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Note: This page contains sample records for the topic "generation optimization methods" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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1

Power Generation Loading Optimization using a Multi-Objective Constraint-Handling Method via  

E-Print Network [OSTI]

results of the power generation loading optimization based on a coal-fired power plant demonstrates algorithm in solving significant industrial problems. I. INTRODUCTION Most power generation plants have.e., heat rate/NOx vs. load, for a given plant condition. There are two objectives for the power generation

Li, Xiaodong

2

Optimization Online - Dynamic Generation of Scenario Trees  

E-Print Network [OSTI]

Sep 3, 2014 ... Abstract: We present new algorithms for the dynamic generation of scenario trees for multistage stochastic optimization. The different methods ...

G. Ch. Pflug

2014-09-03T23:59:59.000Z

3

One Optimal Sizing Method for Designing Hybrid Solar-Wind-Diesel Power Generation Systems  

Science Journals Connector (OSTI)

This paper recommended an optimal design model for designing stand-alone hybrid solar-wind-diesel systems. The optimum configuration ensures that the annualized cost of the systems is minimized while satisfying t...

Zhou Wei; Yang Hongxing

2009-01-01T23:59:59.000Z

4

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

5

Derivative Free Optimization Methods for Optimizing Stirrer ...  

E-Print Network [OSTI]

It also gives a comparison of the two optimization algorithms. Key words: Energy, Numerical Optimization, Derivative-Free Optimization,. Computational Fluid ... numerical simulations are needed for the computation of the fluid flow inside the stirrer for ..... Optimization Methods and Software, 20 (2005) 493-508. [6] A. R. Conn ...

2007-02-01T23:59:59.000Z

6

Generating Optimized Code from SCR Specifications Tom Rothamel  

E-Print Network [OSTI]

Generating Optimized Code from SCR Specifications Tom Rothamel Yanhong A. Liu Stony Brook for generating efficient code from SCR (Software Cost Reduction) specifications. While the SCR tabular notation now SCR has lacked an automated method for generating optimized code. This paper describes an ef

Liu, Yanhong Annie

7

Optimization Online - Cut Generation for Optimization Problems with ...  

E-Print Network [OSTI]

Jul 26, 2014 ... Cut Generation for Optimization Problems with Multivariate Risk Constraints. Simge Küçükyavuz (kucukyavuz.2 ***at*** osu.edu) Nilay Noyan ...

Simge Küçükyavuz

2014-07-26T23:59:59.000Z

8

Finding Optimal Probabilistic Generators for XML Collections  

E-Print Network [OSTI]

Finding Optimal Probabilistic Generators for XML Collections Serge Abiteboul INRIA Saclay ENS (generative) probabilistic model, where optimality here means maximizing the like- lihood of the particular corpus to be generated. Focusing first on the structure of documents, we present an efficient algorithm

Paris-Sud XI, Université de

9

Distributed Generation Dispatch Optimization under Various Electricity Tariffs  

E-Print Network [OSTI]

Distributed Generation Dispatch Optimization Under Various Electricity Tariffs which generatorsDistributed Generation Dispatch Optimization Under Various Electricity Tariffs • no-DG – The generator

Firestone, Ryan; Marnay, Chris

2007-01-01T23:59:59.000Z

10

Definition: Optimized Generator Operation | Open Energy Information  

Open Energy Info (EERE)

Optimized Generator Operation Optimized Generator Operation Jump to: navigation, search Dictionary.png Optimized Generator Operation Better forecasting and monitoring of load and grid performance would enable grid operators to dispatch a more efficient mix of generation that could be optimized to reduce cost. The coordinated operation of energy storage, distributed generation, or plug-in electric vehicle assets could also result in completely avoiding central generation dispatch.[1] Related Terms sustainability References ↑ SmartGrid.gov 'Description of Benefits' An LikeLike UnlikeLike You like this.Sign Up to see what your friends like. inline Glossary Definition Retrieved from "http://en.openei.org/w/index.php?title=Definition:Optimized_Generator_Operation&oldid=502509" Categories:

11

Visual-based methods in compliant mechanism optimization  

E-Print Network [OSTI]

The purpose of this research is to generate visual-based methods for optimizing compliant mechanisms (CMs). Visual-based optimization methods use graphical representations (3-D plots) of CM performance to convey design ...

Timm, Richard W. (Richard William)

2006-01-01T23:59:59.000Z

12

A Novel Optimization Method for the Electric Topology of Thermoelectric Modules Used in an Automobile Exhaust Thermoelectric Generator  

Science Journals Connector (OSTI)

Based on Bi2Te3 thermoelectric modules, a kind of automobile exhaust thermoelectric generator (AETEG) with a ... heat exchanger and cooling system. Then, their electric topology (series or parallel hybrid) was .....

Rui Quan; Xinfeng Tang; Shuhai Quan; Liang Huang

2013-07-01T23:59:59.000Z

13

Optimal Integrated Code Generation for Clustered VLIW Architectures  

E-Print Network [OSTI]

allows us to describe and optimize for irregular register and memory structures. In order to obtain or the power consumption, or by an efficient utilization of registers. Generating code consists in solving scheduling, and register allocation. We describe a method for fully integrated optimal code genera- tion

Kessler, Christoph

14

Optimal Integrated Code Generation for Clustered VLIW Architectures  

E-Print Network [OSTI]

allows us to describe and optimize for irregular register and memory structures. In order to obtain or the power consumption, or by an efficient utilization of registers. Generating code consists in solving scheduling, and register allocation. We describe a method for fully integrated optimal code genera­ tion

Kessler, Christoph

15

NERSC Leads Next-Generation Code Optimization Effort  

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

Leads Next-Generation Code Optimization Effort NERSC Launches Next-Generation Code Optimization Effort NERSC, Intel, Cray team up to prepare users for transition to exascale...

16

Optimization Online - Level methods uniformly optimal for composite ...  

E-Print Network [OSTI]

Apr 19, 2011 ... Level methods uniformly optimal for composite and structured nonsmooth convex optimization. Guanghui Lan (glan ***at*** ise.ufl.edu).

Guanghui Lan

2011-04-19T23:59:59.000Z

17

Building Energy Optimization Analysis Method (BEopt) - Building...  

Energy Savers [EERE]

Energy Optimization Analysis Method (BEopt) - Building America Top Innovation Building Energy Optimization Analysis Method (BEopt) - Building America Top Innovation House graphic...

18

Bayesian method for global optimization  

Science Journals Connector (OSTI)

We introduce a Bayesian approach for obtaining the global optimum of multimodal functions. The set of observed minima of a multimodal function is viewed as a sample from a multinomial distribution, whose cells correspond to the basins of attraction of the local optima. We then derive the posterior distribution of the number of local optima. This posterior information is obtained from a Bayesian analysis and is used to construct a stopping criterion for a sequential random search method which finds the optimal tradeoff between reliability and computational effort. The computational complexity of this global optimization method is a strong function of the total number of local optima and a weak function of the dimensions of the configuration space. Application to four classical problems from the global optimization literature, a bifunctional catalytic reactor problem, and the conformation problem of Lennard-Jones microclusters is demonstrated. Comparisons with the Bayesian method of Boender and Rinooy Kan [Math. Program. 37, 59 (1987)] and the simulated annealing method of Dekkers and Aarts [Math. Program. 50, 367 (1991)] are provided and, in each case, the computational complexity of our method is shown to be smaller than that of these methods.

Prasana K. Venkatesh; Morrel H. Cohen; Robert W. Carr; Anthony M. Dean

1997-05-01T23:59:59.000Z

19

An optimized Method to Identify RR Lyrae stars in the SDSS X Pan-STARRS1 Overlapping Area Using a Bayesian Generative Technique  

E-Print Network [OSTI]

We present a method for selecting RR Lyrae (RRL) stars (or other type of variable stars) in the absence of a large number of multi-epoch data and light curve analyses. Our method uses color and variability selection cuts that are defined by applying a Gaussian Mixture Bayesian Generative Method (GMM) on 636 pre-identified RRL stars instead of applying the commonly used rectangular cuts. Specifically, our method selects 8,115 RRL candidates (heliocentric distances efficiency and completeness levels of our method are ~77% and ~52%, respectively. Most contaminants are either non-variable main-sequence stars or stars in eclipsing systems. The method described here efficiently recovers known stellar halo substructures. It is expected that the current completene...

Abbas, M A; Martin, N F; Kaiser, N; Burgett, W S; Huber, M E; Waters, C

2014-01-01T23:59:59.000Z

20

NEWTON'S METHOD FOR MULTIOBJECTIVE OPTIMIZATION ...  

E-Print Network [OSTI]

truss optimization [8, 29, 40], design [27, 20, 38], space exploration [34, 41]), statis- tics [5], management ... Moreover, the corresponding optimization process is usually aug- ...... of optimal ressource allocation in job-shop production. European ...

Note: This page contains sample records for the topic "generation optimization methods" 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

Utility Solar Generation Valuation Methods  

SciTech Connect (OSTI)

Tucson Electric Power (TEP) developed, tested and verified the results of a new and appropriate method for accurately evaluating the capacity credit of time variant solar generating sources and reviewed new methods to appropriately and fairly evaluate the value of solar generation to electric utilities. The project also reviewed general integrated approaches for adequately compensating owners of solar generation for their benefits to utilities. However, given the limited funding support and time duration of this project combined with the significant differences between utilities regarding rate structures, solar resource availability and coincidence of solar generation with peak load periods, it is well beyond the scope of this project to develop specific rate, rebate, and interconnection approaches to capture utility benefits for all possible utilities. The project developed computer software based evaluation method models to compare solar generation production data measured in very short term time increments called Sample Intervals over a typical utility Dispatch Cycle during an Evaluation Period against utility system load data. Ten second resolution generation production data from the SGSSS and actual one minute resolution TEP system load data for 2006 and 2007, along with data from the Pennington Street Garage 60 kW DC capacity solar unit installed in downtown Tucson will be applied to the model for testing and verification of the evaluation method. Data was provided by other utilities, but critical time periods of data were missing making results derived from that data inaccurate. The algorithms are based on previous analysis and review of specific 2005 and 2006 SGSSS production data. The model was built, tested and verified by in house TEP personnel. For this phase of the project, TEP communicated with, shared solar production data with and collaborated on the development of solar generation valuation tools with other utilities, including Arizona Public Service, Salt River Project, Xcel and Nevada Power Company as well as the Arizona electric cooperatives. In the second phase of the project, three years of 10 second power output data of the SGSSS was used to evaluate the effectiveness of frequency domain analysis, normal statistical distribution analysis and finally maximum/minimum differential output analysis to test the applicability of these mathematic methods in accurately modeling the output variations produced by clouds passing over the SGSSS array.

Hansen, Thomas N.; Dion, Phillip J.

2009-06-30T23:59:59.000Z

22

Fast Methods for Bimolecular Charge Optimization  

E-Print Network [OSTI]

We report a Hessian-implicit optimization method to quickly solve the charge optimization problem over protein molecules: given a ligand and its complex with a receptor, determine the ligand charge distribution that minimizes ...

Bardhan, Jaydeep P.

23

Optimal Algorithms for Generating Discrete Random Variables with Changing Distributions  

E-Print Network [OSTI]

Optimal Algorithms for Generating Discrete Random Variables with Changing Distributions T. Hagerup arithmetic and the floor function, 3. generating a uniformly distributed real number between 0 and 1 K. Mehlhorn I. Munro Abstract We give optimal algorithms for generating discrete random variables

Mehlhorn, Kurt

24

Optimization Online - Splitting methods for nonconvex composite ...  

E-Print Network [OSTI]

Jul 2, 2014 ... Splitting methods for nonconvex composite optimization. Guoyin Li (g.li ***at*** unsw.edu.au) Ting Kei Pong (tkpong ***at*** cs.ubc.ca).

Guoyin Li

2014-07-02T23:59:59.000Z

25

Hybrid robust predictive optimization method of power system dispatch  

DOE Patents [OSTI]

A method of power system dispatch control solves power system dispatch problems by integrating a larger variety of generation, load and storage assets, including without limitation, combined heat and power (CHP) units, renewable generation with forecasting, controllable loads, electric, thermal and water energy storage. The method employs a predictive algorithm to dynamically schedule different assets in order to achieve global optimization and maintain the system normal operation.

Chandra, Ramu Sharat (Niskayuna, NY); Liu, Yan (Ballston Lake, NY); Bose, Sumit (Niskayuna, NY); de Bedout, Juan Manuel (West Glenville, NY)

2011-08-02T23:59:59.000Z

26

ENERGY PAYBACK OPTIMIZATION OF THERMOELECTRIC POWER GENERATOR SYSTEMS  

E-Print Network [OSTI]

and the thermoelectric module should be performed. Active cooling and the design of the heat sink are customized to findENERGY PAYBACK OPTIMIZATION OF THERMOELECTRIC POWER GENERATOR SYSTEMS Kazuaki Yazawa Dept model for optimizing thermoelectric power generation system is developed and utilized for parametric

27

Generators-of-Generators Library with Optimization Capabilities in Fortress  

Science Journals Connector (OSTI)

A large number of studies have been conducted on parallel skeletons and optimization theorems over skeleton programs to resolve difficulties with parallel programming. However, two nontrivial tasks still remai...

Kento Emoto; Zhenjiang Hu; Kazuhiko Kakehi…

2010-01-01T23:59:59.000Z

28

Optimal allocation of stochastically dependent renewable energy based distributed generators in unbalanced distribution networks  

Science Journals Connector (OSTI)

Abstract This paper proposes an algorithm for modeling stochastically dependent renewable energy based distributed generators for the purpose of proper planning of unbalanced distribution networks. The proposed algorithm integrate the diagonal band Copula and sequential Monte Carlo method in order to accurately consider the multivariate stochastic dependence between wind power, photovoltaic power and the system demand. Secondly, an efficient algorithm based on modification of the traditional Big Bang-Big crunch method is proposed for optimal placement of renewable energy based distributed generators in the presence of dispatchable distributed generation. The proposed optimization algorithm aims to minimize the energy loss in unbalanced distribution systems by determining the optimal locations of non-dispatchable distributed generators and the optimal hourly power schedule of dispatchable distributed generators. The proposed algorithms are implemented in MATLAB environment and tested on the IEEE 37-node feeder. Several case studies are done and the subsequent discussions show the effectiveness of the proposed algorithms.

A.Y. Abdelaziz; Y.G. Hegazy; Walid El-Khattam; M.M. Othman

2015-01-01T23:59:59.000Z

29

Optimized Hydrogen and Electricity Generation from Wind  

Broader source: Energy.gov [DOE]

Several optimizations can be employed to create hydrogen and electricity from a wind energy source. The key element in hydrogen production from an electrical source is an electrolyzer to convert water and electricity into hydrogen and oxygen.

30

Multidisciplinary Optimization Methods for Preliminary Design  

Science Journals Connector (OSTI)

An overview of multidisciplinary optimization (MDO) methodology and two applications of this methodology to the preliminary design phase are presented. These applications are being undertaken to improve, develop, validate and demonstrate MDO methods. ...

Korte J. J.; Weston R. P.; Zang T. A.

1997-04-01T23:59:59.000Z

31

Apparatuses and methods for generating electric fields  

DOE Patents [OSTI]

Apparatuses and methods relating to generating an electric field are disclosed. An electric field generator may include a semiconductive material configured in a physical shape substantially different from a shape of an electric field to be generated thereby. The electric field is generated when a voltage drop exists across the semiconductive material. A method for generating an electric field may include applying a voltage to a shaped semiconductive material to generate a complex, substantially nonlinear electric field. The shape of the complex, substantially nonlinear electric field may be configured for directing charged particles to a desired location. Other apparatuses and methods are disclosed.

Scott, Jill R; McJunkin, Timothy R; Tremblay, Paul L

2013-08-06T23:59:59.000Z

32

Method for protecting an electric generator  

DOE Patents [OSTI]

A method for protecting an electrical generator which includes providing an electrical generator which is normally synchronously operated with an electrical power grid; providing a synchronizing signal from the electrical generator; establishing a reference signal; and electrically isolating the electrical generator from the electrical power grid if the synchronizing signal is not in phase with the reference signal.

Kuehnle, Barry W. (Ammon, ID); Roberts, Jeffrey B. (Ammon, ID); Folkers, Ralph W. (Ammon, ID)

2008-11-18T23:59:59.000Z

33

Optimal Allocation of Distributed Generators in a Distribution Network Using Adaptive Multi-Objective Particle Swarm Optimization  

Science Journals Connector (OSTI)

This study presents the optimal allocation of distributed generators (DGs) in distribution network based on...

Shan Cheng; Min-You Chen; Peter J. Fleming…

2012-01-01T23:59:59.000Z

34

Advanced Methods Approach to Hybrid Powertrain Systems Optimization...  

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

Methods Approach to Hybrid Powertrain Systems Optimization of a Transit Bus Application Advanced Methods Approach to Hybrid Powertrain Systems Optimization of a Transit Bus...

35

Thermoelectric generator apparatus and operation method  

SciTech Connect (OSTI)

A method of operating a thermoelectric generator includes: cyclically producing increasing then decreasing temperature differences in the thermoelectric material of the generator; and generating a cyclically increasing then decreasing electrical generator output signal, in response to such temperature differences, to transmit electrical power generated by the generator from the generator. Part of the thermoelectric material reaches temperatures substantially above the melting temperature of the material. The thermoelectric material of the generator forms a part of a closed electrical loop about a transformer core so that the inductor voltage for the loop serves as the output signal of the generator. A thermoelectric generator, which can be driven by the described method of operation, incorporates fins into a thermopile to conduct heat toward or away from the alternating spaces between adjacent layers of different types of thermoelectric material. The fins extend from between adjacent layers, so that they can also conduct electrical current between such layers, perpendicularly to the direction of stacking of the layers. The exhaust from an internal combustion engine can be employed to drive the thermoelectric generator, and, also, to act as a driver for a thermoelectric generator in accordance with the method of operation initially described.

Lowther, F.E.

1984-07-31T23:59:59.000Z

36

Optimal allocation of multi-type distributed generators using backtracking search optimization algorithm  

Science Journals Connector (OSTI)

Abstract In this article, a very recently swarm optimization technique namely a backtracking search optimization algorithm (BSOA) is addressed to assign the distributed generators (DGs) along radial distribution networks. One of the main features of the BSOA is a single control parameter and not over sensitive to the initial value of this factor. The objective function is adapted with weighting factor to reduce the network real loss and enhance the voltage profile with the purpose of improving the operating performance. In addition, the combined power factor and reduction in network reactive power loss are spotted. Set of fuzzy expert rules using loss sensitivity factors and bus voltages are employed to identify the initial DG’s locations. The proposed approach is attuned to tackle the shortfall of loss sensitivity factors and to decide the final placement of the DGs. Two types of the \\{DGs\\} are studied and investigated. The proposed method is demonstrated and validated thru many radial distribution networks with different sizes and complexities. The BSOA-based methodology can efficiently generate high-quality solutions compared to other competitive techniques in the literature.

Attia El-Fergany

2015-01-01T23:59:59.000Z

37

Particle Swarm Optimization and Gradient Descent Methods for Optimization of PI Controller for AGC of Multi-area Thermal-Wind-Hydro Power Plants  

Science Journals Connector (OSTI)

The automatic generation control (AGC) of three unequal interconnected Thermal, Wind and Hydro power plant has been designed with PI controller. Further computational intelligent technique Particle Swarm Optimization and conventional Gradient Descent ... Keywords: Automatic generation control, Particle swarm optimization, Gradient Descent method, Generation rate constraint, Area control error, Wind energy conversion system

Naresh Kumari; A N. Jha

2013-04-01T23:59:59.000Z

38

Power generation method including membrane separation  

DOE Patents [OSTI]

A method for generating electric power, such as at, or close to, natural gas fields. The method includes conditioning natural gas containing C.sub.3+ hydrocarbons and/or acid gas by means of a membrane separation step. This step creates a leaner, sweeter, drier gas, which is then used as combustion fuel to run a turbine, which is in turn used for power generation.

Lokhandwala, Kaaeid A. (Union City, CA)

2000-01-01T23:59:59.000Z

39

MULTIOBJECTIVE OPTIMIZATION POWER GENERATION SYSTEMS INVOLVING CHEMICAL LOOPING COMBUSTION  

SciTech Connect (OSTI)

Integrated Gasification Combined Cycle (IGCC) system using coal gasification is an important approach for future energy options. This work focuses on understading the system operation and optimizing it in the presence of uncertain operating conditions using ASPEN Plus and CAPE-OPEN compliant stochastic simulation and multiobjective optimization capabilities developed by Vishwamitra Research Institute. The feasible operating surface for the IGCC system is generated and deterministic multiobjective optimization is performed. Since the feasible operating space is highly non-convex, heuristics based techniques that do not require gradient information are used to generate the Pareto surface. Accurate CFD models are simultaneously developed for the gasifier and chemical looping combustion system to characterize and quantify the process uncertainty in the ASPEN model.

Juan M. Salazar; Urmila M. Diwekar; Stephen E. Zitney

2009-01-01T23:59:59.000Z

40

Optimization Algorithm for the Generation of ONCV Pseudopotentials  

E-Print Network [OSTI]

We present an optimization algorithm to construct pseudopotentials and use it to generate a set of Optimized Norm-Conserving Vanderbilt (ONCV) pseudopotentials for elements up to Z=83 (Bi) (excluding Lanthanides). We introduce a quality function that assesses the agreement of a pseudopotential calculation with all-electron FLAPW results, and the necessary plane-wave energy cutoff. This quality function allows us to use a Nelder-Mead optimization algorithm on a training set of materials to optimize the input parameters of the pseudopotential construction for most of the periodic table. We control the accuracy of the resulting pseudopotentials on a test set of materials independent of the training set. We find that the automatically constructed pseudopotentials provide a good agreement with the all-electron results obtained using the FLEUR code with a plane-wave energy cutoff of approximately 60 Ry.

Schlipf, Martin

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "generation optimization methods" 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

A fast ascent trajectory optimization method for hypersonic air-breathing vehicles.  

E-Print Network [OSTI]

??The objective of this dissertation is to investigate a fast and reliable method to generate three-dimensional optimal ascent trajectories for hypersonic air-breathing vehicles. The problem… (more)

Murillo, Oscar Jaime

2010-01-01T23:59:59.000Z

42

Application of honey-bee mating optimization on state estimation of a power distribution system including distributed generators  

Science Journals Connector (OSTI)

We present a new approach based on honey-bee mating optimization to estimate the state variables in distribution networks including distributed generators. The proposed method considers practical models of...

Taher Niknam

2008-12-01T23:59:59.000Z

43

A New Method for Optimal Configuration of Weapon System  

Science Journals Connector (OSTI)

This paper put forward a new method for Optimal Configuration of Weapon System (OCWS). It combines PROMETHEE II...

Dechao Zhou; Shiyan Sun; Qiang Wang

2009-01-01T23:59:59.000Z

44

Multi-objective quasi-oppositional teaching learning based optimization for optimal location of distributed generator in radial distribution systems  

Science Journals Connector (OSTI)

Abstract This paper presents a novel quasi-oppositional teaching learning based optimization (QOTLBO) methodology in order to find the optimal location of distributed generator to simultaneously optimize power loss, voltage stability index and voltage deviation of radial distribution network. The basic disadvantage of the original teaching learning based optimization (TLBO) algorithm is that it gives a near optimal solution rather than an optimal one in a limited iteration cycles. In this paper, opposition based learning (OBL) and quasi OBL concepts are introduced in original TLBO algorithm for improving the convergence speed and simulation results of TLBO. In order to show the effectiveness and superiority, the proposed algorithms are tested on 33-bus, 69-bus and 118-bus radial distribution networks. The simulation results of the proposed methods are compared with those obtained by other artificial intelligence techniques like GA/PSO, GA, PSO and loss sensitivity factor simulated annealing (LSFSA). The results show that the QOTLBO surpasses the other techniques in terms of solution quality.

Sneha Sultana; Provas Kumar Roy

2014-01-01T23:59:59.000Z

45

Lexicon generation methods, lexicon generation devices, and lexicon generation articles of manufacture  

DOE Patents [OSTI]

Lexicon generation methods, computer implemented lexicon editing methods, lexicon generation devices, lexicon editors, and articles of manufacture are described according to some aspects. In one aspect, a lexicon generation method includes providing a seed vector indicative of occurrences of a plurality of seed terms within a plurality of text items, providing a plurality of content vectors indicative of occurrences of respective ones of a plurality of content terms within the text items, comparing individual ones of the content vectors with respect to the seed vector, and responsive to the comparing, selecting at least one of the content terms as a term of a lexicon usable in sentiment analysis of text.

Carter, Richard J [Richland, WA; McCall, Jonathon D [West Richland, WA; Whitney, Paul D [Richland, WA; Gregory, Michelle L [Richland, WA; Turner, Alan E [Kennewick, WA; Hetzler, Elizabeth G [Kennewick, WA; White, Amanda M [Kennewick, WA; Posse, Christian [Seattle, WA; Nakamura, Grant C [Kennewick, WA

2010-10-26T23:59:59.000Z

46

Electrical motor/generator drive apparatus and method  

DOE Patents [OSTI]

The present disclosure includes electrical motor/generator drive systems and methods that significantly reduce inverter direct-current (DC) bus ripple currents and thus the volume and cost of a capacitor. The drive methodology is based on a segmented drive system that does not add switches or passive components but involves reconfiguring inverter switches and motor stator winding connections in a way that allows the formation of multiple, independent drive units and the use of simple alternated switching and optimized Pulse Width Modulation (PWM) schemes to eliminate or significantly reduce the capacitor ripple current.

Su, Gui Jia

2013-02-12T23:59:59.000Z

47

Hybrid method for aerodynamic shape optimization in automotive industry  

E-Print Network [OSTI]

Hybrid method for aerodynamic shape optimization in automotive industry Freedeerique Muyl April 2003; accepted 4 June 2003 Abstract An aerodynamic shape optimization tool for complex industrial reasons, concerns car manufacturers. Consequently, the improvement of the aerodynamics of car shapes, more

Dumas, Laurent

48

Method for generating a plasma wave to accelerate electrons  

DOE Patents [OSTI]

The invention provides a method and apparatus for generating large amplitude nonlinear plasma waves, driven by an optimized train of independently adjustable, intense laser pulses. In the method, optimal pulse widths, interpulse spacing, and intensity profiles of each pulse are determined for each pulse in a series of pulses. A resonant region of the plasma wave phase space is found where the plasma wave is driven most efficiently by the laser pulses. The accelerator system of the invention comprises several parts: the laser system, with its pulse-shaping subsystem; the electron gun system, also called beam source, which preferably comprises photo cathode electron source and RF-LINAC accelerator; electron photo-cathode triggering system; the electron diagnostics; and the feedback system between the electron diagnostics and the laser system. The system also includes plasma source including vacuum chamber, magnetic lens, and magnetic field means. The laser system produces a train of pulses that has been optimized to maximize the axial electric field amplitude of the plasma wave, and thus the electron acceleration, using the method of the invention.

Umstadter, Donald (Ann Arbor, MI); Esarey, Eric (Chevy Chase, MD); Kim, Joon K. (Ann Arbor, MI)

1997-01-01T23:59:59.000Z

49

Method for generating a plasma wave to accelerate electrons  

DOE Patents [OSTI]

The invention provides a method and apparatus for generating large amplitude nonlinear plasma waves, driven by an optimized train of independently adjustable, intense laser pulses. In the method, optimal pulse widths, interpulse spacing, and intensity profiles of each pulse are determined for each pulse in a series of pulses. A resonant region of the plasma wave phase space is found where the plasma wave is driven most efficiently by the laser pulses. The accelerator system of the invention comprises several parts: the laser system, with its pulse-shaping subsystem; the electron gun system, also called beam source, which preferably comprises photo cathode electron source and RF-LINAC accelerator; electron photo-cathode triggering system; the electron diagnostics; and the feedback system between the electron diagnostics and the laser system. The system also includes plasma source including vacuum chamber, magnetic lens, and magnetic field means. The laser system produces a train of pulses that has been optimized to maximize the axial electric field amplitude of the plasma wave, and thus the electron acceleration, using the method of the invention. 21 figs.

Umstadter, D.; Esarey, E.; Kim, J.K.

1997-06-10T23:59:59.000Z

50

Design optimization of a fuzzy distributed generation (DG) system with multiple renewable energy sources  

Science Journals Connector (OSTI)

The global rise in energy demands brings major obstacles to many energy organizations in providing adequate energy supply. Hence many techniques to generate cost effective reliable and environmentally friendly alternative energy source are being explored. One such method is the integration of photovoltaic cells wind turbine generators and fuel-based generators included with storage batteries. This sort of power systems are known as distributed generation (DG) power system. However the application of DG power systems raise certain issues such as cost effectiveness environmental impact and reliability. The modelling as well as the optimization of this DG power system was successfully performed in the previous work using Particle Swarm Optimization (PSO). The central idea of that work was to minimize cost minimize emissions and maximize reliability (multi-objective (MO) setting) with respect to the power balance and design requirements. In this work we introduce a fuzzy model that takes into account the uncertain nature of certain variables in the DG system which are dependent on the weather conditions (such as; the insolation and wind speed profiles). The MO optimization in a fuzzy environment was performed by applying the Hopfield Recurrent Neural Network (HNN). Analysis on the optimized results was then carried out.

2012-01-01T23:59:59.000Z

51

Distributed Generation Dispatch Optimization under Various Electricity Tariffs  

E-Print Network [OSTI]

Optimization Under Various Electricity Tariffs Firestone,Optimization Under Various Electricity Tariffs Table of3 2.1 Electricity Tariff

Firestone, Ryan; Marnay, Chris

2007-01-01T23:59:59.000Z

52

Aerodynamic Shape Design of Nozzles Using a Hybrid Optimization Method  

E-Print Network [OSTI]

A hybrid design optimization method combining the stochastic method based on simultaneous perturbation stochastic approximation (SPSA) and the deterministic method of Broydon-Fletcher-Goldfarb-Shanno (BFGS) is developed ...

Xing, X.Q.

53

Advanced numerical methods in mesh generation and mesh adaptation  

SciTech Connect (OSTI)

Numerical solution of partial differential equations requires appropriate meshes, efficient solvers and robust and reliable error estimates. Generation of high-quality meshes for complex engineering models is a non-trivial task. This task is made more difficult when the mesh has to be adapted to a problem solution. This article is focused on a synergistic approach to the mesh generation and mesh adaptation, where best properties of various mesh generation methods are combined to build efficiently simplicial meshes. First, the advancing front technique (AFT) is combined with the incremental Delaunay triangulation (DT) to build an initial mesh. Second, the metric-based mesh adaptation (MBA) method is employed to improve quality of the generated mesh and/or to adapt it to a problem solution. We demonstrate with numerical experiments that combination of all three methods is required for robust meshing of complex engineering models. The key to successful mesh generation is the high-quality of the triangles in the initial front. We use a black-box technique to improve surface meshes exported from an unattainable CAD system. The initial surface mesh is refined into a shape-regular triangulation which approximates the boundary with the same accuracy as the CAD mesh. The DT method adds robustness to the AFT. The resulting mesh is topologically correct but may contain a few slivers. The MBA uses seven local operations to modify the mesh topology. It improves significantly the mesh quality. The MBA method is also used to adapt the mesh to a problem solution to minimize computational resources required for solving the problem. The MBA has a solid theoretical background. In the first two experiments, we consider the convection-diffusion and elasticity problems. We demonstrate the optimal reduction rate of the discretization error on a sequence of adaptive strongly anisotropic meshes. The key element of the MBA method is construction of a tensor metric from hierarchical edge-based error estimates. We conclude that the quasi-optimal mesh must be quasi-uniform in this metric. All numerical experiments are based on the publicly available Ani3D package, the collection of advanced numerical instruments.

Lipnikov, Konstantine [Los Alamos National Laboratory; Danilov, A [MOSCOW, RUSSIA; Vassilevski, Y [MOSCOW, RUSSIA; Agonzal, A [UNIV OF LYON

2010-01-01T23:59:59.000Z

54

Method for nonlinear optimization for gas tagging and other systems  

DOE Patents [OSTI]

A method and system are disclosed for providing nuclear fuel rods with a configuration of isotopic gas tags. The method includes selecting a true location of a first gas tag node, selecting initial locations for the remaining n-1 nodes using target gas tag compositions, generating a set of random gene pools with L nodes, applying a Hopfield network for computing on energy, or cost, for each of the L gene pools and using selected constraints to establish minimum energy states to identify optimal gas tag nodes with each energy compared to a convergence threshold and then upon identifying the gas tag node continuing this procedure until establishing the next gas tag node until all remaining n nodes have been established. 6 figs.

Chen, T.; Gross, K.C.; Wegerich, S.

1998-01-06T23:59:59.000Z

55

Method for nonlinear optimization for gas tagging and other systems  

DOE Patents [OSTI]

A method and system for providing nuclear fuel rods with a configuration of isotopic gas tags. The method includes selecting a true location of a first gas tag node, selecting initial locations for the remaining n-1 nodes using target gas tag compositions, generating a set of random gene pools with L nodes, applying a Hopfield network for computing on energy, or cost, for each of the L gene pools and using selected constraints to establish minimum energy states to identify optimal gas tag nodes with each energy compared to a convergence threshold and then upon identifying the gas tag node continuing this procedure until establishing the next gas tag node until all remaining n nodes have been established.

Chen, Ting (Chicago, IL); Gross, Kenny C. (Bolingbrook, IL); Wegerich, Stephan (Glendale Heights, IL)

1998-01-01T23:59:59.000Z

56

Generator coordinate method for the multicluster system  

Science Journals Connector (OSTI)

We have introduced a new "hole" formulation by using two rules for deriving the generator coordinate method kernels of the multicluster system with any cluster partitions. The uniform formulae for the overlap kernel, kinetic energy kernel, and potential energy kernel given in this paper can be used easily and are available for computing codes without any further treatment. We have used them to calculate the binding energies of 1p shell nuclei and 1p shell ? hypernuclei.NUCLEAR STRUCTURE Derived formulae of kernels. Calculated binding energies of 1p shell nuclei, ? hypernuclei.

Shi Yi-jin

1983-12-01T23:59:59.000Z

57

survey of trust-region derivative free optimization methods  

E-Print Network [OSTI]

result of large and expensive computer simulation for which the source code is either not ... The main criterion for assessment and comparison of DFO algorithms is the number ..... a black-box optimization routine in optimizing energy systems [17] and for the .... Optimization Methods and Software, 20 (2005)

2007-06-14T23:59:59.000Z

58

Optimization Methods for Binary Sequences The Merit Factor Problem  

E-Print Network [OSTI]

Optimization Methods for Binary Sequences ­ The Merit Factor Problem Ron Ferguson, Joshua Knauer SFU MOCAA Project Leader: Peter Borwein MITACS 6th Annual Conference, May, 2005 Abstract Optimization of much interest in combinatorial optimization, communications engineering, and analytic number theory

59

Tutorial: Bayesian Methods for Global and Simulation Optimization  

E-Print Network [OSTI]

Tutorial: Bayesian Methods for Global and Simulation Optimization Peter I. Frazier Operations Charlotte, NC #12;Outline 1 Introduction 2 Gaussian Process Regression 3 Noise-Free Global Optimization Expected Improvement Where is it Useful? Knowledge-Gradient 4 Noisy Global Optimization 5 Case Studies

Keinan, Alon

60

Gradient-based Methods for Production Optimization of Oil Reservoirs  

E-Print Network [OSTI]

Gradient-based Methods for Production Optimization of Oil Reservoirs Eka Suwartadi Doctoral Thesis oil reservoirs. Gradient- based optimization, which utilizes adjoint-based gradient computation optimization for water flooding in the secondary phase of oil recovery is the main topic in this thesis

Foss, Bjarne A.

Note: This page contains sample records for the topic "generation optimization methods" 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

An adaptive accelerated first-order method for convex optimization  

E-Print Network [OSTI]

Aug 3, 2012 ... Abstract: This paper presents a new accelerated variant of Nesterov's method for solving composite convex optimization problems in which ...

Renato D. C. Monteiro

2012-08-03T23:59:59.000Z

62

E-Print Network 3.0 - activity optimization method Sample Search...  

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

optimization method Search Powered by Explorit Topic List Advanced Search Sample search results for: activity optimization method Page: << < 1 2 3 4 5 > >> 1 Optimization 1-1...

63

An Optimized Autoregressive Forecast Error Generator for Wind and Load Uncertainty Study  

SciTech Connect (OSTI)

This paper presents a first-order autoregressive algorithm to generate real-time (RT), hour-ahead (HA), and day-ahead (DA) wind and load forecast errors. The methodology aims at producing random wind and load forecast time series reflecting the autocorrelation and cross-correlation of historical forecast data sets. Five statistical characteristics are considered: the means, standard deviations, autocorrelations, and cross-correlations. A stochastic optimization routine is developed to minimize the differences between the statistical characteristics of the generated time series and the targeted ones. An optimal set of parameters are obtained and used to produce the RT, HA, and DA forecasts in due order of succession. This method, although implemented as the first-order regressive random forecast error generator, can be extended to higher-order. Results show that the methodology produces random series with desired statistics derived from real data sets provided by the California Independent System Operator (CAISO). The wind and load forecast error generator is currently used in wind integration studies to generate wind and load inputs for stochastic planning processes. Our future studies will focus on reflecting the diurnal and seasonal differences of the wind and load statistics and implementing them in the random forecast generator.

De Mello, Phillip; Lu, Ning; Makarov, Yuri V.

2011-01-17T23:59:59.000Z

64

Hydrofoil shape optimization by gradient methods  

E-Print Network [OSTI]

A study was carried out to develop and test techniques for the computational optimization of hydrofoil sections and lifting surfaces advancing under a free surface. A mathematical model was developed based on the extension ...

Tozzi, Gregory Michael

2004-01-01T23:59:59.000Z

65

Biomedical signal processing --application of optimization methods for machine learning  

E-Print Network [OSTI]

Biomedical signal processing -- application of optimization methods for machine learning problems Helmholtz Zentrum M¨unchen http://cmb.helmholtz-muenchen.de Grenoble, 16-Sep-2008 F. Theis Biomedical signal Biomedical signal processing -- application of optimization methods for machi #12;Data mining cocktail

Absil, Pierre-Antoine

66

Cost–Performance Analysis and Optimization of Fuel-Burning Thermoelectric Power Generators  

Science Journals Connector (OSTI)

Energy cost analysis and optimization of thermoelectric (TE) power generators burning fossil fuel show a lower initial cost ... The produced heat generates electric power. Unlike waste heat recovery systems, the ...

Kazuaki Yazawa; Ali Shakouri

2013-07-01T23:59:59.000Z

67

Optimal planning of distributed generation systems in distribution system: A review  

Science Journals Connector (OSTI)

This paper attempts to present the state of art of research work carried out on the optimal planning of distributed generation (DG) systems under different aspects. There are number of important issues to be considered while carrying out studies related to the planning and operational aspects of DG. The planning of the electric system with the presence of DG requires the definition of several factors, such as: the best technology to be used, the number and the capacity of the units, the best location, the type of network connection, etc. The impact of DG in system operating characteristics, such as electric losses, voltage profile, stability and reliability needs to be appropriately evaluated. For that reason, the use of an optimization method capable of indicating the best solution for a given distribution network can be very useful for the system planning engineer, when dealing with the increase of DG penetration that is happening nowadays. The selection of the best places for installation and the preferable size of the DG units in large distribution systems is a complex combinatorial optimization problem. This paper aims at providing a review of the relevant aspects related to DG and its impact that DG might have on the operation of distributed networks. This paper covers the review of basics of DG, DG definition, current status of DG technologies, potential advantages and disadvantages, review for optimal placement of DG systems, optimizations techniques/methodologies used in optimal planning of DG in distribution systems. An attempt has been made to judge that which methodologies/techniques are suitable for optimal placement of DG systems based on the available literature and detail comparison(s) of each one.

Rajkumar Viral; D.K. Khatod

2012-01-01T23:59:59.000Z

68

Optimization of biochemical systems through mathematical programming: Methods and applications  

Science Journals Connector (OSTI)

In this work we present a general (mono and multiobjective) optimization framework for the technological improvement of biochemical systems. The starting point of the method is a mathematical model in ordinary differential equations (ODEs) of the investigated ... Keywords: Biochemical systems, Generalized mass action, Geometric programming, Linear programming, Multiobjective optimization, Power-law formalism, S-systems

Julio Vera; Carlos González-Alcón; Alberto Marín-Sanguino; Néstor Torres

2010-08-01T23:59:59.000Z

69

Optimization Online - Composite Proximal Bundle Method  

E-Print Network [OSTI]

Jul 30, 2009 ... Composite Proximal Bundle Method. Claudia Sagastizabal (sagastiz ***at*** impa.br). Abstract: We consider minimization of nonsmooth ...

