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We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

RESTRICTED MODULES AND CONJECTURES FOR MODULES OF CONSTANT JORDAN TYPE  

E-Print Network [OSTI]

RESTRICTED MODULES AND CONJECTURES FOR MODULES OF CONSTANT JORDAN TYPE SEMRA ¨OZT¨URK KAPTANO GLU give a method to construct new restricted k[E]-modules of constant Jordan type from k[E]-modules of constant Jordan type and use it to realize several Jordan types. The constraints on the Jordan type

Kaptanoglu, Semra Ozturk

2

RESTRICTED MODULES AND CONJECTURES FOR MODULES OF CONSTANT JORDAN TYPE  

E-Print Network [OSTI]

RESTRICTED MODULES AND CONJECTURES FOR MODULES OF CONSTANT JORDAN TYPE SEMRA ¨OZT¨URK KAPTANO GLU Abstract. We introduce the class of restricted k[A]-modules and pt-Jordan types for a finite abelian p on Jordan types for modules of constant Jordan type when t is 1. We state conjectures giving constraints

Kaptanoglu, Semra Ozturk

3

p-POWER POINTS AND MODULES OF CONSTANT p-POWER JORDAN TYPE  

E-Print Network [OSTI]

p-POWER POINTS AND MODULES OF CONSTANT p-POWER JORDAN TYPE SEMRA ¨OZT¨URK KAPTANO GLU Abstract. We modules of constant pt-Jordan type, constant pt-power-Jordan type as generalizations of modules of constant Jordan type, and pt-support, non-maximal pt-support spaces. We obtain a filtration of modules

Kaptanoglu, Semra Ozturk

4

Wronskian type determinants of orthogonal polynomials, Selberg type formulas and constant term identities  

Science Journals Connector (OSTI)

Let (p"n)"n be a sequence of orthogonal polynomials with respect to the measure @m. Let T be a linear operator acting in the linear space of polynomials P and satisfying deg(T(p))=deg(p)-1, for all polynomial p. We then construct a sequence of polynomials ... Keywords: Casorati determinants, Classical polynomials, Constant term identities, Discrete classical polynomials, Orthogonal polynomials, Selberg formulas

Antonio J. Durn

2014-05-01T23:59:59.000Z

5

The initiation of elongation growth during long-term low-temperature stay of spring-type oilseed rape may trigger loss of frost resistance and changes in photosynthetic apparatus  

Science Journals Connector (OSTI)

The aim of the present investigation was to determine if the loss of frost resistance observed in spring-type oilseed rape during winter may be the effect of the tendency to start elongation growth during the prolonged low-temperature stay. Interactions between elongation growth rate, properties of photosynthetic apparatus and frost resistance were studied under these conditions in spring and winter cultivars of oilseed rape. Both spring and winter cultivars of oilseed rape reached the maximal frost resistance after 6 weeks at +5C. Photosynthetic apparatus of both cultivars acclimated to functioning in cold. The resistance of winter type plants remained unchanged at the end of the experiment (10 weeks) whereas spring-type plants lost the maximal resistance in subsequent weeks. It was preceded in the 7th week of low-temperature stay by acceleration of elongation growth without an increase in dry matter accumulation. A gradual loss of photosynthetic activity was also observed during this period. It was manifested as a decrease in antenna trapping efficiency, photochemical and non-photochemical fluorescence quenching and actual quantum yield of PSII without affecting apparent quantum yield of PSII. At the 70th day of the experiment, a decrease in CO2 exchange and dry matter accumulation were even observed. The possible relationships between growth rate and functioning of photosynthetic apparatus are discussed.

Marcin Rapacz; Krzysztof Tokarz; Franciszek Janowiak

2001-01-01T23:59:59.000Z

6

Constant extension rate testing of Type 304L stainless steel in simulated waste tank environments. [Type 304L stainless steel  

SciTech Connect (OSTI)

New tanks for storage of low level radioactive wastes will be constructed at the Savannah River Site (SRS) of AISI Type 304L stainless steel (304L). The presence of chlorides and fluorides in the wastes may induce Stress Corrosion Cracking (SCC) in 304L. Constant Extension Rate Tests (CERT) were performed to determine the susceptibility of 304L to SCC in simulated wastes. In five of the six tests conducted thus far 304L was not susceptible to SCC in the simulated waste environments. Conflicting results were obtained in the final test and will be resolved by further tests. For comparison purposes the CERT tests were also performed with A537 carbon steel, a material similar to that utilized for the existing nuclear waste storage tanks at SRS.

Wiersma, B.J.

1992-01-01T23:59:59.000Z

7

Constant extension rate testing of Type 304L stainless steel in simulated waste tank environments  

SciTech Connect (OSTI)

New tanks for storage of low level radioactive wastes will be constructed at the Savannah River Site (SRS) of AISI Type 304L stainless steel (304L). The presence of chlorides and fluorides in the wastes may induce Stress Corrosion Cracking (SCC) in 304L. Constant Extension Rate Tests (CERT) were performed to determine the susceptibility of 304L to SCC in simulated wastes. In five of the six tests conducted thus far 304L was not susceptible to SCC in the simulated waste environments. Conflicting results were obtained in the final test and will be resolved by further tests. For comparison purposes the CERT tests were also performed with A537 carbon steel, a material similar to that utilized for the existing nuclear waste storage tanks at SRS.

Wiersma, B.J.

1992-11-01T23:59:59.000Z

8

Staying Informed | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Energy Assurance » Emergency Preparedness » Community Energy Assurance » Emergency Preparedness » Community Guidelines » Staying Informed Staying Informed Staying Informed Staying informed during an energy emergency will help you stay safe and know best how to respond. Pay close attention to reports from officials and energy suppliers using battery-operated radios, computers, mobile phones, other mobile devices, and even newspapers, if you have access to them. Officials and energy suppliers should communicate basic information about what to do during an emergency, and the status of restoration efforts. If you have power, charge your cell phones, laptops, and other mobile devices so they'll have the maximum amount of battery power stored in the event of a power outage. These devices will help you communicate

9

A Multilevel Model of RN Workgroup Intent to Stay  

E-Print Network [OSTI]

An understanding of how determinants of RN intent to stay on the unit vary by unit type is essential for developing the targeted retention strategies that are an important component of efforts to address the evolving nursing shortage. Relationships...

Miller, Peggy A.

2007-12-07T23:59:59.000Z

10

The short stay surgical center: an analysis.  

E-Print Network [OSTI]

??The Short Stay Surgical Center at West Valley Hospital in Encino, California, was incorporated into the hospital's services package in an effort to provide efficient (more)

Weber, Bruce Francis

1974-01-01T23:59:59.000Z

11

Short stay visa for the Netherlands  

E-Print Network [OSTI]

Short stay visa for the Netherlands #12;1. Why this publication? 2. Who is this publication. Application procedure 7. What should you do on arriving in the Netherlands? 8. Costs 9. Exceptional 15 Contents Immigration and Naturalisation Service | Short stay visa for the Netherlands 2 #12;This

van Suijlekom, Walter

12

Stay-Clean and Durable White Elastomeric Roof Coatings | Department...  

Broader source: Energy.gov (indexed) [DOE]

Stay-Clean and Durable White Elastomeric Roof Coatings Stay-Clean and Durable White Elastomeric Roof Coatings Lead Performer: Lawrence Berkeley National Laboratory - Berkeley, CA...

13

Summer/Fall 2014 STAY INFORMED!  

E-Print Network [OSTI]

Summer/Fall 2014 STAY INFORMED! Bridge: www.uleth.ca/bridge (Gateway to important resources, page 4.A./B.Mgt., B.Sc./B.Mgt., B.F.A. (New Media)/B.Mgt., B.H.Sc./B.Mgt., B.Mgt./B.Ed., and Post- Diploma B The Bridge..............................................................................4 Logging

Morris, Joy

14

Microsoft Word - Final stay rate 03.doc  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

1 1 Prepared by: Michael G. Finn Science and Engineering Education Program Oak Ridge Institute for Science and Education November 2003 All opinions expressed in this paper are the author's and do not necessarily reflect policies and views of the U.S. Department of Energy (DOE) or the Oak Ridge Institute for Science and Education (ORISE). This document was prepared for the Division of Science Resources Studies of the National Science Foundation by ORISE through an interagency agreement with DOE. ORISE is managed by Oak Ridge Associated Universities under DOE contract number DE-AC05-00OR22750. 1 Highlights This study used income and Social Security tax records to estimate the proportion of foreign doctorate recipients from U.S. universities who stayed in the United States after graduation. Findings include the

15

Does the nuclear heavy-ion cross section stay constant at ultra-relativistic energies?  

Science Journals Connector (OSTI)

We suggest that the nuclear contribution to the reaction cross section may increase with incident energy for heavy-ion collisions in the ultra-relativistic domain. We argue, using quasi-geometrical models, that this increase in the reaction cross section is directly related to the diffuseness of the nuclear surface. The available experimental data are at least not inconsistent with the existence of this effect.

T. Kodama; C.E. Aguiar; A.N.F. Aleixo; M.F. Barroso; R. Donangelo; S.J.B. Duarte; J.L. Neto

1991-01-01T23:59:59.000Z

16

Vibration Testing of Bridge Stay Cables to Obtain Damping Values  

Science Journals Connector (OSTI)

This paper discusses a series of tests performed on a cable stayed bridge in British Columbia, Canada to obtain the cable damping properties. Free vibration tests were performed on selected cables, in two phases:...

Martin E. Turek; Carlos E. Ventura; Khaled Shawwaf

2011-01-01T23:59:59.000Z

17

Legendary West Virginia Senior Citizen Stays Warm With New Furnace |  

Broader source: Energy.gov (indexed) [DOE]

Legendary West Virginia Senior Citizen Stays Warm With New Furnace Legendary West Virginia Senior Citizen Stays Warm With New Furnace Legendary West Virginia Senior Citizen Stays Warm With New Furnace April 1, 2010 - 7:16pm Addthis Joshua DeLung For the last 56 years, Beulah Sisk has lived in the same house in Princeton, W.Va. Beulah, who worked for 25 years at Lloyd's Pastry Shop, is well known in Princeton. People still see her on the streets today and recognize her as an icon in the community. After a wind storm damaged Beulah's home last year, it came as no surprise when a senior center employee, concerned for Beulah's safety, told her about the weatherization assistance program. "A tree fell on my house and damaged a lot of things, including my furnace," Beulah says. "I tried to have it repaired, but it still

18

Stay Warm in Your Apartment | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Stay Warm in Your Apartment Stay Warm in Your Apartment Stay Warm in Your Apartment October 19, 2009 - 11:43am Addthis Eric Barendsen Energy Technology Program Specialist, Office of Energy Efficiency and Renewable Energy Yes, the Ghost of Winters Future has officially knocked on our front doors again. The leaves here in Washington, D.C., have started to turn toward their colorful crescendo, that spectacular finish before their end on the chilly ground. It makes me cold just thinking about it. Like me, you're probably not opening your windows much at night anymore. I'm holding out still, surrendering a little more of my beloved fresh air each night and dreading that first night when I have to pop the heater on. Last night, I only open my window about an inch. I guess that means it's time to think about locking out the cold air once and for all this year.

19

Stay Warm in Your Apartment | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Stay Warm in Your Apartment Stay Warm in Your Apartment Stay Warm in Your Apartment October 19, 2009 - 11:43am Addthis Eric Barendsen Energy Technology Program Specialist, Office of Energy Efficiency and Renewable Energy Yes, the Ghost of Winters Future has officially knocked on our front doors again. The leaves here in Washington, D.C., have started to turn toward their colorful crescendo, that spectacular finish before their end on the chilly ground. It makes me cold just thinking about it. Like me, you're probably not opening your windows much at night anymore. I'm holding out still, surrendering a little more of my beloved fresh air each night and dreading that first night when I have to pop the heater on. Last night, I only open my window about an inch. I guess that means it's time to think about locking out the cold air once and for all this year.

20

Energy Audit Helps Small Company Stay Competitive | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Energy Audit Helps Small Company Stay Competitive Energy Audit Helps Small Company Stay Competitive Energy Audit Helps Small Company Stay Competitive January 12, 2010 - 12:22pm Addthis Joshua DeLung What are the key facts? The recommended improvements from an energy audit are saving the West Linn Paper Company in Oregon an annual cost of about $380,000. In tough economic times, employers across the country are looking for ways to save money and avoid layoffs. By improving energy efficiency, which also helps the environment and ultimately improves our country's security, companies can cut costs - not jobs. West Linn Paper Company in West Linn, Ore., achieves an annual cost savings of about $380,000 thanks to improvements made at the recommendation of the Energy Now through a 2006 Save Energy Now assessment. The savings

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


21

STAY TO THE RIGHT ON UNION STREET Roosevelt Road  

E-Print Network [OSTI]

STAY TO THE RIGHT ON UNION STREET Roosevelt Road NORTH HalstedStreet UnionAvenue Rochford Street Maxwell Street I-94DanRyanExpressway MXPS Maxwell Street Parking Structure X Stukel Towers (student onto W. Roosevelt Rd. Turn left at the first light onto S. Union Ave. From the North I-90 E

Illinois at Chicago, University of

22

1. Physical constants 1 1. PHYSICAL CONSTANTS  

E-Print Network [OSTI]

1. Physical constants 1 1. PHYSICAL CONSTANTS Table 1.1. Reviewed 2011 by P.J. Mohr (NIST). Mainly in parentheses after the values give the 1-standard-deviation uncertainties in the last digits; the corresponding also P.J. Mohr and D.B. Newell, "Resource Letter FC-1: The Physics of Fundamental Constants," Am. J

23

Factors influencing self-drive vacation travellers' length of stay  

Science Journals Connector (OSTI)

The current research investigated the self-drive vacation travel market, examining determinants for demand for accommodations and the effects of external economic changes (e.g., fuel price fluctuation) on tourism. The study analysed data from two government data sources, a special survey module in the National Household Travel Survey which examined long distance trips, and the gas price index from the US Energy Information Administration. The present study compared two mainstream segments of the self-drive vacation market, which are self-drive vacation staying at commercial lodging facilities (SDV-lodging) and self-drive vacation staying at a friend or relative's accommodations (SDV-FR). Using the 2SLS model, the effects of the socio-demographic variables and travel-related variables were tested statistically. Statistical results showed that an endogeneity issue occurred in the SDV-lodging segment, revealing that 2SLS is better than the OLS estimation.

Sangchoul Yi; Jonathon Day; Liping A. Cai

2013-01-01T23:59:59.000Z

24

Constant Speed for Processing  

Science Journals Connector (OSTI)

Synduction motor combines constant speed of synchronous motor with ruggedness of induction motor ... CONVENTIONAL SYNCHRONOUS ELECTRIC MOTORS operate at constant speed, regardless of load and voltagefrequency is the determining factor. ...

1956-04-23T23:59:59.000Z

25

Identification of weak non-linearities in cables of cable-stayed footbridges  

Science Journals Connector (OSTI)

A time-frequency identification technique for the non-linear identification of a cable element was proposed in this paper. A polynomial form of non-parametric method was used. A long cable of a newly constructed cable-stayed footbridge was modelled in the ANSYS structural software. The model was reduced to a SDoF system, by applying a harmonic force in the first modal frequency and the first mode shape. A good match between the identified and numerical data was obtained. Some interesting non-linear phenomena were observed: only a cubic type of non-linearity was identified. Moreover, the values of the damping and cubic parameters stabilised at higher load amplitudes. However, parameter relevant to linear-frequency was increasing with the loading amplitude showing a typical hardening behaviour of cable structures. Superharmonics were present in the response at higher loading amplitudes. Therefore, the identification procedure was found to be effective at higher load amplitudes.

Anil Kumar; Luca Zanotti Fragonara

2013-01-01T23:59:59.000Z

26

constant.inc  

E-Print Network [OSTI]

... with 1(read) completion } { 2 for status, and 3 for DMA control } { constants below for IBM DTC51C interface board } hddata = 0; { data port, bidirectional } hdcon...

27

STAY INFORMED! Bridge: www.uleth.ca/bridge (Gateway to important resources, page 4)  

E-Print Network [OSTI]

Fall 2014 STAY INFORMED! Bridge: www.uleth.ca/bridge (Gateway to important resources, page 4 ...................................................................................... 4 The Bridge .................................................................................. 4 Logging in to the Bridge........................................................... 4 Paying

Morris, Joy

28

Genetic analysis of the Sorghum bicolor stay-green drought tolerance trait  

E-Print Network [OSTI]

early under post-anthesis drought. Eight sources of stay-green have been identified in the sorghum germplasm collection, most originating from Sudan and Ethiopia. The diversity of the eight sources of stay- green was analyzed using 55 simple sequence... repeats (SSR) markers with genome coverage. This analysis showed that the sources of stay-green are quite diverse and can be divided into five groups based on race or working group. Three sources of stay-green have been used to identify 12 major...

Harris, Karen Ruth

2009-05-15T23:59:59.000Z

29

How Do You Save Energy and Stay Cool While Cooking in the Summer? |  

Broader source: Energy.gov (indexed) [DOE]

and Stay Cool While Cooking in the Summer? and Stay Cool While Cooking in the Summer? How Do You Save Energy and Stay Cool While Cooking in the Summer? August 19, 2010 - 7:30am Addthis On Monday, Andrea discussed some ways you can keep cooking during the summer while saving energy and staying cool. How do you save energy and stay cool while cooking in the summer? Each Thursday, you have the chance to share your thoughts on a question about energy efficiency or renewable energy for consumers. Please comment with your answers, and also feel free to respond to other comments. E-mail your responses to the Energy Saver team at consumer.webmaster@nrel.gov. Addthis Related Articles How Do You Save Energy in the Summer? How Do You Save Energy When Entertaining in the Summer? At What Temperature Do You Set Your Thermostat in the Summer

30

Valuable bridges : cable-stayed bridges and value engineering in American civil engineering culture, 1969-1979  

E-Print Network [OSTI]

A history and theory of cable-stayed bridges in the context of a cultural discourse on civil construction projects' value, this thesis studies the significance of cable-stayed bridge designs to 'value engineering' objectives ...

Samuels, Fallon M. (Fallon Michele)

2007-01-01T23:59:59.000Z

31

Cosmology with varying constants  

Science Journals Connector (OSTI)

...with a varying constant, say c, one can always, by a suitable rede nition of units of measurement, transform it into another theory...it follows that all we have to do is carry out appropriate rede nitions of our units of length, time and energy. Again, these...

2002-01-01T23:59:59.000Z

32

The fundamental constants and theory  

Science Journals Connector (OSTI)

...1. Introduction The fundamental constants appear as parameters...least-squares adjustment of the fundamental constants (Mohr Taylor...are the following: How does theory enter into the CODATA evaluation of the fundamental constants? What are the...

2005-01-01T23:59:59.000Z

33

Save Money and Stay Cool with an Efficient, Well-Maintained Air Conditioner  

Broader source: Energy.gov (indexed) [DOE]

Save Money and Stay Cool with an Efficient, Well-Maintained Air Save Money and Stay Cool with an Efficient, Well-Maintained Air Conditioner Save Money and Stay Cool with an Efficient, Well-Maintained Air Conditioner June 29, 2010 - 7:30am Addthis Eric Barendsen Energy Technology Program Specialist, Office of Energy Efficiency and Renewable Energy OK. It's officially summer here in Washington, D.C. I'm seeking the coolest, shadiest places possible as I get ready for the hottest few months of the year. It's already been a hot June in much of the country, and it may end up being one of the hottest Junes on record in DC. Naturally, I'm starting to think about how I'm going to stay cool this summer, while trying to minimize my energy use. Drew provided some excellent tips on summertime energy savings in his blog post two weeks ago,

34

DOE's Energy Savers Website Helps Consumers "Stay Warm, Save Money" |  

Broader source: Energy.gov (indexed) [DOE]

Energy Savers Website Helps Consumers "Stay Warm, Save Money" Energy Savers Website Helps Consumers "Stay Warm, Save Money" DOE's Energy Savers Website Helps Consumers "Stay Warm, Save Money" October 1, 2008 - 3:43pm Addthis DOE Helps Americans Be Energy Efficient at Home and Save on Energy Costs WASHINGTON - The U.S. Department of Energy (DOE) today, on the first day of Energy Awareness Month, launched the Stay Warm, Save Money website and educational outreach campaign to help consumers be more energy efficient and save on energy costs. The information focuses on proactive ways to implement simple, cost-effective, energy saving solutions for both homes and businesses this winter and will expand to year-round home energy efficient tips. The site also features the Department's work to develop

35

How Do You Stay Warm While Saving Money and Energy in Extreme Weather? |  

Broader source: Energy.gov (indexed) [DOE]

How Do You Stay Warm While Saving Money and Energy in Extreme How Do You Stay Warm While Saving Money and Energy in Extreme Weather? How Do You Stay Warm While Saving Money and Energy in Extreme Weather? February 3, 2011 - 6:30am Addthis Many states are getting extreme weather this week, with deep freezes, huge blizzards, and ice storms causing various problems across the country. Such weather can cause us to use energy a bit differently to stay warm and keep things running. Depending on where you are, you may be keeping the faucet dripping (so pipes don't freeze), your furnace might be working overtime in the cold, or you may be spending extra time warming up your car. In extreme conditions, it's important to be safe and take your own home and needs into account when taking these extra measures, while still considering your energy use and costs. For example, are your pipes in a

36

Staying on Track for a Career in R&D|GE Global Researh  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

year I had a wonderful opportunity to give an invited talk at MS&T 2013 in Montreal, Quebec, Canada on staying on track in a career as a female scientist in an R&D environment....

37

CFD Numerical Simulation of Vortex-Induced Vibration of a Stay Cable under a Wind Profile  

Science Journals Connector (OSTI)

VIV (Vortex-induced vibration) of a stay cable subjected to a wind profile is numerically simulated through combining CFD ... numerical model. Under a profile of mean wind speed, unsteady aerodynamic lift coeffic...

Wenli Chen; Hui Li

2009-01-01T23:59:59.000Z

38

End of Semester Tune-Up Staying on Top of Stress  

E-Print Network [OSTI]

End of Semester Tune-Up Staying on Top of Stress Bishop's University Counselling and Employment and that give you an energy boost. 3) Socializing time; it is important that you spend time on a regular basis

39

Save Money and Stay Cool with an Efficient, Well-Maintained Air Conditioner  

Broader source: Energy.gov (indexed) [DOE]

Save Money and Stay Cool with an Efficient, Well-Maintained Air Save Money and Stay Cool with an Efficient, Well-Maintained Air Conditioner Save Money and Stay Cool with an Efficient, Well-Maintained Air Conditioner June 29, 2010 - 7:30am Addthis Eric Barendsen Energy Technology Program Specialist, Office of Energy Efficiency and Renewable Energy OK. It's officially summer here in Washington, D.C. I'm seeking the coolest, shadiest places possible as I get ready for the hottest few months of the year. It's already been a hot June in much of the country, and it may end up being one of the hottest Junes on record in DC. Naturally, I'm starting to think about how I'm going to stay cool this summer, while trying to minimize my energy use. Drew provided some excellent tips on summertime energy savings in his blog post two weeks ago,

40

Ultrasonic signatures of idealized grout defects in polyethylene-sleeved cable stays  

E-Print Network [OSTI]

) Sreenivas Nakirekanti, B. Tech. , Jawaharlal Nehru Technological University Co-Chairs of Advisory Committee: Dr. Don E. Bray Dr. Ray W. James An ultrasonic nondestructive inspection technique has been investigated for inspecting bridge cable stays... conditions. Longitudinal and radial holes of different sizes were drilled in these samples for ultrasonic experimental analysis. Based on the results of the experiments, a method is proposed to effectively inspect these cable stays under field conditions...

Nakirekanti, Sreenivas

2012-06-07T23:59:59.000Z

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


41

Constant voltage ultracapacitor  

Science Journals Connector (OSTI)

Ultracapacitors have attracted lots of attention recently due to their growing use in hybrid vehicles and in energy storage applications for the smart grid. A very undesirable feature of ultracapacitors is the fact that the voltage drops as the capacitor is discharged. DC-DC converters are employed at present to convert the voltage of the ultracapacitor to constant voltage; however these converters typically do not operate if the voltage of the ultracapacitor drops below 1?V. In addition DC-DC converters suffer from well-known size/efficiency tradeoffs. This paper introduces a novel new ultracapacitor that is characterized by constant voltage. The new ultracapacitor does not utilize familiar energy conversion principles. Rather operation depends on an embedded electromechanical system that actually alters the capacitance of the ultracapacitor as the device is discharged. Due to a simple proportionality relationship between charge capacitance and voltage the voltage remains constant. Theoretical and experimental investigations have shown that the embedded mechanism for altering the capacitance has an efficiency of 99% or higher.

Ezzat G. Bakhoum

2012-01-01T23:59:59.000Z

42

Unitaxial constant velocity microactuator  

DOE Patents [OSTI]

A uniaxial drive system or microactuator capable of operating in an ultra-high vacuum environment is disclosed. The mechanism includes a flexible coupling having a bore therethrough, and two clamp/pusher assemblies mounted in axial ends of the coupling. The clamp/pusher assemblies are energized by voltage-operated piezoelectrics therewithin to operatively engage the shaft and coupling causing the shaft to move along its rotational axis through the bore. The microactuator is capable of repeatably positioning to sub-nanometer accuracy while affording a scan range in excess of 5 centimeters. Moreover, the microactuator generates smooth, constant velocity motion profiles while producing a drive thrust of greater than 10 pounds. The system is remotely controlled and piezoelectrically driven, hence minimal thermal loading, vibrational excitation, or outgassing is introduced to the operating environment. 10 figs.

McIntyre, T.J.

1994-06-07T23:59:59.000Z

43

Stay Up To Date on Hurricane Sandy Recovery Efforts | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Stay Up To Date on Hurricane Sandy Recovery Efforts Stay Up To Date on Hurricane Sandy Recovery Efforts Stay Up To Date on Hurricane Sandy Recovery Efforts November 2, 2012 - 2:57pm Addthis The Google Crisis Map has power outage information, shelter and recovery centers, local emergency Twitter feeds, FEMA disaster declared areas and more. | This map is created and maintained by Google.org. To find your location, either enter your location in the box in the upper left corner or click and drag the map. Use the "Layers" button to select which data to display. Amanda Scott Amanda Scott Former Managing Editor, Energy.gov The Obama Administration is working around the clock to support the impacted states and utilities. To keep up to date with the Federal Government's response efforts, visit some of the site listed below.

44

Stay Warm and Save Money This Winter with Tips from the Energy Department |  

Broader source: Energy.gov (indexed) [DOE]

Stay Warm and Save Money This Winter with Tips from the Energy Stay Warm and Save Money This Winter with Tips from the Energy Department Stay Warm and Save Money This Winter with Tips from the Energy Department December 19, 2011 - 1:24pm Addthis Department of Energy headquarters during the winter months. | DOE file photo. Department of Energy headquarters during the winter months. | DOE file photo. What does this mean for me? Help your family save money by saving energy with these tips this winter. Click "start now" on Benefits.gov to find out if you're eligible for government assistance, including energy-related costs. Editor's note: This article was originally posted on Benefits.gov. As the days get shorter and temperatures get cooler, those energy bills seem to just keep going up. The average American spends around $2,000 per household on energy costs

45

PNNL Helps the Navy Stay Cool and Conserve Fuel | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

PNNL Helps the Navy Stay Cool and Conserve Fuel PNNL Helps the Navy Stay Cool and Conserve Fuel PNNL Helps the Navy Stay Cool and Conserve Fuel July 30, 2013 - 3:33pm Addthis As a Laboratory Fellow at the Energy Department's Pacific Northwest National Laboratory, Pete McGrail and his team are working to develop a more efficient adsorption chiller that could help the Navy cut its fuel costs. | Photo courtesy of Pacific Northwest National Laboratory. As a Laboratory Fellow at the Energy Department's Pacific Northwest National Laboratory, Pete McGrail and his team are working to develop a more efficient adsorption chiller that could help the Navy cut its fuel costs. | Photo courtesy of Pacific Northwest National Laboratory. Andrew Gumbiner Contractor, Advanced Research Projects Agency-Energy. What are the key facts?

46

Alabama Family Staying Nice and Cozy This Fall | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Alabama Family Staying Nice and Cozy This Fall Alabama Family Staying Nice and Cozy This Fall Alabama Family Staying Nice and Cozy This Fall December 2, 2009 - 5:49pm Addthis Joshua DeLung What are the key facts? The Community Action Agency of Talladega, Clay, Calhoun, Randolph and Cleburne Counties received about $1.8 million in Recovery Act money to weatherize homes and is assessing 60 to 70 homes each month. Mary's energy bill is about $300 cheaper now, and she no longer has to take extreme measures to keep her and her three children and grandchild warm. In the winter months, Mary Taylor felt a chilly draft billowing through her Talladega, Ala., home. The energy bills were mounting up higher and higher. In the summer, the sweltering southern heat was too much for her air conditioner to handle, as the cool air leaked out of house as quickly as

47

Come for Solar Decathlon, Stay for the Clean Energy XPO | Department of  

Broader source: Energy.gov (indexed) [DOE]

Come for Solar Decathlon, Stay for the Clean Energy XPO Come for Solar Decathlon, Stay for the Clean Energy XPO Come for Solar Decathlon, Stay for the Clean Energy XPO September 27, 2013 - 9:49am Addthis In early January 2013, Solar Decathlon teams gathered at the competition site in Irvine, California. | Photo courtesy of Stefano Paltera, Energy Department. In early January 2013, Solar Decathlon teams gathered at the competition site in Irvine, California. | Photo courtesy of Stefano Paltera, Energy Department. Richard King Director, Solar Decathlon How can I participate? Hosted alongside the Solar Decathlon, the clean energy XPO showcases technology innovations and sustainable living through fun, interactive exhibits and activities. Both are open to the public free of charge from 11 a.m. to 7 p.m. on Oct. 3-6 and Oct. 10-13.

48

Stay Up To Date on Hurricane Sandy Recovery Efforts | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Stay Up To Date on Hurricane Sandy Recovery Efforts Stay Up To Date on Hurricane Sandy Recovery Efforts Stay Up To Date on Hurricane Sandy Recovery Efforts November 2, 2012 - 2:57pm Addthis The Google Crisis Map has power outage information, shelter and recovery centers, local emergency Twitter feeds, FEMA disaster declared areas and more. | This map is created and maintained by Google.org. To find your location, either enter your location in the box in the upper left corner or click and drag the map. Use the "Layers" button to select which data to display. Amanda Scott Amanda Scott Former Managing Editor, Energy.gov The Obama Administration is working around the clock to support the impacted states and utilities. To keep up to date with the Federal Government's response efforts, visit some of the site listed below.

49

New Ways to Stay Engaged on Energy.gov | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

New Ways to Stay Engaged on Energy.gov New Ways to Stay Engaged on Energy.gov New Ways to Stay Engaged on Energy.gov September 24, 2013 - 5:49pm Addthis The Energy Departments headquarters at the Forrestal Building in Washington, DC. | Energy Department photo, credit Quentin Kruger. The Energy Departments headquarters at the Forrestal Building in Washington, DC. | Energy Department photo, credit Quentin Kruger. Erin R. Pierce Erin R. Pierce Digital Communications Specialist, Office of Public Affairs Every day on Energy.gov, we strive to provide you with the latest updates on how the Energy Department is meeting its mission. From innovative research at our National Labs to progress in advancing the Presidents climate agenda, Energy.gov online content is part of our ongoing commitment to share who we are, what we do and why it matters to you.

50

New Ways to Stay Engaged on Energy.gov | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Ways to Stay Engaged on Energy.gov Ways to Stay Engaged on Energy.gov New Ways to Stay Engaged on Energy.gov September 24, 2013 - 5:49pm Addthis The Energy Departments headquarters at the Forrestal Building in Washington, DC. | Energy Department photo, credit Quentin Kruger. The Energy Departments headquarters at the Forrestal Building in Washington, DC. | Energy Department photo, credit Quentin Kruger. Erin R. Pierce Erin R. Pierce Digital Communications Specialist, Office of Public Affairs Every day on Energy.gov, we strive to provide you with the latest updates on how the Energy Department is meeting its mission. From innovative research at our National Labs to progress in advancing the Presidents climate agenda, Energy.gov online content is part of our ongoing commitment to share who we are, what we do and why it matters to you.

51

Stay Warm and Save Money This Winter with Tips from the Energy Department |  

Broader source: Energy.gov (indexed) [DOE]

Stay Warm and Save Money This Winter with Tips from the Energy Stay Warm and Save Money This Winter with Tips from the Energy Department Stay Warm and Save Money This Winter with Tips from the Energy Department December 19, 2011 - 1:24pm Addthis Department of Energy headquarters during the winter months. | DOE file photo. Department of Energy headquarters during the winter months. | DOE file photo. What does this mean for me? Help your family save money by saving energy with these tips this winter. Click "start now" on Benefits.gov to find out if you're eligible for government assistance, including energy-related costs. Editor's note: This article was originally posted on Benefits.gov. As the days get shorter and temperatures get cooler, those energy bills seem to just keep going up. The average American spends around $2,000 per household on energy costs

52

Get Ready for Fall: Leaf Peeping, Staying Warm, and Saving Money |  

Broader source: Energy.gov (indexed) [DOE]

Ready for Fall: Leaf Peeping, Staying Warm, and Saving Money Ready for Fall: Leaf Peeping, Staying Warm, and Saving Money Get Ready for Fall: Leaf Peeping, Staying Warm, and Saving Money September 21, 2009 - 3:04pm Addthis Allison Casey Senior Communicator, NREL Tomorrow is the official first day of fall, and while I always mourn the end of summer, one of the best things about fall is leaf peeping! Last year, we took my father-in-law's red '57 T-bird convertible on a lovely drive through the mountains to see the bright yellow aspens. Something about a car like that draws lots of attention-honks, waves, questions. We basically made friends everywhere we went. As much fun as that was, it wasn't exactly the most fuel-efficient or environmentally friendly excursion. I know we can do better this year; beautiful leaves are less than an hour's

53

Heating Up While Staying Cool? | U.S. DOE Office of Science (SC)  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Heating Up While Staying Cool? Heating Up While Staying Cool? Discovery & Innovation Stories of Discovery & Innovation Brief Science Highlights SBIR/STTR Highlights Contact Information Office of Science U.S. Department of Energy 1000 Independence Ave., SW Washington, DC 20585 P: (202) 586-5430 04.30.13 Heating Up While Staying Cool? Exotic effects at the nanoscale could help shape the future of electronics. Print Text Size: A A A Subscribe FeedbackShare Page Click to enlarge photo. Enlarge Photo An image of a remote Joule heating. Image courtesy of John Cumings Artist's rendering of remote Joule heating. Silver blocks are palladium plates. Carbon nanotube is shown in dark blue. If you had to summarize the biggest challenge confronting the field of electronics in a single word today, you might well say, "heat." With the

54

Recovery Act Helps Fuel Cell Company Stay on Course | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Recovery Act Helps Fuel Cell Company Stay on Course Recovery Act Helps Fuel Cell Company Stay on Course Recovery Act Helps Fuel Cell Company Stay on Course January 7, 2010 - 3:41pm Addthis Joshua DeLung An innovative company in Billerica, Mass., is taking steps to equip a major supermarket chain in the Southwest with high-performance, clean-energy fuel cells for its hundreds-strong forklift fleet. In a recently-started pilot program helped along by money from the Recovery Act, Nuvera Fuel Cells Inc. upgraded 14 forklifts at the South Texas distribution center of H-E-B to test the performance of fuel cells. If H-E-B likes the results, it could deploy additional fuel cells in its forklifts and Nuvera could start hiring new workers into more than 100 green jobs beginning as soon as January 2010. But first, the technology must prove itself on the warehouse floor.

55

Recovery Act Helps Fuel Cell Company Stay on Course | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Helps Fuel Cell Company Stay on Course Helps Fuel Cell Company Stay on Course Recovery Act Helps Fuel Cell Company Stay on Course January 7, 2010 - 3:41pm Addthis Joshua DeLung An innovative company in Billerica, Mass., is taking steps to equip a major supermarket chain in the Southwest with high-performance, clean-energy fuel cells for its hundreds-strong forklift fleet. In a recently-started pilot program helped along by money from the Recovery Act, Nuvera Fuel Cells Inc. upgraded 14 forklifts at the South Texas distribution center of H-E-B to test the performance of fuel cells. If H-E-B likes the results, it could deploy additional fuel cells in its forklifts and Nuvera could start hiring new workers into more than 100 green jobs beginning as soon as January 2010. But first, the technology must prove itself on the warehouse floor.

56

How Do You Stay Cool and Comfortable in Hot Weather? | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Cool and Comfortable in Hot Weather? Cool and Comfortable in Hot Weather? How Do You Stay Cool and Comfortable in Hot Weather? May 28, 2009 - 5:25pm Addthis As you may have read on the blog over the past few weeks, the Stay Cool, Save Money site offers no-cost and low-cost tips for saving energy during the warm summer months, as well as ideas for long-term investments to help you save year round. Whether you rely on an air conditioner, strategically opened windows (and closed shades), fans, regular dips in the pool, or some other strategy entirely, tell us: How do you stay cool and comfortable in hot weather? Each Thursday, you have the chance to share your thoughts on a topic related to energy efficiency or renewable energy for consumers. Please comment with your answers, and also feel free to respond to other comments.

57

An energy harvesting system using the wind-induced vibration of a stay cable for powering  

Science Journals Connector (OSTI)

This paper proposes an electromagnetic energy harvesting system, which utilizes the wind-induced vibration of a stay cable, and investigates its feasibility for powering a wireless sensor node on the cable through numerical simulations as well as experimental tests. To this end, the ambient acceleration responses of a stay cable installed in an in-service cable-stayed bridge are measured, and then they are used as input excitations in cases of both numerical simulations and experimental tests to evaluate the performance of the proposed energy harvesting system. The results of the feasibility test demonstrate that the proposed system generates sufficient electricity for operation of a wireless sensor node attached on the cable under the moderate wind conditions.

Hyung-Jo Jung; In-Ho Kim; Seon-Jun Jang

2011-01-01T23:59:59.000Z

58

Retiree Heads Back to Work, Helps Families Stay Afloat | Department of  

Broader source: Energy.gov (indexed) [DOE]

Retiree Heads Back to Work, Helps Families Stay Afloat Retiree Heads Back to Work, Helps Families Stay Afloat Retiree Heads Back to Work, Helps Families Stay Afloat November 10, 2009 - 7:17pm Addthis Mark Morris inspects a furnace. | File photo Mark Morris inspects a furnace. | File photo Joshua DeLung Getting laid off wasn't the only thing putting Americans in a pickle when the recession hit. Mark Morris of South Bend, Ind., is among many in the country who were already retired, but whose 401(k) account took a big hit when the stock market crashed. Mark had retired as a utility-company supervisor in mid-2007, but he lost 40 percent of his retirement money and knew he had to go back to work. So Mark made what he could by working part-time gigs until he heard about a job in September with a local community action agency where he would

59

Irrationality of the Zeta Constants  

E-Print Network [OSTI]

A general technique for proving the irrationality of the zeta constants z(s) for odd s = 2n + 1 => 3 from the known irrationality of the beta constants L(2n+1) is developed in this note. The results on the irrationality of the zeta constants z(2n), n => 1, and z(3) are well known, but the results on the irrationality for the zeta constants z(2n+1), n => 2, are new, and these results seem to confirm that these constants are irrational numbers. In addition, a result on the irrationality measures indicates that mu(L(2n+1)) <= mu(z(2n+1)).

N. A. Carella

2014-04-08T23:59:59.000Z

60

Reliability concerns with logical constants in Xilinx FPGA designs  

SciTech Connect (OSTI)

In Xilinx Field Programmable Gate Arrays logical constants, which ground unused inputs and provide constants for designs, are implemented in SEU-susceptible logic. In the past, these logical constants have been shown to cause the user circuit to output bad data and were not resetable through off-line rcconfiguration. In the more recent devices, logical constants are less problematic, though mitigation should still be considered for high reliability applications. In conclusion, we have presented a number of reliability concerns with logical constants in the Xilinx Virtex family. There are two main categories of logical constants: implicit and explicit logical constants. In all of the Virtex devices, the implicit logical constants are implemented using half latches, which in the most recent devices are several orders of magnitudes smaller than configuration bit cells. Explicit logical constants are implemented exclusively using constant LUTs in the Virtex-I and Virtex-II, and use a combination of constant LUTs and architectural posts to the ground plane in the Virtex-4. We have also presented mitigation methods and options for these devices. While SEUs in implicit and some types of explicit logical constants can cause data corrupt, the chance of failure from these components is now much smaller than it was in the Virtex-I device. Therefore, for many cases, mitigation might not be necessary, except under extremely high reliability situations.

Quinn, Heather M [Los Alamos National Laboratory; Graham, Paul [Los Alamos National Laboratory; Morgan, Keith [Los Alamos National Laboratory; Ostler, Patrick [Los Alamos National Laboratory; Allen, Greg [JPL; Swift, Gary [XILINX; Tseng, Chen W [XILINX

2009-01-01T23:59:59.000Z

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


61

Stay Cool for Less Money with a Ceiling Fan | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Stay Cool for Less Money with a Ceiling Fan Stay Cool for Less Money with a Ceiling Fan Stay Cool for Less Money with a Ceiling Fan May 12, 2009 - 5:00am Addthis Allison Casey Senior Communicator, NREL After a few late snowstorms here in Colorado, I am more than ready to turn off the heat and enjoy some warm spring weather. We haven't had any heat waves here yet, but many of you have already been trying to stay cool; our friends in Washington, D.C. were sweltering (by comparison) in 90+°F weather just a couple short weeks ago! Whether you're still anticipating snow or have broken out the sandals and tank tops, you may be starting to think about keeping your summer cooling costs down. One easy way to keep cool while saving money is using a ceiling fan. Did you know that a ceiling fan could allow you to raise the thermostat

62

MODELLING THE HUMAN INDUCED VIBRATIONS IN ACABLE-STAYED PEDESTRIAN TIMBER BRIDGE  

E-Print Network [OSTI]

MODELLING THE HUMAN INDUCED VIBRATIONS IN ACABLE-STAYED PEDESTRIAN TIMBER BRIDGE Sara Casciati1 on a pedestrian timber bridge under different "moving" loads configurations are reported and analysed by applying behavior of the bridge under the above loads. A first in situ experimental campaign was carried out

Boyer, Edmond

63

Staying Green at the Extreme : Exploring Energy Challenges and Tradeoffs for  

E-Print Network [OSTI]

hierarchies) and applications (e.g., coupled simulation workflows) from an energy perspective and investigate5/13/13 1 Staying Green at the Extreme : Exploring Energy Challenges and Tradeoffs for Science Informatics Institute (RDI2) Professor, Department of Electrical & Computer Engineering Rutgers Discovery

Parashar, Manish

64

The Hubble constant and dark energy from cosmological distance measures  

E-Print Network [OSTI]

We study how the determination of the Hubble constant from cosmological distance measures is affected by models of dark energy and vice versa. For this purpose, constraints on the Hubble constant and dark energy are investigated using the cosmological observations of cosmic microwave background, baryon acoustic oscillations and type Ia suprenovae. When one investigates dark energy, the Hubble constant is often a nuisance parameter, thus it is usually marginalized over. On the other hand, when one focuses on the Hubble constant, simple dark energy models such as a cosmological constant and a constant equation of state are usually assumed. Since we do not know the nature of dark energy yet, it is interesting to investigate the Hubble constant assuming some types of dark energy and see to what extent the constraint on the Hubble constant is affected by the assumption concerning dark energy. We show that the constraint on the Hubble constant is not affected much by the assumption for dark energy. We furthermore show that this holds true even if we remove the assumption that the universe is flat. We also discuss how the prior on the Hubble constant affects the constraints on dark energy and/or the curvature of the universe.

Kazuhide Ichikawa; Tomo Takahashi

2007-10-22T23:59:59.000Z

65

ANALYSIS OF A BRIDGE DECK BUILT on U.S. HIGHWAY 151 WITH FRP STAY-IN-PLACE  

E-Print Network [OSTI]

ANALYSIS OF A BRIDGE DECK BUILT on U.S. HIGHWAY 151 WITH FRP STAY-IN-PLACE FORMS, FRP GRIDS;ANALYSIS OF A BRIDGE DECK BUILT on U.S. HIGHWAY 151 WITH FRP STAY-IN-PLACE FORMS, GRIDS, AND REBARS University of Wisconsin - Madison #12;i Abstract This thesis details the construction of a bridge built on U

Bank, Lawrence C.

66

How Do You Stay Warm While Saving Money and Energy in Extreme Weather? |  

Broader source: Energy.gov (indexed) [DOE]

Warm While Saving Money and Energy in Extreme Warm While Saving Money and Energy in Extreme Weather? How Do You Stay Warm While Saving Money and Energy in Extreme Weather? February 3, 2011 - 6:30am Addthis Many states are getting extreme weather this week, with deep freezes, huge blizzards, and ice storms causing various problems across the country. Such weather can cause us to use energy a bit differently to stay warm and keep things running. Depending on where you are, you may be keeping the faucet dripping (so pipes don't freeze), your furnace might be working overtime in the cold, or you may be spending extra time warming up your car. In extreme conditions, it's important to be safe and take your own home and needs into account when taking these extra measures, while still considering your energy use and costs. For example, are your pipes in a

67

Stay Active this Summer (and Save Energy, Money, and the Environment too!)  

Broader source: Energy.gov (indexed) [DOE]

Active this Summer (and Save Energy, Money, and the Active this Summer (and Save Energy, Money, and the Environment too!) Stay Active this Summer (and Save Energy, Money, and the Environment too!) August 8, 2012 - 2:14pm Addthis John Chu John Chu Communications Specialist with the Office of Energy Efficiency and Renewable Energy Many of us are looking to spend more time outdoors. Like many Americans, I'm thinking about ways to stay physically active and seize the sunny day. Here are five easy things that you can do this summer that will not only help keep you active and get you some Vitamin D, but save money, energy, and the environment too: Bike or walk to work instead of driving. This is a great way to get exercise and save money on gas costs and parking fees, as well as reduce carbon emissions. Walk, run, or exercise outside instead of using a treadmill or

68

Paper Publishing is Here to Stay: The Cambridge Planetary Handbook by Michael E Bakich, 1999, Cambridge University Press, 19.95, hbk, ISBN 0 521 63280 3  

Science Journals Connector (OSTI)

......Stay: The Cambridge Planetary Handbook by Michael E Bakich, 1999...stay The Cambridge Planetary Handbook by Michael E Bakich, 1999...Bakich's Cambridge Planetary Handbook is a scholarly guide to the...presentations compare? What does the electronic presentation......

