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Note: This page contains sample records for the topic "trough linear fresnel" from the National Library of EnergyBeta (NLEBeta).
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We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

SunShot Initiative: Linear Fresnel  

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

Linear Fresnel to someone by Linear Fresnel to someone by E-mail Share SunShot Initiative: Linear Fresnel on Facebook Tweet about SunShot Initiative: Linear Fresnel on Twitter Bookmark SunShot Initiative: Linear Fresnel on Google Bookmark SunShot Initiative: Linear Fresnel on Delicious Rank SunShot Initiative: Linear Fresnel on Digg Find More places to share SunShot Initiative: Linear Fresnel on AddThis.com... Concentrating Solar Power Systems Parabolic Trough Linear Fresnel Power Tower Dish Engine Components Competitive Awards Staff Photovoltaics Systems Integration Balance of Systems Linear Fresnel DOE funds solar research and development (R&D) in linear Fresnel systems as one of four CSP technologies aiming to meet the goals of the SunShot Initiative. Linear Fresnel systems, which are a type of linear

2

Linear Fresnel | Department of Energy  

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

Linear Fresnel systems, which are a type of linear concentrator, are active in Germany, Spain, Australia, India, and the United States. The SunShot Initiative funds R&D on...

3

Optical performance of an azimuth tracking linear Fresnel solar concentrator  

Science Journals Connector (OSTI)

Abstracts In this paper, a linear Fresnel solar concentrator installed on a solar azimuth tracker is studied. Based on the integration of the effective source distribution for a reflection point and the whole reflector area, we develop an analytical model to calculate the intercept factor of the concentrator and analyze its performance over a year. The prediction of our analytical optical model agrees pretty well with that of the ray tracing program SolTRACE. Then we study the effects of the main design parameters on the performance of the system. The results show that annual mean total efficiency of 61% can be obtained in optimized design when the operational temperature of the receiver is 400 °C. The performance of the azimuth tracking linear Fresnel solar concentrator (ATLFSC) is compared with that of the parabolic trough collector. It is found that the cosine factor, intercept factor and total efficiency of the ATLFSC are better than those of parabolic trough collector, showing that the ATLFSC may have great potential for solar energy utilization.

Farong Huang; Longlong Li; Weidong Huang

2014-01-01T23:59:59.000Z

4

NREL: TroughNet - Parabolic Trough Workshops  

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

Parabolic Trough Workshops Parabolic Trough Workshops Here you'll find information about workshops and forums concerning parabolic trough technology and concentrating solar power. Also, see upcoming events on concentrating solar power. Past Workshops and Forums 2007 Parabolic Trough Technology Workshop March 8-9, 2007 Golden, CO 2007 Solar Power Tower, Dish Stirling and Linear Fresnel Technologies Workshop March 7, 2007 Golden, CO 2006 Parabolic Trough Technology Workshop February 14-16, 2006 Incline Village, NV 2004 Solar Thermal Electric International Project Development Forum July 13, 2004 Portland, OR 2003 Parabolic Trough Thermal Energy Storage Workshop February 20-21, 2003 Golden, CO 2001 Solar Energy Forum: The Power to Choose April 21-25, 2001 Washington, D.C. 2000 Parabolic Trough Technology Workshop

5

Results and Comparison from the SAM Linear Fresnel Technology Performance Model: Preprint  

SciTech Connect

This paper presents the new Linear Fresnel technology performance model in NREL's System Advisor Model. The model predicts the financial and technical performance of direct-steam-generation Linear Fresnel power plants, and can be used to analyze a range of system configurations. This paper presents a brief discussion of the model formulation and motivation, and provides extensive discussion of the model performance and financial results. The Linear Fresnel technology is also compared to other concentrating solar power technologies in both qualitative and quantitative measures. The Linear Fresnel model - developed in conjunction with the Electric Power Research Institute - provides users with the ability to model a variety of solar field layouts, fossil backup configurations, thermal receiver designs, and steam generation conditions. This flexibility aims to encompass current market solutions for the DSG Linear Fresnel technology, which is seeing increasing exposure in fossil plant augmentation and stand-alone power generation applications.

Wagner, M. J.

2012-04-01T23:59:59.000Z

6

Linear Fresnel Collector Receiver: Heat Loss and Temperatures  

Science Journals Connector (OSTI)

Abstract For design and component specification of a Linear Fresnel Collector (LFC) cavity receiver, the prediction of temperature distribution and heat loss is of great importance. In this paper we present a sensitivity analysis for a range of geometry and material parameters. For the LFC receiver analysis we use two models developed at Fraunhofer ISE. One is a detailed model, combining the spatial distribution of reflected radiation via ray tracing with detailed convective simulations through computational fluid dynamics. The second one is a fast algorithm based on a thermal resistance model. It is applying a similar methodology as the well-known model for vacuum absorber, enhancing an absorber tube model by parameters describing the influence of the secondary mirror and cover glass. The thermal resistance model is described in detail. Obtained results indicate a significant effect of the secondary mirror temperature on heat loss for specific geometries.

A. Heimsath; F. Cuevas; A. Hofer; P. Nitz; W.J. Platzer

2014-01-01T23:59:59.000Z

7

History, current state, and future of linear Fresnel concentrating solar collectors  

Science Journals Connector (OSTI)

Abstract Linear Fresnel collectors are a type of concentrating solar power technology. In this paper, the technology’s technical features and aspects are first described via illustrations of various design concepts; then, the past low- and intermediate-temperature applications of linear Fresnel collectors are reviewed and their state-of-the-art applications in utility-scale electricity generation are presented; finally, the performance, technical challenges, and future outlook of linear Fresnel technology in the context of utility-scale power plants are summarized.

Guangdong Zhu; Tim Wendelin; Michael J. Wagner; Chuck Kutscher

2014-01-01T23:59:59.000Z

8

A comparative analysis of configurations of linear Fresnel collectors for concentrating solar power  

Science Journals Connector (OSTI)

Abstract Linear Fresnel collector arrays present some relevant advantages in the domain of concentrating solar power because of their simplicity, robustness and low capital cost. However, they also present important drawbacks and limitations, notably their average concentration ratio, which seems to limit significantly the performance of these systems. First, the paper addresses the problem of characterizing the mirror field configuration assuming hourly data of a typical year, in reference to a configuration similar to that of Fresdemo. For a proper comparative study, it is necessary to define a comparison criterion. In that sense, a new variable is defined, the useful energy efficiency, which only accounts for the radiation that impinges on the receiver with intensities above a reference value. As a second step, a comparative study between central linear Fresnel reflectors and compact linear Fresnel reflectors is carried out. This analysis shows that compact linear Fresnel reflectors minimize blocking and shading losses compared to a central configuration. However this minimization is not enough to overcome other negative effects of the compact Fresnel collectors, as the greater dispersion of the rays reaching the receiver, caused by the fact that mirrors must be located farther from the receiver, which yields to lower efficiencies.

María J. Montes; Carlo Rubbia; Rubén Abbas; José M. Martínez-Val

2014-01-01T23:59:59.000Z

9

Project Profile: Commercial Development of an Advanced Linear-Fresnel-Based CSP Concept  

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

SkyFuel, under the CSP R&D FOA, is developing a commercial linear-Fresnel-based advanced CSP system called Linear Power Tower (LPT). The company aims to make significant improvements in the cost and viability of utility-scale dispatchable solar power.

10

Multi-tower line focus Fresnel array project  

SciTech Connect

As an alternative to conventional tracking solar thermal trough systems, one may use line focus Fresnel reflector systems. In a conventional Fresnel reflector design, each field of reflectors is directed to a single tower. However efficient systems of very high ground utilisation can be setup if a field of reflectors uses multiple receivers on different towers. This paper describes a line focus system, called the compact linear fresnel reflector system and a project to produce an initial 95 MWth solar array. The array will be used as a retrofit preheater for a coal fired generating plant.

Mills, D.R.; Morrison, G.; Pye, J.; Le Lievre, P. [Solar Heat & Power SHP Pty. Ltd., Sydney, NSW (Australia)

2006-02-15T23:59:59.000Z

11

A Linear Parabolic Trough Solar Collector Performance Model  

E-Print Network (OSTI)

: 1 bar (winter) Pressure in solar collection loop: 10 bar (Summer), 5 bar (winter) Pressure in main chilled water loop : 1 bar (summer) TIC TIC TIC TIC Space Thermostat May 18,06 Parabolic Solar Trough Collector: 52.44 m^2 / 4 modules... & winter) Chilled/Heat Water Storage Current Existing Future Installation Current Installation TIC TIC EIC Temperature indicator controller Energy indicator controller Fig. 1 IW solar heating and cooling system 1.3 EES Model In order to understand...

Qu, M.; Archer, D.; Masson, S.

2006-01-01T23:59:59.000Z

12

Evaluation of a heliostat tracker for linear Fresnel lens photovoltaic concentrators  

SciTech Connect

This report presents the results of an evaluation of a heliostat tracking structure used as a two-axis tracking platform for ENTECH's linear focus Fresnel lens photovoltaic collectors. The study included the installation and operation of a heliostat tracker populated with 30 modules (1 operational and 29 non-operational) on a 32-ft x 32-ft platform. Details of the array installation, collector mounting, and array tracking accuracy are provided. Test results demonstrate that the heliostat tracker meets the performance requirements imposed by the collector. The evaluation includes a comparison of the heliostat tracker approach with the current tracker approach (a roll/tilt array). Results of the comparison do not identify a clearly superior option.

Not Available

1986-12-01T23:59:59.000Z

13

Direct-Steam Linear Fresnel Performance Model for NREL's System Advisor Model  

SciTech Connect

This paper presents the technical formulation and demonstrated model performance results of a new direct-steam-generation (DSG) model in NREL's System Advisor Model (SAM). The model predicts the annual electricity production of a wide range of system configurations within the DSG Linear Fresnel technology by modeling hourly performance of the plant in detail. The quasi-steady-state formulation allows users to investigate energy and mass flows, operating temperatures, and pressure drops for geometries and solar field configurations of interest. The model includes tools for heat loss calculation using either empirical polynomial heat loss curves as a function of steam temperature, ambient temperature, and wind velocity, or a detailed evacuated tube receiver heat loss model. Thermal losses are evaluated using a computationally efficient nodal approach, where the solar field and headers are discretized into multiple nodes where heat losses, thermal inertia, steam conditions (including pressure, temperature, enthalpy, etc.) are individually evaluated during each time step of the simulation. This paper discusses the mathematical formulation for the solar field model and describes how the solar field is integrated with the other subsystem models, including the power cycle and optional auxiliary fossil system. Model results are also presented to demonstrate plant behavior in the various operating modes.

Wagner, M. J.; Zhu, G.

2012-09-01T23:59:59.000Z

14

Performance of a concentrated photovoltaic energy system with static linear Fresnel lenses  

Science Journals Connector (OSTI)

A new type of greenhouse with linear Fresnel lenses in the cover performing as a concentrated photovoltaic (CPV) system is presented. The CPV system retains all direct solar radiation, while diffuse solar radiation passes through and enters into the greenhouse cultivation system. The removal of all direct radiation will block up to 77% of the solar energy from entering the greenhouse in summer, reducing the required cooling capacity by about a factor 4. This drastically reduce the need for cooling in the summer and reduce the use of screens or lime coating to reflect or block radiation. All of the direct radiation is concentrated by a factor of 25 on a photovoltaic/thermal (PV/T) module and converted to electrical and thermal (hot water) energy. The PV/T module is kept in position by a tracking system based on two electric motors and steel cables. The energy consumption of the tracking system, ca. 0.51 W m?2, is less than 2% of the generated electric power yield. A peak power of 38 W m?2 electrical output was measured at 792 W m?2 incoming radiation and a peak power of 170 W m?2 thermal output was measured at 630 W m?2 incoming radiation of. Incoming direct radiation resulted in a thermal yield of 56% and an electric yield of 11%: a combined efficiency of 67%. The annual electrical energy production of the prototype system is estimated to be 29 kW h m?2 and the thermal yield at 518 MJ m?2. The collected thermal energy can be stored and used for winter heating. The generated electrical energy can be supplied to the grid, extra cooling with a pad and fan system and/or a desalination system. The obtained results show a promising system for the lighting and temperature control of a greenhouse system and building roofs, providing simultaneous electricity and heat. It is shown that the energy contribution is sufficient for the heating demand of well-isolated greenhouses located in north European countries.

P.J. Sonneveld; G.L.A.M. Swinkels; B.A.J. van Tuijl; H.J.J. Janssen; J. Campen; G.P.A. Bot

2011-01-01T23:59:59.000Z

15

Evolution and preservation of closed linear troughs in the Hueco bolson of west Texas  

E-Print Network (OSTI)

, have been and are now taking place along the length of the troughs. Those adjustments act to offset the effects of aeolian processes, preserving the troughs over time as areas of depression. Several minable sand and gavel deposits have been located...

Burrell, Jonathan K

2012-06-07T23:59:59.000Z

16

New Optical Evaluation Approach for Parabolic Trough Collectors: First-Principle OPTical Intercept Calculation  

SciTech Connect

A new analytical method -- First-principle OPTical Intercept Calculation (FirstOPTIC) -- is presented here for optical evaluation of trough collectors. It employs first-principle optical treatment of collector optical error sources and derives analytical mathematical formulae to calculate the intercept factor of a trough collector. A suite of MATLAB code is developed for FirstOPTIC and validated against theoretical/numerical solutions and ray-tracing results. It is shown that FirstOPTIC can provide fast and accurate calculation of intercept factors of trough collectors. The method makes it possible to carry out fast evaluation of trough collectors for design purposes. The FirstOPTIC techniques and analysis may be naturally extended to other types of CSP technologies such as linear-Fresnel collectors and central-receiver towers.

Zhu, G.; Lewandowski, A.

2012-11-01T23:59:59.000Z

17

Influence of circumferential solar heat flux distribution on the heat transfer coefficients of linear Fresnel collector absorber tubes  

Science Journals Connector (OSTI)

Abstract The absorber tubes of solar thermal collectors have enormous influence on the performance of the solar collector systems. In this numerical study, the influence of circumferential uniform and non-uniform solar heat flux distributions on the internal and overall heat transfer coefficients of the absorber tubes of a linear Fresnel solar collector was investigated. A 3D steady-state numerical simulation was implemented based on ANSYS Fluent code version 14. The non-uniform solar heat flux distribution was modelled as a sinusoidal function of the concentrated solar heat flux incident on the circumference of the absorber tube. The k–? model was employed to simulate the turbulent flow of the heat transfer fluid through the absorber tube. The tube-wall heat conduction and the convective and irradiative heat losses to the surroundings were also considered in the model. The average internal and overall heat transfer coefficients were determined for the sinusoidal circumferential non-uniform heat flux distribution span of 160°, 180°, 200° and 240°, and the 360° span of circumferential uniform heat flux for 10 m long absorber tubes of different inner diameters and wall thicknesses with thermal conductivity of 16.27 W/mK between the Reynolds number range of 4000 and 210,000 based on the inlet temperature. The results showed that the average internal heat transfer coefficients for the 360° span of circumferential uniform heat flux with different concentration ratios on absorber tubes of the same inner diameters, wall thicknesses and thermal conductivity were approximately the same, but the average overall heat transfer coefficient increased with the increase in the concentration ratios of the uniform heat flux incident on the tubes. Also, the average internal heat transfer coefficient for the absorber tube with a 360° span of uniform heat flux was approximately the same as that of the absorber tubes with the sinusoidal circumferential non-uniform heat flux span of 160°, 180°, 200° and 240° for the heat flux of the same concentration ratio, but the average overall heat transfer coefficient for the uniform heat flux case was higher than that of the non-uniform flux distributions. The average axial local internal heat transfer coefficient for the 360° span of uniform heat flux distribution on a 10 m long absorber tube was slightly higher than that of the 160°, 200° and 240° span of non-uniform flux distributions at the Reynolds number of 4 000. The average internal and overall heat transfer coefficients for four absorber tubes of different inner diameters and wall thicknesses and thermal conductivity of 16.27 W/mK with 200° span of circumferential non-uniform flux were found to increase with the decrease in the inner-wall diameter of the absorber tubes. The numerical results showed good agreement with the Nusselt number experimental correlations for fully developed turbulent flow available in the literature.

Izuchukwu F. Okafor; Jaco Dirker; Josua P. Meyer

2014-01-01T23:59:59.000Z

18

Experimental and numerical heat transfer analysis of a V-cavity absorber for linear parabolic trough solar collector  

Science Journals Connector (OSTI)

Abstract In the present study, a V-cavity absorber with rectangular fins that can be used in the linear parabolic trough collector (PTC) system was proposed and investigated both theoretically and experimentally. The optical performance of the absorber was studied by means of Monte-Carlo ray-tracing (MCRT) method. An energy balance model and a more detailed three-dimensional numerical model were developed to analyze the flow and heat transfer characteristics. Moreover, an experimental setup was built to validate the theoretical analysis. A reasonable agreement between the theoretical and experimental results was achieved, which proves the feasibility and reliability of the models. The results show that the sunlight could be reflected repeatedly by the triangle shape and nearly no sunlight escapes. The absorber with rectangular fins has a better heat transfer performance with higher outlet temperature of heat transfer fluid (HTF), lower temperature of heating surface and lower heat loss than those of absorber without fins. The effects of heat flux distribution, mass flow rate and direct normal irradiance on the heat transfer performance were further discussed. In addition, the variations of the heat transfer coefficient along z axial direction with different mass flow rates were also calculated based on the numerical results.

X. Xiao; P. Zhang; D.D. Shao; M. Li

2014-01-01T23:59:59.000Z

19

Thermodynamic and optical analysis for a CPV/T hybrid system with beam splitter and fully tracked linear Fresnel reflector concentrator utilizing sloped panels  

Science Journals Connector (OSTI)

Abstract Spectral splitting technology that separates solar spectrum into several parts and enables different energy conversions such as photovoltaic (PV) conversion and photo-thermal conversion aims to utilize the full spectrum solar energy efficiently. A novel concentrating PV/Thermal (CPV/T) hybrid system with beam splitter and fully tracked linear Fresnel reflector concentrator utilizing sloped panels was proposed in this study. The relations between the structural parameters and the optical performances of the system were investigated. The concentrated radiation distribution on the PV device surface was simulated by taking into account the main optical errors and shows a good uniformity. Based on the experimental data of the components, thermodynamic analysis on the CPV/T hybrid system was carried out and the results reveal that the overall energy conversion efficiencies of the proposed CPV/T hybrid system is higher than that of the CPV system under the same conditions.

Yang Liu; Peng Hu; Qian Zhang; Zeshao Chen

2014-01-01T23:59:59.000Z

20

Nonimaging Fresnel Lens Design  

Science Journals Connector (OSTI)

A Fresnel lens is essentially a chain of prisms. Each prism represents the slope of the lens surface, but without the material of the full body of the conventional singlet. The imaging Fresnel lens refracts li...

Dr. Ralf Leutz; Dr. Akio Suzuki

2001-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trough linear fresnel" 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

Other Fresnel Zone Antennas  

Science Journals Connector (OSTI)

In the preceding chapters, theoretical investigations and experiments on a number of Fresnel zone antennas are presented. This chapter is intended to introduce a wider range of Fresnel zone antennas. Section 7...

Y. Jay Guo; Stephen K. Barton

2002-01-01T23:59:59.000Z

22

Trough to trough The Colorado River  

E-Print Network (OSTI)

Trough to trough The Colorado River and the Salton Sea Robert E. Reynolds, editor Trough to trough....................................................................................5 Robert E. Reynolds The vegetation of the Mojave and Colorado deserts geological excursions and observations of the Colorado Desert region by William Phipps Blake, 1853 and 1906

de Lijser, Peter

23

Offset Fresnel Zoneplate  

Science Journals Connector (OSTI)

The most common form of Fresnel zone reflectors and lenses is the circular zoneplate. The design of the simple circular zoneplate is well documented in the open literature, and experiments at various frequenci...

Y. Jay Guo; Stephen K. Barton

2002-01-01T23:59:59.000Z

24

NREL: TroughNet - Parabolic Trough FAQs  

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

Parabolic Trough FAQs Parabolic Trough FAQs Find answers to frequently asked questions about parabolic trough solar technology. Question topics include: Central station solar benefits Economic and environmental benefits Electricity cost Installation and operation Land use Large-scale vs. distributed power Past construction decline Photovoltaics comparison Power plant cost Power plant siting Technology potential Water use Some of the following documents are available as Adobe Acrobat PDFs. How much does a parabolic trough power plant cost? The cost of a parabolic trough power plant depends on many factors such as plant size, whether thermal energy storage is included, and whether the solar field has been enlarged to increase the annual plant capacity factor. Based on these considerations the current capital cost for large

25

Definition: Parabolic trough | Open Energy Information  

Open Energy Info (EERE)

Definition Definition Edit with form History Facebook icon Twitter icon » Definition: Parabolic trough Jump to: navigation, search Dictionary.png Parabolic trough A solar energy conversion device that uses a trough covered with a highly reflective surface to focus sunlight onto a linear absorber containing a working fluid that can be used to spin a turbine for electricity generation; with a single-axis sun-tracking system, the configuration of a parabolic trough can track the sun from east to west during the day.[1][2][3] View on Wikipedia Wikipedia Definition A parabolic trough is a type of solar thermal collector that is straight in one dimension and curved as a parabola in the other two, lined with a polished metal mirror. The energy of sunlight which enters the

26

Fresnel and refractive lenses for X-rays  

Science Journals Connector (OSTI)

We present a Gaussian beam analysis of X-ray refractive and Fresnel lenses. The X-ray refractive lens is featured by an intrinsic soft (Gaussian) aperture due to strong absorption of X-rays by materials. We defined a parameter N0, the critical Fresnel number (CFN), to describe this optical property. The values of N0 for all practical materials are below 1000 for photon energies exceeding 30 eV, still lower for high-Z materials. The maximum effective Fresnel number of a lens is determined by its material to be 2N0 and its maximum enhancement of X-ray intensity is limited to (2?N0)2, independent of its shape. We found that the refractive lens is likely to be useful for manipulating nearly diffraction limited beam in the hard X-ray region and its application is severely restricted by available fabrication capabilities today. X-ray Fresnel lenses, both in cylindrical and linear forms, are proposed as superior focusing elements for hard X-rays. Their high efficiency, up to 100% in optimal construction, will enable us to manipulate beams with multiple lenses and obtain higher performance optics. Their design and fabrication are discussed in reference to those of X-ray Fresnel zone plates and micro Fresnel lenses for optoelectronics.

B.X. Yang

1993-01-01T23:59:59.000Z

27

Rinse trough with improved flow  

DOE Patents (OSTI)

Novel rinse troughs accomplish thorough uniform rinsing. The troughs are suitable for one or more essentially planar objects having substantially the same shape. The troughs ensure that each surface is rinsed uniformly. The new troughs provide uniform rinse fluid flow over the objects` surfaces to accomplish a more thorough rinse than prior art troughs. 5 figs.

O`Hern, T.J.; Grasser, T.W.

1998-08-11T23:59:59.000Z

28

Parabolic Trough Solar Technology  

Science Journals Connector (OSTI)

Parabolic trough (solar) collectors (PTCs) are technical devices to collect the energy in form of solar radiation and convert it typically into thermal energy at temperature ranges of 150–500°C at industrial s...

Dr.-Ing. Eckhard Lüpfert

2013-01-01T23:59:59.000Z

29

Parabolic Trough Solar Technology  

Science Journals Connector (OSTI)

Parabolic trough (solar) collectors (PTCs) are technical devices to collect the energy in form of solar radiation and convert it typically into thermal energy at temperature ranges of 150–500°C at industrial s...

Dr.-Ing. Eckhard Lüpfert

2012-01-01T23:59:59.000Z

30

Directed flow fluid rinse trough  

DOE Patents (OSTI)

Novel rinse troughs accomplish thorough uniform rinsing. The tanks are suitable for one or more essentially planar items having substantially the same shape. The troughs ensure that each surface is rinsed uniformly. The new troughs also require less rinse fluid to accomplish a thorough rinse than prior art troughs.

Kempka, Steven N. (9504 Lona La., Albuquerque, NM 87111); Walters, Robert N. (11872 LaGrange St., Boise, ID 83709)

1996-01-01T23:59:59.000Z

31

Directed flow fluid rinse trough  

DOE Patents (OSTI)

Novel rinse troughs accomplish thorough uniform rinsing. The tanks are suitable for one or more essentially planar items having substantially the same shape. The troughs ensure that each surface is rinsed uniformly. The new troughs also require less rinse fluid to accomplish a thorough rinse than prior art troughs. 9 figs.

Kempka, S.N.; Walters, R.N.

1996-07-02T23:59:59.000Z

32

Advanced photovoltaic-trough development  

SciTech Connect

The scope of the work on photvoltaic troughs includes analytical studies, hardware development, and component testing. Various aspects of the system have been optimized and improvements have been realized, particularly in the receiver and reflecting surface designs. An empirical system performance model has been developed that closely agrees with measured system performance. This in-depth study of single-axis reflecting linear focus photovoltaic concentrators will be very beneficial in the development of improved models for similar systems as well as other phtovoltaic concentrator designs.

Spencer, R.; Yasuda, K.; Merson, B.

1982-04-01T23:59:59.000Z

33

Project Profile: Commercial Development of an Advanced Linear...  

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

Commercial Development of an Advanced Linear-Fresnel-Based CSP Concept Project Profile: Commercial Development of an Advanced Linear-Fresnel-Based CSP Concept SkyFuel logo SkyFuel,...

34

NREL: TroughNet - Parabolic Trough Technology Research and Development  

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

and its R&D history. R&D History Since Luz built the first commercial parabolic trough power plant in 1984 (SEGS I), parabolic trough technology has been constantly evolving and...

35

NREL: TroughNet - Parabolic Trough Power Plant System Technology  

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

Parabolic Trough Power Plant System Technology Parabolic Trough Power Plant System Technology A parabolic trough solar power plant uses a large field of collectors to supply thermal energy to a conventional power plant. Because they use conventional power cycles, parabolic trough power plants can be hybridized-other fuels can be used to back up the solar power. Like all power cycles, trough power plants also need a cooling system to transfer waste heat to the environment. Parabolic trough power plant technologies include: Direct steam generation Fossil-fired (hybrid) backup Operation and maintenance Power cycles Steam Rankine Organic Rankine Combined Wet and dry cooling Power Cycles A photo of an aerial view of a power plant in the middle of a solar field with rows and rows of parabolic troughs tracking. The cooling towers can be seen with the water plume rising into the air. The white water tanks can be seen in the background.

36

Sandia National Laboratories: compact linear Fresnel reflector  

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

Partnership, Renewable Energy, Research & Capabilities, Solar, Solar Newsletter, SunShot, Systems Engineering AREVA and Sandia began operations of their molten salt...

37

NREL: TroughNet - Parabolic Trough Technology Overview  

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

Technology Overview Technology Overview Parabolic trough solar power technology offers an environmentally sound and increasingly cost-effective energy source. Here you'll find overviews about the following parabolic trough power plant technologies: Solar Field Collector balance of system Concentrator structure Mirrors Receivers Thermal Energy Storage Molten-salt heat transfer fluid Storage media Storage systems Power Plant Systems Direct steam generation Fossil-fired hybrid backup Power cycles Wet and dry cooling Operation and maintenance For more detailed, technical information, see our publications on parabolic trough power plant technology. Printable Version TroughNet Home Technologies Solar Field Thermal Energy Storage Power Plant Systems Market & Economic Assessment Research & Development

38

NREL: TroughNet - Parabolic Trough Power Plant Market, Economic...  

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

factors for current parabolic trough systems under development range from 25% for solar only plants to greater than 40% for plants with thermal storage. Such plants provide...

39

NREL: TroughNet - Publications  

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

Market and economic assessment Solar data Models and tools Also see presentations and posters from past parabolic trough technology workshops. For more publications on parabolic...

40

Comparison of Fresnel concentrators for building integrated photovoltaics  

Science Journals Connector (OSTI)

To develop concentrating photovoltaic systems for building integration applications, two optical devices are proposed. The concentrators are based in stationary linear Fresnel lenses and secondary CPC. The moving focal area is ten times smaller than the Fresnel lens aperture. Concentrator characteristics are studied in detail: shadowing effect, placement of the focal area and optical concentration efficiency. The main contribution of this paper is the three-dimensional optical analysis of the non-imaging concentrating systems. In terms of solar radiation, photovoltaic moving modules placed in the focal area of stationary concentrators are compared with simply fixed photovoltaic modules. In favourable weather locations, the beam radiation incident on the concentrating modules would be a large percentage, more than 50%, of the global radiation received by the fixed photovoltaic devices.

Daniel Chemisana; Manuel Ibáñez; Jerome Barrau

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trough linear fresnel" 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

NREL: TroughNet - Parabolic Trough System and Component Testing  

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

System and Component Testing System and Component Testing Here you'll find information about parabolic trough system and components testing, as well facilities and laboratories used for testing. Tests include those for: Concentrator thermal efficiency Receiver thermal performance Mirror contour and collector alignment Mirror reflectivity and durability Some of the following documents are available as Adobe Acrobat PDFs. Download Adobe Reader. Concentrator Thermal Efficiency Testing Researchers and industry use the following facilities for testing parabolic trough collectors. AZTRAK Rotating Platform At Sandia National Laboratories' National Solar Thermal Test Facility (NSTTF), the AZTRAK rotating platform has been used to test several parabolic trough modules and receivers. Initially, researchers tested a

42

NREL: TroughNet - 2007 Parabolic Trough Technology Workshop  

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

2007 Parabolic Trough Technology Workshop 2007 Parabolic Trough Technology Workshop NREL hosted a parabolic trough technology workshop on March 8-9, 2007, in Golden, Colorado. It had three goals: Exchanging technical information Collaborating on SolarPaces projects: receiver testing and dry cooling Gathering industry input on laboratory R&D directions. The workshop featured presentations on the following parabolic trough power plant topics: Current and future market vision Project developments Solar resource assessment Technology trends Molten-salt heat transfer fluids Direct steam generation Advanced tools and testing capabilities Researchers also presented a poster session on laboratory capabilities. Note: if a presentation or poster isn't listed below, NREL hasn't yet received permission or approval to post it.

43

Fresnel lens analysis for solar energy applications  

Science Journals Connector (OSTI)

In this paper we analyze an arbitrarily shaped lineal Fresnel lens acting either as sole concentration stage or as the first stage of a two-stage concentration system in which the...

Lorenzo, E; Luque, A

1981-01-01T23:59:59.000Z

44

Advanced Low-Cost Receivers for Parabolic Troughs | Department...  

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

Receivers for Parabolic Troughs Advanced Low-Cost Receivers for Parabolic Troughs This fact sheet describes an advanced, low-cost receiver project for parabolic troughs, awarded...

45

A New Generation of Parabolic Trough Technology  

Office of Environmental Management (EM)

Trough Technology Innovat ive t echnology solut ions f or su st a in a b ilit y ABENGOA SOLAR Parabolic Trough Collector Technology Abengoa Solar Cont ent 2 Solana Solar Power...

46

241-AZ-101 pump removal trough analysis  

SciTech Connect

As part of the current Hanford mission of environmental cleanup, various long length equipment must be removed from highly radioactive waste tanks. The removal of equipment will utilize portions of the Equipment Removal System for Project W320 (ERS-W320), specifically the 50 ton hydraulic trailer system. Because the ERS-W320 system was designed to accommodate much heavier equipment it is adequate to support the dead weight of the trough, carriage and related equipment for 241AZ101 pump removal project. However, the ERS-W320 components when combined with the trough and its` related components must also be analyzed for overturning due to wind loads. Two troughs were designed, one for the 20 in. diameter carriage and one for the 36 in. diameter carriage. A proposed 52 in. trough was not designed and, therefore is not included in this document. In order to fit in the ERS-W320 strongback the troughs were design with the same widths. Structurally, the only difference between the two troughs is that more material was removed from the stiffener plates on the 36 in trough. The reduction in stiffener plate material reduces the allowable load. Therefore, only the 36 in. trough was analyzed.

Coverdell, B.L.

1995-10-17T23:59:59.000Z

47

Development of an Advanced, Low-Cost parabolic Trough Collector...  

Office of Environmental Management (EM)

Development of an Advanced, Low-Cost parabolic Trough Collector for Baseload Operation Development of an Advanced, Low-Cost parabolic Trough Collector for Baseload Operation This...

48

Project Profile: Next-Generation Parabolic Trough Collectors...  

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

Trough Collectors and Components for CSP Applications Project Profile: Next-Generation Parabolic Trough Collectors and Components for CSP Applications Abengoa logo Abengoa...

49

Concentrated solar energy applications using Fresnel lenses: A review  

Science Journals Connector (OSTI)

Solar energy concentration technology using Fresnel lens is an effective way to make full use of sunlight. This paper makes a review about the recent development of the concentrated solar energy applications using Fresnel lenses. The ongoing research and development involves imaging systems and non-imaging systems. Compared with imaging systems, non-imaging systems have the merits of larger accept angles, higher concentration ratios with less volume and shorter focal length, higher optical efficiency, etc. Concentrated photovoltaics is a major application and the highest solar-to-electric conversion efficiency based on imaging Fresnel lens and non-imaging Fresnel lens are reported as over 30% and 31.5 ± 1.7%, respectively. Moreover, both kinds of systems are widely used in other fields such as hydrogen generation, photo-bio reactors as well as photochemical reactions, surface modification of metallic materials, solar lighting and solar-pumped laser. During the recent two decades, such applications have been built and tested successfully to validate the practicality of Fresnel lens solar concentration systems. Although the present application scale is small, the ongoing research and development works suggest that Fresnel lens solar concentrators, especially non-imaging Fresnel lenses, will bring a breakthrough of commercial solar energy concentration application technology in the near future. Finally, the advantages and disadvantages of two systems are also summarized.

W.T. Xie; Y.J. Dai; R.Z. Wang; K. Sumathy

2011-01-01T23:59:59.000Z

50

Energetics of Winter Troughs Entering South America  

Science Journals Connector (OSTI)

The energetics and behavior of midtropospheric troughs over the Southern Hemisphere and their relationship with South America surface cyclogenesis were studied during the winters of 1999–2003. All surface cyclogenesis situations over Uruguay and ...

Everson Dal Piva; Manoel A. Gan; V. Brahmananda Rao

2010-04-01T23:59:59.000Z

51

Mobile trough genesis over the Mongolian Plateau  

E-Print Network (OSTI)

method developed by Lefevre and Nielsen-Gammon (1995) was used to track the mobile troughs-a quasigeostrophic potential vorticity (QGPV) and associated piecewise tendency diagnosis (PTD) technique developed by Lefevre (1995) was used to analyze...

McEver, Gregory David

2012-06-07T23:59:59.000Z

52

Lite Trough LLC | Open Energy Information  

Open Energy Info (EERE)

Lite Trough LLC Lite Trough LLC Jump to: navigation, search Name Lite Trough LLC Place Milford, Connecticut Zip 6460 Sector Solar Product Developing a parabolic trough system for Solar Thermal Electricity Generation (STEG). Coordinates 38.026545°, -77.371139° 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":38.026545,"lon":-77.371139,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

53

Cross Linear Solar Concentration System for CSP and CPV  

Science Journals Connector (OSTI)

Abstract The novel concentration system, Cross Linear (CL) system has been newly invented by Tokyo Institute of Technology. From a simulation study on how cosine effect varies with latitude, declination angle, hour angle, and tan ? (the ratio of the receiver height and the distance from mirror position to the receiver position for the receiver/mirror configuration of the CL system), it was found that the cosine factor of CL system increases with an increase in the latitude. The higher cosine factor with around 0.95 in winter months is obtained by CL system even at high latitudes. The CL system can eliminate the end loss and increase the optical efficiency compared to Trough and LFR (Linear Fresnel Reflector system). This seems to solve the problems in the concentration systems of Trough and LFR; the lower concentration efficiency (lower cosine factor) in the winter months. In addition, a higher temperature around 650 °C can be obtained with the CL system, due to the high concentration degree of CL solar reflection method. Thus, the CL system can achieve both high concentration temperature and high collection efficiency in both winter and summer seasons, even at high latitudes. Therefore the CL system seems to be the only CSP system suitable for the CSP-sites at high latitudes such as Mongolia (outer and inner), southern areas of Spain and Australia, and northern area of India. Due to the promising CL system, a joint collaboration between Japanese and Indian industries, institutes and universities has been launched to build solar plant based on CL technology. Also, the CL system also seems to be applicable for the CPV, because the coma tic aberration is very small during 9am to 3pm during the sunlight duration.

Y. Tamaura; S. Shigeta; Q.-L. Meng; T. Aiba; H. Kikura

2014-01-01T23:59:59.000Z

54

Technische und wirtschaftliche Analyse von horizontalen Fresnel-Kollektoren.  

E-Print Network (OSTI)

??Fresnel-collectors are linefocusing concentrating solar collectors for the production of process steam at temperatures up to 450°C, which can be used in solar thermal powerplants… (more)

Mertins, Max

2008-01-01T23:59:59.000Z

55

NREL: TroughNet - Data and Resources  

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

Data and Resources Data and Resources This site features data and resources about parabolic trough power plant technology, including: Industry partners U.S. power plant data Solar data Models and tools System and component testing Also see our publications on parabolic trough power plants. Printable Version TroughNet Home Technologies Market & Economic Assessment Research & Development Data & Resources Industry Partners Power Plant Data Solar Data Models & Tools System & Component Testing FAQs Workshops Publications Email Updates Did you find what you needed? Yes 1 No 0 Thank you for your feedback. Would you like to take a moment to tell us how we can improve this page? Submit We value your feedback. Thanks! We've received your feedback. Something went wrong. Please try again later.

56

Advanced Low-Cost Receivers for Parabolic Troughs | Department...  

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

Advanced Low-Cost Receivers for Parabolic Troughs Advanced Low-Cost Receivers for Parabolic Troughs This presentation was delivered at the SunShot Concentrating Solar Power (CSP)...

57

Parabolic-Trough Solar Water Heating--FTA, 022798m FTA trough  

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

Parabolic-trough solar water heating is Parabolic-trough solar water heating is a well-proven technology that directly sub- stitutes renewable energy for conventional energy in water heating. Parabolic-trough collectors can also drive absorption cooling systems or other equipment that runs off a thermal load. There is considerable potential for using these technologies at Federal facil- ities in the Southwestern United States or other areas with high direct-beam solar radi- ation. Facilities such as jails, hospitals, and barracks that consistently use large volumes of hot water are particularly good candi- dates. Use of parabolic-trough systems helps Federal facilities comply with Executive Order 12902's directive to reduce energy use by 30% by 2005 and advance other efforts to get the Federal government to set a good

58

A Non-Pyramidal Rectangular-to-Trough Waveguide Transition and Pattern Reconfigurable Trough Waveguide Antenna  

E-Print Network (OSTI)

, rods, dielectrics, and other structures can create reconfigurable periodic line sources. These trough waveguide antennas (TWA) are then capable of providing both fixedfrequency and frequency-dependent beam steering. This was originally performed using...

Loizou, Loizos

2012-02-14T23:59:59.000Z

59

NREL: TroughNet - Email Updates - Subscribe  

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

Email Updates - Subscribe Email Updates - Subscribe Subscribe to receive email updates about parabolic trough technology, including: Status on R&D and deployment projects Workshops and other events New publications New data and resources. Please provide and submit the following information. Name (first & last): Organization/Affiliation: Email Address: Submit Clear Form Unsubscribe Printable Version TroughNet Home Technologies Market & Economic Assessment Research & Development Data & Resources FAQs Workshops Publications Email Updates Did you find what you needed? Yes 1 No 0 Thank you for your feedback. Would you like to take a moment to tell us how we can improve this page? Submit We value your feedback. Thanks! We've received your feedback. Something went wrong. Please try again later.

60

Parabolic Trough Organic Rankine Cycle Power Plant  

SciTech Connect

Arizona Public Service (APS) is required to generate a portion of its electricity from solar resources in order to satisfy its obligation under the Arizona Environmental Portfolio Standard (EPS). In recent years, APS has installed and operates over 4.5 MWe of fixed, tracking, and concentrating photovoltaic systems to help meet the solar portion of this obligation and to develop an understanding of which solar technologies provide the best cost and performance to meet utility needs. During FY04, APS began construction of a 1-MWe parabolic trough concentrating solar power plant. This plant represents the first parabolic trough plant to begin construction since 1991. The plant will also be the first commercial deployment of the Solargenix parabolic trough collector technology developed under contract to the National Renewable Energy Laboratory (NREL). The plant will use an organic Rankine cycle (ORC) power plant, provided by Ormat. The ORC power plant is much simpler than a conventional steam Rankine cycle power plant and allows unattended operation of the facility.

Canada, S.; Cohen, G.; Cable, R.; Brosseau, D.; Price, H.