Claudia Sagastizabal

2009-07-30T23:59:59.000Z

70

Optimization of sequential attractor-based movement for compact behaviour generation  

E-Print Network [OSTI]

Optimization of sequential attractor-based movement for compact behaviour generation Marc Toussaint optimal robot motion based on a sequence of attractor dynamics in task space. This is motivated] ­ and by the need for compact movement representations on which efficient optimization can be performed. We

Toussaint, Marc

71

Control #15421 In this paper we present a method of optimally scheduling trips travelling down  

E-Print Network [OSTI]

Control #15421 SUMMARY In this paper we present a method of optimally scheduling trips travelling of trips as parameters and generates a schedule that maximizes the number of trips and determines when each schedule in which human interactions are minimized. Starting with a mathematically derived upper bound

Morrow, James A.

72

A multilevel, level-set method for optimizing eigenvalues in shape design problems  

E-Print Network [OSTI]

) where L is a self adjoint differential elliptic operator and S is a space such that can have values with respect to the parameters we seek and this generates a considerable complication that had lead to semi for the model problem we solve here. All the methods known to us for eigenvalue optimization use the eigen

Soatto, Stefano

73

A numerical study for the optimal arrangement of ocean current turbine generators in the ocean current power parks  

Science Journals Connector (OSTI)

The present paper deals with the investigation of the flow distribution in the ocean current power park in order to optimize the arrangement of the turbine generators in the sea and the lake sides. To produce more reliable results, the detailed geometry of the ocean current generators is included in the computational domain with frozen rotor method to consider rotating effect. The numerical results show the details of flow distribution in the ocean current power park and propose the appropriate arrangement of the turbine generators for the efficient operation, which is essential for possible maximum power generation.

Seung Ho Lee; Sang Hyuk Lee; Kyungsoo Jang; Jungeun Lee; Nahmkeon Hur

2010-01-01T23:59:59.000Z

74

Optimization Online - Accelerated Linearized Bregman Method  

E-Print Network [OSTI]

Jun 27, 2011 ... Abstract: In this paper, we propose and analyze an accelerated linearized Bregman (ALB) method for solving the basis pursuit and related ...

Bo Huang

2011-06-27T23:59:59.000Z

75

Apparatus and method for generating mechanical waves  

DOE Patents [OSTI]

Mechanical waves are generated in a medium by subjecting an electromechanical element to an alternating electric field having a frequency which induces mechanical resonance therein and is below any electrical resonance frequency thereof.

Allensworth, Dwight L. (Albuquerque, NM); Chen, Peter J. (Albuquerque, NM)

1985-01-01T23:59:59.000Z

76

Composite Proximal Bundle Method - Optimization Online  

E-Print Network [OSTI]

[Ous00], [MS05], [Nes07], and the V-space identification method in [DSS09]. ...... bulk of BFGS too much (at least when compared to applying directly CBun).

2011-04-26T23:59:59.000Z

77

Continuous Optimization Methods for Structure Alignments  

E-Print Network [OSTI]

Jan 30, 2006 ... speed. Additional experiments on binding site identification, ligand and cofactor alignments .... For measuring similarity between two structures one needs to translate and rotate ... method, it sheds light on complexity issues.

2006-01-30T23:59:59.000Z

78

Application of particle swarm optimization for distribution feeder reconfiguration considering distributed generators  

Science Journals Connector (OSTI)

In many countries the power systems are going to move toward creating a competitive structure for selling and buying electrical energy. These changes and the numerous advantages of the distributed generation units (DGs) in term of their technology enhancement and economical considerations have created more incentives to use these kinds of generators than before. Therefore, it is necessary to study the impact of \\{DGs\\} on the power systems, especially on the distribution networks. The distribution feeder reconfiguration (DFR) is one of the most important control schemes in the distribution networks, which can be affected by DGs. This paper presents a new approach to DFR at the distribution networks considering DGs. The main objective of the DFR is to minimize the deviation of the bus voltage, the number of switching operations and the total cost of the active power generated by \\{DGs\\} and distribution companies. Since the DFR is a nonlinear optimization problem, we apply the particle swarm optimization (PSO) approach to solve it. The feasibility of the proposed approach is demonstrated and compared with other evolutionary methods such as genetic algorithm (GA), Tabu search (TS) and differential evolution (DE) over a realistic distribution test system.

J. Olamaei; T. Niknam; G. Gharehpetian

2008-01-01T23:59:59.000Z

79

Robot Locomotion Controller Generation Through Human-Inspired Optimization  

E-Print Network [OSTI]

This thesis presents an approach to the formal design, optimization and implementation of bipedal robotic walking controllers, with experimental application on two biped platforms. Standard rigid-body modeling is used to construct a hybrid sys- tem...

Powell, Matthew Joseph

2013-11-13T23:59:59.000Z

80

Distributed Generation Dispatch Optimization under Various Electricity Tariffs  

E-Print Network [OSTI]

are nearly identical to the load-follow results; i.e. , theare lower than under either load-follow or no-DG, suggestingcost (k$/month) no DG load follow optimal month Figure 7.

Firestone, Ryan; Marnay, Chris

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "generation optimization methods" 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

Distributed Generation Dispatch Optimization under Various Electricity Tariffs  

E-Print Network [OSTI]

CPP tariffs is simply load-following. Optimal control underThe system uses a load-following control; i.e. , theefficiency of this load-following control strategy by

Firestone, Ryan; Marnay, Chris

2007-01-01T23:59:59.000Z

82

Optimization of the second-generation heliostat and specification  

SciTech Connect (OSTI)

A study was performed to investigate and identify heliostat cost reductions that would result from modifications to the Sandia Second Generation Heliostat Specification. A parametric analysis of specification requirements and cost benefits was done by determining the effectiveness of the change in terms of heliostat field cost per unit intercepted annual energy on the receiver. The study considered the areas of reduced operational wind requirements, effects of heliostat beam pointing the beam quality requirements, operational range temperature effects, survival wind requirements and criteria, aspect ratio effects, and slew rates. Also considered were the effects of mixing two heliostats with different performance levels in the 50 MWe field and a damage/cost estimate for survival of the baseline heliostat to higher wind loads than the specification. An investigation and analysis of the safety issues associated with beam control during normal heliostat operating and stow conditions was performed using analytical equations for both single and multiple heliostats. Effort in this area was directed toward determining feasibility and implementation methods for safe face-up stow strategies. (LEW)

Dietrich, J.J.; Knowles, R.K.; Stone, K.W.; Steinmeyer, D.A.; Nourse, J.H.

1982-05-01T23:59:59.000Z

83

Method and system for radioisotope generation  

DOE Patents [OSTI]

A system and a process for producing selected isotopic daughter products from parent materials characterized by the steps of loading the parent material upon a sorbent having a functional group configured to selectively bind the parent material under designated conditions, generating the selected isotopic daughter products, and eluting said selected isotopic daughter products from the sorbent. In one embodiment, the process also includes the step of passing an eluent formed by the elution step through a second sorbent material that is configured to remove a preselected material from said eluent. In some applications a passage of the material through a third sorbent material after passage through the second sorbent material is also performed.

Toth, James J.; Soderquist, Chuck Z.; Greenwood, Lawrence R.; Mattigod, Shas V.; Fryxell, Glen E.; O'Hara, Matthew J.

2014-07-15T23:59:59.000Z

84

Self-consistent generator coordinate method  

Science Journals Connector (OSTI)

An optimum continuous representation technique derived in analogy with the self-consistent harmonic approximation in quantum lattice dynamics is discussed and applied to Lipkin's model. The method is based on the variational principle and corresponds to an infinite summation of an expansion of the appropriate Hamiltonian kernel. The overlap kernel is treated exactly. The actual results indicate the removal of the drawbacks of low order perturbation theory previously employed in this connection.NUCLEAR STRUCTURE Continuous representation method applied to a solvable model.

Bernard Laskowski and Erkki Brändas

1976-04-01T23:59:59.000Z

85

Derivative-Free Optimization Proximal Point Methods Derivative-Free Proximal Point Conclusion Derivative-Free Optimization via Proximal  

E-Print Network [OSTI]

Derivative-Free Optimization Proximal Point Methods Derivative-Free Proximal Point Conclusion Derivative-Free Optimization via Proximal Point Methods Yves Lucet & Warren Hare July 24, 2013 1 / 26 #12;Derivative-Free Optimization Proximal Point Methods Derivative-Free Proximal Point Conclusion Outline 1

86

Relationship between the semiclassical and the generator coordinate methods  

Science Journals Connector (OSTI)

Using a very simple type of wave packet, which is obtained by letting unitary displacement operators having as generators canonical operators Q^ and P^ in the many-body Hilbert space act on a reference state, we investigate the relationship between the semiclassical and the generator coordinate methods. The semiclassical method is based on the time-dependent variational principle, whereas in the generator coordinate method the wave packets are taken as generator states. To establish the equivalence of the two methods, we examine in detail, using tools developed in previous works, the concept of redundancy of the wave packet and the importance of the zero-point energy effects. We make a numerical application to the case of the Goldhaber-Teller mode in He4.[NUCLEAR STRUCTURE Relationship between the semiclassical and the generator coordinate methods. Redundancy and zero-point energy effects. Numerical application to the Goldhaber-Teller mode in He4.

E. J. V. de Passos and F. F. de Souza Cruz

1981-08-01T23:59:59.000Z

87

Optimal Trajectory Generation in Ocean Flows Tamer Inanc, Shawn C. Shadden and Jerrold E. Marsden  

E-Print Network [OSTI]

currents to help propel the gliders around the ocean for sustainable missions. The idea of exploitingOptimal Trajectory Generation in Ocean Flows Tamer Inanc, Shawn C. Shadden and Jerrold E. Marsden near optimal trajectories for autonomous underwater gliders in a dynamic ocean environment. This opens

Marsden, Jerrold

88

Automatic and interactive e-Learning auxiliary material generation utilizing particle swarm optimization  

Science Journals Connector (OSTI)

The purpose of this research was to utilize a PSO-based algorithm, serial blog article composition particle swarm optimization (SBACPSO) algorithm, to automatically and intelligently generate auxiliary materials. Contrary to previous fixed content auxiliary ... Keywords: Auxiliary material, RSS, Serial blog articles composition particle swarm optimization, e-Learning

Tien-Chi Huang; Yueh-Min Huang; Shu-Chen Cheng

2008-11-01T23:59:59.000Z

89

Study on capacity optimization of PEM fuel cell and hydrogen mixing gas-engine compound generator  

Science Journals Connector (OSTI)

Development of a small-scale power source not dependent on commercial power may result in various effects. For example, it may eliminate the need for long distance power-transmission lines, and mean that the amount of green energy development is not restricted to the dynamic characteristics of a commercial power grid. Moreover, the distribution of the independent energy source can be optimized with regionality in mind. This paper examines the independent power supply system relating to hydrogen energy. Generally speaking, the power demand of a house tends to fluctuate considerably over the course of a day. Therefore, when introducing fuel cell cogeneration into an apartment house, etc., low-efficiency operations in a low-load region occur frequently in accordance with load fluctuation. Consequently, the hybrid cogeneration system (HCGS) that uses a solid polymer membrane-type fuel cell (PEM-FC) and a hydrogen mixture gas engine (NEG) together to improve power generation efficiency during partial load of fuel cell cogeneration is proposed. However, since facility costs increase, if the HCGS energy cost is not low compared with the conventional method, it is disadvantageous. Therefore, in this paper, HCGS is introduced into 10 household apartments in Tokyo, and the power generation efficiency, carbon dioxide emissions and optimal capacity of a boiler and heat storage tank are investigated through analysis. Moreover, the system characteristics change significantly based on the capacity of PEM-FC and NEG that compose HCGS. Therefore, in this study, the capacity of PEM-FC and that of NEG are investigated, as well as the power generation efficiency, carbon dioxide emissions and the optimal capacity of a boiler and heat storage tank. Analysis revealed that the annual average power generation efficiency when the capacity of PEM-FC and NEG is 5 kW was 27.3%. Meanwhile, the annual average power generation efficiency of HCGS is 1.37 times that of the PEM-FC independent system, and 1.28 times that of the NEG independent system, respectively.

Shin’ya Obara; Itaru Tanno

2007-01-01T23:59:59.000Z

90

Method for using global optimization to the estimation of surface-consistent residual statics  

DOE Patents [OSTI]

An efficient method for generating residual statics corrections to compensate for surface-consistent static time shifts in stacked seismic traces. The method includes a step of framing the residual static corrections as a global optimization problem in a parameter space. The method also includes decoupling the global optimization problem involving all seismic traces into several one-dimensional problems. The method further utilizes a Stochastic Pijavskij Tunneling search to eliminate regions in the parameter space where a global minimum is unlikely to exist so that the global minimum may be quickly discovered. The method finds the residual statics corrections by maximizing the total stack power. The stack power is a measure of seismic energy transferred from energy sources to receivers.

Reister, David B. (Knoxville, TN); Barhen, Jacob (Oak Ridge, TN); Oblow, Edward M. (Knoxville, TN)

2001-01-01T23:59:59.000Z

91

On Optimization of Reliability of Distributed Generation-Enhanced Feeders  

Science Journals Connector (OSTI)

Placement of protection devices in a conventionalfeeder (without distributed generation) is often performedso as to minimize traditional reliability indices (SAIDI,SAIFI, MAIFIe...), assuming the sole source(s) of energyat substation(s). Distributed ...

A. Pregelj; M. Begovic; A. Rohatgi; D. Novosel

2003-01-01T23:59:59.000Z

92

Optimization Online - Simultaneous Column-and-Row Generation ...  

E-Print Network [OSTI]

Nov 14, 2010 ... Abstract: In this paper, we develop a simultaneous column-and-row generation algorithm that could be applied to a general class of large-scale ...

Ibrahim Muter

2010-11-14T23:59:59.000Z

93

A Method for Evaluating Volt-VAR Optimization Field Demonstrations  

SciTech Connect (OSTI)

In a regulated business environment a utility must be able to validate that deployed technologies provide quantifiable benefits to the end-use customers. For traditional technologies there are well established procedures for determining what benefits will be derived from the deployment. But for many emerging technologies procedures for determining benefits are less clear and completely absent in some cases. Volt-VAR Optimization is a technology that is being deployed across the nation, but there are still numerous discussions about potential benefits and how they are achieved. This paper will present a method for the evaluation, and quantification of benefits, for field deployments of Volt-VAR Optimization technologies. In addition to the basic methodology, the paper will present a summary of results, and observations, from two separate Volt-VAR Optimization field evaluations using the proposed method.

Schneider, Kevin P.; Weaver, T. F.

2014-08-31T23:59:59.000Z

94

Fossil fuel combined cycle power generation method  

DOE Patents [OSTI]

A method for converting fuel energy to electricity includes the steps of converting a higher molecular weight gas into at least one mixed gas stream of lower average molecular weight including at least a first lower molecular weight gas and a second gas, the first and second gases being different gases, wherein the first lower molecular weight gas comprises H.sub.2 and the second gas comprises CO. The mixed gas is supplied to at least one turbine to produce electricity. The mixed gas stream is divided after the turbine into a first gas stream mainly comprising H.sub.2 and a second gas stream mainly comprising CO. The first and second gas streams are then electrochemically oxidized in separate fuel cells to produce electricity. A nuclear reactor can be used to supply at least a portion of the heat the required for the chemical conversion process.

Labinov, Solomon D [Knoxville, TN; Armstrong, Timothy R [Clinton, TN; Judkins, Roddie R [Knoxville, TN

2008-10-21T23:59:59.000Z

95

Design method of dynamical decoupling sequences integrated with optimal control theory  

E-Print Network [OSTI]

A method for synthesizing dynamical decoupling (DD) sequences is presented, which can tailor these sequences to a given set of qubits, environments, instruments, and available resources using partial information of the system. The key concept behind the generation of the DD sequences involves not only extricating the strong dependence on the coupling strengths according to the "optimal control," but also exploiting the "refocus" technique used conventionally to obtain DD sequences. The concept is a generalized one that integrates optimal control and designing of DD sequences.

Yutaka Tabuchi; Masahiro Kitagawa

2012-08-26T23:59:59.000Z

96

The Lattice-Boltzmann Method on Optimal Sampling Lattices  

E-Print Network [OSTI]

The Lattice-Boltzmann Method on Optimal Sampling Lattices Usman R. Alim, Alireza Entezari, and Torsten Mo¨ller, Member, IEEE Abstract--In this paper, we extend the single relaxation time Lattice-Boltzmann space of the continuous Boltzmann equation as compared to the D3Q15 Cartesian lattice, it also achieves

Alim, Usman Raza

97

Method of calculation of heat generation rates for DWPF glass  

SciTech Connect (OSTI)

The Waste Acceptance Preliminary Specifications (WAPS) require estimates of the heat generation rate of DWPF waste glasses. Estimates of the heat generation rates of projected glass compositions are to be reported in the Waste Form Qualification Report. Similar estimates for actual production glasses are to be reported in the Production Records. In this report, a method of calculating the heat generation rate from the radionuclide inventory is provided. Application of the method to the DWPF Design-Basis glass indicates that the heat generation rate can be accurately estimated from the Sr-90, Y-90, Cs-137, Ba-137m, and Pu-238 contents alone.

Plodinec, M.J.

1992-03-17T23:59:59.000Z

98

Method of calculation of heat generation rates for DWPF glass  

SciTech Connect (OSTI)

The Waste Acceptance Preliminary Specifications (WAPS) require estimates of the heat generation rate of DWPF waste glasses. Estimates of the heat generation rates of projected glass compositions are to be reported in the Waste Form Qualification Report. Similar estimates for actual production glasses are to be reported in the Production Records. In this report, a method of calculating the heat generation rate from the radionuclide inventory is provided. Application of the method to the DWPF Design-Basis glass indicates that the heat generation rate can be accurately estimated from the Sr-90, Y-90, Cs-137, Ba-137m, and Pu-238 contents alone.

Plodinec, M.J.

1993-02-04T23:59:59.000Z

99

An optimized mean variance estimation method for uncertainty quantification of wind power forecasts  

Science Journals Connector (OSTI)

Abstract A statistical optimized technique for rapid development of reliable prediction intervals (PIs) is presented in this study. The mean–variance estimation (MVE) technique is employed here for quantification of uncertainties related with wind power predictions. In this method, two separate neural network models are used for estimation of wind power generation and its variance. A novel PI-based training algorithm is also presented to enhance the performance of the MVE method and improve the quality of PIs. For an in-depth analysis, comprehensive experiments are conducted with seasonal datasets taken from three geographically dispersed wind farms in Australia. Five confidence levels of \\{PIs\\} are between 50% and 90%. Obtained results show while both traditional and optimized \\{PIs\\} are hypothetically valid, the optimized \\{PIs\\} are much more informative than the traditional MVE PIs. The informativeness of these \\{PIs\\} paves the way for their application in trouble-free operation and smooth integration of wind farms into energy systems.

Abbas Khosravi; Saeid Nahavandi

2014-01-01T23:59:59.000Z

100

Biological optimization systems for enhancing photosynthetic efficiency and methods of use  

DOE Patents [OSTI]

The present disclosure relates to biological optimization systems for enhancing photosynthetic efficiency and methods of use.

Hunt, Ryan W; Chinnasamy, Senthil; Das, Keshav C; Rolim de Mattos, Erico

2014-02-25T23:59:59.000Z

Note: This page contains sample records for the topic "generation optimization methods" 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

Research on Optimal Operation Method of Large Scale Urban Water Distribution System  

Science Journals Connector (OSTI)

Abstract In consideration of using fewer decision variables in building least cost pumping operation optimal, the two-phase optimal method is used as the frame. By abstracting pump stations into high level reservoirs, the water distribution system hydraulic model can be modified into a modality, which can be used in first optimal phase of two-phase optimal method. And by building on feasible pump combination database, a new optimal method in the second optimal phase will be proposed. And the proposed new method in the second optimal phase will be embedded into the first optimal phase, so that the problem of results discordant in different phases of two-phase optimal method will be solved. By introducing new concept and improving present optimal method, a more practical optimal operation method of water distribution system (WDS) will be established. By applying to a large scale water distribution system, the practicability of proposed method has been evaluated.

X. Jin; W. Wu

2014-01-01T23:59:59.000Z

102

Performance Optimization of a Photovoltaic Generator with an Active Power Filter Application  

E-Print Network [OSTI]

1 Performance Optimization of a Photovoltaic Generator with an Active Power Filter Application (MPPT) for photovoltaic (PV) systems maximizes the power that can be transferred from the PV system), a constant voltage on the DC side of the inverter was proposed, it is a photovoltaic generator which is used

Paris-Sud XI, Université de

103

Design and Optimization of Compatible, Segmented Thermoelectric Generators  

E-Print Network [OSTI]

to rationally select materials for a segmented thermoelectric generator. The thermoelectric potential is used for the exact analytic expressions for materials with temperature dependent thermoelectric properties C H T T = . The thermoelectric material governs how close the efficiency can be to Carnot primarily

104

OPTIMAL DISTRIBUTED POWER GENERATION UNDER NETWORK LOAD CONSTRAINTS,  

E-Print Network [OSTI]

-producers. Decentralized Power Generation (DPG) refers to an electric power source such as solar, wind or combined heat (the approach used in the traditional electric power paradigm), DPG systems employ numerous, but small¨EL BLOEMHOF, JOOST BOSMAN§, DAAN CROMMELIN¶, JASON FRANK , AND GUANGYUAN YANG Abstract. In electrical power

Frank, Jason

105

Generator coordinate method approach to the dynamic group representation  

Science Journals Connector (OSTI)

The generator coordinate method approach to the dynamic group representation is discussed in general. In various cases, either in group space or in coset space, representations of the dynamic group can readily be obtained with the generator coordinate method. Boson representation is just one form of the generator coordinate method approach to the dynamic group representation. Various representations of the dynamic group are described by the generator coordinate method approach to the dynamic group representation in a unified way. Not only is the algebraic structure of generators preserved, but also conditions imposed by (a) the Pauli principle, (b) symmetry properties, (c) dynamic properties, and (d) other concrete properties of nuclear systems are well incorporated in these representations, so that the original fermion representation is faithfully realized. The generator coordinate method approach to the dynamic group representation is strictly a transformation theory from the fermion representation to continuous variable or boson representations of the dynamic group. Examples are given for showing the essence and the prospects of applications of the generator coordinate method approach to the dynamic group representation.

Xu Gong-ou; Wang Shun-jin; Yang Ya-tian

1987-11-01T23:59:59.000Z

106

Calculation Method of Losses and Efficiency of Wind Generators  

Science Journals Connector (OSTI)

In the methods presented in this chapter, wind speed is used as the input data, ... conditions of the WG system, for example, wind turbine output, generator output, output power to the power grid, and various los...

Junji Tamura

2012-01-01T23:59:59.000Z

107

Optimal Power Sharing for Microgrid with Multiple Distributed Generators  

Science Journals Connector (OSTI)

Abstract This paper describes the active power sharing of multiple distributed generators (DGs) in a microgrid. The operating modes of a microgrid are 1) a grid-connected mode and 2) an autonomous mode. During islanded operation, one DG unit should share its output power with other DG units in exact accordance with the load. Unit output power control (UPC) is introduced to control the active power of DGs. The viability of the proposed power control mode is simulated by MATLAB/SIMULINK.

V. Logeshwari; N. Chitra; A. Senthil Kumar; Josiah Munda

2013-01-01T23:59:59.000Z

108

Optimal command generation for maneuvering the space station  

E-Print Network [OSTI]

with linearly appearing bounded controls. It was shown that on average, the run time for the control eliminated differential inclusion method was one-sixth that of the collocation method. ' One method y'ves a higher accuracy, while the other gives faster... and positive in the direction of vehicle motion. The z-axis points to the nadir, and the y-axis is normal to the orbit plane and completes the right-handed orthogonal system. 15 This can be seen in Figure 2. 2. The angular velocity of LVLH relative...

Bryson, Amy Louise

2012-06-07T23:59:59.000Z

109

15.053 Optimization Methods in Management Science, Spring 2007  

E-Print Network [OSTI]

15.053 introduces students to the theory, algorithms, and applications of optimization. Optimization methodologies include linear programming, network optimization, integer programming, decision trees, and dynamic programming. ...

Mamani, Hamed

110

Heuristic search method for optimal zonation of well logs  

SciTech Connect (OSTI)

Optimal zonation of well-log data, that is, determining an optimal number of major segments such as waveforms in a log, may be achieved by employing a criterion of minimum variance (within a segment) and a heuristic search of potential boundary (link) points of digitized log data. This new method is based on an algorithm originally devised by D.M. Hawkins and D.F. Merriam in 1973. Their method can be improved by introducing a heuristic search procedure, thereby decreasing computer time by 7- to 50-fold, depending on the number of data points and configuration of the logs. Time saving is proportional to the size of the data set. Three examples - one hypothetical and two real-are used to illustrate the modification of the Hawkins and Merriam algorithm.

Chen, H.C.; Fang, J.H.

1986-07-01T23:59:59.000Z

111

Method for measuring energy generation and efficiency of dielectric elastomer generators  

E-Print Network [OSTI]

Method for measuring energy generation and efficiency of dielectric elastomer generators Rainer. The measured mechanical to electrical energy conversion efficiency is 7:5%. The experiment may be used into electrical energy at high energy density, showing promise for large and small scale energy harvesting. We

Suo, Zhigang

112

Control and optimization system and method for chemical looping processes  

DOE Patents [OSTI]

A control system for optimizing a chemical loop system includes one or more sensors for measuring one or more parameters in a chemical loop. The sensors are disposed on or in a conduit positioned in the chemical loop. The sensors generate one or more data signals representative of an amount of solids in the conduit. The control system includes a data acquisition system in communication with the sensors and a controller in communication with the data acquisition system. The data acquisition system receives the data signals and the controller generates the control signals. The controller is in communication with one or more valves positioned in the chemical loop. The valves are configured to regulate a flow of the solids through the chemical loop.

Lou, Xinsheng; Joshi, Abhinaya; Lei, Hao

2014-06-24T23:59:59.000Z

113

One directional Polarized Neutron Reflectometry with optimized reference layer method  

E-Print Network [OSTI]

In the past decade, several neutron reflectometry methods for determining the modulus and phase of the complex reflection coefficient of an unknown multilayer thin film have been worked out among which the method of variation of surroundings and reference layers are of highest interest. These methods were later modified for measurement of the polarization of the reflected beam instead of the measurement of the intensities. In their new architecture, these methods not only suffered from the necessity of change of experimental setup, but also another difficulty was added to their experimental implementations. This deficiency was related to the limitations of the technology of the neutron reflectometers that could only measure the polarization of the reflected neutrons in the same direction as the polarization of the incident beam. As the instruments are limited, the theory has to be optimized so that the experiment could be performed. In a recent work, we developed the method of variation of surroundings for one directional polarization analysis. In this new work, the method of reference layer with polarization analysis has been optimized to determine the phase and modulus of the unknown film with measurement of the polarization of the reflected neutrons in the same direction as the polarization of the incident beam.

Seyed Farhad Masoudi; Saeed S. Jahromi

2012-05-17T23:59:59.000Z

114

One directional polarized neutron reflectometry with optimized reference layer method  

SciTech Connect (OSTI)

In the past decade, several neutron reflectometry methods for determining the modulus and phase of the complex reflection coefficient of an unknown multilayer thin film have been worked out among which the method of variation of surroundings and reference layers are of highest interest. These methods were later modified for measurement of the polarization of the reflected beam instead of the measurement of the intensities. In their new architecture, these methods not only suffered from the necessity of change of experimental setup but also another difficulty was added to their experimental implementations. This deficiency was related to the limitations of the technology of the neutron reflectometers that could only measure the polarization of the reflected neutrons in the same direction as the polarization of the incident beam. As the instruments are limited, the theory has to be optimized so that the experiment could be performed. In a recent work, we developed the method of variation of surroundings for one directional polarization analysis. In this new work, the method of reference layer with polarization analysis has been optimized to determine the phase and modulus of the unknown film with measurement of the polarization of the reflected neutrons in the same direction as the polarization of the incident beam.

Masoudi, S. Farhad; Jahromi, Saeed S. [Department of Physics, K.N. Toosi University of Technology, P.O. Box 15875-4416, Tehran (Iran, Islamic Republic of)

2012-09-01T23:59:59.000Z

115

Optimization of Water Consumption in Second Generation Bioethanol Plants  

E-Print Network [OSTI]

the treatment and recycling of wastewater. 7 In the recent past systematic methods for minimizing water of the ethanol production processes are designed by determining water consumption, reuse and recycle and wastewater treatment an important topic with new economic incentives for implementing technologies

Grossmann, Ignacio E.

116

One directional Polarized Neutron Reflectometry with optimized reference layer method  

E-Print Network [OSTI]

In the past decade, several neutron reflectometry methods for determining the modules and phase of complex reflection coefficient of an unknown multilayer thin film have been worked out among which the method of variation of surroundings and reference layers are of highest interest. These methods were later modified for measurement of polarization of reflected beam instead of the measurement of intensities. In their new architecture, these methods not only suffered from the necessity of change of experimental setup, but also another difficulty was added to their experimental implementations which was related to the limitations of the technology of the neutron reflectometers that could only measure the polarization of the reflected neutrons in the same direction as the polarization of the incident beam. As the instruments are limited, the theory has to be optimized so that the experiment could be performed. In a recent work, we have developed the method of variation of surroundings for one directional polariza...

Masoudi, Seyed Farhad

2012-01-01T23:59:59.000Z

117

Method for Determining Optimal Residential Energy Efficiency Retrofit Packages  

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

Method for Determining Method for Determining Optimal Residential Energy Efficiency Retrofit Packages B. Polly, M. Gestwick, M. Bianchi, R. Anderson, S. Horowitz, C. Christensen, and R. Judkoff National Renewable Energy Laboratory April 2011 ii NOTICE This report was prepared as an account of work sponsored by an agency of the United States government. Neither the United States government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process,

118

Optimal control for variable-speed wind generation systems using General Regression Neural Network  

Science Journals Connector (OSTI)

Abstract An induction generator (IG) speed drive with the application of an optimal controller and a proposed General Regression Neural Network (GRNN) controller is introduced in this paper. Grid connected wind energy conversion system (WECS) present interesting control demands, due to the intrinsic nonlinear characteristic of wind mills and electric generators. The GRNN with adaptive ant colony optimization (AACO) torque compensation is feed-forward to increase the robustness of the wind driven induction generator system. An optimal control loop for the wind power system is designed. The optimality of the whole system is defined in relation with the trade-off between the wind energy conversion maximization and the minimization of the induction generator torque variation that is responsible for the frequency fluctuations. This is achieved by using a combined optimization criterion, resulting in a LQ tracking problem with an infinite horizon and a measurable exogenous variable (wind speed). The proposed controller is designed to drive the turbine speed to extract maximum power from the wind and adjust to the power regulation.

Chih-Ming Hong; Fu-Sheng Cheng; Chiung-Hsing Chen

2014-01-01T23:59:59.000Z

119

Iterative optimizing quantization method for reconstructing three-dimensional images from a limited number of views  

DOE Patents [OSTI]

A three-dimensional image reconstruction method comprises treating the object of interest as a group of elements with a size that is determined by the resolution of the projection data, e.g., as determined by the size of each pixel. One of the projections is used as a reference projection. A fictitious object is arbitrarily defined that is constrained by such reference projection. The method modifies the known structure of the fictitious object by comparing and optimizing its four projections to those of the unknown structure of the real object and continues to iterate until the optimization is limited by the residual sum of background noise. The method is composed of several sub-processes that acquire four projections from the real data and the fictitious object: generate an arbitrary distribution to define the fictitious object, optimize the four projections, generate a new distribution for the fictitious object, and enhance the reconstructed image. The sub-process for the acquisition of the four projections from the input real data is simply the function of acquiring the four projections from the data of the transmitted intensity. The transmitted intensity represents the density distribution, that is, the distribution of absorption coefficients through the object.

Lee, Heung-Rae (Dublin, CA)

1997-01-01T23:59:59.000Z

120

Next-generation dialyser design using sustainable design methods  

Science Journals Connector (OSTI)

Life-Cycle Analysis (LCA) is used to understand the holistic flow of energy and materials throughout a product's life. As part of a comprehensive approach to design next-generation dialysers, we performed a LCA of an Optiflux F180NR dialyser. Combining LCA insights with a functional analysis of each product component, we analysed which components could be improved most effectively. Determining that the polycarbonate housing was the optimal area of focus, we used SolidWorks and COSMOSWorks to test, in-silico, the strength of various reduced-weight housing designs. The final design weighed 17% less than the original without a significant loss in strength.

Jacob Hanson; Robert Hitchcock

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "generation optimization methods" 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

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

122

Method and apparatus for generating a natural crack  

DOE Patents [OSTI]

A method and apparatus for generating a measurable natural crack includes forming a primary notch in the surface of a solid material. A nonsustained single pressure pulse is then generated in the vicinity of the primary notch, reuslting in the formation of a shock wave which travels through the material. The shock wave creates a measurable natural crack within the material which extends from the primary notch. The natural crack formed possesses predictable geometry, location and orientation.

Fulton, F.J.; Honodel, C.A.; Holman, W.R.; Weingart, R.C.

1982-05-06T23:59:59.000Z

123

Guided wave methods and apparatus for nonlinear frequency generation  

DOE Patents [OSTI]

Methods and apparatus are disclosed for the nonlinear generation of sum and difference frequencies of electromagnetic radiation propagating in a nonlinear material. A waveguide having a waveguide cavity contains the nonlinear material. Phase matching of the nonlinear generation is obtained by adjusting a waveguide propagation constant, the refractive index of the nonlinear material, or the waveguide mode in which the radiation propagates. Phase matching can be achieved even in isotropic nonlinear materials. A short-wavelength radiation source uses phase-matched nonlinear generation in a waveguide to produce high harmonics of a pulsed laser.

Durfee, III, Charles G. (Ann Arbor, MI); Rundquist, Andrew (Austin, TX); Kapteyn, Henry C. (Ann Arbor, MI); Murnane, Margaret M. (Ann Arbor, MI)

2000-01-01T23:59:59.000Z

124

Energy Conversion Unit with Optimized Waveform Generation Sally Sajadian and Euzeli C. dos Santos Jr.  

E-Print Network [OSTI]

Energy Conversion Unit with Optimized Waveform Generation Sally Sajadian and Euzeli C. dos Santos to increase the efficiency of the devices dealing with energy conversion. The power supplies devices able and interleaved converters. This paper proposes an energy conversion unit constituted by a single-phase DC

Zhou, Yaoqi

125

Concurrent Optimization of Consumer's Electrical Energy Bill and Producer's Power Generation Cost under a Dynamic Pricing  

E-Print Network [OSTI]

Concurrent Optimization of Consumer's Electrical Energy Bill and Producer's Power Generation Cost lower cost. I. INTRODUCTION There is no substitute for the status of electrical energy, which. Availability of affordable and sustainable electrical energy has been the key to prosperity and continued socio

Pedram, Massoud

126

EV3 : Traction drives and generators A: Electric machine design and optimization 1  

E-Print Network [OSTI]

EV3 : Traction drives and generators A: Electric machine design and optimization 1 Influence Electrical Machine Type B. Aslan1 , J. Korecki1 , T. Vigier1 , E. Semail1 bassel.aslan@yahoo.com, korecki according to the electrical angle e (angle between current and back-EMF vector), for different values

Boyer, Edmond

127

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

128

Relativistic optimized potential method for open-shell systems  

Science Journals Connector (OSTI)

A formulation of the relativistic optimized potential method (ROPM) within spin-density functional theory is presented. Various forms of the corresponding ROPM equations are given that allow to determine the spin-averaged and spin-dependent exchange-correlation fields. For a numerical basis-set-free implementation of the scheme, we use the exact exchange. Results are presented for a number of free atoms that demonstrate the implication of the fully relativistic approach as well as the impact of making use of the Krieger-Li-Iafarate approximation. The application of the present ROPM scheme to solids is briefly discussed.

D. Ködderitzsch, H. Ebert, and E. Engel

2008-01-02T23:59:59.000Z

129

Generator Coordinate Method framework for Double Beta Decay  

E-Print Network [OSTI]

We propose a consistent prescription for the derivation of the particle number and angular momentum projected QRPA (PQRPA) equation in the Generator Coordinate Method (GCM) framework for calculation of NME's of double-beta decay of axially deformed nuclei. We derive closed formulae for the calculation of excitation energies and wave functions of the intermediate nucleus.

Andrzej Bobyk; Wies?aw A. Kami?ski

2014-11-10T23:59:59.000Z

130

A new stochastic framework for optimal generation scheduling considering wind power sources  

Science Journals Connector (OSTI)

This paper suggests a new stochastic framework based on 2 m+1 point estimate method PEM to solve the mid-term generation scheduling SMGS problem. The new formulation makes use of an adaptive modified bat algorithm and a novel self-adaptive wavelet mutation ... Keywords: Mid-Term Generation Scheduling Mgs, Modified Bat Algorithm, Point Estimate Methods, Self-Adaptive Strategy, Wind Power Generation

Sajad Tabatabaei

2014-05-01T23:59:59.000Z

131

Isovector pairing collective motion: Generator-coordinate-method approach  

Science Journals Connector (OSTI)

Isovector pairing collective motion is treated by means of the generator coordinate method. In this scheme, the isospin and number projection is performed analytically by the recognition of symmetry properties in the generalized Bardeen-Cooper-Schrieffer wave functions. Among the results obtained, our generator-coordinate-method values of energy and spectroscopic amplitude are shown to be comparable to those of shell model calculations. This is indeed encouraging, especially in view of the fact that they were reached using a simple approximation. The great simplicity of the present method, as compared with earlier complicated versions, suggests that they might prove useful in the study of isovector pairing collective states which are strongly populated by pair transfer reactions in medium weight nuclei.

Mauro Kyotoku and Hsi-Tseng Chen

1987-09-01T23:59:59.000Z

132

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

133

Collective Motions in Nuclei by the Method of Generator Coordinates  

Science Journals Connector (OSTI)

For an A-particle system, a trial wave function is constructed of the form ?(x1, ?, xA)=??(x1, ?, xA; ?)f(?)d?. The preliminary nucleonic wave function, ?, solves the problem in a "construction potential." This potential depends upon a "deformation parameter" or "generator coordinate," ?. The collective wave function, f(?), or "generator function," is folded into ? to produce a system wave function that depends only upon the coordinates, xi, of the particles. In the integration, the deformation parameters dissolve away. They do not appear in the final state function; they only generate it. No collective coordinates ever come into use nor do such coordinates ever have to be defined. In typical cases when the generator function contains one or more nodes, it generates nodes in the system wave function ? of the kind that describe collective kinetic energy. The energy of the system is extremized with respect to choice of the generator function, f(?). No Hamiltonian ever appears except the A-particle Hamiltonian. All nucleons are treated on the same basis whether in or above closed shells. The appropriate variational calculation leads to an integral equation or "generator wave equation" for f(?). This equation is solved in two limiting cases: the quadratic approximation, and the ?-function approximation. An analysis is made of the Peierls-Yoccoz procedure to calculate the effectivemass parameter in cases where the forces acting in the system are invariant with respect to translation or rotation. There is no external machinery to drive the construction potential. The effective inertia constant does not appear likely to agree in general with that calculated for the essentially different problem of particles in such a machine-driven potential, though the latter value is presumably more nearly correct for physical applications. The trial wave function in the method of generator coordinates is designed for simplicity, not for precision. It is applied in the following paper to the dilatational and shape oscillations of O16.

James J. Griffin and John A. Wheeler

1957-10-15T23:59:59.000Z

134

Seismic wave generation systems and methods for cased wells  

DOE Patents [OSTI]

A vibration source (10) includes an armature bar (12) having a major length dimension, and a driver (20A) positioned about the armature bar. The driver (20A) is movably coupled to the armature bar (12), and includes an electromagnet (40). During operation the electromagnet (40) is activated such that the driver (20A) moves with respect to the armature bar (12) and a vibratory signal is generated in the armature bar. A described method for generating a vibratory signal in an object includes positioning the vibration source (10) in an opening of the object, coupling the armature bar (12) to a surface of the object within the opening, and activating the electromagnet (40) of the driver (20A) such that the driver moves with respect to the armature bar (12) and a vibratory signal is generated in the armature bar and the object.

