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Note: This page contains sample records for the topic "marketplace constraints limit" from the National Library of EnergyBeta (NLEBeta).
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1

Higgs Mass Constraints on a Fourth Family: Upper and Lower Limits on CKM Mixing  

E-Print Network (OSTI)

June 25, 2010 Higgs Mass Constraints on a Fourth Family:and experimental limits on the Higgs boson mass restrict CKMGeV lower limit on the Higgs boson mass that is especially

Chanowitz, Michael S.

2010-01-01T23:59:59.000Z

2

In today's highly competitive marketplace,  

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

today's highly competitive marketplace, rapid creation today's highly competitive marketplace, rapid creation and commercialization of scientific advances and innovative technologies are key to the continued prosperity of the United States. Scientists and engineers at Lawrence Livermore National Laboratory (LLNL) have achieved numerous science and technology breakthroughs that have led to new industries, spurred economic growth and benefited the national welfare.

3

The floating marketplace of San Juan Bay  

E-Print Network (OSTI)

This thesis seeks to establish the marketplace as a temporal and spatial event that affects a city in a meaningful way. The marketplace was the site of greatest congestion, activity and drama in many cities, often combining ...

Carbonell, Jorge (Jorge R.), 1975-

2002-01-01T23:59:59.000Z

4

Electronic marketplaces and innovation: the Canadian experience  

Science Conference Proceedings (OSTI)

This paper examines electronic marketplaces as one "digital economy" innovation. Great expectations existed for electronic marketplaces in the late 1990s, leading to the establishment of hundreds of new venues for B2B buying and selling. It was ... Keywords: B2B, Canada, SMEs, e-commerce, electronic marketplaces, innovation, international trade

Philip Rosson; Charles Davis

2004-07-01T23:59:59.000Z

5

Bioethanol: Moving into the Marketplace  

DOE Green Energy (OSTI)

In the last 10 years advances in biotechnology have reduced the cost of bioethanol by almost 25%. The DOE bioethanol program targets process improvements intended to allow bioethanol to compete with gasoline in the marketplace. Researchers are utilizing biomass feedstock for bioethanol conversion. The bioethanol conversion technology depends on hydrolysis and fermentation. To maximize biomass fermentation, biotechnology researchers have produced new strains of yeast and bacteria.

Sheehan, J.

2000-09-28T23:59:59.000Z

6

The impact of business-to-business electronic marketplaces: a field study  

Science Conference Proceedings (OSTI)

Although business to business electronic marketplaces (EMs) are new phenomena and their impact on firms is still limited, its worth well keeping track of the impacts since more and more firms participate in EMs. This research is a preliminary ...

Shan Wang; Shi Zheng

2011-05-01T23:59:59.000Z

7

Primordial Magnetic Field Limits from CMB Trispectrum - Scalar Modes and Planck Constraints  

E-Print Network (OSTI)

Cosmic magnetic fields are observed to be coherent on large scales and could have a primordial origin. Non-Gaussian signals in the cosmic microwave background (CMB) are generated by primordial magnetic fields as the magnetic stresses and temperature anisotropy they induce depend quadratically on the magnetic field. We compute the CMB scalar trispectrum on large angular scales, for nearly scale-invariant magnetic fields, sourced via the Sachs-Wolfe effect. The trispectra induced by magnetic energy density and by magnetic scalar anisotropic stress are found to have typical magnitudes of approximately $10^{-29}$ and $10^{-19}$, respectively. The scalar anisotropic stress trispectrum is also calculated in the flat-sky approximation and yields a similar result. Observational limits on CMB non-Gaussianity from the Planck mission data allow us to set upper limits of $B_0 \\lesssim 0.6 $ nG on the present value of the primordial cosmic magnetic field. Considering the inflationary magnetic curvature mode in the trispectrum can further tighten the magnetic field upper limit to $B_0 \\lesssim 0.05 $ nG. These sub-nanoGauss constraints from the magnetic trispectrum are the most stringent limits so far on the strength of primordial magnetic fields, on megaparsec scales, significantly better than the limits obtained from the CMB bispectrum and the CMB power spectrum.

Pranjal Trivedi; Kandaswamy Subramanian; T. R. Seshadri

2013-12-18T23:59:59.000Z

8

SunShot Initiative: Marketplace Maturity  

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

Costs Lowering Barriers Fostering Growth Marketplace Maturity Photo of houses with solar panels on the roof. DOE-funded projects are behind about 30% of more than 1,800...

9

Technical constraints limiting application of enhanced oil recovery techniques to petroleum production in the United States  

SciTech Connect

In the interval since the publication in September 1980 of the technical constraints that inhibit the application of enhanced oil recovery techniques in the United States, there has been a large number of successful field trials of enhanced oil recovery (EOR) techniques. The Department of Energy has shared the costs of 28 field demonstrations of EOR with industry, and the results have been made available to the public through DOE documents, symposiums and the technical literature. This report reexamines the constraints listed in 1980, evaluates the state-of-the-art and outlines the areas where more research is needed. Comparison of the 1980 constraints with the present state-of-the-art indicates that most of the constraints have remained the same; however, the constraints have become more specific. 26 references, 6 tables.

Not Available

1984-01-01T23:59:59.000Z

10

Technical constraints limiting application of enhanced oil recovery techniques to petroleum production in the United States  

Science Conference Proceedings (OSTI)

A critical examination of the potential and the technical constraint that inhibit the application of enhanced oil recovery techniques in the United States has been initiated and is expected to continue. The examination is based on the results of extensive laboratory and field applications now underway under various forms of Department of Energy support. This interim report will be amplified as data become available and as progress is made toward resolving technical constraints. Comments on the approach and substance of the information contained herein are welcome.

Not Available

1980-05-01T23:59:59.000Z

11

Towards a trustworthy service marketplace for the future internet  

Science Conference Proceedings (OSTI)

Digital economy is moving towards offering advanced business services, integrated into different applications and consumed from heterogeneous devices. Considering the success of actual software marketplaces, it is possible to foresee that Service ... Keywords: security, service marketplace, trust, trustworthiness

Francesco Di Cerbo; Michele Bezzi; Samuel Paul Kaluvuri; Antonino Sabetta; Slim Trabelsi; Volkmar Lotz

2012-01-01T23:59:59.000Z

12

Evaporation-Limited Tropical Temperatures as a Constraint on Climate Sensitivity  

Science Conference Proceedings (OSTI)

Studies of paleoclimate and modern observations indicate that evaporative effects limit thermal response in equatorial regions. We develop a latitude-resolved, steady-state energy balance model which incorporates the effect of an evaporative ...

Martin I. Hoffert; Brian P. Flannery; Andrew J. Callegari; C. T. Hsieh; Warren Wiscombe

1983-07-01T23:59:59.000Z

13

Fossil energy: From laboratory to marketplace  

SciTech Connect

Fossil Energy-From Laboratory to Marketplace is a compendium of progress--progress achieved by teams of university, industrial, and government researchers working through the federal program to develop new, cleaner and more effective ways to produce and use the nation`s abundant fossil fuel resources. Generally, this report concentrates on research and development efforts conducted during the 1980s. Where necessary to provide an historical context, information is also drawn from the fossil energy research, development and demonstration programs of the 1970s.

Not Available

1991-04-01T23:59:59.000Z

14

Fossil energy: From laboratory to marketplace  

DOE Green Energy (OSTI)

Fossil Energy-From Laboratory to Marketplace is a compendium of progress--progress achieved by teams of university, industrial, and government researchers working through the federal program to develop new, cleaner and more effective ways to produce and use the nation's abundant fossil fuel resources. Generally, this report concentrates on research and development efforts conducted during the 1980s. Where necessary to provide an historical context, information is also drawn from the fossil energy research, development and demonstration programs of the 1970s.

Not Available

1991-04-01T23:59:59.000Z

15

Lean product development for the automotive niche vehicle marketplace.  

E-Print Network (OSTI)

??The automotive low volume niche vehicle marketplace is growing, evidenced by increasing media coverage and fierce competition between original equipment manufacturers. Development of niche vehicles… (more)

Kupczewski, Celeste D., 1974-

2005-01-01T23:59:59.000Z

16

An investigation to define the physical/chemical constraints which limit NO sub x emission reduction achievable by reburning  

DOE Green Energy (OSTI)

Reburning is a NO{sub x} control technology which uses fuel to reduce NO. Thus, the main heat release zone can be operated normally to achieve optimum combustion conditions without regard for NO{sub x} control. Objectives of this program are to define the physical and/or chemical constraints which prevent realization of Point 5 (85% NO{sub x} reduction) with reburning, to use this information to identify and test improved configurations for reburning as an NO{sub x} control technique on coal-fired boilers, and to test various methods which could be used in practice to reduce NO{sub x} during the burnout step of the reburning process. The program will be performed at two experimental scales. Bench scale studies will be carried out in a 100 {times} 10{sup 3} Btu/hr tunnel furnace to evaluate the importance of chemical and physical constraints in the absence of mixing limitations. A 10 {times} 10{sup 6} Btu/hr pilot scale facility will subsequently be used to investigate the impacts of finite rate mixing and determine methods of minimizing them. A series of experiments will be conducted to verify the various concepts and demonstrate the optimum configuration for an advanced reburning process to achieve 85% NO{sub x} reduction at a cost lower than SCR. 24 figs.

McCarthy, J. M.; Moller, E. C.; Chen, S. L.

1987-10-01T23:59:59.000Z

17

Event:CCCCC and SPREP-The Marketplace: Exchange of Climate Change...  

Open Energy Info (EERE)

Marketplace: Exchange of Climate Change Ideas and Themes Jump to: navigation, search Calendar.png CCCCC and SPREP-The Marketplace: Exchange of Climate Change Ideas and Themes:...

18

Photovoltaics: From the laboratory to the marketplace  

DOE Green Energy (OSTI)

Photovoltaics (PV), the direct conversion of sunlight to electricity, is experiencing significant improvements in technology performance and lowered costs. Fostering these improvements, the SERI Photovoltaic Advanced Research and Development (PV AR D) Project supports research and provides services to the US PV industry. This paper presents the recent advances and future direction of the PV project. Research areas are Fundamental and Supporting Research, Advanced Thin-Film Materials, High-Efficiency Materials, Module Development, and Systems Development. Materials of interest include amorphous silicon, copper indium diselenide, cadmium telluride, crystalline silicon, gallium arsenide and related alloys, transparent conductors, antireflection coatings, substrates, and encapsulants. The PV project inherently provides technology transfer that helps industry shorten the time to bring R D advances to the marketplace. SERI annually performs over 10,000 measurements for the entire PV community, participates in collaborative research, and welcomes visiting scientists. Two specific areas of recently increased national focus are: (1) manufacturing processes for cost-effective PV modules, and (2) systems development for high-value utility applications. The SERI research approach is based on facilitating direct contact between industry, electric utilities, and others interested in PV technology. This approach heavily relies on SERI/industry partnerships. The arrangements vary to address generic and company-specific problems to improve the US industry's competitive position and accelerate greater electric utility deployment of PV systems. 5 refs., 5 figs., 6 tabs.

Basso, T.S.; Surek, T.; Thornton, J.

1991-03-01T23:59:59.000Z

19

New Online Marketplace for Small Business Contracting Launched by  

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

New Online Marketplace for Small Business Contracting Launched by New Online Marketplace for Small Business Contracting Launched by Presidential Fellows New Online Marketplace for Small Business Contracting Launched by Presidential Fellows January 17, 2013 - 2:54pm Addthis John Hale III John Hale III Director, Office of Small and Disadvantaged Business Utilization Editor's Note: This article was originally posted on the Small Business Administration's website. The U.S. Small Business Administration, in conjunction with the White House's Presidential Innovation Fellows, today launched a "beta" (pilot) version of RFP-EZ, a new online marketplace that streamlines the government contracting process, making it simpler for small businesses to find and bid on low-dollar contracts from federal agencies. The new program allows the government to source low-cost, high-impact

20

A Free Exchange e-Marketplace for Digital Services.  

E-Print Network (OSTI)

??The digital era is witnessing a remarkable evolution of digital services. While the prospects are countless, the e-marketplaces of digital services are encountering inherent game-theoretic… (more)

Ghonaim, Wafa M. I.

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "marketplace constraints limit" 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

Lean product development for the automotive niche vehicle marketplace  

E-Print Network (OSTI)

The automotive low volume niche vehicle marketplace is growing, evidenced by increasing media coverage and fierce competition between original equipment manufacturers. Development of niche vehicles must be lean and therefore ...

Kupczewski, Celeste D., 1974-

2005-01-01T23:59:59.000Z

22

Energy-efficient buildings: Does the marketplace work?  

SciTech Connect

For a variety of reasons, U.S. households, businesses, manufacturers, and government agencies all fail to take full advantage of cost-effective, energy-efficiency opportunities. Despite a growing environmental ethic among Americans and a concern for energy independence, consumers in this country are underinvesting in technologies, products, and practices that would cut their energy bills. The result is a large untapped potential for improving energy productivity, economic competitiveness, environmental quality, and energy security. The thesis of this paper is that the marketplace for energy efficiency, in general, is not operating perfectly, and the marketplace for energy-efficient buildings, in particular, is flawed. The reasons for underinvestments in cost-effective, energy efficiency are numerous and complicated. They also vary from sector to sector: the principal causes of energy inefficiencies in agriculture, manufacturing, and transportation are not the same as the causes of inefficiencies in homes and office buildings, although there are some similarities. One of the reasons for these differences is that the structure of marketplace for delivering new technologies and products in each sector differs. Energy-efficiency improvements in the buildings sector is critical to reducing greenhouse gas emissions, since most of the energy consumed in buildings comes from the burning of fossil fuels. This paper therefore begins by describing energy use and energy trends in the U.S. buildings sector. Characteristics of the marketplace for delivering energy efficiency technologies and products are then described in detail, arguing that this marketplace structure significantly inhibits rapid efficiency improvements.

Brown, M.A.

1996-12-31T23:59:59.000Z

23

Green academy helps researchers enter the marketplace | Department of  

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

Green academy helps researchers enter the marketplace Green academy helps researchers enter the marketplace Green academy helps researchers enter the marketplace March 29, 2010 - 11:07am Addthis Andrew Hargadon teaches a workshop at Green Technology Entrepreneurship Academy in Incline Village, Nevada.
| Photo Courtesy of University of California, Davis Andrew Hargadon teaches a workshop at Green Technology Entrepreneurship Academy in Incline Village, Nevada.
| Photo Courtesy of University of California, Davis Stephen Graff Former Writer & editor for Energy Empowers, EERE Before wading into the green energy sector, there are crucial things every budding entrepreneur should know: think like an investor, know your customer, and prove your research is going to solve a problem. To the business-savvy this advice may seem obvious, but for the

24

PPPL's MINDS Technology Takes Nuclear Detection to the Marketplace |  

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

PPPL's MINDS Technology Takes Nuclear Detection to the Marketplace PPPL's MINDS Technology Takes Nuclear Detection to the Marketplace PPPL's MINDS Technology Takes Nuclear Detection to the Marketplace October 20, 2011 - 5:25pm Addthis Charles Gentile (center) and other members of the MINDS team, including Ken Silber (right) and Bill Davis (left) work on new techniques to identify radionuclides. | Photo by Elle Starkman/Princeton Plasma Physics Laboratory Office of Communications Charles Gentile (center) and other members of the MINDS team, including Ken Silber (right) and Bill Davis (left) work on new techniques to identify radionuclides. | Photo by Elle Starkman/Princeton Plasma Physics Laboratory Office of Communications April Saylor April Saylor Former Digital Outreach Strategist, Office of Public Affairs What are the key facts?

25

DOE SUCCESS STORIES: THE ENERGY MISSION IN THE MARKETPLACE  

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

SUCCESS STORIES: THE ENERGY MISSION IN THE MARKETPLACE SUCCESS STORIES: THE ENERGY MISSION IN THE MARKETPLACE Published by: DOE Office of Science Policy 5/95 Contact person: Bob Marley, Director of Office of Science Policy, (202) 5863900 l DOE Success Stories: The Energy Mission in the Marketplace 0 Energy Mission 0 Role of Federal R&D 0 What Successes 0 Improved R&D 0 Economic Successes 0 R&D Management Principles 0 R&D Considerations 0 Deficit Reduction or Revenue Enhancement l Increasinp Energy Efficiency 0 Building Technologies n Fluorescent Lamp Electronic Ballasts n Advanced Energy Efficient Windows n Sulfur Lamp I Computerized AnalyticalTool for Energy Efficient Building Design n High Efficiency Refrigerator Freezer Compressor w Flame Retention Head Oil Burner n Flame Quality Indicator

26

Limiter  

DOE Patents (OSTI)

A limiter with a specially contoured front face is provided. The front face of the limiter (the plasma-side face) is flat with a central indentation. In addition, the limiter shape is cylindrically symmetric so that the limiter can be rotated for greater heat distribution. This limiter shape accommodates the various power scrape-off distances lambda p, which depend on the parallel velocity, V/sub parallel/, of the impacting particles.

Cohen, S.A.; Hosea, J.C.; Timberlake, J.R.

1984-10-19T23:59:59.000Z

27

A Game-Theoretic Model of E-Marketplace Participation Growth  

Science Conference Proceedings (OSTI)

Despite their potential to significantly reduce transaction costs for both buyers and sellers, e-marketplaces have struggled. Recent literature has examined the value propositions of e-marketplaces and proposed conceptual frameworks for their analysis. ... Keywords: Business-To-Business E-Commerce, E-Marketplace, Game Theory, Network Effect

Michael R. Galbreth; Salvatore T. March; Gary D. Scudder; Mikhael Shor

2005-05-01T23:59:59.000Z

28

A review of research on e-marketplaces 1997-2008  

Science Conference Proceedings (OSTI)

Electronic marketplaces are an important research theme on the information systems landscape. In this paper we examine twelve years of research on electronic marketplaces in leading information systems journals. The research articles are classified according ... Keywords: Content analysis, Electronic marketplaces, Review

Susan Standing; Craig Standing; Peter E. D Love

2010-04-01T23:59:59.000Z

29

Limiter  

SciTech Connect

A limiter with a specially contoured front face accommodates the various power scrape-off distances .lambda..sub.p, which depend on the parallel velocity, V.sub..parallel., of the impacting particles. The front face of the limiter (the plasma-side face) is flat with a central indentation. In addition, the limiter shape is cylindrically symmetric so that the limiter can be rotated for greater heat distribution.

Cohen, Samuel A. (Hopewell, NJ); Hosea, Joel C. (Princeton, NJ); Timberlake, John R. (Allentown, NJ)

1986-01-01T23:59:59.000Z

30

From the Lab to the Marketplace-Ten Years Later  

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

From the Lab to the Marketplace Ten Years Later, Energy Efficient Technologies from Research at the Lawrence Berkeley National Laboratory Berkeley Lab logo (left) with six rows of gray dots transitioning to a line art drawing of a cityscape and residential houses. From the Lab to the Marketplace Ten Years Later, Energy Efficient Technologies from Research at the Lawrence Berkeley National Laboratory Berkeley Lab logo (left) with six rows of gray dots transitioning to a line art drawing of a cityscape and residential houses. From the Lab to the Marketplace The United States consumes about 100 quadrillion BTUs (100 quads) of energy at the cost of $1 trillion each year, roughly 10% of our Gross Domestic Product. This energy is used by the nation's 114 million households, 82 billion square feet of commercial building floor space, 130 million cars, 95 million trucks, other modes of transportation, and by millions of manufacturing establishments large and small, to power the economy, and improve our lives. Burning fossil fuels to produce energy leads to a variety of well-known

31

DOE Research and Development for the Geothermal Marketplace  

DOE Green Energy (OSTI)

This audience is well aware that the major goal of all geothermal R&D is the successful application of advanced technology in the marketplace. In support of that goal, the Geothermal Technology Division has forged a close link between its research objectives and potentially competitive market applications. Our technical objectives are all expressed in quantified reductions in the cost of geothermal power; these cost reductions are the force that will drive the geothermal industry for the foreseeable future. I agree with the recent statement of Stephen Fye of Unocal that without a legislated incentive for geothermal or disincentive for competing fuels-such as mandated carbon dioxide reductions--any premium the public is willing to pay for the use of this premium fuel will be too small to greatly impact geothermal economics. His conclusion is that the geothermal industry must be fully competitive in the marketplace at current prices. His further conclusion--with which I fully concur--is that the avenue to competitiveness is through research, by both industry and government.

Mock, John E.

1989-03-21T23:59:59.000Z

32

Increasing Importance of Natural Gas Imports on the U.S. Marketplace  

Reports and Publications (EIA)

The growing importance of imported natural gas supplies in the U.S. marketplace, especially the northeast, is reflected in the two-fold increase in Canadian and overall net imports since 1990.

Information Center

2000-02-01T23:59:59.000Z

33

Reflfit - Tcl constraints  

Science Conference Proceedings (OSTI)

Tcl constraints. At present constraints are interpreted as Tcl code. This ... instead. The usual Tcl syntax applies to constraints. ...

34

The impact of consumer trust on attitudinal loyalty and purchase intentions in B2C e-marketplaces: Intermediary trust vs. seller trust  

Science Conference Proceedings (OSTI)

The online merchant of an e-marketplace consists of an intermediary, providing the market infrastructure, and the community of sellers conducting business within that infrastructure. Typically, consumers willingly buy from unknown sellers within an e-marketplace, ... Keywords: Attitudinal loyalty, B2C e-marketplace, Consumer trust, Intermediary, Purchase intentions

Ilyoo B. Hong; Hwihyung Cho

2011-10-01T23:59:59.000Z

35

NREL: Jobs and Economic Competitiveness - Supply Constraints...  

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

Supply Constraints Analysis Some of the materials used in solar PV modules, such as tellurium and indium, are rare materials in limited supply. Solar PV technologies have grown...

36

References : Appendices : From the Lab to the Marketplace-Ten Years Later  

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

References References From the Lab to the Marketplace Ten Years Later, Energy Efficient Technologies from Research at the Lawrence Berkeley National Laboratory Berkeley Lab logo (left) with six rows of gray dots transitioning to a line art drawing of a cityscape and residential houses. References General Lawrence Berkeley National Laboratory. From the Lab to the Marketplace: Making America's Buildings More Energy-Efficient. PUB-758, Revised March 1995. National Research Council. Energy Research at DOE: Was It Worth It? National Academy Press, Washington D.C., 2001. Lighting Ballasts Verderber, R.R. Electronic High Frequency Fluorescent Ballasts (Past, Present and Future). Energy Cost Avoidance in Education Buildings Conference, LBL-28792, 1990. Verderber, R.R. Fluorescent Lamp Fixtures and Ballasts. EPRI Lighting and

37

Taking Smart Grid Technology Out of the Lab and Into the Marketplace |  

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

Taking Smart Grid Technology Out of the Lab and Into the Taking Smart Grid Technology Out of the Lab and Into the Marketplace Taking Smart Grid Technology Out of the Lab and Into the Marketplace April 15, 2011 - 1:12pm Addthis Andrew Gumbiner Contractor, Advanced Research Projects Agency-Energy. What does this mean for me? The ARPA-E, Duke Energy and EPRI partnership will take early stage technologies out of the lab and test them to see if they can revolutionize the way we use and store electricity. These technologies are aimed at enhancing smart grid development, grid scale energy storage, power electronics, and energy efficient cooling systems. Duke Energy could deploy these technologies at its various power plants and wind farms, which serve approximately 4 million people. In his 2011 State of the Union address, President Obama challenged

38

Helping Small Businesses Bring Their Clean Energy Ideas to the Marketplace  

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

Small Businesses Bring Their Clean Energy Ideas to the Small Businesses Bring Their Clean Energy Ideas to the Marketplace Helping Small Businesses Bring Their Clean Energy Ideas to the Marketplace July 22, 2010 - 2:39pm Addthis Dr. Kristina Johnson Small businesses play a large role in shaping the American economy and the clean energy revolution. They're an engine of job growth -- creating around two out of every three new jobs in this country -- and they are sources of the innovation and bold ideas that our country needs to address our energy challenges. While larger firms and corporations provide the heft to help energy technologies reach global markets, small businesses thrive at the other end of the spectrum: in the innovation of new energy products and services. They're quicker to adopt new approaches and more willing to take on

39

THE U.S. DEPARTMENT OF ENERGY'S X-CHANGE 1997: THE GLOBAL D & D MARKETPLACE CONFERENCE, IG-0429  

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

The Department of Energy and Florida International University (FIU) cosponsored the "X-Change 1997: The Global D&D Marketplace" conference. The conference included speeches and workshops on...

40

Critical Operating Constraints Forecast-- Functional Specification  

Science Conference Proceedings (OSTI)

Critical operating constraints that could result in curtailments of load may occur in a transmission grid with areas of potential generation deficit and limited transmission import capacities. In such situations, it is crucial that the grid operators have a tool to predict when and where critical operating constraints would occur. This report describes the functional specification of such a decision support tool, called the COCF (Critical Operating Constraint Forecast).

2008-03-04T23:59:59.000Z

Note: This page contains sample records for the topic "marketplace constraints limit" 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

Impact of New Federal Efficiency Performance Standards on the Industrial Motor Marketplace  

E-Print Network (OSTI)

The Energy Independence and Security Act of 2007 enacted new motor efficiency standards that will go into effect in December 2010. Previous motor efficiency standards, which were implemented as part of EPAct in 1992, caused some confusion within the motor marketplace. In part, this confusion lead to the development of NEMA’s Premium® label, which has since helped guide motor purchasers to buy efficient motors. As a companion activity, the awareness program Motor Decisions Matter was established to encourage the replacement of motors with more efficient technology rather than the repair of old, inefficient motors. The motor marketplace now faces similar confusion as the new standards will soon be implemented. It is therefore incumbent upon industrial motor users to begin planning for these standards now, both by developing new motor management plans and by updating repair/replace decision criteria to reflect changes in efficiency and price for motor replacement options. At the same time, it is incumbent upon motor efficiency programs and policymakers to address the anticipated negative market behavior trends that will likely result from the new standards’ implementation in the next few years.

Elliott, R. N.

2009-05-01T23:59:59.000Z

42

The Current and Future Marketplace for Waste-To-Energy Cogeneration Facilities in the United States  

E-Print Network (OSTI)

The emerging waste-to-energy marketplace within the United States is one with considerable opportunity and risk. The solid waste management crisis is resulting in record construction levels for waste-to-energy facilities due to the fact that few viable alternatives exist for waste disposal. However, opposition to the construction of such plants and cost overruns on new and existing facilities is having an impact on the market. While approximately 135 plants were operating at the end of 1987, it is believed that 425 plants and projects will be in existence by the end of 1996. Representing a total capacity of 260,000 tons per day, by 1996 over 36% of all municipal solid waste generated in the United States will be incinerated by waste-to-energy facilities. A considerable challenge faces all suppliers of products and services to the marketplace. Increasing opposition and escalating costs for such plants will place greater emphasis upon proper planning, design flexibility, and pollution control. Like any emerging industry, this business will evolve from its current unpredictable levels to a more mature and stable market opportunity for suppliers of products and services.

Jacobs, S.

1988-09-01T23:59:59.000Z

43

From Mind to Marketplace: SunShot Incubator's Latest ProtĂ©gĂ©s Get to  

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

From Mind to Marketplace: SunShot Incubator's Latest Protégés From Mind to Marketplace: SunShot Incubator's Latest Protégés Get to Work From Mind to Marketplace: SunShot Incubator's Latest Protégés Get to Work October 22, 2013 - 1:00pm Addthis Workers from Clean Power Research review a software platform that aims to lower the costs associated with connecting distributed solar electricity generation to the grid. The platform is one of several projects funded through the Energy Department’s SunShot Incubator Program, which provides early-stage assistance to help small businesses cross technological barriers to commercialization. | Photo courtesy of Clean Power Research Workers from Clean Power Research review a software platform that aims to lower the costs associated with connecting distributed solar electricity

44

Berkeley Hood : Technologies : From the Lab to the Marketplace-Ten Years  

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

Hood Hood From the Lab to the Marketplace Ten Years Later, Energy Efficient Technologies from Research at the Lawrence Berkeley National Laboratory Berkeley Lab logo (left) with six rows of gray dots transitioning to a line art drawing of a cityscape and residential houses. Berkeley Hood The average fume hood consumes three-and-a-half-times as much energy as an average house in the U.S. Fume hoods are widely used to protect workers from breathing harmful substances in research laboratories, industrial shops, school labs and pharmaceutical and biotechnology facilities. A typical hood is a box, often mounted at tabletop level, with a moveable window-like "face" or sash. Hazardous fumes are drawn out of the hood through a port at the top. Researchers at Berkeley Lab estimate that the

45

Appliance Standards : New Concepts : From the Lab to the Marketplace-Ten  

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

Appliance Standards Appliance Standards From the Lab to the Marketplace Ten Years Later, Energy Efficient Technologies from Research at the Lawrence Berkeley National Laboratory Berkeley Lab logo (left) with six rows of gray dots transitioning to a line art drawing of a cityscape and residential houses. Appliance Standards Residential consumers spent $215 billion and commercial consumers spend $154 billion in 20051 on energy for appliances, heating and cooling equipment and lighting, which consumption resulted in 2305 million metric tons of carbon dioxide emissions2. For many years, Berkeley Lab researchers have provided the technical analysis used by the Department of Energy as it established energy efficiency standards for appliances mandated by law. Berkeley Lab's energy policy work includes analyzing the effects on energy

46

Credits : Appendices : From the Lab to the Marketplace-Ten Years Later  

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

Credits Credits From the Lab to the Marketplace Ten Years Later, Energy Efficient Technologies from Research at the Lawrence Berkeley National Laboratory Berkeley Lab logo (left) with six rows of gray dots transitioning to a line art drawing of a cityscape and residential houses. Credits Editor: Allan Chen Writer: Annalise Blum Additional Writing: Allan Chen Web Master: Sondra Jarvis Art Direction: Anthony Ma Contributors: Hashem Akbari, Barbara Atkinson, Geoffrey Bell, Paul Berdahl, Sam Berman, Fred Buhl, Robert Cheng, Kathy Ellington, William Fisk, David Fridley, Ashok Gadgil, Christina Galitsky, Stephen Johnson, Mark Levine, Ronnen Levinson, James McMahon, Michael McNeil, Steve Meyers, Evan Mills, Mark Modera, Lynn Price, Thomas Richardson, Francis Rubinstein, Max

47

Typing constraint logic programs  

Science Conference Proceedings (OSTI)

We present a prescriptive type system with parametric polymorphism and subtyping for constraint logic programs. The aim of this type system is to detect programming errors statically. It introduces a type discipline for constraint logic programs and ... Keywords: Constraint logic programming, Metaprogramming, Prolog, subtyping, type systems

François Fages; Emmanuel Coquery

2001-11-01T23:59:59.000Z

48

Logic programming with temporal constraints  

Science Conference Proceedings (OSTI)

Combines logic programming and temporal constraint processing techniques in a language called TCLP (Temporal Constraint Logic Programming), which augments logic programs with temporal constraints. Known algorithms for processing disjunctions in temporal ... Keywords: Datalog, Simple TCLP, TCLP language, decidable fragment, disjunction processing algorithms, quantification, relation symbols, syntactic structure, temporal constraint logic programming, temporal constraint networks, temporal constraint satisfaction problems, temporal logic, temporal occurrence intervals

E. Schwalb; L. Vila

1996-05-01T23:59:59.000Z

49

Mobile Concurrent Constraint Programming  

Science Conference Proceedings (OSTI)

This paper presents an extension of the concurrent constraint programming framework which supports distributed and mobile computations and an enhanced distributed synchronization mechanism.

Nicolas Romero

2001-09-01T23:59:59.000Z

50

Innovative Business Cases for Energy Storage In a Restructured Electricity Marketplace, A Study for the DOE Energy Storage Systems Program  

DOE Green Energy (OSTI)

This report describes the second phase of a project entitled ''Innovative Business Cases for Energy Storage in a Restructured Electricity Marketplace''. During part one of the effort, nine ''Stretch Scenarios'' were identified. They represented innovative and potentially significant uses of electric energy storage. Based on their potential to significantly impact the overall energy marketplace, the five most compelling scenarios were identified. From these scenarios, five specific ''Storage Market Opportunities'' (SMOs) were chosen for an in-depth evaluation in this phase. The authors conclude that some combination of the Power Cost Volatility and the T&D Benefits SMOs would be the most compelling for further investigation. Specifically, a combination of benefits (energy, capacity, power quality and reliability enhancement) achievable using energy storage systems for high value T&D applications, in regions with high power cost volatility, makes storage very competitive for about 24 GW and 120 GWh during the years of 2001 and 2010.

IANNUCCI, JOE; EYER, JIM; BUTLER, PAUL C.

2003-02-01T23:59:59.000Z

51

Geothermal Program Review VII: proceedings. DOE Research and Development for the Geothermal Marketplace  

DOE Green Energy (OSTI)

Each year the Geothermal Technology Division of the US Department of Energy conducts an indepth review of its entire geothermal R and D program. The 2--3 day conference serves several purposes: a status report on current R and D activities, an assessment of progress and problems, a review of management issues, and a technology transfer opportunity between DOE and the US geothermal industry. This year's conference, Program Review 7, was held in San Francisco on March 21--23, 1989. As indicated by its title, ''DOE Research and Development for the Geothermal Marketplace'', Program Review 7 emphasized developing technologies, concepts, and innovations having potential for commercial application in the foreseeable future. Program Review 7 was comprised of eight sessions including an opening session and a special presentation on the ''Role of Geothermal Energy in Minimizing Global Environmental Problems.'' The five technical sessions covered GTD-sponsored R and D in the areas of hydrothermal (two sessions), hot dry rock, geopressured, and magma. Presentations were made by the relevant field researchers, and sessions were chaired by the appropriate DOE Operations Office Geothermal Program Manager. The technical papers and commentary of invited speakers contained in these Proceedings have been compiled in the order in which they were presented at Program Review 7.

Not Available

1989-01-01T23:59:59.000Z

52

Constraint-based 3D direct manipulations for intuitive and precise solid modelling in a virtual reality environment  

Science Conference Proceedings (OSTI)

The absence of constraints when interacting with virtual objects is one of the major limitations in the current Virtual Reality (VR) environments. Without constraints, it is difficult to perform precise interactive manipulations and precise solid modelling ... Keywords: allowable motions, constraint recognition, constraint solving, constraint-based manipulations, solid modelling, virtual reality

Y. Zhong; W. Müller-Wittig

2002-09-01T23:59:59.000Z

53

Demand-Side and Supply-Side Load Management: Optimizing with Thermal Energy Storage (TES) for the Restructuring Energy Marketplace  

E-Print Network (OSTI)

The current and future restructuring energy marketplace represents a number of challenges and opportunities to maximize value through the management of peak power. This is true both on the demand-side regarding peak power use and on the supply-side regarding power generation. Thermal Energy Storage (TES) can provide the flexibility essential to the economical management of power. In large industrial applications, the added value of TES has been demonstrated, not only in managing operating costs, but also in delivering a net saving in capital cost versus conventional, non-storage approaches. This capital cost saving is often realized in situations where investments in chiller plant capacity, or in on-site power generating capacity, are required. On the demand-side, TES has long been used to shift air-conditioning loads and process cooling loads from on-peak to off-peak periods. In today's and tomorrow's restructuring energy markets, price spikes are increasingly likely during periods of peak power demand. TES is performing an important role, especially when coupled with a proper understanding of modern TES technology options. The inherent advantages and limitations of the available TES technology options are briefly reviewed and discussed. Examples of existing large TES installations are presented, identifying the TES technology types they utilize. The applications include industrial facilities, as well as universities, hospitals, government, and District Cooling utility systems. The power management impact and the economic benefits of TES are illustrated through a review of several TES case studies. Combustion Turbines (CTs) are a common choice for modern on-site and utility power generation facilities. Inlet air cooling of CTs enhances their hot weather performance and has been successfully accomplished for many years, using a variety of technologies. In many instances, TES can and does provide a uniquely advantageous method of optimizing the economics of CT Inlet Cooling (CTIC) systems. TES systems can achieve low inlet air temperatures, with resulting high levels of power augmentation. The TES approach also minimizes the installed capacity (and capital cost) of cooling systems, as well as limiting the parasitic loads occurring during periods of peak power demand and peak power value. Chilled water, ice, and low temperature fluid TES systems are all applicable to CTIC. The inherent pros and cons of each TES type are discussed. Sensitivity analyses are presented to explore the impact of cooling hours per day on capital cost per kW of power enhancement. Case histories illustrate the beneficial impact of TES-based CTIC on both capital cost and operating cost of CT power plants. TES-based CTIC is advantageous as an economical, peaking power enhancement for either peaking or base-load plants. It is applied to both new and existing CTs. TES is projected to have even greater value in future restructuring energy markets.

Andrepont, J. S.

2002-04-01T23:59:59.000Z

54

Constraint and Restoring Force  

E-Print Network (OSTI)

Long-lived sensor network applications must be able to self-repair and adapt to changing demands. We introduce a new approach for doing so: Constraint and Restoring Force. CRF is a physics-inspired framework for computing ...

Beal, Jacob

2007-08-24T23:59:59.000Z

55

REDUCTION OF CONSTRAINTS FOR COUPLED OPERATIONS  

SciTech Connect

The homogeneity constraint was implemented in the Defense Waste Processing Facility (DWPF) Product Composition Control System (PCCS) to help ensure that the current durability models would be applicable to the glass compositions being processed during DWPF operations. While the homogeneity constraint is typically an issue at lower waste loadings (WLs), it may impact the operating windows for DWPF operations, where the glass forming systems may be limited to lower waste loadings based on fissile or heat load limits. In the sludge batch 1b (SB1b) variability study, application of the homogeneity constraint at the measurement acceptability region (MAR) limit eliminated much of the potential operating window for DWPF. As a result, Edwards and Brown developed criteria that allowed DWPF to relax the homogeneity constraint from the MAR to the property acceptance region (PAR) criterion, which opened up the operating window for DWPF operations. These criteria are defined as: (1) use the alumina constraint as currently implemented in PCCS (Al{sub 2}O{sub 3} {ge} 3 wt%) and add a sum of alkali constraint with an upper limit of 19.3 wt% ({Sigma}M{sub 2}O < 19.3 wt%), or (2) adjust the lower limit on the Al{sub 2}O{sub 3} constraint to 4 wt% (Al{sub 2}O{sub 3} {ge} 4 wt%). Herman et al. previously demonstrated that these criteria could be used to replace the homogeneity constraint for future sludge-only batches. The compositional region encompassing coupled operations flowsheets could not be bounded as these flowsheets were unknown at the time. With the initiation of coupled operations at DWPF in 2008, the need to revisit the homogeneity constraint was realized. This constraint was specifically addressed through the variability study for SB5 where it was shown that the homogeneity constraint could be ignored if the alumina and alkali constraints were imposed. Additional benefit could be gained if the homogeneity constraint could be replaced by the Al{sub 2}O{sub 3} and sum of alkali constraint for future coupled operations processing based on projections from Revision 14 of the High Level Waste (HLW) System Plan. As with the first phase of testing for sludge-only operations, replacement of the homogeneity constraint with the alumina and sum of alkali constraints will ensure acceptable product durability over the compositional region evaluated. Although these study glasses only provide limited data in a large compositional region, the approach and results are consistent with previous studies that challenged the homogeneity constraint for sludge-only operations. That is, minimal benefit is gained by imposing the homogeneity constraint if the other PCCS constraints are satisfied. The normalized boron releases of all of the glasses are well below the Environmental Assessment (EA) glass results, regardless of thermal history. Although one of the glasses had a normalized boron release of approximately 10 g/L and was not predictable, the glass is still considered acceptable. This particular glass has a low Al{sub 2}O{sub 3} concentration, which may have attributed to the anomalous behavior. Given that poor durability has been previously observed in other glasses with low Al{sub 2}O{sub 3} and Fe{sub 2}O{sub 3} concentrations, including the sludge-only reduction of constraints study, further investigations appear to be warranted. Based on the results of this study, it is recommended that the homogeneity constraint (in its entirety with the associated low frit/high frit constraints) be eliminated for coupled operations as defined by Revision 14 of the HLW System Plan with up to 2 wt% TiO{sub 2}. The use of the alumina and sum of alkali constraints should be continued along with the variability study to determine the predictability of the current durability models and/or that the glasses are acceptable with respect to durability. The use of a variability study for each batch is consistent with the glass product control program and it will help to assess new streams or compositional changes. It is also recommended that the influence of alumi

Raszewski, F.; Edwards, T.

2009-12-15T23:59:59.000Z

56

From Typing Constraints to Typed Constraint Systems in CHR  

E-Print Network (OSTI)

Typing constraint programs requires the exibility of subtyping to properly express coercions between constraint domains. The typing of constraint logic programs as done in the TCLP system for example involves solving complex subtyping constraints. In this paper we present an implementation in CHR of Pottier's algorithm for checking the satisfiability of subtype inequalities. We show that when combined with a CHR implementation of an untyped constraint system, a simple merge of both CHR programs gives rise to a new typed constraint system which enjoys nice semantical properties. This is illustrated with examples of typed unification and TCLP programs.

Emmanuel Coquery; François Fages; Projet Contraintes Inria-rocquencourt

2001-01-01T23:59:59.000Z

57

Constrainted Coherent States  

E-Print Network (OSTI)

Coherent states possess a regularized path integral and gives a natural relation between classical variables and quantum operators. Recent work by Klauder and Whiting has included extended variables, that can be thought of as gauge fields, into this formalism. In this paper, I consider the next step, and look at the roll of first class constraints.

M. C. Ashworth

1996-04-21T23:59:59.000Z

58

Combined CDF and D0 upper limits on $gg\\to H\\to W^+W^-$ and constraints on the Higgs boson mass in fourth-generation fermion models with up to 8.2 fb$^{-1}$ of data  

Science Conference Proceedings (OSTI)

We combine results from searches by the CDF and D0 Collaborations for a standard model Higgs boson (H) in the processes gg {yields} H {yields} W{sup +}W{sup -} and gg {yields} H {yields} ZZ in p{bar p} collisions at the Fermilab Tevatron Collider at {radical}s = 1.96 TeV. With 8.2 fb{sup -1} of integrated luminosity analyzed at CDF and 8.1 fb{sup -1} at D0, the 95% C.L. upper limit on {sigma}(gg {yields} H) x {Beta}(H {yields} W{sup +}W{sup -}) is 1.01 pb at m{sub H} = 120 GeV, 0.40 pb at m{sub H} = 165 GeV, and 0.47 pb at m{sub H} = 200 GeV. Assuming the presence of a fourth sequential generation of fermions with large masses, we exclude at the 95% Confidence Level a standard-model-like Higgs boson with a mass between 124 and 286 GeV.

Benjamin, Doug; /Tufts U.

2011-08-01T23:59:59.000Z

59

Adaptive Constraints for Feature Tracking  

Science Conference Proceedings (OSTI)

In this paper extensions to an existing tracking algorithm are described. These extensions implement adaptive tracking constraints in the form of regional upper-bound displacements and an adaptive track smoothness constraint. Together, these ...

K. I. Hodges

1999-06-01T23:59:59.000Z

60

Hardness of Maximum Constraint Satisfaction.  

E-Print Network (OSTI)

??We show optimal (up to a constant factor) NP-hardness for maximum constraint satisfaction problem with k variables per constraint (Max-k-CSP), whenever k is larger than… (more)

Chan, Siu On

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "marketplace constraints limit" 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

Constraint Reasoning for Differential Models  

Science Conference Proceedings (OSTI)

The basic motivation of this work was the integration of biophysical models within the interval constraints framework for decision support. Comparing the major features of biophysical models with the expressive power of the existing interval constraints ...

