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1

E-Print Network 3.0 - antiknock ratings Sample Search Results  

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

etryandgaschromatography-thermal conductivity techniques. A rate law is developed for the removal of MTBE from an aqueous solution in the DMP... reactor. Rate constants are also...

2

Model-Based Development of Distributed Embedded Systems by the Example of the Scicos/SynDEx Framework  

E-Print Network [OSTI]

The embedded systems engineering industry faces increasing demands for more functionality, rapidly evolving components, and shrinking schedules. Abilities to quickly adapt to changes, develop products with safe design, minimize project costs, and deliver timely are needed. Model-based development (MBD) follows a separation of concerns by abstracting systems with an appropriate intensity. MBD promises higher comprehension by modeling on several abstraction-levels, formal verification, and automated code generation. This thesis demonstrates MBD with the Scicos/SynDEx framework on a distributed embedded system. Scicos is a modeling and simulation environment for hybrid systems. SynDEx is a rapid prototyping integrated development environment for distributed systems. Performed examples implement well-known control algorithms on a target system containing several networked microcontrollers, sensors, and actuators. The addressed research question tackles the feasibility of MBD for medium-sized embedded systems. In ...

Fischer, Bernhard

2010-01-01T23:59:59.000Z

3

CONTRACTNO.: DE-X13-96GJ87335 TASK ORDER NO.: h  

Office of Legacy Management (LM)

March 13,2001 March 13,2001 CONTRACTNO.: DE-X13-96GJ87335 TASK ORDER NO.: h l K O I - 0 6 CONTROLNO.: 3100-T01-0440 Project Manager Department of Energy Grand Junction Office 2597 B314 Road Grand Junction, CO 81503 ATTN: Mr. Art Kleinrath SUBJECT: Contract No. DE-AC13-96GJ87335-Radon and Direct Gamma Monitoring at the Shiprock, NM Disposal Site Dear Mr. Kleinrath: MACTEC-ERS has completed radon and direct gamma monitoring at the Shiprock, NM disposal site. The attached data summary tables demonstrate that both radon and direct gamma radiation levels at the disposal site are indistinguishable froin naturally occurring background levels. Therefore, we conclude that the disposal cell is effectively containing radon emissio~is and is in compliance with applicable standards and regulations.

4

X:\\L6046\\Data_Publication\\Pma\\current\\ventura\\pma.vp  

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

antiknock performance in motor vehicle engines. The two recognized laboratory engine test methods for determining the antiknock rating, i.e., octane rat- ing, of gasolines are...

5

THE ASTRONOMICAL JOURNAL, 118:29932996, 1999 December 1999. The American Astronomical Society. All rights reserved. Printed in U.S.A.(  

E-Print Network [OSTI]

that display a mild to pronounced metal deÐciency in Fe-peak elements (up to 2 dex below solar abundance

Thaxton, Christopher S.

6

A compendium of gene expression in normal human tissues  

E-Print Network [OSTI]

Gene Expression Index, the HuGE In- dex, http://www.hugeindex.org) for future studies of patho completion of the human genome project (8, 37a), greater attention is now focused on defining the biological

Weng, Zhiping

7

Motor gasolines, Summer 1982  

SciTech Connect (OSTI)

The samples were collected from service stations throughout the country and were analyzed in the laboratories of various refiners, motor manufacturers, and chemical companies. The analytical data for 796 samples of motor gasoline, were submitted to the Bartlesville Energy Technology Center for study, necessary calculations, and compilation under a cooperative agreement between the Bartlesville Energy Technology Center (BETC) and the American Petroleum Institute (API). They represent the products of 22 companies, large and small, which manufacture and supply gasoline. These data are tabulated by groups according to brands (unlabeled) and grades for 17 marketing districts into which the country is divided. A map included in this report, shows marketing areas, districts and sampling locations. The report also includes charts indicating the trends of selected properties of motor fuels since 1959. Sixteen octane distribution percent charts for areas 1, 2, 3, and 4 for unleaded antiknock index (R + M)/2 below 90.0, unleaded antiknock index (R + M)/2 90.0 and above, leaded antiknock index (R + M)/2 below 93.0, and leaded antiknock index (R + M)/2 93.0 and above grades of gasoline are presented in this report. The antiknock (octane) index (R + M)/2 averages of gasoline sold in this country were 87.3 for unleaded below 90.0, 91.7 for unleaded 90.0 and above, 89.0 for leaded below 93.0, and no data in this report for 93.0 and above grades of leaded gasoline.

Shelton, E.M.

1983-03-01T23:59:59.000Z

8

Motor gasolines, Winter 1980-81  

SciTech Connect (OSTI)

Analytical data for 546 samples of motor gasoline, were collected from service stations throughout the country and were analyzed in the laboratories of various refiners, motor manufacturers, and chemical companies. The data were submitted to the Bartlesville Energy Technology Center for study, necessary calculations, and compilation under a cooperative agreement between the Bartlesville Energy Technology Center (BETC) and the American Petroleum Institute (API). The samples represent the products of 23 companies, large and small, which manufacture and supply gasoline. These data are tabulated by groups according to brands (unlabeled) and grades for 17 marketing districts into which the country is divided. A map included in this report, shows marketing areas, districts and sampling locations. The report also includes charts indicating the trends of selected properties of motor fuels since 1959. Sixteen octane distribution percent charts for areas 1, 2, 3, and 4 for unleaded antiknock index (R+M)/2 below 90.0, unleaded antiknock index (R+M)/2 90.0 and above, leaded antiknock index (R+M)/2 below 93.0, and leaded antiknock index (R+M)/2 93.0 and above grades of gasoline are presented in this report. The antiknock (octane) index (R+M)/2 averages of gasoline sold in this country were 87.6 unleaded below 90.0, 91.4 unleaded 90.0 and above, 89.1 leaded below 93.0, and 93.3 leaded 93.0 and above grades of gasoline.

Shelton, E.M.

1981-07-01T23:59:59.000Z

9

A model for the emergence of pillars, walls and royal chambers in termite nests  

E-Print Network [OSTI]

A model for the emergence of pillars, walls and royal chambers in termite nests Eric Bonabeau1, 31062 Toulouse Ce¨ dex, France A simple model of the emergence of pillars in termite nests by Deneubourg construction modi¢es current building conditions, we hypothesize that nest complexity can result from

Theraulaz, Guy

10

Motor gasolines, winter 1982-83  

SciTech Connect (OSTI)

Analytical data for 1330 samples of motor gasoline, were collected from service stations throughout the country and were analyzed in the laboratories of various refiners, motor manufacturers, and chemical companies. The data were submitted to the Bartlesville Energy Technology Center for study, necessary calculations, and compilation under a cooperative agreement between the Bartlesville Energy Technology Center (BETC) and the American Petroleum Institute (API). The samples represent the products of 28 companies, large and small, which manufacture and supply gasoline. These data are tabulated by groups according to brands (unlabeled) and grades for 17 marketing districts into which the country is divided. A map included in this report, shows marketing areas, districts and sampling locations. The report also includes charts indicating the trends of selected properties of motor fuels since winter 1959-1960 survey for the leaded gasolines, and since winter 1979-1980 survey for the unleaded gasolines. Sixteen octane distribution percent charts for areas 1, 2, 3, and 4 for unleaded antiknock index (R + M)/2 below 90.0, unleaded antiknock index (R + M/2 90.0 and above, leaded antiknock index (R + M)/2 below 93.0, and leaded antiknock index (R + M)/2 93.0 and above grades of gasoline are presented in this report. The antiknock (octane) index (R + M)/2 averages of gasoline sold in this country were 87.3 for unleaded below 90.0, 91.5 for unleaded 90.0 and above, and 89.1 for leaded below 93.0, and no data was reported in this report for leaded gasolines with an antiknock index (R + M)/2 93.0 and above. 21 figures, 5 tables.

Shelton, E.M.

1983-07-01T23:59:59.000Z

11

Motor gasolines, winter 1981-1982  

SciTech Connect (OSTI)

Analytical data for 905 samples of motor gasoline, were collected from service stations throughout the country and were analyzed in the laboratories of various refiners, motor manufacturers, and chemical companies. The data were submitted to the Bartlesville Energy Technology Center for study, necessary calculations, and compilation under a cooperative agreement between the Bartlesville Energy Technology Center (BETC) and the American Petroleum Institute (API). The samples represent the products of 30 companies, large and small, which manufacture and supply gasoline. These data are tabulated by groups according to brands (unlabeled) and grades for 17 marketing districts into which the country is divided. A map included in this report, shows marketing areas, districts and sampling locations. The report also includes charts indicating the trends of selected properties of motor fuels since winter 1959-1960 survey for the leaded gasolines, and since winter 1979-1980 survey for the unleaded gasolines. Sixteen octane distribution percent charts for areas 1, 2, 3, and 4 for unleaded antiknock index (R+M)/2 below 90.0, unleaded antiknock index (R+M)/2 90.0 and above, leaded antiknock index (R+M)/2 below 93.0, and leaded antiknock index (R+M)/2 93.0 and above grades of gasoline are presented in this report. The antiknock (octane) index (R+M)/2 averages of gasoline sold in this country were 87.4 for unleaded below 90.0, 91.7 for unleaded 90.0 and above, and 88.9 for leaded below 93.0. Only one sample was reported as 93.0 for leaded gasolines with an antiknock index (R+M)/2 93.0 and above.

Shelton, E M

1982-07-01T23:59:59.000Z

12

The Transcription Factor WIN1/SHN1 Regulates Cutin Biosynthesis in Arabidopsis thaliana  

Science Journals Connector (OSTI)

...WIN1 activity was induced by DEX led to the identification of putative...white light (50 to 70 muE21) from fluorescent bulbs. Cutin and Wax Analysis Cuticular...cloning and expression of tagged fluorescent protein in plant cells. Trends...

Rubini Kannangara; Caroline Branigan; Yan Liu; Teresa Penfield; Vijaya Rao; Grégory Mouille; Herman Höfte; Markus Pauly; José Luis Riechmann; Pierre Broun

2007-04-20T23:59:59.000Z

13

DISSECTING THE STELLAR-MASS-SFR CORRELATION IN z = 1 STAR-FORMING DISK GALAXIES  

SciTech Connect (OSTI)

Using a mass-limited sample of 24 {mu}m detected, star-forming galaxies at 0.5 < z < 1.3, we study the mass-star formation rate (SFR) correlation and its tightness. The correlation is well defined ({sigma} = 0.28 dex) for disk galaxies (n{sub Sersic} < 1.5), while more bulge-dominated objects often have lower specific SFRs (sSFRs). For disk galaxies, a much tighter correlation ({sigma} = 0.19 dex) is obtained if the rest-frame H-band luminosity is used instead of stellar mass derived from multi-color photometry. The sSFR correlates strongly with rest-frame optical colors (hence luminosity-weighted stellar age) and also with clumpiness (which likely reflects the molecular gas fraction). This implies that most of the observed scatter is real, despite its low level, and not dominated by random measurement errors. After correcting for these differential effects a remarkably small dispersion remains ({sigma} = 0.14 dex), suggesting that measurement errors in mass or SFR are {approx}< 0.10 dex, excluding systematic uncertainties. Measurement errors in stellar masses, the thickening of the correlation due to real sSFR variations, and varying completeness with stellar mass, can spuriously bias the derived slope to lower values due to the finite range over which observables (mass and SFR) are available. When accounting for these effects, the intrinsic slope for the main sequence for disk galaxies gets closer to unity.

Salmi, F.; Daddi, E.; Elbaz, D.; Sargent, M. T.; Bethermin, M. [Laboratoire AIM, CEA/DSM-CNRS-Universite Paris Diderot, Irfu/Service d'Astrophysique, CEA Saclay, Orme des Merisiers, F-91191 Gif-sur-Yvette Cedex (France); Dickinson, M. [National Optical Astronomy Observatory, 950 N. Cherry Ave., Tucson, AZ 85719 (United States); Renzini, A. [INAF-Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 2, I-35122 Padova (Italy); Le Borgne, D., E-mail: fadia.salmi@cea.fr, E-mail: edaddi@cea.fr [Institut d'Astrophysique de Paris, UMR 7095 CNRS, UPMC, 98 bis boulevard Arago, F-75014 Paris (France)

2012-07-20T23:59:59.000Z

14

Transcription Repressor HANABA TARANU Controls Flower Development by Integrating the Actions of Multiple Hormones, Floral Organ Specification Genes, and GATA3 Family Genes in Arabidopsis  

Science Journals Connector (OSTI)

...assay. In the X-Gal colony lift assay, HAN interacts with HAN...DEX-treated plants at each time point were cohybridized, and labeling...reduce dye-related bias. Four biological replicates were used...2002). If multiple data points corresponded to the same gene...

Xiaolan Zhang; Yun Zhou; Lian Ding; Zhigang Wu; Renyi Liu; Elliot M. Meyerowitz

2013-01-18T23:59:59.000Z

15

Abundances and kinematics of K giants in the galactic nuclear bulge  

SciTech Connect (OSTI)

Spectroscopy and photometry were obtained for 100 K giants in Baade's Window at l = 1/sup 0/, b = -4/sup 0/. The abundance distribution of the nuclear bulge K giants was derived relative to 45 stars of known abundance. The abundances run from -1 to nearly +1 dex, with a peak at 0.3 dex, or twice the solar abundance. Of the 88 stars with derived abundances, 22% exceeded the abundance of the most metal rich local K giants; 50% exceeded the solar abundance, and 10% were metal poor (< -0.6 dex). Radial velocities were measured for 53 nuclear bulge K giants which also have derived abundances. Their velocity dispersion is 104 km/sec. The mean velocity is -19 +/- 14 km/sec; within 1 sigma of the solar Pi velocity of -10 km/sec. When this sample is divided into 3 subsets based on the abundances, the subset of 21 stars > 0.3 dex has sigma = 92 +/- 14 km/sec and the metal poor subset of 16 stars <-0.3 dex has J = 126 +/- 22 km/sec. An intermediate set of 16 stars has sigma = 97 +/- 17 km/sec. The most metal rich stars may have a bulk velocity of -38 +/- 14 km/sec, 1sigma less than the -19 km/sec of the metal poor stars. No evidence was found that either the metal rich or metal poor stars follow the galactic rotation curve; hence, neither population appears to be rotation supported. Optical and infrared photometry is presented for nuclear bulge K giants. The colors of these stars are shown to be too hot for their derived metal abundances.

Rich, R.M.

1986-01-01T23:59:59.000Z

16

Bromine function in halite geochemistry  

SciTech Connect (OSTI)

Of the halogens or salt formers, bromine is the only nonmetal which occurs naturally as a poisonous liquid much denser than water. The power of its atoms, expressed by a valence of 1 and 5, makes it unite directly with a large number of metallic elements to form salts. As a rare and strongly electronegative element of group VII in the periodic table, bromine exists in seawater and evaporitic brines as bromide with a ratio to chlorinity of 0.00348. Most water detains only about 1 ppm bromide for each 300 ppm of chloride. The most abundant source of bromine is ocean water (65 ppm Br), but richer peps occur in salt deposits and primarily in mineral brines. Atomic absorption spectrophotometric resolutions of Permian Castile halites exposed low values of bromine compared with its higher quantities in modern oceans like the Mediterranean. Bromine analyses of the two petrographically distinct forms of halite that characterize many ancient evaporite deposits, as in the Elk Point basin fields of Alberta, imply they crystallized from brines of noticeably different concentrations. Bromine in halite has been used as a paleosalinity indicator and a stratigraphic marker. Bromine liquid, with an atomic weight of 79.904 and atomic number 35, is used in producing gasoline antiknock mixtures, fumigants, photographic chemicals, drilling fluids, and fire retardants. It is also highly toxic and corrosive as bromine gas. Bromine contents greater than 1 ppm may be unsafe in the atmosphere, and a dose of 500 ppm can lead to death in less than an hour.

Billo, S.M. (King Saud Univ., Riyadh (Saudi Arabia))

1991-06-01T23:59:59.000Z

17

Fuel additives. January 1984-December 1991 (Citations from the NTIS Data Base). Rept. for Jan 84-Dec 91  

SciTech Connect (OSTI)

The bibliography contains citations concerning effects; evaluations; and production methods of additives in automotive, aviation, diesel, and boiler fuels. Antioxidant, antiicing, antistatic, corrosion inhibitors, antiknock, and depressant additives relative to evaluations and testing are among the topics discussed. (Contains 165 citations with title list and subject index.)

Not Available

1991-11-01T23:59:59.000Z

18

Fuel additives. January 1970-August 1989 (Citations from the COMPENDEX data base). Report for January 1970-August 1989  

SciTech Connect (OSTI)

This bibliography contains citations concerning effects; evaluations; and production methods of additives in automotive, aviation, diesel, and boiler fuels. Antioxidant, antiicing, antistatic, corrosion inhibitors, antiknock, and depressant additives relative to evaluations and testing are among the topics discussed. (This updated bibliography contains 223 citations, 56 of which are new entries to the previous edition.)

Not Available

1989-09-01T23:59:59.000Z

19

Motor gasolines, summer 1981  

SciTech Connect (OSTI)

The samples were collected from service stations throughout the country and were analyzed in the laboratories of various refiners, motor manufacturers, and chemical companies. The analytical data for 715 samples of motor gasoline were submitted to the Bartlesville Energy Technology Center for study, necessary calculations, and compilation under a cooperative agreement between the Bartlesville Energy Technology Center (BETC) and the American Petroleum Institute (API). They represent the products of 33 companies, large and small, which manufacture and supply gasoline. These data are tabulated by groups according to brands (unlabeled) and grades for 17 marketing included in this report shows marketing districts into which the country is divided. A map included in this report shows marketing areas, districts and sampling locations. The report also includes charts indicating the trends of selected properties of motor fuels since 1959. Sixteen octane distribution percent charts for areas 1, 2, 3, and 4 for unleaded antiknock index (R+M)/2 below 90.0, unleaded antiknock index (R+M)/2 90.0 and above, leaded antiknock index (R+M)/2 below 93.0, and leaded antiknock index (R+M)/2 93.0 and above grades of gasoline are presented in this report. The antiknock (octane) index (R+M)/2 averages of gasoline sold in this country were 87.4 for unleaded below 90.0, 91.3 for unleaded 90.0 and above, 89.0 for leaded below 93.0, and no data in this report for 93.0 and above grades of leaded gasoline.

Shelton, E.M.

1982-04-01T23:59:59.000Z

20

The Sun. A typical star in the solar neighborhood?  

E-Print Network [OSTI]

The Sun is used as the fundamental standard in chemical abundance studies, thus it is important to know whether the solar abundance pattern is representative of the solar neighborhood. Albeit at low precision (0.05 - 0.10 dex) the Sun seems to be a typical solar-metallicity disk star, at high precision (0.01 dex) its abundance pattern seems abnormal when compared to solar twins. The Sun shows a deficiency of refractory elements that could be due to the formation of terrestrial planets. The formation of giant planets may also introduce a signature in the chemical composition of stars. We discuss both planet signatures and also the enhancement of neutron-capture elements in the solar twin 18 Sco.

Melendez, Jorge

2013-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "antiknock in dex" 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

On the lithium dip in the metal poor open cluster NGC 2243  

SciTech Connect (OSTI)

Lithium is a key element for studying the mixing mechanisms operating in stellar interiors. It can also be used to probe the chemical evolution of the Galaxy and the Big Bang nucleosynthesis. Measuring the abundance of Lithium in stars belonging to Open Clusters (hereafter OC) allows a detailed comparison with stellar evolutionary models. NGC 2243 is particularly interesting thanks to its relative low metallicity ([Fe/H]=?0.54 0.10 dex). We performed a detailed analysis of high-resolution spectra obtained with the multi-object facility FLAMES at the VLT 8.2m telescope. Lithium abundance has been measured in 27 stars. We found a Li dip center of 1.06 M{sub ?}, which is significantly smaller than that observed in solar metallicity and metal-rich clusters. This finding confirms and strengthens the conclusion that the mass of the stars in the Li dip strongly depends on stellar metallicity. The mean Li abundance of the cluster is log n(Li) = 2.70 dex, which is substantially higher than that observed in 47 Tue. We derived an iron abundance of [Fe/H]=?0.540.10 dex for NGC 2243, in agreement (within the errors) with previous findings.

Franois, P. [GEPI, Paris-Meudon Observatory, 61 Avenue de l'Observatoire, F-75014 Paris (France); Pasquini, L.; Palsa, R. [ESO, European Southern Observatory, Karl-Schwarzschild-Str. 2, 85748 Garching bei Mnchen (Germany); Biazzo, K. [INAF, Capodimonte Astronomical Observatory, via Moiariello 16, 80131 Naples (Italy); Bonifacio, P. [GEPI, Paris-Meudon Observatory, Place Jules Janssen 92190, Meudon (France)

2014-05-02T23:59:59.000Z

22

Bromine enrichment in marsh sediments as a marker of environmental changes driven by Grand Solar Minima and anthropogenic activity (Caminha, NW of Portugal)  

Science Journals Connector (OSTI)

Abstract A sediment core collected in Caminha tidal marsh, NW Portugal, was used to assess bromine (Br) signal over the last ca. 1700years. The Br temporal variability reflects its close relationship with soil/sediment organic matter (OM) and also alterations in Br biogeochemical recycling in marsh environment. The highest Br enrichment in sediments was found during the Maunder Solar Minimum, a major solar event characterized by lower irradiance (TSI) and temperature, increased cloudiness and albedo. The obtained results suggest that those climate-induced changes weakened the natural mechanisms that promote Br biochemical transformations, driven by both living plants metabolism and plant litter degradation, with the ensuing generation of volatile methyl bromide (CH3Br). It seems that the prevailing climate conditions during the Maunder favoured the retention of more Br in marsh ecosystem, ultimately decreasing the biogenic Br emissions to the atmosphere. During the 20th century, the Br pattern in sediments appears to mirror likewise anthropogenic sources. The significant correlation (p<0.05) between Br/OM ratios and Pb contents in sediments after 1934 suggests a common source. This is most probably related with the rise, massive consumption and prohibition of leaded gasoline, where ethylene dibromide was added as lead scavenger to antiknock mixtures. More regionally, the concerted use of flame retardants on forest fire management, covering the 1980s through mid-1990s in the north of Portugal and Galicia, could be responsible for the observed increase of sediment Br (relatively to Pb) pool of this tidal marsh. Although man-made brominated compounds are being phased-out since the inception of the 1992 Montreal Protocol, the Caminha tidal marsh sedimentary record showed that Br levels only started to decline after 2002.

J. Moreno; F. Fatela; E. Leorri; M.F. Arajo; F. Moreno; J. De la Rosa; M.C. Freitas; T. Valente; D.R. Corbett

2015-01-01T23:59:59.000Z

23

Quantitative Spectroscopy of 24 A supergiants in the Sculptor galaxy NGC 300: Flux weighted gravity luminosity relationship, metallicity and metallicity gradient  

E-Print Network [OSTI]

A quantitative spectral analysis of 24 A supergiants in the Sculptor Group spiral galaxy NGC 300 at a distance of 1.9 Mpc is presented. A new method is introduced to analyze low resolution (~5 AE) spectra, which yields metallicities accurate to 0.2 dex including the uncertainties arising from the errors in Teff (5%) and log g (0.2 dex). For the first time the stellar metallicity gradient based on elements such as titanium and iron in a galaxy beyond the Local Group is investigated. Solar metallicity is measured in the center and 0.3 solar in the outskirts and a logarithmic gradient of -0.08 dex/kpc. An average reddening of E(B-V)~0.12 mag is obtained, however with a large variation from 0.07 to 0.24 mag. We also determine stellar radii, luminosities and masses and discuss the evolutionary status. Finally, the observed relationship between absolute bolometric magnitudes M_{bol} and flux weighted gravities g_{F} = g/Teff^4 is investigated. At high temperatures the strengths of the Balmer lines depends solely on the flux-weighted gravity, which allows a precise direct determination of log g_{F} with an accuracy of 0.05 to 0.1 dex. We find a tight relationship between M_{bol} and log g_{F} in agreement with stellar evolution theory. Combining these new results with previous work on Local Group galaxies we obtain a new flux weighted gravity luminosity relationship (FGLR), which is very well defined and appears to be an excellent alternative tool to determine distances to galaxies.

R. -P. Kudritzki; M. A. Urbaneja; F. Bresolin; N. Przybilla; W. Gieren; G. Pietrzynski

2008-03-26T23:59:59.000Z

24

Post-transcriptional regulation of gene expression by the DExD/H-box protein Dhh1  

E-Print Network [OSTI]

A. , J. Rehwinkel, M. Stricker, E. Huntzinger, S.F. Yang, T.A. , J. Rehwinkel, M. Stricker, E. Huntzinger, S.F. Yang, T.

Carroll, Johanna Shumway

2011-01-01T23:59:59.000Z

25

Localization lengths for Schroedinger operators on Z^2 with decaying random potentials  

E-Print Network [OSTI]

We study a class of Schr\\"odinger operators on $\\Z^2$ with a random potential decaying as $|x|^{-\\dex}$, $00$. These estimates "interpolate" between the lower bound $\\lambda^{-2+\\eta}$ due to recent work of Schlag-Shubin-Wolff for $\\dex=0$, and pure a.c. spectrum for $\\dex>\\frac12$ demonstrated in recent work of Bourgain.

Thomas Chen

2005-03-28T23:59:59.000Z

26

3D Hydrodynamical Simulations of Surface Convection in Red Giant Stars. Impact on spectral line formation and abundance analysis  

E-Print Network [OSTI]

We investigate the impact of 3D hydrodynamical model atmospheres of red giant stars at different metallicities on the formation of spectral lines of a number of ions and molecules. We carry out realistic 3D simulations of surface convection in red giant stars with varying stellar parameters. We use the simulations as time-dependent hydrodynamical model stellar atmospheres to compute atomic (Li, O, Na, Mg, Ca, Fe) and molecular (CH, NH, OH) spectral lines under the assumption of local thermodynamic equilibrium (LTE). We compare the line strengths computed in 3D with the results of analogous line formation calculations for 1D, hydrostatic, plane-parallel MARCS model atmospheres in order to estimate the impact of 3D models on the derivation of elemental abundances. The temperature and density inhomogeneities and correlated velocities in 3D models, as well as the differences between the 1D and mean 3D structures significantly affect the predicted line strengths. Under the assumption of LTE, the low atmospheric temperatures of very metal-poor 3D model atmospheres cause the lines from neutral species and molecules to appear stronger than in 1D. Therefore, elemental abundances derived from these lines using 3D models are significantly lower than according to 1D analyses. Differences between 3D and 1D abundances of C, N, and O derived from CH, NH, and OH weak low-excitation lines are found to be in the range -0.5 dex to -1.0 dex for the the red giant stars at [Fe/H]=-3 considered here. At this metallicity, large negative corrections (about -0.8 dex) are also found for weak low-excitation Fe I lines. We caution, however, that departures from LTE might be significant for these and other elements and comparable to the effects due to stellar granulation.

Remo Collet; Martin Asplund; Regner Trampedach

2007-03-26T23:59:59.000Z

27

TESTING FOR AZIMUTHAL ABUNDANCE GRADIENTS IN M101  

SciTech Connect (OSTI)

New optical spectra of 28 H II regions in the M101 disk have been obtained, yielding 10 new detections of the [O III] {lambda}4363 auroral line. The oxygen abundance gradient measured from these data, combined with previous observations, displays a local scatter of 0.15 {+-} 0.03 dex along an arc in the west side of the galaxy, compared with a smaller scatter of 0.08 {+-} 0.01 dex in the rest of the disk. One of the H II regions in our sample (H27) has a significantly lower oxygen abundance than surrounding nebulae at a similar galactocentric distance, while an additional, relatively nearby one (H128) was already known to have a high oxygen abundance for its position in the galaxy. These results represent marginal evidence for the existence of moderate deviations from chemical abundance homogeneity in the interstellar medium of M101. Using a variety of strong-line abundance indicators, we find no evidence for significant large-scale azimuthal variations of the oxygen abundance across the whole disk of the galaxy.

Li, Yanxia; Bresolin, Fabio [Institute for Astronomy, 2680 Woodlawn Dr., Honolulu, HI 96822 (United States)] [Institute for Astronomy, 2680 Woodlawn Dr., Honolulu, HI 96822 (United States); Kennicutt, Robert C. Jr. [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA (United Kingdom)] [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA (United Kingdom)

2013-03-20T23:59:59.000Z

28

Magnesium Isotope Ratios in omega Centauri Red Giants  

E-Print Network [OSTI]

We have used high resolution observations obtained at the AAT with UHRF (R ~ 100,000) and at Gemini-S with b-HROS (R ~ 150,000) to determine magnesium isotope ratios for seven omega Centauri red giants that cover a range in iron abundance from [Fe/H] = --1.78 to --0.78 dex, and for two red giants in M4 (NGC 6121). The omega Centauri stars sample both the "primordial" (i.e., O-rich, Na and Al-poor) and the "extreme" (O-depleted, Na and Al-rich) populations in the cluster. The primordial population stars in both omega Centauri and M4 show (25Mg, 26Mg)/24 Mg isotopic ratios that are consistent with those found for the primordial population in other globular clusters with similar [Fe/H] values. The isotopic ratios for the omega Centauri extreme stars are also consistent with those for extreme population stars in other clusters. The results for the extreme population stars studied indicate that the 26Mg/24Mg ratio is highest at intermediate metallicities ([Fe/H] < --1.4 dex), and for the highest [Al/Fe] values....

Da Costa, G S; Yong, David

2013-01-01T23:59:59.000Z

29

On the Abundance of Holmium in the Sun  

E-Print Network [OSTI]

The abundance of holmium (Z = 67) in the Sun remains uncertain. The photospheric abundance, based on lines of Ho II, has been reported as +0.26 +/- 0.16 (on the usual scale where log(H) = 12.00), while the meteoretic value is +0.51 +/- 0.02. Cowan code calculations have been undertaken to improve the partition function for this ion by including important contributions from unobserved levels arising from the (4f^{11}6p + 4f^{10}(5d + 6s)^{2}) group. Based on 6994 computed energy levels, the partition function for Ho II is 67.41 for a temperature of 6000 K. This is approximately 1.5 times larger than the value derived from the 49 published levels. The new partition function alone leads to an increase in the solar abundance of Ho to log(Ho) = +0.43. This is within 0.08 dex of the meteoretic abundance. Support for this result has been obtained through LTE spectrum synthesis calculations of a previously unidentified weak line at 3416.38 A in the solar spectrum. Attributing the feature to Ho II, the observations may be fitted with log(Ho) = +0.53. This calculation assumes log(gf) = 0.25 and is uncertain by at least 0.1 dex.

Donald J. Bord; Charles R. Cowley

2002-07-26T23:59:59.000Z

30

Oxygen abundances in planet-harbouring stars. Comparison of different abundance indicators  

E-Print Network [OSTI]

We present a detailed and uniform study of oxygen abundances in 155 solar type stars, 96 of which are planet hosts and 59 of which form part of a volume-limited comparison sample with no known planets. EW measurements were carried out for the [O I] 6300 \\AA line and the O I triplet, and spectral synthesis was performed for several OH lines. NLTE corrections were calculated and applied to the LTE abundance results derived from the O I 7771-5 \\AA\\ triplet. Abundances from [O I], the O I triplet and near-UV OH were obtained in 103, 87 and 77 dwarfs, respectively. We present the first detailed and uniform comparison of these three oxygen indicators in a large sample of solar-type stars. There is good agreement between the [O/H] ratios from forbidden and OH lines, while the NLTE triplet shows a systematically lower abundance. We found that discrepancies between OH, [O I] and the O I triplet do not exceed 0.2 dex in most cases. We have studied abundance trends in planet host and comparison sample stars, and no obvious anomalies related to the presence of planets have been detected. All three indicators show that, on average, [O/Fe] decreases with [Fe/H] in the metallicity range -0.8oxygen overabundance of 0.1-0.2dex with respect to the comparison sample.

A. Ecuvillon; G. Israelian; N. C. Santos; N. G. Shchukina; M. Mayor; R. Rebolo

2005-09-13T23:59:59.000Z

31

Are oxygen and neon enriched in PNe and is the current solar Ne/O abundance ratio underestimated?  

E-Print Network [OSTI]

A thorough critical literature survey has been carried out for reliable measurements of oxygen and neon abundances of planetary nebulae (PNe) and HII regions. By contrasting the results of PNe and of HII regions, we aim to address the issues of the evolution of oxygen and neon in the interstellar medium (ISM) and in the late evolutionary phases of low- and intermediate-mass stars (LIMS), as well as the currently hotly disputed solar Ne/O abundance ratio. Through the comparisons, we find that neon abundance and Ne/O ratio increase with increasing oxygen abundance in both types of nebulae, with positive correlation coefficients larger than 0.75. The correlations suggest different enrichment mechanisms for oxygen and neon in the ISM, in the sense that the growth of neon is delayed compared to oxygen. The differences of abundances between PNe and HII regions, are mainly attributed to the results of nucleosynthesis and dredge-up processes that occurred in the progenitor stars of PNe. We find that both these alpha-elements are significantly enriched at low metallicity (initial oxygen abundance oxygen in intermediate mass stars (IMS) of low initial metallicities and in more massive stars, a conjecture that requires verification by further theoretical studies. This result also strongly suggests that both the solar neon abundance and the Ne/O ratio should be revised upwards by ~0.22 dex from the Asplund, Grevesse & Sauval values or by ~0.14 dex from the Grevesse & Sauval values.

W. Wang; X. -W. Liu

2008-06-13T23:59:59.000Z

32

Discovery of $\\sim$ 9,000 new RR Lyrae in the Southern Catalina Surveys  

E-Print Network [OSTI]

We present the results of a deep, wide-area variability survey in the Southern hemisphere, the first of its kind. As part of the Catalina Sky Surveys, the Siding Spring Survey (SSS) has covered $14,800$ square degrees in the declination range of $-75^{\\circ}\\leq\\delta\\leq-15^{\\circ}$. To mine the enormous SSS dataset efficiently we have developed two algorithms: Automatic Period Selection (APS) and Automatic Fourier Decomposition (AFD), which aim to sharpen the period estimation and produce robust lightcurve models. Armed with the APS and AFD outputs we classify $10,540$ ab-type RR Lyrae (RRab) stars ($\\sim$90% of which are new) across the Southern sky. As well as the positional information we supply photometric metallicities, and unreddened distances. For the RRab stars in the halo, a study of the photometric metallicity distribution reveals a nearly Gaussian shape with a mean metallicity of ${\\rm [Fe/H]}=-1.4$ dex and a dispersion of $0.3$ dex. A spatial study of the RRab metallicities shows no significant ...

Torrealba, G; Drake, A J; Djorgovski, S G; McNaught, R H; Belokurov, V; Koposov, S; Graham, M J; Mahabal, A; Larson, S; Christensen, E

2014-01-01T23:59:59.000Z

33

JNK and IKK? phosphorylation is reduced by glucocorticoids in adipose tissue from insulin-resistant rats  

Science Journals Connector (OSTI)

AbstractObjectives Peripheral insulin resistance (IR) is one of the main side effects caused by glucocorticoid (GC)-based therapies, and the molecular mechanisms of GC-induced IR are not yet fully elucidated. Thus, we aimed to investigate the effects of dexamethasone treatment on the main components of insulin and inflammatory signaling in the adipose tissue of rats. Materials/methods Male Wistar rats received daily injections of dexamethasone (1mg/kg body weight (b.w.), intraperitoneally (i.p.)) for 5 days (DEX), whereas control rats received saline (CTL). The metabolic status was investigated, and the epididymal fat fragments were collected for lipolysis and western blot analyses. Results The DEX rats became hyperglycemic, hyperinsulinemic, insulin resistant and glucose intolerant, compared with the CTL rats (Prats (Prats after an oral bolus of glucose (Prats (Prats (Prats induced by dexamethasone administration have PKB and IRS-1 activity attenuated in epididymal fat without increases in the phosphorylation of the proinflammatory signals JNK and IKK?.

Katia Motta; Amanda Marreiro Barbosa; Franciane Bobinski; Antonio Carlos Boschero; Alex Rafacho

2015-01-01T23:59:59.000Z

34

Stromgren photometry of Galactic Globular Clusters. II Metallicity distribution of red giants in Omega Centauri  

E-Print Network [OSTI]

We present new intermediate-band Stroemgren photometry based on more than 300 u,v,b,y images of the Galactic globular cluster Omega Cen. Optical data were supplemented with new multiband near-infrared (NIR) photometry (350 J,H,K_s images). The final optical-NIR catalog covers a region of more than 20*20 arcmin squared across the cluster center. We use different optical-NIR color-color planes together with proper motion data available in the literature to identify candidate cluster red giant (RG) stars. By adopting different Stroemgren metallicity indices we estimate the photometric metallicity for ~4,000 RGs, the largest sample ever collected. The metallicity distributions show multiple peaks ([Fe/H]_phot=-1.73+/-0.08,-1.29+/-0.03,-1.05+/-0.02,-0.80+/-0.04,-0.42+/-0.12 and -0.07+/-0.08 dex) and a sharp cut-off in the metal-poor tail ([Fe/H]_phot-1.7 dex).

Calamida, A; Stetson, P B; Freyhammer, L M; Piersimoni, A M; Buonanno, R; Caputo, F; Cassisi, S; Castellani, M; Corsi, C E; Dall'Ora, M; Degl'Innocenti, S; Ferraro, I; Grundahl, F; Hilker, M; Monelli, M; Nonino, M; Patat, N; Pietrinferni, A; Moroni, P G Prada; Primas, F; Pulone, L; Richtler, T; Romaniello, M; Storm, J; Walker, A R

2009-01-01T23:59:59.000Z

35

NEW CLUES ON THE NATURE OF THE COMPANION TO PSR J1740-5340 IN NGC 6397 FROM XSHOOTER SPECTROSCOPY  

SciTech Connect (OSTI)

By using XSHOOTER spectra acquired at the ESO Very Large Telescope, we have studied the surface chemical composition of the companion star to the binary millisecond pulsar PSR J1740-5340 in the globular cluster NGC 6397. The measured abundances of Fe, Mg, Al and Na confirm that the star belongs to the cluster. On the other hand, the measured surface abundance of nitrogen ([N/Fe] = +0.53 {+-} 0.15 dex) combined with the carbon upper limit ([C/Fe] < -2 dex) previously obtained from UVES spectra allow us to put severe constraints on its nature, strongly suggesting that the pulsar companion is a deeply peeled star. In fact, the comparison with theoretical stellar models indicates that the matter currently observed at the surface of this star has been processed by the hydrogen-burning CN-cycle at equilibrium. In turn, this evidence suggests that the pulsar companion is a low mass ({approx}0.2 M{sub Sun }) remnant star, descending from a {approx}0.8 M{sub Sun} progenitor which lost {approx}70%-80% of its original material because of mass transfer activity onto the pulsar.

Mucciarelli, A.; Lanzoni, B.; Pallanca, C.; Dalessandro, E.; Ferraro, F. R. [Dipartimento di Fisica and Astronomia, Universita degli Studi di Bologna, Viale Berti Pichat 6/2, I-40127 Bologna (Italy); Salaris, M. [Astrophysics Research Institute, Liverpool John Moores University, 12 Quays House, Birkenhead CH41 1LD (United Kingdom)

2013-08-01T23:59:59.000Z

36

The abundance distribution and luminosity function of globular clusters in NGC 1399  

SciTech Connect (OSTI)

Integrated Washington photometry has been obtained for the globular cluster system of NGC 1399, the central elliptical galaxy in the Fornax cluster. A new integrated metallicity index is defined which is about three times more sensitive to metal abundance than the previous such Washington index. Abundances accurate to 0.3 dex are derived for about 150 of the brightest globular clusters. The clusters have a broad, flattened abundance distribution with a mean metallicity of (Fe/H) = - 0.85 + or - 0.1, 0.75 dex more metal-poor than the halo. A significant fraction of the clusters have an approximately solar abundance, while virtually no clusters exist with (Fe/H) less than - 2. The luminosity function as determined for about 600 clusters clearly shows a turnover at T(1) = 23.0 + or - 0.15 or V = 23.45 + or - 0.16. A distance modulus of 31.0 + or - 0.25 is determined for Fornax, 0.5 + or - 0.2 mag closer than Virgo. 31 refs.

Geisler, D.; Forte, J.C. (Observatorio Interamericano de Cerro Tololo, La Serena (Chile) CONICET, Instituto de Astronomia y Fisica del Espacio, Buenos Aires (Argentina))

1990-02-01T23:59:59.000Z

37

Download  

Science Journals Connector (OSTI)

a sort of diversity index based upon the kinds of ... sity index drops, as does the diversity in- dex based on ... as there is a completion and diversification.

38

Striking Photospheric Abundance Anomalies in Blue Horizontal-Branch Stars in Globular Cluster M13  

E-Print Network [OSTI]

High-resolution optical spectra of thirteen blue horizontal-branch (BHB) stars in the globular cluster M13 show enormous deviations in element abundances from the expected cluster metallicity. In the hotter stars (T_eff > 12000 K), helium is depleted by factors of 10 to 100 below solar, while iron is enhanced to three times the solar abundance, two orders of magnitude above the canonical metallicity [Fe/H] ~= -1.5 dex for this globular cluster. Nitrogen, phosphorus, and chromium exhibit even more pronounced enhancements, and other metals are also mildly overabundant, with the exception of magnesium, which stays very near the expected cluster metallicity. These photospheric anomalies are most likely due to diffusion --- gravitational settling of helium, and radiative levitation of the other elements --- in the stable radiative atmospheres of these hot stars. The effects of these mechanisms may have some impact on the photometric morphology of the cluster's horizontal branch and on estimates of its age and distance.

Bradford B. Behr; Judith G. Cohen; James K. McCarthy; S. George Djorgovski

1999-03-29T23:59:59.000Z

39

Transcriptional Regulation of Metabolic Genes by Glucocorticoid Receptor  

E-Print Network [OSTI]

Dex or EtOH for 72 h. In sh-scr cells, p85? protein levelsinsulin/IGF-1 receptor. In sh-scr cells, pSer473-Akt andupon Dex treatment in sh-scr cells (Fig. 4A). After

Kuo, Taiyi

2012-01-01T23:59:59.000Z

40

Bourses thses Org Domaine Dure Dead line Particularit Lien  

E-Print Network [OSTI]

neurodénératives FONDATION MOTRICE avril http://www.lafondationmotrice.org/in dex://www.fdv-paris.org/fr/ecole- doctorale-fdv/ FONDATION MOTRICE avril may France ou étranger http://www.lafondationmotrice.org/in dex

Arleo, Angelo

Note: This page contains sample records for the topic "antiknock in dex" 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

CaII K observations of QSOs in the line-of-sight to the Magellanic Bridge  

E-Print Network [OSTI]

We describe medium-resolution spectroscopic observations taken with the ESO Multi-Mode Instrument in the CaII K line (3933.661 Angstroms) towards 7 QSOs located in the line-of-sight to the Magellanic Bridge. At a spectral resolution R = 6,000, five of the sightlines have a signal-to-noise ratio of 20 or higher. Definite Ca absorption due to Bridge material is detected towards 3 objects, with probable detection towards two other sightlines. Gas-phase CaII K Bridge and Milky Way abundances or lower limits for the all sightlines are estimated by the use of Parkes 21-cm HI emission line data. These data only have a spatial resolution of 14 arcminutes compared with the optical observations which have milli-arcsecond resolution. With this caveat, for the three objects with sound CaII K detections, we find that the ionic abundance of CaII K relative to HI, A=log(N(CaK)/N(HI)) for low-velocity Galactic gas ranges from -8.3 to -8.8 dex, with HI column densities varying from 3-6x10^20 cm^-2. For Magellanic Bridge gas, the values of A are 0.5 dex higher, ranging from -7.8 to -8.2 dex, with N(HI)=1-5x10^20 cm^-2. Higher values of A correspond to lower values of N(HI), although numbers are small. For the sightline towards B0251--675, the Bridge gas has two different velocities, and in only one of these is CaII K tentatively detected, perhaps indicating gas of a different origin or present-day characteristics (such as dust content), although this conclusion is uncertain and there is the possibility that one of the components could be related to the Magellanic Stream. Higher signal-to-noise CaII K data and higher resolution HI data are required to determine whether A changes with N(HI) over the Bridge and if the implied difference in the metalicity of the two Bridge components towards B0251-675 is real.

J. V. Smoker; F. P. Keenan; H. M. A. Thompson; C. Bruns; E. Muller; N. Lehner; J. -K. Lee; I. Hunter

2005-10-18T23:59:59.000Z

42

SILICON ABUNDANCES IN NEARBY STARS FROM THE Si I INFRARED LINES  

SciTech Connect (OSTI)

We have used high-resolution, high signal-to-noise ratio infrared spectra from the Subaru Telescope atop Mauna Kea. Line formation calculations of Si I infrared lines in the atmospheres of nearby stars are presented. All abundance results of [Si/Fe] are derived from local thermodynamic equilibrium (LTE) and NLTE statistical equilibrium calculations and spectrum synthesis methods. We found that NLTE effects for Si I infrared lines are important even for metal-rich stars (>0.1 dex), and the NLTE effects may depend on the surface gravities. A good agreement of silicon abundances between the optical and infrared lines is obtained when the NLTE effects are included, while a large difference is found for the LTE results. The derived silicon abundances are overabundant for metal-poor stars.

Shi, J. R.; Tan, K. F.; Zhao, G. [Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China); Takada-Hidai, M. [Liberal Arts Education Center, Tokai University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292 (Japan); Takeda, Y. [National Astronomical Observatory of Japan 2-21-1 Osawa, Mitaka, Tokyo 181-8588 (Japan); Hu, S. M.; Cao, C., E-mail: sjr@bao.ac.cn [Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Shandong University at Weihai 264209 (China)

2012-08-10T23:59:59.000Z

43

Oxygen abundances in metal-poor subgiants as determined from [O I], O I and OH lines  

E-Print Network [OSTI]

The debate on the oxygen abundances of metal-poor stars has its origin in contradictory results obtained using different abundance indicators. To achieve a better understanding of the problem we have acquired high quality spectra with the Ultraviolet and Visual Echelle Spectrograph at VLT, with a signal-to-noise of the order of 100 in the near ultraviolet and 500 in the optical and near infrared wavelength range. Three different oxygen abundance indicators, OH ultraviolet lines around 310.0 nm, the [OI] line at 630.03 nm and the OI lines at 777.1-5 nm were observed in the spectra of 13 metal-poor subgiants with -3.0Oxygen abundances were obtained from the analysis of these indicators which was carried out assuming local thermodynamic equilibrium and plane-parallel model atmospheres. Abundances derived from OI were corrected for departures from local thermodynamic equilibrium. Stellar parameters were computed using Teff-vs-color calibrations based on the infrared flux method and Balmer line profiles, Hipparcos parallaxes and FeII lines. [O/Fe] values derived from the forbidden line at 630.03 nm are consistent with an oxygen/iron ratio that varies linearly with [Fe/H] as [O/Fe]}=-0.09(+/-0.08)[Fe/H]+0.36(+/-0.15). Values based on the OI triplet are on average 0.19+/-0.22 dex(s.d.) higher than the values based on the forbidden line while the agreement between OH ultraviolet lines and the forbidden line is much better with a mean difference of the order of -0.09+/-0.25 dex(s.d.). In general, our results follow the same trend as previously published results with the exception of the ones based on OH ultraviolet lines. In that case our results lie below the values which gave rise to the oxygen abundance debate for metal-poor stars.

A. E. Garca Prez; M. Asplund; F. Primas; P. E. Nissen; B. Gustafsson

2005-12-12T23:59:59.000Z

44

UV-TO-FIR ANALYSIS OF SPITZER/IRAC SOURCES IN THE EXTENDED GROTH STRIP. II. PHOTOMETRIC REDSHIFTS, STELLAR MASSES, AND STAR FORMATION RATES  

SciTech Connect (OSTI)

Based on the ultraviolet to far-infrared photometry already compiled and presented in a companion paper (Paper I), we present a detailed spectral energy distribution (SED) analysis of nearly 80,000 IRAC 3.6 + 4.5 {mu}m selected galaxies in the Extended Groth Strip. We estimate photometric redshifts, stellar masses, and star formation rates (SFRs) separately for each galaxy in this large sample. The catalog includes 76,936 sources with [3.6] {<=} 23.75 (85% completeness level of the IRAC survey) over 0.48 deg{sup 2}. The typical photometric redshift accuracy is {Delta}z/(1 + z) = 0.034, with a catastrophic outlier fraction of just 2%. We quantify the systematics introduced by the use of different stellar population synthesis libraries and initial mass functions in the calculation of stellar masses. We find systematic offsets ranging from 0.1 to 0.4 dex, with a typical scatter of 0.3 dex. We also provide UV- and IR-based SFRs for all sample galaxies, based on several sets of dust emission templates and SFR indicators. We evaluate the systematic differences and goodness of the different SFR estimations using the deep FIDEL 70 {mu}m data available in the Extended Groth Strip. Typical random uncertainties of the IR-bases SFRs are a factor of two, with non-negligible systematic effects at z {approx}> 1.5 observed when only MIPS 24 {mu}m data are available. All data products (SEDs, postage stamps from imaging data, and different estimations of the photometric redshifts, stellar masses, and SFRs of each galaxy) described in this and the companion paper are publicly available, and they can be accessed through our the Web interface utility Rainbow-navigator.

