Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Remediation program to perform slope-side cleanup near Smith's Marketplace May 1, 2015 Los Alamos National Laboratory is performing a high-angle canyon-side cleanup on U.S....
Reputation Systems in Labor and Advertising Marketplaces
Daltayanni, Maria
2015-01-01T23:59:59.000Z
Reputation Systems in Advertising Marketplaces Auto-SYSTEMS IN LABOR AND ADVERTISING MARKETPLACES A dissertationSystems in Labor and Advertising Marketplaces by Maria
2015 Energy, Technology & Education Festival Innovation Marketplace...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
2015 Energy, Technology & Education Festival Innovation Marketplace & Career Fair 2015 Energy, Technology & Education Festival Innovation Marketplace & Career Fair September 16,...
Acton, Scott
About the Health Insurance Marketplace 8 things you can do to get ready now 1. Explore current options. You may be able to get coverage now through existing programs. Visit HealthCare.gov to learn more about health insurance for adults up to age 26 and programs for people and children in families
Online Marketplace for Residential Measures
Ashe,J.; MBA; BEP
2014-01-01T23:59:59.000Z
energy™ Online Marketplace for Residential Measures 2014 Program Year ESL-KT-14-11-09 CATEE 2014: Clean Air Through Efficiency Conference, Dallas, Texas Nov. 18-20 Delivery Channels/Options ? Online Marketplace/ Drop Ship Method 2© Copyright 2014... CLEAResult. All rights reserved. ESL-KT-14-11-09 CATEE 2014: Clean Air Through Efficiency Conference, Dallas, Texas Nov. 18-20 Advantages of Online Marketplace ? Target a different/convenience shopper to complement existing offers ? Customer verification...
Online Marketplace for Residential Measures
Ashe,J.; MBA; BEP
2014-01-01T23:59:59.000Z
We change the way people use energy™ Online Marketplace for Residential Measures 2014 Program Year ESL-KT-14-11-09 CATEE 2014: Clean Air Through Efficiency Conference, Dallas, Texas Nov. 18-20 Delivery Channels/Options ? Online Marketplace/ Drop... Ship Method 2© Copyright 2014 CLEAResult. All rights reserved. ESL-KT-14-11-09 CATEE 2014: Clean Air Through Efficiency Conference, Dallas, Texas Nov. 18-20 Advantages of Online Marketplace ? Target a different/convenience shopper to complement...
"The dance of the marketplace"
Bolaños, Michael Raul
1983-01-01T23:59:59.000Z
Architecture as infill; or the method by which the patterns of context are synthesized in the process of intervention, stands as the base of this thesis. The work uses and defines the marketplace as a building type generated ...
Tsien, Roger Y.
Marketplace Training Marketplace offers several training opportunities below. To request a dedicated training for your department or group, or for general questions about Marketplace please contact
New Ideas for Seeding Your Solar Marketplace Workshop Panel Presentati...
Broader source: Energy.gov (indexed) [DOE]
SESSION: THE NEW SCIENCE OF SOFT COSTS New Ideas for Seeding Your Solar Marketplace Workshop Agenda New Ideas for Seeding Your Solar Marketplace Workshop Presentation, Adam Cohen...
Geothermal Direct Use Technology and the Marketplace | Department...
Office of Environmental Management (EM)
Direct Use Technology and the Marketplace Geothermal Direct Use Technology and the Marketplace Geothermal energy applications are emerging across a much wider spectrum of cascaded...
Wu, Shin-Tson
Health Insurance Marketplace Notification UCF is required to furnish the accompanying Health provides the following information: Information on Health Insurance Marketplace - visit www.HealthCare.gov Information About Health Coverage Offered by the State of Florida Contact Information for People First, SOF
The broadcast marketplace : Designing a more efficient local marketplace for goods and services
Blackshaw, Matthew (Matthew Andrew)
2012-01-01T23:59:59.000Z
Today's online marketplaces for goods and services are imperfect. Participants make an initial post expressing their intention to buy or sell an object, but all offers on this post are private. These offers can be seen as ...
NIST Weights and Measures Division Marketplace
and inch-pound measurement units in a net quantity of contents statement. The term metric labeling refers to using only metric measurement units in a net quantity of contents statement. 2 (15 U.S.C. §§ 1451NIST Weights and Measures Division Marketplace Assessment Metric Labeling on Packages in Retail
Repeated Auction Games and Learning Dynamics in Electronic Logistics Marketplaces
Bertini, Robert L.
Repeated Auction Games and Learning Dynamics in Electronic Logistics Marketplaces: Complexity still satisfy the customer's level of service demands. Specifically, this chapter considers the reverse
Integrating Mobile Agent Technology into an e-Marketplace Solution
Integrating Mobile Agent Technology into an e-Marketplace Solution - The InterMarket Marketplace. The mobile agent technology might take e-commerce trading to the next phase. Mobile agents are intelligent technology. A feasibility study, made for two existing software applications, the mobile-agent system Tracy
New Health Insurance Marketplace Coverage Options and Your Health Coverage
Sun, Yi
New Health Insurance Marketplace Coverage Options and Your Health Coverage PART A: General Information When key parts of the health care law take effect in 2014, there will be a new way to buy health insurance: the Health Insurance Marketplace. To assist you as you evaluate options for you and your family
New Ideas for Seeding Your Solar Marketplace Workshop Presentation...
Broader source: Energy.gov (indexed) [DOE]
presentation by Adam Cohen, fellow for the SunShot Initiative, for the 2014 SunShot Grand Challenge Summit and Peer Review Workshop, "New Ideas for Seeding Your Solar Marketplace:...
An exploratory study of B2B marketplaces
Minier, Denise Nicole, 1971-
2003-01-01T23:59:59.000Z
A business-to-business (B2B) e-marketplace brings together buyers and sellers using the Internet to conduct or facilitate business transactions. They came onto the scene in the late 1990's. There are independent exchanges, ...
Energy and the deregulated marketplace 1998 survey
Fowler, R.B. [ed.] [comp.
1999-09-01T23:59:59.000Z
In this comprehensive survey of the energy and deregulated marketplace, 911 respondents indicate how deregulation will impact their business. Well organized for easy reference this published survey report provides answers on how companies will procure electricity and natural gas, and what criteria will be used in their decision process. The results presented also illustrate effect of real time pricing on the procurement of energy equipment. Readers will be able to see whether companies are delaying the purchase of energy efficiency equipment as a result of deregulation, as well as what current trends are developing in the use of energy services and performance contracting. The performance and overall cost effectiveness of various types of energy efficient equipment is also rated by respondents, and the results of existing installations is reported. Responses are broken down and can be assessed by respondent categories, including utility, energy supplier, energy user, power marketer, ESCO, equipment supplier, and consultant. This survey report offers a valuable tool for all companies whose business and marketing strategies are impacted by deregulation.
Photovoltaics: From the laboratory to the marketplace
Basso, T.S.; Surek, T.; Thornton, J.
1991-03-01T23:59:59.000Z
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.
Constraints on the relic neutrino abundance and implications for cosmological neutrino mass limits
Bell, Nicole F.; /Fermilab
2004-01-01T23:59:59.000Z
The authors examine a mechanism which can lead to flavor transformation of neutrino-antineutrino asymmetries in the early universe, a process which is unavoidable when the neutrino mixing angles are large. This sets the best limit on the lepton number of the universe, and hence on the relic neutrino abundance. They also consider the consequences for the relic neutrino abundance if extra neutrino interactions are allowed, e.g., the coupling of the neutrinos to a light (compared to m{sub {nu}}) boson. For a wide range of couplings not excluded by other considerations, the relic neutrinos would annihilate to bosons at late times, and thus make a negligible contribution to the matter density today. This mechanism evades the neutrino mass limits arising from large scale structure.
LD Diesels in U.S. Marketplace - Technical Progress Will Lead...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
LD Diesels in U.S. Marketplace - Technical Progress Will Lead to Cost-Effective Business Cases LD Diesels in U.S. Marketplace - Technical Progress Will Lead to Cost-Effective...
Los Alamos Lab to perform slope-side cleanup near Smith's Marketplace
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Los Alamos Lab to perform slope-side cleanup near Smith's Marketplace Los Alamos National Laboratory to perform slope-side cleanup near Smith's Marketplace The Lab is performing a...
The Art of the Start: Moving Science from the Lab to the Marketplace
Larry Bock
2010-01-08T23:59:59.000Z
April 25, 2009 Berkeley Lab Nano*High lecture: The Art of the Start: Moving Science from the Lab to the Marketplace
Baringer, Philip S.; Bean, Alice; Chen, C.; Clutter, Justace Randall; McGivern, Carrie Lynne; Moulik, Tania; Sekaric, Jadranka; Wilson, Graham Wallace; Aaltonen, T.; Abazov, V. M.; Abbott, B.; Abolins, M.; Acharya, B. S.; Adams, M.; Adams, T.
2010-07-15T23:59:59.000Z
Combined Tevatron upper limit on gg! H! WþW#1; and constraints on the Higgs boson mass in fourth-generation fermion models T. Aaltonen,15,a V.M. Abazov,48,b B. Abbott,116,b M. Abolins,101,b B. S. Acharya,35,b M. Adams,79,b T. Adams,75,b J. Adelman...,78,a E. Aguilo,7,b G.D. Alexeev,48,b G. Alkhazov,52,b A. Alton,99,ii B. A´lvarez Gonza´lez,56,aa G. Alverson,94,b G. A. Alves,2,b S. Amerio,39a,a D. Amidei,99,a A. Anastassov,81,a L. S. Ancu,47,b A. Annovi,37,a J. Antos,53,a M. Aoki,77,b G. Apollinari...
INNOVATION MARKETPLACE A QUARTERLY UPDATE OF AVAILABLE TECHNOLOGIES...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
the need for smaller electronic devices and emerging technologies, such as microelectromechanical systems (MEMS). Due to the size constraints of such a technology, there is a need...
A marketplace game with neither distribution costs nor distribution-capacity constraints
Squicciarini, Anna Cinzia
). We model aggregate consumer demand to be linear in response to clearing price1, D() = Dmax(1-/max location based prices, for all consumers (demand aggregators or individual loads). Unlike [5], the retailer), and · consumers (electricity demand aggregators or individual loads). Consistent with an ISO, we assume
van der Aalst, Wil
As the BPM marketplace continues its rapid evolution, there is an increasing array of technology) the increasing diversity of offerings that fall under the BPM technology umbrella, and (2) the complexity. As illustrated in Figure 1, the potential range of tech- nologies on which a BPM solution might be based
Insurable Storage Services: Creating a Marketplace for Long-Term Document Archival
Simha, Rahul
Insurable Storage Services: Creating a Marketplace for Long-Term Document Archival K. Gopinath1 Washington, DC 20052, USA simha@gwu.edu Abstract Digital storage is a key element not only of computing-capacity storage. At the same time, the storage needs of users have now become more sophisticated and diverse. Some
On Analyzing and Developing Data Contracts in Cloud-based Data Marketplaces
Dustdar, Schahram
providers offer data. While techniques for making data available through DaaS are well-developed, weOn Analyzing and Developing Data Contracts in Cloud-based Data Marketplaces Hong-Linh Truong, G,depaoli}@disco.unimib.it Abstract--Currently, rich and diverse data types have been increasingly provided using the Data
Paper ID #9832 Using a Marketplace to Form Multidisciplinary Systems Engineering Cap-
Ardis, Mark
Engineering from the University of Alabama in Huntsville (UAH) with a focus upon turbulent combustion modelingPaper ID #9832 Using a Marketplace to Form Multidisciplinary Systems Engineering Cap- stone Project in the professionalization of software engineering, and its relationship to systems engineering. In his career Mark has
Crowds, Gigs, and Super Sellers: A Measurement Study of a Supply-Driven Crowdsourcing Marketplace
Caverlee, James
Crowds, Gigs, and Super Sellers: A Measurement Study of a Supply-Driven Crowdsourcing Marketplace-driven mar- ketplace Fiverr wherein we investigate the sellers and their offerings (called "gigs participants and develop a machine learning based approach for inferring the qual- ity of gigs, which
The Current and Future Marketplace for Waste-To-Energy Cogeneration Facilities in the United States
Jacobs, S.
1988-01-01T23:59:59.000Z
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...
Wendy Hyman
2002-01-01T23:59:59.000Z
beyond the mis- guided veneration of images towards a more fundamental, ubiqui- tous problem. Idols of the Marketplace makes the case that Early Modern authors from Shakespeare to Bunyan thought of religious idolatry as a symptom of a culturally...
Impact of New Federal Efficiency Performance Standards on the Industrial Motor Marketplace
Elliott, R. N.
Conference, New Orleans, LA, May 12-15, 2009 percent increase over the previous two years. Rising electric rates, growing concerns about global warming, changes in the motor marketplace, and a new political environment in Washington create... of industry. This class of motors also accounts for a significant portion of the motor electricity consumption in the commercial sector (Nadel et al. 2002). Because of the large share of electricity consumption accounted for by this class of product...
Constraint Satisfaction Problems A Quick Overview
Brewka, Gerhard
solvable in polynomial time by linear programming #12;8 Varieties of constraints Unary constraints involve Ci limits the values that variables can take, e.g., V1 V2 A state is an assignment of values to some or all variables. Consistent assignment: assignment does not violate the constraints. #12
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5(Million Cubic Feet) Oregon (Including Vehicle Fuel) (Million CubicRefinersUpcomingSmall-Industrial Sign In About |Princeton Plasma Physics
Deutschmann, Rainer
Deutschmann, Senior Vice President, Mobile Internet at T-Mobile International. "Nokia Series 40 devices offerT-Mobile and Nokia collaborate to open up an integrated marketplace for mobile content and Internet and other content offered by both T-Mobile's widget gallery and Nokia's Ovi Store · Through T-Mobile's web
Mills, Kevin
I-TEX: A Marketplace for Information Technology Standards in the 21st Century BAA #99-07 Technical Topic Area: Information Technology Standards Technical PoCs: Administrative PoC: Dr. Kevin L. Mills Mrs Kumar NIST Email sri.kumar@nist.gov #12;BAA 99-07 Technical Topic Area: Information Technology Standards
Massachusetts at Amherst, University of
are implemented to manage the resources and interaction. We describe an Educational MarketPlace, or a system of tools, which match student queries to available and appropriate educational resources. Development techniques to facilitate access to large-scale educational repositories; 2) resource acquisition and data
Monadic constraint programming
Schrijvers, Tom; Stuckey, Peter; Wadler, Philip
2009-01-01T23:59:59.000Z
A constraint programming system combines two essential components: a constraint solver and a search engine. The constraint solver reasons about satisfiability of conjunctions of constraints, and the search engine controls the search for solutions...
IANNUCCI, JOE; EYER, JIM; BUTLER, PAUL C.
2003-02-01T23:59:59.000Z
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.
Not Available
1989-01-01T23:59:59.000Z
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.
Unitarity constraints on trimaximal mixing
Kumar, Sanjeev [Department of Physics and Astrophysics, University of Delhi, Delhi -110005 (India)
2010-07-01T23:59:59.000Z
When the neutrino mass eigenstate {nu}{sub 2} is trimaximally mixed, the mixing matrix is called trimaximal. The middle column of the trimaximal mixing matrix is identical to tribimaximal mixing and the other two columns are subject to unitarity constraints. This corresponds to a mixing matrix with four independent parameters in the most general case. Apart from the two Majorana phases, the mixing matrix has only one free parameter in the CP conserving limit. Trimaximality results in interesting interplay between mixing angles and CP violation. A notion of maximal CP violation naturally emerges here: CP violation is maximal for maximal 2-3 mixing. Similarly, there is a natural constraint on the deviation from maximal 2-3 mixing which takes its maximal value in the CP conserving limit.
Axion constraints in nonstandard thermal histories
Grin, Daniel; Smith, Tristan L.; Kamionkowski, Marc [California Institute of Technology, Mail Code 130-33, Pasadena, California 91125 (United States)
2008-04-15T23:59:59.000Z
It is usually assumed that dark matter is produced during the radiation-dominated era. There is, however, no direct evidence for radiation domination prior to big-bang nucleosynthesis. Two nonstandard thermal histories are considered. In one, the low-temperature-reheating scenario, radiation domination begins as late as {approx}1 MeV, and is preceded by significant entropy generation. Thermal axion relic abundances are then suppressed, and cosmological limits to axions are loosened. For reheating temperatures T{sub rh} < or approx. 35 MeV, the large-scale structure limit to the axion mass is lifted. The remaining constraint from the total density of matter is significantly relaxed. Constraints are also relaxed for higher reheating temperatures. In a kination scenario, a more modest change to cosmological axion constraints is obtained. Future possible constraints to axions and low-temperature reheating from the helium abundance and next-generation large-scale-structure surveys are discussed.
Edinburgh Research Explorer Statistical Constraints
Millar, Andrew J.
Edinburgh Research Explorer Statistical Constraints Citation for published version: Rossi, R that links statistics and constraint programming. We dis- cuss two novel statistical constraints and some, Prestwich, S & Tarim, SA 2014, 'Statistical Constraints' Paper presented at 21st biennial European
The Definition and Implementation of a Computer Programming Language Based on Constraints
Steele, Guy Lewis, Jr.
1980-08-01T23:59:59.000Z
The constraint paradigm is a model of computation in which values are deduced whenever possible, under the limitation that deductions be local in a certain sense. One may visualize a constraint 'program' as a network ...
Communication constraints in the state agreement problem Ruggero Carli
Ceragioli, Francesca
Communication constraints in the state agreement problem Ruggero Carli Fabio Fagnani Alberto and communication theory is becoming of fundamental importance in many distributed control systems. Particular of autonomous mobile agents in order to achieve a common task, communication constraints impose limits
A Note on the Asymptotic Limit of the Four Simplex
Suresh K Maran
2005-11-05T23:59:59.000Z
Recently the asymptotic limit of the Barrett-Crane models has been studied by Barrett and Steele. Here by a direct study, I show that we can extract the bivectors which satisfy the essential Barrett-Crane constraints from the asymptotic limit. Because of this the Schlaffi identity is implied by the asymptotic limit, rather than to be imposed as a constraint.
Cosmological Constraints on Isocurvature and Tensor Perturbations
Masahiro Kawasaki; Toyokazu Sekiguchi
2007-05-20T23:59:59.000Z
We investigate cosmological constraints on primordial isocurvature and tensor perturbations, using recent observations of the cosmic microwave background and the large scale structure. We find that present observations are consistent with purely adiabatic initial conditions for the structure formation under any priors on correlations of isocurvature modes, and upper limits on the contribution of isocurvature and tensor perturbations are presented. We also apply the obtained constraints to some specific theoretical models, axion isocurvature perturbation models and curvaton models, and give some implications for theoretical models.
Representing Trees with Constraints
Curry, Benjamin; Wiggins, Geraint; Hayes, Gillian
This paper presents a method for representing trees using constraint logic programming over finite domains. We describe a class of trees that is of particular interest to us and how we can represent the set of trees belonging to that class using...
Closed Crawl Space Performance: Proof of Concept in the Production Builder Marketplace
Malkin-Weber, Melissa; Dastur, Cyrus; Mauceri, Maria; Hannas, Benjamin
2008-10-30T23:59:59.000Z
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.
Innovative Feed-In Tariff Designs that Limit Policy Costs
Kreycik, C.; Couture, T. D.; Cory, K. S.
2011-06-01T23:59:59.000Z
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.
Hall, Jean P.
2014-12-01T23:59:59.000Z
and register to receive email alerts. Commonwealth Fund pub. 1792 Vol. 31 Why a National High-Risk Insurance Pool Is Not a Workable Alternative to the Marketplace Jean P. Hall Abstract The Pre-Existing Condition Insurance Plan (PCIP) was a national high-risk... to outline why national high-risk pools, which continue to be proposed as policy alternatives to ACA coverage expan- sions, are expensive to enrollees as well as their administrators and ultimately unsustainable. The key lesson—and the principle on which...
Constraint Orbital Branching JAMES OSTROWSKI
Linderoth, Jeffrey T.
of Ostrowski et al. [2007] to the case of branching on disjunctions formed by inequalities--constraint orbital
Triangle Packing with Constraint Programming
Prosser, P.
Prosser,P. 9th International Workshop on Constraint Modelling and Reformulation (ModRef 2010) pp 1-15
Constraints on new interactions from neutron scattering experiments
Yu. N. Pokotilovski
2006-01-19T23:59:59.000Z
Constraints for the constants of hypothetical Yukawa-type corrections to the Newtonian gravitational potential are obtained from analysis of neutron scattering experiments. Restrictions are obtained for the interaction range between 10^{-12} and 10^{-7} cm, where Casimir force experiments and atomic force microscopy are not sensitive. Experimental limits are obtained also for non-electromagnetic inverse power law neutron-nucleus potential. Some possibilities are discussed to strengthen these constraints.
Axion Constraints in Non-standard Thermal Histories
Grin, Daniel; Smith, Tristan; Kamionkowski, Marc [California Institute of Technology, Mail Code 130-33, Pasadena, CA 91125 (United States)
2009-09-08T23:59:59.000Z
There is no direct evidence for radiation domination prior to big-bang nucleosynthesis, and so it is useful to consider how constraints to thermally-produced axions change in non-standard thermal histories. In the low-temperature-reheating scenario, radiation domination begins as late as {approx}1 MeV, and is preceded by significant entropy generation. Axion abundances are then suppressed, and cosmological limits to axions are significantly loosened. In a kination scenario, a more modest change to axion constraints occurs. Future possible constraints to axions and low-temperature reheating are discussed.
Thermal axion constraints in non-standard thermal histories
Grin, Daniel; Smith, Tristan; Kamionkowski, Marc [California Institute of Technology, Mail Code 130-33, Pasadena, CA 91125 (United States)
2010-08-30T23:59:59.000Z
There is no direct evidence for radiation domination prior to big-bang nucleosynthesis, and so it is useful to consider how constraints to thermally-produced axions change in non-standard thermal histories. In the low-temperature-reheating scenario, radiation domination begins as late as {approx}1 MeV, and is preceded by significant entropy generation. Axion abundances are then suppressed, and cosmological limits to axions are significantly loosened. In a kination scenario, a more modest change to axion constraints occurs. Future possible constraints to axions and low-temperature reheating are discussed.
Thermal axion constraints in non-standard thermal histories
Daniel Grin; Tristan Smith; Marc Kamionkowski
2009-11-10T23:59:59.000Z
There is no direct evidence for radiation domination prior to big-bang nucleosynthesis, and so it is useful to consider how constraints to thermally-produced axions change in non-standard thermal histories. In the low-temperature-reheating scenario, radiation domination begins at temperatures as low as 1 MeV, and is preceded by significant entropy generation. Axion abundances are then suppressed, and cosmological limits to axions are significantly loosened. In a kination scenario, a more modest change to axion constraints occurs. Future possible constraints to axions and low-temperature reheating are discussed.
LOUISIANA COMMUNITY MARKETPLACE
Kundu, Sukhamay
will impact both the people of various poverty stricken communities as well as the non profit organizations HOPE Ministries and their work to help the poverty stricken people pick up the pieces and succeed. We
Acton, Scott
options. You may be able to get coverage now through existing programs. Visit HealthCare.gov to learn more, and coinsurance. You'll want to consider these details while you're exploring your options. Visit HealthCare will offer essential health benefits, including doctor visits, preventive care, hospitalization
Constraints on Lorentz violation from gravitational Cherenkov radiation
Kostelecky, Alan
2015-01-01T23:59:59.000Z
Limits on gravitational Cherenkov radiation by cosmic rays are obtained and used to constrain coefficients for Lorentz violation in the gravity sector associated with operators of even mass dimensions, including orientation-dependent effects. We use existing data from cosmic-ray telescopes to obtain conservative two-sided constraints on 80 distinct Lorentz-violating operators of dimensions four, six, and eight, along with conservative one-sided constraints on three others. Existing limits on the nine minimal operators at dimension four are improved by factors of up to a billion, while 74 of our explicit limits represent stringent first constraints on nonminimal operators. Prospects are discussed for future analyses incorporating effects of Lorentz violation in the matter sector, the role of gravitational Cherenkov radiation by high-energy photons, data from gravitational-wave observatories, the tired-light effect, and electromagnetic Cherenkov radiation by gravitons.
Spacetime constraints on accreting black holes
Garofalo, David [Jet Propulsion Laboratory, California Institute of Technology, Pasadena California 91109 (United States)
2009-06-15T23:59:59.000Z
We study the spin dependence of accretion onto rotating Kerr black holes using analytic techniques. In its linear regime, angular momentum transport in MHD turbulent accretion flow involves the generation of radial magnetic field connecting plasma in a differentially rotating flow. We take a first principles approach, highlighting the constraint that limits the generation and amplification of radial magnetic fields, stemming from the transfer of energy from mechanical to magnetic form. Because the energy transferred in magnetic form is ultimately constrained by gravitational potential energy or Killing energy, the spin dependence of the latter allows us to derive spin-dependent constraints on the success of the accreting plasma to expel its angular momentum. We find an inverse relationship between this ability and black hole spin. If this radial magnetic field generation forms the basis for angular momentum transfer in accretion flows, accretion rates involving Kerr black holes are expected to be lower as the black hole spin increases in the prograde sense.
Bidarra, Rafael
of current constraint solvers. In this paper, an approach to the optimization of geometric constraint solving, in a feature modeling system the designer builds a model out of features, each of which has a well and orient it, or constraints that express the physical limits of the drilling machinery avail- able
Determining physical constraints in transcriptional initiationcomplexes using DNA sequence analysis
Shultzaberger, Ryan K.; Chiang, Derek Y.; Moses, Alan M.; Eisen,Michael B.
2007-07-01T23:59:59.000Z
Eukaryotic gene expression is often under the control ofcooperatively acting transcription factors whose binding is limited bystructural constraints. By determining these structural constraints, wecan understand the "rules" that define functional cooperativity.Conversely, by understanding the rules of binding, we can inferstructural characteristics. We have developed an information theory basedmethod for approximating the physical limitations of cooperativeinteractions by comparing sequence analysis to microarray expressiondata. When applied to the coordinated binding of the sulfur amino acidregulatory protein Met4 by Cbf1 and Met31, we were able to create acombinatorial model that can correctly identify Met4 regulatedgenes.
Supertree Construction with Constraint Programming
Gent, I.P.; Prosser, P.
Gent,I.P. Prosser,P. Smith,B.M. Wei,W. Principles and Practice of Constraint Programming pp 837-841 Springer
Acton, Scott
Marketplace at HealthCare.gov. Health coverage starts as early as January 1, 2014, and open enrollment ends other sources in 2014. If you don't have coverage, you may have to pay a fee. When you visit HealthCare of HealthCare.gov to apply, compare your options, and enroll in coverage. If you run a small business, you
Protection and Affordable Care Act, also known as the health care reform law, go into effect January 1, 2014 by the health care reform law (i.e., the plan's share of the total allowed benefit costs covered by the planNew Health Insurance Marketplace Coverage Options and Your Health Coverage Key parts of the Patient
Vehicle Technology Deployment Pathways: An Examination of Timing and Investment Constraints
Broader source: Energy.gov [DOE]
Analysts may develop scenarios of the deployment of new vehicle technologies for a variety of reasons, ranging from pure thought exercises for hypothesizing about the future, to careful examinations of the possible outcomes of future policies or trends in technology, to examination of the feasibility of broad goals of reducing greenhouse gases and/or oil use. To establish a scenario's plausibility, analysts will seek to make their underlying assumptions clear and to "reality check" the story they tell about technology development and deployment in the marketplace. This report examines two aspects of "reality checking"—(1) whether the timing of the vehicle deployment envisioned by the scenarios corresponds to recognized limits to technology development and market penetration and (2) whether the investments that must be made for the scenario to unfold seem viable from the perspective of the investment community.
Title 10 USC 2684a Agreements to Limit Encroachments and Other...
Limit Encroachments and Other Constraints on Military Training, Testing, and Operations Jump to: navigation, search OpenEI Reference LibraryAdd to library Legal Document-...
On the Equivalence of Constraint Satisfaction Francesca Rossi1
On the Equivalence of Constraint Satisfaction Problems Francesca Rossi1 Charles Petrie MCC 3500 W equivalent if they have the same solution set. We nd this de nition limiting, and develop a more general de a pair of CSPs equivalent even if they have di erent solutions. The basic idea behind the extended scheme
CONSTRAINT PROPAGATION IN KIMMO SYSTEMS G. Edward Barton, Jr.
CONSTRAINT PROPAGATION IN KIMMO SYSTEMS G. Edward Barton, Jr. M.I.T. Artificial Intelligence into place step-by-step through a chain of limited and local inferences, but it is insuffi- ciently powerful for Kimmo generation works for English, Turkish, and Warlpiri. When applied to a Kimmo system that en- codes
Energy-Efficient Speed Scheduling for Real-Time Tasks under Thermal Constraints
Wang, Shengquan
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, Jian-Jia Chen, Zhenjun Shi, and Lothar Thiele Abstract Thermal constraints have limited
Facing Title V permit constraints
Patankar, U.M. [JACA Corp., Fort Washington, PA (United States)
1995-06-01T23:59:59.000Z
The new Title V operating permit requirement under state regulations pursuant to the 1990 Clean Air Act Amendments will cover every emission source at a facility. These rules will significantly affect an operation by setting minimum compliance requirements, mandating periodic compliance certification, prescribing complex monitoring, record keeping and reporting procedures and making state and EPA approval of routine operational changes necessary through a permit amendment. The main concern with Title V is its effect on the operational flexibility of a facility, and individual emission sources within that facility. Unless properly addressed in a permit document, the term operational flexibility, so freely used by regulators in the context of the Title V program, can turn into a misnomer and the ability to operate as before may be significantly compromised under Title V. True operational flexibility is essential for businesses to respond to real changes in the marketplace. In the age of automation, just-in-time inventories and increased competition, flexibility to operate can mean the difference between growth and stagnation.
Upper limit on branching ratio the decay B. Bassalleck,
National Laboratory (BNL). The decay forbidden angular momentum conservation neutrinos purely massless left## # cosmological constraints neutrino masses imply more stringent limits. branching 0 ## case massive Majorana Brookhaven National Laboratory, Upton, New 11973, USA TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia
Inversion of tracer test data using tomographic constraints Niklas Linde,1,2
Hubbard, Susan
Inversion of tracer test data using tomographic constraints Niklas Linde,1,2 Stefan Finsterle,3 be limited to field sites where this condition is partially or fully satisfied. Citation: Linde, N., S
The acquisition of inductive constraints
Kemp, Charles, Ph. D. Massachusetts Institute of Technology
2008-01-01T23:59:59.000Z
Human learners routinely make inductive inferences, or inferences that go beyond the data they have observed. Inferences like these must be supported by constraints, some of which are innate, although others are almost ...
"Constraint consistency" at all orders in Cosmological perturbation theory
Nandi, Debottam
2015-01-01T23:59:59.000Z
We study the equivalence of two - order-by-order Einstein's equation and Reduced action - approaches to cosmological perturbation theory at all orders for different models of inflation. We point out a crucial consistency check which we refer to as "Constraint consistency" that needs to be satisfied. We propose a quick and efficient method to check the consistency for any model including modified gravity models. Our analysis points out an important feature which is crucial for inflationary model building i.e., all `constraint' inconsistent models have higher order Ostrogradsky's instabilities but the reverse is not true. In other words, one can have models with constraint lapse function and shift vector, though it may have Ostrogradsky's instabilities. We also obtain the single variable equation for non-canonical scalar field in the limit of power-law inflation for the second-order perturbed variables.
"Constraint consistency" at all orders in Cosmological perturbation theory
Debottam Nandi; S. Shankaranarayanan
2015-02-12T23:59:59.000Z
We study the equivalence of two - order-by-order Einstein's equation and Reduced action - approaches to cosmological perturbation theory at all orders for different models of inflation. We point out a crucial consistency check which we refer to as "Constraint consistency" that needs to be satisfied. We propose a quick and efficient method to check the consistency for any model including modified gravity models. Our analysis points out an important feature which is crucial for inflationary model building i.e., all `constraint' inconsistent models have higher order Ostrogradsky's instabilities but the reverse is not true. In other words, one can have models with constraint lapse function and shift vector, though it may have Ostrogradsky's instabilities. We also obtain the single variable equation for non-canonical scalar field in the limit of power-law inflation for the second-order perturbed variables.
NONE
1998-10-01T23:59:59.000Z
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.
Teplitz, V L; Anderson, J D; Rosenbaum, D C; Scalise, R J; Wentzler, P; Teplitz, Vigdor L.; Anderson, John D.; Rosenbaum, Doris; Scalise, Randall J.; Wentzler, Paul
1999-01-01T23:59:59.000Z
We compute the temperature and IR signal of particles of radius $a$ and albedo $\\alpha$ at heliocentric distance $R$, taking into account the emissivity effect, and give an interpolating formula for the result. We compare with analyses of COBE DIRBE data by others (including recent detection of the cosmic IR background) for various values of heliocentric distance, $R$, particle radius, $a$, and particle albedo, $\\alpha$. We then apply these results to a recently-developed picture of the Kuiper belt as a two-sector disk with a nearby, low-density sector (40
Constraints on Cardassian Expansion
W. J. Frith
2003-11-10T23:59:59.000Z
High redshift supernovae and Cosmic Microwave Background data are used to constrain the Cardassian expansion model (Freese & Lewis 2002), a cosmology in which a modification to the Friedmann equation gives rise to a flat, matter-dominated Universe which is currently undergoing a phase of accelerated expansion. In particular, the precision of the positions of the Doppler peaks in the CMB angular power spectrum provided by WMAP tightly constrains the cosmology. The available parameter space is further constrained by various high redshift supernova datasets taken from Tonry et al. (2003), a sample of 230 supernovae collated from the literature, in which fits to the distance and extinction have been recomputed where possible and a consistent zero-point has been applied. In addition, the Cardassian model can also be loosely constrained by inferred upper limits on the epoch at which the Cardassian term in the modified Friedmann equation begins to dominate the expansion (z_eq). Using these methods, a Cardassian cosmology is constrained at the 2 sigma level to 0.191, as opposed to the supernova data which supports a high-Omega_m, low-n cosmology.
Searching for quantum optimal controls under severe constraints
Gregory Riviello; Katharine Moore Tibbetts; Constantin Brif; Ruixing Long; Re-Bing Wu; Tak-San Ho; Herschel Rabitz
2015-02-03T23:59:59.000Z
The success of quantum optimal control for both experimental and theoretical objectives is connected to the topology of the corresponding control landscapes, which are free from local traps if three conditions are met: (1) the quantum system is controllable, (2) the Jacobian of the map from the control field to the evolution operator is of full rank, and (3) there are no constraints on the control field. This paper investigates how the violation of assumption (3) affects gradient searches for globally optimal control fields. The satisfaction of assumptions (1) and (2) ensures that the control landscape lacks fundamental traps, but certain control constraints can still introduce artificial traps. Proper management of these constraints is an issue of great practical importance for numerical simulations as well as optimization in the laboratory. Using optimal control simulations, we show that constraints on quantities such as the number of control variables, the control duration, and the field strength are potentially severe enough to prevent successful optimization of the objective. For each such constraint, we show that exceeding quantifiable limits can prevent gradient searches from reaching a globally optimal solution. These results demonstrate that careful choice of relevant control parameters helps to eliminate artificial traps and facilitate successful optimization.
Supernova constraints on a superlight gravitino
Dicus, D.A. [Univ. of Texas, Austin, TX (United States). Dept. of Physics; Mohapatra, R.N. [Univ. of Maryland, College Park, MD (United States). Dept. of Physics; Teplitz, V.L. [Southern Methodist Univ., Dallas, TX (United States). Dept. of Physics
1997-10-01T23:59:59.000Z
In supergravity models with low supersymmetry breaking scale the gravitinos can be superlight, with mass in the 10{sup -6} eV to few keV range. In such a case, gravitino emission provides a new cooling mechanism for protoneutron stars and therefore can provide constraints on the mass of a superlight gravitino. This happens because the coupling to matter of superlight gravitinos is dominated by its goldstino component, whose coupling to matter of superlight gravitinos is dominated by its goldstino component, whose coupling to matter is inversely proportional to the scale of supersymmetry breaking and increases as the gravitino mass decreases. Present observations therefore provide lower limits on the gravitino mass. Using the recently revised goldstino couplings, we find that the two dominant processes in supernova cooling are e{sup +} e{sup -} {yields} GG and {gamma}+e{sup -} {yields} e{sup -} GG. They lead to a lower limit on the supersymmetry breaking scale {Lambda}{sub s} from 160 to 500 GeV for core temperatures 30 to 60 MeV and electron chemical potentials 200 to 300 MeV. The corresponding lower limits on the gravitino mass are .6 - 6 x 10{sup -6} eV.