Jorge Cruz

2005-05-01T23:59:59.000Z

62

Solving quantified constraint satisfaction problems  

Science Conference Proceedings (OSTI)

We make a number of contributions to the study of the Quantified Constraint Satisfaction Problem (QCSP). The QCSP is an extension of the constraint satisfaction problem that can be used to model combinatorial problems containing contingency or uncertainty. ... Keywords: Arc consistency, Quantified Boolean formulas, Quantified constraint satisfaction problems, Random problems, Search algorithms

Ian P. Gent; Peter Nightingale; Andrew Rowley; Kostas Stergiou

2008-04-01T23:59:59.000Z

63

B2B e-marketplace adoption in South African agriculture  

Science Conference Proceedings (OSTI)

The Internet has made significant inroads in industrialized, developed countries. However, since developing countries tend to have a limited history of trade, the marginal impact of the Internet on these countries' economies is considerably greater. ...

Eric Cloete; Martin Doens

2008-07-01T23:59:59.000Z

64

Application of Lateral Boundary Condition Perturbations to Help Restore Dispersion in Limited-Area Ensemble Forecasts  

Science Conference Proceedings (OSTI)

In a companion paper, the authors showed that lateral boundary condition (LBC) constraints on small-scale error variance growth are sufficient to limit dispersion in limited-area-model (LAM) ensemble simulations. The error growth constraints ...

Paul Nutter; Ming Xue; David Stensrud

2004-10-01T23:59:59.000Z

65

Tolerance Limits  

Science Conference Proceedings (OSTI)

... LIMITS Y ** *** 2-SIDED NORMAL TOLERANCE LIMITS: XBAR +- K*S REFERENCE--CRC HANDBOOK, PAGES 32-35 ...

2010-12-06T23:59:59.000Z

66

Propagation algorithms for lexicographic ordering constraints  

Science Conference Proceedings (OSTI)

Finite-domain constraint programming has been used with great success to tackle a wide variety of combinatorial problems in industry and academia. To apply finite-domain constraint programming to a problem, it is modelled by a set of constraints on a ... Keywords: artificial intelligence, constraint programming, constraint propagation, constraints, generalized arc consistency, lexicographic ordering, matrix models, symmetry, symmetry breaking

Alan M. Frisch; Brahim Hnich; Zeynep Kiziltan; Ian Miguel; Toby Walsh

2006-07-01T23:59:59.000Z

67

Consequences of intensity constraints on inertial confinement fusion  

SciTech Connect

It is shown that the conflicting requirements of high implosion efficiency (low corona temperature) and adequate energy transport (high corona temperature) can, together with other effects, limit useful infrared light intensities to values on the order of 100 Tw/cm/sup 2/. Increased interest in ultraviolet lasers, for which this intensity constraint is expected to be less severe, and the entry of charged-particle drivers in the inertial confinement fusion (ICF) competition are consequences of this limitation. Analytical results based on a simple model are presented which show how the gain of an ICF target is modified by the existence of an arbitrary intensity constraint.

Kidder, R.E.

1979-09-13T23:59:59.000Z

68

Constraints on hypercomputation  

Science Conference Proceedings (OSTI)

Wegner and Eberbach [16] have argued that there are fundamental limitations to Turing Machines as a foundation of computability and that these can be overcome by so-called superTuring models. In this paper we contest their claims for interaction machines ...

Greg Michaelson; Paul Cockshott

2006-06-01T23:59:59.000Z

69

Closed Crawl Space Performance: Proof of Concept in the Production Builder Marketplace  

Science Conference Proceedings (OSTI)

This overview is intended to be a very concise, limited summary of the key project activities discussed in the detailed report that follows. Due to the large scope of this project, the detailed report is broken into three individually titled sections. Each section repeats key background information, with the goal that the sections will eventually stand alone as complete reports on the major activities of the project. The information presented herein comes from ongoing research, so please note that all observations, findings and recommendations presented are preliminary and subject to change in the future. We invite and welcome your comments and suggestions for improving the project. Advanced Energy completed its first jointly-funded crawl space research project with the Department of Energy in 2005. That project, funded under award number DE-FC26-00NT40995 and titled 'A Field Study Comparison of the Energy and Moisture Performance Characteristics of Ventilated Versus Sealed Crawl Spaces in the South' demonstrated the substantial energy efficiency and moisture management benefits that result from using properly closed crawl space foundations for residential construction instead of traditional wall vented crawl space foundations. Two activities of this first project included (1) an assessment of ten existing homes to document commonly observed energy and moisture failures associated with wall-vented crawl space foundations and (2) a detailed literature review that documented both the history of closed crawl space research and the historical lack of scientific justification for building code requirements for crawl space ventilation. The most valuable activity of the 2005 project proved to be the field demonstration of various closed crawl space techniques, which were implemented in a set of twelve small (1040 square feet), simply designed homes in eastern North Carolina. These homes had matched envelope, mechanical and architectural designs, and comparable performance characteristics with regard to infiltration and duct leakage. Researchers settled on two closed crawl space designs, one with insulation located in the framed floor structure above the crawl space and one with insulation on the crawl space perimeter wall, as the designs with the most widespread potential for application. Researchers based this assessment not only on the field performance, but also on input from residential builders, pest control professionals, code officials, installers, and building scientists active in the region. The key findings from the field demonstration were that (1) closed crawl spaces stay substantially drier than traditional wall-vented crawl spaces during humid climate conditions, and (2) the houses built on the closed crawl space foundations saved, on average, 15% or more on annual energy used for space heating and cooling. A comparison of the actual energy performance of the homes versus the performance predicted by a popular HERS software application showed that the software was unable to predict the demonstrated savings, in some cases predicting an energy penalty. Findings from the 2005 project were summarized in a publication titled Closed Crawl Spaces: An Introduction to Design, Construction and Performance. Since its release, the publication has received widespread use by builders, homeowners, installers and code officials concerned about crawl space construction. The findings were also used to create major revisions to the NC Residential Code, which were adopted in 2004 and immediately began to reduce the regulatory barriers to widespread commercialization of the technology in NC, particularly in new residential construction. Full project details are located at www.crawlspaces.org.

Malkin-Weber, Melissa; Dastur, Cyrus; Mauceri, Maria; Hannas, Benjamin

2008-10-30T23:59:59.000Z

70

DOE Hydrogen Analysis Repository: Coal Distribution Constraints  

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

Coal Distribution Constraints Project Summary Full Title: Future Impacts of Coal Distribution Constraints on Coal Cost Project ID: 199 Principal Investigator: David McCollum...

71

Press Pass - Press Release - Higgs mass constraints  

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

-constraints-20100726-images.html Fermilab experiments narrow allowed mass range for Higgs boson Batavia, Ill.New constraints on the elusive Higgs particle are more stringent...

72

Gradience, constructions and constraint systems  

Science Conference Proceedings (OSTI)

This paper is concerned with the question of quantifying gradient degrees of acceptability by introducing the notion of Density in the context of constructional constraint language processing. We first present here our framework for language processing, ...

Philippe Blache; Jean-Philippe Prost

2004-09-01T23:59:59.000Z

73

Large Scale Structure Forecast Constraints on Particle Production During Inflation  

E-Print Network (OSTI)

Bursts of particle production during inflation provide a well-motivated mechanism for creating bump like features in the primordial power spectrum. Current data constrains these features to be less than about 5% the size of the featureless primordial power spectrum at wavenumbers of about 0.1 h Mpc^{-1}. We forecast that the Planck cosmic microwave background experiment will be able to strengthen this constraint to the 0.5% level. We also predict that adding data from a square kilometer array (SKA) galaxy redshift survey would improve the constraint to about the 0.1% level. For features at larger wave-numbers, Planck will be limited by Silk damping and foregrounds. While, SKA will be limited by non-linear effects. We forecast for a Cosmic Inflation Probe (CIP) galaxy redshift survey, similar constraints can be achieved up to about a wavenumber of 1 h Mpc^{-1}.

Teeraparb Chantavat; Christopher Gordon; Joseph Silk

2010-09-29T23:59:59.000Z

74

Large scale structure forecast constraints on particle production during inflation  

SciTech Connect

Bursts of particle production during inflation provide a well-motivated mechanism for creating bumplike features in the primordial power spectrum. Current data constrain these features to be less than about 5% the size of the featureless primordial power spectrum at wave numbers of about 0.1h Mpc{sup -1}. We forecast that the Planck cosmic microwave background experiment will be able to strengthen this constraint to the 0.5% level. We also predict that adding data from a square kilometer array galaxy redshift survey would improve the constraint to about the 0.1% level. For features at larger wave numbers, Planck will be limited by Silk damping and foregrounds, while the square kilometer array will be limited by nonlinear effects. We forecast, for a cosmic inflation probe galaxy redshift survey, that similar constraints can be achieved up to about a wave number of 1.0h Mpc{sup -1}.

Chantavat, Teeraparb; Gordon, Christopher; Silk, Joseph [Oxford Astrophysics, Denys Wilkinson Building, Keble Road, Oxford, OX1 3RH (United Kingdom)

2011-05-15T23:59:59.000Z

75

Constraint-based animation: temporal constraints in the Animus systems  

SciTech Connect

Algorithm animation has a growing role in computer-aided algorithm design documentation and debugging, since interactive graphics is a richer channel than text for communication. Most animation is currently done laboriously by hand, and it often has the character of canned demonstrations with restricted user interaction. Animus is a system that allows easy construction of an animation with minimal concern for lower-level graphics programming. Constraints are used to describe the appearance and structure of a picture as well as how those pictures evolve in time. The implementation and support of temporal constraints is a substantive extension to previous constraint languages which had only allowed specification of static state. Use of the Animus system is demonstrated in the creation of animations of dynamic mechanical and electrical-circuit simulations, sorting algorithms, problems in operating systems, and geometric curve-drawing algorithms.

Duisberg, R.A.

1986-01-01T23:59:59.000Z

76

An automaton Constraint for Local Search  

Science Conference Proceedings (OSTI)

We explore the idea of using automata to implement new constraints for local search. This is already a successful approach in constraint-based global search. We show how to maintain the violations of a constraint and its variables via a deterministic ... Keywords: Automaton constraint, Counter automaton, Local search

Jun He; Pierre Flener; Justin Pearson

2011-04-01T23:59:59.000Z

77

Solar system constraints on R$^n$ gravity  

E-Print Network (OSTI)

Recently, gravitational microlensing has been investigated in the framework of the weak field limit of fourth order gravity theory. However, solar system data (i.e. planetary periods and light bending) can be used to put strong constraints on the parameters of this class of gravity theories. We find that these parameters must be very close to those corresponding to the Newtonian limit of the theory.

A. F. Zakharov; A. A. Nucita; F. De Paolis; G. Ingrosso

2006-11-02T23:59:59.000Z

78

Innovative Feed-In Tariff Designs that Limit Policy Costs  

Science Conference Proceedings (OSTI)

Feed-in tariffs (FITs) are the most prevalent renewable energy policy used globally to date, and there are many benefits to the certainty offered in the marketplace to reduce development risks and associated financing costs and to grow the renewable energy industry. However, concerns over escalating costs in jurisdictions with FIT policies have led to increased attention on cost control in renewable energy policy design. In recent years, policy mechanisms for containing FIT costs have become more refined, allowing policymakers to exert greater control on policy outcomes and on the resulting costs to ratepayers. As policymakers and regulators in the United States begin to explore the use of FITs, careful consideration must be given to the ways in which policy design can be used to balance the policies' advantages while bounding its costs. This report explores mechanisms that policymakers have implemented to limit FIT policy costs. If designed clearly and transparently, such mechanisms can align policymaker and market expectations for project deployment. Three different policy tools are evaluated: (1) caps, (2) payment level adjustment mechanisms, and (3) auction-based designs. The report employs case studies to explore the strengths and weaknesses of these three cost containment tools. These tools are then evaluated with a set of criteria including predictability for policymakers and the marketplace and the potential for unintended consequences.

Kreycik, C.; Couture, T. D.; Cory, K. S.

2011-06-01T23:59:59.000Z

79

Innovative applications of energy storage in a restructured electricity marketplace : Phase III final report : a study for the DOE Energy Storage Systems Program.  

DOE Green Energy (OSTI)

This report describes Phase III of a project entitled Innovative Applications of Energy Storage in a Restructured Electricity Marketplace. For this study, the authors assumed that it is feasible to operate an energy storage plant simultaneously for two primary applications: (1) energy arbitrage, i.e., buy-low-sell-high, and (2) to reduce peak loads in utility ''hot spots'' such that the utility can defer their need to upgrade transmission and distribution (T&D) equipment. The benefits from the arbitrage plus T&D deferral applications were estimated for five cases based on the specific requirements of two large utilities operating in the Eastern U.S. A number of parameters were estimated for the storage plant ratings required to serve the combined application: power output (capacity) and energy discharge duration (energy storage). In addition to estimating the various financial expenditures and the value of electricity that could be realized in the marketplace, technical characteristics required for grid-connected distributed energy storage used for capacity deferral were also explored.

Eyer, James M. (Distributed Utility Associates, Livermore, CA); Erdman, Bill (Distributed Utility Associates, Livermore, CA); Iannucci, Joseph J., Jr. (, . Distributed Utility Associates, Livermore, CA)

2005-03-01T23:59:59.000Z

80

Magnetic vortices for a Ginzburg-Landau type energy with discontinuous constraint. II  

E-Print Network (OSTI)

We study vortex nucleation for minimizers of a Ginzburg-Landau energy with discontinuous constraint. For applied magnetic fields comparable with the first critical field of vortex nucleation, we determine the limiting vorticities.

Hassen Aydi; Ayman Kachmar

2008-07-08T23:59:59.000Z

Note: This page contains sample records for the topic "marketplace constraints limit" 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

Angular constraint on light-trapping absorption enhancement in solar cells  

E-Print Network (OSTI)

Light trapping for solar cells can reduce production cost and improve energy conversion efficiency. Understanding some of the basic theoretical constraints on light trapping is therefore of fundamental importance. Here, we develop a general angular constraint on the absorption enhancement in light trapping. We show that there is an upper limit for the angular integration of absorption enhancement factors. This limit is determined by the number of accessible resonances supported by an absorber.

Yu, Zongfu

2010-01-01T23:59:59.000Z

82

New Constraints on the Early Expansion History  

E-Print Network (OSTI)

Cosmic microwave background measurements have pushed to higher resolution, lower noise, and more sky coverage. These data enable a unique test of the early universe's expansion rate and constituents such as effective number of relativistic degrees of freedom and dark energy. Using the most recent data from Planck and WMAP9, we constrain the expansion history in a model independent manner from today back to redshift z=10^5. The Hubble parameter is mapped to a few percent precision, limiting early dark energy and extra relativistic degrees of freedom within a model independent approach to 2-16% and 0.71 equivalent neutrino species respectively (95% CL). Within dark radiation, barotropic aether, and Doran-Robbers models, the early dark energy constraints are 3.3%, 1.9%, 1.2% respectively.

Hojjati, Alireza; Samsing, Johan

2013-01-01T23:59:59.000Z

83

Evolving parameterised policies for stochastic constraint programming  

Science Conference Proceedings (OSTI)

Stochastic Constraint Programming is an extension of Constraint Programming for modelling and solving combinatorial problems involving uncertainty. A solution to such a problem is a policy tree that specifies decision variable assignments in each scenario. ...

Steven Prestwich; S. Armagan Tarim; Roberto Rossi; Brahim Hnich

2009-09-01T23:59:59.000Z

84

Critical Operating Constraint Forecasting (COCF)  

Science Conference Proceedings (OSTI)

This document represents the progress report and Task 1 letter report of the California Institute for Energy and Environment (CIEE) contract funded by the California Energy Commission (CEC), Critical Operating Constraint Forecasting (COCF) for California Independent System Operator (CAISO) Planning Phase. Task 1 was to accomplish the following items: Collect data from CAISO to set up the WECC power flow base case representing the CAISO system in the summer of 2006 Run TRACE for maximizing California Impo...

2006-06-30T23:59:59.000Z

85

Selfish routing in the presence of side constraints  

E-Print Network (OSTI)

technological nature, e.g., capacity or budgetary constraints. .... the Lagrangean multipliers of capacity constraints. ..... We define the continuous mapping ?.

86

Resource Constraints for Preemptive Job-shop Scheduling  

Science Conference Proceedings (OSTI)

This paper presents an experimental study of constraint propagation algorithms for preemptive scheduling. We propose generalizations of non-preemptive constraint propagation techniques (based on timetables, on disjunctive constraints, and on edge-finding) ... Keywords: constraint propagation, disjunctive constraints, edge-finding, job-shop scheduling, network flows, preemptive scheduling, resource constraints, timetables

Claude Le Pape; Philippe Baptiste

1998-10-01T23:59:59.000Z

87

Press Pass - Press Release - Higgs mass constraints  

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

imagesHiggs-mass-constraints-Aug2008.html Tevatron Experiments Double-Team Higgs Boson Joint CDF, DZero effort lands Fermilab in Higgs territory Batavia, Ill.--Scientists...

88

Constraints on Area Variables in Regge Calculus  

E-Print Network (OSTI)

We describe a general method of obtaining the constraints between area variables in one approach to area Regge calculus, and illustrate it with a simple example. The simplicial complex is the simplest tessellation of the 4-sphere. The number of independent constraints on the variations of the triangle areas is shown to equal the difference between the numbers of triangles and edges, and a general method of choosing independent constraints is described. The constraints chosen by using our method are shown to imply the Regge equations of motion in our example.

Jarmo Makela; Ruth M. Williams

2000-11-02T23:59:59.000Z

89

Constraints on Area Variables in Regge Calculus  

E-Print Network (OSTI)

We describe a general method of obtaining the constraints between area variables in one approach to area Regge calculus, and illustrate it with a simple example. The simplicial complex is the simplest tessellation of the 4-sphere. The number of independent constraints on the variations of the triangle areas is shown to equal the difference between the numbers of triangles and edges, and a general method of choosing independent constraints is described. The constraints chosen by using our method are shown to imply the Regge equations of motion in our example.

Mäkelä, J M; Makela, Jarmo; Williams, Ruth M.

2001-01-01T23:59:59.000Z

90

Exploiting succinct constraints using FP-trees  

Science Conference Proceedings (OSTI)

Since its introduction, frequent-set mining has been generalized to many forms, which include constrained data mining. The use of constraints permits user focus and guidance, enables user exploration and control, and leads to effective pruning ... Keywords: FP-trees, constraints, data mining, frequent sets, succinctness

Carson Kai-Sang Leung; Laks V. S. Lakshmanan; Raymond T. Ng

2002-06-01T23:59:59.000Z

91

Constraint Handling in Particle Swarm Optimization  

Science Conference Proceedings (OSTI)

In this article, the authors propose a particle swarm optimization PSO for constrained optimization. The proposed PSO adopts a multiobjective approach to constraint handling. Procedures to update the feasible and infeasible personal best are designed ... Keywords: Constrained Optimization, Constraint Handling, Feasible Personal Best, Infeasible Personal Best, Multiobjective Optimization, Particle Swarm Optimization

Wen Fung Leong; Gary G. Yen

2010-01-01T23:59:59.000Z

92

Modeling reducibility on ground terms using constraints  

E-Print Network (OSTI)

Modeling reducibility on ground terms using constraints Isabelle GNAEDIGa , H´el`ene KIRCHNERb a on ground terms using (dis)equational constraints. We show in particular that innermost (ir)reducibility can on the ground term algebra that any rewriting chain starting from any term termi- nates, provided that terms

Paris-Sud XI, Université de

93

Office of Inspector General audit report on ``The U.S. Department of Energy`s X-Change 1997: The global D and D marketplace conference``  

SciTech Connect

The Department of Energy and Florida International University (FIU), a state university, cosponsored the X-Change 1997: The Global D and D Marketplace conference (X-Change Conference) that was held December 1--5, 1997, in Miami, Florida. The purpose of the conference was to disseminate information on decontamination and decommissioning problems, solutions, and technologies to an international audience of government, industry, and academia. Through a contract with the Department, FIU was responsible for conference planning, organization, and logistical support. FIU awarded a subcontract to ICF, Inc. to work on the conference. ICF, Inc. is a major Department contractor with responsibilities for projects at Hanford, Argonne National laboratory and Los Alamos National Laboratory. The audit objectives were to determine whether FIU had controls in place to ensure that public funds were used appropriately, and whether fiscal practices associated with the conference were consistent with Government requirements and Department policy. FIU implemented accounting and budget mechanisms to identify and control the sources and uses of funds. However, the absence of a Departmental policy on funding conferences resulted in questionable fiscal practices associated with the conference. These are discussed.

1998-10-01T23:59:59.000Z

94

Solving connected row convex constraints by variable elimination  

Science Conference Proceedings (OSTI)

We propose an algorithm for the class of connected row convex constraints. In this algorithm, we introduce a novel variable elimination method to solve the constraints. This method is simple and able to make use of the sparsity of the problem instances. ... Keywords: Connected row convex constraints, Constraint composition, Constraint satisfaction problems, Path consistency, Variable elimination

Yuanlin Zhang; Satyanarayana Marisetti

2009-08-01T23:59:59.000Z

95

Modulation Optimization under Energy Constraints  

E-Print Network (OSTI)

We consider radio applications where the nodes operate on batteries so that energy consumption must be minimized while satisfying given throughput and delay requirements. In this context, we analyze the best modulation strategy to minimize the total energy consumption required to send a given number of bits. The total energy consumption includes both the transmission energy and the circuit energy consumption. We show that for both MQAM and MFSK the transmission energy decreases with the product while the circuit energy consumption increases with , where is the modulation bandwidth and the transmission time. Thus, in short-range applications where the circuit energy consumption is nonnegligible compared with the transmission energy, the total energy consumption is minimized by using the maximum system bandwidth along with an optimized transmission time . We derive this optimal for MQAM and MFSK modulation in both AWGN channels and Rayleigh fading channels. Our optimization considers both delay and peak-power constraints. Numerical examples are given, where we exhibit up to 2 energy savings over modulation strategies that minimize the transmission energy alone.

Shuguang Cui Andrea; Andrea J. Goldsmith; Ahmad Bahai

2003-01-01T23:59:59.000Z

96

Optimal Stopping with Information Constraint  

SciTech Connect

We study the optimal stopping problem proposed by Dupuis and Wang (Adv. Appl. Probab. 34:141-157, 2002). In this maximization problem of the expected present value of the exercise payoff, the underlying dynamics follow a linear diffusion. The decision maker is not allowed to stop at any time she chooses but rather on the jump times of an independent Poisson process. Dupuis and Wang (Adv. Appl. Probab. 34:141-157, 2002), solve this problem in the case where the underlying is a geometric Brownian motion and the payoff function is of American call option type. In the current study, we propose a mild set of conditions (covering the setup of Dupuis and Wang in Adv. Appl. Probab. 34:141-157, 2002) on both the underlying and the payoff and build and use a Markovian apparatus based on the Bellman principle of optimality to solve the problem under these conditions. We also discuss the interpretation of this model as optimal timing of an irreversible investment decision under an exogenous information constraint.

Lempa, Jukka, E-mail: jlempa@cma.uio.no [University of Oslo, Centre of Mathematics for Applications (Norway)

2012-10-15T23:59:59.000Z

97

Analysis of Energy Efficiency in Fading Channels under QoS Constraints  

E-Print Network (OSTI)

Energy efficiency in fading channels in the presence of Quality of Service (QoS) constraints is studied. Effective capacity, which provides the maximum arrival rate that a wireless channel can sustain while satisfying statistical QoS constraints, is considered. Spectral efficiency--bit energy tradeoff is analyzed in the low-power and wideband regimes by employing the effective capacity formulation, rather than the Shannon capacity. Through this analysis, energy requirements under QoS constraints are identified. The analysis is conducted under two assumptions: perfect channel side information (CSI) available only at the receiver and perfect CSI available at both the receiver and transmitter. In particular, it is shown in the low-power regime that the minimum bit energy required under QoS constraints is the same as that attained when there are no such limitations. However, this performance is achieved as the transmitted power vanishes. Through the wideband slope analysis, the increased energy requirements at lo...

Gursoy, Mustafa Cenk; Velipasalar, Senem

2008-01-01T23:59:59.000Z

98

Methodology for identifying materials constraints to implementation of solar energy technologies  

DOE Green Energy (OSTI)

A materials assessment methodology for identifying specific critical material requirements that could hinder the implementation of solar energy has been developed and demonstrated. The methodology involves an initial screening process, followed by a more detailed materials assessment. The detailed assessment considers such materials concerns and constraints as: process and production constraints, reserve and resource limitations, lack of alternative supply sources, geopolitical problems, environmental and energy concerns, time constraints, and economic constraints. Data for 55 bulk and 53 raw materials are currently available on the data base. These materials are required in the example photovoltaic systems. One photovoltaic system and thirteen photovoltaic cells, ten solar heating and cooling systems, and two agricultural and industrial process heat systems have been characterized to define their engineering and bulk material requirements.

Litchfield, J.W.; Watts, R.L.; Gurwell, W.E.; Hartley, J.N.; Bloomster, C.H.

1978-07-01T23:59:59.000Z

99

Hidden Higgs Scenarios: new constraints and prospects at the LHC  

E-Print Network (OSTI)

We review the motivation for hidden Higgs scenarios and discuss the light CP odd Higgs scenario in the NMSSM as an example. We summarize experimental constraints including recent limits from BaBar and Aleph. The main part of the talk is the discussion of dominant decay modes of the standard model like Higgs boson, and related decay modes of the charged Higgs and heavy CP even Higgs bosons, in these scenarios with the focus on signatures and prospects for the LHC. Examples include the direct production of a light CP odd Higgs boson, and a light charged Higgs boson in top quark decays.

Radovan Dermisek

2010-08-02T23:59:59.000Z

100

Integral Transforms in Relativistic Quantum Constraint Mechanics  

E-Print Network (OSTI)

In relativistic quantum constraint mechanics the state of a physical system is constrained to a 3-dimensional subspace of Minkowski 4-space. Fourier transformation can be used to relate this state between constraint spaces in 4-position and 4-momentum space. It is shown that integral transforms of this nature can be carried out using Lorentz-invariant 3-dimensional constraint space coordinates such that a complete equivalence class of 4-space representations can be constructed from the transform. This method is further applied to develop a relativistic generalization of the Segal-Bargmann transformation that leads to the representation of quantum systems in a three-dimensional subspace of Bargmann 4-space.

Robert J. Ducharme

2011-01-29T23:59:59.000Z

Note: This page contains sample records for the topic "marketplace constraints limit" 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

Quantum Metrology Subject to Instrumentation Constraints  

E-Print Network (OSTI)

Maximizing the precision in estimating parameters in a quantum system subject to instrumentation constraints is cast as a convex optimization problem. We account for prior knowledge about the parameter range by developing a worst-case and average case objective for optimizing the precision. Focusing on the single parameter case, we show that the optimization problems are {\\em linear programs}. For the average case the solution to the linear program can be expressed analytically and involves a simple search: finding the largest element in a list. An example is presented which compares what is possible under constraints against the ideal with no constraints, the Quantum Fisher Information.

Robert L. Kosut

2008-03-29T23:59:59.000Z

102

Possible Upper limits on Lorentz Factors in High Energy Astrophysical Processes  

E-Print Network (OSTI)

Gamma ray bursts (GRBs) are the most luminous physical phenomena in the universe. The relativistic effect on the blast wave associated with the GRB introduces the gamma factor. Here we put an upper limit on the gamma factor via constraints on maximal power allowed by general relativity and hence set upper limits on other observable quantities such as deceleration distance. Also upper limits are set on the high energy particle radiation due to constraints set by cosmic microwave background radiation.

C. Sivaram; Kenath Arun

2010-08-31T23:59:59.000Z

103

Modeling and Measurement Constraints in Fault Diagnostics for...  

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

Modeling and Measurement Constraints in Fault Diagnostics for HVAC Systems Title Modeling and Measurement Constraints in Fault Diagnostics for HVAC Systems Publication Type Journal...

104

Understanding the Effects of Compression and Constraint on Water...  

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

Understanding the Effects of Compression and Constraint on Water Uptake of Fuel-Cell Membranes Title Understanding the Effects of Compression and Constraint on Water Uptake of...

105

Constraint-based simulation of adhesive contact  

Science Conference Proceedings (OSTI)

Dynamics with contact are often formulated as a constrained optimization problem. This approach allows handling in an integrated manner both non-penetration and frictional constraints. Following developments in the computational mechanics field, we have ...

Jorge Gascón; Javier S. Zurdo; Miguel A. Otaduy

2010-07-01T23:59:59.000Z

106

CORAL: solving complex constraints for symbolic pathfinder  

Science Conference Proceedings (OSTI)

Symbolic execution is a powerful automated technique for generating test cases. Its goal is to achieve high coverage of software. One major obstacle in adopting the technique in practice is its inability to handle complex mathematical constraints. To ...

Matheus Souza; Mateus Borges; Marcelo d'Amorim; Corina S. P?s?reanu

2011-04-01T23:59:59.000Z

107

Nogood Recording for Valued Constraint Satisfaction Problems  

Science Conference Proceedings (OSTI)

In the frame of classical Constraint Satisfaction Problems (CSPs), the backtrack tree search, combined with learning methods, presents a double advantage: for static solving, it improves the search speed by avoiding redundant explorations; for dynamic ...

P. Dago; G. Verfailllie

1996-11-01T23:59:59.000Z

108

A System for Tabled Constraint Logic Programming  

Science Conference Proceedings (OSTI)

As extensions to traditional logic programming, both tabling and Constraint Logic Programming (CLP) have proven powerful tools in many areas. They make logic programming more efficient and more declarative. However, combining the techniques of tabling ...

Baoqiu Cui; David Scott Warren

2000-07-01T23:59:59.000Z

109

Process Limits on Euclid  

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

Process Limits Process Limits Limit Hard Soft core file size (blocks) 0 unlimited data seg size (kbytes) unlimited unlimited scheduling priority 0 0 file size (blocks) unlimited...

110

A Constraint-Based Approach to Assigning System Components to Tasks  

Science Conference Proceedings (OSTI)

In multi-component systems, individual components must be assigned to the tasks that they are to perform. In many applications, there are several possible task decompositions that could be used to achieve the task, and there are limited resources ... Keywords: autonomous underwater vehicles, constrained heuristic search, constraint satisfaction, task assignment

Elise H. Turner; Roy M. Turner

1999-03-01T23:59:59.000Z

111

Tier-Based Underwater Acoustic Routing for Applications with Reliability and Delay Constraints  

E-Print Network (OSTI)

Tier-Based Underwater Acoustic Routing for Applications with Reliability and Delay Constraints Li for underwater sensor networks is still an open research problem because of the unique charac- teristics of the underwater acoustic communication channel such as limited bandwidth, high and variable propagation delays

Melodia, Tommaso

112

XML Representation of Constraint Networks: Format XCSP 2.1  

E-Print Network (OSTI)

We propose a new extended format to represent constraint networks using XML. This format allows us to represent constraints defined either in extension or in intension. It also allows us to reference global constraints. Any instance of the problems CSP (Constraint Satisfaction Problem), QCSP (Quantified CSP) and WCSP (Weighted CSP) can be represented using this format.

Roussel, Olivier

2009-01-01T23:59:59.000Z

113

Sidelobe Suppression for Robust Beamformer Via the Mixed Norm Constraint  

Science Conference Proceedings (OSTI)

Applying a sparse constraint on the beam pattern has been suggested to suppress the sidelobe of the minimum variance distortionless response (MVDR) beamformer recently. To further improve the performance, we add a mixed norm constraint on the beam pattern. ... Keywords: Mixed norm constraint, Robust beamforming, Sidelobe suppression, Sparse constraint

Yipeng Liu; Qun Wan

2012-08-01T23:59:59.000Z

114

Constraints on the commercialization of oil shale  

DOE Green Energy (OSTI)

The problems and prospects for the commercialization of oil shale from surface retorting are examined. Commercialization refers to the process of private sector adoption of a technology for general use after most of the technological uncertainties have been resolved. Three categories of constraints and uncertainties can be identified: technical constraints relating to the performance characteristics of the technology; economic constraints on the ability of the technology to yield an acceptable rate of return to investors; and institutional constraints that arise from the organizational and political context in which commercialization takes place. Because surface retorting involves relatively well understood technologies, this study deals almost exclusively with economic and institutional constraints. At the present time, a government commercialization effort for oil shale surface retorting would not be likely to result in a viable industry in this century. Alternative oil shale technologies such as modified in situ processes offer prospects of lower shale oil costs, but are less well developed. Data on modified in situ processes are not abundant enough as yet to permit serious estimates of commercial-scale costs. Consequently, government decisions regarding the commercialization of modified in situ technologies should await the completion of further technical tests and an independent definitive plant design.

Merrow, E.W.

1978-09-01T23:59:59.000Z

115

A marketplace for cloud resources  

Science Conference Proceedings (OSTI)

Cloud computing is an emerging paradigm aimed to offer users pay-per-use computing resources, while leaving the burden of managing the computing infrastructure to the cloud provider. We present a new programming and pricing model that gives the cloud ... Keywords: cloud computing, iaas, large-scale scheduling, pricing models, worst-case execution time

Thomas A. Henzinger; Anmol V. Singh; Vasu Singh; Thomas Wies; Damien Zufferey

2010-10-01T23:59:59.000Z

116

Closure of the algebra of constraints for a nonprojectable Horava model  

Science Conference Proceedings (OSTI)

We perform the Hamiltonian analysis for a nonprojectable Horava model whose potential is composed of R and R{sup 2} terms. We show that Dirac's algorithm for the preservation of the constraints can be done in a closed way, hence the algebra of constraints for this model is consistent. The model has an extra, odd, scalar mode whose decoupling limit can be seen in a linear-order perturbative analysis on weakly varying backgrounds. Although our results for this model point in favor of the consistency of the Horava theory, the validity of the full nonprojectable theory still remains unanswered.

Bellorin, Jorge [Departamento de Fisica, Universidad Simon Bolivar, Valle de Sartenejas, 1080-A Caracas (Venezuela, Bolivarian Republic of); Restuccia, Alvaro

2011-02-15T23:59:59.000Z

117

First Constraints on Rings in the Pluto System  

E-Print Network (OSTI)

Simple theoretical calculations have suggested that small body impacts onto Pluto's newly discovered small satellites, Nix and Hydra, are capable of generating time-variable rings or dust sheets in the Pluto system. Using HST/ACS data obtained on 2006 February 15 and 2006 March 2, we find no observational evidence for such a ring system and present the first constraints on the present-day I/F and optical depth of a putative ring system. At the 1500-km radial resolution of our search, we place a 3-sigma upper limit on the azimuthally-averaged normal I/F of ring particles of 5.1x10^-7 at a distance of 42,000 km from the Pluto-Charon barycenter, the minimum distance for a dynamically stable ring (Stern et al., 1994; Nagy et al., 2006); 4.4x10^-7 at the orbit of Nix; and 2.5x10^-7 at the orbit of Hydra. For an assumed ring particle albedo of 0.04 (0.38), these I/F limits translate into 3-sigma upper limits on the normal optical depth of macroscopic ring particles of 1.3x10^-5 (1.4x10^-6), 1.1x10^-5 (1.2x10^-6), 6.4x10^-6 (6.7x10^-7), respectively. Were the New Horizons spacecraft to fly through a ring system with optical depth of 1.3x10^-5, it would collide with a significant number of potentially damaging ring particles. We therefore recommend that unless tighter constraints can be obtained, New Horizons cross the putative ring plane within 42,000 km of the Pluto-Charon barycenter, where rings are dynamically unstable. We derive a crude estimate of the lifetime of putative ring paritcles of 900 years.

A. J. Steffl; S. A. Stern

2006-08-01T23:59:59.000Z

118

Thermal and Structural Constraints on the Tectonic Evolution of the Idaho-Wyoming-Utah Thrust Belt  

E-Print Network (OSTI)

The timing of motion on thrust faults in the Idaho-Wyoming-Utah (IWU) thrust belt comes from synorogenic sediments, apatite thermochronology and direct dating of fault rocks coupled with good geometrical constraints of the subsurface structure. The thermal history comes from the analyses of apatite thermochronology, thermal maturation of hydrocarbon source rocks and isotope analysis of fluid inclusions from syntectonic veins. New information from zircon fission track and zircon (U-Th)/He analysis provide constraints on the thermal evolution of the IWU thrust belt over geological time. These analyses demonstrate that the time-temperature pathway of the rocks sampled never reached the required conditions to reset the thermochronometers necessary to provide new timing constraints. Previous thermal constraints for maximum temperatures of IWU thrust belt rocks, place the lower limit at ~110°C and the upper limit at ~328°C. New zircon fission track results suggest an upper limit at ~180°C for million year time scales. ID-TIMS and LA-ICPMS of syntectonic calcite veins suggest that new techniques for dating times of active deformation are viable given that radiogenic isotope concentrations occur at sufficient levels within the vein material.

Chapman, Shay Michael

2013-08-01T23:59:59.000Z

119

Performance limits of heliostat fields  

SciTech Connect

Geometric and thermodynamic arguments are used to derive upper limits on the performance of a solar energy collection system, consisting of an axisymmetric heliostat field, a solar tower, secondary optics and a black receiver. Performance limits on collected power, concentration, and work output are presented. Performance of tower systems with several secondary optics options is compared: tower-top Compound Parabolic Concentrator (CPC), Tailored Edge-Ray Concentrator (TERC) approximated by a cone, and Cassegrainian with ground-level CPC or Compound Elliptic Concentrator (CEC). Optimized ray tracing is used to generate the design parameters of the secondary concentrators that yield the highest optical efficiency. The results show that the tower-top Cone provides the best performance regarding both concentration and efficiency, except for very large fields. The Cassegrainian designs come in second, but become equal and even better than the Cone for large fields. The results for the Cassegrainian are sensitive to the value of the reflectivity, due to the additional reflections incurred. The choice of a CEC is better than a CPC for the terminal concentration in a Cassegrainian system, but the difference is small. The suitability of the different design options for high-temperature solar applications is discussed. The recommendations regarding optical configuration depend on field size, as well as on application-specific constraints.

Kribus, A.; Krupkin, V.; Yogev, A. [Weizmann Inst. of Science, Rehovot (Israel). Environmental Sciences and Energy Research Dept.; Spirkl, W. [Ludwig-Maximilians-Univ. Muenchen (Germany). Sektion Physik

1998-11-01T23:59:59.000Z

120

Catalog segmentation with double constraints in business  

Science Conference Proceedings (OSTI)

Catalog segmentation is an important issue in data mining in business from the microeconomic point of view. In catalog segmentation, an enterprise tries to develop k catalogs with r products that are sent to corresponding customers in order to maximize ... Keywords: Catalog segmentation, Customer-oriented, DCCSP, Profit constraint

Xiujuan Xu; Yu Liu; Zhe Wang; Chunguang Zhou; Yanchun Liang

2009-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "marketplace constraints limit" 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

Observational Constraints on Open Inflation Models  

E-Print Network (OSTI)

We discuss observational constraints on models of open inflation. Current data from large-scale structure and the cosmic microwave background prefer models with blue spectra and/or Omega_0 >= 0.3--0.5. Models with minimal anisotropy at large angles are strongly preferred.

Martin White; Joe Silk

1996-08-27T23:59:59.000Z

122

Scheduling under Precedence, Communication, and Energy Constraints  

E-Print Network (OSTI)

We consider the problem of scheduling a set of $n$ tasks on $m$ processors under precedence, communication, and global system energy constraints to minimize makespan. We extend existing scheduling models to account for energy usage and give convex programming algorithms that yield essentially the same results as existing algorithms that do not consider energy, while adhering to a strict energy bound.

Felber, David

2011-01-01T23:59:59.000Z

123

Constraint capture and maintenance in engineering design  

Science Conference Proceedings (OSTI)

The Designers' Workbench is a system developed by the Advanced Knowledge Technologies Consortium to support designers in large organizations, such as Rolls-Royce, to ensure that the design is consistent with the specification for the particular design ... Keywords: Application Conditions, Capture, Constraints, Design, Maintenance, Rationales

Suraj Ajit; Derek Sleeman; David w. Fowler; David Knott

2008-11-01T23:59:59.000Z

124

Constraints on quintessence and new physics from fundamental constant  

E-Print Network (OSTI)

Changes in the values of the fundamental constants mu, the proton to electron mass ratio, and alpha, the fine structure constant due to rolling scalar fields have been discussed both in the context of cosmology and in new physics such as Super Symmetry (SUSY) models. This article examines the changes in these fundamental constants in a particular example of such fields, freezing and thawing slow roll quintessence. Constraints are placed on the product of a cosmological quantity, w, the equation of state parameter, and the square of the coupling constants for mu and alpha with the field, zeta_x, x = mu,alpha, using the existing observational limits on the values of Delta x/x. Various examples of slow rolling quintessence models are used to further quantify the constraints. Some of the examples appear to be rejected by the existing data which strongly suggests that conformation to the values of the fundamental constants in the early universe is a standard test that should be applied to any cosmological model or suggested new physics.

Rodger I. Thompson

2012-02-17T23:59:59.000Z

125

Electroweak limits on physics beyond the Standard Model  

E-Print Network (OSTI)

We briefly review the global Standard Model fit to electroweak precision data, and discuss the status of electroweak constraints on new interactions. We follow a general effective Lagrangian approach to obtain model-independent limits on the dimension-six operators, as well as on several common new physics extensions.

de Blas, J

2013-01-01T23:59:59.000Z

126

The impact of energy constraints on the medium access  

E-Print Network (OSTI)

Contemporary mobile devices are battery powered and due to their shrinking size and increasing complexity operate on a tight energy budget. Thus, energy consumption is becoming one of the major concerns regarding the current and upcoming wireless communication systems. On the other hand, the available bandwidth resources are limited and modern applications are throughput demanding, leading thus to strong competition for the medium. In this direction, we consider a stochastic contention based medium access scheme, where the devices may choose to turn off for some time in order to save energy. We perform an analysis for a slotted ALOHA scenario and we show that the energy constraints, if properly exploited, may reduce contention for the medium. Our results give valuable insights on the energy--throughput tradeoff for any contention based system.

Gkatzikis, Lazaros; Koutsopoulos, Iordanis

2011-01-01T23:59:59.000Z

127

Parallel execution of multi-set constraint rewrite rules  

Science Conference Proceedings (OSTI)

Multi-set constraint rewriting allows for a highly parallel computational model and has been used in a multitude of application domains such as constraint solving, agent specification etc. Rewriting steps can be applied simultaneously as long as they ...

Martin Sulzmann; Edmund S. L. Lam

2008-07-01T23:59:59.000Z

128

The DynCOAA algorithm for dynamic constraint optimization problems  

Science Conference Proceedings (OSTI)

Numerous problems in software coordination, operations research, manufacturing control and others can be transformed in constraint optimization problems (COPs). Moreover, most practical problems change constantly, requiring algorithms that can handle ... Keywords: ACO, distributed constraint optimization, dynamic

Koenraad Mertens; Tom Holvoet; Yolande Berbers

2006-05-01T23:59:59.000Z

129

Open bisimulation for the concurrent constraint pi-calculus  

Science Conference Proceedings (OSTI)

The concurrent constraint pi-calculus (cc-pi-calculus) has been introduced as a model for concluding Service Level Agreements. The cc-pi calculus combines the synchronous communication paradigm of process calculi with the constraint handling mechanism ...

Maria Grazia Buscemi; Ugo Montanari

2008-03-01T23:59:59.000Z

130

Energetics of a Symmetric Circulation Including Momentum Constraints  

Science Conference Proceedings (OSTI)

A theory of available potential energy (APE) for symmetric circulations, which includes momentum constraints, is presented. The theory is a generalization of the classical theory of APE, which includes only thermal constraints on the circulation. ...

Sorin Codoban; Theodore G. Shepherd

2003-08-01T23:59:59.000Z

131

Banshee: a scalable constraint-based analysis toolkit  

Science Conference Proceedings (OSTI)

We introduce Banshee, a toolkit for constructing constraint-based analyses. Banshee's novel features include a code generator for creating customized constraint resolution engines, incremental analysis based on backtracking, and fast persistence. ...

