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1

Validated Models for Radiation Response and Signal Generation in Scintillators: Final Report  

SciTech Connect (OSTI)

This Final Report presents work carried out at Pacific Northwest National Laboratory (PNNL) under the project entitled “Validated Models for Radiation Response and Signal Generation in Scintillators” (Project number: PL10-Scin-theor-PD2Jf) and led by Drs. Fei Gao and Sebastien N. Kerisit. This project was divided into four tasks: 1) Electronic response functions (ab initio data model) 2) Electron-hole yield, variance, and spatial distribution 3) Ab initio calculations of information carrier properties 4) Transport of electron-hole pairs and scintillation efficiency Detailed information on the results obtained in each of the four tasks is provided in this Final Report. Furthermore, published peer-reviewed articles based on the work carried under this project are included in Appendix. This work was supported by the National Nuclear Security Administration, Office of Nuclear Nonproliferation Research and Development (DNN R&D/NA-22), of the U.S. Department of Energy (DOE).

Kerisit, Sebastien N.; Gao, Fei; Xie, YuLong; Campbell, Luke W.; Van Ginhoven, Renee M.; Wang, Zhiguo; Prange, Micah P.; Wu, Dangxin

2014-12-01T23:59:59.000Z

2

Modeling the effects of demand response on generation expansion planning in restructured power systems  

Science Journals Connector (OSTI)

Demand response is becoming a promising field of study ... . More attention has recently been paid to demand response programs. Customers can contribute to the operation of power systems by deployment demand response

Mahdi Samadi; Mohammad Hossein Javidi…

2013-12-01T23:59:59.000Z

3

Dynamic Whitelist Generation for Automated Response  

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

Methodology Methodology Results Dynamic Whitelist Generation for Automated Response Chris Strasburg, Josh Adams Ames Laboratory, US DOE cstras@ameslab.gov, jadams@ameslab.gov The Ames Laboratory, US DOE 1 Dynamic Whitelist Generation for Automated Response Introduction Methodology Results Outline 1 Introduction About Ames Laboratory Motivation 2 Methodology Data Classifiers Experiments 3 Results The Ames Laboratory, US DOE 2 Dynamic Whitelist Generation for Automated Response Introduction Methodology Results About Ames Laboratory Motivation Ames Physical Environment The Ames Laboratory, US DOE 3 Dynamic Whitelist Generation for Automated Response Introduction Methodology Results About Ames Laboratory Motivation Ames Network Environment The Ames Laboratory, US DOE 4 Dynamic Whitelist Generation for Automated Response Introduction Methodology Results About Ames

4

Next Generation Calibration Models with Dimensional Modeling...  

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

Documents & Publications Reduction of Transient Particulate Matter Spikes with Decision Tree Based Control Model-Based Transient Calibration Optimization for Next Generation Diesel...

5

Improving Dynamic Load and Generator Response Performance Tools  

E-Print Network [OSTI]

induction motors that Improving Dynamic Load and Generatorand Generator Response Performance Tools Another important example reported in the literature, also involving inductionand Generator Response Performance Tools As partial answers to these questions we note that the 20% induction

Lesieutre, Bernard C.

2005-01-01T23:59:59.000Z

6

Evaluation of wave energy generation from buoy heave response based on linear generator concepts  

Science Journals Connector (OSTI)

Previous studies of linear generator power extraction from ocean waves have usually ignored the buoy heave dynamics and taken the linear generator movement to coincide with the wave motion. Here the actual buoy motion is first determined and then used to solve the coupled hydrodynamic and electromagnetic problem of electrical power generation for both regular and irregular waves. Several buoy sizes are modeled to exploit the buoys' natural frequency in an attempt to create a greater heave response for a given sea state. Power output ranging from 75 to 375?W is predicted for the dimensions chosen.

M. A. Stelzer; R. P. Joshi

2012-01-01T23:59:59.000Z

7

A benchmark diagnostic model generation system  

Science Journals Connector (OSTI)

It is critical to use automated generators for synthetic models and data given the sparsity of benchmark models for empirical analysis and the cost of generating models by hand. We describe an automated generator for benchmark models that is based on ... Keywords: benchmark model generation, compositional modeling, diagnosis

Jun Wang; Gregory Provan

2010-05-01T23:59:59.000Z

8

Current responsive devices for synchronous generators  

DOE Patents [OSTI]

A device for detecting current imbalance between phases of a polyphase alternating current generator. A detector responds to the maximum peak current in the generator, and detecting means generates an output for each phase proportional to the peak current of each phase. Comparing means generates an output when the maximum peak current exceeds the phase peak current.

Karlicek, Robert F. (Fullerton, CA)

1983-01-01T23:59:59.000Z

9

Improving Dynamic Load and Generator Response PerformanceTools  

SciTech Connect (OSTI)

This report is a scoping study to examine research opportunities to improve the accuracy of the system dynamic load and generator models, data and performance assessment tools used by CAISO operations engineers and planning engineers, as well as those used by their counterparts at the California utilities, to establish safe operating margins. Model-based simulations are commonly used to assess the impact of credible contingencies in order to determine system operating limits (path ratings, etc.) to ensure compliance with NERC and WECC reliability requirements. Improved models and a better understanding of the impact of uncertainties in these models will increase the reliability of grid operations by allowing operators to more accurately study system voltage problems and the dynamic stability response of the system to disturbances.

Lesieutre, Bernard C.

2005-11-01T23:59:59.000Z

10

FlexibleSUSY -- A spectrum generator generator for supersymmetric models  

E-Print Network [OSTI]

We introduce FlexibleSUSY, a Mathematica and C++ package, which generates a fast, precise C++ spectrum generator for any SUSY model specified by the user. The generated code is designed with both speed and modularity in mind, making it easy to adapt and extend with new features. The model is specified by supplying the superpotential, gauge structure and particle content in a SARAH model file; specific boundary conditions e.g. at the GUT, weak or intermediate scales are defined in a separate FlexibleSUSY model file. From these model files, FlexibleSUSY generates C++ code for self-energies, tadpole corrections, renormalization group equations (RGEs) and electroweak symmetry breaking (EWSB) conditions and combines them with numerical routines for solving the RGEs and EWSB conditions simultaneously. The resulting spectrum generator is then able to solve for the spectrum of the model, including loop-corrected pole masses, consistent with user specified boundary conditions. The modular structure of the generated co...

Athron, Peter; Stöckinger, Dominik; Voigt, Alexander

2014-01-01T23:59:59.000Z

11

Optimal combined scheduling of generation and demand response with demand resource constraints  

Science Journals Connector (OSTI)

Demand response (DR) extends customer participation to power systems and results in a paradigm shift from simplex to interactive operation in power systems due to the advancement of smart grid technology. Therefore, it is important to model the customer characteristics in DR. This paper proposes customer information as the registration and participation information of DR, thus providing indices for evaluating customer response, such as DR magnitude, duration, frequency and marginal cost. The customer response characteristics are modeled from this information. This paper also introduces the new concept of virtual generation resources, whose marginal costs are calculated in the same manner as conventional generation marginal costs, according to customer information. Finally, some of the DR constraints are manipulated and expressed using the information modeled in this paper with various status flags. Optimal scheduling, combined with generation and DR, is proposed by minimizing the system operation cost, including generation and DR costs, with the generation and DR constraints developed in this paper.

Hyung-Geun Kwag; Jin-O Kim

2012-01-01T23:59:59.000Z

12

Pseudoabsence Generation Strategies for Species Distribution Models  

E-Print Network [OSTI]

Pseudoabsence Generation Strategies for Species Distribution Models Brice B. Hanberry1 *, Hong S: Pseudoabsence generation strategy completely affected the area predicted as present for species distribution) Pseudoabsence Generation Strategies for Species Distribution Models. PLoS ONE 7(8): e44486. doi:10.1371/ journal

He, Hong S.

13

NREL: Transmission Grid Integration - Generator Modeling  

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

Generator Modeling Generator Modeling NREL works with the solar and wind industries to provide utilities and grid operators with generator models to help them analyze the impact of variable generation on power system performance and reliability. As the amount of variable generation increases, the need for such models increases. Ensuring the models are as generic as possible allows for ease of use, model validation, data exchange, and analysis. To address this need, NREL researchers are developing generic dynamic models of wind and solar power plants. NREL's dynamic modeling efforts include: Collecting wind plant output data with corresponding wind resource data (speed, direction, and air density) from meteorological towers and performing multivariate analysis of the data to develop an equivalent wind

14

Aircraft Power Generators: Hybrid Modeling and  

E-Print Network [OSTI]

Aircraft Power Generators: Hybrid Modeling and Simulation for Fault Detection ASHRAF TANTAWY University Integrated drive generators (IDGs) are the main source of electrical power for a number, and a majority of the existing FDI techniques for the electrical subsystem (brushless generator) are based

Koutsoukos, Xenofon D.

15

Ormolu : generating runtime monitors from alloy models  

E-Print Network [OSTI]

This thesis presents Ormolu, a runtime monitor used for monitoring distributed systems. Given an Alloy model, Ormolu generates a database schema and translates the constraints of the model to queries over the database. The ...

Reeves, Dwayne Lloyd

2011-01-01T23:59:59.000Z

16

Mass Market Demand Response and Variable Generation Integration Issues: A Scoping Study  

E-Print Network [OSTI]

Goldman, G. (2009) Retail demand response in Southwest PowerCoordination of retail demand response with Midwest ISO2010. 110 pages. Demand Response and Variable Generation

Cappers, Peter

2012-01-01T23:59:59.000Z

17

Modeling Operational Constraints imposed by Renewable Generation  

E-Print Network [OSTI]

investments on ­ Generation, Transmission ­ Fuel & Transportation infrastructure · Capacity · Location · Year Regulation data and Net Load change data ­ ex: ERCOT 2. Function of variability in (Net load + Generation schedule + Tie line frequency) · ex: CAISO, NREL, Xcel MN & Wind Logics 3. Fit regression model

Daniels, Thomas E.

18

Modeling distributed generation in the buildings sectors  

Gasoline and Diesel Fuel Update (EIA)

Modeling distributed generation Modeling distributed generation in the buildings sectors August 2013 Independent Statistics & Analysis www.eia.gov U.S. Department of Energy Washington, DC 20585 U.S. Energy Information Administration | Modeling distributed generation in the buildings sectors i This report was prepared by the U.S. Energy Information Administration (EIA), the statistical and analytical agency within the U.S. Department of Energy. By law, EIA's data, analyses, and forecasts are independent of approval by any other officer or employee of the United States Government. The views in this report therefore should not be construed as representing those of the Department of Energy or other Federal agencies. July 2013 U.S. Energy Information Administration | Modeling distributed generation in the buildings sectors 1

19

Modelling hadronic interactions in HEP MC generators  

E-Print Network [OSTI]

HEP event generators aim to describe high-energy collisions in full exclusive detail. They combine perturbative matrix elements and parton showers with dynamical models of less well-understood phenomena such as hadronization, diffraction, and the so-called underlying event. We briefly summarise some of the main concepts relevant to the modelling of soft/inclusive hadron interactions in MC generators, in particular PYTHIA, with emphasis on questions recently highlighted by LHC data.

Skands, Peter

2014-01-01T23:59:59.000Z

20

Mass Market Demand Response and Variable Generation Integration Issues: A  

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

Mass Market Demand Response and Variable Generation Integration Issues: A Mass Market Demand Response and Variable Generation Integration Issues: A Scoping Study Title Mass Market Demand Response and Variable Generation Integration Issues: A Scoping Study Publication Type Report Refereed Designation Unknown Year of Publication 2011 Authors Cappers, Peter, Andrew D. Mills, Charles A. Goldman, Ryan H. Wiser, and Joseph H. Eto Pagination 76 Date Published 10/2011 Publisher LBNL City Berkeley Keywords demand response, electricity markets and policy group, energy analysis and environmental impacts department, renewable generation integration, smart grid Abstract The penetration of renewable generation technology (e.g., wind, solar) is expected to dramatically increase in the United States during the coming years as many states are implementing policies to expand this sector through regulation and/or legislation. It is widely understood, though, that large scale deployment of certain renewable energy sources, namely wind and solar, poses system integration challenges because of its variable and often times unpredictable production characteristics (NERC, 2009). Strategies that rely on existing thermal generation resources and improved wind and solar energy production forecasts to manage this variability are currently employed by bulk power system operators, although a host of additional options are envisioned for the near future. Demand response (DR), when properly designed, could be a viable resource for managing many of the system balancing issues associated with integrating large-scale variable generation (VG) resources (NERC, 2009). However, demand-side options would need to compete against strategies already in use or contemplated for the future to integrate larger volumes of wind and solar generation resources. Proponents of smart grid (of which Advanced Metering Infrastructure or AMI is an integral component) assert that the technologies associated with this new investment can facilitate synergies and linkages between demand-side management and bulk power system needs. For example, smart grid proponents assert that system-wide implementation of advanced metering to mass market customers (i.e., residential and small commercial customers) as part of a smart grid deployment enables a significant increase in demand response capability.1 Specifically, the implementation of AMI allows electricity consumption information to be captured, stored and utilized at a highly granular level (e.g., 15-60 minute intervals in most cases) and provides an opportunity for utilities and public policymakers to more fully engage electricity customers in better managing their own usage through time-based rates and near-real time feedback to customers on their usage patterns while also potentially improving the management of the bulk power system. At present, development of time-based rates and demand response programs and the installation of variable generation resources are moving forward largely independent of each other in state and regional regulatory and policy forums and without much regard to the complementary nature of their operational characteristics.2 By 2020, the electric power sector is expected to add ~65 million advanced meters3 (which would reach ~47% of U.S. households) as part of smart grid and AMI4 deployments (IEE, 2010) and add ~40-80 GW of wind and solar capacity (EIA, 2010). Thus, in this scoping study, we focus on a key question posed by policymakers: what role can the smart grid (and its associated enabling technology) play over the next 5-10 years in helping to integrate greater penetration of variable generation resources by providing mass market customers with greater access to demand response opportunities? There is a well-established body of research that examines variable generation integration issues as well as demand response potential, but the nexus between the two has been somewhat neglected by the industry. The studies that have been conducted are informative concerning what could be accomplished with strong broad-based support for the expansion of demand response opportunities, but typically do not discuss the many barriers that stand in the way of reaching this potential. This study examines how demand side resources could be used to integrate wind and solar resources in the bulk power system, identifies barriers that currently limit the use of demand side strategies, and suggests several factors that should be considered in assessing alternative strategies that can be employed to integrate wind and solar resources in the bulk power system. It is difficult to properly gauge the role that DR could play in managing VG integration issues in the near future without acknowledging and understanding the entities and institutions that govern the interactions between variable generation and mass market customers (see Figure ES-1). Retail entities, like load-serving entities (LSE) and aggregators of retail customers (ARC), harness the demand response opportunities of mass market customers through tariffs (and DR programs) that are approved by state regulatory agencies or local governing entities (in the case of public power). The changes in electricity consumption induced by DR as well as the changes in electricity production due to the variable nature of wind and solar generation technologies is jointly managed by bulk power system operators. Bulk power system operators function under tariffs approved by the Federal Energy Regulatory Commission (FERC) and must operate their systems in accordance with rules set by regional reliability councils. These reliability rules are derived from enforceable standards that are set by the North American Electric Reliability Corporation (NERC) and approved by federal regulators. Thus, the role that DR can play in managing VG integration issues is contingent on what opportunities state and local regulators are willing to approve and how customers' response to the DR opportunities can be integrated into the bulk power system both electrically (due to reliability rules) and financially (due to market rules).

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


21

Reliability modeling of demand response considering uncertainty of customer behavior  

Science Journals Connector (OSTI)

Abstract Demand response (DR) has been considered as a generation alternative to improve the reliability indices of the system and load point. However, when the demand resources scheduled in the DR market fail to result in demand reductions, it can potentially bring new problems associated with maintaining a reliable supply. In this paper, a reliability model of the demand resource is constructed considering customers’ behaviors in the same form as conventional generation units, where the availability and unavailability are associated with the simple two-state model. The reliability model is generalized by a multi-state model. In the integrated power market with DR, market players provide the demand reduction and generation, which are represented by an equivalent multi-state demand response and generation, respectively. The reliability indices of the system and load point are evaluated using the optimal power flow by minimizing the summation of load curtailments with various constraints.

Hyung-Geun Kwag; Jin-O Kim

2014-01-01T23:59:59.000Z

22

Demand Response and Variable Generation Integration Scoping Study  

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

Market and Policy Barriers for Demand Market and Policy Barriers for Demand Response Providing Ancillary Services in U.S. Electricity Markets Peter Cappers, Jason MacDonald, Charles Goldman April 2013 Report Summary 1 Energy Analysis Department  Electricity Markets and Policy Group Presentation Overview  Objectives and Approach  Wholesale and Retail Market Environments  Market and Policy Barrier Typology  Prototypical Regional Barrier Assessment 2 Energy Analysis Department  Electricity Markets and Policy Group A Role for Demand Response to Provide Ancillary Services  Increasing penetration of renewable energy generation in U.S. electricity markets means that bulk power system operators will need to manage the variable and uncertain nature of many renewable resources

23

Multi-physics modeling of thermoelectric generators for waste...  

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

Multi-physics modeling of thermoelectric generators for waste heat recovery applications Multi-physics modeling of thermoelectric generators for waste heat recovery applications...

24

Demonstrating and Validating a Next Generation Model-Based Controller...  

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

and Validating a Next Generation Model-Based Controller for Fuel Efficient, Low Emissions Diesel Engines Demonstrating and Validating a Next Generation Model-Based Controller for...

25

Modeling and Simulation Data Generation.pub  

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

Simulation Data Simulation Data Generation 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 Research Brief A n ORNL team supported the Rapid Data Generation (RDG) Project from 2009 to 2012. This work was performed for the Joint Training Integration and Evaluation Center and the Modeling and Simulation Coordination Office. The objective of RDG is to reduce the resources required to produce, integrate, and correlate data, eliminate or reduce duplicative efforts, and promote data commonality for modeling and simulation (M&S) activities across the Department of

26

Detailed Modeling and Response of Demand Response Enabled Appliances  

SciTech Connect (OSTI)

Proper modeling of end use loads is very important in order to predict their behavior, and how they interact with the power system, including voltage and temperature dependencies, power system and load control functions, and the complex interactions that occur between devices in such an interconnected system. This paper develops multi-state time variant residential appliance models with demand response enabled capabilities in the GridLAB-DTM simulation environment. These models represent not only the baseline instantaneous power demand and energy consumption, but the control systems developed by GE Appliances to enable response to demand response signals and the change in behavior of the appliance in response to the signal. These DR enabled appliances are simulated to estimate their capability to reduce peak demand and energy consumption.

Vyakaranam, Bharat; Fuller, Jason C.

2014-04-14T23:59:59.000Z

27

STELLOPT Modeling of the 3D Diagnostic Response in ITER  

SciTech Connect (OSTI)

The ITER three dimensional diagnostic response to an n=3 resonant magnetic perturbation is modeled using the STELLOPT code. The in-vessel coils apply a resonant magnetic perturbation (RMP) fi eld which generates a 4 cm edge displacement from axisymmetry as modeled by the VMEC 3D equilibrium code. Forward modeling of flux loop and magnetic probe response with the DIAGNO code indicates up to 20 % changes in measured plasma signals. Simulated LIDAR measurements of electron temperature indicate 2 cm shifts on the low field side of the plasma. This suggests that the ITER diagnostic will be able to diagnose the 3D structure of the equilibria.

Lazerson, Samuel A

2013-05-07T23:59:59.000Z

28

Mass Market Demand Response and Variable Generation Integration Issues: A Scoping Study  

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

Mass Market Demand Response and Mass Market Demand Response and Mass Market Demand Response and Mass Market Demand Response and Variable Generation Integration Issues: Variable Generation Integration Issues: Variable Generation Integration Issues: Variable Generation Integration Issues: A Scoping Study A Scoping Study Peter Cappers, Andrew Mills, Charles Goldman, Ryan Wiser, Joseph H. Eto Report Summary October 2011 Energy Analysis Department  Electricity Markets and Policy Group 1 1 Presentation Overview Presentation Overview  Objectives and Approach  Variable Generation Resources and the Bulk Power System  Demand Response Opportunities  Demand Response as a Strategy to Integrate p gy g Variable Generation Resources  Comparison of Various Strategies to Integrate Variable Generation  Conclusions Energy Analysis Department  Electricity Markets and Policy Group

29

Electric Water Heater Modeling and Control Strategies for Demand Response  

SciTech Connect (OSTI)

Abstract— Demand response (DR) has a great potential to provide balancing services at normal operating conditions and emergency support when a power system is subject to disturbances. Effective control strategies can significantly relieve the balancing burden of conventional generators and reduce investment on generation and transmission expansion. This paper is aimed at modeling electric water heaters (EWH) in households and tests their response to control strategies to implement DR. The open-loop response of EWH to a centralized signal is studied by adjusting temperature settings to provide regulation services; and two types of decentralized controllers are tested to provide frequency support following generator trips. EWH models are included in a simulation platform in DIgSILENT to perform electromechanical simulation, which contains 147 households in a distribution feeder. Simulation results show the dependence of EWH response on water heater usage . These results provide insight suggestions on the need of control strategies to achieve better performance for demand response implementation. Index Terms— Centralized control, decentralized control, demand response, electrical water heater, smart grid

Diao, Ruisheng; Lu, Shuai; Elizondo, Marcelo A.; Mayhorn, Ebony T.; Zhang, Yu; Samaan, Nader A.

2012-07-22T23:59:59.000Z

30

TOWARDS COMPUTER-AIDED MODEL GENERATION Keynote presentation at the  

E-Print Network [OSTI]

modeling process. Model Generation is a new modeling paradigm for rapid computer- aided model generation Phenomena-oriented modeling is a research initiative for the computer-aided support and partial automation of simulation environments, methodologies for the computer-aided support of the modeling activity itself have

Linninger, Andreas A.

31

Crowd modeling: generation of a fully articulated crowd of characters  

E-Print Network [OSTI]

In this thesis I present a fast, efficient, and production friendly method to generate a crowd of fully articulated characters. A wide variety of characters can be created from a relatively few base models. The models that are generated...

Swaminathan, Karthik

2006-04-12T23:59:59.000Z

32

Aircraft AC Generators: Hybrid System Modeling and Simulation  

E-Print Network [OSTI]

1 Aircraft AC Generators: Hybrid System Modeling and Simulation Ashraf Tantawy, Student Member--Integrated Drive Generators (IDGs) are the main source of electrical power for a number of critical systems is a difficult task. dq0 models have been developed for design and control of generators, but these models

Koutsoukos, Xenofon D.

33

Generation and Transmission Maximization Model | Open Energy Information  

Open Energy Info (EERE)

Generation and Transmission Maximization Model Generation and Transmission Maximization Model Jump to: navigation, search Tool Summary Name: Generation and Transmission Maximization Model Agency/Company /Organization: Argonne National Laboratory Sector: Energy Topics: Pathways analysis Resource Type: Software/modeling tools User Interface: Desktop Application Website: www.dis.anl.gov/projects/Gtmax.html Cost: Paid Generation and Transmission Maximization Model Screenshot References: Generation and Transmission Maximization Model [1] Logo: Generation and Transmission Maximization Model The GTMax model helps researchers study complex marketing and system operational issues. With the aid of this comprehensive model, utility operators and managers can maximize the value of the electric system, taking into account not only its limited energy and transmission resources,

34

Modeling generation and characterization of attosecond pulses  

E-Print Network [OSTI]

Generation of high-order harmonics has emerged as a powerful technique for the generation of broadband coherent radiation in the EUV regime. This has lead to the development of table-top EUV sources that can produce ...

Bhardwaj, Siddharth

2014-01-01T23:59:59.000Z

35

Value of Demand Response: Quantities from Production Cost Modeling (Presentation)  

SciTech Connect (OSTI)

Demand response (DR) resources present a potentially important source of grid flexibility particularly on future systems with high penetrations of variable wind and solar power generation. However, managed loads in grid models are limited by data availability and modeling complexity. This presentation focuses on the value of co-optimized DR resources to provide energy and ancillary services in a production cost model. There are significant variations in the availabilities of different types of DR resources, which affect both the operational savings as well as the revenue for each DR resource. The results presented include the system-wide avoided fuel and generator start-up costs as well as the composite revenue for each DR resource by energy and operating reserves. In addition, the revenue is characterized by the capacity, energy, and units of DR enabled.

Hummon, M.

2014-04-01T23:59:59.000Z

36

Towards modelling and design of magnetostrictive electric generators  

Science Journals Connector (OSTI)

The paper deals with application of giant magnetostrictive materials for power harvesting from vibration. Mathematical modelling and design of magnetostrictive electric generators (MEG) are considered. The mathematical model, original MEG and test rig ... Keywords: Electric generator, Magnetostriction, Modelling, Power harvesting, Terfenol-D, Vibration, Villari effect

Viktor Berbyuk; Jayesh Sodhani

2008-02-01T23:59:59.000Z

37

Automatic Digital Surface Model (DSM) Generation from Linear Array Images  

E-Print Network [OSTI]

Automatic Digital Surface Model (DSM) Generation from Linear Array Images A dissertation submitted-examiner Presented by Li Zhang Zurich 2005 #12;IGP Mitteilungen Nr. 88 Automatic Digital Surface Model (DSM-906467-55-4 #12;DISS. ETH NO. 16078 Automatic Digital Surface Model (DSM) Generation from Linear Array Images

Giger, Christine

38

Modeling the mechanical response of PBX 9501  

SciTech Connect (OSTI)

An engineering overview of the mechanical response of Plastic-Bonded eXplosives (PBXs), specifically PBX 9501, will be provided with emphasis on observed mechanisms associated with different types of mechanical testing. Mechanical tests in the form of uniaxial tension, compression, cyclic loading, creep (compression and tension), and Hopkinson bar show strain rate and temperature dependence. A range of mechanical behavior is observed which includes small strain recoverable response in the form of viscoelasticity; change in stiffness and softening beyond peak strength due to damage in the form microcracks, debonding, void formation and the growth of existing voids; inelastic response in the form of irrecoverable strain as shown in cyclic tests, and viscoelastic creep combined with plastic response as demonstrated in creep and recovery tests. The main focus of this paper is to elucidate the challenges and issues involved in modeling the mechanical behavior of PBXs for simulating thermo-mechanical responses in engineering components. Examples of validation of a constitutive material model based on a few of the observed mechanisms will be demonstrated against three point bending, split Hopkinson pressure bar and Brazilian disk geometry.

Ragaswamy, Partha [Los Alamos National Laboratory; Lewis, Matthew W [Los Alamos National Laboratory; Liu, Cheng [Los Alamos National Laboratory; Thompson, Darla G [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

39

Learning to model sequences generated by switching distributions Yoav Freund  

E-Print Network [OSTI]

Learning to model sequences generated by switching distributions Yoav Freund AT&T Bell Labs 600 distributions learning problem. A sequence S = oe 1 oe 2 : : : oe n , over a finite alphabet \\Sigma is generated run is generated by independent random draws from a distribution ~ p i over \\Sigma, where ~p i

Freund, Yoav

40

Generation of certifiably correct programs from formal models Alexei Iliasov  

E-Print Network [OSTI]

Generation of certifiably correct programs from formal models Alexei Iliasov Newcastle University techniques helps to deliver systems that are free from engineer- ing defects. A code generator quickly, consistently and reproducibly. Com- monly, a code generator is a program constructed informally

Southampton, University of

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


41

Generating Counterexamples for Structural Inductions by Exploiting Nonstandard Models  

E-Print Network [OSTI]

Generating Counterexamples for Structural Inductions by Exploiting Nonstandard Models Jasmin 2 Dept. of CSE, Chalmers University of Technology, Gothenburg, Sweden Abstract. Induction proofs the theorem or prove auxiliary properties before performing the induction step. (Counter)model finders

Cengarle, MarĂ­a Victoria

42

Distributed generation capabilities of the national energy modeling system  

SciTech Connect (OSTI)

This report describes Berkeley Lab's exploration of how the National Energy Modeling System (NEMS) models distributed generation (DG) and presents possible approaches for improving how DG is modeled. The on-site electric generation capability has been available since the AEO2000 version of NEMS. Berkeley Lab has previously completed research on distributed energy resources (DER) adoption at individual sites and has developed a DER Customer Adoption Model called DER-CAM. Given interest in this area, Berkeley Lab set out to understand how NEMS models small-scale on-site generation to assess how adequately DG is treated in NEMS, and to propose improvements or alternatives. The goal is to determine how well NEMS models the factors influencing DG adoption and to consider alternatives to the current approach. Most small-scale DG adoption takes place in the residential and commercial modules of NEMS. Investment in DG ultimately offsets purchases of electricity, which also eliminates the losses associated with transmission and distribution (T&D). If the DG technology that is chosen is photovoltaics (PV), NEMS assumes renewable energy consumption replaces the energy input to electric generators. If the DG technology is fuel consuming, consumption of fuel in the electric utility sector is replaced by residential or commercial fuel consumption. The waste heat generated from thermal technologies can be used to offset the water heating and space heating energy uses, but there is no thermally activated cooling capability. This study consists of a review of model documentation and a paper by EIA staff, a series of sensitivity runs performed by Berkeley Lab that exercise selected DG parameters in the AEO2002 version of NEMS, and a scoping effort of possible enhancements and alternatives to NEMS current DG capabilities. In general, the treatment of DG in NEMS is rudimentary. The penetration of DG is determined by an economic cash-flow analysis that determines adoption based on the n umber of years to a positive cash flow. Some important technologies, e.g. thermally activated cooling, are absent, and ceilings on DG adoption are determined by some what arbitrary caps on the number of buildings that can adopt DG. These caps are particularly severe for existing buildings, where the maximum penetration for any one technology is 0.25 percent. On the other hand, competition among technologies is not fully considered, and this may result in double-counting for certain applications. A series of sensitivity runs show greater penetration with net metering enhancements and aggressive tax credits and a more limited response to lowered DG technology costs. Discussion of alternatives to the current code is presented in Section 4. Alternatives or improvements to how DG is modeled in NEMS cover three basic areas: expanding on the existing total market for DG both by changing existing parameters in NEMS and by adding new capabilities, such as for missing technologies; enhancing the cash flow analysis but incorporating aspects of DG economics that are not currently represented, e.g. complex tariffs; and using an external geographic information system (GIS) driven analysis that can better and more intuitively identify niche markets.

LaCommare, Kristina Hamachi; Edwards, Jennifer L.; Marnay, Chris

2003-01-01T23:59:59.000Z

43

Demand Response and Variable Generation Integration Scoping Study  

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

Utility Studies Utility Studies LBNL-6248E Peter Cappers, Annika Todd, Charles Goldman June 2013 1 Presentation Overview * Objectives and Approach * Details of CBS Projects * Summary and Conclusions 2 LBNL - Smart Grid Investment Grant Consumer Behavior Study Analysis Background on Smart Grid Investment Grant's Consumer Behavior Studies * The U.S. DOE's Smart Grid Investment Grant (SGIG) program includes projects studying the response of mass market consumers (i.e., residential and small commercial customers) to time-based rate programs * DOE is seeking to apply a consistent study design and analysis framework for these Consumer Behavior Studies (CBS) * The goal is to conduct comparative analysis of the impacts of AMI, time-based rate programs and enabling technologies that

44

TVA generating unit modeling using MATLAB  

Science Journals Connector (OSTI)

Abstract In the present paper, the numerical evaluation of Markov model transient behavior is considered. It is focused on finding the transient-state probabilities of well-known four Tennessee Valley Authority (TVA) models. Three computational approaches are examined to find the three transient probabilities after modeling. These approaches are the Laplace Transforms, curve fitting and Neuro-Fuzzy. The MATLAB Simulink 7.10 package is used to obtain the transient state-probabilities for the four TVA models and at the same interval of time these solutions are reproduced by Laplace Transforms. For each model the three-state probabilities of the TVA models are derived. Each model is considered as a 3-state model, where its equations are obtained using the curve fitting and Neuro-Fuzzy techniques. All techniques used and applied in the present study are used to formulate and obtain the TVA models, where the Laplace Transforms is re-derived and re-used for a double check to model and obtain the results.

Mohamed Y. Al-Hamad; Isa S. Qamber

2014-01-01T23:59:59.000Z

45

Nuclear response beyond the Fermi gas model  

E-Print Network [OSTI]

The Fermi gas model, while providing a reasonable qualitative description of the continuum nuclear response, does not include the effects of dynamical nucleon-nucleon correlations in the initial and final states, that have long been recognized to play a critical role in specific kinematical regions. We review a many-body approach in which these effects are consistently taken into account and discuss the results of a calculation of the quasielastic neutrino-oxygen cross section as an illustrative example.

Omar Benhar

2003-07-14T23:59:59.000Z

46

Model Recovery Procedure for Response to a Radiological Transportation...  

Office of Environmental Management (EM)

Recovery Procedure for Response to a Radiological Transportation Incident Model Recovery Procedure for Response to a Radiological Transportation Incident This Transportation...

47

Model Annex for Preparedness and Response to Radiological Transportati...  

Office of Environmental Management (EM)

Annex for Preparedness and Response to Radiological Transportation Incidents Model Annex for Preparedness and Response to Radiological Transportation Incidents This part should...

48

Statistical Models for Next Generation Sequencing Data  

E-Print Network [OSTI]

prior indexed by distances from Gene Ontology (GO). The use of the external biological information yields improvements in statistical power over the original Bayesian discovery procedure. The third model addresses the problem of identifying protein...

Wang, Yiyi

2013-04-01T23:59:59.000Z

49

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

50

Thermal building simulation and computer generation of nodal models  

E-Print Network [OSTI]

Thermal building simulation and computer generation of nodal models H. BOYER, J.P. CHABRIAT, B exchanges and finally in the constitution of thermal state models of the building. Big variations existing from one building to another, it's necessary to build the thermal model from the building description

Paris-Sud XI, Université de

51

Toward optimized code generation through model-based optimization  

E-Print Network [OSTI]

Toward optimized code generation through model- based optimization Asma Charfi, Chokri Mraidha with in RTES development is linked to the optimization of their software part. Although automatic code generation and the use of optimizing compilers bring some answers to application optimization issue, we

Paris-Sud XI, Université de

52

A generative model for activations in functional MRI  

E-Print Network [OSTI]

Detection of brain activity and selectivity using functional magnetic resonance imaging (fMRI) provides unique insight into the underlying functional properties of the brain. We propose a generative model that jointly ...

Sridharan, Ramesh

2011-01-01T23:59:59.000Z

53

SECOND GENERATION REFORMS IN CHILE, POWER EXCHANGE MODEL. THE SOLUTION?  

E-Print Network [OSTI]

SECOND GENERATION REFORMS IN CHILE, POWER EXCHANGE MODEL. THE SOLUTION? David Watts Paulo Atienza to participate. Chile was the pioneer introducing this kind of reforms, through the application of a centralized

Catholic University of Chile (Universidad CatĂłlica de Chile)

54

Modeling of leachate generation in municipal solid waste landfills  

E-Print Network [OSTI]

parameters specified by the user. Ultimately, this model will strive to replace the time the user requires to generate and fill a given landfill geometry with time spent running and evaluating trials to yield the best design....

Beck, James Bryan

2012-06-07T23:59:59.000Z

55

Multi-objective dynamic economic emission dispatch of electric power generation integrated with game theory based demand response programs  

Science Journals Connector (OSTI)

Abstract The dynamic economic emission dispatch (DEED) of electric power generation is a multi-objective mathematical optimization problem with two objective functions. The first objective is to minimize all the fuel costs of the generators in the power system, whilst the second objective seeks to minimize the emissions cost. Both objective functions are subject to constraints such as load demand constraint, ramp rate constraint, amongst other constraints. In this work, we integrate a game theory based demand response program into the DEED problem. The game theory based demand response program determines the optimal hourly incentive to be offered to customers who sign up for load curtailment. The game theory model has in built mechanisms to ensure that the incentive offered the customers is greater than the cost of interruption while simultaneously being beneficial to the utility. The combined DEED and game theoretic demand response model presented in this work, minimizes fuel and emissions costs and simultaneously determines the optimal incentive and load curtailment customers have to perform for maximal power system relief. The developed model is tested on two test systems with industrial customers and obtained results indicate the practical benefits of the proposed model.

Nnamdi I. Nwulu; Xiaohua Xia

2015-01-01T23:59:59.000Z

56

Study on Revolving Reserve Optimization Model Considering Demand Response  

Science Journals Connector (OSTI)

Traditional dispatching model could not suit the requirement in power market, optimal dispatching model considering demand response has been established by using optimal theories...

Na Yu; Guoqing Li

2013-01-01T23:59:59.000Z

57

Examining Uncertainty in Demand Response Baseline Models and  

E-Print Network [OSTI]

LBNL-5096E Examining Uncertainty in Demand Response Baseline Models and Variability in Automated of California. #12;Examining Uncertainty in Demand Response Baseline Models and Variability in Automated.e. dynamic prices). Using a regression-based baseline model, we define several Demand Response (DR

58

Two Market Models for Demand Response in Power Networks  

E-Print Network [OSTI]

Two Market Models for Demand Response in Power Networks Lijun Chen, Na Li, Steven H. Low and John C-- In this paper, we consider two abstract market models for designing demand response to match power supply as oligopolistic markets, and propose distributed demand response algorithms to achieve the equilibria. The models

Low, Steven H.

59

Simple model for decay of laser generated shock waves  

SciTech Connect (OSTI)

A simple model is derived to calculate the hydrodynamic decay of laser-generated shock waves. Comparison with detailed hydrocode simulations shows good agreement between calculated time evolution of shock pressure, position, and instantaneous pressure profile. Reliability of the model decreases in regions of the target where superthermal-electron preheat effects become comparable to shock effects.

Trainor, R.J.

1980-10-24T23:59:59.000Z

60

DOE Hydrogen Analysis Repository: Second Generation Model (SGM)  

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

Second Generation Model (SGM) Second Generation Model (SGM) Project Summary Full Title: Second Generation Model (SGM) Project ID: 166 Principal Investigator: Roland Sands Brief Description: The SGM projects economic activity, energy consumption and greenhouse gas emissions for each region in five-year time steps from 1990 through 2050. Purpose Project economic activity, energy consumption and greenhouse gas emissions for various regions. Performer Principal Investigator: Roland Sands Organization: Pacific Northwest National Laboratory (PNNL) Address: 8400 Baltimore Avenue, JGCRI College Park, MD 20740 Telephone: 301-314-6765 Email: roland.sands@pnl.gov Project Description Type of Project: Model Category: Energy Infrastructure, Environmental, Macro-Economic User Inputs: Factor productivity growth rates by sector (9 in SGM 98) and region; capital stocks by vintage, demographic determinants (endogenous demographics), fossil and non-fossil fuel resources

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


61

New model for ultracompact coaxial Marx pulse generator simulations  

Science Journals Connector (OSTI)

This article describes a new simulation model developed with PSPICE in order to improve the ultra compact Marx generators designed at the French-German Research Institute of Saint-Louis (ISL). The proposed model is based on a Marx elementary unit and is an equivalent electric circuit that matches the actual configuration of the generator. It consists of a structural description of the elementary stage of a Marx generator including stray components. It also includes a behavioral model of the spark gap switches based on the Vlastos formula determining the arc resistance value. The prebreakdown delay is also taken into account. Experimental data have been used to validate the results of the simulations. An original indirect measurement allowing the estimation of the spark gap resistance is also proposed.

Benoît Martin; Pierre Raymond; Joseph Wey

2006-01-01T23:59:59.000Z

62

Modeling, control and electromagnetic transient simulation of the doubly fed induction generator-based wind energy generation system  

Science Journals Connector (OSTI)

This paper presents the dynamic modeling and the stator-voltage-aligned control (SVAC) strategies of the doubly fed induction generator (DFIG)-based wind energy generation system (WEGS). The state-space dynamic model of the DFIG is derived in the synchronous ... Keywords: EMTP-ATP, double-fed induction generators, engineering education, internal model control, maximum power-point tracking algorithm, stator-voltage-aligned control, wind power generation

Yang Han, Pan Shen

2014-03-01T23:59:59.000Z

63

The generation of shared cryptographic keys through channel impulse response estimation at 60 GHz.  

SciTech Connect (OSTI)

Methods to generate private keys based on wireless channel characteristics have been proposed as an alternative to standard key-management schemes. In this work, we discuss past work in the field and offer a generalized scheme for the generation of private keys using uncorrelated channels in multiple domains. Proposed cognitive enhancements measure channel characteristics, to dynamically change transmission and reception parameters as well as estimate private key randomness and expiration times. Finally, results are presented on the implementation of a system for the generation of private keys for cryptographic communications using channel impulse-response estimation at 60 GHz. The testbed is composed of commercial millimeter-wave VubIQ transceivers, laboratory equipment, and software implemented in MATLAB. Novel cognitive enhancements are demonstrated, using channel estimation to dynamically change system parameters and estimate cryptographic key strength. We show for a complex channel that secret key generation can be accomplished on the order of 100 kb/s.

Young, Derek P.; Forman, Michael A.; Dowdle, Donald Ryan

2010-09-01T23:59:59.000Z

64

Scaled modeling and simulation of ocean wave linear generator buoy systems.  

E-Print Network [OSTI]

??Accurate scaled modeling and simulation are critical to advancing ocean wave linear generator buoys. A 100th scaled model of ocean wave generator buoy systems is… (more)

Gore, Ganesh P.

2006-01-01T23:59:59.000Z

65

ERCOT's Dynamic Model of Wind Turbine Generators: Preprint  

SciTech Connect (OSTI)

By the end of 2003, the total installed wind farm capacity in the Electric Reliability Council of Texas (ERCOT) system was approximately 1 gigawatt (GW) and the total in the United States was about 5 GW. As the number of wind turbines installed throughout the United States increases, there is a greater need for dynamic wind turbine generator models that can properly model entire power systems for different types of analysis. This paper describes the ERCOT dynamic models and simulations of a simple network with different types of wind turbine models currently available.

Muljadi, E.; Butterfield, C. P.; Conto, J.; Donoho, K.

2005-08-01T23:59:59.000Z

66

Modeling of a detonation driven, linear electric generator facility  

E-Print Network [OSTI]

Modeling of a detonation driven, linear electric generator facility E.M. Braun, E. Baydar, and F.K. Lu 1 Introduction The pulsed detonation engine (PDE) has been developed over several decades due must consider if the unique properties of the detonation wave can be utilized to in- crease efficiency

Texas at Arlington, University of

67

System level modeling of thermoelectric generators for automotive applications  

Broader source: Energy.gov [DOE]

Uses a model to predict and analyze the system-level performance of a thermoelectric generator in terms of the power output and the power density ? at the element, module and system-level and for a wide range of operating conditions.

