Sample records for generation optimization methods

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

    E-Print Network [OSTI]

    Li, Xiaodong

    power industry. A major objective for the coal-fired power generation loading optimization results of the power generation loading optimization based on a coal-fired power plant demonstratesPower Generation Loading Optimization using a Multi-Objective Constraint-Handling Method via PSO

  2. Method and apparatus for optimizing operation of a power generating plant using artificial intelligence techniques

    DOE Patents [OSTI]

    Wroblewski, David (Mentor, OH); Katrompas, Alexander M. (Concord, OH); Parikh, Neel J. (Richmond Heights, OH)

    2009-09-01T23:59:59.000Z

    A method and apparatus for optimizing the operation of a power generating plant using artificial intelligence techniques. One or more decisions D are determined for at least one consecutive time increment, where at least one of the decisions D is associated with a discrete variable for the operation of a power plant device in the power generating plant. In an illustrated embodiment, the power plant device is a soot cleaning device associated with a boiler.

  3. Optimization Online - Dynamic Generation of Scenario Trees

    E-Print Network [OSTI]

    G. Ch. Pflug

    2014-09-03T23:59:59.000Z

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

  4. HOMOTOPY OPTIMIZATION METHODS FOR GLOBAL OPTIMIZATION

    E-Print Network [OSTI]

    O'Leary, Dianne P.

    HOMOTOPY OPTIMIZATION METHODS FOR GLOBAL OPTIMIZATION DANIEL M. DUNLAVY AND DIANNE P. O'LEARY under Grants CCR 02-04084 and CCF 05-14213. 1 #12;2 D.M. DUNLAVY AND D.P. O'LEARY point is generated

  5. Method of grid generation

    DOE Patents [OSTI]

    Barnette, Daniel W. (Veguita, NM)

    2002-01-01T23:59:59.000Z

    The present invention provides a method of grid generation that uses the geometry of the problem space and the governing relations to generate a grid. The method can generate a grid with minimized discretization errors, and with minimal user interaction. The method of the present invention comprises assigning grid cell locations so that, when the governing relations are discretized using the grid, at least some of the discretization errors are substantially zero. Conventional grid generation is driven by the problem space geometry; grid generation according to the present invention is driven by problem space geometry and by governing relations. The present invention accordingly can provide two significant benefits: more efficient and accurate modeling since discretization errors are minimized, and reduced cost grid generation since less human interaction is required.

  6. Optimization Online - Conjugate gradient methods based on secant ...

    E-Print Network [OSTI]

    Y Narushima

    2011-09-28T23:59:59.000Z

    Sep 28, 2011 ... Conjugate gradient methods based on secant conditions that generate descent search directions for unconstrained optimization.

  7. NEWTON'S METHOD FOR MULTIOBJECTIVE OPTIMIZATION ...

    E-Print Network [OSTI]

    The method does not scalarize the original vector optimization problem, ... for an optimization problem with an objective function with a partially ordered vector...

  8. Homotopy optimization methods for global optimization.

    SciTech Connect (OSTI)

    Dunlavy, Daniel M.; O'Leary, Dianne P. (University of Maryland, College Park, MD)

    2005-12-01T23:59:59.000Z

    We define a new method for global optimization, the Homotopy Optimization Method (HOM). This method differs from previous homotopy and continuation methods in that its aim is to find a minimizer for each of a set of values of the homotopy parameter, rather than to follow a path of minimizers. We define a second method, called HOPE, by allowing HOM to follow an ensemble of points obtained by perturbation of previous ones. We relate this new method to standard methods such as simulated annealing and show under what circumstances it is superior. We present results of extensive numerical experiments demonstrating performance of HOM and HOPE.

  9. The optimal prediction method

    E-Print Network [OSTI]

    Burin des Roziers, T.

    2011-01-01T23:59:59.000Z

    Mathematics. In optimal prediction. Communications press,and R. Kupferman. On the prediction of large- scale dynamicsand D. Levy. Optimal prediction and pertur- bation theory.

  10. Toward optimized code generation through model-based optimization

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    Toward optimized code generation through model- based optimization Asma Charfi, Chokri Mraidha.gerard, francois.terrier}@cea.fr Pierre Boulet LIFL, CNRS/INRIA, Université de Lille 1, Parc de la Haute Borne, Bât tools like synthesis of system's application by automatic code generation. Real-Time and Embedded

  11. Distributed Generation Dispatch Optimization under Various Electricity Tariffs

    E-Print Network [OSTI]

    Firestone, Ryan; Marnay, Chris

    2007-01-01T23:59:59.000Z

    LBNL-54447. Distributed Generation Dispatch OptimizationA Business Case for On-Site Generation: The BD Biosciencesrelated work. Distributed Generation Dispatch Optimization

  12. The EXODUS Optimizer Generator Goetz Graefe

    E-Print Network [OSTI]

    Liblit, Ben

    . Algebraic transformation rules are translated into an execut- able query optimizer, which transforms query for an existing operator in the query language. To achieve this, the EXODUS design consists of a powerful, highlyThe EXODUS Optimizer Generator Goetz Graefe David J. DeWitt Computer Sciences Department University

  13. Optimization of Water Consumption in Second Generation Bioethanol Plants

    E-Print Network [OSTI]

    Grossmann, Ignacio E.

    1 Optimization of Water Consumption in Second Generation Bioethanol Plants Mariano Martna optimization of second generation bioethanol production plants from lignocellulosic switchgrass when using

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

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

    Model-Based Transient Calibration Optimization for Next Generation Diesel Engines Model-Based Transient Calibration Optimization for Next Generation Diesel Engines 2005 Diesel...

  15. Research Note on a Parabolic Heat-Balance Integral Method with Unspecified Exponent: An Entropy Generation Approach in Optimal Profile Determination

    E-Print Network [OSTI]

    Jordan Hristov

    2010-12-12T23:59:59.000Z

    The heat-balance integral method of Goodman is studied with two simple 1-D heat conduction problems with prescribed temperature and flux boundary conditions. These classical problems with well known exact solutions enable to demonstrate the heat-balance integral method performance by a parabolic profile and the entropy generation minimization concept in definition of the appropriate profile exponent. The basic assumption generating the additional constraints needed to perform the solution is based on the requirement to minimize the difference in the local thermal entropy generation rates calculated by the approximate and the exact profile, respectively. This concept is easily applicable since the general concept has simple implementation of the condition requiring the thermal entropy generations calculated through both profiles to be the same at the boundary. The entropy minimization generation approach automatically generates the additional requirement which is deficient in the set of conditions defined by the heat-balance integral method concept.

  16. Distributed Generation Dispatch Optimization under Various Electricity Tariffs

    E-Print Network [OSTI]

    Firestone, Ryan; Marnay, Chris

    2007-01-01T23:59:59.000Z

    time of use United States Postal Service v Distributed Generation Dispatch Optimization Under Various Electricity Tariffs

  17. Bismuth generator method

    DOE Patents [OSTI]

    Bray, Lane Allan (Richland, WA); DesChane, Jaquetta R. (Pasco, WA)

    1998-01-01T23:59:59.000Z

    A method for separating .sup.213 Bi from a solution of radionuclides wherein the solution contains a concentration of the chloride ions and hydrogen ions adjusted to allow the formation of a chloride complex. The solution is then brought into contact with an anion exchange resin, whereupon .sup.213 Bi is absorbed from the solution and adhered onto the anion exchange resin in the chloride complex. Other non-absorbing radionuclides such as .sup.225 Ra, .sup.225 Ac, and .sup.221 Fr, along with HCl are removed from the anion exchange resin with a scrub solution. The .sup.213 Bi is removed from the anion exchange resin by washing the anion exchange resin with a stripping solution free of chloride ions and with a reduced hydrogen ion concentration which breaks the chloride anionic complex, releasing the .sup.213 Bi as a cation. In a preferred embodiment of the present invention, the anion exchange resin is provided as a thin membrane, allowing for extremely rapid adherence and stripping of the .sup.213 Bi. A preferred stripping solution for purification of .sup.213 Bi for use in medical applications includes sodium acetate, pH 5.5. A protein conjugated with bifunctional chelating agents in vivo with the NaOAc, to receive the .sup.213 Bi as it is being released from the anion exchange resin.

  18. Optimization Online - Newton's Method for Multiobjective Optimization

    E-Print Network [OSTI]

    Joerg Fliege

    2008-03-01T23:59:59.000Z

    Mar 1, 2008 ... ... is supported by the Mathematical Programming Society and by the Optimization Technology Center. Mathematical Programming Society.

  19. Vapor generation methods for explosives detection research. ...

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

    Vapor generation methods for explosives detection research. Vapor generation methods for explosives detection research. Abstract: The generation of calibrated vapor samples of...

  20. Optimal generation of entanglement under local control

    E-Print Network [OSTI]

    Raffaele Romano; Alessio Del Fabbro

    2007-07-11T23:59:59.000Z

    We study the optimal generation of entanglement between two qubits subject to local unitary control. With the only assumptions of linear control and unitary dynamics, by means of a numerical protocol based on the variational approach (Pontryagin's Minimum Principle), we evaluate the optimal control strategy leading to the maximal achievable entanglement in an arbitrary interaction time, taking into account the energy cost associated to the controls. In our model we can arbitrarily choose the relative weight between a large entanglement and a small energy cost.

  1. A Redistributed Proximal Bundle Method for Nonconvex Optimization

    E-Print Network [OSTI]

    2009-03-31T23:59:59.000Z

    Mar 31, 2009 ... Bundle methods are currently among the most efficient optimization ... CEPEL, Electric Energy Research Center, Rio de Janeiro, Brazil. ..... tions, using data generated by the algorithm, accumulated in a bundle of information.

  2. Utility Solar Generation Valuation Methods

    SciTech Connect (OSTI)

    Hansen, Thomas N.; Dion, Phillip J.

    2009-06-30T23:59:59.000Z

    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.

  3. Projection methods in conic optimization

    E-Print Network [OSTI]

    2011-03-08T23:59:59.000Z

    turn the work-horse of a range of algorithms in conic optimization, having a variety of ... algorithms for linear conic optimization, and applications in polynomial.

  4. Robust Methods for Engineering Design Optimization

    E-Print Network [OSTI]

    Dennis, Brian

    Random Energy Lost Generation Hybrid Example Optimization of turbine cascade (2-D) with hybrid GA for optimized blade Hybrid Algorithms Use a combination of algorithms plus a switching strategy for searching #12;7 Flowchart of automatic switching among modules in a hybrid optimizer Design Variance 0 DFP GA NM

  5. Fast Quantum Methods for Optimization

    E-Print Network [OSTI]

    Sergio Boixo; Gerardo Ortiz; Rolando Somma

    2014-09-08T23:59:59.000Z

    Discrete combinatorial optimization consists in finding the optimal configuration that minimizes a given discrete objective function. An interpretation of such a function as the energy of a classical system allows us to reduce the optimization problem into the preparation of a low-temperature thermal state of the system. Motivated by the quantum annealing method, we present three strategies to prepare the low-temperature state that exploit quantum mechanics in remarkable ways. We focus on implementations without uncontrolled errors induced by the environment. This allows us to rigorously prove a quantum advantage. The first strategy uses a classical-to-quantum mapping, where the equilibrium properties of a classical system in $d$ spatial dimensions can be determined from the ground state properties of a quantum system also in $d$ spatial dimensions. We show how such a ground state can be prepared by means of quantum annealing, including quantum adiabatic evolutions. This mapping also allows us to unveil some fundamental relations between simulated and quantum annealing. The second strategy builds upon the first one and introduces a technique called spectral gap amplification to reduce the time required to prepare the same quantum state adiabatically. If implemented on a quantum device that exploits quantum coherence, this strategy leads to a quadratic improvement in complexity over the well-known bound of the classical simulated annealing method. The third strategy is not purely adiabatic; instead, it exploits diabatic processes between the low-energy states of the corresponding quantum system. For some problems it results in an exponential speedup (in the oracle model) over the best classical algorithms.

  6. OPTIMAL CONTROL APPLICATIONS AND METHODS Optim. Control Appl. Meth. (2008)

    E-Print Network [OSTI]

    Maurer, Helmut

    2008-01-01T23:59:59.000Z

    control of a CSTR reactor; optimal fishing 1. INTRODUCTION Differential control systems with delays in the state variable. Delays in the control are admitted for systems linear in the control variable. ColoniusOPTIMAL CONTROL APPLICATIONS AND METHODS Optim. Control Appl. Meth. (2008) Published online

  7. Fast Methods for Bimolecular Charge Optimization

    E-Print Network [OSTI]

    Bardhan, Jaydeep P.

    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 ...

  8. Derivative Free Optimization Methods for Optimizing Stirrer ...

    E-Print Network [OSTI]

    2007-02-01T23:59:59.000Z

    bDepartment of Mathematics and Institute of Applied Mathematics,. Middle East ... cDepartment of Numerical Methods in Mechanical Engineering,. Darmstadt .... For the computer simulation of fluid inside the stirrer by the CFD package.

  9. Distributed Generation Dispatch Optimization under VariousElectricity Tariffs

    SciTech Connect (OSTI)

    Firestone, Ryan; Marnay, Chris

    2007-05-01T23:59:59.000Z

    The on-site generation of electricity can offer buildingowners and occupiers financial benefits as well as social benefits suchas reduced grid congestion, improved energy efficiency, and reducedgreenhouse gas emissions. Combined heat and power (CHP), or cogeneration,systems make use of the waste heat from the generator for site heatingneeds. Real-time optimal dispatch of CHP systems is difficult todetermine because of complicated electricity tariffs and uncertainty inCHP equipment availability, energy prices, and system loads. Typically,CHP systems use simple heuristic control strategies. This paper describesa method of determining optimal control in real-time and applies it to alight industrial site in San Diego, California, to examine: 1) the addedbenefit of optimal over heuristic controls, 2) the price elasticity ofthe system, and 3) the site-attributable greenhouse gas emissions, allunder three different tariff structures. Results suggest that heuristiccontrols are adequate under the current tariff structure and relativelyhigh electricity prices, capturing 97 percent of the value of thedistributed generation system. Even more value could be captured bysimply not running the CHP system during times of unusually high naturalgas prices. Under hypothetical real-time pricing of electricity,heuristic controls would capture only 70 percent of the value ofdistributed generation.

  10. AUTOMATIC GENERATION OF OPTIMAL CONTROLLERS THROUGH MODEL CHECKING TECHNIQUES

    E-Print Network [OSTI]

    Tronci, Enrico

    AUTOMATIC GENERATION OF OPTIMAL CONTROLLERS THROUGH MODEL CHECKING TECHNIQUES Giuseppe Della Penna Keywords: Controller Synthesis, Controller Optimization, Model Checking, Nonlinear Systems Abstract: We INTRODUCTION Control systems (or, shortly, controllers) are small hardware/software components that control

  11. Cut Generation for Optimization Problems with Multivariate Risk ...

    E-Print Network [OSTI]

    Simge Kkyavuz

    2014-07-26T23:59:59.000Z

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

  12. Hybrid robust predictive optimization method of power system dispatch

    DOE Patents [OSTI]

    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

    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.

  13. Stochastic Co-optimization for Hydro-Electric Power Generation

    E-Print Network [OSTI]

    1 Stochastic Co-optimization for Hydro-Electric Power Generation Shi-Jie Deng, Senior Member, IEEE the optimal scheduling problem faced by a hydro-electric power producer that simultaneously participates in multiple markets. Specifically, the hydro-generator participates in both the electricity spot market

  14. Apparatuses and methods for generating electric fields

    DOE Patents [OSTI]

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

    2013-08-06T23:59:59.000Z

    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.

  15. Method for protecting an electric generator

    DOE Patents [OSTI]

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

    2008-11-18T23:59:59.000Z

    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.

  16. Distributed Generation Dispatch Optimization under Various Electricity Tariffs

    E-Print Network [OSTI]

    Firestone, Ryan; Marnay, Chris

    2007-01-01T23:59:59.000Z

    purchase abs. cooling offset electric supply (kW) hourTariffs electric supply (kW) abs. cooling offset purchasecooling offset Distributed Generation Dispatch Optimization Under Various Electricity Tariffs electric supply (

  17. A new database generation method combining maximin method and kriging prediction for eddy-current testing

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    A new database generation method combining maximin method and kriging prediction for eddy-current@evt.bme.hu Abstract: The accurate numerical simulation of the eddy- current testing (ECT) experiments usually requires-based adaptive methodology which yields to databases optimized to the given problem. Keywords: eddy-current

  18. Optimizing Marshalling by Run-Time Program Generation

    E-Print Network [OSTI]

    Kamin, Sam

    Optimizing Marshalling by Run-Time Program Generation Baris Aktemur1 , Joel Jones2 , Samuel Kamin1. Saving the internal data of an application in an external form is called marshalling. A generic marshaller is difficult to optimize because the format of the data that will be marshalled is unknown

  19. 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...

  20. Method of generating a surface mesh

    DOE Patents [OSTI]

    Shepherd, Jason F. (Albuquerque, NM); Benzley, Steven (Provo, UT); Grover, Benjamin T. (Tracy, CA)

    2008-03-04T23:59:59.000Z

    A method and machine-readable medium provide a technique to generate and modify a quadrilateral finite element surface mesh using dual creation and modification. After generating a dual of a surface (mesh), a predetermined algorithm may be followed to generate and modify a surface mesh of quadrilateral elements. The predetermined algorithm may include the steps of generating two-dimensional cell regions in dual space, determining existing nodes in primal space, generating new nodes in the dual space, and connecting nodes to form the quadrilateral elements (faces) for the generated and modifiable surface mesh.

  1. A method for optimal water quality management

    E-Print Network [OSTI]

    Miller, Daniel Stewart

    1968-01-01T23:59:59.000Z

    that multi- stage optimization is applicablc to thc problem. IIow- cvcr, thoy have oversimplified thc waste tx catmant operation and have nccgloctod thc influcnco of tha reservoir (low-flow augmentation). Low-flow augmentation denotes releases from... . 30 Chapter IV SOLUTION METHODS. Introduction Terminology. Stages and returns. Decision variable Transition function The Principal of Optimality. Fixed State Problems Initial value Final value Two point boundary. Example Problem...

  2. Projected-search methods for box-constrained optimization

    E-Print Network [OSTI]

    Ferry, Michael William

    2011-01-01T23:59:59.000Z

    Search Methods for Unconstrained Optimization 2.1 Newtons3 Active-Set Methods for Box-Constrained Optimization 3.1for Box-Constrained Optimization . 5.1 Converting to a

  3. Optimization of infrared two-color multicycle field synthesis for intense-isolated-attosecond-pulse generation

    SciTech Connect (OSTI)

    Lan Pengfei; Takahashi, Eiji J.; Midorikawa, Katsumi [Extreme Photonics Research Group, RIKEN Advanced Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan)

    2010-11-15T23:59:59.000Z

    We present the optimization of the two-color synthesis method for generating an intense isolated attosecond pulse (IAP) in the multicycle regime. By mixing an infrared assistant pulse with a Ti:sapphire main pulse, we show that an IAP can be produced using a multicycle two-color pulse with a duration longer than 30 fs. We also discuss the influence of the carrier-envelope phase (CEP) and the relative intensity on the generation of IAPs. By optimizing the wavelength of the assistant field, IAP generation becomes insensitive to the CEP slip. Therefore, the optimized two-color method enables us to relax the requirements of pulse duration and easily produce the IAP with a conventional multicycle laser pulse. In addition, it enables us to markedly suppress the ionization of the harmonic medium. This is a major advantage for efficiently generating intense IAPs from a neutral medium by applying the appropriate phase-matching and energy-scaling techniques.

  4. Probabilistic Methods in Combinatorial and Stochastic Optimization

    E-Print Network [OSTI]

    Vondrak, Jan

    problem that we investigate is the minimum spanning tree. Our essential result regarding this problem is that for every graph with edge weights, there is a set of O(n log n) edges which contains the minimum spanningProbabilistic Methods in Combinatorial and Stochastic Optimization by Jan Vondr´ak Submitted

  5. Optimal worm-scanning method using

    E-Print Network [OSTI]

    Ji, Chuanyi

    Optimal worm-scanning method using vulnerable-host distributions Zesheng Chen and Chuanyi Ji School}@ece.gatech.edu Abstract: Most Internet worms use random scanning. The distribution of vulnerable hosts on the Internet, however, is highly non-uniform over the IP-address space. This implies that random scanning wastes many

  6. Power generation method including membrane separation

    DOE Patents [OSTI]

    Lokhandwala, Kaaeid A. (Union City, CA)

    2000-01-01T23:59:59.000Z

    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.

  7. Optimization Online - Preconditioning of Active-Set Newton Methods ...

    E-Print Network [OSTI]

    Margherita Porcelli

    2014-08-16T23:59:59.000Z

    Aug 16, 2014 ... ... of Active-Set Newton Methods for PDE-constrained Optimal Control ... point linear systems arising in the solution of PDE-constrained optimal...

  8. Efficient idempotent methods for optimal control

    E-Print Network [OSTI]

    Deshpande, Ameet Shridhar

    2009-01-01T23:59:59.000Z

    an optimal control problem for switched linear systems. Letan optimal control problem for a switched linear system. Foran optimal control problem for a switched linear system. For

  9. Methods for PDE-constrained optimization

    E-Print Network [OSTI]

    Reed, Joseph Robert

    2011-01-01T23:59:59.000Z

    constrained optimization . . . . . . . . . . . . . . . 1.4.16.5 Testing the optimization algorithm . . . . . . .6.5.1 The optimization algorithm in PLTMG 6.6 The proposed

  10. Optimal Fusion Transformations for Linear Optical Cluster State Generation

    E-Print Network [OSTI]

    D. B. Uskov; P. Lougovski; P. M. Alsing; M. L. Fanto; L. Kaplan; A. M. Smith

    2014-07-22T23:59:59.000Z

    We analyze the generation of linear optical cluster states (LOCS) via addition of one and two qubits. Existing approaches employ the stochastic linear optical two-qubit CZ gate with success rate of 1/9 per fusion operation. The question of optimality of the CZ gate with respect to LOCS generation remains open. We report that there are alternative schemes to the CZ gate that are exponentially more efficient and show that sequential LOCS growth is globally optimal. We find that the optimal cluster growth operation is a state transformation on a subspace of the full Hilbert space. We show that the maximal success rate of fusing n photonic qubits or m Bell pairs is 1/2^n-1 and 1/4^m-1 respectively and give an explicit optical design.

  11. Method of operating a thermoelectric generator

    DOE Patents [OSTI]

    Reynolds, Michael G; Cowgill, Joshua D

    2013-11-05T23:59:59.000Z

    A method for operating a thermoelectric generator supplying a variable-load component includes commanding the variable-load component to operate at a first output and determining a first load current and a first load voltage to the variable-load component while operating at the commanded first output. The method also includes commanding the variable-load component to operate at a second output and determining a second load current and a second load voltage to the variable-load component while operating at the commanded second output. The method includes calculating a maximum power output of the thermoelectric generator from the determined first load current and voltage and the determined second load current and voltage, and commanding the variable-load component to operate at a third output. The commanded third output is configured to draw the calculated maximum power output from the thermoelectric generator.

  12. Plasma plume MHD power generator and method

    DOE Patents [OSTI]

    Hammer, J.H.

    1993-08-10T23:59:59.000Z

    A method is described of generating power at a situs exposed to the solar wind which comprises creating at separate sources at the situs discrete plasma plumes extending in opposed directions, providing electrical communication between the plumes at their source and interposing a desired electrical load in the said electrical communication between the plumes.

  13. Simplex Method Math 364: Principles of Optimization, Lecture 7

    E-Print Network [OSTI]

    Li, Haijun

    Simplex Method Math 364: Principles of Optimization, Lecture 7 Haijun Li lih of Optimization, Lecture 7 Spring 2012 1 / 20 #12;Simplex Method Standard Form Haijun Li Math 364: Principles of Optimization, Lecture 7 Spring 2012 2 / 20 #12;Simplex Method Figure: Two consecutive shifts and constraints

  14. Optimal Control for Generating Quantum Gates in Open Dissipative Systems

    E-Print Network [OSTI]

    T. Schulte-Herbrueggen; A. Spoerl; N. Khaneja; S. J. Glaser

    2009-05-17T23:59:59.000Z

    Optimal control methods for implementing quantum modules with least amount of relaxative loss are devised to give best approximations to unitary gates under relaxation. The potential gain by optimal control using relaxation parameters against time-optimal control is explored and exemplified in numerical and in algebraic terms: it is the method of choice to govern quantum systems within subspaces of weak relaxation whenever the drift Hamiltonian would otherwise drive the system through fast decaying modes. In a standard model system generalising decoherence-free subspaces to more realistic scenarios, openGRAPE-derived controls realise a CNOT with fidelities beyond 95% instead of at most 15% for a standard Trotter expansion. As additional benefit it requires control fields orders of magnitude lower than the bang-bang decouplings in the latter.

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

    DOE Patents [OSTI]

    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

    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.

  16. Optimal command generation for maneuvering the space station

    E-Print Network [OSTI]

    Bryson, Amy Louise

    2001-01-01T23:59:59.000Z

    The objective of this research is to obtain near minimum-fuel and minimum-time maneuver commands for large-angle maneuvers for the international space station. Attitude and angular velocity waypoints are generated using the method of differential...

  17. Electrical motor/generator drive apparatus and method

    DOE Patents [OSTI]

    Su, Gui Jia

    2013-02-12T23:59:59.000Z

    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.

  18. Method for generating a plasma wave to accelerate electrons

    DOE Patents [OSTI]

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

    1997-01-01T23:59:59.000Z

    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.

  19. Method for generating a plasma wave to accelerate electrons

    DOE Patents [OSTI]

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

    1997-06-10T23:59:59.000Z

    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.

  20. LEAST-SQUARES FINITE ELEMENT METHODS FOR OPTIMALITY SYSTEMS ARISING

    E-Print Network [OSTI]

    Bochev, Pavel

    LEAST-SQUARES FINITE ELEMENT METHODS FOR OPTIMALITY SYSTEMS ARISING IN OPTIMIZATION AND CONTROL control problems for systems governed by linear, elliptic partial differential equations is considered modern least-squares finite element methods for the solution of the optimality systems. The matrix equa

  1. Optimization Online - An MILP-MINLP decomposition method for the ...

    E-Print Network [OSTI]

    Irene Lotero

    2015-04-14T23:59:59.000Z

    Apr 14, 2015 ... An MILP-MINLP decomposition method for the global optimization of a source based model of the multiperiod ... Citation: Submitted for Publication to Computers and Chemical Engineering ... Mathematical Optimization Society.

  2. Plasma generators, reactor systems and related methods

    DOE Patents [OSTI]

    Kong, Peter C. (Idaho Falls, ID); Pink, Robert J. (Pocatello, ID); Lee, James E. (Idaho Falls, ID)

    2007-06-19T23:59:59.000Z

    A plasma generator, reactor and associated systems and methods are provided in accordance with the present invention. A plasma reactor may include multiple sections or modules which are removably coupled together to form a chamber. Associated with each section is an electrode set including three electrodes with each electrode being coupled to a single phase of a three-phase alternating current (AC) power supply. The electrodes are disposed about a longitudinal centerline of the chamber and are arranged to provide and extended arc and generate an extended body of plasma. The electrodes are displaceable relative to the longitudinal centerline of the chamber. A control system may be utilized so as to automatically displace the electrodes and define an electrode gap responsive to measure voltage or current levels of the associated power supply.

  3. Optimization of auxiliary power systems design for large generating units

    SciTech Connect (OSTI)

    Fabri, E.I.; Kang, E.K.; Dusterdick, R.W.

    1980-01-01T23:59:59.000Z

    Modern fossil and nuclear generating units require the support of a fairly large and complex electric auxiliary power system. The selection of an optimized and cost-effective auxiliary power transformer rating may be a difficult process, since the loading profile and coincident operation of the loads often cannot be firmly defined at an early stage of design. The authors believe that this important design process could be greatly aided by systematic field tests and recording of the actual auxiliary loading profiles during various modes of plant operations.

  4. Cavity-enhanced second harmonic generation via nonlinear-overlap optimization

    E-Print Network [OSTI]

    Lin, Zin; Loncar, Marko; Johnson, Steven G; Rodriguez, Alejandro W

    2015-01-01T23:59:59.000Z

    We describe an approach based on topology optimization that enables automatic discovery of wavelength-scale photonic structures for achieving high-efficiency second-harmonic generation (SHG). A key distinction from previous formulation and designs that seek to maximize Purcell factors at individual frequencies is that our method not only aims to achieve frequency matching (across an entire octave) and large radiative lifetimes, but also optimizes the equally important nonlinear--coupling figure of merit $\\bar{\\beta}$, involving a complicated spatial overlap-integral between modes. We apply this method to the particular problem of optimizing micropost and grating-slab cavities (one-dimensional multilayered structures) and demonstrate that a variety of material platforms can support modes with the requisite frequencies, large lifetimes $Q \\gtrsim 10^3$, small modal volumes $\\sim (\\lambda/n)^3$, and extremely large $\\bar{\\beta} \\gtrsim 10^{-2}$, orders of magnitude larger than the state of the art.

  5. Method for generating hydrogen for fuel cells

    DOE Patents [OSTI]

    Ahmed, Shabbir; Lee, Sheldon H. D.; Carter, John David; Krumpelt, Michael

    2004-03-30T23:59:59.000Z

    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.

  6. Method for nonlinear optimization for gas tagging and other systems

    DOE Patents [OSTI]

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

    1998-01-06T23:59:59.000Z

    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.

  7. Method for nonlinear optimization for gas tagging and other systems

    DOE Patents [OSTI]

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

    1998-01-01T23:59:59.000Z

    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.

  8. Distributed Generation Dispatch Optimization under Various Electricity Tariffs

    E-Print Network [OSTI]

    Firestone, Ryan; Marnay, Chris

    2007-01-01T23:59:59.000Z

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

  9. Optimal Solar PV Arrays Integration for Distributed Generation

    SciTech Connect (OSTI)

    Omitaomu, Olufemi A [ORNL; Li, Xueping [University of Tennessee, Knoxville (UTK)

    2012-01-01T23:59:59.000Z

    Solar photovoltaic (PV) systems hold great potential for distributed energy generation by installing PV panels on rooftops of residential and commercial buildings. Yet challenges arise along with the variability and non-dispatchability of the PV systems that affect the stability of the grid and the economics of the PV system. This paper investigates the integration of PV arrays for distributed generation applications by identifying a combination of buildings that will maximize solar energy output and minimize system variability. Particularly, we propose mean-variance optimization models to choose suitable rooftops for PV integration based on Markowitz mean-variance portfolio selection model. We further introduce quantity and cardinality constraints to result in a mixed integer quadratic programming problem. Case studies based on real data are presented. An efficient frontier is obtained for sample data that allows decision makers to choose a desired solar energy generation level with a comfortable variability tolerance level. Sensitivity analysis is conducted to show the tradeoffs between solar PV energy generation potential and variability.

