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1

The type Ia supernovae and the Hubble's constant  

E-Print Network [OSTI]

The Hubble's constant is usually surmised to be a constant; but the experiments show a large spread and conflicting estimates. According to the plasma-redshift theory, the Hubble's constant varies with the plasma densities along the line of sight. It varies then slightly with the direction and the distance to a supernova and a galaxy. The relation between the magnitudes of type Ia supernovae and their observed redshifts results in an Hubble's constant with an average value in intergalactic space of 59.44 km per s per Mpc. The standard deviation from this average value is only 0.6 km per s per Mpc, but the standard deviation in a single measurement is about 8.2 km per s per Mpc. These deviations do not include possible absolute calibration errors. The experiments show that the Hubble's constant varies with the intrinsic redshifts of the Milky Way galaxy and the host galaxies for type Ia supernovae, and that it varies with the galactic latitude. These findings support the plasma-redshift theory and contradict the contemporary big-bang theory. Together with the previously reported absence of time dilation in type Ia supernovae measurements, these findings have profound consequences for the standard cosmological theory.

Ari Brynjolfsson

2004-07-20T23:59:59.000Z

2

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

E-Print Network [OSTI]

consisted of 453 (86.1%) White, 46 (8.7%) Black, 25 (4.8%) Hispanic, and 2 (0.4%) Asian. Mean length of stay, total medical expenses, and number of diagnoses were not significantly different by %OBW. However, there was a significant difference (P < 0...

Morat, Michelle Elizabeth

1997-01-01T23:59:59.000Z

3

Analysis of error in using fractured gas well type curves for constant pressure production  

E-Print Network [OSTI]

of normalized time and normalized cumulative production is a large improvement over using a constant evaluation pressure. 0 imens ion less cumulative production type curves are particularly useful in modeling production for economic projections, such as re... of MASTER OF SCIENCE May 1987 Major Subject: Petroleum Engineering ANALYSIS OF ERROR IN USING FRACTURED GAS WELL TYPE CURVES FOR CONSTANT PRESSURE PRDDUCTION A Thesis by DAVID WAYNE SCHKADE Approved as to style and content by: S. A. Ho lditch...

Schkade, David Wayne

1987-01-01T23:59:59.000Z

4

Bianchi Type III Anisotropic Dark Energy Models with Constant Deceleration Parameter  

E-Print Network [OSTI]

The Bianchi type III dark energy models with constant deceleration parameter are investigated. The equation of state parameter $\\omega$ is found to be time dependent and its existing range for this model is consistent with the recent observations of SN Ia data, SN Ia data (with CMBR anisotropy) and galaxy clustering statistics. The physical aspect of the dark energy models are discussed.

Anil Kumar Yadav; Lallan Yadav

2010-10-02T23:59:59.000Z

5

Feasibility of Measuring the Cosmological Constant [LAMBDA] and Mass Density [Omega] using Type Ia Supernovae  

E-Print Network [OSTI]

at z = 1. uncertainty for supernovae at z = 1. mR Adding theMass Density .Q Using Type Ia Supernovae A. Goobar and S.Density Q Using Type Ia Supernovae Ariel Goobar l and Saul

Goobar, A.

2008-01-01T23:59:59.000Z

6

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

7

Gravitational waves in vacuum spacetimes with cosmological constant. I. Classification and geometrical properties of non-twisting type N solutions  

E-Print Network [OSTI]

All non-twisting Petrov-type N solutions of vacuum Einstein field equations with cosmological constant Lambda are summarized. They are shown to belong either to the non-expanding Kundt class or to the expanding Robinson-Trautman class. Invariant subclasses of each class are defined and the corresponding metrics are given explicitly in suitable canonical coordinates. Relations between the subclasses and their geometrical properties are analyzed. In the subsequent paper these solutions are interpreted as exact gravitational waves propagating in de Sitter or anti-de Sitter spacetimes.

J. Bicak; J. Podolsky

1999-07-13T23:59:59.000Z

8

Staying Informed | Department of Energy  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-Up from the GridwiseSiteDepartment ofCreatingCell Research |ofStay Above WaterStaying

9

Design optimization of cable-stayed bridges  

E-Print Network [OSTI]

The goal of this thesis is to achieve a basic understanding of cable-stayed systems. Issues to be treated are the diachronic evolution of cable-stayed bridges, including the advantages, the limitations and the basic design ...

Bessas, Georgios

2006-01-01T23:59:59.000Z

10

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

11

ISQ derivation ("derivation in SI units") of a Landau and Lifschitz type formula for field ionization rate-constant  

E-Print Network [OSTI]

In the 1940s/50s, Landau and Lifschitz (LL) published in their Quantum Mechanics textbook what is now a well known formula for the rate-constant for the electrostatic field ionization (ESFI) of a hydrogen atom in its ground electronic state. This formula is widely regarded as correct in the low field limit, and has played a significant role in development of ESFI theory. The formula was originally derived and presented in the atomic units system, with the hydrogen ionization energy I_H set equal to (1/2), making it impossible to determine by inspection to what power I_H is raised in its pre-exponential. Knowledge of this power would be useful in the context of near-surface ESFI, where significant image-force-induced shifts in effective ionization energy can occur. Also, large numbers of applied scientists and engineers work with ESFI as a process of technological importance, but cannot nowadays be expected to have familiarity with the Gaussian or atomic units equation systems. In the 1970s, what is now called the International System of Quantities (ISQ), which includes the equation system behind SI units, was internationally adopted as the primary system for university teaching and for communication of scientific equations between theoreticians and applied scientists and engineers. However, 40 years on, no transparent derivation of an ISQ equivalent of the LL formula is easily found in the literature. This tutorial paper presents a detailed ISQ derivation, finds that ionization energy appears in the pre-exponential as I_H to the power (7/2) (not 5/2, as sometimes stated) and defines a universal "tunnelling ionization constant" that appears in the ISQ formula pre-exponential. It is shown how this formula relates to the "attempt frequency" form often used to describe rate-constants for tunnelling processes, and an ISQ expression is given for the motive energy in the related JWKB integral.

Richard G. Forbes

2015-02-25T23:59:59.000Z

12

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

E-Print Network [OSTI]

. These cable stays contain an annular layer of portland cement grout which surrounds the steel cable strands, and provides corrosion protection to the cables. During the grouting operation there is a possibility that voids may form in the grout layer and act...-type of cable-stayed bridge are as shown in Figure 4n". Problem Statement The typical arrangement of a cable stay consists of a steel multistrand cable encased in a polyethylene (PE) pipe, and grouted with portland cement or epoxy grout. Each strand in turn...

Nakirekanti, Sreenivas

1992-01-01T23:59:59.000Z

13

Gravitational waves in vacuum spacetimes with cosmological constant. II. Deviation of geodesics and interpretation of non-twisting type N solutions  

E-Print Network [OSTI]

In a suitably chosen essentially unique frame tied to a given observer in a general spacetime, the equation of geodesic deviation can be decomposed into a sum of terms describing specific effects: isotropic (background) motions associated with the cosmological constant, transverse motions corresponding to the effects of gravitational waves, longitudinal motions, and Coulomb-type effects. Conditions under which the frame is parallelly transported along a geodesic are discussed. Suitable coordinates are introduced and an explicit coordinate form of the frame is determined for spacetimes admitting a non-twisting null congruence. Specific properties of all non-twisting type N vacuum solutions with cosmological constant Lambda (non-expanding Kundt class and expanding Robinson-Trautman class) are then analyzed. It is demonstrated that these spacetimes can be understood as exact transverse gravitational waves of two polarization modes "+" and "x", shifted by pi/4, which propagate "on" Minkowski, de Sitter, or anti-de Sitter backgrounds. It is also shown that the solutions with Lambda>0 may serve as exact demonstrations of the cosmic "no-hair" conjecture in radiative spacetimes with no symmetry.

J. Bicak; J. Podolsky

1999-07-13T23:59:59.000Z

14

Recovery Act Helps Fuel Cell Company Stay on Course | Department...  

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

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...

15

Win-stay lose-shift strategy in formation changes in football  

E-Print Network [OSTI]

Managerial decision making is likely to be a dominant determinant of performance of teams in team sports. Here we use Japanese and German football data to investigate correlates between temporal patterns of formation changes across matches and match results. We found that individual teams and managers both showed win-stay lose-shift behavior, a type of reinforcement learning. In other words, they tended to stick to the current formation after a win and switch to a different formation after a loss. In addition, formation changes did not affect the results of succeeding matches in most cases. The results indicate that a swift implementation of a new formation in the win-stay lose-shift manner may not be a successful managerial rule of thumb.

Tamura, Kohei

2015-01-01T23:59:59.000Z

16

Varying constants quantum cosmology  

E-Print Network [OSTI]

We discuss minisuperspace models within the framework of varying physical constants theories including $\\Lambda$-term. In particular, we consider the varying speed of light (VSL) theory and varying gravitational constant theory (VG) using the specific ans\\"atze for the variability of constants: $c(a) = c_0 a^n$ and $G(a)=G_0 a^q$. We find that most of the varying $c$ and $G$ minisuperspace potentials are of the tunneling type which allows to use WKB approximation of quantum mechanics. Using this method we show that the probability of tunneling of the universe "from nothing" ($a=0)$ to a Friedmann geometry with the scale factor $a_t$ is large for growing $c$ models and is strongly suppressed for diminishing $c$ models. As for $G$ varying, the probability of tunneling is large for $G$ diminishing, while it is small for $G$ increasing. In general, both varying $c$ and $G$ change the probability of tunneling in comparison to the standard matter content (cosmological term, dust, radiation) universe models.

Katarzyna Leszczynska; Adam Balcerzak; Mariusz P. Dabrowski

2015-01-26T23:59:59.000Z

17

Big biology is here to stay  

SciTech Connect (OSTI)

The new, large-scale research centers started by the Roadmap initiative created new research opportunities. The purpose of many of them, in fact, is to provide resources to the scientific community that can be exploited to enable new research ideas and directions. Research grants are also available for investigators to contribute to many of these centers. The NIH is now actively soliciting ideas for new Roadmap projects, so if you have an opinion on the most useful types of projects to fund, let them know. However, just complaining about big science is not useful. The success of large, high profile NIH projects is the best way to get increased funding for all of NIH and to accelerate scientific advances in biology in the process.

Wiley, H. S.

2008-08-01T23:59:59.000Z

18

1. Physical constants 101 1. PHYSICAL CONSTANTS  

E-Print Network [OSTI]

with the Fermi coupling constant) comes from the Particle Data Group. The figures in parentheses after the values of 1 eV/c particle hc/(1 eV) 1.239 841 875(31)Ă?10-6 m 25 Rydberg energy hcR = mee4/2(4 0)2 2 = mec22 accel. gN 9.806 65 m s-2 exact Avogadro constant NA 6.022 141 79(30)Ă?1023 mol-1 50 Boltzmann constant k

19

1. Physical constants 1 1. PHYSICAL CONSTANTS  

E-Print Network [OSTI]

of constants (beginning with the Fermi coupling constant) comes from the Particle Data Group. The figures of 1 eV/c particle hc/(1 eV) 1.239 841 930(27)Ă?10-6 m 22 Rydberg energy hcR = mee4/2(40)2 2 = mec22 gravitational accel. gN 9.806 65 m s-2 exact Avogadro constant NA 6.022 141 29(27)Ă?1023 mol-1 44 Boltzmann

20

An Environmental Variation of Constants  

E-Print Network [OSTI]

Models of modified gravity, whereby local tests of gravity are evaded thanks to a screening mechanism of the chameleon or Damour-Polyakov types, lead to a spatial variation of the particle masses and the fine structure constant. This is triggered by the environmental dependence of the value of the scalar field whose presence modifies gravity. In dense media, the field settles at a density dependent value while in sparse environments it takes the background cosmological value. We estimate that the maximal deviation of constants from their present values is constrained by local tests of gravity, and must be less than $10^{-6}$.

Philippe Brax

2014-06-24T23:59:59.000Z

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.


21

Stay Active this Summer (and Save Energy, Money, and the Environment...  

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

Stay 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...

22

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 ...

23

Stay Rates of Foreign Doctorate Recipients from U.S. Universities, 2007  

SciTech Connect (OSTI)

Study of the stay rate in the United States of foreign nationals receiving their S/E doctorates from U.S. universities. This study has estimated stay rates in 2007 for persons receiving a doctorate one, two, five, and ten years previously. The two-year stay rate (for 2005 graduates) recovered from the decline experienced earlier in the decade. The five-year stay rate (for 2002 graduates) is lower; the ten-year stay rate (for 1997 graduates) reached a new high.

Dr. Michael G. Finn

2010-01-04T23:59:59.000Z

24

FORGING THE FUTURE STAY CONNECTED: In This Issue Electricity  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: Vegetation ProposedUsing ZirconiaPolicy andExsolutionFES Committees of9,of Energy8 CH2MNews from STAY

25

Stay Warm in Your Apartment | Department of Energy  

Office of Environmental Management (EM)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "of EnergyEnergyENERGYWomen Owned Small Business Webinar JuneFOADepartment ofCool for Less Money with aUpStay

26

Billboard: Stay on the job | Y-12 National Security Complex  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth (AOD)ProductssondeadjustsondeadjustAboutScienceCareers Apply for aCould Work asAdministration1Stay on the

27

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

28

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

29

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

30

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

31

Stay Rates of Foreign Doctorate Recipients from U.S. Universities, 2005  

SciTech Connect (OSTI)

This is the latest in a series of studies conducted for the National Science Foundation to estimate the proportion of foreign science / engineering doctorate recipients from U.S. universities who stayed in the United States after graduation. Sixty-six percent of those who graduated in 2003 were still in the United States in 2005, a 5 percent decline since the last report. But the five-year stay rate continues to climb, now at 68 percent.

Mike Finn

2008-02-01T23:59:59.000Z

32

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

33

A CENSUS OF LONG STAY PATIENTS IN GOVERNMENT MENTAL HOSPITALS IN INDIA  

E-Print Network [OSTI]

A single day census found that long-stay patients (LSP) numbering 7,307 accounted for about 48 % of the total inpatient strength of 15,345 in government mental hospitals in India. A load of 2695 (37%) LSP were in two to five years duration of stay, 2782 (38%) were in five to fifteen years duration of stay, and the remaining 1830 (25%) were staying for more than fifteen years. About 11 % of LSP were aged sixty years and above, majority (53%) were males, non-voluntary cases constituted 80%. and more than two-thirds (69%) were schizophrenics. The characteristics distributions associated with high rates of LSP at individual hospitals were identified. The load of LSP was decreased by 9 % during the period from 1993 to 1999. Key words: Census, long-stay patients, government mental hospitals, national indicators Sufficient data on long-stay patients (LSP) in government mental hospitals were lacking in India, though certain informations about some individual hospitals or a small group of hospitals have been reported (Sathyavathi and

M. Venkataswamy Reddy

34

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

35

On the relationship of gravitational constants in KK reduction  

E-Print Network [OSTI]

In this short note, we try to clarify a seemly trivial but often confusing question in relating a higher-dimensional physical gravitational constant to its lower-dimensional correspondence in Kaluza-Klein reduction. In particular, we re-derive the low-energy M-theory gravitational constant in terms of type IIA string coupling $g_s$ and constant $\\alpha'$ through the metric relation between the two theories.

Lu, J X

2000-01-01T23:59:59.000Z

36

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

2008-05-03T23:59:59.000Z

37

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

38

Impact of changes in length of stay on the demand for residential care  

E-Print Network [OSTI]

Impact of changes in length of stay on the demand for residential care services in England on the demand for residential care services in England, Report commissioned by Bupa Care Services, PSSRU Discussion Paper 2771, Canterbury: PSSRU Introduction Residential care services constitute the largest

39

Structure constants of diagonal reduction algebras of gl type  

E-Print Network [OSTI]

We describe, in terms of generators and relations, the reduction algebra, related to the diagonal embedding of the Lie algebra $\\gl_n$ into $\\gl_n\\oplus\\gl_n$. Its representation theory is related to the theory of decompositions of tensor products of $\\gl_n$-modules.

S. Khoroshkin; O. Ogievetsky

2011-07-12T23:59:59.000Z

40

ORISE: Stay Rates of Foreign Doctorate Recipients from U.S. Universities  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May JunDatastreamsmmcrcalgovInstrumentsrucLas Conchas recoveryLaboratory |CHEMPACKRadiological programStandards development For 30Stay

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

Mesonic low-energy constants  

E-Print Network [OSTI]

We review the status of the coupling constants of chiral Lagrangians in the meson sector, the so-called low-energy constants (LECs). Special emphasis is put on the chiral $SU(2)$ and $SU(3)$ Lagrangians for the strong interactions of light mesons. The theoretical and experimental input for determining the corresponding LECs is discussed. In the two-flavour sector, we review the knowledge of the $O(p^4)$ LECs from both continuum fits and lattice QCD analyses. For chiral $SU(3)$, NNLO effects play a much bigger role. Our main new results are fits of the LECs $L_i$ both at NLO and NNLO, making extensive use of the available knowledge of NNLO LECs. We compare our results with available lattice determinations. Resonance saturation of LECs and the convergence of chiral $SU(3)$ to NNLO are discussed. We also review the status of predictions for the LECs of chiral Lagrangians with dynamical photons and leptons.

Johan Bijnens; Gerhard Ecker

2014-07-25T23:59:59.000Z

42

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

43

Study of the relationship between indoor daylight environments and patient average length of stay (ALOS) in healthcare facilities  

E-Print Network [OSTI]

This study investigates how indoor daylight environments affect patient Average Length of Stay (ALOS), by evaluating and analyzing daylight levels in patient rooms in comparison to their ALOS. The patient ALOS data were taken at one general hospital...

Choi, Joon Ho

2007-04-25T23:59:59.000Z

44

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

45

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

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-Up from the GridwiseSiteDepartment ofCreatingCell Research |ofStay Above Water

46

Typed Self-Optimization  

E-Print Network [OSTI]

type T y[O]. The operator IsIs is self-applicative, in thatargument t is any of Is[O] or IsIs, and otherwise behavesproof constant introduced by IsIs proves that the type of t

Brown, Matt

2013-01-01T23:59:59.000Z

47

Rate constants for charge transfer across semiconductor-liquid interfaces  

SciTech Connect (OSTI)

Interfacial charge-transfer rate constants have been measured for n-type Si electrodes in contact with a series of viologen-based redox couples in methanol through analyses of the behavior of these junctions with respect to their current density versus potential and differential capacitance versus potential properties. The data allow evaluation of the maximum rate constant (and therefore the electronic coupling) for majority carriers in the solid as well as of the dependence of the rate constant on the driving force for transfer of delocalized electrons from the n-Si semiconducting electrode into the localized molecular redox species in the solution phase. The data are in good agreement with existing models of this interfacial electron transfer process and provide insight into the fundamental kinetic events underlying the use of semiconducting photoelectrodes in applications such as solar energy conversion. 23 refs., 3 figs.

Fajardo, A.M.; Lewis, N.S. [California Institute of Technology, Pasadena, CA (United States)

1996-11-08T23:59:59.000Z

48

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

49

Kepler Problem in the Constant Curvature Space  

E-Print Network [OSTI]

We present algebraic derivation of the result of Schr\\"{o}dinger [1] for the spectrum of hydrogen atom in the space with constant curvature.

G. Pronko

2007-06-04T23:59:59.000Z

50

The Constant Voltage Transformer (CVT) for Mitigating Effects of Voltage Sags on Industrial Equipment  

E-Print Network [OSTI]

) an increase in loads that use power electronics in some type of power conversion configuration [1][2]. This paper presents applications of the constant-voltage transformer (CVT) for mitigating the effects of electric service voltage sags on industrial...

Ferraro, R. J.; Osborne, R.; Stephens, R.

51

Inverse problem in anisotropic poroelasticity: Drained constants from undrained ultrasound measurements  

SciTech Connect (OSTI)

Poroelastic analysis has traditionally focused on the relationship between dry or drained constants which are assumed known and the saturated or undrained constants which are assumed unknown. However, there are many applications in this field of study for which the main measurements can only be made on the saturated/undrained system, and then it is uncertain what the eects of the uids were on the system, since the drained constants remain a mystery. The work presented here shows how to deduce drained constants from undrained constants for anisotropic systems having symmetries ranging from isotropic to orthotropic. Laboratory ultrasound data are then inverted for the drained constants in three granular packings: one of glass beads, and two others for distinct types of more or less angular sand grain packings. Experiments were performed under uniaxial stress, which resulted in hexagonal (transversely isotropic) symmetry of the poroelastic response. One important conclusion from the general analysis is that the drained constants are uniquely related to the undrained constants, assuming that porosity, grain bulk modulus, and pore uid bulk modulus are already known. Since the resulting system of equations for all the drained constants is linear, measurement error in undrained constants also propagates linearly into the computed drained constants.

Berryman, J.G.; Nakagawa, S.

2009-11-20T23:59:59.000Z

52

Hotel Info in Los Alamos There are many wonderful places to stay in Santa Fe as well as the surrounding  

E-Print Network [OSTI]

Alamos, NM 87544 505-672-3838 Holiday Inn Express at Entrada Park 60 Entrada Dr. Los Alamos, NM 87544 505Hotel Info in Los Alamos There are many wonderful places to stay in Santa Fe as well as the surrounding areas but the following is a list of hotels in Los Alamos: Adobe Pines Bed & Breakfast 2101 Loma

53

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

54

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

55

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

56

Constants and Pseudo-Constants of Coupled Beam Motion in the PEP-II Rings  

SciTech Connect (OSTI)

Constants of beam motion help as cross checks to analyze beam diagnostics and the modeling procedure. Pseudo-constants, like the betatron mismatch parameter or the coupling parameter det C, are constant till certain elements in the beam line change them. This can be used to visually find the non-desired changes, pinpointing errors compared with the model.

Decker, F.J.; Colocho, W.S.; Wang, M.H.; Yan, Y.T.; Yocky, G.; /SLAC

2011-11-01T23:59:59.000Z

57

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

58

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

59

Optical Constants ofOptical Constants of Uranium Nitride Thin FilmsUranium Nitride Thin Films  

E-Print Network [OSTI]

Optical Constants ofOptical Constants of Uranium Nitride Thin FilmsUranium Nitride Thin FilmsDelta--Beta Scatter Plot at 220 eVBeta Scatter Plot at 220 eV #12;Why Uranium Nitride?Why Uranium Nitride? UraniumUranium, uranium,Bombard target, uranium, with argon ionswith argon ions Uranium atoms leaveUranium atoms leave

Hart, Gus

60

Thermodynamics and dynamics of a monoatomic glass former. Constant pressure and constant volume behavior  

E-Print Network [OSTI]

Thermodynamics and dynamics of a monoatomic glass former. Constant pressure and constant volume-pressure simulations of the thermodynamic and dynamic properties of the low-temperature liquid and crystalline phases the thermodynamics of the configurational manifold as an ensemble of excitations, each carrying an excitation entropy

Matyushov, Dmitry

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

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

62

Adaptation in constant utility nonstationary environments  

E-Print Network [OSTI]

Adaptation in constant utility non­stationary environments Michael L. Littman & David H. Ackley Abstract Environments that vary over time present a fundamental problem to adaptive systems. Although adaptive opportunities. We consider a broad class of non­stationary environments, those which combine

Littman, Michael L.

63

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

64

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

65

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

66

Constant-Pressure Measurement of Steam-  

E-Print Network [OSTI]

SGP-TR-169 Constant-Pressure Measurement of Steam- Water Relative Permeability Peter A. O by measuring in-situ steam saturation more directly. Mobile steam mass fraction was established by separate steam and water inlets or by correlating with previous results. The measured steam-water relative

Stanford University

67

Polynomial Constants are Decidable Markus Muller-Olm1  

E-Print Network [OSTI]

Polynomial Constants are Decidable Markus M¨uller-Olm1 and Helmut Seidl2 1 University of Dortmund variable, are interpreted. Another decidable class of constants are finite constants [19]. This motivated M¨uller-Olm

MĂĽller-Olm, Markus

68

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...

69

acid dissociation constants: Topics by E-print Network  

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

of Constants . . . . . . . . . . . . . . . . . . . . . . 20 3.1.1 Flow Graphs Mller-Olm, Markus 333 Cosmological constant, supersymmetry, nonassociativity, and Big Numbers...

70

approx constant applicable: Topics by E-print Network  

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

of Constants . . . . . . . . . . . . . . . . . . . . . . 20 3.1.1 Flow Graphs Mller-Olm, Markus 280 Cosmological constant, supersymmetry, nonassociativity, and Big Numbers...

71

acid dissociation constant: Topics by E-print Network  

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

of Constants . . . . . . . . . . . . . . . . . . . . . . 20 3.1.1 Flow Graphs Mller-Olm, Markus 333 Cosmological constant, supersymmetry, nonassociativity, and Big Numbers...

72

afectan las constantes: Topics by E-print Network  

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

of Constants . . . . . . . . . . . . . . . . . . . . . . 20 3.1.1 Flow Graphs Mller-Olm, Markus 144 Cosmological constant, supersymmetry, nonassociativity, and Big Numbers...

73

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...