2005-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trough linear fresnel" 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

NREL: TroughNet - Parabolic Trough Technology Models and Software Tools  

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

Technology Models and Software Tools Technology Models and Software Tools Here you'll find information about models and software tools used to analyze parabolic trough power plant technology. They include: Annual Simulation Solar Advisor Model TRNSYS Other Analysis SolTRACE Receiver Model DView JEDI Annual Simulation Software Because solar power plants rely on an intermittent fuel supply-the sun-it is necessary to model the plant's performance on an hourly (or finer resolution) basis to understand and predict its annual performance. A number of performance and economics models are available for evaluating parabolic trough solar technologies. Industry also has developed a number of proprietary models for evaluating parabolic trough plants. Solar Advisor Model NREL, partnering with the U.S. Department of Energy's Solar Energy

62

Geothermal Literature Review At Salton Trough Geothermal Area (1984) | Open  

Open Energy Info (EERE)

Trough Geothermal Area (1984) Trough Geothermal Area (1984) Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Exploration Activity: Geothermal Literature Review At Salton Trough Geothermal Area (1984) Exploration Activity Details Location Salton Trough Geothermal Area Exploration Technique Geothermal Literature Review Activity Date 1984 Usefulness not indicated DOE-funding Unknown Notes The melt zones of volcanic clusters was analyzed with recent geological and geophysical data for five magma-hydrothermal systems were studied for the purpose of developing estimates for the depth, volume and location of magma beneath each area. References Goldstein, N. E.; Flexser, S. (1 December 1984) Melt zones beneath five volcanic complexes in California: an assessment of shallow magma occurrences

63

Parabolic Trough Solar Thermal Electric Power Plants (Fact Sheet)  

SciTech Connect

This fact sheet provides an overview of the potential for parabolic trough solar thermal electric power plants, especially in the Southwestern U.S.

Not Available

2006-07-01T23:59:59.000Z

64

Advanced Low-Cost Recievers for Parabolic Troughs  

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

PROJECT OBJECTIVES KEY RESULTS AND OUTCOMES NEXT MILESTONES 1. Burkholder F, Kutscher C. Heat Loss Testing of Schott's 2008 PTR70 Parabolic Trough Receiver (NRELTP-550-45633):...

65

Advanced Low-Cost Receivers for Parabolic Troughs  

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

PROJECT OBJECTIVES KEY RESULTS AND OUTCOMES NEXT MILESTONES 1. Burkholder F, Kutscher C. Heat Loss Testing of Schott's 2008 PTR70 Parabolic Trough Receiver (NRELTP-550-45633):...

66

Parabolic-Trough Technology Roadmap | Open Energy Information  

Open Energy Info (EERE)

Parabolic-Trough Technology Roadmap Parabolic-Trough Technology Roadmap Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Parabolic-Trough Technology Roadmap Agency/Company /Organization: National Renewable Energy Laboratory, United States Department of Energy Sector: Energy Focus Area: Renewable Energy, Solar Topics: Technology characterizations Resource Type: Guide/manual Website: www.nrel.gov/csp/troughnet/pdfs/24748.pdf References: Parabolic-Trough Technology Roadmap[1] Overview "The working group reviewed the status of today's trough technologies, evaluated existing markets, identified potential future market opportunities, and developed a roadmap toward its vision of the industry's potential-including critical advancements needed over the long term to significantly reduce costs while further increasing

67

NREL: TroughNet - Parabolic Trough Technology Solar Resource Data and Tools  

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

Solar Resource Data and Tools Solar Resource Data and Tools Here you'll find resources on solar radiation data and tools for siting parabolic trough power plants. This includes solar radiation data for power plants in the United States and worldwide. You'll also find resources for direct solar radiation instrumentation. For an overview on solar resource terms and direct beam radiation used for concentrating solar power technologies, see NREL's Shining On Web site. U.S. Solar Radiation Resource Data The following resources include maps, and hourly metrological and solar resource data for parabolic trough power plants sites in the United States. NREL Concentrating Solar Power Resource Maps Features direct normal solar radiation maps of the southwestern United States, including state maps for Arizona, California, Colorado, New Mexico,

68

A Geant4 based engineering tool for Fresnel lenses  

E-Print Network (OSTI)

Geant4 is a Monte Carlo radiation transport toolkit that is becoming a tool of generalized application in areas such as high-energy physics, nuclear physics, astroparticle physics, or medical physics. Geant4 provides an optical physics process category, allowing the simulation of the production and propagation of light. Its capabilities are well tailored for the simulation of optics systems namely in cosmic-rays experiments based in the detection of Cherenkov and fluorescence light. The use of Geant4 as an engineering tool for the optics design and simulation of Fresnel lens systems is discussed through a specific example.

João Costa; Mário Pimenta; Bernardo Tomé

2007-09-10T23:59:59.000Z

69

Guidelines for reporting parabolic trough solar electric system performance  

SciTech Connect

The purpose of this activity is to develop a generic methodology which can be used to track and compare the performance of parabolic trough power plants. The approach needs to be general enough to work for all existing and future parabolic trough plant designs, provide meaningful comparisons of year to year performance, and allow for comparisons between dissimilar plant designs. The approach presented here uses the net annual system efficiency as the primary metric for evaluating the performance of parabolic trough power plants. However, given the complex nature of large parabolic trough plants, the net annual system efficiency by itself does not adequately characterize the performance of the plant. The approach taken here is to define a number of additional performance metrics which enable a more comprehensive understanding of overall plant performance.

Price, H.W.

1997-06-01T23:59:59.000Z

70

Filamentation Time Diagnosis of Thinning Troughs and Cutoff Lows  

Science Journals Connector (OSTI)

This paper analyzes synoptic-scale trough-thinning processes using a filamentation time diagnostic. The filamentation time diagnostic is derived from the potential vorticity equation expressed in spherical coordinates in the horizontal plane and ...

Yu-Ming Tsai; Hung-Chi Kuo; Wayne H. Schubert

2010-06-01T23:59:59.000Z

71

Comparison of Fresnel lenses and parabolic mirrors as solar energy concentrators  

Science Journals Connector (OSTI)

This paper compares the gain that can be achieved with a one- or two-stage concentrator, when the first stage is a Fresnel lens or a parabolic mirror, as a function of the luminosity...

Lorenzo, E; Luque, A

1982-01-01T23:59:59.000Z

72

Status of APS 1-Mwe Parabolic Trough Project  

SciTech Connect

Arizona Public Service (APS) is currently installing new power facilities to generate a portion of its electricity from solar resources that will satisfy its obligation under the Arizona Environmental Portfolio Standard (EPS). During FY04, APS began construction on a 1-MWe parabolic trough concentrating solar power plant. This plant represents the first parabolic trough plant to begin construction since 1991. Site preparation and construction activities continued throughout much of FY05, and startup activities are planned for Fall 2005 (with completion early in FY06). The plant will be the first commercial deployment of the Solargenix parabolic trough collector technology developed under contract to the National Renewable Energy Laboratory. The plant will use an organic Rankine cycle (ORC) power plant, provided by Ormat. The ORC power plant is much simpler than the conventional steam Rankine cycle plant and allows unattended operation of the facility.

Canada, S.; Brosseau, D.; Kolb, G.; Moore, L.; Cable, R.; Price, H.

2005-11-01T23:59:59.000Z

73

Federal technology alert. Parabolic-trough solar water heating  

SciTech Connect

Parabolic-trough solar water heating is a well-proven renewable energy technology with considerable potential for application at Federal facilities. For the US, parabolic-trough water-heating systems are most cost effective in the Southwest where direct solar radiation is high. Jails, hospitals, barracks, and other facilities that consistently use large volumes of hot water are particularly good candidates, as are facilities with central plants for district heating. As with any renewable energy or energy efficiency technology requiring significant initial capital investment, the primary condition that will make a parabolic-trough system economically viable is if it is replacing expensive conventional water heating. In combination with absorption cooling systems, parabolic-trough collectors can also be used for air-conditioning. Industrial Solar Technology (IST) of Golden, Colorado, is the sole current manufacturer of parabolic-trough solar water heating systems. IST has an Indefinite Delivery/Indefinite Quantity (IDIQ) contract with the Federal Energy Management Program (FEMP) of the US Department of Energy (DOE) to finance and install parabolic-trough solar water heating on an Energy Savings Performance Contract (ESPC) basis for any Federal facility that requests it and for which it proves viable. For an ESPC project, the facility does not pay for design, capital equipment, or installation. Instead, it pays only for guaranteed energy savings. Preparing and implementing delivery or task orders against the IDIQ is much simpler than the standard procurement process. This Federal Technology Alert (FTA) of the New Technology Demonstration Program is one of a series of guides to renewable energy and new energy-efficient technologies.

NONE

1998-04-01T23:59:59.000Z

74

Modeling and co-simulation of a parabolic trough solar plant for industrial process heat  

Science Journals Connector (OSTI)

In the present paper a tri-dimensional non-linear dynamic thermohydraulic model of a parabolic trough collector was developed in the high-level acausal object-oriented language Modelica and coupled to a solar industrial process heat plant modeled in TRNSYS. The integration is performed in an innovative co-simulation environment based on the TLK interconnect software connector middleware. A discrete Monte Carlo ray-tracing model was developed in SolTrace to compute the solar radiation heterogeneous local concentration ratio in the parabolic trough collector absorber outer surface. The obtained results show that the efficiency predicted by the model agrees well with experimental data with a root mean square error of 1.2%. The dynamic performance was validated with experimental data from the Acurex solar field, located at the Plataforma Solar de Almeria, South-East Spain, and presents a good agreement. An optimization of the IST collector mass flow rate was performed based on the minimization of an energy loss cost function showing an optimal mass flow rate of 0.22 kg/s m2. A parametric analysis showed the influence on collector efficiency of several design properties, such as the absorber emittance and absorptance. Different parabolic trough solar field model structures were compared showing that, from a thermal point of view, the one-dimensional model performs close to the bi-dimensional. Co-simulations conducted on a reference industrial process heat scenario on a South European climate show an annual solar fraction of 67% for a solar plant consisting on a solar field of 1000 m2, with thermal energy storage, coupled to a continuous industrial thermal demand of 100 kW.

R. Silva; M. Pérez; A. Fernández-Garcia

2013-01-01T23:59:59.000Z

75

Concentrating Solar Power Commercial Application Study  

E-Print Network (OSTI)

Towers....................................................................... 9 Dish/Engine Systems, and dish/engine. Parabolic troughs are the most commercially available technology. Linear Fresnel and power Rankine steam cycles, similar to those used for coal and nuclear plants. Steam cycle power plants require

Laughlin, Robert B.

76

Advanced Low-Cost Receivers for Parabolic Troughs - FY13 Q2 ...  

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

Advanced Low-Cost Receivers for Parabolic Troughs - FY13 Q2 Advanced Low-Cost Receivers for Parabolic Troughs - FY13 Q2 This document summarizes the progress of this Norwich...

77

Aeolian sediment transport pathways and aerodynamics at troughs Mary C. Bourke1  

E-Print Network (OSTI)

Aeolian sediment transport pathways and aerodynamics at troughs on Mars Mary C. Bourke1 School pathways and aerodynamics at troughs on Mars, J. Geophys. Res., 109, E07005, doi:10.1029/2003JE002155. 1

Bourke, Mary C.

78

Study Of a Solar Trough Concentrating System for Application of Solar Energy Refrigeration  

Science Journals Connector (OSTI)

A solar concentrating trough device has been constructed for further application of solar heating and power system or solar refrigeration. A model for both evacuated tube and copper tube heated by solar trough co...

Li Ming; Wang Liuling; Zhou Xizheng…

2009-01-01T23:59:59.000Z

79

A study of mobile trough genesis over the Yellow Sea - East China Sea region  

E-Print Network (OSTI)

analyzed. The troughs were selected from the objective climatology of mobile troughs by Lefevre and Nielsen-Gammon (1995). A quasigeostrophic potential vorticity (QGPV) and associated piecewise tendency diagnosis (PTD) technique developed by Nielsen...

Komar, Keith Nickolas

2012-06-07T23:59:59.000Z

80

Parabolic trough solar power for competitive U.S. markets  

SciTech Connect

Nine parabolic trough power plants located in the California Mojave Desert represent the only commercial development of large-scale solar power plants to date. Although all nine plants continue to operate today, no new solar power plants have been completed since 190. Over the last several years, the parabolic trough industry has focused much of its efforts on international market opportunities. Although the power market in developing countries appears to offer a number of opportunities for parabolic trough technologies due to high growth and the availability of special financial incentives for renewables, these markets are also plagued with many difficulties for developers. In recent years, there has been some renewed interest in the U.S. domestic power market as a results of an emerging green market and green pricing incentives. Unfortunately, many of these market opportunities and incentives focus on smaller, more modular technologies (such as photovoltaics or wind power), and as a result they tend to exclude or are of minimum long-term benefit to large-scale concentrating solar power technologies. This paper looks at what is necessary for large-scale parabolic trough solar power plants to compete with state-of-the-art fossil power technology in a competitive US power market.

Price, H.W.; Kistner, R.

1999-07-01T23:59:59.000Z

Note: This page contains sample records for the topic "trough linear fresnel" 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

NREL Develops New Optical Evaluation Approach for Parabolic Trough Collectors (Fact Sheet)  

SciTech Connect

New analytical method makes it possible to carry out fast evaluation of trough collectors for design purposes.

Not Available

2012-08-01T23:59:59.000Z

82

A Review of Cold Fronts with Prefrontal Troughs and Wind Shifts DAVID M. SCHULTZ  

E-Print Network (OSTI)

A Review of Cold Fronts with Prefrontal Troughs and Wind Shifts DAVID M. SCHULTZ Cooperative with a pressure trough and a distinct wind shift at the surface. Many cold fronts, however, do not conform to this model--time series at a single surface station may possess a pressure trough and wind shift in the warm

Schultz, David

83

Seasonal variation of upper-level mobile trough development upstream of the Pacific storm track  

E-Print Network (OSTI)

of upper-level mobile troughs as they enter and exit the DZ as well as over the western Pacific, using Lefevre and Nielsen-Gammon's trough tracking data (1995). The relationship between deformation and trough intensification upstream of the Pacific storm...

Myoung, Boksoon

2012-06-07T23:59:59.000Z

84

Linear Concentrator System Basics for Concentrating Solar Power |  

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

Linear Concentrator System Basics for Concentrating Solar Power Linear Concentrator System Basics for Concentrating Solar Power Linear Concentrator System Basics for Concentrating Solar Power August 20, 2013 - 4:45pm Addthis Photo of numerous parallel rows of parabolic trough collectors tracking the sun. Cooling towers and other generator equipment are in the midst of the troughs, and two water tanks are in the background. The Solar Electric Generating Station IV power plant in California consists of many parallel rows of parabolic trough collectors that track the sun. The cooling towers can be seen with the water plume rising into the air, and white water tanks are in the background. Credit: Sandia National Laboratory / PIX 14955 Linear concentrating solar power (CSP) collectors capture the sun's energy with large mirrors that reflect and focus the sunlight onto a linear

85

Absorber Alignment Measurement Tool for Solar Parabolic Trough Collectors: Preprint  

SciTech Connect

As we pursue efforts to lower the capital and installation costs of parabolic trough solar collectors, it is essential to maintain high optical performance. While there are many optical tools available to measure the reflector slope errors of parabolic trough solar collectors, there are few tools to measure the absorber alignment. A new method is presented here to measure the absorber alignment in two dimensions to within 0.5 cm. The absorber alignment is measured using a digital camera and four photogrammetric targets. Physical contact with the receiver absorber or glass is not necessary. The alignment of the absorber is measured along its full length so that sagging of the absorber can be quantified with this technique. The resulting absorber alignment measurement provides critical information required to accurately determine the intercept factor of a collector.

Stynes, J. K.; Ihas, B.

2012-04-01T23:59:59.000Z

86

Performance contracting for parabolic trough solar thermal systems  

SciTech Connect

Several applications of solar energy have proven viable in the energy marketplace, due to competitive technology and economic performance. One example is the parabolic trough solar collectors, which use focused solar energy to maximize efficiency and reduce material use in construction. Technical improvements are complemented by new business practices to make parabolic trough solar thermal systems technically and economically viable in an ever widening range of applications. Technical developments in materials and fabrication techniques reduce production cost and expand applications from swimming pool heating and service hot water, to higher-temperature applications such as absorption cooling and process steam. Simultaneously, new financing mechanisms such as a recently awarded US Department of Energy (DOE) Federal Energy Management Program (FEMP) indefinite quantity Energy Savings Performance Contract (Super ESPC) facilitate and streamline implementation of the technology in federal facilities such as prisons and military bases.

Brown, H.; Hewett, R.; Walker, A. [National Renewable Energy Lab., Golden, CO (United States); Gee, R.; May, K. [Industrial Solar Technology, Golden, CO (United States)

1997-12-31T23:59:59.000Z

87

Parabolic Trough Solar Power Plant Simulation Model: Preprint  

SciTech Connect

As interest for clean renewable electric power technologies grows, a number of parabolic trough power plants of various configurations are being considered for deployment around the globe. It is essential that plant designs be optimized for each specific application. The optimum design must consider the capital cost, operations and maintenance cost, annual generation, financial requirements, and time-of-use value of the power generated. Developers require the tools for evaluating tradeoffs between these various project elements. This paper provides an overview of a computer model that is being used by scientists and developers to evaluate the tradeoff between cost, performance, and economic parameters for parabolic trough solar power plant technologies. An example is included that shows how this model has been used for a thermal storage design optimization.

Price, H.

2003-01-01T23:59:59.000Z

88

Optimal Heat Collection Element Shapes for Parabolic Trough Concentrators  

SciTech Connect

For nearly 150 years, the cross section of the heat collection tubes used at the focus of parabolic trough solar concentrators has been circular. This type of tube is obviously simple and easily fabricated, but it is not optimal. It is shown in this article that the optimal shape, assuming a perfect parabolic figure for the concentrating mirror, is instead oblong, and is approximately given by a pair of facing parabolic segments.

Bennett, C

2007-11-15T23:59:59.000Z

89

Specular highlights of plastic surfaces and the Fresnel Coefficient Elli Angelopoulou*  

E-Print Network (OSTI)

Specular highlights of plastic surfaces and the Fresnel Coefficient Elli Angelopoulou* and Sofya that the color of specularities for materials like plastics and ceramics can be approximated by the color by experiments performed on multispectral images of different colored plastic tiles. The refractive indices

Angelopoulou, Elli

90

Penn Engineering Alumni Society Report : October 2010 Submitted by Farnia Fresnel, President  

E-Print Network (OSTI)

Support the Career Services mentoring program Host a summer BBQ for graduate engineering studentsPenn Engineering Alumni Society Report : October 2010 Submitted by Farnia Fresnel, President http://www.seas.upenn.edu/alumni/alumnisociety The Penn Engineering Alumni Society Board is supported by more than 30 active members who attend monthly

Plotkin, Joshua B.

91

Building Envelope Design/Retrofit Utilizing Fresnel Type Overhangs in Hot Climates  

E-Print Network (OSTI)

and adaptation levels that impact occupant perception of the interior lighted space and exterior views. A realistic solution to the control of the visual environment is the Fresnel Overhang System. This element has been available for years but until recently has...

Ryan, B. J.; Griffith, J. W.

1990-01-01T23:59:59.000Z

92

Aerogel detector with a Fresnel lens focalization: a test of the concept  

SciTech Connect

We present a threshold aerogel detector that uses only the unscattered light in the aerogel, focused on a photomultiplier using a Fresnel lens. The results with n = 1.03 and 3'' photomultiplier are presented. The possibility to use 1.5'' PMT is discussed.

Sokolov, O.; Paic, G. [Instituto de Ciencias Nucleares, Universidad Nacional Autonoma de Mexico (Mexico); Alfaro, R. [Instituto de Fisica, Universidad Nacional Autonoma de Mexico (Mexico)

2008-07-02T23:59:59.000Z

93

Linear Concentrator Systems | Open Energy Information  

Open Energy Info (EERE)

Linear Concentrator Systems Linear Concentrator Systems Jump to: navigation, search Introduction Linear concentrating collector fields consist of a large number of collectors in parallel rows that are typically aligned in a north-south orientation to maximize both annual and summertime energy collection. With a single-axis sun-tracking system, this configuration enables the mirrors to track the sun from east to west during the day, ensuring that the sun reflects continuously onto the receiver tubes. Parabolic Trough Systems The predominant CSP systems currently in operation in the United States are linear concentrators using parabolic trough collectors. In such a system, the receiver tube is positioned along the focal line of each parabola-shaped reflector. The tube is fixed to the mirror structure and

94

Video Scanning Hartmann Optical Testing of State-of-the-Art Parabolic Trough Concentrators: Preprint  

SciTech Connect

This paper describes the Video Scanning Hartmann Optical Test System (VSHOT) used to optically test parabolic trough designs by both Solargenix and Industrial Solar Technology.

Wendelin, T.; May, K.; Gee, R.

2006-06-01T23:59:59.000Z

95

Two-tank indirect thermal storage designs for solar parabolic trough power plants.  

E-Print Network (OSTI)

??The performance of a solar thermal parabolic trough plant with thermal storage is dependent upon the arrangement of the heat exchangers that ultimately transfer energy… (more)

Kopp, Joseph E.

2009-01-01T23:59:59.000Z

96

Real-time video holographic system based on range camera, sub-lines and integrated Fresnel lines  

Science Journals Connector (OSTI)

A three-dimensional object scene is captured with a range camera. The recorded signal is enlarged, and converted in real-time into a Fresnel hologram with the integration of error...

Tsang, Wai Ming; Cheung, Wai Keung; Poon, Ting-Chung

97

Baseload Solar Power for California? Ammonia-based Solar Energy Storage Using Trough Concentrators  

E-Print Network (OSTI)

Baseload Solar Power for California? Ammonia-based Solar Energy Storage Using Trough Concentrators to eventually optimise the reactor geometry for ammonia-based solar energy storage with troughs, which.1. Storing Solar Energy with Ammonia H2 / N2 gas liquid NH3 Heat Exchangers Power Generation (Steam Cycle

98

Seismic reflection data analysis of the Oriente and Swan Fracture Zones bounding the Cayman Trough  

E-Print Network (OSTI)

dredgings within the trough and recovered serpentinite, orthopyroxene, clinopyroxene, spinel and probably psuedomorphs after olivine. This indicated to them that the serpentinite samples were serpentinized spinel Iherzolite. This original mineral... dredgings within the trough and recovered serpentinite, orthopyroxene, clinopyroxene, spinel and probably psuedomorphs after olivine. This indicated to them that the serpentinite samples were serpentinized spinel Iherzolite. This original mineral...

Tinker, Mary Norris

2012-06-07T23:59:59.000Z

99

Test results, Industrial Solar Technology parabolic trough solar collector  

SciTech Connect

Sandia National Laboratories and Industrial Solar Technology are cost-sharing development of advanced parabolic trough technology. As part of this effort, several configurations of an IST solar collector were tested to determine the collector efficiency and thermal losses with black chrome and black nickel receiver selective coatings, combined with aluminized film and silver film reflectors, using standard Pyrex{reg_sign} and anti-reflective coated Pyrex{reg_sign} glass receiver envelopes. The development effort has been successful, producing an advanced collector with 77% optical efficiency, using silver-film reflectors, a black nickel receiver coating, and a solgel anti-reflective glass receiver envelope. For each receiver configuration, performance equations were empirically derived relating collector efficiency and thermal losses to the operating temperature. Finally, equations were derived showing collector performance as a function of input insolation value, incident angle, and operating temperature.

Dudley, V.E. [EG and G MSI, Albuquerque, NM (United States); Evans, L.R.; Matthews, C.W. [Sandia National Labs., Albuquerque, NM (United States)

1995-11-01T23:59:59.000Z

100

Design and analysis of hydraulically driven actuation system For a parabolic solar trough  

E-Print Network (OSTI)

This thesis documents Katarina Popovic's contribution to the design of hydraulic cylinder actuation system for day to day solar trough sun tracking, a semester long project within 2.752 Development of Mechanical Products ...

Popovi?, Katarina, S.B. Massachusetts Institute of Technology

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trough linear fresnel" 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

Effects of Monsoon Trough Intraseasonal Oscillation on Tropical Cyclogenesis over the Western North Pacific  

Science Journals Connector (OSTI)

The effects of intraseasonal oscillation (ISO) of the western North Pacific (WNP) monsoon trough on tropical cyclone (TC) formation were investigated using the Advanced Research Weather Research and Forecasting (ARW) Model. A weak vortex was ...

Xi Cao; Tim Li; Melinda Peng; Wen Chen; Guanghua Chen

2014-12-01T23:59:59.000Z

102

Heat-Loss Testing of Solel's UVAC3 Parabolic Trough Receiver  

SciTech Connect

For heat-loss testing on two Solel UVAC3 parabolic trough receivers, a correlation developed predicts receiver heat loss as a function of the difference between avg absorber and ambient temperatures.

Burkholder, F.; Kutscher, C.

2008-01-01T23:59:59.000Z

103

Hard-x-ray microscopy with Fresnel zone plates reaches 40 nm Rayleigh resolution  

SciTech Connect

Substantial improvements in the nanofabrication and characteristics of gold Fresnel zone plates yielded unprecedented resolution levels in hard-x-ray microscopy. Tests performed on a variety of specimens with 8-10 keV photons demonstrated a first-order lateral resolution below 40 nm based on the Rayleigh criterion. Combined with the use of a phase contrast technique, this makes it possible to view features in the 30 nm range; good-quality images can be obtained at video rate, down to 50 ms/frame. The important repercussions on materials science, nanotechnology, and the life sciences are discussed.

Chu, Y. S.; Yi, J. M.; De Carlo, F.; Shen, Q.; Lee, Wah-Keat [Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439 (United States); Wu, H. J.; Wang, C. L.; Wang, J. Y.; Liu, C. J.; Wang, C. H. [Institute of Physics, Academia Sinica, Taipei 115, Taiwan (China); Wu, S. R.; Chien, C. C. [Institute of Physics, Academia Sinica, Taipei 115, Taiwan (China); Department of Engineering Science and System, National Tsing Hua University, Hsinchu 300, Taiwan (China); Hwu, Y. [Institute of Physics, Academia Sinica, Taipei 115, Taiwan (China); Department of Engineering Science and System, National Tsing Hua University, Hsinchu 300, Taiwan (China); Institute of Optoelectronic Sciences, National Taiwan Ocean University, Keelung 202, Taiwan (China); National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan (China); Tkachuk, A.; Yun, W.; Feser, M. [Xradia Inc., 5052 Commercial Circle, Concord, California 94520 (United States); Liang, K. S. [National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan (China); Yang, C. S. [Center for Nanomedicine, National Health Research Institutes, Miaoli 350, Taiwan (China); Je, J. H. [X-ray Imaging Center, Pohang University of Science and Technology, Pohang 790-784 (Korea, Republic of); Margaritondo, G. [Ecole Polytechnique Federale de Lausanne (EPFL), CH-1015 Lausanne (Switzerland)

2008-03-10T23:59:59.000Z

104

Design and development of a laminated Fresnel lens for point-focus PV systems. Phase II  

SciTech Connect

A laminated glass-plastic lens parquet using injection molded point focus Fresnel lenses is described. The second phase of a program aimed at investigating the cost effectiveness of a glass-plastic concentrator lens assembly is reported. The first phase dealt with the development of a first generation lens design, the selection of the preferred glass coverplate and glass-to-lens adhesive and initial injection molding lens molding trials. The second phase has dealt with the development of an improved lens design, a full size parquet lamination process, and a second group of injection molding lens molding trials.

Hodge, R.C.

1982-12-01T23:59:59.000Z

105

Demonstration of 12 nm resolution Fresnel zone plate lens based soft x-ray microscopy  

SciTech Connect

To extend soft x-ray microscopy to a resolution of order 10 nm or better, we developed a new nanofabrication process for Fresnel zone plate lenses. The new process, based on the double patterning technique, has enabled us to fabricate high quality gold zone plates with 12 nm outer zones. Testing of the zone plate with the full-field transmission x-ray microscope, XM-1, in Berkeley, showed that the lens clearly resolved 12 nm lines and spaces. This result represents a significant step towards 10 nm resolution and beyond.

Chao, W.; Kim, J.; Rekawa, S.; Fischer, P.; Anderson, E. H.

2009-06-05T23:59:59.000Z

106

Observation of Fresnel diffraction in a two-beam laser interferometer  

Science Journals Connector (OSTI)

A displacement-angle interferometer capable of 10-6 resolution in fringe division was developed for the precise measurement of the silicon (220) lattice spacing by x-ray and optical interferometry. With a view to achieving 10-8 measurement uncertainty, the interference pattern was studied by the Fresnel (Gaussian) scalar approximation of the free-space propagation of interfering beams. Imperfect alignment and diffraction phenomena having been identified, and subsequently experimentally proved, as important error sources, remedial steps were identified and taken with consequent improvement of the experiment accuracy. The investigation brought into light theoretical and experimental evidences of corrections to the interference phase which were overlooked in previous analyses.

A. Bergamin; G. Cavagnero; G. Mana

1994-03-01T23:59:59.000Z

107

Gases as Working Fluid in Parabolic Trough CSP Plants  

Science Journals Connector (OSTI)

Abstract The energetic dimension of actual economy is massively oriented towards the use of fossil fuels: they cover a share of 87% of the energy needs and the trend of this share is increasing, in spite of the commitments adopted by almost all the Countries in the World. Most crucial concern is CO2 levels in the atmosphere and the positive feedback between Earth's temperature increase and carbon. Actual technologies which make use of renewable sources seem to be not fully suitable to invert this continuous increase of fossil fuels. Concentrated Solar Power plants (CSP) have had, recently, a huge attention as a technology able to give, in the mean future, a strong contribution to the electrical energy generation. CSP technology has an intrinsic superiority with respect to the other renewable plants but actual plants suffer of many drawbacks which slow down a massive diffusion: these aspects increase costs and do not insure the reliability levels required to make the investments profitable. Gas as heat transfer fluid inside solar receiver in a CSP Parabolic Trough (PT) type plant is discussed in this paper: this would simplify actual technology in the conversion section, downstream the solar energy collecting phase. The use of gases calls for a new conversion section discussed in this paper based on a direct expansion in gas turbine plants. The success of this concept is related to the possibility to increase the fluid (gas) temperature above the actual operating maximum values. The paper discusses the performances of a new gas cycle, the performances of actual receivers when fed with gas and introduces and discusses an optimization design parameter which allows a cost decrease and industrial reliability improvement.

Roberto Cipollone; Andrea Cinocca; Angelo Gualtieri

2013-01-01T23:59:59.000Z

108

2-D X-Ray Focusing by Circular Phase Bragg-Fresnel Lenses at a Bragg Angle Close to ?/2  

Science Journals Connector (OSTI)

Two-dimensional focusing of hard X-rays has been accomplished for the first time by means of a phase Bragg-Fresnel lens with efficiency close to 40%. Images of the radiation region of a conventional X-ray tube...

V. V. Aristov; Yu. A. Basov; A. A. Snigirev; M. Belakhovsky…

1992-01-01T23:59:59.000Z

109

Research on the compensation of the end loss effect for parabolic trough solar collectors  

Science Journals Connector (OSTI)

Abstract In this paper, an optical analysis on the end loss effect of parabolic trough solar collector (PTC) with horizontal north–south axis (PTC-HNSA) is performed, and a method to compensate its end loss effect is presented. The calculation formulae for the optical end loss ratio and the increased optical efficiency (the optical collection efficiency increment of PTC system after this compensation method is used) are derived; the daily optical end loss ratio, yearly optical end loss ratio, daily increased optical efficiency and yearly increased optical efficiency in different latitudes are calculated; the variation of optical end loss ratio and increased optical efficiency with trough’s length and latitude angles are analyzed and discussed. It is indicated through the analyses that this compensation method is very applicable for regions with the latitude over 25° (especially over 30°) and short trough collectors. In order to verify the feasibility of the compensation method, a five-meter PTC-HNSA experimental system was built. The increased thermal efficiency of the experimental system is measured, and the result that the experimental value (increased thermal efficiency) substantially agreed with the theoretical value (increased optical efficiency) is gained. All these works can offer some valuable references to the further study on high-efficiency trough solar concentrating systems.

Chengmu Xu; Zhiping Chen; Ming Li; Peng Zhang; Xu Ji; Xi Luo; Jiangtao Liu

2014-01-01T23:59:59.000Z

110

Solar Trough Organic Rankine Electricity System (STORES) Stage 1: Power Plant Optimization and Economics; November 2000 -- May 2005  

SciTech Connect

Report regarding a Stage 1 Study to further develop the concept of the Solar Trough Organic Rankine Cycle Electricity Systems (STORES).

Prabhu, E.

2006-03-01T23:59:59.000Z

111

Freeze-thaw tests of trough receivers employing a molten salt working fluid.  

SciTech Connect

Several studies predict an economic benefit of using nitrate-based salts instead of the current synthetic oil within a solar parabolic trough field. However, the expected economic benefit can only be realized if the reliability and optical performance of the salt trough system is comparable to today's oil trough. Of primary concern is whether a salt-freeze accident and subsequent thaw will lead to damage of the heat collection elements (HCEs). This topic was investigated by experiments and analytical analysis. Results to date suggest that damage will not occur if the HCEs are not completely filled with salt. However, if the HCE is completely filled at the time of the freeze, the subsequent thaw can lead to plastic deformation and significant bending of the absorber tube.

Moss, Timothy A.; Iverson, Brian D.; Siegel, Nathan Phillip; Kolb, Gregory J.; Ho, Clifford Kuofei

2010-05-01T23:59:59.000Z

112

Diffractive imaging at large Fresnel number: Challenge of dynamic mesoscale imaging with hard x rays  

Science Journals Connector (OSTI)

Real materials have structure at both the atomic or crystalline scale as well as at interfaces and defects at the larger scale of grains. There is a need for the study of materials at the “mesoscale,” the scale at which subgranular physical processes and intergranular organization couple to determine microstructure, crucially impacting constitutive response at the engineering macroscale. Diffractive imaging using photons that can penetrate multiple grains of material would be a transformative technique for the study of the performance of materials in dynamic extremes. Thicker samples imply higher energy photons of shorter wavelength, and imaging of multiple grains implies bigger spot sizes. Such imaging requires the use of future planned and proposed hard x-ray free electron lasers (such as the European XFEL) to provide both the spatial coherence transverse to the large spots and the peak brilliance to provide the short illumination times. The result is that the Fresnel number of the system becomes large and is no longer in the Fraunhofer far-field limit. The interrelated issues of diffractive imaging at large Fresnel number are analyzed, including proof that diffractive imaging is possible in this limit and estimates of the signal-to-noise possible. In addition, derivation of the heating rates for brilliant pulses of x rays are presented. The potential and limitations on multiple dynamic images are derived. This paper will present a study of x-ray interactions with materials in this new regime of spatially coherent but relatively large mesoscale spots at very hard energies. It should provide the theory and design background for the experiments and facilities required to control materials in extreme environments, in particular for the next generation of very-hard-x-ray free electron lasers.

John L. Barber; Cris W. Barnes; Richard L. Sandberg; Richard L. Sheffield

2014-05-12T23:59:59.000Z

113

Fish remains (Elasmobranchii, Actinopterygii) from the Late Cretaceous of1 the Benue Trough, Nigeria2  

E-Print Network (OSTI)

Fish remains (Elasmobranchii, Actinopterygii) from the Late Cretaceous of1 the Benue Trough address: romain.vullo@univ-rennes1.fr9 10 Abstract11 Selachian and ray-finned fish remains from various Cenomanian­early Turonian and25 Maastrichtian) created opportunities for the dispersal of many marine fish

114

An Air-Based Cavity-Receiver for Solar Trough Concentrators Roman Bader  

E-Print Network (OSTI)

that uses air as the heat transfer fluid is proposed for a novel solar trough concentrator design, when the heat transfer fluid (HTF) has low volumetric heat capacity and thermal conductivity for a heat exchanger between HTF and thermal storage medium; and 4) costs for the heat transfer fluid

115

Effect of animal density and trough placement on drinking behavior and dehydration in slaughter horses  

E-Print Network (OSTI)

The effect of horse density and trough placement on aphics. latency to drink and the amount of time spent drinking water on-board a semi-trailer were determined. Three experiments using 19, 20, and 24 slaughter-type horses, ranging in body condition...

Gibbs, Amy Elizabeth

2012-06-07T23:59:59.000Z

116

OPTICAL DESIGN OF A NOVEL 2-STAGE SOLAR TROUGH CONCENTRATOR BASED ON PNEUMATIC POLYMERIC  

E-Print Network (OSTI)

of a solar thermal power plant [1,2]. An innovative concept for fabricating trough concentrators based concrete frame of rectangular shape. The advantages are five- folded: Fig. 1. Scheme of conceptual design;1) the concrete structure is more rigid and stronger than a conventional metallic frame; 2) wind induced

117

Nexant Parabolic Trough Solar Power Plant Systems Analysis; Task 3: Multiple Plants at a Common Location, 20 January 2005 - 31 December 2005  

SciTech Connect

Subcontract report by Nexant, Inc., regarding a system analysis of multiple solar parabolic trough plants at a common location.

Kelly, B.

2006-07-01T23:59:59.000Z

118

Modeling and Analysis of Stress in High Temperature Molten Salt Trough Receivers  

Science Journals Connector (OSTI)

Abstract SkyFuel has investigated the stresses and deformations occurring in parabolic trough receivers operating at temperatures above 425 °C. Operating at these temperatures allows for direct molten salt storage and higher efficiency conversion from thermal to electric energy. However, at these temperatures, the typical stainless steels used in receiver construction are susceptible to chromium carbide precipitation. After the precipitation has occurred, the steel is vulnerable to intergranular corrosion, and the fatigue strength of the steel is reduced. Corrosion increases the stresses in the receiver walls, and the reduced fatigue strength lowers the stress limit where failure will occur. This paper presents the results of an analysis of these stresses and an evaluation of the receiver material at these operating temperatures. It is shown that parabolic trough receivers can be designed to mitigate the negative effects of chromium carbide precipitation and operate above 425 °C without risk of premature failure.

Nolan Viljoen

2014-01-01T23:59:59.000Z

119

Current and future costs for parabolic trough and power tower systems in the US market.  

SciTech Connect

NREL's Solar Advisor Model (SAM) is employed to estimate the current and future costs for parabolic trough and molten salt power towers in the US market. Future troughs are assumed to achieve higher field temperatures via the successful deployment of low melting-point, molten-salt heat transfer fluids by 2015-2020. Similarly, it is assumed that molten salt power towers are successfully deployed at 100MW scale over the same time period, increasing to 200MW by 2025. The levelized cost of electricity for both technologies is predicted to drop below 11 cents/kWh (assuming a 10% investment tax credit and other financial inputs outlined in the paper), making the technologies competitive in the marketplace as benchmarked by the California MPR. Both technologies can be deployed with large amounts of thermal energy storage, yielding capacity factors as high as 65% while maintaining an optimum LCOE.

Turchi, Craig (National Renewable Energy Laboratory, Golden, CO); Kolb, Gregory J.; Mehos, Mark Steven (National Renewable Energy Laboratory, Golden, CO); Ho, Clifford Kuofei

2010-08-01T23:59:59.000Z

120

Solar trough concentration for fresh water production and waste water treatment  

Science Journals Connector (OSTI)

The present paper examines the concept of utilizing trough type solar concentration plants for water production, remediation and waste treatment. Solar trough plants are a mature technology which deserves to be diffused throughout the European Union and in the partner countries of the Mediterranean Area. The present study is intended to find applications of the solar through concentration technology beyond heat and refrigeration. At the present stage, a number of possibilities have been identified; the main ones which will be considered here are related to clean water production by processes such as solar distillation, atmospheric condensation, and waste processing. Although the technical feasibility of the proposed applications is not in discussion, before attempting to put such applications into practice, we’ll discuss their potential economical and environmental benefits in comparison to existing solutions.

A. Scrivani; T. El Asmar; U. Bardi

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trough linear fresnel" 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

Reducing the Cost of Energy from Parabolic Trough Solar Power Plants: Preprint  

SciTech Connect

Parabolic trough solar technology is the most proven and lowest cost large-scale solar power technology available today, primarily because of the nine large commercial-scale solar power plants that are operating in the California Mojave Desert. However, no new plants have been built during the past ten years because the cost of power from these plants is more expensive than power from conventional fossil fuel power plants. This paper reviews the current cost of energy and the potential for reducing the cost of energy from parabolic trough solar power plant technology based on the latest technological advancements and projected improvements from industry and sponsored R&D. The paper also looks at the impact of project financing and incentives on the cost of energy.

Price, H.; Kearney, D.

2003-01-01T23:59:59.000Z

122

Sensitivity of Concentrating Solar Power Trough Performance, Cost and Financing with Solar Advisor Model  

SciTech Connect

A comprehensive solar technology systems analysis model, the Solar Advisor Model (SAM) was developed to support the federal R&D community and the solar industry. This model, developed by staff at NREL and Sandia National Laboratory, is able to model the costs, finances, and performance of concentrating solar power and photovoltaics (PV). Currently, parabolic troughs and concentrating PV are the two concentrating technologies modeled within the SAM environment.

Blair, N.; Mehos, M.; Christensen, C.

2008-03-01T23:59:59.000Z

123

Linear Accelerator  

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

Linear Accelerator (LINAC) The core of the LANSCE facility is one of the nation's most powerful proton linear accelerators or LINAC. The LINAC at LANSCE has served the nation since...

