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1

Negative selection algorithms without generating detectors  

Science Conference Proceedings (OSTI)

Negative selection algorithms are immune-inspired classifiers that are trained on negative examples only. Classification is performed by generating detectors that match none of the negative examples, and these detectors are then matched against ... Keywords: artificial immune systems, consistent learning, negative selection

Maciej Li?kiewicz; Johannes Textor

2010-07-01T23:59:59.000Z

2

Graph mining: Laws, generators, and algorithms  

Science Conference Proceedings (OSTI)

How does the Web look? How could we tell an abnormal social network from a normal one? These and similar questions are important in many fields where the data can intuitively be cast as a graph; examples range from computer networks to sociology to biology ... Keywords: Generators, graphs, patterns, social networks

Deepayan Chakrabarti; Christos Faloutsos

2006-06-01T23:59:59.000Z

3

Steam Generator Management Program: Evaluation of Steam Generator Eddy Current Analysis Algorithms  

Science Conference Proceedings (OSTI)

As part of the U.S. Nuclear Regulatory Commissions (NRCs) International Steam Generator Tube Integrity Program, Argonne National Laboratory (ANL) evaluated algorithms for computer-aided analysis of rotating probe eddy current data. The algorithms were designed for both flaw detection and flaw sizing. Rotating probe data collected on the flawed tubes in the NRCs steam generator (SG) mockup were used to document performance of the algorithms for both detection and sizing. In the NRC program, the results of...

2011-06-30T23:59:59.000Z

4

Selection Intensity in Genetic Algorithms with Generation Gaps  

SciTech Connect

This paper presents calculations of the selection intensity of common selection and replacement methods used in genetic algorithms (GAs) with generation gaps. The selection intensity measures the increase of the average fitness of the population after selection, and it can be used to predict the average fitness of the population at each iteration as well as the number of steps until the population converges to a unique solution. In addition, the theory explains the fast convergence of some algorithms with small generation gaps. The accuracy of the calculations was verified experimentally with a simple test function. The results of this study facilitate comparisons between different algorithms, and provide a tool to adjust the selection pressure, which is indispensable to obtain robust algorithms.

Cantu-Paz, E.

2000-01-19T23:59:59.000Z

5

Unique marker finder algorithm generates molecular diagnostic markers  

Science Conference Proceedings (OSTI)

By taking advantage of the power of comparative genomics, we devised an algorithm, Unique Marker Finder (U-MarFin), to generate a collection of unique DNA sequences from a target organism. The whole target genome is partitioned into a scoring ...

Sung-Kay Chiu; Ming-Hua Hsieh; Chi-Meng Tzeng

2011-03-01T23:59:59.000Z

6

Natural gas generation lower than last year because of differences ...  

U.S. Energy Information Administration (EIA)

Total natural gas use for power generation in the United States was down 14% during the first seven months of 2013 compared to the same period in 2012 (see chart ...

7

An Algorithmic Argument for Nonadaptive Query Complexity Lower Bounds on Advised Quantum Computation  

E-Print Network (OSTI)

This paper employs a powerful argument, called an algorithmic argument, to prove lower bounds of the quantum query complexity of a multiple-block ordered search problem in which, given a block number i, we are to find a location of a target keyword in an ordered list of the i-th block. Apart from much studied polynomial and adversary methods for quantum query complexity lower bounds, our argument shows that the multiple-block ordered search needs a large number of nonadaptive oracle queries on a black-box model of quantum computation that is also supplemented with advice. Our argument is also applied to the notions of computational complexity theory: quantum truth-table reducibility and quantum truth-table autoreducibility.

Harumichi Nishimura; Tomoyuki Yamakami

2003-11-29T23:59:59.000Z

8

AN ALGORITHM FOR THE GENERATION OF NUCLEAR SPIN SPECIES AND NUCLEAR SPIN STATISTICAL WEIGHTS  

E-Print Network (OSTI)

Chemistry AN ALGORITHM FOR THE GENERATION OF NUCLEAR SPINSPECIES AND NUCLEAR SPIN STATISTICAL WEIGHTS K.for the Generation of Nuclear Spin and Nuclear Spin

Balasubramanian, K.

2013-01-01T23:59:59.000Z

9

A new generation of load sharing algorithms: the semi-adaptive load sharing algorithm  

E-Print Network (OSTI)

Distributed systems have become a popular computing environment. Due to their high potentials in improving performance and resource sharing, the evolution and maturing of technologies such as networks and computer hardware, have led to more realizations of distributed computing capabilities. One of the key factors that impacts the system's performance is how load sharing is handled. Most of the work done in load sharing algorithms focused on either one of two approaches: the static approach, or the dynamic approach. Static load sharing is characterized with its simplicity and minimal overhead induced on the system when performing load distribution. This is attributed to the fact that their load sharing decisions do not require any information exchange between nodes. However, static algorithms are not capable of adapting to traffic changes. Hence, this will affect the distributed system adaptability and stability features against load alteration. The second approach in load sharing algorithums is the dynamic approach. In this approach, nodes base their sharing decisions on the knowledge of the status on other nodes. This knowledge enables nodes to make improved decisions when selecting a remote execution site. Therefore, these algorithms provide the distributed system with adaptability and stability. Nevertheless, information exchange between nodes has proven to be expensive. The problem lies in the communication and processing overheads which these algorithms impose on the system. This research work presents a Semi-Adaptive load sharing approach that attempts to lay a common ground between the dynamic and the static approaches. This approach provides the system with adaptability features at are supplied with tools to control the level of adaptability and information exchange in the system. It is argued that this approach is adaptable, scalable, stable, fault tolerant, and will generate low and controlled system overheads. Two implementations of the Semi-Adaptive approach are presented: The Controller Load Sharing Protocol (CLSP) and The Pool Load Sharing Protocol (PLSP). The study of CLSP and PLSP include simulating their performance under various conditions. The simulation include comparing the performance of these two protocols against two load sharing algorithms representing the static and dynamic families. Furthermore, the properties of CLSP and PLSP are investigated. Finally, based on the study and analysis of both protocols, the research work proposes possible areas of improvement in the final conclusion.

Morsy, Hazem Kamal

1997-01-01T23:59:59.000Z

10

Current generation by unidirectional lower hybrid waves in the ACT-1 toroidal device  

SciTech Connect

An unambiguious experimental observation of current generation by unidirectional lower hybrid waves in a toroidal plasma is reported. Up to 10 amperes of current was driven by 500 watts of rf power at 160 MHz.

Wong, K.L.; Horton, R.; Ono, M.

1980-05-01T23:59:59.000Z

11

An Interior Point Constraint Generation Algorithm for Semi-Infinite Optimization with Health-Care Application  

Science Conference Proceedings (OSTI)

We propose an interior point constraint generation (IPCG) algorithm for semi-infinite linear optimization (SILO) and prove that the algorithm converges to an ?-solution of SILO after a finite number of constraints is generated. We derive a complexity ... Keywords: second-order cone optimization, sector duration optimization, semi-infinite linear optimization

Mohammad R. Oskoorouchi; Hamid R. Ghaffari; Tamás Terlaky; Dionne M. Aleman

2011-09-01T23:59:59.000Z

12

A survey of vertical handover decision algorithms in Fourth Generation heterogeneous wireless networks  

Science Conference Proceedings (OSTI)

Vertical handover decision (VHD) algorithms are essential components of the architecture of the forthcoming Fourth Generation (4G) heterogeneous wireless networks. These algorithms need to be designed to provide the required Quality of Service (QoS) ... Keywords: 4G, Fourth Generation, Vertical handover, Wireless networks

Xiaohuan Yan; Y. Ahmet ?ekercio?lu; Sathya Narayanan

2010-08-01T23:59:59.000Z

13

Steam Generator Management Program: Evaluation of Eddy Current Data Analysis Algorithms  

Science Conference Proceedings (OSTI)

As part of the U.S. Nuclear Regulatory Commission’s (NRC’s) International Steam Generator Tube Integrity Program, Argonne National Laboratory (ANL) was contracted to develop algorithms to assist in the analysis of rotating probe eddy current data. The algorithms were designed for both flaw detection and sizing. Rotating probe data collected on the flawed tubes in the NRC’s steam generator (SG) mockup were used to document the performance of the algorithms for both detection and ...

2012-09-28T23:59:59.000Z

14

Implementation of Distributed Key Generation Algorithms using Secure Sockets  

Science Conference Proceedings (OSTI)

Distributed Key Generation (DKG) protocols are indispensable in the design of any cryptosystem used in communication networks. DKG is needed to generate public/private keys for signatures or more generally for encrypting/decrypting messages. One such ...

A. T. Chronopoulos; F. Balbi; D. Veljkovic; N. Kolani

2004-08-01T23:59:59.000Z

15

Application of genetic algorithms for optimal reactive power planning of doubly fed induction generators  

Science Conference Proceedings (OSTI)

This paper describes optimal reactive power control of a doubly fed induction generator (DFIG), which is widely used in a distributed generating plant. Although its structure is similar to that of induction motors, its reactive power control is more ... Keywords: doubly fed induction generator, genetic algorithms, optimal reactive power planning, optimization

P. Sangsarawut; A. Oonsivilai; T. Kulworawanichpong

2010-03-01T23:59:59.000Z

16

Optimal reactive power planning of doubly fed induction generators using genetic algorithms  

Science Conference Proceedings (OSTI)

This paper describes optimal reactive power control of a doubly fed induction generator (DFIG), which is widely used in a distributed generating plant. Although its structure is similar to that of an induction motor, its reactive power control is more ... Keywords: doubly fed induction generator, genetic algorithms, optimal reactive power planning, optimization

P. Sangsarawut; A. Oonsivilai; T. Kulworawanichpong

2010-02-01T23:59:59.000Z

17

Optimising maximum power output and minimum entropy generation of Atkinson cycle using mutable smart bees algorithm  

Science Conference Proceedings (OSTI)

The purpose of this article is optimising maximum power output (MPO) and minimum entropy generation (MEG) of an Atkinson cycle as a multi-objective constraint thermodynamic problem by a new improved artificial bee colony algorithm which utilises 'mutable ...

Mofid Gorji; Ahmad Mozaffari; Sina Mohammadrezaei Noudeh

2012-07-01T23:59:59.000Z

18

An Improved Algorithm for Generating Global Window Brightness Temperatures from Multiple Satellite Infrared Imagery  

Science Conference Proceedings (OSTI)

An improved algorithm for the generation of gridded window brightness temperatures is presented. The primary data source is the International Satellite Cloud Climatology Project, level B3 data, covering the period from July 1983 to the present. ...

K. I. Hodges; D. W. Chappell; G. J. Robinson; G. Yang

2000-10-01T23:59:59.000Z

19

A meta-algorithm for the generation of referring expressions  

Science Conference Proceedings (OSTI)

This paper describes a new approach to the generation of referring expressions. We propose to formalize a scene as a labeled directed graph and describe content selection as a subgraph construction problem. Cost functions are used to guide ...

Emiel Krahmer; Sebastiaan van Erk; André Verleg

2001-07-01T23:59:59.000Z

20

Effects of a potential fourth fermion generation on the upper and lower Higgs boson mass bounds  

E-Print Network (OSTI)

We study the effect of a potential fourth fermion generation on the upper and lower Higgs boson mass bounds. This investigation is based on the numerical evaluation of a chirally invariant lattice Higgs-Yukawa model emulating the same Higgs-fermion coupling structure as in the Higgs sector of the electroweak Standard Model. In particular, the considered model obeys a Ginsparg-Wilson version of the underlying ${SU}(2)_L\\times {U}(1)_Y$ symmetry, being a global symmetry here due to the neglection of gauge fields in this model. We present our results on the modification of the upper and lower Higgs boson mass bounds induced by the presence of a hypothetical very heavy fourth quark doublet. Finally, we compare these findings to the standard scenario of three fermion generations.

Philipp Gerhold; Karl Jansen; Jim Kallarackal

2010-10-28T23:59:59.000Z

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


21

Harmonic Generation at Lower Electron Energies for a Hard X-ray FEL  

SciTech Connect

There are several schemes currently being investigated to pre-bunch the electron beam and step the coherent bunching up to higher harmonics, all which require modulator sections which introduce additional energy modulation. X-ray FELs operate in a regime where the FEL parameter, {rho} is equal to or less than the effective energy spread introduced from the emittance in the electron beam. Because of this large effective energy spread, the energy modulation introduced from harmonic generation schemes would seriously degrade FEL performance. This problem can be mitigated by incorporating the harmonic generation scheme at a lower electron kinetic energy than the energy at the final undulator. This will help because the effective energy spread from emittance is reduced at lower energies, and can be further reduced by making the beam transversely large. Then the beam can be squeezed down slowly enough in the subsequent accelerator sections so that geometric debunching is mitigated. The beam size inside the dispersive chicanes and in the accelerator sections must be carefully optimized to avoid debunching, and each subharmonic modulator section must generate enough energy modulation to overcome the SASE noise without significantly increasing the gain length in the final undulator. Here we show analytical results that demonstrate the feasibility of this harmonic pre-bunching scheme.

Marksteiner, Quinn R. [Los Alamos National Laboratory

2011-01-01T23:59:59.000Z

22

An Algorithm to Generate Deep-Layer Temperatures from Microwave Satellite Observations for the Purpose of Monitoring Climate Change  

Science Conference Proceedings (OSTI)

An algorithm for generating deep-layer mean temperatures from satellite-observed microwave observations is presented. Unlike traditional temperature retrieval methods, this algorithm does not require a first guess temperature of the ambient ...

Mitchell D. Goldberg; Henry E. Fleming

1995-05-01T23:59:59.000Z

23

Real time selective harmonic minimization for multilevel inverters using genetic algorithm and artifical neural network angle generation  

Science Conference Proceedings (OSTI)

The work developed here proposes a methodology for calculating switching angles for varying DC sources in a multilevel cascaded H-bridges converter. In this approach the required fundamental is achieved, the lower harmonics are minimized, and the system can be implemented in real time with low memory requirements. Genetic algorithm (GA) is the stochastic search method to find the solution for the set of equations where the input voltages are the known variables and the switching angles are the unknown variables. With the dataset generated by GA, an artificial neural network (ANN) is trained to store the solutions without excessive memory storage requirements. This trained ANN then senses the voltage of each cell and produces the switching angles in order to regulate the fundamental at 120 V and eliminate or minimize the low order harmonics while operating in real time.

Filho, Faete J [ORNL; Tolbert, Leon M [ORNL; Ozpineci, Burak [ORNL

2012-01-01T23:59:59.000Z

24

Application of genetic algorithm to improve voltage regulation of self-excited induction generator in a wind energy conversion system  

Science Conference Proceedings (OSTI)

Self-excited induction generators have been found to be most suitable for wind energy conversion in remote locations. In this paper, an attempt has been made to improve the voltage regulation of self-excited induction generator (SEIG) using series compensation. ... Keywords: genetic algorithms, intelligent systems, modelling, renewable energy, self-excited induction generators, simulation, voltage regulation, wind energy conversion systems, wind power

Dheeraj Joshi; K. S. Sandhu; M. K. Soni

2007-02-01T23:59:59.000Z

25

Assessing a Cloud Optical Depth Retrieval Algorithm with Model-Generated Data and the Frozen Turbulence Assumption  

Science Conference Proceedings (OSTI)

A cloud optical depth retrieval algorithm that utilizes time series of solar irradiance and zenith downwelling radiance data collected at a fixed surface site is assessed using model-generated cloud fields and simulated radiation measurements. To ...

H. W. Barker; C. F. Pavloski; M. Ovtchinnikov; E. E. Clothiaux

2004-12-01T23:59:59.000Z

26

Enumeration Conservation Law and Natural Parallelism of the D-algorithms for Test Generation and Modeling in Engineering Diagnostics  

Science Conference Proceedings (OSTI)

In Part I, typical and minimum diagnostic labyrinths that graphically model generation and modeling of tests were introduced using the D-algorithms. Notions of the value of diagnostic enumeration and the minimum value Prmin of this ...

P. A. Pravil'shchikov

2004-07-01T23:59:59.000Z

27

Implications of Lower Natural Gas Prices for Electric Generators in the Southeast, The  

Reports and Publications (EIA)

This supplement to the Energy Information Administration's (EIA) May 2009 Short-Term Energy Outlook (STEO) focuses on changes in the utilization of coal- and natural-gas-fired generation capacity in the electric utility sector as the differential between delivered fuel prices narrows.

Information Center

2009-05-12T23:59:59.000Z

28

Steam Generator Management Program: Development of Automated Data Analysis Algorithms for Assessment of SG Tube Degradation  

Science Conference Proceedings (OSTI)

Automated eddy current data analysis systems for detection of steam generator (SG) tube degradation can provide significant benefits to utilities. Potential benefits include lower costs by reducing labor and equipment requirement needs and by providing analysis results at rates comparable to those for data acquisition; savings in time resulting from reducing the impact of data analyst shortages during peak outage periods; and reliability improvements by providing consistent, repeatable, and accurate ...

2013-12-18T23:59:59.000Z

29

VFL-HF heating of the lower ionosphere and ELF wave generation  

SciTech Connect

For incident wave power densities of 10{sup {minus}6} {minus} 10{sup {minus}2} W/m{sup 2} (at 30 km altitude), VLF heating of the D-region (< 90 km) is found to be 2-10 times more effective (depending on power) than HF heating, resulting in comparable perturbations of subionospheric VLF probe waves in spite of up to 10{sup 3} times larger power density utilized in HF heating and at least as efficient in ELF wave generation. In view of generally larger (100 {times} 100 km) area of the ionosphere illuminated by VLF transmitters, ELF wave generation by modulated VLF heating is estimated to produce ELF power levels of {approximately}100 mW, comparable with or larger than those produced in typical midlatitude ambient ionosphere occurs primarily via the modulation of Pedersen current whereas in a typical auroral ionosphere Hall current is dominant for pump wave frequencies up to {approximately}6 MHz. For 10-30 MHz and power densities > 10{sup {minus}4} W/m{sup 2}, Pedersen current modulation is again dominant, potentially providing up to 2-15 times higher ELF dipole moment than those found in recent experiments using 3-5 MHz heaters.

Taranenko, Y.N.; Inan, U.S.; Bell, T.F. (Stanford Univ., CA (United States))

1992-01-03T23:59:59.000Z

30

Implementation of a voice activity detection and comfort noise generation algorithm.  

E-Print Network (OSTI)

??This thesis is devoted to the investigation of effective implementations of a modified version of a well-established fixed-point data-dependent VAD-CNG algorithm of Nortel Networks. In… (more)

Liang, Jing

2004-01-01T23:59:59.000Z

31

Man-portable power generation devices : product design and supporting algorithms  

E-Print Network (OSTI)

A methodology for the optimal design and operation of microfabricated fuel cell systems is proposed and algorithms for relevant optimization problems are developed. The methodology relies on modeling, simulation and ...

Mitsos, Alexander

2006-01-01T23:59:59.000Z

32

Convectively Generated Internal Gravity Waves in the Lower Atmosphere of Venus. Part II: Mean Wind Shear and Wave–Mean Flow Interaction  

Science Conference Proceedings (OSTI)

This paper is the second of a two-part study that numerically investigates internal gravity wave generation by convection in the lower atmosphere of Venus. Part I of this study considers gravity wave generation and propagation in the absence of ...

R. David Baker; Gerald Schubert; Philip W. Jones

2000-01-01T23:59:59.000Z

33

Three-dimensional midpoint displacement algorithm for the generation of fractal porous media  

Science Conference Proceedings (OSTI)

We propose a novel method of generating fractal three-dimensional porous media geometry. The method is an extension of the two-dimensional midpoint displacement method, used to generate realistic looking terrain for graphics applications, to a third ... Keywords: Fractal, Periodic boundary conditions, Porous media generation

Jonathan Jilesen; Jim Kuo; Fue-Sang Lien

2012-09-01T23:59:59.000Z

34

Implementation of a feature-constraint mesh generation algorithm within a GIS  

Science Conference Proceedings (OSTI)

Unstructured mesh generation has long been a labor-intensive and time-consuming aspect of hydrologic modeling. This is largely due to the iterative nature of the process and the limited integration between the specialized mesh generation software and ... Keywords: Constrained Delaunay triangulation, Discretization, Finite element, GIS, Hydrologic modeling, Mesh generation

Thomas J. Heinzer; M. Diane Williams; Emin C. Dogrul; Tariq N. Kadir; Charles F. Brush; Francis I. Chung

2012-12-01T23:59:59.000Z

35

Evaluation of Breast Cancer Susceptibility Using Improved Genetic Algorithms to Generate Genotype SNP Barcodes  

Science Conference Proceedings (OSTI)

Genetic association is a challenging task for the identification and characterization of genes that increase the susceptibility to common complex multifactorial diseases. To fully execute genetic studies of complex diseases, modern geneticists face the ... Keywords: breast cancer,Single nucleotide polymorphism,SNP-SNP interactions,genetic algorithm

Cheng-Hong Yang; Yu-Da Lin; Li-Yeh Chaung; Hsueh-Wei Chang

2013-03-01T23:59:59.000Z

36

An study of the tree generation algorithms in equation based model learning with low quality data  

Science Conference Proceedings (OSTI)

The undesired effects of data gathered from real world can be produced by the noise in the process, the bias of the sensors and the presence of hysteresis, among other uncertainty sources. In previous works the learning models using the so-called Low ... Keywords: genetic algorithm and programming, genetic programming, low quality data, multiobjective simulated annealing

Alba Berzosa; José R. Villar; Javier Sedano; Marco García-Tamargo; Enrique de la Cal

2011-05-01T23:59:59.000Z

37

Symbolic-numerical Algorithm for Generating Cluster Eigenfunctions: Tunneling of Clusters Through Repulsive Barriers  

E-Print Network (OSTI)

A model for quantum tunnelling of a cluster comprising A identical particles, coupled by oscillator-type potential, through short-range repulsive potential barriers is introduced for the first time in the new symmetrized-coordinate representation and studied within the s-wave approximation. The symbolic-numerical algorithms for calculating the effective potentials of the close-coupling equations in terms of the cluster wave functions and the energy of the barrier quasistationary states are formulated and implemented using the Maple computer algebra system. The effect of quantum transparency, manifesting itself in nonmonotonic resonance-type dependence of the transmission coefficient upon the energy of the particles, the number of the particles A=2,3,4, and their symmetry type, is analyzed. It is shown that the resonance behavior of the total transmission coefficient is due to the existence of barrier quasistationary states imbedded in the continuum.

Vinitsky, Sergue; Chuluunbaatar, Ochbadrakh; Rostovtsev, Vitaly; Hai, Luong Le; Derbov, Vladimir; Krassovitskiy, Pavel

2013-01-01T23:59:59.000Z

38

Determination of Applicability of EDF Steam Generator Monitoring Algorithm to Pressurized Water Reactors Worldwide  

Science Conference Proceedings (OSTI)

This report documents work undertaken by the Electric Power Research Institute (EPRI) and Electricité de France (EDF) to determine the applicability of an EDF technique that estimates the level of deposit buildup on the steam generator's (SG's) tube support plates (TSPs) to plants worldwide.

2010-12-23T23:59:59.000Z

39

Generation of optimal artificial neural networks using a pattern search algorithm: Application to approximation of chemical systems  

Science Conference Proceedings (OSTI)

A pattern search optimization method is applied to the generation of optimal artificial neural networks (ANNs). Optimization is performed using a mixed variable extension to the generalized pattern search method. This method offers the advantage that ...

Matthias Ihme; Alison L. Marsden; Heinz Pitsch

2008-02-01T23:59:59.000Z

40

Development Of A Power Efficient Image Coding Algorithm Based On Integer Wavelet Transform  

E-Print Network (OSTI)

A novel algorithm for very high compression of grayscale images presenting features that lead to power efficient implementations is proposed. A simple methodology based on a hierarchical three- stage exploration of the algorithmic design space has been adopted for the conception of the algorithm. The proposed algorithm is based on an integer wavelet transform, which is much more efficient in terms of data storage and transfer compared to the widely used real wavelet transforms. For the coding of the coefficients of the wavelet transform fractal techniques using small size computationally generated codebooks are applied. The performance of the proposed algorithm is comparable to or better than that of existing standard algorithms. It is estimated using state-ofthe -art high-level power estimation techniques that the proposed algorithm achieves lower power consumption by several times compared to existing standard algorithms. 1.

Masselos Karayiannis Andreopoulos; K. Masselos; Y. Karayiannis; I. Andreopoulos; T. Stouraitis

2000-01-01T23:59:59.000Z

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


41

Lower railroad energy consumption reflects improved efficiency ...  

U.S. Energy Information Administration (EIA)

Electricity. Sales, revenue and prices, power plants, fuel use, stocks, generation, ... Tonnage moved in 2012 was significantly lower than the 2006 ...

42

Distributed Generation  

NLE Websites -- All DOE Office Websites (Extended Search)

Untapped Value of Backup Generation Untapped Value of Backup Generation While new guidelines and regulations such as IEEE (Institute of Electrical and Electronics Engineers) 1547 have come a long way in addressing interconnection standards for distributed generation, utilities have largely overlooked the untapped potential of these resources. Under certain conditions, these units (primarily backup generators) represent a significant source of power that can deliver utility services at lower costs than traditional centralized solutions. These backup generators exist today in large numbers and provide utilities with another option to reduce peak load, relieve transmission congestion, and improve power reliability. Backup generation is widely deployed across the United States. Carnegie Mellon's Electricity

43

Design of an Enhanced Handover Algorithm Based on a New Adaptive SR-ARQ for Next-Generation Mobile Communication Networks  

Science Conference Proceedings (OSTI)

Next-generation mobile communication networks are supposed to provide various high capacity multimedia services to mobile users using various kinds of access networks. Among them, the WiNGS system developed by ETRI as one of 4G mobile system provides ... Keywords: Mobile communication networks, handover performance, SR-ARQ, reordering, WiNGS system

Man Kyu Park; Yun Chul Choi; Jae Yone Lee; Byung Chul Kim; Dae Young Kim; Jae Ho Kim

2008-12-01T23:59:59.000Z

44

Arctic Lower Troposphere Observed Structure (ALTOS)  

NLE Websites -- All DOE Office Websites (Extended Search)

Lower Troposphere Observed Structure (ALTOS) Lower Troposphere Observed Structure (ALTOS) will raise and lower a heavily instrumented tethered balloon system at regular intervals in the lower 2 kilometers of the atmosphere at Oliktok Point. Data obtained during the ALTOS campaign will provide a statistically significant set of observed in situ cloud properties for validating retrieval algorithms and help scientists reduce the uncertainty in the radiative forcing and heating rates on hourly time scales. The data will also help researchers gain a better understanding of the driving processes that control climate changes and determine the state of the Arctic climate system. Collaborators Science Team: The Pennsylvania State University, Stratton

45

The generation of HCl in the system NaCl-KCl-H{sub 2}O-quartz at 600{degrees}C: Implications regarding HCl in natural systems at lower temperatures  

SciTech Connect

In experiments at 600°C in the system NaCI-KCI-H2O, within the analytical uncertainty, stoichiometric quantities of Cl and total alkali metals (Na+K) appear to dissolve in steam coexisting with chloride-rich brine at high pressures in the absence of solid salt. In contrast, at lower pressures, where steam coexists with precipitated salts, significant excess chloride as associated hydrogen chloride (HCI°) dissolves in steam. The HCI° appears to be generated by the reaction of solid NaCl(s) (halite) with steam, producing solid NaOH(s) that diffuses into halite, forming a solid solution. Where HCI° is present highly associated NaOH° as well as associated NaCI° appear to dissolve in steam, and the solubility of each is increased as the mole fraction of NaOH(s) in halite increases. In our quasi-static experiments, compared to dynamic flow-through experiments of others, higher initial ratios of H2O/NaCI have resulted in higher mole fractions of NaOH(s) in solid solution in halite and, accordingly, higher solubilities of NaCI" and NaOH" dissolved in steam. Addition of quartz to the system NaCI-KCI-H2O results in the formation of sodium disilicate by reaction of silica with NaOH(s) and an order of magnitude increase in the concentration of HCl° dissolved in steam. In natural hydrothermal systems at lower temperatures where brine or brine plus steam are present in the absence of precipitated salt, the pH of the brine is controlled mainly by base exchange reactions involving a variety of silicates that fix Na+/H+ and K+/H+ activity ratios. Where feldspars are present pH values generally are near neutral. Where mica, but no feldspar is present pH values may become only moderately acid. High acidity in salt-absent brine systems occurs only where all feldspars and mica have been altered to other minerals (generally pyrophyllite/ kaolinite or alunite). The situation changes significantly when salt precipitates. Hydrolysis produces HCI° by the reaction of water with NaCl when halite is present. The NaOH(s) that is produced as a byproduct is likely to react with quartz plus various alumino-silicates, producing a variety of alteration products and allowing steam to become greatly enriched in HCl° compared to the composition of steam that is attained in the simple system NaCI-KCI-H2O with halite present. Also, when a natural high-temperature hydrothermal system changes from one in which the pore fluid is brine to one in which the pore fluid is dry steam there is a drastic change in Na+/H+ and K+/H+ activity ratios in the pore fluid because the hydrogen ions that were predominantly dissociated species in the brine become predominantly associated species in steam. The net result is the stabilization of alkali feldspars in contact with steam that may contain appreciable HCI° that is produced by the reaction of precipitated salt with the steam.

Fournier, Robert O.; Thompson, J. Michael

1993-01-28T23:59:59.000Z

46

Quantum Networks for Generating Arbitrary Quantum States  

E-Print Network (OSTI)

Quantum protocols often require the generation of specific quantum states. We describe a quantum algorithm for generating any prescribed quantum state. For an important subclass of states, including pure symmetric states, this algorithm is efficient.

Phillip Kaye; Michele Mosca

2004-07-14T23:59:59.000Z

47

An iterative distributed algorithm for multi-constraint multicast routing  

Science Conference Proceedings (OSTI)

In this paper, we propose a group computation based distributed algorithm for solving the problem of multi-constraint multicast routing. This algorithm is fully distributed and can generate within acceptable time and message complexities a multicast ... Keywords: Distributed algorithm, Heuristic algorithm, Multicast, Multicast routing tree, Multiple constraints, NP-hardness, QoS, Routing protocol

Tzu-Lun Huang; D. T. Lee

2006-11-01T23:59:59.000Z

48

The Rational Hybrid Monte Carlo Algorithm  

E-Print Network (OSTI)

The past few years have seen considerable progress in algorithmic development for the generation of gauge fields including the effects of dynamical fermions. The Rational Hybrid Monte Carlo (RHMC) algorithm, where Hybrid Monte Carlo is performed using a rational approximation in place the usual inverse quark matrix kernel is one of these developments. This algorithm has been found to be extremely beneficial in many areas of lattice QCD (chiral fermions, finite temperature, Wilson fermions etc.). We review the algorithm and some of these benefits, and we compare against other recent algorithm developements. We conclude with an update of the Berlin wall plot comparing costs of all popular fermion formulations.

M. A. Clark

2006-10-06T23:59:59.000Z

49

Quantum Algorithms for Learning and Testing Juntas  

Science Conference Proceedings (OSTI)

In this article we develop quantum algorithms for learning and testing juntas, i.e. Boolean functions which depend only on an unknown set of k out of n ... Keywords: 03.67.-a, 03.67.Lx, Juntas, computational learning theory, lower bounds, quantum computation, quantum property testing, quantum query algorithms

Alp At?c?; Rocco A. Servedio

2007-10-01T23:59:59.000Z

50

Evaluation of RADAP II Severe-Storm-Detection Algorithms  

Science Conference Proceedings (OSTI)

Computer-generated volumetric radar algorithms have been available at a few operational National Weather Service sites since the mid-1970s under the Digitized Radar Experiment (D/RADFX) and Radar Data Processor (RADAP II) programs. The algorithms ...

Herb A. Winston; Larry J. Ruthi

1986-02-01T23:59:59.000Z

51

Advanced CHP Control Algorithms: Scope Specification  

SciTech Connect

The primary objective of this multiyear project is to develop algorithms for combined heat and power systems to ensure optimal performance, increase reliability, and lead to the goal of clean, efficient, reliable and affordable next generation energy systems.

Katipamula, Srinivas; Brambley, Michael R.

2006-04-28T23:59:59.000Z

52

Study of Lower Emittance Lattices for SPEAR3  

Science Conference Proceedings (OSTI)

We study paths to significantly reduce the emittance of the SPEAR3 storage ring. Lattice possibilities are explored with the GLASS technique. New lattices are designed and optimized for practical dynamic aperture and beam lifetime. Various techniques are employed to optimize the nonlinear dynamics, including the Elegant-based genetic algorithm. Experimental studies are also carried out on the ring to validate the lattice design. The SPEAR3 storage ring is a third generation light source which has a racetrack layout with a circumference of 234.1 m. The requirement to maintain the photon beamline positions put a significant constraint on the lattice design. Consequently the emittance of SPEAR3 is not on par with some of the recently-built third generation light sources. The present operational lattice has an emittance of 10 nm. For the photon beam brightness of SSRL to remain competitive among the new or upgraded ring-based light sources, it is necessary to significantly reduce the emittance of SPEAR3. In this paper we report our ongoing effort to develop a lower emittance solution for SSRL. We first show the potential of the SPEAR3 lattice with results of the standard cell study using the GLASS technique. This is followed by a discussion of the design strategy for full-ring linear lattices. Several lattice options are compared. We then show the methods and results for dynamic aperture optimization. Experiments were also conducted on the SPEAR3 ring to implement the lattice and to measure the key lattice parameters.

Huang, Xiaobiao; Nosochkov, Yuri; Safranek, James A.; Wang, Lanfa; /SLAC

2011-11-08T23:59:59.000Z

53

Some modifications of bucket-based algorithms for query rewriting using views  

Science Conference Proceedings (OSTI)

Query rewriting using views is an important topic in data integration. A number of rewriting algorithms, such as the SVB algorithm, the MiniCon algorithm and the inverse rules algorithm, have been developed. All the algorithms can generate a maximally-contained ...

Qingyuan Bai; Jun Hong; Michael F. McTear

2004-10-01T23:59:59.000Z

54

Ensemble of niching algorithms  

Science Conference Proceedings (OSTI)

Although niching algorithms have been investigated for almost four decades as effective procedures to obtain several good and diverse solutions of an optimization problem, no effort has been reported on combining different niching algorithms to form ... Keywords: Clearing, Dynamic fitness sharing, Ensemble, Genetic algorithm, Multimodal optimization, Niching, Pattern search, Real-coded sequential niching memetic algorithm, Restricted competition selection, Restricted tournament selection, Spatially-structured evolutionary algorithm, Species conserving genetic algorithm

E. L. Yu; P. N. Suganthan

2010-08-01T23:59:59.000Z

55

An Improved Cloud Classification Algorithm Based on the SGP CART...  

NLE Websites -- All DOE Office Websites (Extended Search)

studies which need to group clouds according to cloud types, but also provides necessary information to implement different retrieval algorithms to generate integrated cloud...

56

SEANO: Structure-Exploiting Algorithms for Nonlinear Optimization...  

NLE Websites -- All DOE Office Websites (Extended Search)

Algorithms for Nonlinear Optimization Advances in high-performance computing have led to a new generation of complex optimization problems that span the breadth of...

57

Dictionary preconditioning for greedy algorithms  

E-Print Network (OSTI)

This article introduces the concept of sensing dictionaries. It presents an alteration of greedy algorithms like thresholding or (Orthogonal) Matching Pursuit which improves their performance in finding sparse signal representations in redundant dictionaries while maintaining the same complexity. These algorithms can be split into a sensing and a reconstruction step, and the former will fail to identify correct atoms if the cumulative coherence of the dictionary is too high. We thus modify the sensing step by introducing a special sensing dictionary. The correct selection of components is then determined by the cross cumulative coherence which can be considerably lower than the cumulative coherence. We characterise the optimal sensing matrix and develop a constructive method to approximate it. Finally we compare the performance of thresholding and OMP using the original and modified algorithms.

Karin Schnass; Pierre Vandergheynst

1994-01-01T23:59:59.000Z

58

Automatic test generation using genetically-engineered distinguishing sequences  

Science Conference Proceedings (OSTI)

A fault-oriented sequential circuit test generator is described in which various types of distinguishing sequences are derived, both statically and dynamically, to aid the test generation process. A two-phase algorithm is used during test generation. ... Keywords: DIGATE, automatic test generation, automatic testing, distinguishing sequence, fault diagnosis, fault effects, flip-flops, genetic algorithm, genetic algorithms, logic testing, sequences, sequential circuit, sequential circuits, two-phase algorithm

M. S. Hsiao; E. M. Rudnick; J. H. Patel

1996-04-01T23:59:59.000Z

59

Instrumentation and transformation of Java source code for automated testing with search-based testing algorithms.  

E-Print Network (OSTI)

??Search-based Software Test Data Generation is a ?eld of research treating test input generation as a search problem. Search algorithms require that an objective function… (more)

Jansen, Karsten

2010-01-01T23:59:59.000Z

60

Quantization effects and stabilization of the fast-Kalman algorithm  

Science Conference Proceedings (OSTI)

The exact and actual cause of the failure of the fast-Kalman algorithm due to the generation and propagation of finite-precision or quantization error is presented. It is demonstrated that out of all the formulas that constitute this fast Recursive Least ... Keywords: Kalman filtering, adaptive algorithms, finite-precision error in RLS algorithms, quantization error in fast-Kalman algorithm, recursive least squares filtering

Constantin Papaodysseus; Constantin Alexiou; George Roussopoulos; Athanasios Panagopoulos

2001-01-01T23:59:59.000Z

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


61

Natural gas generation lower than last year because of differences ...  

U.S. Energy Information Administration (EIA)

Petroleum & Other Liquids. Crude oil, gasoline, heating oil, diesel, propane, and other liquids including biofuels and natural gas liquids. Natural Gas

62

Applications of a Velocity Dealiasing Scheme to Data from the China New Generation Weather Radar System (CINRAD)  

Science Conference Proceedings (OSTI)

An improved velocity dealiasing algorithm is developed as an extension of the Next Generation Weather Radar (NEXRAD) dealiasing algorithm. The algorithm described in this paper is evaluated on selected China Next Generation Weather Radar (CINRAD) ...

Guangxin He; Gang Li; Xiaolei Zou; Peter Sawin Ray

2012-02-01T23:59:59.000Z

63

Lower Hybrid to Whistler Wave Conversion  

Science Conference Proceedings (OSTI)

In this presentation we discuss recent work concerning the conversion of whistler waves to lower hybrid waves (as well as the inverse process). These efforts have been motivated by the issue of attenuation of upward propagating whistler waves in the ionosphere generated by VLF transmitters on the ground, i.e., the 'Starks 20 db' problem, which affects the lifetimes of energetic electrons trapped in the geomagnetic field at low magnetic altitude (L). We discuss recent fluid and kinetic plasma simulations as well as ongoing experiments at UCLA to quantify linear and nonlinear mode conversion of lower hybrid to whistler waves.

Winske, Dan [Los Alamos National Laboratory

2012-07-16T23:59:59.000Z

64

Reconstruction algorithms for MRI  

E-Print Network (OSTI)

This dissertation presents image reconstruction algorithms for Magnetic Resonance Imaging (MRI) that aims to increase the imaging efficiency. Algorithms that reduce imaging time without sacrificing the image quality and ...

Bilgic?, Berkin

2013-01-01T23:59:59.000Z

65

Grover search algorithm  

E-Print Network (OSTI)

A quantum algorithm is a set of instructions for a quantum computer, however, unlike algorithms in classical computer science their results cannot be guaranteed. A quantum system can undergo two types of operation, measurement and quantum state transformation, operations themselves must be unitary (reversible). Most quantum algorithms involve a series of quantum state transformations followed by a measurement. Currently very few quantum algorithms are known and no general design methodology exists for their construction.

Borbely, Eva

2007-01-01T23:59:59.000Z

66

ALGORITHM FOR ACCNT  

Energy Science and Technology Software Center (OSTI)

002651IBMPC00 Algorithm for Accounting for the Interactions of Multiple Renewable Energy Technologies in Estimation of Annual Performance   

67

Quantum Algorithm Zoo  

Science Conference Proceedings (OSTI)

... 27 Andrew M. Childs, Richard Cleve, Stephen P. Jordan, and David Yeung Discrete-query quantum algorithm for NAND trees. ...