  10. 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

  11. Optimization Online - Global convergence of splitting methods for ...

    E-Print Network [OSTI]

    Guoyin Li

    2014-07-02T23:59:59.000Z

    Jul 2, 2014 ... ... and machine learning. In this paper, we examined two types of splitting methods for solving this nonconvex optimization problem: alternating...

  12. Optimization Online - A three-term conjugate gradient method with ...

    E-Print Network [OSTI]

    Y Narushima

    2009-12-03T23:59:59.000Z

    Dec 3, 2009 ... A three-term conjugate gradient method with sufficient descent property for unconstrained optimization. Y Narushima(narusima ***at***...

  13. Method and apparatus for generating acoustic energy

    DOE Patents [OSTI]

    Guerrero, Hector N. (Evans, GA)

    2002-01-01T23:59:59.000Z

    A method and apparatus for generating and emitting amplified coherent acoustic energy. A cylindrical transducer is mounted within a housing, the transducer having an acoustically open end and an acoustically closed end. The interior of the transducer is filled with an active medium which may include scattering nuclei. Excitation of the transducer produces radially directed acoustic energy in the active medium, which is converted by the dimensions of the transducer, the acoustically closed end thereof, and the scattering nuclei, to amplified coherent acoustic energy directed longitudinally within the transducer. The energy is emitted through the acoustically open end of the transducer. The emitted energy can be used for, among other things, effecting a chemical reaction or removing scale from the interior walls of containment vessels.

  14. Linear optimization Linear programming using the Simplex method

    E-Print Network [OSTI]

    McCready, Mark J.

    Linear optimization Linear programming using the Simplex method Maximize M = 40 x1 + 60 x2 subject, that increasing x2 is the way to get the biggest impact. The idea of the simplex method is to move only

  15. Exact Methods In Fractional Combinatorial Optimization

    E-Print Network [OSTI]

    Ursulenko, Oleksii

    2011-02-22T23:59:59.000Z

    -to-time ratio cycle problem, also known as the tramp steamer problem [2]. A short survey on fractional combinatorial optimization problems and related solution approaches can be found in [35]. Recently, Skiscim and Palocsay [39, 40] have introduced a..., approximability and local search, are addressed in [32, 33]. Generally speaking, multiple-ratio problems arise in case of multiple fractional performance metrics that need to be optimized, e.g., a eet of cargo ships in the tramp steamer problem. Related...

  16. Distributed Generation Dispatch Optimization under Various Electricity Tariffs

    E-Print Network [OSTI]

    Firestone, Ryan; Marnay, Chris

    2007-01-01T23:59:59.000Z

    Optimization Common DG devices are reciprocating engines, gas turbines, microturbines, and fuel cells.

  17. MULTI-START METHODS FOR COMBINATORIAL OPTIMIZATION

    E-Print Network [OSTI]

    Resende, Mauricio G. C.

    not used to address problems in the realm of optimization as we view it today. More recently, Glover (1977 #12;2 RAFAEL MART´I, MAURICIO G.C. RESENDE, AND CELSO C. RIBEIRO framework are given in Glover (1986), Glover (1989), and Glover (2000), addressing controlled randomization, learning strategies, induced

  18. Demonstration of an availability optimization method

    SciTech Connect (OSTI)

    Unkle, C.R.; Hall, S.C. (Arinc Research Corp., Annapolis, MD (USA))

    1989-02-01T23:59:59.000Z

    This report presents the results of applying an availability cost optimization methodology at Potomac Electric Power Company (PEPCO). This methodology, developed under EPRI contract RP2462-1 by ARINC Research Corporation, uses the UNIRAM availability assessment methodology with an optimization routine that addresses the dependencies and possible non-linearities encountered when evaluating candidate availability improvements of power plants. The demonstration analysis was performed in conjunction with a ten-year life extension study being conducted by PEPCO. The analysis resulted in defining an optimized order of selection for those components recommended for improvement in each of the ten years of the improvement program, and included the estimated cost/benefit ratio of each recommended change. The results of the demonstration indicated that the effect of multiple component improvements on the unit level availability is non-linear, and that the order in which improvements are made is important to optimization when changes must be justified individually on a cost/benefit basis or if the final number of improvements to be implemented is subject to change. 3 figs., 22 tabs.

  19. Methods for PDE-constrained optimization

    E-Print Network [OSTI]

    Reed, Joseph Robert

    2011-01-01T23:59:59.000Z

    3.3.1 Conjugate-gradient method . . . . . . . . . . .3.3.2 The preconditioned conjugate-gradient method 3.3.3The Lanczos conjugate-gradient method . . . . 3.4 The

  20. A Method for Generating Phyllotaxis over Surfaces of Revolution

    E-Print Network [OSTI]

    McCormack, Jon

    Lindenmayer systems (L-systems) to model phyllotaxis in plants for the purposes of generat- ing realistic. Example images of plants, generated using this model, are also il- lustrated. #12;2 A MethodA Method for Generating Phyllotaxis over Surfaces of Revolution Jon McCormack Centre for Electronic

  1. Hybrid method for aerodynamic shape optimization in automotive industry

    E-Print Network [OSTI]

    Dumas, Laurent

    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 precisely the reduction of their drag coefficient, becomes one of the main topics of the automotive research

  2. Switching Mode Generation and Optimal Estimation with Application to Skid-Steering

    E-Print Network [OSTI]

    Hartmann, Mitra J. Z.

    to treat the skid-steered vehicle as a switched system, the vehicle's ground interaction is modeled using; optimal estimation; optimal control; estimation algorithms 1 Introduction The skid-steered vehicle (SSVSwitching Mode Generation and Optimal Estimation with Application to Skid-Steering T. M. Caldwell

  3. Optimization of sequential attractor-based movement for compact behaviour generation

    E-Print Network [OSTI]

    Toussaint, Marc

    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

  4. An Improved Lagrangian Relaxation Method for VLSI Combinational Circuit Optimization

    E-Print Network [OSTI]

    Huang, Yi-Le

    2012-02-14T23:59:59.000Z

    Gate sizing and threshold voltage (Vt) assignment are very popular and useful techniques in current very large scale integration (VLSI) design flow for timing and power optimization. Lagrangian relaxation (LR) is a common method for handling multi...

  5. Centrifugal compressor return channel shape optimization using adjoint method

    E-Print Network [OSTI]

    Guo, Wei, S.M. Massachusetts Institute of Technology

    2013-01-01T23:59:59.000Z

    This thesis describes the construction of an automated gradient-based optimization process using the adjoint method and its application to centrifugal compressor return channel loss reduction. A proper objective function ...

  6. Optimal and Robust Saturated Control for a Clock Generator C. Albea S. Lesecq and D. Puschini

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    ,i] [7]. If the clock is generated for the whole circuit, and distributed in each VFI, the maximumOptimal and Robust Saturated Control for a Clock Generator C. Albea S. Lesecq and D. Puschini control engines in each volt- age/frequency island must be taken into account to optimize the circuit

  7. OPTIMAL CONTROL APPLICATIONS AND METHODS Optim. Control Appl. Meth., 2004; 25:165180

    E-Print Network [OSTI]

    Singh, Tarunraj

    . KEY WORDS: linear programming; friction; vibratory system; pulse width control 1. INTRODUCTION term added to the input force. With this constraint, optimal control design techniques for linear systems can be used for systems with friction. One method to find a time optimal control profile is input

  8. A Parallel Inertial Proximal Optimization Method

    E-Print Network [OSTI]

    2011-07-01T23:59:59.000Z

    The Douglas-Rachford algorithm is a popular iterative method for finding a zero of a ... algorithm, parallel proximal algorithms are proposed to minimize over a...

  9. Distributed Generation Dispatch Optimization under Various Electricity Tariffs

    E-Print Network [OSTI]

    Firestone, Ryan; Marnay, Chris

    2007-01-01T23:59:59.000Z

    utility experience with RTP tariffs is described in 3. Distributed GenerationUtilities Commission, Division of Ratepayer Advocates have also provided support on related work. Distributed Generation

  10. Method for Determining Optimal Residential Energy Efficiency Retrofit Packages

    SciTech Connect (OSTI)

    Polly, B.; Gestwick, M.; Bianchi, M.; Anderson, R.; Horowitz, S.; Christensen, C.; Judkoff, R.

    2011-04-01T23:59:59.000Z

    Businesses, government agencies, consumers, policy makers, and utilities currently have limited access to occupant-, building-, and location-specific recommendations for optimal energy retrofit packages, as defined by estimated costs and energy savings. This report describes an analysis method for determining optimal residential energy efficiency retrofit packages and, as an illustrative example, applies the analysis method to a 1960s-era home in eight U.S. cities covering a range of International Energy Conservation Code (IECC) climate regions. The method uses an optimization scheme that considers average energy use (determined from building energy simulations) and equivalent annual cost to recommend optimal retrofit packages specific to the building, occupants, and location. Energy savings and incremental costs are calculated relative to a minimum upgrade reference scenario, which accounts for efficiency upgrades that would occur in the absence of a retrofit because of equipment wear-out and replacement with current minimum standards.

  11. Distributed Generation Dispatch Optimization under Various Electricity Tariffs

    E-Print Network [OSTI]

    Firestone, Ryan; Marnay, Chris

    2007-01-01T23:59:59.000Z

    the Optimization of Cogeneration Dispatch in a Deregulatedheat and power (CHP), or cogeneration, systems make use ofheat and power (CHP), or cogeneration, systems make use of

  12. Plasma plume MHD power generator and method

    DOE Patents [OSTI]

    Hammer, James H. (Livermore, CA)

    1993-01-01T23:59:59.000Z

    Highly-conducting plasma plumes are ejected across the interplanetary magnetic field from a situs that is moving relative to the solar wind, such as a spacecraft or an astral body, such as the moon, having no magnetosphere that excludes the solar wind. Discrete plasma plumes are generated by plasma guns at the situs extending in opposite directions to one another and at an angle, preferably orthogonal, to the magnetic field direction of the solar wind plasma. The opposed plumes are separately electrically connected to their source by a low impedance connection. The relative movement between the plasma plumes and the solar wind plasma creates a voltage drop across the plumes which is tapped by placing the desired electrical load between the electrical connections of the plumes to their sources. A portion of the energy produced may be used in generating the plasma plumes for sustained operation.

  13. A simple method for generating rational triangles

    E-Print Network [OSTI]

    Konstantine Zelator

    2008-07-07T23:59:59.000Z

    In the early part of the paper, various geometrical formulas are derived. Then, at some point in the paper, the concept of a Pythagorean rational is introduced. A Pythagorean rational is a rational number which is the ratio of two integers which are the leglengths of a Pythagorean triangle. Using the idea of Pythagorean rationals, we generate two families of rational triangles. We define a rational triangle to be a triangle with rational sidelengths and area.

  14. An Interior Proximal Method in Vector Optimization

    E-Print Network [OSTI]

    2009-08-13T23:59:59.000Z

    sensing conditon that allows us to construct an interior proximal method for ... Department of Systems Engineering and Computer Sciences, COPPE, Federal University of Rio de ...... Mathematics of Operations Research 1992, 17, 3, 670-

  15. A FEASIBLE METHOD FOR OPTIMIZATION WITH ...

    E-Print Network [OSTI]

    2010-11-15T23:59:59.000Z

    Nov 7, 2010 ... to many local minimizers and, in particular, several of these problems in special forms ...... Our numerical experience in [23] of minimizing the p-harmonic flow energy ... monotone line search method based on a strategy in [61].

  16. Adaptive Augmented Lagrangian Methods - Optimization Online

    E-Print Network [OSTI]

    2014-08-19T23:59:59.000Z

    Augmented Lagrangian (AL) methods [25, 33] have recently regained popularity ...... 4176. [22] N.I.M. Gould, D. Orban, and Ph.L. Toint, CUTEr and sifdec: A...

  17. Falcon: automated optimization method for arbitrary assessment criteria

    DOE Patents [OSTI]

    Yang, Tser-Yuan (Livermore, CA); Moses, Edward I. (Livermore, CA); Hartmann-Siantar, Christine (Livermore, CA)

    2001-01-01T23:59:59.000Z

    FALCON is a method for automatic multivariable optimization for arbitrary assessment criteria that can be applied to numerous fields where outcome simulation is combined with optimization and assessment criteria. A specific implementation of FALCON is for automatic radiation therapy treatment planning. In this application, FALCON implements dose calculations into the planning process and optimizes available beam delivery modifier parameters to determine the treatment plan that best meets clinical decision-making criteria. FALCON is described in the context of the optimization of external-beam radiation therapy and intensity modulated radiation therapy (IMRT), but the concepts could also be applied to internal (brachytherapy) radiotherapy. The radiation beams could consist of photons or any charged or uncharged particles. The concept of optimizing source distributions can be applied to complex radiography (e.g. flash x-ray or proton) to improve the imaging capabilities of facilities proposed for science-based stockpile stewardship.

  18. Method and system for radioisotope generation

    DOE Patents [OSTI]

    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

    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.

  19. 1052 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 25, NO. 2, MAY 2010 Co-Optimization of Generation Unit Commitment

    E-Print Network [OSTI]

    Oren, Shmuel S.

    into electric network optimization models. Optimal transmission switching is a straight- forward way to leverage economics, power system reliability, power transmission control, power transmission economics. NOMENCLATURE. Generator. Set of generators at node . Transmission element (line or transformer). Set of transmission

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

    DOE Patents [OSTI]

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

    2001-01-01T23:59:59.000Z

    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.

  1. Genetic algorithm applied to the optimization of quantum cascade lasers with second harmonic generation

    SciTech Connect (OSTI)

    Gaji?, A. [School of Electrical Engineering, University of Belgrade, Bulevar kralja Aleksandra 73, 11120 Belgrade (Serbia); Telekom Srbija, a.d., Takovska 2, 11000 Belgrade (Serbia); Radovanovi?, J., E-mail: radovanovic@etf.bg.ac.rs; Milanovi?, V. [School of Electrical Engineering, University of Belgrade, Bulevar kralja Aleksandra 73, 11120 Belgrade (Serbia); Indjin, D.; Ikoni?, Z. [School of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT (United Kingdom)

    2014-02-07T23:59:59.000Z

    A computational model for the optimization of the second order optical nonlinearities in GaInAs/AlInAs quantum cascade laser structures is presented. The set of structure parameters that lead to improved device performance was obtained through the implementation of the Genetic Algorithm. In the following step, the linear and second harmonic generation power were calculated by self-consistently solving the system of rate equations for carriers and photons. This rate equation system included both stimulated and simultaneous double photon absorption processes that occur between the levels relevant for second harmonic generation, and material-dependent effective mass, as well as band nonparabolicity, were taken into account. The developed method is general, in the sense that it can be applied to any higher order effect, which requires the photon density equation to be included. Specifically, we have addressed the optimization of the active region of a double quantum well In{sub 0.53}Ga{sub 0.47}As/Al{sub 0.48}In{sub 0.52}As structure and presented its output characteristics.

  2. Method and system for SCR optimization

    DOE Patents [OSTI]

    Lefebvre, Wesley Curt (Boston, MA); Kohn, Daniel W. (Cambridge, MA)

    2009-03-10T23:59:59.000Z

    Methods and systems are provided for controlling SCR performance in a boiler. The boiler includes one or more generally cross sectional areas. Each cross sectional area can be characterized by one or more profiles of one or more conditions affecting SCR performance and be associated with one or more adjustable desired profiles of the one or more conditions during the operation of the boiler. The performance of the boiler can be characterized by boiler performance parameters. A system in accordance with one or more embodiments of the invention can include a controller input for receiving a performance goal for the boiler corresponding to at least one of the boiler performance parameters and for receiving data values corresponding to boiler control variables and to the boiler performance parameters. The boiler control variables include one or more current profiles of the one or more conditions. The system also includes a system model that relates one or more profiles of the one or more conditions in the boiler to the boiler performance parameters. The system also includes an indirect controller that determines one or more desired profiles of the one or more conditions to satisfy the performance goal for the boiler. The indirect controller uses the system model, the received data values and the received performance goal to determine the one or more desired profiles of the one or more conditions. The system model also includes a controller output that outputs the one or more desired profiles of the one or more conditions.

  3. Fossil fuel combined cycle power generation method

    DOE Patents [OSTI]

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

    2008-10-21T23:59:59.000Z

    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.

  4. Optimization Online - PSMG-A Parallel Structured Model Generator ...

    E-Print Network [OSTI]

    Feng Qiang

    2014-10-10T23:59:59.000Z

    Oct 10, 2014 ... As far as we are aware, PSMG is the first processor for an algebraic modelling language that is capable of generating the problem in parallel.

  5. Stochastic Programming and its Application to Optimal Generation Planning Stochastic Programming and its

    E-Print Network [OSTI]

    McCalley, James D.

    to Optimal Generation Planning 4 0 10 20 30 40 50 60 70 80 90 100 0 10 20 30 40 50 60 70 80 90 100 Xraw1 Xraw

  6. Design, integration schemes, and optimization of conventional and pressurized oxy-coal power generation processes

    E-Print Network [OSTI]

    Zebian, Hussam

    2014-01-01T23:59:59.000Z

    Efficient and clean electricity generation is a major challenge for today's world. Multivariable optimization is shown to be essential in unveiling the true potential and the high efficiency of pressurized oxy-coal combustion ...

  7. Optimization of a Small Passive Wind Turbine Generator with Multiobjective Genetic Algorithms

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    : Multiobjective Optimization, Genetic Algorithms, Wind Energy, Vertical Axis Wind Turbine hal-00763673,version1 #12;2.2. The Wind Turbine Characteristics A Savonius Vertical Axis Wind Turbine of radius R = 0.5 mOptimization of a Small Passive Wind Turbine Generator with Multiobjective Genetic Algorithms A

  8. Stresa, Italy, 26-28 April 2006 OPTIMIZATION OF PIEZOELECTRIC ELECTRICAL GENERATORS

    E-Print Network [OSTI]

    Boyer, Edmond

    Stresa, Italy, 26-28 April 2006 OPTIMIZATION OF PIEZOELECTRIC ELECTRICAL GENERATORS POWERED the PEG output power [2,3]. Although the power electronic interface used for optimization induces Villeurbanne Cedex, France ABSTRACT This paper compares the performances of a vibration- powered electrical

  9. OPTIMAL DISTRIBUTED POWER GENERATION UNDER NETWORK LOAD CONSTRAINTS,

    E-Print Network [OSTI]

    Frank, Jason

    of novel components for decentral power generation (solar panels, small wind turbines and heat pumps). This gives rise to the question how many units of each type (solar panel, small wind turbine or central-producers. Decentralized Power Generation (DPG) refers to an electric power source such as solar, wind or combined heat

  10. Biological optimization systems for enhancing photosynthetic efficiency and methods of use

    DOE Patents [OSTI]

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

    2014-02-25T23:59:59.000Z

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

  11. A Method for Evaluating Volt-VAR Optimization Field Demonstrations

    SciTech Connect (OSTI)

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

    2014-08-31T23:59:59.000Z

    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.

  12. Scanning the Issue Special Issue on Program Generation, Optimization, and

    E-Print Network [OSTI]

    Dongarra, Jack

    the development of high-performance libraries and applications for engineers and scientists. The fast evolution an intense and sustained ef- fort--which can stretch over a period of weeks or months, if not years, development, and optimization of high-performance software libraries and applications. The special issue

  13. Optimization Methods in Direct and Inverse Alexander G. Ramm1

    E-Print Network [OSTI]

    Optimization Methods in Direct and Inverse Scattering Alexander G. Ramm1 and Semion Gutman2 1- mization problem, and solved by the Hybrid Stochastic-Deterministic minimization algorithm. A similar for the case of spherically symmetric potentials and fixed-energy phase shifts as the scattering data

  14. A Surface Reconstruction Method Using Global Graph Cut Optimization

    E-Print Network [OSTI]

    Paris, Sylvain

    SAR (China) 1 sparis@csail.mit.edu -- Sylvain Paris has worked on this project during his PhD at ARTIS calibrated images mainly has been approached using local methods, either as a continuous optimization problem of a pixel. Index Terms Graph flow, graph cut, 3D reconstruction from calibrated cameras, discontinuities

  15. A Surface Reconstruction Method Using Global Graph Cut Optimization

    E-Print Network [OSTI]

    Paris, Sylvain

    SAR (China) 1sparis@csail.mit.edu ­ Sylvain Paris has worked on this project during his PhD at ARTIS calibrated images mainly has been approached using local methods, either as a continuous optimization problem of a pixel. Index Terms Graph flow, graph cut, 3D reconstruction from calibrated cameras, discontinuities

  16. A Comparison of Derivative-Free Optimization Methods for Groundwater

    E-Print Network [OSTI]

    Kelley, C. T. "Tim"

    A Comparison of Derivative-Free Optimization Methods for Groundwater Supply and Hydraulic Capture, 244 Wood Street, Lexington, MA 02420-9108 USA Abstract Management decisions involving groundwater-documented community problems are used for illustration purposes: a groundwater supply problem and a hydraulic capture

  17. activity optimization method: Topics by E-print Network

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

    activity optimization method First Page Previous Page 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Next Page Last Page Topic Index 1 Regularized Active-Set and...

  18. Municipal Solid Waste Generation: Feasibility of Reconciling Measurement Methods

    E-Print Network [OSTI]

    Schneider, Shelly H.

    2014-07-25T23:59:59.000Z

    to be measured. This research investigates the reconciliation of results from two methodologies for estimating municipal solid waste (MSW) generation, and assessing the potential for solid waste planners to combine the two methods in a cost-effective manner...

  19. Computational Research Challenges and Opportunities for the Optimization of Fossil Energy Power Generation System

    SciTech Connect (OSTI)

    Zitney, S.E.

    2007-06-01T23:59:59.000Z

    Emerging fossil energy power generation systems must operate with unprecedented efficiency and near-zero emissions, while optimizing profitably amid cost fluctuations for raw materials, finished products, and energy. To help address these challenges, the fossil energy industry will have to rely increasingly on the use advanced computational tools for modeling and simulating complex process systems. In this paper, we present the computational research challenges and opportunities for the optimization of fossil energy power generation systems across the plant lifecycle from process synthesis and design to plant operations. We also look beyond the plant gates to discuss research challenges and opportunities for enterprise-wide optimization, including planning, scheduling, and supply chain technologies.

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

    E-Print Network [OSTI]

    Ibrahim Muter

    2010-11-14T23:59:59.000Z

    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...

  1. Generating optimal states for a homodyne Bell test

    E-Print Network [OSTI]

    Sonja Daffer; Peter L. Knight

    2005-04-12T23:59:59.000Z

    We present a protocol that produces a conditionally prepared state that can be used for a Bell test based on homodyne detection. Based on the results of Munro [PRA 1999], the state is near-optimal for Bell-inequality violations based on quadrature-phase homodyne measurements that use correlated photon-number states. The scheme utilizes the Gaussian entanglement distillation protocol of Eisert et. al. [Annals of Phys. 2004] and uses only beam splitters and photodetection to conditionally prepare a non-Gaussian state from a source of two-mode squeezed states with low squeezing parameter, permitting a loophole-free test of Bell inequalities.

  2. Optimized Hydrogen and Electricity Generation from Wind | Department of

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels DataDepartment of Energy Your Density Isn'tOrigin of Contamination in ManyDepartment ofOil'sEnergy8 * October 2006 Optimize

  3. MULTIOBJECTIVE OPTIMAL DESIGN OF SUPERCONDUCTING GENERATOR USING GENETIC ALGORITHM

    E-Print Network [OSTI]

    Coello, Carlos A. Coello

    Project(Super-GM) and successfully completed to verify electrical features in an electric power system, Itsuya Muta, Tsutomu Hoshino and Taketsune Nakamura Department of Electrical Engineering, Graduate School in this paper. In consideration of electrical and mechanical characteristics of superconducting generator

  4. Optimal distributed power generation under network load constraints

    E-Print Network [OSTI]

    Utrecht, Universiteit

    wind turbines and heat pumps). This gives rise to the question how many units of each type (solar panel, mainly because of the development of novel components for decentral power generation (solar panels, small (DPG) refers to an electric power source such as solar, wind or combined heat power (CHP) connected

  5. Optimal control of aeroacoustic noise generated by cylinder vortex interaction

    E-Print Network [OSTI]

    Heinkenschloss, Matthias

    of the blade resulting in a strong dipole type acoustic source. The noise generated by BVI is particularly severe, leading to environmental noise pollution in commercial applications and increased observability the fluid dynamics and acoustic mechanisms that result from BVI as well as to validate predictive techniques

  6. Optimal Placement and Sizing of Distributed Generator Units using Genetic Optimization

    E-Print Network [OSTI]

    -scale production units (e.g. fuel cells, micro-CHPs, photovoltaic panels) and the liberalization of the energy reliability, etc. This optimization problem can be solved in different ways like exhaustive searches [14

  7. 15.053 Optimization Methods in Management Science, Spring 2007

    E-Print Network [OSTI]

    Mamani, Hamed

    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. ...

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

    DOE Patents [OSTI]

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

    2013-04-09T23:59:59.000Z

    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.

  9. A Spectral Conjugate Gradient Method for Unconstrained Optimization

    SciTech Connect (OSTI)

    Birgin, E. G. [Department of Computer Science, IME-USP, University of Sao Paulo, Rua do Matao, 1010 - Cidade Universitaria, 05508-900 Sao Paulo SP (Brazil)], E-mail: egbirgin@ime.usp.br; Martinez, J. M. [Department of Applied Mathematics, IMECC-UNICAMP, University of Campinas, CP 6065, 13081-970 Campinas SP (Brazil)], E-mail: martinez@ime.unicamp.br

    2001-07-01T23:59:59.000Z

    A family of scaled conjugate gradient algorithms for large-scale unconstrained minimization is defined. The Perry, the Polak-Ribiere and the Fletcher-Reeves formulae are compared using a spectral scaling derived from Raydan's spectral gradient optimization method. The best combination of formula, scaling and initial choice of step-length is compared against well known algorithms using a classical set of problems. An additional comparison involving an ill-conditioned estimation problem in Optics is presented.

  10. Control and optimization system and method for chemical looping processes

    DOE Patents [OSTI]

    Lou, Xinsheng; Joshi, Abhinaya; Lei, Hao

    2014-06-24T23:59:59.000Z

    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.

  11. Guided wave methods and apparatus for nonlinear frequency generation

    DOE Patents [OSTI]

    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

    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.

  12. Optimal Path Generation for Monocular Simultaneous Localization and Mapping

    E-Print Network [OSTI]

    Roorda, Timothy Isaac

    2014-09-01T23:59:59.000Z

    Monocular Simultaneous Localization and Mapping (MonoSLAM), a derivative of Simultaneous Localization and Mapping (SLAM), is a navigation method for autonomous vehicles that uses only an inertial measurement unit and a camera to map the environment...

  13. Optimal Path Generation for Monocular Simultaneous Localization and Mapping

    E-Print Network [OSTI]

    Roorda, Timothy Isaac

    2014-09-01T23:59:59.000Z

    Monocular Simultaneous Localization and Mapping (MonoSLAM), a derivative of Simultaneous Localization and Mapping (SLAM), is a navigation method for autonomous vehicles that uses only an inertial measurement unit and a camera to map the environment...

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

    DOE Patents [OSTI]

    Lee, H.R.

    1997-11-18T23:59:59.000Z

    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. 5 figs.

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

    DOE Patents [OSTI]

    Lee, Heung-Rae (Dublin, CA)

    1997-01-01T23:59:59.000Z

    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.

  16. Geometry Optimization with QM/MM, ONIOM, and Other Combined Methods. I. Microiterations

    E-Print Network [OSTI]

    Schlegel, H. Bernhard

    Geometry Optimization with QM/MM, ONIOM, and Other Combined Methods. I. Microiterations calculation, have been very successful in describing large systems. Geometry optimization methods can take). A series of microit- erations can be employed to fully optimize the MM region for each optimization step

  17. Optimal working conditions for thermoelectric generators with realistic thermal coupling

    E-Print Network [OSTI]

    Apertet, Y; Glavatskaya, O; Goupil, C; Lecoeur, P

    2011-01-01T23:59:59.000Z

    We study how maximum output power can be obtained from a thermoelectric generator(TEG) with nonideal heat exchangers. We demonstrate with an analytic approach based on a force-flux formalism that the sole improvement of the intrinsic characteristics of thermoelectric modules including the enhancement of the figure of merit is of limited interest: the constraints imposed by the working conditions of the TEG must be considered on the same footing. Introducing an effective thermal conductance we derive the conditions which permit maximization of both efficiency and power production of the TEG dissipatively coupled to heat reservoirs. Thermal impedance matching must be accounted for as well as electrical impedance matching in order to maximize the output power. Our calculations also show that the thermal impedance does not only depend on the thermal conductivity at zero electrical current: it also depends on the TEG figure of merit. Our analysis thus yields both electrical and thermal conditions permitting optima...

  18. A new method for generating ultraintense and ultrashort laser pulses

    E-Print Network [OSTI]

    Loss, Daniel

    -cost ultrahigh-intensity laser systems. The field of amplification and compression of short laser pulses laser system, where the short laser pulse is amplified and compressed in plasma through resonantARTICLES A new method for generating ultraintense and ultrashort laser pulses JUN REN, WEIFENG

  19. Generator Coordinate Method framework for Double Beta Decay

    E-Print Network [OSTI]

    Andrzej Bobyk; Wies?aw A. Kami?ski

    2014-11-10T23:59:59.000Z

    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.

  20. A polynomial-time interior-point method for conic optimization, with ...

    E-Print Network [OSTI]

    2008-04-29T23:59:59.000Z

    Department of Electrical and Computer Engineering and Institute for Systems ... method for linear optimization problems can in principle be applied to conic optimization ...... projective method, Mathematical Programming 36 (1986), 183

  1. Isovector pairing collective motion: Generator-coordinate-method approach

    SciTech Connect (OSTI)

    Kyotoku, M.; Chen, H.

    1987-09-01T23:59:59.000Z

    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.