Sue Bowler

2000-04-01T23:59:59.000Z

69

Ambient Vibration Study of the Gi-Lu Cable-Stay Bridge: Application of Wireless Sensing Units  

E-Print Network [OSTI]

Ambient Vibration Study of the Gi-Lu Cable-Stay Bridge: Application of Wireless Sensing Units Kung-Chun Lu1 , Yang Wang2 , J. P. Lynch3 , C. H. Loh1 Yen-Jiun Chen1 , P. Y. Lin4 , Z. K. Lee4 1 Department of a 240 meter cable-stayed bridge ­Gi-Lu Bridge in Nan-Tou County, Taiwan. A MEMS-based wireless sensor

Stanford University

70

Cosmological models with variable constants  

E-Print Network [OSTI]

The behavior of the constants, G,c,h,a,e,m and Lambda, considering them as variable, in the framework of a flat cosmological model with FRW symmetries described by a bulk viscous fluid and considering mechanisms of adiabatic matter creation are investigated. Within two models; one with radiation predominance and another of matter predominance, this behavior are studied.

J. A. Belinchon

1999-07-01T23:59:59.000Z

71

Fundamental Constants of the Muon  

Science Journals Connector (OSTI)

Three precise measurements exist on static properties of the muon. These are the g factor, g-2, and the frequency of the 3D-2P transition in mesonic phosphorus. They are combined to obtain the best fit to the fundamental constants of the muon.

G. Shapiro and L. M. Lederman

1962-02-01T23:59:59.000Z

72

The relationship between body weight, length of stay, medical expenses, and type of illness in the hospital population  

E-Print Network [OSTI]

in the United States, and the number of obese Americans is still increasing (4-6). Obesity is associated with an increase in the incidence of coronary artery disease, diabetes, hypertension, cancer, gout, gallbladder disease, osteoarthritis of the weight... and has been identified as a risk factor that may lead to many chronic diseases and exacerbate many chronic conditions. Studies have shown that the incidence of coronary artery ~ diabetes, hypertension, cancer, gout, gallbladder disease, osteoarthritis...

Morat, Michelle Elizabeth

2012-06-07T23:59:59.000Z

73

CALCULATING OPTICAL CONSTANTS OF GLAZING MATERIALS  

E-Print Network [OSTI]

Solar Energy CALCULATING OPTICAL CONSTANTS OF GLAZING MATERIALS Michael Rub August 1981 TWO-WEEK LOAN

Rubin, Michael

2013-01-01T23:59:59.000Z

74

Questions and Answers - Why do protons and neutrons stay together in the  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Charge of proton and neutron? Charge of proton and neutron? Previous Question (Charge of proton and neutron?) Questions and Answers Main Index Next Question (How many times bigger is a proton than an electron?) How many times bigger isa proton than an electron? Why do protons and neutrons stay together in the nucleus? The nucleus of an atom is held together by the strong nuclear force that binds together protons and neutrons. Although the strong nuclear force is the strongest of the four fundamental forces, it acts only over very short - typically nuclear - distances. It binds together the protons and neutrons in the nucleus. It also holds together the quarks that make up those protons and neutrons and the other hadrons. Author: Mac Mestayer, Staff Scientist (Other answers by Mac Mestayer)

75

Stay Above Water with an Efficient Swimming Pool | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Above Water with an Efficient Swimming Pool Above Water with an Efficient Swimming Pool Stay Above Water with an Efficient Swimming Pool August 10, 2009 - 10:38am Addthis Allison Casey Senior Communicator, NREL All eyes were on the pool recently for swimming's 2009 World Championships in Rome. As a former competitive swimmer (though I was a dog-paddler compared to the likes of Michael Phelps and Ariana Kukors), these events hold a special place in my heart, and I managed to catch a few exciting moments in the competition. I'm no longer involved in the world of swimming, but I can only imagine that interest in the sport has skyrocketed since last year's thrilling Olympics in Beijing. Maybe you or your children were inspired to get serious about swimming; maybe you've even decided to install a pool at your

76

Relaxing a large cosmological constant  

E-Print Network [OSTI]

The cosmological constant (CC) problem is the biggest enigma of theoretical physics ever. In recent times, it has been rephrased as the dark energy problem in order to encompass a wider spectrum of possibilities. It is, in any case, a polyhedric puzzle with many faces, including the cosmic coincidence problem, i.e. why the density of matter is presently so close to the CC density. However, the oldest, toughest and most intriguing face of this polyhedron is the big CC problem, namely why the measured value of the CC at present is so small as compared to any typical density scale existing in high energy physics, especially taking into account the many phase transitions that our Universe has undergone since the early times, including inflation. In this letter, we propose to extend the field equations of General Relativity by including a class of invariant terms that automatically relax the value of the CC irrespective of the initial size of the vacuum energy in the early epochs. We show that, at late times, the Universe enters an eternal de Sitter stage mimicking a tiny positive cosmological constant. Thus, these models could solve the big CC problem and have also a bearing on the cosmic coincidence problem. Remarkably, they mimic the LCDM model to a large extent, but they still leave some characteristic imprints that should be testable in the next generation of experiments.

Florian Bauer; Joan Sola; Hrvoje Stefancic

2009-07-23T23:59:59.000Z

77

Coming to study in the Netherlands Do you want to study in the Netherlands? For a stay of over  

E-Print Network [OSTI]

Coming to study in the Netherlands #12;Do you want to study in the Netherlands? For a stay of over. There is a separate admissions procedure for work experience (working in the Netherlands as part of a course or job outside Europe). For further details see publication `Coming to work in the Netherlands'. 1. Why have we

van Suijlekom, Walter

78

Solar system tests of the cosmological constant  

E-Print Network [OSTI]

We discuss the influence of the cosmological constant $\\Lambda$ on the gravitational equations of motion of bodies with arbitrary masses and eventually solve the two-body problem. Observational constraints are derived from measurements of the periastron advance in stellar systems, in particular binary pulsars and the solar system. For the latter we consider also the change in the mean motion due to $\\Lambda$. Up to now, Earth and Mars data give the best constraint, $\\Lambda \\sim 10^{-36} \\mathrm{km}^{-2}$. If properly accounting for the gravito-magnetic effect, this upper limit on $\\Lambda$ could greatly improve in the near future thanks to new data from planned or already operating space-missions. Dark matter or modifications of the Newtonian inverse-square law in the solar system are discussed as well. Variations in the $1/r^2$ behavior are considered in the form of either a possible Yukawa-like interaction or a modification of gravity of MOND type.

Philippe Jetzer; Mauro Sereno

2007-11-23T23:59:59.000Z

79

Shape from Contour: Straight Homogeneous Generalized Cylinders and Constant Cross Section Generalized Cylinders  

Science Journals Connector (OSTI)

Abstract We analyze the properties of Straight Homogeneous Generalized Cylinders (SHGCs) and Constant Cross Section Generalized Cylinders (CGCs), and derive the types of symmetries that the limb boundaries and cross sections of these objects produce ... Keywords: Shape from contour, staright homogeneous generalized cones, constant cross section generalized cones, symmetry analysis, shape constraints.

Faith Ulupinar; Ramakant Nevatia

1995-02-01T23:59:59.000Z

80

Emergent cosmological constant from colliding electromagnetic waves  

E-Print Network [OSTI]

In this study we advocate the view that the cosmological constant is of electromagnetic (em) origin, which can be generated from the collision of em shock waves coupled with gravitational shock waves. The wave profiles that participate in the collision have different amplitudes. It is shown that, circular polarization with equal amplitude waves does not generate cosmological constant. We also prove that the generation of the cosmological constant is related to the linear polarization. The addition of cross polarization generates no cosmological constant. Depending on the value of the wave amplitudes, the generated cosmological constant can be positive or negative. We show additionally that, the collision of nonlinear em waves in a particular class of Born-Infeld theory also yields a cosmological constant.

M. Halilsoy; S. Habib Mazharimousavi; O. Gurtug

2014-10-15T23:59:59.000Z

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


81

Constant voltage electro-slag remelting control  

DOE Patents [OSTI]

A system for controlling electrode gap in an electro-slag remelt furnace has a constant regulated voltage and an electrode which is fed into the slag pool at a constant rate. The impedance of the circuit through the slag pool is directly proportional to the gap distance. Because of the constant voltage, the system current changes are inversely proportional to changes in gap. This negative feedback causes the gap to remain stable. 1 fig.

Schlienger, M.E.

1996-10-22T23:59:59.000Z

82

Cosmological Constant and Axions in String Theory  

SciTech Connect (OSTI)

String theory axions appear to be promising candidates for explaining cosmological constant via quintessence. In this paper, we study conditions on the string compactifications under which axion quintessence can happen. For sufficiently large number of axions, cosmological constant can be accounted for as the potential energy of axions that have not yet relaxed to their minima. In compactifications that incorporate unified models of particle physics, the height of the axion potential can naturally fall close to the observed value of cosmological constant.

Svrcek, Peter; /Stanford U., Phys. Dept. /SLAC

2006-08-18T23:59:59.000Z

83

Newtonian Constant of Gravitation International Consortium  

E-Print Network [OSTI]

Newtonian Constant of Gravitation International Consortium I. BACKGROUND Recent measurements of the Newtonian constant of gravitation G are in disagreement, with discrepancies that are roughly ten times forces on a laboratory scale. It also raises the question of whether the Newtonian force law

84

The Constant Radiance Term Lszl Neumann 1  

E-Print Network [OSTI]

is zero. The self- 1 Email: neumann@hungary.net #12; L. Neumann: The Constant Radiance Term - 2 information, nor the calculation of form factors. A constant radiance is extracted from the solution in every of the residuum problem is zero. The self-emitting term of the residuum problem can either be positive or negative

85

Inflation with a negative cosmological constant  

SciTech Connect (OSTI)

We find a unique way of realizing inflation through cyclic phases in a universe with negative vacuum energy. According to the second law of thermodynamics entropy monotonically increases from cycle to cycle, typically by a constant factor. This means that the scale factor at the same energy density in consecutive cycles also increases by a constant factor. If the time period of the oscillations remains approximately constant then this leads to an 'overall' exponential growth of the scale factor, mimicking inflation. A graceful exit from this inflationary phase is possible as a dynamical scalar field can take us from the negative to a positive energy vacuum during the last contracting phase.

Biswas, Tirthabir [Department of Physics, Institute for Gravitation and the Cosmos, Pennsylvania State University, 104 Davey Lab, University Park, Pennsylvania, 16802 (United States); Mazumdar, Anupam [Physics Department, Lancaster University, Lancaster, LA1 4YB (United Kingdom); Niels Bohr Institute, Copenhagen, Blegdamsvej-17, DK-2100 (Denmark)

2009-07-15T23:59:59.000Z

86

TASI Lectures on the cosmological constant  

E-Print Network [OSTI]

discovery in tones of wonder and stupefaction, as a mysterious dark energy,dark energy. 5.3 The real second problem By sharpening the cosmological constant problem, the discovery

Bousso, Raphael

2008-01-01T23:59:59.000Z

87

Optical constants of liquid and solid methane  

Science Journals Connector (OSTI)

The optical constants nr + ini of liquid methane and phase I solid methane were determined over the entire spectral range by the use of various data sources published in the...

Martonchik, John V; Orton, Glenn S

1994-01-01T23:59:59.000Z

88

Blood Types  

E-Print Network [OSTI]

Broadcast Transcript: According to the Japanese, you can tell a lot about a person by their blood type: Type A is the farmer, calm and responsible; Type B is the hunter, independent and creative; Type AB is humanistic, ...

Hacker, Randi; Tsutsui, William

2007-03-14T23:59:59.000Z

89

Asymptotic safety and the cosmological constant  

E-Print Network [OSTI]

We study the non-perturbative renormalisation of quantum gravity in four dimensions. Taking care to disentangle physical degrees of freedom, we observe the topological nature of conformal fluctuations arising from the functional measure. The resulting beta functions possess an asymptotically safe fixed point with a global phase structure leading to classical general relativity for positive, negative or vanishing cosmological constant. If only the conformal fluctuations are quantised we find an asymptotically safe fixed point predicting a vanishing cosmological constant on all scales. At this fixed point we reproduce the critical exponent, $\

Kevin Falls

2014-08-01T23:59:59.000Z

90

Black Hole Constraints on Varying Fundamental Constants  

SciTech Connect (OSTI)

We apply the generalized second law of thermodynamics and derive upper limits on the variation in the fundamental constants. The maximum variation in the electronic charge permitted for black holes accreting and emitting in the present cosmic microwave background corresponds to a variation in the fine-structure constant of {delta}{alpha}/{alpha}{approx_equal}2x10{sup -23} per second. This value matches the variation measured by Webb et al. [Phys. Rev. Lett. 82, 884 (1999); Phys. Rev. Lett. 87, 091301 (2001)] using absorption lines in the spectra of distant quasars and suggests the variation mechanism may be a coupling between the electron and the cosmic photon background.

MacGibbon, Jane H. [Department of Physics and Chemistry, University of North Florida, Jacksonville, Florida 32224 (United States)

2007-08-10T23:59:59.000Z

91

Electromagnetic corrections to pseudoscalar decay constants  

E-Print Network [OSTI]

The effects of electromagnetic interactions on pseudoscalar decay constants are investigated. Using a compact QED and QCD action we are able to resolve differences of about 0.1 MeV. We obtain the preliminary results f_pi^0-f_pi^+/- =0.09(3) MeV and f_D^0-f_D^+/- =0.79(11) MeV for light and charmed pseudoscalar decay constants on a N_f=2 nonperturbatively improved Sheikholeslami-Wohlert ensemble.

Benjamin Glaessle; Gunnar S. Bali

2011-11-16T23:59:59.000Z

92

Environmental Dependence of Masses and Coupling Constants  

E-Print Network [OSTI]

We construct a class of scalar field models coupled to matter that lead to the dependence of masses and coupling constants on the ambient matter density. Such models predict a deviation of couplings measured on the Earth from values determined in low-density astrophysical environments, but do not necessarily require the evolution of coupling constants with the redshift in the recent cosmological past. Additional laboratory and astrophysical tests of \\Delta \\alpha and \\Delta(m_p/m_e) as functions of the ambient matter density are warranted.

Keith A. Olive; Maxim Pospelov

2007-09-24T23:59:59.000Z

93

Transportation Demand This  

Gasoline and Diesel Fuel Update (EIA)

(VMT) per vehicle by fleet type stays constant over the forecast period based on the Oak Ridge National Laboratory fleet data. Fleet fuel economy for both conventional and...

94

Low-Cost Constant Temperature Heating Block  

Science Journals Connector (OSTI)

Low-Cost Constant Temperature Heating Block ... Secondary school and undergraduate laboratories can build many units for the cost of a commercially comparable one while simultaneously putting to practice several electronic principles taught in most instrumental analysis courses. ... Cost-Effective Teacher ...

Charles G. Shevlin; Ward Coppersmith; Christopher Fish; Stanley Vlock; William Vellema

1997-08-01T23:59:59.000Z

95

Surface Tension and the Cosmological Constant  

E-Print Network [OSTI]

The astronomically observed value of the cosmological constant is small but non-zero. This raises two questions together known as the cosmological constant problem a) why is lambda so nearly zero? b) why is lambda not EXACTLY zero? Sorkin has proposed that b) can be naturally explained as a one by square root N fluctuation by invoking discreteness of spacetime at the Planck scale due to quantum gravity. In this paper we shed light on these questions by developing an analogy between the cosmological constant and the surface tension of membranes. The ``cosmological constant problem'' has a natural analogue in the membrane context: the vanishingly small surface tension of fluid membranes provides an example where question a) above arises and is answered. We go on to find a direct analogue of Sorkin's proposal for answering question b) in the membrane context, where the discreteness of spacetime translates into the molecular structure of matter. We propose analogue experiments to probe a small and fluctuating surface tension in fluid membranes. A counterpart of dimensional reduction a la Kaluza-Klein and large extra dimensions also appears in the physics of fluid membranes.

Joseph Samuel; Supurna Sinha

2006-04-18T23:59:59.000Z

96

Density Perturbations for Running Cosmological Constant  

E-Print Network [OSTI]

The dynamics of density and metric perturbations is investigated for the previously developed model where the decay of the vacuum energy into matter (or vice versa) is due to the renormalization group (RG) running of the cosmological constant (CC) term. The evolution of the CC depends on the single parameter \

Julio C. Fabris; Ilya L. Shapiro; Joan Sola

2007-01-26T23:59:59.000Z

97

A Time-dependent Cosmological Constant Phenomenology  

E-Print Network [OSTI]

We construct a cosmological toy model in which a step-function ``cosmological constant'' is taken into consideration beside ordinary matter. We assume that $\\Lambda$ takes two values depending on the epoch, and matter goes from a radiation dominated era to a dust dominated era. The model is exactly solvable and it can be compared with recent observations.

Salvatore Capozziello; Ruggiero de Ritis; Alma Angela Marino

1996-05-29T23:59:59.000Z

98

The Cosmological Constant and the String Landscape  

E-Print Network [OSTI]

Theories of the cosmological constant fall into two classes, those in which the vacuum energy is fixed by the fundamental theory and those in which it is adjustable in some way. For each class we discuss key challenges. The string theory landscape is an example of an adjustment mechanism. We discuss the status of this idea, and future directions.

Joseph Polchinski

2006-04-21T23:59:59.000Z

99

Infrared Spectroscopy and Optical Constants of Porous Amorphous...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Spectroscopy and Optical Constants of Porous Amorphous Solid Water. Infrared Spectroscopy and Optical Constants of Porous Amorphous Solid Water. Abstract: Reflection-absorption...

100

Quantum Exclusion of Positive Cosmological Constant?  

E-Print Network [OSTI]

We show that a positive cosmological constant is incompatible with the quantum-corpuscular resolution of de Sitter metric in form of a coherent state. The reason is very general and is due to the quantum self-destruction of the coherent state because of the scattering of constituent graviton quanta. This process creates an irreversible quantum clock, which precludes eternal de Sitter. It also eliminates the possibility of Boltzmann brains and Poincare recurrences. This effect is expected to be part of any microscopic theory that takes into account the quantum corpuscular structure of the cosmological background. This observation puts the cosmological constant problem in a very different light, promoting it, from a naturalness problem, into a question of quantum consistency. We are learning that quantum gravity cannot tolerate exceedingly-classical sources.

Gia Dvali; Cesar Gomez

2014-12-27T23:59:59.000Z

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


101

Cosmological Constant Problems and Renormalization Group  

E-Print Network [OSTI]

The Cosmological Constant Problem emerges when Quantum Field Theory is applied to the gravitational theory, due to the enormous magnitude of the induced energy of the vacuum. The unique known solution of this problem involves an extremely precise fine-tuning of the vacuum counterpart. We review a few of the existing approaches to this problem based on the account of the quantum (loop) effects and pay special attention to the ones involving the renormalization group.

Ilya L. Shapiro; Joan Sola

2007-01-05T23:59:59.000Z

102

A comparison of various calculational methods for constant volatility ratio, constant reflux multicomponent distillation  

E-Print Network [OSTI]

for Figures 17, 18, nd 19. . . 83 XIV. Tabulation of Empirical Correlation (Equation 48). 85 ZIQUR S Page l. Operating Data for the Depropanization of a Light Naphtha. 26 2. Composition of Vapor Rising from Plates in a Column Containi. ng an Infinite... for lg constant- doublet separation systems in which the molal liquid and vapor flows remain constant within each section of the column. An empirical correlation (Equation 48) relating the error of the "apcroximate" method to process variables...

Hurst, James William

1952-01-01T23:59:59.000Z

103

RUTGERS MOBILE APP Stay connected with the Rutgers mobile application, available for the iPhone, iPad, iPod, as well  

E-Print Network [OSTI]

- 1 - RUTGERS MOBILE APP Stay connected with the Rutgers mobile application, available for the i Rutgers mobile web sites that work great whether you're on cellular or RUWireless. News: Up, and more. How to request this service: The Rutgers Mobile App can be downloaded at the App

Hanson, Stephen José

104

`Green Christmas' Advice There are lots of ways to stay 'green' over the festive period so let's not make our buildings work hard  

E-Print Network [OSTI]

`Green Christmas' Advice There are lots of ways to stay 'green' over the festive period so let sure you switch off any appliances which can be switched off (i.e. non-essential) over the Christmas for consumption) Make sure all non-essential lights are switched off when the last person leaves for the holidays

Wirosoetisno, Djoko

105

`Green Christmas' Advice There are lots of ways to stay 'green' over the festive period so let's not make our buildings work hard  

E-Print Network [OSTI]

`Green Christmas' Advice There are lots of ways to stay 'green' over the festive period so let sure you switch off any appliances which can be switched off (i.e. non-essential) over the Christmas-essential lights are switched off when the last person leaves for the holidays. This includes office lights / desk

Wirosoetisno, Djoko

106

34 Chemical Shifts and Coupling Constants for CHP  

Science Journals Connector (OSTI)

It contains 31P NMR data (chemical shift, coupling constant), structural diagram, and solvent of CHP

M. Kumar

2013-01-01T23:59:59.000Z

107

Alternative to the principle of constant speed of light  

E-Print Network [OSTI]

To consider a medium carrying light and electromagnetic waves is impossible, when this medium shall have properties according to the principle of constant speed of light, that is, isotropy of speed of light in every system of reference. Therefore, with principle of constant speed of light abandoned, the so-called medium synchronization of clocks is defined, yielding isotropy solely in the system at rest and anisotropy in all moving systems. From medium synchronization the appropriate coordinate transformation is developed, the so-called medium transformation, a Galilean type of transformation, thus maintaining simultaneity between all participant systems of reference and changing the form of Maxwells equations to the extended Maxwell equations. Despite the fact that medium transformation violates Lorentz invariance and the principle of relativity, it is demonstrated that the results from medium transformation and extended Maxwell equations are fully compliant with observable phenomena. Moreover, it is shown that the concept of a medium, a preferred frame of reference, is compatible not only with medium transformation, but also with Lorentz transformation and with theory of special relativity, so it is quite possible now to consider a realistic medium. Finally, a discrepancy is exposed within theory of special relativity, giving rise to assume a preferred frame of reference even in special relativity.

Herbert Weiss

2006-06-28T23:59:59.000Z

108

Scalar field collapse with negative cosmological constant  

E-Print Network [OSTI]

The formation of black holes or naked singularities is studied in a model in which a homogeneous time-dependent scalar field with an exponential potential couples to four dimensional gravity with negative cosmological constant. An analytic solution is derived and its consequences are discussed. The model depends only on one free parameter, which determines the equation of state and decides the fate of the spacetime. Without fine tuning the value of this parameter the collapse ends in a generic formation of a black hole or a naked singularity. The latter case violates the cosmic censorship conjecture.

R. Baier; Hiromichi Nishimura; S. A. Stricker

2014-10-13T23:59:59.000Z

109

Scalar field collapse with negative cosmological constant  

E-Print Network [OSTI]

The formation of black holes or naked singularities is studied in a model in which a homogeneous time-dependent scalar field with an exponential potential couples to four dimensional gravity with negative cosmological constant. An analytic solution is derived and its consequences are discussed. The model depends only on one free parameter which determines the equation of state and decides the fate of the spacetime. Depending on the value of this parameter the collapse ends in a black hole or a naked singularity. The latter case violates the cosmic censorship conjecture.

Baier, R; Stricker, S A

2014-01-01T23:59:59.000Z

110

Cosmological Constant and the Speed of Light  

E-Print Network [OSTI]

By exploring the relationship between the propagation of electromagnetic waves in a gravitational field and the light propagation in a refractive medium, it is shown that, in the presence of a positive cosmological constant, the velocity of light will be smaller than its special relativity value. Then, restricting again to the domain of validity of geometrical optics, the same result is obtained in the context of wave optics. It is argued that this phenomenon and the anisotropy in the velocity of light in a gravitational field are produced by the same mechanism.

W. R. Esposito Miguel; J. G. Pereira

2000-06-28T23:59:59.000Z

111

Seismic pulse propagation with constant Q and stable probability distributions  

E-Print Network [OSTI]

The one-dimensional propagation of seismic waves with constant Q is shown to be governed by an evolution equation of fractional order in time, which interpolates the heat equation and the wave equation. The fundamental solutions for the Cauchy and Signalling problems are expressed in terms of entire functions (of Wright type) in the similarity variable and their behaviours turn out to be intermediate between those for the limiting cases of a perfectly viscous fluid and a perfectly elastic solid. In view of the small dissipation exhibited by the seismic pulses, the nearly elastic limit is considered. Furthermore, the fundamental solutions for the Cauchy and Signalling problems are shown to be related to stable probability distributions with index of stability determined by the order of the fractional time derivative in the evolution equation.

Francesco Mainardi; Massimo Tomirotti

2010-08-07T23:59:59.000Z

112

* Please reference as: Forder, J and Fernandez, J-L (2011) Length of stay in care homes, Report commissioned by Bupa Care Services, PSSRU Discussion Paper 2769, Canterbury: PSSRU  

E-Print Network [OSTI]

* Please reference as: Forder, J and Fernandez, J-L (2011) Length of stay in care homes, Report commissioned by Bupa Care Services, PSSRU Discussion Paper 2769, Canterbury: PSSRU Length of stay in care homes...........................................................................................................................................................................28 #12;3 Executive summary Care home placements constitute the majority (57%) of net council spending

113

STAYS PNNL SUITE  

Energy Science and Technology Software Center (OSTI)

002851IBMPC00 STAYSL PNNL Suite http://radiochemscieng.pnnl.gov/research_areas/research_area_description.asp?id=283

114

Type Fusion  

Science Journals Connector (OSTI)

Fusion is an indispensable tool in the arsenal ... Less well-known, but equally valuable is type fusion, which states conditions for fusing an application ... algebra. We provide a novel proof of type fusion base...

Ralf Hinze

2011-01-01T23:59:59.000Z

115

Casimir energy for surfaces with constant conductivity  

E-Print Network [OSTI]

We consider the vacuum energy of the electromagnetic field in systems characterized by a constant conductivity using the zeta-regularization approach. The interaction in two cases is investigated: two infinitely thin parallel sheets and an infinitely thin spherical shell. We found that the Casimir energy for the planar system is always attractive and it has the same characteristic distance dependence as the interaction for two perfect semi-infinite metals. The Casimir energy for the spherical shell depends on the inverse radius of the sphere, but it maybe negative or positive depending on the value of the conductivity. If the conductivity is less than a certain critical value, the interaction is attractive, otherwise the Casimir force is repulsive regardless of the spherical shell radius.

Nail Khusnutdinov; D. Drosdoff; Lilia M. Woods

2014-04-09T23:59:59.000Z

116

Eternal Higgs inflation and cosmological constant problem  

E-Print Network [OSTI]

We investigate the Higgs potential beyond the Planck scale in the superstring theory, under the assumption that the supersymmetry is broken at the string scale. We identify the Higgs field as a massless state of the string, which is indicated by the fact that the bare Higgs mass can be zero around the string scale. We find that, in the large field region, the Higgs potential is connected to a runaway vacuum with vanishing energy, which corresponds to opening up an extra dimension. We verify that such universal behavior indeed follows from the toroidal compactification of the non-supersymmetric $SO(16)\\times SO(16)$ heterotic string theory. We show that this behavior fits in the picture that the Higgs field is the source of the eternal inflation. The observed small value of the cosmological constant of our universe may be understood as the degeneracy with this runaway vacuum, which has vanishing energy, as is suggested by the multiple point criticality principle.

Hamada, Yuta; Oda, Kin-ya

2015-01-01T23:59:59.000Z

117

Universal equations and constants of turbulent motion  

E-Print Network [OSTI]

This paper presents a parameter-free theory of shear-generated turbulence at asymptotically high Reynolds numbers in incompressible fluids. It is based on a two-fluids concept. Both components are materially identical and inviscid. The first component is an ensemble of quasi-rigid dipole-vortex tubes as quasi-particles in chaotic motion. The second is a superfluid performing evasive motions between the tubes. The local dipole motions follow Helmholtz' law. The vortex radii scale with the energy-containing length scale. Collisions between quasi-particles lead either to annihilation (likewise rotation, turbulent dissipation) or to scattering (counterrotation, turbulent diffusion). There are analogies with birth and death processes of population dynamics and their master equations. For free homogeneous decay the theory predicts the TKE to follow 1/t. With an adiabatic condition at the wall it predicts the logarithmic law with von Karman's constant as 1/\\sqrt{2 pi} = 0.399. Likewise rotating couples form dissipat...

Baumert, Helmut Z

2012-01-01T23:59:59.000Z

118

Dielectric Constant and Transport Mechanism of Percolated Polyaniline Nanoclay Composites.  

Science Journals Connector (OSTI)

Dielectric Constant and Transport Mechanism of Percolated Polyaniline Nanoclay Composites. ... We report the dielectric constant and transport mechanism of intercalated nanoclaypolyaniline composite, an industrially ready to use novel nanocomposite, which is prepared by a simple mechanochemical method. ...

Mini Vellakkat; Archana Kamath; S. Raghu; Sharanappa Chapi; Devendrappa Hundekal

2014-09-30T23:59:59.000Z

119

Supply Fan Control for Constant Air Volume Air Handling Units  

E-Print Network [OSTI]

Since terminal boxes do not have a modulation damper in constant volume (CV) air handling unit (AHU) systems, zone reheat coils have to be modulated to maintain the space temperature with constant supply airflow. This conventional control sequence...

Cho, Y.; Wang, G.; Liu, M.

2007-01-01T23:59:59.000Z

120

The determination of best values of the fundamental physical constants  

Science Journals Connector (OSTI)

...Discussion Meeting Issue The fundamental constants of physics, precision...calls to mind an axiom of the fundamental constants field, namely...uncertainties.) Although it does not ensure that an unsuspected...uncertainty of interest in the fundamental constants field at that time...

2005-01-01T23:59:59.000Z

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


121

Holographic Dark Energy with Cosmological Constant  

E-Print Network [OSTI]

Inspired by the multiverse scenario, we study a heterotic dark energy model in which there are two parts, the first being the cosmological constant and the second being the holographic dark energy, thus this model is named the $\\Lambda$HDE model. By studying the $\\Lambda$HDE model theoretically, we find that the parameters $c$ and $\\Omega_{hde}$ are divided into a few domains in which the fate of the universe is quite different. We investigate dynamical behaviors of this model, and especially the future evolution of the universe. We perform fitting analysis on the cosmological parameters in the $\\Lambda$HDE model by using the recent observational data. We find the model yields $\\chi^2_{\\rm min}=426.27$ when constrained by Planck+SNLS3+BAO+HST, comparable to the results of the HDE model (428.20) and the concordant $\\Lambda$CDM model (431.35). At 68.3\\% CL, we obtain $-0.07<\\Omega_{\\Lambda0}<0.68$ and correspondingly $0.04<\\Omega_{hde0}<0.79$, implying at present there is considerable degeneracy bet...

Hu, Yazhou; Li, Nan; Zhang, Zhenhui

2015-01-01T23:59:59.000Z

122

Universal equations and constants of turbulent motion  

E-Print Network [OSTI]

This paper presents a parameter-free theory of shear-generated turbulence at asymptotically high Reynolds numbers in incompressible fluids. It is based on a two-fluids concept. Both components are materially identical and inviscid. The first component is an ensemble of quasi-rigid dipole-vortex tubes as quasi-particles in chaotic motion. The second is a superfluid performing evasive motions between the tubes. The local dipole motions follow Helmholtz' law. The vortex radii scale with the energy-containing length scale. Collisions between quasi-particles lead either to annihilation (likewise rotation, turbulent dissipation) or to scattering (counterrotation, turbulent diffusion). There are analogies with birth and death processes of population dynamics and their master equations. For free homogeneous decay the theory predicts the TKE to follow 1/t. With an adiabatic condition at the wall it predicts the logarithmic law with von Karman's constant as 1/\\sqrt{2 pi} = 0.399. Likewise rotating couples form dissipative patches almost at rest ($\\rightarrow$ intermittency) wherein the spectrum evolves like an "Apollonian gear" as discussed first by Herrmann, 1990. On this basis the prefactor of the 3D-wavenumber spectrum is predicted as (1/3)(4 pi)^{2/3}=1.8; in the Lagrangian frequency spectrum it is simply 2. The results are situated well within the scatter range of observational, experimental and DNS results.

Helmut Z. Baumert

2012-03-22T23:59:59.000Z

123

Universal constants and equations of turbulent motion  

E-Print Network [OSTI]

In the spirit of Prandtl [1926], for turbulence at high Reynolds number we present an analogy with the kinetic theory of gases, with dipoles made of Thorpe's [1977] quasi-solid vortex tubes as frictionless, incompressible but deformable quasi-particles. Their movements are governed by Helmholtz' elementary vortex rules applied locally. A contact interaction or 'collision' leads either to random scatter of a trajectory or to the formation of two likewise rotating, fundamentally unstable whirls forming a dissipative patch slowly rotating around its center of mass which is almost at rest. This approach predicts von Karman's constant as 1/sqrt(2 pi) = 0.399 and the spatio-temporal dynamics of energy-containing time and length scales controlling turbulent mixing Baumert [2009]. A link to turbulence spectra was missing so far. In the present paper it is shown that the above image of random vortex-dipole movements is compatible with Kolmogorov's turbulence spectra if dissipative patches, beginning as two likewise ro...

Baumert, Helmut Z

2011-01-01T23:59:59.000Z

124

Determination of the Hubble Constant Using Cepheids  

E-Print Network [OSTI]

This paper introduces a statistical treatment to use Cepheid variable stars as distance indicators. The expansion rate of the Universe is also studied here through deriving the value of the Hubble constant H0. A Gaussian function approximation is proposed to fit the absolute magnitude and period of Cepheid variables in our galaxy. The calculations are carried out on samples of Cepheids observed in 23 galaxies to derive the distance modulus (DM) of these galaxies based on the frequency distributions of their periods and intrinsic apparent magnitudes. The DM is the difference between the apparent magnitude for extragalactic Cepheids and the absolute magnitude of the galactic Cepheids at maximum number. It is calculated by using the comparison of the period distribution of Cepheids in our galaxy and in other galaxies. This method is preferred due to its simplicity to use and its efficiency in providing reliable DM. A linear fit with correlation coefficient of 99.68% has been found between the published distance ...

Abdel-Sabour, Mohamed; Issa, Issa Ali; El-Nawawy, Mohamed Saleh; Kordi, Ayman; Almostafa, Zaki; El-Said, Ahmad Essam; Ali, Gamal Bakr

2014-01-01T23:59:59.000Z

125

Variation of stability constants of thorium citrate complexes and of thorium hydrolysis constants with ionic strength  

SciTech Connect (OSTI)

Citrate is among the organic anions that are expected to be present in the wastes planned for deposition in the Waste Isolation Pilot Plant repository. In this study, a solvent extraction method has been used to measure the stability constants of Thorium(IV)[Th(IV)] with citrate anions in aqueous solutions with (a) NaClO{sub 4} and (b) NaCl as the background electrolytes. The ionic strengths were varied up to 5 m (NaCl) and 14 m (NaClO{sub 4}). The data from the NaClO{sub 4} solutions at varying pH values were used to calculate the hydrolysis constants for formation of Th(OH){sup 3+} at the different ionic strengths.

Choppin, G.R.; Erten, H.N.; Xia, Y.X. [Florida State Univ., Tallahassee, FL (United States)

1995-09-01T23:59:59.000Z

126

The variation of the fine structure constant: testing the dipole model with thermonuclear supernovae  

E-Print Network [OSTI]

The large-number hypothesis conjectures that fundamental constants may vary. Accordingly, the spacetime variation of fundamental constants has been an active subject of research for decades. Recently, using data obtained with large telescopes a phenomenological model in which the fine structure constant might vary spatially has been proposed. We test whether this hypothetical spatial variation of {\\alpha}, which follows a dipole law, is compatible with the data of distant thermonuclear supernovae. Unlike previous works, in our calculations we consider not only the variation of the luminosity distance when a varying {\\alpha} is adopted, but we also take into account the variation of the peak luminosity of Type Ia supernovae resulting from a variation of {\\alpha}. This is done using an empirical relation for the peak bolometric magnitude of thermonuclear supernovae that correctly reproduces the results of detailed numerical simulations. We find that there is no significant difference between the several phenome...

Kraiselburd, Lucila; Negrelli, Carolina; Berro, Enrique Garca

2014-01-01T23:59:59.000Z

127

Elastic constants of single crystal Hastelloy X at elevated temperatures  

SciTech Connect (OSTI)

An acoustic time of flight technique is described in detail for measuring the elastic constants of cubic single crystals that allows for the constants to be determined at elevated temperature. Although the overall technique is not new, various aspects of the present work may prove extremely useful to others interested in finding these values, especially for aerospace materials applications. Elastic constants were determined for the nickel based alloy, Hastelloy X from room temperature to 1,000 C. Accurate elastic constants were needed as part of an effort to predict both polycrystal mechanical properties and the nature of grain induced heterogeneous mechanical response. The increased accuracy of the acoustically determined constants resulted in up to a 15% change in the predicted stresses in individual grains. These results indicate that the use of elastic single crystal constants of pure nickel as an approximation for the constants of gas turbine single crystal alloys, which is often done today, is inaccurate.

Canistraro, H.A. [Univ. of Hartford, CT (United States). Dept. of Mechanical and Audio Engineering Technology; Jordan, E.H.; Shi Shixiang [Univ. of Connecticut, Storrs, CT (United States); Favrow, L.H.; Reed, F.A. [United Technologies Research Center, East Hartford, CT (United States)

1998-07-01T23:59:59.000Z

128

Universal constants and equations of turbulent motion  

E-Print Network [OSTI]

In the spirit of Prandtl's conjecture of 1926, for turbulence at high Reynolds number we present an analogy with the kinetic theory of gases, with dipoles made of quasi-rigid and 'dressed' vortex tubes as frictionless, incompressible but deformable quasi-particles. Their movements are governed by Helmholtz' elementary vortex rules applied locally. A contact interaction or 'collision' leads either to random scatter of a trajectory or to the formation of two likewise rotating, fundamentally unstable whirls forming a dissipative patch slowly rotating around its center of mass which is almost at rest. This approach predicts von Karman's constant as 1/sqrt(2 pi) = 0.399 and the spatio-temporal dynamics of energy-containing time and length scales controlling turbulent mixing [Baumert 2009]. A link to turbulence spectra was missing so far. In the present paper it is shown that the above image of random vortex-dipole movements is compatible with Kolmogorov's turbulence spectra if dissipative patches, beginning as two likewise rotating eddies, evolve locally into a space-filling bearing in the sense of Herrmann [1990], i.e. into an "Apollonian gear". Its parts and pieces are incompressible and flexibly deformable vortex tubes which are frictionless, excepting the dissipative scale of size zero. For steady and locally homogeneous conditions our approach predicts the dimensionless pre-factor in the 3D Eulerian wavenumber spectrum as [(4 pi)^2/3]/3 = 1.8, and in the Lagrangian frequency spectrum as 2. Our derivations rest on geometry, methods from many-particle physics, and on elementary conservation laws.

Helmut Z. Baumert

2011-07-25T23:59:59.000Z

129

Melanin Types  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Melanin Types Melanin Types Name: Irfan Location: N/A Country: N/A Date: N/A Question: What are different types of melanins? And what are the functions of these types? Replies: Hi Irfan! Melanin is a dark compound or better a photoprotective pigment. Its major role in the skin is to absorb the ultraviolet (UV) light that comes from the sun so the skin is not damaged. Sun exposure usually produces a tan at the skin that represents an increase of melanin pigment in the skin. Melanin is important also in other areas of the body, as the eye and the brain., but it is not completely understood what the melanin pigment does in these areas. Melanin forms a special cell called melanocyte. This cell is found in the skin, in the hair follicle, and in the iris and retina of the eye.

130

The Analysis of Hydrocarbon Distillates for Group Types Using HPLC With Dielectric Constant Detection: A Review  

Science Journals Connector (OSTI)

......David Talbot Day, chief of the Division of Mineral Resources of the American Geological Survey...the color and composition of Pennsylvania green petroleum after percolation through a column of powdered lime stone. In August of 1900, Day reported......

Paul C. Hayes; Jr.; Steven D. Anderson

1988-05-01T23:59:59.000Z

131

ON THE WEAK-TYPE CONSTANT OF THE BEURLING-AHLFORS ...  

E-Print Network [OSTI]

tion of G, the two unimodular terms cancel out and the integral value does ...... B. Johnson and Joram Lindenstrauss, eds., Handbook of the Geometry of Banach.

2008-08-22T23:59:59.000Z

132

The Constant Rank Condition and Second Order Constraint ...  

E-Print Network [OSTI]

Nov 13, 2009 ... The Constant Rank condition for feasible points of nonlinear ... stant Rank condition is, in addition, a second order constraint qualification.

2009-11-13T23:59:59.000Z

133

Codes of constant Lee or Euclidean weight Jay A. Wood  

E-Print Network [OSTI]

Codes of constant Lee or Euclidean weight Jay A. Wood Department of Mathematics, Computer Science & Statistics Purdue University Calumet Hammond, Indiana 46323 2094 USA wood@calumet.purdue.edu http: www.calumet.purdue.edu public math wood Abstract. Carlet 2 has determined the linear codes over Z=4 of constant Lee weight

Wood, Jay

134

The Duffing Oscillator And Linearization Techniques For Its Motion Constants  

E-Print Network [OSTI]

constant is known, solving the system is no longer needed to analyze the characteristics of the system. Motion constants are time independent integrals that are hard to find for nonlinear dynamic systems. We chose the Duffing Oscillator as a higher order...

Rashdan, Mouath

2014-01-16T23:59:59.000Z

135

Maximum Constant Boost Control of the Z-Source Inverter  

E-Print Network [OSTI]

Maximum Constant Boost Control of the Z-Source Inverter Miaosen Shen1 , Jin Wang1 , Alan Joseph1 Laboratory Abstract: This paper proposes two maximum constant boost control methods for the Z-source inverter to modulation index is analyzed in detail and verified by simulation and experiment. Keywords- Z-source inverter

Tolbert, Leon M.

136

|Archives| Charts| Companies/Links| Conferences| How A Fuel Cell Works | Patents| | Types of Fuel Cells | The Basics | Fuel Cell News | Basics on Hydrogen | Search|  

E-Print Network [OSTI]

Cells | The Basics | Fuel Cell News | Basics on Hydrogen | Search| *Stay Updated every week With a Free|Archives| Charts| Companies/Links| Conferences| How A Fuel Cell Works | Patents| | Types of Fuel Subscription To "Inside The Industry"As Well as a Weekly Updated Patents Page Gulliver's fuel cell travels

Lovley, Derek

137

|Archives| Charts| Companies/Links| Conferences| How A Fuel Cell Works | Patents| | Types of Fuel Cells | The Basics | Fuel Cell News | Basics on Hydrogen | Search|  

E-Print Network [OSTI]

Cells | The Basics | Fuel Cell News | Basics on Hydrogen | Search| *Stay Updated every week With a Free|Archives| Charts| Companies/Links| Conferences| How A Fuel Cell Works | Patents| | Types of Fuel Subscription To "Inside The Industry"As Well as a Weekly Updated Patents Page Fuel cell power Publication Date

Lovley, Derek

138

Advances in theoretical and physical aspects of spin-spin coupling constants  

Science Journals Connector (OSTI)

Publisher Summary This chapter describes trends of coupling constants on the basis of the concepts commonly used by chemists in the laboratory. With the discovery of nuclear magnetic resonance, four impressive progresses have taken place, both in experimental techniques and in theoretical approaches aimed at understanding the electronic origin of high-resolution nuclear magnetic resonance parameters. The chapter describes the calculation and analysis of spinspin coupling constants. Intra- and inter-molecular interaction effects on spinspin coupling constants have also been presented. Ab initio calculations of couplings in small molecules with large basis sets and inclusion of electron correlation effects have reached almost quantitative accuracy. Different types of couplings in different molecular environments have very different computational demands to obtain such accuracy. The use density functional theory (DFT)-based methods for chemical applications have increased exponentially in the past decade and the finite perturbation theory (FPT) approach to calculating the Fermi contact (FC) contribution to different couplings employing a variety of functionals has produced quite promising results. Progress in different experimental techniques helped determine relative signs of coupling constants, which in many cases are now determined routinely. This additional information is a significant improvement in using experimental values to obtain insights into different aspects of molecular electronic structure.

Rubn H. Contreras; Juan E. Peralta; Claudia G. Giribet; Martn C. Ruiz de aza; Julio C. Facelli

2000-01-01T23:59:59.000Z

139

Methodology for extracting local constants from petroleum cracking flows  

DOE Patents [OSTI]

A methodology provides for the extraction of local chemical kinetic model constants for use in a reacting flow computational fluid dynamics (CFD) computer code with chemical kinetic computations to optimize the operating conditions or design of the system, including retrofit design improvements to existing systems. The coupled CFD and kinetic computer code are used in combination with data obtained from a matrix of experimental tests to extract the kinetic constants. Local fluid dynamic effects are implicitly included in the extracted local kinetic constants for each particular application system to which the methodology is applied. The extracted local kinetic model constants work well over a fairly broad range of operating conditions for specific and complex reaction sets in specific and complex reactor systems. While disclosed in terms of use in a Fluid Catalytic Cracking (FCC) riser, the inventive methodology has application in virtually any reaction set to extract constants for any particular application and reaction set formulation. The methodology includes the step of: (1) selecting the test data sets for various conditions; (2) establishing the general trend of the parametric effect on the measured product yields; (3) calculating product yields for the selected test conditions using coupled computational fluid dynamics and chemical kinetics; (4) adjusting the local kinetic constants to match calculated product yields with experimental data; and (5) validating the determined set of local kinetic constants by comparing the calculated results with experimental data from additional test runs at different operating conditions.

Chang, Shen-Lin (Woodridge, IL); Lottes, Steven A. (Naperville, IL); Zhou, Chenn Q. (Munster, IN)

2000-01-01T23:59:59.000Z

140

Type: Renewal  

Broader source: Energy.gov (indexed) [DOE]

1 INCITE Awards 1 INCITE Awards Type: Renewal Title: -Ab Initio Dynamical Simulations for the Prediction of Bulk Properties‖ Principal Investigator: Theresa Windus, Iowa State University Co-Investigators: Brett Bode, Iowa State University Graham Fletcher, Argonne National Laboratory Mark Gordon, Iowa State University Monica Lamm, Iowa State University Michael Schmidt, Iowa State University Scientific Discipline: Chemistry: Physical INCITE Allocation: 10,000,000 processor hours Site: Argonne National Laboratory Machine (Allocation): IBM Blue Gene/P (10,000,000 processor hours) Research Summary: This project uses high-quality electronic structure theory, statistical mechanical methods, and

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While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

Open Inflation, the Four Form and the Cosmological Constant  

E-Print Network [OSTI]

Fundamental theories of quantum gravity such as supergravity include a four form field strength which contributes to the cosmological constant. The inclusion of such a field into our theory of open inflation (hep-th/9802030) allows an anthropic solution to the cosmological constant problem in which the cosmological constant gives a small but non-negligible contribution to the density of today's universe. We include a discussion of the role of the singularity in our solution and a reply to Vilenkin's recent criticism (hep-th/9803084).