2013-11-11T23:59:59.000Z

68

Population Monte Carlo algorithms  

E-Print Network (OSTI)

We give a cross-disciplinary survey on ``population'' Monte Carlo algorithms. In these algorithms, a set of ``walkers'' or ``particles'' is used as a representation of a high-dimensional vector. The computation is carried out by a random walk and split/deletion of these objects. The algorithms are developed in various fields in physics and statistical sciences and called by lots of different terms -- ``quantum Monte Carlo'', ``transfer-matrix Monte Carlo'', ``Monte Carlo filter (particle filter)'',``sequential Monte Carlo'' and ``PERM'' etc. Here we discuss them in a coherent framework. We also touch on related algorithms -- genetic algorithms and annealed importance sampling.

Yukito IBA

2000-08-16T23:59:59.000Z

69

A self-organizing random immigrants genetic algorithm for dynamic optimization problems  

Science Conference Proceedings (OSTI)

In this paper a genetic algorithm is proposed where the worst individual and individuals with indices close to its index are replaced in every generation by randomly generated individuals for dynamic optimization problems. In the proposed genetic algorithm, ... Keywords: Dynamic optimization problems, Genetic algorithms, Random immigrants, Self-organized criticality

Renato Tinós; Shengxiang Yang

2007-09-01T23:59:59.000Z

70

Quantum Algorithms for Graph Problems -- A Survey  

E-Print Network (OSTI)

In this survey we give an overview about important methods to construct quantum algorithms and quantum lower bounds for graph problems. We show how to use these methods, and we give a summary about the quantum complexity of the most important graph problems. At the end of our paper, we give some interesting questions in this research area.

Sebastian Dörn

2006-01-01T23:59:59.000Z

71

Selective Sampling Using the Query by Committee Algorithm  

Science Conference Proceedings (OSTI)

We analyze the “query by committee” algorithm, a method for filtering informative queries from a random stream of inputs. We show that if the two-member committee algorithm achieves information gain with positive lower bound, then the ... Keywords: Bayesian Learning, experimental design, query learning, selective sampling

Yoav Freund; H. Sebastian Seung; Eli Shamir; Naftali Tishby

1997-09-01T23:59:59.000Z

72

An algorithm for map enumeration  

E-Print Network (OSTI)

Bauer and Itzykson showed that associated to each labeled map embedded on an oriented Riemann surface there was a group generated by a pair of permutations. From this result an algorithm may be constructed for enumerating labeled maps, and this construction is easily augmented to bin the numbers by the genus of the surface the map is embedded in. The results agree with the calculations of Harer and Zagier of 1-vertex maps; with those of Bessis, Itzykson, and Zuber of 4-valent maps; and with those of Ercolani, McLaughlin, and Pierce for $2\

Virgil U. Pierce

2006-10-19T23:59:59.000Z

73

Cryptographic Hash Algorithm Competition  

Science Conference Proceedings (OSTI)

... NIST opened a public competition on November 2, 2007 to develop a new cryptographic hash algorithm, which converts a variable length message ...

2013-08-01T23:59:59.000Z

74

Self-generation ART neural network for character recognition  

Science Conference Proceedings (OSTI)

In this paper, we present a novel self-generation, supervised character recognition algorithm based on adaptive resonance theory (ART) artificial neural network (ANN) and delta-bar-delta method. By combining two methods, the proposed algorithm can reduce ...

Taekyung Kim; Seongwon Lee; Joonki Paik

2006-05-01T23:59:59.000Z

75

A digital control algorithm for diesel engine governing  

SciTech Connect

The performance of a microprocessor based precision engine speed control system was investigated. A sample rate selection criteria is presented along with a procedure to implement a high performance digital PID control algorithm. The algorithm requires a digital speed sensor of 12 to 14 bits to minimize excessive fuel rack motion at a steady state due to digital quantization effects. Computer simulation and experimental test results of the algorithm are presented for an 1800 RPM, 125 Kilowatt engine generator set.

Garvey, P.C.

1985-01-01T23:59:59.000Z

76

Quantum Statistical Testing of a QRNG Algorithm  

Science Conference Proceedings (OSTI)

We present the algorithmic design of a quantum random number generator, the subsequent synthesis of a physical design and its verification using quantum statistical testing. We also describe how quantum statistical testing can be used to diagnose channel noise in QKD protocols.

Humble, Travis S [ORNL; Pooser, Raphael C [ORNL; Britt, Keith A [ORNL

2013-01-01T23:59:59.000Z

77

Algorithmic parameterization of mixed treatment comparisons  

Science Conference Proceedings (OSTI)

Mixed Treatment Comparisons (MTCs) enable the simultaneous meta-analysis (data pooling) of networks of clinical trials comparing ¿2 alternative treatments. Inconsistency models are critical in MTC to assess the overall consistency between evidence sources. ... Keywords: Algorithm, Evidence consistency, Indirect comparisons, Mixed treatment comparison, Model generation, Network meta-analysis

Gert Valkenhoef; Tommi Tervonen; Bert Brock; Hans Hillege

2012-09-01T23:59:59.000Z

78

Designing Effective Algorithm Visualizations  

E-Print Network (OSTI)

Advances in computing technology and the aordability of software and high-performance graphics hardware enabled rapid growth of visual tools. Today, not only very expensive workstations, but also low-cost PCs are capable of running computationally demanding visualization systems. Algorithm visualizations or the graphic depiction of algorithms in execution have been used in explaining, designing and analyzing algorithms since the early 1980s. Although many tools have been developed over the past twenty years, not enough attention has been paid to the analysis of users, their needs, tasks, and goals. This paper provides an overview of algorithm visualization techniques, based on the premise that a rethinking of algorithm animation design is required in order to harness its power for enhancing learning. More information about the topic can be found on the author's web page. 1

Sami Khuri

2001-01-01T23:59:59.000Z

79

Lower Colorado River Authority | Open Energy Information  

Open Energy Info (EERE)

River Authority River Authority Jump to: navigation, search Name Lower Colorado River Authority Place Texas Utility Id 11269 Utility Location Yes Ownership S NERC Location TRE NERC ERCOT Yes ISO Ercot Yes Operates Generating Plant Yes Activity Generation Yes Activity Transmission Yes Activity Buying Transmission Yes Activity Distribution Yes Activity Bundled Services Yes Alt Fuel Vehicle Yes Alt Fuel Vehicle2 Yes References EIA Form EIA-861 Final Data File for 2010 - File1_a[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png No rate schedules available. Average Rates No Rates Available References ↑ "EIA Form EIA-861 Final Data File for 2010 - File1_a"

80

Sampling Within k-Means Algorithm to Cluster Large Datasets  

Science Conference Proceedings (OSTI)

Due to current data collection technology, our ability to gather data has surpassed our ability to analyze it. In particular, k-means, one of the simplest and fastest clustering algorithms, is ill-equipped to handle extremely large datasets on even the most powerful machines. Our new algorithm uses a sample from a dataset to decrease runtime by reducing the amount of data analyzed. We perform a simulation study to compare our sampling based k-means to the standard k-means algorithm by analyzing both the speed and accuracy of the two methods. Results show that our algorithm is significantly more efficient than the existing algorithm with comparable accuracy. Further work on this project might include a more comprehensive study both on more varied test datasets as well as on real weather datasets. This is especially important considering that this preliminary study was performed on rather tame datasets. Also, these datasets should analyze the performance of the algorithm on varied values of k. Lastly, this paper showed that the algorithm was accurate for relatively low sample sizes. We would like to analyze this further to see how accurate the algorithm is for even lower sample sizes. We could find the lowest sample sizes, by manipulating width and confidence level, for which the algorithm would be acceptably accurate. In order for our algorithm to be a success, it needs to meet two benchmarks: match the accuracy of the standard k-means algorithm and significantly reduce runtime. Both goals are accomplished for all six datasets analyzed. However, on datasets of three and four dimension, as the data becomes more difficult to cluster, both algorithms fail to obtain the correct classifications on some trials. Nevertheless, our algorithm consistently matches the performance of the standard algorithm while becoming remarkably more efficient with time. Therefore, we conclude that analysts can use our algorithm, expecting accurate results in considerably less time.

Bejarano, Jeremy [Brigham Young University; Bose, Koushiki [Brown University; Brannan, Tyler [North Carolina State University; Thomas, Anita [Illinois Institute of Technology; Adragni, Kofi [University of Maryland; Neerchal, Nagaraj [University of Maryland; Ostrouchov, George [ORNL

2011-08-01T23:59:59.000Z

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


81

Motif Discovery Using Evolutionary Algorithms  

Science Conference Proceedings (OSTI)

The bacterial foraging optimization (BFO) algorithm is a nature and biologically inspired computing method. We propose an alternative solution integrating bacterial foraging optimization algorithm and tabu search (TS) algorithm namely TS-BFO. We modify ...

Linlin Shao; Yuehui Chen; Ajith Abraham

2009-12-01T23:59:59.000Z

82

Automatic toilet seat lowering apparatus  

DOE Patents (OSTI)

A toilet seat lowering apparatus includes a housing defining an internal cavity for receiving water from the water supply line to the toilet holding tank. A descent delay assembly of the apparatus can include a stationary dam member and a rotating dam member for dividing the internal cavity into an inlet chamber and an outlet chamber and controlling the intake and evacuation of water in a delayed fashion. A descent initiator is activated when the internal cavity is filled with pressurized water and automatically begins the lowering of the toilet seat from its upright position, which lowering is also controlled by the descent delay assembly. In an alternative embodiment, the descent initiator and the descent delay assembly can be combined in a piston linked to the rotating dam member and provided with a water channel for creating a resisting pressure to the advancing piston and thereby slowing the associated descent of the toilet seat. A toilet seat lowering apparatus includes a housing defining an internal cavity for receiving water from the water supply line to the toilet holding tank. A descent delay assembly of the apparatus can include a stationary dam member and a rotating dam member for dividing the internal cavity into an inlet chamber and an outlet chamber and controlling the intake and evacuation of water in a delayed fashion. A descent initiator is activated when the internal cavity is filled with pressurized water and automatically begins the lowering of the toilet seat from its upright position, which lowering is also controlled by the descent delay assembly. In an alternative embodiment, the descent initiator and the descent delay assembly can be combined in a piston linked to the rotating dam member and provided with a water channel for creating a resisting pressure to the advancing piston and thereby slowing the associated descent of the toilet seat.

Guerty, Harold G. (Palm Beach Gardens, FL)

1994-09-06T23:59:59.000Z

83

Guaranteed-quality anisotropic mesh generation for domains with curved boundaries  

Science Conference Proceedings (OSTI)

Anisotropic mesh generation is important for interpolation and numerical modeling. Recently, Labelle and Shewchuk proposed a two-dimensional guaranteed-quality anisotropic mesh generation algorithm called a Voronoi refinement algorithm. This algorithm ... Keywords: Anisotropic Voronoi diagram, Anisotropic mesh generation, Curved boundaries, Guaranteed-quality

Yusuke Yokosuka; Keiko Imai

2009-05-01T23:59:59.000Z

84

The Cambridge Jet algorithm: features and applications  

E-Print Network (OSTI)

Jet clustering algorithms are widely used to analyse hadronic events in high energy collisions. Recently a new clustering method, known as `Cambridge', has been introduced. In this article we present an algorithm to determine the transition values of y_cut for this clustering scheme, which allows to resolve any event to a definite number of jets in the final state. We discuss some particularities of the Cambridge clustering method and compare its performance to the Durham clustering scheme for Monte Carlo generated e+e- annihilation events.

Stan Bentvelsen; Irmtraud Meyer

1998-03-12T23:59:59.000Z

85

Monte Carlo simulation-based algorithms for estimating the reliability of mobile agent-based systems  

Science Conference Proceedings (OSTI)

In this paper, we propose two algorithms for estimating the task route reliability of mobile agent-based systems (MABS), which are based on the conditions of the underlying computer network. In addition, we propose a third algorithm for generating a ... Keywords: Algorithms, Mobile agents, Monte Carlo simulation, Random walk, Reliability

Mosaab Daoud; Qusay H. Mahmoud

2008-01-01T23:59:59.000Z

86

Segregatory coordination and ellipsis in text generation  

Science Conference Proceedings (OSTI)

In this paper, we provide an account of how to generate sentences with coordination constructions from clause-sized semantic representations. An algorithm is developed and various examples from linguistic literature will be used to demonstrate that the ...

James Shaw

1998-08-01T23:59:59.000Z

87

Assignment #1: Developing Algorithms  

E-Print Network (OSTI)

The purpose of this assignment is to give you some experience developing algorithms. According to Wikipedia, an algorithm is “a finite list of well-defined instructions for accomplishing some task that, given an initial state, will terminate in a defined end-state ” [1]. 1. Consider the following initial state: • A bag containing sliced bread • A jar containing peanut butter • A jar containing jelly • A plastic knife Develop an algorithm for producing, as an end-state, a peanut butter and jelly sandwich. Be as precise as possible when developing your list of instructions. 2 Hand-In Instructions The assignment is due at the start of class on August 27 th. You are required to turn in a typed document. The document should include your name, your username, the date, the course number, and the assignment number. For example:

Andrew R. Dalton; Andy Dalton (adalton

2007-01-01T23:59:59.000Z

88

Lower Sioux Wind Feasibility & Development  

SciTech Connect

This report describes the process and findings of a Wind Energy Feasibility Study (Study) conducted by the Lower Sioux Indian Community (Community). The Community is evaluating the development of a wind energy project located on tribal land. The project scope was to analyze the critical issues in determining advantages and disadvantages of wind development within the Community. This analysis addresses both of the Community's wind energy development objectives: the single turbine project and the Commerical-scale multiple turbine project. The main tasks of the feasibility study are: land use and contraint analysis; wind resource evaluation; utility interconnection analysis; and project structure and economics.

Minkel, Darin

2012-04-01T23:59:59.000Z

89

Automated generation of kinetic chemical mechanisms using rewriting  

Science Conference Proceedings (OSTI)

Several software systems have been developed recently for the automated generation of combustion reactions kinetic mechanisms using different representations of species and reactions and different generation algorithms. In parallel, several software ...

Olivier Bournez; Guy-Marie Côme; Valérie Conraud; Hélène Kirchner; Liliana Ib?nescu

2003-06-01T23:59:59.000Z

90

Decision-Support Software for Grid Operators: Transmission Topology Control for Infrastructure Resilience to the Integration of Renewable Generation  

SciTech Connect

GENI Project: The CRA team is developing control technology to help grid operators more actively manage power flows and integrate renewables by optimally turning on and off entire power lines in coordination with traditional control of generation and load resources. The control technology being developed would provide grid operators with tools to help manage transmission congestion by identifying the facilities whose on/off status must change to lower generation costs, increase utilization of renewable resources and improve system reliability. The technology is based on fast optimization algorithms for the near to real-time change in the on/off status of transmission facilities and their software implementation.

2012-03-16T23:59:59.000Z

91

Generation of energy  

SciTech Connect

A method of generating energy which comprises utilizing relatively lower temperature available heat to effect partial distillation of at least portion of a multicomponent working fluid stream at an intermediate pressure to generate working fluid fractions of differing compositions. The fractions are used to produce at least one main rich solution which is relatively enriched with respect to the lower boiling component, and to produce at least one lean solution which is relatively improverished with respect to the lower boiling component. The pressure of the main rich solution is increased whereafter it is evaporated to produce a charged gaseous main working fluid. The main working fluid is expanded to a low pressure level to release energy. The spent low pressure level working fluid is condensed in a main absorption stage by dissolving with cooling in the lean solution to regenerate an initial working fluid for reuse.

Kalina, A. I.

1984-12-25T23:59:59.000Z

92

Generation of energy  

DOE Patents (OSTI)

A method of generating energy which comprises utilizing relatively lower temperature available heat to effect partial distillation of at least portion of a multicomponent working fluid stream at an intermediate pressure to generate working fluid fractions of differing compositions. The fractions are used to produce at least one main rich solution which is relatively enriched with respect to the lower boiling component, and to produce at least one lean solution which is relatively improverished with respect to the lower boiling component. The pressure of the main rich solution is increased whereafter it is evaporated to produce a charged gaseous main working fluid. The main working fluid is expanded to a low pressure level to release energy. The spent low pressure level working fluid is condensed in a main absorption stage by dissolving with cooling in the lean solution to regenerate an initial working fluid for reuse.

Kalina, Alexander I. (12214 Clear Fork, Houston, TX 77077)

1984-01-01T23:59:59.000Z

93

Source codes as random number generators  

E-Print Network (OSTI)

Abstract—A random number generator generates fair coin flips by processing deterministically an arbitrary source of nonideal randomness. An optimal random number generator generates asymptotically fair coin flips from a stationary ergodic source at a rate of bits per source symbol equal to the entropy rate of the source. Since optimal noiseless data compression codes produce incompressible outputs, it is natural to investigate their capabilities as optimal random number generators. In this paper we show under general conditions that optimal variable-length source codes asymptotically achieve optimal variable-length random bit generation in a rather strong sense. In particular, we show in what sense the Lempel–Ziv algorithm can be considered an optimal universal random bit generator from arbitrary stationary ergodic random sources with unknown distributions. Index Terms — Data compression, entropy, Lempel–Ziv algorithm, random number generation, universal source coding.

Karthik Visweswariah; Student Member; Sanjeev R. Kulkarni; Senior Member; Sergio Verdú

1998-01-01T23:59:59.000Z

94

Online energy generation scheduling for microgrids with intermittent energy sources and co-generation  

Science Conference Proceedings (OSTI)

Microgrids represent an emerging paradigm of future electric power systems that can utilize both distributed and centralized generations. Two recent trends in microgrids are the integration of local renewable energy sources (such as wind farms) and the ... Keywords: combined heat and power generation, energy generation scheduling, microgrids, online algorithm

Lian Lu; Jinlong Tu; Chi-Kin Chau; Minghua Chen; Xiaojun Lin

2013-06-01T23:59:59.000Z

95

Generating Multivariate Nonnormal Distribution Random Numbers Based on Copula Function  

E-Print Network (OSTI)

Abstract. Random numbers of multivariate nonnormal distribution are strongly requested by the area of theoretic research and application in practice. A new algorithm of generating multivariate nonnormal distribution random numbers is given based on the Copula function, and theoretic analysis suggests that the algorithm is suitable to be feasible. Furthermore, simulation shows that the empirical distribution which is formed by random numbers generating from the proposed algorithm can well approach the original distribution.

Xiaoping Hu; Jianmin He; Hongsheng Ly

2006-01-01T23:59:59.000Z

96

Genetic algorithms and artificial life  

Science Conference Proceedings (OSTI)

Genetic algorithms are computational models of evolution that play a central role in many artificial-life models. We review the history and current scope of research on genetic algorithms in artificial life, giving illustrative examples in which the ...

Melanie Mitchell; Stephanie Forrest

1994-01-01T23:59:59.000Z

97

Optimization Online - ALGORITHM & DOCUMENTATION: MINRES ...  

E-Print Network (OSTI)

Jan 12, 2013 ... ALGORITHM & DOCUMENTATION: MINRES-QLP for Singular Symmetric and Hermitian Linear Equations and Least-Squares Problems.

98

Algorithm Shootout: R versus RHMC  

E-Print Network (OSTI)

We present initial results comparing the RHMC and R algorithms on large lattices with small quark masses using chiral fermions. We also present results concerning staggered fermions near the deconfinement/chiral phase transition. We find that the RHMC algorithm not only eliminates the step-size error of the R algorithm, but is also considerably more efficient. We discuss several possibilities for further improvement to the RHMC algorithm.

M. A. Clark; Ph. de Forcrand; A. D. Kennedy

2005-09-30T23:59:59.000Z

99

Order acceptance using genetic algorithms  

Science Conference Proceedings (OSTI)

This paper uses a genetic algorithm to solve the order-acceptance problem with tardiness penalties. We compare the performance of a myopic heuristic and a genetic algorithm, both of which do job acceptance and sequencing, using an upper bound based on ... Keywords: Genetic algorithms, Order acceptance, Scheduling

Walter O. Rom; Susan A. Slotnick

2009-06-01T23:59:59.000Z

100

A penalized fuzzy clustering algorithm  

Science Conference Proceedings (OSTI)

In this paper, we propose a penalized inter-cluster separation (PICS) fuzzy clustering algorithm by adding a penalty term to the inter-cluster separation (ICS) algorithm. Numerical comparisons are made for several fuzzy clustering algorithms according ... Keywords: fuzzy c-means (FCM), fuzzy clustering, image segmentation, inter-cluster separation (ICS), magnetic resonance image (MRI), penalized ICS

Miin-Shen Yang; Wen-Liang Hung; Chia-Hsuan Chang

2006-12-01T23:59:59.000Z

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


101

Errors in graph embedding algorithms  

Science Conference Proceedings (OSTI)

One major area of difficulty in developing an algorithm for embedding a graph on a surface is handling bridges which have more than one possible placement. This paper addresses a number of published algorithms where this has not been handled correctly. ... Keywords: Algorithm, Graph embedding, Graph genus, Torus

Wendy Myrvold; William Kocay

2011-03-01T23:59:59.000Z

102

Fast Conversion Algorithms for Orthogonal Polynomials - Computer ...  

E-Print Network (OSTI)

Nov 13, 2008 ... a known conversion algorithm from an arbitrary orthogonal basis to the ... Fast algorithms, transposed algorithms, basis conversion, orthogonal.

103

A Next Generation Alarm Processing Algorithm Incorporating Recommendations and Decisions  

E-Print Network (OSTI)

, Fellow IEEE Abstract-- The number of alarms for a typical power system event may be overwhelming to power. Index Terms-- alarm processing, power system control, reac- tive power control, sensors, switched capacitors, transformer tap changing, wide area control systems, wide area measurement systems. I

104

Algorithms for Next-Generation High-Throughput Sequencing Technologies  

E-Print Network (OSTI)

Batzoglou, “Whole- genome sequencing and assembly with high-this promise of whole genome sequencing to fruition, severalcerevisiae whole-genome sequencing dataset, we discover that

Kao, Wei-Chun

2011-01-01T23:59:59.000Z

105

Algorithms for Gene Clustering Analysis on Genomes  

E-Print Network (OSTI)

The increased availability of data in biological databases provides many opportunities for understanding biological processes through these data. As recent attention has shifted from sequence analysis to higher-level analysis of genes across multiple genomes, there is a need to develop efficient algorithms for these large-scale applications that can help us understand the functions of genes. The overall objective of my research was to develop improved methods which can automatically assign groups of functionally related genes in large-scale data sets by applying new gene clustering algorithms. Proposed gene clustering algorithms that can help us understand gene function and genome evolution include new algorithms for protein family classification, a window-based strategy for gene clustering on chromosomes, and an exhaustive strategy that allows all clusters of small size to be enumerated. I investigate the problems of gene clustering in multiple genomes, and define gene clustering problems using mathematical methodology and solve the problems by developing efficient and effective algorithms. For protein family classification, I developed two supervised classification algorithms that can assign proteins to existing protein families in public databases and, by taking into account similarities between the unclassified proteins, allows for progressive construction of new families from proteins that cannot be assigned. This approach is useful for rapid assignment of protein sequences from genome sequencing projects to protein families. A comparative analysis of the method to other previously developed methods shows that the algorithm has a higher accuracy rate and lower mis-classification rate when compared to algorithms that are based on the use of multiple sequence alignments and hidden Markov models. The proposed algorithm performs well even on families with very few proteins and on families with low sequence similarity. Apart from the analysis of individual sequences, identifying genomic regions that descended from a common ancestor helps us study gene function and genome evolution. In distantly related genomes, clusters of homologous gene pairs serve as evidence used in function prediction, operon detection, etc. Thus, reliable identification of gene clusters is critical to functional annotation and analysis of genes. I developed an efficient gene clustering algorithm that can be applied on hundreds of genomes at the same time. This approach allows for large-scale study of evolutionary relationships of gene clusters and study of operon formation and destruction. By placing a stricter limit on the maximum cluster size, I developed another algorithm that uses a different formulation based on constraining the overall size of a cluster and statistical estimates that allow direct comparisons of clusters of different size. A comparative analysis of proposed algorithms shows that more biological insight can be obtained by analyzing gene clusters across hundreds of genomes, which can help us understand operon occurrences, gene orientations and gene rearrangements.

Yi, Gang Man

2011-05-01T23:59:59.000Z

106

The quadratic minimum spanning tree problem: A lower bounding procedure and an efficient search algorithm  

Science Conference Proceedings (OSTI)

In this paper we consider the quadratic minimum spanning tree problem (QMSTP) which is known to be NP-hard. Given a complete graph, the QMSTP consists of finding a minimum spanning tree (MST) where interaction costs between pairs of edges are prescribed. ... Keywords: Lagrangian relaxation, Local search, Quadratic minimum spanning tree problem

Temel Öncan; Abraham P. Punnen

2010-10-01T23:59:59.000Z

107

Controllable procedural map generation via multiobjective evolution  

Science Conference Proceedings (OSTI)

This paper shows how multiobjective evolutionary algorithms can be used to procedurally generate complete and playable maps for real-time strategy (RTS) games. We devise heuristic objective functions that measure properties of maps that impact important ... Keywords: Evolutionary computation, Multiobjective optimisation, Procedural content generation, RTS, Real-time strategy games, StarCraft

Julian Togelius; Mike Preuss; Nicola Beume; Simon Wessing; Johan Hagelbäck; Georgios N. Yannakakis; Corrado Grappiolo

2013-06-01T23:59:59.000Z

108

Nonlinear regression model generation using hyperparameter optimization  

Science Conference Proceedings (OSTI)

An algorithm of the inductive model generation and model selection is proposed to solve the problem of automatic construction of regression models. A regression model is an admissible superposition of smooth functions given by experts. Coherent Bayesian ... Keywords: Coherent Bayesian inference, Hyperparameters, Model generation, Model selection, Regression

Vadim Strijov; Gerhard Wilhelm Weber

2010-08-01T23:59:59.000Z

109

Distributed Generation  

NLE Websites -- All DOE Office Websites (Extended Search)

with another option to reduce peak load, relieve transmission congestion, and improve power reliability. Backup generation is widely deployed across the United States. Carnegie...

110

SunShot Initiative: Lowering Barriers  

NLE Websites -- All DOE Office Websites (Extended Search)

Lowering Barriers to someone by Lowering Barriers to someone by E-mail Share SunShot Initiative: Lowering Barriers on Facebook Tweet about SunShot Initiative: Lowering Barriers on Twitter Bookmark SunShot Initiative: Lowering Barriers on Google Bookmark SunShot Initiative: Lowering Barriers on Delicious Rank SunShot Initiative: Lowering Barriers on Digg Find More places to share SunShot Initiative: Lowering Barriers on AddThis.com... Concentrating Solar Power Photovoltaics Systems Integration Balance of Systems Reducing Non-Hardware Costs Lowering Barriers Fostering Growth Lowering Barriers DOE is working to improve solar market conditions in order to create green jobs and increase the availability of clean, renewable energy for Americans. Efforts to promote favorable policies and encourage easier

111

Algorithmic information theory  

E-Print Network (OSTI)

We introduce algorithmic information theory, also known as the theory of Kolmogorov complexity. We explain the main concepts of this quantitative approach to defining `information'. We discuss the extent to which Kolmogorov's and Shannon's information theory have a common purpose, and where they are fundamentally different. We indicate how recent developments within the theory allow one to formally distinguish between `structural' (meaningful) and `random' information as measured by the Kolmogorov structure function, which leads to a mathematical formalization of Occam's razor in inductive inference. We end by discussing some of the philosophical implications of the theory.

Grunwald, Peter D

2008-01-01T23:59:59.000Z

112

Study of Proposed Internet Congestion Control Algorithms*  

Science Conference Proceedings (OSTI)

... Algorithms* Kevin L. Mills, NIST (joint ... Page 2. Study of Proposed Internet Congestion Control Algorithms – Mills et al. Innovations ...

2013-04-01T23:59:59.000Z

113

Quantum Algorithm for Computing the Period Lattice of an Infrastructure  

E-Print Network (OSTI)

We present a quantum algorithm for computing the period lattice of infrastructures of fixed dimension. The algorithm applies to infrastructures that satisfy certain conditions. The latter are always fulfilled for infrastructures obtained from global fields, i.e., algebraic number fields and function fields with finite constant fields, as described in [Fon11]. The first of our main contributions is a rigorous and complete proof that the running time of the algorithm is polynomial in the logarithm of the determinant of the period lattice and exponential in the dimension n. The second main contribution is the determination of an explicit lower bound on the success probability of our algorithm which improves on the bounds given in the works of Hallgren and Schmidt and Vollmer. The exponential scaling seems inevitable because the best currently known methods for carrying out fundamental arithmetic operations in infrastructures obtained from algebraic number fields take exponential time. In contrast, the problem of...

Fontein, Felix

2011-01-01T23:59:59.000Z

114

RFCM: A Hybrid Clustering Algorithm Using Rough and Fuzzy Sets  

Science Conference Proceedings (OSTI)

A hybrid unsupervised learning algorithm, termed as rough-fuzzy c-means, is proposed in this paper. It comprises a judicious integration of the principles of rough sets and fuzzy sets. While the concept of lower and upper approximations of rough sets ... Keywords: Pattern recognition, clustering, data mining, fuzzy c-means, rough sets

Pradipta Maji; Sankar K. Pal

2007-12-01T23:59:59.000Z

115

GATS 1.0: a novel GA-based scheduling algorithm for task scheduling on heterogeneous processor nets  

Science Conference Proceedings (OSTI)

We present a novel GA-based scheduling algorithm for heterogeneous processor networks that succeeds in generating task schedules with completion times that are 7% and 10.1% shorter than those produced by two of the best existing scheduling algorithms ... Keywords: genetic algorithm, heterogeneous systems, parallel processing, scheduling

Mohammad Daoud; Nawwaf Kharma

2005-06-01T23:59:59.000Z

116

Distributed Generation and Resilience in Power Grids  

E-Print Network (OSTI)

We study the effects of the allocation of distributed generation on the resilience of power grids. We find that an unconstrained allocation and growth of the distributed generation can drive a power grid beyond its design parameters. In order to overcome such a problem, we propose a topological algorithm derived from the field of Complex Networks to allocate distributed generation sources in an existing power grid.

Scala, Antonio; Chessa, Alessandro; Caldarelli, Guido; Damiano, Alfonso

2012-01-01T23:59:59.000Z

117

Lower bound techniques for data structures  

E-Print Network (OSTI)

We describe new techniques for proving lower bounds on data-structure problems, with the following broad consequences: * the first [omega](lg n) lower bound for any dynamic problem, improving on a bound that had been ...

P?tra?cu, Mihai

2008-01-01T23:59:59.000Z

118

US eggs now lower in cholesterol  

Science Conference Proceedings (OSTI)

According to new nutrition data from the US Department of Agriculture’s Agricultural Research Service (USDA-ARS), eggs are lower in cholesterol than previously believed. US eggs now lower in cholesterol Inform Magazine Inform Archives Health Nutrition

119

EIA lowers forecast for summer gasoline prices  

Annual Energy Outlook 2012 (EIA)

EIA lowers forecast for summer gasoline prices U.S. gasoline prices are expected to be lower this summer than previously thought. The price for regular gasoline this summer is now...

120

Classification of Tropical Precipitating Systems Using Wind Profiler Spectral Moments. Part I: Algorithm Description and Validation  

Science Conference Proceedings (OSTI)

The lower atmospheric wind profiler (LAWP) measurements made at Gadanki, India, have been used to develop an objective algorithm to classify the tropical precipitating systems. A detailed investigation on the existing classification scheme ...

T. Narayana Rao; N. V. P. Kirankumar; B. Radhakrishna; D. Narayana Rao; K. Nakamura

2008-06-01T23:59:59.000Z

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


121

Multisensor data fusion algorithm development  

Science Conference Proceedings (OSTI)

This report presents a two-year LDRD research effort into multisensor data fusion. We approached the problem by addressing the available types of data, preprocessing that data, and developing fusion algorithms using that data. The report reflects these three distinct areas. First, the possible data sets for fusion are identified. Second, automated registration techniques for imagery data are analyzed. Third, two fusion techniques are presented. The first fusion algorithm is based on the two-dimensional discrete wavelet transform. Using test images, the wavelet algorithm is compared against intensity modulation and intensity-hue-saturation image fusion algorithms that are available in commercial software. The wavelet approach outperforms the other two fusion techniques by preserving spectral/spatial information more precisely. The wavelet fusion algorithm was also applied to Landsat Thematic Mapper and SPOT panchromatic imagery data. The second algorithm is based on a linear-regression technique. We analyzed the technique using the same Landsat and SPOT data.

Yocky, D.A.; Chadwick, M.D.; Goudy, S.P.; Johnson, D.K.

1995-12-01T23:59:59.000Z

122

Winter Energy Savings from Lower Thermostat Settings  

Reports and Publications (EIA)

This discussion provides details on the effect of lowering thermostat settings during the winter heating months of 1997.

Information Center

2000-12-12T23:59:59.000Z

123

Monitoring and Commissioning Verification Algorithms for CHP Systems  

Science Conference Proceedings (OSTI)

This document provides the algorithms for CHP system performance monitoring and commissioning verification (CxV). It starts by presenting system-level and component-level performance metrics, followed by descriptions of algorithms for performance monitoring and commissioning verification, using the metric presented earlier. Verification of commissioning is accomplished essentially by comparing actual measured performance to benchmarks for performance provided by the system integrator and/or component manufacturers. The results of these comparisons are then automatically interpreted to provide conclusions regarding whether the CHP system and its components have been properly commissioned and where problems are found, guidance is provided for corrections. A discussion of uncertainty handling is then provided, which is followed by a description of how simulations models can be used to generate data for testing the algorithms. A model is described for simulating a CHP system consisting of a micro-turbine, an exhaust-gas heat recovery unit that produces hot water, a absorption chiller and a cooling tower. The process for using this model for generating data for testing the algorithms for a selected set of faults is described. The next section applies the algorithms developed to CHP laboratory and field data to illustrate their use. The report then concludes with a discussion of the need for laboratory testing of the algorithms on a physical CHP systems and identification of the recommended next steps.

Brambley, Michael R.; Katipamula, Srinivas; Jiang, Wei

2008-03-31T23:59:59.000Z

124

Thermoacoustic magnetohydrodynamic electrical generator  

DOE Patents (OSTI)

A thermoacoustic magnetohydrodynamic electrical generator includes an intrinsically irreversible thermoacoustic heat engine coupled to a magnetohydrodynamic electrical generator. The heat engine includes an electrically conductive liquid metal as the working fluid and includes two heat exchange and thermoacoustic structure assemblies which drive the liquid in a push-pull arrangement to cause the liquid metal to oscillate at a resonant acoustic frequency on the order of 1000 Hz. The engine is positioned in the field of a magnet and is oriented such that the liquid metal oscillates in a direction orthogonal to the field of the magnet, whereby an alternating electrical potential is generated in the liquid metal. Low-loss, low-inductance electrical conductors electrically connected to opposite sides of the liquid metal conduct an output signal to a transformer adapted to convert the low-voltage, high-current output signal to a more usable higher voltage, lower current signal.

Wheatley, J.C.; Swift, G.W.; Migliori, A.

1984-11-16T23:59:59.000Z

125

AN ENGINE OIL LIFE ALGORITHM.  

E-Print Network (OSTI)

??An oil-life algorithm to calculate the remaining percentage of oil life is presented as a means to determine the right time to change the oil… (more)

Bommareddi, Anveshan

2009-01-01T23:59:59.000Z

126

Dictionary Design Algorithms for Vector Map Compression  

E-Print Network (OSTI)

TThe enormous size of vector maps and limited storage available in hand-held devices... The cluster centroids obtained becomes our dictionary. Based on this dictionary, we encode the vector dataset that we obtained earlier. Since each vector would now be assigned to a particular cluster, that vector would now be represented in terms of a reference to that cluster's centroid entry in the dictionary. We formally show that this proposed dictionary construction approach often yields a lower error of approximation than the error from conventional fixed dictionary techniques. Experimental results with a road map representing the major US Highways confirm the superiority of the proposed method in yielding lower errors of approximations for a fixed size dictionary [1]. In our future work we would like to experiment on different differential vector schemes. The general purpose clustering algorithm aims at minimizing the total square error. When a user tolerant accuracy level for each road segment is specified, the clustering algorithm needs to be modified to meet this requirement.

Shashi Shekhar; Yan Huang; Judy Djugash

2002-01-01T23:59:59.000Z

127

A new evolutionary algorithm for non-linear economic dispatch  

Science Conference Proceedings (OSTI)

Reduce fossil fuel resources; increasing established new power generation unit costs; and ever growing demand for electric energy necessitate optimal economic dispatch (ED) in today's electric power systems. Modern heuristic optimization techniques have ... Keywords: Chaotic Modified Shuffled Frog Leaping Algorithm, Economic dispatch, Nonlinear optimization

Taher Niknam; Bahman Bahmani Firouzi; Hasan Doagou Mojarrad

2011-09-01T23:59:59.000Z

128

Automatic discovery of algorithms for multi-agent systems  

Science Conference Proceedings (OSTI)

Automatic algorithm generation for large-scale distributed systems is one of the holy grails of artificial intelligence and agent-based modeling. It has direct applicability in future engineered (embedded) systems, such as mesh networks of sensors and ... Keywords: genetic programming

Sjors van Berkel; Daniel Turi; Andrei Pruteanu; Stefan Dulman

2012-07-01T23:59:59.000Z

129

Evaluating learning algorithms and classifiers  

Science Conference Proceedings (OSTI)

We analyse 18 evaluation methods for learning algorithms and classifiers, and show how to categorise these methods with the help of an evaluation method taxonomy based on several criteria. We also define a formal framework that make it possible to describe ... Keywords: classification, classifiers, evaluation methods, learning algorithms, supervised learning, taxonomy

Niklas Lavesson; Paul Davidsson

2007-04-01T23:59:59.000Z

130

FINANCIAL FORECASTING USING GENETIC ALGORITHMS  

E-Print Network (OSTI)

predecessors to forecast stock prices and manage portfolios for approximately 3 years.) We examineFINANCIAL FORECASTING USING GENETIC ALGORITHMS SAM MAHFOUD and GANESH MANI LBS Capital Management entitled Genetic Algorithms for Inductive Learning). Time-series forecasting is a special type

Boetticher, Gary D.

131

GENERATING CAPACITY  

E-Print Network (OSTI)

Evidence from the U.S. and some other countries indicates that organized wholesale markets for electrical energy and operating reserves do not provide adequate incentives to stimulate the proper quantity or mix of generating capacity consistent with mandatory reliability criteria. A large part of the problem can be associated with the failure of wholesale spot market prices for energy and operating reserves to rise to high enough levels during periods when generating capacity is fully utilized. Reforms to wholesale energy markets, the introduction of well-design forward capacity markets, and symmetrical treatment of demand response and generating capacity resources to respond to market and institutional imperfections are discussed. This policy reform program is compatible with improving the efficiency of spot wholesale electricity markets, the continued evolution of competitive retail markets, and restores incentives for efficient investment in generating capacity consistent with operating reliability criteria applied by system operators. It also responds to investment disincentives that have been associated with volatility in wholesale energy prices, limited hedging opportunities and to concerns about regulatory opportunism. 1

Paul L. Joskow; Paul L. Joskow; Paul L. Joskow

2006-01-01T23:59:59.000Z

132

NETL: News Release - More Electricity, Lower Emissions from Lignite Plants  

NLE Websites -- All DOE Office Websites (Extended Search)

25, 2004 25, 2004 More Electricity, Lower Emissions from Lignite Plants Are Goals of New Clean Coal Project Fuel Enhancement System Expected to Boost Generating Capacities WASHINGTON, DC - Secretary of Energy Spencer Abraham today announced the testing of the Lignite Fuel Enhancement System, a new process that could dramatically reduce air emissions from certain coal-based power plants while boosting overall generating capacity. The project, conducted by Great River Energy, is expected to boost the generating capacity and efficiency of power plants that burn high-moisture lignite coal, thereby reducing air pollutants and greenhouse gases. The new technology uses waste heat to dry nearly a quarter of the moisture in the coal before it is fed into the power plant boiler.

