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1

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

2

Electrolysis – High Temperature – Hydrogen  

INL has developed a high-temperature process the utilizes solid oxide fuel cells that are operated in the electrolytic mode. The first process includes combining a high-temperature heat source (e.g. nuclear reactor) with a hydrogen production facility ...

3

High temperature sensor  

DOE Patents (OSTI)

A high temperature sensor includes a pair of electrical conductors separated by a mass of electrical insulating material. The insulating material has a measurable resistivity within the sensor that changes in relation to the temperature of the insulating material within a high temperature range (1,000 to 2,000 K.). When required, the sensor can be encased within a ceramic protective coating.

Tokarz, Richard D. (West Richland, WA)

1982-01-01T23:59:59.000Z

4

High Temperature Superconductors: From Delivery to Applications (Presentation from 2011 Ernest Orlando Lawrence Award-winner, Dr. Amit Goyal, and including introduction by Energy Secretary, Dr. Steven Chu)  

Science Conference Proceedings (OSTI)

Dr. Amit Goyal, a high temperature superconductivity (HTS) researcher at Oak Ridge National Laboratory, was named a 2011 winner of the Department of Energy's Ernest Orlando Lawrence Award honoring U.S. scientists and engineers for exceptional contributions in research and development supporting DOE and its mission. Winner of the award in the inaugural category of Energy Science and Innovation, Dr. Goyal was cited for his work in 'pioneering research and transformative contributions to the field of applied high temperature superconductivity, including fundamental materials science advances and technical innovations enabling large-scale applications of these novel materials.' Following his basic research in grain-to-grain supercurrent transport, Dr. Goyal focused his energy in transitioning this fundamental understanding into cutting-edge technologies. Under OE sponsorship, Dr. Goyal co-invented the Rolling Assisted Bi-Axially Textured Substrate technology (RABiTS) that is used as a substrate for second generation HTS wires. OE support also led to the invention of Structural Single Crystal Faceted Fiber Substrate (SSIFFS) and the 3-D Self Assembly of Nanodot Columns. These inventions and associated R&D resulted in 7 R&D 100 Awards including the 2010 R&D Magazine's Innovator of the Year Award, 3 Federal Laboratory Consortium Excellence in Technology Transfer National Awards, a DOE Energy100 Award and many others. As a world authority on HTS materials, Dr. Goyal has presented OE-sponsored results in more than 150 invited talks, co-authored more than 350 papers and is a fellow of 7 professional societies.

Goyal, Amit (Oak Ridge National Laboratory)

2012-05-22T23:59:59.000Z

5

High-temperature sensor  

DOE Patents (OSTI)

A high temperature sensor is described which includes a pair of electrical conductors separated by a mass of electrical insulating material. The insulating material has a measurable resistivity within the sensor that changes in relation to the temperature of the insulating material within a high temperature range (1000 to 2000/sup 0/K). When required, the sensor can be encased within a ceramic protective coating.

Not Available

1981-01-29T23:59:59.000Z

6

High Temperatures & Electricity Demand  

E-Print Network (OSTI)

High Temperatures & Electricity Demand An Assessment of Supply Adequacy in California Trends.......................................................................................................1 HIGH TEMPERATURES AND ELECTRICITY DEMAND.....................................................................................................................7 SECTION I: HIGH TEMPERATURES AND ELECTRICITY DEMAND ..........................9 BACKGROUND

7

Parabolic Scaling and Curvelets Beyond Parabolic Scaling  

E-Print Network (OSTI)

Parabolic Scaling and Curvelets Beyond Parabolic Scaling Cubic Scaling for Caustics and Tangential on Imaging Science Hart F. Smith Cubic Scaling for Caustics and Tangential Reflections #12;Parabolic Scaling and Curvelets Beyond Parabolic Scaling The Second Dyadic Decomposition Wave-Evolution of Curvelets Second Dyadic

Smith, Hart F.

8

Parabolic Molecules Philipp Grohs and Gitta Kutyniok  

E-Print Network (OSTI)

Parabolic Molecules Philipp Grohs and Gitta Kutyniok June 9, 2012 Abstract Anisotropic decompositions using representation systems based on parabolic scaling such as curve- lets or shearlets have of the notion of parabolic molecules, we aim to provide a comprehensive framework which includes customarily

Kutyniok, Gitta

9

Parabolic geometries BGG sequences  

E-Print Network (OSTI)

Parabolic geometries BGG sequences Prolongation procedures BGG Sequences and Geometric sequences and overdetermined systems #12;Parabolic geometries BGG sequences Prolongation procedures Parabolic geometries are a large class of differential geometric structures, which can be described

Drmota, Michael

10

Large-angle Parabolic Equation Methods James T. Kirby*  

E-Print Network (OSTI)

CHAPTER 32 Large-angle Parabolic Equation Methods James T. Kirby* Large-angle parabolic equation of the parabolic equation method (PEM) to any relevant wave propagation problem implies that a principal is to examine two methods of extending the basic parabolic equation method to include large-angle effects

Kirby, James T.

11

Parabolic Quantum Cloak.  

E-Print Network (OSTI)

??It is shown that the parabolic quantum cloak can be theoretically design by using âtransformation design methodâ. We discuss the possibility to build a parabolic… (more)

Chang, Yu-Hsuan

2013-01-01T23:59:59.000Z

12

High Temperature Capacitor Development  

Science Conference Proceedings (OSTI)

The absence of high-temperature electronics is an obstacle to the development of untapped energy resources (deep oil, gas and geothermal). US natural gas consumption is projected to grow from 22 trillion cubic feet per year (tcf) in 1999 to 34 tcf in 2020. Cumulatively this is 607 tcf of consumption by 2020, while recoverable reserves using current technology are 177 tcf. A significant portion of this shortfall may be met by tapping deep gas reservoirs. Tapping these reservoirs represents a significant technical challenge. At these depths, temperatures and pressures are very high and may require penetrating very hard rock. Logistics of supporting 6.1 km (20,000 ft) drill strings and the drilling processes are complex and expensive. At these depths up to 50% of the total drilling cost may be in the last 10% of the well depth. Thus, as wells go deeper it is increasingly important that drillers are able to monitor conditions down-hole such as temperature, pressure, heading, etc. Commercial off-the-shelf electronics are not specified to meet these operating conditions. This is due to problems associated with all aspects of the electronics including the resistors and capacitors. With respect to capacitors, increasing temperature often significantly changes capacitance because of the strong temperature dependence of the dielectric constant. Higher temperatures also affect the equivalent series resistance (ESR). High-temperature capacitors usually have low capacitance values because of these dielectric effects and because packages are kept small to prevent mechanical breakage caused by thermal stresses. Electrolytic capacitors do not operate at temperatures above 150oC due to dielectric breakdown. The development of high-temperature capacitors to be used in a high-pressure high-temperature (HPHT) drilling environment was investigated. These capacitors were based on a previously developed high-voltage hybridized capacitor developed at Giner, Inc. in conjunction with a unique high-temperature electrolyte developed during the course of the program. During this program the feasibility of operating a high voltage hybridized capacitor at 230oC was demonstrated. Capacitor specifications were established in conjunction with potential capacitor users. A method to allow for capacitor operation at both ambient and elevated temperatures was demonstrated. The program was terminated prior to moving into Phase II due to a lack of cost-sharing funds.

John Kosek

2009-06-30T23:59:59.000Z

13

Session: Parabolic Troughs (Presentation)  

DOE Green Energy (OSTI)

The project description is R and D activities at NREL and Sandia aimed at lowering the delivered energy cost of parabolic trough collector systems and FOA awards to support industry in trought development. The primary objectives are: (1) support development of near-term parabolic trought technology for central station power generation; (2) support development of next-generation trought fields; and (3) support expansion of US trough industry. The major FY08 activities were: (1) improving reflector optics; (2) reducing receiver heat loss (including improved receiver coating and mitigating hydrogen accumulation); (3) measuring collector optical efficiency; (4) optimizing plant performance and reducing cost; (5) reducing plant water consumption; and (6) directly supporting industry needs, including FOA support.

Kutscher, C.

2008-04-01T23:59:59.000Z

14

The parabolic Harnack inequality  

E-Print Network (OSTI)

The parabolic Harnack inequality on metric graphs Sebastian Haeseler 1. Basic definitions 2. Volume-doubling properties 3. Poincar´e inequalities 4. The parabolic Harnack inequality 5. Examples The parabolic Harnack parabolic Harnack inequality on metric graphs Sebastian Haeseler 1. Basic definitions 2. Volume

Novak, Erich

15

Progress in parabolic dish technology  

DOE Green Energy (OSTI)

This report describes the current status of parabolic dish technology. Its purpose is to communicate the principal outcomes of DOE's parabolic dish technology RandD efforts carried out at the Solar Energy Research Institute; Sandia National Laboratory, Albuquerque; the Jet Propulsion Laboratory; and other DOE national laboratories. It is written for those in industry, academia, and government who have a special interest in solar thermal systems that use parabolic dishes as collectors. The evolution of parabolic technology is described, and examples of projects in operation and under construction are included. Solar thermal dish technology can supply either electric or thermal energy to various applications over a broad range of system sizes and temperatures. These solar energy systems will be available by the time this country needs additional electric generation capacity -- in the mid to late 1990s -- at costs competitive with other energy sources. 9 refs., 54 figs., 6 tabs.

Stine, W.B.

1989-06-01T23:59:59.000Z

16

Parabolic Raynaud bundles  

E-Print Network (OSTI)

Let X be an irreducible smooth projective curve defined over complex numbers, S= {p_1, p_2,...,p_n} \\subset X$ a finite set of closed points and N > 1 a fixed integer. For any pair (r,d) in Z X Z/N, there exists a parabolic vector bundle R_{r,d,*} on X, with parabolic structure over S and all parabolic weights in Z/N, that has the following property: Take any parabolic vector bundle E_* of rank r on X whose parabolic points are contained in S, all the parabolic weights are in Z/N and the parabolic degree is d. Then E_* is parabolic semistable if and only if there is no nonzero parabolic homomorphism from R_{r,d,*} to E_*.

Biswas, Indranil

2007-01-01T23:59:59.000Z

17

High Temperature Corrosion  

Science Conference Proceedings (OSTI)

Oct 18, 2010 ... Protective Coatings for Corrosion Resistance at High Temperatures: Vilupanur Ravi1; Thuan Nguyen1; Alexander Ly1; Kameron Harmon1; ...

18

Parabolic-like maps  

E-Print Network (OSTI)

In this paper we introduce the notion of parabolic-like mapping, which is an object similar to a polynomial-like mapping, but with a parabolic external class, i.e. an external map with a parabolic fixed point. We prove a straightening theorem for parabolic-like maps, which states that any parabolic-like map of degree 2 is hybrid conjugate to a member of the family Per_1(1), and this member is unique (up to holomorphic conjugacy) if the filled Julia set of the parabolic-like map is connected.

Lomonaco, Luciana Luna Anna

2011-01-01T23:59:59.000Z

19

Presenting parabolic subgroups  

E-Print Network (OSTI)

Consider a relatively hyperbolic group G. We prove that if G is finitely presented, so are its parabolic subgroups. Moreover, a presentation of the parabolic subgroups can be found algorithmically from a presentation of G, a solution of its word problem, and generating sets of the parabolic subgroups. We also give an algorithm that finds parabolic subgroups in a given recursively enumerable class of groups.

Dahmani, François

2010-01-01T23:59:59.000Z

20

High temperature refrigerator  

SciTech Connect

A high temperature magnetic refrigerator which uses a Stirling-like cycle in which rotating magnetic working material is heated in zero field and adiabatically magnetized, cooled in high field, then adiabatically demagnetized. During this cycle said working material is in heat exchange with a pumped fluid which absorbs heat from a low temperature heat source and deposits heat in a high temperature reservoir. The magnetic refrigeration cycle operates at an efficiency 70% of Carnot.

Steyert, Jr., William A. (Los Alamos, NM)

1978-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "include high-temperature parabolic" 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

High temperature furnace  

DOE Patents (OSTI)

A high temperature furnace for use above 2000.degree.C is provided that features fast initial heating and low power consumption at the operating temperature. The cathode is initially heated by joule heating followed by electron emission heating at the operating temperature. The cathode is designed for routine large temperature excursions without being subjected to high thermal stresses. A further characteristic of the device is the elimination of any ceramic components from the high temperature zone of the furnace.

Borkowski, Casimer J. (Oak Ridge, TN)

1976-08-03T23:59:59.000Z

22

High temperature superconductor current leads  

DOE Patents (OSTI)

An electrical lead having one end for connection to an apparatus in a cryogenic environment and the other end for connection to an apparatus outside the cryogenic environment. The electrical lead includes a high temperature superconductor wire and an electrically conductive material distributed therein, where the conductive material is present at the one end of the lead at a concentration in the range of from 0 to about 3% by volume, and at the other end of the lead at a concentration of less than about 20% by volume. Various embodiments are shown for groups of high temperature superconductor wires and sheaths.

Hull, John R. (Hinsdale, IL); Poeppel, Roger B. (Glen Ellyn, IL)

1995-01-01T23:59:59.000Z

23

High temperature turbine engine structure  

DOE Patents (OSTI)

A high temperature turbine engine includes a rotor portion having axially stacked adjacent ceramic rotor parts. A ceramic/ceramic joint structure transmits torque between the rotor parts while maintaining coaxial alignment and axially spaced mutually parallel relation thereof despite thermal and centrifugal cycling.

Boyd, Gary L. (Tempe, AZ)

1991-01-01T23:59:59.000Z

24

High temperature turbine engine structure  

DOE Patents (OSTI)

A high temperature turbine engine includes a hybrid ceramic/metallic rotor member having ceramic/metal joint structure. The disclosed joint is able to endure higher temperatures than previously possible, and aids in controlling heat transfer in the rotor member.

Boyd, Gary L. (Tempe, AZ)

1990-01-01T23:59:59.000Z

25

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

26

Deep Trek High Temperature Electronics Project  

Science Conference Proceedings (OSTI)

This report summarizes technical progress achieved during the cooperative research agreement between Honeywell and U.S. Department of Energy to develop high-temperature electronics. Objects of this development included Silicon-on-Insulator (SOI) wafer process development for high temperature, supporting design tools and libraries, and high temperature integrated circuit component development including FPGA, EEPROM, high-resolution A-to-D converter, and a precision amplifier.

Bruce Ohme

2007-07-31T23:59:59.000Z

27

PARABOLIC GEODESICS AS PARALLEL CURVES IN PARABOLIC GEOMETRIES  

E-Print Network (OSTI)

PARABOLIC GEODESICS AS PARALLEL CURVES IN PARABOLIC GEOMETRIES MARC HERZLICH Abstract. We give a simple characterization of the parabolic geodesics introduced by Cap, Slovák and Zádník for all parabolic then show that parabolic geodesics can be characterized as the following data: a curve on the manifold

Paris-Sud XI, Université de

28

High Temperature ESP Monitoring  

SciTech Connect

The objective of the High Temperature ESP Monitoring project was to develop a downhole monitoring system to be used in wells with bottom hole well temperatures up to 300°C for measuring motor temperature, formation pressure, and formation temperature. These measurements are used to monitor the health of the ESP motor, to track the downhole operating conditions, and to optimize the pump operation. A 220 ºC based High Temperature ESP Monitoring system was commercially released for sale with Schlumberger ESP motors April of 2011 and a 250 ºC system with will be commercially released at the end of Q2 2011. The measurement system is now fully qualified, except for the sensor, at 300 °C.

Jack Booker; Brindesh Dhruva

2011-06-20T23:59:59.000Z

29

High temperature turbine engine structure  

DOE Patents (OSTI)

A high temperature ceramic/metallic turbine engine includes a metallic housing which journals a rotor member of the turbine engine. A ceramic disk-like shroud portion of the engine is supported on the metallic housing portion and maintains a close running clearance with the rotor member. A ceramic spacer assembly maintains the close running clearance of the shroud portion and rotor member despite differential thermal movements between the shroud portion and metallic housing portion.

Carruthers, William D. (Mesa, AZ); Boyd, Gary L. (Tempe, AZ)

1992-01-01T23:59:59.000Z

30

High temperature turbine engine structure  

DOE Patents (OSTI)

A high temperature ceramic/metallic turbine engine includes a metallic housing which journals a rotor member of the turbine engine. A ceramic disk-like shroud portion of the engine is supported on the metallic housing portion and maintains a close running clearance with the rotor member. A ceramic spacer assembly maintains the close running clearance of the shroud portion and rotor member despite differential thermal movements between the shroud portion and metallic housing portion.

Carruthers, William D. (Mesa, AZ); Boyd, Gary L. (Tempe, AZ)

1993-01-01T23:59:59.000Z

31

High temperature turbine engine structure  

DOE Patents (OSTI)

A high temperature ceramic/metallic turbine engine includes a metallic housing which journals a rotor member of the turbine engine. A ceramic disk-like shroud portion of the engine is supported on the metallic housing portion and maintains a close running clearance with the rotor member. A ceramic spacer assembly maintains the close running clearance of the shroud portion and rotor member despite differential thermal movements between the shroud portion and metallic housing portion.

Carruthers, William D. (Mesa, AZ); Boyd, Gary L. (Tempe, AZ)

1994-01-01T23:59:59.000Z

32

Parabolic flows on complex manifolds  

E-Print Network (OSTI)

Chapter 2 Convergence of the parabolic complex Monge-Amp`ere65] Streets, J. , Tian, G. A parabolic flow of pluriclosedGill, M. Convergence of the parabolic complex Monge-Amp` ere

Gill, Matthew Franklin

2012-01-01T23:59:59.000Z

33

Parabolic cylinder functions implemented in Matlab  

E-Print Network (OSTI)

Routines for computation of Weber's parabolic cylinder functions and their derivatives are implemented in Matlab for both moderate and great values of the argument. Standard, real solutions are considered. Tables of values are included.

E. Cojocaru

2009-01-15T23:59:59.000Z

34

Optimal control, parabolic equations, st  

E-Print Network (OSTI)

state constraints, for parabolic systems have been studied in Casas [20], ... troduced for deriving optimality conditionsfor parabolic problems with pure or mixed.

35

Parabolic flows on complex manifolds.  

E-Print Network (OSTI)

??We prove C ? convergence for suitably normalized solutions of the parabolic complex Monge-Ampère equation on compact Hermitian manifolds. This provides a parabolic proof of… (more)

Gill, Matthew Franklin

2012-01-01T23:59:59.000Z

36

High temperature superconducting fault current limiter  

DOE Patents (OSTI)

A fault current limiter for an electrical circuit is disclosed. The fault current limiter includes a high temperature superconductor in the electrical circuit. The high temperature superconductor is cooled below its critical temperature to maintain the superconducting electrical properties during operation as the fault current limiter. 15 figs.

Hull, J.R.

1997-02-04T23:59:59.000Z

37

High temperature thermometric phosphors  

SciTech Connect

A high temperature phosphor consists essentially of a material having the general formula LuPO.sub.4 :Dy.sub.(x),Eu.sub.y) wherein: 0.1 wt %.ltoreq.x.ltoreq.20 wt % and 0.1 wt %.ltoreq.y.ltoreq.20 wt %. The high temperature phosphor is in contact with an article whose temperature is to be determined. The article having the phosphor in contact with it is placed in the environment for which the temperature of the article is to be determined. The phosphor is excited by a laser causing the phosphor to fluoresce. The emission from the phosphor is optically focused into a beam-splitting mirror which separates the emission into two separate emissions, the emission caused by the dysprosium dopant and the emission caused by the europium dopent. The separated emissions are optically filtered and the intensities of the emission are detected and measured. The ratio of the intensity of each emission is determined and the temperature of the article is calculated from the ratio of the intensities of the separate emissions.

Allison, Stephen W. (Knoxville, TN); Cates, Michael R. (Oak Ridge, TN); Boatner, Lynn A. (Oak Ridge, TN); Gillies, George T. (Earlysville, VA)

1999-03-23T23:59:59.000Z

38

Parabolic Trough VSHOT Optical Characterization in 2005-2006 (Presentation)  

DOE Green Energy (OSTI)

This presentation regarding parabolic trough VSHOT optical characterization describes trough deployment and operation phases including: development, manufacture/installation, and maintenance/operation.

Wendelin, T.

2006-02-01T23:59:59.000Z

39

On parabolic Whittaker functions  

E-Print Network (OSTI)

We derive a Mellin-Barnes integral representation for solution to generalized (parabolic) quantum Toda lattice introduced in \\cite{GLO}, which presumably describes the $(S^1\\times U_N)$-equivariant Gromov-Witten invariants of Grassmann variety.

Sergey Oblezin

2010-11-18T23:59:59.000Z

40

On parabolic Whittaker functions  

E-Print Network (OSTI)

We derive a Mellin-Barnes integral representation for solution to generalized (parabolic) quantum Toda lattice introduced in \\cite{GLO}, which presumably describes the $(S^1\\times U_N)$-equivariant Gromov-Witten invariants of Grassmann variety.

Oblezin, Sergey

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "include high-temperature parabolic" 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

High Temperature Superconductivity Partners | Department of Energy  

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

High Temperature Superconductivity Partners High Temperature Superconductivity Partners Map showing DOE's partnersstakeholders in the High Temperature Superconductivity Program...

42

Parabolic concentrating collector: a tutorial  

DOE Green Energy (OSTI)

A tutorial overview of point-focusing parabolic collectors is presented. Optical and thermal characteristics of such collectors are discussed. Data representing typical achievable collector efficiencies are presented and the importance of balancing collector cost with concentrator quality is argued through the development of a figure of merit for the collector. The impact of receiver temperature on performance is assessed and the general observation made that temperatures much in excess of 1500 to 2000/sup 0/F can actually result in decreased performance. Various types of two-axis tracking collectors are described, including the standard parabolic deep dish, Cassegrainian and Fresnel, as well as two forms of fixed mirrors with articulating receivers. The present DOE program to develop these devices is briefly discussed, as are present and projected costs for these collectors. Pricing information is presented for the only known commercial design available on the open market.

Truscello, V.C.

1979-02-15T23:59:59.000Z

43

High temperature interfacial superconductivity  

DOE Patents (OSTI)

High-temperature superconductivity confined to nanometer-scale interfaces has been a long standing goal because of potential applications in electronic devices. The spontaneous formation of a superconducting interface in bilayers consisting of an insulator (La.sub.2CuO.sub.4) and a metal (La.sub.1-xSr.sub.xCuO.sub.4), neither of which is superconducting per se, is described. Depending upon the layering sequence of the bilayers, T.sub.c may be either .about.15 K or .about.30 K. This highly robust phenomenon is confined to within 2-3 nm around the interface. After exposing the bilayer to ozone, T.sub.c exceeds 50 K and this enhanced superconductivity is also shown to originate from a 1 to 2 unit cell thick interfacial layer. The results demonstrate that engineering artificial heterostructures provides a novel, unconventional way to fabricate stable, quasi two-dimensional high T.sub.c phases and to significantly enhance superconducting properties in other superconductors. The superconducting interface may be implemented, for example, in SIS tunnel junctions or a SuFET.

Bozovic, Ivan (Mount Sinai, NY); Logvenov, Gennady (Port Jefferson Station, NY); Gozar, Adrian Mihai (Port Jefferson, NY)

2012-06-19T23:59:59.000Z

44

Secondary concentrators for parabolic dish solar thermal power systems  

SciTech Connect

One approach to production of electricity or high-temperature process heat from solar energy is to use point-focusing, two-axis pointing concentrators in a distributed-receiver solar thermal system. This paper discusses some of the possibilities and problems in using compound concentrators in parabolic dish systems. 18 refs.

Jaffe, L.D.; Poon, P.T.

1981-01-01T23:59:59.000Z

45

Solar parabolic dish annual technology evaluation report. Fiscal year 1982  

DOE Green Energy (OSTI)

This report summarizes the activities of the JPL Solar Thermal Power Systems Parabolic Dish Project for FY 1982. Included are discussions on designs of module development including their concentrator, receiver, and power conversion subsystems. Analyses and test results, along with progress on field tests, Small Community Experiment System development, and tests at the Parabolic Dish Test Site are also included.

Not Available

1983-09-15T23:59:59.000Z

46

High temperature catalytic membrane reactors  

DOE Green Energy (OSTI)

Current state-of-the-art inorganic oxide membranes offer the potential of being modified to yield catalytic properties. The resulting modules may be configured to simultaneously induce catalytic reactions with product concentration and separation in a single processing step. Processes utilizing such catalytically active membrane reactors have the potential for dramatically increasing yield reactions which are currently limited by either thermodynamic equilibria, product inhibition, or kinetic selectivity. Examples of commercial interest include hydrogenation, dehydrogenation, partial and selective oxidation, hydrations, hydrocarbon cracking, olefin metathesis, hydroformylation, and olefin polymerization. A large portion of the most significant reactions fall into the category of high temperature, gas phase chemical and petrochemical processes. Microporous oxide membranes are well suited for these applications. A program is proposed to investigate selected model reactions of commercial interest (i.e. dehydrogenation of ethylbenzene to styrene and dehydrogenation of butane to butadiene) using a high temperature catalytic membrane reactor. Membranes will be developed, reaction dynamics characterized, and production processes developed, culminating in laboratory-scale demonstration of technical and economic feasibility. As a result, the anticipated increased yield per reactor pass economic incentives are envisioned. First, a large decrease in the temperature required to obtain high yield should be possible because of the reduced driving force requirement. Significantly higher conversion per pass implies a reduced recycle ratio, as well as reduced reactor size. Both factors result in reduced capital costs, as well as savings in cost of reactants and energy.

Not Available

1990-03-01T23:59:59.000Z

47

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.

48

Properties of parabolic Sobolev and parabolic Besov spaces  

E-Print Network (OSTI)

In this paper, we characterize parabolic Besov and parabolic Sobolev spaces in ${\\bf R}^{n+1}$ and ${\\bf R}^{n+1}_T, \\,\\, T > 0$. We also, study the relation between parabolic Besov spaces in ${\\bf R}^{n}_T, \\,\\, T > 0$ and standard Besov space in $\\R$.

Chang, Tongkeun

2011-01-01T23:59:59.000Z

49

High Temperature and Electrical Properties  

Science Conference Proceedings (OSTI)

Mar 5, 2013... and Nanomaterials: High Temperature and Electrical Properties ... thermomechanical (or in cyclic power) loading of electronic devices is an ...

50

Ultra High Temperature Ceramic Composites  

Science Conference Proceedings (OSTI)

Oct 9, 2012 ... These ceramics, often combined with 20-30% SiC, have been studied extensively in monolithic form, demonstrating excellent high-temperature ...

51

Electromagnetic Casimir forces of parabolic cylinder and knife-edge geometries  

E-Print Network (OSTI)

An exact calculation of electromagnetic scattering from a perfectly conducting parabolic cylinder is employed to compute Casimir forces in several configurations. These include interactions between a parabolic cylinder and ...

Graham, Noah

52

NREL: TroughNet - U.S. Parabolic Trough Power Plant Data  

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

U.S. Parabolic Trough Power Plant Data Here you'll find data on parabolic trough power plants in operation and under development in the United States. The data include plant type,...

53

High temperature polymer concrete  

DOE Patents (OSTI)

This invention is concerned with a polymer concrete composition, which is a two-component composition useful with many bases including metal. Component A, the aggregate composition, is broadly composed of silica, silica flour, portland cement, and acrylamide, whereas Component B, which is primarily vinyl and acrylyl reactive monomers, is a liquid system.

Fontana, J.J.; Reams, W.

1984-05-29T23:59:59.000Z

54

PARABOLIC EXHAUSTIONS AND ANALYTIC COVERINGS  

E-Print Network (OSTI)

PARABOLIC EXHAUSTIONS AND ANALYTIC COVERINGS Finnur L´arusson January 31, 1993 Abstract. Let be a parabolic exhaustion on a Stein manifold X such that is strictly plurisubharmonic at its zeros. The metric to be parabolic because its logarithm is plurisubharmonic and satisfies the so-called Monge-Amp`ere equation

Lárusson, Finnur

55

THE STRUCTURE OF TWO-PARABOLIC SPACE: PARABOLIC DUST AND ITERATION.  

E-Print Network (OSTI)

Abstract. A non-elementary Möbius group generated by twoparabolics is determined up to conjugation by one complex parameter and the parameter space has been extensively studied. In this paper, we use the results of [7] to obtain an additional structure for the parameter space, which we term the two-parabolic space. This structure allows us to identify groups that contain additional conjugacy classes of primitive parabolics, which following [14] we call parabolic dust groups, non-free groups off the real axis, and groups that are both parabolic dust and non-free; some of these contain Z × Z subgroups. The structure theorem also attaches additional geometric structure to discrete and non-discrete groups lying in given regions of the parameter space including a new explicit construction of some non-classical T-Schottky groups. 1.

Jane Gilman

2007-01-01T23:59:59.000Z

56

Parabolically connected subgroups  

SciTech Connect

All reductive spherical subgroups of the group SL(n) are found for which the intersections with every parabolic subgroup of SL(n) are connected. This condition guarantees that open equivariant embeddings of the corresponding homogeneous spaces into Moishezon spaces are algebraic. Bibliography: 6 titles.

Netai, Igor V [M. V. Lomonosov Moscow State University, Faculty of Mechanics and Mathematics, Moscow (Russian Federation)

2011-08-31T23:59:59.000Z

57

A compound parabolic concentrator  

SciTech Connect

A compound parabolic concentrator (CPC) for solar energy applications is presented in this work. A prototype was built and its thermal performance was determined. Operating temperatures of the order of 150 /sup 0/C with a reasonable efficiency can be attained by means of a fixed CPC.

Manrique, J.A.

1984-05-01T23:59:59.000Z

58

High Temperature | Open Energy Information  

Open Energy Info (EERE)

Temperature Temperature Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Sanyal Temperature Classification: High Temperature Dictionary.png High Temperature: No definition has been provided for this term. Add a Definition Sanyal Temp Classification This temperature scheme was developed by Sanyal in 2005 at the request of DOE and GEA, as reported in Classification of Geothermal Systems: A Possible Scheme. Extremely Low Temperature Very Low Temperature Low Temperature Moderate Temperature High Temperature Ultra High Temperature Steam Field Reservoir fluid between 230°C and 300°C is considered by Sanyal to be "high temperature." "Above a temperature level of 230°C, the reservoir would be expected to become two-phase at some point during exploitation. The next higher

59

Parabolic submanifolds of rank two  

E-Print Network (OSTI)

The goal of this paper is to classify parametrically parabolic submanifolds in any codimension. First, we describe the ones that are ruled and show that they are the only parabolic submanifolds that admit an isometric immersion as a hypersurface. Then, we classify the nonruled ones by two different means. In fact, we provide the polar and bipolar parametrizations, each of which is associated to a parabolic surface and a function on the surface which satisfies a parabolic differential equation. To conclude, we describe the structure of the singular set of the nonruled parabolic submanifolds.

Dajczer, Marcos

2009-01-01T23:59:59.000Z

60

Parabolic k-ample bundles  

E-Print Network (OSTI)

We construct projectivization of a parabolic vector bundle and a tautological line bundle over it. It is shown that a parabolic vector bundle is ample if and only if the tautological line bundle is ample. This allows us to generalize the notion of a k-ample bundle, introduced by Sommese, to the context of parabolic bundles. A parabolic vector bundle $E_*$ is defined to be k-ample if the tautological line bundle ${\\mathcal O}_{{\\mathbb P}(E_*)}(1)$ is $k$--ample. We establish some properties of parabolic k-ample bundles.

Biswas, Indranil

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "include high-temperature parabolic" 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

Hydrogen Production from Nuclear Energy via High Temperature Electrolysis  

DOE Green Energy (OSTI)

This paper presents the technical case for high-temperature nuclear hydrogen production. A general thermodynamic analysis of hydrogen production based on high-temperature thermal water splitting processes is presented. Specific details of hydrogen production based on high-temperature electrolysis are also provided, including results of recent experiments performed at the Idaho National Laboratory. Based on these results, high-temperature electrolysis appears to be a promising technology for efficient large-scale hydrogen production.

James E. O'Brien; Carl M. Stoots; J. Stephen Herring; Grant L. Hawkes

2006-04-01T23:59:59.000Z

62

Measurement and Calculation of Electrochemical Potentials in Hydrogenated High Temperature Water, including an Evaluation of the Yttria-Stabilized Zirconia/Iron-Iron Oxide (Fe/Fe3O4) Probe as Reference Electrode  

DOE Green Energy (OSTI)

The importance of knowing the electrochemical corrosion potential (ECP, also referred to as E{sub con}) of nickel-base alloys in hydrogenated water is related to the need to understand the effects of dissolved (i.e., aqueous) hydrogen concentration ([H{sub 2}]) on primary water stress corrosion cracking (PWSCC). Also, the use of a reference electrode (RE) can improve test quality by heightening the ability to detect instances of out-of-specification or unexpected chemistry. Three methods are used to measure and calculate the ECP of nickel-based alloys in hydrogenated water containing {approx} 1 to 150 scc/kg H{sub 2} (0.1 to 13.6 ppm H{sub 2}) at 260 to 360 C. The three methods are referred to as the specimen/component method, the platinum (Pt) method, and the yttria-stabilized zirconia/iron-iron oxide (YSZ/Fe-Fe{sub 3}O{sub 4}) RE method. The specimen/component method relies upon the assumption that the specimen or component behaves as a hydrogen electrode, and its E{sub corr} is calculated using the Nernst equation. The present work shows that this method is valid for aqueous H{sub 2} levels {ge} {approx} 5 to 10 scc/kg H{sub 2}. The Pt method uses a voltage measurement between the specimen or component and a Pt electrode, with the Pt assumed to behave as a hydrogen electrode; this method is valid as long as the aqueous H{sub 2}level is known. The YSZ/Fe-Fe{sub 3}O{sub 4}, which represents a relatively new approach for measuring E{sub corr} in this environment, can be used even if the aqueous H{sub 2} level is unknown. The electrochemical performance of the YSZ/Fe-Fe{sub 3}O{sub 4} probe supports its viability as a RE for use in high temperature hydrogenated water. Recent design modifications incorporating a teflon sealant have improved the durability of this RE (however, some of the REs do still fail prematurely due to water in-leakage). The Pt method is judged to represent the best overall approach, though there are cases where the other methods are superior. For example, the specimen/component method provides the simplest approach for calculating the E{sub corr} of plant components, and the YSZ/Fe-Fe{sub 3}O{sub 4} RE method provides the best approach if the H{sub 2} level is unknown, or in off-nominal chemistry conditions. The present paper describes the use of these methods to determine the ECP of a specimen or component versus the ECP of the nickel/nickel oxide (Ni/NiO) phase transition, which is important since prior work has shown that this parameter (ECP-ECP{sub Ni/NiO}) can be used to assess aqueous H{sub 2} effects on PWSCC.

Steven A. Attanasio; David S. Morton; Mark A. Ando

2001-10-22T23:59:59.000Z

63

Investigations into High Temperature Components and Packaging  

SciTech Connect

The purpose of this report is to document the work that was performed at the Oak Ridge National Laboratory (ORNL) in support of the development of high temperature power electronics and components with monies remaining from the Semikron High Temperature Inverter Project managed by the National Energy Technology Laboratory (NETL). High temperature electronic components are needed to allow inverters to operate in more extreme operating conditions as required in advanced traction drive applications. The trend to try to eliminate secondary cooling loops and utilize the internal combustion (IC) cooling system, which operates with approximately 105 C water/ethylene glycol coolant at the output of the radiator, is necessary to further reduce vehicle costs and weight. The activity documented in this report includes development and testing of high temperature components, activities in support of high temperature testing, an assessment of several component packaging methods, and how elevated operating temperatures would impact their reliability. This report is organized with testing of new high temperature capacitors in Section 2 and testing of new 150 C junction temperature trench insulated gate bipolar transistor (IGBTs) in Section 3. Section 4 addresses some operational OPAL-GT information, which was necessary for developing module level tests. Section 5 summarizes calibration of equipment needed for the high temperature testing. Section 6 details some additional work that was funded on silicon carbide (SiC) device testing for high temperature use, and Section 7 is the complete text of a report funded from this effort summarizing packaging methods and their reliability issues for use in high temperature power electronics. Components were tested to evaluate the performance characteristics of the component at different operating temperatures. The temperature of the component is determined by the ambient temperature (i.e., temperature surrounding the device) plus the temperature increase inside the device due the internal heat that is generated due to conduction and switching losses. Capacitors and high current switches that are reliable and meet performance specifications over an increased temperature range are necessary to realize electronics needed for hybrid-electric vehicles (HEVs), fuel cell (FC) and plug-in HEVs (PHEVs). In addition to individual component level testing, it is necessary to evaluate and perform long term module level testing to ascertain the effects of high temperature operation on power electronics.

Marlino, L.D.; Seiber, L.E.; Scudiere, M.B.; M.S. Chinthavali, M.S.; McCluskey, F.P.

2007-12-31T23:59:59.000Z

64

High-temperature ceramic receivers  

DOE Green Energy (OSTI)

An advanced ceramic dome cavity receiver is discussed which heats pressurized gas to temperatures above 1800/sup 0/F (1000/sup 0/C) for use in solar Brayton power systems of the dispersed receiver/dish or central receiver type. Optical, heat transfer, structural, and ceramic material design aspects of the receiver are reported and the development and experimental demonstration of a high-temperature seal between the pressurized gas and the high-temperature silicon carbide dome material is described.

Jarvinen, P. O.

1980-01-01T23:59:59.000Z

65

High temperature ceramic/metal joint structure  

DOE Patents (OSTI)

A high temperature turbine engine includes a hybrid ceramic/metallic rotor member having ceramic/metal joint structure. The disclosed joint is able to endure higher temperatures than previously possible, and aids in controlling heat transfer in the rotor member.

Boyd, Gary L. (Tempe, AZ)

1991-01-01T23:59:59.000Z

66

Parabolic John-Nirenberg spaces  

E-Print Network (OSTI)

We introduce a parabolic version of John-Nirenberg space with exponent $p$ and show that it is contained in local weak-$L^p$ spaces.

Berkovits, Lauri

2011-01-01T23:59:59.000Z

67

CALCULATING THE PARABOLIC CHERN CHARACTER OF A LOCALLY ABELIAN PARABOLIC BUNDLE  

E-Print Network (OSTI)

CALCULATING THE PARABOLIC CHERN CHARACTER OF A LOCALLY ABELIAN PARABOLIC BUNDLE CHADI HASSAN TAHER Abstract. We calculate the parabolic Chern character of a bundle with locally abelian parabolic structure for the parabolic Chern character of a locally abelian parabolic bundle on (X, D) in terms of: --the Chern character

Paris-Sud XI, Université de

68

High Temperature Optical Gas Sensing  

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

Optical Gas Sensing Optical Gas Sensing Opportunity Research is active on optical sensors integrated with advanced sensing materials for high temperature embedded gas sensing applications. Patent applications have been filed for two inventions in this area and several other methods are currently under development. These technologies are available for licensing and/or further collaborative research from the U.S. Department of Energy's National Energy Technology Laboratory (NETL). Organizations or individuals with capabilities in optical sensor packaging for harsh environment and high temperature applications are encouraged to contact NETL to explore potential collaborative opportunities. Overview Contact NETL Technology Transfer Group techtransfer@netl.doe.gov

69

Solar parabolic dish technology annual evaluation report. Fiscal year 1983  

DOE Green Energy (OSTI)

This report summarizes the activities of the JPL Solar Thermal Power Systems Parabolic Dish Project for FY 1983. Included are discussions on designs of module development including their concentrator, receiver, and power conversion subsystem together with a separate discussion of concentrator development. Analyses and test results, along with progress on field tests, Small Community Experiment system development, and tests at the Parabolic Dish Test Site are also included.

Not Available

1984-04-15T23:59:59.000Z

70

Orthogonal parabolic reflector systems  

SciTech Connect

A structure is described comprising: a reflecting surface which has an axis and is open at least at one axial end and in an axial section generally conforms to an axial section through a surface generated by rotating a portion of a parabolic curve about an axis perpendicular to the axis of the parabola defined by the curve; and an elongated source/sink which extends at least in the direction of the axis of the reflecting surface and is at least partly enveloped by the reflecting surface.

Cheng, D.Y.

1993-08-10T23:59:59.000Z

71

High Temperature Oxidation and Design for Resistance  

Science Conference Proceedings (OSTI)

Mar 2, 2011 ... Overall weight uptakes followed linear kinetics in dry CO2, but additions of H2O caused a transition to parabolic kinetics. In contrast, high ...

72

Establishment of Harrop, High-Temperature Viscometer  

Science Conference Proceedings (OSTI)

This report explains how the Harrop, High-Temperature Viscometer was installed, calibrated, and operated. This report includes assembly and alignment of the furnace, viscometer, and spindle, and explains the operation of the Brookfield Viscometer, the Harrop furnace, and the UDC furnace controller. Calibration data and the development of the spindle constant from NIST standard reference glasses is presented. A simple operational procedure is included.

Schumacher, R.F.

1999-11-05T23:59:59.000Z

73

High-temperature plasma physics  

SciTech Connect

Both magnetic and inertial confinement research are entering the plasma parameter range of fusion reactor interest. This paper reviews the individual and common technical problems of these two approaches to the generation of thermonuclear plasmas, and describes some related applications of high-temperature plasma physics.

Furth, H.P.

1988-03-01T23:59:59.000Z

74

High temperature lightweight foamed cements  

DOE Patents (OSTI)

Cement slurries are disclosed which are suitable for use in geothermal wells since they can withstand high temperatures and high pressures. The formulation consists of cement, silica flour, water, a retarder, a foaming agent, a foam stabilizer, and a reinforcing agent. A process for producing these cements is also disclosed. 3 figs.

Sugama, Toshifumi.

1989-10-03T23:59:59.000Z

75

High temperature lightweight foamed cements  

DOE Patents (OSTI)

Cement slurries are disclosed which are suitable for use in geothermal wells since they can withstand high temperatures and high pressures. The formulation consists of cement, silica flour, water, a retarder, a foaming agent, a foam stabilizer, and a reinforcing agent. A process for producing these cements is also disclosed.