John Kodumal; Alex Aiken

2005-09-01T23:59:59.000Z

132

Technical constraints limiting application of enhanced oil recovery techniques to petroleum production in the United States  

SciTech Connect

A cost-shared program was initiated in 1974 to accelerate the application of advanced EOR processes. An incentive program was also announced in 1979 for the commercialization of EOR techniques. This report provides a summary of the EOR state-of-the-art and draws upon the data base developed thus far. A critical review of four major cost-shared chemical projects is included. Chemical recovery, miscible recovery, and thermal recovery techniques are covered. The FY 1979 DOE EOR program is summarized in a table. (DLC)

Not Available

1980-09-01T23:59:59.000Z

133

through genetic constraints that limit the diversity of classes produced or  

E-Print Network (OSTI)

5 10 Forelius sp. 3 1 3 7 Formica dolosa Buren 0 2 0 2 Formica pallidefulva Latreille 13 22 15 50 Formica subsericea Say 6 11 12 29 Hypoponera opacior (Forel) 16 22 14 52 Lasius alienus (Foerster) 9 22 15, Jennifer Chandler, and Michael Wittenberg for their assistance with pitfall trap- ping and insect sorting

Cheng, Ken

134

Solar System constraints to nonminimally coupled gravity  

E-Print Network (OSTI)

We extend the analysis of Chiba, Smith and Erickcek \\cite{CSE} of Solar System constraints on $f(R)$ gravity to a class of nonminimally coupled (NMC) theories of gravity. These generalize $f(R)$ theories by replacing the action functional of General Relativity (GR) with a more general form involving two functions $f^1(R)$ and $f^2(R)$ of the Ricci scalar curvature $R$. While the function $f^1(R)$ is a nonlinear term in the action, analogous to $f(R)$ gravity, the function $f^2(R)$ yields a NMC between the matter Lagrangian density $\\LL_m$ and the scalar curvature. The developed method allows for obtaining constraints on the admissible classes of functions $f^1(R)$ and $f^2(R)$, by requiring that predictions of NMC gravity are compatible with Solar System tests of gravity. We apply this method to a NMC model which accounts for the observed accelerated expansion of the Universe.

Orfeu Bertolami; Riccardo March; Jorge Páramos

2013-06-05T23:59:59.000Z

135

Dictionary learning under global sparsity constraint  

E-Print Network (OSTI)

A new method is proposed in this paper to learn overcomplete dictionary from training data samples. Differing from the current methods that enforce similar sparsity constraint on each of the input samples, the proposed method attempts to impose global sparsity constraint on the entire data set. This enables the proposed method to fittingly assign the atoms of the dictionary to represent various samples and optimally adapt to the complicated structures underlying the entire data set. By virtue of the sparse coding and sparse PCA techniques, a simple algorithm is designed for the implementation of the method. The efficiency and the convergence of the proposed algorithm are also theoretically analyzed. Based on the experimental results implemented on a series of signal and image data sets, it is apparent that our method performs better than the current dictionary learning methods in original dictionary recovering, input data reconstructing, and salient data structure revealing.

Meng, Deyu; Zhao, Qian; Xu, Zongben

2012-01-01T23:59:59.000Z

136

Markets indicate possible natural gas pipeline constraints in the ...  

U.S. Energy Information Administration (EIA)

Biofuels: Ethanol & Biodiesel ... This difference reflects expectations about the likelihood of capacity constraints associated with moving natural gas on pipelines ...

137

equality constraints, riemannian manifolds and direct search methods  

E-Print Network (OSTI)

Aug 2, 2007 ... EQUALITY CONSTRAINTS, RIEMANNIAN MANIFOLDS AND DIRECT SEARCH METHODS. David W. Dreisigmeyer(dreisigm ***at*** lanl.gov).

138

Solar system constraints on Rindler acceleration  

E-Print Network (OSTI)

We discuss the classical tests of general relativity in the presence of Rindler acceleration. Among these tests the perihelion shifts give the tightest constraints and indicate that the Pioneer anomaly cannot be caused by a universal solar system Rindler acceleration. We address potential caveats for massive test-objects. Our tightest bound on Rindler acceleration that comes with no caveats is derived from radar echo delay and yields |a|<3nm/s^2.

Sante Carloni; Daniel Grumiller; Florian Preis

2011-03-01T23:59:59.000Z

139

Topological constraints in magnetic field relaxation  

E-Print Network (OSTI)

Stability and reconnection of magnetic fields play a fundamental role in natural and man-made plasma. In these applications the field's topology determines the stability of the magnetic field. Here I will describe the importance of one topology quantifier, the magnetic helicity, which impedes any free decay of the magnetic energy. Further constraints come from the fixed point index which hinders the field to relax into the Taylor state.

Candelaresi, Simon

2013-01-01T23:59:59.000Z

140

Forecasting Cosmological Constraints from Redshift Surveys  

E-Print Network (OSTI)

Observations of redshift-space distortions in spectroscopic galaxy surveys offer an attractive method for observing the build-up of cosmological structure, which depends both on the expansion rate of the Universe and our theory of gravity. In this paper we present a formalism for forecasting the constraints on the growth of structure which would arise in an idealized survey. This Fisher matrix based formalism can be used to study the power and aid in the design of future surveys.

Martin White; Yong-Seon Song; Will J. Percival

2008-10-08T23:59:59.000Z

Note: This page contains sample records for the topic "marketplace constraints limit" 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

A mobile agent approach for global database constraint checking  

Science Conference Proceedings (OSTI)

Integrity constraints are valuable tools for enforcing consistency of data in a database. Global integrity constraints ensure integrity and consistency of data spanning multiple databases. In this paper, we propose a general framework of a mobile agent ... Keywords: global constraints, mobile agents, multi-database systems

Praveen Madiraju; Rajshekhar Sunderraman

2004-03-01T23:59:59.000Z

142

Token+constraint systems for tangible interaction with digital information  

Science Conference Proceedings (OSTI)

We identify and present a major interaction approach for tangible user interfaces based upon systems of tokens and constraints. In these interfaces, tokens are discrete physical objects which represent digital information. Constraints are confining regions ... Keywords: Tangible interfaces, token+constraint interfaces

Brygg Ullmer; Hiroshi Ishii; Robert J. K. Jacob

2005-03-01T23:59:59.000Z

143

Leadership Constraints: Leading Global Virtual Teams Through Environmental Complexity  

Science Conference Proceedings (OSTI)

This research focused on the question: What leadership constraints contribute to the complexity of the working environment faced by global virtual team leaders and how do those leadership constraints impact the behavior of leaders when they are trying ... Keywords: Computer Mediated Communication, Constraints, Global Virtual Team, Leadership, Telework

Leslie C. Tworoger, Cynthia P. Ruppel, Baiyun Gong, Randolph A. Pohlman

2013-04-01T23:59:59.000Z

144

Thesis: a generic, collaborative framework for interval constraint solving  

Science Conference Proceedings (OSTI)

The paper abstracts the contents of a PhD dissertation entitled A Generic, Collaborative Framework for Interval Constraint Solving which has been recently defended. This thesis presents a generic framework for defining and solving interval constraints ... Keywords: constraint, cooperation, indexical, lattice, propagation

Antonio J. Fernández

2004-07-01T23:59:59.000Z

145

A Generic, Collaborative Framework for Interval Constraint Solving: Thesis  

Science Conference Proceedings (OSTI)

The paper abstracts the contents of a PhD dissertation entitled A Generic, Collaborative Framework for Interval Constraint Solving which has been recently defended. This thesis presents a generic framework for defining and solving interval constraints ... Keywords: Constraint, cooperation, indexical, lattice, propagation

Antonio J. Fernández

2004-08-01T23:59:59.000Z

146

Magnetic and Electric Dipole Constraints on Extra Dimensions and Magnetic Fluxes  

E-Print Network (OSTI)

The propagation of charged particles and gauge fields in a compact extra dimension contributes to $g-2$ of the charged particles. In addition, a magnetic flux threading this extra dimension generates an electric dipole moment for these particles. We present constraints on the compactification size and on the possible magnetic flux imposed by the comparison of data and theory of the magnetic moment of the muon and from limits on the electric dipole moments of the muon, neutron and electron.

Aaron J. Roy; Myron Bander

2008-05-10T23:59:59.000Z

147

How energy conservation limits our measurements  

E-Print Network (OSTI)

OObservations in Quantum Mechanics are subject to complex restrictions arising from the principle of energy conservation. Determining such restrictions, however, has been so far an elusive task, and only partial results are known. In this paper we discuss how constraints on the energy spectrum of a measurement device translate into limitations on the measurements which we can effect on a target system with non-trivial energy operator. We provide efficient algorithms to characterize such limitations and we quantify them exactly when the target is a two-level quantum system. Our work thus identifies the boundaries between what is possible or impossible to measure, i.e., between what we can see or not, when energy conservation is at stake.

Miguel Navascues; Sandu Popescu

2012-11-09T23:59:59.000Z

148

Cosmological constraints on the curvaton web parameters  

E-Print Network (OSTI)

We consider the mixed inflaton-curvaton scenario in which quantum fluctuations of the curvaton field during inflation lead to a relatively large curvature perturbation spectrum at small scales. We use the model of chaotic inflation with quadratic potential including supergravity corrections leading to a large positive tilt in the power spectrum of the curvaton field. The model is characterized by the strongly inhomogeneous curvaton field in the Universe and large non-Gaussianity of curvature perturbations at small scales. We obtained the constraints on the model parameters considering the process of primordial black hole (PBH) production in radiation era.

Edgar Bugaev; Peter Klimai

2012-12-28T23:59:59.000Z

149

Detector limitations, STAR  

Science Conference Proceedings (OSTI)

Every detector has limitations in terms of solid angle, particular technologies chosen, cracks due to mechanical structure, etc. If all of the presently planned parts of STAR [Solenoidal Tracker At RHIC] were in place, these factors would not seriously limit our ability to exploit the spin physics possible in RHIC. What is of greater concern at the moment is the construction schedule for components such as the Electromagnetic Calorimeters, and the limited funding for various levels of triggers.

Underwood, D. G.

1998-07-13T23:59:59.000Z

150

Limited Warranty Research In Motion Limited (“RIM”), the ...  

Science Conference Proceedings (OSTI)

... Handheld Limited Warranty (Jordan) 072406 (English) (UK Version 082504) 1 Page 2. Handheld Limited Warranty (Jordan ...

2012-11-15T23:59:59.000Z

151

Credit Constraints, Learning and Aggregate Consumption Volatility  

E-Print Network (OSTI)

This paper documents three empirical facts. First, consumption volatility relative to income volatility rose from 1947-1960 and then fell dramatically by 75 percent from the 1960s to the 1990s. Second, the correlation between consumption growth and personal income growth fell by about 75 percent over the same time period. Finally, absolute deviations of consumption changes from their mean exhibit two breaks in U.S. data, and the mean size of the absolute deviations has again fallen by about 75 percent. First, I find that a standard benchmark permanent income hypothesis model is unable to explain these facts. Then, I examine the ability of two hypotheses: a fall in credit constraints and changing beliefs about the permanence of income shocks to explain these facts. I find evidence for both explanations and find that these facts can be almost completely explained by a model with learning about the nature of income shocks and a reduction in credit constraints. Importantly, I find that estimated changes in beliefs about the permanence of income shocks have substantial explanatory power for consumption changes.

Daniel L. Tortorice

2009-01-01T23:59:59.000Z

152

Constraints on cosmological parameters from MAXIMA-1  

SciTech Connect

We set new constraints on a seven-dimensional space of cosmological parameters within the class of inflationary adiabatic models. We use the angular power spectrum of the cosmic microwave background measured over a wide range of l in the first flight of the MAXIMA balloon-borne experiment (MAXIMA-1) and the low-l results from the COBE Differential Microwave Radiometer experiment. We find constraints on the total energy density of the universe, Omega = 1.0(-0.30)(+0.15), the physical density of baryons, Omega (b)h(2) = 0.03 +/- 0.01, the physical density of cold dark matter, Omega (cdm)h(2) = 0.2(-0.1)(+0.2), and the spectral index of primordial scalar fluctuations, n(s) = 1.08 +/- 0.1,all at the 95 percent confidence level. By combining our results with measurements of high-redshift supernovae we constrain the value of the cosmological constant and the fractional amount of pressureless matter in the universe to 0.45<(Lambda)<0.75 and 0.25

Balbi, A.; Ade, P.; Bock, J.; Borrill, J.; Boscaleri, A.; DeBernardis, P.; Ferreira, P.G.; Hanany, S.; Hristov, V.; Jaffe, A.H.; Lee,A.T.; Oh, S.; Pascale; E.; Rabii, B.; Richards, R.L.; Smoot, G.F.; Stompor, R.; Winant, C.D.; Wu, J.H.P.

2006-05-08T23:59:59.000Z

153

A Global Chance-Constraint for Stochastic Inventory Systems Under Service Level Constraints  

Science Conference Proceedings (OSTI)

We consider a class of production/inventory control problems that has a single product and a single stocking location, for which a stochastic demand with a known non-stationary probability distribution is given. Under the widely-known replenishment cycle ... Keywords: Global chance-constraints, Non-stationary (R,S) policy, Stochastic inventory control, Uncertainty

Roberto Rossi; S. Armagan Tarim; Brahim Hnich; Steven Prestwich

2008-12-01T23:59:59.000Z

154

Early Lifecycle Work: Influence of Individual Characteristics,Methodological Constraints, and Interface Constraints  

Science Conference Proceedings (OSTI)

This paper reports the results of an experiment undertaken for the CADPRO (Constraints And the Decision PROject) project. Subjects with varied experience produced data flow diagrams (DFDs) using a DFD tool generated by CASEMaker, a meta-CASE ... Keywords: CASE tools, human-computer interface, methodological support

Andrew Brooks; Fredrik Utbult; Catherine Mulligan; Ross Jeffery

2000-11-01T23:59:59.000Z

155

Limited discrepancy search revisited  

Science Conference Proceedings (OSTI)

Harvey and Ginsberg's limited discrepancy search (LDS) is based on the assumption that costly heuristic mistakes are made early in the search process. Consequently, LDS repeatedly probes the state space, going against the heuristic (i.e., taking discrepancies) ... Keywords: Heuristic mistakes, limited discrepancy search, performance improvement

Patrick Prosser; Chris Unsworth

2011-05-01T23:59:59.000Z

156

Luminosity limitations at the multi-TeV linear collider energy frontier  

E-Print Network (OSTI)

To achieve the desired high luminosity in e+ e- linear colliders with centre-of-mass energies above the TeV scale, careful optimisation of the beam parameters is necessary. Constraints arising from the RF structure design, the beam-beam interaction, the damping ring and the beam delivery system have to be taken into account and compromises between different requirements have to be found. The nature of these different constraints is discussed and the resulting limits for the luminosity are detailed.

Schulte, Daniel

2002-01-01T23:59:59.000Z

157

CONTROL LIMITER DEVICE  

DOE Patents (OSTI)

A control-limiting device for monltoring a control system is described. The system comprises a conditionsensing device, a condition-varying device exerting a control over the condition, and a control means to actuate the condition-varying device. A control-limiting device integrates the total movement or other change of the condition-varying device over any interval of time during a continuum of overlapping periods of time, and if the tothl movement or change of the condition-varying device exceeds a preset value, the control- limiting device will switch the control of the operated apparatus from automatic to manual control.

DeShong, J.A.

1960-03-01T23:59:59.000Z

158

Capacity with energy constraint in coherent state channel  

E-Print Network (OSTI)

We consider two kind of energy constraints when the output state is a coherent state. One is a constraint on the total energy during a fixed period; the other is a constraint on the total energy for a single code. The first setting can be easily dealt with by using the conventional capacity formula. The second setting requires the general capacity formula for a classical-quantum channel.

Masahito Hayashi

2009-04-02T23:59:59.000Z

159

On Relaxing the Mangasarian–Fromovitz Constraint Qualification  

E-Print Network (OSTI)

constraint qualification in the local analysis of the solution map to a parame- .... when I2(Żx) is large, verifying this condition can still be a challenging job.

160

The dose–volume constraint satisfaction problem for inverse ...  

E-Print Network (OSTI)

Jan 30, 2004 ... volume constraint satisfaction search for the discretized radiation therapy model. ..... This was dictated by an emphasis in this report on testing.

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


161

Geodetic Constraints on Contemporary Deformation in the Northern...  

Open Energy Info (EERE)

America, 2009 DOI Not Provided Check for DOI availability: http:crossref.org Online Internet link for Geodetic Constraints on Contemporary Deformation in the Northern Walker...

162

Business Case Slide 34: Regulatory Constraints Analysis (ANL...  

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

Regulatory Constraints Analysis (ANL) - Program Focus Program focus ANL will be preparing a risk analysis and regulatory plan for a specific case: use of DU in catalysts Enhance...

163

Business Case Slide 32: Regulatory Constraints Analysis (ANL...  

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

Regulatory Constraints Analysis (ANL) - Description Description Enabling activity cross-cutting all potential uses of DU in radiologically unregulated areas Tasks Evaluate...

164

Business Case Slide 33: Regulatory Constraints Analysis (ANL...  

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

Previous Slide Next Slide Table of Contents Regulatory Constraints Analysis (ANL) - Status Status Evaluation of current status completed in FY02 All manufacturing of DU products...

165

Benders decomposition for the hop-constrainted survivable network ...  

E-Print Network (OSTI)

level of transmission reliability in the sense that the probability that all the transmission lines in the path are working ...... availability constraints. Comput. & OR 15 ...

166

Effects of geometric constraints and sample topology on superconductivity.  

E-Print Network (OSTI)

??The goal of this dissertation is to explore the effects of geometric constraints and sample topology on superconductivity. This work started with an effort to… (more)

Staley, Neal

2012-01-01T23:59:59.000Z

167

Exact Solution of Graph Coloring Problems via Constraint ...  

E-Print Network (OSTI)

Wireless Mesh Networks. Capone et al. (2010). Employee ...... Integrating operations research in constraint programming. 4OR: Quart. J. Oper. Res. 4 1–45

168

Production Scheduling with Energy Efficiency Constraints  

E-Print Network (OSTI)

This research is motivated by a real world production scheduling problem in a continuous manufacturing system involving multiple objectives, multiple products and multiple processing lines with various inventory, production and energy efficiency constraints. Because of the conflicting objectives, an optimization approach is considered as not feasible by the plant management. Given a customer demand forecast, three practical heuristic algorithms are developed to generate daily production schedules for three conflicting objectives: minimize shipment delays, minimize average inventory levels, and minimize product switch-over to avoid energy waste. Since each heuristic is designed to give priority to one of the three conflicting objectives, none of them is absolutely superior to the other algorithms in all aspects. However, the management can assign weights to each of the three objectives to identify the schedule that minimizes the total cost index.

Lee, J.; Kozman, T. A.; Wang, X.

2007-01-01T23:59:59.000Z

169

MODELING OBSERVATIONAL CONSTRAINTS FOR DARK MATTER HALOS  

SciTech Connect

Observations show that the underlying rotation curves at intermediate radii in spiral and low-surface-brightness galaxies are nearly universal. Further, in these same galaxies, the product of the central density and the core radius ({rho}{sub 0} r{sub 0}) is constant. An empirically motivated model for dark matter halos that incorporates these observational constraints is presented and shown to be in accord with the observations. A model fit to the observations of the galaxy cluster A611 shows that {rho}{sub 0} r{sub 0} for the dark matter halo in this more massive structure is larger by a factor of {approx}20 over that assumed for the galaxies. The model maintains the successful Navarro-Frenk-White form in the outer regions, although the well-defined differences in the inner regions suggest that modifications to the standard cold dark matter picture are required.

Hartwick, F. D. A. [Department of Physics and Astronomy, University of Victoria, Victoria, BC V8W 3P6 (Canada)

2012-12-01T23:59:59.000Z

170

Nuclear Fuels: Promise and Limitations  

Science Conference Proceedings (OSTI)

From 1950 through 1980, scientists, engineers and national leaders confidently predicted an early twenty-first century where fast breeder reactors and commercial nuclear fuel reprocessing were commonplace. Such a scenario seemed necessary for a world with the more than 1000 GWe of nuclear energy needed to meet such an ever-increasing thirst for energy. Thirty years later uranium reserves are increasing on pace with consumption, the growth of nuclear power has been slowed, commercial breeder reactors have yet to enter the marketplace, and less than a handful of commercial reprocessing plants operate. As Nobel Laureate Niels Bohr famously said, “Prediction is very difficult, especially if it’s about the future.” The programme for IChemE’s 2012 conference on the nuclear fuel cycle features a graphic of an idealized nuclear fuel cycle that symbolizes the quest for a closed nuclear fuel cycle featuring careful husbanding of precious resources while minimizing the waste footprint. Progress toward achieving this ideal has been disrupted by technology innovations in the mining and petrochemical industries, as well as within the nuclear industry.

Harold F. McFarlane

2012-03-01T23:59:59.000Z

171

Accurate location estimation of moving object with energy constraint & adaptive update algorithms to save data  

E-Print Network (OSTI)

In research paper "Accurate estimation of the target location of object with energy constraint & Adaptive Update Algorithms to Save Data" one of the central issues in sensor networks is track the location, of moving object which have overhead of saving data, an accurate estimation of the target location of object with energy constraint .We do not have any mechanism which control and maintain data .The wireless communication bandwidth is also very limited. Some field which is using this technique are flood and typhoon detection, forest fire detection, temperature and humidity and ones we have these information use these information back to a central air conditioning and ventilation system. In this research paper, we propose protocol based on the prediction and adaptive based algorithm which is using less sensor node reduced by an accurate estimation of the target location. we are using minimum three sensor node to get the accurate position .We can extend it upto four or five to find more accurate location ...

Semwal, Vijay Bhaskar; Bhaskar, Vinay S; Sati, Meenakshi

2011-01-01T23:59:59.000Z

172

Control over multiscale systems with constraints. 3. Geometrodynamics of the evolution of systems with varying constraints  

E-Print Network (OSTI)

With the use of the general variational principle of self-organization of systems with varying constraints, namely the principle of dynamical harmonization of systems presented in the first work of the cycle, we advance an approach to the control over the evolution of systems of many particles. The geometric nature of this principle is analyzed. On the basis of the de Broglie--Bohm representation of the Schr\\"odinger equation, we establish a connection of the nonlocality and the coherence of the systems of many particles with mass entropic forces. The defining role of a coherent acceleration and a space-time curvature in the control over the synthesis of new structures in systems with varying constraints is demonstrated. The basic criteria for electromagnetic fields to initiate the processes of self-organizing synthesis and for the quantum properties of a nonlocality on macroscopic scales, which are necessary for the self-organizing synthesis, are formulated.

S. Adamenko; V. Bolotov; V. Novikov

2013-07-17T23:59:59.000Z

173

LHC constraints on light neutralino dark matter in the MSSM  

E-Print Network (OSTI)

Light neutralino dark matter can be achieved in the Minimal Supersymmetric Standard Model if staus are rather light, with mass around 100 GeV. We perform a detailed analysis of the relevant supersymmetric parameter space, including also the possibility of light selectons and smuons, and of light higgsino- or wino-like charginos. In addition to the latest limits from direct and indirect detection of dark matter, ATLAS and CMS constraints on electroweak-inos and on sleptons are taken into account using a "simplified models" framework. Measurements of the properties of the Higgs boson at 125 GeV, which constrain amongst others the invisible decay of the Higgs boson into a pair of neutralinos, are also implemented in the analysis. We show that viable neutralino dark matter can be achieved for masses as low as 15 GeV. In this case, light charginos close to the LEP bound are required in addition to light right-chiral staus. Significant deviations are observed in the couplings of the 125 GeV Higgs boson. These constitute a promising way to probe the light neutralino dark matter scenario in the next run of the LHC.

Genevieve Belanger; Guillaume Drieu La Rochelle; Beranger Dumont; Rohini M. Godbole; Sabine Kraml; Suchita Kulkarni

2013-08-16T23:59:59.000Z

174

Dark Matter Constraints from a Cosmic Index of Refraction  

E-Print Network (OSTI)

The dark-matter candidates of particle physics invariably possess electromagnetic interactions, if only via quantum fluctuations. Taken en masse, dark matter can thus engender an index of refraction which deviates from its vacuum value. Its presence is signaled through frequency-dependent effects in the propagation and attenuation of light. We discuss theoretical constraints on the expansion of the index of refraction with frequency, the physical interpretation of the terms, and the particular observations needed to isolate its coefficients. This, with the advent of new opportunities to view gamma-ray bursts at cosmological distance scales, gives us a new probe of dark matter and a new possibility for its direct detection. As a first application we use the time delay determined from radio afterglow observations of distant gamma-ray bursts to realize a direct limit on the electric-charge-to-mass ratio of dark matter of |varepsilon|/M < 1 x 10^{-5} eV^{-1} at 95% CL.

S. Gardner; D. C. Latimer

2009-04-10T23:59:59.000Z

175

First Constraints on Rings in the Pluto System  

E-Print Network (OSTI)

Simple theoretical calculations have suggested that small body impacts onto Pluto's newly discovered small satellites, Nix and Hydra, are capable of generating time-variable rings or dust sheets in the Pluto system. We present the first observational constraints on the present-day optical depth of such debris systems using HST/ACS data obtained on 2006 February 15 and 2006 March 2. We find that any Plutonian dust rings between Nix and Hydra must have optical depths of 2x10^(-5) or lower, when averaged over 1000-km radial distance scales. While usefully constraining, the derived ring optical depth limits are still a factor of four higher than those predicted by Stern et al. (2006). Were the New Horizons spacecraft to fly through a ring system with optical depth as high as 2x10^(-5), it would collide with a significant number of potentially damaging ring particles. We therefore recommend that New Horizons cross the potential ring plane at a radial distance where dust rings are not expected due to either dynamic...

Steffl, A J

2006-01-01T23:59:59.000Z

176

Dark matter constraints from a cosmic index of refraction  

SciTech Connect

The dark matter candidates of particle physics invariably possess electromagnetic interactions, if only via quantum fluctuations. Taken en masse, dark matter can thus engender an index of refraction which deviates from its vacuum value. Its presence is signaled through frequency-dependent effects in the propagation and attenuation of light. We discuss theoretical constraints on the expansion of the index of refraction with frequency, the physical interpretation of the terms, and the particular observations needed to isolate its coefficients. This, with the advent of new opportunities to view gamma-ray bursts at cosmological distance scales, gives us a new probe of dark matter and a new possibility for its direct detection. As a first application we use the time delay determined from radio afterglow observations of distant gamma-ray bursts to realize a direct limit on the electric charge-to-mass ratio of dark matter of |{epsilon}|/M<1x10{sup -5} eV{sup -1} at 95% C.L.

Gardner, Susan [Center for Particle Astrophysics and Theoretical Physics Department, Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States); Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055 (United States); Latimer, David C. [Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055 (United States)

2010-09-15T23:59:59.000Z

177

Security Clearances; Limitations  

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

SEC. 1072. SECURITY CLEARANCES; LIMITATIONS. SEC. 1072. SECURITY CLEARANCES; LIMITATIONS. (a) In General.-Title III of the Intelligence Reform and Terrorism Prevention Act of 2004 (50 U.S.C. 435b) is amended by adding at the end the following new section: "SEC. 3002. SECURITY CLEARANCES; LIMITATIONS. "(a) Definitions.-In this section: "(1) Controlled substance.-The term `controlled substance' has the meaning given that term in section 102 of the Controlled Substances Act (21 U.S.C. 802). "(2) Covered person.-The term `covered person' means- "(A) an officer or employee of a Federal agency; "(B) a member of the Army, Navy, Air Force, or Marine Corps who is on active duty or is in an active status; and "(C) an officer or employee of a contractor of a Federal agency.

178

Key-Based Problem Decomposition for Relational Constraint Satisfaction Problems  

Science Conference Proceedings (OSTI)

Constraint satisfaction problems (CSP) are often posed over data residing in relational database systems, which serve as passive data-storage back ends. Several studies have demonstrated a number of important advantages to having database systems capable ... Keywords: constraint processing, databases, decomposition

James J. Lu; Sebastien Siva

2011-11-01T23:59:59.000Z

179

Estimating a Demand System with Nonnegativity Constraints: Mexican Meat Demand  

E-Print Network (OSTI)

: Properties of the AIDS Generalized Maximum Entropy Estimator 24 #12;Estimating a Demand SystemEstimating a Demand System with Nonnegativity Constraints: Mexican Meat Demand Amos Golan* Jeffrey with nonnegativity constraints is presented. This approach, called generalized maximum entropy (GME), is more

Perloff, Jeffrey M.

180

An iterative distributed algorithm for multi-constraint multicast routing  

Science Conference Proceedings (OSTI)

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

Tzu-Lun Huang; D. T. Lee

2006-11-01T23:59:59.000Z

Note: This page contains sample records for the topic "marketplace constraints limit" 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

Constraint multi-objective automated synthesis for CMOS operational amplifier  

Science Conference Proceedings (OSTI)

A multi-objective evolution algorithm (MOEA) is presented to automatically determine the parameters in Op-Amp synthesis where the cost functions (e.g., minimizing the power dissipation and the chip area) and the constraint functions (e.g., the user-defined ... Keywords: CMOS Op-Amp, Constraint handling, Elitist maintaining, Multi-objective evolution algorithm

Jili Tao; Qinru Fan; Xiaoming Chen; Yong Zhu

2012-12-01T23:59:59.000Z

182

An automata-theoretic approach to constraint LTL  

Science Conference Proceedings (OSTI)

We consider an extension of linear-time temporal logic (LTL) with constraints interpreted over a concrete domain. We use a new automata-theoretic technique to show PSPACE decidability of the logic for the constraint systems (Z, Keywords: Logics of space and time, Model-checking, Temporal logic

Stéphane Demri; Deepak D'Souza

2007-03-01T23:59:59.000Z

183

Search Search Strategies for Scheduling Constraint-based Scheduling  

E-Print Network (OSTI)

Search Search Strategies for Scheduling Constraint-based Scheduling: Search Strategies Hana Rudová-based Scheduling: Search Strategies 1/10 #12;Search Search Strategies for Scheduling Outline 1 Search 2 Search Strategies for Scheduling Constraint-based Scheduling: Search Strategies 2/10 #12;Search Search Strategies

Qu, Rong

184

China's Coal: Demand, Constraints, and Externalities  

Science Conference Proceedings (OSTI)

This study analyzes China's coal industry by focusing on four related areas. First, data are reviewed to identify the major drivers of historical and future coal demand. Second, resource constraints and transport bottlenecks are analyzed to evaluate demand and growth scenarios. The third area assesses the physical requirements of substituting coal demand growth with other primary energy forms. Finally, the study examines the carbon- and environmental implications of China's past and future coal consumption. There are three sections that address these areas by identifying particular characteristics of China's coal industry, quantifying factors driving demand, and analyzing supply scenarios: (1) reviews the range of Chinese and international estimates of remaining coal reserves and resources as well as key characteristics of China's coal industry including historical production, resource requirements, and prices; (2) quantifies the largest drivers of coal usage to produce a bottom-up reference projection of 2025 coal demand; and (3) analyzes coal supply constraints, substitution options, and environmental externalities. Finally, the last section presents conclusions on the role of coal in China's ongoing energy and economic development. China has been, is, and will continue to be a coal-powered economy. In 2007 Chinese coal production contained more energy than total Middle Eastern oil production. The rapid growth of coal demand after 2001 created supply strains and bottlenecks that raise questions about sustainability. Urbanization, heavy industrial growth, and increasing per-capita income are the primary interrelated drivers of rising coal usage. In 2007, the power sector, iron and steel, and cement production accounted for 66% of coal consumption. Power generation is becoming more efficient, but even extensive roll-out of the highest efficiency units would save only 14% of projected 2025 coal demand for the power sector. A new wedge of future coal consumption is likely to come from the burgeoning coal-liquefaction and chemicals industries. If coal to chemicals capacity reaches 70 million tonnes and coal-to-liquids capacity reaches 60 million tonnes, coal feedstock requirements would add an additional 450 million tonnes by 2025. Even with more efficient growth among these drivers, China's annual coal demand is expected to reach 3.9 to 4.3 billion tonnes by 2025. Central government support for nuclear and renewable energy has not reversed China's growing dependence on coal for primary energy. Substitution is a matter of scale: offsetting one year of recent coal demand growth of 200 million tonnes would require 107 billion cubic meters of natural gas (compared to 2007 growth of 13 BCM), 48 GW of nuclear (compared to 2007 growth of 2 GW), or 86 GW of hydropower capacity (compared to 2007 growth of 16 GW). Ongoing dependence on coal reduces China's ability to mitigate carbon dioxide emissions growth. If coal demand remains on a high growth path, carbon dioxide emissions from coal combustion alone would exceed total US energy-related carbon emissions by 2010. Within China's coal-dominated energy system, domestic transportation has emerged as the largest bottleneck for coal industry growth and is likely to remain a constraint to further expansion. China has a low proportion of high-quality reserves, but is producing its best coal first. Declining quality will further strain production and transport capacity. Furthermore, transporting coal to users has overloaded the train system and dramatically increased truck use, raising transportation oil demand. Growing international imports have helped to offset domestic transport bottlenecks. In the long term, import demand is likely to exceed 200 million tonnes by 2025, significantly impacting regional markets.

Aden, Nathaniel; Fridley, David; Zheng, Nina

2009-07-01T23:59:59.000Z

185

MUSE CSP: An Extension to the Constraint Satisfaction Problem  

E-Print Network (OSTI)

This paper describes an extension to the constraint satisfaction problem (CSP) called MUSE CSP (MUltiply SEgmented Constraint Satisfaction Problem). This extension is especially useful for those problems which segment into multiple sets of partially shared variables. Such problems arise naturally in signal processing applications including computer vision, speech processing, and handwriting recognition. For these applications, it is often difficult to segment the data in only one way given the low-level information utilized by the segmentation algorithms. MUSE CSP can be used to compactly represent several similar instances of the constraint satisfaction problem. If multiple instances of a CSP have some common variables which have the same domains and constraints, then they can be combined into a single instance of a MUSE CSP, reducing the work required to apply the constraints. We introduce the concepts of MUSE node consistency, MUSE arc consistency, and MUSE path consistency. We th...

Randall A. Helzerman; Mary P. Harpe

1996-01-01T23:59:59.000Z

186

Glass Composition Constraint Recommendations for Use in Life-Cycle Mission Modeling  

Science Conference Proceedings (OSTI)

The component concentration limits that most influence the predicted Hanford life-cycle HLW glass volume by HTWOS were re-evaluated. It was assumed that additional research and development work in glass formulation and melter testing would be performed to improve the understanding of component effects on the processability and product quality of these HLW glasses. Recommendations were made to better estimate the potential component concentration limits that could be applied today while technology development is underway to best estimate the volume of HLW glass that will eventually be produced at Hanford. The limits for concentrations of P2O5, Bi2O3, and SO3 were evaluated along with the constraint used to avoid nepheline formation in glass. Recommended concentration limits were made based on the current HLW glass property models being used by HTWOS (Vienna et al. 2009). These revised limits are: 1) The current ND should be augmented by the OB limit of OB ? 0.575 so that either the normalized silica (NSi) is less that the 62% limit or the OB is below the 0.575 limit. 2) The mass fraction of P2O5 limit should be revised to allow for up to 4.5 wt%, depending on CaO concentrations. 3) A Bi2O3 concentration limit of 7 wt% should be used. 4) The salt accumulation limit of 0.5 wt% SO3 may be increased to 0.6 wt%. Again, these revised limits do not obviate the need for further testing, but make it possible to more accurately predict the impact of that testing on ultimate HLW glass volumes.

McCloy, John S.; Vienna, John D.

2010-05-03T23:59:59.000Z

187

Systematic versus non systematic techniques for solving temporal constraints in a dynamic environment  

Science Conference Proceedings (OSTI)

A main challenge when designing constraint based systems in general and those involving temporal constraints in particular, is the ability to deal with constraints in a dynamic and evolutive environment. That is to check, anytime a new constraint is ... Keywords: Temporal reasoning, constraint propagation, genetic algorithms, stochastic local search

Malek Mouhoub

2004-12-01T23:59:59.000Z

188

An integrated approach to engineer and enforce context constraints in RBAC environments  

Science Conference Proceedings (OSTI)

We present an approach that uses special purpose role-based access control (RBAC) constraints to base certain access control decisions on context information. In our approach a context constraint is defined as a dynamic RBAC constraint that checks ... Keywords: Context-dependent access control, constraints engineering, context constraints, role-based access control

Mark Strembeck; Gustaf Neumann

2004-08-01T23:59:59.000Z

189

Improving Area Control Error Diversity Interchange (ADI) Program by Incorporating Congestion Constraints  

SciTech Connect

The area control error (ACE) determines how much a balancing authority (BA) needs to move its regulating units to meet mandatory control performance standard requirements. Regulation is an expensive resource that could cost several hundred million dollars a year for a BA. The amount of regulation needed in a system is increasing with more intermittent generation resources added to the system. The ACE diversity interchange (ADI) program provides a tool for reducing the regulation requirement by combining ACEs from several participating BAs followed by sharing the total ACE among all participating balancing areas. The effect is achieved as a result of the low statistical correlation between the original ACEs of participating BAs. A rule-based ADI approach has already been put into practice in the US Western Interconnection. The degree of actual ACE sharing is artificially limited because of the unknown redistribution of power flows and possible system congestion (these factors are not monitored in the existing ADI). This paper proposes a two-step linear programming (LP) ADI approach that incorporates congestion constraints. In the first step of the proposed LP ADI, the line transmission limits are enforced by setting up corresponding constraints. In the second step, the business fairness is pursued. Simulation is performed to compare the properties of the proposed LP ADI and the existing rule-based ADI. Favorable features, such as avoiding line limit violations and increasing the degree of possible ACE sharing, are observed for the proposed LP ADI.

Zhou, Ning; Etingov, Pavel V.; Makarov, Yuri V.; Guttromson, Ross T.; McManus, Bart

2010-04-30T23:59:59.000Z

190

Efficiently ordering subgoals with access constraints  

Science Conference Proceedings (OSTI)

In this paper, we study the problem of ordering subgoals under binding pattern restrictions for queries posed as nonrecursive Datalog programs. We prove that despite their limited expressive power, the problem is computationally hard—PSPACE-complete ... Keywords: binding pattern, executability, nonrecursive datalog, query

Guizhen Yang; Michael Kifer; Vinay K. Chaudhri

2006-06-01T23:59:59.000Z

191

Cosmic String constraints from WMAP and SPT  

E-Print Network (OSTI)

The predictions of the inflationary LCDM paradigm match today's high-precision measurements of the cosmic microwave background anisotropy with remarkable precision. The same data put tight limits on other sources of anisotropy. Cosmic strings are a particularly interesting alternate source to constrain. Strings are topological defects, remnants of inflationary-era physics that persist after the big bang. They are formed in a variety of models of inflation, including popular string theory models such as brane inflation. In this paper, we show that measurements of temperature anisotropy by the South Pole Telescope break a parameter degeneracy in the WMAP data, permitting us to place a strong upper limit on the possible string contribution to the CMB anisotropy: the power sourced by zero-width strings must be <1.75% (95% CL) of the total. In the model we use, this translates to an upper limit on the string tension of Gmu < 1.7x10^{-7}. These limits imply that the best hope for detecting strings in the CMB ...

Dvorkin, Cora; Hu, Wayne

2011-01-01T23:59:59.000Z

192

PROJECTED CONSTRAINTS ON THE COSMIC (SUPER)STRING TENSION WITH FUTURE GRAVITATIONAL WAVE DETECTION EXPERIMENTS  

SciTech Connect

We present projected constraints on the cosmic string tension, G{mu}/c {sup 2}, that could be achieved by future gravitational wave detection experiments and express our results as semi-analytic relations of the form G{mu}({Omega}{sub gw} h {sup 2})/c {sup 2}, to allow for direct computation of the tension constraints for future experiments. These results can be applied to new constraints on {Omega}{sub gw} h {sup 2} as they are imposed. Experiments operating in different frequency bands probe different parts of the gravitational wave spectrum of a cosmic string network and are sensitive to different uncertainties in the underlying cosmic string model parameters. We compute the gravitational wave spectra of cosmic string networks based on the one-scale model, covering all the parameter space accessed by each experiment that is strongly dependent on the birth scale of loops relative to the horizon, {alpha}. The upper limits on the string tension avoid any assumptions on the model parameters. We perform this investigation for Pulsar Timing Array experiments of different durations, as well as ground-based and space-borne interferometric detectors.

Sanidas, Sotirios A.; Battye, Richard A.; Stappers, Benjamin W., E-mail: sotiris.sanidas@gmail.com, E-mail: rbattye@jb.man.ac.uk, E-mail: ben.stappers@manchester.ac.uk [Jodrell Bank Centre for Astrophysics, University of Manchester, Manchester, M13 9PL (United Kingdom)

2013-02-10T23:59:59.000Z

193

Comment about constraints on nanometer-range modifications to gravity from low-energy neutron experiments  

E-Print Network (OSTI)

A topic of present interest is the application of experimentally observed quantum mechanical levels of ultra-cold neutrons in the earth's gravitational field for searching short-range modifications to gravity. A constraint on new forces in the nanometer-range published by Nesvizhevsky and Protasov follows from inadequate modelling of the interaction potential of a neutron with a mirror wall. Limits by many orders of magnitude better were already derived long ago from the consistency of experiments on the neutron-electron interaction.

O. Zimmer; N. Kaiser

2006-02-14T23:59:59.000Z

194

A Dichotomy for 2-Constraint Forbidden CSP Patterns  

E-Print Network (OSTI)

Although the CSP (constraint satisfaction problem) is NP-complete, even in the case when all constraints are binary, certain classes of instances are tractable. We study classes of instances defined by excluding subproblems. This approach has recently led to the discovery of novel tractable classes. The complete characterisation of all tractable classes defined by forbidding patterns (where a pattern is simply a compact representation of a set of subproblems) is a challenging problem. We demonstrate a dichotomy in the case of forbidden patterns consisting of either one or two constraints. This has allowed us to discover new tractable classes including, for example, a novel generalisation of 2SAT.

Cooper, Martin C

2012-01-01T23:59:59.000Z

195

A Solution Algorithm for Long Haul Freight Network Design Using Shipper-Carrier Freight Flow Prediction with Explicit Capacity Constraints  

E-Print Network (OSTI)

PREDICTION WITH EXPLICIT CAPACITY CONSTRAINTS Pruttipong “Additionally, an explicit capacity constraint is used toAdditionally, an explicit capacity constraint is used to

Apivatanagul, Pruttipong “Palm”; Regan, A C

2008-01-01T23:59:59.000Z

196

Similarity-based fuzzy limits  

Science Conference Proceedings (OSTI)

In this paper the concept of similarity-based fuzzy limits in metric spaces is introduced and it is shown that it is an application of limit maps of topologies on [0,1]-valued sets, introduced by Hohle and Sostak, furthermore it is observed that the ... Keywords: Fuzzy limit, Limit map, Similarity-based fuzzy limit, [0,1]-Valued topology

Gültekin Soylu

2008-12-01T23:59:59.000Z

197

MSSM Constraints from Higgs Boson Searches  

E-Print Network (OSTI)

The LEP era has brought immense progress in searches for Higgs bosons over the last 12 years which will guide searches at future colliders. The evolution of the Higgs boson mass limits are reviewed with the focus on results from general parameter scans in the Minimal Supersymmetric extension of the Standard Model (MSSM) in contrast to the so-called benchmark limits. The hint for a Standard Model (SM) Higgs boson of 115.6 GeV can also be interpreted as a preference for a Higgs boson of that mass in the MSSM. Further small data excesses allow the hypothesis that the neutral Higgs bosons of the MSSM all have masses between 90 and 116 GeV.