133

An Algorithm to Estimate the Heating Budget from Vertical Hydrometeor Profiles  

Science Conference Proceedings (OSTI)

A simple algorithm to estimate the latent heating of cloud systems from their vertical hydrometer profiles is proposed. The derivation as well as the validation of the algorithm is based on output generated by a non-hydrostatic cloud model with ...

Wei-Kuo Tao; Joanne Simpson; Stephen Lang; Michael McCumber; Robert Adler; Richard Penc

1990-12-01T23:59:59.000Z

134

Local Interpolation-based Polar Format SAR: Algorithm, Hardware Implementation and Design Automation  

Science Conference Proceedings (OSTI)

In this paper we present a local interpolation-based variant of the well-known polar format algorithm used for synthetic aperture radar (SAR) image formation. We develop the algorithm to match the capabilities of the application-specific logic-in-memory ... Keywords: Chip generator, Logic in memory, Synthetic aperture radar

Qiuling Zhu; Christian R. Berger; Eric L. Turner; Larry Pileggi; Franz Franchetti

2013-06-01T23:59:59.000Z

135

SunShot Initiative: Lowering Barriers  

NLE Websites -- All DOE Office Websites (Extended Search)

Lowering Barriers DOE is working to improve solar market conditions in order to create green jobs and increase the availability of clean, renewable energy for Americans. Efforts to...

136

Jefferson Lab Science Series - Lowering the Boom!  

NLE Websites -- All DOE Office Websites (Extended Search)

with Earth) Science Series Video Archive Next Video (Environmental Impact of Global Burning) Environmental Impact of Global Burning Lowering the Boom Dr. Christine Darden -...

137

Generating exact D-optimal designs for polynomial models  

Science Conference Proceedings (OSTI)

This paper compares several optimization algorithms that can be used to generate exact D-optimal designs (i.e., designs for a specified number of runs) for any polynomial model. The merits and limitations of each algorithm are demonstrated on ... Keywords: general linear regression, mathematical optimization, optimal experimental design

Jacob E. Boon

2007-03-01T23:59:59.000Z

138

Evaluation of the GOES-R ABI LAP retrieval algorithm using the GOES-13 Sounder  

Science Conference Proceedings (OSTI)

A physical retrieval algorithm has been developed for deriving the legacy atmospheric profile (LAP) product from infrared radiances of the Advanced Baseline Imager (ABI) onboard the next generation Geostationary Operational Environmental Satellite ...

Yong-Keun Lee; Zhenglong Li; Jun Li; Timothy J. Schmit

139

Magnetocumulative generator  

DOE Patents (OSTI)

An improved magnetocumulative generator is described that is useful for producing magnetic fields of very high energy content over large spatial volumes. The polar directed pleated magnetocumulative generator has a housing providing a housing chamber with an electrically conducting surface. The chamber forms a coaxial system having a small radius portion and a large radius portion. When a magnetic field is injected into the chamber, from an external source, most of the magnetic flux associated therewith positions itself in the small radius portion. The propagation of an explosive detonation through high-explosive layers disposed adjacent to the housing causes a phased closure of the chamber which sweeps most of the magnetic flux into the large radius portion of the coaxial system. The energy content of the magnetic field is greatly increased by flux stretching as well as by flux compression. The energy enhanced magnetic field is utilized within the housing chamber itself.

Pettibone, J.S.; Wheeler, P.C.

1981-06-08T23:59:59.000Z

140

Cluster generator  

DOE Patents (OSTI)

Described herein is an apparatus and a method for producing atom clusters based on a gas discharge within a hollow cathode. The hollow cathode includes one or more walls. The one or more walls define a sputtering chamber within the hollow cathode and include a material to be sputtered. A hollow anode is positioned at an end of the sputtering chamber, and atom clusters are formed when a gas discharge is generated between the hollow anode and the hollow cathode.

Donchev, Todor I. (Urbana, IL); Petrov, Ivan G. (Champaign, IL)

2011-05-31T23:59:59.000Z

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


141

Thermoelectric generator  

DOE Patents (OSTI)

A thermoelectric generator having a rigid coupling or stack'' between the heat source and the hot strap joining the thermoelements is described. The stack includes a member of an insulating material, such as ceramic, for electrically isolating the thermoelements from the heat source, and a pair of members of a ductile material, such as gold, one each on each side of the insulating member, to absorb thermal differential expansion stresses in the stack. (Official Gazette)

Pryslak, N.E.

1974-02-26T23:59:59.000Z

142

Photon generator  

DOE Patents (OSTI)

A photon generator includes an electron gun for emitting an electron beam, a laser for emitting a laser beam, and an interaction ring wherein the laser beam repetitively collides with the electron beam for emitting a high energy photon beam therefrom in the exemplary form of x-rays. The interaction ring is a closed loop, sized and configured for circulating the electron beam with a period substantially equal to the period of the laser beam pulses for effecting repetitive collisions.

Srinivasan-Rao, Triveni (Shoreham, NY)

2002-01-01T23:59:59.000Z

143

PLASMA GENERATOR  

DOE Patents (OSTI)

This patent describes apparatus for producing an electricity neutral ionized gas discharge, termed a plasma, substantially free from contamination with neutral gas particles. The plasma generator of the present invention comprises a plasma chamber wherein gas introduced into the chamber is ionized by a radiofrequency source. A magnetic field is used to focus the plasma in line with an exit. This magnetic field cooperates with a differential pressure created across the exit to draw a uniform and uncontaminated plasma from the plasma chamber.

Foster, J.S. Jr.

1958-03-11T23:59:59.000Z

144

Column generation based heuristic for a helicopter routing problem  

Science Conference Proceedings (OSTI)

This work presents a column generation based heuristic algorithm for the problem of planning the flights of helicopters to attend transport requests among airports in the continent and offshore platforms on the Campos basin for the Brazilian State Oil ...

Lorenza Moreno; Marcus Poggi de Aragão; Eduardo Uchoa

2006-05-01T23:59:59.000Z

145

Natural algorithms and influence systems  

E-Print Network (OSTI)

doi:10.1145/2380656.2380679 Algorithms offer a rich, expressive language for modelers of biological and social systems. They lay the grounds for numerical simulations and, crucially, provide a powerful framework for their analysis. The new area of natural algorithms may reprise in the life sciences the role differential equations have long played in the physical sciences. For this to happen, however, an “algorithmic calculus ” is needed. We discuss what this program entails in the context of influence systems, a broad family of multiagent models arising in social dynamics. 1.

Bernard Chazelle

2012-01-01T23:59:59.000Z

146

The inversion algorithm for digital simulation  

Science Conference Proceedings (OSTI)

The inversion algorithm is an event-driven algorithm, whose performance rivals or exceeds that of levelized compiled code simulation, even at activity rates of 50% or more. The inversion algorithm has several unique features, the most remarkable of which ...

P. M. Maurer

2006-11-01T23:59:59.000Z

147

Hyperspectral detection algorithms: Use covariances or subspaces?  

E-Print Network (OSTI)

There are two broad classes of hyperspectral detection algorithms.1, 2 Algorithms in the first class use the spectral covariance matrix of the background clutter; in contrast, algorithms in the second class characterize ...

Manolakis, Dimitris G.

148

HEAT GENERATION  

DOE Patents (OSTI)

Heat is generated by the utilization of high energy neutrons produced as by nuclear reactions between hydrogen isotopes in a blanket zone containing lithium, a neutron moderator, and uranium and/or thorium effective to achieve multtplicatton of the high energy neutron. The rnultiplied and moderated neutrons produced react further with lithium-6 to produce tritium in the blanket. Thermal neutron fissionable materials are also produced and consumed in situ in the blanket zone. The heat produced by the aggregate of the various nuclear reactions is then withdrawn from the blanket zone to be used or otherwise disposed externally. (AEC)

Imhoff, D.H.; Harker, W.H.

1963-12-01T23:59:59.000Z

149

Machine-learning algorithm aims to accelerate materials discovery | Argonne  

NLE Websites -- All DOE Office Websites (Extended Search)

Science Science Computing, Environment & Life Sciences Energy Engineering & Systems Analysis Photon Sciences Physical Sciences & Engineering Energy Frontier Research Centers Science Highlights Postdoctoral Researchers Machine-learning algorithm aims to accelerate materials discovery July 16, 2013 Tweet EmailPrint A research team led by Argonne Leadership Computing Facility computational chemist Anatole von Lilienfeld is developing an algorithm that combines quantum chemistry with machine learning (artificial intelligence) to enable atomistic simulations that predict the properties of new materials with unprecedented speed. From innovations in medicine to novel materials for next-generation batteries, this approach could greatly accelerate the pace of materials discovery, with high-performance

150

Automatic Table Ground Truth Generation and a Background-Analysis-Based Table Structure Extraction  

E-Print Network (OSTI)

In this paper, we first describe an automatic table ground truth generation system which can efficiently generate a large amount of accurate table ground truth suitable for the development of table detection algorithms. Then a novel background-analysis-based, coarse-to-fine table identification algorithm and an X-Y cut table decomposition algorithm are described. We discuss an experimental protocol to evaluate the table detection algorithms. For a total of having vin table entities and a total cell entities, our table detection algorithm takes line, word segmentation results as input and obtains around cell correct detection rates.

Yalin Wang; Ihsin T. Phillips; Robert Haralick

2001-01-01T23:59:59.000Z

151

Some Abstract Pivot Algorithms (REVISED)  

E-Print Network (OSTI)

Several problems in the theory of combinatorial geometries (or matroids) are solved by means of algorithms which involve the notion of "abstract pivots". The main example is the Edmonds-Fulkerson partition theorem, which ...

Green, Curtis

152

Bayesian inference algorithm on Raw  

E-Print Network (OSTI)

This work explores the performance of Raw, a parallel hardware platform developed at MIT, running a Bayesian inference algorithm. Motivation for examining this parallel system is a growing interest in creating a self-learning ...

Luong, Alda

2004-01-01T23:59:59.000Z

153

A combinatorial algorithm for Pfaffians  

Science Conference Proceedings (OSTI)

The Pfaffian of a graph is closely linked to Perfect Matching. It is also naturally related to the determinant of an appropriately defined matrix. This relation between Pfaffian and determinant is usually exploited to give a fast algorithm for computing ...

Meena Mahajan; P. R. Subramanya; V. Vinay

1999-07-01T23:59:59.000Z

154

A polynomial projection algorithm for linear programming  

E-Print Network (OSTI)

Jul 5, 2013 ... Abstract: We propose a polynomial algorithm for linear programming. The algorithm represents a linear optimization or decision problem in the ...

155

The Speed of Shor's R-algorithm  

E-Print Network (OSTI)

May 8, 2007 ... Key words: Shor's r-algorithm, space dilation, linear convergence, uncon- ... Shor's r-algorithm is an iterative method for unconstrained opti-.

156

Storing syngas lowers the carbon price for profitable coal gasification  

SciTech Connect

Integrated gasification combined cycle (IGCC) electric power generation systems with carbon capture and sequestration have desirable environmental qualities but are not profitable when the carbon dioxide price is less than approximately $50 per metric ton. We examine whether an IGCC facility that operates its gasifier continuously but stores the syngas and produces electricity only when daily prices are high may be profitable at significantly lower CO{sub 2} prices. Using a probabilistic analysis, we have calculated the plant-level return on investment (ROI) and the value of syngas storage for IGCC facilities located in the U.S. Midwest using a range of storage configurations. Adding a second turbine to use the stored syngas to generate electricity at peak hours and implementing 12 h of above-ground high-pressure syngas storage significantly increases the ROI and net present value. Storage lowers the carbon price at which IGCC enters the U.S. generation mix by approximately 25%. 36 refs., 7 figs., 1 tab.

Adam Newcomer; Jay Apt [Carnegie Mellon University, Pittsburgh, PA (USA). Carnegie Mellon Electricity Industry Center

2007-12-15T23:59:59.000Z

157

Laser action by optically depumping lower states  

DOE Patents (OSTI)

A method and apparatus are described for obtaining laser action between an upper energy level and a lower energy level of a gaseous medium. The upper energy level is populated to some degree (short of achieving a conventional inverted population) by any suitable pumping means, and an inverted population is established by transiently and selectively depumping the lower energy level. The depumping may be done by exposing the medium to an intense source of radiation which selectively causes the transformation of the lower energy level species to some other energy level. Thus, a thermally pumped/optically depumped gas laser system is produced.

Krupke, W.F.

1975-11-26T23:59:59.000Z

158

Magnetocumulative generator  

DOE Patents (OSTI)

An improved magnetocumulative generator is described that is useful for producing magnetic fields of very high energy content over large spatial volumes. The polar directed pleated magnetocumulative generator has a housing (100, 101, 102, 103, 104, 105) providing a housing chamber (106) with an electrically conducting surface. The chamber (106) forms a coaxial system having a small radius portion and a large radius portion. When a magnetic field is injected into the chamber (106), from an external source, most of the magnetic flux associated therewith positions itself in the small radius portion. The propagation of an explosive detonation through high-explosive layers (107, 108) disposed adjacent to the housing causes a phased closure of the chamber (106) which sweeps most of the magnetic flux into the large radius portion of the coaxial system. The energy content of the magnetic field is greatly increased by flux stretching as well as by flux compression. The energy enhanced magnetic field is utilized within the housing chamber itself.

Pettibone, Joseph S. (Livermore, CA); Wheeler, Paul C. (Livermore, CA)

1983-01-01T23:59:59.000Z

159

Multithreaded Algorithms for Graph Coloring  

SciTech Connect

Graph algorithms are challenging to parallelize when high performance and scalability are primary goals. Low concurrency, poor data locality, irregular access pattern, and high data access to computation ratio are among the chief reasons for the challenge. The performance implication of these features is exasperated on distributed memory machines. More success is being achieved on shared-memory, multi-core architectures supporting multithreading. We consider a prototypical graph problem, coloring, and show how a greedy algorithm for solving it can be e*ectively parallelized on multithreaded architectures. We present in particular two di*erent parallel algorithms. The first relies on speculation and iteration, and is suitable for any shared-memory, multithreaded system. The second uses data ow principles and is targeted at the massively multithreaded Cray XMT system. We benchmark the algorithms on three di*erent platforms and demonstrate scalable runtime performance. In terms of quality of solution, both algorithms use nearly the same number of colors as the serial algorithm.

Catalyurek, Umit V.; Feo, John T.; Gebremedhin, Assefaw H.; Halappanavar, Mahantesh; Pothen, Alex

2012-10-21T23:59:59.000Z

160

Designing Educationally Effective Algorithm Visualizations  

E-Print Network (OSTI)

Despite the intuitively compelling adage "a picture is worth a thousand words," attempts over the past decade to use animations to explain algorithms to students have produced disappointing results. In most cases interesting algorithm animations were designed, but no formal, systematic evaluations were conducted. When such evaluations were performed the results were mixed, with compelling evidence for the instructional superiority of algorithm animations failing to emerge. It is in this context that we embarked on a research program to develop educationally effective algorithm visualizations. This program was based on the premise that animations needed to be embedded in a knowledge and context providing hypermedia environment in order to effectively harness their power to enhance learning. This paper describes the architecture of the resulting Hypermedia Algorithm Visualization system HalVis. Four empirical studies with HalVis are described, which demonstrated that the extent of learning exhibited by students who used HalVis was significantly greater than that of students who used means of traditional instruction or a typical algorithm animation.

Steven Hansen; N. Hari Narayanan; Mary Hegarty

2002-01-01T23:59:59.000Z

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


161

A rule-based approach for automated generation of kinetic chemical mechanisms  

Science Conference Proceedings (OSTI)

Several software systems have been developed recently for the automated generation of combustion reactions kinetic mechanisms using different representations of species and reactions and different generation algorithms. In parallel, several software ...

Olivier Bournez; Guy-Marie Côme; Valérie Conraud; Hélène Kirchner; Liliana Ib?nescu

2003-06-01T23:59:59.000Z

162

Generating random graphs with large girth  

Science Conference Proceedings (OSTI)

We present a simple and efficient algorithm for randomly generating simple graphs without small cycles. These graphs can be used to design high performance Low-Density Parity-Check (LDPC) codes. For any constant k, ? ? 1/2k(k ...

Mohsen Bayati; Andrea Montanari; Amin Saberi

2009-01-01T23:59:59.000Z

163

Generalization of vapor pressure lowering effects in an existing geothermal simulator  

DOE Green Energy (OSTI)

Thermodynamic properties of pore water are shown to be different from those of bulk water because of interfacial forces between the aqueous and solid phases. This {open_quotes}vapor-pressure lowering{close_quotes} (VPL) effect is described through Kelvin`s equation, which relates VPL to properties of the liquid phase. An algorithm that accounts for VPL had previously been implented in the geothermal simulator TETRAD. This algorithm applies to a narrow range of reservoir properties, and in some cases leads in inconsistencies. This report presents a generalization of the VPL algorithm which removes many of its limitations. The governing equations for the generalization are presented, assumptions and limitations of the method are discussed, and the modifications are validated.

Shook, G.M.

1993-06-01T23:59:59.000Z

164

Lower Saccharide Nanometric Materials and Methods  

DOE Patents (OSTI)

A ceramic composition having at least one nanometric ceramic powder, at least one lower saccharide, and water. The composition is useful in many industrial applications, including preparation of stronger and substantially defect free green and sintered ceramic bodies.

Schilling, Christopher H.; Tomasik, Piotr; Sikora, Marek

2004-07-13T23:59:59.000Z

165

Lower Flathead System Fisheries Study, 1985 Annual Report.  

DOE Green Energy (OSTI)

Existing aquatic habitat in the lower Flathead River and its tributaries was assessed for its relationship to the present size, distribution, and maintenance of all salmonid species, northern pike, and largemouth bass populations. The objectives were to assess how and to what extent hydroelectric development and operation affects the quality and quantity of aquatic habitat in the lower Flathead River and its tributaries and life stages of existing trout, pike, and largemouth bass populations, evaluate the potential for increasing quality habitat, and thus game fish production, through mitigation, and develop an array of fisheries management options to mitigate the impacts of present hydroelectric operations, demonstrating under each management option how fish populations would benefit and hydroelectric generation capabilities would be modified.

Pajak, Paul; Bradshaw, William H.; DeSantos, Joseph M.; Darling, James E.

1986-01-01T23:59:59.000Z

166

MAAP5 Lower Plenum Model Status  

Science Conference Proceedings (OSTI)

This report describes the current physical models that are being used in the Modular Accident Analysis Program (MAAP) for predicting various phenomena in the lower plenum. MAAP is an EPRI-owned and -licensed computer program that simulates the operation of light water and heavy water moderated nuclear power plants for both current and advanced light water reactor (ALWR) designs.In the report, the physical models and the MAAP5 code structure for various phenomena in the lower plenum ...

2013-02-25T23:59:59.000Z

167

Biogass Generator  

NLE Websites -- All DOE Office Websites (Extended Search)

Another internet tool by: Another internet tool by: Build Your Own Page 1 of 5 Teach...build...learn...renewable energy! Biogas Generator A Renewable Energy Project Kit The Pembina Institute What Is Biogas? Biogas is actually a mixture of gases, usually carbon dioxide and methane. It is produced by a few kinds of microorganisms, usually when air or oxygen is absent. (The absence of oxygen is called "anaerobic conditions.") Animals that eat a lot of plant material, particularly grazing animals such as cattle, produce large amounts of biogas. The biogas is produced not by the cow or elephant, but by billions of microor- ganisms living in its digestive system. Biogas also develops in bogs and at the bottom of lakes, where decaying organic matter builds up under wet and

168

The message management asynchronous backtracking algorithm  

Science Conference Proceedings (OSTI)

In this paper we show how the asynchronous backtracking algorithm, a well-known distributed constraint satisfaction algorithm, produces unnecessary messages and introduce our optimized algorithm, message management asynchronous backtracking, which reduces ... Keywords: Backtracking algorithm, Constraint satisfaction problem, Distributed, Hyper-resolution, Multiagent system

Hong Jiang; Jose M. Vidal

2008-06-01T23:59:59.000Z

169

Combining Genetic Algorithms & Simulation to Search for ...  

Science Conference Proceedings (OSTI)

... GA Checkpoint Database Node Manager Job Manager GA Controller ... GENETIC ALGORITHM Principal Components Analysis, Clustering, … ...

2013-10-24T23:59:59.000Z

170

The powerrank web link analysis algorithm  

Science Conference Proceedings (OSTI)

The web graph follows the power law distribution and has a hierarchy structure. But neither the PageRank algorithm nor any of its improvements leverage these attributes. In this paper, we propose a novel link analysis algorithm "the PowerRank algorithm", ... Keywords: hierarchy structure, page rank algorithm, power distribution

Yizhou Lu; Benyu Zhang; Wensi Xi; Zheng Chen; Yi Liu; Michael R. Lyu; Wei-ying Ma

2004-05-01T23:59:59.000Z

171

A parallel descent algorithm for convex programming  

Science Conference Proceedings (OSTI)

Keywords: convex programming, decomposition, descent method, parallel algorithm, trust region method

Masao Fukushima; Mounir Haddou; Van Hien Nguyen; Jean-Jacques Strodiot; Takanobu Sugimoto; Eiki Yamakawa

1996-01-01T23:59:59.000Z

172

Formal verification of change making algorithms  

Science Conference Proceedings (OSTI)

We present progress on a project to formally verify properties of various algorithms related to the change making problem. In particular, we formalize proofs of the classic greedy algorithm's behavior as well as an algorithm to verify its optimality ... Keywords: Coq proof assistant, canonical coin system, change making, formal methods, greedy algorithm

Nadeem Abdul Hamid, Brook Bowers

2013-04-01T23:59:59.000Z

173

TO APPEAR IN J. VLSI AND SIGNAL PROCESSING (SPRINGER), SPECIAL ISSUE ON UWB 1 An Iterative Algorithm and Low Complexity  

E-Print Network (OSTI)

that our new algorithm operates at lower signal to noise ratio than earlier works using iterative message algorithm. Specifically, the redundant models can be combined together so that memory usage can be reduced of Electrical Engineering, Viterbi School of Engineering, University of Southern California, Los Angeles, CA

Southern California, University of

174

VLF heating of the lower ionosphere  

SciTech Connect

A controlled wave-injection experiment with a 28.5 kHz transmitter having a radiated power of 100 kW has revealed evidence of ionospheric heating by the VLF waves. Calculations indicate that the observed effect can be attributed to the absorption of wave energy in the lower ionosphere, which is estimated to result in a 30% enhancement in the collision frequency at 85 km. This process also represents a new means of direct coupling of lightning energy to the lower ionosphere.

Inan, U.S. (Stanford Univ., CA (USA))

1990-05-01T23:59:59.000Z

175

Performance Analysis of Enhanced Clustering Algorithm for Gene Expression Data  

E-Print Network (OSTI)

Microarrays are made it possible to simultaneously monitor the expression profiles of thousands of genes under various experimental conditions. It is used to identify the co-expressed genes in specific cells or tissues that are actively used to make proteins. This method is used to analysis the gene expression, an important task in bioinformatics research. Cluster analysis of gene expression data has proved to be a useful tool for identifying co-expressed genes, biologically relevant groupings of genes and samples. In this paper we applied K-Means with Automatic Generations of Merge Factor for ISODATA- AGMFI. Though AGMFI has been applied for clustering of Gene Expression Data, this proposed Enhanced Automatic Generations of Merge Factor for ISODATA- EAGMFI Algorithms overcome the drawbacks of AGMFI in terms of specifying the optimal number of clusters and initialization of good cluster centroids. Experimental results on Gene Expression Data show that the proposed EAGMFI algorithms could identify compact clus...

Chandrasekhar, T; Elayaraja, E

2011-01-01T23:59:59.000Z

176

Generating Probability Distributions using Multivalued Stochastic Relay Circuits  

E-Print Network (OSTI)

The problem of random number generation dates back to von Neumann's work in 1951. Since then, many algorithms have been developed for generating unbiased bits from complex correlated sources as well as for generating arbitrary distributions from unbiased bits. An equally interesting, but less studied aspect is the structural component of random number generation as opposed to the algorithmic aspect. That is, given a network structure imposed by nature or physical devices, how can we build networks that generate arbitrary probability distributions in an optimal way? In this paper, we study the generation of arbitrary probability distributions in multivalued relay circuits, a generalization in which relays can take on any of N states and the logical 'and' and 'or' are replaced with 'min' and 'max' respectively. Previous work was done on two-state relays. We generalize these results, describing a duality property and networks that generate arbitrary rational probability distributions. We prove that these network...

Lee, David

2011-01-01T23:59:59.000Z

177

Integration of renewable energy sources in smart grids by means of evolutionary optimization algorithms  

Science Conference Proceedings (OSTI)

Nowadays, modern power networks have to face a number of challenges such as growing electricity demand, aging utility infrastructure and not to forget the environmental impact of the greenhouse gases produced by conventional electric generation. In order ... Keywords: Distributed generation, FACTS devices, Genetic algorithm, Reactive power, Smart grids

Monica Alonso; Hortensia Amaris; Carlos Alvarez-Ortega

2012-04-01T23:59:59.000Z

178

Lower Snake River I | Open Energy Information  

Open Energy Info (EERE)

Lower Snake River I Lower Snake River I Jump to: navigation, search Name Lower Snake River I Facility Lower Snake River I Sector Wind energy Facility Type Commercial Scale Wind Facility Status In Service Owner Puget Sound Energy Developer Puget Sound Energy Energy Purchaser Puget Sound Energy Location South of Pomeroy and north of Pataha Creek in Garfield County Coordinates 46.375632°, -117.703257° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":46.375632,"lon":-117.703257,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

179

Comments of the Lower Colorado River Authority | Department of...  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Lower Colorado River Authority Comments of the Lower Colorado River Authority Comments of the Lower Colorado River Authority on Implementing the National Broadband Plan by Studying...

180

Validation of the Algorithms Developed for Preliminary Prediction of Daylight Distribution in a Toplighted Atrium  

E-Print Network (OSTI)

Empirically based preliminary prediction algorithms were recently developed for different atrium types under various diffuse sky conditions. In the case of toplighted atriums, these algorithms were developed to predict light levels on the horizontal floor and on the vertical wall surfaces of the atrium. However, the actual building atriums measured to assess these algorithms in a full-scale setting were four stories high or lower. This study presents an investigation of the validity of the developed algorithms using full-scale measurements in two four-sided toplighted atriums 11 and 14 stories high respectively. The measurements were made over several days in the two large atriums of the Anatole Hotel in Dallas, Texas. These data are compared with the algorithm predictions, and the usefulness of the prediction models is discussed.

Boubekri, M.; Atif, M. R.; Boyer, L. L.

1988-01-01T23:59:59.000Z

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


181

Security of jump controlled sequence generators for stream ciphers  

Science Conference Proceedings (OSTI)

The use of jump control technique provides efficient and secure ways for generating key-stream for stream ciphers. This design approach was recently implemented in some algorithms submitted to eSTREAM, the ECRYPT Stream Cipher Project. However, inappropriately ... Keywords: Pomaranch, cryptanalysis, jump register, key-stream generator, linear relations, stream cipher

Tor Helleseth; Cees J. A. Jansen; Shahram Khazaei; Alexander Kholosha

2006-09-01T23:59:59.000Z

182

Application of Artificial Intelligence Technique in Distributed Generation System  

Science Conference Proceedings (OSTI)

This paper gives a brief description of current situation of distributed generation system, and points out that microgrid can run in two kinds of operation modes. The key problems which need to be cautiously considered exist in each operation mode are ... Keywords: Artificial intelligence, Artificial neural network, Distributed generation system, Fuzzy logic, Genetic algorithm, Multi-agent system

Guoqing Weng; Youbing Zhang; Yi Hu

2009-05-01T23:59:59.000Z

183

Power System Operational and Planning Impacts of Generator Cycling Due to Increased Penetration of Variable Generation  

Science Conference Proceedings (OSTI)

This technical update describes work done in the second and final year of the EPRI Bulk Renewable Integration Program project, “Operational and Planning Impacts of Generator Cycling.” This project takes a system perspective in examining the issue of generator cycling behavior, which is likely to increase with increased renewable penetration. To better understand system impacts, researchers developed new modeling algorithms and used them in two case studies to investigate issues related ...

2013-12-22T23:59:59.000Z

184

Adaptive protection algorithm and system  

Science Conference Proceedings (OSTI)

An adaptive protection algorithm and system for protecting electrical distribution systems traces the flow of power through a distribution system, assigns a value (or rank) to each circuit breaker in the system and then determines the appropriate trip set points based on the assigned rank.

Hedrick, Paul (Pittsburgh, PA); Toms, Helen L. (Irwin, PA); Miller, Roger M. (Mars, PA)

2009-04-28T23:59:59.000Z

185

Data streams: algorithms and applications  

Science Conference Proceedings (OSTI)

In the data stream scenario, input arrives very rapidly and there is limited memory to store the input. Algorithms have to work with one or few passes over the data, space less than linear in the input size or time significantly less than the input size. ...

S. Muthukrishnan

2005-08-01T23:59:59.000Z

186

Experimental optimization by evolutionary algorithms  

Science Conference Proceedings (OSTI)

This tutorial addresses applications of evolutionary algorithms to optimization tasks where the function evaluation cannot be done through a computer simulation, but requires the execution of an experiment in the real world (i.e., cosmetics, detergents, ... Keywords: biological experiments, experimental optimization, history, quantum control

Thomas Bäck; Joshua Knowles; Ofer M. Shir

2010-07-01T23:59:59.000Z

187

Robust Algorithms for Object Localization  

Science Conference Proceedings (OSTI)

Model-based localization, the task of estimating an object‘s pose from sensed and corresponding model features, is a fundamental task in machine vision. Exact constant time localization algorithms have been developed for the case where the sensed ... Keywords: object localization, object registration, resultants

Aaron Wallack; Dinesh Manocha

1998-05-01T23:59:59.000Z

188

Downhole hydraulic seismic generator  

DOE Patents (OSTI)

A downhole hydraulic seismic generator system for transmitting energy wave vibrations into earth strata surrounding a borehole. The system contains an elongated, unitary housing operably connected to a well head aboveground by support and electrical cabling, and contains clamping apparatus for selectively clamping the housing to the walls of the borehole. The system further comprises a hydraulic oscillator containing a double-actuating piston whose movement is controlled by an electro-servovalve regulating a high pressure hydraulic fluid flow into and out of upper and lower chambers surrounding the piston. The spent hydraulic fluid from the hydraulic oscillator is stored and pumped back into the system to provide high pressure fluid for conducting another run at the same, or a different location within the borehole.

Gregory, Danny L. (Corrales, NM); Hardee, Harry C. (Albuquerque, NM); Smallwood, David O. (Albuquerque, NM)

1992-01-01T23:59:59.000Z

189

Downhole hydraulic seismic generator  

DOE Patents (OSTI)

A downhole hydraulic seismic generator system for transmitting energy wave vibrations into earth strata surrounding a borehole. The system contains an elongated, unitary housing operably connected to a well head aboveground by support and electrical cabling, and contains clamping apparatus for selectively clamping the housing to the walls of the borehole. The system further comprises a hydraulic oscillator containing a double-actuating piston whose movement is controlled by an electro-servovalve regulating a high pressure hydraulic fluid flow into and out of upper and lower chambers surrounding the piston. The spent hydraulic fluid from the hydraulic oscillator is stored and pumped back into the system to provide high pressure fluid for conducting another run at the same, or a different location within the borehole. 4 figs.

Gregory, D.L.; Hardee, H.C.; Smallwood, D.O.

1990-01-01T23:59:59.000Z

190

Downhole hydraulic seismic generator  

DOE Patents (OSTI)

A downhole hydraulic seismic generator system for transmitting energy wave vibrations into earth strata surrounding a borehole. The system contains an elongated, unitary housing operably connected to a well head aboveground by support and electrical cabling, and contains clamping apparatus for selectively clamping the housing to the walls of the borehole. The system further comprises a hydraulic oscillator containing a double-actuating piston whose movement is controlled by an electro-servovalve regulating a high pressure hydraulic fluid flow into and out of upper and lower chambers surrounding the piston. The spent hydraulic fluid from the hydraulic oscillator is stored and pumped back into the system to provide high pressure fluid for conducting another run at the same, or a different location within the borehole. 4 figs.

Gregory, D.L.; Hardee, H.C.; Smallwood, D.O.

1990-12-31T23:59:59.000Z

191

Efficient discrete-time simulations of continuous-time quantum query algorithms  

E-Print Network (OSTI)

The continuous-time query model is a variant of the discrete query model in which queries can be interleaved with known operations (called "driving operations") continuously in time. Interesting algorithms have been discovered in this model, such as an algorithm for evaluating nand trees more efficiently than any classical algorithm. Subsequent work has shown that there also exists an efficient algorithm for nand trees in the discrete query model; however, there is no efficient conversion known for continuous-time query algorithms for arbitrary problems. We show that any quantum algorithm in the continuous-time query model whose total query time is T can be simulated by a quantum algorithm in the discrete query model that makes O[T log(T) / log(log(T))] queries. This is the first upper bound that is independent of the driving operations (i.e., it holds even if the norm of the driving Hamiltonian is very large). A corollary is that any lower bound of T queries for a problem in the discrete-time query model immediately carries over to a lower bound of \\Omega[T log(log(T))/log (T)] in the continuous-time query model.

R. Cleve; D. Gottesman; M. Mosca; R. D. Somma; D. L. Yonge-Mallo

2008-11-26T23:59:59.000Z

192

Why is Boris Algorithm So Good?  

SciTech Connect

Due to its excellent long term accuracy, the Boris algorithm is the de facto standard for advancing a charged particle. Despite its popularity, up to now there has been no convincing explanation why the Boris algorithm has this advantageous feature. In this letter, we provide an answer to this question. We show that the Boris algorithm conserves phase space volume, even though it is not symplectic. The global bound on energy error typically associated with symplectic algorithms still holds for the Boris algorithm, making it an effective algorithm for the multi-scale dynamics of plasmas.

et al, Hong Qin

2013-03-03T23:59:59.000Z

193

Hydraulic turbine governing system identification using T-S fuzzy model optimized by chaotic gravitational search algorithm  

Science Conference Proceedings (OSTI)

Hydraulic turbine governing system (HTGS) is a complicated nonlinear system that controls the frequency and power output of hydroelectric generating unit (HGU). The modeling of HTGS is an important and difficult task, because some components, like hydraulic ... Keywords: Chaotic gravitational search algorithm, Fuzzy c-regression model, Heuristic algorithms, Hydraulic turbine governing system, System identification, Takagi-Sugeno model

Chaoshun Li, Jianzhong Zhou, Jian Xiao, Han Xiao

2013-10-01T23:59:59.000Z

194

On Shear-Generated Gravity Waves that Reach the Mesosphere. Part I: Wave Generation  

Science Conference Proceedings (OSTI)

A long unresolved issue in nonorographic gravity wave generation is whether there is significant emission from Kelvin–Helmholtz (KH) shear instability in the lower stratosphere, for instance, just above tropopause jets. Such emission has often ...

Oliver Bühler; Michael E. McIntyre; John F. Scinocca

1999-11-01T23:59:59.000Z

195

Performance of Observation-Based Prediction Algorithms for Very Short-Range, Probabilistic Clear-Sky Condition Forecasting  

Science Conference Proceedings (OSTI)

Very short-range sky condition forecasts are produced to support a variety of military, civil, and commercial activities. In this investigation, six advanced, observation (obs)-based prediction algorithms were developed and tested that generated ...

Timothy J. Hall; Carl N. Mutchler; Greg J. Bloy; Rachel N. Thessin; Stephanie K. Gaffney; Jonathan J. Lareau

2011-01-01T23:59:59.000Z

196

Aerosol Retrievals from Individual AVHRR Channels. Part I: Retrieval Algorithm and Transition from Dave to 6S Radiative Transfer Model  

Science Conference Proceedings (OSTI)

The present second-generation aerosol retrieval algorithm over oceans used at NOAA/National Environmental Satellite, Data, and Information Service (NESDIS) separately retrieves two values of aerosol optical depth, ?1 and ?2, from Advanced Very ...

Alexander Ignatov; Larry Stowe

2002-02-01T23:59:59.000Z

197

A review of procedures to evolve quantum algorithms  

Science Conference Proceedings (OSTI)

There exist quantum algorithms that are more efficient than their classical counterparts; such algorithms were invented by Shor in 1994 and then Grover in 1996. A lack of invention since Grover's algorithm has been commonly attributed to the non-intuitive ... Keywords: Evolutionary algorithms, Evolving quantum algorithms, Genetic algorithms, Genetic programming, Quantum algorithms, Quantum computing

Adrian Gepp; Phil Stocks

2009-06-01T23:59:59.000Z

198

Fun with sub-linear time algorithms  

Science Conference Proceedings (OSTI)

Provided that one is willing to use randomness and to tolerate an approximate answer, many computational problems admit ultrafast algorithms that run in less than linear time in the length of the input. In many interesting cases, even algorithms that ...

Luca Trevisan

2007-06-01T23:59:59.000Z

199

The WSR-88D Rainfall Algorithm  

Science Conference Proceedings (OSTI)

A detailed description of the operational WSR-88D rainfall estimation algorithm is presented. This algorithm, called the Precipitation Processing System, produces radar-derived rainfall products in real time for forecasters in support of the ...

Richard A. Fulton; Jay P. Breidenbach; Dong-Jun Seo; Dennis A. Miller; Timothy O’Bannon

1998-06-01T23:59:59.000Z

200

The bidimensionality theory and its algorithmic applications  

E-Print Network (OSTI)

Our newly developing theory of bidimensional graph problems provides general techniques for designing efficient fixed-parameter algorithms and approximation algorithms for NP- hard graph problems in broad classes of graphs. ...

Hajiaghayi, MohammadTaghi

2005-01-01T23:59:59.000Z

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


201

Advanced Encryption Standard Algorithm Validation List  

Science Conference Proceedings (OSTI)

Advanced Encryption Standard Algorithm Validation List. Last Update: 8/28/2013. The page provides technical information ...

202

An algorithm for minimization of quantum cost  

E-Print Network (OSTI)

A new algorithm for minimization of quantum cost of quantum circuits has been designed. The quantum cost of different quantum circuits of particular interest (eg. circuits for EPR, quantum teleportation, shor code and different quantum arithmetic operations) are computed by using the proposed algorithm. The quantum costs obtained using the proposed algorithm is compared with the existing results and it is found that the algorithm has produced minimum quantum cost in all cases.

Anindita Banerjee; Anirban Pathak

2009-10-12T23:59:59.000Z

203

Raising and lowering operators, factorization and differential/difference operators of hypergeometric type  

E-Print Network (OSTI)

Starting from Rodrigues formula we present a general construction of raising and lowering operators for orthogonal polynomials of continuous and discrete variable on uniform lattice. In order to have these operators mutually adjoint we introduce orthonormal functions with respect to the scalar product of unit weight. Using the Infeld-Hull factorization method, we generate from the raising and lowering operators the second order self-adjoint differential/difference operator of hypergeometric type.

M. Lorente

2004-01-14T23:59:59.000Z

204

Lowering Power using the Voltage Identification Bit  

E-Print Network (OSTI)

Voltage identification is a form of adaptive voltage scaling (AVS). The voltage-identification technique described in this application note enables certain devices in the Virtex®-7 family to be operated at a lower voltage of 0.9V while delivering the same specified performance as that of a device operating at the nominal supply voltage of 1.0V. Voltage identification capable devices consume approximately 30 % lower worst case (maximum) static power and correspondingly dissipate less heat. Reduced power consumption is a desirable characteristic and one that Xilinx 7 series FPGAs fulfill in multiple ways. The primary purpose of the voltage-identification technique is to reduce the worst-case power consumption of-1C devices. However, the significance of the voltage-identification technique goes beyond an individual device dissipating less energy, it also can lower the overall system cost. Power supplies and thermal management requirements are normally specified based on the worst-case power demands of all the system’s components. Although the 7 series FPGAs-1C devices are the most cost-effective, the total cost of a product is the sum of all parts, and costs associated with the power supply and thermal management can be significant. The voltage-identification technique specifically reduces worst-case power consumption, which reduces the overall costs associated with specifying a larger power supply, requiring a heat sink, adding forced air cooling, or including similar devices. This application note shows the technical aspects of implementing the voltage-identification technique and introduces a reference design for the VC707 evaluation kit. It also explains how voltage identification fits into the complete power portfolio of Virtex-7 FPGAs and highlights the benefits of using the voltage-identification technique to reduce power consumption and system costs.