Primordial Nucleosynthesis Constraints on Z' Properties
Vernon Barger; Paul Langacker; Hye-Sung Lee
2003-02-13T23:59:59.000Z
In models involving new TeV-scale Z' gauge bosons, the new U(1)' symmetry often prevents the generation of Majorana masses needed for a conventional neutrino seesaw, leading to three superweakly interacting ``right-handed'' neutrinos nu_R, the Dirac partners of the ordinary neutrinos. These can be produced prior to big bang nucleosynthesis by the Z' interactions, leading to a faster expansion rate and too much ^4He. We quantify the constraints on the Z' properties from nucleosynthesis for Z' couplings motivated by a class of E_6 models parametrized by an angle theta_E6. The rate for the annihilation of three approximately massless right-handed neutrinos into other particle pairs through the Z' channel is calculated. The decoupling temperature, which is higher than that of ordinary left-handed neutrinos due to the large Z' mass, is evaluated, and the equivalent number of new doublet neutrinos Delta N_nu is obtained numerically as a function of the Z' mass and couplings for a variety of assumptions concerning the Z-Z' mixing angle and the quark-hadron transition temperature T_c. Except near the values of theta_E6 for which the Z' decouples from the right-handed neutrinos, the Z' mass and mixing constraints from nucleosynthesis are much more stringent than the existing laboratory limits from searches for direct production or from precision electroweak data, and are comparable to the ranges that may ultimately be probed at proposed colliders. For the case T_c = 150 MeV with the theoretically favored range of Z-Z' mixings, Delta N_nu 4.3 TeV for any value of theta_E6. Larger mixing or larger T_c often lead to unacceptably large Delta N_nu except near the nu_R decoupling limit.
Turtle: A Constraint Imperative Programming Language
Hofstedt, Petra
Turtle: A Constraint Imperative Programming Language Martin Grabm¨uller and Petra Hofstedt of the programming language Turtle, which inte- grates declarative constraints and imperative language elements Introduction Programming languages can be divided into two main categories: imperative and declarative
Parallelism Constraints Katrin Erk Joachim Niehren
Paris-Sud XI, UniversitÃ© de
Parallelism Constraints Katrin Erk Joachim Niehren Programming Systems Lab, UniversitÂ¨at des Saarlandes, SaarbrÂ¨ucken, Germany www.ps.uni-sb.de/~{erk,niehren} Abstract. Parallelism constraints
On the Role of Update Constraints and TextTypes in Iterative Learning
Stephan, Frank
On the Role of Update Constraints and TextTypes in Iterative Learning Sanjay Jain 1,# , Timo learning considers therefore the usage of classpreserving oneone hypothesis spaces which limit this type of coding during the learning process. Other ways to limit it is to control the amount and types of updates
Reconciling Nuclear and Astrophysical Constraints
Dexheimer, V; Schramm, S
2015-01-01T23:59:59.000Z
In view of new constraints put forth by recent observations and measurements in the realm of astrophysics and nuclear physics, we update the non-linear realization of the sigma model as to reflect such constraints. By doing this, we obtain new equations of state that may be used to describe neutron stars. Such equations of state are obtained by investigating different ways by which the vector mesons self-interact. Furthermore, we also investigate the role played by the delta mesons in the model. As a result, we are able to develop equations of state that are in better agreement with data, such as nuclear compressibility and slope of the symmetry energy at saturation, star masses, radii, and cooling profiles.
Possible Upper limits on Lorentz Factors in High Energy Astrophysical Processes
C. Sivaram; Kenath Arun
2010-08-31T23:59:59.000Z
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.
Towards consistent Electroweak Precision Data constraints in the SMEFT
Laure Berthier; Michael Trott
2015-05-06T23:59:59.000Z
We discuss the impact of many previously neglected effects of higher dimensional operators when fitting to Electroweak Precision data (EWPD) in the Standard Model Effective Field Theory (SMEFT). We calculate the general case of $2 \\rightarrow 2$ fermion scattering in the SMEFT to order $\\mathcal{O}(\\bar{v}_T^2/\\Lambda^2)$ valid on and off the $Z$ pole, in the massless fermion limit. We demonstrate that previously neglected corrections scale as $\\Gamma_Z M_Z/\\bar{v}_T^2$ in the partial widths extracted from measured cross sections at LEPI, compared to the leading effect of dimension six operators in anomalous $Z$ couplings. Further, constraints on leading effects of anomalous $Z$ couplings are also modified by neglected perturbative corrections and dimension eight operators. We perform a minimal EWPD fit to illustrate the size of the error these corrections induce, when bounding leading effects. These considerations relax bounds compared to a naive leading order analysis, and show that constraints that rise above the percent level are subject to substantial theoretical uncertanties. We also argue that renormalization group running global constraints expressed through $\\chi^2$ functions to a common scale, and then minimizing and performing a global fit of all data allows more consistent constraints to be obtained in the SMEFT.
Dark matter CMB constraints and likelihoods for poor particle physicists
Cline, James M.; Scott, Pat, E-mail: jcline@physics.mcgill.ca, E-mail: patscott@physics.mcgill.ca [Department of Physics, McGill University, 3600 rue University, Montréal, QC, H3A 2T8 (Canada)
2013-03-01T23:59:59.000Z
The cosmic microwave background provides constraints on the annihilation and decay of light dark matter at redshifts between 100 and 1000, the strength of which depends upon the fraction of energy ending up in the form of electrons and photons. The resulting constraints are usually presented for a limited selection of annihilation and decay channels. Here we provide constraints on the annihilation cross section and decay rate, at discrete values of the dark matter mass m{sub ?}, for all the annihilation and decay channels whose secondary spectra have been computed using PYTHIA in arXiv:1012.4515 (''PPPC 4 DM ID: a poor particle physicist cookbook for dark matter indirect detection''), namely e, ?, ?, V ? e, V ? ?, V ? ?, u, d s, c, b, t, ?, g, W, Z and h. By interpolating in mass, these can be used to find the CMB constraints and likelihood functions from WMAP7 and Planck for a wide range of dark matter models, including those with annihilation or decay into a linear combination of different channels.
General Properties and Termination Conditions for Soft Constraint Propagation
Rossi, Francesca
General Properties and Termination Conditions for Soft Constraint Propagation S. Bistarelli (bista for its termination. 1. Introduction Soft constraints allow to model faithfully many reallife problems [14], probabilistic [10] and partial [11] constraints. The constraint propagation techniques usually
Quantum Spin Dynamics VIII. The Master Constraint
Thomas Thiemann
2005-10-04T23:59:59.000Z
Recently the Master Constraint Programme (MCP) for Loop Quantum Gravity (LQG) was launched which replaces the infinite number of Hamiltonian constraints by a single Master constraint. The MCP is designed to overcome the complications associated with the non -- Lie -- algebra structure of the Dirac algebra of Hamiltonian constraints and was successfully tested in various field theory models. For the case of 3+1 gravity itself, so far only a positive quadratic form for the Master Constraint Operator was derived. In this paper we close this gap and prove that the quadratic form is closable and thus stems from a unique self -- adjoint Master Constraint Operator. The proof rests on a simple feature of the general pattern according to which Hamiltonian constraints in LQG are constructed and thus extends to arbitrary matter coupling and holds for any metric signature. With this result the existence of a physical Hilbert space for LQG is established by standard spectral analysis.
Health Insurance Marketplace Notice New Health Insurance Marketplace...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Options and Your Health Coverage PART A: General Information When key parts of the health care law take effect in 2014, there will be a new way to buy health insurance: the...
Marketplace Maturity | Department of Energy
Broader source: Energy.gov (indexed) [DOE]
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,Separation 23 362 ofSubscribe toDepartmentDraftRSSLeucadia Energy LAKE*DepartmentAnWhitney - PrincipalReportsPhoto
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onsource History View New PagessourceRaven Biofuels Internationalsource History View New Pages Recentform
Strong Planck constraints on braneworld and non-commutative inflation
Calcagni, Gianluca [Instituto de Estructura de la Materia, CSIC, Serrano 121, 28006 Madrid (Spain); Kuroyanagi, Sachiko; Ohashi, Junko; Tsujikawa, Shinji, E-mail: calcagni@iem.cfmac.csic.es, E-mail: skuro@rs.tus.ac.jp, E-mail: j1211703@ed.tus.ac.jp, E-mail: shinji@rs.kagu.tus.ac.jp [Department of Physics, Faculty of Science, Tokyo University of Science, 1-3, Kagurazaka, Shinjuku-ku, Tokyo 162-8601 (Japan)
2014-03-01T23:59:59.000Z
We place observational likelihood constraints on braneworld and non-commutative inflation for a number of inflaton potentials, using Planck, WMAP polarization and BAO data. Both braneworld and non-commutative scenarios of the kind considered here are limited by the most recent data even more severely than standard general-relativity models. At more than 95 % confidence level, the monomial potential V(?)??{sup p} is ruled out for p ? 2 in the Randall-Sundrum (RS) braneworld cosmology and, for p > 0, also in the high-curvature limit of the Gauss-Bonnet (GB) braneworld and in the infrared limit of non-commutative inflation, due to a large scalar spectral index. Some parameter values for natural inflation, small-varying inflaton models and Starobinsky inflation are allowed in all scenarios, although some tuning is required for natural inflation in a non-commutative spacetime.
A constraint graph representation of metamorphic linkages
Li, D; Zhang, Z; McCarthy, JM
2011-01-01T23:59:59.000Z
constraints from kinematic chains, Mechanism and Machineand multiple joint kinematic chains, Mechanism and MachineCreation of Mechanisms According to Kinematic Structure and
The Complexity of Equality Constraint Languages
Bodirsky, Manuel
a solution if and only if it contains an inequality-constraint x = y such that y is reachable from x
The Complexity of Equality Constraint Languages
Bodirsky, Manuel
. Then it is easy to see that S does not have a solution if and only if it contains an inequality-constraint x = y
Performance, Market and Manufacturing Constraints relevant to...
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
constraints on the viability of a mass market thermoelectric product are discussed miner.pdf More Documents & Publications Skutterudite Thermoelectric Generator For Automotive...
Sets and Constraint Logic Programming Agostino Dovier
Rossi, Gianfranco
are embedded in a Constraint Logic Programming (CLP) language which provides #12;nite sets|along with basic set by programming in CLP(SET ). Categories and Subject Descriptors: D.3.2 [Programming Languages]: Constraint and Logic Languages; D.3.3 [Programming Languages]: Language Constructs and Features; F.4 [Math- ematical
Constraint Logic Programming Overview of CP
Qu, Rong
G53CLP Constraint Logic Programming Overview of CP Dr Rong Qu #12;G53CLP Constraint Logic Programming Dr. R Qu 2 Computer Programs a collection of source code and libraries which have been compiled and interactive tasks with data. - Wikipedia #12;3 Programming Paradigms Procedural Sequences of instructions
Export Growth and Credit Constraints Tibor Besedes
Das, Suman
Export Growth and Credit Constraints Tibor Besedes Byung-Cheol Kim Volodymyr Lugovskyy§ May 14, 2014 Abstract We investigate the effect of credit constraints on the growth of exports at the micro of exporting, but not in later stages. Our empirical results using product level data on exports to twelve
The Balance Constraint Family Christian Bessiere1
Walsh, Toby
The Balance Constraint Family Christian Bessiere1 , Emmanuel Hebrard2 , George Katsirelos3 , Zeynep NICTA and University of New South Wales, email: toby.walsh@nicta.com.au Abstract. The BALANCE constraint introduced by Beldiceanu ensures solutions are balanced. This is useful when, for example
Removing Propagation Redundant Constraints in Redundant Modeling
Stuckey, Peter J.
propagation redundant constraints in redundant modeling can speed up search by several order of magnitudes but not least, the choice of variables and the associated domains should lead to a smaller search space than search with various degrees of constraint propagation for pruning the search space. One common technique
Fourth generation quark mass limits in CKM-element space
Christian J. Flacco; Daniel Whiteson; Matthew Kelly
2011-01-25T23:59:59.000Z
We present a reanalysis of CDF data to extend limits on individual fourth-generation quark masses from particular flavor-mixing rates to the entire space of possible mixing values. Measurements from CDF have set individual limits on masses, $m_{b'}$ and $m_{t'}$, at the level of $335$--$385$ GeV assuming specific and favorable flavor-mixing rates. We consider the space of possible values for the mixing rates and find that the CDF data imply limits of $290$ GeV and greater over a wide range of mixing scenarios. We also analyze the limits from the perspective of a four-generation CKM matrix. We find that present experimental constraints on CKM elements do not suggest further constraints on fourth-generation quark masses.
Solar System Constraints on Disformal Gravity Theories
Hiu Yan Ip; Jeremy Sakstein; Fabian Schmidt
2015-07-02T23:59:59.000Z
Disformal theories of gravity are scalar-tensor theories where the scalar couples derivatively to matter via the Jordan frame metric. These models have recently attracted interest in the cosmological context since they admit accelerating solutions. We derive the solution for a static isolated mass in generic disformal gravity theories and transform it into the parameterised post-Newtonian form. This allows us to investigate constraints placed on such theories by local tests of gravity. The tightest constraints come from preferred-frame effects due to the motion of the Solar System with respect to the evolving cosmological background field. The constraints we obtain improve upon the previous solar system constraints by two orders of magnitude, and constrain the scale of the disformal coupling for generic models to $\\mathcal{M} \\gtrsim 100$ eV. These constraints render all disformal effects irrelevant for cosmology.
Solar System Constraints on Disformal Gravity Theories
Ip, Hiu Yan; Schmidt, Fabian
2015-01-01T23:59:59.000Z
Disformal theories of gravity are scalar-tensor theories where the scalar couples derivatively to matter via the Jordan frame metric. These models have recently attracted interest in the cosmological context since they admit accelerating solutions. We derive the solution for a static isolated mass in generic disformal gravity theories and transform it into the parameterised post-Newtonian form. This allows us to investigate constraints placed on such theories by local tests of gravity. The tightest constraints come from preferred-frame effects due to the motion of the Solar System with respect to the evolving cosmological background field. The constraints we obtain improve upon the previous solar system constraints by two orders of magnitude, and constrain the scale of the disformal coupling for generic models to $\\mathcal{M} \\gtrsim 100$ eV. These constraints render all disformal effects irrelevant for cosmology.
On Systems with Limited Communication A thesis presented
and Applied Sciences in partial fulfillment of the requirements for the degree of Doctor of Philosophy. The traditional assumption which ignores communication constraints doesn't apply to those sys- tems. This thesisOn Systems with Limited Communication A thesis presented by Jian Zou to The Division of Engineering
A geometric approach for early power grid verification using current constraints
Najm, Farid N.
A geometric approach for early power grid verification using current constraints Imad A. Ferzli Automation Eindhoven, The Netherlands lars@magma-da.com ABSTRACT The verification of power grids in modern programs as there are power grid nodes, to an- other involving a user-limited number of solutions of one
Cloud tomography: Role of constraints and a new algorithm Dong Huang,1
Cloud tomography: Role of constraints and a new algorithm Dong Huang,1 Yangang Liu,1 and Warren 2008. [1] Retrieving spatial distributions of cloud liquid water content from limited-angle emission data (passive microwave cloud tomography) is ill-posed, and a small inaccuracy in the data and
The Speed Bounds on Event Reporting in Mobile Sensor Networks with Energy Constraints
Wang, Wenye
The Speed Bounds on Event Reporting in Mobile Sensor Networks with Energy Constraints Yi Xu network response delay. However, due to the sensor mobility and the energy limitation, fast report and Wenye Wang Department of Electrical and Computer Engineering North Carolina State University Raleigh, NC
but also a strategy for ensuring energy balance before digestive capacity is reached. 3. Foraging time of British Columbia, Canada; 2 University of St. Andrew's, UK, 3 Texas A&M University, Galveston, USA the physiological constraint of aerobic dive limits defines their strategies. However, there are other physiological
Video Distribution Under Multiple Constraints Boaz Patt-Shamir Dror Rawitz
Lynch, Nancy
may have other limited resources: for example, a client typically has a maximal incoming bandwidth will provide, and out of this set, which streams each client will receive. The goal is to maximize the overall only a bound on their maximal utility. If, in addition, each client has at most mc capacity constraints
Pockman, William T.
Summary We investigated hydraulic constraints on water uptake by velvet mesquite (Prosopis velutina for transpiration. Regardless of rooting depth, hydraulic limitations to water uptake and transport play an important role in the regulation of transpiration. Limitations imposed by soil and plant hydraulic
Analyze Constraint Behavior to Discover Hidden Value in your Process
Morrison, R.; Moore, D.
2004-01-01T23:59:59.000Z
of data to the database. Several EMS Reports are generated daily by the MSAccess application. These include: Power Boiler Control Constraints 4200 kPa Header Optimizer Constraints 1150 kPa Header Optimization Constraints 450 kPa Header...
New limits for neutrinoless tau decays
Ammar, Raymond G.; Baringer, Philip S.; Bean, Alice; Besson, David Zeke; Coppage, Don; Darling, C.; Davis, Robin E. P.; Kotov, S.; Kravchenko, I.; Kwak, Nowhan; Zhou, L.
1998-05-01T23:59:59.000Z
double beta decays, neutrino oscillations, Z!l11l22 decays, and other rare pro- cesses. In particular, there are strict limits on muon neutrino- less decays: B(m!eg),4.9310211 and B(m!eee),2.4 310212 at 90% confidence level @18#. However, lepton num- ber... particles and on the new coupling constants. The most optimistic branching fraction predictions are at the level of about 1026. Constraints on lepton flavor violation come from studies of rare and forbidden K , p, and m decays, e-m conversions, neutrinoless...
A Constraint-Reduced Algorithm for Semidefinite Optimization ...
2015-05-23T23:59:59.000Z
May 23, 2015 ... Constraint reduction methods originated from the question of whether we can save computational costs by ignoring a subset of constraints ...
Constraint of DNA on Functionalized Graphene Improves Its Biostability...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Constraint of DNA on Functionalized Graphene Improves Its Biostability and Specificity. Constraint of DNA on Functionalized Graphene Improves Its Biostability and Specificity....
CMB constraints on the fine structure constant
Kazuhide Ichikawa; Toru Kanzaki; Masahiro Kawasaki
2006-05-25T23:59:59.000Z
We study constraints on time variation of the fine structure constant alpha from cosmic microwave background (CMB) taking into account simultaneous change in alpha and the electron mass m_e which might be implied in unification theories. We obtain the constraints -0.097 < Delta alpha/alpha < 0.034 at 95% C.L. using WMAP data only, and -0.042 < Delta alpha/alpha < 0.026 combining with the constraint on the Hubble parameter by the HST Hubble Key Project. These are improved by 15% compared with constraints assuming only alpha varies. We discuss other relations between variations in alpha and m_e but we do not find evidence for varying alpha.
Multiple Vehicle Routing Problem with Fuel Constraints
Levy, David
2013-06-26T23:59:59.000Z
In this paper, a Multiple Vehicle Routing Problem with Fuel Constraints (MVRPFC) is considered. This problem consists of a field of targets to be visited, and a collection of vehicles with fuel tanks that may visit the targets. Consideration...
Beta Reduction Constraints Manuel Bodirsky Katrin Erk
Paris-Sud XI, UniversitÃ© de
Beta Reduction Constraints Manuel Bodirsky Katrin Erk Alexander Koller Joachim Niehren Programming Systems Lab Dept. of Computational Linguistics UniversitÂ¨at des Saarlandes, SaarbrÂ¨ucken, Germany www.ps.uni-sb.de/~{bodirsky,erk
Synthetic approaches to understanding biological constraints
Velenich, Andrea
Microbes can be readily cultured and their genomes can be easily manipulated. For these reasons, laboratory systems of unicellular organisms are increasingly used to develop and test theories about biological constraints, ...
Multiple Vehicle Routing Problem with Fuel Constraints
Levy, David
2013-06-26T23:59:59.000Z
In this paper, a Multiple Vehicle Routing Problem with Fuel Constraints (MVRPFC) is considered. This problem consists of a field of targets to be visited, and a collection of vehicles with fuel tanks that may visit the targets. Consideration...
Urban Parks: Constraints on Park Visitation
Scott, David
2006-12-19T23:59:59.000Z
Research shows that women, older people, members of some ethnic groups, and people with low educational and income levels are less likely than others to participate in leisure activities or visit parks. This publication explores the constraints...
Geophysical constraint on a relic background of the dilatons
Sachie Shiomi
2010-10-15T23:59:59.000Z
According to a scenario in string cosmology, a relic background of light dilatons can be a significant component of the dark matter in the Universe. A new approach of searching for such a dilatonic background by observing Earth's surface gravity was proposed in my previous work. In this paper, the concept of the geophysical search is briefly reviewed, and the geophysical constraint on the dilaton background is presented as a function of the strength of the dilaton coupling, $q_b^2$. For simplicity, I focus on massless dilatons and assume a simple Earth model. With the current upper limit on $q_b^2$, we obtain the upper limit on the dimensionless energy density of the massless background, $\\Omega_{DW}h^2_{100} \\leq 6 \\times 10^{-7}$, which is about one-order of magnitude more stringent than the one from astrophysical observations, at the frequency of $\\sim$ 7 $\\times$ 10$^{-5}$ Hz. If the magnitude of $q_b^2$ is experimentally found to be smaller than the current upper limit by one order of magnitude, the geophysical upper limit on $\\Omega_{DW}h^2_{100}$ becomes less stringent and comparable to the one obtained from the astrophysical observations.
National Nuclear Security Administration (NNSA)
Detection System (USNDS), which monitors compliance with the international Limited Test Ban Treaty (LTBT). The LTBT, signed by 108 countries, prohibits nuclear testing in the...
Projected Constraints on Lorentz-Violating Gravity with Gravitational Waves
Devin Hansen; Nicolas Yunes; Kent Yagi
2014-12-12T23:59:59.000Z
Gravitational waves are excellent tools to probe the foundations of General Relativity in the strongly dynamical and non-linear regime. One such foundation is Lorentz symmetry, which can be broken in the gravitational sector by the existence of a preferred time direction, and thus, a preferred frame at each spacetime point. This leads to a modification in the orbital decay rate of binary systems, and also in the generation and chirping of their associated gravitational waves. We here study whether waves emitted in the late, quasi-circular inspiral of non-spinning, neutron star binaries can place competitive constraints on two proxies of gravitational Lorentz-violation: Einstein-\\AE{}ther theory and khronometric gravity. We model the waves in the small-coupling (or decoupling) limit and in the post-Newtonian approximation, by perturbatively solving the field equations in small deformations from General Relativity and in the small-velocity/weak-gravity approximation. We assume a gravitational wave consistent with General Relativity has been detected with second- and third-generation, ground-based detectors, and with the proposed space-based mission, DECIGO, with and without coincident electromagnetic counterparts. Without a counterpart, a detection consistent with General Relativity of neutron star binaries can only place competitive constraints on gravitational Lorentz violation when using future, third-generation or space-based instruments. On the other hand, a single counterpart is enough to place constraints that are 10 orders of magnitude more stringent than current binary pulsar bounds, even when using second-generation detectors. This is because Lorentz violation forces the group velocity of gravitational waves to be different from that of light, and this difference can be very accurately constrained with coincident observations.
Topological Constraints in Directed Polymer Melts
Serna, Pablo; Nahum, Adam
2015-01-01T23:59:59.000Z
Polymers in a melt may be subject to topological constraints, as in the example of unlinked polymer rings. How to do statistical mechanics in the presence of such constraints remains a fundamental open problem. We study the effect of topological constraints on a melt of directed polymers using simulations of a simple quasi-2D model. We find that fixing the global topology of the melt to be trivial changes the polymer conformations drastically. Polymers of length $L$ wander in the transverse direction only by a distance of order $(\\ln L)^\\zeta$ with $\\zeta \\simeq 1.5$. This is strongly suppressed in comparison with the Brownian scaling $L^{1/2}$ which holds in the absence of the topological constraint. It is also much less than the prediction $L^{1/4}$ of a mean-field-like `array of obstacles' model: thus we rule out such a model in the present setting. Dynamics are also strongly affected by the constraints, and a tagged monomer in an infinite system performs logarithmically slow subdiffusion. To cast light on...
Constraints on Supersymmetric Models from Catalytic Primordial Nucleosynthesis of Beryllium
Maxim Pospelov; Josef Pradler; Frank Daniel Steffen
2008-10-27T23:59:59.000Z
The catalysis of nuclear reactions by negatively charged relics leads to increased outputs of primordial ^6Li and ^9Be. In combination with observational constraints on the primordial fractions of ^6Li and ^9Be, this imposes strong restrictions on the primordial abundance and the lifetime of charged relics. We analyze the constraints from the catalysis of ^9Be on supersymmetric models in which the gravitino is the lightest supersymmetric particle and a charged slepton--such as the lighter stau--the next-to-lightest supersymmetric particle (NLSP). Barring the special cases in which the primordial fraction of the slepton NLSP is significantly depleted, we find that the ^9Be data require a slepton NLSP lifetime of less than 6x10^3 seconds. We also address the issue of the catalytic destruction of ^6Li and ^9Be by late forming bound states of protons with negatively charged relics finding that it does not lead to any significant modification of the limit on the slepton lifetime.
Electromagnetic field with constraints and Papapetrou equation
Z. Ya. Turakulov; A. T. Muminov
2006-01-12T23:59:59.000Z
It is shown that geometric optical description of electromagnetic wave with account of its polarization in curved space-time can be obtained straightforwardly from the classical variational principle for electromagnetic field. For this end the entire functional space of electromagnetic fields must be reduced to its subspace of locally plane monochromatic waves. We have formulated the constraints under which the entire functional space of electromagnetic fields reduces to its subspace of locally plane monochromatic waves. These constraints introduce variables of another kind which specify a field of local frames associated to the wave and contain some congruence of null-curves. The Lagrangian for constrained electromagnetic field contains variables of two kinds, namely, a congruence of null-curves and the field itself. This yields two kinds of Euler-Lagrange equations. Equations of first kind are trivial due to the constraints imposed. Variation of the curves yields the Papapetrou equations for a classical massless particle with helicity 1.
On kinematical constraints in Regge calculus
V. Khatsymovsky
1993-11-04T23:59:59.000Z
In the (3+1)D Hamiltonian Regge calculus (one of the coordinates, $ t$, is continuous) conjugate variables are (defined on triangles of discrete 3D section $ t=const$) finite connections and antisymmetric area bivectors. The latter, however, are not independent, since triangles may have common edges. This circumstance can be taken into account with the help of the set of kinematical (that is, required to hold by definition of Regge manifold) bilinear constraints on bivectors. Some of these contain derivatives over $ t$, and taking them into account with the help of Lagrange multipliers would result in the new dynamical variables not having analogs in the continuum theory. It is shown that kinematical constraints with derivatives are consequences of eqs. of motion for Regge action supplemented with the rest of these constraints without derivatives and can be omitted; so the new dynamical variables do not appear.
First class constraints in Regge calculus
V. Khatsymovsky
1993-11-08T23:59:59.000Z
Considered are I class constraints in the tetrad-connection formulation of Regge calculus. One of these is well-known Gauss law which generates rotations in the local frames associated with tetrahedrons in the continuous time 3D section. Another two types of these are new, satisfied by definition of Regge manifold and having no I class analogs in the continuum general relativity. Constraints of the first type express vanishing of the dual squares of antisymmetric tensors of the triangles in the 3D section thus ensuring each such tensor being a bivector. Constraints of the second type are trigonometric relations between areas of triangles of 3D section caused by that the set of areas is redundant as compared to the set of linklengts.
Relaxation of the lower frit loading constraint for DWPF process control
Brown, K.G.
2000-03-01T23:59:59.000Z
The lower limit on the frit loading parameter when measurement uncertainty is introduced has impacted DWPF performance during immobilization of Tank 42 Sludge; therefore, any defensible relaxation or omission of this constraint should correspondingly increase DWPF waste loading and efficiency. Waste loading should be increased because the addition of frit is the current remedy for exceeding the lower frit loading constraint. For example, frit was added to DWPF SME Batches 94, 97 and 98 to remedy these batches for low frit loading. Attempts were also made to add frit in addition to the optimum computed to assure the lower frit loading constraint would be satisfied; however, approximately half of the SME Batches produced after Batch 98 have violated the lower frit loading constraint. If the DWPF batches did not have to be remediated and additional frit added because of the lower frit loading limit, then both, the performance of the DWPF process and the waste loading in the glass produced would be increased. Before determining whether or not the lower frit loading limit can be relaxed or omitted, the origin of this and the other constraints related to durability prediction must be examined. The lower limit loading constraint results from the need to make highly durable glass in DWPF. It is required that DWPF demonstrate that the glass produced would have durability that is at least two standard deviations greater than that of the Environmental Assessment (EA) glass. Glass durability cannot be measured in situ, it must be predicted from composition which can be measured. Fortunately, the leaching characteristics of homogeneous waste glasses is strongly related to the total molar free energy of the constituent species. Thus the waste acceptance specification has been translated into a requirement that the total molar free energy associated with the glass composition that would be produced from a DWPF melter feed batch be less than that of the EA glass accounting for both prediction uncertainty (including bias) and measurement uncertainty to a confidence level of 95%. However, it was discovered during Integrated DWPF Melter System (IDMS) testing that under certain conditions, DWPF glasses were prone to phase separation resulting in glasses that had noticeably unpredictable and, at times, unacceptable leaching behavior. This document details an evaluation of the continued applicability of the low frit constraint for DWPF Slurry Mix Evaporator (SME) acceptability determinations.
Relaxed constraints on neutrino oscillation parameters
Daniela P. Kirilova; Mariana P. Panayotova
2006-08-04T23:59:59.000Z
We study the cosmological constraints on active-sterile neutrino oscillations nu_e nu_s for the case when nu_s is partially filled initially, i.e. 0 nu_s oscillations, effective after neutrino decoupling, accounting for all known oscillations effects on cosmological nucleosynthesis. Cosmological constraints on oscillation parameters corresponding to higher than 5% He-4 overproduction and different non-zero initial populations of the sterile state delta N_s 0 are relaxed in comparison with the delta N_s = 0 case and the relaxation is proportional to delta N_s.
New. nu. constraints on Majorana mass matrices
Dugan, M.J.; Manohar, A.; Nelson, A.E.
1985-07-08T23:59:59.000Z
We discuss constraints on the three by three Majorana neutrino mass matrix consistent with neutrinoless double ..beta.. decay experiments, neutrino oscillation experiments, and the existence of a 17-keV neutrino. We find that ..nu../sub ..mu../ and ..nu../sub tau/ must be nearly degenerate, or ..nu../sub ..mu../ must be heavier than 250 keV. A new parametrization of the mixing in the neutrino sector is proposed. We give a simple example of a mass matrix which satisfies all constraints.
LHC constraints on gauge boson couplings to dark matter
Crivellin, Andreas; Hibbs, Anthony
2015-01-01T23:59:59.000Z
Collider searches for energetic particles recoiling against missing transverse energy allow to place strong bounds on the interactions between dark matter (DM) and standard model particles. In this article we update and extend LHC constraints on effective dimension-7 operators involving DM and electroweak gauge bosons. A concise comparison of the sensitivity of the mono-photon, mono-W, mono-Z, mono-W/Z, invisible Higgs-boson decays in the vector boson fusion mode and the mono-jet channel is presented. Depending on the parameter choices, either the mono-photon or the mono-jet data provide the most stringent bounds at the moment. We furthermore explore the potential of improving the current 8 TeV limits at 14 TeV. Future strategies capable of disentangling the effects of the different effective operators involving electroweak gauge bosons are discussed as well.
Independent Sets in Regular Hypergraphs and Multi-Dimensional Runlength-Limited Constraints
Roth, Ronny
in VG let NG(v) denote the set of vertices that are adjacent to v in G, namely, NG(v) = n v0 2 VG nfvg
Title 10 USC 2684a Agreements to Limit Encroachments and Other Constraints
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page onsource History View New PagessourceRavenandEconomiesEnergy Information Time-DomainformTitle 10 ChapterDefenseon
Thomas M. Stace
2010-06-08T23:59:59.000Z
The precision of typical thermometers consisting of $N$ particles is shot noise limited, improving as $\\sim1/\\sqrt{N}$. For high precision thermometry and thermometric standards this presents an important theoretical noise floor. Here it is demonstrated that thermometry may be mapped onto the problem of phase estimation, and using techniques from optimal phase estimation, it follows that the scaling of the precision of a thermometer may in principle be improved to $\\sim1/N$, representing a Heisenberg limit to thermometry.
Chiral Ring of Strange Metals: The Multicolor Limit
Mikhail Isachenkov; Ingo Kirsch; Volker Schomerus
2014-10-16T23:59:59.000Z
The low energy limit of a dense 2D adjoint QCD is described by a family of ${\\cal N}=(2,2)$ supersymmetric coset conformal field theories. In previous work we constructed chiral primaries for a small number $N primaries are labeled by partitions and identify the ring they generate as the ring of Schur polynomials. Our findings impose strong constraints on the possible dual description through string theory in an $AdS_3$ compactification.
Design Constraints for Liquid-Protected Divertors
limits for Plasma impurities and Power Cycle efficiency requirements · This work is aimed at establishing
Kalman Filtering with State Equality Constraints
Simon, Dan
Kalman Filtering with State Equality Constraints DAN SIMON, Member, IEEE Cleveland State University TIEN LI CHIA, Member, IEEE ControlSoft, Inc. Kalman filters are commonly used to estimate the states of a dynamic system. However, in the application of Kalman filters there is often known model or signal
KALMAN FILTERING WITH STATISTICAL STATE CONSTRAINTS
Simon, Dan
KALMAN FILTERING WITH STATISTICAL STATE CONSTRAINTS T. L. Chia ControlSoft Inc. 5387 Avion Park with white process and measurement noise, the Kalman ¯lter is known to be the minimum variance linear state estimator. In the case that the random quantities are Gaussian, then the Kalman ¯lter is the minimim
Transforming and Refining Abstract Constraint Specifications
Walsh, Toby
Transforming and Refining Abstract Constraint Specifications Alan M. Frisch1 , Brahim Hnich2 , Ian choose model transformations to reduce greatly the amount of effort that is required to solve a problem by systematic search. It is a consid- erable challenge to automate such transformations. A problem may be viewed
Negative Boolean Constraints \\Lambda Kim Marriott
Odersky, Martin
with a single inequation to be lifted to systems with many inequations. 1 Introduction Since Boole [2], systems (or conjunctions) of positive constraints f ` g over a Boolean algebra have been extensively studied been widely studied in their own right. This may be because in the case of twoÂvalued Boolean algebras
Constraint Logic Programming Marco Gavanelli1
Rossi, Francesca
Constraint Logic Programming Marco Gavanelli1 and Francesca Rossi2 1 Dipartimento di Ingegneria Logic Programming (CLP) is one of the most successful branches of Logic Programming; it attracts either as open source programs or as commercial systems. Also, CLP has been one of the technologies able
Environmental Constraints Management in Digital Right Licences
Paris-Sud XI, Université de
solutions. Keywords: Environmental Constraints, Certifications, Digital Right Management, Licences on licences, which define who is able to do what on what under which circumstances. Among them, MPEG-REL [ISO: the environment. Many organizations tend to pass certifications with respect to governmental laws such as Sarbanes
Constraint satisfaction and global optimization in robotics
Neumaier, Arnold
Constraint satisfaction and global optimization in robotics Arnold Neumaier UniversitÂ¨at Wien and Jean-Pierre Merlet INRIA Sophia Antipolis 1 #12;The design, validation, and use of robots poses a num they are going to do. Soon they will be able to do anything they want!" Genesis 11:6. 3 #12;A robot is a machine
Constraint-based Computing ENABLES BETTER DECISIONS
Foley, Simon
retail industry. Whether an ERI company is involved in manufacturing, workforce management, product. For example, with additional funding from Enterprise Ireland and Bausch & Lomb, we worked with eye health product provider Bausch & Lomb utilizing constraint-based technology to analyze design and manufacturing
Processor Speed Control with Thermal Constraints
Almir Mutapcic
2007-09-29T23:59:59.000Z
Sep 29, 2007 ... Processor Speed Control with Thermal Constraints ... and we model the dissipated power of a processor as a positive and strictly increasing ... speeds based on the measured temperatures in the system. ... Category 2: Applications -- Science and Engineering (Optimization of Systems modeled by PDEs ).
Constraint-Based Planning and Scheduling Models
Grossmann, Ignacio E.
and Logistics Laboratory Adaptive traffic signal control [Traffic21, Heinz] The Robotics Institute, CarnegieConstraint-Based Planning and Scheduling Models Stephen F. Smith The Robotics Institute Carnegie Multi-Robot Coordination for Aircraft Assembly [Boeing] - Distributed management of joint plans
Backtracking in Distributed Constraint Networks Youssef Hamadi
Hamadi, Yousseff
). The basic method to search for solu- tion in a constraint network is backtrack search, which performs a systematic exploration of the search tree until it finds an instantiation of values to variables search algorithms among several agents to speed up the running time of central algorithms. We distribute
Precision Constraints on Extra Fermion Generations
Jens Erler; Paul Langacker
2010-07-27T23:59:59.000Z
There has been renewed interest in the possibility of additional fermion generations. At the same time there have been significant changes in the relevant electroweak precision constraints, in particular, in the interpretation of several of the low energy experiments. We summarize the various motivations for extra families and analyze them in view of the latest electroweak precision data.