74

Variable energy constant current accelerator structure  

DOE Patents [OSTI]

A variable energy, constant current ion beam accelerator structure is disclosed comprising an ion source capable of providing the desired ions, a pre-accelerator for establishing an initial energy level, a matching/pumping module having means for focusing means for maintaining the beam current, and at least one main accelerator module for continuing beam focus, with means capable of variably imparting acceleration to the beam so that a constant beam output current is maintained independent of the variable output energy. In a preferred embodiment, quadrupole electrodes are provided in both the matching/pumping module and the one or more accelerator modules, and are formed using four opposing cylinder electrodes which extend parallel to the beam axis and are spaced around the beam at 90/degree/ intervals with opposing electrodes maintained at the same potential. 12 figs., 3 tabs.

Anderson, O.A.

1988-07-13T23:59:59.000Z

75

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

76

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

77

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

78

Regular Type III and Type N Approximate Solutions  

E-Print Network [OSTI]

New type III and type N approximate solutions which are regular in the linear approximation are shown to exist. For that, we use complex transformations on self-dual Robinson-Trautman metrics rather then the classical approach. The regularity criterion is the boundedness and vanishing at infinity of a scalar obtained by saturating the Bel-Robinson tensor of the first approximation by a time-like vector which is constant with respect to the zeroth approximation.

Philip Downes; Paul MacAllevey; Bogdan Nita; Ivor Robinson

2001-05-18T23:59:59.000Z

79

TASI Lectures on the cosmological constant  

SciTech Connect (OSTI)

The energy density of the vacuum, Lambda, is at least 60 orders of magnitude smaller than several known contributions to it. Approaches to this problem are tightly constrained by data ranging from elementary observations to precision experiments. Absent overwhelming evidence to the contrary, dark energy can only be interpreted as vacuum energy, so the venerable assumption that Lambda=0 conflicts with observation. The possibility remains that Lambda is fundamentally variable, though constant over large spacetime regions. This can explain the observed value, but only in a theory satisfying a number of restrictive kinematic and dynamical conditions. String theory offers a concrete realization through its landscape of metastable vacua.

Bousso, Raphael; Bousso, Raphael

2007-08-30T23:59:59.000Z

80

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

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

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

82

Constant Volume During Combustion | Department of Energy  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious Rank EERE:YearRound-Up fromDepartmentTieCelebrate Earth Codestheatfor Optimized91 *09ofNameConstant Volume

83

$f(T)$ Theories and Varying Fine Structure Constant  

E-Print Network [OSTI]

In analogy to $f(R)$ theory, recently $f(T)$ theory has been proposed to drive the current accelerated expansion without invoking dark energy. In the literature, the observational constraints on $f(T)$ theories were obtained mainly by using the cosmological data, such as type Ia supernovae (SNIa), baryon acoustic oscillation (BAO), and cosmic microwave background radiation (CMB). In this work, we instead try to constrain $f(T)$ theories with the varying fine structure "constant", $\\alpha\\equiv e^2/\\hbar c$. We find that the constraints on $f(T)$ theories from the observational $\\Delta\\alpha/\\alpha$ data are very severe. In fact, they make $f(T)$ theories almost indistinguishable from $\\Lambda$CDM model.

Wei, Hao; Qi, Hao-Yu

2011-01-01T23:59:59.000Z

84

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

85

From constant to non-degenerately vanishing magnetic fields in superconductivity  

E-Print Network [OSTI]

We explore the relationship between two reference functions arising in the analysis of the Ginzburg-Landau functional. The first function describes the distribution of superconductivity in a type II superconductor subjected to a constant magnetic field. The second function describes the distribution of superconductivity in a type II superconductor submitted to a variable magnetic field that vanishes non-degenerately along a smooth curve.

Bernard Helffer; Ayman Kachmar

2015-03-30T23:59:59.000Z

86

American Institute of Aeronautics and Astronautics Comparison of Tensile Fatigue Resistance and Constant  

E-Print Network [OSTI]

and Constant Life Diagrams for Several Potential Wind Turbine Blade Laminates Daniel D. Samborsky, Timothy J laminates of current and potential interest for wind turbine blades, representing three types of fibers: E loading relative to an earlier material. Comparisons of the materials show significant improvements under

87

The Problem of the Cosmological Constant  

E-Print Network [OSTI]

ElectroMagnetic Quantum Gravity (EMQG) is applied to the problem of the Cosmological Constant. EMQG is a quantum gravity theory (ref. 1) in which the virtual particles of the quantum vacuum play a very important role in all gravitational interactions, and also in accelerated motion. According to EMQG theory (and quantum field theory in general), empty space is populated by vast numbers of virtual particles, consisting of virtual fermion and virtual anti-fermion particles, which posses mass, and also virtual boson particles of all the various force particle species. Therefore the problem of the cosmological constant is essentially equivalent to a determination of the mass contributed by all the virtual particles of the vacuum to the overall curvature and dynamics of the entire universe. Our original analysis was based on the assumption of perfect symmetry in the creation and destruction of virtual fermion and virtual anti-fermion particle pairs in the quantum vacuum, which is in accordance with the existing la...

Ostoma, T; Ostoma, Tom; Trushyk, Mike

1999-01-01T23:59:59.000Z

88

Is Cosmological Constant Needed in Higgs Inflation?  

E-Print Network [OSTI]

The detection of B-mode shows a very powerful constraint to theoretical inflation models through the measurement of the tensor-to-scalar ratio $r$. Higgs boson is the most likely candidate of the inflaton field. But usually, Higgs inflation models predict a small value of $r$, which is not quite consistent with the recent results from BICEP2. In this paper, we explored whether a cosmological constant energy component is needed to improve the situation. And we found the answer is yes. For the so-called Higgs chaotic inflation model with a quadratic potential, it predicts $r\\approx 0.2$, $n_s\\approx0.96$ with e-folds number $N\\approx 56$, which is large enough to overcome the problems such as the horizon problem in the Big Bang cosmology. The required energy scale of the cosmological constant is roughly $\\Lambda \\sim (10^{14} \\text{GeV})^2 $, which means a mechanism is still needed to solve the fine-tuning problem in the later time evolution of the universe, e.g. by introducing some dark energy component.

Feng, Chao-Jun

2014-01-01T23:59:59.000Z

89

Is Cosmological Constant Needed in Higgs Inflation?  

E-Print Network [OSTI]

The detection of B-mode shows a very powerful constraint to theoretical inflation models through the measurement of the tensor-to-scalar ratio $r$. Higgs boson is the most likely candidate of the inflaton field. But usually, Higgs inflation models predict a small value of $r$, which is not quite consistent with the recent results from BICEP2. In this paper, we explored whether a cosmological constant energy component is needed to improve the situation. And we found the answer is yes. For the so-called Higgs chaotic inflation model with a quadratic potential, it predicts $r\\approx 0.2$, $n_s\\approx0.96$ with e-folds number $N\\approx 56$, which is large enough to overcome the problems such as the horizon problem in the Big Bang cosmology. The required energy scale of the cosmological constant is roughly $\\Lambda \\sim (10^{14} \\text{GeV})^2 $, which means a mechanism is still needed to solve the fine-tuning problem in the later time evolution of the universe, e.g. by introducing some dark energy component.

Chao-Jun Feng; Xin-Zhou Li

2014-04-15T23:59:59.000Z

90

Superintegrable systems on spaces of constant curvature  

SciTech Connect (OSTI)

Construction and classification of two-dimensional (2D) superintegrable systems (i.e. systems admitting, in addition to two global integrals of motion guaranteeing the Liouville integrability, the third global and independent one) defined on 2D spaces of constant curvature and separable in the so-called geodesic polar coordinates are presented. The method proposed is applicable to any value of curvature including the case of Euclidean plane, sphere and hyperbolic plane. The main result is a generalization of Bertrand’s theorem on 2D spaces of constant curvature and covers most of the known separable and superintegrable models on such spaces (in particular, the so-called Tremblay–Turbiner–Winternitz (TTW) and Post–Winternitz (PW) models which have recently attracted some interest). -- Highlights: •Classifying 2D superintegrable, separable (polar coordinates) systems on S{sup 2}, R{sup 2}, H{sup 2}. •Construction of radial, angular potentials leading to superintegrability. •Generalization of Bertrand’s theorem covering known models, e.g. Higgs, TTW, PW, and Coulomb.

Gonera, Cezary, E-mail: cgonera@uni.lodz.pl; Kaszubska, Magdalena

2014-07-15T23:59:59.000Z

91

Constant field gradient planar coupled cavity structure  

DOE Patents [OSTI]

A cavity structure is disclosed having at least two opposing planar housing members spaced apart to accommodate the passage of a particle beam through the structure between the members. Each of the housing members have a plurality of serially aligned hollows defined therein, and also passages, formed in the members, which interconnect serially adjacent hollows to provide communication between the hollows. The opposing planar housing members are spaced and aligned such that the hollows in one member cooperate with corresponding hollows in the other member to form a plurality of resonant cavities aligned along the particle beam within the cavity structure. To facilitate the obtaining of a constant field gradient within the cavity structure, the passages are configured so as to be incrementally narrower in the direction of travel of the particle beam. In addition, the spacing distance between the opposing housing members is configured to be incrementally smaller in the direction of travel of the beam. 16 figs.

Kang, Y.W.; Kustom, R.L.

1999-07-27T23:59:59.000Z

92

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

93

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

94

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

95

`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's not make our buildings work hard when we're off on holiday! Read these simple tips to find out how. Make that are needed are turned on, and that these are turned off again as you leave the building. Don't leave any non

Wirosoetisno, Djoko

96

`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's not make our buildings work hard when we're off on holiday! Read these simple tips to find out how. Make leave the building. Don't leave any non-essential items on standby - appliances such as televisions left

Wirosoetisno, Djoko

97

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

98

This program is designed to loan bicycles to employees that are staying on-site and have no vehicle for transportation.  

E-Print Network [OSTI]

of the use of this bicycle, including any claim for personal injury or property damage. I further agree off-the-shelf from Property & Procurement Management conform to this standard. Only staff who rideThis program is designed to loan bicycles to employees that are staying on-site and have no vehicle

Ohta, Shigemi

99

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

100

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

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

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

102

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

103

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 García

2014-01-01T23:59:59.000Z

104

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

105

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

106

Observational constraints on holographic dark energy with varying gravitational constant  

SciTech Connect (OSTI)

We use observational data from Type Ia Supernovae (SN), Baryon Acoustic Oscillations (BAO), Cosmic Microwave Background (CMB) and observational Hubble data (OHD), and the Markov Chain Monte Carlo (MCMC) method, to constrain the cosmological scenario of holographic dark energy with varying gravitational constant. We consider both flat and non-flat background geometry, and we present the corresponding constraints and contour-plots of the model parameters. We conclude that the scenario is compatible with observations. In 1? we find ?{sub ?0} = 0.72{sup +0.03}{sub ?0.03}, ?{sub k0} = ?0.0013{sup +0.0130}{sub ?0.0040}, c = 0.80{sup +0.19}{sub ?0.14} and ?{sub G}?G'/G = ?0.0025{sup +0.0080}{sub ?0.0050}, while for the present value of the dark energy equation-of-state parameter we obtain w{sub 0} = ?1.04{sup +0.15}{sub ?0.20}.

Lu, Jianbo; Xu, Lixin [Institute of Theoretical Physics, School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian, 116024 (China); Saridakis, Emmanuel N. [College of Mathematics and Physics, Chongqing University of Posts and Telecommunications, Chongqing, 400065 (China); Setare, M.R., E-mail: lvjianbo819@163.com, E-mail: msaridak@phys.uoa.gr, E-mail: rezakord@ipm.ir, E-mail: lxxu@dlut.edu.cn [Department of Science of Bijar, University of Kurdistan, Bijar (Iran, Islamic Republic of)

2010-03-01T23:59:59.000Z

107

Must . . . stay . . . strong!  

E-Print Network [OSTI]

It is a recurring matra that epistemic must creates a statement that is weaker than the corresponding flat-footed assertion: It must be raining vs. It’s raining. Contrary to classic discussions of the phenomenon such as ...

von Fintel, Kai

108

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 

109

Experimental determination of the effective strong coupling constant  

SciTech Connect (OSTI)

We extract an effective strong coupling constant from low Q2 data on the Bjorken sum. Using sum rules, we establish its Q2-behavior over the complete Q2-range. The result is compared to effective coupling constants extracted from different processes and to calculations based on Schwinger-Dyson equations, hadron spectroscopy or lattice QCD. Although the connection between the experimentally extracted effective coupling constant and the calculations is not clear, the results agree surprisingly well.

Alexandre Deur; Volker Burkert; Jian-Ping Chen; Wolfgang Korsch

2005-09-15T23:59:59.000Z

110

Computing the Grothendieck constant of some graph classes  

E-Print Network [OSTI]

Jun 10, 2011 ... However this is not the case for the clique-web inequalities, ... Keywords: Grothendieck constant, elliptope, cut polytope, clique-web inequality.

2011-06-10T23:59:59.000Z

111

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

112

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

113

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.

114

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

115

Initial data sets with ends of cylindrical type: I. The Lichnerowicz equation  

E-Print Network [OSTI]

We construct large classes of vacuum general relativistic initial data sets, possibly with a cosmological constant Lambda, containing ends of cylindrical type.

Piotr T. Chru?ciel; Rafe Mazzeo

2014-10-07T23:59:59.000Z

116

Evolving Lorentzian wormholes supported by phantom matter and cosmological constant  

SciTech Connect (OSTI)

In this paper we study the possibility of sustaining an evolving wormhole via exotic matter made of phantom energy in the presence of a cosmological constant. We derive analytical evolving wormhole geometries by supposing that the radial tension of the phantom matter, which is negative to the radial pressure, and the pressure measured in the tangential directions have barotropic equations of state with constant state parameters. In this case the presence of a cosmological constant ensures accelerated expansion of the wormhole configurations. More specifically, for positive cosmological constant we have wormholes which expand forever and, for negative cosmological constant we have wormholes which expand to a maximum value and then recollapse. At spatial infinity the energy density and the pressures of the anisotropic phantom matter threading the wormholes vanish; thus these evolving wormholes are asymptotically vacuum {lambda}-Friedmann models with either open or closed or flat topologies.

Cataldo, Mauricio; Campo, Sergio del; Minning, Paul; Salgado, Patricio [Departamento de Fisica, Facultad de Ciencias, Universidad del Bio-Bio, Avenida Collao 1202, Casilla 5-C, Concepcion (Chile); Instituto de Fisica, Facultad de Ciencias, Pontificia Universidad Catolica de Valparaiso, Avenida Brasil 2950, Valparaiso (Chile); Departamento de Fisica, Facultad de Ciencias Fisicas y Matematicas, Universidad de Concepcion, Casilla 160-C, Concepcion (Chile)

2009-01-15T23:59:59.000Z

117

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

118

|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

119

|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

120

Van't Hoff law for temperature dependent Langmuir constants in clathrate hydrate nanocavities  

E-Print Network [OSTI]

This work gives a van't Hoff law expression of Langmuir constants of different species for determining their occupancy in the nanocavities of clathrate hydrates. The van't Hoff law's parameters are derived from a fit with Langmuir constants calculated using a pairwise site-site interaction potential to model the anisotropic potential environment in the cavities, as a function of temperature. The parameters can be used for calculating clathrates compositions. Results are given for nineteen gas species trapped in the small and large cavities of structure types I and II [1]. The accuracy of this approach is based on a comparison with available experimental data for ethane and cyclo- propane clathrate hydrates. The numerical method applied in this work, was recently validated from a comparison with the spherical cell method based on analytical considerations [1

Lakhlifi, Azzedine

2015-01-01T23:59:59.000Z

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

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

122

Estimation of the base flow recession constant under human interference  

E-Print Network [OSTI]

J. Sci. , 248, 673–696. Szilagyi, J. (1999), On the use ofWater, 37(5), 660–662. Szilagyi, J. , Z. Bribovszki, and P.ow recession constant while Szilagyi et al. [2007], Wang and

Thomas, Brian F; Vogel, Richard M; Kroll, Charles N; Famiglietti, James S

2013-01-01T23:59:59.000Z

123

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.

Barrabčs, C

2015-01-01T23:59:59.000Z

124

arthritis remains constant: Topics by E-print Network  

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

We show that the only value of n for which the late-time matter energy density to dark energy density ratio (rmrhomrhoLambda) is constant (which could...

125

Determining coal permeabilities through constant pressure production interference testing  

E-Print Network [OSTI]

DETERMINING COAL PERMEABILITIES THROUGH CONSTANT PRESSURE PRODUCTION INTERFERENCE TESTING A Thesis by STEPHEN KURT SCHUBARTH Submitted to the Graduate College of Texas ASM University fn Partial fulfillment of the requirements for the degree... of MASTER OF SCIENCE December 1983 Major Subject: Petroleum Engineering DETERMINING COAL PERMEABILITIES THROUGH CONSTANT PRESSURE PRODUCTION INTERFERENCE TESTING A Thesis by STEPHEN KURT SCHUBARTH Approved as to style and content by: tephen A. Hold...

Schubarth, Stephen Kurt

2012-06-07T23:59:59.000Z

126

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

127

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

128

Global structure of Robinson-Trautman radiative space-times with cosmological constant  

E-Print Network [OSTI]

Robinson-Trautman radiative space-times of Petrov type II with a non-vanishing cosmological constant Lambda and mass parameter m>0 are studied using analytical methods. They are shown to approach the corresponding spherically symmetric Schwarzschild-de Sitter or Schwarzschild-anti-de Sitter solution at large retarded times. Their global structure is analyzed, and it is demonstrated that the smoothness of the extension of the metrics across the horizon, as compared with the case Lambda=0, is increased for Lambda>0 and decreased for Lambda0 exhibit explicitly the cosmic no-hair conjecture under the presence of gravitational waves.

J. Bicak; J. Podolsky

1999-01-07T23:59:59.000Z

129

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

130

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

131

Statistical theory of elastic constants of cholesteric liquid crystals  

E-Print Network [OSTI]

A statistical theory of cholesteric liquid crystals composed of short rigid biaxial molecules is presented. It is derived in the thermodynamic limit at a small density and a small twist. The uniaxial (biaxial) cholesteric phase is regarded as a distorted form of the uniaxial (biaxial) nematic phase. The chirality of the interactions and the implementation of the inversion to the rotation matrix elements are discussed in detail. General microscopic expressions for the elastic constants are derived. The expressions involve the one-particle distribution function and the potential energy of two-body short-range interactions. It is shown that the elastic constants determine the twist of the phase. The stability condition for the cholesteric and nematic phases is presented. The theory is used to study unary and binary systems. The temperature and concentration dependence of the order parameters, the elastic constants and the twist of the phase are obtained. The possibility of phase separation is not investigated.

A. Kapanowski

2009-10-20T23:59:59.000Z

132

Topological Quantization in Units of the Fine Structure Constant  

SciTech Connect (OSTI)

Fundamental topological phenomena in condensed matter physics are associated with a quantized electromagnetic response in units of fundamental constants. Recently, it has been predicted theoretically that the time-reversal invariant topological insulator in three dimensions exhibits a topological magnetoelectric effect quantized in units of the fine structure constant {alpha} = e{sup 2}/{h_bar}c. In this Letter, we propose an optical experiment to directly measure this topological quantization phenomenon, independent of material details. Our proposal also provides a way to measure the half-quantized Hall conductances on the two surfaces of the topological insulator independently of each other.

Maciejko, Joseph; /Stanford U., Phys. Dept. /Stanford U., Materials Sci. Dept. /SLAC; Qi, Xiao-Liang; /Station Q, UCSB /Stanford U., Phys. Dept. /Stanford U., Materials Sci. Dept. /SLAC; Drew, H.Dennis; /Maryland U.; Zhang, Shou-Cheng; /Stanford U., Phys. Dept. /Stanford U., Materials Sci. Dept. /SLAC

2011-11-11T23:59:59.000Z

133

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

134

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

135

Discrete canonical analysis of three dimensional gravity with cosmological constant  

E-Print Network [OSTI]

We discuss the interplay between standard canonical analysis and canonical discretization in three-dimensional gravity with cosmological constant. By using the Hamiltonian analysis, we find that the continuum local symmetries of the theory are given by the on-shell space-time diffeomorphisms, which at the action level, corresponds to the Kalb-Ramond transformations. At the time of discretization, although this symmetry is explicitly broken, we prove that the theory still preserves certain gauge freedom generated by a constant curvature relation in terms of holonomies and the Gauss's law in the lattice approach.

J. Berra-Montiel; J. E. Rosales-Quintero

2014-06-03T23:59:59.000Z

136

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

137

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

138

Period doubling, information entropy, and estimates for Feigenbaum's constants  

E-Print Network [OSTI]

The relationship between period doubling bifurcations and Feigenbaum's constants has been studied for nearly 40 years and this relationship has helped uncover many fundamental aspects of universal scaling across multiple nonlinear dynamical systems. This paper will combine information entropy with symbolic dynamics to demonstrate how period doubling can be defined using these tools alone. In addition, the technique allows us to uncover some unexpected, simple estimates for Feigenbaum's constants which relate them to log 2 and the golden ratio, phi, as well as to each other.

Reginald D. Smith

2013-08-03T23:59:59.000Z

139

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

140

Calculation of the Dimer Equilibrium Constant of Heavy Water Saturated Vapor  

E-Print Network [OSTI]

Water is the most common substance on Earth.The discovery of heavy water and its further study have shown that the change of hydrogen for deuterium leads to the significant differences in their properties.The triple point temperature of heavy water is higher,at the same time the critical temperature is lower.Experimental values of the second virial coefficient of the EOS for the vapor of normal and heavy water differ at all temperatures.This fact can influence the values of the dimerization constant for the heavy water vapor.The equilibrium properties of the dimerization process are described with the methods of chemical thermodynamics.The chemical potentials for monomers (m) and dimers (d)are the functions of their concentrations.The interactions of monomer-dimer and dimer-dimer types are taken into account within the solution of equation for chemical potentials.The obtained expression for the dimerization constant contains the contributions of these types.The averaged potentials are modeled by the Sutherlan...

Bulavin, L A; Makhlaichuk, V N

2015-01-01T23:59:59.000Z

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.


141

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

142

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

143

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.

144

Temperature and moisture dependence of dielectric constant for silica aerogels  

SciTech Connect (OSTI)

The dielectric constants of silica aerogels are among the lowest measured for any solid material. The silica aerogels also exhibit low thermal expansion and are thermally stable to temperatures exceeding 500{degrees}C. However, due to the open porosity and large surface areas for aerogels, their dielectric constants are strongly affected by moisture and temperature. This paper presents data for the dielectric constants of silica aerogels as a function of moisture content at 25{degrees}C, and as a function of temperature, for temperatures in the range from 25{degrees}C to 450{degrees}C. Dielectric constant data are also given for silica aerogels that are heat treated in dry nitrogen at 500{degrees}C, then cooled to 25{degrees}C for measurements in dry air. All measurements are made on bulk aerogel spheres at 22GHz microwave frequency, using a cavity perturbation method. The results of the dependence found here for bulk materials can be inferred to apply also to thin films of silica aerogels having similar nano-structures and densities.

Hrubesh, L.H., LLNL

1997-03-01T23:59:59.000Z

145

CAPUT DARK ENERGY TOPICS, 2013 1. The Cosmological Constant  

E-Print Network [OSTI]

CAPUT DARK ENERGY TOPICS, 2013 1 #12;1. The Cosmological Constant - The acceleration as curvature term in the Einstein field equation and not a form of dark energy. Provide a critical discussion., Rovelli C., 2010 Is dark energy really a mystery ? Nature, 466, 321 (July 2010) - Padmanabhan T., 2003

Weijgaert, Rien van de

146

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

147

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 underlying dynamics. We call it: the "micro and macro connection", and on its basis we expect that the cosmological term in Einstein's equations, Newton's coupling and the masses of all the particles in the Universe, both the dark matter particles and the ordinary baryons and leptons, should all drift with the cosmic expansion. Here we discuss specific cosmological models realizing such possibility in a way that preserves the principle of covariance of General Relativity.

Harald Fritzsch; Joan Sola

2015-03-26T23:59:59.000Z

148

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

149

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

150

Dynamical constants of structured photons with parabolic-cylindrical symmetry  

E-Print Network [OSTI]

Electromagnetic modes with parabolic-cylindrical symmetry and their dynamical variables are studied both in the classical and quantum realm. As a result, a new dynamical constant for the electromagnetic field is identified and linked to the symmetry operator which supports it.

B. M. Rodriguez-Lara; R. Jauregui

2009-05-20T23:59:59.000Z

151

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

152

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

153

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"

154

RisR1320(EN) Distance Constant of the  

E-Print Network [OSTI]

is released from a locked position of the rotor and the increasing rotation rate recorded. It is concluded­550­3003­3; ISBN 87­550­3004­1 (Internet) ISSN 0106­2840 Print: Pitney Bowes Management Services Denmark 2002 #12 second. Wind-tunnel calibrations show that for con- stant wind speed U the constant rotor angular

155

USEFUL EQUATIONS AND CONSTANTS k = 8.99 X 109  

E-Print Network [OSTI]

E E Vector Sum electU W Potential Difference: elect 0 0 WU V q q Definition Potential Energy Capacitance: Q C V Definition 0 A C d Parallel Plate, Dielectric: 0C C Dielectric Constant Energy Stored Field: qF E Definition Electric Field: 2 q E k r Magnitude (for point charge) Superposition: 1 2 3 E E

Kioussis, Nicholas

156

Global Representation of the Fine Structure Constant and its Variation  

E-Print Network [OSTI]

The fine structure constant, alpha, is shown to be proportional to the ratio of the quanta of electric and magnetic flux of force of the electron, and provides a new representation, which is global across all unit systems. Consequently, a variation in alpha was shown to manifest due to a differential change in the fraction of the quanta of electric and magnetic flux of force, while a variation in hcross.c was shown to manifest due to the common mode change. The representation is discussed with respect to the running of the fine structure constant at high energies (small distances), and a putative temporal drift. It is shown that the running of the fine structure constant is due to equal components of electric screening (polarization of vacuum) and magnetic anti-screening (magnetization of vacuum), which cause the perceived quanta of electric charge to increase at small distances, while the magnetic flux quanta decreases. This introduces the concept of the bare magnetic flux quanta as well as the bare electric charge. With regards to temporal drift, it is confirmed that it is impossible to determine which fundamental constant is varying if alpha varies.

