Generation and Optimization of Numerical Programs by Symbolic Mathematical Methods
Fateman, Richard J.
Generation and Optimization of Numerical Programs by Symbolic Mathematical Methods Richard J FOR NUMERICAL COMPUTING, May 17-19, 1993 1 #12;5 The Future 21 5.1 Symbolic tools available in some form or numeric . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.2 Recent CAS
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.
HOMOTOPY OPTIMIZATION METHODS FOR GLOBAL OPTIMIZATION
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
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.
Wagner, A.; Wambsgan, M.; Froehlich, S.
2004-01-01T23:59:59.000Z
University Karlsruhe (TH) - Department of Architecture Building Physics and Technical Building Services web-based method to generate specific energyconsumption data for the evaluation and optimisationof building operationAndreas Wagner, Mathias... 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...
Homotopy optimization methods for global optimization.
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.
Model-Based Transient Calibration Optimization for Next Generation...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
Based Transient Calibration Optimization for Next Generation Diesel Engines Model-Based Transient Calibration Optimization for Next Generation Diesel Engines 2005 Diesel Engine...
Optimization of Water Consumption in Second Generation Bioethanol Plants
Grossmann, Ignacio E.
1 Optimization of Water Consumption in Second Generation Bioethanol Plants Mariano Martína optimization of second generation bioethanol production plants from lignocellulosic switchgrass when using
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.
Distributed optimization system and method
Hurtado, John E.; Dohrmann, Clark R.; Robinett, III, Rush D.
2003-06-10T23:59:59.000Z
A search system and method for controlling multiple agents to optimize an objective using distributed sensing and cooperative control. The search agent can be one or more physical agents, such as a robot, and can be software agents for searching cyberspace. The objective can be: chemical sources, temperature sources, radiation sources, light sources, evaders, trespassers, explosive sources, time dependent sources, time independent sources, function surfaces, maximization points, minimization points, and optimal control of a system such as a communication system, an economy, a crane, and a multi-processor computer.
A Redistributed Proximal Bundle Method for Nonconvex Optimization
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.
Fast Quantum Methods for Optimization
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.
OPTIMAL CONTROL APPLICATIONS AND METHODS Optim. Control Appl. Meth. (2008)
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
Robust Methods for Engineering Design Optimization
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
Utility Solar Generation Valuation Methods
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.
Derivative Free Optimization Methods for Optimizing Stirrer ...
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.
NEWTON'S METHOD FOR MULTIOBJECTIVE OPTIMIZATION ...
American Institute of Aeronautics and Astronautics, 1992. [40] Ravindra V Tappeta and John E. Renaud. Interactive multiobjective optimization procedure.
Distributed Generation Dispatch Optimization under VariousElectricity Tariffs
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.
AUTOMATIC GENERATION OF OPTIMAL CONTROLLERS THROUGH MODEL CHECKING TECHNIQUES
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
GLOBAL OPTIMIZATION WITH FILLED FUNCTION METHOD 1 ...
xx
2005-05-24T23:59:59.000Z
May 24, 2005 ... This situation occurs when the feasible set is compact and the ... A standard optimization method could fail to locate the global minimum. The.
Hybrid robust predictive optimization method of power system dispatch
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.
Optimal Placement and Sizing of Distributed Generator Units using Genetic Optimization
-scale production units (e.g. fuel cells, micro-CHPs, photovoltaic panels) and the liberalization of the energyOptimal Placement and Sizing of Distributed Generator Units using Genetic Optimization Algorithms describe how genetic optimization algorithms can be used to find the optimal size and location
Apparatuses and methods for generating electric fields
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.
Method for protecting an electric generator
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.
Biomedical signal processing --application of optimization methods for machine learning
Absil, Pierre-Antoine
Biomedical signal processing -- application of optimization methods for machine learning problems Biomedical signal processing -- application of optimization methods for machi #12;Data mining cocktail-party problem F. Theis Biomedical signal processing -- application of optimization methods for machi #12;Data
Conversion efficiency, scaling and global optimization of high harmonic generation
Falcao-Filho, Edilson L.
Closed form expressions for the high harmonic generation (HHG) conversion efficiency in the plateau and cut-off region are derived showing agreement with previous observations. Application of these results to optimal ...
December 31, 2010 18:54 Optimization Methods and Software griewank Optimization Methods and Software
Schichl, Hermann
for Global Optimization in the COCONUT Environment Hermann Schichl and Mih´aly Csaba Mark´ot. Universit on the algorithmic differentiation methods implemented in the COCONUT Environment for global nonlinear optimization. The COCONUT Environment represents each factorable optimization problem as a directed acyclic graph (DAG
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...
Paris-Sud XI, Université 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
A method for optimal water quality management
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...
Method of generating a surface mesh
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.
OPTIMAL DISTRIBUTED POWER GENERATION UNDER NETWORK LOAD CONSTRAINTS,
Frank, Jason
OPTIMAL DISTRIBUTED POWER GENERATION UNDER NETWORK LOAD CONSTRAINTS, MARJAN VAN DEN AKKER, GABRI 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
Entropy generation and jet engine optimization
Lucia, Umberto
2010-01-01T23:59:59.000Z
In 2009, it was shown that, with an original approach to hydrodynamic cavitation, a phenomenological model was realized in order to compute some of the physical parameters needed for the design of the most common technological applications (turbo-machinery, etc.) with an economical saving in planning because this analysis could allow engineers to reduce the experimental tests and the consequent costs in the design process. Here the same approach has been used to obtain range of some physical quantity for jet engine optimization.
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.
Power generation method including membrane separation
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.
Optimization Online - Preconditioning of Active-Set Newton Methods ...
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 ...
Efficient idempotent methods for optimal control
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
Optimal Fusion Transformations for Linear Optical Cluster State Generation
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.
Method of operating a thermoelectric generator
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.
Plasma plume MHD power generator and method
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.
Simplex Method Math 364: Principles of Optimization, Lecture 7
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
Optimal Control for Generating Quantum Gates in Open Dissipative Systems
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.
Optimal command generation for maneuvering the space station
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...
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.
Electrical motor/generator drive apparatus and method
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.
LEAST-SQUARES FINITE ELEMENT METHODS FOR OPTIMALITY SYSTEMS ARISING
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
Method for generating a plasma wave to accelerate electrons
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.
Method for generating a plasma wave to accelerate electrons
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.
Optimization Online - An MILP-MINLP decomposition method for the ...
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.
Optimization of auxiliary power systems design for large generating units
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.
Plasma generators, reactor systems and related methods
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.
Advanced numerical methods in mesh generation and mesh adaptation
Lipnikov, Konstantine [Los Alamos National Laboratory; Danilov, A [MOSCOW, RUSSIA; Vassilevski, Y [MOSCOW, RUSSIA; Agonzal, A [UNIV OF LYON
2010-01-01T23:59:59.000Z
Numerical solution of partial differential equations requires appropriate meshes, efficient solvers and robust and reliable error estimates. Generation of high-quality meshes for complex engineering models is a non-trivial task. This task is made more difficult when the mesh has to be adapted to a problem solution. This article is focused on a synergistic approach to the mesh generation and mesh adaptation, where best properties of various mesh generation methods are combined to build efficiently simplicial meshes. First, the advancing front technique (AFT) is combined with the incremental Delaunay triangulation (DT) to build an initial mesh. Second, the metric-based mesh adaptation (MBA) method is employed to improve quality of the generated mesh and/or to adapt it to a problem solution. We demonstrate with numerical experiments that combination of all three methods is required for robust meshing of complex engineering models. The key to successful mesh generation is the high-quality of the triangles in the initial front. We use a black-box technique to improve surface meshes exported from an unattainable CAD system. The initial surface mesh is refined into a shape-regular triangulation which approximates the boundary with the same accuracy as the CAD mesh. The DT method adds robustness to the AFT. The resulting mesh is topologically correct but may contain a few slivers. The MBA uses seven local operations to modify the mesh topology. It improves significantly the mesh quality. The MBA method is also used to adapt the mesh to a problem solution to minimize computational resources required for solving the problem. The MBA has a solid theoretical background. In the first two experiments, we consider the convection-diffusion and elasticity problems. We demonstrate the optimal reduction rate of the discretization error on a sequence of adaptive strongly anisotropic meshes. The key element of the MBA method is construction of a tensor metric from hierarchical edge-based error estimates. We conclude that the quasi-optimal mesh must be quasi-uniform in this metric. All numerical experiments are based on the publicly available Ani3D package, the collection of advanced numerical instruments.
Cavity-enhanced second harmonic generation via nonlinear-overlap optimization
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.
Aerodynamic Shape Design of Nozzles Using a Hybrid Optimization Method
Xing, X.Q.
A hybrid design optimization method combining the stochastic method based on simultaneous perturbation stochastic approximation (SPSA) and the deterministic method of Broydon-Fletcher-Goldfarb-Shanno (BFGS) is developed ...
Method for generating hydrogen for fuel cells
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.
Distributed Generation Dispatch Optimization under Various Electricity Tariffs
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
Method for nonlinear optimization for gas tagging and other systems
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.
Optimization Online - Global convergence of splitting methods for ...
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 ...
OPTIMAL OPERATION OF AN INTEGRATED ENERGY PARK INCLUDING FOSSIL FUEL POWER GENERATION,
Stanford University
OPTIMAL OPERATION OF AN INTEGRATED ENERGY PARK INCLUDING FOSSIL FUEL POWER GENERATION, CO2 CAPTURE combustion turbine, and wind generation. Energy park com- ponents are modeled using energy and mass balances. A formal optimization proce- dure is used to determine the optimal hourly dispatch of energy park
Method and apparatus for generating acoustic energy
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.
Second-generation-heliostat optimization studies. Final report
Not Available
1982-05-01T23:59:59.000Z
The objective of this study was to define and quantify cost reductions in the Martin Marietta Denver Aerospace Second Generation Heliostat resulting from design and cost optimization. These cost reductions were based on optimizing the heliostat performance vs. cost and engineering design, and reviewing the design specification in selected technological areas with a goal of removing nonrealistic requirements and eliminating or minimizing overdesign. Specific technological areas investigated were: (1) designing the heliostat for survival strength rather than stiffness and reducing the operational wind requirements as dictated by this design approach; (2) reducing the pointing accuracy and/or beam quality required for some fraction or all of the heliostat field; (3) modifying the operational temperature range; (4) relaxing the rate at which the heliostat must move in the slew mode; (5) using alternate beam safety strategies; (6) analyzing actual wind data for selected sites in the southwest United States vs. the heliostat design specification survival wind requirements; (7) estimating heliostat damage for winds in excess of the design specification over a 30 year period; (8) evaluating the impact of designing the heliostat for higher wind loads; and (9) investigating the applicability to heliostat design of the standard engineering practices for designing buildings.
Linear optimization Linear programming using the Simplex method
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
Optimization and global minimization methods suitable for neural networks
Neumaier, Arnold
Optimization and global minimization methods suitable for neural networks Wlodzislaw Duch and Jerzy Louis Pasteur, Blvd. Sebastien Brant, 67400 Illkirch, France Abstract Neural networks are usually and statistical methods in many applications. For neural networks with predetermined structure, for example
Exact Methods In Fractional Combinatorial Optimization
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...
Distributed Generation Dispatch Optimization under Various Electricity Tariffs
Firestone, Ryan; Marnay, Chris
2007-01-01T23:59:59.000Z
Optimization Common DG devices are reciprocating engines, gas turbines, microturbines, and fuel cells.
Hybrid method for aerodynamic shape optimization in automotive industry
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
A New Method for Mapping Optimization Problems onto Neural Networks
Peterson, Carsten
LU TP 891 March 1989 A New Method for Mapping Optimization Problems onto Neural Networks Carsten for obtaining approximate solutions to difficult optimization problems within the neural network paradigm redundancy that has plagued these problems when using straightforward neural network techniques
A Method for Generating Phyllotaxis over Surfaces of Revolution
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
Centrifugal compressor return channel shape optimization using adjoint method
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 ...
Switching Mode Generation and Optimal Estimation with Application to Skid-Steering
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
Apparatus and method for generating mechanical waves
Allensworth, D.L.; Chen, P.J.
1982-10-25T23:59:59.000Z
Mechanical waves are generated in a medium by subjecting an electromechanical element to an alternating electric field having a frequency which induces mechanical resonance therein and is below any electrical resonance frequency thereof.
OPTIMAL CONTROL APPLICATIONS AND METHODS Optim. Control Appl. Meth., 2004; 25:165180
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
Solving the Unit Commitment Problem in Power Generation by Primal and Dual Methods
Römisch, Werner
Solving the Unit Commitment Problem in Power Generation by Primal and Dual Methods D. Dentcheva1, R. Gollmer1, A. Moller1, W. Romisch1 and R. Schultz2 Abstract. The unit commitment problem in power plant- storage hydro plants a large-scale mixed integer optimization model for unit commitment is developed
A Parallel Inertial Proximal Optimization Method
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 ...
Method for Determining Optimal Residential Energy Efficiency Retrofit Packages
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.