  2. Geometry optimization methods for modeling large molecules O don Farkasa,*, H. Bernhard Schlegelb

    E-Print Network [OSTI]

    Schlegel, H. Bernhard

    Geometry optimization methods for modeling large molecules O¨ do¨n Farkasa,*, H. Bernhard Schlegelb, Wayne State University, Detroit, USA Abstract Geometry optimization is an essential part of quantum that there are different requirements for a chosen optimization method. The proposed method aims to meet two requirements

  3. Continuous Control Primitive Trajectory Generation and Optimal Motion Splines for All-Wheel Steering Mobile

    E-Print Network [OSTI]

    Kelly, Alonzo

    algorithms based on the Ackermann, differential drive, or omnidirectional steering models. Ackerman with all-wheel steering capability differ from these models in that the velocity vector can be aimed in anyContinuous Control Primitive Trajectory Generation and Optimal Motion Splines for All

  4. Optimal Integration of Renewable Energy Resources in Data Centers with Behind-the-Meter Renewable Generator

    E-Print Network [OSTI]

    Mohsenian-Rad, Hamed

    1 Optimal Integration of Renewable Energy Resources in Data Centers with Behind-the-Meter Renewable-- Renewable energy resources, such as wind and solar power, are rapidly becoming generation technologies-temporal variations, the integration of renewable energy resources is usually very challenging. Some of the previously

  5. OPTIMAL OPERATION OF AN INTEGRATED ENERGY PARK INCLUDING FOSSIL FUEL POWER GENERATION,

    E-Print Network [OSTI]

    Stanford University

    OPTIMAL OPERATION OF AN INTEGRATED ENERGY PARK INCLUDING FOSSIL FUEL POWER GENERATION, CO2 CAPTURE AND WIND A THESIS SUBMITTED TO THE DEPARTMENT OF ENERGY RESOURCES ENGINEERING OF STANFORD UNIVERSITY of Master of Science in Energy Resources Engineering. (Louis J. Durlofsky) Principal Co-Adviser I certify

  6. Modeling and Optimization of Next Generation Feedstock Development for Chemical Process

    E-Print Network [OSTI]

    Grossmann, Ignacio E.

    Modeling and Optimization of Next Generation Feedstock Development for Chemical Process Industry -Glutamic acid Anaerobic digestion mass Cellulose Biogas Bio oil Gasoline Diesel Butanol Dimethyl ether,Oil Polyol Biodiesel Glycerin Naphtha and Diesel Liquefaction / d h l Thermo chemical Protein Protein

  7. Comments on Dual Methods for Nonconvex Spectrum Optimization ...

    E-Print Network [OSTI]

    2007-07-05T23:59:59.000Z

    Jul 5, 2007 ... Optimization of Multicarrier Systems. Tams Terlaky. ? ... optimization model for the multiuser power control optimization problem, and derived a strong duality ... system and the number of frequency carriers, respectively.

  8. Optimal Engineering System Design Guided by Data-Mining Methods

    E-Print Network [OSTI]

    Ding, Yu

    WORDS: Classification and regression tree; Fixture layout optimization; K-means clustering; Kriging of the data-miningaided optimal design is clearly demonstrated by comparison with both local optimization

  9. Seismic wave generation systems and methods for cased wells

    SciTech Connect (OSTI)

    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

    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.

  10. Design of a Lithium-ion Battery Pack for PHEV Using a Hybrid Optimization Method

    E-Print Network [OSTI]

    Papalambros, Panos

    Design of a Lithium-ion Battery Pack for PHEV Using a Hybrid Optimization Method Nansi Xue1 vehicle applications using a hybrid numerical optimization method that combines multiple individual is applied to minimize the mass, volume and material costs. The optimized pack design satisfies the energy

  11. Shape optimized headers and methods of manufacture thereof

    DOE Patents [OSTI]

    Perrin, Ian James

    2013-11-05T23:59:59.000Z

    Disclosed herein is a shape optimized header comprising a shell that is operative for collecting a fluid; wherein an internal diameter and/or a wall thickness of the shell vary with a change in pressure and/or a change in a fluid flow rate in the shell; and tubes; wherein the tubes are in communication with the shell and are operative to transfer fluid into the shell. Disclosed herein is a method comprising fixedly attaching tubes to a shell; wherein the shell is operative for collecting a fluid; wherein an internal diameter and/or a wall thickness of the shell vary with a change in pressure and/or a change in a fluid flow rate in the shell; and wherein the tubes are in communication with the shell and are operative to transfer fluid into the shell.

  12. Various methods of optimizing control pulses for quantum systems with decoherence

    E-Print Network [OSTI]

    ?ukasz Pawela; Przemys?aw Sadowski

    2014-07-22T23:59:59.000Z

    We study three methods of obtaining an approximation of unitary evolution of a quantum system under decoherence. We use three methods of optimizing the control pulses: genetic optimization, approximate evolution method and approximate gradient method. To model the noise in the system we use the Lindblad equaiton. We obtain results showing that genetic optimization may give a better approximation of a unitary evolution in the case of high noise.

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

    E-Print Network [OSTI]

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

    2014-03-13T23:59:59.000Z

    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.

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

    SciTech Connect (OSTI)

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

    2012-09-01T23:59:59.000Z

    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.

  15. Optimization Methods for Disease Prevention and Epidemic Control ...

    E-Print Network [OSTI]

    2013-09-29T23:59:59.000Z

    Department of Electrical Engineering and Computer Science, Vanderbilt University ... is to formulate mathematical optimization models, for identifying which...

  16. Optimization Online - Discrete gradient method: a derivative free ...

    E-Print Network [OSTI]

    Adil Bagirov

    2006-05-01T23:59:59.000Z

    May 1, 2006 ... ... is supported by the Mathematical Programming Society and by the Optimization Technology Center. Mathematical Programming Society.

  17. Methods for Local and Global Optimization Constantinos Voglis

    E-Print Network [OSTI]

    Voglis, Costas

    conformation; finding the optimal trajectory for an aircraft or a robot arm; identifying the seismic properties conformation; finding the optimal trajectory for an aircraft or a robot arm; identifying the seismic properties conformation; finding the optimal trajectory for an aircraft or a robot arm; identifying the seismic properties

  18. Method and apparatus for automated, modular, biomass power generation

    DOE Patents [OSTI]

    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

    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.

  19. Method and apparatus for automated, modular, biomass power generation

    DOE Patents [OSTI]

    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

    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.

  20. Fuel processor and method for generating hydrogen for fuel cells

    DOE Patents [OSTI]

    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

    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.

  1. Next Generation Nuclear Plant Methods Technical Program Plan

    SciTech Connect (OSTI)

    Richard R. Schultz; Abderrafi M. Ougouag; David W. Nigg; Hans D. Gougar; Richard W. Johnson; William K. Terry; Chang H. Oh; Donald W. McEligot; Gary W. Johnsen; Glenn E. McCreery; Woo Y. Yoon; James W. Sterbentz; J. Steve Herring; Temitope A. Taiwo; Thomas Y. C. Wei; William D. Pointer; Won S. Yang; Michael T. Farmer; Hussein S. Khalil; Madeline A. Feltus

    2007-01-01T23:59:59.000Z

    One of the great challenges of designing and licensing the Very High Temperature Reactor (VHTR) is to confirm that the intended VHTR analysis tools can be used confidently to make decisions and to assure all that the reactor systems are safe and meet the performance objectives of the Generation IV Program. The research and development (R&D) projects defined in the Next Generation Nuclear Plant (NGNP) Design Methods Development and Validation Program will ensure that the tools used to perform the required calculations and analyses can be trusted. The Methods R&D tasks are designed to ensure that the calculational envelope of the tools used to analyze the VHTR reactor systems encompasses, or is larger than, the operational and transient envelope of the VHTR itself. The Methods R&D focuses on the development of tools to assess the neutronic and thermal fluid behavior of the plant. The fuel behavior and fission product transport models are discussed in the Advanced Gas Reactor (AGR) program plan. Various stress analysis and mechanical design tools will also need to be developed and validated and will ultimately also be included in the Methods R&D Program Plan. The calculational envelope of the neutronics and thermal-fluids software tools intended to be used on the NGNP is defined by the scenarios and phenomena that these tools can calculate with confidence. The software tools can only be used confidently when the results they produce have been shown to be in reasonable agreement with first-principle results, thought-problems, and data that describe the highly ranked phenomena inherent in all operational conditions and important accident scenarios for the VHTR.

  2. Next Generation Nuclear Plant Methods Technical Program Plan

    SciTech Connect (OSTI)

    Richard R. Schultz; Abderrafi M. Ougouag; David W. Nigg; Hans D. Gougar; Richard W. Johnson; William K. Terry; Chang H. Oh; Donald W. McEligot; Gary W. Johnsen; Glenn E. McCreery; Woo Y. Yoon; James W. Sterbentz; J. Steve Herring; Temitope A. Taiwo; Thomas Y. C. Wei; William D. Pointer; Won S. Yang; Michael T. Farmer; Hussein S. Khalil; Madeline A. Feltus

    2010-12-01T23:59:59.000Z

    One of the great challenges of designing and licensing the Very High Temperature Reactor (VHTR) is to confirm that the intended VHTR analysis tools can be used confidently to make decisions and to assure all that the reactor systems are safe and meet the performance objectives of the Generation IV Program. The research and development (R&D) projects defined in the Next Generation Nuclear Plant (NGNP) Design Methods Development and Validation Program will ensure that the tools used to perform the required calculations and analyses can be trusted. The Methods R&D tasks are designed to ensure that the calculational envelope of the tools used to analyze the VHTR reactor systems encompasses, or is larger than, the operational and transient envelope of the VHTR itself. The Methods R&D focuses on the development of tools to assess the neutronic and thermal fluid behavior of the plant. The fuel behavior and fission product transport models are discussed in the Advanced Gas Reactor (AGR) program plan. Various stress analysis and mechanical design tools will also need to be developed and validated and will ultimately also be included in the Methods R&D Program Plan. The calculational envelope of the neutronics and thermal-fluids software tools intended to be used on the NGNP is defined by the scenarios and phenomena that these tools can calculate with confidence. The software tools can only be used confidently when the results they produce have been shown to be in reasonable agreement with first-principle results, thought-problems, and data that describe the highly ranked phenomena inherent in all operational conditions and important accident scenarios for the VHTR.

  3. Next Generation Nuclear Plant Methods Technical Program Plan -- PLN-2498

    SciTech Connect (OSTI)

    Richard R. Schultz; Abderrafi M. Ougouag; David W. Nigg; Hans D. Gougar; Richard W. Johnson; William K. Terry; Chang H. Oh; Donald W. McEligot; Gary W. Johnsen; Glenn E. McCreery; Woo Y. Yoon; James W. Sterbentz; J. Steve Herring; Temitope A. Taiwo; Thomas Y. C. Wei; William D. Pointer; Won S. Yang; Michael T. Farmer; Hussein S. Khalil; Madeline A. Feltus

    2010-09-01T23:59:59.000Z

    One of the great challenges of designing and licensing the Very High Temperature Reactor (VHTR) is to confirm that the intended VHTR analysis tools can be used confidently to make decisions and to assure all that the reactor systems are safe and meet the performance objectives of the Generation IV Program. The research and development (R&D) projects defined in the Next Generation Nuclear Plant (NGNP) Design Methods Development and Validation Program will ensure that the tools used to perform the required calculations and analyses can be trusted. The Methods R&D tasks are designed to ensure that the calculational envelope of the tools used to analyze the VHTR reactor systems encompasses, or is larger than, the operational and transient envelope of the VHTR itself. The Methods R&D focuses on the development of tools to assess the neutronic and thermal fluid behavior of the plant. The fuel behavior and fission product transport models are discussed in the Advanced Gas Reactor (AGR) program plan. Various stress analysis and mechanical design tools will also need to be developed and validated and will ultimately also be included in the Methods R&D Program Plan. The calculational envelope of the neutronics and thermal-fluids software tools intended to be used on the NGNP is defined by the scenarios and phenomena that these tools can calculate with confidence. The software tools can only be used confidently when the results they produce have been shown to be in reasonable agreement with first-principle results, thought-problems, and data that describe the highly ranked phenomena inherent in all operational conditions and important accident scenarios for the VHTR.

  4. Optimal Control Using an Algebraic Method for Control-Affine Nonlinear Systems

    E-Print Network [OSTI]

    Won, Chang-Hee

    of researchers have worked on the nonlinear optimal control problem, but they usually assume a linear systemOptimal Control Using an Algebraic Method for Control-Affine Nonlinear Systems Chang-Hee Won, 2007 Abstract A deterministic optimal control problem is solved for a control-affine nonlin- ear system

  5. A Parallel Modified Lagrangian Method for an Optimal Control Problem of a Linear Distributed Stochastic System

    E-Print Network [OSTI]

    A Parallel Modified Lagrangian Method for an Optimal Control Problem of a Linear Distributed@informatik.uni-halle.de Abstract We consider an optimal control problem for a Hilbert space valued linear* * stochastic Optimization, Control, Parallel Algorithms AMS Classification: 65Y05, 93E20, 93E23 1 Introduction

  6. A constructive interior penalty method for optimal control problems with state and input constraints.

    E-Print Network [OSTI]

    which allows us to address constrained optimal control of non linear systems by interior penalty methods in the article. It is shown that it allows us to approach the solution of the non linear optimal control problem a constrained optimal control problem (COCP) for a general single-input single-output (SISO) with non linear

  7. 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 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

  8. Sample Size Selection in Optimization Methods for Machine Learning

    E-Print Network [OSTI]

    2011-10-18T23:59:59.000Z

    Oct 18, 2011 ... optimization algorithms for machine learning and stochastic ..... stochastic nature of the problem, we could try to derive conditions of the sam-.

  9. A comparison of sample-based Stochastic Optimal Control methods

    E-Print Network [OSTI]

    Pierre Girardeau

    2010-02-10T23:59:59.000Z

    Feb 10, 2010 ... Abstract: In this paper, we compare the performance of two ... algorithm and the optimal strategy, as a performance indicator for the two models.

  10. Optimization Online - Active-set prediction for interior point methods ...

    E-Print Network [OSTI]

    Coralia Cartis

    2014-05-18T23:59:59.000Z

    May 18, 2014 ... Abstract: We propose the use of controlled perturbations to address the challenging question of optimal active-set prediction for interior point...

  11. Optimization Online - Interior-point method for nonlinear ...

    E-Print Network [OSTI]

    Ladislav Luksan

    2009-02-25T23:59:59.000Z

    Feb 25, 2009 ... The algorithm was implemented in the interactive system for universal functional optimization UFO. Results of extensive numerical experiments...

  12. A new method to generate dust with astrophysical properties

    SciTech Connect (OSTI)

    Hansen, J F; van Breugel, W; Bringa, E M; Graham, G A; Remington, B A; Taylor, E A; Tielens, A G

    2010-04-21T23:59:59.000Z

    In interstellar and interplanetary space, the size distribution and composition of dust grains play an important role. For example, dust grains determine optical and ultraviolet extinction levels in astronomical observations, dominate the cooling rate of our Galaxy, and sets the thermal balance and radiative cooling rates in molecular clouds, which are the birth place of stars. Dust grains are also a source of damage and failure to space hardware and thus present a hazard to space flight. To model the size distribution and composition of dust grains, and their effect in the above scenarios, it is vital to understand the mechanism of dust-shock interaction. We demonstrate a new experiment which employs a laser to subject dust grains to pressure spikes similar to those of colliding astrophysical dust, and which accelerates the grains to astrophysical velocities. The new method generates much larger data sets than earlier methods; we show how large quantities (thousands) of grains are accelerated at once, rather than accelerating individual grains, as is the case of earlier methods using electric fields.

  13. Solving the Unit Commitment Problem in Power Generation by Primal and Dual Methods

    E-Print Network [OSTI]

    Rmisch, Werner

    - storage hydro plants a large-scale mixed integer optimization model for unit commitment is developed optimal scheduling of on/o decisions and output levels for generating units in a power system over on the shares of nuclear, conventional thermal, hydro and pumped-storage hydro power in the underlying

  14. TO BE PRESENTED AT 2006 POWERCON, CHONGQING, CHINA, OCT 2006 A Hybrid Method for Multi-Area Generation

    E-Print Network [OSTI]

    -Area Generation Expansion using Tabu-search and Dynamic Programming Panida Jirutitijaroen, Student Member, IEEE using dynamic programming for the solution of generation expansion and placement considering reliability, Reliability, Tabu Search, Power System Optimization, Global Decomposition, Generation Adequacy, Dynamic

  15. Method of generating hydrogen by catalytic decomposition of water

    DOE Patents [OSTI]

    Balachandran, Uthamalingam (Hinsdale, IL); Dorris, Stephen E. (LaGrange Park, IL); Bose, Arun C. (Pittsburgh, PA); Stiegel, Gary J. (Library, PA); Lee, Tae-Hyun (Naperville, IL)

    2002-01-01T23:59:59.000Z

    A method for producing hydrogen includes providing a feed stream comprising water; contacting at least one proton conducting membrane adapted to interact with the feed stream; splitting the water into hydrogen and oxygen at a predetermined temperature; and separating the hydrogen from the oxygen. Preferably the proton conducting membrane comprises a proton conductor and a second phase material. Preferable proton conductors suitable for use in a proton conducting membrane include a lanthanide element, a Group VIA element and a Group IA or Group IIA element such as barium, strontium, or combinations of these elements. More preferred proton conductors include yttrium. Preferable second phase materials include platinum, palladium, nickel, cobalt, chromium, manganese, vanadium, silver, gold, copper, rhodium, ruthenium, niobium, zirconium, tantalum, and combinations of these. More preferably second phase materials suitable for use in a proton conducting membrane include nickel, palladium, and combinations of these. The method for generating hydrogen is preferably preformed in the range between about 600.degree. C. and 1,700.degree. C.

  16. Capacitive charge generation apparatus and method for testing circuits

    DOE Patents [OSTI]

    Cole, E.I. Jr.; Peterson, K.A.; Barton, D.L.

    1998-07-14T23:59:59.000Z

    An electron beam apparatus and method for testing a circuit are disclosed. The electron beam apparatus comprises an electron beam incident on an outer surface of an insulating layer overlying one or more electrical conductors of the circuit for generating a time varying or alternating current electrical potential on the surface; and a measurement unit connected to the circuit for measuring an electrical signal capacitively coupled to the electrical conductors to identify and map a conduction state of each of the electrical conductors, with or without an electrical bias signal being applied to the circuit. The electron beam apparatus can further include a secondary electron detector for forming a secondary electron image for registration with a map of the conduction state of the electrical conductors. The apparatus and method are useful for failure analysis or qualification testing to determine the presence of any open-circuits or short-circuits, and to verify the continuity or integrity of electrical conductors buried below an insulating layer thickness of 1-100 {micro}m or more without damaging or breaking down the insulating layer. The types of electrical circuits that can be tested include integrated circuits, multi-chip modules, printed circuit boards and flexible printed circuits. 7 figs.

  17. Capacitive charge generation apparatus and method for testing circuits

    DOE Patents [OSTI]

    Cole, Jr., Edward I. (Albuquerque, NM); Peterson, Kenneth A. (Albuquerque, NM); Barton, Daniel L. (Albuquerque, NM)

    1998-01-01T23:59:59.000Z

    An electron beam apparatus and method for testing a circuit. The electron beam apparatus comprises an electron beam incident on an outer surface of an insulating layer overlying one or more electrical conductors of the circuit for generating a time varying or alternating current electrical potential on the surface; and a measurement unit connected to the circuit for measuring an electrical signal capacitively coupled to the electrical conductors to identify and map a conduction state of each of the electrical conductors, with or without an electrical bias signal being applied to the circuit. The electron beam apparatus can further include a secondary electron detector for forming a secondary electron image for registration with a map of the conduction state of the electrical conductors. The apparatus and method are useful for failure analysis or qualification testing to determine the presence of any open-circuits or short-circuits, and to verify the continuity or integrity of electrical conductors buried below an insulating layer thickness of 1-100 .mu.m or more without damaging or breaking down the insulating layer. The types of electrical circuits that can be tested include integrated circuits, multi-chip modules, printed circuit boards and flexible printed circuits.

  18. Thermoelectric generator cooling system and method of control

    DOE Patents [OSTI]

    Prior, Gregory P; Meisner, Gregory P; Glassford, Daniel B

    2012-10-16T23:59:59.000Z

    An apparatus is provided that includes a thermoelectric generator and an exhaust gas system operatively connected to the thermoelectric generator to heat a portion of the thermoelectric generator with exhaust gas flow through the thermoelectric generator. A coolant system is operatively connected to the thermoelectric generator to cool another portion of the thermoelectric generator with coolant flow through the thermoelectric generator. At least one valve is controllable to cause the coolant flow through the thermoelectric generator in a direction that opposes a direction of the exhaust gas flow under a first set of operating conditions and to cause the coolant flow through the thermoelectric generator in the direction of exhaust gas flow under a second set of operating conditions.

  19. Methods and apparatus for cooling wind turbine generators

    DOE Patents [OSTI]

    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

    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.

  20. Optimization Online Digest -- January 2015

    E-Print Network [OSTI]

    Object-Parallel Infrastructure for Implementing First-Order Methods, with an Example ... Partially Adaptive Stochastic Optimization for Electric Power Generation...

  1. Development of Combinatorial Methods for Alloy Design and Optimization

    SciTech Connect (OSTI)

    Pharr, George M.; George, Easo P.; Santella, Michael L

    2005-07-01T23:59:59.000Z

    The primary goal of this research was to develop a comprehensive methodology for designing and optimizing metallic alloys by combinatorial principles. Because conventional techniques for alloy preparation are unavoidably restrictive in the range of alloy composition that can be examined, combinatorial methods promise to significantly reduce the time, energy, and expense needed for alloy design. Combinatorial methods can be developed not only to optimize existing alloys, but to explore and develop new ones as well. The scientific approach involved fabricating an alloy specimen with a continuous distribution of binary and ternary alloy compositions across its surface--an ''alloy library''--and then using spatially resolved probing techniques to characterize its structure, composition, and relevant properties. The three specific objectives of the project were: (1) to devise means by which simple test specimens with a library of alloy compositions spanning the range interest can be produced; (2) to assess how well the properties of the combinatorial specimen reproduce those of the conventionally processed alloys; and (3) to devise screening tools which can be used to rapidly assess the important properties of the alloys. As proof of principle, the methodology was applied to the Fe-Ni-Cr ternary alloy system that constitutes many commercially important materials such as stainless steels and the H-series and C-series heat and corrosion resistant casting alloys. Three different techniques were developed for making alloy libraries: (1) vapor deposition of discrete thin films on an appropriate substrate and then alloying them together by solid-state diffusion; (2) co-deposition of the alloying elements from three separate magnetron sputtering sources onto an inert substrate; and (3) localized melting of thin films with a focused electron-beam welding system. Each of the techniques was found to have its own advantages and disadvantages. A new and very powerful technique for rapid structural and chemical characterization of alloy libraries was developed based on high intensity x-radiation available at synchrotron sources such as the Advanced Photon Source (APS) at Argonne National Laboratory (ANL). With the technique, structural and chemical characterization of up to 2500 discrete positions on a library can made in a period of less than 4 hours. Among the parameters that can be measured are the chemical composition, crystal structure, lattice parameters, texture, and grain size. From these, one can also deduce isothermal sections of ternary phase diagrams. The equipment and techniques needed to do this are now in place for use in future combinatorial studies at the ORNL beam line at the APS. In conjunction with the chemical and structural investigations, nanoindentation techniques were developed to investigate the mechanical properties of the combinatorial libraries. The two primary mechanical properties of interest were the elastic modulus, E, and hardness, H, both of which were measured on alloy library surfaces with spatial resolutions of better than 1 m. A nanoindentation testing system at ORNL was programmed to make a series of indentations at specified locations on the library surface and automatically collect and store all the data needed to obtain hardness and modulus as a function of position. Approximately 200 indentations can be made during an overnight run, which allows for mechanical property measurement over a wide range of chemical composition in a relatively short time. Since the materials based on the Fe-Ni-Cr system often find application in highly carburizing and harsh chemical environments, simple techniques were developed to assess the resistance of Fe-Ni-Cr alloy libraries to carburization and corrosion. Alloy libraries were carburized by standard techniques, and the effectiveness of the carburization at various points along the sample surface was assessed by nanoindentation hardness measurement. Corrosion tests were conducted by placing library specimens in highly corrosive aqueous environments, with the corr

  2. On the method of optimal portfolio choice by cost-efficiency

    E-Print Network [OSTI]

    Rschendorf, Ludger

    On the method of optimal portfolio choice by cost-efficiency Ludger Ruschendorf*, Viktor Wolf Freiburg, Germany Abstract We develop the method of optimal portfolio choice based on the concept of cost-efficiency class of cost-efficient payoffs. While the results for the cost-efficient payoff given so far

  3. Performance of Hybrid Methods for Large-Scale Unconstrained Optimization as Applied

    E-Print Network [OSTI]

    Navon, Michael

    Performance of Hybrid Methods for Large-Scale Unconstrained Optimization as Applied to Models. It is shown that for the optimal parameters the hybrid approach is typically two times more efficient in terms1231, 2003 Key words: energy minimization; proteins; loops; hybrid method; truncated Newton; dielectric

  4. An Optimal Power Flow (OPF) Method with Improved Power System Stability

    E-Print Network [OSTI]

    Chen, Zhe

    An Optimal Power Flow (OPF) Method with Improved Power System Stability Chi Su, Zhe Chen Department corresponding to certain critical oscillation modes. Power system stabilizer (PSS) and thyristor controlled an optimal power flow (OPF) method taking into account small signal stability as additional constraints

  5. Evaluation of Parallel Decomposition Methods for Biomechanical Optimizations

    E-Print Network [OSTI]

    George, Alan D.

    that parallelizes the analysis function (i.e., a kinematic or dynamic simulation) called repeatedly by the optimizer , Jeffrey A. Reinbolt2,3 , Benjamin J. Fregly2,3 , and Alan D. George1 1 Department of Electrical & Computer

  6. Coordinate and Subspace Optimization Methods for Linear Least ...

    E-Print Network [OSTI]

    2006-05-08T23:59:59.000Z

    May 8, 2006 ... signal is a linear combination of these atoms, i.e. x = ?z. (1.2) is the .... Assume that within an iterative optimization process of minimizing (1.1),.

  7. An Improved Lagrangian Relaxation Method for VLSI Combinational Circuit Optimization

    E-Print Network [OSTI]

    Huang, Yi-Le

    2012-02-14T23:59:59.000Z

    Gate sizing and threshold voltage (Vt) assignment are very popular and useful techniques in current very large scale integration (VLSI) design flow for timing and power optimization. Lagrangian relaxation (LR) is a common ...

  8. A doubly stabilized bundle method for nonsmooth convex optimization

    E-Print Network [OSTI]

    Welington Oliveira

    2013-04-13T23:59:59.000Z

    Apr 13, 2013 ... ... new variant is able to update the lower bound for the optimal value, ... (the model unit-commitment problem in the energy sector, two-stage...

  9. GRADIENT-BASED STOCHASTIC OPTIMIZATION METHODS IN BAYESIAN EXPERIMENTAL DESIGN

    E-Print Network [OSTI]

    Huan, Xun

    2014-01-01T23:59:59.000Z

    Optimal experimental design (OED) seeks experiments expected to yield the most useful data for some purpose. In practical circumstances where experiments are time-consuming or resource-intensive, OED can yield enormous ...

  10. Compensating Customer-Generators: A taxonomy describing methods of compensating

    E-Print Network [OSTI]

    Hughes, Larry

    , investment in grid-connected generation capacity is growing at a faster rate than off-grid applications (IEA

  11. Body Fitted Grid Generation Method with Moving Boundaries and Its Application for analysis of MEMS

    E-Print Network [OSTI]

    Tentzeris, Manos

    Body Fitted Grid Generation Method with Moving Boundaries and Its Application for analysis of MEMS these MEMS devices using body fitted grid generation method with moving boundaries is proposed. This technique is based on the finite-difference time-domain (FD-TD) method and a kind of grid generation

  12. Generation and Optimization of Test cases for Object-Oriented Software Using State Chart Diagram

    E-Print Network [OSTI]

    Swain, Ranjita Kumari; Mohapatra, Durga Prasad

    2012-01-01T23:59:59.000Z

    The process of testing any software system is an enormous task which is time consuming and costly. The time and required effort to do sufficient testing grow, as the size and complexity of the software grows, which may cause overrun of the project budget, delay in the development of software system or some test cases may not be covered. During SDLC (software development life cycle), generally the software testing phase takes around 40-70% of the time and cost. State-based testing is frequently used in software testing. Test data generation is one of the key issues in software testing. A properly generated test suite may not only locate the errors in a software system, but also help in reducing the high cost associated with software testing. It is often desired that test data in the form of test sequences within a test suite can be automatically generated to achieve required test coverage. This paper proposes an optimization approach to test data generation for the state-based software testing. In this paper, ...

  13. Iterative methods for large-scale unconstrained optimization

    E-Print Network [OSTI]

    Erway, Jennifer B.

    2006-01-01T23:59:59.000Z

    T. Steihaug. The conjugate gradient method and trust regionsCholesky-conjugate gradient method for the iterativemethod. A vanilla conjugate-gradient method for minimizing q

  14. Projected-search methods for box-constrained optimization

    E-Print Network [OSTI]

    Ferry, Michael William

    2011-01-01T23:59:59.000Z

    method, such as the conjugate-gradient method, to minimize aobtained from a conjugate-gradient method, the line search1 when using a conjugate-gradient method. Roughly speaking,

  15. Optimal selection of on-site generation with combined heat andpower applications

    SciTech Connect (OSTI)

    Siddiqui, Afzal S.; Marnay, Chris; Bailey, Owen; HamachiLaCommare, Kristina

    2004-11-30T23:59:59.000Z

    While demand for electricity continues to grow, expansion of the traditional electricity supply system, or macrogrid, is constrained and is unlikely to keep pace with the growing thirst western economies have for electricity. Furthermore, no compelling case has been made that perpetual improvement in the overall power quality and reliability (PQR)delivered is technically possible or economically desirable. An alternative path to providing high PQR for sensitive loads would generate close to them in microgrids, such as the Consortium for Electricity Reliability Technology Solutions (CERTS) Microgrid. Distributed generation would alleviate the pressure for endless improvement in macrogrid PQR and might allow the establishment of a sounder economically based level of universal grid service. Energy conversion from available fuels to electricity close to loads can also provide combined heat and power (CHP) opportunities that can significantly improve the economics of small-scale on-site power generation, especially in hot climates when the waste heat serves absorption cycle cooling equipment that displaces expensive on-peak electricity. An optimization model, the Distributed Energy Resources Customer Adoption Model (DER-CAM), developed at Berkeley Lab identifies the energy bill minimizing combination of on-site generation and heat recovery equipment for sites, given their electricity and heat requirements, the tariffs they face, and a menu of available equipment. DER-CAM is used to conduct a systemic energy analysis of a southern California naval base building and demonstrates atypical current economic on-site power opportunity. Results achieve cost reductions of about 15 percent with DER, depending on the tariff.Furthermore, almost all of the energy is provided on-site, indicating that modest cost savings can be achieved when the microgrid is free to select distributed generation and heat recovery equipment in order to minimize its over all costs.

