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1

A relationship between galactic cosmic radiation and tree rings.  

PubMed

Here, we investigated the interannual variation in the growth rings formed by Sitka spruce (Picea sitchensis) trees in northern Britain (55 degrees N, 3 degrees W) over the period 1961-2005 in an attempt to disentangle the influence of atmospheric variables acting at different times of year. Annual growth rings, measured along the north radius of freshly cut (frozen) tree discs and climatological data recorded at an adjacent site were used in the study. Correlations were based on Pearson product-moment correlation coefficients between the annual growth anomaly and these climatic and atmospheric factors. Rather weak correlations between these variables and growth were found. However, there was a consistent and statistically significant relationship between growth of the trees and the flux density of galactic cosmic radiation. Moreover, there was an underlying periodicity in growth, with four minima since 1961, resembling the period cycle of galactic cosmic radiation. * We discuss the hypotheses that might explain this correlation: the tendency of galactic cosmic radiation to produce cloud condensation nuclei, which in turn increases the diffuse component of solar radiation, and thus increases the photosynthesis of the forest canopy. PMID:19754637

Dengel, Sigrid; Aeby, Dominik; Grace, John

2009-09-14

2

On Rings and Streams in the Galactic Anti-Center  

NASA Astrophysics Data System (ADS)

We confirm that there are at least three separate low-latitude overdensities of blue F turnoff stars near the Milky Way anti-center: the Monoceros Ring, the Anti-Center Stream (ACS), and the Eastern Banded Structure (EBS). There might also be a small number of normal thick disk stars at the same location. The ACS is a tilted component that extends to higher Galactic latitude at lower Galactic longitude, 10 kpc from the Sun toward the anti-center. It has a sharp cutoff on the high-latitude side. Distance, velocity, and proper motion measurements are consistent with previous orbit fits. The mean metallicity is [Fe/H] =-0.96 ± 0.03, which is lower than the thick disk and Monoceros Ring. The Monoceros Ring is a higher density substructure that is present at 15° < b < 22° at all longitudes probed in this survey. The structure likely continues toward lower latitudes. The distances are consistent with a constant distance from the Galactic center of 17.6 kpc. The mean line-of-sight velocity of the structure is consistent with a thick disk rotation. However, the velocity dispersion of these stars is ~15 km s-1 and the metallicity is [Fe/H] =-0.80 ± 0.01. Both of these quantities are lower than the canonical thick disk. We suggest that this ring structure is likely different from the thick disk, though its association with the disk cannot be definitively ruled out. The EBS is detected primarily photometrically, near (l, b) = (225°, 30°), at a distance of 10.9 kpc from the Sun.

Li, Jing; Newberg, Heidi Jo; Carlin, Jeffrey L.; Deng, Licai; Newby, Matthew; Willett, Benjamin A.; Xu, Yan; Luo, Zhiquan

2012-10-01

3

Activity of Galactic Nuclei and Ring-Like Structures in Normal Galaxies.  

National Technical Information Service (NTIS)

Formation mechanism of ring-like structures in normal galaxies is discussed. The above structures observed in normal galaxies are possibly formed by shock waves generated by recurrent activity of galactic nuclei. Specific features of ring-like structures ...

P. I. Fomin I. G. Kolesnik S. A. Silich

1979-01-01

4

A 100 pc Elliptical and Twisted Ring of Cold and Dense Molecular Clouds Revealed by Herschel Around the Galactic Center  

NASA Astrophysics Data System (ADS)

Thermal images of cold dust in the Central Molecular Zone of the Milky Way, obtained with the far-infrared cameras on board the Herschel satellite, reveal a ~3 × 107 M sun ring of dense and cold clouds orbiting the Galactic center. Using a simple toy model, an elliptical shape having semi-major axes of 100 and 60 pc is deduced. The major axis of this 100 pc ring is inclined by about 40° with respect to the plane of the sky and is oriented perpendicular to the major axes of the Galactic Bar. The 100 pc ring appears to trace the system of stable x 2 orbits predicted for the barred Galactic potential. Sgr Asstarf is displaced with respect to the geometrical center of symmetry of the ring. The ring is twisted and its morphology suggests a flattening ratio of 2 for the Galactic potential, which is in good agreement with the bulge flattening ratio derived from the 2MASS data.

Molinari, S.; Bally, J.; Noriega-Crespo, A.; Compiègne, M.; Bernard, J. P.; Paradis, D.; Martin, P.; Testi, L.; Barlow, M.; Moore, T.; Plume, R.; Swinyard, B.; Zavagno, A.; Calzoletti, L.; Di Giorgio, A. M.; Elia, D.; Faustini, F.; Natoli, P.; Pestalozzi, M.; Pezzuto, S.; Piacentini, F.; Polenta, G.; Polychroni, D.; Schisano, E.; Traficante, A.; Veneziani, M.; Battersby, C.; Burton, M.; Carey, S.; Fukui, Y.; Li, J. Z.; Lord, S. D.; Morgan, L.; Motte, F.; Schuller, F.; Stringfellow, G. S.; Tan, J. C.; Thompson, M. A.; Ward-Thompson, D.; White, G.; Umana, G.

2011-07-01

5

On Rings and Streams in the Galactic Anticenter  

NASA Astrophysics Data System (ADS)

A number of low-latitude stellar overdensities have been found near the Milky Way anticenter at a Galactocentric distance of 18-20 kpc. Our study combines SDSS photometry and spectroscopy from 34 regions containing SEGUE plates at latitudes b<40 degrees over the entire 145Galactic center. This feature has thick disk-like mean velocity, but dispersion of 16 km/s and mean [Fe/H]=-0.8. We show that both the dispersion and metallicity of this feature are lower than the thick disk ([Fe/H]=-0.5) at slightly smaller (14 kpc) distances. There appears to be a discontinuity in stellar density, scale height and stellar population between lower latitude substructure properties and the thick disk, though an association with the Galactic disks cannot be ruled out. The two higher latitude substructures (identified as the ACS and EBS by Grillmair 2006) are most likely tidal streams; they cannot be static disk structures. This project is funded by NSF grant AST-09-37523 and AST-10-09670, and NSFC grants 10973015 and 11061120454.

Carlin, Jeffrey L.; Li, J.; Newberg, H. J.; Deng, L.; Newby, M.; Xu, Y.

2012-01-01

6

Si II mapping of the neutral gas ring in the Galactic center - evidence for dust destruction  

SciTech Connect

The distribution of Si II emission in the Galactic center has been measured and found to extend beyond 4 pc from the center. The observed forbidden Si II 34.8 micron line, which is thermally excited by H I and H2 collisions, originates from the photodissociation region formed in the neutral gas ring surrounding the ionized core. Two peaks in the Si II emission are found, one lying 20 arcsec northeast of Sgr A-asterisk along the Galactic plane and the other located about 80 arcsec north of Sgr A-asterisk. The latter peak is located beyond the northern arm seen in the ionized gas. The ratio of Si II to dust mass density varies in the ring, indicating changes in the gas-to-dust ratio. The mass density of Si II and dust are anticorrelated, indicating that Si II tracks the destruction of dust. 21 refs.

Herter, T.; Gull, G.E.; Megeath, S.T.; Rowlands, N.; Houck, J.R. (Cornell Univ., Ithaca, NY (USA))

1989-08-01

7

Galactic ring nebulae associated with Wolf-Rayet stars. IV. The ring nebula S308 and its interstellar environment  

SciTech Connect

We have obtained narrwo-band filter photographs, (O III) lambda5007 Fabry-Perot line profiles and 21 cm maps of the cicinity of the Sharpless H II region S308 and adjacent nebulae. S308 is a ring nebula surrounding the WN5 star HD 50896. An expansion velocity of 60 km s/sup -1/ and an age of 7 x 10/sup 4/ years are derived for S308. The total kinetic energy and thermal energy in the shell of S308 can account for only 5% of the total stellar wind energy input. The H II regions S303 and S304 exterior to S308 are also excited by the star HD 50896, showing that S308 is optically thin to UV photons.

Chu, Y.; Gull, T.R.; Treffers, R.R.; Kwitter, K.B.; Troland, T.H.

1982-03-15

8

A Galactic ring of minimum stellar density near the solar orbit radius  

NASA Astrophysics Data System (ADS)

We analyse the secular effects of a long-lived Galactic spiral structure on the stellar orbits with mean radii close to the corotation resonance. By test-particle simulations and different spiral potential models with parameters constrained on observations, we verified the formation of a minimum with amplitude ˜30-40 per cent of the background disc stellar density at corotation. Such a minimum is formed by the secular angular momentum transfer between stars and the spiral density wave on both sides of corotation. We demonstrate that the secular loss (gain) of angular momentum and decrease (increase) of mean orbital radius of stars just inside (outside) corotation can counterbalance the opposite trend of exchange of angular momentum shown by stars orbiting the librational points L4/5 at the corotation circle. Such secular processes actually allow steady spiral waves to promote radial migration across corotation. We propose some pieces of observational evidence for the minimum stellar density in the Galactic disc, such as its direct relation to the minimum in the observed rotation curve of the Galaxy at the radius r ˜ 9 kpc (for R0 = 7.5 kpc), as well as its association with a minimum in the distribution of Galactic radii of a sample of open clusters older than 1 Gyr. The closeness of the solar orbit radius to the corotation resonance implies that the solar orbit lies inside a ring of minimum surface density (stellar + gas). This also implies a correction to larger values for the estimated total mass of the Galactic disc, and consequently, a greater contribution of the disc component to the inner rotation curve of the Galaxy.

Barros, D. A.; Lépine, J. R. D.; Junqueira, T. C.

2013-09-01

9

A Galactic ring of minimum stellar density near the solar orbit radius  

NASA Astrophysics Data System (ADS)

We analyse the secular effects of a long-lived Galactic spiral structure on the stellar orbits with mean radii close to the corotation resonance. By test-particle simulations and different spiral potential models with parameters constrained on observations, we verified the formation of a minimum with amplitude ˜30-40 per cent of the background disc stellar density at corotation. Such a minimum is formed by the secular angular momentum transfer between stars and the spiral density wave on both sides of corotation. We demonstrate that the secular loss (gain) of angular momentum and decrease (increase) of mean orbital radius of stars just inside (outside) corotation can counterbalance the opposite trend of exchange of angular momentum shown by stars orbiting the librational points L4/5 at the corotation circle. Such secular processes actually allow steady spiral waves to promote radial migration across corotation. We propose some pieces of observational evidence for the minimum stellar density in the Galactic disc, such as its direct relation to the minimum in the observed rotation curve of the Galaxy at the radius r ˜ 9 kpc (for R0 = 7.5 kpc), as well as its association with a minimum in the distribution of Galactic radii of a sample of open clusters older than 1 Gyr. The closeness of the solar orbit radius to the corotation resonance implies that the solar orbit lies inside a ring of minimum surface density (stellar + gas). This also implies a correction to larger values for the estimated total mass of the Galactic disc, and consequently, a greater contribution of the disc component to the inner rotation curve of the Galaxy.

Barros, D. A.; Lépine, J. R. D.; Junqueira, T. C.

2013-11-01

10

A 100 pc ELLIPTICAL AND TWISTED RING OF COLD AND DENSE MOLECULAR CLOUDS REVEALED BY HERSCHEL AROUND THE GALACTIC CENTER  

SciTech Connect

Thermal images of cold dust in the Central Molecular Zone of the Milky Way, obtained with the far-infrared cameras on board the Herschel satellite, reveal a {approx}3 x 10{sup 7} M{sub sun} ring of dense and cold clouds orbiting the Galactic center. Using a simple toy model, an elliptical shape having semi-major axes of 100 and 60 pc is deduced. The major axis of this 100 pc ring is inclined by about 40{sup 0} with respect to the plane of the sky and is oriented perpendicular to the major axes of the Galactic Bar. The 100 pc ring appears to trace the system of stable x{sub 2} orbits predicted for the barred Galactic potential. Sgr A* is displaced with respect to the geometrical center of symmetry of the ring. The ring is twisted and its morphology suggests a flattening ratio of 2 for the Galactic potential, which is in good agreement with the bulge flattening ratio derived from the 2MASS data.

Molinari, S.; Di Giorgio, A. M.; Elia, D.; Pestalozzi, M.; Pezzuto, S. [INAF-Istituto Fisica Spazio Interplanetario, Via Fosso del Cavaliere 100, I-00133 Roma (Italy); Bally, J. [Center for Astrophysics and Space Astronomy, University of Colorado, Boulder, CO 80309 (United States); Noriega-Crespo, A.; Compiegne, M. [Spitzer Science Center, California Institute of Technology, 1200 E. California Bl., Pasadena, CA 91125 (United States); Bernard, J. P.; Paradis, D. [CNRS, IRAP, 9 Av. colonel Roche, BP 44346, F-31028 Toulouse cedex 4 (France); Martin, P. [Department of Astronomy and Astrophysics, University of Toronto (Canada); Testi, L. [European Southern Observatory, Karl Schwarzschild Str. 2, 85748 Garching (Germany); Barlow, M.; Swinyard, B. [Department of Physics and Astronomy, University College London, London (United Kingdom); Moore, T. [Astrophysics Research Institute, Liverpool John Moores University (United Kingdom); Plume, R. [Department of Physics and Astronomy, University of Calgary (Canada); Zavagno, A. [LAM, Universite de Provence, Marseille (France); Calzoletti, L.; Faustini, F.; Natoli, P. [Agenzia Spaziale Italiana (ASI) Science Data Center, I-00044 Frascati, Roma (Italy)

2011-07-10

11

MOLECULAR CLOUDS AND CLUMPS IN THE BOSTON UNIVERSITY-FIVE COLLEGE RADIO ASTRONOMY OBSERVATORY GALACTIC RING SURVEY  

SciTech Connect

The Boston University-Five College Radio Astronomy Observatory (BU-FCRAO) Galactic Ring Survey (GRS) of {sup 13}CO J = 1 {yields} 0 emission covers Galactic longitudes 18{sup 0} < l < 55.{sup 0}7 and Galactic latitudes |b| {<=} 1{sup 0}. Using the SEQUOIA array on the FCRAO 14 m telescope, the GRS fully sampled the {sup 13}CO Galactic emission (46'' angular resolution on a 22'' grid) and achieved a spectral resolution of 0.21 km s{sup -1}. Because the GRS uses {sup 13}CO, an optically thin tracer, rather than {sup 12}CO, an optically thick tracer, the GRS allows a much better determination of column density and also a cleaner separation of velocity components along a line of sight. With this homogeneous, fully sampled survey of {sup 13}CO emission, we have identified 829 molecular clouds and 6124 clumps throughout the inner Galaxy using the CLUMPFIND algorithm. Here we present details of the catalog and a preliminary analysis of the properties of the molecular clouds and their clumps. Moreover, we compare clouds inside and outside of the 5 kpc ring and find that clouds within the ring typically have warmer temperatures, higher column densities, larger areas, and more clumps compared with clouds located outside the ring. This is expected if these clouds are actively forming stars. This catalog provides a useful tool for the study of molecular clouds and their embedded young stellar objects.

Rathborne, J. M.; Johnson, A. M.; Jackson, J. M.; Shah, R. Y. [Institute for Astrophysical Research, Boston University, Boston, MA 02215 (United States); Simon, R. [I.Physikalisches Institut, Universitaet zu Koeln, 50937 Koeln (Germany)], E-mail: rathborn@bu.edu, E-mail: alexj@bu.edu, E-mail: jackson@bu.edu, E-mail: ronak@bu.edu, E-mail: simonr@ph1.uni-koeln.de

2009-05-15

12

A 100 pc Elliptical and Twisted Ring of Cold and Dense Molecular Clouds Revealed by Herschel Around the Galactic Center  

Microsoft Academic Search

Thermal images of cold dust in the Central Molecular Zone of the Milky Way, obtained with the far-infrared cameras on board the Herschel satellite, reveal a ~3 × 107 M sun ring of dense and cold clouds orbiting the Galactic center. Using a simple toy model, an elliptical shape having semi-major axes of 100 and 60 pc is deduced. The

S. Molinari; J. Bally; A. Noriega-Crespo; M. Compiègne; J. P. Bernard; D. Paradis; P. Martin; L. Testi; M. Barlow; T. Moore; R. Plume; B. Swinyard; A. Zavagno; L. Calzoletti; A. M. Di Giorgio; D. Elia; F. Faustini; P. Natoli; M. Pestalozzi; S. Pezzuto; F. Piacentini; G. Polenta; D. Polychroni; E. Schisano; A. Traficante; M. Veneziani; C. Battersby; M. Burton; S. Carey; Y. Fukui; J. Z. Li; S. D. Lord; L. Morgan; F. Motte; F. Schuller; G. S. Stringfellow; J. C. Tan; M. A. Thompson; D. Ward-Thompson; G. White; G. Umana

2011-01-01

13

SUBMILLIMETER AND MOLECULAR VIEWS OF THREE GALACTIC RING-LIKE H II REGIONS  

SciTech Connect

We use SCUBA 850 {mu}m and CO observations to analyze the surroundings of three Galactic ring-like H II regions, KR 7, KR 81, and KR 120 (Sh 2-124, Sh 2-165, and Sh 2-187), with the aim of finding sites of triggered star formation. We find one prominent submillimeter (sub-mm) source for each region, located at the interface between the H II region and its neutral surroundings. Using Two Micron All Sky Survey photometry, we find that the prominent sub-mm source for KR 120 probably contains an embedded cluster of young stellar objects (YSOs), making it a likely site for triggered star formation. The KR 7 sub-mm source could possibly contain embedded YSOs, while the KR 81 sub-mm source likely does not. The mass column densities for these dominant sub-mm sources fall in the {approx}0.1-0.6 g cm{sup -2} range. The mass of the cold, dense material (clumps) seen as the three dominant sub-mm sources falls around {approx}100 M{sub sun}. We use the SCUBA Legacy catalog to characterize the populations of sub-mm sources around the H II regions, and compare them to the sources found around a previously studied similar ring-like H II region (KR 140) and near a massive star-forming region (W3). Finally, we estimate the IR luminosities of the prominent newly detected sub-mm sources and find that they are correlated with the clump mass, consistent with a previously known luminosity-mass relationship which this study shows to be valid over four orders of magnitude in mass.

Arvidsson, K. [Astronomy Department, Adler Planetarium, 1300 South Lake Shore Drive, Chicago, IL 60605 (United States); Kerton, C. R., E-mail: karvidsson@adlerplanetarium.org, E-mail: kerton@iastate.edu [Department of Physics and Astronomy, Iowa State University, Ames, IA 50011 (United States)

2011-05-15

14

Galactic ring nebulae associated with Wolf-Rayet stars. VI - NGC 3199, anon /MR 26/, RCW 58, and RCW 104  

NASA Astrophysics Data System (ADS)

Narrow-band interference filter photographs and high resolution Fabry-Perot spectra have been obtained for four galactic ring nebulae associated with Wolf-Rayet stars - NGC 3199, anon (MR 26), RCW 58, and RCW 104. All of these four nebulae show interaction between the stellar wind and the ambient interstellar medium. NGC 3199, anon (MR 26), and RCW 104 are classified as W-type nebulae. RCW 58, having a prominent ring of stellar ejecta, is classified as an E-type nebula. For most W-type nebulae, the kinetic energy in the shell is only about 1 percent of the total mechanical energy input from the stellar wind, while the ratio of the shell momentum to the total momentum injected by the stellar wind is about 0.5 and apparently increases with the nebular age.

Chu, Y.-H.

1982-03-01

15

Mixed exterior Laplace's problem  

NASA Astrophysics Data System (ADS)

In [C. Amrouche, V. Girault, J. Giroire, Dirichlet and Neumann exterior problems for the n-dimensional Laplace operator. An approach in weighted Sobolev spaces, J. Math. Pures Appl. 76 (1997) 55-81], authors study Dirichlet and Neumann problems for the Laplace operator in exterior domains of . This paper extends this study to the resolution of a mixed exterior Laplace's problem. Here, we give existence, unicity and regularity results in Lp's theory with 1

Amrouche, Chérif; Bonzom, Florian

2008-02-01

16

THE TURBULENCE SPECTRUM OF MOLECULAR CLOUDS IN THE GALACTIC RING SURVEY: A DENSITY-DEPENDENT PRINCIPAL COMPONENT ANALYSIS CALIBRATION  

SciTech Connect

Turbulence plays a major role in the formation and evolution of molecular clouds. Observationally, turbulent velocities are convolved with the density of an observed region. To correct for this convolution, we investigate the relation between the turbulence spectrum of model clouds, and the statistics of their synthetic observations obtained from principal component analysis (PCA). We apply PCA to spectral maps generated from simulated density and velocity fields, obtained from hydrodynamic simulations of supersonic turbulence, and from fractional Brownian motion (fBm) fields with varying velocity, density spectra, and density dispersion. We examine the dependence of the slope of the PCA pseudo-structure function, {alpha}{sub PCA}, on intermittency, on the turbulence velocity ({beta}{sub v}) and density ({beta}{sub n}) spectral indexes, and on density dispersion. We find that PCA is insensitive to {beta}{sub n} and to the log-density dispersion {sigma}{sub s}, provided {sigma}{sub s} {<=} 2. For {sigma}{sub s} > 2, {alpha}{sub PCA} increases with {sigma}{sub s} due to the intermittent sampling of the velocity field by the density field. The PCA calibration also depends on intermittency. We derive a PCA calibration based on fBm structures with {sigma}{sub s} {<=} 2 and apply it to 367 {sup 13}CO spectral maps of molecular clouds in the Galactic Ring Survey. The average slope of the PCA structure function, ({alpha}{sub PCA}) = 0.62 {+-} 0.2, is consistent with the hydrodynamic simulations and leads to a turbulence velocity exponent of ({beta}{sub v}) = 2.06 {+-} 0.6 for a non-intermittent, low density dispersion flow. Accounting for intermittency and density dispersion, the coincidence between the PCA slope of the GRS clouds and the hydrodynamic simulations suggests {beta}{sub v} {approx_equal} 1.9, consistent with both Burgers and compressible intermittent turbulence.

Roman-Duval, Julia; Jackson, James [Institute for Astrophysical Research at Boston University, 725 Commonwealth Avenue, Boston, MA 02215 (United States); Federrath, Christoph; Klessen, Ralf S. [Zentrum fuer Astronomie der Universitaet Heidelberg, Institut fuer Theoretische Astrophysik, Albert-Ueberle-Str. 2, D-69120 Heidelberg (Germany); Brunt, Christopher [School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL (United Kingdom); Heyer, Mark, E-mail: jduval@bu.edu, E-mail: jackson@bu.edu, E-mail: duval@stsci.edu, E-mail: chfeder@uni-heidelberg.de, E-mail: klessen@uni-heidelberg.de, E-mail: heyer@astro.umass.edu [Department of Astronomy, University of Massachusetts, Amherst, MA 01003-9305 (United States)

2011-10-20

17

Discrete Exterior Calculus  

Microsoft Academic Search

We present a theory and applications of discrete exterior calculus on\\u000asimplicial complexes of arbitrary finite dimension. This can be thought of as\\u000acalculus on a discrete space. Our theory includes not only discrete\\u000adifferential forms but also discrete vector fields and the operators acting on\\u000athese objects. This allows us to address the various interactions between forms\\u000aand vector

Anil N. Hirani; Melvin Leok; Jerrold E. Marsden

2005-01-01

18

Rings  

SciTech Connect

The essence of vortex physics is that at certain low-energy scales elementary excitations of a point particle theory can behave like strings rather than particles. Vortices are the resulting string-like solutions; their thickness sets the distance scale beyond which physics is string-like rather than particle-like. String degrees of freedom are massless in the sense that excitations on a string can have an arbitrarily low frequency. Non-string degrees of freedom correspond to massive particles and are absent from the low energy spectrum. This article considers only field theories with vortices at low energies. The possible existence of a class of solitons in these vortex theories will be discussed. They are vortex rings: they are localized and finite in energy, and able to carry the quantum numbers of point particles. Rings are thus particle-like solutions of a vortex theory, which is itself a limit of a point particle field theory.

Davis, R.L.

1989-01-01

19

Ring Arcs of Neptune.  

National Technical Information Service (NTIS)

After the corotation resonance with an exterior satellite proved inapplicable to the Neptune ring arc confinement, a search for other mechanisms settled on the possible influence of Neptune's magnetic field. The areas of greater optical depth around the r...

S. J. Peale

1991-01-01

20

Large Picture of the Galactic Center Studied by H_3^+: High Ionization Rate, Prevailing Warm and Diffuse Gas, and Non-Rotating Expanding Molecular Ring  

NASA Astrophysics Data System (ADS)

Following our initial studies of the diffuse interstellar medium in the Central Molecular Zone (CMZ) of the Galactic center (GC) toward two remarkable sightlines--one 140 pc to the West of Sgr A* near Sgr E, and the other 85 pc to the East of Sgr A* near Sgr B --we are in the process of using newly identified bright stars with smooth continua suitable for H_3^+ spectroscopy to both fill the gap between these sightlines and expand coverage to wider regions of the CMZ. So far we have identified 43 qualified stars, of which 24 have been at least partially observed (i.e., in at least one spectral setting). The high ionization rate (on the order of ?˜3×10^{-15} s^{-1}) and the existence of warm (T˜250 K) and diffuse (n?100 cm^{-3}) gas previously reported in the GC have also been observed in some of the new sightlines, indicating these conditions fill a large portion of the CMZ. The velocity profiles observed in the diffuse clouds, some of which show absorption extending ˜ 140 km s^{-1}, allow us to draw a velocity-longitude diagram. The high-velocity fronts of such a diagram reveal the existence of an expanding molecular ring (EMR) with radius of ˜ 140 pc and velocity of ˜ 140 km s^{-1}. This ring is similar to those previously reported but is qualitatively different in that it is not rotating, suggesting an expulsion rather than the gravitational potential as causing the EMR. Possible relations between our observations and other high energy events will be discussed. T. R. Geballe and T. Oka, ApJ, 709, L70 (2010). T. Oka, T. R. Geballe, M. Goto, T. Usuda, and B. J. McCall ApJ, 632, 882 (2005). N. Kaifu, T. Kato, and T. Iguchi, Nature, 238, 105 (1972). N. Z. Scoville, ApJ, 175, L127 (1972). Y. Sofue, PASJ, 47, 551 (1995).

Oka, Takeshi; Geballe, Thomas R.; Indriolo, Nick

2013-06-01

21

Differential complexes and exterior calculus  

Microsoft Academic Search

In this paper we present a new theory of calculus over $k$-dimensional domains in a smooth $n$-manifold, unifying the discrete, exterior, and continuum theories. The calculus begins at a single point and is extended to chains of finitely many points by linearity, or superposition. It converges to the smooth continuum with respect to a norm on the space of ``pointed

Jenny Harrison

2006-01-01

22

Evaluation of commercially available exterior digital VMDs  

SciTech Connect

This paper discusses the highlights from the full report, `Evaluation of Commercially Available Exterior Digital VMDs`, Charles E. Ringler, Chris E. Hoover, SAND94-2875, on the testing and evaluation of thirteen commercially available exterior digital video motion detection (VMD) systems. The systems were evaluated for use in a specific perimeter outdoor application. The full report focuses primarily on the testing parameters, each system`s advertised features, and the nuisance alarm and detection test results; this paper will summarize the nuisance alarm and detection test results and present some conclusions from the tests.

Ringler, C.E.; Hoover, C.E.

1996-06-01

23

Exterior truck noise measurements on turbocharger retrofit  

Microsoft Academic Search

Exterior noise level measurements were conducted on a typical in-service diesel engine heavy duty truck to determine the noise level reduction resulting from a turbocharger retrofit. The tests were conducted in accordance with procedures recommended by the Society of Automotive Engineers and the United States Department of Transportation. Overall noise level measurements and a narrow-band spectrum analysis indicate that a

Pisarski

1976-01-01

24

Evaluation of commercially available exterior digital VMDs  

SciTech Connect

This report discusses the testing and evaluation of thirteen commercially available exterior digital video motion detection (VMD) systems. The systems were evaluated for use in a specific outdoor application. The report focuses primarily on the testing parameters, each system`s advertised features, and the nuisance alarm and detection test results.

Ringler, C.E.; Hoover, C.E.

1995-06-01

25

46 CFR 154.1105 - Exterior water spray system: General.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Exterior water spray system: General. 154.1105... Firefighting § 154.1105 Exterior water spray system: General. Each liquefied...liquefied toxic gas vessel must have an exterior water spray system that meets §§...

2012-10-01

26

46 CFR 154.1105 - Exterior water spray system: General.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 2011-10-01 false Exterior water spray system: General. 154.1105... Firefighting § 154.1105 Exterior water spray system: General. Each liquefied...liquefied toxic gas vessel must have an exterior water spray system that meets §§...

2011-10-01

27

The exterior degree of symmetric group of order six  

NASA Astrophysics Data System (ADS)

The idea to compute the exterior degree of a finite group G started in 2011. The exterior degree of a group is the probability that two randomly selected elements x and y in the group such that x ? y = 1 and denoted as P?(G). However, in order to examine the exterior degree of a finite group, the nonabelian tensor square and some homological functors of the group must first be explored and determined. The homological functors that are used in determining the exterior degree of G are ?(G) and the exterior square of G. In this research, the nonabelian tensor square, ?(G) and the exterior square of symmetric group of order six are determined. Then, the exterior degree of symmetric group of order six is computed.

Nawi, Adnin Afifi binti; Mohd Ali, Nor Muhainiah; Sarmin, Nor Haniza

2013-04-01

28

Dark matter axions and caustic rings  

SciTech Connect

This report contains discussions on the following topics: the strong CP problem; dark matter axions; the cavity detector of galactic halo axions; and caustic rings in the density distribution of cold dark matter halos.

Sikivie, P.

1997-11-01

29

1. Historic American Buildings Survey EXTERIOR, LOOKING NORTHWEST Lanny Miyamoto, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. Historic American Buildings Survey EXTERIOR, LOOKING NORTHWEST Lanny Miyamoto, photographer - October 1958 - Franklin Street Presbyterian Church, Franklin & Cathedral Streets, Baltimore, Independent City, MD

30

1. EXTERIOR OF BUILDING 402, CIVIL ENGINEERING STORAGE, LOOKING SOUTH. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR OF BUILDING 402, CIVIL ENGINEERING STORAGE, LOOKING SOUTH. - Mill Valley Air Force Station, Civil Engineering Storage, East Ridgecrest Boulevard, Mount Tamalpais, Mill Valley, Marin County, CA

31

Marguerite Arnet Residence, exterior window detail, looking north. Adam ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Marguerite Arnet Residence, exterior window detail, looking north. - Adam & Bessie Arnet Homestead, Marguerite Arnet Residence, 560 feet northeast of Adam & Bessie Arnet Residence, Model, Las Animas County, CO

32

Marguerite Arnet Residence, exterior door detail, looking north. Adam ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Marguerite Arnet Residence, exterior door detail, looking north. - Adam & Bessie Arnet Homestead, Marguerite Arnet Residence, 560 feet northeast of Adam & Bessie Arnet Residence, Model, Las Animas County, CO

33

Collar nut and thrust ring  

DOEpatents

A collar nut comprises a hollow cylinder having fine interior threads at one end for threadably engaging a pump mechanical seal assembly and an inwardly depending flange at the other end. The flange has an enlarged portion with a groove for receiving an O-ring for sealing against the intrusion of pumpage from the exterior. The enlarged portion engages a thrust ring about the pump shaft for crushing a hard O-ring, such as a graphite O-ring. The hard O-ring seals the interior of the mechanical seal assembly and pump housing against the loss of lubricants or leakage of pumpage. The fine threads of the hollow cylinder provide the mechanical advantage for crushing the hard O-ring evenly and easily with a hand tool from the side of the collar nut rather than by tightening a plurality of bolts from the end and streamlines the exterior surface of the mechanical seal. The collar nut avoids the spatial requirements of bolt heads at the end of a seal and associated bolt head turbulence. 4 figs.

Lowery, G.B.

1989-04-20

34

Collar nut and thrust ring  

DOEpatents

A collar nut comprises a hollow cylinder having fine interior threads at one end for threadably engaging a pump mechanical seal assembly and an inwardly depending flange at the other end. The flange has an enlarged portion with a groove for receiving an O-ring for sealing against the intrusion of pumpage from the exterior. The enlarged portion engages a thrust ring about the pump shaft for crushing a hard O-ring, such as a graphite O-ring. The hard O-ring seals the interior of the mechanical seal assembly and pump housing against the loss of lubricants or leakage of pumpage. The fine threads of the hollow cylinder provide the mechanical advantage for crushing the hard O-ring evenly and easily with a hand tool from the side of the collar nut rather than by tightening a plurality of bolts from the end and streamlines the exterior surface of the mechanical seal. The collar nut avoids the spatial requirements of bolt heads at the end of a seal and associated bolt head turbulence.

Lowery, Guy B. (Aiken, SC)

1991-01-01

35

Galactic longitude dependent galactic model parameters  

Microsoft Academic Search

We present the Galactic model parameters for thin disc estimated by Sloan Digital Sky Survey (SDSS) data of 14 940 stars with apparent magnitudes 16Galactic quadrant. Star\\/galaxy separation was performed by using the SDSS photometric pipeline and the isodensity contours in the (g?r)0?(r?i)0 two colour diagram. The separation of thin disc

S. Bilir; S. Karaali; S. Ak; E. Yaz; E. Hamzaoglu

2006-01-01

36

24 CFR 3280.105 - Exit facilities; exterior doors.  

Code of Federal Regulations, 2013 CFR

...opening. (3) Each swinging exterior door other than screen or storm doors shall have a key-operated lock that has a deadlocking...operation from the inside. (4) All exterior doors, including storm and screen doors, opening outward shall be provided with...

2013-04-01

37

Plastics in automobile bumper systems and exterior panels  

SciTech Connect

This book contains the proceedings on plastics in automobile bumper systems and exterior panels. Topics covered include: High performance polyurea RIM for automotive body panels; AES/PC blends for exterior automotive application; Feasibility study on an injection molded long glass reinforced thermoplastic bumper beam; and design of ultra-high strength sheet steel beams.

Not Available

1990-01-01

38

Spray-ring mounting assembly  

SciTech Connect

This patent describes a thrust augmentation combustor for a gas turbine engine having a duct, an assembly for mounting a spray ring or the like to the duct and having improved vibration isolation characteristics. It comprises a clevis arranged for fixed mounting to the duct, a circular pin mounted in the clevis, an elongated slider having a central circular axial bore and mounted for rotational movement on the pin, the slider having at least two parallel exterior sidewalls, and a bracket for mounting the spray ring having an elongated bore mounted on the slider.

Barcza, W.K.; Concordia, M.J.

1992-07-07

39

Star formation in Galactic spiral arms and the interarm regions  

NASA Astrophysics Data System (ADS)

The line of sight through the Galactic plane between longitudes l = 37°.83 and 42°.50 allows for the separation of Galactic Ring Survey molecular clouds into those that fall within the spiral arms and those located in the interarm regions. By matching these clouds in both position and velocity with dense clumps detected in the mm continuum by the Bolocam Galactic Plane Survey, we are able to look for changes in the clump formation efficiency (CFE), the ratio of clump to cloud mass, with Galactic environment. We find no evidence of any difference in the CFE between the interarm and spiral-arm regions along this line of sight. This is further evidence that, outside the Galactic Centre region, the large-scale structures of the Galaxy play little part in changing the dense, potentially star-forming structures within molecular clouds.

Eden, D. J.; Moore, T. J. T.; Morgan, L. K.; Thompson, M. A.; Urquhart, J. S.

2013-05-01

40

Using CS (2-1) to Determine the Galactic Distribution Of Infrared Dark Clouds  

Microsoft Academic Search

Infrared Dark Clouds (IRDCs) are cold, dense molecular clouds which host the earliest stages of high-mass star and cluster formation. A disparity was found in the Galactic distribution of IRDCs in the first and fourth Galactic quadrants. Simon et al. (2006) used the Boston University-Five College Radio Astronomy Observatory (BU-FCRAO) Galactic Ring Survey (GRS) to establish kinematic distances to over

Susanna C. Finn; J. M. Jackson; E. T. Chambers; J. M. Rathborne; R. Simon

2010-01-01

41

Properties of Galactic B Supergiants  

NASA Astrophysics Data System (ADS)

Physical and wind properties of Galactic B supergiants are presented based upon non-LTE line blanketed model atmospheres, including Sher 25 toward the NGC 3603 cluster. We compare H? derived wind densities with recent results for SMC B supergiants and generally confirm theoretical expectations for stronger winds amongst Galactic supergiants. Mid B supergiant winds are substantially weaker than predictions from current radiatively driven wind theory, a problem which is exacerbated if winds are already clumped in the H? line forming region. We find that the so-called `bistability jump' at B1 (Teff ˜ 21kK) from Lamers et al. is rather a more gradual downward trend. CNO elemental abundances, including Sher 25, reveal partially processed material at their surfaces. In general, these are in good agreement with evolutionary predictions for blue supergiants evolving redward accounting for rotational mixing. A few cases, including HD 152236 (?1 Sco), exhibit strongly processed material which is more typical of Luminous Blue Variables. Our derived photospheric [N/O] ratio for Sher 25 agrees with that for its ring nebula, although a higher degree of CNO processing would be expected if the nebula originated during a red supergiant phase, as is suspected for the ring nebula ejected by the B supergiant progenitor of SN 1987A, Sk--69° 202. Sher 25 has an inferred age of ˜5 Myr in contrast with ˜2 Myr for HD 97950, the ionizing cluster of NGC 3603, so it may be a foreground object or close binary evolution may be responsible for its unusual location in the H-R diagram.

Crowther, P. A.; Lennon, D. J.; Walborn, N. R.; Smartt, S. J.