Distributed Generation Dispatch Optimization under Various Electricity Tariffs
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
An Interior Proximal Method in Vector Optimization
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-
Falcon: automated optimization method for arbitrary assessment criteria
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.
Plasma plume MHD power generator and method
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.
A simple method for generating rational triangles
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.
Method and system for radioisotope generation
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.
Robot Locomotion Controller Generation Through Human-Inspired Optimization
Powell, Matthew Joseph
2013-11-13T23:59:59.000Z
This thesis presents an approach to the formal design, optimization and implementation of bipedal robotic walking controllers, with experimental application on two biped platforms. Standard rigid-body modeling is used to construct a hybrid sys- tem...
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
Optimal Projection Method in Sphere Decoding
Ghasemmehdi, Arash
2009-01-01T23:59:59.000Z
An entirely different approach to complexity reduction in sphere decoders is taken. Here we demonstrate that most of the calculations in the standard algorithms are in fact redundant in the sense that the calculated values are never used. This applies to all recursive sphere decoder algorithms, including the numerous variations of the Fincke-Pohst and Schnorr-Euchner strategies. We propose a method, which is applicable to lattices as well as finite constellations, to avoid these redundant calculations, thus reducing the complexity. We emphasize that the algorithms otherwise perform exactly as before, visiting the same points in the same order, and returning the same result. Pseudocode is given to facilitate immediate implementation. In simulation results, it is shown that the relative complexity gain with the proposed add-on goes up linearly as the dimension of the lattice increases. For instance, the complexity is reduced to one fourth for lattices at dimension sixty.
Method and system for SCR optimization
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.
Optimal_Performance_of_Hybrid_Generation_2011-05-24
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
and Economic Analysis of Various Power Generation Resources Coupled with CAES Systems May 17, 2011 DOENETL-20111472 Disclaimer This report was prepared as an account of work...
Optimization Online - PSMG-A Parallel Structured Model Generator ...
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.
Method for using global optimization to the estimation of surface-consistent residual statics
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.
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 ...
Fossil fuel combined cycle power generation method
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.
Optimization of a Small Passive Wind Turbine Generator with Multiobjective Genetic Algorithms
Paris-Sud XI, Université 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
Performance Optimization of a Photovoltaic Generator with an Active Power Filter Application
Paris-Sud XI, Université de
1 Performance Optimization of a Photovoltaic Generator with an Active Power Filter Application. BLORFAN, P. WIRA, D. FLIELLER, G. STURTZER, J. MERCKLE "Performance Optimization of a Photovoltaic (MPPT) for photovoltaic (PV) systems maximizes the power that can be transferred from the PV system
Scanning the Issue Special Issue on Program Generation, Optimization, and
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
A Method for Evaluating Volt-VAR Optimization Field Demonstrations
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.
Design method of dynamical decoupling sequences integrated with optimal control theory
Yutaka Tabuchi; Masahiro Kitagawa
2012-08-26T23:59:59.000Z
A method for synthesizing dynamical decoupling (DD) sequences is presented, which can tailor these sequences to a given set of qubits, environments, instruments, and available resources using partial information of the system. The key concept behind the generation of the DD sequences involves not only extricating the strong dependence on the coupling strengths according to the "optimal control," but also exploiting the "refocus" technique used conventionally to obtain DD sequences. The concept is a generalized one that integrates optimal control and designing of DD sequences.
Biological optimization systems for enhancing photosynthetic efficiency and methods of use
Hunt, Ryan W; Chinnasamy, Senthil; Das, Keshav C; Rolim de Mattos, Erico
2014-02-25T23:59:59.000Z
The present disclosure relates to biological optimization systems for enhancing photosynthetic efficiency and methods of use.
Optimization Methods in Direct and Inverse Alexander G. Ramm1
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
Simulation Methods for Optimal Experimental Design in Systems Biology
Timmer, Jens
Simulation Methods for Optimal Experimental Design in Systems Biology D. Faller Freiburg Center of a biological system, the authors conducted quantitative dynamic experiments from which the system structure and the parameters have to be deduced. Since biological systems have to cope with different environmental conditions
A Comparison of Derivative-Free Optimization Methods for Groundwater
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
Optimized post Gaussian approximation in the background field method
A. Rakhimov; Jae Hyung Yee
2003-08-11T23:59:59.000Z
We have extended the variational perturbative theory based on the back ground field method to include the optimized expansion of Okopinska and the post Gaussian effective potential of Stansu and Stevenson. This new method provides much simpler way to compute the correction terms to the Gausssian effective action (or potential). We have also renormalized the effective potential in 3+1 dimensions by introducing appropriate counter terms in the lagrangian
Branch and Bound for Boolean Optimization and the Generation of Optimality Certificates
Larrosa, Javier
optimization problems of the form (S, cost), where S is a clause set over Boolean variables x1 . . . xn, with an arbi- trary cost function cost : Bn R, and the aim is to find a model A of S such that cost algorithm that can model optimization concepts such as cost-based propagation and cost-based backjumping
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.
Evaluation of Regressive Methods for Automated Generation of Test Trajectories
Cukic, Bojan
. In simple terms,a test trajectoiy is defined as a series of data points, with each (possiblymultidimensional of test generation and the percentage of "acceptable" trajectories, measured by the domain specificEvaluation of Regressive Methods for Automated Generation of Test Trajectories Brian J. Taylor
Frey, Pascal
in many industries such as automotive industries. Structural optimization can be classified into sizing [5 parameter. Bendsře and Sigmund [32] asserted the validity of the SIMP method in view of the mechanics
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 Data Center Home Page on DeliciousPlasma | Department ofEnergy 9 LehmanDepartment ofTribalChapter 4Optima8 * October 2006 Optimize
Optimal distributed power generation under network load constraints
Utrecht, Universiteit
, mainly because of the development 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 (DPG) refers to an electric power source such as solar, wind or combined heat power (CHP) connected
Optimization of THz Radiation Generation from a Laser Wakefield Accelerator
Geddes, Cameron Guy Robinson
used to characterize these THz pulses. Keywords: T-rays generation, CTR, LWFA, Beam diagnostics PACS ultrashort electron bunches with energies up to 1 GeV [1] and energy spreads of a few-percent. Laser pulses interacting with a plasma create accelerated electrons which upon exiting the plasma emit terahertz pulses via
ENERGY PAYBACK OPTIMIZATION OF THERMOELECTRIC POWER GENERATOR SYSTEMS
in distributed power generation and waste heat recovery. Thermoelectrics, due to their moderate energy conversion resistance match with the internal resistance and the thermal resistance match with the heat source and the heat sink. Thermoelectric element aspect ratio and fill factor are found to be key parameters
The Method of Generated Solutions for Numerical Verification of ICE
for verifying numerical code. The exact solution to the set of equations is derived using mathematical methodsThe Method of Generated Solutions for Numerical Verification of ICE Code Amjidanutpan Ramanujam, Christopher Sikorski, Todd Harman* UUCS07006 School of Computing University of Utah Salt Lake City, UT 84112
The Method of Generated Solutions for Numerical Verification of ICE
for verifying numerical code. The exact solution to the set of equations is derived using mathematical methodsThe Method of Generated Solutions for Numerical Verification of ICE Code Amjidanutpan Ramanujam, Christopher Sikorski, Todd Harman* UUCS-07-006 School of Computing University of Utah Salt Lake City, UT 84112
15.053 Optimization Methods in Management Science, Spring 2007
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. ...
Optimal Path Generation for Monocular Simultaneous Localization and Mapping
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...
Optimal Path Generation for Monocular Simultaneous Localization and Mapping
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...
A Spectral Conjugate Gradient Method for Unconstrained Optimization
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.
Control and optimization system and method for chemical looping processes
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.
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.
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.
Guided wave methods and apparatus for nonlinear frequency generation
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.
A gradient optimization method for efficient design of three-dimensional deformation processes
Zabaras, Nicholas J.
A gradient optimization method for efficient design of three-dimensional deformation processes Swagato Acharjee and Nicholas Zabaras Materials Process Design and Control Laboratory, Sibley School processes. The optimization is based on the continuum sensitivity method (CSM). CSM involves differentiation
A polynomial-time interior-point method for conic optimization, with ...
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–
Types of random numbers and Monte Carlo Methods Pseudorandom number generation
Mascagni, Michael
Types of random numbers and Monte Carlo Methods Pseudorandom number generation Quasirandom number generation Conclusions WE246: Random Number Generation A Practitioner's Overview Prof. Michael Mascagni #12;Types of random numbers and Monte Carlo Methods Pseudorandom number generation Quasirandom number
Alternative methods of modeling wind generation using production cost models
Milligan, M.R. [National Renewable Energy Lab., Golden, CO (United States)] [National Renewable Energy Lab., Golden, CO (United States); Pang, C.K. [P Plus Corp., Cupertino, CA (United States)] [P Plus Corp., Cupertino, CA (United States)
1996-08-01T23:59:59.000Z
This paper examines the methods of incorporating wind generation in two production costing models: one is a load duration curve (LDC) based model and the other is a chronological-based model. These two models were used to evaluate the impacts of wind generation on two utility systems using actual collected wind data at two locations with high potential for wind generation. The results are sensitive to the selected wind data and the level of benefits of wind generation is sensitive to the load forecast. The total production cost over a year obtained by the chronological approach does not differ significantly from that of the LDC approach, though the chronological commitment of units is more realistic and more accurate. Chronological models provide the capability of answering important questions about wind resources which are difficult or impossible to address with LDC models.
An Efficient Method for Random Delay Generation in Embedded Software
International Association for Cryptologic Research (IACR)
An Efficient Method for Random Delay Generation in Embedded Software Jean-SÂ´ebastien Coron and Ilya Process Interrupts (rpi) as well as in software by placing "dummy" cy- cles at some points of the program. We give preliminary information on software random delays in Sect. 2. Related work. First detailed
A new method for generating ultraintense and ultrashort laser pulses
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
Comments on “Dual Methods for Nonconvex Spectrum Optimization ...
2007-07-05T23:59:59.000Z
Jul 5, 2007 ... Optimization of Multicarrier Systems”. Tamás Terlaky. ? ... optimization model for the multiuser power control optimization problem, and derived a strong duality ... system and the number of frequency carriers, respectively.
Modeling and Optimization of Next Generation Feedstock Development for Chemical Process
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
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
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
Seismic wave generation systems and methods for cased wells
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.
Oren, Shmuel S.
Unit Commitment and Transmission Switching With N-1 Reliability Kory W. Hedman, Student Member, IEEE present a co-optimization formulation of the generation unit commitment and transmission switching problem to hour. We also show that optimizing the topology can change the optimal unit commitment schedule
Design of a Lithium-ion Battery Pack for PHEV Using a Hybrid Optimization Method
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
Shape optimized headers and methods of manufacture thereof
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.
Zhang, Xuesong
2009-05-15T23:59:59.000Z
This study focuses on developing and evaluating efficient and effective parameter calibration and uncertainty methods for hydrologic modeling. Five single objective optimization algorithms and six multi-objective optimization ...
Various methods of optimizing control pulses for quantum systems with decoherence
?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.
Optimization Methods for Disease Prevention and Epidemic Control ...
2013-09-29T23:59:59.000Z
Department of Electrical Engineering and Computer Science, Vanderbilt University ... is to formulate mathematical optimization models, for identifying which ...
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.
Optimal energy-harvesting cycles for load-driven dielectric generators in plane strain
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.
Methods for Local and Global Optimization Constantinos Voglis
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
Method and apparatus for automated, modular, biomass power generation
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.
Method and apparatus for automated, modular, biomass power generation
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.
Unconstrained paving and plastering method for generating finite element meshes
Staten, Matthew L. (Albuquerque, NM); Owen, Steven J. (Albuquerque, NM); Blacker, Teddy D. (Albuquerque, NM); Kerr, Robert (Albuquerque, NM)
2010-03-02T23:59:59.000Z
Computer software for and a method of generating a conformal all quadrilateral or hexahedral mesh comprising selecting an object with unmeshed boundaries and performing the following while unmeshed voids are larger than twice a desired element size and unrecognizable as either a midpoint subdividable or pave-and-sweepable polyhedra: selecting a front to advance; based on sizes of fronts and angles with adjacent fronts, determining which adjacent fronts should be advanced with the selected front; advancing the fronts; detecting proximities with other nearby fronts; resolving any found proximities; forming quadrilaterals or unconstrained columns of hexahedra where two layers cross; and establishing hexahedral elements where three layers cross.
Fuel processor and method for generating hydrogen for fuel cells
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.
Next Generation Nuclear Plant Methods Technical Program Plan
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.
Next Generation Nuclear Plant Methods Technical Program Plan
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.
Next Generation Nuclear Plant Methods Technical Program Plan -- PLN-2498
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.