68

Full expandable model of parallel self-excited induction generators  

E-Print Network [OSTI]

for wind and small hydro power plants [1, 2]. They have advantages over conventional synchronous generators of wind power into power networks, an accurate dynamic model of the overall wind farm system is required to analyse the interaction between the wind farm and the power system. A system of parallel-operated SEIGs

Simões, Marcelo Godoy

69

Modeling Generator Power Plant Portfolios and Pollution Taxes in  

E-Print Network [OSTI]

Modeling Generator Power Plant Portfolios and Pollution Taxes in Electric Power Supply Chain-term solution (e.g.,are long-term solution (e.g., solar power and wind power (solar power and wind power Heavy user of fossil fuels:Heavy user of fossil fuels: Electric power industryElectric power industry

Nagurney, Anna

70

Mass Market Demand Response and Variable Generation Integration Issues: A Scoping Study  

SciTech Connect (OSTI)

This scoping study focuses on the policy issues inherent in the claims made by some Smart Grid proponents that the demand response potential of mass market customers which is enabled by widespread implementation of Advanced Metering Infrastructure (AMI) through the Smart Grid could be the “silver bullet” for mitigating variable generation integration issues. In terms of approach, we will: identify key issues associated with integrating large amounts of variable generation into the bulk power system; identify demand response opportunities made more readily available to mass market customers through widespread deployment of AMI systems and how they can affect the bulk power system; assess the extent to which these mass market Demand Response (DR) opportunities can mitigate Variable Generation (VG) integration issues in the near-term and what electricity market structures and regulatory practices could be changed to further expand the ability for DR to mitigate VG integration issues over the long term; and provide a qualitative comparison of DR and other approaches to mitigate VG integration issues.

Cappers, Peter; Mills, Andrew; Goldman, Charles; Wiser, Ryan; Eto, Joseph H.

2011-09-10T23:59:59.000Z

71

New Zealand Interactive Electricity Generation Cost Model 2010 | Open  

Open Energy Info (EERE)

form form View source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit with form History Facebook icon Twitter icon » New Zealand Interactive Electricity Generation Cost Model 2010 Jump to: navigation, search Tool Summary LAUNCH TOOL Name: New Zealand Interactive Electricity Generation Cost Model 2010 Agency/Company /Organization: New Zealand Energy Authority Sector: Energy Topics: Finance, Implementation, Co-benefits assessment Resource Type: Software/modeling tools User Interface: Spreadsheet Website: www.med.govt.nz/templates/MultipageDocumentTOC____45553.aspx Country: New Zealand Cost: Free Australia and New Zealand Coordinates: -40.900557°, 174.885971°

72

An Operational Model for Optimal NonDispatchable Demand Response  

E-Print Network [OSTI]

An Operational Model for Optimal NonDispatchable Demand Response for Continuous PowerintensiveFACTS, $ Demand Response Energy Storage HVDC Industrial Customer PEV Renewable Energy Source: U.S.-Canada Power: To balance supply and demand of a power system, one can manipulate both: supply and demand demand response

Grossmann, Ignacio E.

73

Modeling Framework and Validation of a Smart Grid and Demand Response System for Wind Power Integration  

SciTech Connect (OSTI)

Electricity generation from wind power and other renewable energy sources is increasing, and their variability introduces new challenges to the power system. The emergence of smart grid technologies in recent years has seen a paradigm shift in redefining the electrical system of the future, in which controlled response of the demand side is used to balance fluctuations and intermittencies from the generation side. This paper presents a modeling framework for an integrated electricity system where loads become an additional resource. The agent-based model represents a smart grid power system integrating generators, transmission, distribution, loads and market. The model incorporates generator and load controllers, allowing suppliers and demanders to bid into a Real-Time Pricing (RTP) electricity market. The modeling framework is applied to represent a physical demonstration project conducted on the Olympic Peninsula, Washington, USA, and validation simulations are performed using actual dynamic data. Wind power is then introduced into the power generation mix illustrating the potential of demand response to mitigate the impact of wind power variability, primarily through thermostatically controlled loads. The results also indicate that effective implementation of Demand Response (DR) to assist integration of variable renewable energy resources requires a diversity of loads to ensure functionality of the overall system.

Broeer, Torsten; Fuller, Jason C.; Tuffner, Francis K.; Chassin, David P.; Djilali, Ned

2014-01-31T23:59:59.000Z

74

Generative Models for Super-Resolution Single Molecule Microscopy Images of Biological Structures  

E-Print Network [OSTI]

an information bridge between super-resolution microscopy and structural biology by using generative models

Matsuda, Noboru

75

Power System Modeling of 20percent Wind-Generated Electricity by 2030  

E-Print Network [OSTI]

power system modeling, wind energy I. I NTRODUCTION Generating electricity from wind technology has several advantages

Hand, Maureen

2008-01-01T23:59:59.000Z

76

Multi-physics modeling of thermoelectric generators for waste heat recovery applications  

Broader source: Energy.gov [DOE]

Model developed provides effective guidelines to designing thermoelectric generation systems for automotive waste heat recovery applications

77

Cost and Performance Assumptions for Modeling Electricity Generation Technologies  

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

Cost and Performance Cost and Performance Assumptions for Modeling Electricity Generation Technologies Rick Tidball, Joel Bluestein, Nick Rodriguez, and Stu Knoke ICF International Fairfax, Virginia Subcontract Report NREL/SR-6A20-48595 November 2010 NREL is a national laboratory of the U.S. Department of Energy, Office of Energy Efficiency & Renewable Energy, operated by the Alliance for Sustainable Energy, LLC. National Renewable Energy Laboratory 1617 Cole Boulevard Golden, Colorado 80401 303-275-3000 * www.nrel.gov Contract No. DE-AC36-08GO28308 Cost and Performance Assumptions for Modeling Electricity Generation Technologies Rick Tidball, Joel Bluestein, Nick Rodriguez, and Stu Knoke ICF International Fairfax, Virginia NREL Technical Monitor: Jordan Macknick

78

Modeling acid-gas generation from boiling chloride brines  

SciTech Connect (OSTI)

This study investigates the generation of HCl and other acid gases from boiling calcium chloride dominated waters at atmospheric pressure, primarily using numerical modeling. The main focus of this investigation relates to the long-term geologic disposal of nuclear waste at Yucca Mountain, Nevada, where pore waters around waste-emplacement tunnels are expected to undergo boiling and evaporative concentration as a result of the heat released by spent nuclear fuel. Processes that are modeled include boiling of highly concentrated solutions, gas transport, and gas condensation accompanied by the dissociation of acid gases, causing low-pH condensate. Simple calculations are first carried out to evaluate condensate pH as a function of HCl gas fugacity and condensed water fraction for a vapor equilibrated with saturated calcium chloride brine at 50-150 C and 1 bar. The distillation of a calcium-chloride-dominated brine is then simulated with a reactive transport model using a brine composition representative of partially evaporated calcium-rich pore waters at Yucca Mountain. Results show a significant increase in boiling temperature from evaporative concentration, as well as low pH in condensates, particularly for dynamic systems where partial condensation takes place, which result in enrichment of HCl in condensates. These results are in qualitative agreement with experimental data from other studies. The combination of reactive transport with multicomponent brine chemistry to study evaporation, boiling, and the potential for acid gas generation at the proposed Yucca Mountain repository is seen as an improvement relative to previously applied simpler batch evaporation models. This approach allows the evaluation of thermal, hydrological, and chemical (THC) processes in a coupled manner, and modeling of settings much more relevant to actual field conditions than the distillation experiment considered. The actual and modeled distillation experiments do not represent expected conditions in an emplacement drift, but nevertheless illustrate the potential for acid-gas generation at moderate temperatures (<150 C).

Zhang, Guoxiang; Spycher, Nicolas; Sonnenthal, Eric; Steefel, Carl

2009-11-16T23:59:59.000Z

79

Modelling the climate response to orbital forcing  

Science Journals Connector (OSTI)

...next few years there will be a tremendous expansion in models that include several additional components. Such Earth system models will at last allow us to fully tackle the link between orbital forcing, climate variability, and the sediment...

1999-01-01T23:59:59.000Z

80

A Simple Generative Model of Collective Online Behaviour  

E-Print Network [OSTI]

Human activities---from voter mobilization to political protests---increasingly take place in online environments, providing novel opportunities for relating individual behaviours to population-level outcomes. The recent availability of data sets that capture the behaviour of individuals participating in online social systems has driven the emerging field of computational social science, as large-scale empirical data sets enable the development of detailed computational models of individual and collective behaviour. Given the inherent limitations of observational data, it is crucial to investigate the extent to which models of collective dynamics can distinguish between different individual-level mechanisms. Here we introduce a simple generative model for the collective behaviour of millions of social networking site users who are deciding between different software applications. Our model incorporates two distinct components: one is associated with recent decisions of users, and the other reflects the cumula...

Gleeson, James P; Onnela, Jukka-Pekka; Porter, Mason A; Reed-Tsochas, Felix

2013-01-01T23:59:59.000Z

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


81

A distributed model for capacitance requirements for self-excited induction generators  

Science Journals Connector (OSTI)

The main objective of this paper is to construct a distributed environment through which the capacitance requirements of self-excited induction generators can be monitored and controlled. A single-server/multiclient architecture has been proposed which enables that the self-excited induction generators can access the remote server at any time, with their respective data and can able to get the minimum capacitance requirements. An Remote Method Invocation (RMI)-based distributed model has been developed in such a way that for every specific period of time, the remote server obtains the system data simultaneously from the neighbouring self-excited induction generators which are the clients registered with it and the server send back the capacitance requirements as response to the respective clients. The server creates a new thread of control for every client request and hence complete distributed environment has been exploited.

K. Nithiyananthan; V. Ramachandran

2008-01-01T23:59:59.000Z

82

Diagnostic and Prognostic Models for Generator Step-Up Transformers  

SciTech Connect (OSTI)

In 2014, the online monitoring (OLM) of active components project under the Light Water Reactor Sustainability program at Idaho National Laboratory (INL) focused on diagnostic and prognostic capabilities for generator step-up transformers. INL worked with subject matter experts from the Electric Power Research Institute (EPRI) to augment and revise the GSU fault signatures previously implemented in the Electric Power Research Institute’s (EPRI’s) Fleet-Wide Prognostic and Health Management (FW-PHM) Suite software. Two prognostic models were identified and implemented for GSUs in the FW-PHM Suite software. INL and EPRI demonstrated the use of prognostic capabilities for GSUs. The complete set of fault signatures developed for GSUs in the Asset Fault Signature Database of the FW-PHM Suite for GSUs is presented in this report. Two prognostic models are described for paper insulation: the Chendong model for degree of polymerization, and an IEEE model that uses a loading profile to calculates life consumption based on hot spot winding temperatures. Both models are life consumption models, which are examples of type II prognostic models. Use of the models in the FW-PHM Suite was successfully demonstrated at the 2014 August Utility Working Group Meeting, Idaho Falls, Idaho, to representatives from different utilities, EPRI, and the Halden Research Project.

Vivek Agarwal; Nancy J. Lybeck; Binh T. Pham

2014-09-01T23:59:59.000Z

83

Modeling of Electric Water Heaters for Demand Response: A Baseline PDE Model  

SciTech Connect (OSTI)

Demand response (DR)control can effectively relieve balancing and frequency regulation burdens on conventional generators, facilitate integrating more renewable energy, and reduce generation and transmission investments needed to meet peak demands. Electric water heaters (EWHs) have a great potential in implementing DR control strategies because: (a) the EWH power consumption has a high correlation with daily load patterns; (b) they constitute a significant percentage of domestic electrical load; (c) the heating element is a resistor, without reactive power consumption; and (d) they can be used as energy storage devices when needed. Accurately modeling the dynamic behavior of EWHs is essential for designing DR controls. Various water heater models, simplified to different extents, were published in the literature; however, few of them were validated against field measurements, which may result in inaccuracy when implementing DR controls. In this paper, a partial differential equation physics-based model, developed to capture detailed temperature profiles at different tank locations, is validated against field test data for more than 10 days. The developed model shows very good performance in capturing water thermal dynamics for benchmark testing purposes

Xu, Zhijie; Diao, Ruisheng; Lu, Shuai; Lian, Jianming; Zhang, Yu

2014-09-05T23:59:59.000Z

84

Gravitational wave generation in power-law inflationary models  

E-Print Network [OSTI]

We investigate the generation of gravitational waves in power-law inflationary models. The energy spectrum of the gravitational waves is calculated using the method of continuous Bogoliubov coefficients. We show that, by looking at the interval of frequencies between 10^(-5) and 10^5 Hz and also at the GHz range, important information can be obtained, both about the inflationary period itself and about the thermalization regime between the end of inflation and the beginning of the radiation-dominated era. We thus deem the development of gravitational wave detectors, covering the MHz/GHz range of frequencies, to be an important task for the future.

Paulo M. Sá; Alfredo B. Henriques

2008-06-06T23:59:59.000Z

85

A BFS-DEVS Approach for Induction Generator Non Traditional Modelling L. Capocchi  

E-Print Network [OSTI]

A BFS-DEVS Approach for Induction Generator Non Traditional Modelling L. Capocchi University particularly of an induction generator machine. Our approach is based on VHDL-AMS (Very high speed integrated-oriented model, a simplified and realistic model of an induc- tion generator machine can be defined. That model

Paris-Sud XI, Université de

86

A Brief History of Generative Models for Power Law and Lognormal Distributions  

E-Print Network [OSTI]

A Brief History of Generative Models for Power Law and Lognormal Distributions Michael Mitzenmacher generative models that lead to these distributions. One #12;nding is that lognormal and power law of an underlying generative model which suggested that #12;le sizes were better modeled by a lognormal distribution

Mitzenmacher, Michael

87

Fault response of inverter interfaced distributed generators in grid-connected applications  

Science Journals Connector (OSTI)

Abstract Inverter-interfaced distributed generation is prominent in some distribution networks because of the growth of PV and other new sources. In order to ensure that protection system design remains effective in this environment, it is essential to be able to accurately represent inverters in fault current calculations. Calculating the fault current contribution is complicated because of the nature of the transition into current limiting mode and because the current produced is a function of control choices as well as physical components. The desire is for a simple source plus impedance model for incorporation into network studies. Based on knowledge of the control strategy and the details of the method of current limiting, linear analytical equivalent models are proposed whose source and impedance values (at fundamental frequency) can be expressed as a function of the inverter's hardware parameters and controller gains. The dependence of the entry into current limit on the nature and location of other generators in the network leads to a proposal for a load flow based fault analysis incorporating the new models. This iteratively determines which inverter experiences current limiting. The proposed inverter fault models and their use in a network fault analysis have been verified against experimental results in a 3-inverter network.

Cornelis A. Plet; Timothy C. Green

2014-01-01T23:59:59.000Z

88

A Model of U.S. Commercial Distributed Generation Adoption  

SciTech Connect (OSTI)

Small-scale (100 kW-5 MW) on-site distributed generation (DG) economically driven by combined heat and power (CHP) applications and, in some cases, reliability concerns will likely emerge as a common feature of commercial building energy systems over the next two decades. Forecasts of DG adoption published by the Energy Information Administration (EIA) in the Annual Energy Outlook (AEO) are made using the National Energy Modeling System (NEMS), which has a forecasting module that predicts the penetration of several possible commercial building DG technologies over the period 2005-2025. NEMS is also used for estimating the future benefits of Department of Energy research and development used in support of budget requests and management decisionmaking. The NEMS approach to modeling DG has some limitations, including constraints on the amount of DG allowed for retrofits to existing buildings and a small number of possible sizes for each DG technology. An alternative approach called Commercial Sector Model (ComSeM) is developed to improve the way in which DG adoption is modeled. The approach incorporates load shapes for specific end uses in specific building types in specific regions, e.g., cooling in hospitals in Atlanta or space heating in Chicago offices. The Distributed Energy Resources Customer Adoption Model (DER-CAM) uses these load profiles together with input cost and performance DG technology assumptions to model the potential DG adoption for four selected cities and two sizes of five building types in selected forecast years to 2022. The Distributed Energy Resources Market Diffusion Model (DER-MaDiM) is then used to then tailor the DER-CAM results to adoption projections for the entire U.S. commercial sector for all forecast years from 2007-2025. This process is conducted such that the structure of results are consistent with the structure of NEMS, and can be re-injected into NEMS that can then be used to integrate adoption results into a full forecast.

LaCommare, Kristina Hamachi; Ryan Firestone; Zhou, Nan; Maribu,Karl; Marnay, Chris

2006-01-10T23:59:59.000Z

89

Generated using version 3.1.1 of the official AMS LATEX template Atmospheric Circulation Response to An1  

E-Print Network [OSTI]

Generated using version 3.1.1 of the official AMS LATEX template Atmospheric Circulation Response transient step-by-step adjustment of the circulation. The transient atmospheric adjustment9 is examined in setting up the extratropical tropospheric response to global21 warming.22 1 #12;1. Introduction23

Khatiwala, Samar

90

Production and maintenance planning for electricity generators: modeling and application to Indian power systems  

E-Print Network [OSTI]

Production and maintenance planning for electricity generators: modeling and application to Indian power systems Debabrata Chattopadhyay Department of Management, University of Canterbury, Private Bag describes the development of an optimization model to perform the fuel supply, electricity generation

Dragoti-Ă?ela, Eranda

91

Reactive Transport Modeling of Acid Gas Generation and Condensation  

SciTech Connect (OSTI)

Pulvirenti et al. (2004) recently conducted a laboratory evaporation/condensation experiment on a synthetic solution of primarily calcium chloride. This solution represents one potential type of evaporated pore water at Yucca Mountain, Nevada, a site proposed for geologic storage of high-level nuclear waste. These authors reported that boiling this solution to near dryness (a concentration factor >75,000 relative to actual pore waters) leads to the generation of acid condensate (pH 4.5) presumably due to volatilization of HCl (and minor HF and/or HNO{sub 3}). To investigate the various processes taking place, including boiling, gas transport, and condensation, their experiment was simulated by modifying an existing multicomponent and multiphase reactive transport code (TOUGHREACT). This code was extended with a Pitzer ion-interaction model to deal with high ionic strength. The model of the experiment was set-up to capture the observed increase in boiling temperature (143 C at {approx}1 bar) resulting from high concentrations of dissolved salts (up to 8 m CaCl{sub 2}). The computed HCI fugacity ({approx} 10{sup -4} bars) generated by boiling under these conditions is not sufficient to lower the pH of the condensate (cooled to 80 and 25 C) down to observed values unless the H{sub 2}O mass fraction in gas is reduced below {approx}10%. This is because the condensate becomes progressively diluted by H{sub 2}O gas condensation. However, when the system is modeled to remove water vapor, the computed pH of instantaneous condensates decreases to {approx}1.7, consistent with the experiment (Figure 1). The results also show that the HCl fugacity increases, and calcite, gypsum, sylvite, halite, MgCl{sub 2}4H{sub 2}O and CaCl{sub 2} precipitate sequentially with increasing concentration factors.

G. Zhahg; N. Spycher; E. Sonnenthal; C. Steefel

2005-01-25T23:59:59.000Z

92

Mass Market Demand Response and Variable Generation Integration Issues: A Scoping Study  

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

63E 63E Mass Market Demand Response and Variable Generation Integration Issues: A Scoping Study Peter Cappers, Andrew Mills, Charles Goldman, Ryan Wiser, Joseph H. Eto Environmental Energy Technologies Division October 2011 The work described in this report was funded by the Permitting, Siting and Analysis Division of the U.S. Department of Energy's Office of Electricity Delivery and Energy Reliability under Lawrence Berkeley National Laboratory Contract No. DE-AC02- 05CH11231. ERNEST ORLANDO LAWRENCE BERKELEY NATIONAL LABORATORY Disclaimer This document was prepared as an account of work sponsored by the United States Government. While this document is believed to contain correct information, neither the United States Government nor any agency thereof, nor The Regents of the

93

Report of tritide study at the Responsive Neutron Generator Product Deployment Center.  

SciTech Connect (OSTI)

This report documents a study of sample counting results for wipes from routine surface area monitoring conducted at the Responsive Neutron Generator Product Deployment Center (RNGPDC) at Sandia National Laboratories (SNL). The study was initiated in November 2006, with two samples suspected of containing erbium tritide, after some samples were found to exhibit higher tritium counting rates upon recount at a later time. The main goal of the study was to determine whether the current practice of analyzing tritium wipe samples once, within a few days of sample collection, is adequate to accurately quantify the amount of tritium on the sample when tritides may be present. Recommendations are made toward routine recounting of vials suspected of containing particulate forms of tritium.

Burkhart, Robert; Coffey, Jaime

2008-11-01T23:59:59.000Z

94

Modeling of a rotor speed transient response with radial rubbing  

E-Print Network [OSTI]

by an accidental blade­off imbalance. In order to assess the angular deceleration of the rotor due to rubbingModeling of a rotor speed transient response with radial rubbing Sébastien Roques1 Institut deGill Univer- sity, 817 Sherbrooke St West, Montreal, Quebec H3A 2K6, Canada Abstract A rotor­stator model

Boyer, Edmond

95

Musculoskeletal simulation model generation from MRI datasets and motion capture data  

E-Print Network [OSTI]

Musculoskeletal simulation model generation from MRI datasets and motion capture data JĂ©rĂ´me Schmid

Paris-Sud XI, Université de

96

Modeling, Analysis, and Control of Demand Response Resources  

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

Modeling, Analysis, and Control of Demand Response Resources Modeling, Analysis, and Control of Demand Response Resources Speaker(s): Johanna Mathieu Date: April 27, 2012 - 12:00pm Location: 90-3122 Seminar Host/Point of Contact: Sila Kiliccote While the traditional goal of an electric power system has been to control supply to fulfill demand, the demand-side can play an active role in power systems via Demand Response (DR). Recent DR programs have focused on peak load reduction in commercial buildings and industrial facilities (C&I facilities). We present a regression-based baseline model, which allows us to quantify DR performance. We use this baseline model to understand the performance of C&I facilities participating in an automated dynamic pricing DR program in California. In this program, facilities are

97

A source function method for generation of waves on currents in Boussinesq models  

E-Print Network [OSTI]

A source function method for generation of waves on currents in Boussinesq models A. Chawlaa,*, J for the generation of waves internal to Boussinesq model grid boundaries (Wei G, Kirby JT, Sinha A. Generation of waves in Boussinesq models using a source function method. Coastal Engng 1999;36:271­299) is generalized

Kirby, James T.

98

Aspect-oriented model-driven code generation: A systematic mapping study  

Science Journals Connector (OSTI)

Context: Model-driven code generation is being increasingly applied to enhance software development from perspectives of maintainability, extensibility and reusability. However, aspect-oriented code generation from models is an area that is currently ... Keywords: Aspect-oriented software development, Code generation, Model-driven engineering, Systematic map

Abid Mehmood; Dayang N. A. Jawawi

2013-02-01T23:59:59.000Z

99

The Plausibility of Semantic Properties Generated by a Distributional Model: Evidence from a Visual World Experiment  

E-Print Network [OSTI]

The Plausibility of Semantic Properties Generated by a Distributional Model: Evidence from a Visual the plausibility of the properties generated by a distributional model using data from a visual world experiment, recently, a distributional model has been proposed that is able to generate properties associated

Koehn, Philipp

100

Analytical thermal model validation for Cassini radioisotope thermoelectric generator  

SciTech Connect (OSTI)

The Saturn-bound Cassini spacecraft is designed to rely, without precedent, on the waste heat from its three radioisotope thermoelectric generators (RTGs) to warm the propulsion module subsystem, and the RTG end dome temperature is a key determining factor of the amount of waste heat delivered. A previously validated SINDA thermal model of the RTG was the sole guide to understanding its complex thermal behavior, but displayed large discrepancies against some initial thermal development test data. A careful revalidation effort led to significant modifications and adjustments of the model, which result in a doubling of the radiative heat transfer from the heat source support assemblies to the end domes and bring up the end dome and flange temperature predictions to within 2 C of the pertinent test data. The increased inboard end dome temperature has a considerable impact on thermal control of the spacecraft central body. The validation process offers an example of physically-driven analytical model calibration with test data from not only an electrical simulator but also a nuclear-fueled flight unit, and has established the end dome temperatures of a flight RTG where no in-flight or ground-test data existed before.

Lin, E.I. [California Inst. of Tech., Pasadena, CA (United States). Jet Propulsion Lab.

1997-12-31T23:59:59.000Z

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


101

Multiple models decentralized coordinated control of doubly fed induction generator  

Science Journals Connector (OSTI)

Abstract In this paper, a multiple model optimal tracking control (MOTC) design method for the double fed induction generator (DFIG) using correlative measured technique is proposed. The DFIG is represented by a third-order model, where electro-magnetic transients of stator are neglected. By using the correlative measured technique, the correlative measured matrix (CMM) of wind power system is obtained firstly. Then, a nonstandard state space equation of DFIG is obtained with the correlative measured vectors (CMVs), which reflect interactions between the \\{DFIGs\\} and grid. In order to cope with nonlinearities and continuous variation in the operating points, a multiple model design method is proposed in the discrete domain. The obtained control law, synthesized by using Bayesian probability, only depends on the local measured parameters. Hence, the MOTC can be regarded as a decentralized coordinated control, which can simplify the control structure and improve the transient stability of DFIG. To illustrate the effectiveness of the proposed MOTC strategy, simulations on a hybrid wind thermal power (HWTP) system are performed. The results show that the proposed MOTC strategy can provide acceptable performance throughout the whole operating region. Comparing to the conventional PID control, transient stability, damping, and fault ride-through capability of DFIG with the proposed MOTC design method have been improved effectively.

Yu-guang Niu; Xiao-ming Li; Zhong-wei Lin; Ming-yang Li

2015-01-01T23:59:59.000Z

102

NDA SYSTEM RESPONSE MODELING AND ITS APPLICATION  

SciTech Connect (OSTI)

The Portsmouth gaseous diffusion plant (PORTS) is a uranium enrichment facility that was historically used to enrich uranium to levels that range from 2% to greater than 97%. The feed material for PORTS was obtained from the Paducah Gaseous Diffusion Plant (PGDP) that produced uranium in the form of UF6 that was enriched to about 1 to 2%. The enrichment process involves a multistage process by which gaseous UF{sub 6} passed through a diffusion barrier in each stage. The porous diffusion barrier in each stage retards the rate of the diffusion of the heavier {sup 238}U atoms relative to the diffusion of the lighter {sup 235}U atoms. By this process the product stream is slightly enriched by each stage of the process. Each stage consists of a compressor, converter and a motor. There are more than 4000 stages that are linked together with piping of various diameters to form the PORTS cascade. The cascade spans three interconnected buildings and comprises miles of piping, thousands of seals, converters, valves, motors, and compressors. During operation, PORTS process equipment contained UF{sub 6} gas with uranium enrichment that increased in the process stream from the first to the last stage in a known manner. Gaseous UF{sub 6} moving through the PORTS process equipment had potential to form deposits within the process equipment by several mechanisms, including solidification due to incorrect temperature and pressure conditions during the process, inleakage of atmospheric moisture that chemically reacts with UF{sub 6} to form hydrated uranyl fluoride solids, reduction reactions of UF{sub 6} with cascade metals, and UF{sub 6} condensation on the internal equipment surfaces. As a result, the process equipment of the PORTS contains a variable and unknown quantity of uranium with variable enrichment that has been deposited within the equipment during plant operations. The exact chemical form of this uranium is variable, although it is expected that the bulk of the material is of the form of uranyl fluoride that will become hydrated on exposure to moisture in air when the systems are no longer buffered. The deposit geometry and thickness is uncertain and variable. However, a reasonable assessment of the level of material holdup in this equipment is necessary to support decommissioning efforts. The assessment of nuclear material holdup in process equipment is a complex process that requires integration of process knowledge, nondestructive assay (NDA) measurements, and computer modeling to maximize capabilities and minimize uncertainty. The current report is focused on the use of computer modeling and simulation of NDA measurements.

Vinson, D.

2010-03-01T23:59:59.000Z

103

Multiphysics 3D Modelling of Ironless Permanent Magnet Generators  

Science Journals Connector (OSTI)

Abstract Analytical method is widely used for the preliminary design and optimization of electrical machines. It has short calculation time and low computational cost (cost of simulation codes and supporting hardware), but the calculate result is normally considered to be not as accurate as finite element method (FEM). On the other hand, it is time-consuming to optimize machines with FEM if the optimization is not parallelized. Parallelizing optimization requires many licenses when commercial FEM codes are used, which can be very expensive. Ironless permanent magnet generator has large diameter and small aspect ratio, therefore, multiphysics approach is expected to be used for investigating the magnetic and thermal field. To address the above challenges, this paper presents a multiphysics modelling strategy for the design and optimization of ironless permanent magnet generators. Open-source codes are used to reduce the computational cost. A design example is presented to demonstrate the detail of this design method. This approach is expected to be used in super computer in the future, so that the calculation time can be largely reduced.

Z. Zhang; S.M. Muyeen; A. Al-Durra; R. Nilssen; A. Nysveen

2014-01-01T23:59:59.000Z

104

Modeling of Syngas Reactions and Hydrogen Generation Over Sulfides  

SciTech Connect (OSTI)

The objective of the research is to analyze pathways of reactions of hydrogen with oxides of carbon over sulfides, and to predict which characteristics of the sulfide catalyst (nature of metal, defect structure) give rise to the lowest barriers toward oxygenated hydrocarbon product. Reversal of these pathways entails the generation of hydrogen, which is also proposed for study. In this first year of study, adsorption reactions of H atoms and H{sub 2} molecules with MoS{sub 2}, both in molecular and solid form, have been modeled using high-level density functional theory. The geometries and strengths of the adsorption sites are described and the methods used in the study are described. An exposed MO{sup IV} species modeled as a bent MoS{sub 2} molecule is capable of homopolar dissociative chemisorption of H{sub 2} into a dihydride S{sub 2}MoH{sub 2}. Among the periodic edge structures of hexagonal MoS{sub 2}, the (1{bar 2}11) edge is most stable but still capable of dissociating H{sub 2}, while the basal plane (0001) is not. A challenging task of theoretically accounting for weak bonding of MoS{sub 2} sheets across the Van der Waals gap has been addressed, resulting in a weak attraction of 0.028 eV/MoS{sub 2} unit, compared to the experimental value of 0.013 eV/MoS{sub 2} unit.

Kamil Klier; Jeffery A. Spirko; Michael L. Neiman

2002-09-17T23:59:59.000Z

105

The GGU-model and Generation of the Developmental Paradigms  

E-Print Network [OSTI]

In this brief note, certain illustrated methods for generating developmental paradigms (event sequences) are formalized and compared to previous methods.

Robert A. Herrmann

2014-02-17T23:59:59.000Z

106

Benchmarking nuclear models for Gamow-Teller response  

E-Print Network [OSTI]

A comparative study of the nuclear Gamow-Teller response (GTR) within conceptually different state-of-the-art approaches is presented. Three nuclear microscopic models are considered: (i) the recently developed charge-exchange relativistic time blocking approximation (RTBA) based on the covariant density functional theory, (ii) the shell model (SM) with an extended "jj77" model space and (iii) the non-relativistic quasiparticle random-phase approximation (QRPA) with a Brueckner G-matrix effective interaction. We study the physics cases where two or all three of these models can be applied. The Gamow-Teller response functions are calculated for 208-Pb, 132-Sn and 78-Ni within both RTBA and QRPA. The strengths obtained for 208-Pb are compared to data that enables a firm model benchmarking. For the nucleus 132-Sn, also SM calculations are performed within the model space truncated at the level of a particle-hole (ph) coupled to vibration configurations. This allows a consistent comparison to the RTBA where ph+phonon coupling is responsible for the spreading width and considerable quenching of the GTR. Differences between the models and perspectives of their future developments are discussed.

E. Litvinova; B. A. Brown; D. -L. Fang; T. Marketin; R. G. T. Zegers

2014-02-04T23:59:59.000Z

107

Comparison of the response of two and four-stroke diesel-generator sets to transient loading  

E-Print Network [OSTI]

COMPARISON OF THE RESPONSE OF TWO AND FOUR-STROKE DIESEL-GENERATOR SETS TO TRANSIENT LOADING A Thesis by KENNETH RAY WILLETT Submitted to the Graduate College of Texas Ai!M University in partial fulfillment of the requirement for the degree... of MASTER OF SCIENCE December 1979 Major Subject: Mechanical Engineering COMPARISON OF THE RESPONSE OF TWO AND FOUR-STROKE DIESEL-GENERATOR SETS TO TRANSIENT LOADING A Thesis by KENNETH RAV MILLETT Approved as to style and content by: ~~m J'V (Cha1...

Willett, Kenneth Ray

1979-01-01T23:59:59.000Z

108

Adiabatic electron response and solitary wave generation by trapped particle nonlinearity in a hydrogen plasma  

SciTech Connect (OSTI)

The finite amplitude ion acoustic waves that trap electrons modify the structure of the evolving nonlinear soliton solutions. In the numerical simulations, self-consistently generated solitary waves are studied that emerge as a result of a current driven microinstability growing the ion acoustic mode in a collisionless Vlasov plasma. The growth saturates as a result of nonlinear effects governed by a combination of nonlinearities originating from the hydrodynamic model and kinetic particle trapping effects. The resulting solitary waves also coexist with a finite current and an electron plasma wave capable of perturbing the trapping potential. The results of multiscale simulation are analyzed and characterized following the kinetic prescription of undamped trapped particle mode in the form of phase space vortex solutions that are generalized form of Sagdeev's solitons and obey the solutions of a modified Korteweg-de Vries equation, accounting for a stronger nonlinearity originating from the electron trapping.

Mandal, Debraj; Sharma, Devendra [Institute for Plasma Research, Bhat, Gandhinagar 382428 (India)

2014-10-15T23:59:59.000Z

109

Modeling Building Thermal Response to HVAC Zoning Virginia Smith  

E-Print Network [OSTI]

Modeling Building Thermal Response to HVAC Zoning Virginia Smith Department of Computer Science HVAC systems account for 38% of building energy usage. Studies have indicated at least 5-15% waste due to unoccu- pied spaces being conditioned. Our goal is to minimize this waste by retrofitting HVAC systems

Whitehouse, Kamin

110

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

SciTech Connect (OSTI)

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

Trudnowski, D.J.

1992-12-01T23:59:59.000Z

111

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

SciTech Connect (OSTI)

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

Trudnowski, D.J.

1992-12-01T23:59:59.000Z

112

Modelling fly ash generation for UK power station coals  

SciTech Connect (OSTI)

An in-depth characterization has been made of three UK bituminous coals and the combustion products from these coals when burned at a power station and on a range of experimental combustion facilities. The coals were chosen to represent the range of ash compositions and slagging propensities found at UK power stations. CCSEM analysis of the pulverized coals has been performed to provide quantitative data on the size and chemical composition of individual mineral occurrences, and to determine the nature of the mineral-mineral and mineral-organic associations in the pulverized fuel. In a similar way the size and chemical composition of individual fly ash particle has been determined. The mineral-mineral association information has been used to predict the effects of mineral coalescence, the dominant mineral transformation process for UK power station coals. The CCSEM information correctly identifies the types of mineral-mineral association and hence the predicted effects of coalescence. The limitations of the information are inherent in the analysis of a cross-section, but useful information for the modelling of ash generation may still be obtained.

Wigley, F.; Williamson, J. [Imperial Coll., London (United Kingdom). Dept. of Materials

1996-12-31T23:59:59.000Z

113

A Full Demand Response Model in Co-Optimized Energy and  

SciTech Connect (OSTI)

It has been widely accepted that demand response will play an important role in reliable and economic operation of future power systems and electricity markets. Demand response can not only influence the prices in the energy market by demand shifting, but also participate in the reserve market. In this paper, we propose a full model of demand response in which demand flexibility is fully utilized by price responsive shiftable demand bids in energy market as well as spinning reserve bids in reserve market. A co-optimized day-ahead energy and spinning reserve market is proposed to minimize the expected net cost under all credible system states, i.e., expected total cost of operation minus total benefit of demand, and solved by mixed integer linear programming. Numerical simulation results on the IEEE Reliability Test System show effectiveness of this model. Compared to conventional demand shifting bids, the proposed full demand response model can further reduce committed capacity from generators, starting up and shutting down of units and the overall system operating costs.

Liu, Guodong [ORNL; Tomsovic, Kevin [University of Tennessee, Knoxville (UTK)

2014-01-01T23:59:59.000Z

114

Thermoelectric Generators for Automotive Waste Heat Recovery Systems Part I: Numerical Modeling  

E-Print Network [OSTI]

Thermoelectric Generators for Automotive Waste Heat Recovery Systems Part I: Numerical Modeling telluride TEMs. Key words: Thermoelectric generators, waste heat recovery, automotive exhaust, skutterudites bismuth telluride are considered for thermoelectric modules (TEMs) for conversion of waste heat from

Xu, Xianfan

115

Finite element decomposition and grid generation for brain modeling and visualization  

E-Print Network [OSTI]

Numerical grid generation is used to provide a framework for brain and neuron visualization. Smoothing spline surfaces are fit to contour data to generate 3D solid model reconstruction of brain tissues. Finite element methods are then used...

Batte, David Allan

2012-06-07T23:59:59.000Z

116

Model-Based Transient Calibration Optimization for Next Generation...  

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

Economy Cost Stability Transient Response Development Time Offline Development Fuzzy Logic Neural-Net Control Predictive Control Emissions Reduction 2005 Detroit Diesel...

117

Electrical faults modeling of the photovoltaic generator Wail Rezgui1  

E-Print Network [OSTI]

The productivity of photovoltaic generators is based on two main factors [1-3]: solar radiation energy which is captured by the generator and direct electrical energy resulting from the conversion of the solar radiation energy by the photovoltaic phenomena. So, the degradation of these two factors means the presence

Boyer, Edmond

118

Benchmarking nuclear models for Gamow-Teller response  

E-Print Network [OSTI]

A comparative study of the nuclear Gamow-Teller response (GTR) within conceptually different state-of-the-art approaches is presented. Three nuclear microscopic models are considered: (i) the recently developed charge-exchange relativistic time blocking approximation (RTBA) based on the covariant density functional theory, (ii) the shell model (SM) with an extended "jj77" model space and (iii) the non-relativistic quasiparticle random-phase approximation (QRPA) with a Brueckner G-matrix effective interaction. We study the physics cases where two or all three of these models can be applied. The Gamow-Teller response functions are calculated for 208-Pb, 132-Sn and 78-Ni within both RTBA and QRPA. The strengths obtained for 208-Pb are compared to data that enables a firm model benchmarking. For the nucleus 132-Sn, also SM calculations are performed within the model space truncated at the level of a particle-hole (ph) coupled to vibration configurations. This allows a consistent comparison to the RTBA where ph+ph...

Litvinova, E; Fang, D -L; Marketin, T; Zegers, R G T

2014-01-01T23:59:59.000Z

119

Demonstrating Fuel Consumption and Emissions Reductions with Next Generation Model-Based Diesel Engine Control  

Broader source: Energy.gov [DOE]

Presents a next generation model-based engine controller that incorporates real-time fuel efficiency optimization and tested under fully transient engine and vehicle operating conditions.

120

A distributed parameter model for the torsional vibration analysis of turbine-generator shafts  

Science Journals Connector (OSTI)

A distributed parameter model is presented for the calculation of torsional vibrations of large turbine-generator shafts, on the basis of electrical analogy...

A. Deri; L. Kiss; G. Toth

1987-01-01T23:59:59.000Z

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


121

Modelling and verification of doubly fed induction generator (DFIG) using real time digital simulator (RTDS).  

E-Print Network [OSTI]

??This master thesis deals with Doubly Fed Induction Generator (DFIG) controller in RSCAD model. The controller in RSCAD is built and designed according to the… (more)

Shafiei, Farhad

2012-01-01T23:59:59.000Z

122

Coupled multiphase flow and closure analysis of repository response to waste-generated gas at the Waste Isolation Pilot Plant (WIPP)  

SciTech Connect (OSTI)

A long-term assessment of the Waste Isolation Pilot Plant (WIPP) repository performance must consider the impact of gas generation resulting from the corrosion and microbial degradation of the emplaced waste. A multiphase fluid flow code, TOUGH2/EOS8, was adapted to model the processes of gas generation, disposal room creep closure, and multiphase (brine and gas) fluid flow, as well as the coupling between the three processes. System response to gas generation was simulated with a single, isolated disposal room surrounded by homogeneous halite containing two anhydrite interbeds, one above and one below the room. The interbeds were assumed to have flow connections to the room through high-permeability, excavation-induced fractures. System behavior was evaluated by tracking four performance measures: (1) peak room pressure; (2) maximum brine volume in the room; (3) total mass of gas expelled from the room; and (4) the maximum gas migration distance in an interbed. Baseline simulations used current best estimates of system parameters, selected through an evaluation of available data, to predict system response to gas generation under best-estimate conditions. Sensitivity simulations quantified the effects of parameter uncertainty by evaluating the change in the performance measures in response to parameter variations. In the sensitivity simulations, a single parameter value was varied to its minimum and maximum values, representative of the extreme expected values, with all other parameters held at best-estimate values. Sensitivity simulations identified the following parameters as important to gas expulsion and migration away from a disposal room: interbed porosity; interbed permeability; gas-generation potential; halite permeability; and interbed threshold pressure. Simulations also showed that the inclusion of interbed fracturing and a disturbed rock zone had a significant impact on system performance.

Freeze, G.A.; Larson, K.W. [INTERA Inc., Austin, TX (United States); Davies, P.B. [Sandia National Laboratories, Albuquerque, NM (United States)

1995-10-01T23:59:59.000Z

123

A Multi-State Model for the Reliability Assessment of a Distributed Generation System via Universal Generating Function  

E-Print Network [OSTI]

renewable technology (e.g. wind or solar, etc.) whose behavior is described by a binary state, working assessment, multi-state modeling, universal generating function #12;2 Notations Solar irradiance Total number of discretized solar irradiance states Discretized solar irradiance at state i Random variable representing

Boyer, Edmond

124

Modeling of thin-film solar thermoelectric generators  

E-Print Network [OSTI]

Recent advances in solar thermoelectric generator (STEG) performance have raised their prospect as a potential technology to convert solar energy into electricity. This paper presents an analysis of thin-film STEGs. ...

Weinstein, Lee Adragon

125

Hypercharge generators in SU(7) grand unification models  

Science Journals Connector (OSTI)

We present a thorough analysis of U(1) generators in all of the nine possible symmetry-breaking patterns that reduce SU(7) down to SUc(3)×SU(2)×U(1). There is one allowed representation that contains three generations of leptons and at least two generations of quarks and satisfies anomaly freedom, reality under SUc(3) and Uem(1), and complexity under SUc(3)×SU(2)×U(1). In addition, three other representations, two having only one and two of the three lepton-quark generations complex with respect to SUc(3)×SU(2)×U(1), and the other having fractionally charged color singlets in pairs embedded in the fundamental representation [7], are also analyzed for completeness.

Kyungsik Kang and In-Gyu Koh

1982-03-15T23:59:59.000Z

126

Uncertainty Analysis of the Adequacy Assessment Model of a Distributed Generation System  

E-Print Network [OSTI]

of evidence theory, the hybrid propagation approach is introduced. A demonstration is given on a DG system enables end-users to install renewable generators (e.g. solar generators and wind turbines) on1 Uncertainty Analysis of the Adequacy Assessment Model of a Distributed Generation System Yanfu Li

Paris-Sud XI, Université de

127

E-Print Network 3.0 - aerosol generator model Sample Search Results  

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

generator model Page: << < 1 2 3 4 5 > >> 1 The Way Forward2 Authors: David Rind, NASA GISS; Ralph A. Kahn, NASA GSFC; Mian Chin, NASA3 Summary: assistance from models, are...