2008-06-01

42

3. EXTERIOR VIEW OF THE FRONT CORRIDOR OF THE CENTER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. EXTERIOR VIEW OF THE FRONT CORRIDOR OF THE CENTER WING OF BUILDING 654 FACING NORTHWEST. - U.S. Naval Base, Pearl Harbor, Bachelor Enlisted Quarters, Cromwell Circle, Pearl City, Honolulu County, HI

43

3. EXTERIOR FRONT OF TRIPLEX COTTAGE. CONCRETE STEPS IN FOREGROUND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. EXTERIOR FRONT OF TRIPLEX COTTAGE. CONCRETE STEPS IN FOREGROUND LEAD TO SECOND FLOOR WEST SIDE APARTMENT. VIEW TO SOUTH. - Lee Vining Creek Hydroelectric System, Triplex Cottage, Lee Vining Creek, Lee Vining, Mono County, CA

44

4. EXTERIOR DETAIL OF TRIPLEX COTTAGE FRONT SHOWING ENTRANCE TO ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. EXTERIOR DETAIL OF TRIPLEX COTTAGE FRONT SHOWING ENTRANCE TO FIRST FLOOR APARTMENT. VIEW TO SOUTHEAST. - Lee Vining Creek Hydroelectric System, Triplex Cottage, Lee Vining Creek, Lee Vining, Mono County, CA

45

EXTERIOR VIEW, BLAST FURNACE NO. 3 (JANE FURNACE) CENTER, NO. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR VIEW, BLAST FURNACE NO. 3 (JANE FURNACE) CENTER, NO. 3 CAST HOUSE TO THE LEFT, WEST ORE BRIDGE TO THE RIGHT. - Pittsburgh Steel Company, Monessen Works, Blast Furnace No. 3, Donner Avenue, Monessen, Westmoreland County, PA

46

4. DETAIL VIEW OF CROSS SECTION OF STRUCTURE, SHOWING EXTERIOR ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. DETAIL VIEW OF CROSS SECTION OF STRUCTURE, SHOWING EXTERIOR FACINGS LINED WITH RUBBLE BACKING AND EARTH INFILL, LOOKING EAST - Rock Wall, North side of Battle Creek Canyon, Shingletown, Shasta County, CA

47

28. EXTERIOR, VIEW FROM THE DECK OF THE UMBRA TO ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

28. EXTERIOR, VIEW FROM THE DECK OF THE UMBRA TO THE EAST PORCH FROM THE SOUTH - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

48

2. VAL CONTROL STATION, VIEW OF INTERIOR SHOWING EXTERIOR DOOR, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. VAL CONTROL STATION, VIEW OF INTERIOR SHOWING EXTERIOR DOOR, WINDOWS AND CONTROL PANELS, LOOKING SOUTHEAST. - Variable Angle Launcher Complex, Control Station, CA State Highway 39 at Morris Reservior, Azusa, Los Angeles County, CA

49

1. EXTERIOR VIEW OF BUILDING THAT HOUSES THE HOT ROLL ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW OF BUILDING THAT HOUSES THE HOT ROLL MILL, ALSO KNOWN AS THE NO. 31 HOT ROLL MILL; LOOKING SOUTHWEST - American Brass Company, Kenosha Works, Hot Roll Mill, Kenosha, Kenosha County, WI

50

EXTERIOR VIEW WITH HEART OF DIXIE MUSEUM'S HISTORIC LOCOMOTIVE IN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR VIEW WITH HEART OF DIXIE MUSEUM'S HISTORIC LOCOMOTIVE IN MUSEUM'S POWELL AVENUE YARD (BOTTOM) AND SOUTHERN RAILWAY BOXCAR ON ACTIVE TRACKAGE (ABOVE). - Heart of Dixie Railroad, Rolling Stock, 1800 Block Powell Avenue, Birmingham, Jefferson County, AL

51

16. INTERIOR, SECOND FLOOR, DETAIL OF PREVIOUSLY EXTERIOR POST AT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

16. INTERIOR, SECOND FLOOR, DETAIL OF PREVIOUSLY EXTERIOR POST AT EAST WALL, SHOWING NOTCHES FOR WEATHERBOARDS AND CRUDE FINISHING OF THE OAK FRAMING - Robeson-Williams Grist Mill, Roslyn, Nassau County, NY

52

View of the exterior of Irving Powerhouse also showing the ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View of the exterior of Irving Powerhouse also showing the office building at right. Looking south-southeast. - Childs-Irving Hydroelectric Project, Irving System, Irving Powerhouse, Forest Service Road 708/502, Camp Verde, Yavapai County, AZ

53

2. EXTERIOR OF WEST SIDE OF POWERHOUSE BUILDING SHOWING BOTH ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. EXTERIOR OF WEST SIDE OF POWERHOUSE BUILDING SHOWING BOTH PENSTOCKS ENTERING SECOND FLOOR OF POWERHOUSE VIEW TO SOUTH. - Rush Creek Hydroelectric System, Powerhouse Exciters, Rush Creek, June Lake, Mono County, CA

54

45. EXTERIOR VIEW, GREEN SWITCH TOLWER, COS COB, SHOWING BARS ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

45. EXTERIOR VIEW, GREEN SWITCH TOLWER, COS COB, SHOWING BARS AND PIPES LEADING TO SWITCHES - New York, New Haven & Hartford Railroad, Automatic Signalization System, Long Island Sound shoreline between Stamford & New Haven, Stamford, Fairfield County, CT

55

44. EXTERIOR VIEW, GREEN SWITCH TOWER, COS COB, SHOWING BARS ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

44. EXTERIOR VIEW, GREEN SWITCH TOWER, COS COB, SHOWING BARS LINKING SWITCH LEVERS AND PIPES LEADING TO SWITCHES - New York, New Haven & Hartford Railroad, Automatic Signalization System, Long Island Sound shoreline between Stamford & New Haven, Stamford, Fairfield County, CT

56

40. EXTERIOR VIEW, BERK SWITCH TOWER, SOUTH NORWALK, SHOWING FRONT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

40. EXTERIOR VIEW, BERK SWITCH TOWER, SOUTH NORWALK, SHOWING FRONT ELEVATION AND PIPES LEADING TO SWITCHES - New York, New Haven & Hartford Railroad, Automatic Signalization System, Long Island Sound shoreline between Stamford & New Haven, Stamford, Fairfield County, CT

57

39. EXTERIOR VIEW, BERK SWITCH TOWER, SOUTH NORWALK, SHOWING WEST ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

39. EXTERIOR VIEW, BERK SWITCH TOWER, SOUTH NORWALK, SHOWING WEST FACE AND ENTRANCE STAIRWAY - New York, New Haven & Hartford Railroad, Automatic Signalization System, Long Island Sound shoreline between Stamford & New Haven, Stamford, Fairfield County, CT

58

Exterior, looking northnorthwest at south elevation with entrance to facility ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior, looking north-northwest at south elevation with entrance to facility - Over-the-Horizon Backscatter Radar Network, Bangor Air National Guard Base Operations Building, At the end of Maine Road, Bangor, Penobscot County, ME

59

Exteriors with Hull Damage as of 2008, Port Profile, Stern ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exteriors with Hull Damage as of 2008, Port Profile, Stern Profile, Bow Profile, Loose Plate - Sub Marine Explorer, Located along the beach of Isla San Telmo, Pearl Islands, Isla San Telmo, Former Panama Canal Zone, CZ

60

Exterior view looking northwest with construction facilities of "new" pumping ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior view looking northwest with construction facilities of "new" pumping station in foreground. Doug Hine is man in picture. - Burnsville Natural Gas Pumping Station, Saratoga Avenue between Little Kanawha River & C&O Railroad line, Burnsville, Braxton County, WV

61

Exterior view of boiler house looking southwest with steam exhaust ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior view of boiler house looking southwest with steam exhaust vents in foreground. Engine house is on left. - Burnsville Natural Gas Pumping Station, Saratoga Avenue between Little Kanawha River & C&O Railroad line, Burnsville, Braxton County, WV

62

6. Exterior oblique view of Building 6, southwest corner, looking ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. Exterior oblique view of Building 6, southwest corner, looking north-northeast. - Rocky Mountain Laboratories, Building No. 6, 903 South Fourth Street between Building Nos. 1 & 7, Hamilton, Ravalli County, MT

63

Exterior view of hipped roof with coffee processing structure in ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior view of hipped roof with coffee processing structure in background, view towards the southwest - Pou Coffee Processing Structure, Casa No. 2, Highway 139, Kilometer 12, Maraguez, Ponce Municipio, PR

64

5. VIEW OF EXTERIOR FACINGS, SOUTH ELEVATION, ILLUSTRATING RANDOM COURSING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. VIEW OF EXTERIOR FACINGS, SOUTH ELEVATION, ILLUSTRATING RANDOM COURSING THAT USES UNSQUARED, IRREGULAR BASALT STONE WITH SMALLER FRAGMENTS SNECKED INTO THE JOINTING, LOOKING NORTH - Rock Wall, North side of Battle Creek Canyon, Shingletown, Shasta County, CA

65

Detail, exterior side of doubleplanked north end, Burton Park Club ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail, exterior side of double-planked north end, Burton Park Club House, view to south-southwest (135mm lens). - Burton Park, Club House & Amphitheater, Adjacent ot south end of Chestnut Avenue, San Carlos, San Mateo County, CA

66

4. FRONT PORCH EXTERIOR DETAIL SHOWING PLANK CEILING, LIGHT FIXTURE, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. FRONT PORCH EXTERIOR DETAIL SHOWING PLANK CEILING, LIGHT FIXTURE, AND DORIC COLUMNS. VIEW TO SOUTH. - Big Creek Hydroelectric System, Big Creek Town, Operator House, Orchard Avenue south of Huntington Lake Road, Big Creek, Fresno County, CA

67

3. BUILDING 901, EXTERIOR DETAILING ON NORTH SIDE SHOWING CONCRETE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. BUILDING 901, EXTERIOR DETAILING ON NORTH SIDE SHOWING CONCRETE FOUNDATION AND METAL TERMITE SHIELD. - Presidio of San Francisco, Warehouse, West End of Crissy Field, Livingston Street, San Francisco, San Francisco County, CA

68

1. BLOWER (EXTERIOR CONFIGURATION). Hot Springs National Park Bathhouse ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. BLOWER (EXTERIOR CONFIGURATION). - Hot Springs National Park Bathhouse Row, Maurice Bathhouse: Mechanical & Piping Systems, State Highway 7, 1 mile north of U.S. Highway 70, Hot Springs, Garland County, AR

69

EXTERIOR NORTH VIEW, WITH BUILDING 91 (ORIGINALLY THE WRIGHT FIELD ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR NORTH VIEW, WITH BUILDING 91 (ORIGINALLY THE WRIGHT FIELD LAUNDRY) IN THE FOREGROUND - Wright-Patterson Air Force Base, Area B, Building 67, Emergency Power Plant, North side of Third Street between D & E Streets, Dayton, Montgomery County, OH

70

EXTERIOR CLOSEUP VIEW OF SINGLE BAY ON WEST FACADE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR CLOSEUP VIEW OF SINGLE BAY ON WEST FACADE - Wright-Patterson Air Force Base, Area B, Building 56, Wright Field Warehouse, block bounded by E & F, Third & Fifth Streets, Dayton, Montgomery County, OH

71

Facility No. 175, exterior oblique view of northeast and northwest ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Facility No. 175, exterior oblique view of northeast and northwest sides, corner of Facility No. 176 is in background - U.S. Naval Base, Pearl Harbor, Landplane Hangar Type, Wasp Boulevard and Gambier Bay Street, Pearl City, Honolulu County, HI

72

7. EXTERIOR DETAIL OF CASEMENT WINDOW ARRANGEMENT AND ORIGINAL WOODSHINGLE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. EXTERIOR DETAIL OF CASEMENT WINDOW ARRANGEMENT AND ORIGINAL WOOD-SHINGLE SIDING INSIDE SCREENED-IN PORCH. VIEW TO WEST. - Bishop Creek Hydroelectric System, Plant 4, Worker Cottage, Bishop Creek, Bishop, Inyo County, CA

73

5. DETAIL EXTERIOR VIEW OF CUPOLA AND WEATHER VANE ON ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. DETAIL EXTERIOR VIEW OF CUPOLA AND WEATHER VANE ON TOP OF THE FISH HATCHERY BUILDING. - Bonneville Project, Fish Hatchery, On Columbia River bordered on South by Union Pacific, Bonneville, Multnomah County, OR

74

Looking Southwest to Dry and Wet Exterior Scrubbers at Rear ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Looking Southwest to Dry and Wet Exterior Scrubbers at Rear of Oxide Building - Hematite Fuel Fabrication Facility, Oxide Building & Oxide Loading Dock, 3300 State Road P, Festus, Jefferson County, MO

75

25. Photocopy of photograph (Source unknown, c. 19231925) EXTERIOR, CLOSEUP ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

25. Photocopy of photograph (Source unknown, c. 1923-1925) EXTERIOR, CLOSE-UP OF SOUTH FRONT OF MISSION AFTER RESTORATION, C. 1923-1925 - Mission San Francisco Solano de Sonoma, First & Spain Streets, Sonoma, Sonoma County, CA

76

14. EAST ELEVATION, COTTAGE. EXTERIOR NEARLY RESTORED. INTERIOR UNDERGOING RESTORATION. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

14. EAST ELEVATION, COTTAGE. EXTERIOR NEARLY RESTORED. INTERIOR UNDERGOING RESTORATION. EUCALYPTUS TREE PLANTED BY GERTRUDE KEIL PLANNED FOR REMOVAL. - Gold Ridge Farm, 7777 Bodega Avenue, Sebastopol, Sonoma County, CA

77

7. NORTH EXTERIOR SIDE SHOWING TRIANGULAR KNEE BRACE SUPPORTS AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. NORTH EXTERIOR SIDE SHOWING TRIANGULAR KNEE BRACE SUPPORTS AND ENCLOSED PORCH SCREENED WINDOWS. VIEW TO SOUTH. - Big Creek Hydroelectric System, Powerhouse 8, Operator Cottage, Big Creek, Big Creek, Fresno County, CA

78

37. Exterior view of main yard. Stock room building (left), ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

37. Exterior view of main yard. Stock room building (left), old machine shop (center), steel fabrication building (right), and traveling yard crane (middle fore). - Barbour Boat Works, Tryon Palace Drive, New Bern, Craven County, NC

79

50. Exterior view of yard with detail of concrete keel ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

50. Exterior view of yard with detail of concrete keel block for laying vessels on. Steel fabrication builders in background. American traveling yard crane. - Barbour Boat Works, Tryon Palace Drive, New Bern, Craven County, NC

80

Detail exterior view looking north showing piping system adjacent to ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail exterior view looking north showing piping system adjacent to engine house. Gas cooling system is on far right. - Burnsville Natural Gas Pumping Station, Saratoga Avenue between Little Kanawha River & C&O Railroad line, Burnsville, Braxton County, WV

81

Detail exterior view looking northwest showing field gas cleaner in ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail exterior view looking northwest showing field gas cleaner in the center. - Burnsville Natural Gas Pumping Station, Saratoga Avenue between Little Kanawha River & C&O Railroad line, Burnsville, Braxton County, WV

82

Detail exterior view looking southwest of gas cooling system. Engine ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail exterior view looking southwest of gas cooling system. Engine house is shown in right background. - Burnsville Natural Gas Pumping Station, Saratoga Avenue between Little Kanawha River & C&O Railroad line, Burnsville, Braxton County, WV

83

6. EXTERIOR OF REAR (EAST END) AND NORTH SIDE SHOWING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. EXTERIOR OF REAR (EAST END) AND NORTH SIDE SHOWING ASBESTOS SIDING, BACKYARD LAWN, AND CLOTHESLINE. VIEW TO SOUTHWEST. - Bishop Creek Hydroelectric System, Plant 4, Worker Cottage, Bishop Creek, Bishop, Inyo County, CA

84

3. EXTERIOR, VIEW TO NORTHEAST, AT NEW SITE (HERITAGE PARK). ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. EXTERIOR, VIEW TO NORTHEAST, AT NEW SITE (HERITAGE PARK). SHERMAN-GILBERT HOUSE AT LEFT; BUSHYLEAD HOUSE IN CENTER; CHRISTIAN HOUSE AT RIGHT - Sherman-Gilbert House, Heritage Park, San Diego, San Diego County, CA

85

1. VIEW OF BUILDING 883 EXTERIOR, LOOKING SOUTHEAST. VENTILATION EQUIPMENT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. VIEW OF BUILDING 883 EXTERIOR, LOOKING SOUTHEAST. VENTILATION EQUIPMENT IS VISIBLE. (11/27/56) - Rocky Flats Plant, Uranium Rolling & Forming Operations, Southeast section of plant, southeast quadrant of intersection of Central Avenue & Eighth Street, Golden, Jefferson County, CO

86

2. EXTERIOR OBLIQUE AXIAL CONTEXT VIEW BETWEEN BUILDINGS 542 AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. EXTERIOR OBLIQUE AXIAL CONTEXT VIEW BETWEEN BUILDINGS 542 AND 543, LOOKING SOUTHWEST. - Oakland Naval Supply Center, Warehouse Type D, Maritime Street at Seventh Avenue, Oakland, Alameda County, CA

87

1. EXTERIOR SOUTHWEST CORNER VIEW, FACING NORTHEAST. BUILDING NO. 42 ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR SOUTHWEST CORNER VIEW, FACING NORTHEAST. BUILDING NO. 42 GARAGE & TRANSPORTATION MAINTENANCE FACILITY - NASA Industrial Plant, Garage & Transportation Maintenance Facility, 12214 Lakewood Boulevard, Downey, Los Angeles County, CA

88

4. EXTERIOR NORTHWEST CORNER VIEW, FACING SOUTHEAST. BUILDING NO 42 ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. EXTERIOR NORTHWEST CORNER VIEW, FACING SOUTHEAST. BUILDING NO 42 GARAGE & TRANSPORTATION MAINTENANCE FACILITY - NASA Industrial Plant, Garage & Transportation Maintenance Facility, 12214 Lakewood Boulevard, Downey, Los Angeles County, CA

89

3. EXTERIOR NORTHEAST CORNER VIEW, FACING SOUTHWEST. BUILDING NO 42 ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. EXTERIOR NORTHEAST CORNER VIEW, FACING SOUTHWEST. BUILDING NO 42 GARAGE & TRANSPORTATION MAINTENANCE FACILITY - NASA Industrial Plant, Garage & Transportation Maintenance Facility, 12214 Lakewood Boulevard, Downey, Los Angeles County, CA

90

2. EXTERIOR SOUTHEAST CORNER VIEW, FACING NORTHWEST. BUILDING NO 42 ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. EXTERIOR SOUTHEAST CORNER VIEW, FACING NORTHWEST. BUILDING NO 42 GARAGE & TRANSPORTATION MAINTENANCE FACILITY - NASA Industrial Plant, Garage & Transportation Maintenance Facility, 12214 Lakewood Boulevard, Downey, Los Angeles County, CA

91

General exterior view to northeast (Building 203 in background right) ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

General exterior view to northeast (Building 203 in background right) - Charlestown Navy Yard, Oxygen Plant, Midway along northern boundary of Charlestown Navy Yard, on Little Mystic Channel, near junction of Eighteenth Street & Fourth Avenue, Boston, Suffolk County, MA

92

13. EXTERIOR, STEAM DRIVED AIR COMPRESSOR IN THE MACHINE SHOP, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

13. EXTERIOR, STEAM DRIVED AIR COMPRESSOR IN THE MACHINE SHOP, NOTE BELL-DRIVES CA. 1937. - Hardie-Tynes Manufacturing Company, Workshop, 800 Twenty-eighth Street North, Birmingham, Jefferson County, AL

93

18. GENERAL EXTERIOR VIEW LOOKING NORTHEAST, SHOWING FISH LADDER ON ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

18. GENERAL EXTERIOR VIEW LOOKING NORTHEAST, SHOWING FISH LADDER ON BRADFORD ISLAND; DAM/SPILLWAY IS VISIBLE IN CENTER BACKGROUND. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

94

9. Interior view of conference room; showing exterior windows; northeast ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. Interior view of conference room; showing exterior windows; northeast corner of north wing; view to northeast. - Ellsworth Air Force Base, Administration Office, 2704 George Drive, Blackhawk, Meade County, SD

95

9. Interior view of large conference room; showing exterior windows; ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. Interior view of large conference room; showing exterior windows; middle of west side of building on main floor; view to northwest. - Ellsworth Air Force Base, Mess & Administration Building, 1561 Ellsworth Street, Blackhawk, Meade County, SD

96

8. EXTERIOR DETAIL OF FRONT ENTRY PORCH SHOWING ORIGINAL ARTS ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. EXTERIOR DETAIL OF FRONT ENTRY PORCH SHOWING ORIGINAL ARTS AND CRAFTS STYLE ELECTRICAL LANTERN. VIEW TO SOUTH. - Rush Creek Hydroelectric System, Clubhouse Cottage, Rush Creek, June Lake, Mono County, CA

97

1. NEUTRAL BUOYANCY SIMULATOR BUILDING (NBS) EXTERIOR ELEVATION LOOKING NORTH; ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. NEUTRAL BUOYANCY SIMULATOR BUILDING (NBS) EXTERIOR ELEVATION LOOKING NORTH; TANK BUILDING TO LEFT, CONTROL ROOM ETC. TO RIGHT OF CONNECTING BAY. - Marshall Space Flight Center, Neutral Buoyancy Simulator Facility, Rideout Road, Huntsville, Madison County, AL

98

EXTERIOR VIEW SHOWING THE OILOSTATIC TERMINALS IN THE GENERATING PLANT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR VIEW SHOWING THE OILOSTATIC TERMINALS IN THE GENERATING PLANT SWITCH YARD. - Wilson Dam & Hydroelectric Plant, Oilostatic Transmission System, Spanning Tennessee River at Wilson Dam Road (Route 133), Muscle Shoals, Colbert County, AL

99

6. EXTERIOR VIEW TO THE SOUTH OF THE NORTH ELEVATION ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. EXTERIOR VIEW TO THE SOUTH OF THE NORTH ELEVATION OF THE HOT DISASSEMBLY AREA. - Nevada Test Site, Reactor Maintenance Assembly & Dissassembly Facility, Area 25, Jackass Flats, Junction of Roads F & G, Mercury, Nye County, NV

100

2. EXTERIOR VIEW TO THE NORTH OF THE SOUTH ELEVATION ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. EXTERIOR VIEW TO THE NORTH OF THE SOUTH ELEVATION OF THE HOT DISASSEMBLY AREA. - Nevada Test Site, Reactor Maintenance Assembly & Dissassembly Facility, Area 25, Jackass Flats, Junction of Roads F & G, Mercury, Nye County, NV

101

7. EXTERIOR VIEW TO THE SOUTHWEST OF THE NORTH AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. EXTERIOR VIEW TO THE SOUTHWEST OF THE NORTH AND EAST ELEVATIONS. - Nevada Test Site, Reactor Maintenance Assembly & Dissassembly Facility, Area 25, Jackass Flats, Junction of Roads F & G, Mercury, Nye County, NV

102

4. EXTERIOR VIEW TO THE EAST OF THE WEST ELEVATION ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. EXTERIOR VIEW TO THE EAST OF THE WEST ELEVATION OF THE COLD ASSEMBLY AREA. - Nevada Test Site, Reactor Maintenance Assembly & Dissassembly Facility, Area 25, Jackass Flats, Junction of Roads F & G, Mercury, Nye County, NV

103

9. EXTERIOR VIEW TO THE NORTHWEST OF THE SOUTH AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. EXTERIOR VIEW TO THE NORTHWEST OF THE SOUTH AND EAST ELEVATIONS. - Nevada Test Site, Reactor Maintenance Assembly & Dissassembly Facility, Area 25, Jackass Flats, Junction of Roads F & G, Mercury, Nye County, NV

104

8. EXTERIOR VIEW TO THE WEST OF THE EAST ELEVATION ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. EXTERIOR VIEW TO THE WEST OF THE EAST ELEVATION OF THE HOT DISASSEMBLY AREA. - Nevada Test Site, Reactor Maintenance Assembly & Dissassembly Facility, Area 25, Jackass Flats, Junction of Roads F & G, Mercury, Nye County, NV

105

1. EXTERIOR CONTEXT VIEW OF BUILDING 620, THE SEWAGE EJECTOR, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR CONTEXT VIEW OF BUILDING 620, THE SEWAGE EJECTOR, LOOKING NORTHEAST. - Mill Valley Air Force Station, Sewage Ejector, East Ridgecrest Boulevard, Mount Tamalpais, Mill Valley, Marin County, CA

106

Photographic copy of reproduced photograph dated 1942. Exterior view, west ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Photographic copy of reproduced photograph dated 1942. Exterior view, west elevation. Building camouflaged during World War II. - Grand Central Air Terminal, 1310 Air Way, Glendale, Los Angeles County, CA

107

Transverse electromagnetic horn antenna with resistively-loaded exterior surfaces  

DOEpatents

An improved transverse electromagnetic (TEM) horn antenna comprises a resistive loading material on the exterior surfaces of the antenna plates. The resistive loading material attenuates or inhibits currents on the exterior surfaces of the TEM horn antenna. The exterior electromagnetic fields are of opposite polarity in comparison to the primary and desired interior electromagnetic field, thus inherently cause partial cancellation of the interior wave upon radiation or upon reception. Reducing the exterior fields increases the radiation efficiency of the antenna by reducing the cancellation of the primary interior field (supported by the interior surface currents). This increases the transmit gain and receive sensitivity of the TEM horn antenna, as well as improving the transient (time-domain) response.

Aurand, John F. (Edgewood, NM)

1999-01-01

108

Exterior view of southern half of east porch, showing entrance ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior view of southern half of east porch, showing entrance to second story of la casa, view towards the west - Pou Coffee Processing Structure, Casa No. 2, Highway 139, Kilometer 12, Maraguez, Ponce Municipio, PR

109

Exterior, looking west Beale Air Force Base, Perimeter Acquisition ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior, looking west - Beale Air Force Base, Perimeter Acquisition Vehicle Entry Phased-Array Warning System, Clean Lubrication Oil Storage Tank & Enclosure, End of Spencer Paul Road, north of Warren Shingle Road (14th Street), Marysville, Yuba County, CA

110

29. View of exterior of bathroom located in southwest corner ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

29. View of exterior of bathroom located in southwest corner of central section. Photo was taken on Oct 22, 2002, looking southwest. - College Heights Lemon Packing House, 519-532 West First Street, Claremont, Los Angeles County, CA

111

1. EXTERIOR VIEW, LOOKING NORTH NORTHEAST ALONG EASTERN VALLEY ROAD, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW, LOOKING NORTH NORTHEAST ALONG EASTERN VALLEY ROAD, WITH FRONT AND SIDE (WEST) ELEVATIONS AND REAR ADDITIONS - Thomas H. Owen House, Eastern Valley Road West of State Road 150, McCalla, Jefferson County, AL

112

40. Exterior view of dockage, marine railway #4, and assembly ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

40. Exterior view of dockage, marine railway #4, and assembly building. Note BBW Tug Sam on railway and BBW-Built Stardust (#1) at end of dock. - Barbour Boat Works, Tryon Palace Drive, New Bern, Craven County, NC

113

Interior view of bedroom 2 showing louvers in former exterior ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Interior view of bedroom 2 showing louvers in former exterior window opening, facing northwest. - Albrook Air Force Station, Field Officer's Quarters, West side of Dargue Avenue Circle, Balboa, Former Panama Canal Zone, CZ

114

7. EXTERIOR OF POWER PLANT BUILDING LOOKING NORTHWEST. DETAIL OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. EXTERIOR OF POWER PLANT BUILDING LOOKING NORTHWEST. DETAIL OF TRASH RACK IN FOREGROUND. - Potomac Power Plant, On West Virginia Shore of Potomac River, about 1 mile upriver from confluence with Shenandoah River, Harpers Ferry, Jefferson County, WV

115

9. EXTERIOR PERSPECTIVE OF POWER PLANT BUILDING LOOKING NORTHEAST. DRY ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. EXTERIOR PERSPECTIVE OF POWER PLANT BUILDING LOOKING NORTHEAST. DRY CANAL BED IN FOREGROUND. - Potomac Power Plant, On West Virginia Shore of Potomac River, about 1 mile upriver from confluence with Shenandoah River, Harpers Ferry, Jefferson County, WV

116

2. EXTERIOR OF THE STORAGE SHED LOCATED NEAR THE POOL, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. EXTERIOR OF THE STORAGE SHED LOCATED NEAR THE POOL, BUILDING 305 AND THE TANK, LOOKING NORTHWEST. - Mill Valley Air Force Station, Storage Shed & Tank, East Ridgecrest Boulevard, Mount Tamalpais, Mill Valley, Marin County, CA

117

1. EXTERIORS OF PAINT LOCKER, BUILDING 101, ON RIGHT, AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIORS OF PAINT LOCKER, BUILDING 101, ON RIGHT, AND CIVIL ENGINEERING STORAGE, BUILDING 105 ON LEFT, LOOKING NORTH. - Mill Valley Air Force Station, Storage Building Types, East Ridgecrest Boulevard, Mount Tamalpais, Mill Valley, Marin County, CA

118

1. EXTERIOR OF THE STORAGE SHED LOCATED NEAR THE POOL, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR OF THE STORAGE SHED LOCATED NEAR THE POOL, BUILDING 305 AND THE TANK, LOOKING EAST. - Mill Valley Air Force Station, Storage Shed & Tank, East Ridgecrest Boulevard, Mount Tamalpais, Mill Valley, Marin County, CA

119

1. EXTERIOR VIEW OF THE EXPLOSIVE STORAGE SHED, BUILDING 306, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW OF THE EXPLOSIVE STORAGE SHED, BUILDING 306, LOOKING NORTHWEST. - Mill Valley Air Force Station, Explosive Storage, East Ridgecrest Boulevard, Mount Tamalpais, Mill Valley, Marin County, CA

120

1. EXTERIOR VIEW LOOKING NORTHWEST; NOTE BRICK FLUE & WATER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW LOOKING NORTHWEST; NOTE BRICK FLUE & WATER STORAGE TANK TO RIGHT, 1973-ERA ADDITION TO LEFT - Fort McCoy, Building No. T-10111, Southeast of Auxiliary Boiler House, Block 10, Sparta, Monroe County, WI

121

5. EXTERIOR OF NORTH SIDE SHOWING ENCLOSED FRONT PORCH AREA, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. EXTERIOR OF NORTH SIDE SHOWING ENCLOSED FRONT PORCH AREA, ALUMINUM SLIDING GLASS WINDOW GLAZING REPLACEMENTS, AND RAILING FOR STAIRS TO BASEMENT. VIEW TO SOUTHWEST. - Bishop Creek Hydroelectric System, Plant 4, Worker Cottage, Bishop Creek, Bishop, Inyo County, CA

122

1. EXTERIOR VIEW OF COTTAGE 231 TAKEN FROM ROOF OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW OF COTTAGE 231 TAKEN FROM ROOF OF PUMP HOUSE. CAMERA FACING NORTH. NOTE ROCK RETAINING WALL BUILD WITH NATIVE LAVA ROCK FROM CANYON. - Swan Falls Village, Superintendent's Cottage, Snake River, Kuna, Ada County, ID

123

Exterior, detail, looking west Beale Air Force Base, Perimeter ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior, detail, looking west - Beale Air Force Base, Perimeter Acquisition Vehicle Entry Phased-Array Warning System, Power Plant, End of Spencer Paul Road, north of Warren Shingle Road (14th Street), Marysville, Yuba County, CA

124

Exterior view of the southwest side, taken from Facility No. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior view of the southwest side, taken from Facility No. 247 with Facility No. 6 beyond - U.S. Naval Base, Pearl Harbor, Scrap Metal Packaging Facility, Seventh Street between Facility Nos. 6 & 247, Pearl City, Honolulu County, HI

125

Exterior overall oblique view of the northeast and southeast sides ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior overall oblique view of the northeast and southeast sides - U.S. Naval Base, Pearl Harbor, Scrap Metal Packaging Facility, Seventh Street between Facility Nos. 6 & 247, Pearl City, Honolulu County, HI

126

3. EXTERIOR VIEW TO THE NORTHWEST OF A PERSONNEL GATE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. EXTERIOR VIEW TO THE NORTHWEST OF A PERSONNEL GATE IN THE SECURITY FENCE SURROUNDING THE MAIN BUILDINGS. - Nevada Test Site, Super Kukla Facility, Area 27, Rock Valley, South of Cane Spring Road, Mercury, Nye County, NV

127

1. EXTERIOR VIEW TO THE EAST OF THE ENTRANCE TO ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW TO THE EAST OF THE ENTRANCE TO THE SUBSURFACE CONTAINMENT BUILDING. - Nevada Test Site, Super Kukla Facility, Containment Building, Area 27, Rock Valley, South of Cane Spring Road, Mercury, Nye County, NV

128

3. EXTERIOR VIEW TO THE WEST OF THE NORTH AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. EXTERIOR VIEW TO THE WEST OF THE NORTH AND EAST ELEVATIONS OF THE HIGH BAY. - Nevada Test Site, Super Kukla Facility, High Bay, Area 27, Rock Valley, South of Cane Spring Road, Mercury, Nye County, NV

129

7. VIEW OF SOUTH ELEVATION (BOILER HOUSE EXTERIOR) LOOKING TOWARD ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. VIEW OF SOUTH ELEVATION (BOILER HOUSE EXTERIOR) LOOKING TOWARD COAL TOWER No. 1 FROM THE SOUTHEAST - Delaware County Electric Company, Chester Station, Delaware River at South end of Ward Street, Chester, Delaware County, PA

130

6. CLOSER VIEW OF THE SOUTH ELEVATION (BOILER HOUSE EXTERIOR) ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. CLOSER VIEW OF THE SOUTH ELEVATION (BOILER HOUSE EXTERIOR) AND COAL TOWER No. 2 - Delaware County Electric Company, Chester Station, Delaware River at South end of Ward Street, Chester, Delaware County, PA

131

3. EXTERIOR OF SOUTH SIDE SHOWING DOOR TO ENCLOSED FRONT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. EXTERIOR OF SOUTH SIDE SHOWING DOOR TO ENCLOSED FRONT PORCH ON PHOTO RIGHT AND DOOR TO KITCHEN AT PHOTO LEFT. VIEW TO NORTH. - Bishop Creek Hydroelectric System, Control Station, Worker Cottage, Bishop Creek, Bishop, Inyo County, CA

132

3. EXTERIOR VIEW, SHOWING CRANE SYSTEM BETWEEN BUILDING 20 AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. EXTERIOR VIEW, SHOWING CRANE SYSTEM BETWEEN BUILDING 20 AND 20A. - Wright-Patterson Air Force Base, Area B, Building No. 20A, Propeller Test Complex, Seventh Street, from E to G Streets, Dayton, Montgomery County, OH

133

DETAIL VIEW OF THE EXTERIOR, EAST ELEVATION, OF THE INSTRUMENTATION ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

DETAIL VIEW OF THE EXTERIOR, EAST ELEVATION, OF THE INSTRUMENTATION AND CONTROL TANKS LOOKING SOUTHWEST. - Marshall Space Flight Center, Redstone Rocket (Missile) Test Stand, Dodd Road, Huntsville, Madison County, AL

134

122. HISTORIC AMERICAN BUILDINGS SURVEY TEAM MEASURING EXTERIOR OF INDEPENDENCE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

122. HISTORIC AMERICAN BUILDINGS SURVEY TEAM MEASURING EXTERIOR OF INDEPENDENCE HALL (LEE NELSON ON CORNER LEANING OVER) - Independence Hall Complex, Independence Hall, 500 Chestnut Street, Philadelphia, Philadelphia County, PA

135

Detail view of exterior siding and "notching" at south corner ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Detail view of exterior siding and "notching" at south corner - Glacier Park Villas, Edna Sears Graham Cabin, South of Lake McDonald Lodge on Lake Mcdonald Lodge Loop Road, Lake McDonald, Flathead County, MT

136

1. EXTERIOR VIEW, OBLIQUE PERSPECTIVE, LOOKING NORTHEAST, WITH SIDE AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW, OBLIQUE PERSPECTIVE, LOOKING NORTHEAST, WITH SIDE AND FRONT ELEVATIONS OF THE CHURCH AND THE GAZEBO BAND STAND (LEFT) - St. Mark's Catholic Church, 1040 Tenth Avenue West, Thomas, Jefferson County, AL

137

CAR MACHINE SHOP, SECOND FLOOR, PAINT SPRAY ROOM EXTERIOR AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

CAR MACHINE SHOP, SECOND FLOOR, PAINT SPRAY ROOM EXTERIOR AND ATTIC FLOOR SUPPORT COLUMNS AND BEAMS, LOOKING WEST. - Southern Pacific, Sacramento Shops, Car Machine Shop, 111 I Street, Sacramento, Sacramento County, CA

138

22. FANTAIL DECK, SHOWING DETAIL OF DECK EXTENSION AND EXTERIOR ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

22. FANTAIL DECK, SHOWING DETAIL OF DECK EXTENSION AND EXTERIOR LOCKING MECHANISM ON HATCH DOOR TO CREW'S BERTHING. - U.S. Coast Guard Cutter WHITE HEATH, USGS Integrated Support Command Boston, 427 Commercial Street, Boston, Suffolk County, MA

139

Marguerite Arnet Residence, exterior roof structure detail, looking northwest. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Marguerite Arnet Residence, exterior roof structure detail, looking northwest. - Adam & Bessie Arnet Homestead, Marguerite Arnet Residence, 560 feet northeast of Adam & Bessie Arnet Residence, Model, Las Animas County, CO

140

9. TROJAN MILL, EXTERIOR FROM NORTHWEST, c. 191828. WINTER SNOW ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. TROJAN MILL, EXTERIOR FROM NORTHWEST, c. 1918-28. WINTER SNOW SHOWS LINE OF CRUDE ORE BIN STAIR. CREDIT JW. - Bald Mountain Gold Mill, Nevada Gulch at head of False Bottom Creek, Lead, Lawrence County, SD

141

2. EXTERIOR VIEW OF THE FRONT AND NORTHEAST SIDE OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. EXTERIOR VIEW OF THE FRONT AND NORTHEAST SIDE OF BUILDING 651 FACING SOUTH. - U.S. Naval Base, Pearl Harbor, Shore Intermediate-Maintenance Facility, Corner of Morton & Craig Streets, Pearl City, Honolulu County, HI

142

3. EXTERIOR VIEW OF THE REAR AND NORTHEAST SIDE OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. EXTERIOR VIEW OF THE REAR AND NORTHEAST SIDE OF BUILDING 651 FACING WEST. - U.S. Naval Base, Pearl Harbor, Shore Intermediate-Maintenance Facility, Corner of Morton & Craig Streets, Pearl City, Honolulu County, HI

143

3. EXTERIOR NORTH SIDE DETAIL VIEW, FACING SOUTHWEST. THE ROOFLINE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. EXTERIOR NORTH SIDE DETAIL VIEW, FACING SOUTHWEST. THE ROOFLINE CLEARLY SHOWS THE ATTACHMENTS TO THE NORTH (FORMERLY CANOPY 764) AND EAST (FORMERLY BUILDING 13). - NASA Industrial Plant, Maintenance Facility, 12214 Lakewood Boulevard, Downey, Los Angeles County, CA

144

6. EXTERIOR NORTHEAST CORNER VIEW, FACING SOUTHWEST. CLEAR SHOP OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. EXTERIOR NORTHEAST CORNER VIEW, FACING SOUTHWEST. CLEAR SHOP OF CANOPY 723 AS WELL NORTH FACADES OF ADDITIONS TO BUILDING 10. - NASA Industrial Plant, Maintenance Facility, 12214 Lakewood Boulevard, Downey, Los Angeles County, CA

145

1. EXTERIOR VIEW OF THE FRONT AND SOUTHWEST SIDE OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW OF THE FRONT AND SOUTHWEST SIDE OF BUILDING 651 FACING EAST. - U.S. Naval Base, Pearl Harbor, Shore Intermediate-Maintenance Facility, Corner of Morton & Craig Streets, Pearl City, Honolulu County, HI

146

Exterior vs. interior rotors in robotic brushless motors  

Microsoft Academic Search

rotor designs of 3-phase, axial-flux, slotted, brushless motors, using rare-earth neodymium magnets. These characteristics describe many brushless motors used in modern anthropomorphic robot designs (7-9). The intent of this study was to demonstrate both theoretically and experimentally that exterior-rotor motors are ideally suited for robotic application. This study has found that exterior- rotor motors substantially outperform all existing commercial brushless

Jonathon W. Sensinger; Stephen D. Clark; Jack F. Schorsch

2011-01-01

147

Planetary rings  

SciTech Connect

Among the topics discussed are the development history of planetary ring research, the view of planetary rings in astronomy and cosmology over the period 1600-1900, the characteristics of the ring systems of Saturn and Uranus, the ethereal rings of Jupiter and Saturn, dust-magnetosphere interactions, the effects of radiation forces on dust particles, the collisional interactions and physical nature of ring particles, transport effects due to particle erosion mechanisms, and collision-induced transport processes in planetary rings. Also discussed are planetary ring waves, ring particle dynamics in resonances, the dynamics of narrow rings, the origin and evolution of planetary rings, the solar nebula and planetary disk, future studies of the planetary rings by space probes, ground-based observatories and earth-orbiting satellites, and unsolved problems in planetary ring dynamics.

Greenberg, R.; Brahic, A.

1984-01-01

148

Galactic longitude dependent galactic model parameters  

NASA Astrophysics Data System (ADS)

We present the Galactic model parameters for thin disc estimated by Sloan Digital Sky Survey ( SDSS) data of 14 940 stars with apparent magnitudes 16 < g0 ? 21 in six intermediate latitude fields in the first Galactic quadrant. Star/galaxy separation was performed by using the SDSS photometric pipeline and the isodensity contours in the ( g - r) 0 - ( r - i) 0 two colour diagram. The separation of thin disc stars is carried out by the bimodal distribution of stars in the ( g - r) 0 histogram, and the absolute magnitudes were evaluated by a procedure presented in the literature (Bilir, S., Karaali, S., Tunçel, S. 2005. AN 326, 321). Exponential density law fits better to the derived density functions for the absolute magnitude intervals 8 < M( g) ? 9 and 11 < M( g) ? 12, whereas sech/sech 2 laws are more appropriate for absolute magnitude intervals 9 < M( g) ? 10 and 10 < M( g) ? 11. We showed that the scaleheight and scalelength are Galactic longitude dependent. The average values and ranges of the scaleheight and the scalelength are < H> = 220 pc (196 ? H ? 234 pc) and < H> = 1900 pc (1561 ? h ? 2280 pc) respectively. This result would be useful to explain different numerical values claimed for those parameters obtained by different authors for the fields in different directions of the Galaxy.

Bilir, S.; Karaali, S.; Ak, S.; Yaz, E.; Hamzao?lu, E.