SCHEDULING CEMENT PLANTS WITH ENERGY CONSTRAINTS
Grossmann, Ignacio E.
SCHEDULING CEMENT PLANTS WITH ENERGY CONSTRAINTS Pedro M. Castro Ignacio E. Grossmann Iiro K Meeting 4 #12;5 ABB PROJECT #12;INTRODUCTION Cement producers currently under pressure to produce Contracts agreed between electricity supplier and cement plants (planning level) Energy cost [$/k
Modular Lazy Search for Constraint Satisfaction Problems
Tolmach, Andrew
graph coloring #12;3 CSP Algorithm Zoo · No agreedupon common framework. · Many problems benefit from on this function is a constraint check · Problem: type CSP = CSP{vars::Int,vals::Int,rel::Rel} #12;7 States is complete. complete :: CSP -> State -> Bool complete CSP{vars} as = (length as == vars) · A state
Protein flexibility and dynamics using constraint theory
Jacobs, Donald J.
place, consistent with these distance constraints. We also define a flexibility index that quantifies the local density of flexible or floppy modes, in terms of the dihedral angles that remain free to rotate of the flexible regions by introducing Monte Carlo changes in the free dihedral angles, subject to the distance
The SLIDE Meta-Constraint Christian Bessiere
Walsh, Toby
to propagate SLIDE. Our experiments demonstrate that using SLIDE to encode constraints can be just as efficient.g. only 1 out of 3 cars can have the sun-roof option). As a second example, in a nurse rostering problems, propagating our encoding is as efficient and as effective as a specialized propagator. 2 Background
Synthesised Constraint Models for Distributed Energy Management
Reif, Wolfgang
, be it the coordination of power generation [1], demand-side management, or building control software. In a producerPreprintO nly Synthesised Constraint Models for Distributed Energy Management Alexander--Resource allocation is a task frequently encountered in energy management systems such as the coordination of power
ORIGINAL ARTICLE Hexahedral mesh generation constraints
Utah, University of
ORIGINAL ARTICLE Hexahedral mesh generation constraints Jason F. Shepherd Æ Chris R. Johnson element counts, and improved reliability. However, hexahedral finite element mesh generation continues to be difficult to perform and automate, with hexahedral mesh generation taking several orders of magnitude longer
NUMERICAL CONSTRAINTS FOR EMBEDDED PROJECTIVE MANIFOLDS
Besana, Gian Mario
an n- fold X in P2n is related to the number of double points of a generic projection of X from P2n+1. Double point formulas, expressing these constraints in terms of Chern classes of the manifolds and its case of the Laksov-Todd double point formula, [37]. An excellent general reference is due to Kleiman
Constraints on decaying dark matter from Fermi observations of nearby galaxies and clusters
Dugger, Leanna; Profumo, Stefano [Department of Astronomy and Department of Physics, University of California Berkeley, 601 Campbell Hall, Berkeley, CA (United States); Jeltema, Tesla E., E-mail: greentee01@gmail.com, E-mail: tesla@ucolick.org, E-mail: profumo@scipp.ucsc.edu [UCO/Lick Observatories, 1156 High St., Santa Cruz, CA 95064 (United States)
2010-12-01T23:59:59.000Z
We analyze the impact of Fermi gamma-ray observations (primarily non-detections) of selected nearby galaxies, including dwarf spheroidals, and of clusters of galaxies on decaying dark matter models. We show that the fact that galaxy clusters do not shine in gamma rays puts the most stringent limits available to-date on the lifetime of dark matter particles for a wide range of particle masses and decay final states. In particular, our results put strong constraints on the possibility of ascribing to decaying dark matter both the increasing positron fraction reported by PAMELA and the high-energy feature in the electron-positron spectrum measured by Fermi. Observations of nearby dwarf galaxies and of the Andromeda Galaxy (M31) do not provide as strong limits as those from galaxy clusters, while still improving on previous constraints in some cases.
Magnetic and Electric Dipole Constraints on Extra Dimensions and Magnetic Fluxes
Aaron J. Roy; Myron Bander
2008-05-10T23:59:59.000Z
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.
Constraints on Covariant Horava-Lifshitz Gravity from frame-dragging experiment
Ninfa Radicella; Gaetano Lambiase; Luca Parisi; Gaetano Vilasi
2014-08-06T23:59:59.000Z
The effects of Horava-Lifshitz corrections to the gravito-magnetic field are analyzed. Solutions in the weak field, slow motion limit, referring to the motion of a satellite around the Earth are considered. The post-newtonian paradigm is used to evaluate constraints on the Horava-Lifshitz parameter space from current satellite and terrestrial experiments data. In particular, we focus on GRAVITY PROBE B, LAGEOS and the more recent LARES mission, as well as a forthcoming terrestrial project, GINGER.
Dynamic Flexible Constraint Satisfaction and it's Application to AI Planning
Miguel, Ian
Constraints are a natural means of knowledage representation in many disparate fields. A constraint often takes the form of an equation or inequality, but in the most abstract senseis simply a logical relation among several ...
A Novel Method for Learning Policies from Variable Constraint Data
Howard, Matthew; Klanke, Stefan; Gienger, Michael; Goerick, Christian; Vijayakumar, Sethu
2009-01-01T23:59:59.000Z
Many everyday human skills can be framed in terms of performing some task subject to constraints imposed by the environment. Constraints are usually unobservable and frequently change between contexts. In this paper, we ...
McBranch, D.W.; Mattes, B.R.; Koskelo, A.C.; Heeger, A.J.; Robinson, J.M.; Smilowitz, L.B.; Klimov, V.I.; Cha, M.; Sariciftci, N.S.; Hummelen, J.C.
1998-04-21T23:59:59.000Z
Methanofullerenes, fulleroids and/or other fullerenes chemically altered for enhanced solubility, in liquid solution, and in solid blends with transparent glass (SiO{sub 2}) gels or polymers, or semiconducting (conjugated) polymers, are shown to be useful as optical limiters (optical surge protectors). The nonlinear absorption is tunable such that the energy transmitted through such blends saturates at high input energy per pulse over a wide range of wavelengths from 400--1,100 nm by selecting the host material for its absorption wavelength and ability to transfer the absorbed energy into the optical limiting composition dissolved therein. This phenomenon should be generalizable to other compositions than substituted fullerenes. 5 figs.
Summers, Melissa Erin
2012-01-01T23:59:59.000Z
3 Integral Quadratic Constraints 3.1Independent Verification of Integral Quadratic Constraints3.6 Invariants of Integral Quadratic Constraints . . 4
A Method for Comparing Soft Constraint CWI ? & ILLC
Rossi, Francesca
, fuzzy, partial and c-semiring-based frameworks. Example 1. Consider the universal algebra Bool which Algebraic Structures for Soft Constraint Frameworks 2.1 Constraint universal algebras. If we abstract constraints is: a #12;nite set of variables; a #12;nite variable domain; an algebraic structure, brie y a set
OPTIMAL CONTROL OF LINEAR SYSTEMS WITH STATE EQUALITY CONSTRAINTS
Bitmead, Bob
, a number of modern model-based control design methods sought to deal with system constraints directlyOPTIMAL CONTROL OF LINEAR SYSTEMS WITH STATE EQUALITY CONSTRAINTS Sangho Ko , Robert R. Bitmead 1 with the optimal control problem for systems with state linear equality constraints. For deterministic linear
Implementing Temporal Integrity Constraints Using an Active DBMS
Toman, David
Implementing Temporal Integrity Constraints Using an Active DBMS David Toman Jan Chomicki constraints formu lated in past temporal logic into rules of the Starburst DBMS. During the compilation Logic; the constraint checking can then be done with out referring to the whole past history
Polymer constraint effect for electrothermal bimorph microactuators T. Chu Duca
Technische Universiteit Delft
Polymer constraint effect for electrothermal bimorph microactuators T. Chu Duca Laboratory report on the analysis of the polymer constraint effect and its use for a micromachined electrothermal bimorph actuator. The actuated displacement is enhanced due to the polymer constraint effect. Both
Solar System constraints to nonminimally coupled gravity
Orfeu Bertolami; Riccardo March; Jorge Páramos
2013-06-05T23:59:59.000Z
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.
Effective Hamiltonian Constraint from Group Field Theory
Etera R. Livine; Daniele Oriti; James P. Ryan
2011-04-28T23:59:59.000Z
Spinfoam models provide a covariant formulation of the dynamics of loop quantum gravity. They are non-perturbatively defined in the group field theory (GFT) framework: the GFT partition function defines the sum of spinfoam transition amplitudes over all possible (discretized) geometries and topologies. The issue remains, however, of explicitly relating the specific form of the group field theory action and the canonical Hamiltonian constraint. Here, we suggest an avenue for addressing this issue. Our strategy is to expand group field theories around non-trivial classical solutions and to interpret the induced quadratic kinematical term as defining a Hamiltonian constraint on the group field and thus on spin network wave functions. We apply our procedure to Boulatov group field theory for 3d Riemannian gravity. Finally, we discuss the relevance of understanding the spectrum of this Hamiltonian operator for the renormalization of group field theories.
Stellar properties and nuclear matter constraints
Dutra, Mariana; Menezes, Débora P
2015-01-01T23:59:59.000Z
We have analyzed stellar properties of the relativistic mean-field (RMF) parametrizations shown to be consistent with the recently studied constraints related to nuclear matter, pure neutron matter, symmetry energy and its derivatives [Dutra et al., Phys. Rev. C 90, 055203 (2014)]. Our results show that only two RMF parametrizations do not allow the emergence of the direct Urca process, important aspect regarding the evolution of a neutron star. Moreover, among all approved RMF models, fourteen of them produce neutron stars with maximum masses inside the range $1.93\\leqslant M/M_\\odot\\leqslant 2.05$, with $M_\\odot$ being the solar mass. Only three models yield maximum masses above this range and a discussion on the inclusion of hyperons is presented. Finally, we have verified that the models satisfying the neutron star maximum mass constraint do not observe the squared sound velocity bound, namely, $v_s^2 < 1/3$, corroborating recent findings.
Constraints on New Gravitylike Forces in the Nanometer Range
Kamiya, Y; Tani, M; Kim, G N; Komamiya, S
2015-01-01T23:59:59.000Z
We report on a new constraint on gravitylike short-range forces, in which the interaction charge is mass, obtained by measuring the angular distribution of 5 A neutrons scattering off atomic xenon gas. Around 10^7 scattering events were collected at the 40 m small angle neutron scattering beam line located at the HANARO research reactor of the Korean Atomic Energy Research Institute. The extracted coupling strengths of new forces in the Yukawa-type parametrization are g^2 = (0.2 \\pm 6.8 \\pm 2.0) \\times 10^-15 GeV^2 and g^2 = (-5.3 \\pm 9.0 + 2.7 -2.8) \\times 10^-17 GeV^2 for interaction ranges of 0.1 and 1.0 nm, respectively. These strengths correspond to 95% confidence level limits of g^2 < (1.4 \\pm 0.2) \\times 10^-14 GeV^-2 and g^2 < (1.3 \\pm 0.2) \\times 10^-16 GeV^-2, improving the current limits for interaction ranges between 4 and 0.04 nm by a factor of up to 10.
Constraints on New Gravitylike Forces in the Nanometer Range
Y. Kamiya; K. Itagami; M. Tani; G. N. Kim; S. Komamiya
2015-04-09T23:59:59.000Z
We report on a new constraint on gravitylike short-range forces, in which the interaction charge is mass, obtained by measuring the angular distribution of 5 A neutrons scattering off atomic xenon gas. Around 10^7 scattering events were collected at the 40 m small angle neutron scattering beam line located at the HANARO research reactor of the Korean Atomic Energy Research Institute. The extracted coupling strengths of new forces in the Yukawa-type parametrization are g^2 = (0.2 \\pm 6.8 \\pm 2.0) \\times 10^-15 GeV^2 and g^2 = (-5.3 \\pm 9.0 + 2.7 -2.8) \\times 10^-17 GeV^2 for interaction ranges of 0.1 and 1.0 nm, respectively. These strengths correspond to 95% confidence level limits of g^2 < (1.4 \\pm 0.2) \\times 10^-14 GeV^-2 and g^2 < (1.3 \\pm 0.2) \\times 10^-16 GeV^-2, improving the current limits for interaction ranges between 4 and 0.04 nm by a factor of up to 10.
Constraints to cosmological parameters through clusters evolution
A. Del Popolo; N. Ercan
2004-04-20T23:59:59.000Z
In this paper, I revisit the constraints obtained by several authors (Reichart et al. 1999; Eke et al. 1998; Henry 2000) on the estimated values of Omegam, n and sigma_8 in the light of recent theoretical developments: 1) new theoretical mass functions (Sheth & Tormen 1999, Sheth, Mo & Tormen 2001, Del Popolo 2002b); 2) a more accurate mass-temperature relation, also determined for arbitrary Omega_m and Omega_Lambda (Del Popolo 2002a).
Solar system constraints on Rindler acceleration
Sante Carloni; Daniel Grumiller; Florian Preis
2011-05-09T23:59:59.000Z
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.
Cosmological Constraints from Galaxy Cluster Velocity Statistics
Suman Bhattacharya; Arthur Kosowsky
2007-04-20T23:59:59.000Z
Future microwave sky surveys will have the sensitivity to detect the kinematic Sunyaev-Zeldovich signal from moving galaxy clusters, thus providing a direct measurement of their line-of-sight peculiar velocity. We show that cluster peculiar velocity statistics applied to foreseeable surveys will put significant constraints on fundamental cosmological parameters. We consider three statistical quantities that can be constructed from a cluster peculiar velocity catalog: the probability density function, the mean pairwise streaming velocity, and the pairwise velocity dispersion. These quantities are applied to an envisioned data set which measures line-of-sight cluster velocities with normal errors of 100 km/s for all clusters with masses larger than $10^{14}$ solar masses over a sky area of up to 5000 square degrees. A simple Fisher matrix analysis of this survey shows that the normalization of the matter power spectrum and the dark energy equation of state can be constrained to better than 10 percent, and the Hubble constant and the primordial power spectrum index can be constrained to a few percent, independent of any other cosmological observations. We also find that the current constraint on the power spectrum normalization can be improved by more than a factor of two using data from a 400 square degree survey and WMAP third-year priors. We also show how the constraints on cosmological parameters changes if cluster velocities are measured with normal errors of 300 km/s.
Flener, Pierre
From Space to Smart Homes: Constraint-Based Planning for Domestic Assistance From Space to Smart 2009 1 / 43 #12;From Space to Smart Homes: Constraint-Based Planning for Domestic Assistance Outline 1 to Smart Homes: Constraint-Based Planning for Domestic Assistance Motivation: Contextualized Proactive
Darmann, Francis Anthony
2013-10-08T23:59:59.000Z
A fault current limiter (FCL) includes a series of high permeability posts for collectively define a core for the FCL. A DC coil, for the purposes of saturating a portion of the high permeability posts, surrounds the complete structure outside of an enclosure in the form of a vessel. The vessel contains a dielectric insulation medium. AC coils, for transporting AC current, are wound on insulating formers and electrically interconnected to each other in a manner such that the senses of the magnetic field produced by each AC coil in the corresponding high permeability core are opposing. There are insulation barriers between phases to improve dielectric withstand properties of the dielectric medium.
(Limiting the greenhouse effect)
Rayner, S.
1991-01-07T23:59:59.000Z
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.
Inflation models, spectral index and observational constraints
Laura Covi
2000-03-30T23:59:59.000Z
We have evaluated the observational constraints on the spectral index $n$, in the context of a $\\Lambda$CDM model. For $n$ scale-independent, as predicted by most models of inflation, present data require $n\\simeq 1.0 \\pm 0.1$ at the 2-$\\sigma$ level. We have also studied the two-parameter scale-dependent spectral index, predicted by running-mass inflation models. Present data allow significant variation of $n$ in this case, within the theoretically preferred region of parameter space.
Constraints on secret neutrino interactions after Planck
Forastieri, Francesco; Natoli, Paolo
2015-01-01T23:59:59.000Z
(Abridged) Neutrino interactions beyond the standard model may affect the cosmological evolution and can be constrained through observations. We consider the possibility that neutrinos possess secret scalar or pseudoscalar interactions mediated by the Nambu-Goldstone boson of a still unknown spontaneously broken global $U(1)$ symmetry, as in, e.g. , Majoron models. In such scenarios, neutrinos still decouple at $T\\simeq 1$ MeV, but become tightly coupled again ('recouple') at later stages of the cosmological evolution. We use available observations of CMB anisotropies, including Planck 2013 and the joint BICEP2/Planck 2015 data, to derive constraints on the quantity $\\gamma_{\
Constraints on secret neutrino interactions after Planck
Francesco Forastieri; Massimiliano Lattanzi; Paolo Natoli
2015-06-03T23:59:59.000Z
(Abridged) Neutrino interactions beyond the standard model may affect the cosmological evolution and can be constrained through observations. We consider the possibility that neutrinos possess secret scalar or pseudoscalar interactions mediated by the Nambu-Goldstone boson of a still unknown spontaneously broken global $U(1)$ symmetry, as in, e.g. , Majoron models. In such scenarios, neutrinos still decouple at $T\\simeq 1$ MeV, but become tightly coupled again ('recouple') at later stages of the cosmological evolution. We use available observations of CMB anisotropies, including Planck 2013 and the joint BICEP2/Planck 2015 data, to derive constraints on the quantity $\\gamma_{\
Karsten Jedamzik
2006-11-10T23:59:59.000Z
Big Bang nucleosynthesis in the presence of decaying relic neutral particles is examined in detail. All non-thermal processes important for the determination of light-element abundance yields of 2H, 3H, 3He, 4He, 6Li, and 7Li are coupled to the thermonuclear fusion reactions to obtain comparatively accurate results. Predicted light-element yields are compared to observationally inferred limits on primordial light-element abundances to infer constraints on the abundances and properties of relic decaying particles with decay times in the interval 0.01 sec < tau < 10^(12) sec. Decaying particles are typically constrained at early times by 4He or 2H, at intermediate times by 6Li, and at large times by the 3He/2H ratio. Constraints are shown for a large number of hadronic branching ratios and decaying particle masses and may be applied to constrain the evolution of the early Universe.
Constraints on the induced gravitational wave background from primordial black holes
Bugaev, Edgar; Klimai, Peter [Institute for Nuclear Research, Russian Academy of Sciences, 60th October Anniversary Prospect 7a, 117312 Moscow (Russian Federation)
2011-04-15T23:59:59.000Z
We perform a consistent calculation of primordial black hole (PBH) mass spectrum and second-order induced gravitational wave (GW) background produced from primordial scalar perturbations in radiation era of the early Universe. It is shown that the maximal amplitudes of the second-order GW spectrum that can be approached without conflicting with the PBH data do not depend significantly on the shape of primordial perturbation spectrum. The constraints on the GW background obtained in previous works are extended to a wider GW frequency range. We discuss the applicability of the currently available pulsar timing limits for obtaining the constraints on scalar power spectrum and PBH abundance and show that they can be used for strongly constraining the PBH number density in the PBH mass range {approx}(0.03-10)M{sub {center_dot}}.
Glass Composition Constraint Recommendations for Use in Life-Cycle Mission Modeling
McCloy, John S.; Vienna, John D.
2010-05-03T23:59:59.000Z
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.
Caldwell, R.R.; Linder, Eric V.
2005-05-24T23:59:59.000Z
We present evidence that the simplest particle-physics scalar-field models of dynamical dark energy can be separated into distinct behaviors based on the acceleration or deceleration of the field as it evolves down its potential towards a zero minimum. We show that these models occupy narrow regions in the phase-plane of w and w', the dark energy equation-of-state and its time-derivative in units of the Hubble time. Restricting an energy scale of the dark energy microphysics limits how closely a scalar field can resemble a cosmological constant. These results, indicating a desired measurement resolution of order \\sigma(w')\\approx (1+w), define firm targets for observational tests of the physics of dark energy.
Mackworth, Alan K.
-binary classic con- straint satisfaction problems (CSPs). Based on the Semiring CSP and Valued CSP frameworks CSP, probabilistic CSP, max CSP, and weighted CSP. This extension is based on an idempotent satisfaction problem (CSP), local consistency can be characterized as deriving new constraints based on local
Far-Infrared ISO Limits on Dust Disks around Millisecond Pulsars
T. J. W. Lazio; J. Fischer; R. S. Foster
2001-09-26T23:59:59.000Z
We report 60 and 90 micron observations of 7 millisecond pulsars with the ISOPHOT instrument and describe our analysis procedures. No pulsars were detected, and typical (3\\sigma) upper limits are 150 mJy. We combine our results with others in the literature and use them to place constraints on the existence of protoplanetary or dust disks around millisecond pulsars.
Quantum reading under a local energy constraint
Gaetana Spedalieri; Cosmo Lupo; Stefano Mancini; Samuel L. Braunstein; Stefano Pirandola
2015-09-03T23:59:59.000Z
Nonclassical states of light play a central role in many quantum information protocols. Their quantum features have been exploited to improve the readout of information from digital memories, modelled as arrays of microscopic beam splitters [S. Pirandola, Phys. Rev. Lett. 106, 090504 (2011)]. In this model of quantum reading, a nonclassical source of light with Einstein-Podolski-Rosen correlations has been proven to retrieve more information than any classical source. In particular, the quantum-classical comparison has been performed under a global energy constraint, i.e., by fixing the mean total number of photons irradiated over each memory cell. In this paper we provide an alternative analysis which is based on a local energy constraint, meaning that we fix the mean number of photons per signal mode irradiated over the memory cell. Under this assumption, we investigate the critical number of signal modes after which a nonclassical source of light is able to beat any classical source irradiating the same number of signals.
Planck constraints on holographic dark energy
Li, Miao; Zhang, Zhenhui [Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing 100190 (China); Li, Xiao-Dong [Korea Institute for Advanced Study, Hoegiro 87, Dongdaemun-Gu, Seoul 130-722 (Korea, Republic of); Ma, Yin-Zhe [Department of Physics and Astronomy, University of British Columbia, Vancouver, V6T 1Z1, BC Canada (Canada); Zhang, Xin, E-mail: mli@itp.ac.cn, E-mail: xiaodongli@kias.re.kr, E-mail: mayinzhe@phas.ubc.ca, E-mail: zhangxin@mail.neu.edu.cn, E-mail: zhangzhh@itp.ac.cn [College of Sciences, Northeastern University, Shenyang 110004 (China)
2013-09-01T23:59:59.000Z
We perform a detailed investigation on the cosmological constraints on the holographic dark energy (HDE) model by using the Plank data. We find that HDE can provide a good fit to the Plank high-l (l ?> 40) temperature power spectrum, while the discrepancy at l ? 20-40 found in the ?CDM model remains unsolved in the HDE model. The Plank data alone can lead to strong and reliable constraint on the HDE parameter c. At the 68% confidence level (CL), we obtain c = 0.508 ± 0.207 with Plank+WP+lensing, favoring the present phantom behavior of HDE at the more than 2? CL. By combining Plank+WP with the external astrophysical data sets, i.e. the BAO measurements from 6dFGS+SDSS DR7(R)+BOSS DR9, the direct Hubble constant measurement result (H{sub 0} = 73.8 ± 2.4 kms{sup ?1}Mpc{sup ?1}) from the HST, the SNLS3 supernovae data set, and Union2.1 supernovae data set, we get the 68% CL constraint results c = 0.484 ± 0.070, 0.474 ± 0.049, 0.594 ± 0.051, and 0.642 ± 0.066, respectively. The constraints can be improved by 2%-15% if we further add the Plank lensing data into the analysis. Compared with the WMAP-9 results, the Plank results reduce the error by 30%-60%, and prefer a phantom-like HDE at higher significant level. We also investigate the tension between different data sets. We find no evident tension when we combine Plank data with BAO and HST. Especially, we find that the strong correlation between ?{sub m}h{sup 3} and dark energy parameters is helpful in relieving the tension between the Plank and HST measurements. The residual value of ?{sup 2}{sub Plank+WP+HST}??{sup 2}{sub Plank+WP} is 7.8 in the ?CDM model, and is reduced to 1.0 or 0.3 if we switch the dark energy to w model or the holographic model. When we introduce supernovae data sets into the analysis, some tension appears. We find that the SNLS3 data set is in tension with all other data sets; for example, for the Plank+WP, WMAP-9 and BAO+HST, the corresponding ??{sup 2} is equal to 6.4, 3.5 and 4.1, respectively. As a comparison, the Union2.1 data set is consistent with these three data sets, but the combination Union2.1+BAO+HST is in tension with Plank+WP+lensing, corresponding to a large ??{sup 2} that is equal to 8.6 (1.4% probability). Thus, combining internal inconsistent data sets (SNIa+BAO+HST with Plank+WP+lensing) can lead to ambiguous results, and it is necessary to perform the HDE data analysis for each independent data sets. Our tightest self-consistent constraint is c = 0.495 ± 0.039 obtained from Plank+WP+BAO+HST+lensing.
Limits on the integration constant of the dark radiation term in Brane Cosmology
A. S. Al-Rawaf
2005-05-25T23:59:59.000Z
We consider the constraints from primordial Helium abundances on the constant of integration of the dark radiation term of the brane-world generalized Friedmann equation derived from the Randall-Sundrum Single brane model. We found that -- using simple, approximate and semianalytical Method -- that the constant of integration is limited to be between -8.9 and 2.2 which limits the possible contribution from dark radiation term to be approximately between -27% to 7% of the background photon energy density.
Curvature perturbation spectra from waterfall transition, black hole constraints and non-Gaussianity
Bugaev, Edgar; Klimai, Peter, E-mail: bugaev@pcbai10.inr.ruhep.ru, E-mail: pklimai@gmail.com [Institute for Nuclear Research, Russian Academy of Sciences, 60th October Anniversary Prospect 7a, 117312 Moscow (Russian Federation)
2011-11-01T23:59:59.000Z
We carried out numerical calculations of a contribution of the waterfall field to the primordial curvature perturbation (on uniform density hypersurfaces) ?, which is produced during waterfall transition in hybrid inflation scenario. The calculation is performed for a broad interval of values of the model parameters. We show that there is a strong growth of amplitudes of the curvature perturbation spectrum in the limit when the bare mass-squared of the waterfall field becomes comparable with the square of Hubble parameter. We show that in this limit the primordial black hole constraints on the curvature perturbations must be taken into account. It is shown that, in the same limit, peak values of the curvature perturbation spectra are far beyond horizon, and the spectra are strongly non-Gaussian.
Riemannian geometrical constraints on magnetic vortex filaments in plasmas
L. C. Garcia de Andrade
2005-10-16T23:59:59.000Z
Two theorems on the Riemannian geometrical constraints on vortex magnetic filaments acting as dynamos in (MHD) flows are presented. The use of Gauss-Mainard-Codazzi equations allows us to investigate in detail the influence of curvature and torsion of vortex filaments in the MHD dynamos. This application follows closely previous applications to Heisenberg spin equation to the investigations in magnetohydrostatics given by Schief (Plasma Physics J. 10, 7, 2677 (2003)). The Lorentz force on vortex filaments are computed and the ratio between the forces along different directions are obtained in terms of the ratio between the corresponding magnetic fields which equals also the ratio between the Frenet torsion and vortex line curvature. A similar relation between Lorentz forces, magnetic fields and twist, which is proportional to total torsion integral has been obtained by Ricca (Fluid Dyn. Res. 36,319 (2005)) in the case of inflexional desiquilibrium of magnetic flux-tubes. This is due to the fact that the magnetic vortex lines are a limit case of the magnetic flux-tubes when the lenght of the tube is much greater than the radius of the tube. Magnetic helicity equation of the filament allows us again to determine the magnetic fields ratio from Frenet curvature and torsion of the vortex lines.
Dark Matter Constraints from a Cosmic Index of Refraction
S. Gardner; D. C. Latimer
2010-06-08T23:59:59.000Z
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.
Optimization Online - A cone-continuity constraint qualification and ...
Roberto Andreani
2015-02-13T23:59:59.000Z
Feb 13, 2015 ... A cone-continuity constraint qualification and algorithmic consequences. Roberto Andreani(andreani ***at*** ime.unicamp.br) Jose Mario ...
Neurophenomenological Constraints and Pushing Back the Subjectivity Barrier
MacLennan, Bruce
Neurophenomenological Constraints and Pushing Back the Subjectivity Barrier Extended commentary inversions), without appealing to weak arguments based on basic color categories; that is, I suggest
Towards an Optimal Approach to Soft Constraint Problems
Ward, Karen
these constraints. In this case, it is desirable to find a design that satisfies a given finite set of inequality/equality
Constraints on absolute neutrino Majorana mass from current data
Huang, Yanqi
2014-01-01T23:59:59.000Z
We present new constraints on the neutrino Majorana masses from the current data of neutrinoless double beta decay and neutrino flavour mixing. With the latest results of $0\
Control problems with mixed constraints and application to an ...
2009-06-04T23:59:59.000Z
Abstract We discuss two optimal control problems of parabolic equations, with mixed state and control constraints, for which the standard qualification condition
Microsoft Word - 20140415 Infrastructure Constraints in New England...
Broader source: Energy.gov (indexed) [DOE]
have also implemented programs to switch residential and commercial customers from propane and home heating oil to natural gas, which could further exacerbate constraints on...
Consistent Query Answering Of Conjunctive Queries Under Primary Key Constraints
Pema, Enela
2014-01-01T23:59:59.000Z
Queries and Primary Key Constraints . . . . . . . . . .of Employee w.r.t. the primary key SSN ? {name, salary} . .query answering under primary keys: a characterization of
Constraints On The Mechanism Of Long-Term, Steady Subsidence...
Constraints On The Mechanism Of Long-Term, Steady Subsidence At Medicine Lake Volcano, Northern California, From Gps, Leveling, And Insar Jump to: navigation, search OpenEI...
Optimization Online - A Constraint-Reduced Algorithm for ...
Sungwoo Park
2015-05-21T23:59:59.000Z
May 21, 2015 ... Park and O'Leary proposed a constraint-reduced predictor-corrector algorithm for semidefinite programming with polynomial global ...
A Constraint-reduced Algorithm for Semidefinite Optimization ...
2015-06-02T23:59:59.000Z
Jun 2, 2015 ... More recently, Park and O'Leary [26, 27] developed a constraint- reduced predictor-corrector IPM for SDP and proved its polynomial global ...
A Taxonomy of Constraints in Simulation-Based Optimization
Sébastien Le Digabel
2015-05-28T23:59:59.000Z
May 28, 2015 ... A Taxonomy of Constraints in Simulation-Based Optimization. Sébastien Le Digabel(sebastien.le.digabel ***at*** gerad.ca) Stefan M. Wild(wild ...
Microsoft Word - 20140415 Infrastructure Constraints in New England...
Analysis Staff, United States Department of Energy Re: Infrastructure Constraints in New England 1. Introduction On January 9, 2014, President Obama issued a Presidential...
Leisure constraints which affect continued nonresident hunter participation
Cook, Kathrine Helen
1994-01-01T23:59:59.000Z
not significantly different in the constraints they felt affected their hunting participation. Both groups listed no time due to family or work commitments, high lease cost, and distance as their greatest constraints to hunting in Texas. No significant...: Q. Sc: no place to hunt Q. 8g: equipment and supplies too costly Q, Si: lease cost too high Q. Sj: not enough time due to work Q. 8m: have to drive too far *Level of constraint was 0-5; 0 = no constraint, 5 = very constrained Note: see...
A Taxonomy of Constraints in Simulation-Based Optimization
2015-05-28T23:59:59.000Z
(e.g., hidden constraints) for a historical perspective, and we illustrate the use of ..... Industrial & Engineering Chemistry Process Design and Development, 6 (
Geometric Constraint in Brane-World
E. M. Monte
2006-02-15T23:59:59.000Z
The brane-worlds model was inspired partly by Kaluza-Klein's theory, where the gravitation and the gauge fields are obtained of a geometry of higher dimension (bulk). Such a model has been showing positive in the sense of we find perspectives and probably deep modifications in the physics, such as: Unification in a scale TeV, quantum gravity in this scale and deviation of Newton's law for small distances. One of the principles of this model is to suppose a space-time embedded in a bulk of high dimension. In this note it is shown, basing on the theorem of Collinson-Szekeres, that the space-time of Schwarzschild cannot be embedded locally and isometrically in a bulk of five dimensions with constant curvature,(for example ADS-5). From the point of view of the semi-Riemannian geometry this last result consists constraints to the model brane-world.
Observational constraints on braneworld chaotic inflation
Andrew R Liddle; Anthony J Smith
2003-08-13T23:59:59.000Z
We examine observational constraints on chaotic inflation models in the Randall-Sundrum Type II braneworld. If inflation takes place in the high-energy regime, the perturbations produced by the quadratic potential are further from scale-invariance than in the standard cosmology, in the quartic case more or less unchanged, while for potentials of greater exponent the trend is reversed. We test these predictions against a data compilation including the WMAP measurements of microwave anisotropies and the 2dF galaxy power spectrum. While in the standard cosmology the quartic potential is at the border of what the data allow and all higher powers excluded, we find that in the high-energy regime of braneworld inflation even the quadratic case is under strong observational pressure. We also investigate the intermediate regime where the brane tension is comparable to the inflationary energy scale, where the deviations from scale-invariance prove to be greater.
Chemical Constraints on the Water and Total Oxygen Abundances in the Deep Atmosphere of Saturn
Channon Visscher; Bruce Fegley Jr
2005-01-07T23:59:59.000Z
Thermochemical equilibrium and kinetic calculations for the trace gases CO, PH3, and SiH4 give three independent constraints on the water and total oxygen abundances of Saturn's deep atmosphere. A lower limit to the water abundance of H2O/H2 > 1.7 x 10^-3 is given by CO chemistry while an upper limit of H2O/H2 water enrichment on Saturn of 1.9 to 6.1 times the solar system abundance (H2O/H2 = 8.96 x 10^-4). The total oxygen abundance must be at least 1.7 times the solar system abundance (O/H2 = 1.16 x 10^-3) in order for the SiH4 to remain below a detection limit of SiH4/H2 < 2 x 10^-10. A combination of the CO, PH3, and SiH4 constraints suggests that the total oxygen abundance on Saturn is 3.2 to 6.4 times the solar system abundance. Our results indicate that oxygen on Saturn is less enriched than other heavy elements (such as C and P) relative to a solar system composition. This work was supported by NASA NAG5-11958.
Transitioning Los Alamos technology into the marketplace
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5(Million Cubic Feet) Oregon (Including Vehicle Fuel) (MillionStructural Basis of WntSupportB 18B()The57Toward 300 Miles Beamlines User2,2
Green academy helps researchers enter the marketplace
Broader source: Energy.gov [DOE]
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 academic-minded attending the Green Technology Entrepreneurship Academy, these nuggets are priceless. “We give scientists the language of commercialization,” says Andrew Hargadon, a founder of the academy and faculty director at the Center for Entrepreneurship at the University of California, Davis. “We help them translate their own research into commercial terms, and - at the same time - give them a network of investors, entrepreneurs, utilities, and other major companies to work with.”
Reputation Systems in Labor and Advertising Marketplaces
Daltayanni, Maria
2015-01-01T23:59:59.000Z
Aly et. al. [7] build a web-scale user modeling platform forConference on World Wide Web, WWW ’07, pages 261–270, New2008 International Conference on Web Search and Data Mining,
Timber Products Equipment Services MarketPlace
of The Idea Circle. As of mid December, eight companies have provided a nonbinding intent with the group. Half The Bemidji plant, the largest of all at 500,000 square feet, was purchased by a group called The Idea Circle-minded businesses together to reduce costs while increasing a competitive edge. The group has lost no time
Reputation Systems in Labor and Advertising Marketplaces
Daltayanni, Maria
2015-01-01T23:59:59.000Z
Web, WWW ’07, pages 221–230, New York, NY, USA, 2007. ACM.New York, NY, USA, 2007. ACM. [3] B. Thomas Adler, Luca deNew York, NY, USA, 2008. ACM. [4] Gediminas Adomavicius and
DipZoom: The Internet Measurements Marketplace
Rabinovich, Michael "Misha"
worldwide, with only one location in Africa, Central and South America, and China, and none in Russia. For example, in HTTP, a measurement of a page download done with and without pipelining and persistent themselves. Recent efforts, notably the DIMES and Traceroute@home projects (see [7], [32] and papers listed
GE's Digital Marketplace to Revolutionize Manufacturing | GE...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
when the product is in use. The digital thread is the seamless flow of data across the product lifecycle. Today, very little data is transferred from end to end of the...
Attachment F Marketplace Prohibited Items November 2014
Containers, and Steel Drums · Food and Break Room Supplies · Green Organic Kitty Litters or Packaging Mediums (specifically waste Loc 770, zeolitic clay, swheat organic kitty litter) · Hazardous Material Packaging
Nickel aluminides: Breaking into the marketplace
Krause, C.