Sugama, Toshifumi (Mastic Beach, NY)

1989-01-01T23:59:59.000Z

76

Geothermal high temperature instrumentation applications  

DOE Green Energy (OSTI)

A quick look at the geothermal industry shows a small industry producing about $1 billion in electric sales annually. The industry is becoming older and in need of new innovative solutions to instrumentation problems. A quick look at problem areas is given along with basic instrumentation requirements. The focus of instrumentation is on high temperature electronics.

Normann, R.A. [Sandia National Labs., Albuquerque, NM (United States); Livesay, B.J. [Livesay Consultants (United States)

1998-06-11T23:59:59.000Z

77

High temperature electronic gain device  

SciTech Connect

An integrated thermionic device suitable for use in high temperature, high radiation environments. Cathode and control electrodes are deposited on a first substrate facing an anode on a second substrate. The substrates are sealed to a refractory wall and evacuated to form an integrated triode vacuum tube.

McCormick, J. Byron (Los Alamos, NM); Depp, Steven W. (Los Alamos, NM); Hamilton, Douglas J. (Tucson, AZ); Kerwin, William J. (Tucson, AZ)

1979-01-01T23:59:59.000Z

78

High temperature mineral fiber binder  

SciTech Connect

A modified phenol formaldehyde condensate is reacted with boric acid and cured in the presence of a polyfunctional nitrogeneous compound to provide a binder for mineral wool fibers which is particularly suited for thermal insulation products intended for high temperature service.

Miedaner, P.M.

1980-11-25T23:59:59.000Z

79

HIGH TEMPERATURE GEOTHERMAL RESERVOIR ENGINEERING  

E-Print Network (OSTI)

on the Cerro P r i e t o Geothermal F i e l d , Mexicali,e C e r r o P r i e t o Geothermal F i e l d , Baja C a l i1979 HIGH TEMPERATURE GEOTHERMAL RESERVOIR ENGINEERING R.

Schroeder, R.C.

2009-01-01T23:59:59.000Z

80

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

Note: This page contains sample records for the topic "include high-temperature parabolic" 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

Solar thermal parabolic dish systems: technology and applications  

DOE Green Energy (OSTI)

This presentation surveys the status and some probable future courses of development of parabolic dish solar collector technology and some of the near-term and long-range applications of the technology. Included are fundamentals of the technology, descriptions of current collectors with particular emphasis on the types developed within the Department of Energy's Solar Thermal Program, descriptions of current systems and applications, key technical issues and tradeoff considerations which will affect the competition between parabolic dish systems and other solar thermal technologies, and, finally, a discussion of future possibilities for the development of parabolic dish technology.

Leonard, J.A.

1984-05-01T23:59:59.000Z

82

High Temperature Materials Interim Data Qualification Report  

SciTech Connect

ABSTRACT Projects for the very high temperature reactor (VHTR) Technology Development Office provide data in support of Nuclear Regulatory Commission licensing of the VHTR. Fuel and materials to be used in the reactor are tested and characterized to quantify performance in high temperature and high fluence environments. The VHTR program has established the NGNP Data Management and Analysis System (NDMAS) to ensure that VHTR data are qualified for use, stored in a readily accessible electronic form, and analyzed to extract useful results. This document focuses on the first NDMAS objective. It describes the High Temperature Materials characterization data stream, the processing of these data within NDMAS, and reports the interim FY2010 qualification status of the data. Data qualification activities within NDMAS for specific types of data are determined by the data qualification category assigned by the data generator. The High Temperature Materials data are being collected under NQA-1 guidelines, and will be qualified data. For NQA-1 qualified data, the qualification activities include: (1) capture testing, to confirm that the data stored within NDMAS are identical to the raw data supplied, (2) accuracy testing to confirm that the data are an accurate representation of the system or object being measured, and (3) documenting that the data were collected under an NQA-1 or equivalent Quality Assurance program. Currently, data from two test series within the High Temperature Materials data stream have been entered into the NDMAS vault: 1. Tensile Tests for Sm (i.e., Allowable Stress) Confirmatory Testing – 1,403,994 records have been inserted into the NDMAS database. Capture testing is in process. 2. Creep-Fatigue Testing to Support Determination of Creep-Fatigue Interaction Diagram – 918,854 records have been processed and inserted into the NDMAS database. Capture testing is in process.

Nancy Lybeck

2010-08-01T23:59:59.000Z

83

Manufacturing Barriers to High Temperature PEM Commercialization  

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

9/2011 9/2011 1 BASF Fuel Cell, Inc. Manufacturing Barriers to high temperature PEM commercialization 39 Veronica Ave Somerset , NJ 08873 Tel : (732) 545-5100 9/9/2011 2 Background on BASF Fuel Cell  BASF Fuel Cell was established in 2007, formerly PEMEAS Fuel Cells (including E-TEK)  Product line is high temperature MEAs (Celtec ® P made from PBI-phosphoric acid)  Dedicated a new advanced pilot manufacturing facility in Somerset NJ May 2009. Ribbon-cutting hosted by Dr. Kreimeyer (BASF BoD, right) and attended by various US pubic officials including former NJ Governor Jon Corzine (left) 9/9/2011 3 Multi-layer product of membrane (polybenzimidazole and phosphoric acid), gas diffusion material and catalysts Unique characteristics:  High operating temperature

84

High temperature structural insulating material  

DOE Patents (OSTI)

A high temperature structural insulating material useful as a liner for cylinders of high temperature engines through the favorable combination of high service temperature (above about 800/sup 0/C), low thermal conductivity (below about 0.2 W/m/sup 0/C), and high compressive strength (above about 250 psi). The insulating material is produced by selecting hollow ceramic beads with a softening temperature above about 800/sup 0/C, a diameter within the range of 20-200 ..mu..m, and a wall thickness in the range of about 2 to 4 ..mu..m; compacting the beads and a compatible silicate binder composition under pressure and sintering conditions to provide the desired structural form with the structure having a closed-cell, compact array of bonded beads.

Chen, W.Y.

1984-07-27T23:59:59.000Z

85

High Temperature Heat Exchanger Project  

Science Conference Proceedings (OSTI)

The UNLV Research Foundation assembled a research consortium for high temperature heat exchanger design and materials compatibility and performance comprised of university and private industry partners under the auspices of the US DOE-NE Nuclear Hydrogen Initiative in October 2003. The objectives of the consortium were to conduct investigations of candidate materials for high temperature heat exchanger componets in hydrogen production processes and design and perform prototypical testing of heat exchangers. The initial research of the consortium focused on the intermediate heat exchanger (located between the nuclear reactor and hydrogen production plan) and the components for the hydrogen iodine decomposition process and sulfuric acid decomposition process. These heat exchanger components were deemed the most challenging from a materials performance and compatibility perspective

Anthony E. Hechanova, Ph.D.

2008-09-30T23:59:59.000Z

86

High-temperature geothermal cableheads  

DOE Green Energy (OSTI)

Two high-temperature, corrosion-resistant logging cableheads which use metal seals and a stable fluid to achieve proper electrical terminations and cable-sonde interfacings are described. A tensile bar provides a calibrated yield point, and a cone assembly anchors the cable armor to the head. Electrical problems of the sort generally ascribable to the cable-sonde interface were absent during demonstration hostile-environment loggings in which these cableheads were used.

Coquat, J.A.; Eifert, R.W.

1981-11-01T23:59:59.000Z

87

HIGH TEMPERATURE MICROSCOPE AND FURNACE  

DOE Patents (OSTI)

A high-temperature microscope is offered. It has a reflecting optic situated above a molten specimen in a furnace and reflecting the image of the same downward through an inert optic member in the floor of the furnace, a plurality of spaced reflecting plane mirrors defining a reflecting path around the furnace, a standard microscope supported in the path of and forming the end terminus of the light path.

Olson, D.M.

1961-01-31T23:59:59.000Z

88

High-Temperature Superconductivity Cable Demonstration Projects...  

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

High-Temperature Superconductivity Cable Demonstration Projects High-Temperature Superconductivity Cable Demonstration Projects A National Effort to Introduce New Technology into...

89

High temperature size selective membranes  

DOE Green Energy (OSTI)

The objective of this research is to develop a high temperature size selective membrane capable of separating gas mixture components from each other based on molecular size, using a molecular sieving mechanism. The authors are evaluating two concepts: a composite of a carbon molecular sieve (CMS) with a tightly defined pore size distribution between 3 and 4 {angstrom}, and a microporous supporting matrix which provides mechanical strength and resistance to thermal degradation, and a sandwich of a CMS film between the porous supports. The high temperature membranes the authors are developing can be used to replace the current low-temperature unit operations for separating gaseous mixtures, especially hydrogen, from the products of the water gas shift reaction at high temperatures. Membranes that have a high selectivity and have both thermal and chemical stability would improve substantially the economics of the coal gasification process. These membranes can also improve other industrial processes such as the ammonia production and oil reform processes where hydrogen separation is crucial. Results of tests on a supported membrane and an unsupported carbon film are presented.

Yates, S.F.; Zhou, S.J.; Anderson, D.J.; Til, A.E. van

1994-10-01T23:59:59.000Z

90

Electromagnetic Casimir Forces of Parabolic Cylinder and Knife-Edge Geometries  

E-Print Network (OSTI)

An exact calculation of electromagnetic scattering from a perfectly conducting parabolic cylinder is employed to compute Casimir forces in several configurations. These include interactions between a parabolic cylinder and a plane, two parabolic cylinders, and a parabolic cylinder and an ordinary cylinder. To elucidate the effect of boundaries, special attention is focused on the "knife-edge" limit in which the parabolic cylinder becomes a half-plane. Geometrical effects are illustrated by considering arbitrary rotations of a parabolic cylinder around its focal axis, and arbitrary translations perpendicular to this axis. A quite different geometrical arrangement is explored for the case of an ordinary cylinder placed in the interior of a parabolic cylinder. All of these results extend simply to nonzero temperatures.

Noah Graham; Alexander Shpunt; Thorsten Emig; Sahand Jamal Rahi; Robert L. Jaffe; Mehran Kardar

2011-03-30T23:59:59.000Z

91

Electromagnetic Casimir forces of parabolic cylinder and knife-edge geometries  

SciTech Connect

An exact calculation of electromagnetic scattering from a perfectly conducting parabolic cylinder is employed to compute Casimir forces in several configurations. These include interactions between a parabolic cylinder and a plane, two parabolic cylinders, and a parabolic cylinder and an ordinary cylinder. To elucidate the effect of boundaries, special attention is focused on the 'knife-edge' limit in which the parabolic cylinder becomes a half-plane. Geometrical effects are illustrated by considering arbitrary rotations of a parabolic cylinder around its focal axis, and arbitrary translations perpendicular to this axis. A quite different geometrical arrangement is explored for the case of an ordinary cylinder placed in the interior of a parabolic cylinder. All of these results extend simply to nonzero temperatures.

Graham, Noah [Department of Physics, Middlebury College, Middlebury, Vermont 05753 (United States); Shpunt, Alexander; Kardar, Mehran [Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Emig, Thorsten [Laboratoire de Physique Theorique et Modeles Statistiques, CNRS UMR 8626, Bat. 100, Universite Paris-Sud, 91405 Orsay cedex (France); Rahi, Sahand Jamal [Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Center for Studies in Physics and Biology, The Rockefeller University, 1230 York Street, New York, New York 10065 (United States); Jaffe, Robert L. [Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States); Center for Theoretical Physics and Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)

2011-06-15T23:59:59.000Z

92

A Relation Between the Parabolic . . .  

E-Print Network (OSTI)

In this paper, we consider the weight i de Rham–Gauss–Manin bundles on a smooth variety arising from a smooth projective morphism f: XU ? ? U for i ? 0. We associate to each weight i de Rham bundle, a certain parabolic bundle on S and consider their parabolic Chern characters in the rational Chow groups, for a good compactification S of U. We show the triviality of the alternating sum of these parabolic bundles in the (positive degree) rational Chow groups. This removes the hypothesis of semistable reduction in the original result of this kind due to Esnault and Viehweg.

Jaya NN Iyer; Carlos T. Simpson

2006-01-01T23:59:59.000Z

93

Parabolic subgroups of Garside groups  

E-Print Network (OSTI)

A Garside monoid is a cancellative monoid with a finite lattice generating set; a Garside group is the group of fractions of a Garside monoid. The family of Garside groups contains the Artin-Tits groups of spherical type. We generalise the well-known notion of a parabolic subgroup of an Artin-Tits group into that of a parabolic subgroup of a Garside group. We also define the more general notion of a Garside subgroup of a Garside group, which is related to the notion of LCMhomomorphisms between Artin-Tits groups. We prove that most of the properties of parabolic subgroups extend to this subgroups.

Eddy Godelle

2008-01-01T23:59:59.000Z

94

KSTABILITY AND PARABOLIC STABILITY YANN ROLLIN  

E-Print Network (OSTI)

K­STABILITY AND PARABOLIC STABILITY YANN ROLLIN Abstract. Parabolic structures with rational that the three notions of parabolic polystability, K­polystability and existence of constant sca­ lar curvature K, we study iterated blowups of ruled surfaces encoded by a parabolic structure. Our main result, stated

Paris-Sud XI, Université de

95

STUDIA MATHEMATICA 193 (3) (2009) On the parabolic-elliptic limit of the doubly parabolic  

E-Print Network (OSTI)

STUDIA MATHEMATICA 193 (3) (2009) On the parabolic-elliptic limit of the doubly parabolic Keller, of solu- tions of the parabolic-parabolic Keller­Segel system in the plane to the corresponding solutions of the parabolic-elliptic model, as a physical parameter goes to zero. Our main tools are suitable space

Pujo-Menjouet, Laurent

96

On the parabolic-elliptic limit of the doubly parabolic KellerSegel system  

E-Print Network (OSTI)

On the parabolic-elliptic limit of the doubly parabolic Keller­Segel system modelling chemotaxis convergence results, in strong topologies, for so- lutions of the parabolic-parabolic Keller­Segel system in the plane, to the corresponding solutions of the parabolic-elliptic model, as a phys- ical parameter goes

Paris-Sud XI, Université de

97

MODULI SPACES OF PARABOLIC HIGGS BUNDLES AND PARABOLIC K(D) PAIRS OVER SMOOTH CURVES: I  

E-Print Network (OSTI)

MODULI SPACES OF PARABOLIC HIGGS BUNDLES AND PARABOLIC K(D) PAIRS OVER SMOOTH CURVES: I HANS U. BODEN AND K â?? OJI YOKOGAWA Abstract. This paper concerns the moduli spaces of rank two parabolic Higgs bundles and parabolic K(D) pairs over a smooth curve. Precisely which parabolic bundles occur in stable K

Boden, Hans U.

98

THE CHERN CHARACTER OF A PARABOLIC BUNDLE, AND A PARABOLIC COROLLARY OF REZNIKOV'S THEOREM  

E-Print Network (OSTI)

THE CHERN CHARACTER OF A PARABOLIC BUNDLE, AND A PARABOLIC COROLLARY OF REZNIKOV'S THEOREM JAYA NN character of a locally abelian parabolic bundle in terms of its constituent bundles. Several features and variants of parabolic structures are discussed. Parabolic bundles arising from logarithmic connections form

Iyer, Jaya N,

99

Experimental parabolic trough collector performance characterization  

DOE Green Energy (OSTI)

Experimental data from the Collector Module Test Facility (CMTF) at Sandia National Laboratories, Albuquerque, are used to develop a collector performance model and characterize three parabolic trough solar collectors. The independent variables used in the model are selected and fitted to the experimental data using a multiple linear regression technique. The collector model developed accounts for optical performance, including incident angle effects and thermal losses, both linear and non-linear.

Lukens, L.L.

1981-05-01T23:59:59.000Z

100

Technical and economic analysis of parabolic trough concentrating solar thermal power plant.  

E-Print Network (OSTI)

??Includes abstract. This thesis reports on the technical and economic analysis of wet and dry cooling technologies of parabolic trough CSTP plant. This was done… (more)

Kariuki, Kibaara Samuel .

2012-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "include high-temperature parabolic" 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

CONFINEMENT OF HIGH TEMPERATURE PLASMA  

DOE Patents (OSTI)

The confinement of a high temperature plasma in a stellarator in which the magnetic confinement has tended to shift the plasma from the center of the curved, U-shaped end loops is described. Magnetic means are provided for counteracting this tendency of the plasma to be shifted away from the center of the end loops, and in one embodiment this magnetic means is a longitudinally extending magnetic field such as is provided by two sets of parallel conductors bent to follow the U-shaped curvature of the end loops and energized oppositely on the inside and outside of this curvature. (AEC)

Koenig, H.R.

1963-05-01T23:59:59.000Z

102

HIGH TEMPERATURE SUPERCONDUCTORS-SYNTHESIS ... - TMS  

Science Conference Proceedings (OSTI)

... Anaheim, California. HIGH TEMPERATURE SUPERCONDUCTORS- SYNTHESIS, PROCESSING, AND LARGE SCALE APPLICATIONS VII: Characterization ...

103

HIGH TEMPERATURE SUPERCONDUCTORS: III: YBCO Conductor ...  

Science Conference Proceedings (OSTI)

HIGH TEMPERATURE SUPERCONDUCTORS: Session III: YBCO Conductor Development. Sponsored by: Jt: EMPMD/SMD Superconducting Materials ...

104

Hydrogen production from high temperature electrolysis and fusion reactor  

SciTech Connect

Production of hydrogen from high temperature electrolysis of steam coupled with a fusion reactor is studied. The process includes three major components: the fusion reactor, the high temperature electrolyzer and the power conversion cycle each of which is discussed in the paper. Detailed process design and analysis of the system is examined. A parametric study on the effect of process efficiency is presented.

Dang, V.D.; Steinberg, J.F.; Issacs, H.S.; Lazareth, O.; Powell, J.R.; Salzano, F.J.

1978-01-01T23:59:59.000Z

105

Courant Algebroids in Parabolic Geometry  

E-Print Network (OSTI)

Let $p$ be a Lie subalgebra of a semisimple Lie algebra $g$ and $(G,P)$ be the corresponding pair of connected Lie groups. A Cartan geometry of type $(G,P)$ associates to a smooth manifold $M$ a principal $P$-bundle and a Cartan connection, and a parabolic geometry is a Cartan geometry where $P$ is parabolic. We show that if $P$ is parabolic, the adjoint tractor bundle of a Cartan geometry, which is isomorphic to the Atiyah algebroid of the principal $P$-bundle, admits the structure of a (pre-)Courant algebroid, and we identify the topological obstruction to the bracket being a Courant bracket. For semisimple $G$, the Atiyah algebroid of the principal $P$-bundle associated to the Cartan geometry of $(G,P)$ admits a pre-Courant algebroid structure if and only if $P$ is parabolic.

Stuart Armstrong; Rongmin Lu

2011-12-29T23:59:59.000Z

106

The Parabolic-Trigonometric Functions  

E-Print Network (OSTI)

The parabolic functions are introduced in analogy to the circular and hyperbolic cases. We discuss the relevant properties, the geometrical interpretation and touch on possible generalizations and their link with the modular elliptic functions.

G. Dattoli; M. Migliorati; M. Quattromini; P. E. Ricci

2011-02-08T23:59:59.000Z

107

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

108

High temperature nuclear gas turbine  

SciTech Connect

Significance of gas turbine cycle, process of the development of gas turbines, cycle and efficiency of high-temperature gas turbines, history of gas turbine plants and application of nuclear gas turbines are described. The gas turbines are directly operated by the heat from nuclear plants. The gas turbines are classified into two types, namely open cycle and closed cycle types from the point of thermal cycle, and into two types of internal combustion and external combustion from the point of heating method. The hightemperature gas turbines are tbe type of internal combustion closed cycle. Principle of the gas turbines of closed cycle and open cycle types is based on Brayton, Sirling, and Ericsson cycles. Etficiency of the turbines is decided only by pressure ratio, and is independent of gas temperature. An example of the turbine cycle for the nuclear plant Gestacht II is explained. The thermal efficiency of that plant attains 37%. Over the gas temperature of about 750 deg C, the thermal efficiency of the gas turbine cycle is better than that of steam turbine cycle. As the nuclear fuel, coated particle fuel is used, and this can attain higher temperature of core outlet gas. Direct coupling of the nuclear power plants and the high temperature gas turbines has possibility of the higher thermal efficiency. (JA)

Kurosawa, A.

1973-01-01T23:59:59.000Z

109

Joint Institute for High Temperatures  

National Nuclear Security Administration (NNSA)

Joint Institute for High Temperatures of Russian Academy of Sciences Moscow Institute of Physics and Technology Extended title Extended title Excited state of warm dense matter or Exotic state of warm dense matter or Novel form of warm dense matter or New form of plasma Three sources of generation similarity: solid state density, two temperatures: electron temperature about tens eV, cold ions keep original crystallographic positions, but electron band structure and phonon dispersion are changed, transient but steady (quasi-stationary for a short time) state of non-equilibrium, uniform plasmas (no reference to non-ideality, both strongly and weakly coupled plasmas can be formed) spectral line spectra are emitted by ion cores embedded in plasma environment which influences the spectra strongly,

110

High temperature solid electrolyte fuel cell configurations and interconnections  

DOE Patents (OSTI)

High temperature fuel cell configurations and interconnections are made including annular cells having a solid electrolyte sandwiched between thin film electrodes. The cells are electrically interconnected along an elongated axial outer surface.

Isenberg, Arnold O. (Forest Hills, PA)

1984-01-01T23:59:59.000Z

111

Recent Developments in High Temperature Superconductivity  

E-Print Network (OSTI)

New material systems and the experimental progress of high temperature superconductivity are briefly reviewed. We examine both oxides and non-oxides which exhibit stable and/or unstable superconductivity at high temperatures.

Hor, P. H.

1988-09-01T23:59:59.000Z

112

High-temperature thermocouples and related methods  

DOE Patents (OSTI)

A high-temperature thermocouple and methods for fabricating a thermocouple capable of long-term operation in high-temperature, hostile environments without significant signal degradation or shortened thermocouple lifetime due to heat induced brittleness.

Rempe, Joy L. (Idaho Falls, ID); Knudson, Darrell L. (Firth, ID); Condie, Keith G. (Idaho Falls, ID); Wilkins, S. Curt (Idaho Falls, ID)

2011-01-18T23:59:59.000Z

113

High Temperature Superconducting Underground Cable  

SciTech Connect

The purpose of this Project was to design, build, install and demonstrate the technical feasibility of an underground high temperature superconducting (HTS) power cable installed between two utility substations. In the first phase two HTS cables, 320 m and 30 m in length, were constructed using 1st generation BSCCO wire. The two 34.5 kV, 800 Arms, 48 MVA sections were connected together using a superconducting joint in an underground vault. In the second phase the 30 m BSCCO cable was replaced by one constructed with 2nd generation YBCO wire. 2nd generation wire is needed for commercialization because of inherent cost and performance benefits. Primary objectives of the Project were to build and operate an HTS cable system which demonstrates significant progress towards commercial progress and addresses real world utility concerns such as installation, maintenance, reliability and compatibility with the existing grid. Four key technical areas addressed were the HTS cable and terminations (where the cable connects to the grid), cryogenic refrigeration system, underground cable-to-cable joint (needed for replacement of cable sections) and cost-effective 2nd generation HTS wire. This was the world’s first installation and operation of an HTS cable underground, between two utility substations as well as the first to demonstrate a cable-to-cable joint, remote monitoring system and 2nd generation HTS.

Farrell, Roger, A.

2010-02-28T23:59:59.000Z

114

Compact High-Temperature Superconducting Cable Wins ' ...  

Science Conference Proceedings (OSTI)

Compact High-Temperature Superconducting Cable Wins 'R&D 100' Award. From NIST Tech Beat: June 22, 2011. ...

2011-07-06T23:59:59.000Z

115

High temperature electronics application in well logging  

DOE Green Energy (OSTI)

Some limitations, problems, and needs are briefly reviewed for neutron logging tools used in high-temperature geothermal environments. (ACR)

Traeger, R.K.; Lysne, P.C.

1987-01-01T23:59:59.000Z

116

High Temperature Strain Gages for SOFC Application  

DOE Green Energy (OSTI)

This presentation discusses the investigation/extension of high temperature strain gage applications sensors to SOFC applications.

Pineault, R.L.; Johnson, C.; Gemmen, R.S.; Gregory, O.; You, T.

2005-01-27T23:59:59.000Z

117

HIGH TEMPERATURE SUPERCONDUCTORS: IV: BSCCO and ...  

Science Conference Proceedings (OSTI)

HIGH TEMPERATURE SUPERCONDUCTORS: Session IV: BSCCO and TBCCO Conductor Development. Sponsored by: Jt. EMPMD/SMD Superconducting ...

118

Development and Testing of High-Temperature Solar Selective Coatings  

DOE Green Energy (OSTI)

The Solar Energy Technologies Program is working to reduce the cost of parabolic trough solar power technology. System studies show that increasing the operating temperature of the solar field from 390 to >450 C will result in improved performance and cost reductions. This requires the development of new more-efficient selective coatings that have both high solar absorptance (>0.96) and low thermal emittance (<0.07) and are thermally stable above 450 C, ideally in air. Potential selective coatings were modeled, identified for laboratory prototyping, and manufactured at NREL. Optimization of the samples and high-temperature durability testing will be performed. Development of spectrally selective materials depends on reliable characterization of their optical properties. Protocols for testing the thermal/optical properties of selective coatings were developed and a round-robin experiment was conducted to verify and document the reflectance and high-temperature emittance measurements. The development, performance, and durability of these materials and future work will be described.

Kennedy, C.; Price, H.

2005-01-01T23:59:59.000Z

119

Shenandoah parabolic dish solar collector  

DOE Green Energy (OSTI)

The objectives of the Shenandoah, Georgia, Solar Total Energy System are to design, construct, test, and operate a solar energy system to obtain experience with large-scale hardware systems for future applications. This report describes the initial design and testing activities conducted to select and develop a collector that would serve the need of such a solar total energy system. The parabolic dish was selected as the collector most likely to maximize energy collection as required by this specific site. The fabrication, testing, and installation of the parabolic dish collector incorporating improvements identified during the development testing phase are described.

Kinoshita, G.S.

1985-01-01T23:59:59.000Z

120

SunShot Initiative: Parabolic Trough  

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

development (R&D) in parabolic trough systems as one of four concentrating solar power (CSP) technologies aiming to meet the goals of the SunShot Initiative. Parabolic troughs,...

Note: This page contains sample records for the topic "include high-temperature parabolic" 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

THE STRUCTURE OF TWO-PARABOLIC SPACE: PARABOLIC DUST AND ITERATION.  

E-Print Network (OSTI)

THE STRUCTURE OF TWO-PARABOLIC SPACE: PARABOLIC DUST AND ITERATION. JANE GILMAN Abstract. A non-elementary M¨obius group generated by two- parabolics is determined up to conjugation by one complex para] to obtain an additional struc- ture for the parameter space, which we term the two-parabolic space

Gilman, Jane

122

PARABOLIC SCHEMES FOR QUASI-LINEAR PARABOLIC AND HYPERBOLIC PDES VIA STOCHASTIC CALCULUS  

E-Print Network (OSTI)

PARABOLIC SCHEMES FOR QUASI-LINEAR PARABOLIC AND HYPERBOLIC PDES VIA STOCHASTIC CALCULUS SEBASTIEN of a unique global strong solution for the parabolic system. We show the existence of a unique local strong not use weak solution theory but recursive parabolic schemes studied via a stochastic approach

Paris-Sud XI, Université de

123

AN ABSTRACT APPROACH TO DOMAIN PERTURBATION FOR PARABOLIC EQUATIONS AND PARABOLIC  

E-Print Network (OSTI)

AN ABSTRACT APPROACH TO DOMAIN PERTURBATION FOR PARABOLIC EQUATIONS AND PARABOLIC VARIATIONAL Australia Abstract. We study the behaviour of solutions of linear non-autonomous parabolic equations subject of func- tion spaces for non-autonomous parabolic problems is equivalent to Mosco convergence of function

Sydney, University of

124

Ultra High Temperature | Open Energy Information  

Open Energy Info (EERE)

Ultra High Temperature Ultra High Temperature Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Sanyal Temperature Classification: Ultra High Temperature Dictionary.png Ultra High Temperature: No definition has been provided for this term. Add a Definition Sanyal Temp Classification This temperature scheme was developed by Sanyal in 2005 at the request of DOE and GEA, as reported in Classification of Geothermal Systems: A Possible Scheme. Extremely Low Temperature Very Low Temperature Low Temperature Moderate Temperature High Temperature Ultra High Temperature Steam Field Reservoir fluid greater than 300°C is considered by Sanyal to be "ultra high temperature". "Such reservoirs are characterized by rapid development of steam saturation in the reservoir and steam fraction in the mobile fluid phase upon

125

Threshold results for semilinear parabolic systems  

E-Print Network (OSTI)

A threshold result was proved in this paper for semilinear parabolic system with pure power type nonlinearities

Xie, Qiuyi Dai Haiyang He Junhui

2010-01-01T23:59:59.000Z

126

REGULARITY FOR A DOUBLY NONLINEAR PARABOLIC EQUATION  

E-Print Network (OSTI)

REGULARITY FOR A DOUBLY NONLINEAR PARABOLIC EQUATION JUHA KINNUNEN Abstract. This survey focuses on regularity results for certain degenerate doubly nonlinear parabolic equations in the case when the Lebesgue This note focuses on the regularity of nonnegative weak solutions to the doubly nonlinear parabolic equation

Kinnunen, Juha

127

Coupled Parabolic Equations for Wave Propagation  

E-Print Network (OSTI)

Coupled Parabolic Equations for Wave Propagation Kai Huang, Knut Solna and Hongkai Zhao #3; April 30, 2004 Abstract We develop an algorithm using two coupled parabolic equations for numerical simulation of wave propagation over long distances. The coupled parabolic equations are derived from a two

Zhao, Hongkai

128

The parabolic Mandelbrot set Pascale ROESCH  

E-Print Network (OSTI)

The parabolic Mandelbrot set Pascale ROESCH (joint work with C. L. PETERSEN, IMFUFA Roskilde) Institute of Mathematics of Toulouse 21 february 2011 Roesch P. (IMT) The parabolic Mandelbrot set 21 february 2011 1 / 94 #12;Consider a rational map of degree d 2 Roesch P. (IMT) The parabolic Mandelbrot

Roesch, Pascale

129

The near parabolic renormalization Inou and Shishikura  

E-Print Network (OSTI)

The near parabolic renormalization of Inou and Shishikura Arnaud Ch´eritat Institut de Math´ematiques de Toulouse Oberwolfach, April 2008 A. Ch´eritat (IMT) Near parabolic renormalization Oberwolfach, April 2008 1 / 19 #12;1 Renormalization in complex dynamics 2 The parabolic renormalization 3 Near

Chéritat, Arnaud

130

Degenerate Parabolic Stochastic Partial Differential Equations  

E-Print Network (OSTI)

Degenerate Parabolic Stochastic Partial Differential Equations Martina Hofmanov´a Abstract. We study the Cauchy problem for a scalar semilinear degenerate parabolic partial differential equation the notion of kinetic solution which is well suited for degenerate parabolic problems and supplies a good

Paris-Sud XI, Université de

131

Release Version Parabolic Dish Microphone System  

E-Print Network (OSTI)

Release Version Parabolic Dish Microphone System Prepared by: Zhixin Chen (Ph.D. Student), with the assistance of Robert C. Maher (Associate Professor) Montana State University A parabolic dish microphone is like a mirror telescope for sound. A parabolic reflector is used to collect and focus sound waves

Maher, Robert C.

132

Turbine vane with high temperature capable skins  

Science Conference Proceedings (OSTI)

A turbine vane assembly includes an airfoil extending between an inner shroud and an outer shroud. The airfoil can include a substructure having an outer peripheral surface. At least a portion of the outer peripheral surface is covered by an external skin. The external skin can be made of a high temperature capable material, such as oxide dispersion strengthened alloys, intermetallic alloys, ceramic matrix composites or refractory alloys. The external skin can be formed, and the airfoil can be subsequently bi-cast around or onto the skin. The skin and the substructure can be attached by a plurality of attachment members extending between the skin and the substructure. The skin can be spaced from the outer peripheral surface of the substructure such that a cavity is formed therebetween. Coolant can be supplied to the cavity. Skins can also be applied to the gas path faces of the inner and outer shrouds.

Morrison, Jay A. (Oviedo, FL)

2012-07-10T23:59:59.000Z

133

High Temperature Steam Electrolysis Materials Degradation: Preliminary Results of Corrosion Tests on Ceramatec Electrolysis Cell Components  

DOE Green Energy (OSTI)

Corrosion tests were performed on stainless steel and nickel alloy coupons in H2O/H2 mixtures and dry air to simulate conditions experienced in high temperature steam electrolysis systems. The stainless steel coupons were tested bare and with one of three different proprietary coatings applied. Specimens were corroded at 850°C for 500 h with weight gain data recorded at periodic intervals. Post-test characterization of the samples included surface and cross-section scanning electron microscopy, grazing incidence x-ray diffraction, and area-specific resistance measurements. The uncoated nickel alloy outperformed the ferritic stainless steel under all test conditions based on weight gain data. Parabolic rate constants for corrosion of these two uncoated alloys were consistent with values presented in the literature under similar conditions. The steel coatings reduced corrosion rates in H2O/H2 mixtures by as much as 50% compared to the untreated steel, but in most cases showed negligible corrosion improvement in air. The use of a rare-earth-based coating on stainless steel did not result in a significantly different area specific resistance values after corrosion compared to the untreated alloy. Characterization of the samples is still in progress and the findings will be revised when the complete data set is available.

Paul Demkowicz; Prateek Sachdev; Kevin DeWall; Pavel Medvedev

2007-06-01T23:59:59.000Z

134

Plane and parabolic solar panels  

E-Print Network (OSTI)

We present a plane and parabolic collector that absorbs radiant energy and transforms it in heat. Therefore we have a panel to heat water. We study how to increment this capture of solar beams onto the panel in order to increase its efficiency in heating water.

Sales, J H O

2009-01-01T23:59:59.000Z

135

Plane and parabolic solar panels  

E-Print Network (OSTI)

We present a plane and parabolic collector that absorbs radiant energy and transforms it in heat. Therefore we have a panel to heat water. We study how to increment this capture of solar beams onto the panel in order to increase its efficiency in heating water.

J. H. O. Sales; A. T. Suzuki

2009-05-14T23:59:59.000Z

136

Parabolic tapers for overmoded waveguides  

DOE Patents (OSTI)

A waveguide taper with a parabolic profile, in which the distance along the taper axis varies as the square of the tapered dimension, provides less mode conversion than equal length linear tapers and is easier to fabricate than other non-linear tapers.

Doane, J.L.

1983-11-25T23:59:59.000Z

137

Research on Very High Temperature Gas Reactors  

Science Conference Proceedings (OSTI)

Very high temperature gas reactors are helium-cooled, graphite-moderated advanced reactors that show potential for generating low-cost electricity via gas turbines or cogeneration with process-heat applications. This investigation addresses the development status of advanced coatings for nuclear-fuel particles and high-temperature structural materials and evaluates whether these developments are likely to lead to economically competitive applications of the very high temperature gas reactor concept.

1991-08-08T23:59:59.000Z

138

High Temperature Corrosion Test Facilities and High Pressure Test  

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

High Temperature High Temperature Corrosion Test Facilities and High Pressure Test Facilities for Metal Dusting Test Facilities for Metal Dusting Overview Other Facilities Work with Argonne Contact us For Employees Site Map Help Join us on Facebook Follow us on Twitter NE on Flickr High Temperature Corrosion Test Facilities and High Pressure Test Facilities for Metal Dusting Six corrosion test facilities and two thermogravimetric systems for conducting corrosion tests in complex mixed gas environments, in steam and in the presence of deposits, and five facilities for metal dusting degradation Bookmark and Share The High Temperature Corrosion Test Facilities and High Pressure Test Facilities for Metal Dusting include: High Pressure Test Facility for Metal Dusting Resistance:

139

Thermodynamics and Transport Phenomena in High Temperature Steam Electrolysis Cells  

DOE Green Energy (OSTI)

Hydrogen can be produced from water splitting with relatively high efficiency using high temperature electrolysis. This technology makes use of solid-oxide cells, running in the electrolysis mode to produce hydrogen from steam, while consuming electricity and high temperature process heat. The overall thermal-to-hydrogen efficiency for high temperature electrolysis can be as high as 50%, which is about double the overall efficiency of conventional low-temperature electrolysis. Current large-scale hydrogen production is based almost exclusively on steam reforming of methane, a method that consumes a precious fossil fuel while emitting carbon dioxide to the atmosphere. An overview of high temperature electrolysis technology will be presented, including basic thermodynamics, experimental methods, heat and mass transfer phenomena, and computational fluid dynamics modeling.

James E. O'Brien

2012-03-01T23:59:59.000Z

140

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

Note: This page contains sample records for the topic "include high-temperature parabolic" 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

Improved Martensitic Steel for High Temperature Applications  

NETL has developed a stainless steel composition and heat treatment process for a high-temperature, titanium alloyed 9 Cr-1 molybdenum alloy ...

142

Experiment Hazard Class 3 - High Temperatures  

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

* RF and Microwave * UV Light Hydrogen * Hydrogen Electronics * Electrical Equipment * High Voltage Other * Other Class 3 - High Temperatures Applicability The hazard controls...

143

High-temperature brazed ceramic joints  

DOE Patents (OSTI)

High-temperature joints formed from metallized ceramics are disclosed wherein the metal coatings on the ceramics are vacuum sputtered thereon.

Jarvinen, Philip O. (Amherst, NH)

1986-01-01T23:59:59.000Z

144

Development of Inorganic High Temperature Proton Exchange ...  

Science Conference Proceedings (OSTI)

For fuel cell systems directly coupled to a reformer, the primary advantage of high temperatures is the elimination of CO poisoning. Direct methanol fuel cells ...

145

Recent Developments in High Temperature Superconductivity  

Science Conference Proceedings (OSTI)

Scope, Recently, significant progress has been made world-wide in both fabrication and fundamental understanding of high-temperature superconductors (HTS) ...

146

Thermodynamic and Kinetic Properties of High Temperature ...  

Science Conference Proceedings (OSTI)

Perspectives on Phonons and Electron-Phonon Scattering in High-Temperature Superconductors · Prediction and Design of Materials from Crystal Structures to ...

147

Universal estimate of the gradient for parabolic equations  

E-Print Network (OSTI)

We suggest a modification of the estimate for weighted Sobolev norms of solutions of parabolic equations such that the matrix of the higher order coefficients is included into the weight for the gradient. More precisely, we found the upper limit estimate that can be achieved by variations of the zero order coefficient. As an example of applications, an asymptotic estimate was obtained for the gradient at initial time. The constant in the estimates is the same for all possible choices of the dimension, domain, time horizon, and the coefficients of the parabolic equation. As an another example of application, existence and regularity results are obtained for parabolic equations with time delay for the gradient.

Nikolai Dokuchaev

2007-09-06T23:59:59.000Z

148

Nonlocal Operators, Parabolic-type Equations, and Ultrametric Random Walks  

E-Print Network (OSTI)

In this article we introduce a new type of nonlocal operators and study the Cauchy problem for certain parabolic-type pseudodifferential equations naturally associated to these operators. Some of these equations are the p-adic master equations of certain models of complex systems introduced by Avetisov et al. The fundamental solutions of these parabolic-type equations are transition functions of random walks on the n-dimensional vector space over the field of p-adic numbers. We study some properties of these random walks, including the first passage time.

L. F. Chacón-Cortes; W. A. Zúñiga-Galindo

2013-08-22T23:59:59.000Z

149

High-temperature electronics: an overview  

DOE Green Energy (OSTI)

A summary is presented providing an overview of contemporary high-temperature electronics and identifying the major areas where developments are needed and the laboratories where research is being conducted. The geothermal program, high-temperature oil and gas well logging, jet engine monitors, and circuits for operation in the sodium coolant loop of the Clinch River Breeder reactor have stimulated research. (FS)

Heckman, R.C.

1979-01-01T23:59:59.000Z

150

High Temperature Electrochemistry Center - HiTEC  

DOE Green Energy (OSTI)

This presentation discusses the High Temperature Electrochemistry Center (HiTEC). The mission of HiTEC is to advance the solid oxide technology, such as solid oxide, high temperature electrolysers, reversible fuel cells, energy storage devices, proton conductors, etc., for use in DG and FutureGen applications, and to conduct fundamental research that aids the general development of all solid oxide technology.

McVay, G.; Williams, M.

2005-01-27T23:59:59.000Z

151

Method of manufacturing a high temperature superconductor with improved transport properties  

DOE Patents (OSTI)

A method of preparing a high temperature superconductor. A method of preparing a superconductor includes providing a powdered high temperature superconductor and a nanophase paramagnetic material. These components are combined to form a solid compacted mass with the paramagnetic material disposed on the grain boundaries of the polycrystaline high temperature superconductor.

Balachandran, Uthamalingam (Hinsdale, IL); Siegel, Richard W. (Hinsdale, IL); Askew, Thomas R. (Kalamazoo, MI)

2001-01-01T23:59:59.000Z

152

Symposium on high temperature and materials chemistry  

SciTech Connect

This volume contains the written proceedings of the Symposium on High Temperature and Materials Chemistry held in Berkeley, California on October 24--25, 1989. The Symposium was sponsored by the Materials and Chemical Sciences Division of Lawrence Berkeley Laboratory and by the College of Chemistry of the University of California at Berkeley to discuss directions, trends, and accomplishments in the field of high temperature and materials chemistry. Its purpose was to provide a snapshot of high temperature and materials chemistry and, in so doing, to define status and directions.