  16. AM 121: Intro to Optimization Models and Methods

    E-Print Network [OSTI]

    Chen, Yiling

    s and dual surplus var's If there is slack in the primal resource constraint, then dual ( shadow price ) should be zero If the shadow price is non-zero, then there must be scarce resources (no slack in primal: Complementary Slackness Lesson Plan Complementary slackness A compatibility requirement between an optimal

  17. Hybrid methods for interplanetary low-thrust trajectory optimization

    E-Print Network [OSTI]

    Aroonwilairut, Krisada

    2002-01-01T23:59:59.000Z

    Fiiral Con rli fiona The initial and f!nal cond!tin!zs are given in Table 2-2. Table 2-2: Irutial and Fmal Conditions of P rample 2-I initial time (r, ) Final time (tr) pir, Optimal Control Formulation The objective function for a minimum...

  18. A SURVEY OF MULTI-START METHODS FOR COMBINATORIAL OPTIMIZATION

    E-Print Network [OSTI]

    Fisher, Kathleen

    not used to address problems in the realm of optimization as we view it today. More recently, Glover (1977;2 RAFAEL MART´I, MAURICIO G.C. RESENDE, AND CELSO C. RIBEIRO this framework are given in (Glover (1986), Glover (1989), and Glover (2000)) ad- dressing controlled randomization, learning strategies, induced

  19. DYNAMIC EMBEDDED OPTIMIZATION AND SHOOTING METHODS FOR POWER

    E-Print Network [OSTI]

    state variables. The dynamic model is embedded within the constraints. Power systems form an important for Deregulated Electric Power Systems: Optimization, Control, and Computational Intelligence, J. Chow, F. Wu consequences in the latter case [1]. Even the tuning of traditional controllers such as power system sta

  20. MASTER'S THESIS A method for simulation based optimization

    E-Print Network [OSTI]

    Patriksson, Michael

    ;Matematiskt centrum Gteborg 2007 #12;Abstract The background of this thesis was the GMMC Combustion Engine-projektet Combustion Engine Optimization som inleddes under vren 2006. En global optimeringsalgoritm som anvnder sig for Strategic Research (SSF). All members in GMMC Combustion Engine Optimiza- tion should be mentioned, Mattias

  1. Method and apparatus for generating low energy nuclear particles

    DOE Patents [OSTI]

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

    1999-02-09T23:59:59.000Z

    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.

  2. Method and apparatus for generating low energy nuclear particles

    DOE Patents [OSTI]

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

    1999-02-09T23:59:59.000Z

    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.

  3. DifferentialGeometric Methods: a Powerful Set of New Tools for Optimal Control

    E-Print Network [OSTI]

    Sussmann, Hector

    such as static and dynamic stabilization, linear­quadratic control, linear time­optimal control, various nonlinear systems ?? x = f(x; u), possibly linear in the control u, posssibly required to satisfy someDifferential­Geometric Methods: a Powerful Set of New Tools for Optimal Control H'ector J. Sussmann

  4. Use of Short-cut Methods to Analyse Optimal Operation of Petlyuk Distillation Columns

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Use of Short-cut Methods to Analyse Optimal Operation of Petlyuk Distillation Columns Ivar J: Petlyuk distillation column, dividing wall column, optimizing control, minimum energy 1. INTRODUCTION- ments for the level of automatic control and to the design of number of stages in each column section. 2

  5. Use of Shortcut Methods to Analyse Optimal Operation of Petlyuk Distillation Columns

    E-Print Network [OSTI]

    Skogestad, Sigurd

    Use of Shortcut Methods to Analyse Optimal Operation of Petlyuk Distillation Columns Ivar J: Petlyuk distillation column, dividing wall column, optimizing control, minimum energy 1. INTRODUCTION ments for the level of automatic control and to the design of number of stages in each column section. 2

  6. Thermoelectric generator and method for the fabrication thereof

    DOE Patents [OSTI]

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

    1987-01-01T23:59:59.000Z

    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.

  7. Thermoelectric generator and method for the fabrication thereof

    DOE Patents [OSTI]

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

    1984-08-01T23:59:59.000Z

    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.

  8. Cold weather hydrogen generation system and method of operation

    DOE Patents [OSTI]

    Dreier, Ken Wayne (Madison, CT); Kowalski, Michael Thomas (Seymour, CT); Porter, Stephen Charles (Burlington, CT); Chow, Oscar Ken (Simsbury, CT); Borland, Nicholas Paul (Montpelier, VT); Goyette, Stephen Arthur (New Hartford, CT)

    2010-12-14T23:59:59.000Z

    A system for providing hydrogen gas is provided. The system includes a hydrogen generator that produces gas from water. One or more heat generation devices are arranged to provide heating of the enclosure during different modes of operation to prevent freezing of components. A plurality of temperature sensors are arranged and coupled to a controller to selectively activate a heat source if the temperature of the component is less than a predetermined temperature.

  9. Optimization Online - On fast trust region methods for quadratic ...

    E-Print Network [OSTI]

    M.J.D. Powell

    2014-08-29T23:59:59.000Z

    Aug 29, 2014 ... Trust region methods include a bound of the form ||x_{k+1}-x_k|| .leq. ... Conjugate gradient and Krylov subspace methods are addressed for...

  10. survey of trust-region derivative free optimization methods

    E-Print Network [OSTI]

    2007-06-14T23:59:59.000Z

    Department of Mathematics & Institute of Applied Mathematics ...... Computer Methods in Applied Mechanics and Engineering, 190 (2001), 52975310.

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

    E-Print Network [OSTI]

    Singh, Baljeet

    2012-02-14T23:59:59.000Z

    In the past three decades, numerous methods have been proposed to transcribe optimal control problems (OCP) into nonlinear programming problems (NLP). In this dissertation work, a unifying weighted residual framework is developed under which most...

  12. Coordinate system dependence of muscle forces predicted using optimization methods in musculoskeletal joints

    E-Print Network [OSTI]

    Pierce, Janine E. (Janine Elizabeth), 1980-

    2004-01-01T23:59:59.000Z

    Optimization methods are widely used to predict in-vivo muscle forces in musculoskeletal joints. Moment equilibrium at the joint center (usually defined as the origin of the joint coordinate system) has been used as a ...

  13. Techniques for solving Nonlinear Programming Problems with Emphasis on Interior Point Methods and Optimal Control Problems

    E-Print Network [OSTI]

    Buchanan, Catherine

    2008-01-01T23:59:59.000Z

    The primary focus of this work is a thorough research into the current available techniques for solving nonlinear programming problems. Emphasis is placed on interior-point methods and the connection between optimal ...

  14. Beyond parallax barriers: applying formal optimization methods to multilayer automultiscopic displays

    E-Print Network [OSTI]

    Lanman, Douglas

    This paper focuses on resolving long-standing limitations of parallax barriers by applying formal optimization methods. We consider two generalizations of conventional parallax barriers. First, we consider general two-layer ...

  15. Structure-exploiting interior point methods for security constrained optimal power flow problems

    E-Print Network [OSTI]

    Chiang, Naiyuan

    2013-07-01T23:59:59.000Z

    The aim of this research is to demonstrate some more efficient approaches to solve the n-1 security constrained optimal power flow (SCOPF) problems by using structure-exploiting primal-dual interior point methods ...

  16. The Trust Region Sequential Quadratic Programming method applied to two-aircraft acoustic optimal control problem

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    The Trust Region Sequential Quadratic Programming method applied to two-aircraft acoustic optimal of the environmental pollution and noise impact, ACARE requires a 50% reduction of perceived noise for 2020. This goal

  17. Successive Backward Sweep Methods for Optimal Control of Nonlinear Systems with Constraints

    E-Print Network [OSTI]

    Cho, Donghyurn

    2013-08-13T23:59:59.000Z

    Continuous and discrete-time Successive Backward Sweep (SBS) methods for solving nonlinear optimal control problems involving terminal and control constraints are proposed in this dissertation. They closely resemble the Neighboring Extremals...

  18. The Fourier method for tri-atomic systems in the search for the optimal coordinate system

    E-Print Network [OSTI]

    Zeiri, Yehuda

    The Fourier method for tri-atomic systems in the search for the optimal coordinate system Gil Katz, the Hebrew University, Jerusalem 91904 Received 20 September 2001; accepted 12 December 2001 The Fourier grid

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

    E-Print Network [OSTI]

    Lee, Hsiang

    2003-01-01T23:59:59.000Z

    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...

  20. Method for generating long-range correlations for large systems Hernan A. Makse,1

    E-Print Network [OSTI]

    Stanley, H. Eugene

    Method for generating long-range correlations for large systems Herna´n A. Makse,1 Shlomo Havlin,1 Received 20 July 1995 We propose a method to generate a sequence of random numbers with long-range power-law correlations that overcomes known difficulties associated with large systems. The method presents

  1. Effective reentry methods reduce costs and optimize production

    SciTech Connect (OSTI)

    Szutiak, G.; Walker, D. [Baker Hughes Inteq, Calgary, Alberta (Canada)

    1996-10-21T23:59:59.000Z

    Favorable oil prices and tax incentives have spawned an increase in reentry drilling, adding new life to fields once abandoned in Canada. (The provincial government in Alberta has stimulated reentry drilling in western Canada by its tax royalty relief and incentives.) A review of four reentry projects covering 19 horizontal wells in western Canada illustrates a number of planning considerations that can save an operator money while ensuring optimization of the production. The paper recommends several standard steps in planning and executing slim hole reentries drawn from these projects.

  2. Optimized analysis method for indirect dark matter searches with imaging air Cherenkov telescopes

    SciTech Connect (OSTI)

    Aleksi?, J.; Martinez, M. [Institut de Fsica d'Altes Energies (IFAE), Campus UAB, E-08193 Bellaterra (Spain); Rico, J., E-mail: jelena@ifae.es, E-mail: jrico@ifae.es, E-mail: martinez@ifae.es [Instituci Catalana de Recerca i Estudis Avanats (ICREA), E-08010 Barcelona (Spain)

    2012-10-01T23:59:59.000Z

    We propose a dedicated analysis approach for indirect Dark Matter searches with Imaging Air Cherenkov Telescopes. By using the full likelihood analysis, we take complete advantage of the distinct features expected in the gamma ray spectrum of Dark Matter origin, achieving better sensitivity with respect to the standard analysis chains. We describe the method and characterize its general performance. We also compare its sensitivity with that of the current standards for several Dark Matter annihilation models, obtaining gains of up to factors of order of 10. We compute the improved limits that can be reached using this new approach, taking as an example existing estimates for several benchmark models as well as the recent results from VERITAS on observations of the dwarf spheroidal galaxy Segue 1. Furthermore, we estimate the sensitivity of Cherenkov Telescopes for monochromatic line signals. Predictions are made on improvement that can be achieved for MAGIC and CTA. Lastly, we discuss how this method can be applied in a global, sensitivity-optimized indirect Dark Matter search that combines the results of all Cherenkov observatories of the present generation.

  3. Method and apparatus for automobile actuated power generation

    SciTech Connect (OSTI)

    Rosenblum, J.

    1984-03-13T23:59:59.000Z

    A plurality of cylindrical rollers are embedded in a roadway over which wheeled vehicles move such that the vehicle wheels rotate the contacted rollers. A shaft transverse to the roadway supports the rollers and turns with them to transfer power from vehicle contact to an electrical generating apparatus. Power accumulating apparatus, such as a water or hydraulic fluid reservoir, may intervene between the shaft and the generator to smooth the power flow when vehicle travel is intermittent. Alternate apparatus may directly link the shaft to an electrical generator which may, in turn, charge batteries or pump water upwardly to accumulate power for response to later demand. The rollers may be housed in a metal or concrete trough and cross one or more lanes of traffic to a median power collector such as a spider and bevel gear arrangement that is capable of receiving rotating motion from four right angle directions at once. In its simplest form, power is taken from auto wheels to turn the rollers and their shaft or shafts, and shaft rotation is communicated directly to an electrical generator to supply demand.

  4. Optimization Online - Nonsmooth Methods for Control Design with ...

    E-Print Network [OSTI]

    Pierre Apkarian

    2015-02-24T23:59:59.000Z

    Feb 24, 2015 ... Nonsmooth Methods for Control Design with Integral Quadratic Constraints. Pierre Apkarian(Pierre.Apkarian ***at*** onera.fr) Dominikus...

  5. Optimization Online - Efficient First-Order Methods for Linear ...

    E-Print Network [OSTI]

    James Renegar

    2014-09-27T23:59:59.000Z

    Sep 27, 2014 ... Efficient First-Order Methods for Linear Programming and Semidefinite Programming. James Renegar (renegar ***at*** cornell.edu). Abstract:...

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

    E-Print Network [OSTI]

    Zijun Hao

    2014-04-26T23:59:59.000Z

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

  7. Optimization Online - A Reliable Affine Relaxation Method for Global ...

    E-Print Network [OSTI]

    Jordan Ninin

    2012-10-23T23:59:59.000Z

    Oct 23, 2012 ... Pierre Hansen(pierre.hansen ***at*** gerad.ca). Abstract: An automatic method for constructing linear relaxations of constrained global...

  8. Optimization Online - On the equivalence of the method of conjugate ...

    E-Print Network [OSTI]

    Anders Forsgren

    2015-03-09T23:59:59.000Z

    Mar 9, 2015 ... Abstract: In this paper we state necessary and sufficient conditions for equivalence of the method of conjugate gradients and quasi-Newton...

  9. Optimization Online - $S_{0.5}$ Regularization Methods and Fixed ...

    E-Print Network [OSTI]

    Peng Dingtao

    2013-01-10T23:59:59.000Z

    Jan 10, 2013 ... $S_{0.5}$ Regularization Methods and Fixed Point Algorithms for Affine Rank Minimization Problems. Peng Dingtao (dingtaopeng ***at***...

  10. Optimization Online - Linearizing the Method of Conjugate Gradients

    E-Print Network [OSTI]

    Serge Gratton

    2012-09-09T23:59:59.000Z

    Sep 9, 2012 ... Abstract: The method of conjugate gradients (CG) is widely used for the iterative solution of large sparse systems of equations $Ax=b$, where...

  11. Global methods for optimizing over the efficient set

    SciTech Connect (OSTI)

    Phong, Thai Quynh

    1994-12-31T23:59:59.000Z

    Let X{sub E} denote the efficient set of the multiple objective linear programming problem VMAX Cx subject to x {element_of} X, where C is a p {times} n matrix and X is a polytope in R{sup n}. We consider the problem max {l_brace}dx : x {element_of} X{sub E}{r_brace} which has many applications in multiple decision making. Since X{sub E} is generally nonconvex, this problem is classified as a global optimization problem. It has been shown that there exists a simplex {Lambda} in R{sup p} such that X{sub E} = {l_brace} {element_of} X : g{lambda} - {lambda}Cx {<=} 0, {lambda} {element_of} {Lambda}{r_brace} where g{lambda} = sup {l_brace}Cy : y {element_of} X{r_brace}. We seek a global {epsilon}-optimal solution {bar x} such that dx {<=} d{bar x} + {epsilon}, {forall}x {element_of} X{sub E}. In our approach, the main problem is to check, for a given {alpha}, whether the set X{sub E}{sup {alpha}} = {l_brace}x {element_of} X{sub E} : dx {>=} {alpha}{r_brace} = {l_brace}x {element_of} : g{lambda} - {lambda}Cx {<=} 0, {lambda} {element_of} {Lambda}, dx {>=} {alpha}{r_brace} is empty or not. We show that this problem can be reduced to the problem of finding a point of the set D/C where D, C are convex sets in R{sup p} {times} R. Based on this fact we propose different algorithms for obtaining a global {epsilon}-optimal solution, namely (1) an Outer Approximation algorithm; (2) a Bisection Search algorithm; (3) a Branch and Bound algorithm. All these algorithms are implementable and require solving only linear programs. Moreover, they are efficient when the number of criteria p is small relative to n.

  12. Methods for generating or increasing revenues from crops

    DOE Patents [OSTI]

    Copenhaver, Gregory P.; Keith, Kevin; Preuss, Daphne

    2007-03-20T23:59:59.000Z

    The present invention provides methods of doing business and providing services. For example, methods of increasing the revenue of crops are provided. To this end, the method includes the use of a nucleic acid sequences of plant centromeres. This will permit construction of stably inherited recombinant DNA constructs and mini chromosomes which can serve as vectors for the construction of transgenic plant and animal cells.

  13. Wind turbine/generator set and method of making same

    DOE Patents [OSTI]

    Bevington, Christopher M.; Bywaters, Garrett L.; Coleman, Clint C.; Costin, Daniel P.; Danforth, William L.; Lynch, Jonathan A.; Rolland, Robert H.

    2013-06-04T23:59:59.000Z

    A wind turbine comprising an electrical generator that includes a rotor assembly. A wind rotor that includes a wind rotor hub is directly coupled to the rotor assembly via a simplified connection. The wind rotor and generator rotor assembly are rotatably mounted on a central spindle via a bearing assembly. The wind rotor hub includes an opening having a diameter larger than the outside diameter of the central spindle adjacent the bearing assembly so as to allow access to the bearing assembly from a cavity inside the wind rotor hub. The spindle is attached to a turret supported by a tower. Each of the spindle, turret and tower has an interior cavity that permits personnel to traverse therethrough to the cavity of the wind rotor hub. The wind turbine further includes a frictional braking system for slowing, stopping or keeping stopped the rotation of the wind rotor and rotor assembly.

  14. Method for changing removable bearing for a wind turbine generator

    DOE Patents [OSTI]

    Bagepalli, Bharat Sampathkumaran (Niskayuna, NY); Jansen, Patrick Lee (Scotia, NY); Gadre, Aniruddha Dattatraya (Rexford, NY)

    2008-04-22T23:59:59.000Z

    A wind generator having removable change-out bearings includes a rotor and a stator, locking bolts configured to lock the rotor and stator, a removable bearing sub-assembly having at least one shrunk-on bearing installed, and removable mounting bolts configured to engage the bearing sub-assembly and to allow the removable bearing sub-assembly to be removed when the removable mounting bolts are removed.

  15. Constraining climate model properties using optimal fingerprint detection methods

    E-Print Network [OSTI]

    Forest, Chris Eliot.; Allen, Myles R.; Sokolov, Andrei P.; Stone, Peter H.

    We present a method for constraining key properties of the climate system that are important for climate prediction (climate sensitivity and rate of heat penetration into the deep ocean) by comparing a model's response to ...

  16. Assessing the Potential of Interior Methods for Nonlinear Optimization

    E-Print Network [OSTI]

    2 Electrical and Computer Engineering Department, Northwestern University, ... A variety of interior (or barrier) methods for nonlinear programming have ...... Mathematics and Computer Science Technical Report ANL/MCS-246, Argonne.

  17. Alternating direction methods for non convex optimization with ...

    E-Print Network [OSTI]

    Xi Bai

    2015-02-11T23:59:59.000Z

    Feb 11, 2015 ... tion method (PLM), presented in Algorithm 5. The term partial is in a sense that only one block of variables is linearized. In the next section, we...

  18. Randomized coordinate descent methods for big data optimization

    E-Print Network [OSTI]

    Takac, Martin

    2014-07-01T23:59:59.000Z

    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 ...

  19. XFEL diffraction: developing processing methods tooptimize data quality

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

    Sauter, Nicholas K.

    2015-03-01T23:59:59.000Z

    Serial crystallography, using either femtosecond X-ray pulses from free-electron laser sources or short synchrotron-radiation exposures, has the potential to reveal metalloprotein structural details while minimizing damage processes. However, deriving a self-consistent set of Bragg intensities from numerous still-crystal exposures remains a difficult problem, with optimal protocols likely to be quite different from those well established for rotation photography. Here several data processing issues unique to serial crystallography are examined. It is found that the limiting resolution differs for each shot, an effect that is likely to be due to both the sample heterogeneity and pulse-to-pulse variation in experimental conditions. Shotsmorewith lower resolution limits produce lower-quality models for predicting Bragg spot positions during the integration step. Also, still shots by their nature record only partial measurements of the Bragg intensity. An approximate model that corrects to the full-spot equivalent (with the simplifying assumption that the X-rays are monochromatic) brings the distribution of intensities closer to that expected from an ideal crystal, and improves the sharpness of anomalous difference Fourier peaks indicating metal positions.less

  20. Epsilon-net method for optimizations over separable states

    E-Print Network [OSTI]

    Yaoyun Shi; Xiaodi Wu

    2011-12-04T23:59:59.000Z

    We give algorithms for the optimization problem: $\\max_\\rho \\ip{Q}{\\rho}$, where $Q$ is a Hermitian matrix, and the variable $\\rho$ is a bipartite {\\em separable} quantum state. This problem lies at the heart of several problems in quantum computation and information, such as the complexity of QMA(2). While the problem is NP-hard, our algorithms are better than brute force for several instances of interest. In particular, they give PSPACE upper bounds on promise problems admitting a QMA(2) protocol in which the verifier performs only logarithmic number of elementary gate on both proofs, as well as the promise problem of deciding if a bipartite local Hamiltonian has large or small ground energy. For $Q\\ge0$, our algorithm runs in time exponential in $\\|Q\\|_F$. While the existence of such an algorithm was first proved recently by Brand{\\~a}o, Christandl and Yard [{\\em Proceedings of the 43rd annual ACM Symposium on Theory of Computation}, 343--352, 2011], our algorithm is conceptually simpler.

  1. Optimization Online - All Areas Submissions - January 2015

    E-Print Network [OSTI]

    Partially Adaptive Stochastic Optimization for Electric Power Generation Expansion ... Object-Parallel Infrastructure for Implementing First-Order Methods, with an...

  2. Method of generating hydrogen gas from sodium borohydride

    DOE Patents [OSTI]

    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

    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.

  3. Generation IV PR and PP Methods and Applications

    SciTech Connect (OSTI)

    Bari,R.A.

    2008-10-13T23:59:59.000Z

    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.

  4. Method of optimizing performance of Rankine cycle power plants

    DOE Patents [OSTI]

    Pope, William L. (Walnut Creek, CA); Pines, Howard S. (El Cerrito, CA); Doyle, Padraic A. (Oakland, CA); Silvester, Lenard F. (Richmond, CA)

    1982-01-01T23:59:59.000Z

    A method for efficiently operating a Rankine cycle power plant (10) to maximize fuel utilization efficiency or energy conversion efficiency or minimize costs by selecting a turbine (22) fluid inlet state which is substantially in the area adjacent and including the transposed critical temperature line (46).

  5. An adaptive accelerated first-order method for convex optimization

    E-Print Network [OSTI]

    Renato D.C MonteiroSchool of Industrial and Systems Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0205 (email:monteiro@isye.gatech.edu). The work of this author was partially supported by NSF Grants CMMI-0900094 and CMMI-1300221, and ONR Grant ONR N00014-11-1-0062. Camilo OrtizSchool of Industrial and Systems Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0205 (email: camiort@gatech.edu). Benar F. SvaiterIMPA, Estrada Dona Castorina 110, 22460-320 Rio de Janeiro, Brazil (email:benar@impa.br). The work of this author was partially supported by CNPq grants no. 303583/2008-8, 302962/2011-5, 480101/2008-6, 474944/2010-7, FAPERJ grants E-26/102.821/2008, E-26/102.940/2011.

    2014-05-28T23:59:59.000Z

    May 14, 2014 ... 0.5. 0.6. 0.7. 0.8. 0.9. 1. Performance Profiles (60 CQP instances) tol=10-6 (time) at most x x (the time of the other methods). % of problems.

  6. Inverse-design and optimization methods for centrifugal pump impellers

    E-Print Network [OSTI]

    Twente, Universiteit

    to be incompressible. As such, these methods are applicable to pumps, fans and hydraulic turbines. Furthermore details can lead to large changes in performance, like resulting head, efficiency and cavitation as input and the flow field and the performance are obtained as a result. In contrast, for an inverse

  7. A Surface Reconstruction Method Using Global Graph Cut Optimization

    E-Print Network [OSTI]

    Paris-Sud XI, Université de

    SAR (China) 1sparis@csail.mit.edu ­ Sylvain Paris has worked on this project during his PhD at ARTIS reconstruction from multiple calibrated images mainly has been approached using local methods, either to 1/10th of a pixel. Index Terms Graph flow, graph cut, 3D reconstruction from calibrated cameras

  8. Simplex Method in Matrix Form Sensitivity Analysis in Matrix Form Math 364: Principles of Optimization, Lectures

    E-Print Network [OSTI]

    Li, Haijun

    Simplex Method in Matrix Form Sensitivity Analysis in Matrix Form Math 364: Principles Spring 2012 Haijun Li Math 364: Principles of Optimization, Lectures 14-15 Spring 2012 1 / 24 #12;Simplex, Lectures 14-15 Spring 2012 2 / 24 #12;Simplex Method in Matrix Form Sensitivity Analysis in Matrix Form

  9. A SPOTLIGHT SEARCH METHOD FOR MULTI-CRITERIA OPTIMIZATION PROBLEMS Jung-Ho Lewe

    E-Print Network [OSTI]

    Coello, Carlos A. Coello

    -criteria optimization (MCO) prob- lem, in general, is a difficult practice. Numerous meth- ods have been proposed and applied to various applica- tions over the past few decades. This paper introduces a new MCO method suitable for continuous, nonlinear MCO problems. The concept of the proposed method, a spotlight search

  10. Comparison of Global Optimization Methods for Drag Reduction in the Automotive Industry

    E-Print Network [OSTI]

    Dumas, Laurent

    Comparison of Global Optimization Methods for Drag Reduction in the Automotive Industry Laurent reduction problems in the automotive industry. All the methods consist in improving classical genetic of a GA is reduced by a factor up to 7. 1 Introduction The topic of drag reduction in the automotive

  11. Adaptive finite element methods for PDE-constrained optimal control problems

    E-Print Network [OSTI]

    Adaptive finite element methods for PDE-constrained optimal control problems R. Becker1 , M. Braack is discretized by a finite element Galerkin method. The accuracy of the discretization is controlled by residual of heat transfer, fluid flow and parameter estimation. The contents of this article is as follows

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

    DOE Patents [OSTI]

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

    2011-10-18T23:59:59.000Z

    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.

  13. Phase field method to optimize dielectric devices for electromagnetic wave propagation

    SciTech Connect (OSTI)

    Takezawa, Akihiro, E-mail: akihiro@hiroshima-u.ac.jp; Kitamura, Mitsuru, E-mail: kitamura@naoe.hiroshima-u.ac.jp

    2014-01-15T23:59:59.000Z

    We discuss a phase field method for shape optimization in the context of electromagnetic wave propagation. The proposed method has the same functional capabilities as the level set method for shape optimization. The first advantage of the method is the simplicity of computation, since extra operations such as re-initialization of functions are not required. The second is compatibility with the topology optimization method due to the similar domain representation and the sensitivity analysis. Structural shapes are represented by the phase field function defined in the design domain, and this function is optimized by solving a time-dependent reaction diffusion equation. The artificial double-well potential function used in the equation is derived from sensitivity analysis. We study four types of 2D or 2.5D (axisymmetric) optimization problems. Two are the classical problems of photonic crystal design based on the Bloch theory and photonic crystal wave guide design, and two are the recent topics of designing dielectric left-handed metamaterials and dielectric ring resonators.

  14. System and method for generating current by selective electron heating

    DOE Patents [OSTI]

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

    1984-01-01T23:59:59.000Z

    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.

  15. Method of inhibiting dislocation generation in silicon dendritic webs

    DOE Patents [OSTI]

    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

    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.

  16. A Pliant Method for Anisotropic Mesh Generation Frank J. Bossen

    E-Print Network [OSTI]

    California at Berkeley, University of

    elements conform well to the requested shape metric. The method appears particularly well suited to surface- ysis, heat transfer, fluid flow, electromagnetics, computer graphics, and other applications. It should interface that allows it to be used inside an adaptive finite element solver or in other contexts. allows

  17. Systems and methods for generation of hydrogen peroxide vapor

    DOE Patents [OSTI]

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

    2014-12-02T23:59:59.000Z

    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.

  18. Electrochemical methods for generation of a biological proton motive force

    DOE Patents [OSTI]

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

    2008-12-02T23:59:59.000Z

    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.

  19. Externally pressurized porous cylinder for multiple surface aerosol generation and method of generation

    DOE Patents [OSTI]

    Apel, C.T.; Layman, L.R.; Gallimore, D.L.

    1988-05-10T23:59:59.000Z

    A nebulizer is described for generating aerosol having small droplet sizes and high efficiency at low sample introduction rates. The nebulizer has a cylindrical gas permeable active surface. A sleeve is disposed around the cylinder and gas is provided from the sleeve to the interior of the cylinder formed by the active surface. In operation, a liquid is provided to the inside of the gas permeable surface. The gas contacts the wetted surface and forms small bubbles which burst to form an aerosol. Those bubbles which are large are carried by momentum to another part of the cylinder where they are renebulized. This process continues until the entire sample is nebulized into aerosol sized droplets. 2 figs.

  20. Biological optimization systems for enhancing photosynthetic efficiency and methods of use

    DOE Patents [OSTI]

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

    2012-11-06T23:59:59.000Z

    Biological optimization systems for enhancing photosynthetic efficiency and methods of use. Specifically, methods for enhancing photosynthetic efficiency including applying pulsed light to a photosynthetic organism, using a chlorophyll fluorescence feedback control system to determine one or more photosynthetic efficiency parameters, and adjusting one or more of the photosynthetic efficiency parameters to drive the photosynthesis by the delivery of an amount of light to optimize light absorption of the photosynthetic organism while providing enough dark time between light pulses to prevent oversaturation of the chlorophyll reaction centers are disclosed.

  1. Selecting fines recycle methods to optimize fluid bed combustor performance

    SciTech Connect (OSTI)

    Rickman, W.S.; Fields, D.E.; Brimhall, W.L.; Callahan, S.F.

    1980-05-01T23:59:59.000Z

    Testing and analysis of a number of different fines recycle methods for fluid bed combustors has led to a generalized modeling technique. This model accounts for the effect of pertinent variables in determining overall combustion efficiencies. Computer application of this model has allowed trade-off studies to be performed that show the overall process effects of changes in individual operating parameters. Verification of the model has been accomplished in processing campaigns while combusting fuels such as graphite and bituminous coal. A 0.4 MW test unit was used for the graphite experimental work. Solid fuel was typically crushed to 5 mm maximum screen size. Bed temperatures were normally controlled at 900/sup 0/C; the combustor was an atmospheric unit with maximum in-bed pressures of 0.2 atm. Expanded bed depths ranged from 1.5 to 3 meters. Additional data was taken from recycle tests sponsored by EPRI on the B and W 6 ft x 6 ft fluid bed combustor. These tests used high sulfur coal in a 1.2 meter deep, 850/sup 0/C atmospheric fluidized bed of limestone, with low recycle rates and temperatures. Close agreement between the model and test data has been noted, with combustion efficiency predictions matching experimental results within 1%.