2006-12-01

149

Dense molecular gas in galactic nuclei  

NASA Astrophysics Data System (ADS)

The results of investigations of cool dense interstellar media are reviewed with particular attention given to observational data. Instrument technologies are described which allow the investigation of circumnuclear gas in the galaxies that are devoid of H I and inaccessible at optical wavelengths. Molecular mass estimates and correlations between nuclear and global galactic properties are described. CO observations are discussed in relation to strongly interacting nearby galaxies, and models of bars and rings are presented. Correlations between the kinematic, physical, and chemical properties of the dense gas and nuclear regions of the Galaxy are listed, and the molecular properties of distant ultraluminous galaxies are reviewed. It is shown that 10 percent of the galaxies measured in H I can be detected in CO, and it is recommended that many high-resolution CO maps be obtained in order to evaluate nuclear gas properties statistically. Other significant techniques are proposed to improve the study of dense molecular gas in galactic nuclei.

Henkel, C.; Baan, W. A.; Mauersberger, R.

1991-06-01

150

Planetary Rings  

Microsoft Academic Search

The past two decades have witnessed dramatic changes in our view and understanding of planetary rings. We now know that each of the giant planets in the Solar System possesses a complex and unique ring system. Recent studies have identified complex gravitational interactions between the rings and their retinues of attendant satellites. Among the four known ring systems, we see

M. K. Gordon; S. Araki; G. J. Black; A. S. Bosh; A. Brahic; S. M. Brooks; S. Charnoz; J. E. Colwell; J. N. Cuzzi; L. Dones; R. H. Durisen; L. W. Esposito; C. Ferrari; M. Festou; R. G. French; S. M. Giuliatti-Winter; A. L. Graps; D. P. Hamilton; M. Horanyi; R. M. Karjalainen; A. V. Krivov; H. Krueger; S. M. Larson; H. F. Levison; M. C. Lewis; J. J. Lissauer; C. D. Murray; F. Namouni; P. D. Nicholson; C. B. Olkin; F. Poulet; N. J. Rappaport; H. J. Salo; J. Schmidt; M. R. Showalter; F. Spahn; L. J. Spilker; R. Srama; G. R. Stewart; P. Yanamandra-Fisher

2002-01-01

151

VERITAS Galactic Observations  

NASA Astrophysics Data System (ADS)

We report on recent Galactic results and discoveries made by the VERITAS collaboration. The Very Energetic Radiation Imaging Telescope Array System (VERITAS) is a ground-based gamma-ray observatory, located in southern Arizona, able to detect gamma rays of energies from 100 GeV up to 30 TeV. VERITAS has been fully operational since 2007 and its current sensitivity enables the detection of a 1% Crab Nebula flux at 5 sigma in under 30 hours. The observatory is well placed to view large parts of the galactic plane including its center, resulting in a strong galactic program. Objects routinely observed include Pulsars, Pulsar Wind Nebula, X-ray binaries and sources with unidentified counterparts in other wavelengths.

Hughes, Gareth

2013-06-01

152

The Galactic Habitable Zone  

SciTech Connect

We propose the concept of a 'Galactic Habitable Zone' (GHZ). Similar to the circumstellar habitable zone (CHZ), the GHZ is that region in a spiral galaxy where life can exist. The width of the GHZ is controlled by two factors. The inner (closest to the center of the galaxy) limit is set by threats to complex life: nearby transient sources of ionizing radiation and comet impacts. Such threats tend to increase close to the galactic center. The outer limit is imposed by galactic chemical evolution, specifically the abundance of heavier elements. Observation of stars in the Milky Way galaxy suggests that the outer reaches of a spiral galaxy may be too poor in heavy elements to allow terrestrial complex life to exist.

Gonzalez, Guillermo (Iowa State University)

2002-08-21

153

EXTERIOR PERSPECTIVE FROM BARN YARD SHOWING EAST AND SOUTH FAÇADES ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR PERSPECTIVE FROM BARN YARD SHOWING EAST AND SOUTH FAÇADES OF THE BARN, LOOKING NORTHWEST. The sliding door on the barns east façade leads into the animal pens and milking stalls. The barn?s hip-on-gable roof is covered in corrugated metal. The gable end is clad in board and battens, matching the rest of the barns exterior. The pump house can be seen to the north; the garage to the west. - Kineth Farm, Barn, 19162 STATE ROUTE 20, Coupeville, Island County, WA

154

Distribution of Si II in the Galactic center  

SciTech Connect

A map of the Galactic center region in the forbidden Si II 34.8-micron line is presented. The line emission arises from within the photodissociation region (PDR) associated with the neutral gas ring surrounding an ionized gas core confined within 2 pc of the Galactic center. Si II is a useful probe of the inner regions of the ring since it is always optically thin. The Si II data, when analyzed in conjunction with O I, C II, and molecular measurements, outlines the transition region between the PDR and the surrounding molecular cloud. The Si II emission is found to extend beyond that of the O II into the neutral gas ring. Although the interpretation is not unique, the data are consistent with a constant gas-phase abundance of silicon within the inner part of the PDR while the gaseous silicon is depleted by molecule formation in the transition region. 34 references.

Graf, P.; Herter, T.; Gull, G.E.; Houck, J.R.

1988-07-01

155

Galactic Positron Annihilation Radiation  

NASA Astrophysics Data System (ADS)

Nine years of observations with the CGRO/OSSE instrument have allowed the first maps of positron annihilation radiation. The extraction of annihilation radiation from a complex spectrum composed of both compact and diffuse sources depends upon the unique spectral signatures of 511 keV line and positronium continuum emissions. We report here results of a re-analysis of OSSE obtained spectra of the galactic center region. We show updated maps of annihilation radiation, and discuss how these maps influence the interpretation of suggested sources of galactic positrons.

Milne, P. A.; Kurfess, J. D.; Strickman, M. S.; Leising, M. D.

2002-05-01

156

PREFACE: Galactic Center Workshop 2006  

Microsoft Academic Search

We are pleased to present the proceedings from the Galactic Center Workshop 2006---From the Center of the Milky Way to Nearby Low-Luminosity Galactic Nuclei. The conference took place in the Physikzentrum, Bad Honnef, Germany, on 18 to 22 April 2006. It is the third workshop of this kind, following the Galactic Center Workshops held 1998 in Tucson, Arizona, and 2002

Rainer Schödel; Geoffrey C. Bower; Michael P. Muno; Sergei Nayakshin; Thomas Ott

2006-01-01

157

8. EXTERIOR OF FRONT (SOUTH) SIDE OF BUILDING 102 SHOWING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. EXTERIOR OF FRONT (SOUTH) SIDE OF BUILDING 102 SHOWING THE SHED-ROOFED PORCH, THE TWO MAIN FRONT DOORS (ON EITHER SIDE OF THE INSIDE ELBOW OF THIS SIDE OF THE HOUSE), AND AN EARLY CHIMNEY WITH CORBELED BRICK CAP. VIEW TO NORTHWEST. - Bishop Creek Hydroelectric System, Plant 6, Cashbaugh-Kilpatrick House, Bishop Creek, Bishop, Inyo County, CA

158

2. EXTERIOR BACK (NORTHEAST) SIDE OF BUILDING 102. BISHOP CREEK ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. EXTERIOR BACK (NORTHEAST) SIDE OF BUILDING 102. BISHOP CREEK TRANSMISSION LINES PASS DIRECTLY OVERHEAD. 1953 FLAT-ROOFED ADDITION CONSTITUTES CORNER OF THE HOUSE IN THE FOREGROUND. VIEW TO SOUTHWEST. - Bishop Creek Hydroelectric System, Plant 6, Cashbaugh-Kilpatrick House, Bishop Creek, Bishop, Inyo County, CA

159

EXTERIOR PERSPECTIVE OF GRANARY SHOWING ADDITION, LOOKING NORTH. (When the ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR PERSPECTIVE OF GRANARY SHOWING ADDITION, LOOKING NORTH. (When the granary was adapted into a family home, an addition was added onto the west façade. The Gould house is visible in the distance, at the left.) - Smith Farm, Granary, 399 Ebey Road, Coupeville, Island County, WA

160

6. EXTERIOR OF TRIPLEX COTTAGE WEST SIDE SHOWING CONCRETE STAIRWAY ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. EXTERIOR OF TRIPLEX COTTAGE WEST SIDE SHOWING CONCRETE STAIRWAY TO SECOND FLOOR WEST SIDE APARTMENT. DOOR TO ENCLOSED PORTION OF ENTRYWAY IS VISIBLE AT TOP OF STAIRS. VIEW TO SOUTH. - Lee Vining Creek Hydroelectric System, Triplex Cottage, Lee Vining Creek, Lee Vining, Mono County, CA

161

52. NORTHEASTERN EXTERIOR VIEW OF DOOROLIVER WAST WATER TREATMENT THICKENER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

52. NORTHEASTERN EXTERIOR VIEW OF DOOR-OLIVER WAST WATER TREATMENT THICKENER No. 1. ELECTRIC POWERHOUSE No. 2 AND BLOW ENGINE HOUSE No. 3 IS IN THE BACKGROUND. (Jet Lowe) - U.S. Steel Duquesne Works, Blast Furnace Plant, Along Monongahela River, Duquesne, Allegheny County, PA

162

EXTERIOR VIEW, NO. 3 CAST HOUSE CENTER AND BLAST FURNACE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR VIEW, NO. 3 CAST HOUSE CENTER AND BLAST FURNACE NO. 3 (JANE FURNACE)/ORE BRIDGE TO THE RIGHT, WITH SINTERING PLANT CONVEYORS & TRANSFER HOUSE IN FOREGROUND. - Pittsburgh Steel Company, Monessen Works, Blast Furnace No. 3, Donner Avenue, Monessen, Westmoreland County, PA

163

7. EXTERIOR OF FRONT (WEST END) AND NORTH SIDE SHOWING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. EXTERIOR OF FRONT (WEST END) AND NORTH SIDE SHOWING PROJECTED PURLINS AND EXPOSED RAFTER UNDER THE EAVES, AND SATELLITE TELEVISION DISH ON NORTH SIDE OF HOUSE. VIEW TO SOUTHEAST. - Bishop Creek Hydroelectric System, Plant 4, Worker Cottage, Bishop Creek, Bishop, Inyo County, CA

164

Exterior oblique view of the north end and the east ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior oblique view of the north end and the east side. Facility 167 is to the left and Facility 155 to the right. View facing west southwest - U.S. Naval Base, Pearl Harbor, Monterey Storehouse Building No. 66, Avenue D, opposite Facility No. 167 & adjacent to Facility No. 71, Pearl City, Honolulu County, HI

165

Exterior oblique view of the south end and the west ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior oblique view of the south end and the west side. Facility 71 is to the left. View facing northeast - U.S. Naval Base, Pearl Harbor, Monterey Storehouse Building No. 66, Avenue D, opposite Facility No. 167 & adjacent to Facility No. 71, Pearl City, Honolulu County, HI

166

Exterior oblique view of the north and west sides, Facility ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior oblique view of the north and west sides, Facility No. 7 is on the right - U.S. Naval Base, Pearl Harbor, Paint & Oil Storage, Near intersection of Avenue E & Seventh Street, adjacent to Facility Nos. 3A & 56, Pearl City, Honolulu County, HI

167

Exterior oblique view of the east and south sides, taken ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior oblique view of the east and south sides, taken from the roadway on the east side, Facility No. 3A is on the left - U.S. Naval Base, Pearl Harbor, Paint & Oil Storage, Near intersection of Avenue E & Seventh Street, adjacent to Facility Nos. 3A & 56, Pearl City, Honolulu County, HI

168

Exterior oblique view of the east and north sides ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior oblique view of the east and north sides - U.S. Naval Base, Pearl Harbor, Marine Railway No. 2 Machine House & Substation, Near intersection of Avenue G & Third Street, northwest of Dry Dock No. 3, Pearl City, Honolulu County, HI

169

Exterior oblique view of the south and west sides ...  

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Exterior oblique view of the south and west sides - U.S. Naval Base, Pearl Harbor, Marine Railway No. 2 Machine House & Substation, Near intersection of Avenue G & Third Street, northwest of Dry Dock No. 3, Pearl City, Honolulu County, HI

170

Exterior oblique view of the north and west sides ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior oblique view of the north and west sides - U.S. Naval Base, Pearl Harbor, Marine Railway No. 2 Machine House & Substation, Near intersection of Avenue G & Third Street, northwest of Dry Dock No. 3, Pearl City, Honolulu County, HI

171

EXTERIOR VIEW, LOOKING SOUTH, SIDE AND FRONT FACADES OF THE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR VIEW, LOOKING SOUTH, SIDE AND FRONT FACADES OF THE RESIDENCE CONSTRUCTED FOR DON BACON, PRESIDENT OF TENNESSEE COAL AND IRON COMPANY (TCI), THE FORERUNNER OF BIRMINGHAM'S US STEEL SUBSIDIARY. - Tennessee Coal & Iron Company, President's House, 1405 Minnesota Avenue, Bessemer, Jefferson County, AL

172

52. Exterior view of yard at marine railway #2. Not ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

52. Exterior view of yard at marine railway #2. Not rail/roller type (wood beam with steel plate rail on sled/roller railway). Steel fabrication building and traveling crane in background. - Barbour Boat Works, Tryon Palace Drive, New Bern, Craven County, NC

173

9. EXTERIOR OF ENCLOSED PORTION OF SECOND FLOOR WEST SIDE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. EXTERIOR OF ENCLOSED PORTION OF SECOND FLOOR WEST SIDE APARTMENT ENTRYWAY SHOWING STAIR LANDING AND OPEN FRONT DOOR FLANKED BY PAIRED 4-LIGHT OVER 4-LIGHT DOUBLE-HUNG, WOOD-FRAME WINDOWS. VIEW TO NORTHEAST. - Lee Vining Creek Hydroelectric System, Triplex Cottage, Lee Vining Creek, Lee Vining, Mono County, CA

174

Exterior view of Irving Powerhouse. Through door on left the ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior view of Irving Powerhouse. Through door on left the water wheel is visible. Water is exiting the Powerhouse on the left, under the door, into the Tailrace. Looking north - Childs-Irving Hydroelectric Project, Irving System, Irving Powerhouse, Forest Service Road 708/502, Camp Verde, Yavapai County, AZ

175

1. WEST END EXTERIOR OF KERN RIVER No. 1 POWERHOUSE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. WEST END EXTERIOR OF KERN RIVER No. 1 POWERHOUSE BUILDING SHOWING SWITCHRACKS ON SOUTH SIDE AND PACIFIC GAS AND ELECTRIC COMPANY KERN RIVER CANYON POWERHOUSE FOREBAY STRUCTURE IN FOREGROUND. KERN RIVER NO. 1 FOREBAY OVERFLOW PIPE IS VISIBLE ABOVE POWERHOUSE. VIEW TO NORTHEAST. - Kern County No. 1 Hydroelectric System, Powerhouse Exciters, Kern River Canyon, Bakersfield, Kern County, CA

176

11. DETAIL EXTERIOR VIEW OF EQUIPMENT AND FISH LIFTS BETWEEN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

11. DETAIL EXTERIOR VIEW OF EQUIPMENT AND FISH LIFTS BETWEEN POWERHOUSE #1 AND NAVIGATION LOCK #1; VIEW IS TAKEN FROM ROOF OF POWERHOUSE #1. - Bonneville Project, Navigation Lock No. 1, Oregon shore of Columbia River near first Powerhouse, Bonneville, Multnomah County, OR

177

8. GENERAL EXTERIOR VIEW LOOKING EAST, SHOWING THE DOWNSTREAM FACE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. GENERAL EXTERIOR VIEW LOOKING EAST, SHOWING THE DOWNSTREAM FACE OF THE SOUTH END OF POWERHOUSE #1; SWITCHING EQUIPMENT IS ON TOP, MAIN SECTION OF POWERHOUSE #1 IS IN CENTER, AND OUTLET PIERS ARE ON BOTTOM; WATER IN OUTLET CHANNEL IS IN FOREGROUND. - Bonneville Project, Powerhouse No.1, Spanning Bradford Slough, from Bradford Island, Bonneville, Multnomah County, OR

178

4. NORTH EXTERIOR SIDE OF KERN RIVER No. 1 POWERHOUSE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. NORTH EXTERIOR SIDE OF KERN RIVER No. 1 POWERHOUSE BUILDING SHOWING TAILRACES FOR (LEFT TO RIGHT IN PHOTO) GENERATOR UNITS Nos. 4 AND 3, EXCITER No. 1, AND GENERATOR UNITS Nos. 2 AND 1. POWERHOUSE BUILDING NORTH EXIT DOOR IS IN CENTER OF WALL. VIEW TO SOUTHWEST. - Kern County No. 1 Hydroelectric System, Powerhouse Exciters, Kern River Canyon, Bakersfield, Kern County, CA

179

View of the exterior of Irving Powerhouse showing the main ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

View of the exterior of Irving Powerhouse showing the main entrance on the west side, office building in the left foreground. Looking southeast - Childs-Irving Hydroelectric Project, Irving System, Irving Powerhouse, Forest Service Road 708/502, Camp Verde, Yavapai County, AZ

180

6. FACING NORTHWEST. EXTERIOR OF WHITEPAINTED 1859 BRICK PICKER HOUSE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. FACING NORTHWEST. EXTERIOR OF WHITE-PAINTED 1859 BRICK PICKER HOUSE WITH MILL NO. 1 IN BACKGROUND. PARK FOUNTAIN IN FOREGROUND WITH BUST OF DANIEL PRATT BY ARTIST TOMMY BROWN. - Prattville Manufacturing Company, Number One, 242 South Court Street, Prattville, Autauga County, AL

181

EXTERIOR VIEW, LOOKING SOUTHEAST, WITH FRONT AND SIDE ELEVATIONS OF ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR VIEW, LOOKING SOUTHEAST, WITH FRONT AND SIDE ELEVATIONS OF THIS FORMER TCI-US STEEL COMPANY CHURCH FOR BLACK RED ORE MINERS AND THEIR FAMILIES. - Tennessee Coal & Iron Company Church, State Route 150 at Morgan Road, Bessemer, Jefferson County, AL

182

EXTERIOR PERSPECTIVE OF GRANARY WITH DRIVE, LOOKING SOUTH. (In compliance ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR PERSPECTIVE OF GRANARY WITH DRIVE, LOOKING SOUTH. (In compliance with the Secretary of the Interior?s Standards, the main façade of the granary was left unaltered in 1998, when the Smith family converted the granary into a family home.) - Smith Farm, Granary, 399 Ebey Road, Coupeville, Island County, WA

183

5. Photocopy of old exterior photo showing Western Saving Fund ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. Photocopy of old exterior photo showing Western Saving Fund Society before the addition of ca. 1910 building. Original photo, late 19th century, is at the Philadelphia Free Library, Philadelphia Collection, Print and Picture Department. - Western Saving Fund Society of Philadelphia, 1000-1008 Walnut Street, Philadelphia, Philadelphia County, PA

184

1. EXTERIOR VIEW, LOOKING SOUTH, WITH SIDE FACADE AND ENTRANCE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW, LOOKING SOUTH, WITH SIDE FACADE AND ENTRANCE TO THE FORMER TCI-US STEEL COMPANY BATHHOUSE FOR COLORED ORE MINERS. - Tennessee Coal & Iron-U.S. Steel Surface Plant, Company Bathhouse for Black Ore Miners, East of State Route 150 on South slope of Red Mountain, Bessemer, Jefferson County, AL

185

1. EXTERIOR VIEW, LOOKING WEST WITH FRONT FACADE AND ENTRANCE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW, LOOKING WEST WITH FRONT FACADE AND ENTRANCE TO FORMER TCI-US STEEL COMPANY BATHHOUSE FOR WHITE ORE MINERS. - Tennessee Coal & Iron-U.S. Steel Surface Plant, Company Bathhouse for White Ore Miners, East of State Route 150 on South slope of Red Mountain, Bessemer, Jefferson County, AL

186

8. EXTERIOR OF ENCLOSED PORTION OF SECOND FLOOR WEST SIDE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

8. EXTERIOR OF ENCLOSED PORTION OF SECOND FLOOR WEST SIDE APARTMENT ENTRANCE. SIDE HUNG CASEMENT WINDOWS AT PHOTO LEFT OPEN TO FIRST FLOOR APARTMENT KITCHEN AND PANTRY. VIEW TO SOUTHWEST. - Lee Vining Creek Hydroelectric System, Triplex Cottage, Lee Vining Creek, Lee Vining, Mono County, CA

187

GARAGE EXTERIOR EAST SIDE AND REAR SHOWING PIER SUPPORTS UNDER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

GARAGE EXTERIOR EAST SIDE AND REAR SHOWING PIER SUPPORTS UNDER SHED-ROOFED REAR STORAGE COMPARTMENT, ASBESTOS SIDING OVER ORIGINAL WOOD SIDING, AND SINGLE CASEMENT WINDOW OVER REAR STORAGE COMPARTMENT. VIEW TO NORTHWEST - Big Creek Hydroelectric System, Big Creek Town, Operator House Garage, Orchard Avenue south of Huntington Lake Road, Big Creek, Fresno County, CA

188

5. HOUSE NORTH END EXTERIOR SHOWING ASBESTOS SIDING, CONCRETE WALKWAY ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. HOUSE NORTH END EXTERIOR SHOWING ASBESTOS SIDING, CONCRETE WALKWAY TO REAR OF HOUSE, CLOSELINE SUPPORT AT EXTREME PHOTO RIGHT, AND CASEMENT WINDOW TO ATTIC JUST BELOW THE GABLE PEAK. VIEW TO SOUTHWEST. - Big Creek Hydroelectric System, Big Creek Town, Operator House, Orchard Avenue south of Huntington Lake Road, Big Creek, Fresno County, CA

189

5. EXTERIOR OF SOUTH END OF HOUSE SHOWING OPEN DOOR ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. EXTERIOR OF SOUTH END OF HOUSE SHOWING OPEN DOOR TO BASEMENT BELOW KITCHEN, ORIGINAL PAIRED WOODFRAMED SLIDING-GLASS WINDOWS ON KITCHEN WALL AND 1LIGHT OVER 1-LIGHT DOUBLE-HUNG WINDOW ON STORM PORCH ADDITION. VIEW TO WEST. - Rush Creek Hydroelectric System, Clubhouse Cottage, Rush Creek, June Lake, Mono County, CA

190

4. EXTERIOR OF SOUTH END OF BUILDING 108 SHOWING STORM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. EXTERIOR OF SOUTH END OF BUILDING 108 SHOWING STORM PORCH ADDITION AND WINDOWS ALONG BACK (WEST SIDE) OF HOUSE. NOTE ORIGNAL SHORT CHIMNEY AT CREST OF ROOF. VIEW TO NORTH. - Rush Creek Hydroelectric System, Clubhouse Cottage, Rush Creek, June Lake, Mono County, CA

191

Exterior direct view of (nonoriginal), solar heating panels, and top ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior direct view of (non-original), solar heating panels, and top of typical rectangular trash-dump tower at roof of Building 6, looking north - North Beach Place, 401 Bay Street, 500 Francisco Street, 401 Bay Street, 500 Francisco Street, San Francisco, San Francisco County, CA

192

EXTERIOR VIEW OF COVERED OPEN WALKWAY, LOOKING SOUTHWEST AT BUILDING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR VIEW OF COVERED OPEN WALKWAY, LOOKING SOUTHWEST AT BUILDING T-10125 (LEFT) & BUILDING T-10124 (RIGHT) - Fort McCoy, Building No. T-10602, South & North Sides of South Eighth Avenue, Connecting Buildings T-10124, T-10125, T-10126; & Northeast Side of Building T-10106, Block 10, Sparta, Monroe County, WI

193

6. SOUTH EXTERIOR SIDE SHOWING TRIANGULAR KNEE BRACE SUPPORTS AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

6. SOUTH EXTERIOR SIDE SHOWING TRIANGULAR KNEE BRACE SUPPORTS AND ENCLOSED PORCH SCREENED WINDOWS. ON BASIC FLOOR-PLAN FOR THE SIX-ROOM HOUSE THIS END WAS THE FRONT ENTRANCE. VIEW TO NORTH. - Big Creek Hydroelectric System, Powerhouse 8, Operator Cottage, Big Creek, Big Creek, Fresno County, CA

194

1. EXTERIOR VIEW OF 606 LINCOLN STREET, A ONEANDAHALFSTORY CRAFTSMANSTYLE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW OF 606 LINCOLN STREET, A ONE-AND-A-HALF-STORY CRAFTSMAN-STYLE BUNGALOW. THIS STRUCTURE WAS BUILT AS HOUSING FOR AN OVERSEER OR MANAGER AT THE HILLSIDE COTTON MILL (1914-15). HILLSIDE WAS BUILT BY THE CALLAWAY MILLS IN SOUTHWEST LaGRANGE. - 606 Lincoln Street (House), 606 Lincoln Street, La Grange, Troup County, GA

195

VIEW OF STATION LEARY FACING NORTHWEST, SHOWING EXPOSED EXTERIOR FRONT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW OF STATION LEARY FACING NORTHWEST, SHOWING EXPOSED EXTERIOR FRONT AND LEFT SIDE OF THE CONCRETE CONCEALMENT, SANDSTONE FLANKWALL IS VISIBLE AT LEFT REAR - White's Point Reservation, Base End Stations, B"3, Bounded by Voyager Circle & Mariner Drive, San Pedro, Los Angeles County, CA

196

2. VIEW OF STATION FARLEY FACING NORTH SHOWING EXPOSED EXTERIOR ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. VIEW OF STATION FARLEY FACING NORTH SHOWING EXPOSED EXTERIOR FRONT OF THE CONCRETE CONCEALMENT, SANDSTONE FLANK-WALLS ARE VISIBLE AT REAR SIDES. - White's Point Reservation, Base End Stations, B"6, Bounded by Voyager Circle & Mariner Drive, San Pedro, Los Angeles County, CA

197

VIEW OF STATION SAXTON FACING NORTH SHOWING EXPOSED EXTERIOR FRONT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW OF STATION SAXTON FACING NORTH SHOWING EXPOSED EXTERIOR FRONT OF THE CONCRETE CONCEALMENT, SANDSTONE FLANK-WALLS ARE VISIBLE AT REAR SIDES - White's Point Reservation, Base End Stations, B"2, Bounded by Voyager Circle & Mariner Drive, San Pedro, Los Angeles County, CA

198

VIEW OF STATION OSGOOD FACING NORTH SHOWING EXPOSED EXTERIOR FRONT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW OF STATION OSGOOD FACING NORTH SHOWING EXPOSED EXTERIOR FRONT OF THE CONCRETE CONCEALMENT INCLUDING POST 1920 DOORWAY ALTERATIONS, SANDSTONE FLANK-WALLS ARE VISIBLE AT REAR SIDES - White's Point Reservation, Base End Stations, B"5, Bounded by Voyager Circle & Mariner Drive, San Pedro, Los Angeles County, CA

199

3. VIEW OF STATION PARLEY FACING NORTHWEST, SHOWING EXPOSED EXTERIOR ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. VIEW OF STATION PARLEY FACING NORTHWEST, SHOWING EXPOSED EXTERIOR FRONT AND LEFT SIDE OF THE CONCRETE CONCEALMENT, SANDSTONE FLANKWALL IS VISIBLE AT LEFT REAR. - White's Point Reservation, Base End Stations, B"6, Bounded by Voyager Circle & Mariner Drive, San Pedro, Los Angeles County, CA

200

VIEW OF STATION OSGOOD FACING NORTHWEST, SHOWING EXPOSED EXTERIOR FRONT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW OF STATION OSGOOD FACING NORTHWEST, SHOWING EXPOSED EXTERIOR FRONT AND LEFT SIDE OF THE CONCRETE CONCEALMENT, SANDSTONE FLANKWALL IS VISIBLE AT LEFT REAR - White's Point Reservation, Base End Stations, B"5, Bounded by Voyager Circle & Mariner Drive, San Pedro, Los Angeles County, CA

201

VIEW OF STATION LEARY FACING NORTH SHOWING EXPOSED EXTERIOR FRONT ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW OF STATION LEARY FACING NORTH SHOWING EXPOSED EXTERIOR FRONT OF THE CONCRETE CONCEALMENT INCLUDING POST 1920 DOORWAY ALTERATIONS, SANDSTONE FLANK-WALLS ARE VISIBLE AT REAR SIDES - White's Point Reservation, Base End Stations, B"3, Bounded by Voyager Circle & Mariner Drive, San Pedro, Los Angeles County, CA

202

1. Historic American Buildings Survey Photographer Unknown, post 1907. EXTERIOR ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. Historic American Buildings Survey Photographer Unknown, post 1907. EXTERIOR FROM WEST Copied from print in files of National Capital Region, National Park Service, Washington, D. C. - Godey Lime Kilns (Ruins), Junction of Rock Creek & Potomac Parkway, Washington, District of Columbia, DC

203

Exterior, looking west, Equipment Building to left, Tower at center, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior, looking west, Equipment Building to left, Tower at center, Civil Engineering Storage Building (Building 5765) at left - Beale Air Force Base, Perimeter Acquisition Vehicle Entry Phased-Array Warning System, Microwave Equipment Building, End of Spencer Paul Road, north of Warren Shingle Road (14th Street), Marysville, Yuba County, CA

204

Exterior with Technical Equipment Building (Building 5760) in background left, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior with Technical Equipment Building (Building 5760) in background left, looking west - Beale Air Force Base, Perimeter Acquisition Vehicle Entry Phased-Array Warning System, Power Plant, End of Spencer Paul Road, north of Warren Shingle Road (14th Street), Marysville, Yuba County, CA

205

Exterior, looking northwest towards Main Gate, Gate House on left, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior, looking northwest towards Main Gate, Gate House on left, Technical Equipment Building (Building 5760) in background to right - Beale Air Force Base, Perimeter Acquisition Vehicle Entry Phased-Array Warning System, Gate House, End of Spencer Paul Road, north of Warren Shingle Road (14th Street), Marysville, Yuba County, CA

206

EXTERIOR VIEW, LOOKING WEST, WITH SWITCHING ENGINE TRANSPORTING TORPEDO LADLE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR VIEW, LOOKING WEST, WITH SWITCHING ENGINE TRANSPORTING TORPEDO LADLE FILLED WITH MOLTEN IRON TO THE Q-BOP FURNACES. VERTICAL CONVEYOR TRANSPORTS ALL PROCESS MATERIAL INCLUDING COKE AND PELLETS TO FURNACE. - U.S. Steel, Fairfield Works, Blast Furnace No. 8, North of Valley Road, West of Ensley-Pleasant Grove Road, Fairfield, Jefferson County, AL

207

4. EXTERIOR NORTH SIDE OF BUILDING 102 SHOWING USHAPED SPACE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. EXTERIOR NORTH SIDE OF BUILDING 102 SHOWING U-SHAPED SPACE BETWEEN KITCHEN NOS. 1 AND 2, SHED-ROOFED EXTENSION TO UTILITY ROOM CONTAINING HOT WATER HEATER, AND ASBESTOS SIDING. VIEW TO SOUTHWEST. - Bishop Creek Hydroelectric System, Plant 6, Cashbaugh-Kilpatrick House, Bishop Creek, Bishop, Inyo County, CA

208

4. EXTERIOR DETAIL OF FRONT PORCH SHOWING ASBESTOS SIDING, SOFFITED ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. EXTERIOR DETAIL OF FRONT PORCH SHOWING ASBESTOS SIDING, SOFFITED BOXED CORNICE, SQUARE POST PORCH SUPPORT, AND STICK BALASTRADE WITH CRIS-CROSSED MEMBERS. VIEW TO NORTH. - Bishop Creek Hydroelectric System, Plant 4, Worker Cottage, Bishop Creek, Bishop, Inyo County, CA

209

9. EXTERIOR VIEW OF BALTIMORE FAN HOUSE LOOKING NORTHEAST The ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. EXTERIOR VIEW OF BALTIMORE FAN HOUSE LOOKING NORTHEAST The brick and concrete construction of the engine room, airways, and chimney are evident. The shaft housing and flywheel of the Allis- Chalmers Corliss steam engine are visible through the window of the engine room. - Dorrance Colliery Fan Complex, South side of Susquehanna River at Route 115 & Riechard Street, Wilkes-Barre, Luzerne County, PA

210

DISTANT VIEW OF EXTERIOR OD UPPER (NORTHERN) LOCK GATES, WITH ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

DISTANT VIEW OF EXTERIOR OD UPPER (NORTHERN) LOCK GATES, WITH TIMBER GUIDE WALL AND CONTROL HOUSE ON RIGHT AND TIMBER PYLONS AND LEVEE ON LEFT, BAFFLES ARE IN FRONT OF GATES FOR THE DRAINING OF THE LOCK, VIEW TOWARDS SOUTH - Moore Haven Lock, Hurricane Gate No. 1, Cross-State Canal, Okeechobee Intracoastal Waterway, Moore Haven, Glades County, FL

211

3. Historic American Buildings Survey UNDATED EXTERIOR SHOWING NORTH AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. Historic American Buildings Survey UNDATED EXTERIOR SHOWING NORTH AND EAST FACADES (View B) This view shows clapboards on gable end and therefore, predates View A which shows shingles in upper gable From the collection of Mrs. L. T. Hazall, descendent of Rev. Woodward - Reverend John Woodward House, 409 Forbes Avenue, New Haven, New Haven County, CT

212

General exterior view showing remnants of loading dock at three ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

General exterior view showing remnants of loading dock at three main doors, view to north - Charlestown Navy Yard, Oxygen Plant, Midway along northern boundary of Charlestown Navy Yard, on Little Mystic Channel, near junction of Eighteenth Street & Fourth Avenue, Boston, Suffolk County, MA

213

1. EXTERIOR VIEW, LOOKING WEST, OF CAST IRON FENCE AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW, LOOKING WEST, OF CAST IRON FENCE AND MARBLE MONUMENTS IN THIS GRAVE PLOT IN THE COLUMBIANA CEMETERY WHICH DATE TO 1864. IRON WORK MANUFACTURED AT SHELBY IRONWORKS FOR IRONMASTER'S FIRST WIFE AND DAUGHTER'S GRAVES. - Ware Cemetery Plot, Shelby County Road 25, Columbiana, Shelby County, AL

214

1. EXTERIOR VIEW OF FRONT OF CLUB HOUSE. BOAT HOUSE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW OF FRONT OF CLUB HOUSE. BOAT HOUSE AND DOCK TO THE RIGHT. PICTURE TAKEN FROM FRONT YARD OF COTTAGE 231, CAMERA FACING SOUTHWEST. SMALL WOOD FRAME SHED IN FRONT OF CLUB HOUSE STORES FIRE HOSE BUILT AFTER 1980. - Swan Falls Village, Clubhouse 011, Snake River, Kuna, Ada County, ID

215

Exterior view, westsouthwest, of Jeudevine Memorial Library. Built 18961897 and ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior view, west-southwest, of Jeudevine Memorial Library. Built 1896-1897 and designed by local architect Lambert Packard, the library is an excellent example of Richardsonian Romanesque architecture. - Jeudevine Memorial Library, 93 North Main Street, Hardwick, Caledonia County, VT

216

Exterior and interior detail of front entry, east side, facing ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior and interior detail of front entry, east side, facing west-northwest; with lancet arched door frame stairs to choir robing loft, and stained glass windows. - Mare Island Naval Shipyard, St. Peter's Chapel, Walnut Street & Cedar Parkway, Vallejo, Solano County, CA

217

1. EXTERIOR VIEW OF HILLSIDE PLANT FROM INTERSECTION OF LINCOLN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW OF HILLSIDE PLANT FROM INTERSECTION OF LINCOLN STREET AND 2ND AVENUE. HILLSIDE PLANT WAS BUILT AS CALLAWAY MILLS HILLSIDE COTTON MILL (PARK A. DALLIS, 1914-15). THIS TWO-STORY SECTION WAS BUILT AS A WEAVE SHED. - Hillside Cotton Mill, 1300 Brownwood Avenue, La Grange, Troup County, GA

218

5. EXTERIOR VIEW TO THE SOUTHEAST OF THE NORTH AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. EXTERIOR VIEW TO THE SOUTHEAST OF THE NORTH AND WEST ELEVATIONS, WITH THE COLD ASSEMBLY AREA TO THE RIGHT AND THE HOT DISASSEMBLY AREA TO THE LEFT. - Nevada Test Site, Reactor Maintenance Assembly & Dissassembly Facility, Area 25, Jackass Flats, Junction of Roads F & G, Mercury, Nye County, NV

219

1. EXTERIOR VIEW TO THE NORTH OF THE SOUTH ELEVATIONS ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW TO THE NORTH OF THE SOUTH ELEVATIONS OF THE R-MAD FACILITY WITH THE COLD ASSEMBLY AREA ON THE LEFT AND THE HOT DISASSEMBLY AREA TO THE RIGHT. - Nevada Test Site, Reactor Maintenance Assembly & Dissassembly Facility, Area 25, Jackass Flats, Junction of Roads F & G, Mercury, Nye County, NV

220

3. EXTERIOR VIEW TO THE NORTH OF THE SOUTH ELEVATION ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. EXTERIOR VIEW TO THE NORTH OF THE SOUTH ELEVATION OF THE ADMINISTRATION AREA IN THE COLD ASSEMBLY AREA, WITH THE MAIN ENTRANCE 'KENNEDY DOORS' IN THE MIDDLE. - Nevada Test Site, Reactor Maintenance Assembly & Dissassembly Facility, Area 25, Jackass Flats, Junction of Roads F & G, Mercury, Nye County, NV

221

19. VIEW TO THE NORTH FROM THE EXTERIOR INTO THE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

19. VIEW TO THE NORTH FROM THE EXTERIOR INTO THE INTERIOR OF ROOM 105, THE BOILER ROOM FOR THE BUILDING. - Nevada Test Site, Reactor Maintenance Assembly & Dissassembly Facility, Area 25, Jackass Flats, Junction of Roads F & G, Mercury, Nye County, NV

222

EXTERIOR VIEW, THE SA WETSIDE BUILDING (ALSO KNOWN AS DISTILLATION ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR VIEW, THE SA WETSIDE BUILDING (ALSO KNOWN AS DISTILLATION BUILDING OR SOLVAY TOWERS BUILDING) THE HEART OF THE SOLVAY PROCESS. VIEW LOOKING EAST. THIS BUILDING WAS BUILT IN 1954 TO REPLACE A SIMILAR STRUCTURE BUILT CIRCA 1907. - Solvay Process Company, SA Wetside Building, Between Willis & Milton Avenue, Solvay, Onondaga County, NY

223

42. EXTERIOR, DETAIL VIEW OF SLATE SHINGLES ON ROOF AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

42. EXTERIOR, DETAIL VIEW OF SLATE SHINGLES ON ROOF AND JIG-SAWED FRET WORK SKIRTING FROM THE INSIDE OF THE TEXAS DECK (PORCH) - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

224

24 CFR 3285.801 - Exterior close-up.  

Code of Federal Regulations, 2013 CFR

...Mate-line gasket. The home manufacturer must provide materials and designs for mate-line gaskets or other methods designed to resist the entry of air, water, water vapor, insects, and rodents at all mate-line locations exposed to the exterior (see...