Neil Turok; S. W. Hawking

1998-03-19T23:59:59.000Z

142

Bacteria Types  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Bacteria Types Bacteria Types Name: Evelyn Location: N/A Country: N/A Date: N/A Question: What is the significance of S. marcescens,M.luteus, S.epidermidis, and E. Coli? Which of these are gram-positive and gram-negative, and where can these be found? Also, what problems can they cause? When we culture these bacteria, we used four methods: plates, broth, slants, and pour plates. The media was made of TSB, TSA, NAP, and NAD. What is significant about these culturing methods? Replies: I could give you the answer to that question but it is more informative, and fun, to find out yourself. Start with the NCBI library online (http://www.ncbi.nlm.nih.gov/) and do a query with the species name, and 'virulence' if you want to know what they're doing to us. Have a look at the taxonomy devision to see how they are related. To find out if they're gram-pos or neg you should do a gram stain if you can. Otherwise you'll find that information in any bacteriology determination guide. Your question about the media is not specific enough so I can't answer it.

143

High Temperature, Large Sample Volume, Constant Flow Magic Angle Spinning NMR Probe for a 11  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

High Temperature, Large Sample Volume, Constant Flow Magic Angle Spinning NMR Probe for a High Temperature, Large Sample Volume, Constant Flow Magic Angle Spinning NMR Probe for a 11.7 T Magnetic Field for In Situ Catalytic Reaction Characterization Project start date: April 1, 2007 EMSL Lead Investigator: Joseph Ford, EMSL High Field Magnetic Resonance Facility Co-investigators: Jian Zhi Hu, Macromolecular Structure and Dynamics, Biological Science Division, FCSD Jesse Sears and David W. Hoyt, EMSL High Field Magnetic Resonance Facility Detailed understanding of the mechanisms involved in a catalytic reaction requires identification of the nature of the active sites and the temporal evolution of reaction intermediates. Although optical methods such as UV-visible and infrared (IR) spectroscopies can be used for some types of reactions, these do not

144

Facility Type!  

Office of Legacy Management (LM)

ITY: ITY: --&L~ ----------- srct-r~ -----------~------~------- if yee, date contacted ------------- cl Facility Type! i I 0 Theoretical Studies Cl Sample 84 Analysis ] Production 1 Diepasal/Storage 'YPE OF CONTRACT .--------------- 1 Prime J Subcontract&- 1 Purchase Order rl i '1 ! Other information (i.e., ---------~---~--~-------- :ontrait/Pirchaee Order # , I C -qXlJ- --~-------~~-------~~~~~~ I I ~~~---~~~~~~~T~~~ FONTRACTING PERIODi IWNERSHIP: ,I 1 AECIMED AECMED GOVT GOUT &NTtiAC+OR GUN-I OWNED ----- LEEE!? M!s LE!Ps2 -LdJG?- ---L .ANDS ILJILDINGS X2UIPilENT IRE OR RAW HA-I-L :INAL PRODUCT IASTE Z. RESIDUE I I kility l pt I ,-- 7- ,+- &!d,, ' IN&"E~:EW AT SITE -' ---------------- , . Control 0 AEC/tlED managed operations

145

Giant Dielectric Constant Controlled by Maxwell-Wagner Dielectric  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Giant Dielectric Constant Controlled Giant Dielectric Constant Controlled by Maxwell-Wagner Dielectric Relaxation in Al2O3/TiO2 Nanolaminates Synthesized by Atomic Layer Deposition Giant Dielectric Constant Controlled by Maxwell-Wagner Dielectric Relaxation in Al2O3/TiO2 Nanolaminates Synthesized by Atomic Layer Deposition Nanolaminate consisting of Al2O3 and TiO2 oxide sublayers were synthesized, using atomic layer deposition (ALD) to produce individual layers with atomic scale control. The main goal of this work is to produce robust high dielectric constant layers based on biocompatible materials, such as Al2O3 and TiO2, suitable to fabricate high-capacitance capacitors for microchip embedded energy storage capacitor for implantable biomedical devices. However, these capacitors based on Al2O3/TiO2 nanolaminates can provide

146

Fundamental constants and cosmic vacuum: the micro and macro connection  

E-Print Network [OSTI]

The idea that the vacuum energy density $\\rho_{\\Lambda}$ could be time dependent is a most reasonable one in the expanding Universe; in fact, much more reasonable than just a rigid cosmological constant for the entire cosmic history. Being $\\rho_{\\Lambda}=\\rho_{\\Lambda}(t)$ dynamical, it offers a possibility to tackle the cosmological constant problem in its various facets. Furthermore, for a long time (most prominently since Dirac's first proposal on a time variable gravitational coupling) the possibility that the fundamental "constants" of Nature are slowly drifting with the cosmic expansion has been continuously investigated. In the last two decades, and specially in recent times, mounting experimental evidence attests that this could be the case. In this paper, we consider the possibility that these two groups of facts might be intimately connected, namely that the observed acceleration of the Universe and the possible time variation of the fundamental constants are two manifestations of the same underlyi...

Fritzsch, Harald

2015-01-01T23:59:59.000Z

147

Colliding Impulsive Gravitational Waves and a Cosmological Constant  

E-Print Network [OSTI]

We present a space--time model of the collision of two homogeneous, plane impulsive gravitational waves (each having a delta function profile) propagating in a vacuum before collision and for which the post collision space--time has constant curvature. The profiles of the incoming waves are $k\\,\\delta(u)$ and $l\\,\\delta(v)$ where $k, l$ are real constants and $u=0, v=0$ are intersecting null hypersurfaces. The cosmological constant $\\Lambda$ in the post collision region of the space--time is given by $\\Lambda=-6\\,k\\,l$. In this sense this model collision provides a mechanism for generating a cosmological constant and therefore may be relevant to the theoretical description of dark energy.

Barrabs, C

2015-01-01T23:59:59.000Z

148

Condensates in quantum chromodynamics and the cosmological constant  

Science Journals Connector (OSTI)

...where mesons are treated as elementary fields and QCD in which...substance, namely, (i) zero-resistance flow of electric current, and...proton subjected to a constant electric field will accelerate and...

Stanley J. Brodsky; Robert Shrock

2011-01-01T23:59:59.000Z

149

Phenomenology of infrared finite gluon propagator and coupling constant  

E-Print Network [OSTI]

We report on some recent solutions of the Dyson-Schwinger equations for the infrared behavior of the gluon propagator and coupling constant, discussing their differences and proposing that these different behaviors can be tested through hadronic phenomenology. We discuss which kind of phenomenological tests can be applied to the gluon propagator and coupling constant, how sensitive they are to the infrared region of momenta and what specific solution is preferred by the experimental data.

A. A. Natale

2006-10-23T23:59:59.000Z

150

The eta decay constant in `resummed' chiral perturbation theory  

E-Print Network [OSTI]

The recently developed 'Resummed' ChPT is illustrated on the case of pseudoscalar meson decay constants. We try to get an estimate of the eta decay constant, which is not well known from experiments, while using several ways including the Generalized ChPT Lagrangian to gather information beyond Standard next-to-leading order. We compare the results to published ChPT predictions, our own Standard ChPT calculations and available phenomenological estimates.

M. Kolesar; J. Novotny

2008-02-08T23:59:59.000Z

151

Conformal Supersymmetry Breaking and Dynamical Tuningof the Cosmological Constant  

SciTech Connect (OSTI)

We propose 'conformal supersymmetry breaking' models, which tightly relate the conformal breaking scale (i.e. R-symmetry breaking scale) and the supersymmetry breaking scale. The both scales are originated from the constant term in the superpotential through the common source of the R-symmetry breaking. We show that dynamical tuning between those mass scales significantly reduces the degree of fine-tuning necessary for generating the almost vanishing cosmological constant.

Ibe, M.; /SLAC; Nakayama, Y.; /UC, Berkeley; Yanagida, T.T.; /Tokyo U.

2008-03-07T23:59:59.000Z

152

Constant residual electrostatic electron plasma mode in Vlasov-Ampere system  

SciTech Connect (OSTI)

In a collisionless Vlasov-Poisson (V-P) electron plasma system, two types of modes for electric field perturbation exist: the exponentially Landau damped electron plasma waves and the initial-value sensitive ballistic modes. Here, the V-P system is modified slightly to a Vlasov-Ampere (V-A) system. A new constant residual mode is revealed. Mathematically, this mode comes from the Laplace transform of an initial electric field perturbation, and physically represents that an initial perturbation (e.g., external electric field perturbation) would not be damped away. Thus, this residual mode is more difficult to be damped than the ballistic mode.

Xie, Hua-sheng [Institute for Fusion Theory and Simulation, Department of Physics, Zhejiang University, Hangzhou 310027 (China)] [Institute for Fusion Theory and Simulation, Department of Physics, Zhejiang University, Hangzhou 310027 (China)

2013-11-15T23:59:59.000Z

153

Gravitation, the 'Dark Matter' Effect and the Fine Structure Constant  

E-Print Network [OSTI]

Gravitational anomalies such as the mine/borehole g anomaly, the near-flatness of the spiral galaxy rotation-velocity curves, currently interpreted as a `dark matter' effect, the absence of that effect in ordinary elliptical galaxies, and the ongoing problems in accurately determining Newton's gravitational constant G_N are explained by a generalisation of the Newtonian theory of gravity to a fluid-flow formalism with one new dimensionless constant. By analysing the borehole data this constant is shown to be the fine structure constant alpha=1/137. The spiral galaxy `dark matter' effect and the globular cluster `black hole' masses are then correctly predicted. This formalism also explains the cause of the long-standing uncertainties in G_N and leads to the introduction of a fundamental gravitational constant G not = G_N with value G=(6.6526 +/- 0.013)x 10^-11 m^3s^{-2}kg^{-1}. The occurrence of alpha implies that space has a quantum structure, and we have the first evidence of quantum gravity effects.

Reginald T. Cahill

2005-04-07T23:59:59.000Z

154

Spin-rotation and NMR shielding constants in HCl  

SciTech Connect (OSTI)

The spin-rotation and nuclear magnetic shielding constants are analysed for both nuclei in the HCl molecule. Nonrelativistic ab initio calculations at the CCSD(T) level of approximation show that it is essential to include relativistic effects to obtain spin-rotation constants consistent with accurate experimental data. Our best estimates for the spin-rotation constants of {sup 1}H{sup 35}Cl are C{sub Cl} = ?53.914kHz and C{sub H} = 42.672kHz (for the lowest rovibrational level). For the chlorine shielding constant, the ab initio value computed including the relativistic corrections, ?(Cl) = 976.202ppm, provides a new absolute shielding scale; for hydrogen we find ?(H) = 31.403ppm (both at 300K). Combining the theoretical results with our new gas-phase NMR experimental data allows us to improve the accuracy of the magnetic dipole moments of both chlorine isotopes. For the hydrogen shielding constant, including relativistic effects yields better agreement between experimental and computed values.

Jaszu?ski, Micha?, E-mail: michal.jaszunski@icho.edu.pl [Institute of Organic Chemistry, Polish Academy of Sciences, 01-224 Warszawa, Kasprzaka 44 (Poland)] [Institute of Organic Chemistry, Polish Academy of Sciences, 01-224 Warszawa, Kasprzaka 44 (Poland); Repisky, Michal; Demissie, Taye B.; Komorovsky, Stanislav; Malkin, Elena; Ruud, Kenneth [Centre for Theoretical and Computational Chemistry, University of TromsThe Arctic University of Norway, N-9037 Troms (Norway)] [Centre for Theoretical and Computational Chemistry, University of TromsThe Arctic University of Norway, N-9037 Troms (Norway); Garbacz, Piotr; Jackowski, Karol; Makulski, W?odzimierz [Laboratory of NMR Spectroscopy, Department of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw (Poland)] [Laboratory of NMR Spectroscopy, Department of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw (Poland)

2013-12-21T23:59:59.000Z

155

In situ Measurement of Robot Motor Electrical Constants  

E-Print Network [OSTI]

Motor torque constant is an important parameter in modeling and controlling a robot axis. In practice this parameter can vary considerably from the manufacturer's specification, if available, and this makes it desirable to characterise individual motors. Traditional techniques require that the motor be removed from the robot for testing, or that an elaborate technique involving weights and pulleys be employed. This paper describes a novel method for measuring the torque constant of robot servo motors in situ and is based on the equivalence of motor torque and back EMF constants. It requires a very simple experimental procedure, utilizes existing axis position sensors, and eliminates effects due to static friction and joint cross coupling. A straightforward extension to this approach can provide a measurement of motor armature impedance. Experimental results obtained for a Puma 560 are discussed and compared with other published results. 1 Introduction A large number of existing robot m...

Peter I. Corke

1996-01-01T23:59:59.000Z

156

The Expansion of the Universe and the Cosmological Constant Problem  

E-Print Network [OSTI]

The discovery that the expansion of the universe is accelerating in time is a major discovery which still awaits adequate explanation. It is generally agreed that this implies a cosmic repulsion as a result of the existence of a cosmological constant . However, estimates of the cosmological constant, based on calculations of the zero-point fluctuations of quantum fields are too large by over a hundred orders of magnitude. This result is obtained by summing the zero-point energies up to a large cutoff energy, based on the Planck scale. Since there is no compelling reason for this choice, we argue that since all known quantum electrodynamic (QED) effects involves interaction with matter, a preferred choice should be based on causality and other considerations, leading to a much lower value for the cosmological constant .

O'Connell, R F

2007-01-01T23:59:59.000Z

157

Regular Black Hole Metric with Three Constants of Motion  

E-Print Network [OSTI]

According to the no-hair theorem, astrophysical black holes are uniquely characterized by their masses and spins and are described by the Kerr metric. Several parametric spacetimes which deviate from the Kerr metric have been proposed in order to test this theorem with observations of black holes in both the electromagnetic and gravitational-wave spectra. Such metrics often contain naked singularities or closed timelike curves in the vicinity of the compact objects that can limit the applicability of the metrics to compact objects that do not spin rapidly, and generally admit only two constants of motion. The existence of a third constant, however, can facilitate the calculation of observables, because the equations of motion can be written in first-order form. In this paper, I design a Kerr-like black hole metric which is regular everywhere outside of the event horizon, possesses three independent constants of motion, and depends nonlinearly on four free functions that parameterize potential deviations from ...

Johannsen, Tim

2015-01-01T23:59:59.000Z

158

Early universe constraints on time variation of fundamental constants  

SciTech Connect (OSTI)

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

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

2008-10-15T23:59:59.000Z

159

Cosmological Evolution of Fundamental Constants: From Theory to Experiment  

E-Print Network [OSTI]

In this paper we discuss a possible cosmological time evolution of fundamental constants from the theoretical and experimental point of views. On the theoretical side, we explain that such a cosmological time evolution is actually something very natural which can be described by mechanisms similar to those used to explain cosmic inflation. We then discuss implications for grand unified theories, showing that the unification condition of the gauge coupling could evolve with cosmological time. Measurements of the electron-to-proton mass ratio can test grand unified theories using low energy data. Following the theoretical discussion, we review the current status of precision measurements of fundamental constants and their potential cosmological time dependence.

Xavier Calmet; Matthias Keller

2014-12-05T23:59:59.000Z

160

Meson masses and decay constants from unquenched lattice QCD  

SciTech Connect (OSTI)

We report results for the masses of the flavor nonsinglet light 0{sup ++}, 1{sup --}, and 1{sup +-} mesons from unquenched lattice QCD at two lattice spacings. The twisted mass formalism was used with two flavors of sea quarks. For the 0{sup ++} and 1{sup +-} mesons we look for the effect of decays on the mass dependence. For the light vector mesons we study the chiral extrapolations of the mass. We report results for the leptonic and transverse decay constants of the {rho} meson. We test the mass dependence of the KSRF relations, between the mass, leptonic coupling constant, and strong coupling of the rho meson.

Jansen, K. [DESY, Zeuthen, Platanenallee 6, D-15738 Zeuthen (Germany); McNeile, C. [Department of Physics and Astronomy, Kelvin Building, University of Glasgow, Glasgow, G12 8QQ (United Kingdom); Michael, C. [Theoretical Physics Division, Department of Mathematical Sciences, University of Liverpool, Liverpool L69 3BX (United Kingdom); Urbach, C. [Humboldt-Universitaet zu Berlin, Institut fuer Physik Mathematisch-Naturwissenschaftliche Fakultaet I, Theorie der Elementarteilchen/Phaenomenologie, Newtonstrasse 15, 12489 Berlin (Germany)

2009-09-01T23:59:59.000Z

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


161

A Modified FRW Metric to Explain the Cosmological Constant  

E-Print Network [OSTI]

One of the most outstanding problems of the standard model of cosmology today is the problem of cosmological constant/dark energy. It corresponds to about 73 per cent of the energy content of the universe gone missing. I hereby postulate a modified FRW metric for our universe, which animates a universe spinning rigidly but very slowly with an angular frequency that is equal to the Hubble constant. It is shown by a simple argument that in such a universe there will be an overlooked rotational energy whose average value is identically equal to the matter-energy content of this universe as observed by a coordinate observer.

Serkan Zorba

2012-10-02T23:59:59.000Z

162

The Quantum Vacuum and the Cosmological Constant Problem  

E-Print Network [OSTI]

The cosmological constant problem arises at the intersection between general relativity and quantum field theory, and is regarded as a fundamental problem in modern physics. In this paper we describe the historical and conceptual origin of the cosmological constant problem which is intimately connected to the vacuum concept in quantum field theory. We critically discuss how the problem rests on the notion of physical real vacuum energy, and which relations between general relativity and quantum field theory are assumed in order to make the problem well-defined.

Svend Erik Rugh; Henrik Zinkernagel

2000-12-28T23:59:59.000Z

163

The Quantum Vacuum and the Cosmological Constant Problem  

E-Print Network [OSTI]

The cosmological constant problem arises at the intersection between general relativity and quantum field theory, and is regarded as a fundamental problem in modern physics. In this paper we describe the historical and conceptual origin of the cosmological constant problem which is intimately connected to the vacuum concept in quantum field theory. We critically discuss how the problem rests on the notion of physical real vacuum energy, and which relations between general relativity and quantum field theory are assumed in order to make the problem well-defined.

Rugh, S E; Rugh, Svend Erik; Zinkernagel, Henrik

2000-01-01T23:59:59.000Z

164

Electromagnetic low-energy constants in ChPT  

E-Print Network [OSTI]

We investigate three-flavour chiral perturbation theory including virtual photons in a limit where the strange quark mass is much larger than the external momenta and the up and down quark masses, and where the external fields are those of two-flavour chiral perturbation theory. In particular we work out the strange quark mass dependence of the electromagnetic two-flavour low-energy constants C and k_i. We expect that these relations will be useful for a more precise determination of the electromagnetic low-energy constants.

Christoph Haefeli; Mikhail A. Ivanov; Martin Schmid

2007-10-29T23:59:59.000Z

165

Money Smart Many families face the constant challenge of managing  

E-Print Network [OSTI]

Money Smart Relevance Many families face the constant challenge of managing limited resources correctly. Response Money Smart is a financial management program developed by the Federal Deposit Insurance knowledge, develop financial confidence, and use banking services effectively. For almost 10 years, Money

166

MINIMAL CURVES OF CONSTANT TORSION THOMAS A. IVEY  

E-Print Network [OSTI]

moving along , the functions p, r, y may be visualized as pitch, roll, and yaw, respectively. Suppose two of some given distribution of rank two, or equivalently, of a Pfaffian system I of rank four. We may ask by Chow's theorem [7], which says that if a smooth constant rank Pfaffian system I on manifold M contains

Ivey, Thomas A.

167

Hydrolysis and formation constants at 25/sup 0/C  

SciTech Connect (OSTI)

A database consisting of hydrolysis and formation constants for about 20 metals associated with the disposal of nuclear waste is given. Complexing ligands for the various ionic species of these metals include OH, F, Cl, SO/sub 4/, PO/sub 4/ and CO/sub 3/. Table 1 consists of tabulated calculated and experimental values of log K/sub xy/, mainly at 25/sup 0/C and various ionic strengths together with references to the origin of the data. Table 2 consists of a column of recommended stability constants at 25/sup 0/C and zero ionic strength tabulated in the column headed log K/sub xy/(0); other columns contain coefficients for an extended Debye-Huckel equation to permit calculations of stability constants up to 3 ionic strength, and up to 0.7 ionic strength using the Davies equation. Selected stability constants calculated with these coefficients for various ionic strengths agree to an average of +- 2% when compared with published experimental and calculated values.

Phillips, S.L.

1982-05-01T23:59:59.000Z

168

Note on bosonic open strings in a constant B field  

Science Journals Connector (OSTI)

We sketch the main steps of old covariant quantization of bosonic open strings in a constant B field background. We comment on its space-time symmetries and the induced effective metric. The low-energy spectrum is evaluated and the appearance of a new noncommutative gauge symmetry is addressed.

Ansar Fayyazuddin and Maxim Zabzine

2000-07-21T23:59:59.000Z

169

Codes of constant Lee or Euclidean weight Jay A. Wood  

E-Print Network [OSTI]

Codes of constant Lee or Euclidean weight Jay A. Wood Department of Mathematics, Computer Science & Statistics Purdue University Calumet Hammond, Indiana 46323--2094 USA wood@calumet.purdue.edu http://www.calumet.purdue.edu/public/math/wood Scholarly Research Awards. #12; JAY A. WOOD 1. Linear codes as modules Throughout this extended abstract

Wood, Jay

170

Determination of rate constants by the frequency response method  

SciTech Connect (OSTI)

A technique based upon transmission FTIR to obtain rate constants for adsorption and desorption over supported metal catalysts has been developed and tested. The technique requires the use of a sinusoidal perturbation function imposed on steady state linearized adsorption-desorption kinetics. The measurement of a phase lag between the sinusoidal inlet gas phase forcing concentration and the response of surface coverage, together with a measurement of the maximum amplitudes of the forcing function and surface response enable the calculation of the relevant adsorption and desorption rate constants. The technique has been successfully applied to the measurement of both adsorption and desorption rate constants for CO adsorbed on a 1% Pt/SiO/sub 2/ catalyst. The values obtained for these rate constants at 343 K were: K/sub a/ = 0.147 s/sup -1/ and K/sub d/ = 7.28 x 10/sup -3/ s/sup -1/. A sticking coefficient corresponding to the adsorption of weakly bonded CO on Pt under conditions of high CO surface coverage was obtained.

Li, Y.E.; Willcox, D.; Gonzalez, R.D.

1989-03-01T23:59:59.000Z

171

Studying variation of fundamental constants with molecules V. V. Flambaum  

E-Print Network [OSTI]

directly linked to experimentally measured atomic and molecular observables. Below we will show that huge, and Oklo natural nuclear reactor give us the space-time variation of constants on the Universe lifetime scale, i.e. on times from few bil- lion to more than ten billion years. Comparison of the frequencies

Titov, Anatoly

172

CODATA recommended values of the fundamental physical constants: 2010*  

E-Print Network [OSTI]

constants and conversion factors of physics and chemistry recommended by the Committee on Data for Science. Theory of hydrogen and deuterium energy levels 1534 a. Dirac eigenvalue 1534 b. Relativistic recoil 1534 c. Nuclear polarizability 1535 d. Self energy 1535 e. Vacuum polarization 1536 f. Two

173

The Cosmological Constant Problem Service de Physique Theorique  

E-Print Network [OSTI]

and radiation, the energy momentum tensor is diagonal and determined by the energy density measured in units of energy per unit volume and p the pressure. All energy scales will be measured in units where ¯h = c = 1's constant of gravitation. The Ricci tensor measures the curvature of space­time while the energy

Paris-Sud XI, Université de

174

Measurement of the cosmological constant P. Antilogus a  

E-Print Network [OSTI]

. The usage of SN Ia to probe the vacuum energy and more generally to study the dark energy seems quite, let us expect a break through in the understanding of the dark energy, energy at the source of the observed acceleration of the universe expansion. 2. From the cosmological constant to the dark energy

Paris-Sud XI, Université de

175

CODATA Recommended Values of the Fundamental Physical Constants: 1998*  

E-Print Network [OSTI]

and conversion factors of physics and chemistry recommended by the Committee on Data for Science and Technology Institute of Physics and American Chemical Society. S0047-2689 00 00301-9 Key words: CODATA, conversion factors, data analysis, electrical units, fundamental constants, Josephson effect, least

176

CAPUT DARK ENERGY TOPICS, 2013 1. The Cosmological Constant  

E-Print Network [OSTI]

waves rule Physics Today, april 2008, 44 - Colless M. The WiggleZ Dark Energy Survey KIAS workshop 2008 Redshift Surveys ApJ 633, 575 - Seo H-J, Eisenstein D.J., 2005 Probing Dark Energy with Baryonic AcousticCAPUT DARK ENERGY TOPICS, 2013 1 #12;1. The Cosmological Constant - The acceleration

Weijgaert, Rien van de

177

WRIGHT'S CONSTANTS IN GRAPH ENUMERATION AND BROWNIAN EXCURSION AREA  

E-Print Network [OSTI]

WRIGHT'S CONSTANTS IN GRAPH ENUMERATION AND BROWNIAN EXCURSION AREA SVANTE JANSON Abstract - 1) = n n-2 for every n # 1. Wright [19] proved that for any fixed k # -1, we have the analoguous) Note the equivalent recursion formula # k+1 = 3k + 2 2 # k + k # j=0 # j # k-j , k # -1. (4) Wright

Janson, Svante

178

WRIGHT'S CONSTANTS IN GRAPH ENUMERATION AND BROWNIAN EXCURSION AREA  

E-Print Network [OSTI]

WRIGHT'S CONSTANTS IN GRAPH ENUMERATION AND BROWNIAN EXCURSION AREA SVANTE JANSON Abstract n 1. Wright [19] proved that for any fixed k -1, we have the analoguous asymptotic formula C(n, n-j, k -1. (4) Wright gives in the later paper [20] the same result in the form k = 2(1-5k)/23k1/2(k - 1

Janson, Svante

179

Mobile applications constantly demand additional memory, and traditional  

E-Print Network [OSTI]

. This remote access could reduce local storage space, thereby reducing energy demands on the mobile plat- form60 Mobile applications constantly demand additional memory, and traditional designs increase- port connected ubiquitous environments. Engineers attempt to minimize network use because of its

Lee, Hsien-Hsin "Sean"

180

Staying Informed | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

try to convey only vital information to emergency personnel andor family. Conserve your cell phone battery by reducing the brightness of your screen, placing your phone in...

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


181

staying safe at MMU Cheshire  

E-Print Network [OSTI]

.............................0345 203 099 Natwest Bank ..........................................0870 6000 459 HSBC

182

Bulk viscous FWR with time varying constants revisited  

E-Print Network [OSTI]

We study a full causal bulk viscous cosmological model with flat FRW symmetries and where the ``constants'' $G,c$ and $\\Lambda $ vary. We take into account the possible effects of a $c-$variable into the curvature tensor in order to outline the field equations. Using the Lie method we find the possible forms of the ``constants'' $G$ and $c$ that make integrable the field equations as well as the equation of state for the viscous parameter. It is found that $G,c$ and $\\Lambda $ follow a power law solution verifying the relationship $G/c^{2}=\\kappa .$ Once these possible forms have been obtained we calculate the thermodynamical quantities of the model in order to determine the possible values of the parameters that govern the quantities, finding that only a growing $G$ and $c$ are possible while $% \\Lambda $ behaves as a negative decreasing function.

J. A. Belinchn

2005-01-07T23:59:59.000Z

183

Mega-masers, Dark Energy and the Hubble Constant  

SciTech Connect (OSTI)

Powerful water maser emission (water mega-masers) can be found in accretion disks in the nuclei of some galaxies. Besides providing a measure of the mass at the nucleus, such mega-masers can be used to determine the distance to the host galaxy, based on a kinematic model. We will explain the importance of determining the Hubble Constant to high accuracy for constraining the equation of state of Dark Energy and describe the Mega-maser Cosmology Project that has the goal of determining the Hubble Constant to better than 3%. Time permitting, we will also present the scientific capabilities of the current and future NRAO facilities: ALMA, EVLA, VLBA and GBT, for addressing key astrophysical problems

Lo, Fred K. Y.

2007-10-15T23:59:59.000Z

184

Determination of Tafel constants in nonlinear polarization curves. Master's thesis  

SciTech Connect (OSTI)

The presence of nonlinear behavior in potentiodynamic polarization plots has resulted in difficulty in determining the Tafel constants from such plots. A FORTRAN-based program involving numerical-differentiation techniques was used to determine the existence of the Tafel regions. Various alloys polarized in synthetic seawater and a 3.5% NaCl solution were analyzed. Although severe concentration polarization often dominated the cathodic branches, the techniques employed did allow for the selection of regions that approached linear behavior. The effects of concentration polarization in hindering the determination of Tafel constants were exemplified by the uncovering of a cathodic branch containing a small region where only activation polarization dominated, followed by the onset and total domination of concentration polarization. A method of determining where the anodic and cathodic currents begin to dominate the potentiodynamic polarization curve is introduced.

O'Loughlin, T.E.

1987-12-01T23:59:59.000Z

185

Spectral gap and logarithmic Sobolev constant for continuous spin systems  

E-Print Network [OSTI]

The aim of this paper is to study the spectral gap and the logarithmic Sobolev constant for continuous spin systems. A simple but general result for estimating the spectral gap of finite dimensional systems is given by Theorem 1.1, in terms of the spectral gap for one-dimensional marginals. The study of the topic provides us a chance, and it is indeed another aim of the paper, to justify the power of the results obtained previously. The exact order in dimension one (Proposition 1.4), and then the precise leading order and the explicit positive regions of the spectral gap and the logarithmic Sobolev constant for two typical infinite-dimensional models are presented (Theorems 6.2 and 6.3). Since we are interested in explicit estimates, the computations become quite involved. A long section (Section 4) is devoted to the study of the spectral gap in dimension one.

Mu-Fa Chen

2010-04-26T23:59:59.000Z

186

The Speed of Light and the Fine Structure Constant  

E-Print Network [OSTI]

The fine structure constant $\\alpha $ includes the speed of light as given by $\\alpha =\\frac{e^{2}}{4\\pi \\epsilon_{0}c\\hbar}$. It is shown here that, following a $TH\\epsilon \\mu $ formalism, interpreting the permittivity $\\epsilon_{0}$ and permeabiliy $\\mu_{0}$ of free space under Lorentz local and position invariance, this is not the case. The result is a new expression as $\\alpha =\\frac{e^{2}}{4\\pi \\hbar}$ in a new system of units for the charge that preserves local and position invariance. Hence, the speed of light does not explicitly enter in the constitution of the fine structure constant. The new expressions for the Maxwell's equations are derived and some cosmological implications discussed.

Antonio Alfonso-Faus

2000-08-04T23:59:59.000Z

187

Apparatus producing constant cable tension for intermittent demand  

DOE Patents [OSTI]

This invention relates to apparatus for producing constant tension in cable or the like when it is unreeled and reeled from a drum or spool under conditions of intermittent demand. The invention is particularly applicable to the handling of superconductive cable, but the invention is also applicable to the unreeling and reeling of other strands, such as electrical cable, wire, cord, other cables, fish line, wrapping paper and numerous other materials.

Lauritzen, T.

1984-05-23T23:59:59.000Z

188

Apparatus producing constant cable tension for intermittent demand  

DOE Patents [OSTI]

The disclosed apparatus produces constant tension in superconducting electrical cable, or some other strand, under conditions of intermittent demand, as the cable is unreeled from a reel or reeled thereon. The apparatus comprises a pivotally supported swing frame on which the reel is rotatably supported, a rotary motor, a drive train connected between the motor and the reel and including an electrically controllable variable torque slip clutch, a servo transducer connected to the swing frame for producing servo input signals corresponding to the position thereof, a servo control system connected between the transducer and the clutch for regulating the torque transmitted by the clutch to maintain the swing frame in a predetermined position, at least one air cylinder connected to the swing frame for counteracting the tension in the cable, and pressure regulating means for supplying a constant air pressure to the cylinder to establish the constant tension in the cable, the servo system and the clutch being effective to produce torque on the reel in an amount sufficient to provide tension in the cable corresponding to the constant force exerted by the air cylinder. The drive train also preferably includes a fail-safe brake operable to its released position by electrical power in common with the servo system, for preventing rotation of the reel if there is a power failure. A shock absorber and biasing springs may also be connected to the swing frame, such springs biasing the frame toward its predetermined position. The tension in the cable may be measured by force measuring devices engageable with the bearings for the reel shaft, such bearings being supported for slight lateral movement. The reel shaft is driven by a Shmidt coupler which accommodates such movement.

Lauritzen, Ted (Lafayette, CA)

1985-01-01T23:59:59.000Z

189

Perfect Fluid LRS Bianchi I with Time Varying Constants  

E-Print Network [OSTI]

It is investigated the behaviour of the ``constants'' $G,$ $c$ and $\\Lambda $ in the framework of a perfect fluid LRS Bianchi I cosmological model. It has been taken into account the effects of a $c-$variable into the curvature tensor. Two exact cosmological solutions are investigated, arriving to the conclusion that if $q<0$ (deceleration parameter) then $G,$ $c$ are growing functions on time $t$ while $\\Lambda $ is a negative decreasing function on time.

J. A. Belinchn

2004-10-30T23:59:59.000Z

190

Stars in other universes: stellar structure with different fundamental constants  

SciTech Connect (OSTI)

Motivated by the possible existence of other universes, with possible variations in the laws of physics, this paper explores the parameter space of fundamental constants that allows for the existence of stars. To make this problem tractable, we develop a semi-analytical stellar structure model that allows for physical understanding of these stars with unconventional parameters, as well as a means to survey the relevant parameter space. In this work, the most important quantities that determine stellar properties-and are allowed to vary-are the gravitational constant G, the fine structure constant {alpha} and a composite parameter C that determines nuclear reaction rates. Working within this model, we delineate the portion of parameter space that allows for the existence of stars. Our main finding is that a sizable fraction of the parameter space (roughly one-fourth) provides the values necessary for stellar objects to operate through sustained nuclear fusion. As a result, the set of parameters necessary to support stars are not particularly rare. In addition, we briefly consider the possibility that unconventional stars (e.g. black holes, dark matter stars) play the role filled by stars in our universe and constrain the allowed parameter space.

Adams, Fred C, E-mail: fca@umich.edu [Michigan Center for Theoretical Physics, Department of Physics, University of Michigan, Ann Arbor, MI 48109 (United States)

2008-08-15T23:59:59.000Z

191

Hydrogen Atom and Time Variation of Fine-Structure Constant  

E-Print Network [OSTI]

In this paper, we have solved the de Sitter special relativistic ($\\mathcal{SR}_{cR}$-) Dirac equation of hydrogen in the earth-QSO(quasar) framework reference by means of the adiabatic approach. The aspects of geometry effects of de Sitter space-time described by Beltrami metric are explored and taken into account. It is found that the $\\mathcal{SR}_{cR}$-Dirac equation of hydrogen is a time dependent quantum Hamiltonian system. We provide an explicit calculation to justify the adiabatic approach in dealing with this time-dependent system. Since the radius of de Sitter sphere $R$ is cosmologically large, the evolution of the system is very slow so that the adiabatic approximation legitimately works with high accuracy. We conclude that the electromagnetic fine-structure constant, the electron mass and the Planck constant are time variations. This prediction of fine-structure constant is consistent with the presently available observation data. For confirming it further, experiments/observations are required.

Mu-Lin Yan

2009-11-21T23:59:59.000Z

192

Scattering Anisotropies in n-Type Silicon  

Science Journals Connector (OSTI)

Measurements have been made of magnetoresistance effects in several relatively pure samples of n-type silicon for the purpose of obtaining information on scattering anisotropies. The results indicate that the ratios of relaxation times parallel and perpendicular to a constant-energy-spheroid axis in the six-valley conduction band of silicon are ?II???23 for acoustic-mode intravalley lattice scattering and ?II??>1 for ionized-impurity scattering. Intervalley lattice scattering, important at higher temperatures, is isotropic.

Donald Long and John Myers

1960-10-01T23:59:59.000Z

193

Supernovae, an accelerating universe and the cosmological constant  

Science Journals Connector (OSTI)

...attributes the hydrogen-free type Ia supernovae to the thermonuclear detonation of white dwarf stars and the type II (as well...explode if a binary companion adds to its mass. When a thermonuclear burning wave destroys such a star, by burning approximately...

Robert P. Kirshner

1999-01-01T23:59:59.000Z

194

Bekenstein Bound of Information Number N and its Relation to Cosmological Parameters in a Universe with and without Cosmological Constant  

E-Print Network [OSTI]

Bekenstein has obtained is an upper limit on the entropy S, and from that, an information number bound N is deduced. In other words, this is the information contained within a given finite region of space that includes a finite amount of energy. Similarly, this can be thought as the maximum amount of information required to perfectly describe a given physical system down to its quantum level. If the energy and the region of space are finite then the number of information N required in describing the physical system is also finite. In this short letter two information number bounds are derived and compared for two types of universe. First, a universe without a cosmological constant lamda and second a universe with a cosmological constant lamda are investigated. This is achieved with the derivation of two different relations that connect the Hubble constant and cosmological constants to the number of information N. We find that the number of information N involved in a the two universes are identical or N1=N2, and that the total mass of the universe scales as the square root of the information number N, containing an information number N of the order of 10E+122. Finally, we expressed Calogero quantization action as a function of the number of information N. We also have found that in self gravitating systems the number of information N in nats is the ratio of the total kinetic to total thermal energy of the system.

Ioannis Haranas; Ioannis Gkigkitzis

2014-06-09T23:59:59.000Z

195

Conductivity and dielectric constants of LiD  

Science Journals Connector (OSTI)

The dielectric constant of LiD has been measured in the frequency region 5-500 kHz at different temperatures up to 340 C. Compared to the results of other workers, the LiD conductivity curves are found to be displaced slightly to lower values than those of LiH. Furthermore, it is also proved that the high ac-conductivity values found by other workers at low temperature in the case of LiH correspond not to true conductivity but are caused by reorientation of complexes. Activation energies corresponding to the motion of a free cation vacancy or the reorientation of complexes have been determined.

P. Varotsos

1974-02-15T23:59:59.000Z

196

Coupling constant constraints in a nonminimally coupled phantom cosmology  

SciTech Connect (OSTI)

In the paper we investigate observational constraints on coupling to gravity constant parameter {xi} using distant supernovae SNIa data, baryon oscillation peak (BOP), the cosmic microwave background radiation (CMBR) shift parameter, and the H(z) data set. We estimate the value of this parameter to constrain the extended quintessence models with nonminimally coupled to gravity phantom scalar field. The combined analysis of observational data favors a value of {xi} which lies in close neighborhood of the conformal coupling. While our estimations are model dependent they give rise to an indirect bound on the equivalence principle.

Szydlowski, Marek; Hrycyna, Orest; Kurek, Aleksandra [Astronomical Observatory, Jagiellonian University, Orla 171, 30-244 Cracow (Poland) and Mark Kac Complex Systems Research Centre, Jagiellonian University, Reymonta 4, 30-059 Cracow (Poland); Department of Theoretical Physics, Faculty of Philosophy, John Paul II Catholic University of Lublin, Al. Raclawickie 14, 20-950 Lublin (Poland); Astronomical Observatory, Jagiellonian University, Orla 171, 30-244 Cracow (Poland)

2008-01-15T23:59:59.000Z

197

The Cosmological Constant Problem and Re-interpretation of Time  

E-Print Network [OSTI]

We abandon the interpretation that time is a global parameter in quantum mechanics, replace it by a quantum dynamical variable playing the role of time. This operational re-interpretation of time provides a solution to the cosmological constant problem. The expectation value of the zero-point energy under the new time variable vanishes. The fluctuation of the vacuum energy as the leading contribution to the gravitational effect gives a correct order to the observed "dark energy". The "dark energy" as a mirage is always seen comparable with the matter energy density by an observer using the internal clock time. Conceptual consequences of the re-interpretation of time are also discussed.

M. J. Luo

2013-12-10T23:59:59.000Z

198

Lattice constants and optical response of pseudomorph Si-rich SiGe:B  

SciTech Connect (OSTI)

Pseudomorph epitaxial films of Si{sub 1?x}Ge{sub x}:B were grown on undoped (100) Si for x???0.026 and the B concentration of 1.3??10{sup 20}?cm{sup ?3}.The in-plane and out-of-plane lattice constants were determined using the X-ray techniques for 004 symmetric and 224 asymmetric diffraction. The influence of B and Ge co-doping has been detected in reflectance and ellipsometric spectra from infrared to ultraviolet. Free-hole plasma and Fano-type resonances of Si phonons and localized {sup 11}B and {sup 10}B vibrations have been observed. The spectral shift of E{sub 1} electronic transitions has been quantified. We found a simple way to test the variations of Ge content using relative reflectance spectra.

Caha, O. [CEITECCentral European Institute of Technology, Masaryk University, Kamenice 753/5, 62500 Brno (Czech Republic)] [CEITECCentral European Institute of Technology, Masaryk University, Kamenice 753/5, 62500 Brno (Czech Republic); Kostelnk, P.; ik, J. [ON Semiconductor CR, 1. Mje 2230, Ronov p. Radhot'em 75661 (Czech Republic)] [ON Semiconductor CR, 1. Mje 2230, Ronov p. Radhot'em 75661 (Czech Republic); Kim, Y. D. [Nano-Optical Property Laboratory and Department of Physics, Kyung Hee University, Seoul 130-701 (Korea, Republic of)] [Nano-Optical Property Laboratory and Department of Physics, Kyung Hee University, Seoul 130-701 (Korea, Republic of); Huml?ek, J., E-mail: humlicek@physics.muni.cz [CEITECCentral European Institute of Technology, Masaryk University, Kamenice 753/5, 62500 Brno (Czech Republic); Nano-Optical Property Laboratory and Department of Physics, Kyung Hee University, Seoul 130-701 (Korea, Republic of)

2013-11-11T23:59:59.000Z

199

Some Implications of the Cosmological Constant to Fundamental Physics  

E-Print Network [OSTI]

In the presence of a cosmological constant, ordinary Poincare' special relativity is no longer valid and must be replaced by a de Sitter special relativity, in which Minkowski space is replaced by a de Sitter spacetime. In consequence, the ordinary notions of energy and momentum change, and will satisfy a different kinematic relation. Such a theory is a different kind of a doubly special relativity. Since the only difference between the Poincare' and the de Sitter groups is the replacement of translations by certain linear combinations of translations and proper conformal transformations, the net result of this change is ultimately the breakdown of ordinary translational invariance. From the experimental point of view, therefore, a de Sitter special relativity might be probed by looking for possible violations of translational invariance. If we assume the existence of a connection between the energy scale of an experiment and the local value of the cosmological constant, there would be changes in the kinematics of massive particles which could hopefully be detected in high-energy experiments. Furthermore, due to the presence of a horizon, the usual causal structure of spacetime would be significantly modified at the Planck scale.

R. Aldrovandi; J. P. Beltran Almeida; J. G. Pereira

2007-02-12T23:59:59.000Z

200

On Killing vector fields and Newman-Penrose constants  

E-Print Network [OSTI]

Asymptotically flat spacetimes with one Killing vector field are considered. The Killing equations are solved asymptotically using polyhomogeneous expansions (i.e. series in powers of 1/r an ln r), and solved order by order. The solution to the leading terms of these expansions yield the asymptotic form of the Killing vector field. The possible classes of Killing fields are discussed by analysing their orbits on null infinity. The integrability conditions of the Killing equations are used to obtain constraints on the components of the Weyl tensor (\\Psi_0, \\Psi_1, \\Psi_2) and on the shear (\\sigma). The behaviour of the solutions to the constraint equations is studied. It is shown that for Killing fields that are non-supertranslational the characteristics of the constraint equations are the orbits of the restriction of the Killing field to null infinity. As an application, boost-rotation symmetric spacetimes are considered. The constraints on \\Psi_0 are used to study the behaviour of the coefficients that give rise to the Newman-Penrose constants, if the spacetime is non-polyhomogeneous, or the logarithmic Newman-Penrose constants if the spacetime is polyhomogeneous.

J. A. Valiente-Kroon

1999-03-25T23:59:59.000Z

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


201

Chemistry of tributyl phosphate and nitric acid at constant volume  

SciTech Connect (OSTI)

This paper addresses the reaction of tributyl phosphate (TBP) with nitric acid (HNO{sub 3}). The reaction pressure of TBP/HNO{sub 3} mixtures as a function of time was measured under constant volume. A simplified model, which parametrically includes autocatalysis, was used to plot the total gas production of the reaction as a function of time. Comparison of the functions shows a rough equivalence in the induction time, reaction time, and total gas production. Predictions of the amounts of reaction products as a function of time were made based on assumptions regarding autocatalysis and using rate constants from experimental data. The derived reaction mechanisms and experimental results have several implications. Tests with a large amount of venting and high surface to volume ratio will show very different behavior than tests with increasing confinement and low surface to volume ratios. The amount alkyl nitrate, carbon monoxide, or hydrogen that reacts within the organic phase is limited by their solubilities and volatilities. The overall yield of both heat and gas per mol of nitric acid or TBP will vary significantly depending on the amount of solution, free volume, and vessel vent capacity.

Agnew, S.F.; Eisenhawer, S.W.; Morris, J.S. [Los Alamos National Lab., NM (United States)

1995-12-31T23:59:59.000Z

202

Long range constant force profiling for measurement of engineering surfaces  

Science Journals Connector (OSTI)

A new instrument bridging the gap between atomic force microscopes (AFMs) and stylus profiling instruments is described. The constant force profiler is capable of subnanometer resolution over a 15??m vertical range with a horizontal traverse length of 50 mm. This long traverse length coupled with the possibilities of utilizing standard radius diamondmeasurement styli make the force profiler more compatible with existing profiling instrument standards. The forces between the specimen and a diamond stylus tipped cantilever spring are sensed as displacements using a capacitance bridge. This displacement signal is then fed through a proportional plus integral controller to a high stability piezoelectric actuator to maintain a constant tip?to?sample force of approximately 100 nN. Much of the sensor head and traverse mechanism is made of Zerodur glass?ceramic to provide the thermal stability needed for long travel measurements. Profiles of a 30?nm silica step height standard and an 8.5??m step etched on Zerodur are presented.