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

    DOE Patents [OSTI]

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

    2014-11-11T23:59:59.000Z

    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.

  3. Direct optimization of the atomic-orbital density matrix using the conjugate-gradient method with a multilevel preconditioner

    E-Print Network [OSTI]

    Helgaker, Trygve

    Direct optimization of the atomic-orbital density matrix using the conjugate-gradient method. The optimization of the density matrix is carried out by the conjugate-gradient method with a multilevel-functional methods that are able to treat large systems such as proteins and other mol- ecules of biological interest

  4. A derivative-free optimization method to compute scalar perturbation of AdS black holes

    E-Print Network [OSTI]

    Rodrigo S. Lima; Alan B. Pavan

    2014-03-25T23:59:59.000Z

    In this work we describe an interesting application of a simple derivative-free optimization method to extract the quasinormal modes (QNM's) of a massive scalar field propagating in a 4-dimensional Schwarzschild anti-de Sitter black hole (Sch-AdS$_4$). In this approach, the problem to find the QNM's is reduced to minimize a real valued function of two variables and does not require any information about derivatives. In fact, our strategy requires only evaluations of the objective function to search global minimizers of the optimization problem. Firstly, numerical experiments were performed to find the QNM's of a massless scalar field propagating in intermediate and large Sch-AdS$_4$ black holes. The performance of this optimization algorithm was compared with other numerical methods used in previous works. Our results showed to be in good agreement with those obtained previously. Finally, the massive scalar field case and its QNM's were also obtained and discussed.

  5. Efficient generation and optimization of stochastic template banks by a neighboring cell algorithm

    E-Print Network [OSTI]

    Henning Fehrmann; Holger J. Pletsch

    2014-11-17T23:59:59.000Z

    Placing signal templates (grid points) as efficiently as possible to cover a multi-dimensional parameter space is crucial in computing-intensive matched-filtering searches for gravitational waves, but also in similar searches in other fields of astronomy. To generate efficient coverings of arbitrary parameter spaces, stochastic template banks have been advocated, where templates are placed at random while rejecting those too close to others. However, in this simple scheme, for each new random point its distance to every template in the existing bank is computed. This rapidly increasing number of distance computations can render the acceptance of new templates computationally prohibitive, particularly for wide parameter spaces or in large dimensions. This work presents a neighboring cell algorithm that can dramatically improve the efficiency of constructing a stochastic template bank. By dividing the parameter space into sub-volumes (cells), for an arbitrary point an efficient hashing technique is exploited to obtain the index of its enclosing cell along with the parameters of its neighboring templates. Hence only distances to these neighboring templates in the bank are computed, massively lowering the overall computing cost, as demonstrated in simple examples. Furthermore, we propose a novel method based on this technique to increase the fraction of covered parameter space solely by directed template shifts, without adding any templates. As is demonstrated in examples, this method can be highly effective..

  6. An Electron Beam Method for Creating Combina-torial Libraries: Application to Next Generation

    E-Print Network [OSTI]

    Wadley, Haydn

    , VA 22903 U.S.A. The next generation of thermal barriers coating (TBC) systems used on turbine engines8-1 An Electron Beam Method for Creating Combina- torial Libraries: Application to Next Generation. The underlying bond coat layers should have substantially improved oxidation resistance and increased high

  7. SOLVING GENERATION EXPANSION PLANNING PROBLEMS WITH ENVIRONMENTAL CONSTRAINTS BY A BUNDLE METHOD

    E-Print Network [OSTI]

    Solodov, Mikhail V.

    for the construction of new power plants, while ensuring economic and reliable supply to the future electricity demandSOLVING GENERATION EXPANSION PLANNING PROBLEMS WITH ENVIRONMENTAL CONSTRAINTS BY A BUNDLE METHOD discuss the energy generation expansion planning with environmental constraints, formulated as a nonsmooth

  8. Improved method for calculating the radiation heat generation in the BOR-60 reactor

    SciTech Connect (OSTI)

    Varivtsev, A. V., E-mail: vav3@niiar.ru; Zhemkov, I. Yu. [JSC SSC RIAR, Dimitrovgrad-10 (Russian Federation)

    2014-12-15T23:59:59.000Z

    The results of theoretical and experimental studies aimed at determining the radiation heat generation in the BOR-60 reactor reveal the drawbacks of the computational methods used at present. An algorithm that is free from these drawbacks and allows one to determine the radiation heat generation computationally is proposed.

  9. Optimized Waveform Relaxation Methods for the Longitudinal Partitioning of Transmission Lines

    E-Print Network [OSTI]

    Gander, Martin J.

    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

  10. Performance of Enriched Methods for Large Scale Unconstrained Optimization as applied to

    E-Print Network [OSTI]

    Aluffi, Paolo

    atoms. It is shown that for the optimal parameters, the hybrid approach is typically 2 times more of the hybrid approach increases as the non-linearity of the energy function is enhanced, i.e., in going from =2 and error calculations for each problem. Keywords: energy minimization; proteins; loops; hybrid method

  11. A Pareto-Optimal Refinement Method for Protein Design Lucas Gregorio Nivo n1.

    E-Print Network [OSTI]

    Baker, David

    Moretti1. , David Baker1,2 * 1 Department of Biochemistry, University of Washington, Seattle, Washington, United States of America, 2 Howard Hughes Medical Institute (HHMI), University of Washington, Seattle for functional site design. Citation: Nivon LG, Moretti R, Baker D (2013) A Pareto-Optimal Refinement Method

  12. Multiobjective Optimization Techniques: A Study Of The Energy Minimization Method And Its Application To The

    E-Print Network [OSTI]

    Coello, Carlos A. Coello

    Multiobjective Optimization Techniques: A Study Of The Energy Minimization Method And Its, Rio de Janeiro, RJ, Brazil, 22453-900 Rio de Janeiro, RJ, Brazil, 22453-900 +55-21-529-9433 +55@brain.jpl.nasa.gov Rua Marques de S. Vicente, 225, Gavea, Rio de Janeiro, RJ, Brazil, 22453-900 +55-21-529-9445 marley

  13. A Conformal Mapping Grid Generation Method for Modeling High-Fidelity Aeroelastic Simulations

    E-Print Network [OSTI]

    Worley, Gregory

    2010-07-14T23:59:59.000Z

    A CONFORMAL MAPPING GRID GENERATION METHOD FOR MODELING HIGH-FIDELITY AEROELASTIC SIMULATIONS A Thesis by GREGORY DORWAY WORLEY Submitted to the O ce of Graduate Studies of Texas A&M University in partial ful llment of the requirements... for the degree of MASTER OF SCIENCE May 2010 Major Subject: Aerospace Engineering A CONFORMAL MAPPING GRID GENERATION METHOD FOR MODELING HIGH-FIDELITY AEROELASTIC SIMULATIONS A Thesis by GREGORY DORWAY WORLEY Submitted to the O ce of Graduate Studies of Texas A...

  14. Optimizations enabling transformations and code generation for th HP V class

    E-Print Network [OSTI]

    Carvallo de Ochoa, Julio Antonio

    2000-01-01T23:59:59.000Z

    and unique issues involved in the implementation of the code generation back-end for the HP V class multiprocessor....

  15. Generator-Absorber heat exchange transfer apparatus and method using an intermediate liquor

    DOE Patents [OSTI]

    Phillips, Benjamin A. (Benton Harbor, MI); Zawacki, Thomas S. (St. Joseph, MI)

    1996-11-05T23:59:59.000Z

    Numerous embodiments and related methods for generator-absorber heat exchange (GAX) are disclosed, particularly for absorption heat pump systems. Such embodiments and related methods use the working solution of the absorption system for the heat transfer medium where the working solution has an intermediate liquor concentration.

  16. Method for generating high-energy and high repetition rate laser pulses from CW amplifiers

    DOE Patents [OSTI]

    Zhang, Shukui

    2013-06-18T23:59:59.000Z

    A method for obtaining high-energy, high repetition rate laser pulses simultaneously using continuous wave (CW) amplifiers is described. The method provides for generating micro-joule level energy in pico-second laser pulses at Mega-hertz repetition rates.

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

    SciTech Connect (OSTI)

    Stone, M. E.

    2012-11-07T23:59:59.000Z

    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.

  18. Optimal suppression of defect generation during a passage across a quantum critical point

    E-Print Network [OSTI]

    Ning Wu; Arun Nanduri; Herschel Rabitz

    2014-12-09T23:59:59.000Z

    The dynamics of quantum phase transitions are inevitably accompanied by the formation of defects when crossing a quantum critical point. For a generic class of quantum critical systems, we solve the problem of minimizing the production of defects through the use of a gradient-based deterministic optimal control algorithm. By considering a finite size quantum Ising model with a tunable global transverse field, we show that an optimal power law quench of the transverse field across the Ising critical point works well at minimizing the number of defects, in spite of being drawn from a subset of quench profiles. These power law quenches are shown to be inherently robust against noise. The optimized defect density exhibits a transition at a critical ratio of the quench duration to the system size, which we argue coincides with the intrinsic speed limit for quantum evolution.

  19. Preliminary verification of online optimization of the luminosity of BEPCII by using the robust conjugate direction search method

    E-Print Network [OSTI]

    Ji, Hong-Fei; Wang, Sheng; Ji, Da-Heng; Yu, Cheng-Hui; Zhang, Yuan; Huang, Xiao-Biao

    2015-01-01T23:59:59.000Z

    The robust conjugate direction search (RCDS) method has high tolerance to noise in beam experiments, and it is an efficient experimental technique for online optimization with multi-dimensional variables. In our study, this method is applied on BEPC-II, an electron-position collider, to optimize the luminosity, which can be considered as a multivariable function. Several variables are considered, including horizontal displacement, horizontal angular deviation, vertical displacement and vertical angular deviation at the interaction point. To verify the feasibility and practicability of the online optimization at the collider, the objective function, optimization time and experimental applications require careful consideration. Results from numerical simulation and online optimization experiments with RCDS are presented. The effectiveness of this method in online optimization at a collider is preliminarily verified.

  20. Electrode assemblies, plasma apparatuses and systems including electrode assemblies, and methods for generating plasma

    DOE Patents [OSTI]

    Kong, Peter C; Grandy, Jon D; Detering, Brent A; Zuck, Larry D

    2013-09-17T23:59:59.000Z

    Electrode assemblies for plasma reactors include a structure or device for constraining an arc endpoint to a selected area or region on an electrode. In some embodiments, the structure or device may comprise one or more insulating members covering a portion of an electrode. In additional embodiments, the structure or device may provide a magnetic field configured to control a location of an arc endpoint on the electrode. Plasma generating modules, apparatus, and systems include such electrode assemblies. Methods for generating a plasma include covering at least a portion of a surface of an electrode with an electrically insulating member to constrain a location of an arc endpoint on the electrode. Additional methods for generating a plasma include generating a magnetic field to constrain a location of an arc endpoint on an electrode.

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

    DOE Patents [OSTI]

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

    2013-10-01T23:59:59.000Z

    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.

  2. Optimized Generation of Data-Path from C Codes for FPGAs

    E-Print Network [OSTI]

    Guo, Zhi; Najjar, Walid; Vissers, Kees

    2011-01-01T23:59:59.000Z

    FPGAs, as computing devices, offer significant speedup over microprocessors. Furthermore, their configurability offers an advantage over traditional ASICs. However, they do not yet enjoy high-level language programmability, as microprocessors do. This has become the main obstacle for their wider acceptance by application designers. ROCCC is a compiler designed to generate circuits from C source code to execute on FPGAs, more specifically on CSoCs. It generates RTL level HDLs from frequently executing kernels in an application. In this paper, we describe ROCCC's system overview and focus on its data path generation. We compare the performance of ROCCC-generated VHDL code with that of Xilinx IPs. The synthesis result shows that ROCCC-generated circuit takes around 2x ~ 3x area and runs at comparable clock rate.

  3. DeltaSky: Optimal Maintenance of Skyline Deletions without Exclusive Dominance Region Generation

    E-Print Network [OSTI]

    Egecioglu, ?mer

    of the so called exclusive dominance region (EDR) to achieve optimal I/O performance for deletion maintenance. However, the shape of an EDR becomes extremely complex in higher dimensions, and algorithms for its computation have not been developed. We derive a systematic way to decompose a d-dimensional EDR

  4. Fusion rules and the Patera-Sharp generating-function method

    E-Print Network [OSTI]

    L. Begin; C. Cummins; P. Mathieu; M. A. Walton

    2002-10-18T23:59:59.000Z

    We review some contributions on fusion rules that were inspired by the work of Sharp, in particular, the generating-function method for tensor-product coefficients that he developed with Patera. We also review the Kac-Walton formula, the concepts of threshold level, fusion elementary couplings, fusion generating functions and fusion bases. We try to keep the presentation elementary and exemplify each concept with the simple $\\su(2)_k$ case.

  5. Communication systems, transceivers, and methods for generating data based on channel characteristics

    DOE Patents [OSTI]

    Forman, Michael A; Young, Derek

    2012-09-18T23:59:59.000Z

    Examples of methods for generating data based on a communications channel are described. In one such example, a processing unit may generate a first vector representation based in part on at least two characteristics of a communications channel. A constellation having at least two dimensions may be addressed with the first vector representation to identify a first symbol associated with the first vector representation. The constellation represents a plurality of regions, each region associated with a respective symbol. The symbol may be used to generate data, which may stored in an electronic storage medium and used as a cryptographic key or a spreading code or hopping sequence in a modulation technique.

  6. Tensor product methods and entanglement optimization for ab initio quantum chemistry

    E-Print Network [OSTI]

    Szilrd Szalay; Max Pfeffer; Valentin Murg; Gergely Barcza; Frank Verstraete; Reinhold Schneider; rs Legeza

    2014-12-18T23:59:59.000Z

    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.

  7. Optimization Online Digest -- March 2008

    E-Print Network [OSTI]

    Tractable Robust Expected Utility and Risk Models for Portfolio Optimization ... of a semidefinite programming solver based on CSDP on a distributed memory cluster ... Epi-convergent Scenario Generation Method for Stochastic Problems via...

  8. Generation of pseudostates for the Dirac-Coulomb Hamiltonian using the variational method

    E-Print Network [OSTI]

    Kim, Yong-Dal

    1989-01-01T23:59:59.000Z

    GENERATION OF PSEUDOSTATES FOR THE DIRAC-COULOMB HAMILTONIAN USING THE VARIATIONAL METHOD A Thes&s YOUNG-DAL IfIXI Submitted to the 0%ce of Graduate Studies of Texas Aklti Ilmvcrsity in partial fulfrllment of' the requirements for the degree... of ltIASTER OF SGIEXCE May 1989 XIajor Subject, : Physics GENERATION OF PSEUDOSTATES FOR THE DIRAC-COULOMB HAMILTONIAN USING THE VARIATIONAL METHOD A Thesis YCING-DAL HIM Approved as to style and content, by: NL)4h Albert L. Ford (Chair...

  9. Computational method and system for modeling, analyzing, and optimizing DNA amplification and synthesis

    DOE Patents [OSTI]

    Vandersall, Jennifer A.; Gardner, Shea N.; Clague, David S.

    2010-05-04T23:59:59.000Z

    A computational method and computer-based system of modeling DNA synthesis for the design and interpretation of PCR amplification, parallel DNA synthesis, and microarray chip analysis. The method and system include modules that address the bioinformatics, kinetics, and thermodynamics of DNA amplification and synthesis. Specifically, the steps of DNA selection, as well as the kinetics and thermodynamics of DNA hybridization and extensions, are addressed, which enable the optimization of the processing and the prediction of the products as a function of DNA sequence, mixing protocol, time, temperature and concentration of species.

  10. DEVELOPMENT OF ANALYTICAL METHODS FOR DETERMINING SUPPRESSOR CONCENTRATION IN THE MCU NEXT GENERATION SOLVENT (NGS)

    SciTech Connect (OSTI)

    Taylor-Pashow, K.; Fondeur, F.; White, T.; Diprete, D.; Milliken, C.

    2013-07-31T23:59:59.000Z

    Savannah River National Laboratory (SRNL) was tasked with identifying and developing at least one, but preferably two methods for quantifying the suppressor in the Next Generation Solvent (NGS) system. The suppressor is a guanidine derivative, N,N',N"-tris(3,7-dimethyloctyl)guanidine (TiDG). A list of 10 possible methods was generated, and screening experiments were performed for 8 of the 10 methods. After completion of the screening experiments, the non-aqueous acid-base titration was determined to be the most promising, and was selected for further development as the primary method. {sup 1}H NMR also showed promising results from the screening experiments, and this method was selected for further development as the secondary method. Other methods, including {sup 36}Cl radiocounting and ion chromatography, also showed promise; however, due to the similarity to the primary method (titration) and the inability to differentiate between TiDG and TOA (tri-n-ocytlamine) in the blended solvent, {sup 1}H NMR was selected over these methods. Analysis of radioactive samples obtained from real waste ESS (extraction, scrub, strip) testing using the titration method showed good results. Based on these results, the titration method was selected as the method of choice for TiDG measurement. {sup 1}H NMR has been selected as the secondary (back-up) method, and additional work is planned to further develop this method and to verify the method using radioactive samples. Procedures for analyzing radioactive samples of both pure NGS and blended solvent were developed and issued for the both methods.

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

    E-Print Network [OSTI]

    Kusiak, Andrew

    operating a variable-speed wind turbine with pitch control to maximize power while minimizing the loads prediction, power ramp rate, data mining, wind turbine operation strategy, generator torque, blade pitch1 Abstract--A bi-objective optimization model of power and power changes generated by a wind

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

    DOE Patents [OSTI]

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

    1998-07-14T23:59:59.000Z

    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.

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

    DOE Patents [OSTI]

    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

    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.

  14. Appeared in Proceedings of First International ACM/IEEE Symposium on Code Generation and Optimization, 2003 Optimizing Memory Accesses For Spatial Computation

    E-Print Network [OSTI]

    Budiu, Mihai

    many efficient and powerful optimizations it cannot be easily applied in the presence of pointers and Optimization, 2003 Optimizing Memory Accesses For Spatial Computation Mihai Budiu and Seth C. Goldstein present the internal representation and optimizations used by the CASH compiler for improving the memory

  15. Revised methods for few-group cross sections generation in the Serpent Monte Carlo code

    SciTech Connect (OSTI)

    Fridman, E. [Reactor Safety Div., Helmholz-Zentrum Dresden-Rossendorf, POB 51 01 19, Dresden, 01314 (Germany); Leppaenen, J. [VTT Technical Research Centre of Finland, POB 1000, FI-02044 VTT (Finland)

    2012-07-01T23:59:59.000Z

    This paper presents new calculation methods, recently implemented in the Serpent Monte Carlo code, and related to the production of homogenized few-group constants for deterministic 3D core analysis. The new methods fall under three topics: 1) Improved treatment of neutron-multiplying scattering reactions, 2) Group constant generation in reflectors and other non-fissile regions and 3) Homogenization in leakage-corrected criticality spectrum. The methodology is demonstrated by a numerical example, comparing a deterministic nodal diffusion calculation using Serpent-generated cross sections to a reference full-core Monte Carlo simulation. It is concluded that the new methodology improves the results of the deterministic calculation, and paves the way for Monte Carlo based group constant generation. (authors)

  16. Subtask 1.24 - Optimization of Cooling Water Resources for Power Generation

    SciTech Connect (OSTI)

    Daniel Stepan; Richard Shockey; Bethany Kurz; Wesley Peck

    2009-03-31T23:59:59.000Z

    The Energy & Environmental Research Center (EERC) has developed an interactive, Web-based decision support system (DSS{copyright} 2007 EERC Foundation) to provide power generation utilities with an assessment tool to address water supply issues when planning new or modifying existing generation facilities. The Web-based DSS integrates water and wastewater treatment technology and water law information with a geographic information system-based interactive map that links to state and federal water quality and quantity databases for North Dakota, South Dakota, Minnesota, Wyoming, Montana, Nebraska, Wisconsin, and Iowa.

  17. Liquid chromatographic method for determination of water in soils and the optimization of anion separations by capillary zone electrophoresis

    SciTech Connect (OSTI)

    Benz, N.

    1994-10-01T23:59:59.000Z

    A liquid chromatographic method for the determination of water in soil or clay samples is presented. In a separate study, the optimization of electrophoretic separation of alkylated phenolate ions was optimized by varying the pH and acetonitrile concentration of the buffer solutions.

  18. Optimization of a Microscale, Axial-Flux, Permanent-Magnet Generator D. P. Arnold1*

    E-Print Network [OSTI]

    -phase, axial- flux, PM machine, consisting of a stator with Cu surface windings and a multi-pole SmCo PM rotor of the overall machine geometry and stator winding patterns. 2. MACHINE OVERVIEW The generator is a three back iron and a stator with Cu surface windings on a magnetically soft substrate, which serves

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

    SciTech Connect (OSTI)

    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

    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)

  20. Design and optimization of a bi-axial vibration-driven electromagnetic generator

    SciTech Connect (OSTI)

    Yang, Jin, E-mail: yangjin@cqu.edu.cn; Yu, Qiangmo; Zhao, Jiangxin; Zhao, Nian; Wen, Yumei; Li, Ping; Qiu, Jing [Department of Optoelectronic Engineering, Research Center of Sensors and Instruments, Chongqing University, Chongqing 400044 (China)

    2014-09-21T23:59:59.000Z

    To scavenge energy from ambient vibrations with arbitrary in-plane motion directions and over a wide frequency range, a novel electromagnetic vibration energy harvester is designed and optimized. In the harvester, a circular cross-section elastic rod, not a traditional thin cantilever beam, is used to extract ambient vibration energy because of its capability to collect vibration from arbitrary in-plane motion directions. The magnetic interaction between magnets and the iron core contributes to a nonlinear oscillation of the rod with increased frequency bandwidth. The influences of the structure configurations on the electrical output and the working bandwidth of the harvester are investigated using Ansoft's Maxwell 3D to achieve optimal performance. The experimental results show that the harvester is sensitive to vibrations from arbitrary in-plane directions and it exhibits a bandwidth of 5.7 Hz and a maximum power of 13.4 mW at an acceleration of 0.6 g (with g=9.8 ms?).

  1. 15.093 / 2.098 Optimization Methods (SMA 5213), Fall 2004

    E-Print Network [OSTI]

    Bertsimas, Dimitris

    This course introduces the principal algorithms for linear, network, discrete, nonlinear, dynamic optimization and optimal control. Emphasis is on methodology and the underlying mathematical structures. Topics include the ...

  2. Optimization Methods and Software Vol. 00, No. 00, Month 200x, 118

    E-Print Network [OSTI]

    Berger-Wolf, Tanya Y.

    Optimization, DNA markers, Linear Assignment Problems Corresponding author. Department of Industrial studied mathematical programming models in combinatorial optimization for several important real world

  3. Mixture-process variable approach to optimize a microemulsion electrokinetic chromatography method for the quality control of a nutraceutical based on coenzyme Q10

    SciTech Connect (OSTI)

    Piepel, Gregory F.; Pasquini, Benedetta; Cooley, Scott K.; Heredia-Langner, Alejandro; Orlandini, Serena; Furlanetto, Sandra

    2012-08-15T23:59:59.000Z

    In recent years, multivariate optimization has played an increasing role in analytical method development. ICH guidelines recommend using statistical design of experiments to identify the design space, in which multivariate combinations of composition variables and process variables have been demonstrated to provide quality results. Considering a microemulsion electrokinetic chromatography method (MEEKC), the performance of the electrophoretic run depends on the proportions of mixture components (MCs) of the microemulsion and on the values of process variables (PVs). In the present work, for the first time in the literature, a mixture-process variable (MPV) approach was applied to optimize a MEEKC method for the analysis of coenzyme Q10 (Q10), ascorbic acid (AA), and folic acid (FA) contained in nutraceuticals. The MCs (buffer, surfactant-cosurfactant, oil) and the PVs (voltage, buffer concentration, buffer pH) were simultaneously changed according to a MPV experimental design. A 62-run MPV design was generated using the I-optimality criterion, assuming a 46-term MPV model allowing for special-cubic blending of the MCs, quadratic effects of the PVs, and some MC-PV interactions. The obtained data were used to develop MPV models that express the performance of an electrophoretic run (measured as peak efficiencies of Q10, AA, and FA) in terms of the MCs and PVs. Contour and perturbation plots were drawn for each of the responses. Finally, the MPV models and criteria for the peak efficiencies were used to develop the design space and an optimal subregion (i.e., the settings of the mixture MCs and PVs that satisfy the respective criteria), as well as a unique optimal combination of MCs and PVs.

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

    SciTech Connect (OSTI)

    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

    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.

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

    DOE Patents [OSTI]

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

    2013-10-01T23:59:59.000Z

    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.

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

    SciTech Connect (OSTI)

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

    2013-04-01T23:59:59.000Z

    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.

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

    E-Print Network [OSTI]

    Pedram, Massoud

    grid technologies. This is a particularly interesting problem with the use of dynamic energy pricing method to solve this problem is dynamic energy pricing [2]-[10]. Dynamic changes in energy prices provide the customers' peak-hour demands. So, dynamic energy pricing can benefit both the consumer and the producer

  8. Constrained Multi-Objective Optimization Using Steady State Genetic Algorithms

    E-Print Network [OSTI]

    Rasheed, Khaled

    evaluations in an optimization. For such problems steady state GAs may perform better than generational GAs constrained multi-objective optimization problems using steady state GAs. These methods are intended method called Objective Exchange Genetic Algorithm for Design Optimization (OEGADO) runs several GAs

  9. Generator-absorber-heat exchange heat transfer apparatus and method and use thereof in a heat pump

    DOE Patents [OSTI]

    Phillips, Benjamin A. (Benton Harbor, MI); Zawacki, Thomas S. (St. Joseph, MI); Marsala, Joseph (Glen Ellyn, IL)

    1994-11-29T23:59:59.000Z

    Numerous embodiments and related methods for generator-absorber heat exchange (GAX) are disclosed, particularly for absorption heat pump systems. Such embodiments and related methods use the working solution of the absorption system for the heat transfer medium.

  10. Generator-absorber-heat exchange heat transfer apparatus and method and use thereof in a heat pump

    DOE Patents [OSTI]

    Phillips, Benjamin A. (Benton Harbor, MI); Zawacki, Thomas S. (St. Joseph, MI)

    1998-07-21T23:59:59.000Z

    Numerous embodiments and related methods for generator-absorber heat exchange (GAX) are disclosed, particularly for absorption heat pump systems. Such embodiments and related methods use, as the heat transfer medium, the working fluid of the absorption system taken from the generator at a location where the working fluid has a rich liquor concentration.

  11. Generator-absorber-heat exchange heat transfer apparatus and method and use thereof in a heat pump

    DOE Patents [OSTI]

    Phillips, B.A.; Zawacki, T.S.

    1998-07-21T23:59:59.000Z

    Numerous embodiments and related methods for generator-absorber heat exchange (GAX) are disclosed, particularly for absorption heat pump systems. Such embodiments and related methods use, as the heat transfer medium, the working fluid of the absorption system taken from the generator at a location where the working fluid has a rich liquor concentration. 5 figs.

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

    DOE Patents [OSTI]

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

    1996-01-01T23:59:59.000Z

    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.

  13. Method and apparatus for improving the performance of a nuclear power electrical generation system

    DOE Patents [OSTI]

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

    1995-01-01T23:59:59.000Z

    A method and apparatus for improving the efficiency and performance a of 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 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.

  14. Analyzing of Balancing Authorities Cooperation Methods with High Variable Generation Penetration

    SciTech Connect (OSTI)

    Makarov, Yuri V.; Zhou, Ning; Etingov, Pavel V.; Samaan, Nader A.; Ma, Jian; Diao, Ruisheng; Guttromson, Ross T.

    2010-11-02T23:59:59.000Z

    With the rapidly growing penetration level of wind and solar generation, the challenges of managing variability and the uncertainty of intermittent renewable generation become more and more significant. The problem of power variability and uncertainty gets exacerbated when each balancing authority (BA) works locally and separately to balance its own subsystem. The virtual BA concept is based on various forms of collaboration between individual BAs to manage power variability and uncertainty. The virtual BA will have a wide area control capability in managing its operational balancing requirements in different time frames. This coordination results in the improvement of efficiency and reliability of power system operation while facilitating the high level integration of green, intermittent energy resources. Several strategies for virtual BA implementation, such as Area Control Error (ACE) diversity interchange (ADI), variable generation only BA, BA consolidation, dynamic scheduling, and regulation and load following sharing are discussed in this paper. The objective of such strategies is to allow individual BAs within a large power grid to help each other dealing with power variability. Innovative methods have been developed to simulate the balancing operation of BAs. These methods evaluate the BA operation through a number of metrics such as capacity, ramp rate, ramp duration, energy and cycling requirements to evaluate the performance of different virtual BA strategies.

  15. Multiscale characterization method for line edge roughness based on redundant second generation wavelet transform

    SciTech Connect (OSTI)

    Wang Fei; Zhao Xuezeng [School of Mechanical and Electronic Engineering, Harbin Institute of Technology, Harbin 150001 (China); Li Ning [Shanghai Second Polytechnic University, Shanghai 201209 (China)

    2010-10-15T23:59:59.000Z

    We introduce a multiscale characterization method for line edge roughness (LER) based on redundant second generation wavelet transform. This method involves decomposing LER characteristics into independent bands with different spatial frequency components at different scales, and analyzing the reconstructed signals to work out the roughness exponent, the spatial frequency distribution characteristics, as well as the rms value. The effect of noise can be predicted using detailed signals in the minimum space of scale. This method was applied to numerical profiles for validation. Results show that according to the line edge profiles with similar amplitudes, the roughness exponent R can effectively reflect the degree of irregularity of LER and intuitively provide information on LER spatial frequency distribution.

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

    DOE Patents [OSTI]

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

    2007-07-10T23:59:59.000Z

    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.

  17. Concentration solar power optimization system and method of using the same

    DOE Patents [OSTI]

    Andraka, Charles E

    2014-03-18T23:59:59.000Z

    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.

  18. Higher-Order Methods for Determining Optimal Controls and Their Sensitivities

    E-Print Network [OSTI]

    McCrate, Christopher M.