Ken Chapman; Jameel Hussein

2012-01-01T23:59:59.000Z

205

Pulverizer performance upgrades lower fuel costs  

Science Conference Proceedings (OSTI)

Between 2002 and 2005, combustion equipment modifications were carried out at St. Johns River Power Plant in Jacksonville, FL. The effort succeeded in obtaining the desired emission reductions and to increase petroleum coke consumption. Since 2005 the boilers typically fired a blend of 70% Colombia coal and 30% delayed petroleum coke. To realize significant fuel savings, the pulverizer capacity was increased by 14% to allow a lower grade coal to be used. The article describes the changes made to the pulverizer to allow 11,800 Btu/pound coal to be burnt, with annual savings of $6.3 m beginning in 2006. 4 figs., 1 tab.

Hansen, T.

2007-05-15T23:59:59.000Z

206

On extremal cases of Hopcroft's algorithm  

Science Conference Proceedings (OSTI)

In this paper we consider the problem of minimization of deterministic finite automata (DFA) with reference to Hopcroft's algorithm. Hopcroft's algorithm has several degrees of freedom, so there can exist different executions that can lead to different ... Keywords: Deterministic finite state automata, Hopcroft's minimization algorithm, Standard trees, Word trees

G. Castiglione; A. Restivo; M. Sciortino

2010-08-01T23:59:59.000Z

207

Optimizing genetic algorithm for motif discovery  

Science Conference Proceedings (OSTI)

Planted (l,d)-motif identification is an important and challenging problem in computational biology. In this paper, we present an original algorithm (GARPS) that combines Genetic Algorithm (GA) and Random Projection Strategy (RPS) to identify (l,d)-motifs. ... Keywords: (l,d)-motif, Genetic algorithm, Motif identification, Position-weighted function, Random projection

Hongwei Huo; Zhenhua Zhao; Vojislav Stojkovic; Lifang Liu

2010-12-01T23:59:59.000Z

208

Opposition-based artificial bee colony algorithm  

Science Conference Proceedings (OSTI)

The Artificial Bee Colony (ABC) algorithm is a relatively new algorithm for function optimization. The algorithm is inspired by the foraging behavior of honey bees. In this work, the performance of ABC is enhanced by introducing the concept of opposition-based ... Keywords: benchmarking, black-box optimization, opposition-based learning, swarm intelligence

Mohammed El-Abd

2011-07-01T23:59:59.000Z

209

Applying Adaptive Evolutionary Algorithms to Hard Problems  

E-Print Network (OSTI)

Applying Adaptive Evolutionary Algorithms to Hard Problems J.I. van Hemert1 jvhemert into two distinct parts. The main theme is adaptive evolutionary algorithms. The rst part covers. The second part mainly consists of the development of a library. Its use is aimed at evolutionary algorithms

Emmerich, Michael

210

A genetic algorithm based method for docking flexible molecules  

SciTech Connect

The authors describe a computational method for docking flexible molecules into protein binding sites. The method uses a genetic algorithm (GA) to search the combined conformation/orientation space of the molecule to find low energy conformation. Several techniques are described that increase the efficiency of the basic search method. These include the use of several interacting GA subpopulations or niches; the use of a growing algorithm that initially docks only a small part of the molecule; and the use of gradient minimization during the search. To illustrate the method, they dock Cbz-GlyP-Leu-Leu (ZGLL) into thermolysin. This system was chosen because a well refined crystal structure is available and because another docking method had previously been tested on this system. Their method is able to find conformations that lie physically close to and in some cases lower in energy than the crystal conformation in reasonable periods of time on readily available hardware.

Judson, R.S. [Sandia National Labs., Livermore, CA (United States); Jaeger, E.P.; Treasurywala, A.M. [Sterling-Winthrop Inc., Collegeville, PA (United States)

1993-11-01T23:59:59.000Z

211

Lower crude oil prices to help push down gasoline pricesLower...  

U.S. Energy Information Administration (EIA) Indexed Site

down from the average 3.63 a gallon U.S. drivers paid in 2012. Expected lower crude oil prices, which account for about two-thirds of the cost of gasoline, will help push...

212

A pencil beam algorithm for helium ion beam therapy  

Science Conference Proceedings (OSTI)

Purpose: To develop a flexible pencil beam algorithm for helium ion beam therapy. Dose distributions were calculated using the newly developed pencil beam algorithm and validated using Monte Carlo (MC) methods. Methods: The algorithm was based on the established theory of fluence weighted elemental pencil beam (PB) kernels. Using a new real-time splitting approach, a minimization routine selects the optimal shape for each sub-beam. Dose depositions along the beam path were determined using a look-up table (LUT). Data for LUT generation were derived from MC simulations in water using GATE 6.1. For materials other than water, dose depositions were calculated by the algorithm using water-equivalent depth scaling. Lateral beam spreading caused by multiple scattering has been accounted for by implementing a non-local scattering formula developed by Gottschalk. A new nuclear correction was modelled using a Voigt function and implemented by a LUT approach. Validation simulations have been performed using a phantom filled with homogeneous materials or heterogeneous slabs of up to 3 cm. The beams were incident perpendicular to the phantoms surface with initial particle energies ranging from 50 to 250 MeV/A with a total number of 10{sup 7} ions per beam. For comparison a special evaluation software was developed calculating the gamma indices for dose distributions. Results: In homogeneous phantoms, maximum range deviations between PB and MC of less than 1.1% and differences in the width of the distal energy falloff of the Bragg-Peak from 80% to 20% of less than 0.1 mm were found. Heterogeneous phantoms using layered slabs satisfied a {gamma}-index criterion of 2%/2mm of the local value except for some single voxels. For more complex phantoms using laterally arranged bone-air slabs, the {gamma}-index criterion was exceeded in some areas giving a maximum {gamma}-index of 1.75 and 4.9% of the voxels showed {gamma}-index values larger than one. The calculation precision of the presented algorithm was considered to be sufficient for clinical practice. Although only data for helium beams was presented, the performance of the pencil beam algorithm for proton beams was comparable. Conclusions: The pencil beam algorithm developed for helium ions presents a suitable tool for dose calculations. Its calculation speed was evaluated to be similar to other published pencil beam algorithms. The flexible design allows easy customization of measured depth-dose distributions and use of varying beam profiles, thus making it a promising candidate for integration into future treatment planning systems. Current work in progress deals with RBE effects of helium ions to complete the model.

Fuchs, Hermann; Stroebele, Julia; Schreiner, Thomas; Hirtl, Albert; Georg, Dietmar [Christian Doppler Laboratory for Medical Radiation Research for Radiation Oncology, Medical University of Vienna, 1090 Vienna (Austria); Department of Radiation Oncology, Medical University of Vienna/AKH Vienna, 1090 Vienna (Austria) and Comprehensive Cancer Center, Medical University of Vienna/AKH Vienna, 1090 Vienna (Austria); Department of Radiation Oncology, Medical University of Vienna/AKH Vienna (Austria) and Comprehensive Cancer Center, Medical University of Vienna/AKH Vienna, 1090 Vienna (Austria); PEG MedAustron, 2700 Wiener Neustadt (Austria); Department of Nuclear Medicine, Medical University of Vienna, 1090 Vienna (Austria); Christian Doppler Laboratory for Medical Radiation Research for Radiation Oncology, Medical University of Vienna, 1090 Vienna (Austria); Department of Radiation Oncology, Medical University of Vienna/AKH Vienna, 1090 Vienna (Austria) and Comprehensive Cancer Center, Medical University of Vienna/AKH Vienna, 1090 Vienna (Austria)

2012-11-15T23:59:59.000Z

213

Algorithms for Large-Scale Internet Measurements  

E-Print Network (OSTI)

As the Internet has grown in size and importance to society, it has become increasingly difficult to generate global metrics of interest that can be used to verify proposed algorithms or monitor performance. This dissertation tackles the problem by proposing several novel algorithms designed to perform Internet-wide measurements using existing or inexpensive resources. We initially address distance estimation in the Internet, which is used by many distributed applications. We propose a new end-to-end measurement framework called Turbo King (T-King) that uses the existing DNS infrastructure and, when compared to its predecessor King, obtains delay samples without bias in the presence of distant authoritative servers and forwarders, consumes half the bandwidth, and reduces the impact on caches at remote servers by several orders of magnitude. Motivated by recent interest in the literature and our need to find remote DNS nameservers, we next address Internet-wide service discovery by developing IRLscanner, whose main design objectives have been to maximize politeness at remote networks, allow scanning rates that achieve coverage of the Internet in minutes/hours (rather than weeks/months), and significantly reduce administrator complaints. Using IRLscanner and 24-hour scan durations, we perform 20 Internet-wide experiments using 6 different protocols (i.e., DNS, HTTP, SMTP, EPMAP, ICMP and UDP ECHO). We analyze the feedback generated and suggest novel approaches for reducing the amount of blowback during similar studies, which should enable researchers to collect valuable experimental data in the future with significantly fewer hurdles. We finally turn our attention to Intrusion Detection Systems (IDS), which are often tasked with detecting scans and preventing them; however, it is currently unknown how likely an IDS is to detect a given Internet-wide scan pattern and whether there exist sufficiently fast stealth techniques that can remain virtually undetectable at large-scale. To address these questions, we propose a novel model for the windowexpiration rules of popular IDS tools (i.e., Snort and Bro), derive the probability that existing scan patterns (i.e., uniform and sequential) are detected by each of these tools, and prove the existence of stealth-optimal patterns.

Leonard, Derek Anthony

2010-12-01T23:59:59.000Z

214

Lower Bounds on U_{e3}  

E-Print Network (OSTI)

We give minimal values for the lepton mixing parameter |U_{e3}|, starting from an initially vanishing value and applying 2-loop renormalization group equations. We consider a unique situation in which 1-loop running does not generate non-zero |U_{e3}|. This occurs when the neutrino mass hierarchy is inverted with the lowest neutrino mass being zero. In this scenario, after 2-loop running, the order of magnitude of |U_{e3}| lies between 10^{-12} and 10^{-14}. Such small values may be of interest in supernova physics. Corresponding limits for the normal mass ordering are several orders of magnitude larger.

Ray, Shamayita; Schmidt, Michael A

2010-01-01T23:59:59.000Z

215

Lower Cost CPV 3-Sun Mirror Modules  

SciTech Connect

In a series of patent applications filed between 2002 and 2005, JX Crystals Inc described a evolutionary lower-cost low-concentration planar solar photovoltaic module that uses multiple linear rows of silicon cells and standard one-sun circuit laminations incorporating glass and EVA weather proofing encapsulations. The three novel features that we described are interdependent and integrated together to yield lower cost PV modules. These 3 novel features are: (1) The use of rows of linear mirrors or linear Fresnel lenses aligned with the cell rows and concentrating the sunlight onto the cell rows. (2) The addition of a thin aluminum sheet heat spreader on the back of the circuit lamination to spread the heat away from the cell rows so that the cell operating temperature remains acceptably low. (3) The incorporation of slots in the back of the aluminum sheet heat spreader to accommodate the differences in thermal expansion between the silicon cells, the glass, and the aluminum so that the circuit interconnectivity is maintained over time. Various embodiments of this planar linear concentrator panel are shown in figures 1 to 5. Figures 1 and 2 show the original planar linear concentrator module concept from July of 2002 with either mirrors (figure 1) or linear Fresnel lenses (figure 2). The idea was expanded in 2003 with the idea of an aluminum sheet heat spreader added to the back of a standard PV circuit lamination as shown in figure 3. In 2003, we also transitioned from half cells to third cells using SunPower cells as shown in figure 4. JX Crystals Inc then received funding for the 3-sun PV mirror module concept from the Shanghai Science and Technology Commission in 2003 and from the Shanghai Flower Port and the Shanghai Import and Export Trading Company in 2005. This funding led to a 800 panel pilot production run of our JX Crystals designed 3-sun module in 2006. 672 of these panels were installed in a 100 kW demonstration and an additional 24 panels were installed in a second 4 kW demonstration both at the Flower Port in Shanghai. Both of these systems were completed in 2006. Our 3-sun PV Panel concept has been described previously (see references 1, 2, & 3 available at www.jxcrystals.com under publication tab). We are now interested in bringing this potentially lower cost 3-sun technology back to the US. For any new technology, three issues need to be addressed. They are performance, durability, and cost. These topics are addressed in the next 3 sections.

Fraas, Dr. Lewis [JX Crystals, Inc.; Avery, James E. [JX Crystals, Inc.; Minkin, Leonid M [ORNL; Huang, H, [JX Crystals, Inc.; Gehl, Anthony C [ORNL; Maxey, L Curt [ORNL

2007-01-01T23:59:59.000Z

216

Global structual optimizations of surface systems with a genetic algorithm  

SciTech Connect

Global structural optimizations with a genetic algorithm were performed for atomic cluster and surface systems including aluminum atomic clusters, Si magic clusters on the Si(111) 7 x 7 surface, silicon high-index surfaces, and Ag-induced Si(111) reconstructions. First, the global structural optimizations of neutral aluminum clusters Al{sub n} (n up to 23) were performed using a genetic algorithm coupled with a tight-binding potential. Second, a genetic algorithm in combination with tight-binding and first-principles calculations were performed to study the structures of magic clusters on the Si(111) 7 x 7 surface. Extensive calculations show that the magic cluster observed in scanning tunneling microscopy (STM) experiments consist of eight Si atoms. Simulated STM images of the Si magic cluster exhibit a ring-like feature similar to STM experiments. Third, a genetic algorithm coupled with a highly optimized empirical potential were used to determine the lowest energy structure of high-index semiconductor surfaces. The lowest energy structures of Si(105) and Si(114) were determined successfully. The results of Si(105) and Si(114) are reported within the framework of highly optimized empirical potential and first-principles calculations. Finally, a genetic algorithm coupled with Si and Ag tight-binding potentials were used to search for Ag-induced Si(111) reconstructions at various Ag and Si coverages. The optimized structural models of {radical}3 x {radical}3, 3 x 1, and 5 x 2 phases were reported using first-principles calculations. A novel model is found to have lower surface energy than the proposed double-honeycomb chained (DHC) model both for Au/Si(111) 5 x 2 and Ag/Si(111) 5 x 2 systems.

Chuang, Feng-Chuan

2005-05-01T23:59:59.000Z

217

Eye-Safe Diode-Laser-Based Micropulse Differential Absorption Lidar (DIAL) for Water Vapor Profiling in the Lower Troposphere  

Science Conference Proceedings (OSTI)

A second-generation diode-laser-based master oscillator power amplifier (MOPA) configured micropulse differential absorption lidar (DIAL) instrument for profiling of lower-tropospheric water vapor is presented. The DIAL transmitter is based on a ...

Amin R. Nehrir; Kevin S. Repasky; John L. Carlsten

2011-02-01T23:59:59.000Z

218

I Lower Yakima Valley Wetlands and Riparian  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

I I Lower Yakima Valley Wetlands and Riparian - Restoration Project \ , Final Environmental Assessment DOENo. 0941 c Bonneville Power kdmi.nistration, Yakama Indian Nation, Bureawof Indian Affairs % J e;r%mBlYTlON OF THIS DOCUMENT IS UNLIMITED DISCLAIMER This report was .prepared as a n account of work sponsored by an agency of t h e United States Government. Neither t h e United States Government nor any agency thereof, nor any of their employees, make any warranty, express or implied, or assumes a n y legal liability or responsibility for t h e accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial

219

Lower Cost, Higher Performance Carbon Fiber  

NLE Websites -- All DOE Office Websites (Extended Search)

David (Dave) Warren David (Dave) Warren Field Technical Manager Transportation Materials Research Oak Ridge National Laboratory P.O. Box 2009, M/S 8050 Oak Ridge, Tennessee 37831-8050 Phone: 865-574-9693 Fax: 865-574-0740 Email: WarrenCD@ORNL.GOV Lower Cost, Higher Performance Carbon Fiber 14 February 2011 2 Managed by UT-Battelle for the U.S. Department of Energy Presentation_name Questions for Today Materials How can the cost of carbon fiber suitable for higher performance applications (H 2 Storage) be developed? H 2 Storage requirements implies Aerospace grade fibers. Can we build off of work previously done for more modest structural applications? To accurately answer: We need to know the minimum performance and maximum cost requirements of the fiber not simply the properties of current fiber.

220

Lower Valley Energy Inc | Open Energy Information  

Open Energy Info (EERE)

Jump to: navigation, search Jump to: navigation, search Name Lower Valley Energy Inc Place Idaho Utility Id 11273 References Energy Information Administration.[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Utility Rate Schedules Grid-background.png C-1 Small Commercial Commercial C-2 Large Power Service Commercial I-1 Small Irrigation Service Commercial I-2 Large Irrigation Service Commercial I-3 Small Irrigation Optional Commercial L-1 Street and Yard Light Service-100W Sodium Vapor Lighting L-1 Street and Yard Light Service-175W Sodium Vapor Lighting L-1 Street and Yard Light Service-200W Sodium Vapor Lighting L-1 Street and Yard Light Service-250W Sodium Vapor Lighting L-1 Street and Yard Light Service-400W Sodium Vapor Lighting

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221

Vapor-pressure lowering in geothermal systems  

SciTech Connect

The water vapor-pressure lowering phenomenon in porous media was investigated for a range of temperatures by measuring vapor pressure vs. mass of water adsorbed in consolidated sandstone cores and unconsolidated silica sands. Experimental results showed that the mass of water adsorbed on the rock surface is much more than the amount of pore steam. Results also revealed that the water adsorption is caused mainly by micropores in the porous medium. Measurement of the mass of methane and ethane adsorbed on dry rocks showed that the amount of adsorption is not great in comparison with the pore gas. It was found that adsorption data for water/sandstone core studies could be normalized with respect to temperature. Although this appears not to have been reported previously, it does agree in principle with findings for solid powders with micropores. Another interesting result was that reanalysis of previous studies of capillarity in sandstones indicates that experimental data probably were influenced mostly by adsorption.

Hsieh, C.H.; Ramey, H.J. Jr.

1983-02-01T23:59:59.000Z

222

Light water reactor lower head failure analysis  

SciTech Connect

This document presents the results from a US Nuclear Regulatory Commission-sponsored research program to investigate the mode and timing of vessel lower head failure. Major objectives of the analysis were to identify plausible failure mechanisms and to develop a method for determining which failure mode would occur first in different light water reactor designs and accident conditions. Failure mechanisms, such as tube ejection, tube rupture, global vessel failure, and localized vessel creep rupture, were studied. Newly developed models and existing models were applied to predict which failure mechanism would occur first in various severe accident scenarios. So that a broader range of conditions could be considered simultaneously, calculations relied heavily on models with closed-form or simplified numerical solution techniques. Finite element techniques-were employed for analytical model verification and examining more detailed phenomena. High-temperature creep and tensile data were obtained for predicting vessel and penetration structural response.

Rempe, J.L.; Chavez, S.A.; Thinnes, G.L. [EG and G Idaho, Inc., Idaho Falls, ID (United States)] [and others

1993-10-01T23:59:59.000Z

223

Dynamic Algorithm for Space Weather Forecasting System  

E-Print Network (OSTI)

We propose to develop a dynamic algorithm that intelligently analyzes existing solar weather data and constructs an increasingly more accurate equation/algorithm for predicting solar weather accurately in real time. This dynamic algorithm analyzes a wealth of data derived from scientific research and provides increasingly accurate solar forecasts. As the database of information grows over time, this algorithm perfects itself and reduces forecast uncertainties. This will provide a vastly more effective way of processing existing data for practical use in the public and private sectors. Specifically, we created an algorithm that stores data from several sources in a way that is useable, we created the ?dynamic algorithm? used for creating accurate/effective forecasts, and we have performed preliminary benchmarks on this algorithm. The preliminary benchmarks yield surprisingly effective results thus far?forecasts have been made 8-16 hours into the future with significant magnitude and trend accuracy, which is a vast improvement over current methods employed.

Fischer, Luke D.

2010-05-01T23:59:59.000Z

224

A tabu search algorithm for the split delivery vehicle routing problem  

E-Print Network (OSTI)

We consider the Split Delivery Vehicle Routing Problem (SDVRP) where a fleet of homogeneous vehicles has to serve a set of customers. Each customer can be visited more than once, contrary to what is usually assumed in the classical Vehicle Routing Problem (VRP) and the demand of each customer can be greater than the capacity of the vehicles. No constraint on the number of available vehicles is considered. There is a single depot for the vehicles and each vehicle has to start and end its tour at the depot. The objective is to find a set of vehicle routes that serve all the customers such that the sum of the quantity delivered in each tour does not exceed the capacity of the vehicles and the total distance travelled is minimized. The SDVRP has been introduced in the literature only few years ago by Dror and Trudeau (see [4] and [5]) who have considered the case where the demand of each customer is lower than the capacity of the vehicles. They have analyzed the savings generated by allowing split deliveries in a vehicle routing problem and they have presented a heuristic algorithm for the problem. They have also shown that when the distances satisfy the triangle inequality there exists an optimal solution for the SDVRP where no pair of tours have more than one customer in common. We study here the case where the capacity of the vehicles, as well as the demand of each

Claudia Archetti; Alain Hertz; M. Grazia Speranza

2005-01-01T23:59:59.000Z

225

Next Generation Radioisotope Generators | Department of Energy  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

» Next Generation Radioisotope Generators » Next Generation Radioisotope Generators Next Generation Radioisotope Generators Advanced Stirling Radioisotope Generator (ASRG) - The ASRG is currently being developed as a high-efficiency RPS technology to support future space missions on the Martian surface or in the vacuum of space. This system uses Stirling convertors, which have moving parts to mechanically convert heat to electricity. This power conversion system, if successfully deployed, will reduce the weight of each RPS and the amount of Pu-238 needed per mission. A HISTORY OF MISSION SUCCESSES For over fifty years, the Department of Energy has enabled space exploration on 27 missions by providing safe reliable radioistope power systems and radioisotope heater units for NASA, Navy and Air Force.

226

The development of new algorithms for remote sensing of snow ...  

Science Conference Proceedings (OSTI)

Mar 14, 2010 ... remote sensing algorithm development, calibration and validation in ... Keywords Remote sensing Á Retrieval algorithms Á. Fractional snow ...

227

Concept for an Algorithm Testing and Evaluation Program at ...  

Science Conference Proceedings (OSTI)

... the same data sets using the ATS's reference algorithms. ... The geometric fitting reference algorithms are incorporated within the ATS. ...

2012-10-09T23:59:59.000Z

228

Dual-speed wind turbine generation  

SciTech Connect

Induction generator has been used since the early development of utility-scale wind turbine generation. An induction generator is the generator of choice because of its ruggedness and low cost. With an induction generator, the operating speed of the wind turbine is limited to a narrow range (almost constant speed). Dual- speed operation can be accomplished by using an induction generator with two different sets of winding configurations or by using a dual output drive train to drive two induction generators with two different rated speeds. With single-speed operation, the wind turbine operates at different power coefficients (Cp) as the wind speed varies. Operation at maximum Cp can occur only at a single wind speed. However, if the wind speed.varies across a wider range, the operating Cp will vary significantly. Dual-speed operation has the advantage of enabling the wind turbine to operate at near maximum Cp over a wider range of wind speeds. Thus, annual energy production can be increased. The dual-speed mode may generate less energy than a variable-speed mode; nevertheless, it offers an alternative which captures more energy than single-speed operation. In this paper, dual-speed operation of a wind turbine is investigated. Annual energy production is compared between single-speed and dual-speed operation. One type of control algorithm for dual-speed operation is proposed. Some results from a dynamic simulation will be presented to show how the control algorithm works as the wind turbine is exposed to varying wind speeds.

Muljadi, E.; Butterfield, C.P. [National Renewable Energy Lab., Golden, CO (United States); Handman, D. [Flowind Corp., San Rafael, CA (United States)

1996-10-01T23:59:59.000Z

229

The Finescale Response of Lowered ADCP Velocity Profiles  

Science Conference Proceedings (OSTI)

Lowered acoustic Doppler current profiler (LADCP) velocity profiles are compared with simultaneous higher-resolution expendable current profiler (XCP) profiles to determine the lowered ADCP's response at short wavelengths. Although lowered ADCP ...

Kurt Polzin; Eric Kunze; Jules Hummon; Eric Firing

2002-02-01T23:59:59.000Z

230

Cultural Relations of the Gila River and Lower Colorado Tribes  

E-Print Network (OSTI)

OF THE GILA RIVER AND LOWER COLORADO TRIBES Included in theGila River and Lower Colorado Tribes" by Professor Leslieof the Yumans on the Lower Colorado, but that the Pima, at

Gifford, Edward Winslow

1936-01-01T23:59:59.000Z

231

Generating Cosmological Gaussian Random Fields  

E-Print Network (OSTI)

We present a generic algorithm for generating Gaussian random initial conditions for cosmological simulations on periodic rectangular lattices. We show that imposing periodic boundary conditions on the real-space correlator and choosing initial conditions by convolving a white noise random field results in a significantly smaller error than the traditional procedure of using the power spectrum. This convolution picture produces exact correlation functions out to separations of L/2, where L is the box size, which is the maximum theoretically allowed. This method also produces tophat sphere fluctuations which are exact at radii $ R \\le L/4 $. It is equivalent to windowing the power spectrum with the simulation volume before discretizing, thus bypassing sparse sampling problems. The mean density perturbation in the volume is no longer constrained to be zero, allowing one to assemble a large simulation using a series of smaller ones. This is especially important for simulations of Lyman-$\\alpha$ systems where sma...

Pen, U L

1997-01-01T23:59:59.000Z

232

Next Generation Geothermal Power Plants: 2012 Update  

Science Conference Proceedings (OSTI)

The intent of this report is to provide an update of historical and current trends in geothermal power plant technology, extending the previous Next Generation Geothermal Power Plant (NGGPP) report originally developed by EPRI in 1996.BackgroundIn its 1996 study, EPRI evaluated a number of technologies with the potential to lower the cost of geothermal power production or to expand cost effective power production to lower temperature resources, thus opening ...

2012-12-13T23:59:59.000Z

233

Energy efficient prediction clustering algorithm for multilevel heterogeneous wireless sensor networks  

E-Print Network (OSTI)

In designing wireless sensor networks, it is important to reduce energy dissipation and prolong network lifetime. In this paper, a new model with energy and monitored objects heterogeneity is proposed for heterogeneous wireless sensor networks. We put forward an energy-efficient prediction clustering algorithm, which is adaptive to the heterogeneous model. This algorithm enables the nodes to select the cluster head according to factors such as energy and communication cost, thus the nodes with higher residual energy have higher probability to become a cluster head than those with lower residual energy, so that the network energy can be dissipated uniformly. In order to reduce energy consumption when broadcasting in clustering phase and prolong network lifetime, an energy consumption prediction model is established for regular data acquisition nodes. Simulation results show that compared with current clustering algorithms, this algorithm can achieve longer sensor network lifetime, higher energy efficiency and ...

Liu, Tang; Yang, Jin; Wang, Chunli

2011-01-01T23:59:59.000Z

234

Implementation of the Iterative Proportion Fitting Algorithm for Geostatistical Facies Modeling  

SciTech Connect

In geostatistics, most stochastic algorithm for simulation of categorical variables such as facies or rock types require a conditional probability distribution. The multivariate probability distribution of all the grouped locations including the unsampled location permits calculation of the conditional probability directly based on its definition. In this article, the iterative proportion fitting (IPF) algorithm is implemented to infer this multivariate probability. Using the IPF algorithm, the multivariate probability is obtained by iterative modification to an initial estimated multivariate probability using lower order bivariate probabilities as constraints. The imposed bivariate marginal probabilities are inferred from profiles along drill holes or wells. In the IPF process, a sparse matrix is used to calculate the marginal probabilities from the multivariate probability, which makes the iterative fitting more tractable and practical. This algorithm can be extended to higher order marginal probability constraints as used in multiple point statistics. The theoretical framework is developed and illustrated with estimation and simulation example.

Li Yupeng, E-mail: yupeng@ualberta.ca; Deutsch, Clayton V. [University of Alberta (Canada)

2012-06-15T23:59:59.000Z

235

BATTERY -FRIENDLY DESIGN OF SIGNAL PROCESSING ALGORITHMS Praveen Raghavan & Chaitali Chakrabarti  

E-Print Network (OSTI)

BATTERY - FRIENDLY DESIGN OF SIGNAL PROCESSING ALGORITHMS Praveen Raghavan & Chaitali Chakrabarti metric. This is unfortunate since maximizing battery lifetime is a more appropriate inetric, and lowering energy does not necessarily mean improving battery lifetime. In this paper we first show how to design

Chakrabarti, Chaitali

236

Recognition and decision-making algorithm in human locomotion based on the principles of fuzzy reasoning  

Science Conference Proceedings (OSTI)

The authors introduce a fuzzy rule-based algorithm to evaluate the activation patterns of muscles of the lower limb with respect to the gait phases during normal human walking. A relational matrix was established as a Cartesian product between the activation ...

T. Sarkodie-Gyan; Huiying Yu; Murad Alaqtash; Eric Spier; Richard Brower

2009-12-01T23:59:59.000Z

237

SelInv---An Algorithm for Selected Inversion of a Sparse Symmetric Matrix  

Science Conference Proceedings (OSTI)

We describe an efficient implementation of an algorithm for computing selected elements of a general sparse symmetric matrix A that can be decomposed as A = LDLT, where L is lower triangular and D is diagonal. Our implementation, ... Keywords: Electronic structure calculation, elimination tree, selected inversion, sparse LDLT factorization, supernodes

Lin Lin; Chao Yang; Juan C. Meza; Jianfeng Lu; Lexing Ying; Weinan E

2011-02-01T23:59:59.000Z

238

The Pandora Particle Flow Algorithm  

E-Print Network (OSTI)

A high-energy e+e- collider, such as the ILC or CLIC, is arguably the best option to complement and extend the LHC physics programme. A lepton collider will allow for exploration of Standard Model Physics, such as precise measurements of the Higgs, top and gauge sectors, in addition to enabling a multitude of New Physics searches. However, physics analyses at such a collider will place unprecedented demands on calorimetry, with a required jet energy resolution of \\sigma(E)/E energy resolution by fully reconstructing the paths of individual particles through the detector. The energies of charged particles can then be extracted from precise inner detector tracker measurements, whilst photon energies will be measured in the ECAL, and only neutral hadron energies (10% of jet energies) will be measured in the HCAL, largely avoiding the typically poor HCAL resolution. This document introduces the Pandora particle flow algorithms, which offer the current state of the art in particle flow calorimetry for the ILC and CLIC. The performance of the algorithms is investigated by examining the reconstructed jet energy resolution and the ability to separate the hadronic decays of W and Z bosons.

J. S. Marshall; M. A. Thomson

2013-08-21T23:59:59.000Z

239

Modeling of the electron distribution based on bremsstrahlung emission during lower hybrid current drive on PLT  

SciTech Connect

Lower hybrid current drive requires the generation of a high energy electron tail anisotropic in velocity. Measurements of bremsstrahlung emission produced by this tail are compared with the calculated emission from reasonable model distributions. The physical basis and the sensitivity of this modeling process are described and the plasma properties of current driven discharges which can be derived from the model are discussed.

Stevens, J.E.; von Goeler, S.; Bernabei, S.; Bitter, M.; Chu, T.K.; Efthimion, P.; Fisch, N.; Hooke, W.; Hosea, J.; Jobes, F.

1985-03-01T23:59:59.000Z

240

Experimental studies of lower hybrid wave propagation  

SciTech Connect

Experimental measurements of the dispersion and damping of externally excited lower hybrid waves are presented. A multiple-ring slow-wave antenna, having 2$pi$/k/sub z/ = 23 cm, is used to excite these waves in the Princeton L3 or L4 linear devices (B = 0.5 -- 2.8 kG uniform to +- 1 percent for 1.6 m, n approximately 10$sup 10$, T/sub e/ approximately 3-5 eV, T/sub i/ less than or equal to 0.1 eV, He gas, plasma diameter approximately 10 cm). The waves are localized in a spatial wave packet that propagates into the plasma along a conical trajectory which makes a small angle with respect to the confining magnetic field. Measurements of the dependence of wavelength on frequency are in good agreement with the cold plasma dispersion relation. Measured values of the wave damping are in good agreement with Landau damping by the combination of the main body of the electron distribution and a approximately 30 percent high energy (T/sub e/ approximately 15-30 eV) electron tail. (auth)

Bellan, P.; Porkolab, M.

1976-01-01T23:59:59.000Z

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


241

Opportunities to change development pathways toward lower greenhouse...  

NLE Websites -- All DOE Office Websites (Extended Search)

to change development pathways toward lower greenhouse gas emissions through energy efficiency Title Opportunities to change development pathways toward lower greenhouse gas...

242

The 'Watcher's Stage' in Lower Colorado River Indian Agriculture  

E-Print Network (OSTI)

Primitive Subsistence on the Lower Colorado and Gila Rivers.Watcher's Stage' in Lower Colorado River Indian AgricultureIndian tribes along the Colorado River to various interior

Lawton, Harry W.; Wilke, Philip J.

1977-01-01T23:59:59.000Z

243

Lower 48 States Shale Proved Reserves (Billion Cubic Feet)  

Annual Energy Outlook 2012 (EIA)

View History: Annual Download Data (XLS File) Lower 48 States Shale Proved Reserves (Billion Cubic Feet) Lower 48 States Shale Proved Reserves (Billion Cubic Feet) Decade Year-0...

244

Generation of a suite of 3D computer-generated breast phantoms from a limited set of human subject data  

SciTech Connect

Purpose: The authors previously reported on a three-dimensional computer-generated breast phantom, based on empirical human image data, including a realistic finite-element based compression model that was capable of simulating multimodality imaging data. The computerized breast phantoms are a hybrid of two phantom generation techniques, combining empirical breast CT (bCT) data with flexible computer graphics techniques. However, to date, these phantoms have been based on single human subjects. In this paper, the authors report on a new method to generate multiple phantoms, simulating additional subjects from the limited set of original dedicated breast CT data. The authors developed an image morphing technique to construct new phantoms by gradually transitioning between two human subject datasets, with the potential to generate hundreds of additional pseudoindependent phantoms from the limited bCT cases. The authors conducted a preliminary subjective assessment with a limited number of observers (n= 4) to illustrate how realistic the simulated images generated with the pseudoindependent phantoms appeared. Methods: Several mesh-based geometric transformations were developed to generate distorted breast datasets from the original human subject data. Segmented bCT data from two different human subjects were used as the 'base' and 'target' for morphing. Several combinations of transformations were applied to morph between the 'base' and 'target' datasets such as changing the breast shape, rotating the glandular data, and changing the distribution of the glandular tissue. Following the morphing, regions of skin and fat were assigned to the morphed dataset in order to appropriately assign mechanical properties during the compression simulation. The resulting morphed breast was compressed using a finite element algorithm and simulated mammograms were generated using techniques described previously. Sixty-two simulated mammograms, generated from morphing three human subject datasets, were used in a preliminary observer evaluation where four board certified breast radiologists with varying amounts of experience ranked the level of realism (from 1 ='fake' to 10 ='real') of the simulated images. Results: The morphing technique was able to successfully generate new and unique morphed datasets from the original human subject data. The radiologists evaluated the realism of simulated mammograms generated from the morphed and unmorphed human subject datasets and scored the realism with an average ranking of 5.87 {+-} 1.99, confirming that overall the phantom image datasets appeared more 'real' than 'fake.' Moreover, there was not a significant difference (p > 0.1) between the realism of the unmorphed datasets (6.0 {+-} 1.95) compared to the morphed datasets (5.86 {+-} 1.99). Three of the four observers had overall average rankings of 6.89 {+-} 0.89, 6.9 {+-} 1.24, 6.76 {+-} 1.22, whereas the fourth observer ranked them noticeably lower at 2.94 {+-} 0.7. Conclusions: This work presents a technique that can be used to generate a suite of realistic computerized breast phantoms from a limited number of human subjects. This suite of flexible breast phantoms can be used for multimodality imaging research to provide a known truth while concurrently producing realistic simulated imaging data.

Hsu, Christina M. L. [Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708 and Carl E. Ravin Advanced Imaging Laboratories, Duke University Medical Center, Durham, North Carolina 27705 (United States); Palmeri, Mark L. [Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708 (United States); Department of Anesthesiology, Duke University Medical Center, Durham, North Carolina 27710 (United States); Segars, W. Paul [Carl E. Ravin Advanced Imaging Laboratories, Duke University Medical Center, Durham, North Carolina 27705 (United States); Department of Radiology, Duke University Medical Center, Durham, North Carolina 27710 (United States); Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708 (United States); Medical Physics Graduate Program, Duke University, Durham, North Carolina 27705 (United States); Veress, Alexander I. [Department of Mechanical Engineering, University of Washington, Seattle, Washington 98195 (United States); Dobbins, James T. III [Carl E. Ravin Advanced Imaging Laboratories, Duke University Medical Center, Durham, North Carolina 27705 (United States); Department of Radiology, Duke University Medical Center, Durham, North Carolina 27710 (United States); Department of Biomedical Engineering, Duke University, Durham, North Carolina 27708 (United States); Medical Physics Graduate Program, Duke University, Durham, North Carolina 27705 (United States); Department of Physics, Duke University, Durham, North Carolina 27708 (United States)

2013-04-15T23:59:59.000Z

245

GA based energy loss minimization approach for optimal sizing & placement of distributed generation  

Science Conference Proceedings (OSTI)

Distributed Generators (DG) provide the lowest cost solution to handle low voltage or overload problems. In conjunction with such problems, a technique of energy saving is introduced by placement of distributed generation (DG) in distribution systems. ... Keywords: Distributed generation (DG), energy saving, genetic algorithms (GA), optimal sizing and placement

Deependra Singh; Devender Singh; K. S. Verma

2008-04-01T23:59:59.000Z

246

Optimal Reactive Power Planning of Radial Distribution Systems with Distributed Generation  

Science Conference Proceedings (OSTI)

The paper analyzes reactive power optimization problem in distribution system with wind power and PV generators. Reactive power optimization mathematical model including the active power loss, reactive power compensation capacity and static voltage margin ... Keywords: Distributed generation, Distributed Generation, Immune Algorithm, Cluster Evolutionary

Li Shengqi, Zeng Lilin, Li Yongan, He Zhengping

2013-01-01T23:59:59.000Z

247

Next Generation CANDU Performance Assurance  

SciTech Connect

AECL is developing a next generation CANDU design to meet market requirements for low cost, reliable energy supplies. The primary product development objective is to achieve a capital cost substantially lower than the current nuclear plant costs, such that the next generation plant will be competitive with alternative options for large-scale base-load electricity supply. However, other customer requirements, including safety, low-operating costs and reliable performance, are being addressed as equally important design requirements. The main focus of this paper is to address the development directions that will provide performance assurance. The next generation CANDU is an evolutionary extension of the proven CANDU 6 design. There are eight CANDU 6 units in operation in four countries around the world and further three units are under construction. These units provide a sound basis for projecting highly reliable performance for the next generation CANDU. In addition, the next generation CANDU program includes development and qualification activities that will address the new features and design extensions in the advanced plant. To limit product development risk and to enhance performance assurance, the next generation CANDU design features and performance parameters have been carefully reviewed during the concept development phase and have been deliberately selected so as to be well founded on the existing CANDU knowledge base. Planned research and development activities are required only to provide confirmation of the projected performance within a modest extension of the established database. Necessary qualification tests will be carried out within the time frame of the development program, to establish a proven design prior to the start of a construction project. This development support work coupled with ongoing AECL programs to support and enhance the performance and reliability of the existing CANDU plants will provide sound assurance that the next generation CANDU plants will meet customer expectations. (authors)

Wren, David J.; Allsop, P.J.; Hopwood, J.M. [Atomic Energy of Canada Ltd., Ontario (Canada)

2002-07-01T23:59:59.000Z

248

Hydrogen Generation by Electrolysis  

NLE Websites -- All DOE Office Websites (Extended Search)

Better Engineered Solutions. Better Engineered Solutions. What Listening Generates. Better Engineered Solutions. What Listening Generates. Hydrogen Generation by Electrolysis September 2004 Steve Cohen Hydrogen Generation by Electrolysis September 2004 Steve Cohen NREL H 2 Electrolysis - Utility Integration Workshop NREL H 2 Electrolysis - Utility Integration Workshop 2 Hydrogen Generation by Electrolysis Hydrogen Generation by Electrolysis  Intro to Teledyne Energy Systems  H 2 Generator Basics & Major Subsystems  H 2 Generating & Storage System Overview  Electrolysis System Efficiency & Economics  Focus for Attaining DOE H 2 Production Cost Goals 3 Teledyne Energy Systems Locations - ISO 9001 Teledyne Energy Systems Locations - ISO 9001 Hunt Valley, Maryland  State-of-the-art thermoelectric,

249

Siemens Power Generation, Inc.  