L. P. Howard; S. T. Smith

1992-01-01T23:59:59.000Z

203

Types of Commissioning  

Broader source: Energy.gov [DOE]

Several commissioning types exist to address the specific needs of equipment and systems across both new and existing buildings. The following commissioning types provide a good overview.

204

Granuloma annulare, patch type  

E-Print Network [OSTI]

Granuloma annulare, patch type Frank C Victor MD, Stephaniewas consistent with patch-type granuloma annulare. He wascm, annular, erythematous patch without scale was present on

Victor, Frank C; Mengden, Stephanie

2008-01-01T23:59:59.000Z

205

Types of Costs Types of Cost Estimates  

E-Print Network [OSTI]

first cost or capital investment): ­ Expenditures made to acquire or develop capital assets ­ Three main· Types of Costs · Types of Cost Estimates · Methods to estimate capital costs MIN E 408: Mining-site management or corporate level expenditure · Direct vs. Indirect Costs ­ Direct (or variable) costs apply

Boisvert, Jeff

206

Types of Costs Types of Cost Estimates  

E-Print Network [OSTI]

-Revenue Relationships · Capital Costs (or first cost or capital investment): ­ Expenditures made to acquire or develop05-1 · Types of Costs · Types of Cost Estimates · Methods to estimate capital costs MIN E 408 ­ off-site management or corporate level expenditure · Direct vs. Indirect Costs ­ Direct (or variable

Boisvert, Jeff

207

Testing the cosmological constant as a candidate for dark energy  

SciTech Connect (OSTI)

It may be difficult to single out the best model of dark energy on the basis of the existing and planned cosmological observations, because many different models can lead to similar observational consequences. However, each particular model can be studied and either found consistent with observations or ruled out. In this paper, we concentrate on the possibility to test and rule out the simplest and by far the most popular of the models of dark energy, the theory described by general relativity with positive vacuum energy (the cosmological constant). We evaluate the conditions under which this model could be ruled out by the future observations made by the Supernova/Acceleration Probe SNAP (both for supernovae and weak lensing) and by the Planck Surveyor cosmic microwave background satellite.

Kratochvil, Jan; Linde, Andrei; Linder, Eric V.; Shmakova, Marina

2003-12-03T23:59:59.000Z

208

Molecular Dynamics Simulations of Solutions at Constant Chemical Potential  

E-Print Network [OSTI]

Molecular Dynamics studies of chemical processes in solution are of great value in a wide spectrum of applications, that range from nano-technology to pharmaceutical chemistry. However, these calculations are affected by severe finite-size effects, such as the solution being depleted as the chemical process proceeds, that influence the outcome of the simulations. To overcome these limitations, one must allow the system to exchange molecules with a macroscopic reservoir, thus sampling a Grand-Canonical ensemble. Despite the fact that different remedies have been proposed, this still represents a key challenge in molecular simulations. In the present work we propose the C$\\mu$MD method, which introduces an external force that controls the environment of the chemical process of interest. This external force, drawing molecules from a finite reservoir, maintains the chemical potential constant in the region where the process takes place. We have applied the C$\\mu$MD method to the paradigmatic case of urea crystall...

Perego, Claudio; Parrinello, Michele

2015-01-01T23:59:59.000Z

209

Asymptotics with a positive cosmological constant: I. Basic framework  

E-Print Network [OSTI]

The asymptotic structure of the gravitational field of isolated systems has been analyzed in great detail in the case when the cosmological constant $\\Lambda$ is zero. The resulting framework lies at the foundation of research in diverse areas in gravitational science. Examples include: i) positive energy theorems in geometric analysis; ii) the coordinate invariant characterization of gravitational waves in full, non-linear general relativity; iii) computations of the energy-momentum emission in gravitational collapse and binary mergers in numerical relativity and relativistic astrophysics; and iv) constructions of asymptotic Hilbert spaces to calculate $S$-matrices and analyze the issue of information loss in the quantum evaporation of black holes. However, by now observations have established that $\\Lambda$ is positive in our universe. In this paper we show that, unfortunately, the standard framework does not extend from the $\\Lambda =0$ case to the $\\Lambda >0$ case in a physically useful manner. In partic...

Ashtekar, Abhay; Kesavan, Aruna

2014-01-01T23:59:59.000Z

210

On gravitational waves in spacetimes with a nonvanishing cosmological constant  

SciTech Connect (OSTI)

We study the effect of a cosmological constant {lambda} on the propagation and detection of gravitational waves. To this purpose we investigate the linearized Einstein's equations with terms up to linear order in {lambda} in a de Sitter and an anti-de Sitter background spacetime. In this framework the cosmological term does not induce changes in the polarization states of the waves, whereas the amplitude gets modified with terms depending on {lambda}. Moreover, if a source emits a periodic waveform, its periodicity as measured by a distant observer gets modified. These effects are, however, extremely tiny and thus well below the detectability by some 20 orders of magnitude within present gravitational wave detectors such as LIGO or future planned ones such as LISA.

Naef, Joachim; Jetzer, Philippe; Sereno, Mauro [Institut fuer Theoretische Physik, Universitaet Zuerich, Winterthurerstrasse 190, CH-8057 Zuerich (Switzerland)

2009-01-15T23:59:59.000Z

211

Path Integral Confined Dirac Fermions in a Constant Magnetic Field  

E-Print Network [OSTI]

We consider Dirac fermion confined in harmonic potential and submitted to a constant magnetic field. The corresponding solutions of the energy spectrum are obtained by using the path integral techniques. For this, we begin by establishing a symmetric global projection, which provides a symmetric form for the Green function. Based on this, we show that it is possible to end up with the propagator of the harmonic oscillator for one charged particle. After some transformations, we derive the normalized wave functions and the eigenvalues in terms of different physical parameters and quantum numbers. By interchanging quantum numbers, we show that our solutions possed interesting properties. The density of current and the non-relativistic limit are analyzed where different conclusions are obtained.

Abdeldjalil Merdaci; Ahmed Jellal; Lyazid Chetouani

2014-04-17T23:59:59.000Z

212

Determination of the Boltzmann Constant Using the Differential - Cylindrical Procedure  

E-Print Network [OSTI]

We report in this paper the progresses on the determination of the Boltzmann constant using the acoustic gas thermometer (AGT) of fixed-length cylindrical cavities. First, we present the comparison of the molar masses of pure argon gases through comparing speeds of sound of gases. The procedure is independent from the methodology by Gas Chromatography-Mass Spectrometry (GC-MS). The experimental results show good agreement between both methods. The comparison offers an independent inspection of the analytical results by GC-MS. Second, we present the principle of the novel differential-cylindrical procedure based on the AGT of two fixed-length cavities. The deletion mechanism for some major perturbations is analyzed for the new procedure. The experimental results of the differential-cylindrical procedure demonstrate some major improvements on the first, second acoustic and third virial coefficients, and the excess half-widths. The three acoustic virial coefficients agree well with the stated-of-the-art experime...

Feng, X J; Lin, H; Gillis, K A; Moldover, M R

2015-01-01T23:59:59.000Z

213

Abstract--There are two types of drivers in production machine systems: constant velocity (CV) motor and servo-motor.  

E-Print Network [OSTI]

the dynamic model of the five-bar hybrid mechanism including its electric motors. Section 3 presents) motor and servo-motor. If a system contains two drivers or more, among which some are of the CV motor while the other are the servo-motor, the system has the so-called hybrid driver architecture

Zhang, WJ "Chris"

214

Measurement of Interfacial Charge-Transfer Rate Constants at n-Type InP/CH3OH Junctions  

Science Journals Connector (OSTI)

Katherine E. Pomykal and Nathan S. Lewis * ... Nagasubramanian, G.; Wheeler, B. L.; Bard, A. J. J. Electrochem. ...

Katherine E. Pomykal; Nathan S. Lewis

1997-04-03T23:59:59.000Z

215

Shearforce-Based Constant-Distance Scanning Electrochemical Microscopy as Fabrication Tool for Needle-Type Carbon-Fiber Nanoelectrodes  

Science Journals Connector (OSTI)

Coating the stems but not the end of the tips of the tapered structures with anodic electrodeposition paint was the strategy for limiting the bare carbon to the foremost end and restricting a feasible voltammetry current response to exactly this section. ... The vibrating carbon fiber tip was fixed in space and the electrochemical cell for the EDP deposition was moved through a stage of three joined stepper motors (SPI Robot Systems, Oppenheim, Germany) with a nominal resolution in x-, y-, and z-direction of 10 nm per microstep. ... Furthermore, electrodeposition paints are com. ...

Emad Mohamed Hussien; Wolfgang Schuhmann; Albert Schulte

2010-06-09T23:59:59.000Z

216

Variable Speed Drive (VSD) Applications in Dual-Duct Constant Volume Systems  

E-Print Network [OSTI]

Models have been developed for static pressure and potential supply fan energy savings by using variable speed drive (VSD) in dual-duct constant volume systems. Experiments have been performed using a full size dual-duct constant volume system...

Joo, I.; Liu, M.; Conger, K.; Wang, G.

2002-01-01T23:59:59.000Z

217

Small sample size power for some tests of constant hazard function  

E-Print Network [OSTI]

. This method has been applied to testing for a fit of the exponential distribution. Four different. tests of constant hazard function were used in this research. They are described in detail in Section 2. Two of the tests were developed by Epstein [1960... that on a whole these four particular tests would give a definite insight into the behavior of power for constant hazard function tests. SECTION 2 CONSTANT HAZARD FUNCTION TESTS Background As stated in Section 1, four different tests of constant...

Fercho, Wayne Ward

2012-06-07T23:59:59.000Z

218

Physics 250 -Measurements of the Fine Structure Constant Derek Kimball January 2000 1  

E-Print Network [OSTI]

Physics 250 - Measurements of the Fine Structure Constant Derek Kimball January 2000 1 #12;Physics 250 - Measurements of the Fine Structure Constant Derek Kimball January 2000 2 #12;Physics 250 - Measurements of the Fine Structure Constant Derek Kimball January 2000 3 #12;Physics 250 - Measurements

Budker, Dmitry

219

OPTICAL CONSTANTS OF THIN FILMS FROM THE CHARACTERISTIC ELECTRON ENERGY LOSSES  

E-Print Network [OSTI]

114. OPTICAL CONSTANTS OF THIN FILMS FROM THE CHARACTERISTIC ELECTRON ENERGY LOSSES By R. E in the photon energy range from 5 to 30 eV. The optical constants of aluminum from 2 500 A to 6 500 A have been à une étude de l'oscillateur optique. Abstract. 2014 A method for obtaining the optical constants

Paris-Sud XI, Université de

220

Observability analysis of 2D single beacon navigation in the presence of constant  

E-Print Network [OSTI]

that in the presence of known ocean currents, the system is found to be globally observable for constant relative hand, with unknown ocean currents the system fails to be locally weakly observable with constant and ocean current configuration. Interestingly, observability can be achieved with constant (nonzero

Instituto de Sistemas e Robotica

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


221

Types of Hydropower Plants  

Broader source: Energy.gov [DOE]

There are three types of hydropower facilities: impoundment, diversion, and pumped storage. Some hydropower plants use dams and some do not. The images below show both types of hydropower plants.

222

Theory of Dielectric Constants of LiF  

Science Journals Connector (OSTI)

The static and high-frequency dielectric constants and the effective charge of LiF are calculated on the basis of a simplified model in which the polarizability of the positive ion is neglected and that of the negative ion is attributed entirely to perturbations in the outermost subshell (2p) of electrons. The present calculation differs from the variational treatment of Yamashita mainly in the inclusion of perturbed wave functions differs from the variational treatment of Yamashita mainly in the inclusion of perturbed wave functions for the 2p electrons which are orthogonal to the core-electron wave functions. Also, different methods are employed in evaluating portions of the energy of the crystal in a field and in deducing the effective charge ratio e*e from the calculated energy. It is found that the use of trial wave functions which preserve the orthogonality within individual ions is of prime importance, and leads to results in generally better agreement with observation than the previously used nonorthogonal functions.

Edwin R. Levin and Elmer L. Offenbacher

1960-06-01T23:59:59.000Z

223

On the possible running of the cosmological "constant"  

E-Print Network [OSTI]

Despite the many outstanding cosmological observations leading to a strong evidence for a nonvanishing cosmological constant (CC) term in the gravitational field equations, the theoretical status of this quantity seems to be lagging well behind the observational successes. It thus seems timely to revisit some fundamental aspects of the CC term in Quantum Field Theory (QFT). We emphasize that, in curved space-time, nothing a priori prevents this term from potentially having a mild running behavior associated to quantum effects. Remarkably, this could be the very origin of the dynamical nature of the Dark Energy, in contrast to many other popular options considered in the literature. In discussing this possibility, we also address some recent criticisms concerning the possibility of such running. Our conclusion is that, while there is no comprehensive proof of the CC running, there is no proof of the non-running either. The problem can be solved only through a deeper understanding of the vacuum contributions of massive quantum fields on a curved spacetime background. We suggest that such investigations are at the heart of one of the most important endeavors of fundamental theoretical cosmology in the years to come.

Ilya L. Shapiro; Joan Sola

2009-10-26T23:59:59.000Z

224

Can the cosmological "constant" run? - It may run  

E-Print Network [OSTI]

Using standard quantum field theory, we discuss several theoretical aspects of the possible running of the cosmological constant (CC) term in Einstein's equations. The basic motivation for the present work is to emphasize that this possibility should also be taken into account when considering dynamical models for the dark energy (DE), which are nowadays mainly focused on identifying the DE with the energy density associated to one or more ad hoc scalar fields. At the same time, we address some recent criticisms that have been published (or privately communicated to us) attempting to cast doubts on the fundamental possibility of such running. In this work, we argue that while there is no comprehensive proof of the CC running, there is no rigorous proof of the non-running either. In particular, some purported "non-running theorem" recently adduced in the literature is, in our opinion, completely insubstantial and formally incorrect. The way to the CC running is, therefore, still open and we take here the opportunity to present a pedagogical review of the present state of the art in this field, including a a brief historical account.

Ilya L. Shapiro; Joan Sola

2008-10-04T23:59:59.000Z

225

Typing aspects for MATLAB  

Science Journals Connector (OSTI)

The MATLAB programming language is heavily used in many scientific and engineering domains. Part of the appeal of the language is that one can quickly prototype numerical algorithms without requiring any static type declarations. However, this lack of ... Keywords: MATLAB, dynamic type assertions, typing aspects

Laurie Hendren

2011-03-01T23:59:59.000Z

226

Organic Macromolecular High Dielectric Constant Materials: Synthesis, Characterization, and Applications  

Science Journals Connector (OSTI)

It will lead to a thermal effect and perhaps thermal failure of devices. ... The white light was then overlapped with the pump beam in a 2 mm quartz cuvette containing the sample, and the change in the absorbance for the signal was collected by a CCD detector (Ocean Optics). ... In many ?-conjugated organic materials, up-converted ultrafast fluorescence dynamics and anisotropy decay experiments have been applied successfully to reveal possible ultrafast processes, such as vibrational relaxation and singletsinglet annihilation, occurring in a time scale shorter than 20 ps, and to validate the presence and type of intramolecular energy and charge transfer processes. ...

Meng Guo; Teruaki Hayakawa; Masa-aki Kakimoto; Theodore Goodson; III

2011-09-27T23:59:59.000Z

227

Atom interferometric techniques for measuring gravitational acceleration and constant magnetic field gradients  

E-Print Network [OSTI]

We discuss two techniques for probing the effects of a homogeneous force acting on cold atoms, such as that due to gravity or a constant magnetic field gradient, using grating echo-type atom interferometers. A comprehensive theoretical description of signals generated by both two-pulse and three-pulse interferometers, accounting for magnetic sub-levels in the atomic ground state, is shown to agree with experimental results. Laser-cooled samples of $^{85}$Rb with temperatures as low as 2.4 $\\mu$K have been achieved in a relatively large glass cell with well-suppressed magnetic fields. Using transit time limited interferometer signals, we demonstrate sensitivity to externally applied magnetic gradients as small as $\\sim 4$ mG/cm. With these timescales we estimate that precision measurements of the gravitational acceleration, $g$, are possible with both the two-pulse and three-pulse echo interferometers. Whereas the two-pulse signal is a position-sensitive technique to measure the absolute value of $g$, the thre...

Barrett, B

2011-01-01T23:59:59.000Z

228

Structure disorder degree of polysilicon thin films grown by different processing: Constant C from Raman spectroscopy  

SciTech Connect (OSTI)

Flat, low-stress, boron-doped polysilicon thin films were prepared on single crystalline silicon substrates by low pressure chemical vapor deposition. It was found that the polysilicon films with different deposition processing have different microstructure properties. The confinement effect, tensile stresses, defects, and the Fano effect all have a great influence on the line shape of Raman scattering peak. But the effect results are different. The microstructure and the surface layer are two important mechanisms dominating the internal stress in three types of polysilicon thin films. For low-stress polysilicon thin film, the tensile stresses are mainly due to the change of microstructure after thermal annealing. But the tensile stresses in flat polysilicon thin film are induced by the silicon carbide layer at surface. After the thin film doped with boron atoms, the phenomenon of the tensile stresses increasing can be explained by the change of microstructure and the increase in the content of silicon carbide. We also investigated the disorder degree states for three polysilicon thin films by analyzing a constant C. It was found that the disorder degree of low-stress polysilicon thin film larger than that of flat and boron-doped polysilicon thin films due to the phase transformation after annealing. After the flat polysilicon thin film doped with boron atoms, there is no obvious change in the disorder degree and the disorder degree in some regions even decreases.

Wang, Quan, E-mail: wangq@mail.ujs.edu.cn [School of mechanical engineering, Jiangsu University, Zhenjiang 212013 (China); State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000 (China); Zhang, Yanmin; Hu, Ran; Ren, Naifei [School of mechanical engineering, Jiangsu University, Zhenjiang 212013 (China); Ge, Daohan [School of mechanical engineering, Jiangsu University, Zhenjiang 212013 (China); State Key Laboratory of Transducer Technology, Chinese Academy of Sciences, Shanghai 200050 (China)

2013-11-14T23:59:59.000Z

229

Confronting the relaxation mechanism for a large cosmological constant with observations  

E-Print Network [OSTI]

In order to deal with a large cosmological constant a relaxation mechanism based on modified gravity has been proposed recently. By virtue of this mechanism the effect of the vacuum energy density of a given quantum field/string theory (no matter how big is its initial value in the early universe) can be neutralized dynamically, i.e. without fine tuning, and hence a Big Bang-like evolution of the cosmos becomes possible. Remarkably, a large class F^n_m of models of this kind, namely capable of dynamically adjusting the vacuum energy irrespective of its value and size, has been identified. In this paper, we carefully put them to the experimental test. By performing a joint likelihood analysis we confront these models with the most recent observational data on type Ia supernovae (SNIa), the Cosmic Microwave Background (CMB), the Baryonic Acoustic Oscillations (BAO) and the high redshift data on the expansion rate, so as to determine which ones are the most favored by observations. We compare the optimal relaxation models F^n_m found by this method with the standard or concordance LambdaCDM model, and find that some of these models may appear as almost indistinguishable from it. Interestingly enough, this shows that it is possible to construct viable solutions to the tough cosmological fine tuning problem with models that display the same basic phenomenological features as the concordance model.

Spyros Basilakos; Florian Bauer; Joan Sola

2012-01-03T23:59:59.000Z

230

Rock types, pore types, and hydrocarbon exploration  

SciTech Connect (OSTI)

A proposed exploration-oriented method of classifying porosity in sedimentary rocks is based on microscopic examination cores or cuttings. Factors include geometry, size, abundance, and connectivity of the pores. The porosity classification is predictive of key petrophysical characteristics: porosity-permeability relationships, capillary pressures, and (less certainly) relative permeabilities. For instance, intercrystalline macroporosity typically is associated with high permeability for a given porosity, low capillarity, and favorable relative permeabilities. This is found to be true whether this porosity type occurs in a sucrosic dolomite or in a sandstone with pervasive quartz overgrowths. This predictive method was applied in three Rocky Mountain oil plays. Subtle pore throat traps could be recognized in the J sandstone (Cretaceous) in the Denver basin of Colorado by means of porosity permeability plotting. Variations in hydrocarbon productivity from a Teapot Formation (Cretaceous) field in the Powder River basin of Wyoming were related to porosity types and microfacies; the relationships were applied to exploration. Rock and porosity typing in the Red River Formation (Ordovician) reconciled apparent inconsistencies between drill-stem test, log, and mud-log data from a Williston basin wildcat. The well was reevaluated and completed successfully, resulting in a new field discovery. In each of these three examples, petrophysics was fundamental for proper evaluation of wildcat wells and exploration plays.

Coalson, E.B.; Hartmann, D.J.; Thomas, J.B.

1985-05-01T23:59:59.000Z

231

The Structure of a Tunicate C-type Lectin from Polyandrocarpa misakiensis Complexed with  

E-Print Network [OSTI]

, Hills Road, Cambridge CB2 2QH, UK C-type lectins are calcium-dependent carbohydrate-recognising proteins misakiensis revealed the presence of a single calcium atom per monomer with a dissociation constant of 2.6 m in structure from other C-type lectins mainly in the diverse loop regions and in the second a-helix, which

Williams, Roger L.

232

A study of microstrip delay lines on high dielectric constant substrates.  

E-Print Network [OSTI]

??Microstrip delay lines have many possible applications in today's world of high frequency communications and radar systems. High dielectric constant (high-x) substrates allow for the (more)

Ashour, Thomas Joseph

2012-01-01T23:59:59.000Z

233

Second-order elastic constants of AgCl from 20 to 430C  

Science Journals Connector (OSTI)

The three independent adiabatic second-order elastic constants of AgCl have been measured from 20 to 430C using the McSkimin pulse-superposition technique. Two single crystals with (110) and (001) axes were used in the measurements. Measurements on the (110) crystal gave the complete set of constants and showed that the longitudinal elastic constant C11?=(C11+C12+2C44)2 decreased by 37%, the shear constant C44 decreased by 15%, and the shear constant C?=(C11-C12)2 decreased by 65% over this temperature range. The longitudinal elastic constant C11 decreased by 45%, the elastic constant C12 decreased by 31% and the bulk modulus Bs=(C11+2C12)3 decreased by 37%. The (001) crystal was used as a check on the consistency of the measurements. The decreases in the elastic constants are linear, as expected, until approximately 320C, whereupon C11?, C44, C11, C12, and Bs begin to decrease more rapidly than linearly and are 6.8, 0.8, 6.0, 9.2, and 8.0%, respectively, below the expected linearity at 430C. By contrast, the shear constant C? decreases linearly over the entire temperature range. The elastic constant behavior thus becomes anomalous near the melting point, just like many of the other physical properties of the silver halides. This anomalous behavior may be attributed to the unusually high defect concentration near the melting point. Similar changes in elastic constants are seen in superionic conductors near the transition into the superionic state: a large decrease in C11, but only small changes in C44. This may indicate that the silver halides are just starting the transition to the superionic state when the halide sublattice melts and the transition is frustrated.

W. C. Hughes and L. S. Cain

1996-03-01T23:59:59.000Z

234

Document Type: Subject Terms  

E-Print Network [OSTI]

Title: Authors: Source: Document Type: Subject Terms: Abstract: Full Text Word Count: ISSN the department back on track. The action is to call a meeting of the team leaders and stress the urgency o

Major, Arkady

235

Indeterminacy with Constant Money Growth Rules and Income-Based Liquidity Constraints  

E-Print Network [OSTI]

Indeterminacy with Constant Money Growth Rules and Income-Based Liquidity Constraints Stefano Bosi Abstract We study the implications of constant money growth rules on the sta- bility properties. In this context, the steady state value of the velocity of money becomes a cru- cial parameter for gauging whether

Boyer, Edmond

236

Measurement of the Axial-Vector Coupling Constant $g_A$ in Neutron Beta Decay  

E-Print Network [OSTI]

The matrix element \\Vud of the CKM matrix can be determined by two independent measurements in neutron decay: the neutron lifetime $\\tau_n$ and the ratio of coupling constants $\\lambda=g_A/g_V$, which is most precisely determined by measurements of the beta asymmetry angular correlation coefficient~$A$. We present recent progress on the determination of these coupling constants.

Bastian Maerkisch; Hartmut Abele

2014-10-15T23:59:59.000Z

237

Universal Gravitational Constant EX-9908 Page 1 of 13 Re-Written by Geoffrey R. Clarion  

E-Print Network [OSTI]

Newton was able to deduce his law of universal gravitation. Newton's law of universal gravitation: 2 21 rUniversal Gravitational Constant EX-9908 Page 1 of 13 Re-Written by Geoffrey R. Clarion Universal Gravitational Constant EQUIPMENT 1 Gravitational Torsion Balance AP-8215 1 X-Y Adjustable Diode Laser OS-8526A 1

Dai, Pengcheng

238

Video Description Length Guided Constant Quality Video Coding with Bitrate Constraint  

E-Print Network [OSTI]

Video Description Length Guided Constant Quality Video Coding with Bitrate Constraint Lei Yang propose a new video encoding strategy -- Video description length guided Constant Quality video coding with Bitrate Constraint (V-CQBC), for large scale video transcoding systems of video charing websites

Tomkins, Andrew

239

Numerical Analysis of Non-constant Discounting with an Application to Renewable Resource Management  

E-Print Network [OSTI]

Numerical Analysis of Non-constant Discounting with an Application to Renewable Resource Management illustrate the approach by studying welfare and observational equivalence for a particular renewable resource man- agement problem. Keywords: Non-constant discounting, numerical methods, non-renewable resources

Karp, Larry S.

240

Macdonald's Constant Term Conjectures For Exceptional Root Systems* Frank G. Garvan and Gaston Gonnet  

E-Print Network [OSTI]

Macdonald's Constant Term Conjectures For Exceptional Root Systems* A Frank G. Garvan and Gaston Gonnet bstract: We announce proofs of Macdonald's constant term conjectures for the affine root systems result mply that Macdonald's conjectures are true in form for any root system, and the complete truth

Garvan, Frank

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


241

Polynomial time algorithms for constant capacitated single-item lot sizing problem with stepwise production cost  

E-Print Network [OSTI]

production cost Ayse Akbalik , Christophe Rapine LGIPM, Université de Lorraine, Ile du Saulcy, 57045 Metz. Assuming constant production capacity, constant batch size and Wagner- Whitin cost structure, we derive O sizing problem, stepwise costs, polynomial time algorithm, dynamic programming. 1. Introduction We study

Paris-Sud XI, Université de

242

Calculation of hyperfine coupling constants of radicals by density-functional theory  

Science Journals Connector (OSTI)

Hyperfine coupling constants for small radicals have been calculated using the density-functional theory with a gradient-corrected (GC) local-spin-density approximation (LSDA). The agreement between the calculated and observed results is fairly good. The GC-LSDA is essential to calculate the isotropic hyperfine coupling constants for ? radicals. For ? radicals, the simple LSDA also leads to relatively good results.

Nobuhiko Ishii and Tatsuo Shimizu

1993-08-01T23:59:59.000Z

243

Dynamics of kinematically constrained bimolecular reactions having constant product recoil energy  

E-Print Network [OSTI]

Dynamics of kinematically constrained bimolecular reactions having constant product recoil energy reactions in which the product recoil energy is assumed constant (CPR approximation). It is further assumed-shaped, peaking at the vibrational level with an energy equal to the reaction exoergicity minus the product recoil

Zare, Richard N.

244

MODIFICATION DE LA CHAMBRE DE COMPENSATION D'UN RESPIROMTRE A PRESSION CONSTANTE  

E-Print Network [OSTI]

MODIFICATION OF THE COMPENSATION CHAMBER OF A CONSTANT PRESSURE RESPIROMETER A change was madeNOTE MODIFICATION DE LA CHAMBRE DE COMPENSATION D'UN RESPIROM?TRE A PRESSION CONSTANTE Andrée PIHET compensation (appelée aussi fiole de référence) qui élimine les effets des changements barométriques et

Boyer, Edmond

245

Weak Interactions in Atoms Nuclear Anapole Moment Weak Coupling Constants Nuclear Anapole Moment  

E-Print Network [OSTI]

Weak Interactions in Atoms Nuclear Anapole Moment Weak Coupling Constants Nuclear Anapole Moment;Weak Interactions in Atoms Nuclear Anapole Moment Weak Coupling Constants Plan of the talk Weak Interactions in Atoms Charged and Neutral Currents. Effective P-odd Hamiltonian Nuclear Anapole Moment

Pines, Alexander

246

AN EXTENDED NICHOLS CHART WITH CONSTANT MAGNITUDE LOCI OF SENSITIVITY AND  

E-Print Network [OSTI]

AN EXTENDED NICHOLS CHART WITH CONSTANT MAGNITUDE LOCI OF SENSITIVITY AND COMPLEMENTARY SENSITIVITY chart) and constant magnitude loci MS of |S(j)|. While the for- mer are part of standard methodologies the complementary sensitivity and sensitivity functions. In order to handle such resonance peak specifications

Regruto, Diego

247

FDTD Analysis of Patch Antennas on High Dielectric-Constant Substrates Surrounded  

E-Print Network [OSTI]

P42655 1 FDTD Analysis of Patch Antennas on High Dielectric-Constant Substrates Surrounded constant is the dominant mechanism affecting the radiation pattern of a patch antenna fabricated along the dielectric substrate, thus reducing the unwanted diffraction. Patch antennas surrounded

Tentzeris, Manos

248

Type I Tanks  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

I Tanks I Tanks * 12 Type I tanks were built between 1951-53 * 750,000 gallon capacity; 75 feet in diameter by 24 ½ feet high * Partial secondary containment with leak detection * Contain approximately 10 percent of the waste volume * 7 Type I tanks have leaked waste into the tank annulus; the amount of waste stored in these tanks is kept below the known leak sites that have appeared over the decades of

249

Jansen type of spondylometaphyseal dysplasia  

Science Journals Connector (OSTI)

Metaphyseal dysplasia, type Jansen (JMD), is a rare skeletal dysplasia ... we propose the term spondylometaphyseal dysplasia, type Jansen.

J. B. Campbell; Kazimierz Kozlowski; Tadeusz Lejman; J. Sulko

2000-04-01T23:59:59.000Z

250

Constant extension rate tensile tests on 304L stainless steel in simulated hazardous low-level waste  

SciTech Connect (OSTI)

New waste tanks which handle hazardous low-level waste were proposed to be constructed in H-area. The candidate material for the tanks is AISI Type 304L (304L) stainless steel. Constant extension rate tensile (CERT) tests were conducted to assess the susceptibility of 304L to stress-corrosion cracking (SCC) in these waste solutions. The tests demonstrated that 304L was not susceptible to SCC in simulated wastes. Based on these tests and previous pitting corrosion studies 304L is a suitable material of construction for the new tanks. Comparison tests in the same simulants were performed on A537 carbon steel (A537), a material that is similar to material of construction for the current tanks. Stress-corrosion cracking was indicated in two of the simulants. If carbon steel tanks are utilized to handle the hazardous low-level wastes, inhibitors such as nitrite or hydroxide will be necessary to prevent corrosion.

Wiersma, B.J.

1992-04-01T23:59:59.000Z

251

Characterization of high-power lithium-ion cells during constant current cycling. Part I. Cycle performance and electrochemical diagnostics  

SciTech Connect (OSTI)

Twelve-cm{sup 2} pouch type lithium-ion cells were assembled with graphite anodes, LiNi{sub 0.8}Co{sub 0.15}Al{sub 0.05}O{sub 2} cathodes and 1M LiPF{sub 6}/EC/DEC electrolyte. These pouch cells were cycled at different depths of discharge (100 percent and 70 percent DOD) at room temperature to investigate cycle performance and pulse power capability. The capacity loss and power fade of the cells cycled over 100 percent DOD was significantly faster than the cell cycled over 70 percent DOD. The overall cell impedance increased with cycling, although the ohmic resistance from the electrolyte was almost constant. From electrochemical analysis of each electrode after cycling, structural and/or impedance changes in the cathode are responsible for most of the capacity and power fade, not the consumption of cycleable Li from side-reactions.

Shim, Joongpyo; Striebel, Kathryn A.

2003-01-24T23:59:59.000Z

252

TYPE OF OPERATION  

Office of Legacy Management (LM)

3!NEEi_S1 3!NEEi_S1 past: -~~~-~~~~~-~~~---------- current: ------------_------------- Owner contacted q yes g no; if ye=, date contacted TYPE OF OPERATION --~~__--~-~~~---- 5 Research & Development 5 Facility Type 0 Production scale testing c1 Pilot Scale 0 Bench Scale Process z Theareti cal Studi es Sample Sr Analysis 0 Production D Disposal/Storage TYPE OF CONTRACT ---------------- 0 Manufacturing 0 University 0 Research Clrganization B Government Cpanaored Faci 1 i ty 0 Other ~~---~~---_--~~-----_ a Prime 13 Subcontract& D PurcSase Order 0 Other information (i.e., cost + fixed fee, unit price, time & material, +z) ----_----------------------- Cantract/Purchaae Order #-d-z=&-/) -2_7~-------------Is_------------ PERIOD: CONTRACTING I%~(?) - 1465

253

Environment-Dependent Fundamental Physical Constants in the Theory of General Inconstancy  

E-Print Network [OSTI]

A theory of special inconstancy, in which some fundamental physical constants such as the fine-structure and gravitational constants may vary, is proposed in pregeometry. In the special theory of inconstancy, the \\alpha-G relation of \\alpha=3\\pi/[16ln(4\\pi/5GM_W^2)] between the varying fine-structure and gravitaional constants (where M_W is the charged weak boson mass) is derived from the hypothesis that both of these constants are related to the same fundamental length scale in nature. Furthermore, it leads to the prediction of dot{{\\alpha}}/\\alpha=(-0.8\\pm2.5)\\times10^{-14}yr^{-1} from the most precise limit of dot{G}/G=(-0.6\\pm2.0)\\times10^{-12}yr^{-1} by Thorsett, which is not only consistent with the recent observation of dot{{\\alpha}}/\\alpha=(0.5\\pm0.5)\\times10^{-14}yr^{-1} by Webb et al. but also feasible for future experimental tests. Also a theory of general inconstancy, in which any fundamental physical constants may vary, is proposed in "more general relativity", by assuming that the space-time is "environment-dependent". In the general theory of inconstancy, the G-\\Lambda\\ relation between the varying gravitational and cosmological constants is derived from the hypothesis that the space-time metric is a function of \\tau, the "environment-coodinate", in addition to x^{\\mu}, the ordinary space-time coodinates. Furthermore, it leads to the prediction of the varying cosmological constant, which is consistent with the present observations. In addition, the latest observation of spatial variation in the fine-structure constant from VLT/UVES of (1.1\\pm 0.2)\\times 10^{-6}GLyr^{-1} by King et al. is suggested to be taken as a clear evidence for environment-dependent fundamental physical constants

Hidezumi Terazawa

2012-02-09T23:59:59.000Z

254

Types of quantum information  

E-Print Network [OSTI]

Quantum, in contrast to classical, information theory, allows for different incompatible types (or species) of information which cannot be combined with each other. Distinguishing these incompatible types is useful in understanding the role of the two classical bits in teleportation (or one bit in one-bit teleportation), for discussing decoherence in information-theoretic terms, and for giving a proper definition, in quantum terms, of ``classical information.'' Various examples (some updating earlier work) are given of theorems which relate different incompatible kinds of information, and thus have no counterparts in classical information theory.

Robert B. Griffiths

2007-07-25T23:59:59.000Z

255

Types of quantum information  

Science Journals Connector (OSTI)

Quantum, in contrast to classical, information theory, allows for different incompatible types (or species) of information which cannot be combined with each other. Distinguishing these incompatible types is useful in understanding the role of the two classical bits in teleportation (or one bit in one-bit teleportation), for discussing decoherence in information-theoretic terms, and for giving a proper definition, in quantum terms, of classical information. Various examples (some updating earlier work) are given of theorems which relate different incompatible kinds of information, and thus have no counterparts in classical information theory.

Robert B. Griffiths

2007-12-21T23:59:59.000Z

256

On the classification of type D spacetimes  

E-Print Network [OSTI]

We give a classification of the type D spacetimes based on the invariant differential properties of the Weyl principal structure. Our classification is established using tensorial invariants of the Weyl tensor and, consequently, besides its intrinsic nature, it is valid for the whole set of the type D metrics and it applies on both, vacuum and non-vacuum solutions. We consider the Cotton-zero type D metrics and we study the classes that are compatible with this condition. The subfamily of spacetimes with constant argument of the Weyl eigenvalue is analyzed in more detail by offering a canonical expression for the metric tensor and by giving a generalization of some results about the non-existence of purely magnetic solutions. The usefulness of these results is illustrated in characterizing and classifying a family of Einstein-Maxwell solutions. Our approach permits us to give intrinsic and explicit conditions that label every metric, obtaining in this way an operational algorithm to detect them. In particular a characterization of the Reissner-Nordstr\\"{o}m metric is accomplished.

J. J. Ferrando; J. A. Sez

2002-12-20T23:59:59.000Z

257

Prompt neutron decay constants in uranium diluted with matrix material systems  

SciTech Connect (OSTI)

Rossi-Alpha measurements were performed on uranium diluted with matrix material systems to determine the prompt neutron decay constants. These constants represent an eigenvalue characteristic of these particular critical assemblies, which can be experimentally measured by the Rossi-Alpha or pulse neutron source techniques and calculated by a deterministic or Monte Carlo method. In the measurements presented in this summary, highly enriched foils diluted in various X/{sup 235}U ratios with polyethylene and SiO{sub 2}, and polyethylene and aluminum were assembled to a high multiplication and the prompt neutron decay constants were obtained by the Rossi-Alpha technique.

Sanchez, R. G. (Rene G.); Loaiza, D. J. (David J.); Brunson, G. S. (Glenn S.)

2001-01-01T23:59:59.000Z

258

Full causal bulk viscous LRS Bianchi I with time varying constants  

E-Print Network [OSTI]

In this paper we study the evolution of a LRS Bianchi I Universe, filled with a bulk viscous cosmological fluid in the presence of time varying constants "but" taking into account the effects of a c-variable into the curvature tensor. We find that the only physical models are those which ``constants'' $G$ and $c$ are growing functions on time $t$, while the cosmological constant $\\Lambda$ is a negative decreasing function. In such solutions the energy density obeys the ultrastiff matter equation of state i.e. $\\omega=1$.

J. A. Belinchn

2004-10-15T23:59:59.000Z

259

Note: Spring constant calibration of nanosurface-engineered atomic force microscopy cantilevers  

Science Journals Connector (OSTI)

The determination of the dynamic spring constant (k d ) of atomic force microscopy cantilevers is of crucial importance for converting cantilever deflection to accurate force data. Indeed the non-destructive fast and accurate measurement method of the cantilever dynamic spring constant by Sader et al. [Rev. Sci. Instrum.83 103705 (2012)] is confirmed here for plane geometry but surface modified cantilevers. It is found that the measured spring constants (k eff the dynamic one k d ) and the calculated (k d 1) are in good agreement within less than 10% error.

2014-01-01T23:59:59.000Z

260

Fusion systems of -type  

Science Journals Connector (OSTI)

We prove results on 2-fusion systems related to the 2-fusion systems of groups of Lie type over the field of order 2 and certain sporadic groups. The results are used in a later paper to determine the N-systems: the 2-fusion systems of N-groups.

Michael Aschbacher

2013-01-01T23:59:59.000Z

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


261

Pruning Simply Typed -terms  

Science Journals Connector (OSTI)

......looking for the smallest pout > r /) 6out > //_ gout > B,, c/) pout > p such that: pout...and pout h ^out . Bout b y minimaiKy o f tout gout pout w e deduce; 6out gout gout^ pout < pout Pruning Simply Typed A-terms......

STEFANO BERARDI

1996-10-01T23:59:59.000Z

262

A constant-mass fuel delivery system for use in underwater autonomous vehicles  

E-Print Network [OSTI]

This thesis describes the design and assembly of two constant-mass fuel tanks to be used in autonomous underwater vehicles (AUVs). The fuel tanks are part of a power supply designed to increase AUV endurance without limiting ...

Saxton-Fox, Theresa Ann

2012-01-01T23:59:59.000Z

263

Improved Measurement of the Muon Lifetime and Determination of the Fermi Constant  

E-Print Network [OSTI]

The MuLan collaboration has measured the lifetime of the positve muon to a precision of 1.0 parts per million. The Fermi constant is determined to a precision of 0.6 parts per million.

P. T. Debevec

2011-08-22T23:59:59.000Z

264

The creation of fiberglass tanks and parts for autonomous underwater vehicle constant buoyancy power supply  

E-Print Network [OSTI]

The purpose of this thesis was to construct and seal air and containment tanks and other parts for a constant buoyancy power supply for an Autonomous Underwater Vehicle, or AUV. While multiple materials and techniques were ...

Sack, Jean H. (Jean Hope)

2013-01-01T23:59:59.000Z

265

New Approaches Indicate Constant Viral Diversity despite Shifts in Assemblage Structure in an Australian Hypersaline Lake  

Science Journals Connector (OSTI)

...Microbiology New Approaches Indicate Constant...and Planetary Science, University...Environmental Science, Policy, and Management, University...of Biological Sciences, University...developed an approach to estimate viral...

Joanne B. Emerson; Brian C. Thomas; Karen Andrade; Karla B. Heidelberg; Jillian F. Banfield

2013-08-30T23:59:59.000Z

266

Use of Rough Sets and Spectral Data for Building Predictive Models of Reaction Rate Constants  

Science Journals Connector (OSTI)

A model for predicting the log of the rate constants for alkaline hydrolysis of organic esters has been developed with the use of gas-phase mid-infrared library spectra and a...

Collette, Timothy W; Szladow, Adam J

1994-01-01T23:59:59.000Z

267

Measurement of the Elastic Constants of Lithium Acetate by Means of the Brillouin Effect  

Science Journals Connector (OSTI)

The numerical values of the elastic constants at room temperature are given. The significance of the results and the various causes of uncertainty are discussed. Indices of refraction and density are also measured.

R. Vacher; L. Boyer; M. Boissier

1972-07-15T23:59:59.000Z

268

A study of microstrip delay lines on high dielectric constant substrates  

E-Print Network [OSTI]

Microstrip delay lines have many possible applications in today's world of high frequency communications and radar systems. High dielectric constant (high-x) substrates allow for the building of miniaturized microstrip delay fines which...

Ashour, Thomas Joseph

2012-06-07T23:59:59.000Z

269

Analysis of three-phase rectifiers with constant-voltage loads  

E-Print Network [OSTI]

This work presents a quantitative analysis of the operating characteristics of three-phase diode bridge rectifiers with AC-side reactance and constant-voltage loads. We focus on the case where the AC-side currents vary ...

Caliskan, Vahe

270

Low-Frequency Dielectric Constant of LiF, NaF, NaCl, NaBr, KCl, and KBr by the Method of Substitution  

Science Journals Connector (OSTI)

The 1000-Hz 300K dielectric constants of some alkali halides were measured to an accuracy of 0.01% by the method of substitution. Reproducibly different values for various crystals of the same type were obtained which varied beyond the experimental error. The ranges of results for various crystals of each type measured are LiF, 9.0355-9.0360; NaF, 5.0719-5.0722; NaCl, 5.8940-5.8956; NaBr, 6.3957-6.3974; KCl, 4.8112-4.8182; and KBr, 4.8735-4.8762. The spread for each type of crystal is thought to be attributable to random trace impurities. The numbers are discussed in the light of past values.

Carl Andeen; John Fontanella; Donald Schuele

1970-12-15T23:59:59.000Z

271

The characteristics of atmospheric radio frequency discharges with frequency increasing at a constant power density  

SciTech Connect (OSTI)

A computational model is used to investigate the characteristics of atmospheric radio frequency discharges by increasing frequency from 20 to 100 MHz at a constant power density. The simulation results show that increasing frequency can effectively enhance electron density before the transition frequency but after it the ignition is quenched then the electron density decreases. However this simulation also indicates the maximum time-averaged electron energy reduces monotonically with the excitation frequency increasing at a constant power density.

Zhang Yuantao; Li Qingquan; Lou Jie; Li Qingmin [School of Electrical Engineering, Shandong University, Jinan, Shandong Province 250061 (China)

2010-10-04T23:59:59.000Z

272

The export responsiveness of the Argentine grain export marketing system: a constant market share analysis  

E-Print Network [OSTI]

THE EXPORT RESPONSIVENESS OF THE ARGENTINE GRAIN EXPORT MARKET NG SYSTEM: A CONSTANT MARKET SHARE ANALYSIS A Thesis by SCOTT ALAN MILLIMET Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement... for the degree of MASTER OF SCIENCE May 1982 Ma) or Subject: Agricultural Economics THE EXPORT RESPONSIVENESS OF THE ARGENTINE GRAIN EXPORT MARKETING SYSTEM: A CONSTANT MARKET SHARE ANALYSIS A Thesis by SCOTT ALAN MILLIMET Approved as to style...

Millimet, Scott Alan

1982-01-01T23:59:59.000Z

273

Atomic force microscope cantilever spring constant evaluation for higher mode oscillations: A kinetostatic method  

SciTech Connect (OSTI)

Our previous study of the particle mass sensor has shown a large ratio (up to thousands) between the spring constants of a rectangular cantilever in higher mode vibration and at the static bending or natural mode vibration. This has been proven by us through the derived nodal point position equation. That solution is good for a cantilever with the free end in noncontact regime and the probe shifted from the end to an effective section and contacting a soft object. Our further research shows that the same nodal position equation with the proper frequency equations may be used for the same spring constant ratio estimation if the vibrating at higher mode cantilever's free end has a significant additional mass clamped to it or that end is in permanent contact with an elastic or hard measurand object (reference cantilever). However, in the latter case, the spring constant ratio is much smaller (in tens) than in other mentioned cases at equal higher (up to fourth) vibration modes. We also present the spring constant ratio for a vibrating at higher eigenmode V-shaped cantilever, which is now in wide use for atomic force microscopy. The received results on the spring constant ratio are in good (within a few percent) agreement with the theoretical and experimental data published by other researchers. The knowledge of a possible spring constant transformation is important for the proper calibration and use of an atomic force microscope with vibrating cantilever in the higher eigenmodes for measurement and imaging with enlarged resolution.