128

Self-consistent modeling of radio-frequency plasma generation in stellarators  

Science Journals Connector (OSTI)

A self-consistent model of radio-frequency (RF) plasma generation in stellarators in the ion cyclotron frequency range is described. The model includes equations ... of electron energy balance takes into account ...

V. E. Moiseenko; Yu. S. Stadnik; A. I. Lysoivan; V. B. Korovin

2013-11-01T23:59:59.000Z

129

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

Science Journals Connector (OSTI)

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

Robert L. Vislocky; J. Michael Fritsch

1995-12-01T23:59:59.000Z

130

Landscape Models and Explanation in Landscape Ecology--A Space for Generative Landscape Science?  

E-Print Network [OSTI]

Landscape Models and Explanation in Landscape Ecology-- A Space for Generative Landscape Science in landscape ecology. We discuss the dual modeling goals of prediction and explanation and identify challenges landscape science is offered as a complementaryapproachtoexplanation, combiningmodelsofcandidateprocesses

Brown, Daniel G.

131

Automatic Sensitivity Analysis of DAE-systems Generated from Equation-Based Modeling Languages  

Science Journals Connector (OSTI)

This paper aims at sensitivity analysis of differential algebraic equation (DAE) systems, generated from mathematical models, specified in equation-based modeling languages. Modern simulation languages (e.g. M...

Atya Elsheikh; Wolfgang Wiechert

2008-01-01T23:59:59.000Z

132

Generation Scheduling for Power Systems with Demand Response and a High Penetration of Wind Energy.  

E-Print Network [OSTI]

??With renewable energy sources and demand response programs expanding in many power systems, traditional unit commitment and economic dispatch approaches are inadequate. The power system… (more)

Liu, Guodong

2014-01-01T23:59:59.000Z

133

Generated using version 3.0 of the official AMS LATEX template Model study of waves generated by convection with direct  

E-Print Network [OSTI]

Generated using version 3.0 of the official AMS LATEX template Model study of waves generated circulation, structure and stability on a global scale. Gravity waves can be generated by convection, the authors examine an event on January 12, 2003, when convective waves were clearly generated by a period

Alexander, M. Joan

134

Cognitive Effects of Physical Models in Engineering Idea Generation  

E-Print Network [OSTI]

of controlled lab studies and qualitative studies is adopted to achieve said goal. The results from the controlled studies show that physical models supplement designers’ erroneous mental models and help them to come up with more ideas satisfying the problem...

Cherickal Viswanathan, Vimal 1983-

2012-08-17T23:59:59.000Z

135

Efficient estimation and ensemble generation in climate modelling  

Science Journals Connector (OSTI)

...conjunction with computationally cheap energy-balance Earth system models (Andronova Schlesinger 2001; Forest et al. 2002...Team. 2006 Multiobjective tuning of grid-enabled earth system models using a non-dominated sorting genetic algorithm...

2007-01-01T23:59:59.000Z

136

Multi-physics modeling of thermoelectric generators for waste...  

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

modeling Material properties and interface information (Experiments) Fluid temperature, Heat transfer coefficient & Pressure drop System temperature & Electric power Thermal...

137

Fault Models and Test Generation for Hardware-Software Covalidation Ian G. Harris  

E-Print Network [OSTI]

use of hardware-software systems in cost-critical and life-critical applications has led to heightenedFault Models and Test Generation for Hardware-Software Covalidation ÂŁ Ian G. Harris Department: Hardware-Software Covalidation, Design Validation, Test Generation, Fault Models Abstract The increasing

Harris, Ian G.

138

ON THE MODELLING OF TSUNAMI GENERATION AND TSUNAMI FREDERIC DIAS  

E-Print Network [OSTI]

process. We also consider an unusual source for tsunami generation: the sinking of a cruise ship. Then we is sometimes less devastating than the subsequent waves. A resonance effect can boost the waves that come later. Tsunami inundation 13 3.1. Run-up amplification 14 3.2. Whirlpool like effect in tsunamis 14 4. Conclusion

Paris-Sud XI, Université de

139

Scenario generation for stochastic programming and simulation: a modelling perspective  

Science Journals Connector (OSTI)

......was built to aid supply chain planning and management in the automobile sector (Escudero et al. 1999a) as well as in the pharmaceutical...SANCHEZ, M. (1998b) SEGEM: a simulation approach for electric generation management. IEEE Trans. Power Syst., 13, 738748......

Nico Di Domenica; Cormac Lucas; Gautam Mitra; Patrick Valente

2009-01-01T23:59:59.000Z

140

Modeling, Analysis, and Control of Demand Response Resources  

E-Print Network [OSTI]

advanced metering and demand response in electricityGoldman, and D. Kathan. “Demand response in U.S. electricity29] DOE. Benefits of demand response in electricity markets

Mathieu, Johanna L.

2012-01-01T23:59:59.000Z

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


141

A turbulence model for buoyant flows based on vorticity generation.  

SciTech Connect (OSTI)

A turbulence model for buoyant flows has been developed in the context of a k-{var_epsilon} turbulence modeling approach. A production term is added to the turbulent kinetic energy equation based on dimensional reasoning using an appropriate time scale for buoyancy-induced turbulence taken from the vorticity conservation equation. The resulting turbulence model is calibrated against far field helium-air spread rate data, and validated with near source, strongly buoyant helium plume data sets. This model is more numerically stable and gives better predictions over a much broader range of mesh densities than the standard k-{var_epsilon} model for these strongly buoyant flows.

Domino, Stefan Paul; Nicolette, Vernon F.; O'Hern, Timothy John; Tieszen, Sheldon R.; Black, Amalia Rebecca

2005-10-01T23:59:59.000Z

142

Mass Market Demand Response and Variable Generation Integration Issues: A Scoping Study  

E-Print Network [OSTI]

are dispatched to follow the load on regular dispatchloads in the energy market, and charge imbalance fees to generators that do not followload are to some degree forecastable on a day-ahead basis, as they typically follow

Cappers, Peter

2012-01-01T23:59:59.000Z

143

Generating audio-responsive video images in real-time for a live symphony performance  

E-Print Network [OSTI]

Multimedia performances, uniting music and interactive images, are a unique form of entertainment that has been explored by artists for centuries. This audio-visual combination has evolved from rudimentary devices generating visuals for single...

Beane, Allison Brooke

2007-09-17T23:59:59.000Z

144

Seismic base isolation: Elastomer characterization, bearing modeling and system response  

SciTech Connect (OSTI)

This paper discusses several major aspects of seismic base isolation systems that employ laminated elastomer bearings. Elastomer constitutive models currently being used to represent the nonlinear elastic and hysteretic behavior are discussed. Some aspects of mechanical characterization testing of elastomers is presented along with representative tests results. The development of a finite element based mesh generator for laminated elastomer bearings is presented. Recent advances in the simulation of base isolated structures to earthquake motions are presented along with a sample problem. 13 refs., 19 figs., 1 tab.

Kulak, R.F.; Wang, C.Y.; Hughes, T.H.

1991-01-01T23:59:59.000Z

145

On some complementary trends in Model transformation generation  

E-Print Network [OSTI]

CIM-PIM-PSM and variants software migration metamodel version changes model building, merging) Close problematics with experience Web semantic, ontology alignment, schema matching techniques Database

Paris-Sud XI, Université de

146

Automatic Generation of Transaction-Level Models for Rapid Design Space Exploration  

E-Print Network [OSTI]

Automatic Generation of Transaction-Level Models for Rapid Design Space Exploration Dongwan Shin space, designers use models which are evaluated through simulation. Typically, these models are manually accuracies, models are written at low levels of abstraction with resulting slow simulation performance

California at Irvine, University of

147

Optimum Generation Scheduling Based Dynamic Price Making for Demand Response in a Smart Power Grid  

Science Journals Connector (OSTI)

Smart grid is a recently growing area of research including optimum and reliable operation of bulk power grid from production to end-user premises. Demand side activities like demand response (DR) for enabling co...

Nikolaos G. Paterakis; Ozan Erdinc…

2014-01-01T23:59:59.000Z

148

MeTAGeM-Trace: Improving trace generation in model transformation by leveraging the role of transformation models  

Science Journals Connector (OSTI)

Abstract In the context of Model-Driven Engineering (MDE), generation of traces can be automated using the implicit traceability relationships contained in any model transformation. Besides, if transformations are developed adopting a Model-Driven Engineering (MDE) approach, i.e. promoting the role of models and the level of automation, model transformation will benefit from the promised advantages of MDE in terms of less costly software development while reducing the inherent complexity of coding model transformations. To put these ideas into practice, this work introduces MeTAGeM-Trace, the first prototype of an EMF-based toolkit for the MDD of model-to-model transformations which supports trace generation, i.e. it allows developing model transformations that produce not only the corresponding target models, but also a trace model between the elements of the source and target models involved in the transformation.

Álvaro Jiménez; Juan M. Vara; Verónica A. Bollati; Esperanza Marcos

2015-01-01T23:59:59.000Z

149

Scenario generation for stochastic programming and simulation: a modelling perspective  

Science Journals Connector (OSTI)

......models Artificial Neural gas Neural networks Supply...Paper 01-04. Nicosia, Cyprus: HERMES Center of Excellence...Management, University of Cyprus. JORDAN, W. & TURNQUIST...1991) A "neural-gas" network learns topologies...A decision model for natural oil buying policy under......

Nico Di Domenica; Cormac Lucas; Gautam Mitra; Patrick Valente

2009-01-01T23:59:59.000Z

150

Generating and Analyzing Symbolic Traces of Simulink/Stateflow Models  

E-Print Network [OSTI]

implies that the performance of the analysis would degrade rapidly with the increasing size of the model that enables the development, testing, and rapid prototyping of control software, supported by automated code of these models is loosely defined in terms of a simulation engine. The lack of clearly specified semantics makes

Kanade, Aditya

151

Generating and Analyzing Symbolic Traces of Simulink/Stateflow Models  

E-Print Network [OSTI]

of the model and the simulation traces. We propose a new represen­ tation, called the bounded vertex that enables the development, testing, and rapid prototyping of control software, supported by automated code, the semantics of these models is loosely defined in terms of a simulation engine. The lack of clearly specified

Sankaranarayanan, Sriram

152

Modeling Rules of Engagement in Computer Generated Forces Rick Evertsz  

E-Print Network [OSTI]

approach, ROE are defined as meta-knowledge that act as a constraint on the tactical choices selected. A key problem in modeling how military personnel behave during a conflict is to understand how ROE does not model the following factors: · ROE, · how a person selects a tactic within the scope

Ritter, Frank

153

Power System Generation and Inter-Connection Planning Model (SUPER) | Open  

Open Energy Info (EERE)

Power System Generation and Inter-Connection Planning Model (SUPER) Power System Generation and Inter-Connection Planning Model (SUPER) Jump to: navigation, search Tool Summary Name: Power System Generation and Inter-Connection Planning Model (SUPER) Agency/Company /Organization: Latin American Energy Organization Sector: Energy Focus Area: Renewable Energy, Hydro Topics: Resource assessment Resource Type: Software/modeling tools Website: www.olade.org/superEn.html References: SUPER website [1] "This model is useful for multi-year electricity system planning studies, making it possible to analyze, optimize, simulate and develop hydrothermal power system expansion plans." References ↑ "SUPER website" Retrieved from "http://en.openei.org/w/index.php?title=Power_System_Generation_and_Inter-Connection_Planning_Model_(SUPER)&oldid=329

154

Vortex and gap generation in gauge models of graphene  

E-Print Network [OSTI]

Effective quantum field theoretical continuum models for graphene are investigated. The models include a complex scalar field and a vector gauge field. Different gauge theories are considered and their gap patterns for the scalar, vector, and fermion excitations are investigated. Different gauge groups lead to different relations between the gaps, which can be used to experimentally distinguish the gauge theories. In this class of models the fermionic gap is a dynamic quantity. The finite-energy vortex solutions of the gauge models have the flux of the "magnetic field" quantized, making the Bohm-Aharonov effect active even when external electromagnetic fields are absent. The flux comes proportional to the scalar field angular momentum quantum number. The zero modes of the Dirac equation show that the gauge models considered here are compatible with fractionalization.

O. Oliveira; C. E. Cordeiro; A. Delfino; W. de Paula; T. Frederico

2010-12-21T23:59:59.000Z

155

SPUF - a simple polyurethane foam mass loss and response model.  

SciTech Connect (OSTI)

A Simple PolyUrethane Foam (SPUF) mass loss and response model has been developed to predict the behavior of unconfined, rigid, closed-cell, polyurethane foam-filled systems exposed to fire-like heat fluxes. The model, developed for the B61 and W80-0/1 fireset foam, is based on a simple two-step mass loss mechanism using distributed reaction rates. The initial reaction step assumes that the foam degrades into a primary gas and a reactive solid. The reactive solid subsequently degrades into a secondary gas. The SPUF decomposition model was implemented into the finite element (FE) heat conduction codes COYOTE [1] and CALORE [2], which support chemical kinetics and dynamic enclosure radiation using 'element death.' A discretization bias correction model was parameterized using elements with characteristic lengths ranging from 1-mm to 1-cm. Bias corrected solutions using the SPUF response model with large elements gave essentially the same results as grid independent solutions using 100-{micro}m elements. The SPUF discretization bias correction model can be used with 2D regular quadrilateral elements, 2D paved quadrilateral elements, 2D triangular elements, 3D regular hexahedral elements, 3D paved hexahedral elements, and 3D tetrahedron elements. Various effects to efficiently recalculate view factors were studied -- the element aspect ratio, the element death criterion, and a 'zombie' criterion. Most of the solutions using irregular, large elements were in agreement with the 100-{micro}m grid-independent solutions. The discretization bias correction model did not perform as well when the element aspect ratio exceeded 5:1 and the heated surface was on the shorter side of the element. For validation, SPUF predictions using various sizes and types of elements were compared to component-scale experiments of foam cylinders that were heated with lamps. The SPUF predictions of the decomposition front locations were compared to the front locations determined from real-time X-rays. SPUF predictions of the 19 radiant heat experiments were also compared to a more complex chemistry model (CPUF) predictions made with 1-mm elements. The SPUF predictions of the front locations were closer to the measured front locations than the CPUF predictions, reflecting the more accurate SPUF prediction of mass loss. Furthermore, the computational time for the SPUF predictions was an order of magnitude less than for the CPUF predictions.

Hobbs, Michael L.; Lemmon, Gordon H.

2003-07-01T23:59:59.000Z

156

A Chemical Class-Based Approach to Predictive Model Generation  

Science Journals Connector (OSTI)

The table shows, for each trial, the number of molecules used in the classification, the number of classes generated, the number of molecules successfully classified (i.e., the number that do not become singletons), the average number of molecules per class, and the class redundancy (the number of classes, on average, in which each molecule appears). ... Given the greater apparent reliability of the reduced-default versus the full-default results, the class-based approach appears even more favorable. ... rules that classify objects into similar categories or, in this case, structures into groups of mols. ...

David W. Miller

2003-01-24T23:59:59.000Z

157

Accurate resistive bridge fault modeling, simulation, and test generation  

E-Print Network [OSTI]

Resistive bridging faults in CMOS combinational circuits are studied in this work. Bridging faults are modeled using HSPICE circuit simulation of the various types of bridging faults that can occur in CMOS combinational circuits. The results...

Sar-Dessai, Vijay Ramesh

2012-06-07T23:59:59.000Z

158

Microgrid dynamic response during the pre-planned and forced islanding processes involving DFIG and synchronous generators  

Science Journals Connector (OSTI)

Abstract In this article, some important issues associated to the dynamic response of a microgrid system are addressed. In particular, issues related to the pre-planned islanding mode of operation, load shedding, loss of one generator and the failure to shed an unforeseen connected load are studied. In this context, the dynamic behavior results of a Doubly-Fed Induction Generator (DFIG) and two other synchronous sources (a diesel and a small hydro-generator) within a microgrid, are presented. The overloading condition can occur due to causes ranging from poor load schedule, inadequate switching of circuits within the microgrid, illegal connection of load by some low voltage consumers, etc. In most of the simulated conditions the microgrid generators resumed their operation after clearing the disturbance. However, under some critical conditions, like in the case of a considerably large load connected, the microgrid was unable to return to the pre-fault condition and even failed while trying to gain stability for this new load condition. Because microgrid systems normally have low equivalent inertia, it was also observed that very little to practically no overload can be accepted by the generators.

Ricardo Leon Vasquez-Arnez; Dorel Soares Ramos; Tesoro Elena Del Carpio-Huayllas

2014-01-01T23:59:59.000Z

159

A MODEL FOR THE FLEET SIZING OF DEMAND RESPONSIVE TRANSPORTATION SERVICES WITH TIME WINDOWS  

E-Print Network [OSTI]

A MODEL FOR THE FLEET SIZING OF DEMAND RESPONSIVE TRANSPORTATION SERVICES WITH TIME WINDOWS Marco a demand responsive transit service with a predetermined quality for the user in terms of waiting time models; Continuous approximation models; Paratransit services; Demand responsive transit systems. #12;3 1

Dessouky, Maged

160

The modelling of biochemical-thermal coupling effect on gas generation and transport in MSW landfill  

Science Journals Connector (OSTI)

The landfill gas generation was investigated based on the theories of the thermodynamics, microbial dynamics and chemical dynamics. The coupling model was developed for describing the gas transport and heat release. And the relationship between the gas generation rate and the temperature was proposed. The parameters in the gas generation model were obtained by bioreactor test in order to evaluate the volume of gas production of the Erfeishan landfill in China. The simulation results shown that the operating life of the landfill will be overestimated if the model does not consider the thermal effect during degradation of the solid substrate.

Liu Lei; Liang Bing; Xue Qiang; Zhao Ying; Yang Chun

2011-01-01T23:59:59.000Z

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


161

Waste generation process modeling and analysis for fuel reprocessing technologies  

SciTech Connect (OSTI)

Estimates of electric power generation requirements for the next century, even when taking the most conservative tack, indicate that the United States will have to increase its production capacity significantly. If the country determines that nuclear power will not be a significant component of this production capacity, the nuclear industry will have to die, as maintaining a small nuclear component will not be justifiable. However, if nuclear power is to be a significant component, it will probably require some form of reprocessing technology. The once-through fuel cycle is only feasible for a relatively small number of nuclear power plants. If we are maintaining several hundred reactors, the once-through fuel cycle is more expensive and ethically questionable.

Kornreich, D. E. (Drew E.); Koehler, A. C. (Andrew C.); Farman, Richard F.

2002-01-01T23:59:59.000Z

162

Steam generator sludge pile model boiler testing: sludge characterization. [PWR  

SciTech Connect (OSTI)

As part of a program to understand the thermal and hydraulic transport process that can lead to chemical concentration in sludge piles on the tubesheet in a steam generator, the chemical composition and physical properties of eight sludges and several simulants were determined. Analyses performed by emission and x-ray fluorescence spectroscopy indicated that most of the sludges were mainly composed of iron oxides, copper, and other elements at trace levels. X-ray diffraction measurements identified iron to exist in the form of magnetite and copper to exist in the form of a metal. The densities, porosity, particle size, surface area, pore size distribution, and hydrodynamic permeabilities were determined on all plant sludges and selected simulants. Wide variations were observed in the physical measurements of the different plant sludges.

Becker, L.F. Jr.; Esposito, J.N.

1981-09-01T23:59:59.000Z

163

Simulated movement of musculature in a computer generated model  

E-Print Network [OSTI]

properly when animated. The documentation of this process will be presented as a web-based tutorial for students and modelers. 1. 3 MOTIVATION: WHERE TO BUILD-IN MUSCLE DEFORMATION When building a character one must distinguish the areas where muscle... IMPORTANCE OF PROCESS The process required in making the steps to build parts of a character that exhibit muscle deformation will be documented in a web based tutorial. The tutorial will provide students and 3D modelers alike a template to discover...

Ten Wolde, Kristian Bernard

2000-01-01T23:59:59.000Z

164

Numerical Modeling of Internal Tide Generation along the Hawaiian Ridge  

Science Journals Connector (OSTI)

Internal M2 tides near Hawaii are investigated with a two-dimensional, two-layer numerical model. It is seen that along the Hawaiian Ridge barotropic tidal energy is transformed into baroclinic internal tides that propagate in both northeast and ...

S. K. Kang; M. G. G. Foreman; W. R. Crawford; J. Y. Cherniawsky

2000-05-01T23:59:59.000Z

165

MULTISPECTRAL SYNTHETIC SCENE GENERATION USING ATMOSPHERIC PROPAGATION AND THERMODYNAMIC MODELS  

E-Print Network [OSTI]

of the Central Intelligence Agency, the US Department of Energy, NASA's Jet Propulsion Laboratory, ITEK a requirement. This document represents the current status of a first-principles physics-based synthetic image behavior in a natural environment, and the propagation of energy through the atmosphere. The model

Salvaggio, Carl

166

Radiative Generation of Quark Masses and Mixing Angles in the Two Higgs Doublet Model  

E-Print Network [OSTI]

We present a framework to generate the quark mass hierarchies and mixing angles by extending the Standard Model with one extra Higgs doublet. The charm and strange quark masses are generated by small quantum effects, thus explaining the hierarchy between the second and third generation quark masses. All the mixing angles are also generated by small quantum effects: the Cabibbo angle is generated at zero-th order in perturbation theory, while the remaining off-diagonal entries of the Cabibbo-Kobayashi-Maskawa matrix are generated at first order, hence explaining the observed hierarchy $|V_{ub}|,|V_{cb}|\\ll |V_{us}|$. The values of the radiatively generated parameters depend only logarithmically on the heavy Higgs mass, therefore this framework can be reconciled with the stringent limits on flavor violation by postulating a sufficiently large new physics scale.

Alejandro Ibarra; Ana Solaguren-Beascoa

2014-07-04T23:59:59.000Z

167

Smart Finite State Devices: A Modeling Framework for Demand Response Technologies  

E-Print Network [OSTI]

We introduce and analyze Markov Decision Process (MDP) machines to model individual devices which are expected to participate in future demand-response markets on distribution grids. We differentiate devices into the following four types: (a) optional loads that can be shed, e.g. light dimming; (b) deferrable loads that can be delayed, e.g. dishwashers; (c) controllable loads with inertia, e.g. thermostatically-controlled loads, whose task is to maintain an auxiliary characteristic (temperature) within pre-defined margins; and (d) storage devices that can alternate between charging and generating. Our analysis of the devices seeks to find their optimal price-taking control strategy under a given stochastic model of the distribution market.

Turitsyn, Konstantin; Ananyev, Maxim; Chertkov, Michael

2011-01-01T23:59:59.000Z

168

Model-driven dynamic generation of context-adaptive web user interfaces  

Science Journals Connector (OSTI)

The systematic development of user interfaces that enhance interaction quality by adapting to the context of use is a desirable, but also highly challenging task. This paper examines to which extent contextual knowledge can be systematically incorporated ... Keywords: context-aware web user interfaces, model interpretation, model-driven user interface generation, ontology-based Modeling, parameterization, semantically enriched SOA, web service integration

Steffen Lohmann; J. Wolfgang Kaltz; Jürgen Ziegler

2006-10-01T23:59:59.000Z

169

A Generative Approach to Model Interpreter Evolution Jing Zhang, Jeff Gray, and Yuehua Lin  

E-Print Network [OSTI]

to a simulation engine or analysis tool [12]. Generally speaking, a meta- model is relatively stable and seldomA Generative Approach to Model Interpreter Evolution Jing Zhang, Jeff Gray, and Yuehua Lin} @ cis.uab.edu Abstract. Domain-specific modeling techniques are being adopted with more frequency

Gray, Jeffrey G.

170

Dynamic Simulation Studies of the Frequency Response of the Three U.S. Interconnections with Increased Wind Generation  

E-Print Network [OSTI]

Generator (Conventional Induction Generator): is connectedsquirrel cage" induction generator directly connected to theThe conventional induction generator cannot provide reactive

Mackin, Peter

2011-01-01T23:59:59.000Z

171

Modelling and Analysis of Variable Speed Wind Turbines with Induction Generator during Grid  

E-Print Network [OSTI]

Modelling and Analysis of Variable Speed Wind Turbines with Induction Generator during Grid Fault Wind Turbines with Induction Generator during Grid Fault by Sigrid M. Bolik Institute of Energy turbine technology has undergone rapid developments. Growth in size and the optimization of wind turbines

Hansen, René Rydhof

172

Control Oriented Modeling and System Identification of a Diesel Generator Set (Genset)  

E-Print Network [OSTI]

Cheong, Perry Y. Li and Jicheng Xia Abstract-- A diesel generator set (genset) refers to a diesel engineControl Oriented Modeling and System Identification of a Diesel Generator Set (Genset) Kai Loon dependence on the field current; the engine speed governor is found to be a first order controller

Li, Perry Y.

173

Internal tide generation at the continental shelf modelled using a modal decomposition  

E-Print Network [OSTI]

Internal tide generation at the continental shelf modelled using a modal decomposition: two are required. Using this formulation, we calculate the internal tide generated by a time-periodic barotropic-layer or uniformly stratified. For the two-layer case, we derive expressions for the shoreward and oceanward energy

174

Evaluation of the Linear-Nonthreshold Dose-Response Model  

Science Journals Connector (OSTI)

National Council on Radiation Protection and Measurements MD: NCRP (2001) 287 pp, $50.00 Lively debate continues on the nature of the dose-response relationship for the excess risk of cancer following exposure to ionising radiation at low doses and/or low dose rates. Clearly, these are the exposure conditions of principal importance to radiological protection. Presently, for the purposes of radiological protection, the assumption is made that the underlying dose-response relationship is linear-quadratic with no threshold, and that in the low dose and/or low dose rate region this curve can be approximated by a straight line with a gradient half that of the linear relationship which (for cancers other than leukaemia) is appropriate for moderate to high doses received at high dose rates. This, in essence, is the `linear-nonthreshold (LNT) dose-response model' referred to in the title of NCRP Report No 136. The debate centres on whether this model is appropriate or not; but it is complicated by the marked polarisation of those that disagree with this model and with the vehemence that characterises the debate. At one extreme are those who argue for a supra-linear dose-response and claim that the assumption of linearity seriously underestimates the risks to health of low dose exposures. At the other extreme are those who argue for a threshold in the dose-response at some non-zero dose, or even for beneficial effects of irradiation at low doses (`radiation hormesis'). Understandably, the former viewpoint tends to be held by anti-nuclear activists whereas the latter tends to be adopted by pro-nuclear pressure groups, and this political backdrop does not assist a balanced discussion of this important issue. In the USA, considerable lobbying exists from the threshold/hormesis camp, and this can also be seen in France and Japan. Unfortunately, although there are reasonable scientific points to be made in favour of mechanisms that ameliorate the effects of radiation at low doses, the attitude struck by some in this camp is that support of the `LNT hypothesis' is quite unreasonable and flies in the face of the evidence. Obviously, this point of view brings into question the motivation of those who support the position presently adopted by, for example, the International Commission on Radiological Protection, and leads to acrimonious and unconstructive discussions. The same is true of the other extreme wing, where radiological protection is viewed as being disturbingly lax as a result of pressure being brought to bear by the `military-industrial complex', with scientists being complicit in this conspiracy. It is into this storm that NCRP has bravely marched in publishing its Report No 136. The re-evaluation of the scientific evidence reported in NCRP Report No 136 was carried out by Scientific Committee 1-6 of the NCRP which was charged to `reassess the weight of scientific evidence for and against the linear-nonthreshold dose-response model, without reference to associated policy implications'. In essence, the linear-nonthreshold dose-response model is based upon the assumption that biological damage which, if unrepaired, could lead to cancer is directly proportional to dose throughout the range of dose and dose rates of importance in routine radiological protection. Not only did NCRP Scientific Committee 1-6 deliberate amongst themselves, but the committee sought and obtained written and oral opinion from several scientists in the USA who held different views on the subject. The report begins by examining the way in which radiation energy is deposited in cells. It concludes that at low doses and low dose rates the relevant biological damage would be produced by a `single hit' because of the spatial and temporal sparseness of the events causing the damage. Since cancer is considered to be monoclonal (single cell) in origin, this suggests that the dose-response is linear at low doses with no threshold. However, it is possible that the whole organism may be more capable of repairing damage at low doses and low dose rates, which would m

175

Data Integration for the Generation of High Resolution Reservoir Models  

SciTech Connect (OSTI)

The goal of this three-year project was to develop a theoretical basis and practical technology for the integration of geologic, production and time-lapse seismic data in a way that makes best use of the information for reservoir description and reservoir performance predictions. The methodology and practical tools for data integration that were developed in this research project have been incorporated into computational algorithms that are feasible for large scale reservoir simulation models. As the integration of production and seismic data require calibrating geological/geostatistical models to these data sets, the main computational tool is an automatic history matching algorithm. The following specific goals were accomplished during this research. (1) We developed algorithms for calibrating the location of the boundaries of geologic facies and the distribution of rock properties so that production and time-lapse seismic data are honored. (2) We developed and implemented specific procedures for conditioning reservoir models to time-lapse seismic data. (3) We developed and implemented algorithms for the characterization of measurement errors which are needed to determine the relative weights of data when conditioning reservoir models to production and time-lapse seismic data by automatic history matching. (4) We developed and implemented algorithms for the adjustment of relative permeability curves during the history matching process. (5) We developed algorithms for production optimization which accounts for geological uncertainty within the context of closed-loop reservoir management. (6) To ensure the research results will lead to practical public tools for independent oil companies, as part of the project we built a graphical user interface for the reservoir simulator and history matching software using Visual Basic.

Albert Reynolds; Dean Oliver; Gaoming Li; Yong Zhao; Chaohui Che; Kai Zhang; Yannong Dong; Chinedu Abgalaka; Mei Han

2009-01-07T23:59:59.000Z

176

An Arnoldi Approach for Generation of ReducedOrder Models for Turbomachinery  

E-Print Network [OSTI]

An Arnoldi Approach for Generation of Reduced­Order Models for Turbomachinery Karen Willcox used for aeroelastic analyses of turbomachinery. The flow is usually assumed to be two

Peraire, Jaime

177

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

E-Print Network [OSTI]

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

178

Distributed Central Pattern Generator Model for Robotics Application Based on Phase Sensitivity Analysis  

Science Journals Connector (OSTI)

A method is presented to predict phase relationships between coupled phase oscillators. As an illustration of how the method can be applied, a distributed Central Pattern Generator (CPG) model based on amplitude ...

Jonas Buchli; Auke Jan Ijspeert

2004-01-01T23:59:59.000Z

179

Modeling the final phase of landfill gas generation from long-term observations  

Science Journals Connector (OSTI)

For waste management, methane emissions from landfills and their effect on climate change are of serious concern. Current models for biogas generation that focus on the economic use of the landfill gas are usuall...

Johannes Tintner; Manfred Kühleitner; Erwin Binner; Norbert Brunner…

2012-06-01T23:59:59.000Z

180

Modified landfill gas generation rate model of first-order kinetics and two-stage reaction  

Science Journals Connector (OSTI)

This investigation was carried out to establish a new domestic landfill gas (LFG) generation rate model that takes...L 0), the reaction rate constant in the first stage (K 1), and ...

Jiajun Chen; Hao Wang…

2009-09-01T23:59:59.000Z

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


181

Use of Frequency Response Metrics to Assess the Planning and Operating Requirements for Reliable Integration of Variable Renewable Generation  

SciTech Connect (OSTI)

An interconnected electric power system is a complex system that must be operated within a safe frequency range in order to reliably maintain the instantaneous balance between generation and load. This is accomplished by ensuring that adequate resources are available to respond to expected and unexpected imbalances and restoring frequency to its scheduled value in order to ensure uninterrupted electric service to customers. Electrical systems must be flexible enough to reliably operate under a variety of"change" scenarios. System planners and operators must understand how other parts of the system change in response to the initial change, and need tools to manage such changes to ensure reliable operation within the scheduled frequency range. This report presents a systematic approach to identifying metrics that are useful for operating and planning a reliable system with increased amounts of variable renewable generation which builds on existing industry practices for frequency control after unexpected loss of a large amount of generation. The report introduces a set of metrics or tools for measuring the adequacy of frequency response within an interconnection. Based on the concept of the frequency nadir, these metrics take advantage of new information gathering and processing capabilities that system operators are developing for wide-area situational awareness. Primary frequency response is the leading metric that will be used by this report to assess the adequacy of primary frequency control reserves necessary to ensure reliable operation. It measures what is needed to arrest frequency decline (i.e., to establish frequency nadir) at a frequency higher than the highest set point for under-frequency load shedding within an interconnection. These metrics can be used to guide the reliable operation of an interconnection under changing circumstances.

Eto, Joseph H.; Undrill, John; Mackin, Peter; Daschmans, Ron; Williams, Ben; Haney, Brian; Hunt, Randall; Ellis, Jeff; Illian, Howard; Martinez, Carlos; O'Malley, Mark; Coughlin, Katie; LaCommare, Kristina Hamachi

2010-12-20T23:59:59.000Z

182

Managing Model Data Introduced Uncertainties in Simulator Predictions for Generation IV Systems via Optimum Experimental Design  

SciTech Connect (OSTI)

An optimization technique has been developed to select optimized experimental design specifications to produce data specifically designed to be assimilated to optimize a given reactor concept. Data from the optimized experiment is assimilated to generate posteriori uncertainties on the reactor concept’s core attributes from which the design responses are computed. The reactor concept is then optimized with the new data to realize cost savings by reducing margin. The optimization problem iterates until an optimal experiment is found to maximize the savings. A new generation of innovative nuclear reactor designs, in particular fast neutron spectrum recycle reactors, are being considered for the application of closing the nuclear fuel cycle in the future. Safe and economical design of these reactors will require uncertainty reduction in basic nuclear data which are input to the reactor design. These data uncertainty propagate to design responses which in turn require the reactor designer to incorporate additional safety margin into the design, which often increases the cost of the reactor. Therefore basic nuclear data needs to be improved and this is accomplished through experimentation. Considering the high cost of nuclear experiments, it is desired to have an optimized experiment which will provide the data needed for uncertainty reduction such that a reactor design concept can meet its target accuracies or to allow savings to be realized by reducing the margin required due to uncertainty propagated from basic nuclear data. However, this optimization is coupled to the reactor design itself because with improved data the reactor concept can be re-optimized itself. It is thus desired to find the experiment that gives the best optimized reactor design. Methods are first established to model both the reactor concept and the experiment and to efficiently propagate the basic nuclear data uncertainty through these models to outputs. The representativity of the experiment to the design concept is quantitatively determined. A technique is then established to assimilate this data and produce posteriori uncertainties on key attributes and responses of the design concept. Several experiment perturbations based on engineering judgment are used to demonstrate these methods and also serve as an initial generation of the optimization problem. Finally, an optimization technique is developed which will simultaneously arrive at an optimized experiment to produce an optimized reactor design. Solution of this problem is made possible by the use of the simulated annealing algorithm for solution of optimization problems. The optimization examined in this work is based on maximizing the reactor cost savings associated with the modified design made possible by using the design margin gained through reduced basic nuclear data uncertainties. Cost values for experiment design specifications and reactor design specifications are established and used to compute a total savings by comparing the posteriori reactor cost to the a priori cost plus the cost of the experiment. The optimized solution arrives at a maximized cost savings.

Paul J. Turinsky; Hany S.Abdel-Khalik; Tracy E. Stover

2011-03-31T23:59:59.000Z

183

An electromagnetic and thermodynamic lumped parameter model of an explosively driven regenerative magnetohydrodynamic generator  

SciTech Connect (OSTI)

The objective of this research is to develop a simple, yet accurate, lumped parameter mathematical model for an explosively driven magnetohydrodynamic generator that can predict the pulse power variables of voltage and current from startup through regenerative operation. The inputs to the model will be the plasma properties entering the generator as predicted by the explosive shock model of Reference [1]. The strategy used was to simplify electromagnetic and thermodynamic three dimensional effects into a zero dimensional model. The model will provide a convenient tool for researchers to optimize designs to be used in pulse power applications. The model is validated using experimental data of Reference [1]. An overview of the operation of the explosively driven generator is first presented. Then a simplified electrical circuit model that describes basic performance of the device is developed. Then a lumped parameter model that incorporates the coupled electromagnetic and thermodynamic effects that govern generator performance is described and developed. The model is based on fundamental physical principles and parameters that were either obtained directly from design data or estimated from experimental data. The model was used to obtain parameter sensitivities and predict beyond the limits observed in the experiments to the levels desired by the potential Department of Defense sponsors. The model identifies process limitations that provide direction for future research.

Morrison, J.L.

1992-12-01T23:59:59.000Z

184

EIA - International Energy Outlook 2008-Appendix J. Models Used To Generate  

Gasoline and Diesel Fuel Update (EIA)

J. Models Used To Generate the IEO2008 Projections J. Models Used To Generate the IEO2008 Projections International Energy Outlook 2008 Appendix J. Models Used To Generate the IEO2008 Projections World Energy Projections Plus (WEPS+) The IEO2008 projections of world energy consumption and supply were generated from EIAÂ’s World Energy Projections Plus (WEPS+) model. WEPS+ is a system of sectoral energy models that provide a loosely linked, integrated equilibrium modeling system. It is used primarily to provide alternative energy projections based on different assumptions for GDP growth and fossil fuel prices. The WEPS+ common platform allows the models to communicate with each other and provides a comprehensive, central series of output reports for analysis. For IEO2008, WEPS+ incorporates a separate transportation sector model with an extensive level of detail for modes and vehicle types. WEPS+ also incorporates some additional detail on industrial energy use in China and India, additional detail on end-use electricity consumption, and an interface to the System for the Analysis of Global Energy Markets/Global Electricity Module (see below) for generation, capacity, and fuel consumption in the electricity sector.

185

A novel optimization sizing model for hybrid solar-wind power generation system  

Science Journals Connector (OSTI)

This paper develops the Hybrid Solar-Wind System Optimization Sizing (HSWSO) model, to optimize the capacity sizes of different components of hybrid solar-wind power generation systems employing a battery bank. The HSWSO model consists of three parts: the model of the hybrid system, the model of Loss of Power Supply Probability (LPSP) and the model of the Levelised Cost of Energy (LCE). The flow chart of the HSWSO model is also illustrated. With the incorporated HSWSO model, the sizing optimization of hybrid solar-wind power generation systems can be achieved technically and economically according to the system reliability requirements. A case study is reported to show the importance of the HSWSO model for sizing the capacities of wind turbines, PV panel and battery banks of a hybrid solar-wind renewable energy system.

Hongxing Yang; Lin Lu; Wei Zhou

2007-01-01T23:59:59.000Z

186

Theoretical model for plasma expansion generated by hypervelocity impact  

SciTech Connect (OSTI)

The hypervelocity impact experiments of spherical LY12 aluminum projectile diameter of 6.4?mm on LY12 aluminum target thickness of 23?mm have been conducted using a two-stage light gas gun. The impact velocity of the projectile is 5.2, 5.7, and 6.3?km/s, respectively. The experimental results show that the plasma phase transition appears under the current experiment conditions, and the plasma expansion consists of accumulation, equilibrium, and attenuation. The plasma characteristic parameters decrease as the plasma expands outward and are proportional with the third power of the impact velocity, i.e., (T{sub e}, n{sub e})???v{sub p}{sup 3}. Based on the experimental results, a theoretical model on the plasma expansion is developed and the theoretical results are consistent with the experimental data.

Ju, Yuanyuan; Zhang, Qingming, E-mail: qmzhang@bit.edu.cn; Zhang, Dongjiang; Long, Renrong; Chen, Li; Huang, Fenglei [State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing 100081 (China); Gong, Zizheng [National Key Laboratory of Science and Technology on Reliability and Environment Engineering, Beijing Institute of Spacecraft Environment Engineering, Beijing 100094 (China)

2014-09-15T23:59:59.000Z

187

A Hierarchical Task Model for Dispatching in Computer-Assisted Demand-Responsive Paratransit Operation  

E-Print Network [OSTI]

A Hierarchical Task Model for Dispatching in Computer- Assisted Demand-Responsive Paratransit Model for Dispatching in Computer-Assisted Demand-Responsive Paratransit Operation ABSTRACT, Dispatch Training #12;1 INTRODUCTION Demand-responsive paratransit service is on the rise. For example

Dessouky, Maged

188

Modelling the long-term response of stream water chemistry to  

E-Print Network [OSTI]

Modelling the long-term response of stream water chemistry to atmospheric pollution and forestry-term response of stream water chemistry to atmospheric pollution and forestry practices in Galloway, SW Scotland.forestry.gov.uk/fr/acidification #12;4 #12;Modelling the long-term response of stream water chemistry to atmospheric pollution

189

SGHTL-34, a thyrotrophin-responsive immortalised human thyroid cell line generated by transfection  

Science Journals Connector (OSTI)

Normal human thyrocytes were immortalised by electroporation-mediated transfection with the plasmid pSVSneo. One resultant cell line (SGHTL-34) contains approximately 10 copies of simian virus 40 (SV40) early region incorporated into the genome and has been in continuous monolayer culture for 9 months. SGHTL-34 cells grow rapidly (doubling time 30 h) and contain cytokeratin filaments. They demonstrate a morphological change in response to thyrotrophin (TSH) and possess a TSH- and forskolin-sensitive adenylate cyclase, the thresholds for stimulation being 10 ?U/ml bovine TSH and 10?7 M forskolin. The development of this novel human thyrocyte cell line may allow further study of the regulation of human thyroid growth and differentiation.

G.StJ. Whitley; S.S. Nussey; A.P. Johnstone

1987-01-01T23:59:59.000Z

190

Demand Response Analysis in Smart Grids Using Fuzzy Clustering Model  

Science Journals Connector (OSTI)

This paper focuses on an analysis of demand response in a smart grid context, presenting the ... A fuzzy subtractive clustering method is applied to demand response on several domestic consumption scenarios and r...

R. Pereira; A. Fagundes; R. Melício…

2013-01-01T23:59:59.000Z

191

Automatic generation of CSP || B skeletons from xUML models  

E-Print Network [OSTI]

Automatic generation of CSP || B skeletons from xUML models Edward Turner, Helen Treharne, Steve. CSP B is a formal approach to specification that combines CSP and B. In this paper we present our tool that automatically trans- lates a subset of executable UML (xUML) models into CSP B, for the purpose of verification

Doran, Simon J.

192

Resistive Bridge Fault Modeling,Simulationand Test Generation Vijay R. Sar-Dessai  

E-Print Network [OSTI]

Resistive Bridge Fault Modeling,Simulationand Test Generation Vijay R. Sar-Dessai Intel Corporation.sar-dessai@intel.com Abstract In this work' we develop models of resistive bridging faults and study thefault coverage on ISCAS85 circuits of different test sets using resistive and zero-ohm bridges at different supply voltages

Walker, Duncan M. "Hank"

193

Artificial neural network based models for forecasting electricity generation of grid connected solar PV power plant  

Science Journals Connector (OSTI)

This paper presents an artificial neural network (ANN) approach for forecasting the performance of electric energy generated output from a working 25-kWp grid connected solar PV system and a 100-kWp grid connected PV system installed at Minicoy Island of Union Territory of Lakshadweep Islands. The ANN interpolates among the solar PV generation output and relevant parameters such as solar radiation, module temperature and clearness index. In this study, three ANN models are implemented and validated with reasonable accuracy on real electric energy generation output data. The first model is univariate based on solar radiation and the output values. The second model is a multivariate model based on module temperature along with solar radiation. The third model is also a multivariate model based on module temperature, solar radiation and clearness index. A forecasting performance measure such as percentage root mean square error has been presented for each model. The second model, which gives the most accurate results, has been used in forecasting the generation output for another PV system with similar accuracy.