Minto, James (Houston, TX); Sorrells, Martin H (Huffman, TX); Owen, Thomas E. (Helotes, TX); Schroeder, Edgar C. (San Antonio, TX)

2011-03-29T23:59:59.000Z

135

Residential Energy Management system for optimization of on-site generation  

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

Residential Energy Management system for optimization of on-site generation Residential Energy Management system for optimization of on-site generation with HVAC Speaker(s): Ram Narayanamurthy Date: October 29, 2009 - 12:00pm Location: 90-3122 As the individual movements towards Net Zero Energy Homes (NZEH) and the SmartGrid converge on residential buildings, three major challenges need to be addressed: Flatten the highly peaked electric load profile of low energy homes Provide easy integration of energy efficiency into existing homes Provide builders and consumers with visibility into building operation, and ease of management. A Home Energy Management System (HEMS) owned by the consumer, capable of two way communications with Utility DR/SmartGrid/AMI is required to resolve these challenges. The HEMS will need to increase energy efficiency of building operations, provide consumers feedback and

136

Optimizing Geographic Allotment of Photovoltaic Capacity in a Distributed Generation Setting: Preprint  

SciTech Connect (OSTI)

A multi-objective optimization was performed to allocate 2MW of PV among four candidate sites on the island of Lanai such that energy was maximized and variability in the form of ramp rates was minimized. This resulted in an optimal solution set which provides a range of geographic allotment alternatives for the fixed PV capacity. Within the optimal set, a tradeoff between energy produced and variability experienced was found, whereby a decrease in variability always necessitates a simultaneous decrease in energy. A design point within the optimal set was selected for study which decreased extreme ramp rates by over 50% while only decreasing annual energy generation by 3% over the maximum generation allocation. To quantify the allotment mix selected, a metric was developed, called the ramp ratio, which compares ramping magnitude when all capacity is allotted to a single location to the aggregate ramping magnitude in a distributed scenario. The ramp ratio quantifies simultaneously how much smoothing a distributed scenario would experience over single site allotment and how much a single site is being under-utilized for its ability to reduce aggregate variability. This paper creates a framework for use by cities and municipal utilities to reduce variability impacts while planning for high penetration of PV on the distribution grid.

Urquhart, B.; Sengupta, M.; Keller, J.

2012-09-01T23:59:59.000Z

137

Optimal energy-harvesting cycles for load-driven dielectric generators in plane strain  

E-Print Network [OSTI]

The performances of energy harvesting generators based on dielectric elastomers are investigated. The configuration is of a thin dielectric film coated by stretchable electrodes at both sides. The film is first stretched, then charged and subsequently, afterwards it is released, and finally the charge is harvested at a higher electric potential. The amount of energy extracted by this cycle is bounded by the electric breakdown and the ultimate stretch ratio of the film as well as by structural instabilities due to loss of tension. To identify the optimal cycle that complies with these limits we formulate a constraint optimization problem and solve it with a dedicated solver for two typical classes of elastic dielectrics. As anticipated, we find that the performance of the generator depends critically on the ultimate stretch ratio of the film. However, more surprising is our finding of a universal limit on the dielectric strength of the film beyond which the optimal cycle is independent of this parameter. Thus, we reveal that, regardless of how large the dielectric strength of the material is, there is an upper bound on the amount of harvested energy that depends only on the ultimate stretch ratio. We conclude the work with detailed calculations of the optimal cycles for two commercially available elastic dielectrics.

R. Springhetti; E. Bortot; G. deBotton; M. Gei

2014-03-13T23:59:59.000Z

138

Evaluating and developing parameter optimization and uncertainty analysis methods for a computationally intensive distributed hydrological model  

E-Print Network [OSTI]

This study focuses on developing and evaluating efficient and effective parameter calibration and uncertainty methods for hydrologic modeling. Five single objective optimization algorithms and six multi-objective optimization algorithms were tested...

Zhang, Xuesong

2009-05-15T23:59:59.000Z

139

A new approach based on ant colony optimization for daily Volt/Var control in distribution networks considering distributed generators  

Science Journals Connector (OSTI)

This paper presents a new approach to daily Volt/Var control in distribution systems with regard to distributed generators (DGs). Due to the small X/R ratio and radial configuration of distribution systems, \\{DGs\\} have much impact on this problem. A cost-based compensation methodology is proposed as a proper signal to encourage owners of \\{DGs\\} in active and reactive power generation. An evolutionary method based on ant colony optimization (ACO) is used to determine the active and reactive power values of DGs, reactive power values of capacitors and tap positions of transformers for the next day. The results indicate that the proposed encouraging factor has improved the performance of distribution networks on a large scale.

Taher Niknam

2008-01-01T23:59:59.000Z

140

Method and apparatus for automated, modular, biomass power generation  

DOE Patents [OSTI]

Method and apparatus for generating a low tar, renewable fuel gas from biomass and using it in other energy conversion devices, many of which were designed for use with gaseous and liquid fossil fuels. An automated, downdraft gasifier incorporates extensive air injection into the char bed to maintain the conditions that promote the destruction of residual tars. The resulting fuel gas and entrained char and ash are cooled in a special heat exchanger, and then continuously cleaned in a filter prior to usage in standalone as well as networked power systems.

Diebold, James P. (Lakewood, CO); Lilley, Arthur (Finleyville, PA); Browne, Kingsbury III (Golden, CO); Walt, Robb Ray (Aurora, CO); Duncan, Dustin (Littleton, CO); Walker, Michael (Longmont, CO); Steele, John (Aurora, CO); Fields, Michael (Arvada, CO); Smith, Trevor (Lakewood, CO)

2011-03-22T23:59:59.000Z

Note: This page contains sample records for the topic "generation optimization methods" 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

Method and apparatus for automated, modular, biomass power generation  

DOE Patents [OSTI]

Method and apparatus for generating a low tar, renewable fuel gas from biomass and using it in other energy conversion devices, many of which were designed for use with gaseous and liquid fossil fuels. An automated, downdraft gasifier incorporates extensive air injection into the char bed to maintain the conditions that promote the destruction of residual tars. The resulting fuel gas and entrained char and ash are cooled in a special heat exchanger, and then continuously cleaned in a filter prior to usage in standalone as well as networked power systems.

Diebold, James P; Lilley, Arthur; Browne, III, Kingsbury; Walt, Robb Ray; Duncan, Dustin; Walker, Michael; Steele, John; Fields, Michael; Smith, Trevor

2013-11-05T23:59:59.000Z

142

Derivative-free Methods for Mixed-Integer Constrained Optimization ...  

E-Print Network [OSTI]

and composition of heat intercepts in a thermal insulation system. Optimization and. Engineering 2(1) ... constant-power region operation. IEEE Transaction on ...

2014-03-04T23:59:59.000Z

143

An integrated optimal design method for utility power distribution systems.  

E-Print Network [OSTI]

??This dissertation presents a comprehensive and integrated design methodology to optimize both the electrical and the economic performance of a utility power distribution system. The… (more)

Fehr, Ralph E

2005-01-01T23:59:59.000Z

144

Optimization Online - A Proximal Multiplier Method for Convex ...  

E-Print Network [OSTI]

Sep 29, 2014 ... Abstract: This work is devoted to the study of a proximal decomposition algorithm for solving convex symmetric cone optimization with ...

Julio López

2014-09-29T23:59:59.000Z

145

Parallel Coordinate Descent Methods for Big Data Optimization ?  

E-Print Network [OSTI]

Dec 4, 2012 ... Abstract. In this work we show that randomized (block) coordinate ... and this work is aimed at developing optimization algorithms suitable for.

2012-12-04T23:59:59.000Z

146

Fuel processor and method for generating hydrogen for fuel cells  

DOE Patents [OSTI]

A method of producing a H.sub.2 rich gas stream includes supplying an O.sub.2 rich gas, steam, and fuel to an inner reforming zone of a fuel processor that includes a partial oxidation catalyst and a steam reforming catalyst or a combined partial oxidation and stream reforming catalyst. The method also includes contacting the O.sub.2 rich gas, steam, and fuel with the partial oxidation catalyst and the steam reforming catalyst or the combined partial oxidation and stream reforming catalyst in the inner reforming zone to generate a hot reformate stream. The method still further includes cooling the hot reformate stream in a cooling zone to produce a cooled reformate stream. Additionally, the method includes removing sulfur-containing compounds from the cooled reformate stream by contacting the cooled reformate stream with a sulfur removal agent. The method still further includes contacting the cooled reformate stream with a catalyst that converts water and carbon monoxide to carbon dioxide and H.sub.2 in a water-gas-shift zone to produce a final reformate stream in the fuel processor.

Ahmed, Shabbir (Naperville, IL); Lee, Sheldon H. D. (Willowbrook, IL); Carter, John David (Bolingbrook, IL); Krumpelt, Michael (Naperville, IL); Myers, Deborah J. (Lisle, IL)

2009-07-21T23:59:59.000Z

147

Oxygen-16 by the Method of Generator Coordinates  

Science Journals Connector (OSTI)

Dilatational and collective quadrupole excitations of the nucleus O16 are treated by the method of generator coordinates described in the preceding paper. In this method, one starts from assumed two-body forces and calculates the stiffness, inertia, and frequency of the collective motion. Numerical results are presented for these quantities.Experimental data relative to collective 0+ and 2+ states in O16 are summarized, and other theoretical treatments of this problem are discussed. It is noted that collective models all imply too large a matrix element for the decay of the 6.06-Mev (0+) state. One concludes that this state is not primarily a dilatational excitation. Similar considerations apply to the 6.91-Mev (2+) state.

James J. Griffin

1957-10-15T23:59:59.000Z

148

Abstract--A bi-objective optimization model of power and power changes generated by a wind turbine is discussed in this  

E-Print Network [OSTI]

for optimizing the power of the DFIG (Doubly Fed Induction Generator). Abdelli et al. [5] applied a multi

Kusiak, Andrew

149

Collocation Methods for Optimization in a Modelica Environment Fredrik Magnussona Johan kessona,b  

E-Print Network [OSTI]

Collocation Methods for Optimization in a Modelica Environment Fredrik Magnussona Johan Ã?kessona The solution of generic dynamic optimization prob- lems described by Modelica, and its extension Opti- mica dynamics are de- scribed using Modelica, and the optimization formu- lation is done with the use

150

A global optimization method for the design of space trajectories  

Science Journals Connector (OSTI)

The problem of optimally designing a trajectory for a space mission is considered in this paper. Actual mission design is a complex, multi-disciplinary and multi-objective activity with relevant economic implications. In this paper we will consider some ... Keywords: Basin hopping, Black-box, Global optimization, Implicit filter, Space trajectories

Bernardetta Addis; Andrea Cassioli; Marco Locatelli; Fabio Schoen

2011-04-01T23:59:59.000Z

151

Optimal Controller Design of a Wind Turbine with Doubly Fed Induction Generator for Small Signal Stability Enhancement  

Science Journals Connector (OSTI)

Multi-objective optimal controller design of a doubly fed induction generator (DFIG) wind turbine system using Differential Evolution ( ... this chapter. A detailed mathematical model of DFIG wind turbine with a ...

Lihui Yang; Guang Ya Yang; Zhao Xu; Zhao Yang Dong; Yusheng Xue

2010-01-01T23:59:59.000Z

152

A stochastic programming approach for optimal microgrid economic operation under uncertainty using 2m?+?1 point estimate method  

Science Journals Connector (OSTI)

By increasing concern over climate change and the security of energy supplies wind power and photovoltaic are emerging as important sources of electrical energy throughout the world. The wind speed at a given location is continuously varying. There are changes in the annual mean wind speed from year to year (annual) changes with season (seasonal) with passing weather systems (synoptic) on a daily basis (diurnal) and from second to second (turbulence). Common sense tells us that irradiation varies regionally with the changing seasons and hourly with the daily variation of the sun's evaluation. This paper proposes a new method for optimal management of MicroGrids under uncertain environments. In this study the 2m?+?1 point estimate method is used to model the uncertainty in the load demands the market prices and the electric power generation of the wind farms and the photovoltaic systems. The Weibull Beta and normal distributions are used to handle the uncertain input variables in this study. Moreover a Self-Adaptive Bee Swarm Optimization algorithm is presented to achieve an optimal-operational planning with regard to the cost minimization. In the proposed framework four different moving patterns are suggested in order to make an adaptive and robust optimization algorithm for different problems with different fitness landscape. In the devised method each bee self-adaptively chooses one of the proposed moving patterns according to a probability model to update its position. The proposed probability model is based on the ability of each strategy to generate more optimal solutions in the past generations. The efficiency of the method is validated on a typical microgrid.

2013-01-01T23:59:59.000Z

153

Hydrodynamic Optimization Method and Design Code for Stall-Regulated Hydrokinetic Turbine Rotors  

SciTech Connect (OSTI)

This report describes the adaptation of a wind turbine performance code for use in the development of a general use design code and optimization method for stall-regulated horizontal-axis hydrokinetic turbine rotors. This rotor optimization code couples a modern genetic algorithm and blade-element momentum performance code in a user-friendly graphical user interface (GUI) that allows for rapid and intuitive design of optimal stall-regulated rotors. This optimization method calculates the optimal chord, twist, and hydrofoil distributions which maximize the hydrodynamic efficiency and ensure that the rotor produces an ideal power curve and avoids cavitation. Optimizing a rotor for maximum efficiency does not necessarily create a turbine with the lowest cost of energy, but maximizing the efficiency is an excellent criterion to use as a first pass in the design process. To test the capabilities of this optimization method, two conceptual rotors were designed which successfully met the design objectives.

Sale, D.; Jonkman, J.; Musial, W.

2009-08-01T23:59:59.000Z

154

Optimizing Photovoltaic Charge Generation of Nanowire Arrays: A Simple Semi-Analytic Approach  

E-Print Network [OSTI]

Nanowire arrays exhibit efficient light coupling and strong light trapping, making them well suited to solar cell applications. The processes that contribute to their absorption are interrelated and highly dispersive, so the only current method of optimizing the absorption is by intensive numerical calculations. We present an efficient alternative which depends solely on the wavelength-dependent refractive indices of the constituent materials. We choose each array parameter such that the number of modes propagating away from the absorber is minimized while the number of resonant modes within the absorber is maximized. From this we develop a semi-analytic method that quantitatively identifies the small range of parameters where arrays achieve maximum short circuit currents. This provides a fast route to optimizing NW array cell efficiencies by greatly reducing the geometries to study with full device models. Our approach is general and applies to a variety of materials and to a large range of array thicknesses...

Sturmberg, Björn C P; Botten, Lindsay C; Asatryan, Ara A; Poulton, Christopher G; McPhedran, Ross C; de Sterke, C Martijn

2014-01-01T23:59:59.000Z

155

Inexact Restoration method for Derivative-Free Optimization with ...  

E-Print Network [OSTI]

Nov 21, 2011 ... Although this paper deals with optimization problems in which con- ... and others are not, it is sensible to include the expensive constraints in the objective ...... last 7 columns have analogous meanings as the first ones. 6 Final ...

2011-11-21T23:59:59.000Z

156

Optimal sizing method for stand-alone hybrid solar–wind system with LPSP technology by using genetic algorithm  

Science Journals Connector (OSTI)

System power reliability under varying weather conditions and the corresponding system cost are the two main concerns for designing hybrid solar–wind power generation systems. This paper recommends an optimal sizing method to optimize the configurations of a hybrid solar–wind system employing battery banks. Based on a genetic algorithm (GA), which has the ability to attain the global optimum with relative computational simplicity, one optimal sizing method was developed to calculate the optimum system configuration that can achieve the customers required loss of power supply probability (LPSP) with a minimum annualized cost of system (ACS). The decision variables included in the optimization process are the PV module number, wind turbine number, battery number, PV module slope angle and wind turbine installation height. The proposed method has been applied to the analysis of a hybrid system which supplies power for a telecommunication relay station, and good optimization performance has been found. Furthermore, the relationships between system power reliability and system configurations were also given.

Hongxing Yang; Wei Zhou; Lin Lu; Zhaohong Fang

2008-01-01T23:59:59.000Z

157

Optimized Free Surface Fluids on Adaptive Grids with the Lattice Boltzmann Method  

E-Print Network [OSTI]

Optimized Free Surface Fluids on Adaptive Grids with the Lattice Boltzmann Method Nils Thürey Free Surface Fluids with the Lattice Boltzmann Method (LBM): Optimizations with Adaptive Grids t + 4 Step G3 Step G2 G2 > G3 Step G1 .... Lattice Boltzmann: - Similar to Cellular Automata - Regular

158

ANALYSIS AND OPTIMIZATION USING NUMERICAL AND EXPERIMENTAL EVALUATION METHODS FOR MULTIDISCIPLINARY DESIGN PROBLEMS  

E-Print Network [OSTI]

, vibration/noise control, and fluid mechanics, simultaneously. Higher product quality, less developing time and lower manufacturing cost will be achieved through a balanced and organic MDO method. In this paper, numerical stress analysis, optimization method...

Oh, Bong T.

2010-01-16T23:59:59.000Z

159

Acceptance-rejection methods for generating random variates from matrix exponential distributions and rational  

E-Print Network [OSTI]

Acceptance-rejection methods for generating random variates from matrix exponential distributions generation, Simulation, Matrix Exponential Distributions, Rational Arrival Processes. 1. INTRODUCTION Despite on the efficient generation of random variates of matrix exponential (ME) distributions [10] and rational arrival

Telek, Miklós

160

Optimal Tariff Period Determination Cost of electricity generation is closely related to system demand. In general, the  

E-Print Network [OSTI]

Optimal Tariff Period Determination Cost of electricity generation is closely related to system setting is giving signal to customers the time variant cost of supplying electricity. Since the costs demand. In general, the generation cost is higher during system peak period, and vice versa. In Hong Kong

Note: This page contains sample records for the topic "generation optimization methods" 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

Methods and apparatus for cooling wind turbine generators  

DOE Patents [OSTI]

A wind turbine generator includes a stator having a core and a plurality of stator windings circumferentially spaced about a generator longitudinal axis. A rotor is rotatable about the generator longitudinal axis, and the rotor includes a plurality of magnetic elements coupled to the rotor and cooperating with the stator windings. The magnetic elements are configured to generate a magnetic field and the stator windings are configured to interact with the magnetic field to generate a voltage in the stator windings. A heat pipe assembly thermally engaging one of the stator and the rotor to dissipate heat generated in the stator or rotor.

Salamah, Samir A. (Niskayuna, NY); Gadre, Aniruddha Dattatraya (Rexford, NY); Garg, Jivtesh (Schenectady, NY); Bagepalli, Bharat Sampathkumaran (Niskayuna, NY); Jansen, Patrick Lee (Alplaus, NY); Carl, Jr., Ralph James (Clifton Park, NY)

2008-10-28T23:59:59.000Z

162

Eco-operation of co-generation systems optimized by environmental load value  

SciTech Connect (OSTI)

In this paper the authors introduce a life cycle assessment scheme with the aid of the environmental load value (ELV) as a numerical measure to estimate the quantitative load of any industrial activity on the environment. The value is calculated from the total summation of the respective environmental load indexes through the life cycle activity from cradle to grave. An algorithm and a software using a combined simplex and branch-bound technique are accomplished to give the numerical ELV and its optimization. This ELV scheme is applied to co-generation energy systems consisting of gas turbines, waste-heat boilers, auxiliary boilers, steam turbines, electricity operated turbo refrigerators, steam absorption refrigerators and heat exchangers, which can be easily set up on the computer display in an ICON and Q and A style, including various kinds of parameters. The two kinds of environmental loads respecting the fossil fuel depletion and the CO{sub 2} global warming due to electricity generation from power stations in Japan are chosen as the ELV criterion. The ELV optimization is calculated corresponding to the hourly energy demands for electricity, air cooling, air heating, and hot water from a district consisting eight office buildings and four hotels. As a result, the ELV scheme constructed here is found to be an attractive and powerful tool to quantitatively estimate the LCA environmental loads of any industrial activity like co-generation energy systems and to propose the eco-operation of the industrial activity of interest. The cost estimation can be made as well.

Kato, Seizo; Nomura, Nobukazu; Maruyama, Naoki

1998-07-01T23:59:59.000Z

163

Generating set search methods for piecewise smooth problems ?  

E-Print Network [OSTI]

Nov 13, 2007 ... a set of generators for Tj(x), then x is a stationary point. Proof. By (3) .... then ?k = B; otherwise ?k contains a set of generators Gk j (x) for Tj(x),.

2007-11-13T23:59:59.000Z

164

On Using a Gradient-based Method for Heliostat Field Layout Optimization  

Science Journals Connector (OSTI)

Abstract The most widely used methods for heliostat field optimization assume a particular pattern and then optimize the parameters that define the pattern to obtain a specified objective such as optimum optical efficiency or maximum power output. It has been demonstrated that these optimized patterns are not necessarily optimal; improvements are possible. Allowing heliostat field placement independent of an a priori pattern may therefore result in improved performance. While initial placement of heliostats in a fixed pattern may reduce computational burden, this paper demonstrates that an optimal field can be designed using a gradient-based optimization method starting from a random initial field and resulting in a field performing better than optimized patterns. The greatest challenge is computational expense. However, a simplified field analysis tool used as an objective function in a suitable optimization procedure sufficiently reduces the computational expense. An algorithm for very large scale optimal design, denoted SAOi, is applied. The algorithm is based on sequential approximate optimization and exploits some of the advantages of quadratic approximations while minimizing storage requirements. This algorithm proves attractive for the present problem where the design variables are large and the constraints outnumber the design variables. The procedure is applied to redesign the PS10 field with an improvement of 1.2% in annual intercepted energy. The research presented herein shows how heliostat placement can be done with each heliostat location as a separate design variable resulting in wholly optimal field placements.

S.L. Lutchman; A.A. Groenwold; P. Gauché; S. Bode

2014-01-01T23:59:59.000Z

165

Load Distributed Whole-body Motion Generation Method for Humanoids by  

E-Print Network [OSTI]

1 Load Distributed Whole-body Motion Generation Method for Humanoids by Minimizing Average Joint. Keywords. Humanoid robot, Load distribution, Whole-body motion generation method, Joint Torque, Environment generation method under whole-body coor- dination, it is very important to consider a load distribution

Yamamoto, Hirosuke

166

Global Optimization Methods for the Aerodynamic Shape Design of Transonic Cascades  

E-Print Network [OSTI]

Global Optimization Methods for the Aerodynamic Shape Design of Transonic Cascades T. Mengistu algorithms, namely Genetic Algorithm (GA) and Simulated Annealing (SA), have been applied to the aerodynamic reduction in total pressure loss by eliminating the passage shock. 1. INTRODUCTION Aerodynamic optimization

Neumaier, Arnold

167

A Global Optimization Method, ffBB, for General TwiceDifferentiable Constrained  

E-Print Network [OSTI]

A Global Optimization Method, ffBB, for General Twice­Differentiable Constrained NLPs: II et al., 1997) described the theoretical foundations of a global optimization algorithm, the ff problems, of small and medium size chemical engineering problems in the areas of reactor network design

Neumaier, Arnold

168

Apparatus and method for generating partially coherent illumination for photolithography  

DOE Patents [OSTI]

The present invention relates an apparatus and method for creating a bright, uniform source of partially coherent radiation for illuminating a pattern, in order to replicate an image of said pattern with a high degree of acuity. The present invention introduces a novel scatter plate into the optical path of source light used for illuminating a replicated object. The scatter plate has been designed to interrupt a focused, incoming light beam by introducing between about 8 to 24 diffraction zones blazed onto the surface of the scatter plate which intercept the light and redirect it to a like number of different positions in the condenser entrance pupil each of which is determined by the relative orientation and the spatial frequency of the diffraction grating in each of the several zones. Light falling onto the scatter plate, therefore, generates a plurality of unphased sources of illumination as seen by the back half of the optical system. The system includes a high brightness source, such as a laser, creating light which is taken up by a beam forming optic which focuses the incoming light into a condenser which in turn, focuses light into a field lens creating Kohler illumination image of the source in a camera entrance pupil. The light passing through the field lens illuminates a mask which interrupts the source light as either a positive or negative image of the object to be replicated. Light passing by the mask is focused into the entrance pupil of the lithographic camera creating an image of the mask onto a receptive media. 7 figs.

Sweatt, W.C.

1999-07-06T23:59:59.000Z

169

Apparatus and method for generating partially coherent illumination for photolithography  

DOE Patents [OSTI]

The present invention relates an apparatus and method for creating a bright, uniform source of partially coherent radiation for illuminating a pattern, in order to replicate an image of said pattern with a high degree of acuity. The present invention introduces a novel scatter plate into the optical path of source light used for illuminating a replicated object. The scatter plate has been designed to interrupt a focused, incoming light beam by introducing between about 8 to 24 diffraction zones blazed onto the surface of the scatter plate which intercept the light and redirect it to a like number of different positions in the condenser entrance pupil each of which is determined by the relative orientation and the spatial frequency of the diffraction grating in each of the several zones. Light falling onto the scatter plate, therefore, generates a plurality of unphased sources of illumination as seen by the back half of the optical system. The system includes a high brightness source, such as a laser, creating light which is taken up by a beam forming optic which focuses the incoming light into a condenser which in turn, focuses light into a field lens creating Kohler illumination image of the source in a camera entrance pupil. The light passing through the field lens illuminates a mask which interrupts the source light as either a positive or negative image of the object to be replicated. Light passing by the mask is focused into the entrance pupil of the lithographic camera creating an image of the mask onto a receptive media.

Sweatt, William C. (Albuquerque, NM)

1999-01-01T23:59:59.000Z

170

Optimal crystal surface for efficient channeling in the new generation of hadron machines  

SciTech Connect (OSTI)

The new generation of hadron machines may profitably take advantage of channeling for steering and collimation of high-energy particle beams. In that case, the requirements on the quality of the crystal surface are rather stringent in terms of both lattice perfection and roughness. Here, the authors show the structural and morphological characterizations of crystals fabricated through a method to achieve a surface that fulfills all needed specifications for application in hadron machines.

Baricordi, S.; Guidi, V.; Mazzolari, A.; Martinelli, G.; Carnera, A.; De Salvador, D.; Sambo, A.; Della Mea, G.; Milan, R.; Vomiero, A.; Scandale, W. [Dipartimento di Fisica, Universita di Ferrara and INFN sezione di Ferrara, Via Saragat 1, Ferrara 44100 (Italy); Dipartimento di Fisica, Universita di Padova and INFN-Laboratori Nazionali di Legnaro, Viale dell' Universita 2, Legnaro, 35020 Padova (Italy); Dipartimento dei Materiali e Tecnologie Industriali, Universita di Trento, Via Mesiano 77, Trento 1-38100, Italy and INFN-Laboratori Nazionali di Legnaro, Viale dell' Universita 2, Legnaro, 35020 Padova (Italy); INFN-Laboratori Nazionali di Legnaro, Viale dell' Universita 2, Legnaro, 35020 Padova (Italy); INFM-CNR Sensor Laboratory, Brescia University, Via Valotti 9, Brescia 25133, Italy and INFN-Laboratori Nazionali di Legnaro, Viale dell' Universita 2, Legnaro, 35020 Padova (Italy); European Organization for Nuclear Research (CERN), CH-1211 Geneva (Switzerland)

2007-08-06T23:59:59.000Z

171

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

172

Global Optimization: Examples, Methods and July 5, 2011 1 --5  

E-Print Network [OSTI]

energy E0 n(r) Matrices generation Ak = Bk = 40% time usage Generalized, next to Aachen University main building. More information can be found here: http://www.aices.rwth-aachen.de/find-us Initialization: non-interacting spherical V0(r) Calculation of full-potential V (r)[n] usage Charge

173

Method and apparatus for generating low energy nuclear particles  

DOE Patents [OSTI]

A particle accelerator (12) generates an input particle beam having an initial energy level above a threshold for generating secondary nuclear particles. A thin target (14) is rotated in the path of the input beam for undergoing nuclear reactions to generate the secondary particles and correspondingly decrease energy of the input beam to about the threshold. The target (14) produces low energy secondary particles and is effectively cooled by radiation and conduction. A neutron scatterer (44) and a neutron filter (42) are also used for preferentially degrading the secondary particles into a lower energy range if desired.

Powell, James R. (Shoreham, NY); Reich, Morris (Flushing, NY); Ludewig, Hans (Brookhaven, NY); Todosow, Michael (Miller Place, NY)

1999-02-09T23:59:59.000Z

174

Method and apparatus for generating low energy nuclear particles  

DOE Patents [OSTI]

A particle accelerator generates an input particle beam having an initial energy level above a threshold for generating secondary nuclear particles. A thin target is rotated in the path of the input beam for undergoing nuclear reactions to generate the secondary particles and correspondingly decrease energy of the input beam to about the threshold. The target produces low energy secondary particles and is effectively cooled by radiation and conduction. A neutron scatterer and a neutron filter are also used for preferentially degrading the secondary particles into a lower energy range if desired. 18 figs.

Powell, J.R.; Reich, M.; Ludewig, H.; Todosow, M.

1999-02-09T23:59:59.000Z

175

Applying methods of numerical modeling to optimize a plasma burner of atmospheric pressure  

Science Journals Connector (OSTI)

The shape of a plasma burner is optimized by the methods of numerical modeling. Vortex-free flow is created in the burner merely at the expense of selecting the external tube profile rather than by introductio...

S. M. Perminov; V. N. Perminova…

1993-09-01T23:59:59.000Z

176

Optimization method for obtaining nearest-neighbour DNA entropies and enthalpies directly from melting temperatures  

Science Journals Connector (OSTI)

......require the knowledge of total sequence entropies and enthalpies which are not always available. Results: Here we implement and test a new melting temperature optimization method (MTO) where we obtain the NN parameters directly from the temperatures. In this......

Gerald Weber

2014-11-01T23:59:59.000Z

177

A novel optimization-based pole-figure inversion method: comparison with WIMV and maximum entropy methods  

Science Journals Connector (OSTI)

An optimization-based pole-figure inversion method is presented that utilizes the orientation distribution function gradient for conditional control of the solution. The novel pole-figure inversion method, coined the hybrid -seminorm minimization, is empirically shown to be versatile, general and robust in the presence of simulated experimental errors.

Bernier, J.V.

2006-09-12T23:59:59.000Z

178

Comparison of heuristic methods for reliability optimization of series-parallel systems  

E-Print Network [OSTI]

COMPARISON OF HEURISTIC METHODS FOR RELIABILITY OPTIMIZATION OF SERIE&PARALLEL SYSTEMS A Thesis by HSIANG LEE Submitted to the Office of Graduate Studies of Texas ARM University in partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE May 2003 Major Subject: Industrial Engineering COMPARISON OF HEURISTIC METHODS FOR RELIABILITY OPTIMIZATION OF SERIES-PARALLEL SYSTEMS A. Thesis by HSIANG LEE Submitted to Texas ASSAM University in partial fulfillment...

Lee, Hsiang

2012-06-07T23:59:59.000Z

179

Thermoelectric generator and method for the fabrication thereof  

DOE Patents [OSTI]

A thermoelectric generator using semiconductor elements for responding to a temperature gradient to produce electrical energy with all of the semiconductor elements being of the same type is disclosed. A continuous process for forming substrates on which the semiconductor elements and superstrates are deposited and a process for forming the semiconductor elements on the substrates are also disclosed. The substrates with the semiconductor elements thereon are combined with superstrates to form modules for use thermoelectric generators.

Benson, David K. (Golden, CO); Tracy, C. Edwin (Golden, CO)

1987-01-01T23:59:59.000Z

180

Thermoelectric generator and method for the fabrication thereof  

DOE Patents [OSTI]

A thermoelectric generator using semiconductor elements for responding to a temperature gradient to produce electrical energy with all of the semiconductor elements being of the same type is disclosed. A continuous process for forming substrates on which the semiconductor elements and superstrates are deposited and a process for forming the semiconductor elements on the substrates are also disclosed. The substrates with the semiconductor elements thereon are combined with superstrates to form modules for use as thermoelectric generators.

Benson, D.K.; Tracy, C.E.

1984-08-01T23:59:59.000Z

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


181

A 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.

182

Optimization Online - The Inexact Spectral Bundle Method for ...  

E-Print Network [OSTI]

Nov 2, 2010 ... e.ntu.edu.sg) ... with matrices of order up to 3000 are performed and the computational results establish the effectiveness of this method.

Lin Huiling

2010-11-02T23:59:59.000Z

183

Optimization Online - A Power Penalty Method for Second-order ...  

E-Print Network [OSTI]

Apr 26, 2014 ... A Power Penalty Method for Second-order Cone Nonlinear Complementarity Problems. Zijun Hao(haozijun ***at*** whu.edu.cn) Zhongping ...

Zijun Hao

2014-04-26T23:59:59.000Z

184

An acceleration procedure for optimal first-order methods  

E-Print Network [OSTI]

Jul 16, 2012 ... In Section 3, we apply these methods to the eigenvalue ...... results that we present in this section are averaged over ten runs and obtained.

2012-07-16T23:59:59.000Z

185

Optimization Online - A regularized limited-memory BFGS method ...  

E-Print Network [OSTI]

Aug 4, 2014 ... Abstract: The limited-memory BFGS (L-BFGS) algorithm is a popular method of solving large-scale unconstrained minimization problems.

Shinji Sugimoto

2014-08-04T23:59:59.000Z

186

Hybrid methods for interplanetary low-thrust trajectory optimization  

E-Print Network [OSTI]

propulsion produces thrust by burning a mixture of fuel and oxidizer. Unlike chemical propulsion, solar/nuclear electric propulsion based ion or plasma engines generate thmst by taking advantages of magnetism and electricity. An inert gas like Xenon... in Figure 2-11. Energy and eccentricity are shown in Figures 2-12 and 2-13. The energy increases gradually without oscillation. Unlike the energy behavior, there is oscillation occurring at the beginning of 25 the eccentricity plot. The number of lhe...

Aroonwilairut, Krisada

2012-06-07T23:59:59.000Z

187

Optimal design and techno-economic analysis of a hybrid solar–wind power generation system  

Science Journals Connector (OSTI)

Solar energy and wind energy are the two most viable renewable energy resources in the world. Good compensation characters are usually found between solar energy and wind energy. This paper recommend an optimal design model for designing hybrid solar–wind systems employing battery banks for calculating the system optimum configurations and ensuring that the annualized cost of the systems is minimized while satisfying the custom required loss of power supply probability (LPSP). The five decision variables included in the optimization process are the PV module number, PV module slope angle, wind turbine number, wind turbine installation height and battery capacity. The proposed method has been applied to design a hybrid system to supply power for a telecommunication relay station along south-east coast of China. The research and project monitoring results of the hybrid project were reported, good complementary characteristics between the solar and wind energy were found, and the hybrid system turned out to be able to perform very well as expected throughout the year with the battery over-discharge situations seldom occurred.

Hongxing Yang; Zhou Wei; Lou Chengzhi

2009-01-01T23:59:59.000Z

188

Free Flow Energy (TRL 1 2 3 Component)- Design and Development of a Cross-Platform Submersible Generator Optimized for the Conditions of Current Energy Conversion  

Broader source: Energy.gov [DOE]

Free Flow Energy (TRL 1 2 3 Component) - Design and Development of a Cross-Platform Submersible Generator Optimized for the Conditions of Current Energy Conversion

189

Quadrupole correlation energy by the generator coordinate method  

Science Journals Connector (OSTI)

We investigate the accuracy of several schemes to calculate ground-state correlation energies using the generator coordinate technique. Our test bed for the study is the sd-interacting boson model, equivalent to a six-level Lipkin-type model. We find that the simplified projection of a triaxial generator coordinate state using the S3 subgroup of the rotation group is not very accurate in the parameter space of the Hamiltonian of interest. On the other hand, a full rotational projection of an axial generator coordinate state gives remarkable accuracy. We also discuss the validity of the simplified treatment using the extended Gaussian overlap approximation, and show that it works reasonably well when the number of boson is 4 or larger.

K. Hagino; G. F. Bertsch; P.-G. Reinhard

2003-08-14T23:59:59.000Z

190

Randomized coordinate descent methods for big data optimization   

E-Print Network [OSTI]

This thesis consists of 5 chapters. We develop new serial (Chapter 2), parallel (Chapter 3), distributed (Chapter 4) and primal-dual (Chapter 5) stochastic (randomized) coordinate descent methods, analyze their complexity ...

Takac, Martin

2014-07-01T23:59:59.000Z

191

Optimal Statistical Methods for Analysis of Single-Molecule Data  

E-Print Network [OSTI]

5 Application to Single Molecule Trajectories 5.1 Maximum13 Methods and Materials 13.1 A server-based single-moleculeto-End Distance on Single-Molecule Experi- ment Time Scales

Watkins, Lucas

2009-01-01T23:59:59.000Z

192

Compensating Customer-Generators: A taxonomy describing methods of compensating  

E-Print Network [OSTI]

their electricity demands (loads) (IEA, 2003; Lovins, 2003). This trend can be attributed to factors, investment in grid-connected generation capacity is growing at a faster rate than off-grid applications (IEA of Canadian utilities, utility review boards, and provincial governments showed that there is no consensus

Hughes, Larry

193

Iterative method for evaluating the matrix representation of the generators in the unitary-group approach  

Science Journals Connector (OSTI)

An iterative method is presented for the evaluation of the matrix representation of the group generators in the unitary-group approach to many-electron systems. The method yields, in addition, closed-form expressions and selection rules for nonvanishing matrix elements. Generator products (two-body operators) are treated by a scalar-product method.

A. Lev; M. Schlesinger; R. D. Kent

1984-12-01T23:59:59.000Z

194

Variational and Optimization Methods in Meteorology: A Review  

E-Print Network [OSTI]

- tinuous in time, but localized in space (satellite data for instance)? (Data assimilation problem) iii processes and parametrization of subgrid phenomena. b) Data: New sources of data such as satellite data a view of the state of art in the field. Variational methods attempt to achieve a best fit between data

Navon, Michael

195

New Methods in Motion Tracking to Generate Motion-Corrected Tomographi...  

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

Analysis Energy Analysis Find More Like This Return to Search New Methods in Motion Tracking to Generate Motion-Corrected Tomographic Images Oak Ridge National Laboratory...

196

Optimal design of switched reluctance motor using two-dimensional finite element method  

Science Journals Connector (OSTI)

Switched reluctance motor (SRM) has some advantages such as low cost high torque density etc. but SRM has essentially high torque ripple due to its salient structure. To apply SRM to the industrial field we have to minimize torque ripple which is the weak point of SRM. This article introduces optimal design process of SRM using a numerical method such as two-dimensional (2D) finite element method. The electrical and geometrical design parameters have been adopted as 2D design variables. From this work we can obtain the optimal design which minimizes the torque ripple. We also can obtain the optimal design which maximizes the average torque. Finally this article presents performance comparison of two optimal designs the minimized torque ripple and the maximized average torque.

Youn-Hyun Kim; Jae-Hak Choi; Sung-In Jung; Sol Kim; Ju Lee; Min-Sik Chu; Kyung-Jin Hong; Dong-Hoon Choi

2002-01-01T23:59:59.000Z

197

Methods, systems, and computer program products for network firewall policy optimization  

DOE Patents [OSTI]

Methods, systems, and computer program products for firewall policy optimization are disclosed. According to one method, a firewall policy including an ordered list of firewall rules is defined. For each rule, a probability indicating a likelihood of receiving a packet matching the rule is determined. The rules are sorted in order of non-increasing probability in a manner that preserves the firewall policy.

Fulp, Errin W. (Winston-Salem, NC); Tarsa, Stephen J. (Duxbury, MA)

2011-10-18T23:59:59.000Z

198

Generating Scenarios of Local Surface Temperature Using Time Series Methods  

Science Journals Connector (OSTI)

A method for creating scenarios of time series of monthly mean surface temperature at a specific site is developed. It is postulated that surface temperature can be specified as a linear combination of regional and local temperature components, ...

Robert S. Chen; Peter J. Robinson

1991-07-01T23:59:59.000Z

199

Generation IV PR and PP Methods and Applications  

SciTech Connect (OSTI)

This paper presents an evaluation methodology for proliferation resistance and physical protection (PR&PP) of Generation IV nuclear energy systems (NESs). For a proposed NES design, the methodology defines a set of challenges, analyzes system response to these challenges, and assesses outcomes. The challenges to the NES are the threats posed by potential actors (proliferant States or sub-national adversaries). The characteristics of Generation IV systems, both technical and institutional, are used to evaluate the response of the system and determine its resistance against proliferation threats and robustness against sabotage and terrorism threats. The outcomes of the system response are expressed in terms of six measures for PR and three measures for PP, which are the high-level PR&PP characteristics of the NES. The methodology is organized to allow evaluations to be performed at the earliest stages of system design and to become more detailed and more representative as design progresses. Uncertainty of results are recognized and incorporated into the evaluation at all stages. The results are intended for three types of users: system designers, program policy makers, and external stakeholders. Particular current relevant activities will be discussed in this regard. The methodology has been illustrated in a series of demonstration and case studies and these will be summarized in the paper.