1989-10-01T23:59:59.000Z

153

High Temperature Borehole Televiewer software user manual  

DOE Green Energy (OSTI)

The High Temperature Borehole Televiewer is a downhole instrument which provides acoustic pictures of the borehole walls that are suitable for casing inspection and fracture detection in geothermal wells. The Geothermal Drilling Organization has funded the development of a commercial tool survivable to temperatures of 275{degree}C and pressures of 5000 psi. A real-time display on an IBM-compatible PC was included as part of the development effort. This report contains a User Manual which describes the operation of this software. The software is designed in a menu format allowing the user to change many of the parameters which control both the acquisition and the display of the Televiewer data. An internal data acquisition card digitizes the waveform from the tool at a rate of 100,000 samples per second. The data from the tool, both the range or arrival time and the amplitude of the return signal, are displayed in color on the CRT screen of the computer during the logging operation. This data may be stored on the hard disk for later display and analysis. The software incorporates many features which aid in the setup of the tool for proper operation. These features include displaying and storing the captured waveform data to check the voltage and time windows selected by the user. 17 refs., 28 figs., 15 tabs.

Duda, L.E.

1989-11-01T23:59:59.000Z

154

Parabolic systems and an underlying Lagrangian.  

E-Print Network (OSTI)

??In this thesis, we extend De Giorgi's interpolation method to a class of parabolic equations which are not gradient flows but possess an entropy functional… (more)

Yolcu, Türkay

2009-01-01T23:59:59.000Z

155

Parabolic Weingarten surfaces in hyperbolic space  

E-Print Network (OSTI)

A surface in hyperbolic space $\\h^3$ invariant by a group of parabolic isometries is called a parabolic surface. In this paper we investigate parabolic surfaces of $\\h^3$ that satisfy a linear Weingarten relation of the form $a\\kappa_1+b\\kappa_2=c$ or $aH+bK=c$, where $a,b,c\\in \\r$ and, as usual, $\\kappa_i$ are the principal curvatures, $H$ is the mean curvature and $K$ is de Gaussian curvature. We classify all parabolic linear Weingarten surfaces in hyperbolic space.

López, Rafael

2008-01-01T23:59:59.000Z

156

Parabolic equations without a minimum principle.  

E-Print Network (OSTI)

??In this thesis, we consider several parabolic equations for which the minimum principle fails. We first consider a two-point boundary value problem for a one… (more)

Pang, Huadong

2007-01-01T23:59:59.000Z

157

Performance of a parabolic trough solar collector.  

E-Print Network (OSTI)

??Parabolic trough solar collectors (PTSCs) constitute a proven source of thermal energy for industrial process heat and power generation, although their implementation has been strongly… (more)

Brooks, Michael John

2005-01-01T23:59:59.000Z

158

THE PARABOLIC-PARABOLIC KELLER-SEGEL SYSTEM WITH CRITICAL DIFFUSION AS A GRADIENT FLOW IN Rd  

E-Print Network (OSTI)

THE PARABOLIC-PARABOLIC KELLER-SEGEL SYSTEM WITH CRITICAL DIFFUSION AS A GRADIENT FLOW IN Rd , d 3 ADRIEN BLANCHET1 AND PHILIPPE LAURENC¸OT2 Abstract. It is known that, for the parabolic-elliptic Keller for the parabolic-parabolic Keller-Segel system with critical porous-medium type diffusion in dimension Rd , d 3

Paris-Sud XI, Université de

159

Bibliography Parabolic Geometries and Weyl connections Nearly invariant calculus (Wunsch's) nearly invariant calculus for parabolic  

E-Print Network (OSTI)

Bibliography Parabolic Geometries and Weyl connections Nearly invariant calculus (W¨unsch's) nearly invariant calculus for parabolic geometries Jan Slov´ak Masaryk University, Brno, Czech Republic joint work;Bibliography Parabolic Geometries and Weyl connections Nearly invariant calculus Structure 1 Bibliography 2

Olver, Peter

160

ON CARLEMAN ESTIMATES FOR ELLIPTIC AND PARABOLIC OPERATORS. APPLICATIONS TO UNIQUE CONTINUATION AND CONTROL OF PARABOLIC  

E-Print Network (OSTI)

ON CARLEMAN ESTIMATES FOR ELLIPTIC AND PARABOLIC OPERATORS. APPLICATIONS TO UNIQUE CONTINUATION AND CONTROL OF PARABOLIC EQUATIONS J´ER ^OME LE ROUSSEAU AND GILLES LEBEAU Abstract. Local and global Carleman and parabolic operators by means of semi-classical microlocal techniques. Optimality results for these estimates

Paris-Sud XI, Université de

Note: This page contains sample records for the topic "include high-temperature parabolic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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161

Live Work on High Temperature Conductors  

Science Conference Proceedings (OSTI)

Feedback from field personnel working with high-temperature conductors indicates that when a dead-end compression yoke assembly (DCYA) is installed on the conductor according to normal utility procedures, the soft aluminum strands are deformed and "birdcage." This is of course a concern to the field crews and the utility operating the line. This report presents results of research and tests performed on selected conductors operating at high temperature (approximately 250-260°C) with selected live wor...

2011-12-13T23:59:59.000Z

162

Parabolic Deligne-Lusztig varieties  

E-Print Network (OSTI)

Motivated by the Brou\\'e conjecture on blocks with abelian defect groups for finite reductive groups, we study "parabolic" Deligne-Lusztig varieties and construct on those which occur in the Brou\\'e conjecture an action of a braid monoid, whose action on their $\\ell$-adic cohomology will conjecturally factor trough a cyclotomic Hecke algebra. In order to construct this action, we need to enlarge the set of varieties we consider to varieties attached to a "ribbon category"; this category is a {\\em Garside category}, which plays an important role in our proof, so we devote the first part of our paper to the necessary background on Garside categories.

Digne, François

2011-01-01T23:59:59.000Z

163

PARABOLIC COMPARISON PRINCIPLE AND QUASIMINIMIZERS IN METRIC MEASURE SPACES  

E-Print Network (OSTI)

PARABOLIC COMPARISON PRINCIPLE AND QUASIMINIMIZERS IN METRIC MEASURE SPACES JUHA KINNUNEN AND MATHIAS MASSON Abstract. We give several characterizations of parabolic (quasisuper)- minimizers prove a version of com- parison principle for super- and subminimizers on parabolic space-time cylinders

Kinnunen, Juha

164

A discrete BGK approximation for strongly degenerate parabolic problems  

E-Print Network (OSTI)

A discrete BGK approximation for strongly degenerate parabolic problems with boundary conditions F strongly degenerate hyperbolic--parabolic equations with initial boundary condition. We prove a priori -- strongly degenerate parabolic equations -- singular perturbation problems -- BGK models 1 Introduction

165

A Note on Parabolic Subgroups of a Coxeter Group  

E-Print Network (OSTI)

The aim of this note is to prove that the parabolic closure of any subset of a Coxeter group is a parabolic subgroup. To obtain that, several technical lemmas on the root system of a parabolic subgroup are established.

Dongwen Qi

2008-01-01T23:59:59.000Z

166

Scaling Studies for High Temperature Test Facility and Modular High Temperature Gas-Cooled Reactor  

SciTech Connect

The Oregon State University (OSU) High Temperature Test Facility (HTTF) is an integral experimental facility that will be constructed on the OSU campus in Corvallis, Oregon. The HTTF project was initiated, by the U.S. Nuclear Regulatory Commission (NRC), on September 5, 2008 as Task 4 of the 5-year High Temperature Gas Reactor Cooperative Agreement via NRC Contract 04-08-138. Until August, 2010, when a DOE contract was initiated to fund additional capabilities for the HTTF project, all of the funding support for the HTTF was provided by the NRC via their cooperative agreement. The U.S. Department of Energy (DOE) began their involvement with the HTTF project in late 2009 via the Next Generation Nuclear Plant (NGNP) project. Because the NRC's interests in HTTF experiments were only centered on the depressurized conduction cooldown (DCC) scenario, NGNP involvement focused on expanding the experimental envelope of the HTTF to include steady-state operations and also the pressurized conduction cooldown (PCC).

Richard R. Schult; Paul D. Bayless; Richard W. Johnson; James R. Wolf; Brian Woods

2012-02-01T23:59:59.000Z

167

Method for high temperature mercury capture from gas streams  

DOE Patents (OSTI)

A process to facilitate mercury extraction from high temperature flue/fuel gas via the use of metal sorbents which capture mercury at ambient and high temperatures. The spent sorbents can be regenerated after exposure to mercury. The metal sorbents can be used as pure metals (or combinations of metals) or dispersed on an inert support to increase surface area per gram of metal sorbent. Iridium and ruthenium are effective for mercury removal from flue and smelter gases. Palladium and platinum are effective for mercury removal from fuel gas (syngas). An iridium-platinum alloy is suitable for metal capture in many industrial effluent gas streams including highly corrosive gas streams.

Granite, E.J.; Pennline, H.W.

2006-04-25T23:59:59.000Z

168

Steam generation in compound parabolic concentrator collectors  

SciTech Connect

This report describes the advantages of generating steam directly in a nonimaging compound parabolic concentrator (CPC) collector rather than using a heat-transfer fluid and a secondary heat exchanger. The predicted performance advantages from generating steam directly in CPC collectors are significant, and that performance has ben verified using a collector built and tested at Argonne National Laboratory. The collector and the method used to test its operation in a steam-generating mode are described. Test results are included for a 6.4-m/sup 2/ array of evacuated tube collectors with an advanced absorber coating, silver reflectors, and tubes oriented in a north-south configuration. Also described are the test methods and results for indoor testing for heat loss by the collectors and outdoor testing of their instantaneous optical efficiency.

Allen, J.W.; Schertz, W.W.; Wantroba, A.S.

1985-08-01T23:59:59.000Z

169

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

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

Parabolic Trough Power Plant Market, Economic Assessment and Deployment Parabolic trough technology is the most commercially mature, large-scale solar power technology in the...

170

Concept of a thermonuclear reactor based on gravity retention of high-temperature plasma  

E-Print Network (OSTI)

In the present paper the realization of the obtained results in relation to the dense high- temperature plasma of multivalent ions including experimental data interpretation is discussed.

S. I. Fisenko; I. S. Fisenko

2007-05-27T23:59:59.000Z

171

High Temperature Cements | Open Energy Information  

Open Energy Info (EERE)

High Temperature Cements High Temperature Cements Jump to: navigation, search Geothermal ARRA Funded Projects for High Temperature Cements Loading map... {"format":"googlemaps3","type":"ROADMAP","types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"limit":200,"offset":0,"link":"all","sort":[""],"order":[],"headers":"show","mainlabel":"","intro":"","outro":"","searchlabel":"\u2026 further results","default":"","geoservice":"google","zoom":false,"width":"600px","height":"350px","centre":false,"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":"","icon":"","visitedicon":"","forceshow":true,"showtitle":true,"hidenamespace":false,"template":false,"title":"","label":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"locations":[{"text":"

172

High Temperature Membrane & Advanced Cathode Catalyst Development  

DOE Green Energy (OSTI)

Current project consisted of three main phases and eighteen milestones. Short description of each phase is given below. Table 1 lists program milestones. Phase 1--High Temperature Membrane and Advanced Catalyst Development. New polymers and advanced cathode catalysts were synthesized. The membranes and the catalysts were characterized and compared against specifications that are based on DOE program requirements. The best-in-class membranes and catalysts were downselected for phase 2. Phase 2--Catalyst Coated Membrane (CCM) Fabrication and Testing. Laboratory scale catalyst coated membranes (CCMs) were fabricated and tested using the down-selected membranes and catalysts. The catalysts and high temperature membrane CCMs were tested and optimized. Phase 3--Multi-cell stack fabrication. Full-size CCMs with the down-selected and optimized high temperature membrane and catalyst were fabricated. The catalyst membrane assemblies were tested in full size cells and multi-cell stack.

Protsailo, Lesia

2006-04-20T23:59:59.000Z

173

Initial stages of high temperature metal oxidation  

Science Conference Proceedings (OSTI)

The application of XPS and UPS to the study of the initial stages of high temperature (> 350/sup 0/C) electrochemical oxidation of iron and nickel is discussed. In the high temperature experiments, iron and nickel electrodes were electrochemically oxidized in contact with a solid oxide electrolyte in the uhv system. The great advantages of this technique are that the oxygen activity at the interface may be precisely controlled and the ability to run the reactions in uhv allows the simultaneous observation of the reactions by XPS.

Yang, C.Y.; O'Grady, W.E.

1981-01-01T23:59:59.000Z

174

High temperature crystalline superconductors from crystallized glasses  

DOE Patents (OSTI)

A method of preparing a high temperature superconductor from an amorphous phase. The method involves preparing a starting material of a composition of Bi.sub.2 Sr.sub.2 Ca.sub.3 Cu.sub.4 Ox or Bi.sub.2 Sr.sub.2 Ca.sub.4 Cu.sub.5 Ox, forming an amorphous phase of the composition and heat treating the amorphous phase for particular time and temperature ranges to achieve a single phase high temperature superconductor.

Shi, Donglu (Downers Grove, IL)

1992-01-01T23:59:59.000Z

175

Fusion blanket high-temperature heat transfer  

DOE Green Energy (OSTI)

Deep penetration of 14 MeV neutrons makes two-temperature region blankets feasible. A relatively low-temperature (approx. 300/sup 0/C) metallic structure is the vacuum/coolant pressure boundary, while the interior of the blanket, which is a simple packed bed of nonstructural material, operates at very high temperatures (>1000/sup 0/C). The water-cooled shell structure is thermally insulated from the steam-cooled interior. High-temperature steam can dramatically increase the efficiency of electric power generation, as well as produce hydrogen and oxygen-based synthetic fuels at high-efficiency.

Fillo, J.A.

1983-01-01T23:59:59.000Z

176

Optical Fiber High Temperature Sensor Instrumentation for Energy Intensive Industries  

SciTech Connect

This report summarizes technical progress during the program “Optical Fiber High Temperature Sensor Instrumentation for Energy Intensive Industries”, performed by the Center for Photonics Technology of the Bradley Department of Electrical and Computer Engineering at Virginia Tech. The objective of this program was to use technology recently invented at Virginia Tech to develop and demonstrate the application of self-calibrating optical fiber temperature and pressure sensors to several key energy-intensive industries where conventional, commercially available sensors exhibit greatly abbreviated lifetimes due primarily to environmental degradation. A number of significant technologies were developed under this program, including • a laser bonded silica high temperature fiber sensor with a high temperature capability up to 700°C and a frequency response up to 150 kHz, • the world’s smallest fiber Fabry-Perot high temperature pressure sensor (125 x 20 ?m) with 700°C capability, • UV-induced intrinsic Fabry-Perot interferometric sensors for distributed measurement, • a single crystal sapphire fiber-based sensor with a temperature capability up to 1600°C. These technologies have been well demonstrated and laboratory tested. Our work plan included conducting major field tests of these technologies at EPRI, Corning, Pratt & Whitney, and Global Energy; field validation of the technology is critical to ensuring its usefulness to U.S. industries. Unfortunately, due to budget cuts, DOE was unable to follow through with its funding commitment to support Energy Efficiency Science Initiative projects and this final phase was eliminated.

Cooper, Kristie L.; Wang, Anbo; Pickrell, Gary R.

2006-11-14T23:59:59.000Z

177

ANALYSIS OF A HIGH TEMPERATURE GAS-COOLED REACTOR POWERED HIGH TEMPERATURE ELECTROLYSIS HYDROGEN PLANT  

DOE Green Energy (OSTI)

An updated reference design for a commercial-scale high-temperature electrolysis (HTE) plant for hydrogen production has been developed. The HTE plant is powered by a high-temperature gas-cooled reactor (HTGR) whose configuration and operating conditions are based on the latest design parameters planned for the Next Generation Nuclear Plant (NGNP). The current HTGR reference design specifies a reactor power of 600 MWt, with a primary system pressure of 7.0 MPa, and reactor inlet and outlet fluid temperatures of 322°C and 750°C, respectively. The reactor heat is used to produce heat and electric power to the HTE plant. A Rankine steam cycle with a power conversion efficiency of 44.4% was used to provide the electric power. The electrolysis unit used to produce hydrogen includes 1.1 million cells with a per-cell active area of 225 cm2. The reference hydrogen production plant operates at a system pressure of 5.0 MPa, and utilizes a steam-sweep system to remove the excess oxygen that is evolved on the anode (oxygen) side of the electrolyzer. The overall system thermal-to-hydrogen production efficiency (based on the higher heating value of the produced hydrogen) is 42.8% at a hydrogen production rate of 1.85 kg/s (66 million SCFD) and an oxygen production rate of 14.6 kg/s (33 million SCFD). An economic analysis of this plant was performed with realistic financial and cost estimating The results of the economic analysis demonstrated that the HTE hydrogen production plant driven by a high-temperature helium-cooled nuclear power plant can deliver hydrogen at a competitive cost. A cost of $3.03/kg of hydrogen was calculated assuming an internal rate of return of 10% and a debt to equity ratio of 80%/20% for a reactor cost of $2000/kWt and $2.41/kg of hydrogen for a reactor cost of $1400/kWt.

M. G. McKellar; E. A. Harvego; A. M. Gandrik

2010-11-01T23:59:59.000Z

178

HALLIBURTON SPERRY-SUN DOE HIGH TEMPERATURE LWD PROJECT  

SciTech Connect

The objective of this project was to build a high temperature, cost-effective, logging while drilling (HT-LWD) system with the ability to operate at 175 C with more than 100 hours mean time between failures (MTBF). Such a commercial real-time formation evaluation (FE) system would help operators to drill and produce hydrocarbon resources from moderately deep, hot reservoirs which otherwise might be uneconomic to drill. The project plan was to combine the existing Sperry-Sun high temperature directional and gamma logging system with lower temperature FE sensors which were upgraded to higher temperature operation as part of the project. The project was to be completed in two phases. Phase I included the development of the HT system, building two complete systems, demonstrating operational capability at 175 C and survivability at 200 C in the laboratory, and successfully testing the system in two low temperature field tests. Phase II was to test the system in a well with a bottom hole temperature of 175 C. The high temperature FE sensors developed as part of this project include gamma ray (DGR), resistivity (EWR-Phase 4), neutron (CTN), and density (SLD). The existing high temperature pulser and telemetry system was upgraded to accommodate the data and bandwidth requirements of the additional sensors. Environmental and lifetime testing of system components and modules indicates that system life and reliability goals will be substantially exceeded. The system has performed well in domestic and international high temperature wells (to 175 C). In addition to the sensor modules specified in the project contract, Sperry has now upgraded other system components to higher temperature as well. These include a LWD sonic sensor (BAT), pressure while drilling sensor (PWD), and a more powerful central system controller (CIM).

Ronald L. Spross

2005-03-15T23:59:59.000Z

179

QED with a parabolic mirror  

E-Print Network (OSTI)

We investigate the quantum electrodynamics of a single two-level atom located at the focus of a parabolic cavity. We first work out the modifications of the spontaneous emission induced by the presence of this boundary in the optical regime, where the dipole and the rotating-wave approximations apply. Furthermore, the single-photon state that leaves the cavity asymptotically is determined. The corresponding time-reversed single-photon quantum state is capable of exciting the atom in this extreme multimode scenario with near-unit probability. Using semiclassical methods, we derive a photon-path representation for the relevant transition amplitudes and show that it constitutes a satisfactory approximation for a wide range of wavelengths.

G. Alber; J. Z. Bernád; M. Stobi?ska; L. L. Sánchez-Soto; G. Leuchs

2013-05-11T23:59:59.000Z

180

Anode for a secondary, high-temperature electrochemical cell  

DOE Patents (OSTI)

A high-temperature, secondary electrochemical cell includes an anode containing lithium, an electrolyte containing lithium ions and a cathode containing a chalcogen material such as sulfur or a metallic sulfide. The anode includes a porous substrate formed of, for instance, a compacted mass of entangled metallic fibers providing interstitial crevices for receiving molten lithium metal. The surfaces of the interstitial crevices are provided with a coating of cobalt metal to enhance the retention of the molten lithium metal within the substrate.

Vissers, Donald R. (Naperville, IL); Tani, Benjamin S. (Chicago, IL)

1976-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "include high-temperature parabolic" 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

Safety Issues for High Temperature Gas Reactors  

E-Print Network (OSTI)

Safety Issues for High Temperature Gas Reactors Andrew C. Kadak Professor of the Practice #12;Major regulation) 50mSv/a (Could be exceeded for rear recovery events) 50 mSv/a 20 mSv/a (average 5 y) (5 m performance of safety systems - natural circulation - heat conduction and convection. #12;Issues · Fuel

182

Thermal disconnect for high-temperature batteries  

DOE Patents (OSTI)

A new type of high temperature thermal disconnect has been developed to protect electrical and mechanical equipment from damage caused by operation at extreme temperatures. These thermal disconnects allow continuous operation at temperatures ranging from 250.degree. C. to 450.degree. C., while rapidly terminating operation at temperatures 50.degree. C. to 150.degree. C. higher than the continuous operating temperature.

Jungst, Rudolph George (Albuquerque, NM); Armijo, James Rudolph (Albuquerque, NM); Frear, Darrel Richard (Austin, TX)

2000-01-01T23:59:59.000Z

183

High temperature spectral gamma well logging  

Science Conference Proceedings (OSTI)

A high temperature spectral gamma tool has been designed and built for use in small-diameter geothermal exploration wells. Several engineering judgments are discussed regarding operating parameters, well model selection, and signal processing. An actual well log at elevated temperatures is given with spectral gamma reading showing repeatability.

Normann, R.A.; Henfling, J.A.

1997-01-01T23:59:59.000Z

184

Live Work with High Temperature Conductors  

Science Conference Proceedings (OSTI)

This report examines issues that may arise when live work is undertaken on conductors that operate at high temperatures (HT conductors) and provides the results from selected tests on the temperature levels reached by tools in contact with hot conductors. It also discusses possible concerns that may arise during de-energized work on lines that use HT conductors.

2009-12-15T23:59:59.000Z

185

S-Parabolic manifolds A. Aytuna and A. Sadullaev  

E-Print Network (OSTI)

S-Parabolic manifolds A. Aytuna and A. Sadullaev Abstract. A Stein manifold is called S parabolic. If a continuous special plurisubharmonic exits then we will call the manifold S parabolic: In one dimensional case of dimension n is called S parabolic in case there exits a special plurisubharmonic function 2 PSH (X

Yanikoglu, Berrin

186

ERGODIC THEORY OF PARABOLIC HORSESHOES MARIUSZ URBANSKI AND CHRISTIAN WOLF  

E-Print Network (OSTI)

ERGODIC THEORY OF PARABOLIC HORSESHOES MARIUSZ URBA´NSKI AND CHRISTIAN WOLF Abstract. In this paper parabolic fixed point and possibly also on Ws (). We call f a parabolic horseshoe map. In order to analyze of an embedded parabolic iterated function system and to apply the developed theory of the symbolic -finite

Urbanski, Mariusz

187

ERGODIC THEORY OF PARABOLIC HORSESHOES MARIUSZ URBANSKI AND CHRISTIAN WOLF  

E-Print Network (OSTI)

ERGODIC THEORY OF PARABOLIC HORSESHOES MARIUSZ URBA´NSKI AND CHRISTIAN WOLF Abstract. In this paper parabolic fixed point and possibly also on Ws (). We call f a parabolic horseshoe map. In order to analyze the pressure function to the pressure of an embedded parabolic iterated function system and to apply

Wolf, Christian

188

PARABOLIC RAYNAUD BUNDLES INDRANIL BISWAS AND GEORG HEIN  

E-Print Network (OSTI)

PARABOLIC RAYNAUD BUNDLES INDRANIL BISWAS AND GEORG HEIN Abstract. Let X be an irreducible smooth and N 2 a fixed integer. For any pair (r, d) N Ã? 1 N Z, there exists a parabolic vector bundle Rr,d, on X, with parabolic structure over S and all parabolic weights in 1 N Z, that has the following

Hein, Georg

189

On a parabolic logarithmic Sobolev inequality H. Ibrahim ,,, R. Monneau  

E-Print Network (OSTI)

On a parabolic logarithmic Sobolev inequality H. Ibrahim ,,, R. Monneau December 19, 2008 Abstract a parabolic version of the Kozono-Taniuchi inequality by means of anisotropic (parabolic) BMO norm. More precisely we give an upper bound for the L norm of a function in terms of its parabolic BMO norm, up

Monneau, Régis

190

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

191

Parabolic equations without a minimum principle  

E-Print Network (OSTI)

In this thesis, we consider several parabolic equations for which the minimum principle fails. We first consider a two-point boundary value problem for a one dimensional diffusion equation. We show the uniqueness and ...

Pang, Huadong

2007-01-01T23:59:59.000Z

192

Rational Approximation for a Quasilinear Parabolic Equation  

E-Print Network (OSTI)

Approximation theorems, analogous to known results for linear elliptic equations, are obtained for solutions of the heat equation. Via the Cole-Hopf transformation, this gives rise to approximation theorems for a nonlinear parabolic equation, Burgers' equation.

P. M. Gauthier; N. Tarkhanov

2007-09-22T23:59:59.000Z

193

Parabolic Trough Solar Thermal Electric Power Plants  

DOE Green Energy (OSTI)

Although many solar technologies have been demonstrated, parabolic trough solar thermal electric power plant technology represents one of the major renewable energy success stories of the last two decades.

Not Available

2003-06-01T23:59:59.000Z

194

Materials Degradation Studies for High Temperature Steam Electrolysis Systems  

DOE Green Energy (OSTI)

Experiments are currently in progress to assess the high temperature degradation behavior of materials in solid oxide electrolysis systems. This research includes the investigation of various electrolysis cell components and balance of plant materials under both anodic and cathodic gas atmospheres at temperatures up to 850°C. Current results include corrosion data for a high temperature nickel alloy used for the air-side flow field in electrolysis cells and a commercial ferritic stainless steel used as the metallic interconnect. Three different corrosion inhibiting coatings were also tested on the steel material. The samples were tested at 850ºC for 500 h in both air and H2O/H2 atmospheres. The results of this research will be used to identify degradation mechanisms and demonstrate the suitability of candidate materials for long-term operation in electrolysis cells.

Paul Demkowicz; Pavel Medvedev; Kevin DeWall; Paul Lessing

2007-06-01T23:59:59.000Z

195

Improved Martensitic Steel for High Temperature Applications  

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

Improved Martensitic Steel Improved Martensitic Steel for High Temperature Applications Opportunity Research is active on the patented technology, titled "Heat-Treated 9 Cr-1 Mo Steel for High Temperature Application." This technology is available for licensing and/or further collaborative research from the U.S. Department of Energy's National Energy Technology Laboratory (NETL). Overview The operating efficiency of coal-fired power plants is directly related to combustion system temperature and pressure. Incorporation of ultra- supercritical (USC) steam conditions into new or existing power plants can achieve increased efficiency and reduce coal consumption, while reducing carbon dioxide emissions as well as other pollutants. Traditionally used materials do not possess the optimal characteristics for operation

196

High-temperature helium-loop facility  

Science Conference Proceedings (OSTI)

The high-temperature helium loop is a facility for materials testing in ultrapure helium gas at high temperatures. The closed loop system is capable of recirculating high-purity helium or helium with controlled impurities. The gas loop maximum operating conditions are as follows: 300 psi pressure, 500 lb/h flow rate, and 2100/sup 0/F temperature. The two test sections can accept samples up to 3.5 in. diameter and 5 ft long. The gas loop is fully instrumented to continuously monitor all parameters of loop operation as well as helium impurities. The loop is fully automated to operate continuously and requires only a daily servicing by a qualified operator to replenish recorder charts and helium makeup gas. Because of its versatility and high degree of parameter control, the helium loop is applicable to many types of materials research. This report describes the test apparatus, operating parameters, peripheral systems, and instrumentation system.

Tokarz, R.D.

1981-09-01T23:59:59.000Z

197

Geochemistry of Aluminum in High Temperature Brines  

DOE Green Energy (OSTI)

geothermal industry to predict the chemistry ofthe reservoirs; these calculations will be tested for reliability against our laboratory results and field observations. Moreover, based on the success of the experimental methods developed in this program, we intend to use our unique high temperature pH easurement capabilities to make kinetic and equilibrium studies of pH-dependent aluminosilicate transformation reactions and other pH-dependent heterogeneous reactions.

Benezeth, P.; Palmer, D.A.; Wesolowski, D.J.

1999-05-18T23:59:59.000Z

198

Thermal fuse for high-temperature batteries  

SciTech Connect

A thermal fuse, preferably for a high-temperature battery, comprising leads and a body therebetween having a melting point between approximately 400.degree. C. and 500.degree. C. The body is preferably an alloy of Ag--Mg, Ag--Sb, Al--Ge, Au--In, Bi--Te, Cd--Sb, Cu--Mg, In--Sb, Mg--Pb, Pb--Pd, Sb--Zn, Sn--Te, or Mg--Al.

Jungst, Rudolph G. (Albuquerque, NM); Armijo, James R. (Albuquerque, NM); Frear, Darrel R. (Austin, TX)

2000-01-01T23:59:59.000Z

199

Vehicle Technologies Office: ORNL's High Temperature Materials Laboratory  

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

ORNL's High Temperature ORNL's High Temperature Materials Laboratory Assists NASCAR Teams to someone by E-mail Share Vehicle Technologies Office: ORNL's High Temperature Materials Laboratory Assists NASCAR Teams on Facebook Tweet about Vehicle Technologies Office: ORNL's High Temperature Materials Laboratory Assists NASCAR Teams on Twitter Bookmark Vehicle Technologies Office: ORNL's High Temperature Materials Laboratory Assists NASCAR Teams on Google Bookmark Vehicle Technologies Office: ORNL's High Temperature Materials Laboratory Assists NASCAR Teams on Delicious Rank Vehicle Technologies Office: ORNL's High Temperature Materials Laboratory Assists NASCAR Teams on Digg Find More places to share Vehicle Technologies Office: ORNL's High Temperature Materials Laboratory Assists NASCAR Teams on AddThis.com...

200

High-Dielectric Constant, High-Temperature Ceramic Capacitors for ...  

Science Conference Proceedings (OSTI)

Growth of Thick, On-Axis SiC Epitaxial Layers by High Temperature Halide CVD for High Voltage Power Devices · High-Dielectric Constant, High-Temperature ...

Note: This page contains sample records for the topic "include high-temperature parabolic" 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

Sealed glass coating of high temperature ceramic superconductors  

DOE Patents (OSTI)

A method and article of manufacture of a lead oxide based glass coating on a high temperature superconductor. The method includes preparing a dispersion of glass powders in a solution, applying the dispersion to the superconductor, drying the dispersion before applying another coating and heating the glass powder dispersion at temperatures below oxygen diffusion onset and above the glass melting point to form a continuous glass coating on the superconductor to establish compressive stresses which enhance the fracture strength of the superconductor.

Wu, Weite (Tainan, TW); Chu, Cha Y. (Garnerville, NY); Goretta, Kenneth C. (Downers Grove, IL); Routbort, Jules L. (Darien, IL)

1995-01-01T23:59:59.000Z

202

High-Temperature Thermodynamic Data for Species in Aqueous Solution  

Science Conference Proceedings (OSTI)

This report summarizes the results of experimental and theoretical research on the high-temperature thermodynamic properties of aqueous species important to nuclear reactor water chemistry. Methods of predicting thermodynamic functions are presented for electrolytes up to 300 degrees Celsius for use in supplementing experimental data. The report includes tables (up to 300 degrees Celsius) of (1) important equilibrium constants for 78 reactions encountered in corrosion and precipitation in nuclear reactor...

1982-05-01T23:59:59.000Z

203

Guide for High Temperature Operation of Overhead Lines: 2012 Updates  

Science Conference Proceedings (OSTI)

This Guide assists users in raising the capacities of overhead transmission lines by increasing the conductor temperature. It is based on a wealth of knowledge accumulated from extensive research conducted internally at the Electric Power Research Institute (EPRI), information from manufacturers, and results from research conducted outside of EPRI. The Guide has evolved from a collection of numerous EPRI reports published in the past, including Effect of High-Temperature Cycling on Conductor ...

2012-12-12T23:59:59.000Z

204

Guide for Selection and Application of High-Temperature Conductors  

Science Conference Proceedings (OSTI)

Extensive research has been conducted by the Electric Power Research Institute (EPRI) on high-temperature low-sag (HTLS) conductors. Much knowledge has been gained on this type of conductor since EPRI initiated its first HTLS conductor research project in 2004. The projects on HTLS conductors completed to date include field demonstration, material study, and short-term to long-term performance evaluations. These projects were conducted under different funding arrangements and were sometimes ...

2012-12-31T23:59:59.000Z

205

Effect of High Temperature Cycling on Conductor Systems  

Science Conference Proceedings (OSTI)

One of the alternatives for increasing power flow on an existing transmission line is to raise the operating temperature of its conductor. The effects of high operating temperature on the conductor, however, include loss in conductor strength and reduction in conductor clearance to ground. The high temperature also affects the short- and long-term performance of the conductor connections and conductor accessories. All of these effects must be assessed for an overhead line to operate safely and reliably a...

2007-12-18T23:59:59.000Z

206

High temperature simulation of petroleum formation  

Science Conference Proceedings (OSTI)

Petroleum formation has been simulated in the laboratory with emphasis on the effects of temperature, mineral catalysis, and starting material structure on the yield and composition of the liquid and gaseous hydrocarbon products. In an attempt to prove the hypothesis that petroleum formation can be simulated using high temperatures, Green River Shale from Colorado, USA, was subjected to pyrolysis for 16 hours at temperatures ranging from 300 to 500/sup 0/C. The sequence of products formed over this temperature range was used as the basis for defining five different zones of maturation reaction: 1) a heterobond cracking zone; 2) a labile carbon bond cracking zone; 3) a free radical synthesis zone; 4) a wet gas formation zone; and 5) an aromatization zone. The role of some typical inorganic components of sedimentary rocks in the origin and maturation of petroleum has been investigated using this high temperature model. The importance of the structure of organic matter in petroelum formation has also been investigated using this high temperature model. Lignin and cellulose are poor sources of liquid hydrocarbons, but cellulose in the presence of carbonate gives a high yield of gaseous hydrocarbons. Protein pyrolysis gives a high oil yield with an alkane distribution similar to petroleum. The lipids produced the highest oil yield of the substances tested but the n-alkanes show an odd carbon length predominance unlike the distribution found in petroleum.

Evans, R.J.

1982-01-01T23:59:59.000Z

207

Parabolic Trough Solar Power Plant Simulation Model: Preprint  

DOE Green Energy (OSTI)

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

208

Parabolic Trouogh Optical Characterization at the National Renewable Energy Laboratory  

DOE Green Energy (OSTI)

Solar parabolic trough power plant projects are soon to be implemented in the United States and internationally. In addition to these new projects, parabolic trough power plants totaling approximately 350 MW already exist within the United States and have operated for close to 20 years. As such, the status of the technology exists within several different phases. Theses phases include R&D, manufacturing and installation, and operations and maintenance. One aspect of successful deployment of this technology is achieving and maintaining optical performance. Different optical tools are needed to assist in improving initial designs, provide quality control during manufacture and assembly, and help maintain performance during operation. This paper discusses several such tools developed at SunLab (a joint project of the National Renewable Laboratory and Sandia National Laboratories) for these purposes. Preliminary testing results are presented. Finally, plans for further tool development are discussed.

Wendelin, T. J.

2005-01-01T23:59:59.000Z

209

Development of High Temperature Capacitor Technology and Manufacturing Capability  

SciTech Connect

The goal of the Development of High Temperature Capacitor Technology and Manufacturing Capability program was to mature a production-ready supply chain for reliable 250°C FPE (fluorinated polyester) film capacitors by 2011. These high-temperature film capacitors enable both the down hole drilling and aerospace industries by enabling a variety of benefits including: ? Deeper oil exploration in higher temperature and pressure environments ? Enabling power electronic and control equipment to operate in higher temperature environments ? Enabling reduced cooling requirements of electronics ? Increasing reliability and life of capacitors operating below rated temperature ? Enabling capacitors to handle higher electrical losses without overheating. The key challenges to bringing the FPE film capacitors to market have been manufacturing challenges including: ? FPE Film is difficult to handle and wind, resulting in poor yields ? Voltage breakdown strength decreases when the film is wound into capacitors (~70% decrease) ? Encapsulation technologies must be improved to enable higher temperature operation ? Manufacturing and test cycle time is very long As a direct result of this program most of the manufacturing challenges have been met. The FPE film production metalization and winding yield has increased to over 82% from 70%, and the voltage breakdown strength of the wound capacitors has increased 270% to 189 V/?m. The high temperature packaging concepts are showing significant progress including promising results for lead attachments and hermetic packages at 200°C and non-hermetic packages at 250°C. Manufacturing and test cycle time will decrease as the market for FPE capacitors develops.

None

2011-05-15T23:59:59.000Z

210

Hydrogen production from fusion reactors coupled with high temperature electrolysis  

DOE Green Energy (OSTI)

The decreasing availability of fossil fuels emphasizes the need to develop systems which will produce synthetic fuel to substitute for and complement the natural supply. An important first step in the synthesis of liquid and gaseous fuels is the production of hydrogen. Thermonuclear fusion offers an inexhaustible source of energy for the production of hydrogen from water. Processes which may be considered for this purpose include electrolysis, thermochemical decomposition or thermochemical-electrochemical hybrid cycles. Preliminary studies at Brookhaven indicate that high temperature electrolysis has the highest potential efficiency for production of hydrogen from fusion. Depending on design electric generation efficiencies of approximately 40 to 60 percent and hydrogen production efficiencies of approximately 50 to 70 percent are projected for fusion reactors using high temperature blankets.

Fillo, J A; Powell, J R; Steinberg, M

211

Classification of Invariant Differential Operators for Non-Compact Lie Algebras via Parabolic Relations  

E-Print Network (OSTI)

In the present paper we review the progress of the project of classification and construction of invariant differential operators for non-compact semisimple Lie groups. Our starting points is the class of algebras, which we called earlier 'conformal Lie algebras' (CLA), which have very similar properties to the conformal algebras of Minkowski space-time, though our aim is to go beyond this class in a natural way. For this we introduced recently the new notion of {\\it parabolic relation} between two non-compact semisimple Lie algebras $\\cal G$ and $\\cal G'$ that have the same complexification and possess maximal parabolic subalgebras with the same complexification. Thus, we consider the exceptional algebra $E_{7(7)}$ which is parabolically related to the CLA $E_{7(-25)}$. Other interesting examples are the orthogonal algebras $so(p,q)$ all of which are parabolically related to the conformal algebra $so(n,2)$ with $p+q=n+2$, the parabolic subalgebras including the Lorentz subalgebra $so(n-1,1)$ and its analogs $so(p-1,q-1)$. Further we consider the algebras $sl(2n,R)$ and for $n=2k$ the algebras $su^*(4k)$ which are parabolically related to the CLA $su(n,n)$. Further we consider the algebras $sp(r,r)$ which are parabolically related to the CLA $sp(2r,R)$. We consider also $E_{6(6)}$ and $E_{6(2)}$ which are parabolically related to the hermitian symmetric case $E_{6(-14)}$.

V. K. Dobrev

2013-11-29T23:59:59.000Z

212

Live Working Tools for High Temperature Conductors  

Science Conference Proceedings (OSTI)

In long-duration (several days) tests, strain link sticks used for live work were removed from service and exposed to conductors operating at high temperature of about 250-260C. Only strain link sticks were tested to date. Results obtained do not indicate damage or deterioration of the tested sticks. The research is a joint effort between project 35.010 Live Working Research for Overhead Transmission Equipment, Techniques, Procedures and Protective Grounding and project 35.015 Advanced Conductors to inve...

2010-12-17T23:59:59.000Z

213

High-temperature directional drilling turbodrill  

DOE Green Energy (OSTI)

The development of a high-temperature turbodrill for directional drilling of geothermal wells in hard formations is summarized. The turbodrill may be used for straight-hole drilling but was especially designed for directional drilling. The turbodrill was tested on a dynamometer stand, evaluated in laboratory drilling into ambient temperature granite blocks, and used in the field to directionally drill a 12-1/4-in.-diam geothermal well in hot 200/sup 0/C (400/sup 0/F) granite at depths to 10,5000 ft.

Neudecker, J.W.; Rowley, J.C.

1982-02-01T23:59:59.000Z

214

New Waste Calciner High Temperature Operation  

SciTech Connect

A new Calciner flowsheet has been developed to process the sodium-bearing waste (SBW) in the INTEC Tank Farm. The new flowsheet increases the normal Calciner operating temperature from 500 C to 600 C. At the elevated temperature, sodium in the waste forms stable aluminates, instead of nitrates that melt at calcining temperatures. From March through May 2000, the new high-temperature flowsheet was tested in the New Waste Calcining Facility (NWCF) Calciner. Specific test criteria for various Calciner systems (feed, fuel, quench, off-gas, etc.) were established to evaluate the long-term operability of the high-temperature flowsheet. This report compares in detail the Calciner process data with the test criteria. The Calciner systems met or exceeded all test criteria. The new flowsheet is a visible, long-term method of calcining SBW. Implementation of the flowsheet will significantly increase the calcining rate of SBW and reduce the amount of calcine produced by reducing the amount of chemical additives to the Calciner. This will help meet the future waste processing milestones and regulatory needs such as emptying the Tank Farm.

Swenson, M.C.

2000-09-01T23:59:59.000Z

215

Sourcebook on high-temperature electronics and instrumentation  

DOE Green Energy (OSTI)

This sourcebook summarizes the high-temperature characteristics of a number of commercially available electronic components and materials required in geothermal well-logging instruments that must operate to 275/sup 0/C. The sourcebook is written to provide a starting place for instrument designers, who need to know the high-temperature electronic products that are available and the design and performance limitations of these products. The electronic component information given includes the standard repertoire of passive devices such as resistors, capacitors, and magnetics; the active devices and integrated circuits sections emphasize silicon semiconductor JFETs and CMOS circuits; and, to complete the electronics, interconnections and packaging of hybrid microelectronics are described. Thermal insulation and refrigeration alternatives are also presented in the sourcebook. Finally, instrument housing materials and high-temperature cables and cablehead connectors are listed. This information was compiled as part of the Geothermal Logging Instrumentation Development Program that Sandia National Laboratories conducted for the US Department of Energy's Divison of Geothermal Energy from 1976 to 1981.

