with linear drag and forcing terms. By means of a strong energy estimate for an equivalent second-order formulation for the linearized momentum, we prove long-time stability of the system without energy accumulation -- the geotryptic state. A priori error estimates for the linearized momentum and free surface elevation are given in $L^2$ as well as for the time derivative and divergence of the linearized momentum. Numerical results confirm the theoretical results regarding both energy damping and convergence rates.

Cotter, Colin J

2014-01-01T23:59:59.000Z

87

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.

88

Global sensitivity analysis of computer models with functional inputs  

E-Print Network [OSTI]

function. Lastly, the new methodology is applied to an industrial computer code that simulates the nuclear with scalar input variables. For example, in the nuclear engineering domain, global SA tools have been applied (Helton et al. [7]), environmental model of dose calculations (Iooss et al. [10]), reactor dosimetry

Boyer, Edmond

89

Aviation Safety + Security Program GLOBAL EXPERTS IN SAFETY MANAGEMENT SYSTEMS  

E-Print Network [OSTI]

2011- 2012 Aviation Safety + Security Program GLOBAL EXPERTS IN SAFETY MANAGEMENT SYSTEMS of aviation safety. Endings signal new beginnings and new beginnings mean evolving challenges for safety. This was the world in which the USC Aviation Safety and Security Program was born in 1952 and this is the world

Wang, Hai

90

Global Logistics Systems Adapted from an Affiliates seminar  

E-Print Network [OSTI]

Global Logistics Systems Adapted from an Affiliates seminar held at MIT on March 14-15, 2001 #12 to be entered more than 10 times #12;Edmund W. Schuster Director, MIT Affiliates Program in Logistics · The New vary from country to country? · Alliances: What are the trends in logistics alliances? · U

Brock, David

91

Importance of bioenergy markets for the development of the global energy system  

E-Print Network [OSTI]

Importance of bioenergy markets for the development of the global energy system Nicklas Forsell, Bioenergy, TIAM-FR model, bioenergy markets, climate policies Overview Fossil fuels such as oil, coal international bioenergy markets are still in their infancy, international trade of biofuels, wood pellets

Paris-Sud XI, Université de

92

Earth System Science for Global Sustainability: Grand Challenges  

Science Journals Connector (OSTI)

...hydrological systems on seasonal to decadal time scales. Most current efforts to build state-of-the-art whole-Earth system models depart from sophisticated geophysical kernels (coupled atmosphere-ocean models based on exact dynamical equations...

W. V. Reid; D. Chen; L. Goldfarb; H. Hackmann; Y. T. Lee; K. Mokhele; E. Ostrom; K. Raivio; J. Rockström; H. J. Schellnhuber; A. Whyte

2010-11-12T23:59:59.000Z

93

Global Bifurcation of Shilnikov Type in a DoubleGyre Ocean Model  

E-Print Network [OSTI]

1 Global Bifurcation of Shilnikov Type in a Double­Gyre Ocean Model By Balasubramanya T. Nadiga 1 in an ocean basin are studied from a dynamical systems point of view in an effort to better understand its but novel use of power spectra along with dynamical projections of the dynamics suggests that just beyond

Nadiga, Balasubramanya T. "Balu"

94

Description of Atmospheric Conditions at the Pierre Auger Observatory using the Global Data Assimilation System (GDAS)  

SciTech Connect (OSTI)

Atmospheric conditions at the site of a cosmic ray observatory must be known for reconstructing observed extensive air showers. The Global Data Assimilation System (GDAS) is a global atmospheric model predicated on meteorological measurements and numerical weather predictions. GDAS provides altitude-dependent profiles of the main state variables of the atmosphere like temperature, pressure, and humidity. The original data and their application to the air shower reconstruction of the Pierre Auger Observatory are described. By comparisons with radiosonde and weather station measurements obtained on-site in Malargue and averaged monthly models, the utility of the GDAS data is shown.

Abreu, P.; /Lisbon, IST; Aglietta, M.; /Turin U. /INFN, Turin; Ahlers, M.; /Wisconsin U., Madison; Ahn, E.J.; /Fermilab; Albuquerque, I.F.M.; /Sao Paulo U.; Allard, D.; /APC, Paris; Allekotte, I.; /Buenos Aires, CONICET; Allen, J.; /New York U.; Allison, P.; /Ohio State U.; Almela, A.; /Natl. Tech. U., San Nicolas /Buenos Aires, CONICET; Alvarez Castillo, J.; /Mexico U., ICN /Santiago de Compostela U.

2012-01-01T23:59:59.000Z

95

An Evaluation of Tropical Cyclone Genesis Forecasts from Global Numerical Models  

Science Journals Connector (OSTI)

Tropical cyclone (TC) forecasts rely heavily on output from global numerical models. While considerable research has investigated the skill of various models with respect to track and intensity, few studies have considered how well global models ...

Daniel J. Halperin; Henry E. Fuelberg; Robert E. Hart; Joshua H. Cossuth; Philip Sura; Richard J. Pasch

2013-12-01T23:59:59.000Z

96

A Model of Success: The Carnegie Institute for Global Ecology  

E-Print Network [OSTI]

Carnegie Institute for Global Ecology Kirstin Weeks, DavidInstitute for Global Ecology, the answer is an unquali? edremarkable about the Global Ecology building is not only how

Weeks, Kirstin; Lehrer, David; Bean, Jonathan

2007-01-01T23:59:59.000Z

97

Global Health: Response to the AIDS Pandemic — A Global Health Model  

Science Journals Connector (OSTI)

...new infections, two thirds occurred in sub-Saharan Africa. International Response to AIDS — A Global Health Model. It was not until the third decade of the epidemic that the world's public health officials, community leaders, and politicians united to combat AIDS. In 2001, the United Nations General... The HIV–AIDS pandemic is now in its fourth decade. This article describes how HIV–AIDS has been transformed from a death sentence into a manageable illness and outlines the need for continued and coordinated international efforts.

Piot P.; Quinn T.C.

2013-06-06T23:59:59.000Z

98

Selection between foreground models for global 21-cm experiments  

E-Print Network [OSTI]

The precise form of the foregrounds for sky-averaged measurements of the 21-cm line during and before the epoch of reionization is unknown. We suggest that the level of complexity in the foreground models used to fit global 21-cm data should be driven by the data, under a Bayesian model selection methodology. A first test of this approach is carried out by applying nested sampling to simplified models of global 21-cm data to compute the Bayesian evidence for the models. If the foregrounds are assumed to be polynomials of order n in log-log space, we can infer the necessity to use n=4 rather than n=3 with <2h of integration with limited frequency coverage, for reasonable values of the n=4 coefficient. Using a higher-order polynomial does not necessarily prevent a significant detection of the 21-cm signal. Even for n=8, we can obtain very strong evidence distinguishing a reasonable model for the signal from a null model with 128h of integration. More subtle features of the signal may, however, be lost if the...

Harker, Geraint

2015-01-01T23:59:59.000Z

99

An Evaluation of Biomass Energy Potential with a Global Energy and Land Use Model  

Science Journals Connector (OSTI)

The authors evaluate global land use competition and bioenergy potential through developing a global energy and land use model using a SD ... The model describes competition among various uses of biomass such as ...

H. Yamamoto; K. Yamaji

1997-01-01T23:59:59.000Z

100

Cognitive Systems Cognitive Modeling  

E-Print Network [OSTI]

1 Cognitive Systems Cognitive Modeling Foundations of Information Processing in Natural Barkowsky, Christian Freksa 2 Cognitive Systems: Topics · Introduction · Perception · Memory and Reasoning · Learning and Action · Communication · Empirical Methods 3 Cognitive Modeling: Topics · Cognitive

Bremen, Universität

Note: This page contains sample records for the topic "global system modeling" 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

Global horizontal irradiance clear sky models : implementation and analysis.  

SciTech Connect (OSTI)

Clear sky models estimate the terrestrial solar radiation under a cloudless sky as a function of the solar elevation angle, site altitude, aerosol concentration, water vapor, and various atmospheric conditions. This report provides an overview of a number of global horizontal irradiance (GHI) clear sky models from very simple to complex. Validation of clear-sky models requires comparison of model results to measured irradiance during clear-sky periods. To facilitate validation, we present a new algorithm for automatically identifying clear-sky periods in a time series of GHI measurements. We evaluate the performance of selected clear-sky models using measured data from 30 different sites, totaling about 300 site-years of data. We analyze the variation of these errors across time and location. In terms of error averaged over all locations and times, we found that complex models that correctly account for all the atmospheric parameters are slightly more accurate than other models, but, primarily at low elevations, comparable accuracy can be obtained from some simpler models. However, simpler models often exhibit errors that vary with time of day and season, whereas the errors for complex models vary less over time.

Stein, Joshua S.; Hansen, Clifford W.; Reno, Matthew J.

2012-03-01T23:59:59.000Z

102

A Framework for Earth System Model Application Monitoring  

Science Journals Connector (OSTI)

Earth System Model (ESM) is an important tool for the research on global environmental evolution using numerical approach. Here we present a monitoring method for ESM applications based on "Earth System Model Oriented Integrated Developing Environment". ... Keywords: Earth system models, application monitoring, monitoring framework

Ran Yan; Jieqian Wu; Yibo Xie; You Meng; Depei Qian

2013-12-01T23:59:59.000Z

103

Creating security applications based on The Global Certificate Management System  

Science Journals Connector (OSTI)

The Certificate Management System (CMS) is a global network system whose primary services are generation, distribution, storage and verification of certificates. It supports various security applications which use public key cryptography by providing the means for the administration of certificates. This paper describes the interface between security enhanced application and the CMS. The interface layer with which the security applications are extended is named CMS Client. The CMS Client comprises a set of functions that enable the certification of users of security applications, retrieval of certificates and verification of retrieved certificates. The paper gives a short description of the CMS system and a detailed description of the CMS Client functions. Furthermore it describes how to extend the existing or create new security applications based on the CMS system.

Nada Kapidzic

1998-01-01T23:59:59.000Z

104

Wetland model in an earth systems modeling framework for regional environmental policy analysis  

E-Print Network [OSTI]

The objective of this research is to investigate incorporating a wetland component into a land energy and water fluxes model, the Community Land Model (CLM). CLM is the land fluxes component of the Integrated Global Systems ...

Awadalla, Sirein Salah

2011-01-01T23:59:59.000Z

105

Global positioning system recorder and method government rights  

DOE Patents [OSTI]

A global positioning system recorder (GPSR) is disclosed in which operational parameters and recorded positional data are stored on a transferable memory element. Through this transferrable memory element, the user of the GPSR need have no knowledge of GPSR devices other than that the memory element needs to be inserted into the memory element slot and the GPSR must be activated. The use of the data element also allows for minimal downtime of the GPSR and the ability to reprogram the GPSR and download data therefrom, without having to physically attach it to another computer.

Hayes, David W. (Aiken, SC); Hofstetter, Kenneth J. (Aiken, SC); Eakle, Jr., Robert F. (Aiken, SC); Reeves, George E. (Graniteville, SC)

1998-01-01T23:59:59.000Z

106

Building a Global Federation System for Climate Change Research: The Earth System Grid Center for Enabling  

E-Print Network [OSTI]

Building a Global Federation System for Climate Change Research: The Earth System Grid Center for Enabling Technologies (ESG-CET) The Earth System Grid Center for Enabling Technologies Team: R Ananthakrishnan1 , D E Bernholdt7,9 , S Bharathi8 , D Brown5 , M Chen7 , A L Chervenak8 , L Cinquini5 , R Drach3

Chervenak, Ann

107

Nuclear energy conversion systems for arresting global warming  

Science Journals Connector (OSTI)

Presently the global warming by CO2 emission from fossil fuel burning is becoming a serious issue. Especially, coal is the worse fossil fuel, because it emits the largest amount of CO2 per unit amount of heat generation. There seem to be two ways of reducing substantial CO2 emission rate of coal; they are, reforming coal to synthesis fuel with less CO2 emission and removing CO2 from flue gas of coal fired power station after burning coal. Present paper proposes two nuclear heat application systems which reform coal to methanol and four systems which produce chemical products or gasoline with CO2 collected from flue gas of coal fired power stations, as future options for reducing CO2 emission from coal. Advantage and disadvantage of the proposed systems are discussed.

M. Hishida; M. Fumizawa; Y. Inaba; M. Aritomi; S. Nomura; S. Kosaka; S. Yamada; K. Ogata

1997-01-01T23:59:59.000Z

108

E cient Detection of Global Properties in Distributed Systems Using Partial-Order Methods  

E-Print Network [OSTI]

in c that correspond to total orders containing the happened-before relation. A consistent global stateE cient Detection of Global Properties in Distributed Systems Using Partial-Order Methods Scott D "), meaning the system could have passed through a global state satisfying predicate , or Def (read \\de nitely

Stoller, Scott

109

Global Fraud Management System (GFMS) AT&T Global Fraud Management System is a robust suite of data mining and management  

E-Print Network [OSTI]

AT&T technology solutions Global Fraud Management System (GFMS) AT&T Global Fraud Management System is a robust suite of data mining and management applications developed by AT&T Labs to reduce fraud offer a user-friendly interface · Centralized alert manager creates an immediate alert when fraud

Fisher, Kathleen

110

Wide area augmentation of the Global Positioning System  

SciTech Connect (OSTI)

The Wide Area Augmentation System (WAAS) is being deployed by the Federal Aviation Administration (FAA) to augment the Global Positioning System (GPS). The WAAS will aid GPS with the following three services. First, it will broadcast spread-spectrum ranging signals from communication satellites. The airborne WAAS receiver will add these new ranging signals to the GPS constellation of measurements. By so doing, the augmented position fix will be less sensitive to the failure of individual system components, thus improving time availability and continuity of service. Second, the WAAS will use a nationwide ground network to monitor the health of all satellites over the airspace and flag situations which threaten flight safety. This data will be modulated on to the WAAS ranging signals and broadcast to the users, thereby guaranteeing the integrity of the airborne position fix. Third, the WAAS will use the ground network to develop corrections for the errors which currently limit the accuracy of unaugmented GPS. This data will also be included on the WAAS broadcast and will improve position accuracy from approximately 100 m to 8 m. When complete, the augmented system will provide an accurate position fix from satellites to an unlimited number of aircraft across the nation. It will be the primary navigation system for aircraft in oceanic routes, enroute over domestic airspace, in crowded metropolitan airspaces, and on airport approach.

Enge, P.; Walter, T.; Pullen, S.; Kee, C.; Chao, Y.C.; Tsai, Y.J. [Stanford Univ., CA (United States). Dept. of Aeronautics and Astronautics] [Stanford Univ., CA (United States). Dept. of Aeronautics and Astronautics

1996-08-01T23:59:59.000Z

111

California Wintertime Precipitation in Regional and Global Climate Models  

SciTech Connect (OSTI)

In this paper, wintertime precipitation from a variety of observational datasets, regional climate models (RCMs), and general circulation models (GCMs) is averaged over the state of California (CA) and compared. Several averaging methodologies are considered and all are found to give similar values when model grid spacing is less than 3{sup o}. This suggests that CA is a reasonable size for regional intercomparisons using modern GCMs. Results show that reanalysis-forced RCMs tend to significantly overpredict CA precipitation. This appears to be due mainly to overprediction of extreme events; RCM precipitation frequency is generally underpredicted. Overprediction is also reflected in wintertime precipitation variability, which tends to be too high for RCMs on both daily and interannual scales. Wintertime precipitation in most (but not all) GCMs is underestimated. This is in contrast to previous studies based on global blended gauge/satellite observations which are shown here to underestimate precipitation relative to higher-resolution gauge-only datasets. Several GCMs provide reasonable daily precipitation distributions, a trait which doesn't seem tied to model resolution. GCM daily and interannual variability is generally underpredicted.

Caldwell, P M

2009-04-27T23:59:59.000Z

112

Simulated diurnal rainfall physics in a multi-scale global climate model with embedded explicit convection  

E-Print Network [OSTI]

their Community Earth System Model (Richard Neale, personaldevelopment of Earth system models capable of reproducing

Pritchard, Michael Stephen

2011-01-01T23:59:59.000Z

113

Long-memory effects in linear-response models of Earth's temperature and implications for future global warming  

E-Print Network [OSTI]

A linearized energy-balance model for global temperature is formulated, featuring a scale-free long-range memory (LRM) response and stochastic forcing representing the influence on the ocean heat reservoir from atmospheric weather systems. The model is parametrized by an effective response strength, the stochastic forcing strength, and the memory exponent. The instrumental global surface temperature record and the deterministic component of the forcing are used to estimate these parameters by means of the maximum-likelihood method. The residual obtained by subtracting the deterministic solution from the observed record is analyzed as a noise process and shown to be consistent with a long-memory time-series model and inconsistent with a short-memory model. By decomposing the forcing record in contributions from solar, volcanic, and anthropogenic activity one can estimate the contribution of each to 20'th century global warming. The LRM model is applied with a reconstruction of the forcing for the last millenni...

Rypdal, Martin

2013-01-01T23:59:59.000Z

114

Systems Modeling | ornl.gov  

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

Computational Physics Communication Networks and Technologies Modeling and Simulation Innovative Signal Processing Algorithms Advanced Control Systems Econometrics Engineering Analysis Behavioral Sciences Geographic Information Science and Technology Quantum Information Science Supercomputing and Computation Home | Science & Discovery | Supercomputing and Computation | Research Areas | Systems Modeling SHARE Systems Modeling System modeling is the interdisciplinary study of the use of models to conceptualize and construct systems. A common type of systems modeling is function modeling, with specific techniques such as the functional flow block diagram. These models can be extended using functional decomposition, and can be linked to requirements models for further systems

115

Efficient data IO for a Parallel Global Cloud Resolving Model  

SciTech Connect (OSTI)

Execution of a Global Cloud Resolving Model (GCRM) at target resolutions of 2-4 km will generate, at a minimum, 10s of Gigabytes of data per variable per snapshot. Writing this data to disk without creating a serious bottleneck in the execution of the GCRM code while also supporting efficient post-execution data analysis is a significant challenge. This paper discusses an Input/Output (IO) application programmer interface (API) for the GCRM that efficiently moves data from the model to disk while maintaining support for community standard formats, avoiding the creation of very large numbers of files, and supporting efficient analysis. Several aspects of the API will be discussed in detail. First, we discuss the output data layout which linearizes the data in a consistent way that is independent of the number of processors used to run the simulation and provides a convenient format for subsequent analyses of the data. Second, we discuss the flexible API interface that enables modelers to easily add variables to the output stream by specifying where in the GCRM code these variables are located and to flexibly configure the choice of outputs and distribution of data across files. The flexibility of the API is designed to allow model developers to add new data fields to the output as the model develops and new physics is added and also provides a mechanism for allowing users of the GCRM code itself to adjust the output frequency and the number of fields written depending on the needs of individual calculations. Third, we describe the mapping to the NetCDF data model with an emphasis on the grid description. Fourth, we describe our messaging algorithms and IO aggregation strategies that are used to achieve high bandwidth while simultaneously writing concurrently from many processors to shared files. We conclude with initial performance results.

Palmer, Bruce J.; Koontz, Annette S.; Schuchardt, Karen L.; Heikes, Ross P.; Randall, David A.

2011-11-26T23:59:59.000Z

116

Cosmic-ray Driven Outflows in Global Galaxy Disk Models  

E-Print Network [OSTI]

Galactic-scale winds are a generic feature of massive galaxies with high star formation rates across a broad range of redshifts. Despite their importance, a detailed physical understanding of what drives these mass-loaded global flows has remained elusive. In this paper, we explore the dynamical impact of cosmic rays by performing the first three-dimensional, adaptive mesh refinement simulations of an isolated starbursting galaxy that includes a basic model for the production, dynamics and diffusion of galactic cosmic rays. We find that including cosmic rays naturally leads to robust, massive, bipolar outflows from our 10^12 Msun halo, with a mass-loading factor Mout/SFR = 0.3 for our fiducial run. Other reasonable parameter choices led to mass-loading factors above unity. The wind is multiphase and is accelerated to velocities well in excess of the escape velocity. We employ a two-fluid model for the thermal gas and relativistic CR plasma and model a range of physics relevant to galaxy formation, including r...

Salem, Munier

2013-01-01T23:59:59.000Z

117

Intercomparison of the Cloud Water Phase among Global Climate Models  

SciTech Connect (OSTI)

Mixed-phase clouds (clouds that consist of both cloud droplets and ice crystals) are frequently present in the Earth’s atmosphere and influence the Earth’s energy budget through their radiative properties, which are highly dependent on the cloud water phase. In this study, the phase partitioning of cloud water is compared among six global climate models (GCMs) and with Cloud and Aerosol Lidar with Orthogonal Polarization retrievals. It is found that the GCMs predict vastly different distributions of cloud phase for a given temperature, and none of them are capable of reproducing the spatial distribution or magnitude of the observed phase partitioning. While some GCMs produced liquid water paths comparable to satellite observations, they all failed to preserve sufficient liquid water at mixed-phase cloud temperatures. Our results suggest that validating GCMs using only the vertically integrated water contents could lead to amplified differences in cloud radiative feedback. The sensitivity of the simulated cloud phase in GCMs to the choice of heterogeneous ice nucleation parameterization is also investigated. The response to a change in ice nucleation is quite different for each GCM, and the implementation of the same ice nucleation parameterization in all models does not reduce the spread in simulated phase among GCMs. The results suggest that processes subsequent to ice nucleation are at least as important in determining phase and should be the focus of future studies aimed at understanding and reducing differences among the models.

Komurcu, Muge; Storelvmo, Trude; Tan, Ivy; Lohmann, U.; Yun, Yuxing; Penner, Joyce E.; Wang, Yong; Liu, Xiaohong; Takemura, T.

2014-03-27T23:59:59.000Z

118

Asymptotic Behavior of the Global Attractors to the Boussinesq System for Rayleigh-Bnard Convection  

E-Print Network [OSTI]

Asymptotic Behavior of the Global Attractors to the Boussinesq System for Rayleigh study asymptotic behavior of the global attractors to the Boussinesq sys- tem for Rayleigh-Bénard convection at large Prandtl number. In particular, we show that the global attractors to the Boussinesq

Wang, Xiaoming

119

2.5D Building Modeling by Discovering Global Regularities Qian-Yi Zhou  

E-Print Network [OSTI]

2.5D Building Modeling by Discovering Global Regularities Qian-Yi Zhou University of Southern@graphics.usc.edu Abstract We introduce global regularities in the 2.5D building modeling problem, to reflect the orientation of both geometry and human judge- ment. 1. Introduction Building modeling is a critical problem of 3D

Shahabi, Cyrus

120

Numerical Weather Prediction (NWP) and hybrid ARMA/ANN model to predict global radiation  

E-Print Network [OSTI]

Numerical Weather Prediction (NWP) and hybrid ARMA/ANN model to predict global radiation Cyril a hybrid ARMA/ANN model and data issued from a numerical weather prediction model (ALADIN). We particularly@gmail.com #12;Abstract. We propose in this paper an original technique to predict global radiation using

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "global system modeling" 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

GLOBAL EXISTENCE RESULTS FOR THE ANISOTROPIC BOUSSINESQ SYSTEM IN DIMENSION TWO  

E-Print Network [OSTI]

GLOBAL EXISTENCE RESULTS FOR THE ANISOTROPIC BOUSSINESQ SYSTEM IN DIMENSION TWO RAPHA¨EL DANCHIN1 AND MARIUS PAICU2 Abstract. We study the global existence issue for the two-dimensional Boussinesq system. Introduction The Boussinesq system describes the influence of the convection (or convection

Paris-Sud XI, Université de

122

GLOBAL WELL-POSEDNESS FOR THE 2D BOUSSINESQ SYSTEM WITHOUT HEAT DIFFUSION AND WITH EITHER  

E-Print Network [OSTI]

GLOBAL WELL-POSEDNESS FOR THE 2D BOUSSINESQ SYSTEM WITHOUT HEAT DIFFUSION AND WITH EITHER: 612/626-7370 URL: http://www.ima.umn.edu #12;GLOBAL WELL-POSEDNESS FOR THE 2D BOUSSINESQ SYSTEM for the two-dimensional non-diffusive Boussinesq system with viscosity only in the horizontal direction, which

123

THE SECOND LAW OF THERMODYNAMICS AND THE GLOBAL CLIMATE SYSTEM: A REVIEW OF THE MAXIMUM  

E-Print Network [OSTI]

THE SECOND LAW OF THERMODYNAMICS AND THE GLOBAL CLIMATE SYSTEM: A REVIEW OF THE MAXIMUM ENTROPY of the global climate system and those of turbulent fluid systems are reviewed from a thermodynamic viewpoint production, energetics Citation: Ozawa, H., A. Ohmura, R. D. Lorenz, and T. Pujol, The second law

Lorenz, Ralph D.

124

Ionospheric Threat Parameterization for Local Area Global-Positioning-System-Based Aircraft Landing Systems  

E-Print Network [OSTI]

Ionospheric Threat Parameterization for Local Area Global-Positioning-System-Based Aircraft Landing of user separation. The method of data analysis that produced these results is described, and a threat space that parameterizes these possible threats to user integrity is defined. Certain configurations

Stanford University

125

The Physical Properties of the Atmosphere in the New Hadley Centre Global Environmental Model (HadGEM1). Part I: Model Description and Global Climatology  

Science Journals Connector (OSTI)

The atmospheric component of the new Hadley Centre Global Environmental Model (HadGEM1) is described and an assessment of its mean climatology presented. HadGEM1 includes substantially improved representations of physical processes, increased ...

G. M. Martin; M. A. Ringer; V. D. Pope; A. Jones; C. Dearden; T. J. Hinton

2006-04-01T23:59:59.000Z

126

Conditions for the successful deployment of electric vehicles – A global energy system perspective  

Science Journals Connector (OSTI)

In the study, we analyse scenarios of car technology deployment and the global energy system using the Global Multi-regional MARKAL (GMM) cost optimisation model. We consider some of the conditions under which new drivetrain technologies, particularly battery electric vehicles (BEVs), may be more cost competitive under different hypothetical states of the world. We focus on the role of a potential niche market for cars with a limited travel range and how this may affect overall deployment of alternative drivetrain technologies and fuel choice. The results show that assuming a market of substantial size for such short-range cars leads to technologies such as \\{BEVs\\} being deployed more readily. In addition, we show the important role of other factors, such as stringent climate change policy and possible limitations to resource availability, in supporting alternative technologies. This analysis thus identifies potential technology targets for support by decision makers.

Martin Densing; Hal Turton; Georg Bäuml

2012-01-01T23:59:59.000Z

127

FTT:Power : A global model of the power sector with induced technological change and natural resource depletion  

E-Print Network [OSTI]

This work introduces a model of Future Technology Transformations for the power sector (FTT:Power), a representation of global power systems based on market competition, induced technological change (ITC) and natural resource use and depletion. It is the first component of a family of sectoral bottom-up models of technology, designed for integration into the global macroeconometric model E3MG. ITC occurs as a result of technological learning produced by cumulative investment and leads to highly nonlinear, irreversible and path dependent technological transitions. The model uses a dynamic coupled set of logistic differential equations. As opposed to traditional bottom-up energy models based on systems optimisation, such differential equations offer an appropriate treatment of the times and structure of change involved in sectoral technology transformations, as well as a much reduced computational load. Resource use and depletion are represented by local cost-supply curves, which give rise to different regional...

Mercure, J -F

2012-01-01T23:59:59.000Z

128

Final Technical Report for "Radiative Heating Associated with Tropical Convective Cloud Systems: Its Importance at Meso and Global Scales"  

SciTech Connect (OSTI)

Heating associated with tropical cloud systems drive the global circulation. The overall research objectives of this project were to i) further quantify and understand the importance of heating in tropical convective cloud systems with innovative observational techniques, and ii) use global models to determine the large-scale circulation response to variability in tropical heating profiles, including anvil and cirrus cloud radiative forcing. The innovative observational techniques used a diversity of radar systems to create a climatology of vertical velocities associated with the full tropical convective cloud spectrum along with a dissection of the of the total heating profile of tropical cloud systems into separate components (i.e., the latent, radiative, and eddy sensible heating). These properties were used to validate storm-scale and global climate models (GCMs) and were further used to force two different types of GCMs (one with and one without interactive physics). While radiative heating was shown to account for about 20% of the total heating and did not have a strong direct response on the global circulation, the indirect response was important via its impact on convection, esp. in how radiative heating impacts the tilt of heating associated with the Madden-Julian Oscillation (MJO), a phenomenon that accounts for most tropical intraseasonal variability. This work shows strong promise in determining the sensitivity of climate models and climate processes to heating variations associated with cloud systems.

Schumacher, Courtney

2012-12-13T23:59:59.000Z

129

Applied Dynamic Analysis of the Global Economy (ADAGE) Model | Open Energy  

Open Energy Info (EERE)

Applied Dynamic Analysis of the Global Economy (ADAGE) Model Applied Dynamic Analysis of the Global Economy (ADAGE) Model 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: Applied Dynamic Analysis of the Global Economy (ADAGE) Model Agency/Company /Organization: Research Triangle Institute Sector: Climate, Energy Topics: Co-benefits assessment, - Macroeconomic, Pathways analysis Resource Type: Software/modeling tools User Interface: Desktop Application Complexity/Ease of Use: Advanced Website: www.rti.org/page.cfm?objectid=DDC06637-7973-4B0F-AC46B3C69E09ADA9 RelatedTo: Electricity Markets Analysis (EMA) Model Cost: Paid Applied Dynamic Analysis of the Global Economy (ADAGE) Model Screenshot

130

Global sensitivity analysis in the development of first principle-based eutrophication models  

Science Journals Connector (OSTI)

In this work, we formulate a dynamic first principle-based eutrophication model for a reservoir and perform global sensitivity analysis to determine most influential parameters. Both first-order and total sensitivity indices profiles have been calculated ... Keywords: Eutrophication, First principle-based water quality model, Global sensitivity analysis, Sensitivity indices

V. Estrada; M. S. Diaz

2010-12-01T23:59:59.000Z

131

Why are climate models reproducing the observed global surface warming so well?  

E-Print Network [OSTI]

Why are climate models reproducing the observed global surface warming so well? Reto Knutti1 global surface warming so well?, Geophys. Res. Lett., 35, L18704, doi:10.1029/ 2008GL034932. 1 models reproduce the observed surface warming better than one would expect given the uncertainties

Fischlin, Andreas

132

Enabling a Highly-Scalable Global Address Space Model for Petascale Computing  

SciTech Connect (OSTI)

Over the past decade, the trajectory to the petascale has been built on increased complexity and scale of the underlying parallel architectures. Meanwhile, software de- velopers have struggled to provide tools that maintain the productivity of computational science teams using these new systems. In this regard, Global Address Space (GAS) programming models provide a straightforward and easy to use addressing model, which can lead to improved produc- tivity. However, the scalability of GAS depends directly on the design and implementation of the runtime system on the target petascale distributed-memory architecture. In this paper, we describe the design, implementation, and optimization of the Aggregate Remote Memory Copy Interface (ARMCI) runtime library on the Cray XT5 2.3 PetaFLOPs computer at Oak Ridge National Laboratory. We optimized our implementation with the flow intimation technique that we have introduced in this paper. Our optimized ARMCI implementation improves scalability of both the Global Arrays (GA) programming model and a real-world chemistry application NWChem from small jobs up through 180,000 cores.

Apra, Edoardo [ORNL; Vetter, Jeffrey S [ORNL; Yu, Weikuan [ORNL

2010-01-01T23:59:59.000Z

133

Quality Modeling of Water Distribution Systems using Sensitivity Equations  

E-Print Network [OSTI]

Quality Modeling of Water Distribution Systems using Sensitivity Equations P. Fabrie1 ; G. Gancel2 and the associated sensitivity equa- tions are solved for Water Distribution Systems (WDS). A new solution algorithm presented in this study permits global sensitivity analysis of the system to be performed and its efficiency

Boyer, Edmond

134

The First Result of Global Commissioning of the ATALS Endcap Muon Trigger System in ATLAS Cavern  

E-Print Network [OSTI]

The First Result of Global Commissioning of the ATALS Endcap Muon Trigger System in ATLAS Cavern T to the ATLAS cavern by the end of September 2007. To integrate all sub-detectors before the physics run. The first Result of Global Commissioning of the ATALS Endcap Muon Trigger System in ATLAS Cavern I

Fukunaga, Chikara

135

Securing Offshore Infrastructures Through a Global Alert and Graded Response System  

E-Print Network [OSTI]

1 « SARGOS » Securing Offshore Infrastructures Through a Global Alert and Graded Response System and graded response system to answer the recent but strong need for securing critical civilian offshore of their 2009 global safety program (CSOSG). 1. Introduction Offshore oil installations are critical energy

Paris-Sud XI, Université de

136

A Simple Analytical Model for Understanding the Formation of Sea Surface Temperature Patterns under Global Warming  

Science Journals Connector (OSTI)

How sea surface temperature (SST) changes under global warming is critical for future climate projection because SST change affects atmospheric circulation and rainfall. Robust features derived from 17 models of phase 5 of the Coupled Model ...

Lei Zhang; Tim Li

2014-11-01T23:59:59.000Z

137

Diurnal Cycle of Precipitation in the Tropics Simulated in a Global Cloud-Resolving Model  

Science Journals Connector (OSTI)

This study analyzes the diurnal cycle of precipitation simulated in a global cloud-resolving model (GCRM) named the Nonhydrostatic Icosahedral Atmospheric Model (NICAM). A 30-day integration of NICAM successfully simulates the precipitation ...

Tomonori Sato; Hiroaki Miura; Masaki Satoh; Yukari N. Takayabu; Yuqing Wang

2009-09-01T23:59:59.000Z

138

Market power, fuel substitution and infrastructure – A large-scale equilibrium model of global energy markets  

Science Journals Connector (OSTI)

Abstract Assessing and quantifying the impacts of technological, economic, and policy shifts in the global energy system require large-scale numerical models. We propose a dynamic multi-fuel market equilibrium model that combines endogenous fuel substitution within demand sectors and in power generation, detailed infrastructure capacity constraints and investment, as well as strategic behaviour and market power aspects by suppliers in a unified framework. This model is the first of its kind in which market power is exerted across several fuels. Using a data set based on the IEA (International Energy Agency) World Energy Outlook 2013 (New Policies scenario, time horizon 2010–2050, 30 regions, 10 fuels), we illustrate the functionality of the model in two scenarios: a reduction of shale gas availability in the US relative to current projections leads to an even stronger increase of power generation from natural gas in the European Union relative to the base case; this is due to a shift in global fossil fuel trade. In the second scenario, a tightening of the EU ETS emission cap by 80% in 2050 combined with a stronger biofuel mandate spawns a renaissance of nuclear power after 2030 and a strong electrification of the transportation sector. We observe carbon leakage rates from the unilateral mitigation effort of 60–70%.

Daniel Huppmann; Ruud Egging

2014-01-01T23:59:59.000Z

139

Special feature: Creating security applications based on The Global Certificate Management System  

Science Journals Connector (OSTI)

The Certificate Management System (CMS) is a global network system whose primary services are generation, distribution, storage and verification of certificates. It supports various security applications which use public key cryptography by providing ...

Nada Kapidzic

1998-01-01T23:59:59.000Z

140

Dynamical Modeling of Economy in Global Nuclear Energy Market  

Science Journals Connector (OSTI)

Non-linear dynamical analysis for the global nuclear energy market is investigated. Currently, the market means a different characteristics comparing to the ... between two countries, which depends on the energy ...

Taeho Woo

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "global system modeling" 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

The use and misuse of Vc,max in Earth System Models Alistair Rogers  

E-Print Network [OSTI]

REVIEW The use and misuse of Vc,max in Earth System Models Alistair Rogers Received: 18 November Dordrecht (outside the USA) 2013 Abstract Earth System Models (ESMs) aim to project global change. Central Á Vc,max Á Leaf nitrogen Á Earth System Models Introduction The primary goal of Earth System Models

Rogers, Alistair

142

Chapter 1: Operating System Models 1 Operating System Models  

E-Print Network [OSTI]

Chapter 1: Operating System Models 1 2 Operating System Models 2.1 Introduction Over the past several years, a number of trends affecting operating system design are witnessed and foremost among them is a move towards modularity. Operating systems such as Microsofts Windows, IBMs OS/2, C-DACs PARAS

Melbourne, University of

143

Judging model reduction of complex systems  

Science Journals Connector (OSTI)

Model reduction is a common goal in the study of complex systems, consisting of many components with a complex interaction structure. The quality of such reduction, however, may not be reflected correctly in the stepwise prediction error in the model since it ignores the global geometry of the dynamics. Here we introduce a general two-step framework, consisting of dimensionality reduction of the time series followed by modeling of the resulting time series, and propose the use of the shadowing distance to measure the quality of the second step. Using coupled oscillator networks as a prototypical example, we demonstrate that our approach can outperform those based on stepwise error and suggest that it sheds light on the problem of identifying and modeling low-dimensional dynamics in large-scale complex systems.