Barro, G.; Perez-Gonzalez, P. G.; Gallego, J.; Villar, V.; Zamorano, J. [Departamento de Astrofisica, Facultad de CC. Fisicas, Universidad Complutense de Madrid, E-28040 Madrid (Spain); Ashby, M. L. N. [Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138 (United States); Kajisawa, M.; Yamada, T. [Astronomical Institute, Tohoku University, Aramaki, Aoba, Sendai 9808578 (Japan); Miyazaki, S. [National Astronomical Observatory of Japan, Mitaka, Tokyo 181-8588 (Japan)

2011-04-01T23:59:59.000Z

45

REPRODUCING THE OBSERVED ABUNDANCES IN RCB AND HdC STARS WITH POST-DOUBLE-DEGENERATE MERGER MODELS-CONSTRAINTS ON MERGER AND POST-MERGER SIMULATIONS AND PHYSICS PROCESSES  

SciTech Connect (OSTI)

The R Coronae Borealis (RCB) stars are hydrogen-deficient, variable stars that are most likely the result of He-CO WD mergers. They display extremely low oxygen isotopic ratios, {sup 16}O/{sup 18}O {approx_equal} 1-10, {sup 12}C/{sup 13}C {>=} 100, and enhancements up to 2.6 dex in F and in s-process elements from Zn to La, compared to solar. These abundances provide stringent constraints on the physical processes during and after the double-degenerate merger. As shown previously, O-isotopic ratios observed in RCB stars cannot result from the dynamic double-degenerate merger phase, and we now investigate the role of the long-term one-dimensional spherical post-merger evolution and nucleosynthesis based on realistic hydrodynamic merger progenitor models. We adopt a model for extra envelope mixing to represent processes driven by rotation originating in the dynamical merger. Comprehensive nucleosynthesis post-processing simulations for these stellar evolution models reproduce, for the first time, the full range of the observed abundances for almost all the elements measured in RCB stars: {sup 16}O/{sup 18}O ratios between 9 and 15, C-isotopic ratios above 100, and {approx}1.4-2.35 dex F enhancements, along with enrichments in s-process elements. The nucleosynthesis processes in our models constrain the length and temperature in the dynamic merger shell-of-fire feature as well as the envelope mixing in the post-merger phase. s-process elements originate either in the shell-of-fire merger feature or during the post-merger evolution, but the contribution from the asymptotic giant branch progenitors is negligible. The post-merger envelope mixing must eventually cease {approx}10{sup 6} yr after the dynamic merger phase before the star enters the RCB phase.

Menon, Athira; Herwig, Falk; Denissenkov, Pavel A. [Department of Physics and Astronomy, University of Victoria, Victoria, BC V8P5C2 (Canada); Clayton, Geoffrey C.; Staff, Jan [Department of Physics and Astronomy, Louisiana State University, 202 Nicholson Hall, Tower Dr., Baton Rouge, LA 70803-4001 (United States); Pignatari, Marco [Department of Physics, University of Basel, Klingelbergstrasse 82, CH-4056 Basel (Switzerland); Paxton, Bill [Kavli Institute for Theoretical Physics and Department of Physics, Kohn Hall, University of California, Santa Barbara, CA 93106 (United States)

2013-07-20T23:59:59.000Z

46

The usage of Stromgren photometry in studies of Local Group Dwarf Spheroidal Galaxies - Application to Draco: a new catalogue of Draco members and a study of the metallicity distribution function and radial gradients  

E-Print Network [OSTI]

In this paper we demonstrate how Stromgren uvby photometry can be efficiently used to: 1. Identify red giant branch stars that are members in a dwarf spheroidal galaxy. 2. Derive age-independent metallicities for the same stars and quantify the associated errors. Stromgren uvby photometry in a 11 x 22 arcmin field centered on the Draco dwarf spheroidal galaxy was obtained using the Isaac Newton Telescope on La Palma. Members of the Draco dSph galaxy were identified using the surface gravity sensitive c_1 index which discriminates between red giant and dwarf stars. Thus enabling us to distinguish the (red giant branch) members of the dwarf spheroidal galaxy from the foreground dwarf stars in our galaxy. The method is evaluated through a comparison of our membership list with membership classifications in the literature based on radial velocities and proper motions. The metallicity sensitive m_1 index was used to derive individual and age-independent metallicities for the members of the Draco dSph galaxy. The derived metallicities are compared to studies based on high resolution spectroscopy and the agreement is found to be very good. We present metallicities for 169 members of the red giant branch in the Draco dwarf spheroidal galaxy (the largest sample to date). The metallicity distribution function for the Draco dSph galaxy shows a mean [Fe/H] = -1.74 dex with a spread of 0.24 dex. The correlation between metallicity and colour for the stars on the red giant branch is consistent with a dominant old, and coeval population. There is a possible spatial population gradient over the field with the most metal-rich stars being more centrally concentrated than the metal-poor stars.

D. Faria; S. Feltzing; I. Lundstrom; G. Gilmore; G. M. Wahlgren; A. Ardeberg; P. Linde

2006-11-29T23:59:59.000Z

47

BWXTymes January 2007  

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

or ethnicity? Safeguards & Security Sentinel 5 BWXTymes S&S shares best practices in Russia A Christmas tree in Red Square. That's one sight that Dex- ter Beard of Safeguards and...

48

The Source of Airborne Lead: Recycling Pb-Contaminated Soils  

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

The Source of Airborne Lead: Recycling The Source of Airborne Lead: Recycling Pb-Contaminated Soils Starting in the 1970s, federal regulatory control and eventual elimination of lead-based "anti-knock" additives in gasoline decreased the level of airborne Pb in the USA by two orders-of-magnitude [1]. Blood lead levels of the USA figure 1 Figure 1. The good, the bad, and the ugly. Ambient airborne particulate matter captured on filters of woven silica fiber (large strips) and TeflonTM (round). Clean fiber filter at bottom for comparison. Take a deep breath? population decreased correspondingly [2,3]. Despite this dramatic improvement in both exposure risk and body burden of Pb, the sources and health threat of the low levels of lead in our "unleaded" air remain topics

49

PSADEFS.CHP:Corel VENTURA  

Gasoline and Diesel Fuel Update (EIA)

Definitions Definitions of Petroleum Products and Other Terms Alcohol. The family name of a group of organic chemical compounds composed of carbon, hydrogen, and oxygen. The series of molecules vary in chain length and are composed of a hydrocarbon plus a hydroxyl group; CH 3 - (CH 2 )n-OH (e.g., methanol, ethanol, and tertiary butyl alcohol). Alkylate. The product of an alkylation reaction. It usu- ally refers to the high octane product from alkylation units. This alkylate is used in blending high octane gaso- line. Alkylation. A refining process for chemically combining isobutane with olefin hydrocarbons (e.g., propylene, buty- lene) through the control of temperature and pressure in the presence of an acid catalyst, usually sulfuric acid or hydrofluoric acid. The product, alkylate, an isoparaffin, has high octane value and is blended with motor and aviation gasoline to improve the antiknock

50

Motor gasolines, summer 1979  

SciTech Connect (OSTI)

Analytical data for 2401 samples of motor gasoline, from service stations throughout the country, were collected and analyzed under agreement between the Bartlesville Energy Technology Center and the American Petroleum Institute. The samples represent the products of 48 companies, large and small, which manufacture and supply gasoline. These data are tabulated by groups according to brands (unlabeled) and grades for 17 marketing areas and districts into which the country is divided. A map included in this report, shows marketing areas, districts and sampling locations. The report also includes charts indicating the trends of selected properties of motor fuels since 1949. Twelve octane distribution percent charts for areas 1, 2, 3, and 4 for unleaded, regular, and premium grades of gasoline are presented in this report. The antiknock (octane) index ((R + M)/2) averages of gasoline sold in this country were 88.6, 89.3, and 93.7 unleaded, regular, and premium grades of gasolines, respectively.

Shelton, E.M.

1980-02-01T23:59:59.000Z

51

Aerosol Science and Technology, 41:202216, 2007 Copyright c American Association for Aerosol Research  

E-Print Network [OSTI]

processes, such as con- densation, coagulation, gas-to-particle conversion (Reid et al. 1998), and particle Aerosol size distribution is, along with particle refractive in- dex and shape, one of important

52

Application of a Proapoptotic Peptide to Intratumorally Spreading Cancer Therapy  

Science Journals Connector (OSTI)

...protein. Etoposide, a topoisomerase inhibitor that induces caspase-dependent apoptosis...in the presence of the cognate peptide inhibitors and controls. Unmodified dextran (Dex...transfection by histidine-modified chitosan through enhancement of endosomal escape...

Renwei Chen; Gary B. Braun; Xiuquan Luo; Kazuki N. Sugahara; Tambet Teesalu; and Erkki Ruoslahti

2013-02-15T23:59:59.000Z

53

Blended Straight-Run Gasolines with Composite Additives Containing Watery Ethanol  

Science Journals Connector (OSTI)

Cranking and antiknock properties of gasoline-alcohol blends based on straight-run gasoline with additives containing watery ethanol and other ... components are studied. The composition of the gasoline-alcohol b...

Yu. O. Beiko; A. P. Pavlovskii; O. A. Beiko

2014-01-01T23:59:59.000Z

54

Xenon in Mercury-Manganese Stars  

E-Print Network [OSTI]

Previous studies of elemental abundances in Mercury-Manganese (HgMn) stars have occasionally reported the presence of lines of the ionized rare noble gas Xe II, especially in a few of the hottest stars with Teff ~ 13000--15000 K. A new study of this element has been undertaken using observations from Lick Observatory's Hamilton Echelle Spectrograph. In this work, the spectrum synthesis program UCLSYN has been used to undertake abundance analysis assuming LTE. We find that in the Smith & Dworetsky sample of HgMn stars, Xe is vastly over-abundant in 21 of 22 HgMn stars studied, by factors of 3.1--4.8 dex. There does not appear to be a significant correlation of Xe abundance with Teff. A comparison sample of normal late B stars shows no sign of Xe II lines that could be detected, consistent with the expected weakness of lines at normal abundance. The main reason for the previous lack of widespread detection in HgMn stars is probably due to the strongest lines being at longer wavelengths than the photographic blue. The lines used in this work were 4603.03A, 4844.33A and 5292.22A.

M. M. Dworetsky; J. L. Persaud; K. Patel

2008-01-16T23:59:59.000Z

55

Ca isotopic anomaly in the atmospheres of Ap stars  

E-Print Network [OSTI]

We present results of the Ca stratification analysis in the atmospheres of 21 magnetic chemically peculiar (Ap) stars. This analysis was based on the spectral observations carried out with the UVES spectrograph attached to the 8-m VLT telescope. Ca was found to be strongly stratified in all stars with different effective temperatures and magnetic field strengths. This element is overabundant by 1-1.5 dex below logtau_5000~-1 and strongly depleted above logtau_5000=-1.5. Based on the overall Ca abundance distributions, we modelled a profile of the IR-triplet Ca II 8498 line. It shows a significant contribution of the heavy isotopes 46Ca and 48Ca, which represent less than 1% of the solar Ca isotopic mixture. In Ap stars with the relatively small surface magnetic fields (Ca isotope is concentrated close to the photosphere, while the heavy isotopes are pushed towards the outer layers. Isotopic separation disappears in the atmospheres of stars with magnetic fields above 6-7 kG. The observed overall Ca stratification and isotopic anomalies may be explained by a combined action of the radiatively-driven diffusion and the light-induced drift.

T. Ryabchikova; O. Kochukhov; S. Bagnulo

2007-03-13T23:59:59.000Z

56

Stellar substructures in the solar neighbourhood IV. Kinematic Group 1 in the Geneva-Copenhagen survey  

E-Print Network [OSTI]

We determine detailed elemental abundances in stars belonging to the so-called Group 1 of the Geneva-Copenhagen survey (GCS) and compare the chemical composition with the Galactic thin- and thick-disc stars, with the GCS Group 2 and Group 3 stars, as well as with several kinematic streams of similar metallicities. The aim is to search for chemical signatures that might give information about the formation history of this kinematic group of stars. High-resolution spectra were obtained with the Fibre-fed Echelle Spectrograph (FIES) spectrograph at the Nordic Optical Telescope, La Palma, and were analysed with a differential model atmosphere method. Comparison stars were observed and analysed with the same method. The average value of [Fe/H] for the 37 stars of Group 1 is -0.20 +- 0.14 dex. Investigated Group 1 stars can be separated into three age subgroups. Along with the main 8- and 12-Gyr-old populations, a subgroup of stars younger than 5 Gyr can be separated as well. Abundances of oxygen, alpha-elements, a...

enovien?, R; Nordstrm, B; Stonkut?, E; Barisevi?ius, G

2015-01-01T23:59:59.000Z

57

Oxygen abundance in the Sloan Digital Sky Survey  

E-Print Network [OSTI]

We present two samples of $\\hii$ galaxies from the Sloan Digital Sky Survey (SDSS) spectroscopic observations data release 3. The electron temperatures($T_e$) of 225 galaxies are calculated with the photoionized $\\hii$ model and $T_e$ of 3997 galaxies are calculated with an empirical method. The oxygen abundances from the $T_e$ methods of the two samples are determined reliably. The oxygen abundances from a strong line metallicity indicator, such as $R_{23}$, $P$, $N2$, and $O3N2$, are also calculated. We compared oxygen abundances of $\\hii$ galaxies obtained with the $T_e$ method, $R_{23}$ method, $P$ method, $N2$ method, and $O3N2$method. The oxygen abundances derived with the $T_e$ method are systematically lower by $\\sim$0.2 dex than those derived with the $R_{23}$ method, consistent with previous studies based on $\\hii$ region samples. No clear offset for oxygen abundance was found between $T_e$ metallicity and $P$, $N2$ and $O3N2$ metallicity. When we studied the relation between N/O and O/H, we found that in the metallicity regime of $\\zoh > 7.95$, the large scatter of the relation can be explained by the contribution of small mass stars to the production of nitrogen. In the high metallicity regime, $\\zoh > 8.2$, nitrogen is primarily a secondary element produced by stars of all masses.

F. Shi; X. Kong; F. Z. Cheng

2006-03-10T23:59:59.000Z

58

Oxygen abundances in G- and F-type stars from HARPS  

E-Print Network [OSTI]

We present a detailed and uniform study of oxygen abundance from two different oxygen lines at 6158$\\AA$ and 6300$\\AA$ in a large sample of solar-type stars. The results are used to check the behaviour of these spectral lines as oxygen abundance indicators and to study the evolution of oxygen in thick and thin disk populations of the Galaxy. Equivalent width measurements were carried out for the [OI]~6158$\\AA$ and OI~6300$\\AA$ lines. LTE abundances were obtained from these two lines in 610 and 535 stars, respectively. We were able to measure oxygen abundance from both indicators in 447 stars, enabling us, for the first time, to compare them in a uniform way. Careful error analysis has been performed. We found that oxygen abundances derived from the 6158$\\AA$ and 6300$\\AA$ lines agree to within 0.1dex in 58\\% of the stars in our sample, and this result improves for higher signal-to-noise values. We confirm an oxygen enhancement in stars of the thick disk, as has also been seen for other $\\alpha$-elements. The ...

de Lis, S Bertran; Adibekyan, V Zh; Santos, N C; Sousa, S G

2015-01-01T23:59:59.000Z

59

The iron abundance in hot central stars of planetary nebulae derived from IUE spectra  

E-Print Network [OSTI]

We present the first attempt to determine the iron abundance in hot central stars of planetary nebulae. We perform an analysis with fully metal-line blanketed NLTE model atmospheres for a sample of ten stars (T_eff >= 70.000 K) for which high-resolution UV spectra are available from the IUE archive. In all cases lines of Fe VI or Fe VII can be identified. As a general trend, the iron abundance appears to be subsolar by 0.5-1 dex, however, the S/N of the IUE spectra is not sufficient to exclude a solar abundance in any specific case. Improved spectroscopy by either FUSE or HST is necessary to verify the possibility of a general iron deficiency in central stars. The suspected deficiency may be the result of gravitational settling in the case of three high-gravity objects. For the other stars with low gravity and high luminosity dust fractionation during the previous AGB phase is a conceivable origin.

J. L. Deetjen; S. Dreizler; T. Rauch; K. Werner

2000-06-23T23:59:59.000Z

60

Fe and Al Abundances for 180 Red Giants in the Globular Cluster Omega Centauri (NGC 5139)  

E-Print Network [OSTI]

We present radial velocities, Fe, and Al abundances for 180 red giant branch (RGB) stars in the Galactic globular cluster Omega Centauri ($\\omega$ Cen). The majority of our data lie in the range 11.0$Al/Fe] ratios exhibit large star--to--star scatter for all populations, with the more than 1.0 dex range of [Al/Fe] decreasing for stars more metal--rich than [Fe/H]$\\sim$--1.4. The minimum [Al/Fe] abundance observed for all metallicity populations is [Al/Fe]$\\sim$+0.15. The maximum abundance of log $\\epsilon$(Al) is reached for stars with [Fe/H]$\\sim$--1.4 and does not increase further with stellar metallicity. We interpret these results as evidence for type II SNe providing the minimum [Al/Fe] ratio and a mass spectrum of intermediate mass asymptotic giant branch stars causing the majority of the [Al/Fe] scatter. These results seem to fit in the adopted scheme that star formation occurred in $\\omega$ Cen over $>$1 Gyr.

Christian I. Johnson; Catherine A. Pilachowski; Jennifer Simmerer; Dustin Schwenk

2008-04-16T23:59:59.000Z

Note: This page contains sample records for the topic "antiknock in dex" 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

Lithium and magnetic fields in giants. HD 232862 : a magnetic and lithium-rich giant star  

E-Print Network [OSTI]

We report the detection of an unusually high lithium content in HD 232862, a field giant classified as a G8II star, and hosting a magnetic field. With the spectropolarimeters ESPaDOnS at CFHT and NARVAL at TBL, we have collected high resolution and high signal-to-noise spectra of three giants : HD 232862, KU Peg and HD 21018. From spectral synthesis we have inferred stellar parameters and measured lithium abundances that we have compared to predictions from evolutionary models. We have also analysed Stokes V signatures, looking for a magnetic field on these giants. HD 232862, presents a very high abundance of lithium (ALi = 2.45 +/- 0.25 dex), far in excess of the theoretically value expected at this spectral type and for this luminosity class (i.e, G8II). The evolutionary stage of HD 232862 has been precised, and it suggests a mass in the lower part of the [1.0 Msun ; 3.5 Msun ] mass interval, likely 1.5 to 2.0 solar mass, at the bottom of the Red Giant Branch. Besides, a time variable Stokes V signature has...

Lbre, A; Nascimento, J D do; Konstantinova-Antova, R; Kolev, D; Aurire, M; De Laverny, P; De Medeiros, J R

2009-01-01T23:59:59.000Z

62

Insights from the Outskirts: Chemical and Dynamical Properties in the outer Parts of the Fornax Dwarf Spheroidal Galaxy  

E-Print Network [OSTI]

We present radial velocities and [Fe/H] abundances for 340 stars in the Fornax dwarf spheroidal from R~16,000 spectra. The targets have been obtained in the outer parts of the galaxy, a region which has been poorly studied before. Our sample shows a wide range in [Fe/H], between -0.5 and -3.0 dex, in which we detect three subgroups. Removal of stars belonging to the most metal-rich population produces a truncated metallicity distribution function that is identical to Sculptor, indicating that these systems have shared a similar early evolution, only that Fornax experienced a late, intense period of star formation (SF). The derived age-metallicity relation shows a fast increase in [Fe/H] at early ages, after which the enrichment flattens significantly for stars younger than ~8 Gyr. Additionally, the data indicate a strong population of stars around 4 Gyr, followed by a second rapid enrichment in [Fe/H]. A leaky-box chemical enrichment model generally matches the observed relation but does not predict a signifi...

Hendricks, Benjamin; Walker, Matthew; Johnson, Christian I; Penarrubia, Jorge; Gilmore, Gerard

2014-01-01T23:59:59.000Z

63

A New Definition for the Ca4227 Feature: Is Calcium Really Underabundant in Early-type Galaxies?  

E-Print Network [OSTI]

We have investigated the abundance of calcium in early-type galaxies by measuring the strength of the Ca I 4227 absorption line in their integrated spectra. The database used is the large sample of early-type galaxy integrated spectra in Caldwell, Rose, & Concannon (2003). We have measured Ca abundances from the Ca I 4227 feature both by using the Lick Ca4227 index and also by defining a new index, Ca4227_r, that avoids the CN4216 molecular band in the continuum on the blueward side of the line. With the new index definition we measure Ca abundances that are systematically ~0.3 dex higher than with the Lick Ca4227 index. The result is that with the new index definition we obtain higher [Ca/Fe] abundances in early-type galaxies which are more consistent with their well known [Mg/Fe] over-abundances. Hence, we suggest that Ca might be slightly enhanced, relative to Fe, in early-type galaxies.

L. C. Prochaska; James A. Rose; Ricardo P. Schiavon

2005-09-26T23:59:59.000Z

64

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

65

Neon Abundances in B-Stars of the Orion Association: Solving the Solar Model Problem?  

E-Print Network [OSTI]

We report on non-LTE Ne abundances for a sample of B-type stellar members of the Orion Association. The abundances were derived by means of non-LTE fully metal-blanketed model atmospheres and extensive model atoms with updated atomic data. We find that these young stars have a very homogeneous abundance of A(Ne) = 8.27 +/- 0.05. This abundance is higher by ~0.4 dex than currently adopted solar value, A(Ne)=7.84, which is derived from lines produced in the corona and active regions. The general agreement between the abundances of C, N, and O derived for B stars with the solar abundances of these elements derived from 3-D hydrodynamical models atmospheres strongly suggests that the abundance patterns of the light elements in the Sun and B stars are broadly similar. If this hypothesis is true, then the Ne abundance derived here is the same within the uncertainties as the value required to reconcile solar models with helioseismological observations.

Katia Cunha; Ivan Hubeny; Thierry Lanz

2006-06-29T23:59:59.000Z

66

Rare-earth elements in the atmosphere of the magnetic chemically peculiar star HD 144897. New classification of the Nd III spectrum  

E-Print Network [OSTI]

We have obtained a UVES spectrum of a slowly rotating strongly magnetic Ap star, HD 144897, that exhibits very large overabundances of rare-earth elements. Here we present a detailed spectral analysis of this object, also taking into account effects of non-uniform vertical distribution (stratification) of chemical elements. We have determined the photospheric abundances of 40 ions. For seven elements (Mg, Si, Ca, Ti, Cr, Mn, Fe), we have obtained a stratification model that allow us to produce a satisfactory fit to the observed profiles of spectral lines of various strength. REEs abundances, that for the first time in the literature have been determined from the lines of the first and second ions, have been found typically four dex larger than solar abundances. Our analysis of REE spectral lines provide a strong support to the laboratory line classification and determination of the atomic parameters. The only remarkable exception is Nd III, for which spectral synthesis was found to be inconsistent with the ob...

Ryabchikova, T A; Kochukhov, O; Ryabtsov, A V

2006-01-01T23:59:59.000Z

67

CHARACTERIZING TRANSITION TEMPERATURE GAS IN THE GALACTIC CORONA  

SciTech Connect (OSTI)

We present a study of the properties of the transition temperature (T {approx} 10{sup 5} K) gas in the Milky Way corona, based on the measurements of O VI, N V, C IV, Si IV, and Fe III absorption lines seen in the far-ultraviolet spectra of 58 sight lines to extragalactic targets, obtained with the Far-Ultraviolet Spectroscopic Explorer and the Space Telescope Imaging Spectrograph. In many sight lines the Galactic absorption profiles show multiple components, which are analyzed separately. We find that the highly ionized atoms are distributed irregularly in a layer with a scale height of about 3 kpc, which rotates along with the gas in the disk, without an obvious gradient in the rotation velocity away from the Galactic plane. Within this layer the gas has randomly oriented velocities with a dispersion of 40-60 km s{sup -1}. On average the integrated column densities are log N(O VI) = 14.3, log N(N V) = 13.5, log N(C IV) = 14.2, log N(Si IV) = 13.6, and log N(Fe III) = 14.2, with a dispersion of just 0.2 dex in each case. In sight lines around the Galactic center and Galactic north pole, all column densities are enhanced by a factor {approx}2, while at intermediate latitudes in the southern sky there is a deficit in N(O VI) of about a factor of two, but no deficit for the other ions. We compare the column densities and ionic ratios to a series of theoretical predictions: collisional ionization equilibrium, shock ionization, conductive interfaces, turbulent mixing, thick disk supernovae, static non-equilibrium ionization (NIE) radiative cooling, and an NIE radiative cooling model in which the gas flows through the cooling zone. None of these models can fully reproduce the data, but it is clear that NIE radiative cooling is important in generating the transition temperature gas.

Wakker, Bart P.; Savage, Blair D. [Department of Astronomy, University of Wisconsin, Madison, WI 53706 (United States); Fox, Andrew J. [European Southern Observatory, Alonso de Cordova 3107, Casilla 19001, Vitacura, Santiago (Chile); Benjamin, Robert A. [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore MD 21218 (United States); Shapiro, Paul R., E-mail: wakker@astro.wisc.edu, E-mail: savage@astro.wisc.edu, E-mail: afox@stsci.edu, E-mail: benjamir@uww.edu, E-mail: shapiro@astro.as.utexas.edu [University of Texas at Austin, Department of Astronomy, Austin, TX 78712 (United States)

2012-04-20T23:59:59.000Z

68

Experimental Investigation of Spark-Ignited Combustion with High-Octane Biofuels and EGR. 2. Fuel and EGR Effects on Knock-Limited Load and Speed  

SciTech Connect (OSTI)

The present study experimentally investigates spark-ignited combustion with 87 AKI E0 gasoline in its neat form and in midlevel alcohol gasoline blends with 24% vol/vol isobutanol gasoline (IB24) and 30% vol/vol ethanol gasoline (E30). A single-cylinder research engine is used with an 11.85:1 compression ratio, hydraulically actuated valves, laboratory intake air, and was capable of external exhaust gas recirculation (EGR). Experiments were conducted with all fuels to full-load conditions with = 1, using both 0% and 15% external-cooled EGR. Higher octane number biofuel blends exhibited increased stoichiometric torque capability at this compression ratio, where the unique properties of ethanol enabled a doubling of the stoichiometric torque capability with E30 as compared to that of 87AKI, up to 20 bar IMEPg (indicating mean effective pressure gross) at = 1. The results demonstrate that for all fuels, EGR is a key enabler for increasing engine efficiency but is less useful for knock mitigation with E30 than for 87AKI gasoline or IB24. Under knocking conditions, 15% EGR is found to offer 1 CA of CA50 timing advance with E30, whereas up to 5 CA of CA50 advance is possible with knock-limited 87AKI gasoline. Compared to 87AKI, both E30 and IB24 are found to have reduced adiabatic flame temperature and shorter combustion durations, which reduce knocking propensity beyond that indicated by the octane number. However, E30+0% EGR is found to exhibit the better antiknock properties than either 87AKI+15% EGR or IB24+15% EGR, expanding the knock limited operating range and engine stoichiometric torque capability at high compression ratio. Furthermore, the fuel sensitivity (S) of E30 was attributed to reduced speed sensitivity of E30, expanding the low-speed stoichiometric torque capability at high compression ratio. The results illustrate that intermediate alcohol gasoline blends exhibit exceptional antiknock properties and performance beyond that indicated by the octane number tests, particularly E30.

Splitter, Derek A [ORNL] [ORNL; Szybist, James P [ORNL] [ORNL

2013-01-01T23:59:59.000Z

69

Binary Contamination in the SEGUE Sample: Effects on SSPP Determinations of Stellar Atmospheric Parameters  

Science Journals Connector (OSTI)

We examine the effects that unresolved binaries have on the determination of various stellar atmospheric parameters for targets from the Sloan Extension for Galactic Understanding and Exploration (SEGUE) using numerical modeling, a grid of synthetic spectra, and the SEGUE Stellar Parameter Pipeline (SSPP). The SEGUE survey, a component of the Sloan Digital Sky Survey-II (SDSS-II) project focusing on Galactic structure, provides medium resolution spectroscopy for over 200,000 stars of various spectral types over a large area on the sky. To model undetected binaries that may be in this sample, we use a variety of mass distributions for the primary and secondary stars in conjunction with empirically determined relationships for orbital parameters to determine the fraction of G - K dwarf stars, defined by SDSS color cuts as having 0.48 ? (g r)0 ? 0.75, that will be blended with a secondary companion. We focus on the G-K dwarf sample in SEGUE as it records the history of chemical enrichment in our galaxy. To determine the effect of the secondary on the spectroscopic parameters, specifically effective temperature, surface gravity, metallicity, and [?/Fe], we synthesize a grid of model spectra from 3275 to 7850 K and [Fe/H] = 0.5 to 2.5 from MARCS model atmospheres using TurboSpectrum. These temperature and metallicity ranges roughly correspond to a stellar mass range of 0.1-1.0 M ?. We assume that both stars in the pair have the same metallicity. We analyze both "infinite" signal-to-noise ratio (S/N) models and degraded versions of the spectra, at median S/N of 50, 25, and 10. By running individual and combined spectra (representing the binaries) through the SSPP, we determine that ~10% of the blended G - K dwarf pairs with S/N ? 25 will have their atmospheric parameter determinations, in particular temperature and metallicity, noticeably affected by the presence of an undetected secondary; namely, they will be shifted beyond the expected SSPP uncertainties. Shifts in [Fe/H] largely result from the shifts in temperature caused by a secondary. The additional uncertainty from binarity in targets with S/N ? 25 is ~80 K in temperature and ~0.1 dex in [Fe/H]. The effect on surface gravity and [?/Fe] is even smaller. As the S/N of targets decreases, the uncertainties from undetected secondaries increase. For S/N = 10, 40% of the G-K dwarf sample is shifted beyond expected uncertainties for this S/N in effective temperature and/or metallicity. To account for the additional uncertainty from binary contamination at an S/N ~ 10, the most extreme scenario, uncertainties of ~140 K and ~0.17 dex in [Fe/H] must be added in quadrature to the published uncertainties of the SSPP.

Katharine J. Schlesinger; Jennifer A. Johnson; Young Sun Lee; Thomas Masseron; Brian Yanny; Constance M. Rockosi; B. Scott Gaudi; Timothy C. Beers

2010-01-01T23:59:59.000Z

70

Sensitivity of low degree oscillations to the change in solar abundances  

E-Print Network [OSTI]

Context. The most recent determination of the solar chemical composition, using a time-dependent, 3D hydrodynamical model of the solar atmosphere, exhibits a significant decrease of C, N, O abundances compared to their previous values. Solar models that use these new abundances are not consistent with helioseismological determinations of the sound speed profile, the surface helium abundance and the convection zone depth. Aims. We investigate the effect of changes of solar abundances on low degree p-mode and g-mode characteristics which are strong constraints of the solar core. We consider particularly the increase of neon abundance in the new solar mixture in order to reduce the discrepancy between models using new abundances and helioseismology. Methods. The observational determinations of solar frequencies from the GOLF instrument are used to test solar models computed with different chemical compositions. We consider in particular the normalized small frequency spacings in the low degree p-mode frequency range. Results. Low-degree small frequency spacings are very sensitive to changes in the heavy-element abundances, notably neon. We show that by considering all the seismic constraints, including the small frequency spacings, a rather large increase of neon abundance by about (0.5 +/- 0.05)dex can be a good solution to the discrepancy between solar models that use new abundances and low degree helioseismology, subject to adjusting slightly the solar age and the highest abundances. We also show that the change in solar abundances, notably neon, considerably affects g-mode frequencies, with relative frequency differences between the old and the new models higher than 1.5%

A. Zaatri; J. Provost; G. Berthomieu; P. Morel; T. Corbard

2007-04-18T23:59:59.000Z

71

THE CONNECTION BETWEEN GALAXIES AND DARK MATTER STRUCTURES IN THE LOCAL UNIVERSE  

SciTech Connect (OSTI)

We provide new constraints on the connection between galaxies in the local universe, identified by the Sloan Digital Sky Survey, and dark matter halos and their constituent substructures in the {Lambda}-cold dark matter model using WMAP7 cosmological parameters. Predictions for the abundance and clustering properties of dark matter halos, and the relationship between dark matter hosts and substructures, are based on a high-resolution cosmological simulation, the Bolshoi simulation. We associate galaxies with dark matter halos and subhalos using subhalo abundance matching, and perform a comprehensive analysis which investigates the underlying assumptions of this technique including (1) which halo property is most closely associated with galaxy stellar masses and luminosities, (2) how much scatter is in this relationship, and (3) how much subhalos can be stripped before their galaxies are destroyed. The models are jointly constrained by new measurements of the projected two-point galaxy clustering and the observed conditional stellar mass function of galaxies in groups. We find that an abundance matching model that associates galaxies with the peak circular velocity of their halos is in good agreement with the data, when scatter of 0.20 {+-} 0.03 dex in stellar mass at a given peak velocity is included. This confirms the theoretical expectation that the stellar mass of galaxies is tightly correlated with the potential wells of their dark matter halos before they are impacted by larger structures. The data put tight constraints on the satellite fraction of galaxies as a function of galaxy stellar mass and on the scatter between halo and galaxy properties, and rule out several alternative abundance matching models that have been considered. This will yield important constraints for galaxy formation models, and also provides encouraging indications that the galaxy-halo connection can be modeled with sufficient fidelity for future precision studies of the dark universe.

Reddick, Rachel M.; Wechsler, Risa H.; Behroozi, Peter S. [Kavli Institute for Particle Astrophysics and Cosmology, Physics Department, Stanford University, Stanford, CA 94305 (United States); Tinker, Jeremy L., E-mail: rmredd@stanford.edu, E-mail: rwechsler@stanford.edu [Physics Department, New York University, New York, NY 10003 (United States)

2013-07-01T23:59:59.000Z

72

A&A manuscript no. (will be inserted by hand later)  

E-Print Network [OSTI]

, Ontario, N6A 3K7 Canada 3 Center of Excellence in Information Systems, Tennessee State University abundances of ?? And are found to agree with those of Arcturus within 0.1 dex. In particular, oxygen and light requests to: J.­F. Donati (French address) is thus very similar to Arcturus though somewhat less evolved

Donati, Jean-François

73

The iron abundance of the Magellanic Bridge  

E-Print Network [OSTI]

High-resolution HST ultra-violet spectra for five B-type stars in the Magellanic Bridge and in the Large and Small Magellanic Clouds have been analysed to estimate their iron abundances. Those for the Clouds are lower than estimates obtained from late-type stars or the optical lines in B-type stars by approximately 0.5 dex. This may be due to systematic errors possibly arising from non-LTE effects or from errors in the atomic data as similar low Fe abundances having previously been reported from the analysis of the ultra-violet spectra of Galactic early-type stars. The iron abundance estimates for all three Bridge targets appear to be significantly lower than those found for the SMC and LMC by approximately -0.5 dex and -0.8 dex respectively and these differential results should not be affected by any systematic errors present in the absolute abundance estimates. These differential iron abundance estimates are consistent with the underabundances for C, N, O, Mg and Si of approximately -1.1 dex relative to our Galaxy previously found in our Bridge targets. The implications of these very low metal abundances for the Magellanic Bridge are discussed in terms of metal deficient material being stripped from the SMC.

P. L. Dufton; R. S. I. Ryans; H. M. A. Thompson; R. A. Street

2008-02-01T23:59:59.000Z

74

New UOP catalysts plus revamps to meet your octane goals  

SciTech Connect (OSTI)

It appears that the use of lead antiknocks will be completely banned by Congress in the near future. The lead ''phasedown'' threatens to become a lead ''crashdown.'' Light straight run and natural gasoline will require catalytic upgrading, in most refineries, to permit inclusion in the gasoline pool. The UOP Penex process is well-suited to regain much of the octane shortfall through isomerization of C/sub 5//C/sub 6/ normal paraffins in converted units as well as new unit applications. New Penex catalysts, I-8 and I-7, permit state-of-the-art processing capability. For conversions, UOP offers new catalysts capable of yielding, on a once-through basis, an 83-84 RONO Penexate at modest expenditure or, alternatively, a 78-80 RONO product with minimal revamp cost. UOP computer-assisted engineering studies can quickly identify and evaluate the process options available for a given project, so that revamp feasibility can be quickly assessed. This is important in the present climate where regulatory changes must be matched by a timely response from industry. Our studies have consistently shown that there is strong economic justification for addition of Penex isomerization to the refinery flow scheme, whether through new unit design or revamp conversions.

Krueding, A.P.; Johnson, J.A.; Pappas, S.W.

1985-03-01T23:59:59.000Z

75

Motor gasolines, winter 1979-1980  

SciTech Connect (OSTI)

Analytical data for 1857 samples of motor gasoline, were collected from service stations throughout the country and were analyzed in the laboratories of various refiners, motor manufacturers, and chemical companies. The data were submitted to the Bartlesville Energy Technology Center for study, necessary calculations, and compilation under a cooperative agreement between the Bartlesville Energy Technology Center (BETC) and the American Petroleum Institute (API). The samples represent the products of 48 companies, large and small, which manufacture and supply gasoline. These data are tabulated by groups according to brands (unlabeled) and grades for 17 marketing districts into which the country is divided. A map included in this report shows marketing areas districts and sampling locations. The report also includes charts indicating the trends of selected properties of motor fuels since 1949. Twelve octane distribution percent charts for areas, 1, 2, 3, and 4 for unleaded, regular, and premium grades of gasoline are presented in this report. The antiknock (octane) index ((R+M)/2) averages of gasoline sold in this country were 87.9, 92.1, 89.0, and 93.3 unleaded below 90.0, unleaded 90.0 and above, regular, and premium grades of gasolines, respectively.

Shelton, E.M.

1980-07-01T23:59:59.000Z

76

Use of ethers as high-octane components of gasolines  

SciTech Connect (OSTI)

This article reports on a study of the possible utilization of methyl tert-amyl ether (MTAE) as an automotive gasoline component, both by itself and in combination with methyl tert-butyl ether (MTBE). The naphtha used in these studies consisted of 80% reformer naphtha produced under severe conditions and 20% straight-run IBP-62/sup 0/C cut. The physicochemical properties of the MTAE, the MTBE, and the naphtha base stock are given. It is determined that MTAE, which has a slightly poorer knock resistance than MTBE, is fully equal to MTBE in all other respects and can be used as an automotive gasoline component; that a gasoline blend prepared from 89% naphtha base stock, 5.5% MTAE, and 5.5% MTBE meets all of the requirements of the standard GOST 2084-77 for Grade AI-93 gasoline; and that the use of MTAE offers a means for expanding the resources of high-octane components, lowering the toxicity of the gasolines and the exhaust gas (in comparison with organometallic antiknock agents), and bringing non-petroleum raw materials into the fuel production picture.

Gureev, A.A.; Baranova, G.N.; Korotkov, I.V.; Levinson, G.I.

1984-01-01T23:59:59.000Z

77

AHAM: A Dexterbased Reference Model for Adaptive Paul De Bra \\Lambda , GeertJan Houben y and Hongjing Wu  

E-Print Network [OSTI]

AHAM: A Dexter­based Reference Model for Adaptive Hypermedia Paul De Bra \\Lambda , Geert­Jan Houben, called AHAM, which encompasses most features supported by adaptive systems that exist today in order to be able to explain AHAM rather than formally specify it. AHAM augments Dex­ ter with features

De Bra, Paul

78

Adaptation and Search: from Dexter and AHAM to GAF Evgeny Knutov  

E-Print Network [OSTI]

Adaptation and Search: from Dexter and AHAM to GAF Evgeny Knutov Dep. of Computer Science Eindhoven, Human Factors 1. INTRODUCTION Since the most cited Adaptive Hypermedia (AH) model AHAM [1] (in 1999) new the evolution of Hypertext/Hypermedia modelling from Dex- ter Model through AHAM to the proposed GAF (Generic

De Bra, Paul

79

The first a observations of three globular clusters  

Science Journals Connector (OSTI)

......parameter of convective energy transport theory (Ferraro...enhanced compared to the solar value, or about 100-times...able to detect them in an economical and efficient way by comparing...elements of up to three times solar, or 2 dex compared to......

E. Paunzen; I. Kh. Iliev; O. I. Pintado; H. Baum; H. M. Maitzen; M. Netopil; A. nehag; M. Zejda; L. Fraga

2014-01-01T23:59:59.000Z

80

The Resolved Stellar Populations of a Dwarf Spheroidal Galaxy in the Virgo Cluster  

E-Print Network [OSTI]

We report on the discovery of a faint (M_V ~ -10.6 +/- 0.2) dwarf spheroidal galaxy on deep F606W and F814W Hubble Space Telescope images of a Virgo intracluster field. The galaxy is easily resolved in our images, as our color magnitude diagram (CMD) extends > 1 magnitude beyond the tip of the red giant branch (RGB). Thus, it is the deepest CMD for a small dwarf galaxy inside a cluster environment. Using the colors of the RGB stars, we derive a metal abundance for the dwarf of [M/H]= -2.3 +/- 0.3, and show that the metallicity dispersion is less than 0.6 dex at 95% confidence. We also use the galaxy's lack of AGB stars and the absence of objects brighter than M_bol ~ -4.1 +/- 0.2 to show that the system is old (t >~10 Gyr). Finally, we derive the object's structural parameters, and show that the galaxy displays no obvious evidence of tidal threshing. Since the tip of the red giant branch distance ((m-M)_0 = 31.23 +/- 0.17 or D = 17.6 +/- 1.4 Mpc) puts the galaxy near the core of the Virgo cluster, one might expect the object to have undergone some tidal processing. Yet the chemical and morphological similarity between the dwarf and the dSph galaxies of the Local and M81 Group demonstrates that the object is indeed pristine, and not the shredded remains of a much larger galaxy. We discuss the possible origins of this galaxy, and suggest that it is just now falling into Virgo for the first time.

Patrick R. Durrell; Benjamin F. Williams; Robin Ciardullo; John J. Feldmeier; Ted von Hippel; Steinn Sigurdsson; George H. Jacoby; Henry C. Ferguson; Nial R. Tanvir; Magda Arnaboldi; Ortwin Gerhard; J. Alfonso L. Aguerri; Ken Freeman; Matt Vinciguerra

2006-11-06T23:59:59.000Z

Note: This page contains sample records for the topic "antiknock in dex" 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

Stellar Kinematics in the Complicated Inner Spheroid of M31: Discovery of Substructure Along the Southeastern Minor Axis and its Relationship to the Giant Southern Stream  

E-Print Network [OSTI]

We present the discovery of a kinematically-cold stellar population along the SE minor axis of the Andromeda galaxy (M31) that is likely the forward continuation of M31's giant southern stream. This discovery was made in the course of an on-going spectroscopic survey of red giant branch (RGB) stars in M31 using the DEIMOS instrument on the Keck II 10-m telescope. Stellar kinematics are investigated in eight fields located 9-30 kpc from M31's center (in projection). A likelihood method based on photometric and spectroscopic diagnostics is used to isolate confirmed M31 RGB stars from foreground Milky Way dwarf stars: for the first time, this is done without using radial velocity as a selection criterion, allowing an unbiased study of M31's stellar kinematics. The radial velocity distribution of the 1013 M31 RGB stars shows evidence for the presence of two components. The broad (hot) component has a velocity dispersion of 129 km/s and presumably represents M31's virialized spheroid. A significant fraction (19%) of the population is in a narrow (cold) component centered near M31's systemic velocity with a velocity dispersion that decreases with increasing radial distance, from 55.5 km/s at R_proj=12 kpc to 10.6 km/s at R_proj=18 kpc. The spatial and velocity distribution of the cold component matches that of the "Southeast shelf" predicted by the Fardal et al. (2007) orbital model of the progenitor of the giant southern stream. The metallicity distribution of the cold component matches that of the giant southern stream, but is about 0.2 dex more metal rich on average than that of the hot spheroidal component. We discuss the implications of our discovery on the interpretation of the intermediate-age spheroid population found in this region in recent ultra-deep HST imaging studies.

Karoline M. Gilbert; Mark Fardal; Jasonjot S. Kalirai; Puragra Guhathakurta; Marla C. Geha; Jedidah Isler; Steven R. Majewski; James C. Ostheimer; Richard J. Patterson; David B. Reitzel; Evan Kirby; Michael C. Cooper

2007-03-01T23:59:59.000Z

82

IDENTIFICATION OF A NEW RELATIVELY OLD STAR CLUSTER IN THE SMALL MAGELLANIC CLOUD  

SciTech Connect (OSTI)

We present results on the age and metallicity estimates of the astonishingly unstudied Small Magellanic Cloud (SMC) cluster (ESO 51-SC09), from CCD BVI photometry obtained at the ESO NTT with the EMMI attached. ESO 51-SC09 turns out to be a relatively small cluster (FWHM = 10 {+-} 1 pc) located {approx}4 Degree-Sign northward from the galaxy center. We report for the first time a mean cluster age of 7.0 {+-} 1.3 Gyr and a mean cluster metallicity of [Fe/H] = -1.00 {+-} 0.15 dex, concluding that ESO 51-SC09 belongs to the group of the oldest SMC clusters. We found that the cluster is projected onto an older (age {approx}10-13 Gyr) and more metal-poor ([Fe/H] = -1.3 {+-} 0.2 dex) dominant field stellar population, so that the cluster could have reached its current location because of its orbital motion.

Piatti, Andres E., E-mail: andres@iafe.uba.ar [Instituto de Astronomia y Fisica del Espacio, CC 67, Suc. 28, 1428 Ciudad de Buenos Aires (Argentina)

2012-09-10T23:59:59.000Z

83

Automotive fuels. January 1984-February 1992 (Citations from the NTIS Data Base). Rept. for Jan 84-Feb 92  

SciTech Connect (OSTI)

The bibliography contains citations concerning various fuels for the operation of automobiles. Fuels include alcohol, diesel, gasoline, hydrogen, natural gas, methanol, and methane. Topics include exhaust emissions and gases, economy, consumption, antiknock additives, and volatility. (Contains 153 citations with title list and subject index.)

Not Available

1992-01-01T23:59:59.000Z

84

Conserved Structural and Functional Control of N-Methyl-D-aspartate Receptor Gating by Transmembrane Domain M3*  

E-Print Network [OSTI]

to pore block by ( )MK-801, ( )MK-801, ketamine, memantine, amantadine, and dex- trorphan. The partial

Traynelis, Stephen F.

85

Parallel In Situ Indexing for Data-intensive Computing  

SciTech Connect (OSTI)

As computing power increases exponentially, vast amount of data is created by many scientific re- search activities. However, the bandwidth for storing the data to disks and reading the data from disks has been improving at a much slower pace. These two trends produce an ever-widening data access gap. Our work brings together two distinct technologies to address this data access issue: indexing and in situ processing. From decades of database research literature, we know that indexing is an effective way to address the data access issue, particularly for accessing relatively small fraction of data records. As data sets increase in sizes, more and more analysts need to use selective data access, which makes indexing an even more important for improving data access. The challenge is that most implementations of in- dexing technology are embedded in large database management systems (DBMS), but most scientific datasets are not managed by any DBMS. In this work, we choose to include indexes with the scientific data instead of requiring the data to be loaded into a DBMS. We use compressed bitmap indexes from the FastBit software which are known to be highly effective for query-intensive workloads common to scientific data analysis. To use the indexes, we need to build them first. The index building procedure needs to access the whole data set and may also require a significant amount of compute time. In this work, we adapt the in situ processing technology to generate the indexes, thus removing the need of read- ing data from disks and to build indexes in parallel. The in situ data processing system used is ADIOS, a middleware for high-performance I/O. Our experimental results show that the indexes can improve the data access time up to 200 times depending on the fraction of data selected, and using in situ data processing system can effectively reduce the time needed to create the indexes, up to 10 times with our in situ technique when using identical parallel settings.

Kim, Jinoh; Abbasi, Hasan; Chacon, Luis; Docan, Ciprian; Klasky, Scott; Liu, Qing; Podhorszki, Norbert; Shoshani, Arie; Wu, Kesheng

2011-09-09T23:59:59.000Z

86

1, vol.97, no.5, pp.353358, 2014. Big Data Analysis by Density Ratio Estimation  

E-Print Network [OSTI]

}nde j=1 r (x) = p nu(x) p de(x) `nu' `de' (numerator) (denominator) {xnu i }nnu i=1 p nu(x) {xde j }nde j=1 p de(x) r (x) = p nu(x)/p de(x) 1 p nu(x) p de(x) r (x) = p nu(x)/p de(x) [1] 2.1 p nu(x) p de') p(y = `nu') p (y = `nu'|x) p(y = `de'|x) p (y) p (y|x) {xnu i }nnu i=1 {xde j }nde j=1 p(y|x) r(x) r

Sugiyama, Masashi

87

Ultrananocrystalline diamond thin films functionalized with therapeutically active collagen networks.  