1995-12-31T23:59:59.000Z
Nurtured by ORNL researchers for almost 15 years, nickel aluminides may have found their niche. ORNL`s modified nickel aluminides are receiving considerable attention by the heat-treating industry in the United States and may have arrived just in the nick of time to make some companies more competitive. Nickel aluminides are intermetallic materials that have long been considered potentially useful because, thanks to their ordered crystal structure, they are very strong and hard and melt only at very high temperatures. But they had a serious weakness: they were too brittle to be shaped into reliable components. Then, in 1982, ORNL researchers led by Chain T. Liu in the Metals and Ceramics Division found the secret recipe for producing a ductile nickel aluminide alloy: add trace amounts of a few alloying elements in the right proportion. It was like turning peanut brittle into taffy. Their most important discovery was that the addition of a small amount of boron (200 parts per million) to a nickel aluminide alloy (Ni{sub 3}Al) makes the alloy highly ductile at room temperature. To address the safety concerns of the alloy preparation industry, Vinod Sikka and Joseph Vought developed a new process in collaboration with Seetharama Deevi, who was on a 1-year sabbatical at ORNL from the Research Center at Philip Morris in Richmond, Virginia. The development is called the Exo-Melt process.
Geothermal Direct Use Technology and the Marketplace
Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:Department ofFormer Worker/Energy CompensationGENESISCooled Fast Reactors |Case StudyDirect UseDOE
Marketplace Opportunities for Integration of Biobased and
Ciocan-Fontanine, Ionut
--------------------------------------------------------------------------------------------------------------------------- 7 2. Volumes and key performance attributes of conventional oil based plastics. used in key -------------------------------------------------------------------------------------------------------- 9-10 - Bio based/ compostable plastics conventional plastics market targets----------------------------------------- 10-14 - Polystyrene targeted market size
Geothermal Direct Use Technology & Marketplace Hilton Garden...
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Profitability of Direct Use (K. Beckers) Policy and Regulations (P. Bony) District Heating (J. Lund) Industrial Uses Geothermal (J. Lund) 3:00-4:30 - Discussion...
Attachment F Marketplace Prohibited Items November 2014
, Radio/Wireless Transmitting Equipment (e.g., eavesdropping & wiretapping equipment) · Laser Pointers 3b Purchased through Cuba, Iran, Libya, North Korea, or Sudan · Telecommunication Equipment & Features (cell
COMMENTARY:Limits to adaptation
Preston, Benjamin L [ORNL
2013-01-01T23:59:59.000Z
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.
S. Adamenko; V. Bolotov; V. Novikov
2013-07-17T23:59:59.000Z
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.
Wilson, Graham Wallace; Abbiendi, G.; Ainsley, C.; Å kesson, P. F.; Alexander, G.; Allison, J.; Amaral, P.; Anagnostou, G.; Anderson, K. J.; Asai, S.; Axen, D.; Azuelos, G.; Bailey, I.; Barberio, E.
2004-08-27T23:59:59.000Z
PHYSICAL REVIEW D 70, 032005 ~2004!Constraints on anomalous quartic gauge boson couplings from nn¯ gg and qq¯gg events at CERN LEP2 G. Abbiendi,2 C. Ainsley,5 P. F. Åkesson,3,v G. Alexander,21 J. Allison,15 P. Amaral,8 G. Anagnostou,1 K. J. Anderson..., the ratio of the observ expectation is R(data/SM)50.9260.0760.04, where tainties respectively. The nn¯gg and qq¯gg data are use couplings. Combining with previous OPAL results fr limits on the anomalous coupling parameters a0 Z , ac Z ,0.023 GeV22, 20.029 Ge...
liquid nberwp.tex Liquidity Constraints and Precautionary Saving
Niebur, Ernst
liquid nberwp.tex Liquidity Constraints and Precautionary Saving Christopher D. Carroll ccarroll to the optimal consumption/saving problem under uncertainty have long known that there are quantitatively important in- teractions between liquidity constraints and precautionary saving behavior. This paper
Phase Retrieval for Fresnel Measurements Using a Shearlet Sparsity Constraint
Plonka, Gerlind
Phase Retrieval for Fresnel Measurements Using a Shearlet Sparsity Constraint Stefan Loock Gerlind Plonka March 25, 2014 Abstract We consider the problem of phase retrieval in the Fresnel regime be used for phase reconstruction with Fresnel data. As it turns out, the shearlet sparsity constraint
Constraint methods for neural networks and computer graphics
Platt, J.C.
1989-01-01T23:59:59.000Z
Both computer graphics and neural networks are related, in that they model natural phenomena. Physically-based models are used by computer graphics researchers to create realistic, natural animation, and neural models are used by neural network researchers to create new algorithms or new circuits. To exploit successfully these graphical and neural models, engineers want models that fulfill designer-specified goals. These goals are converted into mathematical constraints. This thesis presents constraint methods for computer graphics and neural networks. The mathematical constraint methods modify the differential equations that govern the neural or physically-based models. The constraint methods gradually enforce the constraints exactly. This thesis also described application of constrained models to real problems. The first half of this theses discusses constrained neural networks. The desired models and goals are often converted into constrained optimization problems. These optimization problems are solved using first-order differential equations. The applications of constrained neural networks include the creation of constrained circuits, error-correcting codes, symmetric edge detection for computer vision, and heuristics for the traveling salesman problem. The second half of this thesis discusses constrained computer graphics models. In computer graphics, the desired models and goals become constrained mechanical systems, which are typically simulated with second-order differential equations. The Penalty Method adds springs to the mechanical system to penalize violations of the constraints. Rate Controlled Constraints add forces and impulses to the mechanical system to fulfill the constraints with critically damped motion.
A Constraint Programming Approach to the Hospitals / Residents Problem
Manlove, D.F.
Manlove,D.F. O'Malley,G. Prosser,P. Unsworth,C. In Proceedings of the Fourth Workshop on Modelling and Reformulating Constraint Satisfaction Problems, held at the 11th International Conference on Principles and Practice of Constraint Programming (CP 2005) pp 28-43
Transient Analysis of Linear Circuits using Constraint Logic Programming
Gilbert, David
Transient Analysis of Linear Circuits using Constraint Logic Programming Archana Shankar, David London EC1V 0HB, UK Abstract This paper describes the design of a transient analysis program for linear circuits and its implementation in a Constraint Logic Programming language, CLP(R). The transient analysis
Improving Cost Calculations for Global Constraints in Local Search
Rossi, Francesca
Improving Cost Calculations for Global Constraints in Local Search Markus Bohlin Swedish Institute- straint satisfaction is based on local minimization of a cost function, which is usually the number equivalent to a set of basic constraints but still contributes as little to the cost as a single basic
Anisotropic constraints on energy distribution in rotating and stratified turbulence
Kurien, Susan
OFFPRINT Anisotropic constraints on energy distribution in rotating and stratified turbulence S) 24003 www.epljournal.org doi: 10.1209/0295-5075/84/24003 Anisotropic constraints on energy distribution enstrophy constrains the spectral distribution of horizontal kinetic energy and potential energy. Horizontal
Supplementary Materials (ID: 0290) Section 1: Auxilary Variables and Constraints
Lau, W. H. Nynson
segment label assignment indicator mentioned above. The equivalent linear constraints are ti,j k hk constraints required for the selected nodes and edges to form a connected graph. In Mixed Integer Programming, some auxiliary variables are defined to capture certain events (i.e., a particular assignment to all
Optimal Control of a Continuous Distillation Process under Probabilistic Constraints
Henrion, René
Optimal Control of a Continuous Distillation Process under Probabilistic Constraints René Henrion1 Universität Berlin, Germany Abstract A continuous distillation process with random inflow rate is considered model including the dynamics of the distillation process and proba- bilistic constraints under different
Rapidly mixing Markov chains for dismantleable constraint graphs
Dyer, Martin
Rapidly mixing Markov chains for dismantleable constraint graphs Martin Dyer Mark Jerrum Eric adjacency. Brightwell and Winkler introduced the notion of dismantleable constraint graph to characterize proportional to vVG ((v)). We prove, for each dismantleable H, that there exist positive constant fugacities
Limitations of the planning organ at risk volume (PRV) concept
Stroom, Joep C. [Netherlands Cancer Institute, Department of Radiation Oncology, Amsterdam (Netherlands)]. E-mail: j.stroom@nki.nl; Heijmen, Ben J.M. [Erasmus MC-Daniel den Hoed Cancer Center, Department of Radiation Oncology, Rotterdam (Netherlands)
2006-09-01T23:59:59.000Z
Purpose: Previously, we determined a planning target volume (PTV) margin recipe for geometrical errors in radiotherapy equal to M{sub T} = 2{sigma} + 0.7{sigma}, with {sigma} and {sigma} standard deviations describing systematic and random errors, respectively. In this paper, we investigated margins for organs at risk (OAR), yielding the so-called planning organ at risk volume (PRV). Methods and Materials: For critical organs with a maximum dose (D{sub max}) constraint, we calculated margins such that D{sub max} in the PRV is equal to the motion averaged D{sub max} in the (moving) clinical target volume (CTV). We studied margins for the spinal cord in 10 head-and-neck cases and 10 lung cases, each with two different clinical plans. For critical organs with a dose-volume constraint, we also investigated whether a margin recipe was feasible. Results: For the 20 spinal cords considered, the average margin recipe found was: M{sub R} = 1.6{sigma} + 0.2{sigma} with variations for systematic and random errors of 1.2{sigma} to 1.8{sigma} and -0.2{sigma} to 0.6{sigma}, respectively. The variations were due to differences in shape and position of the dose distributions with respect to the cords. The recipe also depended significantly on the volume definition of D{sub max}. For critical organs with a dose-volume constraint, the PRV concept appears even less useful because a margin around, e.g., the rectum changes the volume in such a manner that dose-volume constraints stop making sense. Conclusion: The concept of PRV for planning of radiotherapy is of limited use. Therefore, alternative ways should be developed to include geometric uncertainties of OARs in radiotherapy planning.
Irais Bautista; Jorge Dias de Deus; José Guilherme Milhano; Carlos Pajares
2012-04-06T23:59:59.000Z
We show that the dependence of the charged particle multiplicity on the centre-of-mass energy of the collision is, in the String Percolation Model, driven by the same power law behavior in both proton-proton and nucleus- nucleus collisions. The observed different growths are a result of energy- momentum constraints that limit the number of formed strings at low en- ergy. Based on the very good description of the existing data, we provide predictions for future high energy LHC runs.
Bautista, Irais; Milhano, José Guilherme; Pajares, Carlos
2012-01-01T23:59:59.000Z
We show that the dependence of the charged particle multiplicity on the centre-of-mass energy of the collision is, in the String Percolation Model, driven by the same power law behavior in both proton-proton and nucleus- nucleus collisions. The observed different growths are a result of energy- momentum constraints that limit the number of formed strings at low en- ergy. Based on the very good description of the existing data, we provide predictions for future high energy LHC runs.
China's Coal: Demand, Constraints, and Externalities
Aden, Nathaniel; Fridley, David; Zheng, Nina
2009-07-01T23:59:59.000Z
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.
Bhashyam, Srikrishna
System model Scope of Work Short term power constraint Long term power constraint Imperfect CSIR Prediction Summary Spatial and Temporal Power Allocation for MISO Systems with Delayed Feedback Srikrishna) feedback #12;System model Scope of Work Short term power constraint Long term power constraint Imperfect
Complexity and Algorithms for Two-Stage Flexible Flowshop Scheduling with Availability Constraints
Xie, Jinxing
Complexity and Algorithms for Two-Stage Flexible Flowshop Scheduling with Availability Constraints problem with availability constraints. We discuss the complexity and the approximability of the problem cases of the problem. Keywords: Scheduling; Flexible flowshop; Availability constraints; Approximability
Cosmological constraints on extended Galileon models
Felice, Antonio De [ThEP's CRL, NEP, The Institute for Fundamental Study, Naresuan University, Phitsanulok 65000 (Thailand); Tsujikawa, Shinji, E-mail: antoniod@nu.ac.th, E-mail: shinji@rs.kagu.tus.ac.jp [Department of Physics, Faculty of Science, Tokyo University of Science, 1-3, Kagurazaka, Shinjuku-ku, Tokyo 162-8601 (Japan)
2012-03-01T23:59:59.000Z
The extended Galileon models possess tracker solutions with de Sitter attractors along which the dark energy equation of state is constant during the matter-dominated epoch, i.e. w{sub DE} = ?1?s, where s is a positive constant. Even with this phantom equation of state there are viable parameter spaces in which the ghosts and Laplacian instabilities are absent. Using the observational data of the supernovae type Ia, the cosmic microwave background (CMB), and baryon acoustic oscillations, we place constraints on the tracker solutions at the background level and find that the parameter s is constrained to be s = 0.034{sub ?0.034}{sup +0.327} (95 % CL) in the flat Universe. In order to break the degeneracy between the models we also study the evolution of cosmological density perturbations relevant to the large-scale structure (LSS) and the Integrated-Sachs-Wolfe (ISW) effect in CMB. We show that, depending on the model parameters, the LSS and the ISW effect is either positively or negatively correlated. It is then possible to constrain viable parameter spaces further from the observational data of the ISW-LSS cross-correlation as well as from the matter power spectrum.
Curvature constraints from the causal entropic principle
Bozek, Brandon; Albrecht, Andreas; Phillips, Daniel [Physics Department, University of California, Davis, One Shields Avenue, Davis, California 95616-8677 (United States)
2009-07-15T23:59:59.000Z
Current cosmological observations indicate a preference for a cosmological constant that is drastically smaller than what can be explained by conventional particle physics. The causal entropic principle (Bousso et al.) provides an alternative approach to anthropic attempts to predict our observed value of the cosmological constant by calculating the entropy created within a causal diamond. We have extended this work to use the causal entropic principle to predict the preferred curvature within the 'multiverse'. We have found that values larger than {rho}{sub k}=40{rho}{sub m} are disfavored by more than 99.99% peak value at {rho}{sub {lambda}}=7.9x10{sup -123} and {rho}{sub k}=4.3{rho}{sub m} for open universes. For universes that allow only positive curvature or both positive and negative curvature, we find a correlation between curvature and dark energy that leads to an extended region of preferred values. Our universe is found to be disfavored to an extent depending on the priors on curvature. We also provide a comparison to previous anthropic constraints on open universes and discuss future directions for this work.
Planck 2015. XX. Constraints on inflation
Ade, P A R; Arnaud, M; Arroja, F; Ashdown, M; Aumont, J; Baccigalupi, C; Ballardini, M; Banday, A J; Barreiro, R B; Bartolo, N; Battaner, E; Benabed, K; Benoit, A; Benoit-Levy, A; Bernard, J -P; Bersanelli, M; Bielewicz, P; Bonaldi, A; Bonavera, L; Bond, J R; Borrill, J; Bouchet, F R; Boulanger, F; Bucher, M; Burigana, C; Butler, R C; Calabrese, E; Cardoso, J -F; Catalano, A; Challinor, A; Chamballu, A; Chary, R -R; Chiang, H C; Christensen, P R; Church, S; Clements, D L; Colombi, S; Colombo, L P L; Combet, C; Contreras, D; Couchot, F; Coulais, A; Crill, B P; Curto, A; Cuttaia, F; Danese, L; Davies, R D; Davis, R J; de Bernardis, P; de Rosa, A; de Zotti, G; Delabrouille, J; Desert, F -X; Diego, J M; Dole, H; Donzelli, S; Dore, O; Douspis, M; Ducout, A; Dupac, X; Efstathiou, G; Elsner, F; Ensslin, T A; Eriksen, H K; Fergusson, J; Finelli, F; Forni, O; Frailis, M; Fraisse, A A; Franceschi, E; Frejsel, A; Frolov, A; Galeotta, S; Galli, S; Ganga, K; Gauthier, C; Giard, M; Giraud-Heraud, Y; Gjerlow, E; Gonzalez-Nuevo, J; Gorski, K M; Gratton, S; Gregorio, A; Gruppuso, A; Gudmundsson, J E; Hamann, J; Handley, W; Hansen, F K; Hanson, D; Harrison, D L; Henrot-Versille, S; Hernandez-Monteagudo, C; Herranz, D; Hildebrandt, S R; Hivon, E; Hobson, M; Holmes, W A; Hornstrup, A; Hovest, W; Huang, Z; Huffenberger, K M; Hurier, G; Jaffe, A H; Jaffe, T R; Jones, W C; Juvela, M; Keihanen, E; Keskitalo, R; Kim, J; Kisner, T S; Kneissl, R; Knoche, J; Kunz, M; Kurki-Suonio, H; Lagache, G; Lahteenmaki, A; Lamarre, J -M; Lasenby, A; Lattanzi, M; Lawrence, C R; Leonardi, R; Lesgourgues, J; Levrier, F; Lewis, A; Liguori, M; Lilje, P B; Linden-Vornle, M; Lopez-Caniego, M; Lubin, P M; Ma, Y -Z; Macias-Perez, J F; Maggio, G; Maino, D; Mandolesi, N; Mangilli, A; Martin, P G; Martinez-Gonzalez, E; Masi, S; Matarrese, S; Mazzotta, P; McGehee, P; Meinhold, P R; Melchiorri, A; Mendes, L; Mennella, A; Migliaccio, M; Mitra, S; Miville-Deschenes, M -A; Molinari, D; Moneti, A; Montier, L; Morgante, G; Mortlock, D; Moss, A; Munchmeyer, M; Munshi, D; Murphy, J A; Naselsky, P; Nati, F; Natoli, P; Netterfield, C B; Norgaard-Nielsen, H U; Noviello, F; Novikov, D; Novikov, I; Oxborrow, C A; Paci, F; Pagano, L; Pajot, F; Paladini, R; Pandolfi, S; Paoletti, D; Pasian, F; Patanchon, G; Pearson, T J; Peiris, H V; Perdereau, O; Perotto, L; Perrotta, F; Pettorino, V; Piacentini, F; Piat, M; Pierpaoli, E; Pietrobon, D; Plaszczynski, S; Pointecouteau, E; Polenta, G; Popa, L; Pratt, G W; Prezeau, G; Prunet, S; Puget, J -L; Rachen, J P; Reach, W T; Rebolo, R; Reinecke, M; Remazeilles, M; Renault, C; Renzi, A; Ristorcelli, I; Rocha, G; Rosset, C; Rossetti, M; Roudier, G; Rowan-Robinson, M; Rubino-Martin, J A; Rusholme, B; Sandri, M; Santos, D; Savelainen, M; Savini, G; Scott, D; Seiffert, M D; Shellard, E P S; Shiraishi, M; Spencer, L D; Stolyarov, V; Stompor, R; Sudiwala, R; Sunyaev, R; Sutton, D; Suur-Uski, A -S; Sygnet, J -F; Tauber, J A; Terenzi, L; Toffolatti, L; Tomasi, M; Tristram, M; Trombetti, T; Tucci, M; Tuovinen, J; Valenziano, L; Valiviita, J; Van Tent, B; Vielva, P; Villa, F; Wade, L A; Wandelt, B D; Wehus, I K; White, M; Yvon, D; Zacchei, A; Zibin, J P; Zonca, A
2015-01-01T23:59:59.000Z
We present the implications for cosmic inflation of the Planck measurements of the cosmic microwave background (CMB) anisotropies in both temperature and polarization based on the full Planck survey. The Planck full mission temperature data and a first release of polarization data on large angular scales measure the spectral index of curvature perturbations to be $n_\\mathrm{s} = 0.968 \\pm 0.006$ and tightly constrain its scale dependence to $d n_s/d \\ln k =-0.003 \\pm 0.007$ when combined with the Planck lensing likelihood. When the high-$\\ell$ polarization data is included, the results are consistent and uncertainties are reduced. The upper bound on the tensor-to-scalar ratio is $r_{0.002} < 0.11$ (95% CL), consistent with the B-mode polarization constraint $r< 0.12$ (95% CL) obtained from a joint BICEP2/Keck Array and Planck analysis. These results imply that $V(\\phi) \\propto \\phi^2$ and natural inflation are now disfavoured compared to models predicting a smaller tensor-to-scalar ratio, such as $R^2$ ...
Observational constraints on Visser's cosmological model
Alves, M. E. S.; Araujo, J. C. N. de; Miranda, O. D.; Wuensche, C. A. [INPE - Instituto Nacional de Pesquisas Espaciais - Divisao de Astrofisica, Av.dos Astronautas 1758, Sao Jose dos Campos, 12227-010 SP (Brazil); Carvalho, F. C. [INPE - Instituto Nacional de Pesquisas Espaciais - Divisao de Astrofisica, Av.dos Astronautas 1758, Sao Jose dos Campos, 12227-010 SP (Brazil); UERN - Universidade do Estado do Rio Grande do Norte, Mossoro, 59610-210, RN (Brazil); Santos, E. M. [UFRJ - Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21945-970, RJ (Brazil)
2010-07-15T23:59:59.000Z
Theories of gravity for which gravitons can be treated as massive particles have presently been studied as realistic modifications of general relativity, and can be tested with cosmological observations. In this work, we study the ability of a recently proposed theory with massive gravitons, the so-called Visser theory, to explain the measurements of luminosity distance from the Union2 compilation, the most recent Type-Ia Supernovae (SNe Ia) data set, adopting the current ratio of the total density of nonrelativistic matter to the critical density ({Omega}{sub m}) as a free parameter. We also combine the SNe Ia data with constraints from baryon acoustic oscillations (BAO) and cosmic microwave background (CMB) measurements. We find that, for the allowed interval of values for {Omega}{sub m}, a model based on Visser's theory can produce an accelerated expansion period without any dark energy component, but the combined analysis (SNe Ia+BAO+CMB) shows that the model is disfavored when compared with the {Lambda}CDM model.
Limit theory for overfit models
Calhoun, Grayson Ford
2009-01-01T23:59:59.000Z
theory. . . . . . . . . . . . . . . . . . . . . . . . .1.2 Asymptotic Theory and Main Results . . . . . . . . .Chapter 2 Limit theory for comparing over?t models out-of-
Constraints on cosmic strings from the LIGO-Virgo gravitational-wave detectors
J. Aasi; J. Abadie; B. P. Abbott; R. Abbott; T. Abbott; M. R. Abernathy; T. Accadia; F. Acernese; C. Adams; T. Adams; R. X. Adhikari; C. Affeldt; M. Agathos; N. Aggarwal; O. D. Aguiar; P. Ajith; B. Allen; A. Allocca; E. Amador Ceron; D. Amariutei; R. A. Anderson; S. B. Anderson; W. G. Anderson; K. Arai; M. C. Araya; C. Arceneaux; J. Areeda; S. Ast; S. M. Aston; P. Astone; P. Aufmuth; C. Aulbert; L. Austin; B. E. Aylott; S. Babak; P. T. Baker; G. Ballardin; S. W. Ballmer; J. C. Barayoga; D. Barker; S. H. Barnum; F. Barone; B. Barr; L. Barsotti; M. Barsuglia; M. A. Barton; I. Bartos; R. Bassiri; A. Basti; J. Batch; J. Bauchrowitz; Th. S. Bauer; M. Bebronne; B. Behnke; M. Bejger; M. G. Beker; A. S. Bell; C. Bell; I. Belopolski; G. Bergmann; J. M. Berliner; D. Bersanetti; A. Bertolini; D. Bessis; J. Betzwieser; P. T. Beyersdorf; T. Bhadbhade; I. A. Bilenko; G. Billingsley; J. Birch; M. Bitossi; M. A. Bizouard; E. Black; J. K. Blackburn; L. Blackburn; D. Blair; M. Blom; O. Bock; T. P. Bodiya; M. Boer; C. Bogan; C. Bond; F. Bondu; L. Bonelli; R. Bonnand; R. Bork; M. Born; V. Boschi; S. Bose; L. Bosi; J. Bowers; C. Bradaschia; P. R. Brady; V. B. Braginsky; M. Branchesi; C. A. Brannen; J. E. Brau; J. Breyer; T. Briant; D. O. Bridges; A. Brillet; M. Brinkmann; V. Brisson; M. Britzger; A. F. Brooks; D. A. Brown; D. D. Brown; F. Brückner; T. Bulik; H. J. Bulten; A. Buonanno; D. Buskulic; C. Buy; R. L. Byer; L. Cadonati; G. Cagnoli; J. Calderón Bustillo; E. Calloni; J. B. Camp; P. Campsie; K. C. Cannon; B. Canuel; J. Cao; C. D. Capano; F. Carbognani; L. Carbone; S. Caride; A. Castiglia; S. Caudill; M. Cavagliá; F. Cavalier; R. Cavalieri; G. Cella; C. Cepeda; E. Cesarini; R. Chakraborty; T. Chalermsongsak; S. Chao; P. Charlton; E. Chassande-Mottin; X. Chen; Y. Chen; A. Chincarini; A. Chiummo; H. S. Cho; J. Chow; N. Christensen; Q. Chu; S. S. Y. Chua; S. Chung; G. Ciani; F. Clara; D. E. Clark; J. A. Clark; F. Cleva; E. Coccia; P. -F. Cohadon; A. Colla; M. Colombini; M. Constancio Jr.; A. Conte; R. Conte; D. Cook; T. R. Corbitt; M. Cordier; N. Cornish; A. Corsi; C. A. Costa; M. W. Coughlin; J. -P. Coulon; S. Countryman; P. Couvares; D. M. Coward; M. Cowart; D. C. Coyne; K. Craig; J. D. E. Creighton; T. D. Creighton; S. G. Crowder; A. Cumming; L. Cunningham; E. Cuoco; K. Dahl; T. Dal Canton; M. Damjanic; S. L. Danilishin; S. D'Antonio; K. Danzmann; V. Dattilo; B. Daudert; H. Daveloza; M. Davier; G. S. Davies; E. J. Daw; R. Day; T. Dayanga; R. De Rosa; G. Debreczeni; J. Degallaix; W. Del Pozzo; E. Deleeuw; S. Deléglise; T. Denker; T. Dent; H. Dereli; V. Dergachev; R. DeRosa; R. DeSalvo; S. Dhurandhar; L. Di Fiore; A. Di Lieto; I. Di Palma; A. Di Virgilio; M. Díaz; A. Dietz; K. Dmitry; F. Donovan; K. L. Dooley; S. Doravari; M. Drago; R. W. P. Drever; J. C. Driggers; Z. Du; J. -C. Dumas; S. Dwyer; T. Eberle; M. Edwards; A. Effler; P. Ehrens; J. Eichholz; S. S. Eikenberry; G. Endröczi; R. Essick; T. Etzel; K. Evans; M. Evans; T. Evans; M. Factourovich; V. Fafone; S. Fairhurst; Q. Fang; S. Farinon; B. Farr; W. Farr; M. Favata; D. Fazi; H. Fehrmann; D. Feldbaum; I. Ferrante; F. Ferrini; F. Fidecaro; L. S. Finn; I. Fiori; R. Fisher; R. Flaminio; E. Foley; S. Foley; E. Forsi; N. Fotopoulos; J. -D. Fournier; S. Franco; S. Frasca; F. Frasconi; M. Frede; M. Frei; Z. Frei; A. Freise; R. Frey; T. T. Fricke; P. Fritschel; V. V. Frolov; M. -K. Fujimoto; P. Fulda; M. Fyffe; J. Gair; L. Gammaitoni; J. Garcia; F. Garufi; N. Gehrels; G. Gemme; E. Genin; A. Gennai; L. Gergely; S. Ghosh; J. A. Giaime; S. Giampanis; K. D. Giardina; A. Giazotto; S. Gil-Casanova; C. Gill; J. Gleason; E. Goetz; R. Goetz; L. Gondan; G. González; N. Gordon; M. L. Gorodetsky; S. Gossan; S. Goßler; R. Gouaty; C. Graef; P. B. Graff; M. Granata; A. Grant; S. Gras; C. Gray; R. J. S. Greenhalgh; A. M. Gretarsson; C. Griffo; P. Groot; H. Grote; K. Grover; S. Grunewald; G. M. Guidi; C. Guido; K. E. Gushwa; E. K. Gustafson; R. Gustafson; B. Hall; E. Hall; D. Hammer; G. Hammond; M. Hanke; J. Hanks; C. Hanna; J. Hanson; J. Harms; G. M. Harry; I. W. Harry; E. D. Harstad; M. T. Hartman; K. Haughian; K. Hayama; J. Heefner; A. Heidmann; M. Heintze; H. Heitmann; P. Hello; G. Hemming; M. Hendry; I. S. Heng; A. W. Heptonstall; M. Heurs; S. Hild; D. Hoak; K. A. Hodge; K. Holt; M. Holtrop; T. Hong; S. Hooper; T. Horrom; D. J. Hosken; J. Hough; E. J. Howell; Y. Hu; Z. Hua; V. Huang; E. A. Huerta; B. Hughey; S. Husa; S. H. Huttner; M. Huynh; T. Huynh-Dinh; J. Iafrate; D. R. Ingram; R. Inta; T. Isogai; A. Ivanov; B. R. Iyer; K. Izumi; M. Jacobson; E. James; H. Jang; Y. J. Jang; P. Jaranowski; F. Jiménez-Forteza; W. W. Johnson; D. Jones; D. I. Jones; R. Jones; R. J. G. Jonker; L. Ju; Haris K; P. Kalmus; V. Kalogera; S. Kandhasamy; G. Kang; J. B. Kanner; M. Kasprzack; R. Kasturi; E. Katsavounidis; W. Katzman; H. Kaufer; K. Kaufman; K. Kawabe; S. Kawamura; F. Kawazoe
2014-04-07T23:59:59.000Z
Cosmic strings can give rise to a large variety of interesting astrophysical phenomena. Among them, powerful bursts of gravitational waves (GWs) produced by cusps are a promising observational signature. In this Letter we present a search for GWs from cosmic string cusps in data collected by the LIGO and Virgo gravitational wave detectors between 2005 and 2010, with over 625 days of live time. We find no evidence of GW signals from cosmic strings. From this result, we derive new constraints on cosmic string parameters, which complement and improve existing limits from previous searches for a stochastic background of GWs from cosmic microwave background measurements and pulsar timing data. In particular, if the size of loops is given by the gravitational backreaction scale, we place upper limits on the string tension $G\\mu$ below $10^{-8}$ in some regions of the cosmic string parameter space.
Constraints on Light Pseudoscalars Implied by Tests of the Gravitational Inverse-Square Law
Ephraim Fischbach; Dennis E. Krause
1999-06-03T23:59:59.000Z
The exchange of light pseudoscalars between fermions leads to a spin-independent potential in order g^4, where g is the Yukawa pseudoscalar-fermion coupling constant. This potential gives rise to detectable violations of both the weak equivalence principle (WEP) and the gravitational inverse-square law (ISL), even if g is quite small. We show that when previously derived WEP constraints are combined with those arisingfrom ISL tests, a direct experimental limit on the Yukawa coupling of light pseudoscalars to neutrons can be inferred for the first time (g_n^2/4pi < 1.6 \\times 10^-7), along with a new (and significantly improved) limit on the coupling of light pseudoscalars to protons.
Confined disclinations: exterior vs material constraints in developable thin elastic sheets
Efi Efrati; Luka Pocivavsek; Ruben Meza; Ka Yee C. Lee; Thomas A. Witten
2014-10-13T23:59:59.000Z
We examine the shape change of a thin disk with an inserted wedge of material when it is pushed against a plane, using analytical, numerical and experimental methods. Such sheets occur in packaging, surgery and nanotechnology. We approximate the sheet as having vanishing strain, so that it takes a conical form in which straight generators converge to a disclination singularity. Then its shape is that which minimizes elastic bending energy alone. Real sheets are expected to approach this limiting shape as their thickness approaches zero. The planar constraint forces a sector of the sheet to buckle into the third dimension. We find that the unbuckled sector is precisely semicircular, independent of the angle $\\delta$ of the inserted wedge. We generalize the analysis to include conical as well as planar constraints and thereby establish a law of corresponding states for shallow cones of slope $\\epsilon$ and thin wedges. In this regime the single parameter $\\delta/\\epsilon^2$ determines the shape. We discuss the singular limit in which the cone becomes a plane. We discuss the unexpected slow convergence to the semicircular buckling seen experimentally.
Constraints on primordial non-Gaussianity from large scale structure probes
Xia, Jun-Qing; Baccigalupi, Carlo [Scuola Internazionale Superiore di Studi Avanzati, Via Bonomea 265, I-34136 Trieste (Italy); Matarrese, Sabino [Dipartimento di Fisica ''G. Galilei'', Università di Padova, Via Marzolo 8, I-35131 Padova (Italy); Verde, Licia [ICREA (Institució Catalana de Recerca i Estudis Avançats) and Instituto de Ciencias del Cosmos, (ICC-UB-IEEC) Universidad de Barcelona, Marti i Franques 1, 08028, Barcelona (Spain); Viel, Matteo, E-mail: xia@sissa.it, E-mail: bacci@sissa.it, E-mail: sabino.matarrese@pd.infn.it, E-mail: liciaverde@icc.ub.edu, E-mail: viel@oats.inaf.it [INAF-Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, I-34131 Trieste (Italy)
2011-08-01T23:59:59.000Z
In this paper we measure the angular power spectra C{sub l} of three high-redshift large-scale structure probes: the radio sources from the NRAO VLA Sky Survey (NVSS), the quasar catalogue of Sloan Digital Sky Survey Release Six (SDSS DR6 QSOs) and the MegaZ-LRG (DR7), the final SDSS II Luminous Red Galaxy (LRG) photometric redshift survey. We perform a global analysis of the constraints on the amplitude of primordial non-Gaussianity from these angular power spectra, as well as from their cross-correlation power spectra with the cosmic microwave background (CMB) temperature map. In particular, we include non-Gaussianity of the type arising from single-field slow roll, multifields, curvaton (local type), and those which effects on the halo clustering can be described by the equilateral template (related to higher-order derivative type non-Gaussianity) and by the enfolded template (related to modified initial state or higher-derivative interactions). When combining all data sets, we obtain limits of f{sub NL} = 48±20, f{sub NL} = 50±265 and f{sub NL} = 183±95 at 68% confidence level for local, equilateral and enfolded templates, respectively. Furthermore, we explore the constraint on the cubic correction g{sub NL}?{sup 3} on the bias of dark matter haloes and obtain a limit of ?1.2 × 10{sup 5} < g{sub NL} < 11.3 × 10{sup 5} at 95% confidence level.
Performance Limits for Cherenkov Instruments
W. Hofmann
2006-03-17T23:59:59.000Z
The performance of Cherenkov instruments for the detection of very high energy gamma rays is ultimately limited by the fluctuations in the development of air showers. With particular emphasis on the angular resolution, the ultimate performance limits are investigated on the basis of simulations.
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
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}< 10{sup 4} Mpc{sup -1}. Here, we study constraints on the primordial power spectrum derived from COBE/FIRAS and forecasted for PIXIE. We show that measurements of {mu} and y impose strong bounds on the integrated small-scale power, and we demonstrate how to compute these constraints using k-space 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.
Genetic Programming with Guaranteed Constraints Colin G. Johnson
Kent, University of
Genetic Programming with Guaranteed Constraints Colin G. Johnson Computing Laboratory University programming is a powerful technique for automatically generating program code from a description of the desired functionality. However it is frequently distrusted by users because the programs are generated
Modelling and solving the stable marriage problem using constraint programming
Manlove, D.F.
Manlove,D.F. O'Malley,G. Proceedings of the Fifth Workshop on Modelling and Solving Problems with Constraints, held at the 19th International Joint Conference on Artificial Intelligence (IJCAI 2005) pp 10-17
Transient Analysis of Linear Circuits using Constraint Logic Programming
Shankar, A.; Gilbert, D.
Shankar,A. Gilbert,D. Jampel,M. Proceedings of PACT96: Practical Application of Constraint Technology, The Practical Applications Company Ltd pp 221-247 Academic Press
A note on unbounded on/off constraints
H. Hijazi, L. Liberti
2014-11-12T23:59:59.000Z
a NICTA - 7 London Circuit - Canberra ACT 2601 Australia ... This note presents a theoretical analysis of disjunctive constraints featuring ... In mixed-integer linear programming, years of research have been devoted to study disjunctive.
Observational Constraints on the Nature of the Dark Energy: First...
Office of Scientific and Technical Information (OSTI)
the dark energy equation-of-state parameter, w P(rhocsup 2), using 60 Type Ia supernovae (SNe Ia) from the ESSENCE supernova survey. We derive a set of constraints on the...
Future Impacts of Coal Distribution Constraints on Coal Cost
McCollum, David L
2007-01-01T23:59:59.000Z
Railroads”, Conference on the Future of Coal, U.S. SenateFuture Impacts of Coal Distribution Constraints on Coal Costone at that! -ii- Future Impacts of Coal Distribution
Large-Scale Learning of Word Relatedness with Constraints
Morik, Katharina
by another valid (i.e., not misspelled) word. Estimating word related- ness in context can help us determine of related- ness. This is done by incorporating word pairs of known related- ness as constraints
Motion Planning for Unmanned Aerial Vehicles with Resource Constraints
Sundar, Kaarthik
2012-10-19T23:59:59.000Z
Small Unmanned Aerial Vehicles (UAVs) are currently used in several surveillance applications to monitor a set of targets and collect relevant data. One of the main constraints that characterize a small UAV is the maximum amount of fuel the vehicle...