Jie Sun; Erik M. Bollt; Takashi Nishikawa

2011-04-27T23:59:59.000Z

144

Decoding {beta}-decay systematics: A global statistical model for {beta}{sup -} half-lives  

SciTech Connect (OSTI)

Statistical modeling of nuclear data provides a novel approach to nuclear systematics complementary to established theoretical and phenomenological approaches based on quantum theory. Continuing previous studies in which global statistical modeling is pursued within the general framework of machine learning theory, we implement advances in training algorithms designed to improve generalization, in application to the problem of reproducing and predicting the half-lives of nuclear ground states that decay 100% by the {beta}{sup -} mode. More specifically, fully connected, multilayer feed-forward artificial neural network models are developed using the Levenberg-Marquardt optimization algorithm together with Bayesian regularization and cross-validation. The predictive performance of models emerging from extensive computer experiments is compared with that of traditional microscopic and phenomenological models as well as with the performance of other learning systems, including earlier neural network models as well as the support vector machines recently applied to the same problem. In discussing the results, emphasis is placed on predictions for nuclei that are far from the stability line, and especially those involved in r-process nucleosynthesis. It is found that the new statistical models can match or even surpass the predictive performance of conventional models for {beta}-decay systematics and accordingly should provide a valuable additional tool for exploring the expanding nuclear landscape.

Costiris, N. J.; Mavrommatis, E.; Gernoth, K. A.; Clark, J. W. [Physics Department, Division of Nuclear Physics and Particle Physics, University of Athens, GR-15771 Athens (Greece); Institut fuer Theoretische Physik, Johannes-Kepler-Universitaet, A-4040 Linz (Austria) and School of Physics and Astronomy, Schuster Building, University of Manchester, Manchester, M13 9PL (United Kingdom); McDonnell Center for the Space Sciences and Department of Physics, Washington University, St. Louis, Missouri 63130 (United States); Complexo Interdisciplinar, Centro de Mathematica e Aplicacoes Fundamentals, University of Lisbon, 1649-003 Lisbon (Portugal) and Departamento de Fisica, Instituto Superior Tecnico, Technical University of Lisbon, 1096 Lisbon (Portugal)

2009-10-15T23:59:59.000Z

145

Space Power System Modeling with EBAL  

SciTech Connect (OSTI)

Pratt and Whitney Rocket dyne's Engine Balance (EBAL) thermal/fluid system code has been expanded to model nuclear power closed Brayton cycle (CBC) power conversion systems. EBAL was originally developed to perform design analysis of hypersonic vehicle propellant and thermal management systems analysis. Later, it was adapted to rocket engine cycles. The new version of EBAL includes detailed, physics-based models of all key CBC system components. Some component examples are turbo-alternators, heat exchangers, heat pipe radiators, and liquid metal pumps. A liquid metal cooled reactor is included and a gas cooled reactor model is in work. Both thermodynamic and structural analyses are performed for each component. EBAL performs steady-state design analysis with optimization as well as off-design performance analysis. Design optimization is performed both at the component level by the component models and on the system level with a global optimizer. The user has the option to manually drive the optimization process or run parametric analysis to better understand system trade-off. Although recent EBAL developments have focused on a CBC conversion system, the code is easily extendible to other power conversion cycles. This new, more powerful version of EBAL allows for rapid design analysis and optimization of space power systems. A notional example of EBAL's capabilities is included. (authors)

Zillmer, Andrew; Hanks, David; Wen-Hsiung 'Tony' Tu [Pratt and Whitney Rocketdyne, 6633 Canoga Avenue MC LA 13, PO Box 7922, Canoga Park, CA 91309 (United States)

2006-07-01T23:59:59.000Z

146

Trend analysis from 1970 to 2008 and model evaluation of EDGARv4 global gridded  

E-Print Network [OSTI]

Trend analysis from 1970 to 2008 and model evaluation of EDGARv4 global gridded anthropogenic.J. Olivier, Diego Guizzardi, Rob Maas and Frank Dentener *Reprinted from Science of the Total Environment Program on the Science and Policy of Global Change combines cutting-edge scientific research

147

SO2 emissions and lifetimes: Estimates from inverse modeling using in situ and global, spacebased  

E-Print Network [OSTI]

SO2 emissions and lifetimes: Estimates from inverse modeling using in situ and global, spacebased 18 March 2011. [1] Topdown constraints on global sulfur dioxide (SO2) emissions are inferred through of GEOSChem for inversion of SO2 columns to emissions. The seasonal mean SO2 lifetime calculated with the GEOS

Martin, Randall

148

The China-in-Global Energy Model Tianyu Qi, Niven Winchester, Da Zhang,  

E-Print Network [OSTI]

toward a global response to climate change. To this end, the Program brings together an interdisciplinary: Massachusetts Institute of Technology 77 Massachusetts Avenue, E19-411 Cambridge, MA 02139 (USA) Location-intensive sectors ­ to analyze global energy demand, CO2 emissions, and economic activity. The C-GEM model supplies

149

Does aquaculture add resilience to the global food system?  

Science Journals Connector (OSTI)

...g., those sheltered from wind and wave exposure, aligned...forcing aquaculture further offshore. In Africa, where the need for aquaculture...relies on fertilizer inputs and farm-made feeds to enhance fish growth, particularly...tonnes (21). ¶ The volume of farm-made feeds used in the global...

Max Troell; Rosamond L. Naylor; Marc Metian; Malcolm Beveridge; Peter H. Tyedmers; Carl Folke; Kenneth J. Arrow; Scott Barrett; Anne-Sophie Crépin; Paul R. Ehrlich; Åsa Gren; Nils Kautsky; Simon A. Levin; Karine Nyborg; Henrik Österblom; Stephen Polasky; Marten Scheffer; Brian H. Walker; Tasos Xepapadeas; Aart de Zeeuw

2014-01-01T23:59:59.000Z

150

220 Communications of the Association for Information Systems (Volume 13, 2004)220-232 The Australian Produce Co-Operative; A Global Information Systems Project by H. Lehmann  

E-Print Network [OSTI]

is intertwined with the pre-existing politically charged environment that characterizes the global firm. Further an international information system as it follows APCO's global system development. It shows the difficulties systems implementation, multinational companies, politics in multinational companies, international

Bieber, Michael

151

Global existence and uniqueness for a non linear Boussinesq system in dimension two  

E-Print Network [OSTI]

We study the global well-posedness of a two-dimensional Boussinesq system which couples the incompressible Euler equation for the velocity and a transport equation with fractional diffusion of type $|\\DD|^{\\alpha}$ for the temperature. We prove that for $\\alpha>1,$ there exists a unique global solution for initial data with critical regularities.

Sulaiman, Samira

2012-01-01T23:59:59.000Z

152

The West African port system: global insertion and regional particularities Jean Debrie  

E-Print Network [OSTI]

1 The West African port system: global insertion and regional particularities Jean Debrie jean.debrie@ifsttar.fr Chargé de recherche Université Paris Est, IFSTTAR, SPLOTT Introduction. Port networks: a global change accompanied by a change in the morphology of the networks that serve ports. Shipping lines and container

Paris-Sud XI, Université de

153

Background: Global Warming, 2009 1. Unequivocally, the climate is warming. Natural systems are affected.  

E-Print Network [OSTI]

Background: Global Warming, 2009 1. Unequivocally, the climate is warming. Natural systems are affected. 2. Very likely (>90% certainty), humans are causing most of the warming. 3. No single technology are very likely to impose net annual costs, which will increase over time as global temperatures increase

Minnesota, University of

154

Global distribution of N2O emissions from aquatic systems: natural emissions and anthropogenic eects  

E-Print Network [OSTI]

Global distribution of N2O emissions from aquatic systems: natural emissions and anthropogenic, are increasing due to human activities. Our analysis suggests that a third of global anthropogenic N2O emission the remainder. Over 80% of aquatic anthropogenic N2O emissions are from the Northern Hemisphere mid

Seitzinger, Sybil

155

WWLL global lightning detection system: Regional validation study in Erin H. Lay,1,2  

E-Print Network [OSTI]

convective rainfall as well as to predict flash flooding [Tapia et al., 1998]. Global lightning data couldWWLL global lightning detection system: Regional validation study in Brazil Erin H. Lay,1,2 Robert] An experimental lightning detection network, the World Wide Lightning Location network (WWLL), is being developed

Thomas, Jeremy N.

156

Global tracking control of underactuated ships with nonzero off-diagonal terms in their system matrices  

Science Journals Connector (OSTI)

A methodology is proposed to design a controller that forces position and orientation of underactuated ships to globally track a reference trajectory. The ships under consideration are not actuated in the sway direction, and the mass and damping matrices ... Keywords: Global tracking control, Nonzero off-diagonal terms, System matrices, Underactuated ships

K. D. Do; J. Pan

2005-01-01T23:59:59.000Z

157

Cost-Effective Choices of Marine Fuels in a Carbon-Constrained World: Results from a Global Energy Model  

Science Journals Connector (OSTI)

Cost-Effective Choices of Marine Fuels in a Carbon-Constrained World: Results from a Global Energy Model ... † Department

Maria Taljegard; Selma Brynolf; Maria Grahn; Karin Andersson; Hannes Johnson

2014-10-06T23:59:59.000Z

158

A fast global optimization approach to VAR planning for the large scale electric power systems  

SciTech Connect (OSTI)

In this paper, an innovative fast global optimization technique, Hybrid Partial Gradient Descent/Simulated Annealing (HPGDSA), for optimal VAR planning is presented. The HPGDSA is introduced to search the global optimal solution considering both quality and speed at the same time. The basic idea of the HPGDSA is that partial gradient descent and simulated annealing alternate with each other such that it reduces the CPU time of the conventional Simulated Annealing (SA) method while retaining the main characteristics of SA, i.e., the ability to get the global optimal solution. The HPGDSA was applied to a practical power system, Taiwan Power System (Tai-Power System), with satisfactory results.

Liu, C.W.; Jwo, W.S.; Liu, C.C. [National Taiwan Univ., Taipei (Taiwan, Province of China). Dept. of Electrical Engineering; Hsiao, Y.T. [Tamkang Univ., Taipei (Taiwan, Province of China). Dept. of Electrical Engineering

1997-02-01T23:59:59.000Z

159

SEESM: Scalable Extensible Earth System Model for Climate Change Science |  

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

SEESM: Scalable Extensible Earth System Model for Climate Change Science SEESM: Scalable Extensible Earth System Model for Climate Change Science SEESM: Scalable Extensible Earth System Model for Climate Change Science This SciDAC project will transform an existing, state-of-the-science, third-generation global climate model, the Community Climate System Model (CCSM3), into a first-generation Earth system model that fully simulates the relationships between the physical, chemical, and bio-geochemical processes in the climate system. The model will incorporate new processes necessary to predict future climates based on the specification of greenhouse gas emissions rather than specification of atmospheric concentrations, as is done in present models, which make assumptions about the carbon cycle that are likely not valid. This project will include comprehensive treatments of the processes

160

Adjustment and Sensitivity Analyses of a Beta Global Rangeland Model Randall B. Boone1  

E-Print Network [OSTI]

1 Adjustment and Sensitivity Analyses of a Beta Global Rangeland Model Randall B. Boone1 , Richard Institute, P.O. Box 30709, Nairobi 00100, Kenya Contact R.B. Boone at: Randall.Boone@ColoState.edu August 31

Boone, Randall B.

Note: This page contains sample records for the topic "global system modeling" 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

On the Contribution of Longwave Radiation to Global Climate Model Biases in Arctic Lower Tropospheric Stability  

Science Journals Connector (OSTI)

Previous research has found that global climate models (GCMs) usually simulate greater lower tropospheric stabilities compared to reanalysis data. To understand the origins of this bias, the authors examine hindcast simulations initialized with ...

Neil P. Barton; Stephen A. Klein; James S. Boyle

2014-10-01T23:59:59.000Z

162

Implementation of a Stochastic Eddy-Diffusivity/Mass-Flux Parameterization into the Navy Global Environmental Model  

Science Journals Connector (OSTI)

A unified boundary layer and shallow convection parameterization based on a stochastic eddy-diffusivity/mass-flux (EDMF) approach is implemented and tested in the Navy Global Environmental Model (NAVGEM). The primary goals of this work are to ...

Kay Sušelj; Timothy F. Hogan; João Teixeira

2014-12-01T23:59:59.000Z

163

Oceanic transports of heat and salt from a global model and data  

E-Print Network [OSTI]

A state estimate produced by ECCO-GODAE from a global one-degree model and data spanning the years 1992-2005 is analyzed in terms of transports of volume, temperature, and freshwater. The estimate is assessed to be ...

Olson, Elise

2006-01-01T23:59:59.000Z

164

Representing Variability in Subgrid Snow Cover and Snow Depth in a Global Land Model: Offline Validation  

Science Journals Connector (OSTI)

Subgrid snow cover is one of the key parameters in global land models since snow cover has large impacts on the surface energy and moisture budgets, and hence the surface temperature. In this study, the Subgrid Snow Distribution (SSNOWD) snow ...

T. Nitta; K. Yoshimura; K. Takata; R. O’ishi; T. Sueyoshi; S. Kanae; T. Oki; A. Abe-Ouchi; G. E. Liston

2014-05-01T23:59:59.000Z

165

Prediction and Optimization of Global Systems using Mathematical...  

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

Environmental modeling and spatio-temporal analyses create the support of thermal rating model and renewable energy production forecasting. For example wind speed and direction...

166

Relating geo-meteorological parameters to global solar radiation for Egypt by Iranna-Bapat's estimation models  

Science Journals Connector (OSTI)

Estimation of solar radiation is considered as the most important parameter for the design and development of various solar energy systems. But, the availability of the required data is very scarce and often not readily accessible. The foremost objective of the present study was to estimate the monthly average global solar radiation (GSR) at various locations for Egypt, by the generalised Iranna-Bapat's model. Iranna-Bapat's model is developed to estimate the value of global solar radiation at any location on earth surface. This model uses the most commonly measurable meteorological parameters such as ambient temperature, humidity, windspeed, moisture for a given location. A total of 11 locations spread across the country are used to validate this model. The computed values from Iranna-Bapat's model are compared with the measured values. Iranna-Bapat's model demonstrated acceptable results, and statistically displayed lower RMSE. Therefore this model could be a good estimator for predicting the global solar radiation at other locations for Egypt, where such data is not available.

Iranna Korachagaon; V.N. Bapat

2013-01-01T23:59:59.000Z

167

The use and misuse of V c,max in Earth System Models  

Science Journals Connector (OSTI)

Earth System Models (ESMs) aim to project global change....V c,max, is a key parameter in the FvCB model. This study investigated the derivation of the values of V c,max used to re...

Alistair Rogers

2014-02-01T23:59:59.000Z

168

Systems Advisor Model | Department of Energy  

Energy Savers [EERE]

Systems Advisor Model Systems Advisor Model Systems Advisor Model (SAM) makes performance predictions and cost of energy estimates for grid-connected power projects based on...

169

System Optimization - The Global Approach to HVAC Control  

E-Print Network [OSTI]

System Optimization is a new approach to HVAC control as implemented by Energy Management Control Systems. System Optimization is defined as electronic building control strategies which treat a building's HVAC components as a complete energy...

Thielman, D. E.

1984-01-01T23:59:59.000Z

170

The MAGS Integrated Modeling System  

Science Journals Connector (OSTI)

The Mackenzie GEWEX Study (MAGS) integrated modeling system was developed to couple, with full feedback, selected atmospheric and hydrologic models, with the expectation that the imposed consistency will enhan...

E. D. (Ric) Soulis; Frank R. Seglenieks

2008-01-01T23:59:59.000Z

171

GLOBAL STABILITY IN CHEMOSTAT-TYPE COMPETITION MODELS WITH NUTRIENT RECYCLING  

E-Print Network [OSTI]

GLOBAL STABILITY IN CHEMOSTAT-TYPE COMPETITION MODELS WITH NUTRIENT RECYCLING SHIGUI RUAN AND XUE- type competition models with nutrient recycling. In the first model the recycling is instantaneous, whereas in the second, the recycling is delayed. They carried out the equilibrium analysis and obtained

Ruan, Shigui

172

Macro-System Model Overview  

Broader source: Energy.gov [DOE]

Presentation on Macro-System Model Overview given by Mark Ruth of the National Renewable Energy Laboratory during the DOE Hydrogen Transition Analysis Workshop on January 26, 2006.

173

Think Global, Act Local: Implementing Model Management with  

E-Print Network [OSTI]

,5 Thomas Reiter1 , Werner Retschitzegger2 Information Systems Group (IFS) Johannes Kepler University Linz

Hochreiter, Sepp

174

GLOBAL WELL-POSEDNESS FOR THE 2D BOUSSINESQ SYSTEM WITHOUT HEAT DIFFUSION AND WITH EITHER  

E-Print Network [OSTI]

GLOBAL WELL-POSEDNESS FOR THE 2D BOUSSINESQ SYSTEM WITHOUT HEAT DIFFUSION AND WITH EITHER-diffusive Boussinesq system with viscosity only in the horizontal direction, which arises in Ocean dynamics. This work for the Boussinesq system with anisotropic viscosity and zero diffusion. Al- though we follow some of their ideas

Larios, Adam

175

Tropical Cyclone Data Assimilation: Experiments with a Coupled Global-Limited-Area Analysis System  

E-Print Network [OSTI]

analysis system at horizontal resolution T62 and a limited-area analysis system at resolutions from 200 km to 36 km. The global and limited-area DA systems, which are both based on the Local Ensemble Transform Kalman Filter algorithm, are implemented using...

Holt, Christina

2014-04-22T23:59:59.000Z

176

Optimization of global model composed of radial basis functions using the term-ranking approach  

SciTech Connect (OSTI)

A term-ranking method is put forward to optimize the global model composed of radial basis functions to improve the predictability of the model. The effectiveness of the proposed method is examined by numerical simulation and experimental data. Numerical simulations indicate that this method can significantly lengthen the prediction time and decrease the Bayesian information criterion of the model. The application to real voice signal shows that the optimized global model can capture more predictable component in chaos-like voice data and simultaneously reduce the predictable component (periodic pitch) in the residual signal.

Cai, Peng; Tao, Chao, E-mail: taochao@nju.edu.cn; Liu, Xiao-Jun [Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093 (China)] [Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093 (China)

2014-03-15T23:59:59.000Z

177

Towards a Fine-Resolution Global Coupled Climate System for Prediction on Decadal/Centennial Scales  

SciTech Connect (OSTI)

The over-arching goal of this project was to contribute to the realization of a fully coupled fine resolution Earth System Model simulation in which a weather-scale atmosphere is coupled to an ocean in which mesoscale eddies are largely resolved. Both a prototype fine-resolution fully coupled ESM simulation and a first-ever multi-decadal forced fine-resolution global coupled ocean/ice simulation were configured, tested, run, and analyzed as part of this grant. Science questions focused on the gains from the use of high horizontal resolution, particularly in the ocean and sea-ice, with respect to climatically important processes. Both these fine resolution coupled ocean/sea ice and fully-coupled simulations and precedent stand-alone eddy-resolving ocean and eddy-permitting coupled ocean/ice simulations were used to explore the high resolution regime. Overall, these studies showed that the presence of mesoscale eddies significantly impacted mixing processes and the global meridional overturning circulation in the ocean simulations. Fourteen refereed publications and a Ph.D. dissertation resulted from this grant.

McClean, Julie L. [Scripps Institution of Oceanography] [Scripps Institution of Oceanography

2013-11-14T23:59:59.000Z

178

Posters Toward an Operational Water Vapor Remote Sensing System Using the Global Positioning System  

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

3 3 Posters Toward an Operational Water Vapor Remote Sensing System Using the Global Positioning System S. I. Gutman, (a) R. B. Chadwick, (b) and D. W. Wolf (c) National Oceanic and Atmospheric Administration Boulder, Colorado A. Simon Cooperative Institute for Research in Environmental Science Boulder, Colorado T. Van Hove and C. Rocken University Navstar Consortium Boulder, Colorado Background Water vapor is one of the most important constituents of the free atmosphere since it is the principal mechanism by which moisture and latent heat are transported and cause "weather." The measurement of atmospheric water vapor is essential for weather and climate research as well as for operational weather forecasting. An important goal in modern weather prediction is to improve the accuracy of short-term

179

Modeling aviation's global emissions, uncertainty analysis, and applications to policy  

E-Print Network [OSTI]

(cont.) fuel burn results below 3000 ft. For emissions, the emissions indices were the most influential uncertainties for the variance in model outputs. By employing the model, this thesis examined three policy options for ...

Lee, Joosung Joseph, 1974-

2005-01-01T23:59:59.000Z

180

A globally convergent steering algorithm for regular nonholonomic systems  

E-Print Network [OSTI]

unless each trailer is hinged to the midpoint of the previous wheel axle -- a particular arrangement-called plate-ball system, does not admit a chained-form transformation. More in general, for 2-input systems

Sontag, Eduardo

Note: This page contains sample records for the topic "global system modeling" 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

Development and application of earth system models  

Science Journals Connector (OSTI)

...Development and application of earth system models 10.1073/pnas.1107470109...to climate mitigation that earth system models can help inform. These models...processes. Why do we need earth system models (ESMs)? First, such models...

Ronald G. Prinn

2013-01-01T23:59:59.000Z

182

Systems approaches in global change and biogeochemistry research  

Science Journals Connector (OSTI)

...specialists took a systems approach to examine ecosystem...multi-disciplinary approaches are becoming ever more...By improving land management technology, SOC stocks...characteristics of systems science (e.g. inter-disciplinary...through adopting systems approaches; indeed, many of the...

2012-01-01T23:59:59.000Z

183

Centennial Variations of the Global Monsoon Precipitation in the Last Millennium: Results from ECHO-G Model  

E-Print Network [OSTI]

Centennial Variations of the Global Monsoon Precipitation in the Last Millennium: Results from ECHO-G with the ECHAM and the global Hamburg Ocean Primitive Equation (ECHO-G) coupled ocean­atmosphere model

Wang, Bin

184

The global geochemical cycles of iron and calcium: using novel isotope systems to understand weathering, global mass budgets, natural reaction rates, and paleoclimate  

E-Print Network [OSTI]

. Traditional geochemical proxies utilize variations in the oxygen, carbon, and boron isotopic compositionThe global geochemical cycles of iron and calcium: using novel isotope systems to understand of California, Berkeley Spring 2005 #12;The global geochemical cycles of iron and calcium: using novel isotope

Fantle, Matthew

185

Effective thermal conduction model for estimating global warming  

Science Journals Connector (OSTI)

This paper presents a simple way to approximate the dependence of the global mean air temperature at Earth’s surface on the atmospheric concentration of carbon dioxide. It treats the atmosphere as a blanket the effective thermal conductivity of which is a decreasing function of the amount of CO 2 present and does not involve the details of energy transport. The only data required are the CO 2 concentrations at the middle of the nineteenth and the end of the twentieth centuries and the shift in temperature that has occurred over that time. This elementary phenomenological energy-balance approach is well suited for undergraduate physics courses to illustrate thermal conduction and radiation by way of the very interesting and critically important example of greenhouse warming of Earth.

Anthony B. Wolbarst

1999-01-01T23:59:59.000Z

186

Model system for slow dynamics  

Science Journals Connector (OSTI)

Systems whose dynamics are described by a quasilogarithmic or stretched-exponential time dependence are usually fitted by models which use disorder to create a distribution of relaxation times. Here we describe a model which decays slowly towards equilibrium but does not require disorder to provide the slow dynamics. The model consists of a spin system with the spins interacting via the dipole-dipole interaction. The model is able to replicate the more pronounced features observed in the magnetization decay of magnetic systems and high-temperature superconductors.

D. K. Lottis; R. M. White; E. Dan Dahlberg

1991-07-15T23:59:59.000Z

187

Dropouts of the outer electron radiation belt in response to solar wind stream interfaces: global positioning system observations  

Science Journals Connector (OSTI)

...radiation belt in response to solar wind stream interfaces: global...Calgary, Calgary, Alberta, Canada We present a statistical study...examined statistically for 67 solar wind stream interfaces (SIs...global positioning system|solar wind| 1. Introduction (a...

2010-01-01T23:59:59.000Z

188

An object-oriented process tracking system for a distributed system without global clock  

E-Print Network [OSTI]

mechanisms of information collection, such as the client-server model with 4. 3 BSD sockets, message queues and RPCs, and the display of the infor- mation in a graphical manner using the X window system. In designing any process tracking system.... An application may be executed on another machine, sending requests across the network to the particular display and receiving keyboard and pointer events from the system controlling the display. The program that controls each display is known as a server. TCP...

Viswanathan, Rajeswaran

1995-01-01T23:59:59.000Z

189

Global tropospheric ozone modeling: Quantifying errors due to grid resolution  

E-Print Network [OSTI]

model-derived monthly climatologies [Tegen et al. , 1997],extent that the MODIS climatology does. [ 11 ] The standarduse the optional aerosol climatology. These simulations are

Wild, Oliver; Prather, Michael J

2006-01-01T23:59:59.000Z

190

The global change research center atmospheric chemistry model  

SciTech Connect (OSTI)

This work outlines the development of a new model of the chemistry of the natural atmosphere. The model is 2.5-dimensional, having spatial coordinates height, latitude, and, the half-dimension, land and ocean. The model spans both the troposphere and stratosphere, although the troposphere is emphasized and the stratosphere is simple and incomplete. The chemistry in the model includes the O{sub x}, HO{sub x}, NO{sub x}, and methane cycles in a highly modular fashion which allows model users great flexibility in selecting simulation parameters. A detailed modeled sensitivity analysis is also presented. A key aspect of the model is its inclusion of clouds. The model uses current understanding of the distribution and optical thickness of clouds to determine the true radiation distribution in the atmosphere. As a result, detailed studies of the radiative effects of clouds on the distribution of both oxidant concentrations and trace gas removal are possible. This work presents a beginning of this study with model results and discussion of cloud effects on the hydroxyl radical.

Moraes, F.P. Jr.

1995-01-01T23:59:59.000Z

191

Effects of Global Climate on Infectious Disease: the Cholera Model  

Science Journals Connector (OSTI)

...impossible to predict precisely the...building predictive models for disease...events and cholera outbreaks have been increasing...Bangladesh, cholera outbreaks are related to...the nonlinear models, and interannual...variability of cholera outbreaks (124). Because...to use ENSO to predict variability in...

Erin K. Lipp; Anwar Huq; Rita R. Colwell

2002-10-01T23:59:59.000Z

192

Earth System Models  

Science Journals Connector (OSTI)

Earth system analysis — this term is often associated with the study of the ‘solid’ Earth with its surrounding spheres, the atmosphere, cryosphere, and hydrosphere. However, within IGBP (the International Geos...

Martin Clussen

2001-01-01T23:59:59.000Z

193

Regional forecasting with global atmospheric models; Final report  

SciTech Connect (OSTI)

The purpose of the project was to conduct model simulations for past and future climate change with respect to the proposed Yucca Mtn. repository. The authors report on three main topics, one of which is boundary conditions for paleo-hindcast studies. These conditions are necessary for the conduction of three to four model simulations. The boundary conditions have been prepared for future runs. The second topic is (a) comparing the atmospheric general circulation model (GCM) with observations and other GCMs; and (b) development of a better precipitation data base for the Yucca Mtn. region for comparisons with models. These tasks have been completed. The third topic is preliminary assessments of future climate change. Energy balance model (EBM) simulations suggest that the greenhouse effect will likely dominate climate change at Yucca Mtn. for the next 10,000 years. The EBM study should improve rational choice of GCM CO{sub 2} scenarios for future climate change.

Crowley, T.J.; Smith, N.R. [Applied Research Corp., College Station, TX (United States)

1994-05-01T23:59:59.000Z

194

Modeling the Global Structure of the Heliosphere during the Recent Solar Minimum  

E-Print Network [OSTI]

, Berkeley, California. Abstract. The recent solar minimum, marking the end of solar cycle 23, has beenModeling the Global Structure of the Heliosphere during the Recent Solar Minimum: Model Mikic and Janet G. Luhmann Predictive Science, San Diego, California. Harvard-Smithsonian Center

California at Berkeley, University of

195

Change in regime and transfer function models of global solar radiation in Kuwait  

Science Journals Connector (OSTI)

The development of the models for global solar radiation in Kuwait is based on removing the annual periodicity and seasonal variation. The first methodology used here is the change in regime technique that relies on dividing the observations into two ... Keywords: ARMA model, Harmonic analysis, Solar radiation, Transfer function

S. A. Al-Awadhi

2005-09-01T23:59:59.000Z

196

ECONOMIC MODELING OF THE GLOBAL ADOPTION OF CARBON CAPTURE AND SEQUESTRATION TECHNOLOGIES  

E-Print Network [OSTI]

ECONOMIC MODELING OF THE GLOBAL ADOPTION OF CARBON CAPTURE AND SEQUESTRATION TECHNOLOGIES J. R. Mc of carbon capture and sequestration technologies as applied to electric generating plants. The MIT Emissions, is used to model carbon capture and sequestration (CCS) technologies based on a natural gas combined cycle

197

Global empirical wind model for the upper mesosphere/lower thermosphere. I. Prevailing wind  

E-Print Network [OSTI]

Global empirical wind model for the upper mesosphere/lower thermosphere. I. Prevailing wind Y. I. An updated empirical climatic zonally aver- aged prevailing wind model for the upper mesosphere/ lower of monthly mean winds from meteor radar and MF radar measurements at more than 40 stations, well distributed

Paris-Sud XI, Université de

198

Global and multi-scale features of solar wind-magnetosphere coupling: From modeling to forecasting  

E-Print Network [OSTI]

and substorms; 2784 Magnetospheric Physics: Solar wind/magnetosphere interactions; 3210 Mathematical Geophysics in the solar wind-magnetosphere interaction, de- veloping first principles models that encompass allGlobal and multi-scale features of solar wind-magnetosphere coupling: From modeling to forecasting

Sitnov, Mikhail I.

199

Sensitivity of sea ice to physical parameterizations in the GISS global climate model  

E-Print Network [OSTI]

absorbed by the polar regions. Second, sea ice has a strong insulating effect on the under- lying oceanSensitivity of sea ice to physical parameterizations in the GISS global climate model Jiping Liu,1 coupled model is used to investigate the sensitivity of sea ice to each of the following parameterizations

200

Parameterization of urban sub-grid scale processes in global atmospheric chemistry models  

E-Print Network [OSTI]

-scale models. (submitted to Journal of Geophysical Research) #12;2 1. Introduction Atmospheric pollution has1 Parameterization of urban sub-grid scale processes in global atmospheric chemistry models Josep such as meteorology. Effective emissions may be Ã?agedÃ? emissions of primary pollutants or actual production

Note: This page contains sample records for the topic "global system modeling" 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

Dual Models with Global SU(2,2) Symmetry  

Science Journals Connector (OSTI)

The possibility of enlarging the gauge symmetry of the dual resonance models is considered by studying the structure of SU(2,2)- [or SO(4,2)] invariant dual models. n-point functions based on the degenerate representations of SU(2,2) are worked out in detail, and a condition under which these amplitudes are dual is specified. Dual models based on the nondegenerate representations are also discussed. Through a physical interpretation of the characteristics which emerge, a possible connection between the dimension N-1 of the hadronic matter and the gauge-symmetry group SO(N, 2) is pointed out.

Freydoon Mansouri

1973-08-15T23:59:59.000Z

202

The global financial markets: an ultra-large-scale systems perspective  

Science Journals Connector (OSTI)

We argue here that, in recent years, the world's financial markets have become a globally interconnected complex adaptive ultra-large-scale socio-technical system-of-systems, and that this has important consequences for how the financial markets should ... Keywords: algorithmic trading, financial markets, flash crash, high-frequency trading, large-scale complex IT systems, normalization of deviance, ultra-large-scale systems

Dave Cliff; Linda Northrop

2012-03-01T23:59:59.000Z

203

GLOBAL OPTIMIZATION OF MULTIPHASE FLOW NETWORKS IN OIL AND GAS PRODUCTION SYSTEMS  

E-Print Network [OSTI]

1 GLOBAL OPTIMIZATION OF MULTIPHASE FLOW NETWORKS IN OIL AND GAS PRODUCTION SYSTEMS MSc. Hans in an oil production system is developed. Each well may be manipulated by injecting lift gas and adjusting in the maximum oil flow rate, water flow rate, liquid flow rate, and gas flow rate. The wells may also

Johansen, Tor Arne

204

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

205

Design and global optimization of high-efficiency thermophotovoltaic systems  

E-Print Network [OSTI]

Despite their great promise, small experimental thermophotovoltaic (TPV) systems at 1000 K generally exhibit extremely low power conversion efficiencies (approximately 1%), due to heat losses such as thermal emission of ...

Bermel, Peter A.

206

ISO 50001: A Global Energy Management System Standard  

E-Print Network [OSTI]

ISO 50001:2011 provides benefits for any organization to establish a framework to manage and improve energy consumption. The framework of ISO 50001:2011 enables organizations to establish the systems and processes necessary to improve energy...

Chowdhury, N.

2013-01-01T23:59:59.000Z

207

Accelerating the Global Transformation to 21st Century Power Systems  

Science Journals Connector (OSTI)

Nations and regions need to share lessons about the best ways to create enabling policies, regulations, and markets that get the most social benefit out of power systems and incent the necessary investments.

Morgan Bazilian; Mackay Miller; Reid Detchon; Michael Liebreich; William Blyth; Matthew Futch; Vijay Modi; Lawrence Jones; Brent Barkett; Mark Howells; Iain MacGill; Daniel M. Kammen; Trieu Mai; Matthew Wittenstein; Sonia Aggarwal; Mark O’Malley; Juan Pablo Carvallo; Manuel Welsch; Graham Pugh; Rick Weston; Douglas J. Arent

2013-01-01T23:59:59.000Z

208

Transformer modeling in power systems  

SciTech Connect (OSTI)

A practical and accurate method of modeling various transformers in power systems using a general circuit model approach is described in this paper. The advantage of the new approach is that it can model transformers along with a complex circuit network, while avoiding the use of symmetrical components, unlike other approaches. The transformer modeling technique introduced in this paper is very useful to accurately determine fault current distribution in a power system and electromagnetic interference on pipelines and communication lines installed in a right-of-way consisting of transmission lines operating at different voltages.

Ma, J.; Dawalibi, F.P. [Safe Engineering Services and Technologies Ltd., Montreal, Quebec (Canada)

1999-11-01T23:59:59.000Z

209

Earth System Modeling (ESM) Program | U.S. DOE Office of Science (SC)  

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

Earth System Modeling (ESM) Earth System Modeling (ESM) Program Biological and Environmental Research (BER) BER Home About Research Research Abstracts Searchable Archive of BER Highlights External link Biological Systems Science Division (BSSD) Climate and Environmental Sciences Division (CESD) ARM Climate Research Facility Atmospheric System Research (ASR) Program Data Management Earth System Modeling (ESM) Program William R. Wiley Environmental Molecular Sciences Laboratory (EMSL) Integrated Assessment of Global Climate Change Regional & Global Climate Modeling (RGCM) Program Subsurface Biogeochemical Research Terrestrial Carbon Sequestration External link Terrestrial Ecosystem Science Facilities Science Highlights Benefits of BER Funding Opportunities Biological & Environmental Research Advisory Committee (BERAC)

210

Advanced Materials for Energy Systems | Global and Regional Solutions  

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

Advanced Materials for Energy Systems Advanced Materials for Energy Systems The Advanced Materials Group's mission is to conduct research on materials in extreme environments for advanced energy systems. As part of that mission, the group utilizes synchrotron characterization techniques such as diffraction, spectroscopy, and imaging and is developing sample chambers for the in situ study of materials at the National Synchrotron Light Source (NSLS). The 200 MeV proton beam of the BNL Linac and the target facility of the Brookhaven Linear Isotope Producer (BLIP) is being extensively used for irradiation damage studies on materials for fast !ssion and fusion reactors as well as high particle accelerator elements such as pion production targets for neutrino experiments. The irradiation facility is augmented with post-irradiation hot labs where analysis and

211

4, 40694124, 2007 Global-scale  

E-Print Network [OSTI]

into evapotranspiration and total runoff. We estimate that global groundwater recharge was 12 666 km3 /yr for the climateHESSD 4, 4069­4124, 2007 Global-scale modeling of groundwater recharge P. D¨oll and K. Fiedler System Sciences Global-scale modeling of groundwater recharge P. D¨oll and K. Fiedler Institute

Boyer, Edmond

212

A Global Steering Method for Driftless Control-Affine Systems  

E-Print Network [OSTI]

in chained-form unless each trailer is hinged to the midpoint of the previous wheel axle, an unusual in this category, the so-called plate-ball system, does not allow any chained-form transformation and is not flat

213

Predicting mesh density for adaptive modelling of the global atmosphere  

Science Journals Connector (OSTI)

...under investigation for atmospheric modelling for some time...atmosphere, using the shallow water equations-a necessary...to solve the shallow water equations on fixed meshes...discussed in 3. The mesh generator and the predictive adaptive...Solving the shallow water equations on polygons...