Maurer, Helmut
Optimal Control of a Fedbatch Fermentation Process: Numerical Methods, Sufficient Conditions-bang and singular optimal controls in a fedbatch fermentation process are computed for a range of time horizons of the user. In this work we study optimal control of a fedbatch fermentation process. An analytic expression
Optimal Control Using an Algebraic Method for Control-Affine Nonlinear Systems
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
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
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
Chu, Shih-I
2015-01-01T23:59:59.000Z
PHYSICAL REVIEW A 91, 063408 (2015) Optimal control of high-order harmonics for the generation an efficient high-order-harmonic optimal control scheme for the generation of the ultrabroad supercontinuum NEWUOA (NEW Unconstrained Optimization Algorithm). For illustration, the high-order-harmonic generation
Method of generating electricity using an endothermic coal gasifier and MHD generator
Marchant, David D. (Richland, WA); Lytle, John M. (Richland, WA)
1982-01-01T23:59:59.000Z
A system and method of generating electrical power wherein a mixture of carbonaceous material and water is heated to initiate and sustain the endothermic reaction of carbon and water thereby providing a gasified stream containing carbon monoxide, hydrogen and nitrogen and waste streams of hydrogen sulfide and ash. The gasified stream and an ionizing seed material and pressurized air from a preheater go to a burner for producing ionized combustion gases having a temperature of about 5000.degree. to about 6000.degree. F. which are accelerated to a velocity of about 1000 meters per second and passed through an MHD generator to generate DC power and thereafter through a diffuser to reduce the velocity. The gases from the diffuser go to an afterburner and from there in heat exchange relationship with the gasifier to provide heat to sustain the endothermic reaction of carbon and water and with the preheater to preheat the air prior to combustion with the gasified stream. Energy from the afterburner can also be used to energize other parts of the system.
From Physics Model to Results: An Optimizing Framework for Cross-Architecture Code Generation
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Blazewicz, Marek; Hinder, Ian; Koppelman, David M.; Brandt, Steven R.; Ciznicki, Milosz; Kierzynka, Michal; Löffler, Frank; Schnetter, Erik; Tao, Jian
2013-01-01T23:59:59.000Z
Starting from a high-level problem description in terms of partial differential equations using abstract tensor notation, theChemoraframework discretizes, optimizes, and generates complete high performance codes for a wide range of compute architectures. Chemora extends the capabilities of Cactus, facilitating the usage of large-scale CPU/GPU systems in an efficient manner for complex applications, without low-level code tuning. Chemora achieves parallelism through MPI and multi-threading, combining OpenMP and CUDA. Optimizations include high-level code transformations, efficient loop traversal strategies, dynamically selected data and instruction cache usage strategies, and JIT compilation of GPU code tailored to the problem characteristics. The discretization is based onmore »higher-order finite differences on multi-block domains. Chemora's capabilities are demonstrated by simulations of black hole collisions. This problem provides an acid test of the framework, as the Einstein equations contain hundreds of variables and thousands of terms.« less
From Physics Model to Results: An Optimizing Framework for Cross-Architecture Code Generation
Marek Blazewicz; Ian Hinder; David M. Koppelman; Steven R. Brandt; Milosz Ciznicki; Michal Kierzynka; Frank Löffler; Erik Schnetter; Jian Tao
2013-07-24T23:59:59.000Z
Starting from a high-level problem description in terms of partial differential equations using abstract tensor notation, the Chemora framework discretizes, optimizes, and generates complete high performance codes for a wide range of compute architectures. Chemora extends the capabilities of Cactus, facilitating the usage of large-scale CPU/GPU systems in an efficient manner for complex applications, without low-level code tuning. Chemora achieves parallelism through MPI and multi-threading, combining OpenMP and CUDA. Optimizations include high-level code transformations, efficient loop traversal strategies, dynamically selected data and instruction cache usage strategies, and JIT compilation of GPU code tailored to the problem characteristics. The discretization is based on higher-order finite differences on multi-block domains. Chemora's capabilities are demonstrated by simulations of black hole collisions. This problem provides an acid test of the framework, as the Einstein equations contain hundreds of variables and thousands of terms.
A new method to generate dust with astrophysical properties
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.
Development of Combinatorial Methods for Alloy Design and Optimization
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
An Optimal Power Flow (OPF) Method with Improved Power System Stability
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
Performance of Hybrid Methods for Large-Scale Unconstrained Optimization as Applied
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
On the method of optimal portfolio choice by cost-efficiency
Rüschendorf, Ludger
On the method of optimal portfolio choice by cost-efficiency Ludger R¨uschendorf*, 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
Evaluation of Parallel Decomposition Methods for Biomechanical Optimizations
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
GRADIENT-BASED STOCHASTIC OPTIMIZATION METHODS IN BAYESIAN EXPERIMENTAL DESIGN
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 ...
A doubly stabilized bundle method for nonsmooth convex optimization
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 ...
An Improved Lagrangian Relaxation Method for VLSI Combinational Circuit Optimization
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 ...
Oh, Bong T.
2010-01-16T23:59:59.000Z
, vibration/noise control, and fluid mechanics, simultaneously. Higher product quality, less developing time and lower manufacturing cost will be achieved through a balanced and organic MDO method. In this paper, numerical stress analysis, optimization method...
Oh, Bong T.
2010-01-16T23:59:59.000Z
, vibration/noise control, and fluid mechanics, simultaneously. Higher product quality, less developing time and lower manufacturing cost will be achieved through a balanced and organic MDO method. In this paper, numerical stress analysis, optimization method...
Capacitive charge generation apparatus and method for testing circuits
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.
Method of generating hydrogen by catalytic decomposition of water
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.
Capacitive charge generation apparatus and method for testing circuits
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.
Optimization Online Digest -- January 2015
Object-Parallel Infrastructure for Implementing First-Order Methods, with an Example ... Partially Adaptive Stochastic Optimization for Electric Power Generation ...
Thermoelectric generator cooling system and method of control
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.
Methods and apparatus for cooling wind turbine generators
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.
Generation and Optimization of Test cases for Object-Oriented Software Using State Chart Diagram
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, ...
Compensating Customer-Generators: A taxonomy describing methods of compensating
Hughes, Larry
, investment in grid-connected generation capacity is growing at a faster rate than off-grid applications (IEA
Chu, Shih-I
-dimensional quantum study of the coherent control of high-order harmonic generation HHG processes in intense pulsed.65.Ky, 32.80.Wr The study of coherent control of atomic and molecular processes is a subject of muchOptimization of high-order harmonic generation by genetic algorithm and wavelet time
Optimal selection of on-site generation with combined heat andpower applications
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.
DYNAMIC EMBEDDED OPTIMIZATION AND SHOOTING METHODS FOR POWER
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
Hybrid methods for interplanetary low-thrust trajectory optimization
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...
AM 121: Intro to Optimization Models and Methods
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
MASTER'S THESIS A method for simulation based optimization
Patriksson, Michael
;Matematiskt centrum Göteborg 2007 #12;Abstract The background of this thesis was the GMMC Combustion Engine-projektet Combustion Engine Optimization som inleddes under vĺren 2006. En global optimeringsalgoritm som använder sig for Strategic Research (SSF). All members in GMMC Combustion Engine Optimiza- tion should be mentioned, Mattias
Matrix Eigenvalue Problems, Jacobi-type Methods, and Optimization on Graf3mannians *
Moore, John Barratt
Matrix Eigenvalue Problems, Jacobi-type Methods, and Optimization on Graf3mannians * K. Hiiper-algorithm and related schemes. With the advent of parallel machines, however, interest in Jacobi- type methods has-based methods. Another reason for the current popularity of Jacobi methods lies in their superior accuracy. 1
DifferentialGeometric Methods: a Powerful Set of New Tools for Optimal Control
Sussmann, Hector
such as static and dynamic stabilization, linearÂquadratic control, linear timeÂoptimal control, various nonlinear systems â?? x = f(x; u), possibly linear in the control u, posssibly required to satisfy someDifferentialÂGeometric Methods: a Powerful Set of New Tools for Optimal Control H'ector J. Sussmann
Use of Short-cut Methods to Analyse Optimal Operation of Petlyuk Distillation Columns
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
Use of Shortcut Methods to Analyse Optimal Operation of Petlyuk Distillation Columns
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
Method and apparatus for generating low energy nuclear particles
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.
Method and apparatus for generating low energy nuclear particles
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.
survey of trust-region derivative free optimization methods
2007-06-14T23:59:59.000Z
Department of Mathematics & Institute of Applied Mathematics ...... Computer Methods in Applied Mechanics and Engineering, 190 (2001), 5297–5310.
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 ...
The Fourier method for tri-atomic systems in the search for the optimal coordinate system
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
Successive Backward Sweep Methods for Optimal Control of Nonlinear Systems with Constraints
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...
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 ...
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...
Sparse Models and Methods for Optimal Instruments with an Application to Eminent Domain
Belloni, Alexandre
2011-07-12T23:59:59.000Z
We develop results for the use of LASSO and Post-LASSO methods to form first-stage predictions and estimate optimal instruments in linear instrumental variables (IV) models with many instruments, p, that apply even when p ...
Bertsimas, Dimitris J.
Our interest lies in solving sum of squares (SOS) relaxations of large-scale unconstrained polynomial optimization problems. Because interior-point methods for solving these problems are severely limited by the large-scale, ...
Structure-exploiting interior point methods for security constrained optimal power flow problems
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 ...
Municipal Solid Waste Generation: Feasibility of Reconciling Measurement Methods
Schneider, Shelly H.
2014-07-25T23:59:59.000Z
Federal regulations require state governments provide for the safe and environmentally sound management of wastes generated within their borders. In order to effectively manage wastes, the types and quantities of material requiring management needs...
Cold weather hydrogen generation system and method of operation
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.
Thermoelectric generator and method for the fabrication thereof
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.
Thermoelectric generator and method for the fabrication thereof
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.
Effective reentry methods reduce costs and optimize production
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.
Comparison of heuristic methods for reliability optimization of series-parallel systems
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...
Chen, Zaigao; Wang, Jianguo [Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an, Shaanxi 710049 (China) [Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an, Shaanxi 710049 (China); Northwest Institute of Nuclear Technology, P.O. Box 69-12, Xi'an, Shaanxi 710024 (China); Wang, Yue; Qiao, Hailiang; Zhang, Dianhui [Northwest Institute of Nuclear Technology, P.O. Box 69-12, Xi'an, Shaanxi 710024 (China)] [Northwest Institute of Nuclear Technology, P.O. Box 69-12, Xi'an, Shaanxi 710024 (China); Guo, Weijie [Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an, Shaanxi 710049 (China)] [Key Laboratory for Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University, Xi'an, Shaanxi 710049 (China)
2013-11-15T23:59:59.000Z
Optimal design method of high-power microwave source using particle simulation and parallel genetic algorithms is presented in this paper. The output power, simulated by the fully electromagnetic particle simulation code UNIPIC, of the high-power microwave device is given as the fitness function, and the float-encoding genetic algorithms are used to optimize the high-power microwave devices. Using this method, we encode the heights of non-uniform slow wave structure in the relativistic backward wave oscillators (RBWO), and optimize the parameters on massively parallel processors. Simulation results demonstrate that we can obtain the optimal parameters of non-uniform slow wave structure in the RBWO, and the output microwave power enhances 52.6% after the device is optimized.
Geometry Optimization with QM/MM, ONIOM, and Other Combined Methods. I. Microiterations
Schlegel, H. Bernhard
Geometry Optimization with QM/MM, ONIOM, and Other Combined Methods. I. Microiterations Abstract: Hybrid energy methods such as QM/MM and ONIOM, that combine different levels of theory into one of theory and the larger, remaining region treated by an inexpensive method such as molecular mechanics (MM
A Numerical Method to solve Optimal Transport Problems with Coulomb Cost
Jean-David Benamou; Guillaume Carlier; Luca Nenna
2015-05-07T23:59:59.000Z
In this paper, we present a numerical method, based on iterative Bregman projections, to solve the optimal transport problem with Coulomb cost. This is related to the strong interaction limit of Density Functional Theory. The first idea is to introduce an entropic regularization of the Kantorovich formulation of the Optimal Transport problem. The regularized problem then corresponds to the projection of a vector on the intersection of the constraints with respect to the Kullback-Leibler distance. Iterative Bregman projections on each marginal constraint are explicit which enables us to approximate the optimal transport plan. We validate the numerical method against analytical test cases.
Optimization Online - Nonsmooth Methods for Control Design with ...
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 ...
Optimization Online - Efficient First-Order Methods for Linear ...
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: ...
Optimal Spectral-Galerkin Methods Using Generalized Jacobi ...
2006-01-07T23:59:59.000Z
Dec 1, 2004 ... We extend the definition of the classical Jacobi polynomials ... KEY WORDS: Generalized Jacobi polynomials; spectral-Galerkin method;.
A Reliable Affine Relaxation Method for Global Optimization
Ninin, Messine, Hansen
2012-10-23T23:59:59.000Z
Oct 23, 2012 ... ¶The research of Pierre Hansen was supported by an NSERC Operating Grant as ...... Optimisation Methods & Software, 24(4-5):687–708, Jan.
Optimization Online - A Reliable Affine Relaxation Method for Global ...