Michael Edmund Tobar

2005-02-06T23:59:59.000Z

157

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

158

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

159

Thermodynamics of de Sitter Black Holes: Thermal Cosmological Constant  

E-Print Network [OSTI]

We study the thermodynamic properties associated with the black hole event horizon and the cosmological horizon for black hole solutions in asymptotically de Sitter spacetimes. We examine thermodynamics of these horizons on the basis of the conserved charges according to Teitelboim's method. In particular, we have succeeded in deriving the generalized Smarr formula among thermodynamical quantities in a simple and natural way. We then show that cosmological constant must decrease when one takes into account the quantum effect. These observations have been obtained if and only if cosmological constant plays the role of a thermodynamical state variable. We also touch upon the relation between inflation of our universe and a phase transition of black holes.

Yuichi Sekiwa

2006-04-10T23:59:59.000Z

160

New process to avoid emissions: Constant pressure in coke ovens  

SciTech Connect (OSTI)

A chamber pressure regulation (PROven), especially effective in regard to emission control problems of coke ovens is introduced for the first time. Because of the partial vacuum in the collecting main system, it is possible to keep the oven`s raw gas pressure constant on a low level over the full coking time. The individual pressure control for each chamber is assured directly as a function of the oven pressure by an immersion system controlling the flow resistance of the collecting main valve. The latter is a fixed-position design (system name ``FixCup``). By doing away with the interdependence of collecting main pressure and chamber pressure, a parameter seen as a coking constant could not be made variable. This opens a new way to reduce coke oven emissions and simultaneously to prevent the ovens from damage caused by air ingress into the oven.

Giertz, J.; Huhn, F. [DMT-Gesellschaft fuer Forschung und Pruefung mbH, Essen (Germany). Inst. for Cokemaking and Fuel Technology; Hofherr, K. [Thyssen Stahl AG, Duisburg (Germany)

1995-12-01T23:59:59.000Z

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

Sound damping constant for generalized theories of gravity  

SciTech Connect (OSTI)

The near-horizon metric for a black brane in anti-de Sitter space and the metric near the AdS boundary both exhibit hydrodynamic behavior. We demonstrate the equivalence of this pair of hydrodynamic systems for the sound mode of a conformal theory. This is first established for Einstein's gravity, but we then show how the sound damping constant will be modified from its Einstein form for a generalized theory. The modified damping constant is expressible as the ratio of a pair of gravitational couplings that are indicative of the sound-channel class of gravitons. This ratio of couplings differs from both that of the shear diffusion coefficient and the shear viscosity to entropy ratio. Our analysis is mostly limited to conformal theories, but suggestions are made as to how this restriction might eventually be lifted.

Brustein, Ram [Department of Physics, Ben-Gurion University, Beer-Sheva, 84105 (Israel); Medved, A. J. M. [Physics Department, University of Seoul, Seoul 130-743 (Korea, Republic of)

2009-06-15T23:59:59.000Z

162

Asymptotically Flat Wormhole Solutions in a Generic Cosmological Constant Background  

E-Print Network [OSTI]

There are a number of reasons to study wormholes with generic cosmological constant $\\Lambda$. Recent observations indicate that present accelerating expansion of the universe demands $\\Lambda>0$. On the other hand, some extended theories of gravitation such as supergravity and superstring theories posses vacuum states with $\\Lambdaenergy density and pressure profiles which support such a geometry are obtained. It is shown that for having such a geometry, the wormhole throat $r_0$, the cosmological constant $\\Lambda$ and the equation of state parameter $\\omega$ should satisfy two specific conditions. The possibility of setting different values for the parameters of the model helps us to find exact solutions for the metric functions, mass functions and energy-momentum profiles. At last, the volume integral quantifier, which provides useful information about the total amount of energy condition violating matter is discussed briefly.

Y. Heydarzade; N. Riazi; H. Moradpour

2015-01-09T23:59:59.000Z

163

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

164

Turbine blade having a constant thickness airfoil skin  

DOE Patents [OSTI]

A turbine blade is provided for a gas turbine comprising: a support structure comprising a base defining a root of the blade and a framework extending radially outwardly from the base, and an outer skin coupled to the support structure framework. The skin has a generally constant thickness along substantially the entire radial extent thereof. The framework and the skin define an airfoil of the blade.

Marra, John J

2012-10-23T23:59:59.000Z

165

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

166

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

167

Laboratory evaluation of the constant rate of strain and constant head techniques for measurement of the hydraulic conductivity of fine grained soils  

E-Print Network [OSTI]

This thesis evaluates the constant rate of strain and constant head techniques for measurement of the hydraulic conductivity of fine grained soils. A laboratory program compares hydraulic conductivity measurements made ...

Adams, Amy Lynn

2011-01-01T23:59:59.000Z

168

Transportation Demand  

Annual Energy Outlook 2013 [U.S. Energy Information Administration (EIA)]

Annual 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...

169

Instructions to obtain the FBI background check Long-Stay Valencia Students The FBI Background Check is the first step in a two-part process. The FBI Background Check takes 4-6  

E-Print Network [OSTI]

Instructions to obtain the FBI background check Long-Stay Valencia Students The FBI Background Check is the first step in a two-part process. The FBI Background Check takes 4-6 weeks for processing form, fingerprint card and payment--to the following address: FBI CJIS Division ­ Record Request 1000

Hull, Elaine

170

Types of Costs Types of Cost Estimates  

E-Print Network [OSTI]

· Types of Costs · Types of Cost Estimates · Methods to estimate capital costs MIN E 408: Mining% accuracy. ­ 2-5% of pre-production capital Types of Cost Estimates #12;3. Definitive ­ Based on definitive-even $ Production Level Fixed Cost Break-even $ Production Level Cost-Revenue Relationships · Capital Costs (or

Boisvert, Jeff

171

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

172

Compatibility of neutron star masses and hyperon coupling constants  

E-Print Network [OSTI]

It is shown that the modern equations of state for neutron star matter based on microscopic calculations of symmetric and asymmetric nuclear matter are compatible with the lower bound on the maximum neutron-star mass for a certain range of hyperon coupling constants, which are constrained by the binding energies of hyperons in symmetric nuclear matter. The hyperons are included by means of the relativistic Hartree-- or Hartree--Fock approximation. The obtained couplings are also in satisfactory agreement with hypernuclei data in the relativistic Hartree scheme. Within the relativistic Hartree--Fock approximation hypernuclei have not been investigated so far.

H. Huber; M. K. Weigel; F. Weber

1998-11-30T23:59:59.000Z

173

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

174

Silica aerogel: An intrinsically low dielectric constant material  

SciTech Connect (OSTI)

Silica aerogels are highly porous solids having unique morphologies in wavelength of visible which both the pores and particles have sizes less than the wavelength of visible light. This fine nanostructure modifies the normal transport mechanisms within aerogels and endows them with a variety of exceptional physical properties. For example, aerogels have the lowest measured thermal conductivity and dielectric constant for any solid material. The intrinsically low dielectric properties of silica aerogels are the direct result of the extremely high achievable porosities, which are controllable over a range from 75% to more than 99.8 %, and which result in measured dielectric constants from 2.0 to less than 1.01. This paper discusses the synthesis of silica aerogels, processing them as thin films, and characterizing their dielectric properties. Existing data and other physical characteristics of bulk aerogels (e.g., thermal stablity, thermal expansion, moisture adsorption, modulus, dielectric strength, etc.), which are useful for evaluating them as potential dielectrics for microelectronics, are also given.

Hrubesh, L.W.

1995-04-01T23:59:59.000Z

175

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

176

Energy Levels Of Hydrogen-Like Atomsand Fundamental Constants  

E-Print Network [OSTI]

The present review includes the description of theoretical methods for the investigations of the spectra of hydrogen-like systems. Various versions of the quasipotential approach and the method of the effective Dirac equation are considered. The new methods, which have been developed in the eighties, are described. These are the method for the investigation of the spectra by means of the quasipotential equation with the relativistic reduced mass and the method for a selection of the logarithmic corrections by means of the renormalization group equation. The special attention is given to the construction of a perturbation theory and the selection of graphs, whereof the contributions of different orders of $\\alpha$, the fine structure constant, to the energy of the fine and hyperfine splitting in a positronium, a muonium and a hydrogen atom could be calculated. In the second part of this article the comparison of the experimental results and the theoretical results concerning the wide range of topics is produced. They are the fine and hyperfine splitting in the hydrogenic systems, the Lamb shift and the anomalous magnetic moments of an electron and a muon. Also, the problem of the precision determination of a numerical value of the fine structure constant, connected with the above topics, is discussed.

Valeri V. Dvoeglazov; Rudolf N. Faustov; Yuri N. Tyukhtyaev

1994-03-27T23:59:59.000Z

177

Constant power speed range extension of surface mounted PM motors  

DOE Patents [OSTI]

A circuit and method for controlling a rotating machine (11) in the constant horsepower range above base speed uses an inverter (15) having SCR's (T1-T6) connected in series with the primary commutation switches (Q1-Q6) to control turn off of the primary commutation switches and to protect the primary commutation switches from faults. The primary commutation switches (Q1-Q6) are controlled by a controller (14), to fire in advance or after a time when the back emf equals the applied voltage, and then to turn off after a precise dwell time, such that suitable power is developed at speeds up to at least six times base speed.

Lawler, Jack Steward (Knoxville, TN); Bailey, John Milton (Knoxville, TN)

2001-01-01T23:59:59.000Z

178

Determination of the electron–phonon coupling constant in tungsten  

SciTech Connect (OSTI)

We used two methods to determine the effective electron-phonon coupling constant (G{sub 0}) in tungsten. Our first principles calculations predict G{sub 0}?=?1.65?×?10{sup 17?}W m{sup ?3} K{sup ?1}. The temporal decay of the femtosecond-resolution optical reflectivity for a (100) surface of bulk W was measured using a pump-probe scheme and analysed using ab initio parameterised two temperature model, which includes both the effects of the electron-phonon coupling and thermal conduction into bulk. This analysis gives G{sub 0}?=?1.4(3)?×?10{sup 17?}W m{sup ?3} K{sup ?1}, in good agreement with the theoretical prediction. The described effective method of calculating and measuring G{sub 0} in bulk materials can be easily extended to other metals.

Daraszewicz, Szymon L.; Duffy, Dorothy M.; Shluger, Alexander L. [Department of Physics and Astronomy, London Centre for Nanotechnology, University College London, Gower Street, WC1E 6BT London (United Kingdom); Giret, Yvelin [Department of Physics and Astronomy, London Centre for Nanotechnology, University College London, Gower Street, WC1E 6BT London (United Kingdom); The Institute of Scientific and Industrial Research (ISIR), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047 (Japan); Tanimura, Hiroshi; Tanimura, Katsumi [The Institute of Scientific and Industrial Research (ISIR), Osaka University, Mihogaoka 8-1, Ibaraki, Osaka 567-0047 (Japan)

2014-07-14T23:59:59.000Z

179

Temperature relationship of the elastic constants of vanadium  

SciTech Connect (OSTI)

Information on the elastic constants of vanadium and their temperature relationship is limited and ambiguous. This article gives the values of these characteristics for VEL-2 electron beam remelted vanadium with a purity of about 99.8%. The elastic properties were measured in heating from 20 to 1600/sup 0/C in a vacuum. The relationship of the modulus of elasticity to temperature has two almost linear portions in the 20-300 and 300-1350/sup 0/C ranges and then a more intense reduction in it is observed. The shear modulus drops sharply starting with 800/sup 0/C and decreases to G = 36 kN/mm/sup 2/ at 1600/sup 0/C. Poisson's ratio has values close to 0.3. Its most significant increase starts with 1400/sup 0/C.e

Belousov, O.K.

1987-09-01T23:59:59.000Z

180

Nonzero cosmological constant and the many vacua world  

E-Print Network [OSTI]

The idea of the quantum state of the Universe described by some density matrix, i.e mixture of at least two vacua, the trivial symmetric and the nontrivial one with spontaneously broken symmetry is discussed. Nonzero cosmological constant necessarily arises for such a state and has the observable value if one takes the axion mass for the vacuum expectation value. The Higgs model, Nambu's model and discrete symmetry breaking are considered. Human observers can observe only the world on the nonsymmetric vacuum, the world on the other vacuum is some dark matter. Gravity is due to action of two worlds. Tachyons nonobservable for visible matter can be present in the dark matter, leading to some effects of nonlocality in the space of the Universe.

A. A. Grib

2003-11-14T23:59:59.000Z

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.


181

Span Programs for Functions with Constant-Sized 1-certificates  

E-Print Network [OSTI]

Besides the Hidden Subgroup Problem, the second large class of quantum speed-ups is for functions with constant-sized 1-certificates. This includes the OR function, solvable by the Grover algorithm, the distinctness, the triangle and other problems. The usual way to solve them is by quantum walk on the Johnson graph. We propose a solution for the same problems using span programs. The span program is a computational model equivalent to the quantum query algorithm in its strength, and yet very different in its outfit. We prove the power of our approach by designing a quantum algorithm for the triangle problem with query complexity $O(n^{35/27})$ that is better than $O(n^{13/10})$ of the best previously known algorithm by Magniez et al.

Aleksandrs Belovs

2011-05-20T23:59:59.000Z

182

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

183

Lieb-Liniger gas in a constant-force potential  

SciTech Connect (OSTI)

We use Gaudin's Fermi-Bose mapping operator to calculate exact solutions for the Lieb-Liniger model in a linear (constant-force) potential (the constructed exact stationary solutions are referred to as the Lieb-Liniger-Airy wave functions). The ground-state properties of the gas in the wedgelike trapping potential are calculated in the strongly interacting regime by using Girardeau's Fermi-Bose mapping and the pseudopotential approach in the 1/c approximation (c denotes the strength of the interaction). We point out that quantum dynamics of Lieb-Liniger wave packets in the linear potential can be calculated by employing an N-dimensional Fourier transform as in the case of free expansion.

Jukic, D.; Galic, S.; Buljan, H. [Department of Physics, University of Zagreb, Bijenicka c. 32, 10000 Zagreb (Croatia); Pezer, R. [Faculty of Metallurgy, University of Zagreb, Aleja narodnih heroja 3, 44103 Sisak (Croatia)

2010-08-15T23:59:59.000Z

184

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

185

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

186

Staying Safe University of Maryland  

E-Print Network [OSTI]

into the house. Keep matches and lighters up high, out of children's sight and reach. Heating equipment that can burn. Never use a candle if oxygen is be- ing used in the home. Have flashlights and battery the tree lights when you go to bed or leave the house. There are a variety of situations that lead

Rubloff, Gary W.

187

Staying Safe in Earthquake Country  

E-Print Network [OSTI]

Fullerton Shari McMahan and Dorota Huizinga 16 Rethinking Faculty Development: Toward Sustaining a Community

de Lijser, Peter

188

Dimensions of Wellness Staying Well  

E-Print Network [OSTI]

to protect your physical health by eating a well-balanced diet, getting plenty of physical activity-evaluation and self-assessment. Wellness involves continually learning and making changes to enhance your state) A state in which your mind is engaged in lively interaction with the world around you. Intellectual

Fernandez, Eduardo

189

staying safe at MMU Cheshire  

E-Print Network [OSTI]

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

190

Types of Costs Types of Cost Estimates  

E-Print Network [OSTI]

05-1 · Types of Costs · Types of Cost Estimates · Methods to estimate capital costs MIN E 408-Revenue Relationships · Capital Costs (or first cost or capital investment): ­ Expenditures made to acquire or develop capital assets ­ Three main classes of capital costs: 1. Depreciable Investment: · Investment allocated

Boisvert, Jeff

191

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"

192

Polynomial Constants are Decidable ? Markus Muller-Olm 1 and Helmut Seidl 2  

E-Print Network [OSTI]

Polynomial Constants are Decidable ? Markus Muller-Olm 1 and Helmut Seidl 2 1 University are #12;nite constants [19]. This motivated Muller-Olm and Ruthing [16] to study the complexity

Seidl, Helmut

193

Polynomial Constants are Decidable # Markus MullerOlm 1 and Helmut Seidl 2  

E-Print Network [OSTI]

Polynomial Constants are Decidable # Markus MË?uller­Olm 1 and Helmut Seidl 2 1 University]. This motivated MË?uller­Olm and RË?uthing [16] to study the complexity of constant propagation for classes

MĂĽller-Olm, Markus

194

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

195

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 Ă  une Ă©tude de l'oscillateur optique. Abstract. 2014 A method for obtaining the optical constants

Paris-Sud XI, Université de

196

A CONSTANT-INVENTORY TACTICAL PLANNING MODEL FOR A JOB SHOP  

E-Print Network [OSTI]

A CONSTANT-INVENTORY TACTICAL PLANNING MODEL FOR A JOB SHOP Stephen C. Graves Massachusetts a constant-inventory tactical planning model for a generic manufacturing system, such as a job shop assume that we can regulate the release of work to the shop to maintain the constant-inventory constraint

Graves, Stephen C.

197

De Sitter brane-world, localization of gravity, and the cosmological constant  

SciTech Connect (OSTI)

Cosmological models with a de Sitter 3-brane embedded in a 5-dimensional de Sitter spacetime (dS{sub 5}) give rise to a finite 4D Planck mass similar to that in Randall-Sundrum (RS) brane-world models in anti-de Sitter 5-dimensional spacetime(AdS{sub 5}). Yet, there arise a few important differences as compared to the results with a flat 3-brane or 4D Minkowski spacetime. For example, the mass reduction formula (MRF) M{sub Pl}{sup 2}=M{sub (5)}{sup 3}l{sub AdS} as well as the relationship M{sub Pl}{sup 2}=M{sub Pl(4+n)}{sup n+2}L{sup n} (with L being the average size or the radius of the n extra dimensions) expected in models of product-space (or Kaluza-Klein) compactifications get modified in cosmological backgrounds. In an expanding universe, a physically relevant MRF encodes information upon the 4-dimensional Hubble expansion parameter, in addition to the length and mass parameters L, M{sub Pl}, and M{sub Pl(4+n)}. If a bulk cosmological constant is present in the solution, then the reduction formula is further modified. With these new insights, we show that the localization of a massless 4D graviton as well as the mass hierarchy between M{sub Pl} and M{sub Pl(4+n)} can be explained in cosmological brane-world models. A notable advantage of having a 5D de Sitter bulk is that in this case the zero-mass wave function is normalizable, which is not necessarily the case if the bulk spacetime is anti-de Sitter. In spacetime dimensions D{>=}7, however, the bulk cosmological constant {Lambda}{sub b} can take either sign ({Lambda}{sub b}<0, =0, or >0). The D=6 case is rather inconclusive, in which case {Lambda}{sub b} may be introduced together with 2-form gauge field (or flux). We obtain some interesting classical gravity solutions that compactify higher-dimensional spacetime to produce a Robertson-Walker universe with de Sitter-type expansion plus one extra noncompact direction. We also show that such models can admit both an effective 4-dimensional Newton constant that remains finite and a normalizable zero-mode graviton wave function.

Neupane, Ishwaree P. [Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8041 (New Zealand)

2011-04-15T23:59:59.000Z

198

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

199

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

200

Types of Reuse  

Broader source: Energy.gov [DOE]

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.

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

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

202

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

203

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

204

Hydraulic conductivity testing of geosynthetic clay liners (GCLs) using the constant volume method  

SciTech Connect (OSTI)

Hydraulic conductivity tests were conducted using open and constant-volume permeation systems on specimens from a geosynthetic clay liner (GCL). Two constant volume (CV) systems were employed: the falling-head constant-volume (FHCV) system and the constant-head constant-volume (CHCV) system. A conventional burette system using pressurized air was employed for the open system (OS) tests. The test results show that hydraulic conductivity tests can be conducted 30 or more times faster with the FHCV and CHCV systems than with an open system. Typically the permeation portion of the FHCV and CHCV tests can be conducted in one-half day. Slightly lower hydraulic conductivities are measured with the CV systems due to the slightly higher effective stress applied during testing with these systems. The CHCV system has several advantages over the FHCV system, including minimizing initial transient behavior, constant applied effective stress during testing, and simpler calculations.

Wang, X.; Benson, C.H.

1999-12-01T23:59:59.000Z

205

Does the measured value of the Planck constant depend on the energy of measurements?  

E-Print Network [OSTI]

The measurement of the Avogadro constant opened the way to a comparison of the watt-balance measurements of the Planck constant with the values calculated from the quotients of the Planck constant and the mass of a particle or an atom. Since the energy scales of these measurements span nine energy decades, these data provide insight into the consistency of our understanding of physics.

Massa, Enrico; Jentschel, Michael

2011-01-01T23:59:59.000Z

206

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.

207

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

208

Froissart Bound on Inelastic Cross Section Without Unknown Constants  

E-Print Network [OSTI]

Assuming that axiomatic local field theory results hold for hadron scattering, Andr\\'e Martin and S. M. Roy recently obtained absolute bounds on the D-wave below threshold for pion-pion scattering and thereby determined the scale of the logarithm in the Froissart bound on total cross sections in terms of pion mass only. Previously, Martin proved a rigorous upper bound on the inelastic cross-section $\\sigma_{inel}$ which is one-fourth of the corresponding upper bound on $\\sigma_{tot}$, and Wu, Martin,Roy and Singh improved the bound by adding the constraint of a given $\\sigma_{tot}$. Here we use unitarity and analyticity to determine, without any high energy approximation, upper bounds on energy averaged inelastic cross sections in terms of low energy data in the crossed channel. These are Froissart-type bounds without any unknown coefficient or unknown scale factors and can be tested experimentally. Alternatively, their asymptotic forms,together with the Martin-Roy absolute bounds on pion-pion D-waves below t...

Martin, André

2015-01-01T23:59:59.000Z

209

Some Optimizations of Hardware Multiplication by Constant Matrices Nicolas Boullis, Arnaud Tisserand  

E-Print Network [OSTI]

are achieved. 1 Introduction Important optimizations of the speed, area and power consumption of circuits can of this operation frequency. The problem of the optimization of multiplication by constant has been studiedSome Optimizations of Hardware Multiplication by Constant Matrices Nicolas Boullis, Arnaud

California at Davis, University of

210

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

211

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

212

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.

213

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

214

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

215

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

216

DETERMINING OPTICAL CONSTANTS OF URANIUM NITRIDE THIN FILMS IN THE EXTREME  

E-Print Network [OSTI]

DETERMINING OPTICAL CONSTANTS OF URANIUM NITRIDE THIN FILMS IN THE EXTREME ULTRAVIOLET (1.6-35 NM deposition and characterization of reactively-sputtered uranium nitride thin films. I also report optical.1 Application 1 1.2 Optical Constants 2 1.3 Project Focus 7 2 Uranium Nitride Thin Films 8 2.1 Sputtering 8 2

Hart, Gus

217

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.

218

Expression des constantes de distorsion centrifuge des hexafluorures en fonction des frquences harmoniques.  

E-Print Network [OSTI]

'application est faite aux molécules SF6 et UF6. 4 constantes cubiques de SF6 ont été déterminées à partir des for the centrifugal distortion constants as a function of harmonic frequencies ; application is made to SF6 and UF6. 4

Paris-Sud XI, Université de

219

Evolution of the coupling constant in SU(2) lattice gauge theory with two adjoint fermions  

E-Print Network [OSTI]

We measure the evolution of the coupling constant using the Schroedinger functional method in the lattice formulation of SU(2) gauge theory with two massless Dirac fermions in the adjoint representation. We observe strong evidence for an infrared fixed point, where the theory becomes conformal. We measure the continuum beta-function and the coupling constant as a function of the energy scale.