2009-01-01T23:59:59.000Z

214

Increasing NOAA's computational capacity to improve global forecast modeling  

E-Print Network [OSTI]

competing numerical weather prediction centers such as the European Center for MediumRange Weather Forecasts (ECMWF). For most sensibleweather metrics, we lag 1 to 1.5 days (i.e., they make a 3.5day of NOAA's current investment in weather satellites. Without a modern data assimilation system

Hamill, Tom

215

Long-Range Atmospheric Transport of Polycyclic Aromatic Hydrocarbons: A Global 3-D Model Analysis Including Evaluation of Arctic Sources  

E-Print Network [OSTI]

We use the global 3-D chemical transport model GEOS-Chem to simulate long-range atmospheric transport of polycyclic aromatic hydrocarbons (PAHs). To evaluate the model’s ability to simulate PAHs with different volatilities, ...

Friedman, Carey

216

Physical system modeling with Modelica  

Science Journals Connector (OSTI)

A new language, called ModelicaTM, for the modeling of physical systems has been developed in an international effort. The main objective was to make it easy to exchange models and model libraries. The design approach builds on non-causal modeling with true ordinary differential and algebraic equations and the use of object-oriented constructs to facilitate the reuse of modeling knowledge. There are already several modeling languages based on these ideas, available from universities and small companies. There is also significant experience of using them in various applications. The aim of the Modelica effort was to unify the concepts and to design a new uniform language for model representation. The paper describes the effort, gives an overview of Modelica, and demonstrates how Modelica is used in real-world applications: modeling of an automatic gearbox and of a heat exchanger.

Sven Erik Mattsson; Hilding Elmqvist; Martin Otter

1998-01-01T23:59:59.000Z

217

Leveraging The Open Provenance Model as a Multi-Tier Model for Global Climate Research  

SciTech Connect (OSTI)

Global climate researchers rely upon many forms of sensor data and analytical methods to help profile subtle changes in climate conditions. The U.S. Department of Energy's Atmospheric Radiation Measurement (ARM) program provides researchers with curated Value Added Products (VAPs) resulting from continuous sensor data streams, data fusion, and modeling. The ARM operations staff and software development teams (data producers) rely upon a number of techniques to ensure strict quality control (QC) and quality assurance (QA) standards are maintained. Climate researchers (data consumers) are highly interested in obtaining as much provenance (data quality, data pedigree) as possible to establish data trustworthiness. Currently all the provenance is not easily attainable or identifiable without significant efforts to extract and piece together information from configuration files, log files, codes, and status information from ARM databases. The need for a formalized approach to managing provenance became paramount with the planned addition of 120 new instruments, new data products, and data collection scaling to half a terabyte daily. Last year our research identified the need for a multi-tier provenance model to enable the data consumer easy access to the provenance for their data. This year we are leveraging the Open Provenance Model as a foundational construct that serves the needs of both the VAP producers and consumers, we are organizing the provenance in different tiers of granularity to model VAP lineage, causality at the component level within a VAP, and the causality for each time step as samples are being assembled within the VAP. This paper shares our implementation strategy and how the ARM operations staff and the climate research community can greatly benefit from this approach to more effectively assess and quantify VAP provenance.

Stephan, Eric G.; Halter, Todd D.; Ermold, Brian D.

2010-12-08T23:59:59.000Z

218

Looking at Earth as a System Chapter 11 UnderstandingGlobalClimateChange 2  

E-Print Network [OSTI]

Looking at Earth as a System Chapter 11 #12;UnderstandingGlobalClimateChange 2 A Systems Approach to Look at Earth 1.1 AdifferentwayofunderstandingEarth Notes1.1.1 If we are going to look at Earth and the house would end up either being too hot or too cold. #12;Looking at Earth as a System Chapter 13 Notes1

Howat, Ian M.

219

The AeroCom Evaluation and Intercomparison of Organic Aerosol in Global Models  

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

This paper evaluates the current status of global modeling of the organic aerosol (OA) occurrence in the troposphere and analyzes the differences calculated between models as well as between models and observations. Thirty-one global chemistry/transport and general circulation models have participated in this intercomparison, in the framework of AeroCom phase II. The simulation of OA varies greatly between models in terms of the magnitude of primary emissions, secondary OA (SOA) formation, the number of OA species used (2 to 62), the complexity of OA parameterizations (gas-particle partitioning, chemical aging, multiphase chemistry, aerosol microphysics), and the OA physical, chemical and optical properties. The diversity of the global OA simulation results has increased since earlier AeroCom experiments, mainly due to the increasing complexity of the SOA parameterization in models, and the implementation of new, highly uncertain, OA sources. Diversity of over an order of magnitude exists in the modeled vertical distribution of OA that deserves a dedicated future study. Furthermore, although the OA/OC ratio depends on OA sources and atmospheric processing and is important for model evaluation against OA and OC observations, it is resolved only by few global models. The median global primary OA source strength is 56 Tg a 1 (range 34 - 144 Tg a-1) and the median secondary OA source strength (natural and anthropogenic) is 19 Tg a-1 (range 13-121 Tg a-1). Among the models that take into account the semi-volatile SOA nature, the median source is calculated to be 51 Tg a-1 (range 16-121 Tg a-1), much larger than the median value of the models that calculate SOA in a more simplistic way (19 Tg a-1; range 13-20 Tg a-1, with one model at 37 Tg a-1). The median atmospheric burden of OA is 1.4 Tg (24 models in the range of 0.6-2.0 Tg and 4 between 2.4-3.8 Tg) with a median OA lifetime of 5.4 days (range 3.8-9.6 days). In models that reported both OA and sulfate burdens, the median value of the OA/sulfate burden ratio of is calculated to be 0.77; 13 models calculate a ratio lower than 1, and 9 models higher than 1. For 26 models that reported OA deposition fluxes, the median wet removal is 70 Tg a-1 (range 28-209 Tg a-1), which is on average 85% of the total OA deposition.

Tsigaridis, Kostas; Daskalakis, N.; Kanakidou, M.; Adams, P. J.; Artaxo, Paulo; Bahadur, R.; Balkanski, Y.; Bauer, S.; Bellouin, N.; Benedetti, Angela; Bergman, T.; Berntsen, T.; Beukes, J. P.; Bian, Huisheng; Carslaw, K. S.; Chin, M.; Curci, Gabriele; Diehl, Thomas; Easter, Richard C.; Ghan, Steven J.; Gong, S.; Hodzic, Alma; Hoyle, Christopher R.; Iversen, T.; Jathar, S.; Jimenez, J. L.; Kaiser, J. W.; Kirkevag, A.; Koch, Dorothy; Kokkola, H.; Lee, Y. H.; Lin, G.; Liu, Xiaohong; Luo, Gan; Ma, Xiaoyan; Mann, G. W.; Mihalopoulos, Nikos; Morcrette, J. -J.; Muller, J. F.; Myhre, G.; Myriokefalitakis, S.; Ng, Nga L.; O'Donell, D.; Penner, J. E.; Pozzoli, L.; Pringle, K. J.; Russell, Lynn; Schulz, M.; Sciare, J.; Seland, O.; Shindell, Drew; Sillman, S.; Skeie, R. B.; Spracklen, D. V.; Stavrakou, T.; Steenrod, Stephen D.; Takemura, T.; Tiitta, P.; Tilmes, S.; Tost, H.; van Noije, T.; van Zyl, P. G.; von Salzen, Knut; Yu, Fangqun; Wang, Zaizi; Wang, Zhilli; Zaveri, Rahul A.; Zhang, Hua; Zhang, Kai; Zhang, Qi; Zhang, Xiaoye

2014-10-15T23:59:59.000Z

220

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

Note: This page contains sample records for the topic "global system modeling" 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

Voronoi Tessellations and Their Application to Climate and Global Modeling  

SciTech Connect (OSTI)

We review the use of Voronoi tessellations for grid generation, especially on the whole sphere or in regions on the sphere. Voronoi tessellations and the corresponding Delaunay tessellations in regions and surfaces on Euclidean space are defined and properties they possess that make them well-suited for grid generation purposes are discussed, as are algorithms for their construction. This is followed by a more detailed look at one very special type of Voronoi tessellation, the centroidal Voronoi tessellation (CVT). After defining them, discussing some of their properties, and presenting algorithms for their construction, we illustrate the use of CVTs for producing both quasi-uniform and variable resolution meshes in the plane and on the sphere. Finally, we briefly discuss the computational solution of model equations based on CVTs on the sphere.

Ju, Lili [University of South Carolina; Ringler, Todd [Los Alamos National Laboratory; Gunzburger, Max [Florida State University

2011-01-01T23:59:59.000Z

222

NASA/TM-2012-104606/Vol 30 Technical Report Series on Global Modeling and  

E-Print Network [OSTI]

NASA/TM-2012-104606/Vol 30 Technical Report Series on Global Modeling 20771 December 2012 #12;Since its founding, NASA has been dedicated to the advancement of aeronautics and space science. The NASA scientific and technical information (STI) pro- gram plays a key part

223

Global climate change model natural climate variation: Paleoclimate data base, probabilities and astronomic predictors  

SciTech Connect (OSTI)

This report was prepared at the Lamont-Doherty Geological Observatory of Columbia University at Palisades, New York, under subcontract to Pacific Northwest Laboratory it is a part of a larger project of global climate studies which supports site characterization work required for the selection of a potential high-level nuclear waste repository and forms part of the Performance Assessment Scientific Support (PASS) Program at PNL. The work under the PASS Program is currently focusing on the proposed site at Yucca Mountain, Nevada, and is under the overall direction of the Yucca Mountain Project Office US Department of Energy, Las Vegas, Nevada. The final results of the PNL project will provide input to global atmospheric models designed to test specific climate scenarios which will be used in the site specific modeling work of others. The primary purpose of the data bases compiled and of the astronomic predictive models is to aid in the estimation of the probabilities of future climate states. The results will be used by two other teams working on the global climate study under contract to PNL. They are located at and the University of Maine in Orono, Maine, and the Applied Research Corporation in College Station, Texas. This report presents the results of the third year`s work on the global climate change models and the data bases describing past climates.

Kukla, G.; Gavin, J. [Columbia Univ., Palisades, NY (United States). Lamont-Doherty Geological Observatory

1994-05-01T23:59:59.000Z

224

Global Memory Access Modelling for Efficient Implementation of the Lattice Boltzmann  

E-Print Network [OSTI]

Global Memory Access Modelling for Efficient Implementation of the Lattice Boltzmann Method, lattice Boltzmann method, CFD Introduction State-of-the-art graphics processing units (GPU) have proven performance. 2 Lattice Boltzmann Method The Lattice Boltzmann Method is a rather innovative approach

Boyer, Edmond

225

Optimized regional and interannual variability of lightning in a global chemical transport model constrained  

E-Print Network [OSTI]

to remove their diurnal sampling bias, we construct a monthly time series of lightning flash rates for 1998, D20307, doi:10.1029/2012JD017934. 1. Introduction [2] The extreme heat in a lightning flash channelOptimized regional and interannual variability of lightning in a global chemical transport model

Jacob, Daniel J.

226

Global dynamics of a vector disease model with saturation incidence and time delay  

Science Journals Connector (OSTI)

......Journal of Applied Mathematics (2011) 76, 919-937 doi:10.1093/imamat/hxr013 Advance Access publication on March 17, 2011 Global dynamics of a vector disease model with saturation incidence and time delay RUI XU Institute of Applied Mathematics......

Rui Xu; Zhien Ma

2011-12-01T23:59:59.000Z

227

Response of the Northern Hemisphere sea ice to greenhouse forcing in a global climate model  

E-Print Network [OSTI]

in summer, in part because of the reductions in ice cover and thickness that insulate the winter atmosphereResponse of the Northern Hemisphere sea ice to greenhouse forcing in a global climate model Larissa warming of about 4³C for doubled CO2. Enhanced warming is found at higher latitudes near sea-ice margins

228

A COMPARISON BETWEEN GLOBAL SOLAR MAGNETOHYDRODYNAMIC AND POTENTIAL FIELD SOURCE SURFACE MODEL RESULTS  

E-Print Network [OSTI]

ABSTRACT The large-scale, steady-state magnetic field configuration of the solar corona is typicallyA COMPARISON BETWEEN GLOBAL SOLAR MAGNETOHYDRODYNAMIC AND POTENTIAL FIELD SOURCE SURFACE MODEL computer resources, and can resolve structure on scales beyond those that can be handled by current MHD

California at Berkeley, University of

229

Modeling the Dynamics of Desakota Regions: Global - Local Nexus in the Taipei Metropolitan Area  

E-Print Network [OSTI]

develops a GIS-based CA framework based on the desakota model to not only simulate the unique urbanization processes in Asia but also integrate the influence of globalization into Asian urban dynamics. Three approaches are developed in the CA simulation: 1...

Wu, Bing-Sheng

2010-10-12T23:59:59.000Z

230

A global fit study on the new agegraphic dark energy model  

Science Journals Connector (OSTI)

We perform a global fit study on the new agegraphic dark energy (NADE) model in a non-flat ... , BAO data from SDSS DR7 and WiggleZ Dark Energy Survey, and the latest measurements of H 0 from HST....

Jing-Fei Zhang; Yun-He Li; Xin Zhang

2013-01-01T23:59:59.000Z

231

Changes in Temperature and Precipitation Extremes in the IPCC Ensemble of Global Coupled Model Simulations  

E-Print Network [OSTI]

Changes in Temperature and Precipitation Extremes in the IPCC Ensemble of Global Coupled Model September 2006) ABSTRACT Temperature and precipitation extremes and their potential future changes on Climate Change (IPCC) diagnostic exercise for the Fourth Assessment Report (AR4). Climate extremes

232

Global Thermodynamic Atmospheric Modeling: Search for NewHeterogeneous Reactions  

SciTech Connect (OSTI)

This article demonstrates quantitatively how far reactions are from chemical equilibrium over the full space of a two-dimensional atmospheric model. This method could be used with data where an instrument-equipped aircraft measures numerous species simultaneously, An atmospheric reaction is displaced from equilibrium by solar radiation and relocation of species by atmospheric motions. One purpose of this study is to seek additional stratospheric or tropospheric gas-phase chemical reactions that might undergo heterogeneous catalysis. Hypothetical cases can be rapidly screened in terms of their thermodynamic potential to react under measured or modeled atmospheric conditions of temperature and local species concentrations. If a reaction is interesting, is slow in the gas phase, and has a high thermodynamic tendency to react, it is a good candidate for a laboratory study to seek a heterogeneous catalyst, if the reaction is thermodynamically unfavorable, there is no catalyst that can cause the reaction to occur. If a reaction is thermodynamically favored to occur but also endothermic, it will tend to be slow at stratospheric temperatures. We find, as expected, that four heterogeneous reactions important in causing the Antarctic ''ozone hole'' have high thermodynamic tendencies to occur under atmospheric conditions, but one of these is only weakly thermodynamically allowed in some regions of the atmosphere. The reaction of SO2 and HNO3 to form HONO has a high thermodynamic potential to occur, is a well-known laboratory reaction at ice temperature, and may occur in nitric acid-rich sulfate aerosols. Throughout the troposphere and stratosphere, we find that formaldehyde has an extremely high thermodynamic potential to reduce nitric acid. Formaldehyde is known to stick to and remain in sulfuric acid solution, where it adds water to form H2C(OH)(2). Near room-temperature H2C(OH)(2) reacts with nitric acid in a two-step mechanism to form two molecules of HONO, but the rate of this process under conditions of stratospheric sulfuric acid aerosols is unknown.

Fairbrother, D.H.; Sullivan, D.S.D.; Johnston, H.S.

1997-07-03T23:59:59.000Z

233

Global well-posedness for the fractional Schrödinger–Boussinesq system  

Science Journals Connector (OSTI)

Abstract In this paper, we study the fractional Schrödinger–Boussinesq system raised in the laser and plasma physics, where the nonlinear term f ( n ) can be chosen as a large kind of functions. We obtain that it is global well-posed in H s ( R ) in one dimensional space, when s ? 1 .

Lijia Han; Jingjun Zhang; Boling Guo

2014-01-01T23:59:59.000Z

234

Global Sensitivity Analysis: a tool to analyse LCA variability of energy systems  

E-Print Network [OSTI]

Global Sensitivity Analysis: a tool to analyse LCA variability of energy systems Pierryves Padey1 been widely assessed over the past decades, in particular with the LCA approach. Several literature makers to consider LCA as an inconclusive method [2]. Improving the understanding of the LCA results

Paris-Sud XI, Université de

235

Detecting Global Predicates in Distributed Systems with Clocks Scott D. Stoller  

E-Print Network [OSTI]

detection modalities, i.e., 3 meanings of \\predicate held during a computation", namely: PossdbDetecting Global Predicates in Distributed Systems with Clocks Scott D. Stoller Computer Science"). This paper de nes these modalities and gives e cient algorithms for detecting them. The algorithms are based

Stoller, Scott

236

Design and global optimization of high-efficiency solar thermal systems  

E-Print Network [OSTI]

, Massachusetts 02139, USA bermel@mit.edu Abstract: Solar thermal, thermoelectric, and thermophotovoltaic (TPVDesign and global optimization of high-efficiency solar thermal systems with tungsten cermets DavidDepartment of Physics, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts

Soljaèiæ, Marin

237

Assessing the effects of anthropogenic aerosols on Pacific storm track using a multiscale global climate model  

Science Journals Connector (OSTI)

...Sciences Enhancing the Capability of Computational Earth System Models and Using NASA Data for Operation and Assessment...Science, Decadal and Regional Climate Prediction using Earth System Models program (M.W. and S.J.G.). PNNL is operated...

Yuan Wang; Minghuai Wang; Renyi Zhang; Steven J. Ghan; Yun Lin; Jiaxi Hu; Bowen Pan; Misti Levy; Jonathan H. Jiang; Mario J. Molina

2014-01-01T23:59:59.000Z

238

Key dimensions of global supply strategy: a model of interrelated decisions  

Science Journals Connector (OSTI)

In the past few decades, driven by strong competition and globalisation in world markets, companies have turned to supply management internationalisation strategies in order to effectively support their globalisation processes, both in terms of centralised purchasing and globalisation supply. Indeed, literature indicates that multinational companies (MNCs) seeking to build effective and efficient global supply strategies (GSS) need to develop and implement adequate headquarters' follow-up systems and buyer-supplier relationships for global supply management performance in order to ensure world supply consistency and alignment. This paper shows how companies' globalisation evolution and global supply strategy behaviour patterns (as to supply source globalisation and centralised purchasing) constitute major driving factors for headquarters-subsidiary relationships and supplier management strategies.

Julio Sanchez Loppacher; Raffaella Cagliano; Gianluca Spina

2011-01-01T23:59:59.000Z

239

The Causes of Trade Globalization: A Political-Economy and World-Systems Approach  

E-Print Network [OSTI]

effect of energy consumption on trade globalization; but notvariables include: trade globalization, energy consumption,Democracy Constant Energy Consumption ? Trade Globalization

Kwon, Roy

2011-01-01T23:59:59.000Z

240

Impacts of increased bioenergy demand on global food markets: an AgMIP economic model intercomparison  

SciTech Connect (OSTI)

Integrated Assessment studies have shown that meeting ambitious greenhouse gas mitigation targets will require substantial amounts of bioenergy as part of the future energy mix. In the course of the Agricultural Model Comparison and Improvement Project (AgMIP), five global agro-economic models were used to analyze a future scenario with global demand for ligno-cellulosic bioenergy rising to about 100 ExaJoule in 2050. From this exercise a tentative conclusion can be drawn that ambitious climate change mitigation need not drive up global food prices much, if the extra land required for bioenergy production is accessible or if the feedstock, e.g. from forests, does not directly compete for agricultural land. Agricultural price effects across models by the year 2050 from high bioenergy demand in an RCP2.6-type scenario appear to be much smaller (+5% average across models) than from direct climate impacts on crop yields in an RCP8.5-type scenario (+25% average across models). However, potential future scarcities of water and nutrients, policy-induced restrictions on agricultural land expansion, as well as potential welfare losses have not been specifically looked at in this exercise.

Lotze-Campen, Hermann; von Lampe, Martin; Kyle, G. Page; Fujimori, Shinichiro; Havlik, Petr; van Meijl, Hans; Hasegawa, Tomoko; Popp, Alexander; Schmitz, Christoph; Tabeau, Andrzej; Valin, Hugo; Willenbockel, Dirk; Wise, Marshall A.

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "global system modeling" 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

Intercomparison and evaluation of global aerosol microphysical properties among AeroCom models of a range of complexity  

E-Print Network [OSTI]

Many of the next generation of global climate models will include aerosol schemes which explicitly simulate the microphysical processes that determine the particle size distribution. These models enable aerosol optical ...

Ridley, David Andrew

242

Impact of emissions, chemistry, and climate on atmospheric carbon monoxide : 100-year predictions from a global chemistry-climate model  

E-Print Network [OSTI]

The possible trends for atmospheric carbon monoxide in the next 100 yr have been illustrated using a coupled atmospheric chemistry and climate model driven by emissions predicted by a global economic development model. ...

Wang, Chien.; Prinn, Ronald G.

243

Author's personal copy Two-way coupling of an ENSO model to the global climate model CLIMBER-3a  

E-Print Network [OSTI]

it is possible to introduce ENSO variability to an Earth system Model of Intermediate Complexity (EMIC we are using here. In this study we couple the Earth system model of intermediate complexity (EMIC

Levermann, Anders

244

Why Do Global Long-term Scenarios for Agriculture Differ? An overview of the AgMIP Global Economic Model Intercomparison  

SciTech Connect (OSTI)

Recent studies assessing plausible futures for agricultural markets and global food security have had contradictory outcomes. Ten global economic models that produce long-term scenarios were asked to compare a reference scenario with alternate socio-economic, climate change and bioenergy scenarios using a common set of key drivers. Results suggest that, once general assumptions are harmonized, the variability in general trends across models declines, and that several common conclusions are possible. Nonetheless, differences in basic model parameters, sometimes hidden in the way market behavior is modeled, result in significant differences in the details. This holds for both the common reference scenario and for the various shocks applied. We conclude that agro-economic modelers aiming to inform the agricultural and development policy debate require better data and analysis on both economic behavior and biophysical drivers. More interdisciplinary modeling efforts are required to cross-fertilize analyses at different scales.

von Lampe, Martin; Willenbockel, Dirk; Ahammad, Helal; Blanc, Elodie; Cai, Yongxia; Calvin, Katherine V.; Fujimori, Shinichiro; Hasegawa, Tomoko; Havlik, Petr; Kyle, G. Page; Lotze-Campen, Hermann; Mason d'Croz, Daniel; Nelson, Gerald; Sands, Ronald; Schmitz, Christoph; Tabeau, Andrzej; Valin, Hugo; van der Mensbrugghe, Dominique; van Meijl, Hans

2014-01-01T23:59:59.000Z

245

Is the Ozone Depletion Regime a Model for an Emerging Regime on Global Warming?  

E-Print Network [OSTI]

the for- mation of a global warming regime produces a highlydepletion and the global warming regimes was recognized byan Emerging Regime on Global Warming? by Winfried Lang I.

Lang, Winfried

1991-01-01T23:59:59.000Z

246

Assessing the Effects of Anthropogenic Aerosols on Pacific Storm Track Using a Multiscale Global Climate Model  

SciTech Connect (OSTI)

Atmospheric aerosols impact weather and global general circulation by modifying cloud and precipitation processes, but the magnitude of cloud adjustment by aerosols remains poorly quantified and represents the largest uncertainty in estimated forcing of climate change. Here we assess the impacts of anthropogenic aerosols on the Pacific storm track using a multi-scale global aerosol-climate model (GCM). Simulations of two aerosol scenarios corresponding to the present day and pre-industrial conditions reveal long-range transport of anthropogenic aerosols across the north Pacific and large resulting changes in the aerosol optical depth, cloud droplet number concentration, and cloud and ice water paths. Shortwave and longwave cloud radiative forcing at the top of atmosphere are changed by - 2.5 and + 1.3 W m-2, respectively, by emission changes from pre-industrial to present day, and an increased cloud-top height indicates invigorated mid-latitude cyclones. The overall increased precipitation and poleward heat transport reflect intensification of the Pacific storm track by anthropogenic aerosols. Hence, this work provides for the first time a global perspective of the impacts of Asian pollution outflows from GCMs. Furthermore, our results suggest that the multi-scale modeling framework is essential in producing the aerosol invigoration effect of deep convective clouds on the global scale.

Wang, Yuan; Wang, Minghuai; Zhang, Renyi; Ghan, Steven J.; Lin, Yun; Hu, Jiaxi; Pan, Bowen; Levy, Misti; Jiang, Jonathan; Molina, Mario J.

2014-05-13T23:59:59.000Z

247

Assessing the consistency between short-term global temperature trends in observations and climate model projections  

E-Print Network [OSTI]

Assessing the consistency between short-term global temperature trends in observations and climate model projections is a challenging problem. While climate models capture many processes governing short-term climate fluctuations, they are not expected to simulate the specific timing of these somewhat random phenomena - the occurrence of which may impact the realized trend. Therefore, to assess model performance, we develop distributions of projected temperature trends from a collection of climate models running the IPCC A1B emissions scenario. We evaluate where observed trends of length 5 to 15 years fall within the distribution of model trends of the same length. We find that current trends lie near the lower limits of the model distributions, with cumulative probability-of-occurrence values typically between 5 percent and 20 percent, and probabilities below 5 percent not uncommon. Our results indicate cause for concern regarding the consistency between climate model projections and observed climate behavior...

Michaels, Patrick J; Christy, John R; Herman, Chad S; Liljegren, Lucia M; Annan, James D

2013-01-01T23:59:59.000Z

248

Models for multimegawatt space power systems  

SciTech Connect (OSTI)

This report describes models for multimegawatt, space power systems which Sandia's Advanced Power Systems Division has constructed to help evaluate space power systems for SDI's Space Power Office. Five system models and models for associated components are presented for both open (power system waste products are exhausted into space) and closed (no waste products) systems: open, burst mode, hydrogen cooled nuclear reactor -- turboalternator system; open, hydrogen-oxygen combustion turboalternator system; closed, nuclear reactor powered Brayton cycle system; closed, liquid metal Rankine cycle system; and closed, in-core, reactor therminonic system. The models estimate performance and mass for the components in each of these systems. 17 refs., 8 figs., 15 tabs.

Edenburn, M.W.

1990-06-01T23:59:59.000Z

249

Impact of mesophyll diffusion on estimated global land CO2 fertilization  

E-Print Network [OSTI]

by Earth system models. Without this correction, the CFE for global GPP is underestimated by 0.05 Pg

Hoffman, Forrest M.

250

MODIS Collection 5 global land cover: Algorithm refinements and characterization of new datasets  

E-Print Network [OSTI]

information is required to parameterize land surface processes in regional-to-global scale Earth system models

Wisconsin at Madison, University of

251

Canonical Duality-Triality Theory: Bridge Between Nonconvex Analysis/Mechanics and Global Optimization in Complex Systems  

E-Print Network [OSTI]

Canonical duality-triality is a breakthrough methodological theory, which can be used not only for modeling complex systems within a unified framework, but also for solving a wide class of challenging problems from real-world applications. This paper presents a brief review on this theory, its philosophical origin, physics foundation, and mathematical statements in both finite and infinite dimensional spaces, with emphasizing on its role for bridging the gap between nonconvex analysis/mechanics and global optimization. Special attentions are paid on unified understanding the fundamental difficulties in large deformation mechanics, bifurcation/chaos in nonlinear science, and the NP-hard problems in global optimization, as well as the theorems, methods, and algorithms for solving these challenging problems. Misunderstandings and confusions on some basic concepts, such as objectivity, nonlinearity, Lagrangian, and generalized convexities are discussed and classified. Breakthrough from recent challenges and conceptual mistakes by M. Voisei, C. Z\\u{a}linescu and his co-worker are addressed. Some open problems and future works in global optimization and nonconvex mechanics are proposed.

David Y Gao; Ning Ruan; Vittorio Latorre

2014-10-10T23:59:59.000Z

252

Canonical Duality-Triality Theory: Bridge Between Nonconvex Analysis/Mechanics and Global Optimization in Complex Systems  

E-Print Network [OSTI]

Canonical duality-triality is a breakthrough methodological theory, which can be used not only for modeling complex systems within a unified framework, but also for solving a wide class of challenging problems from real-world applications. This paper presents a brief review on this theory, its philosophical origin, physics foundation, and mathematical statements in both finite and infinite dimensional spaces, with emphasizing on its role for bridging the gap between nonconvex analysis/mechanics and global optimization. Special attentions are paid on unified understanding the fundamental difficulties in large deformation mechanics, bifurcation/chaos in nonlinear science, and the NP-hard problems in global optimization, as well as the theorems, methods, and algorithms for solving these challenging problems. Misunderstandings and confusions on some basic concepts, such as objectivity, nonlinearity, Lagrangian, and generalized convexities are discussed and classified. Breakthrough from recent challenges and conceptual mistakes by M. Voisei, C. Zalinescu and his co-worker are addressed. Some open problems and future works in global optimization and nonconvex mechanics are proposed.

David Y Gao; Ning Ruan; Vittorio Latorre

2014-11-26T23:59:59.000Z

253

Finite Element Analysis of the Amontons-Coulomb's Model using Local and Global Friction Tests  

SciTech Connect (OSTI)

In spite of the abundant number of experimental friction tests that have been reported, the contact with friction modeling persists to be one of the factors that determine the effectiveness of sheet metal forming simulation. This difficulty can be understood due to the nature of the friction phenomena, which comprises the interaction of different factors connected to both sheet and tools' surfaces. Although in finite element numerical simulations friction models are commonly applied at the local level, they normally rely on parameters identified based on global experimental tests results. The aim of this study is to analyze the applicability of the Amontons-Coulomb's friction coefficient identified using complementary tests: (i) load-scanning, at the local level and (ii) draw-bead, at the global level; to the numerical simulation of sheet metal forming processes.

Oliveira, M. C.; Menezes, L. F.; Ramalho, A. [CEMUC, Department of Mechanical Engineering, University of Coimbra, Polo II, Rua Luis Reis Santos, Pinhal de Marrocos, 3030-788 Coimbra (Portugal); Alves, J. L. [Department of Mechanical Engineering, University of Minho, Campus de Azurem, 4800-058, Guimaraes (Portugal)

2011-05-04T23:59:59.000Z

254

The impact of global nuclear mass model uncertainties on $r$-process abundance predictions  

E-Print Network [OSTI]

Rapid neutron capture or `$r$-process' nucleosynthesis may be responsible for half the production of heavy elements above iron on the periodic table. Masses are one of the most important nuclear physics ingredients that go into calculations of $r$-process nucleosynthesis as they enter into the calculations of reaction rates, decay rates, branching ratios and Q-values. We explore the impact of uncertainties in three nuclear mass models on $r$-process abundances by performing global monte carlo simulations. We show that root-mean-square (rms) errors of current mass models are large so that current $r$-process predictions are insufficient in predicting features found in solar residuals and in $r$-process enhanced metal poor stars. We conclude that the reduction of global rms errors below $100$ keV will allow for more robust $r$-process predictions.

Mumpower, M; Aprahamian, A

2014-01-01T23:59:59.000Z

255

A global 3D P-velocity model of the Earth's crust and mantle for improved event location.  

SciTech Connect (OSTI)

To test the hypothesis that high quality 3D Earth models will produce seismic event locations which are more accurate and more precise, we are developing a global 3D P wave velocity model of the Earth's crust and mantle using seismic tomography. In this paper, we present the most recent version of our model, SALSA3D (SAndia LoS Alamos) version 1.4, and demonstrate its ability to reduce mislocations for a large set of realizations derived from a carefully chosen set of globally-distributed ground truth events. Our model is derived from the latest version of the Ground Truth (GT) catalog of P and Pn travel time picks assembled by Los Alamos National Laboratory. To prevent over-weighting due to ray path redundancy and to reduce the computational burden, we cluster rays to produce representative rays. Reduction in the total number of ray paths is > 55%. The model is represented using the triangular tessellation system described by Ballard et al. (2009), which incorporates variable resolution in both the geographic and radial dimensions. For our starting model, we use a simplified two layer crustal model derived from the Crust 2.0 model over a uniform AK135 mantle. Sufficient damping is used to reduce velocity adjustments so that ray path changes between iterations are small. We obtain proper model smoothness by using progressive grid refinement, refining the grid only around areas with significant velocity changes from the starting model. At each grid refinement level except the last one we limit the number of iterations to prevent convergence thereby preserving aspects of broad features resolved at coarser resolutions. Our approach produces a smooth, multi-resolution model with node density appropriate to both ray coverage and the velocity gradients required by the data. This scheme is computationally expensive, so we use a distributed computing framework based on the Java Parallel Processing Framework, providing us with {approx}400 processors. Resolution of our model is assessed using a variation of the standard checkerboard method, as well as by directly estimating the diagonal of the model resolution matrix based on the technique developed by Bekas, et al. We compare the travel-time prediction and location capabilities of this model over standard 1D models. We perform location tests on a global, geographically-distributed event set with ground truth levels of 5 km or better. These events generally possess hundreds of Pn and P phases from which we can generate different realizations of station distributions, yielding a range of azimuthal coverage and proportions of teleseismic to regional arrivals, with which we test the robustness and quality of relocation. The SALSA3D model reduces mislocation over standard 1D ak135, especially with increasing azimuthal gap. The 3D model appears to perform better for locations based solely or dominantly on regional arrivals, which is not unexpected given that ak135 represents a global average and cannot therefore capture local and regional variations.

Ballard, Sanford; Encarnacao, Andre Villanova; Begnaud, Michael A. (Los Alamos National Laboratories); Rowe, Charlotte A. (Los Alamos National Laboratories); Lewis, Jennifer E.; Young, Christopher John; Chang, Marcus C.; Hipp, James Richard

2010-04-01T23:59:59.000Z

256

South America Global Horizontal SR Solar Model from INPE and LABSOLAR |  

Open Energy Info (EERE)

727 727 Varnish cache server Browse Upload data GDR 429 Throttled (bot load) Error 429 Throttled (bot load) Throttled (bot load) Guru Meditation: XID: 2142256727 Varnish cache server South America Global Horizontal SR Solar Model from INPE and LABSOLAR Dataset Summary Description (Abstract): Mean values of Global Horizontal Solar Radiation in kWh/m2/day for 40km cells for 1 year (month, season, year) based on data from 1995 to 2005 (Purpose): To provide a set of consistent, reliable, verifiable, and accessible global data sets for international and in-country investors and other stakeholders. (Supplemental Information): The BRASIL-SR model (developed by INPE - National Institute for Space Research) and the ARCVIEW software were used to produce the dataset and SHAPE files. The assessment of reliability levels of the BRASIL-SR model were performed through the evaluation of the deviations shown by the estimated values for solar radiation flux vis-à-vis the values measured at the surface (ground truth). This evaluation was done in two phases. The first phase consisted in an inter-comparison between the core radiation transfer models adopted by the SWERA Project to map the solar energy in the various countries participating in the project. The HELIOSAT model took part in this phase like benchmark due to its employment to map solar energy resources in countries from European Union. In the second phase, the solar flux estimates provided by the BRASIL-SR model were compared with measured values acquired at several solarimetric stations spread along the Brazilian territory. The BRASIL-SR model is not validated for areas covered by snow.