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 ...
Optimization Online - On the equivalence of the method of conjugate ...
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 ...
Optimization Online - $S_{0.5}$ Regularization Methods and Fixed ...
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*** ...
Method for generating long-range correlations for large systems Hernan A. Makse,1
Stanley, H. Eugene
Method for generating long-range correlations for large systems HernaÂ´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
Global methods for optimizing over the efficient set
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.
Randomized coordinate descent methods for big data optimization
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 ...
Alternating direction methods for non convex optimization with ...
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 ...
Constraining climate model properties using optimal fingerprint detection methods
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 ...
Assessing the Potential of Interior Methods for Nonlinear Optimization
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.
Methods for generating or increasing revenues from crops
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.
Wind turbine/generator set and method of making same
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.
Method for changing removable bearing for a wind turbine generator
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.
XFEL diffraction: Developing processing methods to optimize 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. Shotsmore »with 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
Inverse-design and optimization methods for centrifugal pump impellers
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
Method of optimizing performance of Rankine cycle power plants
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).
An adaptive accelerated first-order method for convex optimization
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.
Comparison of two optimization methods to derive energy parameters for protein folding
Domany, Eytan
Comparison of two optimization methods to derive energy parameters for protein folding: perceptron potential, perceptron, Zscore 1 #12; Abstract Two methods were proposed recently to derive energy, by means of a perceptron learning scheme, energy parameters such that the native conformations have lower
Comparison of Global Optimization Methods for Drag Reduction in the Automotive Industry
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
Methods, systems, and computer program products for network firewall policy optimization
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.
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
A SPOTLIGHT SEARCH METHOD FOR MULTI-CRITERIA OPTIMIZATION PROBLEMS Jung-Ho Lewe
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
Numerical study of a matrix-free trust-region SQP method for equality constrained optimization.
Heinkenschloss, Matthias (Rice University, Houston, TX); Ridzal, Denis; Aguilo, Miguel Antonio
2011-12-01T23:59:59.000Z
This is a companion publication to the paper 'A Matrix-Free Trust-Region SQP Algorithm for Equality Constrained Optimization' [11]. In [11], we develop and analyze a trust-region sequential quadratic programming (SQP) method that supports the matrix-free (iterative, in-exact) solution of linear systems. In this report, we document the numerical behavior of the algorithm applied to a variety of equality constrained optimization problems, with constraints given by partial differential equations (PDEs).
Optimization Online - All Areas Submissions - January 2015
Partially Adaptive Stochastic Optimization for Electric Power Generation Expansion ... Object-Parallel Infrastructure for Implementing First-Order Methods, with an ...
Method of generating hydrogen gas from sodium borohydride
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.
Generation IV PR and PP Methods and Applications
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.
Computational Methods for Nucleosynthesis and Nuclear Energy Generation
W. R. Hix; F. -K. Thielemann
1999-06-29T23:59:59.000Z
This review concentrates on the two principle methods used to evolve nuclear abundances within astrophysical simulations, evolution via rate equations and via equilibria. Because in general the rate equations in nucleosynthetic applications form an extraordinarily stiff system, implicit methods have proven mandatory, leading to the need to solve moderately sized matrix equations. Efforts to improve the performance of such rate equation methods are focused on efficient solution of these matrix equations, by making best use of the sparseness of these matrices. Recent work to produce hybrid schemes which use local equilibria to reduce the computational cost of the rate equations is also discussed. Such schemes offer significant improvements in the speed of reaction networks and are accurate under circumstances where calculations with complete equilibrium fail.
Lavaei, Javad
1 Abstract-- The optimal power flow (OPF) problem is a critical problem for power generation flow on the line P: vector of active power generations Q: vector of reactive power generations L: loss/reactive power generation limits. Given the practical importance of the problem, a great many studies have been
Marchon, Cassia Helena
2008-10-10T23:59:59.000Z
This dissertation contains three essays. The first and second essays examine intergenerational mobility in earnings in Brazil using a data set spanning three generations. I use data from PNAD{a nationally representative household survey in Brazil. I...
Methods and devices for generation of broadband pulsed radiation
Borguet, Eric; Isaienko, Oleksandr
2013-05-14T23:59:59.000Z
Methods and apparatus for non-collinear optical parametric ampliffication (NOPA) are provided. Broadband phase matching is achieved with a non-collinear geometry and a divergent signal seed to provide bandwidth gain. A chirp may be introduced into the pump pulse such that the white light seed is amplified in a broad spectral region.
Method of inhibiting dislocation generation in silicon dendritic webs
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.
System and method for generating current by selective electron heating
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.
Systems and methods for generation of hydrogen peroxide vapor
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.
Selecting fines recycle methods to optimize fluid bed combustor performance
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%.
Biological optimization systems for enhancing photosynthetic efficiency and methods of use
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.
Electrochemical methods for generation of a biological proton motive force
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.
System and method of cylinder deactivation for optimal engine torque-speed map operation
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.
Photo-voltaic power generating means and methods
Kroger, Ferdinand A. (Santa Monica, CA); Rod, Robert L. (Marina del Rey, CA); Panicker, M. P. Ramachandra (Camarillo, CA)
1983-08-23T23:59:59.000Z
A photo-voltaic power cell based on a photoelectric semiconductor compound and the method of using and making the same. The semiconductor compound in the photo-voltaic power cell of the present invention can be electrolytically formed at a cathode in an electrolytic solution by causing discharge or decomposition of ions or molecules of a non-metallic component with deposition of the non-metallic component on the cathode and simultaneously providing ions of a metal component which discharge and combine with the non-metallic component at the cathode thereby forming the semiconductor compound film material thereon. By stoichiometrically adjusting the amounts of the components, or otherwise by introducing dopants into the desired amounts, an N-type layer can be formed and thereafter a P-type layer can be formed with a junction therebetween. The invention is effective in producing homojunction semiconductor materials and heterojunction semiconductor materials. The present invention also provides a method of using three electrodes in order to form the semiconductor compound material on one of these electrodes. Various examples are given for manufacturing different photo-voltaic cells in accordance with the present invention.
Photo-voltaic power generating means and methods
Kroger, Ferdinand A. (Los Angeles, CA); Rod, Robert L. (Marina del Rey, CA); Panicker, Ramachandra M. P. (Camarillo, CA); Knaster, Mark B. (Ambler, PA)
1984-01-10T23:59:59.000Z
A photo-voltaic power cell based on a photoelectric semiconductor compound and the method of using and making the same. The semiconductor compound in the photo-voltaic power cell of the present invention can be electrolytically formed at a cathode in an electrolytic solution by causing discharge or decomposition of ions or molecules of a non-metallic component with deposition of the non-metallic component on the cathode and simultaneously providing ions of a metal component which discharge and combine with the non-metallic component at the cathode thereby forming the semiconductor compound film material thereon. By stoichiometrically adjusting the amounts of the components, or otherwise by introducing dopants into the desired amounts, an N-type layer can be formed and thereafter a P-type layer can be formed with a junction therebetween. The invention is effective in producing homojunction semiconductor materials and heterojunction semiconductor materials. The present invention also provides a method of using three electrodes in order to form the semiconductor compound material on one of these electrodes. Various examples are given for manufacturing different photo-voltaic cells in accordance with the present invention.
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.
Efficient generation and optimization of stochastic template banks by a neighboring cell algorithm
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..
A Pareto-Optimal Refinement Method for Protein Design Lucas Gregorio Nivo n1.
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: Nivo´n LG, Moretti R, Baker D (2013) A Pareto-Optimal Refinement Method
Performance of Enriched Methods for Large Scale Unconstrained Optimization as applied to
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
Optimization of Virus Imprinting Methods To Improve Selectivity and Reduce Nonspecific Binding
Rubloff, Gary W.
Optimization of Virus Imprinting Methods To Improve Selectivity and Reduce Nonspecific Binding such as viruses are imprinted, special consideration must be taken to ensure the formation of complementary and release of the virus template after cross-linking. In this study, tobacco mosaic virus (TMV) was used
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
Engineering Optimization, 2002, Vol. 34(1), pp. 6581 A VARIATION-BASED METHOD FOR PRODUCT
Chen, Wei
, standardization, or modularization among different products or product lines.'' The end result is a proliferationEngineering Optimization, 2002, Vol. 34(1), pp. 6581 A VARIATION-BASED METHOD FOR PRODUCT FAMILY; b Integrated Design Automation Laboratory (IDEAL), Department of Mechanical Engineering, University
A Method for Optimizing Waste Collection Using Mathematical Programming: A Buenos Aires Case Study
Bonomo, Flavia
A Method for Optimizing Waste Collection Using Mathematical Programming: A Buenos Aires Case Study Computación, FCEyN, Universidad de Buenos Aires, Argentina 2 CONICET, Argentina 3 Departamento de Matemática, FCEyN, Universidad de Buenos Aires, Argentina 4 Departamento de Ingeniería Industrial, FCFM
Different electrode configurations to optimize performance of multi- electrode microbial fuel cells a b s t r a c t Scaling-up of microbial fuel cells (MFCs) for practical applications requires compact. Introduction Microbial fuel cells (MFCs) are an emerging method for achieving sustainable wastewater treatment
Improved method for calculating the radiation heat generation in the BOR-60 reactor
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.
An Electron Beam Method for Creating Combina-torial Libraries: Application to Next Generation
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
An enhanced algorithm for protocol conformance test sequence generation based on the UIO method
Allada, Ravindra
1993-01-01T23:59:59.000Z
An Enhanced Algorithm for Protocol Conformance Test Sequence Generation Based on the UIO Method. (December 1993) Ravindra Allada, B.E., Osmania University, Hyderabad, India Chair of Advisory Committee: Dr. Hosame Abu-Amara A computer protocol is a...
Relative entropy and optimization-driven coarse-graining methods in VOTCA
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Mashayak, S. Y.; Jochum, Mara N.; Koschke, Konstantin; Aluru, N. R.; Rühle, Victor; Junghans, Christoph; Huang, Xuhui
2015-07-20T23:59:59.000Z
We discuss recent advances of the VOTCA package for systematic coarse-graining. Two methods have been implemented, namely the downhill simplex optimization and the relative entropy minimization. We illustrate the new methods by coarse-graining SPC/E bulk water and more complex water-methanol mixture systems. The CG potentials obtained from both methods are then evaluated by comparing the pair distributions from the coarse-grained to the reference atomistic simulations.We have also added a parallel analysis framework to improve the computational efficiency of the coarse-graining process.
Relaying and Controls for Generator Applications
Massey, G. W.
2000-01-01T23:59:59.000Z
operation. This paper provides an overview of generators, relaying and controls. Typical operational procedures are discussed to provide a framework for optimizing generator performance. Additionally, methods of providing electrical protection and control...
Optimal suppression of defect generation during a passage across a quantum critical point
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.
Generator-Absorber heat exchange transfer apparatus and method using an intermediate liquor
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.
Method for generating high-energy and high repetition rate laser pulses from CW amplifiers
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.
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.
DeltaSky: Optimal Maintenance of Skyline Deletions without Exclusive Dominance Region Generation
Egecioglu, Ă?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
Tensor product methods and entanglement optimization for ab initio quantum chemistry
Szilárd Szalay; Max Pfeffer; Valentin Murg; Gergely Barcza; Frank Verstraete; Reinhold Schneider; Örs 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.
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.
Device and method for generating a beam of acoustic energy from a borehole, and applications thereof
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.
Device and method for generating a beam of acoustic energy from a borehole, and applications thereof
Vu, Cung Khac; Sinha, Dipen N.; Pantea, Cristian; Nihei, Kurt T.; Schmitt, Denis P.; Skelt, Chirstopher
2013-10-15T23:59:59.000Z
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 range and the second frequency, and wherein the non-linear medium has a velocity of sound between 100 m/s and 800 m/s.
Optimization of three-color laser field for the generation of single ultrashort attosecond pulse
Chu, Shih-I; Liu, I-Lin; Li, Peng-Cheng
2011-11-09T23:59:59.000Z
We present an efficient and realizable scheme for the generation of an ultrashort single attosecond (as) pulse. The feasibility of such a scheme is demonstrated by solving accurately the time-dependent Schrödinger equation using the time...
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.
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.
Generation of pseudostates for the Dirac-Coulomb Hamiltonian using the variational method
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...
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.
Kusiak, Andrew
1 Abstract--A bi-objective optimization model of power and power changes generated by a wind prediction, power ramp rate, data mining, wind turbine operation strategy, generator torque, blade pitch to variations in wind speed, wind farms exhibit different characteristics from conventional power plants. Two
Subtask 1.24 - Optimization of Cooling Water Resources for Power Generation
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.
Suleimanov, Yury V
2015-01-01T23:59:59.000Z
We present a simple protocol which allows fully automated discovery of elementary chemical reaction steps using in cooperation single- and double-ended transition-state optimization algorithms - the freezing string and Berny optimization methods, respectively. To demonstrate the utility of the proposed approach, the reactivity of several systems of combustion and atmospheric chemistry importance is investigated. The proposed algorithm allowed us to detect without any human intervention not only "known" reaction pathways, manually detected in the previous studies, but also new, previously "unknown", reaction pathways which involve significant atom rearrangements. We believe that applying such a systematic approach to elementary reaction path finding will greatly accelerate the possibility of discovery of new chemistry and will lead to more accurate computer simulations of various chemical processes.