2013-04-01

225

3. Exterior view of perimeter fence, view towards east ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. Exterior view of perimeter fence, view towards east - Ellsworth Air Force Base, Delta Flight, Launch Facility D-6, 4 miles north of Badlands National Park Headquarters, 4.5 miles east of Jackson County line on county road, Interior, Jackson County, SD

226

5. EXTERIOR OF TRIPLEX COTTAGE ROOF SHOWING MANVILLE COMPOSITION SHINGLES, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. EXTERIOR OF TRIPLEX COTTAGE ROOF SHOWING MANVILLE COMPOSITION SHINGLES, POURED CONCRETE CHIMNEYS, AND TRANSLUCENT PLASTIC COVERING OVER WALKWAY AT REAR OF HOUSE (PHOTO LEFT). VIEW TO NORTHWEST. - Lee Vining Creek Hydroelectric System, Triplex Cottage, Lee Vining Creek, Lee Vining, Mono County, CA

227

Oblique exterior view of east end and north side, top ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Oblique exterior view of east end and north side, top just visible over bike storage shed, view facing west-southwest - U.S. Naval Base, Pearl Harbor, Prefabricated, Splinterproof Personnel Shelter, Avenue C, near Seventh Street intersection, adjacent to Facility No. 155, Pearl City, Honolulu County, HI

228

30. EXTERIOR VIEW LOOKING INTO THE THIRD TAILRACE (COUNTING FROM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

30. EXTERIOR VIEW LOOKING INTO THE THIRD TAILRACE (COUNTING FROM THE DOWNSTREAM END TO THE UPSTREAM END SOUTHEAST TO NORTHWEST). NOTE THE STEEL BULKHEAD OF THE FLUME AND THE DRAFT TUBE EXTENDING BENEATH THE SILT DEPOSITS AND WATER LINE. - Potomac Power Plant, On West Virginia Shore of Potomac River, about 1 mile upriver from confluence with Shenandoah River, Harpers Ferry, Jefferson County, WV

229

28. EXTERIOR VIEW LOOKING INTO THE SECOND TAILRACE (COUNTING FROM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

28. EXTERIOR VIEW LOOKING INTO THE SECOND TAILRACE (COUNTING FROM THE DOWNSTREAM END TO THE UPSTREAM END SOUTHEAST TO NORTHWEST). NOTE THE STEEL BULKHEAD OF THE FLUME AND THE DRAFT TUBE EXTENDING BENEATH THE SILT DEPOSITS. - Potomac Power Plant, On West Virginia Shore of Potomac River, about 1 mile upriver from confluence with Shenandoah River, Harpers Ferry, Jefferson County, WV

230

27. EXTERIOR VIEW LOOKING INTO THE FIRST TAILRACE (COUNTING FROM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

27. EXTERIOR VIEW LOOKING INTO THE FIRST TAILRACE (COUNTING FROM THE DOWNSTREAM END TO THE UPSTREAM END SOUTHEAST TO NORTHWEST). - Potomac Power Plant, On West Virginia Shore of Potomac River, about 1 mile upriver from confluence with Shenandoah River, Harpers Ferry, Jefferson County, WV

231

ARCHITECTURAL EXTERIOR ELEVATIONS AND DETAILS, WELLTONMOHAWK PUMPING PLANT NO. 1. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

ARCHITECTURAL EXTERIOR ELEVATIONS AND DETAILS, WELLTON-MOHAWK PUMPING PLANT NO. 1. United States Department of the Interior, Bureau of Reclamation; Gila Project, Arizona, Wellton-Mohawk Division. Drawing No. 50-D-2359, dated November 24, 1948, Denver, Colorado. - Wellton-Mohawk Irrigation System, Pumping Plant No. 1, Bounded by Gila River & Union Pacific Railroad, Wellton, Yuma County, AZ

232

116. CLOSER VIEW OF THE SOUTH ELEVATION (BOILER HOUSE EXTERIOR) ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

116. CLOSER VIEW OF THE SOUTH ELEVATION (BOILER HOUSE EXTERIOR) AND COAL TOWER No. 2 LOOKING FROM THE SOUTHWEST (DUPLICATE OF HAER No. PA-505-6) - Delaware County Electric Company, Chester Station, Delaware River at South end of Ward Street, Chester, Delaware County, PA

233

1. EXTERIOR OVERVIEW SHOWING BISHOP CREEK PLANT 4 RESIDENTIAL COMPLEX. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR OVERVIEW SHOWING BISHOP CREEK PLANT 4 RESIDENTIAL COMPLEX. BUILDING 113 IS VISIBLE AT RIGHT PHOTO CENTER. PLANT 5 INTAKE DAM AT PHOTO LEFT. VIEW TO WEST. - Bishop Creek Hydroelectric System, Plant 4, Worker Cottage, Bishop Creek, Bishop, Inyo County, CA

234

1. EXTERIOR OVERVIEW SHOWING BISHOP CREEK PLANT 4 RESIDENTIAL COMPLEX. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR OVERVIEW SHOWING BISHOP CREEK PLANT 4 RESIDENTIAL COMPLEX. BUILDING 122 IS VISIBLE AT PHOTO CENTER. PLANT 5 INTAKE DAM AT PHOTO LEFT. VIEW TO WEST. - Bishop Creek Hydroelectric System, Plant 4, Worker Cottage, Bishop Creek, Bishop, Inyo County, CA

235

1. EXTERIOR OVERVIEW OF SOUTH END OF RUSH CREEK POWERHOUSE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR OVERVIEW OF SOUTH END OF RUSH CREEK POWERHOUSE RESIDENTIAL COMPLEX SHOWING THE RUSH CREEK POWERHOUSE AT PHOTO RIGHT (TAILRACE IN FOREGROUND), BUILDING 106 NEXT TO THE POWERHOUSE AT PHOTO LEFT CENTER, AND BUILDING 103 AT UPPER PHOTO LEFT ABOVE AND BEHIND BUILDING 106. VIEW TO SOUTH. - Rush Creek Hydroelectric System, Worker Cottage, Rush Creek, June Lake, Mono County, CA

236

1. EXTERIOR OVERVIEW SHOWING BISHOP CREEK PLANT 4 RESIDENTIAL COMPLEX. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR OVERVIEW SHOWING BISHOP CREEK PLANT 4 RESIDENTIAL COMPLEX. ROOF OF BUILDING 105 IS VISIBLE IN UPPER PHOTO CENTER. PLANT 5 INTAKE DAM AT PHOTO LEFT. VIEW TO WEST. - Bishop Creek Hydroelectric System, Plant 4, Worker Cottage, Bishop Creek, Bishop, Inyo County, CA

237

1. EXTERIOR OVERVIEW OF NORTH END OF RUSH CREEK POWERHOUSE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR OVERVIEW OF NORTH END OF RUSH CREEK POWERHOUSE RESIDENTIAL COMPLEX SHOWING BUILDING 108 AT PHOTO RIGHT AND BUILDING 105 AT PHOTO CENTER BEHIND SWITCHRACKS AND TREE. POWERHOUSE IS AT EXTREME PHOTO LEFT. VIEW TO WEST. - Rush Creek Hydroelectric System, Worker Cottage, Rush Creek, June Lake, Mono County, CA

238

1. EXTERIOR OVERVIEW OF NORTH END OF RUSH CREEK POWERHOUSE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR OVERVIEW OF NORTH END OF RUSH CREEK POWERHOUSE RESIDENTIAL COMPLEX SHOWING BUILDING 108 AT PHOTO RIGHT AND BUILDING 105 AT PHOTO CENTER BEHIND TREE. RUSH CREEK POWERHOUSE IS PARTIALLY VISIBLE AT EXTREME PHOTO LEFT). VIEW TO WEST. - Rush Creek Hydroelectric System, Clubhouse Cottage, Rush Creek, June Lake, Mono County, CA

239

16. EXTERIOR NORTH END OF TULE RIVER POWERHOUSE SHOWING POWERHOUSE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

16. EXTERIOR NORTH END OF TULE RIVER POWERHOUSE SHOWING POWERHOUSE AT PHOTO CENTER, SUBSTATION AT PHOTO RIGHT FOREGROUND, OFFICE BEHIND SUBSTATION AT RIGHT OF POWERHOUSE, AND MACHINE SHOP AT LEFT OF POWERHOUSE. THIS PHOTOGRAPH DUPLICATES HISTORIC VIEW SHOWN IN PHOTO CA-216-17. VIEW TO SOUTHEAST. - Tule River Hydroelectric Project, Water Conveyance System, Middle Fork Tule River, Springville, Tulare County, CA

240

1. EXTERIOR VIEW, LOOKING SOUTHEAST, SHOWING FLIGHT TEST HANGARS IN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW, LOOKING SOUTHEAST, SHOWING FLIGHT TEST HANGARS IN CENTER, BUILDING 7 ON LEFT, AND BUILDING 8 ON RIGHT. - Wright-Patterson Air Force Base, Area B, Building 1/9, Flight Test Hangars, On flightline between Ninth & Tenth Streets, Dayton, Montgomery County, OH

241

13. EXTERIOR VIEW OF OLD TENFOOT WIND TUNNEL (1991). ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

13. EXTERIOR VIEW OF OLD TEN-FOOT WIND TUNNEL (1991). - Wright-Patterson Air Force Base, Area B, Buildings 25 & 24,10-foot & 20-foot Wind Tunnel Complex, Northeast side of block bounded by K, G, Third, & Fifth Streets, Dayton, Montgomery County, OH

242

14. EXTERIOR VIEW OF OLD TENFOOT WIND TUNNEL (1991). ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

14. EXTERIOR VIEW OF OLD TEN-FOOT WIND TUNNEL (1991). - Wright-Patterson Air Force Base, Area B, Buildings 25 & 24,10-foot & 20-foot Wind Tunnel Complex, Northeast side of block bounded by K, G, Third, & Fifth Streets, Dayton, Montgomery County, OH

243

22. EXTERIOR, VIEW OF THE PORTECOCHERE FROM THE NORTH WITH ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

22. EXTERIOR, VIEW OF THE PORTE-COCHERE FROM THE NORTH WITH THE MARK TWAIN CARRIAGE HOUSE (HABS No. CT-365-A) IN THE BACKGROUND - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

244

The Conversion of Exterior Wall Facings for Climbing Activities.  

ERIC Educational Resources Information Center

|The conversion of existing exterior walls to provide facilities for outdoor rock climbing activities is described with particular emphasis on design to provide practice in basic movement skills such as correct use of holds, balance, controlled change of position, traversing, and moving up and down. (JMF)|

March, Bill; Toft, Murray

1979-01-01

245

11. BALD MOUNTAIN MILL, EXTERIOR FROM NORTHEAST, c. 194059. ROASTER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

11. BALD MOUNTAIN MILL, EXTERIOR FROM NORTHEAST, c. 1940-59. ROASTER AND OTHER UNOXIDIZED ORE CIRCUIT ADDITIONS PRESENT, ALONG WITH SECONDARY THICKENER No. 7 AND ADDITIONS TO MACHINE SHOP. CREDIT JW. - Bald Mountain Gold Mill, Nevada Gulch at head of False Bottom Creek, Lead, Lawrence County, SD

246

10. TROJAN MILL, EXTERIOR FROM EAST, c. 191928. ADDITION TO ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

10. TROJAN MILL, EXTERIOR FROM EAST, c. 1919-28. ADDITION TO THE EAST END OF MILLING FLOOR VISIBLE WITH TRAM ENTRY DOOR. ALSO SEEN ARE THE ADDITIONS FOR MILL SOLUTION TANKS AND THE EAST SIDE OF SAMPLING ROOMS. CREDIT JW. - Bald Mountain Gold Mill, Nevada Gulch at head of False Bottom Creek, Lead, Lawrence County, SD

247

5. EXTERIOR SOUTHEAST CORNER VIEW, FACING NORTHWEST. EXTENSIONS TO BUILDING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

5. EXTERIOR SOUTHEAST CORNER VIEW, FACING NORTHWEST. EXTENSIONS TO BUILDING 13 CLEARLY VISIBLE. ROM LEFT TO RIGHT, FORMER BUILDING 13, ADDITION WITH LARGE ROLL-UP DOOR, CANOPY 723. BUILDING 42 VISIBLE IN PERSPECTIVE LINE. - NASA Industrial Plant, Maintenance Facility, 12214 Lakewood Boulevard, Downey, Los Angeles County, CA

248

24 CFR 200.949 - Building product standards and certification program for exterior insulated steel door systems.  

Code of Federal Regulations, 2013 CFR

...certification program for exterior insulated steel door systems. 200.949 Section 200...certification program for exterior insulated steel door systems. (a) Applicable standards. (1) All Exterior Insulated Steel Door Systems shall be designed,...

2013-04-01

249

Torse forming vector fields and exterior concurrent vector fields on Riemannian manifolds and applications  

NASA Astrophysics Data System (ADS)

We interrelate the concept of a torse forming vector field and the concepts of exterior concurrent and quasi-exterior concurrent vector fields. Different second order properties of a torse forming vector field T are studied, as for instance it is proved that any torse forming is a quasi-exterior concurrent vector field. We obtain a necessary and sufficient condition for a torse forming vector field to be 2-exterior concurrent. In this case a foliation is given.

Mihai, Adela; Mihai, Ion

2013-11-01

250

The Galactic metallicity gradient  

Microsoft Academic Search

We have previously published intermediate to high resolution spectroscopic observations of approximately 80 early B-type main-sequence stars situated in 19 Galactic open clus- ters\\/associations with Galactocentric distances distributed over 6 Rg 18 kpc. This current study collates and re-analyses these equivalent-width datasets using LTE and non-LTE model atmosphere techniques, in order to determine the stellar atmo- spheric parameters and abundance

W. R. J. Rolleston; S. J. Smartt; P. L. Dufton; R. S. I. Ryans

2000-01-01

251

Perihelion evolution of observed new comets implies the dominance of the galactic tide in making Oort cloud comets discernable  

Microsoft Academic Search

For an Oort cloud comet to be seen as a new comet, its perihelion must be moved from a point exterior to the loss cylinder boundary to a point interior to observable limits in a single orbit. The galactic tide can do this continuously, in a non-impulsive manner. Near-parabolic comets, with specific angular momentum H?q, will most easily be made

John J. Matese; Jack J. Lissauer

2004-01-01

252

Low-temperature Galactic fountains  

SciTech Connect

Analytic and one- and two-dimensional hydrodynamic calculations are performed to determine whether or not the Galactic fountain model can explain observations of neutral gas in the Galactic halo. Galactic halo gasdynamics are examined, including thermal conduction, Galactic rotation, and Galactic fountains. Results are presented from numerical modeling of low-temperature Galactic fountains. It is found that the best reproduction of the observations is provided by a model near the transonic regime with a temperature and density at the base of the fountain of 300,000 K and 0.001/cu cm, respectively. The cooling time for the hot gas is 33 million yr and the time for newly formed clouds to return to the disk is 47 million yr, neglecting drag forces. 39 refs.

Houck, J.C.; Bregman, J.N. (Virginia Univ., Charlottesville (USA) National Radio Astronomy Observatory, Charlottesville, VA (USA))

1990-04-01

253

Model based evaluation of exterior daylight illuminance distribution  

Microsoft Academic Search

Energy conservation in buildings is greatly influenced by natural daylight in tropical region. A vital step towards development\\u000a and promotion of daylighting technology in buildings is a prior study on estimation of exterior daylight availability for\\u000a illuminating its interiors. In view of this, the present communication depicts the preliminary work progress carried out to\\u000a arrive at a comprehensive idea on

Sheryl G. Colaco; Ciji P. Kurian; V. I. George; Anitha M. Colaco

2009-01-01

254

EXTERIOR VIEW WITH HISTORIC LOCOMOTIVES, COAL AND PASSENGER CARS INCLUDING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR VIEW WITH HISTORIC LOCOMOTIVES, COAL AND PASSENGER CARS INCLUDING THE WOODWARD IRON COMPANY NO. 38 LOCOMOTIVE AND TENDER LOCATED IN THE HEART OF DIXIE MUSEUM'S POWELL AVENUE YARD AND SOUTHERN RAILROAD BOXCARS ON ACTIVE TRACKS OF BIRMINGHAM'S RAILROAD RESERVATION. IN BACKGROUND AT RIGHT AND CENTER IS THE BIRMINGHAM CITY CENTER. - Heart of Dixie Railroad, Rolling Stock, 1800 Block Powell Avenue, Birmingham, Jefferson County, AL

255

EXTERIOR PERSPECTIVE OF CARRIAGE HOUSE SHOWING RELATIONSHIP TO MILK HOUSE, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR PERSPECTIVE OF CARRIAGE HOUSE SHOWING RELATIONSHIP TO MILK HOUSE, LOOKING NORTHWEST. (The carriage house was built by William B. Engle at the end of the 19th century, with carriage storage on the ground floor and a workshop above. Later, his son, Ralph Engle, used the ground floor as a car garage.) - Engle Farm, Carriage House, 89 South Ebey Road, Coupeville, Island County, WA

256

2. EXTERIOR OF FRONT (EAST SIDE) OF BUILDING 105 SHOWING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. EXTERIOR OF FRONT (EAST SIDE) OF BUILDING 105 SHOWING RECESSED PORCH FRAMED BY CRISS-CROSS WOOD BALUSTRADE, STONE FACING ALONG ORIGINAL PORTION OF HOUSE FRONT, AND ORIGINAL PLANK DOOR TO PORCH BASEMENT AT LOWER PHOTO CENTER. WELDED STEEL PORCH RAILINGS VISIBLE AT PHOTO LEFT CENTER WERE ADDED IN 1972. VIEW TO NORTHWEST. - Rush Creek Hydroelectric System, Worker Cottage, Rush Creek, June Lake, Mono County, CA

257

2. EXTERIOR FRONT (SOUTHEAST) SIDE OF BUILDING 117 SHOWING MAIN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. EXTERIOR FRONT (SOUTHEAST) SIDE OF BUILDING 117 SHOWING MAIN RESIDENTIAL STREET IN LOWER FOREGROUND, CEMENT-LAID ROCK RETAINING WALL IN FRONT OF HOUSE, AND CONCRETE STEPS AND WALKWAY TO FRONT PORCH AND DOOR. NOTE SLIDING GLASS DOOR REPLACEMENT FOR ORIGINAL DOOR WHICH HAS SUBSEQUENTLY BEEN REMODELED BACK TO A SINGLE ENTRY DOOR. VIEW TO NORTHWEST. - Bishop Creek Hydroelectric System, Plant 4, Worker Cottage, Bishop Creek, Bishop, Inyo County, CA

258

Advanced exterior sensor project : final report, September 2004.  

SciTech Connect

This report (1) summarizes the overall design of the Advanced Exterior Sensor (AES) system to include detailed descriptions of system components, (2) describes the work accomplished throughout FY04 to evaluate the current health of the original prototype and to return it to operation, (3) describes the status of the AES and the AES project as of September 2004, and (4) details activities planned to complete modernization of the system to include development and testing of the second-generation AES prototype.

Ashby, M. Rodema

2004-12-01

259

2. EXTERIOR OF RUSIN HALL, THE ONLY STRUCTURE TO PREDATED ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. EXTERIOR OF RUSIN HALL, THE ONLY STRUCTURE TO PRE-DATED THE WORLD WAR II EXPANSION THAT LED TO THE DEMOLITION OF THE FIRST WARD OF HOMESTEAD, AN AREA KNOWN AS BELOW THE TRACKS. THE BUILDING WAS ORIGINALLY BUILT AS A FRATERNAL HALL FOR RUTHENIAN IMMIGRANTS BY THE RUSSKY-NARODNY-DOM, INC. - U.S. Steel Homestead Works, Auxiliary Buildings & Shops, Along Monongahela River, Homestead, Allegheny County, PA

260

31. EXTERIOR VIEW LOOKING INTO THE SIXTH TAILRACE (COUNTING FROM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

31. EXTERIOR VIEW LOOKING INTO THE SIXTH TAILRACE (COUNTING FROM THE DOWNSTREAM END TO THE UPSTREAM END SOUTHEAST TO NORTHWEST). THIS AREA IS THE PORTION OF THE PULP MILL THAT WAS NEVER REBUILT AFTER A DEVASTATING FIRE IN 1925 AND SUBSEQUENT END TO PULP PRODUCTION AT THIS SITE. - Potomac Power Plant, On West Virginia Shore of Potomac River, about 1 mile upriver from confluence with Shenandoah River, Harpers Ferry, Jefferson County, WV

261

33. EXTERIOR VIEW LOOKING INTO THE FIFTH TAILRACE (COUNTING FROM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

33. EXTERIOR VIEW LOOKING INTO THE FIFTH TAILRACE (COUNTING FROM THE DOWNSTREAM END TO THE UPSTREAM END SOUTHEAST TO NORTHWEST). THIS AREA IS THE PORTION OF THE PULP MILL THAT WAS NEVER REBUILT AFTER A DEVASTATING FIRE IN 1925 AND SUBSEQUENT END TO PULP PRODUCTION AT THIS SITE. - Potomac Power Plant, On West Virginia Shore of Potomac River, about 1 mile upriver from confluence with Shenandoah River, Harpers Ferry, Jefferson County, WV

262

1. EXTERIOR VIEW OF ELM CITY PLANT (A. FRANCIS WALKER, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW OF ELM CITY PLANT (A. FRANCIS WALKER, 1905-07) FROM SECOND AVENUE ON OPPOSITE SIDE OF ENTRANCE. THIS STRUCTURE WAS ORIGINALLY BUILT AS THE ELM CITY COTTON MILL OF CALLAWAY MILLS. NOTE RESERVOIR IN FOREGROUND. THIS PHOTOGRAPH IS THE LEFT SIDE OF A PANORAMA VIEW THAT INCLUDES HAER Nos. GA-128-2 AND GA-128-3. - Elm City Cotton Mill, 1000 Elm Street, La Grange, Troup County, GA

263

1. EXTERIOR VIEW OF 209 WARE STREET LOOKING SOUTH. THIS ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW OF 209 WARE STREET LOOKING SOUTH. THIS STRUCTURE WAS ONE OF APPROXIMATELY SEVENTEEN DUPLEXES BUILT AS THE ORIGINAL WORKER HOUSING FOR THE LaGRANGE COTTON MILLS, LATER KNOWN AS CALUMET MILL. LaGRANGE MILLS (1888-89) WAS THE FIRST COTTON MILL IN LaGRANGE. NOTE THE GABLE-ON-HIP ROOF FORM AND TWO IDENTICAL STRUCTURES VISIBLE TO THE LEFT. - 209 Ware Street (House), 209 Ware Street, La Grange, Troup County, GA

264

29. EXTERIOR VIEW LOOKING INTO THE FOURTH TAILRACE (COUNTING FROM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

29. EXTERIOR VIEW LOOKING INTO THE FOURTH TAILRACE (COUNTING FROM THE DOWNSTREAM END TO THE UPSTREAM END SOUTHEAST TO NORTHWEST). NOTE THE DRIVE SHAFT, GEAR AND WATER LINE EXTENDING FROM THE STEEL BULKHEAD. THIS EQUIPMENT IS EXTANT FROM THE ERA OF PULP MILL OPERATIONS. - Potomac Power Plant, On West Virginia Shore of Potomac River, about 1 mile upriver from confluence with Shenandoah River, Harpers Ferry, Jefferson County, WV

265

Energy conservation in underground buildings by means of exterior insulation  

Microsoft Academic Search

This study investigates the technical and economic practicality of reducing energy consumption in underground buildings by placing insulating materials directly in the soil or by applying insulation to the exterior portion of the building. The heat transfer analysis used in this study employs a steady-state, two-dimensional finite element formulation. Monthly and annual heat transfer rates from a residential and commercial-size

W. Z. Black; J. G. Hartley; J. M. Manson

1981-01-01

266

11. Credit PSR. Exterior of Building 4305 looking north at ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

11. Credit PSR. Exterior of Building 4305 looking north at the southwest and southeast facades of the hangar. The reels grouped on the apron southeast of the structure are for fiber-optic and telephone cable. The concrete pads in the immediate forground were not identifiable from existing historic drawings or photographs. - Edwards Air Force Base, North Base, Unicon Portable Hangar, First & C Streets, Boron, Kern County, CA

267

Research on exterior noise source dentification of high speed trains  

Microsoft Academic Search

In order to clear about the major source, distribution and frequency characteristics of high speed trains exterior noise in operation, using the advanced noise identification and measure system of multi-channel microphone spoke array, the field tests of high-speed train noise were carried out. The results show that the major noise sources of high speed trains are wheel\\/rail rolling noise and

Jie Zhang; Yong Pan

2011-01-01

268

1. EXTERIOR OVERVIEW OF SOUTH END OF RUSH CREEK POWERHOUSE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR OVERVIEW OF SOUTH END OF RUSH CREEK POWERHOUSE RESIDENTIAL COMPLEX SHOWING THE RUSH CREEK POWERHOUSE AT PHOTO RIGHT, BUILDING 106 NEXT TO THE POWERHOUSE AT PHOTO CENTER, BUILDING 103 AT UPPER PHOTO LEFT, AND BUILDING 104 ABOVE BUILDING 106 PARTIALLY OBSCURED BEHIND TREE AT UPPER PHOTO CENTER. VIEW TO SOUTH. - Rush Creek Hydroelectric System, Worker Cottage, Rush Creek, June Lake, Mono County, CA

269

Covariant Star Product for Exterior Differential Forms on Symplectic Manifolds  

SciTech Connect

After a brief description of the Z-graded differential Poisson algebra, we introduce a covariant star product for exterior differential forms and give an explicit expression for it up to second order in the deformation parameter h, in the case of symplectic manifolds. The graded differential Poisson algebra endows the manifold with a connection, not necessarily torsion-free, and places upon the connection various constraints.

McCurdy, Shannon; Zumino, Bruno [Physics Department, University of California, Berkeley, CA 94720-7300 (United States); Theoretical Physics Group, Lawrence Berkeley Laboratory, Berkeley, CA 947208162 (United States)

2010-02-10

270

Contraceptive Ring  

Microsoft Academic Search

In development for more than 20 years, the first vaginal ring contraceptive (NuvaRing®) was approved by the Food and Drug\\u000a Administration in 2001 and marketed in 2002. Like oral contraceptive (OC) pills, the ring is safe, effective, and rapidly\\u000a reversible (1). It offers the lowest estrogen dose of any estrogenprogestin contraceptive product marketed in the United States. It is\\u000a worn

Susan A. Ballagh

271

The Galactic Center at Different Wavelengths  

NSDL National Science Digital Library

This page from then UCLA Galactic Center Group provides images of the galactic center over most of the electromagnetic spectrum. Each image has explanatory text, and a background section explains the value of observing the galactic center at various wavelengths.

2007-06-22

272

Galactic cosmic rays and nucleosynthesis  

SciTech Connect

The nucleosynthesis of the light elements Li, Be and B by galactic cosmic rays is presented. Observations of cosmic rays and the nuclear reactions responsible for Li, Be and B nucleosynthesis are described, followed by some words on propagation. At the end, some open questions concerning galactic cosmic rays are discussed.

Kiener, Juergen [CSNSM, CNRS-IN2P3 and Universite Paris-Sud, Bat. 104-108, 91405 Orsay Campus (France)

2010-03-01

273

Diffuse galactic radiation  

NASA Astrophysics Data System (ADS)

High-energy interstellar emission is produced by interactions of cosmic-ray electrons and nuclei with the interstellar medium and low-energy radiation fields in the Milky Way. This is not only a background for point-like and extended sources studies, but also a unique tool to learn about cosmic rays and the interstellar medium. Thanks to its energy range from 20 MeV to more than 300 GeV, its large effective area and field of view, its improved angular resolution, as well as an all-sky survey strategy, the Fermi Large Area Telescope (LAT) is the best instrument to study high-energy Galactic interstellar emission, which accounts for most of the photons it detects. To disentangle degeneracies in the GeV range, complementary observations are crucial at lower and higher energy, for example by INTEGRAL/SPI, CGRO/COMPTEL or HESS, as well as all-sky radio or sub-millimeter surveys. We provide an overview of the Galactic interstellar gamma-ray emission modeling and focus on ?-ray H I emissivity and large scale structures studies performed with the LAT.

Casandjian, Jean-Marc

2012-12-01

274

Modeled and metered energy savings from exterior wall insulation  

SciTech Connect

Millions of single-family masonry (block) houses with slab foundations exist in the southern United States. In fact, approximately 50% of Florida`s six million residences are of concrete block construction. The block walls in these homes are usually uninsulated, and the technology for retrofitting wall insulation is not well developed. Two field tests were performed--one near Phoenix, Arizona and one in Cocoa, Florida--to measure the air-conditioning energy savings and demand reduction impact of applying an exterior insulation and finish system (EEFS) to the exterior of the block wall, and gain practical experience with retrofit application techniques and costs. One field test used a {open_quotes}site-fabricated{close_quotes} insulation system, while the other field test used a commercially available system. The field tests measured a savings of 9% in Arizona and less savings in Florida, and emphasized the impact indoor temperature settings have on cooling energy savings: exterior wall insulation on block homes will produce energy savings in Florida houses only if a low cooling thermostat setting is desirable. The field tests also highlighted an improved comfort benefit from the retrofit - namely, elimination of overheating in rooms with south and west exposures. The DOE-2. ID program was used to analyze the energy savings (air-conditioning and heating) and electric demand impact of applying an EIFS. Air-conditioning energy savings were estimated to be in the range of 8% to 10% in many southern U.S. regions. A 12% savings was predicted for Phoenix, Arizona and a savings of 1% to 4% was predicted for seacoast regions, particularly in Florida. These predictions were in good agreement with the measured values. Peak hour cooling energy savings were predicted to be more uniform throughout the country, generally in the range of %8 to %12.

Ternes, M.; Parker, D.; McLain, H.; Barkaszi, S. Jr.

1996-09-01

275

Reduction of exterior differential systems for ordinary variational problems  

NASA Astrophysics Data System (ADS)

This paper deals with the reduction of ordinary variational problems with Abelian and non-Abelian symmetry groups. It differs from the existing results on geometric reduction in the approach that is completely Lagrangian and based on exterior differential systems. In this setting, two procedures of reduction come out naturally: the first one is the Lagrangian analog of the Marsden-Weinstein reduction holding in the symplectic case and the other one, especially in the non-Abelian case, comes out naturally in our setting.

Morando, P.; Sammarco, S.

2012-02-01

276

7. TROJAN MILL, EXTERIOR FROM NORTHWEST, c. 191828. ADDITIONS FOR ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

7. TROJAN MILL, EXTERIOR FROM NORTHWEST, c. 1918-28. ADDITIONS FOR PRIMARY THICKENERS No. 1 AND No. 2, SECONDARY THICKENERS No. 1, No. 2, AND No. 3, AGITATORS, AIR COMPRESSOR, AND PORTLAND FILTERS ARE SHOWN COMPLETE. STAIR ON NORTH SIDE OF CRUDE ORE BINS IS PRESENT AS IS THE LIME BIN ADJACENT TO THE WEST CRUDE ORE BIN, AND THE SNOW SHED ADDED OVER THE TRAMLINE SERVING THE EAST AND WEST CRUDE ORE BINS. ALSO PRESENT IS THE BABBITT HOUSE AND ROCK BIN. CREDIT JW. - Bald Mountain Gold Mill, Nevada Gulch at head of False Bottom Creek, Lead, Lawrence County, SD

277

32. EXTERIOR VIEW LOOKING INTO THE SEVENTH TAILRACE (COUNTING FROM ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

32. EXTERIOR VIEW LOOKING INTO THE SEVENTH TAILRACE (COUNTING FROM THE DOWNSTREAM END TO THE UPSTREAM END - SOUTHEAST TO NORTHWEST). THIS AREA IS THE PORTION OF THE PULP MILL THAT WAS NEVER REBUILT AFTER A DEVASTATING FIRE IN 1925 AND SUBSEQUENT END TO PULP PRODUCTION AT THIS SITE. NOTE THE DRIVE SHAFT AND OTHER REMNANTS FROM THE PULP MILLING OPERATION. - Potomac Power Plant, On West Virginia Shore of Potomac River, about 1 mile upriver from confluence with Shenandoah River, Harpers Ferry, Jefferson County, WV

278

EXTERIOR OVERVIEW, LOOKING NORTH, OF THIS 400' DEEP LIMESTONE QUARRY ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR OVERVIEW, LOOKING NORTH, OF THIS 400' DEEP LIMESTONE QUARRY PIT ('THE OLD PIT') WITH LEDGE PREPARED FOR LIMESTONE EXTRACTION. AN ELEVEN-HOLE SHOT WILL DISLODGE APPROXIMATELY 25,000 TONS OF LIMESTONE WHICH, AFTER LOADING AND CRUSHING, WILL BE USED FOR ROAD CONSTRUCTION. THE CALERA QUARRY IS ONE OF FOUR ACTIVE VULCAN MATERIALS COMPANY QUARRIES IN THE DISTRICT. VULCAN MATERIALS, A FORTUNE 500 FIRM, ESTABLISHED IN BIRMINGHAM IN 1906 AS BIRMINGHAM SLAG COMPANY, VULCAN MATERIALS IS THE NATION'S FOREMOST PRODUCER OF CONSTRUCTION AGGREGATE AND A LEADING CHEMICALS MANUFACTURER. - Vulcan Material Company, Calera Quarry, 1614 Highway 84, Calera, Shelby County, AL

279

EXTERIOR OVERVIEW, LOOKING NORTH, OF THIS 400' DEEP LIMESTONE QUARRY ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR OVERVIEW, LOOKING NORTH, OF THIS 400' DEEP LIMESTONE QUARRY PIT ("THE OLD PIT") WITH LEDGE PREPARED FOR LIMESTONE EXTRACTION. AN ELEVEN-HOLE SHOT WILL DISLODGE APPROXIMATELY 25,000 TONS OF LIMESTONE WHICH, AFTER LOADING AND CRUSHING, WILL BE USED FOR ROAD CONSTRUCTION. THE CALERA QUARRY IS ONE OF FOUR ACTIVE VULCAN MATERIALS COMPANY QUARRIES IN THE DISTRICT. VULCAN MATERIALS, A FORTUNE 500 FIRM, ESTABLISHED IN BIRMINGHAM IN 1906 AS BIRMINGHAM SLAG COMPANY, VULCAN MATERIALS IS THE NATION'S FOREMOST PRODUCER OF CONSTRUCTION AGGREGATE AND A LEADING CHEMICALS MANUFACTURER - Vulcan Material Company, Calera Quarry, 1614 Highway 84, Calera, Shelby County, AL

280

1. EXTERIOR VIEW OF MILL WORKER HOUSE AT 109 GREEN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW OF MILL WORKER HOUSE AT 109 GREEN STREET. HOUSE IS 1 1/2 STORY WITH A CENTER CHIMNEY, KITCHEN ELL IN REAR, AND PORCH EXTENDING FROM THE FRONT. THIS DWELLING WAS CONSTRUCTED BY THE HOGANSVILLE MANUFACTURING COMPANY c. 1900. THE HOGANSVILLE MILL WAS LOCATED ON THE OTHER SIDE OF GREEN STREET UNTIL IT WAS DEMOLISHED IN THE 1970S. CURRENTLY THE SITE IS AN EMPTY LOT SURROUNDED BY A FENCE. - 109 Green Street (House), 109 Green Street, Hogansville, Troup County, GA

281

1. EXTERIOR VIEW OF MILL WORKER HOUSE AT 107 GREEN ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW OF MILL WORKER HOUSE AT 107 GREEN STREET HOUSE IS A WOOD-FRAME DUPLEX WITH A PYRAMIDAL ROOF, KITCHEN ELL IN REAR, AND A PORCH EXTENDING FROM THE FRONT. NOTE 105 GREEN STREET TO RIGHT. THESE DWELLINGS WERE CONSTRUCTED BY HOGANSVILLE MANUFACTURING COMPANY c. 1900. THE MILL WAS LOCATED ON THE OTHER SIDE OF GREEN STREET UNTIL IT WAS DEMOLISHED IN THE 1970S. CURRENTLY THE SITE IS AN EMPTY LOT SURROUNDED BY A FENCE. - 107 Green Street (House), 107 Green Street, Hogansville, Troup County, GA

282

Galactic model of GRBs  

NASA Astrophysics Data System (ADS)

The galactic model of gamma ray bursts (GRBs) is based upon the observed production of soft gamma ray repeaters (SGRs) in the galaxy and the consequences of a reasonable model to explain them. In this view GRBs are the long term result of the burn-out conditions of the SGRs in this and in other galaxies. A delay of (approximately) 30 million years before GRBs are being actively produced can be understood as the time required for the ejected matter during the SGR phase to cool, condense, and form planetesimals that are eventually captured by the central neutron star. The amount of disk matter and the interaction between each GRB and the disk determine the rate of burst production and turn-off time of GRBs. The x-ray afterglow as well as optical emission is derived from x-ray fluorescence and ionization of previously ablated matter.

Colgate, S. A.; Li, H.

1997-09-01

283

Galactic Science with WISE  

NASA Astrophysics Data System (ADS)

The Wide-field Infrared Survey Explorer (WISE) is a cryogenic space telescope to launch in 2009 which will perform a simultaneous all-sky survey at 3.3, 4.7, 12, and 23 microns. With sensitivities many times better than previous missions, WISE is poised to supply mid-infrared spectral energy distributions to most of the objects detected in the near-IR 2MASS survey. This will make the WISE database ideal for detecting and characterizing stars with `warm' infrared excess out to 23 microns. The WISE science team intends to use this capability to search for young debris disk systems in the solar neighborhood, take inventory of planetary nebulae in the Milky Way, and survey all star-forming regions not observed by Spitzer. In this contribution, we will discuss the promise of WISE in performing these and other galactic science investigations.

Padgett, Deborah; Ressler, M.; Mainzer, A.; Cohen, M.; Leisawitz, D.; Cutri, R.; Kirkpatrick, D.; Skrutskie, M.; Wright, E.

2009-01-01

284

Active Galactic Nuclei  

NASA Astrophysics Data System (ADS)

Starting with this volume, the Lecture Notes of the renowned Advanced Courses of the Swiss Society for Astrophysics and Astronomy will be published annually. In each course, three extensive lectures given by leading experts in their respective fields cover different and essential aspects of the subject. The 20th course, held at Les Diablerets in April 1990, dealt with current research on active galactic nuclei; it represents the most up-to-date views on the subject, presented with particular regard for clarity. The previous courses considered a wide variety of subjects, beginning with "Theory of Stellar Athmospheres" in 1971 and ending with "The Milky Way as a Galaxy" in 1989. The Lecture Notes of these Saas-Fee Courses appeared as publications of the Geneva Observatory, from which they can still be ordered (chemin des Maillettes 51, CH-1290 Sauverny, Switzerland).

Blandford, R. D.; Netzer, H.; Woltjer, L.; Courvoisier, T. J.-L.; Mayor, M.

285

Ring accelerators  

SciTech Connect

We present two-dimensional simulations in (r-z) and r-theta) cylinderical geometries of imploding-liner-driven accelerators of rings of charged particles. We address issues of azimuthal and longitudinal stability of the rings. We discuss self-trapping designs in which beam injection and extraction is aided by means of external cusp fields. Our simulations are done with the 2-1/2-D particle-in-cell plasma simulation code CLINER, which combines collisionless, electromagnetic PIC capabilities with a quasi-MHD finite element package.

Gisler, G.; Faehl, R.

1983-01-01

286

Sensorized robotic sphere for large exterior critical infrastructures supervision  

NASA Astrophysics Data System (ADS)

The surveillance and inspection tasks in large exterior critical infrastructures have arisen as critical processes. More complex challenges are now present, and the traditional approaches are sometimes obsolete for facing these new menaces. An alternative system-a mobile sensor, spherical shaped-that provides a flexible, versatile, and reliable way to perform measurements is proposed. Even more, thanks to its original traction method (based on center of gravity destabilization), the system has a result as an all-terrain vehicle that guarantees a safe and friendly interaction with the environment. It has been widely tested, verifying as well the accurate acquisition performance, resulting in this system as a suitable sensing and monitoring alternative.

Hernández, Juan David; Sanz, David; Rodríguez-Canosa, Gonzalo R.; Barrientos, Jorge; del Cerro, Jaime; Barrientos, Antonio

2013-01-01

287

Investigation of vessel exterior air cooling for a HLMC reactor  

SciTech Connect

The Secure Transportable Autonomous Reactor (STAR) concept under development at Argonne National Laboratory provides a small (300 MWt) reactor module for steam supply that incorporates design features to attain proliferation resistance, heightened passive safety, and improved cost competitiveness through extreme simplification. Examples are the achievement of 100%+ natural circulation heat removal from the low power density/low pressure drop ultra-long lifetime core and utilization of lead-bismuth eutectic (LBE) coolant enabling elimination of main coolant pumps as well as the need for an intermediate heat transport circuit. It is required to provide a passive means of removing decay heat and effecting reactor cooldown in the event that the normal steam generator heat sink, including its normal shutdown heat removal mode, is postulated to be unavailable. In the present approach, denoted as the Reactor Exterior Cooling System (RECS), passive decay heat removal is provided by cooling the outside of the containment/guard vessel with air. RECS is similar to the Reactor Vessel Auxiliary Cooling System (RVACS) incorporated into the PRISM design. However, to enhance the heat removal, RECS incorporates fins on the containment vessel exterior to enhance heat transfer to air as well as removable steel venetian conductors that provide a conduction heat transfer path across the reactor vessel-containment vessel gap to enhance heat transfer between the vessels. The objective of the present work is to investigate the effectiveness of air cooling in removing heat from the vessel and limiting the coolant temperature increase following a sudden complete loss of the steam generator heat sink.