124

Studies on performance characteristics of a solar parabolic trough concentrator with a variable area absorber  

Science Journals Connector (OSTI)

The design of a suitable absorber that incorporates an efficient heat transfer augmentation technique is one of the vital parameters that affect the performance of a solar parabolic trough concentrator (PTC). The variable area absorber discussed in this paper provides appreciable augmentation in heat transfer without increasing the pressure drop materially and thus helps in enhancing the performance efficiency of PTC significantly. A computer aided parametric study of this phenomena has been dealt in this paper. The performance of PTC of proposed design has been analysed mathematically and a rigorous simulation model has been developed. The mathematical analysis has been substantiated by elaborate experimental data.

C.M. Narayanan

2014-01-01T23:59:59.000Z

125

Efficiency of a parabolic trough collector as a water heater system in Yucatán, Mexico  

Science Journals Connector (OSTI)

The performance of a parabolic trough collector (PTC) manufactured in Merida Yucatán was evaluated under the ANSI/ASHRAE 93-1986 standard. The water heating system for testing with a constant flow limited to a maximum temperature of 55 °C was built; thus the tests were at low temperatures. Using water as working fluid it was found that the maximum efficiency of the collector was 5.43% with a flow rate of 0.022?kg/s at a direct solar irradiance with incidence angle 0°. The evaluation methodology and design of the system for testing the collector is reported in this paper.

N. Rosado Hau; M. A. Escalante Soberanis

2011-01-01T23:59:59.000Z

126

Development of Molten-Salt Heat Trasfer Fluid Technology for Parabolic Trough Solar Power Plants  

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

"This PowerPoint presentation was originally given by Dylan Grogan, principal investigator at Abengoa Solar, during a SunShot Initiative Concentrating Solar Power program review on April 24, 2013. The project, Development of Molten-Salt Heat Transfer Fluid Technology for Parabolic Trough Solar Power Plants, seeks to determine whether the inorganic fluids (molten salts) offer a sufficient reduction in levelized energy costs to pursue further development, and to develop the components required for their use. The presentation focuses on presenting conclusions from Phase 1 of the program and looks ahead to review Phase 2 activities."

127

Effect of Angle of Incidence of Sun Rays on the Bending of Absorber Tube of Solar Parabolic Trough Concentrator  

Science Journals Connector (OSTI)

Abstract In a parabolic trough system, the solar flux distribution on the surface of absorber tube is non-uniform which results in circumferential temperature gradient. Thus, bending moment is induced and leads to the deflection in absorber tube from the focal line of trough. It is concluded that during zero angle of incidence of sun rays (angle made by sun rays with trough's aperture normal), absorber tube will not deflect from the focal line. However, during non-zero angle of incidence, the absorber tube will deflect. It is because of the fact that during non-zero angle of incidence, the absorber tube does not receive any concentrated flux near the end facing the sun. In the current work, an analytical expression is derived for finding the deflection in the central axis of absorber tube from the focal line of trough. Results for deflection are plotted for different values of angle of incidence taking the dimensions of LS3 parabolic trough with Schott 2008 PTR70 receiver.

Sourav Khanna; Suneet Singh; Shireesh B. Kedare

2014-01-01T23:59:59.000Z

128

Nexant Parabolic Trough Solar Power Plant Systems Analysis; Task 2: Comparison of Wet and Dry Rankine Cycle Heat Rejection, 20 January 2005 - 31 December 2005  

SciTech Connect

Subcontract report by Nexant, Inc., regarding a system analysis comparing solar parabolic trough plants with wet and dry rankine cycle heat rejection.

Kelly, B.

2006-07-01T23:59:59.000Z

129

Technical and Economical Performance of Parabolic Trough Collector Power Plant under Algerian Climate  

Science Journals Connector (OSTI)

Parabolic trough solar technology has been proven at nine commercial Solar Electric Generating System (SEGS) power plants that are operating in the California Mojave desert. Simulation using different models when planning this kind of projects and choose the best site for this technology minimizes the risks of these projects. For this purpose, a detailed performance model of the 30 MW SEGS VI parabolic trough power plant was created in the TRNSYS simulation environment using the Solar Thermal Electric Component model library. Both solar and power cycle performance were modeled, but natural gas-fired hybrid operation was not. Good agreement between model predictions and plant measurements was found, with errors usually less than 10%. Also, an economical study has been established to determine the best site, based on the cost of electricity generation. The result shows that Bechar's site is the best site for this technology because of its lowest levelzed electricity cost and its high irradiance level. While the model could be improved, it demonstrates the capability to perform detailed analysis for this technology.

Abdelkader Zaaraoui; Mohamed Lamine Yousfi; Noureddine Said

2012-01-01T23:59:59.000Z

130

An optimized model and test of the China's first high temperature parabolic trough solar receiver  

SciTech Connect

The vacuum solar receiver is the key component of a parabolic trough solar plant, which plays a prominent role in the gross system efficiency. Recently, China's first high temperature vacuum receiver, Sanle-3 HCE, has been developed and produced by Southeast University and Sanle Electronic Group. Before being utilized in China's first parabolic trough solar plant, accurately estimating the thermal properties of this new receiver is important. This paper first establishes and optimizes a 1-D theoretical model at Matlab program to compute the receiver's major heat loss through glass envelope, and then systematically analyzes the major influence factors of heat loss. With the laboratorial steady state test stand, the heat losses of both good vacuum and non-vacuum Sanle-3 receivers were surveyed. Comparison shows the original 1-D model agrees with the ends covered test while remarkably deviating from end exposed test. For the purpose of identifying the influence of receiver's end to total heat loss, an additional 3-D model is built by CFD software to further investigate the different heat transfer processes of receiver's end components. The 3-D end model is verified by heating power and IR temperature distribution images in the test. Combining the optimized 1-D model with the new 3-D end model, the comparison with test data shows a good accordance. At the same time the heat loss curve and emittance curve of this new receiver are given and compared with those of several other existing receivers as references. (author)

Gong, Guangjie; Huang, Xinyan; Wang, Jun; Hao, Menglong [Southeast University, Nanjing (China)

2010-12-15T23:59:59.000Z

131

Life Cycle Greenhouse Gas Emissions of Trough and Tower Concentrating Solar Power Electricity Generation: Systematic Review and Harmonization  

SciTech Connect

In reviewing life cycle assessment (LCA) literature of utility-scale concentrating solar power (CSP) systems, this analysis focuses on reducing variability and clarifying the central tendency of published estimates of life cycle greenhouse gas (GHG) emissions through a meta-analytical process called harmonization. From 125 references reviewed, 10 produced 36 independent GHG emissions estimates passing screens for quality and relevance: 19 for parabolic trough (trough) technology and 17 for power tower (tower) technology. The interquartile range (IQR) of published estimates for troughs and towers were 83 and 20 grams of carbon dioxide equivalent per kilowatt-hour (g CO2-eq/kWh),1 respectively; median estimates were 26 and 38 g CO2-eq/kWh for trough and tower, respectively. Two levels of harmonization were applied. Light harmonization reduced variability in published estimates by using consistent values for key parameters pertaining to plant design and performance. The IQR and median were reduced by 87% and 17%, respectively, for troughs. For towers, the IQR and median decreased by 33% and 38%, respectively. Next, five trough LCAs reporting detailed life cycle inventories were identified. The variability and central tendency of their estimates are reduced by 91% and 81%, respectively, after light harmonization. By harmonizing these five estimates to consistent values for global warming intensities of materials and expanding system boundaries to consistently include electricity and auxiliary natural gas combustion, variability is reduced by an additional 32% while central tendency increases by 8%. These harmonized values provide useful starting points for policy makers in evaluating life cycle GHG emissions from CSP projects without the requirement to conduct a full LCA for each new project.

Burkhardt, J. J.; Heath, G.; Cohen, E.

2012-04-01T23:59:59.000Z

132

Solar Trough Power Plants: Office of Power Technologies (OPT) Success Stories Series Fact Sheet  

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

Concentrating Solar Power Program Concentrating Solar Power Program Office of Solar Energy Technologies operate for 80% of the summer mid-peak hours and 66% of the winter mid-peak hours. A natural gas backup system supplements the solar capacity and contributes 25% of the plants' annual output. The SEGS plants use parabolic-trough solar collectors to capture the sun's energy and convert it to heat. In the SEGS design, the curved solar collectors focus sunlight onto a receiver pipe. Mechanical controls slowly rotate the collectors during the day, keeping them aimed at the sun as it travels across the sky. Synthetic oil flowing through the receiver pipe serves as the heat transfer medium. The collectors concentrate sunlight 30 to 60 times the normal intensity on the receiver, heating the oil as high as 735°F (390°C).

133

Cleaning strategies for parabolic-trough solar-collector fields; guidelines for decisions  

SciTech Connect

This report is intended to assist the owner or operator of a parabolic trough solar collector system to decide on a cleaning strategy (equipment, materials, procedures, and schedules). The guidelines are based on information obtained in past research studies, as well as interviews with vendors and users of cleaning and water treatment equipment. The basic procedure recommended utilizes high pressure portable washing equipment. However, since the cleaning problem is so site-specific, no single, detailed approach can be specified. A systematic procedure for evaluating the particular requirements of a site is therefore given. This will allow the solar energy system operator to develop a cleaning strategy which is cost-effective because it is suited to local conditions.

Bergeron, K.D.; Freese, J.M.

1981-06-01T23:59:59.000Z

134

Trapping of electrons in troughs of self generated electromagnetic standing waves in a bounded plasma column  

SciTech Connect

Observations and measurements are reported on electron trapping in troughs of self-generated electromagnetic standing waves in a bounded plasma column confined in a minimum-B field. The boundaries are smaller than the free space wavelength of the waves. Earlier work of researchers primarily focused upon electron localization effects induced by purely electrostatic perturbation. We demonstrate the possibility in the presence of electromagnetic standing waves generated in the bounded plasma column. The electron trapping is verified with electrostatic measurements of the plasma floating potential, electromagnetic measurements of the wave field profile, and optical intensity measurements of Argon ionic line at 488?nm. The experimental results show a reasonably good agreement with predictions of a Monte Carlo simulation code that takes into account all kinematical and dynamical effects in the plasma in the presence of bounded waves and external fields.

Bhattacharjee, Sudeep; Sahu, Debaprasad; Pandey, Shail; Chatterjee, Sanghomitro [Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016 (India)] [Department of Physics, Indian Institute of Technology Kanpur, Kanpur 208016 (India); Dey, Indranuj [Department of Advanced Energy Engineering Science, Kyushu University, Kasuga Kouen 6-1, Kasuga City 816-8580 (Japan)] [Department of Advanced Energy Engineering Science, Kyushu University, Kasuga Kouen 6-1, Kasuga City 816-8580 (Japan); Roy Chowdhury, Krishanu [Max Planck Institute for the Physics of Complex System, Dresden 01187 (Germany)] [Max Planck Institute for the Physics of Complex System, Dresden 01187 (Germany)

2014-01-15T23:59:59.000Z

135

Modeling Photovoltaic and Concentrating Solar Power Trough Performance, Cost, and Financing with Solar Advisor Model  

SciTech Connect

A comprehensive solar technology systems analysis model, the Solar Advisor Model (SAM), has been developed to support the federal R&D community and the solar industry by staff at the National Renewable Energy Laboratory (NREL) and Sandia National Laboratory. This model is able to model the finances, incentives, and performance of flat-plate photovoltaic (PV), concentrating PV, and concentrating solar power (specifically, parabolic troughs). The primary function of the model is to allow users to investigate the impact of variations in performance, cost, and financial parameters to better understand their impact on key figures of merit. Figures of merit related to the cost and performance of these systems include, but aren't limited to, system output, system efficiencies, levelized cost of energy, return on investment, and system capital and O&M costs. SAM allows users to do complex system modeling with an intuitive graphical user interface (GUI). In fact, all tables and graphics for this paper are taken directly from the model GUI. This model has the capability to compare different solar technologies within the same interface, making use of similar cost and finance assumptions. Additionally, the ability to do parametric and sensitivity analysis is central to this model. There are several models within SAM to model the performance of photovoltaic modules and inverters. This paper presents an overview of each PV and inverter model, introduces a new generic model, and briefly discusses the concentrating solar power (CSP) parabolic trough model. A comparison of results using the different PV and inverter models is also presented.

Blair, N.; Mehos, M.; Christensen, C.; Cameron, C.

2008-01-01T23:59:59.000Z

136

Liquid cooled, linear focus solar cell receiver  

DOE Patents (OSTI)

Separate structures for electrical insulation and thermal conduction are established within a liquid cooled, linear focus solar cell receiver for use with parabolic or Fresnel optical concentrators. The receiver includes a V-shaped aluminum extrusion having a pair of outer faces each formed with a channel receiving a string of solar cells in thermal contact with the extrusion. Each cell string is attached to a continuous glass cover secured within the channel with spring clips to isolate the string from the external environment. Repair or replacement of solar cells is effected simply by detaching the spring clips to remove the cover/cell assembly without interrupting circulation of coolant fluid through the receiver. The lower surface of the channel in thermal contact with the cells of the string is anodized to establish a suitable standoff voltage capability between the cells and the extrusion. Primary electrical insulation is provided by a dielectric tape disposed between the coolant tube and extrusion. Adjacent solar cells are soldered to interconnect members designed to accommodate thermal expansion and mismatches. The coolant tube is clamped into the extrusion channel with a releasably attachable clamping strip to facilitate easy removal of the receiver from the coolant circuit.

Kirpich, Aaron S. (Broomall, PA)

1985-01-01T23:59:59.000Z

137

Liquid cooled, linear focus solar cell receiver  

DOE Patents (OSTI)

Separate structures for electrical insulation and thermal conduction are established within a liquid cooled, linear focus solar cell receiver for use with parabolic or Fresnel optical concentrators. The receiver includes a V-shaped aluminum extrusion having a pair of outer faces each formed with a channel receiving a string of solar cells in thermal contact with the extrusion. Each cell string is attached to a continuous glass cover secured within the channel with spring clips to isolate the string from the external environment. Repair or replacement of solar cells is effected simply by detaching the spring clips to remove the cover/cell assembly without interrupting circulation of coolant fluid through the receiver. The lower surface of the channel in thermal contact with the cells of the string is anodized to establish a suitable standoff voltage capability between the cells and the extrusion. Primary electrical insulation is provided by a dielectric tape disposed between the coolant tube and extrusion. Adjacent solar cells are soldered to interconnect members designed to accommodate thermal expansion and mismatches. The coolant tube is clamped into the extrusion channel with a releasably attachable clamping strip to facilitate easy removal of the receiver from the coolant circuit.

Kirpich, A.S.

1983-12-08T23:59:59.000Z

138

Simulation of solar lithium bromide–water absorption cooling system with parabolic trough collector  

Science Journals Connector (OSTI)

Ahwaz is one of the sweltering cities in Iran where an enormous amount of energy is being consumed to cool residential places in a year. The aim of this research is to simulate a solar single effect lithium bromide–water absorption cooling system in Ahwaz. The solar energy is absorbed by a horizontal N–S parabolic trough collector and stored in an insulated thermal storage tank. The system has been designed to supply the cooling load of a typical house where the cooling load peak is about 17.5 kW (5 tons of refrigeration), which occurs in July. A thermodynamic model has been used to simulate the absorption cycle. The working fluid is water, which is pumped directly to the collector. The results showed that the collector mass flow rate has a negligible effect on the minimum required collector area, but it has a significant effect on the optimum capacity of the storage tank. The minimum required collector area was about 57.6 m2, which could supply the cooling loads for the sunshine hours of the design day for July. The operation of the system has also been considered after sunset by saving solar energy.

M. Mazloumi; M. Naghashzadegan; K. Javaherdeh

2008-01-01T23:59:59.000Z

139

Heat transfer and thermodynamic performance of a parabolic trough receiver with centrally placed perforated plate inserts  

Science Journals Connector (OSTI)

Abstract In this paper, a numerical investigation of thermal and thermodynamic performance of a receiver for a parabolic trough solar collector with perforated plate inserts is presented. The analysis was carried out for different perforated plate geometrical parameters including dimensionless plate orientation angle, the dimensionless plate spacing, and the dimensionless plate diameter. The Reynolds number varies in the range 1.02 × 104 ? Re ? 7.38 × 105 depending on the heat transfer fluid temperature. The fluid temperatures used are 400 K, 500 K, 600 K and 650 K. The porosity of the plate was fixed at 0.65. The study shows that, for a given value of insert orientation, insert spacing and insert size, there is a range of Reynolds numbers for which the thermal performance of the receiver improves with the use of perforated plate inserts. In this range, the modified thermal efficiency increases between 1.2% and 8%. The thermodynamic performance of the receiver due to inclusion of perforated plate inserts is shown to improve for flow rates lower than 0.01205 m3/s. Receiver temperature gradients are shown to reduce with the use of inserts. Correlations for Nusselt number and friction factor were also derived and presented.

Aggrey Mwesigye; Tunde Bello-Ochende; Josua P. Meyer

2014-01-01T23:59:59.000Z

140

Evidence of patchy hydrogen reionization from an extreme Ly$\\alpha$ trough below redshift six  

E-Print Network (OSTI)

We report the discovery of an extremely long ($\\sim$110 Mpc/$h$) and dark ($\\tau_{\\rm eff} \\gtrsim 7$) Ly$\\alpha$ trough extending down to $z \\simeq 5.5$ towards the $z_{\\rm em} \\simeq 6.0$ quasar ULAS J0148+0600. We use these new data in combination with Ly$\\alpha$ forest measurements from 42 quasars at $4.5 \\le z_{\\rm em} \\le 6.4$ to conduct an updated analysis of the line-of-sight variance in the intergalactic Ly$\\alpha$ opacity over $4 \\le z \\le 6$. We find that the scatter in transmission among lines of sight near $z \\sim 6$ significantly exceeds theoretical expectations for either a uniform ultraviolet background (UVB) or simple fluctuating UVB models in which the mean free path to ionizing photons is spatially invariant. The data, particularly near $z \\simeq 5.6$-5.8, instead require fluctuations in the volume-weighted hydrogen neutral fraction that are a factor three or more beyond those expected from density variations alone. We argue that these fluctuations are most likely driven by large-scale vari...

Becker, George D; Madau, Piero; Pettini, Max; Ryan-Weber, Emma V; Venemans, Bram P

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trough linear fresnel" 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

Mirrors for X-ray telescopes: Fresnel diffraction-based computation of Point Spread Functions from metrology  

E-Print Network (OSTI)

The imaging sharpness of an X-ray telescope is chiefly determined by the optical quality of its focusing optics, which in turn mostly depends on the shape accuracy and the surface finishing of the grazing incidence X-ray mirrors that compose the optical modules. In order to ensure the imaging performance during the mirror manufacturing, a fundamental step is represented by the prediction of the mirror Point Spread Function (PSF) from the metrology of its surface. Traditionally, the PSF computation in X-rays is assumed to be different depending on whether the surface defects are classified as figure errors or roughness [...] The aim of this work is to overcome this limit, providing analytical formulae, valid at any light wavelength, to compute the PSF of an X-ray mirror shell from the measured longitudinal profiles and the roughness Power Spectral Density (PSD), without distinguishing spectral ranges with different treatments. The method we adopted is based on the Huygens-Fresnel principle to compute the diffr...

Raimondi, Lorenzo

2014-01-01T23:59:59.000Z

142

Feasibility Study on the Use of a Solar Thermoelectric Cogenerator Comprising a Thermoelectric Module and Evacuated Tubular Collector with Parabolic Trough Concentrator  

Science Journals Connector (OSTI)

We have designed a new solar thermoelectric cogeneration system consisting of an evacuated tubular solar collector (ETSC) with a parabolic trough concentrator (PTC) and thermoelectric modules (TEMs) to supply ...

L. Miao; M. Zhang; S. Tanemura; T. Tanaka; Y. P. Kang…

2012-06-01T23:59:59.000Z

143

Etendue-matched two-stage concentrators with multiple receivers  

SciTech Connect

A possible way to concentrate sun light is by using a Fresnel reflector: a large number of small mirrors (called heliostats) that mimic the behavior of a large concentrator, replacing it. These heliostats can move to track the sun, keeping its light concentrated onto the receiver. Fresnel concentrators, however, may have important losses. If the heliostats are spaced from each other, some light will miss them and be lost. If the heliostats are close to each other, they will block part of each other's reflected light, also producing losses. One possible way to minimize these losses is to intersect two focusing Fresnel concentrators forming a Compact Linear Fresnel Reflector - CLFR. Although improving on a simple focusing Fresnel concentrator, these optics are still not optimal. Here new geometries for Fresnel reflectors are explored, minimizing their losses and increasing their concentration. This is achieved by changing the overall shape of the primary, making it a wave-shaped trough surface and/or by allowing for a variable size and shape of the heliostats as a function of the position in the heliostat field. These new Fresnel concentrators may also be combined with secondaries significantly improving their total concentration, which now approaches the theoretical maximum. (author)

Chaves, Julio [Light Prescriptions Innovators, Edif. CeDInt, Campus Montegancedo UPM, 28223 Pozuelo de Alarcon, Madrid (Spain); Collares-Pereira, Manuel [Physics Department, IST, Technical University of Lisbon (Portugal)

2010-02-15T23:59:59.000Z

144

Photovoltaic concentrator technology development project. Sixth project integration meeting  

SciTech Connect

Thirty-three abstracts and short papers are presented which describe the current status of research, development, and demonstration of concentrator solar cell technology. Solar concentrators discussed include the parabolic trough, linear focus Fresnel lens, point focus Fresnel lens, and the parabolic dish. Solar cells studied include silicon, GaAs, and AlGaAs. Research on multiple junction cells, combined photovoltaic/thermal collectors, back contact solar cells, and beam splitter modules is described. Concentrator solar cell demonstration programs are reported. Contractor status summaries are given for 33 US DOE concentrator solar cell contracts; a description of the project, project status, and key results to date is included. (WHK)

None

1980-10-01T23:59:59.000Z

145

Life Cycle Assessment of a Parabolic Trough Concentrating Solar Power Plant and the Impacts of Key Design Alternatives  

Science Journals Connector (OSTI)

To inform capacity expansion decisions, hybrid life cycle assessment is used to evaluate a reference design of a parabolic trough concentrating solar power (CSP) facility located in Daggett, CA, along four sustainability metrics: life cycle (LC) greenhouse gas (GHG) emissions, water consumption, cumulative energy demand (CED), and energy payback time (EPBT). ... Power plant system: components typically associated with the power block (e.g., turbine generator set), in addition to other balance-of-plant components, such as buildings, roads, and parking lots. ... The majority of the remaining water consumption is attributed to water consumed during the manufacturing phase (10% of LC or 0.47 L/kWh). ...

John J. Burkhardt; III; Garvin A. Heath; Craig S. Turchi

2011-02-23T23:59:59.000Z

146

Development of Molten-Salt Heat Transfer Fluid Technology for Parabolic Trough Solar Power Plants - Public Final Technical Report  

SciTech Connect

Executive Summary This Final Report for the "Development of Molten-Salt Heat Transfer Fluid (HTF) Technology for Parabolic Trough Solar Power Plants” describes the overall project accomplishments, results and conclusions. Phase 1 analyzed the feasibility, cost and performance of a parabolic trough solar power plant with a molten salt heat transfer fluid (HTF); researched and/or developed feasible component options, detailed cost estimates and workable operating procedures; and developed hourly performance models. As a result, a molten salt plant with 6 hours of storage was shown to reduce Thermal Energy Storage (TES) cost by 43.2%, solar field cost by 14.8%, and levelized cost of energy (LCOE) by 9.8% - 14.5% relative to a similar state-of-the-art baseline plant. The LCOE savings range met the project’s Go/No Go criteria of 10% LCOE reduction. Another primary focus of Phase 1 and 2 was risk mitigation. The large risk areas associated with a molten salt parabolic trough plant were addressed in both Phases, such as; HTF freeze prevention and recovery, collector components and piping connections, and complex component interactions. Phase 2 analyzed in more detail the technical and economic feasibility of a 140 MWe,gross molten-salt CSP plant with 6 hours of TES. Phase 2 accomplishments included developing technical solutions to the above mentioned risk areas, such as freeze protection/recovery, corrosion effects of applicable molten salts, collector design improvements for molten salt, and developing plant operating strategies for maximized plant performance and freeze risk mitigation. Phase 2 accomplishments also included developing and thoroughly analyzing a molten salt, Parabolic Trough power plant performance model, in order to achieve the project cost and performance targets. The plant performance model and an extensive basic Engineering, Procurement, and Construction (EPC) quote were used to calculate a real levelized cost of energy (LCOE) of 11.50¢/kWhe , which achieved the Phase 2 Go/No Go target of less than 0.12¢/kWhe. Abengoa Solar has high confidence that the primary risk areas have been addressed in the project and a commercial plant utilizing molten salt is economically and technically feasible. The strong results from the Phase 1 and 2 research, testing, and analyses, summarized in this report, led Abengoa Solar to recommend that the project proceed to Phase 3. However, a commercially viable collector interconnection was not fully validated by the end of Phase 2, combined with the uncertainty in the federal budget, forced the DOE and Abengoa Solar to close the project. Thus the resources required to construct and operate a molten salt pilot plant will be solely supplied by Abengoa Solar.

Grogan, Dylan C. P.

2013-08-15T23:59:59.000Z

147

Research and Development of a Low Cost Solar Collector  

SciTech Connect

This is a Final Technical Report on the Research and Development completed towards the development of a Low Cost Solar Collector conducted under the DOE cost-sharing award EE-0003591. The objective of this project was to develop a new class of solar concentrators with geometries and manufacturability that could significantly reduce the fully installed cost of the solar collector field for concentrated solar thermal power plants. The goal of the project was to achieve an aggressive cost target of $170/m2, a reduction of up to 50% in the total installed cost of a solar collector field as measured against the current industry benchmark of a conventional parabolic trough. The project plan, and the detailed activities conducted under the scope of the DOE Award project addressed all major drivers that affect solar collector costs. In addition to costs, the study also focused on evaluating technical performance of new collector architectures and compared them to the performance of the industry benchmark parabolic trough. The most notable accomplishment of this DOE award was the delivery of a full-scale integrated design, manufacturing and field installation solution for a new class of solar collector architecture which has been classified as the Bi-Planar Fresnel Collector (BPFC) and may be considered as a viable alternative to the conventional parabolic trough, as well as the conventional Fresnel collectors. This was in part accomplished through the design and development, all the way through fabrication and test validation of a new class of Linear Planar Fresnel Collector architecture. This architecture offers a number of key differentiating features which include a planar light-weight frame geometry with small mass-manufacturable elements utilizing flat mirror sections. The designs shows significant promise in reducing the material costs, fabrication costs, shipping costs, and on-site field installation costs compared to the benchmark parabolic trough, as well as the conventional Fresnel collector. The noteworthy design features of the BPFC architecture include the use of relatively cheaper flat mirrors and a design which allows the mirror support beam sections to act as load-bearing structural elements resulting in more than a 36% reduction in the overall structural weight compared to an optimized parabolic trough. Also, it was shown that the utilization of small mass-produced elements significantly lowers mass-production and logistics costs that can more quickly deliver economies of scale, even for smaller installations while also reducing shipping and installation costs. Moreover, unlike the traditional Fresnel trough the BPFC architecture does not require complex articulating drive mechanisms but instead utilizes a standard parabolic trough hydraulic drive mechanism. In addition to the development of the Bi-Planar Fresnel Collector, an optimized conventional space-frame type parabolic trough was also designed, built, analyzed and field-tested during the first phase of this award. The design of the conventional space-frame parabolic collector was refined with extensive FEA and CFD analysis to reduce material costs and re-designed for simpler fabrication and more accurate lower-cost field assembly. This optimized parabolic trough represented an improvement over the state-of-the art of the traditional parabolic trough architecture and also served as a more rigorous and less subjective benchmark that was used for comparison of new candidate design architectures. The results of the expanded 1st phase of the DOE award project showed that both the Optimized Parabolic Trough and the new Bi-Planar Fresnel Collector design concepts failed to meet the primary objectives for the project of achieving a 50% cost reduction from the industry reference total installed cost of $350/m2. Results showed that the BPFC came in at projected total installed cost of $237/m2 representing a 32% savings compared to the industry benchmark conventional parabolic trough. And the cost reduction obtained by the Optimized Parabolic Trough compared to the

Ansari, Asif; Philip, Lee; Thouppuarachchi, Chirath

2012-08-01T23:59:59.000Z

148

Analytical expression for circumferential and axial distribution of absorbed flux on a bent absorber tube of solar parabolic trough concentrator  

Science Journals Connector (OSTI)

Abstract A parabolic trough has a property to concentrate the incident rays at its focal line, when tracked appropriately. The flux distribution on the absorber tube is non-uniform. Part of the absorber’s periphery facing the sun receives direct incident rays where as part of the other side receives concentrated rays resulting in circumferential non-uniform flux distribution. The intensity of flux also varies along the length of the absorber tube, especially at the sun facing end, depending upon the incidence angle of the sun rays and rim angle of the parabolic cylinder. Such non-uniformity in the flux distribution on the absorber tube leads to non-uniform temperature distribution. Thus the absorber experiences thermal stresses which may lead to bending of the tube thereby creating risk of glass cover damage. In order to estimate the extent of bending, study of the flux distribution is needed. In the present work, expression for the absorbed flux on a bent absorber tube accounting circumferential and axial variations is analytically derived. Optical errors and Gaussian sun shape have also been incorporated. Results have been plotted to study the effect of bending, optical errors and rim angle of the trough on flux distribution.

Sourav Khanna; Shireesh B. Kedare; Suneet Singh

2013-01-01T23:59:59.000Z

149

Modeling Photovoltaic and Concentrating Solar Power Trough Performance, Cost, and Financing with the Solar Advisor Model: Preprint  

SciTech Connect

A comprehensive solar technology systems analysis model, the Solar Advisor Model (SAM), has been developed to support the federal R&D community and the solar industry by staff at the National Renewable Energy Laboratory (NREL) and Sandia National Laboratory. This model is able to model the finances, incentives, and performance of flat-plate photovoltaic (PV), concentrating PV, and concentrating solar power (specifically, parabolic troughs). The primary function of the model is to allow users to investigate the impact of variations in performance, cost, and financial parameters to better understand their impact on key figures of merit. Figures of merit related to the cost and performance of these systems include, but aren't limited to, system output, system efficiencies, levelized cost of energy, return on investment, and system capital and O&M costs. There are several models within SAM to model the performance of photovoltaic modules and inverters. This paper presents an overview of each PV and inverter model, introduces a new generic model, and briefly discusses the concentrating solar power (CSP) parabolic trough model. A comparison of results using the different PV and inverter models is also presented.

Blair, N.; Mehos, M.; Christensen, C.; Cameron, C.

2008-05-01T23:59:59.000Z

150

lgebra Linear Mauro Rincon  

E-Print Network (OSTI)

8.1 Álgebra Linear Mauro Rincon Márcia Fampa Aula 8: Soluções de Sistemas de Equações Lineares #12

Cabral, Marco

151

Earlier Fresnel Lenses  

Science Journals Connector (OSTI)

Refraction occurs when a ray passes through surfaces separating materials with different indices of refraction. The contour of these surfaces define the focusing properties of the optical element. The bulk of ...

Dr. Ralf Leutz; Dr. Akio Suzuki

2001-01-01T23:59:59.000Z

152

Linear chain magnetism  

Science Journals Connector (OSTI)

Linear chain magnetism ... A brief introduction to this concept, which is also called lower dimensional magnetism. ...

Richard L. Carlin

1991-01-01T23:59:59.000Z

153

3-D Numerical Simulation of Heat Transfer and Turbulent Flow in a Receiver Tube of Solar Parabolic Trough Concentrator with Louvered Twisted-tape Inserts  

Science Journals Connector (OSTI)

Abstract High temperature and higher-thermal efficiency for CSP cycles are main goals to improve trough collector's technologies. For a parabolic trough collector the major factor for optimum heat transfer from sun to the heat transfer fluid passing in the absorber tube is to have high convection heat transfer coefficient. Literature shows that absorber tubes with various tape inserts are used and recommended to produce high convection coefficient. Typical twisted-tape (TT) enhances heat exchange between tube surface and working fluid by generating turbulent swirling flow. In this study, enhancement of convection coefficient in the receiver tube of a solar parabolic trough concentrator that the absorber tube is equipped with a new perforated louvered twisted- tape (LTT) is studied numerically. For numerical simulations three different twist ratios (TR), TR=y/W= 2.67, 4, 5.33 (y is the length required for one twist and W is the width of the tape) are used in an experimental laboratory trough collector. Flow is assumed turbulent due to louvered perforated surface and rotational shape of the tape. For thermal boundary condition, non- uniform wall solar heat flux is determined by Soltrace code on the outer surface of the absorber tube. Heat transfer rate and pressure drop are determined for fully developed condition for several Reynolds numbers based on the tube diameter and flow mean velocity. Results show that the heat transfer coefficient and pressure drop increase significantly in comparison with a typical plain twisted-tape in the tube and a plain tube.

Sh. Ghadirijafarbeigloo; A.H. Zamzamian; M. Yaghoubi

2014-01-01T23:59:59.000Z

154

Piecewise Linear Phase Transitions  

E-Print Network (OSTI)

It is shown how simple assumptions lead to piecewise linear behavior, which is observed in certain phase transitions.

Joseph B. Keller

2007-11-26T23:59:59.000Z

155

Introduction to Linear Bialgebra  

E-Print Network (OSTI)

The algebraic structure, linear algebra happens to be one of the subjects which yields itself to applications to several fields like coding or communication theory, Markov chains, representation of groups and graphs, Leontief economic models and so on. This book has for the first time, introduced a new algebraic structure called linear bialgebra, which is also a very powerful algebraic tool that can yield itself to applications. With the recent introduction of bimatrices (2005)we have ventured in this book to introduce new concepts like linear bialgebra and Smarandache neutrosophic linear bialgebra and also give the applications of these algebraic structures. It is important to mention here it is a matter of simple exercise to extend these to linear n-algebra for any n greater than 2; for n = 2 we get the linear bialgebra. This book has five chapters. In the first chapter we just introduce some basic notions of linear algebra and Slinear algebra and their applications. Chapter two introduces some new algebraic bistructures. In chapter three we introduce the notion of linear bialgebra and discuss several interesting properties about them. Also, application of linear bialgebra to bicodes is given. A remarkable part of our research in this book is the introduction of the notion of birepresentation of bigroups. The fourth chapter introduces several neutrosophic algebraic structures since they help in defining the new concept of neutrosophic linear bialgebra, neutrosophic bivector spaces, Smarandache neutrosophic linear bialgebra and Smarandache neutrosophic bivector spaces. Theirprobable applications to real-world models are discussed.

W. B. Vasantha Kandasamy; Florentin Smarandache; K. Ilanthenral

2005-08-15T23:59:59.000Z

156

Life Cycle Assessment of a Parabolic Trough Concentrating Solar Power Plant and Impacts of Key Design Alternatives: Preprint  

SciTech Connect

Climate change and water scarcity are important issues for today's power sector. To inform capacity expansion decisions, hybrid life cycle assessment is used to evaluate a reference design of a parabolic trough concentrating solar power (CSP) facility located in Daggett, California, along four sustainability metrics: life cycle greenhouse gas (GHG) emissions, water consumption, cumulative energy demand (CED), and energy payback time (EPBT). This wet-cooled, 103 MW plant utilizes mined nitrate salts in its two-tank, thermal energy storage (TES) system. Design alternatives of dry-cooling, a thermocline TES, and synthetically-derived nitrate salt are evaluated. During its life cycle, the reference CSP plant is estimated to emit 26 g CO2eq per kWh, consume 4.7 L/kWh of water, and demand 0.40 MJeq/kWh of energy, resulting in an EPBT of approximately 1 year. The dry-cooled alternative is estimated to reduce life cycle water consumption by 77% but increase life cycle GHG emissions and CED by 8%. Synthetic nitrate salts may increase life cycle GHG emissions by 52% compared to mined. Switching from two-tank to thermocline TES configuration reduces life cycle GHG emissions, most significantly for plants using synthetically-derived nitrate salts. CSP can significantly reduce GHG emissions compared to fossil-fueled generation; however, dry-cooling may be required in many locations to minimize water consumption.

Heath, G. A.; Burkhardt, J. J.; Turchi, C. S.

2011-09-01T23:59:59.000Z

157

History of Proton Linear Accelerators  

E-Print Network (OSTI)

much. References 1. Linear Accelerators, edited by P. M .at the 1986 Linear Accelerator Conference, SLAC, Stanford,HISTORY OF PROTON LINEAR ACCELERATORS Luis W. Alvarez TWO-

Alvarez, Luis W.

1987-01-01T23:59:59.000Z

158

Performance model and annual yield comparison of parabolic-trough solar thermal power plants with either nitrogen or synthetic oil as heat transfer fluid  

Science Journals Connector (OSTI)

Abstract The majority of commercial parabolic-trough plants in the world operate with synthetic oil as heat transfer fluid in the solar field. However, the synthetic oils that are available at affordable cost present some challenges such as their flammability, environmental toxicity and a temperature limitation of around 400 °C. As alternative, this work proposes the use of pressurized nitrogen as heat transfer fluid. In order to analyze the feasibility of this technology, a comparison between a plant with nitrogen and a conventional plant with synthetic oil has been carried out. In both cases, 50 MWe parabolic-trough plants with 6 h of thermal storage are used as reference. A performance model including the solar field, the thermal storage system and the power block has been developed for each plant in the TRNSYS simulation software. This paper also describes the specifications, design and sizing of the solar field and explains the basic operation strategy applied in each model. Both annual simulations have been performed considering the same location, Almería (Spain), and meteorological data. In summary, the results show that similar net annual electricity productions can be attained for parabolic-trough plants with the same collection area using either nitrogen or synthetic oil as heat transfer fluid.

Mario Biencinto; Lourdes González; Eduardo Zarza; Luis E. Díez; Javier Muñoz-Antón

2014-01-01T23:59:59.000Z

159

Unit I-2 Linear Maps 1 Linear maps  

E-Print Network (OSTI)

Unit I-2 Linear Maps 1 Unit I-2 Linear maps Unit I-2 Linear Maps 2 Linear map · V & U are vector spaces over the same scalars · a function f: VU is a linear map if it preserves the vector space transformation [particularly when f: RnRm] ­ linear operator when f: V V [same v.s.] ­ linear mapping ­ linear

Birkett, Stephen

160

lgebra Linear Mauro Rincon  

E-Print Network (OSTI)

10.1 Álgebra Linear Mauro Rincon Márcia Fampa Aula 10: Determinantes #12;10.2 8.1 - Definições #12

Cabral, Marco

Note: This page contains sample records for the topic "trough linear fresnel" 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

Linear Graphene Plasmons  

Science Journals Connector (OSTI)

The coupling of the plasmon spectra of graphene and a nearby thick plasma is examined here in detail. The coupled modes include linear plasmons. Keywords: Graphene, plasmons, surface

N. J.M. Horing

2010-11-01T23:59:59.000Z

162

Focusing in Linear Accelerators  

DOE R&D Accomplishments (OSTI)

Review of the theory of focusing in linear accelerators with comments on the incompatibility of phase stability and first-order focusing in a simple accelerator.

McMillan, E. M.

1950-08-24T23:59:59.000Z

163

Linear phase compressive filter  

DOE Patents (OSTI)

A phase linear filter for soliton suppression is in the form of a laddered series of stages of non-commensurate low pass filters with each low pass filter having a series coupled inductance (L) and a reverse biased, voltage dependent varactor diode, to ground which acts as a variable capacitance (C). L and C values are set to levels which correspond to a linear or conventional phase linear filter. Inductance is mapped directly from that of an equivalent nonlinear transmission line and capacitance is mapped from the linear case using a large signal equivalent of a nonlinear transmission line.

McEwan, Thomas E. (Livermore, CA)

1995-01-01T23:59:59.000Z

164

Using Linearity Web Copyright 2007  

E-Print Network (OSTI)

Using Linearity Web Rev. 2.0 May 2007 Copyright © 2007 #12;Using Linearity Web i Contents Introduction to Linearity Web.............................................................................1 Features, Benefits, and Value of Linearity Web..............................................1 Before You

Rodriguez, Carlos

165

SLAC linear collider  

SciTech Connect

A brief description of the proposed SLAC Linear Collider is given. This machine would investigate the possibilities and limitations of Linear Colliders while at the same time producing thousands of Z/sup 0/ particles per day for the study of the weak interactions.

Hollebeek, R.