Optimization of a Microscale, Axial-Flux, Permanent-Magnet Generator D. P. Arnold1*
-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
Stresa, Italy, 26-28 April 2006 OPTIMIZATION OF PIEZOELECTRIC ELECTRICAL GENERATORS
Boyer, Edmond
is on the transformation of mechanical vibrations, existing almost everywhere. In this field, electromagnetic. INTRODUCTION The proliferation of transducers and sensors integrated in many systems raises the problem in safety monitoring applications. This explains the growing interest in miniature electrical generators
Optimal Two-Tier Forecasting Power Generation Model in Smart Grids
Iyengar, S. S.
(DRRs), advanced metering infrastruc- ture (AMI), energy storage devices, electric vehicles, demand response programs, energy efficiency programs, and home area networks (HANs) [1,2]. Furthermore, recent and electricity consumers and improve mar- ket efficiency [3]. In a related context, con- ventional generation
Design and optimization of a bi-axial vibration-driven electromagnetic generator
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?˛).
Optimal sizing study of hybrid wind/PV/diesel power generation unit
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)
Method and apparatus for generating radiation utilizing DC to AC conversion with a conductive front
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.
Apparatus and method for recharging a string a avalanche transistors within a pulse generator
Fulkerson, E. Stephen (Livermore, CA)
2000-01-01T23:59:59.000Z
An apparatus and method for recharging a string of avalanche transistors within a pulse generator is disclosed. A plurality of amplification stages are connected in series. Each stage includes an avalanche transistor and a capacitor. A trigger signal, causes the apparatus to generate a very high voltage pulse of a very brief duration which discharges the capacitors. Charge resistors inject current into the string of avalanche transistors at various points, recharging the capacitors. The method of the present invention includes the steps of supplying current to charge resistors from a power supply; using the charge resistors to charge capacitors connected to a set of serially connected avalanche transistors; triggering the avalanche transistors; generating a high-voltage pulse from the charge stored in the capacitors; and recharging the capacitors through the charge resistors.
Parametric Study of PV Arc-Fault Generation Methods and Analysis of Conducted DC Spectrum
Parametric Study of PV Arc-Fault Generation Methods and Analysis of Conducted DC Spectrum Jay photovoltaic (PV) direct current (DC) arc- fault detectors use the frequency content of the PV system to detect by different PV arcs in the field. In this investigation, we (a) discuss the differences in establishing
Melcher, R.G.; Borders, R.A.; Coyne, L.B.
1986-03-01T23:59:59.000Z
The purpose of this study was to optimize monitoring methods and to investigate new technology for the determination of low levels of acrylonitrile (0.05 to 5 ppm) in workplace atmospheres. In the first phase of the study, a dynamic atmosphere generation system was developed to produce low levels of acrylonitrile in simulated workplace atmospheres. Various potential sorbents were investigated in the second phase, and the candidate methods were compared in a laboratory validation study over a concentration range from 0.05 to 5 ppm acrylonitrile in the presence of potential interferences and under relative humidity conditions from 30% to 95% RH. A collection tube containing 600 mg Pittsburgh coconut base charcoal was found to be the optimum tube for sampling for a full 8 -hr shift. No breakthrough was observed over the concentrations and humidities tested. The recovery was 91.3% with a total relative precision of +/-21% over the test range, and the recovery was not affected by storage for up to five weeks.
Optimization Methods and Software Vol. 00, No. 00, Month 200x, 118
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
15.093 / 2.098 Optimization Methods (SMA 5213), Fall 2004
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 ...
Cantrell, Tyler Lee
2015-05-06T23:59:59.000Z
of common positron emitters used for PET imaging ……….. 4 Table 2 List of positron labelled radiopharmaceuticals for PET……………….. 5 Table 3 The radioactive decay data for 62Zn represented by the energy, intensity, and decay …………………………………………………… 12... with focuses in cancer diagnosis/management, cardiac surgery, and neurology/psychiatry, respectively (Bailey et al., 2005). PET imaging is currently very powerful with the use of FDG, an effective and powerful radiopharmaceutical, but it also currently...
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.
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
System Modeling and Design Optimization for a Next-Generation Unattended Sensor
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.
Power Generation Loading Optimization using a Multi-Objective Constraint-Handling Method via
Li, Xiaodong
bottom line. Increased pressures from environmental regulations, rising fuel costs, and green house gas
Device and method for generating a beam of acoustic energy from a borehole, and applications thereof
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.
Constrained Multi-Objective Optimization Using Steady State Genetic Algorithms
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
Generator-absorber-heat exchange heat transfer apparatus and method and use thereof in a heat pump
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.
Krishnamoorthy, Sriram [ORNL; Bernholdt, David E [ORNL; Pitzer, R. M. [Ohio State University; Sadayappan, Ponnuswamy [ORNL
2009-01-01T23:59:59.000Z
Complex tensor contraction expressions arise in accurate electronic structure models in quantum chemistry, such as the coupled cluster method. This paper addresses two complementary aspects of performance optimization of such tensor contraction expressions. Transformations using algebraic properties of commutativity and associativity can be used to significantly decrease the number of arithmetic operations required for evaluation of these expressions. The identification of common subexpressions among a set of tensor contraction expressions can result in a reduction of the total number of operations required to evaluate the tensor contractions. The first part of the paper describes an effective algorithm for operation minimization with common subexpression identification and demonstrates its effectiveness on tensor contraction expressions for coupled cluster equations. The second part of the paper highlights the importance of data layout transformation in the optimization of tensor contraction computations on modern processors. A number of considerations, such as minimization of cache misses and utilization of multimedia vector instructions, are discussed. A library for efficient index permutation of multidimensional tensors is described, and experimental performance data is provided that demonstrates its effectiveness.
Hartono, Albert; Lu, Qingda; henretty, thomas; Krishnamoorthy, Sriram; zhang, huaijian; Baumgartner, Gerald; Bernholdt, David E.; Nooijen, Marcel; Pitzer, Russell M.; Ramanujam, J.; Sadayappan, Ponnuswamy
2009-11-12T23:59:59.000Z
Complex tensor contraction expressions arise in accurate electronic structure models in quantum chemistry, such as the coupled cluster method. This paper addresses two complementary aspects of performance optimization of such tensor contraction expressions. Transformations using algebraic properties of commutativity and associativity can be used to significantly decrease the number of arithmetic operations required for evaluation of these expressions. The identification of common subexpressions among a set of tensor contraction expressions can result in a reduction of the total number of operations required to evaluate the tensor contractions. The first part of the paper describes an effective algorithm for operation minimization with common subexpression identification and demonstrates its effectiveness on tensor contraction expressions for coupled cluster equations. The second part of the paper highlights the importance of data layout transformation in the optimization of tensor contraction computations on modern processors. A number of considerations such as minimization of cache misses and utilization of multimedia vector instructions are discussed. A library for efficient index permutation of multi-dimensional tensors is described and experimental performance data is provided that demonstrates its effectiveness.
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.
Concentration solar power optimization system and method of using the same
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.
Generator-absorber-heat exchange heat transfer apparatus and method and use thereof in a heat pump
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.
Generator-absorber-heat exchange heat transfer apparatus and method and use thereof in a heat pump
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.
Method and apparatus for steam mixing a nuclear fueled electricity generation system
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.
Method and apparatus for improving the performance of a nuclear power electrical generation system
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.
Analyzing of Balancing Authorities Cooperation Methods with High Variable Generation Penetration
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.
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.
Higher-Order Methods for Determining Optimal Controls and Their Sensitivities
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 ...
Multi-objective evolutionary methods for time-changing portfolio optimization problems
Hatzakis, Iason
2007-01-01T23:59:59.000Z
This thesis is focused on the discovery of efficient asset allocations with the use of evolutionary algorithms. The portfolio optimization problem is a multi-objective optimization problem for the conflicting criteria of ...
Isotone Optimization in R: Pool-Adjacent-Violators Algorithm (PAVA) and Active Set Methods
Leeuw, Jan de; Hornik, Kurt; Mair, Patrick
2009-01-01T23:59:59.000Z
Optimization in R: Pool-Adjacent-Violators Algorithm (PAVA)discuss a generalized version of the Pool-Adjacent-Violators
Isotone Optimization in R: Pool-Adjacent-Violators Algorithm (PAVA) and Active Set Methods
Jan de Leeuw; Kurt Hornik; Patrick Mair
2011-01-01T23:59:59.000Z
Optimization in R: Pool-Adjacent-Violators Algorithm (PAVA)discuss a generalized version of the Pool-Adjacent-Violators
[SIAM conference on optimization
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.
Magnetic filter apparatus and method for generating cold plasma in semicoductor processing
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.
Bias-Variance Techniques for Monte Carlo Optimization: Cross-validation for the CE Method
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 ...
System and method for generating a deselect mapping for a focal plane array
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.
Method of controlling temperature of a thermoelectric generator in an exhaust system
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.
Next Generation Nuclear Plant Methods Research and Development Technical Program Plan -- PLN-2498
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.
An analysis of pavement heat flux to optimize the1 water efficiency of a pavement-watering method2
Paris-Sud XI, Université 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
Lin, Guoping; Tillement, O; Cai, Zhiping; Lefčvre-Seguin, V; Hare, J
2015-01-01T23:59:59.000Z
A method based on thermal bistability for ultralow-threshold microlaser optimization is demonstrated. When sweeping the pump laser frequency across a pump resonance, the dynamic thermal bistability slows down the power variation. The resulting line shape modification enables a real-time monitoring of the laser characteristic. We demonstrate this method for a functionalized microsphere exhibiting a submicrowatt laser threshold. This approach is confirmed by comparing the results with a step-by-step recording in quasi-static thermal conditions.
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).
Design-by-Analogy Using the WordTree Method and an Automated WordTree Generating Tool
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...
Shlapentokh, Alexandra
Diophantine Generation, Horizontal and Vertical Problems, and the Weak Vertical Method Alexandra Shlapentokh Diophantine Sets, Definitions and Generation Diophantine Sets Diophantine Generation Properties of Diophantine Generation Diophantine Family of Z Diophantine Family of a Polynomial Ring Going Down Horizontal
Variable cooling circuit for thermoelectric generator and engine and method of control
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.
System and method for generating and/or screening potential metal-organic frameworks
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.
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.
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.
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.
Real-time Optimization Method for Optical Parameters of Ion Implanters
Ogata, Seiji [ULVAC, Inc., Research and Development Div., 2500 Hagizono Chigasaki Kanagawa 253-8543 (Japan); Nishihashi, Tsutomu; Tonari, Kazuhiko [ULVAC, Inc., Inst. Semiconductor Technology, 1220-1 Suyama Susono Shizuoka 410-1231 (Japan); Yokoo, Hidekazu; Suzuki, Hideo; Hisamune, Takeshi [ULVAC, Inc., Semiconductor Equipment Div. 2, 1220-14 Suyama Susono Shizuoka 410-1231 (Japan); Araki, Masasumi [ULVAC, Inc., Software Development Control Solution Div., Hagizono Chigasaki Kanagawa 253-8543 (Japan)
2006-11-13T23:59:59.000Z
Real-time optimization for optical parameters, such as applied voltage to the electrostatic quadrupole lens, has been realized by using newly developed high-speed computation algorithm for charged particle beams. The virtual optimization code has been incorporated in the control system of SOPHI-200, which is the ULVAC'S new medium current ion implanter. Automatic setup within 5minutes is achieved for any recipe of implantation.
Luh, Peter
and ancillary services are primarily traded through auctions in a daily market. GenCos submit hourly generation
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.
Generator-absorber-heat exchange heat transfer apparatus and method and use thereof in a heat pump
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.
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.
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
Camińa, 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 ...
Digital slip frequency generator and method for determining the desired slip frequency
Klein, Frederick F. (Monroeville, PA)
1989-01-01T23:59:59.000Z
The output frequency of an electric power generator is kept constant with variable rotor speed by automatic adjustment of the excitation slip frequency. The invention features a digital slip frequency generator which provides sine and cosine waveforms from a look-up table, which are combined with real and reactive power output of the power generator.
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.
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.
Method and apparatus for anti-islanding protection of distributed generations
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.
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
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
Stochastic optimization methods for extracting cosmological parameters from CMBR power spectra
Steen Hannestad
1999-11-17T23:59:59.000Z
The reconstruction of the CMBR power spectrum from a map represents a major computational challenge to which much effort has been applied. However, once the power spectrum has been recovered there still remains the problem of extracting cosmological parameters from it. Doing this involves optimizing a complicated function in a many dimensional parameter space. Therefore efficient algorithms are necessary in order to make this feasible. We have tested several different types of algorithms and found that the technique known as simulated annealing is very effective for this purpose. It is shown that simulated annealing is able to extract the correct cosmological parameters from a set of simulated power spectra, but even with such fast optimization algorithms, a substantial computational effort is needed.