    2010-07-14T23:59:59.000Z

    The solution of optimal control problems through the Hamilton-Jacobi-Bellman (HJB) equation offers guaranteed satisfaction of both the necessary and sufficient conditions for optimality. However, finding an exact solution to the HJB equation is a...

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

    E-Print Network [OSTI]

    Oh, Bong T.

    2010-01-16T23:59:59.000Z

    The Multidisciplinary Design Optimization (MDO) system is needed to reduce the developing time and production cost in most industries. The MDO is the new technology for optimization design, and considers solid mechanics, dynamics, kinematics...

  20. CONTINUOUS GRASP WITH A LOCAL ACTIVE-SET METHOD FOR BOUND-CONSTRAINED GLOBAL OPTIMIZATION

    E-Print Network [OSTI]

    Resende, Mauricio G. C.

    . BIRGIN, ERICO M. GOZZI, MAURICIO G.C. RESENDE, AND RICARDO M. A. SILVA Abstract. Global optimization

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

    DOE Patents [OSTI]

    Vella, Michael C. (San Leandro, CA)

    1996-01-01T23:59:59.000Z

    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.

  2. The null space method for selecting optimal measurement combinations as controlled

    E-Print Network [OSTI]

    Skogestad, Sigurd

    is used to obtain temperature combinations for control of a Petlyuk distillation column. Keywords: Process control, Control structure selection, Optimizing control, Un- certainty, Temperature control distillation when using advanced control (e.g. MPC) or real-time optimization (RTO). This paper focuses Optimizer

  3. [SIAM conference on optimization

    SciTech Connect (OSTI)

    Not Available

    1992-05-10T23:59:59.000Z

    Abstracts are presented of 63 papers on the following topics: large-scale optimization, interior-point methods, algorithms for optimization, problems in control, network optimization methods, and parallel algorithms for optimization problems.

  4. Optimization Online - All Areas Submissions - March 2008

    E-Print Network [OSTI]

    ... a semidefinite programming solver based on CSDP on a distributed memory cluster ... Tractable Robust Expected Utility and Risk Models for Portfolio Optimization ... Epi-convergent Scenario Generation Method for Stochastic Problems via...

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

    DOE Patents [OSTI]

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

    2013-05-21T23:59:59.000Z

    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.

  6. System and method for generating a deselect mapping for a focal plane array

    DOE Patents [OSTI]

    Bixler, Jay V; Brandt, Timothy G; Conger, James L; Lawson, Janice K

    2013-05-21T23:59:59.000Z

    A method for generating a deselect mapping for a focal plane array according to one embodiment includes gathering a data set for a focal plane array when exposed to light or radiation from a first known target; analyzing the data set for determining which pixels or subpixels of the focal plane array to add to a deselect mapping; adding the pixels or subpixels to the deselect mapping based on the analysis; and storing the deselect mapping. A method for gathering data using a focal plane array according to another embodiment includes deselecting pixels or subpixels based on a deselect mapping; gathering a data set using pixels or subpixels in a focal plane array that are not deselected upon exposure thereof to light or radiation from a target of interest; and outputting the data set.

  7. The Adjoint Method for The Optimization of Brachytherapy and Radiotherapy Patient Treatment Planning Procedures Using Monte Carlo Calculations

    SciTech Connect (OSTI)

    D.L. Henderson; S. Yoo; M. Kowalok; T.R. Mackie; B.R. Thomadsen

    2001-10-30T23:59:59.000Z

    The goal of this project is to investigate the use of the adjoint method, commonly used in the reactor physics community, for the optimization of radiation therapy patient treatment plans. Two different types of radiation therapy are being examined, interstitial brachytherapy and radiotherapy. In brachytherapy radioactive sources are surgically implanted within the diseased organ such as the prostate to treat the cancerous tissue. With radiotherapy, the x-ray source is usually located at a distance of about 1-metere from the patient and focused on the treatment area. For brachytherapy the optimization phase of the treatment plan consists of determining the optimal placement of the radioactive sources, which delivers the prescribed dose to the disease tissue while simultaneously sparing (reducing) the dose to sensitive tissue and organs. For external beam radiation therapy the optimization phase of the treatment plan consists of determining the optimal direction and intensity of beam, which provides complete coverage of the tumor region with the prescribed dose while simultaneously avoiding sensitive tissue areas. For both therapy methods, the optimal treatment plan is one in which the diseased tissue has been treated with the prescribed dose and dose to the sensitive tissue and organs has been kept to a minimum.

  8. Optimization and geophysical inverse problems

    E-Print Network [OSTI]

    Barhen, J.

    2008-01-01T23:59:59.000Z

    for Unconstrained Optimization and Nonlinear Equations,equality constrained optimization, SIAM J. Optim. , 7, 28.R. , Practical Methods of Optimization, Wiley, New York, 436

  9. Next Generation Nuclear Plant Methods Research and Development Technical Program Plan -- PLN-2498

    SciTech Connect (OSTI)

    Richard R. Schultz; Abderrafi M. Ougouag; David W. Nigg; Hans D. Gougar; Richard W. Johnson; William K. Terry; Chang H. Oh; Donald W. McEligot; Gary W. Johnsen; Glenn E. McCreery; Woo Y. Yoon; James W. Sterbentz; J. Steve Herring; Temitope A. Taiwo; Thomas Y. C. Wei; William D. Pointer; Won S. Yang; Michael T. Farmer; Hussein S. Khalil; Madeline A. Feltus

    2008-09-01T23:59:59.000Z

    One of the great challenges of designing and licensing the Very High Temperature Reactor (VHTR) is to confirm that the intended VHTR analysis tools can be used confidently to make decisions and to assure all that the reactor systems are safe and meet the performance objectives of the Generation IV Program. The research and development (R&D) projects defined in the Next Generation Nuclear Plant (NGNP) Design Methods Development and Validation Program will ensure that the tools used to perform the required calculations and analyses can be trusted. The Methods R&D tasks are designed to ensure that the calculational envelope of the tools used to analyze the VHTR reactor systems encompasses, or is larger than, the operational and transient envelope of the VHTR itself. The Methods R&D focuses on the development of tools to assess the neutronic and thermal fluid behavior of the plant. The fuel behavior and fission product transport models are discussed in the Advanced Gas Reactor (AGR) program plan. Various stress analysis and mechanical design tools will also need to be developed and validated and will ultimately also be included in the Methods R&D Program Plan. The calculational envelope of the neutronics and thermal-fluids software tools intended to be used on the NGNP is defined by the scenarios and phenomena that these tools can calculate with confidence. The software tools can only be used confidently when the results they produce have been shown to be in reasonable agreement with first-principle results, thought-problems, and data that describe the highly ranked phenomena inherent in all operational conditions and important accident scenarios for the VHTR.

  10. Bias-Variance Techniques for Monte Carlo Optimization: Cross-validation for the CE Method

    E-Print Network [OSTI]

    Rajnarayan, Dev

    2008-01-01T23:59:59.000Z

    In this paper, we examine the CE method in the broad context of Monte Carlo Optimization (MCO) and Parametric Learning (PL), a type of machine learning. A well-known overarching principle used to improve the performance of many PL algorithms is the bias-variance tradeoff. This tradeoff has been used to improve PL algorithms ranging from Monte Carlo estimation of integrals, to linear estimation, to general statistical estimation. Moreover, as described by, MCO is very closely related to PL. Owing to this similarity, the bias-variance tradeoff affects MCO performance, just as it does PL performance. In this article, we exploit the bias-variance tradeoff to enhance the performance of MCO algorithms. We use the technique of cross-validation, a technique based on the bias-variance tradeoff, to significantly improve the performance of the Cross Entropy (CE) method, which is an MCO algorithm. In previous work we have confirmed that other PL techniques improve the perfomance of other MCO algorithms. We conclude that ...

  11. CCCG 2014, Halifax, Nova Scotia, August 1113, 2014 An improved method for generating triangle-mesh models of images

    E-Print Network [OSTI]

    Adams, Michael D.

    CCCG 2014, Halifax, Nova Scotia, August 11­13, 2014 An improved method for generating triangle of Victoria, Victoria, BC, Canada, {xiaom,mdadams}@ece.uvic.ca triangulated were chosen. Since

  12. A New Coarsening Operator for the Optimal Preconditioning of the Dual and Primal Domain Decomposition Methods

    E-Print Network [OSTI]

    Spatiales Universit'e de Li`ege Rue Ernest Solvay, 21, B­4000 Li`ege, Belgium Abstract We present an optimal

  13. Nuclear Instruments and Methods in Physics Research A 474 (2001) 273284 Optimal coded aperture patterns for improved SNR in nuclear

    E-Print Network [OSTI]

    Schettini, Raimondo

    2001-01-01T23:59:59.000Z

    Nuclear Instruments and Methods in Physics Research A 474 (2001) 273284 Optimal coded aperture patterns for improved SNR in nuclear medicine imaging Roberto Accorsia , Francesca Gasparinib , Richard C. Lanzaa, * a Nuclear Engineering Department, Massachusetts Institute of Technology, Room NW13-221, 77

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

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    An analysis of pavement heat flux to optimize the1 water efficiency of a pavement-watering method2.hendel@paris.fr)8 9 Preprint version. Uploaded on May 12th , 2014.10 Abstract: Pavement-watering as a technique rarely been conducted. We propose an15 analysis of pavement heat flux at a depth of 5 cm and solar

  15. Abstract--This paper proposes an optimization based method of planning reactive power control for electric transmission

    E-Print Network [OSTI]

    Kumar, Ratnesh

    1 Abstract--This paper proposes an optimization based method of planning reactive power control for electric transmission systems to endow them with the capability of being reconfigured to a secure planning, reactive power control, reconfiguration, voltage stability. I. INTRODUCTION PPROPRIATE long

  16. Research Support in Hungary Machine scheduling LED public lighting Microsimulation in public transportation Finally Optimization and Operation Research methods for

    E-Print Network [OSTI]

    Balázs, Bánhelyi

    Euros per full time researcher year. The Hungarian research support scheme has several other smallerResearch Support in Hungary Machine scheduling LED public lighting Microsimulation in public transportation Finally Optimization and Operation Research methods for Real Life Industrial Problems Tibor

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

    E-Print Network [OSTI]

    Oriakhi, Edgar Velazquez

    2012-07-16T23:59:59.000Z

    DESIGN-BY-ANALOGY USING THE WORDTREE METHOD AND AN AUTOMATED WORDTREE GENERATING TOOL A Thesis by EDGAR VELAZQUEZ ORIAKHI Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment... of the requirements for the degree of MASTER OF SCIENCE May 2011 Major Subject: Mechanical Engineering DESIGN-BY-ANALOGY USING THE WORDTREE METHOD AND AN AUTOMATED WORDTREE GENERATING TOOL A Thesis by EDGAR VELAZQUEZ ORIAKHI Submitted...

  18. Optimal homotopy perturbation method for nonlinear differential equations governing MHD Jeffery-Hamel flow with heat transfer problem

    E-Print Network [OSTI]

    Marinca, Vasile

    2015-01-01T23:59:59.000Z

    In this paper, Optimal Homotopy Perturbation Method (OHPM) is employed to determine an analytic approximate solutions for nonlinear MHD Jeffery-Hamel flow and heat transfer problem. The Navier-Stokes equations, taking into account Maxwell's electromagnetism and heat transfer lead to two nonlinear ordinary differential equations. The obtained results by means of OHPM show a very good agreement in comparison with the numerical results and with Homotopy Perturbation Method (HPM).

  19. Variable cooling circuit for thermoelectric generator and engine and method of control

    DOE Patents [OSTI]

    Prior, Gregory P

    2012-10-30T23:59:59.000Z

    An apparatus is provided that includes an engine, an exhaust system, and a thermoelectric generator (TEG) operatively connected to the exhaust system and configured to allow exhaust gas flow therethrough. A first radiator is operatively connected to the engine. An openable and closable engine valve is configured to open to permit coolant to circulate through the engine and the first radiator when coolant temperature is greater than a predetermined minimum coolant temperature. A first and a second valve are controllable to route cooling fluid from the TEG to the engine through coolant passages under a first set of operating conditions to establish a first cooling circuit, and from the TEG to a second radiator through at least some other coolant passages under a second set of operating conditions to establish a second cooling circuit. A method of controlling a cooling circuit is also provided.

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

    DOE Patents [OSTI]

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

    2014-12-02T23:59:59.000Z

    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.

  1. High temperature adhesive silicone foam composition, foam generating system and method of generating foam. [For access denial

    DOE Patents [OSTI]

    Mead, J.W.; Montoya, O.J.; Rand, P.B.; Willan, V.O.

    1983-12-21T23:59:59.000Z

    Access to a space is impeded by generation of a sticky foam from a silicone polymer and a low boiling solvent such as a halogenated hydrocarbon. In a preferred aspect, the formulation is polydimethylsiloxane gel mixed with F502 Freon as a solvent and blowing agent, and pressurized with CO/sub 2/ in a vessel to about 250 PSI, whereby when the vessel is opened, a sticky and solvent resistant foam is deployed. The foam is deployable, over a wide range of temperatures, adhering to wet surfaces as well as dry, is stable over long periods of time and does not propagate flame or lose adhesive properties during an externally supported burn.

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

    E-Print Network [OSTI]

    Ábrahám, Erika

    , parabolic trough 1. Motivation (Introduction) Today, designs of solar thermal power plants are developed and Applied Optics (MAO), Fraunhofer-Institut für Solare Energiesysteme ISE, Heidenhofstra?e 2, 79110 Freiburg for design optimization of solar thermal power plants. Thereby, optimization potential can be discovered

  3. Regenerative Heater Optimization for Steam Turbo-Generation Cycles of Generation IV Nuclear Power Plants with a Comparison of Two Concepts for the Westinghouse International Reactor Innovative and Secure (IRIS)

    SciTech Connect (OSTI)

    Williams, W.C.

    2002-08-01T23:59:59.000Z

    The intent of this study is to discuss some of the many factors involved in the development of the design and layout of a steam turbo-generation unit as part of a modular Generation IV nuclear power plant. Of the many factors involved in the design and layout, this research will cover feed water system layout and optimization issues. The research is arranged in hopes that it can be generalized to any Generation IV system which uses a steam powered turbo-generation unit. The research is done using the ORCENT-II heat balance codes and the Salisbury methodology to be reviewed herein. The Salisbury methodology is used on an original cycle design by Famiani for the Westinghouse IRIS and the effects due to parameter variation are studied. The vital parameters of the Salisbury methodology are the incremental heater surface capital cost (S) in $/ft{sup 2}, the value of incremental power (I) in $/kW, and the overall heat transfer coefficient (U) in Btu/ft{sup 2}-degrees Fahrenheit-hr. Each is varied in order to determine the effects on the cycles overall heat rate, output, as well as, the heater surface areas. The effects of each are shown. Then the methodology is then used to compare the optimized original Famiani design consisting of seven regenerative feedwater heaters with an optimized new cycle concept, INRC8, containing four regenerative heaters. The results are shown. It can be seen that a trade between the complexity of the seven stage regenerative Famiani cycle and the simplicity of the INRC8 cycle can be made. It is desired that this methodology can be used to show the ability to evaluate modularity through the value of size a complexity of the system as well as the performance. It also shows the effectiveness of the Salisbury methodology in the optimization of regenerative cycles for such an evaluation.

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

    DOE Patents [OSTI]

    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

    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.

  5. Method for generating a mesh representation of a region characterized by a trunk and a branch thereon

    DOE Patents [OSTI]

    Shepherd, Jason (Albuquerque, NM); Mitchell, Scott A. (Albuquerque, NM); Jankovich, Steven R. (Anaheim, CA); Benzley, Steven E. (Provo, UT)

    2007-05-15T23:59:59.000Z

    The present invention provides a meshing method, called grafting, that lifts the prior art constraint on abutting surfaces, including surfaces that are linking, source/target, or other types of surfaces of the trunk volume. The grafting method locally modifies the structured mesh of the linking surfaces allowing the mesh to conform to additional surface features. Thus, the grafting method can provide a transition between multiple sweep directions extending sweeping algorithms to 23/4-D solids. The method is also suitable for use with non-sweepable volumes; the method provides a transition between meshes generated by methods other than sweeping as well.

  6. Generator-absorber-heat exchange heat transfer apparatus and method and use thereof in a heat pump

    DOE Patents [OSTI]

    Phillips, Benjamin A. (Benton Harbor, MI); Zawacki, Thomas S. (St. Joseph, MI)

    1996-12-03T23:59:59.000Z

    Numerous embodiments and related methods for generator-absorber heat exchange (GAX) are disclosed, particularly for absorption heat pump systems. Such embodiments and related methods use the working solution of the absorption system for the heat transfer medium. A combination of weak and rich liquor working solution is used as the heat transfer medium.

  7. Automatic Test Case Generation Using Multi-protocol Test Method Soo-in Lee, Yongbum Park, and Myungchul Kim

    E-Print Network [OSTI]

    Lee, Ben

    Automatic Test Case Generation Using Multi-protocol Test Method Soo-in Lee, Yongbum Park, mckim}@icu.ac.kr Abstract - A method for testing multi-protocol implementation under test (IUT) with a single test suite has been proposed in the literature. It tests a multi-protocol IUT in an integrated way

  8. Testing the improved method for calculating the radiation heat generation at the periphery of the BOR-60 reactor core

    SciTech Connect (OSTI)

    Varivtsev, A. V., E-mail: vav3@niiar.ru; Zhemkov, I. Yu. [JSC SSC RIAR, Dimitrovgrad-10 (Russian Federation)

    2014-12-15T23:59:59.000Z

    The application of the improved method for calculating the radiation heat generation in the elements of an experimental device located at the periphery of the BOR-60 reactor core results in a significant reduction in the discrepancies between the calculated and the experimental data. This allows us to conclude that the improved method has an advantage over the one used earlier.

  9. Advanced Review Geometry optimization

    E-Print Network [OSTI]

    Schlegel, H. Bernhard

    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

  10. A comparison of taxonomy generation techniques using bibliometric methods : applied to research strategy formulation

    E-Print Network [OSTI]

    Camia, Steven L

    2010-01-01T23:59:59.000Z

    This paper investigates the modeling of research landscapes through the automatic generation of hierarchical structures (taxonomies) comprised of terms related to a given research field. Several different taxonomy generation ...

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

    SciTech Connect (OSTI)

    Mowery, A.L. Jr.

    1993-09-21T23:59:59.000Z

    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.

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

    SciTech Connect (OSTI)

    Mowery, A.L. Jr.

    1992-12-31T23:59:59.000Z

    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.

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

    DOE Patents [OSTI]

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

    1993-01-01T23:59:59.000Z

    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.

  14. General method for simultaneous optimization of light trapping and carrier collection in an ultra-thin film organic photovoltaic cell

    SciTech Connect (OSTI)

    Tsai, Cheng-Chia, E-mail: ct2443@columbia.edu; Grote, Richard R.; Beck, Jonathan H.; Kymissis, Ioannis [Department of Electrical Engineering, Columbia University, New York, New York 10027 (United States); Osgood, Richard M. [Department of Electrical Engineering, Columbia University, New York, New York 10027 (United States); Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027 (United States); Englund, Dirk [Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

    2014-07-14T23:59:59.000Z

    We describe a general method for maximizing the short-circuit current in thin planar organic photovoltaic (OPV) heterojunction cells by simultaneous optimization of light absorption and carrier collection. Based on the experimentally obtained complex refractive indices of the OPV materials and the thickness-dependence of the internal quantum efficiency of the OPV active layer, we analyze the potential benefits of light trapping strategies for maximizing the overall power conversion efficiency of the cell. This approach provides a general strategy for optimizing the power conversion efficiency of a wide range of OPV structures. In particular, as an experimental trial system, the approach is applied here to a ultra-thin film solar cell with a SubPc/C{sub 60} photovoltaic structure. Using a patterned indium tin oxide (ITO) top contact, the numerically optimized designs achieve short-circuit currents of 0.790 and 0.980?mA/cm{sup 2} for 30?nm and 45?nm SubPc/C{sub 60} heterojunction layer thicknesses, respectively. These values correspond to a power conversion efficiency enhancement of 78% for the 30?nm thick cell, but only of 32% for a 45?nm thick cell, for which the overall photocurrent is actually higher. Applied to other material systems, the general optimization method can elucidate if light trapping strategies can improve a given cell architecture.

  15. Method and apparatus for anti-islanding protection of distributed generations

    DOE Patents [OSTI]

    Ye, Zhihong; John, Vinod; Wang, Changyong; Garces, Luis Jose; Zhou, Rui; Li, Lei; Walling, Reigh Allen; Premerlani, William James; Sanza, Peter Claudius; Liu, Yan; Dame, Mark Edward

    2006-03-21T23:59:59.000Z

    An apparatus for anti-islanding protection of a distributed generation with respect to a feeder connected to an electrical grid is disclosed. The apparatus includes a sensor adapted to generate a voltage signal representative of an output voltage and/or a current signal representative of an output current at the distributed generation, and a controller responsive to the signals from the sensor. The controller is productive of a control signal directed to the distributed generation to drive an operating characteristic of the distributed generation out of a nominal range in response to the electrical grid being disconnected from the feeder.

  16. Conceptual design and optimization of a 1-1/2 generation PFBC plant task 14. Topical report

    SciTech Connect (OSTI)

    White, J.S.; Witman, P.M.; Harbaugh, L.; Rubow, L.N.; Horazak, D.A.

    1994-12-01T23:59:59.000Z

    The economics and performance of advanced pressurized fluidized bed (PFBC) cycles developed for utility applications during the last 10 years (especially the 2nd-Generation PFBC cycle) are projected to be favorable compared to conventional pulverized coal power plants. However, the improved economics of 2nd-Generation PFBC cycles are accompanied by the perception of increased technological risk related to the pressurized carbonizer and its associated gas cleanup systems. A PFBC cycle that removed the uncertainties of the carbonizer while retaining the high efficiency and low cost of a 2nd-Generation PFBC cycle could improve the prospects for early commercialization and pave the way for the introduction of the complete 2nd-Generation PFBC cycle at some later date. One such arrangement is a PFBC cycle with natural gas topping combustion, referred to as the 1.5-Generation PFBC cycle. This cycle combines the advantages of the 2nd-Generation PFBC plant with the reduced risk associated with a gas turbine burning natural gas, and can potentially be part of a phased approach leading to the commercialization of utility 2nd-Generation PFBC cycles. The 1.5-Generation PFBC may also introduce other advantages over the more complicated 2nd-Generation PFBC system. This report describes the technical and economic evaluation of 1.5-Generation PFBC cycles for utility or industrial power generation.

  17. Methods, systems and apparatus for optimization of third harmonic current injection in a multi-phase machine

    DOE Patents [OSTI]

    Gallegos-Lopez, Gabriel

    2012-10-02T23:59:59.000Z

    Methods, system and apparatus are provided for increasing voltage utilization in a five-phase vector controlled machine drive system that employs third harmonic current injection to increase torque and power output by a five-phase machine. To do so, a fundamental current angle of a fundamental current vector is optimized for each particular torque-speed of operating point of the five-phase machine.

  18. Incorporating Drivability Metrics into Optimal Energy Management Strategies for Hybrid Vehicles Part 1: Model, Methods, and

    E-Print Network [OSTI]

    Grizzle, Jessy W.

    Incorporating Drivability Metrics into Optimal Energy Management Strategies for Hybrid Vehicles-parallel configuration considered here. Hybrid vehicles are characterized by multiple energy sources; the strategy Gillespie, Jeffrey A. Cook, and J.W. Grizzle Abstract--Hybrid Vehicle fuel economy performance is highly

  19. Synthesis method based on optimization techniques for designing piecewise-uniform

    E-Print Network [OSTI]

    Park, Namkyoo

    Science, Korea Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-gu, Taejon 305-descent optimization techniques. We describe how a piecewise-uniform LPFG can be constructed by utilizing the inverted the LPFG with thermal changes, we propose the kernel function17 used to calcu- late the coupling

  20. Evaluating shortfalls in mixed-integer programming approaches for the optimal design and dispatch of distributed generation systems

    E-Print Network [OSTI]

    heat and power Fuel cells Building energy a b s t r a c t The distributed generation (DG) of combined Wisconsin, retrofitted with solid-oxide fuel cells (SOFCs) and a hot water storage tank. The simpler model of renewable or non- renewable sources of power generation (e.g., photovoltaic (PV) cells, fuel cells

  1. Abstract--This paper describes a motion generation method for dynamic lifting by a humanoid robot. The proposed

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    in Fig. 1(b). If useful skills of the humans using preliminary motion can be applied to robotAbstract--This paper describes a motion generation method for dynamic lifting by a humanoid robot to facilitate the lifting movement. In particular, the idea is to perform a preliminary motion in order

  2. Preprint of the paper submitted to CMWR XVI 2006, Copenhagen, Denmark, 19-22 June, 2006 DERIVATIVE-FREE OPTIMIZATION METHODS FOR HANDLING

    E-Print Network [OSTI]

    Stryk, Oskar von

    -FREE OPTIMIZATION METHODS FOR HANDLING FIXED COSTS IN OPTIMAL GROUNDWATER REMEDIATION DESIGN T. HEMKER1 , K-integer problem formulation and use an iterative stochastic modeling technique to build surrogate functions on the benchmarking problem and point the way towards improvement and future work. 1. INTRODUCTION AND MOTIVATION

  3. Optimization of a rapid microbiological method for the assessment of lysine bioavailability of animal feed proteins

    E-Print Network [OSTI]

    Erickson, Anne Marie

    1999-01-01T23:59:59.000Z

    such as Corynebacterium glutamicum and Brevibacterium flavum require sub-optimal levels of homoserine and excess bioun for the overproduction of lysine. These conditions ensure that key regulatory enzymes for lysine production are not inhibited (51). In some instances...). For microbial amino acid production, bacterial suains that overproduce lysine as a metabolic by-product are grown as pure cultures in an industrial fermenter. Lysine is excreted from the bacterial cells and recovered. Through specific strain selection...

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

    DOE Patents [OSTI]

    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

    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.

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

    E-Print Network [OSTI]

    Alexander, Brentan R

    2007-01-01T23:59:59.000Z

    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 ...

  6. Optimization Online Digest -- February 2015

    E-Print Network [OSTI]

    Computational Optimization of Gas Compressor Stations: MINLP Models vs. ... The Cyclic Block Conditional Gradient Method for Convex Optimization Problems

  7. A conjugate Rosen's gradient projection method with global line search for piecewise linear optimization

    E-Print Network [OSTI]

    Beltran-Royo, Cesar

    A conjugate Rosen's gradient projection method with global line search for piecewise linear cutting plane method, simplex method, Rosen's gradient projection, conjugate gradient. 1 Introduction the zig-zagging of the gradient projection, we propose a conjugate gradient version of the face simplex

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

    DOE Patents [OSTI]

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

    2006-10-03T23:59:59.000Z

    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.

  9. Wind turbine generators having wind assisted cooling systems and cooling methods

    DOE Patents [OSTI]

    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

    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.

  10. Method and apparatus for enhanced heat recovery from steam generators and water heaters

    DOE Patents [OSTI]

    Knight, Richard A.; Rabovitser, Iosif K.; Wang, Dexin

    2006-06-27T23:59:59.000Z

    A heating system having a steam generator or water heater, at least one economizer, at least one condenser and at least one oxidant heater arranged in a manner so as to reduce the temperature and humidity of the exhaust gas (flue gas) stream and recover a major portion of the associated sensible and latent heat. The recovered heat is returned to the steam generator or water heater so as to increase the quantity of steam generated or water heated per quantity of fuel consumed. In addition, a portion of the water vapor produced by combustion of fuel is reclaimed for use as feed water, thereby reducing the make-up water requirement for the system.

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

    SciTech Connect (OSTI)

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

    1994-10-01T23:59:59.000Z

    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.

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

    DOE Patents [OSTI]

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

    2014-12-30T23:59:59.000Z

    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.

  13. Riemannian Optimization Method on the Flag Manifold for Independent Subspace Analysis

    E-Print Network [OSTI]

    Plumbley, Mark

    of Advanced Industrial Science and Technology (AIST), AIST Central2, 1-1-1, Umezono, Tsukuba, Ibaraki 305 , the components si are generated from statistically independent sources, and A Rnn is an invertible matrix. Most, and curvature. Therefore, by replacing, for instance, an or- dinary gradient vector of a cost function

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

    SciTech Connect (OSTI)

    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

    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.

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

    E-Print Network [OSTI]

    Liberzon, Daniel

    of a power system; this uncertainty arises from the increasing penetration of renewable resources that the uncertain generation can take by a zonotope and propagate it through a linearized power flow model take values within a symmetric polytope. This uncertainty is propagated through the power system model

  16. IMPROVING INTELLIGIBILITY IN NOISE OF HMM-GENERATED SPEECH VIA NOISE-DEPENDENT AND -INDEPENDENT METHODS

    E-Print Network [OSTI]

    Edinburgh, University of

    the intelligibility of HMM-generated Text-to- Speech (TTS) in noise, this work evaluates several speech enhance- ment in noise. Accordingly, there is great interest in speech in- telligibility enhancement algorithms for both] and the insertion of small pauses [14]. Statistical approaches to speech enhancement using recordings of speech

  17. Optimized Generation of Data-path from C Codes for FPGAs Zhi Guo Betul Buyukkurt Walid Najjar

    E-Print Network [OSTI]

    Najjar, Walid A.

    on FPGAs, more specifically on CSoCs. It generates RTL level HDLs from frequently executing kernels System- on-a-Chip (CSoC), which has one or more microprocessors integrated with a field-programmable gate in the way of wider acceptance of CSoC platforms is their programmability. Application developers must have

  18. An Advanced Integrated Diffusion/Transport Method for the Design, Analysis and Optimization of the Very-High-Temperature Reactors

    SciTech Connect (OSTI)

    Farzad Rahnema; Dingkang Zhang; Abderrafi Ougouag; Frederick Gleicher

    2011-04-04T23:59:59.000Z

    The main objective of this research is to develop an integrated diffusion/transport (IDT) method to substantially improve the accuracy of nodal diffusion methods for the design and analysis of Very High Temperature Reactors (VHTR). Because of the presence of control rods in the reflector regions in the Pebble Bed Reactor (PBR-VHTR), traditional nodal diffusion methods do not accurately model these regions, within which diffusion theory breaks down in the vicinity of high neutron absorption and steep flux gradients. The IDT method uses a local transport solver based on a new incident flux response expansion method in the controlled nodes. Diffusion theory is used in the rest of the core. This approach improves the accuracy of the core solution by generating transport solutions of controlled nodes while maintaining computational efficiency by using diffusion solutions in nodes where such a treatment is sufficient. The transport method is initially developed and coupled to the reformulated 3-D nodal diffusion model in the CYNOD code for PBR core design and fuel cycle analysis. This method is also extended to the prismatic VHTR. The new method accurately captures transport effects in highly heterogeneous regions with steep flux gradients. The calculations of these nodes with transport theory avoid errors associated with spatial homogenization commonly used in diffusion methods in reactor core simulators

  19. Optimization Online - Convex and Nonsmooth Optimization ...

    E-Print Network [OSTI]

    Convex Optimization Methods for Dimension Reduction and Coefficient Estimation in ... Impulsive Optimal Control of Hybrid Finite-Dimensional Lagrangian Systems ... Incremental-like Bundle Methods with Application to Energy Planning

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

    E-Print Network [OSTI]

    Zhang, Xuesong

    2009-05-15T23:59:59.000Z

    -7. Performance of PSO and PSO-SVM against model evaluations. .............. 117 Figure 7-1. Schematic illustration of one iteration of EMC.......................................... 126 Figure 7-2. Simulated values of the first and fifth component from the two...-modal distribution. The solid line is the true value, and the grey area is the density estimated by EMC. ......................................................................... 134 Figure 7-3. Scatter plot of the samples generated by EMC for the 20-modal...