257

Progress in the Development of Global Medium-Energy Nucleon-Nucleus Optical Model Potentials  

E-Print Network [OSTI]

Two existing global medium-energy nucleon-nucleus phenomenological optical model potentials are described and compared with experiment and with each other. The first of these employs a Dirac approach (second-order reduction) that is global in projectile energy and projectile isospin and applies to the target nucleus 208-Pb. Here the standard S-V (isoscalar-scalar, isoscalar-vector) model has been extended to include the corresponding isovector components by introduction of a relativistic Lane model. The second of these employs a relativistic equivalent to the Schroedinger equation and is global in projectile energy, projectile isospin, and target (Z,A). Here, particular attention is given to predictions for the integrated scattering observables - neutron total cross sections and proton total reaction cross sections - and their sensitivity to the absorptive parts of the potential. Finally, current work is described and the influence of the nuclear bound state problem (treated in relativistic mean field theory) on the Dirac scattering problem is mentioned.

David G. Madland

1997-02-14T23:59:59.000Z

258

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

259

L{sup 2}-stability of the Vlasov-Maxwell-Boltzmann system near global Maxwellians  

SciTech Connect (OSTI)

We present a L{sup 2}-stability theory of the Vlasov-Maxwell-Boltzmann system for the two-species collisional plasma. We show that in a perturbative regime of a global Maxwellian, the L{sup 2}-distance between two strong solutions can be controlled by that between initial data in a Lipschitz manner. Our stability result extends earlier results [Ha, S.-Y. and Xiao, Q.-H., “A revisiting to the L{sup 2}-stability theory of the Boltzmann equation near global Maxwellians,” (submitted) and Ha, S.-Y., Yang, X.-F., and Yun, S.-B., “L{sup 2} stability theory of the Boltzmann equation near a global Maxwellian,” Arch. Ration. Mech. Anal. 197, 657–688 (2010)] on the L{sup 2}-stability of the Boltzmann equation to the Boltzmann equation coupled with self-consistent external forces. As a direct application of our stability result, we show that classical solutions in Duan et al. [“Optimal large-time behavior of the Vlasov-Maxwell-Boltzmann system in the whole space,” Commun. Pure Appl. Math. 24, 1497–1546 (2011)] and Guo [“The Vlasov-Maxwell-Boltzmann system near Maxwellians,” Invent. Math. 153(3), 593–630 (2003)] satisfy a uniform L{sup 2}-stability estimate. This is the first result on the L{sup 2}-stability of the Boltzmann equation coupled with self-consistent field equations in three dimensions.

Ha, Seung-Yeal, E-mail: syha@snu.ac.kr; Xiao, Qinghua, E-mail: pdexqh@hotmail.com [Department of Mathematical Sciences, Seoul National University, Seoul 151-747 (Korea, Republic of)] [Department of Mathematical Sciences, Seoul National University, Seoul 151-747 (Korea, Republic of); Xiong, Linjie, E-mail: xlj@whu.edu.cn; Zhao, Huijiang, E-mail: hhjjzhao@hotmail.com [School of Mathematics and Statistics, Wuhan University, Wuhan 430072 (China)] [School of Mathematics and Statistics, Wuhan University, Wuhan 430072 (China)

2013-12-15T23:59:59.000Z

260

On the relationship between uncertainties in tropical divergence and the hydrological cycle in global models  

SciTech Connect (OSTI)

A survey of tropical divergence from three GCMs, three global reanalyses and four insitu soundings from field campaigns shows the existence of large uncertainties in the ubiquity of shallow divergent circulation as well as the depth and strength of the deep divergent circulation. More specifically, only two GCMs out of the three GCMs and three global reanalyses show significant shallow divergent circulation, which is present in all in-situ soundings, and of the three GCMs and three global reanalyses, only two global reanalyses have deep divergence profiles that lie within the range of uncertainty of the soundings. The relationships of uncertainties in the shallow and deep divergent circulation to uncertainties in present day and projected strength of the hydrological cycle from the GCMs are assessed. In the tropics and subtropics, deep divergent circulation is the largest contributor to moisture convergence that balances the net precipitation, and inter-model differences in the present day simulations carry over onto the future projections. In comparison to the soundings and reanalyses, the GCMs are found to have deeper and stronger divergent circulation. While these two characteristics of GCM divergence affect the strength of the hydrological cycle, they tend to compensate for each other so that their combined effect is relatively modest.

Hagos, Samson M.; Leung, Lai-Yung R.

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "global system modeling" 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

Numerical Weather Prediction (NWP) and hybrid ARMA/ANN model to predict global radiation  

E-Print Network [OSTI]

We propose in this paper an original technique to predict global radiation using a hybrid ARMA/ANN model and data issued from a numerical weather prediction model (ALADIN). We particularly look at the Multi-Layer Perceptron. After optimizing our architecture with ALADIN and endogenous data previously made stationary and using an innovative pre-input layer selection method, we combined it to an ARMA model from a rule based on the analysis of hourly data series. This model has been used to forecast the hourly global radiation for five places in Mediterranean area. Our technique outperforms classical models for all the places. The nRMSE for our hybrid model ANN/ARMA is 14.9% compared to 26.2% for the na\\"ive persistence predictor. Note that in the stand alone ANN case the nRMSE is 18.4%. Finally, in order to discuss the reliability of the forecaster outputs, a complementary study concerning the confidence interval of each prediction is proposed

Voyant, Cyril; Paoli, Christophe; Nivet, Marie Laure

2012-01-01T23:59:59.000Z

262

LONG-TERM GLOBAL WATER USE PROJECTIONS USING SIX SOCIOECONOMIC SCENARIOS IN AN INTEGRATED ASSESSMENT MODELING FRAMEWORK  

SciTech Connect (OSTI)

In this paper, we assess future water demands for the agricultural (irrigation and livestock), energy (electricity generation, primary energy production and processing), industrial (manufacturing and mining), and municipal sectors, by incorporating water demands into a technologically-detailed global integrated assessment model of energy, agriculture, and climate change – the Global Change Assessment Model (GCAM). Base-year water demands—both gross withdrawals and net consumptive use—are assigned to specific modeled activities in a way that maximizes consistency between bottom-up estimates of water demand intensities of specific technologies and practices, and top-down regional and sectoral estimates of water use. The energy, industrial, and municipal sectors are represented in fourteen geopolitical regions, with the agricultural sector further disaggregated into as many as eighteen agro-ecological zones (AEZs) within each region. We assess future water demands representing six socioeconomic scenarios, with no constraints imposed by future water supplies. The scenarios observe increases in global water withdrawals from 3,578 km3 year-1 in 2005 to 5,987 – 8,374 km3 year-1 in 2050, and to 4,719 – 12,290 km3 year-1 in 2095. Comparing the projected total regional water withdrawals to the historical supply of renewable freshwater, the Middle East exhibits the highest levels of water scarcity throughout the century, followed by India; water scarcity increases over time in both of these regions. In contrast, water scarcity improves in some regions with large base-year electric sector withdrawals, such as the USA and Canada, due to capital stock turnover and the almost complete phase-out of once-through flow cooling systems. The scenarios indicate that: 1) water is likely a limiting factor in climate change mitigation policies, 2) many regions can be expected to increase reliance on non-renewable groundwater, water reuse, and desalinated water, but they also highlight an important role for development and deployment of water conservation technologies and practices.

Hejazi, Mohamad I.; Edmonds, James A.; Clarke, Leon E.; Kyle, G. Page; Davies, Evan; Chaturvedi, Vaibhav; Wise, Marshall A.; Patel, Pralit L.; Eom, Jiyong; Calvin, Katherine V.; Moss, Richard H.; Kim, Son H.

2014-01-19T23:59:59.000Z

263

System Size Resonance in Coupled Noisy Systems and in the Ising Model  

Science Journals Connector (OSTI)

We consider an ensemble of coupled nonlinear noisy oscillators demonstrating in the thermodynamic limit an Ising-type transition. In the ordered phase and for finite ensembles stochastic flips of the mean field are observed with the rate depending on the ensemble size. When a small periodic force acts on the ensemble, the linear response of the system has a maximum at a certain system size, similar to the stochastic resonance phenomenon. We demonstrate this effect of system size resonance for different types of noisy oscillators and for different ensembles—lattices with nearest neighbors coupling and globally coupled populations. The Ising model is also shown to demonstrate the system size resonance.

A. Pikovsky; A. Zaikin; M. A. de la Casa

2002-01-16T23:59:59.000Z

264

Global existence and $L^{p}$ convergence rates of planar waves for three-dimensional bipolar Euler-Poisson systems  

E-Print Network [OSTI]

In the paper, we consider a multi-dimensional bipolar hydrodynamic model from semiconductor devices and plasmas. This system takes the form of Euler-Poisson with electric field and frictional damping added to the momentum equations. We show the global existence and $L^{p}$ convergence rates of planar diffusion waves for multi-dimensional bipolar Euler-Poisson systems when the initial data are near the planar diffusive waves. A frequency decomposition and approximate Green function based on delicate energy method are used to get the optimal decay rates of the planar diffusion waves. To our knowledge, the $L^p(p\\in[2,+\\infty])$-convergence rate of planar waves improves the previous results about the $L^2$-convergence rates.

Jie Liao; Yeping Li

2015-01-24T23:59:59.000Z

265

Modeling the Recent Evolution of Global Drought and Projections for the Twenty-First Century with the Hadley Centre Climate Model  

Science Journals Connector (OSTI)

Meteorological drought in the Hadley Centre global climate model is assessed using the Palmer Drought Severity Index (PDSI), a commonly used drought index. At interannual time scales, for the majority of the land surface, the model captures the ...

Eleanor J. Burke; Simon J. Brown; Nikolaos Christidis

2006-10-01T23:59:59.000Z

266

On the Global Existence for the Axisymmetric Euler-Boussinesq System in Critical Besov Spaces  

E-Print Network [OSTI]

This paper is devoted to the global existence and uniqueness results for the three-dimensional Boussinesq system with axisymmetric initial data $v^{0}{\\in}B_{2,1}^{5/2}(\\RR^3)$ and$ ${\\rho}^{0}{\\in}B_{2,1}^{1/2}(\\RR^3)\\cap L^{p}(\\RR^3)$ with $p>6.$ This system couples the incompressible Euler equations with a transport-diffusion equation governing the density. In this case the Beale-Kato-Majda criterion is not known to be valid and to circumvent this difficulty we use in a crucial way some geometric properties of the vorticity.

Sulaiman, Samira

2012-01-01T23:59:59.000Z

267

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

268

Brazil Global Horizontal Solar Radiation Model (40km) from INPE | OpenEI  

Open Energy Info (EERE)

40km) from INPE 40km) from INPE Dataset Summary Description (Abstract): Global horizontal solar radiation in kWh/m2/day for 1 year organized into cells with 40km x 40km (Purpose): To provide a set of consistent, reliable, verifiable, and accessible global data sets for international and in-country investors and other stakeholders (Supplemental Information): The BRASIL-SR model and the SPRING software (both developed by INPE - National Institute for Space Research) were used to produce the dataset and SHAPE files. The assessment of reliability levels of the BRASIL-SR model were performed through the evaluation of the deviations shown by the estimated values for solar radiation flux vis-à-vis the values measured at the surface (ground truth). This evaluation was done in two phases. The first phase consisted in an inter-comparison between the core radiation transfer models adopted by the SWERA Project to map the solar energy in the various countries participating in the project. The HELIOSAT model took art in this phase like benchmark due to its employment to map solar energy resources in countries from European Union. In the second phase, the solar flux estimates provided by the BRASIL-SR model were compared with measured values acquired at several solarimetric stations spread along the Brazilian territory.

269

Integration of Global Positioning System and Scanning Water Vapor Radiometers for Precipitable Water Vapor and Cloud Liquid Path Estimates  

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

Integration of Global Positioning System and Scanning Integration of Global Positioning System and Scanning Water Vapor Radiometers for Precipitable Water Vapor and Cloud Liquid Path Estimates V. Mattioli and P. Basili Department of Electronic and Information Engineering University of Perugia Perugia, Italy E. R. Westwater Cooperative Institute for Research in Environmental Sciences University of Colorado National Oceanic and Atmospheric Administration Environmental Technology Laboratory Boulder, Colorado Introduction In recent years the Global Positioning System (GPS) has proved to be a reliable instrument for measuring precipitable water vapor (PWV) (Bevis et al. 1992), offering an independent source of information on water vapor when compared with microwave radiometers (MWRs), and/or radiosonde

270

The new GFDL global atmosphere and land model AM2/LM2: Evaluation with prescribed SST simulations  

E-Print Network [OSTI]

The new GFDL global atmosphere and land model AM2/LM2: Evaluation with prescribed SST simulations climatology, and components from previous models used at GFDL. The land model, known as LM2, includes soil of the coupled model AM2/LM2 is evaluated with a series of prescribed sea-surface temperature (SST) simulations

Bretherton, Chris

271

Effect of Terrestrial and Marine Organic Aerosol on Regional and Global Climate: Model Development, Application, and Verification with Satellite Data  

SciTech Connect (OSTI)

In this DOE project the improvements to parameterization of marine primary organic matter (POM) emissions, hygroscopic properties of marine POM, marine isoprene derived secondary organic aerosol (SOA) emissions, surfactant effects, new cloud droplet activation parameterization have been implemented into Community Atmosphere Model (CAM 5.0), with a seven mode aerosol module from the Pacific Northwest National Laboratory (PNNL)���¢��������s Modal Aerosol Model (MAM7). The effects of marine aerosols derived from sea spray and ocean emitted biogenic volatile organic compounds (BVOCs) on microphysical properties of clouds were explored by conducting 10 year CAM5.0-MAM7 model simulations at a grid resolution 1.9�������°��������2.5�������° with 30 vertical layers. Model-predicted relationship between ocean physical and biological systems and the abundance of CCN in remote marine atmosphere was compared to data from the A-Train satellites (MODIS, CALIPSO, AMSR-E). Model simulations show that on average, primary and secondary organic aerosol emissions from the ocean can yield up to 20% increase in Cloud Condensation Nuclei (CCN) at 0.2% Supersaturation, and up to 5% increases in droplet number concentration of global maritime shallow clouds. Marine organics were treated as internally or externally mixed with sea salt. Changes associated with cloud properties reduced (absolute value) the model-predicted short wave cloud forcing from -1.35 Wm-2 to -0.25 Wm-2. By using different emission scenarios, and droplet activation parameterizations, this study suggests that addition of marine primary aerosols and biologically generated reactive gases makes an important difference in radiative forcing assessments. All baseline and sensitivity simulations for 2001 and 2050 using global-through-urban WRF/Chem (GU-WRF) were completed. The main objective of these simulations was to evaluate the capability of GU-WRF for an accurate representation of the global atmosphere by exploring the most accurate configuration of physics options in GWRF for global scale modeling in 2001 at a horizontal grid resolution of 1�������° x 1�������°. GU-WRF model output was evaluated using observational datasets from a variety of sources including surface based observations (NCDC and BSRN), model reanalysis (NCEP/ NCAR Reanalysis and CMAP), and remotely-sensed data (TRMM) to evaluate the ability of GU-WRF to simulate atmospheric variables at the surface as well as aloft. Explicit treatment of nanoparticles produced from new particle formation in GU-WRF/Chem-MADRID was achieved by expanding particle size sections from 8 to 12 to cover particles with the size range of 1.16 nm to 11.6 �������µm. Simulations with two different nucleation parameterizations were conducted for August 2002 over a global domain at a 4�������º by 5�������º horizontal resolution. The results are evaluated against field measurement data from the 2002 Aerosol Nucleation and Real Time Characterization Experiment (ANARChE) in Atlanta, Georgia, as well as satellite and reanalysis data. We have also explored the relationship between ���¢��������clean marine���¢������� aerosol optical properties and ocean surface wind speed using remotely sensed data from the Cloud-Aerosol Lidar with Orthogonal Polarization (CALIOP) on board the CALIPSO satellite and the Advanced Microwave Scanning Radiometer (AMSR-E) on board the AQUA satellite. Detailed data analyses

Meskhidze, Nicholas; Zhang, Yang; Kamykowski, Daniel

2012-03-28T23:59:59.000Z

272

Supplementary Information for: Global soil carbon projections are improved by modeling microbial processes. William R. Wieder, Gordon B. Bonan, & Steven D. Allison (2.1 MB .pdf)  

E-Print Network [OSTI]

total = 660 Pg C; (b) Observed soil profile, global total = 1259 Pg C; (c) CLM microbial model surface soils, global total = 784 Pg C [spatial correlation with observations (r) = 0.75, model-weighted root mean square error (RMSE) = 2.9 kg C m-2 ]; (d) CLM microbial model soil profile, global total = 1310 Pg

Saleska, Scott

273

Reliability-based synthesis of non-linear stochastic dynamical systems: a global approximation approach  

Science Journals Connector (OSTI)

The paper presents an efficient methodology to carry out reliability-based structural optimisation of non-linear systems under stochastic loading. The optimisation problem is formulated as the minimisation of an objective function subject to multiple reliability constraints. The reliability constraints are given in terms of first excursion probabilities with large state-space dimensions. A sequential approximate optimisation scheme based on global approximations of the reliability constraints is implemented in the proposed formulation. The approximations of the first excursion probabilities in terms of the design variables are constructed by combining a global mixed linearisation approach with a reliability sensitivity analysis. The sensitivity of the first excursion probabilities are estimated by considering some statistics of an augmented reliability problem. The number of reliability estimations required during the optimal design process is generally very small. Two numerical examples are presented to illustrate the effectiveness of the method.

Hector A. Jensen; Macarena S. Ferre; Danilo S. Kusanovic

2010-01-01T23:59:59.000Z

274

Posters Radiation Impacts on Global Climate Models F. Baer, N. Arsky, and K. Rocque  

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

5 5 Posters Radiation Impacts on Global Climate Models F. Baer, N. Arsky, and K. Rocque University of Maryland College Park, Maryland Climate Prediction and Radiative Heating Climate models are driven by forcing, and these forces are seen primarily by the thermal field in general circulation models (GCMs). The major forces that affect the thermal field are longwave radiative (LWR) heating, shortwave radiative (SWR) heating, and convection (cumulus, etc.). These forcing effects are cycled through the thermal field to the motion field by nonlinear transfer. The dependent variables-in particular, temperature (T), moisture (Q) and especially clouds-evolve in time in a model and determine the subsequent forcing. If the dependent variables are not accurately calculated in space and time, the forcing

275

Integration of EBS Models with Generic Disposal System Models | Department  

Broader source: Energy.gov (indexed) [DOE]

Integration of EBS Models with Generic Disposal System Models Integration of EBS Models with Generic Disposal System Models Integration of EBS Models with Generic Disposal System Models This report summarizes research activities on engineered barrier system (EBS) model integration with the generic disposal system model (GDSM), and used fuel degradation and radionuclide mobilization (RM) in support of the EBS evaluation and tool development within the Used Fuel Disposition campaign. This report addresses: predictive model capability for used nuclear fuel degradation based on electrochemical and thermodynamic principles, radiolysis model to evaluate the U(VI)-H2O-CO2 system, steps towards the evaluation of uranium alteration products, discussion of instant release fraction (IRF) of radionuclides from the nuclear fuel, and

276

Integration of EBS Models with Generic Disposal System Models | Department  

Broader source: Energy.gov (indexed) [DOE]

Integration of EBS Models with Generic Disposal System Models Integration of EBS Models with Generic Disposal System Models Integration of EBS Models with Generic Disposal System Models This report summarizes research activities on engineered barrier system (EBS) model integration with the generic disposal system model (GDSM), and used fuel degradation and radionuclide mobilization (RM) in support of the EBS evaluation and tool development within the Used Fuel Disposition campaign. This report addresses: predictive model capability for used nuclear fuel degradation based on electrochemical and thermodynamic principles, radiolysis model to evaluate the U(VI)-H2O-CO2 system, steps towards the evaluation of uranium alteration products, discussion of instant release fraction (IRF) of radionuclides from the nuclear fuel, and

277

Global Clock, Physical Time Order and Pending Period Analysis in Multiprocessor Systems  

E-Print Network [OSTI]

In multiprocessor systems, various problems are treated with Lamport's logical clock and the resultant logical time orders between operations. However, one often needs to face the high complexities caused by the lack of logical time order information in practice. In this paper, we utilize the \\emph{global clock} to infuse the so-called \\emph{pending period} to each operation in a multiprocessor system, where the pending period is a time interval that contains the performed time of the operation. Further, we define the \\emph{physical time order} for any two operations with disjoint pending periods. The physical time order is obeyed by any real execution in multiprocessor systems due to that it is part of the truly happened operation orders restricted by global clock, and it is then proven to be independent and consistent with traditional logical time orders. The above novel yet fundamental concepts enables new effective approaches for analyzing multiprocessor systems, which are named \\emph{pending period analy...

Chen, Yunji; Hu, Weiwu

2009-01-01T23:59:59.000Z

278

Semantic Modeling of the Emissions Trading System  

Science Journals Connector (OSTI)

Fight against global warming is a tough challenge requiring synergic efforts from governments, industry and scientific communities. Facing these challenges by means of sectorial or local approaches is a loosing strategy. A holistic approach is required ... Keywords: Low Carbon Society, Emissions Trading System, Ontology, Rules, Semantic Services

Cecilia Camporeale; Antonio De Nicola; Vittorio Rosato; Maria Luisa Villani; Umberto Ciorba

2013-08-01T23:59:59.000Z

279

NUCLEAR ENERGY SYSTEM COST MODELING  

SciTech Connect (OSTI)

The U.S. Department of Energy’s Fuel Cycle Technologies (FCT) Program is preparing to perform an evaluation of the full range of possible Nuclear Energy Systems (NES) in 2013. These include all practical combinations of fuels and transmuters (reactors and sub-critical systems) in single and multi-tier combinations of burners and breeders with no, partial, and full recycle. As part of this evaluation, Levelized Cost of Electricity at Equilibrium (LCAE) ranges for each representative system will be calculated. To facilitate the cost analyses, the 2009 Advanced Fuel Cycle Cost Basis Report is being amended to provide up-to-date cost data for each step in the fuel cycle, and a new analysis tool, NE-COST, has been developed. This paper explains the innovative “Island” approach used by NE-COST to streamline and simplify the economic analysis effort and provides examples of LCAE costs generated. The Island approach treats each transmuter (or target burner) and the associated fuel cycle facilities as a separate analysis module, allowing reuse of modules that appear frequently in the NES options list. For example, a number of options to be screened will include a once-through uranium oxide (UOX) fueled light water reactor (LWR). The UOX LWR may be standalone, or may be the first stage in a multi-stage system. Using the Island approach, the UOX LWR only needs to be modeled once and the module can then be reused on subsequent fuel cycles. NE-COST models the unit operations and life cycle costs associated with each step of the fuel cycle on each island. This includes three front-end options for supplying feedstock to fuel fabrication (mining/enrichment, reprocessing of used fuel from another island, and/or reprocessing of this island’s used fuel), along with the transmuter and back-end storage/disposal. Results of each island are combined based on the fractional energy generated by each islands in an equilibrium system. The cost analyses use the probability distributions of key parameters and employs Monte Carlo sampling to arrive at an island’s cost probability density function (PDF). When comparing two NES to determine delta cost, strongly correlated parameters can be cancelled out so that only the differences in the systems contribute to the relative cost PDFs. For example, one comparative analysis presented in the paper is a single stage LWR-UOX system versus a two-stage LWR-UOX to LWR-MOX system. In this case, the first stage of both systems is the same (but with different fractional energy generation), while the second stage of the UOX to MOX system uses the same type transmuter but the fuel type and feedstock sources are different. In this case, the cost difference between systems is driven by only the fuel cycle differences of the MOX stage.

Francesco Ganda; Brent Dixon

2012-09-01T23:59:59.000Z

280

Next-Generation Algorithms for Navigation, Geodesy and~Earth Sciences Under Modernized Global Navigation Satellite Systems (GNSS)  

Science Journals Connector (OSTI)

The project on “Next-generation algorithms for navigation, geodesy and earth sciences under modernized Global Navigation Satellite Systems (GNSS)” has been under development within the scope of the Geomatics f...

Marcelo C Santos; Richard B Langley; Rodrigo F Leandro…

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "global system modeling" from the National Library of EnergyBeta (NLEBeta).
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281

Modeling the Earth System, volume 3  

SciTech Connect (OSTI)

The topics covered fall under the following headings: critical gaps in the Earth system conceptual framework; development needs for simplified models; and validating Earth system models and their subcomponents.

Ojima, D.

1992-01-01T23:59:59.000Z

282

National Energy Modeling System (NEMS)  

DOE Data Explorer [Office of Scientific and Technical Information (OSTI)]

The National Energy Modeling System (NEMS) is a computer-based, energy-economy modeling system of U.S. through 2030. NEMS projects the production, imports, conversion, consumption, and prices of energy, subject to assumptions on macroeconomic and financial factors, world energy markets, resource availability and costs, behavioral and technological choice criteria, cost and performance characteristics of energy technologies, and demographics. NEMS was designed and implemented by the Energy Information Administration (EIA) of the U.S. Department of Energy (DOE). NEMS can be used to analyze the effects of existing and proposed government laws and regulations related to energy production and use; the potential impact of new and advanced energy production, conversion, and consumption technologies; the impact and cost of greenhouse gas control; the impact of increased use of renewable energy sources; and the potential savings from increased efficiency of energy use; and the impact of regulations on the use of alternative or reformulated fuels. NEMS has also been used for a number of special analyses at the request of the Administration, U.S. Congress, other offices of DOE and other government agencies, who specify the scenarios and assumptions for the analysis. Modules allow analyses to be conducted in energy topic areas such as residential demand, industrial demand, electricity market, oil and gas supply, renewable fuels, etc.

283

Evaluating Clouds, Aerosols, and their Interactions in Three Global Climate Models using COSP and Satellite Observations  

SciTech Connect (OSTI)

Accurately representing aerosol-cloud interactions in global climate models is challenging. As parameterizations evolve, it is important to evaluate their performance with appropriate use of observations. In this work we compare aerosols, clouds, and their interactions in three climate models (AM3, CAM5, ModelE) to MODIS satellite observations. Modeled cloud properties were diagnosed using the CFMIP Observations Simulator Package (COSP). Cloud droplet number concentrations (N) were derived using the same algorithm for both satellite-simulated model values and observations. We find that aerosol optical depth tau simulated by models is similar to observations. For N, AM3 and CAM5 capture the observed spatial pattern of higher values in near-coast versus remote ocean regions, though modeled values in general are higher than observed. In contrast, ModelE simulates lower N in most near-coast versus remote regions. Aerosol- cloud interactions were computed as the sensitivity of N to tau for marine liquid clouds off the coasts of South Africa and Eastern Asia where aerosol pollution varies in time. AM3 and CAM5 are in most cases more sensitive than observations, while the sensitivity for ModelE is statistically insignificant. This widely used sensitivity could be subject to misinterpretation due to the confounding influence of meteorology on both aerosols and clouds. A simple framework for assessing the N – tau sensitivity at constant meteorology illustrates that observed sensitivity can change from positive to statistically insignificant when including the confounding influence of relative humidity. Satellite simulated values of N were compared to standard model output and found to be higher with a bias of 83 cm-3.

Ban-Weiss, George; Jin, Ling; Bauer, S.; Bennartz, Ralph; Liu, Xiaohong; Zhang, Kai; Ming, Yi; Guo, Huan; Jiang, Jonathan

2014-09-23T23:59:59.000Z

284

Runtime Tracing of The Community Earth System Model: Feasibility and Benefits  

SciTech Connect (OSTI)

Community Earth System Models (CESM) is one of US's leading earth system modeling systems, which has over decades of development history and embraced by large, active user communities. In this paper, we first review the history of CESM software development and layout the general objectives of performance analysis. Then we present an offline global community land model simulation within the CESM framework to demonstrate the procedure of runtime tracing of CESM using the Vampir toolset. Finally, we explain the benefits of runtime tracing to the general earth system modeling community. We hope those considerations can also be beneficial to many other modeling research programs involving legacy high-performance computing applications.

Wang, Dali [ORNL] [ORNL; Domke, Jens [ORNL] [ORNL

2011-01-01T23:59:59.000Z

285

Using the Model Coupling Toolkit to couple earth system models  

Science Journals Connector (OSTI)

Continued advances in computational resources are providing the opportunity to operate more sophisticated numerical models. Additionally, there is an increasing demand for multidisciplinary studies that include interactions between different physical processes. Therefore there is a strong desire to develop coupled modeling systems that utilize existing models and allow efficient data exchange and model control. The basic system would entail model “1” running on “M” processors and model “2” running on “N” processors, with efficient exchange of model fields at predetermined synchronization intervals. Here we demonstrate two coupled systems: the coupling of the ocean circulation model Regional Ocean Modeling System (ROMS) to the surface wave model Simulating \\{WAves\\} Nearshore (SWAN), and the coupling of ROMS to the atmospheric model Coupled Ocean Atmosphere Prediction System (COAMPS). Both coupled systems use the Model Coupling Toolkit (MCT) as a mechanism for operation control and inter-model distributed memory transfer of model variables. In this paper we describe requirements and other options for model coupling, explain the MCT library, ROMS, SWAN and COAMPS models, methods for grid decomposition and sparse matrix interpolation, and provide an example from each coupled system. Methods presented in this paper are clearly applicable for coupling of other types of models.

John C. Warner; Natalie Perlin; Eric D. Skyllingstad

2008-01-01T23:59:59.000Z

286

Not All Salmon Are Created Equal: Life Cycle Assessment (LCA) of Global Salmon Farming Systems  

Science Journals Connector (OSTI)

Not All Salmon Are Created Equal: Life Cycle Assessment (LCA) of Global Salmon Farming Systems ... Life cycle assessment (LCA) is an ISO-standardized biophysical accounting framework used to (1) compile an inventory of material and energy inputs and outputs characteristic of each stage of a product life cycle and (2) quantify its contributions to a specified suite of resource use and emissions-related environmental impact categories (8, 9). ... System boundaries for a cradle-to-farm-gate LCA of live-weight salmon production in Norway, the UK, Canada, and Chile (gray font denotes background system data derived from the EcoInvent database, modified as appropriate to conform to regional conditions). ...

Nathan Pelletier; Peter Tyedmers; Ulf Sonesson; Astrid Scholz; Friederike Ziegler; Anna Flysjo; Sarah Kruse; Beatriz Cancino; Howard Silverman

2009-10-23T23:59:59.000Z

287

Model Transformation for Cyber Physical Systems  

Science Journals Connector (OSTI)

Cyber Physical Systems(CPS) are composed with discrete and continuous dynamics. Traditional modeling techniques can’t implement the requirement of modeling CPS. One way of solving this is to model CPS parts wi...

Shuguang Feng; Lichen Zhang

2014-01-01T23:59:59.000Z

288

An Evaluation of the Environmental Impact of Different Commercial Supermarket Refrigeration Systems Using Low Global Warming Potential Refrigerants  

SciTech Connect (OSTI)

Commercial refrigeration systems consumed 1.21 Quads of primary energy in 2010 and are known to be a major source for refrigerant charge leakage into the environment. Thus, it is important to study the environmental impact of commercial supermarket refrigeration systems and improve their design to minimize any adverse impacts. The system s Life Cycle Climate Performance (LCCP) was presented as a comprehensive metric with the aim of calculating the equivalent mass of carbon dioxide released into the atmosphere throughout its lifetime, from construction to operation and destruction. In this paper, an open source tool for the evaluation of the LCCP of different air-conditioning and refrigeration systems is presented and used to compare the environmental impact of a typical multiplex direct expansion (DX) supermarket refrigeration systems based on three different refrigerants as follows: two hydrofluorocarbon (HFC) refrigerants (R-404A, and R-407F), and a low global warming potential (GWP) refrigerant (N-40). The comparison is performed in 8 US cities representing different climates. The hourly energy consumption of the refrigeration system, required for the calculation of the indirect emissions, is calculated using a widely used building energy modeling tool (EnergyPlus). A sensitivity analysis is performed to determine the impact of system charge and power plant emission factor on the LCCP results. Finally, we performed an uncertainty analysis to determine the uncertainty in total emissions for both R-404A and N-40 operated systems. We found that using low GWP refrigerants causes a considerable drop in the impact of uncertainty in the inputs related to direct emissions on the uncertainty of the total emissions of the system.

Beshr, Mohamed [University of Maryland, College Park; Aute, Vikrant [University of Maryland, College Park; Abdelaziz, Omar [ORNL; Fricke, Brian A [ORNL; Radermacher, Reinhard [University of Maryland, College Park

2014-01-01T23:59:59.000Z

289

Technical and economical system comparison of photovoltaic and concentrating solar thermal power systems depending on annual global irradiation  

Science Journals Connector (OSTI)

Concentrating solar thermal power and photovoltaics are two major technologies for converting sunlight to electricity. Variations of the annual solar irradiation depending on the site influence their annual efficiency, specific output and electricity generation cost. Detailed technical and economical analyses performed with computer simulations point out differences of solar thermal parabolic trough power plants, non-tracked and two-axis-tracked PV systems. Therefore, 61 sites in Europe and North Africa covering a global annual irradiation range from 923 to 2438 kW h/m2 a have been examined. Simulation results are usable irradiation by the systems, specific annual system output and levelled electricity cost. Cost assumptions are made for today's cost and expected cost in 10 years considering different progress ratios. This will lead to a cost reduction by 50% for PV systems and by 40% for solar thermal power plants. The simulation results show where are optimal regions for installing solar thermal trough and tracked PV systems in comparison to non-tracked PV. For low irradiation values the annual output of solar thermal systems is much lower than of PV systems. On the other hand, for high irradiations solar thermal systems provide the best-cost solution even when considering higher cost reduction factors for PV in the next decade. Electricity generation cost much below 10 Eurocents per kW h for solar thermal systems and about 12 Eurocents/kW h for PV can be expected in 10 years in North Africa.

Volker Quaschning

2004-01-01T23:59:59.000Z

290

Integrated Hydrogen Storage System Model  

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

WSRC-TR-2007-00440, REVISION 0 WSRC-TR-2007-00440, REVISION 0 Keywords: Hydrogen Kinetics, Hydrogen Storage Vessel Metal Hydride Retention: Permanent Integrated Hydrogen Storage System Model Bruce J. Hardy November 16, 2007 Washington Savannah River Company Savannah River Site Aiken, SC 29808 Prepared for the U.S. Department of Energy Under Contract Number DEAC09-96-SR18500 DISCLAIMER This report was prepared for the United States Department of Energy under Contract No. DE-AC09-96SR18500 and is an account of work performed under that contract. Neither the United States Department of Energy, nor WSRC, nor any of their employees makes any warranty, expressed or implied, or assumes any legal liability or responsibility for accuracy, completeness, or usefulness, of any information,

291

A Vast Machine Computer Models, Climate Data, and the Politics of Global Warming  

E-Print Network [OSTI]

. Climatology--History. 3. Meteorology--History. 4. Climatology--Technological innovation. 5. Global temperature

292

A fully traits-based approach to modeling global vegetation distribution  

Science Journals Connector (OSTI)

...biosphere–climate interactions. Despite their importance, DGVMs are among the most uncertain components of earth system models when predicting climate change (2). DGVMs have been built around the concept of Plant Functional Types (PFTs...

Peter M. van Bodegom; Jacob C. Douma; Lieneke M. Verheijen

2014-01-01T23:59:59.000Z

293

Comparison of Photovoltaic Models in the System Advisor Model: Preprint  

SciTech Connect (OSTI)

The System Advisor Model (SAM) is free software developed by the National Renewable Energy Laboratory (NREL) for predicting the performance of renewable energy systems and analyzing the financial feasibility of residential, commercial, and utility-scale grid-connected projects. SAM offers several options for predicting the performance of photovoltaic (PV) systems. The model requires that the analyst choose from three PV system models, and depending on that choice, possibly choose from three module and two inverter component models. To obtain meaningful results from SAM, the analyst must be aware of the differences between the model options and their applicability to different modeling scenarios. This paper presents an overview the different PV model options and presents a comparison of results for a 200-kW system using different model options.