Ari J. Hietanen; Kari Rummukainen; Kimmo Tuominen

2009-11-24T23:59:59.000Z

220

STATE OF CALIFORNIA CONSTANT VOLUME SINGLE ZONE UNITARY AIR CONDITIONER AND HEAT PUMP SYSTEMS  

E-Print Network [OSTI]

STATE OF CALIFORNIA CONSTANT VOLUME SINGLE ZONE UNITARY AIR CONDITIONER AND HEAT PUMP SYSTEMS CEC Volume Single Zone Unitary Air Conditioner and Heat Pump Systems (Page 1 of 4) Project Name CONSTANT VOLUME SINGLE ZONE UNITARY AIR CONDITIONER AND HEAT PUMP SYSTEMS CEC-MECH-3A (Revised 08

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

ANALYSIS OF ANISOTROPY IN ELASTIC CONSTANTS OF SiCp/2124 Al METAL MATRIX COMPOSITES  

E-Print Network [OSTI]

ANALYSIS OF ANISOTROPY IN ELASTIC CONSTANTS OF SiCp/2124 Al METAL MATRIX COMPOSITES H.K. Jung* , Y; Metal matrix composite; Elastic constants; Aspect ratio; Anisotropy 1. Introduction Metal matrix composites (MMCs) are becoming attractive materials for advanced aerospace structures because

Hong, Soon Hyung

222

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

223

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

224

Cosmic constraint on unified model of dark sectors in flat and non-flat varying gravitational constant theory  

E-Print Network [OSTI]

Observations indicate that most universal matter are invisible and gravitational constant $G(t)$ maybe depends on the time. The theory of variation of $G$ (VG) is explored in this paper, with naturally resulting to the invisible components in universe. We utilize the observational data: lookback time data, model-independent gamma ray bursts data, growth function of matter linear perturbations, type Ia supernovae data with systematic errors, cosmic microwave background, and baryon acoustic oscillation data from the radial scale measurement and the peak-positions measurement, to restrict the unified model (UM) of dark components in VG theory. Using the best-fit values of parameters with the covariance matrix, constraints on the variation of $G$ are $(\\frac{G}{G_{0}})_{z=3.5}\\simeq 1.0003^{+0.0014}_{-0.0016}$ and $(\\frac{\\dot{G}}{G})_{today}\\simeq 0.7977^{+2.3566}_{-2.3566}\\times 10^{-13} yr^{-1}$ in a flat geometry, the small uncertainties around constants. Limit on equation of state of dark matter is $w_{0dm}=...

Lu, Jianbo; Wu, Yabo; Xu, Lixin

2015-01-01T23:59:59.000Z

225

Bounds and self-consistent estimates for elastic constants of granular polycrystals composed of orthorhombics or crystal with higher symmetries  

SciTech Connect (OSTI)

Methods for computing Hashin-Shtrikman bounds and related self-consistent estimates of elastic constants for polycrystals composed of crystals having orthorhombic symmetry have been known for about three decades. However, these methods are underutilized, perhaps because of some perceived difficulties with implementing the necessary computational procedures. Several simplifications of these techniques are introduced, thereby reducing the overall computational burden, as well as the complications inherent in mapping out the Hashin-Shtrikman bounding curves. The self-consistent estimates of the effective elastic constants are very robust, involving a quickly converging iteration procedure. Once these self-consistent values are known, they may then be used to speed up the computations of the Hashin-Shtrikman bounds themselves. It is shown furthermore that the resulting orthorhombic polycrystal code can be used as well to compute both bounds and self-consistent estimates for polycrystals of higher-symmetry tetragonal, hexagonal, and cubic (but not trigonal) materials. The self-consistent results found this way are shown to be the same as those obtained using the earlier methods, specifically those methods designed specially for each individual symmetry type. But the Hashin-Shtrikman bounds found using the orthorhombic code are either the same or (more typically) tighter than those found previously for these special cases (i.e., tetragonal, hexagonal, and cubic). The improvement in the Hashin-Shtrikman bounds is presumably due to the additional degrees of freedom introduced into the available search space.

Berryman, J. G.

2011-02-01T23:59:59.000Z

226

Document Type: Subject Terms  

E-Print Network [OSTI]

Title: Authors: Source: Document Type: Subject Terms: Abstract: Full Text Word Count: ISSN at creating team results. In fact, it's priceless. Managers in Western corporations have received a lifetime

Major, Arkady

227

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

2014-11-03T23:59:59.000Z

228

Behavior of type 304 and type 316 austenitic stainless in 55% lithium bromide heavy brine environments  

SciTech Connect (OSTI)

Cylindrical tensile specimens of AISI type 304 (UNS S30400) and type 316 (UNS S31600) stainless steels (SS) were tested under constant-load conditions in 55% lithium bromide (LiBr) heavy brines at temperatures of 120 C and 140 C. Elongation and open-circuit potential (OCP) were recorded during the tensile test. Potentiodynamic polarization measurements were conducted, and the failed surface fractures were examined by scanning electron microscopy. The tested SS were subjected to stress corrosion under the test environments. Sensitivity was affected strongly by pH values. In LiBr brine of pH = 11.6, the passivation processes were more effective than in brine of pH = 6 [approximately] 8. Because of effective passivation behavior in brine of pH = 11.6, lower values of [delta]l[sub 0] were measured, indicating lower dislocation relaxation processes and high resistance to stress corrosion cracking.

Itzhak, D.; Elias, O. (Ben-Gurion Univ., Beer-Sheva (Israel). Dept. of Materials Engineering)

1994-02-01T23:59:59.000Z

229

Wave functions and decay constants of $B$ and $D$ mesons in the relativistic potential model  

E-Print Network [OSTI]

With the decay constants of $D$ and $D_s$ mesons measured in experiment recently, we revisit the study of the bound states of quark and antiquark in $B$ and $D$ mesons in the relativistic potential model. The relativistic bound state wave equation is solved numerically. The masses, decay constants and wave functions of $B$ and $D$ mesons are obtained. Both the masses and decay constants obtained here can be consistent with the experimental data. The wave functions can be used in the study of $B$ and $D$ meson decays.

Mao-Zhi Yang

2012-01-30T23:59:59.000Z

230

Decay constants of the pion and its excitations on the lattice.  

SciTech Connect (OSTI)

We present a calculation using lattice QCD of the ratios of decay constants of the excited states of the pion, to that of the pion ground state, at three values of the pion mass between 400 and 700 MeV, using an anisotropic clover fermion action with three flavors of quarks. We find that the decay constant of the first excitation, and more notably of the second, is suppressed with respect to that of the ground-state pion, but that the suppression shows little dependence on the quark mass. The strong suppression of the decay constant of the second excited state is consistent with its interpretation as a predominantly hybrid state.

Mastropas, Ekaterina V. [William and Mary College, JLAB; Richards, David G. [JLAB

2014-07-01T23:59:59.000Z

231

Leptonic B- and D-meson decay constants with 2+1 flavors of asqtad fermions  

E-Print Network [OSTI]

We present the status of our updated D- and B-meson decay-constant analysis, based on the MILC $N_f = 2+1$ asqtad gauge ensembles. Heavy quarks are incorporated using the Wilson clover action with the Fermilab interpretation. This analysis includes ensembles at five lattice spacings from a $\\approx$ 0.045 to 0.15 fm, and light sea-quark masses down to 1/20th of the strange-quark mass. Projected error budgets for ratios of decay constants, in particular between bottom- and charm-meson decay constants, are presented.

Kronfeld, Andreas S; Simone, James N; Van de Water, Ruth S

2015-01-01T23:59:59.000Z

232

Leptonic B- and D-meson decay constants with 2+1 flavors of asqtad fermions  

E-Print Network [OSTI]

We present the status of our updated D- and B-meson decay-constant analysis, based on the MILC $N_f = 2+1$ asqtad gauge ensembles. Heavy quarks are incorporated using the Wilson clover action with the Fermilab interpretation. This analysis includes ensembles at five lattice spacings from a $\\approx$ 0.045 to 0.15 fm, and light sea-quark masses down to 1/20th of the strange-quark mass. Projected error budgets for ratios of decay constants, in particular between bottom- and charm-meson decay constants, are presented.

Andreas S. Kronfeld; Ethan T. Neil; James N. Simone; Ruth S. Van de Water; for the Fermilab Lattice Collaboration; for the MILC Collaboration

2015-01-08T23:59:59.000Z

233

Mid-Infrared Plasmonic Platform based on Heavily Doped Epitaxial Ge-on-Si: Retrieving the Optical Constants of Thin Ge Epilayers  

E-Print Network [OSTI]

The n-type Ge-on-Si epitaxial material platform enables a novel paradigm for plasmonics in the mid-infrared, prompting the future development of lab-on-a-chip and subwavelength vibrational spectroscopic sensors. In order to exploit this material, through proper electrodynamic design, it is mandatory to retrieve the dielectric constants of the thin Ge epilayers with high precision due to the difference from bulk Ge crystals. Here we discuss the procedure we have employed to extract the real and imaginary part of the dielectric constants from normal incidence reflectance measurements, by combining the standard multilayer fitting procedure based on the Drude model with Kramers-Kronig transformations of absolute reflectance data in the zero-transmission range of the thin film.

Baldassarre, Leonetta; Samarelli, Antonio; Gallacher, Kevin; Paul, Douglas J; Frigerio, Jacopo; Isella, Giovanni; Sakat, Emilie; Finazzi, Marco; Biagioni, Paolo; Ortolani, Michele

2015-01-01T23:59:59.000Z

234

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

235

Study of Thermal Properties of Graphene-Based Structures Using the Force Constant Method  

E-Print Network [OSTI]

Study of Thermal Properties of Graphene-Based Structures Using the Force Constant Method Hossein, 2012) Abstract The thermal properties of graphene-based materials are theoretically investigated transport is investigated for different structures including graphene, graphene antidot lat- tices

236

Research on Fuzzy Regulation Strategies in the Constant Air Volume Air Conditioning System  

E-Print Network [OSTI]

The energy consumption of the constant air volume (CAV) system largely depends on the regulation strategies. Although some air conditioning systems are equipped with automatic regulation devices, others lack effective regulation strategies. To avoid...

Bai, T.; Zhang, J.; Ning, N.; Tong, K.; Wu, Y.; Wang, H.

2006-01-01T23:59:59.000Z

237

Determination of Henry's law constants of organics in dilute aqueous solutions  

SciTech Connect (OSTI)

Accurate knowledge of Henry's law constants, H, or air/water partitioning coefficients are required to predict the behavior of organic compounds in the environment. In particular, when the compounds are relatively volatile and exhibit low solubility in water, air stripping may be a viable method for above-ground treatment. Henry's law constants of 15 volatile organic compounds in dilute aqueous solutions were measured by the procedure of equilibrium partitioning in a closed system. The method is based upon the measurement of the headspace concentration by gas chromatography. The compounds investigated included six halogenated hydrocarbons, four aromatic hydrocarbons, and five alkanes. The measurements were made at three temperatures between 25 and 45 C. The measured Henry's law constants compared well with the literature data of some liquids. The temperature dependence of Henry's law constant was also studied from the van't Hoff relation.

Hansen, K.C.; Zhou, Zhou; Yaws, C.L.; Aminabhavi, T.M. (Lamar Univ., Beaumont, TX (United States). Dept. of Chemistry)

1993-10-01T23:59:59.000Z

238

Fractal properties in fundamental force coupling constants, in atomic energies, and in elementary particle masses  

E-Print Network [OSTI]

Using the discrete-scale invariance theory, we show that the coupling constants of fundamental forces, the atomic masses and energies, and the elementary particle masses, obey to the fractal properties.

Boris Tatischeff

2011-04-28T23:59:59.000Z

239

AbstractStock-rebuilding time iso pleths relate constant levels of fishing  

E-Print Network [OSTI]

519 Abstract­Stock-rebuilding time iso pleths relate constant levels of fishing mortality (F. Iso pleths calculated in previous studies by deterministic models approximate median, rather than mean

240

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

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

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

242

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

243

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

244

Small sample size power for some tests of constant hazard function  

E-Print Network [OSTI]

1970 ABSTRACT Small Sample Size Power for Some Tests of Constant Hazard Function (December 1970) Wayne Ward Fercho, B. A. , North Dakota State University N. S. , Texas A&M University Directed by: Dr. Larry Ringer Four different tests of constant.... Moran [1951] showed that Bartlett's M test was an asymptotically most powerful test agai. nst the alternative of a gamma distribution with parameters beta and theta. Hartley [1950] stated that the loss in power of his test was negligible...

Fercho, Wayne Ward

2012-06-07T23:59:59.000Z

245

On the distribution of estimators of diffusion constants for Brownian motion  

E-Print Network [OSTI]

We discuss the distribution of various estimators for extracting the diffusion constant of single Brownian trajectories obtained by fitting the squared displacement of the trajectory. The analysis of the problem can be framed in terms of quadratic functionals of Brownian motion that correspond to the Euclidean path integral for simple Harmonic oscillators with time dependent frequencies. Explicit analytical results are given for the distribution of the diffusion constant estimator in a number of cases and our results are confirmed by numerical simulations.

Denis Boyer; David S. Dean

2011-07-26T23:59:59.000Z

246

Dust around Type Ia supernovae  

E-Print Network [OSTI]

Dust around Type Ia supernovae Lifan Wang 1,2 LawrenceIa. Subject headings: Supernovae: General, Dust, Extinctionline) bands for Type Ia supernovae. (a), upper panel, shows

Wang, Lifan

2005-01-01T23:59:59.000Z

247

Wolter type i LAMAR  

SciTech Connect (OSTI)

Observational objectives for the LAMAR and their influence on the instrument design are discussed. It is concluded that the most important design parameter is the angular resolution of the LAMAR modules since it so strongly influences sensitivity, optical identifications, source confusion, spectral resolution for objective gratings and the ability to resolve small extended sources. A high resolution Wolter Type I LAMAR module is described, its hardware status discussed, and the performance of a LAMAR observatory presented. A promising technique for enhancing the reflectivity of Wolter Type I X-ray optics in a selected bandpass at high energy has been investigated and the performance of the LAMAR module, utilizing this method, has been calculated.

Catura, R.C.; Joki, E.G.

1981-11-01T23:59:59.000Z

248

Definitions: Types of Commissioning  

E-Print Network [OSTI]

Workshop on the Continuous Commissioning® Process Joseph T. Martinez, PCC Carlos Yagua, PE Hiroko Masuda, Juan-Carlos Baltazar, PhD, PE Ahmet Ugursal, PhD Clean Air Through Energy Efficiency (CATEE) Conference, Dallas, Texas. November 18, 2014... 5. Continuous Commissioning Measures 6. Measurement and Verification ESL-KT-14-11-41 CATEE 2014: Clean Air Through Efficiency Conference, Dallas, Texas Nov. 18-20 Definitions: Types of Commissioning Joseph T. Martinez, PCC Carlos Yagua, PE Hiroko...

Martinez, J. T.

2014-01-01T23:59:59.000Z

249

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

250

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

251

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

252

The analogue cosmological constant in Bose-Einstein condensates: a lesson for quantum gravity  

E-Print Network [OSTI]

For almost a century, the cosmological constant has been a mysterious object, in relation to both its origin and its very small value. By using a Bose-Einstein condensate analogue model for gravitational dynamics, we address here the cosmological constant issue from an analogue gravity standpoint. Starting from the fundamental equations describing a system of condensed bosons, we highlight the presence of a vacuum source term for the analogue gravitational field, playing the role of a cosmological constant. In this simple system it is possible to compute from scratch the value of this constant, to compare it with other characteristic energy scales and hence address the problem of its magnitude within this framework, suggesting a different path for the solution of this longstanding puzzle. We find that, even though this constant term is related with quantum vacuum effects, it is not immediately related to the ground state energy of the condensate. On the gravity side this result suggests that the interpretation and computation of the cosmological term as a form of renormalized vacuum energy might be misleading, its origin being related to the mechanism that instead produces spacetime from its pregeometric progenitor, shedding a different light on the subject and at the same time suggesting a potentially relevant role of analogue models in the understanding of quantum gravity.

Stefano Finazzi; Stefano Liberati; Lorenzo Sindoni

2012-07-24T23:59:59.000Z

253

Forecast Technical Document Forecast Types  

E-Print Network [OSTI]

Forecast Technical Document Forecast Types A document describing how different forecast types are implemented in the 2011 Production Forecast system. Tom Jenkins Robert Matthews Ewan Mackie Lesley Halsall #12;PF2011 ­ Forecast Types Background Different `types' of forecast are possible for a specified area

254

On the Dorsal Glands as Characters of Constant Specific Value in the Coccid Genus, Parlatoria  

E-Print Network [OSTI]

Vaster Thesis Fntoaologv Palmer, Miriam 1904 On dorsal glands 0 charac­ t e r s of constant s p e c i f i c • alue in the Coccid genus, P a r l a t o r i a , On the D o r s a l Glands as Characters of Constant S p e c i f i c Value i n the Coccid... Genus, P a r l a t o r i a . Miriam A. Palmer. On the D o r s a l Glands as Characters of Constant S p e c i f i c Value i n the Coccid Genus, P a r l a t o r i a . I n t r o d u c t i o n . There has "been much confusion as to c l a s s i f i c a...

Palmer, Miriam A.

1904-01-01T23:59:59.000Z

255

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

256

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

257

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

258

Phase-constant-nonreciprocal composite right/left-handed metamaterials based on coplanar waveguides  

SciTech Connect (OSTI)

The purely phase-constant-nonreciprocal composite right-left handed metamaterial structure is proposed based on coplanar waveguides loaded with a ferrite layer. The structure exhibits considerably large nonreciprocity in phase constant which depends on the effective magnetization and whose magnitude can remain in leaky wave region of wavenumbers or can overcome a boundary to slow wave region. The nonreciprocity in amplitude of transmission coefficients, on the other hand, is effectively reduced by using a cavity-backed design to prevent undesired nonreciprocal radiation loss.

Porokhnyuk, Andrey, E-mail: d1821008@edu.kit.ac.jp; Ueda, Tetsuya; Kado, Yuichi [Department of Electronics, Kyoto Institute of Technology, Kyoto 606-8585 (Japan); Itoh, Tatsuo [Department of Electrical Engineering, University of California at Los Angeles, Los Angeles, California 90095 (United States)

2014-05-07T23:59:59.000Z

259

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

260

On the Verdet constant and Faraday rotation for graphene-like materials  

E-Print Network [OSTI]

We present a rigorous and rather self-contained analysis of the Verdet constant in graphene- like materials. We apply the gauge-invariant magnetic perturbation theory to a nearest- neighbour tight-binding model and obtain a relatively simple and exactly computable formula for the Verdet constant, at all temperatures and all frequencies of sufficiently large absolute value. Moreover, for the standard nearest neighbour tight-binding model of graphene we show that the transverse component of the conductivity tensor has an asymptotic Taylor expansion in the external magnetic field where all the coefficients of even powers are zero.

Mikkel H. Brynildsen; Horia D. Cornean

2013-02-21T23:59:59.000Z

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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
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261

Determination of foam stability at constant pressure in the Plateau-Biggs borders of the foam  

SciTech Connect (OSTI)

The lifetime of a foam column (or of a part of the column) is a parameter widely used as a characteristic of foam stability. During the destruction process, the pressure in the upper layers of the foam changes (the height H of the foam column decreases) and the lifetime of the different layers of the foam column will be different. Therefore, the lifetime of a foam column at constant pressure in the Plateau-Gibbs borders (constant along the height of the column and with time) is a much more accurate characteristic of foam stability.

Khristov, K.I.; Exerowa, D.R.; Kurgljakov, P.M.

1981-02-01T23:59:59.000Z

262

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

263

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

264

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

265

Transient Thermal and Stress Response of A Helium-Cooled Tungsten Plate-Type Divertor  

E-Print Network [OSTI]

.R. Raffray Center for Energy Research University of California, San Diego La Jolla, USA xrwang, which tend to have a negative impact on reliability. The helium-cooled plate- type divertor design maintenance or after the scheduled maintenance because of the different thermal time constants in the front

Raffray, A. René

266

Locating Faults in a Constant Number of Parallel Testing Rounds (Preliminary Version)  

E-Print Network [OSTI]

the total number of processors and t denotes the number of faulty processors. Both of these results improve processor (diagnosis­with­repair) and identifying a single good processor, we present an oblivious constant­time algorithm using a fixed 3­regular in­ terconnect that tolerates a linear number of faults. This contrasts

Beigel, Richard

267

Non-chiral fusion rules, structure constants of D_m minimal models  

E-Print Network [OSTI]

We present a technique to construct, for $D_{m}$ unitary minimal models, the non-chiral fusion rules which determines the operator content of the operator product algebra. Using these rules we solve the bootstrap equations and therefore determine the structure constants of these models. Through this approach we emphasize the role played by some discrete symmetries in the classification of minimal models.

A. Rida; T. Sami

1999-10-07T23:59:59.000Z

268

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

269

FTIR Emission Spectra, Molecular Constants, and Potential Curve of Ground State GeO  

E-Print Network [OSTI]

FTIR Emission Spectra, Molecular Constants, and Potential Curve of Ground State GeO Edward G. Lee-resolution FTIR emission spectroscopy measurements for the five common isoto- pomers of GeO are combined­9), photoelectron spectroscopy (10), electronic absorption (11­13), and emission (14) spectroscopy, and in matrix

Le Roy, Robert J.

270

EFFET DE LA DILATATION THERMIQUE SUR LA VALEUR DE LA CONSTANTE DE CURIE DES FERRITES  

E-Print Network [OSTI]

EFFET DE LA DILATATION THERMIQUE SUR LA VALEUR DE LA CONSTANTE DE CURIE DES FERRITES Par LOUIS N�EL Sommaire. - L'auteur montre que l'existence de fortes anomalies de dilatation dans les ferrites entraîne ferrites varie au-dessus de leur point de Curie, en fonction de la température absolue ~', suivant la loi

Boyer, Edmond

271

Evolving Lorentzian wormholes supported by phantom matter with constant state parameters  

SciTech Connect (OSTI)

In this paper we study the possibility of sustaining an evolving wormhole via exotic matter made out of phantom energy. We show that this exotic source can support the existence of evolving wormhole spacetimes. Explicitly, a family of evolving Lorentzian wormholes conformally related to another family of zero-tidal force static wormhole geometries is found in Einstein gravity. Contrary to the standard wormhole approach, where first a convenient geometry is fixed and then the matter distribution is derived, we follow the conventional approach for finding solutions in theoretical cosmology. We derive an analytical evolving wormhole geometry by supposing that the radial tension (which is negative to the radial pressure) and the pressure measured in the tangential directions have barotropic equations of state with constant state parameters. At spatial infinity this evolving wormhole, supported by this anisotropic matter, is asymptotically flat, and its slices t=constant are spaces of constant curvature. During its evolution the shape of the wormhole expands with constant velocity, i.e without acceleration or deceleration, since the scale factor has strictly a linear evolution.

Cataldo, Mauricio; Labrana, Pedro; Campo, Sergio del; Crisostomo, Juan; Salgado, Patricio [Departamento de Fisica, Facultad de Ciencias, Universidad del Bio-Bio, Avenida Collao 1202, Casilla 5-C, Concepcion (Chile); Instituto de Fisica, Facultad de Ciencias, Pontificia Universidad Catolica de Valparaiso, Avenida Brasil 2950, Valparaiso (Chile); Departamento de Fisica, Facultad de Ciencias Fisicas y Matematicas, Universidad de Concepcion, Casilla 160-C, Concepcion (Chile)

2008-11-15T23:59:59.000Z

272

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

273

Specific gamma-ray dose constants for nuclides important to dosimetry and radiological assessment  

SciTech Connect (OSTI)

Tables of specific gamma-ray dose constants (the unshielded gamma-ray dose equivalent rate at 1 m from a point source) have been computed for approximately 500 nuclides important to dosimetry and radiological assessment. The half life, the mean attenuation coefficient, and thickness for a lead shield providing 95% dose equivalent attenuation are also listed.

Unger, L.M.; Trubey, D.K.

1982-05-01T23:59:59.000Z

274

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

275

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.

276

Gell-Mann - Low Function in QED for the arbitrary coupling constant  

E-Print Network [OSTI]

The Gell-Mann -- Low function \\beta(g) in QED (g is the fine structure constant) is reconstructed. At large g, it behaves as \\beta_\\infty g^\\alpha with \\alpha\\approx 1, \\beta_\\infty\\approx 1.

I. M. Suslov

2006-05-10T23:59:59.000Z

277

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

278

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

E-Print Network [OSTI]

wave patterns in R 2 , in terms of the kinematic approach. These patterns include rotating waves by Winfree [13]. The kinematic approach of [8] also considered a boundary of existence of spiral waveWaves of constant shape and the structure of the \\rotors boundary" in excitable media. Yu.E. Elkin

Biktashev, Vadim N.

279

Control Humidity With Single-Duct, Single-Zone, Constant Air Volume System  

E-Print Network [OSTI]

The lecture hall of the Richardson Petroleum Building at Texas A&M University is a large lecture hall, with a total floor area of approximately 2500 ft^2. The lecture hall was served by a constant air volume (CAV) air handling unit (AHU) which had...

Chen, H.; Deng, S.; Bruner, H. L.; Claridge, D. E.

2000-01-01T23:59:59.000Z

280

Correlation between the extraordinary Hall constant and electrical resistivity minima in Co-rich metallic glasses  

E-Print Network [OSTI]

The Hall effect has been studied in some Co-rich ferromagnetic metallic glasses which show resistivity (rho) minima at low temperatures. It is found that the extraordinary Hall constant (R-s) shows a corresponding minimum. The scaling relation R...

Majumdar, AK; Khatua, PK; Rathnayaka, KDD; Naugle, Donald G.

2004-01-01T23:59:59.000Z

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.


281

Instability of non-constant harmonic maps for the 1 + 2-dimensional equivariant wave map system  

E-Print Network [OSTI]

energy har- monic map Q (a stationary solution), and show that when it exists, Q is instable in the energy space. Our result applies in particular to the case of wave maps to the sphere S2Instability of non-constant harmonic maps for the 1 + 2-dimensional equivariant wave map system

Côte, Raphaël

282

Decay of the cosmological constant: Equivalence of quantum tunneling and thermal activation in two spacetime dimensions  

SciTech Connect (OSTI)

We study the decay of the cosmological constant in two spacetime dimensions through production of pairs. We show that the same nucleation process looks as quantum-mechanical tunneling (instanton) to one Killing observer and as thermal activation (thermalon) to another. Thus, we find another striking example of the deep interplay between gravity, thermodynamics and quantum mechanics which becomes apparent in presence of horizons.