Veneruso, A.F. (ed.)

1981-10-01T23:59:59.000Z

216

High-Temperature-High-Volume Lifting For Enhanced Geothermal Systems  

Open Energy Info (EERE)

Temperature-High-Volume Lifting For Enhanced Geothermal Systems Temperature-High-Volume Lifting For Enhanced Geothermal Systems Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title High-Temperature-High-Volume Lifting For Enhanced Geothermal Systems Project Type / Topic 1 Recovery Act: Enhanced Geothermal Systems Component Research and Development/Analysis Project Type / Topic 2 High-Temperature-High-Volume Lifting Project Description The proposed scope of work is divided into three Phases. Overall system requirements will be established in Phase 1, along with an evaluation of existing lifting system capability, identification of technology limitations, and a conceptual design of an overall lifting system. In developing the system components in Phase 2, component-level tests will be conducted using GE facilities. Areas of development will include high-temperature drive system materials, journal and thrust bearings, and corrosion and erosion-resistant lifting pump components. Finally, in Phase 3, the overall lab-scale lifting system will be demonstrated in a flow loop that will be constructed at GE Global Research.

217

Sourcebook on high-temperature electronics and instrumentation  

SciTech Connect

This sourcebook summarizes the high-temperature characteristics of a number of commercially available electronic components and materials required in geothermal well-logging instruments that must operate to 275/sup 0/C. The sourcebook is written to provide a starting place for instrument designers, who need to know the high-temperature electronic products that are available and the design and performance limitations of these products. The electronic component information given includes the standard repertoire of passive devices such as resistors, capacitors, and magnetics; the active devices and integrated circuits sections emphasize silicon semiconductor JFETs and CMOS circuits; and, to complete the electronics, interconnections and packaging of hybrid microelectronics are described. Thermal insulation and refrigeration alternatives are also presented in the sourcebook. Finally, instrument housing materials and high-temperature cables and cablehead connectors are listed. This information was compiled as part of the Geothermal Logging Instrumentation Development Program that Sandia National Laboratories conducted for the US Department of Energy's Divison of Geothermal Energy from 1976 to 1981.

Veneruso, A.F. (ed.)

1981-10-01T23:59:59.000Z

218

High temperature gas-cooled reactor: gas turbine application study  

SciTech Connect

The high-temperature capability of the High-Temperature Gas-Cooled Reactor (HTGR) is a distinguishing characteristic which has long been recognized as significant both within the US and within foreign nuclear energy programs. This high-temperature capability of the HTGR concept leads to increased efficiency in conventional applications and, in addition, makes possible a number of unique applications in both electrical generation and industrial process heat. In particular, coupling the HTGR nuclear heat source to the Brayton (gas turbine) Cycle offers significant potential benefits to operating utilities. This HTGR-GT Application Study documents the effort to evaluate the appropriateness of the HTGR-GT as an HTGR Lead Project. The scope of this effort included evaluation of the HTGR-GT technology, evaluation of potential HTGR-GT markets, assessment of the economics of commercial HTGR-GT plants, and evaluation of the program and expenditures necessary to establish HTGR-GT technology through the completion of the Lead Project.

Not Available

1980-12-01T23:59:59.000Z

219

RAPHAEL: The European Union's (Very) High Temperature Reactor Technology Project  

SciTech Connect

Since the late 1990, the European Union (EU) was conducting work on High Temperature Reactors (HTR) confirming their high potential in terms of safety (inherent safety features), environmental impact (robust fuel with no significant radioactive release), sustainability (high efficiency, potential suitability for various fuel cycles), and economics (simplifications arising from safety features). In April 2005, the EU Commission has started a new 4-year Integrated Project on Very High Temperature Reactors (RAPHAEL: Reactor for Process Heat And Electricity) as part of its 6{sup th} Framework Programme. The European Commission and the 33 partners from industry, R and D organizations and academia finance the project together. After the successful performance of earlier HTR-related EU projects which included the recovery of some earlier German experience and the re-establishment of strategically important R and D capabilities in Europe, RAPHAEL focuses now on key technologies required for an industrial VHTR deployment, both specific to very high temperature and generic to all types of modular HTR with emphasis on combined process heat and electricity generation. Advanced technologies are explored in order to meet the performance challenges required for a VHTR (900-1000 deg C, up to 200 GWd/tHM). To facilitate the planned sharing of significant parts of RAPHAEL results with the signatories of the Generation IV International Forum (GIF) VHTR projects, RAPHAEL is structured in a similar way as the corresponding GIF VHTR projects. (authors)

Fuetterer, Michael A. [European Commission, Joint Research Centre, Institute for Energy, P.O. Box 2, NL-1755 ZG Petten (Netherlands); Besson, D.; Bogusch, E.; Carluec, B.; Hittner, D.; Verrier, D. [AREVA Framatome-ANP (France); Billot, Ph.; Phelip, M. [Commissariat a l'Energie Atomique (France); Buckthorpe, D. [NNC Ltd, Knutsford (United Kingdom); Casalta, S. [European Commission, DG RTD, Brussels (Belgium); Chauvet, V. [STEP, Paris (France); Van Heek, A. [Nuclear Research and Consultancy Group, Petten (Netherlands); Von Lensa, W. [Forschungszentrum Juelich (Germany); Pirson, J. [Tractebel Engineering, Brussels (Belgium); Scheuermann, W. [Institut fuer Kernenergetik, University of Stuttgart (Germany)

2006-07-01T23:59:59.000Z

220

A Mechanistically Based Model for High Temperature LCF of Ni ...  

Science Conference Proceedings (OSTI)

5. Oxidation was well-represented by parabolic kinetics and an activation energy of 9.6 k-cal/mol. 6. Based on metallographic observations and LCF test results.

Note: This page contains sample records for the topic "include high-temperature parabolic" 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

Superconductivity Program Overview High-Temperature Superconductivity  

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

SuperconducTiviTy program haS Three FocuS areaS: SuperconducTiviTy program haS Three FocuS areaS: SuperconducTiviTy applicaTionS Developing HTS-based electric power equipment such as transmission and distribution cables and fault current limiters Second-generaTion Wire developmenT Developing high-performance, low-cost, second- generation HTS wire at long lengths STraTegic reSearch Supporting fundamental research activities to better understand relationships between the microstructure of HTS materials and their ability to carry large electric currents over long lengths Superconductivity Program Overview High-Temperature Superconductivity for Electric Systems Office of Electricity Delivery and Energy Reliability www.oe.energy.gov Office of Electricity Delivery and Energy Reliability, OE-1 U.S. Department of Energy - 1000 Independence Avenue, SW - Washington, DC 20585

222

High Temperature Battery for Drilling Applications  

SciTech Connect

In this project rechargeable cells based on the high temperature electrochemical system Na/beta''-alumina/S(IV) in AlCl3/NaCl were developed for application as an autonomous power source in oil/gas deep drilling wells. The cells operate in the temperature range from 150 C to 250 C. A prototype DD size cell was designed and built based on the results of finite element analysis and vibration testing. The cell consisted of stainless steel case serving as anode compartment with cathode compartment installed in it and a seal closing the cell. Critical element in cell design and fabrication was hermetically sealing the cell. The seal had to be leak tight, thermally and vibration stable and compatible with electrode materials. Cathode compartment was built of beta''-alumina tube which served as an electrolyte, separator and cathode compartment.

Josip Caja

2009-12-31T23:59:59.000Z

223

Compliant high temperature seals for dissimilar materials  

DOE Patents (OSTI)

A high temperature, gas-tight seal is formed by utilizing one or more compliant metallic toroidal ring sealing elements, where the applied pressure serves to activate the seal, thus improving the quality of the seal. The compliant nature of the sealing element compensates for differences in thermal expansion between the materials to be sealed, and is particularly useful in sealing a metallic member and a ceramic tube art elevated temperatures. The performance of the seal may be improved by coating the sealing element with a soft or flowable coating such as silver or gold and/or by backing the sealing element with a bed of fine powder. The material of the sealing element is chosen such that the element responds to stress elastically, even at elevated temperatures, permitting the seal to operate through multiple thermal cycles.

Rynders, Steven Walton (Fogelsville, PA); Minford, Eric (Laurys Station, PA); Tressler, Richard Ernest (Boalsburg, PA); Taylor, Dale M. (Salt Lake City, UT)

2001-01-01T23:59:59.000Z

224

High Temperature Materials Laboratory (HTML) - PSD Directorate  

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

filler A National Resource for Collaborative Materials Research The High Temperature Materials Laboratory (HTML) User Program is on hiatus due to federal budget reductions. However, research projects at the HTML still may be conducted on a cost-recovery basis through the Work for Others (WFO) Program or under a Cooperative R&D Agreement (CRADA). Dr. Edgar Lara-Curzio, HTML Director Tel: 865.574.1749 Fax: 865.574.4913 laracurzioe@ornl.gov Christine Goudy, Administrative Specialist Tel: 865.574.8295 Fax: 865.574.4913 goudyc@ornl.gov Oak Ridge National Laboratory [MST Home] [ORNL Home] [Site Index] [Search][Disclaimer] [Webmaster] Oak Ridge National Laboratory is a national multi-program research and development facility managed by UT-Battelle, LLC for the U.S. Department of Energy

225

Multilayer ultra-high-temperature ceramic coatings  

SciTech Connect

A coated carbon-carbon composite material with multiple ceramic layers to provide oxidation protection from ultra-high-temperatures, where if the carbon-carbon composite material is uninhibited with B.sub.4C particles, then the first layer on the composite material is selected from ZrB.sub.2 and HfB.sub.2, onto which is coated a layer of SiC coated and if the carbon-carbon composite material is inhibited with B.sub.4C particles, then protection can be achieved with a layer of SiC and a layer of either ZrB.sub.2 and HfB.sub.2 in any order.

Loehman, Ronald E. (Albuquerque, NM); Corral, Erica L. (Tucson, AZ)

2012-03-20T23:59:59.000Z

226

Precision control of high temperature furnaces  

DOE Patents (OSTI)

It is an object of the present invention to provide precision control of high temperature furnaces. It is another object of the present invention to combine the power of two power supplies of greatly differing output capacities in a single furnace. This invention combines two power supplies to control a furnace. A main power supply heats the furnace in the traditional manner, while the power from the auxiliary supply is introduced as a current flow through charged particles existing due to ionized gas or thermionic emission. The main power supply provides the bulk heating power and the auxiliary supply provides a precise and fast power source such that the precision of the total power delivered to the furnace is improved. Further, this invention comprises a means for high speed measurement of temperature of the process by the method of measuring the amount of current flow in a deliberately induced charged particle current.

Pollock, G.G.

1994-12-31T23:59:59.000Z

227

Pressure sensor for high-temperature liquids  

DOE Patents (OSTI)

A pressure sensor for use in measuring pressures in liquid at high temperatures, especially such as liquid sodium or liquid potassium, comprises a soft diaphragm in contact with the liquid. The soft diaphragm is coupled mechanically to a stiff diaphragm. Pressure is measured by measuring the displacment of both diaphragms, typically by measuring the capacitance between the stiff diaphragm and a fixed plate when the stiff diaphragm is deflected in response to the measured pressure through mechanical coupling from the soft diaphragm. Absolute calibration is achieved by admitting gas under pressure to the region between diaphragms and to the region between the stiff diaphragm and the fixed plate, breaking the coupling between the soft and stiff diaphragms. The apparatus can be calibrated rapidly and absolutely.

Forster, George A. (Westmont, IL)

1978-01-01T23:59:59.000Z

228

High-temperature superconducting current leads  

Science Conference Proceedings (OSTI)

Use of high-temperature superconductors (HTSs) for current leads to deliver power to devices at liquid helium temperature can reduce refrigeration requirements to values significantly below those achievable with conventional leads. HTS leads are now near commercial realization. Argonne National Laboratory (ANL) has developed a sinter-forge process to fabricate current leads from bismuth-based superconductors. The current-carrying capacity of these leads is five times better than that of HTS leads made by a conventional fabrication process. ANL along with Superconductivity, Inc., has developed a 1500 ampere current lead for an existing superconducting magnetic energy storage (SMES) device. With Babcock & Wilcox Company, Argonne is creating 16-kiloampere leads for use in a 0.5 MWh SMES. In a third project Argonne performed characterization testing of a existing, proprietary conduction-cooled lead being developed by Zer Res Corp.

Niemann, R.C.

1995-03-01T23:59:59.000Z

229

Parabolic trough solar collectors : design for increasing efficiency  

E-Print Network (OSTI)

Parabolic trough collectors are a low cost implementation of concentrated solar power technology that focuses incident sunlight onto a tube filled with a heat transfer fluid. The efficiency and cost of the parabolic trough ...

Figueredo, Stacy L. (Stacy Lee), 1981-

2011-01-01T23:59:59.000Z

230

Design considerations for parabolic-cylindrical solar collectors  

DOE Green Energy (OSTI)

This report presents in some detail the various significant factors which influence the design of parabolic-cylindrical solar collectors.

Treadwell, G.W.

1976-07-01T23:59:59.000Z

231

Heat exchangers for high-temperature thermodynamic cycles  

SciTech Connect

The special requirements of heat exchangers for high temperature thermodynamic cycles are outlined and discussed with particular emphasis on cost and thermal stress problems. Typical approaches that have been taken to a comprehensive solution intended to meet all of the many boundary conditions are then considered by examining seven typical designs including liquid-to-liquid heat exchangers for nuclear plants, a heater for a closed cycle gas turbine coupled to a fluidized bed coal combustion chamber, steam generators for nuclear plants, a fossil fuel-fired potassium boiler, and a potassium condenser-steam generator. (auth)

Fraas, A.P.

1975-01-01T23:59:59.000Z

232

Sealed glass coating of high temperature ceramic superconductors  

DOE Patents (OSTI)

A method and article of manufacture of a lead oxide based glass coating on a high temperature superconductor is disclosed. The method includes preparing a dispersion of glass powders in a solution, applying the dispersion to the superconductor, drying the dispersion before applying another coating and heating the glass powder dispersion at temperatures below oxygen diffusion onset and above the glass melting point to form a continuous glass coating on the superconductor to establish compressive stresses which enhance the fracture strength of the superconductor. 8 figs.

Wu, W.; Chu, C.Y.; Goretta, K.C.; Routbort, J.L.

1995-05-02T23:59:59.000Z

233

Numerical investigations into the formation of a high temperature reservoir''  

DOE Green Energy (OSTI)

This paper summarizes an ongoing numerical modeling effort aimed at describing some of the thermodynamic conditions observed in vapor- dominated reservoirs, including the formation of a high temperature reservoir (HTR) beneath the typical'' reservoir. The modeled system begins as a hot water geothermal reservoir, and evolves through time into a vapor-dominated reservoir with a HTR at depth. This approach taken here to develop a vapor-dominated system is similar to that of Pruess (1985), and involves induced boiling through venting. The reservoir description is intentionally generic, but serves to describe a means of evolution of conditions observed (in particular) The Geysers.

Shook, M.

1993-01-01T23:59:59.000Z

234

Numerical investigations into the formation of a ``high temperature reservoir``  

DOE Green Energy (OSTI)

This paper summarizes an ongoing numerical modeling effort aimed at describing some of the thermodynamic conditions observed in vapor- dominated reservoirs, including the formation of a high temperature reservoir (HTR) beneath the ``typical`` reservoir. The modeled system begins as a hot water geothermal reservoir, and evolves through time into a vapor-dominated reservoir with a HTR at depth. This approach taken here to develop a vapor-dominated system is similar to that of Pruess (1985), and involves induced boiling through venting. The reservoir description is intentionally generic, but serves to describe a means of evolution of conditions observed (in particular) The Geysers.

Shook, M.

1993-04-01T23:59:59.000Z

235

High Temperature Integrated Thermoelectric Ststem and Materials  

DOE Green Energy (OSTI)

The final goal of this project is to produce, by the end of Phase II, an all ceramic high temperature thermoelectric module. Such a module design integrates oxide ceramic n-type, oxide ceramic p-type materials as thermoelectric legs and oxide ceramic conductive material as metalizing connection between n-type and p-type legs. The benefits of this all ceramic module are that it can function at higher temperatures (> 700 C), it is mechanically and functionally more reliable and it can be scaled up to production at lower cost. With this all ceramic module, millions of dollars in savings or in new opportunities recovering waste heat from high temperature processes could be made available. A very attractive application will be to convert exhaust heat from a vehicle to reusable electric energy by a thermoelectric generator (TEG). Phase I activities were focused on evaluating potential n-type and p-type oxide compositions as the thermoelectric legs. More than 40 oxide ceramic powder compositions were made and studied in the laboratory. The compositions were divided into 6 groups representing different material systems. Basic ceramic properties and thermoelectric properties of discs sintered from these powders were measured. Powders with different particles sizes were made to evaluate the effects of particle size reduction on thermoelectric properties. Several powders were submitted to a leading thermoelectric company for complete thermoelectric evaluation. Initial evaluation showed that when samples were sintered by conventional method, they had reasonable values of Seebeck coefficient but very low values of electrical conductivity. Therefore, their power factors (PF) and figure of merits (ZT) were too low to be useful for high temperature thermoelectric applications. An unconventional sintering method, Spark Plasma Sintering (SPS) was determined to produce better thermoelectric properties. Particle size reduction of powders also was found to have some positive benefits. Two composition systems, specifically 1.0 SrO - 0.8 x 1.03 TiO2 - 0.2 x 1.03 NbO2.5 and 0.97 TiO2 - 0.03 NbO2.5, have been identified as good base line compositions for n-type thermoelectric compositions in future module design. Tests of these materials at an outside company were promising using that company's processing and material expertise. There was no unique p-type thermoelectric compositions identified in phase I work other than several current cobaltite materials. Ca3Co4O9 will be the primary p-type material for the future module design until alternative materials are developed. BaTiO3 and rare earth titanate based dielectric compositions show both p-type and n-type behavior even though their electrical conductivities were very low. Further research and development of these materials for thermoelectric applications is planned in the future. A preliminary modeling and optimization of a thermoelectric generator (TEG) that uses the n-type 1.0 SrO - 1.03 x 0.8 TiO2 - 1.03 x 0.2 NbO2.5 was performed. Future work will combine development of ceramic powders and manufacturing expertise at TAM, development of SPS at TAM or a partner organization, and thermoelectric material/module testing, modeling, optimization, production at several partner organizations.

Mike S. H. Chu

2011-06-06T23:59:59.000Z

236

PARABOLIC SUBGROUPS OF GARSIDE GROUPS II : EDDY GODELLE  

E-Print Network (OSTI)

PARABOLIC SUBGROUPS OF GARSIDE GROUPS II : RIBBONS EDDY GODELLE Abstract. We introduce parabolic subgroupoids and provide a groupoid presentation. In order to established the latter result, we subgroups, namely the standard parabolic subgroups, which are the subgroups generated by a subset

Paris-Sud XI, Université de

237

PARABOLIC DELIGNE-LUSZTIG VARIETIES. FRANCOIS DIGNE AND JEAN MICHEL  

E-Print Network (OSTI)

PARABOLIC DELIGNE-LUSZTIG VARIETIES. FRANC¸OIS DIGNE AND JEAN MICHEL Abstract. Motivated by the Brou´e conjecture on blocks with abelian defect groups for finite reductive groups, we study "parabolic categories. 1. Introduction In this paper, we study "parabolic" Deligne-Lusztig varieties, one of the main

Paris-Sud XI, Université de

238

INITIAL BOUNDARY VALUE PROBLEMS FOR A QUASILINEAR PARABOLIC SYSTEM  

E-Print Network (OSTI)

INITIAL BOUNDARY VALUE PROBLEMS FOR A QUASILINEAR PARABOLIC SYSTEM IN THREE-PHASE CAPILLARY FLOW problems for a quasi- linear parabolic system motivated by three-phase ow in porous medium in the presence quasilinear parabolic sys- tems of the form (1.1) u t + f(u) x = (B(u)u x ) x ; 0

239

Convergence properties of the local defect correction method for parabolic  

E-Print Network (OSTI)

Convergence properties of the local defect correction method for parabolic problems R. Minero , H for parabolic problems presented in [14]. We derive a general expression for the iteration matrix of the method, domain decomposition and regridding. In [14] LDC is generalized to solve parabolic partial differential

Eindhoven, Technische Universiteit

240

Parabolic PDEs and Deterministic Games Robert V. Kohn  

E-Print Network (OSTI)

Parabolic PDEs and Deterministic Games Robert V. Kohn Courant Institute, NYU Joint work with Sylvia Serfaty ICIAM07, Zurich, July 2007 Robert V. Kohn Courant Institute, NYU Parabolic PDEs and Deterministic. Kohn Courant Institute, NYU Parabolic PDEs and Deterministic Games #12;Goals and perspective Part 1

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they are not comprehensive nor are they the most current set.
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to obtain the most current and comprehensive results.


241

Generation of parabolic pulses and applications for optical telecommunications  

E-Print Network (OSTI)

Generation of parabolic pulses and applications for optical telecommunications Christophe Finot 1.Finot@u-bourgogne.fr ABSTRACT Parabolic pulses in optical fibers have stimulated an increasing number of applications. We review amplifiers, optical pulse processing techniques 1. INTRODUCTION Parabolic pulse generation and propagation

Paris-Sud XI, Université de

242

Di usive Kinetic Explicit Schemes for Nonlinear Degenerate Parabolic Systems  

E-Print Network (OSTI)

Di#11;usive Kinetic Explicit Schemes for Nonlinear Degenerate Parabolic Systems #3; D. Aregba parabolic systems. These schemes are based on discrete BGK models where both characteristic velocities. Evje and K.H. Karlsen [15] and of M. Espedal and K.H. Karlsen [14]. For the theory of general parabolic

243

Curvilinear parabolic approximation for surface wave transformation with wavecurrent interaction  

E-Print Network (OSTI)

Curvilinear parabolic approximation for surface wave transformation with wave­current interaction not be an appropriate method for the purpose of simplifying the curvilinear parabolic approximation of the vector form of the wave­current equation given by Kirby [Higher-order approximations in the parabolic equation method

Kirby, James T.

244

Theory of parabolic pulse generation in tapered Anton I. Latkin  

E-Print Network (OSTI)

Theory of parabolic pulse generation in tapered fiber Anton I. Latkin Institute of Automation and differences between high-power parabolic pulse generation in an active me- dium and in tapered fiber of parabolic pulse generation without an external pump and determine the limita- tions of this approach. © 2007

Turitsyn, Sergei K.

245

Parabolic surfaces in hyperbolic space with constant Gaussian curvature  

E-Print Network (OSTI)

Parabolic surfaces in hyperbolic space with constant Gaussian curvature Rafael L´opez Departamento@ugr.es Keywords: hyperbolic space, parabolic surface, Gaussian curvature MSC 2000 subject classification: 53A10, 53C45 Abstract A parabolic surface in hyperbolic space H3 is a surface invariant by a group

López, Rafael

246

On Parallel Asynchronous HighOrder Solutions of Parabolic PDEs  

E-Print Network (OSTI)

On Parallel Asynchronous High­Order Solutions of Parabolic PDEs appeared in Numerical Algorithms Parabolic PDEs. They are asynchronous in the sense that each processor is allowed to advance at its own and synchronous finite difference methods, parabolic finite difference approximations with constant coefficients

Averbuch, Amir

247

Compound parabolic concentrators for narrowband wireless infrared receivers  

E-Print Network (OSTI)

Compound parabolic concentrators for narrowband wireless infrared receivers Keang-Po Ho Joseph M and hollow compound parabolic concentrators (CPCs), for use in free-space infrared communication receivers terms: compound parabolic concentrators (CPCs); optical bandpass fil- ters; Monte Carlo ray tracing

Kahn, Joseph M.

248

Rotational and Parabolic Surfaces in PSL2(R, ) and Applications  

E-Print Network (OSTI)

Rotational and Parabolic Surfaces in PSL2(R, ) and Applications By Carlos Espinoza Pe~nafiel 1 of either rotational isometries or parabolic isometries, immersed into the homogeneous manifold PSL2(R, ). Also, we give some applications. Keywords. Constant mean curvature. Rotational surfaces. Parabolic

Paris-Sud XI, Université de

249

FINITE DIFFERENCE METHODS FOR THE WIDE-ANGLE `PARABOLIC' EQUATION  

E-Print Network (OSTI)

FINITE DIFFERENCE METHODS FOR THE WIDE-ANGLE `PARABOLIC' EQUATION GEORGIOS AKRIVIS Abstract. We consider a model initial and boundary value problem for the wide-angle `parabolic' equation Lur = icu, the wide-angle `parabolic'equation of underwater acoustics. Given R > 0, µ 0, > 0, , and q real

Akrivis, Georgios

250

Parabolic resonances and instabilities Vered Rom-Kedara)  

E-Print Network (OSTI)

Parabolic resonances and instabilities Vered Rom-Kedara) Department of Applied Mathematics 1996; accepted for publication 30 August 1996 A parabolic resonance is formed when an integrable two-degrees-of-freedom d.o.f. Hamiltonian system possessing a circle of parabolic fixed points is perturbed. It is proved

251

PARABOLIC WAVE COMPUTATIONS IN NON-ORTHOGONAL COORDINATE  

E-Print Network (OSTI)

· PARABOLIC WAVE COMPUTATIONS IN NON-ORTHOGONAL COORDINATE SYSTEMS By James T. Kirby,1 Associate Member, ASCE ABSTRACT: A recent development of a parabolic equation method for wave prop- agation developed in applying the parabolic equation method (PEM) for surface wave propagation in non

Kirby, James T.

252

Elastic approximation for a solar parabolic February 29, 2012  

E-Print Network (OSTI)

Elastic approximation for a solar parabolic trough February 29, 2012 Gang Xiao (University of Nice, France) Abstract For the production of the reective surface of a solar parabolic trough concentrator energy solutions. Introduction A parabolic trough [8] is a concentrating solar thermal energy collector

Paris-Sud XI, Université de

253

High Temperature Materials Laboratory User Program: 19th Annual Report, October 1, 2005 - September 30, 2006  

SciTech Connect

Annual Report contains overview of the High Temperature Materials Laboratory User Program and includes selected highlights of user activities for FY2006. Report is submitted to individuals within sponsoring DOE agency and to other interested individuals.

Pasto, Arvid [ORNL

2007-08-01T23:59:59.000Z

254

Fuel Cell Technologies Office: 2009 High Temperature Membrane Working Group  

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

9 High Temperature 9 High Temperature Membrane Working Group Meeting Archives to someone by E-mail Share Fuel Cell Technologies Office: 2009 High Temperature Membrane Working Group Meeting Archives on Facebook Tweet about Fuel Cell Technologies Office: 2009 High Temperature Membrane Working Group Meeting Archives on Twitter Bookmark Fuel Cell Technologies Office: 2009 High Temperature Membrane Working Group Meeting Archives on Google Bookmark Fuel Cell Technologies Office: 2009 High Temperature Membrane Working Group Meeting Archives on Delicious Rank Fuel Cell Technologies Office: 2009 High Temperature Membrane Working Group Meeting Archives on Digg Find More places to share Fuel Cell Technologies Office: 2009 High Temperature Membrane Working Group Meeting Archives on AddThis.com...

255

On a parabolic operator of dissipative systems  

E-Print Network (OSTI)

A parabolic integro differential operator operator L suitable to describe many phenomena in various physical fields,is considered. By means of equivalence between L and the third order equation which describe the evolution inside an exponentially shaped Josephson junction (ESJJ), an asymptotic analysis for (ESJJ) is achieved, evaluating explicitly boundary contributions related to the Dirichlet problem.

Monica De Angelis

2013-07-07T23:59:59.000Z

256

Parabolic systems with coupled boundary conditions  

E-Print Network (OSTI)

We consider elliptic operators with operator-valued coefficients and discuss the associated parabolic problems. The unknowns are functions with values in a Hilbert space $W$. The system is equipped with a general class of coupled boundary conditions of the form $f_{|\\partial\\Omega}\\in \\mathcal Y$ and $\\frac{\\partial f}{\\partial \

Stefano Cardanobile; Delio Mugnolo

2008-12-19T23:59:59.000Z

257

High Temperature Interactions of Antimony with Nickel  

SciTech Connect

In this chapter, the surface and bulk interactions of antimony with the Ni-based anodes in solid oxide fuel cells (SOFC) will be discussed. High fuel flexibility is a significant advantage of SOFCs, allowing the direct use of fossil and bio fuels without a hydrogen separation unit. Synthesis gas derived from coal and biomass consists of a mixture of hydrogen, carbon monoxide, carbon dioxide, and steam, but finite amounts of tars and trace impurities such as S, Se, P, As, Sb, Cd, Pb, Cl, etc, are also always present. While synthesis gas is commonly treated with a series of chemical processes and scrubbers to remove the impurities, complete purification is not economical. Antimony is widely distributed in coals. During coal gasification antimony is volatilized, such that contact with the SOFC anodes and other SOFC parts, e.g., interconnect, current collecting wires, fuel gas supplying tubing, is most likely. This chapter addresses the following topics: high temperature Ni - Sb interactions; alteration phase, Ni3Sb, Ni5Sb2, NiSb, formation; thermochemical modeling; impact of Sb on the electrocatalytic activity of Ni toward the fuel oxidation and the presence of other impurities (sulfur, in particular); converted anode structural instability during long-term SOFC operation; comparison with nickel heterogeneous catalysts.

Marina, Olga A.; Pederson, Larry R.

2012-07-01T23:59:59.000Z

258

Urania vapor composition at very high temperatures  

SciTech Connect

Due to the chemically unstable nature of uranium dioxide its vapor composition at very high temperatures is, presently, not sufficiently studied though more experimental knowledge is needed for risk assessment of nuclear reactors. We used laser vaporization coupled to mass spectrometry of the produced vapor to study urania vapor composition at temperatures in the vicinity of its melting point and higher. The very good agreement between measured melting and freezing temperatures and between partial pressures measured on the temperature increase and decrease indicated that the change in stoichiometry during laser heating was very limited. The evolutions with temperature (in the range 2800-3400 K) of the partial pressures of the main vapor species (UO{sub 2}, UO{sub 3}, and UO{sub 2}{sup +}) were compared with theoretically predicted evolutions for equilibrium noncongruent gas-liquid and gas-solid phase coexistences and showed very good agreement. The measured main relative partial pressure ratios around 3300 K all agree with calculated values for total equilibrium between condensed and vapor phases. It is the first time the three main partial pressure ratios above stoichiometric liquid urania have been measured at the same temperature under conditions close to equilibrium noncongruent gas-liquid phase coexistence.

Pflieger, Rachel [Institute for Transuranium Elements, Joint Research Centre, European Commission, P.O. Box 2340, 76125 Karlsruhe (Germany); Marcoule Institute for Separation Chemistry (ICSM), UMR 5257, CEA-CNRS-UMII-ENSCM, Bagnols sur Ceze Cedex (France); Colle, Jean-Yves [Institute for Transuranium Elements, Joint Research Centre, European Commission, P.O. Box 2340, 76125 Karlsruhe (Germany); Iosilevskiy, Igor [Joint Institute for High Temperature, Russian Academy of Science, 125412 Moscow (Russian Federation); Moscow Institute of Physics and Technology, State University, 141700 Moscow (Russian Federation); Extreme Matter Institute (EMMI), 64291 Darmstadt (Germany); Sheindlin, Michael [Institute for Transuranium Elements, Joint Research Centre, European Commission, P.O. Box 2340, 76125 Karlsruhe (Germany); Joint Institute for High Temperature, Russian Academy of Science, 125412 Moscow (Russian Federation)

2011-02-01T23:59:59.000Z

259

Effect of Environment and Microstructure on the High Temperature ...  

Science Conference Proceedings (OSTI)

EFFECT OF ENVIRONMENT AND MICROSTRUCTURE ON THE HIGH. TEMPERATURE BEHAVIOR OF ALLOY 718. E. Andrieu",. R. Cozar** and A. Pineau".

260

High Temperature Fatigue Life of Coated and Uncoated Valve ...  

Science Conference Proceedings (OSTI)

Symposium, Properties, Processing, and Performance of Steels and Ni-Based Alloys for Advanced Steam Conditions. Presentation Title, High Temperature ...

Note: This page contains sample records for the topic "include high-temperature parabolic" 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

Improved Growth of High-Temperature Superconductors with ...  

Visual Patent Search; Success Stories; News; Events; Electricity Transmission Improved Growth of High-Temperature Superconductors with HF Pressure ...

262

WEB RESOURCE: High Temperature Materials 21 Project (Phase 2)  

Science Conference Proceedings (OSTI)

Feb 10, 2007... thermal efficiency of power generation systems and advanced aeroengines. ... SOURCE: Harada, H. "High Temperature Materials 21 Project ...

263

A Possible Pressure-Induced High-Temperature-Superconducting  

Science Conference Proceedings (OSTI)

... Materials Forensics, Three-dimensional Modeling and Fractal Characterization · Vortex Physics in Oxide and Pnictide High Temperature Superconductors.

264

Oxygen Handling and Cooling Options in High Temperature Electrolysis Plants  

DOE Green Energy (OSTI)

Idaho National Laboratory is working on a project to generate hydrogen by high temperature electrolysis (HTE). In such an HTE system, safety precautions need to be taken to handle high temperature oxygen at ~830°C. This report is aimed at addressing oxygen handling in a HTE plant.. Though oxygen itself is not flammable, most engineering material, including many gases and liquids, will burn in the presence of oxygen under some favorable physicochemical conditions. At present, an absolute set of rules does not exist that can cover all aspects of oxygen system design, material selection, and operating practices to avoid subtle hazards related to oxygen. Because most materials, including metals, will burn in an oxygen-enriched environment, hazards are always present when using oxygen. Most materials will ignite in an oxygen-enriched environment at a temperature lower than that in air, and once ignited, combustion rates are greater in the oxygen-enriched environment. Even many metals, if ignited, burn violently in an oxygen-enriched environment. However, these hazards do not preclude the operations and systems involving oxygen. Oxygen can be safely handled and used if all the materials in a system are not flammable in the end-use environment or if ignition sources are identified and controlled. In fact, the incidence of oxygen system fires is reported to be low with a probability of about one in a million. This report is a practical guideline and tutorial for the safe operation and handling of gaseous oxygen in high temperature electrolysis system. The intent is to provide safe, practical guidance that permits the accomplishment of experimental operations at INL, while being restrictive enough to prevent personnel endangerment and to provide reasonable facility protection. Adequate guidelines are provided to govern various aspects of oxygen handling associated with high temperature electrolysis system to generate hydrogen. The intent here is to present acceptable oxygen standards and practices for minimum safety requirements. A summary of operational hazards, along with oxygen safety and emergency procedures, are provided.

Manohar S. Sohal; J. Stephen Herring

2008-07-01T23:59:59.000Z

265

Active devices for high temperature microcircuitry. [Silicon and gallium arsenide devices  

DOE Green Energy (OSTI)

As part of a program to develop high temperature electronics for geothermal well instrumentation, a number of solid state diode and transistor types were characterized from room temperature to 300/sup 0/C. The temperature dependence and aging stability of transport and leakage properties were measured. Included in the study were silicon diodes, bipolar transistors, JFETs, MOSFETs, and GaAs MESFETs and JFETs. In summary the results are: diodes and bipolar transistors became extremely leaky at high temperature and are therefore of limited use; silicon MOSFETs and GaAs devices showed unacceptable aging instabilities at high temperatures; silicon JFETs from certain manufacturers were sufficiently stable and had suitable temperature dependent characteristics so that operational circuits could be made. Comparisons were made of experimental device characteristics and those predicted by theory. The theoretical calculations were done using standard equations revised to include appropriate temperature dependent parameters. Close agreement between theory and experiment was found, indicating that unexpected high temperature effects were insignificant. In order to facilitate the use of devices in high temperature hybrids, it was necessary to develop bonding and prescreening techniques. A large variance of JFET 300/sup 0/C operating parameters was found even within a single production lot. Consequently, high temperature prescreening allowed each circuit to be specifically ''pretuned.'' Standard solder, epoxy, and chip and wire attachment technologies were not functional at 300/sup 0/C. Gold-germanium solder, aluminum wire to DuPont 9910 gold film, and diffusion barrier pads were developed to allow high temperature attachment.

Palmer, D.W.; Draper, B.L.; McBrayer, J.D.; White, K.R.

1978-02-01T23:59:59.000Z

266

High Temperature Electrolysis 4 kW Experiment Design, Operation, and Results  

SciTech Connect

This report provides results of long-term stack testing completed in the new high-temperature steam electrolysis multi-kW test facility recently developed at INL. The report includes detailed descriptions of the piping layout, steam generation and delivery system, test fixture, heat recuperation system, hot zone, instrumentation, and operating conditions. This facility has provided a demonstration of high-temperature steam electrolysis operation at the 4 kW scale with advanced cell and stack technology. This successful large-scale demonstration of high-temperature steam electrolysis will help to advance the technology toward near-term commercialization.

J.E. O'Brien; X. Zhang; K. DeWall; L. Moore-McAteer; G. Tao

2012-09-01T23:59:59.000Z

267

High Temperature Gas-cooled Reactor Projected Markets and Scoping Economics  

DOE Green Energy (OSTI)

The NGNP Project has the objective of developing the high temperature gas-cooled reactor (HTGR) technology to supply high temperature process heat to industrial processes as a substitute for burning of fossil fuels, such as natural gas. Applications of the HTGR technology that have been evaluated by the NGNP Project for supply of process heat include supply of electricity, steam and high-temperature gas to a wide range of industrial processes, and production of hydrogen and oxygen for use in petrochemical, refining, coal to liquid fuels, chemical, and fertilizer plants.

Larry Demick

2010-08-01T23:59:59.000Z

268

THE CHERN CHARACTER OF A PARABOLIC BUNDLE, AND A PARABOLIC REZNIKOV THEOREM IN THE CASE OF FINITE ORDER AT INFINITY  

E-Print Network (OSTI)

In this paper, we obtain an explicit formula for the Chern character of a locally abelian parabolic bundle in terms of its constituent bundles. Several features and variants of parabolic structures are discussed. Parabolic bundles arising from logarithmic connections form an important class of examples. As an application, we consider the situation when the local monodromies are semi-simple and are of finite order at infinity. In this case the parabolic Chern classes of the associated locally abelian parabolic bundle are deduced to be zero in the rational Deligne cohomology in degrees ? 2.

Jaya Nn Iyer; Carlos T Simpson

2007-01-01T23:59:59.000Z

269

Fig. 1. Artist's concept of the 1-D parabolic cylinder reflector. The re-flector has a parabolic shape in the short dimension and a flat profile in  

E-Print Network (OSTI)

Fig. 1. Artist's concept of the 1-D parabolic cylinder reflector. The re- flector has a parabolic [1]. A stationary linear parabolic reflector with a diameter of 1.6 m and a length of 2 m would

Ruf, Christopher

270

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

271

Piecewise parabolic negative magnetoresistance of two-dimensional electron gas with triangular antidot lattice  

SciTech Connect

Extraordinary piecewise parabolic behavior of the magnetoresistance has been experimentally detected in the two-dimensional electron gas with a dense triangular lattice of antidots, where commensurability magnetoresistance oscillations are suppressed. The magnetic field range of 0-0.6 T can be divided into three wide regions, in each of which the magnetoresistance is described by parabolic dependences with high accuracy (comparable to the experimental accuracy) and the transition regions between adjacent regions are much narrower than the regions themselves. In the region corresponding to the weakest magnetic fields, the parabolic behavior becomes almost linear. The observed behavior is reproducible as the electron gas density changes, which results in a change in the resistance by more than an order of magnitude. Possible physical mechanisms responsible for the observed behavior, including so-called 'memory effects,' are discussed.

Budantsev, M. V., E-mail: budants@isp.nsc.ru; Lavrov, R. A.; Pogosov, A. G.; Zhdanov, E. Yu.; Pokhabov, D. A. [Russian Academy of Sciences, Rzhanov Institute of Semiconductor Physics, Siberian Branch (Russian Federation)

2011-02-15T23:59:59.000Z

272

Analysis of the influence of geography and weather on parabolic trough solar collector design  

DOE Green Energy (OSTI)

The potential performance of single-axis tracking parabolic trough solar collectors as a function of optical energy distribution and receiver size has been calculated for eleven sites using typical meteorological year input data. A simulation based on the SOLTES code was developed which includes the three-dimensional features of a parabolic trough and calculates the thermooptical tradeoffs. The capability of the thermooptical model has been confirmed by the comparison of calculated results with the experimental results from an all-day test of a parabolic trough. The results from this eleven-site analysis indicate a potential performance superiority of a north-south horizontal axis trough and, in addition, a high quality (optical error, sigma/sub system/ less than or equal to 0.007 radian) collector should be of the same geometric design for all of the sites investigated and probably for all regions of the country.

Treadwell, G.W.; Grandjean, N.R.; Biggs, F.