Tseytlin, Yakov M. [Instrument Society of America, 20 Randall Street, Apt. 5G, Providence, Rhode Island 02904 (United States)

2008-02-15T23:59:59.000Z

274

TYPE OF OPERATION  

Office of Legacy Management (LM)

Owner c:ontacted Owner c:ontacted TYPE OF OPERATION ----------------_ jJ Research & Development 0 Production scale testing Cl Pilot Scale 0 Bench Scale Process i Theoretical Studies Sample & Analysis B Production 0 Disposal/Storage $r Prime 0 Subcontract& 0 Purchase Order 0 Facility Type 0 Manufacturing 0 University 0 Research Organization a Other information (i.e., cost + fixed fern, unit price,' time & mate ~r~~-r~~tf~-_~_-_~-~f-~~J~ d ial, etc)_kl/Jlfits ---- -7---- -- Contract/Purchase Order # w?@7-e?-b $ 6, i;,_~~~~~----------------- - ----- C_O!!IF!KXYE-PEELEg: -lTlL-/L?~J --------------------------- OWNERSHXP: AEWHEC AEC/HED' GOVT GB' JT SiXiRACTOR CONiRkCiGR WEE LEAs_EE a!!!%? IEEE!? --------_ ..---LEASED ._ OWNED LANDS BUILDINGS EQUIPMENT

275

TYPE OF OPERATION  

Office of Legacy Management (LM)

OWNEF? (S) OWNEF? (S) Current: ____ LcrcJksLG! _________ Owner contacted n yes WI-IO; if yes, date contacted-- TYPE OF OPERATION ----_-------_---- m Research & Development Cl Pilot Scale Cl Disposal/Storaqe TYPE OF CDNTRACT ---__------__--- q Prime 0 Subcnntractor Cl Purchase Order 0 Other infcrmation (i.e., cnst + fixed fee, unit price, time 84 materi+, e.tc) v-7Y07-&G-W ---------------------------- Contract/Pur&aae Order # 0 -?+7- FJc-(CL --___--------~----_______________ CONTRACTING PEXIOD: fl& ,&I;'"'-?;': (&e-?)_-- ' ------------------ OWNERSHIP: AEC/MED GEC/MED SOVT GOVT CONTRACTOR CCNTRACTOR OWNE3 LEASE3 OWNE3 LEASED OWNE3 ----- ------ ----- ------ -__------- LE.352 LANDS u u q BUILDINGS EQUIPMENT 0 FINAL PRODUCT WASTE G RESIDUE a

276

TYPE OF OPERATION  

Office of Legacy Management (LM)

~~__--------_____ ~~__--------_____ q Research & Development q Production scale testing Cl Pilat Scale 0 Bench Scale Process 0 Theoretical Studies a Sample & Analysis c] Production 0 Disposal/Storage TYPE OF CONTRACT ~~__-------_--__ 0 Prime 0 Subcontractor 0 Purchase Order a d//F- a Faci 1 i ty Type a tlanuf acturi ng 0 University q Research Organization 0 Government Sponsored Facility a other --------------__----- Other information (i.e., cost + fixed fee, unit price, time & material, qtr) ------- -1------------------_L______ Contract/Purchase Order # CONTRACTING PE?IOD- 42 --------------L---- --------- ----------------_---______ OWNERSHIP: AEC/MED AEC/tlED OWNED ----- LE_A_sEE GOUT GO' JT CONTRACTOR E!!!!E!z LEASED - ----_ ---_OW_E!L LANDS BUILDINGS

278

Interdiffusion and free-boundary problem for r-component (r?2) one-dimensional mixtures showing constant concentration  

Science Journals Connector (OSTI)

The concept of separation of diffusional and drift flows, i.e., the postulate that the total mass flow is a sum of diffusion flux and translation only, is applied for the general case of diffusional transport in an r-component compound (process defined as interdiffusion in a one-dimensional mixture). The equations of local mass conservation (continuity equations), the appropriate expressions describing the fluxes (drift flux and diffusional flux), and momentum conservation equation (equation of motion) allow a complete quantitative description of diffusional transport process (in one-dimensional mixture showing constant concentration) to be formulated. The equations describing the interdiffusion process (mixing) in the general case where the components diffusivities vary with composition are derived. If certain regularity assumptions and a quantitative condition (concerning the diffusion coefficientsproviding a parabolic type of the final equation) are fulfilled, then there exists the unique solution of the interdiffusion problem. Good agreement between the numerical solution obtained with the use of Faedo-Galerkin method and experimental data is shown. An effective algebraic criterion allows us to determine the parabolic type of a particular problem. A condition for the up-hill diffusion in the three component mixture is given and a universal example of such effect is demonstrated. The results extend the standard Darken approach. The phenomenology allows the quantitative data on the dynamics of the processes to be obtained within an interdiffusion zone.

K. Holly and M. Danielewski

1994-11-01T23:59:59.000Z

279

Hottest spot temperatures in ventilated dry type transformers  

SciTech Connect (OSTI)

The hottest spot temperature allowance to be used for the different insulation system temperature classes is a major unknown facing IEEE Working Groups developing standards and loading guides for ventilated dry type transformers. In 1944, the hottest spot temperature allowance for ventilated dry type transformers was established as 30 C for 80 C average winding temperature rise. Since 1944, insulation temperature classes have increased to 220 C but IEEE standards continue to use a constant 30 C hottest spot temperature allowance. IEC standards use a variable hottest spot temperature allowance from 5 to 30 C. Six full size test windings were manufactured with imbedded thermocouples and 133 test runs performed to obtain temperature rise data. The test data indicated that the hottest spot temperature allowance used in IEEE standards for ventilated dry type transformers above 500 kVA is too low. This is due to the large thermal gradient from the bottom to the top of the windings caused by natural convection air flow through the cooling ducts. A constant ratio of hottest spot winding temperature rise to average winding temperature rise should be used in product standards for all insulation temperature classes. A ratio of 1.5 is suggested for ventilated dry type transformers above 500 kVA. This would increase the hottest spot temperature allowance from 30 C to 60 C and decrease the permissible average winding temperature rise from 150 C to 120 C for the 220 C insulation temperature class.

Pierce, L.W. (General Electric Co., Rome, GA (United States))

1994-01-01T23:59:59.000Z

280

TYPE OF OPERATION  

Office of Legacy Management (LM)

_---------_-- _---------_-- Research & Development 0 Production scale testing Cl Pilat Scale 0 Bench Scale Process 0 Theoretical Studies Cl Sample SC Analysis !J Production 0 Dis.posal/Storage 0 Prime ." 0 Subcontract& 0 Purchase Order 0 Facility Type 0 Manufacturing 0 University 0 Research Org&ization 0 Government Sponsored Facility Cl Other ---------_---__-____- Other information (i.e., cost + fixed fee, unit price, time & material, gtr) Coni+act/Purchase Order # ---------------------_--_________ C!2kEE~_CIL_N_G-EE~LE~: /5J--L-,r4 53 -------------------------------------- OWNERSHIP: AEC/MED AEC/MED GOVT GOVT CONTRACTOR CONTRACTOR !w!!E? ___--- " EWNED LEASED L_EesEE OWNED LEASED ---------_ --_------ LANDS BUILDINGS ' EQUIPMENT

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


281

Rate types for stream programs  

Science Journals Connector (OSTI)

We introduce RATE TYPES, a novel type system to reason about and optimize data-intensive programs. Built around stream languages, RATE TYPES performs static quantitative reasoning about stream rates -- the frequency of data items in a stream being ... Keywords: data processing rates, data throughput, performance reasoning, stream programming, type systems

Thomas W. Bartenstein, Yu David Liu

2014-10-01T23:59:59.000Z

282

Molecular Simulation of Henry's Constant at Vapor-Liquid and Liquid-Liquid Phase Richard J. Sadus  

E-Print Network [OSTI]

coexistence. 1. Introduction Henry's constant is a well-known measure of a solute's solubility in a particularMolecular Simulation of Henry's Constant at Vapor-Liquid and Liquid-Liquid Phase Boundaries Richard to determine Henry's constant from the residual chemical potential at infinite dilution at the vapor-liquid

283

Handbook of Physical Constants Edited by S. P. Clarke, Jr. (Geological Society of America, $8.75)  

Science Journals Connector (OSTI)

......book-review Book Reviews Handbook of Physical Constants Edited...8.75) T. F. Gaskell Handbook of Physical Constants S. P...polarization. J. M. BRUCKSHAW Handbook of Physical Constants Edited...Earth Science library which does not already have this classic......

T. F. Gaskell

1967-06-01T23:59:59.000Z

284

Economical method for the determination of group constants for reactor lattices  

SciTech Connect (OSTI)

The development of an economical method for determining accurately group constants of hexagonal and rectangular cells is considered in this dissertation. The mathematical model constructed for this purpose has the capability to characterize the group constants for the entire range of the neutron spectrum. Furthermore, this model is also rigorous enough to predict the group constants with the required accuracy for a specific range of interest in the energy spectrum and for a variety of energy group configurations. The group constants calculated wih the economical model have been benchmarked with those computed by the VIM Monte Carlo code. The values obtained for the group constants agree within 1-2% with those computed by VIM for the fast energy region. The agreements for the thermal energy region are within 2-3%. The CPU running time of the implemented model is about 3 1/2 minutes for a four group configuration. On the other hand a typical VIM run comprising 25,000 neutron histories and a four-group structure expends about 30 minutes of CPU time for light water moderated systems. Moreover, similar VIM runs utilizing heavy water as moderator require over one hour of CPU time. Therefore, the implemented model makes utilization of computer resources with a cost advantage of a factor of 10 or better as compared to VIM.

Rogow, R.

1984-01-01T23:59:59.000Z

285

ORNL Supplier Database- Stay in Touch!  

Broader source: Energy.gov [DOE]

Small business owners seeking to do business with the U.S. Department of Energy may already be aware ofthe Oak Ridge Supplier Database. The Small Business Programs Office at Oak Ridge National...

286

RELATIONSHIP SAFETY Staying Safe in Relationships  

E-Print Network [OSTI]

. Sex offenders can find and take advantage of young people on the Internet. Abuse usually involves one or in person, caution is needed. What seems like a promising relationship can sometimes become an abusive one of physical, sexual, or emotional abuse. While females are more at risk for violence, both genders can

Meyers, Steven D.

287

stay healthy, my friends PREVENT THE SPREAD  

E-Print Network [OSTI]

secretions by close personal contact, such as coughing, sharing drinks, and kissing, or being in close NOT cough into anyone's face. Cough into your sleeve or tissue. Wash or sanitize hands frequently. drinking

Akhmedov, Azer

288

g-Factor of Heavy Ions: A New Access to the Fine Structure Constant  

SciTech Connect (OSTI)

A possibility for a determination of the fine structure constant in experiments on the bound-electron g-factor is examined. It is found that studying a specific difference of the g-factors of B- and H-like ions of the same spinless isotope in the Pb region to the currently accessible experimental accuracy of 7x10{sup -10} would lead to a determination of the fine structure constant to an accuracy which is better than that of the currently accepted value. Further improvements of the experimental and theoretical accuracy could provide a value of the fine structure constant which is several times more precise than the currently accepted one.

Shabaev, V.M. [Department of Physics, St. Petersburg State University, Oulianovskaya 1, Petrodvorets, St. Petersburg 198504 (Russian Federation); Gesellschaft fuer Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt (Germany); Glazov, D.A.; Oreshkina, N.S. [Department of Physics, St. Petersburg State University, Oulianovskaya 1, Petrodvorets, St. Petersburg 198504 (Russian Federation); Volotka, A.V. [Department of Physics, St. Petersburg State University, Oulianovskaya 1, Petrodvorets, St. Petersburg 198504 (Russian Federation); Institut fuer Theoretische Physik, TU Dresden, Mommsenstrasse 13, D-01062 Dresden (Germany); Plunien, G. [Institut fuer Theoretische Physik, TU Dresden, Mommsenstrasse 13, D-01062 Dresden (Germany); Kluge, H.-J.; Quint, W. [Gesellschaft fuer Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt (Germany)

2006-06-30T23:59:59.000Z

289

STABILITY CONSTANTS OF NP(V) COMPLEXES WITH FLOURIDE AND SULFATE AT VARIABLE TEMPERATURES  

SciTech Connect (OSTI)

A solvent extraction method was used to determine the stability constants of Np(V) complexes with fluoride and sulfate in 1.0 M NaClO{sub 4} from 25 C to 60 C. The distribution ratio of Np(V) between the organic and aqueous phases was found to decrease as the concentrations of fluoride and sulfate were increased. Stability constants of the 1:1 Np(V)-fluoride complexes and the 1:1 Np(V)-sulfate and 1:2 Np(V)-sulfate complexes, dominant in the aqueous phase under the experimental conditions, were calculated from the effect of [F{sup -}] and [SO{sub 4}{sup 2-}] on the distribution ratio. The enthalpy and entropy of complexation were calculated from the stability constants at different temperatures by using the Van't Hoff equation.

Y. Xia; J.I. Friese; D.A. Moore; L. Rao

2005-07-11T23:59:59.000Z

290

The Cosmological Constant of One-Dimensional Matter Coupled Quantum Gravity is Quantized  

E-Print Network [OSTI]

Coupling any interacting quantum mechanical system to gravity in one dimension requires the cosmological constant to belong to the matter energy spectrum and thus to be quantized, even though the gravity sector is free of any quantum dynamics, while physical states are also confined to the subspace of matter quantum states whose energy coincides with the cosmological constant value. These general facts are illustrated through some simple examples. The physical projector quantization approach readily leads to the correct representation of such systems, whereas other approaches relying on gauge fixing methods are often plagued by Gribov problems in which case the quantization rule is not properly recovered. Whether such a quantization of the cosmological constant as well as the other ensuing consequences in terms of physical states extend to higher dimensional matter-gravity coupled quantum systems is clearly a fascinating open issue.

Govaerts, J

2002-01-01T23:59:59.000Z

291

Complex Dielectric Constant of KH2PO4 at 9.2 Gc/sec  

Science Journals Connector (OSTI)

The temperature dependence of the dielectric constant and loss tangent in potassium dihydrogen phosphate along and normal to the optic axis has been measured by a cavity perturbation method at 9.2 Gc/sec. The dielectric constants agree with earlier low-frequency measurements. The parallel dielectric constant exhibits a modified Curie-Weiss behavior which may be described by (T-Tc)?c?=A?+BT, with Tc=119 K, A?=2.27103 K, B=4.7. The parallel loss tangent also has an approximate Curie-Weiss dependence which may be described by (T-Tc)tan?c=?+?T+?T2, with ?=8.4210-1 K, ?=-9.4910-4, and ?=8.4910-6 (K)-1. This result is discussed in terms of Silverman's treatment of the microwave loss in strontium titanate. The implications of these measurements for microwave light modulation are also discussed.

I. P. Kaminow and G. O. Harding

1963-02-15T23:59:59.000Z

292

Dynamical friction in constant density cores: a failure of the Chandrasekhar formula  

E-Print Network [OSTI]

Using analytic calculations and N-body simulations we show that in constant density (harmonic) cores, sinking satellites undergo an initial phase of very rapid (super-Chandrasekhar) dynamical friction, after which they experience no dynamical friction at all. For density profiles with a central power law profile of log-slope, $-\\alpha$, the infalling satellite heats the background and causes $\\alpha$ to decrease. For $\\alpha < 0.5$ initially, the satellite generates a small central constant density core and stalls as in the $\\alpha = 0$ case. We discuss some astrophysical applications of our results to decaying satellite orbits, galactic bars and mergers of supermassive black hole binaries. In a companion paper we show that a central constant density core can provide a natural solution to the timing problem for Fornax's globular clusters.

J. I. Read; Tobias Goerdt; Ben Moore; A. P. Pontzen; Joachim Stadel; George Lake

2006-06-26T23:59:59.000Z

293

Coupling constant metamorphosis and Nth order symmetries in classical and quantum mechanics  

E-Print Network [OSTI]

We review the fundamentals of coupling constant metamorphosis (CCM) and the St\\"ackel transform, and apply them to map integrable and superintegrable systems of all orders into other such systems on different manifolds. In general, CCM does not preserve the order of constants of the motion or even take polynomials in the momenta to polynomials in the momenta. We study specializations of these actions which do preserve polynomials and also the structure of the symmetry algebras in both the classical and quantum cases. We give several examples of non-constant curvature 3rd and 4th order superintegrable systems in 2 space dimensions obtained via CCM, with some details on the structure of the symmetry algebras preserved by the transform action.

E. G. Kalnins; W. Miller Jr.; S. Post

2009-08-31T23:59:59.000Z

294

Direct Test of the Time-Independence of Fundamental Nuclear Constants Using the Oklo Natural Reactor  

E-Print Network [OSTI]

[NOTE: This 1983 preprint is being uploaded to arXiv.org after the death of its author, who supported online distribution of his work. Contact info of the submitter is at http://ilya.cc .] The positions of neutron resonances have been shown to be highly sensitive to the variation of fundamental nuclear constants. The analysis of the measured isotopic shifts in the natural fossil reactor at Oklo gives the following restrictions on the possible rates of the interaction constants variation: strong ~2x10^-19 yr^-1, electromagnetic ~5x10^-18 yr^-1, weak ~10^-12 yr^-1. These limits permit to exclude all the versions of nuclear constants contemporary variation discussed in the literature. URL: http://alexonline.info >. For more recent analyses see hep-ph/9606486, hep-ph/0205206 and astro-ph/0204069 .

Alexander I. Shlyakhter

2003-07-03T23:59:59.000Z

295

Our Knowledge of the Fundamental Constants of Physics and Chemistry in 1965  

Science Journals Connector (OSTI)

Experimental data bearing on the precision determination of the numerical values of the fundamental physical constants are reviewed, with particular emphasis being placed on the identification and isolation of discrepancies and inconsistencies. The purpose of the analysis is to present a consistent set of values of the fundamental constants and to present a careful and complete description of the steps taken to reach this end. The Introduction discusses the significance of such an analysis and indicates the general method of approach. The indispensability of local unit systems and conversion factors connecting them, in order to avoid a sacrifice of precision peculiar to different metrological techniques, is emphasized. The point is stressed that conversion constants introduce the danger of ignoring error-statistical correlations between physically measured quantities, and the effects of such correlations on the assignment of errors is discussed. All available sources of experimental information relative to the necessary input data are presented, and changes in definitions of units since our last review are discussed. After the available stochastic input data have been reviewed and the less reliable items eliminated, the third section examines the remainder for mutual compatibility by means of an analysis of variance in which special criteria for recognizing the incompatibility of a datum are developed, using the analogy of the energy of internal strain introduced in overdetermined mechanical structures. Tables of least-squares adjusted values of fundamental constants and conversion factors of physics and chemistry based on the 1963 adjustment are given. Research pertinent to the constants which has been completed or published subsequent to the 1963 "recommended" adjustment is discussed, and the effect of these on our knowledge of the numerical values of the fundamental constants is presented.

E. RICHARD COHEN and JESSE W. M. DuMOND

1965-10-01T23:59:59.000Z

296

TYPE OF OPERATION  

Office of Legacy Management (LM)

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297

TYPE OF OPERATION  

Office of Legacy Management (LM)

______ ______ 0 Research & Development 9 Faciiity Type 0 Production scale testing Cl Pilot Scale 0 Bench Scale Process 0 Theoretical Studies Cl Sample 84 Analysis Production Di aposal /Storage g ;E:"V',;=:;;';"" IJ Research Organization 0 Government Sponeored Facility q Other --------------------- 0 Prime q ,@ Subcontract& Other information (i.e., cost 0 Purchase Order + fixed fee, unit price, time ?8 material, etc) -------mm----+------------- Contract/Purchase Order # CONTRACTING PERIODr c&L&.& rqs-z i i -----~_--~~~_----_ -------------------------------------- OWNERSHIP8 CIEC/tlED CIEC/MED GOUT WNED LE&xU _o!!EED LANDS BUILDINGS EQUIPMENT iii E : ORE OR RAW MATL IJ : E FINCIL PRODUCT [7 WCISTE b RESIDUE q GOUT

298

Generation of SFR few-group constants using the Monte Carlo code Serpent  

SciTech Connect (OSTI)

In this study, the Serpent Monte Carlo code was used as a tool for preparation of homogenized few-group cross sections for the nodal diffusion analysis of Sodium cooled Fast Reactor (SFR) cores. Few-group constants for two reference SFR cores were generated by Serpent and then employed by nodal diffusion code DYN3D in 2D full core calculations. The DYN3D results were verified against the references full core Serpent Monte Carlo solutions. A good agreement between the reference Monte Carlo and nodal diffusion results was observed demonstrating the feasibility of using Serpent for generation of few-group constants for the deterministic SFR analysis. (authors)

Fridman, E.; Rachamin, R. [Helmholz-Zentrum Dresden-Rossendorf, POB 510119, Dresden, 01314 (Germany); Shwageraus, E. [Ben-Gurion University, POB 653, 84105 Beer-Sheva (Israel)

2013-07-01T23:59:59.000Z

299

Influence of the cosmological constant on gravitational lensing in small systems  

SciTech Connect (OSTI)

The cosmological constant {lambda} affects gravitational lensing phenomena. The contribution of {lambda} to the observable angular positions of multiple images and to their amplification and time delay is here computed through a study of the weak deflection limit of the equations of motion in the Schwarzschild-de Sitter metric. Because of {lambda} the unresolved images are slightly demagnified, the radius of the Einstein ring decreases, and the time delay increases. The effect is however negligible for near lenses. In the case of a null cosmological constant, we provide some updated results on lensing by a Schwarzschild black hole.

Sereno, Mauro [Institut fuer Theoretische Physik, Universitaet Zuerich, Winterthurerstrasse 190, CH-8057 Zurich (Switzerland)

2008-02-15T23:59:59.000Z

300

Influence of the cosmological constant on gravitational lensing in small systems  

Science Journals Connector (OSTI)

The cosmological constant ? affects gravitational lensing phenomena. The contribution of ? to the observable angular positions of multiple images and to their amplification and time delay is here computed through a study of the weak deflection limit of the equations of motion in the SchwarzschilddeSitter metric. Because of ? the unresolved images are slightly demagnified, the radius of the Einstein ring decreases, and the time delay increases. The effect is however negligible for near lenses. In the case of a null cosmological constant, we provide some updated results on lensing by a Schwarzschild black hole.

Mauro Sereno

2008-02-15T23:59:59.000Z

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


301

Low red-shift formula for the luminosity distance in a LTB model with cosmological constant  

E-Print Network [OSTI]

We calculate the low red-shift Taylor expansion for the luminosity distance for an observer at the center of a spherically symmetric matter inhomogeneity with a non vanishing cosmological constant. We then test the accuracy of the formulas comparing them to the numerical calculation for different cases for both the luminosity distance and the radial coordinate. The formulas can be used as a starting point to understand the general non linear effects of a local inhomogeneity in presence of a cosmological constant, without making any special assumption about the inhomogeneity profile.

Antonio Enea Romano; Pisin Chen

2014-05-08T23:59:59.000Z

302

Electronic constant current and current pulse signal generator for nuclear instrumentation testing  

DOE Patents [OSTI]

Circuitry is described for testing the ability of an intermediate range nuclear instrument to detect and measure a constant current and a periodic current pulse. The invention simulates the resistance and capacitance of the signal connection of a nuclear instrument ion chamber detector and interconnecting cable. An LED flasher/oscillator illuminates an LED at a periodic rate established by a timing capacitor and circuitry internal to the flasher/oscillator. When the LED is on, a periodic current pulse is applied to the instrument. When the LED is off, a constant current is applied. An inductor opposes battery current flow when the LED is on. 1 figures.

Brown, R.A.

1994-04-19T23:59:59.000Z

303

Is the zero-point energy a source of the cosmological constant?  

E-Print Network [OSTI]

We discuss how we remove a huge discrepancy between the theory of a cosmological constant, due to the zero-point energies of matter fields, and the observation. The technique of dimensional regularization plays a decisive role. We eventually reach the desired behavior of the vacuum densities falling off like t^{-2}, allowing us to understand how an extremely small result comes about naturally. As a price, however, the zero-point energy vacuum fails to act as a true cosmological constant. Its expected role responsible for the observed accelerating universe is then to be inherited by the gravitational scalar field, dark energy, as we suggest in the scalar-tensor theory.

Fujii, Yasunori

2014-01-01T23:59:59.000Z

304

Is the zero-point energy a source of the cosmological constant?  

E-Print Network [OSTI]

We discuss how we remove a huge discrepancy between the theory of a cosmological constant, due to the zero-point energies of matter fields, and the observation. The technique of dimensional regularization plays a decisive role. We eventually reach the desired behavior of the vacuum densities falling off like t^{-2}, allowing us to understand how an extremely small result comes about naturally. As a price, however, the zero-point energy vacuum fails to act as a true cosmological constant. Its expected role responsible for the observed accelerating universe is then to be inherited by the gravitational scalar field, dark energy, as we suggest in the scalar-tensor theory.

Yasunori Fujii

2014-03-15T23:59:59.000Z

305

Electronic constant current and current pulse signal generator for nuclear instrumentation testing  

DOE Patents [OSTI]

Circuitry for testing the ability of an intermediate range nuclear instrut to detect and measure a constant current and a periodic current pulse. The invention simulates the resistance and capacitance of the signal connection of a nuclear instrument ion chamber detector and interconnecting cable. An LED flasher/oscillator illuminates an LED at a periodic rate established by a timing capacitor and circuitry internal to the flasher/oscillator. When the LED is on, a periodic current pulse is applied to the instrument. When the LED is off, a constant current is applied. An inductor opposes battery current flow when the LED is on.

Brown, Roger A. (Amsterdam, NY)

1994-01-01T23:59:59.000Z

306

Superselection rule for the cosmological constant in three-dimensional spacetime  

E-Print Network [OSTI]

Efforts to understand the origin of the cosmological constant {\\Lambda} and its observed value have led to consider it as a dynamical field rather than as a universal constant. Then the possibility arises that the universe, or regions of it, might be in a superposition of quantum states with different values of {\\Lambda}, so that its actual value would not be definite. There appears to be no argument to rule out this possibility for a generic spacetime dimension D. However, as proved herein, for D=3 there exists a superselection rule that forbids such superpositions. The proof is based on the asymptotic symmetry algebra.

Bunster, Claudio

2014-01-01T23:59:59.000Z

307

Attributive types for proof erasure  

Science Journals Connector (OSTI)

Proof erasure plays an essential role in the paradigm of programming with theorem proving. In this paper, we introduce a form of attributive types that carry an attribute to determine whether expressions assigned such types are eligible for erasure before ...

Hongwei Xi

2007-05-01T23:59:59.000Z

308

Tornado type wind turbines  

DOE Patents [OSTI]

A tornado type wind turbine has a vertically disposed wind collecting tower with spaced apart inner and outer walls and a central bore. The upper end of the tower is open while the lower end of the structure is in communication with a wind intake chamber. An opening in the wind chamber is positioned over a turbine which is in driving communication with an electrical generator. An opening between the inner and outer walls at the lower end of the tower permits radially flowing air to enter the space between the inner and outer walls while a vertically disposed opening in the wind collecting tower permits tangentially flowing air to enter the central bore. A porous portion of the inner wall permits the radially flowing air to interact with the tangentially flowing air so as to create an intensified vortex flow which exits out of the top opening of the tower so as to create a low pressure core and thus draw air through the opening of the wind intake chamber so as to drive the turbine.

Hsu, Cheng-Ting (Ames, IA)

1984-01-01T23:59:59.000Z

309

The Formulation of Quantum Field Theory with no Renormalization of Masses and Coupling Constants of Fermions  

E-Print Network [OSTI]

The paper presents the formulation of quantum field theory without renormalization of masses and coupling constants of fermions. Counter-terms, compensating for divergent quantities in self-energy diagrams of fermions and vacuum polarization diagrams at all orders of the perturbation theory, appear in the appropriate Hamiltonians under the special time-dependent unitary transformation.

Neznamov, V P

2015-01-01T23:59:59.000Z

310

The B{sub s}B*K coupling constant using QCDSR  

SciTech Connect (OSTI)

In this work we evaluate the coupling constant for the vertex B{sub s}B*K by the QCD Sum Rules. The result was obtained using the heaviest particle off shell of this vertex, the B{sub s} meson, and the lightest particle off shell, the K meson.

Cerqueira, A. Jr.; Rodrigues, B. O. [Instituto de Fisica Armando Dias Tavares, Universidade do Estado do Rio de Janeiro, Rua Sao Francisco Xavier 524, 20559-900, Rio de Janeiro, RJ (Brazil); Bracco, M. E. [Faculdade de Tecnologia, DMFC, Universidade do Estado do Rio de Janeiro, Rod. Presidente Dutra km 298, 27537-000, Resende, RJ (Brazil)

2013-03-25T23:59:59.000Z

311

A QCDSR calculation for the {phi}D{sub s}D{sub s} coupling constant  

SciTech Connect (OSTI)

In this work, we use the QCD Sum Rules (QCDSR) technique to obtain informations about the strong coupling constant of the three meson vertex {phi}D{sub s}D{sub s}. The calculation is done for the case where the {phi} meson is considered off-shell.

Rodrigues, B. O.; Chiapparini, M. [Instituto de Fisica, Universidade do Estado do Rio de Janeiro, Rua Sao Francisco Xavier 524, 20550-900 Rio de Janeiro, RJ (Brazil); Bracco, M. E. [Faculdade de Tecnologia, Universidade do Estado do Rio de Janeiro, Rod. Presidente Dutra Km 298, Polo Industrial, 27537-000 , Resende, RJ (Brazil)

2013-03-25T23:59:59.000Z

312

The Partially Stopped Leaky Bucket: An Efficient Traffic Regulator with Constant  

E-Print Network [OSTI]

1 The Partially Stopped Leaky Bucket: An Efficient Traffic Regulator with Constant Time Implementation Florin Ciucu, Brian L. Mark , and Robert Simon Lab. of Cooperative Work Environment Dept. of Computer Science Dept. of Electrical and Computer Engineering School of Information Technology

Ciucu, Florin

313

The hillslope-storage Boussinesq model for non-constant bedrock slope  

E-Print Network [OSTI]

The hillslope-storage Boussinesq model for non-constant bedrock slope A.G.J. Hilbertsa,*, E.E. van hillslope-storage Boussinesq (hsB) model is cast in a generalized formulation enabling the model to handle flow; Boussinesq equation; Richards equation; Kinematic wave equation 1. Introduction Landscape

Loon, E. Emiel van

314

Channel Specific Rate Constants Relevant to the Thermal Decomposition of Disilane  

Science Journals Connector (OSTI)

Channel Specific Rate Constants Relevant to the Thermal Decomposition of Disilane ... Silane and disilane are routinely used as the source gases for silicon chemical vapor deposition (CVD) processes. ... Each of the reactions relevant to the thermal decomposition of disilane is, of course, pressure dependent. ...

Keiji Matsumoto; Stephen J. Klippenstein; Kenichi Tonokura; Mitsuo Koshi

2005-05-14T23:59:59.000Z

315

THE BEST SOBOLEV TRACE CONSTANT IN DOMAINS WITH HOLES FOR CRITICAL OR SUBCRITICAL EXPONENTS  

E-Print Network [OSTI]

THE BEST SOBOLEV TRACE CONSTANT IN DOMAINS WITH HOLES FOR CRITICAL OR SUBCRITICAL EXPONENTS JULI in the Sobolev trace embedding H1() Lq() in a bounded smooth domain for critical or subcritical q, that is 1 embedding H1 () Lq () for critical or subcritical exponents, 1

Rossi, Julio D.

316

Viscosity and elastic constants of amorphous Si and Ge Ann Witwow@ and Frans Spaepen  

E-Print Network [OSTI]

Viscosity and elastic constants of amorphous Si and Ge Ann Witwow@ and Frans Spaepen Division expansion. Viscous flow was measured by stress relaxation and was found to be Newtonian. The viscosity of the viscosity of sputter-deposited samples as a function of stress (to establish the Newtonian charac- ter

Spaepen, Frans A.

317

Equilibria for Economies with Production: Constant-Returns Technologies and Production Planning Constraints  

E-Print Network [OSTI]

can produce a bundle of goods out of many possibilities e.g., a dairy can either produce ice- creams, each producer has a convex, constant-returns- to-scale, technology. In particular, this means that it is not possible to produce something from nothing. At a given price, the producer picks a technologically feasible

Varadarajan, Kasturi R.

318

Fretting Corrosion Damage of Total Hip Prosthesis: Friction Coefficient and Damage Rate Constant Approach  

E-Print Network [OSTI]

1 Fretting Corrosion Damage of Total Hip Prosthesis: Friction Coefficient and Damage Rate Constant Building, University Park 16802 PA USA 4 Chair Professor Center for Research Excellence in Corrosion hip prosthesis. Fretting corrosion tests were conducted with stainless steel and poly (methyl

Boyer, Edmond

319

The watt balance: determination of the Planck constant and redefinition of the kilogram  

Science Journals Connector (OSTI)

...aspect is that the future definition can...fundamental constant of quantum physics, which...example an electric motor lifting a mass...feasibility study for a future cryogenic experiment...electrostatic motor which is part...and for the future realization of...two macroscopic quantum effects, thus...

2011-01-01T23:59:59.000Z

320

Generalized methods and solvers for noise removal from piecewise constant signals. II. New methods  

Science Journals Connector (OSTI)

...piecewise constant signals. II. New methods Max A. Little 1 2 * Nick S. Jones 1 3 * Author for correspondence ( max.little@physics...existing methods, leading to new methods that have their own merit as PWC denoising methods. To recap, the notation used in part...

2011-01-01T23:59:59.000Z

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


321

Performance Analysis of a New Ultrasound Axial Strain Time Constant Estimation  

E-Print Network [OSTI]

elastographic time constant (TC) estimator, which is based on the use of the Least Square Error (LSE) curve-fitting method and the Levenberg-Marquardt (LM) optimization rule as applied to noisy elastographic data obtained from a tissue under creep compression...

Nair, Sanjay P.

2011-08-08T23:59:59.000Z

322

Bonding in Sodium Chloride Nanotubes: A New Analysis via Madelung Constants and Cohesive Energies  

E-Print Network [OSTI]

1 Bonding in Sodium Chloride Nanotubes: A New Analysis via Madelung Constants and Cohesive Energies is introduced which employs a linear relationship between nanotube cohesive energies determined via Density between ionic and cohesive bonding energies indicate that, as the nanotubes become longer, ionic bonding

Hanusa, Christopher

323

Photon emission in a constant magnetic field in 2+1 dimensional space-time  

E-Print Network [OSTI]

We calculate by the proper-time method the amplitude of the two-photon emission by a charged fermion in a constant magnetic field in (2+1)-dimensional space-time. The relevant dynamics reduces to that of a supesymmetric quantum-mechanical system with one bosonic and one fermionic degrees of freedom.

J. T. S. Amaral; S. I. Zlatev

2005-11-01T23:59:59.000Z

324

ur solid Earth undergoes constant change from motions within its core  

E-Print Network [OSTI]

O ur solid Earth undergoes constant change from motions within its core to the surface. Solid Earth is the physical planet we live on, not the oceans or atmosphere. Motions near Earth's cen- ter affect the geodynamo, which generates the Earth's magnetic field. Convection within Earth's mantle drives plate

McLeod, Dennis

325

Impact of thermal strain on the dielectric constant of sputtered barium strontium titanate thin films  

E-Print Network [OSTI]

Impact of thermal strain on the dielectric constant of sputtered barium strontium titanate thin, California 93106 Received 6 November 2001; accepted for publication 10 January 2002 Barium strontium titanate: magnesium oxide, strontium titanate, sapphire, silicon, and vycor glass. These substrates were chosen

York, Robert A.

326

Calibration of the torsional spring constant and the lateral photodiode response of frictional force microscopes  

E-Print Network [OSTI]

Calibration of the torsional spring constant and the lateral photodiode response of frictional simultaneously calibrates the photodiode response to the angular deflection of the cantilever. It does not rely steps: the calibration of the lateral photodiode response to convert the measured volts to the angle

Attard, Phil

327

The precession constant of the Earth: Variations through the ice-age  

SciTech Connect (OSTI)

We directly calculate the history of variations in Earth`s precession constant H that are forced by variations in surface mass associated with late Pleistocene ice-age glaciation and deglaciation events. Our analyses show that the magnitude of Delta H/H(sub zero) is lower than that required to cause the recently hypothesized resonant reduction of the precession period.

Peltier, W.R.; Jiang, X. [Univ. of Toronto, Ontario (Canada)] [Univ. of Toronto, Ontario (Canada)

1994-10-01T23:59:59.000Z

328

Jet Measurements and Extraction of the Strong Coupling Constant at HERA  

E-Print Network [OSTI]

Results on jet measurements in neutral current deep inelastic scattering at HERA are presented. The low-$x_{Bj}$ and low-$Q^2$ region is explicitly investigated using forward jet production and the azimuthal asymmetry between jets in dijet production. Recent results on the determination of the strong coupling constant, $\\alpha_s(M_Z)$, are discussed.

A. A. Savin

2005-05-22T23:59:59.000Z

329

Boundary problems for one-dimensional kinetic equation with constant collision frequency  

E-Print Network [OSTI]

For the one-dimensional linear kinetic equation analytical solutions of problems about temperature jump and weak evaporation (condensation) over flat surface are received. The equation has integral of collisions BGK (Bhatnagar, Gross and Krook) and constant frequency of collisions of molecules. Distribution of concentration, mass speed and temperature is received.

A. L. Bugrimov; A. V. Latyshev; A. A. Yushkanov

2014-04-17T23:59:59.000Z

330

Waves of constant shape and the structure of the \\rotors boundary" in excitable media.  

E-Print Network [OSTI]

Waves of constant shape and the structure of the \\rotors boundary" in excitable media. Yu.E. Elkin wave patterns in R 2 , in terms of the kinematic approach. These patterns include rotating waves (diverging and converging spiral waves), and translating waves (retracting waves, \\critical #12;ngers" and \\V

Biktashev, Vadim N.

331

CODATA recommended values of the fundamental physical constants: Peter J. Mohr,  

E-Print Network [OSTI]

constants and conversion factors of physics and chemistry recommended by the Committee on Data for Science c. Nuclear polarization 640 d. Self energy 640 e. Vacuum polarization 641 f. Two-photon corrections energy and vacuum polarization 645 j. Radiative-recoil corrections 645 k. Nucleus self energy 645 l

332

Temperature dependent elastic constants and ultimate strength of graphene and graphyne  

E-Print Network [OSTI]

Temperature dependent elastic constants and ultimate strength of graphene and graphyne Tianjiao strength of graphene and graphyne Tianjiao Shao,1,2 Bin Wen,1,a) Roderick Melnik,3,4 Shan Yao,2 Yoshiyuki strength of graphene and graphyne. For the linear thermal expan- sion coefficient, both graphene

Melnik, Roderick

333

Chemical reactor models of optimal digestion efficiency with constant foraging costs  

E-Print Network [OSTI]

Chemical reactor models of optimal digestion efficiency with constant foraging costs J. David Logan-batch reactor or plug flow reactor. Specifically, we determine the residence time that optimizes the average net , Anthony Joern , & William Wolesensky January 24, 2003 Abstract We develop quantitative optimization

Logan, David

334

Spare change? Today's business leaders have to work in a constantly shifting landscape. The challenge  

E-Print Network [OSTI]

Spare change? Today's business leaders have to work in a constantly shifting landscape. According to Climate change: Everyone's business, a report from the CBI Climate Change Task Force published. The challenge is to turn change management into an opportunity, not a cost centre, writes Oliver Cann

335

Accurate laboratory ultraviolet wavelengths for quasar absorption-line constraints on varying fundamental constants  

Science Journals Connector (OSTI)

......improvement in the quality and quantity of...invested into improving the laboratory...reducing the noise, solar-blind photomultipliers...2000-a, where air absorbs most light...constants for the energy levels included...dispersion formula for air at 15C and atmospheric......

M. Aldenius; S. Johansson; M. T. Murphy

2006-07-21T23:59:59.000Z

336

Absorption line shape recovery beyond the detection bandwidth limit: application to the Boltzmann constant determination  

E-Print Network [OSTI]

1 Absorption line shape recovery beyond the detection bandwidth limit: application to the Boltzmann of the influence of detection bandwidth properties on observed line shapes in laser absorption spectroscopy the Boltzmann constant (kB) [10, 11]. Based upon laser absorption spectroscopy in the linear regime

337

Estimation of surface precipitation constants for sorption of divalent metals onto hydrous ferric oxide and calcite  

E-Print Network [OSTI]

+ , Mg2+ , Ca2+ , Mn2+ , Co2+ , Ni2+ , Sr2+ , Sn2+ , Ba2+ , Eu2+ , Ra2+ , Pb2+ , Hg2+ , Cu2+ , and UO2 2 estimation of free energies and, hence, equilibrium constants of the surface precipitation reactions for Be2

Polly, David

338

IEEE POWER ELECTRONICS LETTERS 1 A Constant-Frequency Method for Improving  

E-Print Network [OSTI]

these are resonant gate drive [3]­[5], pulse frequency modulation (PFM) [6], and a hybrid Manuscript received, in the case of the variable-frequency methods, their potential for generating undesired noise at subharmonicsIEEE POWER ELECTRONICS LETTERS 1 A Constant-Frequency Method for Improving Light-Load Efficiency

Lee, Thomas H.

339

A Design Methodology for Link Adaptation Schemes using Constellations of Constant PAPR  

E-Print Network [OSTI]

communication systems requires the inclusion of circuit energy consumption in the system's total energy budget in the total energy budget, in which a set of signal constellations of constant peak-to-average power ratio are then applied to a design example. I. INTRODUCTION Including circuit energy consumption in the global energy

?ien, Geir E.

340

Cosmic strings in a spacetime with positive cosmological constant  

Science Journals Connector (OSTI)

We study Abelian strings in a fixed de Sitter background. We find that the gauge and Higgs fields extend smoothly across the cosmological horizon and that the string solutions have oscillating scalar fields outside the cosmological horizon for all currently accepted values of the cosmological constant. If the gauge to Higgs boson mass ratio is small enough, the gauge field function has a power-like behaviour, while it is oscillating outside the cosmological horizon if Higgs and gauge boson mass are comparable. Moreover, we observe that Abelian strings exist only up to a maximal value of the cosmological constant and that two branches of solutions exist that meet at this maximal value. We also construct radially excited solutions that only exist for non-vanishing values of the cosmological constant and are thus a novel feature as compared to flat spacetime. Considering the effect of the de Sitter string on the spacetime, we observe that the deficit angle increases with increasing cosmological constant. Lensed objects would thus be separated by a larger angle as compared to asymptotically flat spacetime.

Yves Brihaye; Betti Hartmann

2008-01-01T23:59:59.000Z

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


341

Cosmic strings in a space-time with positive cosmological constant  

E-Print Network [OSTI]

We study Abelian strings in a fixed de Sitter background. We find that the gauge and Higgs fields extend smoothly across the cosmological horizon and that the string solutions have oscillating scalar fields outside the cosmological horizon for all currently accepted values of the cosmological constant. If the gauge to Higgs boson mass ratio is small enough, the gauge field function has a power-like behaviour, while it is oscillating outside the cosmological horizon if Higgs and gauge boson mass are comparable. Moreover, we observe that Abelian strings exist only up to a maximal value of the cosmological constant and that two branches of solutions exist that meet at this maximal value. We also construct radially excited solutions that only exist for non-vanishing values of the cosmological constant and are thus a novel feature as compared to flat space-time. Considering the effect of the de Sitter string on the space-time, we observe that the deficit angle increases with increasing cosmological constant. Lensed objects would thus be separated by a larger angle as compared to asymptotically flat space-time.

Yves Brihaye; Betti Hartmann

2008-06-03T23:59:59.000Z

342

Rate constants for OH with selected large alkanes : shock-tube measurements and an improved group scheme.  

SciTech Connect (OSTI)

High-temperature rate constant experiments on OH with the five large (C{sub 5}-C{sub 8}) saturated hydrocarbons n-heptane, 2,2,3,3-tetramethylbutane (2,2,3,3-TMB), n-pentane, n-hexane, and 2,3-dimethylbutane (2,3-DMB) were performed with the reflected-shock-tube technique using multipass absorption spectrometric detection of OH radicals at 308 nm. Single-point determinations at {approx}1200 K on n-heptane, 2,2,3,3-TMB, n-hexane, and 2,3-DMB were previously reported by Cohen and co-workers; however, the present work substantially extends the database to both lower and higher temperature. The present experiments span a wide temperature range, 789-1308 K, and represent the first direct measurements of rate constants at T > 800 K for n-pentane. The present work utilized 48 optical passes corresponding to a total path length of {approx}4.2 m. As a result of this increased path length, the high OH concentration detection sensitivity permitted pseudo-first-order analyses for unambiguously measuring rate constants. The experimental results can be expressed in Arrhenius form in units of cm{sup 3} molecule{sup -1} s{sup -1} as follows: K{sub OH+n-heptane} = (2.48 {+-} 0.17) x 10{sup -10} exp[(-1927 {+-} 69 K)/T] (838-1287 K); k{sub OH+2,2,3,3-TMB} = (8.26 {+-} 0.89) x 10{sup -11} exp[(-1337 {+-} 94 K)/T] (789-1061 K); K{sub OH+n-pentane} = (1.60 {+-} 0.25) x 10{sup -10} exp[(-1903 {+-} 146 K)/T] (823-1308 K); K{sub OH+n-hexane} = (2.79 {+-} 0.39) x 10{sup -10} exp[(-2301 {+-} 134 K)/T] (798-1299 K); and k{sub OH+2,3-DMB} = (1.27 {+-} 0.16) x 10{sup -10} exp[(-1617 {+-} 118 K)/T] (843-1292 K). The available experimental data, along with lower-T determinations, were used to obtain evaluations of the experimental rate constants over the temperature range from {approx}230 to 1300 K for most of the title reactions. These extended-temperature-range evaluations, given as three-parameter fits, are as follows: k{sub OH+n-heptane} = 2.059 x 10{sup -5}T{sup 1.401} exp(33 K/T) cm{sup 3} molecule{sup -1} s{sup -1} (241-1287 K); k{sub OH+2,2,3,3-TMB} = 6.835 x 10{sup -17}T{sup 1.886} exp(-365 K/T) cm{sup 3} molecule{sup -1} s{sup -1} (290-1180 K); k{sub OH+n-pentane} = 2.495 x 10{sup -16}T{sup 1.649} exp(80 K/T) cm{sup 3} molecule{sup -1} s{sup -1} (224-1308 K); k{sub OH+n-hexane} = 3.959 x 10{sup -18}T{sup 2.218} exp(443 K/T) cm{sup 3} molecule{sup -1} s{sup -1} (292-1299 K); and k{sub OH+2,3-DMB} = 2.287 x 10{sup -17}T{sup 1.958} exp(365 K/T) cm{sup 3} molecule{sup -1} s{sup -1} (220-1292 K). The experimental data and the evaluations obtained for these five larger alkanes in the present work were used along with prior data/evaluations obtained in this laboratory for H abstractions by OH from a series of smaller alkanes (C{sub 3}?C{sub 5}) to devise rate rules for abstractions from various types of primary, secondary, and tertiary H atoms. Specifically, the current scheme was applied with good success to H abstractions by OH from a series of n-alkanes (n-octane through n-hexadecane). The total rate constants using this group scheme for reactions of OH with selected large alkanes are given as three-parameter fits in this article. The rate constants for the various abstraction channels in any large n-alkane can also be obtained using the groups listed in this article. The present group scheme serves to reduce the uncertainties in rate constants for OH + alkane reactions.