Gomberoff, Andres; Henneaux, Marc; Teitelboim, Claudio [Centro de Estudios Cientificos (CECS), Valdivia (Chile); Physique Theorique et Mathematique, Universite Libre de Bruxelles and International Solvay Institutes, ULB Campus Plaine C.P. 231, B-1050 Brussels (Belgium); Centro de Estudios Cientificos (CECS), Valdivia (Chile); Centro de Estudios Cientificos (CECS), Valdivia (Chile)

2005-03-15T23:59:59.000Z

283

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

284

Application of SiO2 aerogel film with low dielectric constant to intermetal dielectrics  

E-Print Network [OSTI]

Application of SiO2 aerogel film with low dielectric constant to intermetal dielectrics Moon-Ho Jo aerogel film was characterized from its structural and chemical viewpoints. High porosity of material infrared spectroscopy (FT-IR) for their chemical states. The improved electrical properties of SiO2 aerogel

Jo, Moon-Ho

285

Black hole solutions of dimensionally reduced Einstein-Gauss-Bonnet gravity with a cosmological constant  

SciTech Connect (OSTI)

We study the phase space of the spherically symmetric solutions of the system obtained from the dimensional reduction of the six-dimensional Einstein-Gauss-Bonnet action with a cosmological constant. We show that all the physical solutions have anti-de Sitter asymptotic behavior.

Melis, M.; Mignemi, S. [Dipartimento di Matematica, Universita di Cagliari, viale Merello 92, 09123 Cagliari (Italy) and INFN, Sezione di Cagliari (Italy)

2007-01-15T23:59:59.000Z

286

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

287

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

288

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

289

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

290

Secure Computation of Constant-Depth Circuits with Applications to Database Search Problems  

E-Print Network [OSTI]

Secure Computation of Constant-Depth Circuits with Applications to Database Search Problems Omer. Motivated by database search problems such as partial match or nearest neighbor, we present secure between k poly log(s) parties who all know C, we obtain a secure protocol for evaluating C(x) using O

Shpilka, Amir

291

Secure Computation of Constant-Depth Circuits with Applications to Database Search Problems ?  

E-Print Network [OSTI]

Secure Computation of Constant-Depth Circuits with Applications to Database Search Problems ? Omer. Motivated by database search problems such as partial match or nearest neighbor, we present secure distributed between k #21; poly log(s) parties who all know C, we obtain a secure protocol for evaluating C

Ishai, Yuval

292

Using solubility and Henry`s law constant data for ketones in water  

SciTech Connect (OSTI)

When a chemical spill occurs in water, the extent of chemical contamination is determined by the chemical`s solubility in the water. If contaminated water comes into contact with air, such as in a pond or a storage vessel, the contaminant`s emissions into the air can be determined based upon Henry`s law constant for that particular constituent. A high Henry`s law constant value translates into a greater emissions level. The engineering design and operation of strippers to remove contaminants from water require data for both water solubility and Henry`s law constant. A new correlation developed by researchers at Lamar University provides reliable values down to very, very low concentrations for the solubility of ketones in water. The correlation is based on the boiling point temperature of the ketone and can be used for engineering studies involving health, safety and environmental considerations. Results for water solubility and Henry`s law constant are provided here for a wide variety of ketones. Representative values are about 249,000 parts per million (ppm) per weight (wt) for methyl ethyl ketone (C{sub 4}H{sub 8}O) and 360 ppm/wt for 5-nonanone (C{sub 9}H{sub 18}O).

Yaws, C.L.; Sheth, S.D.; Han, M. [Lamar Univ., Beaumont, TX (United States)

1998-02-01T23:59:59.000Z

293

Fluorocarbon plasma etching and profile evolution of porous low-dielectric-constant silica  

E-Print Network [OSTI]

of PS, a feature profile model has been integrated with a plasma equipment model. To focus on issuesFluorocarbon plasma etching and profile evolution of porous low-dielectric-constant silica Arvind silicon dioxide PS is one such material. To address scaling issues during fluorocarbon plasma etching

Kushner, Mark

294

Relaxation Time Constants and Apparent Diffusion Coefficients of Rat Retina at 7 Tesla  

E-Print Network [OSTI]

Relaxation Time Constants and Apparent Diffusion Coefficients of Rat Retina at 7 Tesla Govind Nair* and ADC of the rat eyes were measured at 50 3 50 3 800 lm at 7 Tesla. Profiles of T1, T2, T2* and ADC

Duong, Timothy Q.

295

Low complexity concurrent constant modulus algorithm and soft decision directed scheme for blind  

E-Print Network [OSTI]

Low complexity concurrent constant modulus algorithm and soft decision directed scheme for blind-directed (DD) scheme provides a state-of-the-art low-complexity blind equalisation technique for high of the standard CMA blind equaliser, this concurrent CMA and DD blind equaliser achieves a dramatic improvement

Chen, Sheng

296

Combining Blind Equalization with Constant Modulus Properties Alle-Jan van der Veen and Antonio Trindade  

E-Print Network [OSTI]

Combining Blind Equalization with Constant Modulus Properties Alle-Jan van der Veen and Ant, The Netherlands Abstract This paper presents an approach to multi-user blind space- time equalizationexploiting that asks for both a blind equaliza- tion and a blind source separation based on the modulation properties

van der Veen, Alle-Jan

297

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

298

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

Ă?ien, Geir E.

299

INFRARED SPECTRA AND OPTICAL CONSTANTS OF NITRILE ICES RELEVANT TO TITAN's ATMOSPHERE  

SciTech Connect (OSTI)

Spectra and optical constants of nitrile ices known or suspected to be in Titan's atmosphere are presented from 2.0 to 333.3 {mu}m ({approx}5000-30 cm{sup -1}). These results are relevant to the ongoing modeling of Cassini CIRS observations of Titan's winter pole. Ices studied are: HCN, hydrogen cyanide; C{sub 2}N{sub 2}, cyanogen; CH{sub 3}CN, acetonitrile; C{sub 2}H{sub 5}CN, propionitrile; and HC{sub 3}N, cyanoacetylene. For each of these molecules, we also report new cryogenic measurements of the real refractive index, n, determined in both the amorphous and crystalline phases at 670 nm. These new values have been incorporated into our optical constant calculations. Spectra were measured and optical constants were calculated for each nitrile at a variety of temperatures, including, but not limited to, 20, 35, 50, 75, 95, and 110 K, in both the amorphous phase and the crystalline phase. This laboratory effort used a dedicated FTIR spectrometer to record transmission spectra of thin-film ice samples. Laser interference was used to measure film thickness during condensation onto a transparent cold window attached to the tail section of a closed-cycle helium cryostat. Optical constants, real (n) and imaginary (k) refractive indices, were determined using Kramers-Kronig analysis. Our calculation reproduces the complete spectrum, including all interference effects.

Moore, Marla H.; Hudson, Reggie [NASA Goddard Space Flight Center, Code 691, Greenbelt, MD 20771 (United States); Ferrante, Robert F. [Chemistry Department, US Naval Academy, 572 Holloway Road, Annapolis, MD 21402 (United States); James Moore, W., E-mail: Marla.h.moore@nasa.go [USRA NASA Goddard Space Flight Center, Code 691, Greenbelt, MD 20771 (United States)

2010-11-15T23:59:59.000Z

300

What do we know about delistings? A survey of the literature DJAMA Constant, University of Toulousea  

E-Print Network [OSTI]

1 What do we know about delistings? A survey of the literature DJAMA Constant, University, the decision to delist is less studied in the corporate finance literature despite its importance in the life of the firm. This article surveys the recent literature, both theoretical and empirical, regarding delisting

Paris-Sud XI, Université de

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

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

302

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

303

Rate constants for the homogeneous gas-phase Al/HCl combustion chemistry  

E-Print Network [OSTI]

Rate constants for the homogeneous gas-phase Al/HCl combustion chemistry Mark T. Swiharta Engineering, University at Buffalo (SUNY), Buffalo, NY 14260-4200, USA b Laboratoire de Combustion et Syste Orleans cedex 2, France c Laboratoire de Combustion et Syste`mes Re´actifs (LCSR), CNRS, 1C, av. de la

Swihart, Mark T.

304

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.

305

Physical interpretation of constants in the solutions to the Brans-Dicke equations  

E-Print Network [OSTI]

Using an energy-momentum complex we give a physical interpretation to the constants in the well-known static spherically symmetric asymptotically flat vacuum solution to the Brans-Dicke equations. The positivity of the tensor mass puts a bound on parameters in the solution.

Aroonkumar Beesham

1998-02-18T23:59:59.000Z

306

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.

307

Constant Asphaltene Molecular and Nanoaggregate Mass in a Gravitationally Segregated Reservoir  

E-Print Network [OSTI]

Constant Asphaltene Molecular and Nanoaggregate Mass in a Gravitationally Segregated Reservoir are typically enriched in asphaltenes. Equations of state capable of modeling these gradients have numerous or aggregates in the crude oil. Here, we explore the impact of gravity in segregating asphaltenes of different

Zare, Richard N.

308

The rate constant for radiative association of HF: Comparing quantum and classical dynamics  

SciTech Connect (OSTI)

Radiative association for the formation of hydrogen fluoride through the A{sup 1}? ? X{sup 1}?{sup +} and X{sup 1}?{sup +} ? X{sup 1}?{sup +} transitions is studied using quantum and classical dynamics. The total thermal rate constant is obtained for temperatures from 10 K to 20 000 K. Agreement between semiclassical and quantum approaches is observed for the A{sup 1}? ? X{sup 1}?{sup +} rate constant above 2000 K. The agreement is explained by the fact that the corresponding cross section is free of resonances for this system. At temperatures below 2000 K we improve the agreement by implementing a simplified semiclassical expression for the rate constant, which includes a quantum corrected pair distribution. The rate coefficient for the X{sup 1}?{sup +} ? X{sup 1}?{sup +} transition is calculated using Breit–Wigner theory and a classical formula for the resonance and direct contributions, respectively. In comparison with quantum calculations the classical formula appears to overestimate the direct contribution to the rate constant by about 12% for this transition. Below about 450 K the resonance contribution is larger than the direct, and above that temperature the opposite holds. The biggest contribution from resonances is at the lowest temperature in the study, 10 K, where it is more than four times larger than the direct. Below 1800 K the radiative association rate constant due to X{sup 1}?{sup +} ? X{sup 1}?{sup +} transitions dominates over A{sup 1}? ? X{sup 1}?{sup +}, while above that temperature the situation is the opposite.

Gustafsson, Magnus, E-mail: magngu@chem.gu.se; Monge-Palacios, M.; Nyman, Gunnar [Department of Chemistry and Molecular Biology, University of Gothenburg, 41296 Gothenburg (Sweden)] [Department of Chemistry and Molecular Biology, University of Gothenburg, 41296 Gothenburg (Sweden)

2014-05-14T23:59:59.000Z

309

Mechanism design with approximate types  

E-Print Network [OSTI]

In mechanism design, we replace the strong assumption that each player knows his own payoff type exactly with the more realistic assumption that he knows it only approximately: each player i only knows that his true type ...

Zhu, Zeyuan Allen

2012-01-01T23:59:59.000Z

310

Types of Farming in Texas.  

E-Print Network [OSTI]

.......... .......-.----------------------. 8 Labor -..-.....-----...------------------------------------------------. 9 Land Tenure .--.----....---....--------------------------------- 9 Number and Size of Farms ....----...----.-._--------- 10 Capital... -------------...-------.---------------------------- 21 Hogs -......-....--------------------------------------------------- 22 Poultry .-.---.-.....--.-..------.---------------------------------- 22 Horses and Mules ---..-....---..--..------------------------ 23 Types of Farming and Type-of-farming...

Bonnen, C. A.

1960-01-01T23:59:59.000Z

311

Bianchi Type-I Universe with Wet Dark Fluid  

E-Print Network [OSTI]

The Bianchi type-I universe filled with dark energy from a wet dark fluid has been considered. A new equation of state for the dark energy component of the universe has been used. It is modeled on the equation of state $p=\\gamma (\\rho -\\rho_\\star)$ which can describe a liquid, for example water. The exact solutions to the corresponding field equations are obtained in quadrature form. The solution for constant deceleration parameter have been studied in detail for power-law and exponential forms both. The cases $\\gamma =1$ and $\\gamma =0$ have been also analysed.

T. Singh; R. Chaubey

2010-07-08T23:59:59.000Z

312

Bianchi Type-I Universe with Wet Dark Fluid  

E-Print Network [OSTI]

The Bianchi type-I universe filled with dark energy from a wet dark fluid has been considered. A new equation of state for the dark energy component of the universe has been used. It is modeled on the equation of state $p=\\gamma (\\rho -\\rho_\\star)$ which can describe a liquid, for example water. The exact solutions to the corresponding field equations are obtained in quadrature form. The solution for constant deceleration parameter have been studied in detail for power-law and exponential forms both. The cases $\\gamma =1$ and $\\gamma =0$ have been also analysed.

Singh, T

2010-01-01T23:59:59.000Z

313

Using a Family of Dividing Surfaces Normal to the Minimum EnergyPath for Quantum Instanton Rate Constants  

SciTech Connect (OSTI)

One of the outstanding issues in the quantum instanton (QI) theory (or any transition state-type theory) for thermal rate constants of chemical reactions is the choice of an appropriate ''dividing surface'' (DS) that separates reactants and products. (In the general version of the QI theory, there are actually two dividing surfaces involved.) This paper shows one simple and general way for choosing DS's for use in QI Theory, namely using the family of (hyper) planes normal to the minimum energy path (MEP) on the potential energy surface at various distances s along it. Here the reaction coordinate is not one of the dynamical coordinates of the system (which will in general be the Cartesian coordinates of the atoms), but rather simply a parameter which specifies the DS. It is also shown how this idea can be implemented for an N-atom system in 3d space in a way that preserves overall translational and rotational invariance. Numerical application to a simple system (the colliner H + H{sub 2} reaction) is presented to illustrate the procedure.

Li, Yimin; Miller, Wlliam H.

2006-02-22T23:59:59.000Z

314

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

315

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

316

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 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, cm3 molecule-1 s-1, can be expressed in Arrhenius form as k{sub OH+Cyclopentane} = (1.90 {+-} 0.30) x 10{sup -10} exp(-1705 {+-} 156 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.

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

2009-05-01T23:59:59.000Z

317

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

318

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

319

On the ineffectiveness of constant rotation in the primitive equations and their symmetry analysis  

E-Print Network [OSTI]

Modern weather and climate prediction models are based on a system of nonlinear partial differential equations called the primitive equations. Lie symmetries of the primitive equations are computed and the structure of its maximal Lie invariance algebra, which is infinite dimensional, is studied. The maximal Lie invariance algebra for the case of a nonzero constant Coriolis parameter is mapped to the case of vanishing Coriolis force. The same mapping allows one to transform the constantly rotating primitive equations to the equations in a resting reference frame. This mapping is used to obtain exact solutions for the rotating case from exact solutions from the nonrotating equations. Another important result of the paper is the computation of the complete point symmetry group of the primitive equations using the algebraic method.

Cardoso-Bihlo, Elsa Dos Santos

2015-01-01T23:59:59.000Z

320

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

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321

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

322

Low energy constants from the chirally improved Dirac operator D_CI  

E-Print Network [OSTI]

The leading order low energy parameters like the pion decay constant or the quark condensate are well-known from "classical" low energy theorems and experiments. It is a challenge, however, to find these parameters based exclusively on an ab-initio QCD calculation. We discuss results of a quenched lattice calculation of low energy constants using the chirally improved Dirac operator. Several lattice sizes at different lattice spacings are studied, using pseudoscalar and axial vector correlators. We find consistent results for f_\\pi = 96(2) MeV, f_K = 105(2) MeV, \\Sigma = -(286(4) MeV)^3, the average light quark mass m = 4.1(2.4) MeV and m_s = 101(8) MeV.

Christof Gattringer; Philipp Huber; C. B. Lang

2005-09-19T23:59:59.000Z

323

Limiting electron beam current for cyclic induction acceleration in a constant guide field  

SciTech Connect (OSTI)

Theoretical relations are derived for the limiting beam current in a cyclic induction accelerator (CIA) with a constant guide field. The calculations are in agreement with the available experimental data. It is shown that the limiting average beam current in a CIA is of the order of 100 microamperes, i.e., the level attained in microtrons and linear accelerators. The CIA may find industrial applications.

Kanunnikov, V.N.

1982-09-01T23:59:59.000Z

324

Holographic dark energy with varying gravitational constant in Ho?ava-Lifshitz cosmology  

SciTech Connect (OSTI)

We investigate the holographic dark energy scenario with a varying gravitational constant in a flat background in the context of Ho?ava-Lifshitz gravity. We extract the exact differential equation determining the evolution of the dark energy density parameter, which includes G variation term. Also we discuss a cosmological implication of our work by evaluating the dark energy equation of state for low redshifts containing varying G corrections.

Setare, M.R. [Department of Physics, University of Kurdistan, Pasdaran Ave., Sanandaj (Iran, Islamic Republic of); Jamil, Mubasher, E-mail: rezakord@ipm.ir, E-mail: mjamil@camp.nust.edu.pk [Center for Advanced Mathematics and Physics, National University of Sciences and Technology, Rawalpindi, 46000 (Pakistan)

2010-02-01T23:59:59.000Z

325

Determination of the Hubble constant from observations of Cepheid variables in the galaxy M96  

E-Print Network [OSTI]

New Hubble Space Telescope observations of Cepheid variable stars in the nearby galaxy M96 give a distance to the host galaxy group, Leo-I, of 11.6+/-0.8 Mpc. This value, used in conjunction with several reliable secondary indicators of relative distance, constrains the distances to more remote galaxy clusters, and yields a value of the Hubble constant (Ho=69+/-8 km/s/Mpc) that is independent of the velocity of the Leo-I group itself.

N. R. Tanvir; T. Shanks; H. C. Ferguson; D. R. T. Robinson

1995-10-01T23:59:59.000Z

326

ISOPERIMETRIC CONSTANT OF A k-REGULAR GRAPH (A NOTE ON A THEOREM OF  

E-Print Network [OSTI]

ISOPERIMETRIC CONSTANT OF A k-REGULAR GRAPH (A NOTE ON A THEOREM OF BIGGS, MOHAR, AND SHAWE.2 in the paper [BMS] of Biggs, Mohar, and Shawe-Taylor we have instead of (1) and (2): i #21; 4(1 #26;) , #26 that #26; #20; q 1 i 2 k 2 . References BMS. N. Biggs, B. Mohar, J. Shawe-Taylor, The spectral radius of in

Smirnova-Nagnibeda, Tatiana

327

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

328

Tsunami and acoustic-gravity waves in water of constant depth  

SciTech Connect (OSTI)

A study of wave radiation by a rather general bottom displacement, in a compressible ocean of otherwise constant depth, is carried out within the framework of a three-dimensional linear theory. Simple analytic expressions for the flow field, at large distance from the disturbance, are derived. Realistic numerical examples indicate that the Acoustic-Gravity waves, which significantly precede the Tsunami, are expected to leave a measurable signature on bottom-pressure records that should be considered for early detection of Tsunami.

Hendin, Gali; Stiassnie, Michael [Faculty of Civil and Environmental Engineering, Technion – Israel institute of technology, Haifa 32000 (Israel)] [Faculty of Civil and Environmental Engineering, Technion – Israel institute of technology, Haifa 32000 (Israel)

2013-08-15T23:59:59.000Z

329

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

330

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

331

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

332

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

333

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

334

Possible variations of the fine structure constant $?$ and their metrological significance  

E-Print Network [OSTI]

We briefly review the recent experimental results on possible variations of the fine structure constant $\\alpha$ on the cosmological time scale and its position dependence. We outline the theoretical grounds for the assumption that $\\alpha$ might be variable, mention some phenomenological models incorporating a variable $\\alpha$ into the context of modern cosmology and discuss the significance of possible $\\alpha$ variations for theoretical and practical metrology.

K. A. Bronnikov; S. A. Kononogov

2006-09-03T23:59:59.000Z

335

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.

336

Few-group delayed neutron model based on a consistent set of decay constants  

SciTech Connect (OSTI)

During the past 50 yr, more than 200 individual sets of delayed neutron parameters have been measured for 20 different fissionable isotopes. As readily observed from these experimental results, the abundances and the decay constants for each group can vary significantly from isotope to isotope as well as varying as a function of the incident neutron energy. From a reactor dynamic standpoint, variations in the decay constants lead to additional complexity when trying to predict the dynamic behavior of reactor systems that contain two or more fissioning isotopes. For example, the six-group point-reactor model must be expanded to include six differential equations describing the precursors produced by each fissioning isotope. Hence, for a system containing five fissioning isotopes, 30 differential equations would be required to describe the total delayed neutron activity. The objective of this paper is to present a status report of the first phase of an international effort to develop a new set of delayed neutron parameters that are based on a-consistent set of decay constants that simplifies the delayed neutron model in reactor dynamic calculations.

Campbell, J.M.; Spriggs, G.D. [Los Alamos National Lab., NM (United States)

1998-09-01T23:59:59.000Z

337

Evaluating Bounds and Estimators for Constants of Random Polycrystals Composed of Orthotropic Elastic Materials  

SciTech Connect (OSTI)

While the well-known Voigt and Reuss (VR) bounds, and the Voigt-Reuss-Hill (VRH) elastic constant estimators for random polycrystals are all straightforwardly calculated once the elastic constants of anisotropic crystals are known, the Hashin-Shtrikman (HS) bounds and related self-consistent (SC) estimators for the same constants are, by comparison, more difficult to compute. Recent work has shown how to simplify (to some extent) these harder to compute HS bounds and SC estimators. An overview and analysis of a subsampling of these results is presented here with the main point being to show whether or not this extra work (i.e., in calculating both the HS bounds and the SC estimates) does provide added value since, in particular, the VRH estimators often do not fall within the HS bounds, while the SC estimators (for good reasons) have always been found to do so. The quantitative differences between the SC and the VRH estimators in the eight cases considered are often quite small however, being on the order of ±1%. These quantitative results hold true even though these polycrystal Voigt-Reuss-Hill estimators more typically (but not always) fall outside the Hashin-Shtrikman bounds, while the self-consistent estimators always fall inside (or on the boundaries of) these same bounds.

Berryman, J.G.

2012-03-01T23:59:59.000Z

338

Hubble constant from lensing in plasma-redshift cosmology, and intrinsic redshift of quasars  

E-Print Network [OSTI]

In a series of articles, we have shown that the newly discovered plasma-redshift cosmology gives a simpler, more accurate and consistent explanation of many cosmological phenomena than the big-bang cosmology. The SNe Ia observations are in better agreement with the magnitude-redshift relation predicted by the plasma redshift than that predicted by the multi-parameter big-bang cosmology. No deceleration or expansion parameters are needed. The plasma-redshift cosmology is flat and quasi-static on a large scale. The Hubble constant is no longer an expansion parameter, but is instead a measure of the average electron density along the line of sight towards an object. Perusal of the SNe Ia data and quasar data has shown that there is no time dilation. The conventional estimates of the Hubble constant from gravitational lensing observations use the big-bang cosmology for interpreting the observations. This has lead to a large spread and discordant estimates of the Hubble constant. The purpose of the present article is to show that the gravitational lensing observations are in agreement with the plasma-redshift cosmology, and to show how to evaluate the lensing observations based on the new plasma-redshift cosmology. The lensing observations also indicate that the quasars have large intrinsic redshifts.

Ari Brynjolfsson

2004-12-02T23:59:59.000Z

339

Observational constraints on models of the Universe with time variable Gravitational and Cosmological constants along MOG  

E-Print Network [OSTI]

The subject of this paper is to investigate the weak regime covariant scalar-tensor-vector gravity (STVG) theory, known as the MOdified gravity (MOG) theory of gravity. First, we show that the MOG in the absence of scalar fields is converted into $\\Lambda(t),G(t)$ models. Time evolution of the cosmological parameters for a family of viable models have been investigated. Numerical results with the cosmological data have been adjusted. We've introduced a model for dark energy (DE) density and cosmological constant which involves first order derivatives of Hubble parameter. To extend this model, correction terms including the gravitational constant are added. In our scenario, the cosmological constant is a function of time. To complete the model,interaction terms between dark energy and dark matter (DM) manually entered in phenomenological form. Instead of using the dust model for DM, we have proposed DM equivalent to a barotropic fluid. Time evolution of DM is a function of other cosmological parameters. Using sophisticated algorithms, the behavior of various quantities including the densities, Hubble parameter, etc. have been investigated graphically. The statefinder parameters have been used for the classification of DE models. Consistency of the numerical results with experimental data of $SneIa+BAO+CMB$ are studied by numerical analysis with high accuracy.

M. Khurshudyan; N. S. Mazhari; D. Momeni; R. Myrzakulov; M. Raza

2014-06-24T23:59:59.000Z

340

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

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

Microsoft Word - Final stay rate 03.doc  

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

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmospheric Optical Depth7-1D: VegetationEquipment Surfaces andMappingENVIRONMENTALHYDROPOWER MEETING Tulsa16,DOE- ###DRMMYY«Customer11

342

Energy Audit Helps Small Company Stay Competitive  

Broader source: Energy.gov [DOE]

The recommended improvements are saving the West Linn Paper Company in Oregon an annual cost of about $380,000.