Bari,R.A.

2008-10-13T23:59:59.000Z

200

Method of generating hydrogen gas from sodium borohydride  

DOE Patents [OSTI]

A compact solid source of hydrogen gas, where the gas is generated by contacting water with micro-disperse particles of sodium borohydride in the presence of a catalyst, such as cobalt or ruthenium. The micro-disperse particles can have a substantially uniform diameter of 1-10 microns, and preferably about 3-5 microns. Ruthenium or cobalt catalytic nanoparticles can be incorporated in the micro-disperse particles of sodium borohydride, which allows a rapid and complete reaction to occur without the problems associated with caking and scaling of the surface by the reactant product sodium metaborate. A closed loop water management system can be used to recycle wastewater from a PEM fuel cell to supply water for reacting with the micro-disperse particles of sodium borohydride in a compact hydrogen gas generator. Capillary forces can wick water from a water reservoir into a packed bed of micro-disperse fuel particles, eliminating the need for using an active pump.

Kravitz, Stanley H. (Placitas, NM); Hecht, Andrew M. (Sandia Park, NM); Sylwester, Alan P. (Albuquerque, NM); Bell, Nelson S. (Albuquerque, NM)

2007-12-11T23:59:59.000Z

Note: This page contains sample records for the topic "generation optimization methods" 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

System and method for generating current by selective electron heating  

DOE Patents [OSTI]

A system for the generation of toroidal current in a plasma which is prepared in a toroidal magnetic field. The system utilizes the injection of high-frequency waves into the plasma by means of waveguides. The wave frequency and polarization are chosen such that when the waveguides are tilted in a predetermined fashion, the wave energy is absorbed preferentially by electrons traveling in one toroidal direction. The absorption of energy in this manner produces a toroidal electric current even when the injected waves themselves do not have substantial toroidal momentum. This current can be continuously maintained at modest cost in power and may be used to confine the plasma. The system can operate efficiently on fusion grade tokamak plasmas.

Fisch, Nathaniel J. (Princeton, NJ); Boozer, Allen H. (Rocky Hill, NJ)

1984-01-01T23:59:59.000Z

202

Method of inhibiting dislocation generation in silicon dendritic webs  

DOE Patents [OSTI]

A method of tailoring the heat balance of the outer edge of the dendrites adjacent the meniscus to produce thinner, smoother dendrites, which have substantially less dislocation sources contiguous with the dendrites, by changing the view factor to reduce radiation cooling or by irradiating the dendrites with light from a quartz lamp or a laser to raise the temperature of the dendrites.

Spitznagel, John A. (Export, PA); Seidensticker, Raymond G. (Forest Hills, PA); McHugh, James P. (Wilkins Township, Allegheny County, PA)

1990-11-20T23:59:59.000Z

203

Systems and methods for generation of hydrogen peroxide vapor  

DOE Patents [OSTI]

A system according to one embodiment includes a moisture trap for drying air; at least one of a first container and a second container; and a mechanism for at least one of: bubbling dried air from the moisture trap through a hydrogen peroxide solution in the first container for producing a hydrogen peroxide vapor, and passing dried air from the moisture trap into a headspace above a hydrogen peroxide solution in the second container for producing a hydrogen peroxide vapor. A method according one embodiment includes at least one of bubbling dried air through a hydrogen peroxide solution in a container for producing a first hydrogen peroxide vapor, and passing dried air from the moisture trap into a headspace above the hydrogen peroxide solution in a container for producing a second hydrogen peroxide vapor. Additional systems and methods are also presented.

Love, Adam H; Eckels, Joel Del; Vu, Alexander K; Alcaraz, Armando; Reynolds, John G

2014-12-02T23:59:59.000Z

204

System and method of cylinder deactivation for optimal engine torque-speed map operation  

DOE Patents [OSTI]

This disclosure provides a system and method for determining cylinder deactivation in a vehicle engine to optimize fuel consumption while providing the desired or demanded power. In one aspect, data indicative of terrain variation is utilized in determining a vehicle target operating state. An optimal active cylinder distribution and corresponding fueling is determined from a recommendation from a supervisory agent monitoring the operating state of the vehicle of a subset of the total number of cylinders, and a determination as to which number of cylinders provides the optimal fuel consumption. Once the optimal cylinder number is determined, a transmission gear shift recommendation is provided in view of the determined active cylinder distribution and target operating state.

Sujan, Vivek A; Frazier, Timothy R; Follen, Kenneth; Moon, Suk-Min

2014-11-11T23:59:59.000Z

205

Apparatus and method for generating partially coherent illumination for photolithography  

DOE Patents [OSTI]

The present invention introduces a novel scatter plate into the optical path of source light used for illuminating a replicated object. The scatter plate has been designed to interrupt a focused, incoming light beam by introducing between about 8 to 24 diffraction zones blazed onto the surface of the scatter plate which intercept the light and redirect it to a like number of different positions in the condenser entrance pupil each of which is determined by the relative orientation and the spatial frequency of the diffraction grating in each of the several zones. Light falling onto the scatter plate, therefore, generates a plurality of unphased sources of illumination as seen by the back half of the optical system. The system comprises a high brightness source, such as a laser, creating light which is taken up by a beam forming optic which focuses the incoming light into a condenser which in turn, focuses light into a field lens creating Kohler illumination image of the source in a camera entrance pupil. The light passing through the field lens illuminates a mask which interrupts the source light as either a positive or negative image of the object to be replicated. Light passing by the mask is focused into the entrance pupil of the lithographic camera creating an image of the mask onto a receptive media.

Sweatt, William C. (Albuquerque, NM)

2001-01-01T23:59:59.000Z

206

Optimization of a stand?alone Solar PV?Wind?DG Hybrid System for Distributed Power Generation at Sagar Island  

Science Journals Connector (OSTI)

An estimation of a stand?alone solar PV and wind hybrid system for distributed power generation has been made based on the resources available at Sagar island a remote area distant to grid operation. Optimization and sensitivity analysis has been made to evaluate the feasibility and size of the power generation unit. A comparison of the different modes of hybrid system has been studied. It has been estimated that Solar PV?Wind?DG hybrid system provides lesser per unit electricity cost. Capital investment is observed to be lesser when the system run with Wind?DG compared to Solar PV?DG.

P. C. Roy; A. Majumder; N. Chakraborty

2010-01-01T23:59:59.000Z

207

Electrochemical methods for generation of a biological proton motive force  

DOE Patents [OSTI]

Disclosed are methods using neutral red to mediate the interconversion of chemical and electrical energy. Electrically reduced neutral red has been found to promote cell growth and formation of reduced products by reversibly increasing the ratio of the reduced:oxidized forms of NAD(H) or NADP(H). Electrically reduced neutral red is able to serve as the sole source of reducing power for microbial cell growth. Neutral red is also able to promote conversion of chemical energy to electrical energy by facilitating the transfer of electrons from microbial reducing power to a fuel cell cathode.

Zeikus, Joseph Gregory (Okemos, MI); Shin, Hyoun S. (Lansing, MI); Jain, Mahendra K. (Lexington, KY)

2008-12-02T23:59:59.000Z

208

Photo-voltaic power generating means and methods  

DOE Patents [OSTI]

A photo-voltaic power cell based on a photoelectric semiconductor compound and the method of using and making the same. The semiconductor compound in the photo-voltaic power cell of the present invention can be electrolytically formed at a cathode in an electrolytic solution by causing discharge or decomposition of ions or molecules of a non-metallic component with deposition of the non-metallic component on the cathode and simultaneously providing ions of a metal component which discharge and combine with the non-metallic component at the cathode thereby forming the semiconductor compound film material thereon. By stoichiometrically adjusting the amounts of the components, or otherwise by introducing dopants into the desired amounts, an N-type layer can be formed and thereafter a P-type layer can be formed with a junction therebetween. The invention is effective in producing homojunction semiconductor materials and heterojunction semiconductor materials. The present invention also provides a method of using three electrodes in order to form the semiconductor compound material on one of these electrodes. Various examples are given for manufacturing different photo-voltaic cells in accordance with the present invention.

Kroger, Ferdinand A. (Los Angeles, CA); Rod, Robert L. (Marina del Rey, CA); Panicker, Ramachandra M. P. (Camarillo, CA); Knaster, Mark B. (Ambler, PA)

1984-01-10T23:59:59.000Z

209

Photo-voltaic power generating means and methods  

DOE Patents [OSTI]

A photo-voltaic power cell based on a photoelectric semiconductor compound and the method of using and making the same. The semiconductor compound in the photo-voltaic power cell of the present invention can be electrolytically formed at a cathode in an electrolytic solution by causing discharge or decomposition of ions or molecules of a non-metallic component with deposition of the non-metallic component on the cathode and simultaneously providing ions of a metal component which discharge and combine with the non-metallic component at the cathode thereby forming the semiconductor compound film material thereon. By stoichiometrically adjusting the amounts of the components, or otherwise by introducing dopants into the desired amounts, an N-type layer can be formed and thereafter a P-type layer can be formed with a junction therebetween. The invention is effective in producing homojunction semiconductor materials and heterojunction semiconductor materials. The present invention also provides a method of using three electrodes in order to form the semiconductor compound material on one of these electrodes. Various examples are given for manufacturing different photo-voltaic cells in accordance with the present invention.

Kroger, Ferdinand A. (Santa Monica, CA); Rod, Robert L. (Marina del Rey, CA); Panicker, M. P. Ramachandra (Camarillo, CA)

1983-08-23T23:59:59.000Z

210

A general method for generating parametric Lorenz and Leimkuhler curves  

Science Journals Connector (OSTI)

Let L 0 consider an initial Lorenz curve. In this paper we propose a general methodology for obtaining new classes of parametric Lorenz or Leimkuhler curves that contain the original curve as limiting or special case. The new classes introduce additional parameters in the original family, providing more flexibility for the new families. The new classes are built from an ordered sequence of power Lorenz curves, assuming that the powers are distributed according to some convenient discrete random variable. Using this method we obtain many of the families proposed in the literature, including the classical proposal of Bradford (1934), Kakwani and Podder (1973) and others. We obtain some inequality measures and population functions for the proposed families.

José María Sarabia; Emilio Gómez-Déniz; María Sarabia; Faustino Prieto

2010-01-01T23:59:59.000Z

211

Optimal site matching of wind turbine generator: Case study of the Gulf of Suez region in Egypt  

Science Journals Connector (OSTI)

During the last few years, Egypt has emerged as the leader of wind power in the Middle East and Africa. In the Gulf of Suez region, a continuously expanding large-scale grid-connected wind farm is available at Zafarana site. The Gulf of EL-Zayt site in the Gulf of Suez region is now under extensive studies related to wind power projects such as feasibility and bird migration studies. Therefore, the Gulf of Suez region is considered in this paper for optimal site matching of wind turbine generator (WTG). This paper treats the problem of site matching of WTG through improved formulation of the capacity factor. Such factor is estimated based on Weibull PDF and an accurate model for the WTG output-power-curve. Ornithological, martial, and other limitations placed on WTG hub heights in the Gulf of Suez region in Egypt are taken into account. In addition, a MATLAB based program is created to implement the presented technique of optimal site matching of WTG. Based on turbine-performance-index (TPI) maximization, optimal output-power-curve and optimal commercial WTG are determined for each candidate site in the Gulf of Suez region. Long-term performance measurements at Zafarana wind farms in comparison with the results are used to validate the presented technique and the optimality of the results.

M. EL-Shimy

2010-01-01T23:59:59.000Z

212

Method of calculation of heat generation rates for DWPF glass. Revision 1  

SciTech Connect (OSTI)

The Waste Acceptance Preliminary Specifications (WAPS) require estimates of the heat generation rate of DWPF waste glasses. Estimates of the heat generation rates of projected glass compositions are to be reported in the Waste Form Qualification Report. Similar estimates for actual production glasses are to be reported in the Production Records. In this report, a method of calculating the heat generation rate from the radionuclide inventory is provided. Application of the method to the DWPF Design-Basis glass indicates that the heat generation rate can be accurately estimated from the Sr-90, Y-90, Cs-137, Ba-137m, and Pu-238 contents alone.

Plodinec, M.J.

1992-03-17T23:59:59.000Z

213

Method of calculation of heat generation rates for DWPF glass. Revision 2  

SciTech Connect (OSTI)

The Waste Acceptance Preliminary Specifications (WAPS) require estimates of the heat generation rate of DWPF waste glasses. Estimates of the heat generation rates of projected glass compositions are to be reported in the Waste Form Qualification Report. Similar estimates for actual production glasses are to be reported in the Production Records. In this report, a method of calculating the heat generation rate from the radionuclide inventory is provided. Application of the method to the DWPF Design-Basis glass indicates that the heat generation rate can be accurately estimated from the Sr-90, Y-90, Cs-137, Ba-137m, and Pu-238 contents alone.

Plodinec, M.J.

1993-02-04T23:59:59.000Z

214

An Optimized Adaptive Protection Scheme for Distribution Systems Penetrated with Distributed Generators  

Science Journals Connector (OSTI)

An intelligent adaptive protection scheme for distribution systems penetrated with distributed generators is proposed in this chapter. The scheme...

Ahmed H. Osman; Mohamed S. Hassan…

2014-01-01T23:59:59.000Z

215

Optimization Methods  

Science Journals Connector (OSTI)

Figure 7.12...is a generic schematic of how the important subsystems of a BCHP system (namely, primemovers, vapor compression chillers, absorption chillers and boilers) are often coupled to serve...2009). The sta...

T. Agami Reddy

2011-01-01T23:59:59.000Z

216

Concurrent Aerodynamic Optimization of Rotor Blades Using a Nash Game Method  

E-Print Network [OSTI]

Concurrent Aerodynamic Optimization of Rotor Blades Using a Nash Game Method Enric Roca Le´on Ph Aerodynamics Leader, Airbus Helicopter, Marignane, France Michel Costes Research Engineer, ONERA, Meudon OF THE AMERICAN HELICOPTER SOCIETY Abstract A multi-objective strategy adapted to the aerodynamic concurrent

Paris-Sud XI, Université de

217

An Optimal Design Method for Simulation Verification, Validation and Accreditation Schemes  

Science Journals Connector (OSTI)

With the size and complexity of simulation applications growing rapidly, it has become an important problem to design applicable and affordable verification, validation and accreditation (VV&A) schemes for complex simulation systems. To address this ... Keywords: VV&A schemes, fuzzy FMEA, fuzzy linear programming, fuzzy linear regression, optimal design method

Fei Liu; Ming Yang

2009-06-01T23:59:59.000Z

218

Optimized Waveform Relaxation Methods for the Longitudinal Partitioning of Transmission Lines  

E-Print Network [OSTI]

1 Optimized Waveform Relaxation Methods for the Longitudinal Partitioning of Transmission Lines convergence. Here we consider transmission line circuits since they represent an important part of a Spice type circuit solver. For transmission lines, the coupling between different lines is relatively weak

Gander, Martin J.

219

Multi-objective optimization of Stirling engine using non-ideal adiabatic method  

Science Journals Connector (OSTI)

Abstract In the recent years, remarkable attention is drawn to Stirling engine due to noticeable advantages, for instance a lot of resources such as biomass, fossil fuels and solar energy can be applied as heat source. Great numbers of studies are conducted on Stirling engines and non-ideal adiabatic method is one of them. In the present study, the efficiency and the power loss due to pressure drop into the heat exchangers are optimized for a Stirling system using non-ideal adiabatic analysis and the second-version Non-dominated Sorting Genetic Algorithm. The optimized answers are chosen from the results using three decision-making methods. The applied methods were compared at last and the best results were obtained for the technique for order preference by similarity to ideal solution decision making method.

Somayeh Toghyani; Alibakhsh Kasaeian; Mohammad H. Ahmadi

2014-01-01T23:59:59.000Z

220

Proposed flux-based optimization method for determination of minimum superconductor material in shield-type superconducting fault current limiters  

Science Journals Connector (OSTI)

Distributed power generation and an ever growing load demand have caused the current level of fault to exceed the nominal rating of power system devices, and fault current limiters are needed even more. The Superconducting Fault Current Limiter, SFCL, forms an efficient category of current limiters. The superconductor part in \\{SFCLs\\} is the most costly part of the device, and minimizing its volume, while maintaining the required characteristics of the device, would be very beneficial. In this work, using a Simulated Annealing optimization algorithm, a method has been proposed to determine minimum required bulk superconductor material in inductive shield-type SFCL structures. The flux linkage balance, generated by the superconductor bulk and copper winding (being the base of the optimization process), has been formulated versus dimensions. The optimum dimensions of the bulk superconductor in a model SFCL, having a limitation current of 3 A , are determined using the proposed algorithm. A prototype has been fabricated using determined dimensions, and is tested in an experimental circuit by applying different types of faults. These experimental results demonstrated satisfactory limiting characteristics of the fabricated SFCL. The optimum volume of the bulk superconductor material needed for fabrication of larger scale \\{SFCLs\\} has been calculated and compared with the volume of superconductors employed in worldwide SFCL projects.

A. Hekmati; M. Vakilian; M. Fardmanesh

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "generation optimization methods" 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

Optimization of power generation from a set of low-temperature abandoned gas wells, using organic Rankine cycle  

Science Journals Connector (OSTI)

This research article deals with the employment of organic Rankine cycle (ORC) to generate electricity from a set of low-temperature abandoned gas wells in Iran. At first a thermodynamic analysis was performed to select an appropriate power cycle; consequently organic Rankine cycle was chosen. Then a comprehensive investigation was carried out to find a typical low-temperature abandoned gas reservoir so an abandoned gas reservoir in the central part of Iran was considered. The next step was selecting the working fluid; in this regard a vast range of common organic fluids were studied and R125 was chosen. Finally the gas well and the power plant were simulated and then a parametric optimization of the ORC plant was performed in order to achieve optimum power generation and also to compute generated power at different operational parameters of gas wells and power cycle.

Mahyar Ebrahimi; Seyed Ebrahim Moussavi Torshizi

2012-01-01T23:59:59.000Z

222

An enhanced algorithm for protocol conformance test sequence generation based on the UIO method  

E-Print Network [OSTI]

An Enhanced Algorithm for Protocol Conformance Test Sequence Generation Based on the UIO Method. (December 1993) Ravindra Allada, B.E., Osmania University, Hyderabad, India Chair of Advisory Committee: Dr. Hosame Abu-Amara A computer protocol is a...

Allada, Ravindra

2012-06-07T23:59:59.000Z

223

An analytic electromagnetic calculation method for performance evolution of doubly fed induction generators for wind turbines  

Science Journals Connector (OSTI)

An analytic electromagnetic calculation method for doubly fed induction generator (DFIG) in wind turbine system was presented. ... steady state equivalent circuit and basic equations of DFIG, the modeling for ele...

Wen-juan Zhang ???; Shou-dao Huang ???; Jian Gao ??…

2013-10-01T23:59:59.000Z

224

The Optimal Power Tracking Control Strategy of Grid-Connected Excited Synchronous Wind Power Generator.  

E-Print Network [OSTI]

??In this thesis, the wind power system is a coaxial coupling structure between servo motor and excited synchronous wind power generator. By using the excited… (more)

Cheng, Wen-kai

2014-01-01T23:59:59.000Z

225

Method for generating a highly reactive plasma for exhaust gas aftertreatment and enhanced catalyst reactivity  

DOE Patents [OSTI]

A method for non-thermal plasma aftertreatment of exhaust gases the method comprising the steps of providing short risetime (about 40 ps), high frequency (about 5G hz), high power bursts of low-duty factor microwaves sufficient to generate a dielectric barrier discharge and passing a gas to treated through the discharge so as to cause dissociative reduction of the exhaust gases. The invention also includes a reactor for generating the non-thermal plasma.

Whealton, John H. (Oak Ridge, TN); Hanson, Gregory R. (Clinton, TN); Storey, John M. (Oak Ridge, TN); Raridon, Richard J. (Oak Ridge, TN); Armfield, Jeffrey S. (Upsilanti, MI); Bigelow, Timothy S. (Knoxville, TN); Graves, Ronald L. (Knoxville, TN)

2001-01-01T23:59:59.000Z

226

Optimal Placement of the Wind Generators in the Medium Voltage Power Grid  

Science Journals Connector (OSTI)

The minimization of power losses in the medium voltage (MV) grid requires adjustment of network of power sources. This problem is particularly important for renewable energy sources, for example for the farms of wind generators. Their placement and nominal ... Keywords: medium voltage power grid, wind generators, genetic algorithms, parallel processing

Andrzej Jordan; Ryszard Szczebiot; Carsten Maple; Slawomir Cieslik

2011-04-01T23:59:59.000Z

227

Multi-Objective Optimization Analysis of Post-Fukushima Power Generation Planning in Japan with Considering Nuclear Power’s Risk Cost  

Science Journals Connector (OSTI)

In the present study, multi-objective optimization analysis was conducted on the post-Fukushima power generation planning in Japan up to 2030 from economic and environmental perspectives with considering nuclear

Qi Zhang; Tetsuo Tezuka; Keiichi Ishihara

2013-01-01T23:59:59.000Z

228

Regionalized LCA-Based Optimization of Building Energy Supply: Method and Case Study for a Swiss Municipality  

Science Journals Connector (OSTI)

Regionalized LCA-Based Optimization of Building Energy Supply: Method and Case Study for a Swiss Municipality ... This paper presents a regionalized LCA-based multiobjective optimization model of building energy demand and supply for the case of a Swiss municipality for the minimization of greenhouse gas emissions and particulate matter formation. ... A suitable method for such analyses is life cycle assessment (LCA). ...

Dominik Saner; Carl Vadenbo; Bernhard Steubing; Stefanie Hellweg

2014-05-27T23:59:59.000Z

229

Single-particle degrees of freedom and the generator-coordinate method  

Science Journals Connector (OSTI)

The generator-coordinate method which is usually used to describe collective degrees of freedom is extended to include two quasiparticle excitations and the coupling between these two different modes. As generating wave functions angular momentum and particle number projected Hartree-Fock-Bogoliubov states and quasiparticle excitations built on them are used. The Hartree-Fock-Bogoliubov functions are constrained to a given quadrupole moment, which serves as the generator coordinate. This method is applied to the pf- shell nuclei Ti46,50, Cr52, and Fe54.NUCLEAR STRUCTURE Generator coordinate method; Hartree-Fock-Bogoliubov approach; angular momentum projection; particle number projection; two-quasiparticle configurations; nuclear structure calculation in Ti, Cr, and Fe.

H. Müther; K. Goeke; K. Allaart; Amand Faessler

1977-04-01T23:59:59.000Z

230

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

231

Optimal homotopy asymptotic method for solving Volterra integral equation of first kind  

Science Journals Connector (OSTI)

Abstract In this paper, authors demonstrate the efficiency of optimal homotopy asymptotic method (OHAM). This is done by solving nonlinear Volterra integral equation of first kind. OHAM is applied to Volterra integral equations which involves exponential, trigonometric function as their kernels. It is observed that solution obtained by OHAM is more accurate than existing techniques, which proves its validity and stability for solving Volterra integral equation of first kind.

N. Khan; M.S. Hashmi; S. Iqbal; T. Mahmood

2014-01-01T23:59:59.000Z

232

Experimental and thermodynamical analyses of the diesel exhaust vortex generator heat exchanger for optimizing its operating condition  

Science Journals Connector (OSTI)

Abstract In this research, a vortex generator heat exchanger is used to recover exergy from the exhaust of an OM314 diesel engine. Twenty vortex generators with 30° angle of attack are used to increase the heat recovery as well as the low back pressure in the exhaust. The experiments are prepared for five engine loads (0, 20, 40, 60 and 80% of full load), two exhaust gases amount (50 and 100%) and four water mass flow rates (50, 40, 30 and 20 g/s). After a thermodynamical analysis on the obtained data, an optimization study based on Central Composite Design (CCD) is performed due to complex effect of engine loads and water mass flow rates on exergy recovery and irreversibility to reach the best operating condition.

M. Hatami; D.D. Ganji; M. Gorji-Bandpy

2015-01-01T23:59:59.000Z

233

An optimized co-ordinated approach for harmonic minimization of Doubly Fed Induction Generator connected micro-grid system  

Science Journals Connector (OSTI)

Abstract This paper illustrates the biogeography based optimization (BBO) based selected harmonic elimination technique for \\{DFIGs\\} connected to a micro-grid. The lower order harmonics are individually eliminated in each DFIG outputs but the higher order harmonics are eliminated in such a way that the harmonics generated by one source is eliminated by the other after generating the same order of harmonics in opposite phase. The switching angles are computed off-line and stored in microcontroller memory in the form of look-up tables for on line application. The excitation power for the inverters is obtained from a photovoltaic (PV) panel. Proper simulations are executed for the proposed theory and subsequently supported by investigational verifications. Both the simulation and experiments agree well with the analytical formulation. The total harmonic distortion (THD) in the output is found to be within the stipulated limit.

Krishna Sarker; Debashis Chatterjee; S.K. Goswami

2015-01-01T23:59:59.000Z

234

Optimization of accelerator parameters using normal form methods on high-order transfer maps  

SciTech Connect (OSTI)

Methods of analysis of the dynamics of ensembles of charged particles in collider rings are developed. The following problems are posed and solved using normal form transformations and other methods of perturbative nonlinear dynamics: (1) Optimization of the Tevatron dynamics: (a) Skew quadrupole correction of the dynamics of particles in the Tevatron in the presence of the systematic skew quadrupole errors in dipoles; (b) Calculation of the nonlinear tune shift with amplitude based on the results of measurements and the linear lattice information; (2) Optimization of the Muon Collider storage ring: (a) Computation and optimization of the dynamic aperture of the Muon Collider 50 x 50 GeV storage ring using higher order correctors; (b) 750 x 750 GeV Muon Collider storage ring lattice design matching the Tevatron footprint. The normal form coordinates have a very important advantage over the particle optical coordinates: if the transformation can be carried out successfully (general restrictions for that are not much stronger than the typical restrictions imposed on the behavior of the particles in the accelerator) then the motion in the new coordinates has a very clean representation allowing to extract more information about the dynamics of particles, and they are very convenient for the purposes of visualization. All the problem formulations include the derivation of the objective functions, which are later used in the optimization process using various optimization algorithms. Algorithms used to solve the problems are specific to collider rings, and applicable to similar problems arising on other machines of the same type. The details of the long-term behavior of the systems are studied to ensure the their stability for the desired number of turns. The algorithm of the normal form transformation is of great value for such problems as it gives much extra information about the disturbing factors. In addition to the fact that the dynamics of particles is represented in a way that is easy to understand, such important characteristics as the strengths of the resonances and the tune shifts with amplitude and various parameters of the system are calculated. Each major section is supplied with the results of applying various numerical optimization methods to the problems stated. The emphasis is made on the efficiency comparison of various approaches and methods. The main simulation tool is the arbitrary order code COSY INFINITY written by M. Berz, K. Makino, et al. at Michigan State University. Also, the code MAD is utilized to design the 750 x 750 GeV Muon Collider storage ring baseline lattice.

Snopok, Pavel; /Michigan State U.

2007-05-01T23:59:59.000Z

235

Tensor product methods and entanglement optimization for ab initio quantum chemistry  

E-Print Network [OSTI]

The treatment of high-dimensional problems such as the Schr\\"odinger equation can be approached by concepts of tensor product approximation. We present general techniques that can be used for the treatment of high-dimensional optimization tasks and time-dependent equations, and connect them to concepts already used in many-body quantum physics. Based on achievements from the past decade, entanglement-based methods, -- developed from different perspectives for different purposes in distinct communities already matured to provide a variety of tools -- can be combined to attack highly challenging problems in quantum chemistry. The aim of the present paper is to give a pedagogical introduction to the theoretical background of this novel field and demonstrate the underlying benefits through numerical applications on a text book example. Among the various optimization tasks we will discuss only those which are connected to a controlled manipulation of the entanglement which is in fact the key ingredient of the methods considered in the paper. The selected topics will be covered according to a series of lectures given on the topic "New wavefunction methods and entanglement optimizations in quantum chemistry" at the Workshop on Theoretical Chemistry, 18 - 21 February 2014, Mariapfarr, Austria.

Szilárd Szalay; Max Pfeffer; Valentin Murg; Gergely Barcza; Frank Verstraete; Reinhold Schneider; Örs Legeza

2014-12-18T23:59:59.000Z

236

Evaluation Of Methods To Measure Hydrogen Generation Rate In A Shielded Cell Environment And A Method Recommendation  

SciTech Connect (OSTI)

The purpose of this document is to describe the current state of the art for determination of hydrogen generation rates of radioactive slurries and solutions to provide a basis for design, fabrication, testing, and implementation of a measurement method for Hydrogen Generation Rate (HGR) during qualification of waste feeds for the Hanford Waste Treatment and Immobilization Plant (WTP). The HGR measurement will be performed on samples of the Low Activity Waste (LAW) and High Level Waste (HLW) staged waste feeds for the WTP as well as on samples from selected unit operations testing during the qualification program. SRNL has performed a review of techniques utilized to measure HGR of high level radioactive waste slurries, evaluated the Hanford 222-S Laboratory method for measurement of hydrogen, and reviewed the hydrogen generation rate models for Hanford waste.Based on the literature review, method evaluation, and SRNL experience with measuring hydrogen generation rate, SRNL recommends that a continuous flow system with online gas analysis be used as the HGR measurement method during waste qualification.

Stone, M. E.

2012-11-07T23:59:59.000Z

237

Device and method for generating a beam of acoustic energy from a borehole, and applications thereof  

DOE Patents [OSTI]

In some aspects of the invention, a method of generating a beam of acoustic energy in a borehole is disclosed. The method includes generating a first acoustic wave at a first frequency; generating a second acoustic wave at a second frequency different than the first frequency, wherein the first acoustic wave and second acoustic wave are generated by at least one transducer carried by a tool located within the borehole; transmitting the first and the second acoustic waves into an acoustically non-linear medium, wherein the composition of the non-linear medium produces a collimated beam by a non-linear mixing of the first and second acoustic waves, wherein the collimated beam has a frequency based upon a difference between the first frequency and the second frequency; and transmitting the collimated beam through a diverging acoustic lens to compensate for a refractive effect caused by the curvature of the borehole.

Vu, Cung Khac; Sinha, Dipen N; Pantea, Cristian; Nihei, Kurt T; Schmitt, Denis P; Skelt, Christopher

2013-10-01T23:59:59.000Z

238

Time-resolved spectroscopy of plasma plumes: A versatile approach for optimization of high-order harmonic generation in laser plasma  

SciTech Connect (OSTI)

The time-resolved studies of laser-produced Ag, In, Pt, V, Mn, and Ga plasmas are presented from the point of view of plasma application as the nonlinear optical medium for high-order harmonic generation of laser radiation. We show that optimization of plasma formation using this technique allows the enhancement of harmonic generation efficiency and extension of maximal harmonic order.

Ganeev, R. A. [Institut national de la recherche scientifique, Centre Energie, Materiaux et Telecommunications, 1650 Lionel-Boulet, Varennes, Quebec J3X 1S2 (Canada); Institute of Electronics, Akademgorodok, 33 Dormon Yoli street, Tashkent 100125 (Uzbekistan); Elouga Bom, L. B.; Ozaki, T. [Institut national de la recherche scientifique, Centre Energie, Materiaux et Telecommunications, 1650 Lionel-Boulet, Varennes, Quebec J3X 1S2 (Canada)

2011-08-15T23:59:59.000Z

239

Optimal Placement of Wind Generators in Medium Voltage Power Grids -- Investigations of Genetic Algorithm  

Science Journals Connector (OSTI)

The paper presents investigations of a genetic algorithm for computations of power losses in the MV power grid. In this case, the vector of start population PO0 and mutation likelihood was investigated. Diagrams of power losses in the grid dependent ... Keywords: genetic algorithm, wind generators, power grid, parallel processing, MPI

Andrzej Jordan; Carsten Maple; Ryszard Szczebiot; Lukasz Swierczewski

2011-04-01T23:59:59.000Z

240

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

Note: This page contains sample records for the topic "generation optimization methods" from the National Library of EnergyBeta (NLEBeta).
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241

Optimal sizing study of hybrid wind/PV/diesel power generation unit  

SciTech Connect (OSTI)

In this paper, a methodology of sizing optimization of a stand-alone hybrid wind/PV/diesel energy system is presented. This approach makes use of a deterministic algorithm to suggest, among a list of commercially available system devices, the optimal number and type of units ensuring that the total cost of the system is minimized while guaranteeing the availability of the energy. The collection of 6 months of data of wind speed, solar radiation and ambient temperature recorded for every hour of the day were used. The mathematical modeling of the main elements of the hybrid wind/PV/diesel system is exposed showing the more relevant sizing variables. A deterministic algorithm is used to minimize the total cost of the system while guaranteeing the satisfaction of the load demand. A comparison between the total cost of the hybrid wind/PV/diesel energy system with batteries and the hybrid wind/PV/diesel energy system without batteries is presented. The reached results demonstrate the practical utility of the used sizing methodology and show the influence of the battery storage on the total cost of the hybrid system. (author)

Belfkira, Rachid; Zhang, Lu; Barakat, Georges [Groupe de Recherche en Electrotechnique et Automatique du Havre, University of Le Havre, 25 rue Philippe Lebon, BP 1123, 76063 Le Havre (France)

2011-01-15T23:59:59.000Z

242

Method and apparatus for generating radiation utilizing DC to AC conversion with a conductive front  

DOE Patents [OSTI]

Method and apparatus for generating radiation of high power, variable duration and broad tunability over several orders of magnitude from a laser-ionized gas-filled capacitor array. The method and apparatus convert a DC electric field pattern into a coherent electromagnetic wave train when a relativistic ionization front passes between the capacitor plates. The frequency and duration of the radiation is controlled by the gas pressure and capacitor spacing.

Dawson, John M. (Pacific Palisades, CA); Mori, Warren B. (Hermosa Beach, CA); Lai, Chih-Hsiang (So. Pasadena, CA); Katsouleas, Thomas C. (Malibu, CA)

1998-01-01T23:59:59.000Z

243

Method and apparatus for generating radiation utilizing DC to AC conversion with a conductive front  

DOE Patents [OSTI]

Method and apparatus ar disclosed for generating radiation of high power, variable duration and broad tunability over several orders of magnitude from a laser-ionized gas-filled capacitor array. The method and apparatus convert a DC electric field pattern into a coherent electromagnetic wave train when a relativistic ionization front passes between the capacitor plates. The frequency and duration of the radiation is controlled by the gas pressure and capacitor spacing. 4 figs.

Dawson, J.M.; Mori, W.B.; Lai, C.H.; Katsouleas, T.C.

1998-07-14T23:59:59.000Z

244

Using A High-Temperature Hydrogen Co-Generation Reactor To Optimize Both Economic and Environmental Performance  

SciTech Connect (OSTI)

This paper reports the analysis of outcomes for a 3000 MWt HTGR plant, given price and cost assumptions, and determines what level of hydrogen and electricity production would optimize the plant economically and environmentally (carbon reduction). Coupling nuclear power with hydrogen production could fundamentally alter the character of the nuclear industry and nuclear technology’s development path. For this to happen, the hydrogen economy will have to be realized, and a new generation of reactors technically suitable to co-production of hydrogen with electric power must be developed and proven. The paper shows that the tradeoff between producing hydrogen through steam methane reformation and producing electricity is disproportionate and would require significant price increases for electricity to change the outcomes. It also found that estimate of shadow values for carbon credits was in the range now under discussion.

Weimar, Mark R.; Wood, Thomas W.; Reichmuth, Barbara A.; Johnson, Wayne L.

2004-07-01T23:59:59.000Z

245

Microsoft Word - Optimal_Performance_of_Hybrid_Generation_2011-05-24.docx  

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

and Economic Analysis of and Economic Analysis of Various Power Generation Resources Coupled with CAES Systems May 17, 2011 DOE/NETL-2011/1472 Disclaimer This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement,

246

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

247

Gauss-Jordan Method (GJ) Matrix Multiplication Linear Independence (LI) Rank Inverse Math 364: Principles of Optimization, Lecture 2  

E-Print Network [OSTI]

Gauss-Jordan Method (GJ) Matrix Multiplication Linear Independence (LI) Rank Inverse Math 364 University Spring 2012 Haijun Li Math 364: Principles of Optimization, Lecture 2 Spring 2012 1 / 15 #12;Gauss-Jordan and methods from linear algebra, including Gauss-Jordan method, matrix multiplication, linear independence

Li, Haijun

248

The use of least squares methods in functional optimization of energy use prediction models  

Science Journals Connector (OSTI)

The least squares method (LSM) is used to optimize the coefficients of a closed-form correlation that predicts the annual energy use of buildings based on key envelope design and thermal parameters. Specifically annual energy use is related to a number parameters like the overall heat transfer coefficients of the wall roof and glazing glazing percentage and building surface area. The building used as a case study is a previously energy-audited mosque in a suburb of Kuwait City Kuwait. Energy audit results are used to fine-tune the base case mosque model in the VisualDOE{trade mark serif} software. Subsequently 1625 different cases of mosques with varying parameters were developed and simulated in order to provide the training data sets for the LSM optimizer. Coefficients of the proposed correlation are then optimized using multivariate least squares analysis. The objective is to minimize the difference between the correlation-predicted results and the VisualDOE-simulation results. It was found that the resulting correlation is able to come up with coefficients for the proposed correlation that reduce the difference between the simulated and predicted results to about 0.81%. In terms of the effects of the various parameters the newly-defined weighted surface area parameter was found to have the greatest effect on the normalized annual energy use. Insulating the roofs and walls also had a major effect on the building energy use. The proposed correlation and methodology can be used during preliminary design stages to inexpensively assess the impacts of various design variables on the expected energy use. On the other hand the method can also be used by municipality officials and planners as a tool for recommending energy conservation measures and fine-tuning energy codes.

2012-01-01T23:59:59.000Z

249

A Matlab mesh generator for the two-dimensional finite element method  

Science Journals Connector (OSTI)

Abstract A new Matlab code for the generation of unstructured (3-node or 6-node) triangular meshes in two dimensions is proposed. The method is based on the Matlab mesh generator distmesh of Persson and Strang (2004). As input, the code takes a signed distance function for the domain geometry. A mesh size function, for the spatial node distribution, is constructed using an approximate medial axis. As outputs, the code generates a 3-node or a 6-node triangular mesh with boundary data (edges and nodes). The approach presented consists of three steps: (1) an initial nodes placement is obtained using a probabilistic node distribution, (2) an iterative smoothing is performed assuming the presence of an attractive/repulsive internode force, and (3) a fast refinement procedure is performed for 6-node triangular meshes or large scale meshes.

Jonas Koko

2015-01-01T23:59:59.000Z

250

Discretization error estimation and exact solution generation using the method of nearby problems.  

SciTech Connect (OSTI)

The Method of Nearby Problems (MNP), a form of defect correction, is examined as a method for generating exact solutions to partial differential equations and as a discretization error estimator. For generating exact solutions, four-dimensional spline fitting procedures were developed and implemented into a MATLAB code for generating spline fits on structured domains with arbitrary levels of continuity between spline zones. For discretization error estimation, MNP/defect correction only requires a single additional numerical solution on the same grid (as compared to Richardson extrapolation which requires additional numerical solutions on systematically-refined grids). When used for error estimation, it was found that continuity between spline zones was not required. A number of cases were examined including 1D and 2D Burgers equation, the 2D compressible Euler equations, and the 2D incompressible Navier-Stokes equations. The discretization error estimation results compared favorably to Richardson extrapolation and had the advantage of only requiring a single grid to be generated.

Sinclair, Andrew J. (Auburn University Auburn, AL); Raju, Anil (Auburn University Auburn, AL); Kurzen, Matthew J. (Virginia Tech Blacksburg, VA); Roy, Christopher John (Virginia Tech Blacksburg, VA); Phillips, Tyrone S. (Virginia Tech Blacksburg, VA)

2011-10-01T23:59:59.000Z

251

Device and method for generating a beam of acoustic energy from a borehole, and applications thereof  

DOE Patents [OSTI]

In some aspects of the invention, a method of generating a beam of acoustic energy in a borehole is disclosed. The method includes generating a first broad-band acoustic pulse at a first broad-band frequency range having a first central frequency and a first bandwidth spread; generating a second broad-band acoustic pulse at a second broad-band frequency range different than the first frequency range having a second central frequency and a second bandwidth spread, wherein the first acoustic pulse and second acoustic pulse are generated by at least one transducer arranged on a tool located within the borehole; and transmitting the first and the second broad-band acoustic pulses into an acoustically non-linear medium, wherein the composition of the non-linear medium produces a collimated pulse by a non-linear mixing of the first and second acoustic pulses, wherein the collimated pulse has a frequency equal to the difference in frequencies between the first central frequency and the second central frequency and a bandwidth spread equal to the sum of the first bandwidth spread and the second bandwidth spread.