Andre Sopczak

2001-12-05T23:59:59.000Z

198

Improving Land Data Assimilation Performance with a Water Budget Constraint  

Science Conference Proceedings (OSTI)

A weak constraint is introduced in ensemble Kalman filters to reduce the water budget imbalance that occurs in land data assimilation. Two versions of the weakly constrained filter, called the weakly constrained ensemble Kalman filter (WCEnKF) and ...

M. Tugrul Yilmaz; Timothy DelSole; Paul R. Houser

2011-10-01T23:59:59.000Z

199

Stratospheric Influence on Tropopause Height: The Radiative Constraint  

Science Conference Proceedings (OSTI)

Earlier theoretical and modeling work introduced the concept of a radiative constraint relating tropopause height to tropospheric lapse rate and other factors such as surface temperature. Here a minimal quantitative model for the radiative ...

John Thuburn; George C. Craig

2000-01-01T23:59:59.000Z

200

Causal Bounds and Observable Constraints for Non-deterministic Models  

Science Conference Proceedings (OSTI)

Conditional independence relations involving latent variables do not necessarily imply observable independences. They may imply inequality constraints on observable parameters and causal bounds, which can be used for falsification and identification. ...

Roland R. Ramsahai

2012-03-01T23:59:59.000Z

Note: This page contains sample records for the topic "marketplace constraints limit" 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

The range and roots constraints: specifying counting and occurrence problems  

Science Conference Proceedings (OSTI)

We propose a simple declarative language for specifying a wide range of counting and occurrence constraints. This specification language is executable since it immediately provides a polynomial propagation algorithm. To illustrate the capabilities of ...

Christian Bessiere; Emmanuel Hebrard; Brahim Hnich; Zeynep Kiziltan; Toby Walsh

2005-07-01T23:59:59.000Z

202

Ng-Backmarking - an Algorithm for Constraint Satisfaction  

E-Print Network (OSTI)

Ng-backmarking with Min-conflict repair, a hybrid algorithm for solving constraint satisfaction problems, is presented in the context of the four main approaches to constraint satisfaction and optimisation: tree-search, domainfiltering, solution repair, and learning while searching. Repair-based techniques are often designed to use local gradients to direct the search for a solution to a constraint satisfaction problem. It has been shown experimentally that such techniques are often well suited to solving large scale problems. One drawback is that they do not guarantee a (optimal) solution if one exists. The motivation behind ng-backmarking is to allow the search to follow local gradients in the search space whilst ensuring a (optimal) solution if one exists. The search space of this combined approach is controlled by the ng-backmarking process, a method of learning constraints during search (at each failure point 1 ) that may be used to avoid the repeated traversing of failed paths ...

Thomas Richards; Yuejun Jiang; Barry Richards

1995-01-01T23:59:59.000Z

203

(Lack of) lensing constraints on cluster dark matter profiles  

E-Print Network (OSTI)

Using stellar dynamics and strong gravitational lensing as complementary probes, Sand et al. (2002, 2003) have recently claimed strong evidence for shallow dark matter density profiles in several lensing clusters, which may conflict with predictions of the Cold Dark Matter paradigm. However, systematic uncertainties in the analysis weaken the constraints. By re-analyzing their data, we argue that the tight constraints claimed by Sand et al., were driven by prior assumptions. Relaxing the assumptions, we find that no strong constraints may be derived on the dark matter inner profile from the Sand et al. data; we find satisfactory fits (with reasonable parameters) for a wide range of inner slopes 0 < beta < 1.4. Useful constraints on the mass distributions of lensing clusters can still be obtained, but they require moving beyond mere measurements of lensing critical radii into the realm of detailed lens modeling.

Neal Dalal; Charles R. Keeton

2003-12-02T23:59:59.000Z

204

Three level constraints on conformal field theories and string models  

Science Conference Proceedings (OSTI)

Simple tree level constraints for conformal field theories which follow from the requirement of crossing symmetry of four-point amplitudes are presented, and their utility for probing general properties of string models is briefly illustrated and discussed. 9 refs.

Lewellen, D.C.

1989-05-01T23:59:59.000Z

205

Terminal area flight path generation using parallel constraint propagation  

E-Print Network (OSTI)

A Flight Path Generator is defined as the module of an automated Air Traffic Control system which plans aircraft trajectories in the terminal area with respect to operational constraints. The flight path plans have to be ...

Sadoune, Michel

1989-01-01T23:59:59.000Z

206

Constraint-Based charging scheduler design for electric vehicles  

Science Conference Proceedings (OSTI)

This paper proposes an efficient charging scheduler for electric vehicles and measures its performance, aiming at reducing peak power consumption while satisfying the diverse constraints specified in each charging request. Upon the arrival of a charging ...

Hye-Jin Kim; Junghoon Lee; Gyung-Leen Park

2012-03-01T23:59:59.000Z

207

Solving a log-truck scheduling problem with constraint programming  

Science Conference Proceedings (OSTI)

Scheduling problems in the forest industry have received significant attention in the recent years and have contributed many challenging applications for optimization technologies. This paper proposes a solution method based on constraint programming ...

Nizar El Hachemi; Michel Gendreau; Louis-Martin Rousseau

2008-05-01T23:59:59.000Z

208

Effective software testing with a string-constraint solver  

E-Print Network (OSTI)

This dissertation presents techniques and tools for improving software reliability, by using an expressive string-constraint solver to make implementation-based testing more effective and more applicable. Concolic testing ...

Kie?un, Adam

2009-01-01T23:59:59.000Z

209

Maintenance scheduling problems as benchmarks for constraint algorithms  

Science Conference Proceedings (OSTI)

The paper focuses on evaluating constraint satisfaction search algorithms on application based random problem instances. The application we use is a well‐studied problem in the electric power industry: optimally scheduling preventive ...

Daniel Frost; Rina Dechter

1999-09-01T23:59:59.000Z

210

Precise goal-independent abstract interpretation of constraint logic programs  

Science Conference Proceedings (OSTI)

We present a goal-independent abstract interpretation framework for constraint logic programs, and prove the sufficiency of a set of conditions for abstract domains to ensure that the analysis will never lose precision. Along the way, we formally define ...

Peter Schachte

2003-02-01T23:59:59.000Z

211

Large vocabulary continuous speech recognition using linguistic features and constraints  

E-Print Network (OSTI)

Automatic speech recognition (ASR) is a process of applying constraints, as encoded in the computer system (the recognizer), to the speech signal until ambiguity is satisfactorily resolved to the extent that only one ...

Tang, Min, Ph. D. Massachusetts Institute of Technology

2005-01-01T23:59:59.000Z

212

Geodetic Constraints on Contemporary Deformation in the Northern Walker  

Open Energy Info (EERE)

Geodetic Constraints on Contemporary Deformation in the Northern Walker Geodetic Constraints on Contemporary Deformation in the Northern Walker Lane: 2. Velocity and Strain Rate Tensor Analysis- In: Late Cenozoic Structure and Evolution of the Great Basin-Sierra Nevada Transition Jump to: navigation, search OpenEI Reference LibraryAdd to library Book Section: Geodetic Constraints on Contemporary Deformation in the Northern Walker Lane: 2. Velocity and Strain Rate Tensor Analysis- In: Late Cenozoic Structure and Evolution of the Great Basin-Sierra Nevada Transition Abstract Abstract unavailable Authors C. Kreemer, Geoffrey Blewitt and William C. Hammond Editors John S. Oldow and Patricia H. Cashman Published Geological Society of America, 2009 DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for Geodetic Constraints on Contemporary Deformation

213

Identify Vehicle Usage Mission Constraints for Reducing Greenhouse Gas  

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

Identify Vehicle Usage Mission Constraints for Reducing Greenhouse Identify Vehicle Usage Mission Constraints for Reducing Greenhouse Gas Emissions Identify Vehicle Usage Mission Constraints for Reducing Greenhouse Gas Emissions October 7, 2013 - 11:46am Addthis YOU ARE HERE: Step 2 As Federal agencies work to identify opportunities for right-sizing the fleet and replacing inefficient vehicles with new, efficient, and/or alternatively fueled models to reduce greenhouse gas (GHG) emissions, they should flag potential mission constraints associated with vehicle usage. This may involve further data collection to understand the mission considerations associated with individual vehicles. For instance, in Figure 1, Vehicle 004 appears to be underutilized, having both a low user-to-vehicle ratio and a relatively low time in use per day. However,

214

(Limiting the greenhouse effect)  

SciTech Connect

Traveler attended the Dahlem Research Conference organized by the Freien Universitat, Berlin. The subject of the conference was Limiting the Greenhouse Effect: Options for Controlling Atmospheric CO{sub 2} Accumulation. Like all Dahlem workshops, this was a meeting of scientific experts, although the disciplines represented were broader than usual, ranging across anthropology, economics, international relations, forestry, engineering, and atmospheric chemistry. Participation by scientists from developing countries was limited. The conference was divided into four multidisciplinary working groups. Traveler acted as moderator for Group 3 which examined the question What knowledge is required to tackle the principal social and institutional barriers to reducing CO{sub 2} emissions'' The working rapporteur was Jesse Ausubel of Rockefeller University. Other working groups examined the economic costs, benefits, and technical feasibility of options to reduce emissions per unit of energy service; the options for reducing energy use per unit of GNP; and the significant of linkage between strategies to reduce CO{sub 2} emissions and other goals. Draft reports of the working groups are appended. Overall, the conference identified a number of important research needs in all four areas. It may prove particularly important in bringing the social and institutional research needs relevant to climate change closer to the forefront of the scientific and policy communities than hitherto.

Rayner, S.

1991-01-07T23:59:59.000Z

215

(Limiting the greenhouse effect)  

SciTech Connect

Traveler attended the Dahlem Research Conference organized by the Freien Universitat, Berlin. The subject of the conference was Limiting the Greenhouse Effect: Options for Controlling Atmospheric CO{sub 2} Accumulation. Like all Dahlem workshops, this was a meeting of scientific experts, although the disciplines represented were broader than usual, ranging across anthropology, economics, international relations, forestry, engineering, and atmospheric chemistry. Participation by scientists from developing countries was limited. The conference was divided into four multidisciplinary working groups. Traveler acted as moderator for Group 3 which examined the question What knowledge is required to tackle the principal social and institutional barriers to reducing CO{sub 2} emissions'' The working rapporteur was Jesse Ausubel of Rockefeller University. Other working groups examined the economic costs, benefits, and technical feasibility of options to reduce emissions per unit of energy service; the options for reducing energy use per unit of GNP; and the significant of linkage between strategies to reduce CO{sub 2} emissions and other goals. Draft reports of the working groups are appended. Overall, the conference identified a number of important research needs in all four areas. It may prove particularly important in bringing the social and institutional research needs relevant to climate change closer to the forefront of the scientific and policy communities than hitherto.

Rayner, S.

1991-01-07T23:59:59.000Z

216

A class of nonholonomic kinematic constraints in elasticity  

E-Print Network (OSTI)

We propose a first example of a simple classical field theory with nonholonomic constraints. Our model is a straightforward modification of a Cosserat rod. Based on a mechanical analogy, we argue that the constraint forces should be modeled in a special way, and we show how such a procedure can be naturally implemented in the framework of geometric field theory. Finally, we derive the equations of motion and we propose a geometric integration scheme for the dynamics of a simplified model.

Joris Vankerschaver

2006-04-26T23:59:59.000Z

217

Solar system constraints on f(G) gravity models  

E-Print Network (OSTI)

We discuss solar system constraints on f(G) gravity models, where f is a function of the Gauss-Bonnet term G. We focus on cosmologically viable f(G) models that can be responsible for late-time cosmic acceleration. These models generally give rise to corrections of the form epsilon*(r/rs)^p to the vacuum Schwarzschild solution, where epsilon = H^2 rs^2 solar system constraints for a wide range of model parameters.

Antonio De Felice; Shinji Tsujikawa

2009-07-10T23:59:59.000Z

218

Unparticle Effects on Unitarity Constraints from Higgs Boson Scattering  

E-Print Network (OSTI)

We study the effects of two-body Higgs boson scattering by exchanging unpsrticles. The unparticle contribution can change the standard model prediction for two-body Higgs boson scattering partial wave amplitude significantly leading to modification of the unitarity constraint on the standard model Higgs boson mass. For unparticle dimension $d_\\U$ between 1 and 2, the unitarity constraint on Higgs boson mass can be larger than that in the SM. Information on unparticle interaction can also be obtained.

Xiao-Gang He; Chung-Cheng Wen

2008-05-02T23:59:59.000Z

219

Constraints on primordial density perturbations from induced gravitational waves  

SciTech Connect

We consider the stochastic background of gravitational waves produced during the radiation-dominated hot big bang as a constraint on the primordial density perturbation on comoving length scales much smaller than those directly probed by the cosmic microwave background or large-scale structure. We place weak upper bounds on the primordial density perturbation from current data. Future detectors such as BBO and DECIGO will place much stronger constraints on the primordial density perturbation on small scales.

Assadullahi, Hooshyar; Wands, David [Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth PO1 3FX (United Kingdom)

2010-01-15T23:59:59.000Z

220

Fault Current Limiters  

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

Fault Fault Current Limiters Superconducting & Solid-state Power Equipment 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 Plugging America Into the Future of Power What are FCLs? A fault is an unintentional short circuit, or partial short-circuit, in an electric circuit. A variety of factors such as lightning, downed power lines, or crossed power lines cause faults. During a fault, excessive current-called fault current- flows through the electrical system often resulting in a failure of one section of that system by causing a

Note: This page contains sample records for the topic "marketplace constraints limit" 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

PPN-limit of Fourth Order Gravity inspired by Scalar-Tensor Gravity  

E-Print Network (OSTI)

Based on the {\\it dynamical} equivalence between higher order gravity and scalar-tensor gravity the PPN-limit of fourth order gravity is discussed. We exploit this analogy developing a fourth order gravity version of the Eddington PPN-parameters. As a result, Solar System experiments can be reconciled with higher order gravity, if physical constraints descending from experiments are fulfilled.

S. Capozziello; A. Troisi

2005-07-22T23:59:59.000Z

222

Inhomogeneous primordial nucleosynthesis and new abundance constraints on {Omega}{sub b}h{sup 2}  

DOE Green Energy (OSTI)

We discuss the upper limit to the baryonic contribution to the closure density. We consider effects of new observational and theoretical uncertainties in the primordial light element abundances, and the effects of fluctuation geometry on the inhomogeneous nucleosynthesis yields. We also consider implications of the possible detection of a high D/H abundance in a Lyman-{alpha} absorption cloud at high redshift and the implied chemical evolution effects of a high deuterium abundance. We show that there exists a region of the parameter space for inhomogeneous models in which a somewhat higher baryonic contribution to the closure density is possible than that allowed in standard homogeneous models. This result is contrary to some other recent studies and is due to both geometry and recently revised uncertainties in primordial light-element abundances, particularly {sup 7}Li. We find that the presently adopted abundance constraints are consistent with a contribution of baryons to the closure density as high as {Omega}{sub b}h{sub 50}{sup 2} {le} 0.11 ({eta} {le} 7 {times} 10{sup {minus}10}). This corresponds to a 20% increase over the limit from standard homogeneous models ({Omega}{sub b}h{sub 50}{sup 2} {le} 0.08, {eta} {le} 5.8 {times} 10{sup {minus}10}). With a high deuterium abundance the upper limits for the inhomogeneous and homogeneous models would be {Omega}{sub b}h{sub 50}{sup 2} {le} 0.04 and 0.03 ({eta} {le} 2.6 {times} 10{sup {minus}10} and 1.9 {times} 10{sup {minus}10}), respectively. Even higher limits could be obtained by further relaxing the presently accepted primordial lithium abundance constraint as some have proposed.

Mathews, G.J. [Notre Dame Univ., IN (United States). Dept. of Physics]|[Lawrence Livermore National Lab., CA (United States)]|[National Astronomical Observatory of Japan, Tokyo (Japan); Kajino, T.; Orito, M. [National Astronomical Observatory of Japan, Tokyo (Japan)

1995-07-20T23:59:59.000Z

223

Constraints on the correlation between QSO luminosity and host halo mass from high-redshift quasar clustering  

E-Print Network (OSTI)

Recent measurements of high-redshift QSO clustering from the Sloan Digital Sky Survey indicate that QSOs at z~4 have a bias b~14. We find that this extremely high clustering amplitude, combined with the corresponding space density, constrains the dispersion in the L-Mhalo relation to be less than 50% at 99% confidence for the most conservative case of a 100% duty cycle. This upper limit to the intrinsic dispersion provides as strong a constraint as current upper limits to the intrinsic dispersion in the local M_BH-sigma relation and the ratio of bolometric to Eddington luminosity of luminous QSOs.

Martin White; Paul Martini; J. D. Cohn

2007-11-26T23:59:59.000Z

224

Fixing variable values in the capacitated facility location problem through pairing and surrogate constraint analysis  

Science Conference Proceedings (OSTI)

The Osorio and Glover (2003) use of dual surrogate analysis is exploited to fix variables in capacitated facility location problems (CFLP). The surrogate constraint is obtained by weighting the original problem constraints by their associated dual values ... Keywords: capacitated facility location problem, constraint pairing, duality, surrogate constraints

Maria A. Osorio; Abraham Sánchez

2009-06-01T23:59:59.000Z

225

Strong Upper Limits on Sterile Neutrino Warm Dark Matter  

Science Conference Proceedings (OSTI)

Sterile neutrinos are attractive dark matter candidates. Their parameter space of mass and mixing angle has not yet been fully tested despite intensive efforts that exploit their gravitational clustering properties and radiative decays. We use the limits on gamma-ray line emission from the Galactic center region obtained with the SPI spectrometer on the INTEGRAL satellite to set new constraints, which improve on the earlier bounds on mixing by more than 2 orders of magnitude, and thus strongly restrict a wide and interesting range of models.

Yueksel, Hasan [Department of Physics, Ohio State University, Columbus, Ohio 43210 (United States); Center for Cosmology and Astro-Particle Physics, Ohio State University, Columbus, Ohio 43210 (United States); Beacom, John F. [Department of Physics, Ohio State University, Columbus, Ohio 43210 (United States); Center for Cosmology and Astro-Particle Physics, Ohio State University, Columbus, Ohio 43210 (United States); Department of Astronomy, Ohio State University, Columbus, Ohio 43210 (United States); Watson, Casey R. [Department of Physics and Astronomy, Millikin University, Decatur, Illinois 62522 (United States)

2008-09-19T23:59:59.000Z

226

Dark energy constraints from a space-based supernova survey  

E-Print Network (OSTI)

We present a forecast of dark energy constraints that could be obtained from a large sample of distances to Type Ia supernovae detected and measured from space. We simulate the supernova events as they would be observed by a EUCLID-like telescope with its two imagers, assuming those would be equipped with 4 visible and 3 near infrared swappable filters. We account for known systematic uncertainties affecting the cosmological constraints, including those arising through the training of the supernova model used to fit the supernovae light curves. Using conservative assumptions and Planck priors, we find that a 18 month survey would yield constraints on the dark energy equation of state comparable to the cosmic shear approach in EUCLID: a variable two-parameter equation of state can be constrained to ~0.03 at z~0.3. These constraints are derived from distances to about 13,000 supernovae out to z=1.5, observed in two cones of 10 and 50 deg^2. These constraints do not require measuring a nearby supernova sample fr...

Astier, P; Pain, R; Balland, C

2010-01-01T23:59:59.000Z

227

Mass Transfer Constraints On The Chemical Evolution Of An Active  

Open Energy Info (EERE)

Mass Transfer Constraints On The Chemical Evolution Of An Active Mass Transfer Constraints On The Chemical Evolution Of An Active Hydrothermal System, Valles Caldera, New Mexico Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Mass Transfer Constraints On The Chemical Evolution Of An Active Hydrothermal System, Valles Caldera, New Mexico Details Activities (4) Areas (2) Regions (0) Abstract: Partial equilibrium conditions occur between fluids and secondary minerals in the Valles hydrothermal system, contained principally in the Tertiary rhyolitic Bandelier Tuff. The mass transfer processes are governed by reactive phase compositions, surface areas, water-rock ratios, reaction rates, and fluid residence times. Experimental dissolution of the vitric phase of the tuff was congruent with respect to Cl in the solid and

228

Geologic and thermochronologic constraints on the initial orientation of  

Open Energy Info (EERE)

and thermochronologic constraints on the initial orientation of and thermochronologic constraints on the initial orientation of the Raft River detachment and footwall shear zone Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Conference Proceedings: Geologic and thermochronologic constraints on the initial orientation of the Raft River detachment and footwall shear zone Details Activities (2) Areas (1) Regions (0) Abstract: The Raft River Mountains of northwestern Utah expose a detachment fault that separates a hanging wall of Paleozoic rocks from Proterozoic and Archean rocks of the footwall. Beneath the detachment lies a 100 to 300m-thick top-to-the-east extensional shear zone. Geologic mapping, strain and kinematic analysis, and 40Ar/39 Ar thermochronology suggest that the shear zone and detachment fault had an initial low-angle regional

229

Recombining WMAP: constraints on ionizing and resonance radiation at recombination  

E-Print Network (OSTI)

We place new constraints on sources of ionizing and resonance radiation at the epoch of the recombination process using the recent CMB temperature and polarization spectra coming from WMAP. We find that non-standard recombination scenarios are still consistent with the current data. In light of this we study the impact that such models can have on the determination of several cosmological parameters. In particular, the constraints on curvature and baryon density appear to be weakly affected by a modified recombination scheme. However, it may affect the current WMAP constraints on inflationary parameters like the spectral index and its running. Physically motivated models, like those based on primordial black hole or super heavy dark matter decay, are able to provide a good fit to the current data. Future observations in both temperature and polarization will be needed to more stringently test these models.

Rachel Bean; Alessandro Melchiorri; Joe Silk

2003-06-18T23:59:59.000Z

230

Cosmological and astrophysical constraints on superconducting cosmic strings  

E-Print Network (OSTI)

We investigate the cosmological and astrophysical constraints on superconducting cosmic strings (SCSs). SCS loops emit strong bursts of electromagnetic waves, which might affect various cosmological and astrophysical observations. We take into account the effect on the CMB anisotropy, CMB blackbody spectrum, BBN, observational implications on radio wave burst and X-ray or gamma-ray events, and stochastic gravitational wave background measured by pulsar timing experiments. We then derive constraints on the parameters of SCS from current observations and estimate prospects for detecting SCS signatures in on-going observations. As a result, we find that these constraints exclude broad parameter regions, and also that on-going radio wave observations can probe large parameter space.

Koichi Miyamoto; Kazunori Nakayama

2012-12-30T23:59:59.000Z

231

From the Lab to the Marketplace. . .  

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

DOE bases mandatory standards that now apply to all major U.S. appliances and residential space-conditioning systems. In addition to technology-oriented research, the LBL program...

232

Marketplace Assessment – Metric Labeling on Packages in ...  

Science Conference Proceedings (OSTI)

... Harbor Freight Devcon 5 Minute Epoxy 2 ITW Performance Riviera Beach, FL 1 net ... Harbor Freight Aquapel Glass Treatment 2 PPG Industries, Inc. ...

2010-07-27T23:59:59.000Z

233

Timber Products Equipment Services MarketPlace  

E-Print Network (OSTI)

. The 400-acre tract already includes a biomass power plant that Ainsworth used to generate its own power on local job development and "thoughtful use of the region's resources," according to Mark Doctor, a member are interested in using a portion of the facility for some form of biomass. Other potential tenants could include

234

NCAI 70th Annual Convention and Marketplace  

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

Experience six days of educational breakout sessions, discussions, events, and cultural celebrations, all organized with the purpose of engaging Indian Country in the National Congress of American...

235

Argonne in the marketplace: Ultrananocrystalline diamond | Argonne...  

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

AVAILABLE FOR LICENSING Many more Argonne innovations are available for licensing. Here's just a few: Cleaner diesel emissions The diesel DeNOx catalyst removes 80-85% of nitrogen...

236

Marketplaces for data: an initial survey  

Science Conference Proceedings (OSTI)

Data is becoming more and more of a commodity, so that it is not surprising that data has reached the status of tradable goods. An increasing number of data providers is recognizing this and is consequently setting up platforms for selling, buying, or ...

Fabian Schomm; Florian Stahl; Gottfried Vossen

2013-05-01T23:59:59.000Z

237

Fossil energy: From laboratory to marketplace  

Science Conference Proceedings (OSTI)

The purpose of this work is to provide a summary description of the role of advanced research in the overall Fossil Energy R D program successes. It presents the specific Fossil Energy advanced research products that have been adopted commercially or fed into other R D programs as part of the crosscutting enabling technology base upon which advanced systems are based.

Not Available

1992-03-01T23:59:59.000Z

238

Regional Branding in a Global Marketplace  

E-Print Network (OSTI)

are formed anew with each host generation by ambient bacteria that trade soil or seawater for a nutrient sorter, cells were labelled by incubation for 20 min in a solution of 1.0 mg tetramethylrhodamine was then measured using an Altra fluorescence-activated cell sorter (Beckman-Coulter) equipped with an argon laser

Castillo, Steven P.

239

COMMENTARY:Limits to adaptation  

SciTech Connect

An actor-centered, risk-based approach to defining limits to social adaptation provides a useful analytic framing for identifying and anticipating these limits and informing debates over society s responses to climate change.

Preston, Benjamin L [ORNL

2013-01-01T23:59:59.000Z

240

Relativistic Constraints on the Structure of Fundamental Forces  

E-Print Network (OSTI)

It is proved that Special Relativity imposes constraints on the structure of fundamental forces. The orthogonality of the 4-force exerted on an elementary particle and its 4-velocity is discussed. The significance of the energy-momentum tensor associated with the field is analyzed. Relying on these issues, it is proved that the Lorentz force is consistent with all constraints whereas a force derived from a scalar potential does not satisfy all requirements. This analysis explains a general discussion of Goldstein, Poole and Safko.

E. Comay

2005-03-02T23:59:59.000Z

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


241

Indirect Charged Higgs Constraints from BaBar  

SciTech Connect

The high-statistics data samples from the BABAR and Belle B-Factory experiments provide stringent constraints on charged Higgs bosons within the context of specific New Physics models. These constraints are obtained by comparing Standard Model predictions with experimental observations in rare B decays with potential sensitivity to contributions mediated by a virtual H{sup {+-}} in tree or loop diagrams. Recent experimental results on the decays B{sup +} {yields} {mu}{sup +}{nu}, B{sup +} {yields} {tau}{sup +}{nu} and inclusive B {yields} X{sub s}{gamma} are described and the implications of these measurements for charged Higgs bosons is discussed.

Robertson, Steven H.; /McGill U.

2011-09-14T23:59:59.000Z

242

Unparticle effects on unitarity constraints from Higgs boson scattering  

Science Conference Proceedings (OSTI)

We study the effects of two-body Higgs boson scattering by exchanging unparticles. The unparticle contribution can change the standard model prediction for two-body Higgs boson scattering partial wave amplitude significantly leading to modification of the unitarity constraint on the standard model Higgs boson mass. For unparticle dimension d{sub U} between 1 and 2, the unitarity constraint on the Higgs boson mass can be larger than that in the standard model. Information on unparticle interaction can also be obtained.

He Xiaogang; Wen Chungcheng [Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei, Taiwan (China)

2008-07-01T23:59:59.000Z

243

Gamma Ray Burst Constraints on Ultraviolet Lorentz Invariance Violation  

E-Print Network (OSTI)

We present a unified general formalism for ultraviolet Lorentz invariance violation (LV) testing through electromagnetic wave propagation, based on both dispersion and rotation measure data. This allows for a direct comparison of the efficacy of different data to constrain LV. As an example we study the signature of LV on the rotation of the polarization plane of $\\gamma$-rays from gamma ray bursts in a LV model. Here $\\gamma$-ray polarization data can provide a strong constraint on LV, 13 orders of magnitude more restrictive than a potential constraint from the rotation of the cosmic microwave background polarization proposed by Gamboa, L\\'{o}pez-Sarri\\'{o}n, and Polychronakos (2006).

Tina Kahniashvili; Grigol Gogoberidze; Bharat Ratra

2006-07-04T23:59:59.000Z

244

Limitations on Carry Lookahead Networks  

Science Conference Proceedings (OSTI)

The fan-in and fan-out limitations imposed by specific gate circuits force corresponding limits-upon the sizes of carry lookahead circuits fabricated from those gates. The relationships between those limits are derived, providing simple formulae that ... Keywords: high-speed arithmetic, Binary addition, carry lookahead

T. Rhyne

1984-04-01T23:59:59.000Z

245

Gamma-ray constraints on dark-matter annihilation to electroweak gauge and Higgs bosons  

E-Print Network (OSTI)

Dark-matter annihilation into electroweak gauge and Higgs bosons results in $\\gamma$-ray emission. We use observational upper limits on the fluxes of both line and continuum $\\gamma$-rays from the Milky Way Galactic Center and from Milky Way dwarf companion galaxies to set exclusion limits on allowed dark-matter masses. (Generally, Galactic Center $\\gamma$-ray line search limits from the Fermi-LAT and the H.E.S.S. experiments are most restrictive.) Our limits apply under the following assumptions: a) the dark matter species is a cold thermal relic with present mass density equal to the measured dark-matter density of the universe; b) dark-matter annihilation to standard-model particles is described in the non-relativistic limit by a single effective operator ${\\cal O} \\propto J_{DM}\\cdot J_{SM}$, where $J_{DM}$ is a standard-model singlet current consisting of dark-matter fields (Dirac fermions or complex scalars), and $J_{SM}$ is a standard-model singlet current consisting of electroweak gauge and Higgs bosons; and c) the dark-matter mass is in the range 5 GeV to 20 TeV. We consider, in turn, the 34 possible operators with mass dimension 8 or lower with non-zero s-wave annihilation channels satisfying the above assumptions. Our limits are presented in a large number of figures, one for each of the 34 possible operators; these limits can be grouped into 13 classes determined by the field content and structure of the operators. We also identify three classes of operators (coupling to the Higgs and $SU(2)_L$ gauge bosons) that can supply a 130 GeV line with the desired strength to fit the putative line signal in Fermi data, while saturating the relic density and satisfying all other indirect constraints we consider.

Michael A. Fedderke; Edward W. Kolb; Tongyan Lin; Lian-Tao Wang

2013-10-22T23:59:59.000Z

246

URANIUM-SERIES CONSTRAINTS ON RADIONUCLIDE TRANSPORT AND GROUNDWATER FLOW AT NOPAL I URANIUM DEPOSIT, SIERRA PENA BLANCA, MEXICO  

Science Conference Proceedings (OSTI)

Uranium-series data for groundwater samples from the vicinity of the Nopal I uranium ore deposit are used to place constraints on radionuclide transport and hydrologic processes at this site, and also, by analogy, at Yucca Mountain. Decreasing uranium concentrations for wells drilled in 2003 suggest that groundwater flow rates are low (uranium isotopic constraints also suggest that groundwater flow and mixing is limited at this site. The uranium isotopic systematics for water collected in the mine adit are consistent with longer rock-water interaction times and higher uranium dissolution rates at the front of the adit where the deposit is located. Short-lived nuclide data for groundwater wells are used to calculate retardation factors that are on the order of 1,000 for radium and 10,000 to 10,000,000 for lead and polonium. Radium has enhanced mobility in adit water and fractures near the deposit.

S. J. Goldstein, S. Luo, T. L. Ku, and M. T. Murrell

2006-04-01T23:59:59.000Z

247

URANIUM-SERIES CONSTRAINTS ON RADIONUCLIDE TRANSPORT AND GROUNDWATER FLOW AT NOPAL I URANIUM DEPOSIT, SIERRA PENA BLANCA, MEXICO  

SciTech Connect

Uranium-series data for groundwater samples from the vicinity of the Nopal I uranium ore deposit are used to place constraints on radionuclide transport and hydrologic processes at this site, and also, by analogy, at Yucca Mountain. Decreasing uranium concentrations for wells drilled in 2003 suggest that groundwater flow rates are low (< 10 m/yr). Field tests, well productivity, and uranium isotopic constraints also suggest that groundwater flow and mixing is limited at this site. The uranium isotopic systematics for water collected in the mine adit are consistent with longer rock-water interaction times and higher uranium dissolution rates at the front of the adit where the deposit is located. Short-lived nuclide data for groundwater wells are used to calculate retardation factors that are on the order of 1,000 for radium and 10,000 to 10,000,000 for lead and polonium. Radium has enhanced mobility in adit water and fractures near the deposit.

S. J. Goldstein, S. Luo, T. L. Ku, and M. T. Murrell

2006-04-01T23:59:59.000Z

248

Limits to laser advancement: Fundamental and otherwise  

SciTech Connect

A discussion was held to address constraints affecting the advancement of laser technology and applications. Several issues were raised such as the regulatory issues of safety and standards. The thermal constraints on laser materials affecting the laser's overall efficiency etc. were also considered. The issue of scientific secrecy relative to recent advances in laser technology was also brought up. (AIP)

Guenther, A.H.

1987-09-25T23:59:59.000Z

249

Constraint Orientated Specification with CSP and Real Time Temporal Logic  

E-Print Network (OSTI)

Constraint Orientated Specification with CSP and Real Time Temporal Logic Justin Pearson Department Processes (CSP) [Hoa85] and a version of Propositional Temporal Logic (PTL), derived from [Eme90]. CSP. The behaviour of a CSP process is dependent on its environment; it is therefore difficult to assert global

Kent, University of

250

Verification of temporal scheduling constraints in clinical practice guidelines  

Science Conference Proceedings (OSTI)

The computerization of clinical practice guidelines is a significant scientific challenge for the medical informatics community. One frequently reported factor hindering this objective is the existence of deficiencies within guideline knowledge. In this ... Keywords: Clinical practice guidelines, Medical plan management, Temporal constraint satisfaction, Verification

Georg Duftschmid; Silvia Miksch; Walter Gall

2002-06-01T23:59:59.000Z

251

An optimum robot path planning with payload constraints  

Science Conference Proceedings (OSTI)

This paper presents a general methodology for the off-line planning of optimal trajectory of robot manipulators by taking into account the grasping forces in the manipulator gripper. The mechanical energy of the actuators has been considered for the ... Keywords: Path planning, Payload constraints, Programming, Robotics

Sezimaria F. P. Saramago; Marco Ceccarelli

2002-07-01T23:59:59.000Z

252

Constraints on Dark Energy Models from Weak Gravity Conjecture  

E-Print Network (OSTI)

We study the constraints on the dark energy model with constant equation of state parameter $w=p/\\rho$ and the holographic dark energy model by using the weak gravity conjecture. The combination of weak gravity conjecture and the observational data gives $wenergy model realized by a scalar field is in swampland.

Chen, Ximing; Gong, Yungui

2008-01-01T23:59:59.000Z

253

Constraints on Dark Energy Models from Weak Gravity Conjecture  

E-Print Network (OSTI)

We study the constraints on the dark energy model with constant equation of state parameter $w=p/\\rho$ and the holographic dark energy model by using the weak gravity conjecture. The combination of weak gravity conjecture and the observational data gives $wenergy model realized by a scalar field is in swampland.

Ximing Chen; Jie Liu; Yungui Gong

2008-06-15T23:59:59.000Z

254

Control of systems integrating logic, dynamics, and constraints  

Science Conference Proceedings (OSTI)

This paper proposes a framework for modeling and controlling systems described by interdependent physical laws, logic rules, and operating constraints, denoted as mixed logical dynamical (MLD) systems. These are described by linear dynamic equations ... Keywords: Binary logic systems, Boolean logic, Dynamic models, Hybrid systems, Mixed-integer programming, Optimization problems, Predictive control

Alberto Bemporad; Manfred Morari

1999-03-01T23:59:59.000Z

255

Constraint structure of the three dimensional massive gravity  

Science Conference Proceedings (OSTI)

Constraint analysis of the three-dimensional massive gravity, the so-called new massive gravity, is studied in the Palatini formalism. We show that amongst 6 components of the metric, 2 are dynamical, which is compatible with the existence of one vector massive graviton in the linearized theory (Fierz-Pauli theory).

Sadegh, M.; Shirzad, A. [Department of Physics, Isfahan University of Technology , P.O.Box 84156-83111, Isfahan (Iran, Islamic Republic of); School of Physics, Institute for Research in Fundamental Sciences (IPM), P.O.Box 19395-5531, Tehran (Iran, Islamic Republic of)

2011-04-15T23:59:59.000Z

256

Optimal consumption and investment in incomplete markets with general constraints  

E-Print Network (OSTI)

We study an optimal consumption and investment problem in a possibly incomplete market with general, not necessarily convex, stochastic constraints. We give explicit solutions for investors with exponential, logarithmic and power utility. Our approach is based on martingale methods which rely on recent results on the existence and uniqueness of solutions to BSDEs with drivers of quadratic growth.

Cheridito, Patrick

2010-01-01T23:59:59.000Z

257

JOINT BOX-CONSTRAINT AND DEREGULARIZATION IN MULTIUSER Y. Zakharov  

E-Print Network (OSTI)

JOINT BOX-CONSTRAINT AND DEREGULARIZATION IN MULTIUSER DETECTION Y. Zakharov , J. Luo , and C- ciation (PDA) detectors. We propose a novel iterative multiuser de- tection technique based on joint technique is based on joint deregularized and box-constrained solution to quadratic op- timization

258

Dynamical constraints on monsoon circulations R. Alan Plumb  

E-Print Network (OSTI)

Dynamical constraints on monsoon circulations R. Alan Plumb Dept. of Earth, Atmospheric and Planetary Sciences Massachusetts Institute of Technology August 17, 2005 Abstract Monsoon circulations on monsoon circulations, a comprehensive theory of their dynamics is still lacking. It is clear that, given

259

Thermal Unit Commitment Including Optimal AC Power Flow Constraints  

E-Print Network (OSTI)

Thermal Unit Commitment Including Optimal AC Power Flow Constraints Carlos Murillo{Sanchez Robert J algorithm for unit commitment that employs a Lagrange relaxation technique with a new augmentation. This framework allows the possibility of committing units that are required for the VArs that they can produce

260

Measuring the expected gain of communicating constraint information  

Science Conference Proceedings (OSTI)

In this paper we investigate methods for measuring the expected utility from communicating information in multi-agent planning and scheduling problems. We consider an environment where human teammates can potentially add information to relax constraint ... Keywords: Multiagent scheduling, adaptive coordination, localized decisions

Avi Rosenfeld; Sarit Kraus; Charles L. Ortiz, Jr.

2009-12-01T23:59:59.000Z

Note: This page contains sample records for the topic "marketplace constraints limit" 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

Cosmological Constraints from the SDSS maxBCG Cluster Catalog  

Science Conference Proceedings (OSTI)

We use the abundance and weak lensing mass measurements of the SDSS maxBCG cluster catalog to simultaneously constrain cosmology and the richness-mass relation of the clusters. Assuming a flat {Lambda}CDM cosmology, we find {sigma}{sub 8}({Omega}{sub m}/0.25){sup 0.41} = 0.832 {+-} 0.033 after marginalization over all systematics. In common with previous studies, our error budget is dominated by systematic uncertainties, the primary two being the absolute mass scale of the weak lensing masses of the maxBCG clusters, and uncertainty in the scatter of the richness-mass relation. Our constraints are fully consistent with the WMAP five-year data, and in a joint analysis we find {sigma}{sub 8} = 0.807 {+-} 0.020 and {Omega}{sub m} = 0.265 {+-} 0.016, an improvement of nearly a factor of two relative to WMAP5 alone. Our results are also in excellent agreement with and comparable in precision to the latest cosmological constraints from X-ray cluster abundances. The remarkable consistency among these results demonstrates that cluster abundance constraints are not only tight but also robust, and highlight the power of optically-selected cluster samples to produce precision constraints on cosmological parameters.

Rozo, Eduardo; /CCAPP; Wechsler, Risa H.; /KIPAC, Menlo Park /SLAC; Rykoff, Eli S.; /UC, Santa Barbara; Annis, James T.; /Fermilab; Becker, Matthew R.; /Chicago U. /KICP, Chicago; Evrard, August E.; /Michigan U. /Michigan U., MCTP; Frieman, Joshua A.; /Fermilab /KICP, Chicago /Chicago U.; Hansen, Sarah M.; /UC, Santa Cruz; Hao, Jia; /Michigan U.; Johnston, David E.; /Northwestern U.; Koester, Benjamin P.; /KICP, Chicago /Chicago U.; McKay, Timothy A.; /Michigan U. /Michigan U., MCTP; Sheldon, Erin S.; /Brookhaven; Weinberg, David H.; /CCAPP /Ohio State U.

2009-08-03T23:59:59.000Z

262

Hierarchical clustering using correlation metric and spatial continuity constraint  

DOE Patents (OSTI)

Large data sets are analyzed by hierarchical clustering using correlation as a similarity measure. This provides results that are superior to those obtained using a Euclidean distance similarity measure. A spatial continuity constraint may be applied in hierarchical clustering analysis of images.

Stork, Christopher L.; Brewer, Luke N.

2012-10-02T23:59:59.000Z

263

Renewable Energy Scheduling for Fading Channels with Maximum Power Constraint  

E-Print Network (OSTI)

Renewable Energy Scheduling for Fading Channels with Maximum Power Constraint Zhe Wang Electrical The employment of the renewable energy source has grown from long-established concepts into devices for powering--In this paper, we develop efficient algorithm to obtain the optimal energy schedule for fading channel

Greenberg, Albert

264

Forecast Constraints on Inflation from Combined CMB and Gravitational Wave Direct Detection Experiments  

E-Print Network (OSTI)

We study how direct detection of the inflationary gravitational wave background constrains inflationary parameters and complements CMB polarization measurements. The error ellipsoids calculated using the Fisher information matrix approach with Planck and the direct detection experiment, BBO (Big Bang Observer), show different directions of parameter degeneracy, and the degeneracy is broken when they are combined. For a slow-roll parameterization, we show that BBO could significantly improve the constraints on the tensor-to-scalar ratio compared with Planck alone. We also look at a quadratic and a natural inflation model. In both cases, if the temperature of reheating is also treated as a free parameter, then the addition of BBO can significantly improve the error bars. In the case of natural inflation, we find that the addition of BBO could even partially improve the error bars of a cosmic variance-limited CMB experiment.

Sachiko Kuroyanagi; Christopher Gordon; Joseph Silk; Naoshi Sugiyama

2009-12-18T23:59:59.000Z

265

Limit Cycle and Conserved Dynamics  

E-Print Network (OSTI)

We demonstrate that a potential coexists with limit cycle. Here the potential determines the final distribution of population. Our demonstration consists of three steps: We first show the existence of limit from a typical physical sciences setting: the potential is a type of Mexican hat type, with the strength of a magnetic field scale with the strength the potential gradient near the limit cycle, and the friction goes to zero faster than the potential near the limit cycle. Hence the dynamics at the limit cycle is conserved. The diffusion matrix is nevertheless finite at the limit cycle. Secondly, we construct the potential in the dynamics with limit cycle in a typical dynamical systems setting. Thirdly, we argue that such a construction can be carried out in a more general situation based on a method discovered by one of us. This method of dealing with stochastic differential equation is in general different from both Ito and Stratonovich calculus. Our result may be useful in many related applications, such as in the discussion of metastability of limit cycle and in the construction of Hopfield potential in the neural network computation.

X. -M. Zhu; L. Yin; P. Ao

2004-12-21T23:59:59.000Z

266

FUEL CASK IMPACT LIMITER VULNERABILITIES  

Science Conference Proceedings (OSTI)

Cylindrical fuel casks often have impact limiters surrounding just the ends of the cask shaft in a typical 'dumbbell' arrangement. The primary purpose of these impact limiters is to absorb energy to reduce loads on the cask structure during impacts associated with a severe accident. Impact limiters are also credited in many packages with protecting closure seals and maintaining lower peak temperatures during fire events. For this credit to be taken in safety analyses, the impact limiter attachment system must be shown to retain the impact limiter following Normal Conditions of Transport (NCT) and Hypothetical Accident Conditions (HAC) impacts. Large casks are often certified by analysis only because of the costs associated with testing. Therefore, some cask impact limiter attachment systems have not been tested in real impacts. A recent structural analysis of the T-3 Spent Fuel Containment Cask found problems with the design of the impact limiter attachment system. Assumptions in the original Safety Analysis for Packaging (SARP) concerning the loading in the attachment bolts were found to be inaccurate in certain drop orientations. This paper documents the lessons learned and their applicability to impact limiter attachment system designs.