1980-06-01T23:59:59.000Z

166

NREL: Concentrating Solar Power Research - Data and Resources  

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

Data and Resources Data and Resources For concentrating solar power technologies, NREL features the following online solar radiation resource data and solar resource maps, as well as data for renewable energy power plants. Also see TroughNet's data and resources specifically for parabolic trough technology. Concentrating Solar Power Projects around the World NREL, in conjunction with SolarPACES (Solar Power and Chemical Energy Systems), maintains a database of CSP projects around the world with plants that are either operational, under construction, or under development. CSP technologies include parabolic trough, linear Fresnel reflector, power tower, and dish/engine systems. Each project profile includes background information, a listing of project participants, and data on the power-plant

167

North Linear Accelerator  

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

North Linear Accelerator North Linear Accelerator Building Exterior Beam Enclosure Level Walk to the North Spreader North Recombiner Extras! North Linear Accelerator The North Linear Accelerator is one of the two long, straight sections of Jefferson Lab's accelerator. Electrons gain energy in this section by passing through acceleration cavities. There are 160 cavities in this straightaway, all lined up end to end. That's enough cavities to increase an electron's energy by 400 million volts each time it passes through this section. Electrons can pass though this section as many as five times! The cavities are powered by microwaves that travel down the skinny rectangular pipes from the service buildings above ground. Since the cavities won't work right unless they are kept very cold, they

168

Syntactic edges and linearization  

E-Print Network (OSTI)

In this thesis, I investigate the question of how the units of a linguistic expression are linearly ordered in syntax. In particular, I examine interactions between locality conditions on movement and the mapping between ...

Ko, Heejeong

2005-01-01T23:59:59.000Z

169

Nexant Parabolic Trough Solar Power Plant Systems Analysis; Task 1: Preferred Plant Size, 20 January 2005 - 31 December 2005  

SciTech Connect

The Rankine cycles for commercial parabolic trough solar projects range in capacity from 13.5 MWe at the Solar Electric Generating Station I (SEGS I) plant, to a maximum of 89 MWe at the SEGS VIII/IX plants. The series of SEGS projects showed a consistent reduction in the levelized energy cost due to a combination of improvements in collector field technology and economies of scale in both the Rankine cycle and the operation and maintenance costs. Nonetheless, the question of the optimum Rankine cycle capacity remains an open issue. The capacities of the SEGS VIII/IX plants were limited by Federal Energy Regulatory Commission and Public Utility Regulatory Policy Act requirements to a maximum net output of 80 MWe. Further improvements in the Rankine cycle efficiency, and economies of scale in both the capital and the operating cost, should be available at larger plant sizes. An analysis was conducted to determine the effect of Rankine cycle capacities greater than 80 MWe on the levelized energy cost. The study was conducted through the following steps: (1) Three gross cycle capacities of 88 MWe, 165 MWe, and 220 MWe were selected. (2) Three Rankine cycle models were developed using the GateCycle program. The models were based on single reheat turbine cycles, with main steam conditions of 1,450 lb{sub f}/in{sup 2} and 703 F, and reheat steam conditions of 239 lb{sub f}/in{sup 2} and 703 F. The feedwater heater system consisted of 5 closed heaters and 1 open deaerating heater. The design condenser pressure was 2.5 in. HgA. (3) The optimization function within Excelergy was used to determine the preferred solar multiple for each plant. Two cases were considered for each plant: (a) a solar-only project without thermal storage, and (b) a solar-fossil hybrid project, with 3 hours of thermal storage and a heat transport fluid heater fired by natural gas. (4) For each of the 6 cases, collector field geometries, heat transport fluid pressure losses, and heat transport pump power requirements were calculated with a field piping optimization model. (5) Annual electric energy outputs, capital costs, and annual operating costs were calculated for each case using the default methods within Excelergy, from which estimates of the levelized energy costs were developed. The plant with the lowest energy cost was considered the optimum.

Kelly, B.

2006-07-01T23:59:59.000Z

170

3D Thermal-structural Analysis of an Absorber Tube of a Parabolic Trough Collector and the Effect of Tube Deflection on Optical Efficiency  

Science Journals Connector (OSTI)

Abstract In this paper deformation rate of an absorber tube of a parabolic trough collector due to a 3D solar flux density distribution is studied theoretically. Three dimensional temperature distribution and tube thermal expansion due to non-uniform solar flux over the tube are determined numerically. The local concentration ratio for the parabolic trough collectors, which is a key boundary condition in the thermal analysis is computed by Monte Carlo Ray Tracing method for different conditions. The governing equations of thermo-elastic constitutive are solved in three dimensions for steady state thermal and static structural analysis with appropriate boundary condition using Finite Volume and Finite Element numerical codes. Thermal stresses and strain are determined for two types of collectors; first one is a constructed collector and second one is under construction at Shiraz (Iran) solar thermal power plant. Results of the local concentration ratio, flux density, temperature distribution and thermal expansions are determined for the designed conditions. Appropriate flow rate and convection coefficient for each season are found in order to decrease tube bending, prevent optical efficiency drop of collectors, keep high factor of safety, and reduce cyclic daily amplitude motion which lead to longer life time of absorber tube.

S.M. Akbarimoosavi; M. Yaghoubi

2014-01-01T23:59:59.000Z

171

Linear Logic as CSP  

Science Journals Connector (OSTI)

......research-article Original Articles Linear Logic as CSP ERIC MONTEIRO Department of Informatics...translation from such proofs into a corresponding CSP process is offered. It is shown that the...between the cut elimination process and the CSP execution. Generalizations and related......

ERIC MONTEIRO

1994-08-01T23:59:59.000Z

172

Linear Programming Environmental  

E-Print Network (OSTI)

Linear Program to control air pollution was developed in 1968 by Teller, which minimized cost Fall 2006 #12;Topics · Introduction · Background · Air · Land · Water #12;Introduction · "The United States spends more than 2% of its gross domestic product on pollution control, and this is more than any

Nagurney, Anna

173

Microtopographic characterization of ice-wedge polygon landscape in Barrow, Alaska: a digital map of troughs, rims, centers derived from high resolution (0.25 m) LiDAR data  

DOE Data Explorer (OSTI)

The dataset represents microtopographic characterization of the ice-wedge polygon landscape in Barrow, Alaska. Three microtopographic features are delineated using 0.25 m high resolution digital elevation dataset derived from LiDAR. The troughs, rims, and centers are the three categories in this classification scheme. The polygon troughs are the surface expression of the ice-wedges that are in lower elevations than the interior polygon. The elevated shoulders of the polygon interior immediately adjacent to the polygon troughs are the polygon rims for the low center polygons. In case of high center polygons, these features are the topographic highs. In this classification scheme, both topographic highs and rims are considered as polygon rims. The next version of the dataset will include more refined classification scheme including separate classes for rims ad topographic highs. The interior part of the polygon just adjacent to the polygon rims are the polygon centers.

Gangodagamage, Chandana; Wullschleger, Stan

174

Microtopographic characterization of ice-wedge polygon landscape in Barrow, Alaska: a digital map of troughs, rims, centers derived from high resolution (0.25 m) LiDAR data  

SciTech Connect

The dataset represents microtopographic characterization of the ice-wedge polygon landscape in Barrow, Alaska. Three microtopographic features are delineated using 0.25 m high resolution digital elevation dataset derived from LiDAR. The troughs, rims, and centers are the three categories in this classification scheme. The polygon troughs are the surface expression of the ice-wedges that are in lower elevations than the interior polygon. The elevated shoulders of the polygon interior immediately adjacent to the polygon troughs are the polygon rims for the low center polygons. In case of high center polygons, these features are the topographic highs. In this classification scheme, both topographic highs and rims are considered as polygon rims. The next version of the dataset will include more refined classification scheme including separate classes for rims ad topographic highs. The interior part of the polygon just adjacent to the polygon rims are the polygon centers.

Gangodagamage, Chandana; Wullschleger, Stan

2014-07-03T23:59:59.000Z

175

Linear induction accelerator  

DOE Patents (OSTI)

A linear induction accelerator includes a plurality of adder cavities arranged in a series and provided in a structure which is evacuated so that a vacuum inductance is provided between each adder cavity and the structure. An energy storage system for the adder cavities includes a pulsed current source and a respective plurality of bipolar converting networks connected thereto. The bipolar high-voltage, high-repetition-rate square pulse train sets and resets the cavities. 4 figs.

Buttram, M.T.; Ginn, J.W.

1988-06-21T23:59:59.000Z

176

Combustion powered linear actuator  

DOE Patents (OSTI)

The present invention provides robotic vehicles having wheeled and hopping mobilities that are capable of traversing (e.g. by hopping over) obstacles that are large in size relative to the robot and, are capable of operation in unpredictable terrain over long range. The present invention further provides combustion powered linear actuators, which can include latching mechanisms to facilitate pressurized fueling of the actuators, as can be used to provide wheeled vehicles with a hopping mobility.

Fischer, Gary J. (Albuquerque, NM)

2007-09-04T23:59:59.000Z

177

Linear Concentrator System Basics for Concentrating Solar Power...  

Office of Environmental Management (EM)

towers and other generator equipment are in the midst of the troughs, and two water tanks are in the background. The Solar Electric Generating Station IV power plant in...

178

Minimum entropy generation due to heat transfer and fluid friction in a parabolic trough receiver with non-uniform heat flux at different rim angles and concentration ratios  

Science Journals Connector (OSTI)

Abstract In this paper, Monte Carlo ray-tracing and computational fluid dynamics are used to numerically investigate the minimum entropy generation due to heat transfer and fluid friction in a parabolic trough receiver. The analysis was carried out for rim angles in the range 40°–120°, concentration ratios in the range 57–143, Reynolds numbers in the range 1.02 × 104–1.36 × 106 and fluid temperatures in the range 350–650 K. Results show existence of an optimal Reynolds number at any given combination of fluid temperature, concentration ratio and rim angle for which the total entropy generation is a minimum. The total entropy generation was found to increase as the rim angle reduced, concentration ratio increased and fluid temperature reduced. The high entropy generation rates at low rim angles are mainly due to high peak temperatures in the absorber tube at these low rim angles.

Aggrey Mwesigye; Tunde Bello-Ochende; Josua P. Meyer

2014-01-01T23:59:59.000Z

179

Solar aided power generation of a 300 MW lignite fired power plant combined with line-focus parabolic trough collectors field  

Science Journals Connector (OSTI)

Abstract Nowadays, conventional coal or gas fired power plants are the dominant way to generate electricity in the world. In recent years there is a growth in the field of renewable energy sources in order to avoid the threat of climate change from fossil fuel combustion. Solar energy, as an environmental friendly energy source, may be the answer to the reduction of global CO2 emissions. This paper presents the concept of Solar Aided Power Generation (SAPG), a combination of renewable and conventional energy sources technologies. The operation of the 300 MW lignite fired power plant of Ptolemais integrated with a solar field of parabolic trough collectors was simulated using TRNSYS software in both power boosting and fuel saving modes. The power plant performance, power output variation, fuel consumption and CO2 emissions were calculated. Furthermore, an economic analysis was carried out for both power boosting and fuel saving modes of operation and optimum solar contribution was estimated.

G.C. Bakos; Ch. Tsechelidou

2013-01-01T23:59:59.000Z

180

The Whitehorse Trough is an early Mesozoic marine sedimentary basin, which extends from southern Yukon to Dease Lake in British Columbia. This paper outlines the stratigraphy and structure, and characterises the overall petroleum  

E-Print Network (OSTI)

and structure, and characterises the overall petroleum resource potential of the central Whitehorse Trough component of the stratigraphy. Potential petroleum traps are provided by antiforms, thrust faults stratigraphique de Inklin. Le thème du gaz BULLETIN OF CANADIAN PETROLEUM GEOLOGY VOL. 53, NO. 2 (JUNE, 2005), P

Johnston, Stephen T.

Note: This page contains sample records for the topic "trough linear fresnel" 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

Collectors R&D for CSP Systems  

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

Collectors—whether for trough, tower (heliostat), linear Fresnel or dish systems—comprise up to 40% of the total system costs for concentrating solar power (CSP) technologies. The DOE SunShot CSP Program seeks to dramatically reduce the cost of the collector field while improving optical accuracy and ensuring durability. The SunShot Initiative funds research and development (R&D) on collector systems and related aspects within the industry, national laboratories and universities to achieve the following technical targets of collector subsystems toward the SunShot goals.

182

History of Proton Linear Accelerators  

E-Print Network (OSTI)

the board to show why the accelerator couldn't work. Then atmuch. References 1. Linear Accelerators, edited by P. M .at the 1986 Linear Accelerator Conference, SLAC, Stanford,

Alvarez, Luis W.

1986-01-01T23:59:59.000Z

183

History of Proton Linear Accelerators  

DOE R&D Accomplishments (OSTI)

Some personal recollections are presented that relate to the author`s experience developing linear accelerators, particularly for protons. (LEW)

Alvarez, L. W.

1987-01-00T23:59:59.000Z

184

Linear concentrating solar collector  

SciTech Connect

The present invention relates to a segment of a linear concentrating solar collector which includes two plates distanced from each other and extending parallel to each other; a member connects the plates to each other and holes are bored in each of the plates in a parallel manner along a parabolic curve. A member passes through the holes each holding a small strip made of a reflecting material all strips together forming a parabolic surface. The invention relates also to a collector comprising at least two of each segments and an absorber extending along the focus line of the entire collector. The collector is advantageously provided with horizontal and/or vertical members which ascertains that the collector can follow the position of the sun.

Aharon, N. B.

1985-08-06T23:59:59.000Z

185

Linear and Non Linear Analysis of the Hadley Circulation  

Science Journals Connector (OSTI)

We present a synthesis of results obtained with the linear stability of the one-cell Hadley circulation. This flow is observe in the...

P. Laure; B. Roux

1990-01-01T23:59:59.000Z

186

Berkeley Proton Linear Accelerator  

DOE R&D Accomplishments (OSTI)

A linear accelerator, which increases the energy of protons from a 4 Mev Van de Graaff injector, to a final energy of 31.5 Mev, has been constructed. The accelerator consists of a cavity 40 feet long and 39 inches in diameter, excited at resonance in a longitudinal electric mode with a radio-frequency power of about 2.2 x 10{sup 6} watts peak at 202.5 mc. Acceleration is made possible by the introduction of 46 axial "drift tubes" into the cavity, which is designed such that the particles traverse the distance between the centers of successive tubes in one cycle of the r.f. power. The protons are longitudinally stable as in the synchrotron, and are stabilized transversely by the action of converging fields produced by focusing grids. The electrical cavity is constructed like an inverted airplane fuselage and is supported in a vacuum tank. Power is supplied by 9 high powered oscillators fed from a pulse generator of the artificial transmission line type.

Alvarez, L. W.; Bradner, H.; Franck, J.; Gordon, H.; Gow, J. D.; Marshall, L. C.; Oppenheimer, F. F.; Panofsky, W. K. H.; Richman, C.; Woodyard, J. R.

1953-10-13T23:59:59.000Z

187

Unit I-3 Linear Independence & Bases 1 Linear independence & bases  

E-Print Network (OSTI)

} ­ so we can write u1 = c2u2 + c3u3 + ... + crur with not all ci = 0 ­ re-arranging gives a non-zero lc u1 - c2u2 - c3u3 - ... - crur = 0 so the vectors are linearly dependent ! Unit I-3 Linear

Birkett, Stephen

188

Techno-economic assessment of substituting natural gas based heater with thermal energy storage system in parabolic trough concentrated solar power plant  

Science Journals Connector (OSTI)

Abstract Parabolic-trough (PT) concentrated solar power (CSP) plants are very vulnerable to daily fluctuations in solar radiation. This dependence can be mitigated through a hybridization of solar energy with natural gas based heaters that supply thermal energy during the night or whenever solar irradiance level is dimmed. However, there is more sustainable way for CSP plants to avoid power-generation-outages caused by transient weather conditions, i.e. installation of thermal energy storage (TES). Such a system stores surplus thermal energy provided by solar field during sunny hours and discharges it when the sun is not available. Shams-1 PT plant in Madinat-Zayed, United-Arab-Emirates (UAE) has two natural gas based components, i.e. steam-booster heater and heat transfer fluid (HTF) heater. In the current study, model of Shams-1 was developed and analyzed in the System Advisor Model (SAM) software. It has been attempted to replace the HTF heater with TES. A parametric study has been conducted to determine the size of the TES as well as the solar field such that the specified power target demand would be satisfied. The results of the parametric analysis showed that TES can't completely replace the HTF heater, within reasonable sizes. Nevertheless, consequent simulations depicts that TES increases the capacity factor on one hand and decreases fuel consumption on the other hand.

V. Poghosyan; Mohamed I. Hassan

2015-01-01T23:59:59.000Z

189

LCA (Life Cycle Assessment) of Parabolic Trough CSP: Materials Inventory and Embodied GHG Emissions from Two-Tank Indirect and Thermocline Thermal Storage (Presentation)  

SciTech Connect

In the United States, concentrating solar power (CSP) is one of the most promising renewable energy (RE) technologies for reduction of electric sector greenhouse gas (GHG) emissions and for rapid capacity expansion. It is also one of the most price-competitive RE technologies, thanks in large measure to decades of field experience and consistent improvements in design. One of the key design features that makes CSP more attractive than many other RE technologies, like solar photovoltaics and wind, is the potential for including relatively low-cost and efficient thermal energy storage (TES), which can smooth the daily fluctuation of electricity production and extend its duration into the evening peak hours or longer. Because operational environmental burdens are typically small for RE technologies, life cycle assessment (LCA) is recognized as the most appropriate analytical approach for determining their environmental impacts of these technologies, including CSP. An LCA accounts for impacts from all stages in the development, operation, and decommissioning of a CSP plant, including such upstream stages as the extraction of raw materials used in system components, manufacturing of those components, and construction of the plant. The National Renewable Energy Laboratory (NREL) is undertaking an LCA of modern CSP plants, starting with those of parabolic trough design.

Heath, G.; Burkhardt, J.; Turchi, C.; Decker, T.; Kutscher, C.

2009-07-20T23:59:59.000Z

190

Effects of environmental factors on the conversion efficiency of solar thermoelectric co-generators comprising parabola trough collectors and thermoelectric modules without evacuated tubular collector  

Science Journals Connector (OSTI)

Abstract Solar thermoelectric co-generators (STECGs) are an attractive means of supplying electric power and heat simultaneously and economically. Here we examine the effects of environmental factors on the conversion efficiencies of a new type of STECG comprising parabolic trough concentrators and thermoelectric modules (TEMs). Each TEM array was bonded with a solar selective absorber plate and directly positioned on the focal axis of the parabolic concentrator. Glass tubular collectors were not used to encase the TEMs. Although this makes the overall system simpler, the environmental effects become significant. Simulations show that the performance of such a system strongly depends on ambient conditions such as solar insolation, atmospheric temperature and wind velocity. As each of these factors increases, the thermal losses of the STECG system also increase, resulting in reduced solar conversion efficiency, despite the increased radiation absorption. However, the impact of these factors is relatively complicated. Although the electrical efficiency of the system increases with increasing solar insolation, it decreases with increasing ambient temperature and wind velocity. These results serve as a useful guide to the selection and installation of STECGs, particularly in Guangzhou or similar climate region.

Chao Li; Ming Zhang; Lei Miao; Jianhua Zhou; Yi Pu Kang; C.A.J. Fisher; Kaoru Ohno; Yang Shen; Hong Lin

2014-01-01T23:59:59.000Z

191

Testing thermocline filler materials and molten-salt heat transfer fluids for thermal energy storage systems used in parabolic trough solar power plants.  

SciTech Connect

Parabolic trough power systems that utilize concentrated solar energy to generate electricity are a proven technology. Industry and laboratory research efforts are now focusing on integration of thermal energy storage as a viable means to enhance dispatchability of concentrated solar energy. One option to significantly reduce costs is to use thermocline storage systems, low-cost filler materials as the primary thermal storage medium, and molten nitrate salts as the direct heat transfer fluid. Prior thermocline evaluations and thermal cycling tests at the Sandia National Laboratories' National Solar Thermal Test Facility identified quartzite rock and silica sand as potential filler materials. An expanded series of isothermal and thermal cycling experiments were planned and implemented to extend those studies in order to demonstrate the durability of these filler materials in molten nitrate salts over a range of operating temperatures for extended timeframes. Upon test completion, careful analyses of filler material samples, as well as the molten salt, were conducted to assess long-term durability and degradation mechanisms in these test conditions. Analysis results demonstrate that the quartzite rock and silica sand appear able to withstand the molten salt environment quite well. No significant deterioration that would impact the performance or operability of a thermocline thermal energy storage system was evident. Therefore, additional studies of the thermocline concept can continue armed with confidence that appropriate filler materials have been identified for the intended application.

Kelly, Michael James; Hlava, Paul Frank; Brosseau, Douglas A.

2004-07-01T23:59:59.000Z

192

Utility-Scale Concentrating Solar Power and Photovoltaic Projects: A Technology and Market Overview  

SciTech Connect

Over the last several years, solar energy technologies have been, or are in the process of being, deployed at unprecedented levels. A critical recent development, resulting from the massive scale of projects in progress or recently completed, is having the power sold directly to electric utilities. Such 'utility-scale' systems offer the opportunity to deploy solar technologies far faster than the traditional 'behind-the-meter' projects designed to offset retail load. Moreover, these systems have employed significant economies of scale during construction and operation, attracting financial capital, which in turn can reduce the delivered cost of power. This report is a summary of the current U.S. utility-scale solar state-of-the-market and development pipeline. Utility-scale solar energy systems are generally categorized as one of two basic designs: concentrating solar power (CSP) and photovoltaic (PV). CSP systems can be further delineated into four commercially available technologies: parabolic trough, central receiver (CR), parabolic dish, and linear Fresnel reflector. CSP systems can also be categorized as hybrid, which combine a solar-based system (generally parabolic trough, CR, or linear Fresnel) and a fossil fuel energy system to produce electric power or steam.

Mendelsohn, M.; Lowder, T.; Canavan, B.

2012-04-01T23:59:59.000Z

193

[New technology for linear colliders  

SciTech Connect

This report discusses the following topics on research of microwave amplifiers for linear colliders: Context in current microwave technology development; gated field emission for microwave cathodes; cathode fabrication and tests; microwave cathode design using field emitters; and microwave localization.

McIntyre, P.M.

1992-08-12T23:59:59.000Z

194

Linear actuator powered flapping wing  

E-Print Network (OSTI)

Small scale unmanned aerial vehicles (UAVs) have proven themselves to be useful, but often too noisy for certain operations due to their rotary motors. This project examined the feasibility of using an almost silent linear ...

Benson, Christopher Lee

2010-01-01T23:59:59.000Z

195

linear-elements-code.scm  

E-Print Network (OSTI)

(o Linear-finite-element-operator)) ;; initialize various fields that depend on the space ;; if coefficients is not defined, we set it to arrays of floating-point ;; zeros ...

196

Highly linear low noise amplifier  

E-Print Network (OSTI)

, the Low Noise Amplifier (LNA) is expected to provide high linearity, thus preventing the intermodulation tones created by the interference signal from corrupting the carrier signal. The research focuses on designing a novel LNA which achieves high...

Ganesan, Sivakumar

2007-09-17T23:59:59.000Z

197

Linear Accelerator | Advanced Photon Source  

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

(MeV). At 450 MeV, the electrons are relativistic: they are traveling at >99.999% of the speed of light, which is 299,792,458 meters second (186,000 milessecond). Photo: Linear...

198

Linear Collider Collaboration Tech Notes  

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

6, 27/05/99 6, 27/05/99 Tolerances of Random RF Jitters in X-Band Main Linacs May 27, 1999 Kiyoshi KUBO KEK Tsukuba, Japan Abstract: Tracking simulations have been performed for the main linacs of an X-band linear collider. We discuss the choice of phase of the accelerating field relative to the bunches. The tolerances of the phase and the amplitude errors are studied. Tolerances of Random RF Jitters in X-Band Main Linacs K. Kubo, KEK Abstract Tracking simulations have been performed for main linacs of X-band linear collider. We discuss about choice of the phase of the accelerating field relative to the bunches. The tolerances of the phase and the amplitude errors are studied. 1 INTRODUCTION In order to preserve the low emittance through the main linacs of future linear colliders, various effects

199

Independent Oversight Inspection, Stanford Linear Accelerator...  

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

Stanford Linear Accelerator Center - January 2007 January 2007 Inspection of Environment, Safety, and Health Programs at the Stanford Linear Accelerator Center This report...

200

Linear operator inequalities for strongly stable weakly regular linear systems  

E-Print Network (OSTI)

that A has compact resolvent and its eigenvectors form a Riesz basis for the state space, we give an explicit to a spectral factorization problem and to a lin- ear quadratic optimal control problem. More concretely R, which implies that R #21; 0. The associated linear matrix inequality in the unknown self

Curtain, Ruth F.

Note: This page contains sample records for the topic "trough linear fresnel" 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

Basic Control of Parabolic Troughs  

Science Journals Connector (OSTI)

The chapter outlines the main features of the different modeling and basic control approaches used during the last 25 years to control the distributed collector systems (DCS). The DCS may be described by a dis...

Prof. Eduardo F. Camacho; Manuel Berenguel…

2012-01-01T23:59:59.000Z

202

Sandia National Laboratories: Trough Systems  

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

Doppler Velocimeter EC Top Publications A Comparison of Platform Options for Deep-water Floating Offshore Vertical Axis Wind Turbines: An Initial Study Nonlinear Time-Domain...

203

Transformations for densities Linear transformations  

E-Print Network (OSTI)

' & $ % Lecture 28 Transformations for densities Linear transformations 1-1 differentiable functions General transformations Expectation of a function 1 #12;' & $ % Transformations for discrete transformation of a U[0, 1] · Take X U[0, 1], so that fX(x) = 1 0 0 and set Y

Adler, Robert J.

204

Linear Collider Collaboration Tech Notes  

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

Notes Notes LCC - 0018, 15/06/99 Rev B, June 2002 Correct Account of RF Deflections in Linac Acceleration June 15, 1999 G.V. Stupakov Stanford Linear Accelerator Center Stanford, California Abstract: During acceleration in the linac structure, the beam not only increases its longitudinal momentum, but also experiences a transverse kick from the accelerating mode which is linear in accelerating gradient. This effect is neglected in such computer codes as LIAR and TRANSPORT. We derived the Hamiltonian equations that describe the effect of RF deflection into the acceleration process and included it into the computational engine of LIAR. By comparing orbits for the NLC main linac, we found that the difference between the two algorithms is about 10\%. The effect will be more pronounced at smaller

205

Precision linear ramp function generator  

DOE Patents (OSTI)

A ramp function generator is provided which produces a precise linear ramp function which is repeatable and highly stable. A derivative feedback loop is used to stabilize the output of an integrator in the forward loop and control the ramp rate. The ramp may be started from a selected baseline voltage level and the desired ramp rate is selected by applying an appropriate constant voltage to the input of the integrator.

Jatko, W.B.; McNeilly, D.R.; Thacker, L.H.

1984-08-01T23:59:59.000Z

206

Cast dielectric composite linear accelerator  

DOE Patents (OSTI)

A linear accelerator having cast dielectric composite layers integrally formed with conductor electrodes in a solventless fabrication process, with the cast dielectric composite preferably having a nanoparticle filler in an organic polymer such as a thermosetting resin. By incorporating this cast dielectric composite the dielectric constant of critical insulating layers of the transmission lines of the accelerator are increased while simultaneously maintaining high dielectric strengths for the accelerator.

Sanders, David M. (Livermore, CA); Sampayan, Stephen (Manteca, CA); Slenes, Kirk (Albuquerque, NM); Stoller, H. M. (Albuquerque, NM)

2009-11-10T23:59:59.000Z

207

Segmented rail linear induction motor  

DOE Patents (OSTI)

A segmented rail linear induction motor has a segmented rail consisting of a plurality of nonferrous electrically conductive segments aligned along a guideway. The motor further includes a carriage including at least one pair of opposed coils fastened to the carriage for moving the carriage. A power source applies an electric current to the coils to induce currents in the conductive surfaces to repel the coils from adjacent edges of the conductive surfaces.

Cowan, Jr., Maynard (1107 Stagecoach Rd. SE., Albuquerque, NM 87123); Marder, Barry M. (1412 Pinnacle View Dr. NE., Albuquerque, NM 87123)

1996-01-01T23:59:59.000Z

208

Segmented rail linear induction motor  

DOE Patents (OSTI)

A segmented rail linear induction motor has a segmented rail consisting of a plurality of nonferrous electrically conductive segments aligned along a guideway. The motor further includes a carriage including at least one pair of opposed coils fastened to the carriage for moving the carriage. A power source applies an electric current to the coils to induce currents in the conductive surfaces to repel the coils from adjacent edges of the conductive surfaces. 6 figs.

Cowan, M. Jr.; Marder, B.M.

1996-09-03T23:59:59.000Z

209

Dereverberation by linear systems techniques  

E-Print Network (OSTI)

- sentation by a finite number of thin layers and wave propagation normal to these layers. A linear, recursive mathematical model is developed and a method for the identification of parameters in the absence of noise i. , discussed. Appli ations are made...--Final System Configuration 29 16. Water Model--System Flow Diagram 17. The A Matrix 18. The B, C, and D Matrices 31 32 33 I. INTROD&JCTIO22 The removal of deleterious effects which arise in the transmission of waves through layered media is a problem...

Schell, John August

1970-01-01T23:59:59.000Z

210

Unit I-4 More about linear maps 1 More about linear maps  

E-Print Network (OSTI)

Unit I-4 More about linear maps 1 Unit I-4 More about linear maps Unit I-4 More about linear maps 2 Using bases to define linear maps · V, U vector spaces · a unique linear map T: V U is determined · if v = a1v1 + ... + anvn then T(v) = a1T(v1) + ... + anT(vn) Unit I-4 More about linear maps 3 Example

Birkett, Stephen

211

Cryogenic technology boosts linear accelerator capability  

Science Journals Connector (OSTI)

Cryogenic technology boosts linear accelerator capability ... Two critical properties of matter at cryogenic temperatures—superconductivity and superfluidity—should open the way for a major advance in electron linear accelerator capability. ...

1968-05-06T23:59:59.000Z

212

Ultrashort Pulse Propagation in the Linear Regime  

E-Print Network (OSTI)

First, we investigate the Bouguer-Lambert-Beer (BLB) law as applied to the transmission of ultrashort pulses through water in the linear absorption regime. We present a linear theory for propagation of ultrashort laser pulses, and related...

Wang, Jieyu

2010-07-14T23:59:59.000Z

213

New architecture for RF power amplifier linearization  

E-Print Network (OSTI)

Power amplifier linearization has become an important part of the transmitter system as 3G and developing 4G communication standards require higher linearity than ever before. The thesis proposes two power amplifier ...

Boo, Hyun H

2009-01-01T23:59:59.000Z

214

The Next Linear Collider Program  

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

To use the left side navigation on this page, you will need to turn on To use the left side navigation on this page, you will need to turn on Javascript. You do not need JavaScript to use the text-based navigation bar at the bottom of the page. The Next Linear Collider at SLAC Navbar MISSION: Scientists expect research at this facility to answer fundamental questions about the behavior of matter and the origins of the Universe. NLC 8-Pack on the Drawing Board What's New In the Next Linear Collider: • NLC Newsletter October, 2001 • NLC Snowmass report 2001 • NLC All Hands Talk, August 2001 Upcoming Events: • Fall 2001 Working Sessions, Oct. 22-23, 2001 • Pulse Compression Workshop, Oct. 22-24, 2001 • Machine Advisory Committee Mtg., Oct. 24-26, 2001 • ISG-7 at KEK, Nov. 12-15, 2001 • LC' 02 at SLAC, Feb. 4-8, 2002 NLC Website Search: Entire SLAC Web | Help |

215

Challenges in future linear colliders  

SciTech Connect

For decades, electron-positron colliders have been complementing proton-proton colliders. But the circular LEP, the largest e-e+ collider, represented an energy limit beyond which energy losses to synchrotron radiation necessitate moving to e-e+ linear colliders (LCs), thereby raising new challenges for accelerator builders. Japanese-American, German, and European collaborations have presented options for the Future Linear Collider (FLC). Key accelerator issues for any FLC option are the achievement of high enough energy and luminosity. Damping rings, taking advantage of the phenomenon of synchrotron radiation, have been developed as the means for decreasing beam size, which is crucial for ensuring a sufficiently high rate of particle-particle collisions. Related challenges are alignment and stability in an environment where even minute ground motion can disrupt performance, and the ability to monitor beam size. The technical challenges exist within a wider context of socioeconomic and political challenges, likely necessitating continued development of international collaboration among parties involved in accelerator-based physics.

Swapan Chattopadhyay; Kaoru Yokoya

2002-09-02T23:59:59.000Z

216

Repair of overheating linear accelerator  

SciTech Connect

Los Alamos Neutron Science Center (LANSCE) is a proton accelerator that produces high energy particle beams for experiments. These beams include neutrons and protons for diverse uses including radiography, isotope production, small feature study, lattice vibrations and material science. The Drift Tube Linear Accelerator (DTL) is the first portion of a half mile long linear section of accelerator that raises the beam energy from 750 keV to 100 MeV. In its 31st year of operation (2003), the DTL experienced serious issues. The first problem was the inability to maintain resonant frequency at full power. The second problem was increased occurrences of over-temperature failure of cooling hoses. These shortcomings led to an investigation during the 2003 yearly preventative maintenance shutdown that showed evidence of excessive heating: discolored interior tank walls and coper oxide deposition in the cooling circuits. Since overheating was suspected to be caused by compromised heat transfer, improving that was the focus of the repair effort. Investigations revealed copper oxide flow inhibition and iron oxide scale build up. Acid cleaning was implemented with careful attention to protection of the base metal, selection of components to clean and minimization of exposure times. The effort has been very successful in bringing the accelerator through a complete eight month run cycle allowing an incredible array of scientific experiments to be completed this year (2003-2004). This paper will describe the systems, investigation analysis, repair, return to production and conclusion.

Barkley, Walter; Baldwin, William; Bennett, Gloria; Bitteker, Leo; Borden, Michael; Casados, Jeff; Fitzgerald, Daniel; Gorman, Fred; Johnson, Kenneth; Kurennoy, Sergey; Martinez, Alberto; O’Hara, James; Perez, Edward; Roller, Brandon; Rybarcyk, Lawrence; Stark, Peter; Stockton, Jerry

2004-01-01T23:59:59.000Z

217

General linear methods for Volterra integral equations  

Science Journals Connector (OSTI)

We investigate the class of general linear methods of order p and stage order q=p for the numerical solution of Volterra integral equations of the second kind. Construction of highly stable methods based on the Schur criterion is described and examples ... Keywords: Convolution test equation, General linear methods, Linear stability analysis, Order conditions, Volterra integral equations

G. Izzo; Z. Jackiewicz; E. Messina; A. Vecchio

2010-09-01T23:59:59.000Z

218

Linear Collider Collaboration Tech Notes  

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

1 1 May 2001 Lattice Description for NLC Damping Rings at 120 Hz Andrzej Wolski Lawrence Berkeley National Laboratory Abstract: We present a lattice design for the NLC Main Damping Rings at 120 Hz repe tition rate. A total wiggler length of a little over 46 m is needed to achieve the damping time required for extracted, normalized, vertical emittance below 0.02 mm mrad. The dynamic aperture (using a linear model for the wiggler) is in excess of 15 times the injected beam size. The principal lattice parameters and characteristics are presented in this note; we also outline results of studies of alignment and field quality tolerances. CBP Tech Note-227 LCC-0061 Lattice Description for NLC Main Damping Rings at 120 Hz Andrzej Wolski Lawrence Berkeley National Laboratory

219

Linear Collider Collaboration Tech Notes  

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

0 0 April 2001 Rev.1 July 2003 Guide to LIBXSIF, a Library for Parsing the Extended Standard Input Format of Accelerated Beamlines Peter G. Tenenbaum Stanford Linear Accelerator Center Stanford University Stanford, CA Abstract: We describe LIBXSIF, a standalone library for parsing the Extended Standard Input Format of accelerator beamlines. Included in the description are: documentation of user commands; full description of permitted accelerator elements and their attributes; the construction of beamline lists; the mechanics of adding LIBXSIF to an existing program; and "under the hood" details for users who wish to modify the library or are merely morbidly curious. Guide to LIBXSIF, a Library for Parsing the Extended Standard Input Format of

220

Linear Collider Collaboration Tech Notes  

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

NLC Home Page NLC Technical SLAC The LCC Tech Note series was started in July 1998 to document the JLC/NLC collaborative design effort. The notes are numbered sequentially and may also be given a SLAC, FNAL, LBNL, LLNL and/or KEK publication number. The LCC notes will be distributed through the Web in electronic form as PDF files -- the authors are responsible for keeping the original documents. Other document series are the NLC Notes that were started for the SLAC ZDR, the KEK ATF Notes, and at some future time there should be a series of Technical (NLD) Notes to document work on detector studies for the next-generation linear collider. LCC-0001 "Memorandum of Understanding between KEK and SLAC," 2/98. LCC-0002 "Transparencies and Summaries from the 1st ISG meeting: January 1998," G. Loew, ed., 2/98.

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


221

Linear Collider Collaboration Tech Notes  

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

5 08//00 5 08//00 Study of Beam Energy Spectrum Measurement in the NLC Extraction Line August 2000 Yuri Nosochkov and Tor Raubenheimer Stanford Linear Accelerator Center Stanford, CA Abstract: The NLC extraction line optics includes a secondary focal point with a very small _- function and 2 cm dispersion which can be used for measurement of outgoing beam energy spread. In this study, we performed tracking simulations to transport the NLC disrupted beam from the Interaction Point (IP) to the extraction line secondary focus (the IP image), `measure' the transverse beam pro_le at the IP image and reconstruct the beam energy spectrum. The resultant distribution was compared with the original energy spectrum at the IP. Study of Beam Energy Spectrum Measurement

222

Linear Collider Collaboration Tech Notes  

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

2 03/12/99 2 03/12/99 PEP-II RF Cavity Revisited December 3, 1999 R. Rimmer, G. Koehler, D. Li, N. Hartmann, N. Folwell, J. Hodgson, B. McCandless Lawrence Berkeley National Laboratory Stanford Linear Accelerator Center Berkeley, CA, USA Stanford, CA, USA Abstract: This report describes the results of numerical simulations of the PEP-II RF cavity performed after the completion of the construction phase of the project and comparisons are made to previous calculations and measured results. These analyses were performed to evaluate new calculation techniques for the HOM distribution and RF surface heating that were not available at the time of the original design. These include the use of a high frequency electromagnetic element in ANSYS and the new Omega 3P code to study wall

223

Linear Collider Collaboration Tech Notes  

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

4, 10/03/00 4, 10/03/00 Luminosity for NLC Design Variations March 10, 1999 K.A. Thompson and T.O. Raubenheimer Stanford Linear Accelerator Center Stanford, CA, USA Abstract: In this note we give Guineapig simulation results for the luminosity and luminosity spectrum of three baseline NLC designs at 0.5~TeV and 1.0~TeV and compare the simulation results with analytic approximations. We examine the effects of varying several design parameters away from the NLC-B-500 and NLC-B-1000 designs, in order to study possible trade-offs of parameters that could ease tolerances, increase luminosity, or help to optimize machine operation for specific physics processes. Luminosity for NLC Design Variations K.A. Thompson and T.O.Raubenheimer INTRODUCTION In this note we give Guineapig [l] simulation results for the luminosity and

224

Reticle stage based linear dosimeter  

DOE Patents (OSTI)

A detector to measure EUV intensity employs a linear array of photodiodes. The detector is particularly suited for photolithography systems that includes: (i) a ringfield camera; (ii) a source of radiation; (iii) a condenser for processing radiation from the source of radiation to produce a ringfield illumination field for illuminating a mask; (iv) a reticle that is positioned at the ringfield camera's object plane and from which a reticle image in the form of an intensity profile is reflected into the entrance pupil of the ringfield camera, wherein the reticle moves in a direction that is transverse to the length of the ringfield illumination field that illuminates the reticle; (v) detector for measuring the entire intensity along the length of the ringfield illumination field that is projected onto the reticle; and (vi) a wafer onto which the reticle imaged is projected from the ringfield camera.

Berger, Kurt W. (Livermore, CA)

2007-03-27T23:59:59.000Z

225

Linear Collider Collaboration Tech Notes  

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

Notes Notes LCC - 0038 29/04/00 CBP Tech Note - 234 Transverse Field Profile of the NLC Damping Rings Electromagnet Wiggler 29 April 2000 17 J. Corlett and S. Marks Lawrence Berkeley National Laboratory M. C. Ross Stanford Linear Accelerator Center Stanford, CA Abstract: The primary effort for damping ring wiggler studies has been to develop a credible radiation hard electromagnet wiggler conceptual design that meets NLC main electron and positron damping ring physics requirements [1]. Based upon an early assessment of requirements, a hybrid magnet similar to existing designs satisfies basic requirements. However, radiation damage is potentially a serious problem for the Nd-Fe-B permanent magnet material, and cost remains an issue for samarium cobalt magnets. Superconducting magnet designs have not been

226

On extreme Bosonic linear channels  

E-Print Network (OSTI)

The set of all channels with fixed input and output is convex. We first give a convenient formulation of necessary and sufficient condition for a channel to be extreme point of this set in terms of complementary channel, a notion of big importance in quantum information theory. This formulation is based on the general approach to extremality of completely positive maps in an operator algebra due to Arveson. We then apply this formulation to prove the main result of this note: under certain nondegeneracy conditions, purity of the environment is necessary and sufficient for extremality of Bosonic linear (quasi-free) channel. It follows that Gaussian channel between finite-mode Bosonic systems is extreme if and only if it has minimal noise.