Sivaramakrishnan, R.; Michael, J. V.; Chemical Sciences and Engineering Division

2009-04-30T23:59:59.000Z

343

Shock tube measurements of high temperature rate constants for OH with cycloalkanes and methylcycloalkanes  

SciTech Connect (OSTI)

High temperature experiments were performed with the reflected shock tube technique using multi-pass absorption spectrometric detection of OH radicals at 308 nm. The present experiments span a wide T-range, 801-1347 K, and represent the first direct measurements of the title rate constants at T>500 K for cyclopentane and cyclohexane and the only high temperature measurements for the corresponding methyl derivatives. The present work utilized 48 optical passes corresponding to a total path length {proportional_to}4.2 m. As a result of this increased path length, the high [OH] detection sensitivity permitted unambiguous analyses for measuring the title rate constants. The experimental rate constants in units, cm{sup 3} molecule{sup -1} s{sup -1}, can be expressed in Arrhenius form as k{sub OH+Cyclopentane}=(1.90{+-}0.30) x 10{sup -10}exp(-1705{+-}56 K/T) (813-1341 K), k{sub OH+Cyclohexane}=(1.86{+-}0.24) x 10{sup -10}exp(-1513{+-}123 K/T) (801-1347 K), k{sub OH+Methylcyclopentane}=(2.02{+-}0.19) x 10{sup -10}exp(-1799{+-}96 K/T) (859-1344 K), k{sub OH+Methylcyclohexane}=(2.55{+-}0.30) x 10{sup -10}exp(-1824{+-}114 K/T) (836-1273 K). These results and lower-T experimental data were used to obtain three parameter evaluations of the experimental rate constants for the title reactions over an even wider T-range. These experimental three parameter fits to the rate constants in units, cm{sup 3} molecule{sup -1} s{sup -1}, are k{sub OH+Cyclopentane}=1.390 x 10{sup -16}T{sup 1.779}exp(97 K/T)cm{sup 3} molecule{sup -1}s{sup -1} (209-1341 K), k{sub OH+Cyclohexane}=3.169 x 10{sup -16}T{sup 1.679}exp(119 K/T)cm{sup 3}molecule{sup -1}s{sup -1} (225-1347 K), k{sub OH+Methylcyclopentane}=6.903 x 10{sup -18}T{sup 2.148}exp(536 K/T)cm{sup 3}molecule{sup -1}s{sup -1} (296-1344 K), k{sub OH+Methylcyclohexane}=2.341 x 10{sup -18}T{sup 2.325}exp(602 K/T)cm{sup 3}molecule{sup -1}s{sup -1} (296-1273 K). High level electronic structure methods were used to characterize the first three reactions in order to provide reliable extrapolations of the rate constants from 250-2000 K. The results of the theoretical predictions for OH + cyclohexane and OH + methylcyclopentane were sufficient to make a theoretical prediction for OH + methylcyclohexane. The present recommended rate expressions for OH with cyclohexane, and methylcyclohexane, give rate constants that are 15-25% higher (over the T-range 800-1300 K) than the rate constants utilized in recent modeling efforts aimed at addressing the oxidation of cyclohexane and methylcyclohexane. The current measurements reduce the uncertainties in rate constants for the primary cycloalkane consumption channel in a high temperature oxidation environment. (author)

Sivaramakrishnan, R.; Michael, J.V. [Chemical Sciences and Engineering Division, D-193, Bldg. 200, Argonne National Laboratory, Argonne, IL 60439 (United States)

2009-05-15T23:59:59.000Z

344

On the asymptotic homotopy type of inductive limit Type ...  

E-Print Network [OSTI]

In this note we exhibit large classes of (projeetionless) stable, nuclear C*- algebras whose asymptotic homotopy type is determined by K-theoretical data.

345

Infrared Spectra and Optical Constants of Astronomical Ices: II. Ethane and Ethylene  

E-Print Network [OSTI]

Infrared spectroscopic observations have established the presence of hydrocarbon ices on Pluto and other TNOs, but the abundances of such molecules cannot be deduced without accurate optical constants (n, k) and reference spectra. In this paper we present our recent measurements of near- and mid-infrared optical constants for ethane (C$_2$H$_6$) and ethylene (C$_2$H$_4$) in multiple ice phases and at multiple temperatures. As in our recent work on acetylene (C$_2$H$_2$), we also report new measurements of the index of refraction of each ice at 670 nm. Comparisons are made to earlier work where possible, and electronic versions of our new results are made available.

Hudson, R L; Moore, M H

2015-01-01T23:59:59.000Z

346

Phenomenology of Gravitational Aether as a solution to the Old Cosmological Constant Problem  

E-Print Network [OSTI]

One of the deepest and most long-standing mysteries in physics has been the huge discrepancy between the observed vacuum density and our expectations from theories of high energy physics, which has been dubbed the Old Cosmological Constant problem. One proposal to address this puzzle at the semi-classical level is to decouple quantum vacuum from space-time geometry via a modification of gravity that includes an incompressible fluid, known as Gravitational Aether. In this paper, we discuss classical predictions of this theory along with its compatibility with cosmological and experimental tests of gravity. We argue that deviations from General Relativity (GR) in this theory are sourced by pressure or vorticity. In particular, the theory predicts that the gravitational constant for radiation is 33% larger than that of non-relativistic matter, which is preferred by (most) cosmic microwave background (CMB), Lyman-Alpha forest, and Lithium-7 primordial abundance observations, while being consistent with other cosm...

Aslanbeigi, Siavash; Foster, Brendan Z; Kohri, Kazunori; Afshordi, Niayesh

2011-01-01T23:59:59.000Z

347

Dielectric constant of He3 near the liquid-vapor critical point  

Science Journals Connector (OSTI)

High-resolution measurements of the static dielectric constant ? along the critical isochoe are reported for He3 in the region of the critical point. The experiments were conducted at a frequency of 1000 Hz and the purpose was to observe a divergence of (???T)?c as Tc is approached from above. No evidence for a critical anomaly was found, the estimated upper bound for its integrated value being ???410-8 which is consistent with the theoretical estimations. Hence, the recently reported enhancement in ?? for SF6 over that predicted by theory is not observed in He3. In the Appendix, some experimental questions arising in such constant-density experiments are discussed.

Ted Doiron and Horst Meyer

1978-03-01T23:59:59.000Z

348

The Oklo Natural Reactor and the Time Variability of the Fundamental Constants of Nature  

SciTech Connect (OSTI)

Natural nuclear reactors? Changes in the speed of light? If either of these concepts seem implausible to you now they certainly won't once Dr. Steve Lamoreaux (LANL) delivers his SLAC Colloquium lecture in the Panofsky Auditorium on November 7th at 4:15 pm entitled The Oklo Natural Reactor and the Time Variability of the Fundamental Constants of Nature. This lecture is a rare opportunity to learn not only about Oklo's incredible natural nuclear reactors but also to gain understanding about how the present-day study of these sites may alter our understanding of fundamental constants such as the speed of light. This event is a must-see for the curious!

Lamoreaux, Steve (LANL) [LANL

2005-11-07T23:59:59.000Z

349

Analog simulations of josephson junction in a microwave field. Devil's staircase, fractal dimension, and decay constants  

SciTech Connect (OSTI)

The RSJ model of the Josephson junction in the presence of a microwave field is studied using an analog computer, with special attention to the behavior of this system near or at the critical line, where the set of substeps forms a complete devil's staircase on the I-V characteristic. A value of fractal dimension D = 0.868 +/- 0.002 is determined from 240 substeps between the winding numbers W = 0 and W = 1. Four values of decay constants are determined. The results agree very well with the prediction obtained from the one-dimensional circle map. A self-similarity graph is shown confirming that the staircase is very near the critical line. Results confirm the universal and global character of D and decay constants on the critical line, as was suggested by Jensen et al.

Kuznik, V.; Odehnal, M.

1986-12-01T23:59:59.000Z

350

Quantum adiabatic computation with a constant gap is not useful in one dimension  

SciTech Connect (OSTI)

We show that it is possible to use a classical computer to efficiently simulate the adiabatic evolution of a quantum system in one dimension with a constant spectral gap, starting the adiabatic evolution from a known initial product state. The proof relies on a recently proven area law for such systems, implying the existence of a good matrix product representation of the ground state, combined with an appropriate algorithm to update the matrix product state as the Hamiltonian is changed. This implies that adiabatic evolution with such Hamiltonians is not useful for universal quantum computation. Therefore, adiabatic algorithms which are useful for universal quantum computation either require a spectral gap tending to zero or need to be implemented in more than one dimension (we leave open the question of the computational power of adiabatic simulation with a constant gap in more than one dimension).

Hastings, Matthew [Los Alamos National Laboratory

2009-01-01T23:59:59.000Z

351

Prediction for the Cosmological Constant in Resummed Quantum Gravity and Constraints on SUSY GUT's  

E-Print Network [OSTI]

We use our resummed quantum gravity approach to Einstein's general theory of relativity in the context of the Planck scale cosmology formulation of Bonanno and Reuter to estimate the value of the cosmological constant such that \\rho_\\Lambda=(0.0024 eV)^4. We argue that the closeness of this estimate to experiment constrains susy GUT models. We discuss in turn various theoretical issues that have been raised about the approach itself as well as about the application to estimate the cosmological constant. Given the closeness of the estimate to the currently observed value, we also discuss the theoretical uncertainty in the estimate -- at this time, we argue it is still large.

B. F. L. Ward

2015-01-05T23:59:59.000Z

352

Window Types | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Window Types Window Types Window Types June 18, 2012 - 8:06am Addthis A wood-frame window with insulated window glazing. | Photo courtesy of ©iStockphoto/chandlerphoto A wood-frame window with insulated window glazing. | Photo courtesy of ©iStockphoto/chandlerphoto What does this mean for me? If you have old windows, they are likely losing large amounts of energy through the frames and glazing. By upgrading old windows, you can reduce heating and cooling costs in your home. Windows come in a number of different frame and glazing types. By combining an energy-efficient frame choice with a glazing type tailored to your climate and application, you can customize each of your home's windows. Types of Window Frames Improving the thermal resistance of the frame can contribute to a window's

353

Window Types | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Window Types Window Types Window Types June 18, 2012 - 8:06am Addthis A wood-frame window with insulated window glazing. | Photo courtesy of ©iStockphoto/chandlerphoto A wood-frame window with insulated window glazing. | Photo courtesy of ©iStockphoto/chandlerphoto What does this mean for me? If you have old windows, they are likely losing large amounts of energy through the frames and glazing. By upgrading old windows, you can reduce heating and cooling costs in your home. Windows come in a number of different frame and glazing types. By combining an energy-efficient frame choice with a glazing type tailored to your climate and application, you can customize each of your home's windows. Types of Window Frames Improving the thermal resistance of the frame can contribute to a window's

354

Boundary integral method for quantum billiards in a constant magnetic field  

Science Journals Connector (OSTI)

We derive a boundary integral equation to compute the eigenvalues of two-dimensional billiards subjected to a magnetic field. The integral requires the Green's function of the boundary-free problem with the magnetic field pointing in the opposite direction. This Green's function is computed for the case of a constant magnetic field perpendicular to the billiard and some applications are discussed. The elliptical billiard is then studied numerically as an example of a nontrivial application.

M. L. Tiago; T. O. de Carvalho; M. A. M. de Aguiar

1997-01-01T23:59:59.000Z

355

Broken gauge symmetry in a Bose gas with constant particle number  

E-Print Network [OSTI]

The existence of broken gauge symmetries in Bose-Einstein condensates is still controversially discussed in science, since it would not conserve the total number of particles. Here, it is shown for the first time that non-random condensate and non-condensate phase distributions may arise from local particle number breaking in a Bose gas with constant particle number, while the global U(1)-gauge symmetry of the system is preserved due to particle number conservation.

Alexej Schelle

2014-12-13T23:59:59.000Z

356

The decay constants f(B+) and f(D+) from three-flavor lattice QCD  

SciTech Connect (OSTI)

We present new results for f{sub B+} and f{sub D+} from the MILC 2+1 flavor a = 0.09fm 'fine' lattice. We use clover heavy quarks in the Fermilab interpretation and improved staggered light quarks. Lattice results from partially quenched QCD fix the parameters of staggered chiral perturbation theory which is used in the extrapolation to the physical decay constants.

Bernard, C.; /Washington U., St. Louis; DeTar, Carleton; Levkova, L.; /Utah U.; Di Pierro, Massimo; /DePaul U.; El-Khadra, Aida Xenia; Evans, R.T.; Jain, R.; /Illinois U., Urbana; Freeland, Elizabeth Dawn; /Art Inst. of Chicago; Gottlieb, Steven A.; /Indiana U.; Heller, Urs M.; /APS, New York; Hetrick, James E.; /U. Pacific, Stockton /Fermilab /Simon Fraser U. /Arizona U. /UC, Santa Barbara

2006-01-01T23:59:59.000Z

357

The theory of Multiverse, multiplicity of physical objects and physical constants  

E-Print Network [OSTI]

The Multiverse is collection of parallel universes. In this article a formal theory and a topos-theoretic models of the multiverse are given. For this the Lawvere-Kock Synthetic Differential Geometry and topos models for smooth infinitesimal analysis are used. Physical properties of multi-variant and many-dimensional parallel universes are discussed. The source of multiplicity of physical objects is set of physical constants.

Gouts, A K

2003-01-01T23:59:59.000Z

358

A Precision Comparison of Calculated and Observed Grating Constants of Crystals  

Science Journals Connector (OSTI)

A precision comparison of the calculated and observed grating constants of calcite, rocksalt, artificial KCl, and diamond crystals is made with calcite as standard. The calculated values are determined from density measurements, while the observed values are calculated from the angles of reflection for the Mo K?1 line obtained by means of a precision double-crystal spectrometer. The value of ? obtained from the calculated grating constant of calcite is used to determine the observed grating constants of the other crystals. The density of rocksalt and KCl is measured by immersion in Russian mineral oil whose density and change of density with temperature was found to be 0.88011 at 24C. and 0.000064 per 0.1 respectively. The density of diamond is determined by weighing a solution of thallous formate and thallous malonate, in which the diamond just floats, in a calibrated specific gravity bottle of approximately 50 cc capacity. Two methods are used in the x-ray measurements, namely, the calcite method, de scribed by A. H. Compton and S. K. Allison and J. H. Williams, and the rocksalt method. The latter consists of measuring the peak position of the beam reflected from crystal B by swinging the ionization chamber past the beam, with two narrow slits between it and the crystal, ranging in width from 0.04 to 0.08 mm and separated by a distance of 18 cm. Calculated and observed values of the grating constants of these crystals are found to agree within experimental error, ranging from 0.004 to 0.011 percent, showing no evidence of Zwicky's "secondary structure," which he offered as a possible explanation of the discrepancy between x-ray wave-lengths obtained by the crystal method and those by the ruled grating method. Measurements on two quartz crystals showed a decided variation in the internal structure of the crystal, and indicate that quartz is unsuitable for precise wave-length measurements.

Yuching Tu

1932-06-01T23:59:59.000Z

359

Black holes and Boyle's law -- the thermodynamics of the cosmological constant  

E-Print Network [OSTI]

When the cosmological constant, $\\Lambda$, is interpreted as a thermodynamic variable in the study of black hole thermodynamics a very rich structure emerges. It is natural to interpret $\\Lambda$ as a pressure and define the thermodynamically conjugate variable to be the thermodynamic volume of the black hole (which need not bear any relation to the geometric volume). Recent progress in this new direction for black hole thermodynamics is reviewed.

Dolan, Brian P

2014-01-01T23:59:59.000Z

360

Reducing Building Energy Costs Using Optimized Operation Strategies for Constant Volume Air Handling Systems  

E-Print Network [OSTI]

SDCVP 67.380 $153.200 $41.800 $195.000 $2.89 measured energy consumption for each building. The horizontal axis is the ambient temperature. The venical axis is the average daily energy consumption in MMBtulhr. Figure 5 compares the predicted...REDUCING BUILDING ENERGY COSTS USING OPTIMIZED OPERATION STRATEGIES FOR CONSTANT VOLUME AIR HANDLING SYSTEMS Mingsheng Liu, her Atha, Agarni Reddy Ed White David Claridge and Jeff Haberl Department of Physical Plant Texas A&M University...

Liu, M.; Athar, A.; Reddy, A.; Claridge, D. E.; Haberl, J. S.; White, E.

1994-01-01T23:59:59.000Z

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


361

Exact solution to the Landau-Lifshitz equation in a constant electromagnetic field  

E-Print Network [OSTI]

We are interested in the motion of a classical charge acted upon an external constant electromagnetic field where the back reaction of the particle's own field is taken into account. The Landau-Lifshitz approximation to the Lorentz-Abraham-Dirac equation is solved exactly and in closed form. It is shown that the ultrarelativistic limit of the Landau-Lifshitz equation for a radiating charge is the equation for eigenvalues and eigenvectors of the external electromagnetic field tensor.

Yurij Yaremko

2014-12-04T23:59:59.000Z

362

Resummed Quantum Gravity Prediction for the Cosmological Constant and Constraints on SUSY GUTS  

E-Print Network [OSTI]

We use our resummed quantum gravity approach to Einstein's general theory of relativity in the context of the Planck scale cosmology formulation of Bonanno and Reuter to estimate the value of the cosmological constant as \\rho_\\Lambda =(0.0024 eV)^4. We show that the closeness of this estimate to experiment constrains susy GUT models. We also address various consistency checks on the calculation.

B. F. L. Ward

2014-09-04T23:59:59.000Z

363

Resummed Quantum Gravity Prediction for the Cosmological Constant and Constraints on SUSY GUTS  

E-Print Network [OSTI]

We use our resummed quantum gravity approach to Einstein's general theory of relativity in the context of the Planck scale cosmology formulation of Bonanno and Reuter to estimate the value of the cosmological constant as \\rho_\\Lambda =(0.0024 eV)^4. We show that the closeness of this estimate to experiment constrains susy GUT models. We also address various consistency checks on the calculation.

Ward, B F L

2014-01-01T23:59:59.000Z

364

A Model of Varying Fine Structure Constant and Varying Speed of Light  

E-Print Network [OSTI]

The recent evidence for a cosmological evolution of the fine structure constant \\alpha=e^2/\\hbar c found from an analysis of absorption systems in the spectra of distant quasars, is modelled by a cosmological scenario in which it is assumed that only the speed of light varies. The model fits the spectral line data and can also lead to a solution of the initial value problems in cosmology.

J. W. Moffat

2001-09-20T23:59:59.000Z

365

Polyhomogeneity and zero-rest-mass fields with applications to Newman-Penrose constants  

E-Print Network [OSTI]

A discussion of polyhomogeneity (asymptotic expansions in terms of $1/r$ and $\\ln r$) for zero-rest-mass fields and gravity and its relation with the Newman-Penrose (NP) constants is given. It is shown that for spin-$s$ zero-rest-mass fields propagating on Minkowski spacetime, the logarithmic terms in the asymptotic expansion appear naturally if the field does not obey the ``Peeling theorem''. The terms that give rise to the slower fall-off admit a natural interpretation in terms of advanced field. The connection between such fields and the NP constants is also discussed. The case when the background spacetime is curved and polyhomogeneous (in general) is considered. The free fields have to be polyhomogeneous, but the logarithmic terms due to the connection appear at higher powers of $1/r$. In the case of gravity, it is shown that it is possible to define a new auxiliary field, regular at null infinity, and containing some relevant information on the asymptotic behaviour of the spacetime. This auxiliary zero-rest-mass field ``evaluated at future infinity ($i^+$)'' yields the logarithmic NP constants.

J. A. Valiente-Kroon

1999-07-28T23:59:59.000Z

366

Portfolio Manager Space Type Discussion  

Broader source: Energy.gov [DOE]

This presentation, given through the DOE's Technical Assitance Program (TAP), provides a discussion about space/type in regards to the Portfolio Manager Initiative.

367

Types of Lighting in Commercial Buildings - Lighting Types  

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

Lighting Types Lighting Types The following are the most widely used types of lighting equipment used in commercial buildings. Characteristics such as energy efficiency, light quality, and lifetime vary by lamp type. Standard Fluorescent A fluorescent lamp consists of a sealed gas-filled tube. The gas in the tube consists of a mixture of low pressure mercury vapor and an inert gas such as argon. The inner surface of the tube has a coating of phosphor powder. When an electrical current is applied to electrodes in the tube, the mercury vapor emits ultraviolet radiation which then causes the phosphor coating to emit visible light (the process is termed fluorescence). A ballast is required to regulate and control the current and voltage. Two types of ballasts are used, magnetic and electronic. Electronic ballasts

368

Classification of GHZ-type, W-type and GHZ-W-type multiqubit entanglements  

E-Print Network [OSTI]

We propose the concept of SLOCC-equivalent basis (SEB) in the multiqubit space. In particular, two special SEBs, the GHZ-type and the W-type basis are introduced. They can make up a more general family of multiqubit states, the GHZ-W-type states, which is a useful kind of entanglement for quantum teleporatation and error correction. We completely characterize the property of this type of states, and mainly classify the GHZ-type states and the W-type states in a regular way, which is related to the enumerative combinatorics. Many concrete examples are given to exhibit how our method is used for the classification of these entangled states.

Lin Chen; Yi-Xin Chen

2006-05-23T23:59:59.000Z

369

Archived Reference Building Type: Hospital  

Broader source: Energy.gov [DOE]

Here you will find past versions of the commercial reference building models for existing buildings constructed in or after 1980, organized by building type and location. A summary of building types and climate zones is available for reference. Current versions are also available.

370

Archived Reference Building Type: Hospital  

Broader source: Energy.gov [DOE]

Here you will find past versions of the commercial reference building models for existing buildings constructed before 1980, organized by building type and location. A summary ofbuilding types and climate zonesis available for reference.Current versionsare also available.

371

Archived Reference Building Type: Warehouse  

Broader source: Energy.gov [DOE]

Here you will find past versions of the commercial reference building models for existing buildings constructed in or after 1980, organized by building type and location. A summary of building types and climate zones is available for reference. Current versions are also available.

372

Archived Reference Building Type: Warehouse  

Broader source: Energy.gov [DOE]

Here you will find past versions of the commercial reference building models for existing buildings constructed before 1980, organized by building type and location. A summary ofbuilding types and climate zonesis available for reference.Current versionsare also available.

373

Soft Typing PHP Patrick Camphuijsen  

E-Print Network [OSTI]

Soft Typing PHP Patrick Camphuijsen Jurriaan Hage Stefan Holdermans Technical Report UU-CS-2009.O. Box 80.089 3508 TB Utrecht The Netherlands #12;Soft Typing PHP with PHP-validator Patrick Camphuijsen@cs.uu.nl Abstract PHP is a popular language for building websites, but also notori- ously lax in that almost every

Utrecht, Universiteit

374

Cofinal types of directed orders  

E-Print Network [OSTI]

, ) directed partial orders #12;Cofinal types (P, ), (Q, ) directed partial orders Tukey reducibility: (P orders Tukey reducibility: (P, ) T (Q, ) if f : P Q X P unbounded = f [X] Q unbounded g : Q P Y Q cofinal = g[Y ] P cofinal #12;Cofinal types (P, ), (Q, ) directed partial orders Tukey reducibility: (P

Mátrai, Tamás

375

Theoretical models for Type I and Type II supernova  

SciTech Connect (OSTI)

Recent theoretical progress in understanding the origin and nature of Type I and Type II supernovae is discussed. New Type II presupernova models characterized by a variety of iron core masses at the time of collapse are presented and the sensitivity to the reaction rate /sup 12/C(..cap alpha..,..gamma..)/sup 16/O explained. Stars heavier than about 20 M/sub solar/ must explode by a ''delayed'' mechanism not directly related to the hydrodynamical core bounce and a subset is likely to leave black hole remnants. The isotopic nucleosynthesis expected from these massive stellar explosions is in striking agreement with the sun. Type I supernovae result when an accreting white dwarf undergoes a thermonuclear explosion. The critical role of the velocity of the deflagration front in determining the light curve, spectrum, and, especially, isotopic nucleosynthesis in these models is explored. 76 refs., 8 figs.

Woosley, S.E.; Weaver, T.A.

1985-01-01T23:59:59.000Z

376

Individual eigenvalue distributions for chGSE-chGUE crossover and determination of low-energy constants in two-color QCD+QED  

E-Print Network [OSTI]

We compute statistical distributions of individual low-lying eigenvalues of random matrix ensembles interpolating chiral Gaussian symplectic and unitary ensembles. To this aim we use the Nystrom-type discretization of Fredholm Pfaffians and resolvents of the dynamical Bessel kernel containing a single crossover parameter \\rho. The \\rho-dependent distributions of the four smallest eigenvalues are then used to fit the Dirac spectra of modulated SU(2) lattice gauge theory, in which the reality of the staggered SU(2) Dirac operator is weakly violated either by the U(1) gauge field or by a constant background flux. Combined use of individual eigenvalue distributions is effective in reducing statistical errors in \\rho; its linear dependence on the imaginary chemical potential \\mu_I enables precise determination of the pseudo-scalar decay constant F of the SU(2) gauge theory from a small lattice. The U(1)-coupling dependence of an equivalent of F^2 \\mu_I^2 in the SU(2) x U(1) theory is also obtained.

Nishigaki, Shinsuke M

2015-01-01T23:59:59.000Z

377

P-type gallium nitride  

DOE Patents [OSTI]

Several methods have been found to make p-type gallium nitride. P-type gallium nitride has long been sought for electronic devices. N-type gallium nitride is readily available. Discovery of p-type gallium nitride and the methods for making it will enable its use in ultraviolet and blue light-emitting diodes and lasers. pGaN will further enable blue photocathode elements to be made. Molecular beam epitaxy on substrates held at the proper temperatures, assisted by a nitrogen beam of the proper energy produced several types of p-type GaN with hole concentrations of about 5{times}10{sup 11} /cm{sup 3} and hole mobilities of about 500 cm{sup 2} /V-sec, measured at 250 K. P-type GaN can be formed of unintentionally-doped material or can be doped with magnesium by diffusion, ion implantation, or co-evaporation. When applicable, the nitrogen can be substituted with other group III elements such as Al. 9 figs.

Rubin, M.; Newman, N.; Fu, T.; Ross, J.; Chan, J.

1997-08-12T23:59:59.000Z

378

Calculation of nuclear spin-spin coupling constants using frozen density embedding  

SciTech Connect (OSTI)

We present a method for a subsystem-based calculation of indirect nuclear spin-spin coupling tensors within the framework of current-spin-density-functional theory. Our approach is based on the frozen-density embedding scheme within density-functional theory and extends a previously reported subsystem-based approach for the calculation of nuclear magnetic resonance shielding tensors to magnetic fields which couple not only to orbital but also spin degrees of freedom. This leads to a formulation in which the electron density, the induced paramagnetic current, and the induced spin-magnetization density are calculated separately for the individual subsystems. This is particularly useful for the inclusion of environmental effects in the calculation of nuclear spin-spin coupling constants. Neglecting the induced paramagnetic current and spin-magnetization density in the environment due to the magnetic moments of the coupled nuclei leads to a very efficient method in which the computationally expensive response calculation has to be performed only for the subsystem of interest. We show that this approach leads to very good results for the calculation of solvent-induced shifts of nuclear spin-spin coupling constants in hydrogen-bonded systems. Also for systems with stronger interactions, frozen-density embedding performs remarkably well, given the approximate nature of currently available functionals for the non-additive kinetic energy. As an example we show results for methylmercury halides which exhibit an exceptionally large shift of the one-bond coupling constants between {sup 199}Hg and {sup 13}C upon coordination of dimethylsulfoxide solvent molecules.

Gtz, Andreas W., E-mail: agoetz@sdsc.edu [San Diego Supercomputer Center, University of California San Diego, 9500 Gilman Dr MC 0505, La Jolla, California 92093-0505 (United States); Autschbach, Jochen [Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000 (United States)] [Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000 (United States); Visscher, Lucas, E-mail: visscher@chem.vu.nl [Amsterdam Center for Multiscale Modeling (ACMM), VU University Amsterdam, Theoretical Chemistry, De Boelelaan 1083, 1081 HV Amsterdam (Netherlands)] [Amsterdam Center for Multiscale Modeling (ACMM), VU University Amsterdam, Theoretical Chemistry, De Boelelaan 1083, 1081 HV Amsterdam (Netherlands)

2014-03-14T23:59:59.000Z

379

Development of low dielectric constant alumina-based ceramics for microelectronic substrates  

SciTech Connect (OSTI)

The performance of high speed computers depends not only on IC chips, but also on the signal propagation speed between these chips. The signal propagation delay in a computer is determined by the dielectric constant of the substrate material to which the IC chips are attached. In this study, a ceramic substrate with a low dielectric constant (k {approx} 5.0) has been developed. When compared with the traditional alumina substrate (k {approx} 10.0), the new material corresponds to a 37% decrease in the signal propagation delay. Glass hollow spheres are used to introduce porosity (k = 1.0) to the alumina matrix in a controlled manner. A surface coating technique via heterogeneous nucleation in aqueous solution has been used to improve the high temperature stability of these spheres. After sintering at 1,400 C, isolated spherical pores are uniformly distributed in the almost fully dense alumina matrix; negligible amounts of matrix defects can be seen. All pores are isolated from each other. Detailed analyses of the chemical composition find that the sintered sample consists of {alpha}-alumina, mullite and residual glass. Mullite is the chemical reaction product of alumina and the glass spheres. Residual glass exists because current firing conditions do not complete the mullitization reaction. The dielectric constant of the sintered sample is measured and then compared with the predicted value using Maxwell`s model. Mechanical strength is evaluated by a four-point bending test. Although the flexural strength decreases exponentially with porosity, samples with 34% porosity (k {approx} 5.0) still maintain adequate mechanical strength for the proper operation of a microelectronic substrate.

Wu, S.J. [Lawrence Berkeley Lab., CA (United States). Materials Science Div.]|[California Univ., Berkeley, CA (United States). Dept. of Materials Science and Mineral Engineering

1993-05-01T23:59:59.000Z

380

Recovering of dielectric constants of explosives via a globally strictly convex cost functional  

E-Print Network [OSTI]

The inverse problem of estimating dielectric constants of explosives using boundary measurements of one component of the scattered electric field is addressed. It is formulated as a coefficient inverse problem for a hyperbolic differential equation. After applying the Laplace transform, a new cost functional is constructed and a variational problem is formulated. The key feature of this functional is the presence of the Carleman Weight Function for the Laplacian. The strict convexity of this functional on a bounded set in a Hilbert space of an arbitrary size is proven. This allows for establishing the global convergence of the gradient descent method. Some results of numerical experiments are presented.

Michael V. Klibanov; Nguyen Trung Thnh

2014-08-04T23:59:59.000Z

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


381

Dilatation symmetry in higher dimensions and the vanishing of the cosmological constant  

E-Print Network [OSTI]

A wide class of dilatation symmetric actions in higher dimensions leads to a vanishing four-dimensional cosmological constant. This requires no tuning of parameters and results from the absence of an allowed potential for the scalar dilaton field. The field equations admit many solutions with flat four-dimensional space and non-vanishing gauge couplings. In a more general setting, these are candidates for asymptotic states of cosmological runaway solutions, where dilatation symmetry is realized if a fixed point is approached as time goes to infinity. Dilatation anomalies during the runaway can lift the degeneracy of solutions.

Wetterich, C

2008-01-01T23:59:59.000Z

382

Dilatation symmetry in higher dimensions and the vanishing of the cosmological constant  

E-Print Network [OSTI]

A wide class of dilatation symmetric effective actions in higher dimensions leads to a vanishing four-dimensional cosmological constant. This requires no tuning of parameters and results from the absence of an allowed potential for the scalar dilaton field. The field equations admit many solutions with flat four-dimensional space and non-vanishing gauge couplings. In a more general setting, these are candidates for asymptotic states of cosmological runaway solutions, where dilatation symmetry is realized dynamically if a fixed point is approached as time goes to infinity. Dilatation anomalies during the runaway can lift the degeneracy of solutions and lead to an observable dynamical dark energy.

C. Wetterich

2008-06-04T23:59:59.000Z

383

Non-perturbative computation of the strong coupling constant on the lattice  

E-Print Network [OSTI]

We review the long term project of the ALPHA collaboration to compute in QCD the running coupling constant and quark masses at high energy scales in terms of low energy hadronic quantities. The adapted techniques required to numerically carry out the required multiscale non-perturbative calculation with our special emphasis on the control of systematic errors are summarized. The complete results in the two dynamical flavor approximation are reviewed and an outlook is given on the ongoing three flavor extension of the programme with improved target precision.

Sommer, Rainer

2015-01-01T23:59:59.000Z

384

Eigenvalues of Laplacian with constant magnetic field on non-compact hyperbolic surfaces with finite area  

E-Print Network [OSTI]

We consider a magnetic Laplacian $-\\Delta_A=(id+A)^\\star (id+A)$ on a noncompact hyperbolic surface $\\mM $ with finite area. $A$ is a real one-form and the magnetic field $dA$ is constant in each cusp. When the harmonic component of $A$ satifies some quantified condition, the spectrum of $-\\Delta_A$ is discrete. In this case we prove that the counting function of the eigenvalues of $-\\Delta_{A}$ satisfies the classical Weyl formula, even when $dA=0. $

Morame, Abderemane

2010-01-01T23:59:59.000Z

385

Eigenvalues of Laplacian with constant magnetic field on non-compact hyperbolic surfaces with finite area  

E-Print Network [OSTI]

We consider a magnetic Laplacian $-\\Delta_A=(id+A)^\\star (id+A)$ on a noncompact hyperbolic surface $\\mM $ with finite area. $A$ is a real one-form and the magnetic field $dA$ is constant in each cusp. When the harmonic component of $A$ satifies some quantified condition, the spectrum of $-\\Delta_A$ is discrete. In this case we prove that the counting function of the eigenvalues of $-\\Delta_{A}$ satisfies the classical Weyl formula, even when $dA=0. $

Abderemane Morame; Francoise Truc

2010-04-29T23:59:59.000Z

386

Goos-Hnchen like Shifts for Graphene Barrier in Constant Magnetic Field  

E-Print Network [OSTI]

We consider a system of Dirac fermions in graphene submitted to a constant perpendicular magnetic field and scattered by a barrier potential. We show that our system can be used to establish a link with quantum optics through the Goos-H\\"{a}nchen shifts. This can be done by evaluating the corresponding transmission probability and shift phase. We obtain Goos-H\\"{a}nchen like shifts in terms of different physical parameters such as energy, electrostatic potential strength and magnetic field. On the light of this relation, we discuss the obtained results and make comparison with literature.

Ahmed Jellal; Miloud Mekkaoui; Youness Zahidi

2014-04-17T23:59:59.000Z

387

Feedback control of torsion balance in measurement of gravitational constant G with angular acceleration method  

SciTech Connect (OSTI)

The performance of the feedback control system is of central importance in the measurement of the Newton's gravitational constant G with angular acceleration method. In this paper, a PID (Proportion-Integration-Differentiation) feedback loop is discussed in detail. Experimental results show that, with the feedback control activated, the twist angle of the torsion balance is limited to 7.310{sup ?7} rad /?( Hz ) at the signal frequency of 2?mHz, which contributes a 0.4 ppm uncertainty to the G value.

Quan, Li-Di [MOE Key Laboratory of Fundamental Physical Quantities Measurements, School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074 (China) [MOE Key Laboratory of Fundamental Physical Quantities Measurements, School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074 (China); School of Automation, Huazhong University of Science and Technology, Wuhan, Hubei 430074 (China); Xue, Chao; Shao, Cheng-Gang; Yang, Shan-Qing; Tu, Liang-Cheng; Luo, Jun, E-mail: junluo@mail.hust.edu.cn [MOE Key Laboratory of Fundamental Physical Quantities Measurements, School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074 (China)] [MOE Key Laboratory of Fundamental Physical Quantities Measurements, School of Physics, Huazhong University of Science and Technology, Wuhan, Hubei 430074 (China); Wang, Yong-Ji [School of Automation, Huazhong University of Science and Technology, Wuhan, Hubei 430074 (China)] [School of Automation, Huazhong University of Science and Technology, Wuhan, Hubei 430074 (China)

2014-01-15T23:59:59.000Z

388

A New Large-Number Coincidence and a Scaling Law for the Cosmological Constant  

E-Print Network [OSTI]

An ensemble of pure numbers of order near 10^122 is produced naturally from the fundamental parameters of modern cosmology. This new large-number coincidence problem is resolved by demonstrating implicit physical connections that follow from the standard cosmological model. However, the occurrence of the new large-number coincidence combined with the known coincidence among pure numbers of order near 10^40 poses a distinct problem that is resolved with a scaling law for the cosmological constant that was originally proposed by Zel'dovich.

Scott Funkhouser

2008-03-16T23:59:59.000Z

389

Constant Q measurements of collective modes in Mg{sub 70}Zn{sub 30} glass  

SciTech Connect (OSTI)

In this study the Neutron Brillouin Scattering technique has been used to measure longitudinal excitations in a magnesium-zinc glass at momentum transfers within the first pseudo-Brillouin zone. The measurements were performed at room temperature and constant momentum transfer, which enables the data to be readily and reliably compared with theory. The experimental results taken down to Q = 6.2 nm{sup {minus}1} and E = 27 meV show a 5 meV downward shift in the dispersion energy of the longitudinal optic mode of the glass when compared to theoretical predictions.

Benmore, C.J. [Univ. of Guelph, Ontario (Canada). Dept. of Physics]|[Rutherford Appleton Lab., Chilton (United Kingdom). ISIS Facility; Sweeney, S. [Univ. of Guelph, Ontario (Canada). Dept. of Physics]|[Univ. of Victoria, British Columbia (Canada); Robinson, R.A. [Los Alamos National Lab., NM (United States); Egelstaff, P.A. [Univ. of Guelph, Ontario (Canada). Dept. of Physics; Suck, J.B. [T.U. Chemnitz-Zwickau, Chemnitz (Germany). Inst. fuer Physik

1997-11-01T23:59:59.000Z

390

Many-Body Perturbation Calculation of the Indirect Spin-Spin Coupling Constant in HD Molecule  

Science Journals Connector (OSTI)

The linked-cluster many-body perturbation approach has been applied to the study of indirect nuclear spin-spin coupling constant JHD in HD molecule. The complete set of states used were the bound and continuum states of H2+ molecular ion with the internuclear separation appropriate to H2 molecule. Our calculated value of JHD through the Fermi contact interaction mechanism is +42.57 Hz in good agreement with the most recent experimental value of +42.70.7 Hz.

C. M. Dutta; N. C. Dutta; T. P. Das

1970-12-21T23:59:59.000Z

391

Study on Cook-off Test of HNS at Constant Temperatures  

Science Journals Connector (OSTI)

In order to obtain the characterization of HNS under cook-off condition, the cook-off tests of 3 sizes of sealed HNS pellets, 3mm 4mm, 4mm5mm and 4mm6mm, were carried out under 4 constant temperatures, 400C, 350C, 320Cand 315C. The reaction responses were determined by the damage or distortion of sample tubes and its vulnerable place. The results show that the reaction temperatures take on the decreasing trend with the increasing of charge weight under the same environment temperature. When the charge weights are the same, with the increasing of environment temperature, the reaction temperatures go down.

Zhenhua Du; Rui Zhang; Dongxiao Fu; Honghai Tong; Fang Li

2012-01-01T23:59:59.000Z

392

Noninvasive valve monitor using constant magnetic and/or DC electromagnetic field  

DOE Patents [OSTI]

One or more sources of steady magnetic field are carefully located on the outside of a valve body. The constant magnetic field is transmitted into the valve body and valve internals. A magnetic field detector carefully located on the outside of the valve body detects the intensity of the magnetic field at its location. As the position of a valve internal part is changed, there is an alteration in the magnetic field in the valve, and a consequent change in the detected magnetic field. Changes in the detected signal provide an indication of the position and motion of the valve internals.

Casada, D.A.; Haynes, H.D.

1993-08-17T23:59:59.000Z

393

Cooling carbon nanotubes to the phononic ground state with constant electron current  

E-Print Network [OSTI]

We present a quantum theory of cooling of a mechanical resonator using back-action with constant electron current. The resonator device is based on a doubly clamped nanotube, which mechanically vibrates and acts as a double quantum dot for electron transport. Mechanical vibrations and electrons are coupled electrostatically using an external gate. The fundamental eigenmode is cooled by absorbing phonons when electrons tunnel through the double quantum dot. We identify the regimes in which ground state cooling can be achieved for realistic experimental parameters.

Stefano Zippilli; Giovanna Morigi; Adrian Bachtold

2009-03-06T23:59:59.000Z

394

Soil damping constants related to common soil properties in sands and clays  

E-Print Network [OSTI]

for the Granular Materials Tested 83 V ITA 88 Vii LIST OP TABLES Table. Results of Tests on Ottawa Sand Page 22 Result. s of Tests on Arkansas Sand 23 Results of Tests on Victoria Sand 24 VI VII Error Resulting from Approximations Study of Void Ratio... Sand Nohr's Circle Diagram for Victoria Sand 65 82 N0TATION The following symbols are used in this study: CE 35 EA 62 EA 60 EA 55 EA 50 fps a viscous damping constant, Eall pit sandy clay at an approximate moisture content of 35 percent...

Gibson, Gary Clive

1968-01-01T23:59:59.000Z

395

Lagrangian formulation of massive fermionic higher spin fields on a constant electromagnetic background  

E-Print Network [OSTI]

We consider massive half-integer higher spin fields coupled to an external constant electromagnetic field in flat space of an arbitrary dimension and construct a gauge invariant Lagrangian in the linear approximation in the external field. A procedure for finding the gauge-invariant Lagrangians is based on the BRST construction where no off-shell constraints on the fields and on the gauge parameters are imposed from the very beginning. As an example of the general procedure, we derive a gauge invariant Lagrangian for a massive fermionic field with spin 3/2 which contains a set of auxiliary fields and gauge symmetries.

Buchbinder, I L; Tsulaia, M

2015-01-01T23:59:59.000Z

396

From the Cosmological Constant: Higgs Boson, Dark Matter, and Quantum Gravity Scales  

E-Print Network [OSTI]

We suggest discovery targets for the Higgs boson, dark matter, and quantum gravity mass scales, motivated by the Dirac equation for the electron in deSitter space, and a sixth-order constraint between the electron QED parameters and the cosmological constant. We go on to show that this constraint can be viewed as a structural parameter of the electron, and leads naturally to a new cosmic horizon. A dual fourth-order constraint implies a second-order one, from which the electron neutrino mass is derived.

James R. Bogan

2009-02-16T23:59:59.000Z

397

Variation of calibration constant of alpha track detectors with respect to altitude  

E-Print Network [OSTI]

) Latha Vasudevan, B. S. ; M. S. , Kerala University, India Chair of Advisory Committee: Dr. Milton E. McLain Improved alpha track etch detectors have been widely used to monitor low levels of radon in the indoor environment over long integrating times.... Cellulose nitrate LR 115 II alpha track detectors were exposed in two different configurations (open and closed) in a known radon atmosphere to obtain an appropriate calibration constant (tracks cm '/kBq-h-m') for the LR 115 II film. The establishment...

Vasudevan, Latha

2012-06-07T23:59:59.000Z

398

Elastic Constants of Solid Ar, Kr, and Xe: A Monte Carlo Study  

Science Journals Connector (OSTI)

The elastic constants of classical systems of 108 particles arranged (with periodic boundary conditions) on an fcc lattice and interacting with pairwise-additive forces have been evaluated to an accuracy of about 2% by a Monte Carlo procedure closely related to that used by Hoover and his co-workers. For Ar(80 K) and Kr(85 and 115 K) we have used the Bobetic-Barker pair potentials and also included the corrections for the truncated tail of the pair potential, quantum effects, and three-body forces. For Ar(80 K) and Xe(156 K) we have carried out a similar calculation for the familiar Lennard-Jones 6:12 potential. Our 6:12 Ar(80 K) elastic constants agree well with the previous work of Hoover et al. but unfortunately differ only little from the more realistic Bobetic-Barker Ar(80 K) values. Bulk moduli for both potentials are compatible with the currently available experimental data. Comparison of our Kr results with experimental data indicates a need for refinement of the Bobetic-Barker Kr potential. The Xe(156 K) results agree very well with the recent Brillouin-scattering work of Gornall and Stoicheff which is to some extent disappointing because the same 6:12 potential is in poor agreement with the low-temperature heat capacity.

M. L. Klein and R. D. Murphy

1972-09-15T23:59:59.000Z

399

NVU dynamics. I. Geodesic motion on the constant-potential-energy hypersurface  

E-Print Network [OSTI]

An algorithm is derived for computer simulation of geodesics on the constant potential-energy hypersurface of a system of N classical particles. First, a basic time-reversible geodesic algorithm is derived by discretizing the geodesic stationarity condition and implementing the constant potential energy constraint via standard Lagrangian multipliers. The basic NVU algorithm is tested by single-precision computer simulations of the Lennard-Jones liquid. Excellent numerical stability is obtained if the force cutoff is smoothed and the two initial configurations have identical potential energy within machine precision. Nevertheless, just as for NVE algorithms, stabilizers are needed for very long runs in order to compensate for the accumulation of numerical errors that eventually lead to "entropic drift" of the potential energy towards higher values. A modification of the basic NVU algorithm is introduced that ensures potential-energy and step-length conservation; center-of-mass drift is also eliminated. Analytical arguments confirmed by simulations demonstrate that the modified NVU algorithm is absolutely stable. Finally, simulations show that the NVU algorithm and the standard leap-frog NVE algorithm have identical radial distribution functions for the Lennard-Jones liquid.

Trond S. Ingebrigtsen; Sren Toxvaerd; Ole J. Heilmann; Thomas B. Schrder; Jeppe C. Dyre

2011-08-06T23:59:59.000Z

400

Dependence of holomorphicity of the gauge coupling constant on the mass matrix in supersymmetric theories  

Science Journals Connector (OSTI)

We investigate the dependence of the holomorphicity of the gauge coupling constant function on the mass matrix at one- and two-loop levels in supersymmetric theories. Gauge invariance puts constraints on the mass matrix. These constraints at the one-loop level lead us to three cases of mass matrix that require different ways of regulating the infrared contributions: massive, pseudomassive, and intrinsically massless. The first two give rise to a holomorphic gauge coupling constant function whereas the last one does not. Two-loop contributions to super QED and super Yang-Mills theory are calculated using the super background field method and their dependence on the mass matrix is found to fall under the same three cases as at the one-loop level. Remarks concerning the general nature of this result to all orders in perturbation theory are included. Making use of our two-loop results we also verify the holomorphicity of the Wilson coupling based on general arguments of Shifman and Vainshtein.