  1. Optimized shooting method for finding periodic orbits of nonlinear dynamical systems

    E-Print Network [OSTI]

    W. Dednam; A. E. Botha

    2014-08-14T23:59:59.000Z

    An alternative numerical method is developed to find stable and unstable periodic orbits of nonlinear dynamical systems. The method exploits the high-efficiency of the Levenberg-Marquardt algorithm for medium-sized problems and has the additional advantage of being relatively simple to implement. It is also applicable to both autonomous and non-autonomous systems. As an example of its use, it is employed to find periodic orbits in the R\\"ossler system, a coupled R\\"ossler system, as well as an eight-dimensional model of a flexible rotor-bearing; problems which have been treated previously via two related methods. The results agree with the previous methods and are seen to be more accurate in some cases. A simple implementation of the method, written in the Python programming language, is provided as an Appendix.

  2. Method and split cavity oscillator/modulator to generate pulsed particle beams and electromagnetic fields

    DOE Patents [OSTI]

    Clark, M.C.; Coleman, P.D.; Marder, B.M.

    1993-08-10T23:59:59.000Z

    A compact device called the split cavity modulator whose self-generated oscillating electromagnetic field converts a steady particle beam into a modulated particle beam. The particle beam experiences both signs of the oscillating electric field during the transit through the split cavity modulator. The modulated particle beam can then be used to generate microwaves at that frequency and through the use of extractors, high efficiency extraction of microwave power is enabled. The modulated beam and the microwave frequency can be varied by the placement of resistive wires at nodes of oscillation within the cavity. The short beam travel length through the cavity permit higher currents because both space charge and pinching limitations are reduced. The need for an applied magnetic field to control the beam has been eliminated.

  3. Method and split cavity oscillator/modulator to generate pulsed particle beams and electromagnetic fields

    DOE Patents [OSTI]

    Clark, M. Collins (Albuquerque, NM); Coleman, P. Dale (Albuquerque, NM); Marder, Barry M. (Albuquerque, NM)

    1993-01-01T23:59:59.000Z

    A compact device called the split cavity modulator whose self-generated oscillating electromagnetic field converts a steady particle beam into a modulated particle beam. The particle beam experiences both signs of the oscillating electric field during the transit through the split cavity modulator. The modulated particle beam can then be used to generate microwaves at that frequency and through the use of extractors, high efficiency extraction of microwave power is enabled. The modulated beam and the microwave frequency can be varied by the placement of resistive wires at nodes of oscillation within the cavity. The short beam travel length through the cavity permit higher currents because both space charge and pinching limitations are reduced. The need for an applied magnetic field to control the beam has been eliminated.

  4. Optimization Online - Stochastic Topology Design Optimization for ...

    E-Print Network [OSTI]

    Miguel Carrasco

    2014-07-08T23:59:59.000Z

    Jul 8, 2014 ... Computer Methods in Applied Mechanics and Engineering. Elsevier. Accepted. 2015 ... Optmization Society. Mathematical Optimization Society.

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

    DOE Patents [OSTI]

    Bers, Abraham (Arlington, MA)

    1981-01-01T23:59:59.000Z

    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.

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

    DOE Patents [OSTI]

    Fisch, Nathaniel J. (Cambridge, MA)

    1981-01-01T23:59:59.000Z

    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.

  7. Resonantly enhanced method for generation of tunable, coherent vacuum ultraviolet radiation

    DOE Patents [OSTI]

    Glownia, James H. (Los Alamos, NM); Sander, Robert K. (Los Alamos, NM)

    1985-01-01T23:59:59.000Z

    Carbon Monoxide vapor is used to generate coherent, tunable vacuum ultraviolet radiation by third-harmonic generation using a single tunable dye laser. The presence of a nearby electronic level resonantly enhances the nonlinear susceptibility of this molecule allowing efficient generation of the vuv light at modest pump laser intensities, thereby reducing the importance of a six-photon multiple-photon ionization process which is also resonantly enhanced by the same electronic level but to higher order. By choosing the pump radiation wavelength to be of shorter wavelength than individual vibronic levels used to extend tunability stepwise from 154.4 to 124.6 nm, and the intensity to be low enough, multiple-photon ionization can be eliminated. Excitation spectra of the third-harmonic emission output exhibit shifts to shorter wavelength and broadening with increasing CO pressure due to phase matching effects. Increasing the carbon monoxide pressure, therefore, allows the substantial filling in of gaps arising from the stepwise tuning thereby providing almost continuous tunability over the quoted range of wavelength emitted.

  8. Resonantly enhanced method for generation of tunable, coherent vacuum-ultraviolet radiation

    DOE Patents [OSTI]

    Glownia, J.H.; Sander, R.K.

    1982-06-29T23:59:59.000Z

    Carbon Monoxide vapor is used to generate coherent, tunable vacuum ultraviolet radiation by third-harmonic generation using a single tunable dye laser. The presence of a nearby electronic level resonantly enhances the nonlinear susceptibility of this molecule allowing efficient generation of the vuv light at modest pump laser intensities, thereby reducing the importance of a six-photon multiple-photon ionization process which is also resonantly enhanced by the same electronic level but no higher order. By choosing the pump radiation wavelength to be of shorter wavelength than individual vibronic levels used to extend tunability stepwise from 154.4 to 124.6 nm, and the intensity to be low enough, multiple-photon ionization can be eliminated. Excitation spectra of the third-harmonic emission output exhibit shifts to shorter wavelength and broadening with increasing CO pressure due to phase matching effects. Increasing the carbon monoxide pressure, therefore, allows the substantial filling in of gaps arising from the stepwise tuning thereby providing almost continuous tunability over the quoted range of wavelength emitted.

  9. Fuzzy logic controller optimization

    DOE Patents [OSTI]

    Sepe, Jr., Raymond B; Miller, John Michael

    2004-03-23T23:59:59.000Z

    A method is provided for optimizing a rotating induction machine system fuzzy logic controller. The fuzzy logic controller has at least one input and at least one output. Each input accepts a machine system operating parameter. Each output produces at least one machine system control parameter. The fuzzy logic controller generates each output based on at least one input and on fuzzy logic decision parameters. Optimization begins by obtaining a set of data relating each control parameter to at least one operating parameter for each machine operating region. A model is constructed for each machine operating region based on the machine operating region data obtained. The fuzzy logic controller is simulated with at least one created model in a feedback loop from a fuzzy logic output to a fuzzy logic input. Fuzzy logic decision parameters are optimized based on the simulation.

  10. Successive Backward Sweep Methods for Optimal Control of Nonlinear Systems with Constraints

    E-Print Network [OSTI]

    Cho, Donghyurn

    2013-08-13T23:59:59.000Z

    and Differential Dynamic Programming algorithms, which are based on the successive solutions to a series of linear control problems with quadratic performance indices. The SBS methods are relatively insensitive to the initial guesses of the state and control...

  11. A non-linear constrained optimization technique for the mimetic finite difference method

    SciTech Connect (OSTI)

    Manzini, Gianmarco [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Svyatskiy, Daniil [Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Bertolazzi, Enrico [Univ. of Trento (Italy); Frego, Marco [Univ. of Trento (Italy)

    2014-09-30T23:59:59.000Z

    This is a strategy for the construction of monotone schemes in the framework of the mimetic finite difference method for the approximation of diffusion problems on unstructured polygonal and polyhedral meshes.

  12. A computational method and software development for make-to-order pricing optimization

    E-Print Network [OSTI]

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

    2006-01-01T23:59:59.000Z

    High variability of demand and inflexible capacity are inevitable in a make-to-order production despite its cost savings. A computational method is proposed in this thesis to exploit pricing opportunities in the price ...

  13. A Stochastic Quasi-Newton Method for Large-Scale Optimization

    E-Print Network [OSTI]

    2015-02-17T23:59:59.000Z

    Department of Industrial Engineering and Management Sciences, ... Office of Advanced Scientific Computing Research, Applied Mathematics program ... ples include computer network traffic, web search, online advertisement, and sensor .... and stochastic gradient descent (SGD) method are used in the literature to denote.

  14. Global convergence of the Heavy-ball method for convex optimization

    E-Print Network [OSTI]

    2014-12-20T23:59:59.000Z

    iterates converges to the optimum at a rate of O(1/k) where k is the number of ...... M. R. Hestenes and E. Stiefel, Methods of conjugate gradients for solving linear...

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

    E-Print Network [OSTI]

    Mikati, Samir Omar

    2009-01-01T23:59:59.000Z

    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 ...

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

    SciTech Connect (OSTI)

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

    2013-07-01T23:59:59.000Z

    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)

  17. Optimizing Test Pattern Generation Using Top-Off ATPG Methodology for StuckAT, Transition and Small Delay Defect Faults

    E-Print Network [OSTI]

    Gill, Arjun

    2013-05-01T23:59:59.000Z

    ........................................................................................ 7 3. ATPG METHODS ........................................................................................................ 8 3.1 DC Scan... ................................................................................................................ 8 3.2 AC Scan ................................................................................................................ 9 3.3 AC Scan For Transition Faults - Shortcomings For SDD Detection ................. 12 4. TOP-OFF ATPG...

  18. Method and apparatus for optimizing the efficiency and quality of laser material processing

    DOE Patents [OSTI]

    Susemihl, Ingo (Norderstedt, DE)

    1990-01-01T23:59:59.000Z

    The efficiency of laser welding and other laser material processing is optimized according to this invention by rotating the plane of polarization of a linearly polarized laser beam in relation to a work piece of the material being processed simultaneously and in synchronization with steering the laser beam over the work piece so as to keep the plane of polarization parallel to either the plane of incidence or the direction of travel of the beam in relation to the work piece. Also, depending to some extent on the particular processing being accomplished, such as welding or fusing, the angle of incidence of the laser beam on the work piece is kept at or near the polarizing or Brewster's angle. The combination of maintaining the plane of polarization parallel to plane of incidence while also maintaining the angle of incidence at or near the polarizing or Brewster's angle results in only minimal, if any, reflection losses during laser welding. Also, coordinating rotation of the plane of polarization with the translation or steering of a work piece under a laser cutting beam maximizes efficiency and kerf geometry, regardless of the direction of cut.

  19. Method and apparatus for optimizing the efficiency and quality of laser material processing

    DOE Patents [OSTI]

    Susemihl, I.

    1990-03-13T23:59:59.000Z

    The efficiency of laser welding and other laser material processing is optimized according to this invention by rotating the plane of polarization of a linearly polarized laser beam in relation to a work piece of the material being processed simultaneously and in synchronization with steering the laser beam over the work piece so as to keep the plane of polarization parallel to either the plane of incidence or the direction of travel of the beam in relation to the work piece. Also, depending to some extent on the particular processing being accomplished, such as welding or fusing, the angle of incidence of the laser beam on the work piece is kept at or near the polarizing or Brewster's angle. The combination of maintaining the plane of polarization parallel to plane of incidence while also maintaining the angle of incidence at or near the polarizing or Brewster's angle results in only minimal, if any, reflection losses during laser welding. Also, coordinating rotation of the plane of polarization with the translation or steering of a work piece under a laser cutting beam maximizes efficiency and kerf geometry, regardless of the direction of cut. 7 figs.

  20. A method for the optimization of the birdcage coil in MRI

    E-Print Network [OSTI]

    Spence, Dan Kenrick

    1999-01-01T23:59:59.000Z

    the homogeneity of the coil. This effect is best explained using the method of images (11). Using this method, the shield is assumed to be a perfect conductor and flat. Since the tangential electric fields on the surface of a perfect conductor must be zero, a..., these conditions are E?= E? nz x(H, ? Hz) = J, D, ?-D, ?= p, B, ?= Bz? [2. 26] There are two special cases for these conditions, the boundary between two lossless media, and the boundary between a dielectric and a perfect electrical conductor...

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

    DOE Patents [OSTI]

    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

    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.

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

    DOE Patents [OSTI]

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

    1998-05-05T23:59:59.000Z

    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.

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

    DOE Patents [OSTI]

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

    1998-01-01T23:59:59.000Z

    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.

  4. Deriving Optimal Operational Rules for Mitigating Inter-area Oscillations

    SciTech Connect (OSTI)

    Diao, Ruisheng; Huang, Zhenyu; Zhou, Ning; Chen, Yousu; Tuffner, Francis K.; Fuller, Jason C.; Jin, Shuangshuang; Dagle, Jeffery E.

    2011-05-23T23:59:59.000Z

    This paper introduces a new method to mitigate inter-area oscillations of a large scale interconnected power system by means of generation re-dispatch. The optimal operational control procedures are derived as the shortest distance from the current operating condition to a desired damping ratio of the oscillation mode by adjusting generator outputs. A sensitivity based method is used to select the most effective generators for generation re-dispatch and decision tree is trained to approximate the security boundary in a space characterized by the selected generators. The optimal operational rules can be found by solving an optimization problem where the boundary constraints are provided by the decision tree rules. This method is tested on a Western Electricity Coordinating Council (WECC) 179-bus simplified network model and simulation results have demonstrated the proof of concept and shown promising application in real time operation.

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

    DOE Patents [OSTI]

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

    2009-12-15T23:59:59.000Z

    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.

  6. Almost Optimal Convergence of the Point Vortex Method for Vortex Sheets using Numerical Filtering

    E-Print Network [OSTI]

    Soatto, Stefano

    method was used by Krasny to eliminate this spurious growth of roundoff error and accurately compute for the discretized BirkhoffRott equation with Krasny filtering and simulated roundoff error. The convergence as the effects of Krasny filtering, are precisely estimated. The technique of proof applies directly to other ill

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

    DOE Patents [OSTI]

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

    1980-06-23T23:59:59.000Z

    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.

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

    DOE Patents [OSTI]

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

    1995-10-24T23:59:59.000Z

    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.

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

    DOE Patents [OSTI]

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

    1995-01-01T23:59:59.000Z

    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.

  10. System and method for generating current by selective minority species heating

    DOE Patents [OSTI]

    Fisch, Nathaniel J. (Princeton, NJ)

    1983-01-01T23:59:59.000Z

    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.

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

    DOE Patents [OSTI]

    Tautges, T.J.; Mitchell, S.A.; Blacker, T.D.; Murdoch, P.

    1998-06-16T23:59:59.000Z

    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. 79 figs.

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

    DOE Patents [OSTI]

    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

    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.

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

    DOE Patents [OSTI]

    Waldo, Geoffrey S. (Santa Fe, NM)

    2007-09-18T23:59:59.000Z

    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.

  14. Contacts to WTE operators in Austria using the Balance-Method to label the electricity generated

    E-Print Network [OSTI]

    Szmolyan, Peter

    -effective Determination of "Green" Energy and Fossil CO2 Emissions from WTE Plants Balance-Method DI Heinz Goedl) of the waste feed of the WTE plant (annual values) Figure 4. Annual biogenic and fossil CO2 emissions from the WTE plant % % "Fossil" CO2-emissions Ratio of "green" energy Result 1 Calculation tool for the Balance

  15. Contacts to WTE operators in Austria using the Balance-Method to label the electricity generated

    E-Print Network [OSTI]

    Szmolyan, Peter

    of "Green" Energy and Fossil CO2 Emissions from WTE Plants Description The Balance-Method is based. Annual biogenic and fossil CO2 emissions from the WTE plant % "Fossil" CO2-emissions % Ratio of "green; - Difference between O2 consumption and CO2 production. The required operating data from the WTE plant

  16. A Pliant Method for Anisotropic Mesh Generation Frank J. Bossen # Paul S. Heckbert +

    E-Print Network [OSTI]

    California at Berkeley, University of

    elements conform well to the requested shape metric. The method appears particularly well suited to surface­ ysis, heat transfer, fluid flow, electromagnetics, computer graphics, and other applications. It should interface that allows it to be used inside an adaptive finite element solver or in other contexts. allows

  17. Double sweep preconditioner for optimized Schwarz methods applied to the Helmholtz problem

    SciTech Connect (OSTI)

    Vion, A., E-mail: a.vion@ulg.ac.be; Geuzaine, C., E-mail: cgeuzaine@ulg.ac.be

    2014-06-01T23:59:59.000Z

    This paper presents a preconditioner for non-overlapping Schwarz methods applied to the Helmholtz problem. Starting from a simple analytic example, we show how such a preconditioner can be designed by approximating the inverse of the iteration operator for a layered partitioning of the domain. The preconditioner works by propagating information globally by concurrently sweeping in both directions over the subdomains, and can be interpreted as a coarse grid for the domain decomposition method. The resulting algorithm is shown to converge very fast, independently of the number of subdomains and frequency. The preconditioner has the advantage that, like the original Schwarz algorithm, it can be implemented as a matrix-free routine, with no additional preprocessing.

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

    E-Print Network [OSTI]

    Zhang, Xuesong

    2009-05-15T23:59:59.000Z

    ? weights for river stage prediction (Chau, 2006). Other evolutionary algorithms, such as Differential Evaluation (DE) (Storn and Price, 1997) and Artificial Immune Systems (AIS) (de Castro and Von Zuben, 2002a; de Castro and Von Zuben, 2002b), although... is to structure the hydrologic model as a probability model, then the confidence interval of model output can be computed (Montanari et al., 1997). Representative methods of this category include Markov Chain Monte Carlo (MCMC) and a Generalized Likelihood...

  19. Optimized planning target volume margin in helical tomotherapy for prostate cancer: is there a preferred method?

    E-Print Network [OSTI]

    Cao, Yuan Jie; Chang, Kyung Hwan; Shim, Jang Bo; Kim, Kwang Hyeon; Jang, Min Sun; Yoon, Won Sup; Yang, Dae Sik; Park, Young Je; Kim, Chul Yong

    2015-01-01T23:59:59.000Z

    To compare the dosimetrical differences between plans generated by helical tomotherapy using 2D or 3D margining technique in in prostate cancer. Ten prostate cancer patients were included in this study. For 2D plans, planning target volume (PTV) was created by adding 5 mm (lateral/anterior-posterior) to clinical target volume (CTV). For 3D plans, 5 mm margin was added not only in lateral/anterior-posterior, but also in superior-inferior to CTV. Various dosimetrical indices, including the prescription isodose to target volume (PITV) ratio, conformity index (CI), homogeneity index (HI), target coverage index (TCI), modified dose homogeneity index (MHI), conformation number (CN), critical organ scoring index (COSI), and quality factor (QF) were determined to compare the different treatment plans. Differences between 2D and 3D PTV indices were not significant except for CI (p = 0.023). 3D margin plans (11195 MUs) resulted in higher (13.0%) monitor units than 2D margin plans (9728 MUs). There were no significant d...

  20. Method of synthesizing enriched decaborane for use in generating boron neutron capture therapy pharmaceuticals

    DOE Patents [OSTI]

    Cowan, Robert L. (Idaho Falls, ID); Ginosar, Daniel M. (Idaho Falls, ID); Dunks, Gary B. (Upland, CA)

    2000-01-01T23:59:59.000Z

    A method is described for synthesizing decaborane wherein at least about 90% of the boron atoms in the decaborane are the .sup.10 B isotope, comprising the steps of: (a) reacting boric acid with a C.sub.1 to C.sub.10 alkanol to form a .sup.10 B-alkyl borate wherein at least about 90% of the boron atoms in the boric acid are the .sup.10 B isotope; (b) reducing the .sup.10 B-alkyl borate to form an alkali metal .sup.10 B-borohydride; (c) converting the alkali metal .sup.10 B-borohydride to a .sup.10 B-tetradecahydroundecaborate ion; and (d) converting the .sup.10 B-tetradecahydroundecaborate ion to .sup.10 B-decaborane. Methods of preparing tetradecahydroundecaborate ions and decaborane from alkali metal borohydrides are also described.

  1. Composition-optimized TiO{sub 2}/CdS{sub x}Se{sub 1-x} core/shell nanowire arrays for photoelectrochemical hydrogen generation

    SciTech Connect (OSTI)

    Ai, Guanjie; Mo, Rong; Xu, Hang; Chen, Qian; Yang, Sui; Li, Hongxing, E-mail: hongxinglee@xtu.edu.cn; Zhong, Jianxin [Hunan Key Laboratory for Micro-Nano Energy Materials and Devices, School of Physics and Optoelectronics, Xiangtan University, Hunan 411105 (China)

    2014-11-07T23:59:59.000Z

    Core/shell heterostructured TiO{sub 2}/CdS{sub x}Se{sub 1-x} nanowire arrays (NWAs) were prepared via physical vapor deposition of CdS{sub x}Se{sub 1-x} layer onto the hydrothermal pre-grown TiO{sub 2} NWAs with FTO as conductive substrate. By change the sulfur content (x) in the TiO{sub 2}/CdS{sub x}Se{sub 1-x} nano-composites, it was observed that the light absorption edge can be gradually tuned within a broad wavelength from 540 to 710?nm. When used as photoanodes for hydrogen generation, the as-prepared TiO{sub 2}/CdS{sub x}Se{sub 1-x} NWAs show much higher photoelectroncatalytic activity than the pristine TiO{sub 2} NWAs. Moreover, the TiO{sub 2}/CdS{sub x}Se{sub 1-x} photoelectrode with x?=?0.52 exhibited the highest photocurrent level and outstanding stability, which is more suitable for long-time hydrogen generation. This study may be useful in the design of alloy hetrostructure photoelectrodes with optimal chemical composition toward the more efficient solar conversion devices.

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

    DOE Patents [OSTI]

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

    2009-10-13T23:59:59.000Z

    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.

  3. Method for generating small and ultra small apertures, slits, nozzles and orifices

    DOE Patents [OSTI]

    Khounsary, Ali M. (Hinsdale, IL)

    2012-05-22T23:59:59.000Z

    A method and device for one or more small apertures, slits, nozzles and orifices, preferably having a high aspect ratio. In one embodiment, one or more alternating layers of sacrificial layers and blocking layers are deposited onto a substrate. Each sacrificial layer is made of a material which preferably allows a radiation to substantially pass through. Each blocking layer is made of a material which substantially blocks the radiation.

  4. Optimization Online Digest -- March 2015

    E-Print Network [OSTI]

    Real-Time Dispatchability of Bulk Power Systems with Volatile Renewable Generations ... Optimization of Multiple Receivers Solar Power Tower systems

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

    E-Print Network [OSTI]

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

    2004-01-01T23:59:59.000Z

    about energy consumptionand specific data especially in large building stocks?user complaints and energy consumption arerarely considered in building operation?reduction of energy consumption and operation costsas well as ensuring a high work space... consumption specific heating energy consumption buildings with additional technical usage (control room)without arithmetic mean consumption related to the heated net floor area; data measured one full year: 02-2001 to 02-2002 specific yearly energy...

  6. Optimal control of drug delivery to brain tumors for a PDE driven model using the Galerkin finite element method

    E-Print Network [OSTI]

    Hanson, Floyd B.

    Optimal control of drug delivery to brain tumors for a PDE driven model using the Galerkin finite is used to examine the optimal drug delivery to brain tumors. The PDE driven mathematical model and the drug concentration. An optimal control problem is formulated keeping in mind the primary goals

  7. Method and apparatus for transferring and injecting rf energy from a generator to a resonant load

    DOE Patents [OSTI]

    Hoffert, William J. (Albuquerque, NM)

    1987-01-01T23:59:59.000Z

    Improved apparatus and method are provided for the coherent amplification and injection of radio-frequency (rf) energy into a load cavity using a plurality of amplifier tubes. A plurality of strip line cavities (30, 32, 34, 36, 40, 42, 44) are laterally joined to define a continuous closed cavity (48), with an amplifier tube (50, 52, 54, 56, 58, 60, 62, 64) mounted within each resonant strip cavity. Rf energy is injected into the continuous cavity (48) from a single input (70) for coherent coupling to all of the amplifier tubes for amplification and injection into the load cavity (76).

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

    DOE Patents [OSTI]

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

    2001-01-01T23:59:59.000Z

    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.

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

    DOE Patents [OSTI]

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

    2002-01-01T23:59:59.000Z

    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.

  10. A mathematical method for boiling water reactor control rod programming

    SciTech Connect (OSTI)

    Tokumasu, S.; Hiranuma, H.; Ozawa, M.; Yokomi, M.

    1985-12-01T23:59:59.000Z

    A new mathematical programming method has been developed and utilized in OPROD, an existing computer code for automatic generation of control rod programs as an alternative inner-loop routine for the method of approximate programming. The new routine is constructed of a dual feasible direction algorithm, and consists essentially of two stages of iterative optimization procedures Optimization Procedures I and II. Both follow almost the same algorithm; Optimization Procedure I searches for feasible solutions and Optimization Procedure II optimizes the objective function. Optimization theory and computer simulations have demonstrated that the new routine could find optimum solutions, even if deteriorated initial control rod patterns were given.

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

    DOE Patents [OSTI]

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

    1991-01-01T23:59:59.000Z

    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.

  12. Process metallurgy simulation for metal drawing process optimization by using two-scale finite element method

    SciTech Connect (OSTI)

    Nakamachi, Eiji; Yoshida, Takashi; Yamaguchi, Toshihiko; Morita, Yusuke [Dept. of Biomedical Engineering, Doshisha Univ., Kyotanabe, Kyoto, 610-0394 (Japan); Kuramae, Hiroyuki [Dept. of Technol. Management, Osaka Institute of Technol., Asahiku, Osaka, 535-8585 (Japan); Morimoto, Hideo [Furukawa Electric Co. Ltd., Okano, Nishiku, Yokohama, Kanagawa, 220-0073 (Japan)

    2014-10-06T23:59:59.000Z

    We developed two-scale FE analysis procedure based on the crystallographic homogenization method by considering the hierarchical structure of poly-crystal aluminium alloy metal. It can be characterized as the combination of two-scale structure, such as the microscopic polycrystal structure and the macroscopic elastic plastic continuum. Micro polycrystal structure can be modeled as a three dimensional representative volume element (RVE). RVE is featured as by 333 eight-nodes solid finite elements, which has 216 crystal orientations. This FE analysis code can predict the deformation, strain and stress evolutions in the wire drawing processes in the macro- scales, and further the crystal texture and hardening evolutions in the micro-scale. In this study, we analyzed the texture evolution in the wire drawing processes by our two-scale FE analysis code under conditions of various drawing angles of dice. We evaluates the texture evolution in the surface and center regions of the wire cross section, and to clarify the effects of processing conditions on the texture evolution.

  13. A comparison of small-field tissue phantom ratio data generation methods for an Elekta Agility 6 MV photon beam

    SciTech Connect (OSTI)

    Richmond, Neil, E-mail: neil.richmond@stees.nhs.uk; Brackenridge, Robert

    2014-04-01T23:59:59.000Z

    Tissue-phantom ratios (TPRs) are a common dosimetric quantity used to describe the change in dose with depth in tissue. These can be challenging and time consuming to measure. The conversion of percentage depth dose (PDD) data using standard formulae is widely employed as an alternative method in generating TPR. However, the applicability of these formulae for small fields has been questioned in the literature. Functional representation has also been proposed for small-field TPR production. This article compares measured TPR data for small 6 MV photon fields against that generated by conversion of PDD using standard formulae to assess the efficacy of the conversion data. By functionally fitting the measured TPR data for square fields greater than 4 cm in length, the TPR curves for smaller fields are generated and compared with measurements. TPRs and PDDs were measured in a water tank for a range of square field sizes. The PDDs were converted to TPRs using standard formulae. TPRs for fields of 4 4 cm{sup 2} and larger were used to create functional fits. The parameterization coefficients were used to construct extrapolated TPR curves for 1 1 cm{sup 2}, 2 2-cm{sup 2}, and 3 3-cm{sup 2} fields. The TPR data generated using standard formulae were in excellent agreement with direct TPR measurements. The TPR data for 1 1-cm{sup 2}, 2 2-cm{sup 2}, and 3 3-cm{sup 2} fields created by extrapolation of the larger field functional fits gave inaccurate initial results. The corresponding mean differences for the 3 fields were 4.0%, 2.0%, and 0.9%. Generation of TPR data using a standard PDD-conversion methodology has been shown to give good agreement with our directly measured data for small fields. However, extrapolation of TPR data using the functional fit to fields of 4 4 cm{sup 2} or larger resulted in generation of TPR curves that did not compare well with the measured data.

  14. Method and apparatus for generating high power laser pulses in the two to six micron wavelength range

    DOE Patents [OSTI]

    MacPherson, D.C.; Nelson, L.D.; O`Brien, M.J.

    1996-12-10T23:59:59.000Z

    Apparatus performs a method of generating one or more output laser pulses in a range of 2 to 6 microns. When a plurality of the output laser pulses are generated, a first output pulse has any selected wavelength within the range and a second output pulse is temporally closely spaced relative to the first output pulse and has a chosen wavelength differing from the selected wavelength. An oscillator laser cavity is provided with a tunable oscillator rod capable of generating initial laser pulses within a range of from 750 to 1000 nm, and a tuning element is coupled to the rod. A flashlamp is operable to pump the rod. For two pulse operation, the flashlamp has a given duration. A Q-switch provides the initial laser pulses upon operation of the tuning element and the flashlamp. A Raman device coupled to the rod shifts the wavelength of such initial laser pulse into the range of from 2 to 6 microns to form the output laser pulse having a wavelength within the range. For multiple pulses, a controller causes the Q-switch to provide first and second ones of the initial laser pulses, spaced by a time interval less than the given duration. Also, a selector coupled to the tuning element is operable within such duration to successively select the wavelength of the first output pulse and the chosen wavelength of the second initial pulse. The Raman device is responsive to each of the initial light pulses to generate radiation at first and second Stokes wavelengths, each of said the output laser pulses being radiation at the second Stokes wavelength. 30 figs.