343

Effective conductivity, dielectric constant, and diffusion coefficient of digitized composite media via first-passage-time equations  

E-Print Network [OSTI]

Effective conductivity, dielectric constant, and diffusion coefficient of digitized composite media, dielectric constant and diffusion coefficient of digitized composite media. This is accomplished by first then develop the appropriate first-passage-time equations for digitized media: first-passage squares in two

Torquato, Salvatore

344

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

345

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

346

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

347

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.

Götz, 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

348

New approaches for modeling type Ia supernovae  

E-Print Network [OSTI]

runaway in Type Ia supernovae: How to run away? oIgnition in Type Ia Supernovae. II. A Three- dimensionalnumber modeling of type Ia supernovae. I. hydrodynamics.

Zingale, Michael; Almgren, Ann S.; Bell, John B.; Day, Marcus S.; Rendleman, Charles A.; Woosley, Stan

2007-01-01T23:59:59.000Z

349

Goos-Hänchen 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

350

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 7.3×10{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

351

Testing of Dark Energy and a Solution of the Cosmological Constant Problem  

E-Print Network [OSTI]

A probable solution of the cosmological constant problem was recently found. We propose that dark energy of the Universe is vacuum energy. Our Universe during its expansion is spending its vacuum energy for creation of new quantum states, but in the quantum regime phase transitions were more effective in reducing the vacuum energy than creation of new quantum states. Here we show how the 123 crisis orders of the vacuum energy are reduced by conventional physical processes in both the quantum and classical regimes of the Universe evolution. Numeral estimates of dark energy evolution are also presented.

Vladimir Burdyuzha

2014-01-19T23:59:59.000Z

352

Numerical Solutions of the Einstein-Yang-Mills System with Cosmological Constant  

E-Print Network [OSTI]

Numerical evidence for a cosmological version of the Bartnik-McKinnon family of particle-like solutions of the Einstein-Yang-Mills system is presented. Our solutions are also static, but space has the topology of a three-sphere. By adjusting the cosmological constant we found numerically a spherically symmetric solution which can be regarded as an excitation of the unique SO(4)-invariant solution. We expect that for each node number there exists such a solution without a cosmological horizon.

P. Molnar

1995-05-04T23:59:59.000Z

353

Comment on "Constraining a possible dependence of Newton's constant on the Earth's magnetic field"  

E-Print Network [OSTI]

Recently A. Rathke has argued that the KK$\\psi$ model explanation of the discrepant measurements of Newton's constant is already ruled out due to E\\"otv\\"os experiments by several orders of magnitude. The structure of the action of the KK$\\psi$ model is even qualified as inconsistent in the sense that it would yield a negative energy of the electromagnetic field. Here, I refute both claims and emphasize the possibility still open to reconcile the experimental bounds on the test of the weak equivalence principle (WEP) with scalar-tensor theories in general by some compensating mechanism.

J. P. Mbelek

2004-11-26T23:59:59.000Z

354

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

355

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

356

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

357

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

358

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

359

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

360

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

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

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.degree. 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.

Rubin, Michael (Berkeley, CA); Newman, Nathan (Montara, CA); Fu, Tracy (Berkeley, CA); Ross, Jennifer (Pleasanton, CA); Chan, James (Berkeley, CA)

1997-01-01T23:59:59.000Z

362

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

363

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

364

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

2010-12-01T23:59:59.000Z

365

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; Sřren Toxvaerd; Ole J. Heilmann; Thomas B. Schrřder; Jeppe C. Dyre

2011-08-06T23:59:59.000Z

366

Asymptotically (anti)-de Sitter solutions in Gauss-Bonnet gravity without a cosmological constant  

SciTech Connect (OSTI)

In this paper I show that one can have asymptotically de Sitter, anti-de Sitter (AdS), and flat solutions in Gauss-Bonnet gravity without a cosmological constant term in field equations. First, I introduce static solutions whose three surfaces at fixed r and t have constant positive (k=1), negative (k=-1), or zero (k=0) curvature. I show that for k={+-}1 one can have asymptotically de Sitter, AdS, and flat spacetimes, while for the case of k=0, one has only asymptotically AdS solutions. Some of these solutions present naked singularities, while some others are black hole or topological black hole solutions. I also find that the geometrical mass of these five-dimensional spacetimes is m+2{alpha}|k|, which is different from the geometrical mass m of the solutions of Einstein gravity. This feature occurs only for the five-dimensional solutions, and is not repeated for the solutions of Gauss-Bonnet gravity in higher dimensions. Second, I add angular momentum to the static solutions with k=0, and introduce the asymptotically AdS charged rotating solutions of Gauss-Bonnet gravity. Finally, I introduce a class of solutions which yields an asymptotically AdS spacetime with a longitudinal magnetic field, which presents a naked singularity, and generalize it to the case of magnetic rotating solutions with two rotation parameters.

Dehghani, M.H. [Physics Department and Biruni Observatory, Shiraz University, Shiraz 71454, Iran (Iran, Islamic Republic of); Institute for Studies in Theoretical Physics and Mathematics (IPM), P.O. Box 19395-5531, Tehran (Iran, Islamic Republic of); Research Institute for Astrophysics and Astronomy of Maragha, P.O. Box 55134-441, Maragha (Iran, Islamic Republic of)

2004-09-15T23:59:59.000Z

367

Varying Cosmological Constant and the Machian Solution in the Generalized Scalar-Tensor Theory  

E-Print Network [OSTI]

The cosmological constant $(1/2)\\lambda_{1}\\phi_{, \\mu}\\phi ^{, \\mu}/\\phi ^{2}$ is introduced to the generalized scalar-tensor theory of gravitation with the coupling function $\\omega (\\phi)=\\eta /(\\xi -2)$ and the Machian cosmological solution satisfying $\\phi =O(\\rho /\\omega)$ is discussed for the homogeneous and isotropic universe with a perfect fluid (with negative pressure). We require the closed model and the negative coupling function for the attractive gravitational force. The constraint $% \\omega (\\phi)3$. If $\\lambda_{1}<0$ and $0\\leqq -\\eta /\\lambda_{1}<2$, the universe shows the slowly accelerating expansion. The coupling function diverges to $-\\infty $ and the scalar field $\\phi $ converges to $G_{\\infty}^{-1}$ when $\\xi \\to 2$ ($t\\to +\\infty $). The cosmological constant decays in proportion to $t^{-2}$. Thus the Machian cosmological model approaches to the Friedmann universe in general relativity with $\\ddot{a}=0$, $\\lambda =0$, and $p=-\\rho /3$ as $t\\to +\\infty $. General relativity is locally valid enough at present.

A. Miyazaki

2001-03-01T23:59:59.000Z

368

Elastic capsules in shear flow: Analytical solutions for constant and time-dependent shear rates  

E-Print Network [OSTI]

We investigate the dynamics of microcapsules in linear shear flow within a reduced model with two degrees of freedom. In previous work for steady shear flow, the dynamic phases of this model, i.e. swinging, tumbling and intermittent behaviour, have been identified using numerical methods. In this paper, we integrate the equations of motion in the quasi-spherical limit analytically for time-constant and time-dependent shear flow using matched asymptotic expansions. Using this method, we find analytical expressions for the mean tumbling rate in general time-dependent shear flow. The capsule dynamics is studied in more detail when the inverse shear rate is harmonically modulated around a constant mean value for which a dynamic phase diagram is constructed. By a judicious choice of both modulation frequency and phase, tumbling motion can be induced even if the mean shear rate corresponds to the swinging regime. We derive expressions for the amplitude and width of the resonance peaks as a function of the modulation frequency.

Steffen Kessler; Reimar Finken; Udo Seifert

2009-02-26T23:59:59.000Z

369

Measurement of biodegradation rate constants of a water extract from petroleum-contaminated soil  

SciTech Connect (OSTI)

The study of biodegradation rate constants of petroleum products in water extract from contaminated soil presents an important component in the evaluation of bioremediation process. In this study, soil samples were gathered from an industrial site which was used for maintenance and storage of heavy equipment used in the oil and gas exploration and production industry. The petroleum contaminants were extracted from the soil using distilled water. This water extract was used as the substrate to acclimate a microbial community and also for the biological kinetic studies. Kinetic studies were carried out in batch reactors, and the biodegradation rates were monitored by a computer-controlled respirometer. The BOD data were analyzed by using the Monod equation. Experimental results give the average value of the maximum rate constant as 0.038 mg BOD/(mg VSS hr) and the average value of the substrate concentration of half rate as 746 mg BOD/l. A GC/MS analysis on the sample of the test solutions before and after 5 days of biological oxidation indicates that the hydrocarbons initially present in the solution were degraded.

Li, K.Y.; Kane, A.J.; Wang, J.J.; Cawley, W.A. (Lamar Univ., Beaumont, TX (United States). Chemical Engineering Dept.)

1993-01-01T23:59:59.000Z

370

Evaluation of Constant Potential Method in Simulating Electric Double-Layer Capacitors  

E-Print Network [OSTI]

A major challenge in the molecular simulation of electric double layer capacitors (ELDCs) is the choice of an appropriate model for the electrode. Typically, in such simulations the electrode surface is modeled using a uniform fixed charge on each of the electrode atoms, which ignores the electrode response to local charge fluctuations induced by charge fluctuations in the electrolyte. In this work, we evaluate and compare this Fixed Charge Method (FCM) with the more realistic Constant Potential Method (CPM), [Reed, et al., J. Chem. Phys., 126, 084704 (2007)], in which the electrode charges fluctuate in order to maintain constant electric potential in each electrode. For this comparison, we utilize a simplified LiClO$_4$-acetonitrile/graphite EDLC. At low potential difference ($\\Delta\\Psi\\le 2V$), the two methods yield essentially identical results for ion and solvent density profiles; however, significant differences appear at higher $\\Delta\\Psi$. At $\\Delta\\Psi\\ge 4V$, the CPM ion density profiles show sign...

Wang, Zhenxing; Olmsted, David L; Asta, Mark; Laird, Brian B

2014-01-01T23:59:59.000Z

371

Automatic history matching of dual porosity system with wellbore storage and skin constant rate case  

E-Print Network [OSTI]

ACKNOWLEDGEMENTS TABLE OF CONTENTS LIST OF TABLES LIST OF FIGURES INTRODUCTION MATHEMATICAL MODEL HISTORY MATCHING MODEL MODEL VALIDATION Comparison with the Warren and Root Solution RESULTS Type Curves Automatic History Matching Behavior at Early... Page I Comparison of the Numerical Inversion Results with the Warren and Root Analytical Solution. 2 Comparison of the Numerical Inversion Results with the Agarwal et al. Analytical Solution. 3 Basic Type Curve Data 4 Simulated Drawdown Example...

Olarewaju, Joseph Shola

1985-01-01T23:59:59.000Z

372

The Energy of Bianchi Type I and II Universes in Teleparallel Gravity  

E-Print Network [OSTI]

For certain models, the energy of the universe which includes the energy of both the matter and the gravitational fields is obtained by using the quasilocal energy-momentum in teleparallel gravity. It is shown that in the case of the Bianchi type I and II universes, not only the total energy but also the quasilocal energy-momentum for any region vanishes independently of the three dimensionless coupling constants of teleparallel gravity.

Lau Loi So; T. Vargas

2006-11-02T23:59:59.000Z

373

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 d...

Pitman, K M; Corman, A B; Speck, A K

2008-01-01T23:59:59.000Z

374

Time-Variation of the Gravitational Constant and the Machian Solution in the Brans-Dicke Theory  

E-Print Network [OSTI]

The Machian cosmological solution satisfying $\\phi =O(\\rho /\\omega)$ for the perfect-fluid with negative pressure is discussed. When the coefficient of the equation of state $\\gamma \\to -1/3$, the gravitational constant approaches to constant. If we assume the present mass density $\\rho_{0}\\sim \\rho_{c}$ (critical density), the parameter $\\epsilon$ ($\\gamma =(\\epsilon -1)/3$) has a value of order $10^{-3}$ to support the present gravitational constant. The closed model is valid for $\\omega <-3/2\\epsilon$ and exhibits the slow accelerating expansion. We understand why the coupling parameter $| \\omega |$ is so large ($\\omega \\sim -10^{3}$). The time-variation of the gravitational constant $| \\dot{G}/G| \\sim 10^{-13} yr^{-1}$ at present is derived in this model.

A. Miyazaki

2001-03-01T23:59:59.000Z

375

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

376

Single-Duct Constant Air Volume System Supply Air Temperature Reset: Using Return Air Temperature or Outside Air Temperature?  

E-Print Network [OSTI]

The supply air temperature set point for a singleduct constant air volume air handling unit (AHU) system is often reset based on either return air temperature or outside air temperature in order to reduce simultaneous cooling and heating energy...

Wei, G.; Turner, W. D.; Claridge, D.; Liu, M.

2002-01-01T23:59:59.000Z

377

The effect of a constant magnetic field on spontaneous activity of the subesophageal ganglion of the cockroach, Periplaneta americana  

E-Print Network [OSTI]

THE EFFECT OF A CONSTANT MAGNETIC FIELD ON SPONTANEOUS ACTIVITY OF THE SUBESOPHAGEAL GANGLION OF THE COCKROACH, PERIPLANETA AMERICANA A Thesis By DENNIS REGINALD RUSSELL Submitted to the Graduate College of the Texas AIM University... in Partial fulfillment of the requirements for the degree of MASTER OF SCIENCE May, 1965 Major Subject: Physics THE EFFECT OF A CONSTANT MAGNETIC FIELD ON SPONTANEOUS ACTIVITY OF THE SUBESOPHAGEAL GANGLION OF THE COCKROACH, PERIPLANETA AMERICANA A...

Russell, Dennis Reginald

1965-01-01T23:59:59.000Z

378

Thermal rate constant calculation using flux–flux autocorrelation functions: Application to Cl+H2?HCl+H reaction  

E-Print Network [OSTI]

the rotation constants evaluated at some reference geometry ~e.g., the transition state!. The rotational energy of Eq. ~3.12c! then enters the Hamiltonian of Eq. ~3.12a! as a constant, so that kJK JS ~ T !5k0~T !e2Erot JK/kBT, ~3.14a! with E rot JK 51/2 ~ A‡1B...

Wang, Haobin; Thompson, Ward H.; Miller, William H.

1997-08-01T23:59:59.000Z

379

In-pile measurements of the decay constants and relative abundances of delayed neutrons  

SciTech Connect (OSTI)

An in-pile experimental technique to measure the decay constants and the relative abundances of the delayed neutron groups applicable for a given reactor system is presented. The method is based on a least-squares-fitting technique that simultaneously fits a series of transients produced by small reactivity perturbations to a reactor operating initially at delayed critical. The function that is least-squares fit is the analytic solution (written in terms of an arbitrary number of delayed neutron groups) as obtained by the point reactor model for the reactor response following a step change in reactivity. The application of the method does not require any knowledge of the size of the reactivity perturbations, and the method is independent of the detector efficiency. The results are based solely on the measurable quantities of relative power, time, and one measurable root of the Inhour equation.

Spriggs, G.D. (Los Alamos National Lab., NM (United States))

1993-08-01T23:59:59.000Z

380

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

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

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

382

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

383

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

384

Silhouette Area Based Similarity Measure for Template Matching in Constant Time  

E-Print Network [OSTI]

Abstract. In this paper, we present a novel, fast, resolution-independent silhouette area-based matching approach. We approximate the silhouette area by a small set of axis-aligned rectangles. This yields a very memory efficient representation of templates. In addition, utilizing the integral image, we can thus compare a silhouette with an input image at an arbitrary position in constant time. Furthermore, we present a new method to build a template hierarchy optimized for our rectangular representation of template silhouettes. With the template hierarchy, the complexity of our matching method for n templates is O(log n). For example, we can match a hierarchy consisting of 1000 templates in 1.5ms. Overall, our contribution constitutes an important piece in the initialization stage of any tracker of (articulated) objects. Key words: pose estimation, tracking, template matching, rectangle packing problem 1

Daniel Mohr; Gabriel Zachmann

385

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

386

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

387

Primordial black holes as a probe of the early universe and a varying gravitational constant  

E-Print Network [OSTI]

We discuss recent developments in the study of primordial black holes, focussing particularly on their formation and quantum evaporation. Such studies can place important constraints on models of the early Universe. An especially interesting development has been the realization that such constraints may be severely modified if the value of the gravitational "constant" G varies with cosmological epoch, a possibility which arises in many scenarios for the early Universe. The nature of the modification depends upon whether the value of $G$ near a black hole maintains the value it had at its formation epoch (corresponding to gravitational memory) or whether it tracks the background cosmological value. This is still uncertain but we discuss various approaches which might help to resolve the issue.

B. J. Carr

2001-03-20T23:59:59.000Z

388

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

389

Pseudo Euclidean-Signature Harmonic Oscillator, Quantum Field Theory and Vanishing Cosmological Constant  

E-Print Network [OSTI]

The harmonic oscillator in pseudo euclidean space is studied. A straightforward procedure reveals that although such a system may have negative energy, it is stable. In the quantized theory the vacuum state has to be suitably defined and then the zero-point energy corresponding to a positive-signature component is canceled by the one corresponding to a negative-signature component. This principle is then applied to a system of scalar fields. The metric in the space of fields is assumed to have signature (+ + + ... - - -) and it is shown that the vacuum energy, and consequently the cosmological constant, are then exactly zero. The theory also predicts the existence of stable, negative energy field excitations (the so called "exotic matter") which are sources of repulsive gravitational fields, necessary for construction of the time machines and Alcubierre's hyperfast warp drive.

Matej Pavsic

1998-12-15T23:59:59.000Z

390

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

391

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

392

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

393

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

394

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

395

Cardiorespiratory and antinociceptive effects of two different doses of lidocaine administered to horses during a constant intravenous infusion of xylazine and ketamine  

E-Print Network [OSTI]

a constant intravenous infusion of xylazine and ketamine.ani- mals received a constant infusion of 37.5 ?g/kg/min ofof intravenous lidocaine infusion in horses. Am J Vet Res

Nóbrega Neto, Pedro I; Luna, Stelio PL; Queiroz-Williams, Patricia; Mama, Khursheed R; Steffey, Eugene P; Carregaro, Adriano B

2013-01-01T23:59:59.000Z

396

SOL-XX-XXXX, Samborsky,1 Comparison of Tensile Fatigue Resistance and Constant Life  

E-Print Network [OSTI]

for Several Potential Wind Turbine Blade Laminates Daniel D. Samborsky* , Timothy J. Wilson, and John F and potential interest for wind turbine blades, representing three types of fibers: E-glass, WindStrandTM glass are then used to predict the performance under spectrum fatigue loading relative to an earlier material

397

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

398

Country Scotland Type Single malt  

E-Print Network [OSTI]

Country Scotland Type Single malt Distillery Aberfeldy Region Highlands Age 12 years ABV 40% Cask, the perfume characteristics become more spicy, with a bitter hint of Seville oranges in a decidedly dry finish. Drying citrus/oak with a gentle spiciness, held in a warm embrace of cigar smoke, and a little vanilla

Izzard, Rob

399

Country Scotland Type Single malt  

E-Print Network [OSTI]

Country Scotland Type Single malt Distillery Jura Region Island Name Prophecy ABV 46 Cask French airport Notes Limited annual release: 10,000 bottles only. Nose Some peat, aniseed, oily, dry, pungent, dried hay, and anise round things out. Palate Smoky and dry, a muscular, powerful Jura with notes

Izzard, Rob

400

Postdoctoral stay up to 12 months Postdoctoral stay from 13 up to 24 months  

E-Print Network [OSTI]

-region drift measurements o meteor radar winds and temperatures Estimation of mesosphere/lower thermosphere/lower thermosphere dynamics by means of ground-based radio wind and temperature measurements o LF lower ED in Meteorology, physics or Mathemathics Work and dissertation language and language level English or German (one

SchĂĽler, Axel

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

Automatic Utterance Type Detection Using Suprasegmental Features   

E-Print Network [OSTI]

that different types of utterances have different suprasegmental characteristics. The categorisation of these utterance types is based on the theory of conversation games and consists of 12 move types (e.g. reply to a question, wh-question, acknowledgement...

Wright, Helen

402

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

403

An accurate determination of the Hubble constant from Baryon Acoustic Oscillation datasets  

E-Print Network [OSTI]

Even though the Hubble constant cannot be significantly determined by the low-redshift Baryon Acoustic Oscillation (BAO) data alone, it can be tightly constrained once the high-redshift BAO data are combined. Combining BAO data from 6dFGS, BOSS DR11 clustering of galaxies, WiggleZ and $z=2.34$ from BOSS DR11 quasar Lyman-$\\alpha$ forest lines, we get $H_0=68.17^{+1.55}_{-1.56}$ km s$^{-1}$ Mpc$^{-1}$. In addition, adopting the the simultaneous measurements of $H(z)$ and $D_A(z)$ from the two-dimensional two-point correlation function from BOSS DR9 CMASS sample and two-dimensional matter power spectrum from SDSS DR7 sample, we obtain $H_0=68.11\\pm1.69$ km s$^{-1}$ Mpc$^{-1}$. Finally, combining all of the BAO datasets, we conclude $H_0=68.11\\pm 0.86$ km s$^{-1}$ Mpc$^{-1}$, a 1.3% determination.

Cheng Cheng; Qing-Guo Huang

2014-09-22T23:59:59.000Z

404

Direct determination of the local Hamaker constant of inorganic surfaces based on scanning force microscopy  

SciTech Connect (OSTI)

The energetics involved in the bonding fluctuations between nanometer-sized silicon dioxide (SiO{sub 2}) probes and highly oriented pyrolytic graphite (HOPG) and molybdenum disulfide (MoS{sub 2}) could be quantified directly and locally on the submicron scale via a time-temperature superposition analysis of the lateral forces between scanning force microscopy silicon dioxide probes and inorganic sample surfaces. The so-called “intrinsic friction analysis” (IFA) provided direct access to the Hamaker constants for HOPG and MoS{sub 2}, as well as the control sample, calcium fluoride (CaF{sub 2}). The use of scanning probe enables nanoscopic analysis of bonding fluctuations, thereby overcoming challenges associated with larger scale inhomogeneity and surface roughness common to conventional techniques used to determine surface free energies and dielectric properties. A complementary numerical analysis based on optical and electron energy loss spectroscopy and the Lifshitz quantum electrodynamic theory of van der Waals interactions is provided and confirms quantitatively the IFA results.

Krajina, Brad A.; Kocherlakota, Lakshmi S.; Overney, René M., E-mail: roverney@u.washington.edu [Department of Chemical Engineering, University of Washington, Seattle, Washington 98195-1750 (United States)

2014-10-28T23:59:59.000Z

405

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

406

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

407

Constraining supernova equations of state with equilibrium constants from heavy-ion collisions  

E-Print Network [OSTI]

Cluster formation is a fundamental aspect of the equation of state (EOS) of warm and dense nuclear matter such as can be found in supernovae (SN). Similar matter can be studied in heavy-ion collisions (HIC). We use the experimental data of Qin et al. 2012 to test calculations of cluster formation and the role of in-medium modifications of cluster properties in SN EOSs. For the comparison between theory and experiment we use chemical equilibrium constants as the main observables. This reduces some of the systematic uncertainties and allows deviations from ideal gas behavior to be identified clearly. In the analysis, we carefully account for the differences between matter in SN and HIC. We find that, at the lowest densities, the experiment and all theoretical models are consistent with the ideal gas behavior. At higher densities ideal behavior is clearly ruled out and interaction effects have to be considered. The contributions of continuum correlations are of relevance in the virial expansion and remain a difficult problem to solve at higher densities. We conclude that at the densities and temperatures discussed mean-field interactions of nucleons, inclusion of all relevant light clusters, and a suppression mechanism of clusters at high densities have to be incorporated in the SN EOS.

Matthias Hempel; Kris Hagel; Joseph Natowitz; Gerd Röpke; Stefan Typel

2015-03-02T23:59:59.000Z

408

Decay constants of B-mesons from non-perturbative HQET with two light dynamical quarks  

E-Print Network [OSTI]

We present a computation of B-meson decay constants from lattice QCD simulations within the framework of Heavy Quark Effective Theory for the b-quark. The next-to-leading order corrections in the HQET expansion are included non-perturbatively. Based on Nf=2 gauge field ensembles, covering three lattice spacings a (0.08-0.05)fm and pion masses down to 190MeV, a variational method for extracting hadronic matrix elements is used to keep systematic errors under control. In addition we perform a careful autocorrelation analysis in the extrapolation to the continuum and to the physical pion mass limits. Our final results read fB=186(13)MeV, fBs=224(14)MeV and fBs/fB=1.203(65). A comparison with other results in the literature does not reveal a dependence on the number of dynamical quarks, and effects from truncating HQET appear to be negligible.

F. Bernardoni; B. Blossier; J. Bulava; M. Della Morte; P. Fritzsch; N. Garron; A. Gérardin; J. Heitger; G. von Hippel; H. Simma; R. Sommer

2014-04-14T23:59:59.000Z

409

Fractal universe and the speed of light: Revision of the universal constants  

E-Print Network [OSTI]

We apply the property of selfsimilarity that corresponds to the concept of a fractal universe, to the dimension of time. It follows that any interval of time, given by any tick of any clock, is proportional to the age of the universe. The fractality of time gives the fractality of space and mass. First consequence is that the speed of light decreases inversely proportional to time, same as the Hubble parameter. We then revise the universal constants and, at the cosmological scale, they are all of order one, as Dirac proposed. We find three different scales, each one separated by a factor of about 5x10^60: the universe, the Planck scale and what we call the sub Planck scale. Integration of the Einstein cosmological equations, for this fractal universe, gives the solution of a non-expanding universe with the present value of the observed numerical parameters. The red shift measured from the distant galaxies is interpreted here as due to the decreasing speed of light in a fractal universe.