A. S. Holevo

2011-11-15T23:59:59.000Z

227

Linear Transformer Ideal Transformer Consider linear and ideal transformers attached to Circuit 1 and Circuit 2.  

E-Print Network (OSTI)

Linear Transformer Ideal Transformer I1 + V2 _ + V1 _ Consider linear and ideal transformers in linear transformer equations for :MLL ,, 21 ( ) ( ) ( ) ( ) ( ) ( ) 12212212 2 1 112 2 12 2 1 2212 2 PP Now solve the linear transformer equations for the currents: 1 212 2 22 2 1 2 1 212 2 22 12 2 2 2

Kozick, Richard J.

228

International Workshop on Linear Colliders 2010  

ScienceCinema (OSTI)

IWLC2010 International Workshop on Linear Colliders 2010ECFA-CLIC-ILC joint meeting: Monday 18 October - Friday 22 October 2010Venue: CERN and CICG (International Conference Centre Geneva, Switzerland) This year, the International Workshop on Linear Colliders organized by the European Committee for Future Accelerators (ECFA) will study the physics, detectors and accelerator complex of a linear collider covering both CLIC and ILC options.Contact Workshop Secretariat  IWLC2010 is hosted by CERN

None

2011-10-06T23:59:59.000Z

229

Linear degeneracy in the semiclassical atom  

Science Journals Connector (OSTI)

If the angular and radial quantum numbers of states with the same binding energy satisfy a linear relation, as is the situation in the Coulomb potential, the spectrum is said to be linearly degenerate. We present a detailed study of the consequences of such linear degeneracy in atomic potentials. One of the results is a new, and more general, derivation of Scott’s correction to the Thomas-Fermi energy.

Berthold-Georg Englert and Julian Schwinger

1985-07-01T23:59:59.000Z

230

Subcritical Fission Reactor Based on Linear Collider  

E-Print Network (OSTI)

The beams of Linear Collider after main collision can be utilized to build an accelerator--driven sub--critical reactor.

I. F. Ginzburg

2005-07-29T23:59:59.000Z

231

Linear PM Generator for Wave Energy Conversion.  

E-Print Network (OSTI)

??The main objective of this thesis is to design a selected version of linear PM generator and to determine the electromechanical characteristics at variable operating… (more)

Parthasarathy, Rajkumar

2012-01-01T23:59:59.000Z

232

Ultra-high vacuum photoelectron linear accelerator  

DOE Patents (OSTI)

An rf linear accelerator for producing an electron beam. The outer wall of the rf cavity of said linear accelerator being perforated to allow gas inside said rf cavity to flow to a pressure chamber surrounding said rf cavity and having means of ultra high vacuum pumping of the cathode of said rf linear accelerator. Said rf linear accelerator is used to accelerate polarized or unpolarized electrons produced by a photocathode, or to accelerate thermally heated electrons produced by a thermionic cathode, or to accelerate rf heated field emission electrons produced by a field emission cathode.

Yu, David U.L.; Luo, Yan

2013-07-16T23:59:59.000Z

233

Huge market forecast for linear LDPE  

Science Journals Connector (OSTI)

Huge market forecast for linear LDPE ... It now appears that the success of the new technology, which rests largely on energy and equipment cost savings, could be overwhelming. ...

1980-08-25T23:59:59.000Z

234

LED Replacements for Linear Fluorescent Lamps Webcast  

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

In this June 20, 2011 webcast on LED products marketed as replacements for linear fluorescent lamps, Jason Tuenge of the Pacific Northwest National Laboratory (PNNL) discussed current Lighting...

235

Local Linear Learned Image Processing Pipeline  

Science Journals Connector (OSTI)

The local linear learned (L3) algorithm is presented that simultaneously performs the demosaicking, denoising, and color transform calculations of an image processing pipeline for a...

Lansel, Steven; Wandell, Brian

236

Optimization Online - Accelerated Linearized Bregman Method  

E-Print Network (OSTI)

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

Bo Huang

2011-06-27T23:59:59.000Z

237

The Linear Engine Pathway of Transformation  

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

This poster highlights the major milestones in the history of the linear engine in terms of technological advances, novel designs, and economic/social impact.

238

Linear conic optimization for nonlinear optimal control  

E-Print Network (OSTI)

Jul 7, 2014 ... 3Faculty of Electrical Engineering, Czech Technical University in Prague, ..... This linear transport equation is classical in fluid mechanics, ...

2014-07-07T23:59:59.000Z

239

Voltage regulation in linear induction accelerators  

DOE Patents (OSTI)

Improvement in voltage regulation in a Linear Induction Accelerator wherein a varistor, such as a metal oxide varistor, is placed in parallel with the beam accelerating cavity and the magnetic core. The non-linear properties of the varistor result in a more stable voltage across the beam accelerating cavity than with a conventional compensating resistance.

Parsons, William M. (Santa Fe, NM)

1992-01-01T23:59:59.000Z

240

Voltage regulation in linear induction accelerators  

DOE Patents (OSTI)

Improvement in voltage regulation in a linear induction accelerator wherein a varistor, such as a metal oxide varistor, is placed in parallel with the beam accelerating cavity and the magnetic core is disclosed. The non-linear properties of the varistor result in a more stable voltage across the beam accelerating cavity than with a conventional compensating resistance. 4 figs.

Parsons, W.M.

1992-12-29T23:59:59.000Z

Note: This page contains sample records for the topic "trough linear fresnel" 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

NONEQUILIBRIUM LINEAR BEHAVIOR OF BIOLOGICAL SYSTEMS  

E-Print Network (OSTI)

-phosphorylation in mitochondria (2, 3), sodium transport in frog skin, toad bladder (4) and toad skin (5), and hydrogen ion transport in turtle bladder (6). Linearity has also been noted in a synthetic membrane exhibiting active transport (7). (Linearity as used in these papers and here implies the flow, J, is related to the force, A1

Stanley, H. Eugene

242

Soft materials for linear electromechanical energy conversion  

E-Print Network (OSTI)

We briefly review the literature of linear electromechanical effects of soft materials, especially in synthetic and biological polymers and liquid crystals (LCs). First we describe results on direct and converse piezoelectricity, and then we discuss a linear coupling between bending and electric polarization, which maybe called bending piezoelectricity, or flexoelectricity.

Antal Jakli; Nandor Eber

2014-07-29T23:59:59.000Z

243

Decomposing Linear Programs for Parallel Solution?  

E-Print Network (OSTI)

Decomposing Linear Programs for Parallel Solution? Ali P nar, Umit V. Catalyurek, Cevdet Aykanat in the solution of Linear Programming (LP) problems with block angular constraint matrices has been exploited industrial applications and the advent of powerful computers have in- creased the users' ability to formulate

�atalyürek, �mit V.

244

Decomposing Linear Programs for Parallel Solution ?  

E-Print Network (OSTI)

Decomposing Linear Programs for Parallel Solution ? Ali Pinar, ¨ Umit V. C¸ ataly¨urek, Cevdet in the solution of Linear Programming (LP) problems with block angular constraint matrices has been exploited with successful industrial applications and the advent of powerful computers have in­ creased the users' ability

�atalyürek, �mit V.

245

Non-linear wave equations Hans Ringstrom  

E-Print Network (OSTI)

105 3. Power type non-linearities 108 4. Global existence for small data 109 5. Observations the Maxwell vacuum equations for an electric and magnetic potential also yields wave equations. In order differential equations (PDE:s) is quite big. The linear theory is based on the fact that by adding two

Ringström, Hans

246

Non-linear wave equations Hans Ringstrom  

E-Print Network (OSTI)

105 3. Power type non-linearities 108 4. Global existence for small data 109 5. Observations boundary conditions. Formulating the Maxwell vacuum equations for an electric and magnetic potential also di#11;erential equations (PDE:s) is quite big. The linear theory is based on the fact that by adding

Ringström, Hans

247

Limma: Linear Models for Microarray Data  

E-Print Network (OSTI)

397 23 Limma: Linear Models for Microarray Data Gordon K. Smyth Abstract A survey is given correction and control spots in conjunction with linear modelling is illustrated on the 7 data. 23.1 Introduction Limma1 is a package for differential expression analysis of data arising from microarray

Smyth, Gordon K.

248

Independent Oversight Inspection, Stanford Linear Accelerator Center -  

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

Stanford Linear Accelerator Stanford Linear Accelerator Center - January 2007 Independent Oversight Inspection, Stanford Linear Accelerator Center - January 2007 January 2007 Inspection of Environment, Safety, and Health Programs at the Stanford Linear Accelerator Center The U.S. Department of Energy (DOE) Office of Independent Oversight, within the Office of Health, Safety and Security, conducted an inspection of environment, safety, and health (ES&H) programs at the DOE Stanford Linear Accelerator Center (SLAC) during October and November 2006. The inspection was performed by Independent Oversight's Office of Environment, Safety and Health Evaluations. Since the 2004 Type A electrical accident, SSO and SLAC have made improvements in many aspects of ES&H programs. However, the deficiencies in

249

Linear Transformations In this Chapter, we will define the notion of a linear transformation between  

E-Print Network (OSTI)

Chapter 6 Linear Transformations In this Chapter, we will define the notion of a linear transformation between two vector spaces V and W which are defined over the same field and prove the most basic transformations is equivalent to matrix theory. We will also study the geometric properties of linear

Carrell, Jim

250

Drivers and Barriers in the Current Concentrated Solar Power (CSP) Market  

Open Energy Info (EERE)

Drivers and Barriers in the Current Concentrated Solar Power (CSP) Market Drivers and Barriers in the Current Concentrated Solar Power (CSP) Market (Webinar) Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Drivers and Barriers in the Current Concentrated Solar Power (CSP) Market (Webinar) Focus Area: Solar Topics: Market Analysis Website: www.leonardo-energy.org/webinar-drivers-and-barriers-current-csp-marke Equivalent URI: cleanenergysolutions.org/content/drivers-and-barriers-current-concentr Language: English Policies: Regulations Regulations: Mandates/Targets This video teaches users about the four major types of concentrating solar power technologies (CSP): parabolic trough, tower concentrators, linear Fresnel lenses and dish engine systems. It also provides an overview of the trends in the market and research that should be performed in order to make

251

SunShot Initiative: Collectors R&D for CSP Systems  

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

Collectors R&D for CSP Systems to Collectors R&D for CSP Systems to someone by E-mail Share SunShot Initiative: Collectors R&D for CSP Systems on Facebook Tweet about SunShot Initiative: Collectors R&D for CSP Systems on Twitter Bookmark SunShot Initiative: Collectors R&D for CSP Systems on Google Bookmark SunShot Initiative: Collectors R&D for CSP Systems on Delicious Rank SunShot Initiative: Collectors R&D for CSP Systems on Digg Find More places to share SunShot Initiative: Collectors R&D for CSP Systems on AddThis.com... Concentrating Solar Power Systems Components Collectors Receivers Power Block Thermal Storage Systems Analysis Competitive Awards Staff Photovoltaics Systems Integration Balance of Systems Collectors R&D for CSP Systems Collectors-whether for trough, tower (heliostat), linear Fresnel or dish

252

SunShot Initiative: Component R&D for CSP Systems  

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

Component R&D for CSP Systems Component R&D for CSP Systems Graphic showing five color blocks in a circular formation that represent the technical goals and cost targets for each component in the CSP system. Enlarge image The SunShot Initiative goal is to reduce the levelized cost of electricity generated by concentrating solar power (CSP) to $0.06 per kilowatt hour (kWh) or less, without any subsidy, by the year 2020. Concentrating solar power systems have different system configurations, such as trough, tower, linear Fresnel or dish, but they all share similar components. The SunShot CSP program funds research and development within the industry, national laboratories and universities to achieve the technical and economic targets for the following CSP component technologies:

253

SolarPaces International CSP Project Information | Open Energy Information  

Open Energy Info (EERE)

SolarPaces International CSP Project Information SolarPaces International CSP Project Information Jump to: navigation, search Tool Summary LAUNCH TOOL Name: SolarPaces International CSP Project Information Agency/Company /Organization: National Renewable Energy Laboratory Sector: Energy Focus Area: Renewable Energy, Solar Topics: Implementation, Market analysis, Background analysis Resource Type: Dataset Website: www.nrel.gov/csp/solarpaces/ References: SolarPaces International CSP Project Information[1] Summary "Working with member countries, SolarPACES-Solar Power and Chemical Energy Systems-has compiled data on concentrating solar power (CSP) projects around the world that have plants that are either operational, under construction, or under development. CSP technologies include parabolic trough, linear Fresnel reflector, power tower, and dish/engine

254

SunShot Initiative: Dish Engine  

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

Dish Engine to someone by E-mail Dish Engine to someone by E-mail Share SunShot Initiative: Dish Engine on Facebook Tweet about SunShot Initiative: Dish Engine on Twitter Bookmark SunShot Initiative: Dish Engine on Google Bookmark SunShot Initiative: Dish Engine on Delicious Rank SunShot Initiative: Dish Engine on Digg Find More places to share SunShot Initiative: Dish Engine on AddThis.com... Concentrating Solar Power Systems Parabolic Trough Linear Fresnel Power Tower Dish Engine Components Competitive Awards Staff Photovoltaics Systems Integration Balance of Systems Dish Engine DOE funds solar research and development (R&D) in dish/engine systems as one of four concentrating solar power (CSP) technologies aiming to meet the goals of the SunShot Initiative. CSP dish engines, which provide high solar

255

SunShot Initiative: CSP Systems Research and Development  

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

CSP Systems Research and CSP Systems Research and Development to someone by E-mail Share SunShot Initiative: CSP Systems Research and Development on Facebook Tweet about SunShot Initiative: CSP Systems Research and Development on Twitter Bookmark SunShot Initiative: CSP Systems Research and Development on Google Bookmark SunShot Initiative: CSP Systems Research and Development on Delicious Rank SunShot Initiative: CSP Systems Research and Development on Digg Find More places to share SunShot Initiative: CSP Systems Research and Development on AddThis.com... Concentrating Solar Power Systems Parabolic Trough Linear Fresnel Power Tower Dish Engine Components Competitive Awards Staff Photovoltaics Systems Integration Balance of Systems CSP Systems Research and Development The SunShot Initiative concentrating solar power (CSP) program funds

256

A Systematic Comparison on Power Block Efficiencies for CSP Plants with Direct Steam Generation  

Science Journals Connector (OSTI)

Abstract The increase of the process temperature of concentrating solar power plants above the degradation temperature of thermal oil (400 °C) opens the way for increased power block efficiency and thus reduced cost of electricity production. Direct solar steam generation is one technical option to follow this path. The paper presents different power block designs for direct steam generation parabolic trough and linear Fresnel power plants. Based on a systematic modelling approach, results for efficiency gains are derived and compared against a reference case of an oil-based plant. The results show that different reheat configurations are feasible and that efficiency gains in the range from 4 to 6% can be expected based on todays or near future solar collector technology.

T. Hirsch; A. Khenissi

2014-01-01T23:59:59.000Z

257

Linear Collider Collaboration Tech Notes LCC-0104  

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

4 4 October 2002 Beamstrahlung Photon Load on the TESLA Extraction Septum Blade Andrei Seryi Stanford Linear Accelerator Center Stanford, CA 94309, USA Abstract: This note describes work performed in the framework of the International Linear Collider Technical Review Committee [1] to estimate the power load on the TESLA extraction septum blade due to beamstrahlung photons. It is shown, that under realistic conditions the photon load can be several orders of magnitude higher than what was estimated in the TESLA TDR [2] for the ideal Gaussian beams, potentially representing a serious limitation of the current design. Beamstrahlung Photon Load on the TESLA Extraction Septum Blade ANDREI SERYI STANFORD LINEAR

258

LED Linear Lamps and Troffer Lighting  

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

The CALiPER program performed a series of investigations on linear LED lamps. Each report in the series covers the performance of up to 31 linear LED lamps, which were purchased in late 2012 or 2013. The first report focuses on bare lamp performance of LED T8 replacement lamps and subsequent reports examine performance in various troffers, as well as cost-effectiveness. There is also a concise guidance document that describes the findings of the Series 21 studies and provides practical advice to manufacturers, specifiers, and consumers (Report 21.4: Summary of Linear (T8) LED Lamp Testing , 5 pages, June 2014).

259

Optically isolated signal coupler with linear response  

DOE Patents (OSTI)

An optocoupler for isolating electrical signals that translates an electrical input signal linearly to an electrical output signal. The optocoupler comprises a light emitter, a light receiver, and a light transmitting medium. The light emitter, preferably a blue, silicon carbide LED, is of the type that provides linear, electro-optical conversion of electrical signals within a narrow wavelength range. Correspondingly, the light receiver, which converts light signals to electrical signals and is preferably a cadmium sulfide photoconductor, is linearly responsive to light signals within substantially the same wavelength range as the blue LED.

Kronberg, James W. (Aiken, SC)

1994-01-01T23:59:59.000Z

260

Linear chain tensioning of moored production vessels  

SciTech Connect

Part 1 of this two-part series discussed the worldwide floating production vessel (FPV) market and evolution of the linear puller concept. The three principal types of chain jack systems - hollow ram, single and twin cylinders - were introduced. And advantages of this relatively new form of passive mooring were outlined. This concluding article covers applications of linear chain pullers on various vessels, including use on an example 35,000-t North Sea semi-submersible. Chain wear and how linear pullers avoid wear associated with windlass-type systems are discussed, along with the optimization possible through use of a swiveling chain fair-lead latch (SCFL).

Peters, B. (Bardex Corp., London (United Kingdom))

1993-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "trough linear fresnel" 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

Photon emission within the linear sigma model  

E-Print Network (OSTI)

Soft-photon emission rates are calculated within the linear sigma model. The investigation is aimed at answering the question to which extent the emissivities map out the phase structure of this particular effective model of strongly interacting matter.

F. Wunderlich; B. Kampfer

2014-12-22T23:59:59.000Z

262

18.06 Linear Algebra, Spring 2005  

E-Print Network (OSTI)

This is a basic subject on matrix theory and linear algebra. Emphasis is given to topics that will be useful in other disciplines, including systems of equations, vector spaces, determinants, eigenvalues, similarity, and ...

Strang, Gilbert

263

Linear Thermodynamics of Rodlike DNA Filtration  

E-Print Network (OSTI)

Linear thermodynamics transportation theory is employed to study filtration of rodlike DNA molecules. Using the repeated nanoarray consisting of alternate deep and shallow regions, it is demonstrated that the complex ...

Li, Zirui

264

Kinematic moment invariants for linear Hamiltonian systems  

Science Journals Connector (OSTI)

Quadratic moments of a particle distribution being transported through a linear Hamiltonian system are considered. A complete set of kinematic invariants made out of these moments are constructed leading to the discovery of new invariants.

Filippo Neri and Govindan Rangarajan

1990-03-05T23:59:59.000Z

265

Non-linear Seismic Soil Structure Interaction Method for Developing...  

Office of Environmental Management (EM)

Contact - Sliding and Separation Non-linear springs * Material ElasticPlastic * Non-linear soil behavior * Non-linear behavior between soil and structure (i.e. the...

266

Experimental Analysis of Two Measurement Techniques to Characterize Photodiode Linearity  

E-Print Network (OSTI)

Experimental Analysis of Two Measurement Techniques to Characterize Photodiode Linearity Anand anand@ece.ucsb.edu Abstract--As photodiodes become more linear, accurately characterizing, the limitations of the measurement system in determining the distortion of highly linear photodiodes. I

Coldren, Larry A.

267

Linear Collider Collaboration Tech Notes LCC-0100  

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

100 100 August 2002 Systematic Ground Motion and Macroalignment for Linear Colliders Rainer Pitthan Stanford Linear Accelerator Center Stanford University Stanford, CA 94309, USA Abstract: Future colliders with their µm-range operational tolerances still need to be classically aligned to the 50 - 100 µm range, and kept there, over the km range. This requirement will not be a show-stopper, but not be trivial either. 50 µm movements over a betatron wavelength is a the range where systematic long term motions can prevent efficient operation. Systematic Ground Motion and Macro-Alignment for Linear Colliders Complete talk at: http://www-project.slac.stanford.edu/lc/wkshp/snowmass2001/t6/info/pitthan july

268

On frequency dependence of pulsar linear polarization  

E-Print Network (OSTI)

Frequency dependence of pulsar linear polarization is investigated by simulations of emission and propagation processes. Linearly polarized waves are generated through curvature radiation by relativistic particles streaming along curved magnetic field lines, which have ordinary mode (O-mode) and extra-ordinary mode (X-mode) components. As emitted waves propagate outwards, two mode components are separated due to re- fraction of the O mode, and their polarization states are also modified. According to the radius to frequency mapping, low frequency emission is generated from higher magnetosphere, where significant rotation effect leads the X and O modes to be sepa- rated. Hence, the low frequency radiation has a large fraction of linear polarization. As the frequency increases, emission is generated from lower heights, where the rotation effect becomes weaker and the distribution regions of two modes are more overlapped. Hence, more significant depolarization appears for emission at higher frequencies. In addit...

Wang, P F; Han, J L

2015-01-01T23:59:59.000Z

269

Dual-range linearized transimpedance amplifier system  

DOE Patents (OSTI)

A transimpedance amplifier system is disclosed which simultaneously generates a low-gain output signal and a high-gain output signal from an input current signal using a single transimpedance amplifier having two different feedback loops with different amplification factors to generate two different output voltage signals. One of the feedback loops includes a resistor, and the other feedback loop includes another resistor in series with one or more diodes. The transimpedance amplifier system includes a signal linearizer to linearize one or both of the low- and high-gain output signals by scaling and adding the two output voltage signals from the transimpedance amplifier. The signal linearizer can be formed either as an analog device using one or two summing amplifiers, or alternately can be formed as a digital device using two analog-to-digital converters and a digital signal processor (e.g. a microprocessor or a computer).

Wessendorf, Kurt O. (Albuquerque, NM)

2010-11-02T23:59:59.000Z

270

Solving Linear Systems of Differential Equations By MATLAB  

E-Print Network (OSTI)

Solving Linear Systems of Differential Equations By MATLAB. Consider X'=AX where A is nxn. Suppose there are n linearly independent eigenvectors for A,.

271

Safe bounds in linear and mixed-integer programming  

E-Print Network (OSTI)

Abstract: Current mixed-integer linear programming solvers are based on linear programming routines that use floating point arithmetic. Occasionally, this leads ...

Arnold Neumaier

272

Linear and angular retroreflecting interferometric alignment target  

DOE Patents (OSTI)

The present invention provides a method and apparatus for measuring both the linear displacement and angular displacement of an object using a linear interferometer system and an optical target comprising a lens, a reflective surface and a retroreflector. The lens, reflecting surface and retroreflector are specifically aligned and fixed in optical connection with one another, creating a single optical target which moves as a unit that provides multi-axis displacement information for the object with which it is associated. This displacement information is useful in many applications including machine tool control systems and laser tracker systems, among others.

Maxey, L. Curtis (Powell, TN)

2001-01-01T23:59:59.000Z

273

A linear logical view of linear type isomorphisms Vincent Balat and Roberto Di Cosmo  

E-Print Network (OSTI)

A linear logical view of linear type isomorphisms Vincent Balat and Roberto Di Cosmo LIENS ' Ecole lambda calculus) have recently been investigated due to their practical interest in library search, where they provide a means to search functions by type (see [18, 19, 17, 20, 9, 8, 10]) and to match

Balat, Vincent - Laboratoire Preuves, Programmes et Systèmes, Université Paris 7

274

Boundary observers for linear and quasi-linear hyperbolic systems with application to flow control  

Science Journals Connector (OSTI)

In this paper we consider the problem of boundary observer design for one-dimensional first order linear and quasi-linear strict hyperbolic systems with n rightward convecting transport PDEs. By means of Lyapunov based techniques, we derive some sufficient ... Keywords: Boundary observers, Hyperbolic systems, Infinite dimensional observer

Felipe Castillo; Emmanuel Witrant; Christophe Prieur; Luc Dugard

2013-11-01T23:59:59.000Z

275

Non-Linear Seismic Soil Structure Interaction (SSI) Method for Developing Non-Linear Seismic SSI Analysis Techniques  

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

Non-Linear Seismic Soil Structure Interaction (SSI) Method for Developing Non-Linear Seismic SSI Analysis Techniques Justin Coleman, P.E. October 25th, 2011

276

Original Paper Fully interconnected, linear control  

E-Print Network (OSTI)

Original Paper Fully interconnected, linear control for limit cycle walking Joseph H Solomon1 and simple control methodologies for these models (Collins & Ruina, 2005; Hobbelen & Wisse, 2008a, 2008b. Corresponding author: Joseph H. Solomon, Northwestern University, Department of Mechanical Engineering, 2145

Hartmann, Mitra J. Z.

277

Automatic tuning for linearly tunable filter  

E-Print Network (OSTI)

A new tuning scheme for linearly tunable high-Q filters is proposed. The tuning method is based on using the phase information for both frequency and Q factor tuning. There is no need to find out the relationship between a filter's passband...

Huang, Sung-Ling

2004-09-30T23:59:59.000Z

278

Linearity -statistics 1.1B training  

E-Print Network (OSTI)

Linearity - statistics IPAT 1.1B training 300M training D0 resolution is evaluated using 100k single muon events (same events in all 3 plots). Red is the default 11L FTK bank trained using 300M muons on narrow beam of muons (central eta, fixed phi, high fixed pT). Using two types of training: default FTK

279

Linear efficient antialiased displacement and reflectance mapping  

Science Journals Connector (OSTI)

We present Linear Efficient Antialiased Displacement and Reflectance (LEADR) mapping, a reflectance filtering technique for displacement mapped surfaces. Similarly to LEAN mapping, it employs two mipmapped texture maps, which store the first two moments ... Keywords: BRDF, GPU, LEAN mapping, filtering, microfacet

Jonathan Dupuy; Eric Heitz; Jean-Claude Iehl; Pierre Poulin; Fabrice Neyret; Victor Ostromoukhov

2013-11-01T23:59:59.000Z

280

Free energy of an anharmonic linear lattice  

Science Journals Connector (OSTI)

The anharmonic contributions of O(?4) to the free energy of a monatomic linear chain have been calculated both at high and zero temperatures. The contributions to the zero-point energy are also estimated using the Ludwig approximation. It turns out that the Ludwig approximation is not good for estimating the complicated anharmonic contributions to the zero-point energy.

M. R. Monga and V. K. Jindal

1975-02-15T23:59:59.000Z

Note: This page contains sample records for the topic "trough linear fresnel" 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

Free Energy of the Antiferromagnetic Linear Chain  

Science Journals Connector (OSTI)

Rigorous upper and lower bounds for the free energy of the antiferromagnetic Heisenberg linear chain are obtained from general convexity properties of the free energy. The lower bound is here derived; the upper bound has been obtained previously by Bulaevskii. Both are compared with the calculations of Bonner and Fisher for finite chains.

Robert B. Griffiths

1964-11-02T23:59:59.000Z

282

Pretopology semantics for bimodal intuitionistic linear logic  

Science Journals Connector (OSTI)

......is sho wn b y structural induction? F or parts ? and ? pro ceed b y induc? tion on pro ofs? P art ? follo ws from ???? Ha...s ??? mo deling of mo dalities in linear logic one can pro ceed as these authors do to a phase?space seman tics mo deling t......

C Hartonas

1997-01-01T23:59:59.000Z

283

Primes Solutions Of Linear Diophantine Equations  

E-Print Network (OSTI)

Let k => 1, m => 1 be small fixed integers, gcd(k, m) = 1. This note develops some techniques for proving the existence of infinitely many primes solutions x = p, and y = q of the linear Diophantine equation y = mx + k.

N. A. Carella

2014-04-03T23:59:59.000Z

284

General moment invariants for linear Hamiltonian systems  

Science Journals Connector (OSTI)

This paper studies the behavior of the moments of a particle distribution as it is transported through a Hamiltonian system. Functions of moments that remain invariant for an arbitrary linear Hamiltonian system are constructed. These functions remain approximately invariant for Hamiltonian systems that are not strongly nonlinear. Consequently, they can be used to characterize the degree of nonlinearity of the system.

Alex J. Dragt; Filippo Neri; Govindan Rangarajan

1992-02-15T23:59:59.000Z

285

On Finite Index Subgroups of Linear Groups  

Science Journals Connector (OSTI)

......the pro-finite completion of F, is infinite...then every finite index subgroup is of p-power...subgroup T' of finite index in F, a finitely...the pro-finite completion of the ring A...denotes the m-adic completion of A with respect...ON FINITE INDEX SUBGROUPS OF LINEAR......

Alexander Lubotzky

1987-07-01T23:59:59.000Z

286

Non-linear dark energy clustering  

SciTech Connect

We consider a dark energy fluid with arbitrary sound speed and equation of state and discuss the effect of its clustering on the cold dark matter distribution at the non-linear level. We write the continuity, Euler and Poisson equations for the system in the Newtonian approximation. Then, using the time renormalization group method to resum perturbative corrections at all orders, we compute the total clustering power spectrum and matter power spectrum. At the linear level, a sound speed of dark energy different from that of light modifies the power spectrum on observationally interesting scales, such as those relevant for baryonic acoustic oscillations. We show that the effect of varying the sound speed of dark energy on the non-linear corrections to the matter power spectrum is below the per cent level, and therefore these corrections can be well modelled by their counterpart in cosmological scenarios with smooth dark energy. We also show that the non-linear effects on the matter growth index can be as large as 10–15 per cent for small scales.

Anselmi, Stefano; Ballesteros, Guillermo [Dipartimento di Fisica ''G. Galilei'', Università degli Studi di Padova, via Marzolo 8, I-35131 Padua (Italy); Pietroni, Massimo, E-mail: anselmi@pd.infn.it, E-mail: ballesteros@pd.infn.it, E-mail: pietroni@pd.infn.it [INFN — Sezione di Padova, via Marzolo 8, I-35131 Padua (Italy)

2011-11-01T23:59:59.000Z

287

Towards a Future Linear Collider and The Linear Collider Studies at CERN  

ScienceCinema (OSTI)

During the week 18-22 October, more than 400 physicists will meet at CERN and in the CICG (International Conference Centre Geneva) to review the global progress towards a future linear collider. The 2010 International Workshop on Linear Colliders will study the physics, detectors and accelerator complex of a linear collider covering both the CLIC and ILC options. Among the topics presented and discussed will be the progress towards the CLIC Conceptual Design Report in 2011, the ILC Technical Design Report in 2012, physics and detector studies linked to these reports, and an increasing numbers of common working group activities. The seminar will give an overview of these topics and also CERN?s linear collider studies, focusing on current activities and initial plans for the period 2011-16. n.b: The Council Chamber is also reserved for this colloquium with a live transmission from the Main Auditorium.

None

2011-10-06T23:59:59.000Z

288

Enhanced dielectric-wall linear accelerator  

DOE Patents (OSTI)

A dielectric-wall linear accelerator is enhanced by a high-voltage, fast e-time switch that includes a pair of electrodes between which are laminated alternating layers of isolated conductors and insulators. A high voltage is placed between the electrodes sufficient to stress the voltage breakdown of the insulator on command. A light trigger, such as a laser, is focused along at least one line along the edge surface of the laminated alternating layers of isolated conductors and insulators extending between the electrodes. The laser is energized to initiate a surface breakdown by a fluence of photons, thus causing the electrical switch to close very promptly. Such insulators and lasers are incorporated in a dielectric wall linear accelerator with Blumlein modules, and phasing is controlled by adjusting the length of fiber optic cables that carry the laser light to the insulator surface. 6 figs.

Sampayan, S.E.; Caporaso, G.J.; Kirbie, H.C.

1998-09-22T23:59:59.000Z

289

Linear plasma-based tritium production facility  

SciTech Connect

The concept presented here is an adaptation of a recently completed conceptual design of a compact high-fluence D-T neutron source for accelerated end-of-life testing of fusion reactor materials. Although this preliminary assessment serves to illustrate the main features of a linear plasma-based tritium breeder, it is not necessarily an optimized design. We believe that proper design choices for the breeder application will certainly reduce costs, perhaps as much as a factor of two. We also point out that Q (the ratio of fusion power produced to power input to the plasma) increases with system length and that the cost per kg of tritium decreases for longer systems with higher output. In earlier studies of linear two-component plasma systems, Q values as high as three were predicted. At this level of performance and with energy recovery, operating power requirements of the breeder could approach zero. 5 refs., 1 fig., 1 tab.

Coensgen, F.H.; Futch, A.H.; Molvik, A.W.

1989-02-15T23:59:59.000Z

290

A robustness application for linear estimation  

E-Print Network (OSTI)

, recursive algorithm for yielding estimates of the state of a linear dynamic system (see, for example, the excellent tutorial [1]). Many other applications of this estimation scheme exist in the areas of signal processing, power systems, telecommunications... on robustness causes the coefficient which maximizes J to approach the coefficient which produces maximum robustness. 37 REFERENCES [1] I. B. Rhodes, "A Tutorial Introduction to Estimation and Filtering, "IEEE Trans. on Automatic Control, vol. AC-16, pp...

Kitzman, Kenneth Victor

1990-01-01T23:59:59.000Z

291

Positive energy quantization of linear dynamics  

E-Print Network (OSTI)

The abstract mathematical structure behind the positive energy quantization of linear classical systems is described. It is separated into 3 stages: the description of a classical system, the algebraic quantization and the Hilbert space quantization. 4 kinds of systems are distinguished: neutral bosonic, neutral bosonic, charged bosonic and charged fermionic. The formalism that is described follows closely the usual constructions employed in quantum physics to introduce non-interacting quantum fields.

Derezinski, Jan

2009-01-01T23:59:59.000Z

292

The Next Linear Collider: NLC2001  

SciTech Connect

Recent studies in elementary particle physics have made the need for an e{sup +}e{sup -} linear collider able to reach energies of 500 GeV and above with high luminosity more compelling than ever [1]. Observations and measurements completed in the last five years at the SLC (SLAC), LEP (CERN), and the Tevatron (FNAL) can be explained only by the existence of at least one particle or interaction that has not yet been directly observed in experiment. The Higgs boson of the Standard Model could be that particle. The data point strongly to a mass for the Higgs boson that is just beyond the reach of existing colliders. This brings great urgency and excitement to the potential for discovery at the upgraded Tevatron early in this decade, and almost assures that later experiments at the LHC will find new physics. But the next generation of experiments to be mounted by the world-wide particle physics community must not only find this new physics, they must find out what it is. These experiments must also define the next important threshold in energy. The need is to understand physics at the TeV energy scale as well as the physics at the 100-GeV energy scale is now understood. This will require both the LHC and a companion linear electron-positron collider. A first Zeroth-Order Design Report (ZDR) [2] for a second-generation electron-positron linear collider, the Next Linear Collider (NLC), was published five years ago. The NLC design is based on a high-frequency room-temperature rf accelerator. Its goal is exploration of elementary particle physics at the TeV center-of-mass energy, while learning how to design and build colliders at still higher energies. Many advances in accelerator technologies and improvements in the design of the NLC have been made since 1996. This Report is a brief update of the ZDR.

D. Burke et al.

2002-01-14T23:59:59.000Z

293

Linear feature selection for multipopulation classification  

E-Print Network (OSTI)

) December 1974 ABSTRACT Linear Feature Selection for Multipopulation Classification. (December 1974) Kathryn A. Havens, B. S. , Lamar University Chairman of Advisory Committee: Dr. L. F. Guseman, Jr. A classification procedure for n...-dimensional normally distributed observation vectors which belong to one of three populations is de- scribed. In particular, a computational procedure is presented for finding a lxn vector B which minimizes the probability of misclassification with respect...

Havens, Kathryn Anne

2012-06-07T23:59:59.000Z

294

Subsonic Free Surface Waves in Linear Elasticity  

E-Print Network (OSTI)

For general anisotropic linear elastic solids with smooth boundaries, Rayleigh-type surface waves are studied. Using spectral factorizations of matrix polynomials, a self-contained exposition of the case of a homogeneous half-space is given first. The main result is about inhomogeneous anisotropic bodies with curved surfaces. The existence of subsonic free surface waves is shown by giving ray series asymptotic expansions, including formulas for the transport equation.

Sönke Hansen

2014-05-09T23:59:59.000Z

295

Linear Collider Collaboration Tech Notes LCC-0108  

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

8 8 TESLA 2002-10 CBP Tech Note-268 November 2002 Comparison of Emittance Tuning Simulations in the NLC and TESLA Damping Rings Andrej Wolski Lawrence Berkeley National Laboratory University of California Berkeley, CA Winfried Decking Deutsches Elektron Synchrotron (DESY) Hamburg, Germany Abstract: Vertical emittance is a critical issue for future linear collider damping rings. Both NLC and TESLA specify vertical emittance of the order of a few picometers, below values currently achieved in any storage ring. Simulations show that algorithms based on correcting the closed orbit and the vertical dispersion can be effective in reducing the vertical emittance to the required levels, in the presence of a limited subset of

296

Linear Collider Collaboration Tech Notes LCC-0110  

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

0 0 December 2002 Post-Target Beamline Design for Proposed FFTB Experiment with Polarized Positrons Y. K. Batygin and J. C. Sheppard Stanford Linear Accelerator Center Stanford University Menlo Park, CA 04025 Abstract: The beamline after positron production target for the proposed experiment E-166 is discussed. The beamline includes bending magnets and solenoid to deliver polarized positron beam from the target to polarimeter. Results of simulation indicate that transmission efficiency of 1...3 % with beam polarization of 60...80 % can be obtained if beam energy resolution is required while the transmission of 40...77 % and polarization of 40% can be obtained without beam energy resolution. 13 December 2002

297

Linear amplifier model for optomechanical systems  

Science Journals Connector (OSTI)

We model optomechanical systems as linear optical amplifiers. This provides a unified treatment of diverse optomechanical phenomena. We emphasize, in particular, the relationship between ponderomotive squeezing and optomechanically induced transparency, two foci of current research. We characterize the amplifier response to quantum and applied classical fluctuations, both optical and mechanical. Further, we apply these results to establish quantum limits on external force sensing both on and off cavity resonance. We find that the maximum sensitivity attained on resonance constitutes an absolute upper limit, not surpassed when detuning off cavity resonance. The theory is extended to a two-sided cavity with losses and limited detection efficiency.

Thierry Botter; Daniel W. C. Brooks; Nathan Brahms; Sydney Schreppler; Dan M. Stamper-Kurn

2012-01-09T23:59:59.000Z

298

Broader Impacts of the International Linear Collider  

SciTech Connect

Large-scale scientific endeavors such as the International Linear Collider Project can have a lasting impact on education and outreach to our society. The ILC will provide a discovery platform for frontier physical science and it will also provide a discovery platform for broader impacts and social science. The importance of Broader Impacts of Science in general and the ILC in particular are described. Additionally, a synopsis of education and outreach activities carried out as an integral part of the Snowmass ILC Workshop is provided.

Bardeen, M.; Ruchti, R.

2005-08-01T23:59:59.000Z

299

Linear Collider Collaboration Tech Notes LCC-0099  

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

099 099 August 2002 Space Charge Dynamics of Bright Electron Beams Alexander W. Chao, Rainer Pitthan, Toshiki Tajima, Dian Yeremian Stanford Linear Accelerator Center Stanford University Abstract: The longitudinal dynamics and its coupling with the transverse dynamics of bunched beams with strong space charge are analyzed. We introduce a self-consistent Vlasov description for the longitudinal phase space similar to the familiar description for the transverse phase space using a Kapchinskij-Vladimirskij (K-V) distribution [1]. A longitudinal beam envelope equation is derived. An exact solution is then obtained when coupling to the transverse dynamics is ignored. This longitudinal envelope equation is coupled to the transverse envelope

300

Rotary-linear axes for high speed machining  

E-Print Network (OSTI)

This thesis presents the design, analysis, fabrication, and control of a rotary-linear axis; this axis is a key subsystem for high speed, 5-axis machine tools intended for fabricating centimeter-scale parts. The rotary-linear ...

Liebman, Michael Kevin, 1974-

2001-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trough linear fresnel" 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

Competition Between Linear and Cyclic Structures in Monochromium...  

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

Between Linear and Cyclic Structures in Monochromium Carbide Clusters CrCn- and CrCn (n2-8): A Photoelectron Competition Between Linear and Cyclic Structures in Monochromium...

302

A Bayesian Approach to Empirical Local Linearization For Robotics   

E-Print Network (OSTI)

Local linearizations are ubiquitous in the control of robotic systems. Analytical methods, if available, can be used to obtain the linearization, but in complex robotics systems where the dynamics and kinematics are ...

Ting, Jo-Anne; D'Souza, Aaron; Vijayakumar, Sethu; Schaal, Stefan

2008-01-01T23:59:59.000Z

303

RELATIVE ONE-WEIGHT LINEAR CODES JAY A. WOOD  

E-Print Network (OSTI)

RELATIVE ONE-WEIGHT LINEAR CODES JAY A. WOOD In memory of Professor F. E. P. Hirzebruch, 17 October University. 1 #12;2 JAY A. WOOD G thus defines a linear functional (a "coordinate functional") on the k

Wood, Jay

304

Experimental analysis of two measurement techniques to characterize photodiode linearity  

E-Print Network (OSTI)

As photodiodes become more linear, accurately characterizing their linearity becomes very challenging. We compare the IMD3 results from a standard two tone measurement to those from a more complex three tone measurement ...