  15. Method and apparatus for electrokinetic co-generation of hydrogen and electric power from liquid water microjets

    DOE Patents [OSTI]

    Saykally, Richard J; Duffin, Andrew M; Wilson, Kevin R; Rude, Bruce S

    2013-02-12T23:59:59.000Z

    A method and apparatus for producing both a gas and electrical power from a flowing liquid, the method comprising: a) providing a source liquid containing ions that when neutralized form a gas; b) providing a velocity to the source liquid relative to a solid material to form a charged liquid microjet, which subsequently breaks up into a droplet spay, the solid material forming a liquid-solid interface; and c) supplying electrons to the charged liquid by contacting a spray stream of the charged liquid with an electron source. In one embodiment, where the liquid is water, hydrogen gas is formed and a streaming current is generated. The apparatus comprises a source of pressurized liquid, a microjet nozzle, a conduit for delivering said liquid to said microjet nozzle, and a conductive metal target sufficiently spaced from said nozzle such that the jet stream produced by said microjet is discontinuous at said target. In one arrangement, with the metal nozzle and target electrically connected to ground, both hydrogen gas and a streaming current are generated at the target as it is impinged by the streaming, liquid spray microjet.

  16. Generating expansion model incorporating compact DC power flow equations

    SciTech Connect (OSTI)

    Nderitu, D.G.; Sparrow, F.T.; Yu, Z. [Purdue Inst. for Interdisciplinary Engineering Studies, West Lafayette, IN (United States)

    1998-12-31T23:59:59.000Z

    This paper presents a compact method of incorporating the spatial dimension into the generation expansion problem. Compact DC power flow equations are used to provide real-power flow coordination equations. Using these equations the marginal contribution of a generator to th total system loss is formulated as a function of that generator`s output. Incorporating these flow equations directly into the MIP formulation of the generator expansion problem results in a model that captures a generator`s true net marginal cost, one that includes both the cost of generation and the cost of transport. This method contrasts with other methods that iterate between a generator expansion model and an optimal power flow model. The proposed model is very compact and has very good convergence performance. A case study with data from Kenya is used to provide a practical application to the model.

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

    SciTech Connect (OSTI)

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

    2014-09-01T23:59:59.000Z

    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.

  18. Optimization Online Digest -- May 2011

    E-Print Network [OSTI]

    An Accelerated Hybrid Proximal Extragradient Method for Convex ... Optimization and homotopy methods for the Gibbs free energy of magmatic mixtures

  19. Empirical comparison of robust, data driven and stochastic optimization

    E-Print Network [OSTI]

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

    2008-01-01T23:59:59.000Z

    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 ...

  20. Heat exchanger design for thermoelectric electricity generation from low temperature flue gas streams

    E-Print Network [OSTI]

    Latcham, Jacob G. (Jacob Greco)

    2009-01-01T23:59:59.000Z

    An air-to-oil heat exchanger was modeled and optimized for use in a system utilizing a thermoelectric generator to convert low grade waste heat in flue gas streams to electricity. The NTU-effectiveness method, exergy, and ...

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

    DOE Patents [OSTI]

    Strauss, C.E.

    1997-11-18T23:59:59.000Z

    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.

  2. Apparatus and method for generating continuous wave 16. mu. m laser radiation using gaseous CF/sub 4/

    DOE Patents [OSTI]

    Telle, J.M.

    1984-05-01T23:59:59.000Z

    Apparatus and method for generating continuous wave 16 ..mu..m laser radiation using gaseous CF/sub 4/. Laser radiation at 16 ..mu..m has been observed in a cooled static cell containing low pressure CF/sub 4/ optically pumped by an approximately 3 W output power c-w CO/sub 2/ laser. The laser cavity employed was a multiple-pass off-axis-path two spherical mirror ring resonator. Unidirectional CF/sub 4/ laser output power at 615 cm/sup -1/ exceeded 2 mW. Computer calculations indicate that for modest pump powers of about 40 W, approximately 1 W of emitted laser radiation at 16 ..mu..m might be obtained.

  3. Apparatus and method for generating continuous wave 16 .mu.m laser radiation using gaseous CF.sub.4

    DOE Patents [OSTI]

    Telle, John M. (Los Alamos, NM)

    1986-01-01T23:59:59.000Z

    Apparatus and method for generating continuous wave 16 .mu.m laser radiation using gaseous CF.sub.4. Laser radiation at 16 .mu.m has been observed in a cooled static cell containing low pressure CF.sub.4 optically pumped by an approximately 3 W output power cw CO.sub.2 laser. The laser cavity employed was a multiple-pass off-axis-path two spherical mirror ring resonator. Unidirectional CF.sub.4 laser output power at 615 cm.sup.-1 exceeded 2 mW. Computer calculations indicate that for modest pump powers of about 40 W, approximately 1 W of emitted laser radiation at 16 .mu.m might be obtained.

  4. A COLUMN GENERATION APPROACH FOR GRAPH COLORING

    E-Print Network [OSTI]

    Grossmann, Ignacio E.

    set in the graph). We use a column generation method for implicit optimization of the linear program based on an integer programming formulation of the graph coloring problem. This formulation, called is an assignment of labels to each vertex such that the endpoints of any edge have different labels. A minimum

  5. Relay Optimization Method

    E-Print Network [OSTI]

    nzhang

    2013-12-17T23:59:59.000Z

    May 2, 2014 ... population, using clockwise-shaped searching vectors instead of the original ... term, we can see the objective value function has many very narrow basins ..... People say we cannot enter the same river twice, but we.

  6. Cleanroom Energy Optimization Methods

    E-Print Network [OSTI]

    Naughton, P.; Schrecengost, R.

    2004-01-01T23:59:59.000Z

    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... (ISO Class 9). These cleanrooms have recirculation air handlers moving millions of cubic feet (cubic meters) of air to transport contamination out of the cleanroom and maintain the room?s cleanliness. Whereas, many in the semiconductor industry...

  7. System and method for generating a displacement with ultra-high accuracy using a fabry-perot interferometer

    DOE Patents [OSTI]

    McIntyre, Timothy J. (Knoxville, TN)

    1994-01-01T23:59:59.000Z

    A system and method for generating a desired displacement of an object, i.e., a target, from a reference position with ultra-high accuracy utilizes a Fabry-Perot etalon having an expandable tube cavity for resolving, with an Iodine stabilized laser, displacements with high accuracy and for effecting (as an actuator) displacements of the target. A mechanical amplifier in the form of a micropositioning stage has a platform and a frame which are movable relative to one another, and the tube cavity of the etalon is connected between the platform and frame so that an adjustment in length of the cavity effects a corresponding, amplified movement of the frame relative to the cavity. Therefore, in order to provide a preselected magnitude of displacement of the stage frame relative to the platform, the etalon tube cavity is adjusted in length by a corresponding amount. The system and method are particularly well-suited for use when calibrating a high accuracy measuring device.

  8. Optimal trajectory design under uncertainty

    E-Print Network [OSTI]

    Saunders, Benjamin R. (Benjamin Robert)

    2012-01-01T23:59:59.000Z

    Reference trajectory design for atmospheric reentry vehicles can be accomplished through trajectory optimization using optimal control techniques. However, this method generally focuses on nominal vehicle performance and ...

  9. Optimization Online - Probabilistic optimization via approximate p ...

    E-Print Network [OSTI]

    W. van vAckooij

    2015-05-27T23:59:59.000Z

    May 27, 2015 ... Probabilistic optimization via approximate p-efficient points and bundle methods. W. van vAckooij(wim.van-ackooij ***at*** edf.fr )

  10. The Next Generation Virgo cluster Survey. V. modelling the dynamics of M87 with the Made-to-Measure method

    E-Print Network [OSTI]

    Zhu, Ling; Mao, Shude; Peng, Eric W; Liu, Chengze; Caldwell, Nelson; Li, Biao; Blakeslee, John P; Cote, Patrick; Cuillandre, Jean-Charles; Durrell, Patrick; Emsellem, Eric; Ferrarese, Laura; Gwyn, Stephen; Jordan, Andres; Lancon, Ariane; Mei, Simona; Munoz, Roberto; Puzi, Thomas

    2014-01-01T23:59:59.000Z

    We study the dynamics of the giant elliptical galaxy M87 from the central to the outermost regions with the made-to-measure (M2M) method. We use a new catalogue of 922 globular cluster line-of- sight velocities extending to a projected radius of 180 kpc (equivalent to 25 M87 effective radii), and SAURON integral field unit data within the central 2.4 kpc. 263 globular clusters, mainly located beyond 40 kpc, are newly observed by the Next Generation Virgo Survey (NGVS). For the M2M modelling, the gravitational potential is taken as a combination of a luminous matter potential with a constant stellar mass-to-light ratio and a dark matter potential modelled as a logarithmic potential. Our best dynamical model returns a stellar mass-to-light ratio in the I band of M/LI = 6.0(+ -0.3) M_sun/L_sun with a dark matter potential scale velocity of 591(+ -50) km/s and scale radius of 42(+ -10) kpc. We determine the total mass of M87 within 180 kpc to be (1.5 + - 0.2) 10^13 M_sun. The mass within 40 kpc is smaller than pr...

  11. Object-oriented Dynamics Modeling for Legged Robot Trajectory Optimization and Control

    E-Print Network [OSTI]

    Stryk, Oskar von

    Object-oriented Dynamics Modeling for Legged Robot Trajectory Optimization and Control Robert. To facilitate the investigation of new concepts of nonlinear model-based optimization and control methods also-level specification of multibody dynamics models using component libraries serves as a basis for generation

  12. Modeling & Optimization An ABB Speciality

    E-Print Network [OSTI]

    generation; transmission systems and substations; network management Low-voltage products; contactors, soft, 2009 | Slide 11 #12;Steps to Achieve Advanced Control / Optimization Build process model: First principle (White Box) Black box Grey box Design controller / optimizer / product Engineer / implement

  13. Practical Experiences from the USE of a Method for Active Functional Tests and Optimization of Coil Energy Recovery Loop Systems in AHUs

    E-Print Network [OSTI]

    Eriksson, J.

    2004-01-01T23:59:59.000Z

    PRACTICAL EXPERIENCES FROM THE USE OF A METHOD FOR ACTIVE FUNCTIONAL TESTS AND OPTIMIZATION OF COIL ENERGY RECOVERY LOOP SYSTEMS IN AHUS. J?rgen Eriksson* * ?F-Installation AB, Box 1551 SE 401 51 G?teborg, Sweden. Summary A method...-commissioning, ventilation, energy, efficiency, EES INTRODUCTION The reason to study coil energy recovery loop systems is that they are very common in Sweden and mainly used in cases with high air flow rates such as in hospitals and pharmaceutical industries. The heat...

  14. Optimization Online - Multimaterial topology optimization by volume ...

    E-Print Network [OSTI]

    R Tavakoli

    2013-11-14T23:59:59.000Z

    Nov 14, 2013 ... The update procedure is based on the gradient flow of the objective functional by a fractional ... descent method, Computer Methods in Applied Mechanics and Engineering, to appear, 2014. ... Mathematical Optimization Society.

  15. Partially Adaptive Stochastic Optimization for Electric Power ...

    E-Print Network [OSTI]

    Jikai Zou

    2015-01-03T23:59:59.000Z

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

  16. General Methodology Combining Engineering Optimization of Primary HVAC & R Plants with Decision Analysis Methods--Part I: Deterministic Analysis

    SciTech Connect (OSTI)

    Jiang, Wei; Reddy, T. A.

    2007-01-31T23:59:59.000Z

    This paper is the first of a two-part sequence that proposes a general methodology for dynamic scheduling and optimal control of complex primary HVAC&R plants, which combines engineering analyses within a practical decision analysis framework by modeling risk attitudes of the operator. The paper was based on work done prior to employment by Battelle.

  17. Optimal Cloning and No Signaling

    E-Print Network [OSTI]

    Sibasish Ghosh; Guruprasad Kar; Anirban Roy

    1999-07-01T23:59:59.000Z

    It is shown that no signaling constraint generates the whole class of 1 $\\rightarrow$ 2 optimal quantum cloning machines of single qubits.

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

    E-Print Network [OSTI]

    Friedmann, Roland

    2009-03-05T23:59:59.000Z

    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 that reactant gases can...

  19. Public Service Commission Authorization to Utilize an Alternative Method of Cost Recovery for Certain Base Load Generation (Mississippi)

    Broader source: Energy.gov [DOE]

    The Senate Bill 2793 authorizes the Public Service Commission (PSC) to utilize an alternative cost recovery for certain base load generation. The PSC is authorized to include in an electric...

  20. Space-based solar power generation using a distributed network of satellites and methods for efficient space power transmission

    E-Print Network [OSTI]

    McLinko, Ryan M.

    Space-based solar power (SSP) generation is being touted as a solution to our ever-increasing energy consumption and dependence on fossil fuels. Satellites in Earth's orbit can capture solar energy through photovoltaic ...

  1. JOURNAL OF OPTIMIZATION THEORY AND APPLICATIONS: Vol. 66, No. 1, JULY 1990 Vectorization of Conjugate-Gradient Methods

    E-Print Network [OSTI]

    Navon, Michael

    of Conjugate-Gradient Methods for Large-Scale Minimization in Meteorology' Io M. NAVON, 2 P. K. H. PHUA, 3 conjugate-gradient methods designed to solve symmetric linear systems of algebraic equations, arising mainly or parallel processing, no such effort was undertaken for the nonlinear conjugate-gradient method for large

  2. EEL6614 Modern Control Theory 1. Catalog Description -Optimization of systems using the calculus of variations,

    E-Print Network [OSTI]

    Fang, Yuguang "Michael"

    5182 3. Course Objectives - Optimization methods and optimal control 4. Instructor Dr. Jacob Hammer a

  3. Optimization Online

    E-Print Network [OSTI]

    Optimization Online is a repository of e-prints about optimization and related topics. Submissions to Optimization Online are moderated by a team of volunteer

  4. Particle Swarm Optimization Based Reactive Power Optimization

    E-Print Network [OSTI]

    Sujin, P R; Linda, M Mary

    2010-01-01T23:59:59.000Z

    Reactive power plays an important role in supporting the real power transfer by maintaining voltage stability and system reliability. It is a critical element for a transmission operator to ensure the reliability of an electric system while minimizing the cost associated with it. The traditional objectives of reactive power dispatch are focused on the technical side of reactive support such as minimization of transmission losses. Reactive power cost compensation to a generator is based on the incurred cost of its reactive power contribution less the cost of its obligation to support the active power delivery. In this paper an efficient Particle Swarm Optimization (PSO) based reactive power optimization approach is presented. The optimal reactive power dispatch problem is a nonlinear optimization problem with several constraints. The objective of the proposed PSO is to minimize the total support cost from generators and reactive compensators. It is achieved by maintaining the whole system power loss as minimum...

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

    DOE Patents [OSTI]

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

    2010-09-07T23:59:59.000Z

    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.

  6. Statistical Learning for Optimal Control of Hybrid Systems Jorge Piovesan, Chaouki Abdallah, Magnus Egerstedt, Herbert Tanner and Yorai Wardi

    E-Print Network [OSTI]

    Egerstedt, Magnus

    inputs [3], and game theoretic approaches [18]. An alternative to classical methods is provided by statisStatistical Learning for Optimal Control of Hybrid Systems Jorge Piovesan, Chaouki Abdallah, Magnus for the optimization of hybrid systems' performance. The basic approach is to generate samples from the family

  7. Non-ambipolar radio-frequency plasma electron source and systems and methods for generating electron beams

    DOE Patents [OSTI]

    Hershkowitz, Noah (Madison, WI); Longmier, Benjamin (Madison, WI); Baalrud, Scott (Madison, WI)

    2009-03-03T23:59:59.000Z

    An electron generating device extracts electrons, through an electron sheath, from plasma produced using RF fields. The electron sheath is located near a grounded ring at one end of a negatively biased conducting surface, which is normally a cylinder. Extracted electrons pass through the grounded ring in the presence of a steady state axial magnetic field. Sufficiently large magnetic fields and/or RF power into the plasma allow for helicon plasma generation. The ion loss area is sufficiently large compared to the electron loss area to allow for total non-ambipolar extraction of all electrons leaving the plasma. Voids in the negatively-biased conducting surface allow the time-varying magnetic fields provided by the antenna to inductively couple to the plasma within the conducting surface. The conducting surface acts as a Faraday shield, which reduces any time-varying electric fields from entering the conductive surface, i.e. blocks capacitive coupling between the antenna and the plasma.

  8. Global control methods for Greenberger-Horne-Zeilinger-state generation on a one-dimensional Ising chain

    SciTech Connect (OSTI)

    Wang Xiaoting; Schirmer, Sophie G. [Department of Applied Maths and Theoretical Physics, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA (United Kingdom); Bayat, Abolfazl; Bose, Sougato [Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT (United Kingdom)

    2010-07-15T23:59:59.000Z

    We discuss how to prepare an Ising chain in a GHZ state using a single global control field only. This model does not require the spins to be individually addressable and is applicable to quantum systems such as cold atoms in optical lattices, some liquid- or solid-state NMR experiments, and many nanoscale quantum structures. We show that GHZ states can always be reached asymptotically from certain easy-to-prepare initial states using adiabatic passage, and under certain conditions finite-time reachability can be ensured. To provide a reference useful for future experimental implementations, three different control strategies to achieve the objective--adiabatic passage, Lyapunov control, and optimal control--are compared, and their advantages and disadvantages discussed, in particular in the presence of realistic imperfections such as imperfect initial state preparation, system inhomogeneity, and dephasing.

  9. Innovative Method for Performance Inspections often save 20-30% through Optimization of Air-Conditioning and Refrigeration

    E-Print Network [OSTI]

    Berglof, K.

    2010-01-01T23:59:59.000Z

    Air-conditioning, refrigeration and heat pump equipment is using 15 to 20% of the electrical energy globally. Many times these systems do not operate in an effective way. The paper present a method for and experience from performance testing...

  10. Optimization Online - Semidefinite optimization, a spectral approach

    E-Print Network [OSTI]

    M.A. van Bossum

    2002-09-30T23:59:59.000Z

    Sep 30, 2002 ... Mathematical optimization involves the construction of methods to solve ... Examples come from electrical design, engineering, control theory, ... at the beginning of the computer technology, it has become more famous.

  11. Optimization Journals, Sites, Societies

    E-Print Network [OSTI]

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

  12. Robust optimization based self scheduling of hydro-thermal Genco ...

    E-Print Network [OSTI]

    Alireza Soroudi

    2013-12-29T23:59:59.000Z

    Dec 29, 2013 ... Abstract: This paper proposes a robust optimization model for optimal self scheduling of a hydro-thermal generating company. The proposed...

  13. Sensitivity to constraints in blackbox optimization

    E-Print Network [OSTI]

    Audet and Le Digabel

    2010-08-26T23:59:59.000Z

    method performing biobjective optimization on the minimization of the objective ... Optimization aims at identifying an argument that minimizes a given objective...

  14. Energy optimization system

    DOE Patents [OSTI]

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

    2013-01-22T23:59:59.000Z

    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.

  15. ISE 536{Fall03: Linear Programming and Extensions September 24, 2003 Lecture 8: Simplex Method, Optimality Conditions

    E-Print Network [OSTI]

    Ordez, Fernando

    ISE 536{Fall03: Linear Programming and Extensions September 24, 2003 Lecture 8: Simplex Method look for the BFS associated to x 2 ; x 4 ; x 5 ? Let us run the algorithm What did simplex do; 2.2 Outline of the Simplex Algorithm Let u ij be the elements of the tableau, i = 0; : : : ; m and j

  16. Estimation of Absolute Free Energies of Hydration using Continuum Methods: Accuracy of Partial Charge Models and Optimization of Nonpolar Contributions

    E-Print Network [OSTI]

    Rizzo, Robert C.

    Estimation of Absolute Free Energies of Hydration using Continuum Methods: Accuracy of Partial, and Irwin D. Kuntz Supporting Information Table S1. Experimental Free Energies of Hydration (Ghyd) in kcal,2-dimethylcyclohexane 1.58 36 trans-1,4-dimethylcyclohexane 2.11 37 ethene 1.28 38 propene 1.32 39 but-1-ene 1.38 40

  17. HYPERBOLIC DIFFERENTIAL The classical Bubnov-Galerkin finite element method is optimal in the sense of the best ap-

    E-Print Network [OSTI]

    California at Berkeley, University of

    -Galerkin method and subsequently discretize the resulting equations by N + 1 equally-sized finite elementsDRAFT Chapter 9 HYPERBOLIC DIFFERENTIAL EQUATIONS The classical Bubnov-Galerkin finite element equations. In many problems of mechan- ics and convective heat transfer where convection dominates diffusion

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

    E-Print Network [OSTI]

    Player, Leah Montgomery

    1994-01-01T23:59:59.000Z

    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...

  19. Global optimization in reduced space

    E-Print Network [OSTI]

    Wechsung, Achim

    2014-01-01T23:59:59.000Z

    Optimization is a key activity in any engineering discipline. Global optimization methods, in particular, strive to solve nonconvex problems, which often arise in chemical engineering, and deterministic algorithms such as ...

  20. Integer optimization in data mining

    E-Print Network [OSTI]

    Shioda, Romy, 1977-

    2003-01-01T23:59:59.000Z

    While continuous optimization methods have been widely used in statistics and data mining over the last thirty years, integer optimization has had very limited impact in statistical computation. Thus, our objective is to ...

  1. Stochastic Optimization of Complex Systems

    SciTech Connect (OSTI)

    Birge, John R. [University of Chicago

    2014-03-20T23:59:59.000Z

    This project focused on methodologies for the solution of stochastic optimization problems based on relaxation and penalty methods, Monte Carlo simulation, parallel processing, and inverse optimization. The main results of the project were the development of a convergent method for the solution of models that include expectation constraints as in equilibrium models, improvement of Monte Carlo convergence through the use of a new method of sample batch optimization, the development of new parallel processing methods for stochastic unit commitment models, and the development of improved methods in combination with parallel processing for incorporating automatic differentiation methods into optimization.

  2. Optimizing SRF Gun Cavity Profiles in a Genetic Algorithm Framework

    SciTech Connect (OSTI)

    Alicia Hofler, Pavel Evtushenko, Frank Marhauser

    2009-09-01T23:59:59.000Z

    Automation of DC photoinjector designs using a genetic algorithm (GA) based optimization is an accepted practice in accelerator physics. Allowing the gun cavity field profile shape to be varied can extend the utility of this optimization methodology to superconducting and normal conducting radio frequency (SRF/RF) gun based injectors. Finding optimal field and cavity geometry configurations can provide guidance for cavity design choices and verify existing designs. We have considered two approaches for varying the electric field profile. The first is to determine the optimal field profile shape that should be used independent of the cavity geometry, and the other is to vary the geometry of the gun cavity structure to produce an optimal field profile. The first method can provide a theoretical optimal and can illuminate where possible gains can be made in field shaping. The second method can produce more realistically achievable designs that can be compared to existing designs. In this paper, we discuss the design and implementation for these two methods for generating field profiles for SRF/RF guns in a GA based injector optimization scheme and provide preliminary results.

  3. General Methodology Combining Engineering Optimization of Primary HVAC and R Plants with Decision Analysis Methods--Part II: Uncertainty and Decision Analysis

    SciTech Connect (OSTI)

    Jiang, Wei; Reddy, T. A.; Gurian, Patrick

    2007-01-31T23:59:59.000Z

    A companion paper to Jiang and Reddy that presents a general and computationally efficient methodology for dyanmic scheduling and optimal control of complex primary HVAC&R plants using a deterministic engineering optimization approach.

  4. Network Optimization for DHT-based Applications Yi Sun, Y. Richard Yang, Xiaobing Zhang, Yang Guo, Jun Li, Kave Salamatian

    E-Print Network [OSTI]

    Paris-Sud XI, Universit de

    a triple hash method to guide the DHT clients sharing resources with peers in proper domains. We have. It is therefore necessary to develop network optimization schemes for controlling the load generated by P2P distribution P2P platform to provide solutions for controlling the spread of the load they generate

  5. Optimized 3D simulation method for modeling of out-of-plane radiation in silicon photonic integrated circuits

    E-Print Network [OSTI]

    Westerveld, W J; Yousefi, M

    2015-01-01T23:59:59.000Z

    We present an accurate and fast 3D simulation scheme for out-of-plane grating couplers, based on two dimensional rigorous (finite difference time domain) grating simulations, the effective index method (EIM), and the Rayleigh-Sommerfeld diffraction formula. In comparison with full 3D FDTD simulations, the rms difference in electric field is below 5% and the difference in power flux is below 3%. A grating coupler for coupling from a silicon-on-insulator photonic integrated circuit to an optical fiber positioned 0.1 mm above the circuit is designed as example.

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

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

    AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level: National5Sales for4,645U.S. DOE Office of Science (SC)Integrated Codes |IsLove Your HomeOverview and HistoryMEMS: Inside theandEnergyMethods

  7. PRIMAL AND DUAL METHODS FOR UNIT COMMITMENT IN A HYDRO-THERMAL POWER SYSTEM

    E-Print Network [OSTI]

    Rmisch, Werner

    PRIMAL AND DUAL METHODS FOR UNIT COMMITMENT IN A HYDRO-THERMAL POWER SYSTEM R. Gollmer1 , A. Moller comprising thermal and pumped-storage hydro units a large-scale mixed-integer optimization model is developed aims at the cost optimal scheduling of on/o decisions and output levels for generating units. The power

  8. Optimal control with adaptive internal dynamics models

    E-Print Network [OSTI]

    Mitrovic, Djordje; Klanke, Stefan; Vijayakumar, Sethu

    2008-01-01T23:59:59.000Z

    Optimal feedback control has been proposed as an attractive movement generation strategy in goal reaching tasks for anthropomorphic manipulator systems. The optimal feedback control law for systems with non-linear dynamics ...

  9. Final Submission to Optimization and Engineering (Paper Number: OPTE 279 NA)

    E-Print Network [OSTI]

    Chen, Wei

    ), and Automobile Design (Bennet 1997). However, the traditional MDO generates deterministic optimal designs, which

  10. REQUEST BY WESTINGHOUSE POWER GENERATION, A FORMER DIVISION OF...

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

    selection and optimization to develop the next generation of gas-fired advanced turbine systems (ATS's) for green field and repowered electricity generation applications....

  11. Polyethylene fiber drawing optimization

    E-Print Network [OSTI]

    Chiloyan, Vazrik

    2011-01-01T23:59:59.000Z

    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 ...

  12. Optimization Neuroimaging'',

    E-Print Network [OSTI]

    Nielsen, Finn ?rup

    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

  13. Optimization Online - Global Optimization of Non-Linear Systems of ...

    E-Print Network [OSTI]

    Nicholas Harkiolakis

    2008-10-20T23:59:59.000Z

    Oct 20, 2008 ... Global Optimization of Non-Linear Systems of Equations by Simulating the ... 10th WSEAS International Conference on Mathematical Methods,...

  14. 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)

    Nagy, Peter

    2013-09-30T23:59:59.000Z

    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.

  15. Optimization Online Digest -- May 2014

    E-Print Network [OSTI]

    Relay Optimization Method Xuyan Wang Dynamic vs. ... A mixed integer programming approach for asset protection during escaped wildfires. Martijn Van der...

  16. Sandia National Laboratories: next generation energy technology

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

    next generation energy technology SWiFT Commissioned to Study Wind Farm Optimization On July 29, 2013, in Energy, Facilities, News, News & Events, Partnership, Renewable Energy,...

  17. Double Smoothing Technique for Constrained Convex Optimization ...

    E-Print Network [OSTI]

    2011-02-27T23:59:59.000Z

    Introduction. In large-scale convex optimization, first-order methods are the .... our work, the function that we optimize using a first-order method and that has the.

  18. Method for generating a crystalline .sup.99 MoO.sub.3 product and the isolation .sup.99m Tc compositions therefrom

    DOE Patents [OSTI]

    Bennett, Ralph G. (Idaho Falls, ID); Christian, Jerry D. (Idaho Falls, ID); Kirkham, Robert J. (Blackfoot, ID); Tranter, Troy J. (Idaho Falls, ID)

    1998-01-01T23:59:59.000Z

    An improved method for producing .sup.99m Tc compositions. .sup.100 Mo metal is irradiated with photons in a particle (electron) accelerator to produce .sup.99 Mo metal which is dissolved in a solvent. A solvated .sup.99 Mo product is then dried to generate a supply of .sup.99 MoO.sub.3 crystals. The crystals are thereafter heated at a temperature which will sublimate the crystals and form a gaseous mixture containing vaporized .sup.99m TcO.sub.3 and vaporized .sup.99m TcO.sub.2 but will not cause the production of vaporized .sup.99 MoO.sub.3. The mixture is then combined with an oxidizing gas to generate a gaseous stream containing vaporized .sup.99m Tc.sub.2 O.sub.7. Next, the gaseous stream is cooled to a temperature sufficient to convert the vaporized .sup.99m Tc.sub.2 O.sub.7 into a condensed .sup.99m Tc-containing product. The product has high purity levels resulting from the use of reduced temperature conditions and ultrafine crystalline .sup.99 MoO.sub.3 starting materials with segregated .sup.99m Tc compositions therein which avoid the production of vaporized .sup.99 MoO.sub.3 contaminants.

  19. Method for generating a crystalline {sup 99}MoO{sub 3} product and the isolation {sup 99m}Tc compositions therefrom

    DOE Patents [OSTI]

    Bennett, R.G.; Christian, J.D.; Kirkham, R.J.; Tranter, T.J.

    1998-09-01T23:59:59.000Z

    An improved method is described for producing {sup 99m}Tc compositions. {sup 100}Mo metal is irradiated with photons in a particle (electron) accelerator to produce {sup 99}Mo metal which is dissolved in a solvent. A solvated {sup 99}Mo product is then dried to generate a supply of {sup 99}MoO{sub 3} crystals. The crystals are thereafter heated at a temperature which will sublimate the crystals and form a gaseous mixture containing vaporized {sup 99m}TcO{sub 3} and vaporized {sup 99m}TcO{sub 2} but will not cause the production of vaporized {sup 99}MoO{sub 3}. The mixture is then combined with an oxidizing gas to generate a gaseous stream containing vaporized {sup 99m}Tc{sub 2}O{sub 7}. Next, the gaseous stream is cooled to a temperature sufficient to convert the vaporized {sup 99m}Tc{sub 2}O{sub 7} into a condensed {sup 99m}Tc-containing product. The product has high purity levels resulting from the use of reduced temperature conditions and ultrafine crystalline {sup 99}MoO{sub 3} starting materials with segregated {sup 99m}Tc compositions therein which avoid the production of vaporized {sup 99}MoO{sub 3} contaminants. 1 fig.

  20. 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)

    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

    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.