Sienicki, J. J.; Spencer, B. W.

2000-01-13

288

2 Rings  

NSDL National Science Digital Library

This activity helps students develop concepts and language related to position by experimenting with the size and relationships between two circles in a qualitative way. They use terms such as outside, touching and overlapping. The Teachers' Notes page includes suggestions for implementation and discussion questions. Students then can move to a follow-up activity, 3 Rings, cataloged separately.

2007-02-01

289

Thermographic method for evaluation of thermal influence of exterior surface colour of buildings  

Microsoft Academic Search

Architecture colour is an important part in urban designing. It directly affects the expressing and the thermal effect of exterior surface of buildings. It has proved that four factors affect the sign visibility, graphics, colour, lighting condition and age of the observers, and colour is the main aspect. The best method is to prevent the exterior space heating up in

Yanpeng Wu; Deying Li; Rendong Jin; Li Liu; Jiabin Bai; Jianming Feng

2008-01-01

290

The galactic structure towards the galactic centre. II. A study of the fields near the clusters NGC 6603, Lynga 7 and Terzan 1.  

NASA Astrophysics Data System (ADS)

The results are presented from a study of Colour-Magnitude Diagrams in three fields, located in the galactic plane towards the Galactic Centre. First the extinction is determined in the line of sight. In two fields a significant increase in the absorption is found. For the field near Terzan 1 the increase starts immediately at 0kpc in the line of sight and for the field near NGC 6603 it occurs between 3.5kpc and 4.0kpc. The latter apparently coincides with the position of the molecular ring. The abrupt end in the steep increment in the absorption is likely the result of gas consumption by star formation. In two fields a significant increase in the number of stars with probably a contribution from a stellar ring has been found. The stellar ring can be described with a Gaussian centered around 3.5kpc from the Galactic Centre with ?_ring_=0.5kpc. Between 1.0 to about 3.0kpc in the line of sight a stellar contribution is present from the Sagittarius spiral arm. In the fields near the clusters Lynga 7 and Terzan 1 relatively young stars are present from a recent burst of star formation. The field of NGC 6603 crosses a patchy region in this arm where this recent burst is absent. In all fields the major contribution for V<22mag is due to disc stars. Around 2.5kpc from the Galactic Centre we find a sharp drop in the stellar density of the disc. The stellar density towards the Galactic Centre is still increasing due to the stellar contribution from the Bulge. Therefore we identify this as the disc/bulge transition. For the Bulge we suggest the presence of a super metal rich population.

Bertelli, G.; Bressan, A.; Chiosi, C.; Ng, Y. K.; Ortolani, S.

1995-09-01

291

Active Galactic Nuclei  

NASA Astrophysics Data System (ADS)

Active galactic nuclei (AGN) represent an extreme stage in the life cycle of a galaxy. For a relatively short period of time ( ˜ 108 years or less), a region less than a parsec across at the center of a galaxy produces tremendous amounts of energy, often outshining the rest of the galaxy by orders of magnitude. The most luminous of these objects are the most powerful, continuously emitting sources in the universe. The observational characteristics of AGN are reviewed, as well as how these properties are used to sort them into different classes. The evidence that supports the current paradigm, under which the central source powering AGN is a supermassive black hole, is discussed. While these are found in virtually all bright galaxies, in AGN the black holes are actively accreting matter, most likely as a result of an increased matter density in their immediate environs. A variety of accretion models are considered, particularly disk and Bondi accretion, along with the mechanisms by which material is carried inward and angular momentum is dissipated. Photoionization models for the broad and narrow emission line regions are reviewed in detail, including the physical conditions that prevail in each and their location relative to the central black hole. The evidence for unified models is presented. Under unified models, different types of AGN are related by means of viewing angle. A key aspect of these models is the presence of large-scale obscuring regions within the active nucleus. The phenomenology of nuclear absorption is discussed, both within the torus as well as in lines, along with present models for these obscuring regions. Also discussed are generation mechanisms for and the physics of relativistic jets, which are present in 10-20% of AGN. Finally, the entire picture is brought together by discussing the evolution of AGN.

Perlman, Eric S.

292

A Disturbed Galactic Duo  

NASA Astrophysics Data System (ADS)

The galaxies in this cosmic pairing, captured by the Wide Field Imager on the MPG/ESO 2.2-metre telescope at the La Silla Observatory in Chile, display some curious features, demonstrating that each member of the duo is close enough to feel the distorting gravitational influence of the other. The gravitational tug of war has warped the spiral shape of one galaxy, NGC 3169, and fragmented the dust lanes in its companion NGC 3166. Meanwhile, a third, smaller galaxy to the lower right, NGC 3165, has a front-row seat to the gravitational twisting and pulling of its bigger neighbours. This galactic grouping, found about 70 million light-years away in the constellation Sextans (The Sextant), was discovered by the English astronomer William Herschel in 1783. Modern astronomers have gauged the distance between NGC 3169 (left) and NGC 3166 (right) as a mere 50 000 light-years, a separation that is only about half the diameter of the Milky Way galaxy. In such tight quarters, gravity can start to play havoc with galactic structure. Spiral galaxies like NGC 3169 and NGC 3166 tend to have orderly swirls of stars and dust pinwheeling about their glowing centres. Close encounters with other massive objects can jumble this classic configuration, often serving as a disfiguring prelude to the merging of galaxies into one larger galaxy. So far, the interactions of NGC 3169 and NGC 3166 have just lent a bit of character. NGC 3169's arms, shining bright with big, young, blue stars, have been teased apart, and lots of luminous gas has been drawn out from its disc. In NGC 3166's case, the dust lanes that also usually outline spiral arms are in disarray. Unlike its bluer counterpart, NGC 3166 is not forming many new stars. NGC 3169 has another distinction: the faint yellow dot beaming through a veil of dark dust just to the left of and close to the galaxy's centre [1]. This flash is the leftover of a supernova detected in 2003 and known accordingly as SN 2003cg. A supernova of this variety, classified as a Type Ia, is thought to occur when a dense, hot star called a white dwarf - a remnant of medium-sized stars like our Sun - gravitationally sucks gas away from a nearby companion star. This added fuel eventually causes the whole star to explode in a runaway fusion reaction. The new image presented here of a remarkable galactic dynamic duo is based on data selected by Igor Chekalin for ESO's Hidden Treasures 2010 astrophotography competition. Chekalin won the first overall prize and this image received the second highest ranking of the nearly 100 contest entries [2]. Notes [1] Other much more noticeable points of light, such as the one toward the left end of the spiral arm running underneath of NGC 3169's core, are stars within the Milky Way that happen to fall by chance very close to the line of sight between our telescopes and the galaxies. [2] ESO's Hidden Treasures 2010 competition gave amateur astronomers the opportunity to search through ESO's vast archives of astronomical data, hoping to find a well-hidden gem that needed polishing by the entrants. To find out more about Hidden Treasures, visit http://www.eso.org/public/outreach/hiddentreasures/. More information ESO, the European Southern Observatory, is the foremost intergovernmental astronomy organisation in Europe and the world's most productive astronomical observatory. It is supported by 15 countries: Austria, Belgium, Brazil, the Czech Republic, Denmark, France, Finland, Germany, Italy, the Netherlands, Portugal, Spain, Sweden, Switzerland and the United Kingdom. ESO carries out an ambitious programme focused on the design, construction and operation of powerful ground-based observing facilities enabling astronomers to make important scientific discoveries. ESO also plays a leading role in promoting and organising cooperation in astronomical research. ESO operates three unique world-class observing sites in Chile: La Silla, Paranal and Chajnantor. At Paranal, ESO operates the Very Large Telescope, the world's most advanced visible-light astronomical observatory and VISTA, the world

2011-04-01

293

Evolution of active galactic nuclei  

SciTech Connect

This dissertation presents detailed, self-consistent, computer simulations of the evolution of active galactic nuclei. A one-dimensional Fokker-Planck code is used to determine the evolution of the stellar system, and another code which integrates the steady state, one-dimensional hydrodynamics equations is used to determine the flow profile of the interstellar medium. Galactic nuclei exhibit a variety of evolution vary stages characterized by the flow profile of the interstellar medium. The particular stages a given galactic nucleus evolves through depend primarily on its central stellar density. Tightly bound galactic nuclei with central stellar densities greater than 3 x 10/sup 9/ M/sub 0/ pc/sup -3/ retain all of the gas liberated by the stellar system, and the interstellar medium remains in a state of pure accretion. Galactic nuclei with central stellar densities less than this value lose some of the gas liberated by the stars in a wind driven by Compton heating. These systems evolve first through a pure accretion phase followed by an interstellar medium flow with an inner accretion region and an outer wind and finally by a second period of pure accretion. The luminosity evolution in these models is characterized by an early phase of Eddington-limited accretion onto the central black hole.

David, L.P.

1985-01-01

294

The Galactic Millisecond Pulsar Population  

NASA Astrophysics Data System (ADS)

Among the current sample of over 2000 radio pulsars known primarily in the disk of our Galaxy, millisecond pulsars now number almost 200. Due to the phenomenal success of blind surveys of the Galactic field, and targeted searches of Fermi gamma-ray sources, for the first time in over a decade, Galactic millisecond pulsars now outnumber their counterparts in globular clusters! In this paper, I briefly review earlier results from studies of the Galactic millisecond pulsar population and present new constraints based on a sample of 60 millisecond pulsars discovered by 20 cm Parkes multibeam surveys. I present a simple model of the population containing ~ 30,000 potentially observable millisecond pulsars with a luminosity function, radial distribution and scale height that matches the observed sample of objects. This study represents only a first step towards a more complete understanding of the parent population of millisecond pulsars in the Galaxy and I conclude with some suggestions for further study in this area.

Lorimer, Duncan R.

2013-03-01

295

Galactic structure from photometric surveys.  

NASA Astrophysics Data System (ADS)

Seventeen of twenty known or suspected dwarf galaxy satellites of the Milky Way were discovered through photometric images. Six significant tidal streams are known in the Galactic spheroid, all of which were discovered through photometric surveys. At present, only photometric surveys provide enough sky coverage and depth to probe the shape of the Milky Way. We argue that the Virgo Stellar Stream, which might be a stream or a disrupting dwarf galaxy, has a center 14-19 kpc from the Sun in the direction (l,b)=(300o,64o), using photometry from the Sloan Digital Sky Survey (SDSS) and the Sloan Extension for Galactic Understanding and Exploration (SEGUE). In the process, we demonstrate the importance of large, deep, multi-color, public photometric sky surveys with precision color information. Currently, the most urgent need is for data in the southern hemisphere and at low Galactic latitude. Deeper surveys would also be useful.

Newberg, H. J.; Mayeur, P. A.; Yanny, B.; SEGUE Collaboration

296

The Galactic bulge (Review)  

NASA Astrophysics Data System (ADS)

I will review recent results concerning the age and chemical evolution of galactic bulges, with emphasis on the bulge of the Milky Way. The metal-rich bar population of the ``bulge'' has distinct bar kinematics, no correlation between abundances and kinematics, and formed over a small interval. The age of the bar is <10% different from the metal rich bulge globular clusters. Yet the bar population has long period Mira variables, with a distinct bar asymmetry. The RR Lyrae stars in the spheroid do not have the bar asymmetry: both of these points are consistent with the bar forming later than the halo/inner spheroid. The chemistry and abundance distribution of the bar stars, and constraints on formation, will be discussed. Metal rich stars in the deep halo of M31 (revealed from HST imaging) suggest that the bulge and halo of that galaxy are more closely connected in chemistry than is the case for our own galaxy. The preponderance of evidence still favors a chemical evolution scenario in which bulges enrich rapidly according to a simple single zone chemical evolution scenario. However, element abundances in individual bulge giants do not show the uniform enhancement of alpha-capture elements that one would expect from a rapid, violent starburst; this is confirmed with new data. This might be consistent with suggestions that the proto-bulge formed out of gas that remained and dissipated after the formation of the halo. The presence of apparent contradictions poses a serious hurdle in developing a theory of bulge formation. The high star density and bar kinematics implies considerable dissipation, yet accompanying (expected) age dispersions and correlations between abundances and kinematics are not present. There is evidence that the bulge formed rapidly, yet the clear chemistry of a starburst is lacking. Inflow of gas and accompanying growth of central nuclear populations are expected to have disrupted the bar over a Hubble time, yet it is clearly present. New observations will be proposed to help resolve these contradictions.

Rich, R. M.

297

Metal concentrations in aggregate interiors, exteriors, whole aggregates, and bulk of Costa Rican soils  

SciTech Connect

In many temperate soils the preferential weathering and leaching of aggregate surfaces and the nonaggregated material between aggregates depletes geogenic metals. It also shifts metals from strongly to more weakly bound metal forms. Deposited metals are sorbed preferentially on aggregate surfaces and between aggregates. The authors examined whether preferential desilication under tropical climate causes an enrichment in the aggregate exteriors in oxidic forms of metals. They also studied where deposited metals are bound in these soils. Aggregates (2--20 mm) were selected manually from the A horizons of eight Oxisols, six Andisols, two Mollisols, and two Inceptisols in Costa Rica. All samples were fractionated into interior and exterior portions and treated with a seven-step sequence to extract Al, Cd, Cu, Fe, Mn, Pb, and Zn. Total concentrations of all metals except Zn were higher in the aggregate exteriors than in the interiors. The average Cd and Pb concentrations in easily extractable fractions were significantly higher in the aggregate exteriors. There were no significant differences in metal partitioning between interiors and exteriors except for Pb, which had higher proportions in extractable forms with NH{sub 2}OH {center{underscore}dot} HCl {gt} NH{sub 4} - acetate, pH 6.0 {gt} EDTA in the exteriors. There were few significant differences in metal concentrations and partitioning between bulk soil and whole aggregates. The results may be explained by (i) preferential desilication of the aggregate exteriors and (ii) preferential sorption of deposited heavy metals mainly in easily extractable forms.

Wilcke, W.; Kretzschmar, S.; Bundt, M.; Zech, W.

1999-10-01

298

Probable gravitational microlensing toward the galactic bulge  

Microsoft Academic Search

The Massive Compact Halo Object (MACHO) project carries out regular photometric monitoring of millions of stars in the Magellanic Cloud and the Galactic bulge, to search for very rare gravitational microlensing events due to compact objects in the Galactic halo and disk. A preliminary analysis of one field in the Galactic bulge, containing approximately 430,000 stars observed for 190 days,

C. Alcock; R. A. Allsman; T. S. Axelrod; D. P. Bennett; K. H. Cook; K. C. Freeman; K. Griest; S. L. Marshall; S. Perlmutter; M. R. Pratt; P. J. Quinn; A. W. Rodgers; C. W. Stubbs; W. Sutherland

1995-01-01

299

The Heliosphere and Galactic Cosmic Rays  

NASA Video Gallery

The heliosphere deflects galactic cosmic rays from entering the system. Galactic cosmic rays are a very high energy form of particle radiation that are extremely difficult to shield against and are harmful to astronauts. The boundaries surrounding our heliosphere deflect the majority of galactic radiation from the inner solar system.

Holly Zell

2010-09-28

300

Cluster magnetic fields from galactic outflows  

Microsoft Academic Search

We performed cosmological, magnetohydrodynamical simulations to follow the evolution of magnetic fields in galaxy clusters, exploring the possibility that the origin of the magnetic seed fields is galactic outflows during the starburst phase of galactic evolution. To do this, we coupled a semi-analytical model for magnetized galactic winds as suggested by Bertone, Vogt & Enßlin to our cosmological simulation. We

J. Donnert; K. Dolag; H. Lesch; E. Müller

2009-01-01

301

Volume-Limited Dependent Galactic Model Parameters  

Microsoft Academic Search

We estimate 34 sets of Galactic model parameters for three intermediate-latitude fields with Galactic longitudes l = 60°, l = 90°, and l = 180°, and we discussed their dependence on the volume. Also, we confirm the variation of these parameters with absolute magnitude and Galactic longitude. The star samples in two fields are restricted with bright and unit absolute-magnitude

S. Karaali; S. Bilir; E. Yaz; E. Hamzaoglu; R. Buser

2007-01-01

302

Ringing wormholes  

SciTech Connect

We investigate the response of traversable wormholes to external perturbations through finding their characteristic frequencies and time-domain profiles. The considered solution describes traversable wormholes between the branes in the two brane Randall-Sundrum model and was previously found within Einstein gravity with a conformally coupled scalar field. The evolution of perturbations of a wormhole is similar to that of a black hole and represents damped oscillations (ringing) at intermediately late times, which are suppressed by power-law tails (proportional to t{sup -2} for monopole perturbations) at asymptotically late times.

Konoplya, R.A.; Molina, C. [Instituto de Fisica, Universidade de Sao Paulo, C.P. 66318, 05315-970, Sao Paulo-SP (Brazil); Escola de Artes, Ciencias e Humanidades, Universidade de Sao Paulo, Avenida Arlindo Bettio 1000, CEP 05315, Sao Paulo-SP (Brazil)

2005-06-15

303

Magnetic braking in galactic flows  

SciTech Connect

The nuclear fireworks of active galaxies are believed to derive their power from the kinetic energy of gas falling onto a massive central objects; mass shed from evolving galactic stars is an obvious source of fuel for this process. But this ejected material shares the galactic rotation, and a centrifugal barrier will prevent it from reaching the nucleus, if its angular momentum is not removed. This paper shows that, if the large-scale galactic magnetic field has a strong enough radial component, magnetic torques can act to spin down the infalling matter. Rotation of the interstellar gas induces a toroidal magnetic field, and Maxwell stresses remove angular momentum from the flow; gas can then fall inward to the galactic center. In this way, the monster in the nucleus can be fed on gas from a galaxy's own stars. The magnetic fields in M87 and NGC 1275, giant elliptical galaxies which are accreting from an intracluster medium, appear to be strong enough to allow magnetic braking.

Sparke, L.S.

1982-09-01

304

Large-scale distribution of molecular gas in the first Galactic quadrant  

SciTech Connect

The emission parameters for the molecular component of the interstellar medium are determined throughout the first Galactic quadrant. Face-on maps of the peak midplane molecular density, scale height, and offset from b = 0 deg with roughly 300 pc resolution are presented. These maps are compared with the distribution of cataloged H II regions to test whether both species trace the same Galactic locations. The properties of the spiral (or ringlike) arms are deduced from the derived images and pitch-angle upper limits are estimated. The H II regions are strongly correlated with the dense molecular rings. 33 references.

Clemens, D.P.; Sanders, D.B.; Scoville, N.Z.

1988-04-01

305

Three Galactic globular cluster candidates  

NASA Astrophysics Data System (ADS)

Context. The census of Galactic globular clusters (GCs) is still incomplete, and about ten new objects are supposed to await discovery, hidden behind the crowded and reddened regions of the Galactic bulge and disk. Aims: We investigated the nature of three new GC candidates, discovered in the frames collected by the Vista Variables in the Via Lactea (VVV) near-infrared survey. They will be called VVV CL002, VVV CL003, and VVV CL004. Methods: We studied the results of point-spread-function near-infrared photometry from VVV data for the three objects and their surrounding fields, the proper motion information available in the literature and, when possible, we derived the cluster parameters by means of calibrated indices measured on the color-magnitude diagrams. Results: The evidence shows that VVV CL002 is a newly discovered, small, moderately metal-rich ( [Fe/H] ? - 0.4) Galactic GC. It is located at a Galactocentric distance of 0.7 ± 0.9 kpc, and it could be one of the nearest GC to the Galactic center. Its characteristics are more similar to those of low-mass, Palomar-like GCs than to more classical, old, and massive bulge GCs. VVV CL003 is the first star cluster discovered in the Galactic disk on the opposite side of the center with respect to the Sun, at a Galactocentric distance of ~5 kpc. Its high metallicity ( [Fe/H] ? - 0.1) and location point to an open cluster, but a GC cannot be excluded. VVV CL004, on the contrary, is most probably only a random clump of field stars, as indicated by both its low statistical significance and by the impossibility to distinguish its stars from the surrounding field population. Conclusions: We claim the detection of i) a new Galactic GC, deriving an estimate of its basic parameters; ii) a stellar aggregate, probably an open cluster, in the disk directly beyond the Galactic center; and iii) an overdensity of stars, most probably an asterism. Based on observations gathered with ESO-VISTA telescope (proposal ID 172.B-2002).

Moni Bidin, C.; Mauro, F.; Geisler, D.; Minniti, D.; Catelan, M.; Hempel, M.; Valenti, E.; Valcarce, A. A. R.; Alonso-García, J.; Borissova, J.; Carraro, G.; Lucas, P.; Chené, A.-N.; Zoccali, M.; Kurtev, R. G.

2011-11-01

306

EXTERIOR VIEW LOOKING WEST,BLAST FURNACE TO THE RIGHT, ORE YARD ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR VIEW LOOKING WEST,BLAST FURNACE TO THE RIGHT, ORE YARD TO THE CENTER, HEYL & PATTERSON CAR DUMPER TO THE LEFT. - Pittsburgh Steel Company, Monessen Works, Blast Furnace No. 3, Donner Avenue, Monessen, Westmoreland County, PA

307

Partial exterior view of the south side U.S. Naval ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Partial exterior view of the south side - U.S. Naval Base, Pearl Harbor, Marine Railway No. 2 Machine House & Substation, Near intersection of Avenue G & Third Street, northwest of Dry Dock No. 3, Pearl City, Honolulu County, HI

308

Partial exterior view of the east side U.S. Naval ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Partial exterior view of the east side - U.S. Naval Base, Pearl Harbor, Marine Railway No. 2 Machine House & Substation, Near intersection of Avenue G & Third Street, northwest of Dry Dock No. 3, Pearl City, Honolulu County, HI

309

New exact solution for the exterior gravitational field of a charged spinning mass  

SciTech Connect

An exact asymptotically flat solution of the Einstein-Maxwell equations describing the exterior gravitational field of a charged rotating axisymmetric mass possessing an arbitrary set of multipole moments is presented explicitly.

Chamorro, A. (Departamento de Fisica Teorica, Universidad del Pais Vasco, Apartado 644, 48080 Bilbao (Spain)); Manko, V.S. (Department of Theoretical Physics, Peoples' Friendship University, Ordzhonikidze Street 3, Moscow 117198 (U.S.S.R.)); Denisova, T.E. (Department of Mathematical Analysis, Peoples' Friendship University, Ordzhonikidze Street 3, Moscow 117198 (U.S.S.R.))

1991-11-15

310

New exact solution for the exterior gravitational field of a spinning mass  

SciTech Connect

An exact asymptotically flat solution of the vacuum Einstein equations representing the exterior gravitational field of a stationary axisymmetric mass with an arbitrary mass-multipole structure is presented.

Manko, V.S. (School of Mathematical Sciences, Queen Mary and Westfield College, University of London, London E14NS, United Kingdom (GB) Department of Theoretical Physics, Peoples' Friendship University, Ordzhonikidze Street 3, Moscow 117198, U.S.S.R. (SU))

1990-04-02

311

1. OBLIQUE/EXTERIOR VIEW OF COURTHOUSE SQUARE WITH COURTHOUSE AND CONFEDERATE ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. OBLIQUE/EXTERIOR VIEW OF COURTHOUSE SQUARE WITH COURTHOUSE AND CONFEDERATE MONUMENT (RIGHT), JAIL (CENTER LEFT) AND FIRST PRESBYTERIAN CHURCH (LEFT) - Bibb County Courthouse & Jail, Courthouse Square, Centreville, Bibb County, AL

312

General exterior view looking north. Boiler house is center/left. Engine ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

General exterior view looking north. Boiler house is center/left. Engine house is center right. - Burnsville Natural Gas Pumping Station, Saratoga Avenue between Little Kanawha River & C&O Railroad line, Burnsville, Braxton County, WV

313

Exterior view looking north/northwest showing water intake from Little Kanawha ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior view looking north/northwest showing water intake from Little Kanawha River on right. - Burnsville Natural Gas Pumping Station, Saratoga Avenue between Little Kanawha River & C&O Railroad line, Burnsville, Braxton County, WV

314

9. DETAILED EXTERIOR VIEW OF WEB AT U3L3, SHOWING VERTICAL, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

9. DETAILED EXTERIOR VIEW OF WEB AT U3L3, SHOWING VERTICAL, ARCH RIB, LOWER CHORD AND WELDED/BOLTED GUSSET PLATE, LOOKING SOUTHWEST - Cottonville Bridge, County Road D-61 at Farmer's Creek, Maquoketa, Jackson County, IA

315

2. EXTERIOR NORTHWEST VIEW (1992). WrightPatterson Air Force Base, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. EXTERIOR NORTHWEST VIEW (1992). - Wright-Patterson Air Force Base, Area B, Building 6, Signal Corps Special Forces Hangar, On flightline at Southeast corner of Eleventh & C Streets, Dayton, Montgomery County, OH

316

1. EXTERIOR SOUTHEAST VIEW (1991). WrightPatterson Air Force Base, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR SOUTHEAST VIEW (1991). - Wright-Patterson Air Force Base, Area B, Building 6, Signal Corps Special Forces Hangar, On flightline at Southeast corner of Eleventh & C Streets, Dayton, Montgomery County, OH

317

3. EXTERIOR NORTH VIEW (1992). WrightPatterson Air Force Base, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. EXTERIOR NORTH VIEW (1992). - Wright-Patterson Air Force Base, Area B, Building 6, Signal Corps Special Forces Hangar, On flightline at Southeast corner of Eleventh & C Streets, Dayton, Montgomery County, OH

318

4. EXTERIOR NORTHEAST VIEW (1992). WrightPatterson Air Force Base, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

4. EXTERIOR NORTHEAST VIEW (1992). - Wright-Patterson Air Force Base, Area B, Building 6, Signal Corps Special Forces Hangar, On flightline at Southeast corner of Eleventh & C Streets, Dayton, Montgomery County, OH

319

U.S. INSPECTION STATION, TECATE, EXTERIOR VIEW, PARAPET AND SHIELD DETAIL ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

U.S. INSPECTION STATION, TECATE, EXTERIOR VIEW, PARAPET AND SHIELD DETAIL ON WEST FACADE, LOOKING EAST. SEPTEMBER 22, 2003. - U.S. Inspection Station, Main Building, California State Highway 188, Tecate Road, Tecate, San Diego County, CA

320

OBLIQUE/EXTERIOR VIEW, FRONT (NORTH) ELEVATION WITH THREE ENTRANCES TO FORMER ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

OBLIQUE/EXTERIOR VIEW, FRONT (NORTH) ELEVATION WITH THREE ENTRANCES TO FORMER COMPANY MEAT, GROCERY AND DRY GOODS OPERATIONS. - Mulga Commisary, Off AL 269 at I 20-59, Birmingham, Jefferson County, AL

321

3. Historic American Buildings Survey Bruce CunninghamWerdnigg, Photographer, 1970 EXTERIOR ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. Historic American Buildings Survey Bruce Cunningham-Werdnigg, Photographer, 1970 EXTERIOR FACING WHITNEY AVENUE Credit line of photographer must accompany reproduction - Atwater-Ciampolini House, 321 Whitney Avenue, New Haven, New Haven County, CT

322

Exterior 3/4 view of north and west sides of la ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior 3/4 view of north and west sides of la casa, showing entrance to first story, view towards the south. - Pou Coffee Processing Structure, Casa No. 2, Highway 139, Kilometer 12, Maraguez, Ponce Municipio, PR

323

MOVEMENT AND DEPOSITION OF PESTICIDES WITHIN RESIDENCES AFTER INTERIOR AND EXTERIOR APPLICATIONS  

EPA Science Inventory

In a study begun in 1999, the Environmental Protection Agency (EPA) investigated the temporal and spatial distributions of pesticides applied by homeowners and commercial applicators for indoor crack and crevice and exterior perimeter treatments. In each participating househol...

324

Some Collapsing Cylinders and Their Exterior Vacuum Metrics in General Relativity.  

National Technical Information Service (NTIS)

A cylindrical form of the Friedman metric is used to obtain nonstatic infinite cylinders of incoherent fluid. The vacuum metrics exterior to the cylinders are determined from the hypothesis that the metric tensor and its first partial derivatives be conti...

W. J. Cocke

1967-01-01

325

STRUCTURED MOLECULAR GAS REVEALS GALACTIC SPIRAL ARMS  

SciTech Connect

We explore the development of structures in molecular gas in the Milky Way by applying the analysis of the brightness distribution function and the brightness distribution index (BDI) in the archival data from the Boston University-Five College Radio Astronomy Observatory {sup 13}CO J = 1-0 Galactic Ring Survey. The BDI measures the fractional contribution of spatially confined bright molecular emission over faint emission extended over large areas. This relative quantity is largely independent of the amount of molecular gas and of any conventional, pre-conceived structures, such as cores, clumps, or giant molecular clouds. The structured molecular gas traced by higher BDI is located continuously along the spiral arms in the Milky Way in the longitude-velocity diagram. This clearly indicates that molecular gas changes its structure as it flows through the spiral arms. Although the high-BDI gas generally coincides with H II regions, there is also some high-BDI gas with no/little signature of ongoing star formation. These results support a possible evolutionary sequence in which unstructured, diffuse gas transforms itself into a structured state on encountering the spiral arms, followed by star formation and an eventual return to the unstructured state after the spiral arm passage.

Sawada, Tsuyoshi [Joint ALMA Office, Alonso de Cordova 3107, Vitacura, Santiago 763-0355 (Chile); Hasegawa, Tetsuo [NAOJ Chile Observatory, Joaquin Montero 3000 Oficina 702, Vitacura, Santiago 763-0409 (Chile); Koda, Jin, E-mail: sawada.tsuyoshi@nao.ac.jp [Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794-3800 (United States)

2012-11-01

326

Structured Molecular Gas Reveals Galactic Spiral Arms  

NASA Astrophysics Data System (ADS)

We explore the development of structures in molecular gas in the Milky Way by applying the analysis of the brightness distribution function and the brightness distribution index (BDI) in the archival data from the Boston University-Five College Radio Astronomy Observatory 13CO J = 1-0 Galactic Ring Survey. The BDI measures the fractional contribution of spatially confined bright molecular emission over faint emission extended over large areas. This relative quantity is largely independent of the amount of molecular gas and of any conventional, pre-conceived structures, such as cores, clumps, or giant molecular clouds. The structured molecular gas traced by higher BDI is located continuously along the spiral arms in the Milky Way in the longitude-velocity diagram. This clearly indicates that molecular gas changes its structure as it flows through the spiral arms. Although the high-BDI gas generally coincides with H II regions, there is also some high-BDI gas with no/little signature of ongoing star formation. These results support a possible evolutionary sequence in which unstructured, diffuse gas transforms itself into a structured state on encountering the spiral arms, followed by star formation and an eventual return to the unstructured state after the spiral arm passage.

Sawada, Tsuyoshi; Hasegawa, Tetsuo; Koda, Jin

2012-11-01

327

Permanent magnet synchronous motor with exterior-rotor : Distributed or concentrated windings – motor performance comparison  

Microsoft Academic Search

Purpose – The paper aims to present the comparison between the performances of the exterior-rotor permanent magnet synchronous motors with distributed windings and the performances of the exterior-rotor permanent magnet synchronous motors with concentrated windings. Design\\/methodology\\/approach – Finite element method is used for motors performance determination. The BLDC operation mode for the motors with different slot and pole number combination

Bojan Štumberger; Gorazd Štumberger; Miralem Hadžiselimovi?; Ivan Zagradišnik; Anton Hamler; Mladen Trlep

2006-01-01

328

The Herschel Infrared Galactic Plane Survey: Hi-GAL  

NASA Astrophysics Data System (ADS)

The Herschel infrared GALactic Plane Survey has been granted time to observe 480 square degrees of the Galactic Plane with the PACS and SPIRE on-board the 3.5 meter Herschel Space Observatory in five bands; 70, 160, 250, 350, and 500 ?m. The original Hi-GAL Open Time Key Project observed 240 square-degrees in the inner Galaxy from l = -60o to +60o, b = -1o to +1o. This portion of the survey includes the Central Molecular Zone surrounding the Galactic center and the Molecular Ring in the inner Galaxy. During Open Time 1 (OT1), time was granted to observe an additional 240 square degrees in the outer Galaxy from l = 120o to 240o. Hi-GAL240 provides a high-resolution view of the closest portion of the Perseus Arm in the outer Galaxy and the anti-center region. A proposal has been submitted to complete coverage of the entire Galactic Plane in OT2. Hi-GAL provides a sensitive, high-resolution (5” to 35") view of the far-infrared and sub-mm dust-continuum from dense clumps, filaments, and clouds, highly embedded proto-stars, HII regions, FUV-heated bubbles, post-main sequence objects, and the diffuse ISM along the Galactic Plane. Hi-GAL data is being used to map the dust temperature and column density distribution in the Galaxy, to identify the most embedded proto-stars and proto-clusters, to measure the properties of dust emitting structures in all stages of their evolution as function of location and environment, and to probe the Galactic ecology - the cycling of gas from the ISM into stars and back into the ISM. Hi-GAL will serve as a template for the interpretation of far-infrared and sub-mm continuum emission from galaxies in the near and distant Universe where individual star forming complexes and dust structures can not be resolved. I will review some highlights and key results provided by Hi-GAL.

Bally, John

2012-01-01

329

NuSTAR Galactic Plane Survey and Galactic Binaries Program  

NASA Astrophysics Data System (ADS)

The NuSTAR Galactic science program includes a Galactic plane survey and observations of specific Galactic binaries. The survey includes a 2x0.8 degree field near Sgr A*, in which Chandra uncovered a large population of unidentified sources, possibly CVs. NuSTAR should detect hundreds of these sources in the hard X-ray band, helping identify their nature. A similar survey of the Norma region will be done for comparative studies. NuSTAR will observe Sgr A*, in coordination with Chandra and other observatories, to search for hard X-ray flaring. The same observations will provide an image of the central few tens of parsecs of the Galaxy with more than an order of magnitude better sensitivity than INTEGRAL. NuSTAR will spatially resolve the hard X-ray emission in the molecular cloud Sgr B2 to better understand its origin. An observation of the Limiting Window, which holds a possible new class of CVs, will yield information on their nature through the fraction of hard X-ray emitters. NuSTAR’s planned observation of the G2 molecular cloud - Sgr A* infall in the spring of 2013 will be discussed. Finally, with its superb hard X-ray sensitivity, NuSTAR will detect and map the low energy extension of the diffuse gamma-ray background observed by INTEGRAL, helping to resolve the long-standing mystery of the diffuse Galactic X-ray background. For Galactic binaries, NuSTAR's hard X-ray sensitivity will permit detailed studies of the fainter part of this population. NuSTAR will obtain the first hard X-ray measurements of black hole and neutron star transients in and approaching quiescence, providing new insights into how the X-ray emission is produced. NuSTAR will follow up on recently discovered types of High-Mass X-ray Binaries to search for pulsations, cyclotron lines, or spectral breaks, constraining the properties of their compact objects. We also plan to target gamma-ray binaries to understand whether the emission is powered by accretion or neutron star rotation. For bright X-ray binaries, we will use NuSTAR’s superb energy resolution at >10 keV to study cyclotron lines from accreting pulsars and to search for absorption edges in type I X-ray bursts that, if found, provide a new window on neutron star physics.

Hailey, Charles J.; NuSTAR Science Team

2013-01-01

330

Characterizing Star Formation in Galactic Center IRDCs  

NASA Astrophysics Data System (ADS)

The nature of on-going star formation in the nuclear region of our own Milky Way Galaxy is not well understood. While infrared dark clouds (IRDCs), which are known to harbor the early stages of star formation, are found toward the Galactic center, the properties of these particular IRDCs have yet to be studied in detail. We wish to obtain sensitive on-the-fly maps of molecular line emission (using MOPS in broadband mode) to study 7 Galactic center IRDCs. Like Galactic disk IRDCs, these clouds contain cores that appear to be in different evolutionary states. We will compare these new Galactic center IRDC data with previously obtained molecular line emission from Galactic disk IRDC cores. If the properties of the Galactic center IRDC cores are indistinguishable from their Galactic disk counterparts, then star formation in the Galactic center IRDCs may proceed similarly to star formation in Galactic disk IRDCs. If not, however, then the difference could imply that the initial physical conditions for star formation within IRDCS in the Galactic center may by influenced by their unique environment.

Chambers, Edward; Yusef-Zadeh, Farhad

2010-04-01

331

The Bolocam Galactic Plane Survey  

NASA Astrophysics Data System (ADS)

The Bolocam Galactic Plane Survey (BGPS) is a 1.1 mm continuum survey of the northern Galactic Plane made with Bolocam and the Caltech Submillimeter Observatory. The coverage totals 170 square degrees, comprised of a contiguous range from -10.5° ? l ? 90.5°, -0.5° ? b ? 0.5°, with extended coverage in b in selected regions, and four targeted regions in the outer Galaxy, including: IC1396, toward the Perseus arm at l ? 111°, W3/4/5, and Gem OB1. Depths of the maps range from 30 to 60 mJy beam-1. Approximately 8,400 sources were detected and the maps and source catalog have been made publicly available. Millimeter-wave thermal dust emission reveals dense regions within molecular clouds, thus the BGPS serves as a database for studies of the dense interstellar medium and star formation within the Milky Way.

Glenn, J.; Aguirre, J.; Bally, J.; Battersby, C.; Bradley, E. T.; Cyganowski, C.; Dowell, D.; Drosback, M.; Dunham, M. K.; Evans, N. J., II; Ginsburg, A.; Harvey, P.; Rosolowsky, E.; Schlingman, W.; Shirley, Y. L.; Stringfellow, G. S.; Walawender, J.; Williams, J.

2009-12-01

332

Galactic Fountains and Gas Accretion  

NASA Astrophysics Data System (ADS)

Star-forming disc galaxies such as the Milky Way need to accrete >~1 Msolar of gas each year to sustain their star formation. This gas accretion is likely to come from the cooling of the hot corona, however it is still not clear how this process can take place. We present simulations supporting the idea that this cooling and the subsequent accretion are caused by the passage of cold galactic-fountain clouds through the hot corona. The Kelvin-Helmholtz instability strips gas from these clouds and the stripped gas causes coronal gas to condense in the cloud's wake. For likely parameters of the Galactic corona and of typical fountain clouds we obtain a global accretion rate of the order of that required to feed the star formation.

Marinacci, F.; Binney, J.; Fraternali, F.; Nipoti, C.; Ciotti, L.; Londrillo, P.

2010-06-01

333

A nova origin of the gas cloud at the Galactic center?  

NASA Astrophysics Data System (ADS)

The recent discovery by Gillessen and collaborators of a cloud of gas falling towards the Galactic center on a highly eccentric orbit, diving nearly straight into the immediate neighborhood of the central supermassive black hole, raises the important question of its origin. Several models have already been proposed. Here we suggest that a recent nova outburst has ejected a ring-like shell of gas. Viewed at high inclination, that could account for the mass, head and tail structure, and the unusually high eccentricity of the observed cloud in a natural way, even as the nova moves on a quite normal orbit for the young stars in the close neighborhood of the Galactic center. We illustrate this by calculating orbits for the head and tail parts of the ejecta and the nova that has produced it. We briefly discuss some of the questions that this model, if true, raises about the stellar environment close to the Galactic center.

Meyer, F.; Meyer-Hofmeister, E.

2012-10-01

334

Galactic Globular Cluster Relative Ages  

Microsoft Academic Search

Based on a new large, homogeneous photometric database of 34 Galactic globular clusters (GGCs plus Palomar 12), a set of distance- and reddening- independent relative age indicators has been measured. The observed delta(V-I)2.5 and DeltaVHBTO versus metallicity relations have been compared with the relations predicted by two recently updated libraries of isochrones. Using these models and two independent methods, we

A. Rosenberg; I. Saviane; G. Piotto; A. Aparicio; Alejandra Recio-Blanco; Maurizio Salaris

1999-01-01

335

Galactic Fountains as Magnetic Pumps  

NASA Astrophysics Data System (ADS)

We study a simple, kinematical model of a galactic fountain flow and show that a horizontal field in the galactic plane can be pumped into the halo to a height of several kiloparsecs. This pumping effect results from the topological structure of the flow in which the updraughts (represented by hot gas) form a connected network, whereas the downdraughts (associated with isolated cool clouds) are disconnected from each other. Such a flow traps the large-scale magnetic field in the disc and deposits it at the top of the fountain flow. Unlike previously studied models of topological pumping, in our case the flow is not constrained to a closed box and horizontal magnetic flux can leak out at the top. We find significant pumping of mean magnetic field into the halo, which can be parametrized by an advection velocity of order 1-10 km s^-1^. The resulting magnetic field strength at a height of several kiloparsecs above the galactic plane is comparable with that at the base of the flow.