SciTech Connect (OSTI)

The fabrication of biologically amenable interfaces in medicine bridges translational technologies with their surrounding biological environment. Functionalized nanomaterials catalyze this coalescence through the creation of biomimetic and active substrates upon which a spectrum of therapeutic elements can be delivered to adherent cells to address biomolecular processes in cancer, inflammation, etc. Here, we demonstrate the robust functionalization of ultrananocrystalline diamond (UNCD) with type I collagen and dexamethasone (Dex), an anti-inflammatory drug, to fabricate a hybrid therapeutically active substrate for localized drug delivery. UNCD oxidation coupled with a pH-mediated collagen adsorption process generated a comprehensive interface between the two materials, and subsequent Dex integration, activity, and elution were confirmed through inflammatory gene expression assays. These studies confer a translational relevance to the biofunctionalized UNCD in its role as an active therapeutic network for potent regulation of cellular activity toward applications in nanomedicine.

Huang, H.; Chen, M.; Bruno, P.; Lam, R.; Robinson, E.; Gruen, D.; Ho, D.; Materials Science Division; Northwestern Univ.

2009-01-01T23:59:59.000Z

88

MULTI-WAVELENGTH VIEW OF KILOPARSEC-SCALE CLUMPS IN STAR-FORMING GALAXIES AT z {approx} 2  

SciTech Connect (OSTI)

This paper studies the properties of kiloparsec-scale clumps in star-forming galaxies at z {approx} 2 through multi-wavelength broadband photometry. A sample of 40 clumps is identified from Hubble Space Telescope (HST)/Advanced Camera for Surveys (ACS) z-band images through auto-detection and visual inspection from 10 galaxies with 1.5 < z < 2.5 in the Hubble Ultra Deep Field, where deep and high-resolution HST/WFC3 and ACS images enable us to resolve structures of z {approx} 2 galaxies down to the kiloparsec scale in the rest-frame UV and optical bands and to detect clumps toward the faint end. The physical properties of clumps are measured through fitting spatially resolved seven-band (BVizYJH) spectral energy distribution to models. On average, the clumps are blue and have similar median rest-frame UV-optical color as the diffuse components of their host galaxies, but the clumps have large scatter in their colors. Although the star formation rate (SFR)-stellar mass relation of galaxies is dominated by the diffuse components, clumps emerge as regions with enhanced specific star formation rates, contributing individually {approx}10% and together {approx}50% of the SFR of the host galaxies. However, the contributions of clumps to the rest-frame UV/optical luminosity and stellar mass are smaller, typically a few percent individually and {approx}20% together. On average, clumps are younger by 0.2 dex and denser by a factor of eight than diffuse components. Clump properties have obvious radial variations in the sense that central clumps are redder, older, more extincted, denser, and less active on forming stars than outskirt clumps. Our results are broadly consistent with a widely held view that clumps are formed through gravitational instability in gas-rich turbulent disks and would eventually migrate toward galactic centers and coalesce into bulges. Roughly 40% of the galaxies in our sample contain a massive clump that could be identified as a proto-bulge, which seems qualitatively consistent with such a bulge-formation scenario.

Guo Yicheng; Giavalisco, Mauro; Cassata, Paolo [Astronomy Department, University of Massachusetts, 710 N. Pleasant St., Amherst, MA 01003 (United States); Ferguson, Henry C.; Koekemoer, Anton M., E-mail: yicheng@astro.umass.edu [Space Telescope Science Institute, 3700 San Martin Dr., Baltimore, MD 21218 (United States)

2012-10-01T23:59:59.000Z

89

Novel Characterization of GDI Engine Exhaust for Gasoline and Mid-Level Gasoline-Alcohol Blends  

SciTech Connect (OSTI)

Gasoline direct injection (GDI) engines can offer improved fuel economy and higher performance over their port fuel-injected (PFI) counterparts, and are now appearing in increasingly more U.S. and European vehicles. Small displacement, turbocharged GDI engines are replacing large displacement engines, particularly in light-duty trucks and sport utility vehicles, in order for manufacturers to meet more stringent fuel economy standards. GDI engines typically emit the most particulate matter (PM) during periods of rich operation such as start-up and acceleration, and emissions of air toxics are also more likely during this condition. A 2.0 L GDI engine was operated at lambda of 0.91 at typical loads for acceleration (2600 rpm, 8 bar BMEP) on three different fuels; an 87 anti-knock index (AKI) gasoline (E0), 30% ethanol blended with the 87 AKI fuel (E30), and 48% isobutanol blended with the 87 AKI fuel. E30 was chosen to maximize octane enhancement while minimizing ethanol-blend level and iBu48 was chosen to match the same fuel oxygen level as E30. Particle size and number, organic carbon and elemental carbon (OC/EC), soot HC speciation, and aldehydes and ketones were all analyzed during the experiment. A new method for soot HC speciation is introduced using a direct, thermal desorption/pyrolysis inlet for the gas chromatograph (GC). Results showed high levels of aromatic compounds were present in the PM, including downstream of the catalyst, and the aldehydes were dominated by the alcohol blending.

Storey, John Morse [ORNL] [ORNL; Lewis Sr, Samuel Arthur [ORNL] [ORNL; Szybist, James P [ORNL] [ORNL; Thomas, John F [ORNL] [ORNL; Barone, Teresa L [ORNL] [ORNL; Eibl, Mary A [ORNL] [ORNL; Nafziger, Eric J [ORNL] [ORNL; Kaul, Brian C [ORNL] [ORNL

2014-01-01T23:59:59.000Z

90

Another forbidden solar oxygen abundance: the [O I] 5577 A line  

E-Print Network [OSTI]

Context: Recent works with improved model atmospheres, line formation, atomic and molecular data, and detailed treatment of blends, have resulted in a significant downward revision of the solar oxygen abundance. Aims: Considering the importance of the Sun as an astrophysical standard and the current conflict of standard solar models using the new solar abundances with helioseismological observations we have performed a new study of the solar oxygen abundance based on the forbidden [OI] line at 5577.34 A, not previously considered. Methods: High-resolution (R > 500 000), high signal-to-noise (S/N > 1000) solar spectra of the [O I] 5577.34 A line have been analyzed employing both three-dimensional (3D) and a variety of 1D (spatially and temporally averaged 3D, Holweger & Muller, MARCS and Kurucz models with and without convective overshooting) model atmospheres. Results: The oxygen abundance obtained from the [OI] 5577.3 A forbidden line is almost insensitive to the input model atmosphere and has a mean value of A(O) = 8.71 +/- 0.02 (\\sigma from using the different model atmospheres). The total error (0.07 dex) is dominated by uncertainties in the log gf value (0.03 dex), apparent line variation (0.04 dex) and uncertainties in the continuum and line positions (0.05 dex). Conclusions: The here derived oxygen abundance is close to the 3D-based estimates from the two other [OI] lines at 6300 and 6363 A, the permitted OI lines and vibrational and rotational OH transitions in the infrared. Our study thus supports a low solar oxygen abundance (A(O) ~ 8.7), independent of the adopted model atmosphere.

Jorge Melendez; Martin Asplund

2008-08-20T23:59:59.000Z

91

Study Agriculture Abroad Check with the Study Abroad office for up to date costs, course restrictions, and application processes.  

E-Print Network [OSTI]

)* Australia - University of Western Australia (DEX) La Trobe University - Melbourne (ISEP) Finland Australia (DEX) La Trobe University - Melbourne (ISEP) Finland - University of Turku (ISEP) Univeristy) Sustainable Food & Bioenergy Systems Argentina - Universidad de Belgrano (CCIS)* Universidad del Salvador

Maxwell, Bruce D.

92

THE CO-TO-H{sub 2} CONVERSION FACTOR AND DUST-TO-GAS RATIO ON KILOPARSEC SCALES IN NEARBY GALAXIES  

SciTech Connect (OSTI)

We present ?kiloparsec spatial resolution maps of the CO-to-H{sub 2} conversion factor (?{sub CO}) and dust-to-gas ratio (DGR) in 26 nearby, star-forming galaxies. We have simultaneously solved for ?{sub CO} and the DGR by assuming that the DGR is approximately constant on kiloparsec scales. With this assumption, we can combine maps of dust mass surface density, CO-integrated intensity, and H I column density to solve for both ?{sub CO} and the DGR with no assumptions about their value or dependence on metallicity or other parameters. Such a study has just become possible with the availability of high-resolution far-IR maps from the Herschel key program KINGFISH, {sup 12}CO J = (2-1) maps from the IRAM 30 m large program HERACLES, and H I 21 cm line maps from THINGS. We use a fixed ratio between the (2-1) and (1-0) lines to present our ?{sub CO} results on the more typically used {sup 12}CO J = (1-0) scale and show using literature measurements that variations in the line ratio do not affect our results. In total, we derive 782 individual solutions for ?{sub CO} and the DGR. On average, ?{sub CO} = 3.1 M{sub ?} pc{sup 2} (K km s{sup 1}){sup 1} for our sample with a standard deviation of 0.3 dex. Within galaxies, we observe a generally flat profile of ?{sub CO} as a function of galactocentric radius. However, most galaxies exhibit a lower ?{sub CO} value in the central kiloparseca factor of ?2 below the galaxy mean, on average. In some cases, the central ?{sub CO} value can be factors of 5-10 below the standard Milky Way (MW) value of ?{sub CO,{sub MW}} = 4.4 M{sub ?} pc{sup 2} (K km s{sup 1}){sup 1}. While for ?{sub CO} we find only weak correlations with metallicity, the DGR is well-correlated with metallicity, with an approximately linear slope. Finally, we present several recommendations for choosing an appropriate ?{sub CO} for studies of nearby galaxies.

Sandstrom, K. M.; Walter, F. [Max Planck Institut fr Astronomie, Knigstuhl 17, D-69117 Heidelberg (Germany); Leroy, A. K. [National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States); Bolatto, A. D.; Wolfire, M. [Department of Astronomy, University of Maryland, College Park, MD 20742 (United States); Croxall, K. V.; Crocker, A. [Department of Physics and Astronomy, Mail Drop 111, University of Toledo, 2801 West Bancroft Street, Toledo, OH 43606 (United States); Draine, B. T.; Aniano, G. [Princeton University Observatory, Peyton Hall, Princeton, NJ 08544-1001 (United States); Wilson, C. D. [Department of Physics and Astronomy, McMaster University, Hamilton, Ontario L8S 4M1 (Canada); Calzetti, D. [Department of Astronomy, University of Massachusetts, Amherst, MA 01003 (United States); Kennicutt, R. C.; Galametz, M. [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA (United Kingdom); Donovan Meyer, J. [Department of Physics and Astronomy, SUNY Stony Brook, Stony Brook, NY 11794-3800 (United States); Usero, A. [Observatorio Astronmico Nacional, Alfonso XII, 3, E-28014 Madrid (Spain); Bigiel, F. [Institut fr theoretische Astrophysik, Zentrum fr Astronomie der Universitt Heidelberg, Albert-Ueberle Str. 2, D-69120 Heidelberg (Germany); Brinks, E. [Centre for Astrophysics Research, University of Hertfordshire, Hatfield AL10 9AB (United Kingdom); De Blok, W. J. G. [ASTRON, The Netherlands Institute for Radio Astronomy, Postbus 2, 7990-AA Dwingeloo (Netherlands); Dale, D. [Department of Physics and Astronomy, University of Wyoming, Laramie, WY 82071 (United States); Engelbracht, C. W., E-mail: sandstrom@mpia.de [Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States); and others

2013-11-01T23:59:59.000Z

93

MODELS FOR METAL-POOR STARS WITH ENHANCED ABUNDANCES OF C, N, O, Ne, Na, Mg, Si, S, Ca, AND Ti, IN TURN, AT CONSTANT HELIUM AND IRON ABUNDANCES  

SciTech Connect (OSTI)

Recent work has shown that most globular clusters have at least two chemically distinct components, as well as cluster-to-cluster differences in the mean [O/Fe], [Mg/Fe], and [Si/Fe] ratios at similar [Fe/H] values. In order to investigate the implications of variations in the abundances of these and other metals for H-R diagrams and predicted ages, grids of evolutionary sequences have been computed for scaled solar and enhanced {alpha}-element metal abundances, and for mixtures in which the assumed [m/Fe] value for each of the metals C, N, O, Ne, Na, Mg, Si, S, Ca, and Ti has been increased, in turn, by 0.4 dex at constant [Fe/H]. These tracks, together with isochrones for ages from Almost-Equal-To 5 to 14 Gyr, have been computed for -3.0 {<=} [Fe/H] {<=}-0.6, with helium abundances Y = 0.25, 0.29, and 0.33 at each [Fe/H] value, using upgraded versions of the Victoria stellar structure program and the Regina interpolation code, respectively. Turnoff luminosity versus age relations from isochrones are found to depend almost entirely on the importance of the CNO cycle, and thereby mainly on the abundance of oxygen. Since C, N, and O, as well as Ne and S, do not contribute significantly to the opacities at low temperatures and densities, variations in their abundances do not impact the predicted T{sub eff} scale of red giants. The latter is a strong function of the abundances of only Mg and Si (and Fe, possibly to a lesser extent) because they are so abundant and because they are strong sources of opacity at low temperatures. For these reasons, Mg and Si also have important effects on the temperatures of main-sequence stars. Due to their low abundances, Na, Ca, and Ti are of little consequence for stellar models. The effects of varying the adopted solar metals mixture and the helium abundance at a fixed [Fe/H] are also briefly discussed.

VandenBerg, Don A.; Dotter, Aaron [Department of Physics and Astronomy, University of Victoria, P.O. Box 3055, Victoria, B.C. V8W 3P6 (Canada); Bergbusch, Peter A. [Department of Physics, University of Regina, Regina, Saskatchewan S4S 0A2 (Canada); Ferguson, Jason W. [Department of Physics, Wichita State University, Wichita, KS 67260-0032 (United States); Michaud, Georges; Richer, Jacques [Departement de Physique, Universite de Montreal, Montreal, Quebec H3C 3J7 (Canada); Proffitt, Charles R., E-mail: vandenbe@uvic.ca, E-mail: Aaron.Dotter@gmail.com, E-mail: pbergbusch@accesscomm.ca, E-mail: proffitt@stsci.edu, E-mail: Jason.Ferguson@wichita.edu, E-mail: michaudg@astro.umontreal.ca, E-mail: jacques.richer@umontreal.ca [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States)

2012-08-10T23:59:59.000Z

94

MOLECULAR GAS AND STAR FORMATION IN NEARBY DISK GALAXIES  

SciTech Connect (OSTI)

We compare molecular gas traced by {sup 12}CO (2-1) maps from the HERACLES survey, with tracers of the recent star formation rate (SFR) across 30 nearby disk galaxies. We demonstrate a first-order linear correspondence between {Sigma}{sub mol} and {Sigma}{sub SFR} but also find important second-order systematic variations in the apparent molecular gas depletion time, {tau}{sub dep}{sup mol}={Sigma}{sub mol}/{Sigma}{sub SFR}. At the 1 kpc common resolution of HERACLES, CO emission correlates closely with many tracers of the recent SFR. Weighting each line of sight equally, using a fixed {alpha}{sub CO} equivalent to the Milky Way value, our data yield a molecular gas depletion time, {tau}{sub dep}{sup mol}={Sigma}{sub mol}/{Sigma}{sub SFR}{approx}2.2 Gyr with 0.3 dex 1{sigma} scatter, in very good agreement with recent literature data. We apply a forward-modeling approach to constrain the power-law index, N, that relates the SFR surface density and the molecular gas surface density, {Sigma}{sub SFR}{proportional_to}{Sigma}{sub mol}{sup N}. We find N = 1 {+-} 0.15 for our full data set with some scatter from galaxy to galaxy. This also agrees with recent work, but we caution that a power-law treatment oversimplifies the topic given that we observe correlations between {tau}{sub dep}{sup mol} and other local and global quantities. The strongest of these are a decreased {tau}{sub dep}{sup mol} in low-mass, low-metallicity galaxies and a correlation of the kpc-scale {tau}{sub dep}{sup mol} with dust-to-gas ratio, D/G. These correlations can be explained by a CO-to-H{sub 2} conversion factor ({alpha}{sub CO}) that depends on dust shielding, and thus D/G, in the theoretically expected way. This is not a unique interpretation, but external evidence of conversion factor variations makes this the most conservative explanation of the strongest observed {tau}{sub dep}{sup mol} trends. After applying a D/G-dependent {alpha}{sub CO}, some weak correlations between {tau}{sub dep}{sup mol} and local conditions persist. In particular, we observe lower {tau}{sub dep}{sup mol} and enhanced CO excitation associated with nuclear gas concentrations in a subset of our targets. These appear to reflect real enhancements in the rate of star formation per unit gas, and although the distribution of {tau}{sub dep} does not appear bimodal in galaxy centers, {tau}{sub dep} does appear multivalued at fixed {Sigma}{sub H2}, supporting the idea of ''disk'' and ''starburst'' modes driven by other environmental parameters.

Leroy, Adam K.; Munoz-Mateos, Juan-Carlos [National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22903 (United States); Walter, Fabian; Sandstrom, Karin; Meidt, Sharon; Rix, Hans-Walter; Schinnerer, Eva [Max Planck Institute fuer Astronomie, Koenigstuhl 17, D-69117 Heidelberg (Germany); Schruba, Andreas [California Institute for Technology, 1200 East California Boulevard, Pasadena, CA 91125 (United States); Bigiel, Frank [Theoretische Astrophysik, Albert-Ueberle-Str. 2, D-69120 Heidelberg (Germany); Bolatto, Alberto [Department of Astronomy, University of Maryland, College Park, MD (United States); Brinks, Elias [Centre for Astrophysics Research, University of Hertfordshire, Hatfield AL10 9AB (United Kingdom); De Blok, W. J. G. [Astrophysics, Cosmology and Gravity Centre, Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701 (South Africa); Rosolowsky, Erik [University of British Columbia, Okanagan Campus, Kelowna, BC (Canada); Schuster, Karl-Friedrich [IRAM, 300 rue de la Piscine, F-38406 St. Martin d'Heres (France); Usero, Antonio [Observatorio Astronomico Nacional, C/ Alfonso XII, 3, E-28014 Madrid (Spain)

2013-08-01T23:59:59.000Z

95

Kinetic Modeling of Toluene Oxidation for Surrogate Fuel Applications  

SciTech Connect (OSTI)

New environmental issues, like the effect of combustion-generated greenhouse gases, provide motivation to better characterize oxidation of hydrocarbons. Transportation, in particular, significantly contributes to energy consumption and CO{sub 2} emissions. Kinetic studies about the combustion of fuels under conditions typical of internal combustion engines provides important support to improve mechanism formulation and to eventually provide better computational tools that can be used to increase the engine performance. It is foreseeable that at least in the next 30 years the main transportation fuels will be either gasoline or diesel. Unfortunately, these fuels are very complex mixtures of many components. Moreover, their specifications and performance requirements significantly change the composition of these fuels: gasoline and diesel mixtures are different if coming from different refineries or they are different from winter to summer. At the same time a fuel with a well defined and reproducible composition is needed for both experimental and modeling work. In response to these issues, surrogate fuels are proposed. Surrogate fuels are defined as mixtures of a small number of hydrocarbons whose relative concentrations is adjusted in order to approximate the chemical and physical properties of a real fuel. Surrogate fuels are then very useful both for the design of reproducible experimental tests and also for the development of reliable kinetic models. The primary reference fuels (PRF) are a typical and old example of surrogate fuel: n-heptane and iso-octane mixtures are used to reproduce antiknock propensity of complex mixtures contained in a gasoline. PRFs are not able to surrogate gasoline in operating conditions different from standard ones and new surrogates have been recently proposed. Toluene is included in all of them as a species able to represent the behavior of aromatic compounds. On the other side, the toluene oxidation chemistry is not so well established and uncertainties still remain in the mechanism. This is especially true in the low temperature regime (< 850K). In these conditions, the toluene reactivity is too low to be conveniently investigated. Nonetheless, gasoline surrogates work in the engine at low temperatures, because of the presence of very reactive alkanes. The effect of these component interactions have to be taken into account. This work's aim is to present the model activity carried out by two different research groups, comparing the main pathways and results, matching data carried out in different devices both for pure toluene and mixtures. This is the starting point for a further activity to improve the two kinetic schemes.

Frassoldati, A; Mehl, M; Fietzek, R; Faravelli, T; Pitz, W J; Ranzi, E

2009-04-21T23:59:59.000Z

96

NEW RADIAL ABUNDANCE GRADIENTS FOR NGC 628 AND NGC 2403  

SciTech Connect (OSTI)

Motivated by recent interstellar medium studies, we present high quality MMT and Gemini spectroscopic observations of H II regions in the nearby spiral galaxies NGC 628 and NGC 2403 in order to measure their chemical abundance gradients. Using long-slit and multi-object mask optical spectroscopy, we obtained measurements of the temperature sensitive auroral lines [O III] ?4363 and/or [N II] ?5755 at a strength of 4? or greater in 11 H II regions in NGC 628 and 7 regions in NGC 2403. These observations allow us, for the first time, to derive an oxygen abundance gradient in NGC 628 based solely on 'direct' oxygen abundances of H II regions: 12 + log(O/H) = (8.43 0.03) + (0.017 0.002) R{sub g} (dex kpc{sup 1}), with a dispersion in log(O/H) of ? = 0.10 dex, from 14 regions with a radial coverage of ?2-19 kpc. This is a significantly shallower slope than found by previous 'strong-line' abundance studies. In NGC 2403, we derive an oxygen abundance gradient of 12 + log(O/H) = (8.48 0.04) + (0.032 0.007) R{sub g} (dex kpc{sup 1}), with a dispersion in log(O/H) of ? = 0.07 dex, from seven H II with a radial coverage of ?1-10 kpc. Additionally, we measure the N, S, Ne, and Ar abundances. We find the N/O ratio decreases with increasing radius for the inner disk, but reaches a plateau past R{sub 25} in NGC 628. NGC 2403 also has a negative N/O gradient with radius, but we do not sample the outer disk of the galaxy past R{sub 25} and so do not see evidence for a plateau. This bi-modal pattern measured for NGC 628 indicates dominant contributions from secondary nitrogen inside of the R{sub 25} transition and dominantly primary nitrogen farther out. As expected for ?-process elements, S/O, Ne/O, and Ar/O are consistent with constant values over a range in oxygen abundance.

Berg, Danielle A.; Skillman, Evan D. [Department of Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis, MN 55455 (United States); Croxall, Kevin V. [Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 (United States); Marble, Andrew R. [National Solar Observatory, 950 N Cherry Avenue, Tucson, AZ 85719 (United States); Smith, J. D. [Ritter Astrophysical Observatory, University of Toledo, Toledo, OH 43606 (United States); Gordon, Karl [Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 (United States); Kennicutt, Robert C. Jr. [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA (United Kingdom); Garnett, Donald R., E-mail: berg@astro.umn.edu, E-mail: skillman@astro.umn.edu, E-mail: croxall.5@osu.edu, E-mail: amarble@nso.edu, E-mail: jd.smith@utoledo.edu, E-mail: kgordon@stsci.edu, E-mail: robk@ast.cam.ac.uk

2013-10-01T23:59:59.000Z

97

Research Report Energy Efficiency Investments as an Economic Productivity Strategy for Texas  

E-Print Network [OSTI]

electrical blackouts? What if. . . What if the future no longer behaves like the past? An example? 0.80 0.90 1.00 1.10 1.20 1.30 1.40 1.50 1990 1995 2000 2005 2010 In dex (1990 = 1.00 ) Exploring Unexpected Outcomes What... Efficiency Resource Is Larger than Generally Believed 40 60 80 100 120 140 160 1970 1980 1990 2000 2010 2020 2030 2040 2050 P ri m ar y E ne rg y U se in Q ua ds Typical Pre-1980 Forecasts Low-Energy Future Projection Based Upon...

Laitner, J. A.

2011-01-01T23:59:59.000Z

98

Three-Dimensional Spectral Classification of Low-Metallicity Stars Using Artificial Neural Networks  

E-Print Network [OSTI]

We explore the application of artificial neural networks (ANNs) for the estimation of atmospheric parameters (Teff, logg, and [Fe/H]) for Galactic F- and G-type stars. The ANNs are fed with medium-resolution (~ 1-2 A) non flux-calibrated spectroscopic observations. From a sample of 279 stars with previous high-resolution determinations of metallicity, and a set of (external) estimates of temperature and surface gravity, our ANNs are able to predict Teff with an accuracy of ~ 135-150 K over the range 4250 <= Teff <= 6500 K, logg with an accuracy of ~ 0.25-0.30 dex over the range 1.0 <= logg <= 5.0 dex, and [Fe/H] with an accuracy ~ 0.15-0.20 dex over the range -4.0 <= [Fe/H] <= +0.3. Such accuracies are competitive with the results obtained by fine analysis of high-resolution spectra. It is noteworthy that the ANNs are able to obtain these results without consideration of photometric information for these stars. We have also explored the impact of the signal-to-noise ratio (S/N) on the behavior of ANNs, and conclude that, when analyzed with ANNs trained on spectra of commensurate S/N, it is possible to extract physical parameter estimates of similar accuracy with stellar spectra having S/N as low as 13. Taken together, these results indicate that the ANN approach should be of primary importance for use in present and future large-scale spectroscopic surveys.

Shawn Snider; Carlos Allende Prieto; Ted von Hippel; Timothy C. Beers; Christopher Sneden; Yuan Qu; and Silvia Rossi

2001-07-20T23:59:59.000Z

99

Chemical composition of the atmosphere of the K giant approx. Ser  

SciTech Connect (OSTI)

Spectrograms with a reciprocal dispersion of 6 A/mm have been used to study the atmosphere of the K III star approx. Ser. The chemical composition has been determined by the method of model atmospheres. The majority of elements have the solar abundance or exceed it by 0.2-0.4 dex. Reliable excesses are found for sodium Na I (0.8 dex), vanadium VI, and chromium Cr (0.5 dex).

Boyarchuk, M.E.; Orlov, M.Ya.; Shavrina, A.V.

1987-05-01T23:59:59.000Z

100

1, pp.588-589, 2013 Density Ratio Estimation  

E-Print Network [OSTI]

://sugiyama-www.cs.titech.ac.jp/~sugi [1] 1 p nu(x) {xnu i }nnu i=1 p de(x) {xde j }nde j=1 r (x) = p nu(x)/p de(x) `nu' `de'|x) p(y = `de'|x) p (y) p (y|x) {xnu i }nnu i=1 {xde j }nde j=1 p(y|x) r(x) r(x) = nde nnu p {xnu i }nnu i=1 {xde j }nde j=1 p nu(u) p de(u) Ep de [(p nu(u)/p de(u) - 1)2 ] 2 2

Sugiyama, Masashi

Note: This page contains sample records for the topic "antiknock in dex" from the National Library of EnergyBeta (NLEBeta).
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We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

The Nature and Orbit of the Ophiuchus Stream  

E-Print Network [OSTI]

The Ophiuchus stream is the most recently discovered stellar tidal stream in the Milky Way (Bernard et al. 2014). We present high-quality spectroscopic data for 14 stream member stars obtained using the Keck and MMT telescopes. We confirm the stream as a fast moving ($v_{los}\\sim290$ km s$^{-1}$), kinematically-cold group ($\\sigma_{v_{los}}\\lesssim1$ km s$^{-1}$) of $\\alpha-$enhanced and metal-poor stars (${\\rm [\\alpha/Fe]\\sim0.4}$ dex, ${\\rm [Fe/H]\\sim-2.0}$ dex). Using a probabilistic technique, we model the stream simultaneously in line-of-sight velocity, color-magnitude, coordinate, and proper motion space, and so determine its distribution in 6D phase-space. We find that that the stream extends in distance from 8 to 9.5 kpc from the Sun; it is 50 times longer than wide, merely appearing highly foreshortened in projection. The analysis of the stellar population contained in the stream suggests that it is $\\sim13$ Gyr old, and that its initial stellar mass was $\\sim2\\times10^4$ $M_\\sun$ (or at least $\\ga4\\...

Sesar, B; Bernard, E J; Caldwell, N; Cohen, J G; Fouesneau, M; Johnson, C I; Ness, M; Ferguson, A M N; Martin, N F; Rix, H -W; Schlafly, E F; Burgett, W S; Chambers, K C; Flewelling, H; Hodapp, K W; Kaiser, N; Magnier, E A; Platais, I; Tonry, J L; Waters, C; Wyse, R F G

2015-01-01T23:59:59.000Z

102

THE HETDEX PILOT SURVEY. IV. THE EVOLUTION OF [O II] EMITTING GALAXIES FROM z {approx} 0.5 TO z {approx} 0  

SciTech Connect (OSTI)

We present an analysis of the luminosities and equivalent widths of the 284 z < 0.56 [O II]-emitting galaxies found in the 169 arcmin{sup 2} pilot survey for the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). By combining emission-line fluxes obtained from the Mitchell spectrograph on the McDonald 2.7 m telescope with deep broadband photometry from archival data, we derive each galaxy's dereddened [O II] {lambda}3727 luminosity and calculate its total star formation rate. We show that over the last {approx}5 Gyr of cosmic time, there has been substantial evolution in the [O II] emission-line luminosity function, with L* decreasing by {approx}0.6 {+-} 0.2 dex in the observed function, and by {approx}0.9 {+-} 0.2 dex in the dereddened relation. Accompanying this decline is a significant shift in the distribution of [O II] equivalent widths, with the fraction of high equivalent-width emitters declining dramatically with time. Overall, the data imply that the relative intensity of star formation within galaxies has decreased over the past {approx}5 Gyr, and that the star formation rate density of the universe has declined by a factor of {approx}2.5 between z {approx} 0.5 and z {approx} 0. These observations represent the first [O II]-based star formation rate density measurements in this redshift range, and foreshadow the advancements which will be generated by the main HETDEX survey.

Ciardullo, Robin; Gronwall, Caryl; Schneider, Donald P.; Zeimann, Gregory R., E-mail: rbc@astro.psu.edu, E-mail: caryl@astro.psu.edu, E-mail: dps@astro.psu.edu, E-mail: grzeimann@psu.edu [Department of Astronomy and Astrophysics, Pennsylvania State University, University Park, PA 16802 (United States); and others

2013-05-20T23:59:59.000Z

103

The First Billion Years of a Warm Dark Matter Universe  

E-Print Network [OSTI]

We present results of cosmological N-body hydrodynamic chemistry simulations of primordial structure growth and evolution in a scenario with warm dark matter (WDM) having a mass of 3keV and compare with a model consisting of standard cold dark matter (CDM). We focus on the high-redshift universe ($z>6$), where the structure formation process should better reflect the primordial (linear) differences in terms of matter power spectrum. We find that early epochs are exceptional probes of the dark-matter nature. Non-linear CDM and WDM power spectra differ by up to 2 dex at early times and show spreads of factor of a few persisting in the whole first Gyr. Primordial WDM objects with masses $\\lesssim 10^8\\,\\rm M_\\odot$ are less abundant by $\\gtrsim 1\\,\\rm dex$, both in terms of dark matter and of baryon content. Runaway molecular cooling in primordial WDM mini-haloes results severely inhibited due to the damping of power at large $k$ modes. As a consequence, the cosmic (population III and II-I) star formation activi...

Maio, Umberto

2014-01-01T23:59:59.000Z

104

The SEGUE Stellar Parameter Pipeline. II. Validation with Galactic Globular and Open Clusters  

E-Print Network [OSTI]

We validate the performance and accuracy of the current SEGUE (Sloan Extension for Galactic Understanding and Exploration) Stellar Parameter Pipeline (SSPP), which determines stellar atmospheric parameters (effective temperature, surface gravity, and metallicity) by comparing derived overall metallicities and radial velocities from selected likely members of three globular clusters (M 13, M 15, and M 2) and two open clusters (NGC 2420 and M 67) to the literature values. Spectroscopic and photometric data obtained during the course of the original Sloan Digital Sky Survey (SDSS-I) and its first extension (SDSS-II/SEGUE) are used to determine stellar radial velocities and atmospheric parameter estimates for stars in these clusters. Based on the scatter in the metallicities derived for the members of each cluster, we quantify the typical uncertainty of the SSPP values, sigma([Fe/H]) = 0.13 dex for stars in the range of 4500 K < Teff < 7500 K and 2.0 < log g < 5.0, at least over the metallicity interval spanned by the clusters studied (-2.3 < [Fe/H] < 0). The surface gravities and effective temperatures derived by the SSPP are also compared with those estimated from the comparison of the color-magnitude diagrams with stellar evolution models; we find satisfactory agreement. At present, the SSPP underestimates [Fe/H] for near-solar-metallicity stars, represented by members of M 67 in this study, by about 0.3 dex.

Y. S. Lee; T. C. Beers; T. Sivarani; J. A. Johnson; D. An; R. Wilhelm; C. Allende Prieto; L. Koesterke; P. Re Fiorentin; C. A. L. Bailer-Jones; J. E. Norris; B. Yanny; C. M. Rockosi; H. J. Newberg; K. M. Cudworth; K. Pan

2007-10-31T23:59:59.000Z

105

The solar oxygen crisis: Probably not the last word  

E-Print Network [OSTI]

In this work we present support for recent claims that advocate a downward revision of the solar oxygen abundance. Our analysis employs spatially-resolved spectro-polarimetric observations including the \\FeI lines at 6302 \\AA and the \\OI infrared triplet around 7774 \\AA in the quiet Sun. We used the \\FeI lines to reconstruct the three-dimensional thermal and magnetic structure of the atmosphere. The simultaneous \\OI observations were then employed to determine the abundance of oxygen at each pixel, using both LTE and non-LTE (NLTE) approaches to the radiative transfer. In this manner, we obtain values of \\lgEO=8.63 (NLTE) and 8.93 (LTE) dex. We find an unsettling fluctuation of the oxygen abundance over the field of view. This is likely an artifact indicating that, even with this relatively refined strategy, important physical ingredients are still missing in the picture. By examining the spatial distribution of the abundance, we estimate realistic confidence limits of approximately 0.1 dex.

H. Socas-Navarro A. A. Norton

2007-02-06T23:59:59.000Z

106

The solar photospheric abundance of phosphorus: results from co5bold 3D model atmospheres  

E-Print Network [OSTI]

aims: We determine the solar abundance of phosphorus using co5bold 3D hydrodynamic model atmospheres. method: High resolution, high signal-to-noise solar spectra of the PI lines of Multiplet 1 at 1051-1068 nm are compared to line formation computations performed on a co5bold solar model atmosphere. results: We find A(P)=5.46+- 0.04, in good agreement with previous analysis based on 1D model atmospheres, due to the fact that the PI lines of Mult. 1 are little affected by 3D effects. We cannot confirm an earlier claim by other authors of a downward revision of the solar P abundance by 0.1 dex employing a 3D model atmosphere. Concerning other stars, we found modest (<0.1 dex) 3D abundance corrections for P among four F dwarf model atmospheres of different metallicity, being largest at lowest metallicity. conclusions: We conclude that 3D abundance corrections are generally rather small for the PI lines studied in this work. They are marginally relevant for metal-poor stars, but may be neglected in the Sun.

Elisabetta Caffau; Matthias Steffen; Luca Sbordone; Hans-G. Ludwig; Piercarlo Bonifacio

2007-08-12T23:59:59.000Z

107

The SEGUE Stellar Parameter Pipeline. III. Comparison with High-Resolution Spectroscopy of SDSS/SEGUE Field Stars  

E-Print Network [OSTI]

We report high-resolution spectroscopy of 125 field stars previously observed as part of the Sloan Digital Sky Survey and its program for Galactic studies, the Sloan Extension for Galactic Understanding and Exploration (SEGUE). These spectra are used to measure radial velocities and to derive atmospheric parameters, which we compare with those reported by the SEGUE Stellar Parameter Pipeline (SSPP). The SSPP obtains estimates of these quantities based on SDSS ugriz photometry and low-resolution (R = 2000) spectroscopy. For F- and G-type stars observed with high signal-to-noise ratios (S/N), we empirically determine the typical random uncertainties in the radial velocities, effective temperatures, surface gravities, and metallicities delivered by the SSPP to be 2.4 km/s, 130 K (2.2%), 0.21 dex, and 0.11 dex, respectively, with systematic uncertainties of a similar magnitude in the effective temperatures and metallicities. We estimate random errors for lower S/N spectra based on numerical simulations.

C. Allende Prieto; T. Sivarani; T. C. Beers; Y. S. Lee; L. Koesterke; M. Shetrone; C. Sneden; D. L. Lambert; R. Wilhelm; C. M. Rockosi; D. Lai; B. Yanny; I. I. Ivans; J. A. Johnson; W. Aoki; C. A. L. Bailer-Jones; P. Re Fiorentin

2007-10-31T23:59:59.000Z

108

High Precision Abundances of the Old Solar Twin HIP 102152: Insights on Li Depletion from the Oldest Sun  

E-Print Network [OSTI]

We present the first detailed chemical abundance analysis of the old 8.2 Gyr solar twin, HIP 102152. We derive differential abundances of 21 elements relative to the Sun with precisions as high as 0.004 dex ($\\lesssim$1%), using ultra high-resolution (R = 110,000), high S/N UVES spectra obtained on the 8.2-m Very Large Telescope. Our determined metallicity of HIP 102152 is [Fe/H] = -0.013 $\\pm$ 0.004. The atmospheric parameters of the star were determined to be 54 K cooler than the Sun, 0.09 dex lower in surface gravity, and a microturbulence identical to our derived solar value. Elemental abundance ratios examined vs. dust condensation temperature reveal a solar abundance pattern for this star, in contrast to most solar twins. The abundance pattern of HIP 02152 appears to be the most similar to solar of any known solar twin. Abundances of the younger, 2.9 Gyr solar twin, 18 Sco, were also determined from UVES spectra to serve as a comparison for HIP 102152. The solar chemical pattern of HIP 102152 makes it a...

Monroe, TalaWanda R; Ramrez, Ivn; Yong, David; Bergemann, Maria; Asplund, Martin; Bean, Jacob; Bedell, Megan; Maia, Marcelo Tucci; Lind, Karin; Alves-Brito, Alan; Casagrande, Luca; Castro, Matthieu; Nascimento, Jos-Dias do; Bazot, Michael; Freitas, Fabrcio C

2013-01-01T23:59:59.000Z

109

C IV LINE-WIDTH ANOMALIES: THE PERILS OF LOW SIGNAL-TO-NOISE SPECTRA  

SciTech Connect (OSTI)

Comparison of six high-redshift quasar spectra obtained with the Large Binocular Telescope with previous observations from the Sloan Digital Sky Survey shows that failure to correctly identify absorption and other problems with accurate characterization of the C IV ?1549 emission line profile in low signal-to-noise (S/N) data can severely limit the reliability of single-epoch mass estimates based on the C IV emission line. We combine the analysis of these new high-quality data with a reanalysis of three other samples based on high-S/N spectra of the C IV emission line region. We find that a large scatter between the H?- and C IV-based masses remains even for this high-S/N sample when using the FWHM to characterize the broad-line region velocity dispersion and the standard virial assumption to calculate the mass. However, we demonstrate that using high-quality data and the line dispersion to characterize the C IV line width leads to a high level of consistency between C IV- and H?-based masses, with <0.3 dex of observed scatter and an estimated ?0.2 dex intrinsic scatter, in the mass residuals.

Denney, K. D.; Vestergaard, M. [Dark Cosmology Centre, Niels Bohr Institute, Juliane Maries Vej 30, DK-2100 Copenhagen (Denmark); Pogge, R. W.; Kochanek, C. S.; Peterson, B. M. [Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 (United States); Assef, R. J., E-mail: kelly@dark-cosmology.dk [Jet Propulsion Laboratory, California Institute of Technology, MS 169-530, 4800 Oak Grove Drive, Pasadena, CA 91109 (United States)

2013-09-20T23:59:59.000Z

110

Accurate parameters of 93 solar-type Kepler targets  

E-Print Network [OSTI]

We present a detailed spectroscopic study of 93 solar-type stars that are targets of the NASA/Kepler mission and provide detailed chemical composition of each target. We find that the overall metallicity is well-represented by Fe lines. Relative abundances of light elements (CNO) and alpha-elements are generally higher for low-metallicity stars. Our spectroscopic analysis benefits from the accurately measured surface gravity from the asteroseismic analysis of the Kepler light curves. The log g parameter is known to better than 0.03 dex and is held fixed in the analysis. We compare our Teff determination with a recent colour calibration of V-K (TYCHO V magnitude minus 2MASS Ks magnitude) and find very good agreement and a scatter of only 80 K, showing that for other nearby Kepler targets this index can be used. The asteroseismic log g values agree very well with the classical determination using Fe1-Fe2 balance, although we find a small systematic offset of 0.08 dex (asteroseismic log g values are lower). The ...

Bruntt, H; Smalley, B; Chaplin, W J; Verner, G A; Bedding, T R; Catala, C; Gazzano, J -C; Molenda-Zakowicz, J; Thygesen, A O; Uytterhoeven, K; Hekker, S; Huber, D; Karoff, C; Mathur, S; Mosser, B; Appourchaux, T; Campante, T L; Elsworth, Y; Garcia, R A; Handberg, R; Metcalfe, T S; Quirion, P -O; Regulo, C; Roxburgh, I W; Stello, D; Christensen-Dalsgaard, J; Kawaler, S D; Kjeldsen, H; Morris, R L; Quintana, E V; Sanderfer, D T

2012-01-01T23:59:59.000Z

111

A&A manuscript no. (will be inserted by hand later)  

E-Print Network [OSTI]

. An un­ derabundance of iron by 1 dex with respect to the sun is found, while nickel displays a solar abundance. The re­ duced nFe =nNi ratio (¸1 dex compared to the solar value) is an important hint

Jeffery, Simon

112

Simulations of the effect of final state interactions on the scattering reponses of helium droplets  

E-Print Network [OSTI]

(i p, j p)+rzoz(i p, j p)vv2) if(rr. lt. rc) rr=rc dex=dex+findx(rr) rr=sqrt(rxy2(i p, j p)+(z-rp(j p, 3))vv2) if(rr. lt. rc) rr=rc dex=dex-findx(rr) endif continue cr=exp(0. 5edex) cc=cr?exp(uivse(hm*v(i d)/q-q))epsai(i d)/psai(1) ri(i b)=r1(i...(i p, j p)+rzoz(i p, j p)vv2) if(rr. lt. rc) rr=rc dex=dex+findx(rr) rr=sqrt(rxy2(i p, j p)+(z-rp(j p, 3))vv2) if(rr. lt. rc) rr=rc dex=dex-findx(rr) endif continue cr=exp(0. 5edex) cc=cr?exp(uivse(hm*v(i d)/q-q))epsai(i d)/psai(1) ri(i b)=r1(i...

Yang, Jian

2012-06-07T23:59:59.000Z

113

THE EVOLUTION OF THE STELLAR MASS FUNCTIONS OF STAR-FORMING AND QUIESCENT GALAXIES TO z = 4 FROM THE COSMOS/UltraVISTA SURVEY  

SciTech Connect (OSTI)

We present measurements of the stellar mass functions (SMFs) of star-forming and quiescent galaxies to z = 4 using a sample of 95,675 K{sub s} -selected galaxies in the COSMOS/UltraVISTA field. The SMFs of the combined population are in good agreement with previous measurements and show that the stellar mass density of the universe was only 50%, 10%, and 1% of its current value at z ? 0.75, 2.0, and 3.5, respectively. The quiescent population drives most of the overall growth, with the stellar mass density of these galaxies increasing as ?{sub star}?(1 + z){sup 4.70.4} since z = 3.5, whereas the mass density of star-forming galaxies increases as ?{sub star}?(1 + z){sup 2.30.2}. At z > 2.5, star-forming galaxies dominate the total SMF at all stellar masses, although a non-zero population of quiescent galaxies persists to z = 4. Comparisons of the K{sub s} -selected star-forming galaxy SMFs with UV-selected SMFs at 2.5 < z < 4 show reasonable agreement and suggest that UV-selected samples are representative of the majority of the stellar mass density at z > 3.5. We estimate the average mass growth of individual galaxies by selecting galaxies at fixed cumulative number density. The average galaxy with log(M{sub star}/M{sub ?}) = 11.5 at z = 0.3 has grown in mass by only 0.2 dex (0.3 dex) since z = 2.0 (3.5), whereas those with log(M{sub star}/M{sub ?}) = 10.5 have grown by >1.0 dex since z = 2. At z < 2, the time derivatives of the mass growth are always larger for lower-mass galaxies, which demonstrates that the mass growth in galaxies since that redshift is mass-dependent and primarily bottom-up. Lastly, we examine potential sources of systematic uncertainties in the SMFs and find that those from photo-z templates, stellar population synthesis modeling, and the definition of quiescent galaxies dominate the total error budget in the SMFs.

Muzzin, Adam; Franx, Marijn; Labb, Ivo [Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden (Netherlands); Marchesini, Danilo [Department of Physics and Astronomy, Tufts University, Medford, MA 06520 (United States); Stefanon, Mauro [Physics and Astronomy Department, University of Missouri, Columbia, MO 65211 (United States); McCracken, Henry J. [Institut d'Astrophysique de Paris, UMR7095 CNRS, Universit Pierre et Marie Curie, 98 bis Boulevard Arago, F-75014 Paris (France); Milvang-Jensen, Bo; Fynbo, J. P. U. [Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, DK-2100 Copenhagen (Denmark); Dunlop, James S. [SUPA, Institute for Astronomy, University of Edinburgh, Royal Observatory, Edinburgh EH9 3HJ (United Kingdom); Brammer, Gabriel [European Southern Observatory, Alonso de Crdova 3107, Casilla 19001, Vitacura, Santiago (Chile); Van Dokkum, Pieter G. [Department of Astronomy, Yale University, New Haven, CT 06520-8101 (United States)

2013-11-01T23:59:59.000Z

114

THE PECULIAR SOLAR COMPOSITION AND ITS POSSIBLE RELATION TO PLANET FORMATION  

SciTech Connect (OSTI)

We have conducted a differential elemental abundance analysis of unprecedented accuracy (approx0.01 dex) of the Sun relative to 11 solar twins from the Hipparcos catalog and 10 solar analogs from planet searches. We find that the Sun shows a characteristic signature with a approx20% depletion of refractory elements relative to the volatile elements in comparison with the solar twins. The abundance differences correlate strongly with the condensation temperatures of the elements. This peculiarity also holds in comparisons with solar analogs known to have close-in giant planets while the majority of solar analogs found not to have such giant planets in radial velocity monitoring show the solar abundance pattern. We discuss various explanations for this peculiarity, including the possibility that the differences in abundance patterns are related to the formation of planetary systems like our own, in particular to the existence of terrestrial planets.

Melendez, J. [Centro de Astrofisica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto (Portugal); Asplund, M. [Max-Planck-Institut fuer Astrophysik, Karl-Schwarzschild-Str. 1, Postfach 1317, D-85741 Garching (Germany); Gustafsson, B. [Institutionen foer fysik och astronomi, Uppsala universitet, Box 515, SE-75120 Uppsala (Sweden); Yong, D., E-mail: jorge@astro.up.p [Research School of Astronomy and Astrophysics, Australian National University, Mount Stromlo Observatory, Cotter Road, Weston Creek, ACT 2611 (Australia)

2009-10-10T23:59:59.000Z

115

What Is The Neon Abundance Of The Sun?  

E-Print Network [OSTI]

We have evolved a series of thirteen complete solar models that utilize different assumed heavy element compositions. Models that are based upon the heavy element abundances recently determined by Asplund, Grevesse, and Sauval (2005) are inconsistent with helioseismological measurements. However, models in which the neon abundance is increased by 0.4-0.5 dex to log N(Ne) = 8.29 +- 0.05 (on the scale in which log N(H) = 12) are consistent with the helioseismological measurements even though the other heavy element abundances are in agreement with the determinations of Asplund et al. (2005). These results sharpen and strengthen an earlier study by Antia and Basu (2005). The predicted solar neutrino fluxes are affected by the uncertainties in the composition by less than their 1sigma theoretical uncertainties.

John N. Bahcall; Sarbani Basu; Aldo M. Serenelli

2005-05-16T23:59:59.000Z

116

Light bosons and photospheric solutions to the solar abundance problem  

E-Print Network [OSTI]

It is well known that current spectroscopic determinations of the chemical composition of the Sun are starkly at odds with the metallicity implied by helioseismology. We propose that the discrepancy may be due to conversion of photons to a new light boson in the solar photosphere. We investigate the impact of particles with axion-like interactions with the photon on the inferred photospheric abundances. Conversion of photons into new light bosons can in principle easily produce the +0.2 dex change in derived abundances required to reconcile spectroscopic and helioseismological determinations of the solar metallicity. We show that this is however not possible for any of the presently-allowed parameter space of either the QCD axion or a standard axion-like particle. We speculate that other models involving photon-boson mixing, such as hidden photons, might prove more successful.