1980-03-01T23:59:59.000Z

273

Fusion reactors-high temperature electrolysis (HTE)  

DOE Green Energy (OSTI)

Results of a study to identify and develop a reference design for synfuel production based on fusion reactors are given. The most promising option for hydrogen production was high-temperature electrolysis (HTE). The main findings of this study are: 1. HTE has the highest potential efficiency for production of synfuels from fusion; a fusion to hydrogen energy efficiency of about 70% appears possible with 1800/sup 0/C HTE units and 60% power cycle efficiency; an efficiency of about 50% possible with 1400/sup 0/C HTE units and 40% power cycle efficiency. 2. Relative to thermochemical or direct decomposition methods HTE technology is in a more advanced state of development, 3. Thermochemical or direct decomposition methods must have lower unit process or capital costs if they are to be more attractive than HTE. 4. While design efforts are required, HTE units offer the potential to be quickly run in reverse as fuel cells to produce electricity for restart of Tokamaks and/or provide spinning reserve for a grid system. 5. Because of the short timescale of the study, no detailed economic evaluation could be carried out.A comparison of costs could be made by employing certain assumptions. For example, if the fusion reactor-electrolyzer capital installation is $400/(KW(T) ($1000/KW(E) equivalent), the H/sub 2/ energy production cost for a high efficiency (about 70 %) fusion-HTE system is on the same order of magnitude as a coal based SNG plant based on 1976 dollars. 6. The present reference design indicates that a 2000 MW(th) fusion reactor could produce as much at 364 x 10/sup 6/ scf/day of hydrogen which is equivalent in heating value to 20,000 barrels/day of gasoline. This would fuel about 500,000 autos based on average driving patterns. 7. A factor of three reduction in coal feed (tons/day) could be achieved for syngas production if hydrogen from a fusion-HTE system were used to gasify coal, as compared to a conventional syngas plant using coal-derived hydrogen.

Fillo, J.A. (ed.)

1978-01-01T23:59:59.000Z

274

Advanced High Temperature Reactor Systems and Economic Analysis  

SciTech Connect

The Advanced High Temperature Reactor (AHTR) is a design concept for a large-output [3400 MW(t)] fluoride-salt-cooled high-temperature reactor (FHR). FHRs, by definition, feature low-pressure liquid fluoride salt cooling, coated-particle fuel, a high-temperature power cycle, and fully passive decay heat rejection. The AHTR's large thermal output enables direct comparison of its performance and requirements with other high output reactor concepts. As high-temperature plants, FHRs can support either high-efficiency electricity generation or industrial process heat production. The AHTR analysis presented in this report is limited to the electricity generation mission. FHRs, in principle, have the potential to be low-cost electricity producers while maintaining full passive safety. However, no FHR has been built, and no FHR design has reached the stage of maturity where realistic economic analysis can be performed. The system design effort described in this report represents early steps along the design path toward being able to predict the cost and performance characteristics of the AHTR as well as toward being able to identify the technology developments necessary to build an FHR power plant. While FHRs represent a distinct reactor class, they inherit desirable attributes from other thermal power plants whose characteristics can be studied to provide general guidance on plant configuration, anticipated performance, and costs. Molten salt reactors provide experience on the materials, procedures, and components necessary to use liquid fluoride salts. Liquid metal reactors provide design experience on using low-pressure liquid coolants, passive decay heat removal, and hot refueling. High temperature gas-cooled reactors provide experience with coated particle fuel and graphite components. Light water reactors (LWRs) show the potentials of transparent, high-heat capacity coolants with low chemical reactivity. Modern coal-fired power plants provide design experience with advanced supercritical-water power cycles. The current design activities build upon a series of small-scale efforts over the past decade to evaluate and describe the features and technology variants of FHRs. Key prior concept evaluation reports include the SmAHTR preconceptual design report,1 the PB-AHTR preconceptual design, and the series of early phase AHTR evaluations performed from 2004 to 2006. This report provides a power plant-focused description of the current state of the AHTR. The report includes descriptions and sizes of the major heat transport and power generation components. Component configuration and sizing are based upon early phase AHTR plant thermal hydraulic models. The report also provides a top-down AHTR comparative economic analysis. A commercially available advanced supercritical water-based power cycle was selected as the baseline AHTR power generation cycle both due to its superior performance and to enable more realistic economic analysis. The AHTR system design, however, has several remaining gaps, and the plant cost estimates consequently have substantial remaining uncertainty. For example, the enriched lithium required for the primary coolant cannot currently be produced on the required scale at reasonable cost, and the necessary core structural ceramics do not currently exist in a nuclear power qualified form. The report begins with an overview of the current, early phase, design of the AHTR plant. Only a limited amount of information is included about the core and vessel as the core design and refueling options are the subject of a companion report. The general layout of an AHTR system and site showing the relationship of the major facilities is then provided. Next is a comparative evaluation of the AHTR anticipated performance and costs. Finally, the major system design efforts necessary to bring the AHTR design to a pre-conceptual level are then presented.

Holcomb, David Eugene [ORNL; Peretz, Fred J [ORNL; Qualls, A L [ORNL

2011-09-01T23:59:59.000Z

275

High-temperature liquid--metal MHD generator experiments  

DOE Green Energy (OSTI)

Detailed data were obtained for the world's first high-temperature two-phase liquid--metal MHD generator under open-circuit conditions. Both single-phase (sodium) and two-phase (sodium and nitrogen) flows were used in the temperture range of approx. 490 to approx. 740/sup 0/K. The data presented includes pressures, voltages, and slip ratios (ratio of gas velocity to liquid velocity). The two-phase pressure--gradient data were predicted well by a simplified two-phase MHD correlation that includes the effect of a pure-liquid shunt layer between the electrodes. The slip ratio is shown to decrease with increasing temperature, implying higher generator and system efficiencies; this anticipated result was a prime reason for performing these experiments.

Dunn, P.F.; Pierson, E.S.; Staffon, J.D.

1979-01-01T23:59:59.000Z

276

Validation of the FLAGSOL parabolic trough solar power plant performance model  

DOE Green Energy (OSTI)

This paper describes the results of a validation of the FLAGSOL parabolic trough solar power plant performance model. The validation was accomplished by simulating an operating solar electric generating system (SEGS) parabolic trough solar thermal power plant and comparing the model output results with actual plant operating data. This comparison includes instantaneous, daily, and annual total solar thermal electric output, gross solar electric generation, and solar mode parasitic electric consumption. The results indicate that the FLAGSOL model adequately predicts the gross solar electric output of an operating plant, both on a daily and an annual basis.

Price, H.W. [National Renewable Energy Lab., Golden, CO (United States); Svoboda, P. [Flachglas-Solartechnik GmbH, Koeln (Germany); Kearney, D. [Kearney and Associates, Del Mar, CA (United States)

1994-10-01T23:59:59.000Z

277

Parabolic Sturmians approach to the three-body continuum Coulomb problem  

E-Print Network (OSTI)

The three-body continuum Coulomb problem is treated in terms of the generalized parabolic coordinates. Approximate solutions are expressed in the form of a Lippmann-Schwinger type equation, where the Green's function includes the leading term of the kinetic energy and the total potential energy, whereas the potential contains the non-orthogonal part of the kinetic energy operator. As a test of this approach, the integral equation for the $(e^-,\\, e^-,\\, {{He}^{++}})$ system is solved numerically by using the parabolic Sturmian basis representation of the (approximate) potential. Convergence of the expansion coefficients of the solution is obtained as the basis set used to describe the potential is enlarged.

S. A. Zaytsev; Yu. V. Popov; B. Piraux

2011-08-19T23:59:59.000Z

278

High pressure-high temperature effect on the HTSC ceramics structure and properties  

Science Conference Proceedings (OSTI)

Keywords: high pressures-high temperatures, high temperature superconductors, mechanical properties, structure, superconductive

T. A. Prikhna

1995-12-01T23:59:59.000Z

279

Analytic Models of High-Temperature Hohlraums  

SciTech Connect

A unified set of high-temperature-hohlraum models has been developed. For a simple hohlraum, P{sub s} = [A{sub s}+(1{minus}{alpha}{sub W})A{sub W}+A{sub H}]{sigma}T{sub R}{sup 4} + (4V{sigma}/c)(dT{sub R}{sup r}/dt) where P{sub S} is the total power radiated by the source, A{sub s} is the source area, A{sub W} is the area of the cavity wall excluding the source and holes in the wall, A{sub H} is the area of the holes, {sigma} is the Stefan-Boltzmann constant, T{sub R} is the radiation brightness temperature, V is the hohlraum volume, and c is the speed of light. The wall albedo {alpha}{sub W} {triple_bond} (T{sub W}/T{sub R}){sup 4} where T{sub W} is the brightness temperature of area A{sub W}. The net power radiated by the source P{sub N} = P{sub S}-A{sub S}{sigma}T{sub R}{sup 4}, which suggests that for laser-driven hohlraums the conversion efficiency {eta}{sub CE} be defined as P{sub N}/P{sub LASER}. The characteristic time required to change T{sub R}{sup 4} in response to a change in P{sub N} is 4V/C[(l{minus}{alpha}{sub W})A{sub W}+A{sub H}]. Using this model, T{sub R}, {alpha}{sub W}, and {eta}{sub CE} can be expressed in terms of quantities directly measurable in a hohlraum experiment. For a steady-state hohlraum that encloses a convex capsule, P{sub N} = {l_brace}(1{minus}{alpha}{sub W})A{sub W}+A{sub H}+[(1{minus}{alpha}{sub C})(A{sub S}+A{sub W}{alpha}{sub W})A{sub C}/A{sub T}]{r_brace}{sigma}T{sub RC}{sup 4} where {alpha}{sub C} is the capsule albedo, A{sub C} is the capsule area, A{sub T} {triple_bond} (A{sub S}+A{sub W}+A{sub H}), and T{sub RC} is the brightness temperature of the radiation that drives the capsule. According to this relation, the capsule-coupling efficiency of the baseline National-Ignition-Facility (NIF) hohlraum is 15% higher than predicted by previous analytic expressions. A model of a hohlraum that encloses a z pinch is also presented.

Stygar, W.A.; Olson, R.E.; Spielman, R.B.; Leeper, R.J.

2000-11-29T23:59:59.000Z

280

Parabolic Trough Organic Rankine Cycle Power Plant  

DOE Green Energy (OSTI)

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 "include high-temperature parabolic" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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281

Fuel Cell Technologies Office: 2005 High Temperature Membrane Working Group  

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

About About Printable Version Share this resource Send a link to Fuel Cell Technologies Office: 2005 High Temperature Membrane Working Group Meeting Archives to someone by E-mail Share Fuel Cell Technologies Office: 2005 High Temperature Membrane Working Group Meeting Archives on Facebook Tweet about Fuel Cell Technologies Office: 2005 High Temperature Membrane Working Group Meeting Archives on Twitter Bookmark Fuel Cell Technologies Office: 2005 High Temperature Membrane Working Group Meeting Archives on Google Bookmark Fuel Cell Technologies Office: 2005 High Temperature Membrane Working Group Meeting Archives on Delicious Rank Fuel Cell Technologies Office: 2005 High Temperature Membrane Working Group Meeting Archives on Digg Find More places to share Fuel Cell Technologies Office: 2005 High

282

Fuel Cell Technologies Office: 2004 High Temperature Membrane Working Group  

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

About About Printable Version Share this resource Send a link to Fuel Cell Technologies Office: 2004 High Temperature Membrane Working Group Meeting Archives to someone by E-mail Share Fuel Cell Technologies Office: 2004 High Temperature Membrane Working Group Meeting Archives on Facebook Tweet about Fuel Cell Technologies Office: 2004 High Temperature Membrane Working Group Meeting Archives on Twitter Bookmark Fuel Cell Technologies Office: 2004 High Temperature Membrane Working Group Meeting Archives on Google Bookmark Fuel Cell Technologies Office: 2004 High Temperature Membrane Working Group Meeting Archives on Delicious Rank Fuel Cell Technologies Office: 2004 High Temperature Membrane Working Group Meeting Archives on Digg Find More places to share Fuel Cell Technologies Office: 2004 High

283

Fuel Cell Technologies Office: 2010 High Temperature Membrane Working Group  

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

About About Printable Version Share this resource Send a link to Fuel Cell Technologies Office: 2010 High Temperature Membrane Working Group Meeting Archives to someone by E-mail Share Fuel Cell Technologies Office: 2010 High Temperature Membrane Working Group Meeting Archives on Facebook Tweet about Fuel Cell Technologies Office: 2010 High Temperature Membrane Working Group Meeting Archives on Twitter Bookmark Fuel Cell Technologies Office: 2010 High Temperature Membrane Working Group Meeting Archives on Google Bookmark Fuel Cell Technologies Office: 2010 High Temperature Membrane Working Group Meeting Archives on Delicious Rank Fuel Cell Technologies Office: 2010 High Temperature Membrane Working Group Meeting Archives on Digg Find More places to share Fuel Cell Technologies Office: 2010 High

284

Fuel Cell Technologies Office: 2007 High Temperature Membrane Working Group  

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

About About Printable Version Share this resource Send a link to Fuel Cell Technologies Office: 2007 High Temperature Membrane Working Group Meeting Archives to someone by E-mail Share Fuel Cell Technologies Office: 2007 High Temperature Membrane Working Group Meeting Archives on Facebook Tweet about Fuel Cell Technologies Office: 2007 High Temperature Membrane Working Group Meeting Archives on Twitter Bookmark Fuel Cell Technologies Office: 2007 High Temperature Membrane Working Group Meeting Archives on Google Bookmark Fuel Cell Technologies Office: 2007 High Temperature Membrane Working Group Meeting Archives on Delicious Rank Fuel Cell Technologies Office: 2007 High Temperature Membrane Working Group Meeting Archives on Digg Find More places to share Fuel Cell Technologies Office: 2007 High

285

Heat transfer mechanism with thin filaments including ceramic high temperature heat exchanger  

DOE Patents (OSTI)

A radiative heat transfer mechanism in a furnace having burners through which pulverized coal and air are burned producing combustion gases and contaminants. A plurality of elongated conduits are positioned inside the furnace proximate to the burners generally parallel to the flow of combustion gases in the furnace. A plurality of thin filaments are inside each of the elongated hollow conduits, the filaments having diameters in the range of from about 1 micrometer to about 1,000 micrometers and having an infrared radiation cross-section sufficient to cause the filaments to heat upon exposure to infrared radiation. Blower mechanism is associated with the elongated conduits for limiting the amount of soot and ash which deposit on the conduits to preserve the radiative and convective transfer of heat energy from the combustion gases to the conduits.

Im, Kwan H. (Naperville, IL); Ahluwalia, Rajesh K. (Burr Ridge, IL)

1994-01-01T23:59:59.000Z

286

Heat transfer mechanism with thin filaments including ceramic high temperature heat exchanger  

DOE Patents (OSTI)

A radiative heat transfer mechanism in a furnace is described having burners through which pulverized coal and air are burned producing combustion gases and contaminants. A plurality of elongated conduits are positioned inside the furnace proximate to the burners generally parallel to the flow of combustion gases in the furnace. A plurality of thin filaments are inside each of the elongated hollow conduits, the filaments having diameters in the range of from about 1 micrometer to about 1,000 micrometers and having an infrared radiation cross-section sufficient to cause the filaments to heat upon exposure to infrared radiation. Blower mechanism is associated with the elongated conduits for limiting the amount of soot and ash which deposit on the conduits to preserve the radiative and convective transfer of heat energy from the combustion gases to the conduits. 7 figs.

Im, K.H.; Ahluwalia, R.K.

1994-10-18T23:59:59.000Z

287

High temperature, minimally invasive optical sensing modules  

DOE Patents (OSTI)

A remote temperature sensing system includes a light source selectively producing light at two different wavelengths and a sensor device having an optical path length that varies as a function of temperature. The sensor receives light emitted by the light source and redirects the light along the optical path length. The system also includes a detector receiving redirected light from the sensor device and generating respective signals indicative of respective intensities of received redirected light corresponding to respective wavelengths of light emitted by the light source. The system also includes a processor processing the signals generated by the detector to calculate a temperature of the device.

Riza, Nabeel Agha (Oviedo, FL); Perez, Frank (Tujunga, CA)

2008-02-05T23:59:59.000Z

288

Hydrogen production from fusion reactors coupled with high temperature electrolysis  

SciTech Connect

An initial study was conducted on a fusion reactor and high temperature electrolyzer system for the production of synthetic fuel. The design temperatures in the fusion reactor blanket were above 1380/sup 0/C. Electrolytic hydrogen production at the high temperatures consumes a high ratio of thermal to electric energy and increases the efficiency of the plant and an overall efficiency of approximately 50% appeared possible. The concepts of the system and the design considerations of the high temperature electrolyzer will be presented.

Isaacs, H.S.; Fillo, J.A.; Dang, V.; Powell, J.R.; Steinberg, M.; Salzano, F.; Benenati, R.

1978-01-01T23:59:59.000Z

289

First high-temperature electronics products survey 2005.  

Science Conference Proceedings (OSTI)

On April 4-5, 2005, a High-Temperature Electronics Products Workshop was held. This workshop engaged a number of governmental and private industry organizations sharing a common interest in the development of commercially available, high-temperature electronics. One of the outcomes of this meeting was an agreement to conduct an industry survey of high-temperature applications. This report covers the basic results of this survey.

Normann, Randy Allen

2006-04-01T23:59:59.000Z

290

Potential impact of high temperature superconductors on maglev transportation  

DOE Green Energy (OSTI)

This report describes the potential impact that high-temperature superconductors (HTSs) may have on transportation by magnetically levitated vehicles. It is not intended as a planning document, but rather as an overview of potential HTS applications to magnetic-levitation (maglev) transportation. The present maglev program in the United States is summarized, and the present status of development of HTSs is described. Areas identified for possible impact on maglev technology are (1) liquid-nitrogen-cooled levitation magnets, (2) magnetic-field shielding of the passenger compartment, (3) superconducting magnetic energy storage for wayside power, (4) superconducting bearings for flywheel energy storage for wayside power, (5) downleads to continuously powered liquid-helium-cooled levitation magnets, and (6) liquid-hydrogen-cooled levitation magnets and linear motor propulsion windings. Major technical issues that remain to be resolved for the use of HTSs in maglev applications include thermal magnetic stability, mechanical properties, and critical current density at liquid-nitrogen temperatures.

Hull, J.R.

1992-02-01T23:59:59.000Z

291

High temperature gas reactor and energy pipeline system  

SciTech Connect

Under contract to the General Electric Co. as a part of a DOE-sponsored program, the Energy Systems Analysis Group at the Institute of Gas Technology examined the following aspects of the high temperature gas reactor closed loop chemical energy pipeline concept: (1) pipeline transmission and storage system design; (2) pipeline and storage system cost; (3) methane reformer interface; and (4) system safety and environmental aspects. This work focuses on the pipeline and storage system concepts, pipeline size, compressor power, and storage facility requirements were developed for 4 different types of pipeline systems to obtain system cost estimates. Each pipeline system includes a synthesis-gas pipeline from the reformer to the methanator, a methane-rich gas pipeline from the methanator to the reformer, a water return line from the methanator to the reformer, and storage for the synthesis gas, methane-rich gas and water.

Daniels, E.; Blazek, C.; Pflasterer, G.R.; Allen, D.C.

1981-01-01T23:59:59.000Z

292

High temperature gas reactor and energy pipeline system  

DOE Green Energy (OSTI)

A study was made of the following aspects of the High Temperature Gas Reactor (HTGR) Closed Loop Chemical Energy Pipeline (CEP) concept: pipeline transmission and storage system design, pipeline and storage system cost, methane reformer interface, and system safety and environmental aspects. This paper focuses on the pipeline and storage system concepts. Pipeline size, compressor power, and storage facility requirements were developed for four different types of pipeline systems to obtain system cost estimates. Each pipeline system includes a synthesis-gas pipeline from the reformer to the methanator, a methane-rich gas pipeline from the methanator to the reformer, a water return line from the methanator to the reformer, and storage for the synthesis gas, methane-rich gas and water.

Daniels, E.; Blazek, C.; Allen, D.C.; Pflasterer, G.R.

1980-12-19T23:59:59.000Z

293

NOVEL REFRACTORY MATERIALS FOR HIGH ALKALI, HIGH TEMPERATURE ENVIRONMENTS  

Science Conference Proceedings (OSTI)

Refractory materials can be limited in their application by many factors including chemical reactions between the service environment and the refractory material, mechanical degradation of the refractory material by the service environment, temperature limitations on the use of a particular refractory material, and the inability to install or repair the refractory material in a cost effective manner or while the vessel was in service. The objective of this project was to address the need for new innovative refractory compositions by developing a family of novel MgO-Al 2O3 spinel or other similar magnesia/alumina containing unshaped refractory composition (castables, gunnables, shotcretes, etc) utilizing new aggregate materials, bond systems, protective coatings, and phase formation techniques (in-situ phase formation, altered conversion temperatures, accelerated reactions, etc). This family of refractory compositions would then be tailored for use in high-temperature, high-alkaline industrial environments like those found in the aluminum, chemical, forest products, glass, and steel industries.

Hemrick, James Gordon [ORNL

2011-09-01T23:59:59.000Z

294

The DARPA manufacturing initiative in high temperature superconductivity  

SciTech Connect

The Defense Advanced Research Projects Agency (DARPA) has a very aggressive Technology Base program in high temperature superconductivity. This program is expected to provide the basis for a specialized set of military products - passive microwave and millimeter wave devices - within the next three years. In order to get these high leverage products into military systems, a manufacturing base must be developed for HTSC components. A plan for DARPA in HTSC manufacturing is directly coupled with the ongoing DARPA materials and device oriented R and D program. In essence, this plan recommends a three phased effort: 1. Phase I (two years); Fund companies through R and D contracts for specialized HTSC components; prepare a detailed plan and develop an HTSC consortium. 2. Phase II (six years): Establish an HTSC Sematech initiative for electronic applications, including active devices. 3. Phase III (optional): Continue the HTSC Sematech with emphasis on high power applications.

Adams, K.R. (Defense Advanced Research Projects Agency DARPA (US))

1989-01-01T23:59:59.000Z

295

High Temperature Chemical Kinetic Combustion Modeling of Lightly Methylated Alkanes  

DOE Green Energy (OSTI)

Conventional petroleum jet and diesel fuels, as well as alternative Fischer-Tropsch (FT) fuels and hydrotreated renewable jet (HRJ) fuels, contain high molecular weight lightly branched alkanes (i.e., methylalkanes) and straight chain alkanes (n-alkanes). Improving the combustion of these fuels in practical applications requires a fundamental understanding of large hydrocarbon combustion chemistry. This research project presents a detailed high temperature chemical kinetic mechanism for n-octane and three lightly branched isomers octane (i.e., 2-methylheptane, 3-methylheptane, and 2,5-dimethylhexane). The model is validated against experimental data from a variety of fundamental combustion devices. This new model is used to show how the location and number of methyl branches affects fuel reactivity including laminar flame speed and species formation.

Sarathy, S M; Westbrook, C K; Pitz, W J; Mehl, M

2011-03-01T23:59:59.000Z

296

2nd International Symposium on High-Temperature Metallurgical ...  

Science Conference Proceedings (OSTI)

Aug 2, 2010... with reduced energy consumption and reduced emission of pollutants. ... A Breakthrough Application of Electricity at High Temperature for ...

297

Ionic Solid Oxides for High Temperature Optical Gas Sensing in ...  

Science Conference Proceedings (OSTI)

Presentation Title, Ionic Solid Oxides for High Temperature Optical Gas Sensing in Fossil Fuel Based Power Plants. Author(s), Junhang Dong, Xiling Tang, Kurtis  ...

298

High Temperature Modules and Materials for Thermoelectric Power ...  

Science Conference Proceedings (OSTI)

We fabricated oxide-based thermoelectric modules for high temperature electrical-power generation. Potentials for a development of a thermoelectric generation ...

299

Environmental Degradation and Protection of High Temperature Alloys  

Science Conference Proceedings (OSTI)

Scope, Nickel-base superalloys and other high temperature alloys have been successfully used in turbine engine propulsion, power generation and many other ...

300

Evaluation of High-Temperature Alloys for Helium Gas Turbines  

Science Conference Proceedings (OSTI)

C. 1. Mechanical Property / Status of Metallic Materials Development for Application in Advanced High-Temperature Gas-Cooled Reactor / Material

Wolfgang Jakobeit; Jörn-Peter Pfeifer; Georg Ullrich

Note: This page contains sample records for the topic "include high-temperature parabolic" 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

Corrosion of Candidate Alloys in High Temperature Supercritical  

Science Conference Proceedings (OSTI)

Materials corrosion in high temperature supercritical CO2 will be an important consideration for this application. The results of corrosion evaluations of a wide ...

302

Fracturing fluid high-temperature breaker for improving well performance  

Science Conference Proceedings (OSTI)

Oxidative breakers are currently being used in fracturing treatments to reduce polymeric gel damage in high-temperature reservoirs. Dissolved high-temperature oxidative breakers are very reactive at high temperatures (275 to 350 F), typically requiring less than 0.25 lbm/1,000 gal of fluid. Recent introduction of a new nonpersulfate oxidative high-temperature encapsulated breaker (HTEB) provides controlled degradation of the fracturing fluid polymers. Laboratory tests show viscosity reduction and delayed release of active oxidizer breaker. HTEB conductivity data show a two-fold increase in retained permeability at 300 F in a borate-crosslinked fluid system.

McConnell, B.

1994-05-01T23:59:59.000Z

303

Fuel Cell Technologies Office: 2006 High Temperature Membrane...  

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

Systems for High Temperature, Low Relative Humidity Polymer-Type Membranes, Andrew Herring, Colorado School of Mines (PDF 213 KB) Design and Development of High-Performance...

304

High-temperature Erosion Behavior of Aluminide-coated Turbine ...  

Science Conference Proceedings (OSTI)

The high-temperature erosion behavior of an aluminide-coated turbine blade ... The Tensile Property Of A Gas Turbine Engine Fan Blade And Casing Material.

305

Available Technologies: High Temperature Strain Cell for X-ray ...  

High Temperature Strain Cell for X-ray ... Six hexapole infrared lamps focus inside the sample chamber onto a ceramic material sample with a spherical ...

306

Advanced High Temperature Corrosion and Wear Resistant Internal ...  

Science Conference Proceedings (OSTI)

Presentation Title, Advanced High Temperature Corrosion and Wear Resistant Internal Coating for Oil Industry applications. Author(s), William Boardman, Rahul  ...

307

Processing of High-temperature Structural Materials I  

Science Conference Proceedings (OSTI)

Subsurface Alloy Microstructural Changes During High Temperature Reaction of Fe-Cr Alloys in CO2: David Young1; Thuan Nguyen1; Jianqiang Zhang1; ...

308

Creep Behavior of High Temperature Alloys for Generation IV ...  

Science Conference Proceedings (OSTI)

Presentation Title, Creep Behavior of High Temperature Alloys for Generation IV Nuclear Power Plant Applications. Author(s), Xingshuo Wen, Laura J. Carroll, ...

309

High-Temperature Reactor for Diffuse Reflectance Infrared ...  

High-Temperature Reactor for Diffuse Reflectance Infrared Fourier-Transform Spectroscopy Note: The technology described above is an early stage ...

310

High Temperature Fatigue Behavior of Laser Shock Peened ...  

Science Conference Proceedings (OSTI)

Presentation Title, High Temperature Fatigue Behavior of Laser Shock Peened IN718Plus Superalloy. Author(s), Vibhor Chaswal, S R Mannava, Dong Qian, ...

311

Direct Fired Reciprocating Engine and Bottoming High Temperature...  

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

exhaust is split between fuel feeds and air feeds to the high temperature fuel cell. NOX reduction can be achieved using an autothermal reformer. By hybridizing the production...

312

High-temperature Material Systems for Energy Conversion and ...  

Science Conference Proceedings (OSTI)

Ionic Solid Oxides for High Temperature Optical Gas Sensing in Fossil Fuel Based Power Plants · Mitigation of Chromium Poisoning in Solid Oxide Fuel Cell

313

High-Temperature Lead-Free Solder Alternatives: Possibilities and ...  

Science Conference Proceedings (OSTI)

The development of high-temperature lead-free solders has become an important issue for both the electronics and automobile industries because of the health ...

314

High Temperature Stainless Steel Alloy with Low Cost Manganese  

High Temperature Stainless Steel Alloy with Low Cost Manganese ... ••Power industry components such as boiler tubing and piping, pressure vessels, chemical

315

Creep Behavior of High Temperature Alloys for Intermediate Heat ...  

Science Conference Proceedings (OSTI)

Presentation Title, Creep Behavior of High Temperature Alloys for Intermediate Heat Exchanger in Next Generation Nuclear Plant. Author(s), Xingshuo Wen, ...

316

SLAC National Accelerator Laboratory - High-temperature Superconductor...  

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

evidence yet that a puzzling gap in the electronic structures of some high-temperature superconductors could indicate a new phase of matter. Understanding this "pseudogap" has...

317

High Temperature Universal Silicon on Insulator (SOI) Gate Drive  

higher current drive, on-chip regulation capacitors, and more space efficient and robust on-chip layout. ... •Development of high temperature galvanic isolation

318

High-temperature Foam-reinforced Thermal Insulation  

Science Conference Proceedings (OSTI)

Symposium, Advanced Materials for Harsh Environments. Presentation Title, High-temperature Foam-reinforced Thermal Insulation. Author(s), Jacob J. Stiglich, ...

319

Poincar'e polynomial of the moduli spaces of parabolic bundles  

E-Print Network (OSTI)

Poincar'e polynomial of the moduli spaces of parabolic bundles Yogish I. Holla March 7, 2000 School of the moduli spaces of semi­stable parabolic bundles on a curve. The quasi parabolic analogue of the Siegel for determine the Betti numbers of the moduli of semistable parabolic bundles on a curve (when parabolic semi

Holla, Yogish I.

320

High temperature methods for forming oxidizer fuel  

DOE Patents (OSTI)

A method of treating a formation fluid includes providing formation fluid from a subsurface in situ heat treatment process. The formation fluid is separated to produce a liquid stream and a first gas stream. The first gas stream includes carbon dioxide, hydrogen sulfide, hydrocarbons, hydrogen or mixtures thereof. Molecular oxygen is separated from air to form a molecular oxygen stream comprising molecular oxygen. The first gas stream is combined with the molecular oxygen stream to form a combined stream comprising molecular oxygen and the first gas stream. The combined stream is provided to one or more downhole burners.

Bravo, Jose Luis (Houston, TX)

2011-01-11T23:59:59.000Z

Note: This page contains sample records for the topic "include high-temperature parabolic" 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

Optimal Heat Collection Element Shapes for Parabolic Trough Concentrators  

DOE Green Energy (OSTI)

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

322

Bio-Fuel Production Assisted with High Temperature Steam Electrolysis  

SciTech Connect

Two hybrid energy processes that enable production of synthetic liquid fuels that are compatible with the existing conventional liquid transportation fuels infrastructure are presented. Using biomass as a renewable carbon source, and supplemental hydrogen from high-temperature steam electrolysis (HTSE), these two hybrid energy processes have the potential to provide a significant alternative petroleum source that could reduce dependence on imported oil. The first process discusses a hydropyrolysis unit with hydrogen addition from HTSE. Non-food biomass is pyrolyzed and converted to pyrolysis oil. The pyrolysis oil is upgraded with hydrogen addition from HTSE. This addition of hydrogen deoxygenates the pyrolysis oil and increases the pH to a tolerable level for transportation. The final product is synthetic crude that could then be transported to a refinery and input into the already used transportation fuel infrastructure. The second process discusses a process named Bio-Syntrolysis. The Bio-Syntrolysis process combines hydrogen from HTSE with CO from an oxygen-blown biomass gasifier that yields syngas to be used as a feedstock for synthesis of liquid synthetic crude. Conversion of syngas to liquid synthetic crude, using a biomass-based carbon source, expands the application of renewable energy beyond the grid to include transportation fuels. It can also contribute to grid stability associated with non-dispatchable power generation. The use of supplemental hydrogen from HTSE enables greater than 90% utilization of the biomass carbon content which is about 2.5 times higher than carbon utilization associated with traditional cellulosic ethanol production. If the electrical power source needed for HTSE is based on nuclear or renewable energy, the process is carbon neutral. INL has demonstrated improved biomass processing prior to gasification. Recyclable biomass in the form of crop residue or energy crops would serve as the feedstock for this process. A process model of syngas production using high temperature electrolysis and biomass gasification is presented. Process heat from the biomass gasifier is used to heat steam for the hydrogen production via the high temperature steam electrolysis process. Oxygen produced form the electrolysis process is used to control the oxidation rate in the oxygen-blown biomass gasifier.

Grant Hawkes; James O'Brien; Michael McKellar

2012-06-01T23:59:59.000Z

323

Hydrogen Removal From Heating Oil of a Parabolic Trough ...  

Hydrogen Removal From Heating Oil of a Parabolic Trough Increases the Life of the Trough and its Components A Method to Selectively Remove & Measure Hydrogen Gas from ...

324

Parabolic Trough Solar Thermal Electric Power Plants (Fact Sheet)  

DOE Green Energy (OSTI)

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

325

Hydrogen Removal From Heating Oil of a Parabolic Trough ...  

A Method to Selectively Remove & Measure Hydrogen Gas from a Fluid Volume Parabolic trough power plants use concentrated solar thermal energy to ...

326

Estimates in the Generalized Morrey Space for Linear Parabolic Systems.  

E-Print Network (OSTI)

??The purpose of the this paper is to study the parabolic system uti - D_?(aij??D_?uj) = -div fi in the generalized Morrey Space L_?2,? .… (more)

McBride, Matthew Scott

2007-01-01T23:59:59.000Z

327

Long-term average performance benefits of parabolic trough improvements  

DOE Green Energy (OSTI)

Improved parabolic trough concentrating collectors will result from better design, improved fabrication techniques, and the development and utilization of improved materials. This analysis quantifies the relative merit of various technological advancements in improving the long-term average performance of parabolic trough concentrating collectors and presents them graphically as a function of operating temperature for north-south, east-west, and polar mounted parabolic troughs. Substantial annual energy gains (exceeding 50% at 350/sup 0/C) are shown to be attainable with improved parabolic troughs.

Gee, R.; Gaul, H.; Kearney, D.; Rabl, A.

1979-10-01T23:59:59.000Z

328

Simplified Methodology for Designing Parabolic Trough Solar Power Plants.  

E-Print Network (OSTI)

??The performance of parabolic trough based solar power plants over the last 25 years has proven that this technology is an excellent alternative for the… (more)

Vasquez Padilla, Ricardo

2011-01-01T23:59:59.000Z

329

Parabolic trough solar collectors : design for increasing efficiency.  

E-Print Network (OSTI)

??Parabolic trough collectors are a low cost implementation of concentrated solar power technology that focuses incident sunlight onto a tube filled with a heat transfer… (more)

Figueredo, Stacy L. (Stacy Lee), 1981-

2011-01-01T23:59:59.000Z

330

Simplified Methodology for Designing Parabolic Trough Solar Power Plants.  

E-Print Network (OSTI)

?? The performance of parabolic trough based solar power plants over the last 25 years has proven that this technology is an excellent alternative for… (more)

Vasquez Padilla, Ricardo

2011-01-01T23:59:59.000Z

331

post-pareto analysis for multiobjective parabolic control systems  

E-Print Network (OSTI)

Jul 29, 2012 ... POST-PARETO ANALYSIS FOR MULTIOBJECTIVE PARABOLIC CONTROL SYSTEMS. Henri Bonnel (bonnel ***at*** univ-nc.nc). Abstract: In ...

332

Field Survey of Parabolic Trough Receiver Thermal Performance: Preprint  

SciTech Connect

This paper describes a technique that uses an infrared camera to evaluate the in-situ thermal performance of parabolic trough receivers at operating solar power plants.

Price, H.; Forristall, R.; Wendelin, T.; Lewandowski, A.; Moss, T.; Gummo, C.

2006-04-01T23:59:59.000Z

333

High temperature electronics and instrumentation seminar proceedings  

DOE Green Energy (OSTI)

This seminar was tailored to address the needs of the borehole logging industry and to stimulate the development and application of this technology, for logging geothermal, hot oil and gas, and steam injection wells. The technical sessions covered the following topics: hybrid circuits, electronic devices, transducers, cables and connectors, materials, mechanical tools and thermal protection. Thirty-eight papers are included. Separate entries were prepared for each one. (MHR)

Veneruso, A.F.; Arnold, C.; Simpson, R.S. (eds.)

1980-05-01T23:59:59.000Z

334

High pressure/high temperature thermogravimetric apparatus. Final report  

DOE Green Energy (OSTI)

The purpose of this instrumentation grant was to acquire a state-of-the-art, high pressure, high temperature thermogravimetric apparatus (HP/HT TGA) system for the study of the interactions between gases and carbonaceous solids for the purpose of solving problems related to coal utilization and applications of carbon materials. The instrument that we identified for this purpose was manufactured by DMT (Deutsche Montan Technologies)--Institute of Cokemaking and Coal Chemistry of Essen, Germany. Particular features of note include: Two reactors: a standard TGA reactor, capable of 1100 C at 100 bar; and a high temperature (HT) reactor, capable of operation at 1600 C and 100 bar; A steam generator capable of generating steam to 100 bar; Flow controllers and gas mixing system for up to three reaction gases, plus a separate circuit for steam, and another for purge gas; and An automated software system for data acquisition and control. The HP/TP DMT-TGA apparatus was purchased in 1996 and installed and commissioned during the summer of 1996. The apparatus was located in Room 128 of the Prince Engineering Building at Brown University. A hydrogen alarm and vent system were added for safety considerations. The system has been interfaced to an Ametek quadruple mass spectrometer (MA 100), pumped by a Varian V250 turbomolecular pump, as provided for in the original proposed. With this capability, a number of gas phase species of interest can be monitored in a near-simultaneous fashion. The MS can be used in a few different modes. During high pressure, steady-state gasification experiments, it is used to sample, measure, and monitor the reactant/product gases. It can also be used to monitor gas phase species during nonisothermal temperature programmed reaction (TPR) or temperature programmed desorption (TPD) experiments.

Calo, J.M.; Suuberg, E.M.

1999-12-01T23:59:59.000Z

335

The experimental evaluation and application of high temperature solid lubricants  

Science Conference Proceedings (OSTI)

A research program meant to develop an understanding of high temperature solid lubrication and experimental techniques through the development of a composite lubricant coating system was described. The knowledge gained through this research was then applied to a specific engineering challenge, the tribology of a sliding seal for hypersonic flight vehicles. The solid lubricant coating is a chromium carbide based composite combined with silver, which acts as a low temperature lubricant, and barium fluoride/calcium fluoride eutectic, which acts as a high temperature lubricant. This composite coating provides good wear resistance and low friction for sliding contacts from room temperature to over 900 C in reducing or oxidative environments. The specific research on this coating included a composition screening using a foil gas bearing test rig and the use of thin silver films to reduce initial wear using a pin-on-disk test rig. The chemical stability of the materials used was also addressed. This research indicated that soft metallic films and materials which become soft at elevated temperatures are potentially good lubricants. The general results from the experiments with the model solid libricant coating were then applied to a sliding seal design concept. This seal design requires that a braided ceramic fabric slide against a variety of metal counterface materials at temperatures from 25 to 850 C in an oxidative environment. A pin-on-disk tribometer was used to evaluate the tribological properties of these materials and to develop lubrication techniques. The results indicate that these materials must be lubricated to prevent wear and reduce friction. Thin films of silver, gold and calcium fluoride provided lubrication to the sliding materials. The data obtained and the lubrication techniques developed provide important information to designers of sliding seals.

Dellacorte, C.

1989-01-01T23:59:59.000Z

336

Quantum tunneling, quantum computing, and high temperature superconductivity  

E-Print Network (OSTI)

In this dissertation, I have studied four theoretical problems in quantum tunneling, quantum computing, and high-temperature superconductivity. I have developed a generally-useful numerical tool for analyzing impurity-induced resonant-state images observed with scanning tunneling microscope (STM) in high temperature superconductors. The integrated tunneling intensities on all predominant sites have been estimated. The results can be used to test the predictions of any tight-binding model calculation. I have numerically simulated two-dimensional time-dependent tunneling of a Gaussian wave packet through a barrier, which contains charged ions. We have found that a negative ion in the barrier directly below the tunneling tip can deflect the tunneling electrons and drastically reduce the probability for them to reach the point in the target plane directly below the tunneling tip. I have studied an infinite family of sure-success quantum algorithms, which are introduced by C.-R. Hu [Phys. Rev. A {\\bf 66}, 042301 (2002)], for solving a generalized Grover search problem. Rigorous proofs are found for several conjectures made by Hu and explicit equations are obtained for finding the values of two phase parameters which make the algorithms sure success. Using self-consistent Hartree-Fock theory, I have studied an extended Hubbard model which includes quasi-long-range Coulomb interaction between the holes (characterized by parameter V). I have found that for sufficiently large V/t, doubly-charged-antiphase-island do become energetically favored localized objects in this system for moderate values of U/t, thus supporting a recent conjecture by C.-R. Hu [Int. J. Mod. Phys. B {\\bf 17}, 3284 (2003)].

Wang, Qian

2003-12-01T23:59:59.000Z

337

Supercell Depletion Studies for Prismatic High Temperature Reactors  

SciTech Connect

The traditional two-step method of analysis is not accurate enough to represent the neutronic effects present in the prismatic high temperature reactor concept. The long range coupling of the various regions in high temperature reactors poses a set of challenges that are not seen in either LWRs or fast reactors. Unlike LWRs, which exhibit large, localized effects, the dominant effects in PMRs are, for the most part, distributed over larger regions, but with lower magnitude. The 1-D in-line treatment currently used in pebble bed reactor analysis is not sufficient because of the 2-D nature of the prismatic blocks. Considerable challenges exist in the modeling of blocks in the vicinity of reflectors, which, for current small modular reactor designs with thin annular cores, include the majority of the blocks. Additional challenges involve the treatment of burnable poisons, operational and shutdown control rods. The use of a large domain for cross section preparation provides a better representation of the neutron spectrum, enables the proper modeling of BPs and CRs, allows the calculation of generalized equivalence theory parameters, and generates a relative power distribution that can be used in compact power reconstruction. The purpose of this paper is to quantify the effects of the reflector, burnable poison, and operational control rods on an LEU design and to delineate an analysis approach for the Idaho National Laboratory. This work concludes that the use of supercells should capture these long-range effects in the preparation of cross sections and along with a set of triangular meshes to treat BPs, and CRs a high fidelity neutronics computation is attainable.