Examining Chinese Non-cruisers' Images and Constraints towards Cruising
Zou, Suiwen
2014-08-04T23:59:59.000Z
of cruising. Among the seven tested hypotheses, five of them were supported and two were rejected by the data. The results showed that: 1) images of cruising were negatively correlated with cruising constraints; 2) images of cruising had positive effects...
Motion Planning for Unmanned Aerial Vehicles with Resource Constraints
Sundar, Kaarthik
2012-10-19T23:59:59.000Z
Small Unmanned Aerial Vehicles (UAVs) are currently used in several surveillance applications to monitor a set of targets and collect relevant data. One of the main constraints that characterize a small UAV is the maximum amount of fuel the vehicle...
Effective software testing with a string-constraint solver
Kie?un, Adam
2009-01-01T23:59:59.000Z
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 ...
Learning with Online Constraints: Shifting Concepts and Active Learning
Monteleoni, Claire E.
2006-09-01T23:59:59.000Z
Many practical problems such as forecasting, real-time decisionmaking, streaming data applications, and resource-constrainedlearning, can be modeled as learning with online constraints. Thisthesis is concerned with analyzing ...
Learning with online constraints : shifting concepts and active learning
Monteleoni, Claire E. (Claire Elizabeth), 1975-
2006-01-01T23:59:59.000Z
Many practical problems such as forecasting, real-time decision making, streaming data applications, and resource-constrained learning, can be modeled as learning with online constraints. This thesis is concerned with ...
Rateless Code Based Multimedia Multicasting with Outage Probability Constraints
Blostein, Steven D.
Rateless Code Based Multimedia Multicasting with Outage Probability Constraints Wei Sheng, Wai encoding transmission (PET)-based packetization structure [1] combined with rateless codes. Outage is capable of minimizing the transmission cost while simultaneously guaranteeing outage prob- ability
Nonlinear equality constraints in feasible sequential quadratic programming
Lawrence, C.; Tits, A.
1994-12-31T23:59:59.000Z
In this talk we show that convergence of a feasible sequential quadratic programming algorithm modified to handle smooth nonlinear equality constraints. The modification of the algorithm to incorporate equality constraints is based on a scheme proposed by Mayne and Polak and is implemented in fsqp/cfsqp, an optimization package that generates feasible iterates. Nonlinear equality constraints are treated as {open_quotes}{<=}-type constraints to be satisfied by all iterates, thus precluding any positive value, and an exact penalty term is added to the objective function which penalizes negative values. For example, the problem minimize f(x) s.t. h(x) = 0, with h(x) a scalar, is replaced by minimize f(x) - ch(x) s.t. h(x) {<=} 0. The modified problem is equivalent to the original problem when c is large enough (but finite). Such a value is determined automatically via iterative adjustments.
A Constraint-Reduced Variant of Mehrotra's Predictor-Corrector ...
2010-09-07T23:59:59.000Z
methods for solving the linear systems and assuming a dense constraint matrix A, ... †Department of Electrical and Computer Engineering and the Institute for Systems ... ‡Applied Mathematics and Scientific Computing Program, University of ...
Introduction to Constraint Programming: Tuning the search with Comet
Larrosa, Javier
of Llenguatges i Sistemes Inform`atics Universitat Polit`ecnica de Catalunya Barcelona, Spain larrosa general-purpose solving strategy is the hybridization between depth-first search and constraint
Control of systems subject to uncertainty and constraints
Villota Cerna, Elizabeth Roxana
2009-05-15T23:59:59.000Z
control system typically yields the desirable small signal performance. However, the presence of input constraints often causes undesirable large signal behavior and potential insta¬bility. An anti-windup control consists of a remedial solution...
Multiobjective optimization of a radio telescope array with site constraints
Cohanim, Babak, 1980-
2004-01-01T23:59:59.000Z
The next generation of radio telescope interferometric arrays requires careful design of the array configuration to optimize the performance and minimize the cost of the overall system while adhering to site constraints. ...
A class of nonholonomic kinematic constraints in elasticity
Joris Vankerschaver
2007-03-12T23:59:59.000Z
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.
Unparticle Effects on Unitarity Constraints from Higgs Boson Scattering
Xiao-Gang He; Chung-Cheng Wen
2008-06-10T23:59:59.000Z
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.
Solar system constraints on f(G) gravity models
Antonio De Felice; Shinji Tsujikawa
2009-07-10T23:59:59.000Z
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.
Lesson 8 Infinite Limits and One-sided Limits
2013-09-06T23:59:59.000Z
Sep 6, 2013 ... long-term behavior. A common model for the population of a species in an area is the logistic model: Lesson 8 Infinite Limits and One-sided ...
Nuclear Structure at the Limits
Nazarewicz, Witold
1997-12-31T23:59:59.000Z
One of the frontiers of today`s nuclear science is the ``journey to the limits``: of atomic charge and nuclear mass, of neutron-to-proton ratio, and of angular momentum. The tour to the limits is not only a quest for new, exciting phenomena but the new data are expected, as well, to bring qualitatively new information about the fundamental properties of the nucleonic many-body system, the nature of the nuclear interaction, and nucleonic correlations at various energy-distance scales. In this talk, current developments in nuclear structure at the limits are discussed from a theoretical perspective.
Nuclear Structure at the Limits
Nazarewicz, W.
1998-01-12T23:59:59.000Z
One of the frontiers of today?s nuclear science is the ?journey to the limits? of atomic charge and nuclear mass, of neutron-to-proton ratio, and of angular momentum. The tour to the limits is not only a quest for new, exciting phenomena, but the new data are expected, as well, to bring qualitatively new information about the fundamental properties of the nucleonic many-body system, the nature of the nuclear interaction, and nucleonic correlations at various energy-distance scales. In this series of lectures, current developments in nuclear structure at the limits are discussed from a theoretical perspective, mainly concentrating on medium-mass and heavy nuclei.
Axion Stars in the Infrared Limit
Joshua Eby; Peter Suranyi; Cenalo Vaz; L. C. R. Wijewardhana
2015-02-06T23:59:59.000Z
Following Ruffini and Bonazzola, we use a quantized boson field to describe condensates of axions forming compact objects. Without substantial modifications, the method can only be applied to axions with decay constant, $f_a$, satisfying $\\delta=(f_a\\,/\\,M_P)^2\\ll 1$, where $M_P$ is the Planck mass. Similarly, the applicability of the Ruffini-Bonazzola method to axion stars also requires that the relative binding energy of axions satisfies $\\Delta=\\sqrt{1-(E_a\\,/\\,m_a)^2}\\ll1$, where $E_a$ and $m_a$ are the energy and mass of the axion. The simultaneous expansion of the equations of motion in $\\delta$ and $\\Delta$ leads to a simplified set of equations, depending only on the parameter, $\\lambda=\\sqrt{\\delta}\\,/\\,\\Delta$ in leading order of the expansions. Keeping leading order in $\\Delta$ is equivalent to the infrared limit, in which only relevant and marginal terms contribute to the equations of motion. The number of axions in the star is uniquely determined by $\\lambda$. Numerical solutions are found in a wide range of $\\lambda$. At small $\\lambda$ the mass and radius of the axion star rise linearly with $\\lambda$. While at larger $\\lambda$ the radius of the star continues to rise, the mass of the star, $M$, attains a maximum at $\\lambda_{\\rm max}\\simeq 0.58$. All stars are unstable for $\\lambda>\\lambda_{\\rm max}$ . We discuss the relationship of our results to current observational constraints on dark matter and the phenomenology of Fast Radio Bursts.
Tao, Jianmin [Los Alamos National Laboratory; Perdew, John P [TULANE UNIV; Staroverov, Viktor N [UNIV OF WESTERN ONTARIO; Scuseria, Gustavo E [RICE UNIV
2008-01-01T23:59:59.000Z
We construct a nonlocal density functional approximation with full exact exchange, while preserving the constraint-satisfaction approach and justified error cancellations of simpler semilocal functionals. This is achieved by interpolating between different approximations suitable for two extreme regions of the electron density. In a 'normal' region, the exact exchange-correlation hole density around an electron is semilocal because its spatial range is reduced by correlation and because it integrates over a narrow range to -1. These regions are well described by popular semilocal approximations (many of which have been constructed nonempirically), because of proper accuracy for a slowly-varying density or because of error cancellation between exchange and correlation. 'Abnormal' regions, where non locality is unveiled, include those in which exchange can dominate correlation (one-electron, nonuniform high-density, and rapidly-varying limits), and those open subsystems of fluctuating electron number over which the exact exchange-correlation hole integrates to a value greater than -1. Regions between these extremes are described by a hybrid functional mixing exact and semi local exchange energy densities locally (i.e., with a mixing fraction that is a function of position r and a functional of the density). Because our mixing fraction tends to 1 in the high-density limit, we employ full exact exchange according to the rigorous definition of the exchange component of any exchange-correlation energy functional. Use of full exact exchange permits the satisfaction of many exact constraints, but the nonlocality of exchange also requires balanced nonlocality of correlation. We find that this nonlocality can demand at least five empirical parameters (corresponding roughly to the four kinds of abnormal regions). Our local hybrid functional is perhaps the first accurate size-consistent density functional with full exact exchange. It satisfies other known exact constraints, including exactness for all one-electron densities, and provides an excellent, fit 1.0 the 223 molecular enthalpies of formation of the G3/99 set and the 42 reaction barrier heights of the BH42/03 set, improving both (but especially the latter) over most semilocal functionals and global hybrids. Exact constraints, physical insights, and paradigm examples hopefully suppress 'overfitting'.
Kelly, Patrick L.; Fox, Ori D.; Filippenko, Alexei V.; Shen, Ken J.; Zheng, WeiKang; Graham, Melissa L.; Tucker, Brad E. [Department of Astronomy, University of California, Berkeley, CA 94720-3411 (United States); Cenko, S. Bradley [NASA/Goddard Space Flight Center, Code 662, Greenbelt, MD 20771 (United States); Prato, Lisa [Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001 (United States); Schaefer, Gail, E-mail: pkelly@astro.berkeley.edu [The CHARA Array of Georgia State University, Mount Wilson Observatory, Mount Wilson, CA 91023 (United States)
2014-07-20T23:59:59.000Z
We constrain the properties of the progenitor system of the highly reddened Type Ia supernova (SN Ia) 2014J in Messier 82 (M82; d ? 3.5 Mpc). We determine the supernova (SN) location using Keck-II K-band adaptive optics images, and we find no evidence for flux from a progenitor system in pre-explosion near-ultraviolet through near-infrared Hubble Space Telescope (HST) images. Our upper limits exclude systems having a bright red giant companion, including symbiotic novae with luminosities comparable to that of RS Ophiuchi. While the flux constraints are also inconsistent with predictions for comparatively cool He-donor systems (T ? 35,000 K), we cannot preclude a system similar to V445 Puppis. The progenitor constraints are robust across a wide range of R{sub V} and A{sub V} values, but significantly greater values than those inferred from the SN light curve and spectrum would yield proportionally brighter luminosity limits. The comparatively faint flux expected from a binary progenitor system consisting of white dwarf stars would not have been detected in the pre-explosion HST imaging. Infrared HST exposures yield more stringent constraints on the luminosities of very cool (T < 3000 K) companion stars than was possible in the case of SN Ia 2011fe.
Passive fault current limiting device
Evans, Daniel J. (Wheeling, IL); Cha, Yung S. (Darien, IL)
1999-01-01T23:59:59.000Z
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.
Passive fault current limiting device
Evans, D.J.; Cha, Y.S.
1999-04-06T23:59:59.000Z
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.
CSPs and complexity An instance of the constraint satisfaction problem (CSP) consists of a set of
Zhao, Yuxiao
CSPs and complexity An instance of the constraint satisfaction problem (CSP) consists of a set to the variables in a way so that all constraints are (simultaneously) satisfied. The general CSP is NP-complete. However, when the CSP is restricted to a fixed constraint language (a set of allowed constraint
A Big-Bang Nucleosynthesis Limit on the Neutral Fermion Decays into Neutrinos
Motohiko Kusakabe; A. B. Balantekin; Toshitaka Kajino; Y. Pehlivan
2013-04-09T23:59:59.000Z
Using the primordial helium abundance, an upper limit to the magnetic moments for Dirac neutrinos had been provided by imposing restrictions on the number of the additional helicity states. Considering non-thermal photons produced in the decay of the heavy sterile mass eigenstates due to the neutrino magnetic moment, we explore the constraints imposed by the observed abundances of all the light elements produced during the Big Bang nucleosynthesis.
Cosmological constraints on superconducting dark energy models
Keresztes, Zoltán; Harko, Tiberiu; Liang, Shi-Dong
2015-01-01T23:59:59.000Z
We consider cosmological tests of a scalar-vector-tensor gravitational model, in which the dark energy is included in the total action through a gauge invariant, electromagnetic type contribution. The ground state of dark energy, corresponding to a constant potential $V$ is a Bose-Einstein type condensate with spontaneously broken U(1) symmetry. In another words dark energy appears as a massive vector field emerging from a superposition of a massless vector and a scalar field, the latter corresponding to the Goldstone boson. Two particular cosmological models, corresponding to pure electric and pure magnetic type potentials, respectively are confronted with Type IA Supernovae and Hubble parameter data. In the electric case good fit is obtained along a narrow inclined stripe in the $\\Omega _{m}-\\Omega _{V}$ parameter plane, which includes the $\\Lambda $CDM limit. The other points on this admissible region represent superconducting dark energy as a sum of a cosmological constant and a time-evolving contribution...
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NEPTUNE'S WILD DAYS: CONSTRAINTS FROM THE ECCENTRICITY DISTRIBUTION OF THE CLASSICAL KUIPER BELT
Dawson, Rebekah I.; Murray-Clay, Ruth, E-mail: rdawson@cfa.harvard.edu [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, MS-51, Cambridge, MA 02138 (United States)
2012-05-01T23:59:59.000Z
Neptune's dynamical history shaped the current orbits of Kuiper Belt objects (KBOs), leaving clues to the planet's orbital evolution. In the 'classical' region, a population of dynamically 'hot' high-inclination KBOs overlies a flat 'cold' population with distinct physical properties. Simulations of qualitatively different histories for Neptune, including smooth migration on a circular orbit or scattering by other planets to a high eccentricity, have not simultaneously produced both populations. We explore a general Kuiper Belt assembly model that forms hot classical KBOs interior to Neptune and delivers them to the classical region, where the cold population forms in situ. First, we present evidence that the cold population is confined to eccentricities well below the limit dictated by long-term survival. Therefore, Neptune must deliver hot KBOs into the long-term survival region without excessively exciting the eccentricities of the cold population. Imposing this constraint, we explore the parameter space of Neptune's eccentricity and eccentricity damping, migration, and apsidal precession. We rule out much of parameter space, except where Neptune is scattered to a moderately eccentric orbit (e > 0.15) and subsequently migrates a distance {Delta}a{sub N} = 1-6 AU. Neptune's moderate eccentricity must either damp quickly or be accompanied by fast apsidal precession. We find that Neptune's high eccentricity alone does not generate a chaotic sea in the classical region. Chaos can result from Neptune's interactions with Uranus, exciting the cold KBOs and placing additional constraints. Finally, we discuss how to interpret our constraints in the context of the full, complex dynamical history of the solar system.
Venkatasubramanian, Mani V.
Secretary of Energy Efficiency and Renewable Energy, Office of Distributed Energy and Electricty Reliability
Currie, Thayne; Cloutier, Ryan; Jayawardhana, Ray [Department of Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, ON M5S 3H4 (Canada); Burrows, Adam [Department of Astrophysical Science, Princeton University, 4 Ivy Lane, Princeton, NJ 08544 (United States); Girard, Julien H. [European Southern Observatory, Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago (Chile); Fukagawa, Misato [Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043 (Japan); Sorahana, Satoko [Department of Astronomy, Graduate School of Science, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033 (Japan); Kuchner, Marc [Exoplanets and Stellar Astrophysics Laboratory, NASA Goddard Space Flight Center, Code 667, Greenbelt, MD 20771 (United States); Kenyon, Scott J. [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States); Madhusudhan, Nikku [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA (United Kingdom); Itoh, Yoichi [Nishi-Harima Astronomical Observatory, Center for Astronomy, University of Hyago, 407-2 Nishigaichi, Sayo, Hyogo 679-5313 (Japan); Matsumura, Soko [School of Engineering, Physics, and Mathematics, University of Dundee, Dundee DD1 4HN (United Kingdom); Pyo, Tae-Soo [National Astronomical Observatory of Japan, 650 N. Aohoku Place, Hilo, HI 96720 (United States)
2014-11-10T23:59:59.000Z
We present new L' (3.8 ?m) and Br? (4.05 ?m) data and reprocessed archival L' data for the young, planet-hosting star HR 8799 obtained with Keck/NIRC2, VLT/NaCo, and Subaru/IRCS. We detect all four HR 8799 planets in each data set at a moderate to high signal-to-noise ratio (S/N ? 6-15). We fail to identify a fifth planet, 'HR 8799 f', at r < 15 AU at a 5? confidence level: one suggestive, marginally significant residual at 0.''2 is most likely a point-spread function artifact. Assuming companion ages of 30 Myr and the Baraffe planet cooling models, we rule out an HR 8799 f with a mass of 5 M{sub J} (7 M{sub J} ), 7 M{sub J} (10 M{sub J} ), or 12 M{sub J} (13 M{sub J} ) at r {sub proj} ? 12 AU, 9 AU, and 5 AU, respectively. All four HR 8799 planets have red early T dwarf-like L' – [4.05] colors, suggesting that their spectral energy distributions peak in between the L' and M' broadband filters. We find no statistically significant difference in HR 8799 cde's color. Atmosphere models assuming thick, patchy clouds appear to better match HR 8799 bcde's photometry than models assuming a uniform cloud layer. While non-equilibrium carbon chemistry is required to explain HR 8799 b and c's photometry/spectra, evidence for it from HR 8799 d and e's photometry is weaker. Future, deep-IR spectroscopy/spectrophotometry with the Gemini Planet Imager, SCExAO/CHARIS, and other facilities may clarify whether the planets are chemically similar or heterogeneous.
Owens, Hannah L.; Campbell, Lindsay P.; Dornak, Laura Lynnette; Saupe, Erin E.; Barve, Narayani; Soberó n, Jorge; Ingenloff, Kathryn; Lira-Noriega, André s; Hensz, Christopher; Myers, Corinne E.; Peterson, A. Townsend
2012-09-21T23:59:59.000Z
A common application of correlational models of ecological niches of species is to transfer model rules onto other sets of conditions to evaluate distributional potential under those conditions. As with any model fitting ...
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NUCLEOSYNTHESIS CONSTRAINTS ON THE NEUTRON STAR-BLACK HOLE MERGER RATE
Bauswein, A. [Department of Physics, Aristotle University of Thessaloniki, GR-54124 Thessaloniki (Greece); Ardevol Pulpillo, R.; Janka, H.-T. [Max Planck Institute for Astrophysics, Karl-Schwarzschild-Str. 1, D-85748 Garching (Germany); Goriely, S., E-mail: bauswein@MPA-Garching.MPG.DE [Institut d'Astronomie et d'Astrophysique, Université Libre de Bruxelles, C.P. 226, B-1050 Brussels (Belgium)
2014-11-01T23:59:59.000Z
We derive constraints on the time-averaged event rate of neutron star-black hole (NS-BH) mergers by using estimates of the population-integrated production of heavy rapid neutron-capture (r-process) elements with nuclear mass numbers A > 140 by such events in comparison to the Galactic repository of these chemical species. Our estimates are based on relativistic hydrodynamical simulations convolved with theoretical predictions of the binary population. This allows us to determine a strict upper limit of the average NS-BH merger rate of ?6× 10{sup –5} per year. We quantify the uncertainties of this estimate to be within factors of a few mostly because of the unknown BH spin distribution of such systems, the uncertain equation of state of NS matter, and possible errors in the Galactic content of r-process material. Our approach implies a correlation between the merger rates of NS-BH binaries and of double NS systems. Predictions of the detection rate of gravitational-wave signals from such compact object binaries by Advanced LIGO and Advanced Virgo on the optimistic side are incompatible with the constraints set by our analysis.
Horava Gravity in the Effective Field Theory formalism: from cosmology to observational constraints
Frusciante, Noemi; Vernieri, Daniele; Hu, Bin; Silvestri, Alessandra
2015-01-01T23:59:59.000Z
We consider Horava gravity within the framework of the EFT of dark energy and modified gravity. We work out a complete mapping of the theory into the EFT language for an action including all the operators which are relevant for linear perturbations with up to sixth order spatial derivatives. We then employ an updated version of the EFTCAMB/EFTCosmoMC package to study the cosmology of the low-energy limit of Horava gravity and place constraints on its parameters using several cosmological data sets. In particular we consider two cases: the first in which the three parameters of the low-energy theory are all varied and a second case that is tuned to evade PPN constraints, reducing the number of free parameters to two. We employ data sets which include the CMB TT and lensing power spectra by Planck 2013, WMAP low-l polarization spectra, the WiggleZ galaxy power spectrum, the local Hubble measurements, Supernovae data from SNLS, SDSS and HST and the BAO measurements from BOSS, SDSS and 6dFGS. For both cases we es...
Constraints on Very High Energy gamma-ray emission from Gamma-Ray Bursts
R. Atkins; W. Benbow; D. Berley; E. Blaufuss; D. G. Coyne; T. DeYoung; B. L. Dingus; D. E. Dorfan; R. W. Ellsworth; L. Fleysher; R. Fleysher; M. M. Gonzalez; J. A. Goodman; E. Hays; C. M. Hoffman; L. A. Kelley; C. P. Lansdell; J. T. Linnemann; J. E. McEnery; A. I. Mincer; M. F. Morales; P. Nemethy; D. Noyes; J. M. Ryan; F. W. Samuelson; P. M. Saz Parkinson; A. Shoup; G. Sinnis; A. J. Smith; G. W. Sullivan; D. A. Williams; M. E. Wilson; X. W. Xu; G. B. Yodh
2005-03-11T23:59:59.000Z
The Milagro gamma-ray observatory employs a water Cherenkov detector to observe extensive air showers produced by high energy particles interacting in the Earth's atmosphere. Milagro has a wide field of view and high duty cycle, monitoring the northern sky almost continuously in the 100 GeV to 100 TeV energy range. Milagro is, thus, uniquely capable of searching for very high-energy emission from gamma-ray bursts (GRBs) during the prompt emission phase. Detection of >100 GeV counterparts would place powerful constraints on GRB mechanisms. Twenty-five satellite-triggered GRBs occurred within the field of view of Milagro between January 2000 and December 2001. We have searched for counterparts to these GRBs and found no significant emission from any of the burst positions. Due to the absorption of high-energy gamma rays by the extragalactic background light, detections are only expected to be possible for redshifts less than ~0.5. Three of the GRBs studied have measured redshifts. GRB 010921 has a redshift low enough (0.45) to allow an upper limit on the fluence to place an observational constraint on potential GRB models.
Constraints on modified Gauss-Bonnet gravity during big bang nucleosynthesis
Motohiko Kusakabe; Seoktae Koh; K. S. Kim; Myung-Ki Cheoun
2015-07-20T23:59:59.000Z
The modified gravity is considered to be one of possible explanations of the accelerated expansions of the present and the early universe. We study effects of the modified gravity on big bang nucleosynthesis (BBN). If effects of the modified gravity are significant during the BBN epoch, they should be observed as changes of primordial light element abundances. We assume a $f(G)$ term with the Gauss-Bonnet term $G$, during the BBN epoch. A power-law relation of $df/dG \\propto t^p$ where $t$ is the cosmic time was assumed for the function $f(G)$ as an example case. We solve time evolutions of physical variables during BBN in the $f(G)$ gravity model numerically, and analyzed calculated results. It is found that a proper solution for the cosmic expansion rate can be lost in some parameter region. In addition, we show that calculated results of primordial light element abundances can be significantly different from observational data. Especially, observational limits on primordial D abundance leads to the strongest constraint on the $f(G)$ gravity. We then derive constraints on parameters of the $f(G)$ gravity taking into account the existence of the solution of expansion rate and final light element abundances.
A hybrid approach for the modal analysis of continuous systems with localized nonlinear constraints.
Brake, Matthew Robert
2010-10-01T23:59:59.000Z
The analysis of continuous systems with nonlinearities in their domain have previously been limited to either numerical approaches, or analytical methods that are constrained in the parameter space, boundary conditions, or order of the system. The present analysis develops a robust method for studying continuous systems with arbitrary boundary conditions and nonlinearities using the assumption that the nonlinear constraint can be modeled with a piecewise-linear force-deflection constitutive relationship. Under this assumption, a superposition method is used to generate homogeneous boundary conditions, and modal analysis is used to find the displacement of the system in each state of the piecewise-linear nonlinearity. In order to map across each nonlinearity in the piecewise-linear force-deflection profile, a variational calculus approach is taken that minimizes the L2 energy norm between the previous and current states. To illustrate this method, a leaf spring coupled with a connector pin immersed in a viscous fluid is modeled as a beam with a piecewise-linear constraint. From the results of the convergence and parameter studies, a high correlation between the finite-time Lyapunov exponents and the contact time per period of the excitation is observed. The parameter studies also indicate that when the system's parameters are changed in order to reduce the magnitude of the velocity impact between the leaf spring and connector pin, the extent of the regions over which a chaotic response is observed increases.
CONSTRAINTS ON AXION-LIKE PARTICLES FROM X-RAY OBSERVATIONS OF THE HYDRA GALAXY CLUSTER
Wouters, Denis; Brun, Pierre, E-mail: denis.wouters@cea.fr, E-mail: pierre.brun@cea.fr [CEA, Irfu, Centre de Saclay, F-91191 Gif-sur-Yvette (France)
2013-07-20T23:59:59.000Z
Axion-like particles (ALPs) belong to a class of new pseudoscalar particles that generically couple to photons, opening the possibility of oscillations from photons into ALPs in an external magnetic field. Having witnessed the turbulence of their magnetic fields, these oscillations are expected to imprint irregularities on a limited energy range of the spectrum of astrophysical sources. In this study, Chandra observations of the Hydra galaxy cluster are used to constrain the value of the coupling of ALPs to photons. We consider the conversion of X-ray photons from the central source Hydra A in the magnetic field of the cluster. The magnetic field strength and structure are well determined observationally, which adds to the robustness of the analysis. The absence of anomalous irregularities in the X-ray spectrum of Hydra A conservatively provides the most competitive constraints on the coupling constant for ALP masses below 7 Multiplication-Sign 10{sup -12} eV at the level of g{sub {gamma}a} < 8.3 Multiplication-Sign 10{sup -12} GeV{sup -1} at the 95% confidence level. Because of the specific phenomenology involved, these constraints actually hold more generally for very light pseudo-Nambu-Goldstone bosons.
An alternative approach to solving the Hamiltonian constraint
Thomas W. Baumgarte
2012-04-24T23:59:59.000Z
Solving Einstein's constraint equations for the construction of black hole initial data requires handling the black hole singularity. Typically, this is done either with the excision method, in which the black hole interior is excised from the numerical grid, or with the puncture method, in which the singular part of the conformal factor is expressed in terms of an analytical background solution, and the Hamiltonian constraint is then solved for a correction to the background solution that, usually, is assumed to be regular everywhere. We discuss an alternative approach in which the Hamiltonian constraint is solved for an inverse power of the conformal factor. This new function remains finite everywhere, so that this approach requires neither excision nor a split into background and correction. In particular, this method can be used without modification even when the correction to the conformal factor is singular itself. We demonstrate this feature for rotating black holes in the trumpet topology.
Connectivity in Secure Wireless Sensor Networks under Transmission Constraints
Zhao, Jun; Gligor, Virgil
2015-01-01T23:59:59.000Z
In wireless sensor networks (WSNs), the Eschenauer-Gligor (EG) key pre-distribution scheme is a widely recognized way to secure communications. Although connectivity properties of secure WSNs with the EG scheme have been extensively investigated, few results address physical transmission constraints. These constraints reflect real-world implementations of WSNs in which two sensors have to be within a certain distance from each other to communicate. In this paper, we present zero-one laws for connectivity in WSNs employing the EG scheme under transmission constraints. These laws help specify the critical transmission ranges for connectivity. Our analytical findings are confirmed via numerical experiments. In addition to secure WSNs, our theoretical results are also applied to frequency hopping in wireless networks.
MISO Capacity with Per-Antenna Power Constraint
Vu, Mai
2010-01-01T23:59:59.000Z
We establish in closed-form the capacity and the optimal signaling scheme for a MISO channel with per-antenna power constraint. Two cases of channel state information are considered: constant channel known at both the transmitter and receiver, and Rayleigh fading channel known only at the receiver. For the first case, the optimal signaling scheme is beamforming with the phases of the beam weights matched to the phases of the channel coefficients, but the amplitudes independent of the channel coefficients and dependent only on the constrained powers. For the second case, the optimal scheme is to send independent signals from the antennas with the constrained powers. In both cases, the capacity with per-antenna power constraint is usually less than that with sum power constraint.
PHYSICAL CONSTRAINTS ON FAST RADIO BURSTS
Luan, Jing; Goldreich, Peter, E-mail: jingluan@caltech.edu [California Institute of Technology, Pasadena, CA 91125 (United States)
2014-04-20T23:59:59.000Z
Fast radio bursts (FRBs) are isolated, ms radio pulses with dispersion measure (DM) of order 10{sup 3} pc cm{sup –3}. Galactic candidates for the DM of high latitude bursts detected at GHz frequencies are easily dismissed. DM from bursts emitted in stellar coronas are limited by free-free absorption and those from H II regions are bounded by the nondetection of associated free-free emission at radio wavelengths. Thus, if astronomical, FRBs are probably extragalactic. FRB 110220 has a scattering tail of ?5.6 ± 0.1 ms. If the electron density fluctuations arise from a turbulent cascade, the scattering is unlikely to be due to propagation through the diffuse intergalactic plasma. A more plausible explanation is that this burst sits in the central region of its host galaxy. Pulse durations of order ms constrain the sizes of FRB sources implying high brightness temperatures that indicates coherent emission. Electric fields near FRBs at cosmological distances would be so strong that they could accelerate free electrons from rest to relativistic energies in a single wave period.
Chaos, Dirac observables and constraint quantization
Bianca Dittrich; Philipp A. Hoehn; Tim A. Koslowski; Mike I. Nelson
2015-08-08T23:59:59.000Z
There is good evidence that full general relativity is non-integrable or even chaotic. We point out the severe repercussions: differentiable Dirac observables and a reduced phase space do not exist in non-integrable constrained systems and are thus unlikely to occur in a generic general relativistic context. Instead, gauge invariant quantities generally become discontinuous, thus not admitting Poisson-algebraic structures and posing serious challenges to a quantization. Non-integrability also renders the paradigm of relational dynamics cumbersome, thereby straining common interpretations of the dynamics. We illustrate these conceptual and technical challenges with simple toy models. In particular, we exhibit reparametrization invariant models which fail to be integrable and, as a consequence, can either not be quantized with standard methods or lead to sick quantum theories without a semiclassical limit. These troubles are qualitatively distinct from semiclassical subtleties in unconstrained quantum chaos and can be directly traced back to the scarcity of Dirac observables. As a possible resolution, we propose to change the method of quantization by refining the configuration space topology until the generalized observables become continuous in the new topology and can acquire a quantum representation. This leads to the polymer quantization method underlying loop quantum cosmology and gravity. Remarkably, the polymer quantum theory circumvents the problems of the quantization with smooth topology, indicating that non-integrability and chaos, while a challenge, may not be a fundamental obstruction for quantum gravity.
Cosmological constraints on superconducting dark energy models
Zoltán Keresztes; László Á. Gergely; Tiberiu Harko; Shi-Dong Liang
2015-09-01T23:59:59.000Z
We consider cosmological tests of a scalar-vector-tensor gravitational model, in which the dark energy is included in the total action through a gauge invariant, electromagnetic type contribution. The ground state of dark energy, corresponding to a constant potential $V$ is a Bose-Einstein type condensate with spontaneously broken U(1) symmetry. In another words dark energy appears as a massive vector field emerging from a superposition of a massless vector and a scalar field, the latter corresponding to the Goldstone boson. Two particular cosmological models, corresponding to pure electric and pure magnetic type potentials, respectively are confronted with Type IA Supernovae and Hubble parameter data. In the electric case good fit is obtained along a narrow inclined stripe in the $\\Omega _{m}-\\Omega _{V}$ parameter plane, which includes the $\\Lambda $CDM limit. The other points on this admissible region represent superconducting dark energy as a sum of a cosmological constant and a time-evolving contribution. In the magnetic case the cosmological test selects either i) parameter ranges of the superconducting dark energy allowing for the standard baryonic plus dark matter or ii) a unified superconducting dark matter and dark energy model, additionally including only the baryonic sector. The cosmological data is best matched when the matter decouples from both the scalar and vector sectors of dark energy, hence favoring matter conservation as opposed to particle creation in an irreversible process.
Scattering resonances as viscosity limits
Maciej Zworski
2015-05-04T23:59:59.000Z
Using the method of complex scaling we show that scattering resonances of $ - \\Delta + V $, $ V \\in L^\\infty_{\\rm{c}} ( \\mathbb R^n ) $, are limits of eigenvalues of $ - \\Delta + V - i \\epsilon x^2 $ as $ \\epsilon \\to 0+ $. That justifies a method proposed in computational chemistry and reflects a general principle for resonances in other settings.
Local Gravity Constraints and Power Law f(R) Theories
Yousef Bisabr
2010-05-31T23:59:59.000Z
There is a conformal equivalence between power law $f(R)$ theories and scalar field theories in which the scalar degree of freedom evolves under the action of an exponential potential function. In the scalar field representation there is a strong coupling of the scalar field with the matter sector due to the conformal transformation. We use chameleon mechanism to implement constraints on the potential function of the scalar field in order that the resulting model be in accord with Solar System experiments. Investigation of these constraints reveals that there may be no possibility to distinguish between a power law $f(R)$ function and the usual Einstein-Hilbert Lagrangian density.
Properties and Applications of Programs with Monotone and Convex Constraints
Liu, L; 10.1613/jair.2009
2011-01-01T23:59:59.000Z
We study properties of programs with monotone and convex constraints. We extend to these formalisms concepts and results from normal logic programming. They include the notions of strong and uniform equivalence with their characterizations, tight programs and Fages Lemma, program completion and loop formulas. Our results provide an abstract account of properties of some recent extensions of logic programming with aggregates, especially the formalism of lparse programs. They imply a method to compute stable models of lparse programs by means of off-the-shelf solvers of pseudo-boolean constraints, which is often much faster than the smodels system.
Fine-structure constant constraints on Bekenstein-type models
P. M. M. Leal; C. J. A. P. Martins; L. B. Ventura
2014-07-15T23:59:59.000Z
Astrophysical tests of the stability of dimensionless fundamental couplings, such as the fine-structure constant $\\alpha$, are an area of much increased recent activity, following some indications of possible spacetime variations at the few parts per million level. Here we obtain updated constraints on the Bekenstein-Sandvik-Barrow-Magueijo model, which is arguably the simplest model allowing for $\\alpha$ variations. Recent accurate spectroscopic measurements allow us to improve previous constraints by about an order of magnitude. We briefly comment on the dependence of the results on the data sample, as well as on the improvements expected from future facilities.
Convex Hulls of Quadratically Parameterized Sets With Quadratic Constraints
Nie, Jiawang
2011-01-01T23:59:59.000Z
Let V be a semialgebraic set parameterized by quadratic polynomials over a quadratic set T. This paper studies semidefinite representation of its convex hull by projections of spectrahedra (defined by linear matrix inequalities). When T is defined by a single quadratic constraint, we prove that its convex hull is equal to the first order moment type semidefinite relaxation of $V$, up to taking closures. Similar results hold when every quadratic polynomial is homogeneous and T is defined by two homogeneous quadratic constraints,or V is defined by rational quadratic parameterizations.
Mechanical contact by constraints and split-based preconditioning
Dmitry Karpeyev; Derek Gaston; Jason Hales; Steven Novascone
2014-03-01T23:59:59.000Z
An accurate implementation of glued mechanical contact was developed in MOOSE based on its Constraint system. This approach results in a superior convergence of elastic structure problems, in particular in BISON. Adaptation of this technique to frictionless and frictional contact models is under way. Additionally, the improved convergence of elastic problems results from the application of the split-based preconditioners to constraint-based systems. This yields a substantial increase in the robustness of elastic solvers when the number of nodes in contact is increased and/or the mesh is refined.
Gamma Ray Burst Constraints on Ultraviolet Lorentz Invariance Violation
Tina Kahniashvili; Grigol Gogoberidze; Bharat Ratra
2006-10-20T23:59:59.000Z
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).