H. S. Li and K. T. Mahanthappa

1994-05-15T23:59:59.000Z

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


401

Dynamically avoiding fine-tuning the cosmological constant: the ''Relaxed Universe''  

SciTech Connect (OSTI)

We demonstrate that there exists a large class of F(R,G) action functionals of the scalar curvature and of the Gau-Bonnet invariant which are able to relax dynamically a large cosmological constant (CC), whatever it be its starting value in the early universe. Hence, it is possible to understand, without fine-tuning, the very small current value ?{sub 0} ? H{sub 0}{sup 2} of the CC as compared to its theoretically expected large value in quantum field theory and string theory. In our framework, this relaxation appears as a pure gravitational effect, where no ad hoc scalar fields are needed. The action involves a positive power of a characteristic mass parameter, M, whose value can be, interestingly enough, of the order of a typical particle physics mass of the Standard Model of the strong and electroweak interactions or extensions thereof, including the neutrino mass. The model universe emerging from this scenario (the ''Relaxed Universe'') falls within the class of the so-called ?XCDM models of the cosmic evolution. Therefore, there is a ''cosmon'' entity X (represented by an effective object, not a field), which in this case is generated by the effective functional F(R,G) and is responsible for the dynamical adjustment of the cosmological constant. This model universe successfully mimics the essential past epochs of the standard (or ''concordance'') cosmological model (?CDM). Furthermore, it provides interesting clues to the coincidence problem and it may even connect naturally with primordial inflation.

Bauer, Florian; Sol, Joan [High Energy Physics Group, Dept. ECM, and Institut de Cincies del Cosmos Univ. de Barcelona, Av. Diagonal 647, E-08028 Barcelona, Catalonia (Spain); tefanci?, Hrvoje, E-mail: fbauer@ecm.ub.es, E-mail: sola@ecm.ub.es, E-mail: shrvoje@thphys.irb.hr [Theoretical Physics Division, Rudjer Bokovi? Institute, PO Box 180, HR-10002 Zagreb (Croatia)

2010-12-01T23:59:59.000Z

402

Reduction of iron-oxide-carbon composites: part I. Estimation of the rate constants  

SciTech Connect (OSTI)

A new ironmaking concept using iron-oxide-carbon composite pellets has been proposed, which involves the combination of a rotary hearth furnace (RHF) and an iron bath smelter. This part of the research focuses on studying the two primary chemical kinetic steps. Efforts have been made to experimentally measure the kinetics of the carbon gasification by CO{sub 2} and wustite reduction by CO by isolating them from the influence of heat- and mass-transport steps. A combined reaction model was used to interpret the experimental data and determine the rate constants. Results showed that the reduction is likely to be influenced by the chemical kinetics of both carbon oxidation and wustite reduction at the temperatures of interest. Devolatilized wood-charcoal was observed to be a far more reactive form of carbon in comparison to coal-char. Sintering of the iron-oxide at the high temperatures of interest was found to exert a considerable influence on the reactivity of wustite by virtue of altering the internal pore surface area available for the reaction. Sintering was found to be predominant for highly porous oxides and less of an influence on the denser ores. It was found using an indirect measurement technique that the rate constants for wustite reduction were higher for the porous iron-oxide than dense hematite ore at higher temperatures (> 1423 K). Such an indirect mode of measurement was used to minimize the influence of sintering of the porous oxide at these temperatures.

Halder, S.; Fruehan, R.J. [Praxair Inc., Tonawanda, NY (United States). Technological Center

2008-12-15T23:59:59.000Z

403

A MATLAB Code for Three Dimensional Linear Elastostatics using Constant Boundary Elements  

E-Print Network [OSTI]

Present work presents a code written in the very simple programming language MATLAB, for three dimensional linear elastostatics, using constant boundary elements. The code, in full or in part, is not a translation or a copy of any of the existing codes. Present paper explains how the code is written, and lists all the formulae used. Code is verified by using the code to solve a simple problem which has the well known approximate analytical solution. Of course, present work does not make any contribution to research on boundary elements, in terms of theory. But the work is justified by the fact that, to the best of author's knowledge, as of now, one cannot find an open access MATLAB code for three dimensional linear elastostatics using constant boundary elements. Author hopes this paper to be of help to beginners who wish to understand how a simple but complete boundary element code works, so that they can build upon and modify the present open access code to solve complex engineering problems quickly and easi...

P, Kirana Kumara

2013-01-01T23:59:59.000Z

404

Determination of the Elastic Constants of a Unidirectional Fiber Composite Using Ultrasonic Velocity Measurements  

Science Journals Connector (OSTI)

Ultrasonic velocitymeasurements have been made to obtain the dynamic elastic stiffnesses necessary to determine fully the elastic properties of a unidirectional glass?reinforced epoxy?fiber composite. In units of 106 psi these stiffnesses are C 11=6.01 C 22=C 33=2.58 C 12=C 13=0.70 C 23=1.42 and C 44=0.49 where the subscript 1 refers to the fiber direction. Since more velocities were measured than were necessary to obtain the five constants required by the symmetry of this composite the extra measurements were used to check on the experimental method. Analysis shows the ultrasonic technique to be satisfactory for measurement of the elastic stiffnesses of a fiber composite. The experimental results are compared with the elastic constants predicted for this composite from expressions based upon several theoreticalmodels. Good agreement is obtained when the theoretical calculations are made using the dynamic (as opposed to the static) modulus of the epoxy matrix.

J. E. Zimmer; James R. Cost

1970-01-01T23:59:59.000Z

405

Variation of lattice constant and cluster formation in GaAsBi  

SciTech Connect (OSTI)

We investigate the structural properties of GaAsBi layers grown by molecular beam epitaxy on GaAs at substrate temperatures between 220315 C. Irrespective of the growth temperature, the structures exhibited similar Bi compositions, and good overall crystal quality as deduced from X-Ray diffraction measurements. After thermal annealing at temperatures as low as 500 C, the GaAsBi layers grown at the lowest temperatures exhibited a significant reduction of the lattice constant. The lattice variation was significantly larger for Bi-containing samples than for Bi-free low-temperature GaAs samples grown as a reference. Rutherford backscattering spectrometry gave no evidence of Bi diffusing out of the layer during annealing. However, dark-field and Z-contrast transmission electron microscopy analyses revealed the formation of GaAsBi clusters with a Bi content higher than in the surrounding matrix, as well as the presence of metallic As clusters. The apparent reduction of the lattice constant can be explained by a two-fold process: the diffusion of the excess As incorporated within As{sub Ga} antisites to As clusters, and the reduction of the Bi content in the GaAs matrix due to diffusion of Bi to GaAsBi clusters. Diffusion of both As and Bi are believed to be assisted by the native point defects, which are present in the low-temperature as-grown material.

Puustinen, J.; Schramm, A.; Guina, M. [Optoelectronics Research Centre, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere (Finland)] [Optoelectronics Research Centre, Tampere University of Technology, P.O. Box 692, FI-33101 Tampere (Finland); Wu, M.; Luna, E. [Paul-Drude Institut fr Festkrperelektronik, Hausvogteiplatz 5-7, 10117 Berlin (Germany)] [Paul-Drude Institut fr Festkrperelektronik, Hausvogteiplatz 5-7, 10117 Berlin (Germany); Laukkanen, P. [Department of Physics and Astronomy, University of Turku, FI-20014 Turku (Finland)] [Department of Physics and Astronomy, University of Turku, FI-20014 Turku (Finland); Laitinen, M.; Sajavaara, T. [Department of Physics, University of Jyvskyl, P.O. Box 35, FI-40014 Jyvskyl (Finland)] [Department of Physics, University of Jyvskyl, P.O. Box 35, FI-40014 Jyvskyl (Finland)

2013-12-28T23:59:59.000Z

406

Understanding the changes and constants of the courtyard house neighborhoods in Beijing  

E-Print Network [OSTI]

The courtyard houses in Beijing, named siheyuan, have undergone many changes during the last three decades. The siheyuan is a type of house that had slowly developed over more than two thousand years. At the beginning of ...

Casault, Andr

1988-01-01T23:59:59.000Z

407

A constant shear stress core flow model of the bidirectional vortex  

Science Journals Connector (OSTI)

...Chiaverini, M. J., Sauer, J. A. Knuth, W. H. 2004 Numerical code development for simulating gel propellant combustion processes. JANNAF Paper (unclassified). Ogawa, A 1984Estimation of the collection efficiencies of the three types of...

2009-01-01T23:59:59.000Z

408

Types of Reuse | Department of Energy  

Broader source: Energy.gov (indexed) [DOE]

Services » Property » Property Reuse » Types of Reuse Services » Property » Property Reuse » Types of Reuse Types of Reuse Types of Reuse Types of Reuse Types of Reuse Types of Reuse Types of Reuse Types of Reuse Types of Reuse Types of Reuse Types of Reuse Types of Reuse The following provides greater detail regarding the types of reuse pursued for LM sites. It should be noted that many actual reuses combine several types of the uses listed below. Agriculture Many of the LM lands in the west are surrounded by open rangeland administered by the Bureau of Land Management or large ranches that are primarily used for grazing. LM promotes agricultural uses of lands that are surrounded by existing agricultural operations. Agricultural uses, such as cultivation of crops, could be combined with habitat improvements or

409

Federal Energy Management Program: Maintenance Types  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Maintenance Types Maintenance Types to someone by E-mail Share Federal Energy Management Program: Maintenance Types on Facebook Tweet about Federal Energy Management Program: Maintenance Types on Twitter Bookmark Federal Energy Management Program: Maintenance Types on Google Bookmark Federal Energy Management Program: Maintenance Types on Delicious Rank Federal Energy Management Program: Maintenance Types on Digg Find More places to share Federal Energy Management Program: Maintenance Types on AddThis.com... Sustainable Buildings & Campuses Operations & Maintenance Federal Requirements Program Management Commissioning Metering Computerized Maintenance Management Systems Maintenance Types Reactive Preventive Predictive Reliability-Centered Major Equipment Types Resources Contacts

410

Diffraction-Limited Constant-Resolution Zoom Lens Across Multi-Wavelengths for the Advanced Technology Solar Telescope  

Science Journals Connector (OSTI)

Constant-resolution is needed over a wide spectral range (388nm to 805 nm) for CCD sampling. The zoom lens, consisting of eleven elements, yields a diffraction limited image at nine...

An, Hyun Kyoung; Pitalo, Stephen K

411

Effect of Temporal Acquisition Parameters on the Image Quality of Ultrasound Axial Strain Time-constant Elastograms  

E-Print Network [OSTI]

constant (TC) have been developed. The axial strain TC is a parameter that is related to the viscoelastic and poroelastic behavior of tissues. Estimation of this parameter can be done using curve fitting methods. However, the effect of temporal...

Varghese, Joshua

2011-08-02T23:59:59.000Z

412

Transport method for determining the association constants of complexes formed between aromatic hydrocarbons and?- and?-cyclodextrin in water  

Science Journals Connector (OSTI)

The association constants of 1 : 1 complexes formed in water between six aromatic hydrocarbons (o-,m-, andp-xylene, naphthalene, anthracene, and pyrene) and?- and?-cyclodextrin were determined by the transport me...

Bo-Long Poh; Yoke Mooi Chow

1992-01-01T23:59:59.000Z

413

Channel specific rate constants relevant to the thermal decomposition of disilane.  

SciTech Connect (OSTI)

Rate constants for the thermal dissociation of Si{sub 2}H{sub 6} are predicted with a novel transition state model. The saddle points for dissociation on the Si{sub 2}H{sub 6} potential energy surface are lower in energy than the corresponding separated products, as confirmed by high level ab initio quantum mechanical calculations. Thus, the dissociations of Si{sub 2}H{sub 6} to produce SiH{sub 2} + SiH{sub 4} (R1) and H{sub 3}SiSiH + H{sub 2} (R2) both proceed through tight inner transition states followed by loose outer transition states. The present 'dual' transition state model couples variational phase space theory treatments of the outer transition states with ab initio based fixed harmonic vibrator treatments of the inner transition states to obtain effective numbers of states for the two transition states acting in series. It is found that, at least near room temperature, such a dual transition state model is generally required for the proper description of each of the dissociations. Only at quite high temperatures, i.e., above 2000 K for (R1) and 600 K for (R2), does a single fixed inner transition state provide an adequate description. Similarly, only at quite low temperatures (below 100 and 10 K for (R1) and (R2), respectively) does a single outer transition state provide an adequate description. Pressure dependent rate constants are obtained from solutions to the multichannel master equation. These calculations confirm that dissociation channel (R2) is negligible under conditions relevant to the thermal chemical vapor deposition (CVD) processes. Rate constants for the chemical activation reactions, SiH{sub 2} + SiH{sub 4} {yields} Si{sub 2}H{sub 6} (R-1) and SiH{sub 2} + SiH{sub 4} {yields} H{sub 3}SiSiH + H{sub 2} (R3), are also evaluated within the dual transition state model. It is found that reaction R3 is the dominant channel for low pressures and high temperatures, i.e., below 100 Torr for temperatures above 1100 K.

Matsumoto, Keiji (University of Tokyo, Tokyo, Japan); Klippenstein, Stephen J.; Koshi, Mitsuo (University of Tokyo, Tokyo, Japan); Tonokura, Kenichi (University of Tokyo, Tokyo, Japan)

2005-01-01T23:59:59.000Z

414

Requirements for Foreign National Payments Type of Payment Visa Type  

E-Print Network [OSTI]

8233 36% 36% Royalty* NA NA NA NA Yes NA* No Yes W8BEN Varies 1. The visa types listed are the most related to the field of study on the I-20. 10. For Royalty payments the visa doc is not needed when

Wolpert, Robert L

415

Description of CBECS Building Types  

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

Description of Building Types Description of Building Types Description of CBECS Building Types In the Commercial Buildings Energy Consumption Survey (CBECS), buildings are classified according to principal activity, which is the primary business, commerce, or function carried on within each building. Buildings used for more than one of the activities described below are assigned to the activity occupying the most floorspace at the time of the interview. Thus, a building assigned to a particular principal activity category may be used for other activities in a portion of its space or at some time during the year. In the 1999 CBECS, respondents were asked to place their building into a sub-category that was a more specific activity than has been collected in prior surveys. This was done to ensure the quality of the data; after data collection, the subcategories were combined into these more general building categories, which are consistent with prior CBECS surveys.

416

Una interpretaci\\'on f\\'isica de la constante de Planck  

E-Print Network [OSTI]

According to the commonly accepted interpretation of Quantum Mechanics, it is only possible to talk about the existence of elementary particles when they are detected by an experiment or by a classical measurement device. This has led to distortions with regard to the objective existence of reality, since it would be necessary an observer to materialize the elementary particle. This issue is solved when the elementary particle is placed in permanent interaction with the rest of the universe, so its existence would not depend on any intelligent observer and thus the objective range of elementary particles would be recovered. This article explores the interaction between elementary particles and a background action field of stochastic character and it is also determined that the standard deviation of the particle-background field interaction is essentially the Planck constant, since the expressions of the energy according to the Planck postulate and the momentum according to the Louis de Broglie thesis follow i...

Alvarez-Samaniego, Wilson P; Moya-Alvarez, Douglas

2013-01-01T23:59:59.000Z

417

Improved measurement of the pseudoscalar decay constant fD(s)  

E-Print Network [OSTI]

models. The decay rate for Ds 1 is given by @1,2# G ~ Ds 1!l1n!5 GF 2 8p f Ds 2 ml 2M DsS 12 ml 2 M Ds 2 D 2 uVcsu2, ~1! where M Ds is the Ds mass, ml is the mass of the final state lepton, Vcs is a CKM matrix element equal to 0.974 @3#, and GF... was supporte tional Science Foundation, the U.S. Departmen and the Natural Sciences and Engineering Resea of Canada.G ~ Ds 1!m1ng! G ~ Ds 1!m1n! 5~1210!310 22 mV 2 GeV2, ~8! where mV 2 is a vector coupling constant which has a value of approximately 0.1...

Baringer, Philip S.

1998-06-22T23:59:59.000Z

418

Fluctuation-dissipation theorem in general relativity and the cosmological constant  

SciTech Connect (OSTI)

Vacuum fluctuations are an essential feature of quantum field theory. Yet, the smallness of the scalar curvature of our universe suggests that the zero-point energy associated with these fluctuations does not curve spacetime. A possible way out of this paradox is suggested by the fact that microscopic fluctuations are generally accompanied by dissipative behavior in macroscopic systems. The intimate relation between the two is expressed by a fluctuation-dissipation theorem which extends to general relativity. The connection between quantum fluctuations and dissipation suggests a mechanism for the conversion of coherent stresses in the curvature of space into ordinary matter or radiation, thereby relaxing the effective cosmological ``constant`` to zero over time. The expansion of the universe may be the effect of this time-asymmetric relaxation process.

Mottola, E.

1992-06-01T23:59:59.000Z

419

Fluctuation-dissipation theorem in general relativity and the cosmological constant  

SciTech Connect (OSTI)

Vacuum fluctuations are an essential feature of quantum field theory. Yet, the smallness of the scalar curvature of our universe suggests that the zero-point energy associated with these fluctuations does not curve spacetime. A possible way out of this paradox is suggested by the fact that microscopic fluctuations are generally accompanied by dissipative behavior in macroscopic systems. The intimate relation between the two is expressed by a fluctuation-dissipation theorem which extends to general relativity. The connection between quantum fluctuations and dissipation suggests a mechanism for the conversion of coherent stresses in the curvature of space into ordinary matter or radiation, thereby relaxing the effective cosmological constant'' to zero over time. The expansion of the universe may be the effect of this time-asymmetric relaxation process.

Mottola, E.

1992-01-01T23:59:59.000Z

420

Turbine set with a generator feeding a network of constant frequency  

SciTech Connect (OSTI)

In a turbine set with an axial flow which is traversed by water and which is coupled to a generator feeding a network of constant frequency, the flow turbine is a propeller turbine with nonadjustable blades. The stator winding of the generator is connected to the network by means of a frequency-controllable converter, in particular a direct converter. The speed of rotation of the turbine set is controllable continuously according to the power to be delivered. In the case of an asynchronous design of the generator, it is advisable to provide the stator with a waterproof jacket on the inside and to flange it into the turbine tube, since the rotor with its cage winding is swept by water.

Spirk, F.

1983-01-11T23:59:59.000Z

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


421

Highly charged ions for atomic clocks and search for variation of the fine structure constant  

E-Print Network [OSTI]

We review a number of highly charged ions which have optical transitions suitable for building extremely accurate atomic clocks. This includes ions from Hf$^{12+}$ to U$^{34+}$, which have the $4f^{12}$ configuration of valence electrons, the Ir$^{17+}$ ion, which has a hole in almost filled $4f$ subshell, the Ho$^{14+}$, Cf$^{15+}$, Es$^{17+}$ and Es$^{16+}$ ions. Clock transitions in most of these ions are sensitive to variation of the fine structure constant, $\\alpha$ ($\\alpha = e^2/\\hbar c$). E.g., californium and einsteinium ions have largest known sensitivity to $\\alpha$-variation while holmium ion looks as the most suitable ion for experimental study. We study the spectra of the ions and their features relevant to the use as frequency standards.

Dzuba, V A

2015-01-01T23:59:59.000Z

422

Can a variable gravitational constant resolve the Faint Young Sun Paradox ?  

E-Print Network [OSTI]

Solar models suggest that four billion years ago the young Sun was about 25% fainter than it is today, rendering Earth's oceans frozen and lifeless. However, there is ample geophysical evidence that Earth had a liquid ocean teeming with life 4 Gyr ago. Since ${\\cal L_\\odot} \\propto G^7M_\\odot^5$, the Sun's luminosity ${\\cal L_\\odot}$ is exceedingly sensitive to small changes in the gravitational constant $G$. We show that a percent-level increase in $G$ in the past would have prevented Earth's oceans from freezing, resolving the faint young Sun paradox. Such small changes in $G$ are consistent with observational bounds on ${\\Delta G}/G$. Since ${\\cal L}_{\\rm SNIa} \\propto G^{-3/2}$, an increase in $G$ leads to fainter supernovae, creating tension between standard candle and standard ruler probes of dark energy. Precisely such a tension has recently been reported by the Planck team.

Varun Sahni; Yuri Shtanov

2014-11-05T23:59:59.000Z

423

Krein Quantization Approach to the Vacuum Energy and Cosmological Constant Problem  

E-Print Network [OSTI]

In this paper, we consider a new version of indefinite metric field quantization called "Krein" quantization approach. Centering on the vacuum energy, fundamental subjects revolve around this concept will be discussed. In this approach, vacuum expectation value of the energy-momentum tensor can be defined properly and uniquely. Actually, no infinite term appears and the vacuum energy of the free field vanishes. These properties allow us to propose a discussion which can be helpful to address cosmological constant problem. Achieving this goal, however, necessitates consistency of the theory with conventional ones, so we have studied and made comparison essential issues such as unitarity of the theory, physical achievements of renormalizing process and the trace anomaly subject. It is specifically debated that Krein construction does not destroy black holes thermodynamics.

H. Pejhan; S. Rahbardehghan

2014-08-19T23:59:59.000Z

424

Measured dose rate constant from oncology patients administered 18F for positron emission tomography  

SciTech Connect (OSTI)

Purpose: Patient exposure rate measurements verify published patient dose rate data and characterize dose rates near 2-18-fluorodeoxyglucose ({sup 18}F-FDG) patients. A specific dose rate constant based on patient exposure rate measurements is a convenient quantity that can be applied to the desired distance, injection activity, and time postinjection to obtain an accurate calculation of cumulative external radiation dose. This study reports exposure rates measured at various locations near positron emission tomography (PET) {sup 18}F-FDG patients prior to PET scanning. These measurements are normalized for the amount of administered activity, measurement distance, and time postinjection and are compared with other published data. Methods: Exposure rates were measured using a calibrated ionization chamber at various body locations from 152 adult oncology patients postvoid after a mean uptake time of 76 min following injection with a mean activity of 490 MBq {sup 18}F-FDG. Data were obtained at nine measurement locations for each patient: three near the head, four near the chest, and two near the feet. Results: On contact with, 30 cm superior to and 30 cm lateral to the head, the mean (75th percentile) dose rates per unit injected activity at 60 min postinjection were 0.482 (0.511), 0.135 (0.155), and 0.193 (0.223) {mu}Sv/MBq h, respectively. On contact with, 30 cm anterior to, 30 cm lateral to and 1 m anterior to the chest, the mean (75th percentile) dose rates per unit injected activity at 60 min postinjection were 0.623 (0.709), 0.254 (0.283), 0.190 (0.218), and 0.067 (0.081) {mu}Sv/MBq h respectively. 30 cm inferior and 30 cm lateral to the feet, the mean (75th percentile) dose rates per unit injected activity at 60 min postinjection were 0.024 (0.022) and 0.039 (0.044) {mu}Sv/MBq h, respectively. Conclusions: The measurements for this study support the use of 0.092 {mu}Sv m{sup 2}/MBq h as a reasonable representation of the dose rate anterior from the chest of patients immediately following injection. This value can then be reliably scaled to the desired time and distance for planning and staff dose evaluation purposes. At distances closer than 1 m, a distance-specific dose rate constant of 0.367 {mu}Sv/MBq h at 30 cm is recommended for accurate calculations. An accurate patient-specific dose rate constant that accounts for patient-specific variables (e.g., distribution and attenuation) will allow an accurate evaluation of the dose rate from a patient injected with an isotope rather than simply utilizing a physical constant.

Quinn, Brian; Holahan, Brian; Aime, Jean; Humm, John; St Germain, Jean; Dauer, Lawrence T. [Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, New York 10065 (United States); Department of Radiology, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, New York 10065 (United States); Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, New York 10065 (United States) and Department of Radiology, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, New York 10065 (United States); Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, New York 10065 (United States); Department of Medical Physics, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, New York 10065 (United States) and Department of Radiology, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, New York 10065 (United States)

2012-10-15T23:59:59.000Z

425

Precision physics of simple atoms: QED tests, nuclear structure and fundamental constants  

E-Print Network [OSTI]

Quantum electrodynamics is the first successful and still the most successful quantum field theory. Simple atoms, being essentially QED systems, allow highly accurate theoretical predictions. Because of their simple spectra, such atoms have been also efficiently studied experimentally frequently offering the most precisely measured quantities. Our review is devoted to comparison of theory and experiment in the field of precision physics of light simple atoms. In particular, we consider the Lamb shift in the hydrogen atom, the hyperfine structure in hydrogen, deuterium, helium-3 ion, muonium and positronium, as well as a number of other transitions in positronium. Additionally to a spectrum of unperturbed atoms, we consider annihilation decay of positronium and the g factor of bound particles in various two-body atoms. Special attention is paid to the uncertainty of the QED calculations due to the uncalculated higher-order corrections and effects of the nuclear structure. We also discuss applications of simple atoms to determination of several fundamental constants.

Savely G. Karshenboim

2005-09-01T23:59:59.000Z

426

Covariantly Constant Curvature Tensors and D=3, N=4, 5, 8 Chern-Simons Matter Theories  

E-Print Network [OSTI]

We construct some examples of D=3, N=4 GW theory and N=5 superconformal Chern-Simons matter theory by using the covariantly constant curvature of a quaternionic-Kahler manifold to construct the symplectic 3-algebra in the theories. Comparing with the previous theories, the N=4, 5 theories constructed in this way possess a local Sp(2n) symmetry and a diffeomorphism symmetry associated with the quaternionic-Kahler manifold. We also construct a generalized N=8 BLG theory by utilizing the dual curvature operator of a maximally symmetric space of dimension 4 to construct the Nambu 3-algebra. Comparing with the previous N=8 BLG theory, the theory has a diffeomorphism invariance and a local SO(4) invariance associated with the symmetric space.

Fa-Min Chen

2011-09-18T23:59:59.000Z

427

The reduced phase space of spherically symmetric Einstein-Maxwell theory including a cosmological constant  

E-Print Network [OSTI]

We extend here the canonical treatment of spherically symmetric (quantum) gravity to the most simple matter coupling, namely spherically symmetric Maxwell theory with or without a cosmological constant. The quantization is based on the reduced phase space which is coordinatized by the mass and the electric charge as well as their canonically conjugate momenta, whose geometrical interpretation is explored. The dimension of the reduced phase space depends on the topology chosen, quite similar to the case of pure (2+1) gravity. We investigate several conceptual and technical details that might be of interest for full (3+1) gravity. We use the new canonical variables introduced by Ashtekar, which simplifies the analysis tremendously.

T. Thiemann

1999-10-04T23:59:59.000Z

428

Reduced Phase Space Quantization of spherically symmetric Einstein-Maxwell-Theory including a cosmological constant  

E-Print Network [OSTI]

We present here the canonical treatment of spherically symmetric (quantum) gravity coupled to spherically symmetric Maxwell theory with or without a cosmological constant. The quantization is based on the reduced phase space which is coordinatized by the mass and the electric charge as well as their canonically conjugate momenta, whose geometrical interpretation is explored. The dimension of the reduced phase space depends on the topology chosen, quite similar to the case of pure (2+1) gravity. We also compare the reduced phase space quantization to the algebraic quantization. Altogether, we observe that the present model serves as an interesting testing ground for full (3+1) gravity. We use the new canonical variables introduced by Ashtekar which simplifies the analysis tremendously.

T. Thiemann

1999-10-04T23:59:59.000Z

429

Lattice constant and substitutional composition of GeSn alloys grown by molecular beam epitaxy  

SciTech Connect (OSTI)

Single crystal epitaxial Ge{sub 1?x}Sn{sub x} alloys with atomic fractions of tin up to x = 0.145 were grown by solid source molecular beam epitaxy on Ge (001) substrates. The Ge{sub 1?x}Sn{sub x} alloys formed high quality, coherent, strained layers at growth temperatures below 250 C, as shown by high resolution X-ray diffraction. The amount of Sn that was on lattice sites, as determined by Rutherford backscattering spectrometry channeling, was found to be above 90% substitutional in all alloys. The degree of strain and the dependence of the effective unstrained bulk lattice constant of Ge{sub 1?x}Sn{sub x} alloys versus the composition of Sn have been determined.

Bhargava, Nupur; Coppinger, Matthew; Prakash Gupta, Jay; Kolodzey, James [Department of Electrical and Computer Engineering, University of Delaware, Newark, Delaware 19716 (United States)] [Department of Electrical and Computer Engineering, University of Delaware, Newark, Delaware 19716 (United States); Wielunski, Leszek [Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854 (United States)] [Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854 (United States)

2013-07-22T23:59:59.000Z

430

Type-1.5 Superconductivity  

Science Journals Connector (OSTI)

We demonstrate the existence of a novel superconducting state in high quality two-component MgB2 single crystalline superconductors where a unique combination of both type-1 (?1/?11/2) superconductor conditions is realized for the two components of the order parameter. This condition leads to a vortex-vortex interaction attractive at long distances and repulsive at short distances, which stabilizes unconventional stripe- and gossamerlike vortex patterns that we have visualized in this type-1.5 superconductor using Bitter decoration and also reproduced in numerical simulations.

Victor Moshchalkov; Mariela Menghini; T. Nishio; Q. H. Chen; A. V. Silhanek; V. H. Dao; L. F. Chibotaru; N. D. Zhigadlo; J. Karpinski

2009-03-16T23:59:59.000Z

431

Models for Type I supernovae  

SciTech Connect (OSTI)

Two rather disjoint scenarios for Type I supernovae are presented. One is based upon mass accretion by a white dwarf in a binary system. The second involves a star having some 8 to 10 times the mass of the sun which may or may not be a solitary star. Despite the apparent dissimilarities in the models it may be that each occurs to some extent in nature for they both share the possibility of producing substantial quantities of /sup 56/Ni and explosions in stars devoid of hydrogen envelopes. These are believed to be two properties that must be shared by any viable Type I model.

Woosley, S.E.; Weaver, T.A.; Taam, R.E.

1980-06-17T23:59:59.000Z

432

Hydrogen and helium traces in type Ib-c supernovae  

E-Print Network [OSTI]

The spectroscopic properties of a selected optical photospheric spectra of core collapse supernovae (CCSNe) are investigated.Special attention is devoted to traces of hydrogen at early phases. The generated spectra are found to match the observed ones reasonably well, including a list of only 23 candidate ions. Guided by SN Ib 1990I, the observed trough near 6300\\AA is attributed to H$\\alpha$ in almost all Type Ib events, although in some objects it becomes too weak to be discernible, especially at later phases. Alternative line identifications are discussed. Differences in the way hydrogen manifests its presence within CCSNe are highlighted. In Type Ib SNe, the H$\\alpha$ contrast velocity (i.e. line velocity minus the photospheric velocity) seems to increase with time at early epochs, reaching values as high as 8000 km s$^{-1}$ around 15-20 days after maximum and then remains almost constant. The derived photospheric velocities, indicate a lower velocity for Type II SNe 1987A and 1999em as compared to SN Ic 1994I and SN IIb 1993J, while Type Ib events display a somewhat larger variation. The scatter, around day 20, is measured to be $\\sim$5000 km s$^{-1}$. Following two simple approaches, rough estimates of ejecta and hydrogen masses are given. A mass of hydrogen of approximately 0.02 $M_\\odot$ is obtained for SN 1990I, while SNe 1983N and 2000H ejected $\\sim$0.008 $M_\\odot$ and $\\sim$0.08 $M_\\odot$ of hydrogen, respectively. SN 1993J has a higher hydrogen mass, $\\sim 0.7$ $M_\\odot$ with a large uncertainty. A low mass and thin hydrogen layer with very high ejection velocities above the helium shell, is thus the most likely scenario for Type Ib SNe. Some interesting and curious issues relating to oxygen lines suggest future investigations.

A. Elmhamdi; I. J. Danziger; D. Branch; B. Leibundgut; E. Baron; R. P. Kirshner

2006-04-04T23:59:59.000Z

433

Bianchi type II brane-world cosmologies (U>~0)  

Science Journals Connector (OSTI)

The asymptotic properties of the Bianchi type II cosmological model in the brane-world scenario are investigated. The matter content is assumed to be a combination of a perfect fluid and a minimally coupled scalar field that is restricted to the brane. The isotropic brane-world solution is determined to represent the initial singularity in all brane-world cosmologies. Additionally, it is shown that it is the kinetic energy of the scalar field which dominates the initial dynamics in these brane-world cosmologies. It is important to note that the dynamics of these brane-world cosmologies is not necessarily asymptotic to general relativistic cosmologies to the future in the case of a zero four-dimensional cosmological constant.

R. J. van den Hoogen and J. Ibaez

2003-04-24T23:59:59.000Z

434

Fact #586: August 31, 2009 New Vehicle Fuel Economies by Vehicle Type  

Broader source: Energy.gov [DOE]

The average fuel economy for new cars climbed to over 30 miles per gallon (mpg) in 2008 while the average for new pickup trucks stayed around 20 mpg. For new vans and sport utility vehicles (SUVs)...

435

Dark fleshed varieties (Bing type) in regular type, light fleshed varieties (Rainier type) in italics Sweet Cherries  

E-Print Network [OSTI]

Dark fleshed varieties (Bing type) in regular type, light fleshed varieties (Rainier type and Royalton. For more information about these and other varieties, visit our web site at www

436

Type I background fields in terms of type IIB ones  

E-Print Network [OSTI]

We choose such boundary conditions for open IIB superstring theory which preserve N=1 SUSY. The explicite solution of the boundary conditions yields effective theory which is symmetric under world-sheet parity transformation $\\Omega:\\sigma\\to-\\sigma$. We recognize effective theory as closed type I superstring theory. Its background fields,beside known $\\Omega$ even fields of the initial IIB theory, contain improvements quadratic in $\\Omega$ odd ones.

B. Nikolic; B. Sazdovic

2008-04-16T23:59:59.000Z

437

Exploring QSAR Fundamentals and Applications in Chemistry and Biology, Volume 1. Hydrophobic, Electronic and Steric Constants, Volume 2 J. Am. Chem. Soc. 1995, 117, 9782  

Science Journals Connector (OSTI)

Exploring QSAR Fundamentals and Applications in Chemistry and Biology, Volume 1. Hydrophobic, Electronic and Steric Constants, Volume 2 J. ...

David Hoekman

1996-10-30T23:59:59.000Z

438

ted with the double exponential curves and their time constants are deduced to  

E-Print Network [OSTI]

such as CdS, CdSe and CdTe? Here we report, for the first time in lower dimensional systems, the observation structureresulting from n-type doping of the buffer layer. Its energy position agrees very well with energy level cal

Sipe,J. E.

439

Description of CBECS Building Types  

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

Energy Energy Consumption Survey (CBECS) > Description of Building Types Description of CBECS Building Types In the Commercial Buildings Energy Consumption Survey (CBECS), buildings are classified according to principal activity, which is the primary business, commerce, or function carried on within each building. Buildings used for more than one of the activities described below are assigned to the activity occupying the most floorspace at the time of the interview. Thus, a building assigned to a particular principal activity category may be used for other activities in a portion of its space or at some time during the year. In the 1999 and 2003 CBECS, respondents were asked to place their building into a sub-category that was a more specific activity than has been collected in prior surveys. This was done to ensure the quality of the data; after data collection, the subcategories were combined into these more general building categories, which are consistent with prior CBECS surveys.

440

Types of Fuel Cells | Department of Energy  

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

Fuel Cells Current Technology Types of Fuel Cells Types of Fuel Cells Fuel cells are classified primarily by the kind of electrolyte they employ. This classification...

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


441

Energy transport, overshoot, and mixing in the atmospheres of M-type main- and pre-main-sequence objects  

E-Print Network [OSTI]

We constructed hydrodynamical model atmospheres for mid M-type main-, as well as pre-main-sequence (PMS) objects. Despite the complex chemistry encountered in these cool atmospheres a reasonably accurate representation of the radiative transfer is possible, even in the context of time-dependent and three-dimensional models. The models provide detailed information about the morphology of M-type granulation and statistical properties of the convective surface flows. In particular, we determined the efficiency of the convective energy transport, and the efficiency of mixing by convective overshoot. The convective transport efficiency was expressed in terms of an equivalent mixing-length parameter alpha in the formulation of mixing-length theory (MLT) given by Mihalas (1978). Alpha amounts to values around 2 for matching the entropy of the deep, adiabatically stratified regions of the convective envelope, and lies between 2.5 and 3.0 for matching the thermal structure of the deep photosphere. For current spectral analysis of PMS objects this implies that MLT models based on alpha=2.0 overestimate the effective temperature by 100 K and surface gravities by 0.25 dex. The average thermal structure of the formally convectively stable layers is little affected by convective overshoot and wave heating, i.e., stays close to radiative equilibrium conditions. Our models suggest that the rate of mixing by convective overshoot declines exponentially with geometrical distance to the Schwarzschild stability boundary. It increases at given effective temperature with decreasing gravitational acceleration.

H. -G. Ludwig; F. Allard; P. H. Hauschildt

2006-08-12T23:59:59.000Z

442

ARRHENIUS MODEL FOR HIGH-TEMPERATURE GLASS VISCOSITY WITH A CONSTANT PRE-EXPONENTIAL FACTOR  

SciTech Connect (OSTI)

A simplified form of the Arrhenius equation, ln ? = A + B(x)/T, where ? is the viscosity, T the temperature, x the composition vector, and A and B the Arrhenius coefficients, was fitted to glass-viscosity data for the processing temperature range (the range at which the viscosity is within 1 to 103 Pa.s) while setting A = constant and treating B(x) as a linear function of mass fractions of major components. Fitting the Arrhenius equation to over 550 viscosity data of commercial glasses and approximately 1000 viscosity data of glasses for nuclear-waste glasses resulted in the A values of -11.35 and -11.48, respectively. The R2 value ranged from 0.92 to 0.99 for commercial glasses and was 0.98 for waste glasses. The Arrhenius models estimate viscosities for melts of commercial glasses containing 42 to 84 mass% SiO2 within the temperature range of 1100 to 1550C and viscosity range of 5 to 400 Pa.s and for waste glasses containing 32 to 60 mass% SiO2 within the temperature range of 850 to 1450C and viscosity range of 0.4 to 250 Pa.s.

Hrma, Pavel R.

2008-04-15T23:59:59.000Z

443

NASA's astonishing evidence that c is not constant: The pioneer anomaly  

E-Print Network [OSTI]

For over 20 years NASA has struggled to find an explanation to the Pioneer anomaly. Now it becomes clear the solution to the riddle is that they have uncovered evidence that c, the speed of light, is not quite a universal constant. Using J. C. Cure s hypothesis that the index of refraction is a function of the gravitational energy density of space and straightforward Newtonian mechanics, NASA s measurements provide compelling evidence that the speed of light depends on the inverse of the square root of the gravitational energy density of space. The magnitude of the Pioneer anomalous acceleration leads to the value of the primordial energy density of space due to faraway stars and galaxies: 1.0838. x 10^15 Joule/m3. A value which almost miraculously coincides with the same quantity: 1.09429 x 10^15 Joule/m3 derived by J. C. Cure from a completely different phenomenon: the bending of starlight during solar eclipses.

E. D. Greaves

2007-01-11T23:59:59.000Z

444

Unified expression for the rate constant of the bridged electron transfer derived by renormalization  

SciTech Connect (OSTI)

Electron transfer (ET) from a donor to an acceptor through an energetically close intermediary state on a midway molecule is a process found often in natural and artificial solar-energy capturing systems such as photosynthesis. This process has often been thought of in terms of opposing 'superexchange' and 'sequential or hopping' mechanisms, and the recent theory of Sumi and Kakitani (SK) [J. Phys. Chem. B 105, 9603 (2001)] has shown an interpolation between these mechanisms. In their theory, however, dynamics governing the most interesting intermediary region between them has artificially been introduced by phenomenologies. The dynamics is played by decoherence among electronic states, their decay, and thermalization of phonons in the medium. The present work clarifies the dynamics on a microscopic basis by means of renormalization in electronic coupling among the states, and gives a complete unified expression of the rate constant of the ET. It merges to that given by the SK theory in the semiclassical approximation for phonons interacting with an electron transferred.

Saito, Keisuke; Sumi, Hitoshi [Institute of Materials Science, University of Tsukuba, Tsukuba 305-8573 (Japan)

2009-10-07T23:59:59.000Z

445

The Meissner effect in the ground state of free charged Bosons in a constant magnetic field  

E-Print Network [OSTI]

The model of free charged Bosons in an external constant magnetic field inside a cylinder, one of the few locally gauge covariant systems amenable to analytic treatment, is rigorously investigated in the semiclassical approximation. The model was first studied by Schafroth and is suitable for the description of quasi-bound electron pairs localized in physical space, so-called Schafroth pairs, which occur in certain compounds, but he used perturbation theory on the magnetic field, which is not applicable to the homogeneous fields for which the thermodynamical results may be derived. A simple nonperturbative spectral argument shows that, for sufficiently low values of the magnetic field, the ground state expectation value of the current $$ is of the London form $ = -\\lambda(\\vec{x}) \\vec{A}(\\vec{x})$, with $\\lambda$ a positive function of $\\vec{x}$, $\\vec{A}$ denoting the magnetic vector potential. As a consequence, the magnetic induction inside the sample is given by a non-uniform field, monotonically decreasing from the surface. Under a plausible assumption on the ground state wave function, the Meissner effect is derived, and the results fit the thermodynamics calculated by Schafroth as a finite size correction. We also briefly review the link with relativistic quantum field theory, in particular with London-Schwinger screening.

Walter F. Wreszinski

2014-08-31T23:59:59.000Z

446

Feasibility study of volumetric modulated arc therapy with constant dose rate for endometrial cancer  

SciTech Connect (OSTI)

To investigate the feasibility, efficiency, and delivery accuracy of volumetric modulated arc therapy with constant dose rate (VMAT-CDR) for whole-pelvic radiotherapy (WPRT) of endometrial cancer. The nine-field intensity-modulated radiotherapy (IMRT), VMAT with variable dose-rate (VMAT-VDR), and VMAT-CDR plans were created for 9 patients with endometrial cancer undergoing WPRT. The dose distribution of planning target volume (PTV), organs at risk (OARs), and normal tissue (NT) were compared. The monitor units (MUs) and treatment delivery time were also evaluated. For each VMAT-CDR plan, a dry run was performed to assess the dosimetric accuracy with MatriXX from IBA. Compared with IMRT, the VMAT-CDR plans delivered a slightly greater V{sub 20} of the bowel, bladder, pelvis bone, and NT, but significantly decreased the dose to the high-dose region of the rectum and pelvis bone. The MUs decreased from 1105 with IMRT to 628 with VMAT-CDR. The delivery time also decreased from 9.5 to 3.2 minutes. The average gamma pass rate was 95.6% at the 3%/3 mm criteria with MatriXX pretreatment verification for 9 patients. VMAT-CDR can achieve comparable plan quality with significant shorter delivery time and smaller number of MUs compared with IMRT for patients with endometrial cancer undergoing WPRT. It can be accurately delivered and be an alternative to IMRT on the linear accelerator without VDR capability.

Yang, Ruijie [Department of Radiation Oncology, Peking University Third Hospital, Beijing (China); Wang, Junjie, E-mail: junjiewang47@yahoo.com [Department of Radiation Oncology, Peking University Third Hospital, Beijing (China); Xu, Feng [Department of Biomedical Engineering, Peking University Third Hospital, Beijing (China); Li, Hua [Department of Obstetrics and Gynecology, Peking University Third Hospital, Beijing (China); Zhang, Xile [Department of Radiation Oncology, Peking University Third Hospital, Beijing (China)

2013-10-01T23:59:59.000Z

447

Bohr - Planck quantum theory, (Tesla) magnetic monopoles and fine structure constant  

E-Print Network [OSTI]

In this work we apply Bohr-Planck (Old quantum atomic and radiation) theory, i.e. and quasi-classical methods for analysis of the magnetic monopoles and other problems. We reproduce exactly some basic elements of the Dirac magnetic monopoles theory, especially Dirac electric/magnetic charge quantization condition. Also, we suggest a new, effective, simply called Tesla model (for analogy with positions of the solenoids by Tesla inductive motor) of the magnetic monopole instead of usual effective Dirac model (half-infinite, very tinny solenoid) of the magnetic monopole. In our, i.e. Tesla model we use three equivalent tiny solenoids connected in series with a voltage source. One end of any solenoid is placed at the circumference of a circle and solenoids are directed radial toward circle center. Length of any solenoid is a bit smaller than finite circle radius so that other end of any solenoid is very close to the circle center. Angles between neighboring solenoids equal $120^{\\circ}$. All this implies that, practically, there is no magnetic field, or, magnetic pole, e.g. $S$, in the circle center, and that whole system holds only other, $N$ magnetic pole, at the ends of the solenoids at circle circumference. Finally, we reproduce relatively satisfactory value of the fine structure constant using Planck, i.e. Bose-Einstein statistics and Wien displacement law.

Vladan Pankovic; Darko V. Kapor; Stevica Djurovic; Miodrag Krmar

2014-10-17T23:59:59.000Z

448

New determination of the gravitational constant G with time-of-swing method  

SciTech Connect (OSTI)

A new determination of the Newtonian gravitational constant G is presented by using a torsion pendulum with the time-of-swing method. Compared with our previous measurement with the same method, several improvements greatly reduced the uncertainties as follows: (i) two stainless steel spheres with more homogeneous density are used as the source masses instead of the cylinders used in the previous experiment, and the offset of the mass center from the geometric center is measured and found to be much smaller than that of the cylinders; (ii) a rectangular glass block is used as the main body of the pendulum, which has fewer vibration modes and hence improves the stability of the period and reduces the uncertainty of the moment of inertia; (iii) both the pendulum and source masses are placed in the same vacuum chamber to reduce the error of measuring the relative positions; (iv) changing the configurations between the ''near'' and ''far'' positions is remotely operated by using a stepper motor to lower the environmental disturbances; and (v) the anelastic effect of the torsion fiber is first measured directly by using two disk pendulums with the help of a high-Q quartz fiber. We have performed two independent G measurements, and the two G values differ by only 9 ppm. The combined value of G is (6.673 49{+-}0.000 18)x10{sup -11} m{sup 3} kg{sup -1} s{sup -2} with a relative uncertainty of 26 ppm.