Klamkin, Jonathan

305

Duality in spaces of finite linear combinations of atoms  

E-Print Network (OSTI)

Duality in spaces of finite linear combinations of atoms Fulvio Ricci and Joan Verdera Abstract In this note we describe the dual and the completion of the space of finite linear combinations of (p, )-atoms, )-atoms, 0

Ricci, Fulvio

306

A difference based approach to the semiparametric partial linear model  

E-Print Network (OSTI)

A commonly used semiparametric partial linear model is considered. We propose analyzing this model using a difference based approach. The procedure estimates the linear component based on the differences of the observations ...

Wang, Lie

2011-01-01T23:59:59.000Z

307

Astrophysical Gyrokinetics: Basic Equations and Linear Theory  

E-Print Network (OSTI)

Magnetohydrodynamic (MHD) turbulence is encountered in a wide variety of astrophysical plasmas, including accretion disks, the solar wind, and the interstellar and intracluster medium. On small scales, this turbulence is often expected to consist of highly anisotropic fluctuations with frequencies small compared to the ion cyclotron frequency. For a number of applications, the small scales are also collisionless, so a kinetic treatment of the turbulence is necessary. We show that this anisotropic turbulence is well described by a low frequency expansion of the kinetic theory called gyrokinetics. This paper is the first in a series to examine turbulent astrophysical plasmas in the gyrokinetic limit. We derive and explain the nonlinear gyrokinetic equations and explore the linear properties of gyrokinetics as a prelude to nonlinear simulations. The linear dispersion relation for gyrokinetics is obtained and its solutions are compared to those of hot-plasma kinetic theory. These results are used to validate the performance of the gyrokinetic simulation code {\\tt GS2} in the parameter regimes relevant for astrophysical plasmas. New results on global energy conservation in gyrokinetics are also derived. We briefly outline several of the problems to be addressed by future nonlinear simulations, including particle heating by turbulence in hot accretion flows and in the solar wind, the magnetic and electric field power spectra in the solar wind, and the origin of small-scale density fluctuations in the interstellar medium.

Gregory G. Howes; Steven C. Cowley; William Dorland; Gregory W. Hammett; Eliot Quataert; Alexander A. Schekochihin

2005-11-30T23:59:59.000Z

308

Linear wave propagation in relativistic magnetohydrodynamics  

Science Journals Connector (OSTI)

The properties of linear Alfvén slow and fast magnetoacoustic waves for uniform plasmas in relativistic magnetohydrodynamics(MHD) are discussed augmenting the well-known expressions for their phase speeds with knowledge on the group speed. A 3 + 1 formalism is purposely adopted to make direct comparison with the Newtonian MHD limits easier and to stress the graphical representation of their anisotropic linear wave properties using the phase and group speed diagrams. By drawing these for both the fluid rest frame and for a laboratory Lorentzian frame which sees the plasma move with a three-velocity having an arbitrary orientation with respect to the magnetic field a graphical view of the relativistic aberrationeffects is obtained for all three MHD wave families. Moreover it is confirmed that the classical Huygens construction relates the phase and group speed diagram in the usual way even for the lab frame viewpoint. Since the group speed diagrams correspond to exact solutions for initial conditions corresponding to a localized point perturbation their formulae and geometrical construction can serve to benchmark current high-resolution algorithms for numerical relativistic MHD.

R. Keppens; Z. Meliani

2008-01-01T23:59:59.000Z

309

Linear wave propagation in relativistic magnetohydrodynamics  

E-Print Network (OSTI)

The properties of linear Alfv\\'en, slow, and fast magnetoacoustic waves for uniform plasmas in relativistic magnetohydrodynamics (MHD) are discussed, augmenting the well-known expressions for their phase speeds with knowledge on the group speed. A 3+1 formalism is purposely adopted to make direct comparison with the Newtonian MHD limits easier and to stress the graphical representation of their anisotropic linear wave properties using the phase and group speed diagrams. By drawing these for both the fluid rest frame and for a laboratory Lorentzian frame which sees the plasma move with a three-velocity having an arbitrary orientation with respect to the magnetic field, a graphical view of the relativistic aberration effects is obtained for all three MHD wave families. Moreover, it is confirmed that the classical Huygens construction relates the phase and group speed diagram in the usual way, even for the lab frame viewpoint. Since the group speed diagrams correspond to exact solutions for initial conditions co...

Keppens, R

2008-01-01T23:59:59.000Z

310

Linear wave propagation in relativistic magnetohydrodynamics  

SciTech Connect

The properties of linear Alfven, slow, and fast magnetoacoustic waves for uniform plasmas in relativistic magnetohydrodynamics (MHD) are discussed, augmenting the well-known expressions for their phase speeds with knowledge on the group speed. A 3+1 formalism is purposely adopted to make direct comparison with the Newtonian MHD limits easier and to stress the graphical representation of their anisotropic linear wave properties using the phase and group speed diagrams. By drawing these for both the fluid rest frame and for a laboratory Lorentzian frame which sees the plasma move with a three-velocity having an arbitrary orientation with respect to the magnetic field, a graphical view of the relativistic aberration effects is obtained for all three MHD wave families. Moreover, it is confirmed that the classical Huygens construction relates the phase and group speed diagram in the usual way, even for the lab frame viewpoint. Since the group speed diagrams correspond to exact solutions for initial conditions corresponding to a localized point perturbation, their formulae and geometrical construction can serve to benchmark current high-resolution algorithms for numerical relativistic MHD.

Keppens, R. [Centre for Plasma-Astrophysics, K.U. Leuven, Celestijnenlaan 200B, 3001 Heverlee (Belgium); Leuven Mathematical Modeling and Computational Science Centre, K.U. Leuven (Belgium); FOM-Institute for Plasma Physics, P.O. Box 1207, 3430 BE Nieuwegein (Netherlands) and Astronomical Institute, Utrecht University (Netherlands); Meliani, Z. [Centre for Plasma-Astrophysics, K.U. Leuven, Celestijnenlaan 200B, 3001 Heverlee (Belgium)

2008-10-15T23:59:59.000Z

311

Linear wave propagation in relativistic magnetohydrodynamics  

E-Print Network (OSTI)

The properties of linear Alfv\\'en, slow, and fast magnetoacoustic waves for uniform plasmas in relativistic magnetohydrodynamics (MHD) are discussed, augmenting the well-known expressions for their phase speeds with knowledge on the group speed. A 3+1 formalism is purposely adopted to make direct comparison with the Newtonian MHD limits easier and to stress the graphical representation of their anisotropic linear wave properties using the phase and group speed diagrams. By drawing these for both the fluid rest frame and for a laboratory Lorentzian frame which sees the plasma move with a three-velocity having an arbitrary orientation with respect to the magnetic field, a graphical view of the relativistic aberration effects is obtained for all three MHD wave families. Moreover, it is confirmed that the classical Huygens construction relates the phase and group speed diagram in the usual way, even for the lab frame viewpoint. Since the group speed diagrams correspond to exact solutions for initial conditions corresponding to a localized point perturbation, their formulae and geometrical construction can serve to benchmark current high-resolution algorithms for numerical relativistic MHD.

R. Keppens; Z. Meliani

2008-10-14T23:59:59.000Z

312

Quantization of rotating linear dilaton black holes  

E-Print Network (OSTI)

In this paper, we firstly prove that the adiabatic invariant quantity, which is commonly used in the literature for quantizing the rotating black holes (BHs) is fallacious. We then show how its corrected form should be. The main purpose of this paper is to study the quantization of 4-dimensional rotating linear dilaton black hole (RLDBH) spacetime describing with an action, which emerges in the Einstein-Maxwell-Dilaton-Axion (EMDA) theory. The RLDBH spacetime has a non-asymptotically flat (NAF) geometry. They reduces to the linear dilaton black hole (LDBH) metric when vanishing its rotation parameter $a$. While studying its scalar perturbations, it is shown that the Schr\\"odinger-like wave equation around the event horizon reduces to a confluent hypergeometric differential equation. Then the associated complex frequencies of the quasinormal modes (QNMs) are computed. By using those QNMs in the true definition of the rotational adiabatic invariant quantity, we obtain the quantum spectra of entropy/area for the RLDBH. It is found out that both spectra are discrete and equidistant. Besides, we reveal that the quantum spectra do not depend on $a$ in spite of the QNMs are modulated by it.

I. Sakalli

2014-06-19T23:59:59.000Z

313

Optimized groundwater containment using linear programming  

SciTech Connect

Groundwater extraction systems are typically installed to contain contaminant plumes. These systems are expensive to install and maintain. A traditional approach to designing such a wellfield is to use a series of trial-and-error simulations to test the effects of various well locations and pump rates. However, optimal locations and pump rates of extraction wells are difficult to determine when the objectives of the potential pumping scheme and the site hydrogeology are considered. This paper describes a case study of an application of linear programming theory to determine optimal well placement and pump rates. Calculations were conducted by using ModMan to link a calibrated MODFLOW flow model with LINDO, a linear programming package. Past activities at the site under study included disposal of contaminants in pits. Several groundwater plumes have been identified, and others may be present. The area of concern is bordered on three sides by a wetland, which receives a portion of its input water budget as groundwater discharge from the disposal area. The objective function of the optimization was to minimize the rate of groundwater extraction while preventing discharge to the marsh across a user-specified boundary. In this manner, the optimization routine selects well locations and pump rates to produce a groundwater divide along this boundary.

Quinn, J.J.; Johnson, R.L.; Durham, L.A.

1998-07-01T23:59:59.000Z

314

Text-Alternative Version: LED Replacements for Linear Fluorescent Lamps  

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

Below is the text-alternative version of the "LED Replacements for Linear Fluorescent Lamps" webcast, held June 20, 2011.

315

Linear Programming: Penn State Math 484 Lecture Notes  

E-Print Network (OSTI)

. Matrix Inverse 35 6. Solution of Linear Equations 37 7. Linear Combinations, Span, Linear Independence 39 Programs with Matlab 47 Chapter 4. Convex Sets, Functions and Cones and Polyhedral Theory 51 1. Convex Sets on the Graph of z. The level sets existing in R2 while the graph of z existing R3 . The level sets have been

Squicciarini, Anna Cinzia

316

Variational inferences for partially linear additive models with variable selection  

Science Journals Connector (OSTI)

This article develops a mean field variational Bayes approximation algorithm for posterior inferences of the recently proposed partially linear additive models with simultaneous and automatic variable selection and linear/nonlinear component identification ... Keywords: Bayesian inference, Mean field variational Bayes, Model selection, Partially linear additive model

Kaifeng Zhao, Heng Lian

2014-12-01T23:59:59.000Z

317

Correctness of linear logic proof structures is NL-complete  

Science Journals Connector (OSTI)

We provide new correctness criteria for all fragments (multiplicative, exponential, additive) of linear logic. We use these criteria for proving that deciding the correctness of a linear logic proof structure is NL-complete. Keywords: Complexity classes, Correctness criteria, Linear logic, Nondeterministic logspace

Paulin Jacobé De Naurois; Virgile Mogbil

2011-04-01T23:59:59.000Z

318

Quantization of gauge theories with linearly dependent generators  

Science Journals Connector (OSTI)

The quantization rules for gauge theories with open algebras are generalized to the case of linearly dependent generators. The given zero-eigenvalue eigenvectors of the generators may also be linearly dependent and possess zero-eigenvalue eigenvectors which may also be linearly dependent and so on. We give the solution for the general case of such a hierarchy.

I. A. Batalin and G. A. Vilkovisky

1983-11-15T23:59:59.000Z

319

Near-infrared spectroscopy of HD the barrier to linearity  

E-Print Network (OSTI)

Near-infrared spectroscopy of HD 3 above the barrier to linearity BY JENNIFER L. GOTTFRIED, transitions of HC 3 above the barrier to linearity have been observed. A highly sensitive near-infrared-adiabatic and radiative corrections is revealed. Keywords: HD 3 ; near-infrared spectroscopy; barrier to linearity 1

Oka, Takeshi

320

DAC Linearization Techniques for Sigma-delta Modulators  

E-Print Network (OSTI)

Digital-to-Analog Converters (DAC) form the feedback element in sigma-delta modulators. Any non-linearity in the DAC directly degrades the linearity of the modulator at low and medium frequencies. Hence, there is a need for designing highly linear...

Godbole, Akshay

2012-02-14T23:59:59.000Z

Note: This page contains sample records for the topic "trough linear fresnel" 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

Lineare Gleichungssysteme Nichtlineare Gleichungssysteme Interpolation Integration Eigenwerte Lineare Optimierung Unrestringierte Optimierung  

E-Print Network (OSTI)

. Dabei wurde gro�e Sorgfalt auf eine '' 1 zu 1``­ ¨ Ubernahme von der Tafel auf Papier geachtet. Trotzdem sind ¨ Ubertragungsfehler sowie Fehler an der Tafel nicht auszuschlie�en. (w) Mai 1996 #12; 1 LINEARE

Ott, Albrecht

322

Linear Collider Collaboration Tech Notes LCC-70  

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

70 70 August 2001 Design Studies of Positron Collection for the NLC Yuri K. Batygin, Ninod K. Bharadwaj, David C. Schultz ,John C. Sheppard Stanford Linear Accelerator Center Stanford, CA Abstract: The positron source for the NLC project utilizes a 6.2 GeV electron beam interacting in a high-Z positron production target. The electromagnetic shower in the target results in large energy deposition which can cause damage to the target. Optimization of the collection system is required to insure long-term operation of the target with needed high positron yield into the 6-dimensional acceptance of the subsequent pre-damping ring. Positron tracking through the accelerating system indicates a dilution of the initial positron phase space density. Results of simulations indicate that a

323

Linear Collider Collaboration Tech Notes LCC-0101  

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

1 1 August 2002 Collimator Wakefield Calculations for ILC-TRC Report Peter Tenenbaum Stanford Linear Accelerator Center Stanford University Stanford, CA 94309, USA Abstract: We summarize the formalism of collimator wakefields and their effect on beams that are near the center of the collimator gap, and apply the formalism to the TESLA, NLC, and CLIC collimation systems. Collimator Wakefield Calculations for ILC-TRC Report P. Tenenbaum LCC-Note-0101 20-Aug-2002 Abstract We summarize the formalism of collimator wakefields and their effect on beams which are near the center of the collimator gap, and apply the formalism to the TESLA, NLC, and CLIC collimation systems. 1 Introduction One of the beam dynamics effects which must be evaluated for the

324

Linear Collider Collaboration Tech Notes LCC-0109  

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

9 9 TESLA 2002-11 CBP Tech Note-269 November 2002 Alignment Stability Models for Damping Rings Andrej Wolski Lawrence Berkeley National Laboratory University of California Berkeley, CA Winfried Decking Deutsches Elektron Synchrotron (DESY) Hamburg, Germany Abstract: Linear collider damping rings are highly sensitive to magnet alignment. Emittance tuning simulations for current designs of damping rings for TESLA and NLC have given encouraging results, but depend on invasive measurements of dispersion. The frequency with which such measurements must be made is therefore an operational issue, and depends on the time stability of the alignment. In this note, we consider three effects that lead to misalignment and the need to retune the damping ring: (1)

325

Linear Collider Collaboration Tech Notes LCC-0063  

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

3 3 May 2001 Varying alpha/lambda in NLC Structures - BNS Damping and Emittance Growth G. Stupakov and Z. Li Stanford Linear Accelerator Center Stanford, CA Abstract: In this note we consider the effect of varying this iris opening in the NLC structures on the beam dynamics and the rf efficiency in the linac. Varying a/λ in NLC structures - BNS damping and emittance growth G. Stupakov and Z. Li SLAC, Stanford University, Stanford, CA 94309 In this note we consider the effect of the varying the iris opening a in the NLC structures on the beam dynamics and the RF efficiency in the linac. The most important consequence of the variation of the iris openings is the change of the longitudinal and transverse wakefields. Wake as a function of parameter a for the NLC structures has been previously calculated by K. Bane. Here we will use his

326

Terahertz-driven linear electron acceleration  

E-Print Network (OSTI)

The cost, size and availability of electron accelerators is dominated by the achievable accelerating gradient. Conventional high-brightness radio-frequency (RF) accelerating structures operate with 30-50 MeV/m gradients. Electron accelerators driven with optical or infrared sources have demonstrated accelerating gradients orders of magnitude above that achievable with conventional RF structures. However, laser-driven electron accelerators require intense sources and suffer from low bunch charge, sub-micron tolerances and sub-femtosecond timing requirements due to the short wavelength of operation. Here, we demonstrate the first linear acceleration of electrons with keV energy gain using optically-generated terahertz (THz) pulses. THz-driven accelerating structures enable high-gradient electron accelerators with simple accelerating structures, high repetition rates and significant charge per bunch. Increasing the operational frequency of accelerators into the THz band allows for greatly increased accelerating ...

Nanni, Emilio Alessandro; Ravi, Koustuban; Fallahi, Arya; Moriena, Gustavo; Miller, R J Dwayne; Kärtner, Franz X

2014-01-01T23:59:59.000Z

327

Governance of the International Linear Collider Project  

SciTech Connect

Governance models for the International Linear Collider Project are examined in the light of experience from similar international projects around the world. Recommendations for one path which could be followed to realize the ILC successfully are outlined. The International Linear Collider (ILC) is a unique endeavour in particle physics; fully international from the outset, it has no 'host laboratory' to provide infrastructure and support. The realization of this project therefore presents unique challenges, in scientific, technical and political arenas. This document outlines the main questions that need to be answered if the ILC is to become a reality. It describes the methodology used to harness the wisdom displayed and lessons learned from current and previous large international projects. From this basis, it suggests both general principles and outlines a specific model to realize the ILC. It recognizes that there is no unique model for such a laboratory and that there are often several solutions to a particular problem. Nevertheless it proposes concrete solutions that the authors believe are currently the best choices in order to stimulate discussion and catalyze proposals as to how to bring the ILC project to fruition. The ILC Laboratory would be set up by international treaty and be governed by a strong Council to whom a Director General and an associated Directorate would report. Council would empower the Director General to give strong management to the project. It would take its decisions in a timely manner, giving appropriate weight to the financial contributions of the member states. The ILC Laboratory would be set up for a fixed term, capable of extension by agreement of all the partners. The construction of the machine would be based on a Work Breakdown Structure and value engineering and would have a common cash fund sufficiently large to allow the management flexibility to optimize the project's construction. Appropriate contingency, clearly apportioned at both a national and global level, is essential if the project is to be realised. Finally, models for running costs and decommissioning at the conclusion of the ILC project are proposed. This document represents an interim report of the bodies and individuals studying these questions inside the structure set up and supervised by the International Committee for Future Accelerators (ICFA). It represents a request for comment to the international community in all relevant disciplines, scientific, technical and most importantly, political. Many areas require further study and some, in particular the site selection process, have not yet progressed sufficiently to be addressed in detail in this document. Discussion raised by this document will be vital in framing the final proposals due to be published in 2012 in the Technical Design Report being prepared by the Global Design Effort of the ILC.

Foster, B.; /Oxford U.; Barish, B.; /Caltech; Delahaye, J.P.; /CERN; Dosselli, U.; /INFN, Padua; Elsen, E.; /DESY; Harrison, M.; /Brookhaven; Mnich, J.; /DESY; Paterson, J.M.; /SLAC; Richard, F.; /Orsay, LAL; Stapnes, S.; /CERN; Suzuki, A.; /KEK, Tsukuba; Wormser, G.; /Orsay, LAL; Yamada, S.; /KEK, Tsukuba

2012-05-31T23:59:59.000Z

328

Linear Fixed-Field Multi-Pass Arcs for Recirculating Linear Accelerators  

SciTech Connect

Recirculating Linear Accelerators (RLA's) provide a compact and efficient way of accelerating particle beams to medium and high energies by reusing the same linac for multiple passes. In the conventional scheme, after each pass, the different energy beams coming out of the linac are separated and directed into appropriate arcs for recirculation, with each pass requiring a separate fixed-energy arc. In this paper we present a concept of an RLA return arc based on linear combined-function magnets, in which two and potentially more consecutive passes with very different energies are transported through the same string of magnets. By adjusting the dipole and quadrupole components of the constituting linear combined-function magnets, the arc is designed to be achromatic and to have zero initial and final reference orbit offsets for all transported beam energies. We demonstrate the concept by developing a design for a droplet-shaped return arc for a dog-bone RLA capable of transporting two beam passes with momenta different by a factor of two. We present the results of tracking simulations of the two passes and lay out the path to end-to-end design and simulation of a complete dog-bone RLA.

V.S. Morozov, S.A. Bogacz, Y.R. Roblin, K.B. Beard

2012-06-01T23:59:59.000Z

329

The Next Linear Collider Klystron Development Program  

E-Print Network (OSTI)

Klystrons capable of 75 MW output power at 11.4 GHz have been under development at SLAC for the last decade. The work has been part of the program to realize all the components necessary for the construction of the Next Linear Collider (NLC). The effort has produced a family of solenoid-focused 50 MW klystrons, which are currently powering a 0.5 GeV test accelerator at SLAC and several test stands, where high power components are evaluated and fundamental research is performed studying rf breakdown and dark current production. Continuing development has resulted in a Periodic Permanent Magnet (PPM) focused 50 MW klystron, tested at SLAC and subsequently contracted for manufacture by industry in England and Japan. A 75 MW version of that PPM klystron was built at SLAC and reached 75 MW, with 2.8 microsecond pulses. Based on this design, a prototype 75 MW klystron, designed for low-cost manufacture, is currently under development at SLAC, and will eventually be procured from industry in modest quantities for ad...

Jongewaard, E; Pearson, C; Phillips, R M; Sprehn, D; Vlieks, A E

2000-01-01T23:59:59.000Z

330

Theory of laser-amplifier linear gain  

Science Journals Connector (OSTI)

The theory of small-signal laser amplification is developed for homogeneously broadened systems in which the three main decay rates, for the collective atomic dipole moment, the population inversion, and the field in the laser cavity, have arbitrary relative magnitudes. The calculations extend previous work on class-A and -B lasers, where the dipole decay rate greatly exceeds the other two rates, to class-C lasers, where the dipole decay rate is comparable to the others. The free-running laser is assumed to excite a single longitudinal mode of the cavity, whose frequency generally differs from that of the coupled atomic transition. The linear gains of the laser are derived for input signals whose frequencies are close to that of the lasing mode or to one of its adjacent nonlasing longitudinal modes. Divergences in the gain that occur for these two arrangements are associated with the previously studied single-mode and multimode instabilities of the free-running laser, respectively.

J. Jahanpanah and R. Loudon

1997-09-01T23:59:59.000Z

331

Linearized Functional Minimization for Inverse Modeling  

SciTech Connect

Heterogeneous aquifers typically consist of multiple lithofacies, whose spatial arrangement significantly affects flow and transport. The estimation of these lithofacies is complicated by the scarcity of data and by the lack of a clear correlation between identifiable geologic indicators and attributes. We introduce a new inverse-modeling approach to estimate both the spatial extent of hydrofacies and their properties from sparse measurements of hydraulic conductivity and hydraulic head. Our approach is to minimize a functional defined on the vectors of values of hydraulic conductivity and hydraulic head fields defined on regular grids at a user-determined resolution. This functional is constructed to (i) enforce the relationship between conductivity and heads provided by the groundwater flow equation, (ii) penalize deviations of the reconstructed fields from measurements where they are available, and (iii) penalize reconstructed fields that are not piece-wise smooth. We develop an iterative solver for this functional that exploits a local linearization of the mapping from conductivity to head. This approach provides a computationally efficient algorithm that rapidly converges to a solution. A series of numerical experiments demonstrates the robustness of our approach.

Wohlberg, Brendt [Los Alamos National Laboratory; Tartakovsky, Daniel M. [University of California, San Diego; Dentz, Marco [Institute of Environmental Assessment and Water Research, Barcelona, Spain

2012-06-21T23:59:59.000Z

332

A thermoacoustic traveling wave linear amplifier  

Science Journals Connector (OSTI)

This paper describes an experiment to show linear amplification of traveling sound waves in a duct using a thermoacoustic regenerator. As noted by Ceperley [J. Acoust. Soc. Am. 66 1508–1513 (1979)] a Stirling engine?type regenerator should act as an acoustic gain medium for traveling waves in a duct. This principle is used in thermoacoustic traveling wave engines to transfer power from heat reservoirs to acoustic energy. However it is difficult to produce finite gain for pure traveling wave impedance since viscous losses in the channels of the regenerator overcome the gain and previous workers have only been able to show reduced loss in such a system. Optimizing the regenerator design with numerical modeling and using a greater temperature difference suggest that a traveling wave thermal amplifier can produce 2 dB of real gain over two octaves for traveling waves in air. Such a device would amplify a broadband acoustic signal without electrical transducers. Design of the amplifier and experimental results will be shown.

Robert A. Hiller

2000-01-01T23:59:59.000Z

333

Precision envelope detector and linear rectifier circuitry  

DOE Patents (OSTI)

Disclosed is a method and apparatus for the precise linear rectification and envelope detection of oscillatory signals. The signal is applied to a voltage-to-current converter which supplies current to a constant current sink. The connection between the converter and the sink is also applied through a diode and an output load resistor to a ground connection. The connection is also connected to ground through a second diode of opposite polarity from the diode in series with the load resistor. Very small amplitude voltage signals applied to the converter will cause a small change in the output current of the converter, and the difference between the output current and the constant current sink will be applied either directly to ground through the single diode, or across the output load resistor, dependent upon the polarity. Disclosed also is a full-wave rectifier utilizing constant current sinks and voltage-to-current converters. Additionally, disclosed is a combination of the voltage-to-current converters with differential integrated circuit preamplifiers to boost the initial signal amplitude, and with low pass filtering applied so as to obtain a video or signal envelope output.

Davis, Thomas J. (Richland, WA)

1980-01-01T23:59:59.000Z

334

Electronic Non-Contacting Linear Position Measuring System  

DOE Patents (OSTI)

A non-contacting linear position location system employs a special transmission line to encode and transmit magnetic signals to a receiver on the object whose position is to be measured. The invention is useful as a non-contact linear locator of moving objects, e.g., to determine the location of a magnetic-levitation train for the operation of the linear-synchronous motor drive system.

Post, Richard F. (Walnut Creek, CA)

2005-06-14T23:59:59.000Z

335

Solutions of differential equations by linear programming techniques  

E-Print Network (OSTI)

. INTRODUCTION II. LINEAR PROGRAMMING General Discussion. Theory of Linear ProSrsmming. a Duality . The Simplex Method anA LP/90. III. LINEAR DIFFZREKTAL EQUATIONS. General Discussion. A Limital Solution to a Differential Equation IV. THE ~ PROGRAMING... be traced back much further. A study of mathematical game theory was initiated. in 1928 by Von Neumann. In 1944 Von Neumann and Morgenstern published the book, Theory of Games and. Economic Behavior which is an economic application of minimax theory...

Saye, Jake Lee

2012-06-07T23:59:59.000Z

336

Abstract: Boussinesq systems -- derivation and the linear theory  

E-Print Network (OSTI)

Boussinesq equations and other systems for small-amplitude long waves in nonlinear dispersive media. Part I: derivation and the linear theory ...

337

An Augmented Primal-Dual Method for Linear Conic Programs  

E-Print Network (OSTI)

Apr 11, 2007 ... We propose a new iterative approach for solving linear programs over ...... for the random number generator to make the data reproducible.

2007-04-11T23:59:59.000Z

338

On the Global Optimality for Linear Constrained Rank Minimization ...  

E-Print Network (OSTI)

Nov 10, 2014 ... Abstract: The rank minimization with linear equality constraints has two closely related models, the low rank approximation model, that is to find ...

Xin Liu

2014-11-10T23:59:59.000Z

339

Optimization Online - Large-Scale Linear Programming Techniques ...  

E-Print Network (OSTI)

Large-Scale Linear Programming Techniques for the Design of Protein Folding Potentials. Michael Wagner (mwagner ***at*** odu.edu) Jaroslaw Meller (jmeller

Michael Wagner

340

Optimization Online - A new mixed integer linear programming ...  

E-Print Network (OSTI)

May 22, 2014 ... ... networks introduced in Stanimirovi\\'c and Mi\\v{s}kovi\\'c (2012). This paper introduces a new mixed integer linear programming formulation for ...

Aleksandra Petrovic

2014-05-22T23:59:59.000Z

Note: This page contains sample records for the topic "trough linear fresnel" 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

Analysis and design of linear switched reluctance motor;.  

E-Print Network (OSTI)

??Linear machine drives are strong candidates in both low and highspeed newlinetransit applications because of their ability to produce a propulsion newlineforce on the moving… (more)

Lenin N C

2014-01-01T23:59:59.000Z

342

A Linear Base Articulated Robot Arm for Surgical Endoscopy.  

E-Print Network (OSTI)

??This project involved developing a surgical robot assistant using an articulated robot running on a linear axis. The research concentrated on studying the localization of… (more)

Kracht, Aaron Arthur

2006-01-01T23:59:59.000Z

343

An EP theorem for dual linear complementarity problem  

E-Print Network (OSTI)

Mar 2, 2007 ... An EP theorem for dual linear complementarity problem. Illés Tibor (illes ***at*** math.elte.hu) Marianna Nagy (nmariann ***at*** cs.elte.hu)

Illés Tibor

2007-03-02T23:59:59.000Z

344

The Klynac: An Integrated Klystron and Linear Accelerator  

SciTech Connect

The Klynac concept integrates an electron gun, a radio frequency (RF) power source, and a coupled-cavity linear accelerator into a single resonant system

Potter, J. M., Schwellenbach, D., Meidinger, A.

2012-08-07T23:59:59.000Z

345

An Accelerated Linearized Alternating Direction Method of Multipliers  

E-Print Network (OSTI)

Feb 12, 2014 ... An Accelerated Linearized Alternating Direction Method of Multipliers. Yuyuan Ouyang(ouyang ***at*** ufl.edu) Yunmei Chen(yun ***at*** ...

Yuyuan Ouyang

2014-02-12T23:59:59.000Z

346

Calmness of linear programs under perturbations of all data ...  

E-Print Network (OSTI)

the nominal data, and not data in a neighborhood) for computing or estimating the calmness modulus of the optimal set (argmin) mapping in linear optimization

2014-06-18T23:59:59.000Z

347

On a new collection of stochastic linear programming test problems  

E-Print Network (OSTI)

Abstract: The purpose of this paper is to introduce a new test problem collection for stochastic linear programming that the authors have recently begun to ...

K. A. Ariyawansa

348

High-gradient compact linear accelerator  

DOE Patents (OSTI)

A high-gradient linear accelerator comprises a solid-state stack in a vacuum of five sets of disc-shaped Blumlein modules each having a center hole through which particles are sequentially accelerated. Each Blumlein module is a sandwich of two outer conductive plates that bracket an inner conductive plate positioned between two dielectric plates with different thicknesses and dielectric constants. A third dielectric core in the shape of a hollow cylinder forms a casing down the series of center holes, and it has a dielectric constant different that the two dielectric plates that sandwich the inner conductive plate. In operation, all the inner conductive plates are charged to the same DC potential relative to the outer conductive plates. Next, all the inner conductive plates are simultaneously shorted to the outer conductive plates at the outer diameters. The signal short will propagate to the inner diameters at two different rates in each Blumlein module. A faster wave propagates quicker to the third dielectric core across the dielectric plates with the closer spacing and lower dielectric constant. When the faster wave reaches the inner extents of the outer and inner conductive plates, it reflects back outward and reverses the field in that segment of the dielectric core. All the field segments in the dielectric core are then in unipolar agreement until the slower wave finally propagates to the third dielectric core across the dielectric plates with the wider spacing and higher dielectric constant. During such unipolar agreement, particles in the core are accelerated with gradients that exceed twenty megavolts per meter.

Carder, Bruce M. (205 Rogue River Hwy., Gold Hill, OR 97525)

1998-01-01T23:59:59.000Z

349

High-gradient compact linear accelerator  

DOE Patents (OSTI)

A high-gradient linear accelerator comprises a solid-state stack in a vacuum of five sets of disc-shaped Blumlein modules each having a center hole through which particles are sequentially accelerated. Each Blumlein module is a sandwich of two outer conductive plates that bracket an inner conductive plate positioned between two dielectric plates with different thicknesses and dielectric constants. A third dielectric core in the shape of a hollow cylinder forms a casing down the series of center holes, and it has a dielectric constant different that the two dielectric plates that sandwich the inner conductive plate. In operation, all the inner conductive plates are charged to the same DC potential relative to the outer conductive plates. Next, all the inner conductive plates are simultaneously shorted to the outer conductive plates at the outer diameters. The signal short will propagate to the inner diameters at two different rates in each Blumlein module. A faster wave propagates quicker to the third dielectric core across the dielectric plates with the closer spacing and lower dielectric constant. When the faster wave reaches the inner extents of the outer and inner conductive plates, it reflects back outward and reverses the field in that segment of the dielectric core. All the field segments in the dielectric core are then in unipolar agreement until the slower wave finally propagates to the third dielectric core across the dielectric plates with the wider spacing and higher dielectric constant. During such unipolar agreement, particles in the core are accelerated with gradients that exceed twenty megavolts per meter. 10 figs.

Carder, B.M.

1998-05-26T23:59:59.000Z

350

Optimized remedial groundwater extraction using linear programming  

SciTech Connect

Groundwater extraction systems are typically installed to remediate contaminant plumes or prevent further spread of contamination. These systems are expensive to install and maintain. A traditional approach to designing such a wellfield uses a series of trial-and-error simulations to test the effects of various well locations and pump rates. However, the optimal locations and pump rates of extraction wells are difficult to determine when objectives related to the site hydrogeology and potential pumping scheme are considered. This paper describes a case study of an application of linear programming theory to determine optimal well placement and pump rates. The objectives of the pumping scheme were to contain contaminant migration and reduce contaminant concentrations while minimizing the total amount of water pumped and treated. Past site activities at the area under study included disposal of contaminants in pits. Several groundwater plumes have been identified, and others may be present. The area of concern is bordered on three sides by a wetland, which receives a portion of its input budget as groundwater discharge from the pits. Optimization of the containment pumping scheme was intended to meet three goals: (1) prevent discharge of contaminated groundwater to the wetland, (2) minimize the total water pumped and treated (cost benefit), and (3) avoid dewatering of the wetland (cost and ecological benefits). Possible well locations were placed at known source areas. To constrain the problem, the optimization program was instructed to prevent any flow toward the wetland along a user-specified border. In this manner, the optimization routine selects well locations and pump rates so that a groundwater divide is produced along this boundary.

Quinn, J.J.

1995-12-31T23:59:59.000Z

351

Linear and non-linear Granger causality between oil spot and futures prices: A wavelet based test  

Science Journals Connector (OSTI)

Abstract This study is the first attempt to investigate both the linear and non-linear Granger causality between wavelet transformed spot and futures oil prices. Our findings consistently indicate bidirectional causality between the spot and futures oil markets at different time scales, under linear and non-linear causality assumptions, and also during the recent financial crisis. Our results tend to shed further light on the ongoing controversy over the relative price discovery role played by spot market as opposed to futures market in oil price fluctuations, especially during periods of high uncertainty.

Mohammed Alzahrani; Mansur Masih; Omar Al-Titi

2014-01-01T23:59:59.000Z

352

Coordinated Output Regulation of Multiple Heterogeneous Linear Systems  

E-Print Network (OSTI)

, the generalizations of coordination of multiple linear dynamic systems to the cooperative output regulation problemCoordinated Output Regulation of Multiple Heterogeneous Linear Systems Ziyang Meng, Tao Yang, Dimos V. Dimarogonas, and Karl H. Johansson Abstract-- The coordinated output regulation problem

Dimarogonas, Dimos

353

Faster PDE-based simulations using robust composite linear solvers  

Science Journals Connector (OSTI)

Many large-scale scientific simulations require the solution of nonlinear partial differential equations (PDEs). The effective solution of such nonlinear PDEs depends to a large extent on efficient and robust sparse linear system solution. In this paper, ... Keywords: Newton-Krylov methods, composite methods, large-scale PDE-based simulations, multi-algorithms, sparse linear solution

S. Bhowmick; P. Raghavan; L. McInnes; B. Norris

2004-04-01T23:59:59.000Z

354

Linear steady flows in a two-dimensional Boussinesq  

E-Print Network (OSTI)

Linear steady flows in a two-dimensional Boussinesq fluid driven by thermal forcing P.A.J. van Melick De Bilt | 2010 | Stageverslag #12;#12;Linear steady flows in a two-dimensional Boussinesq fluid-rotating, small-amplitude and Boussinesq flow. A step-by-step approach has been used towards a smooth localized

Stoffelen, Ad

355

6.4 Composition and invertibility of linear transformations  

E-Print Network (OSTI)

number of reflections is a reflection composed with a rotation. #12; Yaw: z-axis (up direction), pitch and ). See Example 5. Conversely, any rotation can be factored into yaw, pitch, roll rotations. #12; We wish=Ax given by a linear system as in (18). We have x=A-1y given by a linear system. We can obtain the second

Choi, Suhyoung

356

Proof-of-Principle Detonation Driven, Linear Electric Generator Facility  

E-Print Network (OSTI)

Proof-of-Principle Detonation Driven, Linear Electric Generator Facility Eric M. Braun, Frank K. Lu is described in which a detonation-driven piston system has been integrated with a linear generator in order in a single mass, two-spring system where the detonation wave pressure may be modeled as a variable force

Texas at Arlington, University of

357

Green's Conjecture and Testing Linear Invariant Properties Asaf Shapira  

E-Print Network (OSTI)

in combinatorics. The removal lemma has many applications in different areas like extremal graph theory, additive of linear equations in p unknowns Mx = b is said to have the removal property if every set S {1, . . . , n, by the removal of o(n) elements. Green [GAFA 2005] proved that a single homogenous linear equation always has

Goldreich, Oded

358

Applications of Polyparameter Linear Free Energy Relationships in Environmental Chemistry  

Science Journals Connector (OSTI)

Applications of Polyparameter Linear Free Energy Relationships in Environmental Chemistry ... Polyparameter linear free energy relationships (PP-LFERs) have been proven to be useful to characterize the equilibrium partitioning of organic chemicals in various environmental and technical partitioning systems and predict the respective partition coefficients. ...

Satoshi Endo; Kai-Uwe Goss

2014-10-03T23:59:59.000Z

359

LINEAR LATTICE BOLTZMANN SCHEMES FOR PARAMETERS CHOICES AND ISOTROPY PROPERTIES  

E-Print Network (OSTI)

LINEAR LATTICE BOLTZMANN SCHEMES FOR ACOUSTIC: PARAMETERS CHOICES AND ISOTROPY PROPERTIES ADELINE parameters choi- ces for linear lattice Boltzmann schemes according to the definition of the isotropic order2Q9 scheme. Introduction Lattice Boltzmann schemes [7, 11, 8] are numerically very interesting be

Paris-Sud XI, Université de

360

Drift tube suspension for high intensity linear accelerators  

DOE Patents (OSTI)

The disclosure relates to a drift tube suspension for high intensity linear accelerators. The system comprises a series of box-sections girders independently adjustably mounted on a linear accelerator. A plurality of drift tube holding stems are individually adjustably mounted on each girder.

Liska, Donald J. (Los Alamos, NM); Schamaun, Roger G. (Los Alamos, NM); Clark, Donald C. (Los Alamos, NM); Potter, R. Christopher (Los Alamos, NM); Frank, Joseph A. (Los Alamos, NM)

1982-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trough linear fresnel" 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

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

E-Print Network (OSTI)

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

Giger, Christine

362

Duality in spaces of finite linear combinations of atoms  

E-Print Network (OSTI)

Duality in spaces of finite linear combinations of atoms Fulvio Ricci and Joan Verdera Abstract In this note we describe the dual and the completion of the space of finite linear combinations of (p, #)­atoms, #)­atoms, 0

Verdera, Joan

363

Drift tube suspension for high intensity linear accelerators  

DOE Patents (OSTI)

The disclosure relates to a drift tube suspension for high intensity linear accelerators. The system comprises a series of box-sections girders independently adjustably mounted on a linear accelerator. A plurality of drift tube holding stems are individually adjustably mounted on each girder.

Liska, D.J.; Schamaun, R.G.; Clark, D.C.; Potter, R.C.; Frank, J.A.

1980-03-11T23:59:59.000Z

364

Differentiability properties of Rank Linear Utilities G. Carlier  

E-Print Network (OSTI)

Differentiability properties of Rank Linear Utilities G. Carlier April 8, 2006 Abstract We study generalize the rank dependent expected utility and are called rank-linear utilities in deci- sion theory results generalize those obtained for the rank dependent expected utility in [1]. The author wishes

Carlier, Guillaume

365

Portfolio optimization with linear and fixed transaction costs  

E-Print Network (OSTI)

Portfolio optimization with linear and fixed transaction costs Miguel Sousa Lobo1 Maryam Fazel2 optimization with linear and fixed transaction costs Abstract We consider the problem of portfolio selection of the return, and bounds on different shortfall probabilities are efficiently handled by convex optimization

366

Variable-energy drift-tube linear accelerator  

DOE Patents (OSTI)

A linear accelerator system includes a plurality of post-coupled drift-tubes wherein each post coupler is bistably positionable to either of two positions which result in different field distributions. With binary control over a plurality of post couplers, a significant accumlative effect in the resulting field distribution is achieved yielding a variable-energy drift-tube linear accelerator.