Vu, Cung Khac; Sinha, Dipen N; Pantea, Cristian; Nihei, Kurt T; Schmitt, Denis P; Skelt, Christopher

2013-10-01T23:59:59.000Z

252

Review of uncertainty-based multidisciplinary design optimization methods for aerospace vehicles  

Science Journals Connector (OSTI)

This paper presents a comprehensive review of Uncertainty-Based Multidisciplinary Design Optimization (UMDO) theory and the state of the art in UMDO methods for aerospace vehicles. UMDO has been widely acknowledged as an advanced methodology to address competing objectives of aerospace vehicle design, such as performance, cost, reliability and robustness. However the major challenges of UMDO, namely the computational complexity and organizational complexity caused by both time-consuming disciplinary analysis models and UMDO algorithms, still greatly hamper its application in aerospace engineering. In recent years there is a surge of research in this field aiming at solving these problems. The purpose of this paper is to review these existing approaches systematically, highlight research challenges and opportunities, and help guide future efforts. Firstly, the UMDO theory preliminaries are introduced to clarify the basic UMDO concepts and mathematical formulations, as well as provide a panoramic view of the general UMDO solving process. Then following the UMDO solving process, research progress of each key step is separately surveyed and discussed, specifically including uncertainty modeling, uncertainty propagation and analysis, optimization under uncertainty, and UMDO procedure. Finally some conclusions are given, and future research trends and prospects are discussed.

Wen Yao; Xiaoqian Chen; Wencai Luo; Michel van Tooren; Jian Guo

2011-01-01T23:59:59.000Z

253

Hydrodynamic Optimization Method and Design Code for Stall-Regulated Hydrokinetic Turbine Rotors  

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

5021 5021 August 2009 Hydrodynamic Optimization Method and Design Code for Stall-Regulated Hydrokinetic Turbine Rotors D. Sale University of Tennessee J. Jonkman and W. Musial National Renewable Energy Laboratory Presented at the ASME 28 th International Conference on Ocean, Offshore, and Arctic Engineering Honolulu, Hawaii May 31-June 5, 2009 NOTICE The submitted manuscript has been offered by an employee of the Alliance for Sustainable Energy, LLC (ASE), a contractor of the US Government under Contract No. DE-AC36-08-GO28308. Accordingly, the US Government and ASE retain a nonexclusive royalty-free license to publish or reproduce the published form of this contribution, or allow others to do so, for US Government purposes. This report was prepared as an account of work sponsored by an agency of the United States government.

254

Integrating modified Delphi method with fuzzy AHP for optimal power substation location selection  

Science Journals Connector (OSTI)

Evaluation and selection of power substation location is an important strategic decision making problem for both public and private sector. The multi-dimensional, multi-criteria nature of the power substation location problem limits the usefulness of any particular single objective model. Studies have shown that electromagnetic radiations emanating from the high voltage lines and substations, pose serious adverse health consequences to living beings. In this study, social, technological, economical, environmental and site characteristics factors and sub criteria, have been derived to make the optimal power substation location selection decision more realistic and effectual. In this paper, an improved and more appropriate power substation location evaluation and selection model has been developed by integrating Modified Delphi method with Fuzzy Analytic Hierarchy Process (FAHP). A numerical example is presented to show applicability and performance of the proposed methodology followed by a sensitivity analysis to discuss and explain the results.

Golam Kabir; M. Ahsan Akhtar Hasin

2013-01-01T23:59:59.000Z

255

Concentration solar power optimization system and method of using the same  

DOE Patents [OSTI]

A system and method for optimizing at least one mirror of at least one CSP system is provided. The system has a screen for displaying light patterns for reflection by the mirror, a camera for receiving a reflection of the light patterns from the mirror, and a solar characterization tool. The solar characterization tool has a characterizing unit for determining at least one mirror parameter of the mirror based on an initial position of the camera and the screen, and a refinement unit for refining the determined parameter(s) based on an adjusted position of the camera and screen whereby the mirror is characterized. The system may also be provided with a solar alignment tool for comparing at least one mirror parameter of the mirror to a design geometry whereby an alignment error is defined, and at least one alignment unit for adjusting the mirror to reduce the alignment error.

Andraka, Charles E

2014-03-18T23:59:59.000Z

256

Method for optimizing output in ultrashort-pulse multipass laser amplifiers with selective use of a spectral filter  

DOE Patents [OSTI]

A method for optimizing multipass laser amplifier output utilizes a spectral filter in early passes but not in later passes. The pulses shift position slightly for each pass through the amplifier, and the filter is placed such that early passes intersect the filter while later passes bypass it. The filter position may be adjust offline in order to adjust the number of passes in each category. The filter may be optimized for use in a cryogenic amplifier.

Backus, Sterling J. (Erie, CO); Kapteyn, Henry C. (Boulder, CO)

2007-07-10T23:59:59.000Z

257

An optimal penalty method for a hyperbolic system modeling the edge plasma transport in a tokamak  

Science Journals Connector (OSTI)

Abstract The penalization method is used to take account of obstacles, such as the limiter, in a tokamak. Because of the magnetic confinement of the plasma in a tokamak, the transport occurs essentially in the direction parallel to the magnetic field lines. We study a 1D nonlinear hyperbolic system as a simplified model of the plasma transport in the area close to the wall. A penalization which cuts the flux term of the momentum is studied. We show numerically that this penalization creates a Dirac measure at the plasma-limiter interface which prevents us from defining the transport term in the usual distribution sense. Hence, a new penalty method is proposed for this hyperbolic system. For this penalty method, an asymptotic expansion and numerical tests give an optimal rate of convergence without spurious boundary layer. Another two-fields penalization has also been implemented and the numerical convergence analysis when the penalization parameter tends to 0 reveals the presence of a boundary layer.

Philippe Angot; Thomas Auphan; Olivier Guès

2014-01-01T23:59:59.000Z

258

Method and apparatus for steam mixing a nuclear fueled electricity generation system  

DOE Patents [OSTI]

A method and apparatus for improving the efficiency and performance of a nuclear electrical generation system that comprises the addition of steam handling equipment to an existing plant that results in a surprising increase in plant performance. More particularly, a gas turbine electrical generation system with heat recovery boiler is installed along with a micro-jet high pressure and a low pressure mixer superheater. Depending upon plant characteristics, the existing moisture separator reheater (MSR) can be either augmented or done away with. The instant invention enables a reduction in T.sub.hot without a derating of the reactor unit, and improves efficiency of the plant's electrical conversion cycle. Coupled with this advantage is a possible extension of the plant's fuel cycle length due to an increased electrical conversion efficiency. The reduction in T.sub.hot further allows for a surprising extension of steam generator life. An additional advantage is the reduction in erosion/corrosion of secondary system components including turbine blades and diaphragms. The gas turbine generator used in the instant invention can also replace or augment existing peak or emergency power needs. Another benefit of the instant invention is the extension of plant life and the reduction of downtime due to refueling.

Tsiklauri, Georgi V. (Richland, WA); Durst, Bruce M. (Kennewick, WA)

1996-01-01T23:59:59.000Z

259

A simple and direct method for generating travelling wave solutions for nonlinear equations  

SciTech Connect (OSTI)

We propose a simple and direct method for generating travelling wave solutions for nonlinear integrable equations. We illustrate how nontrivial solutions for the KdV, the mKdV and the Boussinesq equations can be obtained from simple solutions of linear equations. We describe how using this method, a soliton solution of the KdV equation can yield soliton solutions for the mKdV as well as the Boussinesq equations. Similarly, starting with cnoidal solutions of the KdV equation, we can obtain the corresponding solutions for the mKdV as well as the Boussinesq equations. Simple solutions of linear equations can also lead to cnoidal solutions of nonlinear systems. Finally, we propose and solve some new families of KdV equations and show how soliton solutions are also obtained for the higher order equations of the KdV hierarchy using this method.

Bazeia, D. [Departamento de Fisica, Universidade Federal da Paraiba, 58051-970 Joao Pessoa, PB (Brazil)], E-mail: bazeia@fisica.ufpb.br; Das, Ashok [Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627-0171 (United States); Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Calcutta 700064 (India); Losano, L. [Departamento de Fisica, Universidade Federal da Paraiba, 58051-970 Joao Pessoa, PB (Brazil); Silva, A. [Departamento de Fisica, Universidade Federal da Paraiba, 58051-970 Joao Pessoa, PB (Brazil); Departamento de Fisica, Universidade Estadual da Paraiba, Campina Grande, PB (Brazil)

2008-05-15T23:59:59.000Z

260

Magnetic filter apparatus and method for generating cold plasma in semicoductor processing  

DOE Patents [OSTI]

Disclosed herein is a system and method for providing a plasma flood having a low electron temperature to a semiconductor target region during an ion implantation process. The plasma generator providing the plasma is coupled to a magnetic filter which allows ions and low energy electrons to pass therethrough while retaining captive the primary or high energy electrons. The ions and low energy electrons form a "cold plasma" which is diffused in the region of the process surface while the ion implantation process takes place.

Vella, Michael C. (San Leandro, CA)

1996-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "generation optimization methods" 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

Magnetic filter apparatus and method for generating cold plasma in semiconductor processing  

DOE Patents [OSTI]

Disclosed herein is a system and method for providing a plasma flood having a low electron temperature to a semiconductor target region during an ion implantation process. The plasma generator providing the plasma is coupled to a magnetic filter which allows ions and low energy electrons to pass therethrough while retaining captive the primary or high energy electrons. The ions and low energy electrons form a ``cold plasma`` which is diffused in the region of the process surface while the ion implantation process takes place. 15 figs.

Vella, M.C.

1996-08-13T23:59:59.000Z

262

Extension of the basis generator method for application to laser-molecule interactions  

Science Journals Connector (OSTI)

We present an extension of the basis generator method, which was successfully used for ion-atom collisions in previous works, and apply it to a laser-molecule problem. As test system, we have chosen the one-electron, diatomic and asymmetric molecule HeH2+ in a short (approximately fs) intense laser field. Due to the asymmetry of the molecule, excitation and ionization probabilities are different if the main peak of the laser pulse is parallel or antiparallel to the molecular dipole moment. Our results are in fair agreement with previous calculations for this system.

L. Fernández-Menchero; T. Kirchner; H. J. Lüdde

2009-02-13T23:59:59.000Z

263

Optimization of solar assisted ground source heat pump system for space heating application by Taguchi method and utility concept  

Science Journals Connector (OSTI)

Abstract In the present research, a methodology is proposed to optimize the solar collector area and ground heat exchanger length for achieving higher COP of Solar Assisted Ground Source Heat Pump (SAGSHP) system using Taguchi method and utility concept. Four operating parameters for solar collector and four parameters for ground heat exchanger have been selected with mixed level variation using an L18 (21, 37) orthogonal array. The key parameters such as solar collector area, ground heat exchanger length and COP of the SAGSHP system are optimized to predict the best levels of operating parameters for maximum COP of SAGSHP system. Lower the better concept has been used for the solar collector area and ground heat exchanger length whereas higher the better concept has been employed for the COP of SAGSHP system and the results have been analyzed for the optimum conditions using signal-to-noise (SN) ratio and ANOVA method. Computations were carried out for 18 experimental trial runs by considering 2 ton heating load in winter season. The optimum COP for SAGSHP was estimated to be 4.23 from the utility concept, which is 8.74% higher than the optimum COP predicted by Taguchi optimization. Optimization of solar collector area and ground heat exchanger length by the utility concept has shown only about 2.3% reduction in area and 1.6% reduction in length respectively compared to those values optimized by the Taguchi method.

Vikas Verma; K. Murugesan

2014-01-01T23:59:59.000Z

264

Optimization Online - Certificates of Optimality and Sensitivity ...  

E-Print Network [OSTI]

Dec 9, 2014 ... Certificates of Optimality and Sensitivity Analysis using Generalized Subadditive Generator Functions: A test study on Knapsack Problems.

Babak Moazzez

2014-12-09T23:59:59.000Z

265

Method of controlling temperature of a thermoelectric generator in an exhaust system  

DOE Patents [OSTI]

A method of controlling the temperature of a thermoelectric generator (TEG) in an exhaust system of an engine is provided. The method includes determining the temperature of the heated side of the TEG, determining exhaust gas flow rate through the TEG, and determining the exhaust gas temperature through the TEG. A rate of change in temperature of the heated side of the TEG is predicted based on the determined temperature, the determined exhaust gas flow rate, and the determined exhaust gas temperature through the TEG. Using the predicted rate of change of temperature of the heated side, exhaust gas flow rate through the TEG is calculated that will result in a maximum temperature of the heated side of the TEG less than a predetermined critical temperature given the predicted rate of change in temperature of the heated side of the TEG. A corresponding apparatus is provided.

Prior, Gregory P; Reynolds, Michael G; Cowgill, Joshua D

2013-05-21T23:59:59.000Z

266

Optimization based methods for solving some problems in telecommunications and the internet.  

E-Print Network [OSTI]

??The purpose of this thesis is to develop some new algorithms based on optimization techniques for solving some problems in some areas of telecommunications and… (more)

Jia, Long

2005-01-01T23:59:59.000Z

267

Domain Decomposition Methods in Optimal Flow Control for High Performance Computing.  

E-Print Network [OSTI]

??This thesis is concerned with linear and non-linear optimal flow control problems which are modeled by systems of partial differential equations. The numerical treatment of… (more)

Ketelaer, Eva

2013-01-01T23:59:59.000Z

268

Cost reduction of distribution network protection in presence of distributed generation using optimized fault current limiter allocation  

Science Journals Connector (OSTI)

Using Solid State Fault Current Limiters (SSFCLs) has been proposed as a potential cost-efficient candidate to minimize the effect of exposing Distributed Generation (DG) to the distribution system. Genetic Algorithm (GA) is employed to find the optimum number, location and size of \\{FCLs\\} to be used in the network. The numerical and simulation results show the efficiency of proposed GA-based FCL allocation and sizing method in terms of minimizing the cost of distribution protection system. The prices of \\{FCLs\\} are estimated using real market prices and simulations are performed in four cases assuming prices more than the estimated one, less than estimated price and equal to the real estimated cost for FCL. Numerical results show that FCL price highly affects the optimum choices for \\{FCLs\\} and the price imposed by using FCLs.

Sayyed Ali Akbar Shahriari; Ali Yazdian Varjani; Mahmood Reza Haghifam

2012-01-01T23:59:59.000Z

269

A Method to Optimize Ship Maneuvers for the Coordination of Hardkill and Softkill Weapons within a Frigate  

E-Print Network [OSTI]

A Method to Optimize Ship Maneuvers for the Coordination of Hardkill and Softkill Weapons within hardkill and softkill weapon systems is an important aspect of command and control for a Frigate. Since the effectiveness of a particular weapon varies depending on the orientation of the Frigate with respect

Kropf, Peter

270

NEW METHOD AND SOFTWARE FOR MULTI-VARIABLE TECHNO-ECONOMIC DESIGN OPTIMIZATION OF CSP PLANTS  

E-Print Network [OSTI]

for design optimization of solar thermal power plants. Thereby, optimization potential can be discovered to a 50 MWel parabolic trough power plant using thermal oil as heat transfer fluid (HTF), a molten salt, parabolic trough 1. Motivation (Introduction) Today, designs of solar thermal power plants are developed

Ábrahám, Erika

271

E-Print Network 3.0 - adaptive grid generation Sample Search...  

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

of .004, the adaptive algorithm automatically generates 5 refined grids. One grid patch... and more elsewhere, would clearly be optimal. In this talk, we describe a method of...

272

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

273

A novel method of hydrogen generation by water electrolysis using an ultra-short-pulse power supply  

Science Journals Connector (OSTI)

A novel method of hydrogen generation by water electrolysis using ultra-short-pulse power supply is ... pulse with the width of 300 ns, electrolysis takes place with a mechanism dominated by ... from the conventi...

Naohiro Shimizu; Souzaburo Hotta; Takayuki Sekiya…

2006-04-01T23:59:59.000Z

274

System and method for generating and/or screening potential metal-organic frameworks  

DOE Patents [OSTI]

A system and method for systematically generating potential metal-organic framework (MOFs) structures given an input library of building blocks is provided herein. One or more material properties of the potential MOFs are evaluated using computational simulations. A range of material properties (surface area, pore volume, pore size distribution, powder x-ray diffraction pattern, methane adsorption capability, and the like) can be estimated, and in doing so, illuminate unidentified structure-property relationships that may only have been recognized by taking a global view of MOF structures. In addition to identifying structure-property relationships, this systematic approach to identify the MOFs of interest is used to identify one or more MOFs that may be useful for high pressure methane storage.

Wilmer, Christopher E; Leaf, Michael; Snurr, Randall Q; Farha, Omar K; Hupp, Joseph T

2014-12-02T23:59:59.000Z

275

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

276

Optimized energy management for large organizations utilizing an on-site PHEV fleet, storage devices and renewable electricity generation  

Science Journals Connector (OSTI)

Note that this paper does not make decisions about when/how to use renewable generation. The scope of this study is to consider the power generated by renewable resources as a source of power with distinct cost o...

Yogesh Dashora; J. Wesley Barnes; Rekha S. Pillai; Todd Combs…

2012-06-01T23:59:59.000Z

277

Advanced Methods Approach to Hybrid Powertrain Systems Optimization of a Transit Bus Application  

Broader source: Energy.gov [DOE]

Design refinements of the GTB-40 mass-transit bus include new optimization processes, subsystem, and powertrain system requirements along with traction motor, battery, and APU development and integration

278

Conditional Nonlinear Optimal Perturbations: Adjoint-Free Calculation Method and Preliminary Test  

Science Journals Connector (OSTI)

An ensemble-based approach is proposed to obtain conditional nonlinear optimal perturbation (CNOP), which is a natural extension of linear singular vector to a nonlinear regime. The new approach avoids the use of adjoint technique during ...

Bin Wang; Xiaowei Tan

2010-04-01T23:59:59.000Z

279

Optimization of Mobile Phase Conditions for TLC Methods Used in Pharmaceutical Analyses  

Science Journals Connector (OSTI)

......point," describing a fixed set of chromatographic parameters. Three-point diagrams allow mobile phase optimization to pro ceed quickly, and they build on the typical characteristics of TLC. A wide range of conditions are easily covered with this technique......

Samuel J. Costanzo

1997-04-01T23:59:59.000Z

280

Simultaneous use of MRM (maximum rectangle method) and optimization methods in determining nominal capacity of gas engines in CCHP (combined cooling, heating and power) systems  

Science Journals Connector (OSTI)

Abstract Energy, economic, and environmental analyses of combined cooling, heating and power (CCHP) systems were performed here to select the nominal capacities of gas engines by combination of optimization algorithm and maximum rectangle method (MRM). The analysis was performed for both priority of providing electricity (PE) and priority of providing heat (PH) operation strategies. Four scenarios (SELL-PE, SELL-PH, No SELL-PE, No SELL-PH) were followed to specify design parameters such as the number and nominal power of prime movers, heating capacities of both backup boiler and energy storage tank, and the cooling capacities of electrical and absorption chillers. By defining an objective function called the Relative Annual Benefit (RAB), Genetic Algorithm optimization method was used for finding the optimal values of design parameters. The optimization results indicated that two gas engines (with nominal powers of 3780 and 3930 kW) in SELL-PE scenario, two gas engines (with nominal powers of 5290 and 5300 kW) in SELL-PH scenario, one gas engine (with nominal power of 2440 kW) in No SELL-PE scenario provided the maximum value of the objective function. Furthermore in No SELL-PE scenario (which had the lowest RAB value in comparison with that for the above mentioned scenarios), thermal energy storage was not required. Due to very low value of RAB, any gas engine in No SELL-PH scenario was not recommended.

Sepehr Sanaye; Navid Khakpaay

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "generation optimization methods" 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

Higher-Order Methods for Determining Optimal Controls and Their Sensitivities  

E-Print Network [OSTI]

..................................................... 7 2. OPTIMAL CONTROL SOLUTION METHODOLOGY .................................. 9 2.1 Approximating the Hamilton-Jacobi-Bellman Equation ...................... 9 2.2 Extension to Terminally Constrained Problems.... The final time may or may not be specified, depending on the particular problem. 1.2 Two Point Boundary Value Problem The optimal control problem established in Section 1.1 is transformed into a TPBVP using the principles of variational calculus...

McCrate, Christopher M.

2010-07-14T23:59:59.000Z

282

Advanced Review Geometry optimization  

E-Print Network [OSTI]

Advanced Review Geometry optimization H. Bernhard Schlegel Geometry optimization is an important part of most quantum chemical calcu- lations. This article surveys methods for optimizing equilibrium geometries, lo- cating transition structures, and following reaction paths. The emphasis is on optimizations

Schlegel, H. Bernhard

283

System and method for investigating sub-surface features of a rock formation with acoustic sources generating coded signals  

DOE Patents [OSTI]

A system and a method for investigating rock formations includes generating, by a first acoustic source, a first acoustic signal comprising a first plurality of pulses, each pulse including a first modulated signal at a central frequency; and generating, by a second acoustic source, a second acoustic signal comprising a second plurality of pulses. A receiver arranged within the borehole receives a detected signal including a signal being generated by a non-linear mixing process from the first-and-second acoustic signal in a non-linear mixing zone within the intersection volume. The method also includes-processing the received signal to extract the signal generated by the non-linear mixing process over noise or over signals generated by a linear interaction process, or both.

Vu, Cung Khac; Nihei, Kurt; Johnson, Paul A; Guyer, Robert; Ten Cate, James A; Le Bas, Pierre-Yves; Larmat, Carene S

2014-12-30T23:59:59.000Z

284

Extending a CAD-Based Cartesian Mesh Generator for the Lattice Boltzmann Method  

SciTech Connect (OSTI)

This paper describes the development of a custom preprocessor for the PaRAllel Thermal Hydraulics simulations using Advanced Mesoscopic methods (PRATHAM) code based on an open-source mesh generator, CartGen [1]. PRATHAM is a three-dimensional (3D) lattice Boltzmann method (LBM) based parallel flow simulation software currently under development at the Oak Ridge National Laboratory. The LBM algorithm in PRATHAM requires a uniform, coordinate system-aligned, non-body-fitted structured mesh for its computational domain. CartGen [1], which is a GNU-licensed open source code, already comes with some of the above needed functionalities. However, it needs to be further extended to fully support the LBM specific preprocessing requirements. Therefore, CartGen is being modified to (i) be compiler independent while converting a neutral-format STL (Stereolithography) CAD geometry to a uniform structured Cartesian mesh, (ii) provide a mechanism for PRATHAM to import the mesh and identify the fluid/solid domains, and (iii) provide a mechanism to visually identify and tag the domain boundaries on which to apply different boundary conditions.

Cantrell, J Nathan [ORNL] [ORNL; Inclan, Eric J [ORNL] [ORNL; Joshi, Abhijit S [ORNL] [ORNL; Popov, Emilian L [ORNL] [ORNL; Jain, Prashant K [ORNL] [ORNL

2012-01-01T23:59:59.000Z

285

Optimized Energy Management for Large Organizations Utilizing an On-Site PHEV fleet, Storage Devices and Renewable Electricity Generation  

SciTech Connect (OSTI)

Abstract This paper focuses on the daily electricity management problem for organizations with a large number of employees working within a relatively small geographic location. The organization manages its electric grid including limited on-site energy generation facilities, energy storage facilities, and plug-in hybrid electric vehicle (PHEV) charging stations installed in the parking lots. A mixed integer linear program (MILP) is modeled and implemented to assist the organization in determining the temporal allocation of available resources that will minimize energy costs. We consider two cost compensation strategies for PHEV owners: (1) cost equivalent battery replacement reimbursement for utilizing vehicle to grid (V2G) services from PHEVs; (2) gasoline equivalent cost for undercharging of PHEV batteries. Our case study, based on the Oak Ridge National Laboratory (ORNL) campus, produced encouraging results and substantiates the importance of controlled PHEV fleet charging as opposed to uncontrolled charging methods. We further established the importance of realizing V2G capabilities provided by PHEVs in terms of significantly reducing energy costs for the organization.

Dashora, Yogesh [University of Texas, Austin; Barnes, J. Wesley [University of Texas, Austin; Pillai, Rekha S [ORNL; Combs, Todd E [ORNL; Hilliard, Michael R [ORNL

2012-01-01T23:59:59.000Z

286

Methods of calculating currents of induction, self-excited generators with two distributed windings  

Science Journals Connector (OSTI)

A simplified way of calculating the current frequency of induction self-excited generator with two distributed windings on the stator is suggested. It ... do not influence the current frequency of the generator; ...

S. I. Kitsis; D. N. Pautov

2009-04-01T23:59:59.000Z

287

Nuclear power can reduce emissions and maintain a strong economy: Rating Australia’s optimal future electricity-generation mix by technologies and policies  

Science Journals Connector (OSTI)

Abstract Legal barriers currently prohibit nuclear power for electricity generation in Australia. For this reason, published future electricity scenarios aimed at policy makers for this country have not seriously considered a full mix of energy options. Here we addressed this deficiency by comparing the life-cycle sustainability of published scenarios using multi-criteria decision-making analysis, and modeling the optimized future electricity mix using a genetic algorithm. The published ‘CSIRO e-future’ scenario under its default condition (excluding nuclear) has the largest aggregate negative environmental and economic outcomes (score = 4.51 out of 8), followed by the Australian Energy Market Operator’s 100% renewable energy scenario (4.16) and the Greenpeace scenario (3.97). The e-future projection with maximum nuclear-power penetration allowed yields the lowest negative impacts (1.46). After modeling possible future electricity mixes including or excluding nuclear power, the weighted criteria recommended an optimized scenario mix where nuclear power generated >40% of total electricity. The life-cycle greenhouse-gas emissions of the optimization scenarios including nuclear power were nuclear power is an effective and logical option for the environmental and economic sustainability of a future electricity network in Australia.

Sanghyun Hong; Corey J.A. Bradshaw; Barry W. Brook

2014-01-01T23:59:59.000Z

288

An analysis of pavement heat flux to optimize the1 water efficiency of a pavement-watering method2  

E-Print Network [OSTI]

An analysis of pavement heat flux to optimize the1 water efficiency of a pavement-watering method2 Martin HENDEL1,2,3* , Morgane COLOMBERT2 , Youssef DIAB2,4 , Laurent ROYON3 3 1 Paris City Hall, Water.hendel@paris.fr)8 9 Preprint version. Uploaded on May 12th , 2014.10 Abstract: Pavement-watering as a technique

Paris-Sud XI, Université de

289

System and method to improve the power output and longetivity of a radioisotope thermoelectric generator  

SciTech Connect (OSTI)

By using the helium generated by the alpha emissions of a thermoelectric generator during space travel for cooling, the thermal degradation of the thermoelectric generator can be slowed. Slowing degradation allows missions to be longer with little additional expense or payload.

Mowery, Jr., Alfred L. (Potomac, MD)

1993-01-01T23:59:59.000Z

290

System and method to improve the power output and longevity of a radioisotope thermoelectric generator  

SciTech Connect (OSTI)

By using the helium generated by the alpha emissions of a thermoelectric generator during space travel for cooling, the thermal degradation of the thermoelectric generator can be slowed. Slowing degradation allows missions to be longer with little additional expense or payload. 1 figures.

Mowery, A.L. Jr.

1993-09-21T23:59:59.000Z

291

System and method to improve the power output and longetivity of a radioisotope thermoelectric generator  

SciTech Connect (OSTI)

By using the helium generated by the alpha emissions of a thermoelectric generator during space travel for cooling the thermal degradation of the thermoelectric generator can be slowed. Slowing degradation allows missions to be longer with little additional expense or payload.

Mowery, A.L. Jr.

1992-12-31T23:59:59.000Z

292

A Method of Decreasing Power Output Fluctuation of Solar Chimney Power Generating Systems  

Science Journals Connector (OSTI)

Severe fluctuation of power output is a common problem in the various generating systems of renewable energies. The hybrid energy storage system with water and soil is adopted to decrease the fluctuation of solar chimney power generating systems in the ... Keywords: Solar chimney power generating system, power output fluctuation, hybrid energy storage layer, collector, chimney

Meng Fanlong; Ming Tingzhen; Pan Yuan

2011-01-01T23:59:59.000Z

293

A Weighted Residual Framework for Formulation and Analysis of Direct Transcription Methods for Optimal Control  

E-Print Network [OSTI]

. First condition in Eqn. (2.2) provides n number of equations which can theoretically solve for n number of unknown components of x . Next, we look at a constrained optimization problem in the form, min x J = (x) : Rn ! R; subject to (x) = 0 2 Rm... with inequality constraints as fol- lowing: min x J = (x) : Rn ! R; subject to (x) 0 2 Rm; m < n: (2.8) For this problem, we derive the conditions for optimality using slack variables and Lagrange multipliers. Slack variables are used to convert...

Singh, Baljeet

2012-02-14T23:59:59.000Z

294

Optimizing the start-up operations of combined cycle power plants using soft computing methods  

Science Journals Connector (OSTI)

......megawatts. Industrial turbines produce high-quality...recovered to improve the efficiency of power generation...steam and drive a steam turbine in a combined-cycle...either gas or steam turbine alone because it performs...generation by their high efficiency and possibility to operate......

Ilaria Bertini; Matteo De Felice; Alessandro Pannicelli; Stefano Pizzuti

2012-08-01T23:59:59.000Z

295

A NEW METHOD FOR PERCEPTUALLY OPTIMIZED VISUALIZATION OF TWO LAYERED FLOW FIELDS  

E-Print Network [OSTI]

:...........................................................................................16 2.2 Step 1: Generating a parameterization: ...........................................................17 2.3 Step 2: Developing a streaklet generation algorithm:......................................19 2 is present here to hide the page number. Nothing in white shows up when printed. #12;iii ACKNOWLEDGEMENTS I

New Hampshire, University of

296

Minimization of voltage deviation and power losses in power networks using Pareto optimization methods  

Science Journals Connector (OSTI)

Voltage regulation is an important task in electrical engineering for controlling node voltages in a power network. A widely used solution for the problem of voltage regulation is based on adjusting the taps in under load tap changers (ULTCs) power transformers ... Keywords: Multi-objective optimization, Power distribution network, Power losses, Under load tap changers, Voltage regulation

Francisco G. Montoya; Raúl Baños; Consolación Gil; Antonio Espín; Alfredo Alcayde; Julio Gómez

2010-08-01T23:59:59.000Z

297

A Multi-Objective Memetic Optimization Method for Power Network Cascading Failures Protection  

E-Print Network [OSTI]

-dominated sorting mechanism and the Lamarckian local search. The 380 kV Italian power transmission network is used than conventional EAs [15]. In this paper, we formulate the optimal transmission line switching problem for their management. In this paper, we address this latter problem by line switching and propose a multi

Paris-Sud XI, Université de

298

New method for evaluation of the matrix representation of the generators in the unitary-group approach  

Science Journals Connector (OSTI)

A new superposition method is presented for evaluating the matrix representation of the generators in the unitary-group approach. This superposition method is based on the Weyl graphical method for the calculation of matrix elements; the latter is an extension of Harter’s jawbone formula for the evaluation of the matrix elements of Ei,i-1 to the more general case Ei,j and can also deal with both fermion and boson.

Hai-Lun Lin and Yu-Fang Cao

1988-01-01T23:59:59.000Z

299

GaInAs/AlInAs quantum cascade laser design based on optimized second harmonic generation  

Science Journals Connector (OSTI)

In this work, we present an innovative procedure for the design and optimization of GaInAs/AlInAs quantum cascade laser (QCL) structures based on the use of the genetic algorithm. The purpose of the algorithm is to determine the set of design parameters that would enable the maximization of the second order nonlinear susceptibility, thus facilitating significant optical nonlinearities to take place. In our optimization model, we start from the existing design in which the active region consists of two coupled InGaAs quantum wells separated by an AlInAs barrier, and the active region levels form double resonant nonlinear cascades. Upon obtaining the optimized structure and evaluating its energies and wave functions, the output characteristics are calculated by applying the full self-consistent rate equation modeling of the electron transport in a periodic QCL structure. The results of the calculations predict a noticeable improvement of targeted properties of the optimized design, while at the same time the original design calculations show excellent agreement with experimental results. The described procedure is applicable to various active region designs and can be used for other wavelength ranges.

A Gaji?; J Radovanovi?; V Milanovi?; D Indjin; Z Ikoni?

2014-01-01T23:59:59.000Z

300

Methodology of risk analysis by Monte Carlo Method applied to power generation with renewable energy  

Science Journals Connector (OSTI)

Abstract This paper presents a methodology that uses the Monte Carlo Method (MCM) to estimate the behavior of economic parameters which may help decision, considering the risk in project sustainability. In order to show how this methodology can be used, a Grid-Connected Photovoltaic System (GCPVS) of 1.575 kWp, located on the roof top of the laboratory building of the Grupo de Estudos e Desenvolvimento de Alternativas Energéticas – GEDAE, at the Universidade Federal do Pará – UFPA, Belém – Pará – Brazil, and operating since December 2007, is analyzed. This system was chosen because it was the first GCPVS installed in the Brazilian Amazon Region, being the first risk evaluation on using a renewable energy source connected to the grid in the Region. This work also presents a similar treatment for the case of a stand-alone photovoltaic system (SAPVS) installed in the remote Santo Antônio Village, municipality of Breves, Pará, Brazil, considering the risk of investment assumed by an investor in power generation projects with similar characteristics or using other renewable energy sources. The last case allows a better assessment for other important applications of renewable energy in the Amazon Region, where the demand for energy is growing, but is still costly and often not a priority in government actions.

Edinaldo José da Silva Pereira; João Tavares Pinho; Marcos André Barros Galhardo; Wilson Negrão Macêdo

2014-01-01T23:59:59.000Z

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


301

Analysis and optimization of the Graz cycle : a coal fired power generation scheme with near-zero carbon dioxide emissions  

E-Print Network [OSTI]

Humans are releasing record amounts of carbon dioxide into the atmosphere through the combustion of fossil fuels in power generation plants. With mounting evidence that this carbon dioxide is a leading cause of global ...

Alexander, Brentan R

2007-01-01T23:59:59.000Z

302

Optimization Online - Multistage Adaptive Robust Optimization for ...  

E-Print Network [OSTI]

Sep 5, 2014 ... ... with the increasing penetration of wind and solar power generation has ... Keywords: Electric energy systems, multistage robust optimization, ... Multistage Adaptive Robust Optimization for the Unit Commitment Problem.

Alvaro Lorca

2014-09-05T23:59:59.000Z

303

NOVEL THROUGH-SUBSTRATE CHARGING METHOD FOR ELECTRET GENERATOR USING SOFT X-RAY IRRADIATION  

E-Print Network [OSTI]

network node [1,2]. Especially, power generation from human motion [3] is one of the key technologies much attention from the perspective of its application to low-power electronic devices such as sensor for future green mobile electronics. Electret power generator is suitable for converting low

Kasagi, Nobuhide

304

Original article: An automatic unstructured grid generation method for viscous flow simulations  

Science Journals Connector (OSTI)

High aspect-ratio grids are required for accurate solution of boundary layer and wake flow. An approach for the efficient generation of isotropic and stretched viscous unstructured grids is introduced in this paper. The proposed grid generation algorithm ... Keywords: Stretched cells, Unstructured grid, Viscous layers

Seyed Saied Bahrainian; Zahra Mehrdoost

2012-09-01T23:59:59.000Z

305

Optimization Online - A derivative-free trust-funnel method for ...  

E-Print Network [OSTI]

Feb 27, 2014 ... Abstract: In this work, we look into new derivative-free methods to solve equality-

Phillipe Sampaio

2014-02-27T23:59:59.000Z

306

Economic and environmental analysis of power generation expansion in Japan considering Fukushima nuclear accident using a multi-objective optimization model  

Science Journals Connector (OSTI)

Nuclear power has long been a cornerstone of energy policy in Japan, a country with few natural resources of its own. However, following on from the Fukushima Daiichi accident, the Japanese government is now in the throes of reviewing its nuclear power policy. On the other hand, under continuing policies of greenhouse gas reduction, it is crucial to consider scenarios for the country to realize an economic, safe and low-carbon power generation system in the future. Therefore, in the present study, economic and environmental analysis was conducted on the power generation system in Japan up to 2030 using a multi-objective optimization methodology. Four nuclear power scenarios were proposed in light of the nuclear accident: (1) actively anti-nuclear; (2) passively negative towards nuclear; (3) conservative towards nuclear; and (4) active expansion of nuclear power. The obtained capacity mix, generation mix, generation cost, CO2 emissions and fuel consumption of the scenarios were compared and analysed. The obtained results show that the large scale penetration of PV (photovoltaic), wind and LNG (Liquefied Natural Gas) power can partly replace nuclear power, however, removing nuclear power entirely was not suggested from economic, environmental and energy security perspectives.

Qi Zhang; Benjamin C. Mclellan; Tetsuo Tezuka; Keiichi N. Ishihara

2012-01-01T23:59:59.000Z

307

Design, Analysis, and Optimization of a Radioisotope Thermophotovoltaic (RTPV) Generator, and its Applicability to an Illustrative Space Mission  

SciTech Connect (OSTI)

Paper presented at the 45th Congress of the IAF in Jerusalem, Israel, October 1994. The paper describes the results of a DOE-sponsored design study of a radioisotope thermophotovoltaic generator (RTPV), to complement similar studies of Radioisotope Thermoelectric Generators (RTGs) and Stirling Generators (RSGs) previously published by the authors. To focus the design effort, it was decided to direct it at a specific illustrative space mission, Pluto Fast Flyby (PFF). That mission, under study by the JPL, envisages a direct eight to nine-year flight to Pluto (the only unexplored planet in the solar system), followed by comprehensive mapping, surface composition, and atmospheric structure measurements during a brief flyby of the planet and its moon Charon, and transmission of the recorded science data to Earth during a six-week post-encounter cruise.

Schock, Alfred; Mukunda, Meera; Or, Chuen T; Kumar, Vasanth; Summers, G.

1994-10-01T23:59:59.000Z

308

Device and method for generating a beam of acoustic energy from a borehole, and applications thereof  

DOE Patents [OSTI]

In some aspects of the invention, a device, positioned within a well bore, configured to generate and direct an acoustic beam into a rock formation around a borehole is disclosed. The device comprises a source configured to generate a first signal at a first frequency and a second signal at a second frequency; a transducer configured to receive the generated first and the second signals and produce acoustic waves at the first frequency and the second frequency; and a non-linear material, coupled to the transducer, configured to generate a collimated beam with a frequency equal to the difference between the first frequency and the second frequency by a non-linear mixing process, wherein the non-linear material includes one or more of a mixture of liquids, a solid, a granular material, embedded microspheres, or an emulsion.

Vu, Cung Khac (Houston, TX); Sinha, Dipen N. (Los Alamos, NM); Pantea, Cristian (Los Alamos, NM); Nihei, Kurt (Oakland, CA); Schmitt, Denis P. (Katy, TX); Skelt, Christopher (Houston, TX)

2010-11-23T23:59:59.000Z

309

A LINEARIZATION METHOD FOR A UWB VCO-BASED CHIRP GENERATOR USING DUAL COMPENSATION  

E-Print Network [OSTI]

Ultra-Wideband (UWB) chirp generators are used on Frequency Modulated Continuous Wave (FMCW) radar systems for high-resolution and high-accuracy range measurements. At the Center for Remote Sensing of Ice Sheets (CReSIS), ...

Gomez-Garcia Alvestegui, Daniel

2011-12-31T23:59:59.000Z

310

Optimization Online Digest -- January 2005  

E-Print Network [OSTI]

Alexander Shapiro, Huifu Xu. Convex and Nonsmooth Optimization On the Minimum ... C. Jansson, C. Keil. Nonlinear Optimization A generating set search ...