Vincent, Aaron C; Trampedach, Regner

2012-01-01T23:59:59.000Z

117

Internal Dynamics, Structure and Formation of Dwarf Elliptical Galaxies: II. Rotating Versus Non-Rotating Dwarfs  

E-Print Network [OSTI]

We present spatially-resolved internal kinematics and stellar chemical abundances for a sample of dwarf elliptical (dE) galaxies in the Virgo Cluster observed with Keck/ESI. We find that 4 out of 17 dEs have major axis rotation velocities consistent with rotational flattening, while the remaining dEs have no detectable major axis rotation. Despite this difference in internal kinematics, rotating and non-rotating dEs are remarkably similar in terms of their position in the Fundamental Plane, morphological structure, stellar populations, and local environment. We present evidence for faint underlying disks and/or weak substructure in a fraction of both rotating and non-rotating dEs, but a comparable number of counter-examples exist for both types which show no evidence of such structure. Absorption-line strengths were determined based on the Lick/IDS system (Hbeta, Mgb, Fe5270, Fe5335) for the central region of each galaxy. We find no difference in the line-strength indices, and hence stellar populations, between rotating and non-rotating dE galaxies. The best-fitting mean age and metallicity for our 17 dE sample are 5 Gyr and Fe/H = -0.3 dex, respectively, with rms spreads of 3 Gyr and 0.1 dex. The majority of dEs are consistent with solar alpha/Fe abundance ratios. By contrast, the stellar populations of classical elliptical galaxies are, on average, older, more metal rich, and alpha-enhanced relative to our dE sample. The local environments of both dEs types appear to be diverse in terms of their proximity to larger galaxies in real or velocity space within the Virgo Cluster. Thus, rotating and non-rotating dEs are remarkably similar in terms of their structure, stellar content, and local environments, presenting a significant challenge to theoretical models of their formation. (abridged)

M. Geha; P. Guhathakurta; R. van der Marel

2003-06-17T23:59:59.000Z

118

Condensation temperature trends among stars with planets  

E-Print Network [OSTI]

Results from detailed spectroscopic analyses of stars hosting massive planets are employed to search for trends between abundances and condensation temperatures. The elements C, S, Na, Mg, Al, Ca, Sc, Ti, V, Cr, Mn, Fe, Ni and Zn are included in the analysis of 64 stars with planets and 33 comparison stars. No significant trends are evident in the data. This null result suggests that accretion of rocky material onto the photospheres of stars with planets is not the primary explanation for their high metallicities. However, the differences between the solar photospheric and meteoritic abundances do display a weak but significant trend with condensation temperature. This suggests that the metallicity of the sun's envelope has been enriched relative to its interior by about 0.07 dex.

Guillermo Gonzalez

2005-12-08T23:59:59.000Z

119

CALIBRATIONS OF ATMOSPHERIC PARAMETERS OBTAINED FROM THE FIRST YEAR OF SDSS-III APOGEE OBSERVATIONS  

SciTech Connect (OSTI)

The Sloan Digital Sky Survey III (SDSS-III) Apache Point Observatory Galactic Evolution Experiment (APOGEE) is a three-year survey that is collecting 10{sup 5} high-resolution spectra in the near-IR across multiple Galactic populations. To derive stellar parameters and chemical compositions from this massive data set, the APOGEE Stellar Parameters and Chemical Abundances Pipeline (ASPCAP) has been developed. Here, we describe empirical calibrations of stellar parameters presented in the first SDSS-III APOGEE data release (DR10). These calibrations were enabled by observations of 559 stars in 20 globular and open clusters. The cluster observations were supplemented by observations of stars in NASA's Kepler field that have well determined surface gravities from asteroseismic analysis. We discuss the accuracy and precision of the derived stellar parameters, considering especially effective temperature, surface gravity, and metallicity; we also briefly discuss the derived results for the abundances of the ?-elements, carbon, and nitrogen. Overall, we find that ASPCAP achieves reasonably accurate results for temperature and metallicity, but suffers from systematic errors in surface gravity. We derive calibration relations that bring the raw ASPCAP results into better agreement with independently determined stellar parameters. The internal scatter of ASPCAP parameters within clusters suggests that metallicities are measured with a precision better than 0.1 dex, effective temperatures better than 150 K, and surface gravities better than 0.2 dex. The understanding provided by the clusters and Kepler giants on the current accuracy and precision will be invaluable for future improvements of the pipeline.

Mszros, Sz.; Allende Prieto, C. [Instituto de Astrofsica de Canarias (IAC), E-38200 La Laguna, Tenerife (Spain); Holtzman, J. [New Mexico State University, Las Cruces, NM 88003 (United States); Garca Prez, A. E.; Chojnowski, S. D.; Hearty, F. R.; Majewski, S. R. [Department of Astronomy, University of Virginia, Charlottesville, VA 22904-4325 (United States); Schiavon, R. P. [Astrophysics Research Institute, Liverpool John Moores University, Egerton Wharf, Birkenhead, Wirral CH41 1LD (United Kingdom); Basu, S. [Department of Astronomy, Yale University, P.O. Box 208101, New Haven, CT 06520-8101 (United States); Bizyaev, D. [Apache Point Observatory, P.O. Box 59, Sunspot, NM 88349-0059 (United States); Chaplin, W. J.; Elsworth, Y. [University of Birmingham, School of Physics and Astronomy, Edgbaston, Birmingham B15 2TT (United Kingdom); Cunha, K. [Steward Observatory, University of Arizona, Tucson, AZ 85721 (United States); Epstein, C.; Johnson, J. A. [Department of Astronomy, The Ohio State University, Columbus, OH 43210 (United States); Frinchaboy, P. M. [Texas Christian University, Fort Worth, TX 76129 (United States); Garca, R. A. [Laboratoire AIM, CEA/DSM-CNRS-Universit Paris Diderot, IRFU/SAp, Centre de Saclay, F-91191 Gif-sur-Yvette Cedex (France); Hekker, S. [Astronomical Institute ''Anton Pannekoek'', University of Amsterdam, Science Park 904, 1098 XH Amsterdam (Netherlands); Kallinger, T. [Institute for Astronomy, University of Vienna, Trkenschanzstrasse 17, A-1180 Vienna (Austria); Koesterke, L. [Texas Advanced Computing Center, University of Texas, Austin, TX 78759 (United States); and others

2013-11-01T23:59:59.000Z

120

The chemical abundances of the Ap star HD94660  

SciTech Connect (OSTI)

In this work I present the determination of chemical abundances of the Ap star HD94660, a possible rapid oscillating star. As all the magnetic chemically peculiar objects, it presents CNO underabundance and overabundance of iron peak elements of ?100 times and of rare earths up to 4 dex with respect to the Sun. The determination was based on the conversion of the observed equivalent widths into abundances simultaneously to the determination of effective temperature and gravity. Since the Balmer lines of early type stars are very sensitive to the surface gravity while the flux distribution is sensitive to the effective temperature, I have adopted an iterative procedure to match the H{sub ?} line profile and the observed UV-Vis-NIR magnitudes of HD94660 looking for a consistency between the metallicity of the atmosphere model and the derived abundances. From my spectroscopic analysis, this star belongs to the no-rapid oscillating class.

Giarrusso, M. [Universit di Catania, Dipartimento di Fisica e Astronomia, Sezione Astrofisica, Via S. Sofia 78, 95123 Catania (Italy); INAF - Osservatorio Astrofisico di Catania, via S. Sofia 78, 95123 Catania (Italy); INFN - Laboratori Nazionali del Sud (Italy)

2014-05-09T23:59:59.000Z

Note: This page contains sample records for the topic "antiknock in dex" from the National Library of EnergyBeta (NLEBeta).
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to obtain the most current and comprehensive results.


121

Spectrophotometric analysis of the primary component of V 380 Cyg  

SciTech Connect (OSTI)

The curve-of-growth method and spectrograms obtained with the 6-m telescope were used to determine the parameters of the atmosphere of the primary component of the close binary system V 380 Cyg: T/sub e/ = 22,500/sup 0/K, log g = 3.4, V/sub t/ = 3.28 km/sec. The value of log g is confirmed by comparison of the observed profiles and the equivalent widths of the hydrogen lines with the theoretical results. The method of model atmospheres was used to determine the chemical composition. For the majority of elements, excesses of the abundances from 0.2 to 1.0 in the logarithm of the number of atoms were found; the helium abundance was found to be two times greater than the solar abundance, the calcium abundance 0.3 dex less than the solar value.

Leushin, V.V.; Topil'skaya, G.P.

1987-03-01T23:59:59.000Z

122

The abundance pattern of the lambda Bootis stars  

E-Print Network [OSTI]

Within a project to investigate the properties of lambda Bootis stars, we report on their abundance pattern. High resolution spectra have been obtained for a total of twelve candidate lambda Bootis stars, four of them being contained in spectroscopic binary systems, and detailed abundance analyses have been performed. All program stars show a characteristic lambda Bootis abundance pattern (deficient heavy elements and solar abundant light elements) and an enhanced abundance of Na. This work raises the fraction of lambda Bootis stars with known abundances to 50%. The resulting abundances complemented by literature data are used to construct a "mean lambda Bootis abundance pattern", which exhibits, apart from general underabundances of heavy elements (about -1 dex) and solar abundances of C, N, O, Na and S, a star-to-star scatter which is up to twice as large as for a comparable sample of normal stars.

U. Heiter

2001-12-07T23:59:59.000Z

123

A NEW SYNTHETIC LIBRARY OF THE NEAR-INFRARED Ca II TRIPLET INDICES. I. INDEX DEFINITION, CALIBRATION, AND RELATIONS WITH STELLAR ATMOSPHERIC PARAMETERS  

SciTech Connect (OSTI)

Adopting the SPECTRUM package, which is a stellar spectral synthesis program, we have synthesized a comprehensive set of 2890 near-infrared (NIR) synthetic spectra with a resolution and wavelength sampling similar to the Sloan Digital Sky Survey (SDSS) and the forthcoming Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectra. During the synthesis, we applied the 'New grids of ATLAS9 Model Atmosphere' to develop a grid of local thermodynamic equilibrium model atmospheres for effective temperatures (T{sub eff}) ranging from 3500 to 7500 K, for surface gravities (log g) from 0.5 to 5.0 dex, for metallicities ([Fe/H]) from -4.0 to 0.5 dex, and for solar ([{alpha}/Fe] = 0.0 dex) and non-solar ([{alpha}/Fe] = +0.4 dex) abundances. This synthetic stellar library is composed of 1350 solar scaled abundance (SSA) and 1530 non-solar scaled abundance (NSSA) spectra, grounding on which we have defined a new set of NIR Ca II triplet indices and an index CaT as the sum of the three. These defined indices were automatically measured on every spectrum of the synthetic stellar library and calibrated with the indices computed on the observational spectra from the INDO-U.S. stellar library. In order to check the effect of {alpha}-element enhancement on the so-defined Ca II indices, we compared indices measured on the SSA spectra with those on the NSSA ones at the same trine of stellar parameters (T{sub eff}, log g, [Fe/H]); luckily, little influences of {alpha}-element enhancement were found. Furthermore, comparisons of our synthetic indices with the observational ones from measurements on the INDO-U.S. stellar library, the SDSS-DR7 and SDSS-DR8 spectroscopic survey are presented, respectively, for dwarfs and giants in specific. For dwarfs, our synthetic indices could well reproduce the behaviors of the observational indices versus stellar parameters, which verifies the validity of our index definitions for dwarfs. For giants, the consistency between our synthetic indices and the observational ones does not appear to be as good. However, a new synthetic library of NIR Ca II indices has been founded for deeper studies on the NIR wave band of stellar spectra, and this library is particularly appropriate for the SDSS and the forthcoming LAMOST stellar spectra. We have regressed the strength of the CaT index as a function of stellar parameters for both dwarfs and giants after a series of experimental investigations into relations of the indices with stellar parameters. For dwarfs, log g has little effect on the indices, while [Fe/H] and T{sub eff} play a role together. The leading factor is probably [Fe/H], which changes the strength of the indices by a positive trend. For giants, log g starts to influence the strength of the indices by a negative trend for the metal-poor, and even impact deeply for the metal-rich; besides, [Fe/H] and T{sub eff} still matter. In addition, we briefly discussed the major differences between our Ca II triplet indices and the CaHK doublet indices. Ultimately, a supplemental experiment was carried out to show that spectral noises do have effects on our set of NIR Ca II indices. However, the influence is not weak enough to be ignored if the signal-to-noise ratio falls below 20.

Du, W.; Luo, A. L.; Zhao, Y. H., E-mail: wdu@nao.cas.cn, E-mail: lal@nao.cas.cn [National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)

2012-02-15T23:59:59.000Z

124

A spectroscopic confirmation of the Bootes II dwarf spheroidal  

E-Print Network [OSTI]

We present a new suite of photometric and spectroscopic data for the faint Bootes II dwarf spheroidal galaxy candidate. Our deep photometry, obtained with the INT/WFC, suggests a distance of 46 kpc and a small half-light radius of 4.0 arcmin (56 pc), consistent with previous estimates. Follow-up spectroscopy obtained with the Gemini/GMOS instrument yielded radial velocities and metallicities. While the majority of our targets covers a broad range in velocities and metallicities, we find five stars which share very similar velocities and metallicities and which are all compatible with the colors and magnitudes of the galaxy's likely red giant branch. We interpret these as a spectroscopic detection of the Bootes II system. These stars have a mean velocity of -117 km/s, a velocity dispersion of (10.5+-7.4) km/s and a mean [Fe/H] of -1.79 dex, with a dispersion of 0.14 dex. At this metallicity, Boo II is not consistent with the stellar-mass-metallicity relation for the more luminous dwarf galaxies. Coupled with our distance estimate, its high negative systemic velocity rules out any physical connection with its projected neighbor, the Bootes I dwarf spheroidal, which has a velocity of ~+100 km/s. The velocity and distance of Bootes II coincide with those of the leading arm of Sagittarius, which passes through this region of the sky, so that it is possible that Bootes II may be a stellar system associated with the Sagittarius stream. Finally, we note that the properties of Bootes II are consistent with being the surviving remnant of a previously larger and more luminous dSph galaxy.

A. Koch; M. I. Wilkinson; J. T. Kleyna; M. Irwin; D. B. Zucker; V. Belokurov; G. F. Gilmore; M. Fellhauer; N. W. Evans

2008-09-03T23:59:59.000Z

125

Header Sheet Doc ID Z OAK RIDGE NATIONAL LABORATORY M. E. Murray  

Office of Legacy Management (LM)

Dames & Moore Dames & Moore Header Sheet Doc ID Z OAK RIDGE NATIONAL LABORATORY M. E. Murray MANAGED BY LOCKHEED MARTIN rNERGY RESEARCH CORPORATION PHONE: (423) 574-5838 FOR THE U.S. DEPARTMENT OF ENERGY FAX: (423) POST OFFICE Box 2 INTERNET: r'0 March 31, 1997 Mr. Andrew Meloy DuPont Environmental Remediation Services DuPont Chambers Works Route 130, Anti-Knocks Building G Deepwater, New Jersey 08023 Dear Mr. Meloy: Radiological Sampling Requirements for the B Ditch Remediation Project, DuPont Chamber Works Site, Deepwater, New Jersey During the week of March 10, staff members of the Oak Ridge National Laboratory, Life Sciences Division, made surface radiation measurcments along the B ditch from 6+00' to the 11+00' markers. These measurements were performed to better define the subsurface

126

Photospheric Metals in the FUSE Spectrum of the Subdwarf B Star PG0749+658  

E-Print Network [OSTI]

We present an abundance analysis of the far-ultraviolet (905--1187 A) spectrum of the subdwarf B star PG0749+658, obtained by the Far Ultraviolet Spectroscopic Explorer (FUSE). The data have a resolution of about R = lambda / Delta lambda = 12000--15000 (20--25 km/s). We determine C, N, Si, P, S, Cr, Mn, Fe, Co, and Ni abundances, and upper limits on the abundance of Cl and V, using a grid of synthetic spectra based on a LTE stellar atmosphere model. He, C, N, Si, and Cl are depleted by a factor of >~10 with respect to solar, while P, S, and Fe are diminished by less than a factor of 10. We measure a solar abundance of Cr, Mn, and Co and a Ni enhancement of ~0.6 dex. We compare these values to predictions based on radiative levitation theory. The radial velocity of the foreground interstellar material has one dominant component, and coincides with that of the photospheric lines.

R. G. Ohl; P. Chayer; H. W. Moos

2000-06-16T23:59:59.000Z

127

Relatrio de Autoavaliao Institucional  

E-Print Network [OSTI]

Rodrigues da Costae Valdir Augusto Steinke DGP: Rodrigo Rosal Cavalcanti Santos e Rosana Fernandes Sottovia DPP Tereza do Rego Barros Luz DEG: Nilce Santos Melo e Danilo Nogueira Prata DEX: Thérèse Hofmann Gatti

Carvalho, João Luiz

128

Beamlines  

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

Two Beryllium windows, 100 m and 120 m. Distance source point - mask plane 10.35 meter. DEX 02 scanner, from Jenoptik GmbH. Micromachining II (XRLM2), Port 2B, 10 mrad...

129

Tuberville Lab Publications | Savannah River Ecology Laboratory  

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

Factor: 0.76) (PDF) Schnellbacher, R.W., S.M. Hernandez, T.D. Tuberville, J. Mayer, R.D. Arnold. 2012. Safety and utility of intranasal administration of dex-medetomidine and...

130

Tag der Chemie Technische Universitt Berlin  

E-Print Network [OSTI]

Tag der Chemie Technische Universität Berlin www.tdc-bb.de 27. 28.06.2012 Lichthof der Technischen Wirkung ­ Mit ,,Nichts" zum Chemie-Prof. 13.45 Uhr Postervorträge 14.45 Uhr Kaffeepause / Postersession 15.20 Uhr Präsentationen DexLeChem DexLeChem ­ ein universitäres Spin-Off des Instituts der Chemie der

Nabben, Reinhard

131

IN  

E-Print Network [OSTI]

I hereby declare that all information in this document has been obtained and presented in accordance with academic rules and ethical conduct. I also declare that, as required by these rules and conduct, I have fully cited and referenced all material and results that are not original to this work. iii

Prof Dr; Canan zgen; Prof Dr; Kemal I?der; Prof Dr; Tlay Ye?in

2005-01-01T23:59:59.000Z

132

Density Ratio Estimation: A Comprehensive Review Masashi Sugiyama, Tokyo Institute of Technology (sugi@cs.titech.ac.jp)  

E-Print Network [OSTI]

.i.d.) samples {xnu i }nnu i=1 from a distribution with density p nu(x) and i.i.d. samples {xde j }nde j=1 from another distribution with density p de(x). {xnu i }nnu i=1 i.i.d. p nu(x) and {xde j }nde j=1 i.i.d. p the density ratio r (x) := p nu(x) p de(x) from samples {xnu i }nnu i=1 and {xde j }nde j=1. `nu' and `de

Sugiyama, Masashi

133

TOWARD A REMOVAL OF TEMPERATURE DEPENDENCIES FROM ABUNDANCE DETERMINATIONS: NGC 628  

SciTech Connect (OSTI)

The metal content of a galaxy, a key property for distinguishing between viable galaxy evolutionary scenarios, strongly influences many of the physical processes in the interstellar medium. An absolute and robust determination of extragalactic metallicities is essential in constraining models of chemical enrichment and chemical evolution. Current gas-phase abundance determinations, however, from optical fine-structure lines are uncertain to 0.8 dex as conversion of these optical line fluxes to abundances is strongly dependent on the electron temperature of the ionized gas. In contrast, the far-infrared (far-IR) emission lines can be used to derive an O{sup ++} abundance that is relatively insensitive to temperature, while the ratio of the optical to far-IR lines provides a consistent temperature to be used in the derivation of an O{sup +} abundance. We present observations of the [O III] 88 ?m fine-structure line in NGC 628 that were obtained as part of the Key Insights on Nearby Galaxies: a Far Infared Survey with Herschel program. These data are combined with optical integrated field unit data to derive oxygen abundances for seven H II regions. We find the abundance of these regions to all lie between the high and low values of strong-line calibrations and to be in agreement with estimates that assume temperature fluctuations are present in the H II regions.

Croxall, Kevin V. [Department of Astronomy, The Ohio State University, 4051 McPherson Laboratory, 140 West 18th Avenue, Columbus, OH 43210 (United States); Smith, J. D.; Pellegrini, E. [Department of Physics and Astronomy, University of Toledo, 2801 West Bancroft Street, Toledo, OH 43606 (United States); Brandl, B. R. [Leiden Observatory, Leiden University, P.O. Box 9513, 2300-RA Leiden (Netherlands); Groves, B. A.; Kreckel, K.; Sandstrom, K. M.; Walter, F.; Schinnerer, E. [Max-Planck-Institut fur Astronomie, Knigstuhl 17, D-69117 Heidelberg (Germany); Kennicutt, R. C.; Galametz, M. [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA (United Kingdom); Johnson, B. D. [Institut d'Astrophysique de Paris, UMR7095 CNRS, Universit Pierre and Marie Curie, 98 bis Boulevard Arago, F-75014 Paris (France); Armus, L. [Spitzer Science Center, California Institute of Technology, MC 314-6, Pasadena, CA 91125 (United States); Beiro, P. [Observatoire de Paris, 61 avenue de l'Observatoire, F-75014 Paris (France); Calzetti, D. [Department of Astronomy, University of Massachusetts, Amherst, MA 01003 (United States); Dale, D. A. [Department of Physics and Astronomy, University of Wyoming, Laramie, WY 82071 (United States); Hinz, J. L. [MMT Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721 (United States); Hunt, L. K. [INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125 Firenze (Italy); Koda, J., E-mail: croxall@astronomy.ohio-state.edu [Department of Physics and Astronomy, SUNY Stony Brook, Stony Brook, NY 11794-3800 (United States)

2013-11-10T23:59:59.000Z

134

UAP56 is an important mediator of Angiotensin II/platelet derived growth factor induced vascular smooth muscle cell DNA synthesis and proliferation  

SciTech Connect (OSTI)

Highlights: ? Knockdown of UAP56 inhibits Angiotensin II/PDGF induced vascular smooth muscle cell proliferation. ? UAP56 is a positive regulator of E2F transcriptional activation. ? UAP56 is present in the vessel wall of low flow carotid arteries. -- Abstract: Angiotensin (Ang) II and platelet-derived growth factor (PDGF) are important mediators of pathologic vascular smooth muscle cell (VSMC) proliferation. Identifying downstream mediators of Ang II and PDGF signaling may provide insights for therapies to improve vascular proliferative diseases. We have previously demonstrated that breakpoint cluster region (Bcr) is an important mediator of Ang II/PDGF signaling in VSMC. We have recently reported that the DExD/H box protein UAP56 is an interacting partner of Bcr in regulating VSMC DNA synthesis. We hypothesized that UAP56 itself is an important regulator of VSMC proliferation. In this report we demonstrate that knockdown of UAP56 inhibits Ang II/PDGF induced VSMC DNA synthesis and proliferation, and inhibits E2F transcriptional activity. In addition, we demonstrate that UAP56 is present in the vessel wall of low-flow carotid arteries. These findings suggest that UAP56 is a regulator of VSMC proliferation and identify UAP56 as a target for preventing vascular proliferative disease.

Sahni, Abha [Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642 (United States) [Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642 (United States); Department of Pathology, University of Texas Medical Branch, Galveston, TX 77555 (United States); Wang, Nadan [Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642 (United States) [Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642 (United States); Center for Translational Medicine, Department of Medicine, Thomas Jefferson University, Philadelphia, PA 19107 (United States); Alexis, Jeffrey, E-mail: jeffrey_alexis@urmc.rochester.edu [Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642 (United States)] [Aab Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY 14642 (United States)

2013-02-15T23:59:59.000Z

135

On the maximum value of the cosmic abundance of oxygen and the oxygen yield  

E-Print Network [OSTI]

We search for the maximum oxygen abundance in spiral galaxies. Because this maximum value is expected to occur in the centers of the most luminous galaxies, we have constructed the luminosity - central metallicity diagram for spiral galaxies, based on a large compilation of existing data on oxygen abundances of HII regions in spiral galaxies. We found that this diagram shows a plateau at high luminosities (-22.3 oxygen abundance 12+log(O/H) ~ 8.87. This provides strong evidence that the oxygen abundance in the centers of the most luminous metal-rich galaxies reaches the maximum attainable value of oxygen abundance. Since some fraction of the oxygen (about 0.08 dex) is expected to be locked into dust grains, the maximum value of the true gas+dust oxygen abundance in spiral galaxies is 12+log(O/H) ~ 8.95. This value is a factor of ~ 2 higher than the recently estimated solar value. Based on the derived maximum oxygen abundance in galaxies, we found the oxygen yield to be about 0.0035, depending on the fraction of oxygen incorporated into dust grains.

L. S. Pilyugin; T. X. Thuan; J. M. Vilchez

2007-01-11T23:59:59.000Z

136

Ground-based observations of the beta Cephei CoRoT main target HD 180642: abundance analysis and mode identification  

E-Print Network [OSTI]

The known beta Cephei star HD 180642 was observed by the CoRoT satellite in 2007. From the very high-precision light curve, its pulsation frequency spectrum could be derived for the first time (Degroote and collaborators). In this paper, we obtain additional constraints for forthcoming asteroseismic modeling of the target. Our results are based on both extensive ground-based multicolour photometry and high-resolution spectroscopy. We determine T_eff = 24 500+-1000 K and log g = 3.45+-0.15 dex from spectroscopy. The derived chemical abundances are consistent with those for B stars in the solar neighbourhood, except for a mild nitrogen excess. A metallicity Z = 0.0099+-0.0016 is obtained. Three modes are detected in photometry. The degree l is unambiguously identified for two of them: l = 0 and l = 3 for the frequencies 5.48694 1/d and 0.30818 1/d, respectively. The radial mode is non-linear and highly dominant with an amplitude in the U-filter about 15 times larger than the strongest of the other modes. For th...

Briquet, M; Morel, T; Aerts, C; De Cat, P; Mathias, P; Lefever, K; Miglio, A; Poretti, E; Martin-Ruiz, S; Paparo, M; Rainer, M; Carrier, F; Gutirrez-Soto, J; Valtier, J C; Benko, J M; Bognr, Z; Niemczura, E; Amado, P J; Surez, J C; Moya, A; Rodriguez-Lopez, C; Garrido, R

2009-01-01T23:59:59.000Z

137

USING CUMULATIVE NUMBER DENSITIES TO COMPARE GALAXIES ACROSS COSMIC TIME  

SciTech Connect (OSTI)

Comparing galaxies across redshifts at fixed cumulative number density is a popular way to estimate the evolution of specific galaxy populations. This method ignores scatter in mass accretion histories and galaxy-galaxy mergers, which can lead to errors when comparing galaxies over large redshift ranges (?z > 1). We use abundance matching in the ?CDM paradigm to estimate the median change in cumulative number density with redshift and provide a simple fit (+0.16 dex per unit ?z) for progenitors of z = 0 galaxies. We find that galaxy descendants do not evolve in the same way as galaxy progenitors, largely due to scatter in mass accretion histories. We also provide estimates for the 1? range of cumulative number densities corresponding to galaxy progenitors and descendants. Finally, we discuss some limits on cumulative number density comparisons, which arise due to difficulties measuring physical quantities (e.g., stellar mass) consistently across redshifts. A public tool to calculate cumulative number density evolution for galaxies, as well as approximate halo masses, is available online.

Behroozi, Peter S.; Wechsler, Risa H. [Kavli Institute for Particle Astrophysics and Cosmology, SLAC National Accelerator Laboratory, Stanford, CA 94305 (United States)] [Kavli Institute for Particle Astrophysics and Cosmology, SLAC National Accelerator Laboratory, Stanford, CA 94305 (United States); Marchesini, Danilo [Department of Physics and Astronomy, Tufts University, Medford, MA 02155 (United States)] [Department of Physics and Astronomy, Tufts University, Medford, MA 02155 (United States); Muzzin, Adam [Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden (Netherlands)] [Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden (Netherlands); Papovich, Casey [Department of Physics and Astronomy, Texas A and M University, College Station, TX 77843 (United States)] [Department of Physics and Astronomy, Texas A and M University, College Station, TX 77843 (United States); Stefanon, Mauro [Physics and Astronomy Department, University of Missouri, Columbia, MO 65211 (United States)] [Physics and Astronomy Department, University of Missouri, Columbia, MO 65211 (United States)

2013-11-01T23:59:59.000Z

138

Development of rapidly fermenting strains of Saccharomyces diastaticus for direct conversion of starch and dextrins to ethanol  

SciTech Connect (OSTI)

Alcoholic fermentation, growth, and glucoamylase production by 12 strains of Saccharomyces diastaticus were compared by using starch and dextrins as substrates. Haploid progeny produced from a rapidly fermenting strain, SD2, were used for hybridization with other S. diastaticus and Saccharomyces cerevisiae haploids. Alcoholic fermentation and enzyme production by hybrid diploids and their haploid parents were evaluated. Although the dosage of the STA or DEX (starch or dextrin fermentation) genes may enhance ethanol production, epistatic effects in certain strain combinations caused decreases in starch-fermenting activity. Both the nature of the starch or dextrin used and the fermentation medium pH had substantial effects on alcohol production. Commercial dextrin was not as good a substrate as dextrins prepared by digesting starch with ..cap alpha..-amylase. Crude manioc starch digested by ..cap alpha..-amylase was fermented directly by selected hybrids with almost 100% conversion efficiency. The manioc preparation contained adequate minerals and growth factors. This procedure should be suitable for direct commercial application in manioc-producing regions in Brazil and elsewhere. A rapidly fermenting haploid strain, SD2-A8, descended from strain SD2, contains two unlinked genes controlling formation of extracellular amylase. A convenient method for detecting these genes (STA genes) in replica plates containing large numbers of meiotic progeny was developed.

Laluce, C.; Mattoon, J.R.

1984-07-01T23:59:59.000Z

139

Improved HCN/HNC linelist, model atmospheres and synthetic spectra for WZ Cas  

E-Print Network [OSTI]

We build an accurate database of 5200 HCN and HNC rotation-vibration energy levels, determined from existing laboratory data. 20~000 energy levels in the Harris et al. (2002) linelist are assigned approximate quantum numbers. These assignments, lab determined energy levels and Harris et al (2002) energy levels are incorporated in to a new energy level list. A new linelist is presented, in which frequencies are computed using the lab determined energy levels where available, and the ab initio energy levels otherwise. The new linelist is then used to compute new model atmospheres and synthetic spectra for the carbon star WZ Cas. This results in better fit to the spectrum of WZ Cas in which the absorption feature at 3.56 micron is reproduced to a higher degree of accuracy than has previously been possible. We improve the reproduction of HCN absorption features by reducing the abundance of Si to [Si/H] = --0.5 dex, however, the strengths of the $\\Delta v=2$ CS band heads are over-predicted.

G. J. Harris; J. Tennyson; B. M. Kaminsky; Ya. V. Pavlenko; H. R. A. Jones

2005-12-14T23:59:59.000Z

140

Stellar loci I. Metallicity dependence and intrinsic widths  

E-Print Network [OSTI]

Stellar loci are widely used for selection of interesting outliers, reddening determinations, and calibrations. However, hitherto the dependence of stellar loci on metallicity has not been fully explored and their intrinsic widths are unclear. In this paper, by combining the spectroscopic and re-calibrated imaging data of the SDSS Stripe 82, we have built a large, clean sample of dwarf stars with accurate colors and well determined metallicities to investigate the metallicity dependence and intrinsic widths of the SDSS stellar loci. Typically, one dex decrease in metallicity causes 0.20 and 0.02 mag decrease in colors u-g and g-r, and 0.02 and 0.02 mag increase in colors r-i and i-z, respectively. The variations are larger for metal-rich stars than for metal-poor ones, and for F/G/K stars than for A/M ones. Using the sample, we have performed two dimensional polynomial fitting to the u-g, g-r, r-i, and i-z colors as a function of color g-i and metallicity [Fe/H]. The residuals, at the level of 0.029, 0.008, 0...

Yuan, Haibo; Xiang, Maosheng; Huang, Yang; Chen, Bingqiu

2014-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "antiknock in dex" 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

Strontium: To LTE or non-LTE that is the question  

E-Print Network [OSTI]

Strontium has proven itself to be one of the most important neutron-capture elements in the study of metal-poor stars. Thanks to the strong absorption lines of Sr, they can be detected even in the most metal-poor stars and also in low-resolution spectra. However, we still cannot explain the large star-to-star abundance scatter we derive for metal-poor stars. Here we confront Galactic chemical evolution (GCE) with improved abundances for SrI+II including updated atomic data, to evaluate possible explanations for the large star-to-star scatter at low metallicities. We derive abundances under both local thermodynamic equilibrium (LTE) and non-LTE (NLTE) for stars spanning a large interval of stellar parameters. Gravities and metallicities are also determined in NLTE. We confirm that the ionisation equilibrium between SrI and SrII is satisfied under NLTE but not LTE, where the difference between SrI and SrII is on average ~0.3dex. We show that the NLTE corrections are of increasing importance as the metallicity d...

Hansen, Camilla J; Cescutti, Gabriele; Francois, Patrick; Arcones, Almudena; Karakas, Amanda I; Lind, Karin; Chiappini, Cristina

2012-01-01T23:59:59.000Z

142

Carbon and Strontium Abundances of Metal-Poor Stars  

E-Print Network [OSTI]

We present carbon and strontium abundances for 100 metal-poor stars measured from R$\\sim $7000 spectra obtained with the Echellette Spectrograph and Imager at the Keck Observatory. Using spectral synthesis of the G-band region, we have derived carbon abundances for stars ranging from [Fe/H]$=-1.3$ to [Fe/H]$=-3.8$. The formal errors are $\\sim 0.2$ dex in [C/Fe]. The strontium abundance in these stars was measured using spectral synthesis of the resonance line at 4215 {\\AA}. Using these two abundance measurments along with the barium abundances from our previous study of these stars, we show it is possible to identify neutron-capture-rich stars with our spectra. We find, as in other studies, a large scatter in [C/Fe] below [Fe/H]$ = -2$. Of the stars with [Fe/H]$<-2$, 9$\\pm$4% can be classified as carbon-rich metal-poor stars. The Sr and Ba abundances show that three of the carbon-rich stars are neutron-capture-rich, while two have normal Ba and Sr. This fraction of carbon enhanced stars is consistent with other studies that include this metallicity range.

David K. Lai; Jennifer A. Johnson; Michael Bolte; Sara Lucatello

2007-06-20T23:59:59.000Z

143

Stellar Metallicity of the Extended Disk and Distance of the Spiral Galaxy NGC 3621  

E-Print Network [OSTI]

Low resolution ESO VLT/FORS spectra of blue supergiant stars are analyzed to determine stellar metallicities (based on elements such as Fe, Ti, Mg) in the extended disk of the spiral galaxy NGC3621. Mildly subsolar metallicity (-0.30 dex) is found for the outer objects beyond 7 kpc independent of galactocentric radius and compatible with the absence of a metallicity gradient confirming the results of a recent investigation of interstellar medium HII region gas oxygen abundances. The stellar metallicities are slightly higher than those from the HII regions when based on measurements of the weak forbidden auroral oxygen line at 4363 AE but lower than the ones obtained with the R23 strong line method. It is shown that the present level of metallicity in the extended disk cannot be the result of chemical evolution over the age of the disk with the present rate of in situ star formation. Additional mechanisms must be involved. In addition to metallicity, stellar effective temperatures, gravities, interstellar redd...

Kudritzki, Rolf-Peter; Bresolin, Fabio; Hosek, Matthew W; Przybilla, Norbert

2014-01-01T23:59:59.000Z

144

In  

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

c3 c3 In 0 .2 0 P DISCLAIMER This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsi- bility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Refer- ) . ence herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recom- 5 mendation, or favoring by the United States Government or any agency thereof. The views

145

THE RAVE CATALOG OF STELLAR ELEMENTAL ABUNDANCES: FIRST DATA RELEASE  

SciTech Connect (OSTI)

We present chemical elemental abundances for 36,561 stars observed by the RAdial Velocity Experiment (RAVE), an ambitious spectroscopic survey of our Galaxy at Galactic latitudes |b| > 25 Degree-Sign and with magnitudes in the range 9 dex, as judged from accuracy tests performed on synthetic and real spectra. Abundances are estimated through a dedicated processing pipeline in which the curve of growth of individual lines is obtained from a library of absorption line equivalent widths to construct a model spectrum that is then matched to the observed spectrum via a {chi}{sup 2} minimization technique. We plan to extend this pipeline to include estimates for other elements, such as oxygen and sulfur, in future data releases.

Boeche, C.; Williams, M.; De Jong, R. S.; Steinmetz, M. [Leibniz-Institut fuer Astrophysik Potsdam (AIP), D-14482 Potsdam (Germany); Siebert, A.; Bienayme, O. [Observatoire Astronomique de Strasbourg, Universite de Strasbourg, CNRS, UMR 7550, F-67000 Strasbourg (France); Fulbright, J. P.; Ruchti, G. R. [Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218 (United States); Bland-Hawthorn, J. [Sydney Institute for Astronomy, School of Physics A28, University of Sydney, NSW 2006 (Australia); Campbell, R. [Department of Physics and Astronomy, Western Kentucky University, Bowling Green, KY (United States); Freeman, K. C. [Research School of Astronomy and Astrophysics, Australia National University, Weston Creek, Canberra ACT 2611 (Australia); Gibson, B. K. [Jeremiah Horrocks Institute, University of Central Lancashire, Preston PR1 2HE (United Kingdom); Gilmore, G. [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA (United Kingdom); Grebel, E. K. [Astronomisches Rechen-Institut, Zentrum fuer Astronomie der Universitaet Heidelberg, D-69120 Heidelberg (Germany); Helmi, A. [Kapteyn Astronomical Institute, University of Groningen, 9700 AV Groningen (Netherlands); Munari, U. [INAF Osservatorio Astronomico di Padova, Asiago I-36012 (Italy); Navarro, J. F. [Department of Physics and Astronomy, University of Victoria, Victoria BC V8W 3P6 (Canada); Parker, Q. A.; Reid, W. [Department of Physics and Astronomy, Faculty of Sciences, Macquarie University, Sydney, NSW 2109 (Australia); Seabroke, G. M. [Mullard Space Science Laboratory, University College London, Holmbury, St. Mary RH5 6NT (United Kingdom); and others

2011-12-15T23:59:59.000Z

146

Two Super-Earths Orbiting the Solar Analogue HD41248 on the edge of a 7:5 Mean Motion Resonance  

E-Print Network [OSTI]

The number of multi-planet systems known to be orbiting their host stars with orbital periods that place them in mean motion resonances is growing. For the most part, these systems are in first-order resonances and dynamical studies have focused their efforts towards understanding the origin and evolution of such dynamically resonant commensurabilities. We report here the discovery of two super-Earths that are close to a second-order dynamical resonance, orbiting the metal-poor ([Fe/H]=-0.43 dex) and inactive G2V star HD41428. We analysed 62 HARPS archival radial velocities for this star, that until now, had exhibited no evidence for planetary companions. Using our new Bayesian Doppler signal detection algorithm, we find two significant signals in the data, with periods of 18.357 days and 25.648 days, indicating they could be part of a 7:5 second-order mean motion resonance. Both semi-amplitudes are below 3m/s and the minimum masses of the pair are 12.3 and 8.6Mearth, respectively. Our simulations found that ...

Jenkins, James S; Brasser, Ramon; Ivanyuk, Oleksiy; Murgas, Felipe

2013-01-01T23:59:59.000Z

147

Impact of the new solar abundances on the calibration of the PMS binary system RS Cha  

E-Print Network [OSTI]

Context: In a recent work, we tried to obtain a calibration of the two components of the pre-main sequence binary system RS Cha by means of theoretical stellar models. We found that the only way to reproduce the observational parameters of RS Cha with standard stellar models is to decrease the initial abundances of carbon and nitrogen derived from the GN93 solar mixture of heavy elements by a few tenths of dex. Aims: In this work, we aim to reproduce the observational properties of the RS Cha stars with stellar evolution models based on the new AGS05 solar mixture recently derived from a three-dimensional solar model atmosphere. The AGS05 mixture is depleted in carbon, nitrogen and oxygen with respect to the GN93 mixture. Methods: We calculated new stellar models of the RS Cha components using the AGS05 mixture and appropriate opacity tables. We sought models that simultaneously satisfy the observations of the two components (masses, radii, luminosities, effective temperatures and metallicity). Results: We fi...

Alecian, E; Goupil, M-J; Dupret, M-A; Catala, C

2007-01-01T23:59:59.000Z

148

A MODEL ATMOSPHERE ANALYSIS OF ALPHA AURIGAE A  

SciTech Connect (OSTI)

This work presents the first quantitative composite model atmosphere analysis of Capella, the brightest near-equal-mass spectroscopic binary and principal star of the constellation Auriga. Its high-resolution spectrum leads to a slightly metal-rich object at [Fe/H] = +0.05 {+-} 0.08 dex. In line with its young age and its kinematics, this consistently associates Capella with the Hyades moving group. The measured projected rotational velocities, vsin i{sub Aa} = 3.5 {+-} 0.8 km s{sup -1} and vsin i{sub Ab} = 35.4 {+-} 3.2 km s{sup -1}, both agree with rotational and orbital coplanarity and synchronous orbital rotation for the Aa component. At an orbital period P = 104 d the primary's bound rotation together with the almost zero orbital eccentricity are both key characteristics of this binary and clearly imply that the Aa component must have passed the tip of the giant branch. Whether in that phase Capella also became a mass transfer system remains inconclusive at present, though the high rotational velocity of the less evolved Hertzsprung gap secondary and the very diverse lithium abundances of both its components render this a plausible case.

Fuhrmann, Klaus [Astronomisches Institut, Ruhr-Universitaet Bochum, Universitaetsstrasse 150, D-44780 Bochum (Germany)

2011-11-20T23:59:59.000Z

149

Deep Photometry of the Globular Cluster M5: Distance Estimates from White Dwarf and Main Sequence Stars  

E-Print Network [OSTI]

We present deep VI photometry of stars in the globular cluster M5 (NGC 5904) based on images taken with the Hubble Space Telescope. The resulting color-magnitude diagram reaches below V ~ 27 mag, revealing the upper 2-3 magnitudes of the white dwarf cooling sequence, and main sequence stars eight magnitudes and more below the turn-off. We fit the main sequence to subdwarfs of known parallax to obtain a true distance modulus of (m-M)_0 = 14.45 +/- 0.11 mag. A second distance estimate based on fitting the cluster white dwarf sequence to field white dwarfs with known parallax yielded (m-M)_0 = 14.67 +/- 0.18 mag. We couple our distance estimates with extensive photometry of the cluster's RR Lyrae variables to provide a calibration of the RR Lyrae absolute magnitude yielding M_V(RR) = 0.42 +/- 0.10 mag at [Fe/H] = -1.11 dex. We provide another luminosity calibration in the form of reddening-free Wasenheit functions. Comparison of our calibrations with predictions based on recent models combining stellar evolution and pulsation theories shows encouraging agreement. (Abridged)

Andrew C. Layden; Ata Sarajedini; Ted von Hippel; Adrienne M. Cool

2005-07-14T23:59:59.000Z

150

Neutral chlorine and molecular hydrogen at high redshift  

E-Print Network [OSTI]

Chlorine and molecular hydrogen are known to be tightly linked together in the cold phase of the local interstellar medium through rapid chemical reactions. We present here the first systematic study of this relation at high redshifts using H$_2$-bearing damped Ly$\\alpha$ systems (DLAs) detected along quasar lines of sight. Using high-resolution spectroscopic data from VLT/UVES and Keck/HIRES, we report the detection of Cl$\\,$I in 9 DLAs (including 5 new detections) out of 18 high-$z$ DLAs with $N($H$_2) \\ge 10^{17.3}\\,$cm$^{-2}$ (including a new H$_2$ detection at $z=3.09145$ towards J$\\,$2100$-$0641) and present upper limits for the remaining 9 systems. We find a $\\sim$5$\\,\\sigma$ correlation between $N$(Cl$\\,$I) and $N$(H$_2$) with only $\\sim$0.2$\\,$dex dispersion over the range 18.1$\\,<\\,$log$\\,N$(H$_2$)$\\,<\\,$20.1, thus probing column densities 10 times lower those seen towards nearby stars, roughly following the relation $N$(Cl$\\,$I$) \\approx 1.5\\times10^{-6} \\times N($H$_2)$. This relation betwee...

Balashev, S A; Klimenko, V V; Petitjean, P; Srianand, R; Ledoux, C; Ivanchik, A V; Varshalovich, D A

2015-01-01T23:59:59.000Z

151

Operators Manual and Technical Reference for the Z-Beamlet Phase Modulation Failsafe System: Version 1.  

SciTech Connect (OSTI)

The need for pulse energies exceeding 4 kJ and pulse lengths [?] 2 ns in Sandia's Z-Beamlet laser (ZBL) requires that the single-frequency spectrum of its fiber-laser master oscillator be converted to a phase modulated spectrum with a modulation in dex [?] 5. Because accidental injection of single-frequency light into ZBL could result i n damage to optical materials from transverse stimulated Brillouin scattering, the presence of phase modulated (PM) light must be monitored by a reliable failsafe system that can stop a las er shot within of a few 10's of ns following a failure of the PM system. This requirement is met by combining optical heterodyne detection with high-speed electronics to indicate the pres ence or absence of phase modulated light. The transition time for the failsafe signal resultin g from a sudden failure using this technique is approximately 35 ns. This is sufficiently short to safely stop a single-frequency laser pulse from leaving ZBL's regenerative amplifier with a n approximately 35 ns margin of safety. This manual and technical reference contains detai led instructions for daily use of the PM failsafe system and provides enough additional informat ion for its maintenance and repair.

Armstrong, Darrell J.

2014-09-01T23:59:59.000Z

152

Stroemgren - near-infrared photometry of the Baade's Window. I. The bulge globular cluster NGC6528 and the surrounding field  

E-Print Network [OSTI]

We present Stroemgren-NIR photometry of NGC6528 and its surroundings in the Baade's Window. uvby images were collected with EFOSC2@NTT, while NIR catalogs are based on VIRCAM@VISTA and SOFI@NTT data. The matching with HST photometry allowed us to obtain proper-motion-cleaned samples of cluster and bulge stars. The huge color sensitivity of Stroemgren-NIR CMDs helped us in disentangling age and metallicity effects. The RGB of NGC6528 is reproduced by scaled-solar isochrones with solar abundance or alpha-enhanced isochrones with the same iron content, and an age of t = 11+/-1 Gyr. These findings support literature age estimates for NGC6528. We also performed a theoretical metallicity calibration based on the Stroemgren index m1 and on visual-NIR colors for RGs, by adopting scaled-solar and alpha-enhanced models. We applied the calibration to estimate the metallicity of NGC6528, finding [Fe/H] = -0.04+/-0.02, with an intrinsic dispersion of 0.27 dex (by averaging abundances based on the scaled-solar [m], y - J a...

Calamida, Annalisa; Lagioia, Edoardo P; Milone, Antonino P; Fabrizio, Michele; Saviane, Ivo; Bidin, Christian Moni; Mauro, Francesco; Buonanno, Roberto; Ferraro, Ivan; Iannicola, Giacinto; Zoccali, Manuela

2014-01-01T23:59:59.000Z

153

On the solar nickel and oxygen abundances  

E-Print Network [OSTI]

Determinations of the solar oxygen content relying on the neutral forbidden transition at 630 nm depend upon the nickel abundance, due to a Ni I blend. Here we rederive the solar nickel abundance, using the same ab initio 3D hydrodynamic model of the solar photosphere employed in the recent revision of the abundances of C, N, O and other elements. Using 17 weak, unblended lines of Ni I together with the most accurate atomic and observational data available we find log epsilon_Ni = 6.17 +/- 0.02 (statistical) +/- 0.05 (systematic), a downwards shift of 0.06 to 0.08 dex relative to previous 1D-based abundances. We investigate the implications of the new nickel abundance for studies of the solar oxygen abundance based on the [O I] 630 nm line in the quiet Sun. Furthermore, we demonstrate that the oxygen abundance implied by the recent sunspot spectropolarimetric study of Centeno & Socas-Navarro needs to be revised downwards from log epsilon_O = 8.86 +/- 0.07 to 8.71 +/- 0.10. This revision is based on the new nickel abundance, application of the best available gf-value for the 630 nm forbidden oxygen line, and a more transparent treatment of CO formation. Determinations of the solar oxygen content relying on forbidden lines now appear to converge around log epsilon_O = 8.7.