Swenson, Donald A. (Los Alamos, NM); Boyd, Jr., Thomas J. (Los Alamos, NM); Potter, James M. (Los Alamos, NM); Stovall, James E. (Los Alamos, NM)

1984-01-01T23:59:59.000Z

367

Helmholtz Alliance Linear Collider Forum Proceedings of the Workshops  

E-Print Network (OSTI)

Helmholtz Alliance Linear Collider Forum Proceedings of the Workshops Hamburg, Munich, Hamburg 2010 of the Helmholtz Alliance Linear Collider Forum 2010­2012, Hamburg, M¨unchen, Hamburg, Germany Conference homepage, Internationales Congress Center, Dresden (at the 4th Annual Workshop of the Helmholtz Alliance `Physics

368

Intelligent Control of the Linear Motor Direct Drive Feed System for CNC Machine Tools  

Science Journals Connector (OSTI)

The linear feed system directly driven by a linear motor is more and more widely used in high speed CNC machine tools. In this linear “direct drive” feed system, all mechanical transmission elements are eliminated. The linear motor’s ... Keywords: intelligent control, linear motor, direct drive, linear feed system, machine tool

Shuhong Xiao; Guangyuan Zheng; Shuquan Chen

2008-12-01T23:59:59.000Z

369

MHK Technologies/The Linear Generator | Open Energy Information  

Open Energy Info (EERE)

Linear Generator Linear Generator < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage The Linear Generator.jpg Technology Profile Primary Organization Trident Energy Ltd Project(s) where this technology is utilized *MHK Projects/TE4 Technology Resource Click here Wave Technology Type Click here Point Absorber Technology Readiness Level Click here TRL 1-3: Discovery / Concept Definition / Early Stage Development & Design & Engineering Technology Description The simplicity of the Trident Energy solution is based around the fact that the system has only one moving part - float / linear generator translator, which is powered by the motion of floats placed in the sea. As waves pass through the wavefarm, so the floats rise and fall. This causes relative motion between the two components of the linear generator (the translator and stator) and electricity is immediately generated. There is absolutely no contact between the two parts of the generator as the energy conversion is entirely electromagnetic.

370

Conformational properties of blends of cyclic and linear polymer melts  

Science Journals Connector (OSTI)

An adapted version of the annealing algorithm to identify primitive paths of a melt of ring polymers is presented. This algorithm ensures that the primitive path length becomes zero for nonconcatenated rings, and that no entanglements are observed. The bond-fluctuation model was used to simulate ring-linear blends with N=150 and 300 monomers. The primitive path length and the average number of entanglements of the linear component were found to be independent of the blend composition. In contrast, the primitive path length and the average number of entanglements on a ring molecule increased approximately linearly with the fraction of linear chains, and for large N, they approached values comparable with linear chains. Threading of ring molecules by linear chains, and ring-ring interactions were observed only in the presence of linear chains. It is conjectured that for large N, these latter interactions facilitate the formation of a percolating entangled network, thereby resulting in a disproportionate retardation of the dynamical processes.

Gopinath Subramanian and Sachin Shanbhag

2008-01-14T23:59:59.000Z

371

Fluid membranes can drive linear aggregation of adsorbed spherical nanoparticles  

E-Print Network (OSTI)

Using computer simulations we show that lipid membranes can mediate linear aggregation of spherical nanoparticles binding to it for a wide range of biologically relevant bending rigidities. This result is in net contrast with the isotropic aggregation of nanoparticles on fluid interfaces or the expected clustering of isotropic insertions in biological membranes. We present a phase diagram indicating where linear aggregation is expected, and compute explicitly the free energy barriers associated with linear and isotropic aggregation. Finally, we provide simple scaling arguments to explain this phenomenology.

Andela Šari?; Angelo Cacciuto

2011-12-29T23:59:59.000Z

372

The Conjugate Linearized Ricci Flow on Closed 3-Manifolds  

E-Print Network (OSTI)

We characterize the conjugate linearized Ricci flow and the associated backward heat kernel on closed three--manifolds of bounded geometry. We discuss their properties, and introduce the notion of Ricci flow conjugated constraint sets which characterizes a way of Ricci flow averaging metric dependent geometrical data. We also provide an integral representation of the Ricci flow metric itself and of its Ricci tensor in terms of the heat kernel of the conjugate linearized Ricci flow. These results, which readily extend to closed n-dimensional manifolds, yield for various conservation laws, monotonicity and asymptotic formulas for the Ricci flow and its linearization.

Mauro Carfora

2007-10-17T23:59:59.000Z

373

Homogeneous Charge Compression Ignition Free Piston Linear Alternator  

SciTech Connect

An experimental and theoretical investigation of a homogeneous charge compression ignition (HCCI) free piston powered linear alternator has been conducted to determine if improvements can be made in the thermal and conversion efficiencies of modern electrical generator systems. Performance of a free piston engine was investigated using a rapid compression expansion machine and a full cycle thermodynamic model. Linear alternator performance was investigated with a computer model. In addition linear alternator testing and permanent magnet characterization hardware were developed. The development of the two-stroke cycle scavenging process has begun.

Janson Wu; Nicholas Paradiso; Peter Van Blarigan; Scott Goldsborough

1998-11-01T23:59:59.000Z

374

MHK Technologies/Ocean Current Linear Turbine | Open Energy Information  

Open Energy Info (EERE)

Linear Turbine Linear Turbine < MHK Technologies Jump to: navigation, search << Return to the MHK database homepage Ocean Current Linear Turbine.jpg Technology Profile Primary Organization Ocean Energy Company LLC Technology Type Click here Seabed mooring system Technology Readiness Level Click here TRL 5 6 System Integration and Technology Laboratory Demonstration Technology Description Endless cable loop with parachutes spliced to cable which moored in an ocean current pulls the cable through rotors which in turn power conventional electricity generators See US Patent 3 887 817 Additional patent pending Technology Dimensions Device Testing Date Submitted 30:08.6 << Return to the MHK database homepage Retrieved from "http://en.openei.org/w/index.php?title=MHK_Technologies/Ocean_Current_Linear_Turbine&oldid=681618"

375

Linear Electric Field Time-Of-Flight Ion Mass Spectrometers  

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

Linear Electric Field Time-Of-Flight Ion Mass Spectrometers Linear Electric Field Time-Of-Flight Ion Mass Spectrometers Linear Electric Field Time-Of-Flight Ion Mass Spectrometers Time-of-flight mass spectrometer comprising a first drift region and a second drift region enclosed within an evacuation chamber. Available for thumbnail of Feynman Center (505) 665-9090 Email Linear Electric Field Time-Of-Flight Ion Mass Spectrometers Time-of-flight mass spectrometer comprising a first drift region and a second drift region enclosed within an evacuation chamber; a means of introducing an analyte of interest into the first drift region; a pulsed ionization source which produces molecular ions from said analyte of interest; a first foil positioned between the first drift region and the second drift region, which dissociates said molecular ions into constituent

376

Optimization Online - Group sparsity via linear-time projection  

E-Print Network (OSTI)

Jul 31, 2008 ... Group sparsity via linear-time projection. Ewout van den Berg (ewout78 ***at*** cs.ubc.ca) Mark Schmidt (schmidtm ***at*** cs.ubc.ca) Michael ...

Ewout van den Berg

2008-07-31T23:59:59.000Z

377

Linear Operators and Their Spectra Web Supplement, version 5  

E-Print Network (OSTI)

Linear Operators and Their Spectra Web Supplement, version 5 E Brian Davies Department to put a copy on the web, in the hope that some readers may be encouraged to buy the paper version. #12

Davies, Brian

378

Linear Operators and Their Spectra Web Supplement, version 25  

E-Print Network (OSTI)

Linear Operators and Their Spectra Web Supplement, version 25 E Brian Davies Department, but the author has permis- sion to put a copy on the web, in the hope that some readers may be encouraged to buy

Davies, Brian

379

Linear Operators and Their Spectra Web Supplement, version 32  

E-Print Network (OSTI)

Linear Operators and Their Spectra Web Supplement, version 32 E Brian Davies Department, but the author has permis- sion to put a copy on the web, in the hope that some readers may be encouraged to buy

Davies, Brian

380

Linear Operators and Their Spectra Web Supplement, version 21  

E-Print Network (OSTI)

Linear Operators and Their Spectra Web Supplement, version 21 E Brian Davies Department to put a copy on the web, in the hope that some readers may be encouraged to buy the paper version. #12

Davies, Brian

Note: This page contains sample records for the topic "trough linear fresnel" 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

Probabilistic Multiple-Linear Regression Modeling for Tropical Cyclone Intensity  

Science Journals Connector (OSTI)

The authors describe the development and verification of a statistical model relating tropical cyclone intensity to the local large-scale environment. A multiple linear regression framework is used to estimate the expected intensity of a tropical ...

Chia-Ying Lee; Michael K. Tippett; Suzana J. Camargo; Adam H. Sobel

382

THE TURING DEGREES AND THEIR LACK OF LINEAR JASPER DEANTONIO  

E-Print Network (OSTI)

THE TURING DEGREES AND THEIR LACK OF LINEAR ORDER JASPER DEANTONIO Abstract. This paper is a study, 2010. 1 #12;2 JASPER DEANTONIO · Tape Symbols S = {s1, s2, s3, ..., sn}: These symbols are the only

May, J. Peter

383

A Convex Approach for Designing "Good" Linear Embeddings  

E-Print Network (OSTI)

constraints in into linear constraints in ("Lifting trick") · Use a nuclear-norm relaxation of the rank #12;MNIST Dataset M = 10 basis functions suffice to achieve = 0.2 #12;- Goal: preserve neighborhood

384

Preconditioning for the mixed formulation of linear plane elasticity  

E-Print Network (OSTI)

. An overlapping Schwarz preconditioner and a multigrid preconditioner for the discrete system are developed and analyzed. We start by introducing the mixed formulation (stress-displacement formulation) for the linear plane elasticity problem and its discretization...

Wang, Yanqiu

2005-11-01T23:59:59.000Z

385

Approximate Linear Programming for Firstorder MDPs Scott Sanner  

E-Print Network (OSTI)

, the bounds that we derive for approximation error apply equally to all domain instantiations (i.eApproximate Linear Programming for First­order MDPs Scott Sanner University of Toronto Department

Sanner, Scott

386

Testing Generalized Linear Models Using Smoothing Spline Methods  

E-Print Network (OSTI)

Testing Generalized Linear Models Using Smoothing Spline Methods Anna Liu, Wendy Meiring and Yuedong Wang University of California, Santa Barbara Abstract This article considers testing exponential families. The tests developed are based on the connection between the smoothing spline models

Meiring, Wendy

387

Optimization of a dual acting, magnetically driven, linear actuator  

E-Print Network (OSTI)

In this study the geometry of a dual acting, magnetically driven, linear motion actuator will be optimized. This will be accomplished by modeling the system through a set of differential equations to be solved in Matlab. An ANSYS finite element...

Willerton, Justin Ryan

2012-06-07T23:59:59.000Z

388

Linear Road : benchmarking stream-based data management systems  

E-Print Network (OSTI)

This thesis describes the design, implementation, and execution of the Linear Road benchmark for stream-based data management systems. The motivation for benchmarking and the selection of the benchmark application are ...

Tibbetts, Richard S. (Richard Singleton), 1979-

2003-01-01T23:59:59.000Z

389

Solving second order linear differential equations with Klein's theorem  

Science Journals Connector (OSTI)

Given a second order linear differential equations with coefficients in a field k=C(x), the Kovacic algorithm finds all Liouvillian solutions, that is, solutions that one can write in terms of exponentials, logarithms, integration ...

M. van Hoeij; J.-A. Weil

2005-07-01T23:59:59.000Z

390

Linear Supply Function Equilibrium: Generalizations, Application, and Limitations  

E-Print Network (OSTI)

reforms in England and Wales (E&W). Green (1996) used a linear version of this model and applied in the electricity industry. Recent reforms of the electricity industry around the world have stimulated numerous

California at Berkeley. University of

391

Verification of a technical system model with linear temporal logic  

Science Journals Connector (OSTI)

We consider the verification problem for an electromechanical device with a variable number of connectors and solve it with the modal logic LTL (Linear Temporal Logic). In the course of the analysis, we prove continuity and unambiguity theorems for the ...

A. N. Nepeivoda

2012-09-01T23:59:59.000Z

392

Householder Symposium on Numerical Linear Algebra June 1721, 2002  

E-Print Network (OSTI)

for discussions. This year's symposium is held at Peebles Hotel Hydro in the small town of Peebles (populationHouseholder Symposium on Numerical Linear Algebra June 17­21, 2002 Peebles Hotel Hydro, Scotland

Higham, Nicholas J.

393

Self-assembly of linear-dendritic diblock copolymers  

E-Print Network (OSTI)

Linear-dendritic diblock copolymers combine the properties of dendritic macromolecules with the morphology of block copolymers, making it possible to create nanostructured materials which self assemble in the bulk state ...

Johnson, Mark Alan, 1975-

2002-01-01T23:59:59.000Z

394

Reactive scattering in the bending-corrected rotating linear model  

SciTech Connect

We review the theory and applications of the Bending-Corrected Rotating Linear Model (BCRLM) to problems in the quantum description of reactions between atoms and diatomic molecules. 110 refs.

Walker, R.B.; Hayes, E.F.

1985-01-01T23:59:59.000Z

395

Filtration problems with a piecewise-linear resistance law  

Science Journals Connector (OSTI)

The article discusses elementary solutions of problems of nonlinear filtration with a piece-wise-linear resistance law, and analyzes their behavior with a relative increase in the resistance in the region of smal...

V. M. Entov; T. A. Malakhova

396

RF power amplifier linearity compensation for MRI systems  

E-Print Network (OSTI)

In this thesis, a polar-feedback linearization system for use with MRI RF power amplifiers was designed and simulated. The design here presented is intended to replace Analogic's (located in Peabody, Massachusetts) ...

Torres Chico, Gabriel

2010-01-01T23:59:59.000Z

397

The Equivalence of Linear Programs and Zero-Sum Games  

E-Print Network (OSTI)

he noted that there was one case in which the reduction does not work. This also led .... linear program does not exist. ...... In: Handbook of game theory with eco-.

2012-01-15T23:59:59.000Z

398

The viscoelastic properties of linear-star blends  

E-Print Network (OSTI)

In order to understand the nature of polydispersity and characterize the effect of branching architecture, the model blend of linear and star polymer, which is the simplest branched polymer, is contrived. In this blend system, chain dynamics...

Lee, Jung Hun

2000-01-01T23:59:59.000Z

399

Worldsheet instantons and (0,2) linear models  

E-Print Network (OSTI)

We study the stability of heterotic compactifications described by (0,2) gauged linear sigma models with respect to worldsheet instanton corrections to the space-time superpotential following the work of Beasley and Witten. We show that generic models elude the vanishing theorem proved there, and may not determine supersymmetric heterotic vacua. We then construct a subclass of linear models for which a vanishing theorem holds, generating an extensive list of consistent heterotic backgrounds.

Marco Bertolini; M. Ronen Plesser

2014-10-16T23:59:59.000Z

400

A development of MOS linear active load schemes  

E-Print Network (OSTI)

A DEVELOPMENT OF MOS LINEAR ACTIVE LOAD SCHEMES A Thesis by ROBERT ALAN MALLETT Submitted to the Graduate College of Texas AgrM University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE December 1985 Major...-Angulo ( ember) Thomas R. Fischer (Member) Charl lover (Member) J. W. Howze (Head of Department) December 1985 ABSTRACT The Development of MOS Linear Active Load Schemes. (December 1985) Robert Alan Mallett, B, S, , South Dakota State University...

Mallett, Robert Alan

1985-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "trough linear fresnel" 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

Free piston variable-stroke linear-alternator generator  

DOE Patents (OSTI)

A free-piston variable stroke linear-alternator AC power generator for a combustion engine is described. An alternator mechanism and oscillator system generates AC current. The oscillation system includes two oscillation devices each having a combustion cylinder and a flying turnbuckle. The flying turnbuckle moves in accordance with the oscillation device. The alternator system is a linear alternator coupled between the two oscillation devices by a slotted connecting rod. 8 figs.

Haaland, C.M.

1998-12-15T23:59:59.000Z

402

Comparison of linear and nonlinear acoustic probing of rock salt  

E-Print Network (OSTI)

COMPARISON OF LINEAR AND NONLINEAR ACOUSTIC PROBING OF ROCK SALT A Thesis by ALBERT MIN-HAO WANG Submitted to the Graduate College of Texas AIIM University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE August... 1980 Major Subject: Geophysics COMPARISON OF LINEAR AND NONLINEAR ACOUSTIC PROBING OF ROCK SALT A Thesis by ALBERT MIN-HAO 'RANG Approved as to style and content by: l('-/c~k~&(. Chairman o Comm ' ee Member) Member / I Member Head...

Wang, Albert Min-Hao

2012-06-07T23:59:59.000Z

403

Linear Response Theory 15.0.6 Fourier Transform  

E-Print Network (OSTI)

Chapter 15 Linear Response Theory 15.0.6 Fourier Transform A function of time f(t) which transform of f(t). Note that if f(t) = (t) such that (t)dt = 1, then F() = 1 2 , and (t) = 1 2 - eit d 85 #12;86 CHAPTER 15. LINEAR RESPONSE THEORY 15.0.7 Convolution Consider f(t) with transform F() and h

Palffy-Muhoray, Peter

404

On the linearization theorem of Fenner and Pinto  

Science Journals Connector (OSTI)

This paper reports an improvement of the linearization theorem of Fenner and Pinto (1999) [22]. Fenner and Pinto presented a version of Hartman’s result. They showed that there exists a one-to-one correspondence between solutions of the linear system and the nonlinear system. Moreover, if H ( t , x ) denotes the transformation, then H ( t , x ) ? x is uniformly bounded. However, no proof of the Hölder regularity of the transformation H ( t , x ) appears in Fenner and Pinto (1999) [22]. The main objective in this paper is precisely to give a proof of the Hölder regularity of the transformation H ( t , x ) . Namely, we show that the conjugating function H ( t , x ) in the Hartman–Grobman theorem, is always Hölder continuous (and has Hölder continuous inverse). Moreover, we weakened an important assumption in Fenner and Pinto (1999) [22]. Fenner and Pinto obtained the linearization theorem by setting that the whole linear system should satisfy IS condition. In this paper, this assumption is reduced. In fact, it is enough to assume that the linear system partially satisfies IS condition. Therefore, we improve the linearization theorem of Fenner and Pinto.

Yong-Hui Xia; Xiaodan Chen; Valery G. Romanovski

2013-01-01T23:59:59.000Z

405

Synthesis of linear quantum stochastic systems via quantum feedback networks  

E-Print Network (OSTI)

Recent theoretical and experimental investigations of coherent feedback control, the feedback control of a quantum system with another quantum system, has raised the important problem of how to synthesize a class of quantum systems, called the class of linear quantum stochastic systems, from basic quantum optical components and devices in a systematic way. The synthesis theory sought in this case can be naturally viewed as a quantum analogue of linear electrical network synthesis theory and as such has potential for applications beyond the realization of coherent feedback controllers. In earlier work, Nurdin, James and Doherty have established that an arbitrary linear quantum stochastic system can be realized as a cascade connection of simpler one degree of freedom quantum harmonic oscillators, together with a direct interaction Hamiltonian which is bilinear in the canonical operators of the oscillators. However, from an experimental perspective and based on current methods and technologies, direct interaction Hamiltonians are challenging to implement for systems with more than just a few degrees of freedom. In order to facilitate more tractable physical realizations of these systems, this paper develops a new synthesis algorithm for linear quantum stochastic systems that relies solely on field-mediated interactions, including in implementation of the direct interaction Hamiltonian. Explicit synthesis examples are provided to illustrate the realization of two degrees of freedom linear quantum stochastic systems using the new algorithm.

H. I. Nurdin

2009-05-06T23:59:59.000Z

406

Information content of the non-linear matter power spectrum  

E-Print Network (OSTI)

We use an ensemble of N-body simulations of the currently favoured (concordance) cosmological model to measure the amount of information contained in the non-linear matter power spectrum about the amplitude of the initial power spectrum. Two surprising results emerge from this study: (i) that there is very little independent information in the power spectrum in the translinear regime (k ~ 0.2-0.8 Mpc/h at the present day) over and above the information at linear scales and (ii) that the cumulative information begins to rise sharply again with increasing wavenumber in the non-linear regime. In the fully non-linear regime, the simulations are consistent with no loss of information during translinear and non-linear evolution. If this is indeed the case then the results suggest a picture in which translinear collapse is very rapid, and is followed by a bounce prior to virialization, impelling a wholesale revision of the HKLM-PD formalism.

C. D. Rimes; A. J. S. Hamilton

2005-02-03T23:59:59.000Z

407

Development of integral bladed rotor using linear optimisation technique  

Science Journals Connector (OSTI)

Bladed disks are the most flexible elements in high speed rotating machinery. Stress analysis of these elements present some challenges. These challenges stem from high stress gradients due to contact faces, the non-linearities attending conforming contact with friction. Thermal gradients are also encountered across the disc bore and rim due to uneven temperature distribution. The rim of the disc is made heavier to resist the centrifugal pull of the blade, thus making the assembly heavier. Investigations have been carried out to develop and improve 'blisks' which are integrated version of blades and disc, offering significant weight saving. The present paper describes the possible development process of upgrading a general purpose conventional bladed disc of a single stage compressor into blisk, using linear programme, a finite element analysis tool for linear optimisation, as a dedicated 'design-tool' keeping the same operating conditions and the allowable design limits through numerical models. Design methodology, burst-failure criteria of blisk and bladed disc are discussed in full length. This tool developed exploits the quick convergence ability of a linear system for handling large iterations and overcomes the limitation imposed by material non-linearity, over-speed and burst margin for all decision points based on stress, strain and displacement, in the design-flow process.

K. Kumar; S.L. Ajit Prasad; K. Ramachandra

2012-01-01T23:59:59.000Z

408

Information Resources: LED Replacements for Linear Fluorescent Lamps  

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

Replacements for Linear Fluorescent Lamps Webcast Replacements for Linear Fluorescent Lamps Webcast In this June 20, 2011 webcast on LED products marketed as replacements for linear fluorescent lamps, Jason Tuenge of the Pacific Northwest National Laboratory (PNNL) discussed current Lighting Facts-listed products as well as products evaluated in the latest CALiPER reports. Eric Richman, also of PNNL, reported on a recently completed GATEWAY demonstration project, in which LED and fluorescent lamps were installed in a variety of recessed troffer luminaires for comparison in an office environment. The presentation concluded with a discussion of specifications listed in a newly updated technology fact sheet. View presentation slides View the text-alternative version View the webcast (WMV 16 MB) Download Windows Media Player

409

Linear Collider Final Focus Magnet Construction | Superconducting Magnet  

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

Linear Collider Final Focus Magnet Construction Linear Collider Final Focus Magnet Construction The final focus magnets for the International Linear Collider require very small quadrupoles be placed within the detector background field for both the entrance and exit beams. The use of superconducting magnets for this function provide solutions to several problems confronting the machine designers. One constraint is the operation within the 3 tesla detector field. The direct wind magnets are capable of operation without the use of magnetic materials in their construction, making them ideal for compact focussing solutions within detectors. The second constraint is the small physical size dictated by the crossing angle of the beams and proximity to the IR within the detector solenoid. The Direct Wind design does not require a collar to withstand Lorentz

410

Generalized universal instability: Transient linear amplification and subcritical turbulence  

E-Print Network (OSTI)

In this work we numerically demonstrate both significant transient (i.e. non-modal) linear amplification and sustained nonlinear turbulence in a kinetic plasma system with no unstable eigenmodes. The particular system considered is an electrostatic plasma slab with magnetic shear, kinetic electrons and ions, weak collisions, and a density gradient, but with no temperature gradient. In contrast to hydrodynamic examples of non-modal growth and subcritical turbulence, here there is no sheared flow in the equilibrium. Significant transient linear amplification is found when the magnetic shear and collisionality are weak. It is also demonstrated that nonlinear turbulence can be sustained if initialized at sufficient amplitude. We prove these two phenomena are related: when sustained turbulence occurs without unstable eigenmodes, states that are typical of the turbulence must yield transient linear amplification of the gyrokinetic free energy.

Landreman, Matt; Dorland, William

2015-01-01T23:59:59.000Z

411

APPLICATION OF NEURAL NETWORK ALGORITHMS FOR BPM LINEARIZATION  

SciTech Connect

Stripline BPM sensors contain inherent non-linearities, as a result of field distortions from the pickup elements. Many methods have been devised to facilitate corrections, often employing polynomial fitting. The cost of computation makes real-time correction difficult, particulalry when integer math is utilized. The application of neural-network technology, particularly the multi-layer perceptron algorithm, is proposed as an efficient alternative for electrode linearization. A process of supervised learning is initially used to determine the weighting coefficients, which are subsequently applied to the incoming electrode data. A non-linear layer, known as an ?activation layer,? is responsible for the removal of saturation effects. Implementation of a perceptron in an FPGA-based software-defined radio (SDR) is presented, along with performance comparisons. In addition, efficient calculation of the sigmoidal activation function via the CORDIC algorithm is presented.

Musson, John C. [JLAB; Seaton, Chad [JLAB; Spata, Mike F. [JLAB; Yan, Jianxun [JLAB

2012-11-01T23:59:59.000Z

412

Unexpected Angular Dependence of X-Ray Magnetic Linear Dichroism  

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

Unexpected Angular Dependence of Unexpected Angular Dependence of X-Ray Magnetic Linear Dichroism Unexpected Angular Dependence of X-Ray Magnetic Linear Dichroism Print Wednesday, 29 August 2007 00:00 Using spectroscopic information for magnetometry and magnetic microscopy obviously requires detailed theoretical understanding of spectral shape and magnitude of dichroism signals. A research team at ALS Beamline 4.0.2 has now shown unambiguously that, contrary to common belief, spectral shape and magnitude of x-ray magnetic linear dichroism (XMLD) are not only determined by the relative orientation of magnetic moments and x-ray polarization, but their orientation relative to the crystallographic axes must be taken into account for accurate interpretation of XMLD data. Magnetism and X Rays

413

E-Print Network 3.0 - asymptotic non-linear solutions Sample...  

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

boundary... ) transits into a non- linear regime faster than the hexagonal or square bubble, 82... top, and with the stability criteria, the non-linear problem can be...

414

Flow and heat transfer around a linear array of spheres  

SciTech Connect

Laminar fluid flow and forced convection heat transfer over equally space linear arrays of spheres are analyzed using the finite element package FIDAP. For the arrays, sphere spacings of 1.5, 2, and 3 diameters are examined at Reynolds numbers of 40, 80, and 120 and Prandtl numbers ranging from 0.73 to 7.3. Average Nusselt numbers and drag coefficient data for a linear array of eight spheres (as an approximation to the developing region) and a single sphere with periodic boundary conditions (as an approximation to fully developed flow) are presented and correlated.

Lloyd, B. (Marathon Oil Co., Shreveport, LA (United States)); Boehn, R. (Univ. of Nevada, Las Vegas, NV (United States). Mechanical Engineering Dept.)

1994-08-01T23:59:59.000Z

415

Linear assignment maps for correlated system-environment states  

SciTech Connect

Assignment maps are mathematical operators that describe initial system-environment states for open quantum systems. We re-examine the notion of assignments that account for correlations between the system and the environment and show that these maps can be made linear at the expense of giving up positivity or consistency of the map. We study the role of positivity and consistency of the map and show the effects of relaxing these. Finally, we establish a connection between the violation of the positivity of linear assignments and the no-broadcasting theorem.

Rodriguez-Rosario, Cesar A.; Aspuru-Guzik, Alan [Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts (United States); Modi, Kavan [Centre for Quantum Technologies, National University of Singapore (Singapore)

2010-01-15T23:59:59.000Z

416

Extended Linear Response for Bioanalytical Applications Using Multiple Enzymes  

E-Print Network (OSTI)

We develop a framework for optimizing a novel approach to extending the linear range of bioanalytical systems and biosensors by utilizing two enzymes with different kinetic responses to the input chemical as their substrate. Data for the flow-injection amperometric system devised for detection of lysine based on the function of L-Lysine-alpha-Oxidase and Lysine-2-monooxygenase are analyzed. Lysine is a homotropic substrate for the latter enzyme. We elucidate the mechanism for extending the linear response range and develop optimization techniques for future applications of such systems.

Privman, Vladimir; Simonian, Aleksandr

2013-01-01T23:59:59.000Z

417

Extended Linear Response for Bioanalytical Applications Using Multiple Enzymes  

E-Print Network (OSTI)

We develop a framework for optimizing a novel approach to extending the linear range of bioanalytical systems and biosensors by utilizing two enzymes with different kinetic responses to the input chemical as their substrate. Data for the flow-injection amperometric system devised for detection of lysine based on the function of L-Lysine-alpha-Oxidase and Lysine-2-monooxygenase are analyzed. Lysine is a homotropic substrate for the latter enzyme. We elucidate the mechanism for extending the linear response range and develop optimization techniques for future applications of such systems.

Vladimir Privman; Oleksandr Zavalov; Aleksandr Simonian

2013-05-25T23:59:59.000Z

418

Magnetic levitation configuration incorporating levitation, guidance and linear synchronous motor  

DOE Patents (OSTI)

A propulsion and suspension system for an inductive repulsion type magnetically levitated vehicle which is propelled and suspended by a system which includes propulsion windings which form a linear synchronous motor and conductive guideways, adjacent to the propulsion windings, where both combine to partially encircling the vehicle-borne superconducting magnets. A three phase power source is used with the linear synchronous motor to produce a traveling magnetic wave which in conjunction with the magnets propel the vehicle. The conductive guideway combines with the superconducting magnets to provide for vehicle levitation. 3 figures.

Coffey, H.T.

1993-10-19T23:59:59.000Z

419

Application of linear programming redispatch technique to dynamic generation allocation  

SciTech Connect

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

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

1990-02-01T23:59:59.000Z

420

Nonlinear Analysis of a Two DOF Piecewise Linear Aeroelastic System  

E-Print Network (OSTI)

.37) For the purpose of numerical simulations the system is presented in the following first order from 1 2 3 4, , ,x y x y x x? ?? ?? ? ? ? (2.38) 2 3eff x x? ? ? ? (2.39) 1 2 2 2 1 2 1 2 3 4 2 4 3 4 4 3 ( ) ( ) l eff l eff x x x p x x p C x x... x p x p x C ? ? ? ? ? ? ? ? ? ? ? ? ? ? (2.40) 18 2.2.2 The piecewise linear aerodynamic model Applying the same scales to the piecewise linear model and substituting into the equations of motion, the following set...

Elgohary, Tarek Adel Abdelsalam

2011-10-21T23:59:59.000Z

Note: This page contains sample records for the topic "trough linear fresnel" 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

Linear non-autonomous Cauchy problems and evolution semigroups  

E-Print Network (OSTI)

The paper is devoted to the problem of existence of propagators for an abstract linear non-autonomous evolution Cauchy problem of hyperbolic type in separable Banach spaces. The problem is solved using the so-called evolution semigroup approach which reduces the existence problem for propagators to a perturbation problem of semigroup generators. The results are specified to abstract linear non-autonomous evolution equations in Hilbert spaces where the assumption is made that the domains of the quadratic forms associated with the generators are independent of time. Finally, these results are applied to time-dependent Schr\\"odinger operators with moving point interactions in 1D.

Hagen Neidhardt; Valentin A. Zagrebnov

2007-11-02T23:59:59.000Z

422

Nuclear fusion control-oriented plasma current linear models  

Science Journals Connector (OSTI)

The control of plasma in nuclear fusion has been revealed as a promising application of Control Engineering, with increasing interest in the control community during last years. In this paper it is developed a control-oriented linear model for the control ...

Aitor J. Garrido; Izaskun Garrido; M. Goretti Sevillano; Mikel Alberdi; Modesto Amundarain; Oscar Barambones; Manuel De La Sen

2010-07-01T23:59:59.000Z

423

On decomposition and piecewise linearization in petroleum production  

E-Print Network (OSTI)

On decomposition and piecewise linearization in petroleum production optimization Vidar Gunnerud operations of large and complex petroleum assets is not a trivial task. There are numerous decisions- port. In petroleum assets with rate dependent gas to oil, or water to oil ratios, and with limited gas

Foss, Bjarne A.

424

Design and sizing of electromagnetic linear actuators for valve applications  

E-Print Network (OSTI)

, a description of the design and sizing of variable reluctance or permanent magnet devices is given. The main, concerning magnetic saturation, the section of this shaft will have to be greater than a minimal value. So qualities of each structure are enhanced. Keywords: Linear motion actuator, variable reluctance, permanent

Paris-Sud XI, Université de

425

Simplified higher-order Boussinesq equations I. Linear simplifications  

E-Print Network (OSTI)

Simplified higher-order Boussinesq equations I. Linear simplifications Andrew B. Kennedy a,*, James derive and test simplified higher-order Boussinesq equations, i.e., higher-order Boussinesq equations Science B.V. All rights reserved. Keywords: Boussinesq equations; Dispersion; Shoaling 1. Introduction

Kirby, James T.

426

Generation of atomic entangled states using linear optics  

E-Print Network (OSTI)

In this paper, we propose a novel scheme that can generate two-atom maximally entangled states from pure product states and mixed states using linear optics. Because the scheme can generate pure maximally entangled states from mixed states, we denote it as purification-like generation scheme.

Zhuo-Liang Cao; Ming Yang

2003-11-13T23:59:59.000Z

427

Representing the space of linear programs as a Grassmannian  

E-Print Network (OSTI)

Feb 22, 2006 ... We will show that there are only a finite number of stable points. Thus ... linear programs as the space of projection matrices. ..... QA[x]2AT QT ...... There are many questions related to the implementation and efficiency of these ...

2006-03-01T23:59:59.000Z

428

Modeling of a detonation driven, linear electric generator facility  

E-Print Network (OSTI)

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

Texas at Arlington, University of

429

Resonances in long time integration of semi linear Hamiltonian PDEs  

E-Print Network (OSTI)

Resonances in long time integration of semi linear Hamiltonian PDEs Erwan Faou1 and Beno^it Gr´ebert2 1 INRIA & ENS Cachan Bretagne, Avenue Robert Schumann F-35170 Bruz, France. email: Erwan approxima- tion methods cannot in general avoid resonances issues, and we give numerical examples

Paris-Sud XI, Université de

430

Linear dichroism and resonant photoemission in Gd 011  

SciTech Connect

Magnetic Linear Dichroism in Angular Distributions (MLDAD) from Photoelectron Emission was used to probe the nature of Resonant Photoemission. Gd 5p and Gd 4f emission were investigated. Using novel theoretical simulations, we were able to show that temporal matching is a requirement for ``True`` Resonant Photoemission, where the Resonant Photoemission retains the characteristics of Photoelectron Emission.

Mishra, S.R.; Cummins, T.R.; Gammon, W.J.; van der Laan, G.; Goodman, K.W.; Tobin, J.G.

1998-05-13T23:59:59.000Z

431

Resonances in long time integration of semi linear Hamiltonian PDEs  

E-Print Network (OSTI)

Resonances in long time integration of semi linear Hamiltonian PDEs Erwan Faou1 and Beno^it Gr´ebert2 1 INRIA & ENS Cachan Bretagne, Avenue Robert Schumann F-35170 Bruz, France. email: Erwan in general avoid resonances issues, and we give numerical examples of pathological behavior for the midpoint

Faou, Erwan

432

Coded Adaptive Linear Precoded Discrete Multitone Over PLC Channel  

E-Print Network (OSTI)

Coded Adaptive Linear Precoded Discrete Multitone Over PLC Channel Fahad Syed Muhammmad, Jean- DMT system is presented in the power line communication (PLC) context with a loading algorithm which spectral density constraint. Using a multipath model of PLC channel, it is shown that the proposed coded

Boyer, Edmond

433

Lattice Boltzmann method for linear oscillatory noncontinuum flows  

Science Journals Connector (OSTI)

Oscillatory gas flows are commonly generated by micro- and nanoelectromechanical systems. Due to their small size and high operating frequencies, these devices often produce noncontinuum gas flows. Theoretical analysis of such flows requires solution of the unsteady Boltzmann equation, which can present a formidable challenge. In this article, we explore the applicability of the lattice Boltzmann (LB) method to such linear oscillatory noncontinuum flows; this method is derived from the linearized Boltzmann Bhatnagar-Gross-Krook (BGK) equation. We formulate four linearized LB models in the frequency domain, based on Gaussian-Hermite quadratures of different algebraic precision (AP). The performance of each model is assessed by comparison to high-accuracy numerical solutions to the linearized Boltzmann-BGK equation for oscillatory Couette flow. The numerical results demonstrate that high even-order LB models provide superior performance over the greatest noncontinuum range. Our results also highlight intrinsic deficiencies in the current LB framework, which is incapable of capturing noncontinuum behavior at high oscillation frequencies, regardless of quadrature AP and the Knudsen number.

Yong Shi; Ying Wan Yap; John E. Sader

2014-03-12T23:59:59.000Z

434

Multi-Rank Adaptive Beamforming with Linear and Quadratic Constraints  

E-Print Network (OSTI)

Multi-Rank Adaptive Beamforming with Linear and Quadratic Constraints Henry Cox, Ali Pezeshki the signal is either rank-one of unknown orientation in a subspace or multi-rank. Only signal. The unifying component is the multi-rank MVDR beamformer followed by post processing. Detection statistics

Pezeshki, Ali

435

Linear and nonlinear resonance of water waves near periodic structures  

E-Print Network (OSTI)

In the first part of this thesis, we present a nonlinear theory for the excitation of trapped wave around a circular cylinder mounted at the center of a channel. It is well-known that near an infinite linear array of ...

Li, Yile, 1973-

2006-01-01T23:59:59.000Z

436

MATH 1503 Introduction to Linear Algebra Notes on MATLAB  

E-Print Network (OSTI)

1 MATH 1503 Introduction to Linear Algebra Notes on MATLAB MATLAB (`MATrix LABoratory as a programming language. MATLAB is available to UNB students on the University's Novell network ­ click on the `More Applications' icon, then click on the `MATLAB' icon. More than one release of MATLAB may

Monson, Barry

437

Resurgence, Stokes phenomenon and alien derivatives for levelone linear  

E-Print Network (OSTI)

Resurgence, Stokes phenomenon and alien derivatives for level­one linear di#erential systems. Mich of alien derivatives. We make explicit the Stokes­Ramis matrices as functions of the connection constants, summability, resurgence, alien derivatives. AMS classification: 34M03, 34M30, 34M35, 34M40. 1 #12; Loday

438

-okfl ^ ORNL/CON-172 Linear Harmonic Analysis of Free-  

E-Print Network (OSTI)

Stirling Engines N. C. J. Chen F. P. Griffin OPERATED BY MARTIN MARIETTA ENERGY SYSTEMS, INC/dynamic problem that is associated with a free-piston Stirling engine (FPSE). The governing equations. #12;ORNL/CON-172 Engineering Technology Division* LINEAR HARMONIC ANALYSIS OF FREE-PISTON STIRLING

Oak Ridge National Laboratory

439

LINEAR COLLIDER FINAL DOUBLET CONSIDERATIONS: ATF2 VIBRATION MEASUREMENTS*  

E-Print Network (OSTI)

LINEAR COLLIDER FINAL DOUBLET CONSIDERATIONS: ATF2 VIBRATION MEASUREMENTS* B. Bolzon# , N. Geffroy to measure medium frequency vibrations in vertical axis. First, ground motion was measured for 72 hours vibrations (with their supports) were measured to evaluate their rigidity. The correlation of QD0 and QF1

Paris-Sud XI, Université de

440

A bayesian mixture model with linear regression mixing proportions  

Science Journals Connector (OSTI)

Classic mixture models assume that the prevalence of the various mixture components is fixed and does not vary over time. This presents problems for applications where the goal is to learn how complex data distributions evolve. We develop models and ... Keywords: bayesian mixture model, gibbs sampler, linear regression, mixing proportion

Xiuyao Song; Chris Jermaine; Sanjay Ranka; John Gums

2008-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "trough linear fresnel" 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

A feature selection method using improved regularized linear discriminant analysis  

Science Journals Connector (OSTI)

Investigation of genes, using data analysis and computer-based methods, has gained widespread attention in solving human cancer classification problem. DNA microarray gene expression datasets are readily utilized for this purpose. In this paper, we propose ... Keywords: Classification accuracy, Feature/gene selection, Linear discriminant analysis (LDA), Regularized LDA

Alok Sharma, Kuldip K. Paliwal, Seiya Imoto, Satoru Miyano

2014-04-01T23:59:59.000Z

442

Non-linear Langmuir waves in a warm quantum plasma  

SciTech Connect

A non-linear differential equation describing the Langmuir waves in a warm quantum electron-ion plasma has been derived. Its numerical solutions of the equation show that ordinary electronic oscillations, similar to the classical oscillations, occur along with small-scale quantum Langmuir oscillations induced by the Bohm quantum force.