Testing the bootstrap constraints in the strange sector
K. Semenov-Tian-Shansky; V. Vereshagin
2013-04-04T23:59:59.000Z
In this paper the bootstrap conditions that follow from the general postulates of effective scattering theory (EST) are checked in the strange sector. We construct the system of tree level bootstrap constraints for the renormalization prescriptions fixing the physical content of the theory. Then we perform the numerical testing of corresponding sum rules for the parameters of strange resonances. It is shown that, generally, the bootstrap constraints turn out consistent with presently known data on the strange resonance parameters. At the same time we point out few sum rules which cannot be saturated with modern data and discuss the possible reasons for such discrepancies.
M. Leclerc
2012-11-18T23:59:59.000Z
We introduce a symmetric Poisson bracket that allows us to describe anticommuting fields on a classical level in the same way as commuting fields, without the use of Grassmann variables. By means of a simple example, we show how the Dirac bracket for the elimination of the second class constraints can be introduced, how the classical Hamiltonian equations can be derived and how quantization can be achieved through a direct correspondence principle. Finally, we show that the semiclassical limit of the corresponding Schroedinger equation leads back to the Hamilton-Jacobi equation of the classical theory. Summarizing, it is shown that the relations between classical and quantum theory are valid for fermionic fields in exactly the same way as in the bosonic case, and that there is no need to introduce anticommuting variables on a classical level.
Cabella, Paolo; Silk, Joseph [University of Oxford, Astrophysics, Keble Road, Oxford, OX1 3RH (United Kingdom); Natoli, Paolo [Dipartimento di Fisica e sezione INFN, Universita di Roma 'Tor Vergata', Via della Ricerca Scientifica, I-00133 Rome (Italy)
2007-12-15T23:59:59.000Z
We perform a wavelet analysis of the temperature and polarization maps of the cosmic microwave background (CMB) delivered by the Wilkinson Microwave Anisotropy Probe experiment in search for a parity-violating signal. Such a signal could be seeded by new physics beyond the standard model, for which the Lorentz and CPT symmetries may not hold. Under these circumstances, the linear polarization direction of a CMB photon may get rotated during its cosmological journey, a phenomenon also called cosmological birefringence. Recently, Feng et al. have analyzed a subset of the Wilkinson Microwave Anisotropy Probe and BOOMERanG 2003 angular power spectra of the CMB, deriving a constraint that mildly favors a nonzero rotation. By using wavelet transforms we set a tighter limit on the CMB photon rotation angle {delta}{alpha}=-2.5{+-}3.0 ({delta}{alpha}=-2.5{+-}6.0) at the one (two) {sigma} level, consistent with a null detection.
Description of quantum coherence in thermodynamic processes requires constraints beyond free energy
Matteo Lostaglio; David Jennings; Terry Rudolph
2015-03-16T23:59:59.000Z
Recent studies have developed fundamental limitations on nanoscale thermodynamics, in terms of a set of independent free energy relations. Here we show that free energy relations cannot properly describe quantum coherence in thermodynamic processes. By casting time-asymmetry as a quantifiable, fundamental resource of a quantum state we arrive at an additional, independent set of thermodynamic constraints that naturally extend the existing ones. These asymmetry relations reveal that the traditional Szilard engine argument does not extend automatically to quantum coherences, but instead only relational coherences in a multipartite scenario can contribute to thermodynamic work. We find that coherence transformations are always irreversible. Our results also reveal additional structural parallels between thermodynamics and the theory of entanglement.
Using novelty-biased GA to sample diversity in graphs satisfying constraints
Overbury, Peter
2015-01-01T23:59:59.000Z
The structure of the network underlying many complex systems, whether artificial or natural, plays a significant role in how these systems operate. As a result, much emphasis has been placed on accurately describing networks using network theoretic metrics. When it comes to generating networks with similar properties, however, the set of available techniques and properties that can be controlled for remains limited. Further, whilst it is becoming clear that some of the metrics currently used to control the generation of such networks are not very prescriptive so that networks could potentially exhibit very different higher-order structure within those constraints, network generating algorithms typically produce fairly contrived networks and lack mechanisms by which to systematically explore the space of network solutions. In this paper, we explore the potential of a multi-objective novelty-biased GA to provide a viable alternative to these algorithms. We believe our results provide the first proof of principl...
G. L. Fogli; E. Lisi; A. Marrone; A. Melchiorri; A. Palazzo; P. Serra; J. Silk
2004-11-17T23:59:59.000Z
In the context of three-flavor neutrino mixing, we present a thorough study of the phenomenological constraints applicable to three observables sensitive to absolute neutrino masses: The effective neutrino mass in Tritium beta decay (m_beta); the effective Majorana neutrino mass in neutrinoless double beta decay (m_2beta); and the sum of neutrino masses in cosmology (Sigma). We discuss the correlations among these variables which arise from the combination of all the available neutrino oscillation data, in both normal and inverse neutrino mass hierarchy. We set upper limits on m_beta by combining updated results from the Mainz and Troitsk experiments. We also consider the latest results on m_2beta from the Heidelberg-Moscow experiment, both with and without the lower bound claimed by such experiment. We derive upper limits on Sigma from an updated combination of data from the Wilkinson Microwave Anisotropy Probe (WMAP) satellite and the 2 degrees Fields (2dF) Galaxy Redshifts Survey, with and without Lyman-alpha forest data from the Sloan Digital Sky Survey (SDSS), in models with a non-zero running of the spectral index of primordial inflationary perturbations. The results are discussed in terms of two-dimensional projections of the globally allowed region in the (m_beta,m_2beta,Sigma) parameter space, which neatly show the relative impact of each data set. In particular, the (in)compatibility between Sigma and m_2beta constraints is highlighted for various combinations of data. We also briefly discuss how future neutrino data (both oscillatory and non-oscillatory) can further probe the currently allowed regions.
USER INTERACTION WITH CAD MODELS WITH NONHOLONOMIC PARAMETRIC SURFACE CONSTRAINTS
Utah, University of
during the early, formulative design stages into kinematic and dynamic characteristics of a mechanism. We is an interesting case that can come up in kinematic and dynamic analysis of knee or spatial cam mechanisms present the advan- tages of kinematic representation of constraint equations in fully Cartesian
Generating subtour constraints for the TSP from pure integer solutions
2015-03-08T23:59:59.000Z
distances d for every edge, the TSP asks for a shortest tour through all vertices with respect to the ... (or none at all), and identifies violated subtour constraints as cutting planes in the so- .... ferences in running time (up to a factor of 5). This is an
Reaction Temperature Constraints in DNA Computing Russell Deaton
Deaton, Russell J.
Reaction Temperature Constraints in DNA Computing Russell Deaton The Department of Electrical the thermodynamics of DNA melt- ing, a technique is proposed to choose a re- action temperature for the DNA computa the melting temperature, Tm. The melting temperature is determined from curves of UV absorbance versus
Kalman Filter Constraint Switching for Turbofan Engine Health Estimation
Simon, Dan
Kalman Filter Constraint Switching for Turbofan Engine Health Estimation Dan Simon Cleveland State Cleveland, Ohio, 44135 Abstract Kalman filters are often used to estimate the state variables of a dynamic system. However, in the application of Kalman filters some known signal information is often either
Kalman Filtering with Inequality Constraints for Turbofan Engine Health Estimation
Simon, Dan
Kalman Filtering with Inequality Constraints for Turbofan Engine Health Estimation ¤ Dan Simon, OH 44115 Cleveland, OH 44135 Abstract Kalman ¯lters are often used to estimate the state variables of a dynamic system. However, in the application of Kalman ¯lters some known signal information is often either
Mining Closed Relational Graphs with Connectivity Constraints X. Jasmine Zhou
Zhou, Xianghong Jasmine
Mining Closed Relational Graphs with Connectivity Constraints Xifeng Yan X. Jasmine Zhou Jiawei Han relational graphs, how to mine frequent highly connected subgraphs from it? ... G1 G2 Gn pattern Figure 1. Mining Massive Relational Graphs This new problem setting has three major characteristics different from
Asynchronous Forward-Bounding for Distributed Constraints Optimization
Meisels, Amnon
and Bound scheme. Agents extend a partial solution as long as the lower bound on its cost, does not exceed the bounds on the cost of solutions by sending copies of the partial assignment to all unas- signed agents, attempting to generate a solution that is globally optimal with respect to the costs of constraints between
Jitter Regulation in an Internet Router with Delay Constraint
Imai, Hiroshi
Jitter Regulation in an Internet Router with Delay Constraint Hisashi Koga Fujitsu Laboratories Ltd To playback multimedia data smoothly via the worldwide Internet, jitter, the variability of delay of individual packets, must be kept low. We examine online algorithms in a router to regulate jitter
A Constraint Programming Approach to the Stable Marriage Problem
Gent, I.P.; Irving, R.W.
Gent,I.P. Irving,R.W. Manlove,D.F. Prosser,P. Smith,B.M. Proceedings of CP 2001: The 7th International Conference on Principles and Practice of Constraint Programming, volume 2239 of Lecture Notes in Computer Science pp 225-239 Springer Verlag
A Constraint Programming Approach to the Hospitals / Residents Problem
Manlove, D.F.
Manlove,D.F. O'Malley,G. Prosser,P. Unsworth,C. Proceedings of CP-AI-OR '07: the Fourth International Conference on Integration of AI and OR Techniques in Constraint Programming for Combinatorial Optimization Problems, volume 4510 of Lecture Notes in Computer Science pp 155-170 Springer
Information Structure Constraints and Complex NP Islands in Chinese
treatments of CNPC in terms of movement constraints fail to predict the interpretational distinctiveness-phrases and semantic interpretation. The rest of this paper will be structured as follows: Section 2 reviews the core islands, couched in the transformational framework, and discusses their shortcomings; Section 4 examines
Constraint Management in Fuel Cells: A Fast Reference Governor Approach
Stefanopoulou, Anna
admissible current demand to the fuel cell based on on-line optimization of a scalar parameter and onConstraint Management in Fuel Cells: A Fast Reference Governor Approach Ardalan Vahidi Ilya Kolmanovsky Anna Stefanopoulou Abstract-- The air supply system in a fuel cell may be susceptible
Motion Planning for an Omnidirectional Robot with Steering Constraints
Kabanza, Froduald
to control the kinematics of a wheeled omnidirectional robot. For AZIMUT, we chose to model the velocityMotion Planning for an Omnidirectional Robot with Steering Constraints Simon Chamberland, Éric manoeuvrability in natural environments. Modeling the kinematics of such robots is a challenging problem
1 Designing Constraint Logic Programming Languages using Computational Systems
Vittek, Marian
1 Designing Constraint Logic Programming Languages using Computational Systems Claude Kirchner, H'el`ene Kirchner and Marian Vittek 1.1 Abstract This work presents computational systems, a framework as computational systems. We thus get a framework in which rewriting techniques can be used to reason about
New constraints on the Slate Islands impact structure, Ontario, Canada
Herrick, Robert R.
New constraints on the Slate Islands impact structure, Ontario, Canada Virgil L. Sharpton Lunar, Canada John Scott ABSTRACT The Slate Islands in northern Lake Superior represent the eroded remains constrained. INTRODUCTION The Slate Islands are an 7-km-wide archipelago located in northern Lake Superior 10
Inter-instance Nogood Learning in Constraint Programming
Stuckey, Peter J.
is a powerful approach to reducing search in Constraint Programming. This is achieved by recording sets. This dramatically reduces the search and provides orders of magnitude speedups on a wide range of problems. Current learned from one problem can be retained and used to significantly speed up the solution of other, similar
Inter-problem Nogood Learning in Constraint Programming
Stuckey, Peter J.
of the value of each variable in the old solution and reuses it as a search heuristic, can be effective is a powerful approach to reducing search in Constraint Programming. This is achieved by recording sets. This dramatically reduces the search and provides orders of magnitude speedups on a wide range of problems. Current
Generating Circuit Current Constraints to Guarantee Power Grid Safety
Najm, Farid N.
Generating Circuit Current Constraints to Guarantee Power Grid Safety Zahi Moudallal ECE Dept, as well as power grid-aware placement and floorplanning. We give a rigorous problem definition and develop of power grids is a necessity in modern chip design. We will use the term "power grid" to refer to either
Generalizing Itemset Mining in a Constraint Programming Setting
Boulicaut, Jean-François
Generalizing Itemset Mining in a Constraint Programming Setting J´er´emy Besson, Jean proposed for finding set patterns in boolean data. This includes popular mining tasks based on Universiteit Leuven, Celestijnenlaan 200A, B-3001 Leuven, Belgium e-mail: tias.guns@cs.kuleuven.be Siegfried
Infinite Runs in Weighted Timed Automata with Energy Constraints
Doyen, Laurent
Infinite Runs in Weighted Timed Automata with Energy Constraints Patricia Bouyer1 , Uli Fahrenberg2 Cachan, France {bouyer,markey}@lsv.ens-cachan.fr 2 Dept. of Computer Science, Aalborg University, Denmark and negative weights on transitions and locations, corresponding to the production and consumption of some
Constraint Orientated Specification with CSP and Real Time Temporal Logic
Kent, University of
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
Financial Constraints and Foreign Market Entries or Exits
Financial Constraints and Foreign Market Entries or Exits: Firm Level Evidence from France Philippe entries and massive exits in/from new destinations. For example in France, from 2000 to 2007, whereas net contributions are almost twice as big as the contributions of ...rms entries and exits from existing
Optimal linear control systems with input derivative constraints
Moore, John Barratt
. Optimal linear control systems with input derivative constraints J. B. Moore, Ph. D., and Prof. B-loss-function minimisation problem is linear. The "paper applies the results of this optimal control theory to a class of performance desired. For linear, finite-dimensional, completely controllable systems, Kalmanl has shown
Identifying Redundant Linear Constraints in Systems of Linear ...
2006-06-22T23:59:59.000Z
Jun 22, 2006 ... redundant linear constraints from the system (2.1) and (2.2). ... It is informative to note that in the above theorem, the optimal ..... S. Boyd and L. El Ghaoui, “Linear Matrix Inequalities in System and Control Theory”, SIAM, vol.
The Brain's "New" Science: Psychology, Neurophysiology, and Constraint*
Hatfield, Gary
The Brain's "New" Science: Psychology, Neurophysiology, and Constraint* Gary Hatfield University that brain science will or should provide for any future possible psychological theories. Hempel (1949 behavior and brain states. Quine (1974) maintained that mentalistic talk could be tolerated in psychology
Constraint-Based Hardware Synthesis Andrea Triossi1
Orlando, Salvatore
Constraint-Based Hardware Synthesis Andrea Triossi1 , Salvatore Orlando1 , Alessandra Raffaet`a1-level hardware description environment which aims at re- ducing the gap between application design and the well-established hardware description frameworks. Our motivations rise from an explicit demand for design representation lan
Finite Horizon Online Packet Scheduling with Energy and Delay Constraints
Uysal-Biyikoglu, Elif
with complete prior knowledge of data/energy/channel variations, which is rarely a practical assumption, while with data arrival and deadline constraints (e.g., [1], [2], [3], [4]) as well as in- termittent energy little to suggest good online policies. On the other hand, direct online formulations have been
White dwarfs constraints on dark sector models with light particles
Ubaldi, Lorenzo [Physikalisches Institut der Universität Bonn, Nussallee 12, D-53115 Bonn (Germany)
2014-06-24T23:59:59.000Z
The white dwarf luminosity function is well understood in terms of standard model physics and leaves little room for exotic cooling mechanisms related to the possible existence of new weakly interacting light particles. This puts significant constraints on the parameter space of models that contain a massive dark photon and light dark sector particles.
Constraints on massive gravity theory from big bang nucleosynthesis
G. Lambiase
2012-08-27T23:59:59.000Z
The massive gravity cosmology is studied in the scenario of big bang nucleosynthesis. By making use of current bounds on the deviation from the fractional mass, we derive the constraints on the free parameters of the theory. The cosmological consequences of the model are also discussed in the framework of the PAMELA experiment.
Constraints on the density perturbation spectrum from primordial black holes
Anne M Green; Andrew R Liddle
1997-04-25T23:59:59.000Z
We re-examine the constraints on the density perturbation spectrum, including its spectral index $n$, from the production of primordial black holes. The standard cosmology, where the Universe is radiation dominated from the end of inflation up until the recent past, was studied by Carr, Gilbert and Lidsey; we correct two errors in their derivation and find a significantly stronger constraint than they did, $n \\lesssim 1.25$ rather than their 1.5. We then consider an alternative cosmology in which a second period of inflation, known as thermal inflation and designed to solve additional relic over-density problems, occurs at a lower energy scale than the main inflationary period. In that case, the constraint weakens to $n \\lesssim 1.3$, and thermal inflation also leads to a `missing mass' range, $10^{18} g \\lesssim M \\lesssim 10^{26} g$, in which primordial black holes cannot form. Finally, we discuss the effect of allowing for the expected non-gaussianity in the density perturbations predicted by Bullock and Primack, which can weaken the constraints further by up to 0.05.
Optimal control of a gasolinefueled car engine under pollution constraint
Bonnans, Frédéric
Optimal control of a gasolinefueled car engine under pollution constraint J. Fr'ed'eric Bonnans mass / air mass stoichiometric : Here, ``stoichiometric'' means that the combustion is complete pollutants that are stored. In addition, the tank size depends highly on temperature. The device does
Wind Farm Portfolio Optimization under Network Capacity Constraints
Paris-Sud XI, Université de
1 Wind Farm Portfolio Optimization under Network Capacity Constraints H´el`ene Le Cadre, Anthony of wind farms in a Market Coupling organization, for two Market Designs (exogenous prices and endogenous of efficient wind farm portfolios, is derived theoretically as a function of the number of wind farms
WORKING PAPER N 2011 25 Capital misallocation and credit constraints
Paris-Sud XI, Université de
, resources misallocation PARIS-JOURDAN SCIENCES ECONOMIQUES 48, BD JOURDAN E.N.S. 75014 PARIS TÉL. : 33 decrease of domestic credit and an investment slack. I find direct support for the theoret- ical model, credit constraints, resources misallocation. JEL classification: E22, O16, Q54 PhD Candidate, Paris
On the Expressive Power of Temporal Concurrent Constraint Programming Languages
Valencia, Frank D.
On the Expressive Power of Temporal Concurrent Constraint Programming Languages Mogens Nielsen behavior have been proposed in the literature. In this paper we study the expressive power of some programming, timed systems, expressiveness The contribution of Mogens Nielsen and Frank D. Valen- cia
Active constraint regions for optimal operation of distillation columns
Skogestad, Sigurd
Active constraint regions for optimal operation of distillation columns Magnus G. Jacobsen the control structure of distillation columns, with optimal operation in mind, it is important to know how for distillation columns change with variations in energy cost and feed flow rate. The production of the most
Optimal Control of Linear Systems with State Equality Constraints
Bitmead, Bob
system specifications. Recently, a number of modern model- based control design methods seek to dealOptimal Control of Linear Systems with State Equality Constraints Sangho Ko and Robert R. Bitmead and control community, since it is closely connected with system performance and, thus, fulfillment of given
Temporal Conditions and Integrity Constraints in Active Database Systems \\Lambda
Wolfson, Ouri E.
to specify conditions that involve both, events and database states, and their evolution over time. BasicallyTemporal Conditions and Integrity Constraints in Active Database Systems \\Lambda A. Prasad Sistla, for specifying conditions and events in the rules for active database sys tem. This language permits
OPTIMAL DISTRIBUTED POWER GENERATION UNDER NETWORK LOAD CONSTRAINTS,
Frank, Jason
OPTIMAL DISTRIBUTED POWER GENERATION UNDER NETWORK LOAD CONSTRAINTS, MARJAN VAN DEN AKKER, GABRI of novel components for decentral power generation (solar panels, small wind turbines and heat pumps). This gives rise to the question how many units of each type (solar panel, small wind turbine or central
Constraints on the polarization purity of a Stokes microwave radiometer
Ruf, Christopher
Constraints on the polarization purity of a Stokes microwave radiometer Christopher S. Ruf of the third and fourth Stokes parameters of microwave thermal emission can be degraded by nonideal radiometer of microwave emission by the ocean surface identified wind direc- tion as the cause [Bespalova et al., 1982
Constraints on power spectrum of density fluctuations from PBH evaporations
Edgar Bugaev; Peter Klimai
2006-12-21T23:59:59.000Z
We calculate neutrino and photon energy spectra in extragalactic space from evaporation of primordial black holes, assuming that the power spectrum of primordial density fluctuations has a strong bump in the region of small scales. The constraints on the parameters of this bump based on neutrino and photon cosmic background data are obtained.
Component-based Specification of Software Architecture Constraints
Paris-Sud XI, Université de
engineering provides for develop- ers the ability to easily reuse and assemble software entities to build phase of the software lifecycle. They propose to de- velopers to explicit, in a structured way, designComponent-based Specification of Software Architecture Constraints Chouki Tibermacine LIRMM, CNRS
Enforcing Architecture and Deployment Constraints of Distributed Component-based
Paris-Sud XI, Université de
.kadri@alkante.com In the component-based software development process, the formalisation of architectural choices makes possible Introduction Architectural choices should be preserved throughout the software lifecycle soEnforcing Architecture and Deployment Constraints of Distributed Component-based Software Chouki
Lung Segmentation from CT with Severe Pathologies Using Anatomical Constraints
Lung Segmentation from CT with Severe Pathologies Using Anatomical Constraints Neil Birkbeck Healthcare, Oxford, UK Abstract. The diversity in appearance of diseased lung tissue makes automatic segmentation of lungs from CT with severe pathologies chal- lenging. To overcome this challenge, we rely
Thermal Unit Commitment Including Optimal AC Power Flow Constraints
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
Ensemble climate predictions using climate models and observational constraints
REVIEW Ensemble climate predictions using climate models and observational constraints BY PETER A. STOTT 1,* AND CHRIS E. FOREST 2 1 Hadley Centre for Climate Change (Reading Unit), Meteorology Building for constraining climate predictions based on observations of past climate change. The first uses large ensembles
Safe Approximations of Chance Constraints Using Historical Data
2015-01-11T23:59:59.000Z
constraint, where random perturbations belong to a collection of distributions in a given con- ...... stresses on different points of the tube and if the temperature is too high, it will scrap the tube due ..... [10] W. Chen, M. Sim, J. Sun, and C.P. Teo.
Automatic Synthesis of Computation Interference Constraints for Relative Timing Verification
Stevens, Ken
systems results in circuits much larger, slower, and power hungry than similar timed circuits [2]. Even to reduce the complexity of such joint behavior and metric timed verification systems. Another problemAutomatic Synthesis of Computation Interference Constraints for Relative Timing Verification Yang
Approximate Dynamic Programming for Networks: Fluid Models and Constraint Reduction
Veatch, Michael H.
of approximating functions for the differential cost. The first contribution of this paper is identifying new or piece-wise quadratic. Fluid cost has been used to initialize the value iteration algorithm [5Approximate Dynamic Programming for Networks: Fluid Models and Constraint Reduction Michael H
Two stage stochastic equilibrium problems with equilibrium constraints
2010-08-12T23:59:59.000Z
Aug 12, 2010 ... Monte Carlo sampling method is applied to solve the SEPEC. ... EPEC models, has a number of potential applications in a wide domain in engineering design, ... mathematical program with equilibrium constraints (MPEC), and introduced a ...... past data or computer simulation, and a particular numerical ...
Renewable Energy Scheduling for Fading Channels with Maximum Power Constraint
Greenberg, Albert
Renewable Energy Scheduling for Fading Channels with Maximum Power Constraint Zhe Wang Electrical--In this paper, we develop efficient algorithm to obtain the optimal energy schedule for fading channel with energy harvesting. We assume that the side information of both the channel states and energy harvesting
A Dynamic Distributed Constraint Satisfaction Approach to Resource Allocation
Modi, Jay
A Dynamic Distributed Constraint Satisfaction Approach to Resource Allocation Pragnesh Jay Modi,jungh,tambe,shen,kulkarnig@isi.edu Abstract. In distributed resource allocation a set of agents must assign their re sources to a set and the domain described in this paper: distributed sensor networks. Despite the variety of approaches proposed
A Dynamic Distributed Constraint Satisfaction Approach to Resource Allocation
Modi, Jay
A Dynamic Distributed Constraint Satisfaction Approach to Resource Allocation Pragnesh Jay Modi.edu Abstract. In distributed resource allocation a set of agents must assign their re- sources to a set and the domain described in this paper: distributed sensor networks. Despite the variety of approaches proposed
QER Public Meeting: New England Regional Infrastructure Constraints Part II
Broader source: Energy.gov [DOE]
The Department of Energy will convene a public meeting to discuss and receive comments on issues related to the Quadrennial Energy Review. The purpose of the meeting is to examine energy infrastructure constraints in New England and regional approaches to addressing them
QER Public Meeting: New England Regional Infrastructure Constraints Part I
Broader source: Energy.gov [DOE]
The Department of Energy will convene a public meeting to discuss and receive comments on issues related to the Quadrennial Energy Review. The purpose of the meeting is to examine energy infrastructure constraints in New England and regional approaches to addressing them
Coordination of Multiple Non-Holonomic Agents with Input Constraints
Loizou, Savvas G.
-aircraft systems modeled as hybrid systems. With the advent of powerful formal verification tools, there has been with aircraft-like kinematic constraints. A model of a system of input-constrained non- holonomic agents by Belta et al. in [10]. In this paper, a discrete model of a system with input- constrained non
3 LINCS: a linear constraint solver for molecular simulations
Bekker, Henk
algorithms have been proposed, including the EEM method of Edberg et al. [30] who applied a penalty func- tion, a modification of EEM by Baranyai and Evans [31] applying damping corrections and the 'non with bond constraints. LINCS is similar to EEM with a few practical dif- ferences. We have implemented
Neutron star cooling: theoretical aspects and observational constraints
Neutron star cooling: theoretical aspects and observational constraints D.G. Yakovlev a,*, O 2003 Abstract The cooling theory of isolated neutron stars is reviewed. The main cooling regulators of supranuclear matter in neutron star interiors by confronting cooling theory with observations of isolated
Fundamental Limits to Cellular Sensing
Pieter Rein ten Wolde; Nils B. Becker; Thomas E. Ouldridge; A. Mugler
2015-05-25T23:59:59.000Z
In recent years experiments have demonstrated that living cells can measure low chemical concentrations with high precision, and much progress has been made in understanding what sets the fundamental limit to the precision of chemical sensing. Chemical concentration measurements start with the binding of ligand molecules to receptor proteins, which is an inherently noisy process, especially at low concentrations. The signaling networks that transmit the information on the ligand concentration from the receptors into the cell have to filter this noise extrinsic to the cell as much as possible. These networks, however, are also stochastic in nature, which means that they will also add noise to the transmitted signal. In this review, we will first discuss how the diffusive transport and binding of ligand to the receptor sets the receptor correlation time, and then how downstream signaling pathways integrate the noise in the receptor state; we will discuss how the number of receptors, the receptor correlation time, and the effective integration time together set a fundamental limit on the precision of sensing. We then discuss how cells can remove the receptor noise while simultaneously suppressing the intrinsic noise in the signaling network. We describe why this mechanism of time integration requires three classes of resources---receptors and their integration time, readout molecules, energy---and how each resource class sets a fundamental sensing limit. We also briefly discuss the scheme of maximum-likelihood estimation, the role of receptor cooperativity, and how cellular copy protocols differ from canonical copy protocols typically considered in the computational literature, explaining why cellular sensing systems can never reach the Landauer limit on the optimal trade-off between accuracy and energetic cost.
Modular Invariant Soft Breaking, WMAP, Dark Matter and Sparticle Mass Limits
Chattopadhyay, Utpal; Chattopadhyay, Utpal; Nath, Pran
2004-01-01T23:59:59.000Z
An analysis of soft breaking under the constraint of modular invariance is given. The role of dilaton and moduli dependent front factors in achieving a modular invariant $V_{soft}$ is emphasized. Further, it is shown that in string models $\\tan\\beta$ is no longer a free parameter but is determined in terms of $\\alpha_{string}$ and the other soft parameters by the constraints of modular invariance and radiative electroweak symmetry breaking. The above framework is then used to analyze the neutralino relic density consistent with the WMAP data at self dual points in the Kahler and complex structure moduli. One finds that the combined set of constraints arising from modular invariant soft breaking, radiative electroweak symmetry breaking and WMAP lead to upper limits on sparticle masses for $\\mu>0$. These limits are investigated for a class of models and found to lie within reach of the Tevatron and of the Large Hadron Collider (LHC). Further, an analysis of the neutralino-proton cross section shows that dark ma...
Limiting two-Higgs-doublet models
Chun, Eung Jin
2015-01-01T23:59:59.000Z
Updating various theoretical and experimental constraints on the four different types of two-Higgs-doublet models (2HDMs), we find that only the "lepton-specific" (or "type X") 2HDM can explain the present muon (g-2) anomaly in the parameter region of large $\\tan\\beta$, a light CP-odd Higgs boson, and heavier CP-even and charged Higgs bosons which are almost degenerate. The severe constraints on the models come mainly from the consideration of vacuum stability and perturbativity, the electroweak precision data, $B$ physics observables like $b\\to s \\gamma$ as well as the 125 GeV Higgs boson properties measured at the LHC.
Gradient limits and SCRF performance.
Norem, J.; Pellin, M.
2007-01-01T23:59:59.000Z
Superconducting rf gradients are limited by a number of mechanisms, among them are field emission, multipactor, Lorentz detuning, global and local heating, quench fields, Q-Slope, assembly defects, and overall power use. We describe how each of these mechanisms interacts with the cavity fields and show how significant improvements may be possible assuming improvements in control over the cavity surface. New techniques such as Atomic Layer Deposition (ALD), the use of layered composites, Gas Cluster Ion Beam (GCIB) smoothing and Dry Ice Cleaning (DIC) have been proposed as ways to control the surface.
Novacem Limited | Open Energy Information
AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on DeliciousPlasmaP a g eWorks -09-0018-CX JumpShunMontpelier,NantongNishnabotnaNorthwest SEEDAlincaNovacem Limited Jump
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Hestiun Limited | Open Energy Information
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Diffraction limited focusing and routing
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AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel), 2002; Level:5 TablesExports to3,1,50022,3,,0,,6,1,Separation 23TribalInformationConference:(JournalTowards(Conference) |properties.Patent:Connectmice limited
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West, Stuart
Y Keywords: adaptation; artificial neural networks; evolutionary constraints; parasitoid; sex ratio by modelling information acquisition and processing using artificial neural networks (ANNs) evolving accordingConstraints on adaptation: explaining deviation from optimal sex ratio using artificial neural
Dominion: An Architecture-driven Approach to Generating Efficient Constraint Solvers
Miguel, Ian
mathematics and the petrochemical and steel industries [1]. Constraint solving of a combinatorial problem efficient solving process. To mitigate these drawbacks, constraint solvers often allow manual tuning of the solving process. However, this requires considerable expertise, preventing the widespread adoption
Mitchell, John E.
A semidefinite programming heuristic for quadratic programming problems with complementarity of complementarity constraints brings a combinatorial flavour to an optimization problem. A quadratic programming problem with com- plementarity constraints can be relaxed to give a semidefinite programming problem
Mitchell, John E.
A semidefinite programming heuristic for quadratic programming problems with complementarity of complementarity constraints brings a combinatorial flavour to an optimization problem. A quadratic programming problem with comÂ plementarity constraints can be relaxed to give a semidefinite programming problem
A multivariate spatial interpolation of airborne -ray data using the geological constraints
Roma "La Sapienza", Università di
A multivariate spatial interpolation of airborne -ray data using the geological constraints Enrico: Multivariate analysis Airborne -ray spectrometry Collocated cokriging interpolator Elba Island Natural (Italy) obtained with a multivariate spatial interpolation of airborne -ray data using the constraints
ICLP 2014 1 A Proof Theoretic Study of Soft Concurrent Constraint
Nigam, Vivek
for defining constraint systems where agents are allowed to tell7 and ask soft constraints. Nevertheless a declarative reading of processes as formulas while providing a logical framework13 for soft-CCP based systems systems) to soft-co
Fermi Large Area Telescope Constraints on the Gamma-ray Opacity...
Office of Scientific and Technical Information (OSTI)
Large Area Telescope Constraints on the Gamma-ray Opacity of the Universe Citation Details In-Document Search Title: Fermi Large Area Telescope Constraints on the Gamma-ray Opacity...
de Weck, Olivier L.
Climate Policy Design: Interactions among Carbon Dioxide, Methane, and Urban Air Pollution Policy Design: Interactions among Carbon Dioxide, Methane, and Urban Air Pollution Constraints by Marcus. The third case examines the benefits of increased policy coordination between air pollution constraints
Realtime Constraint-Based Cinematography for Complex Interactive 3D Worlds
Lester, James C.
, creates cinematic goals for a constraint- based realtime 3D virtual cinematography plan- ner. As interactive narratives unfold, a cinematic goal selector creates view constraints to lm the most salient
Double Auctions, Ex-Post Participation Constraints, and the Hold-Up Problem
Troger, Thomas
2002-01-01T23:59:59.000Z
Double Auctions, Ex-Post Participation Constraints, and theFirstly, we demonstrate how ex-post negotiations via doubleSecondly, we show that ex-post participation constraints
Toward an understanding of when and why situational constraints influence performance
Horner, Margaret Tutt
2009-05-15T23:59:59.000Z
Page Table 1 Terms and Definitions for Situational Constraints Used Throughout the Literature ........................................................ 6 Table 2 Situational Constraint Categories and Definitions From Peters et al. (1985... constraints or aspects of the work setting beyond the employee?s control that hinder performance (e.g., lack of job-related information needed to perform the job; Peters & O?Connor, 1980). However, the reasons why situational constraints adversely affect...
Towards an Optimal Approach to Soft Constraint Problems Martine Ceberio and Vladik Kreinovich
Kreinovich, Vladik
to find a design that satisfies a given finite set of inequality/equalityÂtype constraints. The corre
Towards an Optimal Approach to Soft Constraint Problems Martine Ceberio and Vladik Kreinovich
Kreinovich, Vladik
that satisfies a given finite set of inequality/equality-type constraints. The corre- sponding problem is called
Extending clp(FD) by Negative Constraint Solving Antonio J. Fern andez and Patricia M. Hill
Hill, Patricia
and new methods for their propagation. Keywords: Constraint Solving, Constraint Propagation, Labeling several processes: constraint propagation, consistency checks, and labeling (also called enumeration is with School of Computer Studies,University of Leeds, England. Email: hill@scs.leeds.ac.uk This work was partly
Constraint Based Planning with Composable Substate Peter Gregory and Derek Long and Maria Fox
Hammerton, James
Constraint Based Planning with Composable Substate Graphs Peter Gregory and Derek Long and Maria a constraint-based model for cost-optimal plan- ning that uses global constraints to improve the inference to such problems combine search, inference and relaxation. In cost optimal planning, search and relaxation tech
http://www.jstor.org Modeling Global Macroclimatic Constraints on Ectotherm Energy Budgets
Grant, Bruce W.
http://www.jstor.org Modeling Global Macroclimatic Constraints on Ectotherm Energy Budgets Author:154-178 (1992) Modeling Global Macroclimatic Constraints on Ectotherm Energy Budgets1 Bruce W. Grant2 and Warren describe a mechanistic individual-based model of how global macroclimatic constraints affect the energy
On Secrecy Outage Capacity of Fading Channels Under Relaxed Delay Constraints
Koksal, Can Emre
On Secrecy Outage Capacity of Fading Channels Under Relaxed Delay Constraints Onur Gungor, Can Emre delay constraints. More specif- ically, we extend the definition of outage secrecy capacity for single, we provide bounds on secrecy outage capacity with k + 1 block delay constraint. We show
Haxton, W.C.; Hoeing, A. (Institute for Nuclear Theory, NK-12 and Department of Physics, FM-15, University of Washington, Seattle, Washington 98195 (United States)); Musolf, M.J. (Continuous Electron Beam Accelerator Facility Theory Group, MS 12H, Newport News, Virginia 23606 (United States) Department of Physics, Old Dominion University, Norfolk, Virigina 23529 (United States))
1994-09-01T23:59:59.000Z
We deduce constraints on time-reversal-noninvariant (TRNI), parity-conserving (PC) hadronic interactions from nucleon, nuclear, and atomic electric dipole moment (EDM) limits. Such interactions generate EDM's through weak radiative corrections. We consider long-range mechanisms, i.e., those mediated by meson exchanges in contrast with short-range two-loop mechanisms. We find that the ratio of typical TRNI, PC nuclear matrix elements to those of the strong interaction are [approx lt]10[sup [minus]5], a limit about 2 orders of magntiude more stringent than those from direct detailed balance studies of such interactions. This corresponds to a bound of [vert bar][ital [bar g
Momentum Trading and Limits to Arbitrage
Armstrong, William
2012-07-16T23:59:59.000Z
: : : : : : : : : : : : : : : : : : : : : : : : : : : : 36 4.4 Expected Momentum Pro ts : : : : : : : : : : : : : : : : : : : : : : : 41 4.5 Expected Growth Rates : : : : : : : : : : : : : : : : : : : : : : : : : 45 4.6 Short-Sale Constraints and Overvaluation : : : : : : : : : : : : : : : 50 5...-2010) : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 39 4.4 Expected Momentum Pro ts (1967-2010) : : : : : : : : : : : : : : : : : 43 4.5 Conditional Momentum Strategies and Firm Operating Performance (1967- 2010) : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 46 4...