Leduc, D; Jeffery England, J; Roy Rothermel, R

2009-02-09T23:59:59.000Z

267

Offline count-limited certificates  

Science Conference Proceedings (OSTI)

In this paper, we present the idea of offline count-limited certificates (or clics for short), and show how these can be implemented using minimal trusted hardware functionality already widely available today. Offline count-limited ... Keywords: authentication, offline payments, smartcards, trusted platform module (TPM)

Luis F. G. Sarmenta; Marten van Dijk; Jonathan Rhodes; Srinivas Devadas

2008-03-01T23:59:59.000Z

268

A first step in the design of a formally verified constraint-based testing tool: focaltest  

Science Conference Proceedings (OSTI)

Constraint-based test data generators rely on SMT or constraint solvers to automatically generate test data (e.g., Pex, Sage, Gatel, PathCrawler, Euclide). However, for some test data generation requests corresponding to particular test objectives, these ...

Matthieu Carlier; Catherine Dubois; Arnaud Gotlieb

2012-05-01T23:59:59.000Z

269

Adaptive Vision and Force Tracking Control for Robots With Constraint Uncertainty  

E-Print Network (OSTI)

In force control applications of robots, it is difficult to obtain an exact model of a constraint surface. In presence of the constraint uncertainty, the robot needs to adapt to the uncertainty in external parameters due ...

Cheah, Chien Chern

270

Synchronization in Vehicle Routing---A Survey of VRPs with Multiple Synchronization Constraints  

Science Conference Proceedings (OSTI)

This paper presents a survey of vehicle routing problems with multiple synchronization constraints. These problems exhibit, in addition to the usual task covering constraints, further synchronization requirements between the vehicles, concerning spatial, ... Keywords: coordination, survey, synchronization, trailer, transshipment, vehicle routing

Michael Drexl

2012-08-01T23:59:59.000Z

271

Runtime Monitoring of Timing Constraints in Distributed Real-Time Systems  

E-Print Network (OSTI)

. Embedded real-time systems often operate under strict timing and dependability constraints. To ensure responsiveness, these systems must be able to provide the expected services in a timely manner even in the presence of faults. In this paper, we describe a run-time environment for monitoring of timing constraints in distributed real-time systems. In particular, we focus on the problem of detecting violations of timing assertions in an environment in which the real-time tasks run on multiple processors, and timing constraints can be either inter-processor or intra-processor constraints. Constraint violations are detected at the earliest possible time by deriving and checking intermediate constraints from the user-specified constraints. If the violations must be detected as early as possible, then the problem of minimizing the number of messages to be exchanged between the processors becomes intractable. We characterize a sub-class of timing constraints that occur commonly in distribu...

Farnam Jahanian; Ragunathan Rajkumar; Sitaram C. V. Raju

1994-01-01T23:59:59.000Z

272

PROBING THE INFLATON: SMALL-SCALE POWER SPECTRUM CONSTRAINTS FROM MEASUREMENTS OF THE COSMIC MICROWAVE BACKGROUND ENERGY SPECTRUM  

Science Conference Proceedings (OSTI)

In the early universe, energy stored in small-scale density perturbations is quickly dissipated by Silk damping, a process that inevitably generates {mu}- and y-type spectral distortions of the cosmic microwave background (CMB). These spectral distortions depend on the shape and amplitude of the primordial power spectrum at wavenumbers k {approx}window functions that account for the effects of thermalization and dissipation physics. We show that COBE/FIRAS places a robust upper limit on the amplitude of the small-scale power spectrum. This limit is about three orders of magnitude stronger than the one derived from primordial black holes in the same scale range. Furthermore, this limit could be improved by another three orders of magnitude with PIXIE, potentially opening up a new window to early universe physics. To illustrate the power of these constraints, we consider several generic models for the small-scale power spectrum predicted by different inflation scenarios, including running-mass inflation models and inflation scenarios with episodes of particle production. PIXIE could place very tight constraints on these scenarios, potentially even ruling out running-mass inflation models if no distortion is detected. We also show that inflation models with sub-Planckian field excursion that generate detectable tensor perturbations should simultaneously produce a large CMB spectral distortion, a link that could potentially be established with PIXIE.

Chluba, Jens; Erickcek, Adrienne L.; Ben-Dayan, Ido, E-mail: jchluba@cita.utoronto.ca [Canadian Institute for Theoretical Astrophysics, 60 St. George Street, Toronto, Ontario M5S 3H8 (Canada)

2012-10-20T23:59:59.000Z

273

Unit Commitment Considering Generation Flexibility and Environmental Constraints  

Science Conference Proceedings (OSTI)

This paper proposes a new framework for power system unit commitment process, which incorporates the generation flexibility requirements and environmental constraints into the existing unit commitment algorithm. The generation flexibility requirements are to address the uncertainties with large amount of intermittent resources as well as with load and traditional generators, which causes real-time balancing requirements to be variable and less predictable. The proposed flexibility requirements include capacity, ramp and ramp duration for both upward and downward balancing reserves. The environmental constraints include emission allowance for fossil fuel-based generators and ecological regulations for hydro power plants. Calculation of emission rates is formulated. Unit commitment under this new framework will be critical to the economic and reliable operation of the power grid and the minimization of its negative environmental impacts, especially when high penetration levels of intermittent resources are being approached, as required by the renewable portfolio standards in many states.

Lu, Shuai; Makarov, Yuri V.; Zhu, Yunhua; Lu, Ning; Prakash Kumar, Nirupama; Chakrabarti, Bhujanga B.

2010-07-31T23:59:59.000Z

274

Planning for environmental constraints on the PJM system  

Science Conference Proceedings (OSTI)

This chapter provides a snapshot of the existing PJM system and identifies the environmental constraints that form the parameters for the regional approaches analyzed in this study. The chapter begins with a description of the PJM system and the costs and emissions levels of the pollutants under study associated with the reference case (the PJM system configured to meet only Clean Air Act Amendment Phase I SO{sub 2} requirements and the March 1994 NO{sub x} requirements affecting Phase I units){sup 3}. Next, the pollution-reduction scenario assumed for the purpose of the study, which covers the period 1995--2010, is described. Finally, the impacts of this pollution reduction scenario -- emissions that would need to be avoided on the reference case PJM system -- are identified. Modeling methods are described alongside the study`s results. Other chapters discuss: environmental constraints, alternate plans to achieve environmental goals, and comparison of alternate plans.

Not Available

1994-07-15T23:59:59.000Z

275

Solar System Constraints on Gauss-Bonnet Mediated Dark Energy  

E-Print Network (OSTI)

Although the Gauss-Bonnet term is a topological invariant for general relativity, it couples naturally to a quintessence scalar field, modifying gravity at solar system scales. We determine the solar system constraints due to this term by evaluating the post-Newtonian metric for a distributional source. We find a mass dependent, 1/r^7 correction to the Newtonian potential, and also deviations from the Einstein gravity prediction for light-bending. We constrain the parameters of the theory using planetary orbits, the Cassini spacecraft data, and a laboratory test of Newton's law, always finding extremely tight bounds on the energy associated to the Gauss-Bonnet term. We discuss the relevance of these constraints to late-time cosmological acceleration.

Luca Amendola; Christos Charmousis; Stephen C. Davis

2007-04-02T23:59:59.000Z

276

Compact location problems with budget and communication constraints  

SciTech Connect

The authors consider the problem of placing a specified number p of facilities on the nodes of a given network with two nonnegative edge-weight functions so as to minimize the diameter of the placement with respect to the first weight function subject to a diameter or sum-constraint with respect to the second weight function. Define an ({alpha}, {beta})-approximation algorithm as a polynomial-time algorithm that produces a solution within {alpha} times the optimal value with respect to the first weight function, violating the constraint with respect to the second weight function by a factor of at most {beta}. They show that in general obtaining an ({alpha}, {beta})-approximation for any fixed {alpha}, {beta} {ge} 1 is NP-hard for any of these problems. They also present efficient approximation algorithms for several of the problems studied, when both edge-weight functions obey the triangle inequality.

Krumke, S.O.; Noltemeier, H. [Univ. of Wuerzburg (Germany); Ravi, S.S. [State Univ. of New York, Albany, NY (United States); Marathe, M.V. [Los Alamos National Lab., NM (United States)

1995-07-01T23:59:59.000Z

277

How does the chromatin fiber deal with topological constraints?  

E-Print Network (OSTI)

In the nuclei of eukaryotic cells, DNA is packaged through several levels of compaction in an orderly retrievable way that enables the correct regulation of gene expression. The functional dynamics of this assembly involves the unwinding of the so-called 30 nm chromatin fiber and accordingly imposes strong topological constraints. We present a general method for computing both the twist and the writhe of any winding pattern. An explicit derivation is implemented for the chromatin fiber which provides the linking number of DNA in eukaryotic chromosomes. We show that there exists one and only one unwinding path which satisfies both topological and mechanical constraints that DNA has to deal with during condensation/decondensation processes.

Maria Barbi; Julien Mozziconacci; Jean-Marc Victor

2004-04-26T23:59:59.000Z

278

Precision Electroweak Measurements and Constraints on the Standard Model  

Science Conference Proceedings (OSTI)

This note presents constraints on Standard Model parameters using published and preliminary precision electroweak results measured at the electron-positron colliders LEP and SLC. The results are compared with precise electroweak measurements from other experiments, notably CDF and D0 at the Tevatron. Constraints on the input parameters of the Standard Model are derived from the results obtained in high-Q{sup 2} interactions, and used to predict results in low-Q{sup 2} experiments, such as atomic parity violation, Moller scattering, and neutrino-nucleon scattering. The main changes with respect to the experimental results presented in 2007 are new combinations of results on the W-boson mass and width and the mass of the top quark.

Not Available

2011-11-11T23:59:59.000Z

279

Solar System Constraints on Gauss-Bonnet Dark Energy  

E-Print Network (OSTI)

Quadratic curvature Gauss-Bonnet gravity may be the solution to the dark energy problem, but a large coupling strength is required. This can lead to conflict with laboratory and planetary tests of Newton's law, as well as light bending. The corresponding constraints are derived. If applied directly to cosmological scales, the resulting bound on the density fraction is |Omega_GB| < 3.6 x 10^-32.

Stephen C. Davis

2007-08-15T23:59:59.000Z

280

Building a wireless network infrastructure under budget constraints  

Science Conference Proceedings (OSTI)

This paper examines wireless networking and provides a case study of a wireless network infrastructure's development at an urban university of 11,000 students. The University of Houston Downtown (UHD) incorporated wireless technology to help ... Keywords: budget constraints, case study, curricula-related products, e-learning, higher education, m-learning, mobile communications, mobile learning, mobile technology, urban university, wireless communications, wireless network infrastructure, wireless networks

Richard A. McMahon; Peter D. DeVries; P. Pete Chong

2005-12-01T23:59:59.000Z

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


281

Energy-Efficient Transmission Scheduling with Strict Underflow Constraints  

E-Print Network (OSTI)

We consider a single source transmitting data to a single receiver/user over a wireless channel. The channel is time-varying, and the user has a buffer to store received packets before they are drained. At each time step, the source determines how much power to use for transmission. The objective of the source is to allocate power in a manner that minimizes an expected cost measure, while satisfying strict buffer underflow constraints and a total power constraint in each slot. The expected cost measure is composed of costs associated with power consumption from transmission and packet holding costs. The primary application motivating this problem is wireless media streaming. For this application, the buffer underflow constraints prevent the user buffer from emptying, so as to maintain playout quality. We show that a modified base-stock policy is optimal under the finite and infinite horizon discounted expected cost criteria. For a special case, we present the sequences of critical numbers that complete the ch...

Shuman, David I

2009-01-01T23:59:59.000Z

282

A grammar-driven knowledge acquisition tool that incorporates constraint propagation  

Science Conference Proceedings (OSTI)

To acquire knowledge that is fit for a specific purpose, it is very desirable to have a structured, declarative expression of the knowledge that is needed. This paper introduces a stand-alone knowledge acquisition tool, called COCKATOO (Constraint-Capable ... Keywords: SCREAMER+, constraint-augmented grammars, constraints, formal grammars, knowledge acquisition

Simon White; Derek Sleeman

2001-10-01T23:59:59.000Z

283

A Methodology for Handling Complex Functional Constraints for Large Industrial Designs  

Science Conference Proceedings (OSTI)

Functional constraints capture Boolean relationships among signal nets by analyzing the functionality of a circuit. Such constraints find widespread application in VLSI design methodology and can be derived using various techniques. The size and complexity ... Keywords: Functional constraints, Pseudo-functional tests, Untestability analysis

Abhijit Jas; Yi-Shing Chang; Sreejit Chakravarty

2008-06-01T23:59:59.000Z

284

Constraints to leasing and development of federal resources: OCS oil and gas and geothermal. Final report  

DOE Green Energy (OSTI)

Chapter I identifies possible technological, economic, and environmental constraints to geothermal resource development. Chapter II discusses constraints relative to outer continental shelf and geothermal resources. General leasing information for each resource is detailed. Chapter III summarizes the major studies relating to development constraints. 37 refs. (PSB)

Not Available

1982-01-01T23:59:59.000Z

285

Unicast and multicast QoS routing with soft-constraint logic programming  

Science Conference Proceedings (OSTI)

We present a formal model to represent and solve the unicast/multicast routing problem in networks with quality-of-service (QoS) requirements. To attain this, first we translate the network adapting it to a weighted graph (unicast) or and-or ... Keywords: Constraints, Quality of Service (QoS), constraint logic programming (CLP), preferences, routing, soft constraints

Stefano Bistarelli; Ugo Montanari; Francesca Rossi; Francesco Santini

2010-10-01T23:59:59.000Z

286

Passive fault current limiting device  

DOE Patents (OSTI)

A passive current limiting device and isolator is particularly adapted for use at high power levels for limiting excessive currents in a circuit in a fault condition such as an electrical short. The current limiting device comprises a magnetic core wound with two magnetically opposed, parallel connected coils of copper, a high temperature superconductor or other electrically conducting material, and a fault element connected in series with one of the coils. Under normal operating conditions, the magnetic flux density produced by the two coils cancel each other. Under a fault condition, the fault element is triggered to cause an imbalance in the magnetic flux density between the two coils which results in an increase in the impedance in the coils. While the fault element may be a separate current limiter, switch, fuse, bimetal strip or the like, it preferably is a superconductor current limiter conducting one-half of the current load compared to the same limiter wired to carry the total current of the circuit. The major voltage during a fault condition is in the coils wound on the common core in a preferred embodiment. 6 figs.

Evans, D.J.; Cha, Y.S.

1999-04-06T23:59:59.000Z

287

Gauss-Bonnet Quintessence: Background Evolution, Large Scale Structure and Cosmological Constraints  

E-Print Network (OSTI)

We investigate a string-inspired dark energy scenario featuring a scalar field with a coupling to the Gauss-Bonnet invariant. Such coupling can trigger the onset of late dark energy domination after a scaling matter era. The universe may then cross the phantom divide and perhaps also exit from the acceleration. We discuss extensively the cosmological and astrophysical implications of the coupled scalar field. Data from the Solar system, supernovae Ia, cosmic microwave background radiation, large scale structure and big bang nucleosynthesis is used to constrain the parameters of the model. A good Newtonian limit may require to fix the coupling. With all the data combined, there appears to be some tension with the nucleosynthesis bound, and the baryon oscillation scale seems to strongly disfavor the model. These possible problems might be overcome in more elaborate models. In addition, the validity of these constraints in the present context is not strictly established. Evolution of fluctuations in the scalar field and their impact to clustering of matter is studied in detail and more model-independently. Small scale limit is derived for the perturbations and their stability is addressed. A divergence is found and discussed. The general equations for scalar perturbations are also presented and solved numerically, confirming that the Gauss-Bonnet coupling can be compatible with the observed spectrum of cosmic microwave background radiation as well as the matter power spectrum inferred from large scale surveys.

Tomi Koivisto; David F. Mota

2006-09-22T23:59:59.000Z

288

Constraints on dark matter annihilations from diffuse gamma-ray emission in the Galaxy  

E-Print Network (OSTI)

Recent advances in gamma-ray cosmic ray, infrared and radio astronomy have allowed us to develop a significantly better understanding of the galactic medium properties in the last few years. In this work using the DRAGON code, that numerically solves the CR propagation equation and calculating gamma-ray emissivities in a 2-dimensional grid enclosing the Galaxy, we study in a self consistent manner models for the galactic diffuse gamma-ray emission. Our models are cross-checked to both the available CR and gamma-ray data. We address the extend to which dark matter annihilations in the Galaxy can contribute to the diffuse gamma-ray flux towards different directions on the sky. Moreover we discuss the impact that astrophysical uncertainties of non DM nature, have on the derived gamma-ray limits. Such uncertainties are related to the diffusion properties on the Galaxy, the interstellar gas and the interstellar radiation field energy densities. Light ~10 GeV dark matter annihilating dominantly to hadrons is more strongly constrained by gamma-ray observations towards the inner parts of the Galaxy and influenced the most by assumptions of the gas distribution; while TeV scale DM annihilating dominantly to leptons has its tightest constraints from observations towards the galactic center avoiding the galactic disk plane, with the main astrophysical uncertainty being the radiation field energy density. In addition, we present a method of deriving constraints on the dark matter distribution profile from the diffuse gamma-ray spectra. These results critically depend on the assumed mass of the dark matter particles and the type of its end annihilation products.

Maryam Tavakoli; Ilias Cholis; Carmelo Evoli; Piero Ullio

2013-08-19T23:59:59.000Z

289

Ablamp Limited | Open Energy Information  

Open Energy Info (EERE)

Ablamp Limited Ablamp Limited Jump to: navigation, search Name Ablamp Limited Place Nanhai, Guangdong Province, China Sector Solar Product Manufacturer of energy-saving Compact Fluorescent Light Bulbs, solar-powered lights, LED bulbs, auto lamps and other speciality lamps. Coordinates 23.049681°, 113.173737° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":23.049681,"lon":113.173737,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

290

Solfex Limited | Open Energy Information  

Open Energy Info (EERE)

Solfex Limited Solfex Limited Jump to: navigation, search Name Solfex Limited Address Energy Arena Bannister Hall Works Off Shop Lane, Higher Walton Preston, Lancashire PR5 4DZ Place Preston, United Kingdom Sector Solar Product Solar thermal collectors Phone number 01772 312847 Website http://www.solfex.co.uk/home.h Coordinates 53.743452°, -2.64416° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":53.743452,"lon":-2.64416,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

291

Bioethanol Limited | Open Energy Information  

Open Energy Info (EERE)

Bioethanol Limited Bioethanol Limited Jump to: navigation, search Name Bioethanol Limited Place London, United Kingdom Zip SE1 7TJ Sector Renewable Energy Product Aims to develop a global renewable transport fuel business supplying primarily bioethanol but also biodiesel. Coordinates 51.506325°, -0.127144° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":51.506325,"lon":-0.127144,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

292

Renpro Limited | Open Energy Information  

Open Energy Info (EERE)

Renpro Limited Renpro Limited Jump to: navigation, search Name Renpro Limited Place London, England, United Kingdom Zip WC2N 4JF Sector Renewable Energy Product String representation "Founded in 2005 ... newable energy." is too long. Coordinates 51.506325°, -0.127144° Loading map... {"minzoom":false,"mappingservice":"googlemaps3","type":"ROADMAP","zoom":14,"types":["ROADMAP","SATELLITE","HYBRID","TERRAIN"],"geoservice":"google","maxzoom":false,"width":"600px","height":"350px","centre":false,"title":"","label":"","icon":"","visitedicon":"","lines":[],"polygons":[],"circles":[],"rectangles":[],"copycoords":false,"static":false,"wmsoverlay":"","layers":[],"controls":["pan","zoom","type","scale","streetview"],"zoomstyle":"DEFAULT","typestyle":"DEFAULT","autoinfowindows":false,"kml":[],"gkml":[],"fusiontables":[],"resizable":false,"tilt":0,"kmlrezoom":false,"poi":true,"imageoverlays":[],"markercluster":false,"searchmarkers":"","locations":[{"text":"","title":"","link":null,"lat":51.506325,"lon":-0.127144,"alt":0,"address":"","icon":"","group":"","inlineLabel":"","visitedicon":""}]}

293

Quiet planting in the locked constraints satisfaction problems  

Science Conference Proceedings (OSTI)

We study the planted ensemble of locked constraint satisfaction problems. We describe the connection between the random and planted ensembles. The use of the cavity method is combined with arguments from reconstruction on trees and first and second moment considerations; in particular the connection with the reconstruction on trees appears to be crucial. Our main result is the location of the hard region in the planted ensemble, thus providing hard satisfiable benchmarks. In a part of that hard region instances have with high probability a single satisfying assignment.

Zdeborova, Lenka [Los Alamos National Laboratory; Krzakala, Florent [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

294

Early universe constraints on time variation of fundamental constants  

SciTech Connect

We study the time variation of fundamental constants in the early Universe. Using data from primordial light nuclei abundances, cosmic microwave background, and the 2dFGRS power spectrum, we put constraints on the time variation of the fine structure constant {alpha} and the Higgs vacuum expectation value without assuming any theoretical framework. A variation in leads to a variation in the electron mass, among other effects. Along the same line, we study the variation of {alpha} and the electron mass m{sub e}. In a purely phenomenological fashion, we derive a relationship between both variations.

Landau, Susana J.; Mosquera, Mercedes E.; Scoccola, Claudia G.; Vucetich, Hector [Departamento de Fisica, FCEyN, Universidad de Buenos Aires, Ciudad Universitaria-Pabellon 1, 1428 Buenos Aires (Argentina); Facultad de Ciencias Astronomicas y Geofisicas. Universidad Nacional de La Plata, Paseo del Bosque S/N 1900 La Plata (Argentina); Facultad de Ciencias Astronomicas y Geofisicas. Universidad Nacional de La Plata, Paseo del Bosque S/N 1900 La Plata (Argentina); and Instituto de Astrofisica, Paseo del Bosque S/N 1900 La Plata (Argentina); Facultad de Ciencias Astronomicas y Geofisicas. Universidad Nacional de La Plata, Paseo del Bosque S/N 1900 La Plata (Argentina)

2008-10-15T23:59:59.000Z

295

Interactive question answering and constraint relaxation in spoken dialogue systems  

E-Print Network (OSTI)

We explore the relationship between question answering and constraint relaxation in spoken dialog systems. We develop dialogue strategies for selecting and presenting information succinctly. In particular, we describe methods for dealing with the results of database queries in informationseeking dialogs. Our goal is to structure the dialogue in such a way that the user is neither overwhelmed with information nor left uncertain as to how to refine the query further. We present evaluation results obtained from a user study involving 20 subjects in a restaurant selection task. 1

Sebastian Varges

2006-01-01T23:59:59.000Z

296

Cardiac SPECT restoration using MR-based support constraints  

Science Conference Proceedings (OSTI)

Cardiac SPECT (single photon emission computed tomography) is an important tool for evaluating heart disease in terms of diagnosis and treatment, especially for determining myocardial perfusion and thus the degree of myocardial injury. The distortion ... Keywords: MR-based support constraints, biomedical NMR, cardiac SPECT restoration, cardiac perfusion images, cardiology, defect size determination errors, heart, heart disease evaluation, image restoration, left ventricular geometry distortion, medical diagnostic imaging, medical image processing, myocardial injury degree, myocardial perfusion determination, partial volume effects, registered magnetic resonance image, single photon emission computed tomography, treatment

L. H. Staib; A. Sinusas

1995-10-01T23:59:59.000Z

297

Forecasting cosmological constraints from age of high-z galaxies  

E-Print Network (OSTI)

We perform Monte Carlo simulations based on current age estimates of high-z objects to forecast constraints on the equation of state (EoS) of the dark energy. In our analysis, we use two different EoS parameterizations, namely, the so-called CPL and its uncorrelated form and calculate the improvements on the figure of merit for both cases. Although there is a clear dependence of the FoM with the size and accuracy of the synthetic age samples, we find that the most substantial gain in FoM comes from a joint analysis involving age and baryon acoustic oscillation data.

C. A. P. Bengaly Jr.; M. A. Dantas; J. C. Carvalho; J. S. Alcaniz

2013-08-28T23:59:59.000Z

298

Constraint on the (GUT) symmetry breaking scale and topological defects  

Science Conference Proceedings (OSTI)

In F-term supergravity inflation models, scalar fields other than the inflaton generically receive a Hubble induced mass, which may restore gauge symmetries during inflation and phase transitions may occur during or after inflation as the Hubble parameter decreases. We study topological defect formation associated with such a phase transition in chaotic inflation in supergravity and obtain a severe constraint on the symmetry breaking scale which is related with the tensor-to-scalar ratio. This talk is based on the paper [1].

Kamada, Kohei; Nakayama, Kazunori; Yokoyama, Jun'ichi [Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg (Germany); Department of Physics, Graduate School of Science, University of Tokyo, Tokyo 113-0033 (Japan); Research Center for the Early Universe (RESCEU), Graduate School of Science, University of Tokyo, Tokyo 113-0033 (Japan) and Kavli institute for the Physics and Mathematics of the Universe (IPMU), University of Tokyo, Kashiwa, Chiba, 277-8568 (Japan)

2012-07-27T23:59:59.000Z

299

Aluminum Honeycomb Impact Limiter Study  

Science Conference Proceedings (OSTI)

Scale model testing, static-materials testing, and static and dynamic structural analyses of data on impact limiters provided data for NRC licensing of a spent-fuel transport cask. The analysis of quarter-scale drop test data is reconciled with static and dynamic structural analysis data produced using the ANSYS program.

1991-08-13T23:59:59.000Z

300

Constraint condition on transformed relation for generalized acoustics  

E-Print Network (OSTI)

Contrary to transformation optics (TO), there exist many possibilities for transformed relations of material property and field variable in case of transformation acoustics (TA). To investigate the underlining mechanism and develop a general method that can obtain the full transformed relations, an alternative interpretation to the form-invariance is explored. We consider a spatial transformation, with which a physical phenomenon described in an initial space is transformed to a deformed space, and interpret the mapping by local affine transformation point-by-point. Further, we postulate that the transformed material property and field must rebuild the same physical process, and that the energy must be conserved at each point during the transformation. These conditions impose the constraint on the transformed relation for material property and field. By establishing two local Cartesian frames defined uniquely by the spatial transformation, any physical quantity is shown to first experience a rigid rotation and then a stretch operation during the transformation. We show that the constraint conditions are not enough to determine completely the transformed relation for TA, leaving a possibility to define them differently as found in the literature. New acoustic transformations with constant density or modulus are also proposed and verified by constructing a two-dimensional acoustic cloak. Finally, we show that the transformed relation is uniquely determined for transformation optics, and discuss how this method can be extended to other transformation physics.

Jin Hu; Xiaoning Liu; Gengkai Hu

2009-12-30T23:59:59.000Z

Note: This page contains sample records for the topic "marketplace constraints limit" 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

Analysis of alpha Centauri AB including seismic constraints  

E-Print Network (OSTI)

Detailed models of alpha Cen A and B based on new seismological data for alpha Cen B by Carrier & Bourban (2003) have been computed using the Geneva evolution code including atomic diffusion. Taking into account the numerous observational constraints now available for the alpha Cen system, we find a stellar model which is in good agreement with the astrometric, photometric, spectroscopic and asteroseismic data. The global parameters of the alpha Cen system are now firmly constrained to an age of t=6.52+-0.30 Gyr, an initial helium mass fraction Y_i=0.275+-0.010 and an initial metallicity (Z/X)_i=0.0434+-0.0020. Thanks to these numerous observational constraints, we confirm that the mixing-length parameter alpha of the B component is larger than the one of the A component, as already suggested by many authors (Noels et al. 1991, Fernandes & Neuforge 1995 and Guenther & Demarque 2000): alpha_B is about 8% larger than alpha_A (alpha_A=1.83+-0.10 and alpha_B=1.97+-0.10). Moreover, we show that asteroseismic measurements enable to determine the radii of both stars with a very high precision (errors smaller than 0.3%). The radii deduced from seismological data are compatible with the new interferometric results of Kervella et al. (2003) even if they are slightly larger than the interferometric radii (differences smaller than 1%).

P. Eggenberger; C. Charbonnel; S. Talon; G. Meynet; A. Maeder; F. Carrier; G. Bourban

2004-01-29T23:59:59.000Z

302

Relativistic mean-field models and nuclear matter constraints  

SciTech Connect

This work presents a preliminary study of 147 relativistic mean-field (RMF) hadronic models used in the literature, regarding their behavior in the nuclear matter regime. We analyze here different kinds of such models, namely: (i) linear models, (ii) nonlinear {sigma}{sup 3}+{sigma}{sup 4} models, (iii) {sigma}{sup 3}+{sigma}{sup 4}+{omega}{sup 4} models, (iv) models containing mixing terms in the fields {sigma} and {omega}, (v) density dependent models, and (vi) point-coupling ones. In the finite range models, the attractive (repulsive) interaction is described in the Lagrangian density by the {sigma} ({omega}) field. The isospin dependence of the interaction is modeled by the {rho} meson field. We submit these sets of RMF models to eleven macroscopic (experimental and empirical) constraints, used in a recent study in which 240 Skyrme parametrizations were analyzed. Such constraints cover a wide range of properties related to symmetric nuclear matter (SNM), pure neutron matter (PNM), and both SNM and PNM.

Dutra, M.; Lourenco, O.; Carlson, B. V. [Departamento de Fisica, Instituto Tecnologico de Aeronautica-CTA, 12228-900, Sao Jose dos Campos, SP (Brazil); Delfino, A. [Instituto de Fisica, Universidade Federal Fluminense, 24210-150, Boa Viagem, Niteroi, RJ (Brazil); Menezes, D. P.; Avancini, S. S. [Departamento de Fisica, CFM, Universidade Federal de Santa Catarina, CP. 476, CEP 88.040-900, Florianopolis, SC (Brazil); Stone, J. R. [Oxford Physics, University of Oxford, OX1 3PU Oxford (United Kingdom) and Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37996 (United States); Providencia, C. [Centro de Fisica Computacional, Department of Physics, University of Coimbra, P-3004-516 Coimbra (Portugal); Typel, S. [GSI Helmholtzzentrum fuer Schwerionenforschung GmbH, Theorie, Planckstrasse 1,D-64291 Darmstadt (Germany)

2013-05-06T23:59:59.000Z

303

Qualitative constraint calculi: Heterogeneous verification of composition tables  

E-Print Network (OSTI)

In the domain of qualitative constraint reasoning, a subfield of AI which has evolved in the past 25 years, a large number of calculi for efficient reasoning about spatial and temporal entities has been developed. Reasoning techniques developed for these constraint calculi typically rely on so-called composition tables of the calculus at hand, which allow for replacing semantic reasoning by symbolic operations. Often these composition tables are developed in a quite informal, pictorial manner and hence composition tables are prone to errors. In view of possible safety critical applications of qualitative calculi, however, it is desirable to formally verify these composition tables. In general, the verification of composition tables is a tedious task, in particular in cases where the semantics of the calculus depends on higher-order constructs such as sets. In this paper we address this problem by presenting a heterogeneous proof method that allows for combining a higherorder proof assistance system (such as Isabelle) with an automatic (first order) reasoner (such as SPASS or VAMPIRE). The benefit of this method is that the number of proof obligations that is to be proven interactively with a semi-automatic reasoner can be minimized to an acceptable level.

Stefan Wölfl

2007-01-01T23:59:59.000Z

304

Features of holographic dark energy under the combined cosmological constraints  

E-Print Network (OSTI)

The holographic dark energy model is an important attempt to probe the nature of dark energy which is based on the holographic principle. In this paper, we present the key equations of the holographic dark energy with and without interaction, then using several recent observational data, including 182 selected high-quality type Ia supernovae ($\\rm SN_{sel}$), the baryon acoustic oscillation (BAO) measurement from SDSS, 42 latest X-rays gas mass fraction ($\\rm f_{gas}$) in the clusters and 27 high-redshift gamma-ray burst (GRB) samples, to give reliable and tighter constraints on the holographic dark energy models. The results of our constraints for the $\\rm SN_{sel}+BAO+f_{gas}+GRB$ data set without (with) interaction are c=0.735^{+0.134}_{-0.103}$ and $\\Omega_{\\mathrm{m0}}=0.271^{+0.022}_{-0.019}$, ($c=0.542^{+0.146}_{-0.083}$, $\\Omega_{\\mathrm{m0}}=0.273^{+0.020}_{-0.021}$ and $\\alpha=-0.112^{+0.126}_{-0.008}$, $\\alpha$ is an interacting parameter). We also utilize the Bayesian evidence as a model selection...

Ma, Yin-Zhe

2007-01-01T23:59:59.000Z

305

Phenomenological constraints on broken R parity symmetry in supersymmetry models  

E-Print Network (OSTI)

The R parity odd renormalizable Yukawa interactions of quarks and leptons with the scalar superpartners have the ability to violate the baryon and lepton numbers, change the hadron and lepton flavors and make the lightest supersymmetric particle unstable. The existence of an approximate R parity symmetry would thus affect in a deep way the conventional framework of the Minimal Supersymmetric Standard Model where an exact R parity symmetry is built-in by assumption. The purpose of the present review is to survey in a systematic way the direct experimental constraints set on the R parity violating couplings by the low and intermediate energy physics processes. We consider first the option of bilinear R parity violation and spontaneously broken R parity symmetry and proceed next to the trilinear R parity violating interactions. The discussion aims at surveying the indirect coupling constant bounds derived from fundamental tests of the Standard Model and the variety of scattering and rare decay processes. We also discuss the constraints imposed by the renormalization group scale evolution and the cosmological and astrophysical phenomenology.

Marc Chemtob

2004-06-02T23:59:59.000Z

306

Constructing continuous cartograms: a constraint-based approach  

E-Print Network (OSTI)

We present a constraint-based automatic cartogram construction method that successfully achieves desired region areas while maintaining map topology and preserving essential shape cues to enable region recognition. Results are compared with a number of existing methods, and appear to be superior in both accuracy and preservation of shape recognition cues. A continuous area cartogram is a map transformation in which the map regions are resized relative to the geographic distribution of a data set. By spatially reflecting the data within the map base, the cartogram emphasizes each region's data instead of territorial land area, thereby providing a powerful tool for visualizing data distribution. There are two distinct and conflicting goals in the construction of cartograms: adjusting region sizes and retaining region shapes. Our Constraint-Based Method utilizes three foundational mechanisms to achieve these goals: alternating relaxation, constrained dynamics, and hierarchical resolution. We converge upon each goal in an alternating relaxation fashion, by achieving desired areas without regard to shape, and then utilizing constrained dynamics to attempt to hold the areas fixed while shape is restored. Through hierarchical resolution, we perform gross adjustments initially upon a coarsely resampled map and refinements later at progressively higher levels of detail.

Kocmoud, Christopher James

1997-01-01T23:59:59.000Z

307

Control of multiscale systems with constraints. 1. Basic principles of the concept of evolution of systems with varying constraints  

E-Print Network (OSTI)

Physical fundamentals of the self-organizing theory for the system with varying constraints are considered. A variation principle, specifically the principle of dynamic harmonization as a generalization of the Gauss-Hertz principle for the systems with varying internal structure is formulated. In compliance with this principle the system evolves through dynamics of the processes leading to harmonization of the internal multiscale structure of the system and its connections with external actions as a result of minimizing the dynamic harmonization function. Main principles of the shell model of self-organization under the action of the dominating entropic disturbance are formulated.

S. Adamenko; V. Bolotov; V. Novikov

2013-07-17T23:59:59.000Z

308

Biofuels markets face blending constraints and other challenges ...  

U.S. Energy Information Administration (EIA)

Volume shares are an important metric because of limits on the share of biofuels that can be used in ... when the Environmental ... compliance with the ...

309

Fundamental limits on energy transfer and circuit considerations for piezoelectric transformers  

E-Print Network (OSTI)

Abstract—This work investigates fundamental limits on electromechanical energy conversion capacity of piezoelectric transformers by considering a work cycle analysis. Fundamental limitations in a lossless piezoelectric transformer are imposed by maximum electric field strength, maximum surface charge density, maximum stress, and maximum strain. For the lossless case, our analysis indicates that the mechanical stress limit is the effective constraint in typical PZT materials. For a specific PZT-5H sample considered, a mechanical stress-limited work cycle indicates that this material can handle 330 W/cm3 at 100 kHz. A second direction this work has taken has been an investigation into a soft-switching drive and control circuit, that does not require any magnetic components. The theory of operation of softswitching resonant drive circuitry is discussed, and experimental results on a soft-switching inverter incorporating no magnetic components are reported. Index Terms—Piezoelectric, soft-switching, transformer, work cycle.

Anita M. Flynn; Seth R. S

2002-01-01T23:59:59.000Z

310

Optimal estimation with limited measurements  

Science Conference Proceedings (OSTI)

This paper introduces a sequential estimation problem with two decision makers, or agents, who work as members of a team. One of the agents sits at an observation post, and makes sequential observations about the state of an underlying stochastic process ... Keywords: WSNs, limited information, networked control systems, optimal estimation, real-time control, real-time monitoring, recursive estimation, sequential estimation, wireless networks, wireless sensor networks

Orhan C. Imer; Tamer Basar

2010-01-01T23:59:59.000Z

311

A constraint-satisfaction approach for 3D vision/touch-based object recognition  

Science Conference Proceedings (OSTI)

We present a technique for recognizing polyhedral objects by integrating visual and tactile data. The problem is formulated as a constraint-satisfaction problem (CSP) to provide a unified framework for integrating different types of sensory data. To ... Keywords: 3D vision/touch-based object recognition, computational complexity, constraint handling, constraint-satisfaction approach, correspondence uncertainty, data integration, erroneous model object elimination, image recognition, local-consistency enforcing, object recognition, polyhedral objects, scene perceptual structures, tactile data, visual data

1995-08-01T23:59:59.000Z

312

General Relativity in two dimensions: a Hamilton-Jacobi constraint analysis  

E-Print Network (OSTI)

We will analyze the constraint structure of the Einstein-Hilbert first-order action in two dimensions using the Hamilton-Jacobi approach. We will be able to find a set of involutive, as well as a set of non-involutive constraints. Using generalized brackets we will show how to assure integrability of the theory, to eliminate the set of non-involutive constraints, and to build the field equations.

M. C. Bertin; B. M. Pimentel; P. J. Pompeia

2009-11-11T23:59:59.000Z

313

The use of natural gas for reduction of metal oxides: constraints and ...  

Science Conference Proceedings (OSTI)

Presentation Title, The use of natural gas for reduction of metal oxides: constraints ... Reaction mechanism and reaction rate of Sn evaporation from liquid steel.

314

Primordial Helium Abundance from CMB: a constraint from recent observations and a forecast  

E-Print Network (OSTI)

We study a constraint on the primordial helium abundance $Y_p$ from current and future observations of CMB. Using the currently available data from WMAP, ACBAR, CBI and BOOMERANG, we obtained the constraint as $Y_p = 0.25 \\pm 0.10$ at 1$\\sigma$ level. We also provide a forecast for Planck using the Markov Chain Monte Carlo approach. In addition to forecasting the constraint on $Y_p$, we investigate how assumptions for $Y_p$ affect the constraints on the other cosmological parameters.

Ichikawa, Kazuhide; Takahashi, Tomo

2007-01-01T23:59:59.000Z

315

Primordial Helium Abundance from CMB: a constraint from recent observations and a forecast  

E-Print Network (OSTI)

We studied a constraint on the primordial helium abundance Y_p from current and future observations of CMB. Using the currently available data from WMAP, ACBAR, CBI and BOOMERANG, we obtained the constraint as Y_p = 0.25^{+0.10}_{-0.07} at 68% C.L. We also provide a forecast for the Planck experiment using the Markov chain Monte Carlo approach. In addition to forecasting the constraint on Y_p, we investigate how assumptions for Y_p affect constraints on the other cosmological parameters.

Kazuhide Ichikawa; Toyokazu Sekiguchi; Tomo Takahashi

2007-12-28T23:59:59.000Z

316

Definition: System Operating Limit | Open Energy Information  

Open Energy Info (EERE)

Operating Limit Operating Limit Jump to: navigation, search Dictionary.png System Operating Limit The value (such as MW, MVar, Amperes, Frequency or Volts) that satisfies the most limiting of the prescribed operating criteria for a specified system configuration to ensure operation within acceptable reliability criteria. System Operating Limits are based upon certain operating criteria. These include, but are not limited to: Facility Ratings (Applicable pre- and post- Contingency equipment or facility ratings), Transient Stability Ratings (Applicable pre- and post-Contingency Stability Limits), Voltage Stability Ratings (Applicable pre- and post- Contingency Voltage Stability), System Voltage Limits (Applicable pre- and post- Contingency Voltage Limits)[1] Also Known As SOL

317

Further constraints on electron acceleration in solar noise storms  

E-Print Network (OSTI)

We reexamine the energetics of nonthermal electron acceleration in solar noise storms. A new result is obtained for the minimum nonthermal electron number density required to produce a Langmuir wave population of sufficient intensity to power the noise storm emission. We combine this constraint with the stochastic electron acceleration formalism developed by Subramanian & Becker (2005) to derive a rigorous estimate for the efficiency of the overall noise storm emission process, beginning with nonthermal electron acceleration and culminating in the observed radiation. We also calculate separate efficiencies for the electron acceleration -- Langmuir wave generation stage and the Langmuir wave -- noise storm production stage. In addition, we obtain a new theoretical estimate for the energy density of the Langmuir waves in noise storm continuum sources.

Prasad Subramanian; Peter A. Becker

2006-02-28T23:59:59.000Z

318

Solar System Constraints on f(G) Dark Energy  

E-Print Network (OSTI)

Corrections to solar system gravity are derived for f(G) gravity theories, in which a function of the Gauss-Bonnet curvature term is added to the gravitational action. Their effects on Newton's law, as felt by the planets, and on the frequency shift of signals from the Cassini spacecraft, are both determined. Despite the fact that the Gauss-Bonnet term is quadratic in curvature, the resulting constraints are substantial. It is shown that they practically rule out f(G) as a natural explanation for the late-time acceleration of the universe. Possible exceptions are when f(G) reduces to something very close to a cosmological constant, or if the form of the function f is exceptionally fine-tuned.

Stephen C. Davis

2007-09-27T23:59:59.000Z

319

Higher-order discrete variational problems with constraints  

E-Print Network (OSTI)

An interesting family of geometric integrators for Lagrangian systems can be defined using discretizations of the Hamilton's principle of critical action. This family of geometric integrators is called variational integrators. In this paper, we derive new variational integrators for higher-order lagrangian mechanical system subjected to higher-order constraints. From the discretization of the variational principles, we show that our methods are automatically symplectic and, in consequence, with a very good energy behavior. Additionally, the symmetries of the discrete Lagrangian imply that momenta is conserved by the integrator. Moreover, we extend our construction to variational integrators where the lagrangian is explicitly time-dependent. Finally, some motivating applications of higher-order problems are considered; in particular, optimal control problems for explicitly time-dependent underactuated systems and an interpolation problem on Riemannian manifolds.