Antonio Alfonso-Faus

2009-05-25T23:59:59.000Z

410

Constraining supernova equations of state with equilibrium constants from heavy-ion collisions  

E-Print Network [OSTI]

Cluster formation is a fundamental aspect of the equation of state (EOS) of warm and dense nuclear matter such as can be found in supernovae (SN). Similar matter can be studied in heavy-ion collisions (HIC). We use the experimental data of Qin et al. 2012 to test calculations of cluster formation and the role of in-medium modifications of cluster properties in SN EOSs. For the comparison between theory and experiment we use chemical equilibrium constants as the main observables. This reduces some of the systematic uncertainties and allows deviations from ideal gas behavior to be identified clearly. In the analysis, we carefully account for the differences between matter in SN and HIC. We find that, at the lowest densities, the experiment and all theoretical models are consistent with the ideal gas behavior. At higher densities ideal behavior is clearly ruled out and interaction effects have to be considered. The contributions of continuum correlations are of relevance in the virial expansion and remain a diff...

Hempel, Matthias; Natowitz, Joseph; Röpke, Gerd; Typel, Stefan

2015-01-01T23:59:59.000Z

411

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

412

Test and evaluation of constant-flow devices for use in SSN AFFF proportioning systems. Interim report, January-May 1986  

SciTech Connect (OSTI)

Constant flow devices, which deliver a constant flow of liquid over a range of upstream and downstream pressures, have been suggested as an alternative to orifice plates for proportioning AFFF in SSN 21 fire-suppression systems. Operational and performance characteristics of two lightweight, inexpensive, commercially available constant-flow devices have significant advantages over orifice plates. Both models tested, however, showed performance degradation when subjected to simulated service conditions. A constant flow device with improved resistance to wear and to AFFF exposure is desirable. Since the constant-flow control devices tested improves proportioning efficiency but do not have optimum characteristics, investigation of improved devices or methods is recommended.

Williams, F.W.; Back, G.G.; Burns, R.E.; Quellette, R.J.; Scheffey, J.L.

1986-11-04T23:59:59.000Z

413

Breathers and localized solitons for the Hirota–Maxwell–Bloch system on constant backgrounds in erbium doped fibers  

SciTech Connect (OSTI)

In nonlinear erbium doped fibers, the Hirota–Maxwell–Bloch system with higher order effects usually governs the propagation of ultrashort pulses. New soliton solutions for this system are constructed on the constant backgrounds including one and two breathers and first and higher order localized soliton solutions. Considering the influence of higher order effects, propagation properties of those soliton solutions are discussed. -- Highlights: •The AB and Ma-breathers are derived on the constant backgrounds. •Dynamic features of two-breathers are discussed. •Localized solutions are generated from two different ways.

Guo, Rui, E-mail: gr81@sina.com; Hao, Hui-Qin

2014-05-15T23:59:59.000Z

414

QCD sum-rule results for heavy-light meson decay constants and comparison with lattice QCD  

E-Print Network [OSTI]

Updated predictions for the decay constants of the D, Ds, B and Bs mesons obtained from Borel QCD sum rules for heavy-light currents are presented and compared with the recent lattice averages performed by the Flavor Lattice Averaging Group. An excellent agreement is obtained in the charm sector, while some tension is observed in the bottom sector. Moreover, available lattice and QCD sum-rule calculations of the decay constants of the vector D*, Ds*, B* and Bs* mesons are compared. Again some tension in the bottom sector is observed.

W. Lucha; D. Melikhov; S. Simula

2014-11-14T23:59:59.000Z

415

QCD sum-rule results for heavy-light meson decay constants and comparison with lattice QCD  

E-Print Network [OSTI]

Updated predictions for the decay constants of the D, Ds, B and Bs mesons obtained from Borel QCD sum rules for heavy-light currents are presented and compared with the recent lattice averages performed by the Flavor Lattice Averaging Group. An excellent agreement is obtained in the charm sector, while some tension is observed in the bottom sector. Moreover, available lattice and QCD sum-rule calculations of the decay constants of the vector D*, Ds*, B* and Bs* mesons are compared. Again some tension in the bottom sector is observed.

Lucha, W; Simula, S

2014-01-01T23:59:59.000Z

416

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

417

Deflagrations in hybrid CONe white dwarfs: a route to explain the faint Type Iax supernova 2008ha  

E-Print Network [OSTI]

Stellar evolution models predict the existence of hybrid white dwarfs (WDs) with a carbon-oxygen core surrounded by an oxygen-neon mantle. Being born with masses ~1.1 Msun, hybrid WDs in a binary system may easily approach the Chandrasekhar mass (MCh) by accretion and give rise to a thermonuclear explosion. Here, we investigate an off-centre deflagration in a near-MCh hybrid WD under the assumption that nuclear burning only occurs in carbon-rich material. Performing hydrodynamics simulations of the explosion and detailed nucleosynthesis post-processing calculations, we find that only 0.014 Msun of material is ejected while the remainder of the mass stays bound. The ejecta consist predominantly of iron-group elements, O, C, Si and S. We also calculate synthetic observables for our model and find reasonable agreement with the faint Type Iax SN 2008ha. This shows for the first time that deflagrations in near-MCh WDs can in principle explain the observed diversity of Type Iax supernovae. Leaving behind a near-MCh...

Kromer, M; Pakmor, R; Ruiter, A J; Hillebrandt, W; Marquardt, K S; Roepke, F K; Seitenzahl, I R; Sim, S A; Taubenberger, S

2015-01-01T23:59:59.000Z

418

A few-group delayed neutron model based on a consistent set of decay constants  

SciTech Connect (OSTI)

As part of an international effort, the Los Alamos National Laboratory has been asked to (1) determine if there is a set of dominant precursors that are common to all fissionable isotopes and all incident neutron energies, (2) expand the existing experimentally-measured few-group models commonly used in the nuclear industry into their 8-group equivalent using a consistent set of decay constants corresponding to these dominant precursors, and (3) formulate new group spectra for the equivalent 8-group model. In response to this request, LANL has calculated the theoretical delayed neutron yield for 14 different isotopes using three different incident neutron spectra (i.e., thermal, fast, and 14.1 MeV) using the current fission-yield and emission probability data found in ENDF-VI. An example of these results is shown in a figure in which the theoretical delayed neutron yields for the 271 precursors produced during thermal fission of {sup 235}U are plotted against the half-lives of the precursors. By comparing the results of all 14 isotopes, a preliminary set of precursors has been identified that are dominant within the various half-life regimes of the delayed neutron precursors. Also plotted on a figure are the group yields of the 8-group equivalent model of Keepin`s 6-group model. And finally, an example of the delayed neutron spectra for group 7 in the 8-group equivalent model is shown. A final report summarizing all results is expected to be released for review by the international steering committee by the summer of 1998.

Campbell, J.M.; Spriggs, G.D.

1998-01-22T23:59:59.000Z

419

Calculations of single crystal elastic constants for yttria partially stabilised zirconia from powder diffraction data  

SciTech Connect (OSTI)

Yttria Stabilised Zirconia (YSZ) is a tough, phase-transforming ceramic that finds use in a wide range of commercial applications from dental prostheses to thermal barrier coatings. Micromechanical modelling of phase transformation can deliver reliable predictions in terms of the influence of temperature and stress. However, models must rely on the accurate knowledge of single crystal elastic stiffness constants. Some techniques for elastic stiffness determination are well-established. The most popular of these involve exploiting frequency shifts and phase velocities of acoustic waves. However, the application of these techniques to YSZ can be problematic due to the micro-twinning observed in larger crystals. Here, we propose an alternative approach based on selective elastic strain sampling (e.g., by diffraction) of grain ensembles sharing certain orientation, and the prediction of the same quantities by polycrystalline modelling, for example, the Reuss or Voigt average. The inverse problem arises consisting of adjusting the single crystal stiffness matrix to match the polycrystal predictions to observations. In the present model-matching study, we sought to determine the single crystal stiffness matrix of tetragonal YSZ using the results of time-of-flight neutron diffraction obtained from an in situ compression experiment and Finite Element modelling of the deformation of polycrystalline tetragonal YSZ. The best match between the model predictions and observations was obtained for the optimized stiffness values of C11?=?451, C33?=?302, C44?=?39, C66?=?82, C12?=?240, and C13?=?50 (units: GPa). Considering the significant amount of scatter in the published literature data, our result appears reasonably consistent.

Lunt, A. J. G., E-mail: alexander.lunt@eng.ox.ac.uk; Xie, M. Y.; Baimpas, N.; Korsunsky, A. M. [Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ (United Kingdom); Zhang, S. Y.; Kabra, S.; Kelleher, J. [ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Harwell, Oxford OX11 0QX (United Kingdom); Neo, T. K. [Specialist Dental Group, Mount Elizabeth Orchard, 3 Mount Elizabeth, #08-03/08-08/08-10, Singapore 228510 (Singapore)

2014-08-07T23:59:59.000Z

420

CMB constraints on mass and coupling constant of light pseudoscalar particles  

E-Print Network [OSTI]

Transformation of CMB photons into light pseudoscalar particles at post big bang nucleosynthesis epoch is considered. Using the present day value of a large scale magnetic field to estimate it at earlier cosmological epochs, the oscillation probability of photons into light pseudoscalar particles with an account of coherence breaking in cosmological plasma is calculated. Demanding that the photon transformation does not lead to an exceedingly large CMB spectral distortion and temperature anisotropy, the constraints on the coupling constant of axion like particles to photons, $ g_{\\phi\\gamma} B \\lesssim (10^{-15} - 10^{-12}) \\textrm{nG}\\times \\textrm{GeV}^{-1}$, are found for the axion like particle mass in the interval $10^{-25}$ eV $\\lesssim m_{\\phi}\\lesssim 10^{-5}$ eV, where $B$ is the strength of the large scale magnetic field at the present time. Our results update the previously obtained ones since we use the density matrix formalism which is more accurate than the wave function approximation for the description of oscillations with an essential coherence breaking. In the axion like particle mass range $10^{-25}$ eV $\\lesssim m_{\\phi}\\lesssim 10^{-14}$ eV, weaker limits, by at least 2 orders of magnitude $g_{\\phi\\gamma} B \\lesssim 10^{-11}\\textrm{nG}\\times \\textrm{GeV}^{-1}$, are obtained in comparison with the wave function approximation. In the mass range $10^{-14}$ eV $\\lesssim m_{\\phi}\\lesssim 10^{-5}$ eV, on the other hand, limits that are stronger, by more than an order of magnitude are obtained. Our results are derived by using upper limits on spectral distortion parameter $\\mu$ and temperature anisotropy $\\Delta T/T$ found by COBE and expected sensitivities by PIXIE/PRISM.

Damian Ejlli; Alexander D. Dolgov

2014-09-15T23:59:59.000Z

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.


421

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

422

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

423

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

GĂĽting, Ralf Hartmut

424

XML Document XML Document Types and Validation  

E-Print Network [OSTI]

XML Document Types and Validation IIM-I340 Objectives XML Document Types and Validation IIM-I340 April, 2010 #12;XML Document Types and Validation IIM-I340 Objectives Learning Objectives Understand: The need for validation Two ways to specify validity: Document Type Definitions (DTDs) XML Schemas #12;XML

Weber, Gregory D.

425

hal00270574, Testing Data Types Implementations from  

E-Print Network [OSTI]

is data type abstraction, testing a concrete implementation raises the issue of the gap betweenhal­00270574, version 1 ­ 6 Apr 2008 Testing Data Types Implementations from Algebraic Speci#12.legall@ibisc.univ-evry.fr Abstract. Algebraic speci#12;cations of data types provide a natural basis for testing data types

Paris-Sud XI, Université de

426

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

427

Algorthmique Types abstraits de donns  

E-Print Network [OSTI]

abstrait de données (TAD) est : 1. un ensemble de données organisé et 2. d'opérations sur ces données. Il appel aux données et aux opérations abstraites du TAD (cou supérieure), 2. suivi d'un choix de représentation du TAD en mémoire (couche inférieure). Types abstraits de donn´ees ­ p.3/90 #12;Décomposition en

Brun, Chez Luc

428

Window Types | Department of Energy  

Energy Savers [EERE]

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion |Energy UsageAUDITVehiclesTankless or Demand-TypeWelcome toFarm Growth Through theofWindow

429

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

430

Derivation of conditions for a Brans-Dicke coupling constant of order unity be consistent with solar system bounds  

E-Print Network [OSTI]

We provide proofs of some assumptions recently made by F. O. Minotti to conclude on the possibility that an additional scalar field minimally coupled to gravity may help to reconcile a Brans-Dicke coupling constant $\\omega$ of the order unity with solar system bounds.

Jean Paul Mbelek

2013-04-30T23:59:59.000Z

431

Achieving Near Zero SSN Power Delivery Networks by Eliminating Power Planes and Using Constant Current Power Transmission Lines  

E-Print Network [OSTI]

of discontinuities such as a power plane split or multiple via holes. Even with a solid return current pathAchieving Near Zero SSN Power Delivery Networks by Eliminating Power Planes and Using Constant Current Power Transmission Lines Suzanne Huh, Daehyun Chung, and Madhavan Swaminathan Interconnect

Swaminathan, Madhavan

432

Constant power cycling for accelerated ageing of supercapacitors Kreczanik Paul, Martin Christian, Venet Pascal, Clerc Guy, Rojat Gerard, Zitouni Younes  

E-Print Network [OSTI]

Constant power cycling for accelerated ageing of supercapacitors Kreczanik Paul, Martin Christian the competitive pole (Lyon Urban Truck and Bus 2015). Keywords «Supercapacitor», «Power cycling», «Lifetime», «Accelerated ageing», «Ageing law» Abstract This paper deals with the lifetime of supercapacitors used

Paris-Sud XI, Université de

433

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

434

Unification of gauge coupling constants in the minimal supersymmtric model with $?_s\\approx0.11$  

E-Print Network [OSTI]

We have studied the gauge unification with the recent electroweak data as a function of the higgsino mass. It was shown that if the strong coupling constant is small $\\approx 0.11$, consistent picture of gauge unification is not possible in the minimal supersymmetric standard model.

A. K. Chaudhuri

1997-11-28T23:59:59.000Z

435

Minimizing Simultaneous Switching Noise at Reduced Power with Constant-Voltage Power Transmission Lines for High-Speed Signaling  

E-Print Network [OSTI]

plane structure with a power transmission line (PTL). In this paper, a new power delivery scheme called Constant Voltage Power Transmission Line (CV-PTL) is shown to significantly reduce switching noise while, and measurements. Keywords Power delivery network, simultaneous switching noise, power transmission line 1

Swaminathan, Madhavan

436

Energy Spectrum of a Relativistic Two-dimensional Hydrogen-like Atom in a Constant Magnetic Field of arbitrary strength  

E-Print Network [OSTI]

We compute, via a variational mixed-base method, the energy spectrum of a two dimensional relativistic atom in the presence of a constant magnetic field of arbitrary strength. The results are compared to those obtained in the non-relativistic and spinless case. We find that the relativistic spectrum does not present $s$ states.

V. M. Villalba; R. Pino

2001-01-23T23:59:59.000Z

437

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

438

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

439

ENVIRONMENTAL POLICY STATEMENT 1 The University of Aberdeen is committed to constant improvement of its environmental performance as  

E-Print Network [OSTI]

ENVIRONMENTAL POLICY STATEMENT 1 The University of Aberdeen is committed to constant improvement will introduce a series of specific policies, aimed at tackling these key environmental issues. Those policies of its environmental performance as part of its wider commitment to sustainability and social

Levi, Ran

440

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

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

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

442

SNe Data Analysis in Variable Speed of Light Cosmologies without Cosmological Constant  

E-Print Network [OSTI]

In this work, we aim to show the possibilities of the variable speed of light (VSL) theory in explaining the type Ia supernovae observations without introducing dark energy. The speed of light is assumed to be scale factor dependent, which is the most popular assumption in VSL theory. We show the modified calculation of the distance modulus, and the validity of the redshift-scale factor relation in VSL theory. Three different models of VSL are tested SNe data-sets with proper constraints on the model parameters. The comparison of the three models and flat $\\Lambda$CDM in distance modulus is showed. Some basic problems and the difficulties of the confirmation of the VSL theory are also discussed

Peng-fei Zhang; Xin-he Meng

2014-04-30T23:59:59.000Z

443

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

444

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

445

Motion in Bimetric Type Theories of Gravity  

E-Print Network [OSTI]

The problem of motion for different test particles, charged and spinning objects of constant spinning tensor in different versions of bimetric theory of gravity is obtained by deriving their corresponding path and path deviation equations, using a modified Bazanski in presence of Riemannian geometry. This method enables us to find path and path deviation equations of different objects orbiting very strong gravitational fields.

Kahil, M E

2015-01-01T23:59:59.000Z

446

Ideal bandpasses for type Ia supernova cosmology  

E-Print Network [OSTI]

diversity of type Ia Supernovae, in preparation. Kim, A.error in measurements of supernovae depends on a periodicABSTRACT To use type Ia supernovae as standard candles for

Davis, Tamara M.; Schmidt, Brian P.; Kim, Alex G.

2005-01-01T23:59:59.000Z

447

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

448

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...

449

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...

450

The $D_s$, $D^+$, $B_s$ and $B$ decay constants from $2+1$ flavor lattice QCD  

E-Print Network [OSTI]

We present a study of the $D$ and $B$ leptonic decay constants on the MILC $N_f=2+1$ asqtad gauge ensembles using asqtad-improved staggered light quarks and clover heavy quarks in the Fermilab interpretation. Our previous analysis \\cite{Bazavov:2011aa} computed the decay constants at lattice spacings $a \\approx 0.14, 0.11$ and $0.083$ fm. We have extended the simulations to finer $a \\approx 0.058$ and $0.043$ fm lattice spacings, and have also increased statistics; this allows us to address many important sources of uncertainty. Technical advances include a two-step two-point fit procedure, better tuning of the heavy quark masses and a better determination of the axial-vector current matching. The present analysis remains blinded, so here we focus on the improvements and their predicted impact on the error budget compared to the prior analysis.

A. Bazavov; C. Bernard; C. Bouchard; C. DeTar; D. Du; A. X. El-Khadra; J. Foley; E. D. Freeland; E. Gámiz; Steven Gottlieb; U. M. Heller; J. Kim; J. Komijani; A. S. Kronfeld; J. Laiho; L. Levkova; P. B. Mackenzie; D. Mohler; E. T. Neil; M. B. Oktay; S. Qiu; J. N. Simone; R. L. Sugar; D. Toussaint; R. S. Van de Water; R. Zhou

2014-03-27T23:59:59.000Z

451

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

452

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

453

The Hubble Constant from Observations of the Brightest Red Giant Stars in a Virgo-Cluster Galaxy  

E-Print Network [OSTI]

The Virgo and Fornax clusters of galaxies play central roles in determining the Hubble constant H_0. A powerful and direct way of establishing distances for elliptical galaxies is to use the luminosities of the brightest red-giant stars (the TRGB luminosity, at M_I = -4.2). Here we report the direct observation of the TRGB stars in a dwarf elliptical galaxy in the Virgo cluster. We find its distance to be 15.7 +- 1.5 Megaparsecs, from which we estimate a Hubble constant of H_0 = 77 +- 8 km/s/Mpc. Under the assumption of a low-density Universe with the simplest cosmology, the age of the Universe is no more than 12-13 billion years.

W. E. Harris; P. R. Durrell; M. J. Pierce; J. Secker

1998-06-10T23:59:59.000Z

454

Rates and progenitors of type Ia supernovae  

E-Print Network [OSTI]

Supernovae . . . . . . . . . . . . . . . . . . . .Supernovae Found 5.1 Introduction . . . . . . . . . . . .1.2 Non-Type Ia Supernovae . . . . . . . . . . . . . . . 1.3

Wood-Vasey, William Michael

2004-01-01T23:59:59.000Z

455

Overload permit rules applicable to H-type and HS-type bridges  

E-Print Network [OSTI]

This document defines standards for issuing permits for overweight vehicles crossing standard H-type and HS-type Texas highway bridges. A general formula and a bridge specific formula have been developed for simple spans of both bridge types...

Litchfield, Stephen Charles

1994-01-01T23:59:59.000Z

456

Relativistic derivations of the electric and magnetic fields generated by an electric point charge moving with constant velocity  

E-Print Network [OSTI]

We propose a simple relativistic derivation of the electric and the magnetic fields generated by an electric point charge moving with constant velocity. Our approach is based on the radar detection of the point space coordinates where the fields are measured. The same equations were previously derived in a relatively complicated way2 based exclusively on general electromagnetic field equations and without making use of retarded potentials or relativistic equations

Bernhard Rothenstein; Stefan Popescu; George J. Spix

2006-01-05T23:59:59.000Z

457

Superharmonic nonlinear lateral vibrations of a segmented driveline incorporating a tuned damper excited by non-constant velocity joints  

E-Print Network [OSTI]

SUPERHARMONIC NONLINEAR LATERAL VIBRATIONS OF A SEGMENTED DRIVELINE INCORPORATING A TUNED DAMPER EXCITED BY NON-CONSTANT VELOCITY JOINTS A Dissertation by MICHAEL SCOTT BROWNE Submitted to the Office of Graduate Studies... of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY May 2009 Major Subject: Mechanical Engineering SUPERHARMONIC NONLINEAR LATERAL VIBRATIONS OF A SEGMENTED DRIVELINE INCORPORATING A...

Browne, Michael

2010-07-14T23:59:59.000Z

458

A beta-type fully implicit reservoir simulator with variable bubble point and dew point  

E-Print Network [OSTI]

the following equation. V P 5. 617 m g 2 QT 1000 (56) And the R curve can be obtained from the same constant volume Sg depletion by summing up the GPM content of the propane through hep- tanes plus fractions. The B and the R can then be calculated 0 so...A BETA-TYPE FULLY IMPLICIT RESERVOIR SIMULATOR WITH VARIABLE BUBBLE POINT AND DEW POINT A Thesis by JARLE BOE Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER...

Boe, Jarle

1980-01-01T23:59:59.000Z

459

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 Girăo

2014-06-06T23:59:59.000Z

460

Effect of sorghum type on the digestibility of segmented and whole plant sorghum silages  

E-Print Network [OSTI]

'les. Gratitude is expressed to Miss Debbie McGill for the typing of this thes1s . TABLE OF CONTENTS I NT RO DU CTI ON REVIEN OF LITERATURE EXPERIMENTAL PROCEDURE In Vitro Study. Harvesting. In Vivo Digestion Trial RESULTS. In Vitro Study. In Vivo... . Nebster and Davi es (26) reported protein percentages to be exceedingly high at the early stages of growth and to decrease rapidly as the grain developed and thereafter remained relatively constant. Marshall, et al. (13) found an average daily...

Spiegel Richa, Rodrigo Enrique

1975-01-01T23:59:59.000Z

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.


461

Fuzzy Typing for Document Management Alison HUETTNER  

E-Print Network [OSTI]

Fuzzy Typing for Document Management Alison HUETTNER Clairvoyance Corporation 5301 Fifth Avenue method of document analysis and management, based on a combination of techniques from NLP and fuzzy logic typing for document management. The fuzzy typing approach is general in scope and can be applied to many

Wu, Dekai

462

Aspectual Session Types Nicolas Tabareau Mario Sdholt  

E-Print Network [OSTI]

Aspectual Session Types Nicolas Tabareau Mario SĂĽdholt 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

463

Type Ia Supernova Carbon Footprints  

E-Print Network [OSTI]

We present convincing evidence of unburned carbon at photospheric velocities in new observations of 5 Type Ia supernovae (SNe Ia) obtained by the Nearby Supernova Factory. These SNe are identified by examining 346 spectra from 124 SNe obtained before +2.5 d relative to maximum. Detections are based on the presence of relatively strong C II 6580 absorption "notches" in multiple spectra of each SN, aided by automated fitting with the SYNAPPS code. Four of the 5 SNe in question are otherwise spectroscopically unremarkable, with ions and ejection velocities typical of SNe Ia, but spectra of the fifth exhibits high-velocity (v > 20,000 km/s) Si II and Ca II features. On the other hand, the light curve properties are preferentially grouped, strongly suggesting a connection between carbon-positivity and broad band light curve/color behavior: Three of the 5 have relatively narrow light curves but also blue colors, and a fourth may be a dust-reddened member of this family. Accounting for signal-to-noise and phase, we ...