J. Ortensi

2012-10-01T23:59:59.000Z

338

High Temperature, Buried Permanent Magnet, Brushless DC Motor  

E-Print Network (OSTI)

A high temperature magnetic bearing system using high temperature permanent magnets from Electron Energy Corporation (EEC) is under development. The system consists of two radial bearings, one thrust bearing, two radial catcher bearings and one motor. The purpose of this research is to develop one of the critical components of the system, namely, the High Temperature Permanent Magnet motor. A novel High Temperature Permanent Magnet (HTPM) Brushless DC(BLDC) motor capable of operating at 1000 degrees F (538 degrees C) is designed. HTPMs developed at Electron Energy Corporation are buried into the rotor. The high temperature motor is designed to produce 5.1kw of power at a top running speed of 20000 rpm. The numerical values of the motor voltage, power and torque output are predicted from calculations of the nonlinear finite element model of the motor. The motor stator is wound, potted, cured and high potential tested at 1000 degrees F. A servo amplifier from Advanced Motion Control is used to drive the high temperature motor. High temperature displacement sensors are set up for sensing the rotor position to form a closed loop motion control. However, the noise problem of the high temperature sensors causes a failure of this approach. An open loop approach is then developed and this approach succeeds in spinning the rotor with the capability of self-starting. The status of the full system assembling is introduced. Some other components of the system are briefly presented.

Zhang, Zhengxin

2010-08-01T23:59:59.000Z

339

Overview of High-Temperature Electrolysis for Hydrogen Production  

SciTech Connect

Over the last five years there has been a growing interest in the use of hydrogen as an energy carrier, particularly to augment transportation fuels and thus reduce our dependence on imported petroleum. Hydrogen is now produced primarily via steam reforming of methane. However, in the long term, methane reforming is not a viable process for the large-scale hydrogen production since such fossil fuel conversion processes consume non-renewable resources and emit greenhouse gases. Nuclear energy can be used to produce hydrogen without consuming fossil fuels and without emitting greenhouse gases through the splitting of water into hydrogen and oxygen. The Nuclear Hydrogen Initiative of the DOE Office of Nuclear Energy is developing three general categories of high temperature processes for hydrogen production: thermochemical, electrolytic and hybrid thermo-electrolytic. This paper introduces the work being done in the development of high temperature electrolysis of steam. High Temperature Electrolysis (HTE) is built on the technology of solid oxide fuel cells (SOFCs), which were invented over a century ago, but which have been most vigorously developed during the last twenty years. SOFCs consume hydrogen and oxygen and produce steam and electricity. Solid Oxide Electrolytic Cells (SOECs) consume electricity and steam and produce hydrogen and oxygen. The purpose of the HTE research is to solve those problems unique to the electrolytic mode of operation, while building further on continuing fuel cell development. ORGANIZATION Experiments have been conducted for the last three years at the Idaho National Laboratory and at Ceramatec, Inc. on the operation of button cells and of progressively larger stacks of planar cells. In addition, the INL has been performing analyses of the cell-scale fluid dynamics and plant-scale flowsheets in order to determine optimum operating conditions and plant configurations. Argonne National Laboratory has been performing experiments for the development of new electrode materials, as well as modeling of the fluid dynamics and flowsheets for comparison with the work being done at the INL. ANL has also been performing diagnostic measures on components form long-duration tests at the INL and Ceramatec to determine the causes for the slow degradation in cell performance. Oak Ridge National Laboratory has been developing high temperature porous membranes for the separation of hydrogen from the residual steam, thus avoiding the need to condense and reheat the steam. The University of Nevada at Las Vegas has been collaborating with ANL on the development of electrode and electrolyte materials and will soon begin to investigate the causes of cell degradation. HTE research also includes NERI projects at the Virginia Polytechnic Institute on the development of toughened SOEC composite seals and at the Georgia Institute of Technology on the microstructural design of SOEC materials. EXPERIMENTAL RESULTS The most recent large-scale test of HTE was performed from June 28 through Sept 22, 2006 at the Ceramatec plant in Salt Lake City. The test apparatus consists of two stacks of 60 cells each in a configuration that will be used in the Integrated Laboratory Scale (ILS) experiment during FY-07. The ILS will contain three modules of four stacks each. The “Half-Module” initially produced 1.2 normal m3of H2/hour and 0.65 Nm3/hr at the end of the 2040-hour continuous test.

Herring, J. S.; O' Brien, J. E.; Stoots, C. M.; Hartvigsen, J. J.; Petri, M. C.; Carter, J. D.; Bischoff, B. L.

2007-06-01T23:59:59.000Z

340

Alignment method for parabolic trough solar concentrators  

DOE Patents (OSTI)

A Theoretical Overlay Photographic (TOP) alignment method uses the overlay of a theoretical projected image of a perfectly aligned concentrator on a photographic image of the concentrator to align the mirror facets of a parabolic trough solar concentrator. The alignment method is practical and straightforward, and inherently aligns the mirror facets to the receiver. When integrated with clinometer measurements for which gravity and mechanical drag effects have been accounted for and which are made in a manner and location consistent with the alignment method, all of the mirrors on a common drive can be aligned and optimized for any concentrator orientation.

Diver, Richard B. (Albuquerque, NM)

2010-02-23T23:59:59.000Z

Note: This page contains sample records for the topic "include high-temperature parabolic" 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

Numerical Schemes for Rough Parabolic Equations  

SciTech Connect

This paper is devoted to the study of numerical approximation schemes for a class of parabolic equations on (0,1) perturbed by a non-linear rough signal. It is the continuation of Deya (Electron. J. Probab. 16:1489-1518, 2011) and Deya et al. (Probab. Theory Relat. Fields, to appear), where the existence and uniqueness of a solution has been established. The approach combines rough paths methods with standard considerations on discretizing stochastic PDEs. The results apply to a geometric 2-rough path, which covers the case of the multidimensional fractional Brownian motion with Hurst index H>1/3.

Deya, Aurelien, E-mail: deya@iecn.u-nancy.fr [Universite de Nancy 1, Institut Elie Cartan Nancy (France)

2012-04-15T23:59:59.000Z

342

DEGENERATE-PARABOLIC PARTIAL DIFFERENTIAL EQUATIONS WITH UNBOUNDED COEFFICIENTS, MARTINGALE PROBLEMS, AND A  

E-Print Network (OSTI)

DEGENERATE-PARABOLIC PARTIAL DIFFERENTIAL EQUATIONS WITH UNBOUNDED COEFFICIENTS, MARTINGALE four intertwined problems, motivated by mathematical finance, concerning degenerate-parabolic partial differential operators and degenerate diffusion processes. First, we consider a parabolic partial differential

343

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

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

Parabolic-Trough Solar Water Heating--FTA, 022798m FTA trough Parabolic-Trough Solar Water Heating--FTA, 022798m FTA trough Federal Technology Alert covers parabolic-trough solar...

344

Development of high temperature catalytic membrane reactors  

DOE Green Energy (OSTI)

Significant progress was made in 1991 on the development of ceramic membranes as catalytic reactors. Efforts were focused on the design, construction and startup of a reactor system capable of duplicating relevant commercial operating conditions. With this system, yield enhancement was demonstrated for the dehydrogenation of ethylbenzene to styrene in a membrane reactor compared to the standard packed bed configuration. This enhancement came with no loss in styrene selectivity. During operation, coke deposition on the membrane was observed, but this deposition was mitigated by the presence of steam in the reaction mixture and a steady state permeability was achieved for run times in excess of 200 hours. Work began on optimizing the membrane reactor by exploring several parameters including the effect of N{sub 2} diluent in the reaction feed and the effect of a N{sub 2} purge on the permeate side of the membrane. This report details the experimental progress made in 1991. Interactions with the University of Wisconsin on this project are also summarized. Finally, current status of the project and next steps are outlined.

Not Available

1992-02-01T23:59:59.000Z

345

High Temperature Oxidation Issues in Fossil Boilers  

SciTech Connect

This report covers the conclusion of a multi-year project that examined the oxidation resistance of Al-rich coatings and a new project examining the effect of higher CO{sub 2} contents on corrosion mechanisms in oxy-fired coal-fueled boilers. The coating work primarily examined diffusion coatings for the steam side of typical ferritic (9-12%Cr) and austenitic (e.g., Type 304L) tube materials in accelerated testing at 650-800 C in wet air. The final phase of this work has attempted to obtain additional coating failures to determine a critical Al content (at coating failure) as a function of exposure temperature. However, no failures have been observed for austenitic substrates including >25 kh at 700 C and >6 kh at 800 C. Preliminary results are presented from the oxy-firing project, where the initial focus is on ferritic alloys. Initial coal-ash experiments were conducted at 600 C to evaluate some of the test parameters and three different levels of CO{sub 2} were investigated. An in-situ creep rig is being constructed to evaluate the effect of environment on creep properties. Initial ex-situ creep experiments are presented as a baseline.

Pint, Bruce A [ORNL; Bestor, Michael A [ORNL; Dryepondt, Sebastien N [ORNL; Zhang, Ying [Tennessee Technological University

2010-01-01T23:59:59.000Z

346

DEGRADATION ISSUES IN SOLID OXIDE CELLS DURING HIGH TEMPERATURE ELECTROLYSIS  

DOE Green Energy (OSTI)

Idaho National Laboratory (INL) is performing high-temperature electrolysis research to generate hydrogen using solid oxide electrolysis cells (SOECs). The project goals are to address the technical and degradation issues associated with the SOECs. This paper provides a summary of various ongoing INL and INL sponsored activities aimed at addressing SOEC degradation. These activities include stack testing, post-test examination, degradation modeling, and a list of issues that need to be addressed in future. Major degradation issues relating to solid oxide fuel cells (SOFC) are relatively better understood than those for SOECs. Some of the degradation mechanisms in SOFCs include contact problems between adjacent cell components, microstructural deterioration (coarsening) of the porous electrodes, and blocking of the reaction sites within the electrodes. Contact problems include delamination of an electrode from the electrolyte, growth of a poorly (electronically) conducting oxide layer between the metallic interconnect plates and the electrodes, and lack of contact between the interconnect and the electrode. INL's test results on high temperature electrolysis (HTE) using solid oxide cells do not provide a clear evidence whether different events lead to similar or drastically different electrochemical degradation mechanisms. Post-test examination of the solid oxide electrolysis cells showed that the hydrogen electrode and interconnect get partially oxidized and become non-conductive. This is most likely caused by the hydrogen stream composition and flow rate during cool down. The oxygen electrode side of the stacks seemed to be responsible for the observed degradation due to large areas of electrode delamination. Based on the oxygen electrode appearance, the degradation of these stacks was largely controlled by the oxygen electrode delamination rate. University of Utah (Virkar) has developed a SOEC model based on concepts in local thermodynamic equilibrium in systems otherwise in global thermodynamic non-equilibrium. This model is under continued development. It shows that electronic conduction through the electrolyte, however small, must be taken into account for determining local oxygen chemical potential, within the electrolyte. The chemical potential within the electrolyte may lie out of bounds in relation to values at the electrodes in the electrolyzer mode. Under certain conditions, high pressures can develop in the electrolyte just under the oxygen electrode (anode)/electrolyte interface, leading to electrode delamination. This theory is being further refined and tested by introducing some electronic conduction in the electrolyte.

M. S. Sohal; J. E. O'Brien; C. M. Stoots; V. I. Sharma; B. Yildiz; A. Virkar

2012-02-01T23:59:59.000Z

347

Overview of software development at the Parabolic Dish Test Site  

DOE Green Energy (OSTI)

The development history of the data acquisition and data analysis software is discussed in this report. The software development occurred between 1978 and 1984 in support of solar energy module testing at the Jet Propulsion Laboratory's Parabolic Dish Test Site, located within Edwards Test Station. The development went through incremental stages, starting with a simple single-user BASIC set of programs, and progressing to the relative complex multi-user FORTRAN system that was used until the termination of the project. Additional software in support of testing is discussed including software in support of the meteorological subsystem and the Test Bed Concentrator Control Console interface. Conclusions and recommendations for further development are discussed.

Miyazono, C.K.

1985-07-15T23:59:59.000Z

348

PARABOLIC DELIGNE-LUSZTIG VARIETIES. FRANCOIS DIGNE AND JEAN MICHEL  

E-Print Network (OSTI)

PARABOLIC DELIGNE-LUSZTIG VARIETIES. FRANC¸OIS DIGNE AND JEAN MICHEL Abstract. Motivated by the Brou´e conjecture on blocks with abelian defect groups for finite reductive groups, we study "parabolic of a braid monoid, whose action on their -adic cohomology will conjecturally factor trough a cyclotomic Hecke

349

A new parabolic trough solar collector P. Kohlenbach1  

E-Print Network (OSTI)

) power generation system. The parabolic trough collectors have been installed in the National Solar-selective paint. The absorber operates in a 50mm non-evacuated glass tube to minimize convection losses. Thermal and power generation (CHP), CSIRO has built a solar thermal parabolic trough collector field which

350

An Optical Characterization Technique for Parabolic Trough Solar Collectors Using Images of the Absorber Reection.  

E-Print Network (OSTI)

?? As the concentrating solar power industry competes to develop a less-expensive parabolic trough collector, assurance is needed that new parabolic trough collectors maintain accurate… (more)

Owkes, Jeanmarie Kathleen

2013-01-01T23:59:59.000Z

351

Method for Synthesizing Extremeley High Temperature Melting Materials  

DOE Patents (OSTI)

The invention relates to a method of synthesizing high-temperature melting materials. More specifically the invention relates to a containerless method of synthesizing very high temperature melting materials such as borides, carbides and transition-metal, lanthanide and actinide oxides, using an Aerodynamic Levitator and a laser. The object of the invention is to provide a method for synthesizing extremely high-temperature melting materials that are otherwise difficult to produce, without the use of containers, allowing the manipulation of the phase (amorphous/crystalline/metastable) and permitting changes of the environment such as different gaseous compositions.

Saboungi, Marie-Louise and Glorieux, Benoit

2005-11-22T23:59:59.000Z

352

Advancing the technology base for high-temperature membranes  

DOE Green Energy (OSTI)

This is the final report of a two-year, Laboratory Directed Research and Development (LDRD) project at the Los Alamos National Laboratory (LANL). This project addresses the major issues confronting the implementation of high-temperature membranes for separations and catalysis. We are pursuing high-temperature membrane systems that can have a large impact for DOE and be industrially relevant. A major obstacle for increased use of membranes is that most applications require the membrane material to withstand temperatures above those acceptable for polymer-based systems. Advances made by this project have helped industry and DOE move toward high-temperature membrane applications to improve overall energy efficiency.

Dye, R.C.; Birdsell, S.A.; Snow, R.C. [and others

1997-10-01T23:59:59.000Z

353

Facility Configuration Study of the High Temperature Gas-Cooled Reactor Component Test Facility  

Science Conference Proceedings (OSTI)

A test facility, referred to as the High Temperature Gas-Cooled Reactor Component Test Facility or CTF, will be sited at Idaho National Laboratory for the purposes of supporting development of high temperature gas thermal-hydraulic technologies (helium, helium-Nitrogen, CO2, etc.) as applied in heat transport and heat transfer applications in High Temperature Gas-Cooled Reactors. Such applications include, but are not limited to: primary coolant; secondary coolant; intermediate, secondary, and tertiary heat transfer; and demonstration of processes requiring high temperatures such as hydrogen production. The facility will initially support completion of the Next Generation Nuclear Plant. It will secondarily be open for use by the full range of suppliers, end-users, facilitators, government laboratories, and others in the domestic and international community supporting the development and application of High Temperature Gas-Cooled Reactor technology. This pre-conceptual facility configuration study, which forms the basis for a cost estimate to support CTF scoping and planning, accomplishes the following objectives: • Identifies pre-conceptual design requirements • Develops test loop equipment schematics and layout • Identifies space allocations for each of the facility functions, as required • Develops a pre-conceptual site layout including transportation, parking and support structures, and railway systems • Identifies pre-conceptual utility and support system needs • Establishes pre-conceptual electrical one-line drawings and schedule for development of power needs.

S. L. Austad; L. E. Guillen; D. S. Ferguson; B. L. Blakely; D. M. Pace; D. Lopez; J. D. Zolynski; B. L. Cowley; V. J. Balls; E.A. Harvego, P.E.; C.W. McKnight, P.E.; R.S. Stewart; B.D. Christensen

2008-04-01T23:59:59.000Z

354

Ionic liquids and ionic liquid acids with high temperature stability for fuel cell and other high temperature applications, method of making and cell employing same  

DOE Patents (OSTI)

Disclosed are developments in high temperature fuel cells including ionic liquids with high temperature stability and the storage of inorganic acids as di-anion salts of low volatility. The formation of ionically conducting liquids of this type having conductivities of unprecedented magnitude for non-aqueous systems is described. The stability of the di-anion configuration is shown to play a role in the high performance of the non-corrosive proton-transfer ionic liquids as high temperature fuel cell electrolytes. Performance of simple H.sub.2(g) electrolyte/O.sub.2(g) fuel cells with the new electrolytes is described. Superior performance both at ambient temperature and temperatures up to and above 200.degree. C. are achieved. Both neutral proton transfer salts and the acid salts with HSO.sup.-.sub.4 anions, give good results, the bisulphate case being particularly good at low temperatures and very high temperatures. The performance of all electrolytes is improved by the addition of a small amount of involatile base of pK.sub.a value intermediate between those of the acid and base that make the bulk electrolyte. The preferred case is the imidazole-doped ethylammonium hydrogensulfate which yields behavior superior in all respects to that of the industry standard phosphoric acid electrolyte.

Angell, C. Austen (Mesa, AZ); Xu, Wu (Broadview Heights, OH); Belieres, Jean-Philippe (Chandler, AZ); Yoshizawa, Masahiro (Tokyo, JP)

2011-01-11T23:59:59.000Z

355

DOE Hydrogen Analysis Repository: High Temperature Electrolysis (HTE)  

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

High Temperature Electrolysis (HTE) High Temperature Electrolysis (HTE) Project Summary Full Title: High Temperature Electrolysis (HTE) Project ID: 159 Principal Investigator: Steve Herring Brief Description: A three-dimensional computational fluid dynamics (CFD) model was created to model high-temperature steam electrolysis in a planar solid oxide electrolysis cell (SOEC). A solid-oxide fuel cell model adds the electrochemical reactions and loss mechanisms and computation of the electric field throughout the cell. Keywords: Solid oxide fuel cell; solid oxide elctrolysis cell; nuclear; model Purpose Assess the performance of solid-oxide cells operating in the steam electrolysis mode for hydrogen production over a temperature range of 800 to 900ºC. Performer Principal Investigator: Steve Herring

356

Fuel Cell Technologies Office: High Temperature Membrane Working Group  

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

High Temperature Membrane Working Group High Temperature Membrane Working Group The High Temperature Membrane Working Group consists of government, industry, and university researchers interested in developing high temperature membranes for fuel cells. Description Technical Targets Meetings Contacts Description Polymer electrolyte membrane (PEM) fuel cells typically operate at temperatures no higher than 60°C-80°C due to structural limitations of the membrane. Operating PEM fuel cell stacks at higher temperatures (120°C for transportation and 150°C for stationary applications), however, would yield significant energy benefits. For example, heat rejection is easier at higher temperatures, which would allow use of smaller heat exchangers in fuel cell power systems. In addition, for reformate fuel cell systems, carbon monoxide (CO) tolerance of the stack is less problematic at higher temperatures, which would reduce the size requirements or possibly eliminate the need for some CO clean-up beds in the fuel processor.

357

30vol%SiC at Ultra-high Temperatures  

Science Conference Proceedings (OSTI)

Presentation Title, SiC-depletion in ZrB2-30vol%SiC at Ultra-high Temperatures. Author(s), K N Shugart, E. J. Opila. On-Site Speaker (Planned), K N Shugart.

358

Enabling high-temperature nanophotonics for energy applications  

E-Print Network (OSTI)

The nascent field of high-temperature nanophotonics could potentially enable many important solid-state energy conversion applications, such as thermophotovoltaic energy generation, selective solar absorption, and selective ...

Yeng, YiXiang

359

Mold, flow, and economic considerations in high temperature precision casting  

E-Print Network (OSTI)

Casting high temperature alloys that solidify through a noticeable two phase region, specifically platinum-ruthenium alloys, is a particularly challenging task due to their high melting temperature and this necessitates ...

Humbert, Matthew S

2013-01-01T23:59:59.000Z

360

Cryogenic deformation of high temperature superconductive composite structures  

DOE Patents (OSTI)

An improvement in a process of preparing a composite high temperature oxide superconductive wire is provided and involves conducting at least one cross-sectional reduction step in the processing preparation of the wire at sub-ambient temperatures.

Roberts, Peter R. (Groton, MA); Michels, William (Brookline, MA); Bingert, John F. (Jemez Springs, NM)

2001-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "include high-temperature parabolic" 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

DEVELOPMENT OF HIGH TEMPERATURE ULTRASONIC TRANSDUCER FOR STRUCTURAL HEALTH MONITORING  

Science Conference Proceedings (OSTI)

Structural health monitoring (SHM) techniques are needed to maintain the reliability of aging power plants for long term operation. The high temperature transducers are necessary to realize SHM (monitor wall thickness of the pipings

A. Baba; C. T. Searfass; B. R. Tittmann

2011-01-01T23:59:59.000Z

362

Ir-based alloys for ultra-high temperature applications ...  

Site Map; Printable Version; Share this resource. Send a link to Ir-based alloys for ultra-high temperature applications - Energy Innovation Portalto someone by E-mail

363

Electronic properties of doped Mott insulators and high temperature superconductors  

E-Print Network (OSTI)

High-temperature superconducting cuprates, which are the quintessential example of a strongly correlated system and the most extensively studied materials after semiconductors, spurred the development in the fields of ...

Ribeiro, Tiago Castro

2005-01-01T23:59:59.000Z

364

Comparative Assessment of Direct Drive High Temperature Superconductin...  

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

Energy, LLC. Contract No. DE-AC36-08GO28308 Comparative Assessment of Direct Drive High Temperature Superconducting Generators in Multi-Megawatt Class Wind Turbines B....

365

Stability and quench protection of high-temperature superconductors  

E-Print Network (OSTI)

In the design and operation of a superconducting magnet, stability and protection are two key issues that determine the magnet's reliability and safe operation. Although the high-temperature superconductor (HTS) is considered ...

Ang, Ing Chea

2006-01-01T23:59:59.000Z

366

Toward material-specific simulations of high temperature superconductivity  

Science Conference Proceedings (OSTI)

High temperature superconductors could potentially revolutionize the use and transmission of electric power. This along with intriguing scientific questions have motivated an enormous research effort over the past twenty years, since the discovery of ...

Thomas C. Schulthess

2006-11-01T23:59:59.000Z

367

Dual-phase membrane for High temperature CO2 separation  

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

2 CO 2 High temp. membrane for CO 2 removal High Temperature CO 2 Selective Membranes Syngas gas CO 2 enriched gas CO 2 High pressure H 2 0 100 200 300 400 500 600 700 1 10 100...

368

HYFIRE: a tokamak/high-temperature electrolysis system  

DOE Green Energy (OSTI)

The HYFIRE studies to date have investigated a number of technical approaches for using the thermal energy produced in a high-temperature Tokamak blanket to provide the electrical and thermal energy required to drive a high-temperature (> 1000/sup 0/C) water electrolysis process. Current emphasis is on two design points, one consistent with electrolyzer peak inlet temperatures of 1400/sup 0/C, which is an extrapolation of present experience, and one consistent with a peak electrolyzer temperature of 1100/sup 0/C. This latter condition is based on current laboratory experience with high-temperature solid electrolyte fuel cells. Our major conclusion to date is that the technical integration of fusion and high-temperature electrolysis appears to be feasible and that overall hydrogen production efficiencies of 50 to 55% seem possible.

Fillo, J.A.; Powell, J.P.; Benenati, R.; Varljen, T.C.; Chi, J.W.H.; Karbowski, J.S.

1981-01-01T23:59:59.000Z

369

Computational and Experimental Development of Novel High-Temperature Alloys  

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

Development of Novel High-Temperature Alloys Background The need for fossil-fueled power plants to run cleaner and more efficiently leads toward ever-higher operating temperatures and pressures. Gas turbines, which can be fueled by natural gas, synthetic gas (syngas), or a high-hydrogen stream derived from coal, are critical components in this development. High-temperature operation of turbines is generally achieved by using nickel-chrome superalloys with coatings

370

Description of a high temperature downhole fluid sampler  

DOE Green Energy (OSTI)

Downhole fluid samplers have been used for years with limited success in high temperature geothermal wells. This paper discusses the development and operating principles of a high temperature downhole fluid sampler, reliable at obtaining samples at temperatures of up to 350/sup 0/C. The sampler was used successfully for recovering a brine sample from a depth of 10,200 ft in the Salton Sea Scientific Drilling Project well.

Solbau, R.; Weres, O.; Hansen, L.; Dudak, B.

1986-05-01T23:59:59.000Z

371

Utility-Scale Parabolic Trough Solar Systems: Performance Acceptance Test Guidelines, April 2009 - December 2010  

DOE Green Energy (OSTI)

Prior to commercial operation, large solar systems in utility-size power plants need to pass a performance acceptance test conducted by the engineering, procurement, and construction (EPC) contractor or owners. In lieu of the present absence of ASME or other international test codes developed for this purpose, the National Renewable Energy Laboratory has undertaken the development of interim guidelines to provide recommendations for test procedures that can yield results of a high level of accuracy consistent with good engineering knowledge and practice. The Guidelines contained here are specifically written for parabolic trough collector systems with a heat-transport system using a high-temperature synthetic oil, but the basic principles are relevant to other CSP systems.

Kearney, D.

2011-05-01T23:59:59.000Z

372

High Temperature Calcination - MACT Upgrade Equipment Pilot Plant Test  

SciTech Connect

About one million gallons of acidic, hazardous, and radioactive sodium-bearing waste are stored in stainless steel tanks at the Idaho Nuclear Technology and Engineering Center (INTEC), which is a major operating facility of the Idaho National Engineering and Environmental Laboratory. Calcination at high-temperature conditions (600 C, with alumina nitrate and calcium nitrate chemical addition to the feed) is one of four options currently being considered by the Department of Energy for treatment of the remaining tank wastes. If calcination is selected for future processing of the sodium-bearing waste, it will be necessary to install new off-gas control equipment in the New Waste Calcining Facility (NWCF) to comply with the Maximum Achievable Control Technology (MACT) standards for hazardous waste combustors and incinerators. This will require, as a minimum, installing a carbon bed to reduce mercury emissions from their current level of up to 7,500 to <45 {micro}g/dscm, and a staged combustor to reduce unburned kerosene fuel in the off-gas discharge to <100 ppm CO and <10 ppm hydrocarbons. The staged combustor will also reduce NOx concentrations of about 35,000 ppm by 90-95%. A pilot-plant calcination test was completed in a newly constructed 15-cm diameter calciner vessel. The pilot-plant facility was equipped with a prototype MACT off-gas control system, including a highly efficient cyclone separator and off-gas quench/venturi scrubber for particulate removal, a staged combustor for unburned hydrocarbon and NOx destruction, and a packed activated carbon bed for mercury removal and residual chloride capture. Pilot-plant testing was performed during a 50-hour system operability test January 14-16, followed by a 100-hour high-temperature calcination pilot-plant calcination run January 19-23. Two flowsheet blends were tested: a 50-hour test with an aluminum-to-alkali metal molar ratio (AAR) of 2.25, and a 50-hour test with an AAR of 1.75. Results of the testing indicate that sodium-bearing waste can be successfully calcined at 600 C with an AAR of 1.75. Unburned hydrocarbons are reduced to less than 10 ppm (7% O2, dry basis), with >90% reduction of NOx emissions. Mercury removal by the carbon bed reached 99.99%, surpassing the control efficiency needed to meet MACT emissions standards. No deleterious impacts on the carbon bed were observed during the tests. The test results imply that upgrading the NWCF calciner with a more efficient cyclone separator and the proposed MACT equipment can process the remaining tanks wastes in 3 years or less, and comply with the MACT standards.

Richard D. Boardman; B. H. O& #39; Brien; N. R. Soelberg; S. O. Bates; R. A. Wood; C. St. Michel

2004-02-01T23:59:59.000Z

373

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,

374

Advancement of High Temperature Black Liquor Gasification Technology  

DOE Green Energy (OSTI)

Weyerhaeuser operates the world's only commercial high-temperature black liquor gasifier at its pulp mill in New Bern, NC. The unit was started-up in December 1996 and currently processes about 15% of the mill's black liquor. Weyerhaeuser, Chemrec AB (the gasifier technology developer), and the U.S. Department of Energy recognized that the long-term, continuous operation of the New Bern gasifier offered a unique opportunity to advance the state of high temperature black liquor gasification toward the commercial-scale pressurized O2-blown gasification technology needed as a foundation for the Forest Products Bio-Refinery of the future. Weyerhaeuser along with its subcontracting partners submitted a proposal in response to the 2004 joint USDOE and USDA solicitation - 'Biomass Research and Development Initiative'. The Weyerhaeuser project 'Advancement of High Temperature Black Liquor Gasification' was awarded USDOE Cooperative Agreement DE-FC26-04NT42259 in November 2004. The overall goal of the DOE sponsored project was to utilize the Chemrec{trademark} black liquor gasification facility at New Bern as a test bed for advancing the development status of molten phase black liquor gasification. In particular, project tasks were directed at improvements to process performance and reliability. The effort featured the development and validation of advanced CFD modeling tools and the application of these tools to direct burner technology modifications. The project also focused on gaining a fundamental understanding and developing practical solutions to address condensate and green liquor scaling issues, and process integration issues related to gasifier dregs and product gas scrubbing. The Project was conducted in two phases with a review point between the phases. Weyerhaeuser pulled together a team of collaborators to undertake these tasks. Chemrec AB, the technology supplier, was intimately involved in most tasks, and focused primarily on the design, specification and procurement of facility upgrades. Chemrec AB is also operating a pressurized, O2-blown gasifier pilot facility in Piteaa, Sweden. There was an exchange of knowledge with the pressurized projects including utilization of the experimental results from facilities in Piteaa, Sweden. Resources at the Georgia Tech Research Corporation (GTRC, a.k.a., the Institute of Paper Science and Technology) were employed primarily to conduct the fundamental investigations on scaling and plugging mechanisms and characterization of green liquor dregs. The project also tapped GTRC expertise in the development of the critical underlying black liquor gasification rate subroutines employed in the CFD code. The actual CFD code development and application was undertaken by Process Simulation, Ltd (PSL) and Simulent, Ltd. PSL focused on the overall integrated gasifier CFD code, while Simulent focused on modeling the black liquor nozzle and description of the black liquor spray. For nozzle development and testing Chemrec collaborated with ETC (Energy Technology Centre) in Piteae utilizing their test facility for nozzle spray investigation. GTI (Gas Technology Institute), Des Plains, IL supported the team with advanced gas analysis equipment during the gasifier test period in June 2005.

Craig Brown; Ingvar Landalv; Ragnar Stare; Jerry Yuan; Nikolai DeMartini; Nasser Ashgriz

2008-03-31T23:59:59.000Z

375

A Process Model for the Production of Hydrogen Using High Temperature Electrolysis  

DOE Green Energy (OSTI)

High temperature electrolysis (HTE) involves the splitting of stream into hydrogen and oxygen at high temperatures. The primary advantage of HTE over conventional low temperature electrolysis is that considerably higher hydrogen production efficiencies can be achieved. Performing the electrolysis process at high temperatures results in more favorable thermodynamics for electrolysis, more efficient production of electricity, and allows direct use of process heat to generate steam. This paper presents the results of process analyses performed to evaluate the hydrogen production efficiencies of an HTE plant coupled to a 600 MWt Modular Helium Reactor (MHR) that supplies both the electricity and process heat needed to drive the process. The MHR operates with a coolant outlet temperature of 950 C. Approximately 87% of the high-temperature heat is used to generate electricity at high efficiency using a direct, Brayton-cycle power conversion system. The remaining high-temperature heat is used to generate a superheated steam / hydrogen mixture that is supplied to the electrolyzers. The analyses were performed using the HYSYS process modeling software. The model used to perform the analyses consisted of three loops; a primary high temperature helium loop, a secondary helium loop and the HTE process loop. The detailed model included realistic representations of all major components in the system, including pumps, compressors, heat exchange equipment, and the electrolysis stack. The design of the hydrogen production process loop also included a steam-sweep gas system to remove oxygen from the electrolysis stack so that it can be recovered and used for other applications. Results of the process analyses showed that hydrogen production efficiencies in the range of 45% to 50% are achievable with this system.

M. G. Mc Kellar; E. A. Harvego; M. Richards; A. Shenoy

2006-07-01T23:59:59.000Z

376

Gallium phosphide high-temperature bipolar junction transistor  

DOE Green Energy (OSTI)

Preliminary results are reported on the development of a high-temperature (> 350/sup 0/C) gallium phosphide bipolar junction transistor (BJT) for goethermal and other energy applications. This four-layer p/sup +/n/sup -/pp/sup +/ structure was fromed by liquid phase epitaxy using a supercooling technique to insure uniform nucleation of the thin layers. Magnesium was used as the p-type dopant to avoid excessive out-diffusion into the lightly doped base. By appropriate choice of electrodes, the device may also be driven as an n-channel junction field-effect transistor. The gallium phosphide BJT is observed to have a common-emitter current gain peaking in the range of 6 to 10 (for temperatures from 20/sup 0/C to 400/sup 0/C) and a room-temperature, punchthrough-limited, collector-emitter breakdown voltage of approximately -6V. Other parameters of interest include an f/sub/ = 400 KHz (at 20/sup 0/C) and a collector base leakage current = 200 ..mu..A (at 350/sup 0/C).

Zipperian, T.E.; Dawson, L.R.; Caffin, R.J.

1981-03-01T23:59:59.000Z

377

Protonation enthalpies of metal oxides from high temperature electrophoresis.  

Science Conference Proceedings (OSTI)

Surface protonation reactions play an important role in the behavior of mineral and colloidal systems, specifically in hydrothermal aqueous environments. However, studies addressing the reactions at the solid/liquid interface at temperatures above 100 C are scarce. In this study, newly and previously obtained high temperature electrophoresis data (up to 260 C) - zeta potentials and isoelectric points - for metal oxides, including SiO{sub 2}, SnO{sub 2}, ZrO{sub 2}, TiO{sub 2}, and Fe{sub 3}O{sub 4}, were used in thermodynamic analysis to derive the standard enthalpies of their surface protonation. Two different approaches were used for calculating the protonation enthalpy: one is based on thermodynamic description of the 1-pKa model for surface protonation, and another one - on a combination of crystal chemistry and solvation theories which link the relative permittivity of the solid phase and the ratio of the Pauling bond strength and bond length to standard protonation enthalpy. From this analysis, two expressions relating the protonation enthalpy to the relative permittivity of the solid phase were obtained.

Rodriguez-Santiago, V [Oak Ridge National Laboratory (ORNL); Fedkin, Mark V [ORNL; Lvov, Serguei N. [Pennsylvania State University

2012-01-01T23:59:59.000Z

378

Protonation enthalpies of metal oxides from high temperature electrophoresis  

SciTech Connect

Surface protonation reactions play an important role in the behavior of mineral and colloidal systems, specifically in hydrothermal aqueous environments. However, studies addressing the reactions at the solid/liquid interface at temperatures above 100 C are scarce. In this study, newly and previously obtained high temperature electrophoresis data (up to 260 C) zeta potentials and isoelectric points for metal oxides, including SiO2, SnO2, ZrO2, TiO2, and Fe3O4, were used in thermodynamic analysis to derive the standard enthalpies of their surface protonation. Two different approaches were used for calculating the protonation enthalpy: one is based on thermodynamic description of the 1-pKa model for surface protonation, and another one on a combination of crystal chemistry and solvation theories which link the relative permittivity of the solid phase and the ratio of the Pauling bond strength and bond length to standard protonation enthalpy. From this analysis, two expressions relating the protonation enthalpy to the relative permittivity of the solid phase were obtained.

Rodriguez-Santiago, V [Oak Ridge National Laboratory (ORNL); Fedkin, Mark V. [Pennsylvania State University; Lvov, Serguei N. [Pennsylvania State University

2012-01-01T23:59:59.000Z

379

Performance of digital integrated circuit technologies at very high temperatures  

Science Conference Proceedings (OSTI)

Results of investigations of the performance and reliability of digital bipolar and CMOS integrated circuits over the 25 to 340/sup 0/C range are reported. Included in these results are both parametric variation information and analysis of the functional failure mechanisms. Although most of the work was done using commercially available circuits (TTL and CMOS) and test chips from commercially compatible processes, some results of experimental simulations of dielectrically isolated CMOS are also discussed. It was found that commercial Schottky clamped TTL, and dielectrically isolated, low power Schottky-clamped TTL, functioned to junction temperatures in excess of 325/sup 0/C. Standard gold doped TTL functioned only to 250/sup 0/C, while commercial, isolated I/sup 2/L functioned to the range 250/sup 0/C to 275/sup 0/C. Commercial junction isolated CMOS, buffered and unbuffered, functioned to the range 280/sup 0/C to 310/sup 0/C/sup +/, depending on the manufacturer. Experimental simulations of simple dielectrically isolated CMOS integrated circuits, fabricated with heavier doping levels than normal, functioned to temperatures in excess of 340/sup 0/C. High temperature life testing of experimental, silicone-encapsulated simple TTL and CMOS integrated circuits have shown no obvious life limiting problems to date. No barrier to reliable functionality of TTL bipolar or CMOS integrated ciruits at temperatures in excess of 300/sup 0/C has been found.

Prince, J.L.; Draper, B.L.; Rapp, E.A.; Kromberg, J.N.; Fitch, L.T.

1980-01-01T23:59:59.000Z

380

Progress in BNL High-Temperature Hydrogen Combustion Research Program  

DOE Green Energy (OSTI)

The objectives of the BNL High-Temperature Hydrogen Combustion Research Program are discussed. The experimental facilities are described and two sets of preliminary experiments are presented. Chemical reaction time experiments have been performed to determine the length of time reactive mixtures of interest can be kept at temperature before reaction in the absence of ignition sources consumes the reactants. Preliminary observations are presented for temperatures in the range 588K--700K. Detonation experiments are described in which detonation cell width is measured as a measure of mixture sensitivity to detonation. Preliminary experiments are described which are being carried out to establish data reproducibility with previous measurements in the literature and to test out and refine experimental methods. Intensive studies of hydrogen combustion phenomena were carried out during the 1980s. Much of this effort was driven by issues related to nuclear reactor safety. The high-speed'' combustion phenomena of flame acceleration, deflagration-to-detonation transition, direct initiation of detonation, detonation propagation, limits of detonation in tubes and channels, transmission of detonations from confined to unconfined geometry and other related phenomena were studied using a variety of gaseous fuel-oxidant systems, including hydrogen-steam-air systems of interest in reactor safety studies. Several reviews are available which document this work [Lee, 1989; Berman, 1986].

Ciccarelli, G.; Ginsberg, T.; Boccio, J.; Curtiss, J.; Economos, C.; Jahelka, J.; Sato, K.

1992-01-01T23:59:59.000Z

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381

Progress in BNL High-Temperature Hydrogen Combustion Research Program  

DOE Green Energy (OSTI)

The objectives of the BNL High-Temperature Hydrogen Combustion Research Program are discussed. The experimental facilities are described and two sets of preliminary experiments are presented. Chemical reaction time experiments have been performed to determine the length of time reactive mixtures of interest can be kept at temperature before reaction in the absence of ignition sources consumes the reactants. Preliminary observations are presented for temperatures in the range 588K--700K. Detonation experiments are described in which detonation cell width is measured as a measure of mixture sensitivity to detonation. Preliminary experiments are described which are being carried out to establish data reproducibility with previous measurements in the literature and to test out and refine experimental methods. Intensive studies of hydrogen combustion phenomena were carried out during the 1980s. Much of this effort was driven by issues related to nuclear reactor safety. The ``high-speed`` combustion phenomena of flame acceleration, deflagration-to-detonation transition, direct initiation of detonation, detonation propagation, limits of detonation in tubes and channels, transmission of detonations from confined to unconfined geometry and other related phenomena were studied using a variety of gaseous fuel-oxidant systems, including hydrogen-steam-air systems of interest in reactor safety studies. Several reviews are available which document this work [Lee, 1989; Berman, 1986].

Ciccarelli, G.; Ginsberg, T.; Boccio, J.; Curtiss, J.; Economos, C.; Jahelka, J.; Sato, K.

1992-12-31T23:59:59.000Z

382

Stability of shock waves in high temperature plasmas  

Science Conference Proceedings (OSTI)

The Dyakov-Kontorovich criteria for spontaneous emission of acoustic waves behind shock fronts are investigated for high temperature aluminum and beryllium plasmas. To this end, the Dyakov and critical stability parameters are calculated from Rankine-Hugoniot curves using a more realistic equation of state (EOS). The cold and ionic contributions to the EOS are obtained via scaled binding energy and mean field theory, respectively. A screened hydrogenic model, including l-splitting, is used to calculate the bound electron contribution to the electronic EOS. The free electron EOS is obtained from Fermi-Dirac statistics. Predictions of the model for ionization curves and shock Hugoniot are found to be in excellent agreement with available experimental and theoretical data. It is observed that the electronic EOS has significant effect on the stability of the planar shock front. While the shock is stable for low temperatures and pressures, instability sets in as temperature rises. The basic reason is ionization of electronic shells and consequent increase in electronic specific heat. The temperatures and densities of the unstable region correspond to those where electronic shells get ionized. With the correct modeling of bound electrons, we find that shock instability for Al occurs at a compression ratio {approx}5.4, contrary to the value {approx}3 reported in the literature. Free electrons generated in the ionization process carry energy from the shock front, thereby giving rise to spontaneously emitted waves, which decay the shock front.