Dubinov, Alexander E., E-mail: dubinov-ae@yandex.ru; Kitaev, Ilya N. [Russian Federal Nuclear Center—All-Russia Scientific and Research Institute of Experimental Physics (RFNC-VNIIEF), 37 Mira Ave., Nizhny Novgorod region, Sarov 607188 (Russian Federation); Sarov State Institute of Physics and Technology (SarFTI), National Research Nuclear University MEPhI, 607186 Sarov, Nizhny Novgorod region (Russian Federation)

2014-10-15T23:59:59.000Z

443

Position sensor for linear synchronous motors employing halbach arrays  

DOE Patents (OSTI)

A position sensor suitable for use in linear synchronous motor (LSM) drive systems employing Halbach arrays to create their magnetic fields is described. The system has several advantages over previously employed ones, especially in its simplicity and its freedom from being affected by weather conditions, accumulated dirt, or electrical interference from the LSM system itself.

Post, Richard Freeman

2014-12-23T23:59:59.000Z

444

State Control Design for Linear Systems with Distributed Time Delays  

E-Print Network (OSTI)

State Control Design for Linear Systems with Distributed Time Delays Daniel Gontkovic and Róbert with distributed time delays. Using an extended form of the Lyapunov- Krasovskii functional the controller design involving distributed time delays is a problem of large practical interest where intensive activity are done

Paris-Sud XI, Université de

445

-density set by salinity -non-linear equation of state  

E-Print Network (OSTI)

COLD - density set by salinity - non-linear equation of state SEA-ICE - forcings - insulator Evaporation-Precipitation - order 2000 km3/yr freshwater Ice Export through the Fram Strait - equivalent Arctic Sea-Ice Climatology http://nsidc.org MINIMUM (September) MAXIMUM (February) #12;Arctic Surface Air

Washington at Seattle, University of

446

Linear Resistivity from Non-Abelian Black Holes  

E-Print Network (OSTI)

Starting with the holographic p-wave superconductor, we show how to obtain a finite DC conductivity through a non-abelian gauge transformation. The translational symmetry is preserved. We obtain phenomenological similarities with high temperature cuprate superconductors. Our results suggest that a lattice or impurities are not essential to produce a finite DC resistivity with a linear temperature dependence.

Herzog, Christopher P; Vaz, Ricardo

2014-01-01T23:59:59.000Z

447

Using Statistical Transformations to Improve Compression for Linear Decompressors  

E-Print Network (OSTI)

in the test data to reduce the number of specified bits that need to be produced by the linear decompressor described in this paper. 1. Introduction Test data compression provides a means to reduce test costs by reducing tester storage, test time, and test data bandwidth requirements. Compressing the output response

Touba, Nur A.

448

Capacity expansion analysis in a chemical plant using linear programming  

Science Journals Connector (OSTI)

An analysis of the fuel additive production process of a US mid-western chemical manufacturer is described. Material balance constraints for each potential bottleneck of the manufacturing process are included as part of a linear programming model. Several capacity expansion scenarios are evaluated. The optimal way of modifying and expanding manufacturing capacity to meet forecast demand is determined.

Kenneth H. Myers; Reuven R. Levary

1996-01-01T23:59:59.000Z

449

On the non-linear evolution of sand dunes  

Science Journals Connector (OSTI)

......University of Khartoum, Khartoum, Sudan International Centre for Theoretical...University of Khartoum, Khartoum, Sudan. Adopting a multiple scale...A. , 1977. Non-linear thermal convection in an elasticoviscous...University ofKhartoum, Khartoum, Sudan M. H. A. Hassan International......

I. A. Eltayeb; M. H. A. Hassan

1981-04-01T23:59:59.000Z

450

Chaos Pass Filter: Linear Response of Synchronized Chaotic Systems  

E-Print Network (OSTI)

The linear response of synchronized time-delayed chaotic systems to small external perturbations, i.e., the phenomenon of chaos pass filter, is investigated for iterated maps. The distribution of distances, i.e., the deviations between two synchronized chaotic units due to external perturbations on the transfered signal, is used as a measure of the linear response. It is calculated numerically and, for some special cases, analytically. Depending on the model parameters this distribution has power law tails in the region of synchronization leading to diverging moments of distances. This is a consequence of multiplicative and additive noise in the corresponding linear equations due to chaos and external perturbations. The linear response can also be quantified by the bit error rate of a transmitted binary message which perturbs the synchronized system. The bit error rate is given by an integral over the distribution of distances and is calculated analytically and numerically. It displays a complex nonmonotonic behavior in the region of synchronization. For special cases the distribution of distances has a fractal structure leading to a devil's staircase for the bit error rate as a function of coupling strength. The response to small harmonic perturbations shows resonances related to coupling and feedback delay times. A bi-directionally coupled chain of three units can completely filtered out the perturbation. Thus the second moment and the bit error rate become zero.

Steffen Zeeb; Johannes Kestler; Ido Kanter; Wolfgang Kinzel

2013-01-29T23:59:59.000Z

451

Compositional analysis of floating-point linear numerical filters  

E-Print Network (OSTI)

Compositional analysis of floating-point linear numerical filters David Monniaux CNRS / Laboratoire filters are used in a variety of applications (sound treatment, control/command, etc.), implemented experience with the Astr´ee static analyzer [3] is that precise analysis of the numerical behavior

Monniaux, David

452

LINEAR FEEDBACK CONTROL OF TRANSITION IN SHEAR FLOWS  

E-Print Network (OSTI)

-100 44 Stockholm, Sweden, 2The Swedish Defense Research Agency (FOI), SE-172 90, Stockholm Sweden 3 are being developed (see Bewley, 2001, Kim, 2003). A powerful theory for linear feedback control on the control effort. The optimal feedback gains L and K can be computed independently for each wave number pair

Hoepffner, Jérôme

453

Optimal subgradient algorithms with application to large-scale linear ...  

E-Print Network (OSTI)

Since problems of the form (5) mostly include high-dimensional data, optimization schemes should avoid ..... applying linear mappings, the complexity of an algorithm can be measured by counting the number of ..... Two standard choices of discrete ...... The interface to each subprogram in the package is fully documented in.

2014-05-26T23:59:59.000Z

454

The Evolutionary Reduction Principle for Linear Variation in Genetic Transmission  

E-Print Network (OSTI)

The Evolutionary Reduction Principle for Linear Variation in Genetic Transmission Lee Altenberg of modifier gene models, in which a neutral gene is posited to control the transmission of other genes under principle": in a population near equilibrium, a new modifier allele that scales equally all transition

Altenberg, Lee

455

Time-varying Linear Regression with Total Variation Regularization  

E-Print Network (OSTI)

a sparse set of parameters describing the energy consumption of a refrigerator and enables us to predict in the time series. Our motivating example is the problem of modeling and predicting energy consumption learn- ing the parameters of multiple linear systems as well as the change points that describe when

Murphy, Robert F.

456

Tunneling control using classical non-linear oscillator  

SciTech Connect

A quantum particle is placed in symmetric double well potential which is coupled to a classical non-linear oscillator via a coupling function. With different spatial symmetry of the coupling and under various controlling fashions, the tunneling of the quantum particle can be enhanced or suppressed, or totally destroyed.

Kar, Susmita [Department of Physical Chemistry, Indian Association for the Cultivation of Science, Kolkata -700032 (India); Bhattacharyya, S. P., E-mail: pcspb@chem.iitb.ac.in [Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai- 400076 (India)

2014-04-24T23:59:59.000Z

457

Assessing the reliability of linear dynamic transformer thermal modelling  

E-Print Network (OSTI)

Assessing the reliability of linear dynamic transformer thermal modelling X. Mao, D.J. Tylavsky and G.A. McCulla Abstract: Improving the utilisation of transformers requires that the hot-spot and top. An alternative method for assessing transformer model reliability is provided. 1 Introduction The maximally

458

Statistics of Entropy Production in Linearized Stochastic System  

E-Print Network (OSTI)

We consider a wide class of linear stochastic problems driven off the equilibrium by a multiplicative asymmetric force. The force brakes detailed balance, maintained otherwise, thus producing entropy. The large deviation function of the entropy production in the system is calculated explicitly. The general result is illustrated using an example of a polymer immersed in a gradient flow and subject to thermal fluctuations.

K. Turitsyn; M. Chertkov; V. Y. Chernyak; A. Puliafito

2007-02-20T23:59:59.000Z

459

The Linear Theory of Free Vibrations of a Suspended Cable  

Science Journals Connector (OSTI)

...Theory of Free Vibrations of a Suspended Cable H. M. Irvine T. K. Caughey A linear...free vibrations of a uniform suspended cable in which the ratio of sag to span is about...parameter which allows for the effects of cable geometry and elasticity. The results of...

1974-01-01T23:59:59.000Z

460

An extension of the linear delta expansion to superspace  

SciTech Connect

We introduce and discuss the method of linear delta expansion for the calculation of effective potentials in superspace, by adopting the improved version of the super-Feynman rules. Calculations are carried out up to two loops and an expression for the optimized Kaehler potential in the Wess-Zumino model is worked out.

Abdalla, M. C. B.; Senise, Carlos R. Jr. [Instituto de Fisica Teorica, UNESP, Rua Pamplona 145, Bela Vista, Sao Paulo, SP, 01405-900 (Brazil); Helayeel-Neto, J. A. [Centro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud 150, Urca, Rio de Janeiro, RJ, 22290-180 (Brazil); Nedel, Daniel L. [Universidade Federal do Pampa, Rua Carlos Barbosa S/N, Bairro Getulio Vargas, 96412-420, Bage, RS (Brazil)

2008-06-15T23:59:59.000Z

Note: This page contains sample records for the topic "trough linear fresnel" 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

Energy 101: Concentrating Solar Power | Department of Energy  

Energy Savers (EERE)

From towers to dishes to linear mirrors to troughs, concentrating solar power (CSP) technologies reflect and collect solar heat to generate electricity. A single CSP...

462

FACIAL STRUCTURES FOR UNITAL POSITIVE LINEAR MAPS IN THE TWO DIMENSIONAL MATRIX ALGEBRA  

E-Print Network (OSTI)

positive linear maps between the 2 Ã? 2 matrix algebras. 1. Introduction After Stinespring's paper [10

Kye, Seung-Hyeok

463

Non-linear Seismic Soil Structure Interaction Method for Developing Nonlinear Seismic SSI  

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

Linear Seismic Soil Structure Interaction (SSI) Linear Seismic Soil Structure Interaction (SSI) Method for Developing Non-Linear Seismic SSI Analysis Techniques Justin Coleman, P.E. October 25th, 2011 E102003020BDS Presentation Outline  Purpose of Presentation  Linear versus Non-Linear Seismic SSI  Non-Linear seismic Soil Structure Interaction (NLSSI) Studies  The NLSSI Introduction  Non-Linearity in Seismic SSI Analysis  Commercial Software Elements  Commercial Software Non-Linear Constitutive Models  Non-Linear Seismic SSI Damping  Demonstration of Time Domain 2D Model  NLSSI Validation Approach  NLSSI Implementation  Need For NLSSI  Conclusions E102003020BDS Purpose of Presentation  The purpose of the presentation is to establish the need for using non-linear analysis

464

Suppression of drift waves in a linear magnetized plasma column  

SciTech Connect

In magnetically confined fusion plasmas, drift wave driven turbulence can lead to enhanced particle transport from the plasma. Because of this, a significant research emphasis has been placed on the suppression of drift waves in the plasma edge. However, the combination of the toroidal geometry and short plasma lifetimes can make it difficult to fully characterize the properties of these instabilities. Because linear magnetized plasma devices offer a combination of simpler geometry and steady state plasma generation, it is possible to perform detailed studies of many types of plasma instabilities-including drift waves. This paper reports on a recent experiment in which low frequency instabilities ({omega} {<=} {omega}{sub ci}) in the Auburn Linear EXperiment for Instability Studies plasma device were characterized as drift waves and through changes in the parallel current, it is shown that it is possible to suppress these instabilities.

DuBois, A. M.; Eadon, A. C.; Thomas, E. Jr. [Physics Department, Auburn University, Auburn, Alabama 36849 (United States)

2012-07-15T23:59:59.000Z

465

On Borwein-Wiersma Decompositions of Monotone Linear Relations  

E-Print Network (OSTI)

Monotone operators are of basic importance in optimization as they generalize simultaneously subdifferential operators of convex functions and positive semidefinite (not necessarily symmetric) matrices. In 1970, Asplund studied the additive decomposition of a maximal monotone operator as the sum of a subdifferential operator and an "irreducible" monotone operator. In 2007, Borwein and Wiersma [SIAM J. Optim. 18 (2007), pp. 946-960] introduced another additive decomposition, where the maximal monotone operator is written as the sum of a subdifferential operator and a "skew" monotone operator. Both decompositions are variants of the well-known additive decomposition of a matrix via its symmetric and skew part. This paper presents a detailed study of the Borwein-Wiersma decomposition of a maximal monotone linear relation. We give sufficient conditions and characterizations for a maximal monotone linear relation to be Borwein-Wiersma decomposable, and show that Borwein-Wiersma decomposability implies Asplund deco...

Bauschke, Heinz H; Yao, Liangjin

2009-01-01T23:59:59.000Z

466

Exponential cosmological redshift in a linearly expanding universe  

E-Print Network (OSTI)

The first principles analysis of the radiation by an arbitrary source in a flat Friedmann-Robertson-Walker space-time is presented. The obtained analytical solution explicitly shows that the cosmological redshift is not of kinematic origin and that the source and the observer may be regarded as being at rest with respect to eachother at all times. At the same time the effect of the time-variation of the metric on the propagation of light appears to be underestimated in the standard cosmology. The cosmological redshift caused by the linear time-variation of the metric turns out to be an exponential rather than linear function of the well-defined spatial distance and the apparent brightness of the source contains an even stronger exponential decay factor.

Neil V. Budko

2009-07-03T23:59:59.000Z

467

Generalized linear Boltzmann equations for particle transport in polycrystals  

E-Print Network (OSTI)

The linear Boltzmann equation describes the macroscopic transport of a gas of non-interacting point particles in low-density matter. It has wide-ranging applications, including neutron transport, radiative transfer, semiconductors and ocean wave scattering. Recent research shows that the equation fails in highly-correlated media, where the distribution of free path lengths is non-exponential. We investigate this phenomenon in the case of polycrystals whose typical grain size is comparable to the mean free path length. Our principal result is a new generalized linear Boltzmann equation that captures the long-range memory effects in this setting. A key feature is that the distribution of free path lengths has an exponential decay rate, as opposed to a power-law distribution observed in a single crystal.

Jens Marklof; Andreas Strömbergsson

2015-02-13T23:59:59.000Z

468

3D gravity and non-linear cosmology  

E-Print Network (OSTI)

By the inclusion of an additional term, non-linear in the scalar curvature $R$, it is tested if dark energy could rise as a geometrical effect in 3D gravitational formulations. We investigate a cosmological fluid obeying a non-polytropic equation of state (the van der Waals equation) that is used to construct the energy-momentum tensor of the sources, representing the hypothetical inflaton in gravitational interaction with a matter contribution. Following the evolution in time of the scale factor, its acceleration, and the energy densities of constituents it is possible to construct the description of an inflationary 3D universe, followed by a matter dominated era. For later times it is verified that, under certain conditions, the non-linear term in $R$ can generate the old 3D universe in accelerated expansion, where the ordinary matter is represented by the barotropic limit of the van der Waals constituent.

F. P. Devecchi; M. L. Froehlich

2005-10-11T23:59:59.000Z

469

Congruences on bicyclic extensions of a linearly ordered group  

E-Print Network (OSTI)

In the paper we study inverse semigroups $\\mathscr{B}(G)$, $\\mathscr{B}^+(G)$, $\\bar{\\mathscr{B}}(G)$ and $\\bar{\\mathscr{B}}\\,^+(G)$ which are generated by partial monotone injective translations of a positive cone of a linearly ordered group $G$. We describe Green's relations on the semigroups $\\mathscr{B}(G)$, $\\mathscr{B}^+(G)$, $\\bar{\\mathscr{B}}(G)$ and $\\bar{\\mathscr{B}}\\,^+(G)$, their bands and show that they are simple, and moreover the semigroups $\\mathscr{B}(G)$ and $\\mathscr{B}^+(G)$ are bisimple. We show that for a commutative linearly ordered group $G$ all non-trivial congruences on the semigroup $\\mathscr{B}(G)$ (and $\\mathscr{B}^+(G)$) are group congruences if and only if the group $G$ is archimedean. Also we describe the structure of group congruences on the semigroups $\\mathscr{B}(G)$, $\\mathscr{B}^+(G)$, $\\bar{\\mathscr{B}}(G)$ and $\\bar{\\mathscr{B}}\\,^+(G)$.

Gutik, Oleg; Pavlyk, Kateryna

2011-01-01T23:59:59.000Z

470

Linear induction accelerator and pulse forming networks therefor  

DOE Patents (OSTI)

A linear induction accelerator includes a plurality of adder cavities arranged in a series and provided in a structure which is evacuated so that a vacuum inductance is provided between each adder cavity and the structure. An energy storage system for the adder cavities includes a pulsed current source and a respective plurality of bipolar converting networks connected thereto. The bipolar high-voltage, high-repetition-rate square pulse train sets and resets the cavities.

Buttram, Malcolm T. (Sandia Park, NM); Ginn, Jerry W. (Albuquerque, NM)

1989-01-01T23:59:59.000Z

471

Linearity of Climate Response to Increases in Black Carbon Aerosols  

SciTech Connect

The impact of absorbing aerosols on global climate are not completely understood. Here, we present results of idealized experiments conducted with the Community Atmosphere Model (CAM4) coupled to a slab ocean model (CAM4-SOM) to simulate the climate response to increases in tropospheric black carbon aerosols (BC) by direct and semi-direct effects. CAM4-SOM was forced with 0, 1x, 2x, 5x and 10x an estimate of the present day concentration of BC while maintaining their estimated present day global spatial and vertical distribution. The top of the atmosphere (TOA) radiative forcing of BC in these experiments is positive (warming) and increases linearly as the BC burden increases. The total semi-direct effect for the 1x experiment is positive but becomes increasingly negative for higher BC concentrations. The global average surface temperature response is found to be a linear function of the TOA radiative forcing. The climate sensitivity to BC from these experiments is estimated to be 0.42 K $\\textnormal W^{-1} m^{2}$ when the semi-direct effects are accounted for and 0.22 K $\\textnormal W^{-1} m^{2}$ with only the direct effects considered. Global average precipitation decreases linearly as BC increases, with a precipitation sensitivity to atmospheric absorption of 0.4 $\\%$ $\\textnormal W^{-1} \\textnormal m^{2}$ . The hemispheric asymmetry of BC also causes an increase in southward cross-equatorial heat transport and a resulting northward shift of the inter-tropical convergence zone in the simulations at a rate of 4$^{\\circ}$N $\\textnormal PW^{-1}$. Global average mid- and high-level clouds decrease, whereas the low-level clouds increase linearly with BC. The increase in marine stratocumulus cloud fraction over the south tropical Atlantic is caused by increased BC-induced diabatic heating of the free troposphere.

Mahajan, Salil [ORNL; Evans, Katherine J [ORNL; Hack, James J [ORNL; Truesdale, John [National Center for Atmospheric Research (NCAR)

2013-01-01T23:59:59.000Z

472

Radio-frequency quadrupole resonator for linear accelerator  

DOE Patents (OSTI)

An RFQ resonator for a linear accelerator having a reduced level of interfering modes and producing a quadrupole mode for focusing, bunching and accelerating beams of heavy charged particles, with the construction being characterized by four elongated resonating rods within a cylinder with the rods being alternately shorted and open electrically to the shell at common ends of the rods to provide an LC parallel resonant circuit when activated by a magnetic field transverse to the longitudinal axis.

Moretti, A.

1982-10-19T23:59:59.000Z

473

Exponential cosmological redshift in a linearly expanding universe  

E-Print Network (OSTI)

Analytical solution of the Maxwell equations in a flat expanding Friedmann-Robertson-Walker space-time is presented. The solution is valid for arbitrary sources and for expansion rates described by positive functions of time. The near-, intermediate-, and far-field terms are explicitly identified. It is shown that the cosmological redshift introduced by a linearly expanding space-time is an exponential function of the distance factor.

Budko, Neil V

2009-01-01T23:59:59.000Z

474

Linear feature selection and the probability of misclassification  

E-Print Network (OSTI)

) (Member) May 1974 ABSTRACT Linear Feature Selecti. on and the Probability of Misclassification. (May 1974) Louise Wilson Darcey, B. S. , University of Texas at Austin Chairman of Advisory Committee: Dr. L. F. Guseman, Jr. A classifi. cation... procedure for n-dimensional normally distributed observation vectors which belong to one of two populations is described. In particular, a computational procedure is presented for finding a lxn vector B which minimizes the probability...

Darcey, Louise Wilson

2012-06-07T23:59:59.000Z

475

A linearly constrained adaptive algorithm for seismic array processing  

E-Print Network (OSTI)

is described. The constrained IPS adaptive algorithm of Frost ( 1972) is derived from this linearly constrained LNS algorithm and compared with other algorithms. Theoretical analyses show that the constrained LMS adaptive algorithm is able to provide1 a... better than simple channel-averaging. hut in the case of the real seismic data, it takes advantage of the coher- ence feature of noise between channels to reduce the noise power. Further experiments indicate that the constrained LNS adaptive algorithm...

Byun, Bok Sub

2012-06-07T23:59:59.000Z

476

NON-LINEAR MODELING OF THE RHIC INTERACTION REGIONS.  

SciTech Connect

For RHIC's collision lattices the dominant sources of transverse non-linearities are located in the interaction regions. The field quality is available for most of the magnets in the interaction regions from the magnetic measurements, or from extrapolations of these measurements. We discuss the implementation of these measurements in the MADX models of the Blue and the Yellow rings and their impact on beam stability.

TOMAS,R.FISCHER,W.JAIN,A.LUO,Y.PILAT,F.

2004-07-05T23:59:59.000Z

477

Linear delta expansion applied to the O'Raifeartaigh model  

SciTech Connect

We reassess the method of the linear delta expansion for the calculation of effective potentials in superspace, by adopting the improved version of the super-Feynman rules in the framework of the O'Raifeartaigh model for spontaneous supersymmetry breaking. The effective potential is calculated using both the fastest apparent convergence and the principle of minimal sensitivity criteria and the consistency and efficacy of the method are checked in deriving the Coleman-Weinberg potential.

Abdalla, M. C. B.; Senise, Carlos R. Jr. [Instituto de Fisica Teorica, UNESP, Rua Pamplona 145, Bela Vista, Sao Paulo, SP, 01405-900 (Brazil); Helayeel-Neto, J. A. [Centro Brasileiro de Pesquisas Fisicas, Rua Dr. Xavier Sigaud 150, Urca, Rio de Janeiro, RJ, 22290-180 (Brazil); Nedel, Daniel L. [Universidade Federal do Pampa, Rua Carlos Barbosa S/N, Bairro Getulio Vargas, 96412-420, Bage, RS (Brazil)

2009-09-15T23:59:59.000Z

478

LINEAR SCANNING METHOD BASED ON THE SAFT COARRAY  

SciTech Connect

This work presents a method to obtain B-scan images based on linear array scanning and 2R-SAFT. Using this technique some advantages are obtained: the ultrasonic system is very simple; it avoids the grating lobes formation, characteristic in conventional SAFT; and subaperture size and focussing lens (to compensate emission-reception) can be adapted dynamically to every image point. The proposed method has been experimentally tested in the inspection of CFRP samples.

Martin, C. J.; Martinez-Graullera, O.; Romero, D.; Ullate, L. G. [Instituto de Automatica Industrial-CSIC, Carretera de Campo Real, km 0.200, La Poveda, Arganda del Rey, Madrid, E-28500 (Spain); Higuti, R. T. [UNESP-Universidade Estadual Paulista, Dep. Electrical Engineering, Av. Brasil, 56, 15385-000, Ilha Solteira, SP (Brazil)

2010-02-22T23:59:59.000Z

479

Non-linear Plasma Wake Growth of Electron Holes  

E-Print Network (OSTI)

An object's wake in a plasma with small Debye length that drifts \\emph{across} the magnetic field is subject to electrostatic electron instabilities. Such situations include, for example, the moon in the solar wind wake and probes in magnetized laboratory plasmas. The instability drive mechanism can equivalently be considered drift down the potential-energy gradient or drift up the density-gradient. The gradients arise because the plasma wake has a region of depressed density and electrostatic potential into which ions are attracted along the field. The non-linear consequences of the instability are analysed in this paper. At physical ratios of electron to ion mass, neither linear nor quasilinear treatment can explain the observation of large-amplitude perturbations that disrupt the ion streams well before they become ion-ion unstable. We show here, however, that electron holes, once formed, continue to grow, driven by the drift mechanism, and if they remain in the wake may reach a maximum non-linearly stable...

Hutchinson, I H; Zhou, C

2015-01-01T23:59:59.000Z

480

Charged relativistic fluids and non-linear electrodynamics  

E-Print Network (OSTI)

The electromagnetic fields in Maxwell's theory satisfy linear equations in the classical vacuum. This is modified in classical non-linear electrodynamic theories. To date there has been little experimental evidence that any of these modified theories are tenable. However with the advent of high-intensity lasers and powerful laboratory magnetic fields this situation may be changing. We argue that an approach involving the self-consistent relativistic motion of a smooth fluid-like distribution of matter (composed of a large number of charged or neutral particles) in an electromagnetic field offers a viable theoretical framework in which to explore the experimental consequences of non-linear electrodynamics. We construct such a model based on the theory of Born and Infeld and suggest that a simple laboratory experiment involving the propagation of light in a static magnetic field could be used to place bounds on the fundamental coupling in that theory. Such a framework has many applications including a new description of the motion of particles in modern accelerators and plasmas as well as phenomena in astrophysical contexts such as in the environment of magnetars, quasars and gamma-ray bursts.

T. Dereli; R. W. Tucker

2010-01-08T23:59:59.000Z

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


481

NEAR-INFRARED LINEAR POLARIZATION OF ULTRACOOL DWARFS  

SciTech Connect

We report on near-infrared J- and H-band linear polarimetric photometry of eight ultracool dwarfs (two late-M, five L0-L7.5, and one T2.5) with known evidence for photometric variability due to dust clouds, anomalous red infrared colors, or low-gravity atmospheres. The polarimetric data were acquired with the LIRIS instrument on the William Herschel Telescope. We also provide mid-infrared photometry in the interval 3.4-24 {mu}m for some targets obtained with Spitzer and WISE, which has allowed us to confirm the peculiar red colors of five sources in the sample. We can impose modest upper limits of 0.9% and 1.8% on the linear polarization degree for seven targets with a confidence of 99%. Only one source, 2MASS J02411151-0326587 (L0), appears to be strongly polarized (P {approx} 3%) in the J band with a significance level of P/{sigma}{sub P} {approx} 10. The likely origin of its linearly polarized light and rather red infrared colors may reside in a surrounding disk with an asymmetric distribution of grains. Given its proximity (66 {+-} 8 pc), this object becomes an excellent target for the direct detection of the disk.

Zapatero Osorio, M. R. [Centro de Astrobiologia (CSIC-INTA), Ctra. Ajalvir km 4, E-28850 Torrejon de Ardoz, Madrid (Spain); Bejar, V. J. S.; Rebolo, R.; Acosta-Pulido, J. A.; Manchado, A.; Pena Ramirez, K. [Instituto de Astrofisica de Canarias, C/. Via Lactea s/n, E-38205 La Laguna, Tenerife (Spain); Goldman, B. [Max-Planck Institut fuer Astronomie, Koenigstuhl 17, D-69117 Heidelberg (Germany); Caballero, J. A., E-mail: mosorio@cab.inta-csic.es, E-mail: vbejar@iac.es, E-mail: rrl@iac.es, E-mail: jaa@iac.es, E-mail: amt@iac.es, E-mail: karla@iac.es, E-mail: goldman@mpia.de, E-mail: caballero@cab.inta-csic.es [Centro de Astrobiologia (CSIC-INTA), P.O. Box 78, E-28691 Villanueva de la Canada, Madrid (Spain)

2011-10-10T23:59:59.000Z

482

On characterization and measurement of average solar field mirror reflectance in utility-scale concentrating solar power plants  

Science Journals Connector (OSTI)

Abstract Due to the emerging need for the development of acceptance test codes for commercial concentrating solar power (CSP) plants, an effort is made here to develop a mirror reflectance model suitable for CSP applications as well as a general procedure to measure the average mirror reflectance of a solar field. Typically, a utility-scale solar field includes hundreds of thousands of mirror panels (if not more), and their reflectance is subject to many factors, such as weather and planned washing schedule. The newly developed mirror reflectance model can be used to characterize different types of mirror materials and can be directly used to perform optical performance evaluation of solar collectors. The newly proposed procedure for average solar field reflectance measurements includes a baseline comprehensive measurement and an individual factor measurement: the former allows a comprehensive survey of mirror reflectance across the whole solar field, and the latter can provide correcting factors for selected individual factors to further improve the accuracy of the baseline measurements. A detailed test case implementing the general procedure is applied to a state-of-the-art commercial parabolic trough plant and validates the proposed mirror reflectance model and average reflectance measurement procedure. In the test case, the plant-wide reflectance measurements at a commercial utility-scale solar plant were conducted and can shed light on relevant analysis of CSP applications. The work can also be naturally applied to other types of solar plants, such as power towers and linear Fresnel plants.

Guangdong Zhu; David Kearney; Mark Mehos

2014-01-01T23:59:59.000Z

483

Device and method for imaging of non-linear and linear properties of formations surrounding a borehole  

DOE Patents (OSTI)

In some aspects of the disclosure, a method and an apparatus is disclosed for investigating material surrounding the borehole. The method includes generating a first low frequency acoustic wave within the borehole, wherein the first low frequency acoustic wave induces a linear and a nonlinear response in one or more features in the material that are substantially perpendicular to a radius of the borehole; directing a first sequence of high frequency pulses in a direction perpendicularly with respect to the longitudinal axis of the borehole into the material contemporaneously with the first acoustic wave; and receiving one or more second high frequency pulses at one or more receivers positionable in the borehole produced by an interaction between the first sequence of high frequency pulses and the one or more features undergoing linear and nonlinear elastic distortion due to the first low frequency acoustic wave to investigate the material surrounding the borehole.

Johnson, Paul A; Tencate, James A; Le Bas, Pierre-Yves; Guyer, Robert; Vu, Cung Khac; Skelt, Christopher

2013-11-05T23:59:59.000Z

484

Unexpected Angular Dependence of X-Ray Magnetic Linear Dichroism  

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

Unexpected Angular Dependence of X-Ray Magnetic Linear Dichroism Print Unexpected Angular Dependence of X-Ray Magnetic Linear Dichroism Print Using spectroscopic information for magnetometry and magnetic microscopy obviously requires detailed theoretical understanding of spectral shape and magnitude of dichroism signals. A research team at ALS Beamline 4.0.2 has now shown unambiguously that, contrary to common belief, spectral shape and magnitude of x-ray magnetic linear dichroism (XMLD) are not only determined by the relative orientation of magnetic moments and x-ray polarization, but their orientation relative to the crystallographic axes must be taken into account for accurate interpretation of XMLD data. Magnetism and X Rays The ancient Greeks and also the Chinese knew about strange and rare stones with the power to attract iron. Moreover, when freely suspended these objects pointed north-south. Throughout the past, we have used this phenomenon-magnetism-for navigation and more recently for power production and digital information storage, all while trying to explore and understand its origins. In 1986 researchers at a facility similar to the ALS observed for the first time that the absorption of x rays depends not only on the composition of a material-that is, if it contains iron, nickel, or other elements-but also on its magnetism. The effect is unique in that it allows us to distinguish which atomic species magnetism originates from and provides information about their local atomic environment-for example, whether a magnetic species is surrounded by 4 or 6 oxygen atoms. A research team at the ALS has now shown that the relationship between magnetic order and absorption of x rays is even more complex and exciting than has been assumed for the past 20 years, leading to a reassessment of previous results.

485

Unexpected Angular Dependence of X-Ray Magnetic Linear Dichroism  

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

Unexpected Angular Dependence of X-Ray Magnetic Linear Dichroism Print Unexpected Angular Dependence of X-Ray Magnetic Linear Dichroism Print Using spectroscopic information for magnetometry and magnetic microscopy obviously requires detailed theoretical understanding of spectral shape and magnitude of dichroism signals. A research team at ALS Beamline 4.0.2 has now shown unambiguously that, contrary to common belief, spectral shape and magnitude of x-ray magnetic linear dichroism (XMLD) are not only determined by the relative orientation of magnetic moments and x-ray polarization, but their orientation relative to the crystallographic axes must be taken into account for accurate interpretation of XMLD data. Magnetism and X Rays The ancient Greeks and also the Chinese knew about strange and rare stones with the power to attract iron. Moreover, when freely suspended these objects pointed north-south. Throughout the past, we have used this phenomenon-magnetism-for navigation and more recently for power production and digital information storage, all while trying to explore and understand its origins. In 1986 researchers at a facility similar to the ALS observed for the first time that the absorption of x rays depends not only on the composition of a material-that is, if it contains iron, nickel, or other elements-but also on its magnetism. The effect is unique in that it allows us to distinguish which atomic species magnetism originates from and provides information about their local atomic environment-for example, whether a magnetic species is surrounded by 4 or 6 oxygen atoms. A research team at the ALS has now shown that the relationship between magnetic order and absorption of x rays is even more complex and exciting than has been assumed for the past 20 years, leading to a reassessment of previous results.

486

Advanced Low-Cost Receivers for Parabolic Troughs  

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

radiative losses. IMPACT This technology represents significant operational and cost advances in the most trusted and broadly implemented form of CSP. In addition, it...

487

Project Profile: Advanced High Temperature Trough Collector Developmen...  

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

collector was selected for the Andasol 1 and 2 plants in Spain, the Kuraymat plant in Egypt, and early Solar Millennium commercial projects in the United States. The NTPro design...

488

Advanced Low-Cost Receivers for Parabolic Troughs (Fact Sheet)  

SciTech Connect

Norwich Technologies is one of the 2012 SunShot CSP R&D awardees for their advanced receivers. This fact sheet explains the motivation, description, and impact of the project.

Not Available

2012-09-01T23:59:59.000Z

489

Project Profile: High-Concentration, Low-Cost Parabolic Trough...  

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

aperture, while incorporating additional advancements that substantially lower installed solar field costs. For example, the reflective film surfaces are being upgraded to improve...

490

Advanced Low-Cost Receivers for Parabolic Troughs  

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

receiver designs were validated by comparing to published correlations and NREL data. Heat loss increases when vacuum fails due to convection within annulus Receiver model...

491

A new parabolic trough solar collector P. Kohlenbach1  

E-Print Network (OSTI)

oil is circulated inside the absorber tube, and transfers the heat to a ORC FP6 unit sourced from of this facility, to develop efficient new methods of capturing and harnessing solar heat for combined heat) and remote power and energy. The array is designed to drive a small Organic Rankine Cycle unit with a power

492

Linear Stability and Subcritical Turbulence in Rotating Shear Flows  

E-Print Network (OSTI)

The relation between rotating plane Couette and Taylor-Couette flows is clarified. The identity of their linear stability limits is explained by considering the effect of the Coriolis force in the rotating frame. Experimental data are used to quantify the behavior of the minimum Reynolds number for subcritical turbulence as a function of rotation and curvature. This last dependence is understood through a phenomenological analysis, which also implies that the Coriolis force reduces the efficiency of subcritical turbulent transport with respect to nonrotating flows, as observed numerically.

P. -Y. Longaretti

2003-05-28T23:59:59.000Z

493

An analytically solvable eigenvalue problem for the linear elasticity equations.  

SciTech Connect

Analytic solutions are useful for code verification. Structural vibration codes approximate solutions to the eigenvalue problem for the linear elasticity equations (Navier's equations). Unfortunately the verification method of 'manufactured solutions' does not apply to vibration problems. Verification books (for example [2]) tabulate a few of the lowest modes, but are not useful for computations of large numbers of modes. A closed form solution is presented here for all the eigenvalues and eigenfunctions for a cuboid solid with isotropic material properties. The boundary conditions correspond physically to a greased wall.

Day, David Minot; Romero, Louis Anthony

2004-07-01T23:59:59.000Z

494

Quantum Phase Transitions in a Linear Ion Trap  

E-Print Network (OSTI)

We show that the quantum phase transition of the Tavis-Cummings model can be realised in a linear ion trap of the kind proposed for quantum computation. The Tavis-Cummings model describes the interaction between a bosonic degree of freedom and a collective spin. In an ion trap, the collective spin system is a symmetrised state of the internal electronic states of N ions, while the bosonic system is the vibrational degree of freedom of the centre of mass mode for the ions.

G. J. Milburn; Paul Alsing

2000-03-01T23:59:59.000Z

495

A novel linear switched reluctance motor for railway transportation systems  

Science Journals Connector (OSTI)

This paper presents the design and realization of a new linear switched reluctance motor (LSRM) structure, especially suitable for high-speed railway systems. The new model has a double active stator configuration and provides high force for many applications with low cost. The characteristics of the LSRM are obtained by using finite element analysis (FEA) and analytical calculations. The results of the FEA and analytical calculations are presented, and compared with experimental results. In addition, a classical double-sided LSRM (DSLSRM) is modeled with the same specifications of the new motor structure and the results are compared.

Ferhat Daldaban; Nurettin Ustkoyuncu

2010-01-01T23:59:59.000Z

496

Linear Polarization of Low-Energy-Electron Bremsstrahlung  

Science Journals Connector (OSTI)

The linear polarization of bremsstrahlung from thin targets (? 50 ?g/cm2) of Al, Cu, Ag, and Au was measured for incident electron energies of 50, 75, and 100 keV. The polarization was measured as a function of photon energy at four emission angles (?=22.5?,45?,90?, and 135?). Data presented were obtained with a Compton polarimeter having a large asymmetry ratio (from 35 to 150) and high resolution. The results have been found to be in general agreement with the predictions of various bremsstrahlung calculations.

Robert W. Kuckuck and Paul J. Ebert

1973-02-01T23:59:59.000Z

497

Non-linear parent action and dual gravity  

E-Print Network (OSTI)

We give a reformulation of non-linear Einstein gravity, which contains the dual graviton together with the ordinary metric and a shift gauge field. The metric does not enter through a `kinetic' Einstein-Hilbert term, but via topological couplings, and so the theory does not lead to a doubling of degrees of freedom. The field equations take the form of first-order duality relations. We analyze the gauge symmetries and comment on their meaning with regard to the E11 proposal.

Nicolas Boulanger; Olaf Hohm

2012-04-29T23:59:59.000Z

498

Linear Response Theory for Hard and Soft Glassy Materials  

SciTech Connect

Despite qualitative differences in their underlying physics, both hard and soft glassy materials exhibit almost identical linear rheological behaviors. We show that these nearly universal properties emerge naturally in a shear-transformation-zone (STZ) theory of amorphous plasticity, extended to include a broad distribution of internal thermal-activation barriers. The principal features of this barrier distribution are predicted by nonequilibrium, effective-temperature thermodynamics. Our theoretical loss modulus G{double_prime}({omega}) has a peak at the {alpha} relaxation rate, and a power law decay of the form {omega}{sup -{zeta}} for higher frequencies, in quantitative agreement with experimental data.

Langer, J. [University of California, Santa Barbara; Bouchbinder, Eran [Weizmann Institute of Science, Rehovot, Israel

2011-01-01T23:59:59.000Z

499

Entropy Production in Non-Linear, Thermally Driven Hamiltonian Systems  

E-Print Network (OSTI)

We consider a finite chain of non-linear oscillators coupled at its ends to two infinite heat baths which are at different temperatures. Using our earlier results about the existence of a stationary state, we show rigorously that for arbitrary temperature differences and arbitrary couplings, such a system has a unique stationary state. (This extends our earlier results for small temperature differences.) In all these cases, any initial state will converge (at an unknown rate) to the stationary state. We show that this stationary state continually produces entropy. The rate of entropy production is strictly negative when the temperatures are unequal and is proportional to the mean energy flux through the system.

Jean-Pierre Eckmann; Claude-Alain Pillet; Luc Rey-Bellet

1998-10-30T23:59:59.000Z

500

Electromagnetic field quantization in a linear dielectric medium  

E-Print Network (OSTI)

By modeling a dielectric medium with two independent reservoirs, i.e., electric and magnetic reservoirs, the electromagnetic field is quantized in a linear dielectric medium consistently. A Hamiltonian is proposed from which using the Heisenberg equations, not only the Maxwell equations but also the structural equations can be obtained. Using the Laplace transformation, the wave equation for the electromagnetic vector potential is solved in the case of a homogeneous dielectric medium. Some examples are considered showing the applicability of the model to both absorptive and nonabsorptive dielectrics.

F. Kheirandish; M. Amooshahi

2005-11-13T23:59:59.000Z