Schlegel, H. Bernhard
with QM/MM methods II: Explicit quadratic coupling T. VREVEN*y, M. J. FRISCHy, K. N. KUDINz, H. B QM/MM systems is usually carried out by alternating a second-order optimization of the QM region using internal coordinates (`macro-iterations'), and a first-order optimization of the MM region using
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 ...
Optimization Online Digest -- February 2015
Computational Optimization of Gas Compressor Stations: MINLP Models vs. ... The Cyclic Block Conditional Gradient Method for Convex Optimization Problems
Paris-Sud XI, Université 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
Derivative-free optimization methods for surface structure determination of nanosystems
Meza, Juan C.; Garcia-Lekue, Arantzazu; Abramson, Mark A.; Dennis, John E.
2007-01-01T23:59:59.000Z
elec- tron diffraction ( LEED ) method, which uses a high-?the low energy electron diffraction ( LEED ) method [1, 2].LEED involves the use of an electron gun to bombard a sample
Device and method for generating a beam of acoustic energy from a borehole, and applications thereof
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.
Eriksson, J.
2004-01-01T23:59:59.000Z
A method, based on simulation models, for active functional tests and optimization of coil energy recovery loop systems in Air Handling Units (AHUs) have been developed and a first version implemented in the program Engineering Equation Solver (EES...
A Conformal Mapping Grid Generation Method for Modeling High-Fidelity Aeroelastic Simulations
Worley, Gregory
2010-07-14T23:59:59.000Z
This work presents a method for building a three-dimensional mesh from two- dimensional topologically identical layers, for use in aeroelastic simulations. The method allows modeling of large deformations of the wing in ...
A manual procedure for assembly sequence planning based on the exploded view method
Rivero, Andres R
1995-01-01T23:59:59.000Z
This thesis covers the development of a manual planning procedure based on the computerized method of exploded views to generate an optimal or near-optimal assembly sequence. Care has been taken to minimize iterative and tedious operations and make...
A manual procedure for assembly sequence planning based on the exploded view method
Rivero, Andres R
1995-01-01T23:59:59.000Z
This thesis covers the development of a manual planning procedure based on the computerized method of exploded views to generate an optimal or near-optimal assembly sequence. Care has been taken to minimize iterative and ...
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.
Wind turbine generators having wind assisted cooling systems and cooling methods
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.
Method and apparatus for enhanced heat recovery from steam generators and water heaters
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.
Krstic, Miroslav
) to provide ancillary services to autonomous electric microgrid systems (e.g. hospital backup power, military for Plug-In Microgrid Power Generation Automated Modeling Laboratory Slide 4 of 28 System Level Block POWER BUS Stack Current Stack Voltage Battery Power Power Output Powertrain System Model FCS model
System and method for determining an ammonia generation rate in a three-way catalyst
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.
Optimization Online - Convex and Nonsmooth Optimization ...
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
Comparison of heuristic methods for reliability optimization of series-parallel systems
Lee, Hsiang
2003-01-01T23:59:59.000Z
Three heuristics, the max-min approach, Nakagawa and Nakashima method, and Kim and Yum method, are considered for the redundancy allocation problem with series-parallel structures. The max-min approach can formulate the problem as an integer linear...
Optimized shooting method for finding periodic orbits of nonlinear dynamical systems
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.
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.
A Zonotope-Based Method for Capturing the Effect of Variable Generation on the Power Flow
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
Optimization Online - Stochastic Topology Design Optimization for ...
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.
Integrated method to create optimal dynamic strategic plans for corporate technology start-ups
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 ...
A non-linear constrained optimization technique for the mimetic finite difference method
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.
A Stochastic Quasi-Newton Method for Large-Scale Optimization
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.
Fuzzy logic controller optimization
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.
Optimal design of asynchronous circuits
Cox, Berry Tod
1991-01-01T23:59:59.000Z
C4 X X Fig. 10. Covering Table for Illustration Purposes of-products form. These laws are: a(6+ c) = ab+ ac (a+ b)(a+ c) = a+ bc Each product obtained by reducing 4. 2 is a valid USTT state assignment. To illustrate Petrick's method, consider...-Optimal State Assignment Procedure B. The Tracey Method 14 17 IV OPTIMAL DESIGN OF USTT ASYNCHRONOUS CIRCUITS 21 A. Valid State Assignments B. Determination of the Primitive Dichotomies C. Generation of Covering Dichotomies. . . D. Covering the Primitive...
Lee, Jooyoung
of conformations to determine the minimum energy structure. We combine these methods by using conformations thermal kinetic energy, they will be able to overcome barriers, escape local minima, and explore the free Annealing Method Asim Okur,*, Benjamin T. Miller, Keehyoung Joo, Jooyoung Lee, and Bernard R. Brooks
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.
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...
System and method for generating steady state confining current for a toroidal plasma fusion reactor
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.
System and method for generating steady state confining current for a toroidal plasma fusion reactor
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.
Resonantly enhanced method for generation of tunable, coherent vacuum-ultraviolet radiation
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.
Resonantly enhanced method for generation of tunable, coherent vacuum ultraviolet radiation
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.
Method and apparatus for optimizing the efficiency and quality of laser material processing
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.
Method and apparatus for optimizing the efficiency and quality of laser material processing
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.
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)
A DYNAMIC CRASHING METHOD FOR PROJECT MANAGEMENT USING SIMULATION-BASED OPTIMIZATION
Kuhl, Michael E.
. The crashing method is focused on reducing the time of the activities on the critical path. The critical path of the critical path, ignoring the uncer- tainty related with the duration of the activities. Conse- quently, other paths that may have a high probability of becoming critical are ignored. As a way to overcome
Method of optimizing performance of Rankine cycle power plants. [US DOE Patent
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.
Successive Backward Sweep Methods for Optimal Control of Nonlinear Systems with Constraints
Cho, Donghyurn
2013-08-13T23:59:59.000Z
with impulsive control ................... 90 5. THE SBS METHOD AUGMENTED WITH A HOMOTOPY ALGORITHM . 93 5.1 Numerical examples ............................................................................. 98 5.1.1 Example 5-1: A simple two point... .......................................................................................... vi LIST OF FIGURES ................................................................................................... ix LIST OF TABLES .................................................................................................... xvi 1...
Almost Optimal Convergence of the Point Vortex Method for Vortex Sheets using Numerical Filtering
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
Optimization of Jatropha Oil Extraction and Its By-Product Utilization by Pyrolysis Method
Kongkasawan, Jinjuta 1987-
2012-08-20T23:59:59.000Z
crisis. The purpose of this research is to investigate the optimum condition of Jatropha seed extraction via a screw press and its by-product utilization by a pyrolysis method for achieving the maximum mass conversion and energy recovery. In this study...
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.
Generation of pseudostates for the Dirac-Coulomb Hamiltonian using the variational method
Kim, Yong-Dal
1989-01-01T23:59:59.000Z
Set. . . 22 25 26 33 IV A NEK BASIS SET FOR THE DIRAC-COULOMB HAMILTONIAN 45 4. 1 The Generat(on of the New Basis Set 4. 2 Construction of Matr(ces S and H 4. 3 The Solution f' or the New Basis Set 45 47 50 V CONCLUSION . REFERENCES 70... special, are used. . . . . . . . . . . . 4. 3 Energy dependence on parameter f for Ps/&-state (&; = 2) and Z = 92, when ten basis functsons, without any special, are used. . . . . . . . . . . . 4. 4 Energy dependence on parameter f for Ds/r state (r...
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.
Method and system for generating a beam of acoustic energy from a borehole, and applications thereof
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.
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.
Method and apparatus for generating motor current spectra to enhance motor system fault detection
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.
Method and apparatus for generating motor current spectra to enhance motor system fault detection
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.
Blacker, Teddy D. (12205 Kashmir, N.E., Albuquerque, NM 87111)
1994-01-01T23:59:59.000Z
An automatic quadrilateral surface discretization method and apparatus is provided for automatically discretizing a geometric region without decomposing the region. The automated quadrilateral surface discretization method and apparatus automatically generates a mesh of all quadrilateral elements which is particularly useful in finite element analysis. The generated mesh of all quadrilateral elements is boundary sensitive, orientation insensitive and has few irregular nodes on the boundary. A permanent boundary of the geometric region is input and rows are iteratively layered toward the interior of the geometric region. Also, an exterior permanent boundary and an interior permanent boundary for a geometric region may be input and the rows are iteratively layered inward from the exterior boundary in a first counter clockwise direction while the rows are iteratively layered from the interior permanent boundary toward the exterior of the region in a second clockwise direction. As a result, a high quality mesh for an arbitrary geometry may be generated with a technique that is robust and fast for complex geometric regions and extreme mesh gradations.
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...
Contacts to WTE operators in Austria using the Balance-Method to label the electricity generated
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
Contacts to WTE operators in Austria using the Balance-Method to label the electricity generated
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
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.
Connectivity-based, all-hexahedral mesh generation method and apparatus
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.
Optimization Online - Stochastic Programming Submissions - 2013
Stochastic Programming Submissions - 2013. January 2013. Generating moment matching scenarios using optimization techniques. Sanjay Mehrotra, David ...
System and method for generating current by selective minority species heating
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.
Optimization Online Digest -- March 2015
Real-Time Dispatchability of Bulk Power Systems with Volatile Renewable Generations ... Optimization of Multiple Receivers Solar Power Tower systems
Wagner, A.; Wambsgan, M.; Froehlich, S.
2004-01-01T23:59:59.000Z
of Architecture Building Physics and Technical Building Services Geb?udedaten Fl?chenArbeitspl?tze Z?hlerdaten Z?hlernummerBezeichnungMengeneinheitZ?hlerortUmrechnungsfaktoren Z?hlerst?nde Original-Z?hlerst?nde aller er-fassten Z?hler im Geb?udezum Ablesetermin... Verbr?uche Verbr?uche aller Z?hler f?r denAblesezeitraum G Geb?udedaten Fl?chenArbeitspl?tze Z?hlerdaten Z?hlernummerBezeichnungMengeneinheitZ?hlerortUmrechnungsfaktoren Z?hlerst?nde Original-Z?hlerst?nde aller er-fassten Z?hler im Geb...
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.
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
Method for generating small and ultra small apertures, slits, nozzles and orifices
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.
Apparatus and method for generating a magnetic field by rotation of a charge holding object
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.
Ness, E.
1999-09-02T23:59:59.000Z
Distributed generation, locating electricity generators close to the point of consumption, provides some unique benefits to power companies and customers that are not available from centralized electricity generation. Photovoltaic (PV) technology is well suited to distributed applications and can, especially in concert with other distributed resources, provide a very close match to the customer demand for electricity, at a significantly lower cost than the alternatives. In addition to augmenting power from central-station generating plants, incorporating PV systems enables electric utilities to optimize the utilization of existing transmission and distribution.
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.
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.
EZPIX: a tablet entry method for computer-generated slides, drawings, and graphs
Williams, J.M.
1984-09-01T23:59:59.000Z
This manual outlines a method for making slides, drawings, maps, graphs, etc., with the touch of a button. A minicomputer-based program, called EZPIX, connects the host computer graphics system to a tablet on which one can digitize input and specify graphics commands from a menu. A minicomputer terminal serves as editor and provides local graphics output. The magic button does practically everything else. It signs you on, starts, builds, ends, executes and saves your command file, and signs you off. It even allows you to make a composite picture from an assortment of inappropriately sized originals. The graph and pie chart modes are handy, too.
Method and apparatus for the simultaneous display and correlation of independently generated images
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.
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.
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.
A new method of RF power generation for two-beam linear colliders
Braun, H; D'Amico, T E; Delahaye, J P; Guignard, Gilbert; Johnson, C; Millich, Antonio; Pearce, P; Rinolfi, Louis; Riche, A J; Schulte, Daniel; Thorndahl, L; Valentini, M; Wilson, Ian H; Ruth, Ronald D
1998-01-01T23:59:59.000Z
In this paper we discuss a new approach to two-beam acceleration. The energy for RF production is initially stored in a long-pulse electron beam which is efficiently accelerated to about 1.2 GeV by a fully loaded, conventional, low frequency (~1 GHz) linac. The beam pulse length is twice the length of the high-gradient linac. Segments of this long pulse beam are compressed using combiner rings to create a sequence of higher peak power drive beams with gaps in between. This train of drive beams is distributed from the end of the linac against the main beam direction down a common transport line so that each drive beam can power a section of the main linac. After a 180-degree turn, each high-current, low-energy drive beam is decelerated in low-impedance decelerator structures, and the resulti ng power is used to accelerate the low-current, high-energy beam in the main linac. The method discussed here seems relatively inexpensive is very flexible and can be used to accelerate beams for lin ear colliders over the...
Optimization Online Digest -- May 2011
An Accelerated Hybrid Proximal Extragradient Method for Convex ... Optimization and homotopy methods for the Gibbs free energy of magmatic mixtures
Empirical comparison of robust, data driven and stochastic optimization
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 ...