Pat Scott; Martin Asplund; Nicolas Grevesse; A. Jacques Sauval

2008-11-05T23:59:59.000Z

154

Revisiting the relationship between 6 {\\mu}m and 2-10 keV continuum luminosities of AGN  

E-Print Network [OSTI]

We have determined the relation between the AGN luminosities at rest-frame 6 {\\mu}m associated to the dusty torus emission and at 2-10 keV energies using a complete, X-ray flux limited sample of 232 AGN drawn from the Bright Ultra-hard XMM-Newton Survey. The objects have X-ray luminosities corrected for intrinsic absorption between 10^42 and 10^46 erg/s and redshifts from 0.05 to 2.8. The rest-frame 6 {\\mu}m luminosities were computed using data from the Wide-Field Infrared Survey Explorer and are based on a spectral energy distribution decomposition into AGN and galaxy emission. The best-fit relationship for the full sample is consistent with being linear, L_6 {\\mu}m $\\propto$ L_2-10 keV^0.99$\\pm$0.032, but has significant intrinsic scatter, ~0.35 dex in log L_6 {\\mu}m. Assuming a constant X-ray bolometric correction, the fraction of AGN bolometric luminosity reprocessed in the mid-IR decreases weakly, if at all, with the AGN luminosity, a finding at odds with simple receding torus models. Type 2 AGN have re...

Mateos, S; Alonso-Herrero, A; Rovilos, E; Hernn-Caballero, A; Barcons, X; Blain, A; Caccianiga, A; Della Ceca, R; Severgnini, P

2015-01-01T23:59:59.000Z

155

A Relationship Between Nuclear Black Hole Mass and Galaxy Velocity Dispersion  

E-Print Network [OSTI]

We describe a correlation between the mass M_BH of a galaxy's central black hole and the luminosity-weighted line-of-sight velocity dispersion sigma_e within the half-light radius. The result is based on a sample of 26 galaxies, including 13 galaxies with new determinations of black hole masses from Hubble Space Telescope measurements of stellar kinematics. The best-fit correlation is M_BH = 1.2 (+-0.2) x 10^8 M_sun (sigma_e/200 km/s)^(3.75 (+-0.3))over almost three orders of magnitude in M_BH; the scatter in M_BH at fixed sigma_e is only 0.30 dex and most of this is due to observational errors. The M_BH-sigma_e relation is of interest not only for its strong predictive power but also because it implies that central black hole mass is constrained by and closely related to properties of the host galaxy's bulge.

Karl Gebhardt; Ralf Bender; Gary Bower; Alan Dressler; S. M. Faber; Alexei V. Filippenko; Richard Green; Carl Grillmair; Luis C. Ho; John Kormendy; Tod R. Lauer; John Magorrian; Jason Pinkney; Douglas Richstone; Scott Tremaine

2000-06-20T23:59:59.000Z

156

The GAPS Programme with HARPS-N@TNG V. A comprehensive analysis of the XO-2 stellar and planetary systems  

E-Print Network [OSTI]

XO-2 is the first confirmed wide stellar binary system where the almost twin components XO-2N and XO-2S have planets. This stimulated a detailed characterization study of the stellar and planetary components based on new observations. We collected high-resolution spectra with the HARPS-N spectrograph and multi-band light curves. Spectral analysis led to an accurate determination of the stellar atmospheric parameters and characterization of the stellar activity. We collected 14 transit light curves of XO-2Nb used to improve the transit parameters. Photometry provided accurate magnitude differences between the stars and a measure of their rotation periods. The iron abundance of XO-2N was found to be +0.054 dex greater, within more than 3-sigma, than that of XO-2S. We confirm a long-term variation in the radial velocities of XO-2N, and we detected a turn-over with respect to previous measurements. We suggest the presence of a second massive companion in an outer orbit or the stellar activity cycle as possible ca...

Damasso, M; Bonomo, A S; Desidera, S; Lanza, A F; Nascimbeni, V; Esposito, M; Scandariato, G; Sozzetti, A; Cosentino, R; Gratton, R; Malavolta, L; Rainer, M; Gandolfi, D; Poretti, E; Sanchez, R Zanmar; Ribas, I; Santos, N; Affer, L; Andreuzzi, G; Barbieri, M; Bedin, L R; Benatti, S; Bernagozzi, A; Bertolini, E; Bonavita, M; Borsa, F; Borsato, L; Boschin, W; Calcidese, P; Carbognani, A; Cenadelli, D; Christille, J M; Claudi, R U; Covino, E; Cunial, A; Giacobbe, P; Granata, V; Harutyunyan, A; Lattanzi, M G; Leto, G; Libralato, M; Lodato, G; Lorenzi, V; Mancini, L; Fiorenzano, A F Martinez; Marzari, F; Masiero, S; Micela, G; Molinari, E; Molinaro, M; Munari, U; Murabito, S; Pagano, I; Pedani, M; Piotto, G; Rosenberg, A; Silvotti, R; Southworth, J

2015-01-01T23:59:59.000Z

157

Inverting Color-Magnitude Diagrams to Access Precise Star Cluster Parameters: A Bayesian Approach  

E-Print Network [OSTI]

We demonstrate a new Bayesian technique to invert color-magnitude diagrams of main sequence and white dwarf stars to reveal the underlying cluster properties of age, distance, metallicity, and line-of-sight absorption, as well as individual stellar masses. The advantages our technique has over traditional analyses of color-magnitude diagrams are objectivity, precision, and explicit dependence on prior knowledge of cluster parameters. Within the confines of a given set of often-used models of stellar evolution, the initial-final mass relation, and white dwarf cooling, and assuming photometric errors that one could reasonably achieve with the Hubble Space Telescope, our technique yields exceptional precision for even modest numbers of cluster stars. For clusters with 50 to 400 members and one to a few dozen white dwarfs, we find typical internal errors of sigma([Fe/H]) <= 0.03 dex, sigma(m-M) <= 0.02 mag, and sigma(Av) <= 0.01 mag. We derive cluster white dwarf ages with internal errors of typically only 10% for clusters with only three white dwarfs and almost always <= 5% with ten white dwarfs. These exceptional precisions will allow us to test white dwarf cooling models and standard stellar evolution models through observations of white dwarfs in open and globular clusters.

Ted von Hippel; William H. Jefferys; James Scott; Nathan Stein; D. E. Winget; Steven DeGennaro; Albert Dam; Elizabeth Jeffery

2006-03-17T23:59:59.000Z

158

Planetary Companions Around Two Solar Type Stars: HD 195019 and HD 217107  

E-Print Network [OSTI]

We have enlarged the sample of stars in the planet search at Lick Observatory. Doppler measurements of 82 new stars observed at Lick Observatory, with additional velocities from Keck Observatory, have revealed two new planet candidates. The G3V/IV star, HD 195019, exhibits Keplerian velocity variations with a period of 18.27 d, an orbital eccentricity of 0.03 +/- 0.03, and M sin i = 3.51 M_Jup. Based on a measurement of Ca II H&K emission, this star is chromospherically inactive. We estimate the metallicity of HD 195019 to be approximately solar from ubvy photometry. The second planet candidate was detected around HD 217107, a G7V star. This star exhibits a 7.12 d Keplerian period with eccentricity 0.14 +/- 0.05 and M sin i = 1.27 M_Jup. HD 217107 is also chromospherically inactive. The photometric metallicity is found to be [Fe/H] = +0.29 +/- 0.1 dex. Given the relatively short orbital period, the absence of tidal spin-up of HD 217107 provides a theoretical constraint on the upper limit of the companion mass of < 11 M_Jup.

D. A. Fischer; G. W. Marcy; R. P. Butler; S. S. Vogt; K. Apps

1998-10-26T23:59:59.000Z

159

CALIBRATING C-IV-BASED BLACK HOLE MASS ESTIMATORS  

SciTech Connect (OSTI)

We present the single-epoch black hole mass estimators based on the C IV {lambda}1549 broad emission line, using the updated sample of the reverberation-mapped active galactic nuclei and high-quality UV spectra. By performing multi-component spectral fitting analysis, we measure the C IV line widths (FWHM{sub C{sub IV}} and line dispersion, {sigma}{sub C{sub IV}}) and the continuum luminosity at 1350 A (L{sub 1350}) to calibrate the C-IV-based mass estimators. By comparing with the H{beta} reverberation-based masses, we provide new mass estimators with the best-fit relationships, i.e., M{sub BH}{proportional_to}L{sub 1350}{sup 0.50{+-}0.07}{sigma}{sub C{sub IV}{sup 2}} and M{sub BH}{proportional_to}L{sub 1350}{sup 0.52{+-}0.09} FWHM{sub C{sub IV}{sup 0.56{+-}0.48}}. The new C-IV-based mass estimators show significant mass-dependent systematic difference compared to the estimators commonly used in the literature. Using the published Sloan Digital Sky Survey QSO catalog, we show that the black hole mass of high-redshift QSOs decreases on average by {approx}0.25 dex if our recipe is adopted.

Park, Daeseong; Woo, Jong-Hak; Shin, Jaejin [Astronomy Program, Department of Physics and Astronomy, Seoul National University, Seoul 151-742 (Korea, Republic of); Denney, Kelly D., E-mail: pds2001@astro.snu.ac.kr, E-mail: woo@astro.snu.ac.kr, E-mail: jjshin@astro.snu.ac.kr, E-mail: kelly@dark-cosmology.dk [Dark Cosmology Centre, Niels Bohr Institute, Juliane Maries Vej 30, DK-2100 Copenhagen O (Denmark)

2013-06-20T23:59:59.000Z

160

X-Ray Crystallographic and Mutational Studies of Fluoroacetate Dehalogenase from Burkholderia sp. Strain FA1  

Science Journals Connector (OSTI)

...washed with the standard buffer, the enzyme...12). The standard assay mixture...serum albumin as a standard. Crystallization...were determined by measuring the amount of chloride...determined the three-dimensional structure of FAc-DEX...of the subunit interface was calculated...

Keiji Jitsumori; Rie Omi; Tatsuo Kurihara; Atsushi Kurata; Hisaaki Mihara; Ikuko Miyahara; Ken Hirotsu; Nobuyoshi Esaki

2009-02-13T23:59:59.000Z

Note: This page contains sample records for the topic "antiknock in dex" from the National Library of EnergyBeta (NLEBeta).
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they are not comprehensive nor are they the most current set.
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to obtain the most current and comprehensive results.


161

Spectroscopic study of the open cluster NGC 6811  

Science Journals Connector (OSTI)

......Max-Planck-Institute for Astrophysics, Karl-Schwarzschild-Str. 1, D-85741 Garching, Germany...Hectochelle spectrograph at the Multiple Mirror Telescope and classified 139 of them...Hectochelle spectrograph on the Multiple Mirror Telescope, through 0.19 dex, derived......

J. Molenda-Zakowicz; K. Brogaard; E. Niemczura; M. Bergemann; A. Frasca; T. Arentoft; F. Grundahl

2014-01-01T23:59:59.000Z

162

CALIBRATING THE STAR FORMATION RATE AT z {approx} 1 FROM OPTICAL DATA  

SciTech Connect (OSTI)

We present a star formation rate (SFR) calibration based on optical data that is consistent with average observed rates in both the red and blue galaxy populations at z {approx} 1. The motivation for this study is to calculate SFRs for DEEP2 Redshift Survey galaxies in the 0.7 < z < 1.4 redshift range, but our results are generally applicable to similar optically selected galaxy samples without requiring UV or IR data. Using SFR fits from UV/optical spectral energy distributions (SEDs) in the All-Wavelength Extended Groth Strip International Survey, we explore the behavior of rest-frame B-band magnitude, observed [O II] luminosity, and rest-frame color with SED-fit SFR for both red sequence and blue cloud galaxies. The resulting SFR calibration is based on three optical-band observables: M{sub B} , (U - B), and (B - V). The best-fit linear relation produces residual errors of 0.3 dex rms scatter for the full color-independent sample with minimal correlated residual error in L[O II] or stellar mass. We then compare the calibrated z {approx} 1 SFRs to two diagnostics that use L[O II] as a tracer in local galaxies and correct for dust extinction at intermediate redshifts through either galaxy B-band luminosity or stellar mass. We find that an L[O II]-M{sub B} SFR calibration commonly used in the literature agrees well with our calculated SFRs after correcting for the average B-band luminosity evolution in L{sub *} galaxies. However, we find better agreement with a local L[O II]-based SFR calibration that includes stellar mass to correct for reddening effects, indicating that stellar mass is a better tracer of dust extinction for all galaxy types and less affected by systematic evolution than galaxy luminosity from z = 1 to the current epoch.

Mostek, Nick [Space Sciences Laboratory, University of California, Berkeley, CA 94720 (United States); Coil, Alison L.; Moustakas, John [Center for Astrophysics and Space Sciences, University of California, San Diego, La Jolla, CA 92093 (United States); Salim, Samir [Department of Astronomy, Indiana University, Bloomington, IN 47405 (United States); Weiner, Benjamin J., E-mail: njmostek@lbl.gov [Steward Observatory, Department of Astronomy, University of Arizona, Tucson, AZ 85721 (United States)

2012-02-20T23:59:59.000Z

163

A NEW DISTANCE TO M33 USING BLUE SUPERGIANTS AND THE FGLR METHOD  

SciTech Connect (OSTI)

The quantitative spectral analysis of medium resolution optical spectra of A and B supergiants obtained with DEIMOS and ESI at the Keck Telescopes is used to determine a distance modulus of 24.93 +- 0.11 mag (968 +- 50 kpc) for the Triangulum Galaxy M33. The analysis yields stellar effective temperatures, gravities, interstellar reddening, and extinction, the combination of which provides a distance estimate via the flux-weighted gravity-luminosity relationship (FGLR). This result is based on an FGLR calibration that is continually being polished. An average reddening of (E(B - V)) approx 0.08 mag is found, with a large variation ranging from 0.01 to 0.16 mag, however, demonstrating the importance of accurate individual reddening measurements for stellar distance indicators in galaxies with evident signatures of interstellar absorption. The large-distance modulus found is in good agreement with recent work on eclipsing binaries, planetary nebulae, long-period variables, RR Lyrae stars, and also with Hubble Space Telescope (HST) observations of Cepheids, if reasonable reddening assumptions are made for the Cepheids. Since distances based on the tip of the red giant branch (TRGB) method found in the literature give conflicting results, we have used HST Advanced Camera for Surveys V- and I-band images of outer regions of M33 to determine a TRGB distance of 24.84 +- 0.10 mag, in basic agreement with the FGLR result. We have also determined stellar metallicities and discussed the metallicity gradient in the disk of M33. We find metallicity of Z {sub sun} at the center and 0.3 Z {sub sun} in the outskirts at a distance of one isophotal radius. The average logarithmic metallicity gradient is -0.07 +- 0.01 dex kpc{sup -1}. However, there is a large scatter around this average value, very similar to what has been found for the H II regions in M33.

U, Vivian; Urbaneja, Miguel A.; Kudritzki, Rolf-Peter; Jacobs, Bradley A.; Bresolin, Fabio [Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States); Przybilla, Norbert, E-mail: vivian@ifa.hawaii.ed, E-mail: urbaneja@ifa.hawaii.ed, E-mail: kud@ifa.hawaii.ed, E-mail: bjacobs@ifa.hawaii.ed, E-mail: bresolin@ifa.hawaii.ed, E-mail: przybilla@sternwarte.uni-erlangen.d [Dr. Remeis-Sternwarte Bamberg, Sternwartstrasse 7, D-96049 Bamberg (Germany)

2009-10-20T23:59:59.000Z

164

The Stellar Population Histories of Local Early-Type Galaxies. I. Population Parameters  

E-Print Network [OSTI]

We present single stellar population (SSP) equivalent ages, metallicities, and abundance ratios for local elliptical galaxies derived from Hbeta, Mgb, and absorption line strengths. We use an extension of the Worthey (1994) stellar population models that incorporates non-solar line-strength "response functions" by Tripicco & Bell (1995), allowing us to correct the models for the enhancements of Mg and other alpha-like elements relative to the Fe-peak elements. SSP-equivalent ages of local ellipticals from Gonzalez (1993) are found to vary widely, 1.5 =+0.26 and =+0.20 (in an aperture of radius Re/8). The enhancement ratios are milder than previous estimates, owing to the application of non-solar abundance corrections to both Mgb and for the first time. Gradients in stellar populations within galaxies are found to be mild, with SSP-equivalent age decreasing by 25%, metallicity decreasing by =0.20 dex, and [E/Fe] remaining nearly constant out to an aperture of radius Re/2 for nearly all systems. Our ages have an overall zeropoint uncertainty of at least 25% due to uncertainties in the stellar evolution prescription, the oxygen abundance, the effect of non-solar abundances on the isochrones, and other unknowns. However, the relative age rankings of stellar populations should be largely unaffected by these errors. In particular, the large spread in ages appears to be real and cannot be explained by contamination of Hbeta by blue stragglers or hot horizontal branch stars, or by fill-in of Hbeta by emission. Correlations between these derived SSP-equivalent parameters and other galaxy observables will be discussed in future papers. (Abridged)

S. C. Trager; S. M. Faber; Guy Worthey; J. Jesus Gonzalez

2000-01-06T23:59:59.000Z

165

The Solar Heavy Element Abundances: II. Constraints from Stellar Atmospheres  

E-Print Network [OSTI]

Estimates of the bulk metal abundance of the Sun derived from the latest generation of model atmospheres are significantly lower than the earlier standard values. In Paper I we demonstrated that a low solar metallicity is inconsistent with helioseismology if the quoted errors in the atmospheres models (of order 0.05 dex) are correct. In this paper we undertake a critical analysis of the solar metallicity and its uncertainty from a model atmospheres perspective, focusing on CNO. We argue that the non-LTE corrections for abundances derived from atomic features are overestimated in the recent abundance studies, while systematic errors in the absolute abundances are underestimated. If we adopt the internal consistency between different indicators as a measure of goodness of fit, we obtain intermediate abundances [C/H] = 8.44 +/- 0.06, [N/H] = 7.96 +/- 0.10 and [O/H] = 8.75 +/- 0.08. The errors are too large to conclude that there is a solar abundance problem, and permit both the high and low scales. However, the center-to-limb continuum flux variations predicted in the simulations appear to be inconsistent with solar data, which would favor the traditional thermal structure and lead to high CNO abundances of (8.52, 7.96, 8.80) close to the seismic scale. We argue that further empirical tests of non-LTE corrections and the thermal structure are required for precise absolute abundances. The implications for beryllium depletion and possible sources of error in the numerical simulations are discussed.

M. H. Pinsonneault; Franck Delahaye

2006-06-04T23:59:59.000Z

166

THE ASSEMBLY HISTORY OF DISK GALAXIES. I. THE TULLY-FISHER RELATION TO z {approx_equal} 1.3 FROM DEEP EXPOSURES WITH DEIMOS  

SciTech Connect (OSTI)

We present new measures of the evolving scaling relations between stellar mass, luminosity and rotational velocity for a morphologically inclusive sample of 129 disk-like galaxies with z{sub AB} < 22.5 in the redshift range 0.2 in determining characteristic rotational velocities for each galaxy. Rotation curves are reliably traced to the radius where they begin to flatten for {approx}90% of our sample, and we model the HST-resolved bulge and disk components in order to accurately de-project our measured velocities, accounting for seeing and dispersion. We demonstrate the merit of these advances by recovering an intrinsic scatter on the stellar mass Tully-Fisher relation a factor of two to three less than in previous studies at intermediate redshift and comparable to that of locally determined relations. With our increased precision, we find that the relation is well established by (z) {approx} 1, with no significant evolution to (z) {approx} 0.3, {Delta}M{sub *} {approx} 0.04 {+-} 0.07 dex. A clearer trend of evolution is seen in the B-band Tully-Fisher relation corresponding to a decline in luminosity of {Delta}M{sub B} {approx} 0.85 {+-} 0.28 magnitudes at fixed velocity over the same redshift range, reflecting the changes in star formation over this period. As an illustration of the opportunities possible when gas masses are available for a sample such as ours, we show how our dynamical and stellar mass data can be used to evaluate the likely contributions of baryons and dark matter to the assembly history of spiral galaxies.

Miller, Sarah H.; Sullivan, Mark [Oxford Astrophysics, Oxford, OX1 3RH (United Kingdom); Bundy, Kevin [Astronomy Department, University of California, Berkeley, CA 94720 (United States); Ellis, Richard S. [California Institute of Technology, Pasadena, CA 91125 (United States); Treu, Tommaso, E-mail: s.miller1@physics.ox.ac.uk [UC Santa Barbara Physics, Santa Barbara, CA 93106 (United States)

2011-11-10T23:59:59.000Z

167

RE-EXAMINING HIGH ABUNDANCE SLOAN DIGITAL SKY SURVEY MASS-METALLICITY OUTLIERS: HIGH N/O, EVOLVED WOLF-RAYET GALAXIES?  

SciTech Connect (OSTI)

We present new MMT spectroscopic observations of four dwarf galaxies representative of a larger sample observed by the Sloan Digital Sky Survey and identified by Peeples et al. as low-mass, high oxygen abundance outliers from the mass-metallicity relation. Peeples showed that these four objects (with metallicity estimates of 8.5 {<=} 12 + log(O/H) {<=} 8.8) have oxygen abundance offsets of 0.4-0.6 dex from the M{sub B} luminosity-metallicity relation. Our new observations extend the wavelength coverage to include the [O II] {lambda}{lambda}3726, 3729 doublet, which adds leverage in oxygen abundance estimates and allows measurements of N/O ratios. All four spectra are low excitation, with relatively high N/O ratios (N/O {approx}> 0.10), each of which tend to bias estimates based on strong emission lines toward high oxygen abundances. These spectra all fall in a regime where the 'standard' strong-line methods for metallicity determinations are not well calibrated either empirically or by photoionization modeling. By comparing our spectra directly to photoionization models, we estimate oxygen abundances in the range of 7.9 {<=} 12 + log (O/H) {<=} 8.4, consistent with the scatter of the mass-metallicity relation. We discuss the physical nature of these galaxies that leads to their unusual spectra (and previous classification as outliers), finding their low excitation, elevated N/O, and strong Balmer absorption are consistent with the properties expected from galaxies evolving past the 'Wolf-Rayet galaxy' phase. We compare our results to the 'main' sample of Peeples and conclude that they are outliers primarily due to enrichment of nitrogen relative to oxygen and not due to unusually high oxygen abundances for their masses or luminosities.

Berg, Danielle A.; Skillman, Evan D. [Department of Astronomy, University of Minnesota, 116 Church Street SE, Minneapolis, MN 55455 (United States); Marble, Andrew R., E-mail: berg@astro.umn.edu, E-mail: skillman@astro.umn.edu, E-mail: amarble@nso.edu [Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721 (United States)

2011-09-01T23:59:59.000Z

168

DIAGNOSING THE TIME DEPENDENCE OF ACTIVE REGION CORE HEATING FROM THE EMISSION MEASURE. II. NANOFLARE TRAINS  

SciTech Connect (OSTI)

The time dependence of heating in solar active regions can be studied by analyzing the slope of the emission measure distribution coolward of the peak. In a previous study we showed that low-frequency heating can account for 0% to 77% of active region core emission measures. We now turn our attention to heating by a finite succession of impulsive events for which the timescale between events on a single magnetic strand is shorter than the cooling timescale. We refer to this scenario as a 'nanoflare train' and explore a parameter space of heating and coronal loop properties with a hydrodynamic model. Our conclusions are (1) nanoflare trains are consistent with 86% to 100% of observed active region cores when uncertainties in the atomic data are properly accounted for; (2) steeper slopes are found for larger values of the ratio of the train duration {Delta} {sub H} to the post-train cooling and draining timescale {Delta} {sub C}, where {Delta} {sub H} depends on the number of heating events, the event duration and the time interval between successive events ({tau} {sub C}); (3) {tau} {sub C} may be diagnosed from the width of the hot component of the emission measure provided that the temperature bins are much smaller than 0.1 dex; (4) the slope of the emission measure alone is not sufficient to provide information about any timescale associated with heating-the length and density of the heated structure must be measured for {Delta} {sub H} to be uniquely extracted from the ratio {Delta} {sub H}/{Delta} {sub C}.

Reep, J. W.; Bradshaw, S. J. [Department of Physics and Astronomy, Rice University, Houston, TX 77005 (United States)] [Department of Physics and Astronomy, Rice University, Houston, TX 77005 (United States); Klimchuk, J. A., E-mail: jeffrey.reep@rice.edu, E-mail: stephen.bradshaw@rice.edu, E-mail: james.a.klimchuk@nasa.gov [NASA Goddard Space Flight Center, Solar Physics Lab., Code 671, 8800 Greenbelt Road, Greenbelt, MD 20771 (United States)

2013-02-20T23:59:59.000Z

169

Universidade de Braslia Relatrio Anual de Gesto  

E-Print Network [OSTI]

Comunicação Social ACS Rodrigo Caetano Auditoria AUD José Avelar dos Santos Centro de Planejamento CEPLAN Ribeiro ­ Secretário do DEX Profa. Maria Angela G. Feitosa ­ Diretora do IP Profa. Nilce Santos de Melo Felipe Tarelho ­ Decano de Assuntos Comunitários Rogério Luiz Alves dos Santos ­ Coordenador de Análise

Maier, Rudolf Richard

170

MEMBROS DO CONSUNI (atualizada em 23/5/2014)  

E-Print Network [OSTI]

(DPP) 04 Mauro Luiz Rabelo Decano (DEG) 05 Thérèse Hofmann Gatti R. da Costa Decana (DEX) 06 Denise.10.16 Verônica Moreira Amado Vice-Diretor 18.12.12 a 17.12.16 19 Maria Fátima de Sousa Diretora (FS) 16-Diretora (IB) 01/03/14 a 28/03/18 22 Sadi Dal Rosso Diretor (ICS) 08.12.12 a 07.12.16 Carlos Emanuel Manzolillo

Maier, Rudolf Richard

171

Comisso Prpria de Avaliao Relatrio deAutoavaliao Institucional  

E-Print Network [OSTI]

Finanças (DAF) Profa. Gardênia da Silva Abbad Decana de Gestão de Pessoas (DGP) Prof. Mauro Luiz Rabelo Extensão (DEX) Prof. Carlos Alberto Müller Lima Torres Decano de Planejamento e Orçamento (DPO) #12 Geraldo de Sousa Junior (Reitor ­ Presidente) Prof. José Américo Soares Garcia (Decano de Ensino de

Maier, Rudolf Richard

172

The Dark Energy Survey: Prospects for Resolved Stellar Populations  

Science Journals Connector (OSTI)

Wide angle and deep surveys, regardless of their primary purpose, always sample a large number of stars in the Galaxy and in its satellite system. Here we make a forecast of the expected stellar sample resulting from the Dark Energy Survey (DES) and the perspectives that it will open for studies of Galactic structure and resolved stellar populations in general. An estimated 1.2 ? 108 stars will be sampled in DES grizY filters in the southern equatorial hemisphere. This roughly corresponds to 20% of all DES sources. Most of these stars belong to the stellar thick disk and halo of the Galaxy. DES will probe low-mass stellar and sub-stellar objects at depths from three to eight times larger than those in the Sloan Digital Sky Survey (SDSS). The faint end of the main sequence (MS) will be densely sampled beyond 10kpc. The slope of the low mass end of the stellar initial mass function (IMF) will be constrained to within a few hundredths of dex, even in the thick disk and halo. In the sub-stellar mass regime, the IMF slope will be potentially constrained to within dlog (m)/dlog m 0.1. About 3 ? 104 brown dwarf candidates and at least 7.6 ? 105 white dwarf candidates will be selected, the latter embedded into the thick disk and halo, for future follow-up. The stellar halo flattening will also be constrained to within a few percent. DES will probe the MS of new Milky Way satellites and halo clusters for distances out to 120kpc, therefore yielding stellar surface density contrasts 1.6-1.7 times larger than those attainable with SDSS. It will also allow detection of these objects in the far reaches of the stellar halo, substantially increasing the number and quality of probes to the Galactic potential. Combined with northern samples, such as the SDSS, the DES stellar sample will yield constraints on the structure and stellar populations of Galactic components in unprecedented detail. In particular, the combined sample from both hemispheres will allow detailed studies of halo and thick disk asymmetries and triaxiality.

Bruno M. Rossetto; Baslio X. Santiago; Lo Girardi; Julio I. B. Camargo; Eduardo Balbinot; Luiz N. da Costa; Brian Yanny; Marcio A. G. Maia; Martin Makler; Ricardo L. C. Ogando; Paulo S. Pellegrini; Beatriz Ramos; Fernando de Simoni; R. Armstrong; E. Bertin; S. Desai; N. Kuropatkin; H. Lin; J. J. Mohr; D. L. Tucker

2011-01-01T23:59:59.000Z

173

THE SOLAR HEAVY ELEMENT ABUNDANCES. II. CONSTRAINTS FROM STELLAR ATMOSPHERES  

SciTech Connect (OSTI)

Estimates of the bulk metal abundance of the Sun derived from the latest generation of model atmospheres are significantly lower than the earlier standard values. In Paper I, we demonstrated that helioseismic data combined with stellar interiors theory set strong bounds on the solar metal abundance. The seismically derived abundances are inconsistent with the low photospheric abundances if the quoted errors in the atmospheric models (of order 0.05 dex) are correct. In this paper, we undertake a critical analysis of the solar metallicity and its uncertainty from a model atmospheric perspective, focusing on CNO. We argue that the non-LTE (NLTE) corrections for abundances derived from atomic features are overestimated in the recent abundance studies, while systematic errors in the absolute abundances are underestimated. In general, abundances derived from molecular features are lower than those derived from atomic features for the three-dimensional hydro models, while a weaker trend in the opposite direction tends to hold for abundances derived from one-dimensional models. If we adopt the internal consistency between different indicators as a measure of goodness of fit, we obtain intermediate abundances [C/H] = 8.44 +- 0.06, [N/H] = 7.96 +- 0.10 and [O/H] = 8.75 +- 0.08. The errors reflect the fact that both the high and low scales are internally consistent within the errors, and they are too large to conclude that there is a solar abundance problem. However, the center-to-limb continuum flux variations predicted in the simulations appear to be inconsistent with solar data based on recently published work. This would favor the traditional thermal structure and lead to high CNO abundances of (8.52, 7.96, 8.80) close to the seismic scale. We argue that further empirical tests of NLTE corrections and the thermal structure are required for precise absolute abundances. The sensitivity of the simulations to spatial resolution and systematic errors in the underlying atmospheric physics should also be examined, and these effects may lead to an overestimate of the impact of convective overshooting on the thermal structure of the outer layers of the solar atmosphere. The uncertainties in the solar oxygen also imply that strong conclusions about the absence of solar beryllium depletion cannot be made.

Pinsonneault, M. H. [Department of Astronomy, Ohio State University, Columbus, OH 43210 (United States); Delahaye, Franck [CEA, IRFU, Serv. Astrophys., F-91191 Gif-sur-Yvette (France)

2009-10-20T23:59:59.000Z

174

THE STELLAR POPULATION AND STAR FORMATION RATES OF z Almost-Equal-To 1.5-1.6 [O II]-EMITTING GALAXIES SELECTED FROM NARROWBAND EMISSION-LINE SURVEYS  

SciTech Connect (OSTI)

We present the first detailed study of the stellar populations of star-forming galaxies at z {approx} 1.5, which are selected by their [O II] emission line, detected in narrowband surveys. We identified {approx}1300 [O II] emitters at z = 1.47 and z = 1.62 in the Subaru Deep Field with rest-frame equivalent widths (EWs) above 13 A. Optical and near-infrared spectroscopic observations for Almost-Equal-To 10% of our samples show that our separation of [O II] from [O III] emission-line galaxies in two-color space is 99% successful. We analyze the multi-wavelength properties of a subset of {approx}1200 galaxies with the best photometry. They have average rest-frame EW of 45 A, stellar mass of 3 Multiplication-Sign 10{sup 9} M{sub Sun }, and stellar age of 100 Myr. In addition, our spectral energy distribution (SED) fitting and broadband colors indicate that [O II] emitters span the full range of galaxy populations at z {approx} 1.5. We also find that 80% of [O II] emitters are also photometrically classified as 'BX/BM' (UV) galaxies and/or the star-forming 'BzK' (near-IR) galaxies. Our [O II] emission line survey produces a far more complete and somewhat deeper sample of z {approx} 1.5 galaxies than either the BX/BM or sBzK selection alone. We constructed average SEDs and find that higher [O II] EW galaxies have somewhat bluer continua. SED model-fitting shows that they have on average half the stellar mass of galaxies with lower [O II] EW. The observed [O II] luminosity is well correlated with the far-UV continuum with a logarithmic slope of 0.89 {+-} 0.22. The scatter of the [O II] luminosity against the far-UV continuum suggests that [O II] can be used as a star formation rate indicator with a reliability of 0.23 dex.

Ly, Chun [Space Telescope Science Institute, Baltimore, MD 21218 (United States); Malkan, Matthew A.; Ross, Nathaniel R. [Department of Physics and Astronomy, UCLA, Los Angeles, CA 90095 (United States); Kashikawa, Nobunari; Hayashi, Masao [Optical and Infrared Astronomy Division, National Astronomical Observatory, Mitaka, Tokyo (Japan); Nagao, Tohru [The Hakubi Project, Kyoto University, Kyoto (Japan); Shimasaku, Kazuhiro [Department of Astronomy, School of Science, University of Tokyo, Bunkyo, Tokyo (Japan); Ota, Kazuaki, E-mail: chunly@stsci.edu [Department of Astronomy, Kyoto University, Kyoto (Japan)

2012-09-20T23:59:59.000Z

175

Dust and Chemical Abundances of the Sagittarius Dwarf Galaxy Planetary Nebula Hen2-436  

Science Journals Connector (OSTI)

We have estimated elemental abundances of the planetary nebula (PN) Hen2-436 in the Sagittarius (Sgr) spheroidal dwarf galaxy using ESO/VLT FORS2, Magellan/MMIRS, and Spitzer/IRS spectra. We have detected candidates of fluorine [F II]?4790, krypton [Kr III]?6826, and phosphorus [P II]?7875 lines and successfully estimated the abundances of these elements ([F/H] = +1.23, [Kr/H] = +0.26, [P/H] = +0.26) for the first time. These elements are known to be synthesized by the neutron capture process in the He-rich intershell during the thermally pulsing asymptotic giant branch (AGB) phase. We present a relation between C, F, P, and Kr abundances among PNe and C-rich stars. The detections of these elements in Hen2-436 support the idea that F, P, Kr together with C are synthesized in the same layer and brought to the surface by the third dredge-up. We have detected N II and O II optical recombination lines (ORLs) and derived the N2+ and O2+ abundances. The discrepancy between the abundance derived from the oxygen ORL and that derived from the collisionally excited line is >1 dex. To investigate the status of the central star of the PN, nebula condition, and dust properties, we construct a theoretical spectral energy distribution (SED) model to match the observed SED with CLOUDY. By comparing the derived luminosity and temperature of the central star with theoretical evolutionary tracks, we conclude that the initial mass of the progenitor is likely to be ~1.5-2.0 M ? and the age is ~3000 yr after the AGB phase. The observed elemental abundances of Hen2-436 can be explained by a theoretical nucleosynthesis model with a star of initial mass 2.25 M ?, Z = 0.008, and LMC compositions. We have estimated the dust mass to be 2.9?104 M ? (amorphous carbon only) or 4.0?104 M ? (amorphous carbon and polycyclic aromatic hydrocarbon). Based on the assumption that most of the observed dust is formed during the last two thermal pulses and the dust-to-gas mass ratio is 5.58 ? 103, the dust mass-loss rate and the total mass-loss rate are 8 M ? yr1and 6 M ? yr1, respectively. Our estimated dust mass-loss rate is comparable to a Sgr dwarf galaxy AGB star with similar metallicity and luminosity.

Masaaki Otsuka; Margaret Meixner; David Riebel; Siek Hyung; Akito Tajitsu; Hideyuki Izumiura

2011-01-01T23:59:59.000Z

176

A TWO MICRON ALL SKY SURVEY VIEW OF THE SAGITTARIUS DWARF GALAXY. VI. s-PROCESS AND TITANIUM ABUNDANCE VARIATIONS ALONG THE SAGITTARIUS STREAM  

SciTech Connect (OSTI)

We present high-resolution spectroscopic measurements of the abundances of the alpha element titanium (Ti) and s-process elements yttrium (Y) and lanthanum (La) for 59 candidate M giant members of the Sagittarius (Sgr) dwarf spheroidal (dSph) + tidal tail system pre-selected on the basis of position and radial velocity (RV). As expected, the majority of these stars show peculiar abundance patterns compared to those of nominal Milky Way (MW) stars, but as a group, the stars form a coherent picture of chemical enrichment of the Sgr dSph from [Fe/H] = -1.4 to solar abundance. This sample of spectra provides the largest number of Ti, La, and Y abundances yet measured for a dSph, and spans metallicities not typically probed by studies of the other, generally more metal-poor MW satellites. On the other hand, the overall [Ti/Fe], [Y/Fe], [La/Fe], and [La/Y] patterns with [Fe/H] of the Sgr stream plus Sgr core do, for the most part, resemble those seen in the Large Magellanic Cloud (LMC) and other dSphs, only shifted by DELTA[Fe/H] approx +0.4 from the LMC and by approx+1 dex from the other dSphs; these relative shifts reflect the faster and/or more efficient chemical evolution of Sgr compared to the other satellites, and show that Sgr has had an enrichment history more like the LMC than the other dSphs. By tracking the evolution of the abundance patterns along the Sgr stream we can follow the time variation of the chemical make-up of dSph stars donated to the Galactic halo by Sgr. This evolution demonstrates that while the bulk of the stars currently in the Sgr dSph is quite unlike those of the Galactic halo, an increasing number of stars farther along the Sgr stream have abundances like MW halo stars, a trend that shows clearly how the Galactic halo could have been contributed by present-day satellite galaxies even if the present chemistry of those satellites is now different from typical halo field stars. Finally, we analyze the chemical abundances of a moving group of M giants among the Sgr leading arm stars at the North Galactic Cap, but having RVs unlike the infalling Sgr leading arm debris there. Through use of 'chemical fingerprinting', we conclude that these mostly receding northern hemisphere M giants also are Sgr stars, likely trailing arm debris overlapping the Sgr leading arm in the north.

Chou, Mei-Yin; Majewski, Steven R.; Patterson, Richard J. [Department of Astronomy, University of Virginia, Charlottesville, VA 22904-4325 (United States); Cunha, Katia; Smith, Verne V. [National Optical Astronomy Observatories, P.O. Box 26732, Tucson, AZ 85726 (United States); Martinez-Delgado, David [Instituto de Astrofisica de Canarias, La Laguna (Spain); Geisler, Doug, E-mail: mc6ss@virginia.ed, E-mail: srm4n@virginia.ed, E-mail: rjp0i@virginia.ed, E-mail: cunha@noao.ed, E-mail: vsmith@noao.ed, E-mail: ddelgado@iac.e, E-mail: dgeisler@astro-udec.c [Departamento de Astronomia, Universidad de Concepcion, Casilla 160-C, Concepcion (Chile)

2010-01-10T23:59:59.000Z

177

EXPLORING THE LOW-MASS END OF THE M{sub BH}-{sigma}{sub *} RELATION WITH ACTIVE GALAXIES  

SciTech Connect (OSTI)

We present new measurements of stellar velocity dispersions, using spectra obtained with the Keck Echellette Spectrograph and Imager (ESI) and the Magellan Echellette (MagE), for 76 Seyfert 1 galaxies from the recent catalog of Greene and Ho. These objects were selected from the Sloan Digital Sky Survey (SDSS) to have estimated black hole (BH) masses below 2 x 10{sup 6} M{sub sun}. Combining our results with previous ESI observations of similar objects, we obtain an expanded sample of 93 galaxies and examine the relation between BH mass and velocity dispersion (the M{sub BH}-{sigma}{sub *} relation) for active galaxies with low BH masses. The low-mass active galaxies tend to follow the extrapolation of the M{sub BH}-{sigma}{sub *} relation of inactive galaxies. Including results for active galaxies of higher BH mass from the literature, we find a zero point {alpha} = 7.68 {+-} 0.08 and slope of {beta} = 3.32 {+-} 0.22 for the M{sub BH}-{sigma}{sub *} relation (in the form log M{sub BH} = {alpha} + {beta}log ({sigma}{sub *}/200 km s{sup -1})), with intrinsic scatter of 0.46 {+-} 0.03 dex. This result is consistent, within the uncertainties, with the slope of the M{sub BH}-{sigma}{sub *} relation for reverberation-mapped active galaxies with BH masses from 10{sup 6} to 10{sup 9} M{sub sun}. For the subset of our sample having morphological information from Hubble Space Telescope images, we examine the slope of the M{sub BH}-{sigma}{sub *} relation separately for subsamples of barred and unbarred host galaxies, and find no significant evidence for a difference in slope. We do find a mild offset between low-inclination and high-inclination disk galaxies, such that more highly inclined galaxies tend to have larger {sigma}{sub *} at a given value of BH mass, presumably due to the contribution of disk rotation within the spectroscopic aperture. We also find that the velocity dispersion of the ionized gas, measured from narrow emission lines including [N II] {lambda}6583, [S II] {lambda}{lambda}6716, 6731, and the core of [O III] {lambda}5007 (with the blueshifted wing removed), trace the stellar velocity dispersion well for this large sample of low-mass Seyfert 1 galaxies.

Xiao Ting [Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China, Chinese Academy of Sciences, Hefei, Anhui 230026 (China); Barth, Aaron J. [Department of Physics and Astronomy, University of California at Irvine, 4129 Frederick Reines Hall, Irvine, CA 92697-4575 (United States); Greene, Jenny E.; Ludwig, Randi R. [University of Texas at Austin, Department of Astronomy, 1 University Station, C1400, Austin, TX 78712-0259 (United States); Ho, Luis C. [The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101 (United States); Bentz, Misty C. [Department of Physics and Astronomy, Georgia State University, Astronomy Offices, One Park Place South SE, Suite 700, Atlanta, GA 30303 (United States); Jiang Yanfei, E-mail: xiaoting@mail.ustc.edu.cn, E-mail: barth@uci.edu, E-mail: jgreene@astro.as.utexas.edu, E-mail: lho@obs.carnegiescience.edu, E-mail: bentz@chara.gsu.edu, E-mail: yanfei@astro.princeton.edu [Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)

2011-09-20T23:59:59.000Z

178

A study of the market structure of the United States' rice industry  

E-Print Network [OSTI]

, ;industry ag organisation and . pcx'for~ . , ", :, ::*;; ?"'. . . ' ', ', 'I 7 elauce'' - Rsrshal. lian ' 9'Ad neo' marsha1. liisn theorist'8 iI"'::-;:-': -'. 'dex. 'vied theories sb'auk' the. pex formanoe of an industry. . hhar'-';, ":-'-;-, ' ;- @uter..."end pioneering eontribbtion by an adaptation of the . theory oZ imperCeet. ceapetition develops'd by a~xlin-, ? Robinsbn, "-Triggin"and others '', to the:agrieultiiial-'proc'esjsing add-'=d+trxbnting. , indnstx', iesi '. jxn resent -ye'ars:, :-;:;xeaaarjh...

Farruk, Muhammad Osman

2012-06-07T23:59:59.000Z

179

In Brief  

Science Journals Connector (OSTI)

... Geothermal energy ... energyGeothermal energy in the United Kingdom is not likely ever to be a major resource. ...

1976-03-11T23:59:59.000Z

180

In vivo dosimetry in brachytherapy  

SciTech Connect (OSTI)

In vivo dosimetry (IVD) has been used in brachytherapy (BT) for decades with a number of different detectors and measurement technologies. However, IVD in BT has been subject to certain difficulties and complexities, in particular due to challenges of the high-gradient BT dose distribution and the large range of dose and dose rate. Due to these challenges, the sensitivity and specificity toward error detection has been limited, and IVD has mainly been restricted to detection of gross errors. Given these factors, routine use of IVD is currently limited in many departments. Although the impact of potential errors may be detrimental since treatments are typically administered in large fractions and with high-gradient-dose-distributions, BT is usually delivered without independent verification of the treatment delivery. This Vision 20/20 paper encourages improvements within BT safety by developments of IVD into an effective method of independent treatment verification.

Tanderup, Kari [Department of Oncology, Aarhus University Hospital, Aarhus 8000 (Denmark); Department of Clinical Medicine, Aarhus University, Aarhus 8000 (Denmark); Beddar, Sam [Department of Radiation Oncology, University of Texas MD Anderson Cancer Center, Houston, Texas 77030 (United States); Andersen, Claus E.; Kertzscher, Gustavo [Center of Nuclear Technologies, Technical University of Denmark, Roskilde 4000 (Denmark); Cygler, Joanna E. [Department of Physics, Ottawa Hospital Cancer Centre, Ottawa, Ontario K1H 8L6 (Canada)

2013-07-15T23:59:59.000Z

Note: This page contains sample records for the topic "antiknock in dex" 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

In situ bioremediation in Europe  

SciTech Connect (OSTI)

Site remediation activity in Europe is increasing, even if not at the forced pace of the US. Although there is a better understanding of the benefits of bioremediation than of other approaches, especially about in situ bioremediation of contaminated soils, relatively few projects have been carried out full-scale in Europe or in the US. Some engineering companies and large industrial companies in Europe are investigating bioremediation and biotreatment technologies, in some cases to solve their internal waste problems. Technologies related to the application of microorganisms to the soil, release of nutrients into the soil, and enhancement of microbial decontamination are being tested through various additives such as surfactants, ion exchange resins, limestone, or dolomite. New equipment has been developed for crushing and mixing or injecting and sparging the microorganisms, as have new reactor technologies (e.g., rotating aerator reactors, biometal sludge reactors, and special mobile containers for simultaneous storage, transportation, and biodegradation of contaminated soil). Some work has also been done with immobilized enzymes to support and restore enzymatic activities related to partial or total xenobiotic decontamination. Finally, some major programs funded by public and private institutions confirm that increasing numbers of firms have a working interest in bioremediation.

Porta, A. [Battelle Europe, Geneva (CH); Young, J.K.; Molton, P.M. [Pacific Northwest Lab., Richland, WA (US)

1993-06-01T23:59:59.000Z

182

In reply  

Science Journals Connector (OSTI)

......human ancestors, there could have been no special creation of humankind, thus there could have been no adamic fall and there was therefore...poten- tial meteorite falls seen near these islands regrettably end up in the sea. Alastair McBeath, IMO Vice-President and......

John Bridges; J P Schwanethal; M Paton; V K Pearson; R C Greenwodm; J S Watson; G H Morgan

2005-02-01T23:59:59.000Z

183

In Theory  

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

5, 1998 5, 1998 Number 11 For every fundamental particle, the theory of supersymmetry proposes a supersymmetric partner, a "sparticle" in SUSY jargon. The electron, e, for example, has a SUSY spartner, the selectron ~ e. Would every Fermilab theorist have a SUSY "stheorist"? Probably not, but theorists worldwide will be watching Tevatron Run II for the first experimental evidence for SUSY. In Theory f INSIDE 2 Supersymmetry 7 Supersymmetry Workshop 8 MiniBooNE 10 Fishing 12 Paperless Papers 14 CDF Party The Fermilab Stheory Group ~ The Fermilab Theory Group by Meher Antia Without resorting to tricky mathematics or exotic physics, anyone can see that much of the stuff the world is made of has mass. Things can be touched and felt; they have some bulk, unlike, say, light which is intangible and

184

THE MASS DEPENDENCE BETWEEN PROTOPLANETARY DISKS AND THEIR STELLAR HOSTS  

SciTech Connect (OSTI)

We present a substantial extension of the millimeter (mm) wave continuum photometry catalog for circumstellar dust disks in the Taurus star-forming region, based on a new ''snapshot'' {lambda} = 1.3 mm survey with the Submillimeter Array. Combining these new data with measurements in the literature, we construct a mm-wave luminosity distribution, f(L{sub mm}), for Class II disks that is statistically complete for stellar hosts with spectral types earlier than M8.5 and has a 3{sigma} depth of roughly 3 mJy. The resulting census eliminates a longstanding selection bias against disks with late-type hosts, and thereby demonstrates that there is a strong correlation between L{sub mm} and the host spectral type. By translating the locations of individual stars in the Hertzsprung-Russell diagram into masses and ages, and adopting a simple conversion between L{sub mm} and the disk mass, M{sub d} , we confirm that this correlation corresponds to a statistically robust relationship between the masses of dust disks and the stars that host them. A Bayesian regression technique is used to characterize these relationships in the presence of measurement errors, data censoring, and significant intrinsic scatter: the best-fit results indicate a typical 1.3 mm flux density of {approx}25 mJy for 1 M{sub Sun} hosts and a power-law scaling L{sub mm}{proportional_to}M{sub *}{sup 1.5-2.0}. We suggest that a reasonable treatment of dust temperature in the conversion from L{sub mm} to M{sub d} favors an inherently linear M{sub d} {proportional_to}M{sub *} scaling, with a typical disk-to-star mass ratio of {approx}0.2%-0.6%. The measured rms dispersion around this regression curve is {+-}0.7 dex, suggesting that the combined effects of diverse evolutionary states, dust opacities, and temperatures in these disks imprint a full width at half-maximum range of a factor of {approx}40 on the inferred M{sub d} (or L{sub mm}) at any given host mass. We argue that this relationship between M{sub d} and M{sub *} likely represents the origin of the inferred correlation between giant planet frequency and host star mass in the exoplanet population, and provides some basic support for the core accretion model for planet formation. Moreover, we caution that the effects of incompleteness and selection bias must be considered in comparative studies of disk evolution, and illustrate that fact with statistical comparisons of f(L{sub mm}) between the Taurus catalog presented here and incomplete subsamples in the Ophiuchus, IC 348, and Upper Sco young clusters.