Blair, N. J.; Dobos, A. P.; Gilman, P.

2013-08-01T23:59:59.000Z

294

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

295

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

296

Abstract--This paper presents novel Global Navigation Satellite System (GNSS)-based flight inspection systems  

E-Print Network [OSTI]

inspection systems (FIS) that outperform current flight inspection systems in terms of cost, efficiency, and integrity. The GNSS-based FIS are the WAAS-based FIS and the stand-alone GPS-based FIS. These GNSS-based FIS are onboard and do not use an INS or external reference stations at the airport. Instead, the WAAS-based FIS

Stanford University

297

Brazil Global Horizontal Solar Radiation Model (10km) from INPE | OpenEI  

Open Energy Info (EERE)

10km) from INPE 10km) from INPE Dataset Summary Description (Abstract): Global horizontal solar radiation in kWh/m2/day for 1 year organized into cells with 10km x 10km (Purpose): The BRASIL-SR model and the SPRING software (both developed by INPE - National Institute for Space Research) were used to produce the dataset and SHAPE files (Supplemental Information): The assessment of reliability levels of the BRASIL-SR model were performed through the evaluation of the deviations shown by the estimated values for solar radiation flux vis-à-vis the values measured at the surface (ground truth). This evaluation was done in two phases. The first phase consisted in an inter-comparison between the core radiation transfer models adopted by the SWERA Project to map the solar energy in the various countries participating in the project. The HELIOSAT model took part in this phase like benchmark due to its employment to map solar energy resources in countries from European Union. In the second phase, the solar flux estimates provided by the BRASIL-SR model were compared with measured values acquired at several solarimetric stations spread along the Brazilian territory

298

Accounting for Global Climate Model Projection Uncertainty in Modern Statistical Downscaling  

SciTech Connect (OSTI)

Future climate change has emerged as a national and a global security threat. To carry out the needed adaptation and mitigation steps, a quantification of the expected level of climate change is needed, both at the global and the regional scale; in the end, the impact of climate change is felt at the local/regional level. An important part of such climate change assessment is uncertainty quantification. Decision and policy makers are not only interested in 'best guesses' of expected climate change, but rather probabilistic quantification (e.g., Rougier, 2007). For example, consider the following question: What is the probability that the average summer temperature will increase by at least 4 C in region R if global CO{sub 2} emission increases by P% from current levels by time T? It is a simple question, but one that remains very difficult to answer. It is answering these kind of questions that is the focus of this effort. The uncertainty associated with future climate change can be attributed to three major factors: (1) Uncertainty about future emission of green house gasses (GHG). (2) Given a future GHG emission scenario, what is its impact on the global climate? (3) Given a particular evolution of the global climate, what does it mean for a particular location/region? In what follows, we assume a particular GHG emission scenario has been selected. Given the GHG emission scenario, the current batch of the state-of-the-art global climate models (GCMs) is used to simulate future climate under this scenario, yielding an ensemble of future climate projections (which reflect, to some degree our uncertainty of being able to simulate future climate give a particular GHG scenario). Due to the coarse-resolution nature of the GCM projections, they need to be spatially downscaled for regional impact assessments. To downscale a given GCM projection, two methods have emerged: dynamical downscaling and statistical (empirical) downscaling (SDS). Dynamic downscaling involves configuring and running a regional climate model (RCM) nested within a given GCM projection (i.e., the GCM provides bounder conditions for the RCM). On the other hand, statistical downscaling aims at establishing a statistical relationship between observed local/regional climate variables of interest and synoptic (GCM-scale) climate predictors. The resulting empirical relationship is then applied to future GCM projections. A comparison of the pros and cons of dynamical versus statistical downscaling is outside the scope of this effort, but has been extensively studied and the reader is referred to Wilby et al. (1998); Murphy (1999); Wood et al. (2004); Benestad et al. (2007); Fowler et al. (2007), and references within those. The scope of this effort is to study methodology, a statistical framework, to propagate and account for GCM uncertainty in regional statistical downscaling assessment. In particular, we will explore how to leverage an ensemble of GCM projections to quantify the impact of the GCM uncertainty in such an assessment. There are three main component to this effort: (1) gather the necessary climate-related data for a regional SDS study, including multiple GCM projections, (2) carry out SDS, and (3) assess the uncertainty. The first step is carried out using tools written in the Python programming language, while analysis tools were developed in the statistical programming language R; see Figure 1.

Johannesson, G

2010-03-17T23:59:59.000Z

299

System Advisor Model (SAM) | Open Energy Information  

Open Energy Info (EERE)

System Advisor Model (SAM) System Advisor Model (SAM) Jump to: navigation, search Tool Summary LAUNCH TOOL Name: System Advisor Model Agency/Company /Organization: National Renewable Energy Laboratory Sector: Energy Focus Area: Geothermal, Solar, - Concentrating Solar Power, - Solar Hot Water, - Solar PV, Wind Phase: Evaluate Options, Develop Goals, Prepare a Plan Topics: Pathways analysis, Resource assessment Resource Type: Case studies/examples, Dataset, Guide/manual, Training materials, Software/modeling tools, Video User Interface: Desktop Application Website: sam.nrel.gov/ Web Application Link: sam.nrel.gov/ Cost: Free OpenEI Keyword(s): Featured, EERE tool, System Advisor Model, SAM Language: English System Advisor Model Screenshot References: SAM[1] System Advisor Model [2]

300

System Advisor Model (SAM) | Open Energy Information  

Open Energy Info (EERE)

System Advisor Model (SAM) System Advisor Model (SAM) (Redirected from System Advisor Model) Jump to: navigation, search Tool Summary LAUNCH TOOL Name: System Advisor Model Agency/Company /Organization: National Renewable Energy Laboratory Sector: Energy Focus Area: Geothermal, Solar, - Concentrating Solar Power, - Solar Hot Water, - Solar PV, Wind Phase: Evaluate Options, Develop Goals, Prepare a Plan Topics: Pathways analysis, Resource assessment Resource Type: Case studies/examples, Dataset, Guide/manual, Training materials, Software/modeling tools, Video User Interface: Desktop Application Website: sam.nrel.gov/ Web Application Link: sam.nrel.gov/ Cost: Free OpenEI Keyword(s): Featured, EERE tool, System Advisor Model, SAM Language: English System Advisor Model Screenshot

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


301

Bifurcation Analysis of Various Power System Models  

E-Print Network [OSTI]

generator and transmission system. Di erent modeling levels with their respective di erential-algebraic equa, the generation or system loading levels are used as bifurcation parameters, which are varied slowly, moving erent induction motor load models are considered. The loads were modeled as constant, linear

Cañizares, Claudio A.

302

SYSTEM MODELING AND ANALYSIS USING COMMUNICATION CHANNELS  

Science Journals Connector (OSTI)

In this study, we approach systems from an information theoretical perspective. Specifically, we propose a framework to model systems by noisy communication channels and analyze them by this framework whose elements are commonly used analysis tools in ... Keywords: Analysis, Information Theory, Modeling, Systems

Bunyamin Ozaydin; Murat M. Tanik

2011-01-01T23:59:59.000Z

303

3.System Design Basis 2) MODELING  

E-Print Network [OSTI]

BOG compressors with butane storage system is modelled for this report. 4) Modelling have been storage system except heat load and this level of detail was not required for dynamic simulation.(Refe to table 4.3.1) #12;9) One butane separator, pump and control system for many butane tanks boil off

Hong, Deog Ki

304

INTERPRETING THE GLOBAL 21 cm SIGNAL FROM HIGH REDSHIFTS. I. MODEL-INDEPENDENT CONSTRAINTS  

SciTech Connect (OSTI)

The sky-averaged (global) 21 cm signal is a powerful probe of the intergalactic medium (IGM) prior to the completion of reionization. However, so far it has been unclear whether it will provide more than crude estimates of when the universe's first stars and black holes formed, even in the best case scenario in which the signal is accurately extracted from the foregrounds. In contrast to previous work, which has focused on predicting the 21 cm signatures of the first luminous objects, we investigate an arbitrary realization of the signal and attempt to translate its features to the physical properties of the IGM. Within a simplified global framework, the 21 cm signal yields quantitative constraints on the Ly? background intensity, net heat deposition, ionized fraction, and their time derivatives without invoking models for the astrophysical sources themselves. The 21 cm absorption signal is most easily interpreted, setting strong limits on the heating rate density of the universe with a measurement of its redshift alone, independent of the ionization history or details of the Ly? background evolution. In a companion paper, we extend these results, focusing on the confidence with which one can infer source emissivities from IGM properties.

Mirocha, Jordan; Harker, Geraint J. A.; Burns, Jack O., E-mail: jordan.mirocha@colorado.edu [Center for Astrophysics and Space Astronomy, University of Colorado, Campus Box 389, Boulder, CO 80309 (United States)

2013-11-10T23:59:59.000Z

305

Global patent filing strategies: an application of multi-criteria decision-making model  

Science Journals Connector (OSTI)

This paper adopts the Multi-Criteria Decision-Making (MCDM) model to study global patent filing strategies of Taiwanese companies in seven targeted countries â?? USA, China, Japan, UK, Sweden, Germany, and Taiwan. Ten criteria were identified and classified into four first tier criteria through the Analytic Hierarchy Process (AHP). The opinions of 29 experts, with engineering, marketing, and academia backgrounds, were surveyed. Patent filing of Micro Gas Turbine (MGT) technologies was selected as an exemplified case for this study. The results indicated that the USA was ranked #1 in MGT's patent filing priority, followed by Japan, Taiwan, Germany, UK, Sweden, and China. The first tier marketing consideration had the highest weight value of 40.7%, followed by legal consideration (31.5%), management consideration (18.4%), and R&D consideration (9.4%). Out of the ten second-tier evaluation criteria, patent protection and enforcement had the highest weight of 20.11%. The duration of a patent had the least weight of 4.69%. The policy implications, strategies, negotiation guidelines, and R&D investments for global patent filing were discussed.

Nien-Chu Wu; Hsiao-Cheng Yu; Tenpao Lee

2007-01-01T23:59:59.000Z

306

COLLABORATIVE RESEARCH: CONTINUOUS DYNAMIC GRID ADAPTATION IN A GLOBAL ATMOSPHERIC MODEL: APPLICATION AND REFINEMENT  

SciTech Connect (OSTI)

This project had goals of advancing the performance capabilities of the numerical general circulation model EULAG and using it to produce a fully operational atmospheric global climate model (AGCM) that can employ either static or dynamic grid stretching for targeted phenomena. The resulting AGCM combined EULAG�s advanced dynamics core with the �physics� of the NCAR Community Atmospheric Model (CAM). Effort discussed below shows how we improved model performance and tested both EULAG and the coupled CAM-EULAG in several ways to demonstrate the grid stretching and ability to simulate very well a wide range of scales, that is, multi-scale capability. We leveraged our effort through interaction with an international EULAG community that has collectively developed new features and applications of EULAG, which we exploited for our own work summarized here. Overall, the work contributed to over 40 peer- reviewed publications and over 70 conference/workshop/seminar presentations, many of them invited.

Prusa, Joseph

2012-05-08T23:59:59.000Z

307

Investigation of the cold condensation of persistent organic pollutants with a global multimedia fate model  

SciTech Connect (OSTI)

In this paper, the authors present a new global multimedia fate model that considers the influence of temperature on the environmental transport, degradation, and partitioning of persistent organic pollutants. The model consists of a variable number of latitudinal zones with specific annual temperature courses; each zone contains soil, oceanic surface water, and tropospheric air. The chemicals' degradation rates and Henry's law constants (H) are implemented as functions of temperature and the concentrations in the soil, water, and air compartments of each latitudinal zone are calculated as functions of time. The resulting temporal and spatial concentrations patterns are characterized by persistence and spatial range. Model calculations are carried out for tetrachloromethane, {alpha}-hexachlorocyclohexane ({alpha}-HCH), and murex, and the specific distribution patterns of these three chemicals are discussed. The model results show that the soil and water concentrations of the polar zones are strongly sensitive to changes of the latitudinal gradient of H and of washout ratios, adsorption to aerosol particles, and deposition rates.

Scheringer, M.; Wegmann, F.; Fenner, K.; Hungerbuehler, K.

2000-05-01T23:59:59.000Z

308

OBSERVER: An Approach for Query Processing in Global Information Systems Based on Interoperation Across Pre-Existing Ontologies  

Science Journals Connector (OSTI)

There has been an explosion in the types, availability and volume of data accessible in an information system, thanks to the World Wide Web (the Web) and related inter-networking technologies. In this environment, there is a critical need to replace ... Keywords: distributed heterogeneous data access, domain ontologies, query processing in global information systems

Eduardo Mena; Arantza Illarramendi; Vipul Kashyap; Amit P. Sheth

2000-04-01T23:59:59.000Z

309

System Advisor Model (SAM) | Open Energy Information  

Open Energy Info (EERE)

System Advisor Model (SAM) System Advisor Model (SAM) (Redirected from Solar Advisor Model) Jump to: navigation, search Tool Summary LAUNCH TOOL Name: System Advisor Model Agency/Company /Organization: National Renewable Energy Laboratory Sector: Energy Focus Area: Geothermal, Solar, - Concentrating Solar Power, - Solar Hot Water, - Solar PV, Wind Phase: Evaluate Options, Develop Goals, Prepare a Plan Topics: Pathways analysis, Resource assessment Resource Type: Case studies/examples, Dataset, Guide/manual, Training materials, Software/modeling tools, Video User Interface: Desktop Application Website: sam.nrel.gov/ Web Application Link: sam.nrel.gov/ Cost: Free OpenEI Keyword(s): Featured, EERE tool, System Advisor Model, SAM Language: English System Advisor Model Screenshot

310

Tropical cyclones in the UPSCALE ensemble of high resolution global climate models  

Science Journals Connector (OSTI)

The UPSCALE (UK on PRACE: weather-resolving Simulations of Climate for globAL Environmental risk) project, using PRACE (Partnership for Advanced Computing in Europe) resources, constructed and ran an ensemble of atmosphere-only global climate ...

Malcolm J. Roberts; Pier Luigi Vidale; Matthew S. Mizielinski; Marie-Estelle Demory; Reinhard Schiemann; Jane Strachan; Kevin Hodges; Ray Bell; Joanne Camp

311

A Robust Model Control for Dynamic Systems  

Science Journals Connector (OSTI)

Analytical methods of polynomial algebra, heuristic techniques, and digital modeling are used to study the robustness domain of linear dynamic systems with model “input–output” controllers as a function of the mutual locations of zeros ...

S. V. Tararykin; V. V. Tyutikov

2002-05-01T23:59:59.000Z

312

Global Evaluation of the ISBA-TRIP Continental Hydrological System. Part I: Comparison to GRACE Terrestrial Water Storage Estimates  

E-Print Network [OSTI]

In earth system models, the partitioning of precipitation among the variations of continental water storage climate system sim- ulated by earth system models (ESMs). The continental freshwater reservoirs represent

Ribes, Aurélien

313

Bringing Clouds into Focus: A New Global Climate Model May Reduce the  

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

Bringing Clouds into Bringing Clouds into Focus Bringing Clouds into Focus A New Global Climate Model May Reduce the Uncertainty of Climate Forecasting May 11, 2010 | Tags: Lattice QCD Contact: John Hules, JAHules@lbl.gov , +1 510 486 6008 Randall-fig4.png The large data sets generated by the GCRM require new analysis and visualization capabilities. This 3D plot of vorticity isosurfaces was developed using VisIt, a 3D visualization tool with a parallel distributed architecture, which is being extended to support the geodesic grid used by the GCRM. (Image Courtesy of the NERSC Analytics Team) Clouds exert two competing effects on the Earth's temperature: they cool the planet by reflecting solar radiation back to space, but they also warm the planet by trapping heat near the surface. These two effects coexist in

314

The Community Climate System Model Version 4  

SciTech Connect (OSTI)

The fourth version of the Community Climate System Model (CCSM4) was recently completed and released to the climate community. This paper describes developments to all the CCSM components, and documents fully coupled pre-industrial control runs compared to the previous version, CCSM3. Using the standard atmosphere and land resolution of 1{sup o} results in the sea surface temperature biases in the major upwelling regions being comparable to the 1.4{sup o} resolution CCSM3. Two changes to the deep convection scheme in the atmosphere component result in the CCSM4 producing El Nino/Southern Oscillation variability with a much more realistic frequency distribution than the CCSM3, although the amplitude is too large compared to observations. They also improve the representation of the Madden-Julian Oscillation, and the frequency distribution of tropical precipitation. A new overflow parameterization in the ocean component leads to an improved simulation of the deep ocean density structure, especially in the North Atlantic. Changes to the CCSM4 land component lead to a much improved annual cycle of water storage, especially in the tropics. The CCSM4 sea ice component uses much more realistic albedos than the CCSM3, and the Arctic sea ice concentration is improved in the CCSM4. An ensemble of 20th century simulations runs produce an excellent match to the observed September Arctic sea ice extent from 1979 to 2005. The CCSM4 ensemble mean increase in globally-averaged surface temperature between 1850 and 2005 is larger than the observed increase by about 0.4 C. This is consistent with the fact that the CCSM4 does not include a representation of the indirect effects of aerosols, although other factors may come into play. The CCSM4 still has significant biases, such as the mean precipitation distribution in the tropical Pacific Ocean, too much low cloud in the Arctic, and the latitudinal distributions of short-wave and long-wave cloud forcings.

Gent, Peter R.; Danabasoglu, Gokhan; Donner, Leo J.; Holland, Marika M.; Hunke, Elizabeth C.; Jayne, Steve R.; Lawrence, David M.; Neale, Richard; Rasch, Philip J.; Vertenstein, Mariana; Worley, Patrick; Yang, Zong-Liang; Zhang, Minghua

2011-10-01T23:59:59.000Z

315

Global analysis of river systems: from Earth system controls to Anthropocene syndromes  

Science Journals Connector (OSTI)

...centuries; and (iii) waste regulation and treatment are not applicable and long-term in situ restoration measures...Walling & Fang 2003). The long-term evolution of the river-bed...water resource and c storage security flood controln...system, although its long-term impact has not yet been...

2003-01-01T23:59:59.000Z

316

Use of global navigation satellite systems for monitoring deformations of water-development works  

SciTech Connect (OSTI)

The feasibility of using global radio-navigation satellite systems (GNSS) to improve functional safety of high-liability water-development works - dams at hydroelectric power plants, and, consequently, the safety of the population in the surrounding areas is examined on the basis of analysis of modern publications. Characteristics for determination of displacements and deformations with use of GNSS, and also in a complex with other types of measurements, are compared. It is demonstrated that combined monitoring of deformations of the ground surface of the region, and engineering and technical structures is required to ensure the functional safety of HPP, and reliable metrologic assurance of measurements is also required to obtain actual characteristics of the accuracy and effectiveness of GNSS observations.

Kaftan, V. I. [Russian Academy of Sciences, Geophysical Center (Russian Federation); Ustinov, A. V. [JSC Institut Gidropreoekt (Russian Federation)

2013-05-15T23:59:59.000Z

317

EMF24 Global Scenario Modeler Presentation Insights from the IMACLIM model  

E-Print Network [OSTI]

are approached � Decreasing GDP losses per unit of tax increase (tax revenues returned Agricolture Energy Transport Dynamic sub-modules (reduced forms of BU models) Sta3c Hybrid matrixes in values, energy and « physical » content � Secure

Boyer, Edmond

318

A size-structured food-web model for the global ocean*  

E-Print Network [OSTI]

for Global Change Science (CGCS) and the Center for Energy and Environmental Policy Research (CEEPR of global environment and energy challenges, thereby contributing to informed debate about climate change reproduces global distributions of nutrients, biomass, and primary productivity, and captures the power

319

Enhancements to Generic Disposal System Modeling Capabilities...  

Broader source: Energy.gov (indexed) [DOE]

disposal system modeling and analysis capability that takes advantage of high-performance computing (HPC) environments to simulate the important multi-physics phenomena and...

320

Topology-Based Vehicle Systems Modelling.  

E-Print Network [OSTI]

??The simulation tools that are used to model vehicle systems have not been advancing as quickly as the growth of research and technology surrounding the… (more)

Yam, Edward

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "global system modeling" 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

Nuclear Systems Modeling, Simulation & Validation | Nuclear Science...  

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

Research Areas Fuel Cycle Science & Technology Fusion Nuclear Science Isotope Development and Production Nuclear Security Science & Technology Nuclear Systems Modeling, Simulation...

322

Modeling System Development for the Evaluation of Dynamic Air Quality  

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

Modeling System Development for the Evaluation of Dynamic Air Quality Modeling System Development for the Evaluation of Dynamic Air Quality Impacts of DER Speaker(s): Robert Van Buskirk Date: January 30, 2003 - 12:00pm Location: Bldg. 90 Seminar Host/Point of Contact: Kristina LaCommare A critical challenge for the atmospheric sciences is to understand the anthropogenic impacts on atmospheric chemistry over spatial scales ranging from the urban to the regional, and ultimately to the global, and over corresponding time scales ranging from minutes to weeks and ultimately annual trends. A similar challenge for energy policymakers is to integrate an understanding of impact dynamics into the economic dynamics of energy supply and demand. The challenges of dynamic analysis of emissions impacts from the energy sector have substantially increased with a new

323

Modeling turbo-expander systems  

Science Journals Connector (OSTI)

Turbo-expander systems have long been used instead of regulators, but they have recently received attention as a driving medium for power electrical generators. These systems typically replace the regulator valves that reduce the gas pressure in gas ... Keywords: dispersed generation, turbo-expander systems, variable nozzle angle

Mehdi Taleshian Jelodar; Hasan Rastegar; Hossein Askarian Abyaneh

2013-02-01T23:59:59.000Z

324

System Advisor Model (SAM) | Open Energy Information  

Open Energy Info (EERE)

System Advisor Model (SAM) System Advisor Model (SAM) (Redirected from SAM) Jump to: navigation, search Tool Summary LAUNCH TOOL Name: System Advisor Model Agency/Company /Organization: National Renewable Energy Laboratory Sector: Energy Focus Area: Geothermal, Solar, - Concentrating Solar Power, - Solar Hot Water, - Solar PV, Wind Phase: Evaluate Options, Develop Goals, Prepare a Plan Topics: Pathways analysis, Resource assessment Resource Type: Case studies/examples, Dataset, Guide/manual, Training materials, Software/modeling tools, Video User Interface: Desktop Application Website: sam.nrel.gov/ Web Application Link: sam.nrel.gov/ Cost: Free OpenEI Keyword(s): Featured, EERE tool, System Advisor Model, SAM Language: English System Advisor Model Screenshot References: SAM[1]

325

Preliminary Concept of Operations for a Global Cylinder Identification and Monitoring System  

SciTech Connect (OSTI)

This report describes a preliminary concept of operations for a Global Cylinder Identification and Monitoring System that could improve the efficiency of the International Atomic Energy Agency (IAEA) in conducting its current inspection activities and could provide a capability to substantially increase its ability to detect credible diversion scenarios and undeclared production pathways involving UF6 cylinders. There exist concerns that a proliferant State with access to enrichment technology could obtain a cylinder containing natural or low-enriched uranium hexafluoride (UF6) and produce a significant quantity (SQ)1 of highly enriched uranium in as little as 30 days. The National Nuclear Security Administration (NNSA) through the Next Generation Safeguards Initiative sponsored a multi-laboratory team to develop an integrated system that provides for detecting scenarios involving 1) diverting an entire declared cylinder for enrichment at a clandestine facility, 2) misusing a declared cylinder at a safeguarded facility, and 3) using an undeclared cylinder at a safeguarded facility. An important objective in developing this integrated system was to improve the timeliness for detecting the cylinder diversion and undeclared production scenarios. Developing this preliminary concept required in-depth analyses of current operational and safeguards practices at conversion, enrichment, and fuel fabrication facilities. The analyses evaluated the processing, movement, and storage of cylinders at the facilities; the movement of cylinders between facilities (including cylinder fabrication); and the misuse of safeguarded facilities.

Whitaker, J. M. [ORNL; White-Horton, J. L. [ORNL; Morgan, J. B. [InSolves Associates

2013-08-01T23:59:59.000Z

326

Very Large System Dynamics Models - Lessons Learned  

SciTech Connect (OSTI)

This paper provides lessons learned from developing several large system dynamics (SD) models. System dynamics modeling practice emphasize the need to keep models small so that they are manageable and understandable. This practice is generally reasonable and prudent; however, there are times that large SD models are necessary. This paper outlines two large SD projects that were done at two Department of Energy National Laboratories, the Idaho National Laboratory and Sandia National Laboratories. This paper summarizes the models and then discusses some of the valuable lessons learned during these two modeling efforts.

Jacob J. Jacobson; Leonard Malczynski

2008-10-01T23:59:59.000Z

327

Generic Model Host System Design  

SciTech Connect (OSTI)

There are many simulation codes for accelerator modelling; each one has some strength but not all. A platform which can host multiple modelling tools would be ideal for various purposes. The model platform along with infrastructure support can be used not only for online applications but also for offline purposes. Collaboration is formed for the effort of providing such a platform. In order to achieve such a platform, a set of common physics data structure has to be set. Application Programming Interface (API) for physics applications should also be defined within a model data provider. A preliminary platform design and prototype is discussed.

Chu, Chungming; /SLAC; Wu, Juhao; /SLAC; Qiang, Ji; /LBL, Berkeley; Shen, Guobao; /Brookhaven

2012-06-22T23:59:59.000Z

328

Climate response to tropical cyclone-induced ocean mixing in an1 Earth system model of intermediate complexity2  

E-Print Network [OSTI]

Climate response to tropical cyclone-induced ocean mixing in an1 Earth system model of intermediate system model of intermediate complexity. The parameterization is based on21 previously published global. Abstract19 We introduce a parameterization of ocean mixing by tropical cyclones (TCs) into20 an Earth

329

Field location & marking of no-passing zones due to vertical alignments using the global positioning system  

E-Print Network [OSTI]

alternatives need to be developed for the safe, accurate, and efficient location of no- passing zones on two-lane roadways. This thesis addresses the use of Global Positioning System (GPS) coordinates to evaluate sight distance along the vertical profile... of roadways to provide an alternative for an automated no-passing zone location system. A system was developed that processes GPS coordinates and converts them into easting and northing values, smoothes inaccurate vertical elevation data, and evaluates...

Williams, Cameron Lee

2008-10-10T23:59:59.000Z

330

A modified Ising model for the thermodynamic properties of local and global protein folding-unfolding observed by circular dichroism and small-angle X-ray scattering  

Science Journals Connector (OSTI)

The application of a modified Ising model for the thermodynamic properties of local and global protein folding-unfolding is described.

Shiu, Y.-J.

2007-02-17T23:59:59.000Z

331

System Advisor Model: Flat Plate Photovoltaic Performance Modeling Validation Report  

SciTech Connect (OSTI)

The System Advisor Model (SAM) is a free software tool that performs detailed analysis of both system performance and system financing for a variety of renewable energy technologies. This report provides detailed validation of the SAM flat plate photovoltaic performance model by comparing SAM-modeled PV system generation data to actual measured production data for nine PV systems ranging from 75 kW to greater than 25 MW in size. The results show strong agreement between SAM predictions and field data, with annualized prediction error below 3% for all fixed tilt cases and below 8% for all one axis tracked cases. The analysis concludes that snow cover and system outages are the primary sources of disagreement, and other deviations resulting from seasonal biases in the irradiation models and one axis tracking issues are discussed in detail.

Freeman, J.; Whitmore, J.; Kaffine, L.; Blair, N.; Dobos, A. P.

2013-12-01T23:59:59.000Z

332

Modeling Control Mechanisms with Normative Multiagent Systems  

E-Print Network [OSTI]

. This paper is about control mechanisms for virtual organizations. As a case study, we discuss the Renewables of renewable energy. We apply a conceptual model based on normative multiagent systems (NMAS). We proposeModeling Control Mechanisms with Normative Multiagent Systems: the Case of the Renewables

van der Torre, Leon

333

Photosynthesis-dependent isoprene emission from leaf to planet in a global carbon-chemistry-climate model  

SciTech Connect (OSTI)

We describe the implementation of a biochemical model of isoprene emission that depends on the electron requirement for isoprene synthesis into the Farquhar/Ball- Berry leaf model of photosynthesis and stomatal conductance that is embedded within a global chemistry-climate simulation framework. The isoprene production is calculated as a function of electron transport-limited photosynthesis, intercellular carbon dioxide concentration, and canopy temperature. The vegetation biophysics module computes the photosynthetic uptake of carbon dioxide coupled with the transpiration of water vapor and the isoprene emission rate at the 30 min physical integration time step of the global chemistry-climate model. In the model, the rate of carbon assimilation provides the dominant control on isoprene emission variability over canopy temperature. A control simulation representative of the present day climatic state that uses plant functional types (PFTs), prescribed phenology and generic PFT-specific isoprene emission potentials (fraction of electrons available for isoprene synthesis) reproduces 50% of the variability across different ecosystems and seasons in a global database of measured campaign-average fluxes. Compared to time-varying isoprene flux measurements at select sites, the model authentically captures the observed variability in the 30 min average diurnal cycle (R2 = 64-96 %) and simulates the flux magnitude to within a factor of 2. The control run yields a global isoprene source strength of 451 TgCyr?1 that increases by 30% in the artificial absence of plant water stress and by 55% for potential natural vegetation.

Unger, N.; Harper, K.; Zheng, Y.; Kiang, N. Y.; Aleinov, I.; Arneth, Almut; Schurgers, G.; Amelynck, C.; Goldstein, Allen H.; Guenther, Alex B.; Heinesch, B.; Hewitt, C. N.; Karl, T.; Laffineur, Q.; Langford, B.; McKinney, Karena A.; Misztal, P.; Potosnak, M.; Rinne, J.; Pressley, S.; Schoon, N.; Serca, D.

2013-10-22T23:59:59.000Z

334

Global distribution and climate forcing of marine organic aerosol: 1. Model improvements and evaluation  

SciTech Connect (OSTI)

Marine organic aerosol emissions have been implemented and evaluated within the National Center of Atmospheric Research (NCAR)'s Community Atmosphere Model (CAM5) with the Pacific Northwest National Laboratory's 7-mode Modal Aerosol Module (MAM-7). Emissions of marine primary organic aerosols (POA), phytoplanktonproduced isoprene- and monoterpenes-derived secondary organic aerosols (SOA) and methane sulfonate (MS{sup -}) are shown to affect surface concentrations of organic aerosols in remote marine regions. Global emissions of submicron marine POA is estimated to be 7.9 and 9.4 Tg yr{sup -1}, for the Gantt et al. (2011) and Vignati et al. (2010) emission parameterizations, respectively. Marine sources of SOA and particulate MS{sup -} (containing both sulfur and carbon atoms) contribute an additional 0.2 and 5.1 Tg yr{sup -1}, respectively. Widespread areas over productive waters of the Northern Atlantic, Northern Pacific, and the Southern Ocean show marine-source submicron organic aerosol surface concentrations of 100 ngm{sup -3}, with values up to 400 ngm{sup -3} over biologically productive areas. Comparison of long-term surface observations of water insoluble organic matter (WIOM) with POA concentrations from the two emission parameterizations shows that despite revealed discrepancies (often more than a factor of 2), both Gantt et al. (2011) and Vignati et al. (2010) formulations are able to capture the magnitude of marine organic aerosol concentrations, with the Gantt et al. (2011) parameterization attaining better seasonality. Model simulations show that the mixing state of the marine POA can impact the surface number concentration of cloud condensation nuclei (CCN). The largest increases (up to 20 %) in CCN (at a supersaturation (S) of 0.2 %) number concentration are obtained over biologically productive ocean waters when marine organic aerosol is assumed to be externally mixed with sea-salt. Assuming marine organics are internally-mixed with sea-salt provides diverse results with increases and decreases in the concentration of CCN over different parts of the ocean. The sign of the CCN change due to the addition of marine organics to seasalt aerosol is determined by the relative significance of the increase in mean modal diameter due to addition of mass, and the decrease in particle hygroscopicity due to compositional changes in marine aerosol. Based on emerging evidence for increased CCN concentration over biologically active surface ocean areas/periods, our study suggests that treatment of sea spray in global climate models (GCMs) as an internal mixture of marine organic aerosols and sea-salt will likely lead to an underestimation in CCN number concentration.

Meskhidze, N.; Xu, J.; Gantt, Brett; Zhang, Yang; Nenes, Athanasios; Ghan, Steven J.; Liu, Xiaohong; Easter, Richard C.; Zaveri, Rahul A.

2011-11-23T23:59:59.000Z

335

19 `eme Congr`es Francais de Mecanique Marseille, 24-28 ao^ut 2009 Transition to turbulence in globally subcritical systems  

E-Print Network [OSTI]

in globally subcritical systems P. MANNEVILLEa , J. ROLLANDa,b a. LadHyX, ´Ecole Polytechnique, 91128 our current understanding of the transition to turbulence in globally subcritical systems, pointing to turbulence, subcritical systems, plane Couette flow 1 General setting Understanding the transition

Boyer, Edmond

336

Feasibility of integrating other federal information systems into the Global Network of Environment and Technology, GNET{reg_sign}  

SciTech Connect (OSTI)

The Global Environment and Technology Enterprise (GETE) of the Global Environment and Technology Foundation (GETF) has been tasked by the US Department of Energy`s (DOE), Federal Energy Technology Center (FETC) to assist in reducing DOE`s cost for the Global Network of Environment and Technology (GNET{reg_sign}). As part of this task, GETE is seeking federal partners to invest in GNET{reg_sign}. The authors are also seeking FETC`s commitment to serve as GNET`s federal agency champion promoting the system to potential agency partners. This report assesses the benefits of partnering with GNET{reg_sign} and provides recommendations for identifying and integrating other federally funded (non-DOE) environmental information management systems into GNET{reg_sign}.

NONE

1998-05-01T23:59:59.000Z

337

Modeling of shippingModeling of shipping NONOxx emissions in globalemissions in global GeertGeert VinkenVinken11,, FolkertFolkert BoersmaBoersma22, and Daniel J. Jacob, and Daniel J. Jacob33  

E-Print Network [OSTI]

Modeling of shippingModeling of shipping NONOxx emissions in globalemissions in global CTMs) emissions 5-7% of global sulfur dioxide (SO2) emissions 3-4% of global carbon dioxide (CO2) emissions Ship 70% of the ship emissions occur within 400 km of land Only industrial sector not regulated under

Haak, Hein

338

U.K. HiGEM: The New U.K. High-Resolution Global Environment Model--Model Description and Basic Evaluation  

E-Print Network [OSTI]

, Earth Simulator Centre, Yokohama, Japan @ Met Office Hadley Centre for Climate Prediction and Research Unified Model, known as the Hadley Centre Global Environmental Model, version 1 (HadGEM1). In Hi Office Hadley Centre. Its aim is to extend the latest climate configuration of the Met Office Hadley

Stevens, David

339

On the Use of an Adaptive, Hybrid-Isentropic Vertical Coordinate in Global Atmospheric Modeling  

Science Journals Connector (OSTI)

This article is one in a series describing the functionality of the Flow-Following, Finite-Volume Icosahedral Model (FIM) developed at NOAA’s Earth System Research Laboratory. Emphasis in this article is on the design of the vertical coordinate—...

Rainer Bleck; Stan Benjamin; Jin Lee; Alexander E. MacDonald

2010-06-01T23:59:59.000Z

340

Modeling of Residential Buildings and Heating Systems  

E-Print Network [OSTI]

-zone building model is used in each case. A model of the heating system is also used for the multi-storey building. Both co-heating and tracer gas measurements are used in order to adjust the parameters of each building model. A complete monitoring...

Masy, G.; Lebrun, J.

2004-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "global system modeling" 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

Reference Modeling for Inter-organizational Systems  

E-Print Network [OSTI]

to gain efficiency in the modeling process and a higher quality of inter-organizational solutions. 1Reference Modeling for Inter-organizational Systems Dieter Mayrhofer Institute of Software@big.tuwien.ac.at Abstract. Inter-organizational business process models are created and used by different partner networks

342

Prerequisites: Control Systems I+II, System Modeling, Engine Class (Introduction to Modeling and Control of  

E-Print Network [OSTI]

Thesis IDSC-LG-FZ-05 Gas Diesel Engine Modeling and Control The gas diesel engine is a natural gas enginePrerequisites: Control Systems I+II, System Modeling, Engine Class (Introduction to Modeling and Control of Internal Combustion Engine Systems, IC Engines, ...), Optimization Course, Matlab

Lygeros, John

343

Human performance modeling for system of systems analytics.  