Cleanroom Energy Optimization Methods
Naughton, P.; Schrecengost, R.
2004-01-01T23:59:59.000Z
The design and operation of semiconductor cleanrooms play an important role in the advancement of many of today's technology needs as the use of microelectronic products become engrained in our society. Cleanroom construction has averaged double...
Cleanroom Energy Optimization Methods
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...
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.
Burin des Roziers, T.
2011-01-01T23:59:59.000Z
variables formula -&i [gJx)] -$IEpo [gi(x(t))] I&o [Vgi(x(t)) Epf [Vgi(x) . F(x(t))] . F(x)]. If the assumption thatthat $~e[,) [g;(x)] N ~e(,) [Vgi(x) “F(x)]. But %,[,) [gi(
NPIP: A skew line needle configuration optimization system for HDR brachytherapy
Goldberg, Ken
NPIP: A skew line needle configuration optimization system for HDR brachytherapy Timmy Siauwa) brachytherapy and needle planning by integer program (NPIP), a computational method for generat- ing needles than the current HDR brachytherapy workflow. Combined with robot assisted brachytherapy
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.
Strauss, Charlie E. (Santa Fe, NM)
1997-01-01T23:59:59.000Z
Apparatus and method for heterodyne-generated, two-dimensional detector array using a single detector. Synthetic-array heterodyne detection, permits a single-element optical detector to behave as though it were divided into an array of separate heterodyne detector elements. A fifteen-element synthetic array has successfully been experimentally realized on a single-element detector, permitting all of the array elements to be read out continuously and in parallel from one electrical connection. A CO.sub.2 laser and a single-element HgCdTe photodiode are employed. A different heterodyne local oscillator frequency is incident upon the spatially resolvable regions of the detector surface. Thus, different regions are mapped to different heterodyne beat frequencies. One can determine where the photons were incident on the detector surface even though a single electrical connection to the detector is used. This also prevents the destructive interference that occurs when multiple speckles are imaged (similar to spatial diversity), In coherent LIDAR this permits a larger field of view. An acoustooptic modulator generates the local oscillator frequencies and can achieve adequate spatial separation of optical frequencies of the order of a megahertz apart.
Strauss, 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.
Apparatus and method for generating continuous wave 16 .mu.m laser radiation using gaseous CF.sub.4
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.
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.
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 ...
A COLUMN GENERATION APPROACH FOR GRAPH COLORING
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
Optimization Online Digest -- February 2011
Stochastic Optimization for Power System Configuration with Renewable Energy in ... A stabilized model and an efficient solution method for the yearly optimal ...
Optimization Online - Probabilistic optimization via approximate p ...
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 )
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.
Modeling & Optimization An ABB Speciality
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
Optimization Online - Multimaterial topology optimization by volume ...
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.
Johansen, Tor Arne
been given in [10] whereas optimal load sharing for equal and unequal sized diesel generators has been1 Optimization of Load Dependent Start Tables in Marine Power Management Systems with Blackout and minimization of fuel consumption. Proposed method serves as an aid in a design of power management system
Object-oriented Dynamics Modeling for Legged Robot Trajectory Optimization and Control
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
Optimization Online - All Areas Submissions - March 2015
Real-Time Dispatchability of Bulk Power Systems with Volatile Renewable Generations ... Optimization of Multiple Receivers Solar Power Tower systems
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...
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 ...
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...
Zhu, Ling; Long, R. J.; Mao, Shude [National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Rd, Chaoyang District, Beijing 100012 (China); Peng, Eric W.; Li, Biao [Department of Astronomy, Peking University, Beijing 100871 (China); Liu, Chengze [Department of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240 (China); Caldwell, Nelson [Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138 (United States); Blakeslee, John P.; Côté, Patrick; Ferrarese, Laura; Gwyn, Stephen [National Research Council of Canada, Victoria, BC V9E 2E7 (Canada); Cuillandre, Jean-Charles [Canada-France-Hawaii Telescope Corporation, Kamuela, HI 96743 (United States); Durrell, Patrick [Department of Physics and Astronomy, Youngstown State University, One University Plaza, Youngstown, OH 44555 (United States); Emsellem, Eric [Université de Lyon 1, CRAL, Observatoire de Lyon, 9 av. Charles André, F-69230 Saint-Genis Laval, CNRS, UMR 5574, ENS de Lyon (France); Jordán, Andrés; Muńoz, Roberto; Puzia, Thomas [Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Av. Vicuńa Mackenna 4860, 7820436 Macul, Santiago (Chile); Lançon, Ariane [Observatoire astronomique de Strasbourg, Université de Strasbourg, CNRS, UMR 7550, 11 rue de l'Universite, F-67000 Strasbourg (France); Mei, Simona, E-mail: lzhu@mpia-hd.mpg.de [GEPI, Observatoire de Paris, 77 av. Denfert Rochereau, F-75014 Paris (France)
2014-09-01T23:59:59.000Z
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 catalog 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. There are 263 globular clusters, mainly located beyond 40 kpc, newly observed by the Next Generation Virgo Survey. For the M2M modeling, 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 modeled as a logarithmic potential. Our best-fit dynamical model returns a stellar mass-to-light ratio in the I band of M/L{sub I} = 6.0 ± 0.3 M{sub ?} L{sub ?}{sup ?1} with a dark matter potential scale velocity of 591 ± 50 km s{sup –1} and scale radius of 42 ± 10 kpc. We determine the total mass of M87 within 180 kpc to be (1.5 ± 0.2) × 10{sup 13} M {sub ?}. The mass within 40 kpc is smaller than previous estimates determined using globular cluster kinematics that did not extend beyond ?45 kpc. With our new globular cluster velocities at much larger radii, we see that globular clusters around 40 kpc show an anomalously large velocity dispersion which affected previous results. The mass we derive is in good agreement with that inferred from ROSAT X-ray observation out to 180 kpc. Within 30 kpc our mass is also consistent with that inferred from Chandra and XMM-Newton X-ray observations, while within 120 kpc it is about 20% smaller. The model velocity dispersion anisotropy ? parameter for the globular clusters in M87 is small, varying from –0.2 at the center to 0.2 at ?40 kpc, and gradually decreasing to zero at ?120 kpc.
Kumar, Ratnesh
for electric transmission systems to endow them with the capability of being reconfigured to a secure of the electric transmission system. There are three basic options for strengthening transmission systems: (1) build new transmission lines, (2) build new generation at strategic locations, and (3) introduce
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.
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
Crew Pairing Optimization with Genetic Harry Kornilakis and Panagiotis Stamatopoulos
Panagiotis, Stamatopoulos
- tions. The purpose of the crew pairing problem is to generate a set of pairings with minimal cost with near optimal cost. This problem, which is modelled by a set covering formulation, is solved with a genetic algorithm. The presented method was tested on actual flight data of Olympic Airways. 1
Optimization Online - Semidefinite optimization, a spectral approach
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.
Performance of First- and Second-Order Methods for Big Data ...
Kimon Fountoulakis
2015-03-11T23:59:59.000Z
Mar 11, 2015 ... Performance of First- and Second-Order Methods for Big Data Optimization ... The generator has very low memory requirements and scales well with the dimensions of the problem. ... Visitors, Authors, More about us, Links.
Gorissen, Bram L
2015-01-01T23:59:59.000Z
Comparison of optimization algorithms for inverse treatment planning requires objective function value evaluation.
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.
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.
Optimization Online - All Areas Submissions - February 2011
Stochastic Optimization for Power System Configuration with Renewable Energy in ... A stabilized model and an efficient solution method for the yearly optimal ...
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.
Ordóńez, 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
Berglof, K.
2010-01-01T23:59:59.000Z
systems 10% can be saved in average at minimal cost if actual performance is documented. Experience exists from all types of systems and the method has become accepted by hundreds of leading companies in most European countries. The European Union has...
Optimization Journals, Sites, Societies - Optimization Online
Optimization related societies. Mathematical Optimization Society · SIAM · INFORMS. Optimization related journals. Mathematical Programming and ...
Integer optimization in data mining
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 ...
Global optimization in reduced space
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 ...
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...
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...
Optimizing SRF Gun Cavity Profiles in a Genetic Algorithm Framework
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.
Paris-Sud XI, Université 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
Robin, A.M.; Kassman, J.S.; Leininger, T.F.; Wolfenbarger, J.K.; Wu, C.M.; Yang, P.P.
1991-09-01T23:59:59.000Z
This second Topical Report describes the work that was completed between January 1, 1989 and December 31, 1990 in a Cooperative Agreement between Texaco and the US Department of Energy that began on September 30, 1987. During the period that is covered in this report, the development and optimization of in-situ and external desulfurization processes were pursued. The research effort included bench scale testing, PDU scoping tests, process economic studies and advanced instrument testing. Two bench scale studies were performed at the Research Triangle Institute with zinc titanate sorbent to obtain data on its cycle life, sulfur capacity, durability and the effect of chlorides. These studies quantify sulfur capture during simulated air and oxygen-blown gasification for two zinc titanate formulations. Eight PDU runs for a total of 20 days of operation were conducted to evaluate the performance of candidate sorbents for both in-situ and external desulfurization. A total of 47 tests were completed with oxygen and air-blown gasification. Candidate sorbents included iron oxide for in-situ desulfurization and calcium based and mixed metal oxides for external desulfurization. Gasifier performance and sorbent sulfur capture are compared for both air-blown and oxygen-blown operation.
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:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports(Journal Article) |govInstrumentsmfrirtA Journey Inside the Complex andFOUR Los AlamosMedicalStart Here VolumeMethods for Analyzing the
Optimal control with adaptive internal dynamics models
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 ...
Polyethylene fiber drawing optimization
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 ...
Optimization Online - Global Optimization of Non-Linear Systems of ...
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, ...
Optimization Online Digest -- May 2014
Relay Optimization Method Xuyan Wang Dynamic vs. ... A mixed integer programming approach for asset protection during escaped wildfires. Martijn Van der ...
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.
Convex and Nonsmooth Optimization Submissions - 2012. January 2012. Nonsmooth Optimization Necessary optimality conditions in pessimistic bilevel ...
Optimization related societies. Mathematical Optimization Society · SIAM · INFORMS. Optimization related journals. Mathematical Programming and ...
NUMERICAL OPTIMIZATION METHODS FOR BLIND ...
2012-02-11T23:59:59.000Z
molecular structure determination, International Journal of High Performance Computing. Applications, 24 (2010), pp. 117–135. [10] J. Frank, Three-
Projection methods in conic optimization
2011-03-08T23:59:59.000Z
us to reformulate the problem as a projection onto the intersection of an affine ...... Journal of the American Statistical Association, 78:837–842, 1983. 33 ...
Optimization Online - All Areas Submissions - May 2014
Relay Optimization Method Xuyan Wang. Applications ... A mixed integer programming approach for asset protection during escaped wildfires. Martijn Van der ...
Chopped random-basis quantum optimization
Tommaso Caneva; Tommaso Calarco; Simone Montangero
2011-08-22T23:59:59.000Z
In this work we describe in detail the "Chopped RAndom Basis" (CRAB) optimal control technique recently introduced to optimize t-DMRG simulations [arXiv:1003.3750]. Here we study the efficiency of this control technique in optimizing different quantum processes and we show that in the considered cases we obtain results equivalent to those obtained via different optimal control methods while using less resources. We propose the CRAB optimization as a general and versatile optimal control technique.
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.
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.
Optimal operation of large-scale power systems
Lee, K.Y.; Ortiz, J.L.; Mohtadi, M.A.; Park, Y.M.
1988-05-01T23:59:59.000Z
This paper presents a method for an optimal operation of large-scale power systems similar to the one utilized by the Houston Lighting and Power Company. The main objective is to minimize the system fuel costs, and maintain an acceptable system performance in terms of limits on generator real and reactive power outputs, transformer tap settings, and bus voltage levels. Minimizing the fuel costs of such large-scale systems enhances the performance of optimal real power generator allocation and of optimal power flow that results in an economic dispatch. The gradient projection method (GPM) is utilized in solving the optimization problems. It is an iterative numerical procedure for finding an extremum of a function of several variables that are required to satisfy various constraining relations without using penalty functions or Lagrange multipliers among other advantages. Mathematical models are developed to represent the sensitivity relationships between dependent and control variables for both real- and reactive-power optimization procedures; and thus eliminate the use of B-coefficients. Data provided by the Houston lighting and Power Company are used to demonstrate the effectiveness of the proposed procedures.