Andrews, Sean M.; Rosenfeld, Katherine A.; Kraus, Adam L.; Wilner, David J., E-mail: sandrews@cfa.harvard.edu [Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)

2013-07-10T23:59:59.000Z

185

In Memoriam Archive  

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

Art managed skillfully to include his interests in astrophysics. Art organized airborne solar eclipse expeditions to Samoa in 1965, Argentina in 1966, Mexico in 1970, Canada in...

186

Study in Germany / Work in Germany  

E-Print Network [OSTI]

Study in Germany / Work in Germany Opportunities Prof. Dr. Silke R. Falkner German Programme Coordinator silke.falkner@usask.ca Tel.: 966-5744 #12;Content I. Opportunities for Study in Germany II. German in Germany V. Term II courses #12;I.A. Study in Germany (Summer) 1. CSSG: Canadian Summer School in Germany

Peak, Derek

187

Computer Exercises in Maple  

E-Print Network [OSTI]

Maple Translations. Maple Exercises in PostScript format; Maple Exercises in .dvi format; Maple Exercises in .pdf format.

188

CHILD LABOR IN IRAQ.  

E-Print Network [OSTI]

??One in six children in the developing world is engaged in Child labor. Child labor is considered an issue that violates children's rights in many (more)

Al-Taee, Hawraa F.

2011-01-01T23:59:59.000Z

189

Lead in Maple Syrup Produced in Connecticut  

Science Journals Connector (OSTI)

Lead in Maple Syrup Produced in Connecticut ... Department of Analytical Chemistry, The Connecticut Agricultural Experiment Station, P.O. ... Box 1106, New Haven, Connecticut 06504 ...

David E. Stilwell; Craig L. Musante

1996-10-17T23:59:59.000Z

190

Environmental Radioactivity in Denmark in 1983  

E-Print Network [OSTI]

, potatoes, vegetables, (continued) INIS-Descriptors: AIR; AMERICIUM ISOTOPES; AQUATIC ECOSYSTEMS; AT was determined in precipitation, ground water and sea water. Plutonium and Americium were measured in marine

191

Company/Product Description Contract Number Contract Holders  

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

Company/Product Company/Product Description Contract Number Contract Holders (contact directly) Small Business Product POCs DOE POC Adobe Adobe's Government Cumulative Licenses Program (CLP) and Enterprise Agreement (EA2) Program. Most Adobe desktop products and services DE-IM0000595 Emergent, LLC: Tenley White ph: 571-419-6430 twhite@emergent360.com Matthew Frazee ph: 571-419-6419 MFrazee@emergent360.com YES Adobe: Tiffany Person ph: 847-224-2746 tiperson@adobe.com Alan Andon Alan.Andon@hq.doe.gov 301-903-9722 AT&T email Cybersecurity Services (DEX) DE-IM0000695 AT&T: Linda D. Blanchard ph: 443-896-5291 lb4826@att.com NO AT&T PM: Linda D. Blanchard ph: 443-896-5291 lb4826@att.com DOE PM: Brian Varine ph: : 202-586-8139 Brian.varine@hq.doe.gov Core Security

192

North Brawley Power Plant Asset Impairment Analysis | Open Energy  

Open Energy Info (EERE)

North Brawley Power Plant Asset Impairment Analysis North Brawley Power Plant Asset Impairment Analysis Jump to: navigation, search OpenEI Reference LibraryAdd to library Web Site: North Brawley Power Plant Asset Impairment Analysis Author Giza Singer Even Published Publisher Not Provided, Date Not Provided DOI Not Provided Check for DOI availability: http://crossref.org Online Internet link for North Brawley Power Plant Asset Impairment Analysis Citation Giza Singer Even. North Brawley Power Plant Asset Impairment Analysis [Internet]. [updated 2012;cited 2012]. Available from: http://www.sec.gov/Archives/edgar/data/1296445/000119312512118396/d316623dex991.htm Retrieved from "http://en.openei.org/w/index.php?title=North_Brawley_Power_Plant_Asset_Impairment_Analysis&oldid=682476" Categories: References

193

Quantitative evaluation of ammonium hydrosulfide reagent for precipitation of group II cations at 1.0 molar hydrogen ion concentration and for separation of group II and group III cations  

E-Print Network [OSTI]

, . 9 melen by~@en ion oenoen4xatien when eeyanaClen ef 1i yLtatmg a Grid XX ea4Xen, ne 4' evlfMe, e4 X. O ? CXt &44k O@KLCGXAX'8. '49. GB 8%6. l)p' pX'4IQigi484~ S 6M'gp XXX - ed%. ee @+~&9. 8e xi@@ ed, MXg ~eniermX ee1u41ea. Ree~qMee ' eX' 8k@ ~i...~es--'ljx'emefex'xe@ Co e $09 @1? Be'DexGGotp f ' -T sekima'&XameChate AzemJo, . (XXX) . Dlengaxwtee (XI) . Gep@rnexomt . , %'ice. exeemlomp yxldte, ewxyle i eea:4keaqgve@ e45h. ; . %+8 . 8@Xggi@@' Wee '48gef Q$Xg 5894?elkee8 bp' @g'gp@@S! ~N$'45' 1 @f"8" eLL~ -?OS...

Ramsey, Jerry Warren

2012-06-07T23:59:59.000Z

194

Political Risk in Finland.  

E-Print Network [OSTI]

?? Thesis political risk in Finland will explain the real nature of the financial crisis in Finland in the beginning of 1990s. Before 1990s Finland (more)

Davidsson, Jukka

2007-01-01T23:59:59.000Z

195

Vortices in Brain waves  

E-Print Network [OSTI]

2003). Vortices in Brain Waves 62. M. E. Raichle, ScienceVORTICES IN BRAIN WAVES WALTER J. FREEMAN Department ofthat is recorded in brain waves (electroencephalogram, EEG).

Freeman, Walter J III; Vitiello, Giuseppe

2010-01-01T23:59:59.000Z

196

Developments in geothermal resources in 1982  

SciTech Connect (OSTI)

The total number of geothermal wells drilled in 1982 decreased to 79 from 99 wells in 1981. Total footage drilled in 1982 decreased to 559,326 ft from 676,127 ft in 1981. An increase in average well depth from 6,830 ft in 1981 to 7,080 ft in 1982 indicated that operators are having to drill deeper in their efforts to extend the productive limits of proven geothermal reservoirs. Of the 79 geothermal wells completed in 1982, about 80% were drilled in California. Two major acquisitions occurred during 1982 in The Geysers geothermal field in northern California. Geothermal Resources International, Inc. then entered into agreements for the exploration and development of the acreage with the Central California Power Agency. Other achievements included the accelerated federal geothermal leasing program reaching its goal of offering about 600,000 acres in 14 sales held by the U.S. Bureau of Land Management. Finally, the dedication of several district heating projects highlighted the direct-use application of geothermal resources in 1982.

Combs, J.; Anderson, D.N.; Berge, C.W.; Lund, J.W.; Parmentier, P.P.

1983-10-01T23:59:59.000Z

197

Lyme Disease in Children in Southeastern Connecticut  

Science Journals Connector (OSTI)

...disease in southeastern Connecticut. Methods. Study Population. All children from five pediatric practices who were given a diagnosis of Lyme disease of recent onset were eligible to be enrolled in the study. The five pediatric practices are located in southeastern Connecticut, the area of the state with... Lyme disease has become a relatively common problem among children in areas of the country in which the disease is endemic.1,2 However, there are few prospective studies of the disease among children in the United States. Many parents fear that their ...

Gerber M.A.Shapiro E.D.Burke G.S.Parcells V.J.Bell G.L.

1996-10-24T23:59:59.000Z

198

Essays in labor economics  

E-Print Network [OSTI]

I addressed three questions in Labor Economics, using experimental and quasi-experimental variation to determine causality. In the first chapter, I ask whether playing longer in the NFL increases mortality in retirement. ...

Williams, Tyler (Tyler Kenneth)

2013-01-01T23:59:59.000Z

199

Isotope studies in photosynthesis  

Science Journals Connector (OSTI)

Isotope studies in photosynthesis ... Examines the use of isotopic oxygen, hydrogen, carbon, and phosphorus in the study of photosynthesis. ...

J. A. Bassham; A. A. Benson; Melvin Calvin

1953-01-01T23:59:59.000Z

200

Developments in oil shale in 1987  

SciTech Connect (OSTI)

Oil shale development continued at a slow pace in 1987. The continuing interest in this commodity is demonstrated by the 342 oil shale citations added to the US Department of Energy Energy Database during 1987. The Unocal project in Parachute, Colorado, produced 600,000 bbl of synfuel in 1987. An appreciable amount of 1987's activity was associated with the nonsynfuel uses of oil shale. 4 figs., 2 tabs.

Knutson, C.F.; Dana, G.F.; Solti, G.; Qian, J.L.; Ball, F.D.; Hutton, A.C.; Hanna, J.; Russell, P.L.; Piper, E.M.

1988-10-01T23:59:59.000Z

Note: This page contains sample records for the topic "antiknock in dex" 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

Anomalies in conservation laws in quantum mechanics  

Science Journals Connector (OSTI)

It has been pointed out that a simple quantum-mechanical system, involving a charged particle moving in a uniform magnetic field, can exhibit what looks like an anomaly. This note analyzes the problem, and shows that in such cases the anomaly is (in some sense) already present at the classical level.

R. S. Ward

1987-07-15T23:59:59.000Z

202

Magnetic rotation in {sup 112}In  

SciTech Connect (OSTI)

The high spin states of {sup 112}In have been investigated with in-beam {gamma}-ray spectroscopic methods using the {sup 110}Pd({sup 7}Li,5n){sup 112}In reaction at a beam energy of 50 MeV. A level scheme with three band structures has been established and their configurations are discussed. The positive-parity dipole band has been assigned as a magnetic rotation band. Particle-rotor model calculations have also been performed to interpret the rotational structures in {sup 112}In.

He, C. Y.; Li, X. Q.; Wu, X. G.; Liu, Y.; Pan, B.; Li, G. S.; Li, L. H.; Wang, Z. M. [China Institute of Atomic Energy, Beijing 102413 (China); Zhu, L. H. [School of Physics and Nuclear Energy Engineering, Beihang University, Beijing 100191 (China); School of Science, Shenzhen University, Shenzhen 518060 (China); Qi, B.; Wang, S. Y. [School of Space Science and Physics, Shandong University at Weihai, Weihai 264209 (China); Li, Z. Y. [School of Physics and SK Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 (China); Xu, Q.; Wang, J. G.; Ding, H. B. [Department of Physics, Tsinghua University, Beijing 100084 (China); Zhai, J. [Department of Physics, Jilin University, Changchun 130023 (China)

2011-02-15T23:59:59.000Z

203

Acoustics education in Ukraine  

Science Journals Connector (OSTI)

Acoustics education in Ukraine is considered. In more than 40 universities students learn acoustics: in the acoustics department of the National Technical University in Ukraine (only one department in Ukraine) and many related departments such as Nondestructive Testing Physics Electrical Engineering etc. Acoustical specializations of departments are presented. The most promising and developing acoustical specialization is biomedical acoustics.

Stanislav M. Mayevskyy; Leonid M. Gelman

1999-01-01T23:59:59.000Z

204

CP violation in SUSY  

E-Print Network [OSTI]

CP violation in supersymmetric models is reviewd with focus on explicit CP violation in the MSSM. The topics covered in particular are CP-mixing in the Higgs sector and its measurement at the LHC, CP-odd observables in the gaugino sector at the ILC, EDM constraints, and the neutralino relic density.

S. Kraml

2007-10-26T23:59:59.000Z

205

Oscillations in glow discharges  

E-Print Network [OSTI]

OSCILLATIONS IN GLOW DISCHARGES A Dissertation By Tom Prickett, Jr. June 1950 Approved as to style and content by Chairman of Committee OSCILLATIONS IN GLOW DISCHARGES A Dissertation By Tom Prickett, Jr* June 1950 OSCILLATIONS IN GLOW... 1950 CONTENTS Introduction ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 1 I. Review of Plasma Oscillations in Gas Discharges ? . . 2 II. Review of Relaxation Processes in Gas Discharges ? . 13 III. Report of Laboratory Investigation...

Prickett, Tom

1950-01-01T23:59:59.000Z

206

Private Schools in America  

Science Journals Connector (OSTI)

... There are in America half a million pupils in private schools-schools maintained solely by fees and endowments. Even allowing for a population in ... of Britain, one may say that this figure of half a million represents proportionately a private-school enrolment in America at least twice as large as the public-school enrolment in ...

WILLARD CONNELY

1942-10-10T23:59:59.000Z

207

In partners EXTENSION CE  

E-Print Network [OSTI]

service Minnesota Local egetables i directors i a n in #12;LOCAL FOOD MARKET IN HEALTHCARE FRUITS AND VEGETABLES IN HEALTHCARE INSTITUTIONS BASED ON A SURVEY OF FOOD SERVICE DIRECTORS IN BECKER of Minnesota Extension conducted a survey of food service directors in Becker, Clay, Otter Tail, and Wilkin

Ciocan-Fontanine, Ionut

208

Magnetism in Nanocrystalline Gold  

Science Journals Connector (OSTI)

Magnetism in Nanocrystalline Gold ... Bridging the current gap in experimental study of magnetism in bare gold nanomaterials, we report here on magnetism in gold nanocrystalline films produced by cluster deposition in the aggregate form that can be considered as a crossover state between a nanocluster and a continuous film. ... gold; nanocrystalline film; magnetism; cluster deposition; SQUID magnetometry ...

Vladimir Tuboltsev; Alexander Savin; Alexandre Pirojenko; Jyrki Risnen

2013-07-07T23:59:59.000Z

209

Vibration in Engineering  

Science Journals Connector (OSTI)

... THE theory of vibrations has in recent years A become of dominating importance in engineering. It is well ... A become of dominating importance in engineering. It is well known, for example, that vibrations in heavy machinery may be of a destructive nature, causing failures in the machines ...

1935-08-10T23:59:59.000Z

210

Eliminating MTBE in Gasoline in 2006  

Gasoline and Diesel Fuel Update (EIA)

02/22/2006 02/22/2006 Eliminating MTBE in Gasoline in 2006 Summary In 2005, a number of petroleum companies announced their intent to remove methyl tertiary-butyl ether (MTBE) from their gasoline in 2006. Companies' decisions to eliminate MTBE have been driven by State bans due to water contamination concerns, continuing liability exposure from adding MTBE to gasoline, and perceived potential for increased liability exposure due to the elimination of the oxygen content requirement for reformulated gasoline (RFG) included in the Energy Policy Act of 2005. EIA's informal discussions with a number of suppliers indicate that most of the industry is trying to move away from MTBE before the 2006 summer driving season. Currently, the largest use of MTBE is in RFG consumed on the East Coast outside of

211

In situ combustion field experiences in Venezuela  

SciTech Connect (OSTI)

A literature review of four in situ combustion projects: in Miga, Tia Juana, Melones and Morichal fields in Venezuela was made, and a summary of these projects is presented. Reservoir description and project performance data were analyzed. The behavior of the four in situ combustion field tests can be summarized as follows: The problems most often encountered were corrosion and high temperature producing wells. The direction in which the burning front moved was guided essentially by reservoir characteristics. The produced oil was upgraded by about 4{degrees} API, and viscosity was substantially reduced. For Mirochal and Miga fields, the analyses of available information from the combustion projects indicated that the process has been successful in the affected region. Conclusions from this review indicate that the two most frequent problems encountered were operational problems in producing wells and the direction of the burning front. The heterogeneous nature of the sands probably resulted in the burning front moving in a preferential direction, hence reducing areal sweep efficiency.

Villalba, M.; Estrada, M.; Bolivar, J. [INTEVEP, Caracas (Venezuela)

1995-02-01T23:59:59.000Z

212

Change in Contaminant Concentration in Fraser  

E-Print Network [OSTI]

during this period: dioxins, furans, polycyclic aromatic hydrocarbons (PAHs), chlorophenolics, resin to the peak in suspended sediment concentration during the freshet sampling period, iv) dioxins

213

State Experience in Hydrogen Infrastructure in California  

Broader source: Energy.gov [DOE]

Presentation by Gerhard Achtelik, California Air Resources Board, at the Hydrogen Infrastructure Market Readiness Workshop, February 17, 2011, in Washington, DC.

214

Tubulin in vitro, in vivo and in silico  

E-Print Network [OSTI]

interactions inversely proportional to ? will be enhanced, and thus become dominant against thermal losses. In the case of microtubules, the pertinent interactions are of the electric dipole type, scaling with the distance r as 1/( ? r?). For ordinary water... interactions inversely proportional to ? will be enhanced, and thus become dominant against thermal losses. In the case of microtubules, the pertinent interactions are of the electric dipole type, scaling with the distance r as 1/( ? r?). For ordinary water...

Mershin, Andreas

2005-02-17T23:59:59.000Z

215

Foreign Deities in Egypt  

E-Print Network [OSTI]

fig. 211. ) Foreign Deities in Egypt, Zivie-Coche, UEE 2011god Hauron and his cult in Egypt. Gttinger Miszellen 107,2011, Foreign Deities in Egypt. UEE. Full Citation: Zivie-

Zivie-Coche, Christiane

2011-01-01T23:59:59.000Z

216

Introduction: mixing in microfluidics  

Science Journals Connector (OSTI)

...Wiggins Introduction: mixing in microfluidics Julio M. Ottino 1 Stephen...comprising the Theme Issue. Microfluidics|Mixing|Chaos|Diffusion...Introduction: mixing in microfluidics. | In this paper we briefly...

2004-01-01T23:59:59.000Z

217

STREET CARS IN GLASGOW  

Science Journals Connector (OSTI)

STREET CARS IN GLASGOW 10.1126/science.12.300.491-a STREET CARS IN GLASGOW. | Journal Article...ocelots, orang-outangs, panthers, raccoons, rhinoceroses...delivery of the property. STREET CARS IN GLASGOW. THE street car...

1900-09-28T23:59:59.000Z

218

Bacteria in shear flow  

E-Print Network [OSTI]

Bacteria are ubiquitous and play a critical role in many contexts. Their environment is nearly always dynamic due to the prevalence of fluid flow: creeping flow in soil, highly sheared flow in bodily conduits, and turbulent ...

Marcos, Ph.D. Massachusetts Institute of Technology

2011-01-01T23:59:59.000Z

219

Essays in Regulatory Economics  

E-Print Network [OSTI]

of regular and premium gasoline of gas station i at month t,the Mexican gasoline market, all gas stations are franchisesdecreases in gasoline demand in gas stations exposed in the

Guerrero, Santiago

2011-01-01T23:59:59.000Z

220

Essays in organizational economics  

E-Print Network [OSTI]

The first chapter examines the interaction of heterogeneous firms in a competitive market in which firms motivate their workers using relational incentive contracts. In the steady-state rational-expectations equilibrium, ...

Powell, Michael Leslie

2011-01-01T23:59:59.000Z

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221

Enterococci in the Environment  

Science Journals Connector (OSTI)

...Bacteria in beach sands: an emerging challenge in protecting coastal water quality...enterococci concentrations in high-energy estuarine and coastal waters: towards...Environmental Protection Agency. 2004. Implementation guidance for ambient water quality criteria...

Muruleedhara N. Byappanahalli; Meredith B. Nevers; Asja Korajkic; Zachery R. Staley; Valerie J. Harwood

2012-12-01T23:59:59.000Z

222

Representation in Municipal Government  

E-Print Network [OSTI]

Municipal governments play a vital role in American democracy, as well as in governments around the world. Despite this, little is known about the degree to which cities are responsive to the views of their citizens. In ...

Tausanovitch, Chris

2014-07-30T23:59:59.000Z

223

Interface Magnetism in Multiferroics  

E-Print Network [OSTI]

of an antiferromagent U - Up UHV - Ultra-high vacuum VRH -in ultra-high vacuum (UHV). (a) Schematics illustrating thements done in air and in UHV. Black particles are impurities

He, Qing

2011-01-01T23:59:59.000Z

224

ISOTOPES IN WATER  

Science Journals Connector (OSTI)

The study of isotopic prosies ha two different though related basic aims: an understanding of the way in which the water cycle in linked to alterations in climate, and how the carbon cycle has responded to the...

W. GEORGE DARLING; ADRIAN H. BATH

2006-01-01T23:59:59.000Z

225

GEOPHYSICAL METHODS In 2003, a group of scientists in Swit-  

E-Print Network [OSTI]

with Petrobras in Brazil, Pemex in Mexico, Norsk Hydro in Libya and KOC in the Arabian Peninsula, it is evident

Podladchikov, Yuri

226

Symmetries in physics  

E-Print Network [OSTI]

The concept of symmetries in physics is briefly reviewed. In the first part of these lecture notes, some of the basic mathematical tools needed for the understanding of symmetries in nature are presented, namely group theory, Lie groups and Lie algebras, and Noether's theorem. In the second part, some applications of symmetries in physics are discussed, ranging from isospin and flavor symmetry to more recent developments involving the interacting boson model and its extension to supersymmetries in nuclear physics.

Roelof Bijker

2005-09-02T23:59:59.000Z

227

Optics in Brazil  

Science Journals Connector (OSTI)

For Brazilian scientists, optics is considered a leading field in technology transfer. The discipline plays a large role in the country?s ongoing scientific ...

Bagnato, Vanderlei; Brito Cruz, Carlos H de

2006-01-01T23:59:59.000Z

228

In PDF format  

E-Print Network [OSTI]

mappings by letting a point a in the interior split into two and travel to two ..... holomorphic in a neighborhood of ?. The Ahlfors map g extends holomorphically.

1911-00-51T23:59:59.000Z

229

Interconnect Issues in NE  

Broader source: Energy.gov [DOE]

Presentation covers interconnect issues in the Northeast and is given at the Spring 2010 Federal Utility Partnership Working Group (FUPWG) meeting in Providence, Rhode Island.

230

Assessment in natural sciences.  

E-Print Network [OSTI]

??This research study focusses on assessment in the Natural Sciences learning area in grades 8 and 9. The aspect under focus is the extent to (more)

Singh, Suresh Kamar

2009-01-01T23:59:59.000Z

231

Physics in Engineering  

Science Journals Connector (OSTI)

The application of discoveries made in pure science to engineering problems is described and illustrated by incidents in the history of submarine telegraph cables radio communication and electronics.

W. V. Houston

1955-01-01T23:59:59.000Z

232

Demand Response In California  

Broader source: Energy.gov [DOE]

Presentation covers the demand response in California and is given at the FUPWG 2006 Fall meeting, held on November 1-2, 2006 in San Francisco, California.

233

Solar Heating in Uppsala.  

E-Print Network [OSTI]

?? The housing corporation Uppsalahem has installed asolar heating system in the neighbourhood Haubitsen,which was renovated in 2011. This report examineshow much energy the solar (more)

Blomqvist, Emelie; Hger, Klara

2012-01-01T23:59:59.000Z

234

Complexity in Big History  

E-Print Network [OSTI]

Spier, Fred. How Big History Works: Energy Flows and RiseSmil, Vaclav. Energy in World History. Boulder, CO: Westviewkg) Energy and complexity Spier: Complexity in Big History.

Spier, Fred

2011-01-01T23:59:59.000Z

235

Heat confinement in spheromaks  

Science Journals Connector (OSTI)

Calculations are presented showing the temperatures expected in a spheromak sustained by continuous injection of helicity, based ... previously shown to agree with temperatures achieved in spheromak experiments c...

T. K. Fowler; D. D. Hua

2002-09-01T23:59:59.000Z

236

Essays in Environmental Economics  

E-Print Network [OSTI]

Kings County . . . . . . . . . . . . . . . . . . . . . . . . . . .farm workers, while Kings County has the lowest in bothfor example in Kern and Kings Counties. To illustrate this

Foreman, Kathleen

2013-01-01T23:59:59.000Z

237

Essays in Economics  

E-Print Network [OSTI]

Housing prices in King County . . . . . . . . . Empiricaldata from 2007 to 2011 on King County, WA (metro Seattle), Iproprietary data on homes in King County, Washington (metro

Romem, Israel Hadas

2013-01-01T23:59:59.000Z

238

Links in learning logarithms  

E-Print Network [OSTI]

an indicator of the value used in an exponentiation process. ..... International journal oflVIathematics Education in Science and Technology, 24(2), 209225.

239

AIDS in Connecticut  

Science Journals Connector (OSTI)

In order to...understand the epidemiology of acquired immunodeficiency syndrome (AIDS) in Connecticut, it is important to review the demographic...

James L. Hadler MD; MPH; Julia Wang Miller PhD

1989-01-01T23:59:59.000Z

240

In other news  

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

In other news Community Connections: Your link to news and opportunities from Los Alamos National Laboratory Latest Issue: Dec. 2014 - Jan. 2015 All Issues submit In other news...

Note: This page contains sample records for the topic "antiknock in dex" from the National Library of EnergyBeta (NLEBeta).
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241

Advances in Diagnostic Instrumentation  

DOE R&D Accomplishments [OSTI]

Developments in medical imaging in the last ten years are described. Techniques include fine focus x-ray tubes, computerized tomography, emission tomography, and ultrasonography. (ACR)

Perez-Mendez, V.

1980-01-00T23:59:59.000Z

242

Focusing in Linear Accelerators  

DOE R&D Accomplishments [OSTI]

Review of the theory of focusing in linear accelerators with comments on the incompatibility of phase stability and first-order focusing in a simple accelerator.

McMillan, E. M.

1950-08-24T23:59:59.000Z

243

TRENDS in Chemical Marketing  

Science Journals Connector (OSTI)

TRENDS in Chemical Marketing ... BEFORE any chemical sales organization, can meet or establish new trends in marketing, it must be completely aware of the problem it faces. ...

W. M. RUSSELL

1955-08-29T23:59:59.000Z

244

Advances in photosynthesis  

Science Journals Connector (OSTI)

Advances in photosynthesis ... This article emphasizes the relation between photosynthetic chemistry and the molecular architecture of the photosynthetic center in plant cells. ...

Roderic B. Park

1962-01-01T23:59:59.000Z

245

QUANTUM CONVERSION IN PHOTOSYNTHESIS  

E-Print Network [OSTI]

QUANTUM CONVERSION IN PHOTOSYNTHESIS Melvin Calvin Januaryas it occurs in modern photosynthesis can only take place inof the problem or photosynthesis, or any specific aspect of

Calvin, Melvin

2008-01-01T23:59:59.000Z

246

UF in Osnabrck Understanding Engineering in Europe  

E-Print Network [OSTI]

to design experiments, analyze data, and formulate statistical relationships on the data. You will also get will: 1) be introduced to various industries in Germany with the engineering and energy use highlighted the chance to climb a 100 meter tall wind generator tower! About the Location Osnabrück is located in Lower

Jawitz, James W.

247

203Literature in Translation LITERATURE IN  

E-Print Network [OSTI]

(Classics 201) (3)-- Classical Mythology An introduction to the study of Greek and Roman mythology in Translation 218 (3)-- Pre-Modern Chinese Literature in Translation A survey of Chinese literature from historical and cultural contexts from pre-modern to modern times

Dresden, Gregory

248

"Clean solutions; in research and in education."  

E-Print Network [OSTI]

of flexibility Carbon-Fiber Composites A project in our lab has resulted in the development of a carbon-fiber information please view the video from the carbon fiber jet engine plant recently opened on the Isle of Wight; multifunctional heat-pipes; manufacturing of complex carbon composite objects and improvement of STEM education

Acton, Scott

249

Individual variation in cooperative behaviour in meerkats  

E-Print Network [OSTI]

on the behaviour partly because of this benefit (West et al., 2007). Darwin (1859) identified cooperation in the form of sterile workers in social insects as representing one special diffi culty posed to his theory of evolution by natural selection (p. 236...

English, Sinad

2010-04-13T23:59:59.000Z

250

Estimated Ultraviolet Radiation Doses in Wetlands in  

E-Print Network [OSTI]

Estimated Ultraviolet Radiation Doses in Wetlands in Six National Parks Stephen A. Diamond,1 ABSTRACT Ultraviolet-B radiation (UV-B, 280­320-nm wave- lengths) doses were estimated for 1024 wetlands of vegetative features, and quantification of DOC concentration and spectral absorbance. UV-B dose estimates

Knapp, Roland

251

Solar in Remote Applications in the United States | Department...  

Energy Savers [EERE]

in Remote Applications in the United States Solar in Remote Applications in the United States Renewable energy and distributed generation resources have a critical role to play in...

252

Science in the Magazines  

Science Journals Connector (OSTI)

... control of private forest property is vested in the State. In Russia, until lately, liberty to cut, burn, destroy, and devastate forests was unrestricted, but in 1888 a ... a law came in force which, to some extent, put an end to this liberty of vandalism. The Russian Government now sustains twenty-four schools of forestry. A federal ...

1894-04-05T23:59:59.000Z

253

study programs in mathematics  

E-Print Network [OSTI]

study programs in m mathematics #12;#12;3 CONTENTS 5 Introduction 7 Mathematics at the University of Ljubljana 9 Department of Mathematics information page Academic study program in Mathematics Academic study program in Financial Mathematics Single cycle master's study program in Mathematics education

?umer, Slobodan

254

Minor in Philosophy Requirements  

E-Print Network [OSTI]

2012-05-23 Minor in Philosophy Requirements: 1. 18 hours of work in philosophy with grades of C- or better. 2. A 2.0 grade point average for all work attempted in philosophy. 3. 9 hours of upper division work in philosophy, with grades of C- or better. 4. Completion of at least one course, with a grade

Stowell, Michael

255

Tech Women In  

Science Journals Connector (OSTI)

......in SET, higher education and research and...studying computer science. We are now taking...for more computing science in the school curriculum...this year to build posters for school's careers...development talks and a poster competition for...in the pay gap in science and technology between......

Rebecca George

2013-01-01T23:59:59.000Z

256

Graduate Certificate in Transportation  

E-Print Network [OSTI]

Graduate Certificate in Transportation Nohad A. Toulan School of Urban Studies and Planning of Engineering and Computer Science integrated transportation systems. The Graduate Certificate in Transportation their capabilities. Students in the program can choose among a wide range of relevant courses in transportation

Bertini, Robert L.

257

Reading context in design  

E-Print Network [OSTI]

This study explores how, in the process of design, the reading of an existing order in the organizing features of a setting potentiates form. For this purpose, a design exercise on a site in the city of Jaipur in India has ...

Agrawal, Vivek

1993-01-01T23:59:59.000Z

258

Fossil Algae in India  

Science Journals Connector (OSTI)

... TWENTY-FIVE years ago, I reported in Nature J. the discovery of abundant fossil algae in the Cretaceous rocks of South India, especially in one of the limestones belonging ... associated flints and cherts which are their silicified representatives yielded a rich harvest of fossil algae of various kinds; these were studied and described by me in collaboration with Dr. ...

L. RAMA RAO

1958-02-22T23:59:59.000Z

259

Explosive Nucleosynthesis in Stars  

Science Journals Connector (OSTI)

... in hydrostatic equilibrium, with considerable effect on the abundances of the ejected matter. The overheating may result either from the fact that the fuels first ignite in a degenerate electron ... pressure wave propagates outward from an exploding core. In either case, large amounts of thermal energy are liberated in a time short compared with the star's ability to compensate ...

W. DAVID ARNETT; DONALD D. CLAYTON

1970-08-22T23:59:59.000Z

260

Electrophoretic Variation in Enzymes  

Science Journals Connector (OSTI)

...occur in human hemoglobin: the alpha chain is the same in both adult and fetal hemoglobins, and an alpha mutant af-fects both molecules...the capital must be handed down intact to future genera-tions...encouraged the in-dustry to break new ground, and in 1904 the...

Charles R. Shaw

1965-08-27T23:59:59.000Z

Note: This page contains sample records for the topic "antiknock in dex" 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.
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261

Parliament in Britain  

Science Journals Connector (OSTI)

... on October 18 that useful progress was being made in the three year programme on desalination which the Atomic Energy Authority was carrying out in association with industry on a planned ... look to conventional supplies because they were much cheaper. The possibility of erecting a pilot desalination plant in conjunction with a coastal nuclear power station would be kept in mind. ...

1966-10-29T23:59:59.000Z

262

IN TODAY'S PAPER International  

E-Print Network [OSTI]

India's participation in the multi-billion-dollar International Thermonuclear Reactor project which aims

263

Photosynthesis in Dynamic Animations  

Science Journals Connector (OSTI)

Photosynthesis in Dynamic Animations ... To support chemistry instruction in high school we created a series of interactive animations that show photosynthetic processes in a eukaryotic cell. ... The example from the educational program Photosynthesis in Dynamic Animations, the description of photosynthetic cell. ...

Milada Tepl; Helena Klmov

2013-10-09T23:59:59.000Z

264

Emotions in organisational research in nursing homes  

Science Journals Connector (OSTI)

Emotions clearly play an important role in living and working in nursing homes. Therefore research in cooperation with nursing homes or other long term care settings has to find a way to deal with these phenomena. This paper presents emotions as an integrated part of doing organisational research. The paper draws on transdisciplinary collaborative research with nursing homes on gender, ethical decisions and needs management. Feelings and emotions are core dimensions for knowledge construction and theory building on these issues. Working within a qualitative paradigm and a relational approach, it will be argued that care ethics serves as important source of basic principles.

Elisabeth Reitinger

2011-01-01T23:59:59.000Z

265

Nuclear spirals in galaxies  

E-Print Network [OSTI]

Recent high-resolution observations indicate that nuclear spirals are often present in the innermost few hundred parsecs of disc galaxies. My models show that nuclear spirals form naturally as a gas response to non-axisymmetry in the gravitational potential. Some nuclear spirals take the form of spiral shocks, resulting in streaming motions in the gas, and in inflow comparable to the accretion rates needed to power local Active Galactic Nuclei. Recently streaming motions of amplitude expected from the models have been observed in nuclear spirals, confirming the role of nuclear spirals in feeding of the central massive black holes.

Witold Maciejewski

2006-11-08T23:59:59.000Z

266

Radon in Syrian houses  

Science Journals Connector (OSTI)

A nationwide investigation of radon levels in Syrian houses was carried out during the period 1991 - 1993. Passive radon diffusion dosemeters using polycarbonate detectors were distributed in houses all over Syria. Detectors were subjected to electrochemical etching to reveal latent tracks of alpha particles. The mean radon concentration in Syrian houses was found to be with some values several times higher. This investigation indicated that there were a few houses in Syria that require remedial action. Most houses that have high levels of radon were found in the southern area, especially in the Damascus governorate. The study also indicated that radon concentrations were higher in old houses built from mud with no tiling.

I Othman; M Hushari; G Raja; A Alsawaf

1996-01-01T23:59:59.000Z

267

Energy in history  

SciTech Connect (OSTI)

This book presents the papers given at a symposium on the development of energy technologies in Czechoslovakia during the Industrial Revolution. Topics considered at the symposium included steam drive in the epoch of the Industrial Revolution, the energy crisis in the milling industry of late feudalism, the energy base of the food industry during the industrial and scientific revolution, power engineering in agriculture, and new energy in the transportation sector during the automobile revolution.

Purs, J.

1984-01-01T23:59:59.000Z

268

JAPAN: Investment in Graphite  

Science Journals Connector (OSTI)

JAPAN: Investment in Graphite ... Union Carbide, attempting entry into Japan's graphite electrode industry, has just had one obstacle removed from its path by the Fair Trade Commission in Tokyo. ... In deciding that the company's proposed joint venture with Nippon Carbon Co. conforms with provision's of Japan's antimonopoly law, FTC has improved the prospects for a new tactic in the often difficult process of foreign direct investment in Japanese production firms. ...

1969-08-25T23:59:59.000Z

269

Air Pollution in China in January 2013  

Science Journals Connector (OSTI)

In January 2013 exceptionally high levels of particulate matter (PM) concentrations were reported for the area around Beijing (40 N, 116 E) with maximum concentrations exceeding 500 ?g/m3.... Observations of the ...

Volker Matthias; Armin Aulinger

2014-01-01T23:59:59.000Z

270

In-shock cooling in numerical simulations  

Science Journals Connector (OSTI)

......especially interested in the production of molecular hydrogen, and so we follow the...hydrodynamics|shock waves|methods: numerical| 1 Introduction...the rate of molecular hydrogen (H2) and hydrogen-deuterium (HD) production. These two molecules......

Roger M. Hutchings; Peter A. Thomas

2000-12-11T23:59:59.000Z

271

Abstracts of posters in Access in children  

Science Journals Connector (OSTI)

In paediatric hemodialysed patients it is often very difficult to realize a lasting vascular access with a balanced flow rate. To perform an effective surgical management without a serious injury to the vessel...

Gauke Kootstra MD; PhD; Paul J. G. Jrning MD; PhD

1983-01-01T23:59:59.000Z

272

University Roles in Technological Innovation in California  

E-Print Network [OSTI]

the foundation. Climate and Energy Projects The major worldStanford Global Climate and Energy Project. In 2002,for a Global Climate and Energy Project (G-CEP) 29 . The

King, C. Judson

2007-01-01T23:59:59.000Z

273

Turbulence in nature and in the laboratory  

Science Journals Connector (OSTI)

...National Academy of Sciences, Self-Organized...Biological, and Social Sciences, held March 23...National Academies of Science and Engineering...are outlined and recent advances in describing...Mechanical and Aerospace Engineering, Cornell...

Z. Warhaft

2002-01-01T23:59:59.000Z

274

Doppler effect in light scattering in liquids  

Science Journals Connector (OSTI)

The present work deals with the study of the state of polarisation of the three components observed in the spectrum of monochromatic light scattered by liquid formic and acetic acids, when examined with a Fabr...

B. V. Raghavendra Rao

1936-06-01T23:59:59.000Z

275

Nuclear Masses in Astrophysics  

E-Print Network [OSTI]

Among all nuclear ground-state properties, atomic masses are highly specific for each particular combination of N and Z and the data obtained apply to a variety of physics topics. One of the most crucial questions to be addressed in mass spectrometry of unstable radionuclides is the one of understanding the processes of element formation in the Universe. To this end, accurate atomic mass values of a large number of exotic nuclei participating in nucleosynthesis are among the key input data in large-scale reaction network calculations. In this paper, a review on the latest achievements in mass spectrometry for nuclear astrophysics is given.

Christine Weber; Klaus Blaum; Hendrik Schatz

2008-12-09T23:59:59.000Z

276

Paleotemperatures preserved in fluid inclusions in halite  

SciTech Connect (OSTI)

A variety of paleoclimate proxy records allow determination of relative warming or cooling. However, if we are to understand climate change, quantification of past temperature fluctuations is essential. Our research indicates that fluid inclusions in halite can yield homogenization temperatures that record surface brine temperatures at the time of halite precipitation. To avoid problems with stretching, leaking, and initial trapping of air, samples with primary, single-phase (liquid) fluid inclusions are chilled in a freezer to nucleate vapor bubbles. We tested the reliability of this method of obtaining fluid-inclusion homogenization temperatures using modern salts precipitated at Badwater Basin, Death Valley, California. Homogenization temperatures correlate well with measured brine temperatures. The same method is applied to fluid inclusions in Pleistocene halite from a core taken at the same location in Death Valley. Results are at several scales, recording diurnal temperature variations, seasonal temperature fluctuations, and longer-term warming and cooling events that correlate with major changes in the sedimentary environment related to climate. This technique is uniquely instrumental for paleoclimate studies because it offers actual, not just proxy, paleotemperature data. 27 refs., 17 figs.

Roberts, S.M.; Spencer, R.J. [Univ. of Calgary, Alberta (Canada)] [Univ. of Calgary, Alberta (Canada)

1995-10-01T23:59:59.000Z

277

Energy in density gradient  

E-Print Network [OSTI]

Inhomogeneous plasmas and fluids contain energy stored in inhomogeneity and they naturally tend to relax into lower energy states by developing instabilities or by diffusion. But the actual amount of energy in such inhomogeneities has remained unknown. In the present work the amount of energy stored in a density gradient is calculated for several specific density profiles in a cylindric configuration. This is of practical importance for drift wave instability in various plasmas, and in particular in its application in models dealing with the heating of solar corona because the instability is accompanied with stochastic heating, so the energy contained in inhomogeneity is effectively transformed into heat. It is shown that even for a rather moderate increase of the density at the axis in magnetic structures in the corona by a factor 1.5 or 3, the amount of excess energy per unit volume stored in such a density gradient becomes several orders of magnitude greater than the amount of total energy losses per unit ...

Vranjes, J

2015-01-01T23:59:59.000Z

278

Astronomy in Aboriginal culture  

Science Journals Connector (OSTI)

......October 2006 research-article Features Astronomy in Aboriginal culture To some indigenous...undertaking a national project on Aboriginal astronomy. His latest book with Jenny Bhathal, Australian Backyard Astronomy, will be published in September 2006......

Ragbir Bhathal

2006-10-01T23:59:59.000Z

279

Women in astronomy  

Science Journals Connector (OSTI)

......research-article Features Women in astronomy Judith Perry lecturer Chris Done PPARC...Fellow in the Department of Physics and Astronomy Carolin Crawford Royal Society Research Fellow Institute of Astronomy, Cambridge University of Durham Institute......

Judith Perry; Chris Done; Carolin Crawford

1999-06-01T23:59:59.000Z

280

Handling uncertainty in science  

Science Journals Connector (OSTI)

...techniques to predict uncertainty in...techniques used to predict uncertainty in...economy, or of the outbreak of life-threatening pandemic flu, have parallels...weather forecast model. (b) Example...ocean-atmosphere model. Source: European...

2011-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "antiknock in dex" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
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281

Solar Concentration in Space  

Science Journals Connector (OSTI)

Solar concentrators go space. Lens and mirror-based solar concentrators have recently begun to boost photovoltaic power supplies for satellites in space. In 1998, the first mission carrying solar concentrators...

Dr. Ralf Leutz; Dr. Akio Suzuki

2001-01-01T23:59:59.000Z

282

Topics in Approximation Algorithms  

E-Print Network [OSTI]

2.1.2) in our study. We use set cover benchmark inputs [3,problems and the fractional set cover problem. We use thethe vertex cover in this bipartite graph. Set packing: The

Khare, Monik

2012-01-01T23:59:59.000Z

283

Remote Sensing in Development  

Science Journals Connector (OSTI)

...social development in Tanzania. Mainland Tanzania is ad-ministratively divided into 20...encounters methods of manip-ulating solar reflectance values to bring out spectral...these planets were formed. In the outer solar system, evidence indicates that large...

Charles K. Paul; Adolfo C. Mascarenhas

1981-10-09T23:59:59.000Z

284

COMBINATORIAL OPTIMIZATION IN TELECOMMUNICATIONS  

E-Print Network [OSTI]

COMBINATORIAL OPTIMIZATION IN TELECOMMUNICATIONS MAURICIO G. C. RESENDE Abstract. Combinatorial to optimally design a SONET ring network. The last problem comes up when planning a global telecommunications network. 1. Introduction Combinatorial optimization problems are abundant in the telecommunications

Resende, Mauricio G. C.

285

Virtual planetarium in cyberstage  

Science Journals Connector (OSTI)

We describe an educational application in virtual environment, intended for teaching and demonstration of basics of astronomy. The application includes 3D models of 30 objects in the Solar System, 3200 nearby stars, a large database, containing textual ...

Valery Burkin; Martin Gbel; Frank Hasenbrink; Stanislav Klimenko; Igor Nikitin; Henrik Tramberend

2000-06-01T23:59:59.000Z

286

In Case of Emergency  

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

In Case of Emergency In Case of Emergency Print FirePolice Emergency: ext. 7911 Cell phone or off-site: 510-486-7911 When dialing from off-site, the following numbers need to be...

287

Research in Biotechnology and  

E-Print Network [OSTI]

Research in Biotechnology and Biomolecular Engineering at the University of Illinois PROTEIN, CELL-Champaign, has a growing research focus in Biotechnology and Biomolecular Engineering. More than half processes, tissue engineering, the development of sophisticated imaging techniques for biotechnology

Ma, Yi

288

Three essays in macroeconomics  

E-Print Network [OSTI]

This thesis is a collection of three essays on international trade and economic growth. Chapter 1 analyzes the dynamic gains from trade in a Hecksher-Ohlin economy with endogenous factor accumulation. In a framework where ...

Auer, Raphael Anton Maximilian Peter Gabriel

2006-01-01T23:59:59.000Z

289

Nuclear energy in Argentina  

Science Journals Connector (OSTI)

After early interest in the possible uses of uranium in 1937, Argentina's scientists and politicians showed an inclination to support nuclear development that has kept quite steady compared with other areas. The Argentinean government prohibited the export of uranium in 1945, because of the emerging possibility of producing nuclear energy. The creation of the Atomic Energy Commission soon followed, and the first experimental reactor was set critical in 1958. Since then, nuclear development has allowed the successful operation of two nuclear power reactors, a quite integrated nuclear fuel cycle, and sustained activity in the development, production and use of radioisotopes. Nowadays an Argentinean company competes with success in the experimental nuclear reactor market. After a period in which the nuclear sector has been largely ignored in the official interest, Argentina's authorities have launched a comprehensive plan intended to rehabilitate all aspects of nuclear activity.

Gabriel N. Barcelo

2007-01-01T23:59:59.000Z

290

Frontiers in Reactor Engineering  

Science Journals Connector (OSTI)

...conversion in supercritical water, chemical looping combustion, carbon dioxide sequestration...scientific basis for conducting chemical transformations in an environmentally...and biomass gasification, chemical looping combustion, and redox catalysis. The...

Milorad P. Dudukovic

2009-08-07T23:59:59.000Z

291

Holes in Spectral Lines  

E-Print Network [OSTI]

The decay of an atom in the presence of a static perturbation is investigated. The perturbation couples a decaying state with a nondecaying state. A "hole" appears in the emission line at a frequency equal to the frequency ...

Fontana, Peter R.; Srivastava, Rajendra P.

1973-06-01T23:59:59.000Z

292

Enterococci in the Environment  

Science Journals Connector (OSTI)

...combined treatment: a pilot plant study. Water Res. 37...Optical characteristics of waste stabilization ponds: recommendations...2003. Disinfection in a pilot-scale pond system (APS...indicator microorganisms in waste stabilisation ponds. Water...

Muruleedhara N. Byappanahalli; Meredith B. Nevers; Asja Korajkic; Zachery R. Staley; Valerie J. Harwood

2012-12-01T23:59:59.000Z

293

Fluids in Hydrocarbon Basins  

Science Journals Connector (OSTI)

...solids as for example wax, may precipitate from...decreasing shear rate. Wax precipitation is common in subsea pipelines used to transport reservoir...decreasing shear rate. Wax precipitation is common in subsea pipelines used to transport reservoir...

Karen S. Pedersen; Peter L. Christensen

294

Electricity Restructuring in Practice  

Science Journals Connector (OSTI)

Severe flaws exist in the theoretic case for regulation and practice in electric power is worse than theory predicts. Theory suggests regulation was both unneeded and unlikely to succeed. New Deal initiatives ...

Richard L. Gordon

2002-01-01T23:59:59.000Z

295

Nanotechnology in Sports Medicine  

Science Journals Connector (OSTI)

concept has recently entered into the activities of daily living. Nanotechnology in sports medicine can be defined as the adaptation of all kinds of developments in nanoscale into medicinal applications rel...

Cem Bayram; Cansel I??kl?; Emir Baki Denkba?

2014-09-01T23:59:59.000Z

296

Technological Trends in Automobiles  

Science Journals Connector (OSTI)

...direct-in-jection diesel as the the prime alternative power plant to the gasoline engine. The rotary engine, Stirling engine, and gas turbine were most frequently discussed as prime candidates in the past. The demand for excellent fuel economy...

Emmett J. Horton; W. Dale Compton

1984-08-10T23:59:59.000Z

297

Olefin Autoxidation in Flow  

E-Print Network [OSTI]

Handling hazardous multiphase reactions in flow brings not only safety advantages but also significantly improved performance, due to better mass transfer characteristics. In this paper, we present a continuous microreactor ...

Neuenschwander, Ulrich

298

Safety in Buildings  

E-Print Network [OSTI]

Building codes are essentially sets of safety regulations in respect of structure, fire, and health. They were originally developed in response to frequently demonstrated hazards of structural collapse, catastrophic fires, and the spread of disease...

Hutcheon, N. B.

299

HYDROGEN IN GERMANIUM  

E-Print Network [OSTI]

LBL-7996 of the donors phosphorous and D in pure germaniumspectra of the donors phosphorous and D in crys­ tals grownof the donor D and of phosphorous at three different values

Haller, E.E.

2011-01-01T23:59:59.000Z

300

Canine ehrlichiosis in Connecticut.  