Brandenburg, A.; Moss, D.; Shukurov, A.

1995-09-01

336

Warped Disks and Inclined Rings around Galaxies  

NASA Astrophysics Data System (ADS)

Preface; Acknowledgements; Workshop participants; Group photograph; 1. The intergalactic HI supply F. Briggs; 2. Neutral gas infall into NGC 628 J. Kamphuis and F. Briggs; 3. VLA HI observations of the radio galaxy Centaurus A J. M. van der Hulst, J. H. van Gorkom, A. D. Haschick and A. D. Tubbs; 4. A geometric model for the dust-band of Centaurus A R. A. Nicholson, K. Taylor and J. Bland; 5. The circumgalactic ring of gas in Leo S. E. Schneider; 6. Using gas kinematics to measure M/L in elliptical galaxies T. de Zeeuw; 7. Velocity fields of disks in triaxial potentials P. J. Teuben; 8. Modeling the atomic gas in NGC 4278 J. F. Lees; 9. A few statistics from the catalog of polar-ring galaxies B. C. Whitmore; 10. Dynamics of polar rings L. S. Sparke; 11. Mergers and the structure of disk galaxies L. Hernquist; 12. Formation of polar rings H.-W. Rix and N. Katz; 13. Gas-dynamical models of settling disks D. Christodoulou and J. E. Tohline; 14. Evolutionary processes affecting galactic accretion disks T. Steiman-Cameron; 15. Particle simulations of polar rings T. Quinn; 16. A bending instability in prolate stellar systems D. Merritt; 17. The Milky Way: lopsided or barred? K. Kuijken; 18. Merger origin of starburst galaxies L. Hernquist; 19. Warped and flaring HI disks A. Bosma; 20. Behaviour of warps in extended disks F. Briggs and J. Kamphuis; 21. Observational constraints for the explanation of warps E. Battaner, E. Florido, M.-L. Sanchez-Saavedra and M. Prieto; 22. Warps in S0s: observations versus theories G. Galletta; 23. Warps and bulges J. Pitesky; 24. Time evolution of galactic warps P. Hofner and L. S. Sparke; 25. Are warps normal modes? S. Casertano; 26. Disk warping in a slewing potential E. C. Ostriker; 27. Concluding discussion Moderator: K. C. Freeman; Name index; Object index; Subject index.

Casertano, Stefano; Sackett, Penny D.; Briggs, Franklin H.

2006-11-01

337

Ringing phenomenon of the fiber ring resonator.  

PubMed

A resonator fiber-optic gyro (R-FOG) is a high-accuracy inertial rotation sensor based on the Sagnac effect. A fiber ring resonator is the core sensing element in the R-FOG. When the frequency of the fiber ring resonator input laser is swept linearly with time, ringing of the output resonance curve is observed. The output field of the fiber ring resonator is derived from the superposition of the light transmitted through the directional coupler directly and the multiple light components circulated in the fiber ring resonator when the frequency of the laser is swept. The amplitude and phase of the output field are analyzed, and it is found that the difference in time for different light components in the fiber ring resonator to reach a point of destructive interference causes the ringing phenomenon. Finally the ringing phenomenon is observed in experiments, and the experimental results agree with the theoretical analysis well. PMID:17676092

Ying, Diqing; Ma, Huilian; Jin, Zhonghe

2007-08-01

338

Laurent Polynomial Rings.  

National Technical Information Service (NTIS)

We describe some properties of the Laurent polynomial rings in a finite number of indeterminates over a commutative unitary ring. We study some subrings of the Laurent polynomial rings. We finally obtain two cancellation properties. (Atomindex citation 17...

D. Stefanescu

1985-01-01

339

Absolute E-rings  

Microsoft Academic Search

A ring R with 1 is called an E-ring if EndZR is ring-isomorphic to R under the canonical homomorphism taking the value 1? for any ??EndZR. Moreover R is an absolute E-ring if it remains an E-ring in every generic extension of the universe. E-rings are an important tool for algebraic topology as explained in the introduction. The existence of

Rüdiger Göbel; Daniel Herden; Saharon Shelah

2011-01-01

340

Detection of silicon in the Galactic center  

SciTech Connect

The detection of the forbidden Si II 34.815 micron line in the Galactic center region is reported. It is demonstrated that, in the case of the Galactic center, the emission arises mainly from the photodissociation region and not the shocked molecular component seen via H2, CO, and OH lines. It is also shown that significant Si II emission is not expected from the ionized gas even though the Galactic center is a rather low excitation H II region. 23 references.

Hertier, T.; Houck, J.R.; Graf, P.; Gull, G.E.

1986-10-01

341

Outer structure of the Galactic warp and flare: explaining the Canis Major over-density  

Microsoft Academic Search

Aims.In this paper we derive the structure of the Galactic stellar warp and flare. Methods: .We use 2MASS red clump and red giant stars, selected at mean and fixed heliocentric distances of R&sun;~=3, 7 and 17 kpc. Results: .Our results can be summarized as follows: (i) a clear stellar warp signature is derived for the 3 selected rings, proving that

Y. Momany; S. Zaggia; G. Gilmore; G. Piotto; G. Carraro; L. R. Bedin; F. de Angeli

2006-01-01

342

Exterior surface dust lead, interior house dust lead and childhood lead exposure in an urban environment  

SciTech Connect

The impact of urban lead exposure is being examined in a prospective study of several hundred children followed from birth to five years of age. A wide range of social, behavioral, biological and environmental factors are being assessed at approximately one year intervals beginning at birth. Previous analyses on this cohort have indicated a strong relationship between hand lead and hand-to-mouth activity and suggests that this is an important mechanism of inadvertent ingestion of lead in infants and young children. The present analyses was undertaken to examine the joint influence of lead in exterior surface dust and interior lead-containing painted surfaces on lead levels in house dust. In addition the joint influence of exterior and interior surface dust lead on children's hand lead content and blood lead concentration was examined. At 18 months of age 38% of the observed variation in blood lead was accounted for by hand lead and dust lead. Interior paint lead and exterior surface dust lead accounted for 52% of the observed variation in interior surface dust lead concentration. Exterior surface dust lead, obtained from exterior surface scrapings, indirectly influenced blood lead through its impact on interior house dust lead and children's hand lead content, but had no observable direct impact on blood lead. 13 references, 4 figures, 3 tables.

Bornschein, R.L.; Succop, P.A.; Krafft, K.M.; Clark, C.S.; Peace, B.; Hammond, P.B.

1986-01-01

343

Division VII: the Galactic System  

NASA Astrophysics Data System (ADS)

Division VII provides a forum for astronomers studying the Milky Way Galaxy and its constituents. Several meetings directly relevant to his subject were held at the General Assembly in Rio: IAU Symp. 262 Stellar Populations, IAU Symp. 265 Chemical Abundances in the Universe, IAU Symp. 266 Star Clusters, Joint Discussion 5 Modeling the Milky Way in the Era of Gaia, and Special Session 5 The Galactic Plane. Division VII therefore did not organize a separate science session at Rio, but business meetings were held for both the Division and for Commissions 33 and 37.

Gerhard, Ortwin; Hatzidimitriou, Despina; Whitelock, Patricia A.; Lada, Charles J.; Sarajedini, Ata; Wyse, Rosemary F.; Lazio, Joseph

2010-05-01

344

Interior and exterior sound field control using two dimensional higher-order variable-directivity sources.  

PubMed

Spatial sound reproduction systems aim to produce a desired sound field over a volume of space. At high frequencies, the number of loudspeakers required is prohibitive. This paper shows that the use of loudspeakers with up to Nth order directivity allows reproduction over N times the bandwidth and produces a significantly attenuated exterior sound field. If the constraint on exterior cancellation of the field is removed, reproduction is possible over approximately 2N times the bandwidth. The use of higher order loudspeakers thus allows a significant reduction in the number of loudspeaker units, at the expense of increased complexity in each unit. For completeness, results are included for the generation of an exterior field with or without cancellation of the interior field. PMID:22559357

Poletti, M A; Abhayapala, T D; Samarasinghe, P

2012-05-01

345

New Dust Belts of Uranus: One Ring, Two Ring, Red Ring, Blue Ring  

SciTech Connect

We compare near-infrared observations of the recently discovered outer rings of Uranus with HST results. We find that the inner ring, R/2003 U 2, is red, whereas the outer ring, R/2003 U 1, is very blue. Blue is an unusual color for rings; Saturn's enigmatic E ring is the only other known example. By analogy to the E ring, R/2003 U 1 is probably produced via impacts into the embedded moon Mab, which apparently orbits at a location where non-gravitational perturbations favor the survival and spreading of sub-micron sized dust. R/2003 U 2 more closely resembles Saturn's G ring.

de Pater, I; Hammel, H B; Gibbard, S G; Showalter, M R

2006-02-02

346

Mass Distributions Implying Flat Galactic Rotation Curves  

ERIC Educational Resources Information Center

|The rotational speeds of stars in the disc of a spiral galaxy are virtually independent of the distances of the stars from the centre of the galaxy. In common parlance, the stellar speed versus distance plot known as a galactic rotation curve is by observation typically nearly flat. This observation provides strong evidence that most galactic

Keeports, David

2010-01-01

347

Magnetic field seeding by galactic winds  

Microsoft Academic Search

The origin of intergalactic magnetic fields is still a mystery and several scenarios have been proposed so far: among them, primordial phase transitions, structure-formation shocks and galactic outflows. In this work, we investigate how efficiently galactic winds can provide an intense and widespread `seed' magnetization. This may be used to explain the magnetic fields observed today in clusters of galaxies

Serena Bertone; Corina Vogt; Torsten Enßlin

2006-01-01

348

Intergalactic magnetic field and galactic WARPS  

Microsoft Academic Search

An alternative explanation of galactic warps is proposed, in which the intergalactic magnetic field (IGMF) is responsible for these structures. The model predicts that, to be efficient, the magnetic field must have a direction not much different from 45 deg with the galactic plane. The required values of the field strength are uncertain, of about 10 nG, higher values being

E. Battaner; E. Florido; M. L. Sanchez-Saavedra

1990-01-01

349

Stellar Remnants in Galactic Nuclei: Mass Segregation  

Microsoft Academic Search

The study of how stars distribute themselves around a massive black hole (MBH) in the center of a galaxy is an important prerequisite for the understanding of many galactic-center processes. These include the observed overabundance of point X-ray sources at the Galactic center and the prediction of rates and characteristics of tidal disruptions of extended stars by the MBH and

Marc Freitag; Pau Amaro-Seoane; Vassiliki Kalogera

2006-01-01

350

Transient Radio Sources in the Galactic Center  

Microsoft Academic Search

The estimates of the rate of occurrence of transient radio sources are presented from the NRAO Galactic Plane (GP) survey observations, a program to monitor the sky at 8.35 and 14.35 GHz. The GP survey series is intended to detect short lived radio sources. The transient radio sources near the galactic center are presented and estimates of the rates of

T. M. Freismuth; G. I. Langston; A. H. Minter

2002-01-01

351

A CATALOG OF GALACTIC INFRARED CARBON STARS  

SciTech Connect

We collected almost all of the Galactic infrared carbon stars (IRCSs) from literature published up to the present to organize a catalog of 974 Galactic IRCSs in this paper. Some of their photometric properties in the near-, mid-, and far-infrared are discussed.

Chen, P. S. [National Astronomical Observatories/Yunnan Observatory and Key Laboratory for the Structure and Evolution of Celestial Objects, Chinese Academy of Sciences, Kunming 650011 (China); Yang, X. H., E-mail: iraspsc@yahoo.com.cn, E-mail: yangxh@cqu.edu.cn [Department of Physics, Chongqing University, Chongqing 400044 (China)

2012-02-15

352

The Galactic Bar and Spiral Arms  

Microsoft Academic Search

Evidence has accumulated in the last few years that the Galactic bulge is barred and rotates rapidly. We describe recent work on the structure and dynamics of the Galactic bar and inner disk. Starting with the COBE\\/DIRBE near-infrared surface brightness distribution, we have begun to construct a quantitative model which is to integrate NIR photometry, source count observations, gas kinematics,

O. Gerhard

1998-01-01

353

Variability of Galactic Center Sources  

NASA Astrophysics Data System (ADS)

A broad range of accretion disk models with black hole masses appropriate to the Galactic Center {0.5-3.0 million solar masses} implies variability at the 2-25% level on time scales as short as 10 minutes. As the current literature provides only upper limits for the near-infrared counterpart to the radio source Sgr A*, this proposal endeavors to detect the source as well as observe its variability. An observed light-curve will test general relativistic predictions and will further constrain black hole models. We will search for source flickering by repeated imaging in broadband filters {F160W and F110M} and in [SiVI]. The F160W and F110M filters will provide the best forum for finding a continuum object and establishing its color. The extinction-corrected fluxes can then constrain accretion disk models. [SiVI] is associated with Active Galactic Nuclei, and requires very high densities and temperatures which one would expect in an accretion disk but not in any of the stellar sources in the field.

McCarthy, Donald

1997-12-01

354

Lithium production in galactic flybys  

NASA Astrophysics Data System (ADS)

Unlike 7Li plateau which is expected but observed at a level that is difficult to explain, 6Li observations in low-metallicity halo stars also reveal a plateau which is completely unexpected within the standard picture of 6Li origin in galactic cosmic-ray (GCR) interactions. This indicates the existence of a new Li source, however all considered sources (e.g. supernovae, shocks due to structure-formation etc.) either completely fail to explain the observed abundance or require some fine-tuning. Here we present another possible source of lithium - cosmic rays that arise due to galactic flybys. Gravitational interaction between two galaxies flying by each other could result in large-scale tidal shocks that would give rise to a new cosmic-ray population - tidal cosmic rays. Such cosmic-ray population would increase the 6Li (and 7Li) abundance, but not be accompanied with increase in metallicity or gas content. The details, of course, depend on interacting galaxies. Our preliminary results presented here demonstrate that this could be an important source of lithium in some sites, such is the Small Magellanic Cloud which has experienced close encounters with the Large Magellanic Cloud and the Milky Way during its history.

Prodanovi?, T.; Bogdanovi?, T.; Uroševi?, D.

355

Illuminating the Galactic Dark Matter  

NASA Astrophysics Data System (ADS)

We propose to re-image the HDF in F606W in order to confirm and better determine the proper motions of four MACHO candidates discovered from the comparison of the original December 1995 HDF frames with WFPC2 F814W frames exposed in December 1997. Four very faint, blue, isolated and unresolved objects are found to have substantial proper motion, 52 +/- 10 mas, 102 +/- 14 mas, 46 +/- 10 mas and 69 +/- 11 mas over the two year baseline. Galactic structure models predict a complete absence of normal stars in the color-magnitude range in which these objects are observed. However, these observations are consistent with recently derived models of old hydrogen atmosphere white dwarfs, whose color, contrary to previous expectations, has been shown to be blue. If so, the stars we have detected have ages in the range 10 Gyr --> 14 Gyr. With a correction for the incompleteness of the sample, the number density of such objects is ~ 0.02 pc^-3, or ~ 0.01 msun pc^-3, assuming for their masses a value typical of white dwarfs. Within the uncertainties arising from the small size of the sample, this mass density is sufficient to account for the entire missing Galactic dynamical mass. The present observations aim to confirm this potentially very important finding.

Ibata, Rodrigo

1999-07-01

356

The Chandra Galactic Bulge Survey  

NASA Astrophysics Data System (ADS)

The Chandra Galactic Bulge Survey (GBS) is a shallow but wide survey of two approximately 6x1 degree strips of the Galactic Bulge about a degree above and below the plane. The survey by design targets regions where extinction and crowding are manageable and optical counterparts are accessible to detailed follow-up. Our strategy is based on going deep enough to detect quiescent low-mass X-ray binaries (LMXBs), but no deeper in order to avoid an excess of cataclysmic variables (CVs), while covering a large area to maximize the numbers of recovered objects. The primary goals of the GBS are to test predictions of binary evolutionary models through number counts and period distributions of detected sources, and to greatly expand the sample of LMXBs suitable for detailed optical follow-up including mass determination. We have identified 1234 X-ray sources most with optical counterparts, and expect these to be divided evenly between quiescent LMXBs, magnetic CVs, and R CVn stars, with smaller numbers of other source types. We are actively pursuing multiwavelength follow-up including searches for optical, infrared, and ultraviolet counterparts, measurement of variability, and optical spectroscopy. I will summarize the goals of the project and highlight some of the results obtained so far. This work is supported by the National Science Foundation under Grant No. AST-0908789.

Hynes, Robert I.; Jonker, P. G.; Bassa, C. G.; Nelemans, G.; Steeghs, D.; Torres, M. A. P.; Maccarone, T. J.; Greiss, S.; Clem, J.; Dieball, A.; Mikles, V. J.; Britt, C. T.; Gossen, L.; Collazzi, A. C.; Wijnands, R.; In't Zand, J. J. M.; Mendez, M.; Rea, N.; Kuulkers, E.; Ratti, E. M.; van Haaften, L. M.; Heinke, C.; Ozel, F.; Groot, P. J.; Verbunt, F.

2012-01-01

357

Application of exterior complex scaling to positron-hydrogencollisions including rearrangement  

SciTech Connect

The first application of an exterior complex scaling method to an atomic scattering problem with distinct rearrangement channels is reported. Calculations are performed for positron-hydrogen collisions in an s-wave model employing an electron-positron potential of V{sub 12} = -(8+(r{sub 1}-r{sub 2}){sup 2}){sup 1/2}, using the time-independent propagating exterior complex scaling (PECS) method. This potential has the correct long-range Coulomb tail of the full problem and the results demonstrate that ECS-based methods can accurately calculate scattering, ionization and positronium formation cross sections in this three-body rearrangement collision.

Bartlett, Philip L.; Stelbovics, Andris T.; Rescigno, Thomas N.; McCurdy, C. William

2007-12-06

358

Use of modified smooth exterior scaling method as an absorbing potential and its application  

SciTech Connect

Here, we propose a new complex path to achieve better absorption during the propagation of a wavepacket. In the proposed modified smooth exterior scaling (SES) method, scaling function, {theta}(x), has been chosen as a real function rather than complex (as used in a conventional smooth exterior scaling method). It greatly reduces the artificial reflections from the boundary edges. This modified SES method is applied to study the multiphoton dissociation of H{sub 2}{sup +} in intense laser field. The resonance states are calculated accurately.

Kalita, Dhruba J.; Gupta, Ashish K. [Department of Chemistry, Indian Institute of Technology, Guwahati 781039, Assam (India)

2011-03-07

359

First Principles Study of Double Photoionization of H2 UsingExterior Complex Scaling  

SciTech Connect

Exterior complex scaling provides a practical path forfirst-principles studies of atomic and molecular ionizationproblemssince it avoids explicit enforcement of asymptotic boundary conditionsfor 3-body Coulomb breakup. We have used the method of exterior complexscaling, implemented with both the discrete variable representation andB-splines, to obtain the first-order wave function for molecular hydrogencorresponding to a single photon having been absorbed by a correlatedinitial state. These wave functions are used to construct convergedtriple differential cross sections for double photoionization of alignedH2 molecules.

Rescigno, Thomas N.; Vanroose, Wim; Horner, Daniel A.; Martin,Fernando; McCurdy, C. William

2006-07-21

360

Stationary axisymmetric exteriors for perturbations of isolated bodies in general relativity, to second order  

SciTech Connect

Perturbed stationary axisymmetric isolated bodies, e.g. stars, represented by a matter-filled interior and an asymptotically flat vacuum exterior joined at a surface where the Darmois matching conditions are satisfied, are considered. The initial state is assumed to be static. The perturbations of the matching conditions are derived and used as boundary conditions for the perturbed Ernst equations in the exterior region. The perturbations are calculated to second order. The boundary conditions are overdetermined: necessary and sufficient conditions for their compatibility are derived. The special case of perturbations of spherical bodies is given in detail.

MacCallum, Malcolm A. H.; Mars, Marc; Vera, Rauel [School of Mathematical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS (United Kingdom); Facultad de Ciencias, Universidad de Salamanca, Plaza de la Merced s/n, 37008 Salamanca (Spain); Fisika Teorikoaren Saila, Euskal Herriko Unibertsitatea, 644 P.K. 48080 Bilbo, Basque Country (Spain)

2007-01-15

361

TiRiFiC: Tilted Ring Fitting Code  

NASA Astrophysics Data System (ADS)

Tilted Ring Fitting Code (TiRiFiC) is a prototype computer program to construct simulated (high-resolution) astronomical spectroscopic 3d-observations (data cubes) of simple kinematical and morphological models of rotating (galactic) disks. It is possible to automatically optimize the parameterizations of constructed model disks to fit spectroscopic (3d-) observations via a ?2 minimization. TiRiFiC is currently implemented as an add-on to the Groningen Image Processing System (GIPSY) software package and attempts to provide a method to automatically fit an extended tilted-ring model directly to a data cube.

Józsa, Gyula I. G.; Kenn, Franz; Oosterloo, Thomas A.; Klein, Ulrich

2012-08-01

362

RE-EXAMINING LARSON'S SCALING RELATIONSHIPS IN GALACTIC MOLECULAR CLOUDS  

SciTech Connect

The properties of Galactic molecular clouds tabulated by Solomon et al. (SRBY) are re-examined using the Boston University-FCRAO Galactic Ring Survey of {sup 13}CO J = 1-0 emission. These new data provide a lower opacity tracer of molecular clouds and improved angular and spectral resolution compared with previous surveys of molecular line emission along the Galactic Plane. We calculate giant molecular cloud (GMC) masses within the SRBY cloud boundaries assuming local thermodynamic equilibrium (LTE) conditions throughout the cloud and a constant H{sub 2} to {sup 13}CO abundance, while accounting for the variation of the {sup 12}C/{sup 13}C with galactocentric radius. The LTE-derived masses are typically five times smaller than the SRBY virial masses. The corresponding median mass surface density of molecular hydrogen for this sample is 42 M{sub sun} pc{sup -2}, which is significantly lower than the value derived by SRBY (median 206 M{sub sun} pc{sup -2}) that has been widely adopted by most models of cloud evolution and star formation. This discrepancy arises from both the extrapolation by SRBY of velocity dispersion, size, and CO luminosity to the 1 K antenna temperature isophote that likely overestimates the GMC masses and our assumption of constant {sup 13}CO abundance over the projected area of each cloud. Owing to the uncertainty of molecular abundances in the envelopes of clouds, the mass surface density of GMCs could be larger than the values derived from our {sup 13}CO measurements. From velocity dispersions derived from the {sup 13}CO data, we find that the coefficient of the cloud structure functions, v{sup 0} = {sigma}{sub v}/R {sup 1/2}, is not constant, as required to satisfy Larson's scaling relationships, but rather systematically varies with the surface density of the cloud as {approx}{sigma}{sup 0.5} as expected for clouds in self-gravitational equilibrium.

Heyer, Mark; Krawczyk, Coleman [Department of Astronomy, University of Massachusetts, Amherst, MA 01003-9305 (United States); Duval, Julia; Jackson, James M. [Institute for Astrophysical Research, Boston University, Boston, MA 02215 (United States)], E-mail: heyer@astro.umass.edu

2009-07-10

363

Chemical Evolution and the Galactic Habitable Zone of M31  

NASA Astrophysics Data System (ADS)

We have computed the Galactic Habitable Zones (GHZs) of the Andromeda galaxy (M31) based on the probability of terrestrial planet formation, which depends on the metallicity (Z) of the interstellar medium, and the number of stars formed per unit surface area. The GHZ was obtained from a chemical evolution model built to reproduce a metallicity gradient in the galactic disk, [O/H](r)=-0.015 dex kpc^{-1} × r(kpc) + 0.44 dex. If we assume that Earth-like planets form with a probability law that follows the Z distribution shown by stars with detected planets, the most probable GHZ per pc^2 is located between 3 and 7 kpc for planets with ages between 6 and 7 Gyr. However, the highest number of stars with habitable planets is located in a ring between 12 and 14 kpc with a mean age of 7 Gyr. 11% and 6.5% of the all formed stars in M31 may have planets capable of hosting basic and complex life, respectively.

Carigi, L.; García-Rojas, J.; Meneses-Goytia, S.

2013-10-01

364

Optimizing Thomson's jumping ring  

NASA Astrophysics Data System (ADS)

The height to which rings will jump in a Thomson jumping ring apparatus is the central question posed by this popular lecture demonstration. We develop a simple time-averaged inductive-phase-lag model for the dependence of the jump height on the ring material, its mass, and temperature and apply it to measurements of the jump height for a set of rings made by slicing copper and aluminum alloy pipe into varying lengths. The data confirm a peak jump height that grows, narrows, and shifts to smaller optimal mass when the rings are cooled to 77 K. The model explains the ratio of the cooled/warm jump heights for a given ring, the reduction in optimal mass as the ring is cooled, and the shape of the mass resonance. The ring that jumps the highest is found to have a characteristic resistance equal to the inductive reactance of the set of rings.

Tjossem, Paul J. H.; Brost, Elizabeth C.

2011-04-01

365

Facility S786, exterior oblique view of west side, Facility 5 ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Facility S786, exterior oblique view of west side, Facility 5 and tower beyond on right, Facility S17A shed on right, view facing southeast - U.S. Naval Base, Pearl Harbor, Dry Dock No. 1, Pumpwell, By-Pass Valve & Saltwater Pumphouse, North end of Fifth Street, between Dry Dock No. 1 & Facility GD2 , Pearl City, Honolulu County, HI

366

1. EAST SIDE/NORTH END EXTERIOR OF RUSH CREEK POWERHOUSE SHOWING ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EAST SIDE/NORTH END EXTERIOR OF RUSH CREEK POWERHOUSE SHOWING ROLLING METAL DOOR ON NORTH END, SWITCHRACKS NORTH OF POWERHOUSE AND WORKER COTTAGES IN COMPLEX. VIEW TO SOUTHWEST. - Rush Creek Hydroelectric System, Powerhouse Exciters, Rush Creek, June Lake, Mono County, CA

367

AFFECTIVE EVALUATIONS OF AND REACTIONS TO EXTERIOR AND INTERIOR VEHICLE AUDITORY QUALITY  

Microsoft Academic Search

Affective reactions to and evaluations of auditory stimuli are fundamental components of human perception. In three experiments, participants rated their affective reactions (how pleasant I feel) and preferences for these affective reactions (how much I like the way I feel) as well as affective evaluations (how pleasant the sound is) to interior and exterior binaurally recorded vehicle sounds varying in

D. Västfjäll; M.-A. GULBOL; M. Kleiner; T. Gärling

2002-01-01

368

Study of the spatial object’s exterior attitude measurement based on multi-linear CCD  

Microsoft Academic Search

To overcome the conflict between the speed and the accuracy with area image sensors are used for attitude measurement, an exterior attitude measurement with nine linear CCD cameras combination for spatial object is presented. The attitude angle of the measured object is determined by the spatial solution while the coordinate reconstruction is separately carried on by three subsystems for 3D

Lili Ai; Feng Yuan; Zhenliang Ding

2008-01-01

369

LPT. Shield test facility (TAN646) exterior, as modified for EBOR. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

LPT. Shield test facility (TAN-646) exterior, as modified for EBOR. Camera facing northeast. Heat exchange fans, helium storage tanks, and completed EBOR perimeter road. Photographer: Page Comisky. Date: ca. August 20, 1965. INEEL negative no. 65-4328 - Idaho National Engineering Laboratory, Test Area North, Scoville, Butte County, ID

370

Exterior direct detail view of 2nd floor balcony at west ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior direct detail view of 2nd floor balcony at west side of Building 6, showing curved concrete rail and tapered concrete column, looking north - North Beach Place, 401 Bay Street, 500 Francisco Street, 401 Bay Street, 500 Francisco Street, San Francisco, San Francisco County, CA

371

1. EXTERIOR VIEW OF 1103 TROUP STREET FROM WEST/NORTHWEST. THIS ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW OF 1103 TROUP STREET FROM WEST/NORTHWEST. THIS STRUCTURE WAS BUILT AS WORKER HOUSING FOR THE HILLSIDE COTTON MILL BUILT BY CALLAWAY MILLS IN SOUTHWEST LaGRANGE, 1914-15. - 1103 Troup Street (House), 1103 Troup Street, La Grange, Troup County, GA

372

VIEW OF STATION SAXTON FACING NORTHEAST, SHOWING EXPOSED EXTERIOR,FRONT AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

VIEW OF STATION SAXTON FACING NORTHEAST, SHOWING EXPOSED EXTERIOR,FRONT AND RIGHT SIDE OF THE CONCRETE CONCEALMENT. THE VISIBLE SANDSTONE FLANK-WALL ILLUSTRATES THE TYPICAL RELATIONSHIP OF THE FLANK WALLS TO THE VIEW APERTURE - White's Point Reservation, Base End Stations, B"2, Bounded by Voyager Circle & Mariner Drive, San Pedro, Los Angeles County, CA

373

EXTERIOR VIEW LOOKING NORTH/NORTHEAST WITH PUMPHOUSE IN THE CENTER BACKGROUND. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

EXTERIOR VIEW LOOKING NORTH/NORTHEAST WITH PUMPHOUSE IN THE CENTER BACKGROUND. PIPING IN LEFT FOREGROUND CARRIES GAS FROM OTHER EQUITABLE FACILITIES THAT IS BEING PUMPED ALONG THE EQUITABLE SYSTEM BY THE BURNSVILLE STATION. - Burnsville Natural Gas Pumping Station, Saratoga Avenue between Little Kanawha River & C&O Railroad line, Burnsville, Braxton County, WV

374

Exterior view looking north/northeast with pumphouse in the center background. ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

Exterior view looking north/northeast with pumphouse in the center background. Piping in left foreground carries gas from other equitable facilities that is being pumped along the equitable system by the Burnsville Station. - Burnsville Natural Gas Pumping Station, Saratoga Avenue between Little Kanawha River & C&O Railroad line, Burnsville, Braxton County, WV

375

Finite element methods for the Helmholtz equation in an exterior domain - Model problems  

Microsoft Academic Search

Finite element methods are presented for the reduced wave equation in unbounded domains. Model problems of radiation with inhomogeneous Neumann boundary conditions, including the effects of a moving acoustic medium, are examined for the entire range of propagation and decay. Exterior boundary conditions for the computational problem over a finite domain are derived from an exact relation between the solution

Isaac Harari; Thomas J. R. Hughes

1991-01-01

376

Sustainable wall construction and exterior insulation retrofit technology process and structure  

DOEpatents

A low-cost process for exterior wall insulation retrofit, or new wall construction by stacking layers of fabric tube filled with insulating material against a wall and covering them with mesh and stucco provides a durable structure with good insulating value.

Vohra, Arun (Bethesda, MD)

2000-01-01

377

Measurement of the exterior convective film coefficient for windows in low-rise buildings.  

National Technical Information Service (NTIS)

The MoWiTT field facility is used to measure the convective film coefficient over the exterior surface of a window. The MoWiTT-measured data is compared to some commonly-used experimental and theoretical models. The comparison shows that the MoWiTT data d...

M. Yazdanian J. H. Klems

1993-01-01

378

A&M. Jet engine test building (TAN609). Exterior. Equipment inside rollup ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

A&M. Jet engine test building (TAN-609). Exterior. Equipment inside roll-up door is blowdown test facility, part of loft-semiscale program. Note width of central section serving as blast protection for operator on left side. Photographer: Cahoon. Date: July 22, 1965. INEEL negative no. 65-3703 - Idaho National Engineering Laboratory, Test Area North, Scoville, Butte County, ID

379

19. EXTERIOR VIEW OF BUILDING 24A (POWER BUILDING), LOOKING NORTH ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

19. EXTERIOR VIEW OF BUILDING 24A (POWER BUILDING), LOOKING NORTH (1991). - Wright-Patterson Air Force Base, Area B, Buildings 25 & 24,10-foot & 20-foot Wind Tunnel Complex, Northeast side of block bounded by K, G, Third, & Fifth Streets, Dayton, Montgomery County, OH

380

Study on the initial value for the exterior orientation of the mobile version  

Microsoft Academic Search

Single mobile vision coordinate measurement system is in the measurement site using a single camera body and a notebook computer to achieve three-dimensional coordinates. To obtain more accurate approximate values of exterior orientation calculation in the follow-up is very important in the measurement process. The problem is a typical one for the space resection, and now studies on this topic

Zhi-Jing Yu; Shi-Liang Li

2011-01-01

381

Two-photon double ionization of H2 using exterior complex scaling  

SciTech Connect

We report converged calculations of fully, singly differential and total cross sections for two-photon double ionization of the hydrogen molecule in the range of 26-30 eV. These results have been obtained by using the method of exterior complex scaling combined with the use of DVR basis set.

Horner, Daniel A [Los Alamos National Laboratory; Morales, F [UNIV AUTONOMA DE MADRID; Martin, F [UNIV AUTONOMA DE MADRID; Rescigno, T N [LBNL; Mccurdy, C W [LBNL

2009-01-01

382

Applying decision analysis process to exterior physical security system technology design and selection  

Microsoft Academic Search

Developing and evaluating exterior physical security system alternatives can be a daunting task. Once alternatives are identified, they must be evaluated not to only the set of threats they provide against, but also to other factors such as cost, performance, schedule and environmental impact. This article describes a systematic approach of applying decision analysis tools and techniques to develop, and

Han Lin; David Burnett; Don Sheaffer; Eric Arnold

2009-01-01

383

2. EXTERIOR VIEW OF BUILDING 25B (TEST CHAMBER BUILDING) AND ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

2. EXTERIOR VIEW OF BUILDING 25B (TEST CHAMBER BUILDING) AND WIND TUNNEL, LOOKING NORTHWEST (1991). - Wright-Patterson Air Force Base, Area B, Buildings 25 & 24,10-foot & 20-foot Wind Tunnel Complex, Northeast side of block bounded by K, G, Third, & Fifth Streets, Dayton, Montgomery County, OH

384

1. EXTERIOR VIEW OF BUILDING 25A (COLD CHAMBER), LOOKING NORTHEAST, ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

1. EXTERIOR VIEW OF BUILDING 25A (COLD CHAMBER), LOOKING NORTHEAST, WITH WIND TUNNEL IN BACKGROUND (1991). - Wright-Patterson Air Force Base, Area B, Buildings 25 & 24,10-foot & 20-foot Wind Tunnel Complex, Northeast side of block bounded by K, G, Third, & Fifth Streets, Dayton, Montgomery County, OH

385

The Moon's influence on the location of the Sun-Earth exterior libration point  

Microsoft Academic Search

If the Sun and Earth were isolated in space, the exterior libration point (Lz) of this two-body system would always lie on a line passing through their centers. However, it will be shown below that when the gravitational field of the Moon is taken into account, it is more accurate to place this point on a line that passes through

Robert W. Farquhar

1970-01-01

386

Model for Naturally Ventilated Cavities on the Exteriors of Opaque Building Thermal Envelopes  

SciTech Connect

This paper describes a model for naturally ventilated cavities on the exterior of opaque building thermal envelopes that are formed by the presence of a lightweight baffle. The model can be used for building components that are slightly detached from the main envelope (but do not connect to the interior).

Griffith, B.

2006-11-01

387

24. EXTERIOR VIEW OF BUILDING 24C (SHOP AND ENGINEERING BUILDING), ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

24. EXTERIOR VIEW OF BUILDING 24C (SHOP AND ENGINEERING BUILDING), LOOKING NORTHWEST (1991). - Wright-Patterson Air Force Base, Area B, Buildings 25 & 24,10-foot & 20-foot Wind Tunnel Complex, Northeast side of block bounded by K, G, Third, & Fifth Streets, Dayton, Montgomery County, OH

388

20. EXTERIOR WEST VIEW, SHOWING CRANE SYSTEM (1991). WrightPatterson ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

20. EXTERIOR WEST VIEW, SHOWING CRANE SYSTEM (1991). - Wright-Patterson Air Force Base, Area B, Buildings 25 & 24,10-foot & 20-foot Wind Tunnel Complex, Northeast side of block bounded by K, G, Third, & Fifth Streets, Dayton, Montgomery County, OH

389

25. EXTERIOR WEST VIEW OF STORAGE TANK (1991). WrightPatterson ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

25. EXTERIOR WEST VIEW OF STORAGE TANK (1991). - Wright-Patterson Air Force Base, Area B, Buildings 25 & 24,10-foot & 20-foot Wind Tunnel Complex, Northeast side of block bounded by K, G, Third, & Fifth Streets, Dayton, Montgomery County, OH

390

Galactic and intergalactic Faraday rotation  

NASA Astrophysics Data System (ADS)

A model of the systematic component of the magnetic field of the Galaxy is fitted to a sample of 459 extragalactic rotation measures (RM), and the results are found to be consistent with a previous analysis of pulsar RMs by Thomson and Nelson (1980). The model is then used to reduce the effect of galactic Faraday rotation on the RMs of 134 QSOs, and the results used to investigate the existence of a Faraday-active intergalactic medium. Three models are considered in order to explain the redshift dependence of the RM variance. Although none of these models can be excluded, a significant fraction of the observed Faraday rotation may take place in extended cluster/supercluster haloes with dimensions about 9 Mpc, electron densities about 0.0001/cu cm and magnetic fields about 0.1-1 microgauss. The inferred filling-factor, about 0.002, implies omega of about 0.1.

Thomson, R. C.; Nelson, A. H.

1982-10-01

391

The galactic model of GRBs  

SciTech Connect

The galactic model of gamma ray bursts (GRBs) is based upon the observed production of soft gamma ray repeaters (SGRs) in the galaxy and the consequences of a reasonable model to explain them. In this view GRBs are the long term result of the burn-out conditions of the SGRs in this and in other galaxies. A delay of {approximately} 30 million years before GRBs are being actively produced can be understood as the time required for the ejected matter during the SGR phase to cool, condense, and form planetesimals that are eventually captured by the central neutron star. The amount of disk matter and the interaction between each GRB and the disk determine the rate of burst production and turn-off time of GRBs. The x-ray afterglow as well as optical emission is derived from x-ray fluorescence and ionization of previously ablated matter.

Colgate, S.A.; Li, H.

1997-09-01

392

The Galactic evolution of phosphorus  

NASA Astrophysics Data System (ADS)

Context. As a galaxy evolves, its chemical composition changes and the abundance ratios of different elements are powerful probes of the underlying evolutionary processes. Phosphorous is an element whose evolution has remained quite elusive until now, because it is difficult to detect in cool stars. The infrared weak P i lines of the multiplet 1, at 1050-1082 nm, are the most reliable indicators of the presence of phosphorus. The availability of CRIRES at VLT has permitted access to this wavelength range in stellar spectra. Aims: We attempt to measure the phosphorus abundance of twenty cool stars in the Galactic disk. Methods: The spectra are analysed with one-dimensional model-atmospheres computed in local thermodynamic equilibrium (LTE). The line formation computations are performed assuming LTE. Results: The ratio of phosphorus to iron behaves similarly to sulphur, increasing towards lower metallicity stars. Its ratio with respect to sulphur is roughly constant and slightly larger than solar, [P/S] = 0.10 ± 0.10. Conclusions: We succeed in taking an important step towards the understanding of the chemical evolution of phosphorus in the Galaxy. However, the observed rise in the P/Fe abundance ratio is steeper than predicted by Galactic chemical evolution model developed by Kobayashi and collaborators. Phosphorus appears to evolve differently from the light odd-Z elements sodium and aluminium. The constant value of [P/S] with metallicity implies that P production is insensitive to the neutron excess, thus processes other than neutron captures operate. We suggest that proton captures on 30Si and ? captures on 27Al are possibilities to investigate. We see no clear distinction between our results for stars with planets and stars without any detected planet. Based on observations obtained with the CRIRES spectrograph at ESO-VLT Antu 8.2 m telescope at Paranal, Programme 386.D-0130, P.I. E. Caffau.