NLE Websites -- All DOE Office Websites (Extended Search)

Presented at the 2005 Pittsburgh Coal Conference Siemens Power Generation, Inc. Page 1 of 10 Siemens Power Generation, Inc., All Rights Reserved Development of a Catalytic...

250

Industrial Waste Generation  

NLE Websites -- All DOE Office Websites (Extended Search)

9) Page 2 of 7 Industrial Waste Generation Work with Engineered Nanomaterials Power Consumption Historical Contamination (groundwater, soil) Hazardous Waste Generation Atmospheric...

251

Utility Solar Generation Valuation Methods  

DOE Green Energy (OSTI)

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

Hansen, Thomas N.; Dion, Phillip J.

2009-06-30T23:59:59.000Z

252

Parallel Algorithms for Image Processing on OMC  

Science Conference Proceedings (OSTI)

The author studies a class of VLSI organizations with optical interconnects for fast solutions to several image processing tasks. The organization and operation of these architectures are based on a generic model called OMC, which is used to understand ... Keywords: OMC, computational complexity, computational limits, computerised picture processing, constant time algorithms, fine grain image computing, free space optics, generic model, image processing, optical information processing, optical interconnects, parallel algorithms, parallel algorithms.

Mary Mehrnoosh Eshaghian

1991-07-01T23:59:59.000Z

253

Efficient Algorithms for Modeling Reacting Flows  

NLE Websites -- All DOE Office Websites (Extended Search)

the development of efficient numerical algorithms that reduce the time required to model combustion phenomena are of great interest. In this talk I will present the development...

254

IMPROVED ALGORITHMS FOR CONVEX MINIMIZATION IN ...  

E-Print Network (OSTI)

are devoted to the description and analysis of algorithms. In Section ..... constant value and then “finish the job” by taking O(??2??2) additional subgradient steps

255

A NONSTANDARD SIMPLEX ALGORITHM FOR LINEAR ...  

E-Print Network (OSTI)

standard simplex algorithm. 2. Pivoting operations. In the next section, we describe column and row pivot- ing operations. This topic is closely related to the  ...

256

Dictionary of Algorithms and Data Structures  

Science Conference Proceedings (OSTI)

... [GBY91] Gaston H. Gonnet and Ricardo Baeza-Yates, Handbook of Algorithms and ... [HS83] Ellis Horowitz and Sartaj Sahni, Fundamentals of Data ...

2013-08-23T23:59:59.000Z

257

Dictionary of Algorithms and Data Structures  

Science Conference Proceedings (OSTI)

... Some terms with a leading variable, such as n ... To look up words or phrases, enter them in ... paths alphabet Alpha Skip Search algorithm alternating ...

2013-11-08T23:59:59.000Z

258

BIASED RANDOM-KEY GENETIC ALGORITHMS WITH ...  

E-Print Network (OSTI)

Handbook of Metaheuristics. Kluwer. Academic Publishers, 2003. J.F. Gonçalves and M.G.C. Resende. Biased random-key genetic algorithms for combinatorial ...

259

Solar and Moon Position Algorithm (SAMPA)  

This algorithm calculates the solar and lunar zenith and azimuth angles in the period from the year -2000 to 6000, with uncertainties of +/- 0.0003 ...

260

B. The Multi-objective Genetic Algorithm  

E-Print Network (OSTI)

was no cooperation, then the upper-right part of the boundary curve in between ...... experiments in machine learning using vector evaluated genetic algorithms.

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


261

?1 Minimization via Randomized First Order Algorithms  

E-Print Network (OSTI)

In this paper we propose randomized first-order algorithms for solving bilinear ...... does not require knowledge of ?) is not worse that the “theoretically optimal” ...

262

Evaluation of On-ramp Control Algorithms  

E-Print Network (OSTI)

metering algorithm - high level design, Final Report, Prepared by NETmetering (SWARM) SWARM (Paesani et al. , 1997; Report 3, 1996) is developed by NET and

Jin, Wenlong; Zhang, Michael

2001-01-01T23:59:59.000Z

263

Available Technologies: Algorithm for Flexible Bandwidth ...  

The general solution to such analysis requires exponential ... the algorithm is of polynomial-time complexity in the worst case scenario, and it is bounded by ...

264

MEMORANDUM OF UNDERSTANDING Between The Numerical Algorithms...  

NLE Websites -- All DOE Office Websites (Extended Search)

Numerical Algorithms Group Ltd (NAG) with a registered address at: Wilkinson House, Jordan hill Road, Oxford, UK and the University of California, as Management and Operating...

265

Student's algorithm solves real-world problem  

NLE Websites -- All DOE Office Websites (Extended Search)

how to use powerful computers to analyze, model, and solve real-world problems," Jordan Medlock wins supercomputer challenge with his algorithm that automates counting and...

266

Parameter Identification of Vibration Loads of Hydro Generator Using Neural Networks  

Science Conference Proceedings (OSTI)

Abstract Abstract Abstract Vibrating dynamic characteristics have been a major unknown in the modeling and mechanical analysis of large hydro generators. An identification algorithm for vibrating dynamic characterization by using artificial neural network ...

Lijuan Cao; Shouju Li; Zichang Shangguan

2008-06-01T23:59:59.000Z

267

Generation of Optimal Unit Distance Codes for Rotary Encoders through Simulated Evolution  

Science Conference Proceedings (OSTI)

An evolutionary algorithm is used to generate unit distance codes for absolute rotary encoders. The target is to obtain a code suitable for disk size reduction, or for resolution increase, thus overcoming the limitations of conventional Gray codes. Obtained ...

Stefano Gregori; Roberto Rossi; Guido Torelli; Valentino Liberali

2001-04-01T23:59:59.000Z

268

ULTRASONIC IMAGING USING A FLEXIBLE ARRAY: IMPROVEMENTS TO THE MAXIMUM CONTRAST AUTOFOCUS ALGORITHM  

SciTech Connect

In previous work, we have presented the maximum contrast autofocus algorithm for estimating unknown imaging parameters, e.g., for imaging through complicated surfaces using a flexible ultrasonic array. This paper details recent improvements to the algorithm. The algorithm operates by maximizing the image contrast metric with respect to the imaging parameters. For a flexible array, the relative positions of the array elements are parameterized using a cubic spline function and the spline control points are estimated by iterative maximisation of the image contrast via simulated annealing. The resultant spline gives an estimate of the array geometry and the profile of the surface that it has conformed to, allowing the generation of a well-focused image. A pre-processing step is introduced to obtain an initial estimate of the array geometry, reducing the time taken for the algorithm to convergence. Experimental results are demonstrated using a flexible array prototype.

Hunter, A. J.; Drinkwater, B. W.; Wilcox, P. D. [Department of Mechanical Engineering, University of Bristol (United Kingdom)

2009-03-03T23:59:59.000Z

269

Natural Gas Productive Capacity for the Lower-48 States  

Gasoline and Diesel Fuel Update (EIA)

for the Lower-48 States for the Lower-48 States 6/4/01 Click here to start Table of Contents Natural Gas Productive Capacity for the Lower-48 States Natural Gas Productive Capacity for the Lower-48 States Natural Gas Productive Capacity for the Lower-48 States - Summary - Natural Gas Productive Capacity for the Lower-48 States - Summary - PPT Slide Natural Gas Productive Capacity for the Lower-48 States - Summary - Natural Gas Productive Capacity for the Lower-48 States - Methodology - Natural Gas Productive Capacity for the Lower-48 States - Methodology - Natural Gas Productive Capacity for the Lower-48 States - Methodology - PPT Slide PPT Slide PPT Slide PPT Slide PPT Slide PPT Slide PPT Slide PPT Slide PPT Slide PPT Slide PPT Slide Other Areas PPT Slide PPT Slide PPT Slide

270

NUCLEAR FLASH TYPE STEAM GENERATOR  

DOE Patents (OSTI)

A nuclear steam generating apparatus is designed so that steam may be generated from water heated directly by the nuclear heat source. The apparatus comprises a pair of pressure vessels mounted one within the other, the inner vessel containing a nuclear reactor heat source in the lower portion thereof to which water is pumped. A series of small ports are disposed in the upper portion of the inner vessel for jetting heated water under pressure outwardly into the atmosphere within the interior of the outer vessel, at which time part of the jetted water flashes into steam. The invention eliminates the necessity of any intermediate heat transfer medium and components ordinarily required for handling that medium. (AEC)

Johns, F.L.; Gronemeyer, E.C.; Dusbabek, M.R.

1962-09-01T23:59:59.000Z

271

Generating Cosmological Gaussian Random Fields  

E-Print Network (OSTI)

We present a generic algorithm for generating Gaussian random initial conditions for cosmological simulations on periodic rectangular lattices. We show that imposing periodic boundary conditions on the real-space correlator and choosing initial conditions by convolving a white noise random field results in a significantly smaller error than the traditional procedure of using the power spectrum. This convolution picture produces exact correlation functions out to separations of L/2, where L is the box size, which is the maximum theoretically allowed. This method also produces tophat sphere fluctuations which are exact at radii $ R \\le L/4 $. It is equivalent to windowing the power spectrum with the simulation volume before discretizing, thus bypassing sparse sampling problems. The mean density perturbation in the volume is no longer constrained to be zero, allowing one to assemble a large simulation using a series of smaller ones. This is especially important for simulations of Lyman-$\\alpha$ systems where small boxes with steep power spectra are routinely used. We also present an extension of this procedure which generates exact initial conditions for hierarchical grids at negligible cost.

Ue-Li Pen

1997-09-25T23:59:59.000Z

272

Fast algorithms for computing the eigenvalue in the Schoof-Elkies-Atkin algorithm  

Science Conference Proceedings (OSTI)

The Schoof-Elkies-Atkin algorithm is the best known algorithm for counting the number of points of an elliptic curve defined over a finite field of large characteristic. Several practical and asymptotical improvements for the phase called eigenvalue ... Keywords: SEA algorithm, elliptic curves, point counting

P. Gaudry; F. Morain

2006-07-01T23:59:59.000Z

273

Searches for Fourth Generation Fermions  

SciTech Connect

We present the results from searches for fourth generation fermions performed using data samples collected by the CDF II and D0 Detectors at the Fermilab Tevatron p{bar p} collider. Many of these results represent the most stringent 95% C. L. limits on masses of new fermions to-date. A fourth chiral generation of massive fermions with the same quantum numbers as the known fermions is one of the simplest extensions of the SM with three generations. The fourth generation is predicted in a number of theories, and although historically have been considered disfavored, stands in agreement with electroweak precision data. To avoid Z {yields} {nu}{bar {nu}} constraint from LEP I a fourth generation neutrino {nu}{sub 4} must be heavy: m({nu}{sub 4}) > m{sub Z}/2, where m{sub Z} is the mass of Z boson, and to avoid LEP II bounds a fourth generation charged lepton {ell}{sub 4} must have m({ell}{sub 4}) > 101 GeV/c{sup 2}. At the same time due to sizeable radiative corrections masses of fourth generation fermions cannot be much higher the current lower bounds and masses of new heavy quarks t' and b' should be in the range of a few hundred GeV/c{sup 2}. In the four-generation model the present bounds on the Higgs are relaxed: the Higgs mass could be as large as 1 TeV/c{sup 2}. Furthermore, the CP violation is significantly enhanced to the magnitude that might account for the baryon asymmetry in the Universe. Additional chiral fermion families can also be accommodated in supersymmetric two-Higgs-doublet extensions of the SM with equivalent effect on the precision fit to the Higgs mass. Another possibility is heavy exotic quarks with vector couplings to the W boson Contributions to radiative corrections from such quarks with mass M decouple as 1/M{sup 2} and easily evade all experimental constraints. At the Tevatron p{bar p} collider 4-th generation chiral or vector-like quarks can be either produced strongly in pairs or singly via electroweak production, where the latter can be enhanced for vector-like quarks. In the following we present searches for both pair and single production of heavy quarks performed by CDF and D0 Collaborations.

Ivanov, A.; /Fermilab

2011-09-01T23:59:59.000Z

274

Synchronization and cell search algorithms in 3GPP long term evolution systems (FDD mode)  

Science Conference Proceedings (OSTI)

In this paper initial downlink synchronization (sync) and cell identification algorithms for the 3rd generation partnership project (3GPP) long term evolution (LTE) systems are presented. The frequency division duplex (FDD) mode is used in the downlink ... Keywords: 3GPP LTE, MIMO, OFDM, cell search, frequency and time synchronization

Abdo N. Gaber; Loay D. Khalaf; Ahmad M. Mustafa

2012-02-01T23:59:59.000Z

275

Hiding Checkpoint Overhead in HPC Applications with a Semi-Blocking Algorithm  

Science Conference Proceedings (OSTI)

The HPC community has seen a steady increase in the number of components in every generation of supercomputers. Assembling a large number of components into a single cluster makes a machine more powerful, but also much more prone to failures. Therefore, ... Keywords: fault tolerance, checkpoint/restart, semi-blocking algorithm, adaptive runtime system, SSD

Xiang Ni; Esteban Meneses; Laxmikant V. Kale

2012-09-01T23:59:59.000Z

276

Optimal operational strategy for hybrid renewable energy system using genetic algorithms  

Science Conference Proceedings (OSTI)

Off-grid settlements require efficient, reliable and cost-effective renewable energy as alternative to the power supplied by diesel generator. Techno-economic analysis is required to find the optimum renewable energy system in the long run. This paper ... Keywords: genetic algorithm, hybrid system, operation strategy, optimization, renewable energy

Juhari Ab. Razak; Kamaruzzaman Sopian; Zulkifli Mohd Nopiah; Azami Zaharim; Yusoff Ali

2007-12-01T23:59:59.000Z

277

Imperialist competitive algorithm for dynamic optimization of economic dispatch in power systems  

Science Conference Proceedings (OSTI)

As energy costs are expected to keep rising in the coming years, mostly due to a growing worldwide demand, optimizing power generation is of crucial importance for utilities. Economic power dispatch is a tool commonly used by electric power plant operators ... Keywords: dynamic optimization, economic dispatch, imperialist competitive algorithm, metaheuristic, microgrid

Robin Roche; Lhassane Idoumghar; Benjamin Blunier; Abdellatif Miraoui

2011-10-01T23:59:59.000Z

278

Sample-based collection and adjustment algorithm for metadata extraction parameter of flexible format document  

Science Conference Proceedings (OSTI)

We propose an algorithm for automatically generating metadata extraction parameters. It first enumerates candidates on the basis of metadata occurrence in training documents, and then examines these candidates to avoid side effects and to maximize effectiveness. ... Keywords: keyword extraction, layout characteristics, logical structure analysis, metadata extraction

Toshiko Matsumoto; Mitsuharu Oba; Takashi Onoyama

2010-06-01T23:59:59.000Z

279

Study of the behavior of a new boosting algorithm for recurrent neural networks  

Science Conference Proceedings (OSTI)

We present an algorithm for improving the accuracy of recurrent neural networks (RNNs) for time series forecasting. The improvement is achieved by combining a large number of RNNs, each of them is generated by training on a different set of examples. ...

Mohammad Assaad; Romuald Boné; Hubert Cardot

2005-09-01T23:59:59.000Z

280

Evolutionary algorithms for the design of grid-connected PV-systems  

Science Conference Proceedings (OSTI)

The sale of electric energy generated by photovoltaic (PV) plants has attracted much attention in recent years. The installation of PV plants aims to obtain the maximum benefit of captured solar energy. The current methodologies for planning the design ... Keywords: Differential evolution, Evolutionary algorithms, Numerical optimization, Photovoltaic plants

Daniel Gómez-Lorente; Isaac Triguero; Consolación Gil; A. Espín Estrella

2012-07-01T23:59:59.000Z

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


281

Optimal operational strategy for hybrid renewable energy system using genetic algorithms  

Science Conference Proceedings (OSTI)

Off-grid settlements require efficient, reliable and cost-effective renewable energy as alternative to the power supplied by diesel generator. Techno-economic analysis is required to find the optimum renewable energy system in the long run. This paper ... Keywords: genetic algorithms, hybrid system, operation strategy, optimization, renewable energy

Kamaruzzaman Sopian; Azami Zaharim; Yusoff Ali; Zulkifli Mohd Nopiah; Juhari Ab. Razak; Nor Salim Muhammad

2008-04-01T23:59:59.000Z

282

A Branch-Price-and-Cut Algorithm for Single-Product Maritime Inventory Routing  

Science Conference Proceedings (OSTI)

A branch-price-and-cut algorithm is developed for a complex maritime inventory-routing problem with varying storage capacities and production/consumption rates at facilities. The resulting mixed-integer pricing problem is solved exactly and efficiently ... Keywords: column generation, dynamic programming, integer programming, maritime inventory routing

Faramroze G. Engineer; Kevin C. Furman; George L. Nemhauser; Martin W. P. Savelsbergh; Jin-Hwa Song

2012-01-01T23:59:59.000Z

283

Extended Specifications and Test Data Sets for Data Level Comparisons of Direct Volume Rendering Algorithms  

Science Conference Proceedings (OSTI)

Abstract¿Direct volume rendering (DVR) algorithms do not generate intermediate geometry to create a visualization, yet they produce countless variations in the resulting images. Therefore, comparative studies are essential for objective interpretation. ... Keywords: Metrics, opacity, gradient, surface classification, volume visualization, image quality, uncertainty visualization.

Kwansik Kim; Craig M. Wittenbrink; Alex Pang

2001-10-01T23:59:59.000Z

284

Optimization of wind turbine energy and power factor with an evolutionary computation algorithm  

E-Print Network (OSTI)

Optimization of wind turbine energy and power factor with an evolutionary computation algorithm the energy capture from the wind and enhance the quality of the power produced by the wind turbine, and harmonic distortion. As the generation of wind energy on an industrial scale is relatively new, the area

Kusiak, Andrew

285

Songs and the analysis of algorithms  

Science Conference Proceedings (OSTI)

In teaching a course that includes the analysis of algorithms, songs can be used as teaching examples. Multiple examples can be done at one time, or in one homework set, without the background explanation required to analyze real algorithms. Many components ...

Darrah Chavey

1996-03-01T23:59:59.000Z

286

Communication and Computation in Distributed CSP Algorithms  

E-Print Network (OSTI)

Communication and Computation in Distributed CSP Algorithms C`esar Fern`andez1 , Ram´on B´ejar1 in the context of networked distributed systems. In order to study the performance of Distributed CSP (DisCSP consider two complete DisCSP algorithms: asynchronous backtracking (ABT) and asynchronous weak commitment

Krishnamachari, Bhaskar

287

Computer Vision Algorithms on Reconfigurable Logic Arrays  

Science Conference Proceedings (OSTI)

Abstract¿Computer vision algorithms are natural candidates for high performance computing systems. Algorithms in computer vision are characterized by complex and repetitive operations on large amounts of data involving a variety of data interactions ... Keywords: Reconfigurable computing, computer vision, image processing, image segmentation, neural networks, fingerprint matching.

Nalini K. Ratha; Anil K. Jain

1999-01-01T23:59:59.000Z

288

Bat algorithm: literature review and applications  

Science Conference Proceedings (OSTI)

Bat algorithm BA is a bio-inspired algorithm developed by Xin-She Yang in 2010 and BA has been found to be very efficient. As a result, the literature has expanded significantly in the last three years. This paper provides a timely review of the bat ...

Xin-She Yang, Xingshi He

2013-07-01T23:59:59.000Z

289

Dual extragradient algorithms extended to equilibrium problems  

Science Conference Proceedings (OSTI)

In this paper we propose two iterative schemes for solving equilibrium problems which are called dual extragradient algorithms. In contrast with the primal extragradient methods in Quoc et al. (Optimization 57(6):749---776, 2008) which require ... Keywords: Complexity, Dual extragradient algorithm, Equilibrium problem, Gap function, Nash-Cournot equilibria

Tran D. Quoc; Pham N. Anh; Le D. Muu

2012-01-01T23:59:59.000Z

290

A novel algorithm for dynamic task scheduling  

Science Conference Proceedings (OSTI)

This paper deals with the problem of dynamic task scheduling in grid environment of multi-processors. First, this paper formulates task scheduling as an optimization problem and then optimizes with a novel hybrid optimization algorithm. The proposed ... Keywords: Bacteria foraging optimization, Genetic algorithms, Grid computing, Task scheduling

Sasmita Kumari Nayak; Sasmita Kumari Padhy; Siba Prasada Panigrahi

2012-05-01T23:59:59.000Z

291

A new algorithm for gas network simulation  

Science Conference Proceedings (OSTI)

The simulation of natural gas networks has a growing importance for operators of networks. In this paper a new simulation algorithm based on the node potential analysis is presented. The approach is to evaluate analogies between electrical circuits and ... Keywords: algorithms, gas, modeling, networks, nonlinearities, simulation

Jens Rüdiger; Jurij Schiebelbein; Rainhart Lunderstädt; Joachim Horn

2006-02-01T23:59:59.000Z

292

Quantum Algorithm to Solve Satisfiability Problems  

E-Print Network (OSTI)

A new quantum algorithm is proposed to solve Satisfiability(SAT) problems by taking advantage of non-unitary transformation in ground state quantum computer. The energy gap scale of the ground state quantum computer is analyzed for 3-bit Exact Cover problems. The time cost of this algorithm on general SAT problems is discussed.

Wenjin Mao

2004-11-29T23:59:59.000Z

293

Gradient based variable forgetting factor RLS algorithm  

Science Conference Proceedings (OSTI)

An accurate new variable forgetting factor recursive least-square adaptive algorithm is derived. An improved mean square behaviour analysis is presented, which shows that the theoretical analysis and the simulation results are close to each other. The ... Keywords: RLS algorithm, adaptive filters, variable forgetting factor

C. F. So; S. C. Ng; S. H. Leung

2003-06-01T23:59:59.000Z

294

Hybrid algorithms for adaptive array systems  

Science Conference Proceedings (OSTI)

In recent years, mobile communications have caused an explosive growth to the number of wireless users. This growth has triggered an enormous demand not only for capacity but also for better coverage and quality of services with priority on interference ... Keywords: adaptive arrays, beamforming, least mean squares algorithm, mobile communications, sample matrix inversion algorithm, smart antennas

D. Papadimitriou; I. O. Vardiambasis

2005-03-01T23:59:59.000Z

295

Domestic load scheduling using genetic algorithms  

Science Conference Proceedings (OSTI)

An approach using a genetic algorithm to optimize the scheduling of domestic electric loads, according to technical and user-defined constraints and input signals, is presented and illustrative results are shown. The aim is minimizing the end-user's ... Keywords: automated energy management, domestic load scheduling, electric loads, genetic algorithms

Ana Soares; Állvaro Gomes; Carlos Henggeler Antunes; Hugo Cardoso

2013-04-01T23:59:59.000Z

296

Jumping ant routing algorithm for sensor networks  

Science Conference Proceedings (OSTI)

Enterprises that may rely on critical equipments which are constantly moving around, for example, hospitals - need to ensure they can know the current location of vital but mobile assets. Besides, the sensor node on each device should inform us whether ... Keywords: ARAMA (Ant Routing Algorithm for Mobile Ad-hoc Networks), Ad-hoc, JARA (Jumping Ant Routing Algorithm), MANET

Wei-Ming Chen; Chung-Sheng Li; Fu-Yu Chiang; Han-Chieh Chao

2007-10-01T23:59:59.000Z

297

Hierarchical geometric models for visible surface algorithms  

Science Conference Proceedings (OSTI)

The geometric structure inherent in the definition of the shapes of three-dimensional objects and environments is used not just to define their relative motion and placement, but also to assist in solving many other problems of systems for producing ... Keywords: geometric models, hidden surface algorithms, hierarchical data structures, visible surface algorithms

James H. Clark

1976-10-01T23:59:59.000Z

298

Multithread parallelization of Lepp-bisection algorithms  

Science Conference Proceedings (OSTI)

Longest edge (nested) algorithms for triangulation refinement in two dimensions are able to produce hierarchies of quality and nested irregular triangulations as needed both for adaptive finite element methods and for multigrid methods. They can be formulated ... Keywords: Finite element method, Lepp-bisection algorithm, Longest edge bisection, Parallel multithread refinement, Triangulation refinement

Maria-Cecilia Rivara; Pedro Rodriguez; Rafael Montenegro; Gaston Jorquera

2012-04-01T23:59:59.000Z

299

Generalized stack algorithms for decoding convolutional codes  

Science Conference Proceedings (OSTI)

A new class of generalized stack algorithms for decoding convolutional codes is presented. It is based on the Zigangirov-Jelinek (Z-J) algorithm but, instead of extending just the top node of the stack at all times, a number of the most likely paths ...

D. Haccoun; M. Ferguson

1975-11-01T23:59:59.000Z

300

Video search: are algorithms all we need?  

Science Conference Proceedings (OSTI)

This panel will debate various approaches to improving video search, and explore how professional cataloguing, crowd sourced metadata, and improvements in search algorithms will evolve over the next ten years. Panelists will explore the needs of large ... Keywords: algorithms, archives, design, search, video

Jeff Ubois; Jamie Davidson; Marko Grobelnik; Paul Over; Hans Westerhof

2010-04-01T23:59:59.000Z

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


301

Nonlinear piecewise polynomial approximation: Theory and Algorithms  

E-Print Network (OSTI)

algorithms for compression and quick rendering of Digital Terrain Elevation Data (DTED) maps and implement by these and further theoretical results, we develop eÃ?cient practical algorithms for compression and quick rendering linear approximation 23 2.3. Slim B-spaces 32 2.4. Skinny B-spaces 42 2.5. Fat B-spaces: The link

Karaivanov, Borislav

302

Nonlinear piecewise polynomial approximation: Theory and Algorithms  

E-Print Network (OSTI)

algorithms for compression and quick rendering of Digital Terrain Elevation Data (DTED) maps and implement results, we develop efficient practical algorithms for compression and quick rendering of Digital Terrain approximation 23 2.3. Slim B-spaces 32 2.4. Skinny B-spaces 42 2.5. Fat B-spaces: The link to Besov spaces 46 2

Karaivanov, Borislav

303

An energy complexity model for algorithms  

Science Conference Proceedings (OSTI)

Energy consumption has emerged as a first class computing resource for both server systems and personal computing devices. The growing importance of energy has led to rethink in hardware design, hypervisors, operating systems and compilers. Algorithm ... Keywords: energy efficient algorithms, parallel disk i/o model

Swapnoneel Roy; Atri Rudra; Akshat Verma

2013-01-01T23:59:59.000Z

304

LES algorithm for turbulent reactive flows simulation  

Science Conference Proceedings (OSTI)

The paper presents the development and implementation of a Large Eddy Simulation numerical algorithm for simulating turbulent reactive flows. The numerical algorithm is based on a 5 step modified Runge - Kutta numerical scheme with a dual time stepping ... Keywords: Runge - Kutta numerical scheme, large eddy simulation, linear eddy model

Ionut Porumbel; Cristian Cârl?nescu; Florin Gabriel Florean; Constantin Eusebiu Hritcu

2010-10-01T23:59:59.000Z

305

A novel mating approach for genetic algorithms  

Science Conference Proceedings (OSTI)

Genetic algorithms typically use crossover, which relies on mating a set of selected parents. As part of crossover, random mating is often carried out. A novel approach to parent mating is presented in this work. Our novel approach can be applied in ... Keywords: Genetic algorithms, mating index, mating strategies, premature convergence, self-adaptive mating

Severino F. Galán; Ole J. Mengshoel; Rafael Pinter

2013-05-01T23:59:59.000Z

306

Algorithms for improved performance in cryptographic protocols.  

SciTech Connect

Public key cryptographic algorithms provide data authentication and non-repudiation for electronic transmissions. The mathematical nature of the algorithms, however, means they require a significant amount of computation, and encrypted messages and digital signatures possess high bandwidth. Accordingly, there are many environments (e.g. wireless, ad-hoc, remote sensing networks) where public-key requirements are prohibitive and cannot be used. The use of elliptic curves in public-key computations has provided a means by which computations and bandwidth can be somewhat reduced. We report here on the research conducted in an LDRD aimed to find even more efficient algorithms and to make public-key cryptography available to a wider range of computing environments. We improved upon several algorithms, including one for which a patent has been applied. Further we discovered some new problems and relations on which future cryptographic algorithms may be based.

Schroeppel, Richard Crabtree; Beaver, Cheryl Lynn

2003-11-01T23:59:59.000Z

307

1-Safe Algorithms for Symmetric Site Configurations  

E-Print Network (OSTI)

In order to provide database availability in the presence of node and site failures, traditional 1-safe algorithms disallow primary and hot standby replicas to be located at the same site. This means that the failure of a single primary node must be handled like a failure of the entire primary site. Furthermore, this excludes symmetric site configurations, where the primary replicas are located at the site closest to the accessing clients. In this paper, we present three novel 1-safe algorithms that allow the above restrictions to be removed. The relative performance of these and the traditional algorithms are evaluated by means of simulation studies. Our main conclusion is that the restrictions of the traditional algorithms can be removed without significantly increasing the processing overhead, during normal operation. From an evaluation based on performance, availability, and transaction durability, the novel dependency tracking algorithm provides the best overall solution. 1 Intro...

Rune Humborstad; Maitrayi Sabaratnam; Svein-olaf Hvasshovd; Ystein Torbjrnsen

1997-01-01T23:59:59.000Z

308

Automatic generation of water distribution systems based on GIS data  

Science Conference Proceedings (OSTI)

In the field of water distribution system (WDS) analysis, case study research is needed for testing or benchmarking optimisation strategies and newly developed software. However, data availability for the investigation of real cases is limited due to ... Keywords: Algorithmic network generation, GIS-data, Hydraulic simulation, Modular design system, Water distribution system

Robert Sitzenfrei, Michael MöDerl, Wolfgang Rauch

2013-09-01T23:59:59.000Z

309

The Generation of Random Variates From a Relativistic Maxwellian Distribution  

E-Print Network (OSTI)

A procedure for generating random variates from a relativistic Maxwellian distribution with arbitrary temperature and drift velocity is presented. The algorithm is based on the rejection method and can be used to initialize particle velocities in kinetic simulations of plasmas and gases.

Swisdak, M

2013-01-01T23:59:59.000Z

310

POFGEC: growing neural network of classifying potential function generators  

Science Conference Proceedings (OSTI)

In this paper, we propose an architecture and learning algorithm for a growing neural network. Drawing inspiration from the idea of electrical potentials, we develop a classifier based on a set of synthesised potential fields over the domain of input ... Keywords: classification rules, electrical potentials, kernels, neural networks, potential function generators, potential functions

Natacha Gueorguieva; Iren Valova; Georgi Georgiev

2010-08-01T23:59:59.000Z

311

Bayesian Sampling and Ensemble Learning in Generative Topographic Mapping  

Science Conference Proceedings (OSTI)

Generative topographic mapping (GTM) is a statistical model to extract a hidden smooth manifold from data, like the self-organizing map (SOM). Although a deterministic search algorithm for the hyperparameters regulating the smoothness of the manifold ... Keywords: Gibbs sampler, Laplace method, Markov chain Monte Carlo, elastic net, evidence, hyperparameter search, self-organizing map, variational free energy

Akio Utsugi

2000-12-01T23:59:59.000Z

312

Pressurized circulating fluidized-bed combustion for power generation  

SciTech Connect

Second-generation Pressurized Circulating Fluidized Bed Combustion (PCFBC) is the culmination of years of effort in the development of a new generation of power plants which can operate on lower-quality fuels with substantially improved efficiencies, meet environmental requirements, and provide a lower cost of electricity. Air Products was selected in the DOE Clean Coal Technology Round V program to build, own, and operate the first commercial power plant using second-generation PCFBC technology, to be located at an Air Products chemicals manufacturing facility in Calvert City, Kentucky. This paper describes the second-generation PCFBC concept and its critical technology components.

Weimer, R.F.

1995-08-01T23:59:59.000Z

313

A three phase load flow algorithm for Shipboard Power Systems  

E-Print Network (OSTI)

Load Flow (Power Flow) is the determination of the steady state operating conditions for the system. This is a very important tool utilized by many real time applications in power systems. Traditional load flow methods, which incorporate Gauss-Seidel and/or Newton Raphson techniques, were primarily developed for transmission system analysis. Distribution load flow analysis must incorporate its unique characteristics such as unbalanced loads, distributed loads, radial network structure, and one, two, or three phase lines. Also, there are a variety of components included in distribution systems such as switches, transformers, voltage regulators, and distributed generators. Therefore, the traditional methods cannot be directly applied to distribution systems since the assumptions made for transmission systems are not valid for the unique characteristics of distribution systems. A Shipboard Power System (SPS) is a finite inertia electric power system. The generation, transmission, and distribution systems in SPSs are tightly coupled. In reality, the transmission system consists of the lines that interconnect the generator buses in a ring configuration. The distribution system consists of lines, transformers, and loads connected in a radial configuration. When analyzing a SPS, its distinct characteristics must be taken into consideration. Therefore, just as transmission and distribution systems have unique methods of analysis, SPSs also need a unique method of analysis. A load flow algorithm for a SPS must consider its distribution system characteristics as well as the unique characteristics of SPSs. The work presented in this thesis discussed a load flow algorithm developed for Shipboard Power Systems and terrestrial wye and delta connected radial distribution systems. The issues in developing a load flow algorithm for a SPS are addressed and the solution is presented. This solution combines three methods that addressed the issues of multiple sources, ring configuration, and radial load flow. This algorithm was tested on the IEEE 37 Bus Radial Distribution Test Feeder and a simplified Shipboard Power Test System developed by researchers in the Power System Automation Laboratory. The results produced minimal percent error when compared to the actual output results.

Medina-Calder?on, M?onica M

2003-01-01T23:59:59.000Z

314

A mixed-integer linear optimization model for local energy system planning based on simplex and branch-and-bound algorithms  

Science Conference Proceedings (OSTI)

A Mixed-integer linear optimization model is developed to support the decision making for the sustainable use of energy in the local area. It details exploitation of primary energy sources, electrical and thermal generation, enduse sectors and emissions. ... Keywords: branch-and-bound algorithm, local energy system, low-carbon society, mixed-integer linear optimization, simplex algorithm

Hongbo Ren; Weisheng Zhou; Weijun Gao; Qiong Wu

2010-09-01T23:59:59.000Z

315

Jet Observables Without Jet Algorithms  

E-Print Network (OSTI)

We introduce a new class of event shapes to characterize the jet-like structure of an event. Like traditional event shapes, our observables are infrared/collinear safe and involve a sum over all hadrons in an event, but like a jet clustering algorithm, they incorporate a jet radius parameter and a transverse momentum cut. Three of the ubiquitous jet-based observables---jet multiplicity, summed scalar transverse momentum, and missing transverse momentum---have event shape counterparts that are closely correlated with their jet-based cousins. Due to their "local" computational structure, these jet-like event shapes could potentially be used for trigger-level event selection at the LHC. Intriguingly, the jet multiplicity event shape typically takes on non-integer values, highlighting the inherent ambiguity in defining jets. By inverting jet multiplicity, we show how to characterize the transverse momentum of the n-th hardest jet without actually finding the constituents of that jet. Since many physics applications do require knowledge about the jet constituents, we also build a hybrid event shape that incorporates (local) jet clustering information. As a straightforward application of our general technique, we derive an event-shape version of jet trimming, allowing event-wide jet grooming without explicit jet identification. Finally, we briefly mention possible applications of our method for jet substructure studies.

Daniele Bertolini; Tucker Chan; Jesse Thaler

2013-10-28T23:59:59.000Z

316

Smolt Monitoring at the Head of Lower Granite Reservoir and Lower Granite Dam, 2005 Annual Report.  

DOE Green Energy (OSTI)

This project monitored the daily passage of Chinook salmon Oncorhynchus tshawytscha, steelhead trout O. mykiss, and sockeye salmon O. nerka smolts during the 2005 spring out-migration at migrant traps on the Snake River and Salmon River. In 2005 fish management agencies released significant numbers of hatchery Chinook salmon and steelhead trout above Lower Granite Dam that were not marked with a fin clip or coded-wire tag. Generally, the age-1 and older fish were distinguishable from wild fish by the occurrence of fin erosion. Age-0 Chinook salmon are more difficult to distinguish between wild and non-adclipped hatchery fish and therefore classified as unknown rearing. The total annual hatchery spring/summer Chinook salmon catch at the Snake River trap was 0.34 times greater in 2005 than in 2004. The wild spring/summer Chinook catch was 0.34 times less than the previous year. Hatchery steelhead trout catch was 0.67 times less than in 2004. Wild steelhead trout catch was 0.72 times less than the previous year. The Snake River trap collected 1,152 age-0 Chinook salmon of unknown rearing. During 2005, the Snake River trap captured 219 hatchery and 44 wild/natural sockeye salmon and 110 coho salmon O. kisutch of unknown rearing. Differences in trap catch between years are due to fluctuations not only in smolt production, but also differences in trap efficiency and duration of trap operation associated with flow. Trap operations began on March 6 and were terminated on June 3. The trap was out of operation for a total of one day due to heavy debris. FPC requested that the trap be restarted on June 15 through June 22 to collect and PIT tag age-0 Chinook salmon. Hatchery Chinook salmon catch at the Salmon River trap was 1.06 times greater and wild Chinook salmon catch was 1.26 times greater than in 2004. The hatchery steelhead trout collection in 2005 was 1.41 times greater and wild steelhead trout collection was 1.27 times greater than the previous year. Trap operations began on March 6 and were terminated on May 17 due to high flows. There were two days when the trap was taken out of service because of mechanical failure. Travel time (d) and migration rate (km/d) through Lower Granite Reservoir for passive integrated transponder (PIT) tagged Chinook salmon and steelhead trout marked at the Snake River trap were affected by discharge. Statistical analysis of 2005 data detected a relation between migration rate and discharge for hatchery Chinook but was unable to detect a relation for wild Chinook. The inability to detect a migration rate discharge relation for wild Chinook salmon was caused by a lack of data. For hatchery Chinook salmon there was a 1.8-fold increase in migration rate between 50 and 100 kcfs. For steelhead trout tagged at the Snake River trap, statistical analysis detected a significant relation between migration rate and lower Granite Reservoir inflow discharge. For hatchery and wild steelhead trout, there was a 2.2-fold and a 2.2-fold increase in migration rate, respectively, between 50 and 100 kcfs. Travel time and migration rate to Lower Granite Dam for fish marked at the Salmon River trap were calculated. Statistical analysis of the 2005 data detected a significant relation between migration rate and Lower Granite Reservoir inflow discharge for hatchery Chinook salmon, wild Chinook salmon, hatchery steelhead trout, and wild steelhead trout. Migration rate increased 4.2-fold for hatchery Chinook salmon, 2.9-fold for wild Chinook salmon and 2.5-fold for hatchery steelhead, and 1.7-fold for wild steelhead as discharge increased between 50 kcfs and 100 kcfs. Fish tagged with PIT tags at the Snake River and Salmon River traps were interrogated at four dams with PIT tag detection systems (Lower Granite, Little Goose, Lower Monumental and McNary dams). Because of the addition of the fourth interrogation site (Lower Monumental) in 1993 and the installation of the Removable Spillway Weir at Lower Granite Dam in 2001, caution must be used in comparing cumulative interrogation data. Cumulative interrogations at the fo

Buettner, Edwin W.; Putnam, Scott A. [Idaho Department of Fish and Game

2009-02-18T23:59:59.000Z

317

PRISM 2.0: Simulated Solar Energy Output Data for the Lower 48 States  

Science Conference Proceedings (OSTI)

The Electric Power Research Institute (EPRI) engaged AWS Truepower (AWST) to provide simulated solar energy output data for the lower 48 states under the PRISM 2.0 Project. AWST obtained and processed historical modeled solar irradiance data over the 14-year period 1997–2010. The project team used the data to identify the best solar resource in each of the lower 48 states up to 1% of developable land area; generate solar power output time series for utility-scale sites for several ...