SciTech Connect (OSTI)

A Laboratory-Directed Research and Development project was initiated in 2005 to investigate Human Performance Modeling in a System of Systems analytic environment. SAND2006-6569 and SAND2006-7911 document interim results from this effort; this report documents the final results. The problem is difficult because of the number of humans involved in a System of Systems environment and the generally poorly defined nature of the tasks that each human must perform. A two-pronged strategy was followed: one prong was to develop human models using a probability-based method similar to that first developed for relatively well-understood probability based performance modeling; another prong was to investigate more state-of-art human cognition models. The probability-based modeling resulted in a comprehensive addition of human-modeling capability to the existing SoSAT computer program. The cognitive modeling resulted in an increased understanding of what is necessary to incorporate cognition-based models to a System of Systems analytic environment.

Dixon, Kevin R.; Lawton, Craig R.; Basilico, Justin Derrick; Longsine, Dennis E. (INTERA, Inc., Austin, TX); Forsythe, James Chris; Gauthier, John Henry; Le, Hai D.

2008-10-01T23:59:59.000Z

344

Logistics systems modeling and simulation  

Science Journals Connector (OSTI)

Modern logistics systems are much more than simply networks of material flow. They involve collaboration between firms that are also competitors. The supply chain can be a key consideration in product design, with its design and operations influenced ...

George Thiers; Leon McGinnis

2011-12-01T23:59:59.000Z

345

MODEL ADAPTATION FOR HYPERBOLIC SYSTEMS WITH RELAXATION  

E-Print Network [OSTI]

MODEL ADAPTATION FOR HYPERBOLIC SYSTEMS WITH RELAXATION H. MATHIS, C. CANC`ES, E. GODLEWSKI, N the phenomenon under consideration. We focus in this work on general hyperbolic systems with stiff relaxation source terms together with the corre- sponding hyperbolic equilibrium systems. The goal is to determine

Paris-Sud XI, Université de

346

Research Statement of Hamsa Balakrishnan The air transportation system is a complex, global system that transports over 2.1 billion  

E-Print Network [OSTI]

is important because of the high costs of delays and pollution today, as well as the projected doubling in airResearch Statement of Hamsa Balakrishnan The air transportation system is a complex, global system that transports over 2.1 billion passengers each year. Air traffic delays have become a huge problem

Gummadi, Ramakrishna

347

Research Statement of Hamsa Balakrishnan The air transportation system is a large, complex, global system that transports over 2.1 billion  

E-Print Network [OSTI]

Research Statement of Hamsa Balakrishnan The air transportation system is a large, complex, global system that transports over 2.1 billion passengers each year. Air traffic delays have become a huge to the Joint Economic Committee of the US Senate, domestic air traffic delays in 2007 cost airlines over $19

348

2005: Table of EMICs (Earth System Models of Intermediate Complexity  

E-Print Network [OSTI]

apparent that Earth system modelling has to rely on a hierarchy of models in which models of intermediate

Martin Claussen

349

Global modeling of cancer gene expression signa-Cancer leads to permanent changes in cell's physiological state and various  

E-Print Network [OSTI]

Global modeling of cancer gene expression signa- tures Cancer leads to permanent changes in cell cancer types. Less is known about the underlying biological processes, or relationships between different cancer types with respect to these changes. While each specific cancer type has a set of unique

Kaski, Samuel

350

Modeling the barotropic response of the global ocean to atmospheric wind and pressure forcing -comparisons with observations  

E-Print Network [OSTI]

-G. Model outputs are compared to in situ observations with tide gauge data (TG) and bottom pressure gauge data (BPR), and also with T/P altimetric cross over points (noted CO). Intercomparisons were performed/P and Jason altimeters deliver very accurate data sets (within 2 centimeter global error for T/P). How- ever

351

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

352

An animal model for genetic/evolutionary responses to global climate change. Final report  

SciTech Connect (OSTI)

A multi-level attack was made on a molecular-genetics-based vulnerability of thermally sensitive organisms to global climate change.

Ward B. Watt

1998-02-28T23:59:59.000Z

353

COLLABORATIVE RESEARCH: CONTINUOUS DYNAMIC GRID ADAPTATION IN A GLOBAL ATMOSPHERIC MODEL: APPLICATION AND REFINEMENT  

SciTech Connect (OSTI)

This project had goals of advancing the performance capabilities of the numerical general circulation model EULAG and using it to produce a fully operational atmospheric global climate model (AGCM) that can employ either static or dynamic grid stretching for targeted phenomena. The resulting AGCM combined EULAG's advanced dynamics core with the "physics" of the NCAR Community Atmospheric Model (CAM). Effort discussed below shows how we improved model performance and tested both EULAG and the coupled CAM-EULAG in several ways to demonstrate the grid stretching and ability to simulate very well a wide range of scales, that is, multi-scale capability. We leveraged our effort through interaction with an international EULAG community that has collectively developed new features and applications of EULAG, which we exploited for our own work summarized here. Overall, the work contributed to over 40 peer-reviewed publications and over 70 conference/workshop/seminar presentations, many of them invited. 3a. EULAG Advances EULAG is a non-hydrostatic, parallel computational model for all-scale geophysical flows. EULAG's name derives from its two computational options: EULerian (flux form) or semi-LAGrangian (advective form). The model combines nonoscillatory forward-in-time (NFT) numerical algorithms with a robust elliptic Krylov solver. A signature feature of EULAG is that it is formulated in generalized time-dependent curvilinear coordinates. In particular, this enables grid adaptivity. In total, these features give EULAG novel advantages over many existing dynamical cores. For EULAG itself, numerical advances included refining boundary conditions and filters for optimizing model performance in polar regions. We also added flexibility to the model's underlying formulation, allowing it to work with the pseudo-compressible equation set of Durran in addition to EULAG's standard anelastic formulation. Work in collaboration with others also extended the demonstrated range of validity of soundproof models, showing that they are more broadly applicable than some had previously thought. Substantial testing of EULAG included application and extension of the Jablonowski-Williamson baroclinic wave test - an archetype of planetary weather - and further analysis of multi-scale interactions arising from collapse of temperature fronts in both the baroclinic wave test and simulations of the Held-Suarez idealized climate. These analyses revealed properties of atmospheric gravity waves not seen in previous work and further demonstrated the ability of EULAG to simulate realistic behavior over several orders of magnitude of length scales. Additional collaborative work enhanced capability for modeling atmospheric flows with adaptive moving meshes and demonstrated the ability of EULAG to move into petascale computing. 3b. CAM-EULAG Advances We have developed CAM-EULAG in collaboration with former project postdoc, now University of Cape Town Assistant Professor, Babatunde Abiodun. Initial study documented good model performance in aqua-planet simulations. In particular, we showed that the grid adaptivity (stretching) implemented in CAM-EULAG allows higher resolution in selected regions without causing anomalous behavior such as spurious wave reflection. We then used the stretched-grid version to analyze simulated extreme precipitation events in West Africa, comparing the precipitation and event environment with observed behavior. The model simulates fairly well the spatial scale and the interannual and intraseasonal variability of the extreme events, although its extreme precipitation intensity is weaker than observed. In addition, both observations and the simulations show possible forcing of extreme events by African easterly waves. 3c. Other Contributions Through our collaborations, we have made contributions to a wide range of outcomes. For research focused on terrestrial behavior, these have included (1) upwind schemes for gas dynamics, (2) a nonlinear perspective on the dynamics of the Madden-Julian Oscillation, (3) numerical realism of thermal co

Gutowski, William J.; Prusa, Joseph M.; Smolarkiewicz, Piotr K.

2012-05-08T23:59:59.000Z

354

Economical ontological models for discrete quantum systems  

Science Journals Connector (OSTI)

I use the recently proposed framework of ontological models (N. Harrigan, T. Rudolph, and S. Aaronson, e-print arXiv:0709.1149) to obtain economical models for the results of tomographically complete sets of measurements on finite-dimensional quantum systems. I describe a procedure that simplifies the models by decreasing the number of necessary ontic states and present an explicit model with just 33 ontic states for a qutrit.

Ernesto F. Galvão

2009-08-05T23:59:59.000Z

355

Economical ontological models for discrete quantum systems  

E-Print Network [OSTI]

I use the recently proposed framework of ontological models [Harrigan et al., arXiv:0709.1149v2] to obtain economical models for results of tomographically complete sets of measurements on finite-dimensional quantum systems. I describe a procedure that simplifies the models by decreasing the number of necessary ontic states, and present an explicit model with just 33 ontic states for a qutrit.

Ernesto F. Galvao

2009-02-13T23:59:59.000Z

356

SALSA3D : a global 3D p-velocity model of the Earth's crust and mantle for improved event location.  

SciTech Connect (OSTI)

To test the hypothesis that high quality 3D Earth models will produce seismic event locations which are more accurate and more precise, we are developing a global 3D P wave velocity model of the Earth's crust and mantle using seismic tomography. In this paper, we present the most recent version of our model, SALSA3D version 1.5, and demonstrate its ability to reduce mislocations for a large set of realizations derived from a carefully chosen set of globally-distributed ground truth events. Our model is derived from the latest version of the Ground Truth (GT) catalog of P and Pn travel time picks assembled by Los Alamos National Laboratory. To prevent over-weighting due to ray path redundancy and to reduce the computational burden, we cluster rays to produce representative rays. Reduction in the total number of ray paths is {approx}50%. The model is represented using the triangular tessellation system described by Ballard et al. (2009), which incorporates variable resolution in both the geographic and radial dimensions. For our starting model, we use a simplified two layer crustal model derived from the Crust 2.0 model over a uniform AK135 mantle. Sufficient damping is used to reduce velocity adjustments so that ray path changes between iterations are small. We obtain proper model smoothness by using progressive grid refinement, refining the grid only around areas with significant velocity changes from the starting model. At each grid refinement level except the last one we limit the number of iterations to prevent convergence thereby preserving aspects of broad features resolved at coarser resolutions. Our approach produces a smooth, multi-resolution model with node density appropriate to both ray coverage and the velocity gradients required by the data. This scheme is computationally expensive, so we use a distributed computing framework based on the Java Parallel Processing Framework, providing us with {approx}400 processors. Resolution of our model is assessed using a variation of the standard checkerboard method. We compare the travel-time prediction and location capabilities of SALSA3D to standard 1D models via location tests on a global event set with GT of 5 km or better. These events generally possess hundreds of Pn and P picks from which we generate different realizations of station distributions, yielding a range of azimuthal coverage and ratios of teleseismic to regional arrivals, with which we test the robustness and quality of relocation. The SALSA3D model reduces mislocation over standard 1D ak135 regardless of Pn to P ratio, with the improvement being most pronounced at higher azimuthal gaps.

Encarnacao, Andre Villanova; Begnaud, Michael A. (Los Alamos National Laboratories); Rowe, Charlotte A. (Los Alamos National Laboratories); Young, Christopher John; Chang, Marcus C.; Ballard, Sally C.; Hipp, James Richard

2010-06-01T23:59:59.000Z

357

A global 3D P-velocity model of the Earth's crust and mantle for improved event location : SALSA3D.  

SciTech Connect (OSTI)

To test the hypothesis that high quality 3D Earth models will produce seismic event locations which are more accurate and more precise, we are developing a global 3D P wave velocity model of the Earth's crust and mantle using seismic tomography. In this paper, we present the most recent version of our model, SALSA3D version 1.5, and demonstrate its ability to reduce mislocations for a large set of realizations derived from a carefully chosen set of globally-distributed ground truth events. Our model is derived from the latest version of the Ground Truth (GT) catalog of P and Pn travel time picks assembled by Los Alamos National Laboratory. To prevent over-weighting due to ray path redundancy and to reduce the computational burden, we cluster rays to produce representative rays. Reduction in the total number of ray paths is {approx}50%. The model is represented using the triangular tessellation system described by Ballard et al. (2009), which incorporates variable resolution in both the geographic and radial dimensions. For our starting model, we use a simplified two layer crustal model derived from the Crust 2.0 model over a uniform AK135 mantle. Sufficient damping is used to reduce velocity adjustments so that ray path changes between iterations are small. We obtain proper model smoothness by using progressive grid refinement, refining the grid only around areas with significant velocity changes from the starting model. At each grid refinement level except the last one we limit the number of iterations to prevent convergence thereby preserving aspects of broad features resolved at coarser resolutions. Our approach produces a smooth, multi-resolution model with node density appropriate to both ray coverage and the velocity gradients required by the data. This scheme is computationally expensive, so we use a distributed computing framework based on the Java Parallel Processing Framework, providing us with {approx}400 processors. Resolution of our model is assessed using a variation of the standard checkerboard method. We compare the travel-time prediction and location capabilities of SALSA3D to standard 1D models via location tests on a global event set with GT of 5 km or better. These events generally possess hundreds of Pn and P picks from which we generate different realizations of station distributions, yielding a range of azimuthal coverage and ratios of teleseismic to regional arrivals, with which we test the robustness and quality of relocation. The SALSA3D model reduces mislocation over standard 1D ak135 regardless of Pn to P ratio, with the improvement being most pronounced at higher azimuthal gaps.

Young, Christopher John; Steck, Lee K. (Los Alamos National Laboratory); Phillips, William Scott (Los Alamos National Laboratory); Ballard, Sanford; Chang, Marcus C.; Rowe, Charlotte A. (Los Alamos National Laboratory); Encarnacao, Andre Villanova; Begnaud, Michael A. (Los Alamos National Laboratory); Hipp, James Richard

2010-07-01T23:59:59.000Z

358

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

359

Global Evaluation of the ISBA-TRIP Continental Hydrological System. Part II: Uncertainties in River Routing Simulation Related to Flow  

E-Print Network [OSTI]

the entire globe. RRMs have been introduced into earth system models (ESMs) to convert the runoff simulated

Boyer, Edmond

360

A Physically Based Runoff Routing Model for Land Surface and Earth System Models  

Science Journals Connector (OSTI)

A new physically based runoff routing model, called the Model for Scale Adaptive River Transport (MOSART), has been developed to be applicable across local, regional, and global scales. Within each spatial unit, surface runoff is first routed ...

Hongyi Li; Mark S. Wigmosta; Huan Wu; Maoyi Huang; Yinghai Ke; André M. Coleman; L. Ruby Leung

2013-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "global system modeling" 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

A scalable methodology for modeling cities as systems of systems  

E-Print Network [OSTI]

As cities evolve in size and complexity, their component systems become more interconnected. Comprehensive modeling and simulation is needed to capture interactions and correctly assess the impact of changes. This thesis ...

Wachtel, Amanda M. (Amanda Marie)

2013-01-01T23:59:59.000Z

362

Planetary boundary layer depth in Global climate models induced biases in surface climatology  

E-Print Network [OSTI]

The Earth has warmed in the last century with the most rapid warming occurring near the surface in the arctic. This enhanced surface warming in the Arctic is partly because the extra heat is trapped in a thin layer of air near the surface due to the persistent stable-stratification found in this region. The warming of the surface air due to the extra heat depends upon the amount of turbulent mixing in the atmosphere, which is described by the depth of the atmospheric boundary layer (ABL). In this way the depth of the ABL determines the effective response of the surface air temperature to perturbations in the climate forcing. The ABL depth can vary from tens of meters to a few kilometers which presents a challenge for global climate models which cannot resolve the shallower layers. Here we show that the uncertainties in the depth of the ABL can explain up to 60 percent of the difference between the simulated and observed surface air temperature trends and 50 percent of the difference in temperature variability...

Davy, Richard

2014-01-01T23:59:59.000Z

363

Maui Electrical System Model Development  

E-Print Network [OSTI]

1 2. Simulation Data and Assumptions 1 2.1 Economic Data and Assumptions 1 2.1.1 Thermal Plants 1 2 in the preliminary results presentation on June 16th, are summarized in this section. 2.1.1 Thermal Plants of the power plant FUEL_TYPE OIL-Distillate Oil (No.2); RENEW - zero cost fuel used for modeling Wind & Geoth

364

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.

365

Global Warming, endogenous risk and irreversibility  

E-Print Network [OSTI]

The economics of global warming, Institute for InternationalEconomic Models of Global Warming, Cambridge, Mass. MITstochastic losses from global warming, Risk Analysis 16(2):

Fisher, Anthony C.; Narain, Urvashi

2002-01-01T23:59:59.000Z

366

CTBT integrated verification system evaluation model supplement  

SciTech Connect (OSTI)

Sandia National Laboratories has developed a computer based model called IVSEM (Integrated Verification System Evaluation Model) to estimate the performance of a nuclear detonation monitoring system. The IVSEM project was initiated in June 1994, by Sandia's Monitoring Systems and Technology Center and has been funded by the U.S. Department of Energy's Office of Nonproliferation and National Security (DOE/NN). IVSEM is a simple, ''top-level,'' modeling tool which estimates the performance of a Comprehensive Nuclear Test Ban Treaty (CTBT) monitoring system and can help explore the impact of various sensor system concepts and technology advancements on CTBT monitoring. One of IVSEM's unique features is that it integrates results from the various CTBT sensor technologies (seismic, in sound, radionuclide, and hydroacoustic) and allows the user to investigate synergy among the technologies. Specifically, IVSEM estimates the detection effectiveness (probability of detection), location accuracy, and identification capability of the integrated system and of each technology subsystem individually. The model attempts to accurately estimate the monitoring system's performance at medium interfaces (air-land, air-water) and for some evasive testing methods such as seismic decoupling. The original IVSEM report, CTBT Integrated Verification System Evaluation Model, SAND97-25 18, described version 1.2 of IVSEM. This report describes the changes made to IVSEM version 1.2 and the addition of identification capability estimates that have been incorporated into IVSEM version 2.0.

EDENBURN,MICHAEL W.; BUNTING,MARCUS; PAYNE JR.,ARTHUR C.; TROST,LAWRENCE C.

2000-03-02T23:59:59.000Z

367

Implications of global warming for the climate of African rainforests  

Science Journals Connector (OSTI)

...Amazonia, but not in the Congo Basin. The newest generation of global model experiments (CMIP5) includes several Earth System Models with dynamic vegetation, and existing research has largely found projections from CMIP5 to be similar to CMIP3...

2013-01-01T23:59:59.000Z

368

A feature model of coupling technologies for Earth System Models  

Science Journals Connector (OSTI)

Couplers that link together two or more numerical simulations are well-known abstractions in the Earth System Modeling (ESM) community. In the past decade, reusable software assets have emerged to facilitate scientists in implementing couplers. While ... Keywords: Climate model, Code generation, Coupler, Feature analysis, Software architecture

Rocky Dunlap; Spencer Rugaber; Leo Mark

2013-04-01T23:59:59.000Z

369

Reduced-Order Model Design for Nonlinear Smart System Models  

E-Print Network [OSTI]

nonlinear smart material system models can yield full-order numerical models that accurately characterize: Smart materials, proper orthogonal decomposition 1. Introduction Proper Orthogonal Decomposition (POD those seeking to implement real-time control on smart material structures (see [1] and the references

370

Mapping Tomorrow's Resources: A symposium on the uses of remote sensing, Geographic Information Systems (GIS), and Global Positioning Systems (GPS) for natural resources management  

SciTech Connect (OSTI)

The College of Natural Resources recognizes the important role it has in educating natural resources managers and leaders who can provide the guidance and knowledge needed to increase the production of the earth's renewable resources while sustaining and enhancing the global environment and the natural resource base. The College's teaching, research, extension, and service efforts focus on the many aspects of sustained multiple-natural-resources management and their relationship to man. Through its many programs, the College of Natural Resources focuses on solving local, state, national, and global problems to enhance a more efficient and contemporary use of the world's natural resources. Natural Resources and Environmental Issues (NREI) which began publication in 1993, is a technical series that addresses current topics relevant to natural resources and to the environment. The journal is published as a series of volumes, with at least one being issued each year as the proceedings of the Natural Resources Week Symposium. In the issue on Mapping Tommorrow's Resources, the following topics are discussed: Natural Resource Information from Monopoly to Competition; Global Resources and Mission to Planet Earth; Geographic Information Systems (GIS) Systems and Data Management for Global Data Sets in Natural Resources; the Global Resource Information Database; Overview of GIS Technology in Utah State Government; Politically Correct Global Mapping and Monitoring; Integrating Satellite Imagery and GIS into Natural Resources Management; Forest Service Applications of Remote Sensing and the National Training Program; the Position of the Global Positioning System (GPS) in Wildlife and Habitat Mapping; and the Bureau of Land Management's (BLM's) Remote Sensing Program in Utah.

Falconer, A.

1993-01-01T23:59:59.000Z

371

Duke, R. D. and Kammen, D. M. (2003) "Energy for Development: Solar Home Systems in Africa and Global Carbon Emissions", Climate Change for Africa: Science,  

E-Print Network [OSTI]

Duke, R. D. and Kammen, D. M. (2003) "Energy for Development: Solar Home Systems in Africa and Global Carbon Emissions", Climate Change for Africa: Science, Technology, Policy and Capacity Building: Solar Home Systems in Africa and Global Carbon Emissions Richard D. Duke* and Daniel M. Kammen

Kammen, Daniel M.

372

Hybrid Energy System Modeling in Modelica  

SciTech Connect (OSTI)

In this paper, a Hybrid Energy System (HES) configuration is modeled in Modelica. Hybrid Energy Systems (HES) have as their defining characteristic the use of one or more energy inputs, combined with the potential for multiple energy outputs. Compared to traditional energy systems, HES provide additional operational flexibility so that high variability in both energy production and consumption levels can be absorbed more effectively. This is particularly important when including renewable energy sources, whose output levels are inherently variable, determined by nature. The specific HES configuration modeled in this paper include two energy inputs: a nuclear plant, and a series of wind turbines. In addition, the system produces two energy outputs: electricity and synthetic fuel. The models are verified through simulations of the individual components, and the system as a whole. The simulations are performed for a range of component sizes, operating conditions, and control schemes.

William R. Binder; Christiaan J. J. Paredis; Humberto E. Garcia

2014-03-01T23:59:59.000Z

373

The development of an integrated model for assessing sustainability of complex systems  

Science Journals Connector (OSTI)

Currently, there are numerous indicators (single and composite) for measuring impacts in the three pillars, though current thinking emphasises the need for system thinking rather than the reductionist concept of pillars. Most existing indices/methods measure single aspects of sustainability and the more integrated indicators are aimed at national or global level assessments. A review of existing indicators, methods and models within the context of complex system sustainability showed that no single existing index, method or model was able to assess sustainability of complex systems. Most fail to account for complex system characteristics, such as system dynamics, interconnections and interdependencies of system components, a system's ability to learn and remember, emergence of novel behaviours, co-evolution, etc. This paper presents the methodology used to develop a new model for assessing sustainability of complex systems based on risk.

Gayathri Babarenda Gamage; Carol Boyle; Ron McDowall

2013-01-01T23:59:59.000Z

374

The National Energy Modeling System: An overview  

SciTech Connect (OSTI)

The National Energy Modeling System (NEMS) is a computer-based, energy-economy modeling system of US energy markets for the midterm period of 1990 to 2010. NEMS projects the production, imports, conversion, consumption, and prices of energy, subject to assumptions on macroeconomic and financial factors, world energy markets, resource availability and costs, behavioral and technological choice criteria, cost and performance characteristics of energy technologies, and demographics. This report presents an overview of the structure and methodology of NEMS and each of its components. The first chapter provides a description of the design and objectives of the system. The second chapter describes the modeling structure. The remainder of the report summarizes the methodology and scope of the component modules of NEMS. The model descriptions are intended for readers familiar with terminology from economics, operations research, and energy modeling. Additional background on the development of the system is provided in Appendix A of this report, which describes the EIA modeling systems that preceded NEMS. More detailed model documentation reports for all the NEMS modules are also available from EIA.

Not Available

1994-05-01T23:59:59.000Z

375

Review of modeling methods for HVAC systems  

Science Journals Connector (OSTI)

Abstract This work presents the literature review of the methods used to model the heating, ventilation, and air conditioning (HVAC) systems. The model development is necessary for the study of the energy consumption of HVAC systems. Models are also required to simulate the different supervisory and local loop control strategies to improve the energy consumption efficiency. HVAC systems have complex structures consisting of heat and mass transfer equipment such as chiller, boiler, heating/cooling coils, and supply air ducts. HVAC systems also consist of several sensors and controllers for regulating the controllable variables such as zone temperature, supply air temperature, supply air fan speed, duct static pressure, and chilled water temperature at their set-points. To predict the energy consumption by the HVAC systems accurately, one needs to model the individual components either from the measured data or based on the knowledge of the underlying physical phenomenon. This results in three broad classes of the models known as data driven, physics based, and grey box models. In this paper, major data driven, physics based, and grey box modeling techniques reported in the recent literature are reviewed.

Abdul Afram; Farrokh Janabi-Sharifi

2014-01-01T23:59:59.000Z

376

Human performance modeling for system of systems analytics :soldier fatigue.  

SciTech Connect (OSTI)

The military has identified Human Performance Modeling (HPM) as a significant requirement and challenge of future systems modeling and analysis initiatives as can be seen in the Department of Defense's (DoD) Defense Modeling and Simulation Office's (DMSO) Master Plan (DoD 5000.59-P 1995). To this goal, the military is currently spending millions of dollars on programs devoted to HPM in various military contexts. Examples include the Human Performance Modeling Integration (HPMI) program within the Air Force Research Laboratory, which focuses on integrating HPMs with constructive models of systems (e.g. cockpit simulations) and the Navy's Human Performance Center (HPC) established in September 2003. Nearly all of these initiatives focus on the interface between humans and a single system. This is insufficient in the era of highly complex network centric SoS. This report presents research and development in the area of HPM in a system-of-systems (SoS). Specifically, this report addresses modeling soldier fatigue and the potential impacts soldier fatigue can have on SoS performance.

Lawton, Craig R.; Campbell, James E.; Miller, Dwight Peter

2005-10-01T23:59:59.000Z

377

A toolkit for building earth system models  

SciTech Connect (OSTI)

An earth system model is a computer code designed to simulate the interrelated processes that determine the earth's weather and climate, such as atmospheric circulation, atmospheric physics, atmospheric chemistry, oceanic circulation, and biosphere. I propose a toolkit that would support a modular, or object-oriented, approach to the implementation of such models.

Foster, I.

1993-03-01T23:59:59.000Z

378

A toolkit for building earth system models  

SciTech Connect (OSTI)

An earth system model is a computer code designed to simulate the interrelated processes that determine the earth`s weather and climate, such as atmospheric circulation, atmospheric physics, atmospheric chemistry, oceanic circulation, and biosphere. I propose a toolkit that would support a modular, or object-oriented, approach to the implementation of such models.

Foster, I.

1993-03-01T23:59:59.000Z

379

Exactly Solvable Model for Driven Dissipative Systems  

Science Journals Connector (OSTI)

We introduce a solvable stochastic model inspired by granular gases for driven dissipative systems. We characterize far from equilibrium steady states of such systems through the non-Boltzmann energy distribution and compare different measures of effective temperatures. As an example we demonstrate that fluctuation-dissipation relations hold, however, with an effective temperature differing from the effective temperature defined from the average energy.

Yair Srebro and Dov Levine

2004-12-07T23:59:59.000Z

380

CTBT Integrated Verification System Evaluation Model  

SciTech Connect (OSTI)

Sandia National Laboratories has developed a computer based model called IVSEM (Integrated Verification System Evaluation Model) to estimate the performance of a nuclear detonation monitoring system. The IVSEM project was initiated in June 1994, by Sandia`s Monitoring Systems and Technology Center and has been funded by the US Department of Energy`s Office of Nonproliferation and National Security (DOE/NN). IVSEM is a simple, top-level, modeling tool which estimates the performance of a Comprehensive Nuclear Test Ban Treaty (CTBT) monitoring system and can help explore the impact of various sensor system concepts and technology advancements on CTBT monitoring. One of IVSEM`s unique features is that it integrates results from the various CTBT sensor technologies (seismic, infrasound, radionuclide, and hydroacoustic) and allows the user to investigate synergy among the technologies. Specifically, IVSEM estimates the detection effectiveness (probability of detection) and location accuracy of the integrated system and of each technology subsystem individually. The model attempts to accurately estimate the monitoring system`s performance at medium interfaces (air-land, air-water) and for some evasive testing methods such as seismic decoupling. This report describes version 1.2 of IVSEM.

Edenburn, M.W.; Bunting, M.L.; Payne, A.C. Jr.

1997-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "global system modeling" 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

Lidar-Measured Wind Profiles: The Missing Link in the Global Observing System  

Science Journals Connector (OSTI)

The three-dimensional global wind field is the most important remaining measurement needed to accurately assess the dynamics of the atmosphere. Wind information in the tropics, high latitudes, and stratosphere is particularly deficient. Furthermore, only ...

Wayman E. Baker; Robert Atlas; Carla Cardinali; Amy Clement; George D. Emmitt; Bruce M. Gentry; R. Michael Hardesty; Erland Källén; Michael J. Kavaya; Rolf Langland; Zaizhong Ma; Michiko Masutani; Will McCarty; R. Bradley Pierce; Zhaoxia Pu; Lars Peter Riishojgaard; James Ryan; Sara Tucker; Martin Weissmann; James G. Yoe

2014-04-01T23:59:59.000Z

382

Using a total landed cost model to foster global logistics strategy in the electronics industry  

E-Print Network [OSTI]

Global operation strategies have been widely used in the last several decades as many companies and industries have taken advantage of lower production costs. However, in choosing a location, companies often only consider ...

Jearasatit, Apichart

2010-01-01T23:59:59.000Z

383

From regional pulse vaccination to global disease eradication: insights from a mathematical model of poliomyelitis  

E-Print Network [OSTI]

Mass-vaccination campaigns are an important strategy in the global fight against poliomyelitis and measles. The large-scale logistics required for these mass immunisation campaigns magnifies the need for research into the ...

Browne, Cameron J.

384

A Fuzzy Relationship Model of FMEA for Quality Management in Global Supply Chains  

Science Journals Connector (OSTI)

In global supply chain (GSC), “agility” and continuous change are regarded as important characteristics. Dynamic alliances (DA) as a form of GSC came into being to reply to these characteristics which should be t...

Lu Gan; Can Ding

2014-01-01T23:59:59.000Z

385

Global precipitation retrieval algorithm trained for SSMIS using a numerical weather prediction model: Design and evaluation  

E-Print Network [OSTI]

This paper presents and evaluates a global precipitation retrieval algorithm for the Special Sensor Microwave Imager/Sounder (SSMIS). It is based on those developed earlier for the Advanced Microwave Sounding Unit (AMSU) ...

Surussavadee, Chinnawat

386

Moral purpose, economic incentive and global trade : why new business models are needed  

E-Print Network [OSTI]

Globalization has occurred in various forms over the past century, yet only recently has it become daily news. This evolving process has created numerous underlying tensions that are not well understood. While western ...

Samel, Hiram M

2006-01-01T23:59:59.000Z

387

Safety analysis of TCAS on Global Hawk using airspace encounter models  

E-Print Network [OSTI]

The U.S. Air Force's RQ-4 Global Hawk unmanned aerial vehicle (UAV) is a high altitude, long endurance aircraft used for surveillance and reconnaissance. Because of the potential for close proximity to manned aircraft in ...

Billingsley, Thomas B. (Thomas Boyd)

2006-01-01T23:59:59.000Z

388

Model System of Self-Reproducing Vesicles  

Science Journals Connector (OSTI)

Development of self-reproducing vesicle systems is the first step for autopoietic cycles. We established a model self-reproducing vesicle system without the membrane molecule synthesis route. The model vesicle composed of cylinder- and inverse-cone-shaped lipids formed inclusion vesicles inside the mother vesicle, and the inclusion vesicles were then expelled by a temperature cycling. By changing the vesicle composition, the mother vesicles showed a budding-type self-reproduction pathway. A key concept of this system is the coupling of the main-chain transition and the shape of lipids.

Yuka Sakuma and Masayuki Imai

2011-10-31T23:59:59.000Z

389

Global Predictions  

E-Print Network [OSTI]

created every day by the lab and used by the forest service, county commissioners and others. Using computer technology and satellites, the lab currently focuses on three core spatial technologies? GIS, global positioning systems (GPS) and remote...,? said Srinivasan. The lab also uses GPS, a satellite navigation system useful for surveying property boundaries and fields. GPS uses satellites to locate and track any feature on Earth at any given time. The lab is using GPS in identifying the Corps...

Swyden, Courtney

2006-01-01T23:59:59.000Z

390

A global 3D P-Velocity model of the Earth%3CU%2B2019%3Es crust and mantle for improved event location.  

SciTech Connect (OSTI)

To test the hypothesis that high quality 3D Earth models will produce seismic event locations which are more accurate and more precise, we are developing a global 3D P wave velocity model of the Earth's crust and mantle using seismic tomography. In this paper, we present the most recent version of our model, SALSA3D (SAndia LoS Alamos) version 1.4, and demonstrate its ability to reduce mislocations for a large set of realizations derived from a carefully chosen set of globally-distributed ground truth events. Our model is derived from the latest version of the Ground Truth (GT) catalog of P and Pn travel time picks assembled by Los Alamos National Laboratory. To prevent over-weighting due to ray path redundancy and to reduce the computational burden, we cluster rays to produce representative rays. Reduction in the total number of ray paths is > 55%. The model is represented using the triangular tessellation system described by Ballard et al. (2009), which incorporates variable resolution in both the geographic and radial dimensions. For our starting model, we use a simplified two layer crustal model derived from the Crust 2.0 model over a uniform AK135 mantle. Sufficient damping is used to reduce velocity adjustments so that ray path changes between iterations are small. We obtain proper model smoothness by using progressive grid refinement, refining the grid only around areas with significant velocity changes from the starting model. At each grid refinement level except the last one we limit the number of iterations to prevent convergence thereby preserving aspects of broad features resolved at coarser resolutions. Our approach produces a smooth, multi-resolution model with node density appropriate to both ray coverage and the velocity gradients required by the data. This scheme is computationally expensive, so we use a distributed computing framework based on the Java Parallel Processing Framework, providing us with {approx}400 processors. Resolution of our model is assessed using a variation of the standard checkerboard method, as well as by directly estimating the diagonal of the model resolution matrix based on the technique developed by Bekas, et al. We compare the travel-time prediction and location capabilities of this model over standard 1D models. We perform location tests on a global, geographically-distributed event set with ground truth levels of 5 km or better. These events generally possess hundreds of Pn and P phases from which we can generate different realizations of station distributions, yielding a range of azimuthal coverage and proportions of teleseismic to regional arrivals, with which we test the robustness and quality of relocation. The SALSA3D model reduces mislocation over standard 1D ak135, especially with increasing azimuthal gap. The 3D model appears to perform better for locations based solely or dominantly on regional arrivals, which is not unexpected given that ak135 represents a global average and cannot therefore capture local and regional variations.

Ballard, Sanford; Encarnacao, Andre Villanova; Begnaud, Michael A. (Los Alamos National Laboratories); Rowe, Charlotte A. (Los Alamos National Laboratories); Lewis, Jennifer E.; Young, Christopher John; Chang, Marcus C.; Hipp, James Richard

2010-05-01T23:59:59.000Z

391

Intrinsic Uncertainties in Modeling Complex Systems.  

SciTech Connect (OSTI)

Models are built to understand and predict the behaviors of both natural and artificial systems. Because it is always necessary to abstract away aspects of any non-trivial system being modeled, we know models can potentially leave out important, even critical elements. This reality of the modeling enterprise forces us to consider the prospective impacts of those effects completely left out of a model - either intentionally or unconsidered. Insensitivity to new structure is an indication of diminishing returns. In this work, we represent a hypothetical unknown effect on a validated model as a finite perturba- tion whose amplitude is constrained within a control region. We find robustly that without further constraints, no meaningful bounds can be placed on the amplitude of a perturbation outside of the control region. Thus, forecasting into unsampled regions is a very risky proposition. We also present inherent difficulties with proper time discretization of models and representing in- herently discrete quantities. We point out potentially worrisome uncertainties, arising from math- ematical formulation alone, which modelers can inadvertently introduce into models of complex systems. Acknowledgements This work has been funded under early-career LDRD project %23170979, entitled %22Quantify- ing Confidence in Complex Systems Models Having Structural Uncertainties%22, which ran from 04/2013 to 09/2014. We wish to express our gratitude to the many researchers at Sandia who con- tributed ideas to this work, as well as feedback on the manuscript. In particular, we would like to mention George Barr, Alexander Outkin, Walt Beyeler, Eric Vugrin, and Laura Swiler for provid- ing invaluable advice and guidance through the course of the project. We would also like to thank Steven Kleban, Amanda Gonzales, Trevor Manzanares, and Sarah Burwell for their assistance in managing project tasks and resources.