Imtiaz Ashraf; A. Chandra

2004-01-01T23:59:59.000Z

194

Building ventilation : a pressure airflow model computer generation and elements of  

E-Print Network [OSTI]

Building ventilation : a pressure airflow model computer generation and elements of validation H - design #12;1- Introduction Regarding the number of airflow network models found in building publications Abstract : The calculation of airflows is of great importance for detailed building thermal simulation

Paris-Sud XI, Université de

195

Investigation of techniques to build generation system models for reliability evaluation  

E-Print Network [OSTI]

, the techniques to build this model are investigated in this thesis. By using the conventional unit addition algorithm, the number of states generated is large and this effects the time taken to build this model The reduction in the number of states results...

Gubbala, Nagalakshmi V.

2012-06-07T23:59:59.000Z

196

Revisiting the Steam-Boiler Case Study with LUTESS : Modeling for Automatic Test Generation  

E-Print Network [OSTI]

model and to assess the difficulty of such a process in a realistic case study. The steam boiler caseRevisiting the Steam-Boiler Case Study with LUTESS : Modeling for Automatic Test Generation Grenoble, 2Laboratoire de Conception et d'Intégration des Systèmes Abstract LUTESS is a testing tool

Boyer, Edmond

197

Efficiency and accuracy of the perturbation response coefficient generation method for whole core comet calculations in BWR and CANDU configurations  

SciTech Connect (OSTI)

The coarse mesh transport method (COMET) is a highly accurate and efficient computational tool which predicts whole-core neutronics behaviors for heterogeneous reactor cores via a pre-computed eigenvalue-dependent response coefficient (function) library. Recently, a high order perturbation method was developed to significantly improve the efficiency of the library generation method. In that work, the method's accuracy and efficiency was tested in a small PWR benchmark problem. This paper extends the application of the perturbation method to include problems typical of the other water reactor cores such as BWR and CANDU bundles. It is found that the response coefficients predicted by the perturbation method for typical BWR bundles agree very well with those directly computed by the Monte Carlo method. The average and maximum relative errors in the surface-to-surface response coefficients are 0.02%-0.05% and 0.06%-0.25%, respectively. For CANDU bundles, the corresponding quantities are 0.01%-0.05% and 0.04% -0.15%. It is concluded that the perturbation method is highly accurate and efficient with a wide range of applicability. (authors)

Zhang, D.; Rahnema, F. [Georgia Institute of Technology, 770 State Street NW, Atlanta, GA 30332-0745 (United States)

2013-07-01T23:59:59.000Z

198

Comparison of analytical models for zonal flow generation in ion-temperature-gradient mode turbulence  

SciTech Connect (OSTI)

During the past years the understanding of the multi scale interaction problems have increased significantly. However, at present there exists a flora of different analytical models for investigating multi scale interactions and hardly any specific comparisons have been performed among these models. In this work two different models for the generation of zonal flows from ion-temperature-gradient (ITG) background turbulence are discussed and compared. The methods used are the coherent mode coupling model and the wave kinetic equation model (WKE). It is shown that the two models give qualitatively the same results even though the assumption on the spectral difference is used in the (WKE) approach.

Anderson, J.; Miki, K.; Uzawa, K.; Li, J.; Kishimoto, Y. [Dept. Fundamental Energy Science, School of Energy Science, Kyoto University, Gokasho, Uji, Kyoto, 611-0011 (Japan)

2006-11-30T23:59:59.000Z

199

Steam generator steady-state model for on-line data validation. [LMFBR  

SciTech Connect (OSTI)

To develop an efficient algorithm for on-line plant-wide data validation and fault identification fast running computer models that adequately describe the different plant processes are required. For example, if the data validation interval is of the order of one second, these models must be running faster than one second. This paper presents a fast running model for steady-state analysis of a once-through LMFBR steam generator. In computer codes like DSNP and SASSYS, the computation time for steady-state analysis of a typical once-through LMFBR steam generator is approx. 5 to 7 seconds. This time imposes excessively long validation intervals.

Tzanos, C.P.

1984-01-01T23:59:59.000Z

200

Model generation of coronary artery bifurcations from CTA and single plane angiography  

SciTech Connect (OSTI)

Purpose: To generate accurate and realistic models of coronary artery bifurcations before and after percutaneous coronary intervention (PCI), using information from two image modalities. Because bifurcations are regions where atherosclerotic plaque appears frequently and intervention is more challenging, generation of such realistic models could be of high value to predict the risk of restenosis or thrombosis after stent implantation, and to study geometrical and hemodynamical changes. Methods: Two image modalities have been employed to generate the bifurcation models: computer tomography angiography (CTA) to obtain the 3D trajectory of vessels, and 2D conventional coronary angiography (CCA) to obtain radius information of the vessel lumen, due to its better contrast and image resolution. In addition, CCA can be acquired right before and after the intervention in the operation room; therefore, the combination of CTA and CCA allows the generation of realistic preprocedure and postprocedure models of coronary bifurcations. The method proposed is semiautomatic, based on landmarks manually placed on both image modalities. Results: A comparative study of the models obtained with the proposed method with models manually obtained using only CTA, shows more reliable results when both modalities are used together. The authors show that using preprocedure CTA and postprocedure CCA, realistic postprocedure models can be obtained. Analysis carried out of the Murray's law in all patient bifurcations shows the geometric improvement of PCI in our models, better than using manual models from CTA alone. An experiment using a cardiac phantom also shows the feasibility of the proposed method. Conclusions: The authors have shown that fusion of CTA and CCA is feasible for realistic generation of coronary bifurcation models before and after PCI. The method proposed is efficient, and relies on minimal user interaction, and therefore is of high value to study geometric and hemodynamic changes of treated patients.

Cardenes, Ruben; Diez, Jose L.; Duchateau, Nicolas; Pashaei, Ali; Frangi, Alejandro F. [Center for Computational Imaging and Simulation Technologies in Biomedicine (CISTIB)-Universitat Pompeu Fabra and Networking Biomedical Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona 08018 (Spain); Cardiology Department, University Hospital Dr. Peset, Valencia 46017 (Spain); Hospital Clinic Provincial de Barcelona, Institut d'investigacions Biomediques August Pi i Sunyer-Universitat de Barcelona, Barcelona 08036 (Spain); Center for Computational Imaging and Simulation Technologies in Biomedicine (CISTIB)-Universitat Pompeu Fabra and Networking Biomedical Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona 08018 (Spain); Center for Computational Imaging and Simulation Technologies in Biomedicine (CISTIB)-Universitat Pompeu Fabra and Networking Biomedical Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona 08018, Spain and Department of Mechanical Engineering, University of Sheffield, Sheffield S1 3JD (United Kingdom)

2013-01-15T23:59:59.000Z

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


201

A model for estimation of potential generation of waste electrical and electronic equipment in Brazil  

SciTech Connect (OSTI)

Highlights: Black-Right-Pointing-Pointer Literature of WEEE generation in developing countries is reviewed. Black-Right-Pointing-Pointer We analyse existing estimates of WEEE generation for Brazil. Black-Right-Pointing-Pointer We present a model for WEEE generation estimate. Black-Right-Pointing-Pointer WEEE generation of 3.77 kg/capita year for 2008 is estimated. Black-Right-Pointing-Pointer Use of constant lifetime should be avoided for non-mature market products. - Abstract: Sales of electrical and electronic equipment are increasing dramatically in developing countries. Usually, there are no reliable data about quantities of the waste generated. A new law for solid waste management was enacted in Brazil in 2010, and the infrastructure to treat this waste must be planned, considering the volumes of the different types of electrical and electronic equipment generated. This paper reviews the literature regarding estimation of waste electrical and electronic equipment (WEEE), focusing on developing countries, particularly in Latin America. It briefly describes the current WEEE system in Brazil and presents an updated estimate of generation of WEEE. Considering the limited available data in Brazil, a model for WEEE generation estimation is proposed in which different methods are used for mature and non-mature market products. The results showed that the most important variable is the equipment lifetime, which requires a thorough understanding of consumer behavior to estimate. Since Brazil is a rapidly expanding market, the 'boom' in waste generation is still to come. In the near future, better data will provide more reliable estimation of waste generation and a clearer interpretation of the lifetime variable throughout the years.

Araujo, Marcelo Guimaraes, E-mail: marcel_g@uol.com.br [Federal University of Rio de Janeiro, COPPE, Energy Planning Department (Brazil); Magrini, Alessandra [Federal University of Rio de Janeiro, COPPE, Energy Planning Department (Brazil); Mahler, Claudio Fernando [Federal University of Rio de Janeiro, COPPE, GETRES (Brazil); Bilitewski, Bernd [Technical University of Dresden, Institute of Waste Management and Contaminated Site Treatment (IAA) (Germany)

2012-02-15T23:59:59.000Z

202

Use of Frequency Response Metrics to Assess the Planning and Operating Requirements for Reliable Integration of Variable Renewable Generation  

E-Print Network [OSTI]

and energy storage. Use of Frequency Response Metrics toand energy storage. xxix Use of Frequency Response Metricsfrequency control such as demand response and energy storage.

Eto, Joseph H.

2011-01-01T23:59:59.000Z

203

CP violation in the two-generation version of left-right models  

Science Journals Connector (OSTI)

Recent measurements of ?’/??3×10-3 and Dn, the neutron electric dipole moment, of the order 10-25 e cm if confirmed may be used to place useful constraints on different CP-violation models. In this paper, we study their implications on a class of two-generation versions of minimal left-right models. We find that, if all these observations are to be explained by these models, the CP-violation phases of the model must fall into an interesting fine-tuned hierarchical pattern. A realization of such a pattern is illustrated in a minimal spontaneous CP-violation model.

Jiang Liu; C. Q. Geng; John N. Ng

1989-06-01T23:59:59.000Z

204

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

205

RADIATION CARCINOGENESIS IN MAN: INFLUENCE OF DOSE-RESPONSE MODELS AND RISK PROJECTION MODELS IN THE ESTIMATION OF RISK COEFFICIENTS FOLLOWING EXPOSURE TO LOW-LEVEL RADIATION  

E-Print Network [OSTI]

RADIATION CARCINOGENESIS IN MAN: INFLUENCE OF DOSE-RESPONSE MODELS AND RISK PROJECTION MODELS IN THE ESTIMATIONRADIATION CARCINOGENESIS IN HAN: INFLUENCE OF DOSE-RESPONSE MODELS AND RISK PROJECTION MODELS IN THE ESTIMATION

Fabrikant, J.I.

2010-01-01T23:59:59.000Z

206

Generating 24-Hour ECG, BP and Respiratory Signals with Realistic Linear and Nonlinear Clinical Characteristics Using a Nonlinear Model  

E-Print Network [OSTI]

Generating 24-Hour ECG, BP and Respiratory Signals with Realistic Linear and Nonlinear Clinical, London School of Economics, London, UK Abstract A nonlinear model for generating lifelike human ECG it to three ordinary differential equations, the model generates a 24-hour ECG signal. Using both standard

McSharry, Patrick E.

207

Resonant Generation of Internal Waves on a Model Continental Slope H. P. Zhang, B. King, and Harry L. Swinney  

E-Print Network [OSTI]

Resonant Generation of Internal Waves on a Model Continental Slope H. P. Zhang, B. King, and Harry wave generation in a laboratory model of oscillating tidal flow on a continental margin. Waves are found to be generated only in a near-critical region where the slope of the bottom topography matches

Texas at Austin. University of

208

Simplified Heat Generation Model for Lithium ion battery used in Electric Vehicle  

Science Journals Connector (OSTI)

It is known that temperature variations inside a battery may greatly affect its performance, life, and reliability. In an effort to gain a better understanding of the heat generation in Lithium ion batteries, a simple heat generation models were constructed in order to predict the thermal behaviour of a battery pack. The Lithium ion battery presents in this paper is Lithium Iron Phosphate (LiFePO4). The results show that the model can be viewed as an acceptable approximation for the variation of the battery pack temperature at a continuous discharge current from data provided by the manufacturer and literature.

Nur Hazima Faezaa Ismail; Siti Fauziah Toha; Nor Aziah Mohd Azubir; Nizam Hanis Md Ishak; Mohd Khair Hassan; Babul Salam Ksm Ibrahim

2013-01-01T23:59:59.000Z

209

A KINETIC MODEL OF SOLAR WIND GENERATION BY OBLIQUE ION-CYCLOTRON WAVES  

SciTech Connect (OSTI)

The fast solar wind is generated by extended perpendicular ion heating in coronal holes, but the kinetic mechanism responsible for this heating has not been determined. One long-standing possibility is the resonant-cyclotron dissipation of ion-cyclotron waves, replenished from a turbulent cascade of interacting counter-propagating Alfven waves. We present results of a kinetic model for proton heating by the quasilinear resonant-cyclotron wave-particle interaction in a coronal hole. The resonant wave spectrum is taken as a power law in wavenumber, uniformly distributed in propagation direction between 0 deg. and 60 deg. with respect to the large-scale radial magnetic field. We obtain the steady-state solution of the kinetic guiding-center equation for the proton distribution in an expanding coronal hole, including the effects of large-scale forces of gravity, charge-separation electric field, Alfven wave ponderomotive force, and mirror force, along with the small-scale scattering from the wave dissipation. We find that plausible wave intensities can yield reasonable flow speeds and temperatures in the heliocentric radial range between 2 and 6 solar radii. We address the claim in earlier work that dissipation of parallel-propagating ion-cyclotron waves cannot provide enough acceleration and show that claim to be incorrect. We find that the combined action of the large-scale forces and the resonant-cyclotron scattering produces proton distribution functions with a characteristic structure: compressed in the sunward half of velocity space with a high-density shell separate from the origin, and relatively expanded in the anti-sunward half of velocity space. We suggest that qualitatively similar proton distributions would result from the kinetic evolution of any sufficiently effective perpendicular heating mechanism operating in an expanding coronal hole.

Isenberg, Philip A.; Vasquez, Bernard J. [Institute for the Study of Earth, Oceans and Space and Department of Physics, University of New Hampshire, Durham, NH 03824 (United States)

2011-04-20T23:59:59.000Z

210

EIA - International Energy Outlook 2009-Appendix J. Models Used To Generate  

Gasoline and Diesel Fuel Update (EIA)

J. Models Used To Generate the IEO2009 Projections J. Models Used To Generate the IEO2009 Projections International Energy Outlook 2009 Appendix J. Models Used To Generate the IEO2009 Projections The IEO2009 projections of world energy consumption and supply were generated from EIAÂ’s World Energy Projections Plus (WEPS+) model. WEPS+ consists of a system of individual sectoral energy models, using an integrated iterative solution process that allows for convergence of consumption and prices to an equilibrium solution. It is used primarily to provide alternative energy projections based on different assumptions for GDP growth and fossil fuel prices and can also be used to perform other analyses. WEPS+ produces projections for 16 regions or countries of the world, including North America (United States, Canada, and Mexico), OECD Europe, OECD Asia (Japan, South Korea, and Australia/New Zealand), Russia, other non-OECD Europe and Eurasia, China, India, other non-OECD Asia, Brazil, and other Central and South America. Currently, the projections extend to 2030.

211

Reduced-Order Modeling of Aggregated Thermostatic Loads With Demand Response  

E-Print Network [OSTI]

Reduced-Order Modeling of Aggregated Thermostatic Loads With Demand Response Wei Zhang, Jianming Lian, Chin-Yao Chang, Karanjit Kalsi and Yannan Sun Abstract-- Demand Response is playing population of appliances under demand response is especially important to evaluate the effec- tiveness

Zhang, Wei

212

Aggregated Modeling and Control of Air Conditioning Loads for Demand Response  

E-Print Network [OSTI]

1 Aggregated Modeling and Control of Air Conditioning Loads for Demand Response Wei Zhang, Member, IEEE Abstract--Demand response is playing an increasingly impor- tant role in the efficient loads is especially important to evaluate the effec- tiveness of various demand response strategies

Zhang, Wei

213

Analyzing the temporal variation of wind turbine responses using Gaussian Mixture Model and Gaussian Discriminant Analysis  

E-Print Network [OSTI]

1 Analyzing the temporal variation of wind turbine responses using Gaussian Mixture Model characteristics have a significant impact on the structural response and the lifespan of wind turbines. This paper presents a machine learning approach towards analyzing and predicting the response of a wind turbine

Stanford University

214

Modeling, Analysis, and Control of Demand Response Resources  

E-Print Network [OSTI]

resources like wind and solar power [100, 19]. The goal ofof DFIG-based wind farms to power system short-termimpacts of wind generation on California power systems”. In:

Mathieu, Johanna L.

2013-01-01T23:59:59.000Z

215

Fuel Cell Tri-Generation System Case Study using the H2A Stationary Model  

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

Fuel Cell Tri-Generation System Case Fuel Cell Tri-Generation System Case Study using the H2A Stationary Model Darlene Steward/ Mike Penev National Renewable Energy Laboratory Integrated Stationary Power and Transportation Workshop Phoenix, Arizona October 27, 2008 National Renewable Energy Laboratory Innovation for Our Energy Future 2 Introduction Goal: Develop a cost analysis tool that will be flexible and comprehensive enough to realistically analyze a wide variety of potential combined heat and power/hydrogen production scenarios Approach: Rely on the H2A discounted cash flow methodology to develop a new stationary systems model With the help of industry partners, develop and analyze a range of realistic case studies for tri-generation systems. National Renewable Energy Laboratory Innovation for Our Energy Future

216

ReEDS Modeling of the President's 2020 U.S. Renewable Electricity Generation Goal (Presentation)  

SciTech Connect (OSTI)

President Obama announced in 2012 an Administration Goal for the United States to double aggregate renewable electricity generation from wind, solar, and geothermal sources by 2020. This analysis, using the Regional Energy Deployment System (ReEDS) model, explores a full range of future renewable deployment scenarios out to 2020 to assess progress and outlook toward this goal. Under all modeled conditions, consisting of 21 scenarios, the Administration Goal is met before 2020, and as early as 2015.

Zinaman, O.; Mai, T.; Lantz, E.; Gelman, R.; Porro, G.

2014-05-01T23:59:59.000Z

217

Modeling social response to the spread of an infectious disease  

E-Print Network [OSTI]

With the globalization of culture and economic trade, it is increasingly important not only to detect outbreaks of infectious disease early, but also to anticipate the social response to the disease. In this thesis, we use ...

Evans, Jane A. (Jane Amanda)

2012-01-01T23:59:59.000Z

218

On the modeling and generation of service-oriented tool chains  

Science Journals Connector (OSTI)

Tool chains have grown from ad-hoc solutions to complex software systems, which often have a service-oriented architecture. With service-oriented tool integration, development tools are made available as services, which can be orchestrated to form tool ... Keywords: Domain specific modeling language, Generative approach, Service-oriented architecture, Tool integration

Matthias Biehl, Jad El-Khoury, Frédéric Loiret, Martin Törngren

2014-05-01T23:59:59.000Z

219

Optimal operation of hydrothermal systems with Hydrological Scenario Generation through Bootstrap and Periodic Autoregressive Models  

Science Journals Connector (OSTI)

In electrical power systems with strong hydro generation, the use of adequate techniques to generate synthetic hydrological scenarios is extremely important for the evaluation of the ways the system behaves in order to meet the forecast energy demand. This paper proposes a new model to generate natural inflow energy scenarios in the long-term operation planning of large-sized hydrothermal systems. This model is based on the Periodic Autoregressive Model, PAR (p), where the identification of the p orders is based on the significance of the Partial Autocorrelation Function (PACF) estimated via Bootstrap, an intensive computational technique. The scenarios generated through this new technique were applied to the operation planning of the Brazilian Electrical System (BES), using the previously developed methodology of Stochastic Dynamic Programming based on Convex Hull algorithm (SDP-CHull). The results show that identification via Bootstrap is considerably more parsimonious, leading to the identification of lower orders models in most cases which retains the statistical characteristics of the original series. Additionally it presents a closer total mean operation cost when compared to the cost obtained via historic series.

Reinaldo Castro Souza; André Lu?´s Marques Marcato; Bruno Henriques Dias; Fernando Luiz Cyrino Oliveira

2012-01-01T23:59:59.000Z

220

Origin-Dependent Inverted-Repeat Amplification: A Replication-Based Model for Generating Palindromic  

E-Print Network [OSTI]

Viewpoints Origin-Dependent Inverted-Repeat Amplification: A Replication-Based Model for Generating in different ways--for example, by end-to- end fusion at short inverted repeats, by non-allelic homologous, the specific class of amplicons that consists of interstitial inverted tripli- cations has no completely

Dunham, Maitreya

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


221

Numerical modeling of extreme rogue waves generated by directional energy focusing  

E-Print Network [OSTI]

Numerical modeling of extreme rogue waves generated by directional energy focusing Christophe angle of directional energy focusing. We find that an over- turning rogue wave can have different are characterized by their brief occurrence in space and time, resulting from a local focusing of wave energy

Grilli, Stéphan T.

222

Seasonal Mean Circulation in the Yellow Sea A ModelGenerated Climatology  

E-Print Network [OSTI]

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

223

Modeling and Generating Daily Changes in Market Variables Using A Multivariate Mixture of Normal Distributions  

E-Print Network [OSTI]

Modeling and Generating Daily Changes in Market Variables Using A Multivariate Mixture of Normal Distributions Jin Wang Department of Mathematics and Computer Science Valdosta State University Valdosta, GA 31698-0040 January 28, 2000 Abstract The mixture of normal distributions provides a useful extension

Wang, Jin

224

THE CALIFORNIAN MODEL AS THE PARADIGM FOR SECOND GENERATION REFORMS IN LATINAMERIC  

E-Print Network [OSTI]

THE CALIFORNIAN MODEL AS THE PARADIGM FOR SECOND GENERATION REFORMS IN LATINAMERIC Hugh Rudnick for a second stage of reform, establishing highly flexible mechanisms of decentralised exchanges, and achieving about the validity of this new paradigm for second stage reforms. They question themselves

Catholic University of Chile (Universidad CatĂłlica de Chile)

225

Model-Based Testing for the Second Generation of Integrated Modular Avionics Christof Efkemann, Jan Peleska  

E-Print Network [OSTI]

activities regarding automated testing of Integrated Modular Avionics controllers in the European research, specialised electronics devices, many of them with cus- tom interfaces. In the Integrated Modular AvionicsModel-Based Testing for the Second Generation of Integrated Modular Avionics Christof Efkemann, Jan

Peleska, Jan - Fachbereich 3

226

Simulator Generation Using an Automaton Based Pipeline Model for Timing Analysis  

E-Print Network [OSTI]

Simulator Generation Using an Automaton Based Pipeline Model for Timing Analysis Rola Kassem, Mika the description of the pipeline. The description is transformed into an automaton and a set of resources which. The blocks communicate and synchronise with each other in order to handle the pipeline hazards. A pipeline

Paris-Sud XI, Université de

227

Cloud Formation in the Plumes of Solar Chimney Power Generation Facilities: A Modeling Study  

E-Print Network [OSTI]

1 Cloud Formation in the Plumes of Solar Chimney Power Generation Facilities: A Modeling Study Institute of Technology, 311 Ferst Drive, Atlanta , Georgia 30332-0340, USA Abstract The solar chimney power the potential impacts on plant capacity resulting from cloud formation within or downwind of the solar chimney

Nenes, Athanasios

228

A REDUCED GENERATOR MODEL WITH EXCITATION LIMITS Steven Ball Kevin Wedeward Ernest Barany Steve Schaffer  

E-Print Network [OSTI]

through a transmission line. Constant complex load power consumed at bus 2 is denoted by PD+jQD, complex, generator models 1. Introduction The consequences of electric power outages dictate the importance of parameter data, lack tractability for a thorough interpretation of results, and necessitate extensive

Wedeward, Kevin

229

GeM-REM: Generative Model-driven Resource efficient ECG Monitoring in Body Sensor Networks  

E-Print Network [OSTI]

GeM-REM: Generative Model-driven Resource efficient ECG Monitoring in Body Sensor Networks Sidharth electrocardiogram (ECG) monitoring. In such systems, sampling the ECG at clinically recommended rates (250 Hz, there is a need for reducing the energy consumption and data size at the sensor, while maintaining the ECG quality

Poovendran, Radha

230

Nonintrusive 3D reconstruction of human bone models to simulate their bio-mechanical response  

Science Journals Connector (OSTI)

3D finite element models representing functional parts of the human skeletal system, have been repeatedly introduced over the last years, to simulate biomechanical response of anatomical characteristics or investigate surgical treatment. The reconstruction ... Keywords: 3D imaging, Bio-mechanical response, Computed tomography, FEM modeling

Tsouknidas Alexander; Lontos Antonis; Savvakis Savvas; Michailidis Nikolaos

2012-06-01T23:59:59.000Z

231

Final Report for Sea-level Rise Response Modeling for San Francisco Bay Estuary Tidal  

E-Print Network [OSTI]

i Final Report for Sea-level Rise Response Modeling for San Francisco Bay Estuary Tidal Marshes Refuge in northern San Francisco Bay, California. #12;iii Final Report for Sea-level Rise Response)................................................................... 7 Sea-level rise scenario model inputs

Fleskes, Joe

232

Modeling the Atmospheric Boundary Layer Wind Response to Mesoscale Sea Surface Temperature  

E-Print Network [OSTI]

(WRF) and COAMPS atmospheric models. The SST-induced wind response is assessed from eight simulations of the surface wind relative to the SST gradient. #12;3 1. Introduction Positive correlations of local surfaceModeling the Atmospheric Boundary Layer Wind Response to Mesoscale Sea Surface Temperature Natalie

Kurapov, Alexander

233

Exploring the extension of item response theory models to the economic and social measurement  

Science Journals Connector (OSTI)

This paper has a methodological focus and is aimed at exploring the advantages of using the Item Response Theory (IRT) models in the measurement of financial strain. Basically, the IRT models allow deriving a latent measure and a scale from a set of ... Keywords: item response theory, multivariate probit regression, parameters

Raileanu Szeles Monica

2008-07-01T23:59:59.000Z

234

A chemical kinetic model of hydrocarbon generation from the Bakken Formation, Williston Basin, North Dakota  

SciTech Connect (OSTI)

This report describes a model of hydrocarbon generation and expulsion in the North Dakota portion of the Williston Basin. The modeling incorporates kinetic methods to simulate chemical reactions and 1-dimensional conductive heat flow models to simulate thermal histories of the Mississippian-Devonian Bakken Formation source rock. We developed thermal histories of the source rock for 53 wells in the basin using stratigraphic and heat flow data obtained by the University of North Dakota. Chemical kinetics for hydrocarbon generation, determined from Pyromat pyrolysis, were, then used with the diennal histories to calculate the present day value of the Rock-Eval T{sub max} for each well. The calculated Rock-Eval T{sub max} values agreed with measured values within amounts attributable to uncertainties in the chemical kinetics and the heat flow. These optimized thermal histories were then used with a more detailed chemical kinetic model of hydrocarbon generation and expulsion, modified from a model developed for the Cretaceous La Luna shale, to simulate pore pressure development and detailed aspects of the hydrocarbon chemistry. When compared to values estimated from sonic logs, the pore pressure calculation underestimates the role of hydrocarbon generation and overestimates the role of compaction disequilibrium, but it matches well the general areal extent of pore pressures of 0.7 times lithostatic and higher. The simulated chemistry agrees very well with measured values of HI, PI, H/C atomic ratio of the kerogen, and Rock-Eval S1. The model is not as successful in simulating the amount of extracted bitumen and its saturate content, suggesting that detailed hydrous pyrolysis experiments will probably be needed to further refine the chemical model.

Sweeney, J.J.; Braun, R.L.; Burnham, A.K. [Lawrence Livermore National Lab., CA (United States); Gosnold, W.D. [North Dakota Univ., Grand Forks, ND (United States)

1992-10-01T23:59:59.000Z

235

Modelling and simulation of faults in synchronous generators for robust numerical protection  

Science Journals Connector (OSTI)

When an internal fault occurs in a synchronous generator, the symmetry between the parallel paths of the winding is broken and different currents flow in them, due to unsymmetrical magnetic linkage between the stator windings. The aim of this paper is to present a simulation model to investigate the effect of internal fault on the parallel path currents of a large synchronous generator using direct phase quantities. This model is based on a modified winding function approach where the machine inductances are calculated directly from the machine winding distribution using machine electrical parameters instead of the geometrical ones. The simulation results for different cases of internal faults in salient-pole and non-salient-pole synchronous machines have been obtained. Salient-pole synchronous generator has wave winding distribution while the non-salient-pole generator has lap winding arrangement. Due to different stator winding arrangements, the two machines have been simulated individually. By using the simulated fault data, a suitable numerical protection scheme for synchronous generators can be developed.

Amrita Sinha; D.N. Vishwakarma; R.K. Srivastava

2012-01-01T23:59:59.000Z

236

The next generation of shared seismic models for R&D.  

SciTech Connect (OSTI)

We have created several elastic 2-D models and are currently defining a complex 3D elastic salt model for distribution to the international research community for use in the calibration of AVO, polarization filtering, tomography, multicomponent seismic analysis, converted wave tomography, and seismic attribute analysis. We have also obtained the release of several real 2-D data sets corresponding to the 2-D models to test the robustness of any new techniques. In addition to the synthetic seismograms generated over these models, we will release the model definition of layers and rock properties to the research community so that others may modify them to include features beyond the scope of our current effort, such as gas clouds, fractures, and diagenetic changes. Finally, we expect these models to serve as a test bed for impmving the computational efficiency of elastic mode ling as a goal in itself.

Marfurt, K. J.; Wiley, R. (Robert); Martin, G. S. (Gary S.); House, L. S. (Leigh S.); Larsen, S. C. (Shawn C.)

2002-01-01T23:59:59.000Z

237

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

Science Journals Connector (OSTI)

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

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

1991-08-01T23:59:59.000Z

238

A Unit Commitment Model with Demand Response for the Integration of Renewable Energies  

E-Print Network [OSTI]

The output of renewable energy fluctuates significantly depending on weather conditions. We develop a unit commitment model to analyze requirements of the forecast output and its error for renewable energies. Our model obtains the time series for the operational state of thermal power plants that would maximize the profits of an electric power utility by taking into account both the forecast of output its error for renewable energies and the demand response of consumers. We consider a power system consisting of thermal power plants, photovoltaic systems (PV), and wind farms and analyze the effect of the forecast error on the operation cost and reserves. We confirm that the operation cost was increases with the forecast error. The effect of a sudden decrease in wind power is also analyzed. More thermal power plants need to be operated to generate power to absorb this sudden decrease in wind power. The increase in the number of operating thermal power plants within a short period does not affect the total opera...

Ikeda, Yuichi; Kataoka, Kazuto; Ogimoto, Kazuhiko

2011-01-01T23:59:59.000Z

239

Responses of energy use to climate change: A climate modeling study  

SciTech Connect (OSTI)

[1] Using a general-circulation climate model to drive an energy-use model, we projected changes in USA energy-use and in corresponding fossil-fuel CO2 emissions through year 2025 for a low (1.2 XC) and a high (3.4 XC) temperature response to CO2 doubling. The low- T scenario had a cumulative (2003-2025) energy increase of 1.09 quadrillion Btu (quads) for cooling/heating demand. Northeastern states had net energy reductions for cooling/heating over the entire period, but in most other regions energy increases for cooling outweighed energy decreases for heating. The high-?T scenario had significantly increased warming, especially in winter, so decreased heating needs led to a cumulative (2003-2025) heating/cooling energy decrease of 0.82 quads. In both scenarios, CO2 emissions increases from electricity generation outweighed CO2 emissions decreases from reduced heating needs. The results reveal the intricate energy-economy structure that must be considered in projecting consequences of climate warming for energy, economics, and fossil-fuel carbon emissions.

Erickson III, David J [ORNL; Hadley, Stanton W [ORNL; Blasing, T J [ORNL; Hernandez Figueroa, Jose L [ORNL; Broniak, C [Oregon State University

2006-01-01T23:59:59.000Z

240

Modeling of the plasma generated in a rarefied hypersonic shock layer  

SciTech Connect (OSTI)

In this study, a rigorous numerical model is developed to simulate the plasma generated in a rarefied, hypersonic shock layer. The model uses the direct simulation Monte Carlo (DSMC) method to treat the particle collisions and the particle-in-cell (PIC) method to simulate the plasma dynamics in a self-consistent manner. The model is applied to compute the flow along the stagnation streamline in front of a blunt body reentering the Earth's atmosphere at very high velocity. Results from the rigorous DSMC-PIC model are compared directly to the standard DSMC modeling approach that uses the ambipolar diffusion approximation to simulate the plasma dynamics. It is demonstrated that the self-consistent computation of the plasma dynamics using the rigorous DSMC-PIC model captures many physical phenomena not accurately predicted by the standard modeling approach. These computations represent the first assessment of the validity of the ambipolar diffusion approximation when predicting the rarefied plasma generated in a hypersonic shock layer.

Farbar, Erin D.; Boyd, Iain D. [Department of Aerospace Engineering, University of Michigan, Ann Arbor, Michigan 48109-2140 (United States)

2010-10-15T23:59:59.000Z

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


241

Boolean Network Model of Hypoxia Stress Response Pathway  

E-Print Network [OSTI]

Page 2.12 Metabolic switch ................................................................................................... 22 3. P300 AND CYCLIC AMP RESPONSIVE ELEMENT BINDING PROTEIN- BINDING PROTEIN (CBP) TRANSCRIPTIONAL CO... ............................................................................................................. 25 3.2 Histone acetyl transferase ....................................................................................... 26 3.3 P300/CBP as transcriptional coactivators ............................................................... 27 3.4 Hyper...

Varghese, Rajani Rajan

2014-01-14T23:59:59.000Z

242

Evaluation of an emergency response model for the Rocky Flats Plant: Charter  

SciTech Connect (OSTI)

This Charter provides a basis for a cooperative, interagency effort to evaluate the Terrain-Responsive Atmospheric Code for emergency response and emergency planning for the Rocky Flats Plant. This document establishes the foundation for the project entitled, Evaluation of an Emergency Response Model for the Rocky Flats Plant'' (to be referred to as the Project). This document meets the following objectives: Identify the Project; establish the project management structure, organizational responsibilities, and organizational commitments for reaching the goals of the Project, and identify a process for model revision and revelation for acceptance. 2 figs.

Not Available

1991-01-01T23:59:59.000Z

243

Reduced-Order Modeling of Aggregated Thermostatic Loads With Demand Response  

SciTech Connect (OSTI)

Demand Response is playing an increasingly important role in smart grid control strategies. Modeling the behavior of populations of appliances under demand response is especially important to evaluate the effectiveness of these demand response programs. In this paper, an aggregated model is proposed for a class of Thermostatically Controlled Loads (TCLs). The model efficiently includes statistical information of the population, systematically deals with heterogeneity, and accounts for a second-order effect necessary to accurately capture the transient dynamics in the collective response. However, an accurate characterization of the collective dynamics however requires the aggregate model to have a high state space dimension. Most of the existing model reduction techniques require the stability of the underlying system which does not hold for the proposed aggregated model. In this work, a novel model reduction approach is developed for the proposed aggregated model, which can significantly reduce its complexity with small performance loss. The original and the reducedorder aggregated models are validated against simulations of thousands of detailed building models using GridLAB-D, which is a realistic open source distribution simulation software. Index Terms – demand response, aggregated model, ancillary

Zhang, Wei; Lian, Jianming; Chang, Chin-Yao; Kalsi, Karanjit; Sun, Yannan

2012-12-12T23:59:59.000Z

244

Two- and three-dimensional numerical models of internal tide generation at a continental slope  

Science Journals Connector (OSTI)

Some numerical models of internal tide generation at a continental slope are two-dimensional where the along-slope variation is neglected. The energy flux carried by internal tides computed using such two-dimensional models is often underestimated, compared with three-dimensional simulations of the same region, by a factor of 10 or more. The reason for this difference is investigated using both numerical and analytical models. It is shown that in numerical models, it is not the lack of the along-shelf forcing but the use of sponge or radiating conditions at the cross-shelf boundaries that leads to the severe underestimate of the offshore flux. To obtain realistic estimates of energy flux a three-dimensional model with an along-shelf scale of at least 5 internal tide wave lengths at the depth of maximum forcing is necessary.

K. Katsumata

2006-01-01T23:59:59.000Z

245

Model Recovery Procedure for Response to a Radiological Transportation Incident  

Broader source: Energy.gov [DOE]

This Transportation Emergency Preparedness Program (TEPP) Model Recovery Procedure contains the recommended elements for developing and conducting recovery planning at transportation incident scene...

246

Gowdy-symmetric cosmological models with Cauchy horizons ruled by non-closed null generators  

E-Print Network [OSTI]

Smooth Gowdy-symmetric generalized Taub-NUT solutions are a class of inhomogeneous cosmological models with spatial three-sphere topology. They have a past Cauchy horizon with closed null-generators, and they are generally expected to develop a second Cauchy horizon in the future. Here we generalize these models to allow for past Cauchy horizons ruled by non-closed null generators. In particular, we show local and global existence of such a class of solutions with two functional degrees of freedom. This removes a periodicity condition for the asymptotic data at the past Cauchy horizon that was required before. Moreover, we derive a three-parametric family of exact solutions within that class and study some of its properties.

Jörg Hennig

2014-04-15T23:59:59.000Z

247

Study on environmental impact model of grid-connected wind power generation  

Science Journals Connector (OSTI)

As a clean and renewable energy source, wind power is independent from the traditional external energy change, which makes it one of the most promising ways of clean energy generation. It is well known that wind power has obvious energy saving efficiency. But for long-term consideration, wind power generation still has certain impacts on human life. Therefore, standing in the point of the negative effects of wind energy, this paper makes a further research on environmental issues of wind energy development and utilisation. Then combining with fuzzy theory, the environmental impact model of wind energy utilisation is constructed, the science and effectiveness of the model is validated thorough example analysis, which aims to lay a solid theoretical foundation to solve the problems of wind farm grid-connection.

Hao Chang; Jicheng Liu; Cunbin Li

2013-01-01T23:59:59.000Z

248

Model of sludge behavior in nuclear plant steam generators. Final report  

SciTech Connect (OSTI)

The accumulation of large amounts of sludge in pressurized water reactor steam generators is thought to be a cause of accelerated corrosion by trace impurities which concentrate in such deposits. Based on fundamental principles, this study develops a mathematical model for predicting the behavior (e.g., deposition and reentrainment) of sludge in steam generators. The calculated sludge behavior shows good agreement with the limited amount of experimental data available. The results suggest that the continued accumulation of sludge on the tubesheet might be preventable, and that if it could be, the incoming sludge would be removed by blowdown. An analysis of the uncertainties in the model led to suggested priorities for further analytical and experimental work to gain a better understanding of sludge behavior. 29 refs., 12 figs., 15 tabs.

Beal, S.K.; Chen, J.H.

1986-06-01T23:59:59.000Z

249

A HIRARC model for safety and risk evaluation at a hydroelectric power generation plant  

Science Journals Connector (OSTI)

Abstract There are many formal techniques for the systematic analysis of occupational safety and health in general, and risk analysis in particular, for power generation plants at hydroelectric power stations. This study was initiated in order to create a HIRARC model for the evaluation of environmental safety and health at a hydroelectric power generation plant at Cameron Highlands in Pahang, Malaysia. The HIRARC model was used to identify the primary and secondary hazards which may be inherent in the system which were determined as a serious threat for plant operation and maintenance. The primary tools of the model consisted of, generic check-lists, work place inspection schemes which included task observation and interview, safety analysis as well as accident and incident investigation. For risk assessment, the Likert scale was complemented by the severity matrix analysis in order to determine the probability and extent of safety and health at the study power generation plant. These were used to identify and recommend control measures which included engineering and administrative aspects as well as the use of personal protective equipment (PPE). A total of forty-one important hazard items were identified in the system at target power generation plant. These hazards were mainly identified by means of checklists which were sourced from literature and subsequently customized for the current purpose. Risk assessment was conducted by initially classifying the hazards into three levels such as Low, Medium and High. Generally 66% of the hazards identified were at low risk, 32% at medium and 2% at high risk. This indicated that there was sufficient awareness and commitment to safety and health at the study power station. Meanwhile the Power Station was also certified by MS 1722:2005, OHSAS 18001, MS ISO 14001:2004, MS ISO 9001:2000 and scheduled waste regulation 2005 which give credibility to the current study in creating a working model which may find widespread application in the future.

A.M. Saedi; J.J. Thambirajah; Agamuthu Pariatamby

2014-01-01T23:59:59.000Z

250

Dynamic Simulation Studies of the Frequency Response of the Three U.S. Interconnections with Increased Wind Generation  

E-Print Network [OSTI]

wind turbine through a gearbox, and uses a conventional "squirrel cage" induction generator directly connected to the grid.

Mackin, Peter

2011-01-01T23:59:59.000Z

251

The Numerical Modelling Research and Development Division is responsible for research into and develop-  

E-Print Network [OSTI]

into and develop- ment of numerical weather prediction models and other meteorological applications, that are opera in the field of numerical weather prediction: atmospheric and oceanographic modelling, physical and statistical132 The Numerical Modelling Research and Development Division is responsible for research

Haak, Hein

252

A phenomenological model of peripheral and central neural responses to amplitude-modulated tones  

E-Print Network [OSTI]

A phenomenological model of peripheral and central neural responses to amplitude-modulated tones 2004; accepted 30 June 2004 A phenomenological model with time-varying excitation and inhibition of this study are to gain insights on coding strategies. As a result, the model is phenomenological in nature

Carney, Laurel H.

253

A phenomenological model for the responses of auditory-nerve fibers: I. Nonlinear tuning  

E-Print Network [OSTI]

A phenomenological model for the responses of auditory-nerve fibers: I. Nonlinear tuning Received 20 June 2000; accepted for publication 8 November 2000 A phenomenological model was developed. The implementation of this model represents a relatively simple phenomenological description of a single mechanism

Carney, Laurel H.

254

An active wave generating–absorbing boundary condition for VOF type numerical model  

Science Journals Connector (OSTI)

The objective of the present work is to discuss the implementation of an active wave generating–absorbing boundary condition for a numerical model based on the Volume Of Fluid (VOF) method for tracking free surfaces. First an overview of the development of VOF type models with special emphasis in the field of coastal engineering is given. A new type of numerical boundary condition for combined wave generation and absorption in the numerical model \\{VOFbreak2\\} is presented. The numerical boundary condition is based on an active wave absorption system that was first developed in the context of physical wave flume experiments, using a wave paddle. The method applies to regular and irregular waves. Velocities are measured at one location inside the computational domain. The reflected wave train is separated from the incident wave field in front of a structure by means of digital filtering and subsequent superposition of the measured velocity signals. The incident wave signal is corrected, so that the reflected wave is effectively absorbed at the boundary. The digital filters are derived theoretically and their practical design is discussed. The practical use of this numerical boundary condition is compared to the use of the absorption system in a physical wave flume. The effectiveness of the active wave generating–absorbing boundary condition finally is proved using analytical tests and numerical simulations with VOFbreak2.