Caffau, E.; Bonifacio, P.; Faraggiana, R.; Steffen, M.

2011-08-01

393

PREFACE: Galactic Center Workshop 2006  

NASA Astrophysics Data System (ADS)

We are pleased to present the proceedings from the Galactic Center Workshop 2006—From the Center of the Milky Way to Nearby Low-Luminosity Galactic Nuclei. The conference took place in the Physikzentrum, Bad Honnef, Germany, on 18 to 22 April 2006. It is the third workshop of this kind, following the Galactic Center Workshops held 1998 in Tucson, Arizona, and 2002 in Kona, Hawaii. The center of the Milky Way is the only galactic nucleus of a fairly common spiral galaxy that can be observed in great detail. With a distance of roughly 8 kpc, the resolution that can currently be achieved is of the order 40 mpc/8000 AU in the X-ray domain, 2 mpc/400 AU in the near-infrared, and 0.01 mpc/1 AU with VLBI in the millimeter domain. This is two to three orders of magnitude better than for any comparable nearby galaxy, making thus the center of the Milky Way thetemplate object for the general physical interpretation of the phenomena that can be observed in galactic nuclei. We recommend the summary article News from the year 2006 Galactic Centre workshopby Mark Morris and Sergei Nayakshin—who also gave the summary talk of the conference—to the reader in order to obtain a first, concise overview of the results presented at the workshop and some of the currently most exciting—and debated—developments in recent GC research. While the workshops held in 1998 and 2002 were dedicated solely to the center of the Milky Way, the field of view was widened in Bad Honnef to include nearby low-luminosity nuclei. This new feature followed the realization that not only the GC serves as a template for understanding extragalactic nuclei, but that the latter can also provide the context and broader statistical base for understanding the center of our Milky Way. This concerns especially the accretion and emission processes related to the Sagittarius A*, the manifestation of the super massive black hole in the GC, but also the surprising observation of great numbers of massive, young stars in an environment that was previously thought hostile to star formation. Highlights of the GC Workshop 2002 in Kona were certainly the extraordinary evidence for the black hole nature of Sagittarius A* provided by the observation of orbits of individual stars around the central dark mass of the Milky Way, and the observations of short radiation outbreaks from Sgr A* in the X-ray regime, the so-called flares. These events with their variability on the minute time scale provided additional hard evidence for the black hole nature of Sgr A*. Also, the new observational capabilities provided by Chandraand XMMprovided spectacular new insights into the physics of the GC. With the black hole nature of Sagittarius A* now confirmed beyond reasonable doubt, theory and observation are zooming into ever smaller scales, trying to understand the exact physics behind the extreme under-luminosity (10-9 10-10 in terms of Eddington luminosity) of Sagittarius A*. Especially observations of the submm, NIR, and X-ray flares appear to be promising sources to analyze the accretion physics of Sagittarius A* near its event horizon. Some flares may carry the actual imprint of plasma moving at relativistic velocities near the last orbit of the black hole. Another topic that has moved into the focus of attention is star formation near the central black hole. One, possibly two, disks of young massive stars in the central half parsec, generally assumed hostile to star formation, challenge current theories of star formation. Through new infrared integral field spectrometers there is now strong evidence that the stars in the immediate environment of Sagittarius A*, the so-called S-stars are B-type main sequence stars. There are many hypothesis for their origin, but no model could yet provide entirely satisfactory explanations for their existence. A significant number of new telescopes and instruments access ever greater detail at all wavelengths. The continuing development of (sub)-millimeter instrumentation, for example, provides high spatial resolution as well as important spectroscopic d

Schödel, Rainer; Bower, Geoffrey C.; Muno, Michael P.; Nayakshin, Sergei; Ott, Thomas

2006-12-01

394

Barrier Ring Injector.  

National Technical Information Service (NTIS)

The patent application relates to a rocket engine injector device including three flanged concentric annular members and a manifold ring assembled to provide the high injection density required for barrier cooling. The barrier ring assembly includes an in...

K. Y. Wong

1972-01-01

395

Reasoning about rings  

Microsoft Academic Search

The ring is a useful means of structuring concurrent processes. Processes communicate by passing a token in a fixed direction; the process that possesses the token is allowed to make certain moves. Usually, correctness properties are expected to hold irrespective of the size of the ring. We show that the problem of checking many useful correctness properties for rings of

E. Allen Emerson; Kedar S. Namjoshi

1995-01-01

396

Rings Around Uranus  

ERIC Educational Resources Information Center

Events leading up to the discovery of the rings of Uranus are described. The methods used and the logic behind the methods are explained. Data collected to prove the existence of the rings are outlined and theories concerning the presence of planetary rings are presented. (AJ)

Maran, Stephen P.

1977-01-01

397

Rings Around Uranus  

ERIC Educational Resources Information Center

|Events leading up to the discovery of the rings of Uranus are described. The methods used and the logic behind the methods are explained. Data collected to prove the existence of the rings are outlined and theories concerning the presence of planetary rings are presented. (AJ)|

Maran, Stephen P.

1977-01-01

398

The Jumping Ring Experiment  

ERIC Educational Resources Information Center

|The jumping ring experiment has become central to liquid nitrogen shows given as part of the outreach and open day activities carried out within the University of Bath. The basic principles of the experiment are described as well as the effect of changing the geometry of the rings and their metallurgical state. In general, aluminium rings are…

Baylie, M.; Ford, P. J.; Mathlin, G. P.; Palmer, C.

2009-01-01

399

The Rings of Saturn.  

National Technical Information Service (NTIS)

Present-day knowledge of Saturn's rings is reviewed. The results of observations of Saturn's rings are analyzed in detail, and conclusions as to the nature of the rings are formulated. Particular attention is given to the quantitative theory of change in ...

M. S. Bobrov

1972-01-01

400

H II REGION DRIVEN GALACTIC BUBBLES AND THEIR RELATIONSHIP TO THE GALACTIC MAGNETIC FIELD  

SciTech Connect

The relative alignments of mid-infrared traced Galactic bubbles are compared to the orientation of the mean Galactic magnetic field in the disk. The orientations of bubbles in the northern Galactic plane were measured and are consistent with random orientations-no preferential alignment with respect to the Galactic disk was found. A subsample of H II region driven Galactic bubbles was identified, and as a single population they show random orientations. When this subsample was further divided into subthermal and suprathermal H II regions, based on hydrogen radio recombination linewidths, the subthermal H II regions showed a marginal deviation from random orientations, but the suprathermal H II regions showed significant alignment with the Galactic plane. The mean orientation of the Galactic disk magnetic field was characterized using new near-infrared starlight polarimetry and the suprathermal H II regions were found to preferentially align with the disk magnetic field. If suprathermal linewidths are associated with younger H II regions, then the evolution of young H II regions is significantly affected by the Galactic magnetic field. As H II regions age, they cease to be strongly linked to the Galactic magnetic field, as surrounding density variations come to dominate their morphological evolution. From the new observations, the ratios of magnetic-to-ram pressures in the expanding ionization fronts were estimated for younger H II regions.

Pavel, Michael D.; Clemens, D. P., E-mail: pavelmi@bu.edu, E-mail: clemens@bu.edu [Institute for Astrophysical Research, Boston University, 725 Commonwealth Ave., Boston, MA 02215 (United States)

2012-12-01

401

Accurate proper motions of Galactic halo populations  

NASA Astrophysics Data System (ADS)

We propose to use the superb spatial resolution of the WFPC2 camera to obtain second epoch exposures in the fields of several Galactic halo globular clusters and dwarf satellite galaxies. The proper motions of these populations will thereby be determined to unprecedented accuracy, approximately an order of magnitude better than has been previously possible. This will improve our understanding of the shape and distribution of the dark matter halo of the Milky Way, it will allow better scrutiny of formation models of the halo, it will allow us to investigate the dynamical evolution of the Galactic satellites, and it will help constrain the dynamics of foreground Galactic components. Stellar populations studies of the Galactic halo objects can be {in some cases, substantially} improved, since contaminants from foreground stellar populations and background galaxian populations will be excluded from color-magnitude diagrams and luminosity functions. Furthermore, we may also discover high redshift supernovae.

Ibata, Rodrigo

1999-07-01

402

Filamentary Structures Near the Galactic Center  

NASA Astrophysics Data System (ADS)

For summary of scientific results, see the following references: Yusef-Zadeh, F. ``Filamentary Structures Near the Galactic Center,'' 1989, Proceedings of the IAU Symposium no. 136 on The Center of the Galaxy, ed. Mark Morris, pp. 243-263. Yusef-Zadeh, F. and Morris, M., ``The Northern Extension of the Radio Arc Near the Galactic Center,'' 1988 , Ap.J., 329, pp. 729-738. Yusef-Zadeh, F., and Morris, M., ``G0.18-0.04: Interaction of Thermal and Nonthermal Radio Structures in the Arc Near the Galactic Center,'' 1987, A.J., 94, pp. 1178-1184. Yusef-Zadeh, F. and Morris, M., ``The Linear Filaments of the Radio Arc Near the Galactic Center,'' 1987, Ap.J., 322, pp. 721-728. For detailed description of the observations, see the Appendix of: Yusef-Zadeh, F., and Morris, M. 1987, ApJ, 320, 545.

Yusef-Zadeh, Farhad; Morris, Mark

1995-06-01

403

Dark matter particles in the galactic halo  

SciTech Connect

Arguments on the investigation of the DarkMatter particles in the galactic halo are addressed. Recent results obtained by exploiting the annual modulation signature are summarized and the perspectives are discussed.

Bernabei, R., E-mail: rita.bernabei@roma2.infn.it; Belli, P.; Montecchia, F.; Nozzoli, F. [Universita di Roma 'Tor Vergata' and INFN, Sezione di Roma 'Tor Vergata', Dipartimento di Fisica (Italy); Cappella, F.; D'Angelo, A.; Incicchitti, A.; Prosperi, D. [Universita di Roma 'La Sapienza' and INFN, Sezione di Roma, Dipartimento di Fisica (Italy); Cerulli, R. [INFN, Laboratori Nazionali del Gran Sasso (Italy); Dai, C. J.; He, H. L.; Kuang, H. H.; Ma, J. M.; Sheng, X. D.; Ye, Z. P. [Chinese Academy, IHEP (China)

2009-12-15

404

Probing the Canis Major stellar over-density as due to the Galactic warp  

NASA Astrophysics Data System (ADS)

Proper-motion, star counts and photometric catalog simulations are used to explain the detected stellar over-density in the region of Canis Major, claimed to be the core of a disrupted dwarf galaxy (CMa, Martin et al. \\cite{martin04}, MNRAS, 348, 12; Bellazzini et al. \\cite{luna04}, [arXiv:astro-ph/0311119]), as due to the Galactic warp and flare in the external disk. We compare the kinematics of CMa M-giant selected sample with surrounding Galactic disk stars in the UCAC2 catalog and find no peculiar proper motion signature: CMa stars mimic thick disk kinematics. Moreover, when taking into account the Galactic warp and flare of the disk, 2MASS star count profiles reproduce the CMa stellar over-density. This star count analysis is confirmed by direct comparison with synthetic color-magnitude diagrams simulated with the Besançon models (Robin et al. \\cite{robin03}, A&A, 409, 523) that include the warp and flare of the disk. The presented evidence casts doubt on the identification of the CMa over-density as the core of a disrupted Milky Way satellite. This however does not make clear the origin of over-densities responsible for the ring structure in the anticenter direction of the Galactic halo (Newberg et al. \\cite{newberg02}, ApJ, 569, 245; Yanny et al. 2003, ApJ, 588, 824).

Momany, Y.; Zaggia, S. R.; Bonifacio, P.; Piotto, G.; De Angeli, F.; Bedin, L. R.; Carraro, G.

2004-07-01

405

On stellar streaming motions in triaxial objects - The case of the Galactic center  

NASA Astrophysics Data System (ADS)

The stellar dynamical consequences of assuming that the tilted ring of H I gas at about r = 1.5 kpc is in a steady state are explored. It is shown that this implies that the Galactic bulge is triaxial and counterrotating with respect to the disk. Two self-consistent models for a bulge in a realistic Galactic potential are obtained by means of a modification of Schwarzschild's (1979) method. It is concluded that it is not possible to construct a realistic triaxial object such that figure rotation and the matter streaming have opposite signs in an inertial reference frame. Observations of planetary nebulae and OH/IR stars in the Galactic center do not favor a model in which the bulge stars rotate in the direction opposite to that of the disk material. These findings make it unlikely that the 22 deg tilt of the H I ring at r = 1.5 kpc can be explained in terms of the tilted stable retrograde anomalous orbits in a rotating triaxial bulge.

Vietri, M.

1986-07-01

406

Morphology of Gas in the Galactic Center from Spectroscopy of H_3^+  

NASA Astrophysics Data System (ADS)

Over the last several years our observations of the infrared spectrum of H_3^+ toward the Galactic center (GC) have established a high ionization rate (? > 2 × 10-15 s-1) and the existence of a vast amount of warm (T ˜250 K) and diffuse (n < 100 cm-3) gas with a high volume filling factor (f > 0.3) in the Central Molecular Zone (CMZ) of the GC, a region of radius ˜150 pc. These findings are gradually being assimilated into the astrophysics of the GC. Determining the morphology of this gas is difficult because the sightlines for study are limited by the uncontrollable locations of background stars suitable for spectroscopy of H_3^+. There are wide longitudinal gaps in the locations of those stars and the precise radial locations of the stars within the CMZ are uncertain. Nevertheless, the velocity profiles of the observed H_3^+ spectra indicate the presence of the Expanding Molecular Ring (EMR), a structure containing mostly diffuse gas expanding from the center with velocities of up to 180 km s-1 and bordering the CMZ. On the other hand, the 120 pc Molecular Ring, an inner t ring of cold dust and dense gas with radius ˜100 pc is not clearly seen in H_3^+. This is possibly because the sightlines that we have observed to date lie close to the Galactic plane and miss the ring, which goes above and below the Galactic plane. Oka, T., Geballe, T.R., Goto, M., Usuda, T., McCall, B.J. 2005, ApJ, 632, 882 Goto, Usuda, Nagata, Geballe, McCall, Indriolo, Suto, Henning, Morong, and Oka, 2008, ApJ, 688, 306. Geballe, T.R. and Oka, T. 2010, ApJ, 709, L70 Sofue, Y. 1995, PASJ, 47, 527 Molinari, S. et al. 2011, ApJ, 735, L33.

Oka, Takeshi; Geballe, Thomas R.; Indriolo, Nick; Goto, Miwa

2012-06-01

407

Galactic O Stars (Cruz-Gonzalez+ 1974)  

NASA Astrophysics Data System (ADS)

The catalog is a compilation of published data for 644 galactic O stars of luminosity V. The catalog is intended to be useful to O-type star observers by providing a reference list for general studies on O-type stars. The catalog includes cross identifications, equatorial and galactic coordinates, visual or photographic magnitudes, B-V, spectral types, distances to the stars, radial velocities, H II region identifications, remarks, and notes. (2 data files).

Cruz-Gonzalez, C.; Recillas-Cruz, E.; Costero, R.; Peimbert, M.

1995-06-01

408

Massive Star Formation in the Galactic Center  

Microsoft Academic Search

The Galactic center is a hotbed of star formation activity, containing the\\u000amost massive star formation site and three of the most massive young star\\u000aclusters in the Galaxy. Given such a rich environment, it contains more stars\\u000awith initial masses above 100 \\\\Msun than anywhere else in the Galaxy. This\\u000areview concerns the young stellar population in the Galactic

Don F. Figer

2008-01-01

409

Galactic Cosmic Rays and the Environment  

Microsoft Academic Search

SH.3.6.14 Galactic Cosmic Rays and the Environment G. Cini Castagnoli, G. Bonino, P. Della Monica, C. Taricco Istituto di Cosmogeofisica, CNR, Corso Fiume 4, 10133 Torino, Italy and Dipartimento di Fisica Generale, Università di Torino, Via P. Giuria 1, 10125 Torino Recently Svensmark and Friis-Christensen (1997) reported an indication that the Galactic Cosmic Rays (GCR) modulated by the solar wind

G. Cini Castagnoli

1999-01-01

410

Volume-Limited Dependent Galactic Model Parameters  

NASA Astrophysics Data System (ADS)

We estimate 34 sets of Galactic model parameters for three intermediate-latitude fields with Galactic longitudes l = 60°, l = 90°, and l = 180°, and we discussed their dependence on the volume. Also, we confirm the variation of these parameters with absolute magnitude and Galactic longitude. The star samples in two fields are restricted with bright and unit absolute-magnitude intervals, 4 < Mg <= 5, and 5 < Mg <= 6, whereas for the third field (l = 60°) a larger absolute-magnitude interval is adopted, 4 < Mg <= 10. The limiting apparent magnitudes of the star samples are g0 = 15 and g0 = 22.5 mag, which provide space densities within distances in the line of sight of ~0.9 and 25 kpc. The Galactic model parameters for the thin disc are not volume dependent. However, the ones for the thick disc and halo do show spectacular trends in their variation with volume, except for the scalelength of the thick disc. The local space density of the thick disc increases, whereas the scaleheight of the same Galactic component decreases monotonically. However, both model parameters approach asymptotic values at large distances. The relative local space density of the halo estimated by fitting the density laws to the space densities evaluated for all volumes is constant, except for the small ones. However it is absolute-magnitude and Galactic longitude dependent. The axial ratio of the halo increases abruptly for the volumes where a thick disc is dominant, whereas it approaches an asymptotic value gradually for larger volumes, indicating a continuous transition from a disc-like structure to a spherical one at the outermost region of the Galaxy. The variation of the Galactic model parameters with absolute magnitude can be explained by their dependence on the stellar luminosity, whereas the variation with volume and Galactic longitude at short distances is a bias in analysis.

Karaali, S.; Bilir, S.; Yaz, E.; Hamzao?lu, E.; Buser, R.

2007-12-01

411

Stochastic star formation and early galactic nucleosynthesis  

NASA Astrophysics Data System (ADS)

We discuss calculations of the star formation, nucleosynthesis, and stochastic evolution of proto-galactic clouds in a galactic chemical evolution model which is motivated by cold dark matter simulations of hierarchical galaxy formation (Saleh et al. 2006; Lan et al. 2010). We utilize SN-induced and dark matter halo formation-induced star formation within a model that follows the evolution of chemical enrichment and energy input to the clouds via Type II, Ia supernovae and stellar winds.

Nguyen, Lan; Mathews, Grant

2013-03-01

412

The Distance to the Galactic Center  

NASA Astrophysics Data System (ADS)

The Optical Gravitational Lensing Experiment (OGLE) data on high-amplitude ? Scuti Stars (HADS) and RR Lyrae stars have been analyzed to determine the distance to the galactic bulge. We find a mean value of 14.47 +/- 0.08 mag for the bulge distance modulus. A small additive correction leads to 7.9 +/- 0.3 kpc as the best distance to the galactic center.

McNamara, D. H.; Madsen, J. B.; Barnes, J.; Ericksen, B. F.

413

The Galactic thin and thick disk  

NASA Astrophysics Data System (ADS)

The ongoing large spectroscopic surveys of the Milky Way such as SEGUE and RAVE have enabled us to take a fresh look at the structure of the Galactic thin and thick disks, and how their structure fits within the framework of structure formation via hierarchical clustering. In this article I will summarize some recent results mainly based in the RAVE survey with respect to the structure of the Galactic disks, their possible origin as well as indications of substructure and asymmetries.

Steinmetz, M.

2012-06-01

414

Galactic structure, near and far  

NASA Astrophysics Data System (ADS)

We investigate galactic structure in closeby galaxies inside the local group as well as in distant galaxies. In the first chapter, we present a homogeneously selected sample of high resolution R-band images of the central regions of 67 early-type galaxies obtained with the Wide Field and Planetary Camera 2 (WFPC2) aboard the Hubble Space Telescope (HST). We find complex morphologies of the central regions of early-type galaxies which have become apparent from previous studies with HST, in particular various forms of dust, embedded stellar disks, and disk-like structures misaligned with the main galaxy. We analyze the luminosity profiles of the galaxies in our sample, and classify galaxies according to their central cusp slope. To a large extent we confirm the results from previous HST surveys in that early-type galaxies reveal a clear dichotomy: the bright ellipticals (M B ? -20.5) are generally boxy and have luminosity profiles that break from steep outer power-laws to shallow inner cusps (referred to as “core” galaxies). The fainter ellipticals, on the other hand, typically have disky isophotes and luminosity profiles that lack a clear break and have a steep central cusp (referred to as “power- law” galaxies). In the second part of this dissertation we go from the central cores of the galaxies to its outer parts, the halos. The flat rotation curves of late-type galaxies indicate that galaxies possess besides the visible matter an unknown yet gravitationally dominating component called “dark matter” (DM), located in halos which reaches far beyond the visible matter. In recent years, microlensing surveys towards the LMC have found an event rate which can be interpreted as being caused by a lens population of astrophysical dark matter located in the Galactic halo (e.g., Alcock et al., 2000b). Other possible, alternative explanations for the observed microlensing event rate include lensing by a previously undetected thick disk component of the Milky way, self- lensing of the LMC, or an intervening dwarf galaxy or tidal tails. The different candidate populations can be broadly categorized into any lensing caused by a uniform foreground lensing population (screen-lensing ), and lensing for which the lensing population is spatially close to the source population (self-lensing). The goal of the SuperMacho project, a next generation microlensing survey towards the LMC, is to determine which or what mixture of these two categories causes the observed microlensing rates by utilizing their spatial differences in lensing rates. We introduce the difference image analysis pipeline which is essential to handle the enormous amount of data, and perform completeness tests by adding fake stars. (Abstract shortened by UMI.)

Rest, Armin

415

MIPSGAL II: Surveying the innermost part of the Galactic plane at 24 and 70 microns with MIPS  

NASA Astrophysics Data System (ADS)

We propose a 72 square degree survey of the innermost Galactic disk (|l| < 10, up to |b| < 3) at 24 and 70 microns with MIPS. These observations will connect the two fields observed by MIPSGAL and are complementary to the GLIMPSE II and proposed GLIMPSE 3D surveys. This data will finish the census of massive star formation inside the molecular ring, provide detailed information on the distribution and energetics of small dust grains toward the nucleus of our Galaxy, and identify all massive evolved stars in the surveyed portion of the Galactic bulge. The data will be processed with the MIPSGAL pipeline which significantly reduces artifacts caused by the bright backgrounds and sources in the Galactic plane. As a legacy program, we are waiving the proprietary rights to the data and plan to distribute enhanced data products such as image mosaics and source catalogs.

Carey, Sean; Noriega-Crespo, Alberto; Kraemer, Kathleen; Ingalls, Jim; Mizuno, Don; Price, Stephan; Padgett, Deborah; Marleau, Francine; Shenoy, Sachin; Kuchar, Thomas; Ali, Babar; Berriman, Bruce; Molinari, Sergio; Testi, Leonardo; Cutri, Roc; Indebetouw, Remy; Martin, Peter; Latter, Bill; Boulanger, Francois; Miville-Deschenes, Marc-Antoine; Rebull, Luisa; Paladini, Roberta; Shipman, Russ

2006-05-01

416

Saturn's largest ring.  

PubMed

Most planetary rings in the Solar System lie within a few radii of their host body, because at these distances gravitational accelerations inhibit satellite formation. The best known exceptions are Jupiter's gossamer rings and Saturn's E ring, broad sheets of dust that extend outward until they fade from view at five to ten planetary radii. Source satellites continuously supply the dust, which is subsequently lost in collisions or by radial transport. Here we report that Saturn has an enormous ring associated with its outer moon Phoebe, extending from at least 128R(S) to 207R(S) (Saturn's radius R(S) is 60,330 km). The ring's vertical thickness of 40R(S) matches the range of vertical motion of Phoebe along its orbit. Dynamical considerations argue that these ring particles span the Saturnian system from the main rings to the edges of interplanetary space. The ring's normal optical depth of approximately 2 x 10(-8) is comparable to that of Jupiter's faintest gossamer ring, although its particle number density is several hundred times smaller. Repeated impacts on Phoebe, from both interplanetary and circumplanetary particle populations, probably keep the ring populated with material. Ring particles smaller than centimetres in size slowly migrate inward and many of them ultimately strike the dark leading face of Iapetus. PMID:19812546

Verbiscer, Anne J; Skrutskie, Michael F; Hamilton, Douglas P

2009-10-07

417

COMPETITIVIDADE, ESPECIALIZAÇÃO E VANTAGEM COMPARATIVA DO ESTADO DE MATO GROSSO NO MERCADO INTERNACIONAL: UM ESTUDO DE INDICADORES DE COMÉRCIO EXTERIOR NO PERÍODO 1996- 2007  

Microsoft Academic Search

Este artigo identifica os grupos de produtos do estado de Mato Grosso que exibem vantagens competitivas no comércio exterior durante o período 1996-2007. Para tanto, com base em dados da Secretaria de Comércio Exterior do Ministério da Indústria e Comércio, estimam-se indicadores de Comércio Exterior, tais como VCR (Vantagens Comparativas Reveladas), ICSC (Índice de Contribuição ao Saldo da Balança Comercial)

Paula Luciana Silva; Benedito Dias Pereira; Alexandre Magno Faria; Gerson Rodrigues Silva; Arturo Zavala Zavala

2008-01-01

418

Noncommutative PRÜFER Rings  

NASA Astrophysics Data System (ADS)

The concept of a Prüfer ring is generalized to orders in simple Artinian rings so that the new concept gives a minimal class of rings closed under Morita equivalence, but in the commutative case does not extend the class of Prüfer domains.In §1 this problem is solved and some elementary properties of noncommutative Prüfer rings are given. In §2 theorems on the localization of a noncommutative Prüfer ring with respect to a prime ideal are proved, these being the basis of the theory. In §3 noncommutative Prüfer rings in a simple finite-dimensional algebra over a field are considered. The main problem, which is posed and partially solved here, involves the connection between a noncommutative Prüfer ring and its center.

Dubrovin, N. I.

1993-02-01

419

The Discovery and Modeling of O-Type-Like Collisional Ring Galaxies  

NASA Astrophysics Data System (ADS)

A new type of ring galaxies is discovered from the catalog of collisional ring galaxies in Madore et al. (2009). They are galaxies with axis-symmetric rings but originally classified as P-type collisional ring galaxies due to the existence of nearby companions. We call them O-Type-Like Collisional Ring Galaxies and model their formation through simulations of head-on galactic mergers. After head-on collisions by dwarf galaxies moving along the symmetric axis of disk galaxies, it was found that the simulations with smaller initial relative velocities between two galaxies, or the cases with heavier dwarf galaxies, could produce rings with higher density contrasts. There are more than one generation of rings in one collision and the lifetime of any generation of rings is about one dynamical time. We found that head-on penetrations could explain O-Type-Like Collisional Ring Galaxies well and the simulated rings resembling the observational images of rings are those at the early stage of one of the ring-generations.

Wu, Y.-T.; Jiang, I.-G.

2013-10-01

420

RING STAR FORMATION RATES IN BARRED AND NONBARRED GALAXIES  

SciTech Connect

Nonbarred ringed galaxies are relatively normal galaxies showing bright rings of star formation in spite of lacking a strong bar. This morphology is interesting because it is generally accepted that a typical galactic disk ring forms when material collects near a resonance, set up by the pattern speed of a bar or bar-like perturbation. Our goal in this paper is to examine whether the star formation properties of rings are related to the strength of a bar or, in the absence of a bar, to the non-axisymmetric gravity potential in general. For this purpose, we obtained H{alpha} emission line images and calculated the line fluxes and star formation rates (SFRs) for 16 nonbarred SA galaxies and four weakly barred SAB galaxies with rings. For comparison, we combine our new observations with a re-analysis of previously published data on five SA, seven SAB, and 15 SB galaxies with rings, three of which are duplicates from our sample. With these data, we examine what role a bar may play in the star formation process in rings. Compared to barred ringed galaxies, we find that the inner ring SFRs and H{alpha}+[N II] equivalent widths in nonbarred ringed galaxies show a similar range and trend with absolute blue magnitude, revised Hubble type, and other parameters. On the whole, the star formation properties of inner rings, excluding the distribution of H II regions, are independent of the ring shapes and the bar strength in our small samples. We confirm that the deprojected axis ratios of inner rings correlate with maximum relative gravitational force Q{sub g} ; however, if we consider all rings, a better correlation is found when a local bar forcing at the radius of the ring, Q{sub r} , is used. Individual cases are described and other correlations are discussed. By studying the physical properties of these galaxies, we hope to gain a better understanding of their placement in the scheme of the Hubble sequence and how they formed rings without the driving force of a bar.

Grouchy, R. D.; Buta, R. J. [Cerro-Tololo Inter-American Observatory, La Serena (Chile); Salo, H.; Laurikainen, E. [Department of Physical Sciences, Astronomy Division, University of Oulu, FI-90014 Oulu (Finland)

2010-06-15

421

Galactic searches for dark matter  

NASA Astrophysics Data System (ADS)

For nearly a century, more mass has been measured in galaxies than is contained in the luminous stars and gas. Through continual advances in observations and theory, it has become clear that the dark matter in galaxies is not comprised of known astronomical objects or baryonic matter, and that identification of it is certain to reveal a profound connection between astrophysics, cosmology, and fundamental physics. The best explanation for dark matter is that it is in the form of a yet undiscovered particle of nature, with experiments now gaining sensitivity to the most well-motivated particle dark matter candidates. In this article, I review measurements of dark matter in the Milky Way and its satellite galaxies and the status of Galactic searches for particle dark matter using a combination of terrestrial and space-based astroparticle detectors, and large scale astronomical surveys. I review the limits on the dark matter annihilation and scattering cross sections that can be extracted from both astroparticle experiments and astronomical observations, and explore the theoretical implications of these limits. I discuss methods to measure the properties of particle dark matter using future experiments, and conclude by highlighting the exciting potential for dark matter searches during the next decade, and beyond.

Strigari, Louis E.

2013-10-01

422

Galactic archaeology with DIVA data  

NASA Astrophysics Data System (ADS)

The present stellar population of the Galaxy is a fossil record of its formation and evolution. The spatial and kinematic distribution functions of stars in the local neigbourhood of the sun thus are far-reaching diagnostic tools for ``archaeological'' research into the history of a spiral galaxy. The planned astrometric and photometric satellite DIVA will measure the positions, proper motions and parallaxes of all stars down to 15th visual magnitude (about 35 million objects) and provide multi-channel intermediate-band photometry for all stars down to V <= 13.5 (about 10 million objects). This large amount of high-quality observational data will allow investigations of the local galactic structure with unprecedented statistical detail and spatial depth. Results will touch such diverse questions as e.g. possible triaxialities of the halo and bulge, the formation history of disk stars and open clusters, the dissolution of open clusters, the ``heating'' of the disk, the evolutionary significance of large local disk features like Gould's belt, and the search for kinematic halo substructures which might have been produced by past merger events. Going somewhat beyond the Galaxy, DIVA will determine the space velocity and internal kinematics of the Magellanic Clouds with high precision. The astrometric performance of DIVA significantly exceeds that of its predecessor HIPPARCOS in all important aspects. Perhaps even more importantly, the multi-channel photometry will physically characterize the vast number of stars that are observed.

Röser, S.; Bastian, U.; Wagner, S. J.

423

Measurement of the exterior convective film coefficient for windows in low-rise buildings  

SciTech Connect

The MoWiTT field facility is used to measure the convective film coefficient over the exterior surface of a window. The MoWiTT-measured data is compared to some commonly-used experimental and theoretical models. The comparison shows that the MoWiTT data disagrees with the previously used models such as the ASHRAE/DOE-2 model. The reasons for these disagreements are discussed. An experimental model, based on the MoWiTT data, is presented to correlate the film coefficient with the difference in temperatures of the exterior glass surface and the ambient, in the natural convection region, and with the site wind speed, in the forced convection region. The wind speed is considered both in windward and leeward hemispheres. The validity of the MoWiTT model for low-rise buildings is then discussed.

Yazdanian, M.; Klems, J.H. [Lawrence Berkeley Lab., CA (United States). Energy and Environmental Div.

1993-10-01

424

Energy input from the exterior cusp into the ionosphere: Correlated ground-based and satellite observations  

NASA Astrophysics Data System (ADS)

The energy transport from the exterior cusp into the ionosphere is investigated using coordinated ground-based (EISCAT and MIRACLE) and satellite (Cluster) observations. EISCAT and MIRACLE data are used to estimate the plasma heating in the F-region and the Joule heating in the E-region. Cluster measurements are used to derive the electromagnetic and particle energy fluxes at the high altitudes. These fluxes are then compared with the energy deposition into the ionospheric cusp during a 30 minutes long time interval in which Cluster and EISCAT are nearly conjugated. It is shown that the particles seen at about 9 R e in the exterior cusp carry an earthward energy flux that corresponds to the observed heating of the F-region. The estimated earthward Poynting flux is more than enough to account for the Joule heating in the E-region.

Yordanova, E.; Sundkvist, D.; Buchert, S. C.; André, M.; Ogawa, Y.; Morooka, M.; Margithu, O.; Amm, O.; Fazakerley, A. N.; Réme, H.

2007-02-01

425

DOUBLE-PEAKED NARROW-LINE ACTIVE GALACTIC NUCLEI. II. THE CASE OF EQUAL PEAKS  

SciTech Connect

Active galactic nuclei (AGNs) with double-peaked narrow lines (DPAGNs) may be caused by kiloparsec-scale binary AGNs, bipolar outflows, or rotating gaseous disks. We examine the class of DPAGNs in which the two narrow-line components have closely similar intensity as being especially likely to involve disks or jets. Two spectroscopic indicators support this likelihood. For DPAGNs from Smith et al., the 'equal-peaked' objects (EPAGNs) have [Ne V]/[O III]ratios lower than for a control sample of non-double-peaked AGNs. This is unexpected for a pair of normal AGNs in a galactic merger, but may be consistent with [O III] emission from a rotating ring with relatively little gas at small radii. Also, [O III]/H{beta} ratios of the redshifted and blueshifted systems in the EPAGN are more similar to each other than in a control sample, suggestive of a single ionizing source and inconsistent with the binary interpretation.

Smith, K. L.; Shields, G. A.; Salviander, S.; Stevens, A. C. [Department of Astronomy, University of Texas, Austin, TX 78712 (United States); Rosario, D. J., E-mail: klsmith@astro.umd.edu, E-mail: shields@astro.as.utexas.edu, E-mail: triples@astro.as.utexas.edu, E-mail: acs0196@mail.utexas.edu, E-mail: rosario@mpe.mpg.de [Max-Planck-Institute for Extraterrestrial Physics, D-85748 Garching (Germany)

2012-06-10

426

3. EXTERIOR/STREET LEVEL VIEW, LOOKING WEST ALONG FIRST AVENUE NORTH ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

3. EXTERIOR/STREET LEVEL VIEW, LOOKING WEST ALONG FIRST AVENUE NORTH WITH (LEFT TO RIGHT) CALDWELL-MILNER, MCADORY, JOHN HAND, WOODWARD BUILDINGS AND BROWN MARX BUILDING (RIGHT). ALSO PICTURED IS THE BANK FOR SAVINGS BUILDING (TOP RIGHT) AND THE RAILROAD RESERVATION (TOP LEFT TO RIGHT). VIEW TAKEN AS CITY THAWS FROM A MARCH BLIZZARD. - Heaviest Corner on Earth (Commercial), First Avenue, North & Twentieth (20th) Street, North, Birmingham, Jefferson County, AL

427

Postulational approach to schwarzschild’s exterior solution with application to a class of interior solutions  

Microsoft Academic Search

Summary  In order to clarify the physical ideas underlying Schwarzschild’s exterior solution, a postulational derivation is given that\\u000a does not make use of the field equations. Basically this amounts to replacing two field equations by two postulates, one of\\u000a which is a strong version of the principle of equivalence and the other, Newton’s inverse square law. These postulates are\\u000a more general

F. R. Tangherlini

1962-01-01

428

Natural Boundary Element Method for Stokes Problem of Exterior Circular Domain  

Microsoft Academic Search

As the basis of N-S equations of viscous incompressible fluid, Stokes problems[l] have been the research hotspot for years. However, there have been few exact analytical solutions for the Stokes flow so far. Yu[2] utilized natural boundary element method to calculate the Stokes problem of an exterior circular region, but the equations can but calculate the case that the velocity

W. H. Peng; Z. Z. Dong; G. H. Cao; H. M. Zhao

2009-01-01

429

PROCESS WATER BUILDING, TRA605. STRUCTURAL FOUNDATION PLAN. FOOTINGS FOR EXTERIOR ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

PROCESS WATER BUILDING, TRA-605. STRUCTURAL FOUNDATION PLAN. FOOTINGS FOR EXTERIOR AND INTERIOR WALLS. EQUIPMENT PADS. STRAINER PIT DETAILS. BEARING STRENGTH FOR EAST WALL TO SUPPORT FUTURE FLOOR AND ROOF LOADS. BLAW-KNOX 3150-805-1, 11/1950. INL INDEX NO. 531-0605-62-098-100657, REV. 4. - Idaho National Engineering Laboratory, Test Reactor Area, Materials & Engineering Test Reactors, Scoville, Butte County, ID

430

Acrylate grafted dehydrated castor oil alkyd—A binder for exterior paints  

Microsoft Academic Search

To meet the requirement of improved durability of alkyd resin for use in weatherwork paint for superstructure of ships, an\\u000a attempt has been made to chemically modify a castor oil alkyd by graft copolymerization with methyl methacrylate and butyl\\u000a methacrylate in view of their ability to provide polymers with good exterior durability. Characterization of the experimental\\u000a resins, in respect to

Subhasri Majumdar; Dhirendra Kumar; Y. P. S. Nirvan

1998-01-01

431

Flight test measurement of exterior turbulent boundary layer pressure fluctuations on Boeing model 737 airplane  

Microsoft Academic Search

The exterior pressure fluctuation measurements were carried out on Boeing model 737 airplane in two separate flight tests. A seven-microphone array was used at two different locations along the fuselage. The measurements were carried out for Mach numbers of 0.78, 0.6 and 0.45 for the forward location, and for Mach numbers of 0.78 and 0.45 for the aft location. The

W. V. Brat

1971-01-01

432

The evaluation of paint performance for exterior applications in Singapore's tropical environment  

Microsoft Academic Search

Two water-base paints, a regular non-algae and an algae resistant emulsion for decorative purposes, were exposed to artificial, i.e. accelerated, and natural weathering tests and the deterioration compared to that for similar paint applied to exterior walls on multi-unit buildings in Singapore. The artificial weathering test was found not to provide a good representation of actual performance since it only

Salil K. Roy; Lee Beng Thye; Derek O. Northwood

1996-01-01

433

Time-domain fields exterior to a two-dimensional FDTD space  

Microsoft Academic Search

A transformation algorithm for the near-zone and far-zone fields exterior to a two-dimensional (2-D) finite-difference time-domain (FDTD) field lattice has been developed entirely in the time domain. The fields are found from a surface integration of the convolution of the time derivative of equivalent currents and charges along a contour that encloses the scatterer or radiator of interest. The kernel

Mark Kragalott; Michael S. Kluskens; William P. Pala

1997-01-01

434

Thermal performance patterns on solid masonry exterior walls of historic buildings  

NASA Astrophysics Data System (ADS)

The Parliamentary Precinct in Ottawa, Canada is comprised of a number of historic buildings that include the House of Commons, the Senate Chamber, the Parliamentary Library, the Peace Tower, and other buildings that provide offices for parliamentarians and their staff. The majority of these buildings have exterior walls that are made of solid masonry with thicknesses ranging between 400 mm and 800 mm. In some cases, special wall areas are more than 1200 mm thick and are comprised of various types of masonry materials. With winter design temperatures of minus 25 degrees Celsius, more than 170 cm of snowfall, and numerous thaws during the five month heating season, the exterior environmental conditions acting on the exterior wall assemblies of these historic buildings are severe enough to cause masonry and mortar deterioration wherever moisture accumulates during winter months. Infrared thermographic inspections were carried out to locate and identify the casual mechanisms of moisture accumulation within masonry wall assemblies. This paper discusses the types of thermal patterns produced by various mechanisms of heat loss and identifies some of the typical areas where possible masonry deterioration occurs. Knowledge gained from these extensive investigations is used to develop a non destructive test methodology to locate areas of freeze thaw damage as part of a predictive and preventative maintenance program to reduce preservation costs of these historical structures.