Cooper, Curtis S; Bramson, Aaron L.; Ames, Arlo L.

2014-09-01T23:59:59.000Z

392

E-Print Network 3.0 - american monsoon system Sample Search Results  

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

Variations of the Global Monsoon Precipitation in the Last Millennium: Results from ECHO-G Model Summary: variability of the global monsoon system has been considerably less...

393

Global Banks Marketing Communication in Jordan: Standardisation or Adaptation – Developing an Effective Integrated Marketing Communication Model to Target the Jordanian Market: A Study of Global Banks in Jordan.  

E-Print Network [OSTI]

??This research is concerned with international Integrated Marketing Communications (IMC) by global banks targeting a Jordanian audience. The main research question addressed in this work… (more)

Samawi, Jamil Nazih

2011-01-01T23:59:59.000Z

394

Global data set of biogenic VOC emissions calculated by the MEGAN model over the last 30 years  

SciTech Connect (OSTI)

The Model of Emissions of Gases and Aerosols from Nature (MEGANv2.1) together with the Modern-Era Retrospective Analysis for Research and Applications (MERRA) meteorological fields were used to create a global emission dataset of biogenic VOCs available on a monthly basis for the time period of 1980 - 2010. This dataset is called MEGAN-MACC. The model estimated mean annual total BVOC emission of 760 Tg(C) yr1 consisting of isoprene (70%), monoterpenes (11%), methanol (6%), acetone (3%), sesquiterpenes (2.5%) and other BVOC species each contributing less than 2 %. Several sensitivity model runs were performed to study the impact of different model input and model settings on isoprene estimates and resulted in differences of * 17% of the reference isoprene total. A greater impact was observed for sensitivity run applying parameterization of soil moisture deficit that led to a 50% reduction of isoprene emissions on a global scale, most significantly in specific regions of Africa, South America and Australia. MEGAN-MACC estimates are comparable to results of previous studies. More detailed comparison with other isoprene in ventories indicated significant spatial and temporal differences between the datasets especially for Australia, Southeast Asia and South America. MEGAN-MACC estimates of isoprene and*-pinene showed a reasonable agreement with surface flux measurements in the Amazon andthe model was able to capture the seasonal variation of emissions in this region.

Sindelarova, K.; Granier, Claire; Bouarar, I.; Guenther, Alex B.; Tilmes, S.; Stavrakou, T.; Muller, J. F.; Kuhn, U.; Stefani, P.; Knorr, W.

2014-09-09T23:59:59.000Z

395

Wind Technology Modeling Within the System Advisor Model (SAM) (Poster)  

SciTech Connect (OSTI)

This poster provides detail for implementation and the underlying methodology for modeling wind power generation performance in the National Renewable Energy Laboratory's (NREL's) System Advisor Model (SAM). SAM's wind power model allows users to assess projects involving one or more large or small wind turbines with any of the detailed options for residential, commercial, or utility financing. The model requires information about the wind resource, wind turbine specifications, wind farm layout (if applicable), and costs, and provides analysis to compare the absolute or relative impact of these inputs. SAM is a system performance and economic model designed to facilitate analysis and decision-making for project developers, financers, policymakers, and energy researchers. The user pairs a generation technology with a financing option (residential, commercial, or utility) to calculate the cost of energy over the multi-year project period. Specifically, SAM calculates the value of projects which buy and sell power at retail rates for residential and commercial systems, and also for larger-scale projects which operate through a power purchase agreement (PPA) with a utility. The financial model captures complex financing and rate structures, taxes, and incentives.

Blair, N.; Dobos, A.; Ferguson, T.; Freeman, J.; Gilman, P.; Whitmore, J.

2014-05-01T23:59:59.000Z

396

National Energy Modeling System: An Overview  

Gasoline and Diesel Fuel Update (EIA)

6) 6) Distribution Category UC-950 The National Energy Modeling System: An Overview March 1996 Energy Information Administration Office of Integrated Analysis and Forecasting U.S. Department of Energy Washington, DC 20585 This report was prepared by the Energy Information Administration, the independent statistical and analytical agency within the Department of Energy. The information contained herein should not be construed as advocating or reflecting any policy position of the Department of Energy or of any other organization. PREFACE The National Energy Modeling System: An Overview (Overview) provides a summary description of the National Energy Modeling System (NEMS), which was used to generate the forecasts of energy production, demand, imports, and prices through the year 2015 for the Annual Energy Outlook 1996 (AEO96), (DOE/EIA- 0383(96)), released in January

397

Normal-form approach to spatiotemporal pattern formation in globally coupled electrochemical systems  

Science Journals Connector (OSTI)

We show that the experimental global coupling (GC) of spatially extended electrochemical oscillators is weak close to a supercritical Hopf bifurcation. A center manifold reduction allows then the normal form which comprises the GC and the naturally existing nonlocal (migration) coupling (NLC) to be derived. We show that the interaction between NLC and GC widens the spectrum of coherent structures found in globally coupled oscillatory media and allows for wavelength selection of standing waves, stabilization of phase clusters without breaking phase invariance, and creation of heteroclinic networks connecting families of oscillatory states characterized by different spatial symmetries.

Vladimir García-Morales and Katharina Krischer

2008-11-11T23:59:59.000Z

398

Advanced PHEV Engine Systems and Emissions Control Modeling and...  

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

PHEV Engine Systems and Emissions Control Modeling and Analysis Advanced PHEV Engine Systems and Emissions Control Modeling and Analysis 2011 DOE Hydrogen and Fuel Cells Program,...

399

Implementing Applications with the Earth System Modeling Framework  

Science Journals Connector (OSTI)

The Earth System Modeling Framework (ESMF) project is developing a standard software platform for Earth system models. The standard defines a component architecture superstructure...

Chris Hill; Cecelia DeLuca; V. Balaji…

2006-01-01T23:59:59.000Z

400

Statistically downscaling from an Earth System Model of Intermediate  

E-Print Network [OSTI]

Statistically downscaling from an Earth System Model of Intermediate Complexity to reconstruct past Earth System Models of Intermediate Complexity (EMICs) have the advantage of allowing transient

Feigon, Brooke

Note: This page contains sample records for the topic "global system modeling" 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

Analysis Models and Tools: Systems Analysis of Hydrogen and Fuel...  

Broader source: Energy.gov (indexed) [DOE]

Analysis Models and Tools: Systems Analysis of Hydrogen and Fuel Cells Analysis Models and Tools: Systems Analysis of Hydrogen and Fuel Cells The Fuel Cell Technologies Office's...

402

White Paper Societal Dimensions of Earth System Modeling  

E-Print Network [OSTI]

on Societal Dimensions of Earth System Modeling July 5, 2011 #12; 2 Executive Summary · A Societal Dimensions of Earth System Modeling workshop was held

403

Modern Global Climate Change  

Science Journals Connector (OSTI)

...of data and information among observing systems, Earth system models, socioeconomic models, and models that address...of data and information among observing systems, Earth system models, socioeconomic models, and models that address...

Thomas R. Karl; Kevin E. Trenberth

2003-12-05T23:59:59.000Z

404

Post-doctoral Position Title Quantify the net global climate impacts of past and future land-  

E-Print Network [OSTI]

objective is to make this protocol widely available so that other earth system modeling groups outside uses and land use changes in global earth system models, and test the impact of various implementation

Pouyanne, Nicolas

405

Model for Configurational Thermodynamics in Ionic Systems  

Science Journals Connector (OSTI)

We develop a formalism to model configurational thermodynamics in ionic systems with multiple anion and cation species. Because cations and anions can be partitioned into two interacting sublattices that do not exchange species, the dimensionality of configuration space is significantly reduced. The result is a model applicable to many important problems in ionic systems. Here we show that the effect of an order-disorder transition in one sublattice on the other depends on how the symmetry is changed through the transition, as well as on the strength of the interactions.

P. D. Tepesch; G. D. Garbulsky; G. Ceder

1995-03-20T23:59:59.000Z

406

Minimal model for avalanches in granular systems  

Science Journals Connector (OSTI)

A nonlinear model for the dynamics of avalanches in granular systems is presented. It is based on mean-field equations for the particle velocity and the angle of the surface of the granular system. The friction force is discontinuous at zero velocity and increases monotonically with the square of the velocity. The model explains the main features of the dynamics of avalanches in analytical detail. It also explains the logarithmic decay behavior of the angle of the pile in the presence of vibrations as found experimentally by Jaeger et al. [Phys. Rev. Lett. 62, 40 (1990)].

Stefan J. Linz and Peter Hänggi

1995-03-01T23:59:59.000Z

407

The Resilience of the Indian Economy to Rising Oil Prices as a Validation Test for a Global Energy-Environment-Economy CGE Model  

E-Print Network [OSTI]

1 The Resilience of the Indian Economy to Rising Oil Prices as a Validation Test for a Global., 2009, `The resilience of the Indian economy to rising oil prices as a validation test for a global so, it compares the modeled and observed responses of the Indian economy to the rise of oil price

Paris-Sud XI, Université de

408

Modeling of Lean Exhaust Emissions Control Systems | Department...  

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

Lean Exhaust Emissions Control Systems Modeling of Lean Exhaust Emissions Control Systems 2002 DEER Conference Presentation: National Renewable Energy Laboratory...

409

Toward Random Sampling of Model Error in the Canadian Ensemble Prediction System  

Science Journals Connector (OSTI)

An updated global ensemble prediction system became operational at the Meteorological Service of Canada in July 2007. The new elements of the system include the use of 20 members instead of 16, a single dynamical core [the Global Environmental ...

Martin Charron; Gérard Pellerin; Lubos Spacek; P. L. Houtekamer; Normand Gagnon; Herschel L. Mitchell; Laurent Michelin

2010-05-01T23:59:59.000Z

410

Multi-century Changes to Global Climate and Carbon Cycle: Results from a Coupled Climate and Carbon Cycle Model  

SciTech Connect (OSTI)

In this paper, we use a coupled climate and carbon cycle model to investigate the global climate and carbon cycle changes out to year 2300 that would occur if CO{sub 2} emissions from all the currently estimated fossil fuel resources were released to the atmosphere. By year 2300, the global climate warms by about 8 K and atmospheric CO{sub 2} reaches 1423 ppmv. The warming is higher than anticipated because the sensitivity to radiative forcing increases as the simulation progresses. In our simulation, the rate of emissions peak at over 30 PgC yr{sup -1} early in the 22nd century. Even at year 2300, nearly 50% of cumulative emissions remain in the atmosphere. In our simulations both soils and living biomass are net carbon sinks throughout the simulation. Despite having relatively low climate sensitivity and strong carbon uptake by the land biosphere, our model projections suggest severe long-term consequences for global climate if all the fossil-fuel carbon is ultimately released to the atmosphere.

Bala, G; Caldeira, K; Mirin, A; Wickett, M; Delire, C

2005-02-17T23:59:59.000Z

411

Improvement of lightning NOx in the TM5 global chemistry transport model  

E-Print Network [OSTI]

, a key greenhouse gas, and for the formation of the hydroxyl28 radical, which removes methane, also a key greenhouse gas. Estimates of the global lightning NOx production vary29 by an order of magnitude interpreting the lighting NOx contribu-36 tion from satellite and aircraft observations of NO2 in comparison

Haak, Hein

412

An Integrated Assessment Framework for Uncertainty Studies in Global and Regional Climate Change: The IGSM-CAM  

E-Print Network [OSTI]

This paper describes an integrated assessment framework for uncertainty studies in global and regional climate change. In this framework, the Massachusetts Institute of Technology (MIT) Integrated Global System Model (IGSM), ...

Monier, Erwan

2012-06-18T23:59:59.000Z

413

Model-based integrated management: applying autonomic systems engineering to network and systems management  

Science Journals Connector (OSTI)

We present a novel approach for integrated management of networks and information systems, based on the specification of executable behaviour models. A model processing plane is introduced, consisting of a number of processing units that together form ... Keywords: ASE, autonomic systems, autonomic systems engineering, behaviour modelling, information systems, management integration, model transformation, model-based integrated management, network management, systems management

Edzard Hofig; Peter H. Deussen

2011-12-01T23:59:59.000Z

414

Land-use change trajectories up to 2050: insights from a global agro-economic model comparison  

SciTech Connect (OSTI)

Changes in agricultural land use have important implications for environmental services. Previous studies of agricultural land-use futures have been published indicating large uncertainty due to different model assumptions and methodologies. In this article we present a first comprehensive comparison of global agro-economic models that have harmonized drivers of population, GDP, and biophysical yields. The comparison allows us to ask two research questions: (1) How much cropland will be used under different socioeconomic and climate change scenarios? (2) How can differences in model results be explained? The comparison includes four partial and six general equilibrium models that differ in how they model land supply and amount of potentially available land. We analyze results of two different socioeconomic scenarios and three climate scenarios (one with constant climate). Most models (7 out of 10) project an increase of cropland of 10–25% by 2050 compared to 2005 (under constant climate), but one model projects a decrease. Pasture land expands in some models, which increase the treat on natural vegetation further. Across all models most of the cropland expansion takes place in South America and sub-Saharan Africa. In general, the strongest differences in model results are related to differences in the costs of land expansion, the endogenous productivity responses, and the assumptions about potential cropland.

Schmitz, Christoph; van Meijl, Hans; Kyle, G. Page; Nelson, Gerald C.; Fujimori, Shinichiro; Gurgel, Angelo; Havlik, Petr; Heyhoe, Edwina; Mason d'Croz, Daniel; Popp, Alexander; Sands, Ronald; Tabeau, Andrzej; van der Mensbrugghe, Dominique; von Lampe, Martin; Wise, Marshall A.; Blanc, Elodie; Hasegawa, Tomoko; Kavallari, Aikaterini; Valin, Hugo

2014-01-01T23:59:59.000Z

415

Cost effectiveness of recycling: A systems model  

SciTech Connect (OSTI)

Highlights: • Curbside collection of recyclables reduces overall system costs over a range of conditions. • When avoided costs for recyclables are large, even high collection costs are supported. • When avoided costs for recyclables are not great, there are reduced opportunities for savings. • For common waste compositions, maximizing curbside recyclables collection always saves money. - Abstract: Financial analytical models of waste management systems have often found that recycling costs exceed direct benefits, and in order to economically justify recycling activities, externalities such as household expenses or environmental impacts must be invoked. Certain more empirically based studies have also found that recycling is more expensive than disposal. Other work, both through models and surveys, have found differently. Here we present an empirical systems model, largely drawn from a suburban Long Island municipality. The model accounts for changes in distribution of effort as recycling tonnages displace disposal tonnages, and the seven different cases examined all show that curbside collection programs that manage up to between 31% and 37% of the waste stream should result in overall system savings. These savings accrue partially because of assumed cost differences in tip fees for recyclables and disposed wastes, and also because recycling can result in a more efficient, cost-effective collection program. These results imply that increases in recycling are justifiable due to cost-savings alone, not on more difficult to measure factors that may not impact program budgets.

Tonjes, David J., E-mail: david.tonjes@stonybrook.edu [Department of Technology and Society, College of Engineering and Applied Sciences, Stony Brook University, Stony Brook, NY 11794-3560 (United States); Waste Reduction and Management Institute, School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY 11794-5000 (United States); Center for Bioenergy Research and Development, Advanced Energy Research and Technology Center, Stony Brook University, 1000 Innovation Rd., Stony Brook, NY 11794-6044 (United States); Mallikarjun, Sreekanth, E-mail: sreekanth.mallikarjun@stonybrook.edu [Department of Technology and Society, College of Engineering and Applied Sciences, Stony Brook University, Stony Brook, NY 11794-3560 (United States)

2013-11-15T23:59:59.000Z

416

Scientific Final Report: COLLABORATIVE RESEARCH: CONTINUOUS DYNAMIC GRID ADAPTATION IN A GLOBAL ATMOSPHERIC MODEL: APPLICATION AND REFINEMENT  

SciTech Connect (OSTI)

This project had goals of advancing the performance capabilities of the numerical general circulation model EULAG and using it to produce a fully operational atmospheric global climate model (AGCM) that can employ either static or dynamic grid stretching for targeted phenomena. The resulting AGCM combined EULAG's advanced dynamics core with the 'physics' of the NCAR Community Atmospheric Model (CAM). Effort discussed below shows how we improved model performance and tested both EULAG and the coupled CAM-EULAG in several ways to demonstrate the grid stretching and ability to simulate very well a wide range of scales, that is, multi-scale capability. We leveraged our effort through interaction with an international EULAG community that has collectively developed new features and applications of EULAG, which we exploited for our own work summarized here. Overall, the work contributed to over 40 peer-reviewed publications and over 70 conference/workshop/seminar presentations, many of them invited.

William J. Gutowski; Joseph M. Prusa, Piotr K. Smolarkiewicz

2012-04-09T23:59:59.000Z

417

The Persistently Variable “Background” Stratospheric Aerosol Layer and Global Climate Change  

Science Journals Connector (OSTI)

...in global radiative forcing (Fig. 3) over the past decade. The model has been extensively compared to other Earth system models of intermediate complexity as well as to Atmosphere-Ocean General Circulation Models [AOGCMs, see (28...

S. Solomon; J. S. Daniel; R. R. Neely III; J.-P. Vernier; E. G. Dutton; L. W. Thomason

2011-08-12T23:59:59.000Z

418

Global-to-local incompatibility, monogamy of entanglement, and ground-state dimerization: Theory and observability of quantum frustration in systems with competing interactions  

E-Print Network [OSTI]

Frustration in quantum many body systems is quantified by the degree of incompatibility between the local and global orders associated, respectively, to the ground states of the local interaction terms and the global ground state of the total many-body Hamiltonian. This universal measure is bounded from below by the ground-state bipartite block entanglement. For many-body Hamiltonians that are sums of two-body interaction terms, a further inequality relates quantum frustration to the pairwise entanglement between the constituents of the local interaction terms. This additional bound is a consequence of the limits imposed by monogamy on entanglement shareability. We investigate the behavior of local pair frustration in quantum spin models with competing interactions on different length scales and show that valence bond solids associated to exact ground-state dimerization correspond to a transition from generic frustration, i.e. geometric, common to classical and quantum systems alike, to genuine quantum frustration, i.e. solely due to the non-commutativity of the different local interaction terms. We discuss how such frustration transitions separating genuinely quantum orders from classical-like ones are detected by observable quantities such as the static structure factor and the interferometric visibility.

S. M. Giampaolo; B. C. Hiesmayr; F. Illuminati

2015-01-25T23:59:59.000Z

419

Dynamic model of hysteretic elastic systems  

Science Journals Connector (OSTI)

A model for the dynamical behavior of a hysteretic elastic system is introduced and studied numerically. This model consists of a chain of hysteretic elastic elements. Each elastic element is a spring with properties that depend on an Ising-like state variable having Brownian dynamics in an energy landscape with structure that is sensitive to the forces which the elastic element must support. A single elastic element is studied carefully, numerically in order to establish its basic behavior. A one dimensional chain of N=500 elastic elements, driven like a resonant bar, is studied numerically. The data from this study are analyzed by the methods employed in analyzing similar experimental data. The behavior of the numerical model compares well with the behavior of physical realizations of hysteretic elastic systems.

Barbara Capogrosso-Sansone and R. A. Guyer

2002-12-05T23:59:59.000Z

420

Model for a multicomponent quantum system  

Science Journals Connector (OSTI)

In a recent paper, Lai introduced a lattice-gas model. In this paper we generalize Lai's model, making application to various systems such as dilute Heisenberg magnets, higher-spin systems, and a lattice of SU(3) triplets. By a careful consideration of general thermodynamic stability, and by variational arguments, we demonstrate Lai's solution to be incorrect, and in turn produce the correct solution in this case and in other cases including higher-dimensional models. The remaining cases we treat in one dimension by Bethe's ansatz, reducing the problem to coupled integral equations. We locate the singularities of the ground-state energy in the phase plane; and we explicitly calculate the absolute-ground-state energy, excitations above the absolute ground state, and the first correction to the absolute ground state for small concentrations of impurities.

Bill Sutherland

1975-11-01T23:59:59.000Z

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


421

Oak Ridge Evacuation Modeling System.pub  

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

Evacuation Modeling Evacuation Modeling System (OREMS) Research Brief Oak Ridge National Laboratory managed by UT-Battelle, LLC for the U.S. Department of Energy under Contract number DE-AC05-00OR22725 Research Areas Freight Flows Passenger Flows Supply Chain Efficiency Transportation: Energy Environment Safety Security Vehicle Technologies T he vulnerability of communities to terrorist inflicted damage at facilities such as dams, power plants, or oil/gas distribution facilities, and others, is partly determined by the ability to avoid impacts. OREMS, or the Oak Ridge Evacuation Modeling System, is a Windows- based software program designed to analyze and evaluate large-scale vehicular emergency evacuations, conduct evacuation time estimation studies, and develop evacuation

422

Statistical Global Modeling of Beta-Decay Halflives Systematics Using Multilayer Feedforward Neural Networks and Support Vector Machines  

E-Print Network [OSTI]

In this work, the beta-decay halflives problem is dealt as a nonlinear optimization problem, which is resolved in the statistical framework of Machine Learning (LM). Continuing past similar approaches, we have constructed sophisticated Artificial Neural Networks (ANNs) and Support Vector Regression Machines (SVMs) for each class with even-odd character in Z and N to global model the systematics of nuclei that decay 100% by the beta-minus-mode in their ground states. The arising large-scale lifetime calculations generated by both types of machines are discussed and compared with each other, with the available experimental data, with previous results obtained with neural networks, as well as with estimates coming from traditional global nuclear models. Particular attention is paid on the estimates for exotic and halo nuclei and we focus to those nuclides that are involved in the r-process nucleosynthesis. It is found that statistical models based on LM can at least match or even surpass the predictive performance of the best conventional models of beta-decay systematics and can complement the latter.

N. J. Costiris; E. Mavrommatis; K. A. Gernoth; J. W. Clark; H. Li

2008-09-02T23:59:59.000Z

423

An examination of urban heat island characteristics in a global climate model  

E-Print Network [OSTI]

and urban properties devel- oped by Jackson et al. (2010). Urban extent, defined for four classes [tall building district (TBD), and high, medium and low density (HD, MD, LD)], was derived from LandScan 2004 [Oak Ridge National Laboratories (ORNL) 2005, Land...Scan? Global Population Database, Oak Ridge, TN (http://www.ornl.gov/landscan/)], a pop- ulation density dataset derived from census data, night- time lights satellite observations, road proximity and slope (Dobson et al., 2000). The urban extent data...

Oleson, Keith W.; Bonan, Gordon B.; Feddema, Johannes J.; Jackson, Trisha L.

2010-07-27T23:59:59.000Z

424

Global stability of a delayed HIV-1 infection model with absorption and CTL immune response  

Science Journals Connector (OSTI)

......d dt V11(t) = -d (x - x0)2 x + x0 1 + v(t) - c2u v(t) - c3bz(t). (2.4) GLOBAL STABILITY OF A...e-m > a and R0 c2u x0 - c2u = a(du + ) d(k e-m - a) (R0 - 1). Hence, we......

Xiaohong Tian; Rui Xu

2014-04-01T23:59:59.000Z

425

Projected climate regime shift under future global warming from multi-model, multi-scenario CMIP5 simulations  

Science Journals Connector (OSTI)

Abstract This study examined shifts in climate regimes over the global land area using the Köppen–Trewartha (K–T) climate classification by analyzing observations during 1900–2010, and simulations during 1900–2100 from twenty global climate models participating in Phase 5 of the Coupled Model Inter-comparison Project (CMIP5). Under the Intergovernmental Panel on Climate Change Representative Concentration Pathways 8.5 (RCP8.5) scenario, the models projected a 3°–10 °C warming in annual temperature over the global land area by the end of the twenty-first century, with strong (moderate) warming in the high (middle) latitudes of the Northern Hemisphere and weaker warming in the tropics and the Southern Hemisphere. The projected changes in precipitation vary considerably in space and present greater uncertainties among the models. Overall, the models are consistent in projecting increasing precipitation over the high-latitude of the Northern Hemisphere, and reduced precipitation in the Mediterranean, southwestern North America, northern and southern Africa and Australia. Based on the projected changes in temperature and precipitation, the K–T climate types would shift toward warmer and drier climate types from the current climate distribution. Regions of temperate, tropical and dry climate types are projected to expand, while regions of polar, sub-polar and subtropical climate types are projected to contract. The magnitudes of the projected changes are stronger in the RCP8.5 scenario than the low emission scenario RCP4.5. On average, the climate types in 31.4% and 46.3% of the global land area are projected to change by the end of the twenty-first century under RCP4.5 and RCP8.5 scenarios, respectively. Further analysis suggests that changes in precipitation played a slightly more important role in causing shifts of climate type during the twentieth century. However, the projected changes in temperature play an increasingly important role and dominate shifts in climate type when the warming becomes more pronounced in the twenty-first century.

Song Feng; Qi Hu; Wei Huang; Chang-Hoi Ho; Ruopu Li; Zhenghong Tang

2014-01-01T23:59:59.000Z

426

Global SO(3) x SO(3) x U(1) symmetry of the Hubbard model on bipartite lattices  

SciTech Connect (OSTI)

In this paper the global symmetry of the Hubbard model on a bipartite lattice is found to be larger than SO(4). The model is one of the most studied many-particle quantum problems, yet except in one dimension it has no exact solution, so that there remain many open questions about its properties. Symmetry plays an important role in physics and often can be used to extract useful information on unsolved non-perturbative quantum problems. Specifically, here it is found that for on-site interaction U {ne} 0 the local SU(2) x SU(2) x U(1) gauge symmetry of the Hubbard model on a bipartite lattice with N{sub a}{sup D} sites and vanishing transfer integral t = 0 can be lifted to a global [SU(2) x SU(2) x U(1)]/Z{sub 2}{sup 2} = SO(3) x SO(3) x U(1) symmetry in the presence of the kinetic-energy hopping term of the Hamiltonian with t > 0. (Examples of a bipartite lattice are the D-dimensional cubic lattices of lattice constant a and edge length L = N{sub a}a for which D = 1, 2, 3,... in the number N{sub a}{sup D} of sites.) The generator of the new found hidden independent charge global U(1) symmetry, which is not related to the ordinary U(1) gauge subgroup of electromagnetism, is one half the rotated-electron number of singly occupied sites operator. Although addition of chemical-potential and magnetic-field operator terms to the model Hamiltonian lowers its symmetry, such terms commute with it. Therefore, its 4{sup N}{sub a}{sup D} energy eigenstates refer to representations of the new found global [SU(2) x SU(2) x U(1)]/Z{sub 2}{sup 2} = SO(3) x SO(3) x U(1) symmetry. Consistently, we find that for the Hubbard model on a bipartite lattice the number of independent representations of the group SO(3) x SO(3) x U(1) equals the Hilbert-space dimension 4{sup N}{sub a}{sup D}. It is confirmed elsewhere that the new found symmetry has important physical consequences.

Carmelo, J.M.P., E-mail: carmelo@fisica.uminho.p [GCEP-Centre of Physics, University of Minho, Campus Gualtar, P-4710-057 Braga (Portugal); Ostlund, Stellan [Goeteborgs Universitet, Gothenburg 41296 (Sweden); Sampaio, M.J. [GCEP-Centre of Physics, University of Minho, Campus Gualtar, P-4710-057 Braga (Portugal)

2010-08-15T23:59:59.000Z

427

Greenhouse Gas Mitigation Options in ISEEM Global Energy Model: 2010-2050 Scenario Analysis for Least-Cost Carbon Reduction in Iron and Steel Sector  

E-Print Network [OSTI]

2011. The World Coke & Coking Coal Markets, Global SteelSengupta, 2008. Rise of the Coal-Based Sponge Iron Sector in1999. Blast Furnace Granular Coal Injection System, Final

Karali, Nihan

2014-01-01T23:59:59.000Z

428

Thermal model of solar absorption HVAC systems  

SciTech Connect (OSTI)

This paper presents a thermal model that describes the performance of solar absorption HVAC systems. The model considers the collector array, the building cooling and heating loads, the absorption chiller and the high temperature storage. Heat losses from the storage tank and piping are included in the model. All of the results presented in the paper are for an array of flat plate solar collectors with black chrome (selective surface) absorber plates. The collector efficiency equation is used to calculate the useful heat output from the array. The storage is modeled as a non-stratified tank with polyurethane foam insulation. The system is assumed to operate continuously providing air conditioning during the cooling season, space heating during the winter and hot water throughout the year. The amount of heat required to drive the chiller is determined from the coefficient of performance of the absorption cycle. Results are presented for a typical COP of 0.7. The cooling capacity of the chiller is a function of storage (generator) temperature. The nominal value is 190 F (88 C) and the range of values considered is 180 F (82 C) to 210 F (99 C). Typical building cooling and heating loads are determined as a function of ambient conditions. Performance results are presented for Sacramento, CA and Washington, D.C. The model described in the paper makes use of National Solar Radiation Data Base (NSRDB) data and results are presented for these two locations. The uncertainties in the NSRDB are estimated to be in a range of 6% to 9%. This is a significant improvement over previously available data. The model makes it possible to predict the performance of solar HVAC systems and calculate quantities such as solar fraction, storage temperature, heat losses and parasitic power for every hour of the period for which data are available.

Bergquam, J.B.; Brezner, J.M. [California State Univ., Sacramento, CA (United States). Dept. of Mechanical Engineering; [Bergquam Energy Systems, Sacramento, CA (United States)

1995-11-01T23:59:59.000Z

429

Magnetic hysteresis in two model spin systems  

Science Journals Connector (OSTI)

A systematic study of hysteresis in model continuum and lattice spin systems is undertaken by constructing a statistical-mechanical theory wherein spatial fluctuations of the order parameter are incorporated. The theory is used to study the shapes and areas of the hysteresis loops as functions of the amplitude (H0) and frequency (?) of the magnetic field. The response of the spin systems to a pulsed magnetic field is also studied. The continuum model that we study is a three-dimensional (?2)2 model with O(N) symmetry in the large-N limit. The dynamics of this model are specified by a Langevin equation. We find that the area A of the hysteresis loop scales as A?H00.66?0.33 for low values of the amplitude and frequency of the magnetic field. The hysteretic response of a two-dimensional, nearest-neighbor, ferromagnetic Ising model is studied by a Monte Carlo simulation on 10×10, 20×20, and 50×50 lattices. The framework that we develop is compared with other theories of hysteresis. The relevance of these results to hysteresis in real magnets is discussed.

Madan Rao; H. R. Krishnamurthy; Rahul Pandit

1990-07-01T23:59:59.000Z

430

Percolation model for relaxation in random systems  

Science Journals Connector (OSTI)

We have measured the magnetic relaxation of several Au:Fe alloys from 10-5 to 104 sec after removing an applied field. The quality and range of the data are sufficient to demonstrate significant deviations from all functions previously used to characterize the dynamics of similar systems. A simple model, activated relaxation of dispersive excitations on a percolation distribution of finite-sized domains, gives excellent agreement with the measurements and may provide a common link between fundamental excitations and observed behavior in random systems.

R. V. Chamberlin and D. N. Haines

1990-10-22T23:59:59.000Z

431

Analysis of Precipitation Using Satellite Observations and Comparisons with Global Climate Models  

E-Print Network [OSTI]

is investigated by comparisons with satellite observa- iv tions. Speci cally, six-year long (2000-2005) simulations are performed using a high- resolution (36-km) Weather Research Forecast (WRF) model and the Community Atmosphere Model (CAM) at T85 spatial... . . . . . . . . . . . . . . . . 31 B. Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 1. Satellite data . . . . . . . . . . . . . . . . . . . . . . . 33 2. Weather research and forecast model simulations . . . 34 3. Community atmosphere model simulations...

Murthi, Aditya

2011-08-08T23:59:59.000Z

432

Phonon distribution in a model polariton system  

Science Journals Connector (OSTI)

We consider a simple model polariton problem and show that the phonons in this system will never exhibit sub-Poissonian statistics. We furthermore observe that the probability distribution of the phonons will be classical at all temperatures, although the polariton complex as a whole can have a nonclassical behavior below a threshold temperature whose value will depend on the photon-phonon coupling strength.

Sharmishtha Ghoshal and Ashok Chatterjee

1995-07-01T23:59:59.000Z

433

The Community Climate System Model: CCSM3  

SciTech Connect (OSTI)

A new version of the Community Climate System Model (CCSM) has been developed and released to the climate community. CCSM3 is a coupled climate model with components representing the atmosphere, ocean, sea ice, and land surface connected by a flux coupler. CCSM3 is designed to produce realistic simulations over a wide range of spatial resolutions, enabling inexpensive simulations lasting several millennia or detailed studies of continental-scale climate change. This paper will show results from the configuration used for climate-change simulations with a T85 grid for atmosphere and land and a 1-degree grid for ocean and sea-ice. The new system incorporates several significant improvements in the scientific formulation. The enhancements in the model physics are designed to reduce or eliminate several systematic biases in the mean climate produced by previous editions of CCSM. These include new treatments of cloud processes, aerosol radiative forcing, land-atmosphere fluxes, ocean mixed-layer processes, and sea-ice dynamics. There are significant improvements in the sea-ice thickness, polar radiation budgets, equatorial sea-surface temperatures, ocean currents, cloud radiative effects, and ENSO teleconnections. CCSM3 can produce stable climate simulations of millenial duration without ad hoc adjustments to the fluxes exchanged among the component models. Nonetheless, there are still systematic biases in the ocean-atmosphere fluxes in western coastal regions, the spectrum of ENSO variability, the spatial distribution of precipitation in the Pacific and Indian Oceans, and the continental precipitation and surface air temperatures. We conclude with the prospects for extending CCSM to a more comprehensive model of the Earth's climate system.

Collins, W D; Blackmon, M; Bitz, C; Bonan, G; Bretherton, C S; Carton, J A; Chang, P; Doney, S; Hack, J J; Kiehl, J T; Henderson, T; Large, W G; McKenna, D; Santer, B D; Smith, R D

2004-12-27T23:59:59.000Z

434

Analysis of mid-tropospheric carbon monoxide data using a three- dimensional Global atmospheric Chemistry numerical Model  

SciTech Connect (OSTI)

The GChM atmospheric chemistry and transport model has been used to analyze the mid-tropospheric CO dataset obtained from NASA`s Measurement of Air Pollution by Satellites (MAPS) program. Fourteen simulations with a 3.75 horizontal resolution have been performed, including a base case and 13 sensitivity runs. The model reproduces many, but not all, of the major features of the MAPS dataset. Locations of peak CO mixing ratios associated with biomass burning as observed in the MAPS experiment are slightly farther south than the model result, indicating either greater horizontal transport than present in the model representation or a spatial difference between the location of modeled biomass fires and actual fires. The current version of GChM was shown to be relatively insensitive to the magnitude of the prescribed NO{sub x} and O{sub 3} global distributions and very insensitive to the depth of the mixed layer as parameterized in the model. Cloud convective transport was shown to play an important role in venting boundary layer CO to the free troposphere. This result agrees with prior meteorological analyses of the MAPS dataset that have-indirectly inferred the presence of convective activity through satellite-based information. Work is continuing to analyze the results of these simulations further and to perform more detailed comparisons between model results and MAPS data.

Easter, R.C.; Saylor, R.D.; Chapman, E.G.

1993-12-01T23:59:59.000Z

435

Modeling needs for very large systems.  

SciTech Connect (OSTI)

Most system performance models assume a point measurement for irradiance and that, except for the impact of shading from nearby obstacles, incident irradiance is uniform across the array. Module temperature is also assumed to be uniform across the array. For small arrays and hourly-averaged simulations, this may be a reasonable assumption. Stein is conducting research to characterize variability in large systems and to develop models that can better accommodate large system factors. In large, multi-MW arrays, passing clouds may block sunlight from a portion of the array but never affect another portion. Figure 22 shows that two irradiance measurements at opposite ends of a multi-MW PV plant appear to have similar irradiance (left), but in fact the irradiance is not always the same (right). Module temperature may also vary across the array, with modules on the edges being cooler because they have greater wind exposure. Large arrays will also have long wire runs and will be subject to associated losses. Soiling patterns may also vary, with modules closer to the source of soiling, such as an agricultural field, receiving more dust load. One of the primary concerns associated with this effort is how to work with integrators to gain access to better and more comprehensive data for model development and validation.