Peter Troch; Julien De Rouck

1999-01-01T23:59:59.000Z

255

Abstract--Piezoelectricity is an ability of some materials to generate an electric potential in response to applied mechanical  

E-Print Network [OSTI]

Abstract--Piezoelectricity is an ability of some materials to generate an electric potential, PZT ceramics I. INTRODUCTION Piezoelectricity is an ability to generate an electric potential that demonstrate the direct piezoelectric effect, which is the generation of electricity upon applied mechanical

Ha, Dong S.

256

Modeling the cytotoxic T cell response Dennis Lai Chao  

E-Print Network [OSTI]

a graduate fellowship from the National Science Foundation via the BIO Research Training Group in Ecological, achieving this level of control is impossible. Model-building can also be used as a vehicle for hypothesis

Forrest, Stephanie

257

Assessing the potential of residential demand response systems to assist in the integration of local renewable energy generation  

Science Journals Connector (OSTI)

Mass market demand response programmes may be utilised to assist bulk ... and software architecture in households. In contrast, demand response systems based only on information exchange between ... uptake. The e...

A. D. Peacock; E. H. Owens

2014-06-01T23:59:59.000Z

258

Modeling of gas generation from the Cameo coal zone in the Piceance Basin Colorado  

SciTech Connect (OSTI)

The gas generative potential of the Cretaceous Cameo coal in the Piceance Basin, northwestern Colorado, was evaluated quantitatively by sealed gold tube pyrolysis. The H/C and O/C elemental ratios show that pyrolyzed Cameo coal samples follow the Van Krevelen humic coal evolution pathway, reasonably simulating natural coal maturation. Kinetic parameters (activation energy and frequency factor) for gas generation and vitrinite reflectance (R{sub o}) changes were calculated from pyrolysis data. Experimental R{sub o} results from this study are not adequately predicted by published R{sub o} kinetics and indicate the necessity of deriving basin-specific kinetic parameters when building predictive basin models. Using derived kinetics for R{sub o}, evolution and gas generation, basin modeling was completed for 57 wells across the Piceance Basin, which enabled the mapping of coal-rank and coalbed gas potential. Quantities of methane generated at approximately 1.2% R{sub o} are about 300 standard cubic feet per ton (scf/ton) and more than 2500 scf/ton (in-situ dry-ash-free coal) at R{sub o}, values reaching 1.9%. Gases generated in both low- and high-maturity coals are less wet, whereas the wetter gas is expected where R{sub o} is approximately 1.4-1.5%. As controlled by regional coal rank and net coal thickness, the largest in-place coalbed gas resources are located in the central part of the basin, where predicted volumes exceed 150 bcf/mi, excluding gases in tight sands.

Zhang, E.; Hill, R.J.; Katz, B.J.; Tang, Y.C. [Shell Exploration and Production Co., BTC, Houston, TX (United States)

2008-08-15T23:59:59.000Z

259

Ac-conductivity and electromagnetic energy absorption for the Anderson model in linear response theory  

E-Print Network [OSTI]

We continue our study of the ac-conductivity in linear response theory for the Anderson model using the conductivity measure. We establish further properties of the conductivity measure, including nontriviality at nonzero temperature, the high temperature limit, and asymptotics with respect to the disorder. We also calculate the electromagnetic energy absorption in linear response theory in terms of the conductivity measure.

Abel Klein; Peter Müller

2014-03-03T23:59:59.000Z

260

Hydrologic modeling using triangulated irregular networks : terrain representation, flood forecasting and catchment response  

E-Print Network [OSTI]

Numerical models are modern tools for capturing the spatial and temporal variability in the land-surface hydrologic response to rainfall and understanding the physical relations between internal watershed processes and ...

Vivoni, Enrique R. (Enrique Rafael), 1975-

2003-01-01T23:59:59.000Z

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


261

Smart finite state devices: A modeling framework for demand response technologies  

E-Print Network [OSTI]

We introduce and analyze Markov Decision Process (MDP) machines to model individual devices which are expected to participate in future demand-response markets on distribution grids. We differentiate devices into the ...

Turitsyn, Konstantin

262

Modeling the Atmospheric Boundary Layer Wind Response to Mesoscale Sea Surface Temperature Perturbations  

Science Journals Connector (OSTI)

The wind speed response to mesoscale SST variability is investigated over the Agulhas Return Current region of the Southern Ocean using the Weather Research and Forecasting (WRF) Model and the U.S. Navy Coupled Ocean–Atmosphere Mesoscale ...

Natalie Perlin; Simon P. de Szoeke; Dudley B. Chelton; Roger M. Samelson; Eric D. Skyllingstad; Larry W. O’Neill

2014-11-01T23:59:59.000Z

263

Threshold estimation from the linear dose-response model: Method and radiation data  

Science Journals Connector (OSTI)

The linear dose-response model is considered a conservative, nonthreshold relationship. This is based on a confusion between the sufficient condition (that is, zero slope at zero dose) and the necessary condit...

David J. Schaeffer; Konanur G. Janardan; Harold W. Kerster

1981-01-01T23:59:59.000Z

264

Application of Autoregressive Models to In-Service Estimation of Transient Response for LMFBR Process Instrumentation  

SciTech Connect (OSTI)

The response of a sensor depends on its operating conditions, and thus it is desirable to develop an in-service method for response time estimation. The applicability of the autoregressive (AR) model for this purpose was examined in the case of the fuel subassembly outlet coolant thermocouples and the primary circuit electromagnetic flowmeter (EMF) of Monju, the prototype fast breeder reactor in Japan.The use of an AR model with exogenous input (ARX model) is possible when the physical variable to be sensed can be observed by an alternative means with a faster response time than that of the sensor in question. In the case of the subassembly outlet thermocouple, the temperature output from an eddy-current sensor, during pseudorandom reactor power variation, served as the exogenous input.In respect to the thermocouple response, AR and ARX modeling were shown to be applicable, and the transient responses thus derived agreed well with each other and with the results measured by means of a step change in sodium temperature. However, the primary circuit EMF response time, estimated using the AR model, decreased with increasing flow rate even when approaching the rated flow, demonstrating that the method was not completely applicable. Nevertheless, it can be concluded that the response is faster than that estimated in the rated condition.

Ueda, Masashi; Tomobe, Katsuma; Setoguchi, Keiichi; Endou, Akira [Japan Nuclear Cycle Development Institute (Japan)

2002-02-15T23:59:59.000Z

265

Seismic structural response from continuous and discrete models  

E-Print Network [OSTI]

. Derivation . 2. Solving the Shear Beam Differential Equation 3. Adding Damping to the Shear Beam Model D. Comparisons of Results from the Models E. Simple Dynamic Tests of the Models 1. Acceleration Pulse 2. Velocity Pulse . 3. Instantaneous Pulse... + asst) + C(tt t tt 4 + a4vt + t23ttt) Solve Kttt+ttt = p, for Btt t3t / t+rtt ~ u0(ut+t3t ut) tt2vt tt3ttt Vt+at + Vt + ttsttt ? tt&ttt+ttt outPut ttt+ttt vt+ttt t3t+t3t t 4 ? t+Dt ut 4 ut+za vt 4 ? vt4-d, t ttt 4 ttt+za enddo...

Roberts, Matthew Wade

2012-06-07T23:59:59.000Z

266

Modeling the elastic and plastic response of single crystals and polycrystalline aggregates  

E-Print Network [OSTI]

MODELING THE ELASTIC AND PLASTIC RESPONSE OF SINGLE CRYSTALS AND POLYCRYSTALLINE AGGREGATES A Thesis by PARAG VILAS PATWARDHAN Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE December 2003 Major Subject: Mechanical Engineering MODELING THE ELASTIC AND PLASTIC RESPONSE OF SINGLE CRYSTALS AND POLYCRYSTALLINE AGGREGATES A Thesis by PARAG VILAS...

Patwardhan, Parag Vilas

2005-02-17T23:59:59.000Z

267

Pupil-retina interaction: An analog eye response model.  

E-Print Network [OSTI]

, the ~Pu il Diameter, and the Relative Concentratfon o'I ~Rhode s Figure 168. ~Gra hs of the Relative Concentrations of M~etarhod si I. M~etarh do sin II, and ~Para hodo sin Figure 16C. ~Gra h of the Relative Concentration of ~gto in gso Rett ~ n 64... track ' ' ' ' ' ' ' . These models represented either 3, 5, 6, 8, 9, 11, 12, 13 informational processing within the brain or mechanisms of the eye. However, most of these models failed to consider the pupil- servomechanism which controls...

Spencer, John Rolland

1972-01-01T23:59:59.000Z

268

Bayesian System Identification and Response Predictions Robust to Modeling Uncertainty  

E-Print Network [OSTI]

uncertainties, both prior (e.g. design based on reliability or life-cycle cost optimization), & posterior (e reliability of treating excitation uncertainty under wind and earthquakes (random vibrations, stochastic in the development and use of Bayesian methods in the last decade or so · Allows analysis that is robust to modeling

Beck, James L.

269

Tool support for generating model-based test cases via web  

Science Journals Connector (OSTI)

Testing activities play an important role in order to obtain high quality software products. These activities become more important when considering critical software, for instance, space application software. Nowadays, there is an extensive collaboration among space institutions. So, it is more than natural to expect distributed development of software and software testing activities. Therefore, a collaborative tool hosted on the internet becomes quite useful. In this respect, WEB-PerformCharts 2.0 tool discussed in this paper moves in this direction. The tool focuses on supporting a single aspect of distributed software development: the activity of generating test cases via web. Moreover, it allows model-based test case generation by means of formal methods (formal languages statecharts and FSM) which are considered state of the art in software development. WEB-PerformCharts 2.0 can be used to generate test cases for any kind of reactive systems modelled in statecharts or FSM. We present three case studies in different application domains to demonstrate the feasibility of our tool.

Alessandro Oliveira Arantes; Valdivino Alexandre De Santiago JĂşnior; Nandamudi Lankalapalli Vijaykumar; Erica Ferreira De Souza

2014-01-01T23:59:59.000Z

270

A novel KICA–PCA fault detection model for condition process of hydroelectric generating unit  

Science Journals Connector (OSTI)

Abstract Fault detection and diagnosis of hydroelectric generating unit (HGU) have significant importance to the security of hydropower plant and the power system. In recent years, many fault detection methods based on spectral characteristic of vibration signals have been published. However, some faults cannot be effectively recognized just with spectral features for condition process monitoring of HGU. Thus, this study presents a novel fault detection model based on kernel independent component analysis and principal component analysis (KICA–PCA) monitoring model for condition process of HGU. Each of the condition processes is equivalent to a multivariate statistical process monitoring (MSPM). KICA–PCA model of the specific MSPM is trained by normal condition process data at first. Then, confidence limits of two monitoring indices (Hotelling’s T2 statistic and SPE statistic) of the trained KICA–PCA model are used to monitor the same condition process and detect fault online. Moreover, the proposed monitoring model is applied to a real condition process of HGU. Compared to ICA–PCA and PCA monitoring model, the proposed model has superior performance in fault detection.

Wenlong Zhu; Jianzhong Zhou; Xin Xia; Chaoshun Li; Jian Xiao; Han Xiao; Xinxin Zhang

2014-01-01T23:59:59.000Z

271

Modelling and testing of the force-generating characteristics of magnetorheological dampers  

Science Journals Connector (OSTI)

This paper presents a model for a magnetorheological damper, and subsequent experimental results. Two cylindrical piston type MR dampers, which develop almost identical friction and viscous forces, were tested. These dampers were designed to provide different combinations of fluid flow and magnetic field orientation. In one damper, the magnetic field and magnetic field orientation are designed to be primarily parallel to each other, and in the other damper, the field and flow are designed to be perpendicular. Each actuator was tested under different conditions of applied current and piston speed, and the force-generating characteristics were studied. The two damper designs will be introduced and a comparison between results from the model and the experiments will be made. In general, the model captures the forcegenerating characteristics of the dampers; however, it does not account for field-flow orientations.

Muturi G. Muriuki; William W. Clark

2003-01-01T23:59:59.000Z

272

Constitutive modeling of the visco-plastic response of Hastelloy-X and aluminum alloy 8009  

SciTech Connect (OSTI)

The viscoplastic behavior of advanced, high temperature, metallic alloys is characterized using the Bodner Partom unified constitutive model. Material parameters for both Hastelloy-X and Aluminum alloy 8009 are obtained for this model. The Bodner-Partom constitutive model is summarized, and a detailed approach for determining the model parameters from experimental data is reviewed. Experimental methods for obtaining the mechanical test data are described. Bodner-Partom model parameters are determined from data obtained in uniaxial, isothermal, monotonic tension or compression tests and isothermal creep tests. Model predictions from the parameters determined are generated and compared to experimental data.

Rowley, M.A.; Thornton, E.A. [Univ. of Virginia, Charlottesville, VA (United States). Dept. of Mechanical and Aerospace Engineering

1996-01-01T23:59:59.000Z

273

Paradigm shift in urban energy systems through distributed generation: Methods and models  

Science Journals Connector (OSTI)

The path towards energy sustainability is commonly referred to the incremental adoption of available technologies, practices and policies that may help to decrease the environmental impact of energy sector, while providing an adequate standard of energy services. The evaluation of trade-offs among technologies, practices and policies for the mitigation of environmental problems related to energy resources depletion requires a deep knowledge of the local and global effects of the proposed solutions. While attempting to calculate such effects for a large complex system like a city, an advanced multidisciplinary approach is needed to overcome difficulties in modeling correctly real phenomena while maintaining computational transparency, reliability, interoperability and efficiency across different levels of analysis. Further, a methodology that rationally integrates different computational models and techniques is necessary to enable collaborative research in the field of optimization of energy efficiency strategies and integration of renewable energy systems in urban areas. For these reasons, a selection of currently available models for distributed generation planning and design is presented and analyzed in the perspective of gathering their capabilities in an optimization framework to support a paradigm shift in urban energy systems. This framework embodies the main concepts of a local energy management system and adopts a multicriteria perspective to determine optimal solutions for providing energy services through distributed generation.

Massimiliano Manfren; Paola Caputo; Gaia Costa

2011-01-01T23:59:59.000Z

274

Estimating the Contribution of Sea Ice Response to Climate Sensitivity in a Climate Model  

Science Journals Connector (OSTI)

The response of sea ice to climate change affects Earth’s radiative properties in ways that contribute to yet more climate change. Here, a configuration of the Community Earth System Model, version 1.0.4 (CESM 1.0.4), with a slab ocean model and a ...

Ken Caldeira; Ivana Cvijanovic

2014-11-01T23:59:59.000Z

275

Modeling of quasistatic and dynamic load responses of filled viscoelastic materials  

E-Print Network [OSTI]

are typically used for static finite element analysis (see [9]). The CRSC/Lord team worked, both theoreticallyModeling of quasi­static and dynamic load responses of filled viscoelastic materials H.T. Banks factors to the complications arising in the process of formulating models. Damping is highly complex

276

Efficient Estimation in a Regression Model with Missing Responses  

E-Print Network [OSTI]

function for the linear regression model where r#(X) = #>X is b( i; Xi; i) = E h fX E(Xj = 1)gl( ) + E(Xj = 1) 2 i n [X E(Xj = 1)]l( ) + E(Xj = 1) 2 o> 1 i n [Xi E(Xj = 1)]l( i) + E(Xj = 1) i 2 o : Proof: Assuming r#(X...) = #>X then _r#(X) = X, and Equation 2.2 becomes ( i; Xi; i) = fX E[Xj = 1]g l( i) + E[Xj = 1] i 2 : The e cient in uence function from Equation 2.3 is b( i; Xi; i) = E n [X E(Xj = 1)]l( ) + E(Xj = 1) 2 o n [X E(Xj = 1)]l( ) + E...

Crawford, Scott

2012-10-19T23:59:59.000Z

277

Erosion-corrosion modelling of gas turbine materials for coal-fired combined cycle power generation  

Science Journals Connector (OSTI)

The development of coal-fired combined cycle power generation systems is receiving considerable worldwide interest. The successful development and commercialisation of these new systems require that all the component parts are manufactured from appropriate materials and that these materials give predictable in-service performance. Corrosion and erosion-corrosion, resulting from coal derived particulates, deposition and gaseous species, have been identified as potential life limiting factors for these systems. Models to predict these modes of materials degradation are under active development. This paper outlines the development and testing of models suitable for use in gas turbine environments. The complexity of the corrosion processes means that an empirical approach to model development is required whereas a more mechanistic approach can be applied to erosion processes. For hot corrosion conditions, statistically based corrosion models have been produced using laboratory tests for two coatings and a base alloy at typical type I and type II hot corrosion temperatures (900 and 700°C). These models use the parameters of alkali sulphate deposition flux and \\{SOx\\} partial pressure (at each temperature and for set \\{HCl\\} partial pressures), to predict the rate of the most likely localised damage associated with hot corrosion reactions. For erosion-corrosion modelling, a series of laboratory tests have been carried out to investigate erosion behaviour in corrosive conditions appropriate to coal-fired gas turbines. Materials performance data have been obtained from samples located in the hot gas path of the Grimethorpe PFBC pilot plant, under well characterised conditions, for testing the corrosion and erosion-corrosion models. The models successfully predict the materials damage observed in the pilot plant environments.

N.J. Simms; J.E. Oakey; D.J. Stephenson; P.J. Smith; J.R. Nicholls

1995-01-01T23:59:59.000Z

278

Integrated process modeling for the laser inertial fusion Energy (LIFE) generation system  

SciTech Connect (OSTI)

A concept for a new fusion-fission hybrid technology is being developed at Lawrence Livermore National Laboratory. The primary application of this technology is base-load electrical power generation. However, variants of the baseline technology can be used to 'burn' spent nuclear fuel from light water reactors or to perform selective transmutation of problematic fission products. The use of a fusion driver allows very high burn-up of the fission fuel, limited only by the radiation resistance of the fuel form and system structures. As a part of this process, integrated process models have been developed to aid in concept definition. Several models have been developed. A cost scaling model allows quick assessment of design changes or technology improvements on cost of electricity. System design models are being used to better understand system interactions and to do design trade-off and optimization studies. Here we describe the different systems models and present systems analysis results. Different market entry strategies are discussed along with potential benefits to US energy security and nuclear waste disposal. Advanced technology options are evaluated and potential benefits from additional R&D targeted at the different options is quantified.

Meier, W R; Anklam, T M; Erlandson, A C; Miles, R R; Simon, A J; Sawicki, R; Storm, E

2009-10-22T23:59:59.000Z

279

MONTE CARLO SIMULATION MODEL OF ENERGETIC PROTON TRANSPORT THROUGH SELF-GENERATED ALFVEN WAVES  

SciTech Connect (OSTI)

A new Monte Carlo simulation model for the transport of energetic protons through self-generated Alfven waves is presented. The key point of the model is that, unlike the previous ones, it employs the full form (i.e., includes the dependence on the pitch-angle cosine) of the resonance condition governing the scattering of particles off Alfven waves-the process that approximates the wave-particle interactions in the framework of quasilinear theory. This allows us to model the wave-particle interactions in weak turbulence more adequately, in particular, to implement anisotropic particle scattering instead of isotropic scattering, which the previous Monte Carlo models were based on. The developed model is applied to study the transport of flare-accelerated protons in an open magnetic flux tube. Simulation results for the transport of monoenergetic protons through the spectrum of Alfven waves reveal that the anisotropic scattering leads to spatially more distributed wave growth than isotropic scattering. This result can have important implications for diffusive shock acceleration, e.g., affect the scattering mean free path of the accelerated particles in and the size of the foreshock region.

Afanasiev, A.; Vainio, R., E-mail: alexandr.afanasiev@helsinki.fi [Department of Physics, University of Helsinki (Finland)

2013-08-15T23:59:59.000Z

280

Power System Modeling of 20% Wind-Generated Electricity by 2030: Preprint  

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

Power System Modeling of 20% Power System Modeling of 20% Wind-Generated Electricity by 2030 Preprint M. Hand and N. Blair National Renewable Energy Laboratory M. Bolinger and R. Wiser Lawrence Berkeley National Laboratory R. O'Connell Black & Veatch T. Hern and B. Miller Western Resources Advocates To be presented at the Power Engineering Society 2008 General Meeting Pittsburgh, Pennsylvania July 20-24, 2008 Conference Paper NREL/CP-500-42794 June 2008 NREL is operated by Midwest Research Institute â—Ź Battelle Contract No. DE-AC36-99-GO10337 NOTICE The submitted manuscript has been offered by an employee of the Midwest Research Institute (MRI), a contractor of the US Government under Contract No. DE-AC36-99GO10337. Accordingly, the US Government and MRI retain a nonexclusive royalty-free license to publish or reproduce the published form of

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


281

Modelling a feed-water control system of a steam generator in the framework of the dynamic reliability  

E-Print Network [OSTI]

Modelling a feed-water control system of a steam generator in the framework of the dynamic with the exploration of an industrial complex system behaviour and its prob- abilistic safety assessment (PSA critical systems), the feed-water control system of a steam generator of a pressurised water nuclear

Paris-Sud XI, Université de

282

Analysis and fitting of an SIR model with host response to infection load for a plant disease  

Science Journals Connector (OSTI)

...model fitting to field data and analysis of model...response to the amount (load) of parasite infection...model fitting to field data and analysis of model...response to the amount (load) of parasite infection...plant. Nonlinear loads were introduced to...estimation from the field data Phil. rans. R...

1997-01-01T23:59:59.000Z

283

Modeling the dynamic response of pressures in a distributed helium refrigeration system  

SciTech Connect (OSTI)

A mathematical model is created of the dynamic response of pressures caused by flow inputs to an existing distributed helium refrigeration system. The dynamic system studied consists of the suction and discharge pressure headers and compressor portions of the refrigeration system used to cool the superconducting magnets of the Tevatron accelerator at the Fermi National Accelerator Laboratory. The modeling method involves identifying the system from data recorded during a series of controlled tests, with effort made to detect locational differences in pressure response around the four mile accelerator circumference. A review of the fluid mechanics associated with the system indicates linear time invariant models are suitable for the identification, particularly since the governing equations of one dimensional fluid flow are approximated by linear differential equations. An outline of the experimental design and the data acquisition system are given, followed by a detailed description of the modeling, which utilized the Matlab programming language and associated System Identification Toolbox. Two representations of the system are presented. One, a black box model, provides a multi-input, multi-output description assembled from the results of single input step function testing. This description indicates definite variation in pressure response with distance from the flow input location, and also suggests subtle differences in response with the input location itself. A second system representation is proposed which details the relation between continuous flow changes and pressure response, and provides explanation of a previously unappreciated pressure feedback internal to the system.

Brubaker, J.C.

1997-12-01T23:59:59.000Z

284

Renewable generation and demand response integration in micro-grids: development of a new energy management and control system  

Science Journals Connector (OSTI)

The aim of this research resides in the development of an energy management and control system to control a micro-grid based on the use of renewable generation and demand resources to introduce the application of...

Carlos Álvarez-Bel; Guillermo Escrivá-Escrivá; Manuel Alcázar-Ortega

2013-11-01T23:59:59.000Z

285

Final report for %22High performance computing for advanced national electric power grid modeling and integration of solar generation resources%22, LDRD Project No. 149016.  

SciTech Connect (OSTI)

Design and operation of the electric power grid (EPG) relies heavily on computational models. High-fidelity, full-order models are used to study transient phenomena on only a small part of the network. Reduced-order dynamic and power flow models are used when analysis involving thousands of nodes are required due to the computational demands when simulating large numbers of nodes. The level of complexity of the future EPG will dramatically increase due to large-scale deployment of variable renewable generation, active load and distributed generation resources, adaptive protection and control systems, and price-responsive demand. High-fidelity modeling of this future grid will require significant advances in coupled, multi-scale tools and their use on high performance computing (HPC) platforms. This LDRD report demonstrates SNL's capability to apply HPC resources to these 3 tasks: (1) High-fidelity, large-scale modeling of power system dynamics; (2) Statistical assessment of grid security via Monte-Carlo simulations of cyber attacks; and (3) Development of models to predict variability of solar resources at locations where little or no ground-based measurements are available.

Reno, Matthew J.; Riehm, Andrew Charles; Hoekstra, Robert John; Munoz-Ramirez, Karina; Stamp, Jason Edwin; Phillips, Laurence R.; Adams, Brian M.; Russo, Thomas V.; Oldfield, Ron A.; McLendon, William Clarence, III; Nelson, Jeffrey Scott; Hansen, Clifford W.; Richardson, Bryan T.; Stein, Joshua S.; Schoenwald, David Alan; Wolfenbarger, Paul R.

2011-02-01T23:59:59.000Z

286

Development and Validation of Aggregated Models for Thermostatic Controlled Loads with Demand Response  

SciTech Connect (OSTI)

Demand response is playing an increasingly important role in smart grid research and technologies being examined in recently undertaken demonstration projects. The behavior of load as it is affected by various load control strategies is important to understanding the degree to which different classes of end-use load can contribute to demand response programs at various times. This paper focuses on developing aggregated control models for a population of thermostatically controlled loads. The effects of demand response on the load population dynamics are investigated.

Kalsi, Karanjit; Elizondo, Marcelo A.; Fuller, Jason C.; Lu, Shuai; Chassin, David P.

2012-01-04T23:59:59.000Z

287

Mesh generation and mesh adaptation for large-scale Earth-system modelling  

Science Journals Connector (OSTI)

...coexist with a grid generation approach for complex...bathymetry). Mesh generation is a computational fluid...aircraft or inside a nuclear reactor. In-the large-scale...environmental community, mesh generation research has been largely...

2009-01-01T23:59:59.000Z

288

Model-Based Control: Development of a software tool for responsive building  

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

Model-Based Control: Development of a software tool for responsive building Model-Based Control: Development of a software tool for responsive building research, design and operation Speaker(s): Brian Coffey Date: June 28, 2006 - 12:00pm Location: 90-4133 Seminar Host/Point of Contact: Peng Xu Model-based control approaches the problem of optimal supervisory control for complex building systems by using discrete timesteps and searching for an optimal control configuration at each timestep, using a detailed building model and an optimization algorithm. Although the approach itself is not new (it was proposed at least as early as 1988), it is only during the past five to ten years that readily-available computation power has allowed researchers to consider this approach with complex system models. Recent research has developed and tested this approach for active solar

289

Response Surface Energy Modeling of an Electric Vehicle over a Reduced Composite Drive Cycle  

SciTech Connect (OSTI)

Response surface methodology (RSM) techniques were applied to develop a predictive model of electric vehicle (EV) energy consumption over the Environmental Protection Agency's (EPA) standardized drive cycles. The model is based on measurements from a synthetic composite drive cycle. The synthetic drive cycle is a minimized statistical composite of the standardized urban (UDDS), highway (HWFET), and US06 cycles. The composite synthetic drive cycle is 20 minutes in length thereby reducing testing time of the three standard EPA cycles by over 55%. Vehicle speed and acceleration were used as model inputs for a third order least squared regression model predicting vehicle battery power output as a function of the drive cycle. The approach reduced three cycles and 46 minutes of drive time to a single test of 20 minutes. Application of response surface modeling to the synthetic drive cycle is shown to predict energy consumption of the three EPA cycles within 2.6% of the actual measured values. Additionally, the response model may be used to predict energy consumption of any cycle within the speed/acceleration envelope of the synthetic cycle. This technique results in reducing test time, which additionally provides a model that may be used to expand the analysis and understanding of the vehicle under consideration.

Jehlik, Forrest [Argonne National Laboratory (ANL)] [Argonne National Laboratory (ANL); LaClair, Tim J [ORNL] [ORNL

2014-01-01T23:59:59.000Z

290

Methane for Power Generation in Muaro Jambi: A Green Prosperity Model Project  

SciTech Connect (OSTI)

NREL conducted eight model projects for Millennium Challenge Corporation's (MCC) Compact with Indonesia. Green Prosperity, the largest project of the Compact, seeks to address critical constraints to economic growth while supporting the Government of Indonesia's commitment to a more sustainable, less carbon-intensive future. This study evaluates electricity generation from the organic content of wastewater at a palm oil mill in Muaro Jambi, Sumatra. Palm mills use vast amounts of water in the production process resulting in problematic waste water called palm oil mill effluent (POME). The POME releases methane to the atmosphere in open ponds which could be covered to capture the methane to produce renewable electricity for rural villages. The study uses average Indonesia data to determine the economic viability of methane capture at a palm oil mill and also evaluates technology as well as social and environmental impacts of the project.

Moriarty, K.; Elchinger, M.; Hill, G.; Katz, J.; Barnett, J.

2014-07-01T23:59:59.000Z

291

Model predictive control system and method for integrated gasification combined cycle power generation  

SciTech Connect (OSTI)

Control system and method for controlling an integrated gasification combined cycle (IGCC) plant are provided. The system may include a controller coupled to a dynamic model of the plant to process a prediction of plant performance and determine a control strategy for the IGCC plant over a time horizon subject to plant constraints. The control strategy may include control functionality to meet a tracking objective and control functionality to meet an optimization objective. The control strategy may be configured to prioritize the tracking objective over the optimization objective based on a coordinate transformation, such as an orthogonal or quasi-orthogonal projection. A plurality of plant control knobs may be set in accordance with the control strategy to generate a sequence of coordinated multivariable control inputs to meet the tracking objective and the optimization objective subject to the prioritization resulting from the coordinate transformation.

Kumar, Aditya; Shi, Ruijie; Kumar, Rajeeva; Dokucu, Mustafa

2013-04-09T23:59:59.000Z

292

A phenomenological model for the responses of auditory-nerve fibers. II. Nonlinear tuning with a frequency glide  

E-Print Network [OSTI]

A phenomenological model for the responses of auditory-nerve fibers. II. Nonlinear tuning and the level-dependent compressive nonlinearity into a phenomenological model for the AN was the primary focus nonlinear phenomenological model for the response patterns of AN fibers to different sound inputs

Carney, Laurel H.

293

Assessing Invariance of Factor Structures and Polytomous Item Response Model Parameter Estimates  

E-Print Network [OSTI]

.e., identical items, different people) for the homogenous graded response model (Samejima, 1969) and the partial credit model (Masters, 1982)? To evaluate measurement invariance using IRT methods, the item discrimination and item difficulty parameters... obtained from the GRM need to be equivalent across datasets. The YFCY02 and YFCY03 GRM item discrimination parameters (slope) correlation was 0.828. The YFCY02 and YFCY03 GRM item difficulty parameters (location) correlation was 0...

Reyes, Jennifer McGee

2012-02-14T23:59:59.000Z

294

Discrete Preisach Model for the Superelastic Response of Shape Memory Alloys  

E-Print Network [OSTI]

wires purchased from Images Scienti c Instruments (www.imagesco.com). The gauge length of the wire was 120 mm and transformation temperature around 328 K. The experiments are performed on an Instron 5567 series. C. Model Speci cations It can be seen... of MASTER OF SCIENCE December 2010 Major Subject: Mechanical Engineering DISCRETE PREISACH MODEL FOR THE SUPERELASTIC RESPONSE OF SHAPE MEMORY ALLOYS A Thesis by SRIKRISHNA DORAISWAMY Submitted to the O ce of Graduate Studies of Texas A&M University...

Doraiswamy, Srikrishna

2012-02-14T23:59:59.000Z

295

ACM Reference Format Min, J., Chai, J. 2012. Motion Graphs++: a Compact Generative Model for Semantic Motion Analysis and  

E-Print Network [OSTI]

. Abstract This paper introduces a new generative statistical model that al- lows for human motion analysis statistical models for human motion synthesis and control remains challenging for a number of key reasons (about two hours mocap data and more than 15 differ- ent actions). We have demonstrated the power

Chai, Jinxiang

296

Fractional Dynamical Model for the Generation of ECG like Signals from Filtered Coupled Van-der Pol Oscillators  

E-Print Network [OSTI]

In this paper, an incommensurate fractional order (FO) model has been proposed to generate ECG like waveforms. Earlier investigation of ECG like waveform generation is based on two identical Van-der Pol (VdP) family of oscillators which are coupled by time delays and gains. In this paper, we suitably modify the three state equations corresponding to the nonlinear cross-product of states, time delay coupling of the two oscillators and low-pass filtering, using the concept of fractional derivatives. Our results show that a wide variety of ECG like waveforms can be simulated from the proposed generalized models, characterizing heart conditions under different physiological conditions. Such generalization of the modelling of ECG waveforms may be useful to understand the physiological process behind ECG signal generation in normal and abnormal heart conditions. Along with the proposed FO models, an optimization based approach is also presented to estimate the VdP oscillator parameters for representing a realistic ...

Das, Saptarshi

2014-01-01T23:59:59.000Z

297

Price Responsiveness in the AEO2003 NEMS Residential and Commercial Buildings Sector Models  

Reports and Publications (EIA)

This paper describes the demand responses to changes in energy prices in the Annual Energy Outlook 2003 versions of the Residential and Commercial Demand Modules of the National Energy Modeling System (NEMS). It updates a similar paper completed for the Annual Energy Outlook 1999 version of the NEMS.

2003-01-01T23:59:59.000Z

298

Rat injury model under controlled field-relevant primary blast conditions: Acute response to a wide  

E-Print Network [OSTI]

1 1 Rat injury model under controlled field-relevant primary blast conditions: Acute response.edu Keywords: Traumatic Brain Injury, Primary Blast, Mortality, Cellular Membrane Permeability, Lung Injury the risk of sustaining blast induced injury by military personnel and civilians. The blast injury

Farritor, Shane

299

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 4ÂłC for doubled CO2. Enhanced warming is found at higher latitudes near sea-ice margins

300

Modeling Building Thermal Response to HVAC Virginia Smith, Tamim Sookoor, and Kamin Whitehouse  

E-Print Network [OSTI]

Modeling Building Thermal Response to HVAC Zoning Virginia Smith, Tamim Sookoor, and Kamin,sookoor,whitehouse}@virginia.edu Abstract. HVAC systems account for 38% of building energy usage. Studies have indicated at least 5 HVAC systems to enable room-level zoning where each room is conditioned in- dividually based on its

Whitehouse, Kamin

Note: This page contains sample records for the topic "generator response models" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
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We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

SURFACE ELASTICITY MODELS FOR STATIC AND DYNAMIC RESPONSE OF NANOSCALE BEAMS  

E-Print Network [OSTI]

SURFACE ELASTICITY MODELS FOR STATIC AND DYNAMIC RESPONSE OF NANOSCALE BEAMS by Chang Liu B) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) February 2010 © Chang Liu, 2010 #12;ii Abstract Nanoscale beam of nanoscale beams. The objective is to provide NEMS designers with an efficient set of tools that can predict

Phani, A. Srikantha

302

Generation of Small Neutrino Majorana Masses in a Randall-Sundrum Model  

E-Print Network [OSTI]

We propose a model, in the framework of 5D with warped geometry, in which small neutrino Majorana masses are generated by tree level coupling of lepton doublets to a SU(2)_{L}-triplet scalar field, which is coupled to a bulk SM-singlet. The neutrino mass scale is determined by the bulk mass term (alpha_{S}) of the singlet as ve^{-2(alpha_{S}-1)*pi*kR}. This suppression is due to a small overlap between the profile of the singlet zero mode and the triplet, which is confined to the TeV brane. The generic form for the neutrino mass matrix due to the overlap between the fermions is not compatible with the LMA solution. This is overcome by imposing a Z_{4} symmetry, which is softly broken by couplings of the triplet Higgs to the lepton doublets. This model successfully reproduces the observed masses and mixing angles in charged lepton sector as well as in the neutrino sector, in addition to having a prediction of |U_{e3}| ~ O(0.01). The mass of the triplet is of the order of a TeV, and could be produced at upcoming collider experiments. The doubly charged member of the triplet can decay into two same sign charged leptons yielding the whole triplet coupling matrix which, in turn, gives the mixing matrix in the neutrino sector.

Mu-Chun Chen

2005-04-18T23:59:59.000Z

303

User`s guide for PLTWIND Version 1.0: PC-based software for generating plots of monitored wind data and gridded wind fields for Hanford emergency response applications  

SciTech Connect (OSTI)

This document is a user`s guide for the PLoT Near-Surface WIND (PLTWIND) modeling system. PLTWIND is a personal-computer-based software product designed to produce graphical displays of Hanford wind observations and model-generated wind fields. The real-time wind data processed by PLTWIND are acquired from the mainframe computer system at the Hanford Meteorology Station and copied to PLTWIND systems by the Hanford Local Area Network (HLAN). PLTWIND is designed fbr operation on an IBM-compatible PC with a connection to the HLAN. An HP-compatible pen plotter or laser printer (with a minimum of 1.5 megabytes of memory and a Plotter-in-a-Cartridge hardware) is required to generate hardcopies of PLTWTND`s graphical products. PLTWM`s products are intended for use by emergency response personnel in evaluating atmospheric dispersion characteristics in the near-surface environment. Model products provide important atmospheric information to hazard evaluators; however, these products are only tools for assessing near-surface atmospheric transport and should not be interrupted as providing definitive representation of atmospheric conditions.

Glantz, C.S.; Burk, K.W.

1995-09-01T23:59:59.000Z

304

Coordinating Regulation and Demand Response in Electric Power Grids: Direct and Price-Based Tracking Using Multirate Economic Model Predictive Control  

Science Journals Connector (OSTI)

?Based on “Coordinating regulation and demand response in electric power grids using multirate model...

Haitham Hindi; Daniel Greene…

2012-01-01T23:59:59.000Z

305

Response of a laminar premixed flame to flow oscillations: A kinematic model and thermoacoustic instability results  

SciTech Connect (OSTI)

Combustion instability is a resonance phenomenon that arises due to the coupling between the system acoustics and the unsteady heat release. The constructive feedback between the two processes, which is known to occur as a certain phase relationship between the pressure and the unsteady heat release rate is satisfied, depends on many parameters among which is the acoustic mode, the flame holder characteristics, and the dominant burning pattern. In this paper, the authors construct an analytical model to describe the dynamic response of a laminar premixed flame stabilized on the rim of a tube to velocity oscillation. They consider uniform and nonuniform velocity perturbations superimposed on a pipe flow velocity profile. The model results show that the magnitude of heat release perturbation and its phase with respect to the dynamic perturbation dependent primarily on the flame Strohal number, representing the ratio of the dominant frequency times the tube radius to the laminar burning velocity. In terms of this number, high-frequency perturbations pass through the flame while low frequencies lead to a strong response. The phase with respect to the velocity perturbation behaves in the opposite way. Results of this model are shown to agree with experimental observations and to be useful in determining how the combustion excited model is selected among all the acoustic unstable modes. The model is then used to obtain a time-domain differential equation describing the relationship between the velocity perturbation and the heat release response over the entire frequency range.

Fleifil, M.; Annaswamy, A.M.; Ghoneim, A.F. [Massachusetts Inst. of Technology, Cambridge, MA (United States)] [Massachusetts Inst. of Technology, Cambridge, MA (United States); Ghoneim, Z.A. [Ain Shams Univ., Abassia (Egypt)] [Ain Shams Univ., Abassia (Egypt)

1996-09-01T23:59:59.000Z

306

Modelling and design of an eddy current coupling for slip-synchronous permanent magnet wind generators.  

E-Print Network [OSTI]

??ENGLISH ABSTRACT: Slip-synchronous permanent magnet generators (SS-PMG) is a recently proposed direct-grid connected direct-drive generator topology for wind power applications. It combines a permanent magnet… (more)

Mouton, Zac

2013-01-01T23:59:59.000Z

307

Modelling of a Coil Steam Generator for Concentrated Solar Power Applications.  

E-Print Network [OSTI]

??The project investigates a new design for a CSP plant steam generation system, the Coil Steam Generator(CSG). This system allows faster start-ups and therefore higher… (more)

PELAGOTTI, LEONARDO

2014-01-01T23:59:59.000Z

308

Low dose and bystander responses in a 3-D human skin model  

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

and bystander responses in a 3-D human skin model. and bystander responses in a 3-D human skin model. Sally A. Amundson and Alexandre Mezentsev Columbia University Medical Center, Center for Radiological Research, New York, NY 10032 Significant structural abnormalities develop within several days of exposure of the 3-dimensional normal human skin tissue model EPI-200 (MatTek) to high or low doses of low LET radiation. Disruption of the basal layer occurs following high radiation doses, and premature cornification is evident after both high and low dose exposures. In bystander tissue that is near irradiated portions of the tissue, but is not itself irradiated, we also observe premature cornification, increased apoptosis and micronucleus formation. Changes in global gene expression also occur

309

Low dose and bystander responses in a 3-D human skin model  

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

and bystander responses in a 3-D human skin model and bystander responses in a 3-D human skin model Sally A. Amundson Columbia University Medical Center Abstract Significant structural abnormalities develop within several days of exposure of the 3-dimensional normal human skin tissue model EPI-200 (MatTek) to high or low doses of low LET radiation. Disruption of the basal layer occurs following high radiation doses, and premature cornification is evident after both high and low dose exposures. In bystander tissue that is near irradiated portions of the tissue, but is not itself irradiated, we also observe premature cornification, increased apoptosis and micronucleus formation. Changes in global gene expression also occur in both directly irradiated and bystander EPI-200 tissue. Although the unfolding over time

310

Management Responsibilities  

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

Management Responsibilities Management Responsibilities Depleted UF6 Management Responsibilities DOE has responsibility for safe and efficient management of approximately 700,000 metric tons of depleted UF6. Organizational Responsibilities In the United States, the U.S. Department of Energy is responsible for managing all the depleted uranium that has been generated by the government and has been declared surplus to national defense needs. In addition, as a result of two memoranda of agreement that have been signed between the DOE and USEC, the DOE has assumed management responsibility for approximately 145,000 metric tons of depleted UF6 that has been or will be generated by USEC. Any additional depleted UF6 that USEC generates will be USEC's responsibility to manage. DOE Management Responsibility

311

Coastal numerical modelling of tides: Sensitivity to domain size and remotely generated internal tide  

Science Journals Connector (OSTI)

The propagation of remotely generated superinertial internal tides constitutes a difficulty for the modelling of regional ocean tidal variability which we illustrate in several ways. First, the M2 tidal solution inside a control region located along the Southern California Bight coastline is monitored while the extent of the numerical domain is increased (up to 512 × 512  km). While the amplitude and phase of sea level averaged over the region is quasi-insensitive to domain size, a steady increase of kinetic energy, predominantly baroclinic, is observed with increasing domain size. The increasing flux of energy into the control region suggests that this trend is explained by the growing contribution from remote generation sites of internal tide which can propagate up to the control region. Increasing viscosities confirms this interpretation by lowering baroclinic energy levels and limiting their rate of increase with domain size. Doubling the grid spacing allows consideration of numerical domains 2 times larger. While the coarse grid has lower energy levels than the finer grid, the rate of energy increase with domain size appears to be slowing for the largest domain of the coarse grid simulations. Forcing the smallest domain with depth-varying tidal boundary conditions from the simulation in the largest domain produces energy levels inside the control region comparable to those in the control region for the largest domain, thereby confirming the feasibility of a nested approach. In contrast, simulations forced with a subinertial tidal constituent (K1) show that when the propagation of internal tide is limited, the control region kinetic energy is mostly barotropic and the magnitudes of variations of the kinetic energy with domain size are reduced.