Das, Madhusmita [Department of Physics, Indian Institute of Technology, Bombay, Powai-400076 (India); Theoretical Physics Division, Bhabha Atomic Research Centre, Mumbai-400085 (India); Bhattacharya, Chandrani; Menon, S. V. G. [Theoretical Physics Division, Bhabha Atomic Research Centre, Mumbai-400085 (India)

2011-10-15T23:59:59.000Z

383

Advancing the Technology Base for High Temperature Hydrogen Membranes  

DOE Green Energy (OSTI)

High purity hydrogen is a critical component for at least two major industrial processes: 1) the refining of conventional steels and raw pig iron into low carbon steels and high purity iron used for high performance magnets in motors, generators, alternators, transformers, and etc.; and 2) refining metallurgical grade silicon to the high- purity, polycrystalline silicon used in fabricating single crystal silicon wafers for semiconductor manufacturing. In the process of producing low carbon iron products, CO and CO2 impurities prevent efficient removal of the carbon already in the raw iron. In the refining of metallurgical grade silicon, the presence of any impurity above the part-per- million level prevents the ultimate fabrication of the large scale single crystals that are essential to the semiconductor device. In a lesser magnitude role, high quality hydrogen is used in a variety of other processes, including specialty metals refining (e.g., iridium, osmium, palladium, platinum, and ruthenium) and R{ampersand}D in areas such as organic synthesis and development of certain types of fuel cells. In all of these applications, a high-temperature hydrogen membrane can provide a method for achieving a very high purity level of hydrogen in a manner that is more economical and/or more rugged than existing techniques.

Dye, Robert C.; Moss, Thomas S.

1997-12-31T23:59:59.000Z

384

Screening study on high temperature energy transport systems  

SciTech Connect

The purpose of the study described in this document is to identify the options for transporting thermal energy over long distances. The study deals specifically and exclusively with high temperature (> 400/sup 0/C(752/sup 0/F)) energy for industrial use. Energy transport is seen as a potential solution to: high unit cost of small coal and nuclear steam generators, and opposition to siting of coal or nuclear plants near populated areas. The study is of a preliminary nature but covers many options including steam, molten salts, organics, and chemical heat pipes. The development status and potential problems of these and other energy transport methods are discussed. Energy transport concepts are compared on a fundamental level based on physical properties and also are subjected to an economic study. The economic study indicated that the chemical heat pipe, under a specific set of circumstances, appeared to be the least expensive for distances greater than about 32 km (20 miles). However, if the temperature of the energy was lowered, the heat transfer salt (sodium nitrate/nitrite) system would apparently be a better economic choice for less than about 80 km (50 miles). None of the options studied appear to be more attractive than small coal-fired boilers when the transport distance is over about 64 km (40 miles). Several recommendations are made for refining the analysis.

Graves, R.L.

1980-10-01T23:59:59.000Z

385

High temperature metallic diffraction gratings and process of manufacturing same  

DOE Patents (OSTI)

This invention is comprised of a method of applying diffraction gratings or images directly to the surface of a substrate wherein the gratings or images are capable of withstanding high temperatures, pressures, humidity and other such conditions related to materials testing. The method includes coating the surface of the substrate with an uniform layer of metal which is then overlaid with a layer of photo-resist material. Next, after contacting the photo-resist material with a master image containing regions of opacity and transparency, electromagnetic radiation is directed through the master image to expose the photo-resist material such that a contact print of the master image is produced on the photo-resist material. Then, after removing the master image, the photo-resist material is developed so as to remove unhardened portions thereof and leave corresponding portions of the metal layer uncovered. Finally, after removing or etching the uncovered portions of the metal layer, the remaining photo-resist material is removed to produce a metallic diffraction grating or image of predetermined size and pattern on the surface of the substrate.

Deason, V.A.; Hsu, Karen M.; Miller, R.L.

1993-12-31T23:59:59.000Z

386

Polymer nanocomposites for high-temperature composite repair  

SciTech Connect

A novel repair agent for resin-injection repair of advanced high temperature composites was developed and characterized. The repair agent was based on bisphenol E cyanate ester (BECy) and reinforced with alumina nanoparticles. To ensure good dispersion and compatibility with the BECy matrix in nanocomposites, the alumina nanoparticles were functionalized with silanes. The BECy nanocomposites, containing bare and functionalized alumina nanoparticles, were prepared and evaluated for their thermal, mechanical, rheological, and viscoelastic properties. The monomer of BECy has an extremely low viscosity at ambient temperature, which is good for processability. The cured BECy polymer is a highly cross-linked network with excellent thermal mechanical properties, with a high glass transition temperature (T{sub g}) of 270 C and decomposition temperature above 350 C. The incorporation of alumina nanoparticles enhances the mechanical and rheological properties of the BECy nanocomposites. Additionally, the alumina nanoparticles are shown to catalyze the cure of BECy. Characterization of the nanocomposites included dynamic mechanical analysis, differential scanning calorimetry, thermogravimetric analysis, rheological and rheokinetic evaluation, and transmission electron microscopy. The experimental results show that the BECy nanocomposite is a good candidate as repair agent for resin-injection repair applications.

Sheng, Xia

2008-12-01T23:59:59.000Z

387

A High Temperature Liquid Plasma Model of the Sun  

E-Print Network (OSTI)

In this work, a liquid model of the Sun is presented wherein the entire solar mass is viewed as a high density/high energy plasma. This model challenges our current understanding of the densities associated with the internal layers of the Sun, advocating a relatively constant density, almost independent of radial position. The incompressible nature of liquids is advanced to prevent solar collapse from gravitational forces. The liquid plasma model of the Sun is a non-equilibrium approach, where nuclear reactions are free to occur throughout the solar mass. The primary means of addressing internal heat transfer are convection and conduction. As a result of the convective processes on the solar surface, the liquid model brings into question the established temperature of the solar photosphere by highlighting a violation of Kirchhoff's law of thermal emission. Along these lines, the model emphasizes that radiative emission is a surface phenomenon. Strong evidence is provided that the Sun is a high density/high energy liquid plasma. This evidence is based on our knowledge of Planckian thermal emission and condensed matter, including the existence of pressure ionization and liquid metallic hydrogen at high temperatures and pressures. The equations of magnetohydrodynamics are invoked as the proper vehicle for the understanding od stellar convection and structure. Prior to introducing the liquid plasma model, the historic and scientific justifications for the gaseous model of the Sun are reviewed and the gaseous equations of state are also discussed.

Pierre-Marie Robitaille

2004-10-04T23:59:59.000Z

388

Power efficiency for very high temperature solar thermal cavity receivers  

DOE Patents (OSTI)

This invention is an improved solar energy cavity receiver for exposing materials and components to high temperatures. The receiver includes a housing having an internal reflective surface defining a cavity and having an inlet for admitting solar radiation thereto. A photothermal absorber is positioned in the cavity to receive radiation from the inlet. A reflective baffle is positioned between the absorber and the inlet to severely restrict the re-radiation of energy through the inlet. The front surface of the baffle defines a narrow annulus with the internal reflective surface of the housing. The front surface of the baffle is contoured to reflect incoming radiation onto the internal surface of the housing, from which it is reflected through the annulus and onto the front surface of the absorber. The back surface of the baffle intercepts infrared radiation from the front of the absorber. With this arrangement, a high percentage of the solar power input is retained in the cavity; thus, high internal temperatures are attained.

McDougal, Allan R. (LaCanada-Flintridge, CA); Hale, Robert R. (Upland, CA)

1984-01-01T23:59:59.000Z

389

Novel Gas Sensors for High-Temperature Fossil Fuel Applications  

SciTech Connect

SRI International (SRI) is developing ceramic-based microsensors to detect exhaust gases such as NO, NO{sub 2}, and CO in advanced combustion and gasification systems under this DOE NETL-sponsored research project. The sensors detect the electrochemical activity of the exhaust gas species on catalytic electrodes attached to a solid state electrolyte and are designed to operate at the high temperatures, elevated pressures, and corrosive environments typical of large power generation exhausts. The sensors can be easily integrated into online monitoring systems for active emission control. The ultimate objective is to develop sensors for multiple gas detection in a single package, along with data acquisition and control software and hardware, so that the information can be used for closed-loop control in novel advanced power generation systems. This report details the Phase I Proof-of-Concept, research activities performed from October 2003 to March 2005. SRI's research work includes synthesis of catalytic materials, sensor design and fabrication, software development, and demonstration of pulse voltammetric analysis of NO, NO{sub 2}, and CO gases on catalytic electrodes.

Palitha Jayaweera; Francis Tanzella

2005-03-01T23:59:59.000Z

390

Parabolic refined invariants and Macdonald polynomials  

E-Print Network (OSTI)

A string theoretic derivation is given for the conjecture of Hausel, Letellier, and Rodriguez-Villegas on the cohomology of character varieties with marked points. Their formula is identified with a refined BPS expansion in the stable pair theory of a local root stack, generalizing previous work of the first two authors in collaboration with G. Pan. Haiman's geometric construction for Macdonald polynomials is shown to emerge naturally in this context via geometric engineering. In particular this yields a new conjectural relation between Macdonald polynomials and refined local orbifold curve counting invariants. The string theoretic approach also leads to a new spectral cover construction for parabolic Higgs bundles in terms of holomorphic symplectic orbifolds.

Wu-yen Chuang; Duiliu-Emanuel Diaconescu; Ron Donagi; Tony Pantev

2013-11-14T23:59:59.000Z

391

High temperature fracture and fatigue of ceramics. Final technical report, August 14, 1989--August 14, 1997  

Science Conference Proceedings (OSTI)

This program has supported basic research into the mechanisms and mechanics of failure of ceramic matrix composites at high temperature and under cyclic loads. Specialist experiments have been developed to assess mechanisms by in situ observations of specimens under load at temperature. Extensive models have been formulated based on observed mechanisms. A central theme has been the theory of bridged cracks, which appear as a universal mechanism in CMC failure. Fundamentals of bridged cracks have been elucidated, including length scales and important asymptotic limits. Both experiments and models have studied rate dependent problems, for example, cracking at high temperature in the presence of fiber creep in composites.

Cox, B.

1998-06-01T23:59:59.000Z

392

R&D Plan for the High Temperature Membrane Working Group  

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

Plan for the Plan for the High Temperature Membrane Working Group Introduction/Background The High Temperature Membrane Working Group was established to provide a forum for greater interaction in the effort to develop high temperature membranes for PEM fuel cells. The goal of this effort is particularly challenging and requires significant fundamental research and development. The Working Group meets twice a year (immediately before or after the Electrochemical Society meeting) and includes universities, national labs, small business and industry and is open to any interested individual/organization. The first meeting was in October, 2000. Working Group members are listed in Appendix A. This plan was developed to guide the R&D activities of the Working Group. The

393

An overview of the geology and secondary mineralogy of the high temperature  

Open Energy Info (EERE)

An overview of the geology and secondary mineralogy of the high temperature An overview of the geology and secondary mineralogy of the high temperature geothermal system in Dixie Valley, Nevada Jump to: navigation, search OpenEI Reference LibraryAdd to library Journal Article: An overview of the geology and secondary mineralogy of the high temperature geothermal system in Dixie Valley, Nevada Abstract Lithologic units encountered in the Dixie Valleygeothermalfield range from Triassic marine sediments toRecent basin-filling sediments. Structural features affectingthe location of the geothermal activity include Mesozoicthrusting. late Tertiary normal faulting andQuaternary to Recent normal faulting. The hydrothermalmineral suite is variable, due in part to rock-gasreactions. Author A. F. Waibel Published Journal Geothermal Resources Council Transactions, 1987

394

Practical reasons for investigating ion transport in high temperature insulating materials  

SciTech Connect

Practical problems encountered in a number of advanced technology applications, particularly those related to energy conversion, are discussed. Refractory ionic compounds which are abundant and of high melting point are listed, and technological problems are discussed in terms of specific materials problems. The argument is made that basic information concerning transport properties in refractory compounds is lacking to such an extent that it is difficult to design and assess advanced energy generation systems. Technology applications include (a) ceramic nuclear fuels for high temperature fission reactors, (b) high temperature gas turbine blades, (c) insulators in controlled thermonuclear reactors, and (d) magnetohydrodynamic generators. Some of the difficulties inherent in making transport property measurements at high temperatures are also listed.

Sonder, E.

1976-07-01T23:59:59.000Z

395

LARGE-SCALE HYDROGEN PRODUCTION FROM NUCLEAR ENERGY USING HIGH TEMPERATURE ELECTROLYSIS  

DOE Green Energy (OSTI)

Hydrogen can be produced from water splitting with relatively high efficiency using high-temperature electrolysis. This technology makes use of solid-oxide cells, running in the electrolysis mode to produce hydrogen from steam, while consuming electricity and high-temperature process heat. When coupled to an advanced high temperature nuclear reactor, the overall thermal-to-hydrogen efficiency for high-temperature electrolysis can be as high as 50%, which is about double the overall efficiency of conventional low-temperature electrolysis. Current large-scale hydrogen production is based almost exclusively on steam reforming of methane, a method that consumes a precious fossil fuel while emitting carbon dioxide to the atmosphere. Demand for hydrogen is increasing rapidly for refining of increasingly low-grade petroleum resources, such as the Athabasca oil sands and for ammonia-based fertilizer production. Large quantities of hydrogen are also required for carbon-efficient conversion of biomass to liquid fuels. With supplemental nuclear hydrogen, almost all of the carbon in the biomass can be converted to liquid fuels in a nearly carbon-neutral fashion. Ultimately, hydrogen may be employed as a direct transportation fuel in a “hydrogen economy.” The large quantity of hydrogen that would be required for this concept should be produced without consuming fossil fuels or emitting greenhouse gases. An overview of the high-temperature electrolysis technology will be presented, including basic theory, modeling, and experimental activities. Modeling activities include both computational fluid dynamics and large-scale systems analysis. We have also demonstrated high-temperature electrolysis in our laboratory at the 15 kW scale, achieving a hydrogen production rate in excess of 5500 L/hr.

James E. O'Brien

2010-08-01T23:59:59.000Z

396

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

397

Self-similar parabolic plasmonic beams Arthur R. Davoyan,1,2,  

E-Print Network (OSTI)

Self-similar parabolic plasmonic beams Arthur R. Davoyan,1,2, * Sergei K. Turitsyn,3 and Yuri S support stable self-similar plasmonic waves with a parabolic profile. Simplicity of a parabolic shape on availability of the basic waveforms with simple shapes, e.g., square top- flat, triangular, parabolic, and so

Turitsyn, Sergei K.

398

Fabrication and Characterization of Uranium-based High Temperature Reactor  

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

Fabrication and Characterization of Uranium-based High Temperature Reactor Fabrication and Characterization of Uranium-based High Temperature Reactor Fuel June 01, 2013 The Uranium Fuel Development Laboratory is a modern R&D scale lab for the fabrication and characterization of uranium-based high temperature reactor fuel. A laboratory-scale coater manufactures tri-isotropic (TRISO) coated fuel particles (CFPs), state-of-the-art materials property characterization is performed, and the CFPs are then pressed into fuel compacts for irradiation testing, all under a NQA-1 compliant Quality Assurance Program. After fuel kernel size and shape are measured by optical shadow imaging, the TRISO coatings are deposited via fluidized bed chemical vapor deposition in a 50-mm diameter conical chamber within the coating furnace. Computer control of temperature and gas composition ensures reproducibility

399

The Northwest Geysers High-Temperature Reservoir- Evidence For Active  

Open Energy Info (EERE)

Geysers High-Temperature Reservoir- Evidence For Active Geysers High-Temperature Reservoir- Evidence For Active Magmatic Degassing And Implications For The Origin Of The Geysers Geothermal Field Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: The Northwest Geysers High-Temperature Reservoir- Evidence For Active Magmatic Degassing And Implications For The Origin Of The Geysers Geothermal Field Details Activities (2) Areas (1) Regions (0) Abstract: Noble gas isotope abundances in steam from the Coldwater Creek field of the Northwest Geysers, California, show mixing between a nearly pure mid-ocean ridge (MOR) type magmatic gas with high 3He/4He and low radiogenic 40*Ar (R/Ra > 8.3 and 40*Ar/4He < 0.07), and a magmatic gas diluted with crustal gas (R/Ra 0.25). The

400

High-Temperature Downhole Tools | Open Energy Information  

Open Energy Info (EERE)

Tools Tools Jump to: navigation, search Contents 1 Geothermal Lab Call Projects for High-Temperature Downhole Tools 2 Geothermal ARRA Funded Projects for High-Temperature Downhole Tools Geothermal Lab Call Projects for High-Temperature Downhole Tools Loading map... {"format":"googlemaps3","type":"ROADMAP","types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"limit":200,"offset":0,"link":"all","sort":[""],"order":[],"headers":"show","mainlabel":"","intro":"","outro":"","searchlabel":"\u2026 further results","default":"","geoservice":"google","zoom":false,"width":"600px","height":"350px","centre":false,"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":"","icon":"","visitedicon":"","forceshow":true,"showtitle":true,"hidenamespace":false,"template":false,"title":"","label":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"locations":[{"text":"

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While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
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401

DOE Science Showcase - Understanding High-Temperature Superconductors |  

Office of Scientific and Technical Information (OSTI)

Understanding High-Temperature Superconductors Understanding High-Temperature Superconductors Credit: DOE Scientists have long worked to understand one of the great mysteries of modern physics - the origin and behavior of high-temperature superconductors (HTS) that are uniquely capable of transmitting electricity with zero loss when chilled to subzero temperatures. For decades there have been competing theories and misunderstandings of how HTS materials actually work and they have remained fundamentally puzzling to physicists. Solving this mystery has the potential to revolutionize the planet's energy infrastructure from generation to transmission and grid-scale storage. Recent technical breakthroughs in this quest are being discovered by DOE scientists and their collaborators. Read about HTS technology, basic

402

Potential uses for a high-temperature borehole gravimeter  

DOE Green Energy (OSTI)

It is possible to design a canister to cool a borehole gravimeter for use in geothermal and high-temperature (up to 350/sup 0/C) gas wells. Repeat surveys with such a gravimeter could (1) help estimate the extent of reservoir plugging in geothermal injection well after one year of operation and (2) detect compaction of a geothermal aquifer if the change in thickness of the aquifer exceeds 1 m. The instrument could be used together with conventional logging tools to evaluate radial dependence of density around a well, or to estimate gas-filled porosity around wells drilled with mud. A high-temperature borehole gravimeter could also be used to evaluate structure and stratigraphy around geothermal and high-temperature gas wells.

Hearst, J.R.; Kasameyer, P.W.; Owen, L.B.

1978-03-08T23:59:59.000Z

403

Single-photon single-ion interaction in free space configuration in front of a parabolic mirror  

E-Print Network (OSTI)

The efficient interaction between single photons and single matter objects in free space is of key importance for quantum technologies. An experimental setup for testing this possibility involves single two-level ion trapped at the focus of a parabolic metallic mirror. We study the conditions for the setup, under which the assumption about the free-space mode structure of the radiation field in the vicinity of the atom is justified. In our analysis we apply vectorial properties of light by including polarization degree of freedom. We look for possible changes in the spontaneous emission rate of the atom resulting from the presence of the parabolic boundary conditions.

Magdalena Stobi?ska; Robert Alicki

2009-05-25T23:59:59.000Z

404

High-Temperature-High-Volume Lifting | Open Energy Information  

Open Energy Info (EERE)

source source History View New Pages Recent Changes All Special Pages Semantic Search/Querying Get Involved Help Apps Datasets Community Login | Sign Up Search Page Edit History Facebook icon Twitter icon » High-Temperature-High-Volume Lifting Jump to: navigation, search Geothermal ARRA Funded Projects for High-Temperature-High-Volume Lifting Loading map... {"format":"googlemaps3","type":"ROADMAP","types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"limit":200,"offset":0,"link":"all","sort":[""],"order":[],"headers":"show","mainlabel":"","intro":"","outro":"","searchlabel":"\u2026

405

Vibration Combined High Temperature Cycle Tests for Capacitive MEMS Accelerometers  

E-Print Network (OSTI)

In this paper vibration combined high temperature cycle tests for packaged capacitive SOI-MEMS accelerometers are presented. The aim of these tests is to provide useful Design for Reliability information for MEMS designers. A high temperature test chamber and a chopper-stabilized read-out circuitry were designed and realized at BME - DED. Twenty thermal cycles of combined Temperature Cycle Test and Fatigue Vibration Test has been carried out on 5 samples. Statistical evaluation of the test results showed that degradation has started in 3 out of the 5 samples.

Szucs, Z; Hodossy, S; Rencz, M; Poppe, A

2008-01-01T23:59:59.000Z

406

Vibration Combined High Temperature Cycle Tests for Capacitive MEMS Accelerometers  

E-Print Network (OSTI)

In this paper vibration combined high temperature cycle tests for packaged capacitive SOI-MEMS accelerometers are presented. The aim of these tests is to provide useful Design for Reliability information for MEMS designers. A high temperature test chamber and a chopper-stabilized read-out circuitry were designed and realized at BME - DED. Twenty thermal cycles of combined Temperature Cycle Test and Fatigue Vibration Test has been carried out on 5 samples. Statistical evaluation of the test results showed that degradation has started in 3 out of the 5 samples.

Z. Szucs; G. Nagy; S. Hodossy; M. Rencz; A. Poppe

2008-01-07T23:59:59.000Z

407

Logging technology for high-temperature geothermal boreholes  

DOE Green Energy (OSTI)

Research in materials, equipment, and instrument development was required in the Hot Dry Rock Energy Extraction Demonstration at Fenton Hill located in northern New Mexico. Results of this extensive development advanced the logging technology in geothermal boreholes to present state-of-the art. The new Phase II Energy Extraction System at the Fenton Hill Test Site will consist of two wellbores drilled to a depth of about 4570 m (15,000 ft) and then connected by a series of hydraulic-induced fractures. The first borehole (EE-2) was completed in May of 1980 at a depth of 4633 m (15,200 ft) of which approximately 3960 m (13,000 ft) is in Precambrian granitic rock. Starting at a depth of approximately 2930 m (9600 ft), the borehole was inclined up to 35/sup 0/ from vertical. Bottom-hole temperature in EE-2 is 320/sup 0/C. The EE-3 borehole was then drilled to a depth of 4236 m (13,900 ft). Its inclined part is positioned directly over the EE-2 wellbore with a vertical separation of about 450 m (1500 ft) between them. Many of the geophysical measurements needed to develop the hot dry rock concept are unique. Most of the routine instruments used in petroleum drilling fail in the hot and abrasive environment. New equipment developed includes not only the downhole sonde that houses the transducer and associated line driving electronics, but modifications also were needed on the entire data retrieval systems and associated data analysis technology. Successful performance of wellbore surveys in the EE-2 and EE-3 boreholes depended upon the capacity of the sensors, instrument sonde, cablehead, and armored logging cable to work in this severe environment. The major areas of materials development for surveying the boreholes in the high-temperature environment were on elastomeric seals, electrical insulation for logging cables, downhole sensors, and associated downhole electronic and electro-mechanical components.

Dennis, B.R.

1984-05-01T23:59:59.000Z

408

NOvel Refractory Materials for High Alkali, High Temperature Environments  

SciTech Connect

Refractory materials can be limited in their application by many factors including chemical reactions between the service environment and the refractory material, mechanical degradation of the refractory material by the service environment, temperature limitations on the use of a particular refractory material, and the inability to install or repair the refractory material in a cost effective manner or while the vessel was in service. The objective of this project was to address the need for new innovative refractory compositions by developing a family of novel MgO-Al2O3 spinel or other similar magnesia/alumina containing unshaped refractory composition (castables, gunnables, shotcretes, etc) utilizing new aggregate materials, bond systems, protective coatings, and phase formation techniques (in-situ phase formation, altered conversion temperatures, accelerated reactions, etc). This family of refractory compositions would then be tailored for use in high-temperature, highalkaline industrial environments like those found in the aluminum, chemical, forest products, glass, and steel industries. A research team was formed to carry out the proposed work led by Oak Ridge National Laboratory (ORNL) and was comprised of the academic institution Missouri University of Science and Technology (MS&T), and the industrial company MINTEQ International, Inc. (MINTEQ), along with representatives from the aluminum, chemical, glass, and forest products industries. The two goals of this project were to produce novel refractory compositions which will allow for improved energy efficiency and to develop new refractory application techniques which would improve the speed of installation. Also methods of hot installation were sought which would allow for hot repairs and on-line maintenance leading to reduced process downtimes and eliminating the need to cool and reheat process vessels.

Hemrick, J.G.; Griffin, R. (MINTEQ International, Inc.)

2011-08-30T23:59:59.000Z

409

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.

410

NREL: TroughNet - Parabolic Trough Thermal Energy Storage Technology  

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

Thermal Energy Storage Technology One advantage of parabolic trough power plants is their potential for storing solar thermal energy to use during non-solar periods and to dispatch...

411

Shock stability analysis for Parabolized Navier-Stokes equations  

Science Conference Proceedings (OSTI)

Parabolized Navier-Stokes (PNS) techniques have been receiving increasing attention as an effective method for treating two and three dimensional high-speed gas flows. Since the method involves marching in a ''time like'' coordinate the problem size ...

Douglas D. Cline; Graham F. Carey

1988-12-01T23:59:59.000Z

412

Parabolic Equations and Markov Processes Over p-adic Fields  

E-Print Network (OSTI)

We construct and study a fundamental solution of Cauchy's problem for p-adic parabolic equations of a certain the type. The fundamental solution is the transition density of a p-adic Markov process.

W. A. Zuniga-Galindo

2006-12-11T23:59:59.000Z

413

Application of the Piecewise Parabolic Method (PPM) to Meteorological Modeling  

Science Conference Proceedings (OSTI)

The Piecewise Parabolic Method (PPM), a numerical technique developed in astrophysics for modeling fluid flows with strong shocks and discontinuities is adapted for treating sharp gradients in small-scale meteorological flows. PPM differs ...

Richard L. Carpenter Jr.; Kelvin K. Droegemeier; Paul R. Woodward; Carl E. Hane

1990-03-01T23:59:59.000Z

414

CLASSICAL TWO-PARABOLIC T-SCHOTTKY GROUPS  

E-Print Network (OSTI)

A T-Schottky group is a discrete group of Möbius transformations whose generators identify pairs of possibly-tangent Jordan curves on the complex sphere ? ?. If the curves are Euclidean circles, then the group is termed classical T-Schottky. We describe the boundary of the space of classical T-Schottky groups affording two parabolic generators within the larger parameter space of all-Schottky groups with two parabolic generators. This boundary is surprisingly different from that of the larger space. It is analytic, while the boundary of the larger space appears to be fractal. Approaching the boundary of the smaller space does not correspond to pinching; circles necessarily become tangent, but extra parabolics need not develop. As an application, we construct an explicit one parameter family of two parabolic generator non-classical T-Schottky groups.

Jane Gilman; Peter Waterman

2006-01-01T23:59:59.000Z

415

Guidelines for reporting parabolic trough solar electric system performance  

DOE Green Energy (OSTI)

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

416

High-temperature industrial process heat: technology assessment and introduction rationale  

SciTech Connect

Three specific topics of interest to DOE are addressed: to establish the significance and identify the role of high-temperature process heat in the nation's energy economy; to identify the role of solar thermal power in these high-temperature industrial applications in terms of possible markets and economic potential; and to recommend programmatic approaches for these solar thermal high-temperature process heat activities, including proposed content for initial Request for Proposals (RFPs) to accomplish such activities. The scope of the work required to accomplish these three purposes included the following: review of US industrial energy requirements, survey of current DOE low-temperature Agricultural and Industrial Process Heat Program, examination of high-temperature solar thermal electric systems already developed or under development by DOE and industry, and coordination with the high-energy user segments of industry (i.e., cement, chemical and petroleum) to find additional markets for some or all of the systems or components being developed in the DOE solar thermal electric program. Statistical data are presented identifying energy allocations to process heat and defining DOE's involvement. Three current fossil fuel process heat system examples are provided and the corresponding solar potential is identified.

1978-03-03T23:59:59.000Z

417

High-temperature industrial process heat: technology assessment and introduction rationale  

DOE Green Energy (OSTI)

Three specific topics of interest to DOE are addressed: to establish the significance and identify the role of high-temperature process heat in the nation's energy economy; to identify the role of solar thermal power in these high-temperature industrial applications in terms of possible markets and economic potential; and to recommend programmatic approaches for these solar thermal high-temperature process heat activities, including proposed content for initial Request for Proposals (RFPs) to accomplish such activities. The scope of the work required to accomplish these three purposes included the following: review of US industrial energy requirements, survey of current DOE low-temperature Agricultural and Industrial Process Heat Program, examination of high-temperature solar thermal electric systems already developed or under development by DOE and industry, and coordination with the high-energy user segments of industry (i.e., cement, chemical and petroleum) to find additional markets for some or all of the systems or components being developed in the DOE solar thermal electric program. Statistical data are presented identifying energy allocations to process heat and defining DOE's involvement. Three current fossil fuel process heat system examples are provided and the corresponding solar potential is identified.

Not Available

1978-03-03T23:59:59.000Z

418

Factors Influencing the Stability of Nickel-Base High-Temperature ...  

Science Conference Proceedings (OSTI)

parabolic relationship between hardener-content a d stress-rupture life found in earlier alloy development studies 5 lends support to. (f this hypothesis. Whilst it ...

419

Parabolic sturmians approach to the three-body continuum Coulomb problem  

SciTech Connect

The three-body continuum Coulomb problem is treated in terms of the generalized parabolic coordinates. Approximate solutions are expressed in the form of a Lippmann-Schwinger-type equation, where the Green's function includes the leading term of the kinetic energy and the total potential energy, whereas the potential contains the non-orthogonal part of the kinetic energy operator. As a test of this approach, the integral equation for the (e{sup -}, e{sup -}, He{sup ++}) system has been solved numerically by using the parabolic Sturmian basis representation of the (approximate) potential. Convergence of the expansion coefficients of the solution has been obtained as the basis set used to describe the potential is enlarged.

Zaytsev, S. A., E-mail: zaytsev@fizika.khstu.ru [Pacific National University (Russian Federation); Popov, Yu. V. [Moscow State University, Nuclear Physics Institute (Russian Federation)] [Moscow State University, Nuclear Physics Institute (Russian Federation); Piraux, B. [Universite catholique de Louvain, Institute of Condensed Matter and Nanosciences (Belgium)] [Universite catholique de Louvain, Institute of Condensed Matter and Nanosciences (Belgium)

2013-03-15T23:59:59.000Z

420

Gas Turbine/Solar Parabolic Trough Hybrid Design Using Molten Salt Heat Transfer Fluid: Preprint  

DOE Green Energy (OSTI)

Parabolic trough power plants can provide reliable power by incorporating either thermal energy storage (TES) or backup heat from fossil fuels. This paper describes a gas turbine / parabolic trough hybrid design that combines a solar contribution greater than 50% with gas heat rates that rival those of natural gas combined-cycle plants. Previous work illustrated benefits of integrating gas turbines with conventional oil heat-transfer-fluid (HTF) troughs running at 390?C. This work extends that analysis to examine the integration of gas turbines with salt-HTF troughs running at 450 degrees C and including TES. Using gas turbine waste heat to supplement the TES system provides greater operating flexibility while enhancing the efficiency of gas utilization. The analysis indicates that the hybrid plant design produces solar-derived electricity and gas-derived electricity at lower cost than either system operating alone.

Turchi, C. S.; Ma, Z.

2011-08-01T23:59:59.000Z

Note: This page contains sample records for the topic "include high-temperature parabolic" 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

Parabolic Whittaker Functions and Topological Field Theories I  

E-Print Network (OSTI)

First, we define a generalization of the standard quantum Toda chain inspired by a construction of quantum cohomology of partial flags spaces GL(\\ell+1)/P, P a parabolic subgroup. Common eigenfunctions of the parabolic quantum Toda chains are generalized Whittaker functions given by matrix elements of infinite-dimensional representations of gl(\\ell+1). For maximal parabolic subgroups (i.e. for P such that GL(\\ell+1)/P=\\mathbb{P}^{\\ell}) we construct two different representations of the corresponding parabolic Whittaker functions as correlation functions in topological quantum field theories on a two-dimensional disk. In one case the parabolic Whittaker function is given by a correlation function in a type A equivariant topological sigma model with the target space \\mathbb{P}^{\\ell}. In the other case the same Whittaker function appears as a correlation function in a type B equivariant topological Landau-Ginzburg model related with the type A model by mirror symmetry. This note is a continuation of our project of establishing a relation between two-dimensional topological field theories (and more generally topological string theories) and Archimedean (\\infty-adic) geometry. From this perspective the existence of two, mirror dual, topological field theory representations of the parabolic Whittaker functions provide a quantum field theory realization of the local Archimedean Langlands duality for Whittaker functions. The established relation between the Archimedean Langlands duality and mirror symmetry in two-dimensional topological quantum field theories should be considered as a main result of this note.

Anton Gerasimov; Dimitri Lebedev; Sergey Oblezin

2010-02-12T23:59:59.000Z

422

Final Scientific Report - "Novel Steels for High Temperature Carburizing"  

Science Conference Proceedings (OSTI)

This program was undertaken to develop a microalloy-modified grade of standard carburizing steel that can successfully exploit the high temperature carburizing capabilities of current commercial low pressure (i.e. 'vacuum') carburizing systems. Such steels can lower the amount of energy required for commercial carburizing operations by reducing the time required for deep-case carburizing operations. The specific technical objective of the work was to demonstrate a carburizing steel composition capable of maintaining a prior austenite grain size no larger than ASTM grain size number 5 after exposure to simulated carburizing conditions of 1050 C for 8 hr. Such thermal exposure should be adequate for producing carburized case depths up to about 2 mm. Such carburizing steels are expected to be attractive for use across a wide range of industries, including the petroleum, chemical, forest products, automotive, mining and industrial equipment industries. They have potential for reducing energy usage during low pressure carburizing by more than 25%, as well as reducing cycle times and process costs substantially. They also have potential for reducing greenhouse gas emissions from existing low pressure carburizing furnaces by more than 25%. High temperature carburizing can be done in most modern low pressure carburizing systems with no additional capital investment. Accordingly, implementing this technology on carburizing furnaces will provide a return on investment significantly greater than 10%. If disseminated throughout the domestic carburizing community, the technology has potential for saving on the order of 23 to 34 trillion BTU/year in industrial energy usage. Under the program, two compositions of microalloyed, coarsening-resistant low alloy carburizing steels were developed, produced and evaluated. After vacuum annealing at 1050oC for 8 hrs and high pressure gas quenching, both steels exhibited a prior austenite ASTM grain size number of 5.0 or finer. For comparison, a control alloy of similar composition but without the microalloy additions exhibited a duplex prior austenite grain size with grains ranging from ASTM grain size 3 down to ASTM grain size 1 after similar processing and thermal exposure. These results confirm the potential for using microalloy additions of Ti, B, Nb, Al, rare earths and/or N for austenite grain size control in Cr-Mo (i.e. 4000-series) low alloy carburizing steels. They also demonstrate that these microalloy additions will not compromise the processability of the steel; all three materials produced under the program could be hot worked readily using normal steel processing protocols. To fully realize the technical and commercial potential of these steels, there is a need to continue development work using larger-scale heats. These larger-scale heats are needed to provide adequate material for fatigue testing of quenched and tempered alloys, to conduct more complete investigations of potential alloy chemistries and to provide additional material for processing studies. It will also be beneficial to carefully review intellectual property issues associated with this family of steels, since existing Japanese patent literature suggests that significant microstructural and/or process characterization work may be needed on new materials to confirm that these materials fall outside existing patent claims.

McKimpson, Marvin G.; Liu, Tianjun; Maniruzzaman, Md

2012-07-27T23:59:59.000Z

423

High Temperature coatings based on {beta}-NiAI  

Science Conference Proceedings (OSTI)

High temperature alloys are reviewed, focusing on current superalloys and their coatings. The synthesis, characerization, and oxidation performance of a NiAl–TiB{sub 2} composite are explained. A novel coating process for Mo–Ni–Al alloys for improved oxidation performance is examined. The cyclic oxidation performance of coated and uncoated Mo–Ni–Al alloys is discussed.

Severs, Kevin

2012-07-10T23:59:59.000Z

424

Preparation of high temperature gas-cooled reactor fuel element  

DOE Patents (OSTI)

This invention relates to a method for the preparation of high temperature gas-cooled reactor (HTGR) fuel elements wherein uncarbonized fuel rods are inserted in appropriate channels of an HTGR fuel element block and the entire block is inserted in an autoclave for in situ carbonization under high pressure. The method is particularly applicable to remote handling techniques.

Bradley, Ronnie A. (Oak Ridge, TN); Sease, John D. (Knoxville, TN)

1976-01-01T23:59:59.000Z

425

Free energy of Lorentz-violating QED at high temperature  

E-Print Network (OSTI)

In this paper we study the one- and two-loop contribution to the free energy in QED with the Lorentz symmetry breaking introduced via constant CPT-even Lorentz-breaking parameters at the high temperature limit. We find the impact of the Lorentz-violating term for the free energy and carry out a numerical estimation for the Lorentz-breaking parameter.

M. Gomes; T. Mariz; J. R. Nascimento; A. Yu. Petrov; A. F. Santos; A. J. da Silva

2009-10-23T23:59:59.000Z

426

AC Losses in the New High-Temperature Superconductors  

Science Conference Proceedings (OSTI)

This report addresses the properties of high-temperature ceramic oxide superconductors in low magnetic fields. It discusses ac losses in the superconducting and normal states, the influence of anisotropy, and a database for monitoring advances in superconductivity. The ac losses of the oxide superconductors were found to be excessive.

1989-03-17T23:59:59.000Z

427

Electronically conductive ceramics for high temperature oxidizing environments  

DOE Patents (OSTI)

This invention pertains to a high temperature, ceramic composition having electronic conductivity as measured by resistivity below about 500 ohm-cm, chemical stability particularly with respect to cathode conditions in a molten carbonate fuel cell, and composed of an alkali metal, transition metal oxide containing a dopant metal in the crystalline structure to replace a portion of the alkali metal or transition metal.

Kucera, G.H.; Smith, J.L.; Sim, J.W.

1983-11-10T23:59:59.000Z

428

High-temperature seal development for the share receiver  

DOE Green Energy (OSTI)

The development and experimental demonstration of a high-temperature seal for the SHARE ceramic dome cavity receiver is reported. The mechanical contact seal which was tested on one-foot diameter silicon carbide ceramic dome hardware at pressure differentials to four atmospheres and dome temperatures to 2200/sup 0/F (1200/sup 0/C) showed negligible leakage at expected receiver operating conditions.

Jarvinen, P. O.

1979-01-01T23:59:59.000Z

429

NUCLEAR RESONANT SCATTERING AT HIGH PRESSURE AND HIGH TEMPERATURE  

E-Print Network (OSTI)

NUCLEAR RESONANT SCATTERING AT HIGH PRESSURE AND HIGH TEMPERATURE JIYONG ZHAOa,Ã? , WOLFGANG, The University of Chicago, Chicago, IL 60637, USA We introduce the combination of nuclear resonant inelastic X the thermal radiation spectra fitted to the Planck radiation function up to 1700 K. Nuclear resonant

Shen, Guoyin

430

Solargenix Energy Advanced Parabolic Trough Development  

SciTech Connect

The Solargenix Advanced Trough Development Project was initiated in the Year 2000 with the support of the DOE CSP Program and, more recently, with the added support of the Nevada Southwest Energy Partnership. Parabolic trough plants are the most mature solar power technology, but no large-scale plants have been built in over a decade. Given this lengthy lull in deployment, our first Project objective was development of improved trough technology for near-term deployment, closely patterned after the best of the prior-generation troughs. The second objective is to develop further improvements in next-generation trough technology that will lead to even larger reductions in the cost of the delivered energy. To date, this Project has successfully developed an advanced trough, which is being deployed on a 1-MW plant in Arizona and will soon be deployed in a 64-MW plant in Nevada. This advanced trough offers a 10% increase in performance and over an 20% decrease in cost, relative to prior-generation troughs.

Gee, R. C.; Hale, M. J.

2005-11-01T23:59:59.000Z

431

Parabolic Trough Receiver Heat Loss Testing (Poster)  

DOE Green Energy (OSTI)

Parabolic trough receivers, or heat collection elements (HCEs), absorb sunlight focused by the mirrors and transfer that thermal energy to a fluid flowing within them. Thje absorbing tube of these receivers typically operates around 400 C (752 F). HCE manufacturers prevent thermal loss from the absorbing tube to the environment by using sputtered selective Cermet coatings on the absorber and by surrounding the absorber with a glass-enclosed evacuated annulus. This work quantifies the heat loss of the Solel UVAC2 and Schott PTR70 HCEs. At 400 C, the HCEs perform similarly, losing about 400 W/m of HCE length. To put this in perspective, the incident beam radiation on a 5 m mirror aperture is about 4500 W/m, with about 75% of that energy ({approx} 3400 W/m) reaching the absorber surface. Of the 3400 W/m on the absorber, about 3000 W/m is absorbed into the working fluid while 400 W/m is lost to the environment.

Price, H.; Netter, J.; Bingham, C.; Kutscher, C.; Burkholder, F.; Brandemuehl, M.

2007-03-01T23:59:59.000Z

432

Reactor User Interface Technology Development Roadmaps for a High Temperature Gas-Cooled Reactor Outlet Temperature of 750 degrees C  

DOE Green Energy (OSTI)

This report evaluates the technology readiness of the interface components that are required to transfer high-temperature heat from a High Temperature Gas-Cooled Reactor (HTGR) to selected industrial applications. This report assumes that the HTGR operates at a reactor outlet temperature of 750°C and provides electricity and/or process heat at 700°C to conventional process applications, including the production of hydrogen.

Ian Mckirdy

2010-12-01T23:59:59.000Z

433

High Temperature Superconductivity -- A Joint Feasibility Study for a Power Application with High-Temperature Superconducting Cable by Peco Energy  

Science Conference Proceedings (OSTI)

Practical realization of high temperature superconductivity (HTS) technology is within the electric power industry's reach. This report documents a feasibility study co-sponsored by PECO Energy Company (PECO) to assess a real-world underground transmission application of this technology.