Leonardo Colombo; David Martín de Diego; Marcela Zuccalli

2013-06-03T23:59:59.000Z

320

Crisis in Cosmology : Observational Constraints on Omega and H_0  

E-Print Network (OSTI)

Thanks to new technology of observations and fresh inputs from particle physics, cosmology has advanced on both observational and theoretical fronts. It is therefore opportune that we take stock of the cosmological situation today and examine the observational and theoretical constraints as they are now. The bottom line in this review is that despite the availability of the cosmological constant as an extra parameter for flat Friedmann models, the allowed parameter space for such models is very small. The observations that we consider here include the ages of globular clusters, measurement of Hubble's constant, abundance of rich clusters of galaxies, fraction of mass contributed by baryons in rich clusters and abundance of high redshift objects.

J. S. Bagla; T. Padmanabhan; J. V. Narlikar

1995-11-22T23:59:59.000Z

Note: This page contains sample records for the topic "marketplace constraints limit" 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

Complexity of Homogeneous Co-Boolean Constraint Satisfaction Problems  

E-Print Network (OSTI)

Constraint Satisfaction Problems (CSP) constitute a convenient way to capture many combinatorial problems. The general CSP is known to be NP-complete, but its complexity depends on a template, usually a set of relations, upon which they are constructed. Following this template, there exist tractable and intractable instances of CSPs. It has been proved that for each CSP problem over a given set of relations there exists a corresponding CSP problem over graphs of unary functions belonging to the same complexity class. In this short note we show a dichotomy theorem for every finite domain D of CSP built upon graphs of homogeneous co-Boolean functions, i.e., unary functions sharing the Boolean range {0, 1}.

Richoux, Florian

2010-01-01T23:59:59.000Z

322

Phenomenological constraints on minimally coupled exotic lepton triplets  

Science Conference Proceedings (OSTI)

By introducing a set of new triplet leptons (with nonzero hypercharge) that can Yukawa couple to their standard model counterparts, new sources of tree-level flavor changing currents are induced via mixing. In this work, we study some of the consequences of such new contributions on processes such as the leptonic decays of gauge bosons, l{yields}3l{sup '} and l{yields}l{sup '{gamma}}, which violate lepton flavor, and {mu}-e conversion in atomic nuclei. Constraints are then placed on the parameters associated with the exotic triplets by invoking the current low-energy experimental data. Moreover, the new physics contribution to the lepton anomalous magnetic moments is calculated.

Chua, Chun-Khiang; Law, Sandy S. C. [Department of Physics, Chung Yuan Christian University, Chung-Li, Taiwan 320 (China)

2011-03-01T23:59:59.000Z

323

UNDERSTANDING THE EFFECTS OF COMPRESSION AND CONSTRAINTS ON WATER UPTAKE OF FUEL-CELL MEMBRANES  

Science Conference Proceedings (OSTI)

Accurate characterization of polymer-electrolyte fuel cells (PEFCs) requires understanding the impact of mechanical and electrochemical loads on cell components. An essential aspect of this relationship is the effect of compression on the polymer membrane?s water-uptake behavior and transport properties. However, there is limited information on the impact of physical constraints on membrane properties. In this paper, we investigate both theoretically and experimentally how the water uptake of Nafion membrane changes under external compression loads. The swelling of a compressed membrane is modeled by modifying the swelling pressure in the polymer backbone which relies on the changes in the microscopic volume of the polymer. The model successfully predicts the water content of the compressed membrane measured through in-situ swelling-compression tests and neutron imaging. The results show that external mechanical loads could reduce the water content and conductivity of the membrane, especially at lower temperatures, higher humidities, and in liquid water. The modeling framework and experimental data provide valuable insight for the swelling and conductivity of constrained and compressed membranes, which are of interest in electrochemical devices such as batteries and fuel cells.

Kusoglu, Ahmet; Kienitz, Briian; Weber, Adam

2011-08-24T23:59:59.000Z

324

Bayesian Constraints on theta_{13} from Solar and KamLAND Neutrino Data  

E-Print Network (OSTI)

We present the results of a Bayesian analysis of solar and KamLAND neutrino data in the framework of three-neutrino mixing. We adopt two approaches for the prior probability distribution of the oscillation parameters Delta m^2_{21}, sin^2 theta_{12}, sin^2 theta_{13}: 1) a traditional flat uninformative prior; 2) an informative prior which describes the limits on sin^2 theta_{13} obtained in atmospheric and long-baseline accelerator and reactor neutrino experiments. In both approaches, we present the allowed regions in the sin^2 theta_{13} - Delta m^2_{21} and sin^2 theta_{12} - sin^2 theta_{13} planes, as well as the marginal posterior probability distribution of sin^2 theta_{13}. We confirm the 1.2 sigma hint of theta_{13} > 0 found in hep-ph/0806.2649 from the analysis of solar and KamLAND neutrino data. We found that the statistical significance of the hint is reduced to about 0.8 sigma by the constraints on sin^2 theta_{13} coming from atmospheric and long-baseline accelerator and reactor neutrino data, in agreement with arXiv:0808.2016.

H. L. Ge; C. Giunti; Q. Y. Liu

2008-10-30T23:59:59.000Z

325

Submitted to the Astronomical Journal First Constraints on Rings in the Pluto System  

E-Print Network (OSTI)

Simple theoretical calculations have suggested that small body impacts onto Pluto’s newly discovered small satellites, Nix and Hydra, are capable of generating time-variable rings or dust sheets in the Pluto system. We present the first observational constraints on the present-day optical depth of such debris systems using HST/ACS data obtained on 2006 February 15 and 2006 March 2. We find that any Plutonian dust rings between Nix and Hydra must have optical depths of 2x10 ?5 or lower, when averaged over 1000-km radial distance scales. While usefully constraining, the derived ring optical depth limits are still a factor of four higher than those predicted by Stern et al. (2006a). Were the New Horizons spacecraft to fly through a ring system with optical depth as high as 2x10 ?5, it would collide with a significant number of potentially damaging ring particles. We therefore recommend that New Horizons cross the potential ring plane at a radial distance where dust rings are not expected due to either dynamical instability or large distance from potential sources of ring particles.

A. J. Steffl; S. A. Stern

2006-01-01T23:59:59.000Z

326

Green Heat Solutions Limited | Open Energy Information  

Open Energy Info (EERE)

Heat Solutions Limited Jump to: navigation, search Name Green Heat Solutions Limited Sector Marine and Hydrokinetic Website http:http:www.greenheating Region Scotland LinkedIn...

327

Local Generation Limited | Open Energy Information  

Open Energy Info (EERE)

Limited Place United Kingdom Sector Biomass Product UK-based biomass firm developing anaerobic digestion plants. References Local Generation Limited1 LinkedIn Connections...

328

China Innovation Investment Limited | Open Energy Information  

Open Energy Info (EERE)

Innovation Investment Limited Jump to: navigation, search Name China Innovation Investment Limited Place Hong Kong Sector Solar Product Hong Kong-listed alternative energy...

329

Undergraduate Program Time Limits and Work Schedules  

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

Time Limits and Work Schedules Undergraduate Program Time Limits and Work Schedules Point your career towards LANL: work with the best minds on the planet in an inclusive...

330

Greenergy Biofuels Limited | Open Energy Information  

Open Energy Info (EERE)

Greenergy Biofuels Limited Jump to: navigation, search Name Greenergy Biofuels Limited Place London, Greater London, United Kingdom Zip WC1V 7BD Sector Biofuels Product Imports,...

331

United Biofuels Private Limited | Open Energy Information  

Open Energy Info (EERE)

Page Edit with form History Facebook icon Twitter icon United Biofuels Private Limited Jump to: navigation, search Name United Biofuels Private Limited Place Tamil Nadu, India...

332

Are there capacity limitations in symmetry perception?  

E-Print Network (OSTI)

1980). The demonstration of capacity limitation. Cognitive1972). Visual processing capacity and attentional control.J. (1996). Goodness of CAPACITY LIMIT OF SYMMETRY PERCEPTION

Huang, L Q; Pashler, Harold; Junge, J A

2004-01-01T23:59:59.000Z

333

Exorka International Limited | Open Energy Information  

Open Energy Info (EERE)

Exorka International Limited is a specialist developer of low-temperature geothermal electricity generation, incorporated in England. References Exorka International Limited1...

334

Colony Mills Limited | Open Energy Information  

Open Energy Info (EERE)

Mills Limited Jump to: navigation, search Name Colony Mills Limited Place Lahore, Pakistan Sector Solar Product Yarn manufacturer, plans to set up solar thermal plant....

335

Voith Hydro Wavegen Limited | Open Energy Information  

Open Energy Info (EERE)

Voith Hydro Wavegen Limited Jump to: navigation, search Name Voith Hydro Wavegen Limited Sector Marine and Hydrokinetic Website http:www.wavegen.co.uk Region United Kingdom...

336

Observational Constraints on Microwave Anisotropy from Point Sources  

E-Print Network (OSTI)

Applying basic physical principles to recent observational results, we derive upper and lower limits on microwave anisotropy from point sources over the range of frequencies 10-1000 GHz. We examine the level of noise in the observations as a possible indication of source confusion at subarcminute scales. We also derive an upper limit on microwave anisotropy caused by the sources responsible for the Far-Infrared Background radiation detected in FIRAS data. Our upper limit on point source confusion of DeltaT/T=10^{-5} for a 10' beam at 100 GHz would cause severe foreground contamination for CMB anisotropy observations, although the actual contamination level is probably much lower. This upper limit constrains the long-feared possibility of an undetected population of sources with emission peaking near 100 GHz. Source detections closer to 100 GHz are needed to improve our knowledge of galaxy evolution at high redshift and to predict the level of point source confusion.

Eric Gawiser; Andrew Jaffe; Joseph Silk

1998-11-10T23:59:59.000Z

337

Limited-life cartridge primers  

DOE Patents (OSTI)

A cartridge primer is described which utilizes an explosive that can be designed to become inactive in a predetermined period of time: a limited-life primer. The explosive or combustible material of the primer is an inorganic reactive multilayer (RML). The reaction products of the RML are sub-micron grains of non-corrosive inorganic compounds that would have no harmful effects on firearms or cartridge cases. Unlike use of primers containing lead components, primers utilizing RML`s would not present a hazard to the environment. The sensitivity of an RML is determined by the physical structure and the stored interfacial energy. The sensitivity lowers with time due to a decrease in interfacial energy resulting from interdiffusion of the elemental layers. Time-dependent interdiffusion is predictable, thereby enabling the functional lifetime of an RML primer to be predetermined by the initial thickness and materials selection of the reacting layers. 10 figs.

Makowiecki, D.M.; Rosen, R.S.

1998-06-30T23:59:59.000Z

338

Limited-life cartridge primers  

DOE Patents (OSTI)

A cartridge primer which utilizes an explosive that can be designed to become inactive in a predetermined period of time: a limited-life primer. The explosive or combustible material of the primer is an inorganic reactive multilayer (RML). The reaction products of the RML are sub-micron grains of non-corrosive inorganic compounds that would have no harmful effects on firearms or cartridge cases. Unlike use of primers containing lead components, primers utilizing RML's would not present a hazard to the environment. The sensitivity of an RML is determined by the physical structure and the stored interfacial energy. The sensitivity lowers with time due to a decrease in interfacial energy resulting from interdiffusion of the elemental layers. Time-dependent interdiffusion is predictable, thereby enabling the functional lifetime of an RML primer to be predetermined by the initial thickness and materials selection of the reacting layers.

Makowiecki, Daniel M. (Livermore, CA); Rosen, Robert S. (San Ramon, CA)

1998-01-01T23:59:59.000Z

339

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

Science Conference Proceedings (OSTI)

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

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

2011-09-01T23:59:59.000Z

340

Analysis of Energy Efficiency in Fading Channels under QoS Constraints  

E-Print Network (OSTI)

Analysis of Energy Efficiency in Fading Channels under QoS Constraints Deli Qiao, Mustafa Cenk, and energy requirements under QoS constraints are identified. The analysis is conducted for the case in which vanishes. Through the wideband slope analysis, the increased energy requirements at low but nonzero power

Gursoy, Mustafa Cenk

Note: This page contains sample records for the topic "marketplace constraints limit" 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

Stochastic search versus genetic algorithms for solving real time and over-constrained temporal constraint problems  

Science Conference Proceedings (OSTI)

The aim of this work is to study the applicability of Genetic Algorithms (GAs) and stochastic local search methods to solve real time and over constrained temporal constraint problems. Solving these two type of problems consists of finding a possible ... Keywords: constraint satisfaction, genetic algorithms, local search, temporal reasoning

Malek Mouhoub

2005-01-01T23:59:59.000Z

342

Experimental Analysis of Numeric and Symbolic ConstraintSatisfaction Techniques for Temporal Reasoning  

Science Conference Proceedings (OSTI)

Many temporal applications like planning and scheduling can be viewed as special cases of the numeric and symbolic temporal constraint satisfaction problem. Thus we have developed a temporal model, TemPro, based on the interval Algebra, to express ... Keywords: arc consistency, constraint satisfaction, path consistency, temporal reasoning

Malek Mouhoub; Francois Charpillet; Jean Paul Haton

1998-06-01T23:59:59.000Z

343

Institutional constraints on alternative water for energy: a guidebook for regional assessments  

Science Conference Proceedings (OSTI)

Basic information is presented about the legal, political, and social constraints faced by energy developers in the acquisition of water from underground, irrigation return flow, municipal waste, and saline sources. It is a guide to those institutional constraints which are general and pronounced enough to be important for regional assessments. First, attention was focused on the acquisition phase of the water use cycle. Second, constraints were analyzed primarily from a regional, rather than state-by-state, perspective. Emphasis was placed generally on the West - particularly the synfuel-rich Rocky Mountain states, the East, and Mid-West, in that order. Alaska and Hawaii were not surveyed. Third, the study focuses on the constraints associated with groundwater, municipal waste, irrigation return flow, and sea water, in that order. The phrase, institutional constraints, as used in the study, means legal, social, economic, and political restrictions, requirements, circumstances, or conditions that must be anticipated or responded to in order to acquire water for energy development. The study focuses primarily on legal constraints and secondarily on political constraints, because they tend to encompass or reflect other forms of institutional constraints.

Not Available

1980-11-01T23:59:59.000Z

344

Solving production scheduling with earliness/tardiness penalties by constraint programming  

Science Conference Proceedings (OSTI)

This paper deals with an application of constraint programming in production scheduling with earliness and tardiness penalties that reflects the scheduling part of the Just-In-Time inventory strategy. Two scheduling problems are studied, an industrial ... Keywords: Constraint programming, Earliness/tardiness cost, Production scheduling

Jan Kelbel; Zden?k Hanzálek

2011-08-01T23:59:59.000Z

345

The ciff proof procedure for abductive logic programming with constraints: Theory, implementation and experiments  

Science Conference Proceedings (OSTI)

We present the CIFF proof procedure for abductive logic programming with constraints, and we prove its correctness. CIFF is an extension of the IFF proof procedure for abductive logic programming, relaxing the original restrictions over variable quantification ... Keywords: abduction, constraints, proof procedures

Paolo Mancarella; Giacomo Terreni; Fariba Sadri; Francesca Toni; Ulle Endriss

2010-03-01T23:59:59.000Z

346

The ciff proof procedure for abductive logic programming with constraints: Theory, implementation and experiments  

Science Conference Proceedings (OSTI)

We present the CIFF proof procedure for abductive logic programming with constraints, and we prove its correctness. CIFF is an extension of the IFF proof procedure for abductive logic programming, relaxing the original restrictions over variable quantification ... Keywords: abduction, constraints, proof procedures

Paolo Mancarella; Giacomo Terreni; Fariba Sadri; Francesca Toni; Ulle Endriss

2009-11-01T23:59:59.000Z

347

Hard, Flexible and Dynamic Constraint Satisfaction Ian Miguel and Qiang Shen  

E-Print Network (OSTI)

Hard, Flexible and Dynamic Constraint Satisfaction Ian Miguel and Qiang Shen School of Arti#12;cial satisfaction problem (CSP) with hard, imperative constraints is insuĂ?cient to model many real problems. Two satisfaction have been applied to real-world problems, it has become increasingly clear that classical hard

Miguel, Ian

348

An evolutionary algorithm based on Nash Dominance for Equilibrium Problems with Equilibrium Constraints  

Science Conference Proceedings (OSTI)

This paper introduces an evolutionary algorithm for the solution of a class of hierarchical (''leader-follower'') games known as Equilibrium Problems with Equilibrium Constraints (EPECs). In one manifestation of such games, players at the upper level ... Keywords: Electricity markets, Equilibrium Problems with Equilibrium Constraints, Nash Equilibrium, Transportation systems management

Andrew Koh

2012-01-01T23:59:59.000Z

349

Cosmological constraints in the presence of ionizing and resonance radiation at recombination  

E-Print Network (OSTI)

With the recent measurement of full sky cosmic microwave background polarization from WMAP, key cosmological degeneracies have been broken, allowing tighter constraints to be placed on cosmological parameters inferred assuming a standard recombination scenario. Here we consider the effect on cosmological constraints if additional ionizing and resonance radiation sources are present at recombination. We find that the new CMB data significantly improve the constraints on the additional radiation sources, with $\\log_{10}[\\epsilon_{\\alpha}] < -0.5$ and $\\log_{10}[\\epsilon_{i}] <-2.4$ at 95% c.l. for resonance and ionizing sources respectively. Including the generalized recombination scenario, however, we find that the constraints on the scalar spectral index $n_s$ are weakened to $n_s=0.98\\pm0.03$, with the $n_s=1$ case now well inside the 95% c.l.. The relaxation of constraints on tensor modes, scale invariance, dark energy and neutrino masses are also discussed.

Rachel Bean; Alessandro Melchiorri; Joe Silk

2007-01-09T23:59:59.000Z

350

An improved algorithm for maintaining arc consistency in dynamic constraint satisfaction problems  

E-Print Network (OSTI)

Real world is dynamic in its nature, so techniques attempting to model the real world should take this dynamicity in consideration. A well known Constraint Satisfaction Problem (CSP) can be extended this way to a so called Dynamic Constraint Satisfaction Problem (DynCSP) that supports adding and removing constraints in runtime. As Arc Consistency is one of the major techniques in solving CSPs, its dynamic version is of a particular interest for DynCSPs. This paper presents an improved version of AC|DC-2 algorithm for maintaining maximal arc consistency after constraint retraction. This improvement leads to runtimes better than the so far fastest dynamic arc consistency algorithm DnAC-6 while keeping low memory consumption. Moreover, the proposed algorithm is open in the sense of using either non-optimal AC-3 algorithm keeping a minimal memory consumption or optimal AC-3.1 algorithm improving runtime for constraint addition but increasing a memory consumption.

Roman Barták; Pavel Surynek

2005-01-01T23:59:59.000Z

351

Joint anisotropy and source count constraints on the contribution of blazars to the diffuse gamma-ray background  

E-Print Network (OSTI)

We place new constraints on the contribution of blazars to the large-scale isotropic gamma-ray background (IGRB) by jointly analyzing the measured source count distribution (logN-logS) of blazars and the measured intensity and anisotropy of the IGRB. We find that these measurements point to a consistent scenario in which unresolved blazars make less than 20% of the IGRB intensity at 1-10 GeV while accounting for the majority of the measured anisotropy in that energy band. These results indicate that the remaining fraction of the IGRB intensity is made by a component with a low level of intrinsic anisotropy. We determine upper limits on the anisotropy from non-blazar sources, adopting the best-fit parameters of the measured source count distribution to calculate the unresolved blazar anisotropy. In addition, we show that the anisotropy measurement excludes some recently proposed models of the unresolved blazar population.

Alessandro Cuoco; Eiichiro Komatsu; Jennifer Siegal-Gaskins

2012-02-23T23:59:59.000Z

352

Atmospheric constraints for the CO2 partial pressure on terrestrial planets near the outer edge of the habitable zone  

E-Print Network (OSTI)

In recent years, several potentially habitable, probably terrestrial exoplanets and exoplanet candidates have been discovered. The amount of CO2 in their atmosphere is of great importance for surface conditions and habitability. In the absence of detailed information on the geochemistry of the planet, this amount could be considered as a free parameter. Up to now, CO2 partial pressures for terrestrial planets have been obtained assuming an available volatile reservoir and outgassing scenarios. This study aims at calculating the allowed maximum CO2 pressure at the surface of terrestrial exoplanets orbiting near the outer boundary of the habitable zone by coupling the radiative effects of the CO2 and its condensation at the surface. These constraints might limit the permitted amount of atmospheric CO2, independent of the planetary reservoir. A 1D radiative-convective cloud-free atmospheric model was used. CO2 partial pressures are fixed according to surface temperature and vapor pressure curve. Considered scena...

von Paris, Philip; Hedelt, Pascal; Rauer, Heike; Selsis, Franck; Stracke, Barbara

2012-01-01T23:59:59.000Z

353

Dynamics and constraints of the unified dark matter flat cosmologies  

SciTech Connect

We study the dynamics of the scalar field Friedmann-Lemaitre-Robertson-Walker flat cosmological models within the framework of the unified dark matter (UDM) scenario. In this model we find that the main cosmological functions such as the scale factor of the Universe, the scalar field, the Hubble flow, and the equation of state parameter are defined in terms of hyperbolic functions. These analytical solutions can accommodate an accelerated expansion, equivalent to either the dark energy or the standard {lambda} models. Performing a joint likelihood analysis of the recent supernovae type Ia data and the baryonic acoustic oscillations traced by the Sloan Digital Sky Survey galaxies, we place tight constraints on the main cosmological parameters of the UDM cosmological scenario. Finally, we compare the UDM scenario with various dark energy models namely {lambda} cosmology, parametric dark energy model and variable Chaplygin gas. We find that the UDM scalar field model provides a large and small scale dynamics which are in fair agreement with the predictions by the above dark energy models although there are some differences especially at high redshifts.

Basilakos, Spyros [Academy of Athens, Research Center for Astronomy and Applied Mathematics, Soranou Efesiou 4, GR-11527, Athens (Greece); Lukes-Gerakopoulos, Georgios [Academy of Athens, Research Center for Astronomy and Applied Mathematics, Soranou Efesiou 4, GR-11527, Athens (Greece); University of Athens, Department of Physics, Section of Astrophysics, Astronomy and Mechanics (Greece)

2008-10-15T23:59:59.000Z

354

Stellar Evolution Constraints on the Triple-Alpha Reaction Rate  

E-Print Network (OSTI)

We investigate the quantitative constraint on the triple-alpha reaction rate based on stellar evolution theory, motivated by the recent significant revision of the rate proposed by nuclear physics calculations. Targeted stellar models were computed in order to investigate the impact of that rate in the mass range of 0.8 rate has a significant impact on the evolution of low- and intermediate-mass stars, while its influence on the evolution of massive stars (M >~ 10 Msun) is minimal. We find that employing the revised rate suppresses helium shell flashes on AGB phase for stars in the initial mass range 0.8 10 at T = 1 - 1.2 x 10^8 K where the cross section is proportional to T^{nu}. We also derive the helium ignition curve to estimate the maximum cross section to retain the low-mass first red giants. The semi-analytically derived ignition curves suggest that the reaction rate should be less than ~ 10^{-29} cm^6 s^{-1} mole^{-2} at ~ 10^{7.8} K, which corresponds to about three orders of magnitude larger than that of the NACRE compilation. In an effort to compromise with the revised rates, we calculate and analyze models with enhanced CNO cycle reaction rates to increase the maximum luminosity of the first giant branch. However, it is impossible to reach the typical RGB tip luminosity even if all the reaction rates related to CNO cycles are enhanced by more than ten orders of magnitude.

Takuma Suda; Raphael Hirschi; Masayuki Y. Fujimoto

2011-07-25T23:59:59.000Z

355

Analysis of Fuel Ethanol Transportation Activity and Potential Distribution Constraints  

SciTech Connect

This paper provides an analysis of fuel ethanol transportation activity and potential distribution constraints if the total 36 billion gallons of renewable fuel use by 2022 is mandated by EPA under the Energy Independence and Security Act (EISA) of 2007. Ethanol transport by domestic truck, marine, and rail distribution systems from ethanol refineries to blending terminals is estimated using Oak Ridge National Laboratory s (ORNL s) North American Infrastructure Network Model. Most supply and demand data provided by EPA were geo-coded and using available commercial sources the transportation infrastructure network was updated. The percentage increases in ton-mile movements by rail, waterways, and highways in 2022 are estimated to be 2.8%, 0.6%, and 0.13%, respectively, compared to the corresponding 2005 total domestic flows by various modes. Overall, a significantly higher level of future ethanol demand would have minimal impacts on transportation infrastructure. However, there will be spatial impacts and a significant level of investment required because of a considerable increase in rail traffic from refineries to ethanol distribution terminals.

Das, Sujit [ORNL; Peterson, Bruce E [ORNL; Chin, Shih-Miao [ORNL

2010-01-01T23:59:59.000Z

356

Analysis of 70 Ophiuchi AB including seismic constraints  

E-Print Network (OSTI)

The analysis of solar-like oscillations for stars belonging to a binary system provides a unique opportunity to probe the internal stellar structure and to test our knowledge of stellar physics. Such oscillations have been recently observed and characterized for the A component of the 70 Ophiuchi system. A model of 70 Ophiuchi AB that correctly reproduces all observational constraints available for both stars is determined. An age of 6.2 +- 1.0 Gyr is found with an initial helium mass fraction Y_i=0.266 +- 0.015 and an initial metallicity (Z/X)_i=0.0300 +- 0.0025 when atomic diffusion is included and a solar value of the mixing-length parameter assumed. A precise and independent determination of the value of the mixing-length parameter needed to model 70 Oph A requires accurate measurement of the mean small separation, which is not available yet. Current asteroseismic observations, however, suggest that the value of the mixing-length parameter of 70 Oph A is lower or equal to the solar calibrated value. The e...

Eggenberger, P; Carrier, F; Fernandes, J; Santos, N C

2008-01-01T23:59:59.000Z

357

Analysis of 70 Ophiuchi AB including seismic constraints  

E-Print Network (OSTI)

The analysis of solar-like oscillations for stars belonging to a binary system provides a unique opportunity to probe the internal stellar structure and to test our knowledge of stellar physics. Such oscillations have been recently observed and characterized for the A component of the 70 Ophiuchi system. A model of 70 Ophiuchi AB that correctly reproduces all observational constraints available for both stars is determined. An age of 6.2 +- 1.0 Gyr is found with an initial helium mass fraction Y_i=0.266 +- 0.015 and an initial metallicity (Z/X)_i=0.0300 +- 0.0025 when atomic diffusion is included and a solar value of the mixing-length parameter assumed. A precise and independent determination of the value of the mixing-length parameter needed to model 70 Oph A requires accurate measurement of the mean small separation, which is not available yet. Current asteroseismic observations, however, suggest that the value of the mixing-length parameter of 70 Oph A is lower or equal to the solar calibrated value. The effects of atomic diffusion and of the choice of the adopted solar mixture were also studied. We also tested and compared the theoretical tools used for the modeling of stars for which p-modes frequencies are detected by performing this analysis with three different stellar evolution codes and two different calibration methods. We found that the different evolution codes and calibration methods we used led to perfectly coherent results.

P. Eggenberger; A. Miglio; F. Carrier; J. Fernandes; N. C. Santos

2008-02-25T23:59:59.000Z

358

Constraint on slepton intergenerational mixing from big-bang nucleosynthesis  

Science Conference Proceedings (OSTI)

We find constraint on intergenerational mixing of slepton from big-bang nucleosynthesis (BBN). Today, we know that there exist lepton flavor violation (LFV) from the observation of neutrino oscillation, though there do not exist LFV in the standard model of particle physics (SM). LFV in charged lepton sector (cLFV) have also been expected to exist. From theoretical point of view, the effects of long-lived stau on BBN have been investigated and it is known that the stau can solve the cosmological 7Li problem. However, in the study so far, tau flavor is exactly conserved and it contradict with the existence of cLFV. In this study, we generalize the flavor to be violated and call the stau as slepton. Even if the violation is tiny, it drastically changes the lifetime and the evolution of relic density of the slepton. Thus we analyze the effects of the long-lived slepton on BBN, and constrain the magnitude of the cLFV.

Kohri, Kazunori; Ohta, Shingo; Sato, Joe; Shimomura, Takashi; Yamanaka, Masato [Theory Center, Institute of Particle and Nuclear Studies, KEK (High Energy Accelerator Research Organization), 1-1 Oho, Tsukuba 305-0801 (Japan); Department of Physics, Saitama University, Shimo-okubo, Sakura-ku, Saitama, 338-8570 (Japan); Department of Physics, Niigata University, Niigata, 950-8502 (Japan) and Max-Planck-Institut fur Kernphysik, Saupfercheckweg 1, 69117 Heidelberg (Germany); Maskawa Institute for Science and Culture, Kyoto Sangyo University, Kyoto 603-8555 (Japan)

2012-07-27T23:59:59.000Z

359

Constraints on proton structure from precision atomic physics measurements  

DOE Green Energy (OSTI)

The ground-state hyperfine splittings in hydrogen and muonium are extremely well measured. The difference between them, after correcting for the different magnetic moments of the muon and proton and for reduced mass effects, is due solely to the structure of the proton - the large QED contributions for a pointlike nucleus essentially cancel. A major contribution to the rescaled hyperfine difference is proportional to the Zemach radius, a fundamental measure of the proton which can be computed as an integral over the product of the elastic electric and magnetic form factors of the proton. The remaining proton structure corrections, the polarization contribution from inelastic states in the spin-dependent virtual Compton amplitude and the proton size dependence of the relativistic recoil corrections, have small uncertainties. The resulting high precision determination of the Zemach radius (1.013 {+-} 0.016) fm from atomic physics provides an important constraint on fits to accelerator measurements of the proton electric and magnetic form factors. Conversely, the authors use the muonium data to extract an 'experimental' value for the QED corrections to the hyperfine splitting of hydrogenic atoms. There is a significant discrepancy between measurement and theory which is in the same direction as a corresponding discrepancy in positronium.

Brodsky, S

2004-08-10T23:59:59.000Z

360

Symmetry Energy Constraints from Giant Resonances: A Theoretical Overview  

E-Print Network (OSTI)

Giant resonances encapsulate the dynamic response of the nuclear ground state to external perturbations. As such, they offer a unique view of the nucleus that is often not accessible otherwise. Although interesting in their own right, giant resonances are also enormously valuable in providing stringent constraints on the equation of state of asymmetric matter. We this view in mind, we focus on two modes of excitation that are essential in reaching this goal: the isoscalar giant monopole resonance (GMR) and the isovector giant dipole resonance (GDR). GMR energies in heavy nuclei are sensitive to the symmetry energy because they probe the incompressibility of neutron-rich matter. Unfortunately, access to the symmetry energy is hindered by the relatively low neutron-proton asymmetry of stable nuclei. Thus, the measurement of GMR energies in exotic nuclei is strongly encouraged. In the case of the GDR, we find the electric dipole polarizability of paramount importance. Indeed, the electric dipole polarizability appears as one of two laboratory observables -- with the neutron-skin thickness being the other -- that are highly sensitive to the density dependence of the symmetry energy. Finally, we identify the softness of skin and the nature of the pygmy resonance as important unsolved problems in nuclear structure.

J. Piekarewicz

2013-07-29T23:59:59.000Z

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361

Cloud Auto-Scaling with Deadline and Budget Constraints  

E-Print Network (OSTI)

Abstract—Clouds have become an attractive computing platform which offers on-demand computing power and storage capacity. Its dynamic scalability enables users to quickly scale up and scale down underlying infrastructure in response to business volume, performance desire and other dynamic behaviors. However, challenges arise when considering computing instance non-deterministic acquisition time, multiple VM instance types, unique cloud billing models and user budget constraints. Planning enough computing resources for user desired performance with less cost, which can also automatically adapt to workload changes, is not a trivial problem. In this paper, we present a cloud auto-scaling mechanism to automatically scale computing instances based on workload information and performance desire. Our mechanism schedules VM instance startup and shut-down activities. It enables cloud applications to finish submitted jobs within the deadline by controlling underlying instance numbers and reduces user cost by choosing appropriate instance types. We have implemented our mechanism in Windows Azure platform, and evaluated it using both simulations and a real scientific cloud application. Results show that our cloud auto-scaling mechanism can meet user specified performance goal with less cost. Keywords-cloud computing; auto-scaling; dynamic scalability; integer programming I.

Ming Mao; Jie Li; Marty Humphrey

2010-01-01T23:59:59.000Z

362

Photon and graviton mass limits  

Science Conference Proceedings (OSTI)

We review past and current studies of possible long-distance, low-frequency deviations from Maxwell electrodynamics and Einstein gravity. Both have passed through three phases: (1) Testing the inverse-square laws of Newton and Coulomb, (2) Seeking a nonzero value for the rest mass of photon or graviton, and (3) Considering more degrees of freedom, allowing mass while preserving gauge or general-coordinate invariance. For electrodynamics there continues to be no sign of any deviation. Since our previous review the lower limit on the photon Compton wavelength (associated with weakening of electromagnetic fields in vacuum over large distance scale) has improved by four orders of magnitude, to about one astronomical unit. Rapid current progress in astronomical observations makes it likely that there will be further advances. These ultimately could yield a bound exceeding galactic dimensions, as has long been contemplated. Meanwhile, for gravity there have been strong arguments about even the concept of a graviton rest mass. At the same time there are striking observations, commonly labeled 'dark matter' and 'dark energy' that some argue imply modified gravity. This makes the questions for gravity much more interesting. For dark matter, which involves increased attraction at large distances, any explanation by modified gravity would be qualitatively different from graviton mass. Because dark energy is associated with reduced attraction at large distances, it might be explained by a graviton-mass-like effect.

Nieto, Michael [Los Alamos National Laboratory; Goldhaber Scharff, Alfred [SUNY

2008-01-01T23:59:59.000Z

363

Diagnostic Pressure Equation as a Weak Constraint in a Storm-Scale Three-Dimensional Variational Radar Data Assimilation System  

Science Conference Proceedings (OSTI)

A diagnostic pressure equation is incorporated into a storm-scale three-dimensional variational data assimilation (3DVAR) system in the form of a weak constraint in addition to a mass continuity equation constraint (MCEC). The goal of this ...

Guoqing Ge; Jidong Gao; Ming Xue

2012-08-01T23:59:59.000Z

364

OBJECT RECONSTRUCTION PROBLEMS IN RADIATION IMAGING WITH LIMITED ANGULAR INPUT  

E-Print Network (OSTI)

the object space and projection space has been shown to givethe constraints of the projection data. It is shown in this

Tarn, K.C.

2013-01-01T23:59:59.000Z

365

OBSERVATIONAL CONSTRAINTS ON THE DEGENERATE MASS-RADIUS RELATION  

SciTech Connect

The white dwarf mass-radius relationship is fundamental to modern astrophysics. It is central to routine estimation of DA white dwarf masses derived from spectroscopic temperatures and gravities. It is also the basis for observational determinations of the white dwarf initial-final-mass relation. Nevertheless, definitive and detailed observational confirmations of the mass-radius relation (MRR) remain elusive owing to a lack of sufficiently accurate white dwarf masses and radii. Current best estimates of masses and radii allow only broad conclusions about the expected inverse relation between masses and radii in degenerate stars. In this paper, we examine a restricted set of 12 DA white dwarf binary systems for which accurate (1) trigonometric parallaxes, (2) spectroscopic effective temperatures and gravities, and (3) gravitational redshifts are available. We consider these three independent constraints on mass and radius in comparison with an appropriate evolved MRR for each star. For the best-determined systems it is found that the DA white dwarfs conform to evolve theoretical MRRs at the 1{sigma} to 2{sigma} level. For the white dwarf 40 Eri B (WD 0413-077) we find strong evidence for the existence of a 'thin' hydrogen envelope. For other stars improved parallaxes will be necessary before meaningful comparisons are possible. For several systems current parallaxes approach the precision required for the state-of-the-art mass and radius determinations that will be obtained routinely from the Gaia mission. It is demonstrated here how these anticipated results can be used to firmly constrain details of theoretical mass-radius determinations.

Holberg, J. B. [Lunar and Planetary Laboratory, 1541 East University Boulevard, Sonett Space Sciences Building, University of Arizona, Tucson, AZ 85721 (United States); Oswalt, T. D. [Florida Institute of Technology, Melbourne, FL 32901 (United States); Barstow, M. A., E-mail: holberg@argus.lpl.arizona.edu, E-mail: toswalt@fit.edu, E-mail: mab@le.ac.uk [Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH (United Kingdom)

2012-03-15T23:59:59.000Z

366

Generalized LTB model with Inhomogeneous Isotropic Dark Energy: Observational Constraints  

E-Print Network (OSTI)

We consider on-center and off-center observers in an inhomogeneous, spherically symmetric, isocurvature (flat) concentration of dark energy with typical size of a few Gpc. Such a concentration could be produced e.g. by a recently formed global monopole with core size that approaches the Hubble scale. In this case we would have what may be called `topological quintessence' in analogy with the well-known topological inflation. We show that the minimum comoving radius r_{0min} of such a dark energy inhomogeneity that is consistent with the Union2 Type Ia supernovae (SnIa) data at the 3\\sigma level is r_{0min}\\simeq 1.8 Gpc. As expected, the best-fit fractional dark energy density at the center, \\Omega_X,in, approaches the corresponding LCDM value \\Omega_X,in =0.73 for large enough values of the inhomogeneity radius r_0 (r_0 > 4Gpc). Using the Union2 data, we show that the maximum allowed shift r_{obs-max} of the observer from the center of the inhomogeneity is about 0.7 r_0 which respects the Copernican principle. The model naturally predicts the existence of a preferred axis and alignment of the low CMB multipoles. However, the constraints on r_{obs-max} coming from the magnitude of the CMB dipole remain a severe challenge to the Copernican principle and lead to r_{obs-max}< 110 Mpc even for an inhomogeneity radius as large as r_0=7 Gpc.

J. Grande; L. Perivolaropoulos

2011-03-21T23:59:59.000Z

367

Supernova constraints on Multi-coupled Dark Energy  

E-Print Network (OSTI)

The persisting consistency of ever more accurate observational data with the predictions of the standard LCDM cosmological model puts severe constraints on possible alternative scenarios, but still does not shed any light on the fundamental nature of the cosmic dark sector.As large deviations from a LCDM cosmology are ruled out by data, the path to detect possible features of alternative models goes necessarily through the definition of cosmological scenarios that leave almost unaffected the background and -- to a lesser extent -- the linear perturbations evolution of the universe. In this context,the Multi-coupled DE (McDE) model was proposed by Baldi 2012 as a particular realization of an interacting Dark Energy field characterized by an effective screening mechanism capable of suppressing the effects of the coupling at the background and linear perturbation level. In the present paper, for the first time, we challenge the McDE scenario through a direct comparison with real data, in particular with the luminosity distance of Type Ia supernovae. By studying the existence and stability conditions of the critical points of the associated background dynamical system, we select only the cosmologically consistent solutions, and confront their background expansion history with data. Confirming previous qualitative results, the McDE scenario appears to be fully consistent with the adopted sample of Type Ia supernovae, even for coupling values corresponding to an associated scalar fifth-force about four orders of magnitude stronger than standard gravity. Our analysis demonstrates the effectiveness of the McDE background screening, and shows some new non-trivial asymptotic solutions for the future evolution of the universe. Our results show how the background expansion history might be highly insensitive to the fundamental nature and to the internal complexity of the dark sector. [Abridged

Arpine Piloyan; Valerio Marra; Marco Baldi; Luca Amendola

2013-05-14T23:59:59.000Z

368

Core Analysis For The Development And Constraint Of Physical Models Of  

Open Energy Info (EERE)

For The Development And Constraint Of Physical Models Of For The Development And Constraint Of Physical Models Of Geothermal Reservoirs Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Report: Core Analysis For The Development And Constraint Of Physical Models Of Geothermal Reservoirs Details Activities (2) Areas (2) Regions (0) Abstract: Effective reservoir exploration, characterization, and engineering require a fundamental understanding of the geophysical properties of reservoir rocks and fracture systems. Even in the best of circumstances, spatial variability in porosity, fracture density, salinity, saturation, tectonic stress, fluid pressures, and lithology can all potentially produce and/or contribute to geophysical anomalies. As a result, serious uniqueness problems frequently occur when interpreting

369

Demonstration of the reactivity constraint approach on SNL's annual core research reactor  

Science Conference Proceedings (OSTI)

This paper reports on the initial demonstration of the reactivity constraint approach and its implementing algorithm, the MIT-CSDL Non-Linear Digital Controller, on the annual core research reactor (ACCR) that is operated by the Sandia National Laboratories. This demonstration constituted the first use of reactivity constraints for the closed-loop, digital control of reactor power on a facility other than the Massachusetts Institute of Technology's (MIT's) research reactor (MITR-II). Also, because the ACRR and the MITR-II are of very different design, these trials established the generic nature of the reactivity constraint approach.

Bernard, J.A.; Kwok, K.S.; Wyant, F.J.; Thome, F.V.

1989-01-01T23:59:59.000Z

370

SU(N) group-theory constraints on color-ordered five-point amplitudes at all loop orders  

E-Print Network (OSTI)

Color-ordered amplitudes for the scattering of n particles in the adjoint representation of SU(N) gauge theory satisfy constraints arising solely from group theory. We derive these constraints for n=5 at all loop orders using an iterative approach. These constraints generalize well-known tree-level and one-loop group theory relations.

Alexander C. Edison; Stephen G. Naculich

2011-11-16T23:59:59.000Z

371

SU(N) group-theory constraints on color-ordered five-point amplitudes at all loop orders  

E-Print Network (OSTI)

Color-ordered amplitudes for the scattering of n particles in the adjoint representation of SU(N) gauge theory satisfy constraints arising solely from group theory. We derive these constraints for n=5 at all loop orders using an iterative approach. These constraints generalize well-known tree-level and one-loop group theory relations.

Edison, Alexander C

2011-01-01T23:59:59.000Z

372

Definition: Fault Current Limiter | Open Energy Information  

Open Energy Info (EERE)

Limiter Limiter Jump to: navigation, search Dictionary.png Fault Current Limiter A fault current limiter prevents current in an electrical circuit from exceeding a predetermined level by increasing the electrical impedance of that circuit before the current through the circuit exceeds that level. Fault current limiters are designed so as to minimize the impedance of the circuit under normal conditions to reduce losses, but increase the impedance of the circuit under fault conditions to limit fault current.[1] View on Wikipedia Wikipedia Definition A Fault Current Limiter (FCL) is a device which limits the prospective fault current when a fault occurs (e.g. in a power transmission network). The term includes superconducting devices and non-superconducting devices, however some of the more simple non-superconducting devices (such

373

Gujarat Ambuja Cements Limited | Open Energy Information  

Open Energy Info (EERE)

Ambuja Cements Limited Ambuja Cements Limited Jump to: navigation, search Name Gujarat Ambuja Cements Limited Place Mumbai, India Zip 400 021 Sector Biomass Product Indian cement company. the company installed a 24MW biomass based captive electric generating stations that will provide electricity to Gujarat Ambuja Cements Limitedâ€(tm)s (“GACL”) facility in Ropar, Punjab. References Gujarat Ambuja Cements Limited[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Gujarat Ambuja Cements Limited is a company located in Mumbai, India . References ↑ "Gujarat Ambuja Cements Limited" Retrieved from "http://en.openei.org/w/index.php?title=Gujarat_Ambuja_Cements_Limited&oldid=346290

374

Definition: Fault Current Limiting | Open Energy Information  

Open Energy Info (EERE)

Limiting Limiting Jump to: navigation, search Dictionary.png Fault Current Limiting Fault current limiting can be achieved through sensors, communications, information processing, and actuators that allow the utility to use a higher degree of network coordination to reconfigure the system to prevent fault currents from exceeding damaging levels. Fault current limiting can also be achieved through the implementation of special stand alone devices known as Fault Current Limiters (FCLs) which act to automatically limit high through currents that occur during faults.[1] Related Terms fault, fault current limiter References ↑ SmartGrid.gov 'Description of Functions' Temp LikeLike UnlikeLike You like this.Sign Up to see what your friends like. late:ISGANAttributionsmart grid,smart grid,smart grid,smart grid,

375

Graduate Program Time Limits and Work Schedules  

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

Time Limits and Work Schedules Graduate Program Time Limits and Work Schedules Point your career towards LANL: work with the best minds on the planet in an inclusive environment...