2013-09-20T23:59:59.000Z

318

Automatic tool path generation for finish machining  

SciTech Connect

A system for automatic tool path generation was developed at Sandia National Laboratories for finish machining operations. The system consists of a commercially available 5-axis milling machine controlled by Sandia developed software. This system was used to remove overspray on cast turbine blades. A laser-based, structured-light sensor, mounted on a tool holder, is used to collect 3D data points around the surface of the turbine blade. Using the digitized model of the blade, a tool path is generated which will drive a 0.375 inch diameter CBN grinding pin around the tip of the blade. A fuzzified digital filter was developed to properly eliminate false sensor readings caused by burrs, holes and overspray. The digital filter was found to successfully generate the correct tool path for a blade with intentionally scanned holes and defects. The fuzzified filter improved the computation efficiency by a factor of 25. For application to general parts, an adaptive scanning algorithm was developed and presented with simulation results. A right pyramid and an ellipsoid were scanned successfully with the adaptive algorithm.

Kwok, Kwan S.; Loucks, C.S.; Driessen, B.J.

1997-03-01T23:59:59.000Z

319

Coupling between the University of California, Davis, Advanced Canopy–Atmosphere–Soil Algorithm (ACASA) and MM5: Preliminary Results for July 1998 for Western North America  

Science Conference Proceedings (OSTI)

The University of California, Davis, Advanced Canopy–Atmosphere–Soil Algorithm (ACASA) is coupled to the fifth-generation Pennsylvania State University–National Center for Atmospheric Research (NCAR) Mesoscale Model (MM5) as a land surface ...

R. David Pyles; Bryan C. Weare; Kyaw Tha Paw U; William Gustafson

2003-05-01T23:59:59.000Z

320

A Land and Ocean Microwave Cloud Classification Algorithm Derived from AMSU-A and -B, Trained Using MSG-SEVIRI Infrared and Visible Observations  

Science Conference Proceedings (OSTI)

A statistical cloud classification and cloud mask algorithm is developed based on Advanced Microwave Sounding Unit (AMSU-A and -B) microwave (MW) observations. The visible and infrared data from the Meteosat Third Generation-Spinning Enhanced ...

Filipe Aires; Francis Marquisseau; Catherine Prigent; Geneviève Sèze

2011-08-01T23:59:59.000Z

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


321

Smolt Monitoring at the Head of Lower Granite Reservoir and Lower Granite Dam, 2002 Annual Report.  

DOE Green Energy (OSTI)

This project monitored the daily passage of Chinook salmon Oncorhynchus tshawytscha, steelhead trout O. mykiss, and sockeye salmon smolts O. nerka during the 2002 spring out-migration at migrant traps on the Snake River and Salmon River. In 2002 fish management agencies released significant numbers of hatchery Chinook salmon and steelhead trout above Lower Granite Dam that were not marked with a fin clip or coded-wire tag. Generally, these fish were distinguishable from wild fish by the occurrence of fin erosion. Total annual hatchery Chinook salmon catch at the Snake River trap was 11.4 times greater in 2002 than in 2001. The wild Chinook catch was 15.5 times greater than the previous year. Hatchery steelhead trout catch was 2.9 times greater than in 2001. Wild steelhead trout catch was 2.8 times greater than the previous year. The Snake River trap collected 3,996 age-0 Chinook salmon of unknown rearing. During 2002, the Snake River trap captured 69 hatchery and 235 wild/natural sockeye salmon and 114 hatchery coho salmon O. kisutch. Differences in trap catch between years are due to fluctuations not only in smolt production, but also differences in trap efficiency and duration of trap operation associated with flow. The significant increase in catch in 2002 was due to a 3.1 fold increase in hatchery Chinook production and a more normal spring runoff. Trap operations began on March 10 and were terminated on June 7. The trap was out of operation for a total of four days due to mechanical failure or debris. Hatchery Chinook salmon catch at the Salmon River trap was 4.2 times greater and wild Chinook salmon catch was 2.4 times greater than in 2001. The hatchery steelhead trout collection in 2002 was 81% of the 2001 numbers. Wild steelhead trout collection in 2002 was 81% of the previous year's catch. Trap operations began on March 10 and were terminated on May 29 due to high flows. The trap was out of operation for four days due to high flow or debris. The increase in hatchery Chinook catch in 2002 was due to a 3.1 fold increase in hatchery production and differences in flow between years. Changes in hatchery and wild steelhead catch are probably due to differences in flow between years. Travel time (d) and migration rate (km/d) through Lower Granite Reservoir for PIT-tagged Chinook salmon and steelhead trout marked at the Snake River trap were affected by discharge. Statistical analysis of 2002 data detected a relation between migration rate and discharge for hatchery and wild Chinook salmon. For hatchery and wild Chinook salmon there was a 4.7-fold and a 3.7-fold increase in migration rate, respectively, between 50 and 100 kcfs. For steelhead trout tagged at the Snake River trap, statistical analysis detected a significant relation between migration rate and Lower Granite Reservoir inflow discharge. For hatchery and wild steelhead trout, there was a 1.8-fold and a 1.7-fold increase in migration rate, respectively, between 50 and 100 kcfs. Travel time and migration rate to Lower Granite Dam for fish marked at the Salmon River trap were calculated. Statistical analysis of the 2002 data detected a significant relation between migration rate and Lower Granite Reservoir inflow discharge for wild Chinook salmon and hatchery steelhead trout. The analysis was unable to detect a relation between migration rate and discharge for hatchery Chinook salmon. The lack of a detectable relation was probably a result of the migration rate data being spread over a very narrow range of discharge. Not enough data were available to perform the analysis for wild steelhead trout. Migration rate increased 4.3-fold for wild Chinook salmon and 2.2-fold for hatchery steelhead between 50 kcfs and 100 kcfs. Fish tagged with passive integrated transponder (PIT) tags at the Snake River trap were interrogated at four dams with PIT tag detection systems (Lower Granite, Little Goose, Lower Monumental, and McNary dams). Because of the addition of the fourth interrogation site (Lower Monumental) in 1993 and the installation of the Removable Spillway Weir at

Buettner, Edwin W.; Putnam, Scott A. [Idaho Department of Fish and Game

2009-02-18T23:59:59.000Z

322

Smolt Monitoring at the Head of Lower Granite Reservoir and Lower Granite Dam, 2004 Annual Report.  

DOE Green Energy (OSTI)

This project monitored the daily passage of Chinook salmon Oncorhynchus tshawytscha, steelhead trout O. mykiss, and sockeye salmon O. nerka smolts during the 2004 spring out-migration at migrant traps on the Snake River and Salmon River. In 2004 fish management agencies released significant numbers of hatchery Chinook salmon and steelhead trout above Lower Granite Dam that were not marked with a fin clip or coded-wire tag. Generally, these fish were distinguishable from wild fish by the occurrence of fin erosion. Total annual hatchery Chinook salmon catch at the Snake River trap was 1.1 times greater in 2004 than in 2003. The wild Chinook catch was 1.1 times greater than the previous year. Hatchery steelhead trout catch was 1.2 times greater than in 2003. Wild steelhead trout catch was 1.6 times greater than the previous year. The Snake River trap collected 978 age-0 Chinook salmon of unknown rearing. During 2004, the Snake River trap captured 23 hatchery and 18 wild/natural sockeye salmon and 60 coho salmon O. kisutch of unknown rearing. Differences in trap catch between years are due to fluctuations not only in smolt production, but also differences in trap efficiency and duration of trap operation associated with flow. Trap operations began on March 7 and were terminated on June 4. The trap was out of operation for a total of zero days due to mechanical failure or debris. Hatchery Chinook salmon catch at the Salmon River trap was 10.8% less and wild Chinook salmon catch was 19.0% less than in 2003. The hatchery steelhead trout collection in 2004 was 20.0% less and wild steelhead trout collection was 22.3% less than the previous year. Trap operations began on March 7 and were terminated on May 28 due to high flows. There were two days when the trap was taken out of service because wild Chinook catch was very low, hatchery Chinook catch was very high, and the weekly quota of PIT tagged hatchery Chinook had been met. Travel time (d) and migration rate (km/d) through Lower Granite Reservoir for PIT-tagged Chinook salmon and steelhead trout marked at the Snake River trap were affected by discharge. Statistical analysis of 2004 data detected a relation between migration rate and discharge for wild Chinook salmon but was unable to detect a relation for hatchery Chinook. The inability to detect a migration rate discharge relation for hatchery Chinook salmon was caused by age-0 fall Chinook being mixed in with the age 1 Chinook. Age-0 fall Chinook migrate much slower than age-1 Chinook, which would confuse the ability to detect the migration rate discharge relation. When several groups, which consisted of significant numbers of age-0 Chinook salmon, were removed from the analysis a relation was detected. For hatchery and wild Chinook salmon there was a 2.8-fold and a 2.4-fold increase in migration rate, respectively, between 50 and 100 kcfs. For steelhead trout tagged at the Snake River trap, statistical analysis detected a significant relation between migration rate and Lower Granite Reservoir inflow discharge. For hatchery and wild steelhead trout, there was a 2.3-fold and a 2.0-fold increase in migration rate, respectively, between 50 and 100 kcfs. Travel time and migration rate to Lower Granite Dam for fish marked at the Salmon River trap were calculated. Statistical analysis of the 2004 data detected a significant relation between migration rate and Lower Granite Reservoir inflow discharge for hatchery Chinook salmon, wild Chinook salmon and hatchery steelhead trout. Not enough data were available to perform the analysis for wild steelhead trout. Migration rate increased 7.0-fold for hatchery Chinook salmon, 4.7-fold for wild Chinook salmon and 3.8-fold for hatchery steelhead as discharge increased between 50 kcfs and 100 kcfs. Fish tagged with passive integrated transponder (PIT) tags at the Snake River and Salmon River traps were interrogated at four dams with PIT tag detection systems (Lower Granite, Little Goose, Lower Monumental, and McNary dams). Because of the addition of the fourth interrogation site (Lower Monume

Buettner, Edwin W.; Putnam, Scott A. [Idaho Department of Fish and Game

2009-02-18T23:59:59.000Z

323

Using Backup Generators  

Energy.gov (U.S. Department of Energy (DOE))

Power outages are commonplace during disasters, and they may last for several days. You can reduce losses and speed the recovery process by installing an emergency generator. Portable generators...

324

Federal Energy Management Program: Ten Ways to Lower Perceived...  

NLE Websites -- All DOE Office Websites (Extended Search)

Ten Ways to Lower Perceived Risk and Finance Rates within Utility Contract to someone by E-mail Share Federal Energy Management Program: Ten Ways to Lower Perceived Risk and...

325

Filamentation instability of lower hybrid waves in a plasma  

SciTech Connect

It is shown that a strong lower hybrid wave is modulationally unstable to perturbations propagating along its own wave vector. The instability relies critically on the finite thermal corrections to the lower hybrid dispersion relation. (auth)

Kaw, P. K.

1976-02-01T23:59:59.000Z

326

Next Generation Light Source  

•Next Generation Light Source – Super Thin Light Bulb, Energy Efficient, Long Life, Dimmable, and Uniform Illumination •High Entry Barrier – 71 ...

327

Main Generator Rotor Maintenance  

Science Conference Proceedings (OSTI)

Main generator rotors are constructed and designed to provide decades of reliable and trouble-free operation. However, a number of incidences have occurred over the years that can adversely impact reliable operation of generator rotors and, ultimately, production of electrical power. This report is a guide for power plant personnel responsible for reliable operation and maintenance of main generators. As a guide, this report provides knowledge and experience from generator experts working at power plants...

2006-11-27T23:59:59.000Z

328

Lower Cost Lithium Ion Batteries From Aluminum Substituted ...  

Lower Cost Lithium Ion Batteries From Aluminum Substituted Cathode Materials Lawrence Berkeley National Laboratory. Contact LBL About This Technology

329

Electron distribution function during lower-hybrid heating  

SciTech Connect

The acceleration of electrons during lower-hybrid heating is suppressed by a nonlinear interaction of parametrically excited waves.

Litvin, S.B.; Tikhonchuk, V.T.

1980-03-01T23:59:59.000Z

330

An effective shuffled frog-leaping algorithm for multi-mode resource-constrained project scheduling problem  

Science Conference Proceedings (OSTI)

In this paper, an effective shuffled frog-leaping algorithm (SFLA) is proposed for solving the multi-mode resource-constrained project scheduling problem (MRCPSP). In the SFLA, the virtual frogs are encoded as the extended multi-mode activity list (EMAL) ... Keywords: Combined local search, Multi-mode forward-backward improvement, Multi-mode permutation based local search, Multi-mode resource-constrained project scheduling, Multi-mode serial schedule generation scheme, Shuffled frog-leaping algorithm

Ling Wang; Chen Fang

2011-10-01T23:59:59.000Z

331

Generating safe template languages  

Science Conference Proceedings (OSTI)

Template languages are widely used within generative programming, because they provide intuitive means to generate software artefacts expressed in a specific object language. However, most template languages perform template instantiation on the level ... Keywords: generative programming, language extension, safe authoring, template language

Florian Heidenreich; Jendrik Johannes; Mirko Seifert; Christian Wende; Marcel Böhme

2009-10-01T23:59:59.000Z

332

Lower Columbia Salmon Recovery Fish & Wildlife Subbasin Plan  

E-Print Network (OSTI)

of volumes that together comprise a Recovery and Subbasin Plan for Washington lower Columbia River salmon Subbasin Plans Subbasin vision, assessments, and management plan for each of 12 Washington lower Columbia of Engineers Lee VanTussenbrook, Washington Department of Fish and Wildlife Lower Columbia Fish Recovery Board

333

Asynchronous Event-Driven Particle Algorithms  

Science Conference Proceedings (OSTI)

We present, in a unifying way, the main components of three asynchronous event-driven algorithms for simulating physical systems of interacting particles. The first example, hard-particle molecular dynamics (MD), is well-known. We also present a recently-developed diffusion kinetic Monte Carlo (DKMC) algorithm, as well as a novel stochastic molecular-dynamics algorithm that builds on the Direct Simulation Monte Carlo (DSMC). We explain how to effectively combine event-driven and classical time-driven handling, and discuss some promises and challenges for event-driven simulation of realistic physical systems.

Donev, A

2007-08-30T23:59:59.000Z

334

Asynchronous Event-Driven Particle Algorithms  

Science Conference Proceedings (OSTI)

We present in a unifying way the main components of three examples of asynchronous event-driven algorithms for simulating physical systems of interacting particles. The first example, hard-particle molecular dynamics (MD), is well-known. We also present a recently-developed diffusion kinetic Monte Carlo (DKMC) algorithm, as well as a novel event-driven algorithm for Direct Simulation Monte Carlo (DSMC). Finally, we describe how to combine MD with DSMC in an event-driven framework, and discuss some promises and challenges for event-driven simulation of realistic physical systems.

Donev, A

2007-02-28T23:59:59.000Z

335

Quantum Algorithms for Quantum Field Theories  

E-Print Network (OSTI)

Quantum field theory reconciles quantum mechanics and special relativity, and plays a central role in many areas of physics. We develop a quantum algorithm to compute relativistic scattering probabilities in a massive quantum field theory with quartic self-interactions (phi-fourth theory) in spacetime of four and fewer dimensions. Its run time is polynomial in the number of particles, their energy, and the desired precision, and applies at both weak and strong coupling. In the strong-coupling and high-precision regimes, our quantum algorithm achieves exponential speedup over the fastest known classical algorithm.

Stephen P. Jordan; Keith S. M. Lee; John Preskill

2011-11-15T23:59:59.000Z

336

Quantum Algorithms for Quantum Field Theories  

E-Print Network (OSTI)

Quantum field theory reconciles quantum mechanics and special relativity, and plays a central role in many areas of physics. We develop a quantum algorithm to compute relativistic scattering probabilities in a massive quantum field theory with quartic self-interactions (phi-fourth theory) in spacetime of four and fewer dimensions. Its run time is polynomial in the number of particles, their energy, and the desired precision, and applies at both weak and strong coupling. In the strong-coupling and high-precision regimes, our quantum algorithm achieves exponential speedup over the fastest known classical algorithm.

Jordan, Stephen P; Preskill, John

2011-01-01T23:59:59.000Z

337

Has my algorithm succeeded? an evaluator for human pose estimators  

Science Conference Proceedings (OSTI)

Most current vision algorithms deliver their output 'as is', without indicating whether it is correct or not. In this paper we propose evaluator algorithms that predict if a vision algorithm has succeeded. We illustrate this idea for the case ...

Nataraj Jammalamadaka; Andrew Zisserman; Marcin Eichner; Vittorio Ferrari; C. V. Jawahar

2012-10-01T23:59:59.000Z

338

Improvement of Surface Longwave Flux Algorithms Used in CERES Processing  

Science Conference Proceedings (OSTI)

An improvement was developed and tested for surface longwave flux algorithms used in the Clouds and the Earth’s Radiant Energy System processing based on lessons learned during the validation of global results of those algorithms. The algorithms ...

Shashi K. Gupta; David P. Kratz; Paul W. Stackhouse Jr.; Anne C. Wilber; Taiping Zhang; Victor E. Sothcott

2010-07-01T23:59:59.000Z

339

Using Genetic Algorithms to Optimize ACS-TSP  

Science Conference Proceedings (OSTI)

We propose the addition of Genetic Algorithms to Ant Colony System (ACS) applied to improve performance. Two modifications are proposed and tested. The first algorithm is a hybrid between ACS-TSP and a Genetic Algorithm that encodes experimental variables ...

Marcin L. Pilat; Tony White

2002-09-01T23:59:59.000Z

340

Accessibility of Analysis of Algorithms: from programming to problem solving  

Science Conference Proceedings (OSTI)

In Introduction to Analysis of Algorithms, students' first experience applying a combination of computer science theory and mathematics to paper-based problem solving, analysis of pre-developed algorithms, and proofs of algorithmic run-times. ...

Karina V Assiter

2005-12-01T23:59:59.000Z

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


341

Dynamic simulation of dual-speed wind turbine generation  

SciTech Connect

Induction generators have been used since the early development of utility-scale wind turbine generation. An induction generator is the generator of choice because of its ruggedness, and low cost. With an induction generator, the operating speed of the wind turbine is limited to a narrow range (almost constant speed). Dual- speed operation can be accomplished by using an induction generator with two different sets of winding configurations or by using two induction generators with two different rated speeds. With single- speed operation, the wind turbine operates at different power coefficients (Cp) as the wind speed varies. The operation at maximum Cp can occur only at a single wind speed. However, if the wind speed varies across a wider range, the operating Cp will vary significantly. Dual-speed operation has the advantage of enabling the wind turbine to operate at near maximum Cp over a wider range of wind-speeds. Thus, annual energy production can be increased. The dual-speed mode may generate less energy than a variable-speed mode; nevertheless, it offers an alternative to capture more energy than single-speed operation. In this paper, dual-speed operation of a wind turbine will be investigated. One type of control algorithm for dual- speed operation is proposed. Results from a dynamic simulation will be presented to show how the control algorithm works and how power, current and torque of the system vary as the wind turbine is exposed to varying wind speeds.

Muljadi, E.; Butterfield, C.P.

1996-10-01T23:59:59.000Z

342

Motor/generator  

DOE Patents (OSTI)

A motor/generator is provided for connecting between a transmission input shaft and an output shaft of a prime mover. The motor/generator may include a motor/generator housing, a stator mounted to the motor/generator housing, a rotor mounted at least partially within the motor/generator housing and rotatable about a rotor rotation axis, and a transmission-shaft coupler drivingly coupled to the rotor. The transmission-shaft coupler may include a clamp, which may include a base attached to the rotor and a plurality of adjustable jaws.

Hickam, Christopher Dale (Glasford, IL)

2008-05-13T23:59:59.000Z

343

Transacting generation attributes across market boundaries: Compatible information systems and the treatment of imports and exports  

E-Print Network (OSTI)

more renewable energy generation at lower costs, and (2) arelative incremental cost of renewable energy is low, and/orin higher costs for regulatory mandates and renewable energy

Grace, Robert; Wiser, Ryan

2002-01-01T23:59:59.000Z

344

Lower Valley Energy - Residential Energy Efficiency Rebate Program |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

Lower Valley Energy - Residential Energy Efficiency Rebate Program Lower Valley Energy - Residential Energy Efficiency Rebate Program Lower Valley Energy - Residential Energy Efficiency Rebate Program < Back Eligibility Residential Savings Category Home Weatherization Commercial Weatherization Appliances & Electronics Sealing Your Home Ventilation Heating & Cooling Commercial Heating & Cooling Water Heating Windows, Doors, & Skylights Program Info State Wyoming Program Type Utility Rebate Program Rebate Amount Energy Audit: Discounted Cost Weatherization Measures: Varies Marathon Water Heater: $25 Water Heater: $15 - $25 Clothes Washer: $25 - $50 Refrigerator: $15 Refrigerator Recycling: $75 Energy Star Manufactured Home: $1,000 Geothermal Heat Pumps: Up to $2,100 Provider Lower Valley Energy Lower Valley Energy offers numerous rebates for residential customers who

345

Alternative Fuels Data Center: Alternative Fuel Vehicles Lower Emissions in  

Alternative Fuels and Advanced Vehicles Data Center (EERE)

Alternative Fuel Alternative Fuel Vehicles Lower Emissions in Columbus, Ohio to someone by E-mail Share Alternative Fuels Data Center: Alternative Fuel Vehicles Lower Emissions in Columbus, Ohio on Facebook Tweet about Alternative Fuels Data Center: Alternative Fuel Vehicles Lower Emissions in Columbus, Ohio on Twitter Bookmark Alternative Fuels Data Center: Alternative Fuel Vehicles Lower Emissions in Columbus, Ohio on Google Bookmark Alternative Fuels Data Center: Alternative Fuel Vehicles Lower Emissions in Columbus, Ohio on Delicious Rank Alternative Fuels Data Center: Alternative Fuel Vehicles Lower Emissions in Columbus, Ohio on Digg Find More places to share Alternative Fuels Data Center: Alternative Fuel Vehicles Lower Emissions in Columbus, Ohio on AddThis.com...

346

DHARMA: A Tool for Evaluating Dynamic Scheduling Algorithms for Real-time Multiprocessor Systems  

E-Print Network (OSTI)

A majority of today's real-time systems assume a priori knowledge of task characteristics and hence are based on static designs which contribute to their high cost and inflexibility. The next generation hard real-time systems must be designed to be dynamic and flexible. This provides the motivation to study various dynamic scheduling proposals. In this paper, we discuss the design and implementation of a tool, called DHARMA, which is an attempt towards satisfying such requirements. The tool provides an environment to study various dynamic scheduling algorithms with or without fault-tolerance requirements and associated resource reclaiming algorithms in a multiprocessor real-time system.

G. Manimaran; Anand Manikutty; C. Siva Ram Murthy

1998-01-01T23:59:59.000Z

347

Student's algorithm solves real-world problem  

NLE Websites -- All DOE Office Websites (Extended Search)

Student's algorithm solves real-world problem Student's algorithm solves real-world problem Supercomputing Challenge: student's algorithm solves real-world problem Students learn how to use powerful computers to analyze, model, and solve real-world problems. April 3, 2012 Jordon Medlock of Albuquerque's Manzano High School won the 2012 Lab-sponsored Supercomputing Challenge Jordon Medlock of Albuquerque's Manzano High School won the 2012 Lab-sponsored Supercomputing Challenge by creating a computer algorithm that automates the process of counting and analyzing plaques, substances in the blood such as fat and cholesterol found in persons diagnosed with Alzheimer's disease. Contact Kurt Steinhaus (505) 665-7370 Email "The mission of the Supercomputing Challenge is to teach students how to use powerful computers to analyze, model, and solve real-world problems,"

348

Tracking Algorithm for Multi- Dimensional Array Transposition  

NLE Websites -- All DOE Office Websites (Extended Search)

He, SC2002 1 MPI and OpenMP Paradigms on Cluster of SMP Architectures: the Vacancy Tracking Algorithm for Multi- Dimensional Array Transposition Yun (Helen) He and Chris Ding...

349

CONVERGENCE OF FIXED-POINT CONTINUATION ALGORITHMS ...  

E-Print Network (OSTI)

Jun 18, 2009 ... solving the nuclear norm minimization problem [33]. By incorporating .... more information on the theory and algorithms for compressed sensing. The matrix rank ..... is called the unrecoverable energy (see [36]). Furthermore ...

350

Evaluating Heuristic Optimization Phase Order Search Algorithms  

Science Conference Proceedings (OSTI)

Program-specific or function-specific optimization phase sequences are universally accepted to achieve better overall performance than any fixed optimization phase ordering. A number of heuristic phase order space search algorithms have been devised ...

Prasad A. Kulkarni; David B. Whalley; Gary S. Tyson

2007-03-01T23:59:59.000Z

351

EOF-Based Linear Prediction Algorithm: Theory  

Science Conference Proceedings (OSTI)

This study considers the theory of a general three-dimensional (space and time) statistical prediction/extrapolation algorithm. The predictor is in the form of a linear data filter. The prediction kernel is based on the minimization of prediction ...

Kwang-Y. Kim; Gerald R. North

1998-11-01T23:59:59.000Z

352

An exact tree projection algorithm for wavelets  

E-Print Network (OSTI)

approach has its roots in the minimal cost-complexity pruning algorithm for .... is obtained by identifying the set ? ? Tk on which y has maximum energy. ... To maximize efficiency, optimal subtrees are in fact only found for all cardinalities which.

353

Algorithmic randomness, quantum physics, and incompleteness  

Science Conference Proceedings (OSTI)

Is randomness in quantum mechanics “algorithmically random”? Is there any relation between Heisenberg's uncertainty relation and Gödel's incompleteness? Can quantum randomness be used to trespass the Turing's barrier? Can ...

Cristian S. Calude

2004-09-01T23:59:59.000Z

354

Algorithms and Representations for Visual Recognition  

E-Print Network (OSTI)

a uniformly spaced linear B-Spline basis centered at theseinteresting connections between B-Spline basis and histogramand degree of the B-Splines, our proposed learning algorithm

Maji, Subhransu

2011-01-01T23:59:59.000Z

355

A hardware accelerator for speech recognition algorithms  

Science Conference Proceedings (OSTI)

This paper describes two custom architectures tailored to a speech recognition beam search algorithm. Both architectures have been simulated using real data and the results of the simulation are presented. The paper also describes the design process ...

T. S. Anantharaman; R. Bisiani

1986-06-01T23:59:59.000Z

356

A Nonlinear Programming Algorithm for Solving Semidefinite ...  

E-Print Network (OSTI)

Mar 9, 2001 ... The following fundamental proposition (whose proof can be found for ...... As stated in Section 3, the augmented Lagrangian algorithm does not have ...... In R. Saigal, L. Vandenberghe, and H. Wolkowicz, editors, Handbook of ...

357

subspace accelerated matrix splitting algorithms for bound ...  

E-Print Network (OSTI)

Their algorithm uses a projected gradient search in the first phase ..... eration is generally superior to a projected gradient iteration in terms of identifying an optimal ..... Once the subspace step has been computed, we enter Step 3 and compute.

358

Edge Detection Algorithm for SST Images  

Science Conference Proceedings (OSTI)

An algorithm to detect fronts in satellite-derived sea surface temperature fields is presented. Although edge detection is the main focus, the problem of cloud detection is also addressed since unidentified clouds can lead to erroneous edge ...

Jean-François Cayula; Peter Cornillon

1992-02-01T23:59:59.000Z

359

Visualization in Medicine: Theory, Algorithms, and Applications  

Science Conference Proceedings (OSTI)

Visualization in Medicine is the first book on visualization and its application to problems in medical diagnosis, education, and treatment. The book describes the algorithms, the applications and their validation (how reliable are the results?), ... Keywords: Computer Graphics

Bernhard Preim; Dirk Bartz

2007-06-01T23:59:59.000Z

360

The systems biology simulation core algorithm  

E-Print Network (OSTI)

Keller et al. : The systems biology simulation core algo-rithm. BMC Systems Biology 2013 7:55. Page 16 of 16 SubmitMacilwain C: Systems biology: evolving into the mainstream.

2013-01-01T23:59:59.000Z

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


361

DIRECT SEARCH ALGORITHMS OVER RIEMANNIAN MANIFOLDS ...  

E-Print Network (OSTI)

... method for function mini- mization over Rn. (See [18] for a detailed treatment of the algorithm). At each iteration,. ?LA-UR-06-7416. †email: dreisigm@lanl.gov.

362

Solar Position Algorithm (SPA) - Energy Innovation Portal  

This algorithm calculates the solar zenith and azimuth angles in the period from the year -2000 to 6000, with uncertainties of +/- 0.0003 degrees based on the date ...

363

Exact Algorithms for Combinatorial Optimization Problems with ...  

E-Print Network (OSTI)

Fuchs [10] showed that the problem of finding a minimum-power connected network with ... receiving node, in the latter all nodes except the source are addressed. ..... As an alternative, one could use an algorithm for general submodular ...

364

Evaluation of On-ramp Control Algorithms  

E-Print Network (OSTI)

net- works and development of a Fuzzy Logic Ramp Meteringmetering algorithm - high level design, Final Report, Prepared by NETset the new metering rate The most important function of net

Zhang, Michael; Kim, Taewan; Nie, Xiaojian; Jin, Wenlong; Chu, Lianyu; Recker, Will

2001-01-01T23:59:59.000Z

365

An algorithmic approach to social networks  

E-Print Network (OSTI)

Social networks consist of a set of individuals and some form of social relationship that ties the individuals together. In this thesis, we use algorithmic techniques to study three aspects of social networks: (1) we analyze ...

Liben-Nowell, David

2005-01-01T23:59:59.000Z

366

Competitive Ratio Analysis of Online Algorithms to Minimize Data Transmission Time in Energy Harvesting Communication System  

E-Print Network (OSTI)

We consider the optimal online packet scheduling problem in a single-user energy harvesting wireless communication system, where energy is harvested from natural renewable sources, making future energy arrivals instants and amounts random in nature. The most general case of arbitrary energy arrivals is considered where neither the future energy arrival instants or amount, nor their distribution is known. The problem considered is to adaptively change the transmission rate according to the causal energy arrival information, such that the time by which all packets are delivered is minimized. We assume that all bits have arrived and are ready at the source before the transmission begins. For a minimization problem, the utility of an online algorithm is tested by finding its competitive ratio or competitiveness that is defined to be the maximum of the ratio of the gain of the online algorithm with the optimal offline algorithm over all input sequences. We derive a lower and upper bound on the competitive ratio of...

Vaze, Rahul

2011-01-01T23:59:59.000Z

367

Window Memoization In Software As Applied To Image Processing Algorithms.  

E-Print Network (OSTI)

??A new local image processing algorithm, the Tahir algorithm, is an adaptation to the standard low-pass filter. Its design is for images that have the… (more)

Jaffer, Tahir

2010-01-01T23:59:59.000Z

368

An Approximation Algorithm for Constructing Error Detecting Prefix ...  

E-Print Network (OSTI)

Sep 2, 2006 ... Washington, DC, USA, june 2001. A The Modified BRCI Algorithm. Before describing the modified BRCI algorithm, we shall discuss some ...

369

Strongly Polynomial Primal-Dual Algorithms for Concave Cost ...  

E-Print Network (OSTI)

Feb 13, 2012 ... This technique yields a strongly polynomial primal-dual algorithm for a concave cost problem whenever such an algorithm exists for the ...

370

Strongly Polynomial Primal-Dual Algorithms for Concave Cost ...  

E-Print Network (OSTI)

Feb 13, 2012 ... Concave Cost Combinatorial Optimization Problems? ... algorithm for a concave cost problem whenever such an algorithm exists for the fixed-.

371

Spectral Bounds for Sparse PCA: Exact and Greedy Algorithms  

E-Print Network (OSTI)

computational costs and promote better generalization in learning algorithms. .... of an algorithm is to plot its variance curve ˜v(k) and compare it with the optimal ...

372

Smolt Monitoring at the Head of Lower Granite Reservoir and Lower Granite Dam, 2003 Annual Report.  

DOE Green Energy (OSTI)

This project monitored the daily passage of Chinook salmon Oncorhynchus tshawytscha, steelhead trout O. mykiss, and sockeye salmon O. nerka smolts during the 2003 spring out-migration at migrant traps on the Snake River and Salmon River. In 2003 fish management agencies released significant numbers of hatchery Chinook salmon and steelhead trout above Lower Granite Dam that were not marked with a fin clip or coded-wire tag. Generally, these fish were distinguishable from wild fish by the occurrence of fin erosion. Total annual hatchery Chinook salmon catch at the Snake River trap was 2.1 times less in 2003 than in 2002. The wild Chinook catch was 1.1 times less than the previous year. Hatchery steelhead trout catch was 1.7 times less than in 2002. Wild steelhead trout catch was 2.1 times less than the previous year. The Snake River trap collected 579 age-0 Chinook salmon of unknown rearing. During 2003, the Snake River trap captured five hatchery and 13 wild/natural sockeye salmon and 36 coho salmon O. kisutch of unknown rearing. Differences in trap catch between years are due to fluctuations not only in smolt production, but also differences in trap efficiency and duration of trap operation associated with flow. The significant differences in catch between 2003 and the previous year were due mainly to low flows during much of the trapping season and then very high flows at the end of the season, which terminated the trapping season 12 days earlier than in 2002. Trap operations began on March 9 and were terminated on May 27. The trap was out of operation for a total of zero days due to mechanical failure or debris. Hatchery Chinook salmon catch at the Salmon River trap was 16.8% less and wild Chinook salmon catch was 1.7 times greater than in 2002. The hatchery steelhead trout collection in 2003 was 5.6% less than in 2002. Wild steelhead trout collection was 19.2% less than the previous year. Trap operations began on March 9 and were terminated on May 24 due to high flows. There were zero days when the trap was out of operation due to high flow or debris. The decrease in hatchery Chinook catch in 2003 was partially due to differences in flow between years because there was a 5.9% increase in hatchery production in the Salmon River drainage in 2003. The decrease in hatchery steelhead catch may be partially due to a 13% decrease in hatchery production in the Salmon River drainage in 2003. Travel time (d) and migration rate (km/d) through Lower Granite Reservoir for PIT-tagged Chinook salmon and steelhead trout marked at the Snake River trap were affected by discharge. Statistical analysis of 2003 data detected a relation between migration rate and discharge for wild Chinook salmon but was unable to detect a relation for hatchery Chinook. The inability to detect a migration rate discharge relation for hatchery Chinook was probably caused by age 0 fall Chinook being mixed in with the age 1 Chinook. Age 0 fall Chinook migrate much slower than age 1 Chinook, which would confuse the ability to detect the migration rate discharge relation. For wild Chinook salmon there was a 1.4-fold increase in migration rate, respectively, between 50 and 100 kcfs. For steelhead trout tagged at the Snake River trap, statistical analysis detected a significant relation between migration rate and Lower Granite Reservoir inflow discharge. For hatchery and wild steelhead trout, there was a 1.7-fold and a 1.9-fold increase in migration rate, respectively, between 50 and 100 kcfs. Travel time and migration rate to Lower Granite Dam for fish marked at the Salmon River trap were calculated. Statistical analysis of the 2003 data detected a significant relation between migration rate and Lower Granite Reservoir inflow discharge for hatchery Chinook salmon, wild Chinook salmon and hatchery steelhead trout. Not enough data were available to perform the analysis for wild steelhead trout. Migration rate increased 14-fold for hatchery Chinook salmon, 8.3-fold for wild Chinook salmon and 2.4-fold for hatchery steelhead as discharge increased between 50 kcfs and

Buettner, Edwin W.; Putnam, Scott A. [Idaho Department of Fish and Game

2009-02-18T23:59:59.000Z

373

Exactness of the original Grover search algorithm  

Science Conference Proceedings (OSTI)

It is well-known that when searching one out of four, the original Grover's search algorithm is exact; that is, it succeeds with certainty. It is natural to ask the inverse question: If we are not searching one out of four, is Grover's algorithm definitely not exact? In this article we give a complete answer to this question through some rationality results of trigonometric functions.

Diao Zijian [Mathematics Department, Ohio University Eastern Campus, St. Clairsville, Ohio 43950 (United States)

2010-10-15T23:59:59.000Z

374

Asynchronous parallel generating set search for linearly-constrained optimization.  

SciTech Connect

Generating set search (GSS) is a family of direct search methods that encompasses generalized pattern search and related methods. We describe an algorithm for asynchronous linearly-constrained GSS, which has some complexities that make it different from both the asynchronous bound-constrained case as well as the synchronous linearly-constrained case. The algorithm has been implemented in the APPSPACK software framework and we present results from an extensive numerical study using CUTEr test problems. We discuss the results, both positive and negative, and conclude that GSS is a reliable method for solving small-to-medium sized linearly-constrained optimization problems without derivatives.

Lewis, Robert Michael (; ); Griffin, Joshua D.; Kolda, Tamara Gibson

2006-08-01T23:59:59.000Z

375

Third-Generation Solar Cells Using Optical Rectenna  

compete with fossil fuels (Payback time of about 5-7 years). The second generation of solar cells focuses on low production costs using thin film cells, which resulted in much lower efficiency rates. The third generation of solar cells has not yet ...

376

Steam generator support system  

SciTech Connect

A support system for connection to an outer surface of a J-shaped steam generator for use with a nuclear reactor or other liquid metal cooled power source. The J-shaped steam generator is mounted with the bent portion at the bottom. An arrangement of elongated rod members provides both horizontal and vertical support for the steam generator. The rod members are interconnected to the steam generator assembly and a support structure in a manner which provides for thermal distortion of the steam generator without the transfer of bending moments to the support structure and in a like manner substantially minimizes forces being transferred between the support structure and the steam generator as a result of seismic disturbances.

Moldenhauer, James E. (Simi Valley, CA)

1987-01-01T23:59:59.000Z

377

Steam generator designs  

SciTech Connect

A combined cycle is any one of combinations of gas turbines, steam generators or heat recovery equipment, and steam turbines assembled for the reduction in plant cost or improvement of cycle efficiency in the utility power generation process. The variety of combined cycles discussed for the possibilities for industrial applications include gas turbine plus unfired steam generator; gas turbine plus supplementary fired steam generator; gas turbine plus furnace-fired steam generator; and supercharged furnace-fired system generator plus gas turbine. These units are large enough to meet the demands for the utility applications and with the advent of economical coal gasification processes to provide clean fuel, the combined-cycle applications are solicited. (MCW)

Clayton, W.H.; Singer, J.G.

1973-07-01T23:59:59.000Z

378

Steam generator support system  

DOE Patents (OSTI)

A support system for connection to an outer surface of a J-shaped steam generator for use with a nuclear reactor or other liquid metal cooled power source is disclosed. The J-shaped steam generator is mounted with the bent portion at the bottom. An arrangement of elongated rod members provides both horizontal and vertical support for the steam generator. The rod members are interconnected to the steam generator assembly and a support structure in a manner which provides for thermal distortion of the steam generator without the transfer of bending moments to the support structure and in a like manner substantially minimizes forces being transferred between the support structure and the steam generator as a result of seismic disturbances. 4 figs.

Moldenhauer, J.E.

1987-08-25T23:59:59.000Z

379

Method of grid generation  

DOE Patents (OSTI)

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.