Stein, Joshua S.

2010-10-01T23:59:59.000Z

436

Modelling of Integrated Renewable Energy System  

Science Journals Connector (OSTI)

Energy is supplied in the form of electricity heat or fuels and an energy supply system must guarantee sufficient production and distribution of energy. An energy supply system based on renewable energy can be utilized as integrated renewable energy system (IRES) which can satisfy the energy needs of an area in appropriate & sustainable manner. Given the key role of renewable energy in rural electrification of remote rural areas the IRES for a given area can be modeled & optimized for meeting the energy needs. In the present paper Jaunpur block of Uttaranchal state of India has been selected as remote area. Based upon the data collected the resource potential and energy demand has been calculated & presented. The model on the basis of unit cost of the energy has been optimized using LINDO software 6.10 version. The results indicated that the optimized model has been found to the best choice for meeting the energy needs of the area. The results further indicated that for the above area either an IRES consisting of the above sources can provide a feasible solution in terms of energy fulfillments in the range of EPDF from 1.0 to 0.75.

A. K. Akella; R. P. Saini; M. P. Sharma

2007-01-01T23:59:59.000Z

437

Non-standard semantics of hybrid systems modelers  

Science Journals Connector (OSTI)

Hybrid system modelers have become a corner stone of complex embedded system development. Embedded systems include not only control components and software, but also physical devices. In this area, Simulink is a de facto standard design framework, and ... Keywords: Compilation of hybrid systems, Constructive semantics, Hybrid systems, Hybrid systems modelers, Kahn process networks, Non-standard analysis, Non-standard semantics

Albert Benveniste; Timothy Bourke; Benoít Caillaud; Marc Pouzet

2012-05-01T23:59:59.000Z

438

Progress Report 2008: A Scalable and Extensible Earth System Model for Climate Change Science  

SciTech Connect (OSTI)

This project employs multi-disciplinary teams to accelerate development of the Community Climate System Model (CCSM), based at the National Center for Atmospheric Research (NCAR). A consortium of eight Department of Energy (DOE) National Laboratories collaborate with NCAR and the NASA Global Modeling and Assimilation Office (GMAO). The laboratories are Argonne (ANL), Brookhaven (BNL) Los Alamos (LANL), Lawrence Berkeley (LBNL), Lawrence Livermore (LLNL), Oak Ridge (ORNL), Pacific Northwest (PNNL) and Sandia (SNL). The work plan focuses on scalablity for petascale computation and extensibility to a more comprehensive earth system model. Our stated goal is to support the DOE mission in climate change research by helping ... To determine the range of possible climate changes over the 21st century and beyond through simulations using a more accurate climate system model that includes the full range of human and natural climate feedbacks with increased realism and spatial resolution.

Drake, John B [ORNL; Worley, Patrick H [ORNL; Hoffman, Forrest M [ORNL; Jones, Phil [Los Alamos National Laboratory (LANL)

2009-01-01T23:59:59.000Z

439

Adaptive model training system and method  

DOE Patents [OSTI]

An adaptive model training system and method for filtering asset operating data values acquired from a monitored asset for selectively choosing asset operating data values that meet at least one predefined criterion of good data quality while rejecting asset operating data values that fail to meet at least the one predefined criterion of good data quality; and recalibrating a previously trained or calibrated model having a learned scope of normal operation of the asset by utilizing the asset operating data values that meet at least the one predefined criterion of good data quality for adjusting the learned scope of normal operation of the asset for defining a recalibrated model having the adjusted learned scope of normal operation of the asset.

Bickford, Randall L; Palnitkar, Rahul M

2014-11-18T23:59:59.000Z

440

Adaptive model training system and method  

DOE Patents [OSTI]

An adaptive model training system and method for filtering asset operating data values acquired from a monitored asset for selectively choosing asset operating data values that meet at least one predefined criterion of good data quality while rejecting asset operating data values that fail to meet at least the one predefined criterion of good data quality; and recalibrating a previously trained or calibrated model having a learned scope of normal operation of the asset by utilizing the asset operating data values that meet at least the one predefined criterion of good data quality for adjusting the learned scope of normal operation of the asset for defining a recalibrated model having the adjusted learned scope of normal operation of the asset.

Bickford, Randall L; Palnitkar, Rahul M; Lee, Vo

2014-04-15T23:59:59.000Z

Note: This page contains sample records for the topic "global system modeling" 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

Innovation and the dynamics of global warming  

Science Journals Connector (OSTI)

Abstract Global warming and the carbon cycle are a dynamic system with positive feedbacks. Fossil fuels are exhaustible resources. These two facts mean that innovation in clean energy technology, rather than mitigating global warming, can lead to a permanently higher temperature path. This paper explores the impact of innovation in the simplest model linking the economic theory of exhaustible resources with positive feedback dynamics in the carbon cycle.

Ralph A. Winter

2014-01-01T23:59:59.000Z

442

Creep motion of a model frictional system  

Science Journals Connector (OSTI)

We report on the dynamics of a model frictional system submitted to minute external perturbations. The system consists of a chain of sliders connected through elastic springs that rest on an incline. By introducing cyclic expansions and contractions of the springs we observe a reptation of the chain. We account for the average reptation velocity theoretically. The velocity of small systems exhibits a series of plateaus as a function of the incline angle. Due to elastic effects, there exists a critical amplitude below which the reptation is expected to cease. However, rather than a full stop of the creep, we observe in numerical simulations a transition between a continuous-creep and an irregular-creep regime when the critical amplitude is approached. The latter transition is reminiscent of the transition between the continuous and the irregular compaction of granular matter submitted to periodic temperature changes.

Baptiste Blanc; Luis A. Pugnaloni; Jean-Christophe Géminard

2011-12-27T23:59:59.000Z

443

Extreme multistability in a chemical model system  

Science Journals Connector (OSTI)

Coupled systems can exhibit an unusual kind of multistability, namely, the coexistence of infinitely many attractors for a given set of parameters. This extreme multistability is demonstrated to occur in coupled chemical model systems with various types of coupling. We show that the appearance of extreme multistability is associated with the emergence of a conserved quantity in the long-term limit. This conserved quantity leads to a “slicing” of the state space into manifolds corresponding to the value of the conserved quantity. The state space “slices” develop as t?? and there exists at least one attractor in each of them. We discuss the dependence of extreme multistability on the coupling and on the mismatch of parameters of the coupled systems.

Calistus N. Ngonghala; Ulrike Feudel; Kenneth Showalter

2011-05-09T23:59:59.000Z

444

A Vast Machine: Computer Models, Climate Data, and the Politics of Global Warming  

E-Print Network [OSTI]

Review: A Vast Machine: Computer Models, Climate Data, andEdwards, Paul N. A Vast Machine: Computer Models, ClimateEdwards, Paul N. 2004. "A vast machine: standards as social

Maret, Susan

2011-01-01T23:59:59.000Z

445

Towards locally and globally shape-aware reverse 3D modeling  

Science Journals Connector (OSTI)

The process of re-creating CAD models from actual physical parts, formally known as digital shape reconstruction (DSR) is an integral part of product development, especially in re-design. While, the majority of current methods used in DSR are surface-based, ... Keywords: CAD model parameterization, Digital shape reconstruction, Reverse 3D modeling, Volumetric segmentation

Manish Goyal; Sundar Murugappan; Cecil Piya; William Benjamin; Yi Fang; Min Liu; Karthik Ramani

2012-06-01T23:59:59.000Z

446

The Architecture of the Earth System Modeling Framework  

Science Journals Connector (OSTI)

The Earth System Modeling Framework (ESMF) project aims to develop a standard software platform for Earth system models based on open-software practices. Target applications range from operational numerical weather prediction to climate system change ... Keywords: earth system, modeling, ESMF, NASA

Chris Hill; Cecelia DeLuca; V. Balaji; Max Suarez; Arlindo da Silva

2004-01-01T23:59:59.000Z

447

Data Mining for Modeling Chiller Systems in Data Centers  

E-Print Network [OSTI]

Data Mining for Modeling Chiller Systems in Data Centers Debprakash Patnaik1 , Manish Marwah2 to the lack of "first principles" models of chiller systems. At the same time, they abound in data due into an actionable dynamic Bayesian network model of the system. This network is then used to explain observed system

448

Phase separation and charge-ordered phases of the d=3 Falicov-Kimball model at nonzero temperature: Temperature-density-chemical potential global phase diagram from renormalization-group theory  

E-Print Network [OSTI]

The global phase diagram of the spinless Falicov-Kimball model in d=3 spatial dimensions is obtained by renormalization-group theory. This global phase diagram exhibits five distinct phases. Four of these phases are ...

Sariyer, Ozan S.

449

Global Security  

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

Applications Global Security science-innovationassetsimagesicon-science.jpg Global Security National security depends on science and technology. The United States relies on...

450

Sensitivity of Twenty-First-Century Global-Mean Steric Sea Level Rise to Ocean Model Formulation  

Science Journals Connector (OSTI)

Two comprehensive Earth system models (ESMs), identical apart from their oceanic components, are used to estimate the uncertainty in projections of twenty-first-century sea level rise due to representational choices in ocean physical formulation. ...

Robert Hallberg; Alistair Adcroft; John P. Dunne; John P. Krasting; Ronald J. Stouffer

2013-05-01T23:59:59.000Z

451

Kinetic modelling of krypton fluoride laser systems  

SciTech Connect (OSTI)

A kinetic model has been developed for the KrF* rare gas halide laser system, specifically for electron-beam pumped mixtures of krypton, fluorine, and either helium or argon. The excitation produced in the laser gas by the e-beam was calculated numerically using an algorithm checked by comparing the predicted ionization yields in the pure rare gases with their experimental values. The excitation of the laser media by multi-kilovolt x-rays was also modeled and shown to be similar to that produced by high energy electrons. A system of equations describing the transfer of the initial gas excitation into the laser upper level was assembled using reaction rate constants from both experiment and theory. A one-dimensional treatment of the interaction of the laser radiation with the gas was formulated which considered spontaneous and stimulated emission and absorption. The predictions of this model were in good agreement with the fluorescence signals and gain and absorption measured experimentally.

Jancaitis, K.S.

1983-11-01T23:59:59.000Z

452

A feature model of coupling technologies for Earth System Models  

Science Journals Connector (OSTI)

Couplers that link together two or more numerical simulations are well-known abstractions in the Earth System Modeling (ESM) community. In the past decade, reusable software assets have emerged to facilitate scientists in implementing couplers. While there is a large amount of overlap in the features supported by software coupling technologies, their implementations differ significantly in terms of both functional and non-functional properties. Using a domain analysis method called feature analysis, we explore the spectrum of features supported by coupling technologies used to build today's production ESMs.

Rocky Dunlap; Spencer Rugaber; Leo Mark

2013-01-01T23:59:59.000Z

453

National Energy Modeling System (United States) | Open Energy Information  

Open Energy Info (EERE)

National Energy Modeling System (United States) National Energy Modeling System (United States) Jump to: navigation, search Tool Summary LAUNCH TOOL Name: National Energy Modeling System (United States) Focus Area: Biomass Topics: Policy, Deployment, & Program Impact Website: www.eia.gov/oiaf/aeo/overview/ Equivalent URI: cleanenergysolutions.org/content/national-energy-modeling-system-unite Language: English Policies: "Deployment Programs,Regulations" is not in the list of possible values (Deployment Programs, Financial Incentives, Regulations) for this property. DeploymentPrograms: Technical Assistance Regulations: Utility/Electricity Service Costs The National Energy Modeling System (NEMS) is a computer-based, energy-economy modelling system of the United States through 2030. NEMS

454

Models of National Energy Systems -focusing on biomass energy  

E-Print Network [OSTI]

Models of National Energy Systems - focusing on biomass energy Poul Erik Grohnheit Systems Analysis models · International development of large energy models · Biomass energy · Upstream expansion of the Pan European model for biomass and crops · Basic elements in a crop model for Denmark· Basic elements

455

An isospin dependent global nucleon-nucleus optical model at intermediate energies  

E-Print Network [OSTI]

A global nucleon-nucleus optical potential for elastic scattering has been produced which replicates experimental data to high accuracy and compares well with other recently formulated potentials. The calculation that has been developed describes proton and neutron scattering from target nuclei ranging from carbon to nickel and is applicable for projectile energies from 30 to 160 MeV. With these ranges it is suitable for calculations associated with experiments performed by exotic beam accelerators. The potential is also isospin dependent and has both real and imaginary isovector asymmetry terms to better describe the dynamics of chains of isotopes and mirror nuclei. An analysis of the validity and strength of the asymmetry term is included with connections established to other optical potentials and charge-exchange reaction data. An on-line observable calculator is available for this optical potential.

S. P. Weppner; R. B. Penney; G. W. Diffendale; G. Vittorini

2014-03-04T23:59:59.000Z

456

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

457

Automated Office Systems Support (AOSS) Quality Assurance Model...  

Broader source: Energy.gov (indexed) [DOE]

assurance model, including checklists, for activity relative to network and desktop computer support. Automated Office Systems Support (AOSS) Quality Assurance Model More...

458

Effective reuse of coupling technologies for Earth System Models.  

E-Print Network [OSTI]

??Designing and implementing coupled Earth System Models (ESMs) is a challenge for climate scientists and software engineers alike. Coupled models incorporate two or more independent… (more)

Dunlap, Ralph S.

2013-01-01T23:59:59.000Z

459

Dynamic model order reduction for shipboard integrated power systems  

Science Journals Connector (OSTI)

The shipboard integrated power system is modeled by a system of differential-algebraic equations with dynamics having time constants varying from fractions of a second to several minutes. Control and simulation of naval shipboard power systems for different ... Keywords: electric ship, integrated power system, model order reduction, shipboard power system, singular perturbation

Sudipta Lahiri; Dagmar Niebur; Harry Kwatny; Gaurav Bajpai

2009-07-01T23:59:59.000Z

460

A Global Time-Dependent Model of Thunderstorm Electricity. Part I: Mathematical Properties of the Physical and Numerical Models  

Science Journals Connector (OSTI)

A time-dependent model that simulates the interaction of a thunderstorm with its electrical environment is introduced. The model solves the continuity equation of the Maxwell current density that includes conduction, displacement, and source ...

G. L. Browning; I. Tzur; R. G. Roble

1987-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "global system modeling" 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

Study of Low Global Warming Potential Refrigerants in Heat Pump System for Residential Applications.  

E-Print Network [OSTI]

??R410A is one of the major refrigerants used for air conditioning and heat pump systems in residential applications. It has zero ODP but its GWP… (more)

Barve, Atharva

2012-01-01T23:59:59.000Z

462

Development of an Implementation Plan for an Electronic Document Management System in a Global Engineering Firm  

E-Print Network [OSTI]

that these field surveys can also be used to determine (Smith 1997): usage patterns level of training required operating environment security constraints and other factors that may affect development and deployment of the system Robert N. Kisuve... and Training PowerPoint/Video System Z Briefing 10/02/09 – Project Navigation PowerPoint/Video System Z Briefing 10/09/09 – Copy & Export PowerPoint/Video System Z Briefing 10/16/09 – 2009-2011 Deployment Plan PowerPoint/Video ProjectWise Environments Power...

Kisuve, Robert N.

2011-05-20T23:59:59.000Z

463

MODELING VENTILATION SYSTEM RESPONSE TO FIRE  

SciTech Connect (OSTI)

Fires in facilities containing nuclear material have the potential to transport radioactive contamination throughout buildings and may lead to widespread downwind dispersal threatening both worker and public safety. Development and implementation of control strategies capable of providing adequate protection from fire requires realistic characterization of ventilation system response which, in turn, depends on an understanding of fire development timing and suppression system response. This paper discusses work in which published HEPA filter data was combined with CFAST fire modeling predictions to evaluate protective control strategies for a hypothetical DOE non-reactor nuclear facility. The purpose of this effort was to evaluate when safety significant active ventilation coupled with safety class passive ventilation might be a viable control strategy.

Coutts, D

2007-04-17T23:59:59.000Z

464

CliCrop: a Crop Water-Stress and Irrigation Demand Model for an Integrated Global Assessment Model Approach  

E-Print Network [OSTI]

This paper describes the use of the CliCrop model in the context of climate change general assessment

Fant, C.A.

465

Linear amplifier model for optomechanical systems  

Science Journals Connector (OSTI)

We model optomechanical systems as linear optical amplifiers. This provides a unified treatment of diverse optomechanical phenomena. We emphasize, in particular, the relationship between ponderomotive squeezing and optomechanically induced transparency, two foci of current research. We characterize the amplifier response to quantum and applied classical fluctuations, both optical and mechanical. Further, we apply these results to establish quantum limits on external force sensing both on and off cavity resonance. We find that the maximum sensitivity attained on resonance constitutes an absolute upper limit, not surpassed when detuning off cavity resonance. The theory is extended to a two-sided cavity with losses and limited detection efficiency.

Thierry Botter; Daniel W. C. Brooks; Nathan Brahms; Sydney Schreppler; Dan M. Stamper-Kurn

2012-01-09T23:59:59.000Z

466

Cellular-automaton model for reactive systems  

Science Journals Connector (OSTI)

A method for constructing a variety of probabilistic lattice-gas cellular automata for chemically reacting systems is described. The microscopic reactive dynamics give rise to a general fourth-order polynomial rate law for the average particle density. The reduction of the microdynamical equations to a discrete or continuous Boltzmann equation is presented. Connection between the linearized Boltzmann equations and a reaction-diffusion macroscopic equation is discussed. As an example of the general formalism a set of cellular automata rules that yield the Schlögl phenomenological model is constructed. Simulation results are presented.

David Dab; Anna Lawniczak; Jean-Pierre Boon; Raymond Kapral

1990-05-14T23:59:59.000Z

467

Cryogenic system for ITER CS model coil  

SciTech Connect (OSTI)

A 5-kW/4.5-K helium refrigerator has been developed, which will be used for the test of ITER Central Solenoid Model Coil that is under fabrication by an international collaboration under the framework of the ITER Engineering Design Activity. Its acceptance test was recently finished and its specified refrigeration power of 5 kW with a surplus liquefaction rate of 114 1/h was demonstrated. A major feature of the refrigerator is that newly developed components, such as helium compressor and turbo-expander, are adopted in its simple refrigeration process in order that the results will be transferred to the ITER helium cryogenic system.

Kato, T.; Hamada, K.; Kawano, K.; Hiyama, T. [JAERI, Naka Fusion Research Establishment, Nada-machi, Nada-gun, Ibaraki-ken (Japan)] [and others

1996-12-31T23:59:59.000Z

468

Modeling of Diesel Exhaust Systems: A methodology to better simulate...  

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

of Diesel Exhaust Systems: A methodology to better simulate soot reactivity Modeling of Diesel Exhaust Systems: A methodology to better simulate soot reactivity Discussed...

469

A Global Interactive Chemistry and Climate Model Chien Wang, Ronald G. Prinn and Andrei P. Sokolov  

E-Print Network [OSTI]

with calculated or estimated trace gas emissions from both anthropogenic and natural sources, it is designed to the chemistry sub-model. Model predictions of the surface trends of several key species are close, if the current increasing trends of anthropogenic emissions of climate-relevant gases are continued over the next

470

A parametrized solid earth tide model and ocean tide loading effects for global geodetic baseline measurements  

Science Journals Connector (OSTI)

......Basing the tide response model on a frequency spectrum of...mean activation energy. 2.3 Implementation...This requires storage of long arrays...containing the frequencies of the J most...basis of the (frequency domain) response model. In application......

H.-G. Scherneck

1991-09-01T23:59:59.000Z

471

Analysis of the singular vectors of the full-physics FSU Global Spectral Model  

E-Print Network [OSTI]

for the numerical weather prediction models has been the subject of numerous studies. For the barotropic atmosphere-growth estimation in numerical weather prediction and atmospheric predictability (Molteni and Palmer, 1993 predictability of an idealized model. However, singular vector analysis was carried out for the realistic meteo

Aluffi, Paolo

472

An Improved Land Surface Emissivity Parameter for Land Surface Models Using Global Remote Sensing Observations  

E-Print Network [OSTI]

Observations MENGLIN JIN Department of Atmospheric and Oceanic Science, University of Maryland, College Park Oceanic and Atmospheric Administration (NOAA) National Centers for Environmental Prediction (NCEP) model that the assumption of the constant emissivity induces errors in modeling the surface energy budget, especially over

Liang, Shunlin

473

Existence and Global Convergence of Periodic Solutions in Recurrent Neural Network Models with a General Piecewise Alternately Advanced and Retarded Argument  

Science Journals Connector (OSTI)

This paper is concerned with existence, uniqueness and global exponential stability of a periodic solution for recurrent neural network described by a system of differential equations with piecewise constant argument of generalized type (in short DEPCAG). ... Keywords: 34A36, 34K13, 34K20, 92B20, Asymptotic stability, Global exponential stability, Periodic solutions, Piecewise constant argument of generalized type, Recurrent neural networks

Kuo-Shou Chiu, Manuel Pinto, Jyh-Cheng Jeng

2014-10-01T23:59:59.000Z

474

Historical and idealized model experiments: an intercomparison of Earth system models of  

E-Print Network [OSTI]

Historical and idealized model experiments: an intercomparison of Earth system models: an intercomparison of Earth system models of intermediate complexity M. Eby1, A. J. Weaver1, K. Alexander1, K

475

Scanning the Issue/Technology Special Issue on Global Positioning System  

E-Print Network [OSTI]

was a secondary objective. On the basis of national security considerations, the civil users of GPS have been the basic concepts and vocabulary needed for the papers which follow. GPS is not the first satellite Navigation Satellite System [1]. This system, better known as Transit, was based on a novel concept

Han, Richard Y.

476

Generation of baroclinic tide energy in a global three-dimensional numerical model with different spatial grid resolutions  

Science Journals Connector (OSTI)

Abstract We examine the global distribution of energy conversion rates from barotropic to baroclinic tides using a hydrostatic sigma-coordinate numerical model with a special attention to the dependence on the model grid resolution as well as the model topography resolution. A series of numerical experiments shows that the baroclinic tidal energy conversion rate increases almost exponentially with the decrease of the horizontal grid spacing, namely, from 1/5° to 1/20°. The baroclinic tidal energy conversion rates for the semidiurnal tidal constituents (M2, S2) are more sensitive to the horizontal grid spacing than those for the diurnal tidal constituents (K1, O1), reflecting the difference of their horizontal wavelengths. The sensitivity of the baroclinic tidal energy conversion rate to the horizontal grid spacing is also dependent on the generation sites of baroclinic tides; it becomes very sensitive in the regions characterized by geologically young seafloor having numerous small-scale rough topographic features such as the Mid-Atlantic Ridges, the eastern Pacific Ridges, and the Mid-Indian Ocean Ridges, whereas it is less sensitive in the regions such as the Indonesian Archipelago, and the western Pacific Ocean. The difference of the sensitivity can be best explained in terms of the value of the forcing function that is proportional to the square of the vertical velocity caused by barotropic tidal currents interacting with high-pass filtered bottom topography. Using the extrapolated value of the forcing function that takes into account all the topographic features generating baroclinic tides, we present the global distribution of the baroclinic tidal energy conversion rates in the limit of zero horizontal grid spacing.

Yoshihiro Niwa; Toshiyuki Hibiya

2014-01-01T23:59:59.000Z

477

Direct Insertion of MODIS Radiances in a Global Aerosol Transport Model CLARK WEAVER,* ARLINDO DA SILVA, MIAN CHIN,# PAUL GINOUX,@ OLEG DUBOVIK,&,@@  

E-Print Network [OSTI]

is directly inserted into the Goddard Chemistry and Aerosol Radiation Transport model (GOCART), which aerosol radiative forcing in the thermody- namic equation of GCMs, 3) to account for the reduc- tionDirect Insertion of MODIS Radiances in a Global Aerosol Transport Model CLARK WEAVER,* ARLINDO DA

Chin, Mian

478

Global Climate Change Links  

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

Global Climate Change Links Global Climate Change Links This page provides links to web pages that we at CDIAC feel do a responsible job of presenting information and discussion pertinent to the science behind the global climate change ("global warming") debate. These sites include those on both sides of the debate; some asserting that global warming is a clear and present danger, and others that might be labeled global warming "skeptics." Some of these sites don't take a position per se; they exist to offer the public objective scientific information and results on our present understanding of the climate system. The list is not intended to be comprehensive, by any means. We hope it will be especially helpful for those who may be just beginning their research into global

479

The Grid ENabled Integrated Earth System Modelling (GENIE) Framework  

Science Journals Connector (OSTI)

The Grid ENabled Integrated Earth system modelling (GENIE) framework is designed: (i) ... (ii) to tune and execute the resulting Earth system models on a wide variety of platforms including...

Tim Lenton

2013-01-01T23:59:59.000Z

480

Community Earth System Modeling Tutorial 12-16 July 2010  

E-Print Network [OSTI]

Community Earth System Modeling Tutorial 12-16 July 2010 National Center for Atmospheric Research, Boulder, CO APPLICATION DEADLINE: 15 April 2010 The Community Earth System Model (CESM) project

Note: This page contains sample records for the topic "global system modeling" 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

Modeling Topaz-II system performance  

SciTech Connect (OSTI)

The US acquisition of the Topaz-11 in-core thermionic space reactor test system from Russia provides a good opportunity to perform a comparison of the Russian reported data and the results from computer codes such as MCNP (Ref. 3) and TFEHX (Ref. 4). The comparison study includes both neutronic and thermionic performance analyses. The Topaz II thermionic reactor is modeled with MCNP using actual Russian dimensions and parameters. The computation of the neutronic performance considers several important aspects such as the fuel enrichment and location of the thermionic fuel elements (TFES) in the reactor core. The neutronic analysis included the calculation of both radial and axial power distribution, which are then used in the TFEHX code for electrical performance. The reactor modeled consists of 37 single-cell TFEs distributed in a 13-cm-radius zirconium hydride block surrounded by 8 cm of beryllium metal reflector. The TFEs use 90% enriched [sup 235]U and molybdenum coated with a thin layer of [sup 184]W for emitter surface. Electrons emitted are captured by a collector surface with a gap filled with cesium vapor between the collector and emitter surfaces. The collector surface is electrically insulated with alumina. Liquid NaK provides the cooling system for the TFEs. The axial thermal power distribution is obtained by dividing the TFE into 40 axial nodes. Comparison of the true axial power distribution with that produced by electrical heaters was also performed.

Lee, H.H.; Klein, A.C. (Oregon State Univ., Corvallis (United States))

1993-01-01T23:59:59.000Z

482

Computer Assisted 'Proof' of the Global Existence of Periodic Orbits in the Rössler System  

E-Print Network [OSTI]

The numerical optimized shooting method for finding periodic orbits in nonlinear dynamical systems was employed to determine the existence of periodic orbits in the well-known R\\"ossler system. By optimizing the period $T$ and the three system parameters, $a$, $b$ and $c$, simultaneously, it was found that, for any initial condition $(x_0,y_0,z_0) \\in \\Re^3$, there exists at least one set of optimized parameters corresponding to a periodic orbit passing through $ (x_0,y_0,z_0)$. After a discussion of this result it was concluded that its analytical proof may present an interesting new mathematical challenge.

A. E. Botha; W. Dednam

2014-08-14T23:59:59.000Z

483

Applied Ethics and ICT-Systems in Health Care Copyright 2008, IGI Global. Copying or distributing in print or electronic forms without written permission  

E-Print Network [OSTI]

Applied Ethics and ICT-Systems in Health Care Copyright © 2008, IGI Global. Copying or distributing Ethics and ICT-Systems in Health Care* Göran Collste, Linköping University, Sweden Abstract What are the ethical implications of information and communication technology in health care and how can new ICT

Zhao, Yuxiao

484

Global scheduling on temperature-constrained multiprocessor real-time systems  

E-Print Network [OSTI]

In this thesis, we study temperature-constrained multiprocessor real-time systems, where real-time guarantees must be met without exceeding safe temperature levels within the processors. We focus on Pfair scheduling algorithms, especially ERfair...

Koo, Ja-Ryeong

2008-10-10T23:59:59.000Z

485

Global early warning systems for natural hazards: systematic and people-centred  

Science Journals Connector (OSTI)

...complex socio-political emergencies...personal health risks and many other...those most at risk at a local level...capture and sustain political commitment, to...knowledge, to assess risks and manage investments in systems, to...

2006-01-01T23:59:59.000Z

486

A SYSTEMS APPROACH TO MATHEMATICAL MODELING OF INDUSTRIAL PROCESSES  

E-Print Network [OSTI]

/or partial automation of the creative modeling process. Model Generation is a new modeling paradigm designed specifically for rapid modeling of large multi-scale systems in the industrial practice. It proposes model. Keywords: Dynamic and continuous/discrete simulation, computer-aided modeling, symbolic

Linninger, Andreas A.

487

Design of Total Runoff Integrating Pathways (TRIP)—A Global River Channel Network  

Science Journals Connector (OSTI)

As a first step toward designing a comprehensive model for validating land surface hydrology and river flow in Earth system models, a global river channel network has been prepared at 1° latitude × 1° longitude resolution. The end product is the ...

Taikan Oki; Y. C. Sud

1998-01-01T23:59:59.000Z

488

Viable System Model approach for holonic product-driven manufacturing systems  

E-Print Network [OSTI]

Viable System Model approach for holonic product-driven manufacturing systems Carlos Herrera , Sana Control Systems (PDCS) dealing with production planning and control. The framework is based on Viable approach. Keywords: Product-driven systems, intelligent manufacturing systems, viable system model

Boyer, Edmond

489

A model and framework for reliable build systems Derrick Coetzee  

E-Print Network [OSTI]

A model and framework for reliable build systems Derrick Coetzee Anand Bhaskar George Necula, requires prior specific permission. #12;A model and framework for reliable build systems Derrick Coetzee- distributed, incremental, parallel build systems. We de- fine a general model for resources accessed by build

Necula, George

490

Multi-objective optimization of GENIE Earth system models  

Science Journals Connector (OSTI)

...Multi-objective optimization of GENIE Earth system models Andrew R. Price 1 * Richard...execution and management of Earth system models (ESMs) capable of simulation...Multiobjective tuning of Grid-enabled Earth system models using a non-dominated sorting...

2009-01-01T23:59:59.000Z

491

Traffic flow models and service rules for complex production systems  

E-Print Network [OSTI]

Traffic flow models and service rules for complex production systems C. Ringhofer Abstract We emphasis is given to the implementation of service rules for complex systems, involving multiple product flow type models for complex production systems. Traffic flow models represent, in some sense

Ringhofer, Christian

492

The National Energy Modeling System: An Overview 1998 - Appendix:  

Gasoline and Diesel Fuel Update (EIA)

APPENDIX: APPENDIX: BIBLIOGRAPHY The National Energy Modeling System is documented in a series of model documentation reports, available by contacting the National Energy Information Center (202/586-8800). Energy Information Administration, National Energy Modeling System Integrating Module Documentation Report, DOE/EIA-M057(97) (Washington, DC, May 1997). Energy Information Administration, Model Documentation Report: Macroeconomic Activity Module (MAM) of the National Energy Modeling System, DOE/EIA-M065(97) (Washington, DC, December 1996). Energy Information Administration, Model Developer's Appendix to the Model Documentation Report: NEMS Macroeconomic Activity Module, DOE/EIA-M065A (Washington, DC, July 1994). Energy Information Administration, Documentation of the DRI Model of the

493

Integrated Assessment of Global Climate Change | U.S. DOE Office of Science  

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

Integrated Assessment of Global Integrated Assessment of Global Climate Change Biological and Environmental Research (BER) BER Home About Research Research Abstracts Searchable Archive of BER Highlights External link Biological Systems Science Division (BSSD) Climate and Environmental Sciences Division (CESD) ARM Climate Research Facility Atmospheric System Research (ASR) Program Data Management Earth System Modeling (ESM) Program William R. Wiley Environmental Molecular Sciences Laboratory (EMSL) Integrated Assessment of Global Climate Change Regional & Global Climate Modeling (RGCM) Program Subsurface Biogeochemical Research Terrestrial Carbon Sequestration External link Terrestrial Ecosystem Science Facilities Science Highlights Benefits of BER Funding Opportunities Biological & Environmental Research Advisory Committee (BERAC)

494

Observed Scaling in Clouds and Precipitation and Scale Incognizance in Regional to Global Atmospheric Models  

SciTech Connect (OSTI)

We use observations of robust scaling behavior in clouds and precipitation to derive constraints on how partitioning of precipitation should change with model resolution. Our analysis indicates that 90-99% of stratiform precipitation should occur in clouds that are resolvable by contemporary climate models (e.g., with 200 km or finer grid spacing). Furthermore, this resolved fraction of stratiform precipitation should increase sharply with resolution, such that effectively all stratiform precipitation should be resolvable above scales of ~50 km. We show that the Community Atmosphere Model (CAM) and the Weather Research and Forecasting (WRF) model also exhibit the robust cloud and precipitation scaling behavior that is present in observations, yet the resolved fraction of stratiform precipitation actually decreases with increasing model resolution. A suite of experiments with multiple dynamical cores provides strong evidence that this `scale-incognizant' behavior originates in one of the CAM4 parameterizations. An additional set of sensitivity experiments rules out both convection parameterizations, and by a process of elimination these results implicate the stratiform cloud and precipitation parameterization. Tests with the CAM5 physics package show improvements in the resolution-dependence of resolved cloud fraction and resolved stratiform precipitation fraction.

O'Brien, Travis A.; Li, Fuyu; Collins, William D.; Rauscher, Sara; Ringler, Todd; Taylor, Mark; Hagos, Samson M.; Leung, Lai-Yung R.

2013-12-01T23:59:59.000Z

495

Generic Disposal System Modeling, Fiscal Year 2011 Progress Report |  

Broader source: Energy.gov (indexed) [DOE]

Disposal System Modeling, Fiscal Year 2011 Progress Report Disposal System Modeling, Fiscal Year 2011 Progress Report Generic Disposal System Modeling, Fiscal Year 2011 Progress Report The UFD Campaign is developing generic disposal system models (GDSM) of different disposal environments and waste form options. Currently, the GDSM team is investigating four main disposal environment options: mined repositories in three geologic media (salt, clay, and granite) and the deep borehole concept in crystalline rock (DOE 2010d). Further developed the individual generic disposal system (GDS) models for salt, granite, clay, and deep borehole disposal environments. GenericDisposalSystModelFY11.pdf More Documents & Publications Integration of EBS Models with Generic Disposal System Models TSPA Model Development and Sensitivity Analysis of Processes Affecting

496

Model documentation report: Transportation sector model of the National Energy Modeling System  

SciTech Connect (OSTI)

This report documents the objectives, analytical approach and development of the National Energy Modeling System (NEMS) Transportation Model (TRAN). The report catalogues and describes the model assumptions, computational methodology, parameter estimation techniques, model source code, and forecast results generated by the model. This document serves three purposes. First, it is a reference document providing a detailed description of TRAN for model analysts, users, and the public. Second, this report meets the legal requirements of the Energy Information Administration (EIA) to provide adequate documentation in support of its statistical and forecast reports (Public Law 93-275, 57(b)(1)). Third, it permits continuity in model development by providing documentation from which energy analysts can undertake model enhancements, data updates, and parameter refinements.

Not Available

1994-03-01T23:59:59.000Z

497

Modeling and optimization of building HVAC systems.  

E-Print Network [OSTI]

??This thesis presents the development of hybrid modeling methodologies for HVAC component static/steady-state models and dynamic/transient models, and the development and implementation of a model-based… (more)

Jin, Guang Yu.

2012-01-01T23:59:59.000Z

498

Irreversible Thermodynamics and Smart Materials Systems Modelling. Example of  

E-Print Network [OSTI]

Irreversible Thermodynamics and Smart Materials Systems Modelling. Example of Magnetic Shape Memory mechanisms in smart materials. This procedure is applied to Magnetic Shape Memory Alloys actuators of complex active materials for smart systems. Keywords: Smart material systems, Actuator design