311

Building America Top Innovations Hall of Fame Profile … Building Energy Optimization Analysis Method (BEopt)  

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

House geometries are among the many House geometries are among the many options users can enter in BEopt. Results shown here are rendered in SketchUp and show neighboring houses for shading analysis. To achieve Building America's ambitious energy-efficiency goals, it becomes increasingly important that researchers can identify the most cost-effective, high-performance improvements. BEopt has proven to be an invaluable analysis tool enabling Building America and its research partners to progress to zero net-energy new homes and deep energy retrofits. There are many energy analysis software tools out there-some do optimization, some do residential analysis, some do retrofit analysis, some come pre-packaged with options and costs, etc. With support from DOE's Building America program, researchers at the National Renewable Energy

312

Wind turbine generators having wind assisted cooling systems and cooling methods  

DOE Patents [OSTI]

A wind generator includes: a nacelle; a hub carried by the nacelle and including at least a pair of wind turbine blades; and an electricity producing generator including a stator and a rotor carried by the nacelle. The rotor is connected to the hub and rotatable in response to wind acting on the blades to rotate the rotor relative to the stator to generate electricity. A cooling system is carried by the nacelle and includes at least one ambient air inlet port opening through a surface of the nacelle downstream of the hub and blades, and a duct for flowing air from the inlet port in a generally upstream direction toward the hub and in cooling relation to the stator.

Bagepalli, Bharat (Niskayuna, NY); Barnes, Gary R. (Delanson, NY); Gadre, Aniruddha D. (Rexford, NY); Jansen, Patrick L. (Scotia, NY); Bouchard, Jr., Charles G. (Schenectady, NY); Jarczynski, Emil D. (Scotia, NY); Garg, Jivtesh (Cambridge, MA)

2008-09-23T23:59:59.000Z

313

System and method for determining an ammonia generation rate in a three-way catalyst  

SciTech Connect (OSTI)

A system according to the principles of the present disclosure includes a rate determination module, a storage level determination module, and an air/fuel ratio control module. The rate determination module determines an ammonia generation rate in a three-way catalyst based on a reaction efficiency and a reactant level. The storage level determination module determines an ammonia storage level in a selective catalytic reduction (SCR) catalyst positioned downstream from the three-way catalyst based on the ammonia generation rate. The air/fuel ratio control module controls an air/fuel ratio of an engine based on the ammonia storage level.

Sun, Min; Perry, Kevin L; Kim, Chang H

2014-12-30T23:59:59.000Z

314

Method for generating extreme ultraviolet with mather-type plasma accelerators for use in Extreme Ultraviolet Lithography  

DOE Patents [OSTI]

A device and method for generating extremely short-wave ultraviolet electromagnetic wave uses two intersecting plasma beams generated by two plasma accelerators. The intersection of the two plasma beams emits electromagnetic radiation and in particular radiation in the extreme ultraviolet wavelength. In the preferred orientation two axially aligned counter streaming plasmas collide to produce an intense source of electromagnetic radiation at the 13.5 nm wavelength. The Mather type plasma accelerators can utilize tin, or lithium covered electrodes. Tin, lithium or xenon can be used as the photon emitting gas source.

Hassanein, Ahmed (Bolingbrook, IL); Konkashbaev, Isak (Bolingbrook, IL)

2006-10-03T23:59:59.000Z

315

A hybrid method combining JFPSO and probabilistic three-phase load flow for improving unbalanced voltages in distribution systems with photovoltaic generators  

Science Journals Connector (OSTI)

This paper presents a new hybrid method that combines jumping frog and particle swarm optimization and probabilistic three-phase load flow to improve unbalanced voltages in distribution systems with photovoltaic

F. J. Ruiz-Rodriguez; F. Jurado; M. Gomez-Gonzalez

2014-09-01T23:59:59.000Z

316

Integrated method to create optimal dynamic strategic plans for corporate technology start-ups  

E-Print Network [OSTI]

This thesis presents an innovative method for evaluating and dynamically planning the development of uncertain technology investments. Its crux centers on a paradigm shift in the way managers assess investments, toward an ...

Mikati, Samir Omar

2009-01-01T23:59:59.000Z

317

Contribution of ion beam analysis methods to the development of 2nd generation high temperature superconducting (HTS) wires  

SciTech Connect (OSTI)

One of the crucial steps in the second generation high temperature superconducting wire program was development of the buffer layer architecture. The architecture designed at the Superconductivity Technology Center at Los Alamos National Laboratory consists of several oxide layers wherein each layer plays a specific role, namely: nucleation layer, diffusion barrier, biaxially textured template, and an intermediate layer with a good match to the lattice parameter of superconducting Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 7} (YBCO) compound. This report demonstrates how a wide range of ion beam analysis techniques (SIMS, RBS, channeling, PIXE, PIGE, NRA, ERD) was employed for analysis of each buffer layer and the YBCO films. These results assisted in understanding of a variety of physical processes occurring during the buffet layer fabrication and helped to optimize the buffer layer architecture as a whole.

Usov, Igor O [Los Alamos National Laboratory; Arendt, Paul N [Los Alamos National Laboratory; Stan, Liliana [Los Alamos National Laboratory; Holesinger, Terry G [Los Alamos National Laboratory; Foltyn, Steven R [Los Alamos National Laboratory; Depaula, Raymond F [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

318

Optimization of high-order harmonic generation by genetic algorithm and wavelet time-frequency analysis of quantum dipole emission  

E-Print Network [OSTI]

-order har- monic generation ~HHG! of orders as high as 300 has been observed @5,6#, with photon energies in excess of 500 eV. A novel concept of ‘‘intra-atomic’’ phase matching has been recently introduced, allowing the enhancement of the inten- sity of a..., as shown in Fig. 2, the major time domain contributing to the total har- monic intensity is the central part of the laser pulse with significant field intensity ~for example, between 24 to 14 optical cycles!. Beyond this central time regime, the har- monic...

Chu, Xi; Chu, Shih-I

2001-07-13T23:59:59.000Z

319

A manual procedure for assembly sequence planning based on the exploded view method  

E-Print Network [OSTI]

This thesis covers the development of a manual planning procedure based on the computerized method of exploded views to generate an optimal or near-optimal assembly sequence. Care has been taken to minimize iterative and tedious operations and make...

Rivero, Andres R

2012-06-07T23:59:59.000Z

320

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

Note: This page contains sample records for the topic "generation optimization methods" 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

Evaluation of Finite Element Method Based Software for Simulation of Hydropower Generator - Power Grid Interaction.  

E-Print Network [OSTI]

?? The accuracy, ease of use, and execution time of the finite element method based software Maxwell coupled to the system simulation software Simplorer was… (more)

Persarvet, Gustav

2011-01-01T23:59:59.000Z

322

Method, system and computer program product for monitoring and optimizing fluid extraction from geologic strata  

DOE Patents [OSTI]

An arrangement which utilizes an inexpensive flap valve/flow transducer combination and a simple local supervisory control system to monitor and/or control the operation of a positive displacement pump used to extract petroleum from geologic strata. The local supervisory control system controls the operation of an electric motor which drives a reciprocating positive displacement pump so as to maximize the volume of petroleum extracted from the well per pump stroke while minimizing electricity usage and pump-off situations. By reducing the electrical demand and pump-off (i.e., "pounding" or "fluid pound") occurrences, operating and maintenance costs should be reduced sufficiently to allow petroleum recovery from marginally productive petroleum fields. The local supervisory control system includes one or more applications to at least collect flow signal data generated during operation of the positive displacement pump. No flow, low flow and flow duration are easily evaluated using the flap valve/flow transducer arrangement.

Medizade, Masoud (San Luis Obispo, CA); Ridgely, John Robert (Los Osos, CA)

2009-12-15T23:59:59.000Z

323

System and method for generating steady state confining current for a toroidal plasma fusion reactor  

DOE Patents [OSTI]

A system for generating steady state confining current for a toroidal plasma fusion reactor providing steady-state generation of the thermonuclear power. A dense, hot toroidal plasma is initially prepared with a confining magnetic field with toroidal and poloidal components. Continuous wave RF energy is injected into said plasma to establish a spectrum of traveling waves in the plasma, where the traveling waves have momentum components substantially either all parallel, or all anti-parallel to the confining magnetic field. The injected RF energy is phased to couple to said traveling waves with both a phase velocity component and a wave momentum component in the direction of the plasma traveling wave components. The injected RF energy has a predetermined spectrum selected so that said traveling waves couple to plasma electrons having velocities in a predetermined range .DELTA.. The velocities in the range are substantially greater than the thermal electron velocity of the plasma. In addition, the range is sufficiently broad to produce a raised plateau having width .DELTA. in the plasma electron velocity distribution so that the plateau electrons provide steady-state current to generate a poloidal magnetic field component sufficient for confining the plasma. In steady state operation of the fusion reactor, the fusion power density in the plasma exceeds the power dissipated in the plasma.

Fisch, Nathaniel J. (Cambridge, MA)

1981-01-01T23:59:59.000Z

324

System and method for generating steady state confining current for a toroidal plasma fusion reactor  

DOE Patents [OSTI]

A system for generating steady state confining current for a toroidal plasma fusion reactor providing steady-state generation of the thermonuclear power. A dense, hot toroidal plasma is initially prepared with a confining magnetic field with toroidal and poloidal components. Continuous wave RF energy is injected into said plasma to estalish a spectrum of traveling waves in the plasma, where the traveling waves have momentum components substantially either all parallel, or all anti-parallel to the confining magnetic field. The injected RF energy is phased to couple to said traveling waves with both a phase velocity component and a wave momentum component in the direction of the plasma traveling wave components. The injected RF energy has a predetermined spectrum selected so that said traveling waves couple to plasma electrons having velocities in a predetermined range .DELTA.. The velocities in the range are substantially greater than the thermal electron velocity of the plasma. In addition, the range is sufficiently broad to produce a raised plateau having width .DELTA. in the plasma electron velocity distribution so that the plateau electrons provide steady-state current to generate a poloidal magnetic field component sufficient for confining the plasma. In steady state operation of the fusion reactor, the fusion power density in the plasma exceeds the power dissipated inthe plasma.

Bers, Abraham (Arlington, MA)

1981-01-01T23:59:59.000Z

325

Optimizing Motion Estimation with Linear Programming and Detail-Preserving Variational Method  

E-Print Network [OSTI]

-preserving variational method to upgrade the result into a dense motion field. The proposed scheme is much faster thanD scene reconstruction. Optical flow based meth- ods have been intensively studied for the small scale mo- tion estimation problem, e.g. the motion analysis of succes- sive frames in a high frame

Drew, Mark S.

326

Method of optimizing performance of Rankine cycle power plants. [US DOE Patent  

DOE Patents [OSTI]

A method is described for efficiently operating a Rankine cycle power plant to maximize fuel utilization efficiency or energy conversion efficiency or minimize costs by selecting a turbine fluid inlet state which is substantially on the area adjacent and including the transposed critical temperature line.

Pope, W.L.; Pines, H.S.; Doyle, P.A.; Silvester, L.F.

1980-06-23T23:59:59.000Z

327

Acoustic method for measurements of the coolant boiling on heat generating surfaces  

Science Journals Connector (OSTI)

Acoustic method for determining the period of different duties of the coolant boiling is presented. The foundation of this method is the damping phenomenon of ultrasonic waves travelling through the boundary between different media (steam–liquid) differing widely in their acoustic properties. The experimental setup and the results of the investigations into the period of water film boiling on spherical samples are also presented. The emphasis is on aluminum and copper samples differing in their diameter (4 5 and 8 mm) for temperature interval ?t=180–690°C at atmospheric pressure and different surrounding water temperatures (?t=15–75°C). By analyzing the result it is illustrated that the precision of the method is well above that of thermocouples. It is demonstrated that the measurements using this acoustic method excludes the errors typical of traditional methods. ?

2001-01-01T23:59:59.000Z

328

An optimization technique on pseudorandom generators based on chaotic iterations Jacques M. Bahi, Xiaole Fang, and Christophe Guyeux*  

E-Print Network [OSTI]

-Comt´e, Besanc¸on, France Email:{jacques.bahi, xiaole.fang, christophe.guyeux}@univ-fcomte.fr Abstract--Internet in the previous International Conference on Evolving Internet (Internet 09, 10, and 11), three methods to build tests decrease when the power of chaotic iterations increase. Keywords-Internet security; Pseudorandom

Boyer, Edmond

329

Integrating fuzzy AHP with TOPSIS method for optimal power substation location selection  

Science Journals Connector (OSTI)

Electromagnetic radiations emanating from the high voltage lines and substations pose serious adverse health consequences to living beings. As a result, evaluation and selection of power substation location is an important strategic decision making problem for both public and private sector. In this paper, fuzzy analytic hierarchy process (FAHP) has been integrated with technique for order preference by similarity to an ideal solution (TOPSIS) method to develop an improved and more appropriate power substation location evaluation and selection model considering social, technological, economical, environmental and site characteristics factors and sub criteria. The proposed decision-making approach takes advantage of the synergy between these two well-known multi-criteria analysis (MCA) methods. A numerical example is presented to show applicability and performance of the proposed methodology followed by a sensitivity analysis to discuss and explain the results.

Golam Kabir; M. Ahsan Akhtar Hasin

2013-01-01T23:59:59.000Z

330

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

331

Higher-Order Harmonic Generation from Fullerene by Means of the Plasma Harmonic Method  

SciTech Connect (OSTI)

We demonstrate, for the first time, high-order harmonic generation from C{sub 60} by an intense femtosecond Ti:sapphire laser. Laser-produced plasmas from C{sub 60}-rich epoxy and C{sub 60} films were used as the nonlinear media. Harmonics up to the 19th order were observed. The harmonic yield from fullerene-rich plasma is about 25 times larger compared with those produced from a bulk carbon target. Structural studies of plasma debris confirm the presence and integrity of fullerenes within the plasma plume, indicating fullerenes as the source of high-order harmonics.

Ganeev, R. A. [Institut National de la Recherche Scientifique, Energie, Materiaux et Telecommunications, 1650 Lionel-Boulet, Varennes, Quebec J3X 1S2 (Canada); Scientific Association Akadempribor, Academy of Sciences of Uzbekistan, Akademgorodok, Tashkent 100125 (Uzbekistan); Bom, L. B. Elouga; Abdul-Hadi, J.; Ozaki, T. [Institut National de la Recherche Scientifique, Energie, Materiaux et Telecommunications, 1650 Lionel-Boulet, Varennes, Quebec J3X 1S2 (Canada); Wong, M. C. H.; Brichta, J. P.; Bhardwaj, V. R. [Department of Physics, University of Ottawa, 150 Louis Pasteur, Ottawa, Ontario K1N 6N5 (Canada)

2009-01-09T23:59:59.000Z

332

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

333

Apparatus and method for characterizing thin film and interfaces using an optical heat generator and detector  

DOE Patents [OSTI]

An optical heat generation and detection system generates a first non-destructive pulsed beam of electromagnetic radiation that is directed upon a sample containing at least one interface between similar or dissimilar materials. The first pulsed beam of electromagnetic radiation, a pump beam (21a), produces a non-uniform temperature change within the sample. A second non-destructive pulsed beam of electromagnetic radiation, a probe beam (21b), is also directed upon the sample. Physical and chemical properties of the materials, and of the interface, are measured by observing changes in a transient optical response of the sample to the probe beam, as revealed by a time dependence of changes in, by example, beam intensity, direction, or state of polarization. The system has increased sensitivity to interfacial properties including defects, contaminants, chemical reactions and delaminations, as compared to conventional non-destructive, non-contact techniques. One feature of this invention is a determination of a Kapitza resistance at the interface, and the correlation of the determined Kapitza resistance with a characteristic of the interface, such as roughness, delamination, the presence of contaminants, etc.

Maris, Humphrey J (Barrington, RI); Stoner, Robert J (Duxbury, MA)

1998-01-01T23:59:59.000Z

334

Apparatus and method for characterizing thin film and interfaces using an optical heat generator and detector  

DOE Patents [OSTI]

An optical heat generation and detection system generates a first non-destructive pulsed beam of electromagnetic radiation that is directed upon a sample containing at least one interface between similar or dissimilar materials. The first pulsed beam of electromagnetic radiation, a pump beam, produces a non-uniform temperature change within the sample. A second non-destructive pulsed beam of electromagnetic radiation, a probe beam, is also directed upon the sample. Physical and chemical properties of the materials, and of the interface, are measured by observing changes in a transient optical response of the sample to the probe beam, as revealed by a time dependence of changes in, by example, beam intensity, direction, or state of polarization. The system has increased sensitivity to interfacial properties including defects, contaminants, chemical reactions and delaminations, as compared to conventional non-destructive, non-contact techniques. One feature of this invention is a determination of a Kapitza resistance at the interface, and the correlation of the determined Kapitza resistance with a characteristic of the interface, such as roughness, delamination, the presence of contaminants, etc. 31 figs.

Maris, H.J.; Stoner, R.J.

1998-05-05T23:59:59.000Z

335

Method and system for generating a beam of acoustic energy from a borehole, and applications thereof  

DOE Patents [OSTI]

A compact array of transducers is employed as a downhole instrument for acoustic investigation of the surrounding rock formation. The array is operable to generate simultaneously a first acoustic beam signal at a first frequency and a second acoustic beam signal at a second frequency different than the first frequency. These two signals can be oriented through an azimuthal rotation of the array and an inclination rotation using control of the relative phases of the signals from the transmitter elements or electromechanical linkage. Due to the non-linearity of the formation, the first and the second acoustic beam signal mix into the rock formation where they combine into a collimated third signal that propagates in the formation along the same direction than the first and second signals and has a frequency equal to the difference of the first and the second acoustic signals. The third signal is received either within the same borehole, after reflection, or another borehole, after transmission, and analyzed to determine information about rock formation. Recording of the third signal generated along several azimuthal and inclination directions also provides 3D images of the formation, information about 3D distribution of rock formation and fluid properties and an indication of the dynamic acoustic non-linearity of the formation.

Johnson Paul A. (Santa Fe, NM); Ten Cate, James A. (Los Alamos, NM); Guyer, Robert (Reno, NV); Le Bas, Pierre-Yves (Los Alamos, NM); Vu, Cung (Houston, TX); Nihei, Kurt (Oakland, CA); Schmitt, Denis P. (Katy, TX); Skelt, Christopher (Houston, TX)

2012-02-14T23:59:59.000Z

336

Methods and analysis of factors impact on the efficiency of the photovoltaic generation  

Science Journals Connector (OSTI)

First of all, the thesis elaborates two important breakthroughs which happened In the field of the application of solar energy in the 1950s.The 21st century the development of solar photovoltaic power generation will have the following characteristics: the continued high growth of industrial development, the significantly reducing cost of the solar cell, the large-scale high-tech development of photovoltaic industries, the breakthroughs of the film battery technology, the rapid development of solar PV buildings integration and combined to the grids. The paper makes principles of solar cells the theoretical analysis. On the basis, we study the conversion efficiency of solar cells, find the factors impact on the efficiency of the photovoltaic generation, solve solar cell conversion efficiency of technical problems through the development of new technology, and open up new ways to improve the solar cell conversion efficiency. Finally, the paper connecting with the practice establishes policies and legislation to the use of encourage renewable energy, development strategy, basic applied research etc.

Li Tianze; Zhang Xia; Jiang Chuan; Hou Luan

2011-01-01T23:59:59.000Z

337

Method and apparatus for generating motor current spectra to enhance motor system fault detection  

DOE Patents [OSTI]

A method and circuitry are disclosed for sampling periodic amplitude modulations in a nonstationary periodic carrier wave to determine frequencies in the amplitude modulations. The method and circuit are described in terms of an improved motor current signature analysis. The method insures that the sampled data set contains an exact whole number of carrier wave cycles by defining the rate at which samples of motor current data are collected. The circuitry insures that a sampled data set containing stationary carrier waves is recreated from the analog motor current signal containing nonstationary carrier waves by conditioning the actual sampling rate to adjust with the frequency variations in the carrier wave. After the sampled data is transformed to the frequency domain via the Discrete Fourier Transform, the frequency distribution in the discrete spectra of those components due to the carrier wave and its harmonics will be minimized so that signals of interest are more easily analyzed. 29 figs.

Linehan, D.J.; Bunch, S.L.; Lyster, C.T.

1995-10-24T23:59:59.000Z

338

Method and apparatus for generating motor current spectra to enhance motor system fault detection  

DOE Patents [OSTI]

A method and circuitry for sampling periodic amplitude modulations in a nonstationary periodic carrier wave to determine frequencies in the amplitude modulations. The method and circuit are described in terms of an improved motor current signature analysis. The method insures that the sampled data set contains an exact whole number of carrier wave cycles by defining the rate at which samples of motor current data are collected. The circuitry insures that a sampled data set containing stationary carrier waves is recreated from the analog motor current signal containing nonstationary carrier waves by conditioning the actual sampling rate to adjust with the frequency variations in the carrier wave. After the sampled data is transformed to the frequency domain via the Discrete Fourier Transform, the frequency distribution in the discrete spectra of those components due to the carrier wave and its harmonics will be minimized so that signals of interest are more easily analyzed.

Linehan, Daniel J. (Knoxville, TN); Bunch, Stanley L. (Oak Ridge, TN); Lyster, Carl T. (Knoxville, TN)

1995-01-01T23:59:59.000Z

339

Web-Based Method to Generate Specific Energy Consumption Data for the Evaluation and Optimization of Building Operation  

E-Print Network [OSTI]

5 University Karlsruhe (TH) - Department of Architecture Building Physics and Technical Building Services 0100200300400500600700800 ABCDEFGHI detailed analysis ACEGI benchmarkingand selection 0100200300400500600700800 12345678910 optimisation... consumption of electricity and heat arith. mean limit for heating energy demand: 95 kWh/m?y * for buildings with an average building compactness of 0,95 [building envelope/volume] * according to the German building code of 1995 University Karlsruhe (TH...

Wagner, A.; Wambsgan, M.; Froehlich, S.

2004-01-01T23:59:59.000Z

340

Method for the generation of variable density metal vapors which bypasses the liquidus phase  

DOE Patents [OSTI]

The present invention provides a method for producing a metal vapor that includes the steps of combining a metal and graphite in a vessel to form a mixture; heating the mixture to a first temperature in an argon gas atmosphere to form a metal carbide; maintaining the first temperature for a period of time; heating the metal carbide to a second temperature to form a metal vapor; withdrawing the metal vapor and the argon gas from the vessel; and separating the metal vapor from the argon gas. Metal vapors made using this method can be used to produce uniform powders of the metal oxide that have narrow size distribution and high purity.

Kunnmann, Walter (Stony Brook, NY); Larese, John Z. (Rocky Point, NY)

2001-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "generation optimization methods" 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

A new method for power generation and distribution in outer space  

SciTech Connect (OSTI)

The power system is a major component of a space system's size, mass, technical complexity, and hence, cost. To date, space systems include the energy source as an integral part of the mission satellite. Potentially significant benefit could be realized by separating the energy source from the end-use system and transmitting the power via an energy beam (power beaming) (Coomes et al., 1989). This concept parallels the terrestrial central generating station and transmission grid. In this summary, the system components required for power beaming implementation are outlined and applied to a satellite for power beaming implementation are outlined and applied to a satellite constellation to demonstrate the feasibility of implementing power beaming in the next 20 years. 5 refs., 1 fig., 3 tabs.

Bamberger, J.A.

1989-09-01T23:59:59.000Z

342

System and method for generating current by selective minority species heating  

DOE Patents [OSTI]

A system for the generation of toroidal current in a plasma which is prepared in a toroidal magnetic field. The system utilizes the injection of low-frequency waves into the plasma by means of phased antenna arrays or phased waveguide arrays. The plasma is prepared with a minority ion species of different charge state and different gyrofrequency from the majority ion species. The wave frequency and wave phasing are chosen such that the wave energy is absorbed preferentially by minority species ions traveling in one toroidal direction. The absorption of energy in this manner produces a toroidal electric current even when the injected waves themselves do not have substantial toroidal momentum. This current can be continuously maintained at modest cost in power and may be used to confine the plasma. The system can operate efficiently on fusion grade tokamak plasmas.

Fisch, Nathaniel J. (Princeton, NJ)

1983-01-01T23:59:59.000Z

343

An automatic method to generate force-field parameters for hetero-compounds  

Science Journals Connector (OSTI)

A method has been developed that automatically constructs a crystallographic refinement force field (topology and parameter files) for any molecule from a theoretical frequency calculation. The approach has been tested on five proteins containing metal sites or non-standard inhibitors or coenzymes and it is shown that the structures are improved in various aspects.

Nilsson, K.

2003-01-24T23:59:59.000Z

344

Directed evolution methods for improving polypeptide folding and solubility and superfolder fluorescent proteins generated thereby  

DOE Patents [OSTI]

The current invention provides methods of improving folding of polypeptides using a poorly folding domain as a component of a fusion protein comprising the poorly folding domain and a polypeptide of interest to be improved. The invention also provides novel green fluorescent proteins (GFPs) and red fluorescent proteins that have enhanced folding properties.

Waldo, Geoffrey S. (Santa Fe, NM)

2007-09-18T23:59:59.000Z

345

Connectivity-based, all-hexahedral mesh generation method and apparatus  

DOE Patents [OSTI]

The present invention is a computer-based method and apparatus for constructing all-hexahedral finite element meshes for finite element analysis. The present invention begins with a three-dimensional geometry and an all-quadrilateral surface mesh, then constructs hexahedral element connectivity from the outer boundary inward, and then resolves invalid connectivity. The result of the present invention is a complete representation of hex mesh connectivity only; actual mesh node locations are determined later. The basic method of the present invention comprises the step of forming hexahedral elements by making crossings of entities referred to as "whisker chords." This step, combined with a seaming operation in space, is shown to be sufficient for meshing simple block problems. Entities that appear when meshing more complex geometries, namely blind chords, merged sheets, and self-intersecting chords, are described. A method for detecting invalid connectivity in space, based on repeated edges, is also described, along with its application to various cases of invalid connectivity introduced and resolved by the method.

Tautges, Timothy James (Albuquerque, NM); Mitchell, Scott A. (Albuquerque, NM); Blacker, Ted D. (Green Oaks, IL); Murdoch, Peter (Salt Lake City, UT)

1998-01-01T23:59:59.000Z

346

A Zonotope-Based Method for Capturing the Effect of Variable Generation on the Power Flow  

E-Print Network [OSTI]

such as wind and solar into existing systems. Using this method, we can determine whether the system state- machine transmission system. I. INTRODUCTION The integration of renewable resources such as wind and solar of a power system; this uncertainty arises from the increasing penetration of renewable resources

Liberzon, Daniel

347

Apparatus and method for generating a magnetic field by rotation of a charge holding object  

DOE Patents [OSTI]

A device and a method for the production of a magnetic field using a Charge Holding Object that is mechanically rotated. In a preferred embodiment, a Charge Holding Object surrounding a sample rotates and subjects the sample to one or more magnetic fields. The one or more magnetic fields are used by NMR Electronics connected to an NMR Conductor positioned within the Charge Holding Object to perform NMR analysis of the sample.

Gerald, II, Rex E. (Brookfield, IL); Vukovic, Lela (Westchester, IL); Rathke, Jerome W. (Homer Glenn, IL)

2009-10-13T23:59:59.000Z

348

Electrochemical methods for generation of a biological proton motive force and pyridine nucleotide cofactor regeneration  

DOE Patents [OSTI]

Disclosed are methods using neutral red to mediate the interconversion of chemical and electrical energy. Electrically reduced neutral red has been found to promote cell growth and formation of reduced products by reversibly increasing the ratio of the reduced:oxidized forms of NAD(H) or NADP(H). Electrically reduced neutral red is able to serve as the sole source of reducing power for microbial cell growth. Neutral red is also able to promote conversion of chemical energy to electrical energy by facilitating the transfer of electrons from microbial reducing power to a fuel cell cathode.

Zeikus, Joseph G. (Okemas, MI); Park, Doo (Seoul, KR)

2001-01-01T23:59:59.000Z

349

Study on the method with associated particle for measuring the neutron yield of D–D neutron generator†  

Science Journals Connector (OSTI)

Abstract A measuring method with associated particles has been developed and tested to monitor the D–D neutron yield at a ZF-300 intense neutron generator in Lanzhou University. The experiment has been carried out in an environment of 236 keV and 0.5 mA of deuteron beam with a thick titanium-filmed target of molybdenum substrate at 135° for proton emission. All correction factors, including anisotropy factors and the yield ratio of neutron and proton, have been calculated, and the uncertainty of calculation result has been discussed.

Yan Yan; Xiaolong Lu; Zheng Wei; Siqi Yan; Changlin Lan; Junrun Wang; Jie Wang; Zeen Yao

2015-01-01T23:59:59.000Z

350

An elliptical tiling method to generate a 2-dimensional set of templates for gravitational wave search  

E-Print Network [OSTI]

Searching for a signal depending on unknown parameters in a noisy background with matched filtering techniques always requires an analysis of the data with several templates in parallel in order to ensure a proper match between the filter and the real waveform. The key feature of such an implementation is the design of the filter bank which must be small to limit the computational cost while keeping the detection efficiency as high as possible. This paper presents a geometrical method which allows one to cover the corresponding physical parameter space by a set of ellipses, each of them being associated to a given template. After the description of the main characteristics of the algorithm, the method is applied in the field of gravitational wave (GW) data analysis, for the search of damped sine signals. Such waveforms are expected to be produced during the de-excitation phase of black holes -- the so-called 'ringdown' signals -- and are also encountered in some numerically computed supernova signals.

Nicolas Arnaud; Matteo Barsuglia; Marie-Anne Bizouard; Violette Brisson; Fabien Cavalier; Michel Davier; Patrice Hello; Stephane Kreckelbergh; Edward K. Porter

2002-11-18T23:59:59.000Z

351

Method and apparatus for the simultaneous display and correlation of independently generated images  

DOE Patents [OSTI]

An apparatus and method for location by location correlation of multiple images from Non-Destructive Evaluation (NDE) and other sources. Multiple images of a material specimen are displayed on one or more monitors of an interactive graphics system. Specimen landmarks are located in each image and mapping functions from a reference image to each other image are calcuated using the landmark locations. A location selected by positioning a cursor in the reference image is mapped to the other images and location identifiers are simultaneously displayed in those images. Movement of the cursor in the reference image causes simultaneous movement of the location identifiers in the other images to positions corresponding to the location of the reference image cursor.

Vaitekunas, Jeffrey J. (Chicago, IL); Roberts, Ronald A. (Crown Point, IN)

1991-01-01T23:59:59.000Z

352

Generation of high charge state ions in vacuum arc ion sources by a ``current jump'' method  

SciTech Connect (OSTI)

In the investigation of ion charge state distributions (CSD) in vacuum arc plasmas, good correlation between increase in arc operating voltage and mean ion charge state has been established. Therefore, to increase the mean charge state of a vacuum arc plasma, it is necessary to find ways to increase the arc operating voltage. The voltage can be increased via transients associated with the arc current by means of which a rather high operation voltage can be established across the discharge gap. Experiments were performed both in Tomsk and Berkeley with the discharge system of a vacuum arc ion source. To effect a step current rise an additional power supply was connected to the usual vacuum arc supply. This power supply made it possible to increase the vacuum arc current up to 1 kA for several {micro}s. As a rule the current jump was produced after 100--200 {micro}s into the main discharge pulse when all principal parameters of the vacuum arc were already established. To measure the CSD a time-of-flight method was used. As followed from experiments, superposition of a short, high current pulse to the vacuum arc current pulse is accompanied by a jump in arc operation voltage. Subsequently during the current step the voltage falls exponentially to one hundred volts after the completion of the current jump, and the arc voltage takes its conventional value (20--40V). Because of this increase in arc operation voltage, an enhancement of high charge station ion fractions was observed. For example, with a Ti-cathode with conventional arc parameters there is only very small value to Ti{sup 4+} ion fraction in the vacuum arc plasma. Applying strong magnetic field increases the fraction of these ions up to 20% of the total beam current. The current jump enhanced this value up to 40%.

Bugaev, A.S.; Oks, E.M.; Yushkov, G.Y.; Brown, I.G.

1999-07-01T23:59:59.000Z

353

Cleanroom Energy Optimization Methods  

E-Print Network [OSTI]

in many parts of the country. The purpose of this article is to inform the reader. Whereas, the obvious benefits for energy conservation policies are mainly ecological; corporations with vision can implement policies that also contribute... significantly to the bottom line. Semiconductor Cleanroom Energy Based upon surveys the Semiconductor industry has over 12,800,000 ft2 (1,190,000 m2) of cleanroom space in the United States varying in cleanliness from Class M1 (ISO Class 3) to Class M6...

Naughton, P.; Schrecengost, R.

2004-01-01T23:59:59.000Z

354

Fast interpolation and time-optimization with contact  

Science Journals Connector (OSTI)

This paper presents a method for generating dynamically feasible, keyframe-interpolating motions for robots undergoing contact, such as in legged locomotion and manipulation. The first stage generates a twice-differentiable interpolating path that obeys ... Keywords: Trajectory optimization, algorithms, legged locomotion, manipulation

Kris Hauser

2014-08-01T23:59:59.000Z

355

Empirical comparison of robust, data driven and stochastic optimization  

E-Print Network [OSTI]

In this thesis, we compare computationally four methods for solving optimization problems under uncertainty: * Robust Optimization (RO) * Adaptive Robust Optimization (ARO) * Data Driven Optimization (DDO) * stochastic ...

Wang, Yanbo, S.M. Massachusetts Institute of Technology

2008-01-01T23:59:59.000Z

356

Methods for Analyzing the Benefits and Costs of Distributed Photovoltaic Generation to the U.S. Electric Utility System  

SciTech Connect (OSTI)

This report outlines the methods, data, and tools that could be used at different levels of sophistication and effort to estimate the benefits and costs of DGPV. In so doing, we identify the gaps in current benefit-cost-analysis methods, which we hope will inform the ongoing research agenda in this area. The focus of this report is primarily on benefits and costs from the utility or electricity generation system perspective. It is intended to provide useful background information to utility and regulatory decision makers and their staff, who are often being asked to use or evaluate estimates of the benefits and cost of DGPV in regulatory proceedings. Understanding the technical rigor of the range of methods and how they might need to evolve as DGPV becomes a more significant contributor of energy to the electricity system will help them be better consumers of this type of information. This report is also intended to provide information to utilities, policy makers, PV technology developers, and other stakeholders, which might help them maximize the benefits and minimize the costs of integrating DGPV into a changing electricity system.

Denholm, P.; Margolis, R.; Palmintier, B.; Barrows, C.; Ibanez, E.; Bird, L.; Zuboy, J.

2014-09-01T23:59:59.000Z

357

Apparatus and method for heterodyne-generated two-dimensional detector array using a single element detector  

DOE Patents [OSTI]

Apparatus and method for heterodyne-generated, two-dimensional detector array using a single detector. Synthetic-array heterodyne detection, permits a single-element optical detector to behave as though it were divided into an array of separate heterodyne detector elements. A fifteen-element synthetic array has successfully been experimentally realized on a single-element detector, permitting all of the array elements to be read out continuously and in parallel from one electrical connection. A CO.sub.2 laser and a single-element HgCdTe photodiode are employed. A different heterodyne local oscillator frequency is incident upon the spatially resolvable regions of the detector surface. Thus, different regions are mapped to different heterodyne beat frequencies. One can determine where the photons were incident on the detector surface even though a single electrical connection to the detector is used. This also prevents the destructive interference that occurs when multiple speckles are imaged (similar to spatial diversity), In coherent LIDAR this permits a larger field of view. An acoustooptic modulator generates the local oscillator frequencies and can achieve adequate spatial separation of optical frequencies of the order of a megahertz apart.

Strauss, Charlie E. (Santa Fe, NM)

1997-01-01T23:59:59.000Z

358

Apparatus and method for heterodyne-generated two-dimensional detector array using a single element detector  

DOE Patents [OSTI]

Apparatus and method are disclosed for heterodyne-generated, two-dimensional detector array using a single detector. Synthetic-array heterodyne detection, permits a single-element optical detector to behave as though it were divided into an array of separate heterodyne detector elements. A fifteen-element synthetic array has successfully been experimentally realized on a single-element detector, permitting all of the array elements to be read out continuously and in parallel from one electrical connection. A CO{sub 2} laser and a single-element HgCdTe photodiode are employed. A different heterodyne local oscillator frequency is incident upon the spatially resolvable regions of the detector surface. Thus, different regions are mapped to different heterodyne beat frequencies. One can determine where the photons were incident on the detector surface even though a single electrical connection to the detector is used. This also prevents the destructive interference that occurs when multiple speckles are imaged (similar to spatial diversity), In coherent LIDAR this permits a larger field of view. An acoustooptic modulator generates the local oscillator frequencies and can achieve adequate spatial separation of optical frequencies of the order of a megahertz apart. 4 figs.

Strauss, C.E.

1997-11-18T23:59:59.000Z

359

A fuzzy linear programming approach to the load shedding and generation reallocation problem  

Science Journals Connector (OSTI)

In this article, an effective method to control a power system during emergency conditions is presented. Based on Fuzzy Linear Programming (FLP), a new technique is developed to solve the Load Shedding and Generation Reallocation (LSGR) optimization ...

R. Hooshmand; V. Tahani; H. Seifi

1998-12-01T23:59:59.000Z

360

Optimization of the Cathode Catalyst Layer Composition of a PEM Fuel Cell Using a Novel 2-Step Preparation Method.  

E-Print Network [OSTI]

??For good performance and high durability PEM fuel cells run at high water saturation levels. However, excess liquid water generated by the oxygen reduction reaction… (more)

Friedmann, Roland

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "generation optimization methods" 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

Abstract--The optimal power flow (OPF) problem is a critical problem for power generation and is generally non-convex. This  

E-Print Network [OSTI]

voltage lines with voltage magnitudes below 100 kV. Traditionally OPF problem mainly focus on transmission generators to areas in need, the networks' voltages are typically above 100 kV. Distribution networks flow on the line P: vector of active power generations Q: vector of reactive power generations L: loss

Lavaei, Javad

362

Partially Adaptive Stochastic Optimization for Electric Power ...  

E-Print Network [OSTI]

Jan 3, 2015 ... Abstract: Electric Power Generation Expansion Planning (GEP) is the problem of determining an optimal construction and generation plan of ...

Jikai Zou

2015-01-03T23:59:59.000Z

363

An integrated energy–emergy approach to building form optimization: Use of EnergyPlus, emergy analysis and Taguchi-regression method  

Science Journals Connector (OSTI)

Abstract This research presents a new methodology of environmental building design with an integrated energy–emergy (spelled with an “m”) approach to study building form optimization in the schematic phases. In architecture, selection of sustainability assessment methods critically affects design goals, favoring or restricting choices designers can make. A building subsumes matter and energy to support human lives, but current building performance indicators are still hard to equate technical sides and human dominant sides of various scales in a synthetic metric. Moreover, in order to achieve global sustainability in a building, as a part of the whole built environment, it is necessary to integrate energy and environmental impacts at the highest scope of analysis. Emergy analysis coupled with building energy simulation can be suggested as a holistic indicator for architectural design process. To test the proposed method, a pilot study with a mid-size office building evaluates the consequences of early design decisions such as basic geometry, aspect ratio, window-wall ratio, construction types, etc. The integrated energy–emergy approach to building form optimization consists of three modules namely, Building Energy Simulation (BES) module, Building \\{EMergy\\} Analysis (BEMA) module, and (iii) MetaModel Development (MMD) module. The BES module uses the EnergyPlus tool for whole building energy analysis, while the BEMA module employs analytical methods to estimate emergy quantities, and the MMD module employs the Taguchi method to develop a metamodel for faster and easier whole building emergy simulation. The metamodel developed using Taguchi-ANOVA method for building form optimization was validated with analytical test results to accelerate environmental design decision-making. This study demonstrates possibility of wider applications of emergy synthesis to building energy research and facilitates practical use of emergy simulation in the environmental design process.

Hwang Yi; Ravi S. Srinivasan; William W. Braham

2015-01-01T23:59:59.000Z

364

Optimization Online - All Areas Submissions - October 2014  

E-Print Network [OSTI]

Gas Network Optimization: A comparison of Piecewise Linear Models CARLOS ... PSMG-A Parallel Structured Model Generator for Mathematical Programming

365

Optimization of the Cathode Catalyst Layer Composition of a PEM Fuel Cell Using a Novel 2-Step Preparation Method  

E-Print Network [OSTI]

For good performance and high durability PEM fuel cells run at high water saturation levels. However, excess liquid water generated by the oxygen reduction reaction at the cathode can block pores in the catalyst layer so ...

Friedmann, Roland

2009-03-05T23:59:59.000Z

366

Studies on Optimal Gas Supply For a Maskless Etching System with Micro- Discharge Plasma Operated at Atmospheric Pressure  

Science Journals Connector (OSTI)

An optimal gas supply method for the micro discharge plasma generated along a quartz glass electrode, which was useful for the maskless fabrication of electrode grooves for surface electrodes on solar cells, w...