Science Journals Connector (OSTI)

...Research Article Canine ehrlichiosis in Connecticut. L A Magnarelli H J Litwin C J Holland...M Ristic Department of Entomology, Connecticut Agricultural Experiment Station, New...first case of canine ehrlichiosis in Connecticut is reported. A female Brittany spaniel...

L A Magnarelli; H J Litwin; C J Holland; J F Anderson; M Ristic

1990-02-01T23:59:59.000Z

Note: This page contains sample records for the topic "antiknock in dex" 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

Interface Magnetism in Multiferroics  

E-Print Network [OSTI]

1.2.1 Magnetism . . . . . . . . . . . . . . . . . . . 1.2.2domain walls . . . . . 3 Magnetism of domain walls in BiFeOof electrical control of magnetism in mixed phase BiFeO 3

He, Qing

2011-01-01T23:59:59.000Z

302

Automation in biological crystallization  

Science Journals Connector (OSTI)

Automation is the response to overcoming the crystallization bottleneck in biological crystallography. This review provides a summary of the current methods and technologies applied in automated platforms for the setup of initial and follow-up crystallization experiments.

Shaw Stewart, P.

2014-05-28T23:59:59.000Z

303

SSL in America  

Broader source: Energy.gov [DOE]

Although you do not often hear about growth in domestic manufacturing here in the United States, the solid-state lighting industry is steadily growing and establishing a manufacturing presence here at home. Solid-state lighting was not only born of U.S. ingenuity and R&D, it is also riding the crest of a worldwide trend toward greater energy efficiency. This offers a golden opportunity for U.S. manufacturing to take a significant role in SSL. From time to time, the Postings focus on SSL companies manufacturing here in the U.S., in a series called "SSL in America." This is not intended to endorse or promote any of the companies, but rather to describe advances in energy-efficient solid-state lighting. The activities you'll read about here are consistent with the U.S. Department of Energy (DOE) white paper "Keeping Manufacturing in the United States."

304

In situ measurement system  

DOE Patents [OSTI]

A multipurpose in situ underground measurement system comprising a plurality of long electrical resistance elements in the form of rigid reinforcing bars, each having an open loop hairpin configuration of shorter length than the other resistance elements. The resistance elements are arranged in pairs in a unitized structure, and grouted in place in the underground volume. Measurement means are provided for obtaining for each pair the electrical resistance of each element and the difference in electrical resistance of the paired elements, which difference values may be used in analytical methods involving resistance as a function of temperature. A scanner means sequentially connects the resistance-measuring apparatus to each individual pair of elements. A source of heating current is also selectively connectable for heating the elements to an initial predetermined temperature prior to electrical resistance measurements when used as an anemometer.

Lord, D.E.

1980-11-24T23:59:59.000Z

305

Advertising in computer games  

E-Print Network [OSTI]

This paper suggests advertisers should experiment with in-game advertising to gain skills that could become vital in the near future. It compiles, arranges and analyzes the existing body of academic and industry knowledge ...

Vedrashko, Ilya

2006-01-01T23:59:59.000Z

306

Essays in financial econometrics  

E-Print Network [OSTI]

Chapter 1 is the product of joint work with Ferhat Akbas and it provides a behavioral explanation for monthly negative serial correlation in stock returns. For the first time in the literature, this work reports that only ...

Kocatulum, Emre

2008-01-01T23:59:59.000Z

307

Specific light in sculpture  

E-Print Network [OSTI]

Specific light is defined as light from artificial or altered natural sources. The use and manipulation of light in three dimensional sculptural work is discussed in an historic and contemporary context. The author's work ...

Powell, John William

1989-01-01T23:59:59.000Z

308

Advances in Soybean Genomics  

Science Journals Connector (OSTI)

A total of 25 QTLs were identified to be validated in different genetic backgrounds and thus they can be utilized confidently in marker assisted breeding. The highest percentage of QTLs confirmed was for pest ...

Milind B. Ratnaparkhe Ph.D.; S. V. Ramesh Ph.D.

2014-01-01T23:59:59.000Z

309

In the Hot Seat  

Science Journals Connector (OSTI)

...one hurricane, drought, or flood to climate change is shaky...Administration (NOAA) in Boulder, Colorado. It depends. Global...in the 2007 assessment), floods, and tropical storms...the University of Colorado, Boulder. Uncertainties and unknowns...

Richard A. Kerr

2013-11-08T23:59:59.000Z

310

In the Hot Seat  

Science Journals Connector (OSTI)

...one hurricane, drought, or flood to climate change is shaky...Administration (NOAA) in Boulder, Colorado. It depends. Global warming...in the 2007 assessment), floods, and tropical storms...Jr., of the University of Colorado, Boulder. Uncertainties and...

Richard A. Kerr

2013-11-08T23:59:59.000Z

311

Plastic Flow in Glass  

Science Journals Connector (OSTI)

...1964 research-article Plastic Flow in Glass D. M. Marsh The classical brittle fracture...account for the mechanical properties of glasses, but the widespread evidence of plastic flow in all glass fracture phenomena even at room temperature...

1964-01-01T23:59:59.000Z

312

Immunochemistry in Cancer Research  

Science Journals Connector (OSTI)

...Research bearing on host resistance. It is in the estimation...and HANSEN,W. H. Resistance to Tumor Implantation...269-75, 1953. 3. . Resistance of Mice to Multiple...Reactions in Agar. II. Elementary Theory and Determination...

Otto J. Plescia

1956-09-01T23:59:59.000Z

313

Excitons in Metals  

Science Journals Connector (OSTI)

It is shown that exciton states exist in metals, occurring near the interband threshold in optical absorption and substantially altering the shape and strength of the absorption edge. Their relation to the corresponding donor states is discussed.

G. D. Mahan

1967-03-20T23:59:59.000Z

314

Biomaterials research in Japan  

Science Journals Connector (OSTI)

...introduction Introduction 1004 23 Biomaterials research in Japan Tadashi Kokubo * * Author for correspondence ( kokubo...1200 Matsumoto-cho, Kasugai, Aichi 487-8501, Japan biomaterials|research|Japan|Research into biomaterials in Japan began with...

2009-01-01T23:59:59.000Z

315

Synchronization in complex networks  

SciTech Connect (OSTI)

Synchronization processes in populations of locally interacting elements are in the focus of intense research in physical, biological, chemical, technological and social systems. The many efforts devoted to understand synchronization phenomena in natural systems take now advantage of the recent theory of complex networks. In this review, we report the advances in the comprehension of synchronization phenomena when oscillating elements are constrained to interact in a complex network topology. We also overview the new emergent features coming out from the interplay between the structure and the function of the underlying pattern of connections. Extensive numerical work as well as analytical approaches to the problem are presented. Finally, we review several applications of synchronization in complex networks to different disciplines: biological systems and neuroscience, engineering and computer science, and economy and social sciences.

Arenas, A.; Diaz-Guilera, A.; Moreno, Y.; Zhou, C.; Kurths, J.

2007-12-12T23:59:59.000Z

316

Our world in collision  

Science Journals Connector (OSTI)

... Horbiger saw himself indeed in the line of Julius Robert Mayer, discoverer of conservation of energy, another unrecognized genius.

Reinald Schrder

1993-04-15T23:59:59.000Z

317

Kumar Krishna, in appreciation  

E-Print Network [OSTI]

Kumar Krishna, in appreciation 1 Kumar Krishna, in appreciation Michael S. Engel1,2, David A. Grimaldi2 1 Division of Entomology, Natural History Museum, and Department of Ecology & Evolutionary Biology, 1501 Crestline Drive Suite 140, University... November 2011 | Accepted 8 November 2011 | Published 21 November 2011 Citation: Engel MS, Grimaldi DS (2011) Kumar Krishna, in appreciation. In: Engel MS (Ed) Contributions Celebrating Kumar Krishna. ZooKeys 148: 113. doi: 10.3897/zookeys.148...

Engel, Michael S.; Grimaldi, David

2011-11-21T23:59:59.000Z

318

Modulational effects in accelerators  

SciTech Connect (OSTI)

We discuss effects of field modulations in accelerators, specifically those that can be used for operational beam diagnostics and beam halo control. In transverse beam dynamics, combined effects of nonlinear resonances and tune modulations influence diffusion rates with applied tune modulation has been demonstrated. In the longitudinal domain, applied RF phase and voltage modulations provide mechanisms for parasitic halo transport, useful in slow crystal extraction. Experimental experiences with transverse tune and RF modulations are also discussed.

Satogata, T.

1997-12-01T23:59:59.000Z

319

Innovation Concepts in Healthcare  

SciTech Connect (OSTI)

AbstractDemographic change and advances in medical science pose increased challenges to healthcare systems globally: The economic basis is aging and thus health is becoming more and more a productivity factor. At the same time, with todays new communication possibilities the demand and expectations of effective medical treatment have been increased. This presentation will illustrate the need for the industrialization of healthcare in order to achieve highest results at limited budgets. Thereby, industrialization is not meaning the medical treatment based on the assembly line approach. Rather it is to recognize the cost of medical care as an investment with respective expectations on the return of the investment. Innovations in imaging and pharmaceutical products as well as in processes - that lead to similar medical results, but with lower efforts - are keys in such scenarios.BiographyProf. Dr. Hermann Requardt, 54, is a member of the Managing Board of Siemens AG and Chief Executive Officer of the Healthcare Sector. In addition he is the CTO of Siemens AG and Head of Corporate Technology, the central research department at Siemens.After completing his studies in physics and philosophy at the Darmstadt University of Technology and Johann Wolfgang Goethe University in Frankfurt and receiving a doctorate in biophysics, he worked at the Institute of Aerospace Medicine at the German Aerospace Center.In 1984 he joined the Medical Technology Group of Siemens AG, where he was responsible for projects in the Magnetic Resonance (MR) division. He was appointed head of the division in 1995. From 2001 to 2006, as a member of the Executive Management of the Medical Solutions Group, he was responsible for several areas, including technological development.In 2006 he became a Member of the Siemens Managing Board and head of Corporate Technology. He was additionally appointed as the Sector Healthcare CEO in 2008.Since 2006 he is an honorary professor in physics of the Johann Wolfgang Goethe University in Frankfurt.

None

2011-01-06T23:59:59.000Z

320

Cognitive deficits in depression  

E-Print Network [OSTI]

COGNITIVE DEFICITS IN DEPRESSION A Thesis MARY ELLEN HAINES Submitted to the Office of Graduate Studies of Texas ASM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August 1993 Major Subject...: Psychology COGNITIVE DEFICITS IN DEPRESSION A Thesis by MARY ELLEN HAINES Submitted to Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved as to style and content by argaret P. orris Chair...

Haines, Mary Ellen

2012-06-07T23:59:59.000Z

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


321

In This Issue  

Science Journals Connector (OSTI)

The mammalian odorant receptors (ORs) sense chemicals in the environment and relay that information to the brain. ...

Jason G. Underwood

2014-11-21T23:59:59.000Z

322

Science Activities in Biomass  

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

Activities in Biomass Curriculum: Biomass Power (organic chemistry, genetics, distillation, agriculture, chemicalcarbon cycles, climatology, plants and energy resources...

323

Progress in Superconducting Metamaterials  

E-Print Network [OSTI]

We review progress in the development and applications of superconducting metamaterials. The review is organized in terms of several distinct advantages and unique properties brought to the metamaterials field by superconductivity. These include the low-loss nature of the meta-atoms, their compact structure, their extraordinary degree of nonlinearity and tunability, magnetic flux quantization and the Josephson effect, quantum effects in which photons interact with quantized energy levels in the meta-atom, as well as strong diamagnetism.

Philipp Jung; Alexey V. Ustinov; Steven M. Anlage

2014-03-25T23:59:59.000Z

324

Magnetic susceptibility in QCD  

E-Print Network [OSTI]

Magnetic susceptibility in the deconfined phase of QCD is calculated in a closed form using a recent general expression for the quark gas pressure in magnetic field. Quark selfenergies are entering the result via Polyakov line factors and ensure the total paramagnetic effect, increasing with temperature. A generalized form of magnetic susceptibility in nonzero magnetic field suitable for experimental and lattice measurements is derived, showing a good agreement with available lattice data.

V. D. Orlovsky; Yu. A. Simonov

2014-05-12T23:59:59.000Z

325

Metropolitan problems in Texas  

E-Print Network [OSTI]

to some of the metropolitan areas in Texas. The stucy concludes with alternatives or proposals which might be considered in Texas. The volumes in the Cushing Memorial Library at Texas Aviv. University were the major source of material used... in this study. I am grateful to the personnel of the various divisions of the iv library for their prompt and courteous assistance' I wish to express particular thanks to Yir ~ Calvin Boyer and Mrs. Margaret Wilson of the Cushing Memorial Library who...

Pearson, William Morris

2012-06-07T23:59:59.000Z

326

Optimization in Networks  

E-Print Network [OSTI]

The recent surge in the network modeling of complex systems has set the stage for a new era in the study of fundamental and applied aspects of optimization in collective behavior. This Focus Issue presents an extended view of the state of the art in this field and includes articles from a large variety of domains where optimization manifests itself, including physical, biological, social, and technological networked systems.

Adilson E. Motter; Zoltan Toroczkai

2007-07-07T23:59:59.000Z

327

Ore components in coal  

SciTech Connect (OSTI)

The dependence of the mineral content in coal and concentrates on the degree of metamorphism is analyzed.

Kh.A. Ishhakov [Russian Academy of Sciences, Kemerovo (Russian Federation). Institute of Coal and Coal Chemistry, Siberian Branch

2009-05-15T23:59:59.000Z

328

Innovation Concepts in Healthcare  

ScienceCinema (OSTI)

AbstractDemographic change and advances in medical science pose increased challenges to healthcare systems globally: The economic basis is aging and thus health is becoming more and more a productivity factor. At the same time, with today?s new communication possibilities the demand and expectations of effective medical treatment have been increased. This presentation will illustrate the need for the ?industrialization? of healthcare in order to achieve highest results at limited budgets. Thereby, industrialization is not meaning the medical treatment based on the assembly line approach. Rather it is to recognize the cost of medical care as an investment with respective expectations on the return of the investment. Innovations in imaging and pharmaceutical products as well as in processes - that lead to similar medical results, but with lower efforts - are keys in such scenarios.BiographyProf. Dr. Hermann Requardt, 54, is a member of the Managing Board of Siemens AG and Chief Executive Officer of the Healthcare Sector. In addition he is the CTO of Siemens AG and Head of Corporate Technology, the central research department at Siemens.After completing his studies in physics and philosophy at the Darmstadt University of Technology and Johann Wolfgang Goethe University in Frankfurt and receiving a doctorate in biophysics, he worked at the Institute of Aerospace Medicine at the German Aerospace Center.In 1984 he joined the Medical Technology Group of Siemens AG, where he was responsible for projects in the Magnetic Resonance (MR) division. He was appointed head of the division in 1995. From 2001 to 2006, as a member of the Executive Management of the Medical Solutions Group, he was responsible for several areas, including technological development.In 2006 he became a Member of the Siemens? Managing Board and head of Corporate Technology. He was additionally appointed as the Sector Healthcare CEO in 2008.Since 2006 he is an honorary professor in physics of the Johann Wolfgang Goethe University in Frankfurt.

None

2011-04-25T23:59:59.000Z

329

Frontiers In Quantitative  

E-Print Network [OSTI]

-in-Publication Data: ISBN-13: 978-0-470-29292-1 Printed in the United States of America 10 9 8 7 6 5 4 3 2 1 iv #12;P1 the United States at (317) 572-3993 or fax (317) 572-4002. Wiley also publishes its books in a varietyFrontiers In Quantitative FinanceVolatility and Credit Risk Modeling RAMA CONT #12;P1: a/b P2: c

Cont, Rama

330

Psychology in Germany  

Science Journals Connector (OSTI)

... , held at Leipzig on October 1519, are reviewed in a thoughtful article, Psychology under Hitler by Ooodwin Watson of Columbia University, in School and Society of December ... thought, were conspicuous by their absenceand an opening address emphasised the demand for a psychology which expresses the genuine German spirit. Gestalt concepts were much in evidence and underlying ...

1934-01-20T23:59:59.000Z

331

Intangibility in intertemporal choice  

Science Journals Connector (OSTI)

...role of the pain of paying in real spending behaviour. In a project with Brian Knutson, Elliott Wimmer and Drazen Prelec (Knutson...eds D. D. Raphael A. L. Macfie). Indianapolis, IN: Liberty Fund. Smith, T.G 2004The McDonald's equilibrium: advertising...

2008-01-01T23:59:59.000Z

332

Parliament in Britain  

Science Journals Connector (OSTI)

... the Civil Service Department, said that the functions of these laboratories fall chiefly within the ambit of the new Department for the Environment. By the same token, the Department for ... development in its own establishments in 1970-71. This figure includes expenditure on the Atomic Energy Authority, and it is about the same as the estimated total expenditure in 1968- ...

1970-11-21T23:59:59.000Z

333

Research in Telecommunications  

Science Journals Connector (OSTI)

... modern civilization. Although in certain directions spectacular advances have been made in the development of telecommunications, which includes both radio and land-line signalling, there is more need now than ... this need, the Department of Scientific and Industrial Research formed in 1946 an ad hoc Telecommunications Research Committee under the chairmanship of Sir Stanley Angwin, for the purpose of denning ...

1948-07-10T23:59:59.000Z

334

Graduate Program in Telecommunications  

E-Print Network [OSTI]

Graduate Program in Telecommunications and Networking #12;Why Telecommunications and Networking? The future of telecommunications lies in unified communication systems that call for increasingly at the forefront of education in telecommunications and networking. Our state-of-the-art laboratories and emphasis

Jiang, Huiqiang

335

Detonation in Liquid Explosives  

Science Journals Connector (OSTI)

... Laboratory, on the initiative of Dr. A. H. Davis, into the process of detonation in explosives, the programme including a photographic study of the ... in explosives, the programme including a photographic study of the detonation Waves in transparent liquid explosivesthe sensitivity of some of which can be varied by ...

D. CRONEY

1948-09-25T23:59:59.000Z

336

Marangoni effects in welding  

Science Journals Connector (OSTI)

...problem of it variable weld penetration or cast-to-cast variation...etration in HS casts and reduced penetration in LS casts. Although this...travel speed (Sw) affects the rate of heat input to the weld...energy resulted in increased penetration for HS and MS casts but have...

1998-01-01T23:59:59.000Z

337

programs in climate change  

E-Print Network [OSTI]

existing programs in climate change science and infrastructure. The Laboratory has a 15- year history in climate change science. The Climate, Ocean and Sea Ice Modeling (COSIM) project develops and maintains advanced numerical models of the ocean, sea ice, and ice sheets for use in global climate change

338

Muon capture in hydrogen  

E-Print Network [OSTI]

Theoretical difficulties in reconciling the measured rates for ordinary and radiative muon capture are discussed, based on heavy-baryon chiral perturbation theory. We also examine ambiguity in our analysis due to the formation of p$\\mu$p molecules in the liquid hydrogen target.

S. Ando; F. Myhrer; K. Kubodera

2001-10-30T23:59:59.000Z

339

Isotope Effect in Adhesion  

Science Journals Connector (OSTI)

Isotope Effect in Adhesion ... We report the first observation of an isotope effect in adhesion. ... The results are presented in Figure 3. Clearly, the isotope effect is very significant, substantiating the proposed H-bonding interactions between the PDMS and Si?OH(D) surfaces. ...

Gun Young Choi; Abraham Ulman; Yitzhak Shnidman; Walter Zurawsky; Cathy Fleischer

2000-05-25T23:59:59.000Z

340

Aging in community  

E-Print Network [OSTI]

Baby Boomers are on the brink of retirement. According to U.S. Census Bureau projections, the number of people aged 65 and over will more than double in the coming decades, growing from 35 million in 2000 to 72 million in ...

Fay, Justin (Justin Thomas)

2008-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "antiknock in dex" 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

Hightlights in Proof Theory  

Science Journals Connector (OSTI)

This is a survey of some of the principal developments in proof theory from its inception in the 1920s, at the hands of David Hilbert, up to the 1960s. Hilberts aim was to use this as a tool in his finitary c...

Solomon Feferman Lec. 1.

2000-01-01T23:59:59.000Z

342

Barley Production in Texas.  

E-Print Network [OSTI]

Experimental Results ....................................... 16 Substation No. 6, Denton, Texas 16 Yields of Barley in Fall Sown Field Plat Trials 16 Yields of Barley in Fall Sown Nursery Plat Trials _-__----------- 19 Yields of Barley in Spring Sown... Nursery Plat Trials 19 U. S. Cotton Field Station, Greenville, Texas 19 Substation No. 5, Temple, Texas -------------_----------------------------------- 22 Substation No. 16, Iowa Park, Texas ................................... 24 Substation No. 12...

Dunkle, P. B. (Paul Burtch); Atkins, Irvin Milburn

1941-01-01T23:59:59.000Z

343

Similarity measurement in context  

Science Journals Connector (OSTI)

Context plays a crucial role when measuring the similarity of two concepts. Nonetheless, the modelling of context has been mostly neglected in existing similarity measurement theories. In this paper, we explore the influence of context in existing similarity ... Keywords: context, geospatial concepts, similarity measurement

Carsten Keler

2007-08-01T23:59:59.000Z

344

Oscillations in Ionized Gases  

Science Journals Connector (OSTI)

...the mercury arc, the free...to me that electric oscillations...occur, and electric waves may result...low pressure discharges in air with...In a mercury arc or a discharge with a hot...whereas the electric field in accord...

Irving Langmuir

1928-01-01T23:59:59.000Z

345

NANOTECHNOLOGY IN BIOLOGY AND  

E-Print Network [OSTI]

NANOTECHNOLOGY IN BIOLOGY AND MEDICINE Methods, Devices, and Applications #12;CRC Press Taylor to infringe. Library of Congress Cataloging-in-Publication Data Nanotechnology in biology and medicine. paper) 1. Nanotechnology. 2. Biomedical engineering. 3. Medical technology. I. Vo-Dinh, Tuan. [DNLM: 1

Pennycook, Steve

346

GEOLOGY IN SCHOOLS  

Science Journals Connector (OSTI)

...work in the country and the collecting serves primarily to consolidate the observation work. (Of course we have to bear in mind...infilling of plasticine. Afterwards a negative can be prepared in plaster and this forms a permanent negative. Fresh positives can...

347

Photosensory behavior in procaryotes.  

Science Journals Connector (OSTI)

...times the cell length, and can be visualized in a strong xenon lamp light beam (Fig. 3). In contrast to other bacteria...Rotation of the fibrils could produce tiny undulations or oscillations discussed above that propel the filament. In fact, shear...

D P Hder

1987-03-01T23:59:59.000Z

348

Trends in Climatology  

Science Journals Connector (OSTI)

...ac-cumulating from Texas Towers offshore, but a climatological...westerly component of the wind in meters per second in...indicate prevailing easterly winds. Left section shows values...They cause the trade winds, the westerlies, the...fac-tor is important in farm management and irrigation...

H. E. Landsberg

1958-10-03T23:59:59.000Z

349

HELPING STUDENTS IN DISTRESS  

E-Print Network [OSTI]

HELPING STUDENTS IN DISTRESS A FACULTY & STAFF GUIDE FOR ASSISTING STUDENTS IN NEED UNIVERSITY high rates of recovery if appropriate help is received in time. Unfortunately, many students fail to get the help they need for any number of reasons, including lack of knowledge about the early signs

Hill, Wendell T.

350

Magnetism in microquasars  

Science Journals Connector (OSTI)

...Lynden-Bell, E. R. Priest and N. O. Weiss Magnetism in microquasars I. F. Mirabel Centre...binaries|magnetic field|plasma physics| Magnetism in microquasars By I. F. Mirabel Centre...Trans. R. Soc. Lond. A (2000) Magnetism in microquasars 843 At rst glance it...

2000-01-01T23:59:59.000Z

351

Magnetism in microquasars  

Science Journals Connector (OSTI)

...companion star in the binary system. In quasars the accretion...into a collimated jet. This collimation is proposed to be achieved...in a coupled- jet{disc system (Falcke et al. 1993...aros & Rees 1997). High collimation (Dar 1998; Pugliese et al...

2000-01-01T23:59:59.000Z

352

Administrative morality in Colombia  

E-Print Network [OSTI]

for Improving Efficiency and Transparency in Public Contracting," (Bogot2002). 13 Presidencia de la Repblica, "Observatorio Anticorrupcin," http://www.anticorrupcion.gov.co/educacion/. 5...ADMINISTRATIVE MORALITY IN COLOMBIA By Copyright 2013 Angela Mara Pez Murcia Submitted to the graduate degree program in Public Affairs and Administration and the Graduate...

Paez Murcia, Angela Maria

2013-05-31T23:59:59.000Z

353

In This Issue  

Science Journals Connector (OSTI)

...individuals are not well-prepared to make informed...J.J. Life in geothermal areas during glacial...biodiversity in or near geothermal areas than in other...decreased with distance from geothermal areas, suggesting these...zone of the Gulf of Mexico, potentially exposing...

2014-01-01T23:59:59.000Z

354

Enterococci in the Environment  

Science Journals Connector (OSTI)

...review-article Reviews Enterococci in the Environment Muruleedhara N. Byappanahalli a Meredith...understanding of their ecology in natural environments, as well as their roles as opportunistic...interactions that occur in aquatic environments. Furthermore, the use of single laboratory-grown...

Muruleedhara N. Byappanahalli; Meredith B. Nevers; Asja Korajkic; Zachery R. Staley; Valerie J. Harwood

2012-12-01T23:59:59.000Z

355

PACE in Texas 101  

E-Print Network [OSTI]

to be available in many Texas regions in 2015. What is PACE and is there PACE in Texas? ESL-KT-14-11-35 CATEE 2014: Clean Air Through Efficiency Conference, Dallas, Texas Nov. 18-20 PACE tackles key barriers Source: Institute for Building Efficiency ESL-KT-14...

Stone,R.

2014-01-01T23:59:59.000Z

356

Science in science fiction  

Science Journals Connector (OSTI)

Science fiction, from Star Trek to Star Wars, is hugely popular and pupils will surely have encountered good and bad physics there, but do they really notice? Discussing the science implied in books and movies, such as in the use of transporters, can be a good way of getting students interested in physics.

Jonathan Allday

2003-01-01T23:59:59.000Z

357

Earnings Fall In Japan  

Science Journals Connector (OSTI)

Earnings Fall In Japan ... Japans economy expanded at an annualized rate of 3.5% in the first three months of 2013, but its chemical industry did not benefit from this growth. ... For the fiscal year that ended on March 31, most of Japans large chemical companies reported earnings lower than in the previous fiscal year or even losses. ...

JEAN-FRANOIS TREMBLAY

2013-05-20T23:59:59.000Z

358

Electric Services in Buildings  

Science Journals Connector (OSTI)

... Institution of Electrical Engineers on October 22. In the early days, electrical installations in buildings were for lighting and bells. Wood casing was used, and, so far as ... equipment were placed anywhere where they would be out of sight. Now new and larger buildings are being erected all over the country, and electrical contractors are having difficulty in ...

1936-10-31T23:59:59.000Z

359

Giardia Cysts in Wastewater Treatment Plants in Italy  

Science Journals Connector (OSTI)

...global level. The recycling of treated wastewaters...investigation in four wastewater treatment plants in...Giardia cysts in wastewater treatment plants in...global level. The recycling of treated wastewaters...investigation in four wastewater treatment plants in...

Simone M. Cacci; Marzia De Giacomo; Francesca A. Aulicino; Edoardo Pozio

2003-06-01T23:59:59.000Z

360

Recent Trends in Land Tenure in Texas.  

E-Print Network [OSTI]

and a live- stock program was instituted. Long term cash leases presented problems during this period of fluctuating commodity prices, One- year farm rental agreements, on the other hand, failed to provide the necessary inducements for the long... ............................................................................. 24 Effect of changes in land tenure on community institutions .................... 25 Landlord-tenant relations ........................................................................................ 26 Farm rental agreements...

Motheral, Joe

1944-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "antiknock in dex" 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

Electric in Discharge in Gases1  

Science Journals Connector (OSTI)

... II. THE form of point most favourable to the production of the arc has been minutely investigated by the authors. By turning wires in a lathe to ... diagram (p. 528) show the distances at which, with a given potential, the arc is formed between such a pointand a disc, and between two suchpoints respectively. The ...

1878-09-19T23:59:59.000Z

362

Algorithmic Challenges in Analyzing Big Data* in  

E-Print Network [OSTI]

Project 2003 One of many computational challenges in the Human Genome project: Assemble a puzzle of 27 #12;Gregor Mendel laws of inheritance,"gene" 1866 Watson and Crick DNA Discovery 1953 Genome Project · Key computational challenge: integration Now that we know the human genome sequence, what's next? 16

Shamir, Ron

363

Ferromagnetism in Oxide Semiconductors  

SciTech Connect (OSTI)

In order to become a practical technology, semiconductor spintronics requires the discovery and utilization of ferromagnetic semiconductors which exhibit spin polarization in the majority carrier band at and above room temperature. Intrinsic remanent magnetization would allow spin polarized currents to be propagated in such materials without the need for a continuous magnetic field. However, the discovery and understanding of such materials is proving to be a grand challenge in solid-state science. Indeed, one of the 125 critical unanswered scientific questions recently posed in Science magazine asks, Is it possible to create magnetic semiconductors that work at room temperature?

Chambers, Scott A.; Droubay, Timothy C.; Wang, Chong M.; Rosso, Kevin M.; Heald, Steve M.; Schwartz, S. A.; Kittilstved, Kevin R.; Gamelin, Daniel R.

2006-11-01T23:59:59.000Z

364

9 - Structures in Matlab  

Science Journals Connector (OSTI)

This chapter explains both structures and vectors of structures in Matlab. The chapter starts by explaining the need for a structure class in programming usage and how structures can be used to improve the readability of Matlab programs. A number of examples that explain structures in Matlab are given here. The chapter concludes with the fox and rabbit game project. The reader is encouraged here to program this game using structures in order to gain an in-depth understanding of their use and value. Keywords Structures, vectors of structures, fox and rabbit game

Munther Gdeisat; Francis Lilley

2013-01-01T23:59:59.000Z

365

CRYSTALLIZATION IN MULTICOMPONENT GLASSES  

SciTech Connect (OSTI)

In glass processing situations involving glass crystallization, various crystalline forms nucleate, grow, and dissolve, typically in a nonuniform temperature field of molten glass subjected to convection. Nuclear waste glasses are remarkable examples of multicomponent vitrified mixtures involving partial crystallization. In the glass melter, crystals form and dissolve during batch-to-glass conversion, melter processing, and product cooling. Crystals often agglomerate and sink, and they may settle at the melter bottom. Within the body of cooling glass, multiple phases crystallize in a non-uniform time-dependent temperature field. Self-organizing periodic distribution (the Liesegnang effect) is common. Various crystallization phenomena that occur in glass making are reviewed.

KRUGER AA; HRMA PR

2009-10-08T23:59:59.000Z

366

Magnetism in hafnium dioxide  

Science Journals Connector (OSTI)

Thin films of HfO2 produced by pulsed-laser deposition on sapphire, yttria-stabilized zirconia, or silicon substrates show ferromagnetic magnetization curves with little hysteresis and extrapolated Curie temperatures far in excess of 400K. The moment does not scale with film thickness, but in terms of substrate area it is typically in the range 150400?Bnm?2. The magnetization exhibits a remarkable anisotropy, which depends on texture and substrate orientation. Pure HfO2 powder develops a weak magnetic moment on heating in vacuum, which is eliminated on annealing in oxygen. Lattice defects are the likely source of the magnetism.

J. M. D. Coey; M. Venkatesan; P. Stamenov; C. B. Fitzgerald; L. S. Dorneles

2005-07-22T23:59:59.000Z

367

Regulation and Moral Hazard in Forest Concessions in Brazil  

E-Print Network [OSTI]

and Forest Concessions in Brazil. Planejamento e Polticaswelfare maximization in Brazil. Rio de Janeiro: IPEA, 1998.in Forest Concessions in Brazil Eduardo A. Tillmann MS.

Balbinotto Neto, Gicomo; Tillmann, Eduardo A; Ratnieks, Ianes

2012-01-01T23:59:59.000Z

368

Singing in the Shower to Shaking in Your Boots  

E-Print Network [OSTI]

Singing in the Shower to Shaking in Your Boots: The science in the Shower to Shaking in Your Boots: The science of emotion Speaking about

Chou, James

369

Evidence of Aliphatics in Nascent Soot Particles in Premixed...  

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

of Aliphatics in Nascent Soot Particles in Premixed Ethylene Flames. Evidence of Aliphatics in Nascent Soot Particles in Premixed Ethylene Flames. Abstract: Chemical composition of...

370

Recent Trends in Car Usage in Advanced Economies - Slower Growth...  

Open Energy Info (EERE)

Trends in Car Usage in Advanced Economies - Slower Growth Ahead? Jump to: navigation, search Tool Summary LAUNCH TOOL Name: Recent Trends in Car Usage in Advanced Economies -...

371

Bird Protection in Illinois  

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

Protection in Illinois Protection in Illinois Nature Bulletin No. 550-A January 18, 1975 Forest Preserve District of Cook County George W. Dunne, President Roland F. Eisenbeis, Supt. of Conservation BIRD PROTECTION IN ILLINOIS Very few people are indifferent about birds. Almost every bird is the feathered friend of somebody or some organization ready to do battle in its behalf. At present, in Illinois, songbirds and most other wild birds, together with their nests and eggs, are completely protected by law at all times. A few kinds, called game birds, may be shot by hunters -- pheasants and quail, also migratory ducks, geese, coots, jacksnipes, woodcocks, and doves. Such hunting must be done with shotguns in certain places in certain open seasons with many other detailed restrictions. Now, even crow hunters are licensed. The only unprotected birds are those three immigrants or exotics: the English sparrow, the European starling and the "domestic " pigeon. These, too, have their friends .

372

Small Particles in Cirrus  

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

Particles in Cirrus Particles in Cirrus Because the reflective properties of ice crystals in cirrus clouds can greatly influence the amount of solar energy that reaches the Earth, scientists use information about the shape and size of ice crystals as input to climate models. These data are obtained by satellite instruments, ground-based sensors, and research aircraft equipped with probes. However, notable discrepancies among these measurements have led to considerable uncertainty in how to represent these properties in climate models. From December 2009 through April 2010, the Atmospheric Radiation Measurement (ARM) Climate Research Facility will sponsor the use of an instrumented aircraft to obtain the most comprehensive set of measurements of ice crystals in cirrus clouds yet obtained. In conjunction with

373

Geothermal development in Australia  

SciTech Connect (OSTI)

In Australia, natural hot springs and hot artesian bores have been developed for recreational and therapeutic purposes. A district heating system at Portland, in the Otway Basin of western Victoria, has provided uninterrupted service for 12 Sears without significant problems, is servicing a building area of 18 990 m{sup 2}, and has prospects of expansion to manufacturing uses. A geothermal well has provided hot water for paper manufacture at Traralgon, in the Gippsland Basin of eastern Victoria. Power production from hot water aquifers was tested at Mulka in South Australia, and is undergoing a four-year production trial at Birdsville in Queensland. An important Hot Dry Rock resource has been confirmed in the Cooper Basin. It has been proposed to build an HDR experimental facility to test power production from deep conductive resources in the Sydney Basin near Muswellbrook.

Burns, K.L. [Los Alamos National Lab., NM (United States); Creelman, R.A. [Creelman (R.A.) and Associates, Sydney, NSW (Australia); Buckingham, N.W. [Glenelg Shire Council, Portland, VIC (Australia); Harrington, H.J. [Australian National Univ., Canberra, ACT (Australia)]|[Sydney Univ., NSW (Australia)

1995-03-01T23:59:59.000Z

374

Household portfolios in Japan  

Science Journals Connector (OSTI)

I provide a detailed description and in-depth analysis of household portfolios in Japan. (1) It is shown that the share of equities in financial wealth and the stock market participation of Japanese households decreased throughout the 1990s. (2) Using survey data, age-related variations in the share of stocks in financial wealth are analyzed. The equity share and stock market participation increase with age among young households, peaking when people reach their 50s, and then stabilizing. However, the share of equities conditional on ownership exhibits no significant age-related pattern, implying that age-related patterns are primarily explained by the decision to hold stocks. A similar mechanism operates to that found in previous studies of Western countries. (3) Owner-occupied housing has a significantly positive effect on stock market participation and on the share of stocks in financial wealth.

Tokuo Iwaisako

2009-01-01T23:59:59.000Z

375

Ethics in science: Recombinant problems  

Science Journals Connector (OSTI)

Ethics in science: Recombinant problems ... Dealing with the pedagogical problems of science in ethics and ethics in science. ... Ethics ...

Robert P. McArthur; Wayne L. Smith

1982-01-01T23:59:59.000Z

376

Neue Arbeit in alten Gehusen  

Science Journals Connector (OSTI)

berall in den Industriestaaten nimmt die Arbeitslosigkeit zu, in den groen Agglomerationen mehr als in Regionen mit Mittel- und Kleinstdten.

Karl Ganser

1998-01-01T23:59:59.000Z

377

New Developments in GIS in Water Resources  

E-Print Network [OSTI]

NWIS ArcGIS Excel Academic Unidata NASA Storet NCDC Snotel Matlab Java Visual Basic Operational services CUAHSI Web Services Data Sources Applications Extract Transform Load http://www.cuahsi.org/his/ We are at a tipping point . Web pages Web... Language (HTML) Water Markup Language (WaterML) GIS and Water Resources WaterML Water Data Language Observations Data Model Observations Data Layers Harvesting water data in GIS CUAHSI Point Observation Data Services 1. Data Loading Put data...

Maidment, David

2008-11-19T23:59:59.000Z

378

Energy Efficiency in Buildings in Switzerland  

E-Print Network [OSTI]

? Sensitivity to the decision procedure Based on experiences observed during these management seminars, the actual IEA annex 40 project of the Swiss shadow group is working to improve the com- petence of managers responsible for operation of the company.... SwissEnergy, Basic principles for optimum operation of complex installa- tions (OCI), EMDZ 805.220.1e, also published in the CD IEA Annex 40 2. SwissEnergy, Cost-efficiency arguments for optimum operation of com- plex installations...

Chuard, J.

2004-01-01T23:59:59.000Z

379

Oxygen in Underwater Cave  

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

Oxygen in Underwater Cave Oxygen in Underwater Cave Name: Natalie Status: student Grade: 9-12 Location: HI Country: USA Date: Spring 2011 Question: Is it possible for there to be free oxygen in an underwater cave? If it is, then how does it work? Replies: Yes it is possible as I have personally experienced. If the cave roof rises to a level above the water, air dissolved in the water will slowly out gas until the water is at the same level at all places. A pocket of breathable air will form. In many caves the roof dips below water level in one place but it above it on both sides. Think of a U shaped tube where the bottom of the U is blocked by water. This is called a siphon and I have passed through many of these to find breathable air on the other side. R. W. "Bob" Avakian Oklahoma State Univ. Inst. of Technology

380

Freezing in Ising ferromagnets  

Science Journals Connector (OSTI)

We investigate the final state of zero-temperature Ising ferromagnets that are endowed with single-spin-flip Glauber dynamics. Surprisingly, the ground state is generally not reached for zero initial magnetization. In two dimensions, the system reaches either a frozen stripe state with probability ?1/3 or the ground state with probability ?2/3. In greater than two dimensions, the probability of reaching the ground state or a frozen state rapidly vanishes as the system size increases; instead the system wanders forever in an isoenergy set of metastable states. An external magnetic field changes the situation drasticallyin two dimensions the favorable ground state is always reached, while in three dimensions the field must exceed a threshold value to reach the ground state. For small but nonzero temperature, relaxation to the final state proceeds first by formation of very long-lived metastable states, as in the zero-temperature case, before equilibrium is reached.

V. Spirin; P.L. Krapivsky; S. Redner

2001-12-18T23:59:59.000Z

Note: This page contains sample records for the topic "antiknock in dex" 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

Foams in porous media  

SciTech Connect (OSTI)

In 1978 a literature search on selective blocking of fluid flow in porous media was done by Professor S.S. Marsden and two of his graduate students, Tom Elson and Kern Huppy. This was presented as SUPRI Report No. TR-3 entitled ''Literature Preview of the Selected Blockage of Fluids in Thermal Recovery Projects.'' Since then a lot of research on foam in porous media has been done on the SUPRI project and a great deal of new information has appeared in the literature. Therefore we believed that a new, up-to-date search should be done on foam alone, one which would be helpful to our students and perhaps of interest to others. This is a chronological survey showing the development of foam flow, blockage and use in porous media, starting with laboratory studies and eventually getting into field tests and demonstrations. It is arbitrarily divided into five-year time periods. 81 refs.

Marsden, S.S.

1986-07-01T23:59:59.000Z

382

Renormalization in reparametrization invariance  

Science Journals Connector (OSTI)

The renormalization issue in the reparametrization invariance in heavy quark effective theory and NRQCD is investigated. I argue that the renormalization of the transformation of the heavy quark field under the variation of the velocity parameter V is attributed to the renormalization of the small component field in the proposed transformation. I derive the matching conditions for determining the renormalized small component field by imposing an infinitesimal transformation of V on the relations between the Greens functions in QCD full theory and those in the effective theory. As an application, I determine the renormalized transformation to order 1/m2 using the matching conditions. The obtained result is in disagreement with that determined by the indirect method.

Yu-Qi Chen

2004-05-18T23:59:59.000Z

383

Quarkonium Production in PHENIX  

E-Print Network [OSTI]

Quarkonia provide a sensitive probe of the properties of the hot dense medium created in high energy heavy ion collisions. Hard scattering processes result in the production of heavy quark pairs that interact with the collision medium during hadronization. These in medium interactions convey information about the fundamental properties of the medium itself and can be used to examine the modification of the QCD confining potential in the collision environment. Baseline measurements from the d+Au and p+p collision systems can be used to distinguish cold nuclear matter effects while measurements from heavy ion collision systems, Au+Au and Cu+Cu, can be used to quantify in-medium effects. PHENIX results for the production of the $J/\\psi$ for a diverse set of collision systems and energies and for the $\\Upsilon$ in p+p collisions are presented.

Abigail Bickley; for the PHENIX Collaboration

2007-01-22T23:59:59.000Z

384

Cosmic rays in astrospheres  

E-Print Network [OSTI]

Cosmic rays passing through large astrospheres can be efficiently cooled inside these "cavities" in the interstellar medium. Moreover, the energy spectra of these energetic particles are already modulated in front of the astrospherical bow shocks. We study the cosmic ray flux in and around lambda Cephei as an example for an astrosphere. The large-scale plasma flow is modeled hydrodynamically with radiative cooling. We studied the cosmic ray flux in a stellar wind cavity using a transport model based on stochastic differential equations. The required parameters, most importantly, the elements of the diffusion tensor, are based on the heliospheric parameters. The magnetic field required for the diffusion coefficients is calculated kinematically. We discuss the transport in an astrospheric scenario with varying parameters for the transport coefficients. We show that large stellar wind cavities can act as sinks for the galactic cosmic ray flux and thus can give rise to small-scale anisotropies in the direction to...

Scherer, Klaus; Bomans, Dominik; Ferreira, Stefan; Fichtner, Horst; Kleimann, Jens; Strauss, Dutoit; Weis, Kerstin; Wiengarten, Tobias; Wodzinski, Thomas

2015-01-01T23:59:59.000Z

385

Cell manipulation in microfluidics  

Science Journals Connector (OSTI)

Recent advances in the lab-on-a-chip field in association with nano/microfluidics have been made for new applications and functionalities to the fields of molecular biology, genetic analysis and proteomics, enabling the expansion of the cell biology field. Specifically, microfluidics has provided promising tools for enhancing cell biological research, since it has the ability to precisely control the cellular environment, to easily mimic heterogeneous cellular environment by multiplexing, and to analyze sub-cellular information by high-contents screening assays at the single-cell level. Various cell manipulation techniques in microfluidics have been developed in accordance with specific objectives and applications. In this review, we examine the latest achievements of cell manipulation techniques in microfluidics by categorizing externally applied forces for manipulation: (i) optical, (ii) magnetic, (iii) electrical, (iv) mechanical and (v) other manipulations. We furthermore focus on history where the manipulation techniques originate and also discuss future perspectives with key examples where available.

Hoyoung Yun; Kisoo Kim; Won Gu Lee

2013-01-01T23:59:59.000Z

386

Coherence in Microchip Traps  

Science Journals Connector (OSTI)

We report the coherent manipulation of internal states of neutral atoms in a magnetic microchip trap. Coherence lifetimes exceeding 1s are observed with atoms at distances of 5130????m from the microchip surface. The coherence lifetime in the chip trap is independent of atom-surface distance within our measurement accuracy and agrees well with the results of similar measurements in macroscopic magnetic traps. Because of the absence of surface-induced decoherence, a miniaturized atomic clock with a relative stability in the 10-13 range can be realized. For applications in quantum information processing, we propose to use microwave near fields in the proximity of chip wires to create potentials that depend on the internal state of the atoms.

Philipp Treutlein; Peter Hommelhoff; Tilo Steinmetz; Theodor W. Hnsch; Jakob Reichel

2004-05-21T23:59:59.000Z

387

In Other News  

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

In Other News In Other News Community Connections: Our link to Northern New Mexico Communities Latest Issue:Dec. 2013 - Jan. 2014 All Issues » submit In Other News LANL employee chosen for "Frontiers of Engineering" Symposium; 16th Annual Hazmat Challenge strengthens response skills. September 1, 2012 dummy image Read our archives Contacts Editor Linda Anderman Email Community Programs Office Kurt Steinhaus Email LANL Employee Chosen for "Frontiers of Engineering" Symposium Only 78 of the nation's brightest young engineers were selected to participate in the 18th Annual U.S. Frontiers in Engineering symposium, and Nathan Moody, who works for the Lab's High Power Electrodynamics group in the Accelerator Operations and Technology Division, will be one of them.

388

Viscosity in modified gravity  

E-Print Network [OSTI]

A bulk viscosity is introduced in the formalism of modified gravity. It is shown that, on the basis of a natural scaling law for the viscosity, a simple solution can be found for quantities such as the Hubble parameter and the energy density. These solutions may incorporate a viscosity-induced Big Rip singularity. By introducing a phase transition in the cosmic fluid, the future singularity can nevertheless in principle be avoided.

Iver Brevik

2012-11-12T23:59:59.000Z

389

Cognitive Naturalism in Metaethics  

E-Print Network [OSTI]

intrinsic desires might be extinguished or their strength significantly reduced, or entirely new ones generated, in the process of adequate consideration. What psychological mechanisms could account for this I do not know. But if such a thing ever occurs..., if one wished to assert that this latter sort of claim was, in addition, normatively overriding, one need only additionally assert that the positive motivation that would be generated or sustained in every rational agent by his or her adequate...

Kelley, Leigh B.

1989-06-01T23:59:59.000Z

390

Hot Topics in astrophysics  

Science Journals Connector (OSTI)

Three current topics in astrophysics are described on the occasion of the joint meeting of the AAPT and the American Astronomical Society (Jan. 7-11 2001) in San Diego CA. They are the habitability of Mars (evidence for ancient and contemporary water and indications of current volcanism);black holes and their intimate relationship with galaxy bulges including their involvement in the x-ray background; and the nature and origin of gamma-ray bursts.

Stephen P. Maran

2000-01-01T23:59:59.000Z

391

Rice consumption in China  

E-Print Network [OSTI]

RICE CONSUMPTION IN CHINA A Thesis by JIN LAN Submitted to the Office of Graduate Studies of Texas ASM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE August 1989 Major Subject: Agricultural... Economics RICE CONSUMPTION IN CHINA A Thesis by JIN LAN Approved as to style and content by: E, We ey F. Peterson (Chair of Committee) James E. Christiansen (Member) Carl Shaf (Member) Daniel I. Padberg (Head of Department) August 1989...

Lan, Jin

2012-06-07T23:59:59.000Z

392

Bremsstrahlung in ? decay  

Science Journals Connector (OSTI)

A quantum mechanical analysis of the bremsstrahlung in ? decay of 210Po is performed in close reference to a semiclassical theory. We clarify the contribution from the tunneling, mixed, outside barrier regions, and from the wall of the inner potential well to the final spectral distribution, and discuss their interplay. We also comment on the validity of semiclassical calculations, and the possibility to eliminate the ambiguity in the nuclear potential between the alpha particle and daughter nucleus using the bremsstrahlung spectrum.

N. Takigawa; Y. Nozawa; K. Hagino; A. Ono; D. M. Brink

1999-02-01T23:59:59.000Z

393

Tritium in amorphous silicon  

SciTech Connect (OSTI)

Preliminary results on infrared and luminescence measurements of tritium incorporated amorphous silicon are reported. Tritium is an unstable isotope that readily substitutes hydrogen in the amorphous silicon network. Due to its greater mass, bonded tritium is found to introduce new stretching modes in the infrared spectrum. Inelastic collisions between the beta particles, produced as a result of tritium decay, and the amorphous silicon network, results in the generation of excess electron-hole pairs. Radiative recombination of these carriers is observed.

