2,174 research outputs found
Origins of the ALMA Project in the scientific visions of the North American, European, and Japanese astronomical communities
ALMA is a worldwide project, the synthesis of early visions of astronomers in
its three partner communities, Europe, North America, and Japan. The evolution
of these concepts and their eventual merger into ALMA are discussed, setting
the background for the papers which follow on the scientific requirements and
expected performance of ALMA for extra-galactic, galactic, and solar system
research.Comment: 4 pages, including 1 figure; to appear in ESA SP-577, Proceedings of
the conference "Dusty and Molecular Universe - A prelude to HERSCHEL AND
ALMA", October 25-27, 2004, Pari
Total control over ultracold interactions via electric and magnetic fields
The scattering length is commonly used to characterize the strength of
ultracold atomic interactions, since it is the leading parameter in the
low-energy expansion of the scattering phase shift. Its value can be modified
via a magnetic field, by using a Feshbach resonance. However, the effective
range term, which is the second parameter in the phase shift expansion,
determines the width of the resonance and gives rise to important properties of
ultracold gases. Independent control over this parameter is not possible by
using a magnetic field only. We demonstrate that a combination of magnetic and
electric fields can be used to get independent control over both parameters,
which leads to full control over elastic ultracold interactions.Comment: 4 pages, 3 figure
Continuum Observations at 350 Microns of High-Redshift Molecular Emission Line Galaxies
We report observations of 15 high redshift (z = 1-5) galaxies at 350 microns
using the Caltech Submillimeter Observatory and SHARC-II array detector.
Emission was detected from eight galaxies, for which far-infrared luminosities,
star formation rates, total dust masses, and minimum source size estimates are
derived. These galaxies have star formation rates and star formation
efficiencies comparable to other high redshift molecular emission line
galaxies. The results are used to test the idea that star formation in these
galaxies occurs in a large number of basic units, the units being similar to
star-forming clumps in the Milky Way. The luminosity of these extreme galaxies
can be reproduced in a simple model with (0.9-30) *10^6 dense clumps, each with
a luminosity of 5 *10^5 Lsun, the mean value for such clumps in the Milky Way.
Radiative transfer models of such clumps can provide reasonable matches to the
overall SEDs of the galaxies. They indicate that the individual clumps are
quite opaque in the far-infrared. Luminosity to mass ratios vary over two
orders of magnitude, correlating strongly with the dust temperature derived
from simple fits to the SED. The gas masses derived from the dust modeling are
in remarkable agreement with those from CO luminosities, suggesting that the
assumptions going into both calculations are reasonable.Comment: 17 pages, 8 figures. Accepted by Ap
The Impact of Company Grade Officer Self-Sacrificial Behavior on Subordinate Assessments of Leader Charisma
Newly commissioned officers in the U.S. Army are taught to lead their soldiers from the front and to voluntarily make personal sacrifices in the service of the nation. Although this facet of military culture is seen as critical to the integrity of the force, there are few research studies describing the impact of leader self-sacrifice in the U.S. Army. Research evolving from the transformational leadership literature indicates that civilian leaders who engage in self-sacrificial behavior are viewed as more charismatic than their counterparts and that this perception is particularly pronounced in crisis situations. The current study extended this research to a military population utilizing a quantitative experimental research design. Respondents were randomly assigned to written vignettes that manipulated leader self-sacrifice and the combat environment and then provided assessments of the company grade officer\u27s attributed charisma. Currently serving enlisted and commissioned officers in the California Army National Guard (n = 218) took part in the research, and ANOVA test results indicated that both self-sacrifice and the experience of combat significantly increase perceptions of a company grade officer\u27s attributed charisma. No significant interaction was found between leader self-sacrifice and combat. This study indicated that the self-sacrificial leadership model may have broad applicability across organizations and provides strong support for the Army\u27s emphasis on selfless service. This research can spur positive social change by fostering a more aspirational form of leadership within the Army that builds the psychological resilience of soldiers and results in stronger teams
High Redshift HCN Emission: Dense Star-Forming Molecular Gas in IRAS F10214+4724
Hydrogen cyanide emission in the J=1-0 transition has been detected at
redshift z=2.2858 in IRAS F10214+4724 using the Green Bank Telescope . This is
the second detection of HCN emission at high redshift. The large HCN line
luminosity in F10214 is similar to that in the Cloverleaf (z=2.6) and the
ultra-luminous infrared galaxies Mrk231 and Arp220. This is also true of the
ratio of HCN to CO luminosities. The ratio of far-infrared luminosity to HCN
luminosity, an indicator of the star formation rate per solar mass of dense
gas, follows the correlation found for normal spirals and infrared luminous
starburst galaxies. F10214 clearly contains a starburst that contributes,
together with its embedded quasar, to its overall infrared luminosity. A new
technique for removing spectral baselines in the search for weak, broad
emission lines is presented.Comment: 9 pages, 2 figures; accepted ApJ(Letters
Analyse des données de l\u27enquête "les publics de la Bn-r" (Bibliothèque numérique de Roubaix)
Analyse des données recueillies lors d\u27une enquête en ligne menée entre mai et juillet 2010 visant à identifier les publics et les usages de la Bn-r ( bibliothèque numérique de Roubaix)
American Prodigal: White Church, Black Church, and the Feast of Social Justice
Editor\u27s Note: Dr. Vanden Bout presented this paper at the Prodigal Love of God Conference, in celebration of the 400th anniversary of the Canons of Dort, April 2019, sponsored by Dordt University and co-sponsored by the Lilly Fellowship Program, as a regional conference
Коксозамещающие энергосберигающие угольные технологии доменной плавки
Представлена рецензия на работу в области доменного производства, выдвинутую на соискание Государственной премии Украины в области науки и техники
за 2007 год в развитие
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