Toshiyuki Hamada; Takuya Arimura; Tatsuya Sakoda

2012-04-01T23:59:59.000Z

367

Metallic cobalt and iron particles in large and medium pore zeolites. Methods of generation and ferromagnetic resonance characterization  

SciTech Connect (OSTI)

Spectroscopic studies utilizing photoacoustic electronic spectroscopy, electron paramagnetic resonance, and ferromagnetic resonance have been made on the formation of (1) Co metal particles from CO(NH/sub 3/)/sub 6//sup 3 +/ exchanged into Y zeolite and (2) Fe metal particles from nonframework Fe/sup 3 +/ ions in an aluminoferrisilicate analogue of ZSM-5 zeolite. Decomposition of the Co(NH/sub 3/)/sub 6//sup 3 +/ complex is accompanied by autoreduction to the Co/sup 2 +/ state, observed by EPR at 7/sup 0/K, but no Co metal is formed. The Co/sup 2 +/ ions migrate from the supercage locations of the parent complexes into the hexagonal prisms and are subsequently very difficult to reduce, even with H/sub 2/ at 823/sup 0/K. High-temperature FMR data suggest that the small amount of Co metal particles which are formed exist with the fcc crystal structure yielding g = 2.17 at 508/sup 0/K, consistent with an empirically calculated value for fcc Co. Hexagonal close packed Co particles are expected to exhibit much larger magnetic anisotropy than was observed. The Fe/sup 3 +/ ions in the medium pore pentasil aluminoferrisilicate zeolite can be reduced to the metallic state following either (a) precipitation of the inclusion compound, Fe/sup III/(Fe/sup II/(CN)/sub 5/(NO)), in the zeolite, or (b) generation of superparamagnetic oxidic ferric ion clusters. High-temperature FMR data establish that smaller Fe particles can be obtained by the latter method.

Iton, L.E.; Beal, R.B.; Hamot, P.J.

1983-01-01T23:59:59.000Z

368

Increasing the Sensitivity of an LC–MS Method for Screening Material Extracts for Organic Extractables via Mobile Phase Optimization  

Science Journals Connector (OSTI)

......that facilitate the production of excess negative charge...number of protons to hydrogen gas. These excess charges...Chromatography, Liquid methods Drug Packaging Hydrogen-Ion Concentration Mass Spectrometry methods Organic Chemicals analysis......

Yousheng Hua; Dennis Jenke

2012-03-01T23:59:59.000Z

369

Development and Testing of Manufacturing Methods for a Piezoelectric Composite Stacked Generator to Improve the Success Rate of Interbody Spinal Fusion  

E-Print Network [OSTI]

that will be submitted as a Technical Note to a peer-reviewed journal in the field of smart materials. It details the testing of two manufacturing methods of a piezoelectric composite stacked generator. The paper explains the testing regimen used to determine... connected in parallel. The electrical connection of the layers provides many challenges and is the location of the most common failures. Different manufacturing methods and materials must be tested in order to find ways that reduce failure of the stacked...

Tobaben, Eric

2014-08-31T23:59:59.000Z

370

Selection of optimal AR spectral estimation method for internal carotid arterial Doppler signals using Cramer-Rao bound  

Science Journals Connector (OSTI)

In this study, Doppler signals recorded from internal carotid artery of 80 subjects were processed by PC-computer using autoregressive method and Doppler power spectra were obtained. The parameters of autoregressive method were estimated by different ... Keywords: AR spectral estimation method, Cramer-Rao bound, Doppler signal, Internal carotid artery, Power spectral density

Elif Derya íbeyli; ?nan Güler

2004-10-01T23:59:59.000Z

371

The use of geothermal energy: A reliable, cheap, and environmentally friendly method for generating electricity and heat  

Science Journals Connector (OSTI)

The economical and environmental aspects of generating electricity at traditional thermal power stations and at geothermal power stations are considered. The dynamics of prices for fossil fuel and results from...

O. A. Povarov; O. M. Dubnov; A. I. Nikol’skii

2007-08-01T23:59:59.000Z

372

Optimization Online - Global Optimization Submissions - 2012  

E-Print Network [OSTI]

Proximal Point Method for Minimizing Quasiconvex Locally Lipschitz Functions ... Formulas for calculating the extremum ranks and inertias of a four-term quadratic ... Branch-and-Lift Algorithm for Deterministic Global Optimization in Nonlinear ...

373

Optimizing Treatment Performance of Microbial Fuel Cells by Reactor Staging  

Science Journals Connector (OSTI)

Optimizing Treatment Performance of Microbial Fuel Cells by Reactor Staging ... Multi-unit optimization is a recently proposed method that uses multiple similar units to optimize process performance. ...

Roberto P. Pinto; Boris Tartakovsky; Michel Perrier; Bala Srinivasan

2010-08-18T23:59:59.000Z

374

Method for generation of THz frequency radiation and sensing of large amplitude material strain waves in piezoelectric materials  

SciTech Connect (OSTI)

Strain waves of THz frequencies can coherently generate radiation when they propagate past an interface between materials with different piezoelectric coefficients. Such radiation is of detectable amplitude and contains sufficient information to determine the time-dependence of the strain wave with unprecedented subpicosecond, nearly atomic time and space resolution.

Reed, Evan J. (Pine Island, MN); Armstrong, Michael R. (Albuquerque, NM)

2010-09-07T23:59:59.000Z

375

Journal of Power Sources 126 (2004) 193202 Li-ion microbatteries generated by a laser direct-write method  

E-Print Network [OSTI]

to fabricate Li-ion microbatteries. The battery electrodes are made by the laser-induced forward transfer. Keywords: Microbattery; Battery; Li-ion; Direct-write; Laser 1. Introduction A current trend in technologyJournal of Power Sources 126 (2004) 193­202 Li-ion microbatteries generated by a laser direct

Arnold, Craig B.

376

Optimization Journals, Sites, Societies  

E-Print Network [OSTI]

Optimization Online Links. Optimization related societies. Mathematical Optimization Society · SIAM · INFORMS. Optimization related journals. Mathematical ...

377

Engineering Optimization Vol. 37, No. 5, July 2005, 463477  

E-Print Network [OSTI]

in radio-frequency (RF) plasma processing. *Corresponding author. Email: lars.nolle@ntu.ac.uk Engineering. In industrial plasmas, a RF generator is used as an external power-source, usually operating at 13.56 MHz investigation, a simulated annealing (SA) method was developed to optimize 14 Fourier terms in a radio-frequency

Hopgood, Adrian

378

Energy optimization system  

DOE Patents [OSTI]

A system for optimizing customer utility usage in a utility network of customer sites, each having one or more utility devices, where customer site is communicated between each of the customer sites and an optimization server having software for optimizing customer utility usage over one or more networks, including private and public networks. A customer site model for each of the customer sites is generated based upon the customer site information, and the customer utility usage is optimized based upon the customer site information and the customer site model. The optimization server can be hosted by an external source or within the customer site. In addition, the optimization processing can be partitioned between the customer site and an external source.

Zhou, Zhi; de Bedout, Juan Manuel; Kern, John Michael; Biyik, Emrah; Chandra, Ramu Sharat

2013-01-22T23:59:59.000Z

379

Concerted unimolecular triple dissociation of s-tetrazine: Transition-state structural optimizations using configuration interaction and coupled cluster methods  

SciTech Connect (OSTI)

High level ab initio quantum mechanical methods have been applied to the reaction s-tetrazine {yields} 2HCN + N{sub 2}. Basis sets as large as triple-{zeta} plus double polarization (TZ2P) were used in conjunction with configuration interaction and coupled cluster methods including in some cases all triple excitations (CCSDT-1). The result is an enormous decrease in the predicted triple dissociation barrier height from 79.4 kcal (double-{zeta} plus polarization basis set, self-consistent-field method) to the final barrier of 38.3 kcal. After correction for zero-point vibrational energies, the predicted activation energy is only 33.1 kcal. Since this prediction falls well below the threshold for photodissociation (51.8 kcal), new experiments are called for.

Scuseria, G.E. (Rice Univ., Houston, TX (USA)); Schaefer, H.F. III (Univ. of Georgia, Athens (USA))

1990-07-12T23:59:59.000Z

380

Participatory learning and knowledge assessment with a game-based method relying on student-generated questions  

E-Print Network [OSTI]

A game based on student-generated multiple-choice questions (MCQs) was used to promote participatory learning and as a knowledge assessment tool in the framework of an elementary course in Photonics. Under the instructor's guidance, students were asked to author MCQs, including both question stems and four possible answers (three distractors and one correct answer). They were told that good enough questions would enter a repository from which MCQs for the final exam could be drawn. The student-generated MCQs were then reviewed by the instructor, who discarded unsuitable questions and made amendments to ensure quality standards. The resulting repository (with the key to the correct answers) was made available to the students, whereupon a subset of questions were selected by the instructor to set the MCQ test for the final exam (consisting of a MCQ test based on student-generated questions and a problem-solving part set entirely by the instructor). The MCQ repository was large enough to ensure that rote learnin...

Abad, Enrique; Gil, Julia

2015-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "generation optimization methods" 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

Optimal Structural Nested Models for Optimal Sequential Decisions  

Science Journals Connector (OSTI)

I describe two new methods for estimating the optimal treatment regime (equivalently, protocol, plan or strategy) from very high dimesional observational and experimental data: (i) g-estimation of an optimal doub...

James M. Robins

2004-01-01T23:59:59.000Z

382

Characterization of optimal entanglement witnesses  

Science Journals Connector (OSTI)

In this paper, we present a characterization of optimal entanglement witnesses in terms of positive maps and then provide a general method of checking optimality of entanglement witnesses. Applying it, we obtain indecomposable optimal witnesses that have no spanning property. These also provide examples that support a recent conjecture saying that the so-called structural physical approximations to optimal positive maps (optimal entanglement witnesses) give entanglement breaking maps (separable states).

Xiaofei Qi and Jinchuan Hou

2012-02-27T23:59:59.000Z

383

Design-by-Analogy Using the WordTree Method and an Automated WordTree Generating Tool  

E-Print Network [OSTI]

-automated method, it did enable the process of identifying analogies to be done faster. Tools designed to perform tasks faster and more efficiently usually tend to have a positive effect on its users. Different ontologies were studied for their value...

Oriakhi, Edgar Velazquez

2012-07-16T23:59:59.000Z

384

On optimizing Jacobi–Davidson method for calculating eigenvalues in low dimensional structures using eight band k · p model  

SciTech Connect (OSTI)

The paper presents two ways of improving the Jacobi–Davidson method for calculating the eigenvalues and eigenvectors described by eight-band k · p model for quantum dots and other low dimensional structures. First, the method is extended by the application of time reversal symmetry operator. This extension allows efficient calculations of the twofold degeneracy present in the multiband k · p model and other interior eigenvalues. Second, the preconditioner for the indefinite matrix which comes from the discretization of the eight band k · p Hamiltonian is presented. The construction of this preconditioner is based on physical considerations about energy band structure in the k · p model. On the basis of two real examples, it is shown that the preconditioner can significantly shorten the time needed to calculate the interior eigenvalues, despite the fact that the memory usage of the preconditioner and Hamiltionian is comparable. Finally, some technical details for implementing the eight band k · p Hamiltonian and the eigensolver are provided.

Andrzejewski, Janusz, E-mail: Janusz.Andrzejewski@pwr.wroc.pl

2013-09-15T23:59:59.000Z

385

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

386

Verification, optimization and refinement of a direct-inverse transonic wing design method including weak viscous interaction  

E-Print Network [OSTI]

and Refinement of a. Direct-Inverse Transonic Wing Design Method Including Weak Viscous Interaction. (August 1989) Robert R. Ratcliff, B. S. , Texas A&M University Chair oi' Advisory Committee: Dr. Leland A. Carlson New developments in the direct-inverse wing... AND DISCUSSION . 92 VI V. 1 Bound&ary L&iyer and Wake Effects . . V. 2 Spanwise Grid Skewness V. 3 Wing Planform Effects V. 4 Initial Profile Efi'ects V. 5 Pressure Distribution Compatibility V. 6 Grid Refinement Effects . . V. 7 Fixed Trailing Edge...

Ratcliff, Robert R.

2012-06-07T23:59:59.000Z

387

Preparation of highly stable bimetallic Ni–Cu catalyst for simultaneous production of hydrogen and fish-bone carbon nanofibers: Optimization, effect of catalyst preparation methods and deactivation  

Science Journals Connector (OSTI)

Abstract This paper presents the preparation of highly stable nano-porous Ni–Cu catalysts for simultaneous production of COx–free hydrogen and carbon nano-fibers. The main features of this work focuses on the optimization, methods of catalyst preparation and application of an experimental model for deactivation. The fresh catalysts and the deposited carbon were characterized by SEM, TEM, XRD and Raman spectroscopy. Whatever to be the preparation methods, performance tests showed that the presence of Cu as promoter in Ni–Cu–MgO catalysts, enhanced the catalytic activity, substantially at higher temperatures with the best result obtained for Ni–Cu–MgO catalyst prepared by one step sol- gel method, reaching a hydrogen concentration of 70 vol% (160.51 mol H2/mol Ni-1 h) and a smaller value of ID/IG (less imperfection) for produced carbon nano-fibers at 670 °C. Detailed rate-based model for deactivation of catalyst was found to be dependent on the time, reaction temperature and partial pressure of methane and indicated that the reaction of deactivation could be modeled by a simple hyperbolic model.

Nosrat Izadi; Ali Morad Rashidi; Ahmad Zeraatkar; Heshmatollah Varmazyar; Maryam Rashtchi

2014-01-01T23:59:59.000Z

388

Fault-tolerant control for current sensors of doubly fed induction generators based on an improved fault detection method  

Science Journals Connector (OSTI)

Abstract Fault-tolerant control of current sensors is studied in this paper to improve the reliability of a doubly fed induction generator (DFIG). A fault-tolerant control system of current sensors is presented for the DFIG, which consists of a new current observer and an improved current sensor fault detection algorithm. The current observer is constructed by using only voltage signals as inputs. The fault detection algorithm is based on the current observer, in which an adaptive threshold and different fault duration times are considered. The performance of the proposed observer, improved fault detection algorithm, and fault-tolerant control system are investigated by simulation. The results indicate that the outputs of the observer and the sensor are highly coherent. The fault detection algorithm can efficiently detect both soft and hard faults in current sensors, and the fault-tolerant control system can effectively tolerate both types of faults.

H. Li; C. Yang; Y.G. Hu; B. Zhao; M. Zhao; Z. Chen

2014-01-01T23:59:59.000Z

389

A rough set-based effective rule generation method for classification with an application in intrusion detection  

Science Journals Connector (OSTI)

In this paper, we use Rough Set Theory (RST) to address the important problem of generating decision rules for data mining. In particular, we propose a rough set-based approach to mine rules from inconsistent data. It computes the lower and upper approximations for each concept, and then builds concise classification rules for each concept satisfying required classification accuracy. Estimating lower and upper approximations substantially reduces the computational complexity of the algorithm. We use UCI ML Repository data sets to test and validate the approach. We also use our approach on network intrusion data sets captured using our local network from network flows. The results show that our approach produces effective and minimal rules and provides satisfactory accuracy.

Prasanta Gogoi; Dhruba K. Bhattacharyya; Jugal K. Kalita

2013-01-01T23:59:59.000Z

390

Analysis of the breakthrough of diisocyanates from a generated aerosol using the Occupational Safety and Health Administration Method number 42  

E-Print Network [OSTI]

When sampling for isocyanates utilizing OSHA methodology, a glass fiber filter coated with I-(2-pyridyl)piperazine is used for collection. For OSHA Method 42 which is used for 2,6-toluene diisocyanate, 2,4-toluene diisocyanate, and 1,6-hexamethylene...

Player, Leah Montgomery

2012-06-07T23:59:59.000Z

391

Optimization Neuroimaging'',  

E-Print Network [OSTI]

Canonical Ridge Analysis with Ridge Parameter Optimization F. �. Nielsen, L. K. Hansen and S. C - PLS 1 = k 0 = k optimal k k = optimal k k £ £ 0 #12; Canonical Ridge Analysis with Ridge Parameter Optimization F. �. Nielsen, L. K. Hansen and S. C. Strother The Human Brain Project, P20 MH57180 ``Spatial

Nielsen, Finn Ã?rup

392

Factor exploration and multi-criteria assessment method (AHP) of multi-generational consumer in electronic commerce  

Science Journals Connector (OSTI)

In previous researches, many of the instruments to consumer decision making style were developed in the context of the consumer offline buying process. With the proliferation of the internet and World Wide Web applications, users are increasing interfacing and interacting with web-based applications and have already started purchasing electronically. It is, therefore, important to develop new or redefine previous instruments and scales, which are directly targeted to the consumer who buy electronically. This research is directed towards multi-generational consumers (n = 411) of India to understand the consumers' electronic decision making style instruments. The study empirically examines the influence of eight extracted factors by the authors and analytic hierarchy process (AHP) approach used for prioritisation. A hierarchical structure evaluation criteria model has been constructed, and the global priority weight of each criterion in the model has also been determined. The results of this research give a new insight to understand decision making instruments of consumers' electronic purchase and help the electronic service provider to better understand more influencing factors of the electronic consumer, which can help them to achieve a sustainable competitive advantage in global markets and a way of enhancing performance.

Anil Kumar; Manoj Kumar Dash

2014-01-01T23:59:59.000Z

393

Fuzzy logic control strategy of wind generator based on the dual-stator induction generator  

Science Journals Connector (OSTI)

Abstract The work presented in this paper is the evaluation of the variable speed wind turbine based on dual star induction generator (DSIG) connected for power optimization in the conversion chain connected to the electrical grid. This optimization is concretized by two methods, namely, the Maximum Power Point Tracking ‘MPPT’ algorithm in the case where the characteristic of the turbine is known and the nonlinear method based on the theory of fuzzy logic controlled torque which is most appropriate when there is a lack of information on the characteristic ( C p ( ? ) ) of the turbine. However, the limitation of power is performed by action on the generator control only. Simulation results are presented and discussed.

Samira Chekkal; Narimen Aouzellag Lahaçani; Djamal Aouzellag; Kaci Ghedamsi

2014-01-01T23:59:59.000Z

394

Method and apparatus for directing ions and other charged particles generated at near atmospheric pressures into a region under vacuum  

DOE Patents [OSTI]

A method and apparatus for focusing dispersed charged particles. More specifically, a series of elements within a region maintained at a pressure between 10.sup.-1 millibar and 1 bar, each having successively larger apertures forming an ion funnel, wherein RF voltages are applied to the elements so that the RF voltage on any element has phase, amplitude and frequency necessary to define a confinement zone for charged particles of appropriate charge and mass in the interior of the ion funnel, wherein the confinement zone has an acceptance region and an emmitance region and where the acceptance region area is larger than the emmitance region area.

Smith, Richard D. (Richland, WA); Shaffer, Scott A. (Seattle, WA)

2000-01-01T23:59:59.000Z

395

Design of a Power Oscillation Damper for DFIG-based Wind Energy Conversion System Using Modified Particle Swarm Optimizer  

Science Journals Connector (OSTI)

This paper presents a method to design a Power Oscillation Damper (POD) for Double-Fed Induction Generator (DFIG) based Wind Energy Conversion System (WECS), operating with voltage control loop. Based on eigen values information from Small Signal Stability ... Keywords: Computational Intelligence, double fed induction generator, power oscillation damper, modified particle swarm optimizer, small signal stability analysis, wind energy conversion system

Huazhang Huang; C. Y. Chung

2012-05-01T23:59:59.000Z

396

Polyethylene fiber drawing optimization  

E-Print Network [OSTI]

Polymer fiber drawing creates fibers with enhanced thermal conductivity and strength compared to bulk polymer because drawing aligns the molecular chains. I optimize the polymer fiber drawing method in order to achieve ...

Chiloyan, Vazrik

2011-01-01T23:59:59.000Z

397

4269.ps - Optimization Online  

E-Print Network [OSTI]

lem concerning the optimal design of an industrial electric motor. This allows to show that. the method ...... phase resistance at 90? [?]. ? 0.31. g8. torque at base

398

Convergence problem in forward/backward sweep power flow method caused by non-positive-sequence impedance of distributed generators and its solution  

Science Journals Connector (OSTI)

Abstract A variety of distributed generators (DGs) are integrated in distribution system which is usually operated under three-phase unbalanced conditions. The zero and negative sequence impedances of \\{DGs\\} may vary within a large range. In this paper, the convergence problem caused by the zero and negative sequence impedances of \\{DGs\\} in forward/backward sweep three-phase power flow is found through numerical experiments. The reason of this phenomenon is explained and an impedance compensation method is proposed to solve this problem.

Yuntao Ju; Wenchuan Wu; Boming Zhang

2014-01-01T23:59:59.000Z

399

Projection methods in conic optimization  

E-Print Network [OSTI]

supposed to be a correlation matrix but for a variety of reasons is not. For example ..... A simple Matlab implementation has been made publicly available together ..... the stable number ?(G) of a graph G and the chromatic number ?( ¯G

2011-03-08T23:59:59.000Z

400

Optimal Filtering, Methods AUTOMATIC CONTROL  

E-Print Network [OSTI]

SYSTEMS 7Updating Pi By use of the generalized Stoke's identity the update can be done as Ki+1 = Ki - FLiR

Gustafsson, Fredrik

Note: This page contains sample records for the topic "generation optimization methods" 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

Optimization methods for protein folding.  

E-Print Network [OSTI]

??Diese Diplomarbeit beschäftigt sich mit der mathematische Vorhersage von der tertiär Struktur Proteinen. Das Hauptteil ist eine Selbstversuch, Proteinstruktur mittels Optimierung zu vorhersagen. Nach einer… (more)

Burger, Virginia Margaret

2008-01-01T23:59:59.000Z

402

APPLICATION OF A DAMPED LOCALLY OPTIMIZED COMBINATION OF IMAGES METHOD TO THE SPECTRAL CHARACTERIZATION OF FAINT COMPANIONS USING AN INTEGRAL FIELD SPECTROGRAPH  

SciTech Connect (OSTI)

High-contrast imaging instruments are now being equipped with integral field spectrographs (IFSs) to facilitate the detection and characterization of faint substellar companions. Algorithms currently envisioned to handle IFS data, such as the Locally Optimized Combination of Images (LOCI) algorithm, rely on aggressive point-spread function (PSF) subtraction, which is ideal for initially identifying companions but results in significantly biased photometry and spectroscopy owing to unwanted mixing with residual starlight. This spectrophotometric issue is further complicated by the fact that algorithmic color response is a function of the companion's spectrum, making it difficult to calibrate the effects of the reduction without using iterations involving a series of injected synthetic companions. In this paper, we introduce a new PSF calibration method, which we call 'damped LOCI', that seeks to alleviate these concerns. By modifying the cost function that determines the weighting coefficients used to construct PSF reference images, and also forcing those coefficients to be positive, it is possible to extract companion spectra with a precision that is set by calibration of the instrument response and transmission of the atmosphere, and not by post-processing. We demonstrate the utility of this approach using on-sky data obtained with the Project 1640 IFS at Palomar. Damped LOCI does not require any iterations on the underlying spectral type of the companion, nor does it rely on priors involving the chromatic and statistical properties of speckles. It is a general technique that can readily be applied to other current and planned instruments that employ IFSs.

Pueyo, Laurent [Department of Physics and Astronomy, Johns Hopkins University, 366 Bloomberg Center, 3400 N. Charles Street, Baltimore, MD 21218 (United States); Crepp, Justin R.; Hinkley, Sasha; Hillenbrand, Lynne; Dekany, Richard; Bouchez, Antonin; Roberts, Jenny [California Institute of Technology, 1200 E. California Blvd., Pasadena, CA 91125 (United States); Vasisht, Gautam; Roberts, Lewis C.; Shao, Mike; Burruss, Rick [Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 (United States); Brenner, Douglas; Oppenheimer, Ben R.; Zimmerman, Neil [American Museum of Natural History, Central Park West at 79th Street, New York, NY 10024 (United States); Parry, Ian [Institute of Astronomy, University of Cambridge, Madingley Rd., Cambridge, CB3 0HA (United Kingdom); Beichman, Charles [NASA Exoplanet Science Institute, 770 S. Wilson Avenue, Pasadena, CA 91225 (United States); Soummer, Remi, E-mail: lap@pha.jhu.edu [Space Telescope Science Institute, 3700 San Marin Drive, Baltimore, MD 21218 (United States)

2012-03-01T23:59:59.000Z

403

Optimization of the multivariate calibration of a Vis–NIR sensor for the on-line monitoring of marine diesel engine lubricating oil by variable selection methods  

Science Journals Connector (OSTI)

Abstract This paper deals with the description of the optimization by variable selection methods of the multivariate calibration process of a low-cost Visible–Near Infrared (400–1100 nm) sensor, developed for the on-line monitoring of the insoluble content in diesel marine engine lubricating oil. The performance of the calibration model developed for the Vis–NIR sensor was compared with the performance of the calibration model developed with spectra obtained with a UV/Vis–NIR laboratory spectrometer. The calibration results obtained with the two devices were compared to determine the limitations of the sensor system with respect to the laboratory equipment. First, the spectra were correlated with the insoluble content analyzed in Wearcheckiberica's oil laboratories obtaining a calibration model based on Partial Least Squares-regression (PLSR). Once the pre-processing strategy had been defined, the most significant predictor variables were chosen with the help of Martens uncertainty test, interval Partial Least Squares (iPLS) and Genetic Algorithms (GA) variable selection techniques. Finally, the two models were compared based on the number of latent variables of each model of the values of the Root Mean Square Error of the Cross Validation (RMSECV), the Standard Error of Performance (SECV) and the Ratio of Prediction to Deviation (RPD).

Alberto Villar; Santiago Fernández; Eneko Gorritxategi; José I. Ciria; Luis A. Fernández

2014-01-01T23:59:59.000Z

404

Optimal Siting and Sizing of Distributed Energy Resources  

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

Optimal Siting and Sizing of Distributed Energy Resources Optimal Siting and Sizing of Distributed Energy Resources Speaker(s): Johan Driesen Date: February 15, 2007 - 12:00pm Location: 90-3122 Seminar Host/Point of Contact: Chris Marnay Ongoing changes in the operation of distribution grids call for a new way to plan grid modifications. This presentation gives an overview of possible methods of long-term planning for the deployment of Distributed Energy Resources (distributed generation, storage and controllable loads) in a given grid. The placement and sizing of the units have to be considered, making this a complex optimization problem with discrete and continuous variables. In the optimization problem, multiple objectives are often conflicting, e.g. minimal grid losses, maximal use of the resources and voltage stability. An evolutionary algorithm (genetic algorithms) is used

405

Investigation of a Novel NDE Method for Monitoring Thermomechanical Damage and Microstructure Evolution in Ferritic-Martensitic Steels for Generation IV Nuclear Energy Systems  

SciTech Connect (OSTI)

The main goal of the proposed project is the development of validated nondestructive evaluation (NDE) techniques for in situ monitoring of ferritic-martensitic steels like Grade 91 9Cr-1Mo, which are candidate materials for Generation IV nuclear energy structural components operating at temperatures up to ~650{degree}C and for steam-generator tubing for sodium-cooled fast reactors. Full assessment of thermomechanical damage requires a clear separation between thermally activated microstructural evolution and creep damage caused by simultaneous mechanical stress. Creep damage can be classified as "negligible" creep without significant plastic strain and "ordinary" creep of the primary, secondary, and tertiary kind that is accompanied by significant plastic deformation and/or cavity nucleation and growth. Under negligible creep conditions of interest in this project, minimal or no plastic strain occurs, and the accumulation of creep damage does not significantly reduce the fatigue life of a structural component so that low-temperature design rules, such as the ASME Section III, Subsection NB, can be applied with confidence. The proposed research project will utilize a multifaceted approach in which the feasibility of electrical conductivity and thermo-electric monitoring methods is researched and coupled with detailed post-thermal/creep exposure characterization of microstructural changes and damage processes using state-of-the-art electron microscopy techniques, with the aim of establishing the most effective nondestructive materials evaluation technique for particular degradation modes in high-temperature alloys that are candidates for use in the Next Generation Nuclear Plant (NGNP) as well as providing the necessary mechanism-based underpinnings for relating the two. Only techniques suitable for practical application in situ will be considered. As the project evolves and results accumulate, we will also study the use of this technique for monitoring other GEN IV materials. Through the results obtained from this integrated materials behavior and NDE study, new insight will be gained into the best nondestructive creep and microstructure monitoring methods for the particular mechanisms identified in these materials. The proposed project includes collaboration with a national laboratory partner and the results will also serve as a foundation to guide the efforts of scientists in the DOE laboratory, university, and industrial communities concerned with the technological challenges of monitoring creep and microstructural evolution in materials planned to be used in Generation IV Nuclear Energy Systems.

Nagy, Peter

2013-09-30T23:59:59.000Z

406

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

407

Chopped random-basis quantum optimization  

E-Print Network [OSTI]

In this work we describe in detail the "Chopped RAndom Basis" (CRAB) optimal control technique recently introduced to optimize t-DMRG simulations [arXiv:1003.3750]. Here we study the efficiency of this control technique in optimizing different quantum processes and we show that in the considered cases we obtain results equivalent to those obtained via different optimal control methods while using less resources. We propose the CRAB optimization as a general and versatile optimal control technique.

Tommaso Caneva; Tommaso Calarco; Simone Montangero

2011-08-22T23:59:59.000Z

408

Optimal management of hybrid PV/fuel cell/battery power system: A comparison of optimal hybrid approaches  

Science Journals Connector (OSTI)

Abstract In this paper, different optimal hybrid techniques have been proposed for management of a hybrid power generation system including photovoltaic (PV), fuel cell and battery. The main power of the hybrid system comes from the photovoltaic panels, while the fuel cell and batteries are used as back up units. In order to achieve maximum power point tracking for the photovoltaic system, both fuzzy logic controller and perturb and observation methods are examined and their performances have been investigated via simulations. Next, the performance of the hybrid system has been improved via employing a family of well-known optimization approaches for load sharing among the available resources. Imperialist Competitive Algorithm (ICA), Particle Swarm Optimization (PSO), Quantum behaved Particle Swarm Optimization (QPSO), Ant Colony Optimization (ACO), and Cuckoo Optimization Algorithm (COA) are used to manage the load sharing to achieve optimal performance while the system constraints are met. The optimal performance has been characterized via the control strategy performance measure being the ratio of the amount of hydrogen production with respect to the hydrogen consumption. In order to verify the system performance, simulation studies have been carried out using practical load demand data and real weather data (solar irradiance and air temperature). Different combination of maximum power point tracking methods with various optimization algorithms have been compared with each other. The results show that the combination of fuzzy logic controller with QPSO has the best performance among the considered combinations. In this situation, when the solar irradiation is noticeably high, the required load is supplied mainly by PV array, while the battery is charged, simultaneously. In the other times, the load is mainly fed by the battery and fuel cell while the performance constraints of battery is met and the daily performance measure is optimized.

Nooshin Bigdeli

2015-01-01T23:59:59.000Z

409

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...

410

Application of linear programming redispatch technique to dynamic generation allocation  

SciTech Connect (OSTI)

This paper considers dispatch problems that involve the allocation of system generation optimally among generating units while tracking a load curve and observing power rate limits of the units, system spinning reserve requirements and other security constraints. Two methods are used in the solution of the problem. The first method is quadratic programming technique combined with a linear programming redispatch technique. The latter utilizes a linear programming formulation of the dynamic dispatch problem about the base case static economic dispatch solution. Tests and computer results on 4 systems of different combinations of units and intervals are given to show the advantages of the techniques proposed.

Somuah, C.B. (Dept. of Electrical Engr., KFUPM, Dhahran 31261 (SA)); Khunaizi, N. (Saudi Consolidated Electric Co., In the Eastern Province, Dammam (SA))

1990-02-01T23:59:59.000Z

411

Optimization 1-1 Convex Optimization & Duality  

E-Print Network [OSTI]

1 Optimization 1-1 Convex Optimization & Duality EEN634, Spring 2007 BASED ON LECTURES GIVEN AT MIT and Princeton Department of ECE, UMiami Optimization 1-2 #12;2 Optimization 1-3 Optimization 1-4 #12;3 Optimization 1-5 Optimization 1-6 #12;4 Optimization 1-7 Optimization 1-8 #12;5 Optimization 1-9 Optimization 1

Fan, Xingzhe

412

Nuclear energy density optimization  

Science Journals Connector (OSTI)

We carry out state-of-the-art optimization of a nuclear energy density of Skyrme type in the framework of the Hartree-Fock-Bogoliubov theory. The particle-hole and particle-particle channels are optimized simultaneously, and the experimental data set includes both spherical and deformed nuclei. The new model-based, derivative-free optimization algorithm used in this work has been found to be significantly better than standard optimization methods in terms of reliability, speed, accuracy, and precision. The resulting parameter set unedf0 results in good agreement with experimental masses, radii, and deformations and seems to be free of finite-size instabilities. An estimate of the reliability of the obtained parameterization is given, based on standard statistical methods. We discuss new physics insights offered by the advanced covariance analysis.

M. Kortelainen; T. Lesinski; J. Moré; W. Nazarewicz; J. Sarich; N. Schunck; M. V. Stoitsov; S. Wild

2010-08-13T23:59:59.000Z

413

Optimization Online - Optimal Design of Electrical Machines ...  

E-Print Network [OSTI]

Jun 8, 2011 ... Optimal Design of Electrical Machines: Mathematical Programming ... Science and Engineering (Multidisciplinary Design Optimization ).

Sonia Cafieri

2011-06-08T23:59:59.000Z

414

A matrix generation approach for eigenvalue optimization  

E-Print Network [OSTI]

Figure 1: Graph of the maximum eigenvalue of the affine combination of. symmetric ...... “C++” to compute the Gram matrix and then imported it to MATLAB by.

415

Optimal hydropower generation scheduling for a cascade  

Science Journals Connector (OSTI)

......mean head and vf the mean efficiency of station i. An alternative...maximum flow through each turbine; r"cj = DJ(y,pm...distributed between the turbines will affect efficiency, and moreover certain turbines may have 'rough-running......

KEVIN BROUGHAN; CAROLYN MCKENZIE; ALFRED SNEYD; YAN WANG

1993-01-01T23:59:59.000Z

416

OPTIMIZATION TOPICS LIST Revised April 2012  

E-Print Network [OSTI]

1 OPTIMIZATION TOPICS LIST Revised April 2012 For Fall 2012 and Spring 2013 we will adopt. Bertsimas and J. Tsitsiklis, Introduction to Linear Optimization, Athena Scientific, 1997 2. M. C. Ferris, O and mixed integer models · Existence of optimal solutions, optimality conditions · Branch and bound methods

Radeloff, Volker C.

417

Direct optimization overly optimizes data Kazunori Yoshizawa  

E-Print Network [OSTI]

OPINION Direct optimization overly optimizes data Kazunori Yoshizawa Systematic Entomology optimization is a criterion that recognizes sequence alignment and tree search as a single epistemological optimization criterion, all data partitions are combined and optimized simultaneously along with the same tree

Yoshizawa, Kazunori

418

E-Print Network 3.0 - algorithmic decision optimization Sample...  

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

numerical optimization, SQP filter algorithms... decisions, and the numerical simulation and optimization methods used for solving the problem. The paper... ....

419

Euler's fluid equations: Optimal Control vs Optimization  

E-Print Network [OSTI]

An optimization method used in image-processing (metamorphosis) is found to imply Euler's equations for incompressible flow of an inviscid fluid, without requiring that the Lagrangian particle labels exactly follow the flow lines of the Eulerian velocity vector field. Thus, an optimal control problem and an optimization problem for incompressible ideal fluid flow both yield the \\emph {same} Euler fluid equations, although their Lagrangian parcel dynamics are \\emph{different}. This is a result of the \\emph{gauge freedom} in the definition of the fluid pressure for an incompressible flow, in combination with the symmetry of fluid dynamics under relabeling of their Lagrangian coordinates. Similar ideas are also illustrated for SO(N) rigid body motion.

Darryl D. Holm

2009-09-28T23:59:59.000Z

420

Parallel Shortest Paths Methods for Globally Optimal Trajectories \\Lambda D.P. Bertsekas a , F. Guerriero b and R. Musmanno b  

E-Print Network [OSTI]

that some efficient label correcting methods for shortest path problems, the SLF and SLF/LLL methods of [3

Bertsekas, Dimitri

Note: This page contains sample records for the topic "generation optimization methods" 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

Performing aggressive code optimization with an ability to rollback changes made by the aggressive optimizations  

DOE Patents [OSTI]

Mechanisms for aggressively optimizing computer code are provided. With these mechanisms, a compiler determines an optimization to apply to a portion of source code and determines if the optimization as applied to the portion of source code will result in unsafe optimized code that introduces a new source of exceptions being generated by the optimized code. In response to a determination that the optimization is an unsafe optimization, the compiler generates an aggressively compiled code version, in which the unsafe optimization is applied, and a conservatively compiled code version in which the unsafe optimization is not applied. The compiler stores both versions and provides them for execution. Mechanisms are provided for switching between these versions during execution in the event of a failure of the aggressively compiled code version. Moreover, predictive mechanisms are provided for predicting whether such a failure is likely.

Gschwind, Michael K

2013-07-23T23:59:59.000Z

422

Integrating multi-objective optimization with computational fluid dynamics to optimize boiler combustion process of a coal fired power plant  

Science Journals Connector (OSTI)

Abstract The dominant role of electricity generation and environment consideration have placed strong requirements on coal fired power plants, requiring them to improve boiler combustion efficiency and decrease carbon emission. Although neural network based optimization strategies are often applied to improve the coal fired power plant boiler efficiency, they are limited by some combustion related problems such as slagging. Slagging can seriously influence heat transfer rate and decrease the boiler efficiency. In addition, it is difficult to measure slag build-up. The lack of measurement for slagging can restrict conventional neural network based coal fired boiler optimization, because no data can be used to train the neural network. This paper proposes a novel method of integrating non-dominated sorting genetic algorithm (NSGA II) based multi-objective optimization with computational fluid dynamics (CFD) to decrease or even avoid slagging inside a coal fired boiler furnace and improve boiler combustion efficiency. Compared with conventional neural network based boiler optimization methods, the method developed in the work can control and optimize the fields of flue gas properties such as temperature field inside a boiler by adjusting the temperature and velocity of primary and secondary air in coal fired power plant boiler control systems. The temperature in the vicinity of water wall tubes of a boiler can be maintained within the ash melting temperature limit. The incoming ash particles cannot melt and bond to surface of heat transfer equipment of a boiler. So the trend of slagging inside furnace is controlled. Furthermore, the optimized boiler combustion can keep higher heat transfer efficiency than that of the non-optimized boiler combustion. The software is developed to realize the proposed method and obtain the encouraging results through combining ANSYS 14.5, ANSYS Fluent 14.5 and CORBA C++.

Xingrang Liu; R.C. Bansal

2014-01-01T23:59:59.000Z

423

Engineering Optimization Vol. 36, No. 4, August 2004, 419438  

E-Print Network [OSTI]

Engineering Optimization Vol. 36, No. 4, August 2004, 419­438 MODE-PURSUING SAMPLING METHOD FOR GLOBAL OPTIMIZATION ON EXPENSIVE BLACK-BOX FUNCTIONS LIQUN WANGa , SONGQING SHANb and G. GARY WANGb efficient global optimization methods. This article proposes a new global optimization method for black

Wang,Liqun

424

Distributed Generation Investment by a Microgrid under Uncertainty++++ Afzal Siddiqui  

E-Print Network [OSTI]

1 Distributed Generation Investment by a Microgrid under Uncertainty++++ Afzal Siddiqui University's decision to invest in a distributed generation (DG) unit fuelled by natural gas. While the long. KEYWORDS. OR in Energy; Distributed Generation; Real Options; Optimal Investment. 1. INTRODUCTION

Guillas, Serge

425

Multi - Timescale Control of Energy Storage Enabling the Integration of Variable Generation.  