1998-11-17T23:59:59.000Z

434

High Temperature Superconductivity -- A Joint Feasibility Study for a Power Application with High-Temperature Superconducting Cable by South Carolina  

Science Conference Proceedings (OSTI)

Practical realization of high temperature superconductivity (HTS) technology is within the reach of the electric power industry. This report documents a feasibility study co-sponsored by South Carolina Electric and Gas Company (SCE&G) to assess a real-world underground transmission application of this technology.

1998-11-17T23:59:59.000Z

435

Current and Future Economics of Parabolic Trough Technology  

Science Conference Proceedings (OSTI)

Solar energy is the largest energy resource on the planet. Unfortunately, it is largely untapped at present, in part because sunlight is a very diffuse energy source. Concentrating solar power (CSP) systems use low cost reflectors to concentrate the sun's energy to allow it to be used more effectively. Concentrating solar power systems are also well suited for large solar power plants that can be connected into the existing utility infrastructure. These two facts mean that CSP systems can be used to make a meaningful difference in energy supply in a relatively short period. CSP plants are best suited for the arid climates in the Southwestern United States, Northern Mexico, and many desert regions around the globe. A recent Western Governors' Association siting study [1] found that the solar potential in the U.S. Southwest is at least 4 times the total U.S. electric demand even after eliminating urban areas, environmentally sensitive areas, and all regions with a ground slope greater than 1%.While it is currently not practical to power the whole county from the desert southwest, only a small portion of this area is needed to make a substantial contribution to future U.S. electric needs. Many of the best sites are near existing high-voltage transmission lines and close to major power load centers in the Southwest (Los Angeles, Las Vegas, and Phoenix). In addition, the power provided by CSP technologies has strong coincidence with peak electric demand, especially in the Southwest where peak demand corresponds in large part to air conditioning loads. Parabolic troughs currently represent the most cost-effective CSP technology for developing large utility-scale solar electric power systems. These systems are also one of the most mature solar technologies, with commercial utility-scale plants that have been operating for over 20 years. In addition, substantial improvements have been made to the technology in recent years including improved efficiency and the addition of thermal energy storage. The main issue for parabolic trough technology is that the cost of electricity is still higher than the cost of electricity from conventional natural gas-fired power plants. Although higher natural gas prices are helping to substantially reduce the difference between the cost of electricity from solar and natural gas plants, in the near-term increased incentives such as the 30% Investment Tax Credit (ITC) are needed to make CSP technology approach competitiveness with natural gas power on a financial basis. In the longer term, additional reductions in the cost of the technology will be necessary. This paper looks at the near-term potential for parabolic trough technology to compete with conventional fossil power resources in the firm, intermediate load power market and at the longer term potential to compete in the baseload power market. The paper will consider the potential impact of a reduced carbon emissions future.

Price, H.; Mehos, M.; Kutscher, C.; Blair, N.

2007-01-01T23:59:59.000Z

436

Deterministic Modeling of the High Temperature Test Reactor  

SciTech Connect

Idaho National Laboratory (INL) is tasked with the development of reactor physics analysis capability of the Next Generation Nuclear Power (NGNP) project. In order to examine INL’s current prismatic reactor deterministic analysis tools, the project is conducting a benchmark exercise based on modeling the High Temperature Test Reactor (HTTR). This exercise entails the development of a model for the initial criticality, a 19 column thin annular core, and the fully loaded core critical condition with 30 columns. Special emphasis is devoted to the annular core modeling, which shares more characteristics with the NGNP base design. The DRAGON code is used in this study because it offers significant ease and versatility in modeling prismatic designs. Despite some geometric limitations, the code performs quite well compared to other lattice physics codes. DRAGON can generate transport solutions via collision probability (CP), method of characteristics (MOC), and discrete ordinates (Sn). A fine group cross section library based on the SHEM 281 energy structure is used in the DRAGON calculations. HEXPEDITE is the hexagonal z full core solver used in this study and is based on the Green’s Function solution of the transverse integrated equations. In addition, two Monte Carlo (MC) based codes, MCNP5 and PSG2/SERPENT, provide benchmarking capability for the DRAGON and the nodal diffusion solver codes. The results from this study show a consistent bias of 2–3% for the core multiplication factor. This systematic error has also been observed in other HTTR benchmark efforts and is well documented in the literature. The ENDF/B VII graphite and U235 cross sections appear to be the main source of the error. The isothermal temperature coefficients calculated with the fully loaded core configuration agree well with other benchmark participants but are 40% higher than the experimental values. This discrepancy with the measurement stems from the fact that during the experiments the control rods were adjusted to maintain criticality, whereas in the model, the rod positions were fixed. In addition, this work includes a brief study of a cross section generation approach that seeks to decouple the domain in order to account for neighbor effects. This spectral interpenetration is a dominant effect in annular HTR physics. This analysis methodology should be further explored in order to reduce the error that is systematically propagated in the traditional generation of cross sections.

Ortensi, J.; Cogliati, J. J.; Pope, M. A.; Ferrer, R. M.; Ougouag, A. M.

2010-06-01T23:59:59.000Z

437

Application of Gamma code coupled with turbomachinery models for high temperature gas-cooled reactors  

DOE Green Energy (OSTI)

The very high-temperature gas-cooled reactor (VHTR) is envisioned as a single- or dual-purpose reactor for electricity and hydrogen generation. The concept has average coolant temperatures above 9000C and operational fuel temperatures above 12500C. The concept provides the potential for increased energy conversion efficiency and for high-temperature process heat application in addition to power generation. While all the High Temperature Gas Cooled Reactor (HTGR) concepts have sufficiently high temperature to support process heat applications, such as coal gasification, desalination or cogenerative processes, the VHTR’s higher temperatures allow broader applications, including thermochemical hydrogen production. However, the very high temperatures of this reactor concept can be detrimental to safety if a loss-ofcoolant accident (LOCA) occurs. Following the loss of coolant through the break and coolant depressurization, air will enter the core through the break by molecular diffusion and ultimately by natural convection, leading to oxidation of the in-core graphite structure and fuel. The oxidation will accelerate heatup of the reactor core and the release of a toxic gas, CO, and fission products. Thus, without any effective countermeasures, a pipe break may lead to significant fuel damage and fission product release. Prior to the start of this Korean/United States collaboration, no computer codes were available that had been sufficiently developed and validated to reliably simulate a LOCA in the VHTR. Therefore, we have worked for the past three years on developing and validating advanced computational methods for simulating LOCAs in a VHTR. GAMMA code is being developed to implement turbomachinery models in the power conversion unit (PCU) and ultimately models associated with the hydrogen plant. Some preliminary results will be described in this paper.

Chang Oh

2008-02-01T23:59:59.000Z

438

Does the fully parabolic quasilinear 1D Keller-Segel system enjoy long-time asymptotics analogous to its parabolic-elliptic simplification?  

E-Print Network (OSTI)

We show that the one-dimensional fully parabolic Keller-Segel system with nonlinear diffusion possesses global-in-time solutions, provided the nonlinear diffusion is equal to (1+u)^{-\\alpha}, for \\alpha parabolic-elliptic case to the fully parabolic one. However, in the parabolic-elliptic case the above mentioned integrability condition on nonlinear diffusion sharply distinguishes between global existence and blowup cases. We are unable to recover the entire global existence counterpart of this result in a fully parabolic case.

Jan Burczak; Tomasz Cie?lak; Cristian Morales-Rodrigo

2011-11-07T23:59:59.000Z

439

Safeguards Guidance for Prismatic Fueled High Temperature Gas Reactors (HTGR)  

National Nuclear Security Administration (NNSA)

5) 5) August 2012 Guidance for High Temperature Gas Reactors (HTGRs) with Prismatic Fuel INL/CON-12-26130 Revision 0 Safeguards-by-Design: Guidance for High Temperature Gas Reactors (HTGRs) With Prismatic Fuel Philip Casey Durst (INL Consultant) August 2012 DISCLAIMER This information was prepared as an account of work sponsored by an agency of the U.S. Government. Neither the U.S. Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness, of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. References herein to any specific commercial product,

440

Two Phase Transitions Make a High-Temperature Superconductor  

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

Two Phase Transitions Make a High-Temperature Superconductor Print Two Phase Transitions Make a High-Temperature Superconductor Print Superconductivity-conceptually remarkable and practically revolutionary-is a quantum phenomenon in which bound electron pairs flow through a material in perfect synchrony, without friction. Conventional superconducting materials reach this state via a single thermal phase transition at a critical temperature (Tc). It was generally believed that such a picture also applied to the copper oxide (cuprate) superconductors-first discovered 25 years ago and the current record holders for highest Tc. However, three groups of researchers who performed measurements on the same cuprate material recently joined forces to prove that this view is inaccurate. Their work showed that another phase transition actually exists at a higher temperature in the cuprate phase diagram, below which electrons, instead of pairing up, organize themselves in a drastically different way.

Note: This page contains sample records for the topic "include high-temperature parabolic" 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

NETL: Mercury Emissions Control Technologies - Enhanced High Temperature  

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

Enhanced High Temperature Mercury Oxidation and Enhanced High Temperature Mercury Oxidation and In-Situ Active Carbon Generation for Low Cost Mercury Capture Mercury oxidation phenomenon and the studies of this phenomenon have generally focused on lower temperatures, typically below 650°F. This has been based on the mercury vapor equilibrium speciation curve. The baseline extents of mercury oxidation as reported in the ICR dataset and observed during subsequent tests has shown a tremendous amount of scatter. The objective of this project is to examine, establish and demonstrate the effect of higher temperature kinetics on mercury oxidation rates. Further, it is the objective of this project to demonstrate how the inherent mercury oxidation kinetics can be influenced to dramatically increase the mercury oxidation.

442

Two Phase Transitions Make a High-Temperature Superconductor  

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

Two Phase Transitions Make a High-Temperature Superconductor Print Two Phase Transitions Make a High-Temperature Superconductor Print Superconductivity-conceptually remarkable and practically revolutionary-is a quantum phenomenon in which bound electron pairs flow through a material in perfect synchrony, without friction. Conventional superconducting materials reach this state via a single thermal phase transition at a critical temperature (Tc). It was generally believed that such a picture also applied to the copper oxide (cuprate) superconductors-first discovered 25 years ago and the current record holders for highest Tc. However, three groups of researchers who performed measurements on the same cuprate material recently joined forces to prove that this view is inaccurate. Their work showed that another phase transition actually exists at a higher temperature in the cuprate phase diagram, below which electrons, instead of pairing up, organize themselves in a drastically different way.

443

Two Phase Transitions Make a High-Temperature Superconductor  

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

Two Phase Transitions Make a High-Temperature Superconductor Print Two Phase Transitions Make a High-Temperature Superconductor Print Superconductivity-conceptually remarkable and practically revolutionary-is a quantum phenomenon in which bound electron pairs flow through a material in perfect synchrony, without friction. Conventional superconducting materials reach this state via a single thermal phase transition at a critical temperature (Tc). It was generally believed that such a picture also applied to the copper oxide (cuprate) superconductors-first discovered 25 years ago and the current record holders for highest Tc. However, three groups of researchers who performed measurements on the same cuprate material recently joined forces to prove that this view is inaccurate. Their work showed that another phase transition actually exists at a higher temperature in the cuprate phase diagram, below which electrons, instead of pairing up, organize themselves in a drastically different way.

444

Two Phase Transitions Make a High-Temperature Superconductor  

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

Two Phase Transitions Make a High-Temperature Superconductor Print Two Phase Transitions Make a High-Temperature Superconductor Print Superconductivity-conceptually remarkable and practically revolutionary-is a quantum phenomenon in which bound electron pairs flow through a material in perfect synchrony, without friction. Conventional superconducting materials reach this state via a single thermal phase transition at a critical temperature (Tc). It was generally believed that such a picture also applied to the copper oxide (cuprate) superconductors-first discovered 25 years ago and the current record holders for highest Tc. However, three groups of researchers who performed measurements on the same cuprate material recently joined forces to prove that this view is inaccurate. Their work showed that another phase transition actually exists at a higher temperature in the cuprate phase diagram, below which electrons, instead of pairing up, organize themselves in a drastically different way.

445

High temperature solar thermal technology: The North Africa Market  

DOE Green Energy (OSTI)

High temperature solar thermal (HTST) technology offers an attractive option for both industrialized and non-industrialized countries to generate electricity and industrial process steam. The purpose of this report is to assess the potential market for solar thermal applications in the North African countries of Algeria, Egypt, Morocco and Tunisia. North Africa was selected because of its outstanding solar resource base and the variety of applications to be found there. Diminishing oil and gas resources, coupled with expanding energy needs, opens a large potential market for the US industry. The US high temperature solar trough industry has little competition globally and could build a large market in these areas. The US is already familiar with certain solar markets in North Africa due to the supplying of substantial quantities of US-manufactured flat plate collectors to this region.

Not Available

1990-12-01T23:59:59.000Z

446

Goa, India Permeability of Charnokite Rock at High Temperatures  

E-Print Network (OSTI)

ABSTRACT: Permeability at high temperature is a very important parameter to be considered for designing underground high level nuclear waste repository (HLW) in rock mass. The surrounding rock mass is exposed to heat radiated by HLW when it is buried underground and development or extension of micro-cracks takes place in the host rock due to rise in temperature. Keeping this in view, the permeability study was conducted for Charnokite rock at high temperatures in the range from room temperature, 30 to 200 o C. The cylindrical rock samples of 36mm diameter and 150mm in length were used as per the required size for the equipment permeameter, TEMCO, USA. Total thirty rock samples were tested at various temperatures using nitrogen gas as fluid. The permeability tests were conducted at confining pressure of around 4MPa in order to simulate the horizontal in situ stress conditions in Charnokite rock at the depth of 400m for construction of HLW repository. 1

R. D. Dwivedi; R. K. Goel; A. Swarup; V. V. R. Prasad; R. K. Bajpai; P. K. Narayan; V. Arumugam

2008-01-01T23:59:59.000Z

447

Operating high temperature (1000/sup 0/C) electrolysis demonstration unit  

SciTech Connect

Phase I of the BNL Fusion Synfuel Demonstration Program has been the successful construction and demonstration of a 100-W electrically-heated, high-temperature electrolysis unit operating at a temperature of 1000/sup 0/C. The high-temperature electrolyzer demonstration unit consists of 34 yttria-stabilized zirconia tubes contained in a 15-cm (od), 30-cm long INCONEL pressure vessel. The tubes are 25-cm long (active length), 0.64-cm (od), and coated on the inside with platinum to form the oxygen electrode and coated on the outside with nickel to form the hydrogen electrode. The 1000/sup 0/C steam is raised by electrically heating water. The system is designed to produce approx. 6 cc/s of hydrogen.

Horn, F.L.; Powell, J.R.; Fillo, J.A.

1981-01-01T23:59:59.000Z

448

Liquid Fuel Production from Biomass via High Temperature Steam Electrolysis  

DOE Green Energy (OSTI)

A process model of syngas production using high temperature electrolysis and biomass gasification is presented. Process heat from the biomass gasifier is used to heat steam for the hydrogen production via the high temperature steam electrolysis process. Hydrogen from electrolysis allows a high utilization of the biomass carbon for syngas production. Oxygen produced form the electrolysis process is used to control the oxidation rate in the oxygen-fed biomass gasifier. Based on the gasifier temperature, 94% to 95% of the carbon in the biomass becomes carbon monoxide in the syngas (carbon monoxide and hydrogen). Assuming the thermal efficiency of the power cycle for electricity generation is 50%, (as expected from GEN IV nuclear reactors), the syngas production efficiency ranges from 70% to 73% as the gasifier temperature decreases from 1900 K to 1500 K. Parametric studies of system pressure, biomass moisture content and low temperature alkaline electrolysis are also presented.

Grant L. Hawkes; Michael G. McKellar

2009-11-01T23:59:59.000Z

449

Adaptable Sensor Packaging for High Temperature Fossil Fuel Energy System  

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

Adaptable Sensor Packaging for High Adaptable Sensor Packaging for High Temperature Fossil Fuel Energy Systems Background The Advanced Research Sensors and Controls Program is leading the effort to develop sensing and control technologies and methods to achieve automated and optimized intelligent power systems. The program is led by the U.S. Department of Energy (DOE) Office of Fossil Energy National Energy Technology Laboratory (NETL) and is implemented through research and development agreements with other

450

Amorphous Alloy Membranes for High Temperature Hydrogen Separations  

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

for High for High Temperature Hydrogen Separations Background Coal and biomass are readily available in the United States and can be mixed for thermal processing to produce hydrogen and power. The produced hydrogen can be sent directly to a fuel cell for highly efficient and environmentally clean power generation. For coal and biomass to become economically viable sources of hydrogen, more efficient production processes need to be developed. To meet this

451

High Temperature Syngas Cleanup Technology Scale-up  

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

RECOVERY ACT: Scale-Up of RECOVERY ACT: Scale-Up of High-Temperature Syngas Cleanup Technology Background Coal gasification generates a synthesis gas (syngas)-predominantly a mixture of carbon monoxide (CO) and hydrogen (H 2 )-that can be used for chemical production of hydrogen, methanol, substitute natural gas (SNG), and many other industrial chemicals, or for electric power generation. Conventional integrated gasification combined cycle (IGCC) power plants use this syngas as a fuel for a combustion

452

High temperature superconductivity in metallic region near Mott transition  

E-Print Network (OSTI)

The spin-singlet superconductivity without phonons is examined in consideration of correlations on an extended Hubbard model. It is shown that the superconductivity requires not only the total correlation should be strong enough but also the density of state around Fermi energy should be large enough, which shows that the high temperature superconductivity could only be found in the metallic region near the Mott metal insulator transition (MIT). Other properties of superconductors are also discussed on these conclusions.

Tian De Cao

2009-06-11T23:59:59.000Z

453

High temperature sodium testing of the CRBR prototype primary pump  

Science Conference Proceedings (OSTI)

Qualification testing in sodium of the CRBR primary pump was conducted through 1982. This paper presents an overview of the test program, a description of the Sodium Pump Test Facility (largest of its kind in the world), a brief description of the test article and summary overview of results. Of special interest were the high temperature gas convection tests and the extensive flow/speed control (dynamic) tests. Special innovative test methods were employed to investigate these phenomena.

Tessier, M.J.; Grimaldi, J.L.

1983-01-01T23:59:59.000Z

454

Accelerated Aging Test of High-Temperature Conductor and Connectors  

Science Conference Proceedings (OSTI)

As part of the research on high-temperature low-sag (HTLS) advanced conductors, this project investigates the long-term performance of commercially available advanced conductors to complement the field demonstration project, which provided information on handling and stringing of these conductors. The report provides preliminary results from the accelerated aging tests conducted on various types of HTLS conductors and their connectors. The objective of the accelerated aging tests is to determine the ...

2012-12-12T23:59:59.000Z

455

HTC (High-Temperature Conductor) Matrix: Version 4.1  

Science Conference Proceedings (OSTI)

EPRI’s HTC Matrix software is a Windows application designed to provide the user with quick and directed access to all of the information developed under several EPRI projects investigating the effects of high temperature operation of conductors. The research results have been published in several technical reports.  Benefits & ValueThe user can determine whether a certain type of connectors can be used at a specific ...

2012-11-05T23:59:59.000Z

456

Thermal Models of Overhead Transmission Lines Operating at High Temperatures  

Science Conference Proceedings (OSTI)

Bare stranded overhead transmission line conductorsreferred to as aluminum conductor steel reinforced ACSRtypically consist of at least two layers of aluminum strands, helically stranded around a core consisting of steel wires. The current that flows through such conductors is located predominantly in the aluminum layers while the steel core provides mechanical strength and limits sag at high temperature. The lack of new line construction combined with the decoupling of transmission from power generatio...

2010-12-23T23:59:59.000Z

457

High-temperature hydrothermal systems in West Yunnan Province, China  

SciTech Connect

There are more than 660 thermal springs in West Yunnan Province, 30 of which are high-temperature hydrothermal systems with reservoir temperatures above 150/sup 0/C. All thermal springs in West Yunnan are under the control of tectonics, most of them distributed at anticlinoria of metamorphic rocks and granites. This paper discusses the relationship between thermal areas and tectonics, the correlation between thermal springs in West Yunnan and North Thailand, and the geothermal prospects in West Yunnan.

Laio, Z.; Tong, W.; Liu, S.; Zhao, F.

1986-01-01T23:59:59.000Z

458

Secret high-temperature reactor concept for inertial fusion  

DOE Green Energy (OSTI)

The goal of our SCEPTRE project was to create an advanced second-generation inertial fusion reactor that offers the potential for either of the following: (1) generating electricity at 50% efficiency, (2) providing high temperature heat (850/sup 0/C) for hydrogen production, or (3) producing fissile fuel for light-water reactors. We have found that these applications are conceptually feasible with a reactor that is intrinsically free of the hazards of catastrophic fire or tritium release.

Monsler, M.J.; Meier, W.R.

1983-01-01T23:59:59.000Z

459

Guide for Operating Overhead Lines at High Temperatures  

Science Conference Proceedings (OSTI)

This Guide assists users in raising the capacities of overhead transmission lines by increasing the conductor temperature. It is based on a wealth of knowledge accumulated from extensive research conducted internally at the Electric Power Research Institute (EPRI), information from manufacturers, and results from research conducted outside of EPRI. The Guide evolved from a collection of numerous EPRI reports published in the past, for example, Effect of High-Temperature Cycling on Conductor Systems (EPRI...

2010-12-13T23:59:59.000Z

460

Expansion Joint Concepts for High Temperature Insulation Systems  

E-Print Network (OSTI)

As high temperature steam and process piping expands with heat, joints begin to open between the insulation sections, resulting in increased energy loss and possible unsafe surface temperatures. Many different expansion joint designs are presently in use for both single and double layer insulation construction. However, due to the installation cost reduction associated with single layer systems and increased thickness capabilities of insulation manufacturers, much attention is being given to utilizing single layer construction as much as possible.

Harrison, M. R.

1980-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "include high-temperature parabolic" 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

Ultra high temperature instrumentation amplifier components final report  

DOE Green Energy (OSTI)

In order to develop a downhole instrumentation amplifier to support geothermal well logging without thermal protection, all the components required were tested over the temperature range of 25 to 500/sup 0/C. The components tested were ceramic vacuum tubes, resistors, capacitors, insulated hook-up wire, circuit boards, terminals, connectors, feedthroughs, thermal switch, magnet wire, and high temperature coatings and cements. Details of the tests are presented for all components. (MHR)

Kelly, R.D.; Morse, C.P.; Cannon, W.L.

1977-09-01T23:59:59.000Z

462

Growth of Thick, On-Axis SiC Epitaxial Layers by High Temperature ...  

Science Conference Proceedings (OSTI)

... Layers by High Temperature Halide CVD for High Voltage Power Devices ... rate, high temperature process ideally suited for thick epitaxial requirements.

463

HIGH TEMPERATURE CONDUCTIVITY PROBE FOR MONITORING CONTAMINATION LEVELS IN POWER PLANT BOILER WATER.  

E-Print Network (OSTI)

??A high temperature/high pressure flow through probe was designed to measure high temperature electrical conductivity of aqueous (aq) dilute electrolyte solutions, an application which can… (more)

Hipple, Sarah

2008-01-01T23:59:59.000Z

464

EA-0510: High-Temperature Solid Oxide Fuel Cell (Sofc) Generator...  

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

510: High-Temperature Solid Oxide Fuel Cell (Sofc) Generator Development Project (METC), Churchill, Pennsylvania EA-0510: High-Temperature Solid Oxide Fuel Cell (Sofc) Generator...

465

INTEGRATION OF HIGH TEMPERATURE GAS REACTORS WITH IN SITU OIL SHALE RETORTING  

Science Conference Proceedings (OSTI)

This paper evaluates the integration of a high-temperature gas-cooled reactor (HTGR) to an in situ oil shale retort operation producing 7950 m3/D (50,000 bbl/day). The large amount of heat required to pyrolyze the oil shale and produce oil would typically be provided by combustion of fossil fuels, but can also be delivered by an HTGR. Two cases were considered: a base case which includes no nuclear integration, and an HTGR-integrated case.

Eric P. Robertson; Michael G. McKellar; Lee O. Nelson

2011-05-01T23:59:59.000Z

466

ECUT energy data reference series: high-temperature materials for advanced heat engines  

DOE Green Energy (OSTI)

Information that describes the use of high-temperature materials in advanced heat engines for ground transportation applications is summarized. Applications discussed are: automobiles, light trucks, and medium and heavy trucks. The information provided on each of these modes includes descriptions of the average conversion efficiency of the engine, the capital stock, the amount of energy used, and the activity level as measured in ton-miles.

Abarcar, R.B.; Hane, G.J.; Johnson, D.R.

1984-07-01T23:59:59.000Z

467

High Temperature, High Pressure Devices for Zonal Isolation in Geothermal  

Open Energy Info (EERE)

Temperature, High Pressure Devices for Zonal Isolation in Geothermal Temperature, High Pressure Devices for Zonal Isolation in Geothermal Wells Geothermal Project Jump to: navigation, search Last modified on July 22, 2011. Project Title High Temperature, High Pressure Devices for Zonal Isolation in Geothermal Wells Project Type / Topic 1 Recovery Act: Enhanced Geothermal Systems Component Research and Development/Analysis Project Type / Topic 2 Zonal Isolation Project Description For Enhanced Geothermal Systems (EGS), high-temperature high-pressure zonal isolation tools capable of withstanding the downhole environment are needed. In these wells the packers must withstand differential pressures of 5,000 psi at more than 300°C, as well as pressures up to 20,000 psi at 200°C to 250°C. Furthermore, when deployed these packers and zonal isolation tools must form a reliable seal that eliminates fluid loss and mitigates short circuiting of flow from injectors to producers. At this time, general purpose open-hole packers do not exist for use in geothermal environments, with the primary technical limitation being the poor stability of existing elastomeric seals at high temperatures.

468

Particle-hole symmetry broken pseudogap in high temperature superconductors  

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

Particle-hole symmetry broken pseudogap in Particle-hole symmetry broken pseudogap in high temperature superconductors High-temperature (Tc) superconductivity is one of the most important topics in condensed matter physics. Despite extensive studies over more than two decades, the microscopic mechanism of high temperature superconductivity still remains elusive due to many unconventional properties that are not well understood. Among them, the most mysterious behavior of high-Tc superconductor is the nature of so called "pseudogap", which has been a focus of the field for many years. In conventional superconductors, a gap exists in the energy absorption spectrum only below Tc, corresponding to the energy price to pay for breaking a Cooper pair of electrons. In high-Tc cuprate superconductors, an energy gap called the pseudogap exists above Tc but below T*, and is controversially attributed either to pre-formed superconducting pairs or to competing phases. Recently, by carefully studying the "symmetry" of the gap, researchers Makoto Hashimoto and Rui-Hua He, along with their co-workers in Prof. Zhi-Xun Shen's group at Stanford University, have found crucial evidence suggesting that the particle-hole symmetry required by superconductivity is broken in the pseudogap state.

469

Pseudogap and Superconducting Gap in High-Temperature Superconductors  

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

Pseudogap and Superconducting Gap in Pseudogap and Superconducting Gap in High-Temperature Superconductors Two decades after the discovery of first high temperature superconductors, the microscopic mechanism of high-Tc superconductivity remains elusive. In conventional superconductors, it has been well established that electrons form so-called "Cooper pairs" to give rise to superconductivity. The pair binding manifests itself as an energy gap in many spectroscopic measurements. This energy gap, known as superconducting gap, appears at the superconducting transition temperature Tc where the resistance also vanishes. For high temperature superconductors, the story is more complicated. Over a wide region of compositions and temperatures, there exists an energy gap well above Tc. This energy gap is called pseudogap [1], because there is no direct correlation to the superconducting transition. The origin of this pseudogap and its relation to the superconducting gap are believed to hold the key for understanding the mechanism of high-Tc superconductivity - one of the outstanding problems in condensed matter physics. In this regard, researchers Kiyohisa Tanaka and Wei-Sheng Lee, along with their co-workers in Prof. Zhi-Xun Shen's group at Stanford University, have recently made an important discovery about the coexistence of two distinct energy gaps that have opposite doping dependence. Their observation not only provides a natural explanation for the contradictory results about the superconducting gap deduced from different experimental techniques, but also has profound implications on the mechanism of high-Tc superconductivity.

470

High power densities from high-temperature material interactions  

DOE Green Energy (OSTI)

Thermionic energy conversion (TEC) and metallic-fluid heat pipes (MFHPs) offer important and unique advantages in terrestrial and space energy processing. And they are well suited to serve together synergistically. TEC and MFHPs operate through working-fluid vaporization, condensation cycles that accept great thermal power densities at high temperatures. TEC and MFHPs have apparently simple, isolated performance mechanisms that are somewhat similar. And they also have obviously difficult, complected material problems that again are somewhat similar. Intensive investigation reveals that aspects of their operating cycles and material problems tend to merge: high-temperature material effects determine the level and lifetime of performance. Simplified equations verify the preceding statement for TEC and MFHPs. Material properties and interactions exert primary influences on operational effectiveness. And thermophysicochemical stabilities dictate operating temperatures which regulate the thermoemissive currents of TEC and the vaporization flow rates of MFHPs. Major high-temperature material problems of TEC and MFHPs have been solved. These solutions lead to productive, cost-effective applications of current TEC and MFHPs - and point to significant improvements with anticipated technological gains.

Morris, J.F.

1981-01-01T23:59:59.000Z

471

Current Status of the Advanced High Temperature Reactor  

SciTech Connect

The Advanced High Temperature Reactor (AHTR) is a design concept for a central station type [1500 MW(e)] Fluoride salt-cooled High-temperature Reactor (FHR) that is currently under development by Oak Ridge National Laboratory for the U. S. Department of Energy, Office of Nuclear Energy's Advanced Reactor Concepts program. FHRs, by definition, feature low-pressure liquid fluoride salt cooling, coated-particle fuel, a high-temperature power cycle, and fully passive decay heat rejection. The overall goal of the AHTR development program is to demonstrate the technical feasibility of FHRs as low-cost, large-size power producers while maintaining full passive safety. The AHTR design option exploration is a multidisciplinary design effort that combines core neutronic and fuel configuration evaluation with structural, thermal, and hydraulic analysis to produce a reactor and vessel concept and place it within a power generation station. The AHTR design remains at the notional level of maturity, as key technologies require further development and a logically complete integrated design has not been finalized. The present design space exploration, however, indicates that reasonable options exist for the AHTR core, primary heat transport path, and fuel cycle provided that materials and systems technologies develop as anticipated.

Holcomb, David Eugene [ORNL; Ilas, Dan [ORNL; Qualls, A L [ORNL; Peretz, Fred J [ORNL; Varma, Venugopal Koikal [ORNL; Bradley, Eric Craig [ORNL; Cisneros, Anselmo T. [University of California, Berkeley

2012-01-01T23:59:59.000Z

472

GaAs ohmic contacts for high temperature devices  

DOE Green Energy (OSTI)

Instrumentation requirements for geothermal wells, jet engines, and nuclear reactors have exceeded the high temperature capability of silicon devices. As one part of a program to develop high temperature compound semiconductor devices, four basic ohmic contact systems for n-type GaAs have been evaluated for contact resistance as a function of temperature (24 to 350/sup 0/C) and time (at 300/sup 0/C): Ni/AuGe; Ag/Si and Ag/Ni/Si; Al/Ge and Al/AlGe; and Au/Nb/Si and Pt/Nb/Si. Optimization of processing parameters produced viable high temperature contacts with all but the Al/Ge systems. Aging at 300/sup 0/C changed the contact resistivity in only the Ag/Ni/Si contacts. Film adhesion was excellent for the Al/Ge, Ni/AuGe, and Ag/Si systems as measured with ultrasonic Al wire bond pull strengths. Lower adhesion was noticed with Nb/Si systems measured with gold wire bond pull strengths.

Coquat, J.A.; Palmer, D.W.

1980-01-01T23:59:59.000Z

473

High temperature thermal properties for metals used in LWR vessels  

Science Conference Proceedings (OSTI)

Because of the impact that melt relocation and vessel failure has on subsequent progression and associated consequences of an Light Water Reactor (LWR) accident, it is important to accurately predict the heatup and relocation of materials within the reactor vessel and heat transfer to and from the reactor vessel. Accurate predictions of such heat transfer phenomena require high temperature thermal properties. However, a review of vessel and structural steel material properties in severe accident analysis codes reveals that the required high temperature material properties are extrapolated, with little if any, data above 700 ºC. To reduce uncertainties in predictions relying upon this extrapolated high temperature data, INL obtained data using laser-flash thermal diffusivity techniques for two metals used in LWR vessels: SA533B1 carbon steel, which is used to fabricate most US LWR reactor vessels; and SS304, which is used in LWR vessel piping, penetration tubes, and internal structures. This paper summarizes the new data, compares it to existing data in the literature, and provides recommended correlations for thermal properties based on this data.

Joy L. Rempe

2008-01-01T23:59:59.000Z

474

Study of Catcher Bearings for High Temperature Magnetic Bearing Application  

E-Print Network (OSTI)

The Electron Energy Corporation (EEC) along with National Aeronautics and Space Administration (NASA) in collaboration with Vibration Control and Electro mechanics Lab (VCEL), Texas A & M University, College Station, TX are researching on high temperature permanent magnet based magnetic bearings. The magnetic bearings are made of high temperature resistant permanent magnets (up to 1000 degrees F). A test rig has been developed to test these magnetic bearings. The test rig mainly consists of two radial bearings, one axial thrust bearing and two catcher bearings. The test rig that the catcher bearing is inserted in is the first ultra-high temperature rig with permanent magnet biased magnetic bearings and motor. The magnetic bearings are permanent magnet based which is a novel concept. The Graphalloy bearings represent a new approach for ultra-high temperature backup bearing applications. One of the main objectives of this research is to insure the mechanical and electrical integrity for all components of the test rig. Some assemblies and accessories required for the whole assembly need to be designed. The assembly methods need to be designed. The preliminary tests for coefficient of friction, Young's modulus and thermal expansion characteristics for catcher bearing material need to be done. A dynamic model needs to be designed for studying and simulating the rotor drop of the shaft onto the catcher bearing using a finite element approach in MATLAB. The assembly of the test rig was completed successfully by developing assembly fixtures and assembly methods. The components of the test rig were tested before assembly. Other necessary systems like Sensor holder system, Graphalloy press fit system were designed, fabricated and tested. The catcher bearing material (Graphalloy) was tested for coefficient of friction and Young's modulus at room and high temperatures. The rotor drop was simulated by deriving a dynamic model, to study the effect of system parameters like clearance, coefficient of friction, negative stiffness, initial spin speed on system behavior. Increasing the friction increases the backward whirl and decreases the rotor stoppage time. Increasing the clearance reduces the stoppage time and increases the peak bearing force. Increasing the initial spin speed increases the rotor stoppage time. The maximum stress encountered for as built conditions is more than allowable limits.

Narayanaswamy, Ashwanth

2011-05-01T23:59:59.000Z

475

Improved Materials for High-Temperature Black Liquor Gasification  

SciTech Connect

The laboratory immersion test system built and operated at ORNL was found to successfully screen samples from numerous refractory suppliers, including both commercially available and experimental materials. This system was found to provide an accurate prediction of how these materials would perform in the actual gasifier environment. Test materials included mullites, alumino-silicate bricks, fusion-cast aluminas, alumina-based and chrome-containing mortars, phosphate-bonded mortars, coated samples provided under an MPLUS-funded project, bonded spinels, different fusion-cast magnesia-alumina spinels with magnesia content ranging from 2.5% to about 60%, high-MgO castable and brick materials, spinel castables, and alkali-aluminate materials. This testing identified several candidate material systems that perform well in the New Bern gasifier. Fusion-cast aluminas were found to survive for nearly one year, and magnesia-alumina spinels have operated successfully for 18 months and are expected to survive for two years. Alkali-aluminates and high-MgO-content materials have also been identified for backup lining applications. No other material with a similar structure and chemical composition to that of the fusion-cast magnesium-aluminum spinel brick currently being used for the hot-face lining is commercially available. Other materials used for this application have been found to have inferior service lives, as previously discussed. Further, over 100 laboratory immersion tests have been performed on other materials (both commercial and experimental), but none to date has performed as well as the material currently being used for the hot-face lining. Operating experience accumulated with the high-temperature gasifier at New Bern, North Carolina, has confirmed that the molten alkali salts degrade many types of refractories. Fusion-cast alumina materials were shown to provide a great improvement in lifetime over materials used previously. Further improvement was realized with fusion-cast magnesia-alumina spinel refractory, which appears to be the most resistant to degradation found to date, exhibiting over a year of service life and expected to be capable of over two years of service life. Regarding the use of refractory mortar, it was found that expansion of the current chrome-alumina mortar when subjected to black liquor smelt is likely contributing to the strains seen on the vessel shell. Additionally, the candidate high-alumina mortar that was originally proposed as a replacement for the current chrome-alumina mortar also showed a large amount of expansion when subjected to molten smelt. A UMR experimental mortar, composed of a phosphate bonded system specifically designed for use with fusion-cast magnesium-aluminum spinel, was found to perform well in the molten smelt environment. Strain gauges installed on the gasifier vessel shell provided valuable information about the expansion of the refractory, and a new set of strain gauges and thermocouples has been installed in order to monitor the loading caused by the currently installed spinel refractory. These results provide information for a direct comparison of the expansion of the two refractories. Measurements to date suggest that the fusion-cast magnesia-alumina spinel is expanding less than the fusion-cast {alpha}/{beta}-alumina used previously. A modified liquor nozzle was designed and constructed to test a number of materials that should be more resistant to erosion and corrosion than the material currently used. Inserts made of three erosion-resistant metallic materials were fabricated, along with inserts made of three ceramic materials. The assembled system was sent to the New Bern mill for installation in the gasifer in 2005. Following operation of the gasifier using the modified nozzle, inserts should be removed and analyzed for wear by erosion/corrosion. Although no materials have been directly identified for sensor/thermocouple protection tubes, several of the refractory material systems identified for lining material applications may be applicable for use in this

Keiser, J.R.; Hemrick, J.G.; Gorog, J.P.; Leary, R.

2006-06-29T23:59:59.000Z

476

Mean wind forces on parabolic-trough solar collectors  

DOE Green Energy (OSTI)

The purpose of this study was to investigate characteristics of mean wind loads produced by airflow in and around several configurations of parabolic trough solar collectors with and without a wind fence. Four basic parabolic shapes were investigated as single units and one shape was studied as part of several array fields. One 1:25 scale model of each parabolic shape was constructed for mounting on a force balance to measure two forces and three moments. The effects of several dominant variables were investigated in this study: wind-azimuth (or yaw), trough elevation (or pitch) angle, array field configuration, and protective wind fence characteristics. All measurements were made in a boundary-layer flow developed by the meteorological wind tunnel at the Fluid Dynamics and Diffusion Laboratory of Colorado State University. Results are presented and discussed. (WHK)

Peterka, J.A.; Sinau, J.M.; Cermak, J.E.

1980-05-01T23:59:59.000Z

477

Interpretation of parabolic arcs in pulsar secondary spectra  

E-Print Network (OSTI)

Pulsar dynamic spectra sometimes show organised interference patterns; these patterns have been shown to have power spectra which often take the form of parabolic arcs, or sequences of inverted parabolic arclets whose apexes themselves follow a parabolic locus. Here we consider the interpretation of these arc and arclet features. We give a statistical formulation for the appearance of the power spectra, based on the stationary phase approximation to the Fresnel-Kirchoff integral. We present a simple analytic result for the power-spectrum expected in the case of highly elongated images, and a single-integral analytic formulation appropriate to the case of axisymmetric images. Our results are illustrated in both the ensemble-average and snapshot regimes. Highly anisotropic scattering appears to be an important ingredient in the formation of the observed arclets.

Mark Walker; Don Melrose; Dan Stinebring; Chengmin Zhang

2004-03-25T23:59:59.000Z

478

The first Chern form on moduli of parabolic bundles  

E-Print Network (OSTI)

For moduli space of stable parabolic bundles on a compact Riemann surface, we derive an explicit formula for the curvature of its canonical line bundle with respect to Quillen's metric and interpret it as a local index theorem for the family of dbar-operators in associated parabolic endomorphism bundles. The formula consists of two terms: one standard (proportional to the canonical Kaehler form on the moduli space), and one nonstandard, called a cuspidal defect, that is defined by means of special values of the Eisenstein-Maass series. The cuspidal defect is explicitly expressed through curvature forms of certain natural line bundles on the moduli space related to the parabolic structure. We also compare our result with Witten's volume computation.

Leon A. Takhtajan; Peter G. Zograf

2006-09-26T23:59:59.000Z

479

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

480

Federal technology alert. Parabolic-trough solar water heating  

DOE Green Energy (OSTI)

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

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481

Advanced materials and electrochemical processes in high-temperature solid electrolytes  

DOE Green Energy (OSTI)

Fuel cells for the direct conversion of fossil fuels to electric energy necessitates the use of high-temperature solid electrodes. This study has included: (1) determination of electrical transport, thermal and electrical properties to illucidate the effects of microstructure, phase equilibria, oxygen partial pressure, additives, synthesis and fabrication on these properties; (2) investigation of synthesis and fabrication of advanced oxide materials, such as La{sub 0.9}Sn{sub 0.1}MnO{sub 3}; and (3) application of new analytical techniques using complex impedance coupled with conventional electrochemical methods to study the electrochemical processes and behavior of materials for solid oxide fuel cells and other high-temperature electrolyte electrochemical process. 15 refs., 10 figs., 2 tabs. (BM)

Bates, J.L.; Chick, L.A.; Youngblood, G.E.; Weber, W.J.

1990-10-01T23:59:59.000Z

482