Barnette, Daniel W. (Veguita, NM)

2002-01-01T23:59:59.000Z

380

generation | OpenEI  

Open Energy Info (EERE)

generation generation Dataset Summary Description This dataset comes from the Energy Information Administration (EIA), and is part of the 2011 Annual Energy Outlook Report (AEO2011). This dataset is table 16, and contains only the reference case. Source EIA Date Released April 26th, 2011 (3 years ago) Date Updated Unknown Keywords AEO generation renewable energy renewable energy generating capacity Data application/vnd.ms-excel icon AEO2011: Renewable Energy Generating Capacity and Generation- Reference Case (xls, 118.9 KiB) Quality Metrics Level of Review Peer Reviewed Comment Temporal and Spatial Coverage Frequency Annually Time Period 2008-2035 License License Open Data Commons Public Domain Dedication and Licence (PDDL) Comment Rate this dataset Usefulness of the metadata

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


381

EIA - Annual Energy Outlook 2008 (Early Release)-Electricity Generation  

Gasoline and Diesel Fuel Update (EIA)

Electricity Generation Electricity Generation Annual Energy Outlook 2008 (Early Release) Electricity Generation U.S. electricity consumption—including both purchases from electric power producers and on-site generation—increases steadily in the AEO2008 reference case, at an average rate of 1.3 percent per year. In comparison, electricity consumption grew by annual rates of 4.2 percent, 2.6 percent, and 2.3 percent in the 1970s, 1980s, and 1990s, respectively. The growth rate in the AEO2008 projection is lower than in the AEO2007 reference case (1.5 percent per year), and it leads to lower projections of electricity generation. Figure 4. Electricity generation by fuel, 1980-2030 (billion kilowatthours). Need help, contact the National Energy Information Center at 202-586-8800.

382

Unprecedented Generation Shifts  

Science Conference Proceedings (OSTI)

The economic recession, which reduced electricity demand, and falling natural gas costs have brought about unprecedented shifts in electric generation. These developments have affected coal-fired generation the most, leading to operational challenges (cycling and shut downs), deterioration of financial performance, and an awareness of the vulnerability of many units to retirement. A third force, though usually affecting natural gas unit operations more than coal, is the build-up of wind generation. This ...

2010-12-31T23:59:59.000Z

383

Controlled generation of hard and easy Bayesian networks: Impact on maximal clique size in tree clustering  

Science Conference Proceedings (OSTI)

This article presents and analyzes algorithms that systematically generate random Bayesian networks of varying difficulty levels, with respect to inference using tree clustering. The results are relevant to research on efficient Bayesian network inference, ... Keywords: Bayesian networks, C/V-ratio, Controlled experiments, Maximal clique size, Probabilistic reasoning, Random generation, Tree clustering inference

Ole J. Mengshoel; David C. Wilkins; Dan Roth

2006-11-01T23:59:59.000Z

384

Optimal Sizing of a Stand-alone Wind/Photovoltaic Generation Unit using Particle Swarm Optimization  

Science Conference Proceedings (OSTI)

A hybrid wind/photovoltaic generation system is designed to supply power demand. The aim of this design is minimization of the overall cost of the generation scheme over 20 years of operation. Full demand supply is modeled as constraint for optimization ... Keywords: genetic algorithm, optimal sizing, particle swarm optimization, photovoltaic, wind energy

Ali Kashefi Kaviani; Hamid Reza Baghaee; Gholam Hossein Riahy

2009-02-01T23:59:59.000Z

385

Optimal study of distributed generation impact on electrical distribution networks using GA and generalized reduced gradient  

Science Conference Proceedings (OSTI)

This paper presents the effect of Distributed Generators (DG) existence in the electrical power distribution networks taking IEEE 14 and IEEE 30 bus test feeders as proposed systems. The analysis is done to examine the effect on the overall system losses ... Keywords: IEEE 14 bus system, IEEE 30 bus system and optimization, distributed generator (DG), generalized reduced gradient (GRG), genetic algorithms (GA)

Samuel Raafat Fahim; Walid Helmy; Hany M. Hasanien; M. A. L. Badr

2011-03-01T23:59:59.000Z

386

Unbalanced Load Flow for Weakly Meshed Distribution Systems with Distributed Generation  

Science Conference Proceedings (OSTI)

Distributed Generation (DG) can bring support to distribution system, meanwhile, it bring unbalancedness in power source, load and line. Traditional load flow algorithms are not applicable to the weakly meshed distribution system with DGs. First, this ... Keywords: weakly meshed distribution system, distributed generation, unbalanced load flow, sensitivity compensation

Shao-Qiang Hu; Sen-Mao Li

2010-06-01T23:59:59.000Z

387

Test-case generation for embedded simulink via formal concept analysis  

Science Conference Proceedings (OSTI)

Mutation testing suffers from the high computational cost of automated test-vector generation, due to the large number of mutants that can be derived from programs and the cost of generating test-cases in a white-box manner. We propose a novel algorithm ... Keywords: embedded systems, formal concept analysis, mutation testing, simulink

Nannan He; Philipp Rümmer; Daniel Kroening

2011-06-01T23:59:59.000Z

388

Flexible, extensible, open-source and affordable FPGA-based traffic generator  

Science Conference Proceedings (OSTI)

As high-speed links become ubiquitous in current networks, testing new algorithms at high speed is essential for researchers. This task often makes it necessary to generate traffic with some specified features : distribution of packet sizes, payload ... Keywords: FPGA, NetFPGA 10G, combo, flexible, open-source, traffic generator

Tristan Groléat; Matthieu Arzel; Sandrine Vaton; Alban Bourge; Yannick Le Balch; Hicham Bougdal; Manuel Aranaz Padron

2013-06-01T23:59:59.000Z

389

WIPP Gas-Generation Experiments  

DOE Green Energy (OSTI)

An experimental investigation was conducted for gas generation in contact-handled transuranic (CH TRU) wastes subjected for several years to conditions similar to those expected to occur at the Waste Isolation Pilot Plant (WIPP) should the repository eventually become inundated with brine. Various types of actual CH TRU wastes were placed into 12 corrosion-resistant vessels. The vessels were loosely filled with the wastes, which were submerged in synthetic brine having the same chemical composition as that in the WIPP vicinity. The vessels were also inoculated with microbes found in the Salado Formation at WIPP. The vessels were sealed, purged, and the approximately 750 ml headspace in each vessel was pressurized with nitrogen gas to approximately 146 atmospheres to create anoxic conditions at the lithostatic pressure estimated in the repository were it to be inundated. The temperature was maintained at the expected 30°C. The test program objective was to measure the quantities and species of gases generated by metal corrosion, radiolysis, and microbial activity. These data will assist in the specification of the rates at which gases are produced under inundated repository conditions for use in the WIPP Performance Assessment computer models. These experiments were very carefully designed, constructed, instrumented, and performed. Approximately 6 1/2 years of continuous, undisturbed testing were accumulated. Several of the vessels showed significantly elevated levels of generated gases, virtually all of which was hydrogen. Up to 4.2% hydrogen, by volume, was measured. Only small quantities of other gases, principally carbon dioxide, were detected. Gas generation was found to depend strongly on the waste composition. The maximum hydrogen generation occurred in vessels containing carbon steel. Visual examination of carbon-steel coupons confirmed the correspondence between the extent of observable corrosion and hydrogen generation. Average corrosion penetration rates in carbon-steel of up to 2.3 microns per year were deduced. Conversion of carbon to carbon dioxide was calculated to be as high as 4.7 µg mol/yr/g carbon. Carbon monoxide was detected in only two waste compositions, and methane was detected in only one. In all three of these cases, the concentrations of these lesser gases detected were barely above the detection limits. No hydrogen sulfide was ever detected. Initial rates of hydrogen generation measured in the carbon-steel-bearing wastes during the first year of testing did not always correspond to rates measured over the longer term. Compared to the long-term trends, the initial gas-generation rates for some waste types were higher, for some lower, and for others remained constant. Although carbon-steel corrosion was clearly the dominant hydrogen generator, the rates of generation were found to be reduced in test vessels where the same quantity of carbon steel was co-mingled with other waste types. This is a beneficial phenomenon relative to performance of the WIPP repository. Statistical analyses of the results were made to quantify these negative interaction effects. Electron microscopy analyses of the carbon-steel coupons revealed that corrosion products were predominantly iron chlorides and oxides. Iron, chlorine, oxygen, uranium, magnesium, calcium, aluminum, silicon were all present in the corrosion products. No americium nor neptunium, both present in the wastes, were detected in any of the corrosion products. All

Frank S. Felicione; Steven M. Frank; Dennis D. Keiser

2007-05-01T23:59:59.000Z

390

Steam generator replacement overview  

Science Conference Proceedings (OSTI)

Since nuclear power began to be widely used for commercial purposes in the 1960s, unit operators have experienced a variety of problems with major components. Although many of the problems have diminished considerably, those associated with pressurized water reactor (PWR) steam generators persist. Steam generator problems rank second, behind refueling outages, as the most significant contributor to lost electricity generation. As of December 31, 1995, 38 steam generators had been replaced in 13 of the 72 operating PWRs, and three units had been shut down prematurely, due primarily (or partially) to degradation of their steam generators: Portland General Electric`s Trojan unit, located in Prescott, OR, in 1992; Southern California Edison`s San Onofre 1, located in San Clemente, CA, in 1992; and Sacramento Municipal Utility District`s Rancho Seco unit in 1989. In the coming years, operators of PWRs in the US with degraded steam generators will have to decide whether to make annual repairs (with eventual derating likely), replace the generators or shut the plants down prematurely. To understand the issues and decisions utility managers face, this article examines problems encountered at steam generators over the past few decades and identifies some of the remedies that utility operators and the nuclear community have employed, including operational changes, maintenance, repairs and steam generator replacement.

Chernoff, H. [Science Applications International Corp., McLean, VA (United States); Wade, K.C. [USDOE Energy Information Administration, Washington, DC (United States)

1996-01-01T23:59:59.000Z

391

Next Generation Neural Implants  

Science Conference Proceedings (OSTI)

... They are still bulky, rigid, power hungry, and functionally limited. ... This talk will review progress on next generation implants, which must be miniature ...

2010-10-05T23:59:59.000Z

392

Next Generation Test Bed  

Science Conference Proceedings (OSTI)

... 3 machine rooms (safety, security, power, & A/C). Supports COOP ... ii. Developing methods and technologies for next generation biometric testing. ...

2011-12-15T23:59:59.000Z

393

Isolated trigger pulse generator  

DOE Patents (OSTI)

A trigger pulse generation system capable of delivering a multiplicity of isolated 100 kV trigger pulses with picosecond simultaneity. 2 figs.

Aaland, K.

1980-02-19T23:59:59.000Z

394

EIA - Electricity Generating Capacity  

U.S. Energy Information Administration (EIA) Indexed Site

imports and exports. Renewable & Alternative Fuels Includes hydropower, solar, wind, geothermal, biomass and ethanol. Nuclear & Uranium Uranium fuel, nuclear reactors, generation,...

395

Generator backup overcurrent protection  

Science Conference Proceedings (OSTI)

A concern that the characteristics and correct application of the generator backup relay are misunderstood is addressed in this report to the Power Systems Protection Committee. It is inherently a secure device, and rarely has the opportunity to operate in its intended capacity. So the question was asked, ''Do generator backup overcurrent relays really protect anything.'' In response a description of the function and operating characteristics of the backup relays, a discussion of generator fault current behavior, examples of relay settings for a typical application, and methods and criteria for determining that the relay both protects the generator and operates selectively with other protective devices are included.

Baker, D.S.

1982-11-01T23:59:59.000Z

396

Radioisotope Power Generation  

NLE Websites -- All DOE Office Websites (Extended Search)

Radioisotope Power Generation Long lived power sources are needed for equipment that is too remote or inaccessible for replacement. By choosing a radioactive element with a long...

397

New Generation of MJTCs  

Science Conference Proceedings (OSTI)

... After years of effort and scores of iterations, PML researchers have developed a new generation of devices that can reduce the uncertainties in ac ...

2013-06-24T23:59:59.000Z

398

Generation IV Program  

NLE Websites -- All DOE Office Websites (Extended Search)

an international initiative. A group of ten nations, including France, Japan, Russia, Korea, China, and Canada, are participating in the planning and development of Generation IV...

399

SRS Recovery Act Completes Major Lower Three Runs Project Cleanup |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

SRS Recovery Act Completes Major Lower Three Runs Project Cleanup SRS Recovery Act Completes Major Lower Three Runs Project Cleanup SRS Recovery Act Completes Major Lower Three Runs Project Cleanup American Recovery and Reinvestment Act can now claim that 85 percent of the Savannah River Site (SRS) has been cleaned up with the recent completion of the Lower Three Runs (stream) Project. Twenty miles long, Lower Three Runs leaves the main body of the 310-square mile site and runs through parts of Barnwell and Allendale Counties until it flows into the Savannah River. Government property on both sides of the stream acts as a buffer as it runs through privately-owned property. Completing this project reduces the site's footprint by another 10 percent. SRS Recovery Act Completes Major Lower Three Runs Project Cleanup More Documents & Publications

400

SRS Recovery Act Completes Major Lower Three Runs Project Cleanup |  

Energy.gov (U.S. Department of Energy (DOE)) Indexed Site

SRS Recovery Act Completes Major Lower Three Runs Project Cleanup SRS Recovery Act Completes Major Lower Three Runs Project Cleanup SRS Recovery Act Completes Major Lower Three Runs Project Cleanup American Recovery and Reinvestment Act can now claim that 85 percent of the Savannah River Site (SRS) has been cleaned up with the recent completion of the Lower Three Runs (stream) Project. Twenty miles long, Lower Three Runs leaves the main body of the 310-square mile site and runs through parts of Barnwell and Allendale Counties until it flows into the Savannah River. Government property on both sides of the stream acts as a buffer as it runs through privately-owned property. Completing this project reduces the site's footprint by another 10 percent. SRS Recovery Act Completes Major Lower Three Runs Project Cleanup More Documents & Publications

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


401

Fast fluidized bed steam generator  

DOE Patents (OSTI)

A steam generator in which a high-velocity, combustion-supporting gas is passed through a bed of particulate material to provide a fluidized bed having a dense-phase portion and an entrained-phase portion for the combustion of fuel material. A first set of heat transfer elements connected to a steam drum is vertically disposed above the dense-phase fluidized bed to form a first flow circuit for heat transfer fluid which is heated primarily by the entrained-phase fluidized bed. A second set of heat transfer elements connected to the steam drum and forming the wall structure of the furnace provides a second flow circuit for the heat transfer fluid, the lower portion of which is heated by the dense-phase fluidized bed and the upper portion by the entrained-phase fluidized bed.

Bryers, Richard W. (Flemington, NJ); Taylor, Thomas E. (Bergenfield, NJ)

1980-01-01T23:59:59.000Z

402

Sphere Lower Bound for Rotated Lattice Constellations in Fading Channels  

E-Print Network (OSTI)

We study the error probability performance of rotated lattice constellations in frequency-flat Nakagami-$m$ block-fading channels. In particular, we use the sphere lower bound on the underlying infinite lattice as a performance benchmark. We show that the sphere lower bound has full diversity. We observe that optimally rotated lattices with largest known minimum product distance perform very close to the lower bound, while the ensemble of random rotations is shown to lack diversity and perform far from it.

Fabregas, Albert Guillen i

2007-01-01T23:59:59.000Z

403

On Lower Complexity Bounds for Large-Scale Smooth Convex ...  

E-Print Network (OSTI)

where the right hand side infinum is taken over all k-step solution algorithms M utilizing ... standard reference on information-based complexity of various broad ..... magnitude of the quantities ??i,x1? and specify ?1 ? {?1; 1} in such a way that ...

404

Novel Combination of Enzyme Systems Could Lower Biofuel Costs...  

NLE Websites -- All DOE Office Websites (Extended Search)

NRELFS-2700-58559 | July 2013 Novel Combination of Enzyme Systems Could Lower Biofuel Costs Highlights in Science Two biomass-degrading enzyme systems that work in very...

405

Lower 48 Federal Offshore Natural Gas Liquids Lease Condensate...  

U.S. Energy Information Administration (EIA) Indexed Site

Lease Condensate, Proved Reserves (Million Barrels) Lower 48 Federal Offshore Natural Gas Liquids Lease Condensate, Proved Reserves (Million Barrels) Decade Year-0 Year-1...

406

Lower 48 States Natural Gas Plant Liquids, Proved Reserves (Million...  

Annual Energy Outlook 2012 (EIA)

company data. Release Date: 812013 Next Release Date: 812014 Referring Pages: Natural Gas Liquids Proved Reserves as of Dec. 31 Lower 48 States Natural Gas Liquids Proved...

407

Demand response can lower electric power load when needed - Today ...  

U.S. Energy Information Administration (EIA)

February 15, 2011 Demand response can lower electric power load when needed . Consumers can play a major role in ensuring reliable electricity supply by reducing ...

408

,"Lower 48 Federal Offshore Natural Gas Plant Liquids, Proved...  

U.S. Energy Information Administration (EIA) Indexed Site

Of Series","Frequency","Latest Data for" ,"Data 1","Lower 48 Federal Offshore Natural Gas Plant Liquids, Proved Reserves (Million Barrels)",1,"Annual",2011...

409

Lower 48 Federal Offshore Natural Gas Liquids Lease Condensate...  

Gasoline and Diesel Fuel Update (EIA)

Reserves Based Production (Million Barrels) Lower 48 Federal Offshore Natural Gas Liquids Lease Condensate, Reserves Based Production (Million Barrels) Decade Year-0 Year-1 Year-2...

410

,"Lower 48 Federal Offshore Natural Gas Liquids Lease Condensate...  

U.S. Energy Information Administration (EIA) Indexed Site

Of Series","Frequency","Latest Data for" ,"Data 1","Lower 48 Federal Offshore Natural Gas Liquids Lease Condensate, Proved Reserves (Million Barrels)",1,"Annual",2...

411

Lower 48 States Total Natural Gas Underground Storage Capacity...  

U.S. Energy Information Administration (EIA) Indexed Site

data. Release Date: 9302013 Next Release Date: 10312013 Referring Pages: Total Natural Gas Underground Storage Capacity Lower 48 States Underground Natural Gas Storage Capacity...

412

Available Technologies: Lower Cost Lithium Ion Batteries from ...  

Lower Cost Lithium Ion Batteries from ... Although lithium ion batteries are the most promising candidates for plug-in hybrid electric vehicles, the u ...

413

Lower 48 States Crude Oil Reserves in Nonproducing Reservoirs...  

Gasoline and Diesel Fuel Update (EIA)

Reserves in Nonproducing Reservoirs (Million Barrels) Lower 48 States Crude Oil Reserves in Nonproducing Reservoirs (Million Barrels) Decade Year-0 Year-1 Year-2 Year-3 Year-4...

414

STEADY-STATE FLAMMABLE GAS RELEASE RATE CALCULATION AND LOWER FLAMMABILITY LEVEL EVALUATION FOR HANFORD TANK WASTE  

SciTech Connect

Assess the steady-state flammability level at normal and off-normal ventilation conditions. The methodology of flammability analysis for Hanford tank waste is developed. The hydrogen generation rate model was applied to calculate the gas generation rate for 177 tanks. Flammability concentrations and the time to reach 25% and 100% of the lower flammability limit, and the minimum ventilation rate to keep from 100 of the LFL are calculated for 177 tanks at various scenarios.

HU TA

2007-10-26T23:59:59.000Z

415

JMLUnit: the next generation  

Science Conference Proceedings (OSTI)

Designing unit test suites for object-oriented systems is a painstaking, repetitive, and error-prone task, and significant research has been devoted to the automatic generation of test suites. One method for generating unit tests is to use formal class ...

Daniel M. Zimmerman; Rinkesh Nagmoti

2010-06-01T23:59:59.000Z

416

Laser beam generating apparatus  

DOE Patents (OSTI)

Laser beam generating apparatus including a septum segment disposed longitudinally within the tubular structure of the apparatus. The septum provides for radiatively dissipating heat buildup within the tubular structure and for generating relatively uniform laser beam pulses so as to minimize or eliminate radial pulse delays (the chevron effect). 11 figures.

Warner, B.E.; Duncan, D.B.

1993-12-28T23:59:59.000Z

417

Laser beam generating apparatus  

DOE Patents (OSTI)

Laser beam generating apparatus including a septum segment disposed longitudinally within the tubular structure of the apparatus. The septum provides for radiatively dissipating heat buildup within the tubular structure and for generating relatively uniform laser beam pulses so as to minimize or eliminate radial pulse delays (the chevron effect).

Warner, Bruce E. (Livermore, CA); Duncan, David B. (Auburn, CA)

1994-01-01T23:59:59.000Z

418

Laser beam generating apparatus  

DOE Patents (OSTI)

Laser beam generating apparatus including a septum segment disposed longitudinally within the tubular structure of the apparatus is described. The septum provides for radiatively dissipating heat buildup within the tubular structure and for generating relatively uniform laser beam pulses so as to minimize or eliminate radial pulse delays (the chevron effect). 7 figures.

Warner, B.E.; Duncan, D.B.

1994-02-15T23:59:59.000Z

419

Laser beam generating apparatus  

DOE Patents (OSTI)

Laser beam generating apparatus including a septum segment disposed longitudinally within the tubular structure of the apparatus. The septum provides for radiatively dissipating heat buildup within the tubular structure and for generating relatively uniform laser beam pulses so as to minimize or eliminate radial pulse delays (the chevron effect).

Warner, Bruce E. (Livermore, CA); Duncan, David B. (Auburn, CA)

1993-01-01T23:59:59.000Z

420

Kivalina wind generator  

Science Conference Proceedings (OSTI)

The project reported was to construct a system to harness the winds of an Arctic site to generate electricity that would power a greenhouse where fruit and vegetables could be raised for local consumption. The installation of the tower and an Enertech 4K wind generator are described. (LEW)

Aldrich, D.

1984-02-18T23:59:59.000Z

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


421

Internal split field generator  

DOE Patents (OSTI)

A generator includes a coil of conductive material. A stationary magnetic field source applies a stationary magnetic field to the coil. An internal magnetic field source is disposed within a cavity of the coil to apply a moving magnetic field to the coil. The stationary magnetic field interacts with the moving magnetic field to generate an electrical energy in the coil.

Thundat; ,Thomas George (Knoxville, TN); Van Neste, Charles W. (Kingston, TN); Vass, Arpad Alexander (Oak Ridge, TN)

2012-01-03T23:59:59.000Z

422

Numerical Generation of Entropies  

Science Conference Proceedings (OSTI)

The spurious numerical generation and/or destruction of various types of entropies in models is investigated. It is shown that entropy s? of dry matter tends to be generated if potential temperature is advected by a damping scheme. There is no ...

Joseph Egger

1999-09-01T23:59:59.000Z

423

Generative model transformer  

Science Conference Proceedings (OSTI)

The Generative Model Transformer (GMT) project is an Open Source initiative to build a Model Driven Architecure™ tool that allows fully customisable Platform Independent Models, Platform Description Models, Texture Mappings, and Refinement Transformations. ... Keywords: QVT, domain-specific languages, generative model transformer (GMT), model driven architecture (MDA), model transformation, open source

Jorn Bettin; Ghica van Emde Boas

2003-10-01T23:59:59.000Z

424

Solid aerosol generator  

DOE Patents (OSTI)

An improved solid aerosol generator used to produce a gas borne stream of dry, solid particles of predetermined size and concentration. The improved solid aerosol generator nebulizes a feed solution of known concentration with a flow of preheated gas and dries the resultant wet heated aerosol in a grounded, conical heating chamber, achieving high recovery and flow rates.

Prescott, Donald S. (Shelley, ID); Schober, Robert K. (Midwest City, OK); Beller, John (Idaho Falls, ID)

1992-01-01T23:59:59.000Z

425

Invariant generation in vampire  

Science Conference Proceedings (OSTI)

This paper describes a loop invariant generator implemented in the theorem prover Vampire. It is based on the symbol elimination method proposed by two authors of this paper. The generator accepts a program written in a subset of C, finds loops in it, ...

Kryštof Hoder; Laura Kovács; Andrei Voronkov

2011-03-01T23:59:59.000Z

426

An Experimental Method for the Active Learning of Greedy Algorithms  

Science Conference Proceedings (OSTI)

Greedy algorithms constitute an apparently simple algorithm design technique, but its learning goals are not simple to achieve. We present a didactic method aimed at promoting active learning of greedy algorithms. The method is focused on the concept ... Keywords: Computer science education, active learning, greedy algorithms, misconceptions, usability, visualization

J. Ángel Velázquez-Iturbide

2013-11-01T23:59:59.000Z

427

Automatic recommendation of classification algorithms based on data set characteristics  

Science Conference Proceedings (OSTI)

Choosing appropriate classification algorithms for a given data set is very important and useful in practice but also is full of challenges. In this paper, a method of recommending classification algorithms is proposed. Firstly the feature vectors of ... Keywords: Algorithm performance, Classification, Classification algorithm automatic recommendation, Data set characteristics extraction, k-Nearest Neighbors

Qinbao Song; Guangtao Wang; Chao Wang

2012-07-01T23:59:59.000Z

428

An evolutive algorithm for wind farm optimal design  

Science Conference Proceedings (OSTI)

An evolutive algorithm for the optimal design of wind farms is presented. The algorithm objective is to optimize the profits given an investment on a wind farm. Net present value will be used as a figure of the revenue. To work out this figure, several ... Keywords: Evolutive algorithm, Genetic algorithm, Optimization, Wind farms

José Castro Mora; José M. Calero Barón; Jesús M. Riquelme Santos; Manuel Burgos Payán

2007-10-01T23:59:59.000Z

429

Automated Configuration of Algorithms for Solving Hard Computational Problems  

E-Print Network (OSTI)

Automated Configuration of Algorithms for Solving Hard Computational Problems by Frank Hutter Dipl-performing algorithms for many hard problems are highly parameterized. Selecting the best heuristics and tuning studies the automation of this important part of algorithm design: the configuration of discrete algorithm

Hutter, Frank

430

Small-Scale Motions Observed by Aircraft in the Tropical Lower Stratosphere: Evidence for Mixing and its Relationship to Large-Scale Flows  

Science Conference Proceedings (OSTI)

Measurments of temperature and ozone from instrumental aircraft in the tropical lower stratosphere show the presence of small-scale disturbances generated by 1) underlying cumulus convection and 2) Kelvin-Helmholtz instability. The disturbances ...

Leonhard Pfister; Walter Starr; Roger Craig; Max Loewenstein; Marion Legg

1986-12-01T23:59:59.000Z

431

Incorporating Wind Generation in Cap and Trade Programs  

DOE Green Energy (OSTI)

Cap and trade programs are increasingly being used to reduce emissions from electricity generation in the United States. Cap and trade programs primarily target emitting generators, but programs have also included renewable generators, such as wind generators. States cite several reasons why they have considered the policy option of including renewable generators in cap and trade programs: to provide an incentive for lower-emitting generation, to achieve emissions reductions in non-capped pollutants, and to gain local economic benefits associated with renewable energy projects. The U.S. Environmental Protection Agency also notes these rationales for considering this policy alternative, and the National Association of Regulatory Commissioners (NARUC) passed a resolution supporting the inclusion of renewable energy in cap and trade programs. This report explores why states consider this policy option, what participation could mean for wind generators, and how wind generation can most effectively be included in state, federal, and regional cap and trade programs.

Bluestein, J.; Salerno, E.; Bird, L.; Vimmerstedt, L.

2006-07-01T23:59:59.000Z

432

Reactivity of Acid Generators  

NLE Websites -- All DOE Office Websites (Extended Search)

Reactivity of Acid Generators for Chemically Amplified Resists with Reactivity of Acid Generators for Chemically Amplified Resists with Low-Energy Electrons Atsuro Nakano, Takahiro Kozawa, Seiichi Tagawa, Tomasz Szreder, James F. Wishart, Toshiyuki Kai and Tsutomu Shimokawa Jpn. J. Appl. Phys., 45, L197-L200 (2006). [Find paper at the Japanese Journal of Applied Physics] Abstract: In chemically amplified resists for ionizing radiations such as electron beams and extreme ultraviolet (EUV), low-energy electrons play an important role in the pattern formation processes. The reactivity of acid generators with low-energy electrons was evaluated using solvated electrons in tetrahydrofuran, which were generated by a pulsed electron beam. The rate constants of acid generators with the solvated electrons ranged from 0.6 to 1.9 x 1011 M-1s-1

433

TFTR Motor Generator  

SciTech Connect

A general description is given of 475 MVA pulsed motor generators for TFTR at Princeton Plasma Physics Laboratory. Two identical generators operating in parallel are capable of supplying 950 MVA for an equivalent square pulse of 6.77 seconds and 4,500 MJ at 0.7 power factor to provide the energy for the pulsed electrical coils and heating system for TFTR. The description includes the operational features of the 15,000 HP wound rotor motors driving each generator with its starting equipment and cycloconverter for controlling speed, power factor, and regulating line voltage during load pulsing where the generator speed changes from 87.5 to 60 Hz frequency variation to provide the 4,500 MJ or energy. The special design characteristics such as fatigue stress calculations for 10/sup 6/ cycles of operation, forcing factor on exciter to provide regulation, and low generator impedance are reviewed.

Murray, J.G.; Bronner, G.; Horton, M.

1977-01-01T23:59:59.000Z

434

A robust blind sparse source separation algorithm using genetic algorithm to identify mixing matrix  

Science Conference Proceedings (OSTI)

In this paper, a novel identification of mixing matrix using genetic algorithm (GA) is proposed to deal with the blind sparse source separation (BSS) problem. A preprocessing filters the most of minor mixtures at first, and then represents the remainder ... Keywords: blind source separation (BSS), genetic algorithm (GA), sparse representation, under-determined

Tsung-Ying Sun; Chan-Cheng Liu; Sheng-Ta Hsieh; Shang-Jeng Tsai; Kan-Yuan Li

2007-02-01T23:59:59.000Z

435

A robust blind sparse source separation algorithm using genetic algorithm to identify mixing matrix  

Science Conference Proceedings (OSTI)

In this paper, a novel identification of mixing matrix using genetic algorithm (GA) is proposed to deal with the blind sparse source separation (BSS) problem. A preprocessing filters the most of minor mixtures at first, and then represents the remainder ... Keywords: blind source separation (BSS), genetic algorithm (GA), sparse representation, under-determined

Tsung-Ying Sun; Chan-Cheng Liu; Sheng-Ta Hsieh; Shang-Jeng Tsai; Kan-Yuan Li

2007-01-01T23:59:59.000Z

436

Temporal Reference Algorithms versus Spatial Reference Algorithms forSmart Antennas  

Science Conference Proceedings (OSTI)

This paper compares algorithms from three different classes of adaptation schemes for smart antennas – the switched beam approach, a Temporal-Reference (TR) technique based on Direct Matrix Inversion or Least Squares adaptation, and a Spatial-Reference ... Keywords: adaptation algorithms, angular spread, comparison, mutual coupling, smart antennas

Josef Fuhl; Ernst Bonek

1999-05-01T23:59:59.000Z

437

Using a Genetic Algorithm to Tune a Bounded Weak Echo Region Detection Algorithm  

Science Conference Proceedings (OSTI)

Weather detection algorithms often rely on a simple rule base that is based on several features. Fuzzy logic can be used in the rule base, and the membership functions of the fuzzy sets can be tuned using a search or optimization algorithm that ...

V. Lakshmanan

2000-02-01T23:59:59.000Z

438

FDD Algorithm for an AHU Reverse-Return System  

E-Print Network (OSTI)

A fault detection and diagnosis (FDD) algorithm was developed for an AHU reverse-return system for air cooling. These FDD rules were generated using simulation in three steps. Cause-effect rules were established by connecting the faults and their related effects. The FDD rules were developed for the following faults: old valve, fouled return pipe, fault in the outlet air temperature sensor, fault in the temperature sensor for the inlet temperature, bad position of the sensor for pressure difference. The effects of the involved faults were observed on four system performances. The results showed that increase in both the cooling coil rate and the pump rate appear due to faults in sensors. The inaccurate measurement of the pressure difference and the fault in the control valve do not affect the AHU outlet air temperatures. Increase in both the outlet air temperature and the pump power consumption appears due to the fouled return pipes.

Djuric, N.; Novakovic, V.

2008-10-01T23:59:59.000Z

439

SHALE: An Efficient Algorithm for Allocation of Guaranteed Display Advertising  

E-Print Network (OSTI)

Motivated by the problem of optimizing allocation in guaranteed display advertising, we develop an efficient, lightweight method of generating a compact {\\em allocation plan} that can be used to guide ad server decisions. The plan itself uses just O(1) state per guaranteed contract, is robust to noise, and allows us to serve (provably) nearly optimally. The optimization method we develop is scalable, with a small in-memory footprint, and working in linear time per iteration. It is also "stop-anytime", meaning that time-critical applications can stop early and still get a good serving solution. Thus, it is particularly useful for optimizing the large problems arising in the context of display advertising. We demonstrate the effectiveness of our algorithm using actual Yahoo! data.

Bharadwaj, Vijay; Ma, Wenjing; Nagarajan, Chandrashekhar; Tomlin, John; Vassilvitskii, Sergei; Vee, Erik; Yang, Jian

2012-01-01T23:59:59.000Z

440

Steam Generator Management Program: Steam Generator Progress Report  

Science Conference Proceedings (OSTI)

Since 1985, EPRI has published the Steam Generator Progress Report (SGPR), which provides historical information on worldwide steam generator activities.

2009-10-19T23:59:59.000Z

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


441

Alignment-dependent fluorescence emission induced by tunnel ionization of carbon dioxide from lower-lying orbitals  

E-Print Network (OSTI)

We show that fluorescence emission induced by strong field tunnel ionization of carbon dioxide from its lower-lying orbitals exhibits a peculiar molecular alignment dependence. The experimentally measured alignment-dependence of the fluorescence agrees with the alignment-dependence of the ionization probability calculated in the framework of the strong field approximation. Our results demonstrate the feasibility of an all-optical approach for shedding more light on the ionization mechanisms of molecules from their lower-lying orbitals in tunnel ionization regime.

Yao, Jinping; Jia, Xinyan; Hao, Xiaolei; Zeng, Bin; Jing, Chenrui; Chu, Wei; Ni, Jielei; Zhang, Haisu; Xie, Hongqiang; Zhang, Chaojin; Zhao, Zengxiu; Chen, Jing; Liu, Xiaojun; Cheng, Ya; Xu, Zhizhan

2013-01-01T23:59:59.000Z

442

Lower Columbia Salmon Recovery Fish & Wildlife Subbasin Plan  

E-Print Network (OSTI)

in south central Washington. The basin encompasses approximately 136 square miles and enters the Columbia in a series of volumes that together comprise a Recovery and Subbasin Plan for Washington lower Columbia River Washington lower Columbia River subbasins consistent with the Regional Plan. These volumes describe

443

Factorization law for two lower bounds of concurrence  

SciTech Connect

We study the dynamics of two lower bounds of concurrence in bipartite quantum systems when one party goes through an arbitrary channel. We show that these lower bounds obey the factorization law similar to that of [Konrad et al., Nat. Phys. 4, 99 (2008)]. We also discuss the application of this property in an example.

Mirafzali, Sayyed Yahya; Sargolzahi, Iman; Ahanj, Ali; Javidan, Kurosh; Sarbishaei, Mohsen [Department of Physics, Ferdowsi University of Mashhad, Mashhad (Iran, Islamic Republic of); Khayyam Institute of Higher Education, Mashhad, Iran and School of Physics, Institute for Research in Fundamental Science (IPM), P. O. Box 19395-5531, Tehran (Iran, Islamic Republic of); Department of Physics, Ferdowsi University of Mashhad, Mashhad (Iran, Islamic Republic of)

2010-09-15T23:59:59.000Z

444

Lower bounds on the bounded coefficient complexity of bilinear maps  

Science Conference Proceedings (OSTI)

We prove lower bounds of order n log n for both the problem of multiplying polynomials of degree n, and of dividing polynomials with remainder, in the model of bounded coefficient arithmetic circuits over the complex numbers. These ... Keywords: Algebraic complexity, bilinear circuits, lower bounds, singular values

Peter Bürgisser; Martin Lotz

2004-05-01T23:59:59.000Z

445

Lower Merion a Key Player in Alternative Fuel Buses  

DOE Green Energy (OSTI)

This 2-page Clean Cities fact sheet describes the use of natural gas power in buses by the Lower Merion School District, located in the western suburbs of Philadelphia, PA. It includes information on the history of the program, along with contact information for the local Clean Cities Coordinator and Lower Merion School District.

Not Available

2004-04-01T23:59:59.000Z

446

The Iron Spin Transition in the Earth's Lower Mantle  

NLE Websites -- All DOE Office Websites (Extended Search)

The Iron Spin Transition in the Earth's Lower Mantle Print The Iron Spin Transition in the Earth's Lower Mantle Print It is now known that the iron present in minerals of the lower mantle of the Earth undergoes a pressure-induced transition with pairing of the spins of its 3d electrons. A team from the University of California, Berkeley, Tel Aviv University, and Lawrence Livermore National Laboratory has used x-ray diffraction at very high pressure to investigate the effects of this transition on the elastic properties of magnesiowüstite (Mg1-xFex)O, the second most abundant mineral in the Earth's lower mantle. The new results suggest that the effect of the spin-pairing transition on magnesiowüstite can be large enough to require a partial revision of the most accepted model of the lower mantle composition.

447

The Iron Spin Transition in the Earth's Lower Mantle  

NLE Websites -- All DOE Office Websites (Extended Search)

The Iron Spin Transition in the Earth's Lower Mantle Print The Iron Spin Transition in the Earth's Lower Mantle Print It is now known that the iron present in minerals of the lower mantle of the Earth undergoes a pressure-induced transition with pairing of the spins of its 3d electrons. A team from the University of California, Berkeley, Tel Aviv University, and Lawrence Livermore National Laboratory has used x-ray diffraction at very high pressure to investigate the effects of this transition on the elastic properties of magnesiowüstite (Mg1-xFex)O, the second most abundant mineral in the Earth's lower mantle. The new results suggest that the effect of the spin-pairing transition on magnesiowüstite can be large enough to require a partial revision of the most accepted model of the lower mantle composition.

448

The Iron Spin Transition in the Earth's Lower Mantle  

NLE Websites -- All DOE Office Websites (Extended Search)

The Iron Spin Transition in the The Iron Spin Transition in the Earth's Lower Mantle The Iron Spin Transition in the Earth's Lower Mantle Print Wednesday, 30 April 2008 00:00 It is now known that the iron present in minerals of the lower mantle of the Earth undergoes a pressure-induced transition with pairing of the spins of its 3d electrons. A team from the University of California, Berkeley, Tel Aviv University, and Lawrence Livermore National Laboratory has used x-ray diffraction at very high pressure to investigate the effects of this transition on the elastic properties of magnesiowüstite (Mg1-xFex)O, the second most abundant mineral in the Earth's lower mantle. The new results suggest that the effect of the spin-pairing transition on magnesiowüstite can be large enough to require a partial revision of the most accepted model of the lower mantle composition.

449

The Iron Spin Transition in the Earth's Lower Mantle  

NLE Websites -- All DOE Office Websites (Extended Search)

The Iron Spin Transition in the Earth's Lower Mantle Print The Iron Spin Transition in the Earth's Lower Mantle Print It is now known that the iron present in minerals of the lower mantle of the Earth undergoes a pressure-induced transition with pairing of the spins of its 3d electrons. A team from the University of California, Berkeley, Tel Aviv University, and Lawrence Livermore National Laboratory has used x-ray diffraction at very high pressure to investigate the effects of this transition on the elastic properties of magnesiowüstite (Mg1-xFex)O, the second most abundant mineral in the Earth's lower mantle. The new results suggest that the effect of the spin-pairing transition on magnesiowüstite can be large enough to require a partial revision of the most accepted model of the lower mantle composition.

450

Algorithms for Marketing-Mix Optimization  

E-Print Network (OSTI)

Algorithms for determining quality/cost/price tradeoffs in saturated markets are considered. A product is modeled by $d$ real-valued qualities whose sum determines the unit cost of producing the product. This leads to the following optimization problem: given a set of $n$ customers, each of whom has certain minimum quality requirements and a maximum price they are willing to pay, design a new product and select a price for that product in order to maximize the resulting profit. An $O(n\\log n)$ time algorithm is given for the case, $d=1$, of linear products, and $O(n(\\log n)^{d+1})$ time approximation algorithms are given for products with any constant number, $d$, of qualities. To achieve the latter result, an $O(nk^{d-1})$ bound on the complexity of an arrangement of homothetic simplices in $\\R^d$ is given, where $k$ is the maximum number of simplices that all contain a single points.