Solar System Constraints on Gauss-Bonnet Mediated Dark Energy
Luca Amendola; Christos Charmousis; Stephen C. Davis
2007-10-02T23:59:59.000Z
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.
Future CMB cosmological constraints in a dark coupled universe
Matteo Martinelli; Laura Lopez Honorez; Alessandro Melchiorri; Olga Mena
2010-04-14T23:59:59.000Z
Cosmic Microwave Background satellite missions as the on-going Planck experiment are expected to provide the strongest constraints on a wide set of cosmological parameters. Those constraints, however, could be weakened when the assumption of a cosmological constant as the dark energy component is removed. Here we show that it will indeed be the case when there exists a coupling among the dark energy and the dark matter fluids. In particular, the expected errors on key parameters as the cold dark matter density and the angular diameter distance at decoupling are significantly larger when a dark coupling is introduced. We show that it will be the case also for future satellite missions as EPIC, unless CMB lensing extraction is performed.
Constraints on Neutrino Oscillations from Big Bang Nucleosynethesis
X. Shi; D. N. Schramm; B. D. Fields
1993-07-16T23:59:59.000Z
We discuss in detail the effect of neutrino oscillations in Big Bang nucleosynthesis, between active and sterile neutrinos, as well as between active and active neutrinos. We calculate the constraints on mixings between active and sterile neutrinos from the present observation of the primordial helium abundance and discuss the potential implications on various astrophysical and cosmological problems of such oscillations. In particular, we show that large angle sterile neutrino mixing seems to be excluded as a MSW solution to the solar neutrino situation or a solution to the atmospheric neutrino mixing hinted at in some underground experiments. We show how with this constraint, the next generation of solar neutrino experiments should be able to determine the resolution of the solar neutrino problem. It is also shown how sterile neutrinos remain a viable dark matter candidate.
Fine-structure constant constraints on dark energy
Martins, C J A P
2015-01-01T23:59:59.000Z
We use astrophysical and atomic clock tests of the stability of the fine-structure constant $\\alpha$, together with Type Ia supernova and Hubble parameter data, to constrain the simplest class of dynamical dark energy models where the same degree of freedom is assumed to provide both the dark energy and (through a dimensionless coupling, $\\zeta$, to the electromagnetic sector) the $\\alpha$ variation. We show how current data tightly constrains a combination of $\\zeta$ and the dark energy equation of state $w_0$. At the $95\\%$ confidence level and marginalizing over $w_0$ we find $|\\zeta|<5\\times10^{-6}$, with the atomic clock tests dominating the constraints. The forthcoming generation of high-resolution ultra-stable spectrographs will enable significantly tighter constraints.
Unit Commitment Considering Generation Flexibility and Environmental Constraints
Lu, Shuai; Makarov, Yuri V.; Zhu, Yunhua; Lu, Ning; Prakash Kumar, Nirupama; Chakrabarti, Bhujanga B.
2010-07-31T23:59:59.000Z
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.
Constraints on Axion Inflation from the Weak Gravity Conjecture
Rudelius, Tom
2015-01-01T23:59:59.000Z
We derive constraints facing models of axion inflation based on decay constant alignment from a string-theoretic and quantum gravitational perspective. In particular, we investigate the prospects for alignment and `anti-alignment' of $C_4$ axion decay constants in type IIB string theory, deriving a strict no-go result in the latter case. We discuss the relationship of axion decay constants to the weak gravity conjecture and demonstrate agreement between our string-theoretic constraints and those coming from the `generalized' weak gravity conjecture. Finally, we consider a particular model of decay constant alignment in which the potential of $C_4$ axions in type IIB compactifications on a Calabi-Yau three-fold is dominated by contributions from $D7$-branes, pointing out that this model evades some of the challenges derived earlier in our paper but is highly constrained by other geometric considerations.
Solar-System Constraints on f(R) Chameleon Gravity
Je-An Gu; Wei-Ting Lin
2011-08-08T23:59:59.000Z
We investigate the solar-system constraint on the f(R) theory of modified gravity with chameleon mechanism, where f(R) represents the deviation from general relativity in the gravity action. We obtain a stringent bound to a general, non-constant deviation function f(R): -10^{-15} 3*10^5*H0^2, by requiring the thin-shell condition in the solar system, particularly in the atmosphere of the Earth. These bounds can be conveniently utilized to test the f(R) models with given functional forms of f(R) and to obtain the constraints on the parameters therein. For demonstration we apply these bounds to several widely considered f(R) models. (H0: Hubble constant)
Constraints on light neutrino parameters derived from the study of neutrinoless double beta decay
Sabin Stoica; Andrei Neacsu
2014-05-02T23:59:59.000Z
The study of the neutrinoless double beta ($0 \\beta\\beta$) decay mode can provide us with important information on the neutrino properties, particularly on the electron neutrino absolute mass. In this work we revise the present constraints on the neutrino mass parameters derived from the $0 \\beta\\beta$ decay analysis of the experimentally interesting nuclei. We use the latest results for the phase space factors (PSFs) and nuclear matrix elements (NMEs), as well as for the experimental lifetimes limits. For the PSFs we use values computed with an improved method reported very recently. For the NMEs we use values chosen from literature on a case-by-case basis, taking advantage of the consensus reached by the community on several nuclear ingredients used in their calculation. Thus, we try to restrict the range of spread of the NME values calculated with di?erent methods and, hence, to reduce the uncertainty in deriving limits for the Majorana neutrino mass parameter. Our results may be useful to have an up-date image on the present neutrino mass sensitivities associated with $0 \\beta\\beta$ measurements for different isotopes and to better estimate the range of values of the neutrino masses that can be explored in the future double beta decay (DBD) experiments.
Milagro Constraints on Very High Energy Emission from Short Duration Gamma-Ray Bursts
Abdo, A A; Berley, D; Blaufuss, E; Casanova, S; Dingus, B L; Ellsworth, R W; González, M M; Goodman, J A; Hays, E; Hoffman, C M; Kolterman, B E; Lansdell, C P; Linnemann, J T; McEnery, J E; Mincer, A I; Némethy, P; Noyes, D; Ryan, J M; Samuelson, F W; Parkinson, P M Saz; Shoup, A; Sinnis, G; Smith, A J; Sullivan, G W; Vasileiou, V; Walker, G P; Williams, D A; Xu, X W; Yodh, G B
2007-01-01T23:59:59.000Z
Recent rapid localizations of short, hard gamma-ray bursts (GRBs) by the Swift and HETE satellites have led to the observation of the first afterglows and the measurement of the first redshifts from this type of burst. Detection of >100 GeV counterparts would place powerful constraints on GRB mechanisms. Seventeen short duration (100 GeV counterparts to these GRBs and find no significant emission correlated with these bursts. Due to the absorption of high-energy gamma rays by the extragalactic background light (EBL), detections are only expected for redshifts less than ~0.5. While most long duration GRBs occur at redshifts higher than 0.5, the opposite is thought to be true of short GRBs. Lack of a detected VHE signal thus allows setting meaningful fluence limits. One GRB in the sample (050509b) has a likely association with a galaxy at a redshift of 0.225, while another (051103) has been tentatively linked to the nearby galaxy M81. Fluence limits are corrected for EBL absorption, either using the known measu...
Milagro Constraints on Very High Energy Emission from Short Duration Gamma-Ray Bursts
A. A. Abdo; B. T. Allen; D. Berley; E. Blaufuss; S. Casanova; B. L. Dingus; R. W. Ellsworth; M. M. Gonzalez; J. A. Goodman; E. Hays; C. M. Hoffman; B. E. Kolterman; C. P. Lansdell; J. T. Linnemann; J. E. McEnery; A. I. Mincer; P. Nemethy; D. Noyes; J. M. Ryan; F. W. Samuelson; P. M. Saz Parkinson; A. Shoup; G. Sinnis; A. J. Smith; G. W. Sullivan; V. Vasileiou; G. P. Walker; D. A. Williams; X. W. Xu; G. B. Yodh
2007-05-10T23:59:59.000Z
Recent rapid localizations of short, hard gamma-ray bursts (GRBs) by the Swift and HETE satellites have led to the observation of the first afterglows and the measurement of the first redshifts from this type of burst. Detection of >100 GeV counterparts would place powerful constraints on GRB mechanisms. Seventeen short duration (100 GeV counterparts to these GRBs and find no significant emission correlated with these bursts. Due to the absorption of high-energy gamma rays by the extragalactic background light (EBL), detections are only expected for redshifts less than ~0.5. While most long duration GRBs occur at redshifts higher than 0.5, the opposite is thought to be true of short GRBs. Lack of a detected VHE signal thus allows setting meaningful fluence limits. One GRB in the sample (050509b) has a likely association with a galaxy at a redshift of 0.225, while another (051103) has been tentatively linked to the nearby galaxy M81. Fluence limits are corrected for EBL absorption, either using the known measured redshift, or computing the corresponding absorption for a redshift of 0.1 and 0.5, as well as for the case of z=0.
Constraints of Flat Spectrum Radio Quasars in the hadronic model: the case of 3C 273
Petropoulou, Maria
2015-01-01T23:59:59.000Z
We present a method of constraining the properties of the $\\gamma$-ray emitting region in flat spectrum radio quasars (FSRQs) in the one-zone proton synchrotron model, where the $\\gamma$-rays are produced by synchrotron radiation of relativistic protons. We show that for low enough values of the Doppler factor $\\delta$, the emission from the electromagnetic (EM) cascade which is initiated by the internal absorption of high-energy photons from photohadronic interactions may exceed the observed $\\sim$GeV flux. We use that effect to derive an absolute lower limit of $\\delta$; first, an analytical one, in the asymptotic limit where the external radiation from the broad line region (BLR) is negligible, and then a numerical one in the more general case that includes BLR radiation. As its energy density in the emission region depends on $\\delta$ and the region's distance from the galactic center, we use the EM cascade to determine a minimum distance for each value of $\\delta$. We complement the EM cascade constraint...
Solar System Constraints on Gauss-Bonnet Dark Energy
Stephen C. Davis
2007-08-15T23:59:59.000Z
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.
A void growth model relating fracture toughness and constraint
Miller, Timothy Clark
1992-01-01T23:59:59.000Z
, Hartwig (member) Dr, , K. Kinra (member) Dr. W, L. Bradley (Head of Department) August 1992 ABSTRACT A Void Model Relating Fracture Toughness and Constraint. (August 1992) Timothy Clark Miller, B. S. , Texas ARM University Chair of Advisory... bonded). 3 f" ) (a) particles (b) nucleation (c) void grovvtb (d) coalescence Figure 1. Void phenomena and ductile fracture of a metal (Ada@ed horn [11] ) (a) initial state (b) void growth at tip ~ ' ':. ~ . :; -. . e-"""", ? ' " (c...
Constraints on massive gravity theory from big bang nucleosynthesis
Lambiase, G., E-mail: lambiase@sa.infn.it [Dipartimento di Fisica 'E. R.Caianiello', Università di Salerno, 84081 Baronissi (Italy)
2012-10-01T23:59:59.000Z
The massive gravity cosmology is studied in the scenario of big bang nucleosynthesis. By making use of current bounds on the deviation from the fractional mass, we derive the constraints on the free parameters of the theory. The cosmological consequences of the model are also analyzed in the framework of the PAMELA experiment, i.e. an excess of positron events, that the conventional cosmology and particle physics cannot explain.
Merhav, Neri
2009-01-01T23:59:59.000Z
We provide a simple physical interpretation, in the context of the second law of thermodynamics, to the information inequality (a.k.a. the Gibbs' inequality, which is also equivalent to the log-sum inequality), asserting that the relative entropy between two probability distributions cannot be negative. Since this inequality stands at the basis of the data processing theorem (DPT), and the DPT in turn is at the heart of most, if not all, proofs of converse theorems in Shannon theory, it is observed that conceptually, the roots of fundamental limits of Information Theory can actually be attributed to the laws of physics, in particular, to the second law of thermodynamics, and at least indirectly, also to the law of energy conservation. By the same token, in the other direction: one can view the second law as stemming from information-theoretic principles.
Limited-life cartridge primers
Makowiecki, Daniel M.; Rosen, Robert S.
2005-04-19T23:59:59.000Z
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.
Limited-life cartridge primers
Makowiecki, Daniel M. (Livermore, CA); Rosen, Robert S. (San Ramon, CA)
1998-01-01T23:59:59.000Z
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.
Limited-life cartridge primers
Makowiecki, D.M.; Rosen, R.S.
1998-06-30T23:59:59.000Z
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.
Baringer, Philip S.
1987-05-01T23:59:59.000Z
was supported in part by the U.S. Depart- ment of Energy under Contracts Nos. W-31-109-Eng-38, DE-AC02-76ER011 12, DE-AC03-76S F000998, DE- AC02-76ER01428, and DE-AC02-84ER40125. This ex- periment was made possible by the support provided by the SLAC PEP staff... articles is followed, and page proofs are sent to authors. Tau-neutrino mass limit S. Abachi, P. Baringer, B. G. Bylsma, R. De Bonte, D. Koltick, F. J. Loeffler, E. H. Low, R. L. McIlwain, D. H. Miller, C. R. Ng, L. K. Rangan, and E. I. Shibata Purdue...
Baryon Oscillations and Dark-Energy Constraints from Imaging Surveys
Derek Dolney; Bhuvnesh Jain; Masahiro Takada
2004-09-20T23:59:59.000Z
Baryonic oscillations in the galaxy power spectrum have been studied as a way of probing dark-energy models. While most studies have focused on spectroscopic surveys at high redshift, large multi-color imaging surveys have already been planned for the near future. In view of this, we study the prospects for measuring baryonic oscillations from angular statistics of galaxies binned using photometric redshifts. We use the galaxy bispectrum in addition to the power spectrum; this allows us to measure and marginalize over possibly complex galaxy bias mechanisms to get robust cosmological constraints. In our parameter estimation we allow for a weakly nonlinear biasing scheme that may evolve with redshift by two bias parameters in each of ten redshift bins. We find that a multi-color imaging survey that probes redshifts beyond one can give interesting constraints on dark-energy parameters. In addition, the shape of the primordial power spectrum can be measured to better accuracy than with the CMB alone. We explore the impact of survey depth, area, and calibration errors in the photometric redshifts on dark-energy constraints.
Observational constraints on gauge field production in axion inflation
Meerburg, P.D. [Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08540 (United States); Pajer, E., E-mail: meerburg@princeton.edu, E-mail: enrico.pajer@gmail.com [Department of Physics, Princeton University, Princeton, NJ 08544 (United States)
2013-02-01T23:59:59.000Z
Models of axion inflation are particularly interesting since they provide a natural justification for the flatness of the potential over a super-Planckian distance, namely the approximate shift-symmetry of the inflaton. In addition, most of the observational consequences are directly related to this symmetry and hence are correlated. Large tensor modes can be accompanied by the observable effects of a the shift-symmetric coupling ?F F-tilde to a gauge field. During inflation this coupling leads to a copious production of gauge quanta and consequently a very distinct modification of the primordial curvature perturbations. In this work we compare these predictions with observations. We find that the leading constraint on the model comes from the CMB power spectrum when considering both WMAP 7-year and ACT data. The bispectrum generated by the non-Gaussian inverse-decay of the gauge field leads to a comparable but slightly weaker constraint. There is also a constraint from ?-distortion using TRIS plus COBE/FIRAS data, but it is much weaker. Finally we comment on a generalization of the model to massive gauge fields. When the mass is generated by some light Higgs field, observably large local non-Gaussianity can be produced.
Constraints on cosmological parameters through clusters XLF and XTF
A. Del Popolo; N. Ercan
2005-08-30T23:59:59.000Z
In this paper, I revisit the constraints obtained by several authors (Reichart et al. 1999; Eke et al. 1998; Henry 2000) on the estimated values of $\\Omega_{\\rm m}$, $n$ and $\\sigma_8$ in the light of recent theoretical developments: 1) new theoretical mass functions (Sheth & Tormen 1999, Sheth, Mo & Tormen 2001, Del Popolo 2002b); 2) a more accurate mass-temperature relation, also determined for arbitrary $\\Omega_{\\rm m}$ and $\\Omega_{\\rm \\Lambda}$ (Del Popolo 2002a). Firstly, using the quoted improvements, I re-derive an expression for the X-ray Luminosity Function (XLF), similarly to Reichart et al. (1999), and then I get some constraints to $\\Omega_{\\rm m}$ and $n$, by using the {\\it ROSAT} BCS and {\\rm EMSS} samples and maximum-likelihood analysis. Then I re-derive the X-ray Temperature Function (XTF), similarly to Henry (2000), re-obtaining the constraints on $\\Omega_{\\rm m}$, $n$, $\\sigma_8$. Both in the case of the XLF and XTF, the changes in the mass function and M-T relation produces an increase in $\\Omega_{\\rm m}$ of $ \\simeq 20%$ and similar results in $\\sigma_8$ and $n$.
Non-Linear Massive Gravity with Additional Primary Constraint and Absence of Ghosts
J. Kluson
2012-04-13T23:59:59.000Z
We complete the Hamiltonian analysis of specific model of non-linear massive gravity that was started in arXiv:1112.5267. We identify the primary constraint and corresponding secondary constraint. We show that they are the second class constraints and hence they lead to the elimination of the additional scalar mode. We also find that the remaining constraints are the first class constraints with the structure that corresponds to the manifestly diffeomorphism invariant theory. Finally we determine the number of physical degrees of freedom and we show that it corresponds to the number of physical modes of massive gravity.
Pablant, N. A.; Bell, R. E.; Bitter, M.; Delgado-Aparicio, L.; Hill, K. W.; Lazerson, S. [Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543 (United States); Morita, S. [National Institute for Fusion Science, Toki 509-5292, Gifu (Japan)
2014-11-15T23:59:59.000Z
Accurate tomographic inversion is important for diagnostic systems on stellarators and tokamaks which rely on measurements of line integrated emission spectra. A tomographic inversion technique based on spline optimization with enforcement of constraints is described that can produce unique and physically relevant inversions even in situations with noisy or incomplete input data. This inversion technique is routinely used in the analysis of data from the x-ray imaging crystal spectrometer (XICS) installed at the Large Helical Device. The XICS diagnostic records a 1D image of line integrated emission spectra from impurities in the plasma. Through the use of Doppler spectroscopy and tomographic inversion, XICS can provide profile measurements of the local emissivity, temperature, and plasma flow. Tomographic inversion requires the assumption that these measured quantities are flux surface functions, and that a known plasma equilibrium reconstruction is available. In the case of low signal levels or partial spatial coverage of the plasma cross-section, standard inversion techniques utilizing matrix inversion and linear-regularization often cannot produce unique and physically relevant solutions. The addition of physical constraints, such as parameter ranges, derivative directions, and boundary conditions, allow for unique solutions to be reliably found. The constrained inversion technique described here utilizes a modified Levenberg-Marquardt optimization scheme, which introduces a condition avoidance mechanism by selective reduction of search directions. The constrained inversion technique also allows for the addition of more complicated parameter dependencies, for example, geometrical dependence of the emissivity due to asymmetries in the plasma density arising from fast rotation. The accuracy of this constrained inversion technique is discussed, with an emphasis on its applicability to systems with limited plasma coverage.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Pablant, N. A. [PPPL; Bell, R. E. [PPPL; Bitter, M. [PPPL; Delgado-Aparicio, L. [PPPL; Hill, K. W. [PPPL; Lazerson, S. [PPPL; Morita, S. [National Institute for Fusion Science, Toki 509-5292, Gifu, Japan
2014-11-01T23:59:59.000Z
Accurate tomographic inversion is important for diagnostic systems on stellarators and tokamaks which rely on measurements of line integrated emission spectra. A tomographic inversion technique based on spline optimization with enforcement of constraints is described that can produce unique and physically relevant inversions even in situations with noisy or incomplete input data. This inversion technique is routinely used in the analysis of data from the x-ray imaging crystal spectrometer (XICS) installed at LHD. The XICS diagnostic records a 1D image of line integrated emission spectra from impurities in the plasma. Through the use of Doppler spectroscopy and tomographic inversion, XICS can provide pro#12;file measurements of the local emissivity, temperature and plasma flow. Tomographic inversion requires the assumption that these measured quantities are flux surface functions, and that a known plasma equilibrium reconstruction is available. In the case of low signal levels or partial spatial coverage of the plasma cross-section, standard inversion techniques utilizing matrix inversion and linear-regularization often cannot produce unique and physically relevant solutions. The addition of physical constraints, such as parameter ranges, derivative directions, and boundary conditions, allow for unique solutions to be reliably found. The constrained inversion technique described here utilizes a modifi#12;ed Levenberg-Marquardt optimization scheme, which introduces a condition avoidance mechanism by selective reduction of search directions. The constrained inversion technique also allows for the addition of more complicated parameter dependencies, for example geometrical dependence of the emissivity due to asymmetries in the plasma density arising from fast rotation. The accuracy of this constrained inversion technique is discussed, with an emphasis on its applicability to systems with limited plasma coverage.
Constraints on shallow {sup 56}Ni from the early light curves of type Ia supernovae
Piro, Anthony L. [Theoretical Astrophysics, California Institute of Technology, 1200 E California Boulevard, M/C 350-17, Pasadena, CA 91125 (United States); Nakar, Ehud, E-mail: piro@caltech.edu [Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Tel Aviv 69978 (Israel)
2014-03-20T23:59:59.000Z
Ongoing transient surveys are presenting an unprecedented account of the rising light curves of Type Ia supernovae (SNe Ia). This early emission probes the shallowest layers of the exploding white dwarf (WD), which can provide constraints on the progenitor star and the properties of the explosive burning. We use semianalytic models of radioactively powered rising light curves to analyze these observations. As we have summarized in previous work, the main limiting factor in determining the surface distribution of {sup 56}Ni is the lack of an unambiguously identified time of explosion, as would be provided by detection of shock breakout or shock-heated cooling. Without this the SN may in principle exhibit a 'dark phase' for a few hours to days, where the only emission is from shock-heated cooling that is too dim to be detected. We show that by assuming a theoretically motivated time-dependent velocity evolution, the explosion time can be better constrained, albeit with potential systematic uncertainties. This technique is used to infer the surface {sup 56}Ni distributions of three recent SNe Ia that were caught especially early in their rise. In all three we find fairly similar {sup 56}Ni distributions. Observations of SN 2011fe and SN 2012cg probe shallower depths than SN 2009ig, and in these two cases {sup 56}Ni is present merely ?10{sup –2} M {sub ?} from the WDs' surfaces. The uncertainty in this result is up to an order of magnitude given the difficulty of precisely constraining the explosion time. We also use our conclusions about the explosion times to reassess radius constraints for the progenitor of SN 2011fe, as well as discuss the roughly t {sup 2} power law that is inferred for many observed rising light curves.
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Pablant, N. A.; Bell, R. E.; Bitter, M.; Delgado-Aparicio, L.; Hill, K. W.; Lazerson, S.; Morita, S.
2014-11-01T23:59:59.000Z
Accurate tomographic inversion is important for diagnostic systems on stellarators and tokamaks which rely on measurements of line integrated emission spectra. A tomographic inversion technique based on spline optimization with enforcement of constraints is described that can produce unique and physically relevant inversions even in situations with noisy or incomplete input data. This inversion technique is routinely used in the analysis of data from the x-ray imaging crystal spectrometer (XICS) installed at LHD. The XICS diagnostic records a 1D image of line integrated emission spectra from impurities in the plasma. Through the use of Doppler spectroscopy and tomographic inversion, XICSmore »can provide pro#12;file measurements of the local emissivity, temperature and plasma flow. Tomographic inversion requires the assumption that these measured quantities are flux surface functions, and that a known plasma equilibrium reconstruction is available. In the case of low signal levels or partial spatial coverage of the plasma cross-section, standard inversion techniques utilizing matrix inversion and linear-regularization often cannot produce unique and physically relevant solutions. The addition of physical constraints, such as parameter ranges, derivative directions, and boundary conditions, allow for unique solutions to be reliably found. The constrained inversion technique described here utilizes a modifi#12;ed Levenberg-Marquardt optimization scheme, which introduces a condition avoidance mechanism by selective reduction of search directions. The constrained inversion technique also allows for the addition of more complicated parameter dependencies, for example geometrical dependence of the emissivity due to asymmetries in the plasma density arising from fast rotation. The accuracy of this constrained inversion technique is discussed, with an emphasis on its applicability to systems with limited plasma coverage.« less
General relativity limit of Ho?ava-Lifshitz gravity with a scalar field in gradient expansion
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Gümrükçüo?lu, A. Emir; Mukohyama, Shinji; Wang, Anzhong
2012-03-01T23:59:59.000Z
We present a fully nonlinear study of long-wavelength cosmological perturbations within the framework of the projectable Horava-Lifshitz gravity, coupled to a single scalar field. Adopting the gradient expansion technique, we explicitly integrate the dynamical equations up to any order of the expansion, then restrict the integration constants by imposing the momentum constraint. While the gradient expansion relies on the long-wavelength approximation, amplitudes of perturbations do not have to be small. When the ??1 limit is taken, the obtained nonlinear solutions exhibit a continuous behavior at any order of the gradient expansion, recovering general relativity in the presence of a scalar field and the “dark matter as an integration constant.” This is in sharp contrast to the results in the literature based on the “standard” (and naive) perturbative approach where in the same limit, the perturbative expansion of the action breaks down and the scalar graviton mode appears to be strongly coupled. We carry out a detailed analysis on the source of these apparent pathologies and determine that they originate from an improper application of the perturbative approximation in the momentum constraint. We also show that there is a new branch of solutions, valid in the regime where |?-1| is smaller than the order of perturbations. In the limit ??1, this new branch allows the theory to be continuously connected to general relativity, with an effective component which acts like pressureless fluid.
Kinetic limits of dynamical systems
Jens Marklof
2014-08-06T23:59:59.000Z
Since the pioneering work of Maxwell and Boltzmann in the 1860s and 1870s, a major challenge in mathematical physics has been the derivation of macroscopic evolution equations from the fundamental microscopic laws of classical or quantum mechanics. Macroscopic transport equations lie at the heart of many important physical theories, including fluid dynamics, condensed matter theory and nuclear physics. The rigorous derivation of macroscopic transport equations is thus not only a conceptual exercise that establishes their consistency with the fundamental laws of physics: the possibility of finding deviations and corrections to classical evolution equations makes this subject both intellectually exciting and relevant in practical applications. The plan of these lectures is to develop a renormalisation technique that will allow us to derive transport equations for the kinetic limits of two classes of simple dynamical systems, the Lorentz gas and kicked Hamiltonians (or linked twist maps). The technique uses the ergodic theory of flows on homogeneous spaces (homogeneous flows for short), and is based on joint work with Andreas Str\\"ombergsson.
Shear wall ultimate drift limits
Duffey, T.A. [Duffy, (T.A.) Tijeras, NM (United States); Goldman, A. [Goldman, (A.), Sandia, Los Alamos, NM (United States); Farrar, C.R. [Los Alamos National Lab., NM (United States)
1994-04-01T23:59:59.000Z
Drift limits for reinforced-concrete shear walls are investigated by reviewing the open literature for appropriate experimental data. Drift values at ultimate are determined for walls with aspect ratios ranging up to a maximum of 3.53 and undergoing different types of lateral loading (cyclic static, monotonic static, and dynamic). Based on the geometry of actual nuclear power plant structures exclusive of containments and concerns regarding their response during seismic (i.e.,cyclic) loading, data are obtained from pertinent references for which the wall aspect ratio is less than or equal to approximately 1, and for which testing is cyclic in nature (typically displacement controlled). In particular, lateral deflections at ultimate load, and at points in the softening region beyond ultimate for which the load has dropped to 90, 80, 70, 60, and 50 percent of its ultimate value, are obtained and converted to drift information. The statistical nature of the data is also investigated. These data are shown to be lognormally distributed, and an analysis of variance is performed. The use of statistics to estimate Probability of Failure for a shear wall structure is illustrated.
Undergraduate Program Time Limits and Work Schedules
Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)
Time Limits and Work Schedules Undergraduate Program Time Limits and Work Schedules Point your career towards Los Alamos Lab: work with the best minds on the planet in an inclusive...
Neural substrates of cognitive capacity limitations
Buschman, Tim
Cognition has a severely limited capacity: Adult humans can retain only about four items “in mind”. This limitation is fundamental to human brain function: Individual capacity is highly correlated with intelligence measures ...
FUNDAMENTAL PERFORMANCE LIMITS OF WIRELESS SENSOR NETWORKS
Li, Baochun
FUNDAMENTAL PERFORMANCE LIMITS OF WIRELESS SENSOR NETWORKS ZHIHUA HU, BAOCHUN LI Abstract. Understanding the fundamental performance limits of wireless sensor networks is critical towards. Key words. Wireless sensor networks, network capacity, network lifetime. 1. Introduction. When
Permutation Orbifolds in the large N Limit
Belin, Alexandre; Maloney, Alexander
2015-01-01T23:59:59.000Z
The space of permutation orbifolds is a simple landscape of two dimensional CFTs, generalizing the well-known symmetric orbifolds. We consider constraints which a permutation orbifold with large central charge must obey in order to be holographically dual to a weakly coupled (but possibly stringy) theory of gravity in AdS. We then construct explicit examples of permutation orbifolds which obey these constraints. In our constructions the spectrum remains finite at large N, but differs qualitatively from that of symmetric orbifolds. We also discuss under what conditions the correlation functions factorize at large N and thus reduce to those of a generalized free field in AdS. We show that this happens not just for symmetric orbifolds, but also for permutation groups which act "democratically" in a sense which we define.
Limited Liability Companies and Corporate Business Structures
Thompson, Bill; Polk, Wade; Hayenga, Wayne
2009-01-07T23:59:59.000Z
This publication describes limited liability companies and corporate forms of business organization, including S-Corporations and C-Corporations....
Constraints on particle dark matter from cosmic-ray antiprotons
N. Fornengo; L. Maccione; A. Vittino
2015-01-30T23:59:59.000Z
Cosmic-ray antiprotons represent an important channel for dark matter indirect-detection studies. Current measurements of the antiproton flux at the top of the atmosphere and theoretical determinations of the secondary antiproton production in the Galaxy are in good agreement, with no manifest deviation which could point to an exotic contribution in this channel. Therefore, antiprotons can be used as a powerful tool for constraining particle dark matter properties. By using the spectrum of PAMELA data from 50 MV to 180 GV in rigidity, we derive bounds on the dark matter annihilation cross section (or decay rate, for decaying dark matter) for the whole spectrum of dark matter annihilation (decay) channels and under different hypotheses of cosmic-rays transport in the Galaxy and in the heliosphere. For typical models of galactic propagation, the constraints are significantly strong, setting a lower bound on the dark matter mass of a "thermal" relic at about 50-90 GeV for hadronic annihilation channels. These bounds are enhanced to about 150 GeV on the dark matter mass, when large cosmic-rays confinement volumes in the Galaxy are considered, and are reduced to 4-5 GeV for annihilation to light quarks (no bound for heavy-quark production) when the confinement volume is small. Bounds for dark matter lighter than few tens of GeV are due to the low energy part of the PAMELA spectrum, an energy region where solar modulation is relevant: to this aim, we have implemented a detailed solution of the transport equation in the heliosphere, which allowed us not only to extend bounds to light dark matter, but also to determine the uncertainty on the constraints arising from solar modulation modeling. Finally, we estimate the impact of soon-to-come AMS-02 data on the antiproton constraints.
High temperature superconducting fault current limiter
Hull, J.R.
1997-02-04T23:59:59.000Z
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.
High temperature superconducting fault current limiter
Hull, John R. (Hinsdale, IL)
1997-01-01T23:59:59.000Z
A fault current limiter (10) for an electrical circuit (14). The fault current limiter (10) includes a high temperature superconductor (12) in the electrical circuit (14). The high temperature superconductor (12) is cooled below its critical temperature to maintain the superconducting electrical properties during operation as the fault current limiter (10).
Constraints on Majorana dark matter from a fourth lepton family
Hapola, Tuomas [Institute for Particle Physics Phenomenology, Durham University, South Road, Durham DH1 3LE (United Kingdom); Järvinen, Matti [Crete Center for Theoretical Physics, University of Crete, 71003 Heraklion (Greece); Kouvaris, Chris; Panci, Paolo; Virkajärvi, Jussi, E-mail: t.a.hapola@durham.ac.uk, E-mail: mjarvine@physics.uoc.gr, E-mail: kouvaris@cp3.dias.sdu.dk, E-mail: panci@cp3-origins.net, E-mail: virkajarvi@cp3-origins.net [CP "3-Origins and DIAS, University of Southern Denmark, Campusvej 55, DK-5230 Odense M (Denmark)
2014-02-01T23:59:59.000Z
We study the possibility of dark matter in the form of heavy neutrinos from a fourth lepton family with helicity suppressed couplings such that dark matter is produced thermally via annihilations in the early Universe. We present all possible constraints for this scenario coming from LHC and collider physics, underground direct detectors, neutrino telescopes, and indirect astrophysical searches. Although we embed the WIMP candidate within a model of composite dynamics, the majority of our results are model independent and applicable to all models where heavy neutrinos with suppressed couplings account for the dark matter abundance.
Constraints on Automorphic Forms of Higher Derivative Terms from Compactification
Finn Gubay; Neil Lambert; Peter West
2010-08-04T23:59:59.000Z
By dimensionally reducing the higher derivative corrections of ten-dimensional IIB theory on a torus we deduce constraints on the E_{n+1} automorphic forms that occur in d=10-n dimensions. In particular we argue that these automorphic forms involve the representation of E_{n+1} with fundamental weight \\lambda^{n+1}, which is also the representation to which the string charges in d dimensions belong. We also consider a similar calculation for the reduction of higher derivative terms in eleven-dimensional M-theory.
Strong Binary Pulsar Constraints on Lorentz Violation in Gravity
Kent Yagi; Diego Blas; Nicolas Yunes; Enrico Barausse
2014-04-30T23:59:59.000Z
Binary pulsars are excellent laboratories to test the building blocks of Einstein's theory of General Relativity. One of these is Lorentz symmetry which states that physical phenomena appear the same for all inertially moving observers. We study the effect of violations of Lorentz symmetry in the orbital evolution of binary pulsars and find that it induces a much more rapid decay of the binary's orbital period due to the emission of dipolar radiation. The absence of such behavior in recent observations allows us to place the most stringent constraints on Lorentz violation in gravity, thus verifying one of the cornerstones of Einstein's theory much more accurately than any previous gravitational observation.
Reassessing thermodynamic and dynamic constraints on global wind power
Makarieva, A M; Nefiodov, A V; Sheil, D; Nobre, A D; Li, B L
2015-01-01T23:59:59.000Z
We analyze the determinants of the power output of moist atmospheric air. It is shown to be represented as a sum of terms with different physical meanings and uncertainties. We demonstrate that using a thermodynamic approach to constrain the global power output as a whole, e.g. by considering the entropy budget (Lalibert\\'e et al., 2015), results in a loss of information concerning the rate of kinetic energy generation. We discuss why it is important to find dynamic constraints on wind power and emphasize the role of condensation in the generation of atmospheric circulation.
Dynamic storage of continuous products under volume constraints
Lewis, Harry Swift
1968-01-01T23:59:59.000Z
as assigned to the products and sharing, and will. indicate the best feasible solution. This com- piete enumeration is for the purpose of illu tration and will be. shown more directly in another section. There- fore, the problem reduces to one...), then the solution may be given as Q'=S-S m (13) Qmax tm (Pm mj It can be seen that if the tank release constraints in (10'i are sati. sfied, for any tank assignment, that the solution is determined by (11) or (13) depending on the ~ condition established...
Constraints on Light Dark Matter from Big Bang Nucleosynthesis
Brian Henning; Hitoshi Murayama
2012-05-29T23:59:59.000Z
We examine the effects of relic dark matter annihilations on big bang nucleosynthesis (BBN). The magnitude of these effects have scale simply with the dark matter mass and annihilation cross-section, which we derive. Estimates based on these scaling behaviors indicate that BBN severely constrains hadronic and radiative dark matter annihilation channels in the previously unconsidered dark matter mass region MeV $\\lesssim m_{\\chi} \\lesssim 10$ GeV. Interestingly, we find that BBN constraints on hadronic annihilation channels are competitive with similar bounds derived from the cosmic microwave background.
Causality Constraint on Noncritical Einstein-Weyl Gravity
Fu-Wen Shu; Yungui Gong
2014-10-31T23:59:59.000Z
We explore, in the context of AdS/CFT correspondence, the causality constraints on the Noncritical Einstein-Weyl (NEW) gravity model in five dimensions. The scalar and shear channels are considered as small metric perturbations around an AdS black brane background. Our results show that causality analysis on the propagation of these two channels imposes a new bound on the coupling of the Weyl-squared terms in the NEW gravity. This new bound imposes more stringent restrictions than those of the tachyon-free condition, improving predictive power of the theory.