Aurelien L. Ponte; Bruce D. Cornuelle

2013-01-01T23:59:59.000Z

312

Modeling, analysis and comparison of TSR and OTC methods for MPPT and power smoothing in permanent magnet synchronous generator-based wind turbines  

Science Journals Connector (OSTI)

Abstract This paper presents a small signal modeling of a direct-driven permanent magnet synchronous generator (PMSG) based on wind turbine which is connected to the grid via back-to-back converters. The proposed small signal model includes two maximum power point tracking (MPPT) controllers: tip speed ratio (TSR) control and optimal torque control (OTC). These methods are analytically compared to illustrate MPPT and power smoothing capability. Then, to compare the MPPT and power smoothing operation of the mentioned methods, simulations are performed in MATLAB/Simulink software. From the simulation results, OTC is highly efficient in power smoothing enhancement and has clearly good performance to extract maximum power from wind; however, TSR control has definitely fast responses to wind speed variations with the expense of higher fluctuations due to its non-minimum phase characteristic.

M. Nasiri; J. Milimonfared; S.H. Fathi

2014-01-01T23:59:59.000Z

313

The 2004 Ultrasonic Benchmark Problem - SDH Response Under Oblique Incidence: Measurements and Patch Element Model Calculations  

SciTech Connect (OSTI)

The 2004 ultrasonic benchmark problem requires models to predict, given a reference pulse waveform, the pulse echo response of cylindrical voids of various radii located in an elastic solid for various incidence angles of a transducer immersed in water. We present the results of calculations based on the patch element model, recently developed at CNDE, to determine the response of an SDH in aluminum for specific oblique incidence angles. Patch element model calculations for a scan across the SDH, involving a range of oblique incidence angles, are also presented. Measured pulse-echo scans involving the SDH response under oblique incidence conditions are reported. In addition, through transmission measurements involving a pinducer as a receiver and an immersion planar probe as a transmitter under oblique incidence conditions are also reported in a defect-free Aluminum block. These pinducer-based measurements on a defect-free block are utilised to characterize the fields at the chosen depth. Comparisons are made between predictions and measurements for the pulse-echo response of a SDH.

Krishnamurthy, C. V.; Shankar, M.; Vardhan, J. Vishnu [Centre for NonDestructive Evaluation, Indian Institute of Technology, Chennai, India 600 036 (India); Balasubramaniam, Krishnan [Department of Mechanical Engineering, Indian Institute of Technology, Chennai, India 600 036 (India)

2006-03-06T23:59:59.000Z

314

High-Generation Polycationic Dendrimers Are Unusually Effective at Disrupting Anionic Vesicles: Membrane Bending Model  

E-Print Network [OSTI]

High-Generation Polycationic Dendrimers Are Unusually Effective at Disrupting Anionic Vesicles June 15, 2000 The membrane disruption properties of high generation (G4 to G7) poly(amidoamine) (PAMAM of reactions (2). The number of surface amine groups doubles with each generation and the dendrimer diameter

Smith, Bradley D.

315

Developing the next-generation climate system models: challenges and achievements  

Science Journals Connector (OSTI)

...need to evolve further into Earth system models. This is also immensely challenging...physical climate models to full Earth system models, through the incorporation...living organisms into climate (Earth) system models. Theoretical bases for modelling...

2009-01-01T23:59:59.000Z

316

The VOLNA code for the numerical modelling of tsunami waves: generation, propagation and inundation  

E-Print Network [OSTI]

A novel tool for tsunami wave modelling is presented. This tool has the potential of being used for operational purposes: indeed, the numerical VOLNA code is able to handle the complete life-cycle of a tsunami (generation, propagation and run-up along the coast). The algorithm works on unstructured triangular meshes and, thus, can be run in arbitrary complex domains. It is often the case since natural coasts tend to be of fractal shape [Sapoval et al, 2004]. This paper contains the detailed description of the finite volume scheme implemented in the code. We explain the numerical treatment of the wet/dry transition. This point is crucial for accurate run-up computation. Most existing tsunami codes use semi-empirical techniques at this stage, which are not always sufficient. The main reason is that people evacuation is decided on the base of inundation maps which are produced with this type of numerical tools. Finally we present several realistic test cases that partially validate our algorithm. Comparisons wit...

Dutykh, Denys; Dias, Frédéric

2010-01-01T23:59:59.000Z

317

Generated using version 3.2 of the official AMS LATEX template The Response of Orographic Precipitation over Idealized1  

E-Print Network [OSTI]

supply.28 About 26% of the world's population lives within mountains or their foothills, and over 40 diagnostic model reveals the primary factors modifying the21 mean orographic precipitation intensity #12;1. Introduction27 Orographic precipitation replenishes a large fraction of the world's fresh water

318

Multiple periodic solutions of an impulsive predator-prey model with Holling-type IV functional response  

Science Journals Connector (OSTI)

An impulsive periodic predator-prey model with Holling-type IV functional response is considered. Using the continuation theorem of coincidence degree theory, we present an easily verifiable sufficient condition on the existence of multiple periodic ... Keywords: Coincidence degree, Holling-type IV functional response, Impulse, Periodic solution, Predator-prey model

Qi Wang; Binxiang Dai; Yuming Chen

2009-05-01T23:59:59.000Z

319

Modeling, Estimation, and Control in Energy Systems: Batteries & Demand Response  

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

Modeling, Modeling, Estimation, and Control in Energy Systems: Batteries & Demand Response Scott Moura Assistant Professor Civl & Environmental Engineering University of California, Berkeley EETD | LBNL Scott Moura | UC Berkeley Control, Batts, DR December 4, 2013 | Slide 1 Source: Vaclav Smil Estimates from Energy Transitions Scott Moura | UC Berkeley Control, Batts, DR December 4, 2013 | Slide 2 Energy Initiatives Denmark 50% wind penetration by 2025 Brazil uses 86% renewables China's aggressive energy/carbon intensity reduction EV Everywhere SunShot Green Button Zero emissions vehicle (ZEV) 33% renewables by 2020 Go Solar California Scott Moura | UC Berkeley Control, Batts, DR December 4, 2013 | Slide 3 Energy Systems of Interest Energy storage Smart Grids (e.g., batteries) (e.g., demand response) Scott Moura | UC Berkeley Control, Batts, DR December 4, 2013 | Slide 4 Energy

320

Study on optimization model of energy collection efficiency and its power generation benefit evaluation of landfill gas  

Science Journals Connector (OSTI)

An optimization model for joint biogas energy collection efficiency that targets the prediction model for landfill gas output dynamics and the optimization model for gas well output has been established. The model was used to comprehensively analyze and evaluate the collection efficiency of a landfill gas well together with the long-term monitoring the gas output of the gas well within Chenjiachong Landfill. The collection efficiency increased by more than 50% than the original collection of landfill biogas and the power generation efficiency increased more than two times after the reservoir area of the landfill was optimized and regulated.

Xue Qiang

2013-01-01T23:59:59.000Z

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


321

Bruce Nuclear Generating Station B rapid cooldown test and validation of simulation model  

SciTech Connect (OSTI)

The SOPHT code was assessed against Bruce Nuclear Generating Station B commissioning data from a heat transport system rapid cooldown. It was found that (a) under a rapid upstream depressurization, the steam relief valves, like orifices, had a lower discharge coefficient than the corresponding steadystate value and (b) the flashing of water in the steam generators during depressurization causes the at-power boiling heat transfer correlations to overpredict the steam generator heat transfer.

Chang, Y.F.; Langan, M.D.; Sermer, P.; Watson, P.C.

1985-09-01T23:59:59.000Z

322

Modeling and Analysis of Photovoltaic Generation and Storage Systems for Residential Use.  

E-Print Network [OSTI]

?? The majority of commercially available electrical energy is generated through the burning of fossil fuels. This process introduces carbon into the atmosphere and thus… (more)

POSEDLY, PAUL EDWARD, III

2008-01-01T23:59:59.000Z

323

Power System Modeling of 20percent Wind-Generated Electricity by 2030  

E-Print Network [OSTI]

GIS-based supply curves for wind resources, along with projected costs and performance for other generation technologies such as pulverized coal

Hand, Maureen

2008-01-01T23:59:59.000Z

324

Power System Modeling of 20percent Wind-Generated Electricity by 2030  

E-Print Network [OSTI]

fuel price forecast Coal prices follow AEO 2007 referencecoal- and natural gas-based electricity generation analyzed here include decreased natural gas prices,

Hand, Maureen

2008-01-01T23:59:59.000Z

325

Power System Modeling of 20percent Wind-Generated Electricity by 2030  

E-Print Network [OSTI]

Contribution to U.S. Electricity Supply. National Renewable20% of the nation's electricity from wind technology byTERMS wind-generated electricity; wind energy; 20% wind

Hand, Maureen

2008-01-01T23:59:59.000Z

326

Asymptotic models for the generation of internal waves by a moving ship, and the dead-water phenomenon  

E-Print Network [OSTI]

Asymptotic models for the generation of internal waves by a moving ship, and the dead occurs when a ship sails in a stratified fluid, and experiences an important drag due to waves below is then provided, in order to predict the behavior of the flow and in which situations the dead-water effect

Boyer, Edmond

327

Multi-Class Video Co-Segmentation with a Generative Multi-Video Model Wei-Chen Chiu Mario Fritz  

E-Print Network [OSTI]

Multi-Class Video Co-Segmentation with a Generative Multi-Video Model Wei-Chen Chiu Mario Fritz Max Planck Institute for Informatics, Saarbr¨ucken, Germany {walon,mfritz}@mpi-inf.mpg.de Abstract Video data in videos and recent advances in video segmentation has shown great progress in exploiting these addition

328

GEOPHYSICAL RESEARCH LETTERS, VOL. ???, XXXX, DOI:10.1029/, A Physical Model for Seismic Noise Generation from Sediment  

E-Print Network [OSTI]

Generation from Sediment Transport in Rivers Victor C. Tsai1,2 , Brent Minchew1,2 , Michael P. Lamb2 , and Jean-Paul Ampuero1,2 Measuring sediment flux in rivers remains a significant problem in studies provide such mea- surements, but the lack of models linking observed seismic quan- tities to sediment flux

Ampuero, Jean Paul

329

Modeling and compensation of cutting-forces generated during the EDM process for ultra high-precision robots  

E-Print Network [OSTI]

Modeling and compensation of cutting-forces generated during the EDM process for ultra high to compen- sate them during the robot usage. We have taken the micro electro-discharge machining process kinematic). Figure 2 Kinematic chain of the robot. The micro-EDM process is used for cutting complex shapes

Floreano, Dario

330

Modelling and Simulation of a Single Phase Grid Connected Using Photovoltaic and Battery Based Power Generation  

Science Journals Connector (OSTI)

Microgrid is a part of the power distribution system which uses renewable energy based of power generation connected to the grid system. Multi energy power generation is composed of renewable energy systems including photovoltaic, wind turbine, energy ... Keywords: Battery Storage, Inverter, Microgrid, Photovoltaic, Matlab/Simulink.

Alias Khamis; Azah Mohamed; Hussain Shareef; Afida Ayob; Mohd Shahrieel Mohd Aras

2013-11-01T23:59:59.000Z

331

GENERATION OF ENSEMBLE STREAMFLOW FORECASTS USING AN ENHANCED VERSION OF THE SNOWMELT RUNOFF MODEL1  

E-Print Network [OSTI]

this article: Manuel Prieto & Carl Bauer (2012): Hydroelectric power generation in Chile: an institutional 2012, 131­146 Hydroelectric power generation in Chile: an institutional critique of the neutrality instructions for authors and subscription information: http://www.tandfonline.com/loi/rwin20 Hydroelectric

Walden, Von P.

332

Multivariate synthetic streamflow generation using a hybrid model based on artificial neural networks Hydrology and Earth System Sciences, 6(4), 641654 (2002) EGS  

E-Print Network [OSTI]

streamflow generation using a hybrid model based on artificial neural networks J.C. Ochoa-Rivera, R. GarcĂ­aMultivariate synthetic streamflow generation using a hybrid model based on artificial neural neural network. The structure of the model results from two components, the neural network (NN

Paris-Sud XI, Université de

333

OASIS4: A Coupling Software for Next Generation Earth System Modelling Ren Redler (1), Sophie Valcke (2) and Hubert Ritzdorf (3)  

E-Print Network [OSTI]

OASIS4: A Coupling Software for Next Generation Earth System Modelling René Redler (1), Sophie system modelling, Geosci. Model. Dev., 3, 87 ­ 104 Link ­ https://oasistrac.cerfacs.fr Financial support ­ R. Redler, S. Valcke and H. Ritzdorf, 2010: OASIS4 ­ a coupling software for next generation earth

334

Optimization of Switched Reluctance Motor for Efficiency Improvement Using Response Surface Model and Kriging Model  

Science Journals Connector (OSTI)

This paper presented an optimization of switched reluctance motor for higher efficiency. The motor in this study was designed based on the magnetic energy conversion loop according to the power requirements of application system. It's found that besides ... Keywords: switched reluctance motor, optimziation, RSM, Kriging Model

Xueguan Song; Youngchul Park; Jian Li; Joonho Lee

2011-04-01T23:59:59.000Z

335

Combined Modeling of Acceleration, Transport, and Hydrodynamic Response in Solar Flares. I. The Numerical Model  

Science Journals Connector (OSTI)

Acceleration and transport of high-energy particles and fluid dynamics of atmospheric plasma are interrelated aspects of solar flares, but for convenience and simplicity they were artificially separated in the past. We present here self-consistently combined Fokker-Planck modeling of particles and hydrodynamic simulation of flare plasma. Energetic electrons are modeled with the Stanford unified code of acceleration, transport, and radiation, while plasma is modeled with the Naval Research Laboratory flux tube code. We calculated the collisional heating rate directly from the particle transport code, which is more accurate than those in previous studies based on approximate analytical solutions. We repeated the simulation of Mariska et al. with an injection of power law, downward-beamed electrons using the new heating rate. For this case, a ~10% difference was found from their old result. We also used a more realistic spectrum of injected electrons provided by the stochastic acceleration model, which has a smooth transition from a quasi-thermal background at low energies to a nonthermal tail at high energies. The inclusion of low-energy electrons results in relatively more heating in the corona (versus chromosphere) and thus a larger downward heat conduction flux. The interplay of electron heating, conduction, and radiative loss leads to stronger chromospheric evaporation than obtained in previous studies, which had a deficit in low-energy electrons due to an arbitrarily assumed low-energy cutoff. The energy and spatial distributions of energetic electrons and bremsstrahlung photons bear signatures of the changing density distribution caused by chromospheric evaporation. In particular, the density jump at the evaporation front gives rise to enhanced emission, which, in principle, can be imaged by X-ray telescopes. This model can be applied to investigate a variety of high-energy processes in solar, space, and astrophysical plasmas.

Wei Liu; Vahé Petrosian; John T. Mariska

2009-01-01T23:59:59.000Z

336

COMBINED MODELING OF ACCELERATION, TRANSPORT, AND HYDRODYNAMIC RESPONSE IN SOLAR FLARES. I. THE NUMERICAL MODEL  

SciTech Connect (OSTI)

Acceleration and transport of high-energy particles and fluid dynamics of atmospheric plasma are interrelated aspects of solar flares, but for convenience and simplicity they were artificially separated in the past. We present here self-consistently combined Fokker-Planck modeling of particles and hydrodynamic simulation of flare plasma. Energetic electrons are modeled with the Stanford unified code of acceleration, transport, and radiation, while plasma is modeled with the Naval Research Laboratory flux tube code. We calculated the collisional heating rate directly from the particle transport code, which is more accurate than those in previous studies based on approximate analytical solutions. We repeated the simulation of Mariska et al. with an injection of power law, downward-beamed electrons using the new heating rate. For this case, a {approx}10% difference was found from their old result. We also used a more realistic spectrum of injected electrons provided by the stochastic acceleration model, which has a smooth transition from a quasi-thermal background at low energies to a nonthermal tail at high energies. The inclusion of low-energy electrons results in relatively more heating in the corona (versus chromosphere) and thus a larger downward heat conduction flux. The interplay of electron heating, conduction, and radiative loss leads to stronger chromospheric evaporation than obtained in previous studies, which had a deficit in low-energy electrons due to an arbitrarily assumed low-energy cutoff. The energy and spatial distributions of energetic electrons and bremsstrahlung photons bear signatures of the changing density distribution caused by chromospheric evaporation. In particular, the density jump at the evaporation front gives rise to enhanced emission, which, in principle, can be imaged by X-ray telescopes. This model can be applied to investigate a variety of high-energy processes in solar, space, and astrophysical plasmas.

Liu Wei [Stanford-Lockheed Institute for Space Research, 466 Via Ortega, Cypress Hall, Stanford, CA 94305-4085 (United States); Petrosian, Vahe [Department of Physics, Stanford University, Stanford, CA 94305-4060 (United States); Mariska, John T. [Naval Research Laboratory, Code 7673, Washington, DC 20375-5000 (United States)

2009-09-10T23:59:59.000Z

337

Nuclear tools for characterising radiological dispersion in complex terrain: evaluation of regulatory and emergency response models  

Science Journals Connector (OSTI)

Routine operations of a nuclear research reactor and its facilities offer opportunities for collection of rare environmental tracer datasets which can be used for atmospheric dispersion model evaluation studies. The HIFAR reactor near Sydney, Australia, routinely emits the radioactive noble gas 41Ar, and other radionuclides such as 133Xe and 135Xe are also emitted from nearby radiopharmaceutical production facilities. Despite extremely low emission levels of these gases, they are nevertheless detectable using state-of-the-art technology, and sensitive detectors have been placed at four locations in the surrounding region which features complex terrain. The high research potential of this unique dataset is illustrated in the current study, in which predictions from two atmospheric dispersion models used for emergency response are compared with 41Ar peak observations from the detector network under a range of stability conditions, and long-term integrated data is also compared with a routine impact assessment model.

Alastair G. Williams; Geoffrey H. Clark; Leisa Dyer; Richard Barton

2005-01-01T23:59:59.000Z

338

Development of Modeling Techniques for A Generation IV Gas Fast Reactor  

E-Print Network [OSTI]

Worldwide, multiple countries are investing a great deal of time and energy towards developing a new class of technologically advanced nuclear reactors. These new reactors have come to be known as the Generation IV (Gen IV) class of nuclear...

Dercher, Andrew Steven

2012-10-19T23:59:59.000Z

339

Copula Based Stochastic Weather Generator as an Application for Crop Growth Models and Crop Insurance  

E-Print Network [OSTI]

Stochastic Weather Generators (SWG) try to reproduce the stochastic patterns of climatological variables characterized by high dimensionality, non-normal probability density functions and non-linear dependence relationships. However, conventional...

Juarez Torres, Miriam 77-

2012-08-31T23:59:59.000Z

340

Power System Modeling of 20percent Wind-Generated Electricity by 2030  

E-Print Network [OSTI]

pulverized coal plants, combined cycle natural gas plants,natural gas plants, and combined cycle natural gas plants.generated largely from combined-cycle Capacity (GW) yd r as

Hand, Maureen

2008-01-01T23:59:59.000Z

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


341

Can a central pattern generator produce multiple motor patterns? Modeling scratch rhythms in turtle  

Science Journals Connector (OSTI)

A central pattern generator (CPG) is a population of neurons producing rhythmic or repetitive behavior (i.e. scratching, walking, masticating) without requiring rhythmic input to the population. Turtles are obser...

Abigail Snyder; Jonathan Rubin

2012-07-01T23:59:59.000Z

342

Study of Climate Change Impact on Flood Frequencies: A Combined Weather Generator and Hydrological Modeling Approach  

Science Journals Connector (OSTI)

Climate change is expected to lead to more frequent and intensive flooding problems for watersheds in the south part of China. This study presented a coupled Long Ashton Research Station Weather Generator (LARS-WG) and Semidistributed Land Use–...

X. S. Qin; Y. Lu

2014-06-01T23:59:59.000Z

343

A Risk-based Optimization Modeling Framework for Mitigating Fire Events for Water and Fire Response Infrastructures  

E-Print Network [OSTI]

of the Generalized Barrois Model Fitted to Observations in Finland (Tillander and Keski-Rahkonen 2002)???????? ? 85 4.2 Annual Frequency Distribution of Wind Direction ??????? . 95 4.3 Highest Risk Scenarios for Micropolis Generated from Monte Carlo...

Kanta, Lufthansa Rahman

2011-02-22T23:59:59.000Z

344

Transient Response of the Hadley Centre Coupled Ocean-Atmosphere Model to Increasing Carbon Dioxide. Part II: Spatial and Temporal Structure of Response  

Science Journals Connector (OSTI)

A high-resolution (2.75° lat × ° 3.75° long) coupled ocean-atmosphere model has been used to simulate the transient response of climate to a gradual increase in atmospheric carbon dioxide concentrations. Although the radiative forcing increases ...

J. M. Murphy; J. F. B. Mitchell

1995-01-01T23:59:59.000Z

345

Fractional Dynamical Model for the Generation of ECG like Signals from Filtered Coupled Van-der Pol Oscillators  

E-Print Network [OSTI]

In this paper, an incommensurate fractional order (FO) model has been proposed to generate ECG like waveforms. Earlier investigation of ECG like waveform generation is based on two identical Van-der Pol (VdP) family of oscillators which are coupled by time delays and gains. In this paper, we suitably modify the three state equations corresponding to the nonlinear cross-product of states, time delay coupling of the two oscillators and low-pass filtering, using the concept of fractional derivatives. Our results show that a wide variety of ECG like waveforms can be simulated from the proposed generalized models, characterizing heart conditions under different physiological conditions. Such generalization of the modelling of ECG waveforms may be useful to understand the physiological process behind ECG signal generation in normal and abnormal heart conditions. Along with the proposed FO models, an optimization based approach is also presented to estimate the VdP oscillator parameters for representing a realistic ECG like signal.

Saptarshi Das; Koushik Maharatna

2014-10-20T23:59:59.000Z

346

Modeling of nonlinear optic and ESR response of CDW MX materials  

SciTech Connect (OSTI)

We report results on the nonlinear optic and ESR response of the PtX MX chain materials calculated using a discrete, 3/4-filled, two-band, tight-binding Peierls-Hubbard model. We calculated electroabsorption (EA) spectra for the three PtX (X=Cl, Br, 1) charge-density-wave (CDW) materials and find good agreement with the experimental data. We also obtain EA spectra for localized defects in PtBr. In addition, the field orientation dependence of the electron spin resonance spectra associated with the spin carrying defects is calculated for PtX materials and compared with ESR data on photoinduced defects.

Saxena, A.; Gammel, J.T.; Bishop, A.R. [Los Alamos National Lab., NM (United States); Shuai, Z.; Bredas, J.L. [Center de Recherche en Electronique et Photonique Moleculaires, Universite de Mons-Hainaut (Belgium); Batistic, I. [Zagreb Univ. (Croatia). Dept. of Physics; Alouani, M. [Ohio State Univ., Columbus, OH (United States). Dept. of Physics

1994-09-01T23:59:59.000Z

347

Electric and magnetic response to the continuum for A=7 isobars in a dicluster model  

E-Print Network [OSTI]

Mirror isobars $^7$Li and $^7$Be are investigated in a dicluster model. The magnetic dipole moments and the magnetic dipole response to the continuum are calculated in this framework. The magnetic contribution is found to be small with respect to electric dipole and quadrupole excitations even at astrophysical energies, at a variance with the case of deuteron. Energy weighted molecular sum rules are evaluated and a formula for the molecular magnetic dipole sum rule is found which matches the numerical calculations. Cross-sections for photo-dissociation and radiative capture as well as the S-factor for reactions of astrophysical significance are calculated with good agreement with known experimental data.

A. Mason; R. Chatterjee; L. Fortunato; A. Vitturi

2008-11-11T23:59:59.000Z

348

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

349

Energy technologies for rural areas â?? decentralised power generation through MARKAL modelling: a case study  

Science Journals Connector (OSTI)

Due to shortage of power, extremely subsidised tariffs, poor financial recovery, long transmission lines, there exists a very poor demand-supply balance in the rural energy sectors of India. MARKAL bases analysis of a village-group in western India reveals that there is a potential of reducing the electricity demand by about 18% as compared to the business-as-usual case through adopting energy efficiency measures. Results show that in the studied area, renewable energy systems are not likely to penetrate without government subsidy. Sufficient potential was found for making the area independent from grid through decentralised electricity generation. Through decentralised electricity generation, there is a potential of reducing 2200 ton carbon-dioxide emissions as compared to the business-as-usual case. Electricity generation through bio-gas plants for domestic consumption and through photovoltaic systems for irrigation pumps have been found more attractive as compared to other options.

Jyotirmay Mathur

2007-01-01T23:59:59.000Z

350

Modeling marrow damage from response data: Morphallaxis from radiation biology to benzene toxicity  

SciTech Connect (OSTI)

Consensus principles from radiation biology were used to describe a generic set of nonlinear, first-order differential equations for modeling of toxicity-induced compensatory cell kinetics in terms of sublethal injury, repair, direct killing, killing of cells with unrepaired sublethal injury, and repopulation. This cellular model was linked to a probit model of hematopoietic mortality that describes death from infection and/or hemorrhage between {approximately} 5 and 30 days. Mortality data from 27 experiments with 851 doseresponse groups, in which doses were protracted by rate and/or fractionation, were used to simultaneously estimate all rate constants by maximum-likelihood methods. Data used represented 18,940 test animals distributed according to: (mice, 12,827); (rats, 2,925); (sheep, 1,676); (swine, 829); (dogs, 479); and (burros, 204). Although a long-term, repopulating hematopoietic stem cell is ancestral to all lineages needed to restore normal homeostasis, the dose-response data from the protracted irradiations indicate clearly that the particular lineage that is ``critical`` to hematopoietic recovery does not resemble stem-like cells with regard to radiosensitivity and repopulation rates. Instead, the weakest link in the chain of hematopoiesis was found to have an intrinsic radioresistance equal to or greater than stromal cells and to repopulate at the same rates. Model validation has been achieved by predicting the LD{sub 50} and/or fractional group mortality in 38 protracted-dose experiments (rats and mice) that were not used in the fitting of model coefficients.

Jones, T.D.; Morris, M.D.; Hasan, J.S.

1995-12-01T23:59:59.000Z

351

Responsible technology acceptance: Model development and application to consumer acceptance of Smart Grid technology  

Science Journals Connector (OSTI)

Abstract As a response to climate change and the desire to gain independence from imported fossil fuels, there is a pressure to increase the proportion of electricity from renewable sources which is one of the reasons why electricity grids are currently being turned into Smart Grids. In this paper, we focus on private consumers’ acceptance of having Smart Grid technology installed in their home. We analyse acceptance in a combined framework of the Technology Acceptance Model and the Norm Activation Model. We propose that individuals are only likely to accept Smart Grid technology if they assess usefulness in terms of a positive impact for society and the environment. Therefore, we expect that Smart Grid technology acceptance can be better explained when the well-known technology acceptance parameters included in the Technology Acceptance Model are supplemented by moral norms as suggested by the Norm Activation Model. We tested this proposition by means of an online survey of Danish (N = 323), Norwegian (N = 303) and Swiss (N = 324) private consumers. The study confirms that adding personal norms to the independent variables of the Technology Acceptance Model leads to a significant increase in the explained variance in consumer acceptance of Smart Grid technology in all three countries.

Madeleine Broman Toft; Geertje Schuitema; John Thřgersen

2014-01-01T23:59:59.000Z

352

Response of a Coupled Ocean–Atmosphere Model to Increasing Atmospheric Carbon Dioxide: Sensitivity to the Rate of Increase  

Science Journals Connector (OSTI)

The influence of differing rates of increase of the atmospheric CO2 concentration on the climatic response is investigated using a coupled ocean–atmosphere model. Five transient integrations are performed each using a different constant ...

Ronald J. Stouffer; Syukuro Manabe

1999-08-01T23:59:59.000Z

353

A process for evaluation and state approval of an emergency response atmospheric dispersion model for Rocky Flats, Colorado  

SciTech Connect (OSTI)

This document contains copies of the vugraphs used by C. R. Hodgin for the November 6, 1991 presentation summarizing the process to be used for evaluation of the Emergency Response Dispersion Model. (MHB)

Hodgin, C.R.

1991-11-06T23:59:59.000Z

354

Nodalization study of the Westinghouse Model E steam generator secondary side  

E-Print Network [OSTI]

. This relationship suggests a need to accurately predict the behavior of a steam generator on both the primary and secondary sides. A pressurized Hater zeactor (PWR) consists of three major components: 1) the primary system core, 2) the steam generators and, 3...: Base Case Liquid Level for Turbine Trip 35 lD CL e ~ EO W I? w + C4 L3 gl 20 40 60 TINE ( SECONDS ) BO LOO Figure 8: Base Case Primary Cold Leg Temperature for Turbine Trip capabilities decrease because of the reduction in two-phase heat...

Montgomery, Robert Orval

1987-01-01T23:59:59.000Z

355

STOCHASTIC MODELS OF SPACE RADIATION DNA DAMAGE RESPONSES AND CANCER RISKS  

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

STOCHASTIC MODELS OF SPACE RADIATION DNA DAMAGE STOCHASTIC MODELS OF SPACE RADIATION DNA DAMAGE RESPONSES AND CANCER RISKS Francis A. Cucinotta 1 , Janice M. Pluth 2 , Artem Ponomarev 3 , Shaowen Hu 3 , Jennifer Anderson 4 , Jane Harper 4 , and Peter O'Neill 4 1 NASA Lyndon B. Johnson Space Center, Houston TX, USA; 2 Lawrence Berkeley National Laboratory, Berkeley CA, USA; 3 U.S.R.A., Division of Life Sciences, Houston TX, USA; 4 MRC Radiation and Genome Stability Unit, Harwell, Didcot, UK Abstract: On space missions astronauts are exposed to a steady flux of galactic cosmic rays (GCR) consisting of high-energy protons and heavy ions. In the next decades long- term missions of up to 200 days to the Earth's moon and 1100 days to Mars are planed by NASA where cumulative doses will not be low (>100 mSv) albeit dose-

356

Automatic Generation and Evolution of Model Transformations Using Ontology Engineering Space  

Science Journals Connector (OSTI)

Model-driven software development facilitates faster and more flexible integration of information and communication systems. It divides system descriptions into models of different view points and abstraction levels. To effectively realize cross-organisational ...

Stephan Roser; Bernhard Bauer

2008-12-01T23:59:59.000Z

357

An Arnoldi Approach for Generation of Reduced Order Models for Turbomachinery  

E-Print Network [OSTI]

A linear reduced-order aerodynamic model is developed for aeroelastic analysis of turbo-machines. The basis vectors are constructed using a block Arnoldi method. Although the model is cast in the time domain in state-space ...

Willcox, Karen

1999-01-01T23:59:59.000Z

358

Efficient 3D building model generation from 2D floor plans  

E-Print Network [OSTI]

3D building models are beneficial to architects, interior designers, and ordinary people in visualizing indoor space in three dimensions. 3D building models appear to be more aesthetic to ordinary people than architectural ...

Kashlev, Dmitry

2008-01-01T23:59:59.000Z

359

A model generating shell for mapping SIMAN to MOR/DOS  

E-Print Network [OSTI]

, advice and involvement in this research. TABLE OF CONTENTS Page CHAPTER I INTRODUCTION. Objective. Simulation ? A Proven Tool for System Designers. . . Simulation Languages. . . . Motivation for This Research. . . . 13 CHAPTER 11 MODEL... of designing a model of a real system, and conducting experiments with this model for the purpose of understanding the behavior of the system and/or evaluating various strategies for the operation of the system. Simulation involves the modeling of a process...

Venkata Perumal, Ramesh

2012-06-07T23:59:59.000Z

360

Model-Experimental Studies on Next-generation Li-ion Materials...  

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

More Documents & Publications Performance and Degradation Modeling of Batteries Improved Methods for Making Intermetallic Anodes Overview of Applied Battery Research...

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


361

Business Rules Generation methods by Merging Model Driven Architecture and Web Semantics  

E-Print Network [OSTI]

by combining concepts coming from Model Driven Architecture and Semantic Web using the Ontology Definition . In another side, researches in Semantic Web, especially the use of ontologies, give many possibilities begins with the development of one or more requirement models called Computation Independent Model (CIM

Boyer, Edmond

362

Modelling and control of a variable speed wind turbine driving doubly fed induction generator using three-level PWM converter  

Science Journals Connector (OSTI)

The aim of this researcher is to develop a complete wind central model driven doubly fed induction generator (DFIG) which feeds an AC power grid. For that, two-pulse width modulated (PWM) voltage converters are connected back to back between the rotor terminals of DFIG and the utility grid via a common DC link, in there, our contribution will appear in the utilisation of three levels voltage inverters in order to ameliorate the energy quality. The simulation was carried out on a 2 MW wind-turbine driven DFIG system and the developed unified model validity and the proposed control strategies feasibility are all confirmed by the simulated results.

Fairouz Kendouli; Khoudir Abed; Khalil Nabti; Hocine Benalla

2012-01-01T23:59:59.000Z

363

Automatic rule generation for procedural modeling of a sketched tree using genetic  

E-Print Network [OSTI]

, The algorithmic beauty of plants, Springer- Verlag, 1996. P.Tan, G. Zeng, J. Wang, S. Kang, and L. Quan, Image efficiency. · Dynamism (i.e. growth process). · Scalability (i.e. growth level). · Portability. · Generating) Mathematical theory of plant development. The central concept is rewriting. Defining complex objects

Lee, WonSook

364

A multistage model for distribution expansion planning with distributed generation in a deregulated electricity market  

Science Journals Connector (OSTI)

Distribution systems management is becoming an increasingly complicated issue due to the introduction of new technologies, new energy trading strategies and a new deregulated environment. In the new deregulated energy market and considering the incentives ... Keywords: GAMS-MATLAB interface, distributed generation (DG), distribution company (DISCO), investment payback time, microturbine, social welfare

S. Porkar; A. Abbaspour-Tehrani-Fard; P. Poure; S. Saadate

2010-06-01T23:59:59.000Z

365

Realistic fault modeling and quality test generation of combined delay faults  

E-Print Network [OSTI]

for the dynamic behavior of the circuit. Due to the signal integrity problem, the testing of VLSI-chips is becoming more complex. A static test vector generated to test a defect in an integrated chip can be found ineffective under the effect of capacitively...

Thadhlani, Ajaykumar A

2012-06-07T23:59:59.000Z

366

Modeling and Control of Co-generation Power Plants: A Hybrid System Approach  

E-Print Network [OSTI]

cycle is driven by some fossil fuel (usually natural gas) and produces electric power via expansion of the gas turbine and generates both electricity and steam for the industrial processes. Clearly, the liberalization of the energy market has promoted the need of operating CCPPs in the most efficient way

Ferrari-Trecate, Giancarlo

367

Imaging Tumor Variation in Response to Photodynamic Therapy in Pancreatic Cancer Xenograft Models  

SciTech Connect (OSTI)

Purpose: A treatment monitoring study investigated the differential effects of orthotopic pancreatic cancer models in response to interstitial photodynamic therapy (PDT), and the validity of using magnetic resonance imaging as a surrogate measure of response was assessed. Methods and Materials: Different orthotopic pancreatic cancer xenograft models (AsPC-1 and Panc-1) were used to represent the range of pathophysiology observed in human beings. Identical dose escalation studies (10, 20, and 40J/cm) using interstitial verteporfin PDT were performed, and magnetic resonance imaging with T2-weighted and T1-weighted contrast were used to monitor the total tumor volume and the vascular perfusion volume, respectively. Results: There was a significant amount of necrosis in the slower-growing Panc-1 tumor using high light dose, although complete necrosis was not observed. Lower doses were required for the same level of tumor kill in the faster-growing AsPC-1 cell line. Conclusions: The tumor growth rate and vascular pattern of the tumor affect the optimal PDT treatment regimen, with faster-growing tumors being relatively easier to treat. This highlights the fact that therapy in human beings shows a heterogeneous range of outcomes, and suggests a need for careful individualized treatment outcomes assessment in clinical work.

Samkoe, Kimberley S., E-mail: samkoe@dartmouth.ed [Thayer School of Engineering, Dartmouth College, Hanover, NH (United States); Chen, Alina [Thayer School of Engineering, Dartmouth College, Hanover, NH (United States); Rizvi, Imran [Thayer School of Engineering, Dartmouth College, Hanover, NH (United States); Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA (United States); O'Hara, Julia A. [Thayer School of Engineering, Dartmouth College, Hanover, NH (United States); Hoopes, P. Jack [Thayer School of Engineering, Dartmouth College, Hanover, NH (United States); Department of Surgery, Dartmouth Medical School, Hanover, NH (United States); Pereira, Stephen P. [Institute of Hepatology, University College London Medical School, London (United Kingdom); Hasan, Tayyaba [Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA (United States); Pogue, Brian W. [Thayer School of Engineering, Dartmouth College, Hanover, NH (United States); Wellman Center for Photomedicine, Massachusetts General Hospital, Boston, MA (United States); Department of Surgery, Dartmouth Medical School, Hanover, NH (United States)

2010-01-15T23:59:59.000Z

368

A new approach to modeling and simulation of small scale tidal power generation  

SciTech Connect (OSTI)

Owing to the dynamic nature of the tide behavior and complex relationship between the flow and the head, the model is one of the most challenging and complex tasks. It is acknowledged in the literature that a more sophisticated model can lead to better results and accuracy. In this report the authors propose an artificial neural network to capture the complex relationship of tide dynamics as against the conventional models. The model is tested on the existing site located near Bombay. The training patterns are derived directly form field data. The model is employed for estimating maximum energy potential. The simulations carried out for the existing site are presented and discussed.

Khaparde, S.A.; Deokar, D.N.; Sukhatme, S.P. [Indian Inst. of Tech., Bombay (India). Dept. of Mechanical Engineering

1996-11-01T23:59:59.000Z

369

Three Generations of SUSY Standard Model of Nambu-Goto String  

E-Print Network [OSTI]

A four dimensional Superstring is constructed starting from a twenty six dimensional bosonic string. Fermions are introduced by noting the Manselstam's proof of equivalence of two fermions to one boson in 1+1 dimensions. The action of the superstring is invariant under SO(6)$\\times$ SO(5). It has four bosonic coordinates and twenty four Majorana fermions of SO(3,1) representing two transverse modes of super fermions and conformal ghosts (b,c). The super conformal ghosts ($\\beta, \\gamma$) are the quanta of an extended Hilbert space of the remaining longitudinal modes of two superfermions. The massless spectrum obtained by quantising the action, contain vector mesons which are generators of the SO(6)$\\times$SO(5). Using Wilson loops, this product group is proven to descend to $Z_3\\times SU(3)\\times SU(2)\\times U(1)$ without breaking supersymmetry.Thus there are just three generations of quarks and leptons.

B. B. Deo

2005-01-05T23:59:59.000Z

370

Modeling of damage generation mechanisms in silicon at energies below the displacement threshold  

Science Journals Connector (OSTI)

We have used molecular dynamics simulation techniques to study the generation of damage in Si within the low-energy deposition regime. We have demonstrated that energy transfers below the displacement threshold can produce a significant amount of damage, usually neglected in traditional radiation damage calculations. The formation of amorphous pockets agrees with the thermal spike concept of local melting. However, we have found that the order-disorder transition is not instantaneous, but it requires some time to reach the appropriate kinetic-potential energy redistribution for melting. The competition between the rate of this energy redistribution and the energy diffusion to the surrounding atoms determines the amount of damage generated by a given deposited energy. Our findings explain the diverse damage morphology produced by ions of different masses.

Iván Santos; Luis A. Marqués; Lourdes Pelaz

2006-11-21T23:59:59.000Z

371

Neutral Higgs Boson Pair Production in Standard Model with the Fourth Generation Quarks at LHC  

Science Journals Connector (OSTI)

We investigated the neutral Higgs boson pair production at the CERN Large Hadron Collider (LHC) in the SM with four families. We found that the gluon-gluon fusion mode is the most dominant one in producing neutral Higgs boson pair at the LHC, and it can be used to probe the trilinear Higgs coupling. If the heavy quarks of the fourth generation really exist within the SM, they can manifest their effect on the cross section of the Higgs pair production process at the LHC. Our numerical results show that there will be neutral Higgs boson pair production events per year if the next generation heavy quarks really exist, while there will be only events produced per year if there are only three families in the SM.

Sun Hao; Ma Wen-Gan; Zhou Ya-Jin; Sun Yan-Bin; Zhang Ren-You; Hou Hong-Sheng

2004-01-01T23:59:59.000Z

372

Fuel Cell Tri-Generation System Case Study using the H2A Stationary Model  

Broader source: Energy.gov [DOE]

Overview of H2A stationary model concept, results, strategy for analysis, Federal incentives for fuel cells, and summary of next steps

373

A sustainable model for training teachers to use pivotal response training  

E-Print Network [OSTI]

J. R. , (1995). Pyramidal staff training in the extension ofvia pivotal response training and the individualization ofof pivotal response training. Journal of Speech, Language

Suhrheinrich, Jessica Brooke

2010-01-01T23:59:59.000Z

374

Model Estimates of M2 Internal Tide Generation over Mid-Atlantic Ridge Topography  

Science Journals Connector (OSTI)

The conversion of barotropic to baroclinic M2 tidal energy is examined for a section of the Mid-Atlantic Ridge in the Brazil Basin using a primitive equation model. Model runs are made with different horizontal smoothing (1.5, 6, and 15 km) ...

N. V. Zilberman; J. M. Becker; M. A. Merrifield; G. S. Carter

2009-10-01T23:59:59.000Z

375

Modeling and analysis of the latent period of osteosarcomas induced by incorporated 239Pu: The role of immune responses  

Science Journals Connector (OSTI)

This paper considers the utility of a stochastic model of carcinogenesis, proposed earlier by Yakovlev and Polig, in quantitative analysis of the incidence of radiation-induced osteosarcomas in beagels injected with various amounts of ^2^3^9Pu. The original ... Keywords: Bone tumors, Carcinogenesis models, Immune response, Internal irradiation, Survival analysis

A. D. Tsodikov; F. Bruenger; R. D. Lloyd; S. Miller; E. Polig; A. Yu. Yakovlev

2001-06-01T23:59:59.000Z

376

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

377

Mechanical Response and Decomposition of Thermally Degraded Energetic Materials: Experiments and Model Simulations  

SciTech Connect (OSTI)

We report progress of a continuing effort to characterize and simulate the response of energetic materials (EMs), primarily HMX-based, under conditions leading to cookoff. Our experiments include mechanical-effects testing of HMX and FIMX with binder at temperatures nearing decomposition thresholds. Additional experiments have focused on decomposition of these EMs under confinement, measuring evolution of gas products and observing the effect of pressurization on the solid. Real-time measurements on HMX show abrupt changes that maybe due to sudden void collapse under increasing load. Postmortem examination shows significant internal damage to the pellets, including voids and cracks. These experiments have been used to help develop a constitutive model for pure HMX. Unconfined uniaxial compression tests were performed on HMX and LX-14 to examine the effect of binders on the deviatoric strength of EM pellets, and to assess the need of including deviatoric terms in the model. A scale-up experiment will be described that is being developed to validate the model and provide additional diagnostics.