Sidhu, L.S.; Kosteski, T.; O`Leary, S.K.; Gaspari, F.; Zukotynski, S. [Univ. of Toronto, Ontario (Canada). Dept. of Electrical and Computer Engineering; Kherani, N.P.; Shmadya, W. [Ontario Hydro Technologies, Toronto, Ontario (Canada)

1996-12-31T23:59:59.000Z

394

Idiopathic Scoliosis in Adolescents  

Science Journals Connector (OSTI)

...spastic quadriplegia), dysfunction of the peripheral neuromuscular unit (e.g. muscular dystrophy and spinal muscular atrophy), or combined sensory and motor dysfunction (e.g. syringomyelia). Scoliosis is common in patients with neurofibromatosis and in patients with certain connective-tissue diseases such... Idiopathic scoliosis affects 2% of adolescents. In adolescents with an immature skeleton, bracing is commonly recommended if there is curve progression to 25 to 45 degrees. A randomized trial comparing bracing with watchful waiting is under way.

Hresko M.T.

2013-02-28T23:59:59.000Z

395

Supercurrent in superconducting graphene  

Science Journals Connector (OSTI)

The problem of supercurrent in superconducting graphene is revisited and the supercurrent is calculated within the mean-field model employing the two-component wave functions on a honeycomb lattice with pairing between different valleys in the Brillouin zone. We show that the supercurrent within the linear approximation in the order-parameter-phase gradient is always finite even if the doping level is exactly zero.

N. B. Kopnin and E. B. Sonin

2010-07-13T23:59:59.000Z

396

Quantum Dots in Graphene  

Science Journals Connector (OSTI)

We suggest a way of confining quasiparticles by an external potential in a small region of a graphene strip. Transversal electron motion plays a crucial role in this confinement. Properties of thus obtained graphene quantum dots are investigated theoretically for different types of the boundary conditions at the edges of the strip. The (quasi)bound states exist in all systems considered. At the same time, the dependence of the conductance on the gate voltage carries information about the shape of the edges.

P. G. Silvestrov and K. B. Efetov

2007-01-03T23:59:59.000Z

397

Experimental Theatre in Venezuela  

E-Print Network [OSTI]

4 LATIN AMERICAN THEATRE REVIEW Experimental Theatre in Venezuela The I Jornadas de Bsqueda y Experimentacin Teatral took place March 21-May 19, 1985 in Caracas. Organized by the Centro Latinoamericano de Creacin e Investigacin Teatral... of the festival was to give an opportunity for experimental theatre groups to present their work and thus to show the current tendencies of unconventional theatre in Venezuela. The participating groups (among them Shock Teatral, Contradanza, Taller...

Editors

1985-10-01T23:59:59.000Z

398

Observational learning in horses  

E-Print Network [OSTI]

OBSERVATIONAL LEARNING IN HORSES A Thesis by KATHERINE LOUISE BAER Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER OF SCIENCE May 1979 Major Subject: Animal... Science OBSERVATIONAL LEARNING IN HORSES A Thesis by KATHERINE LOUISE BAER Approved as to style and content by: L7 . 5+~ (Chairma of . C mmittee) ) c r (Mem ) YiNicc CJ ~- (Membeh) (Head of Department May 1979 ABSTRACT Observational...

Baer, Katherine Louise

1979-01-01T23:59:59.000Z

399

Electrotechnologies in Process Industries  

E-Print Network [OSTI]

Processes Motor drives are mainly used in prime movers (pumps, fans, compressors, etc.) and in materials processing and handling (grinders, conveyors, etc.). EPRI develops and promotes technologies such as industrial heat pumps, freeze concentra tion... the need to disseminate the results of its research and development so that they can be applied broadly across the industrial sector. Specific technology transfer activities in process industries include: o Conferences and workshops o Tech...

Amarnath, K. R.

400

Topics in String Phenomenology  

E-Print Network [OSTI]

We consider two questions in string ``phenomenology.'' First, are there any generic string predictions? Second, are there any general lessons which string theory suggests for thinking about low energy models, particularly in the framework of supersymmetry? Among the topics we consider are the squark and slepton spectrum, flavor symmetries, discrete symmetries including $CP$, and Peccei-Quinn symmetries. We also note that in some cases, discrete symmetries can be used to constrain the form of supersymmetry breaking.

Michael Dine

1993-09-23T23:59:59.000Z

Note: This page contains sample records for the topic "antiknock in dex" 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

Muscling In on Depression  

Science Journals Connector (OSTI)

The mental health benefits of physical exercise are well established, and yet the way in which exercise influences the brain to alter mood is not clearly understood. A recent study by Agudelo and colleagues suggests that kynurenine metabolism in skeletal muscle mediates resilience to stress-induced behavior... Physical activity counters anxiety and stress; a recent study in mice uncovers a molecular pathway that underlies this phenomenon.

Harkin A.

2014-12-11T23:59:59.000Z

402

Allometry in pterosaurs  

E-Print Network [OSTI]

THE UNIVERSITY OF KANSAS PALEONTOLOGICAL CONTRIBUTIONS September 11, 1981 Paper 105 ALLOMETRY IN PTEROSAURS' JAMES C. BROWER and JULIA VEINUS Heroy Geology Laboratory, Syracuse University Syracuse, New York 13210 AbstractThe bivariate allometric... equation has been used to study the relation between size and shape in 16 taxa of pterosaurs ranging in mass from about 4 g to an estimated 75 kg. Measurements of various features are related to the mass, which reflects the overall size of the animal. Shaft...

Brower, J. C.; Veinus, J.

1981-09-11T23:59:59.000Z

403

Wildlife in Chicago  

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

650 October 7, 1961 650 October 7, 1961 Forest Preserve District of Cook County John J. Duffy, President Roberts Mann, Conservation Editor David H. Thompson, Senior Naturalist WILDLIFE IN CHICAGO Few people realize that there is enough native wildlife worth mentioning in roaring, jam-packed Chicago, nor that very much of it is left in its fringe of adjoining suburbs. Surprisingly, this is not the case. Just as rural people become accustomed to urban life, some wild birds and mammals have adjusted to city life and are holding their own. A few kinds seem to be more numerous in parts of metropolitan Chicago than they were in those same areas a hundred years ago. The white-tailed deer, long extinct in this part of Illinois, is on the increase in the Chicago region. In recent winters two of them, perhaps chased by dogs, were rescued from the ice on the lake front -- one at Jackson Park and the other in the Calumet region.

404

Innovations in Nuclear Infrastructure  

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

Innovations in Nuclear Infrastructure Innovations in Nuclear Infrastructure and Education (INIE) Innovations in Nuclear Infrastructure and Education (INIE) Presented to the Nuclear Energy Research Advisory Committee Crystal City, Virginia John Gutteridge Director, University Programs Office of Nuclear Energy, Science and Technology September 30 - October 1, 2002 Office of Nuclear Energy, Science and Technology Gutteridge/Sep-Oct_02 INIE-NERAC.ppt (2) INIE The Stimuli .... INIE The Stimuli .... 6 Declining number of operating university research/training reactors 6 Dwindling student population in nuclear engineering 6 Closing or loss of identity of university nuclear engineering programs 6 Looming shortage of nuclear engineering graduates 6 Threat of additional reactor closures -- Cornell, Michigan, MIT

405

Complexity in Big History  

E-Print Network [OSTI]

pressure resulting from nuclear fusion in its core. Anyand thus speeds up the nuclear fusion process. This releasesand thus slows down the nuclear fusion process again. This

Spier, Fred

2011-01-01T23:59:59.000Z

406

Ergonomics in the Biosciences  

E-Print Network [OSTI]

Gilson (ND) Laboratory ergonomics: Things you should knowMason E, Dukes S (2003 ). Ergonomics and cytotechnologists:Ergonomics in the Biosciences Ira Janowitz, PT, CPE Lawrence

Janowitz, Ira

2010-01-01T23:59:59.000Z

407

Gebudetechnische Anlagen in Krankenhusern  

Science Journals Connector (OSTI)

Die gebudetechnischen Anlagen mssen in den energieintensiven Krankenhausbauten die notwendigen Energien und Medien sowie die dazu notwendige Erzeugungs- und Transportinfrastruktur zur Gewhrleistung eines pe...

Fabian Theis

2011-01-01T23:59:59.000Z

408

Astronomy in Ukraine  

E-Print Network [OSTI]

The current and prospective status of astronomical research in Ukraine is discussed. A brief history of astronomical research in Ukraine is presented and the system organizing scientific activity is described, including astronomy education, institutions and staff, awarding higher degrees/titles, government involvement, budgetary investments and international cooperation. Individuals contributing significantly to the field of astronomy and their accomplishments are mentioned. Major astronomical facilities, their capabilities, and their instrumentation are described. In terms of the number of institutions and personnel engaged in astronomy, and of past accomplishments, Ukraine ranks among major nations of Europe. Current difficulties associated with political, economic and technological changes are addressed and goals for future research activities presented.

Ya. V. Pavlenko; I. B. Vavilova; T. Kostiuk

2005-12-16T23:59:59.000Z

409

Architectural disruption in aerospace  

E-Print Network [OSTI]

Distinctive technology and customer / supplier relationships are currently the primary sources of competitive advantage in the Aerospace industry. Modular Open System Architecture (MOSA) requirements represent a significant ...

Ashworth, Geoffrey (Geoffrey John)

2009-01-01T23:59:59.000Z

410

Adventures in Infectious Diseases  

SciTech Connect (OSTI)

Dr. Susan Fisher-Hoch, Virologist and Epidemiologist, will discuss her research and travels associated with viral hemorrhagic fevers. From the Ebola outbreak in Reston, Virginia to outbreaks of Crimean Congo Hemorrhagic Fever in South Africa, Senegal, and Saudi Arabia, Dr. Fisher-Hoch has studied and tracked the pathophysiology of these viral diseases. These studies have led her from the Center for Disease Control in the United States, to Lyon, France where she was instrumental in designing, constructing, and rendering operational a laboratory capable of containing some of the world's most dangerous diseases.

Fisher-Hoch, Susan [University of Texas School of Public Health

2011-11-01T23:59:59.000Z

411

Counterterms in Lovelock Gravity  

E-Print Network [OSTI]

In this paper, we introduce the counterterms that remove the non-logarithmic divergences of the action in third order Lovelock gravity. We do this by defining the cosmological constant in such a way that the asymptotic form of the metric have the same form in Lovelock and Einstein gravities. Thus, we employ the counterterms of Einstein gravity and show that the power law divergences in the action of Lovelock gravity can be removed by suitable choice of coefficients. We find that the dependence of these coefficients on the dimension in Lovelock gravity is the same as in Einstein gravity. We also introduce the finite energy-momentum tensor and employ these counterterms to calculate the finite action and mass of the black hole solutions of third order Lovelock gravity. We calculate the thermodynamic quantities and show that the entropy calculated through the use of Gibbs-Duhem relation is consistent with the obtained entropy by Wald's formula. We, also, find that in contrast to Einstein gravity in which there ex...

Mehdizadeh, M R; Zangeneh, M Kord

2015-01-01T23:59:59.000Z

412

Digital Filters in Telecommunications  

E-Print Network [OSTI]

Gunawan,I.P. Undergraduate thesis written during final year of Bachelor of Engineering Honours in Telecommunications Systems and Management, Cable and Wireless College, Coventry, UK, May 1996.

Gunawan, I.P.

413

Small Cars In Neighborhoods  

E-Print Network [OSTI]

Sperling, quoted in Electric Car Goals Called Feasible,automobile- like electric cars; a much longer and morethose eligible to own electric cars. Because the (eventually

Bosselmann, Peter C.; Cullinane, Daniel; Garrison, William L.; Maxey, Carl M.

1993-01-01T23:59:59.000Z

414

Frontiers in Science Lectures  

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

or Neither? The new science of epigenetics Exploring Mars: Curiosity and its laser Higgs Boson and Beyond: The quest for new laws of physics Frontiers in Science Lectures...

415

NERSC In the News  

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

experiment. Astronomers 'excited' by supernova August 29, 2011 | Source: News24 (South Africa) | Astronomers catch supernova in the act September 7, 2011 | Source: ISGTW |...

416

Ethical Issues in Nanomedicine  

Science Journals Connector (OSTI)

Nanomedicine is a top developing domain. However, ... the main topics pertaining to the ethics in nanomedicine at this time. From issues such as...

F. Graur; R. Elisei; A. Szasz; H. C. Neagos

2011-01-01T23:59:59.000Z

417

2 - Trends in nanomedicine  

Science Journals Connector (OSTI)

Abstract: In this chapter, I will present some general background on nanomedicine, particularly focusing on some of the investment that is being made in this emerging field. The bulk of the chapter, though, will consist of explorations of two areas in which the impacts of nanomedicine are likely to be most significant: diagnostics and medical records and treatment, including surgery and drug delivery. Under each discussion, I will survey some of the ethical and social issues that are likely to arise in these applications.

F. Allhoff

2012-01-01T23:59:59.000Z

418

Future Mobility in Maryland  

National Nuclear Security Administration (NNSA)

Effects in HDM-4. Bennett, C. and Greenwood, I. 2000. 8 Your Driving Costs. American Automobile Association. 2008. 9 U.S. Department of Transportation - Federal Highway...

419

Quasiferromagnetism in semiconductors  

SciTech Connect (OSTI)

Ferromagnetic hysteresis has been observed at room temperature in materials not consisting of elements commonly associated with ferromagnetism, such as Co, Ni, Fe, or Mn-containing alloys. In particular, we report on magnetic hysteresis seen in silicon prepared by two different techniques: ion implantation (Si and Ar) and neutron irradiation. Because the material investigated contains no ferromagnetic elements, we tentatively call it ''quasiferromagnetic.'' The paramagnetic defects present in these materials were investigated using electron paramagnetic resonance. We suggest that these defects are one of the factors responsible for the observed macroscopic magnetic hysteresis loop.

Dubroca, T.; Hack, J.; Hummel, R.E.; Angerhofer, A. [Department of Materials Science and Engineering, University of Florida, Rhines Hall room 106, Gainesville, Florida 32611 (United States); Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, Florida 32611 (United States)

2006-05-01T23:59:59.000Z

420

Weatherized in May 2010  

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

**Homes Weatherized in May 2010 (Recovery Act) Total Number of Homes Weatherized through May 2010 (Recovery Act) ***Total Number of Homes Weatherized Calendar Year 2009 - May 2010...

Note: This page contains sample records for the topic "antiknock in dex" 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

Definability in Physics  

E-Print Network [OSTI]

This paper has been withdrawn because the content has been substantially improved in a later paper, arXiv:0806.1165.

David J. BenDaniel

2006-06-26T23:59:59.000Z

422

Hard physics in PHENIX  

E-Print Network [OSTI]

We review recent results on hard observables in p+p, d+A and A+A collisions obtained by the PHENIX experiment. Emphasis is put on those measurements that provide insight into the properties of hot QCD media expected to be created in nucleus-nucleus collisions at RHIC energies. Direct photon spectra, jet properties and heavy quarks production measured in p+p and d+Au collisions are compared to the same observables extracted in heavy ion collisions to find modifications due to the presence of hot QCD matter.

D. Peressounko; for the PHENIX collaboration

2005-12-08T23:59:59.000Z

423

Computer Forensics In Forensis  

E-Print Network [OSTI]

U.N. In Proceedings of CMAD IV: Computer Misuse and Anomaly4] J. P. Anderson. Computer Security Threat Monitoring andof the Fifth Annual Computer Security Applications

Peisert, Sean; Bishop, Matt; Marzullo, Keith

2008-01-01T23:59:59.000Z

424

Shot Noise in Graphene  

Science Journals Connector (OSTI)

We report measurements of current noise in single-layer and multilayer graphene devices. In four single-layer devices, including a p-n junction, the Fano factor remains constant to within 10% upon varying carrier type and density, and averages between 0.35 and 0.38. The Fano factor in a multilayer device is found to decrease from a maximal value of 0.33 at the charge-neutrality point to 0.25 at high carrier density. These results are compared to theories for shot noise in ballistic and disordered graphene.

L. DiCarlo; J. R. Williams; Yiming Zhang; D. T. McClure; C. M. Marcus

2008-04-14T23:59:59.000Z

425

Quantum pumping in graphene  

Science Journals Connector (OSTI)

We show that graphene-based quantum pumps can tap into evanescent modes, which penetrate deeply into the device as a consequence of Klein tunneling. The evanescent modes dominate pumping at the Dirac point, and give rise to a universal response under weak driving for short and wide pumps, in close analogy to their role in the minimal conductivity in ballistic transport. In contrast, evanescent modes contribute negligibly to normal pumps. Our findings add an incentive for the exploration of graphene-based nanoelectronic devices.

E. Prada; P. San-Jose; H. Schomerus

2009-12-10T23:59:59.000Z

426

Intervalley plasmons in graphene  

Science Journals Connector (OSTI)

The spectrum of two-dimensional (2D) plasma waves in graphene has been recently studied in the Dirac fermion model. We take into account the whole dispersion relation for graphene electrons in the tight-binding approximation and the local-field effects in the electrodynamic response. Near the wave vectors close to the corners of the hexagon-shaped Brillouin zone we find low-frequency 2D plasmon modes with a linear spectrum. These intervalley plasmon modes are related to the transitions between the two nearest Dirac cones.

T. Tudorovskiy and S. A. Mikhailov

2010-08-24T23:59:59.000Z

427

Phonon dispersion in graphene  

Science Journals Connector (OSTI)

Taking into account constraints imposed by the lattice symmetry we calculate analytically [1] the phonon dispersion for graphene with interactions between first and second neighbors. We find that the out?of?plane (bending) modes are not coupled with in?plane modes and described only with two force constants one of which is determined by the corresponding Raman frequency and another by the smallest elastic constant C44. In contrast to calculations by Saito et al we find the linear dispersion of the bending (out?of?plane) mode around the ? point with a small but finite sound velocity =1.57 km/s. The sound velocity of this mode is very sensitive to small variations of the force constants. The sound velocities of in?plane modes are = 20.3 km/s and =13.1 km/s. Because of the lack of information for graphene we compare the present theory with experiments on graphite. The low phonon frequencies in the critical points turn out less than their values in graphite since the atoms in graphene are more free to move in the out?of?plane direction in comparison with graphite. Accuracy of the comparison can be estimated using the value of the observed splitting of the ZA and ZO' modes in graphite which is around 130 1/cm. [1] L.A. Falkovsky cond?mat/0702409.

Leonid A. Falkovsky

2008-01-01T23:59:59.000Z

428

Phonon dispersion in graphene  

E-Print Network [OSTI]

Taking into account the constraints imposed by the lattice symmetry, the phonon dispersion is calculated for graphene with interactions between the first and second nearest neighbors in the framework of the Born-von Karman model. Analytical expressions are obtained for the out-of-plane (bending) modes determined only by two force constants as well as for the in-plane modes with four force constants. Values of the force constants are found in fitting to elastic constants and Raman frequencies observed in graphite.

L. A. Falkovsky

2007-02-17T23:59:59.000Z

429

Diamagnetism in disordered graphene  

Science Journals Connector (OSTI)

The orbital magnetism is studied in graphene monolayer within the effective-mass approximation. In models of short-range and long-range disorders, the magnetization is calculated with self-consistent Born approximation. In the zero-field limit, the susceptibility becomes highly diamagnetic around zero energy, while it has a long tail proportional to the inverse of the Fermi energy. We demonstrated how the magnetic oscillation vanishes and converges to the susceptibility, in going from a strong-field regime to a weak-field regime. The behavior at zero energy is shown to be highly singular.

Mikito Koshino and Tsuneya Ando

2007-06-29T23:59:59.000Z

430

In Other News  

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

- Jan. 2015 All Issues submit In Other News Lecture on Sandia Lab history; LANL Foundation personnel changes. March 1, 2013 Rebbecca Ullrich is Sandia National Laboratories'...

431

Growing Sweetclover in Texas.  

E-Print Network [OSTI]

strips in the blow sand area of South Texas. In North Texas it matures at approximately the same time as Hubam and neither ,the seed nor the plants .- can be distinguished.: Certified seed of Flor- anna should be purchased when possible. An... strips in the blow sand area of South Texas. In North Texas it matures at approximately the same time as Hubam and neither ,the seed nor the plants .- can be distinguished.: Certified seed of Flor- anna should be purchased when possible. An...

Spears, Ben; Coffey, Lee; Trew, E. M.

1957-01-01T23:59:59.000Z

432

Wind power in Brazil.  

E-Print Network [OSTI]

?? As welfare and industry production gets higher the demand for electricity increases. Almost 90 % of the electricity generated in Brazil is from renewable (more)

Elin, Karlsson

2009-01-01T23:59:59.000Z

433

Research in actinide chemistry  

SciTech Connect (OSTI)

This research studies the behavior of the actinide elements in aqueous solution. The high radioactivity of the transuranium actinides limits the concentrations which can be studied and, consequently, limits the experimental techniques. However, oxidation state analogs (trivalent lanthanides, tetravalent thorium, and hexavalent uranium) do not suffer from these limitations. Behavior of actinides in the environment are a major USDOE concern, whether in connection with long-term releases from a repository, releases from stored defense wastes or accidental releases in reprocessing, etc. Principal goal of our research was expand the thermodynamic data base on complexation of actinides by natural ligands (e.g., OH[sup [minus

Choppin, G.R.

1993-01-01T23:59:59.000Z

434

Imaging in Acute Stroke  

E-Print Network [OSTI]

National Institutes of Health stroke scale score in casesof hyperacute carotid ischemic stroke. AJNR Am J Neuroradiolin the evaluation of the subacute stroke patient, due to its

Birenbaum, Dale; Bancroft, Laura W; Felsberg, Gary J

2011-01-01T23:59:59.000Z

435

ELECTRICAL DEVELOPMENTS IN MADRAS  

Science Journals Connector (OSTI)

... has greatly exceeded the most optimistic estimates, and additional plant and extensions to lines and substations had to be installed several years in advance of the original programme.

1941-09-06T23:59:59.000Z

436

Solar heating in Colombia.  

E-Print Network [OSTI]

?? This report describes the process of a thesis implemented in Colombia concerning solar energy. The project was to install a self-circulating solar heating system, (more)

Skytt, Johanna

2012-01-01T23:59:59.000Z

437

Duizendste levertransplantatie in Groningen  

Science Journals Connector (OSTI)

Het Universitair Medisch Centrum Groningen (UMCG) heeft onlangs het heugelijke feit ... 50 tot 60 leverpatinten een nieuwe lever in Groningen. Zonder een lever sterft een mens binnen...

2008-06-01T23:59:59.000Z

438

Photonics in nanotechnology  

Science Journals Connector (OSTI)

Nanotechnology, the use of the unique characteristics of nanoscale structures in a wide variety of physical systems, is widely recognized as an important emerging scientific and...

Brueck, Steven R

439

Terrorism research in Finland.  

E-Print Network [OSTI]

??In the past decade terrorism has become an increasingly visible part of society and the debate about society. Although Finland has escaped serious incidents of (more)

Jnnes, Veera

2013-01-01T23:59:59.000Z

440

Information processing in spectroscopy  

Science Journals Connector (OSTI)

In all spectroscopic methods, there exists an integral equation relating the observed spectrum and the intensity distribution observed by the spectroscopic instrument. An improved...

Okada, Katsuhiko; Ishibashi, Yoshihiro; Kitade, Atsuo

1989-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "antiknock in dex" 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

Transhumanism in Film.  

E-Print Network [OSTI]

??Technological progress is a defining theme across human history. Man has long relied on technology to influence the world around him. Modern advancements in fields (more)

May, Nathaniel

2014-01-01T23:59:59.000Z

442

Work in Horticulture.  

E-Print Network [OSTI]

ripe n~ildly sub-acid. AJIARELLE BUNT. Another variety of the Red Dnkes much prized in iSorth Sile~ia for dessert use and cooking. A tine grower in orchard and nursery and far hardier tree on onr grounds than Richmond or Eng1i.h Morello; mainly I... 100 TEXAS AGRICU1,TI:RAL EXPERIMENT STATIOS. think on account of its Ixmre perfect foliage. The fruit is highly prized in the markets of Warsaw, Poland. SPATE: AXARXLLE. IIZuc11 grown for dessert and culinary nse in East Poland and Worth Bileam...

Beach, S. A. (Spencer Ambrose)

1891-01-01T23:59:59.000Z

443

In Situ Processing  

E-Print Network [OSTI]

Apr. 2010. [42] Fang Zheng, Hasan Abbasi, Jianting Cao, JaiNobert Podhorszki, and Hasan Abbasi. Enabling In-situis required. References [1] Hasan Abbasi, Greg Eisenhauer,

Childs, Hank

2013-01-01T23:59:59.000Z

444

Excitons in Electrostatic Lattices /  

E-Print Network [OSTI]

modern day photovoltaics, optoelectronics, plasmonics, andand every advance in optoelectronics requires a new level ofdevelopment of both optoelectronics and photovoltaics. The

Remeika, Mikas

2013-01-01T23:59:59.000Z

445

In Other News  

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

Laboratory Latest Issue: Dec. 2014 - Jan. 2015 All Issues submit In Other News Help us make Connections better October 1, 2012 dummy image Read our archives Contacts...

446

Trends in Internet Marketing.  

E-Print Network [OSTI]

??Internet marketing involves the usage of the Internet to market and sell goods or services. In this thesis we wished to seek answers for the (more)

Panchanathan, Nitin

2005-01-01T23:59:59.000Z

447

Optics in Eastern Connecticut  

Science Journals Connector (OSTI)

Through a partnership between EASTCONN, a regional educational service center, and Three Rivers Community College, both located in eastern Connecticut, students from 5th grade through...

Magnani, Nancy; Donnelly, Judith

448

Library legislation in Zambia.  

E-Print Network [OSTI]

??This dissertation investigates and justifies the need for a public library law in Zambia to lay the foundation for the provision and development of public (more)

Kantumoya, Albert

2010-01-01T23:59:59.000Z

449

Energy in the atmosphere  

Science Journals Connector (OSTI)

Order?of?magnitude calculations are made on the energy available in the air above Carlisle Pennsylvania. The energy sources considered are solar wind electrical and thermal. (AIP)

Kenneth L. Laws

1978-01-01T23:59:59.000Z

450

Examinations in Experimental Science  

Science Journals Connector (OSTI)

... You occasionally do us, who are humble teachers of Elementary Science in schools, the very great kindness of giving us, through ...

A. H. F.

1900-11-01T23:59:59.000Z

451

NERSC In the News  

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

Microscopy Reveals 'Atomic Antenna' Behavior in Graphene January 21, 2012 | Reanalysis Project targets once-and-future weather September 29, 2010 | Source: ASCR Discovery | Gil...

452

Corruption in Uganda  

E-Print Network [OSTI]

of corruption in Uganda? Causes and Consequences ofto January 24, 1986, Uganda has lacked exemplary leadership.the Central Bank (Bank of Uganda). If salary and wage rises

Nsibambi, Apolo

1987-01-01T23:59:59.000Z

453

Excitons in Electrostatic Lattices /  

E-Print Network [OSTI]

6.4 Exciton Energy and Intensity Modulation Measurement .6.4: Observable energy and intensity modulation at differentmodulations in energy and intensity (red, right magnified

Remeika, Mikas

2013-01-01T23:59:59.000Z

454

Subjectivity in Expert Advocacy  

Science Journals Connector (OSTI)

Dr. Dinesh Kumar Mishra (born 1946) is a professional... Freedom from Floods Campaign. which is a network of activists engaged in advocacy on flood control .

Ravi Baghel

2014-01-01T23:59:59.000Z

455

Confusion in Thermodynamics  

E-Print Network [OSTI]

For a long time now, confusion has existed in the minds of many over the meaning of various concepts in thermodynamics. Recently, this point has been brought to people's attention by two articles appearing on the well-known archive (arxiv) web site. The content of these two pieces serves to illustrate many of the problems and has occasioned the construction of this answer to at least some of them. The position of the axiom proposed by Carath\\'eodory is central in this matter and here its position is clarified and secured within the framework of thermodynamics. In particular, its relation to the First Law is examined and justified.

Jeremy Dunning-Davies; David Sands

2011-03-02T23:59:59.000Z

456

PROGRESS IN RESEARCH  

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

skin thickness and isospin analogue state in finite nuclei using the mass formula of Danielewicz 8. The yellow solid curve corresponds to the parameterization adopted by...

457

Complementarity in the multiverse  

SciTech Connect (OSTI)

In the multiverse, as in AdS space, light cones relate bulk points to boundary scales. This holographic UV-IR connection defines a preferred global time cutoff that regulates the divergences of eternal inflation. An entirely different cutoff, the causal patch, arises in the holographic description of black holes. Remarkably, I find evidence that these two regulators define the same probability measure in the multiverse. Initial conditions for the causal patch are controlled by the late-time attractor regime of the global description.

Bousso, Raphael [Center for Theoretical Physics, Department of Physics University of California, Berkeley, California 94720-7300 (United States) and Lawrence Berkeley National Laboratory, Berkeley, California 94720-8162 (United States)

2009-06-15T23:59:59.000Z

458

CFIEATINE IN SEAWATER  

Science Journals Connector (OSTI)

of creatine in seawater are described. Data are presented ... Seawater samples from several hydro- graphic stations were .... storage procedure. Manual analysis.

1999-12-25T23:59:59.000Z

459

POLYPHOSPHATE IN SEAWATER  

Science Journals Connector (OSTI)

ware or storage vessels have been washed with polyphosphate-based detergents. Stor- age bottles should be made of glass and presoaked in warm 25

2000-02-10T23:59:59.000Z

460

Gerinnungsmanagement in der Herzchirurgie  

Science Journals Connector (OSTI)

Immer wieder versorgt uns die griechische Mythologie mit allegorischen Antworten auf gegenwrtige Probleme. In Homers Ilias wurde Odysseus mit den beiden Seeungeheuern Skylla und Charybdis konfrontiert, whrend e...

Prof. Dr. J.M. Albes MBA

2014-04-01T23:59:59.000Z

Note: This page contains sample records for the topic "antiknock in dex" 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

Advances in Physical Chemistry  

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

Hindawi Publishing Corporation Advances in Physical Chemistry Volume 2011, Article ID 907129, 18 pages doi:10.11552011907129 Review Article Contrast and Synergy between...

462

In other news  

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

Issue: Dec. 2014 - Jan. 2015 All Issues submit In other news Environmental sustainability, Science Bowl winners and new Pinterest site. April 1, 2013 The Lab's Pinterest...

463

URANIUM IN ALKALINE ROCKS  

E-Print Network [OSTI]

Greenland," in Uranium Exploration Geology, Int. AtomicOklahoma," 1977 Nure Geology Uranium Symposium, Igneous HostMcNeil, M. , 1977. "Geology of Brazil's Uranium and Thorium

Murphy, M.

2011-01-01T23:59:59.000Z

464

Coherence in Oxygenic Photosynthesis  

Science Journals Connector (OSTI)

We report coherent dynamics in the photosystem II reaction center observed by two dimensional electronic spectroscopy. We discuss the physical nature of the coherences and their...

Fuller, Franklin D; Pan, Jie; Gelzinis, Andrius; Butkus, Vytautas; Senlik, Seckin; Wilcox, Daniel E; Valkunas, Leonas; Abramavicius, Darius; Ogilvie, Jennifer P

465

Vision in Bad Weather and in Murky Waters  

E-Print Network [OSTI]

: Teapot in Pure Water #12;Experiments: Teapot in Dilute Milk Low Contrast, Flat Appearance #12;Results

Treuille, Adrien

466

Probability and Statistics Courses in the Universities in China  

E-Print Network [OSTI]

I i Before the ffities, co&ses in statistics were offered only in a few specialities such as medicine and textiles in several universities in China Courses in probability theory

Yan Shi-jian Beijing

467

Trees in the winter  

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

Trees in the winter Trees in the winter Name: John H Hersey Age: N/A Location: N/A Country: N/A Date: N/A Question: Why do some trees in the winter lose their leaves and some are able to keep their leaves? Replies: John, You can view the leaves on a tree as its food manufacturing factory. For some trees, especially those which live in areas which become cold in the winter, the 'factories' do their work during the normal growing season and are forced to 'shut-down' over the winter months. There are many evergreens which hold their foliage all year, simply dropping some of them periodically as they age and become less efficient to be replaced by new needles. Larches in the area where I live are conifers which lose their needles, which is quite rare. You can see that foliage on a tree presents a problem: water loss from a tree is greatest in its foliage. A tree has to 'decide' (and this has occurred over millennia by evolution) whether to hold its foliage or shed it. If it decides to hold the foliage, then it must provide a means of insuring conservation of water, especially in the winter months when dry cold winds remove water which is not easily replace due to liquid water in the environment being frozen. Many plant's adaptation has been the production of a waxy cuticle to 'seal-off' the leaf from the environment and reduce water loss. You can understand that in the northern latitude's winters, sunlight duration and intensity drops, and for some plants the best solution has involved shedding the leaves for the winter, and growing a new set of 'factories' in the spring.

468

Saving energy in mining  

SciTech Connect (OSTI)

The struggle to reduce power costs is relentless in the world of mining. One of the most significant trends has been the use of electric instead of diesel power in such mining vehicles as large capacity dump trucks, hydraulic excavators, and articulated trucks. The hydraulic excavator, due to its selectivity, high breakout force, and maneuverability, has become increasingly popular as the loading unit in conventional shovel and truck operations. However, hydraulic shovels were originally only available as diesel powered units. Electric power for the prime mover is now offered as an option by most manufacturers. This is particularly cost effective with the larger machines. In surface mines, the transport of coal and overburden consumes the most energy. The application of such technology as in-pit crushers and conveyor systems are all aimed at reducing operating costs. A major development in reducing ventilation energy consumption is the Ventcon system based on the idea of distributing ventilation air more effectively around the mine. Ventcon controls the mine's fans and ventilation doors so that airflow is highest where most is required. The use of continuous haulage from the face to the surface is another energy-saving development. In many areas of Appalachia, United States, coal is cut by a continuous miner and hauled directly to the surface by a series of conveyors. The use of aluminum in cage and skip manufacturehas also been proven as an energy-saving technique. All-aluminum man cages are already in use. For the tougher application of hoisting coal, aluminum can be substituted for heavier materials in the construction of skips. In both cases, significant energy savings, and thus reduced hoisting costs, are the result. There is a power saving of more than 100 kilowatts (134 horsepower) for every one ton reduction of skip mass. The energy efficiencies of hydraulic rock drills are higher than pneumatic drills.

Chadwick, J.R.

1982-03-01T23:59:59.000Z

469

Dynamics in Psychology  

Science Journals Connector (OSTI)

... of science would be dark, and the prospects of the applied sciences themselves clouded. Psychology to-day is enjoying an unexpected and dangerous popularity because it has been found useful ... and dangerous popularity because it has been found useful in application. Mental testing, industrial psychology, psychotherapy, these are the fields in which psychologists are considered to justify themselves. ...

A. W. WOLTERS

1943-08-14T23:59:59.000Z

470

In This Issue  

Science Journals Connector (OSTI)

R2oDNA Designer: Computational Design of Biologically Neutral Synthetic DNA Sequences ... In this Technical Note, Casini et al., (DOI: 10.1021/sb4001323) have developed a novel computational algorithm (and accompanying web server: www.r2odna.com) for designing orthogonal biologically neutral synthetic DNA sequences. ... Heuristic for Maximizing DNA Reuse in Synthetic DNA Library Assembly ...

Ranjini Prithviraj

2014-08-15T23:59:59.000Z

471

In loving memory of  

E-Print Network [OSTI]

iv Its hard to believe that I have made it to the end of my graduate career. It seems only yesterday I was sitting in an apartment in Syracuse, NY, submitting grad school applications to 9 different schools for many different programs, and heading out on interviews for real jobs. In the end, I was shocked to be accepted into the PhD program at Caltech. I decided that sink or swim, I had to try my hand at a real engineering school. Im glad I did. The road has not been easy. There are many people that helped me get through the tough days and realize that quitting was not an option. I am grateful for the support and encouragement I found in my family. First, Id like to thank my husband, Ray, for always being there. He has more experience lifting and bolting together UHV equipment than many people in our group. We spent many a weekend and evening opening up my chamber and putting it back together, only to be up all night waiting for a growth to finish. In addition, my Aunt Nancy provided a getaway from Pasadena. Her door was always open for me in San Diego when things got to be too much for me. My grandfather and step-grandmother in Palos Verdes Estates always made sure I never forgot that the beautiful coast was never

Melissa Jane Archer; Melissa Jane Archer; Jane Bellows King

2008-01-01T23:59:59.000Z

472

AAAS Meeting in Indianapolis  

Science Journals Connector (OSTI)

...the Allison Division. The turbine drives at 13,820 revolu-tions per minute a turbine shaft which is connected...tremendous power from the turbine shaft at a reduced speed...obtained in a program in residual stress measurement and effect...

Raymond L. Taylor

1957-12-06T23:59:59.000Z

473

Coal Gasification in Australia  

Science Journals Connector (OSTI)

... P. S. Andrews gave a full account of the Federal project for the pressure gasification of non-coking coals for the combined purpose of town's gas ' and the ... of town's gas ' and the production of synthetic liquid fuel. Work on the gasification of brown coal in. Victoria was commenced in 1931 by the technical staff of ...

1955-06-11T23:59:59.000Z

474

Religious Instruction in Schools  

Science Journals Connector (OSTI)

... avail. Choose the teachers carefully, train them adequately, and then trust them. The liberty of the well-prepared teacher is the essential condition. The pamphlet is not a ... been paramount in its production. It might be added in the same breath that the liberty of the teacher is the only way to secure the true interests of the children ...

1945-11-24T23:59:59.000Z

475

Research in the Universities  

Science Journals Connector (OSTI)

... to the Department of Scientific and Industrial Research in the field of nuclear and high-energy physicsor with the budget of CERN in which we have only a minority vote ? ... due largely to the mere accident that many of our industries grew up outside the ambit of scientific and technological studies, and should we not see whether ways cannot now ...

VISCOUNT HAILSHAM

1961-12-02T23:59:59.000Z

476

CERTAIN ALLUREMENTS IN PHYSICS  

Science Journals Connector (OSTI)

...o tile extent that it a'ords suetl.aa xeelleut patrtial explanation of phenomena and s Rue--esS.ful in the pie(iions of propet the of uexx eomidpounds, it m11u>1t ha:li,ve a mnea-ariue o:i triatl. Bllt in some respects it is misleaChng...

G. W. Stewart

1923-01-05T23:59:59.000Z

477

High Performance Computing in  

E-Print Network [OSTI]

High Performance Computing in Bioinformatics Thomas Ludwig (t.ludwig@computer.org) Ruprecht PART I: High Performance Computing Thomas Ludwig PART II: HPC Computing in Bioinformatics Alexandros #12;© Thomas Ludwig, Alexandros Stamatakis, GCB'04 3 PART I High Performance Computing Introduction

Stamatakis, Alexandros

478

Polyhydroxyalkanoate synthesis in plants  

DOE Patents [OSTI]

Novel transgenic plants and plant cells are capable of biosynthesis of polyhydroxyalkanoate (PHA). Heterologous enzymes involved in PHA biosynthesis, particularly PHA polymerase, are targeted to the peroxisome of a transgenic plant. Transgenic plant materials that biosynthesize short chain length monomer PHAs in the absence of heterologous .beta.-ketothiolase and acetoacetyl-CoA reductase are also disclosed.

Srienc, Friedrich (Lake Elmo, MN); Somers, David A. (Roseville, MN); Hahn, J. J. (New Brighton, MN); Eschenlauer, Arthur C. (Circle Pines, MN)

2000-01-01T23:59:59.000Z

479

Break In: Hacking  

Science Journals Connector (OSTI)

Open on a shot of an empty alley behind a CompUSA computer store. A girl in a hoody and a beefy guy roar up on a motorcycle. They stop next to an overflowing Dumpster and the camera zooms in on the action. The gi...

John Biggs

2004-01-01T23:59:59.000Z

480

International Programs in Agriculture  

E-Print Network [OSTI]

International Programs in Agriculture MessagefromtheDirector­ Staying Ahead of Globalization and more prosperous place for all. Fortunately, Purdue International Programs in Agriculture (IPIA) has natural disasters caution us to remember the power of nature. The United Nations Food and Agriculture

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


481

Photon Physics in ALICE  

E-Print Network [OSTI]

We give an overview of photon physics which will be studied by the ALICE experiment in proton-proton and heavy ion collisions at LHC. We compare properties of ALICE photon detectors and estimate their ability to measure neutral meson and direct photon spectra as well as gamma-hadron and gamma-jet correlations in pp and Pb+Pb collisions.

D. Peressounko; Y. Kharlov; for the ALICE collaboration

2009-07-16T23:59:59.000Z

482

in Condensed Matter Physics  

E-Print Network [OSTI]

Master in Condensed Matter Physics ­ Master académique #12;2 #12;3 Students at the University. Condensed matter physics is about explaining and predicting the relationship between the atomic, and broad education in the field of condensed matter physics · introduce you to current research topics

van der Torre, Leon

483

study programs in mathematics  

E-Print Network [OSTI]

study programs in m mathematics 1_ matematika 2008.qxp 16.7.2008 16:41 Page 1 #12;1_ matematika 2008.qxp 16.7.2008 16:41 Page 2 #12;3 CONTENTS 5 Introduction 7 Mathematics at the University of Ljubljana 9 Department of Mathematics information page Academic study program in Mathematics Academic study

?umer, Slobodan

484

Head in the clouds  

Science Journals Connector (OSTI)

......2009TheBritishComputerSociety computing in finance houses, chemical companies, and anywhere else...which the customer has produced in-house and wants to try on new architectures...processors for better performance and energy efficiency.' SiCortex, an HPC vendor, has even......

Hannah Dee

2009-05-01T23:59:59.000Z

485

Screening in multilayer graphene  

Science Journals Connector (OSTI)

In this paper, we study the static polarization in ABC-stacked multilayer graphene. Since the density of states diverges for these systems if the number of layers exceeds three, screening effects are expected to be important. In the random phase approximation, screening can be included through the polarization. We derive an analytical integral expression for the polarization in both the full-band model and an effective two-band model. Numerical evaluation of these integrals is very time consuming in the full-band model. Hence, for ABC-stacked trilayer graphene, we use the two-band model to calculate the low momentum part of the polarization. The results for the two-band model are universal, i.e., independent of doping. The high momentum part is linear and is determined by calculating two points, such that we can determine the slope. For ABC stacked trilayer graphene, the slope is given by three times the monolayer value. We compare our results to previous ones in the literature and discuss the similarities and discrepancies. Our results can be used to include screening in ABC-stacked multilayer systems in a way that all the characteristics of the polarization function are included. The numerical results for the polarization of trilayer graphene are used to sketch the screened potential.

Ralph van Gelderen; Richard Olsen; C. Morais Smith

2013-09-09T23:59:59.000Z

486

POSTERS IN THE PACIFIC  

Science Journals Connector (OSTI)

POSTERS IN THE PACIFIC ... PACIFICHEM NEWS: Student poster competition attracted 2,000 hopeful chemistry students to Hawaii ... NERVOUS ENERGY filled the cavernous Kamehameha exhibit hall in the Honolulu Convention Center on Dec. 16 as the 237 finalists for the Pacifichem 2010 student poster competition set up their posters and awaited the judges. ...

STEVE RITTER

2011-01-10T23:59:59.000Z

487

Research Frontiers in Environmental  

E-Print Network [OSTI]

September 15, 1998 Editors: Bruce E. Logan Charles R. O'Melia Bruce E. Rittmann A Report of a Workshop On January 14-16, 1998, a meeting was held at the Asilomar Conference Center in Monterey, California Chairs, Bruce Logan and Charles O'Melia, based on either membership in the National Academy

488

Science in the News  

Science Journals Connector (OSTI)

...name of the equipment, a short...Lists of equipment for each...stocks of equipment. The book...vegetable oil in that country...experi-ence in the field. Fellows...extraordinary costs. The deadline...Products Operation. A limited...Jer-sey Production Research...new medical index to be called...development of gas-liquid...

1959-11-13T23:59:59.000Z

489

Atomic Power in Japan  

Science Journals Connector (OSTI)

NUCLEAR ENERGY will provide most of the power requirements in Japan by the end of this century. So predicts Charles H. Weaver, vice president in charge of atomic power activities for Westinghouse Electric.Addressing the Conference on Peaceful Uses of ...

1957-05-27T23:59:59.000Z

490

CLOCKS IN ALGAE  

Science Journals Connector (OSTI)

CLOCKS IN ALGAE ... As major contributors to global oxygen levels and producers of fatty acids, carotenoid, sterols and phycocolloids, algae have significant ecological and commercial roles. ... The genetic and molecular approaches that identified clock components in other taxa were not as widely applied to algae. ...

Zeenat B. Noordally; Andrew Millar

2014-11-07T23:59:59.000Z

491

BOTULISM IN CATTLE  

Science Journals Connector (OSTI)

...e., in horses and mules (Graham, Brueckner and Pontius (1917)). In these animals...injection of botulinus antitoxin (Graham and Brueckner (1919)). The relation of B. botulinus...Bact., 4,541. GRAHAm, ROBERT, BRUECKNER, A. L., AND PONTIUs, R. L. 1917...

Robert Graham; Herman R. Schwarze

1921-01-01T23:59:59.000Z

492

MATLAB Einfuhrung Einfuhrung in  

E-Print Network [OSTI]

MATLAB Einf¨uhrung Einf¨uhrung in MATLAB FB Physik, Mathematik & Informatik · Johannes Gutenberg;Was ist MATLAB? MATLAB (Matrix Laboratory) ist eine interaktive Interpreter-Sprache, die einen einfa Gleichungssysteme oder ¨ahnlichem ­ bietet. Wie startet man MATLAB? In den Rechner-Pools im 3., 4. oder 5. Stock des

Hanke-Bourgeois, Martin

493

Offshore Sulfur Comes In  

Science Journals Connector (OSTI)

Offshore Sulfur Comes In ... "The deposit is a major new source of sulfur," say Hines H. Baker, president of Humble Oil, and Langbourne M. Williams, president of Freeport Sulphur. ... Humble's deposit, known as Grand Isle (Block 18), was discovered in the course of offshore oil exploration and it ranks among the most important sulfur discoveries of recent years. ...

1956-10-01T23:59:59.000Z

494

CHROMOSOME NUMBERS IN MAMMALS  

Science Journals Connector (OSTI)

...variables for which the double inte-gral does not exist: R. L. JEFFERY. On the number of elements in a group which have a power in...society will meet at Columbia University, MA ay 2, 1925. W. BENJAMIN FITE Acting Secretary 424 SCIENCE

Theophilus S. Painter

1925-04-17T23:59:59.000Z

495

PROBLEMS IN AURORAL MORPHOLOGY  

Science Journals Connector (OSTI)

...System of auroral arcs. A very important and...charges will produce electric currents in the upper...is present during the arc phase of the auroral...gases in a low-pressure discharge tube using protons and...phase of breakup of the arc system may indicate a...

C. T. Elvey

1957-01-01T23:59:59.000Z

496

GHG Considerations in Integrated  

E-Print Network [OSTI]

6/5/2013 1 GHG Considerations in Integrated Resource Planning NWPCC Greenhouse Gas and Regional Power System Symposium © 2012 Portland General Electric. All rights reserved. June 4, 2013 GHG in the IRP: OPUC Guidelines OPUC Guidelines for GHG: A four-part harmonyOPUC Guidelines for GHG: A four part

497

Photosensory behavior in procaryotes.  

Science Journals Connector (OSTI)

...photosynthetic organisms as an energy source, and growth and...a high sensitivity to solar UV radiation was found...Information and energy transduction in biological...Seasonal variation of solar UV-radiation at a high...Information and energy transduction in biological...

D P Hder

1987-03-01T23:59:59.000Z

498

Practical Experiments in Statistics  

Science Journals Connector (OSTI)

An simple and inexpensive experiment in radioactive decay that can be applied to any field that requires a knowledge of statistics; the primary goal is to familiarize students with probability distributions. ... A Didactic Experience of Statistical Analysis for the Determination of Glycine in a Nonaqueous Medium Using ANOVA and a Computer Program ...

Craig A. Stone; Lorin D. Mumaw

1995-01-01T23:59:59.000Z

499

Desalination Research in Britain  

Science Journals Connector (OSTI)

... Sir Edward Boyle stated that the Department of Scientific and Industrial Research had constituted a desalination research committee to advise how it could most usefully assist British industry in the general ... to advise how it could most usefully assist British industry in the general field of desalination research and development. The committee, Of which Dr. L. Grunberg was chairman, ...

1964-06-06T23:59:59.000Z

500

Computational intelligence in bioinformatics  

Science Journals Connector (OSTI)

Computational intelligence poses several possibilities in Bioinformatics, particularly by generating low-cost, low-precision, good solutions. Rough sets promise to open up an important dimension in this direction. The present article surveys the role ... Keywords: artificial neural networks, biological data mining, gene expression, genetic algorithms, proteins, rough sets, soft computing

Sushmita Mitra

2005-01-01T23:59:59.000Z