376

Fundamental Limits to Position Determination by Concentration Gradients  

E-Print Network (OSTI)

Position determination in biological systems is often achieved through protein concentration gradients. Measuring the local concentration of such a protein with a spatially-varying distribution allows the measurement of position within the system. In order for these systems to work effectively, position determination must be robust to noise. Here, we calculate fundamental limits to the precision of position determination by concentration gradients due to unavoidable biochemical noise perturbing the gradients. We focus on gradient proteins with first order reaction kinetics. Systems of this type have been experimentally characterised in both developmental and cell biology settings. For a single gradient we show that, through time-averaging, great precision can potentially be achieved even with very low protein copy numbers. As a second example, we investigate the ability of a system with oppositely directed gradients to find its centre. With this mechanism, positional precision close to the centre improves more slowly with increasing averaging time, and so longer averaging times or higher copy numbers are required for high precision. For both single and double gradients, we demonstrate the existence of optimal length scales for the gradients, where precision is maximized, as well as analyzing how precision depends on the size of the concentration measuring apparatus. Our results provide fundamental constraints on the positional precision supplied by concentration gradients in various contexts, including both in developmental biology and also within a single cell.

Filipe Tostevin; Pieter Rein ten Wolde; Martin Howard

2007-04-26T23:59:59.000Z

377

Towards Sustainable Material Usage: Investigating Limits to ...  

Science Conference Proceedings (OSTI)

Presentation Title, Towards Sustainable Material Usage: Investigating Limits to ... secondary resources decreases energy consumption; this energy advantage ...

378

Affine parametrization of the dark sector: Constraints from WMAP5 and SDSS  

SciTech Connect

We study a set of universe models where the dark sector is described by a perfect fluid with an affine equation of state P=P{sub 0}+{alpha}{rho}, focusing specifically on cosmological perturbations in a flat universe. We perform a Monte Carlo Markov Chain analysis spanning the full parameter space of the model using the WMAP 5-yr data and the SDSS LRG4 survey. The affine fluid can either play the role of a unified dark matter, accounting for both dark matter and a cosmological constant, or work alongside cold dark matter (CDM), as a form of dark energy. A key ingredient is the sound speed, that depends on the nature of the fluid and that, for any given background model, adds a degree of freedom to the perturbations: in the barotropic case the square of the sound speed is simply equal to the affine parameter {alpha}; if entropic perturbations are present the effective sound speed has to be specified as an additional parameter. In addition to the barotropic case, we consider the two limiting cases of effective sound speed equal to 0 or 1. For {alpha}=c{sub s}{sup 2}=0 our unified dark matter model is equivalent to the standard {lambda}CDM with adiabatic perturbations. Apart of a trivial subcase, all models considered satisfy the data constraints, with quite standard values for the usual cosmological parameters. In general our analysis confirms that cosmological data sets require both a collisionless massive and cold component to form the potential wells that lead to structure formation, and an effective cosmological constant that drives the late accelerated expansion.

Pietrobon, Davide; Bruni, Marco [Institute of Cosmology and Gravitation, University of Portsmouth, Mercantile House, Portsmouth PO1 2EG (United Kingdom); Dipartimento di Fisica, Universita di Roma 'Tor Vergata', via della Ricerca Scientifica 1, 00133 Roma (Italy); Balbi, Amedeo [Dipartimento di Fisica, Universita di Roma 'Tor Vergata', via della Ricerca Scientifica 1, 00133 Roma (Italy); INFN Sezione di Roma 'Tor Vergata', via della Ricerca Scientifica 1, 00133 Roma (Italy); Quercellini, Claudia [Dipartimento di Fisica, Universita di Roma 'Tor Vergata', via della Ricerca Scientifica 1, 00133 Roma (Italy)

2008-10-15T23:59:59.000Z

379

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

380

Primordial magnetic field limits from cosmological data  

SciTech Connect

We study limits on a primordial magnetic field arising from cosmological data, including that from big bang nucleosynthesis, cosmic microwave background polarization plane Faraday rotation limits, and large-scale structure formation. We show that the physically relevant quantity is the value of the effective magnetic field, and limits on it are independent of how the magnetic field was generated.

Kahniashvili, Tina [McWilliams Center for Cosmology and Department of Physics, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213 (United States); Department of Physics, Laurentian University, Ramsey Lake Road, Sudbury, Ontario P3E 2C (Canada); Abastumani Astrophysical Observatory, Ilia State University, 2A Kazbegi Ave, Tbilisi, GE-0160 (Georgia); Tevzadze, Alexander G. [Abastumani Astrophysical Observatory, Ilia State University, 2A Kazbegi Ave, Tbilisi, GE-0160 (Georgia); Faculty of Exact and Natural Sciences, Tbilisi State University, 1 Chavchavadze Avenue, Tbilisi, GE-0128 (Georgia); Sethi, Shiv K. [McWilliams Center for Cosmology and Department of Physics, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennsylvania 15213 (United States); Raman Research Institute, Sadashivanagar, Bangalore 560080 (India); Pandey, Kanhaiya [Raman Research Institute, Sadashivanagar, Bangalore 560080 (India); Ratra, Bharat [Department of Physics, Kansas State University, 116 Cardwell Hall, Manhattan, Kansas 66506 (United States)

2010-10-15T23:59:59.000Z

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


381

Ups and downs of demand limiting  

SciTech Connect

Electric power load management by limiting power demand can be used for energy conservation. Methods for affecting demand limiting, reducing peak usage in buildings, particularly usage for heating and ventilating systems, and power pricing to encourage demand limiting are discussed. (LCL)

Pannkoke, T.

1976-12-01T23:59:59.000Z

382

Cosmic String constraints from WMAP and the South Pole Telescope  

E-Print Network (OSTI)

The predictions of the inflationary LCDM paradigm match today's high-precision measurements of the cosmic microwave background anisotropy extremely well. The same data put tight limits on other sources of anisotropy. Cosmic strings are a particularly interesting alternate source to constrain. Strings are topological defects, remnants of inflationary-era physics that persist after the big bang. They are formed in a variety of models of inflation, including string theory models such as brane inflation. We assume a "Nambu-Goto" model for strings, approximated by a collection of unconnected segments with zero width, and show that measurements of temperature anisotropy by the South Pole Telescope break a parameter degeneracy in the WMAP data, permitting us to place a strong upper limit on the possible string contribution to the CMB anisotropy: the power sourced by zero-width strings must be <1.75% (95% CL) of the total or the string tension Gmu <1.7x10^{-7}. These limits imply that the best hope for detecting strings in the CMB will come from B-mode polarization measurements at arcminute scales rather than the degree scale measurements pursued for gravitational wave detection.

Cora Dvorkin; Mark Wyman; Wayne Hu

2011-09-22T23:59:59.000Z

383

V-040: Apache Tomcat Bug Lets Remote Users Bypass Security Constraints |  

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

0: Apache Tomcat Bug Lets Remote Users Bypass Security 0: Apache Tomcat Bug Lets Remote Users Bypass Security Constraints V-040: Apache Tomcat Bug Lets Remote Users Bypass Security Constraints December 5, 2012 - 1:00am Addthis PROBLEM: Apache Tomcat Bug Lets Remote Users Bypass Security Constraints PLATFORM: Version(s): 6.0.0 - 6.0.35, 7.0.0 - 7.0.29 ABSTRACT: A vulnerability was reported in Apache Tomcat. REFERENCE LINKS: Apache Tomcat Red Hat Bugzilla - Bug 883634 SecurityTracker Alert ID: 1027833 CVE-2012-3546 IMPACT ASSESSMENT: High DISCUSSION: When using FORM authentication it was possible to bypass the security constraint checks in the FORM authenticator by appending /j_security_check to the end of the URL if some other component (such as the Single-Sign-On valve) had called request.setUserPrincipal() before the call to

384

Raising the Roof: California Housing Development Projections and Constraints, 1997-2020  

E-Print Network (OSTI)

Constraints, 1997-2020 Statewide Housing Plan Update Stateof 220,000 housing units each year between now and 2020.s projected housing needs through the year 2020, the

Landis, John D.

2000-01-01T23:59:59.000Z

385

Distributed Detection of Multi-Hop Information Flows With Fusion Capacity Constraints  

E-Print Network (OSTI)

The problem of detecting multihop information flows subject to communication constraints is considered. In a distributed detection scheme, eavesdroppers are deployed near nodes in a network, each able to measure the ...

Agaskar, Ameya P.

386

Impact of unit commitment constraints on generation expansion planning with renewables  

E-Print Network (OSTI)

Growing use of renewables pushes thermal generators against operating constraints - e.g. ramping, minimum output, and operating reserves - that are traditionally ignored in expansion planning models. We show how including ...

Palmintier, Bryan Stephen

387

WETAS: A Web-Based Authoring System for Constraint-Based ITS  

Science Conference Proceedings (OSTI)

Constraint-Based Modelling (CBM) is a student modelling technique for Intelligent Tutoring Systems (ITS) that is rapidly maturing. We have implemented several tutors using CBM, and demonstrated their suitability to, in particular, open-ended domains. ...

Brent Martin; Antonija Mitrovic

2002-05-01T23:59:59.000Z

388

A Theory of Variational Assimilation with Kalman Filter–Type Constraints: Bias and Lagrange Multiplier  

Science Conference Proceedings (OSTI)

A theoretical study is made on the variational formulation of data assimilation with Kalman filter–type constraints in discrete form, and a time-forward integration scheme is developed in order to primarily reduce bias and increase computer ...

Yoshi K. Sasaki

2003-11-01T23:59:59.000Z

389

Design of parallel flexure systems via Freedom and Constraint Topologies (FACT)  

E-Print Network (OSTI)

The aim of this thesis was to generate the knowledge required to represent the possible freedom topologies (motions of a mechanism) and the possible constraint topologies (flexural elements that guide the mechanism) in a ...

Hopkins, Jonathan B. (Jonathan Brigham)

2007-01-01T23:59:59.000Z

390

MVRC heuristic for solving the multi-choice multi-constraint knapsack problem  

Science Conference Proceedings (OSTI)

This paper presents the heuristic algorithm Maximizing Value per Resources Consumption (MVRC) that solves the Multi-Choice Multi-Constraint Knapsack Problem, a variant of the known NP-hard optimization problem called Knapsack problem. Starting with an ...

Maria Chantzara; Miltiades Anagnostou

2006-05-01T23:59:59.000Z

391

Exploring the use of constraint programming for enforcing connectivity during graph generation  

E-Print Network (OSTI)

Brown,K.N. Prosser,P. Beck,J.C. Wu,C.W. The Fifth Workshop on Modelling and Solving Problems with Constraints, held at the 19th International Joint Conference on Artificial Intelligence (IJCAI 2005)

Brown, K.N.; Prosser, P.

392

Comparing the use of symmetry in constraint processing and model checking  

E-Print Network (OSTI)

Donaldson,A. Miller,A. Calder,M. Proceedings of the the 4th International Workshop on Symmetry and Constraint Satisfaction Problems (SymCon'04) pp 18-25

Donaldson, A.

393

Potential Vorticity Constraints on the Dynamics and Hydrography of the Southern Ocean  

Science Conference Proceedings (OSTI)

Constraints on the hydrography and geostrophic velocity shear of the Southern Ocean implicit in its potential vorticity field are discussed and illustrated by diagnostic study of observed and modeled potential vorticity fields. A stress-driven, ...

John Marshall; Dirk Olbers; Hagen Ross; Dieter Wolf-Gladrow

1993-03-01T23:59:59.000Z

394

Computing Cournot Equilibria in Two Settlement Electricity Markets with Transmission Constraints  

Science Conference Proceedings (OSTI)

We formulate a two-settlement equilibrium in competitive electricity markets as a subgame-perfect Nash equilibrium in which each generation .rm solves a Mathematical Program with Equilibrium Constraints (MPEC), given other firms' forward and spot strategies. ...

2004-01-01T23:59:59.000Z

395

Geochemical and rheological constraints on the dynamics of the oceanic upper mantle  

E-Print Network (OSTI)

I provide constraints on mantle convection through observations of the rheology and composition of the oceanic upper mantle. Convection cannot be directly observed, yet is a fundamental part of the plate tectonic cycle. ...

Warren, Jessica Mendelsohn

2007-01-01T23:59:59.000Z

396

SASS Wind Ambiguity Removal by Direct Minimization. Part II: Use of Smoothness and Dynamical Constraints  

Science Conference Proceedings (OSTI)

Variational analysis methods allow information from a variety of sources, including current observations and a priori statistics and constraints, to be combined by minimizing the lack of fit to the various sources of information. In this study, ...

Ross N. Hoffman

1984-09-01T23:59:59.000Z

397

On the Robustness of Emergent Constraints Used in Multimodel Climate Change Projections of Arctic Warming  

Science Conference Proceedings (OSTI)

Statistical relationships between future and historical model runs in multimodel ensembles (MMEs) are increasingly exploited to make more constrained projections of climate change. However, such emergent constraints may be spurious and can arise ...

Thomas J. Bracegirdle; David B. Stephenson

2013-01-01T23:59:59.000Z

398

Minimum Energy Transmission Over a Wireless Channel With Deadline and Power Constraints  

E-Print Network (OSTI)

We consider optimal rate-control for energy-efficient transmission of data, over a time-varying channel, with packet-deadline constraints. Specifically, the problem scenario consists of a wireless transmitter with B units ...

Zafer, Murtaza

399

The air pollution constraints considered best generation mix using fuzzy linear programming  

Science Conference Proceedings (OSTI)

A new approach considering SOx, NOX and CO2 air pollution constraints in the long-term generation mix with multi-criteria is proposed under uncertain circumstances. Specially, CO2 emission of electricity system industry ...

Jaeseok Choi; TrungTinh Tran; Jungji Kwon; Sangsik Lee; Abdurrahim El-keib

2005-09-01T23:59:59.000Z

400

Constraint-Based Simulation of Biological Systems Described by Molecular Interaction Maps  

Science Conference Proceedings (OSTI)

We present a method to simulate biochemical networks described by the graphical notation of Molecular Inter- action Maps within stochastic Concurrent Constraint Pro- gramming. Such maps are compact, as they represent im- plicitly a wide set of reactions, ...

Luca Bortolussi; Simone Fonda; Alberto Policriti

2007-11-01T23:59:59.000Z

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


401

In-domain relation discovery with meta-constraints via posterior regularization  

Science Conference Proceedings (OSTI)

We present a novel approach to discovering relations and their instantiations from a collection of documents in a single domain. Our approach learns relation types by exploiting meta-constraints that characterize the general qualities of a good ...

Harr Chen; Edward Benson; Tahira Naseem; Regina Barzilay

2011-06-01T23:59:59.000Z

402

In-domain relation discovery with meta-constraints via posterior regularization  

E-Print Network (OSTI)

We present a novel approach to discovering relations and their instantiations from a collection of documents in a single domain. Our approach learns relation types by exploiting meta-constraints that characterize the general ...

Chen, Harr

403

Localization of Deep Water Formation: Role of Atmospheric Moisture Transport and Geometrical Constraints on Ocean Circulation  

Science Conference Proceedings (OSTI)

A series of coupled atmosphere–ocean–ice aquaplanet experiments is described in which topological constraints on ocean circulation are introduced to study the role of ocean circulation on the mean climate of the coupled system. It is imagined ...

David Ferreira; John Marshall; Jean-Michel Campin

2010-03-01T23:59:59.000Z

404

Inverse Analysis Adjustment of the SOC Air–Sea Flux Climatology Using Ocean Heat Transport Constraints  

Science Conference Proceedings (OSTI)

Results are presented from a linear inverse analysis of the Southampton Oceanography Centre (SOC) air–sea flux climatology using 10 hydrographic ocean heat transport constraints distributed throughout the Atlantic and North Pacific Oceans. A ...

Jeremy P. Grist; Simon A. Josey

2003-10-01T23:59:59.000Z

405

Two stage constraint based hybrid approach to free word order language dependency parsing  

Science Conference Proceedings (OSTI)

The paper describes the overall design of a new two stage constraint based hybrid approach to dependency parsing. We define the two stages and show how different grammatical construct are parsed at appropriate stages. This division leads to selective ...

Akshar Bharati; Samar Husain; Dipti Misra; Rajeev Sangal

2009-10-01T23:59:59.000Z

406

Constraints on the utilisation of the invasive Chinese tallow tree Sapium sebiferum by generalist native  

E-Print Network (OSTI)

Constraints on the utilisation of the invasive Chinese tallow tree Sapium sebiferum by generalist prairie vegetation and a seedling of either introduced Sapium sebiferum (Chinese tallow tree) or native

Siemann, Evan

407

Chandra constraints on the thermal conduction in the intracluster plasma of A2142  

E-Print Network (OSTI)

In this Letter, we use the recent Chandra observation of A2142 reported by Markevitch et al. to put constraints on thermal conduction in the intracluster plasma. We show that the observed sharp temperature gradient requires that classical conductivity has to be reduced at least by a factor of between 250 and 2500. The result provides a direct constraint on an important physical process relevant to the gas in the cores of clusters of galaxies.

S. Ettori; A. C. Fabian

2000-07-26T23:59:59.000Z

408

Can the Chameleon mechanism explain cosmic acceleration while satisfying Solar System constraints ?  

E-Print Network (OSTI)

The chameleon mechanism appearing in massive tensor-scalar theory of gravity can effectively reduce the nonminimal coupling between the scalar field and matter. This mechanism is invoked to reconcile cosmological data requiring introduction of Dark Energy with small-scale stringent constraints on General Relativity. In this communication, we present constraints on this mechanism obtained by a cosmological analysis (based on Supernovae Ia data) and by a Solar System analysis (based on PPN formalism).

A. Hees; A. Füzfa

2013-02-26T23:59:59.000Z

409

ICECUBE NONDETECTION OF GAMMA-RAY BURSTS: CONSTRAINTS ON THE FIREBALL PROPERTIES  

SciTech Connect

The increasingly deep limit on the neutrino emission from gamma-ray bursts (GRBs) with IceCube observations has reached a level that could place useful constraints on the fireball properties. We first present a revised analytic calculation of the neutrino flux that predicts a flux of one order of magnitude lower than that obtained by the IceCube Collaboration. For the benchmark model parameters (e.g., the bulk Lorentz factor is {Gamma} = 10{sup 2.5}, the observed variability time for the long GRBs is t{sup ob}{sub v} = 0.01 s, and the ratio between the energy in the accelerated protons and in the radiation is {eta}{sub p} = 10 for every burst) in the standard internal shock scenario, the predicted neutrino flux from 215 bursts during the period of the 40- and 59-string configurations is a factor of {approx}3 below the IceCube sensitivity. However, if we accept the recently found inherent relation between the bulk Lorentz factor and the burst energy, then the expected neutrino flux significantly increases and the spectral peak shifts to a lower energy. In this case, the nondetection implies that the baryon-loading ratio should be {eta}{sub p} {approx}< 10 if the variability time of the long GRBs is fixed to t{sup ob}{sub v} = 0.01 s. Instead, if we relax the standard internal-shock scenario but still assume {eta}{sub p} = 10, then the nondetection constrains the dissipation radius, R {approx}> 4 Multiplication-Sign 10{sup 12} cm, assuming the same dissipation radius for every burst and benchmark parameters for the fireballs. We also calculate the diffuse neutrino flux from the GRBs for different luminosity functions from the literature. The expected flux exceeds the current IceCube limit for some of the luminosity functions, and, thus, the nondetection constrains {eta}{sub p} {approx}< 10 when the variability time of the long GRBs is fixed at t{sup ob}{sub v} = 0.01 s.

He Haoning; Liu Ruoyu; Wang Xiangyu; Dai Zigao [School of Astronomy and Space Science, Nanjing University, Nanjing 210093 (China); Nagataki, Shigehiro [Yukawa Institute for Theoretical Physics, Kyoto University, Oiwakecho, Kitashirakawa, Sakyoku, Kyoto 606-8502 (Japan); Murase, Kohta, E-mail: haoninghe@nju.edu.cn, E-mail: ryliu@nju.edu.cn, E-mail: xywang@nju.edu.cn [Department of Physics, Center for Cosmology and AstroParticle Physics, Ohio State University, Columbus, OH 43210 (United States)

2012-06-10T23:59:59.000Z

410

Carbon Trust Enterprises Limited | Open Energy Information  

Open Energy Info (EERE)

Enterprises Limited Enterprises Limited Jump to: navigation, search Name Carbon Trust Enterprises Limited Place London, United Kingdom Zip WC2A 2AZ Sector Carbon Product Carbon Trust Enterprises creates and invests in new, high growth, carbon reducing businesses. Typically the company focuses on use of mature technologies rather than on technology innovations. References Carbon Trust Enterprises Limited[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Carbon Trust Enterprises Limited is a company located in London, United Kingdom . References ↑ "Carbon Trust Enterprises Limited" Retrieved from "http://en.openei.org/w/index.php?title=Carbon_Trust_Enterprises_Limited&oldid=343250"

411

Impact Capital Partners Limited | Open Energy Information  

Open Energy Info (EERE)

Limited Limited Jump to: navigation, search Name Impact Capital Partners Limited Place Los Angeles, California Zip CA 90067-1509 Product Los Angeles-based, investment intermediary that designs financial solutions and innovative strategies for achieving sustained growth and intrinsic value. References Impact Capital Partners Limited[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Impact Capital Partners Limited is a company located in Los Angeles, California . References ↑ "Impact Capital Partners Limited" Retrieved from "http://en.openei.org/w/index.php?title=Impact_Capital_Partners_Limited&oldid=346814" Categories: Clean Energy Organizations Companies

412

Bharat Electronics Limited BEL | Open Energy Information  

Open Energy Info (EERE)

Limited BEL Limited BEL Jump to: navigation, search Name Bharat Electronics Limited (BEL) Place Bangalore, India Zip 560015 Sector Solar Product Major supplier of products and turnkey systems with expertise in solar products and systems, defence communication, radars & sensors, telecommunication, broadcasting equipments, e-governance networks and other components. References Bharat Electronics Limited (BEL)[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. Bharat Electronics Limited (BEL) is a company located in Bangalore, India . References ↑ "Bharat Electronics Limited (BEL)" Retrieved from "http://en.openei.org/w/index.php?title=Bharat_Electronics_Limited_BEL&oldid=342709

413

THE METALLICITY DISTRIBUTION FUNCTIONS OF SEGUE G AND K DWARFS: CONSTRAINTS FOR DISK CHEMICAL EVOLUTION AND FORMATION  

SciTech Connect

We present the metallicity distribution function (MDF) for 24,270 G and 16,847 K dwarfs at distances from 0.2 to 2.3 kpc from the Galactic plane, based on spectroscopy from the Sloan Extension for Galactic Understanding and Exploration (SEGUE) survey. This stellar sample is significantly larger in both number and volume than previous spectroscopic analyses, which were limited to the solar vicinity, making it ideal for comparison with local volume-limited samples and Galactic models. For the first time, we have corrected the MDF for the various observational biases introduced by the SEGUE target-selection strategy. SEGUE is particularly notable for its sample of K dwarfs, which are too faint to examine spectroscopically far from the solar neighborhood. The MDF of both spectral types becomes more metal-poor with increasing |Z|, which reflects the transition from a sample with small [{alpha}/Fe] values at small heights to one with enhanced [{alpha}/Fe] above 1 kpc. Comparison of our SEGUE distributions to those of two different Milky Way models reveals that both are more metal-rich than our observed distributions at all heights above the plane. Our unbiased observations of G and K dwarfs provide valuable constraints over the |Z|-height range of the Milky Way disk for chemical and dynamical Galaxy evolution models, previously only calibrated to the solar neighborhood, with particular utility for thin- and thick-disk formation models.

Schlesinger, Katharine J. [Research School of Astronomy and Astrophysics, Australian National University, Weston, ACT 2611 (Australia); Johnson, Jennifer A.; Schoenrich, Ralph [Department of Astronomy, The Ohio State University, 140 W 18th Avenue, Columbus, OH 43210 (United States); Rockosi, Constance M. [UCO/Lick Observatory, University of California, Santa Cruz, CA 95064 (United States); Lee, Young Sun [Tombaugh Fellow, Department of Astronomy, New Mexico State University, Las Cruces, NM 88003 (United States); Morrison, Heather L.; Harding, Paul [Department of Astronomy, Case Western Reserve University, Cleveland, OH 44106 (United States); Allende Prieto, Carlos [Instituto de Astrofisica de Canarias, E-38205 La Laguna, Tenerife (Spain); Beers, Timothy C. [Department of Physics and Astronomy and JINA (Joint Institute for Nuclear Astrophysics), Michigan State University, East Lansing, MI 48824 (United States); Yanny, Brian [Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510 (United States); Schneider, Donald P. [Department of Astronomy and Astrophysics, Penn State University, 408A Davey Laboratory, University Park, PA 16802 (United States); Chiappini, Cristina; Da Costa, Luiz N.; Maia, Marcio A. G.; Rocha-Pinto, Helio; Santiago, Basilio X. [Laboratorio Interinstitucional de e-Astronomia (LIneA), Rua Gal. Jose Cristino 77, 20921-400 Rio de Janeiro (Brazil); Minchev, Ivan [Leibniz-Institut fuer Astrophysik Potsdam, An der Sternwarte 16, D-14482 Potsdam (Germany)

2012-12-20T23:59:59.000Z

414

Implications of Direct Dark Matter Constraints for Minimal Supersymmetric Standard Model Higgs Boson Searches at the Tevatron  

E-Print Network (OSTI)

Searches for the Minimal Supersymmetric Standard Model (MSSM) Higgs bosons are among the most promising channels for exploring new physics at the Tevatron. In particular, interesting regions of large $\\tan \\beta$ and small $m_A$ are probed by searches for heavy neutral Higgs bosons, A and H, when they decay to $\\tau^+ \\tau^-$ and $b\\bar{b}$. At the same time, direct searches for dark matter, such as CDMS, attempt to observe neutralino dark matter particles scattering elastically off nuclei. This can occur through t-channel Higgs exchange, which has a large cross section in the case of large $\\tan \\beta$ and small $m_A$. As a result, there is a natural interplay between the heavy, neutral Higgs searches at the Tevatron and the region of parameter space explored by CDMS. We show that if the lightest neutralino makes up the dark matter of our universe, current limits from CDMS strongly constrain the prospects of heavy, neutral MSSM Higgs discovery at the Tevatron (at 3 sigma with 4 fb^-1 per experiment) unless $|\\mu| \\gsim$ 400 GeV. The limits of CDMS projected for 2007 will increase this constraint to $|\\mu| \\gsim$ 800 GeV. On the other hand, if CDMS does observe neutralino dark matter in the near future, it will make the discovery of heavy, neutral MSSM Higgs bosons far more likely at the Tevatron.

Marcela Carena; Dan Hooper; Peter Skands

2006-03-23T23:59:59.000Z

415

A Constraint On Vtd/Vts from B  

E-Print Network (OSTI)

We have searched for the decays, B ! aefl and B ! !fl, which in conjunction with the measurement of B ! K fl, can provide a direct determination of the ratio between the CKM matrix elements, V td and V ts . No signals were observed and we set the following upper limits (90% CL): B(B \\Gamma ! ae \\Gamma fl) ! 2:0 \\Theta 10 \\Gamma5 , B( Ż B 0 ! ae 0 fl) ! 2:4 \\Theta 10 \\Gamma5 , and B( Ż B 0 ! !fl) ! 1:1 \\Theta 10 \\Gamma5 . Using different theoretical models, we also set a range of upper limits on jV td =V ts j ! 0:64 -- 0.76. Permanent address: University of Hawaii at Manoa y Permanent address: INP, Novosibirsk, Russia Last year CLEO reported the first observation of B ! K fl, a flavor-changing neutral current (FCNC) penguin diagram decay [1]. This paper describes a search for three related FCNC penguin decays, B \\Gamma ! ae \\Gamma fl, Ż B 0 ! !fl, and Ż B 0 ! ae 0 fl mediated by the quark level process b ! dfl. The Feynman diagrams associat...

Ae Fl; Ichep Ref; Gls Cleo Conf; G. Masek; J. Gronberg; R. Kutschke; S. Menary

1994-01-01T23:59:59.000Z

416

CONSTRAINTS ON THE ORIGIN OF COSMIC RAYS ABOVE 10{sup 18} eV FROM LARGE-SCALE ANISOTROPY SEARCHES IN DATA OF THE PIERRE AUGER OBSERVATORY  

SciTech Connect

A thorough search for large-scale anisotropies in the distribution of arrival directions of cosmic rays detected above 10{sup 18} eV at the Pierre Auger Observatory is reported. For the first time, these large-scale anisotropy searches are performed as a function of both the right ascension and the declination and expressed in terms of dipole and quadrupole moments. Within the systematic uncertainties, no significant deviation from isotropy is revealed. Upper limits on dipole and quadrupole amplitudes are derived under the hypothesis that any cosmic ray anisotropy is dominated by such moments in this energy range. These upper limits provide constraints on the production of cosmic rays above 10{sup 18} eV, since they allow us to challenge an origin from stationary galactic sources densely distributed in the galactic disk and emitting predominantly light particles in all directions.

Abreu, P.; Andringa, S. [LIP and Instituto Superior Tecnico, Technical University of Lisbon (Portugal); Aglietta, M. [Istituto di Fisica dello Spazio Interplanetario (INAF), Universita di Torino and Sezione INFN, Torino (Italy); Ahlers, M. [University of Wisconsin, Madison, WI (United States); Ahn, E. J. [Fermilab, Batavia, IL (United States); Albuquerque, I. F. M. [Universidade de Sao Paulo, Instituto de Fisica, Sao Paulo, SP (Brazil); Allard, D. [Laboratoire AstroParticule et Cosmologie (APC), Universite Paris 7, CNRS-IN2P3, Paris (France); Allekotte, I. [Centro Atomico Bariloche and Instituto Balseiro (CNEA-UNCuyo-CONICET), San Carlos de Bariloche (Argentina); Allen, J. [New York University, New York, NY (United States); Allison, P. [Ohio State University, Columbus, OH (United States); Almela, A. [Universidad Tecnologica Nacional - Facultad Regional Buenos Aires, Buenos Aires (Argentina); Castillo, J. Alvarez [Universidad Nacional Autonoma de Mexico, Mexico, D.F. (Mexico); Alvarez-Muniz, J. [Universidad de Santiago de Compostela (Spain); Alves Batista, R. [Universidade Estadual de Campinas, IFGW, Campinas, SP (Brazil); Ambrosio, M.; Aramo, C. [Universita di Napoli 'Federico II' and Sezione INFN, Napoli (Italy); Aminaei, A. [IMAPP, Radboud University Nijmegen (Netherlands); Anchordoqui, L. [University of Wisconsin, Milwaukee, WI (United States); Antici'c, T. [Rudjer Boskovi'c Institute, 10000 Zagreb (Croatia); Arganda, E. [IFLP, Universidad Nacional de La Plata and CONICET, La Plata (Argentina); Collaboration: Pierre Auger Collaboration; and others

2013-01-01T23:59:59.000Z

417

Renewable Fuels Limited RFL | Open Energy Information  

Open Energy Info (EERE)

RFL Jump to: navigation, search Name Renewable Fuels Limited (RFL) Place York, United Kingdom Zip YO19 6ET Sector Biomass Product Supplies various biomass fuels and offers...

418

Caldyne Automatics Limited | Open Energy Information  

Open Energy Info (EERE)

Name Caldyne Automatics Limited Place West Bengal, India Zip 700 091 Sector Solar, Wind energy Product Kolkata-based power storage product manufacturer; also makes lighting...

419

ON EFFICIENTLY COMBINING LIMITED MEMORY AND TRUST ...  

E-Print Network (OSTI)

... Euclidean norm with an insignificant computational overhead compared with the cost of computing the quasi-Newton direction in line-search limited memory ...

420

'Dead Time' Limits Quantum Cryptography Speeds  

Science Conference Proceedings (OSTI)

... Not only does dead time limit the transmission rate of a message ... effects and paralyzability in high-speed quantum key distribution, New Journal of ...

2012-06-08T23:59:59.000Z

Note: This page contains sample records for the topic "marketplace constraints limit" 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

Centro Renewables Holding Limited | Open Energy Information  

Open Energy Info (EERE)

developer of wind, solar and water power facilities in China, Taiwan and South Korea. References Centro Renewables Holding Limited1 LinkedIn Connections CrunchBase...

422

Emergency Management Limited Scope Performance Test Inspectors...  

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

Emergency Management Oversight (HS-63) Emergency Management Limited Scope Performance Test Inspectors Guide March 2008 Emergency Management Performance Test Inspectors Guide...

423

Solar constraints on hidden photons re-visited  

E-Print Network (OSTI)

We re-examine solar emission of hidden photons gamma' (mass m) caused by kinetic mixing. We calculate the emission rate with thermal field theory methods and with a kinetic equation that includes "flavor oscillations" and photon absorption and emission by the thermal medium. In the resonant case both methods yield identical emission rates which, in the longitudinal channel, are enhanced by a factor w_P^2/m^2 (plasma frequency w_P) in agreement with An, Pospelov and Pradler (2013). The Sun must not emit more energy in a "dark channel" than allowed by solar neutrino measurements, i.e., not more than 10% of its photon luminosity. Together with the revised emission rate, this conservative requirement implies a bound \\chisolar limit, leaving open the opportunity to detect solar hidden photons with future large-scale dark matter experiments. Detecting low-mass hidden photons with the ALPS-II photon-regeneration experiment also remains possible.

Javier Redondo; Georg Raffelt

2013-05-13T23:59:59.000Z

424

Dark Energy Constraints from the Cosmic Age and Supernova  

E-Print Network (OSTI)

Using the low limit of cosmic ages from globular cluster and the white dwarfs: $t_0 > 12$Gyr, together with recent new high redshift supernova observations from the HST/GOODS program and previous supernova data, we give a considerable estimation of the equation of state for dark energy, with uniform priors as weak as $0.2paper a new scenario of dark energy dubbed Quintom, which gives rise to the equation of state larger than -1 in the past and less than -1 today, satisfying current observations. In addition we've also considered the implications of recent X-ray gas mass fraction data on dark energy, which favors a negative running of the equation of state.

Bo Feng; Xiulian Wang; Xinmin Zhang

2004-04-11T23:59:59.000Z

425

DARK MATTER POWERED STARS: CONSTRAINTS FROM THE EXTRAGALACTIC BACKGROUND LIGHT  

SciTech Connect

The existence of predominantly cold non-baryonic dark matter is unambiguously demonstrated by several observations (e.g., structure formation, big bang nucleosynthesis, gravitational lensing, and rotational curves of spiral galaxies). A candidate well motivated by particle physics is a weakly interacting massive particle (WIMP). Self-annihilating WIMPs would affect the stellar evolution especially in the early universe. Stars powered by self-annihilating WIMP dark matter should possess different properties compared with standard stars. While a direct detection of such dark matter powered stars seems very challenging, their cumulative emission might leave an imprint in the diffuse metagalactic radiation fields, in particular in the mid-infrared part of the electromagnetic spectrum. In this work, the possible contributions of dark matter powered stars (dark stars, DSs) to the extragalactic background light (EBL) are calculated. It is shown that existing data and limits of the EBL intensity can already be used to rule out some DS parameter sets.

Maurer, A.; Raue, M.; Kneiske, T.; Horns, D. [Institut fuer Experimentalphysik, Universitaet Hamburg, Luruper Chaussee 149, D-22761 Hamburg (Germany); Elsaesser, D. [Institut fuer Theoretische Physik und Astrophysik, Am Hubland, D-97074 Wuerzburg (Germany); Hauschildt, P. H., E-mail: andreas.maurer@physik.uni-hamburg.de [Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg (Germany)

2012-02-01T23:59:59.000Z

426

Undergraduate Program Time Limits and Work Schedules  

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

Time Limits and Work Schedules Time Limits and Work Schedules Undergraduate Program Time Limits and Work Schedules Point your career towards LANL: work with the best minds on the planet in an inclusive environment that is rich in intellectual vitality and opportunities for growth. Contact Student Programs (505) 665-8899 Email Time limits The length of participation in the undergraduate program is limited to a maximum of six years for students pursuing a bachelor's degree and three years for students pursuing an associate's degree. Work schedules Year-round students Students participating in some special undergraduate programs, post-baccalaureate appointments, post-master's appointments, and GRA students working on a thesis or dissertation are excluded from the 30-hour per week work restriction.

427

Definition: Stability Limit | Open Energy Information  

Open Energy Info (EERE)

Limit Limit Jump to: navigation, search Dictionary.png Stability Limit The maximum power flow possible through some particular point in the system while maintaining stability in the entire system or the part of the system to which the stability limit refers.[1] Related Terms power, system, stability References ↑ Glossary of Terms Used in Reliability Standards An in LikeLike UnlikeLike You like this.Sign Up to see what your friends like. line Glossary Definition Retrieved from "http://en.openei.org/w/index.php?title=Definition:Stability_Limit&oldid=480505" Categories: Definitions ISGAN Definitions What links here Related changes Special pages Printable version Permanent link Browse properties 429 Throttled (bot load) Error 429 Throttled (bot load) Throttled (bot load)

428

Limited English Proficiency | Department of Energy  

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

Limited English Proficiency Limited English Proficiency Limited English Proficiency On August 11, 2000, President Clinton signed Executive Order 13166, "Improving Access to Services for Persons with Limited English Proficiency." The Executive Order requires federal agencies, including the Department of Energy, to examine the programs and services they provide, to determine whether there is a need for language assistance for persons with Limited English proficiency (LEP) related to their programs and services, and to develop and implement a system to provide language assistance to LEP persons (where necessary) to ensure they have meaningful access to their programs and services. The Executive Order also requires Federal agencies, including the Department of Energy, to provide guidance to recipients of

429

Graduate Program Time Limits and Work Schedules  

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

Time Limits and Work Schedules Time Limits and Work Schedules Graduate Program Time Limits and Work Schedules Point your career towards LANL: work with the best minds on the planet in an inclusive environment that is rich in intellectual vitality and opportunities for growth. Contact Student Programs (505) 665-8899 Email Time Limits The length of participation in the graduate program is limited as follows: With a bachelor's pursuing a master's degree: 4 years With a bachelor's pursuing a PhD: 7 years With a master's pursuing a second master's degree: 2 years With a master's pursuing a PhD: 4 years With a master's pursuing a master's and PhD in a new field: 6 years Students may remain in the GRA program for up to three months after receiving their PhD. Work schedules Year-round students Students participating in the MBA program, post-baccalaureate appointments,

430

4C Offshore Limited | Open Energy Information  

Open Energy Info (EERE)

4C Offshore Limited 4C Offshore Limited Jump to: navigation, search Name 4C Offshore Limited Place Suffolk, United Kingdom Country United Kingdom Product Project planning, consulting for offshore industries (wind, oil, gas) Year founded 2009 Company Type For Profit Company Ownership Private Small Business No Affiliated Companies 4C Offshore Limited Technology Offshore Wind Phone number +44 (0)1502 509260 Website http://www.4coffshore.com/ References 4C Offshore website[1] LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This article is a stub. You can help OpenEI by expanding it. 4C Offshore Limited is a company based in Suffolk, United Kingdom. 4C Offshore is an independent marine consulting firm, that provides advice and consulting services in offshore development, particularly renewables and

431

Combined Tevatron upper limit on gg --> H --> W[superscript +]W[superscript -] and constraints on the Higgs boson mass in fourth-generation fermion models  

E-Print Network (OSTI)

We combine results from searches by the CDF and D0 collaborations for a standard model Higgs boson (H) in the process gg-->H-->W+W- in pp? collisions at the Fermilab Tevatron Collider at [sqrt]s=1.96??TeV. With 4.8??fb-1 ...

Paus, Christoph M. E.

432

CONSTRAINTS ON THE UBIQUITY OF CORONAL X-RAY CYCLES  

SciTech Connect

Stellar activity cycles are known to be a widespread phenomenon amongst moderately active solar- and late-type stars from long-term periodic variations in chromospheric Ca II H and K emission lines, yet to date, only a handful of coronal X-ray cycles are known. We have surveyed serendipitously observed stellar sources in fields observed multiple times in the last decade by XMM-Newton and present our analysis of nine stars from six fields. Since our sample is flux-limited, it is strongly biased toward higher levels of X-ray activity. We fit a single temperature APEC spectrum to each source and search for significant periodicities using a Lomb-Scargle periodogram. We use a Monte Carlo (MC) algorithm to yield robust analysis of the statistical significance of cycle detections and non-detections. None of the nine stellar light curves show any convincing indications of periodicity. From MC simulations, we simulate the detection capabilities of our methodology and, assuming a uniform distribution of cycle periods and strengths over the domain searched, we conclude with 95% confidence that less than 72% of the stars represented by our sample of active stars have 5-13 year coronal X-ray cycles.

Hoffman, John [Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801 (United States); Guenther, Hans M.; Wright, Nicholas J., E-mail: hoffma24@illinois.edu, E-mail: guenther@head.cfa.harvard.edu, E-mail: nwright@cfa.harvard.edu [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

2012-11-10T23:59:59.000Z

433

Limits on Neutrino-Neutrino Scattering in the Early Universe  

E-Print Network (OSTI)

In the standard model neutrinos are assumed to have streamed across the Universe since they last scattered at the weak decoupling epoch when the temperature of the standard-model plasma was ~MeV. The shear stress of free-streaming neutrinos imprints itself gravitationally on the Cosmic Microwave Background (CMB) and makes the CMB a sensitive probe of neutrino scattering. Yet, the presence of nonstandard physics in the neutrino sector may alter this standard chronology and delay neutrino free-streaming until a much later epoch. We use observations of the CMB to constrain the strength of neutrino self-interactions G_eff and put limits on new physics in the neutrino sector from the early Universe. Recent measurements of the CMB at large multipoles made by the Planck satellite and high-l experiments are critical for probing this physics. Within the context of conventional LambdaCDM parameters cosmological data are compatible with G_eff cooled to as low as ~25 eV. Intriguingly, we also find an alternative cosmology compatible with cosmological data in which neutrinos scatter off each other until z~10^4 with a preferred interaction strength in a narrow region around G_eff = 1/(10 MeV)^2. This distinct self-interacting neutrino cosmology is characterized by somewhat lower values of both the scalar spectral index and the amplitude of primordial fluctuations. While we phrase our discussion here in terms of a specific scenario in which a late onset of neutrino free-streaming could occur, our constraints on the neutrino visibility function are very general.

Francis-Yan Cyr-Racine; Kris Sigurdson

2013-06-06T23:59:59.000Z

434

Freshwater Availability and Constraints on Thermoelectric Power Generation in the Southeast U.S.  

SciTech Connect

There is a myriad of uses to which our country's freshwater supply is currently committed. Together with increasing quantities of consumption, there are growing constraints on water availability. In our future there will be two elements of consumption at the forefront of concern: availability and efficiency. Availability of freshwater is the most important of these and is the subject of this report. To use water efficiently, we must first have it. Efficiency is key to ensuring availability for future needs. As population grows and economic and technology demands increase - especially for thermoelectric power - needs for freshwater will also increase. Thus, using our limited supplies of freshwater must be done as efficiently as possible. Thermoelectric generating industry is the largest user of our nation's water resources, including fresh, surface, ground, and saline water. Saline water use accounts for approximately 30% of thermoelectric use, while the remaining 70% is from freshwater sources. The U.S. Geological Survey (USGS) estimates that thermoelectric generation accounts for roughly 136,000 million gallons per day (MGD), or 39% of freshwater withdrawals. This ranks slightly behind agricultural irrigation as the top source of freshwater withdrawals in the U.S. in 2000. For Americans to preserve their standard of living and maintain a thriving economy it is essential that greater attention be paid to freshwater availability in efforts to meet energy demands - particularly for electric power. According to projections by the Energy Information Administration's (EIA) Annual Energy Outlook 2006 (AEO 2006) anticipated growth of thermoelectric generating capacity will be 22% between 2005 and 2030. In the 2007 Report, EIA estimates that capacity to grow from approximately 709 GW in 2005 to 862 GW in 20303. These large increases in generating capacity will result in increased water demands by thermoelectric power plants and greater competition over water between the energy sector and domestic, commercial, agricultural, industrial, and instream use sectors. The implications of these increased demands have not been adequately researched. This report is a preliminary effort to explore these implications. In addition, since this report was completed in draft form in 2007, there have been several updates and important issues brought to bear on water for energy that should be mentioned. Uncertainties include drought and climate change impacts. Policies such as commitments to Coal-to-Liquids (CTL) quotas; Ethanol production requirements; Carbon Capture and Storage (CCS) mandates; increasing nuclear power plant construction; valuing carbon and carbon dioxide emissions all have significant implications on water use and on the need for water in the power sector by 2025.