Generalized Pauli constraints: Hierarchy of pinning and quasipinning-measure
Felix Tennie; Vlatko Vedral; Christian Schilling
2015-09-01T23:59:59.000Z
The Pauli exclusion principle (PEP) has a tremendous impact on the properties and the behavior of most fermionic quantum systems. Remarkably, even stronger restrictions on fermionic natural occupation numbers follow from the fermionic exchange statistics. Based on a hierarchy induced by PEP we develop an operationally meaningful measure which allows to quantify the potential physical relevance of those generalized Pauli constraints (GPC) beyond the well-established relevance of PEP. By studying a few fermions in a harmonic trap we explore and confirm for the first time such nontrivial significance of GPC not only for weak couplings but even up to medium interaction strengths.
Ashtekar Constraint Surface as Projection of Hilbert-Palatini One
V. M. Khatsymovsky
1996-04-29T23:59:59.000Z
The Hilbert-Palatini (HP) Lagrangian of general relativity being written in terms of selfdual and antiselfdual variables contains Ashtekar Lagrangian (which governs the dynamics of the selfdual sector of the theory on condition that the dynamics of antiselfdual sector is not fixed). We show that nonequivalence of the Ashtekar and HP quantum theories is due to the specific form (of the "loose relation" type) of constraints which relate self- and antiselfdual variables so that the procedure of (canonical) quantisation of such the theory is noncommutative with the procedure of excluding antiselfdual variables.
Mattia Villani
2015-02-24T23:59:59.000Z
ADM tetrad gravity is an Hamiltonian reformulation of General Relativity which gives new insight to the Dark Matter Problem. We impose constraints on the parameter space of ADM tetrad gravity with a Yukawa-like ansatz for the trace of the extrinsic curvature of the 3D hypersurfaces by fitting the orbit of the S2 star around the Black Hole in the Galactic center and using the perihelia of some of the planets of the Solar System. We find very thight constraints on the \\emph{strength} of the coupling, $4.2 \\,\\times \\, 10^{-4} \\, \\text{AU}\\,\\lesssim \\, \\delta \\, \\lesssim \\, 4.6 \\, \\times \\, 10^{-4} \\, \\text{AU}$, and an upper limit for the (inverse) scale length, $\\mu \\, \\lesssim \\, 3.5 \\, \\times \\, 10^{-6} \\, \\text{AU}^{-1}$.
S. Adamenko; V. Bolotov; V. Novikov
2013-07-17T23:59:59.000Z
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.
Super-Kamiokande Constraints on R-parity Violating Supersymmetry
Vadim Bednyakov; Amand Faessler; Sergey Kovalenko
1998-08-06T23:59:59.000Z
We consider the neutrino oscillations within the minimal supersymmetric standard model with R-parity violation. The Super-Kamiokande atmospheric neutrino data are used to set limits on the bilinear R-parity violating terms. These very stringent limits are out of reach of the other experiments at present and in the near future.
CMB Constraints On The Thermal WIMP Annihilation Cross Section
Steigman, Gary
2015-01-01T23:59:59.000Z
A thermal relic, often referred to as a weakly interacting massive particle (WIMP),is a particle produced during the early evolution of the Universe whose relic abundance (e.g., at present) depends only on its mass and its thermally averaged annihilation cross section (annihilation rate factor) sigma*v_ann. Late time WIMP annihilation has the potential to affect the cosmic microwave background (CMB) power spectrum. Current observational constraints on the absence of such effects provide bounds on the mass and the annihilation cross section of relic particles that may, but need not be dark matter candidates. For a WIMP that is a dark matter candidate, the CMB constraint sets an upper bound to the annihilation cross section, leading to a lower bound to their mass that depends on whether or not the WIMP is its own antiparticle. For a self-conjugate WIMP, m_min = 50f GeV, where f is an electromagnetic energy efficiency factor. For a non self-conjugate WIMP, the minimum mass is a factor of two larger. For a WIMP t...
Unbiased constraints on the clumpiness of universe from standard candles
Li, Zhengxiang; Zhu, Zong-Hong
2015-01-01T23:59:59.000Z
We perform unbiased tests for the clumpiness of universe by confronting the Zel'dovich-Kantowski-Dyer-Roeder luminosity distance which describes the effect of local inhomogeneities on the propagation of light with the observational one estimated from measurements of standard candles, i.e., type Ia supernovae (SNe Ia) and gamma-ray bursts (GRBs). Methodologically, we first determine the light-curve fitting parameters which account for distance estimation in SNe Ia observations and luminosity/energy relations which are responsible for distance estimation of GRBs in the global fit to reconstruct the Hubble diagrams in the context of a clumpy universe. Subsequently, these Hubble diagrams allow us to achieve unbiased constraints on the matter density parameter $\\Omega_m$ as well as clumpiness parameter $\\eta$ which quantifies the fraction of homogeneously distributed matter within a given light cone. At 1$\\sigma$ confidence level, the constraints are $\\Omega_m=0.34\\pm0.02$ and $\\eta=1.00^{+0.00}_{-0.02}$ from the ...
A taste of dark matter: Flavour constraints on pseudoscalar mediators
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Dolan, Matthew J.; Kahlhoefer, Felix; McCabe, Christopher; Schmidt-Hoberg, Kai
2015-03-31T23:59:59.000Z
Dark matter interacting via the exchange of a light pseudoscalar can induce observable signals in indirect detection experiments and experience large self-interactions while evading the strong bounds from direct dark matter searches. The pseudoscalar mediator will however induce flavour-changing interactions in the Standard Model, providing a promising alternative way to test these models. We investigate in detail the constraints arising from rare meson decays and fixed target experiments for different coupling structures between the pseudoscalar and Standard Model fermions. The resulting bounds are highly complementary to the information inferred from the dark matter relic density and the constraints from primordialmore »nucleosynthesis. We discuss the implications of our findings for the dark matter self-interaction cross section and the prospects of probing dark matter coupled to a light pseudoscalar with direct or indirect detection experiments. In particular, we find that a pseudoscalar mediator can only explain the Galactic Centre excess if its mass is above that of the B mesons, and that it is impossible to obtain a sufficiently large direct detection cross section to account for the DAMA modulation.« less
New constraints for heavy axion-like particles from supernovae
Giannotti, M.; Nita, R. [Physical Sciences, Barry University, Miami Shores, FL 33161 (United States); Duffy, L.D., E-mail: mgiannotti@mail.barry.edu, E-mail: ldd@lanl.gov, E-mail: Rafaela.Nita@mymail.barry.edu [Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)
2011-01-01T23:59:59.000Z
We derive new constraints on the coupling of heavy pseudoscalar (axion-like) particles to photons, based on the gamma ray flux expected from the decay of these particles into photons. After being produced in the supernova core, these heavy axion-like particles would escape and a fraction of them would decay into photons before reaching the Earth. We have calculated the expected flux on Earth of these photons from the supernovae SN 1987A and Cassiopeia A and compared our results to data from the Fermi Large Area Telescope. This analysis provides strong constraints on the parameter space for axion-like particles. For a particle mass of 100 MeV, we find that the Peccei-Quinn constant, f{sub a}, must be greater than about 10{sup 15} GeV. Alternatively, for f{sub a} = 10{sup 12} GeV, we exclude the mass region between approximately 100 eV and 1 GeV.
Nonclassical readout of optical memories under local energy constraint
Gaetana Spedalieri; Cosmo Lupo; Stefano Pirandola
2015-09-03T23:59:59.000Z
Nonclassical states of light play a central role in many quantum information protocols. Their quantum features have been exploited to improve the readout of information from digital memories, modelled as arrays of microscopic beam splitters [S. Pirandola, Phys. Rev. Lett. 106, 090504 (2011)]. In this model of "quantum reading", a nonclassical source of light with Einstein-Podolski-Rosen correlations has been proven to retrieve more information than any classical source. In particular, the quantum-classical comparison has been performed under a global energy constraint, i.e., by fixing the mean total number of photons irradiated over each memory cell. In this paper we provide an alternative analysis which is based on a local energy constraint, meaning that we fix the mean number of photons per signal mode irradiated over the memory cell. Under this assumption, we investigate the critical number of signal modes after which a nonclassical source of light is able to beat any classical source irradiating the same number of signals.
Cosmological Constraints from Hubble Parameter on f(R) Cosmologies
F. C. Carvalho; E. M. Santos; J. S. Alcaniz; J. Santos
2008-11-10T23:59:59.000Z
Modified $f(R)$ gravity in the Palatini approach has been presently applied to Cosmology as a realistic alternative to dark energy. In this concern, a number of authors have searched for observational constraints on several $f(R)$ gravity functional forms using mainly data of type Ia supenovae (SNe Ia), Cosmic Microwave Background ({\\rm CMB}) radiation and Large Scale Structure ({\\rm LSS}). In this paper, by considering a homogeneous and isotropic flat universe, we use determinations of the Hubble function $H(z)$, which are based on differential age method, to place bounds on the free parameters of the $f(R) = R - \\beta/R^{n}$ functional form. We also combine the $H(z)$ data with constraints from Baryon Acoustic Oscillations ({\\rm BAO}) and {\\rm CMB} measurements, obtaining ranges of values for $n$ and $\\beta$ in agreement with other independent analyses. We find that, for some intervals of $n$ and $\\beta$, models based on $f(R) = R - \\beta/R^{n}$ gravity in the Palatini approach, unlike the metric formalism, can produce the sequence of radiation-dominated, matter-dominated, and accelerating periods without need of dark energy.
A d-person Differential Game with State Space Constraints
Ramasubramanian, S. [Indian Statistical Institute, Stat. Math. Unit (India)], E-mail: ram@isibang.ac.in
2007-12-15T23:59:59.000Z
We consider a network of d companies (insurance companies, for example) operating under a treaty to diversify risk. Internal and external borrowing are allowed to avert ruin of any member of the network. The amount borrowed to prevent ruin is viewed upon as control. Repayment of these loans entails a control cost in addition to the usual costs. Each company tries to minimize its repayment liability. This leads to a d -person differential game with state space constraints. If the companies are also in possible competition a Nash equilibrium is sought. Otherwise a utopian equilibrium is more appropriate. The corresponding systems of HJB equations and boundary conditions are derived. In the case of Nash equilibrium, the Hamiltonian can be discontinuous; there are d interlinked control problems with state constraints; each value function is a constrained viscosity solution to the appropriate discontinuous HJB equation. Uniqueness does not hold in general in this case. In the case of utopian equilibrium, each value function turns out to be the unique constrained viscosity solution to the appropriate HJB equation. Connection with Skorokhod problem is briefly discussed.
An Improved Limit on Pauli-Exclusion-Principle Forbidden Atomic Transitions
S. R. Elliott; B. H. LaRoque; V. M. Gehman; M. F. Kidd; M. Chen
2012-01-09T23:59:59.000Z
We have examined the atomic theory behind recent constraints on the violation of the Pauli Exclusion Principle derived from experiments that look for x rays emitted from conductors while a large current is present. We also re-examine the assumptions underlying such experiments. We use the results of these studies to assess pilot measurements to develop an improved test of the Principle. We present an improved limit of $(1/2)\\beta^2 < 2.6\\times10^{-39}$ on the Pauli Exclusion Principle. This limit is the best to date for interactions between a system of fermions and a fermion that has not previously interacted with that given system. That is, for systems that do not obviously violate the Messiah-Greenberg symmetrization-postulate selection rule.
IceCube events and decaying dark matter: hints and constraints
Arman Esmaili; Sin Kyu Kang; Pasquale Dario Serpico
2015-01-08T23:59:59.000Z
In the light of the new IceCube data on the (yet unidentified) astrophysical neutrino flux in the PeV and sub-PeV range, we present an update on the status of decaying dark matter interpretation of the events. In particular, we develop further the angular distribution analysis and discuss the perspectives for diagnostics. By performing various statistical tests (maximum likelihood, Kolmogorov-Smirnov and Anderson-Darling tests) we conclude that currently the data show a mild preference (below the two sigma level) for the angular distribution expected from dark matter decay vs. the isotropic distribution foreseen for a conventional astrophysical flux of extragalactic origin. Also, we briefly develop some general considerations on heavy dark matter model building and on the compatibility of the expected energy spectrum of decay products with the IceCube data, as well as with existing bounds from gamma-rays. Alternatively, assuming that the IceCube data originate from conventional astrophysical sources, we derive bounds on both decaying and annihilating dark matter for various final states. The lower limits on heavy dark matter lifetime improve by up to an order of magnitude with respect to existing constraints, definitively making these events---even if astrophysical in origin---an important tool for astroparticle physics studies.
Constraints on the symmetry energy from observational probes of the neutron star crust
Newton, William G; Gearheart, Michael; Murphy, Kyleah; Wen, De-Hua; Fattoyev, Farrukh; Li, Bao-An
2015-01-01T23:59:59.000Z
A number of observed phenomena associated with individual neutron star systems or neutron star populations find explanations in models in which the neutron star crust plays an important role. We review recent work examining the sensitivity to the slope of the symmetry energy $L$ of such models, and constraints extracted on $L$ from confronting them with observations. We focus on six sets of observations and proposed explanations: (i) The cooling rate of the neutron star in Cassiopeia A, confronting cooling models which include enhanced cooling in the nuclear pasta regions of the inner crust, (ii) the upper limit of the observed periods of young X-ray pulsars, confronting models of magnetic field decay in the crust caused by the high resistivity of the nuclear pasta layer, (iii) glitches from the Vela pulsar, confronting the paradigm that they arise due to a sudden re-coupling of the crustal neutron superfluid to the crustal lattice after a period during which they were decoupled due to vortex pinning, (iv) Th...
INTERPRETING THE GLOBAL 21 cm SIGNAL FROM HIGH REDSHIFTS. I. MODEL-INDEPENDENT CONSTRAINTS
Mirocha, Jordan; Harker, Geraint J. A.; Burns, Jack O., E-mail: jordan.mirocha@colorado.edu [Center for Astrophysics and Space Astronomy, University of Colorado, Campus Box 389, Boulder, CO 80309 (United States)
2013-11-10T23:59:59.000Z
The sky-averaged (global) 21 cm signal is a powerful probe of the intergalactic medium (IGM) prior to the completion of reionization. However, so far it has been unclear whether it will provide more than crude estimates of when the universe's first stars and black holes formed, even in the best case scenario in which the signal is accurately extracted from the foregrounds. In contrast to previous work, which has focused on predicting the 21 cm signatures of the first luminous objects, we investigate an arbitrary realization of the signal and attempt to translate its features to the physical properties of the IGM. Within a simplified global framework, the 21 cm signal yields quantitative constraints on the Ly? background intensity, net heat deposition, ionized fraction, and their time derivatives without invoking models for the astrophysical sources themselves. The 21 cm absorption signal is most easily interpreted, setting strong limits on the heating rate density of the universe with a measurement of its redshift alone, independent of the ionization history or details of the Ly? background evolution. In a companion paper, we extend these results, focusing on the confidence with which one can infer source emissivities from IGM properties.
Constraint-Based Linear-Relations Analysis Sriram Sankaranarayanan, Henny B. Sipma, and Zohar Manna
Sankaranarayanan, Sriram
Constraint-Based Linear-Relations Analysis Sriram Sankaranarayanan, Henny B. Sipma, and Zohar Manna Computer Science Department Stanford University Stanford, CA 94305-9045 {srirams
Environmental Constraints on Hydropower: An Ex Post Benefit-Cost Analysis of Dam
Lupi, Frank
Environmental Constraints on Hydropower: An Ex Post Benefit-Cost Analysis of Dam Relicensing Consumers Protection Act (1986), which instructs federal regulators to ``balance'' hydropower
Resource allocation for semi-elastic applications with outage constraints in cellular networks
Yang, C; Jordan, S
2015-01-01T23:59:59.000Z
Liang, and S. -G. H¨aggman, “Outage probability in GSM- GPRSand rate control with outage constraints in CDMA wirelessand P. Spasojevic, “Service outage based power and rate
Goldstein, S.J.; Abdel-Fattah, A.I.; Murrell, M.T.; Dobson, P.F.; Norman, D.E.; Amato, R.S.; Nunn, A. J.
2009-10-01T23:59:59.000Z
Uranium-series data for groundwater samples from the Nopal I uranium ore deposit were obtained to place constraints on radionuclide transport and hydrologic processes for a nuclear waste repository located in fractured, unsaturated volcanic tuff. Decreasing uranium concentrations for wells drilled in 2003 are consistent with a simple physical mixing model that indicates that groundwater velocities are low ({approx}10 m/y). Uranium isotopic constraints, well productivities, and radon systematics also suggest limited groundwater mixing and slow flow in the saturated zone. Uranium isotopic systematics for seepage water collected in the mine adit show a spatial dependence which is consistent with longer water-rock interaction times and higher uranium dissolution inputs at the front adit where the deposit is located. Uranium-series disequilibria measurements for mostly unsaturated zone samples indicate that {sup 230}Th/{sup 238}U activity ratios range from 0.005-0.48 and {sup 226}Ra/{sup 238}U activity ratios range from 0.006-113. {sup 239}Pu/{sup 238}U mass ratios for the saturated zone are <2 x 10{sup -14}, and Pu mobility in the saturated zone is >1000 times lower than the U mobility. Saturated zone mobility decreases in the order {sup 238}U{approx}{sup 226}Ra > {sup 230}Th{approx}{sup 239}Pu. Radium and thorium appear to have higher mobility in the unsaturated zone based on U-series data from fractures and seepage water near the deposit.
Constraints on the symmetry energy from observational probes of the neutron star crust
William G. Newton; Joshua Hooker; Michael Gearheart; Kyleah Murphy; De-Hua Wen; Farrukh Fattoyev; Bao-An Li
2015-06-07T23:59:59.000Z
A number of observed phenomena associated with individual neutron star systems or neutron star populations find explanations in models in which the neutron star crust plays an important role. We review recent work examining the sensitivity to the slope of the symmetry energy $L$ of such models, and constraints extracted on $L$ from confronting them with observations. We focus on six sets of observations and proposed explanations: (i) The cooling rate of the neutron star in Cassiopeia A, confronting cooling models which include enhanced cooling in the nuclear pasta regions of the inner crust, (ii) the upper limit of the observed periods of young X-ray pulsars, confronting models of magnetic field decay in the crust caused by the high resistivity of the nuclear pasta layer, (iii) glitches from the Vela pulsar, confronting the paradigm that they arise due to a sudden re-coupling of the crustal neutron superfluid to the crustal lattice after a period during which they were decoupled due to vortex pinning, (iv) The frequencies of quasi-periodic oscillations in the X-ray tail of light curves from giant flares from soft gamma-ray repeaters, confronting models of torsional crust oscillations, (v) the upper limit on the frequency to which millisecond pulsars can be spun-up due to accretion from a binary companion, confronting models of the r-mode instability arising above a threshold frequency determined in part by the viscous dissipation timescale at the crust-core boundary, and (vi) the observations of precursor electromagnetic flares a few seconds before short gamma-ray bursts, confronting a model of crust shattering caused by resonant excitation of a crustal oscillation mode by the tidal gravitational field of a companion neutron star just before merger.
Radio and gamma-ray constraints on dark matter annihilation in the Galactic center
Roland M. Crocker; Nicole F. Bell; Csaba Balázs; David I. Jones
2010-03-15T23:59:59.000Z
We determine upper limits on the dark matter (DM) self-annihilation cross section for scenarios in which annihilation leads to the production of electron--positron pairs. In the Galactic centre (GC), relativistic electrons and positrons produce a radio flux via synchroton emission, and a gamma ray flux via bremsstrahlung and inverse Compton scattering. On the basis of archival, interferometric and single-dish radio data, we have determined the radio spectrum of an elliptical region around the Galactic centre of extent 3 degrees semi-major axis (along the Galactic plane) and 1 degree semi-minor axis and a second, rectangular region, also centered on the GC, of extent 1.6 degrees x 0.6 degrees. The radio spectra of both regions are non-thermal over the range of frequencies for which we have data: 74 MHz -- 10 GHz. We also consider gamma-ray data covering the same region from the EGRET instrument (about GeV) and from HESS (around TeV). We show how the combination of these data can be used to place robust constraints on DM annihilation scenarios, in a way which is relatively insensitive to assumptions about the magnetic field amplitude in this region. Our results are approximately an order of magnitude more constraining than existing Galactic centre radio and gamma ray limits. For a DM mass of m_\\chi =10 GeV, and an NFW profile, we find that the velocity-averaged cross-section must be less than a few times 10^-25 cm^3 s^-1.
Cheng, Jay; Yang, Sheng-Hua; Chao, Tsz-Hsuan; Lee, Duan-Shin; Lien, Ching-Min
2010-01-01T23:59:59.000Z
In this two-part paper, we consider SDL constructions of optical queues with a limited number of recirculations through the optical switches and the fiber delay lines. We show that the constructions of certain types of optical queues, including linear compressors, linear decompressors, and 2-to-1 FIFO multiplexers, under a simple packet routing scheme and under the constraint of a limited number of recirculations can be transformed into equivalent integer representation problems under a corresponding constraint. Given $M$ and $k$, the problem of finding an \\emph{optimal} construction, in the sense of maximizing the maximum delay (resp., buffer size), among our constructions of linear compressors/decompressors (resp., 2-to-1 FIFO multiplexers) is equivalent to the problem of finding an optimal sequence ${\\dbf^*}_1^M$ in $\\Acal_M$ (resp., $\\Bcal_M$) such that $B({\\dbf^*}_1^M;k)=\\max_{\\dbf_1^M\\in \\Acal_M}B(\\dbf_1^M;k)$ (resp., $B({\\dbf^*}_1^M;k)=\\max_{\\dbf_1^M\\in \\Bcal_M}B(\\dbf_1^M;k)$), where $\\Acal_M$ (resp., ...
Time_Limit_Extension_Form.docx | Revised: 10/13/2014 Time Limit Extension Request Form
Meyers, Steven D.
Time_Limit_Extension_Form.docx | Revised: 10/13/2014 Time Limit Extension Request Form OFFICE on your request. PURPOSE The Time Limit Extension may be filed when a student nears the end of the time limitation for completion of the requirements for their degree but needs more time to complete the degree
Impact limiter retention using a tape joint
Gonzales, A.; Eakes, R.G.
1986-01-01T23:59:59.000Z
The Beneficial Uses Shipping System (BUSS) Cask employs polyurethane foam impact limiters that fit onto the ends of the cask. A foam impact limiter takes energy out of a system during a hypothetical accident condition by allowing foam crush and large deformations to occur. This, in turn, precludes high stresses or deformations from occurring to the cask. Because of the need to transmit significant amounts of heat to the environment, the BUSS cask impact limiters were designed to shield a minimum amount of the cask surface area. With this design impact limiter retention after the initial impact resulting from the 9 meter regulatory drops becomes a concern. Retention is essential to ensure the cask does not experience higher stresses during any secondary or rebound effects without impact limiters than it does during the 9 meter regulatory drop with impact limiters in place.
Basic category theory -Limits Gouter des doctorants
Doyen, Laurent
Basic category theory - Limits Gouter des doctorants JÃ©rÃ©my Dubut LSV, ENS Cachan Friday, 3rd April, 2015 JÃ©rÃ©my Dubut (LSV, ENS Cachan) Basic category theory - Limits Friday, 3rd April, 2015 1 / 8 #12 not necessarily exist JÃ©rÃ©my Dubut (LSV, ENS Cachan) Basic category theory - Limits Friday, 3rd April, 2015 2 / 8
Constraints on the Higgs boson width from off-shell production and decay to Z-boson pairs
DOE Public Access Gateway for Energy & Science Beta (PAGES Beta)
Khachatryan, Vardan; et al.,
2014-09-01T23:59:59.000Z
Constraints are presented on the total width of the recently discovered Higgs boson, Gamma[H], using its relative on-shell and off-shell production and decay rates to a pair of Z bosons, where one Z boson decays to an electron or muon pair, and the other to an electron, muon, or neutrino pair. The analysis is based on the data collected by the CMS experiment at the LHC in 2011 and 2012, corresponding to integrated luminosities of 5.1 inverse femtobarns at a centre-of-mass energy sqrt(s) = 7 TeV and 19.7 inverse femtobarns at sqrt(s) = 8 TeV. A simultaneous maximum likelihood fitmore »to the measured kinematic distributions near the resonance peak and above the Z-boson pair production threshold leads to an upper limit on the Higgs boson width of Gamma[H] « less
Future Impacts of Coal Distribution Constraints on Coal Cost
McCollum, David L
2007-01-01T23:59:59.000Z
Council (NCC), 2006, “Coal: America’s Energy Future”, VolumeCan Coal Deliver? America’s Coal Potential & Limits”, Studycoal generating units currently in operation throughout North America (
Solar System Constraints on f(G) Dark Energy
Stephen C. Davis
2008-01-30T23:59:59.000Z
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.
Further constraints on electron acceleration in solar noise storms
Prasad Subramanian; Peter A. Becker
2006-02-28T23:59:59.000Z
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.
Neutron star equations of state with optical potential constraint
Sofija Anti?; Stefan Typel
2015-04-10T23:59:59.000Z
Nuclear matter and neutron stars are studied in the framework of an extended relativistic mean-field (RMF) model with higher-order derivative and density dependent couplings of nucleons to the meson fields. The derivative couplings lead to an energy dependence of the scalar and vector self-energies of the nucleons. It can be adjusted to be consistent with experimental results for the optical potential in nuclear matter. Several parametrisations, which give identical predictions for the saturation properties of nuclear matter, are presented for different forms of the derivative coupling functions. The stellar structure of spherical, non-rotating stars is calculated for these new equations of state (EoS). A substantial softening of the EoS and a reduction of the maximum mass of neutron stars is found if the optical potential constraint is satisfied.
Protecting coherence in Optimal Control Theory: State dependent constraint approach
Jose P. Palao; Ronnie Kosloff; Christiane P. Koch
2008-03-06T23:59:59.000Z
Optimal control theory is developed for the task of obtaining a primary objective in a subspace of the Hilbert space while avoiding other subspaces of the Hilbert space. The primary objective can be a state-to-state transition or a unitary transformation. A new optimization functional is introduced which leads to monotonic convergence of the algorithm. This approach becomes necessary for molecular systems subject to processes implying loss of coherence such as predissociation or ionization. In these subspaces controllability is hampered or even completely lost. Avoiding the lossy channels is achieved via a functional constraint which depends on the state of the system at each instant in time. We outline the resulting new algorithm, discuss its convergence properties and demonstrate its functionality for the example of a state-to-state transition and of a unitary transformation for a model of cold Rb2.
Robust Precoder for Multiuser MISO Downlink with SINR Constraints
Ubaidulla, P
2008-01-01T23:59:59.000Z
In this paper, we consider linear precoding with SINR constraints for the downlink of a multiuser MISO (multiple-input single-output) communication system in the presence of imperfect channel state information (CSI). The base station is equipped with multiple transmit antennas and each user terminal is equipped with a single receive antenna. We propose a robust design of linear precoder which transmits minimum power to provide the required SINR at the user terminals when the true channel state lies in a region of a given size around the channel state available at the transmitter. We show that this design problem can be formulated as a Second Order Cone Program (SOCP) which can be solved efficiently. We compare the performance of the proposed design with some of the robust designs reported in the literature. Simulation results show that the proposed robust design provides better performance with reduced complexity.
Dark radiation from particle decay: cosmological constraints and opportunities
Hasenkamp, Jasper; Kersten, Jörn, E-mail: Jasper.Hasenkamp@desy.de, E-mail: Joern.Kersten@desy.de [II. Institute for Theoretical Physics, University of Hamburg, 22761 Hamburg (Germany)
2013-08-01T23:59:59.000Z
We study particle decay as the origin of dark radiation. After elaborating general properties and useful parametrisations we provide model-independent and easy-to-use constraints from nucleosynthesis, the cosmic microwave background and structure formation. Bounds on branching ratios and mass hierarchies depend in a unique way on the time of decay. We demonstrate their power to exclude well-motivated scenarios taking the example of the lightest ordinary sparticle decaying into the gravitino. We point out signatures and opportunities in cosmological observations and structure formation. For example, if there are two dark decay modes, dark radiation and the observed dark matter with adjustable free-streaming can originate from the same decaying particle, solving small-scale problems of structure formation. Hot dark matter mimicking a neutrino mass scale as deduced from cosmological observations can arise and possibly be distinguished after a discovery. Our results can be used as a guideline for model building.
Stop on Top: SUSY Parameter Regions, Fine-Tuning Constraints
Demir, Durmus Ali
2014-01-01T23:59:59.000Z
We analyze common supersymmetric models in order to determine in what parameter regions with what amount of fine-tuning they are capable of accomodating the LHC-allowed top-stop degeneracy window. The stops must be light enough to enable Higgs naturalness yet heavy enough to induce a 125 GeV Higgs boson mass. These two constraints require the two stops to have a large mass splitting. We find that, compared to the usual neutralino-LSP CMSSM, the NUHM and gravitino-LSP CMSSM models possess relatively wide regions in which the light stop weighs close to the top quark. The fine-tuning involved lies in 10^3-10^4 range.
Constraints on neutrino masses from future cosmological observations
Hirano, Koichi [Department of Elementary Education, Tsuru University, Tsuru 402-8555 (Japan)
2014-05-02T23:59:59.000Z
Constraints on neutrino masses are estimated based on future observations of the cosmic microwave background (CMB) including the B-mode polarization produced by CMB lensing using the Planck satellite, and baryon acoustic oscillations distance scale and the galaxy power spectrum from all-sky galaxy redshift survey in the BigBOSS experiment. We estimate the error in the bound on the total neutrino mass to be ??m{sub v} = 0.012 eV with a 68% confidence level. If the fiducial value of the total neutrino mass is ?m{sub v} = 0.06 eV, this result implies that the neutrino mass hierarchy must be normal.
Isocurvature constraints and anharmonic effects on QCD axion dark matter
Kobayashi, Takeshi [Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St. George Street, Toronto, Ontario M5S 3H8 (Canada); Kurematsu, Ryosuke; Takahashi, Fuminobu, E-mail: takeshi@cita.utoronto.ca, E-mail: rkurematsu@tuhep.phys.tohoku.ac.jp, E-mail: fumi@tuhep.phys.tohoku.ac.jp [Department of Physics, Tohoku University, Sendai 980-8578 (Japan)
2013-09-01T23:59:59.000Z
We revisit the isocurvature density perturbations induced by quantum fluctuations of the axion field by extending a recently developed analytic method and approximations to a time-dependent scalar potential, which enables us to follow the evolution of the axion until it starts to oscillate. We find that, as the initial misalignment angle approaches the hilltop of the potential, the isocurvature perturbations become significantly enhanced, while the non-Gaussianity parameter increases slowly but surely. As a result, the isocurvature constraint on the inflation scale is tightened as H{sub inf}?
Cosmological Constraints from the SDSS Luminous Red Galaxies
M Tegmark; D Eisenstein; M Strauss; D Weinberg; M Blanton; J Frieman; M Fukugita; J Gunn; A Hamilton; G Knapp; R Nichol; J Ostriker; N Padmanabhan; W Percival; D Schlegel; D Schneider; R Scoccimarro; U Seljak; H Seo; M Swanson; A Szalay; M Vogeley; J Yoo; I Zehavi; K Abazajian; S Anderson; J Annis; N Bahcall; B Bassett; A Berlind; J Brinkmann; T Budavari; F Castander; A Connolly; I Csabai; M Doi; D Finkbeiner; B Gillespie; K Glazebrook; G Hennessy; D Hogg; Z Ivezic; B Jain; D Johnston; S Kent; D Lamb; B Lee; H Lin; J Loveday; R Lupton; J Munn; K Pan; C Park; J Peoples; J Pier; A Pope; M Richmond; C Rockosi; R Scranton; R Sheth; A Stebbins; C Stoughton; I Szapudi; D Tucker; D Vanden Berk; B Yanny; D York
2006-10-30T23:59:59.000Z
We measure the large-scale real-space power spectrum P(k) using luminous red galaxies (LRGs) in the Sloan Digital Sky Survey (SDSS) and use this measurement to sharpen constraints on cosmological parameters from the Wilkinson Microwave Anisotropy Probe (WMAP). We employ a matrix-based power spectrum estimation method using Pseudo-Karhunen-Loeve eigenmodes, producing uncorrelated minimum-variance measurements in 20 k-bands of both the clustering power and its anisotropy due to redshift-space distortions, with narrow and well-behaved window functions in the range 0.01h/Mpc 0.1h/Mpc and associated nonlinear complications, yet agree well with more aggressive published analyses where nonlinear modeling is crucial.
Linear media in classical electrodynamics and the Post constraint
Friedrich W. Hehl; Yuri N. Obukhov
2004-11-03T23:59:59.000Z
The Maxwell equations are formulated in a generally covariant and metric-free way in 1+3 and subsequently in 4 dimensions. For this purpose, we use the excitations $\\cal D$, $\\cal H$ and the field strengths $E,B$. A local and linear constitutive law between excitations and field strengths is assumed, with a constitutive tensor $\\chi^{ijkl}=-\\chi^{jikl}=-\\chi^{ijlk}$ of 36 components. The properties of this tensor are discussed. In particular, we address the validity of the Post constraint, a subject that is very much under discussion. In this connection, the Tellegen gyrator, the axion field, and the ``perfect electromagnetic conductor'' of Lindell & Sihvola are compared with each other.
Neural Modeling and Control of Diesel Engine with Pollution Constraints
Ouladsine, Mustapha; Dovifaaz, Xavier; 10.1007/s10846-005-3806-y
2009-01-01T23:59:59.000Z
The paper describes a neural approach for modelling and control of a turbocharged Diesel engine. A neural model, whose structure is mainly based on some physical equations describing the engine behaviour, is built for the rotation speed and the exhaust gas opacity. The model is composed of three interconnected neural submodels, each of them constituting a nonlinear multi-input single-output error model. The structural identi?cation and the parameter estimation from data gathered on a real engine are described. The neural direct model is then used to determine a neural controller of the engine, in a specialized training scheme minimising a multivariable criterion. Simulations show the effect of the pollution constraint weighting on a trajectory tracking of the engine speed. Neural networks, which are ?exible and parsimonious nonlinear black-box models, with universal approximation capabilities, can accurately describe or control complex nonlinear systems, with little a priori theoretical knowledge. The present...
Constraints on neutrinoless double beta decay from neutrino oscillation experiments
S. M. Bilenky; C. Giunti; M. Monteno
1997-01-15T23:59:59.000Z
We show that, in the framework of a general model with mixing of three Majorana neutrinos and a neutrino mass hierarchy, the results of the Bugey and Krasnoyarsk reactor neutrino oscillation experiments imply strong limitations for the effective Majorana mass || that characterizes the amplitude of neutrinoless double beta decay. We obtain further limitations on || from the data of the atmospheric neutrino experiments. We discuss the possible implications of the results of the future long baseline neutrino oscillation experiments for neutrinoless double beta decay.
Dark energy constraints from lensing-detected galaxy clusters
Laura Marian; Gary M. Bernstein
2006-05-31T23:59:59.000Z
We study the ability of weak lensing surveys to detect galaxy clusters and constrain cosmological parameters, in particular the equation of state of dark energy. There are two major sources of noise for weak lensing cluster measurements: the ``shape noise'' from the intrinsic ellipticities of galaxies; and the large scale projection noise. We produce a filter for the shear field which optimizes the signal-to-noise of shape-noise-dominated shear measurements. Our Fisher-matrix analysis of this projected-mass observable makes use of the shape of this mass function, and takes into account the Poisson variance, sample variance, shape noise, and projected-mass noise, and also the fact that the conversion of the shear signal into mass is cosmology-dependent. The Fisher analysis is applied to both a nominal 15,000 square degree ground-based survey and a 1000 square degree space-based survey. Assuming a detection threshold of S/N=5, we find both experiments detect \\~20,000 clusters, and yield 1-sigma constraints of ~0.07 for w0 and ~0.2 for wa when combined with CMB data (for flat universe). The projection noise exceeds the shape noise only for clusters at z<=0.1 and has little effect on the derived dark-energy constraints. Sample variance does not significantly affect either survey. Finally, we note that all these results are extremely sensitive to the noise levels and detection thresholds that we impose. They can be significantly improved if we combine ground and space surveys as independent experiments and add their corresponding Fisher matrices.
Supernova constraints on multi-coupled dark energy
Piloyan, Arpine [Yerevan State University, Alex Manoogian 1, Yerevan 0025 (Armenia); Marra, Valerio; Amendola, Luca [Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg (Germany); Baldi, Marco, E-mail: arpine.piloyan@ysu.am, E-mail: valerio.marra@me.com, E-mail: marco.baldi5@unibo.it, E-mail: l.amendola@thphys.uni-heidelberg.de [Dipartimento di Fisica e Astronomia, Università di Bologna, Viale C. Berti-Pichat 6/2, I-40127, Bologna (Italy)
2013-07-01T23:59:59.000Z
The persisting consistency of ever more accurate observational data with the predictions of the standard ?CDM 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 ?CDM 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 [9] 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. Clearly, linear perturbation data and, even more, nonlinear structure formation properties are expected to put much tighter constraints on the allowed coupling range. Nonetheless, 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.