KANESHIGE,MICHAEL J.; RENLUND,ANITA M.; SCHMITT,ROBERT G.; WELLMAN,GERALD W.

1999-10-14T23:59:59.000Z

378

Prediction modeling of physiological responses and human performance in the heat  

Science Journals Connector (OSTI)

Over the last two decades, our laboratory has been establishing the data base and developing a series of predictive equations for deep body temperature, heart rate and sweat loss responses of clothed soldiers performing physical work at various environmental extremes. Individual predictive equations for rectal temperature, heart rate and sweat loss as a function of the physical work intensity, environmental conditions and particular clothing ensemble have been published in the open literature. In addition, important modifying factors such as energy expenditure, state of heat acclimation and solar heat load have been evaluated and appropriate predictive equations developed. Currently, we have developed a comprehensive model which is programmed on a Hewlett-Packard 41 CV hand held calculator. The primary physiological inputs are deep body (rectal) temperature and sweat loss while the predicted outputs are the expected physical work-rest cycle, the maximum single physical work time if appropriate, and the associated water requirements. This paper presents the mathematical basis employed in the development of the various individual predictive equations of our heat stress model. In addition, our current heat stress prediction model as programmed on the HP 41 CV is discussed from the standpoint of propriety in meeting the Army's needs and therefore assisting in military mission accomplishment.

Kent B. Pandolf; Leander A. Stroschein; Lawrence L. Drolet; Richard R. Gonzalez; Michael N. Sawka

1986-01-01T23:59:59.000Z

379

Coupled numerical modelling of power loss generation in busbar system of low-voltage switchgear  

Science Journals Connector (OSTI)

Abstract This paper presents a coupled mathematical model of the heat transfer processes in an electric switchgear. The considered problem required the computation of the detailed distribution of the power losses and all the heat transfer modes (radiation, convection, and conduction) within a unit. In this complex thermal analysis, different definitions of electric busbar heating were considered and compared. The most advanced model, which couples the thermal and electromagnetic fields in two ways, was also compared with the simplified approaches. First, the direct current loading of the busbar, which neglected the alternating current effects, was considered. Second, models that included only one method of coupling were calculated for different assumed average busbar temperatures. Finally, the model with the two-way coupling, which took the eddy currents and proximity effects into account, was simulated using an iteration loop between the electromagnetic and fluid flow solvers. This study employed a geometrical model of industrial low-voltage switchgear. The presented mathematical model was also validated against temperature measurements carried out by a certified laboratory. The obtained results show that a fully coupled model produces very satisfactory agreement between computed and experimental data.

Mateusz Bedkowski; Jacek Smolka; Krzysztof Banasiak; Zbigniew Bulinski; Andrzej J. Nowak; Tomasz Tomanek; Adam Wajda

2014-01-01T23:59:59.000Z

380

A Generic Biogeochemical Module for Earth System Models: Next Generation BioGeoChemical Module (NGBGC), Version 1.0  

SciTech Connect (OSTI)

Physical and biogeochemical processes regulate soil carbon dynamics and CO2 flux to and from atmosphere, influencing global climate changes. Integration of these processes into earth system models (e.g., community land models (CLM)), however, currently faces three major challenges: 1) extensive efforts are required to modify modeling structures and to rewrite computer programs to incorporate new or updated processes as new knowledge is being generated, 2) computational cost is prohibitively expensive to simulate biogeochemical processes in land models due to large variations in the rates of biogeochemical processes, and 3) various mathematical representations of biogeochemical processes exist to incorporate different aspects of fundamental mechanisms, but systematic evaluation of the different mathematical representations is difficult, if not possible. To address these challenges, we propose a new computational framework to easily incorporate physical and biogeochemical processes into land models. The new framework consists of a new biogeochemical module with a generic algorithm and reaction database so that new and updated processes can be incorporated into land models without the need to manually set up the ordinary differential equations to be solved numerically. The reaction database consists of processes of nutrient flow through the terrestrial ecosystems in plants, litter and soil. This framework facilitates effective comparison studies of biogeochemical cycles in an ecosystem using different conceptual models under the same land modeling framework. The approach was first implemented in CLM and benchmarked against simulations from the original CLM-CN code. A case study was then provided to demonstrate the advantages of using the new approach to incorporate a phosphorus cycle into the CLM model. To our knowledge, the phosphorus-incorporated CLM is a new model that can be used to simulate phosphorus limitation on the productivity of terrestrial ecosystems.

Fang, Yilin; Huang, Maoyi; Liu, Chongxuan; Li, Hongyi; Leung, Lai-Yung R.

2013-11-13T23:59:59.000Z

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


381

Model-based development and calibration of last generation diesel powertrains for passenger cars  

Science Journals Connector (OSTI)

This paper presents an original model-based approach to the system level development and calibration of diesel powertrains for passenger cars, implemented in a comprehensive software tool. The models for the different subsystems are coupled to execute optimisation loops, involving also the system calibration, and are characterised by flexibility of usage, limited tuning effort and reduced computational time. As an example of the general approach, the engine model is described and some results from its execution are shown and compared with the measurements. Finally, a practical example is given of the usage of the tool for system level optimisation through a specifically developed methodology.

Fabio Mallamo; Federico Millo; Luciano Rolando

2014-01-01T23:59:59.000Z

382

Modeling the response of plants and ecosystems to elevated CO{sub 2} and climate change  

SciTech Connect (OSTI)

While the exact effects of elevated CO{sub 2} on global climate are unknown, there is a growing consensus among climate modelers that global temperature and precipitation will increase, but that these changes will be non-uniform over the Earth`s surface. In addition to these potential climatic changes, CO{sub 2} also directly affects plants via photosynthesis, respiration, and stomatal closure. Global climate change, in concert with these direct effects of CO{sub 2} on plants, could have a significant impact on both natural and agricultural ecosystems. Society`s ability to prepare for, and respond to, such changes depends largely on the ability of climate and ecosystem researchers to provide predictions of regional level ecosystem responses with sufficient confidence and adequate lead time.

Reynolds, J.F.; Hilbert, D.W.; Chen, Jia-lin; Harley, P.C.; Kemp, P.R.; Leadley, P.W.

1992-03-01T23:59:59.000Z

383

Modeling the response of plants and ecosystems to elevated CO sub 2 and climate change  

SciTech Connect (OSTI)

While the exact effects of elevated CO{sub 2} on global climate are unknown, there is a growing consensus among climate modelers that global temperature and precipitation will increase, but that these changes will be non-uniform over the Earth's surface. In addition to these potential climatic changes, CO{sub 2} also directly affects plants via photosynthesis, respiration, and stomatal closure. Global climate change, in concert with these direct effects of CO{sub 2} on plants, could have a significant impact on both natural and agricultural ecosystems. Society's ability to prepare for, and respond to, such changes depends largely on the ability of climate and ecosystem researchers to provide predictions of regional level ecosystem responses with sufficient confidence and adequate lead time.

Reynolds, J.F.; Hilbert, D.W.; Chen, Jia-lin; Harley, P.C.; Kemp, P.R.; Leadley, P.W.

1992-03-01T23:59:59.000Z

384

Physical modeling of wind turbine generators in a small scale analog system  

E-Print Network [OSTI]

This project represents the physical modeling and experimental test of a Doubly-fed Induction Machine (DFIM), in order to substantially analyze the characteristic behaviors of wind turbines and its use in the micro-grid ...

Wang, Xuntuo

2014-01-01T23:59:59.000Z

385

A comparison of two approaches for generating spatial models of growing season variables for Canada  

Science Journals Connector (OSTI)

This study produced annual spatial models (or grids) of 27 growing season variables for Canada that span two centuries (1901-2100). Temporal gaps in the availability of daily climate data – the typical and preferred source for calculating growing ...

John H. Pedlar; Daniel W. McKenney; Kevin Lawrence; Pia Papadopol; Michael F. Hutchinson; David Price

386

Design of a next-generation regional weather research and forecast model.  

SciTech Connect (OSTI)

The Weather Research and Forecast (WRF) model is a new model development effort undertaken jointly by the National Center for Atmospheric Research (NCAR), the National Oceanic and Atmospheric Administration (NOAA), and a number of collaborating institutions and university scientists. The model is intended for use by operational NWP and university research communities, providing a common framework for idealized dynamical studies, fill physics numerical weather prediction, air-quality simulation, and regional climate. It will eventually supersede large, well-established but aging regional models now maintained by the participating institutions. The WRF effort includes re-engineering the underlying software architecture to produce a modular, flexible code designed from the outset to provide portable performance across diverse computing architectures. This paper outlines key elements of the WRF software design.

Michalakes, J.

1999-01-13T23:59:59.000Z

387

Inference-based Geometric Modeling for the Generation of Complex Cluttered Virtual Environments  

E-Print Network [OSTI]

algorithm is capable of identifying objects of interest amongst a cluttered scene, and reconstructing complete representations of these objects even in the presence of occluded surfaces. This approach incorporates a predictive modeling framework that uses... of parts sampled from the input models. Finally, we a rm our motivation by showing an application of these two ap- proaches. We demonstrate how the constructed environments can be easily used within a physically-based simulation, capable of supporting...

Biggers, Keith Edward

2012-07-16T23:59:59.000Z

388

Generator Dynamic Model Validation and Parameter Calibration Using Phasor Measurements at the Point of Connection  

SciTech Connect (OSTI)

Disturbance data recorded by phasor measurement units (PMU) offers opportunities to improve the integrity of dynamic models. However, manually tuning parameters through play-back events demands significant efforts and engineering experiences. In this paper, a calibration method using the extended Kalman filter (EKF) technique is proposed. The formulation of EKF with parameter calibration is discussed. Case studies are presented to demonstrate its validity. The proposed calibration method is cost-effective, complementary to traditional equipment testing for improving dynamic model quality.

Huang, Zhenyu; Du, Pengwei; Kosterev, Dmitry; Yang, Steve

2013-05-01T23:59:59.000Z

389

A Numerical Model Without Truncation Error for a Steady-State Analysis of a Once-Through Steam Generator  

SciTech Connect (OSTI)

To overcome the drawbacks of conventional schemes for a numerical analysis of a steam generator (SG), an efficient numerical model has been developed to analyze the steady state of a once-through-type SG where the feedwater is heated to superheated steam. In the developed model, the temperature and enthalpy are defined at the boundary of a calculation cell, and the exact solutions for the temperature distribution in a calculation cell are utilized. This feature of the developed model frees calculation from the undesirable effects of numerical diffusion, and only a small number of nodes are required. Also, the developed model removes the ambiguity from the parameter values at the inlet and exit of a calculation.The BoSupSG-SS computer code was developed by using the analysis model, and it performed well with only three calculation nodes to analyze a superheated SG. The developed model can be effectively used for the cases where a fast one-dimensional calculation is required such as an SG or system design analysis.

Sim, Yoon Sub; Kim, Eui Kwang; Eoh, Jae Hyuk [Korea Atomic Energy Research Institute (Korea, Republic of)

2005-06-15T23:59:59.000Z

390

Singlet oxygen generation according to flame-sheet and finite-rate chlorine/BHP reaction models. [Basic Hydrogen Peroxide  

SciTech Connect (OSTI)

In a flowing chemical oxygen--iodine laser, the photon energy is emitted by excited iodine atoms. These atoms are produced by energy transfer from O[sub 2]([sup 1][Delta]) after molecular iodine is dissociated upon mixing and reaction with the O[sub 2]([sup 1][Delta]). The generation of singlet delta oxygen, O[sub 2]([sup 1][Delta]), following gaseous chlorine diffusion into and reaction with liquid basic hydrogen peroxide (solution of KOH or NaOH in H[sub 2]O[sub 2] and H[sub 2]O) is investigated. Both flame-sheet and finite-rate reaction models for Cl[sub 2]/BHP are developed. A closed-form solution for the O[sub 2]([sup 1][Delta]) yield is obtained with the flame-sheet analysis, while a solution involving an integral equation is derived with the finite-rate analysis. The models are applied to a rotating disk type O[sub 2]([sup 1][Delta]) generator for illustration. The results do not differ greatly between the two models, and they show favorable agreement with reported experimental data.

Quan, V.; Copeland, D.A.; Blauer, J.A.; Rodriguez, S.E. (Rockwell International, Canoga Park, CA (United States). Rocketdyne Div.)

1994-05-01T23:59:59.000Z

391

Estimation of vocal?tract area function from lip impulse response based on lossy vocal?tract digital filter model  

Science Journals Connector (OSTI)

A method for estimating vocal?tract area function from lip impulse response based on lossy vocal?tract digital filter model is provided. Previous methods of lip impulse response [M. M. Sondhi and J. R. Resnick 73 985–1002 (1983)] determines the area function from impulse response measured at lips by using the incident signal excited outside the oral cavity. This method is sensitive to the noise of measured impulse response. An alternative method [M. Honda and T. Mochida Proc. 1st ETRW?SPM 167–170 (1996)] is advantageous for accurate estimation under noisy acoustic condition based on the vocal?tract digital filter model that optimizes the M sections of areas by using the impulse response longer than M samples. In this method however the vocal?tract model is based on the transmission line that treats the effect of loss in simplified form. The new method proposed in this study applies a mixture model of the lossless distributed circuit and the lumped circuit accounting for effects such as viscous loss heat conduction loss and loss due to wall vibration. The results on acoustic measurements have shown that the new method has better performance over the old method using optimization scheme based on simplified transmission line model. [Work supported by CREST JST.

2001-01-01T23:59:59.000Z

392

System Modeling and Design Optimization for a Next-Generation Unattended Sensor  

SciTech Connect (OSTI)

We are developing a next-generation unattendedsensor that can detect and identify radiation sources while operating on battery power for several weeks. The system achieves smaller size and weight over systems that use NaI:Tl and 3He detectors by using a relatively new scintillator, Cs2LiYCl6:Ce:Ce (CLYC). This material can detect both gamma rays and thermal neutrons, has energy resolution of ~4% full width at half maximum at 662 keV, and allows for particle discrimination by pulse amplitude as well as pulse shape. The overall design features an array of sixteen CLYC detectors, each read out by a photomultiplier tube and custom pulse processing electronics. A field-programmable gate array analyzes the energy spectra using computationally efficient algorithms for anomaly detection.

McDonald, Benjamin S.; Myjak, Mitchell J.; Hensley, Walter K.; Smart, John E.

2013-04-01T23:59:59.000Z

393

Applying Learning Curves to Modeling Future Coal and Gas Power Generation Technologies  

Science Journals Connector (OSTI)

Other potential improvements to the model include an expansion to cover competing energy technologies not included in the current model such as nuclear, wind, and solar. ... Given the dominance of power plant emissions of greenhouse gases, and the growing worldwide interest in CO2 capture and storage (CCS) as a potential climate change mitigation option, the expected future cost of power plants with CO2 capture is of significant interest. ... Bergek, A.; Tell, F.; Berggren, C.; Watson, J.Technological Capabilities and Late Shakeouts: Industrial Dynamics in the Advanced Gas Turbine Industry, 1987–2002 Industrial and Corporate Change 2008, 17 ( 2) 335– 392 ...

Chris Ordowich; John Chase; Daniel Steele; Ripudaman Malhotra; Michiaki Harada; Keiji Makino

2011-11-28T23:59:59.000Z

394

Pharmacokinetic calculator program for generation of initial parameter estimates from a three-compartment infusion model  

Science Journals Connector (OSTI)

A polyexponential curve-stripping program, kin, is described for use on the HP-41CV programmable calculator. The program may be used in the analysis of plasma-concentration-time curves for a three-compartment intravenous bolus or infusion model with linear elimination processes. The coefficients and hybrid rate constants of the exponential function are then used to compute pharmacokinetic parameters (volume of the central compartment, intercompartmental rate transfer constants), which may be used as initial estimates of model parameters in non-linear regression curve-fitting procedures.

James D. Henderson; Richard D. Olson; William R. Ravis

1985-01-01T23:59:59.000Z

395

Next Generation Models for Storage and Representation of Microbial Biological Annotation  

SciTech Connect (OSTI)

Background Traditional genome annotation systems were developed in a very different computing era, one where the World Wide Web was just emerging. Consequently, these systems are built as centralized black boxes focused on generating high quality annotation submissions to GenBank/EMBL supported by expert manual curation. The exponential growth of sequence data drives a growing need for increasingly higher quality and automatically generated annotation. Typical annotation pipelines utilize traditional database technologies, clustered computing resources, Perl, C, and UNIX file systems to process raw sequence data, identify genes, and predict and categorize gene function. These technologies tightly couple the annotation software system to hardware and third party software (e.g. relational database systems and schemas). This makes annotation systems hard to reproduce, inflexible to modification over time, difficult to assess, difficult to partition across multiple geographic sites, and difficult to understand for those who are not domain experts. These systems are not readily open to scrutiny and therefore not scientifically tractable. The advent of Semantic Web standards such as Resource Description Framework (RDF) and OWL Web Ontology Language (OWL) enables us to construct systems that address these challenges in a new comprehensive way. Results Here, we develop a framework for linking traditional data to OWL-based ontologies in genome annotation. We show how data standards can decouple hardware and third party software tools from annotation pipelines, thereby making annotation pipelines easier to reproduce and assess. An illustrative example shows how TURTLE (Terse RDF Triple Language) can be used as a human readable, but also semantically-aware, equivalent to GenBank/EMBL files. Conclusions The power of this approach lies in its ability to assemble annotation data from multiple databases across multiple locations into a representation that is understandable to researchers. In this way, all researchers, experimental and computational, will more easily understand the informatics processes constructing genome annotation and ultimately be able to help improve the systems that produce them.

Quest, Daniel J [ORNL; Land, Miriam L [ORNL; Brettin, Thomas S [ORNL; Cottingham, Robert W [ORNL

2010-01-01T23:59:59.000Z

396

Modeling and Generation of Space-Time Correlated Signals for Sensor Network Fields  

E-Print Network [OSTI]

and recovery in Wireless Sensor Networks (WSNs) have utilized the spatio-temporal statistics of real world signals in order to achieve good performance in terms of energy savings and improved signal reconstruction address this gap by devising a mathematical model for real world signals that are correlated in space

Rossi, Michele

397

Optimal Velocity Profile Generation for given Acceleration Limits; The Half-Car Model Case  

E-Print Network [OSTI]

average curvature, or a path of minimum combined cost. Since the dynamics of the vehicle are not included. Velenis and P. Tsiotras Georgia Institute of Technology School of Aerospace Engineering, Atlanta, GA, USA is an extension of [1] where a point-mass model of the vehicle was used. The acceleration envelope of the vehicle

Tsiotras, Panagiotis

398

Modification of the Physics and Numerics in a Third-Generation Ocean Wave Model  

Science Journals Connector (OSTI)

The ocean wave model WAM was recently upgraded to improve the coupling between the sea state and the air flow and, in particular, enhance the growth of young wind sea over that of old wind sea. Prior to this change, numerous validations of the ...

Leslie C. Bender

1996-06-01T23:59:59.000Z

399

The construction of next-generation matrices for compartmental epidemic models  

Science Journals Connector (OSTI)

...for 2 2 matrices (equation (2.12)) applied to K S: 4.3. A model for bovine viral...Massey University and the University of Utrecht for supporting his sabbatical period of research in Utrecht. The authors are very grateful to Gary...

2010-01-01T23:59:59.000Z

400

A kinematic rupture model generator incorporating spatial interdependency of earthquake source parameters  

Science Journals Connector (OSTI)

......waves, we use a matching-filter in the wavelet domain (Pengcheng Liu, Personal Communication 2008) to combine seismograms...directed to the corresponding author for the article. We thank Pengcheng Liu for the code used for LAH and the modelling of broad-band......

J. Schmedes; Ralph J. Archuleta; Daniel Lavallée

2013-01-01T23:59:59.000Z

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


401

The El Nino-Southern Oscillation in the second Hadley Centre coupled model and its response to greenhouse warming  

SciTech Connect (OSTI)

This paper describes El Nino-Southern Oscillation (ENSO) interannual variability simulated in the second Handley Centre coupled model under control and greenhouse warming scenarios. The model produces a very reasonable simulation of ENSO in the control experiment--reproducing the amplitude, spectral characteristics, and phase locking to the annual cycle that are observed in nature. The mechanism for the model ENSO is shown to be a mixed SST-ocean dynamics mode that can be interpreted in terms of the ocean recharge paradigm of Jin. In experiments with increased levels of greenhouse gases, no statistically significant changes in ENSO are seen until these levels approach four times preindustrial values. In these experiments, the model ENSO has an approximately 20% larger amplitude, a frequency that is approximately double that of the current ENSO (implying more frequent El Ninos and La Ninas), and phase locks to the annual cycle at a different time of year. It is shown that the increase in the vertical gradient of temperature in the thermocline region, associated with the model's response to increased greenhouse gases, is responsible for the increase in the amplitude of ENSO, while the increase in meridional temperature gradients on either side of the equator, again associated with the models response to increasing greenhouse gases, is responsible for the increased frequency of ENSO events.

Collins, M.

2000-04-01T23:59:59.000Z

402

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

403

Generation of CD8+ and CD4+ T-Cell Response to Dendritic Cells Genetically Engineered to Express the MART-1/Melan-A Gene  

Science Journals Connector (OSTI)

...response to melanoma antigen in cancer patients. Of particular interest is the observation of Yee et al. (4). These investi gators have shown that tyrosinase-specific CD8+ CTL responses and CD4+ T-cell responses can be found in the same melanoma patients...

Ainhoa Pérez-Díez; Lisa H. Butterfield; Li Li; Nitya G. Chakraborty; James S. Economou; Bijay Mukherji

1998-12-01T23:59:59.000Z

404

Renewable Power Options for Electrical Generation on Kaua'i: Economics and Performance Modeling  

SciTech Connect (OSTI)

The Hawaii Clean Energy Initiative (HCEI) is working with a team led by the U.S. Department of Energy's (DOE) National Renewable Energy Laboratory (NREL) to assess the economic and technical feasibility of increasing the contribution of renewable energy in Hawaii. This part of the HCEI project focuses on working with Kaua'i Island Utility Cooperative (KIUC) to understand how to integrate higher levels of renewable energy into the electric power system of the island of Kaua'i. NREL partnered with KIUC to perform an economic and technical analysis and discussed how to model PV inverters in the electrical grid.

Burman, K.; Keller, J.; Kroposki, B.; Lilienthal, P.; Slaughter, R.; Glassmire, J.

2011-11-01T23:59:59.000Z

405

A 2DH nonlinear Boussinesq-type wave model of improved dispersion, shoaling, and wave generation characteristics  

Science Journals Connector (OSTI)

Abstract A modified Boussinesq-type model is derived to account for the propagation of either regular or irregular waves in two horizontal dimensions. An improvement of the dispersion and shoaling characteristics of the model is obtained by optimizing the coefficients of each term in the momentum equation, expanding in this way its applicability in very deep waters and thus overcoming a shortcoming of most models of the same type. The values of the coefficients are obtained by an inverse method in such a way as to satisfy exactly the dispersion relation in terms of both first and second-order analyses matching in parallel the associated shoaling gradient. Furthermore a physically more sound way to approach the evaluation of wave number in irregular wave fields is proposed. A modification of the wave generator boundary condition is also introduced in order to correctly simulate the phase celerity of each input wave component. The modified model is applied to simulate the propagation of breaking and non-breaking, regular and irregular, long and short crested waves in both one and two horizontal dimensions, in a variety of bottom profiles, such as of constant depth, mild slope, and in the presence of submerged obstacles. The simulations are compared with experimental data and analytical results, indicating very good agreement in most cases.

Michalis K. Chondros; Constantine D. Memos

2014-01-01T23:59:59.000Z

406

The Trucking Sector Optimization Model: A tool for predicting carrier and shipper responses to policies aiming to reduce GHG emissions  

Science Journals Connector (OSTI)

Abstract In response to the growing Climate Change problem, governments around the world are seeking to reduce the greenhouse gas (GHG) emissions of trucking. The Trucking Sector Optimization (TSO) model is introduced as a tool for studying the decisions that shippers and carriers make throughout time (focusing on investments in Fuel Saving Technologies), and for evaluating their impact on life-cycle GHG emissions. A case study of fuel taxation in California is used to highlight the importance of (1) modeling the trucking sector comprehensively, (2) modeling the dynamics of the stock of vehicles, and (3) modeling different sources of emissions.

Sebastian E. Guerrero; Samer M. Madanat; Robert C. Leachman

2013-01-01T23:59:59.000Z

407

Fuel Cell Power Model Version 2: Startup Guide, System Designs, and Case Studies. Modeling Electricity, Heat, and Hydrogen Generation from Fuel Cell-Based Distributed Energy Systems  

SciTech Connect (OSTI)

This guide helps users get started with the U.S. Department of Energy/National Renewable Energy Laboratory Fuel Cell Power (FCPower) Model Version 2, which is a Microsoft Excel workbook that analyzes the technical and economic aspects of high-temperature fuel cell-based distributed energy systems with the aim of providing consistent, transparent, comparable results. This type of energy system would provide onsite-generated heat and electricity to large end users such as hospitals and office complexes. The hydrogen produced could be used for fueling vehicles or stored for later conversion to electricity.

Steward, D.; Penev, M.; Saur, G.; Becker, W.; Zuboy, J.

2013-06-01T23:59:59.000Z

408

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

409

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

E-Print Network [OSTI]

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

Weismann, Martin; Panoiu, Nicolae C

2015-01-01T23:59:59.000Z

410

Partition wall subsystem modeling and effect on the coupled building system response  

E-Print Network [OSTI]

Building Design and Modeling baseline. 5.3 Building Design and Modeling Three reinforcedthe bare building (no wall), the modeling efforts neglected

Wood, Richard Lee

2012-01-01T23:59:59.000Z

411

Electronic responses of long chains to electrostatic fields: Hartree-Fock vs. density-functional theory: A model study  

SciTech Connect (OSTI)

The response to an electrostatic field is determined through simple model calculations, within both the restricted Hartree-Fock and density functional theory methods, for long, finite as well as infinite, periodic chains. The permanent dipole moment, ?{sub 0}, the polarizability, ?, and the hyperpolarizabilities ? and ?, calculated using a finite-field approach, are extensively analyzed. Our simple model allows for treatment of large systems and for separation of the properties into atomic and unit-cell contributions. That part of the response properties attributable to the terminations of the finite system change into delocalized current contributions in the corresponding infinite periodic system. Special emphasis is placed on analyzing the reasons behind the dramatic overestimation of the response properties found with density functional theory methods presently in common use.

Vargas, Jorge, E-mail: j.vargas@mx.uni-saarland.de [Physical and Theoretical Chemistry, University of Saarland, 66123 Saarbrücken (Germany)] [Physical and Theoretical Chemistry, University of Saarland, 66123 Saarbrücken (Germany); Springborg, Michael, E-mail: m.springborg@mx.uni-saarland.de [Physical and Theoretical Chemistry, University of Saarland, 66123 Saarbrücken (Germany) [Physical and Theoretical Chemistry, University of Saarland, 66123 Saarbrücken (Germany); School of Materials Science and Engineering, Tianjin University, Tianjin 300072 (China); Kirtman, Bernard [Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106 (United States)] [Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106 (United States)

2014-02-07T23:59:59.000Z

412

Simplified WECC modeling for frequency response, wind integration, and energy storage.  

E-Print Network [OSTI]

??The primary objective of a grid is to maintain a balance between generation and load. If these quantities are not in balance with each other,… (more)

Bhattacharji, Pranathi

2014-01-01T23:59:59.000Z

413

A Silicon Model of Auditory-Nerve Response Nonlinear signal processing is an integral part of sensory transduction in  

E-Print Network [OSTI]

, the auditory nerve. Humans can process sound input over a 120-dB dynamic range, yet the firing rate differences of the order of 10 µs, yet an auditory-nerve fiber can fire at most once per millisecond. Using and operation of an integrated circuit that models, to a limited degree, the evoked responses of the auditory

Lazzaro, John

414

Response of a climate model to tidal mixing parameterization under present day and last glacial maximum conditions  

E-Print Network [OSTI]

to examine the model's response to a vertical mixing scheme based on internal tide energy dissipation. The increase in internal tide energy flux caused by a $120 m reduction in sea level had the expected effect by sea level change was not related to alterations in the internal tide energy flux but rather

Jayne, Steven

415

Peatland carbon cycle responses to hydrological change at time scales from years to centuries: Impacts on model  

E-Print Network [OSTI]

Peatland carbon cycle responses to hydrological change at time scales from years to centuries: Impacts on model simulations and regional carbon budgets By Benjamin N. Sulman A dissertation submitted to the long-term storage of carbon in peat, these ecosystems contain a significant fraction of the global

Wisconsin at Madison, University of

416

Generation of non-local evolution loops and exchange operations for quantum control in three dimensional anisotropic Ising model  

E-Print Network [OSTI]

Control of quantum entanglement has been considered as elemental physical resource for quantum applications in Quantum Information and Quantum Computation. Control of entangled states on a couple of atoms, ions or quantum dots are milestones in almost all quantum applications towards a scalable spin-based quantum computers or quantum devices. For magnetic systems, Ising model is an interaction which generates and modi?es entanglement properties of quantum systems based on matter. In addition, when this interaction includes driven magnetic ?elds, it can be controlled to sustain, characterize or modify entanglement and other quantum properties. In this work, recent results about evolution in a general anisotropic three dimensional Ising model including an inhomogeneous magnetic ?eld is considered to obtain some general quantum control e?ects for their sustainability, programmed evolution or transformation: Evolution loops and Exchange operations. This control is achievable through a set of physical parameters, whose prescriptions are reported. The use of a non local basis in the model to express time evolution lets take advantage to describe and control the system, in particular with those issues associated with entanglement and operations mentioned before. Finally, some analysis about equivalent gates based on our development is made including an example with teleportation, using one of the gates constructed.

Francisco Delgado

2014-10-21T23:59:59.000Z

417

A Linear Discrete Dynamic System Model for Temporal Gene Interaction and Regulatory Network Influence in Response to Bioethanol Conversion Inhibitor HMF for Ethanologenic Yeast  

Science Journals Connector (OSTI)

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

Mingzhou (Joe) Song; Z. Lewis Liu

2007-01-01T23:59:59.000Z

418

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

419

Modeling, control, and power management of a power electrical system including two distributed generators based on fuel cell and supercapacitor  

Science Journals Connector (OSTI)

This paper focuses on Distributed Generator (DG) integration in Power Electrical System (PES) for dispersed nodes. The main objective of the DG use can be classified into two aspects: a load following service and ancillary service systems. In this study the DG system contains a Fuel cell and a Supercapacitor storage device. A gas turbine system is modeled in order to estimate the PES frequency behavior under a variable power demand. The main goal of this work is to develop a DG control strategy with the aim to smooth the frequency and the voltage peak variations. To assess the different management stages the power flow exchanged between DGs and PES is depicted and discussed for different power demand variations. The results found with the DGs integration strategy confirm the frequency and voltage regulations and also prove the well power flow management.

L. Krichen

2013-01-01T23:59:59.000Z

420

Modeling demand response and economic impact of advanced and smart metering  

Science Journals Connector (OSTI)

Advanced metering constitutes an essential component of communications between electricity suppliers and consumers. It may be possible to augment demand response by coupling Advanced Metering Infrastructure (AMI)...

Praneeth Aketi; Suvrajeet Sen

2014-09-01T23:59:59.000Z

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


421

Current generation by helicons and lower hybrid waves in modern tokamaks and reactors ITER and DEMO. Scenarios, modeling and antennae  

SciTech Connect (OSTI)

The innovative concept and 3D full-wave code modeling the off-axis current drive by radio-frequency (RF) waves in large-scale tokamaks, ITER and DEMO, for steady-state operation with high efficiency is proposed. The scheme uses the helicon radiation (fast magnetosonic waves at high (20-40) ion cyclotron frequency harmonics) at frequencies of 500-700 MHz propagating in the outer regions of the plasmas with a rotational transform. It is expected that the current generated by helicons, in conjunction with the bootstrap current, ensure the maintenance of a given value of the total current in the stability margin q(0) {>=} 2 and q(a) {>=} 4, and will help to have regimes with a negative magnetic shear and internal transport barrier to ensure stability at high normalized plasma pressure {beta}{sub N} > 3 (the so-called advanced scenarios) of interest for the commercial reactor. Modeling with full-wave three-dimensional codes PSTELION and STELEC showed flexible control of the current profile in the reactor plasmas of ITER and DEMO, using multiple frequencies, the positions of the antennae and toroidal wave slow down. Also presented are the results of simulations of current generation by helicons in the DIII-D, T-15MD, and JT-60AS tokamaks. Commercially available continuous-wave klystrons of the MW/tube range are promising for commercial stationary fusion reactors. The compact antennae of the waveguide type are proposed, and an example of a possible RF system for today's tokamaks is given. The advantages of the scheme (partially tested at lower frequencies in tokamaks) are a significant decline in the role of parametric instabilities in the plasma periphery, the use of electrically strong resonator-waveguide type antennae, and substantially greater antenna-plasma coupling.

Vdovin, V. L., E-mail: vdov@nfi.kiae.ru [National Research Centre 'Kurchatov Institute,' (Russian Federation)

2013-02-15T23:59:59.000Z

422

An advanced model for the prediction of the total burnup-dependent self-powered rhodium detector response  

SciTech Connect (OSTI)

This paper presents an advanced method to generate the burnup dependent total response of a rhodium self-powered detector operating in a pressurized water reactor environment. Full use is made of advanced nodal neutronic and coupled electron-photon transport techniques. The method accounts for (1) the detailed energy and spatial dependence of the neutron activation of each detector segment in a three-dimensional representation, (2) the generation of electrons caused by both neutron and gamma interactions in all the geometrical regions of the detector, and (3) the transport of the electrons within the detector to provide an observable current. All components of the detector signal are directly calculated - the method does not require the use of any empirical data, such as detector sensitivities. Intermediate results, such as beta escape fractions, were compared to measured data, and the overall technique was extensively benchmarked against operating data from three reactors.

Ober, T.G. [Entergy Operations, Inc., Jackson, MS (United States); Malloy, J.W. [Tetra Engineering Group, Simsbury, CT (United States)

1995-12-31T23:59:59.000Z

423

What causes the excessive response of clear-sky greenhouse effect to El Nin~o warming in Community Atmosphere Models?  

E-Print Network [OSTI]

What causes the excessive response of clear-sky greenhouse effect to El Nin~o warming in Community-sky greenhouse effect to El Nin~o warming in the Community Atmosphere Models (CAMs), the response of both water in the lapse rate response to the discrepancies seen in the clear-sky greenhouse effect. The results confirm

Sun, Dezheng

424

Mechanics of torque generation in the bacterial flagellar motor  

E-Print Network [OSTI]

The bacterial flagellar motor (BFM) is responsible for driving bacterial locomotion and chemotaxis, fundamental processes in pathogenesis and biofilm formation. In the BFM, torque is generated at the interface between transmembrane proteins (stators) and a rotor. It is well-established that the passage of ions down a transmembrane gradient through the stator complex provides the energy needed for torque generation. However, the physics involved in this energy conversion remain poorly understood. Here we propose a mechanically specific model for torque generation in the BFM. In particular, we identify two fundamental forces involved in torque generation: electrostatic and steric. We propose that electrostatic forces serve to position the stator, while steric forces comprise the actual 'power stroke'. Specifically, we predict that ion-induced conformational changes about a proline 'hinge' residue in an $\\alpha$-helix of the stator are directly responsible for generating the power stroke. Our model predictions f...

Mandadapu, Kranthi K; Berry, Richard M; Oster, George

2015-01-01T23:59:59.000Z

425

Optimization modelling of the impacts of a Severn Barrage for a two-way generation scheme using a Continental Shelf model  

Science Journals Connector (OSTI)

Abstract The Severn Estuary has the world's second largest tide range and a barrage across the estuary, located just seawards of Cardiff in Wales and Weston in the South West England, has been proposed for over half a century, with the objective of extracting large amounts of tidal energy. A Severn Barrage, as previously proposed by the Severn Tidal Power Group (STPG), would be the largest renewable energy project for tidal power generation in the world, if built as proposed, and would generate approximately 5% of the UK's electricity needs. However, concerns have been raised over the environmental impacts of such a barrage, including potential increase in flood risk, loss of intertidal habitats etc. In addressing the challenges of maximizing the energy output and minimizing the environmental impacts of such a barrage, this research study has focused on using a Continental Shelf model, based on the modified Environmental Fluid Dynamics Code (EFDC) with a barrage operation module (EFDC_B), to investigate both the far and near field hydrodynamic impacts of a barrage for different operating scenarios. Three scenarios have been considered to simulate the Severn Barrage, operating via two-way generation and using different combinations of turbines and sluices. The first scenario consisted of 216 turbines and 166 sluices installed along the barrage; the second consisted of 382 turbines with no sluices; and the third consisted of 764 turbines and no sluices. The specification of the sluice gates and turbines are the same for all scenarios. The model results indicate that the third scenario has the best mitigating effects for the far-field and near-field flood risks caused by a barrage and produces the most similar results of minimum water depth and maximum velocity distributions to those obtained from simulating the natural conditions of the estuary, i.e. the current conditions. The results also show that the flow patterns around the barrage are closest to those for the existing natural conditions with minimal slight changes in the estuary. Thus, the results clearly indicate that the environmental impacts of a Severn Barrage can be minimized if the barrage is operated for two-way generation and under the third scenario. Although it appears that the energy output for the third scenario is less than that obtained for the other two scenarios, if very low head (VLH) turbines are used, then the third scenario could generate more energy as more turbines could be cited along the barrage structure. Therefore, the study shows that a Severn Barrage, operating in two-way generation and with 764 turbines (ideally VLH turbines), would be the best option to meet the needs of maximizing the energy output, but having a minimal impact on environmental changes in the estuary and far-field.

Juntao Zhou; Shunqi Pan; Roger A. Falconer

2014-01-01T23:59:59.000Z

426

Transient response of the Hadley Centre coupled ocean-atmosphere model to increasing carbon dioxide. Part II: Spatial and temporal structure of response  

SciTech Connect (OSTI)

A high-resolution (2.75{degrees} lat x 3.75{degrees} long) coupled ocean-atmosphere model has been used to simulate the transient response of climate to a gradual increase in atmospheric carbon dioxide concentrations. Although the radiative forcing increases linearly, there is a delay of about 30 yr before the ocean warms appreciably. This {open_quotes}cold start{close_quotes} is, at least partly, an artifact of the experimental design. At the time of doubling (after 70 yr), the patterns of change are similar to those found in comparable studies of the equilibrium response, except in the high latitudes of the Southern Ocean and the North Atlantic, where the warming is considerably reduced. The mechanisms leading to this reduction are discussed. After two to three decades, the pattern of warming is well established. The warming over land is substantially larger than that over the sea, with a consequent lowering of surface pressure over the northern continents in summer. The patterns of changes in precipitation and soil moisture take longer to establish themselves, although locally there are consistent changes after the third decade. 55 refs., 30 figs., 6 tabs.

Murphy, J.M.; Mitchell, J.F.B. [Hadley Centre for Climate Prediction and Research, Berkshire (United Kingdom)] [Hadley Centre for Climate Prediction and Research, Berkshire (United Kingdom)

1995-01-01T23:59:59.000Z

427

Demand response based congestion management in a mix of pool and bilateral electricity market model  

Science Journals Connector (OSTI)

The independent system operator (ISO) is a key element in the deregulated structure with one of the responsibilities of transmission congestion management (CM). The ISO opts market based solutions to manage conge...

Ashwani Kumar; Charan Sekhar

2012-06-01T23:59:59.000Z

428

Nanoparticle Targeting of Anticancer Drug Improves Therapeutic Response in Animal Model of Human Epithelial Cancer  

Science Journals Connector (OSTI)

...Molecular Targets, and Chemical Biology Nanoparticle Targeting of Anticancer Drug Improves...14263. Prior studies suggested that nanoparticle drug delivery might improve the therapeutic...responses not possible with a free drug. Nanoparticle|drug delivery|PAMAM dendrimer...

Jolanta F. Kukowska-Latallo; Kimberly A. Candido; Zhengyi Cao; Shraddha S. Nigavekar; Istvan J. Majoros; Thommey P. Thomas; Lajos P. Balogh; Mohamed K. Khan; James R. Baker, Jr.

2005-06-15T23:59:59.000Z

429

Modelling Syngas Generation  

Science Journals Connector (OSTI)

Gasification can be defined as the partial combustion of organic matter, with oxygen, air...gasifying agents..., thus less oxygen is used than that required for the raw material complete combustion

Mar Pérez-Fortes; Aarón D. Bojarski

2011-01-01T23:59:59.000Z

430

Spectral reflectance and responsivity of Ge- and InGaAs-photodiodes in the near-infrared: measurement and model  

SciTech Connect (OSTI)

The spectral reflectance and responsivity of Ge- and InGaAs-photodiodes at (nearly) normal and oblique incidence (45 degree sign ) were investigated. The derived data allow a calculation of the photodiodes responsivities for any incident angle. The measurements were carried out with s-and p-polarized radiation in the wavelength range from 1260 to1640 nm. The spectral reflectance of the photodiodes was modeled by using the matrix approach developed for thin-film optical assemblies. The comparison between the calculated and measured reflectance shows a difference of less than 2% for the Ge-photodiode. For the InGaAs-photodiode, the differences between measured and calculated reflectance are larger, i.e., up to 6% for wavelengths between 1380 and1580 nm. Despite the larger differences between calculated and measured spectral reflectances for the InGaAs-photodiode, the difference between calculated and measured spectral responsivity is even smaller for the InGaAs-photodiode than for the Ge-photodiode, i.e.,?1.2% for the InGaAs-photodiode compared to?2.2% for the Ge-photodiode. This is because the difference in responsivity is strongly correlated to the absolute spectral reflectance level, which is much lower for the InGaAs-photodiode. This observation also shows the importance of having small reflectances, i.e.,appropriate antireflection coatings for the photodiodes. The relative standard uncertainty associated with the modeled spectral responsivity is about 2.2% for the Ge-photodiode and about 1.2% for the InGaAs-photodiode for any incident angle over the whole spectral range measured. The data obtained for the photodiodes allow the calculation of the spectral responsivity of Ge- and InGaAs-trap detectors and the comparison with experimental results.

Lopez, M.; Hofer, H.; Stock, K. D.; Bermudez, J. C.; Schirmacher, A.; Schneck, F.; Kueck, S

2007-10-10T23:59:59.000Z

431

Diophantine Generation,  

E-Print Network [OSTI]

Diophantine Generation, Horizontal and Vertical Problems, and the Weak Vertical Method Alexandra Shlapentokh Diophantine Sets, Definitions and Generation Diophantine Sets Diophantine Generation Properties of Diophantine Generation Diophantine Family of Z Diophantine Family of a Polynomial Ring Going Down Horizontal

Shlapentokh, Alexandra

432

Modeling and Control System Design for an Integrated Solar Generation and Energy Storage System with a Ride-Through Capability: Preprint  

SciTech Connect (OSTI)

This paper presents a generic approach for PV panel modeling. Data for this modeling can be easily obtained from manufacturer datasheet, which provides a convenient way for the researchers and engineers to investigate the PV integration issues. A two-stage power conversion system (PCS) is adopted in this paper for the PV generation system and a Battery Energy Storage System (BESS) can be connected to the dc-link through a bi-directional dc/dc converter. In this way, the BESS can provide some ancillary services which may be required in the high penetration PV generation scenario. In this paper, the fault ride-through (FRT) capability is specifically focused. The integrated BESS and PV generation system together with the associated control systems is modeled in PSCAD and Matlab platforms and the effectiveness of the controller is validated by the simulation results.