Thomas, R C; Aragon, C; Antilogus, P; Bailey, S; Baltay, C; Bongard, S; Buton, C; Canto, A; Childress, M; Chotard, N; Copin, Y; Fakhouri, H K; Gangler, E; Hsiao, E Y; Kerschhaggl, M; Kowalski, M; Loken, S; Nugent, P; Paech, K; Pain, R; Pecontal, E; Pereira, R; Perlmutter, S; Rabinowitz, D; Rigault, M; Rubin, D; Runge, K; Scalzo, R; Smadja, G; Tao, C; Weaver, B A; Wu, C; Brown, P J; Milne, P A

2011-01-01T23:59:59.000Z

464

String or branelike solutions in four-dimensional Einstein gravity in the presence of a cosmological constant  

SciTech Connect (OSTI)

We investigate string or branelike solutions for four-dimensional vacuum Einstein equations in the presence of a cosmological constant. For the case of negative cosmological constant, the Banados-Teitelboim-Zanelli black string is the only warped stringlike solution. The general solutions for nonwarped branelike configurations are found and they are characterized by the Arnowitt-Deser-Misner mass density and two tensions. Interestingly, the sum of these tensions is equal to the minus of the mass density. Other than the well-known black string and soliton spacetimes, all the static solutions possess naked singularities. The time-dependent solutions can be regarded as the anti-de Sitter extension of the well-known Kasner solutions. The speciality of those static regular solutions and the implication of singular solutions are also discussed in the context of cylindrical matter collapse. For the case of positive cosmological constant, the Kasner-de Sitter spacetime appears as time-dependent solutions and all static solutions are found to be naked singular.

Lee, Youngone [Department of Physics and Institute of Basic Sciences, Daejin University, Pocheon, Gyeonggi 487-711 (Korea, Republic of); Research Institute for Natural Sciences, Hanyang University, Seoul 133-791 (Korea, Republic of); Kang, Gungwon [Korea Institute of Science and Technology Information (KISTI), 334 Gwahak-ro, Yuseong-gu, Daejeon 305-806 (Korea, Republic of); Kim, Hyeong-Chan [School of Liberal Arts and Sciences, Chungju National University, Chungju 380-702 (Korea, Republic of); Lee, Jungjai [Department of Physics and Institute of Basic Sciences, Daejin University, Pocheon, Gyeonggi 487-711 (Korea, Republic of)

2011-10-15T23:59:59.000Z

465

Tuning of colossal dielectric constant in gold-polypyrrole composite nanotubes using in-situ x-ray diffraction techniques  

SciTech Connect (OSTI)

In-situ x-ray diffraction technique has been used to study the growth process of gold incorporated polypyrrole nanotubes that exhibit colossal dielectric constant due to existence of quasi-one-dimensional charge density wave state. These composite nanotubes were formed within nanopores of a polycarbonate membrane by flowing pyrrole monomer from one side and mixture of ferric chloride and chloroauric acid from other side in a sample cell that allows collection of x-ray data during the reaction. The size of the gold nanoparticle embedded in the walls of the nanotubes was found to be dependent on chloroauric acid concentration for nanowires having diameter more than 100 nm. For lower diameter nanotubes the nanoparticle size become independent of chloroauric acid concentration and depends on the diameter of nanotubes only. The result of this study also shows that for 50 nm gold-polypyrrole composite nanotubes obtained with 5.3 mM chloroauric acid gives colossal dielectric constant of about 10{sup 7}. This value remain almost constant over a frequency range from 1Hz to 10{sup 6} Hz even at 80 K temperature.

Sarma, Abhisakh; Sanyal, Milan K., E-mail: milank.sanyal@saha.ac.in [Saha Institute of Nuclear Physics, 1/AF Bidhannagar, Kolkata 700 064 (India)

2014-09-15T23:59:59.000Z

466

Transport Phenomena and Light Element Abundances in the Sun and Solar Type Stars  

E-Print Network [OSTI]

The observations of light elements in the Sun and Solar type stars give special clues for understanding the hydrodynamical processes at work in stellar interiors. In the Sun 7Li is depleted by 140 while 3He has not increased by more than 10% in 3 Gyrs. Meanwhile the inversion of helioseismic modes lead to a precision on the sound velocity of about .1%. The mixing processes below the solar convection zone are constrained by these observations. Lithium is depleted in most Pop I solar type stars. In halo stars however, the lithium abundance seems constant in the "spite plateau" with no observed dispersion, which is difficult to reconcile with the theory of diffusion processes. In the present paper, the various relevant observations will be discussed. It will be shown that the mu-gradients induced by element settling may help solving the "lithium paradox".

Sylvie Vauclair

2000-02-17T23:59:59.000Z

467

Metabolic Rate Constants for Hydroquinone in F344 Rat and Human Liver Isolated Hepatocytes: Application to a PBPK model.  

SciTech Connect (OSTI)

Hydroquinone (HQ) is an important industrial chemical that also occurs naturally in foods and in the leaves and bark of a number of plant species. Exposure of laboratory animals to HQ may result in a species-, sex-, and strain-specific nephrotoxicity. The sensitivity of male F344 vs. female F344 and Sprague-Dawley rats or B6C3F1 mice appears to be related to differences in the rates of formation and further metabolism of key nephrotoxic metabolites. Metabolic rate constants for the conversion of HQ through several metabolic steps to the mono-glutathione conjugate and subsequent detoxification via mercapturic acid were measured in suspension cultures of hepatocytes isolated from male F344 rats and humans. An in vitro mathematic kinetic model was used to analyze each metabolic step by simultaneously fitting the disappearance of each substrate and the appearance of subsequent metabolites. An iterative, nested approach was used whereby downstream metabolites were considered first and the model was constrained by the requirement that rate constants determined during analysis of individual metabolic steps must also satisfy the complete, integrated metabolism scheme, including competitive pathways. The results from this study indicated that the overall capacity for metabolism of HQ and its mono-glutathione conjugate is greater in hepatocytes from humans than those isolated from rats, suggesting a greater capacity for detoxification of the glutathione conjugates. Metabolic rate constants were applied to an existing physiologically based pharmacokinetic model and the model was used to predict total glutathione metabolites produced in the liver. The results showed that body burdens of these metabolites will be much higher in rats than humans.

Poet, Torka S.; Wu, Hong; English, J C.; Corley, Rick A.

2004-11-15T23:59:59.000Z

468

Comparison of entropy production rates in two different types of self-organized flows: Benard convection and zonal flow  

SciTech Connect (OSTI)

Two different types of self-organizing and sustaining ordered motion in fluids or plasmas--one is a Benard convection (or streamer) and the other is a zonal flow--have been compared by introducing a thermodynamic phenomenological model and evaluating the corresponding entropy production rates (EP). These two systems have different topologies in their equivalent circuits: the Benard convection is modeled by parallel connection of linear and nonlinear conductances, while the zonal flow is modeled by series connection. The ''power supply'' that drives the systems is also a determinant of operating modes. When the energy flux is a control parameter (as in usual plasma experiments), the driver is modeled by a constant-current power supply, and when the temperature difference between two separate boundaries is controlled (as in usual computational studies), the driver is modeled by a constant-voltage power supply. The parallel (series)-connection system tends to minimize (maximize) the total EP when a constant-current power supply drives the system. This minimum/maximum relation flips when a constant-voltage power supply is connected.

Kawazura, Y.; Yoshida, Z. [Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Chiba 277-8561 (Japan)

2012-01-15T23:59:59.000Z

469

Non-Perturbative Gluon pair production from a Constant Chromo-Electric Field via the Schwinger Mechanism in Arbitrary Gauge  

E-Print Network [OSTI]

We study the non-perturbative production of gluon pairs from a constant SU(3) chromo-electric background field via the Schwinger mechanism. We fix the covariant background gauge with an arbitrary gauge parameter \\alpha. We determine the transverse momentum distribution of the gluons, as well as the total probability of creating pairs per unit space time volume. We find that the result is independent of the covariant gauge parameter \\alpha used to define arbitrary covariant background gauges. We find that our non-perturbative result is both gauge invariant and gauge parameter \\alpha independent.

Fred Cooper; Gouranga C. Nayak

2006-02-21T23:59:59.000Z

470

Soft-Gluon Production Due to a Gluon Loop in a Constant Chromo-Electric Background Field  

E-Print Network [OSTI]

We obtain an exact result for the soft gluon production and its p_T distribution due to a gluon loop in a constant chromo-electric background field E^a with arbitrary color. Unlike Schwinger's result for e^+e^- pair production in QED which depends only on one gauge invariant quantity, the Electric field E, we find that the p_T distribution of the gluons depend on two gauge invariant quantities, E^aE^a and [d_{abc}E^aE^bE^c]^2.

Gouranga C. Nayak; Peter van Nieuwenhuizen

2005-05-24T23:59:59.000Z

471

Non-Perturbative Quark-Antiquark Production From a Constant Chromo-Electric Field via the Schwinger Mechanism  

E-Print Network [OSTI]

We obtain an exact result for the non-perturbative quark (antiquark) production rate and its p_T distribution from a constant SU(3) chromo-electric field E^a with arbitary color index $a$ by directly evaluating the path integral. Unlike the WKB tunneling result, which depends only on one gauge invariant quantity |E|, the strength of the chromo-electric field, we find that the exact result for the p_T distribution for quark (antiquark) production rate depends on two independent Casimir (gauge) invariants, E^aE^a and [d_{abc}E^aE^bE^c]^2.

Gouranga C. Nayak

2005-12-07T23:59:59.000Z

472

Brane world solutions of perfect fluid in the background of a bulk containing dust or cosmological constant  

E-Print Network [OSTI]

The paper presents some solutions to the five dimensional Einstein equations due to a perfect fluid on the brane with pure dust filling the entire bulk in one case and a cosmological constant (or vacuum) in the bulk for the second case. In the first case, there is a linear relationship between isotropic pressure, energy density and the brane tension, while in the second case, the perfect fluid is assumed to be in the form of chaplygin gas. Cosmological solutions are found both for brane and bulk scenarios and some interesting features are obtained for the chaplygin gas on the brane which are distinctly different from the standard cosmology in four dimensions.

Tanwi Bandyopadhyay; Subenoy Chakraborty; Asit Banerjee

2006-09-18T23:59:59.000Z

473

Influence of the cosmological constant on the motion of Magellanic Clouds in the gravitational field of Milky Way  

SciTech Connect (OSTI)

Using the pseudo-Newtonian (PN) potential reflecting properties of the Schwarz-schild-de Sitter spacetime, we estimate the influence of the repulsive cosmological constant ? ? 1.3 × 10{sup ?56}cm{sup ?2} implied by recent cosmological tests onto the motion of both Small and Large Magellanic Clouds (SMC and LMC) in the gravitational field of the Milky Way. Considering detailed modelling of the gravitational field of the Galaxy disc, bulge and cold dark matter halo, the trajectories of SMC and LMC constructed for the PN potential with the cosmological constant are confronted to those given for ? = 0. In the realistic model of the extended cold dark matter halo its edge and related total mass are taken at typical values reflecting recent diversity in the total Galaxy mass estimates. In all cases, strong influence of the cosmological constant, on 10% level or higher, has been found for motion of both SMC and LMC. Inside the halo, the Newtonian part of the PN potential is exact enough, while outside the halo the PN potential can give relevant relativistic corrections. The role of the cosmological constant is most conspicuous when binding mass is estimated for the satellite galaxies. We have found a strong influence of cosmic repulsion on the total binding mass for both galaxies. For SMC there is the binding mass M{sub SMC}{sup ?=0} = 7.07 × 10{sup 11}M{sub ?} and M{sub SMC}{sup ?>0} = 8.61 × 10{sup 11}M{sub ?}, while even much higher increase is found for LMC, where M{sub LMC}{sup ?=0} = 1.50 × 10{sup 12}M{sub ?} and M{sub LMC}{sup ?} {sup >0} = 2.21 × 10{sup 12}M{sub ?}, putting serious doubts on the possibility that the LMC is bounded by the Milky Way. However, the estimates of binding masses are strongly influenced by initial velocity of SMC and LMC; we took the values inferred for the IAU MW rotation velocity ? 220 km/s. Our results indicate very important role of the cosmic repulsion in the motion of interacting galaxies, clearly demonstrated in the case of the satellite SMC and LMC galaxies moving in the field of Milky Way. In some cases, the effect of the cosmic repulsion can be even comparable to the effects of the dynamical friction and the Andromeda Galaxy.

Stuchlík, Zden?k; Schee, Jan, E-mail: zdenek.stuchlik@fpf.slu.cz, E-mail: jan.schee@fpf.slu.cz [Institute of Physics, Faculty of Philosophy and Science, Silesian University in Opava, Bezrucovo nám. 13, Opava (Czech Republic)

2011-09-01T23:59:59.000Z

474

Apparatus for adjusting and maintaining the humidity of gas at a constant value within a closed system  

DOE Patents [OSTI]

The humidity of a gas within a closed system is maintained at constant level by providing a saturated salt solution within a lower chamber in communication with an upper chamber conjointly defined by upper and lower container sections in sealing contact with each other to establish a closed container. A partition wall separates the salt solution from the test region in the upper chamber. A tube extending through the partition plate allows humidified gas to pass from the lower to the upper chamber. A glass wool plug or membranous material within the tube prevents migration of salt into the test region.

Abernathy, B.R.; Walters, R.R.

1985-08-05T23:59:59.000Z

475

Type Inferencing and MATLAB to Modelica Translation.  

E-Print Network [OSTI]

?? Matlab is a proprietary, interactive, dynamically-typed language for technical computing. It is widely used for prototyping algorithms and applications of scientific computations. Since it… (more)

Mohammad, Jahanzeb

2014-01-01T23:59:59.000Z

476

Type B Accident Investigation, Subcontractor Employee Personal...  

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

ignited the right leg of his 100% cotton anticontamination (anti-c) coveralls and the plastic bootie. Type B Accident Investigation, Subcontractor Employee Personal Protective...

477

Playing games with EPR-type experiments  

E-Print Network [OSTI]

An approach towards quantum games is proposed that uses the unusual probabilities involved in EPR-type experiments directly in two-player games.

Azhar Iqbal

2005-07-17T23:59:59.000Z

478

Turbulent Combustion in Type Ia Supernova Models  

E-Print Network [OSTI]

We review the astrophysical modeling of type Ia supernova explosions and describe numerical methods to implement numerical simulations of these events. Some results of such simulations are discussed.

F. K. Roepke; W. Hillebrandt

2006-09-15T23:59:59.000Z

479

Convolution type operators on locally compact groups  

E-Print Network [OSTI]

Shtein--~erg, Convolution Type Operators on Locally Compact Groups [in Russian],. Manuscript Deposited in the All-Union Institute of Scientific and Technical ...

480

Natural Nuclear Reactor Oklo and Variation of Fundamental Constants Part 1: Computation of Neutronics of Fresh Core  

E-Print Network [OSTI]

Using modern methods of reactor physics we have performed full-scale calculations of the natural reactor Oklo. For reliability we have used recent version of two Monte Carlo codes: Russian code MCU REA and world wide known code MCNP (USA). Both codes produce similar results. We have constructed a computer model of the reactor Oklo zone RZ2 which takes into account all details of design and composition. The calculations were performed for three fresh cores with different uranium contents. Multiplication factors, reactivities and neutron fluxes were calculated. We have estimated also the temperature and void effects for the fresh core. As would be expected, we have found for the fresh core a significant difference between reactor and Maxwell spectra, which was used before for averaging cross sections in the Oklo reactor. The averaged cross section of Sm-149 and its dependence on the shift of resonance position (due to variation of fundamental constants) are significantly different from previous results. Contrary to results of some previous papers we find no evidence for the change of the fine structure constant in the past and obtain new, most accurate limits on its variation with time: -4 10^{-17}year^{-1} < d alpha/dt/alpha < 3 10^{-17} year^{-1} A further improvement in the accuracy of the limits can be achieved by taking account of the core burnup. These calculations are in progress.

Yu. V. Petrov; A. I. Nazarov; M. S. Onegin; V. Yu. Petrov; E. G. Sakhnovsky

2005-09-15T23:59:59.000Z

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481

A manifold of possible physics-laws in a universe where the planck constant and speed of light parameters vary  

E-Print Network [OSTI]

I assume a universe whereby the speed of light and the planck constant are not constants but instead parameters that vary locally in time-and space. When describing motion, I am able to derive a modified path integral description at the quantum level, which offers a natural extension of quantum mechanics. At the microscopic level, this path integral intuitively describes a physics with many quantum realities thus leading to a novel concept of manifold of physics, which can be looked at as a novel action principle. This paradigm reflects the notion that the observed laws of physics on any given scale are determined by the underlying distribution of the fundamental parameters (i.e Quantum Mechanics is just one point on this manifold), thus leading to many possible physical-law based behaviors. By choosing a Gaussian distribution of the parameters, a quadratic action term appears in the path-integral, which in turns leads to a complex classical action (and by continuation a new description for inertia) at the classical level. In the accompanying manuscript the classical doublet equation of motion is applied to the Newtonian gravitation field, and a MOND-like, dark-energy-like, and pioneer-anomaly-like solutions are derived.

Roee Amit

2008-02-14T23:59:59.000Z

482

A reverse Monte Carlo method for deriving optical constants of solids from reflection electron energy-loss spectroscopy spectra  

SciTech Connect (OSTI)

A reverse Monte Carlo (RMC) method is developed to obtain the energy loss function (ELF) and optical constants from a measured reflection electron energy-loss spectroscopy (REELS) spectrum by an iterative Monte Carlo (MC) simulation procedure. The method combines the simulated annealing method, i.e., a Markov chain Monte Carlo (MCMC) sampling of oscillator parameters, surface and bulk excitation weighting factors, and band gap energy, with a conventional MC simulation of electron interaction with solids, which acts as a single step of MCMC sampling in this RMC method. To examine the reliability of this method, we have verified that the output data of the dielectric function are essentially independent of the initial values of the trial parameters, which is a basic property of a MCMC method. The optical constants derived for SiO{sub 2} in the energy loss range of 8-90 eV are in good agreement with other available data, and relevant bulk ELFs are checked by oscillator strength-sum and perfect-screening-sum rules. Our results show that the dielectric function can be obtained by the RMC method even with a wide range of initial trial parameters. The RMC method is thus a general and effective method for determining the optical properties of solids from REELS measurements.

Da, B.; Sun, Y.; Ding, Z. J. [Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, People's Republic of China (China)] [Hefei National Laboratory for Physical Sciences at Microscale and Department of Physics, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, People's Republic of China (China); Mao, S. F. [School of Nuclear Science and Technology, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, People's Republic of China (China)] [School of Nuclear Science and Technology, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, People's Republic of China (China); Zhang, Z. M. [Centre of Physical Experiments, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, People's Republic of China (China)] [Centre of Physical Experiments, University of Science and Technology of China, 96 Jinzhai Road, Hefei, Anhui 230026, People's Republic of China (China); Jin, H.; Yoshikawa, H.; Tanuma, S. [Advanced Surface Chemical Analysis Group, National Institute for Materials Science, 1-2-1 Sengen Tsukuba, Ibaraki 305-0047 (Japan)] [Advanced Surface Chemical Analysis Group, National Institute for Materials Science, 1-2-1 Sengen Tsukuba, Ibaraki 305-0047 (Japan)

2013-06-07T23:59:59.000Z

483

Archived Reference Building Type: Medium office  

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.

484

Archived Reference Building Type: Medium office  

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 zones is available for reference. Current versions are also available.

485

WASTE DESCRIPTION TYPE OF PROJECT POUNDS REDUCED,  

E-Print Network [OSTI]

Fuel oil and Turkey Based Biofuel Energy Rocovery 12,000 Industrial Waste $30,000 $500 $29,500 1500WASTE DESCRIPTION TYPE OF PROJECT POUNDS REDUCED, REUSED, RECYCLED OR CONSERVED IN 2006 WASTE TYPE DESCRIPTION DETAILS * Aerosol Can Disposal System Recycling 528 66 pounds of hazardous waste per unit $7

486

Archived Reference Building Type: Secondary school  

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.

487

Project Name Project Number Tagging Type  

E-Print Network [OSTI]

Project Name Project Number Primary Tagging Type Secondary Tagging Type Fish Species Tagging/ Secondary Legal Driver (BiOp, MOA, Accord, etc.) Tagging Purpose Funded Entity Tagging Location Retrieval CWT Recovery Project 2010-036-00 CWT PIT Chinook, coho retrieval, analysis, address PSMFC sampling

488

Archived Reference Building Type: Secondary school  

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 zones is available for reference. Current versions are also available.

489

Repairing Type Errors in Functional Programs   

E-Print Network [OSTI]

Type systems for programming languages can be used by compilers to reject programs which are found to be unsound and which may, therefore, fail to execute successfully. When a program is rejected the programmer must repair it so that it can be type...

McAdam, Bruce J

490

Archived Reference Building Type: Outpatient health care  

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.

491

Archived Reference Building Type: Outpatient health care  

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 zones is available for reference. Current versions are also available.

492

Serum markers for type II diabetes mellitus  

DOE Patents [OSTI]

A method for identifying persons with increased risk of developing type 2 diabetes mellitus utilizing selected biomarkers described hereafter either alone or in combination. The present invention allows for broad based, reliable, screening of large population bases and provides other advantages, including the formulation of effective strategies for characterizing, archiving, and contrasting data from multiple sample types under varying conditions.

Metz, Thomas O; Qian, Wei-Jun; Jacobs, Jon M; Polpitiya, Ashoka D; Camp, II, David G; Smith, Richard D

2014-03-18T23:59:59.000Z

493

Testing Type Class Laws Johan Jeuring  

E-Print Network [OSTI]

]. Instances of Monad should satisfy the following laws: return a>>=k k a m >>=return m m >>=(x k x>>=h) (m>>=k)>>=hTesting Type Class Laws Johan Jeuring Patrik Jansson Cl´audio Amaral Technical Report UU-CS-2012.089 3508 TB Utrecht The Netherlands #12;Testing Type Class Laws Johan Jeuring Utrecht University and Open

Utrecht, Universiteit

494

WASTE DESCRIPTION TYPE OF PROJECT POUNDS REDUCED,  

E-Print Network [OSTI]

WASTE DESCRIPTION TYPE OF PROJECT POUNDS REDUCED, REUSED, RECYCLED OR CONSERVED IN 2004 WASTE TYPE Brake Cleaner Recycling System Mercury Utility Devices Substitution 60 Hazardous Waste $1,750 $2,500 $1 of one PCB spill and clean-up event. Organic Solvents Substitution 678 Hazardous Waste $1,355 $36,500 $26

495

Advanced Topics in Types and Programming Languages  

E-Print Network [OSTI]

Advanced Topics in Types and Programming Languages Benjamin C. Pierce, editor The MIT Press Advanced Topics in Types and programming languages / Benjamin C. Pierce, editor p. cm. Includes bibliographical references and index. ISBN 0-262-16228-8 (hc.: alk. paper) 1. Programming languages (Electronic

Pitts, Andrew

496

Improving Type Ia Supernova Standard Candle Cosmology Measurements Using Observations of Early-Type Host Galaxies  

E-Print Network [OSTI]

Host Galaxies of Type Ia Supernovae Introduction SN Ia Hosts109 C HAPTER 1 Cosmology, Type Ia Supernovae and HostGalaxies Observations of supernovae have played a role in

Meyers, Joshua Evan

2012-01-01T23:59:59.000Z

497

C Reference Card (ANSI) Constants Flow of Control suffix: long, unsigned,6float5536L,s-1U,t3.0Fate*  

E-Print Network [OSTI]

C Reference Card (ANSI) Constants Flow of Control(var)dtexteclarationsdeclaration of members Example. #define max(A,B) ((A)>(B)}?;(A) : (B)) ANSI Standard Libra* *ries undefine

Silverman, Joseph H.

498

Weighted?density?functional theory calculation of elastic constants for face?centered?cubic and body?centered?cubic hard?sphere crystals  

E-Print Network [OSTI]

The isothermal elastic constants for the face?centered?cubic (fcc) and body?centered?cubic (bcc) hard?sphere crystal are calculated for a range of densities using the modified weighted?density functional of Denton and ...

Laird, Brian Bostian

1992-06-01T23:59:59.000Z

499

Theoretical cosmic Type Ia supernova rates  

E-Print Network [OSTI]

The aim of this work is the computation of the cosmic Type Ia supernova rates at very high redshifts (z>2). We adopt various progenitor models in order to predict the number of explosions in different scenarios for galaxy formation and to check whether it is possible to select the best delay time distribution model, on the basis of the available observations of Type Ia supernovae. We also computed the Type Ia supernova rate in typical elliptical galaxies of different initial luminous masses and the total amount of iron produced by Type Ia supernovae in each case. It emerges that: it is not easy to select the best delay time distribution scenario from the observational data and this is because the cosmic star formation rate dominates over the distribution function of the delay times; the monolithic collapse scenario predicts an increasing trend of the SN Ia rate at high redshifts whereas the predicted rate in the hierarchical scheme drops dramatically at high redshift; for the elliptical galaxies we note that the predicted maximum of the Type Ia supernova rate depends on the initial galactic mass. The maximum occurs earlier (at about 0.3 Gyr) in the most massive ellipticals, as a consequence of downsizing in star formation. We find that different delay time distributions predict different relations between the Type Ia supernova rate per unit mass at the present time and the color of the parent galaxies and that bluer ellipticals present higher supernova Type Ia rates at the present time.

R. Valiante; F. Matteucci; S. Recchi; F. Calura

2009-03-16T23:59:59.000Z

500

Formulas/Constants: Physics/Oceanography 4500/5500 A Atmospheric Physics In addition to these formulas, there are many thermodynamic concepts and interrelationships between  

E-Print Network [OSTI]

at the lifting condensation level: TLCL = 9.8Tdo - 1.8To 8 Entropy S = S0 + CV ln( TV -1 T0V -1 0 ) where T0 weight of each consituent. R = 8.314 J mol-1 K-1 is the universal gas constant. p = RdTv (for moist air where Tv is the virtual temperature) Rv = 461.5 J/(kg K) (ideal gas constant for water vapor) = Mv

Folkins, Ian