E-Print Network [OSTI]

??A two-level optimal coordination control approach for energy storage and conventional generation consisting of advanced frequency control and stochastic optimal dispatch is proposed to deal… (more)

Zhu, Dinghuan

2014-01-01T23:59:59.000Z

426

MIME 6740/8740 Optimization Theory and Applications Fall 2014 Description: The course will cover fundamental concepts of optimization and numerical  

E-Print Network [OSTI]

MIME 6740/8740 Optimization Theory and Applications Fall 2014 ________________________________________________________________________________________ Description: The course will cover fundamental concepts of optimization and numerical methods for solving optimization problems. It will present applications of optimization in mechanical and industrial engineering

Nikolaidis, Efstratios

427

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

428

Synchrony-optimized power grids  

E-Print Network [OSTI]

We investigate synchronization in power grids, which we assume to be modeled by a network of Kuramoto oscillators with inertia. More specifically, we study the optimization of the power grid topology to favor the network synchronization. We introduce a rewiring algorithm which consists basically in a hill climb scheme where the edges of the network are swapped in order enhance the main measures of synchronization. As a byproduct of the optimization algorithm, we typically have also the anticipation of the synchronization onset for the optimized network. We perform several robustness tests for the synchrony-optimized power grids, including the impact of consumption peaks. In our analyses, we investigate synthetic random networks, which we consider as hypothetical decentralized power generation situations, and also a network based in the actual power grid of Spain, which corresponds to the current paradigm of centralized power grids. The synchrony-optimized power grids obtained by our algorithm have some intere...

Pinto, Rafael S

2014-01-01T23:59:59.000Z

429

Carver Performance and Optimization  

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

Optimization Performance and Optimization Performance Monitoring Last edited: 2012-01-09 12:31:03...

430

Optimization and heat and water integration for biodiesel production  

E-Print Network [OSTI]

generation of biodiesel using waste cooking oil and algae oil. We consider 5 different technologies: Energy, Biofuels, Biodiesel, Cooking Oil, Mathematical optimization, Algae1 Optimization and heat and water integration for biodiesel production from cooking oil

Grossmann, Ignacio E.

431

Stochastic Generator of Chemical Structure. 3. Reaction Network Generation  

SciTech Connect (OSTI)

A new method to generate chemical reaction network is proposed. The particularity of the method is that network generation and mechanism reduction are performed simultaneously using sampling techniques. Our method is tested for hydrocarbon thermal cracking. Results and theoretical arguments demonstrate that our method scales in polynomial time while other deterministic network generator scale in exponential time. This finding offers the possibility to investigate complex reacting systems such as those studied in petroleum refining and combustion.

FAULON,JEAN-LOUP; SAULT,ALLEN G.

2000-07-15T23:59:59.000Z

432

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

433

Fuel cell generator energy dissipator  

DOE Patents [OSTI]

An apparatus and method are disclosed for eliminating the chemical energy of fuel remaining in a fuel cell generator when the electrical power output of the fuel cell generator is terminated. During a generator shut down condition, electrically resistive elements are automatically connected across the fuel cell generator terminals in order to draw current, thereby depleting the fuel

Veyo, Stephen Emery (Murrysville, PA); Dederer, Jeffrey Todd (Valencia, PA); Gordon, John Thomas (Ambridge, PA); Shockling, Larry Anthony (Pittsburgh, PA)

2000-01-01T23:59:59.000Z

434

The simulation tool for mission-optimized system design  

Science Journals Connector (OSTI)

A method for optimizing system design, considering control strategies, is developed. The method is numerically analyzed for the design of a simple buck converter but then is more generally applicable for mission-optimized design of large and complex ... Keywords: 3D multibody modeling, co-optimization process, gaming environment, mission-optimization

Tianlei Zhang; Jeremiah Shepherd; Jijun Tang; Roger A. Dougal

2011-06-01T23:59:59.000Z

435

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

436

Design of Optimal Regulators  

E-Print Network [OSTI]

Current research suggests the use of a liner quadratic performance index for optimal control of regulators in various applications. Some examples include correcting the trajectory of rocket and air vehicles, vibration suppression of flexible structures, and airplane stability. In all these cases, the focus is in suppressing/decreasing system deviations rapidly. However, if one compares the Linear Quadratic Regulator (LQR) solution with optimal solutions (minimum time), it is seen that the LQR solution is less than optimal in some cases indeed (3-6) times that obtained using a minimum time solution. Moreover, the LQR solution is sometimes unacceptable in practice due to the fact that values of control extend beyond admissible limits and thus the designer must choose coefficients in the linear quadratic form, which are unknown. The authors suggest methods which allow finding a quasi-optimal LQR solution with bounded control which is closed to the minimum time solution. They also remand the process of the minimum time decision. Keywords: Optimal regulator, minimum time controller, Linear Quadratic Regulator (LQR). -- This paper is declared a work of the U.S. Government and not subject to copyright protection in the USA. The manuscript is accepted as paper AIAA-2003-6638 by 2nd AIAA Unmanned Unlimited Systems, Technologies, and Operations-Aerospace, Land, and See Conference and Workshop - Exhibit, San Diego, California, USA, 15-18 Sep. 2003.

Alexander Bolonkin; Robert Sierakowski

2007-01-19T23:59:59.000Z

437

ONLINE OPTIMIZATION AND SELECTION OF MEASUREMENTS  

E-Print Network [OSTI]

117 Chapter 7 ON­LINE OPTIMIZATION AND SELECTION OF MEASUREMENTS This is the last of three chapters that discuss optimal operation of a general heat exchanger network. A method that combines the use of steady state optimization and decentralized feedback control is proposed. A general steady state model

Skogestad, Sigurd

438

Rising Cost of Generating Electricity  

Science Journals Connector (OSTI)

... METHODS are being discussed by electrical engineers to meet the rising costs of generating ... of generating electricity. Even before the War this was becoming a serious problem. In some cases it ...

1940-07-20T23:59:59.000Z

439

Tensor Principal Component Analysis via Convex Optimization  

E-Print Network [OSTI]

Dec 9, 2012 ... optimization under a rank-one constraint, for which we propose two solution methods: (1) imposing a nuclear norm penalty in the objective to ...

2012-12-09T23:59:59.000Z

440

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...

Note: This page contains sample records for the topic "generation optimization methods" 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

Development of Optimal Catalyst Designs and Operating Strategies...  

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

Coupled LNTSCR Development of Optimal Catalyst Designs and Operating Strategies for Coupled LNTSCR We introduce a new bench-scale engine generator testing system for different...

442

Matlab-based Optimization: Optimization Toolbox  

E-Print Network [OSTI]

Matlab-based Optimization: the Optimization Toolbox Gene Cliff (AOE/ICAM - ecliff@vt.edu ) 3:00pm Engineering ICAM: Interdisciplinary Center for Applied Mathematics 1 / 37 #12;Matlab's Optimization Toolbox;Matlab's Optimization Toolbox Classifying Optimization Problems A Soup Can Example Intermezzo

Crawford, T. Daniel

443

Fuzzy Optimality and Evolutionary Multiobjective Optimization  

E-Print Network [OSTI]

Fuzzy Optimality and Evolutionary Multiobjective Optimization M. Farina and P. Amato. Pareto optimality is someway ineffective for optimization problems with several (more than three) objectives. In fact the Pareto optimal set tends to become a wide portion of the whole design domain search

Coello, Carlos A. Coello

444

Steam System Optimization : A Case Study  

E-Print Network [OSTI]

The steam system optimization (generation, distribution, use and condensate return) offers a large opportunity for action to comply with the new levels of energy efficiency standards. Superior design and improved maintenance practices are the two...

Iordanova, N.; Venkatesan, V. V.; Calogero, M.

445

Search based algorithms for test sequence generation in functional testing  

Science Journals Connector (OSTI)

AbstractContext The generation of dynamic test sequences from a formal specification, complementing traditional testing methods in order to find errors in the source code. Objective In this paper we extend one specific combinatorial test approach, the Classification Tree Method (CTM), with transition information to generate test sequences. Although we use CTM, this extension is also possible for any combinatorial testing method. Method The generation of minimal test sequences that fulfill the demanded coverage criteria is an NP-hard problem. Therefore, search-based approaches are required to find such (near) optimal test sequences. Results The experimental analysis compares the search-based technique with a greedy algorithm on a set of 12 hierarchical concurrent models of programs extracted from the literature. Our proposed search-based approaches (GTSG and ACOts) are able to generate test sequences by finding the shortest valid path to achieve full class (state) and transition coverage. Conclusion The extended classification tree is useful for generating of test sequences. Moreover, the experimental analysis reveals that our search-based approaches are better than the greedy deterministic approach, especially in the most complex instances. All presented algorithms are actually integrated into a professional tool for functional testing.

Javier Ferrer; Peter M. Kruse; Francisco Chicano; Enrique Alba

2015-01-01T23:59:59.000Z

446

Optimization of neural network feedback control systems using automatic differentiation  

E-Print Network [OSTI]

Optimal control problems can be challenging to solve, whether using analytic or numerical methods. This thesis examines the application of an adjoint method for optimal feedback control, which combines various algorithmic ...

Rollins, Elizabeth, S.M. Massachusetts Institute of Technology

2009-01-01T23:59:59.000Z

447

E-Print Network 3.0 - avoidance trajectory generation Sample...  

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

"tail" trajectory... -adaptive generation of optimal continuous trajectories for mobile robots. In International Symposium on Artificial... and N. Miyake. Trajectory...

448

PARETO: A novel evolutionary optimization approach to multiobjective IMRT planning  

SciTech Connect (OSTI)

Purpose: In radiation therapy treatment planning, the clinical objectives of uniform high dose to the planning target volume (PTV) and low dose to the organs-at-risk (OARs) are invariably in conflict, often requiring compromises to be made between them when selecting the best treatment plan for a particular patient. In this work, the authors introduce Pareto-Aware Radiotherapy Evolutionary Treatment Optimization (pareto), a multiobjective optimization tool to solve for beam angles and fluence patterns in intensity-modulated radiation therapy (IMRT) treatment planning. Methods: pareto is built around a powerful multiobjective genetic algorithm (GA), which allows us to treat the problem of IMRT treatment plan optimization as a combined monolithic problem, where all beam fluence and angle parameters are treated equally during the optimization. We have employed a simple parameterized beam fluence representation with a realistic dose calculation approach, incorporating patient scatter effects, to demonstrate feasibility of the proposed approach on two phantoms. The first phantom is a simple cylindrical phantom containing a target surrounded by three OARs, while the second phantom is more complex and represents a paraspinal patient. Results: pareto results in a large database of Pareto nondominated solutions that represent the necessary trade-offs between objectives. The solution quality was examined for several PTV and OAR fitness functions. The combination of a conformity-based PTV fitness function and a dose-volume histogram (DVH) or equivalent uniform dose (EUD) -based fitness function for the OAR produced relatively uniform and conformal PTV doses, with well-spaced beams. A penalty function added to the fitness functions eliminates hotspots. Comparison of resulting DVHs to those from treatment plans developed with a single-objective fluence optimizer (from a commercial treatment planning system) showed good correlation. Results also indicated that pareto shows promise in optimizing the number of beams. Conclusions: This initial evaluation of the evolutionary optimization software tool pareto for IMRT treatment planning demonstrates feasibility and provides motivation for continued development. Advantages of this approach over current commercial methods for treatment planning are many, including: (1) fully automated optimization that avoids human controlled iterative optimization and potentially improves overall process efficiency, (2) formulation of the problem as a true multiobjective one, which provides an optimized set of Pareto nondominated solutions refined over hundreds of generations and compiled from thousands of parameter sets explored during the run, and (3) rapid exploration of the final nondominated set accomplished by a graphical interface used to select the best treatment option for the patient.

Fiege, Jason; McCurdy, Boyd; Potrebko, Peter; Champion, Heather; Cull, Andrew [Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba R3T 2N2 (Canada); Department of Physics and Astronomy, University of Manitoba Winnipeg, Manitoba R3T 2N2, Canada Division of Medical Physics, CancerCare Manitoba, Winnipeg, Manitoba R3E 0V9, Canada and Department of Radiology, University of Manitoba, Winnipeg, Manitoba R3T 2N2 (Canada); Kleysen Institute for Advanced Medicine, Winnipeg Health Sciences Centre, Winnipeg, Manitoba R3A 1R9 (Canada); Department of Physics and Astronomy, University of Manitoba Winnipeg, Manitoba R3T 2N2, Canada and Division of Medical Physics, CancerCare Manitoba, Winnipeg, Manitoba R3E 0V9 (Canada); Department of Physics and Astronomy, University of Manitoba Winnipeg, Manitoba R3T 2N2, Canada and Division of Medical Physics, CancerCare Manitoba, Winnipeg, Manitoba R3E 0V9 (Canada)

2011-09-15T23:59:59.000Z

449

OPTIMIZING YOUR  

E-Print Network [OSTI]

Electric motor-driven systems are estimated to consume over half of all electricity in the United States and over 70 % of all electricity in many industrial plants. This fact sheet presents an overview of electric drive systems and highlights common ways you can improve system efficiency and reliability. By optimizing the efficiency of your motor-driven systems, you can increase productivity while saving significant amounts of energy and money.

unknown authors

450

Optimization Online - Global Optimization Submissions - 2014  

E-Print Network [OSTI]

Zhao Sun. February 2014. Global optimization on the torus, the sphere and the rotation ... RBFOpt: an open-source library for black-box optimization with costly ...

451

Siting and sizing of distributed generation units using GA and OPF  

Science Journals Connector (OSTI)

This paper deals with the important task of finding the optimal siting and sizing of Distributed Generation (DG) units for a given distribution network so that the cost of active and reactive power generation can be minimized. The optimization technique ... Keywords: distributed generation, genetic alghorithm(GA), optimal power flow(OPF)

M. Hosseini Aliabadi; M. Mardaneh; B. Behbahan

2008-01-01T23:59:59.000Z

452

Optimization Jason Courter  

E-Print Network [OSTI]

Optimization Jason Courter Foundations of Ecology #12;What is optimization? Maximization Minimization Optimization Natural Selection 1. Variation 2. Heritable Variation 3. Differential Reproduction #12;On Optimal use of a Patchy Environment · Robert MacArthur · Eric Pianka http

Jodice, Patrick

453

Apparatus and methods of reheating gas turbine cooling steam and high pressure steam turbine exhaust in a combined cycle power generating system  

DOE Patents [OSTI]

In a combined cycle system having a multi-pressure heat recovery steam generator, a gas turbine and steam turbine, steam for cooling gas turbine components is supplied from the intermediate pressure section of the heat recovery steam generator supplemented by a portion of the steam exhausting from the HP section of the steam turbine, steam from the gas turbine cooling cycle and the exhaust from the HP section of the steam turbine are combined for flow through a reheat section of the HRSG. The reheated steam is supplied to the IP section inlet of the steam turbine. Thus, where gas turbine cooling steam temperature is lower than optimum, a net improvement in performance is achieved by flowing the cooling steam exhausting from the gas turbine and the exhaust steam from the high pressure section of the steam turbine in series through the reheater of the HRSG for applying steam at optimum temperature to the IP section of the steam turbine.

Tomlinson, Leroy Omar (Niskayuna, NY); Smith, Raub Warfield (Ballston Lake, NY)

2002-01-01T23:59:59.000Z

454

Manufacture of thermoelectric generator structures by fiber drawing  

DOE Patents [OSTI]

Methods of manufacturing a thermoelectric generator via fiber drawing and corresponding or associated thermoelectric generator devices are provided.

McIntyre, Timothy J; Simpson, John T; West, David L

2014-11-18T23:59:59.000Z

455

Optimization Online - Digest Archive  

E-Print Network [OSTI]

Optimization Online Digest Archive. Subscribe to the digest. ... Online is supported by the Mathematical Optmization Society. Mathematical Optimization Society.

456

Optimization Online - Category Archive  

E-Print Network [OSTI]

Optimization Online. Browse Submissions By Area. Linear, Cone and Semidefinite ... Optimization Online is supported by the Mathematical Optmization Society.

457

Optimization Online - Coordinators  

E-Print Network [OSTI]

Optimization Online submissions are electronically handled by a team of ... OR and Management Sciences / Integer Programming / Robust Optimization ...

458

Optimization Online - Category Archive  

E-Print Network [OSTI]

Optimization Online. Browse Submissions By Area. Nonlinear Optimization. 2000 · 2001 · 2002 · 2003 · 2004 · 2005 · 2006 · 2007 · 2008 · 2009 · 2010 · 2011 ...

459

Multi-objective stochastic dynamic economic emission dispatch enhancement by fuzzy adaptive modified theta particle swarm optimization  

Science Journals Connector (OSTI)

This paper presents a new method based on fuzzy adaptive modified theta particle swarm optimization to investigate the multiobjective day-ahead dynamic economic emission dispatch (DEED) problem considering the effect of wind power generators. The proposed algorithm concurrently reduces the total fuel cost as well as the total emission during the optimization process. Besides by considering the uncertainty of hourly load/wind forecast a scenario-based approach has been implemented such that the DEED problem would be studied in a stochastic environment referred to as stochastic DEED. In order to see the efficiency and feasibility of the proposed method two standard test systems are employed as the case studies.

Bahman Bahmanifirouzi; Ebrahim Farjah; Taher Niknam

2012-01-01T23:59:59.000Z

460

Minimizing electricity costs with an auxiliary generator using stochastic programming  

E-Print Network [OSTI]

This thesis addresses the problem of minimizing a facility's electricity costs by generating optimal responses using an auxiliary generator as the parameter of the control systems. The-goal of the thesis is to find an ...

Rafiuly, Paul, 1976-

2000-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "generation optimization methods" 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

RNG: A Practitioner's Overview Random Number Generation  

E-Print Network [OSTI]

RNG: A Practitioner's Overview Random Number Generation A Practitioner's Overview Prof. Michael and Monte Carlo Methods Pseudorandom number generation Types of pseudorandom numbers Properties of these pseudorandom numbers Parallelization of pseudorandom number generators New directions for SPRNG Quasirandom

Mascagni, Michael

462

Optimization Online - Nonlinear Optimization Submissions - 2014  

E-Print Network [OSTI]

Unconstrained Optimization Generalized Inexact Proximal Algorithms: Habit's/ Routine's Formation with Resistance to Change, following Worthwhile Changes

463

Apparatus and method for controlling autotroph cultivation  

DOE Patents [OSTI]

A method includes receiving at least one measurement of a dissolved carbon dioxide concentration of a mixture of fluid containing an autotrophic organism. The method also includes determining an adjustment to one or more manipulated variables using the at least one measurement. The method further includes generating one or more signals to modify the one or more manipulated variables based on the determined adjustment. The one or more manipulated variables could include a carbon dioxide flow rate, an air flow rate, a water temperature, and an agitation level for the mixture. At least one model relates the dissolved carbon dioxide concentration to one or more manipulated variables, and the adjustment could be determined by using the at least one model to drive the dissolved carbon dioxide concentration to at least one target that optimize a goal function. The goal function could be to optimize biomass growth rate, nutrient removal and/or lipid production.

Fuxman, Adrian M; Tixier, Sebastien; Stewart, Gregory E; Haran, Frank M; Backstrom, Johan U; Gerbrandt, Kelsey

2013-07-02T23:59:59.000Z

464

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

465

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

466

An Innovative Three-Dimensional Heterogeneous Coarse-Mesh Transport Method for Advanced and Generation IV Reactor Core Analysis and Design  

SciTech Connect (OSTI)

This project has resulted in a highly efficient method that has been shown to provide accurate solutions to a variety of 2D and 3D reactor problems. The goal of this project was to develop (1) an accurate and efficient three-dimensional whole-core neutronics method with the following features: based sollely on transport theory, does not require the use of cross-section homogenization, contains a highly accurate and self-consistent global flux reconstruction procedure, and is applicable to large, heterogeneous reactor models, and to (2) create new numerical benchmark problems for code cross-comparison.

Farzad Rahnema

2009-11-12T23:59:59.000Z

467

Synthesis of Li-excess layered cathode material with enhanced reversible capacity for Lithium ion batteries through the optimization of precursor synthesis method  

Science Journals Connector (OSTI)

Abstract LixNi1/3Mn2/3O2 cathode materials have been synthesized through a facile reduction-ion exchange of P3-Na2/3Ni1/3Mn2/3O2 precursors prepared by solid state (SS), spray dry (SD) and co-precipitation (CP) methods. The influence of precursor synthesis method on the structure, morphology and electrochemical performances of LixNi1/3Mn2/3O2 has been investigated. X-ray diffraction (XRD) results of LixNi1/3Mn2/3O2 demonstrate that all the samples exhibit similar XRD patterns as those of Lithium-excess layered cathode materials. Scanning Electron Microscope (SEM) images and Brunauer-Emment-Teller (BET) results present that the particle size, particle aggregation and surface area changed greatly with the precursor synthesis method. Galvanostatic charge-discharge results show that Li1.41Ni0.32Mn0.66O2+? cathode prepared from co-precipitation precursor exhibited high first discharge capacity of ca. 270 mAhg?1 with an initial cycle efficiency as high as 98%. The discharge capacity of Li1.41Ni0.32Mn0.66O2+? cathode after 30 cycles is over 250 mAhg?1 and it can deliver a discharge capacity roughly 210 mAhg?1 at a current density of 500 mAg?1 (2 C rate). Also, it was found that Li1.41Ni0.32Mn0.66O2+? cathode shows enhanced electrochemical performance over the Li2/3Ni1/3Mn2/3O2 cathode with respect to reversible capacity and rate capability.

Wenwen Zhao; Shinji Yamamoto; Akinobu Tanaka; Hideyuki Noguchi

2014-01-01T23:59:59.000Z

468

Optimization of automation: I. Estimation method of cognitive automation rates reflecting the effects of automation on human operators in nuclear power plants  

Science Journals Connector (OSTI)

Abstract Since automation was introduced in various industrial fields, the concept of the automation rate has been used to indicate the inclusion proportion of automation among all work processes or facilities. Expressions of the inclusion proportion of automation are predictable, as is the ability to express the degree of the enhancement of human performance. However, many researchers have found that a high automation rate does not guarantee high performance. Therefore, to reflect the effects of automation on human performance, this paper proposes a new estimation method of the automation rate that considers the effects of automation on human operators in nuclear power plants (NPPs). Automation in \\{NPPs\\} can be divided into two types: system automation and cognitive automation. Some general descriptions and characteristics of each type of automation are provided, and the advantages of automation are investigated. The advantages of each type of automation are used as measures of the estimation method of the automation rate. One advantage was found to be a reduction in the number of tasks, and another was a reduction in human cognitive task loads. The system and the cognitive automation rate were proposed as quantitative measures by taking advantage of the aforementioned benefits. To quantify the required human cognitive task loads and thus suggest the cognitive automation rate, Conant’s information-theory-based model was applied. The validity of the suggested method, especially as regards the cognitive automation rate, was proven by conducting experiments. The result showed that a decreased rate of the operator working time was significantly related to the cognitive automation rate and that the calculation of the cognitive task load was useful as a measure of the cognitive automation rate.

Seung Min Lee; Jong Hyun Kim; Poong Hyun Seong

2014-01-01T23:59:59.000Z

469

Computation of the maximum loadability of a power system using nonlinear optimization  

E-Print Network [OSTI]

Between Generator and Load. . . . . . . . . 34 E. Flowchart for Optimization Program F. Tutorial Example G. Conclusion. . 35 36 44 V SIMULATION RESULTS. 45 A. Introduction. B. Results of Simulation for Maximum Loadability of the Total System. I... of this work starting from the basics. Chapter III will cover concepts of power flow and loadability along with tutorial example. The literature survey over this topic and previous work as well as problem statement and solution method will be covered...

Khabirov, Abdufarrukh

2001-01-01T23:59:59.000Z

470

Capture and evolution of dust in planetary mean-motion resonances: a fast, semi-analytic method for generating resonantly trapped disk images  

E-Print Network [OSTI]

Dust grains migrating under Poynting-Robertson drag may be trapped in mean-motion resonances with planets. Such resonantly trapped grains are observed in the solar system. In extrasolar systems, the exozodiacal light produced by dust grains is expected to be a major obstacle to future missions attempting to directly image terrestrial planets. The patterns made by resonantly trapped dust, however, can be used to infer the presence of planets, and the properties of those planets, if the capture and evolution of the grains can be modelled. This has been done with N-body methods, but such methods are computationally expensive, limiting their usefulness when considering large, slowly evolving grains, and for extrasolar systems with unknown planets and parent bodies, where the possible parameter space for investigation is large. In this work, we present a semi-analytic method for calculating the capture and evolution of dust grains in resonance, which can be orders of magnitude faster than N-body methods. We calibr...

Shannon, Andrew; Wyatt, Mark

2015-01-01T23:59:59.000Z

471

Design optimization of an out-of-plane gap-closing electrostatic Vibration Energy Harvester (VEH) with a limitation on the output voltage  

Science Journals Connector (OSTI)

This paper presents a simple analytical method to optimize the efficiency of an electrostatic out-of-plane gap-closing (OPGC) Vibration Energy Harvesters (VEH). For the first time the electrical and mechanical behaviours of the transducer are addressed ... Keywords: Electrostatic transduction, Energy conversion, MEMS, Microtechnology, Power generation, Vibration energy harvesting/scavenging

R. Guillemet; P. Basset; D. Galayko; T. Bourouina

2012-04-01T23:59:59.000Z

472

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

473

Optimal Newton-type methods for nonconvex smooth optimization ...  

E-Print Network [OSTI]

Jun 19, 2011 ... We consider a general class of second-order iterations for unconstrained ...... greater than k0 such that the lower bound on ?k does not hold. 2.

2011-06-22T23:59:59.000Z

474

Optimal Supply Functions in Electricity Markets with Option Contracts and Non-smooth Costs  

Science Journals Connector (OSTI)

In this paper we investigate the optimal supply function for a generator who sells electricity into a wholesale electricity spot market and whose profit function is ... generator owns several generation units wit...

Edward J. Anderson; Huifu Xu

2006-07-01T23:59:59.000Z

475

Industrial Optimization Compact Course  

E-Print Network [OSTI]

Industrial Optimization Compact Course and Challenge Workshop Optimization plays a crucial role of the processes are typically nonlinear and dyna- mic. Thus, complex dynamic optimization or optimal control in industrial optimization. February 17­20, 2014 ·9.00­17.00 IWR ·Im Neuenheimer Feld 368 ·69120 Heidelberg www

Kirches, Christian

476

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 electrons reflecting from the virtual cathode. A magnet is provided to produce an optimum magnetic field having the field strength effective to form an annular beam from the emitted electrons in substantial alignment with the annular anode slit. The magnetic field, however, does permit the reflected electrons to axially diverge from the annular beam. The reflected electrons are absorbed by the anode in returning to the real cathode, such that substantially no reflexing electrons occur. The resulting microwaves are produced with a single dominant mode and are substantially monochromatic relative to conventional virtual cathode microwave generators. 6 figs.

Kwan, T.J.T.; Snell, C.M.

1987-03-31T23:59:59.000Z

477

Optimization of micro-grid system using MOPSO  

Science Journals Connector (OSTI)

Abstract Access to a reliable source of electricity is a basic need for any community as it can improve the living standards characterized via the improvement of healthcare, education, and the local economy at large. There are two key factors to consider when assessing the appropriateness of a micro-grid system, the cost-effectiveness of the system and the quality of service. The tradeoff between cost and reliability of the system is a major compromise in designing hybrid systems. In this way, optimization of a Hybrid Micro-Grid System (HMGS) is investigated. A hybrid wind/PV system with battery storage and diesel generator is used for this purpose. The power management algorithm is applied to the load, and the Multi-Objective Particle Swarm Optimization (MOPSO) method is used to find the best configuration of the system and for sizing the components. A set of recent hourly wind speed data from three meteorological stations in Iran, namely: Nahavand, Rafsanjan, and Khash, are selected and tested for the optimization of HMGS. Despite design complexity of the aforementioned systems, the results show that the MOPSO optimization model produces appropriate sizing of the components for each location. It is also suggested that the use of HMGS can be considered as a good alternative to promote electrification projects and enhance energy access within remote Iranian areas or other developing countries enjoying the same or similar climatic conditions.

Hanieh Borhanazad; Saad Mekhilef; Velappa Gounder Ganapathy; Mostafa Modiri-Delshad; Ali Mirtaheri

2014-01-01T23:59:59.000Z

478

Optimal experiment design for time-lapse traveltime tomography  

SciTech Connect (OSTI)

Geophysical monitoring techniques offer the only noninvasive approach capable of assessing both the spatial and temporal dynamics of subsurface fluid processes. Increasingly, permanent sensor arrays in boreholes and on the ocean floor are being deployed to improve the repeatability and increase the temporal sampling of monitoring surveys. Because permanent arrays require a large up-front capital investment and are difficult (or impossible) to re-configure once installed, a premium is placed on selecting a geometry capable of imaging the desired target at minimum cost. We present a simple approach to optimizing downhole sensor configurations for monitoring experiments making use of differential seismic traveltimes. In our case, we use a design quality metric based on the accuracy of tomographic reconstructions for a suite of imaging targets. By not requiring an explicit singular value decomposition of the forward operator, evaluation of this objective function scales to problems with a large number of unknowns. We also restrict the design problem by recasting the array geometry into a low dimensional form more suitable for optimization at a reasonable computational cost. We test two search algorithms on the design problem: the Nelder-Mead downhill simplex method and the Multilevel Coordinate Search algorithm. The algorithm is tested for four crosswell acquisition scenarios relevant to continuous seismic monitoring, a two parameter array optimization, several scenarios involving four parameter length/offset optimizations, and a comparison of optimal multi-source designs. In the last case, we also examine trade-offs between source sparsity and the quality of tomographic reconstructions. One general observation is that asymmetric array lengths improve localized image quality in crosswell experiments with a small number of sources and a large number of receivers. Preliminary results also suggest that high-quality differential images can be generated using only a small number of optimally positioned sources.

Ajo-Franklin, J.B.

2009-10-01T23:59:59.000Z

479

The optimization problem Genetic Algorithm  

E-Print Network [OSTI]

The optimization problem Genetic Algorithm Particle Swarm Optimization Experimental results for time-power optimization META, October 27-31, 2014 1 / 25 #12;The optimization problem Genetic Algorithm Particle Swarm Optimization Experimental results Conclusions Time and energy optimization Traditionally

Giménez, Domingo

480

Effectiveness of robust optimization in intensity-modulated proton therapy planning for head and neck cancers  

SciTech Connect (OSTI)

Purpose: Intensity-modulated proton therapy (IMPT) is highly sensitive to uncertainties in beam range and patient setup. Conventionally, these uncertainties are dealt using geometrically expanded planning target volume (PTV). In this paper, the authors evaluated a robust optimization method that deals with the uncertainties directly during the spot weight optimization to ensure clinical target volume (CTV) coverage without using PTV. The authors compared the two methods for a population of head and neck (H and N) cancer patients. Methods: Two sets of IMPT plans were generated for 14 H and N cases, one being PTV-based conventionally optimized and the other CTV-based robustly optimized. For the PTV-based conventionally optimized plans, the uncertainties are accounted for by expanding CTV to PTV via margins and delivering the prescribed dose to PTV. For the CTV-based robustly optimized plans, spot weight optimization was guided to reduce the discrepancy in doses under extreme setup and range uncertainties directly, while delivering the prescribed dose to CTV rather than PTV. For each of these plans, the authors calculated dose distributions under various uncertainty settings. The root-mean-square dose (RMSD) for each voxel was computed and the area under the RMSD-volume histogram curves (AUC) was used to relatively compare plan robustness. Data derived from the dose volume histogram in the worst-case and nominal doses were used to evaluate the plan optimality. Then the plan evaluation metrics were averaged over the 14 cases and were compared with two-sided paired t tests. Results: CTV-based robust optimization led to more robust (i.e., smaller AUCs) plans for both targets and organs. Under the worst-case scenario and the nominal scenario, CTV-based robustly optimized plans showed better target coverage (i.e., greater D{sub 95%}), improved dose homogeneity (i.e., smaller D{sub 5%}- D{sub 95%}), and lower or equivalent dose to organs at risk. Conclusions: CTV-based robust optimization provided significantly more robust dose distributions to targets and organs than PTV-based conventional optimization in H and N using IMPT. Eliminating the use of PTV and planning directly based on CTV provided better or equivalent normal tissue sparing.

Liu Wei; Li Xiaoqiang; Park, Peter C.; Ronald Zhu, X.; Mohan, Radhe [Department of Radiation Physics, University of Texas MD Anderson Cancer Center, Houston, Texas 77030 (United States); Frank, Steven J. [Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas 77030 (United States); Li Yupeng [Varian Medical Systems, Inc., Palo Alto, California 94304 (United States); Dong Lei [Scripps Proton Center, San Diego, California 92121 (United States)

2013-05-15T23:59:59.000Z

Note: This page contains sample records for the topic "generation optimization methods" 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

Shrinking Procedures and Optimal Algorithms  

E-Print Network [OSTI]

Jun 18, 2012 ... Optimal Stochastic Approximation Algorithms for Strongly Convex Stochastic Composite Optimization, II: Shrinking Procedures and Optimal ...

Saeed Ghadimi

2012-06-18T23:59:59.000Z

482

Oscillating fluid power generator  

SciTech Connect (OSTI)

A system and method for harvesting the kinetic energy of a fluid flow for power generation with a vertically oriented, aerodynamic wing structure comprising one or more airfoil elements pivotably attached to a mast. When activated by the moving fluid stream, the wing structure oscillates back and forth, generating lift first in one direction then in the opposite direction. This oscillating movement is converted to unidirectional rotational movement in order to provide motive power to an electricity generator. Unlike other oscillating devices, this device is designed to harvest the maximum aerodynamic lift forces available for a given oscillation cycle. Because the system is not subjected to the same intense forces and stresses as turbine systems, it can be constructed less expensively, reducing the cost of electricity generation. The system can be grouped in more compact clusters, be less evident in the landscape, and present reduced risk to avian species.

Morris, David C

2014-02-25T23:59:59.000Z

483

COMBINATORIAL OPTIMIZATION IN TELECOMMUNICATIONS  

E-Print Network [OSTI]

COMBINATORIAL OPTIMIZATION IN TELECOMMUNICATIONS MAURICIO G. C. RESENDE Abstract. Combinatorial to optimally design a SONET ring network. The last problem comes up when planning a global telecommunications network. 1. Introduction Combinatorial optimization problems are abundant in the telecommunications

Resende, Mauricio G. C.

484

Essays on optimal taxation  

E-Print Network [OSTI]

This thesis studies the optimal income tax scheme in four different settings. Chapter 1 focuses on the implications of lack of commitment for the optimal labor and capital income tax rates. It finds that it is optimal to ...

Reis, Catarina (Catarina Luis Monteiro dos)

2007-01-01T23:59:59.000Z

485

Compiler Optimization Jordan Bradshaw  

E-Print Network [OSTI]

Compiler Optimization Jordan Bradshaw #12;Outline Overview Goals and Considerations ­ Scope. 346- 352. Print. "Compiler Optimization." Wikipedia. Wikimedia Foundation, 25 04 2010. Web. 25 Apr 2010. #12;Compiler Optimization Goals: ­ Speed

Valtorta, Marco

486

Pessimistic Bilevel Optimization  

E-Print Network [OSTI]

We study a variant of the pessimistic bilevel optimization problem, which comprises constraints that must be satisfied for any optimal solution of a subordinate (lower-level) optimization problem. We present conditions ...

Wiesemann, Wolfram

487

Optimization Online - Semidefinite Optimization Approaches to ...  

E-Print Network [OSTI]

Sep 16, 2014 ... Semidefinite Optimization Approaches to Applications in Facility ... Category 2: Applications -- OR and Management Sciences (Transportation ).

Philipp Hungerlaender

2014-09-16T23:59:59.000Z

488

Cooperative and Non-Cooperative house energy optimization in a Smart Grid perspective  

Science Journals Connector (OSTI)

Energy demand management for residential users is a promising research area within the Smart Grid revolution. The whole energy generation and distribution system performance can indeed be improved by optimizing the house energy management while still ... Keywords: energy consumption, noncooperative house energy optimization, smart grid perspective, energy demand management, energy generation, distribution system performance, optimal planning

A. Barbato; A. Capone; G. Carello; M. Delfanti; M. Merlo; A. Zaminga

2011-06-01T23:59:59.000Z

489

Environmental externalities: Applying the concept to Asian coal-based power generation. [Includes external environmental and societal costs and methods of evaluating them  

SciTech Connect (OSTI)

This report examines the concept of environmental externality. It discusses various factors -- the atmospheric transformations, relationship of point-source emissions to ambient air quality, dose-response relationships, applicable cause-and-effect principles, and risk and valuation research -- that are considered by a number of state utilities when they apply the environmental externality concept to energy resource planning. It describes a methodology developed by Argonne National Laboratory for general use in resource planning, in combination with traditional methods that consider the cost of electricity production. Finally, it shows how the methodology can be applied in Indonesia, Thailand, and Taiwan to potential coal-fired power plant projects that will make use of clean coal technologies.

Szpunar, C.B.; Gillette, J.L.

1993-03-01T23:59:59.000Z

490

Optimal Heliostat Layout for Concentrating Solar Tower Systems  

Science Journals Connector (OSTI)

A methodology to give an optimal layout of a group of heliostats has been developed for concentrating solar tower ... the method determines an optimal configuration of a heliostat field around a tower where refle...

Motoaki Utamura; Yutaka Tamaura…

2007-01-01T23:59:59.000Z

491

Optimization Online - Digest  

E-Print Network [OSTI]

Complete the form below to subscribe to the free Optimization Online Digest. ... Type your e-mail address to unsubscribe from the Optimization Online Digest.

492

PDSF Performance and Optimization  

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

Optimization Performance and Optimization Running Jobs Efficiently This page defines job efficiency and how to measure the efficiency of your jobs. Read More PDSF IO Monitoring...

493

Magnetocumulative generator  

DOE Patents [OSTI]

An improved magnetocumulative generator is described that is useful for producing magnetic fields of very high energy content over large spatial volumes. The polar directed pleated magnetocumulative generator has a housing providing a housing chamber with an electrically conducting surface. The chamber forms a coaxial system having a small radius portion and a large radius portion. When a magnetic field is injected into the chamber, from an external source, most of the magnetic flux associated therewith positions itself in the small radius portion. The propagation of an explosive detonation through high-explosive layers disposed adjacent to the housing causes a phased closure of the chamber which sweeps most of the magnetic flux into the large radius portion of the coaxial system. The energy content of the magnetic field is greatly increased by flux stretching as well as by flux compression. The energy enhanced magnetic field is utilized within the housing chamber itself.

Pettibone, J.S.; Wheeler, P.C.

1981-06-08T23:59:59.000Z

494

Monthly Generation System Peak (pbl/generation)  

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

Generation > Generation Hydro Power Wind Power Monthly GSP BPA White Book Dry Year Tools Firstgov Monthly Generation System Peak (GSP) This site is no longer maintained. Page last...

495

Photon generator  

DOE Patents [OSTI]

A photon generator includes an electron gun for emitting an electron beam, a laser for emitting a laser beam, and an interaction ring wherein the laser beam repetitively collides with the electron beam for emitting a high energy photon beam therefrom in the exemplary form of x-rays. The interaction ring is a closed loop, sized and configured for circulating the electron beam with a period substantially equal to the period of the laser beam pulses for effecting repetitive collisions.

Srinivasan-Rao, Triveni (Shoreham, NY)

2002-01-01T23:59:59.000Z

496

Optimal tuning of PI controller using PSO optimization for indirect power control for DFIG based wind turbine with MPPT  

Science Journals Connector (OSTI)

In this paper, an artificial intelligence method particle swarm optimization (PSO) algorithm is presented for determining the optimal PI controller parameters for the indirect control active and reactive power of...

Youcef Bekakra; Djilani Ben Attous

2014-09-01T23:59:59.000Z

497

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

498

Aerodynamic Shape Design of Transonic Airfoils Using Hybrid Optimization Techniques and CFD  

E-Print Network [OSTI]

This paper will analyze the effects of using hybrid optimization methods for optimizing objective functions that are determined by computational fluid dynamics solvers for compressible viscous flow for optimal design of ...

Xing, X.Q.

499

Multi-objective optimal design of steel trusses in unstructured design domains  

E-Print Network [OSTI]

Researchers have applied genetic algorithms (GAs) and other heuristic optimization methods to perform truss optimization in recent years. Although a substantial amount of research has been performed on the optimization of truss member sizes, nodal...

Paik, Sangwook

2006-04-12T23:59:59.000Z

500

Recent advances in surrogate-based optimization  

Science Journals Connector (OSTI)

The evaluation of aerospace designs is synonymous with the use of long running and computationally intensive simulations. This fuels the desire to harness the efficiency of surrogate-based methods in aerospace design optimization. Recent advances in surrogate-based design methodology bring the promise of efficient global optimization closer to reality. We review the present state of the art of constructing surrogate models and their use in optimization strategies. We make extensive use of pictorial examples and, since no method is truly universal, give guidance as to each method's strengths and weaknesses.

Alexander I.J. Forrester; Andy J. Keane

2009-01-01T23:59:59.000Z