Gudmundsson, Joachim; Smid, Michiel

2009-01-01T23:59:59.000Z

451

Hydrogen Generation From Electrolysis  

SciTech Connect

Small-scale (100-500 kg H2/day) electrolysis is an important step in increasing the use of hydrogen as fuel. Until there is a large population of hydrogen fueled vehicles, the smaller production systems will be the most cost-effective. Performing conceptual designs and analyses in this size range enables identification of issues and/or opportunities for improvement in approach on the path to 1500 kg H2/day and larger systems. The objectives of this program are to establish the possible pathways to cost effective larger Proton Exchange Membrane (PEM) water electrolysis systems and to identify areas where future research and development efforts have the opportunity for the greatest impact in terms of capital cost reduction and efficiency improvements. System design and analysis was conducted to determine the overall electrolysis system component architecture and develop a life cycle cost estimate. A design trade study identified subsystem components and configurations based on the trade-offs between system efficiency, cost and lifetime. Laboratory testing of components was conducted to optimize performance and decrease cost, and this data was used as input to modeling of system performance and cost. PEM electrolysis has historically been burdened by high capital costs and lower efficiency than required for large-scale hydrogen production. This was known going into the program and solutions to these issues were the focus of the work. The program provided insights to significant cost reduction and efficiency improvement opportunities for PEM electrolysis. The work performed revealed many improvement ideas that when utilized together can make significant progress towards the technical and cost targets of the DOE program. The cell stack capital cost requires reduction to approximately 25% of today’s technology. The pathway to achieve this is through part count reduction, use of thinner membranes, and catalyst loading reduction. Large-scale power supplies are available today that perform in a range of efficiencies, >95%, that are suitable for the overall operational goals. The balance of plant scales well both operationally and in terms of cost becoming a smaller portion of the overall cost equation as the systems get larger. Capital cost reduction of the cell stack power supplies is achievable by modifying the system configuration to have the cell stacks in electrical series driving up the DC bus voltage, thereby allowing the use of large-scale DC power supply technologies. The single power supply approach reduces cost. Elements of the cell stack cost reduction and efficiency improvement work performed in the early stage of the program is being continued in subsequent DOE sponsored programs and through internal investment by Proton. The results of the trade study of the 100 kg H2/day system have established a conceptual platform for design and development of a next generation electrolyzer for Proton. The advancements started by this program have the possibility of being realized in systems for the developing fueling markets in 2010 period.

Steven Cohen; Stephen Porter; Oscar Chow; David Henderson

2009-03-06T23:59:59.000Z

452

HIGH EFFICIENCY SYNGAS GENERATION  

DOE Green Energy (OSTI)

This project investigated an efficient and low cost method of auto-thermally reforming natural gas to hydrogen and carbon monoxide. Reforming is the highest cost step in producing products such as methanol and Fisher Tropsch liquids (i.e., gas to liquids); and reducing the cost of reforming is the key to reducing the cost of these products. Steam reforming is expensive because of the high cost of the high nickel alloy reforming tubes (i.e., indirectly fired reforming tubes). Conventional auto-thermal or Partial Oxidation (POX) reforming minimizes the size and cost of the reformers and provides a near optimum mixture of CO and hydrogen. However POX requires pure oxygen, which consumes power and significantly increases the cost to reforming. Our high efficiency process extracts oxygen from low-pressure air with novel oxygen sorbent and transfers the oxygen to a nickel-catalyzed reformer. The syngas is generated at process pressure (typically 20 to 40 bar) without nitrogen dilution and has a 1CO to 2H{sub 2} ratio that is near optimum for the subsequent production of Fisher-Tropsch liquid to liquids and other chemicals (i.e., Gas to Liquids, GTL). Our high process efficiency comes from the way we transfer the oxygen into the reformer. All of the components of the process, except for the oxygen sorbent, are commonly used in commercial practice. A process based on a longlived, regenerable, oxygen transfer sorbent could substantially reduce the cost of natural gas reforming to syngas. Lower cost syngas (CO + 2H{sub 2}) that is the feedstock for GTL would reduce the cost of GTL and for other commercial applications (e.g., methanol, other organic chemicals). The vast gas resources of Alaska's North Slope (ANS) offer more than 22 Tcf of gas and GTL production in this application alone, and could account for as much as 300,000 to 700,000 bpd for 20 to 30+ years. We developed a new sorbent, which is an essential part of the High Efficiency Oxygen Process (HOP). We tested the sorbent and observed that it has both a good oxygen capacity and operates as a highly effective reforming catalyst. We conducted a long duration tests of the sorbent (1,500 hours of continuous operation in the HOP cycle). Although the sorbent lost some oxygen capacity with cycling, the sorbent oxygen capacity stabilized after 1,000 hours and remained constant to the end of the test, 1,500 hour. The activity of the catalyst to reform methane to a hydrogen and carbon monoxide mixture was unchanged through the oxidation/reduction cycling. Our cost and performance analyses indicated a significant reduction in the cost of GTL production when using the HOP process integrated into a GTL plant.

Robert J. Copeland; Yevgenia Gershanovich; Brian Windecker

2005-02-01T23:59:59.000Z

453

NEXT GENERATION TURBINE SYSTEM STUDY  

DOE Green Energy (OSTI)

Rolls-Royce has completed a preliminary design and marketing study under a Department of Energy (DOE) cost shared contract (DE-AC26-00NT40852) to analyze the feasibility of developing a clean, high efficiency, and flexible Next Generation Turbine (NGT) system to meet the power generation market needs of the year 2007 and beyond. Rolls-Royce evaluated the full range of its most advanced commercial aerospace and aeroderivative engines alongside the special technologies necessary to achieve the aggressive efficiency, performance, emissions, economic, and flexibility targets desired by the DOE. Heavy emphasis was placed on evaluating the technical risks and the economic viability of various concept and technology options available. This was necessary to ensure the resulting advanced NGT system would provide extensive public benefits and significant customer benefits without introducing unacceptable levels of technical and operational risk that would impair the market acceptance of the resulting product. Two advanced cycle configurations were identified as offering significant advantages over current combined cycle products available in the market. In addition, balance of plant (BOP) technologies, as well as capabilities to improve the reliability, availability, and maintainability (RAM) of industrial gas turbine engines, have been identified. A customer focused survey and economic analysis of a proposed Rolls-Royce NGT product configuration was also accomplished as a part of this research study. The proposed Rolls-Royce NGT solution could offer customers clean, flexible power generation systems with very high efficiencies, similar to combined cycle plants, but at a much lower specific cost, similar to those of simple cycle plants.

Frank Macri

2002-02-28T23:59:59.000Z

454

Winning in electricity generation  

SciTech Connect

Should you be a buyer or a seller of generation? In general, spot buyers should do very well, while many generation owners will be fortunate to recover their stranded costs. Successful generators will capitalize on superior operating performance and market knowledge. The smartest natural gas strategy in the early 1980`s was to short natural gas. Will this lesson of restructuring be written again of the electricity generation business of the late 1990`s? The authors will examine whether and how winners might emerge in the generation business of the future. The U.S. electric generation market, already marked by intense competition for new capacity and industrial demand, will become even more competitive as it makes the transition from regulated local monopoly to marketbased commodity pricing. At risk is up to $150 billion of shareholder equity and the future viability of half of the country`s investor-owned utilities. The winners in year 2005 will be those who early on developed strategies that simultaneously recovered existing generation investments while restructuring their asset portfolios and repositioning their plants to compete in the new market. Losers will have spent the time mired in indecision, their strategies ultimately forced upon them by regulators or competitors.

Hashimoto, L. [McKinsey & Co., Los Angeles, CA (United States)] [McKinsey & Co., Los Angeles, CA (United States); Jansen, P. [McKinsey & Co., San Francisco, CA (United States)] [McKinsey & Co., San Francisco, CA (United States); Geyn, G. van [McKinsey & Co., Toronto (Canada)] [McKinsey & Co., Toronto (Canada)

1996-08-01T23:59:59.000Z

455

Spurious source generation in mapping from noisy phase-self-calibrated data  

E-Print Network (OSTI)

Phase self-calibration (or selfcal) is an algorithm often used in the calibration of interferometric observations in astronomy. Although a powerful tool, this algorithm presents strong limitations when applied to data with a low signal-to-noise ratio. We analyze the artifacts that the phase selfcal algorithm produces when applied to extremely noisy data. We show how the phase selfcal may generate a spurious source in the sky from a distribution of completely random visibilities. This spurious source is indistinguishable from a real one. We numerically and analytically compute the relationship between the maximum spurious flux density generated by selfcal from noise and the particulars of the interferometric observations. Finally, we present two simple tests that can be applied to interferometric data for checking whether a source detection is real or whether the source is an artifact of the phase self-calibration algorithm.

I. Marti-Vidal; J. M. Marcaide

2008-01-08T23:59:59.000Z

456

Graph algorithms in the titan toolkit.  

Science Conference Proceedings (OSTI)

Graph algorithms are a key component in a wide variety of intelligence analysis activities. The Graph-Based Informatics for Non-Proliferation and Counter-Terrorism project addresses the critical need of making these graph algorithms accessible to Sandia analysts in a manner that is both intuitive and effective. Specifically we describe the design and implementation of an open source toolkit for doing graph analysis, informatics, and visualization that provides Sandia with novel analysis capability for non-proliferation and counter-terrorism.

McLendon, William Clarence, III; Wylie, Brian Neil

2009-10-01T23:59:59.000Z

457

Magnetic field generator  

DOE Patents (OSTI)

A magnetic field generating device provides a useful magnetic field within a specific retgion, while keeping nearby surrounding regions virtually field free. By placing an appropriate current density along a flux line of the source, the stray field effects of the generator may be contained. One current carrying structure may support a truncated cosine distribution, and it may be surrounded by a current structure which follows a flux line that would occur in a full coaxial double cosine distribution. Strong magnetic fields may be generated and contained using superconducting cables to approximate required current surfaces.

Krienin, Frank (Shoreham, NY)

1990-01-01T23:59:59.000Z

458

PULSE SYNTHESIZING GENERATOR  

DOE Patents (OSTI)

>An electronlc circuit for synthesizing electrical current pulses having very fast rise times includes several sinewave generators tuned to progressively higher harmonic frequencies with signal amplitudes and phases selectable according to the Fourier series of the waveform that is to be synthesized. Phase control is provided by periodically triggering the generators at precisely controlled times. The outputs of the generators are combined in a coaxial transmission line. Any frequency-dependent delays that occur in the transmission line can be readily compensated for so that the desired signal wave shape is obtained at the output of the line. (AEC)

Kerns, Q.A.

1963-08-01T23:59:59.000Z

459

Modern generator protection systems  

SciTech Connect

The special problems of the protection of generating stations with large machines connected to large integrated networks are presented. The coordination between the protective relays and tripping functions and the reliability of the protection scheme are important considerations in modern plants. Primary and backup protective functions, the applications, and their divisions into fault detection and ''fault prevention'' categories are considered. Testing and maintenance of the generator protection system including automatic calibration testing equipment is also discussed. The concept of the generator protection as a completely coordinated system and its realization with solid state protective relays is also presented. 9 refs.

Pencinger, C.J.

1981-01-01T23:59:59.000Z

460

Grid-connected and control of MPPT for wind power generation systems based on the SCIG  

Science Conference Proceedings (OSTI)

This paper adopts a main circuit structure with back-to-back PWM converter, in which generator-side using direct torque control method, and grid-side adopts three-phase VSR inner current decoupling control based feed forward control algorithms, and this ... Keywords: back-to-back, grid-connected, maximum power point tracking (MPPT), squirrel cage induction generator (SCIG), wind-turbine generation system

Yidong Chen; Yulin Yang; Liqiao Wang; Zhiyun Jia; Weiyang Wu

2010-03-01T23:59:59.000Z

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


461

ALTERNATE POWER AND ENERGY STORAGE/REUSE FOR DRILLING RIGS: REDUCED COST AND LOWER EMISSIONS PROVIDE LOWER FOOTPRINT FOR DRILLING OPERATIONS  

E-Print Network (OSTI)

Diesel engines operating the rig pose the problems of low efficiency and large amount of emissions. In addition the rig power requirements vary a lot with time and ongoing operation. Therefore it is in the best interest of operators to research on alternate drilling energy sources which can make entire drilling process economic and environmentally friendly. One of the major ways to reduce the footprint of drilling operations is to provide more efficient power sources for drilling operations. There are various sources of alternate energy storage/reuse. A quantitative comparison of physical size and economics shows that rigs powered by the electrical grid can provide lower cost operations, emit fewer emissions, are quieter, and have a smaller surface footprint than conventional diesel powered drilling. This thesis describes a study to evaluate the feasibility of adopting technology to reduce the size of the power generating equipment on drilling rigs and to provide ?peak shaving? energy through the new energy generating and energy storage devices such as flywheels. An energy audit was conducted on a new generation light weight Huisman LOC 250 rig drilling in South Texas to gather comprehensive time stamped drilling data. A study of emissions while drilling operation was also conducted during the audit. The data was analyzed using MATLAB and compared to a theoretical energy audit. The study showed that it is possible to remove peaks of rig power requirement by a flywheel kinetic energy recovery and storage (KERS) system and that linking to the electrical grid would supply sufficient power to operate the rig normally. Both the link to the grid and the KERS system would fit within a standard ISO container. A cost benefit analysis of the containerized system to transfer grid power to a rig, coupled with the KERS indicated that such a design had the potential to save more than $10,000 per week of drilling operations with significantly lower emissions, quieter operation, and smaller size well pad.

Verma, Ankit

2009-05-01T23:59:59.000Z

462

Application of Next-Generation Sensor Systems in HTRs  

E-Print Network (OSTI)

Accurate knowledge of the neutron flux distribution in a nuclear reactor has many tangible benefits. Perhaps the most important are the contributions to reactor safety. Detailed knowledge allows reactor operators to identify off-normal conditions quickly before they cause serious complications. Furthermore, reactor safety margins can be accurately quantified. As advanced reactor types are proposed, new sensor systems should be developed together with new algorithms for neutron flux reconstruction. This thesis develops neutron flux reconstruction methods for in-core sensors placed in HTRs. Sensor systems developed for current generation reactors cannot be used in HTRs. The high temperatures inside HTRs preclude the use of existing in-core sensors, and complex flux phenomena arising from the inner reflector and three-dimensional fuel block arrangements suggest that new flux reconstruction methods should be developed as well. Computer simulations were run to generate detailed in- core neutron flux distributions representative of HTRs. Next, this data was used to test two different flux reconstruction algorithms. It was found that the reconstruction algorithm based on the proper orthogonal decomposition performed better than the algorithm based on linear interpolation.

Johnson, Matthew Paul

2013-05-01T23:59:59.000Z

463

Lower power prices and high repair costs drive nuclear retirements ...  

U.S. Energy Information Administration (EIA)

However, concerns over the length of the review process and the high costs associated with steam generator repairs led SCE to retire both reactors.

464

generating | OpenEI  

Open Energy Info (EERE)

generating generating Dataset Summary Description This dataset comes from the Energy Information Administration (EIA), and is part of the 2011 Annual Energy Outlook Report (AEO2011). This dataset is table 9, and contains only the reference case. The dataset uses gigawatts. The data is broken down into power only, combined heat and power, cumulative planned additions, cumulative unplanned conditions, and cumulative retirements and total electric power sector capacity . Source EIA Date Released April 26th, 2011 (3 years ago) Date Updated Unknown Keywords 2011 AEO capacity consumption EIA Electricity generating Data application/vnd.ms-excel icon AEO2011: Electricity Generating Capacity- Reference Case (xls, 130.1 KiB) Quality Metrics Level of Review Peer Reviewed Comment

465

Generation -IV Reactor Concepts  

NLE Websites -- All DOE Office Websites (Extended Search)

Generation-IV Reactor Concepts Generation-IV Reactor Concepts Thomas H. Fanning Argonne National Laboratory 9700 South Cass Avenue Argonne, Illinois 60439, USA The Generation-IV International Forum (GIF) is a multi-national research and development (R&D) collaboration. The GIF pursues the development of advanced, next generation reactor technology with goals to improve: a) sustainability (effective fuel utilization and minimization of waste) b) economics (competitiveness with respect to other energy sources) c) safety and reliability (e.g., no need for offsite emergency response), and d) proliferation resistance and physical protection The GIF Technology Roadmap exercise selected six generic systems for further study: the Gas- cooled Fast Reactor (GFR), the Lead-cooled Fast Reactor (LFR), the Molten Salt Reactor (MSR),

466

Vector generator scan converter  

DOE Patents (OSTI)

High printing speeds for graphics data are achieved with a laser printer by transmitting compressed graphics data from a main processor over an I/O (input/output) channel to a vector generator scan converter which reconstructs a full graphics image for input to the laser printer through a raster data input port. The vector generator scan converter includes a microprocessor with associated microcode memory containing a microcode instruction set, a working memory for storing compressed data, vector generator hardward for drawing a full graphic image from vector parameters calculated by the microprocessor, image buffer memory for storing the reconstructed graphics image and an output scanner for reading the graphics image data and inputting the data to the printer. The vector generator scan converter eliminates the bottleneck created by the I/O channel for transmitting graphics data from the main processor to the laser printer, and increases printer speed up to thirty fold.

Moore, James M. (Livermore, CA); Leighton, James F. (Livermore, CA)

1990-01-01T23:59:59.000Z

467

Financing Distributed Generation  

DOE Green Energy (OSTI)

This paper introduces the engineer who is undertaking distributed generation projects to a wide range of financing options. Distributed generation systems (such as internal combustion engines, small gas turbines, fuel cells and photovoltaics) all require an initial investment, which is recovered over time through revenues or savings. An understanding of the cost of capital and financing structures helps the engineer develop realistic expectations and not be offended by the common requirements of financing organizations. This paper discusses several mechanisms for financing distributed generation projects: appropriations; debt (commercial bank loan); mortgage; home equity loan; limited partnership; vendor financing; general obligation bond; revenue bond; lease; Energy Savings Performance Contract; utility programs; chauffage (end-use purchase); and grants. The paper also discusses financial strategies for businesses focusing on distributed generation: venture capital; informal investors (''business angels''); bank and debt financing; and the stock market.

Walker, A.

2001-06-29T23:59:59.000Z

468

Next Generation Biomaterials  

Science Conference Proceedings (OSTI)

Apr 2, 2012 ... Characterization of Next-Generation Nickel-Titanium Rotary ... Manufacturing of Composite Fibrous Membranes for Biomedical and Energy Storage ... Prediction of the Stress Distribution and the Coating Delamination in ...

469

Relativistic electron beam generator  

DOE Patents (OSTI)

A relativistic electron beam generator for laser media excitation is described. The device employs a diode type relativistic electron beam source having a cathode shape which provides a rectangular output beam with uniform current density.

Mooney, L.J.; Hyatt, H.M.

1975-11-11T23:59:59.000Z

470

Micro Turbine Generator Program  

Science Conference Proceedings (OSTI)

A number of micro turbines generators have recently been announced as currently commercially available for sale to customers, such as end users, utilities, and energy service providers. Manufacturers and others are reporting certain performance capabilities ...

Stephanie L. Hamilton

2000-01-01T23:59:59.000Z

471

Geothermal Power Generation  

NLE Websites -- All DOE Office Websites (Extended Search)

1 GEOTHERMAL POWER GENERATION A PRIMER ON LOW-TEMPERATURE, SMALL-SCALE APPLICATIONS by Kevin Rafferty Geo-Heat Center January 2000 REALITY CHECK Owners of low-temperature...

472

Baroclinic Tsunami Generation  

Science Conference Proceedings (OSTI)

An analytical and experimental study of the baroclinic waves generated by a monopole dislocation of the sea floor is presented. Analytical results are based on a two-dimensional and linearized description of motion using a two-layer approximation ...

Joseph L. Hammack

1980-09-01T23:59:59.000Z

473

Local entropy generation analysis  

SciTech Connect

Second law analysis techniques have been widely used to evaluate the sources of irreversibility in components and systems of components but the evaluation of local sources of irreversibility in thermal processes has received little attention. While analytical procedures for evaluating local entropy generation have been developed, applications have been limited to fluid flows with analytical solutions for the velocity and temperature fields. The analysis of local entropy generation can be used to evaluate more complicated flows by including entropy generation calculations in a computational fluid dynamics (CFD) code. The research documented in this report consists of incorporating local entropy generation calculations in an existing CFD code and then using the code to evaluate the distribution of thermodynamic losses in two applications: an impinging jet and a magnetic heat pump. 22 refs., 13 figs., 9 tabs.

Drost, M.K.; White, M.D.

1991-02-01T23:59:59.000Z

474

Financing Distributed Generation  

SciTech Connect

This paper introduces the engineer who is undertaking distributed generation projects to a wide range of financing options. Distributed generation systems (such as internal combustion engines, small gas turbines, fuel cells and photovoltaics) all require an initial investment, which is recovered over time through revenues or savings. An understanding of the cost of capital and financing structures helps the engineer develop realistic expectations and not be offended by the common requirements of financing organizations. This paper discusses several mechanisms for financing distributed generation projects: appropriations; debt (commercial bank loan); mortgage; home equity loan; limited partnership; vendor financing; general obligation bond; revenue bond; lease; Energy Savings Performance Contract; utility programs; chauffage (end-use purchase); and grants. The paper also discusses financial strategies for businesses focusing on distributed generation: venture capital; informal investors (''business angels''); bank and debt financing; and the stock market.

Walker, A.

2001-06-29T23:59:59.000Z

475

Energy and Mass Generation  

E-Print Network (OSTI)

Modifications in the energy momentum dispersion laws due to a noncommutative geometry, have been considered in recent years. We examine the oscillations of extended objects in this perspective and find that there is now a "generation" of energy.

Burra G. Sidharth

2010-03-11T23:59:59.000Z

476

Biomass for Electricity Generation  

Reports and Publications (EIA)

This paper examines issues affecting the uses of biomass for electricity generation. The methodology used in the National Energy Modeling System to account for various types of biomass is discussed, and the underlying assumptions are explained.

Zia Haq

2002-07-01T23:59:59.000Z

477

Scram signal generator  

DOE Patents (OSTI)

A scram signal generating circuit for nuclear reactor installations monitors a flow signal representing the flow rate of the liquid sodium coolant which is circulated through the reactor, and initiates reactor shutdown for a rapid variation in the flow signal, indicative of fuel motion. The scram signal generating circuit includes a long-term drift compensation circuit which processes the flow signal and generates an output signal representing the flow rate of the coolant. The output signal remains substantially unchanged for small variations in the flow signal, attributable to long term drift in the flow rate, but a rapid change in the flow signal, indicative of a fast flow variation, causes a corresponding change in the output signal. A comparator circuit compares the output signal with a reference signal, representing a given percentage of the steady state flow rate of the coolant, and generates a scram signal to initiate reactor shutdown when the output signal equals the reference signal.

Johanson, Edward W. (New Lenox, IL); Simms, Richard (Westmont, IL)

1981-01-01T23:59:59.000Z

478

Vector generator scan converter  

DOE Patents (OSTI)

High printing speeds for graphics data are achieved with a laser printer by transmitting compressed graphics data from a main processor over an I/O channel to a vector generator scan converter which reconstructs a full graphics image for input to the laser printer through a raster data input port. The vector generator scan converter includes a microprocessor with associated microcode memory containing a microcode instruction set, a working memory for storing compressed data, vector generator hardware for drawing a full graphic image from vector parameters calculated by the microprocessor, image buffer memory for storing the reconstructed graphics image and an output scanner for reading the graphics image data and inputting the data to the printer. The vector generator scan converter eliminates the bottleneck created by the I/O channel for transmitting graphics data from the main processor to the laser printer, and increases printer speed up to thirty fold. 7 figs.

Moore, J.M.; Leighton, J.F.

1988-02-05T23:59:59.000Z

479

Taiwanese 3G mobile phone demand forecasting by SVR with hybrid evolutionary algorithms  

Science Conference Proceedings (OSTI)

Taiwan is one of the countries with higher mobile phone penetration rate in the world, along with the increasing maturity of 3G relevant products, the establishments of base stations, and updating regulations of 3G mobile phones, 3G mobile phones are ... Keywords: Autoregressive integrated moving average (ARIMA), Demand forecasting, General regression neural networks (GRNN), Genetic algorithm-simulated annealing (GA-SA), Support vector regression (SVR), Third generation (3G) mobile phone

Wei-Chiang Hong; Yucheng Dong; Li-Yueh Chen; Chien-Yuan Lai

2010-06-01T23:59:59.000Z

480

Steam Generator Management Program  

Science Conference Proceedings (OSTI)

The 24th EPRI Steam Generator NDE Workshop took place in San Diego, California, July 1113, 2005. It covered one full day and two half days of presentations. Attendees included representatives from domestic and overseas nuclear utilities, nuclear steam supply system (NSSS) vendors, nondestructive evaluation (NDE) service and equipment organizations, research laboratories, and regulatory bodies. This annual workshop serves as a forum for NDE specialists to gather and discuss current steam generator NDE iss...

2005-12-08T23:59:59.000Z

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481

Steam generator tube failures  

SciTech Connect

A review and summary of the available information on steam generator tubing failures and the impact of these failures on plant safety is presented. The following topics are covered: pressurized water reactor (PWR), Canadian deuterium uranium (CANDU) reactor, and Russian water moderated, water cooled energy reactor (VVER) steam generator degradation, PWR steam generator tube ruptures, the thermal-hydraulic response of a PWR plant with a faulted steam generator, the risk significance of steam generator tube rupture accidents, tubing inspection requirements and fitness-for-service criteria in various countries, and defect detection reliability and sizing accuracy. A significant number of steam generator tubes are defective and are removed from service or repaired each year. This wide spread damage has been caused by many diverse degradation mechanisms, some of which are difficult to detect and predict. In addition, spontaneous tube ruptures have occurred at the rate of about one every 2 years over the last 20 years, and incipient tube ruptures (tube failures usually identified with leak detection monitors just before rupture) have been occurring at the rate of about one per year. These ruptures have caused complex plant transients which have not always been easy for the reactor operators to control. Our analysis shows that if more than 15 tubes rupture during a main steam line break, the system response could lead to core melting. Although spontaneous and induced steam generator tube ruptures are small contributors to the total core damage frequency calculated in probabilistic risk assessments, they are risk significant because the radionuclides are likely to bypass the reactor containment building. The frequency of steam generator tube ruptures can be significantly reduced through appropriate and timely inspections and repairs or removal from service.

MacDonald, P.E.; Shah, V.N.; Ward, L.W.; Ellison, P.G.

1996-04-01T23:59:59.000Z

482

Electrical generating plant availability  

SciTech Connect

A discussion is given of actions that can improve availability, including the following: the meaning of power plant availability; The organization of the electric power industry; some general considerations of availability; the improvement of power plant availability--design factors, control of shipping and construction, maintenance, operating practices; sources of statistics on generating plant availability; effects of reducing forced outage rates; and comments by electric utilities on generating unit availability.

1975-05-01T23:59:59.000Z

483

A New Conceptual Graph Generated Algorithm for Semi-structured Databases  

Science Conference Proceedings (OSTI)

As the World Wide Web grows dramatically in recent years, there is increasing interest in semi-structured data on the web. Semi-structured data are usually represented in graph format, many graph schemas have then been proposed to extract schemas from ...

Kam-Fai Wong; Yat Fan Su; Dongqing Yang; Shiwei Tang

2001-10-01T23:59:59.000Z

484

An Assessment of the First- and Second-Generation Navy Operational Precipitation Retrieval Algorithms  

Science Conference Proceedings (OSTI)

Rainfall estimates produced from the Special Sensor Microwave/Imager (SSM/I) data have been utilized operationally by the United States Navy since the launch of the first SSM/I sensor in June of 1987. The navy initially contracted Hughes Aircraft ...

Wesley Berg; William Olson; Ralph Ferraro; Steven J. Goodman; Frank J. LaFontaine

1998-05-01T23:59:59.000Z

485

Implementation of Distributed Key Generation Algorithms using Secure Sockets A. T. Chronopoulos  

E-Print Network (OSTI)

¡ , F. Balbi, D. Veljkovic, N. Kolani Dept. of Computer Science, University of Texas at San Antonio

Chronopoulos, Anthony T.

486

Machine-Generated Algorithms, Proofs and Software for the Batch Verification of Digital Signature Schemes  

E-Print Network (OSTI)

expand upon an extended abstract on AutoBatch appearing in ACM CCS 2012 in a number of ways. We add a new Advanced Research Projects Agency (DARPA) and the Air Force Research Laboratory (AFRL) under contract FA (DARPA) and the Air Force Research Laboratory (AFRL) under contract FA8750-11-2-0211, the Office of Naval

487

A new Fourier method for evaluating generation system reliability indices  

SciTech Connect

A new, robust, and computationally efficient Fourier method for evaluating the loss of load probability and expected value of energy not served in a generation system is presented in this paper. An efficient algorithm is developed for computing the transformed probability density function of outages of all the generating units of the system. The fast Fourier transform algorithm is then used for transforming the load duration curve, and for inverse transformation of the product of the transformed outage function and the transformed load duration curve. As the method does not involve any approximation, it is expected to yield highly accurate results in all situations. Being a Fourier domain method, significant saving in computational effort results for systems with identical units. The application of the method is illustrated for a typical medium-sized system.

Mohan, P.; Balasubramanian, R.; Prakasa, K.S.

1986-08-01T23:59:59.000Z

488

Clinical evaluations of an amplitude-based binning algorithm for 4DCT reconstruction in radiation therapy  

SciTech Connect

Purpose: Phase-binning algorithms are commonly utilized in 4DCT image reconstruction for characterization of tumor or organ shape and respiration motion, but breathing irregularities occurring during 4DCT acquisition can cause considerable image distortions. Recently, amplitude-binning algorithms have been evaluated as a potential improvement to phase-binning algorithms for 4DCT image reconstruction. The purpose of this study was to evaluate the performance of the first commercially available on-line retrospective amplitude-binning algorithm for comparison to the traditional phase-binning algorithm. Methods: Both phantom and clinical data were used for evaluation. A phantom of known geometry was mounted on a 4D motion platform programmed with seven respiratory waves (two computer generated and five patient trajectories) and scanned with a Philips Brilliance Big bore 16-slice CT simulator. 4DCT images were reconstructed using commercial amplitude- and phase-binning algorithms. Image quality of the amplitude- and phase-binned image sets was compared by evaluation of shape and volume distortions in reconstructed images. Clinical evaluations were performed on 64 4DCT patient image sets in a blinded review process. The amplitude- and phase-binned 4DCT maximum intensity projection (MIP) images were further evaluated for 28 stereotactic body radiation therapy (SBRT) cases of total 64 cases. A preliminary investigation of the effects of respiratory amplitude and pattern irregularities on motion artifact severity was conducted. Results: The phantom experiments illustrated that, as expected, maximum inhalation occurred at the 0% amplitude and maximum exhalation occurred at the 50% amplitude of the amplitude-binned 4DCT image sets. The phantom shape distortions were more severe in the images reconstructed from the phase-binning algorithm. In the clinical study, compared to the phase-binning algorithm, the amplitude-binning algorithm yielded fewer or less severe motion artifacts in 37.5% of the cases (24/64), comparable artifacts in 54.7% of the cases (35/64), and slightly greater artifacts in 7.8% of the cases (5/64). Evaluation of SBRT cases demonstrated that the reconstructed tumor sizes and locations were comparable in 96% (1/28) of the MIP image pairs generated from both amplitude- and phase-binning algorithms. In this case the amplitude-binned image set rendered a smaller tumor size, which was likely due to very shallow respiratory amplitudes occurring over several breathing cycles. Conclusions: Overall, the amplitude-binning algorithm for 4DCT reconstruction reduced the severity of tumor distortion and image artifacts compared to the phase-binning algorithm. However, the full range of motion may not be characterized using amplitude-binning algorithms. Despite superior performance, amplitude binning can still be susceptible to motion artifacts caused by large variations in amplitude of respiratory waves.

Li Hua; Noel, Camille; Garcia-Ramirez, Jose; Low, Daniel; Bradley, Jeffrey; Robinson, Clifford; Mutic, Sasa; Parikh, Parag [Department of Radiation Oncology, Washington University School of Medicine, St. Louis, Missouri 63110 (United States); Department of Radiation Oncology, University of California Los Angeles, Los Angeles, California 90095 (United States); Department of Radiation Oncology, Washington University School of Medicine, St. Louis, Missouri 63110 (United States)

2012-02-15T23:59:59.000Z

489

Gas generation from the irradiation of mortar  

DOE Green Energy (OSTI)

A mortar formulation capable of immobilizing chloride salts with high levels of radioactivity is being developed. As part of the developmental effort, radiation effects are being investigated. The radiolytic generation of gas(es) from irradiated mortar formulations was determined for several formulations with variable salt loadings at several test temperatures. The irradiation of a mortar formulation consisting of cement, slag, fly ash, water and 0 to 10 wt % salt led to the generation of hydrogen. The rate of generation was approximately constant, steady state pressures were not attained and final pressures were comparatively high. Higher salt concentrations were correlated with higher hydrogen generation rates for experiments at ambient temperature while lower rates were observed at 120/degree/C. The irradiation of a mortar consisting of cement, fly ash, water and salt led to the radiolytic generation of both oxygen and hydrogen. The addition of 2 wt % FeS or CaS inhibited oxygen generation and changed the hydrogen production rate. 10 refs., 4 figs., 3 tabs.

Lewis, M.A.; Warren, D.W.

1989-01-01T23:59:59.000Z

490

Waste Heat Recovery Power Generation with WOWGen  

E-Print Network (OSTI)

WOW operates in the energy efficiency field- one of the fastest growing energy sectors in the world today. The two key products - WOWGen® and WOWClean® provide more energy at cheaper cost and lower emissions. •WOWGen® - Power Generation from Industrial Waste Heat •WOWClean® - Multi Pollutant emission control system. Current power generation technology uses only 35% of the energy in a fossil fuel and converts it to useful output. The remaining 65% is discharged into the environment as waste heat at temperatures ranging from 300°F to 1,200°F. This waste heat can be captured using the WOWGen® technology and turned into electricity. This efficiency is up to twice the rate of competing technologies. Compelling economics and current environmental policy are stimulating industry interest. WOWGen® power plants can generate between 1 - 25 MW of electricity. Project payback is between two to five years with IRR of 15% 30%. Nearly anywhere industrial waste heat is present, the WOW products can be applied. Beneficial applications of heat recovery power generation can be found in Industry (e.g. steel, glass, cement, lime, pulp and paper, refining and petrochemicals), Power Generation (CHP, biomass, biofuel, traditional fuels, gasifiers, diesel engines) and Natural Gas (pipeline compression stations, processing plants). Sources such as stack flue gases, steam, diesel exhaust, hot oil or combinations of sources can be used to generate power. WOWGen® can also be used with stand alone power plants burning fossil fuels or using renewable energy sources such as solar and biomass.

Romero, M.

2009-05-01T23:59:59.000Z

491

VC-dimension and shortest path algorithms  

Science Conference Proceedings (OSTI)

We explore the relationship between VC-dimension and graph algorithm design. In particular, we show that set systems induced by sets of vertices on shortest paths have VC-dimension at most two. This allows us to use a result from learning theory to improve ...

Ittai Abraham; Daniel Delling; Amos Fiat; Andrew V. Goldberg; Renato F. Werneck

2011-07-01T23:59:59.000Z

492

Algorithms for dynamic multicast key distribution  

Science Conference Proceedings (OSTI)

We study the problem of multicast key distribution for group security. Secure group communication systems typically rely on a group key, which is a secret shared among the members of the group. This key is used to provide privacy by encrypting all group ... Keywords: Dynamic key distribution, experimental algorithms, multicast

Justin Goshi; Richard E. Ladner

2007-02-01T23:59:59.000Z

493

Comparative Benchmarks of full QCD Algorithms  

E-Print Network (OSTI)

We report performance benchmarks for several algorithms that we have used to simulate the Schr"odinger functional with two flavors of dynamical quarks. They include hybrid and polynomial hybrid Monte Carlo with preconditioning. An appendix describes a method to deal with autocorrelations for nonlinear functions of primary observables as they are met here due to reweighting.

Roberto Frezzotti; Martin Hasenbusch; Jochen Heitger; Karl Jansen; Ulli Wolff

2000-09-20T23:59:59.000Z

494

Asynchronous Event-Driven Particle Algorithms  

Science Conference Proceedings (OSTI)

We present, in a unifying way, the main components of three asynchronous event-driven algorithms for simulating physical systems of interacting particles. The first example, hard-particle molecular dynamics, is well known. We also present a recently ... Keywords: Asynchronous, event-driven, kinetic Monte Carlo, molecular dynamics, particle systems

Aleksandar Donev

2009-04-01T23:59:59.000Z

495

“Energy-conserving” plasma simulation algorithms  

Science Conference Proceedings (OSTI)

Lewis has found algorithms for many-particle plasma simulation models in which there exists an exact energy constant in the limit of small time step. The requirements for energy consevation are examined here and relaxed from those given by Lewis, in ...

A. Bruce Langdon

1973-02-01T23:59:59.000Z

496

A scalable lock-free stack algorithm  

E-Print Network (OSTI)

The literature describes two high performance concurrent stack algorithms based on combining funnels and elimination trees. Unfortunately, the funnels are linearizable but blocking, and the elimination trees are non-blocking but not linearizable. Neither is used in practice since they perform well only at exceptionally high loads. The literature also describes a simple lock-free linearizable stack algorithm that works at low loads but does not scale as the load increases. The question of designing a stack algorithm that is non-blocking, linearizable, and scales well throughout the concurrency range, has thus remained open. This paper presents such a concurrent stack algorithm. It is based on the following simple observation: that a single elimination array used as a backoff scheme for a simple lock-free stack is lock-free, linearizable, and scalable. As our empirical results show, the resulting eliminationbackoff stack performs as well as the simple stack at low loads, and increasingly outperforms all other methods (lock-based and non-blocking) as concurrency increases. We believe its simplicity and scalability make it a viable practical alternative to existing constructions for implementing concurrent stacks.

Danny Hendler; Nir Shavit; Lena Yerushalmi

2004-01-01T23:59:59.000Z

497

New algorithms research for first year students  

Science Conference Proceedings (OSTI)

Motivated first-year undergraduate students should be exposed to some of the processes of research and some of the latest results. This brings them into the university culture quickly and encourages them to feel part of the development of the computer ... Keywords: CS1/2, approximation algorithms, haskell, research-led teaching, undergraduate research/capstones

Anthony Wirth; Michael Bertolacci

2006-06-01T23:59:59.000Z

498

A spreadsheet algorithm for stagewise solvent extraction  

SciTech Connect

Part of the novelty is the way in which the problem is organized in the spreadsheet. In addition, to facilitate spreadsheet setup, a new calculational procedure has been developed. The resulting Spreadsheet Algorithm for Stagewise Solvent Extraction (SASSE) can be used with either IBM or Macintosh personal computers as a simple yet powerful tool for analyzing solvent extraction flowsheets.

Leonard, R.A.; Regalbuto, M.C.

1993-01-01T23:59:59.000Z

499

Groundwater Remediation Strategy Using Global Optimization Algorithms  

E-Print Network (OSTI)

. DOI: 10.1061/ ASCE 0733-9496 2002 128:6 431 CE Database keywords: Ground water; Remedial action; Algorithms; Ground-water management. Introduction The contamination of groundwater is a widespread problem al. 1992 , Jonoski et al. 1997 ; and Willis and Yeh 1987 . However, the fact that the optimization

Neumaier, Arnold

500

Versatile communication algorithms for data analysis  

Science Conference Proceedings (OSTI)

Large-scale parallel data analysis, where global information from a variety of problem domains is resolved in a distributed memory space, relies on communication. Three communication algorithms motivated by data analysis workloads--merge based reduction, ... Keywords: communication for large-scale parallel data analysis

Tom Peterka; Robert Ross

2012-09-01T23:59:59.000Z