Tu Liangcheng; Li Qing; Wang Qinglan; Shao Chenggang; Yang Shanqing; Liu Linxia; Liu Qi; Luo Jun [Department of Physics, Huazhong University of Science and Technology, Wuhan 430074 (China)

2010-07-15T23:59:59.000Z

449

Determination of elastic properties and interatomic force constants using inelastic neutron scattering  

Science Journals Connector (OSTI)

Neutron scattering is the most powerful technique for measuring vibrational excitation spectra. With single?crystal samples the complete phonon dispersion relation can be measured. At small phonon wavelengths the slope of the dispersion curve is related directly to the elastic constants of the material. Information from shorter wavelength phonons can be used to determine parameters for interatomic force models or compared to first?principles calculations. Model parameters can then be used to calculate phonon densities?of?states and consequently connect to the thermodynamics. Polycrystalline samples yield less information but the data is directly related to the phonon density?of?states for Bravais lattices. Measurements on polycrystalline samples have the advantage of being fast and are more useful for parametric studies of the lattice dynamics (with temperature for example). These ideas will be used to discuss several interesting systems most notably Pu metal and Fe?Ga magnetostrictive alloys. [This work is supported by the U.S. Department of Energy.

2006-01-01T23:59:59.000Z

450

Infinite Randomness Expansion and Amplification with a Constant Number of Devices  

E-Print Network [OSTI]

We present a device-independent randomness expansion protocol, involving only a constant number of non-signaling quantum devices, that achieves \\emph{infinite expansion}: starting with $m$ bits of uniform private randomness, the protocol can produce an unbounded amount of certified randomness that is $\\exp(-\\Omega(m^{1/3}))$-close to uniform and secure against a quantum adversary. The only parameters which depend on the size of the input are the soundness of the protocol and the security of the output (both are inverse exponential in $m$). This settles a long-standing open problem in the area of randomness expansion and device-independence. The analysis of our protocols involves overcoming fundamental challenges in the study of \\emph{adaptive} device-independent protocols. Our primary technical contribution is the design and analysis of device-independent protocols which are \\emph{Input Secure}; that is, their output is guaranteed to be secure against a quantum eavesdropper, \\emph{even if the input randomness was generated by that same eavesdropper}! The notion of Input Security may be of independent interest to other areas such as device-independent quantum key distribution.

Matthew Coudron; Henry Yuen

2014-04-01T23:59:59.000Z

451

Measuring Boltzmanns constant with a low-cost atomic force microscope: An undergraduate experiment  

Science Journals Connector (OSTI)

We discuss a low-cost atomic force microscope that we have designed and built for use in an undergraduate teaching laboratory. This microscope gives students hands-on access to nano-Newton force measurements and subangstrom position measurements. The apparatus relies mainly on off-the-shelf components and utilizes an interferometric position sensor known as the interdigitated (ID) cantilever to obtain high resolution. The mechanical properties of the ID readout enable a robust and open design that makes it possible for students to directly control it. Its pedagogical advantage is that students interact with a complete instrument system and learn measurement principles in context. One undergraduate experiment enabled by this apparatus is a measurement of Boltzmanns constant which is done by recording the thermal noise power spectrum of a microfabricated cantilever beam. In addition to gaining an appreciation of the lower limits of position and force measurements students learn to apply numerous concepts such as digital sampling Fourier-domain analysis noise sources and error propagation.

M. Shusteff; T. P. Burg; S. R. Manalis

2006-01-01T23:59:59.000Z

452

From Unexpected Minkowskian Solution of General Relativity with Cosmological Constant to the Accelerating Universe  

E-Print Network [OSTI]

An unexpected Minkowskian solution of the equation of General Relativity (Einstein-1915) is trivial because it simply means that both members of the equation are equal to zero. However, if alternatively, one considers the complete equation with a non-zero (cosmological constant (Einstein-1917), a Minkowskian solution is no longer trivial because it amounts to impose a constraint on the right hand side of the equation (i.e. a non-null stress-energy tensor). If furthermore one identifies (as usual) this tensor to the one of a perfect fluid, one finds that this fluid has a positive energy density and a negative pressure. We discover finally an expanding Universal Minkowskian fluid (Flat Universe) that has not only dynamical properties (acceleration) but also optical properties that are connected with Doppler Redshift. Einstein special relativity in 1905 consisted in dissolving a ghost: the old electromagnetic ether; our relativistic approach involves also the dissolution of a ghost: the Dark Dnergy. This new cosmological ether becomes a pure relativistic effect of Minkowskian solution with CC.

Yves Pierseaux

2014-03-03T23:59:59.000Z

453

The $^3$He(e, e$'$d)p Reaction in q$?$-constant Kinematics  

E-Print Network [OSTI]

The cross section for the $^3$He(e, e$'$d)p reaction has been measured as a function of the missing momentum $p_m$ in q$\\omega$ -constant kinematics at beam energies of 370 and 576 MeV for values of the three-momentum transfer $q$ of 412, 504 and 604 \\mevc. The L(+TT), T and LT structure functions have been separated for $q$ = 412 and 504 \\mevc. The data are compared to three-body Faddeev calculations, including meson-exchange currents (MEC), and to calculations based on a covariant diagrammatic expansion. The influence of final-state interactions and meson-exchange currents is discussed. The $p_m$-dependence of the data is reasonably well described by all calculations. However, the most advanced Faddeev calculations, which employ the AV18 nucleon-nucleon interaction and include MEC, overestimate the measured cross sections, especially the longitudinal part, and at the larger values of $q$. The diagrammatic approach gives a fair description of the cross section, but under(over)estimates the longitudinal (transverse) structure function.

C. M. Spaltro; Th. S. Bauer; H. P. Blok; T. Botto; E. Cisbani; R. De Leo; G. E. Dodge; R. Ent; S. Frullani; F. Garibaldi; W. Gloeckle; J. Golak; M. N. Harakeh; M. Iodice; E. Jans; H. Kamada; W. J. Kasdorp; C. Kormanyos; L. Lapikas; A. Misiejuk; S. I. Nagorny; G. J. Nooren; C. J. G. Onderwater; R. Perrino; M. van Sambeek; R. Skibinski; R. Starink; G. van der Steenhoven; J. Tjon; M. A. van Uden; G. M. Urciuoli; H. de Vries; H. Witala; M. Yeomans

2002-01-21T23:59:59.000Z

454

Laser-assisted homogeneous charge ignition in a constant volume combustion chamber  

Science Journals Connector (OSTI)

Homogeneous charge compression ignition (HCCI) is a very promising future combustion concept for internal combustion engines. There are several technical difficulties associated with this concept, and precisely controlling the start of auto-ignition is the most prominent of them. In this paper, a novel concept to control the start of auto-ignition is presented. The concept is based on the fact that most HCCI engines are operated with high exhaust gas recirculation (EGR) rates in order to slow-down the fast combustion processes. Recirculated exhaust gas contains combustion products including moisture, which has a relative peak of the absorption coefficient around 3?m. These water molecules absorb the incident erbium laser radiations (?=2.79?m) and get heated up to expedite ignition. In the present experimental work, auto-ignition conditions are locally attained in an experimental constant volume combustion chamber under simulated EGR conditions. Taking advantage of this feature, the time when the mixture is thought to auto-ignite could be adjusted/controlled by the laser pulse width optimisation, followed by its resonant absorption by water molecules present in recirculated exhaust gas.

Dhananjay Kumar Srivastava; Martin Weinrotter; Henrich Kofler; Avinash Kumar Agarwal; Ernst Wintner

2009-01-01T23:59:59.000Z

455

A Relationship between the Comoving Particle Number and the Effective Cosmological Constant  

E-Print Network [OSTI]

In order to discuss and obtain the remaining inflaton potential, we introduced an idea called "effective static friction" in our last paper to balance the "force", $\\frac{dV}{d\\phi}|_{\\phi=\\phi(t_{rest})}$, of inflaton. According to this idea, we now discover that, after the course of particle creation, there will be a relationship between the final relativistic particle number inside an arbitrary chosen comoving volume $N_r(t_{rest})$ and the effective cosmological constant $\\Lambda$ in our Universe. This relationship can be expressed as $N_r(t_{rest})=(\\frac{\\ell^2m_\\phi^2\\Lambda}{4\\pi G\\sigma^2(t_{rest})})^{3/2}$ when we employ the classical chaotic model, $V(\\phi)=1/2m_{\\phi}^2\\phi^2$, and consider that $\\phi$ comes to rest at $t_{rest}$. Moreover, we obtain an evolution equation for the particle number ($N_r(t)$) inside the comoving volume. Meanwhile, a new inflaton field equation which contains parameters of $N_r(t)$ and "particle creation coefficients" can also be found. Importantly, the results illustrate the fact that $\\Lambda$ and $N_r$ are the results of probability.

Yu-chung Chen

2012-04-30T23:59:59.000Z

456

Evaluation and Application of the Constant Flow Technique in Testing Low-Permeability Geo-Materials  

SciTech Connect (OSTI)

Safety assessment of facilities involved in geological disposal of hazardous waste, including radioactive nuclear waste, is generally performed through mass transport simulations combined with uncertainty and sensitivity analyses. Transport of contaminants, such as radionuclides, through an engineered and/or natural barrier system is mainly controlled by advection, dispersion, sorption, and chain decay. Ideally, waste disposal facilities should be constructed in the geological environments where groundwater is not existent, or groundwater is static, or its flow is extremely slow. Potential fluid flow, however, may be induced by thermal convection and/or gas generation, and thus accurate evaluation of hydraulic properties, specifically the permeability and specific storage, along with diffusive transport properties of engineered and natural barrier materials, is of fundamental importance for safety assessment. The engineered and natural barrier materials for isolating hazardous wastes are hydraulically tight, and special techniques are generally required to obtain both rapid and accurate determination of their hydraulic properties. In this paper, the constant flow technique is introduced and evaluated. The capability of this technique in testing low-permeability geo-materials are illustrated through practical applications to a bentonite-sand mixture and rock samples having low permeabilities. (authors)

Nakajima, H.; Takeda, M.; Zhang, M. [National Institute of Advanced Industrial Science and Technology (AIST), Research Center for Deep Geological Environments, Tsukuba, Ibaraki (Japan)

2007-07-01T23:59:59.000Z

457

Growth of monodisperse mesoscopic metal-oxide colloids under constant monomer supply  

Science Journals Connector (OSTI)

In closed systems, control over the size of monodisperse metal-oxide colloids is generally limited to submicrometric dimensions. To overcome this difficulty, we explore the formation and growth of silica particles under constant monomer supply. The monomer source is externally driven by the progressive addition into the system of one of the precursors. Monodisperse spherical particles are produced up to a mesoscopic size. We analyze their growth versus the monomer addition rate at different temperatures. Our results show that in the presence of a continuous monomer addition, growth is limited by diffusion over the investigated temporal window. Using the temperature variation of the growth rate, we prove that rescaling leads to a data reduction onto a single master curve. Contrary to the growth process, the final particles size reached after the end of the reagent supply strongly depends on the addition rate. The variation of the final particle size versus addition rate can be deduced from an analogy with crystal formation in jet precipitation. Within this framework, and using the temperature dependences of both the particle growth law and the final size, we determine the value of the molecular heat of dissolution associated to the silica solubility. These observations support the fact that classical theories of phase-ordering dynamics can be extended to the synthesis of inorganic particles. The emergence of a master behavior in the presence of continuous monomer addition also suggests the extension of these theories to open systems.

Koh Nozawa; Marie-Hlne Delville; Hideharu Ushiki; Pascal Panizza; Jean-Pierre Delville

2005-07-11T23:59:59.000Z

458

Diffraction Profiles of Elasticity Bent Single Crystals with Constant Strain Gradients  

SciTech Connect (OSTI)

This work presents a set of equations that can be used to predict the dynamical diffraction profile from a non-transparent single crystal with a constant strain gradient examined in Bragg reflection geometry with a spherical incident X-ray beam. In agreement with previous work, the present analysis predicts two peaks: a primary diffraction peak, which would have still been observed in the absence of the strain gradient and which exits the specimen surface at the intersection point of the incident beam with the sample surface, and a secondary (mirage) peak, caused by the deflection of the wavefield within the material, which exits the specimen surface further from this intersection point. The integrated intensity of the mirage peak increases with increasing strain gradient, while its separation from the primary reflection peak decreases. The directions of the rays forming the mirage peak are parallel to those forming the primary diffraction peak. However, their spatial displacement might cause (fictitious) angular shifts in diffractometers equipped with area detectors or slit optics. The analysis results are compared with experimental data from an Si single-crystal strip bent in cantilever configuration, and the implications of the mirage peak for Laue analysis and high-precision diffraction measurements are discussed.

Yan,H.; Kalenci, O.; Noyan, I.

2007-01-01T23:59:59.000Z

459

Electron affinity of Pa by 7p attachment and hyperfine structure constants for Pa-  

Science Journals Connector (OSTI)

Valence shell relativistic configuration interaction calculations for the 7p attachment to the Pa I ground state yield one bound state, viz., Pa- 5f26d7s27p J=6, with electron affinity of 0.222 eV. We found no other Js for this configuration to be bound, nor are any of the Pa- 5f26d27s2 levels expected to be bound. The hyperfine structure constants for the Pa-231 bound state are A=741.3 MHz and B=1309 MHz. Although the core-valence correlation effects are absent the agreement between the theory (4736 cm-1) and experiment (4121 cm-1) for the position of the first excited state of Pa is good (15%). We review our previous studies for the np attachment in rare earths to systematically analyze the binding of np1/2 and np3/2 electrons, in these species. 1996 The American Physical Society.

Konstantin D. Dinov and Donald R. Beck

1996-06-01T23:59:59.000Z

460

Improved electronic measurement of the Boltzmann constant by Johnson noise Thermometry  

E-Print Network [OSTI]

The unit of thermodynamic temperature, the kelvin, will be redefined in 2018 by fixing the value of the Boltzmann constant, k. The present CODATA recommended value of k is determined predominantly by acoustic gas-thermometry results. To provide a value of k based on different physical principles, purely electronic measurements of k were performed by using a Johnson noise thermometer to compare the thermal noise power of a 200 Ohm sensing resistor immersed in a triple-point-of-water cell to the noise power of a quantum-accurate pseudo-random noise waveform of nominally equal noise power. Measurements integrated over a bandwidth of 550 kHz and a total integration time of 33 days gave a measured value of k = 1.3806514(48)x10^-23 J/K, for which the relative standard uncertainty is 3.5x10^-6 and the relative offset from the CODATA 2010 value is +1.9x10^-6.

Qu, Jifeng; Pollarolo, Alessio; Rogalla, Horst; Tew, Weston L; White, Rod; Zhou, Kunli

2015-01-01T23:59:59.000Z

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461

On variations in the fine-structure constant and stellar pollution of quasar absorption systems  

E-Print Network [OSTI]

At redshifts z_abs < 2, quasar absorption-line constraints on space-time variations in the fine-structure constant, alpha, rely on the comparison of MgII and FeII transition wavelengths. One potentially important uncertainty is the relative abundance of Mg isotopes in the absorbers which, if different from solar, can cause spurious shifts in the measured wavelengths and, therefore, alpha. Here we explore chemical evolution models with enhanced populations of intermediate-mass (IM) stars which, in their asymptotic giant branch (AGB) phase, are thought to be the dominant factories for heavy Mg isotopes at the low metallicities typical of quasar absorption systems. By design, these models partially explain recent Keck/HIRES evidence for a smaller alpha in z_abs < 2 absorption clouds than on Earth. However, such models also over-produce N, violating observed abundance trends in high-z_abs damped Lyman-alpha systems (DLAs). Our results do not support the recent claim of Ashenfelter, Mathews & Olive (2004b) that similar models of IM-enhanced initial mass functions (IMFs) may simultaneously explain the HIRES varying-alpha data and DLA N abundances. We explore the effect of the IM-enhanced model on Si, Al and P abundances, finding it to be much-less pronounced than for N. We also show that the 13C/12C ratio, as measured in absorption systems, could constitute a future diagnostic of non-standard models of the high-redshift IMF.

Y. Fenner; M. T. Murphy; B. K. Gibson

2005-01-10T23:59:59.000Z

462

Lie racks of type D: Unipotent conjugacy classes in finite groups of Lie type Lie racks of type D  

E-Print Network [OSTI]

Lie racks of type D: Unipotent conjugacy classes in finite groups of Lie type Lie racks of type D de C´ordoba, Argentina CIEM-CONICET CMS Summer Meeting June 2-4, 2012, Regina, Canada #12;Lie racks. Andruskiewitsch and G. Carnovale. #12;Lie racks of type D: Unipotent conjugacy classes in finite groups of Lie

Argerami, Martin

463

Air temperature effect on thermal models for ventilated dry-type transformers  

Science Journals Connector (OSTI)

The temperature of the air surrounding the windings of ventilated dry-type transformers is an important factor in the cooling of the windings since they are cooled only by the air. In particular, inner windings are sensitive to the air temperature in vertical cooling ducts. This study presents air temperature effect on the temperatures in foil-type inner winding for the dry-type transformers. A transformer rated at 2000kVA was selected for the research and temperature distribution was calculated under constant and varying air temperatures inside vertical ducts at three different loads. The 2-D transient heat diffusion equation was solved using the finite element method by coupling it with the vector potential equation due to non-uniformly generated heat caused by eddy currents in the foil winding. The calculated temperatures at constant and varying air temperatures are presented together with experimental values. The numerical and experimental results of this study showed that the air temperature affects the accuracy of temperatures in foil-type inner winding greatly.

Moonhee Lee; Hussein A. Abdullah; Jan C. Jofriet; Dhiru Patel; Murat Fahrioglu

2011-01-01T23:59:59.000Z

464

A quantum mechanical relation connecting time, temperature, and cosmological constant of the universe: Gamow's relation revisited as a special case  

E-Print Network [OSTI]

Considering our expanding universe as made up of gravitationally interacting particles which describe particles of luminous matter and dark matter and dark energy which is described by a repulsive harmonic potential among the points in the flat 3-space, we derive a quantum mechanical relation connecting, temperature of the cosmic microwave background radiation, age, and cosmological constant of the universe. When the cosmological constant is zero, we get back the Gamow's relation with a much better coefficient. Otherwise, our theory predicts a value of the cosmological constant $2.234 10^{-56} {\\rm {cm^{-2}}}$ when the present values of cosmic microwave background temperature of 2.728 K and age of the universe 14 billion years are taken as input.

Mishra, S

2007-01-01T23:59:59.000Z

465

Formulation of the MFS for the two-dimensional Laplace equation with an added constant and constraint  

Science Journals Connector (OSTI)

Abstract Motivated by the incompleteness of single-layer potential approach for the interior problem with a degenerate-scale domain and the exterior problem with bounded potential at infinity, we revisit the method of fundamental solutions (MFS). Although the MFS is an easy method to implement, it is not complete for solving not only the interior 2D problem in case of a degenerate scale but also the exterior problem with bounded potential at infinity for any scale. Following Fichera?s idea for the boundary integral equation, we add a free constant and an extra constraint to the traditional MFS. The reason why the free constant and extra constraints are both required is clearly explained by using the degenerate kernel for the closed-form fundamental solution. Since the range of the single-layer integral operator lacks the constant term in the case of a degenerate scale for a two dimensional problem, we add a constant to provide a complete base. Due to the rank deficiency of the influence matrix in the case of a degenerate scale, we can promote the rank by simultaneously introducing a constant term and adding an extra constraint to enrich the MFS. For an exterior problem, the fundamental solution does not contain a constant field in the degenerate kernel expression. To satisfy the bounded potential at infinity, the sum of all source strengths must be zero. The formulation of the enriched MFS can solve not only the degenerate-scale problem for the interior problem but also the exterior problem with bounded potential at infinity. Finally, three examples, a circular domain, an infinite domain with two circular holes and an eccentric annulus were demonstrated to see the validity of the enriched MFS.

Jeng-Tzong Chen; Jheng-Lin Yang; Ying-Te Lee; Yu-Lung Chang

2014-01-01T23:59:59.000Z

466

Interaction of carbon dioxide laser radiation with a nanotube array in the presence of a constant electric field  

SciTech Connect (OSTI)

The dependence of the current density on the leading edge width of the alternating (high-frequency) field amplitude is studied at various constant (or unsteady) fields. The dependence of amplified microwaves in the two-millimeter range on a longitudinal coordinate is determined. The problem of submillimeter radiation generation in a system of parallel carbon nanotubes exposed to two-frequency carbon dioxide (CO{sub 2} laser) laser radiation in the presence of a constant (or unsteady) field is studied. The possibility of using freely oriented carbon nanotubes parallel to each other is shown.

Sadykov, N. R., E-mail: n.r.sadykov@rambler.ru [Branch of South Ural State University (Russian Federation); Scorkin, N. A. [Snezhinsk Physics and Technology Institute of the National Research Nuclear University 'MEPhI' (Russian Federation)

2012-06-15T23:59:59.000Z

467

Method for determination of heterogeneous rate constants at carbon-fibre microelectrodes using multi-ac-voltammetry  

Science Journals Connector (OSTI)

A state-of-the-art FFT-instrument recently described in this journal (which measures the impedance at each dc potential applied to a working electrode) was shown to perform with excellent precision in a kinetic study at a carbon fibre microelectrode. A constant phase element (CPE) was used in a model in order to correct for double layer effects arising at the carbon fibre microelectrode (?11 ?m). This simple model in combination with the data collected by the FFT-instrument were then used in order to determine the heterogeneous rate constant for a well-defined red/ox couple. Good agreement with previously published values was obtained.

Magnus Rosvall

2000-01-01T23:59:59.000Z

468

Wheel-type magnetic refrigerator  

DOE Patents [OSTI]

The disclosure is directed to a wheel-type magnetic refrigerator capable of cooling over a large temperature range. Ferromagnetic or paramagnetic porous materials are layered circumferentially according to their Curie temperature. The innermost layer has the lowest Curie temperature and the outermost layer has the highest Curie temperature. The wheel is rotated through a magnetic field perpendicular to the axis of the wheel and parallel to its direction of rotation. A fluid is pumped through portions of the layers using inner and outer manifolds to achieve refrigeration of a thermal load. 7 figs.

Barclay, J.A.

1983-10-11T23:59:59.000Z

469

Spatial Data Types: Conceptual Foundation for  

E-Print Network [OSTI]

Spatial Data Types: Conceptual Foundation for the Design and Implementation of Spatial Database markus.schneider@fernuni-hagen.de #12;Markus Schneider, Tutorial "Spatial Data Types" 2 Abstract Spatial are usually called spatial data types, such as point, line, and region but also include more complex types

Güting, Ralf Hartmut

470

Property:ProjectType | Open Energy Information  

Open Energy Info (EERE)

ProjectType ProjectType Jump to: navigation, search Property Name ProjectType Property Type Page Description A descriptive type for a project. This property uses pages as for its values, each of which should describe the type in detail. Pages using the property "ProjectType" Showing 25 pages using this property. (previous 25) (next 25) A Akutan Geothermal Project + Hydrothermal System + Alligator Geothermal Geothermal Project + Hydrothermal System + Alum Geothermal Project + Hydrothermal System + Aurora Geothermal Project + Hydrothermal System + B Bald Mountain Geothermal Project + Hydrothermal System + Baltazor Springs Geothermal Project + Hydrothermal System + Barren Hills Geothermal Project + Hydrothermal System + Black Rock I Geothermal Project + Hydrothermal System +

471

Federal Energy Management Program: Lighting Control Types  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Lighting Control Lighting Control Types to someone by E-mail Share Federal Energy Management Program: Lighting Control Types on Facebook Tweet about Federal Energy Management Program: Lighting Control Types on Twitter Bookmark Federal Energy Management Program: Lighting Control Types on Google Bookmark Federal Energy Management Program: Lighting Control Types on Delicious Rank Federal Energy Management Program: Lighting Control Types on Digg Find More places to share Federal Energy Management Program: Lighting Control Types on AddThis.com... Energy-Efficient Products Federal Requirements Covered Product Categories Product Designation Process Low Standby Power Energy & Cost Savings Calculators Model Acquisitions Language Working Group Resources Technology Deployment Renewable Energy

472

Corrosion in low dielectric constant Si-O based thin films: Buffer concentration effects  

SciTech Connect (OSTI)

Organosilicate glass (OSG) is often used as an interlayer dielectric (ILD) in high performance integrated circuits. OSG is a brittle material and prone to stress-corrosion cracking reminiscent of that observed in bulk glasses. Of particular concern are chemical-mechanical planarization techniques and wet cleans involving solvents commonly encountered in microelectronics fabrication where the organosilicate film is exposed to aqueous environments. Previous work has focused on the effect of pH, surfactant, and peroxide concentration on the subcritical crack growth of these films. However, little or no attention has focused on the effect of the conjugate acid/base concentration in a buffer. Accordingly, this work examines the strength of the buffer solution in both acidic and basic environments. The concentration of the buffer components is varied keeping the ratio of acid/base and therefore pH constant. In addition, the pH was varied by altering the acid/base ratio to ascertain any additional effect of pH. Corrosion tests were conducted with double-cantilever beam fracture mechanics specimens and fracture paths were verified with ATR-FTIR. Shifts in the threshold fracture energy, the lowest energy required for bond rupture in the given environment, G{sub TH}, were found to shift to lower values as the concentration of the base in the buffer increased. This effect was found to be much larger than the effect of the hydroxide ion concentration in unbuffered solutions. The results are rationalized in terms of the salient chemical bond breaking process occurring at the crack tip and modeled in terms of the chemical potential of the reactive species.

Zeng, F. W.; Lane, M. W., E-mail: mlane@ehc.edu [Department of Chemistry, Emory and Henry College, Emory, Virginia 24340 (United States); Gates, S. M. [IBM TJ Watson Research Center, Yorktown Heights, New York 10598 (United States)] [IBM TJ Watson Research Center, Yorktown Heights, New York 10598 (United States)

2014-05-15T23:59:59.000Z

473

Regulating the infrared by mode matching: A massless scalar in expanding spaces with constant deceleration  

E-Print Network [OSTI]

In this paper we consider a massless scalar field, with a possible coupling $\\xi$ to the Ricci scalar in a $D$ dimensional FLRW spacetime with a constant deceleration parameter $q=\\epsilon-1$, $\\epsilon=-{\\dot{H}}/{H^2}$. Correlation functions for the Bunch-Davies vacuum of such a theory have long been known to be infrared divergent for a wide range of values of $\\epsilon$. We resolve these divergences by explicitly matching the spacetime under consideration to a spacetime without infrared divergencies. Such a procedure ensures that all correlation functions with respect to the vacuum in the spacetime of interest are infrared finite. In this newly defined vacuum we construct the coincidence limit of the propagator and as an example calculate the expectation value of the stress energy tensor. We find that this approach gives both in the ultraviolet and in the infrared satisfactory results. Moreover, we find that, unless the effective mass due to the coupling to the Ricci scalar $\\xi R$ is negative, quantum contributions to the energy density always dilute away faster, or just as fast, as the background energy density. Therefore, quantum backreaction is insignificant at the one loop order, unless $\\xi R$ is negative. Finally we compare this approach with known results where the infrared is regulated by placing the Universe in a finite box. In an accelerating universe, the results are qualitatively the same, provided one identifies the size of the Universe with the physical Hubble radius at the time of the matching. In a decelerating universe however, the two schemes give different late time behavior for the quantum stress energy tensor. This happens because in this case the length scale at which one regulates the infrared becomes sub-Hubble at late times.

T. M. Janssen; T. Prokopec

2009-06-03T23:59:59.000Z

474

Extended Constant Power Speed Range of the Brushless DC Motor Through Dual Mode Inverter Control  

SciTech Connect (OSTI)

The trapezoidal back electromotive force (emf) brushless direct current (dc) motor (BDCM) with surface-mounted magnets has high-power density and efficiency especially when rare-earth magnet materials are used. Traction applications, such as electric vehicles, could benefit significantly from the use of such motors. Unfortunately, a practical means for driving the motor over a constant power speed ratio (CPSR) of 5:1 or more has not yet been developed. A key feature of these motors is that they have low internal inductance. The phase advance method is effective in controlling the motor power over such a speed range, but the current at high speed may be several times greater than that required at the base speed. The increase in current during high-speed operation is due to the low motor inductance and the action of the bypass diodes of the inverter. The use of such a control would require increased current rating of the inverter semiconductors and additional cooling for the inverter, where the conduction losses increase proportionally with current, and especially for the motor, where the losses increase with the square of the current. The high current problems of phase advance can be mitigated by adding series inductance; however, this reduces power density, requires significant increase in supply voltage, and leaves the CPSR performance of the system highly sensitive to variations in the available voltage. A new inverter topology and control scheme has been developed that can drive low-inductance BDCMs over the CPSR that would be required in electric vehicle applications. This new controller is called the dual-mode inverter control (DMIC). It is shown that the BDCM has an infinite CPSR when it is driven by the DMIC.

Lawler, J.S.

2000-06-23T23:59:59.000Z

475

An Introduction to Type Theory Dan Christensen  

E-Print Network [OSTI]

: Type a : A B : Type inl(a) : A + B A : Type b : B inr(b) : A + B C : Type p : A + B , x : A cA : C , y : B cB : C case(p, cA, cB) : C C : Type a : A , x : A cA : C , y : B cB : C case(inl(a), c

Christensen, Dan

476

Ignition quality determination of diesel fuels from hydrogen type distribution of hydrocarbons  

SciTech Connect (OSTI)

Hydrogen types of diesel like hydrocarbon fuels which have dominant effect on the ignition quality have been identified. A scheme of characterizing the chemistry of hydrocarbon fuels in terms of these hydrogen types using proton nuclear resonance spectrometry has been proposed. Using this analysis technique on 70 different diesel fuels, whose cetane numbers were determined on a number of standard cetane rating engines, an empirical expression which relates the ignition quality to the hydrogen type distribution of the fuels has been developed. The developed expression and the relationship between the ignition delay and cetane number imply that the effective activation energy term in the usual semiempirical ignition delay expression is not a constant for a given fuel but is a function of pressure and temperature as well as the fuel chemistry.

Gulder, O.L.; Glavincevski, B.

1986-02-01T23:59:59.000Z

477

Generation of electromagnetic radiation based on nanotubes under a constant electric field and an electromagnetic wave field  

SciTech Connect (OSTI)

The possible generation of radiation in the millimeter range based on nanotubes by an alternating (rapidly oscillating) electric field under a constant (or nonstationary) electric field is studied. Radiation enhancement is based on a periodic dependence of the current in nanotubes in such electric fields. The results of a mathematical simulation are presented.

Sadykov, N. R., E-mail: sadykov@rambler.ru; Scorkin, N. A. [South Ural State University (Russian Federation)

2012-02-15T23:59:59.000Z

478

Intervening sequences divide the gene for the constant region of mouse immunoglobulin mu chains into segments, each encoding a domain  

Science Journals Connector (OSTI)

...mouse Au constant region (25). We prepared restriction frag- merits of the cloned cDNA as probes for specific portions of the V...provided a 3'-Cg specific probe. Fragments were labeled by nick translation (31). E L H76 NW *0 -12.5 -10 ,W - 7...

N M Gough; D J Kemp; B M Tyler; J M Adams; S Cory

1980-01-01T23:59:59.000Z

479

Interaction potential for silicon carbide: A molecular dynamics study of elastic constants and vibrational density of states for crystalline  

E-Print Network [OSTI]

Interaction potential for silicon carbide: A molecular dynamics study of elastic constants and vibrational density of states for crystalline and amorphous silicon carbide Priya Vashishta,a Rajiv K. Kalia Silicon carbide SiC has been proposed for a wide range of technological applications

Southern California, University of

480

Optical properties of silicon carbide for astrophysical applications I. New laboratory infrared reflectance spectra and optical constants  

E-Print Network [OSTI]

Silicon Carbide (SiC) optical constants are fundamental inputs for radiative transfer models of astrophysical dust environments. However, previously published values contain errors and do not adequately represent the bulk physical properties of the cubic (beta) SiC polytype usually found around carbon stars. We provide new, uncompromised optical constants for beta- and alpha-SiC derived from single-crystal reflectance spectra and investigate quantitatively whether there is any difference between alpha- and beta-SiC that can be seen in infrared spectra and optical functions. Previous optical constants for SiC do not reflect the true bulk properties, and they are only valid for a narrow grain size range. The new optical constants presented here will allow narrow constraints to be placed on the grain size and shape distribution that dominate in astrophysical environments. In addition, our calculated absorption coefficients are much higher than laboratory measurements, which has an impact on the use of previous data to constrain abundances of these dust grains.

K. M. Pitman; A. M. Hofmeister; A. B. Corman; A. K. Speck

2008-03-10T23:59:59.000Z

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481

EQUATION OF FORCE OF GRAVITY DERIVED FROM THE AREA OF PLANCK INVARIANCE UNUSED UNIVERSAL GRAVITATIONAL CONSTANT OF  

E-Print Network [OSTI]

with entropy the energy sector flow (2). Erik Verlinde published on January 6, 2010, his work "On the Origin, to make it compatible with the law of conservation of energy and principles of general covariance the energy- momentum tensor, but fails to integrate into said Energy-Momentum Tensor the constant Universal

482

1262 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 18, NO. 6, NOVEMBER 2003 A Constant-Power Battery Charger With Inherent  

E-Print Network [OSTI]

1262 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 18, NO. 6, NOVEMBER 2003 A Constant-Power Battery. Pong, Senior Member, IEEE, and Chi K. Tse, Senior Member, IEEE Abstract--A battery charging circuit power throughout the charging process, the cir- cuit reduces the size of thermal installation which

Tse, Chi K. "Michael"

483

Group solution for unsteady free-convection flow from a vertical moving plate subjected to constant heat flux  

Science Journals Connector (OSTI)

The problem of heat and mass transfer in an unsteady free-convection flow over a continuous moving vertical sheet in an ambient fluid is investigated for constant heat flux using the group theoretical method. The nonlinear coupled partial differential ... Keywords: 22E05, 35Q53, 54H15, Free convective flow, Group theoretic method, Prandtl number, Thermal boundary layer

M. Kassem

2006-03-01T23:59:59.000Z

484

Integration of Miniaturized Patch Antennas with High Dielectric-Constant Multilayer Packages and Soft-and-Hard Surfaces (SHS)  

E-Print Network [OSTI]

Integration of Miniaturized Patch Antennas with High Dielectric-Constant Multilayer Packages) is employed to suppress the surface wave generated by a patch antenna integrated with high dielectric capability of the SHS in surface-wave suppression. The first is a stacked patch antenna on a large

Tentzeris, Manos

485

Bubble growth in slightly supersaturated albite melt at constant pressure Don R. Baker a,*, Phyllis Lang b  

E-Print Network [OSTI]

Bubble growth in slightly supersaturated albite melt at constant pressure Don R. Baker a,*, Phyllis July 2005; accepted in revised form 11 January 2006 Abstract Bubble growth experiments were performed.5 or $1.5 wt.% H2O, respectively, which caused rapid exsolution and bubble growth. Results at 1200 °C

Long, Bernard

486

Search for variation of fundamental constants: Strong enhancements in $X^2\\Pi$ cations of dihalogens and hydrogen halides  

E-Print Network [OSTI]

We propose to use diatomic molecular ions to search for strongly enhanced effects of variation of fundamental constants. The relative enhancement occurs in transitions between nearly degenerate levels of different nature. Since the trapping techniques for molecular ions have already been developed, the molecules HBr$^+$, HI$^+$, Br$^+_2$, I$^+_2$, IBr$^+$, ICl$^+$, and IF$^+$ are very promising candidates for such future studies.

Pasteka, L F; Flambaum, V V; Schwerdtfeger, P

2015-01-01T23:59:59.000Z

487

Hydrogen in Type Ic Supernovae?  

E-Print Network [OSTI]

By definition, a Type Ic supernova (SN Ic) does not have conspicuous lines of hydrogen or helium in its optical spectrum. SNe Ic usually are modelled in terms of the gravitational collapse of bare carbon-oxygen cores. We consider the possibility that the spectra of ordinary (SN 1994I-like) SNe Ic have been misinterpreted, and that SNe Ic eject hydrogen. An absorption feature usually attributed to a blend of Si II 6355 and C II 6580 may be produced by H-alpha. If SN 1994I-like SNe Ic eject hydrogen, the possibility that hypernova (SN 1998bw-like) SNe Ic, some of which are associated with gamma-ray bursts, also eject hydrogen should be considered. The implications of hydrogen for SN Ic progenitors and explosion models are briefly discussed.

David Branch; David J. Jeffery; Timothy R. Young; E. Baron

2006-05-09T23:59:59.000Z

488

Type C: Caldera Resource | Open Energy Information  

Open Energy Info (EERE)

C: Caldera Resource C: Caldera Resource Jump to: navigation, search GEOTHERMAL ENERGYGeothermal Home Print PDF Type C: Caldera Resource Dictionary.png Type C: Caldera Resource: No definition has been provided for this term. Add a Definition Brophy Occurrence Models This classification scheme was developed by Brophy, as reported in Updating the Classification of Geothermal Resources. Type A: Magma-heated, Dry Steam Resource Type B: Andesitic Volcanic Resource Type C: Caldera Resource Type D: Sedimentary-hosted, Volcanic-related Resource Type E: Extensional Tectonic, Fault-Controlled Resource Type F: Oceanic-ridge, Basaltic Resource Caldera resources may be found in many tectonic settings but are defined by their caldera structures which control the flow of the fluids in the system.

489

New approaches for modeling type Ia supernovae  

E-Print Network [OSTI]

ich and J. Stein. On the thermonuclear runaway in Type IaSmall-Scale Stability of Thermonuclear Flames o in Type IaS. E. Woosley. The thermonuclear explosion of chandrasekhar

Zingale, Michael; Almgren, Ann S.; Bell, John B.; Day, Marcus S.; Rendleman, Charles A.; Woosley, Stan

2007-01-01T23:59:59.000Z

490

Archive Reference Buildings by Building Type: Warehouse  

Broader source: Energy.gov [DOE]

Here you will find past versions of the reference buildings for new construction commercial buildings, organized by building type and location. A summary of building types and climate zones is...

491

Archive Reference Buildings by Building Type: Supermarket  

Broader source: Energy.gov [DOE]

Here you will find past versions of the reference buildings for new construction commercial buildings, organized by building type and location. A summary of building types and climate zones is...

492

EFRT M-12 Issue Resolution: Caustic Leach Rate Constants from PEP and Laboratory-Scale Tests  

SciTech Connect (OSTI)

Testing Summary Pacific Northwest National Laboratory (PNNL) has been tasked by Bechtel National Inc. (BNI) on the River Protection Project-Hanford Tank Waste Treatment and Immobilization Plant (RPP-WTP) project to perform research and development activities to resolve technical issues identified for the Pretreatment Facility (PTF). The Pretreatment Engineering Platform (PEP) was designed and constructed and is to be operated as part of a plan to respond to issue M12, Undemonstrated Leaching Processes. The PEP is a 1/4.5-scale test platform designed to simulate the WTP pretreatment caustic leaching, oxidative leaching, ultrafiltration solids concentration, and slurry washing processes. The PEP replicates the WTP leaching processes using prototypic equipment and control strategies. The PEP also includes non-prototypic ancillary equipment to support the core processing. Two operating scenarios are currently being evaluated for the ultrafiltration process (UFP) and leaching operations. The first scenario has caustic leaching performed in the UFP-2 ultrafiltration feed vessels (i.e., vessel UFP-VSL-T02A in the PEP and vessels UFP-VSL-00002A and B in the WTP PTF). The second scenario has caustic leaching conducted in the UFP-1 ultrafiltration feed preparation vessels (i.e., vessels UFP-VSL-T01A and B in the PEP; vessels UFP-VSL-00001A and B in the WTP PTF). In both scenarios, 19-M sodium hydroxide solution (NaOH, caustic) is added to the waste slurry in the vessels to leach solid aluminum compounds (e.g., gibbsite, boehmite). Caustic addition is followed by a heating step that uses direct injection of steam to accelerate the leaching process. Following the caustic leach, the vessel contents are cooled using vessel cooling jackets and/or external heat exchangers. The main difference between the two scenarios is that for leaching in UFP-1, the 19-M NaOH is added to un-concentrated waste slurry (3 to 8 wt% solids), while for leaching in UFP-2, the slurry is concentrated to nominally 20 wt% solids using cross-flow ultrafiltration before adding caustic. The work described in this report addresses the kinetics of caustic leach under WTP conditions, based on tests performed with a Hanford waste simulant. The tests were completed at the lab-scale and in the PEP, which is a 1/4.5-scale mock-up of key PTF process equipment. The purpose of this report is to summarize the results from both scales that are related to caustic leach chemistry to support a scale-up factor for the submodels to be used in the G2 model, which predicts WTP operating performance. The scale-up factor will take the form of an adjustment factor for the rate constant in the boehmite leach kinetic equation in the G2 model.

Mahoney, Lenna A.; Rassat, Scot D.; Eslinger, Paul W.; Aaberg, Rosanne L.; Aker, Pamela M.; Golovich, Elizabeth C.; Hanson, Brady D.; Hausmann, Tom S.; Huckaby, James L.; Kurath, Dean E.; Minette, Michael J.; Sundaram, S. K.; Yokuda, Satoru T.

2009-08-14T23:59:59.000Z

493

Crystal of GTP Cyclohydrolase Type IB  

DOE Patents [OSTI]

This invention relates to a novel, bacterial GTP Cyclohydrolase Type IB enzyme, and the crystal structure thereof.

Swairjo, Manal A.; Iwata-Reuyl, Dirk; de Crecy-Lagard, Valerie

2012-12-11T23:59:59.000Z

494

Dependent types for JavaScript  

Science Journals Connector (OSTI)

We present Dependent JavaScript (DJS), a statically typed dialect of the imperative, object-oriented, dynamic language. DJS supports the particularly challenging features such as run-time type-tests, higher-order functions, extensible objects, prototype ... Keywords: JavaScript, arrays, prototype inheritance, refinement types, strong updates

Ravi Chugh; David Herman; Ranjit Jhala

2012-11-01T23:59:59.000Z

495

Type IV Pilin Proteins: Versatile Molecular Modules  

Science Journals Connector (OSTI)

...2012 review-article Reviews Type IV Pilin Proteins...adaptable functional plan. The type IV pilin is...substrates. In this review, we consider recent...adaptable functional plan. The type IV pilin is...substrates. In this review, we consider recent...

Carmen L. Giltner; Ylan Nguyen; Lori L. Burrows

2012-12-01T23:59:59.000Z

496

Aspectual Session Types Nicolas Tabareau Mario Sdholt  

E-Print Network [OSTI]

Aspectual Session Types Nicolas Tabareau Mario Südholt ASCOLA Team Mines Nantes & Inria & LINA locally in each peer. Well-typed processes behave accordingly to the global protocol specification to support modular extensions with aspectual session types, a static pointcut/advice mechanism at the session

Paris-Sud XI, Université de

497

An Alexandrov-Fenchel-type inequality in hyperbolic space with an application to a Penrose inequality  

E-Print Network [OSTI]

We use the inverse mean curvature flow to prove a sharp Alexandrov-Fenchel-type inequality for star-shaped, strictly mean convex hypersurfaces in hyperbolic $n$-space, $n\\geq 3$. As an application we establish, in any dimension, an optimal Penrose inequality for asymptotically hyperbolic graphs carrying a minimal horizon, with the equality occurring if and only if the graph is an anti-de Sitter-Schwarzschild solution. This sharpens previous results by Dahl-Gicquaud-Sakovich and settles, for this class of initial data sets, the conjectured Penrose inequality for time-symmetric space-times with negative cosmological constant.

Levi Lopes de Lima; Frederico Giro

2014-06-06T23:59:59.000Z

498

Elastic constants and Fermi surface topology change in Calaverite AuTe{sub 2}: A density functional study  

SciTech Connect (OSTI)

Structural, elastic, electronic and Fermi surface studies of AuTe{sub 2} have been carried out by means of first principles calculations based on density functional theory. The calculated ground state properties agree well with the experiment. Fermi surface and elastic constants are predicted for the first time and from the calculated elastic constants we find the compound to be mechanically stable satisfying the stability criteria of monoclinic structure. In addition, we also find the c-axis to be more compressible than the other two which is also speculated from the present work. The metallic behaviour of this compound is confirmed from the electronic band structure calculation as we find the bands to cross the Fermi level (E{sub F}). In addition, we also observe a FS topology change under pressure which is also explained in the present work.

Gudelli, Vijay Kumar, E-mail: kanchana@iith.ac.in; Kanchana, V., E-mail: kanchana@iith.ac.in [Department of Physics, Indian Institute of Technology Hyderabad, Ordnance Factory Estate, Yeddumailaram-502205, Andhra Pradesh (India)

2014-04-24T23:59:59.000Z

499

Photon-number squeezing by the nonlinear backward pump process in a constant-voltage heterojunction LED  

Science Journals Connector (OSTI)

We investigated extensively the sub-Poissonian-photon-state generation by the microscopic backward-pump (BP) process in a semiconductor heterojunction light-emitting diode (LED) under constant-voltage operation. In particular, the BP rate relative to the forward pump rate has been carefully evaluated from the dc characteristics of the LED and shown to depend strongly on the injection current and the device temperature. We then compare the experimental results of the photon-number squeezing performed at various temperatures in the constant-voltage-drive setup with the theoretical prediction estimated numerically using the parameter values determined from the dc measurements. As a consequence, it was proven that the observed squeezing at room temperature is successfully interpreted only in terms of the nonlinear BP model, while that at low temperature (?100?K) is explained simply by the conventional model based on macroscopic Coulomb-blockade effect for the pump-noise suppression.

Hiroyuki Sumitomo; Masamichi Yamanishi; Yutaka Kadoya

2002-04-10T23:59:59.000Z

500

Concircular tensors in Spaces of Constant Curvature: With Applications to Orthogonal Separation of The Hamilton-Jacobi Equation  

E-Print Network [OSTI]

We study concircular tensors in spaces of constant curvature and then apply the results obtained to the problem of the orthogonal separation of the Hamilton-Jacobi equation on these spaces. Any coordinates which separate the geodesic Hamilton-Jacobi equation are called separable. Specifically for spaces of constant curvature, we obtain canonical forms of concircular tensors modulo the action of the isometry group, we obtain the separable coordinates induced by irreducible concircular tensors, and we obtain warped products adapted to reducible concircular tensors. Using these results, we show how to enumerate the isometrically inequivalent orthogonal separable coordinates, construct the transformation from separable to Cartesian coordinates, and execute the Benenti-Eisenhart-Kalnins-Miller (BEKM) separation algorithm for separating natural Hamilton-Jacobi equations.

Krishan Rajaratnam; Raymond G. McLenaghan

2014-04-10T23:59:59.000Z