Wang, X.; Yue, M.; Muljadi, E.

2012-09-01T23:59:59.000Z

433

Modified fish-bone model: A simplified MDOF model for simulation of seismic responses of moment resisting frames  

Science Journals Connector (OSTI)

Abstract This paper presents a simplified Multi-Degree-Of-Freedom (MDOF) model through modification of fish-bone model (or generic frame). Modified Fish-Bone (MFB) model is developed through three enhancements: (i) the moment of inertia for half-beams is reduced slightly to modify the assumption of equal rotation at each story joints, (ii) a number of truss elements are inserted to the fish-bone model to simulate flexural deformation of moment frames due to axial elongation and contraction of columns, and (iii) moment–rotation relationship of representative rotational springs is supposed to be bilinear instead of trilinear in order to consider simultaneous yielding at both ends of the beam in moment frames. The proposed model is evaluated with respect to nonlinear dynamic analysis results of three classic moment resisting frames subjected to 94 records of FEMA-440 ground motion data set. Moreover, the adequacy of this model is compared with the fish-bone model and two predictors of nonlinear seismic demand. The statistical study of predicted interstory drift demonstrates the superiority of the proposed model over the fish-bone model and both seismic demand predictors.

A.R. Khaloo; H. Khosravi

2013-01-01T23:59:59.000Z

434

Northern Hemispheric cryosphere response to volcanic eruptions in the Paleoclimate Modeling Intercomparison Project 3 last  

E-Print Network [OSTI]

(PMIP3) project to determine whether current state-of-the-art models produce sudden changes it is not sustained beyond a decade. Sea ice expansion in the North Atlantic is seen in some PMIP3 models after large eruptions, although none of these models produce significant centennial-scale effects. Warm Baffin Island

Robock, Alan

435

A multiple objective decision making model for energy generation portfolio under fuzzy uncertainty: Case study of large scale investor-owned utilities in Florida  

Science Journals Connector (OSTI)

Abstract The objective of this paper is to present a methodology to evaluate the viability of developing solar photovoltaic projects for large investor-owned utilities. By taking into account the trade-off between the cost per kWh of electricity generation and total risk for an investor-owned utility, a multi-objective model of the energy generation portfolios is developed. The decision making model can determine the proportion of different energy generation sources in an investor-owned utility portfolio that reduces risk while providing the lowest cost per kWh of electricity generation possible. In order to measure the risk of the investor-owned utility for energy portfolio selection, an investigation of possible dangers and failures of energy generation portfolios is made and 9 main failure modes are identified. The failure mode and effects analysis is employed to calculate the risk priority numbers for each risk. To deal with the uncertainties of the levelized cost of electricity and risk levels of failure modes, the fuzzy method is introduced and an equivalent crisp model is derived which is then solved by employing a multiple objective particle swarm optimization algorithm. The analysis for four large scale investor-owned utilities in Florida is presented to highlight the performance of the developed optimization method.

Ziqiang Zeng; Ehsan Nasri; Abdol Chini; Robert Ries; Jiuping Xu

2015-01-01T23:59:59.000Z

436

Forward Modeling of the Induction Log Response of a Fractured Geologic Formation  

E-Print Network [OSTI]

3.1 Layered Earth Model The environment used for the induction log simulations is a layered Earth model. The model consists of six layers that are assigned different thicknesses and conductivities based on the desired induction log... Tx-Rx pair has a fixed separation and is moved along a vertical profile through the subsurface taking measurements at predetermined logging points. 20 The second change to the original Seatem code involves the surrounding environment. The code...

Bray, Steven Hunter

2013-05-02T23:59:59.000Z

437

JMP for Model Selection In order to build a model using JMP you will use the Fit Model platform. The response  

E-Print Network [OSTI]

JMP for Model Selection In order to build a model using JMP you will use the Fit Model platform Model Effects. The Personality of the model should be changed from Standardized Least Squares to Stepwise. Then click on Run Model. The Stopping Rule: should be changed to P-value Threshold. The Prob

Carriquiry, Alicia

438

Ann. N.Y. Acad. Sci. 956: 537542 (2002). 2002 New York Academy of Sciences. A Three-Channel Model for Generating the  

E-Print Network [OSTI]

-Channel Model for Generating the Vestibulo-Ocular Reflex in Each Eye LAURENCE R. HARRIS,a KARL A. BEYKIRCH velocity ranges,7 as dis- cussed elsewhere.8 Address for correspondence: Laurence R. Harris, Department of Psychology, York Univer- sity, 4700 Keele Street, Toronto, Ontario M3J 1P3, Canada. Voice: 416-736-2100, ext

Harris, Laurence R.

439

Modeling and Analysis of Price-Responsive Loads in the Operation of Smart Grids.  

E-Print Network [OSTI]

??In this thesis, a demand elasticity model is developed and tested for the dispatch of high voltage power systems and microgrids. The price obtained from… (more)

Ramos-Gaete, Felipe

2013-01-01T23:59:59.000Z

440

ResPoNSe: modeling the wide variability of residential energy consumption.  

E-Print Network [OSTI]

affect appliance energy consumption. For example, differentStates, 2005 Residential Energy Consumption Survey: HousingModeling of End-Use Energy Consumption in the Residential

Peffer, Therese; Burke, William; Auslander, David

2010-01-01T23:59:59.000Z

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


441

Generating Structurally Complex Test Cases by Data Mutation: A Case Study of Testing an Automated Modelling Tool  

E-Print Network [OSTI]

- 1 - Generating Structurally Complex Test Cases by Data Mutation: A Case Study of Testing Brookes University, Oxford OX33 1HX, UK Email: hzhu@brookes.ac.uk ABSTRACT Generation of adequate test cases is difficult and expensive, especially for testing software systems whose input is structurally

Zhu, Hong

442

Comparison of Demand Response Performance with an EnergyPlus Model in a Low Energy Campus Building  

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

4E 4E Comparison of Demand Response Performance with an EnergyPlus Model in a Low Energy Campus Building J.H. Dudley, D. Black, M. Apte, M.A. Piette Lawrence Berkeley National Laboratory P. Berkeley University of California, Berkeley May 2010 Presented at the 2010 ACEEE Summer Study on Energy Efficiency in Buildings, Pacific Grove, CA, August 15-20, 2010, and published in the Proceedings DISCLAIMER This document was prepared as an account of work sponsored by the United States Government. While this document is believed to contain correct information, neither the United States Government nor any agency thereof, nor The Regents of the University of California, nor any of their employees, makes any warranty, express or implied, or assumes any legal responsibility for the accuracy, completeness, or usefulness of any information,

443

Improvements in fast-response flood modeling: desktop parallel computing and domain tracking  

SciTech Connect (OSTI)

It is becoming increasingly important to have the ability to accurately forecast flooding, as flooding accounts for the most losses due to natural disasters in the world and the United States. Flood inundation modeling has been dominated by one-dimensional approaches. These models are computationally efficient and are considered by many engineers to produce reasonably accurate water surface profiles. However, because the profiles estimated in these models must be superimposed on digital elevation data to create a two-dimensional map, the result may be sensitive to the ability of the elevation data to capture relevant features (e.g. dikes/levees, roads, walls, etc...). Moreover, one-dimensional models do not explicitly represent the complex flow processes present in floodplains and urban environments and because two-dimensional models based on the shallow water equations have significantly greater ability to determine flow velocity and direction, the National Research Council (NRC) has recommended that two-dimensional models be used over one-dimensional models for flood inundation studies. This paper has shown that two-dimensional flood modeling computational time can be greatly reduced through the use of Java multithreading on multi-core computers which effectively provides a means for parallel computing on a desktop computer. In addition, this paper has shown that when desktop parallel computing is coupled with a domain tracking algorithm, significant computation time can be eliminated when computations are completed only on inundated cells. The drastic reduction in computational time shown here enhances the ability of two-dimensional flood inundation models to be used as a near-real time flood forecasting tool, engineering, design tool, or planning tool. Perhaps even of greater significance, the reduction in computation time makes the incorporation of risk and uncertainty/ensemble forecasting more feasible for flood inundation modeling (NRC 2000; Sayers et al. 2000).

Judi, David R [Los Alamos National Laboratory; Mcpherson, Timothy N [Los Alamos National Laboratory; Burian, Steven J [UNIV. OF UTAH

2009-01-01T23:59:59.000Z

444

Integration of a sludge deposition model into the ATHOS3 computer program and application to a sample U-tube steam generator  

SciTech Connect (OSTI)

This study pursues a approach to sludge deposition prediction, similar to that published by Keefer, et al.. Starting with the same basic model as Beal and Chen, Keefer, et al. made several simplifying assumptions so that a closed form solution to the equations describing deposition and reentrainment could be obtained. Using a similar approach, this study shows how the physics of the sludge model can be integrated directly into a steady-state thermal-hydraulic analysis computer program such as ATHOS3 to provide an estimate of the relative amounts of sludge expected to accumulate in various regions of a steam generator. This allows sludge deposition and reentrainment rates (i.e. rate coefficients) to be calculated at every node used to model the steam generator (which can be many thousands), so that sludge deposition patterns can readily be examined along with thermal-hydraulic parameters.

Keeton, L.W.; Keefer, R.H.; Clark, P.R.

1993-11-01T23:59:59.000Z

445

Eastern Frequency Response Study  

SciTech Connect (OSTI)

This study was specifically designed to investigate the frequency response of the Eastern Interconnection that results from large loss-of-generation events of the type targeted by the North American Electric Reliability Corp. Standard BAL-003 Frequency Response and Frequency Bias Setting (NERC 2012a), under possible future system conditions with high levels of wind generation.

Miller, N.W.; Shao, M.; Pajic, S.; D'Aquila, R.

2013-05-01T23:59:59.000Z

446

The tropical precipitation response to Andes topography and ocean heat fluxes in an aquaplanet model  

Science Journals Connector (OSTI)

This aquaplanet modeling study using AM2.1 examines how ocean energy transport and topography influence the location of tropical precipitation. Adding realistic Andes topography regionally displaces tropical rainfall from the equator into the ...

Elizabeth A. Maroon; Dargan M. W. Frierson; David S. Battisti

447

Utilization of the E?-Myc Mouse to Model Heterogeneity of Therapeutic Response  

Science Journals Connector (OSTI)

...model, and establishes a framework to test novel targeted therapies or combination...two clusters using the Wilcoxon rank sum test and Bonferonni correction (q value 0...Significance determined by the log-rank test. Moving beyond descriptive analyses...

Rachel E. Rempel; Xiaolei Jiang; Paul Fullerton; Tuan Zea Tan; Jieru Ye; Jieying Amelia Lau; Seiichi Mori; Jen-Tsan Chi; Joseph R. Nevins; Daphne R. Friedman

2014-12-01T23:59:59.000Z

448

1. Generation 1 1. Generation  

E-Print Network [OSTI]

1. Generation 1 _________________________________________________________________________ 1. Generation Sound and vibrations or, in more general terms, oscillations of matter (solids or fluids) are generated in many different dynamic processes. The basic mechanisms which underlie these oscillations

Berlin,Technische Universität

449

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

Science Journals Connector (OSTI)

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

Jin-Song von Storch; Hideharu Sasaki; Jochem Marotzke

2007-03-01T23:59:59.000Z

450

Hydrodynamic Analysis of a Three-Fluidized Bed Reactor Cold Flow Model for Chemical Looping Hydrogen Generation: Pressure Characteristics  

Science Journals Connector (OSTI)

Chemical looping hydrogen generation (CLHG) can produce pure hydrogen with inherent separation of CO2 from fossils fuel. The process involves a metal oxide, as an oxygen carrier, such as iron oxide. The CLHG syst...

Zhipeng Xue; Wenguo Xiang; Shiyi Chen…

2013-01-01T23:59:59.000Z

451

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

Science Journals Connector (OSTI)

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

J. M. Murphy

1995-01-01T23:59:59.000Z

452

Seismic response analyses of high-speed railway bridge round-ended piers using global bridge model  

Science Journals Connector (OSTI)

The non-linear failure occur in pier bottom which may cause the collapse or damage of bridge under high-level earthquake, lots of researchers have been paying more and more attention to the seismic behaviour of high-speed railway bridge piers with the development of high-speed railway. The seismic responses of high-speed railway round-ended piers are investigated in this paper. The global finite element model of the multi-span bridge simply supported bridge is set up under earthquake action, the round-ended piers are taken into account as part of whole bridge, by means of finite element software and moment-curvature relationship programme, the seismic responses of bridge piers are calculated under the different earthquake action combination, pier height and vehicle speed. Calculation results show that the seismic responses will increase with increment of speed of vehicles, pier height and seismic intensity, the elastic-plastic deformation will occur at the pier bottom under high-level earthquake action, and some measures such as lateral reinforced steel encryption should be taken into account to ensure safety.

Lingkun Chen; Lizhong Jiang; Peng Liu

2012-01-01T23:59:59.000Z

453

Diagnostics for near-surface wind response to the Gulf Stream in a regional atmospheric model  

Science Journals Connector (OSTI)

The mechanisms acting on near-surface winds over the Gulf Stream are diagnosed using 5-year outputs of a regional atmospheric model. The diagnostics for the surface-layer momentum vector, its curl, and its convergence are developed with a clear ...

Kohei Takatama; Shoshiro Minobe; Masaru Inatsu; R. Justin Small

454

Mathematical models of the transitions between endocrine therapy responsive and resistant states in breast cancer  

Science Journals Connector (OSTI)

...differential equations (SDEs) to...white noise process with where...the precise equations of the model...used for our simulations. In deriving...We used Matlab (v. 7...transition rate matrix. The off-diagonal...estimated by equation (2.9...Monte Carlo simulations, as functions...

2014-01-01T23:59:59.000Z

455

NEUROMOTOR RESPONSE TO WHOLE BODY VIBRATION TRANSMISSIBILITY IN THE HORIZONTAL DIRECTION AND ITS MATHEMATICAL MODEL  

E-Print Network [OSTI]

Recent studies of whole body vibration in seated postures have suggested that the neuromotor system may play a role in the etiology of low back disorders. A number of researchers have modeled whole body vibration transmission to the low back, spine...

Hanumanthareddygari, Vinay

2010-09-02T23:59:59.000Z

456

Distributions: generators of observations What about reality?  

E-Print Network [OSTI]

Distributions: generators of observations What about reality? An example: homeopathy Conclusion Models, Estimation and Reality #12;Distributions: generators of observations What about reality? An example: homeopathy Conclusion 1. Distributions: generators of observations Statistical modelling is based

Hennig, Christian

457

Modeling surfaces in the context of pulsed-power : work functions, electron emission and dynamic response.  

SciTech Connect (OSTI)

The ability to quickly understand and deal with issues on ZR, or to virtually design a future ZX accelerator, requires a physics-based capability to simulate all key pulsed power components. Highly important for gas switches and transmission lines are surface phenomena: thermionic emission, photoemission, field emission, and ion-surface dynamics. These are complex processes even at normal conditions, when coupled to the dynamic environment in pulsed power components, the current state of the art of understanding is not at the level of science based predictive modeling. Modeling efforts at the macroscopic level (finite element based hydrodynamic simulations) require detailed information of these processes to yield more reliable results. This is the final report of an LDRD project in the science of extreme environments investment area; the project was focused on describing the physics of surfaces of materials of interest in pulsed-power components. We have calculated the temperature dependence of work functions for metals from first principles using density functional theory (DFT) as well as investigated the effect of initial oxidation and alloying. By using the GW method, we have gone beyond DFT to calculate work functions for Al. The GW work required base-lining the GW results for different systems, since GW lacks a description of total energy. Lastly, we investigated the more macroscopic physics of how a surface and bulk material responds to a very high current under a short time, representative for current loads in pulsed-power components, with emphasis on materials modeling. These simulations were made using two hydrodynamic codes, ALEGRA and MACH2, in order to focus on the materials models themselves.

Cochrane, Kyle Robert (Ktech Corporation, Albuquerque, NM); Chantrenne, Sophie (SAIC, Albuquerque, NM); Mattsson, Thomas Kjell Rene; Faleev, Sergey V. (SNAMI Inc., AL)

2009-09-01T23:59:59.000Z

458

Distributed Generation  

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

Untapped Value of Backup Generation Untapped Value of Backup Generation While new guidelines and regulations such as IEEE (Institute of Electrical and Electronics Engineers) 1547 have come a long way in addressing interconnection standards for distributed generation, utilities have largely overlooked the untapped potential of these resources. Under certain conditions, these units (primarily backup generators) represent a significant source of power that can deliver utility services at lower costs than traditional centralized solutions. These backup generators exist today in large numbers and provide utilities with another option to reduce peak load, relieve transmission congestion, and improve power reliability. Backup generation is widely deployed across the United States. Carnegie Mellon's Electricity

459

Is there a P-wave bound state of W sub L W sub L On the dynamical generation of a. rho. meson in the. sigma. model  

SciTech Connect (OSTI)

We investigate the possibility that the Higgs lagrangian predicts the existence of a P-wave W{sub L}W{sub L} resonance. This problem is equivalent to studying the formation of the {rho} meson by the dynamics contained in the {sigma} model. Using the Pade approximation, Basdevant and Lee had claimed that {rho} is generated dynamically. We show that their result, while computationally correct, is not significant, because of the position of the Landau ghost. For the same reason, a W{sub L}W{sub L} P-wave resonance below 2 TeV is not expected, unless the standard model is violated. 10 refs., 8 figs.

Atkinson, D. (Fermi National Accelerator Lab., Batavia, IL (United States) Institute for Theoretical Physics, Groningen, The Netherlands (NL)); Harada, M. (Nagoya Univ. (Japan). Dept. of Physics); Sanda, A.I. (Superconducting Super Collider Lab., Dallas, TX (United States) Rockefeller Univ., New York, NY (United States). Dept. of Physics)

1991-10-01T23:59:59.000Z

460

Development and validation of transgene constructs in order to generate bi-transgenic mice models for Diabetic Peripheral Neuropathy research  

E-Print Network [OSTI]

the control of the SC-specific promoter for 2', 3'-cyclic nucleotide 3'-phosphodiesterase. Placement of genes under the control of the rtTA- Ptight system has been shown to display excellent dose-response characteristics, which allows not only a qualitative...

Nair, Lakshmy

2010-04-09T23:59:59.000Z

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


461

Wind power generating system  

SciTech Connect (OSTI)

Normally feathered propeller blades of a wind power generating system unfeather in response to the actuation of a power cylinder that responds to actuating signals. Once operational, the propellers generate power over a large range of wind velocities. A maximum power generation design point signals a feather response of the propellers so that once the design point is reached no increase in power results, but the system still generates power. At wind speeds below this maximum point, propeller speed and power output optimize to preset values. The propellers drive a positive displacement pump that in turn drives a positive displacement motor of the swash plate type. The displacement of the motor varies depending on the load on the system, with increasing displacement resulting in increasing propeller speeds, and the converse. In the event of dangerous but not clandestine problems developing in the system, a control circuit dumps hydraulic pressure from the unfeathering cylinder resulting in a predetermined, lower operating pressure produced by the pump. In the event that a problem of potentially cladestine consequence arises, the propeller unfeathering cylinder immediately unloads. Upon startup, a bypass around the motor is blocked, applying a pressure across the motor. The motor drives the generator until the generator reaches a predetermined speed whereupon the generator is placed in circuit with a utility grid and permitted to motor up to synchronous speed.

Schachle, Ch.; Schachle, E. C.; Schachle, J. R.; Schachle, P. J.

1985-03-12T23:59:59.000Z

462

Estimating Demand Response Load Impacts: Evaluation of BaselineLoad Models for Non-Residential Buildings in California  

SciTech Connect (OSTI)

Both Federal and California state policymakers areincreasingly interested in developing more standardized and consistentapproaches to estimate and verify the load impacts of demand responseprograms and dynamic pricing tariffs. This study describes a statisticalanalysis of the performance of different models used to calculate thebaseline electric load for commercial buildings participating in ademand-response (DR) program, with emphasis onthe importance of weathereffects. During a DR event, a variety of adjustments may be made tobuilding operation, with the goal of reducing the building peak electricload. In order to determine the actual peak load reduction, an estimateof what the load would have been on the day of the event without any DRactions is needed. This baseline load profile (BLP) is key to accuratelyassessing the load impacts from event-based DR programs and may alsoimpact payment settlements for certain types of DR programs. We testedseven baseline models on a sample of 33 buildings located in California.These models can be loosely categorized into two groups: (1) averagingmethods, which use some linear combination of hourly load values fromprevious days to predict the load on the event, and (2) explicit weathermodels, which use a formula based on local hourly temperature to predictthe load. The models were tested both with and without morningadjustments, which use data from the day of the event to adjust theestimated BLP up or down.Key findings from this study are: - The accuracyof the BLP model currently used by California utilities to estimate loadreductions in several DR programs (i.e., hourly usage in highest 3 out of10 previous days) could be improved substantially if a morning adjustmentfactor were applied for weather-sensitive commercial and institutionalbuildings. - Applying a morning adjustment factor significantly reducesthe bias and improves the accuracy of all BLP models examined in oursample of buildings. - For buildings with low load variability, all BLPmodels perform reasonably well in accuracy. - For customer accounts withhighly variable loads, we found that no BLP model produced satisfactoryresults, although averaging methods perform best in accuracy (but notbias). These types of customers are difficult to characterize withstandard BLP models that rely on historic loads and weather data.Implications of these results for DR program administrators andpolicymakersare: - Most DR programs apply similar DR BLP methods tocommercial and industrial sector customers. The results of our study whencombined with other recent studies (Quantum 2004 and 2006, Buege et al.,2006) suggests that DR program administrators should have flexibility andmultiple options for suggesting the most appropriate BLP method forspecific types of customers.

Coughlin, Katie; Piette, Mary Ann; Goldman, Charles; Kiliccote,Sila

2008-01-01T23:59:59.000Z

463

Modeling of Oceanic Gas Hydrate Instability and Methane Release in Response to Climate Change  

SciTech Connect (OSTI)

Paleooceanographic evidence has been used to postulate that methane from oceanic hydrates may have had a significant role in regulating global climate, implicating global oceanic deposits of methane gas hydrate as the main culprit in instances of rapid climate change that have occurred in the past. However, the behavior of contemporary oceanic methane hydrate deposits subjected to rapid temperature changes, like those predicted under future climate change scenarios, is poorly understood. To determine the fate of the carbon stored in these hydrates, we performed simulations of oceanic gas hydrate accumulations subjected to temperature changes at the seafloor and assessed the potential for methane release into the ocean. Our modeling analysis considered the properties of benthic sediments, the saturation and distribution of the hydrates, the ocean depth, the initial seafloor temperature, and for the first time, estimated the effect of benthic biogeochemical activity. The results show that shallow deposits--such as those found in arctic regions or in the Gulf of Mexico--can undergo rapid dissociation and produce significant methane fluxes of 2 to 13 mol/yr/m{sup 2} over a period of decades, and release up to 1,100 mol of methane per m{sup 2} of seafloor in a century. These fluxes may exceed the ability of the seafloor environment (via anaerobic oxidation of methane) to consume the released methane or sequester the carbon. These results will provide a source term to regional or global climate models in order to assess the coupling of gas hydrate deposits to changes in the global climate.

Reagan, Matthew; Reagan, Matthew T.; Moridis, George J.

2008-04-15T23:59:59.000Z

464

Generation Planning (pbl/generation)  

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

Generation Hydro Power Wind Power Monthly GSP BPA White Book Dry Year Tools Firstgov Generation Planning Thumbnail image of BPA White Book BPA White Book (1998 - 2011) Draft Dry...

465

Modeling and Field Test Planning Activities in Support of Disposal of Heat-Generating Waste in Salt  

SciTech Connect (OSTI)

The modeling efforts in support of the field test planning conducted at LBNL leverage on recent developments of tools for modeling coupled thermal-hydrological-mechanical-chemical (THMC) processes in salt and their effect on brine migration at high temperatures. This work includes development related to, and implementation of, essential capabilities, as well as testing the model against relevant information and published experimental data related to the fate and transport of water. These are modeling capabilities that will be suitable for assisting in the design of field experiment, especially related to multiphase flow processes coupled with mechanical deformations, at high temperature. In this report, we first examine previous generic repository modeling results, focusing on the first 20 years to investigate the expected evolution of the different processes that could be monitored in a full-scale heater experiment, and then present new results from ongoing modeling of the Thermal Simulation for Drift Emplacement (TSDE) experiment, a heater experiment on the in-drift emplacement concept at the Asse Mine, Germany, and provide an update on the ongoing model developments for modeling brine migration. LBNL also supported field test planning activities via contributions to and technical review of framework documents and test plans, as well as participation in workshops associated with field test planning.

Rutqvist, Jonny; Blanco Martin, Laura; Mukhopadhyay, Sumit; Houseworth, Jim; Birkholzer, Jens

2014-09-26T23:59:59.000Z

466

Avoiding another Green Elephant - A Proposal for the Next Generation HLA based on the Model Driven Architecture  

E-Print Network [OSTI]

When looking through the proceedings of the recent Simulation Interoperability Workshops, a lot of papers - some of them even awarded by the committee - are dealing with alternative concepts outside or beyond the High Level Architecture (HLA): Web Services, the extensible Markup Language (XML), Java Beans, Simple Object Access Protocol (SOAP), etc. Similarly, requirements driven by interoperability issues have resulted in the need to use meta modeling, adaptive models, and common repositories. The use of the Unified Modeling Language (UML) as a model description language is also rapidly becoming a standard. All these concepts have relations to the HLA, but they are not part of it. There seems to be the danger that HLA is overrun by respective developments of the free market and will become irrelevant finally. ... This paper introduces the MDA concept and shows, how the HLA can be integrated to become a standard stub for simulation applications of legacy systems, systems under development, and systems of the f...

Tolk, Andreas

2010-01-01T23:59:59.000Z

467

Forecast of Advanced Technology for Coal Power Generation Towards the Year of 2050 in CO2 Reduction Model of Japan  

Science Journals Connector (OSTI)

Abstract In the fossil fuel, coal is enough to get easily because it has supply and price stability brought about its ubiquitously. Coal is used for power generation as the major fuel in the world. However it is true that control of global warming should be applied to coal power generations. Therefore, many people expect CO2 reduction by technical innovation such as efficiency improvement, Carbon dioxide Capture and Storage (CCS). In case of coal power plant are considered for improving efficiency. Some of them have already put into commercial operation but others are still under R&D stage. Especially, the technical development prospect of the power plant is very important for planning the energy strategy in the resource-importing country. Japan Coal Energy Center (JCOAL) constructed a program to forecast the share of advanced coal fired plants/natural gas power plants towards the year of 2050. Then, we simulated the future prediction about 2 cases (the Japanese scenario and the world scenario). The fuel price and the existence of CCS were considered in the forecast of the technical development of the thermal power generation. Especially in the Japanese scenario, we considered the CO2 reduction target which is 80% reduction in 1990. In the world scenario, coal price had almost no influence on the share of coal fired plant. However, when the gas price increased 1.5% or more, the share of coal fired plant increased. In that case, CO2 emissions increased because coal-fired plant increased. Compared with both cases, the amount of CO2 in 2050 without CCS case was 50% higher than that of with CCS case. In Japanese scenario, achievement of 80% CO2 reduction target is impossible without CCS. If CCS is introduced into all the new establishment coal fired plant, CO2 reduction target can be attained. In the Japanese scenario, the gas price more expensive than a coal price so that the amount of the coal fired plant does not decline. Since the reduction of the amount of CO2 will be needed in all over the world, introductory promotion and technical development of CCS are very important not only Japan but also all over the world.

Takashi Nakamura; Keiji Makino; Kunihiko Shibata; Michiaki Harada

2013-01-01T23:59:59.000Z

468

Generation -IV Reactor Concepts  

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

Generation-IV Reactor Concepts Generation-IV Reactor Concepts Thomas H. Fanning Argonne National Laboratory 9700 South Cass Avenue Argonne, Illinois 60439, USA The Generation-IV International Forum (GIF) is a multi-national research and development (R&D) collaboration. The GIF pursues the development of advanced, next generation reactor technology with goals to improve: a) sustainability (effective fuel utilization and minimization of waste) b) economics (competitiveness with respect to other energy sources) c) safety and reliability (e.g., no need for offsite emergency response), and d) proliferation resistance and physical protection The GIF Technology Roadmap exercise selected six generic systems for further study: the Gas- cooled Fast Reactor (GFR), the Lead-cooled Fast Reactor (LFR), the Molten Salt Reactor (MSR),

469

Investigation of Wave Energy Converter Effects on Near-shore Wave Fields: Model Generation Validation and Evaluation - Kaneohe Bay HI.  

SciTech Connect (OSTI)

The numerical model, SWAN (Simulating WAves Nearshore) , was used to simulate wave conditions in Kaneohe Bay, HI in order to determine the effects of wave energy converter ( WEC ) devices on the propagation of waves into shore. A nested SWAN model was validated then used to evaluate a range of initial wave conditions: significant wave heights (H s ) , peak periods (T p ) , and mean wave directions ( MWD) . Differences between wave height s in the presence and absence of WEC device s were assessed at locations in shore of the WEC array. The maximum decrease in wave height due to the WEC s was predicted to be approximately 6% at 5 m and 10 m water depths. Th is occurred for model initiation parameters of H s = 3 m (for 5 m water depth) or 4 m (10 m water depth) , T p = 10 s, and MWD = 330deg . Subsequently, bottom orbital velocities were found to decrease by about 6%.

Roberts, Jesse D.; Chang, Grace; Jones, Craig

2014-09-01T23:59:59.000Z

470

EIA - Distributed Generation in Buildings  

Gasoline and Diesel Fuel Update (EIA)

Previous reports Previous reports Distributed Generation in Buildings - AEO2005 Modeling Distributed Electricity Generation in the NEMS Buildings Models - July 2002 Modeling Distributed Generation in the Buildings Sectors Supplement to the Annual Energy Outlook 2013 - Release date: August 29, 2013 Distributed and dispersed generation technologies generate electricity near the particular load they are intended to serve, such as a residential home or commercial building. EIA defines distributed generation (DG) as being connected to the electrical grid and intended to directly offset retail sales, and dispersed generation as being off-grid and often used for remote applications where grid-connected electricity is cost-prohibitive. Dispersed generation in the buildings sector is not currently gathered by

471

Generative Modeling for Continuous Non-Linearly Embedded Visual Inference Cristian Sminchisescu CRISMIN@CS.TORONTO.EDU  

E-Print Network [OSTI]

problems, like 3D human motion estimation, can be formu- lated in terms of inference using complex gen that are useful for tracking and for the reconstruction of 3D human motion in monocular video. 1. Introduction of representational power that restricts model usage to oversimplified scenarios. The use of priors in the original

Jepson, Allan D.

472

Empirical models to predict the volumes of debris flows generated by recently burned basins in the western U.S.  

E-Print Network [OSTI]

Colorado School of Mines, Department of Geology and Geological Engineering, United States Received 9 June potential volumes of wildfire-related debris flows in different regions and geologic settings. The models were developed using data from 53 recently burned basins in Colorado, Utah and California. The volumes

473

Modelling of tsunami generated by the giant Late Bronze Age eruption of Thera, South Aegean Sea, Greece  

Science Journals Connector (OSTI)

......From Magma to Tephra: Modeling Physical Processes of Explosive Volcanic Eruptions, pp...of the Am. Inst. Arch. 105th Annual Mtg., San Francisco. McCoy F.W. , Papadopoulos...hazards associated with explosion-collapse processes of a dome complex on Minoan Thear, in......

T. Novikova; G. A. Papadopoulos; F. W. McCoy

2011-08-01T23:59:59.000Z

474

Development and Demonstration of a Modeling Framework for Assessing the Efficacy of Using Mine Water for Thermoelectric Power Generation  

SciTech Connect (OSTI)

Thermoelectric power plants use large volumes of water for condenser cooling and other plant operations. Traditionally, this water has been withdrawn from the cleanest water available in streams and rivers. However, as demand for electrical power increases it places increasing demands on freshwater resources resulting in conflicts with other off stream water users. In July 2002, NETL and the Governor of Pennsylvania called for the use of water from abandoned mines to replace our reliance on the diminishing and sometimes over allocated surface water resource. In previous studies the National Mine Land Reclamation Center (NMLRC) at West Virginia University has demonstrated that mine water has the potential to reduce the capital cost of acquiring cooling water while at the same time improving the efficiency of the cooling process due to the constant water temperatures associated with deep mine discharges. The objectives of this project were to develop and demonstrate a user-friendly computer based design aid for assessing the costs, technical and regulatory aspects and potential environmental benefits for using mine water for thermoelectric generation. The framework provides a systematic process for evaluating the hydrologic, chemical, engineering and environmental factors to be considered in using mine water as an alternative to traditional freshwater supply. A field investigation and case study was conducted for the proposed 300 MW Beech Hollow Power Plant located in Champion, Pennsylvania. The field study based on previous research conducted by NMLRC identified mine water sources sufficient to reliably supply the 2-3,000gpm water supply requirement of Beech Hollow. A water collection, transportation and treatment system was designed around this facility. Using this case study a computer based design aid applicable to large industrial water users was developed utilizing water collection and handling principals derived in the field investigation and during previous studies of mine water and power plant cooling. Visual basic software was used to create general information/evaluation modules for a range of power plant water needs that were tested/verified against the Beech Hollow project. The program allows for consideration of blending mine water as needed as well as considering potential thermal and environmental benefits that can be derived from using constant temperature mine water. Users input mine water flow, quality, distance to source, elevations to determine collection, transport and treatment system design criteria. The program also evaluates low flow volumes and sustainable yields for various sources. All modules have been integrated into a seamless user friendly computer design aid and user's manual for evaluating the capital and operating costs of mine water use. The framework will facilitate the use of mine water for thermoelectric generation, reduce demand on freshwater resources and result in environmental benefits from reduced emissions and abated mine discharges.

None

2010-03-01T23:59:59.000Z

475

Thermoelectric Generators 1. Thermoelectric generator  

E-Print Network [OSTI]

. Cold Hot I - -- - - - - -- Figure 1 Electron concentration in a thermoelectric material. #12;2 A large1 Thermoelectric Generators HoSung Lee 1. Thermoelectric generator 1.1 Basic Equations In 1821 on the direction of current and material [3]. This is called the Thomson effect (or Thomson heat). These three

Lee, Ho Sung

476

High level modeling and automated generation of heterogeneous SoC architectures with optimized custom reconfigurable cores and on-chip communication media  

Science Journals Connector (OSTI)

In this paper we propose a framework for modeling and automated generation of heterogeneous SoC architectures with emphasis on reconfigurable component integration and optimized communication media. In order to facilitate rapid development of SoC architectures, communication-centric platforms for data intensive applications, high level modeling of reconfigurable components for quick simulation and a tool for generation of complete SoC architectures is presented. Four different communication-centric platforms based on traditional bus, crossbar, hierarchical bus and novel hybrid communication media are proposed. These communication-centric platforms are proposed to cater for the different communication requirement of future SoC architectures. Multi-Standard telecommunication application is chosen as our target application domain and a case study of WiMAX is used as a real world example to demonstrate the effectiveness of our approach. A system consisting of an ARM processor, reconfigurable FFT and reconfigurable Viterbi decoder is considered with the option of system scalability for future upgrades. Behavior of system with different communication platforms is analyzed for its throughput and power characteristics with different reconfigurable scenarios to show the effectiveness of our approach.

Balal Ahmad; Ali Ahmadinia; Tughrul Arslan

2010-01-01T23:59:59.000Z

477

Hybrid permanent magnet and variable reluctance generator  

SciTech Connect (OSTI)

This patent describes a hybrid electrical generator. It comprises: a permanent magnet generator having a permanent magnet rotor mounted on a shaft, the permanent magnet generator providing an output voltage over an operating range which falls in response to an increasing electrical load; a variable reluctance generator having a rotor mounted on the shaft with excitation of a stator of the variable reluctance generator being provided from the permanent magnet generator, the variable reluctance generator providing an output voltage which varies in response to an increasing electrical load over an operating range; and a voltage regulator, responsive to combined output voltages of the generators, for controlling the output voltage provided by the variable reluctance generator.

Vaidya, J.; Belanger, D.J.

1990-09-25T23:59:59.000Z

478

Quasiseparable Generators  

Science Journals Connector (OSTI)

It is clear from the preceding chapter that any matrix has quasiseparable representations. By padding given quasiseparable generators with zero matrices of large sizes one ... large orders. However, one is lookin...

Yuli Eidelman; Israel Gohberg…

2014-01-01T23:59:59.000Z

479

Power and Frequency Control as it Relates to Wind-Powered Generation  

E-Print Network [OSTI]

Undrill. 1975. "Automatic Generation Control", IEEE Tutorialfraction of generation providing response grid. The adjustment of generation, minute-by- minute, in

Lacommare, Kristina S H

2011-01-01T23:59:59.000Z

480

Soranakom, C., Yekani-Fard, M., and Mobasher, B., "Modeling of Aging Response in Glass Fiber Reinforced Concrete Flexural Specimens," 15th International Glass Fibre Reinforced  

E-Print Network [OSTI]

Congress, GRC 2008, CD-Proceedings, Prague, April 20-23, 2008 1 Modeling of Aging Response in Glass Fiber caused by the chemical and physical processes. Glass fibers chemically degrade in the alkaline hydrated approach for GFRC is possible. The 1 Graduate Research Assistant Department of Civil and Environmental

Mobasher, Barzin

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


481

Published in Proceedings of the XL2003 (Response of Structures to Extreme Loading) Conference, Toronto, August 2003. EFFICIENT MODELS FOR WIND TURBINE EXTREME LOADS  

E-Print Network [OSTI]

, Toronto, August 2003. EFFICIENT MODELS FOR WIND TURBINE EXTREME LOADS USING INVERSE RELIABILITY K, USA ABSTRACT The reliability of wind turbines against extreme loads is the focus of this study of randomness in the gross wind environment as well as in the extreme response given wind conditions. A detailed

Manuel, Lance

482

Mechanics of torque generation in the bacterial flagellar motor  

E-Print Network [OSTI]

The bacterial flagellar motor (BFM) is responsible for driving bacterial locomotion and chemotaxis, fundamental processes in pathogenesis and biofilm formation. In the BFM, torque is generated at the interface between transmembrane proteins (stators) and a rotor. It is well-established that the passage of ions down a transmembrane gradient through the stator complex provides the energy needed for torque generation. However, the physics involved in this energy conversion remain poorly understood. Here we propose a mechanically specific model for torque generation in the BFM. In particular, we identify two fundamental forces involved in torque generation: electrostatic and steric. We propose that electrostatic forces serve to position the stator, while steric forces comprise the actual 'power stroke'. Specifically, we predict that ion-induced conformational changes about a proline 'hinge' residue in an $\\alpha$-helix of the stator are directly responsible for generating the power stroke. Our model predictions fit well with recent experiments on a single-stator motor. Furthermore, we propose several experiments to elucidate the torque-speed relationship in motors where the number of stators may not be constant. The proposed model provides a mechanical explanation for several fundamental features of the flagellar motor, including: torque-speed and speed-ion motive force relationships, backstepping, variation in step sizes, and the puzzle of swarming experiments.

Kranthi K. Mandadapu; Jasmine A. Nirody; Richard M. Berry; George Oster

2015-01-13T23:59:59.000Z

483

PROGRESS TOWARDS NEXT GENERATION, WAVEFORM BASED THREE-DIMENSIONAL MODELS AND METRICS TO IMPROVE NUCLEAR EXPLOSION MONITORING IN THE MIDDLE EAST  

SciTech Connect (OSTI)

Efforts to update current wave speed models of the Middle East require a thoroughly tested database of sources and recordings. Recordings of seismic waves traversing the region from Tibet to the Red Sea will be the principal metric in guiding improvements to the current wave speed model. Precise characterizations of the earthquakes, specifically depths and faulting mechanisms, are essential to avoid mapping source errors into the refined wave speed model. Errors associated with the source are manifested in amplitude and phase changes. Source depths and paths near nodal planes are particularly error prone as small changes may severely affect the resulting wavefield. Once sources are quantified, regions requiring refinement will be highlighted using adjoint tomography methods based on spectral element simulations [Komatitsch and Tromp (1999)]. An initial database of 250 regional Middle Eastern events from 1990-2007, was inverted for depth and focal mechanism using teleseismic arrivals [Kikuchi and Kanamori (1982)] and regional surface and body waves [Zhao and Helmberger (1994)]. From this initial database, we reinterpreted a large, well recorded subset of 201 events through a direct comparison between data and synthetics based upon a centroid moment tensor inversion [Liu et al. (2004)]. Evaluation was done using both a 1D reference model [Dziewonski and Anderson (1981)] at periods greater than 80 seconds and a 3D model [Kustowski et al. (2008)] at periods of 25 seconds and longer. The final source reinterpretations will be within the 3D model, as this is the initial starting point for the adjoint tomography. Transitioning from a 1D to 3D wave speed model shows dramatic improvements when comparisons are done at shorter periods, (25 s). Synthetics from the 1D model were created through mode summations while those from the 3D simulations were created using the spectral element method. To further assess errors in source depth and focal mechanism, comparisons between the three methods were made. These comparisons help to identify problematic stations and sources which may bias the final solution. Estimates of standard errors were generated for each event's source depth and focal mechanism to identify poorly constrained events. A final, well characterized set of sources and stations will be then used to iteratively improve the wave speed model of the Middle East. After a few iterations during the adjoint inversion process, the sources will be reexamined and relocated to further reduce mapping of source errors into structural features. Finally, efforts continue in developing the infrastructure required to 'quickly' generate event kernels at the n-th iteration and invert for a new, (n+1)-th, wave speed model of the Middle East. While development of the infrastructure proceeds, initial tests using a limited number of events shows the 3D model, while showing vast improvement compared to the 1D model, still requires substantial modifications. Employing our new, full source set and iterating the adjoint inversions at successively shorter periods will lead to significant changes and refined wave speed structures of the Middle East.

Savage, B; Peter, D; Covellone, B; Rodgers, A; Tromp, J

2009-07-02T23:59:59.000Z

484

North-South asymmetry in the modeled phytoplankton community response to climate change over the 21st century  

E-Print Network [OSTI]

of com- plex Earth System Models uses widely differentacross the IPCC AR5 earth system models, manuscript in

Marinov, Irina; Doney, Scott C; Lima, Ivan D; Lindsay, K.; Moore, J. K; Mahowald, N.

2013-01-01T23:59:59.000Z

485

Forced response of the East Asian summer rainfall over the past millennium: results from a coupled model simulation  

E-Print Network [OSTI]

of a millennium simulation of the coupled ECHO-G model. The model results indicate that the centennial

Wang, Bin

486

Microwave generator  

DOE Patents [OSTI]

A microwave generator is provided for generating microwaves substantially from virtual cathode oscillation. Electrons are emitted from a cathode and accelerated to an anode which is spaced apart from the cathode. The anode has an annular slit there through effective to form the virtual cathode. The anode is at least one range thickness relative to el