David Feldman; Amanda Slough; Gary Garrett

2008-06-01T23:59:59.000Z

435

Dose Constraints to Prevent Radiation-Induced Brachial Plexopathy in Patients Treated for Lung Cancer  

Science Conference Proceedings (OSTI)

Purpose: As the recommended radiation dose for non-small-cell lung cancer (NSCLC) increases, meeting dose constraints for critical structures like the brachial plexus becomes increasingly challenging, particularly for tumors in the superior sulcus. In this retrospective analysis, we compared dose-volume histogram information with the incidence of plexopathy to establish the maximum dose tolerated by the brachial plexus. Methods and Materials: We identified 90 patients with NSCLC treated with definitive chemoradiation from March 2007 through September 2010, who had received >55 Gy to the brachial plexus. We used a multiatlas segmentation method combined with deformable image registration to delineate the brachial plexus on the original planning CT scans and scored plexopathy according to Common Terminology Criteria for Adverse Events version 4.03. Results: Median radiation dose to the brachial plexus was 70 Gy (range, 56-87.5 Gy; 1.5-2.5 Gy/fraction). At a median follow-up time of 14.0 months, 14 patients (16%) had brachial plexopathy (8 patients [9%] had Grade 1, and 6 patients [7%] had Grade {>=}2); median time to symptom onset was 6.5 months (range, 1.4-37.4 months). On multivariate analysis, receipt of a median brachial plexus dose of >69 Gy (odds ratio [OR] 10.091; 95% confidence interval [CI], 1.512-67.331; p = 0.005), a maximum dose of >75 Gy to 2 cm{sup 3} of the brachial plexus (OR, 4.909; 95% CI, 0.966-24.952; p = 0.038), and the presence of plexopathy before irradiation (OR, 4.722; 95% CI, 1.267-17.606; p = 0.021) were independent predictors of brachial plexopathy. Conclusions: For lung cancers near the apical region, brachial plexopathy is a major concern for high-dose radiation therapy. We developed a computer-assisted image segmentation method that allows us to rapidly and consistently contour the brachial plexus and establish the dose limits to minimize the risk of brachial plexopathy. Our results could be used as a guideline in future prospective trials with high-dose radiation therapy for unresectable lung cancer.

Amini, Arya [Department of Radiation Oncology, University of Texas M. D. Anderson Cancer Center, Houston, Texas (United States); University of California Irvine School of Medicine, Irvine, California (United States); Yang Jinzhong; Williamson, Ryan [Department of Radiation Physics, University of Texas M. D. Anderson Cancer Center, Houston, Texas (United States); McBurney, Michelle L. [Department of Radiation Oncology, University of Texas M. D. Anderson Cancer Center, Houston, Texas (United States); Erasmus, Jeremy [Department of Diagnostic Imaging, University of Texas M. D. Anderson Cancer Center, Houston, Texas (United States); Allen, Pamela K.; Karhade, Mandar; Komaki, Ritsuko; Liao, Zhongxing; Gomez, Daniel; Cox, James [Department of Radiation Oncology, University of Texas M. D. Anderson Cancer Center, Houston, Texas (United States); Dong, Lei [Department of Radiation Physics, University of Texas M. D. Anderson Cancer Center, Houston, Texas (United States); Welsh, James, E-mail: jwelsh@mdanderson.org [Department of Radiation Oncology, University of Texas M. D. Anderson Cancer Center, Houston, Texas (United States)

2012-03-01T23:59:59.000Z

436

Constraints On The Mechanism Of Long-Term, Steady Subsidence At Medicine  

Open Energy Info (EERE)

Constraints On The Mechanism Of Long-Term, Steady Subsidence At Medicine Constraints On The Mechanism Of Long-Term, Steady Subsidence At Medicine Lake Volcano, Northern California, From Gps, Leveling, And Insar Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Journal Article: Constraints On The Mechanism Of Long-Term, Steady Subsidence At Medicine Lake Volcano, Northern California, From Gps, Leveling, And Insar Details Activities (2) Areas (1) Regions (0) Abstract: Leveling surveys across Medicine Lake volcano (MLV) have documented subsidence that is centered on the summit caldera and decays symmetrically on the flanks of the edifice. Possible mechanisms for this deformation include fluid withdrawal from a subsurface reservoir, cooling/crystallization of subsurface magma, loading by the volcano and dense intrusions, and crustal thinning due to tectonic extension (Dzurisin

437

Secure Communication over Fading Channels with Statistical QoS Constraints  

E-Print Network (OSTI)

In this paper, the secure transmission of information over an ergodic fading channel is investigated in the presence of statistical quality of service (QoS) constraints. We employ effective capacity, which provides the maximum constant arrival rate that a given process can support while satisfying statistical delay constraints, to measure the secure throughput of the system, i.e., effective secure throughput. We assume that the channel side information (CSI) of the main channel is available at the transmitter side. Depending on the availability of the CSI of the eavesdropper channel, we obtain the corresponding optimal power control policies that maximize the effective secure throughput. In particular, when the CSI of the eavesdropper channel is available at the transmitter, the transmitter can no longer wait for transmission when the main channel is much better than the eavesdropper channel due to the introduction of QoS constraints. Moreover, the CSI of the eavesdropper channel becomes useless as QoS constr...

Qiao, Deli; Velipasalar, Senem

2010-01-01T23:59:59.000Z

438

Interpretation of warm prestress-induced fracture toughness based on crack-tip constraint  

SciTech Connect

This study explores the possibility of using J-Q-related crack-tip constraint concepts to provide a basis for both the interpretation of warm prestress (WPS)-induced fracture toughness and their transferability to structural applications. A finite-element boundary-layer formulation based on small-scale yielding (SSY), remote mode I K-dominant assumptions is adopted. Effects of WPS-induced crack-tip constraint are quantified in terms of deviation in either the opening-mode or the mean stress component of the WPS crack-tip fields relative to the reference K-dominant SSY state associated with monotonic-loading conditions. Over the range of WPS load-paths considered the WPS-induced crack-tip constraint closely resembles a spatially varying hydrostatic stress field. Interpretation and transferability of WPS fracture toughness under SSY conditions are specified in terms of the unload and reload ratio.

Shum, D.K.M.

1993-06-01T23:59:59.000Z

439

New constraints in absorptive capacity and the optimum rate of petroleum output  

SciTech Connect

Economic policy in four oil-producing countries is analyzed within a framework that combines a qualitative assessment of the policy-making process with an empirical formulation based on historical and current trends in these countries. The concept of absorptive capacity is used to analyze the optimum rates of petroleum production in Iran, Iraq, Saudi Arabia, and Kuwait. A control solution with an econometric model is developed which is then modified for alternative development strategies based on analysis of factors influencing production decisions. The study shows the consistencies and inconsistencies between the goals of economic growth, oil production, and exports, and the constraints on economic development. Simulation experiments incorporated a number of the constraints on absorptive capacity. Impact of other constraints such as income distribution and political stability is considered qualitatively. (DLC)

El Mallakh, R

1980-01-01T23:59:59.000Z

440

AWGN Channel under Time-Varying Amplitude Constraints with Causal Information at the Transmitter  

E-Print Network (OSTI)

We consider the classical AWGN channel where the channel input is constrained to an amplitude constraint that stochastically varies at each channel use, independent of the message. This is an abstraction of an energy harvesting transmitter where the code symbol energy at each channel use is determined by an exogenous energy arrival process and there is no battery for energy storage. At each channel use, an independent realization of the amplitude constraint process is observed by the transmitter causally. This scenario is a state-dependent channel with perfect causal state information at the transmitter. We derive the capacity of this channel using Shannon's coding scheme with causal state information. We prove that the code symbols must be selected from a finite set in the capacity achieving scheme, as in the case of Smith. We numerically study the binary on-off energy arrivals where the amplitude constraint is either zero or a non-zero constant.

Ozel, Omur

2011-01-01T23:59:59.000Z

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


441

A higher limit approach to homology theories.  

E-Print Network (OSTI)

A lot of well-known functors such as group homology, cyclic homology of algebras can be described as limits of certain simply defined functors over categories of presentations. In this paper, we develop technique for the description of the higher limits over categories of presentations and show that certain homological functors can be described in this way. In particular, we give a description of Hochschild homology and the derived functors of tensor, symmetric and exterior powers in the sense of Dold and Puppe as higher limits.

Sergei O. Ivanov; Roman Mikhailov

442

Hydraulic constraints on photosynthesis in subtropical evergreen broad leaf forest and pine woodland trees of the Florida Everglades  

E-Print Network (OSTI)

PAPER Hydraulic constraints on photosynthesis in subtropicalwater transport and photosynthesis represents the trade-offwater transport and photosynthesis to evaluate hydraulic

Jones, Tim J.; Luton, Corene D.; Santiago, Louis S.; Goldstein, Guillermo

2010-01-01T23:59:59.000Z

443

Dose Modeling Evaluations and Technical Support Document For the Authorized Limits Request for the DOE-Owned Property Outside the Limited Area, Paducah Gaseous Diffusion Plant Paducah, Kentucky  

SciTech Connect

Environmental assessments and remediation activities are being conducted by the U.S. Department of Energy (DOE) at the Paducah Gaseous Diffusion Plant (PGDP), Paducah, Kentucky. The Oak Ridge Institute for Science and Education (ORISE), a DOE prime contractor, was contracted by the DOE Portsmouth/Paducah Project Office (DOE-PPPO) to conduct radiation dose modeling analyses and derive single radionuclide soil guidelines (soil guidelines) in support of the derivation of Authorized Limits (ALs) for 'DOE-Owned Property Outside the Limited Area' ('Property') at the PGDP. The ORISE evaluation specifically included the area identified by DOE restricted area postings (public use access restrictions) and areas licensed by DOE to the West Kentucky Wildlife Management Area (WKWMA). The licensed areas are available without restriction to the general public for a variety of (primarily) recreational uses. Relevant receptors impacting current and reasonably anticipated future use activities were evaluated. In support of soil guideline derivation, a Conceptual Site Model (CSM) was developed. The CSM listed radiation and contamination sources, release mechanisms, transport media, representative exposure pathways from residual radioactivity, and a total of three receptors (under present and future use scenarios). Plausible receptors included a Resident Farmer, Recreational User, and Wildlife Worker. single radionuclide soil guidelines (outputs specified by the software modeling code) were generated for three receptors and thirteen targeted radionuclides. These soil guidelines were based on satisfying the project dose constraints. For comparison, soil guidelines applicable to the basic radiation public dose limit of 100 mrem/yr were generated. Single radionuclide soil guidelines from the most limiting (restrictive) receptor based on a target dose constraint of 25 mrem/yr were then rounded and identified as the derived soil guidelines. An additional evaluation using the derived soil guidelines as inputs into the code was also performed to determine the maximum (peak) dose for all receptors. This report contains the technical basis in support of the DOE?s derivation of ALs for the 'Property.' A complete description of the methodology, including an assessment of the input parameters, model inputs, and results is provided in this report. This report also provides initial recommendations on applying the derived soil guidelines.

Boerner, A. J. [Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States). Independent Environmental Assessment and Verification Program; Maldonado, D. G. [Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN (United States). Independent Environmental Assessment and Verification Program; Hansen, Tom [Ameriphysics, LLC (United States)

2012-09-01T23:59:59.000Z

444

Duality, thermodynamics, and the linear programming problem in constraint-based models of metabolism  

E-Print Network (OSTI)

It is shown that the dual to the linear programming problem that arises in constraint-based models of metabolism can be given a thermodynamic interpretation in which the shadow prices are chemical potential analogues, and the objective is to minimise free energy consumption given a free energy drain corresponding to growth. The interpretation is distinct from conventional non-equilibrium thermodynamics, although it does satisfy a minimum entropy production principle. It can be used to motivate extensions of constraint-based modelling, for example to microbial ecosystems.

Patrick B. Warren; Janette L. Jones

2007-02-09T23:59:59.000Z

445

Constraints on Hidden Photon Models from Electron g-2 and Hydrogen Spectroscopy  

E-Print Network (OSTI)

The hidden photon model is one of the simplest models which can explain the anomaly of the muon anomalous magnetic moment (g-2). The experimental constraints are studied in detail, which come from the electron g-2 and the hydrogen transition frequencies. The input parameters are set carefully in order to take dark photon contributions into account and to prevent the analysis from being self-inconsistent. It is shown that the new analysis provides a constraint severer by more than one order of magnitude than the previous result.

Endo, Motoi; Mishima, Go

2012-01-01T23:59:59.000Z

446

The Batalin-Vilkovisky Field-Antifield Action for Systems with First-Class Constraints  

E-Print Network (OSTI)

The Batalin-Vilkovisky field-antifield action for systems with first-class constraints is given explicitly in terms of the canonical hamiltonian, the hamiltonian constraints and the first-order hamiltonian gauge structure functions. It is shown that this action does not depend on the hamiltonian gauge structure functions of higher orders. A method for finding the lagrangian gauge structure tensors of all orders is presented. It is proven that the lagrangian gauge structure tensors do not depend on the hamiltonian gauge structure functions of second- or higher-orders.

Louis-Martinez, Domingo J

2011-01-01T23:59:59.000Z

447

The Batalin-Vilkovisky Field-Antifield Action for Systems with First-Class Constraints  

E-Print Network (OSTI)

The Batalin-Vilkovisky field-antifield action for systems with first-class constraints is given explicitly in terms of the canonical hamiltonian, the hamiltonian constraints and the first-order hamiltonian gauge structure functions. It is shown that this action does not depend on the hamiltonian gauge structure functions of higher orders. A method for finding the lagrangian gauge structure tensors of all orders is presented. It is proven that the lagrangian gauge structure tensors do not depend on the hamiltonian gauge structure functions of second- or higher-orders.

Domingo J. Louis-Martinez

2011-04-17T23:59:59.000Z

448

Carnegie Wave Energy Limited | Open Energy Information  

Open Energy Info (EERE)

Carnegie Wave Energy Limited Carnegie Wave Energy Limited Jump to: navigation, search Name Carnegie Wave Energy Limited Address 1 124 Stirling Highway Place North Fremantle Zip 6159 Sector Marine and Hydrokinetic Year founded 1993 Number of employees 25 Website http://www.carnegiewave.com Region Australia LinkedIn Connections CrunchBase Profile No CrunchBase profile. Create one now! This company is listed in the Marine and Hydrokinetic Technology Database. This company is involved in the following MHK Projects: CETO La Reunion CETO3 Garden Island Perth Wave Energy Project PWEP This company is involved in the following MHK Technologies: CETO Wave Energy Technology This article is a stub. You can help OpenEI by expanding it. Retrieved from "http://en.openei.org/w/index.php?title=Carnegie_Wave_Energy_Limited&oldid=678263

449

Infinite volume limit for the dipole gas  

E-Print Network (OSTI)

We consider a classical dipole gas in with low activity and show that the pressure has a limit as the volume goes to infinity. The result is obtained by a renormalization group analysis of the model.

J. Dimock

2008-12-09T23:59:59.000Z

450

Beam limiter for thermonuclear fusion devices  

DOE Patents (OSTI)

A beam limiter circumscribes the interior surface of a vacuum vessel to inhibit collisions of contained plasma and the vessel walls. The cross section of the material making up the limiter has a flatsided or slightly concave portion of increased width towards the plasma and portions of decreased width towards the interior surface of the vessel. This configuration is designed to prevent a major fraction of the material sputtered, vaporized and blistered from the limiter from reaching the plasma. It also allows adequate heat transfer from the wider to the narrower portions. The preferred materials for the beam limiter are solids of sintered, particulate materials of low atomic number with low vapor pressure and low sputtering and blistering yields.

Kaminsky, Manfred S. (Hinsdale, IL)

1976-01-01T23:59:59.000Z

451

Studies on the dynamics of limited filaments  

E-Print Network (OSTI)

A study on the dynamics of filaments in the presence of a diagnostic, conductive limiter is presented. Plasma filaments are coherent structures present in many fusion devices and transport a significant amount of particles ...

Bonde, Jeffrey David

2010-01-01T23:59:59.000Z

452

Fuzzy Limits and Fuzzy Nearness Relation  

Science Conference Proceedings (OSTI)

The aim of this paper is to introduce the notion of fuzzy limit within the fuzzy analysis developed in the concept of fuzzy nearness relation. The main results concern the corresponding calculus.

Martin Kalina

2001-10-01T23:59:59.000Z

453

Performance limits of axial turbomachine stages  

E-Print Network (OSTI)

This thesis assesses the limits of stage efficiency for axial compressor and turbine stages. A stage model is developed, consisting of a specified geometry and a surface velocity distribution with turbulent boundary layers. ...

Hall, David Kenneth

2011-01-01T23:59:59.000Z

454

Spectra Computed from a Limited Area Grid  

Science Conference Proceedings (OSTI)

A method is presented for determining variance spectra of meteorological fields specified on limited-area grids. Spectra so obtained are compared with global spectra of the same data. An example of scale decomposition (i.e., filtering) using this ...

Ronald M. Errico

1985-09-01T23:59:59.000Z

455

EU Energy Wind Limited | Open Energy Information  

Open Energy Info (EERE)

company will be concentrating initially on bringing an innovative composite wind tower to market. References EU Energy (Wind) Limited1 LinkedIn Connections CrunchBase Profile No...

456

Limit order markets, liquidity, and price impact  

E-Print Network (OSTI)

In this thesis, I explore various aspects of market liquidity and analyze its effect on asset prices. First, in a model of a limit order market I explain how to define liquidity and derive a price impact function. Second, ...

Rosu, Ioanid, 1970-

2004-01-01T23:59:59.000Z

457

Definition: Interconnection Reliability Operating Limit | Open...  

Open Energy Info (EERE)

Terms System Operating Limit, System, Cascading Outage, smart grid References Glossary of Terms Used in Reliability Standards An inl LikeLike UnlikeLike You like this.Sign...

458

Snowfall Limit Forecasts and Hydrological Modeling  

Science Conference Proceedings (OSTI)

Hydrological flood forecasting in mountainous areas requires accurate partitioning between rain and snowfall to properly estimate the extent of runoff contributing areas. Here a method to make use of snowfall limit information—a standard output of ...

Cara Tobin; Andrea Rinaldo; Bettina Schaefli

2012-10-01T23:59:59.000Z

459

String Scattering Amplitudes in High Energy Limits  

E-Print Network (OSTI)

A very review of string scattering amplitudes in two important high energy limits: hard scattering and Regge scattering. Recent results of the symmetries in string theory by studying high energy string scattering anplitudes are showed.

Yang, Yi

2011-01-01T23:59:59.000Z

460

Residential and Commercial Briefings 2000: Characteristics of the Retail Marketplace  

Science Conference Proceedings (OSTI)

This industry report examines changes in the competitive electricity market throughout the year 2000, and how these changes affect residential and commercial customers. The following issues are discussed: o Characteristics of the residential and commercial markets: current and future energy use data by market and fuel type o Industry restructuring, deregulation, and its energy suppliers: deregulation issues by state and energy supplier activity within those states o Corporate moves, mergers, and business...

2002-02-07T23:59:59.000Z

Note: This page contains sample records for the topic "marketplace constraints limit" 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

Obstacles and Opportunity: Overcoming Barriers in Today's CHP Marketplace  

E-Print Network (OSTI)

Combined heat and power (CHP), which can offer tremendous efficiency benefits to industrial facilities around the country, continues to be viewed as a long-term efficiency opportunity. However, the high up-front cost of CHP equipment and fuel-dependent operating costs have made CHP a difficult sell internally in some corporations. The recent recession and slow recovery have further discouraged facility managers and owners from making large capital investments such as CHP. This paper addresses the biggest barriers to new CHP project development from the perspective of those intimately involved in moving new CHP projects forward: CHP developers and CHP advocates. It identifies economic and financial barriers as the largest common barriers found throughout the U.S. It also suggests ways that CHP developers and advocates can address these barriers, and attempts to overcome them in the current economic context.

Chittum, A.; Kaufman, N.

2011-01-01T23:59:59.000Z

462

Workshop on Improving Trust in the Online Marketplace  

Science Conference Proceedings (OSTI)

... The event will be webcast live April 10-11 ... will be invited to present their work during the ... nist.gov, indicating in the subject line: "Workshop Abstract ...

2013-08-01T23:59:59.000Z

463

Steam Power Partnership: Improving Steam System Efficiency Through Marketplace Partnerships  

E-Print Network (OSTI)

The Alliance to Save Energy, a national nonprofit organization based in Washington DC, and the U.S. Department of Energy are working with energy efficiency suppliers to promote the comprehensive upgrade of industrial steam systems. Like EPA's Green Lights and DOE's Motor Challenge, the Steam Power Partnership program will encourage industrial energy consumers to retrofit their steam plants wherever profitable. The Alliance has organized a "Steam Team" of trade associations, consulting engineering firms, and energy efficiency companies to help develop this public- private initiative.

Jones, T.

1997-04-01T23:59:59.000Z

464

Efficient Lighting : Technologies : From the Lab to the Marketplace...  

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

2005 would provide 15 billion in energy savings. Appliance efficiency standards have led to the widespread adoption of electronic ballasts. For a more recent estimate of...

465

Bioethanol--Moving into the Marketplace: Advanced Biotechnology Becoming Reality  

SciTech Connect

A fact sheet about the technology used for producing transportation fuel from biomass and the Department of Energy's efforts to commercialize that technology.

Brown, H.

2001-08-02T23:59:59.000Z

466

Participatory aid marketplace : designing online channels for digital humanitarians  

E-Print Network (OSTI)

Recent years have seen an increase in natural and man-made crises. Information and communication technologies are enabling citizens to contribute creative solutions and participate in crisis response in myriad new ways, ...

Stempeck, Matt (Matt Kelly)

2013-01-01T23:59:59.000Z

467

Aerosol Duct Sealing : Technologies : From the Lab to the Marketplace...  

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

the California building code changes and increasing availability of the aerosol sealing technology, more homeowners and facilities managers will seal their duct systems and save...

468

Industrial Powerhouse Optimization in the Deregulated Electricity Marketplace  

E-Print Network (OSTI)

The State of Delaware deregulated the retail sale of electricity in 2002, enabling buyers to procure power on a real-time price schedule and sell excess generated power to the grid. This initiative has prompted industrial sites, especially those with on-site generation capability, to evaluate the benefits and risks of the deregulated market. Deregulation can offer significant potential savings to industrial customers. However, with this opportunity comes exposure to turbulent fluctuations in electricity prices, which can sometimes reach $1,000/MW-hr. If a customer is unprepared for high electricity prices, an entire year of electricity cost savings can quickly be erased. This paper describes how one industrial site evaluated the risks and benefits of electricity deregulation and implemented real-time optimization of the electricity make-buy decision.

Hughes, P. D.; Bailey, W. F.

2003-05-01T23:59:59.000Z

469

Workshop on Improving Trust in the Online Marketplace ...  

Science Conference Proceedings (OSTI)

... Andrews, Rick - CAs Alone Do Not Provide Trust. Bender, Jens; Schönherr, Kerstin - Enhancing Trust by Enhancing the Audit Process. ...

2013-08-01T23:59:59.000Z

470

Workshop on Improving Trust in the Online Marketplace ...  

Science Conference Proceedings (OSTI)

... Revocation Process Ryan Koski, GoDaddy. Certificate Transparency protocol design and implementation Emilia Kasper, Google. ...

2013-08-01T23:59:59.000Z

471

Argonne in the marketplace: Microchannel plates with ALD | Argonne...  

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

based on atomic layer deposition techniques are available for licensing from Argonne. If you're interested in licensing, please contact partners@anl.gov or visit...

472

Energy management in cleanrooms: From the lab to the marketplace  

E-Print Network (OSTI)

Plen. Figure 2. Unintended cooling tower cycling. Figure 3.issues such as unintended cooling tower cycling [Figure 2],

Mills, Evan

2004-01-01T23:59:59.000Z

473

Bioethanol--Moving into the Marketplace: Advanced Biotechnology Becoming Reality  

SciTech Connect

A fact sheet about the technology used for producing transportation fuel from biomass and the Department of Energy's efforts to commercialize that technology.

Brown, H.

2001-08-02T23:59:59.000Z

474

Public problems: Still waiting on the marketplace for solutions  

Science Conference Proceedings (OSTI)

This report addresses the need for government sponsored R and D to address real public problems. The motivation is that a public benefit of the money spent must be demonstrated. The areas identified as not having appropriate attention resulting in unmet public needs include healthcare cost, cost and benefits of regulations, infrastructure problems, defense spending misaligned with foreign policy objectives, the crime problem, energy impact on the environment, the education problem, low productivity growth industry sectors, the income distribution problem, the aging problem, the propagation of disease and policy changes needed to address the solution of these problems.

Gover, J. [Sandia National Labs., Albuquerque, NM (United States)] [Sandia National Labs., Albuquerque, NM (United States); Carayannis, E. [George Washington Univ., Washington, DC (United States)] [George Washington Univ., Washington, DC (United States); Huray, P.

1997-10-01T23:59:59.000Z

475

New Online Marketplace for Small Business Contracting Launched...  

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

contracting process, making it simpler for small businesses to find and bid on low-dollar contracts from federal agencies. The new program allows the government to source...

476

Pressure limits of an axisymmetric torus  

SciTech Connect

In order to clarify the pressure limit of a toroidal plasma equilibrium in a three-dimensional geometry, an azimuthally symmetric toroidal plasma was considered. In a tokamak-like plasma, the net toroidal current is necessary for a finite ..beta.. plasma equilibrium. If external conductors are used to provide the rotational transform, iota, the plasma pressure is limited to ..beta.. = (iota/2..pi..)/sup 2//2A, where A is the aspect ratio.

Yoshikawa, S.

1986-03-01T23:59:59.000Z

477

Future World Energy Constraints and the Direction for Solutions  

SciTech Connect

This paper was originally written in response to the concern that rising levels of CO2 in the atmosphere caused by burning of fossil fuels will ultimately contribute to global warming. Now we are beginning to see evidence of coming problems in the supply of fuels for transportation. This paper describes the benefits of adequate energy supply and the problems of future energy supply. Partial solutions are suggested for immediate application as well as longer term solutions to address both of these concerns. To evaluate the situation and solutions we must understand: (1) how much primary energy is currently used world-wide and might be needed in 2100, (2) how important energy is to the welfare of people, (3) the forms of energy sources and end uses and (4) where new sources may come from. The major portion of world primary energy demand is provided by fossil fuels. This portion dropped from 93% in 1970 to 85% in 1995, mainly because of the increased use of nuclear energy. How ever, since the mid-1990s fossil fuels have maintained their 85% share of world energy supply. The importance of the relationship between per capita energy consumption and per capita income for the world is discussed. The limits of conservation, energy efficiency and renewable energies are examined. The contribution of renewable energies is compared to 41 different views of world energy demand in 2100. Without new technology for large scale storage of intermittent electricity from wind and solar the contribution of renewable energies is not likely to grow significantly beyond the current level of 7-8%. The paper offers conclusions and partial solutions that we can work on immediately. Examination of the forms of energy supplied by the sun, which is powered by nuclear fusion, and the way in which nuclear fission currently supplies energy to the world sets the research framework for longer term solutions. This framework points towards two possible longer term complementary res earch projects which take advantage of the concentrated energy and portability of nuclear fission: (1) to find ways of extending nuclear fission to smaller transportation and heating applications and (2) to develop nuclear fusion for manufacturing fissionable materials.

Lightfoot, H.D.

2004-09-12T23:59:59.000Z

478

On the Effectiveness of Rate Limiting Mechanisms  

E-Print Network (OSTI)

One class of worm defense techniques that received attention of late is to “rate limit ” outbound traffic to contain fast spreading worms. Several proposals of rate limiting techniques have appeared in the literature, each with a different take on the impetus behind rate limiting. This paper presents an empirical analysis on different rate limiting schemes using real traffic and attack traces from a sizable network. In the analysis we isolate and investigate the impact of the critical parameters for each scheme and seek to understand how these parameters might be set in realistic network settings. Analysis shows that using DNS-based rate limiting has substantially lower error rates than schemes based on other traffic statistics. The empirical analysis additionally brings to light a number of issues with respect to rate limiting in practice. We explore the impact of these issues in the context of general worm containment. Acknowledgments: We thank the members and companies of the PDL Consortium for their support. This work was partially supported by the National Science Foundation under Grant No. CNS-0433540 and ANI-0326472.

Cynthia Wong; Stan Bielski; Ahren Studer; Chenxi Wang

2005-01-01T23:59:59.000Z

479

State emissions limitations for boilers: particulate matter  

SciTech Connect

This document summarizes regulations applicable to boilers as reflected in current state and local air regulations. Not all of these regulations are officially part of Federally-approved State Implementation Plans (SIPs). Several regulations have only recently been adopted by the State and are now undergoing EPA review for incorporation into the SIP. Each summary also contains local regulations more stringent than the State rules. Most local regulations in this handbook are included in the State Implementation Plan. Site-specific emission limits (variances from State limits or limits more stringent than State limits) are not included in these summaries. Appendix A contains maps showing the location of Air Quality Control Regions or other districts by which several States regulate emissions. Appendix B contains a summary of National Ambient Air Quality Standards, which States are required to meet as a minimum. Appendix C contains a description and summary of Federal New Source Performance Standards. Appendix D contains formulas for conversion of emmissions limits expressed in one set of units to the most common units - No. PM/MMBtu. Appendix E contains Figure 2 of ASME APS-1, used for determining particulate emissions limits in some States.

Not Available

1980-01-01T23:59:59.000Z

480

Political Constraints on Government Cartelization: The Case of Oil Production Regulation in Texas and Saudi Arabia by  

E-Print Network (OSTI)

We examine government cartelization efforts in crude oil production. Texas and Saudi Arabia are alleged to act as swing producers to maintain the interstate (1933-1972) and OPEC (1973 on) oil cartels respectively. We analyze the political constraints that affected the ability of Texas and Saudi Arabia to act as residual producers within their respective cartels. In the case of Texas, political factors molded individual firm production quotas, advantaging high-cost producers and hence, reducing total cartel net profits. Further, Texas had limited range for adjusting total state production to maintain interstate output at levels consistent with target prices. Saudi Arabia’s role as swing producer within OPEC raises similar questions regarding how cartel output is shared among members, and the extent to which domestic economic and political pressures coming from various member countries may undermine the effectiveness of the cartel. OPEC ‘s coordination problem has been more difficult than that faced by the interstate cartel for a variety of reasons that we explore. Even so, they have not kept the OPEC members in general, and Saudi Arabia in particular, from exerting a strong influence on the level of world oil prices.

Gary D. Libecap; James L. Smith

2001-01-01T23:59:59.000Z

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


481

Dark Matter Constraints from Observations of 25 Milky Way Satellite Galaxies with the Fermi Large Area Telescope  

E-Print Network (OSTI)

The dwarf spheroidal satellite galaxies of the Milky Way are some of the most dark-matter-dominated objects known. Due to their proximity, high dark matter content, and lack of astrophysical backgrounds, dwarf spheroidal galaxies are widely considered to be among the most promising targets for the indirect detection of dark matter via gamma rays. Here we report on gamma-ray observations of 25 Milky Way dwarf spheroidal satellite galaxies based on 4 years of Fermi Large Area Telescope (LAT) data. None of the dwarf galaxies are significantly detected in gamma rays, and we present gamma-ray flux upper limits between 500 MeV and 500 GeV. We determine the dark matter content of 18 dwarf spheroidal galaxies from stellar kinematic data and combine LAT observations of 15 dwarf galaxies to constrain the dark matter annihilation cross section. We set some of the tightest constraints to date on the the annihilation of dark matter particles with masses between 2 GeV and 10 TeV into prototypical Standard Model channels. We find these results to be robust against systematic uncertainties in the LAT instrument performance, diffuse gamma-ray background modeling, and assumed dark matter density profile.

The Fermi-LAT Collaboration; :; M. Ackermann; A. Albert; B. Anderson; L. Baldini; J. Ballet; G. Barbiellini; D. Bastieri; K. Bechtol; R. Bellazzini; E. Bissaldi; E. D. Bloom; E. Bonamente; A. Bouvier; T. J. Brandt; J. Bregeon; M. Brigida; P. Bruel; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; M. Caragiulo; P. A. Caraveo; C. Cecchi; E. Charles; A. Chekhtman; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; J. Conrad; F. D'Ammando; A. de Angelis; C. D. Dermer; S. W. Digel; E. do Couto e Silva; P. S. Drell; A. Drlica-Wagner; R. Essig; C. Favuzzi; E. C. Ferrara; A. Franckowiak; Y. Fukazawa; S. Funk; P. Fusco; F. Gargano; D. Gasparrini; N. Giglietto; M. Giroletti; G. Godfrey; G. A. Gomez-Vargas; I. A. Grenier; Guiriec; M. Gustafsson; M. Hayashida; E. Hays; J. Hewitt; R. E. Hughes; T. Jogler; T. Kamae; J. Knödlseder; D. Kocevski; M. Kuss; . Larsson; L. Latronico; M. Llena Garde; F. Longo; F. Loparco; M. N. Lovellette; P. Lubrano; G. Martinez; M. Mayer; M. N. Mazziotta; P. F. Michelson; W. Mitthumsiri; T. Mizuno; A. A. Moiseev; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; R. Nemmen; E. Nuss; T. Ohsugi; E. Orlando; J. F. Ormes; J. S. Perkins; F. Piron; G. Pivato; T. A. Porter; S. Rainň; R. Rando; M. Razzano; S. Razzaque; A. Reimer; O. Reimer; S. Ritz; M. Sŕnchez-Conde; N. Sehgal; C. Sgrň; E. J. Siskind; P. Spinelli; L. Strigari; D. J. Suson; H. Tajima; H. Takahashi; J. B. Thayer; L. Tibaldo; M. Tinivella; D. F. Torres; Y. Uchiyama; T. L. Usher; J. Vandenbroucke; G. Vianello; V. Vitale; M. Werner; B. L. Winer; K. S. Wood; M. Wood; G. Zaharijas; S. Zimmer

2013-10-02T23:59:59.000Z

482

HQFMSP Chapter 2, Limited Areas, Valut-Type Rooms and Temporary Limited  

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

2, Limited Areas, Valut-Type Rooms and Temporary 2, Limited Areas, Valut-Type Rooms and Temporary Limited Areas HQFMSP Chapter 2, Limited Areas, Valut-Type Rooms and Temporary Limited Areas October 2013 2013 Headquarters Facilities Master Security Plan - Chapter 2, Limited Areas, Valut-Type Rooms and Temporary Limited Areas This chapter covers the establishment, maintenance, and termination of areas within HQ buildings where classified activities take place. It covers the requirements applicable to each type of security area, including physical protection measures, controls on the use of electronic devices, restrictions on what security activities can take place, and what security equipment must be present. The procedures in this chapter were developed and are maintained jointly by HS-91 and the Office of Information Security

483

Geochemical constraints on the Palaeocene^ Miocene evolution of eastern Azerbaijan, with  

E-Print Network (OSTI)

Geochemical constraints on the Palaeocene^ Miocene evolution of eastern AzerbaijanEarth and Environmental Sciences, University of Texas at Arlington, Arlington,TX, USA zAzerbaijan NationalAcademy of Sciences Geology Institute ^ 29 A. H. Javid Pr., Baku, Azerbaijan ABSTRACT Fine-grained Palaeogene

Johnson, Cari

484

Simple Adjoint Methods for Single-Doppler Wind Analysis with a Strong Constraint of Mass Conservation  

Science Conference Proceedings (OSTI)

Three schemes are developed to incorporate a strong constraint of (incompressible) mass conservation into the basic scheme (scheme B) of the simple adjoint method of Qiu and Xu for retrieving the time-mean wind field from a sequence of single-...

Qin Xu; Chong-Jian Qiu

1994-04-01T23:59:59.000Z

485

Adaptation of P.D. Thompson's Scheme to the Constraint of Potential vorticity Conservation  

Science Conference Proceedings (OSTI)

The dynamical adjustment scheme of P.D. Thompson (1969) has been adapted to the two-parameter baroclinic model which has potential vorticity as the constraint. In contrast to Thompson's approach, which used a differential-difference form of the ...

John M. Lewis

1982-11-01T23:59:59.000Z

486

Determination of fault operation dynamical constraints for the design of wind turbine DFIG drives  

Science Conference Proceedings (OSTI)

This paper presents an efficient design tool for the estimation of the transient electromagnetic peak torque and transient rotor over-voltages of wind turbines (WT) doubly-fed induction generators (DFIG) during severe fault conditions on the grid side. ... Keywords: Dynamical constraint, Integrated design, Non-linear optimization, Wind turbine

Davide Aguglia; Philippe Viarouge; René Wamkeue; Jérôme Cros

2010-10-01T23:59:59.000Z

487

Low-power repeater insertion with both delay and slew rate constraints  

Science Conference Proceedings (OSTI)

In this paper, a novel repeater insertion algorithm is presented to minimize the power dissipation of interconnect trees under given timing budgets and slew rate constraints. In contrast to traditional bottom-up dynamic programming approaches, the proposed ... Keywords: interconnect, low power, repeater insertion, slew rate

Yuantao Peng; Xun Liu

2006-07-01T23:59:59.000Z

488

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

E-Print Network (OSTI)

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

Li, Xiaodong

489

Comparing the usability of grid-bag and constraint-based layouts  

Science Conference Proceedings (OSTI)

While the usability of GUI design methods has been studied in general, the usability of layout specification methods is largely unexplored. In this paper we provide an empirical comparison of two popular GUI layout models, grid-bag layout and constraint-based ... Keywords: API, empiric evaluation, layout, usability

Clemens Zeidler; Johannes Müller; Christof Lutteroth; Gerald Weber

2012-11-01T23:59:59.000Z

490

Soil fertility and soil loss constraints on crop residue removal for energy production  

DOE Green Energy (OSTI)

A summary of the methodologies used to estimate the soil fertility and soil loss constraints on crop residue removal for energy production is presented. Estimates of excess residue are developed for wheat in north-central Oklahoma and for corn and soybeans in central Iowa. These sample farming situations are analyzed in other research in the Analysis Division of the Solar Energy Research Institute.

Flaim, S.

1979-07-01T23:59:59.000Z

491

Energy-Efficient Speed Scheduling for Real-Time Tasks under Thermal Constraints  

E-Print Network (OSTI)

Energy-Efficient Speed Scheduling for Real-Time Tasks under Thermal Constraints Shengquan Wang. We develop energy-efficient speed scheduling schemes for frame-based real-time tasks under thermal in order to achieve thermal-constrained energy-efficient design. However, this does not work. The existing

Wang, Shengquan

492

Auction-Based Throughput Maximization in Cognitive Radio Networks Under Interference Constraint  

Science Conference Proceedings (OSTI)

Cognitive radio is an emerging technique to improve the utilization of radio frequency spectrum in wireless communication networks. That is, spectrum efficiency can be increased significantly by giving opportunistic access of the frequency bands to a ... Keywords: Auction, Channel assignment, Cognitive radio, Graph theory, Interference constraint, OSI cross layer applications

Hakan Murat Karaca, Tolga Kurt, Salih Zafer Dicle, Emin Anarim

2013-09-01T23:59:59.000Z

493

Robust control strategies facing disturbances in manufacturing workshops with time constraints  

Science Conference Proceedings (OSTI)

Developments presented in this paper are devoted to the robustness control of manufacturing job-shops with time constraints and without assembling tasks. Such systems have robustness properties which allow them to face time disturbances. Three robust ... Keywords: Control strategies, Manufacturing, P-time Petri net, Robustness, Time disturbance

Anis Mhalla, Nabil Jerbi, Simon Collart Dutilleul, Etienne Craye, Mohamed Benrejeb

2013-06-01T23:59:59.000Z

494

High Performance Biomorphic Image Processing Under Tight Space and Power Constraints  

Science Conference Proceedings (OSTI)

Image processing for space systems must be performed under tight space and power constraints while not compromising performance. Traditional computer vision approaches are not ideal because they are notoriously power hungry and physically large. We present ... Keywords: centroid localization chip, computational sensing, focal-plane processing, image process chip, motion detection chip, spatiotemporal convolution chip, vision chip

Ralph Etienne-Cummings; Viktor Gruev; Mathew Clapp

2001-11-01T23:59:59.000Z

495

A distributed computing environment with support for constraint-based task scheduling and scientific experimentation  

SciTech Connect

This paper describes a computing environment which supports computer-based scientific research work. Key features include support for automatic distributed scheduling and execution and computer-based scientific experimentation. A new flexible and extensible scheduling technique that is responsive to a user`s scheduling constraints, such as the ordering of program results and the specification of task assignments and processor utilization levels, is presented. An easy-to-use constraint language for specifying scheduling constraints, based on the relational database query language SQL, is described along with a search-based algorithm for fulfilling these constraints. A set of performance studies show that the environment can schedule and execute program graphs on a network of workstations as the user requests. A method for automatically generating computer-based scientific experiments is described. Experiments provide a concise method of specifying a large collection of parameterized program executions. The environment achieved significant speedups when executing experiments; for a large collection of scientific experiments an average speedup of 3.4 on an average of 5.5 scheduled processors was obtained.

Ahrens, J.P.; Shapiro, L.G.; Tanimoto, S.L. [Univ. of Washington, Seattle, WA (United States). Dept. of Computer Science and Engineering

1997-04-01T23:59:59.000Z

496

Constraint solving for beautiful user interfaces: how solving strategies support layout aesthetics  

Science Conference Proceedings (OSTI)

Layout managers provide an automatic way to place controls in a graphical user interface (GUI). With the wide distribution of fully GUI-enabled smartphones, as well as very large or even multiple personal desktop monitors, the logical size of commonly ... Keywords: GUIs, aesthetics, constraint based layout, layout manager

Clemens Zeidler; Christof Lutteroth; Gerald Weber

2012-07-01T23:59:59.000Z

497

Using Constraint Satisfaction Problem approach to solve human resource allocation problems in cooperative health services  

Science Conference Proceedings (OSTI)

In developing countries, the increasing utilization of health services, due to a great life expectancy, is followed by a reduction in incomes from the public health system and from private insurance companies, to the payment of medical procedures. Beyond ... Keywords: Backtracking search algorithm, Constraint Satisfaction Problem, Cooperative services, Heuristics, Human resource allocation

Cicero Ferreira Fernandes Costa Filho; Dayse Aparecida Rivera Rocha; Marly Guimarăes Fernandes Costa; Wagner Coelho de Albuquerque Pereira

2012-01-01T23:59:59.000Z

498

Time optimization and state-dependent constraints in the quantum optimal control of molecular orientation  

E-Print Network (OSTI)

We apply two recent generalizations of monotonically convergent optimization algorithms to the control of molecular orientation by laser fields. We show how to minimize the control duration by a step-wise optimization and maximize the field-free molecular orientation using state-dependent constraints. We discuss the physical relevance of the different results.

M. Ndong; C. Koch; D. Sugny

2013-08-03T23:59:59.000Z

499