Assessment of Distributed Generation Potential in JapaneseBuildings
Zhou, Nan; Marnay, Chris; Firestone, Ryan; Gao, Weijun; Nishida,Masaru
2005-05-25T23:59:59.000Z
To meet growing energy demands, energy efficiency, renewable energy, and on-site generation coupled with effective utilization of exhaust heat will all be required. Additional benefit can be achieved by integrating these distributed technologies into distributed energy resource (DER) systems (or microgrids). This research investigates a method of choosing economically optimal DER, expanding on prior studies at the Berkeley Lab using the DER design optimization program, the Distributed Energy Resources Customer Adoption Model (DER-CAM). DER-CAM finds the optimal combination of installed equipment from available DER technologies, given prevailing utility tariffs, site electrical and thermal loads, and a menu of available equipment. It provides a global optimization, albeit idealized, that shows how the site energy loads can be served at minimum cost by selection and operation of on-site generation, heat recovery, and cooling. Five prototype Japanese commercial buildings are examined and DER-CAM applied to select the economically optimal DER system for each. The five building types are office, hospital, hotel, retail, and sports facility. Based on the optimization results, energy and emission reductions are evaluated. Furthermore, a Japan-U.S. comparison study of policy, technology, and utility tariffs relevant to DER installation is presented. Significant decreases in fuel consumption, carbon emissions, and energy costs were seen in the DER-CAM results. Savings were most noticeable in the sports facility (a very favourable CHP site), followed by the hospital, hotel, and office building.
Enumerating a Diverse Set of Building Designs Using Discrete Optimization: Preprint
Hale, E.; Long, N.
2010-08-01T23:59:59.000Z
Numerical optimization is a powerful method for identifying energy-efficient building designs. Automating the search process facilitates the evaluation of many more options than is possible with one-off parametric simulation runs. However, input data uncertainties and qualitative aspects of building design work against standard optimization formulations that return a single, so-called optimal design. This paper presents a method for harnessing a discrete optimization algorithm to obtain significantly different, economically viable building designs that satisfy an energy efficiency goal. The method is demonstrated using NREL's first-generation building analysis platform, Opt- E-Plus, and two example problems. We discuss the information content of the results, and the computational effort required by the algorithm.
Smart Grid Application of Optimal Transmission Switching
Ferris, Michael C.
;6 Introduction continued Electric Transmission Network Flow Problem Optimal Power Flow (OPF) AlternatingSmart Grid Application of Optimal Transmission Switching By, Kory W. Hedman, et al.* University (Professor, UC Berkeley) #12;2 Motivation Co-optimize transmission topology and generation dispatch
Optimization Online - Nonlinear Optimization Submissions - 2014
Nonlinear Optimization Submissions - 2014. January 2014. Constrained Nonlinear Optimization New active set identification for general constrained ...
July 2, 2007 1 Optimal Transmission Switching
Mangasarian, Olvi L.
Terms--Integer programming, Power generation dispatch, Power system economics, Power transmissionJuly 2, 2007 1 Optimal Transmission Switching Emily Bartholomew Fisher, Student Member, IEEE an optimal generation dispatch and transmission topology to meet a specific inflexible load as a mixed
Optimal Power Dispatch via Multistage Stochastic Programming
RĂ¶misch, Werner
Mathematical models for cost-optimal power scheduling in hydro-thermal systems often combine several di culties for the dis- patch of electric power in a hydro-thermal generation system over a certain time horizon. The short-term cost-optimal dispatch of electric power in a generation sys- tem under uncertain electricity
Strong Equivalence of Qualitative Optimization Problems
Faber, Wolfgang; Woltran, Stefan
2011-01-01T23:59:59.000Z
We introduce the framework of qualitative optimization problems (or, simply, optimization problems) to represent preference theories. The formalism uses separate modules to describe the space of outcomes to be compared (the generator) and the preferences on outcomes (the selector). We consider two types of optimization problems. They differ in the way the generator, which we model by a propositional theory, is interpreted: by the standard propositional logic semantics, and by the equilibrium-model (answer-set) semantics. Under the latter interpretation of generators, optimization problems directly generalize answer-set optimization programs proposed previously. We study strong equivalence of optimization problems, which guarantees their interchangeability within any larger context. We characterize several versions of strong equivalence obtained by restricting the class of optimization problems that can be used as extensions and establish the complexity of associated reasoning tasks. Understanding strong equiv...
Board Package On-Chip Automated di/dt Stressmark Generation for
John, Lizy Kurian
-- In this paper, we propose a method for automated di/dt stressmark generation to test maximum voltage droop and low current pulses that maximize voltage fluctuations including voltage droops. In order to automate and optimizing candidate instruction sequences to create a maximum voltage droop. The results show that our
PĂˇzsit, Imre
2006-01-01T23:59:59.000Z
of neutrons and gamma photons generated in a multiplying sample Andreas Enqvista,Ă?, Imre PaÂ´ zsita , Sara is an analytical derivation of the full probability distribution of the number of neutrons and photons generated. With the introduction of a modified factorial moment of the number of neutrons and gamma photons generated in fission
Jrgen Bauck Jensen Optimal Operation of Refrigera-
Skogestad, Sigurd
and compared with the Tmin-method. Considering the large amount of work that goes into the design of LNG LNG process is used as an example for optimal design and optimal operation of LNG processes
Cost-Optimal Operation of Energy Storage Units: Benefits of a Problem-Specific Approach
Siemer, Lars; Kleinhans, David
2015-01-01T23:59:59.000Z
The integration of large shares of electricity produced by non-dispatchable Renewable Energy Sources (RES) leads to an increasingly volatile energy generation side, with temporary local overproduction. The application of energy storage units has the potential to use this excess electricity from RES efficiently and to prevent curtailment. The objective of this work is to calculate cost-optimal charging strategies for energy storage units used as buffers. For this purpose, a new mathematical optimization method is presented that is applicable to general storage-related problems. Due to a tremendous gain in efficiency of this method compared with standard solvers and proven optimality, calculations of complex problems as well as a high-resolution sensitivity analysis of multiple system combinations are feasible within a very short time. As an example technology, Power-to-Heat converters used in combination with thermal storage units are investigated in detail and optimal system configurations, including storage ...
Optimal Airflow Control for Laboratory Air Handling Unit (LAHU) Systems
Cui, Y.; Liu, M.; Conger, K.
2002-01-01T23:59:59.000Z
An optimal airflow control method and procedure have been developed for laboratory air handing unit (LAHU) systems using linear optimization theories. The optimal airflow control minimizes the thermal energy consumption and the cost, and improves...
Optimal Airflow Control for Laboratory Air Handling Unit (LAHU) Systems
Cui, Y.; Liu, M.; Conger, K.
2002-01-01T23:59:59.000Z
An optimal airflow control method and procedure have been developed for laboratory air handing unit (LAHU) systems using linear optimization theories. The optimal airflow control minimizes the thermal energy consumption and the cost, and improves...
Optimization of Heat Exchangers
Ivan Catton
2010-10-01T23:59:59.000Z
The objective of this research is to develop tools to design and optimize heat exchangers (HE) and compact heat exchangers (CHE) for intermediate loop heat transport systems found in the very high temperature reator (VHTR) and other Generation IV designs by addressing heat transfer surface augmentation and conjugate modeling. To optimize heat exchanger, a fast running model must be created that will allow for multiple designs to be compared quickly. To model a heat exchanger, volume averaging theory, VAT, is used. VAT allows for the conservation of mass, momentum and energy to be solved for point by point in a 3 dimensional computer model of a heat exchanger. The end product of this project is a computer code that can predict an optimal configuration for a heat exchanger given only a few constraints (input fluids, size, cost, etc.). As VAT computer code can be used to model characteristics )pumping power, temperatures, and cost) of heat exchangers more quickly than traditional CFD or experiment, optimization of every geometric parameter simultaneously can be made. Using design of experiment, DOE and genetric algorithms, GE, to optimize the results of the computer code will improve heat exchanger disign.
Harrison, Gareth
specifica- tions (e.g., thermal limits on transmission lines and transform- ers). Here, fault level capacity, which takes into ac- count fault level constraints imposed by protection equipment the estimation of fault currents. An iterative process allocates new capacity using Optimal Power Flow mechanisms
Zabaras, Nicholas J.
: Efficiency/Scalability: Features: Optimized templated versions of core statistical models Data-based input: Data-driven Stochastic Input Models: Enables to integrate experimental data and underlying physics in graphs Data-Driven Stochastic Input Models . Integration of Multiscale Models with Stochastic Analysis
Stochastic Generator of Chemical Structure. 3. Reaction Network Generation
FAULON,JEAN-LOUP; SAULT,ALLEN G.
2000-07-15T23:59:59.000Z
A new method to generate chemical reaction network is proposed. The particularity of the method is that network generation and mechanism reduction are performed simultaneously using sampling techniques. Our method is tested for hydrocarbon thermal cracking. Results and theoretical arguments demonstrate that our method scales in polynomial time while other deterministic network generator scale in exponential time. This finding offers the possibility to investigate complex reacting systems such as those studied in petroleum refining and combustion.
Zhang, Z.; Turner, W. D.; Chen, Q.; Xu, C.; Deng, S.
2010-01-01T23:59:59.000Z
to the original system configuration have to be made. In the preliminary study phase, the available information is limited, but the derterminzation of an optimal tank size as well as the energy and cost savings estimation will be critical for decision... on limited information and assumptions. It should be performed within a reasonable time, while yield accurate and reliable results. An in-depth literature search and study shows that the studies on ChW storage systems are mainly concentrated on field...
Fuel cell generator energy dissipator
Veyo, Stephen Emery (Murrysville, PA); Dederer, Jeffrey Todd (Valencia, PA); Gordon, John Thomas (Ambridge, PA); Shockling, Larry Anthony (Pittsburgh, PA)
2000-01-01T23:59:59.000Z
An apparatus and method are disclosed for eliminating the chemical energy of fuel remaining in a fuel cell generator when the electrical power output of the fuel cell generator is terminated. During a generator shut down condition, electrically resistive elements are automatically connected across the fuel cell generator terminals in order to draw current, thereby depleting the fuel
An Application of Integrated Thermal and Electrical Energy Cogeneration Optimization
Ahner, D. J.; Mills, R. J.
1994-01-01T23:59:59.000Z
The savings associated with operations optimization of power generation and cogeneration facilities are large, and readily justify the hardware and software costs required for implementation of Energy Management Optimization Systems (EMOS...
Geometric numerical integration of nonholonomic systems and optimal control problems
M. de Leon; D. Martin de Diego; A. Santamaria Merino
2002-12-02T23:59:59.000Z
A geometric derivation of numerical integrators for nonholonomic systems and optimal control problems is obtained. It is based in the classical technique of generating functions adapted to the special features of nonholonomic systems and optimal control problems.
Optimization Online - Nonlinear Optimization Submissions - 2013
Nonlinear Optimization Submissions - 2013. January 2013. A Framework of Constraint Preserving Update Schemes for Optimization on Stiefel Manifold
Optimization Online - Nonlinear Optimization Submissions - 2012
Nonlinear Optimization Submissions - 2012. January 2012. Systems governed by Differential Equations Optimization Squeeze-and-Breathe Evolutionary Monte ...
Optimization Online - Nonlinear Optimization Submissions - 2012
Sonia Cafieri, Alberto Costa, Pierre Hansen. February 2012. Unconstrained Optimization Smoothing SQP Algorithm for Non-Lipschitz Optimization with ...
Convex and Nonsmooth Optimization Submissions - 2014. January 2014. Convex Optimization Generalized Gauss Inequalities via Semidefinite Programming
Optimization as an Internet Resource
2000-08-17T23:59:59.000Z
specialized to many different mathematical problem types, and modeling systems ..... To use iMW for a particular optimization method applied to a particular problem, ..... puting applications,” Department of Electrical and Computer Engineering, ...
Distributed Optimization System
Hurtado, John E. (Albuquerque, NM); Dohrmann, Clark R. (Albuquerque, NM); Robinett, III, Rush D. (Tijeras, NM)
2004-11-30T23:59:59.000Z
A search system and method for controlling multiple agents to optimize an objective using distributed sensing and cooperative control. The search agent can be one or more physical agents, such as a robot, and can be software agents for searching cyberspace. The objective can be: chemical sources, temperature sources, radiation sources, light sources, evaders, trespassers, explosive sources, time dependent sources, time independent sources, function surfaces, maximization points, minimization points, and optimal control of a system such as a communication system, an economy, a crane, and a multi-processor computer.
Venkatasubramanian, Mani V.
. This is especially true for synchronous machines and their controls such as exciters, governors and limiters. In many, the estimation and periodic verification of the synchronous machine parameters and control parameters. Index Terms--Parameter estimation, synchronous generator model, simulation optimization method. I
Zhang, Z.; Turner, W. D.; Chen, Q.; Xu, C.; Deng, S.
2010-01-01T23:59:59.000Z
, the baseline profiles of electricity fed to buildings, plant cooling load, and utility billing cost for each plant are generated. A simplified TES plus four plants model is built based on some assumptions. The results show that a 3.5 million gallon tank has...
Efficiency optimization of an electrodynamic MEMS microspeaker
Paris-Sud XI, Université de
Efficiency optimization of an electrodynamic MEMS microspeaker I. Shahosseinia , E. Lefeuvrea , J to maximize the electroacoustic conversion efficiency. The optimization method takes into account that the efficiency of optimized MEMS microspeaker could be up to ten times greater than that of conventional