Colantonio, Antonio

1997-04-01

435

Measurement of Exterior Foundation Insulation to Assess Durability in Energy-Saving Performance  

SciTech Connect

The foundation of a house is a sometimes ignored component of the building because of its low visibility. It is increasingly evident, however, that attention to good foundation design and construction significantly benefits the homeowner and the builder by mitigating future problems. Good foundation design and construction practice involves not only insulating to save energy but also providing effective structural design as well as moisture, termite, and radon control techniques as appropriate. Energy efficiency in housing is augmented by use of exterior slab and basement insulation, but high moisture content in the insulation material has led to concerns about its durability. The activity under this task was to extract six different exterior insulation systems that were characterized at installation and have been in the ground for 9 months to 15 years. R-value and moisture content were measured and inspections conducted for evidence of termite intrusion or deterioration. Based on the results, the durability of the various systems has been documented and assessments made of which systems appear to be best practice. Heat flux and temperature measurement data had been archived for some of the exterior insulation tests, thereby providing a unique opportunity to assess energy-saving performance and durability over the long term. The results show that the durability of foundation insulation systems depends on insulation type as well as on foundation type and local boundary conditions, the latter of which may have a marked influence on the durability of energy-saving performance.

Kehrer, Manfred [ORNL; Christian, Jeff [Oak Ridge National Laboratory (ORNL)

2012-04-01

436

Interior and exterior sound field control using general two-dimensional first-order sources.  

PubMed

Reproduction of a given sound field interior to a circular loudspeaker array without producing an undesirable exterior sound field is an unsolved problem over a broadband of frequencies. At low frequencies, by implementing the Kirchhoff-Helmholtz integral using a circular discrete array of line-source loudspeakers, a sound field can be recreated within the array and produce no exterior sound field, provided that the loudspeakers have azimuthal polar responses with variable first-order responses which are a combination of a two-dimensional (2D) monopole and a radially oriented 2D dipole. This paper examines the performance of circular discrete arrays of line-source loudspeakers which also include a tangential dipole, providing general variable-directivity responses in azimuth. It is shown that at low frequencies, the tangential dipoles are not required, but that near and above the Nyquist frequency, the tangential dipoles can both improve the interior accuracy and reduce the exterior sound field. The additional dipoles extend the useful range of the array by around an octave. PMID:21303006

Poletti, M A; Abhayapala, T D

2011-01-01

437

Clouds Dominate the Galactic Halo  

NASA Astrophysics Data System (ADS)

Using the exquisite sensitivity of the National Science Foundation's Robert C. Byrd Green Bank Telescope (GBT), astronomer Jay Lockman of the National Radio Astronomy Observatory (NRAO) in Green Bank, W. Va., has produced the best cross-section ever of the Milky Way Galaxy's diffuse halo of hydrogen gas. This image confirms the presence of discrete hydrogen clouds in the halo, and could help astronomers understand the origin and evolution of the rarefied atmosphere that surrounds our Galaxy. Lockman presented his findings at the American Astronomical Society meeting in Seattle, WA. Hydrogen Clouds Graphic Artist's Rendering of the Milky Way (background) with insert showing GBT image of cross-section of neutral atomic Hydrogen Credit: Kirk Woellert/National Science Foundation Patricia Smiley, NRAO. "The first observations with the Green Bank Telescope suggested that the hydrogen in the lower halo, the transition zone between the Milky Way and intergalactic space, is very clumpy," said Lockman. "The latest data confirm these results and show that instead of trailing away smoothly from the Galactic plane, a significant fraction of the hydrogen gas in the halo is concentrated in discrete clouds. There are even some filaments." Beyond the star-filled disk of the Milky Way, there exists an extensive yet diffuse halo of hydrogen gas. For years, astronomers have speculated about the origin and structure of this gas. "Even the existence of neutral hydrogen in the halo has been somewhat of a puzzle," Lockman remarked. "Unlike the Earth's atmosphere, which is hot enough to hold itself up against the force of gravity, the hydrogen in the halo is too cool to support itself against the gravitational pull of the Milky Way." Lockman points out that some additional factor has to be involved to get neutral hydrogen to such large distances from the Galactic plane. "This force could be cosmic rays, a supersonic wind, the blast waves from supernovae, or something we have not thought of yet," he said. Earlier this year, data taken with the newly commissioned GBT demonstrated that rather than a diffuse mist or other ill-defined feature - as many astronomers had speculated - the halo was in fact made up of well-defined clouds. "The discovery of these clouds, each containing 50-to-100 solar masses of hydrogen and averaging about 100 light-years in diameter, challenged many of the prevailing theories about the structure and dynamics of the halo," said Lockman. The clouds were discovered about 25,000 light-years from Earth toward the center of our Galaxy. The latest findings show the clouds extend at least 5,000 light-years above and below the Galactic plane. Though the initial studies by Lockman revealed the presence of these clouds, the data were insufficient to conclusively show that they were present throughout the entire halo. These latest results provide valuable evidence that the earlier results were truly representative of the entire halo. "The richness and variety of this phenomenon continues to astound me," remarked Lockman. Lockman's new studies also confirm that these clouds travel along with the rest of the Galaxy, rotating about its center. These studies clearly rule out the possibility that so-called "high-velocity clouds" were responsible for what was detected initially. High-velocity clouds are vagabond clumps of intergalactic gas, possibly left over from the formation of the Milky Way and other nearby galaxies. "One thing that is for certain is that these are not high-velocity clouds, this is an entirely separate phenomenon," said Lockman. According to the researcher, the ubiquitous nature and dynamics of these newly discovered clouds support the theory that they are condensing out of the hot gas that is lifted into the halo through supernova explosions. When a massive star dies, it produces a burst of cosmic rays and an enormous expanding bubble of gas at a temperature of several million degrees Celsius. Over time, this hot gas will rise in

2003-01-01

438

The Planetary Rings Node  

NSDL National Science Digital Library

The Planetary Rings Node of the Planetary Data System is devoted to archiving, cataloging and distributing scientific data sets relevant to planetary ring systems. In addition to data sets, this site offers on-line tools for planning, acquiring and interpreting ring observations and downloadable routines for calculations of orbital motion and time conversions. There are also images, animations and artwork of Jupiter, Saturn, Uranus, and Neptune.

439

Saturn's rings - an overview  

NASA Astrophysics Data System (ADS)

Saturn's rings embody in their diversity the entire spectrum of ring properties seen across the outer solar system, and remain unique in fundamental ways. The Voyager flybys revealed their complexity in 1980-1981, while groundbased and HST observations have provided important new insights since that time. Since July 2004, when it skimmed only tens of thousands of km over the unlit face of the rings - collecting unique remote and in-situ observations as it entered orbit - Cassini has been fulfilling the long-held dream of understanding Saturn's rings in depth. As of this meeting, if all continues as planned, seven orbits designed specifically with ring observations in mind will have been completed - each providing even better geometric opportunities than an entire Voyager flyby (to a spacecraft with far more powerful instruments than Voyager). Even these represent only a fraction of what the complete mission will tell us about the rings. This talk will review the key properties of the rings, highlight the themes and new insights emerging from recent studies, and serve as a context for new results presented at the meeting. The key properties include the relationship of the rings to their close-in and embedded moons; the composition of the rings and its spatial variation; and the complex radial and vertical structure of the rings, as related to local particle sizes and mass density. The main themes are that several evolutionary processes cause all these to vary - we think substantially - with time, and that the rings may be much younger than Saturn. To achieve our goal of understanding the origin of the rings, we must start from an in-depth characterization of their current state, and peer back through their extensive evolution. Cassini observations, and their theoretical analysis, will ultimately make this possible.

Cuzzi, J. N.

2005-08-01

440

Inner polar rings and disks: Observed properties  

NASA Astrophysics Data System (ADS)

A list of galaxies with inner regions revealing polar (or strongly inclined to the main galactic plane) disks and rings is compiled from the literature data. The list contains 47 galaxies of all morphological types, from E to Irr. We consider the statistics of the parameters of polar structures known from observations. The radii of the majority of them do not exceed 1.5 kpc. The polar structures are equally common in barred and unbarred galaxies. At the same time, if a galaxy has a bar (or a triaxial bulge), this leads to the polar disk stabilization, so that its axis of rotation usually coincideswith the major axis of the bar. More than two thirds of all considered galaxies reveal one or another sign of recent interaction or merging. This fact indicates a direct relation between the external environment and the presence of an inner polar structure.

Moiseev, A. V.

2012-04-01

441

Galactic Habitable Zone and Astrobiological Complexity  

NASA Astrophysics Data System (ADS)

This is a short thesis description and for the sake of brevity most things are left out. For more details, those interested are further directed to the thesis related papers in this article reference list. Thesis itself is available at the University of Belgrade library "Svetozar Markovic" (Serbian version only). In this thesis we study the astrobiological history of the Galactic habitable zone through the means of numerical modeling. First group of simulations are unidimensional (time-axis) toy models examine the influence of global regulation mechanisms (gamma-ray bursts and supernovae) on temporal evolution of Galactic astrobiological complexity. It is shown that under the assumption of global regulation classical anti SETI arguments can be undermined. Second group of simulations are more complex bidimensional probabilistic cellular automata models of the Galactic thin disk. They confirm the findings of the toy models and give some insights into the spatial clustering of astrobiological complexity. As a new emerging multidisciplinary science the basic concepts of astrobiology are poorly understood and although all the simulations present here do not include some basic physics (such as Galactic kinematics and dynamics), the input parameters are somewhat arbitrary and could use a future refinement (such as the boundaries of the Galactic habitable zone). This is the cause for low weight and high uncertainty in the output results of the simulations. However, the probabilistic cellular automata has shown as a highly adaptable modeling platform that can simulate various class of astrobiological models with great ease.

Vukotic, B.

2012-12-01

442

How Many Galactic Variables will LSST Detect?  

NASA Astrophysics Data System (ADS)

The Large Synoptic Survey Telescope operational plan includes release of alerts, within 60 seconds, for all sources that are found to have varied from template images. The number of these alerts has been variously estimated at 105 to 106 per night. Many of these alerts will be for galactic variable stars. The number of galactic variables detected can be estimated from the bottom up, with known statistics for each variable type. Here we take a top-down approach. A galactic synthesis model (Robin et al, 2003) is used to generate a fictitious but statistically valid star list for a given pointing. Analysis of the first 3 months of the Kepler survey (Ciardi et al, 2011) is used to characterize the probability of stellar variability by spectral type, as a function of variability amplitude. With this model and the LSST survey parameters, it is possible to predict that LSST will alert on 105 galactic variable stars each night at intermediate galactic latitude. Most of these sources will be known variables after a few months of operation.

Ridgway, Stephen T.

2012-01-01

443

ARGOS - II. The Galactic bulge survey  

NASA Astrophysics Data System (ADS)

We describe the motivation, field locations and stellar selection for the Abundances and Radial velocity Galactic Origins Survey (ARGOS) spectroscopic survey of 28 000 stars in the bulge and inner disc of the Milky Way galaxy across latitudes of b = -5° to -10°. The primary goal of this survey is to constrain the formation processes of the bulge and establish whether it is predominantly a merger or instability remnant. From the spectra (R = 11 000), we have measured radial velocities and determined stellar parameters, including metallicities and [?/Fe] ratios. Distances were estimated from the derived stellar parameters and about 14 000 stars are red giants within 3.5 kpc of the Galactic Centre. In this paper, we present the observations and analysis methods. Subsequent papers (III and IV) will discuss the stellar metallicity distribution and kinematics of the Galactic bulge and inner disc, and the implications for the formation of the bulge.

Freeman, K.; Ness, M.; Wylie-de-Boer, E.; Athanassoula, E.; Bland-Hawthorn, J.; Asplund, M.; Lewis, G.; Yong, D.; Lane, R.; Kiss, L.; Ibata, R.

2013-02-01

444

Fast galactic dynamos and interstellar magnetic bubbles  

NASA Astrophysics Data System (ADS)

Large (greater than 100 pc) interstellar magnetic bubbles are necessary in the cosmic-ray-driven fast galactic dynamo, as pioneered by Parker in 1992. In a first part, a look is made at the available data on nearby (less than 1000 pc) large interstellar magnetic bubbles. Here the magnetic field strength B in a large shell of density n around an OB association is found to be a few times greater than that outside in the general interstellar medium, varying typically like B approximately n, as expected for a shocked medium. In a second part, some tests are made of the predictions about interstellar magnetic bubbles made by the theory of a cosmic-ray driven fast galactic dynamo. The bubble tests generally support the idea of a cosmic-ray-driven fast galactic dynamo for the Milky Way.

Vallee, J. P.

1993-09-01

445

The Galactic Bulge Survey: Status and Results  

NASA Astrophysics Data System (ADS)

We have initiated a survey that will image in X-rays, using the Chandra X-ray observatory, a substantial fraction of the Galactic Bulge by covering a pair of 6 x 1 square degrees centered at 1.5 degrees above and below the Galactic Center. We call this project the Galactic Bulge Survey (GBS). Thanks to a careful design, this survey optimizes the ability to characterize X-ray sources using optical follow-up. The GBS will provide the first homogeneous sample of bulge sources accessible for study at optical bands and it has the full potential of discovering hundreds of quiescent low-mass X-ray binaries. In this poster we present the current status and first resuts of the GBS.

Torres, Manuel; Jonker, P. G.; Bassa, C.; Hynes, R. I.; Nelemans, G.; Steeghs, D.

2010-02-01

446

Polarimetry of Galactic Discs: A Brief Review  

NASA Astrophysics Data System (ADS)

This paper reviews galactic discs observed in polarimetry at optical to mid-IR (MIR) wavelengths. Polarization maps of galaxies can be used as probes of galactic dust chemistry, dust distribution, and of the large-scale magnetic fields that thread through galaxies. Whilst polarimeters have been available to galaxy researchers for numerous years, it became clear during the literature survey for this review that there has been relatively little research performed in this field, either observationally or theoretically. This paper therefore concentrates on a limited number of papers in greater detail, and discusses the closely related field of activity in galactic nuclei (AGN). After providing this disclaimer, we apologize to those authors whose work is not included in this review.

Packham, C.; Young, S.; Axon, D. J.

2011-11-01

447

VARIABLE RADIO SOURCES IN THE GALACTIC PLANE  

SciTech Connect

Using three epochs of Very Large Array observations of the Galactic plane in the first quadrant taken {approx}15 years apart, we have conducted a search for a population of variable Galactic radio emitters in the flux density range 1-100 mJy at 6 cm. We find 39 variable sources in a total survey area of 23.2 deg{sup 2}. Correcting for various selection effects and for the extragalactic variable population of active galactic nuclei, we conclude there are {approx}1.6 deg{sup -2} Galactic sources which vary by more than 50% on a time scale of years (or shorter). We show that these sources are much more highly variable than extragalactic objects; more than 50% show variability by a factor >2 compared to <10% for extragalactic objects in the same flux density range. We also show that the fraction of variable sources increases toward the Galactic center (another indication that this is a Galactic population), and that the spectral indices of many of these sources are flat or inverted. A small number of the variables are coincident with mid-IR sources and two are coincident with X-ray emitters, but most have no known counterparts at other wavelengths. Intriguingly, one lies at the center of a supernova remnant, while another appears to be a very compact planetary nebula; several are likely to represent activity associated with star formation regions. We discuss the possible source classes which could contribute to the variable cohort and follow-up observations which could clarify the nature of these sources.

Becker, Robert H. [Physics Department, University of California, Davis, CA 95616 (United States); Helfand, David J. [Department of Astronomy, Columbia University, New York, NY 10027 (United States); White, Richard L. [Space Telescope Science Institute, Baltimore, MD 21218 (United States); Proctor, Deanne D., E-mail: bob@igpp.ucllnl.or [IGPP/Lawrence Livermore National Laboratory, Livermore, CA (United States)

2010-07-15

448

Galactic spiral patterns and dynamo action  

NASA Astrophysics Data System (ADS)

The theory of mean-field galactic dynamos is generalized by allowing for a finite response time of the mean electromotive force (emf) to variations in the mean magnetic field and small-scale turbulence. A non-axisymmetric forcing of the dynamo by a spiral pattern (either stationary or transient) is invoked. The resulting magnetic spiral arms are phase-shifted from the spiral arms of the pattern by an angle 15°-40°, opposite to the sense of galactic rotation. Our findings may help to explain the phase shift between material and magnetic arms observed in NGC 6946 and other galaxies.

Chamandy, Luke; Subramanian, Kandaswamy; Shukurov, Anvar

2013-07-01

449

The Black Hole in the Galactic Center  

NASA Astrophysics Data System (ADS)

The Galactic Center harbors the closest MBH and enables therefore unique observations of a resolved stellar system around a MBH. In two ways, the Galactic Center is directly tied to gravitational wave observatories: (i) For extreme mass ratio inspirals, the GC system serves as a template. While it is very unikely that one will witness such an inspiral from our own Milky Way center, the detailed views of the stellar system are an anchor for the overall event rate estimates. (ii) Future infrared and submm observations will allow testing general relativity at Sgr A* — in a regime of field curvature in which also a future space-based gravitational wave observatory will measure.

Gillessen, S.

2013-01-01

450

A New Einstein Ring  

NASA Astrophysics Data System (ADS)

Using the VLT, Rémi Cabanac and colleagues1 have discovered a new and very impressive Einstein ring. This cosmic mirage, dubbed FOR J0332-3557, is seen towards the southern constellation Fornax (the Furnace), and is remarkable on at least two counts. First, it is a bright, almost complete Einstein ring. Second, it is the farthest of its type ever found.

2005-09-01

451

Hot piston ring tests  

Microsoft Academic Search

As part of the DOE\\/NASA Automotive Stirling Engine Project, tests were made at NASA Lewis Research Center to determine whether appendix gap losses could be reduced and Stirling engine performance increased by installing an additional piston ring near the top of each piston dome. An MTI-designed upgraded Mod I Automotive Stirling Engine was used. Unlike the conventional rings at the

David J. Allen; William A. Tomazic

1987-01-01

452

EBT ring physics  

SciTech Connect

This workshop attempted to evaluate the status of the current experimental and theoretical understanding of hot electron ring properties. The dominant physical processes that influence ring formation, scaling, and their optimal behavior are also studied. Separate abstracts were prepared for each of the 27 included papers. (MOW)

Uckan, N.A. (ed.)

1980-04-01

453

Low emittance damping rings  

SciTech Connect

The effects of synchrotron radiation and intrabeam scattering on the equilibrium emittance of electron storage rings are reviewed. Intrabeam scattering is shown to be important for damping rings with the invariant emittance needed for a linear collider operating in the quantum beamstrahlung regime.

Siemann, R.H.

1987-05-05

454

Ring Bar Grizzly.  

National Technical Information Service (NTIS)

The patent application relates to a ring bar grizzly used as a materials handling device to enable the jam-free transfer of loose rocks or other materials at the discharge end of a generally horizontal conveyor. Normally, this ring bar grizzly is used in ...

A. T. Fisk

1980-01-01

455

Exploring Polygon Rings.  

ERIC Educational Resources Information Center

Some topics in mathematics are unique because they can be explored by learners from the early grades through the advanced grades. An example of such a topic is polygon rings. Presents activities on polygon rings that integrate problem solving, reasoning, and communication. (Author/ASK)

Smith, Lyle R.

1999-01-01

456

Esophageal Rings and Webs  

MedlinePLUS

... determine if you have a ring or a web, your doctor may order one of these tests: Barium swallow test. This allows the radiologist to ... contribute to the development of esophageal rings and webs, your doctor probably will order a blood test for iron levels and, if you are deficient, ...

457

Nuclear Star-forming Ring of the Milky Way: Simulations  

NASA Astrophysics Data System (ADS)

We present hydrodynamic simulations of gas clouds in the central kpc region of the Milky Way that is modeled with a three-dimensional bar potential. Our simulations consider realistic gas cooling and heating, star formation, and supernova feedback. A ring of dense gas clouds forms as a result of X 1-X 2 orbit transfer, and our potential model results in a ring radius of ~200 pc, which coincides with the extraordinary reservoir of dense molecular clouds in the inner bulge, the Central Molecular Zone (CMZ). The gas clouds accumulated in the CMZ can reach high enough densities to form stars, and with an appropriate choice of simulation parameters, we successfully reproduce the observed gas mass and the star formation rate (SFR) in the CMZ, ~2 × 107 M sun and ~0.1 M sun yr-1. Star formation in our simulations takes place mostly in the outermost X 2 orbits, and the SFR per unit surface area outside the CMZ is much lower. These facts suggest that the inner Galactic bulge may harbor a mild version of the nuclear star-forming rings seen in some external disk galaxies. Furthermore, from the relatively small size of the Milky Way's nuclear bulge, which is thought to be a result of sustained star formation in the CMZ, we infer that the Galactic inner bulge probably had a shallower density profile or stronger bar elongation in the past.

Kim, Sungsoo S.; Saitoh, Takayuki R.; Jeon, Myoungwon; Figer, Donald F.; Merritt, David; Wada, Keiichi

2011-07-01

458

Hot piston ring tests  

SciTech Connect

As part of the DOE/NASA Automotive Stirling Engine Project, tests were made at NASA Lewis Research Center to determine whether appendix gap losses could be reduced and Stirling engine performance increased by installing an additional piston ring near the top of each piston dome. An MTI-designed upgraded Mod I Automotive Stirling Engine was used for these tests. Unlike the conventional rings at the bottom of the piston, these rings operated in a high temperature environment (700/sup 0/C). Because of this, we called them ''hot-rings.'' It was necessary that they be made of a high temperature alloy (Stellite 6B) and that a high temperature solid lubricant coating (NASA Lewis-developed PS-200) be applied to the cylinder walls. Engine tests were run at 5, 10, and 15 MPa operating pressure over a range of operating speeds. Tests were run both with the hot-rings in place and without them to pro-side a baseline for comparison. Although budget and schedule restrictions severely limited the testing, the minimum data to assess the potential of both the hot-rings and high temperature low friction coating was obtained. Results indicated a slight increase in power and efficiency with the hot-rings over the baseline configuration. This increase was over and above the friction loss introduced by the hot-rings. Seal leakage measurements showed a significant reduction in leakage with the hot-rings in place. In addition, cylinder wall temperature measurements indicated less cylinder heating in the appendix gap area - between the lower piston rings and the hot-ring. Approximately 22.4 hours of ring-on-coating operation were recorded. After the initial break-in period, wear on both the rings and the coating was low. The PS-200 coating seems to offer significant potential for long-term operation at high temperatures. Both the hot-ring and the PS-200 low friction coating show promise and should be pursued further.

Allen, D.J.; Tomazic, W.A.

1987-01-01

459

Dynamics of Dusty Rings  

NASA Astrophysics Data System (ADS)

The ring systems surrounding Jupiter, Saturn, Uranus and Neptune all contain components composed primarily of particles less than 100 microns across. These "dusty" ring features provide natural laboratories for investigating the dynamics of small particles in various environments. This talk will describe the results of recent examinations of dusty ring systems, focusing in particular on data from the highly productive Cassini Mission to Saturn. This mission has revealed many of the diverse processes that generate, transport and destroy small particles in various environments. Individual dust particle have relatively short lifetimes in planetary rings, as small grains can be destroyed by processes like sputtering on time scales less than 1000 years. Thus the visible dust in planetary rings must be continuously re-supplied by larger source bodies. The density and spatial distribution of dusty material can therefore constrain the sources and sinks of small particles in different environments. The small size of the particles in these dusty rings also makes them particularly sensitive to non-gravitational forces. Indeed, several structures in Saturn's dusty rings exhibit periodicities that appear to be tied to asymmetries in Saturn's rotating magnetosphere, while other dusty rings show patterns in their brightness or radial structure that can be attributed to solar radiation pressure. These structures and patterns can therefore clarify how electromagnetic and radiation forces influence the spatial distribution of dusty material in various contexts. Finally, in some of the denser dusty rings (like Saturn's F ring) there is evidence for the agglomeration of dust particles. This information should aid in efforts to understand the production, growth, transport and destruction of grains in other astrophysical systems.

Hedman, Matthew M.

2012-05-01

460

STEEL TRUSS TENSION RING SUPPORTING DOME ROOF. TENSION RING COVERED ...  

Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

STEEL TRUSS TENSION RING SUPPORTING DOME ROOF. TENSION RING COVERED BY ARCHITECTURAL FINISH. TENSION RING ROLLER SUPPORT AT COLUMN OBSCURED BY COLUMN COVERINGS. - Houston Astrodome, 8400 Kirby Drive, Houston, Harris County, TX

461

THE GALACTIC CENTER WEATHER FORECAST  

SciTech Connect

In accretion-based models for Sgr A*, the X-ray, infrared, and millimeter emission arise in a hot, geometrically thick accretion flow close to the black hole. The spectrum and size of the source depend on the black hole mass accretion rate M-dot . Since Gillessen et al. have recently discovered a cloud moving toward Sgr A* that will arrive in summer 2013, M-dot may increase from its present value M-dot{sub 0}. We therefore reconsider the 'best-bet' accretion model of Moscibrodzka et al., which is based on a general relativistic MHD flow model and fully relativistic radiative transfer, for a range of M-dot . We find that for modest increases in M-dot the characteristic ring of emission due to the photon orbit becomes brighter, more extended, and easier to detect by the planned Event Horizon Telescope submillimeter Very Long Baseline Interferometry experiment. If M-dot {approx}>8 M-dot{sub 0}, this 'silhouette' of the black hole will be hidden beneath the synchrotron photosphere at 230 GHz, and for M-dot {approx}>16 M-dot{sub 0} the silhouette is hidden at 345 GHz. We also find that for M-dot > 2 M-dot{sub 0} the near-horizon accretion flow becomes a persistent X-ray and mid-infrared source, and in the near-infrared Sgr A* will acquire a persistent component that is brighter than currently observed flares.

Moscibrodzka, M. [Department of Physics and Astronomy, University of Nevada, 4505 South Maryland Parkway, Las Vegas, NV 89154 (United States); Shiokawa, H.; Gammie, C. F. [Astronomy Department, University of Illinois, 1002 West Green Street, Urbana, IL 61801 (United States); Dolence, J. C., E-mail: monikam@physics.unlv.edu [Department of Astrophysical Sciences, Princeton University, Peyton Hall, 4 Ivy Lane, Princeton, NJ 08544 (United States)

2012-06-10

462

Solving the three-body Coulomb breakup problem using exterior complex scaling  

SciTech Connect

Electron-impact ionization of the hydrogen atom is the prototypical three-body Coulomb breakup problem in quantum mechanics. The combination of subtle correlation effects and the difficult boundary conditions required to describe two electrons in the continuum have made this one of the outstanding challenges of atomic physics. A complete solution of this problem in the form of a ''reduction to computation'' of all aspects of the physics is given by the application of exterior complex scaling, a modern variant of the mathematical tool of analytic continuation of the electronic coordinates into the complex plane that was used historically to establish the formal analytic properties of the scattering matrix. This review first discusses the essential difficulties of the three-body Coulomb breakup problem in quantum mechanics. It then describes the formal basis of exterior complex scaling of electronic coordinates as well as the details of its numerical implementation using a variety of methods including finite difference, finite elements, discrete variable representations, and B-splines. Given these numerical implementations of exterior complex scaling, the scattering wave function can be generated with arbitrary accuracy on any finite volume in the space of electronic coordinates, but there remains the fundamental problem of extracting the breakup amplitudes from it. Methods are described for evaluating these amplitudes. The question of the volume-dependent overall phase that appears in the formal theory of ionization is resolved. A summary is presented of accurate results that have been obtained for the case of electron-impact ionization of hydrogen as well as a discussion of applications to the double photoionization of helium.

McCurdy, C.W.; Baertschy, M.; Rescigno, T.N.

2004-05-17

463

The ring between ring fingers (RBR) protein family  

Microsoft Academic Search

Summary  Proteins of the ring between ring fingers (RBR)-domain family are characterized by three groups of specifically clustered\\u000a (typically eight) cysteine and histidine residues. Whereas the amino-terminal ring domain (N-RING) binds two zinc ions and\\u000a folds into a classical cross-brace ring finger, the carboxy-terminal ring domain (C-RING) involves only one zinc ion. The\\u000a three-dimensional structure of the central ring domain, the

Birgit Eisenhaber; Nina Chumak; Frank Eisenhaber; Marie-Theres Hauser

2007-01-01

464

Energy decay for the linear and semilinear wave equations in exterior domains with some localized dissipations  

Microsoft Academic Search

.   We derive the total energy decay and boundedness for the solutions to the initial boundary value problem for the wave equation in an exterior domain :\\u000a \\u000a \\u000a \\u000a \\u000a \\u000a \\u000a \\u000a \\u000a \\u000a with , where and a(x) is a nonnegative function which is positive near some part of the boundary and near infinity. We apply these estimates to prove the global existence of decaying solutions

Mitsuhiro Nakao

2001-01-01

465

Quantum Mechanics in the Exterior Region of a Schwarzschild Black Hole  

NASA Astrophysics Data System (ADS)

In this project we prove that the exterior region of a Schwarzschild Black-hole can be taken as space-time. For the case of Klein-Gordon field in the background of the Schwarzschild gravitational field we prove the existence of a self-adjoint hamiltonian operator. The problem reduces to a one-dimensional potential problem. We apply the WKB approximation to this problem. A comparison with the classical case is established. We find that in the quantum mechanical case reflection is present. We also show that probability is conserved.

Caroprese, Blas

1988-12-01

466

Infinite-range exterior complex scaling as a perfect absorber in time-dependent problems  

SciTech Connect

We introduce infinite range exterior complex scaling (irECS) which provides for complete absorption of outgoing flux in numerical solutions of the time-dependent Schroedinger equation with strong infrared fields. This is demonstrated by computing high harmonic spectra and wave-function overlaps with the exact solution for a one-dimensional model system and by three-dimensional calculations for the H atom and an Ne atom model. We lay out the key ingredients for correct implementation and identify criteria for efficient discretization.

Scrinzi, Armin [Ludwig Maximilians University, Theresienstrasse 37, D-80333 Munich (Germany) and Wolfgang Pauli Institute, A-1090 Vienna (Austria)

2010-05-15

467

High-level prokaryotic expression of envelope exterior of membrane protein of porcine epidemic diarrhea virus  

Microsoft Academic Search

The truncated fragment M? gene, encoding the exterior of the viral envelope protein of PEDV, was subcloned into prokaryotic expression vector pGEX-6p-1. The recombinant plasmid pGEX-6p-M? was constructed and transformed into E. coli BL21(DE3)pLysS for expression. SDS-PAGE analysis showed recombinant truncated M? protein was highly expressed by pGEX-6p-M? and the product fusion protein GST-M? reached 45% in the total bacteria

Gao Shenyang; Zha Enhui; Li Baoxian; Qiao Xinyuan; Tang Lijie; Ge Junwei; Li Yijing

2007-01-01

468

Hot piston ring tests  

NASA Astrophysics Data System (ADS)

As part of the DOE/NASA Automotive Stirling Engine Project, tests were made at NASA Lewis Research Center to determine whether appendix gap losses could be reduced and Stirling engine performance increased by installing an additional piston ring near the top of each piston dome. An MTI-designed upgraded Mod I Automotive Stirling Engine was used. Unlike the conventional rings at the bottom of the piston, these hot rings operated in a high temperature environment (700 C). They were made of a high temperature alloy (Stellite 6B) and a high temperature solid lubricant coating (NASA Lewis-developed PS-200) was applied to the cylinder walls. Engine tests were run at 5, 10, and 15 MPa operating pressure over a range of operating speeds. Tests were run both with hot rings and without to provide a baseline for comparison. Minimum data to assess the potential of both the hot rings and high temperature low friction coating was obtained. Results indicated a slight increase in power and efficiency, an increase over and above the friction loss introduced by the hot rings. Seal leakage measurements showed a significant reduction. Wear on both rings and coating was low.

Allen, David J.; Tomazic, William A.

1987-12-01

469

Physical processes in active galactic nuclei  

Microsoft Academic Search

Active galactic nuclei (AGNs) emit continuum radiation evenly spread over up to ten decades in frequency from the radio into the gamma-ray range. Plausible emission mechanisms and their characteristics are reviewed. In the deep potential wells around black holes the mean energy per proton can reach 100 MeV. Part or all of this energy may be channeled to all electrons

Roland Svensson

1986-01-01

470

Einstein Observations of Galactic supernova remnants  

SciTech Connect

This paper summarizes the observations of Galactic supernova remnants with the imaging detectors of the Einstein Observatory. X-ray surface brightness contours of 47 remnants are shown together with gray-scale pictures. Count rates for these remnants have been derived and are listed for the HRI, IPC, and MPC detectors. 118 refs.

Seward, F.D. (Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (USA))

1990-08-01

471

Astrophysical parameters of Galactic open clusters  

Microsoft Academic Search

We present a catalogue of astrophysical data for 520 Galactic open clusters. These are the clusters for which at least three most probable members (18 on average) could be identified in the ASCC-2.5, a catalogue of stars based on the Tycho-2 observations from the Hipparcos mission. We applied homogeneous methods and algorithms to determine angular sizes of cluster cores and

N. V. Kharchenko; A. E. Piskunov; S. Röser; E. Schilbach; R.-D. Scholz

2005-01-01

472

THE EDGE OF THE YOUNG GALACTIC DISK  

SciTech Connect

In this work, we report and discuss the detection of two distant diffuse stellar groups in the third Galactic quadrant. They are composed of young stars, with spectral types ranging from late O to late B, and lie at galactocentric distances between 15 and 20 kpc. These groups are located in the area of two cataloged open clusters (VdB-Hagen 04 and Ruprecht 30), projected toward the Vela-Puppis constellations, and within the core of the Canis Major overdensity. Their reddening and distances have been estimated by analyzing their color-color and color-magnitude diagrams, derived from deep UBV photometry. The existence of young star aggregates at such extreme distances from the Galactic center challenges the commonly accepted scenario in which the Galactic disk has a sharp cutoff at about 14 kpc from the Galactic center and indicates that it extends to much greater distances (as also supported by the recent detection of CO molecular complexes well beyond this distance). While the groups we find in the area of Ruprecht 30 are compatible with the Orion and Norma-Cygnus spiral arms, respectively, the distant group we identify in the region of VdB-Hagen 04 lies in the external regions of the Norma-Cygnus arm, at a galactocentric distance ({approx}20 kpc) where no young stars have been detected so far in the optical.

Carraro, Giovanni [ESO, Alonso de Cordova 3107, 19100 Santiago de Chile (Chile); Vazquez, Ruben A. [Facultad de Ciencias Astronomicas y Geofisicas (UNLP), Instituto de Astrofisica de La Plata (CONICET, UNLP), Paseo del Bosque s/n, La Plata (Argentina); Costa, Edgardo [Departamento de AstronomIa, Universidad de Chile, Casilla 36-D, Santiago (Chile); Perren, Gabriel [Instituto de Fisica de Rosario, IFIR (CONICET-UNR), Parque Urquiza, 2000 Rosario (Argentina); Moitinho, Andre [SIM/IDL, Faculdade de Ciencias da Universidade de Lisboa, Ed. C8, Campo Grande, 1749-016 Lisboa (Portugal)

2010-08-01

473

Gravitational microlensing by the galactic halo  

Microsoft Academic Search

A simple model of microlensing by massive objects that might be present in the halo of the Galaxy is presented. It is shown that in any nearby galaxy one star out of a million is strongly microlensed by a 'dark' object located in the Galactic halo, if the halo is made up of objects more massive than about 10 to

B. Paczynski

1986-01-01

474

Galactic tide and orbital evolution of comets  

Microsoft Academic Search

Equation of motion for a comet in the Oort cloud is numerically solved. Orbital evolution of the comet under the action of the gravity of the Sun and the Galaxy is presented for various initial conditions. Oscillations of the Sun with respect to the galactic equatorial plane are taken into account. Real values of physical quantities concerning the gravitational action

L. Komar; J. Klacka; P. Pastor

2009-01-01

475

Lightcurve Parameters of Northern Galactic Cepheids  

NASA Astrophysics Data System (ADS)

The BVRI light-curve parameters of 112 galactic Cepheids are determined by Fourier analysis using over 4,000 differential photoelectric observations. This catalog (see Abstr. 38.122.013) is similar to Schaltenbrand and Tammann's except that it is based on a homogeneous data set and the Fourier coefficients are given.

Moffett, T. J.; Barnes, T. G., III

1985-06-01

476

The Heliosphere and the Galactic Environment  

NASA Video Gallery

The boundaries surrounding our heliosphere can change both due to changes in our galactic environment and through changes in the solar wind emitted by the Sun. We see here an animation of the boundaries surrounding our solar system falling in and then expanding. These changes in our heliosphere must have happened in the past and will likely occur in the future.

Holly Zell

2010-09-28

477

Neutrino Flux Predictions for Known Galactic Microquasars  

Microsoft Academic Search

It has been proposed recently that Galactic microquasars may be prodigious emitters of TeV neutrinos that can be detected by upcoming km2 neutrino telescopes. In this paper we consider a sample of identified microquasars and microquasar candidates for which available data enable rough determination of the jet parameters. By employing the parameters inferred from radio observations of various jet ejection

C. Distefano; D. Guetta; E. Waxman; A. Levinson

2002-01-01

478

Some aspects of galactic cosmic ray acceleration  

NASA Astrophysics Data System (ADS)

I give a synopsis of two aspects of the Galactic Cosmic Ray (GCR) acceleration problem: the importance of the medium energy gamma-ray window, and several specific astrophysical sources which merit further investigation. NOTE: figures may be found in the on-line version only: atro-ph/0309758.

Butt, Yousaf Mahmood

2005-01-01

479

Galactic cosmic radiation model and its applications  

Microsoft Academic Search

A model for the differential energy spectra of galactic cosmic radiation as a function of solar activity is described. It is based on the standard diffusion-convection theory of solar modulation. Estimates of the modulation potential based on fitting this theory to observed spectral measurements from 1954 to 1989 are correlated to the Climax neutron counting rates and to the sunspot

G. D Badhwar; P. M O'Neill

1996-01-01

480

The origin of galactic magnetic fields  

Microsoft Academic Search

There are two suggested origins for the observed galactic magnetic fields: the primordial origin and the dynamo origin. In this paper the dynamo origin is discussed and criticized. It is pointed out that if the interstellar medium, in which the dynamo operates, is infinitely conducting, the dynamo will not behave properly but will amplify the chaotic part of the magnetic

R. M. Kulsrud

1990-01-01

481

Modified Gravity Spins up Galactic Halos  

NASA Astrophysics Data System (ADS)

We investigate the effect of modified gravity on the specific angular momentum of galactic halos by analyzing the halo catalogs at z = 0 from high-resolution N-body simulations for a f(R) gravity model that meets the solar-system constraint. It is shown that the galactic halos in the f(R) gravity model tend to acquire significantly higher specific angular momentum than those in the standard ?CDM model. The largest difference in the specific angular momentum distribution between these two models occurs for the case of isolated galactic halos with mass less than 1011 h -1 M ?, which are likely least shielded by the chameleon screening mechanism. As the specific angular momentum of galactic halos is rather insensitive to other cosmological parameters, it can in principle be an independent discriminator of modified gravity. We speculate a possibility of using the relative abundance of low surface brightness galaxies (LSBGs) as a test of general relativity given that the formation of the LSBGs occurs in fast spinning dark halos.

Lee, Jounghun; Zhao, Gong-Bo; Li, Baojiu; Koyama, Kazuya

2013-01-01

482

Satellite Anomalies from Galactic Cosmic Rays  

Microsoft Academic Search

Anomalies in communication satellite operation have been caused by the unexpected triggering of digital circuits. Interactions with galactic cosmic rays were investigated as a mechanism for a number of these events. The mechanism assumed was the charging of the base-emitter capacitance of sensitive transistors to the turn-on voltage. The calculation of the cosmic ray event rate required the determination of

D. Binder; E. C. Smith; A. B. Holman

1975-01-01

483

Modeling galactic cosmic rays at lunar orbit  

Microsoft Academic Search

High-energy particles such as galactic cosmic rays (GCRs) and solar energetic particles (SEPs) have sufficient kinetic energy to produce undesirable biological effects in astronauts as well as environmental effects on spacecraft electronic systems. In low Earth orbit, such radiation effects are minimized owing to the strong geomagnetic cutoff from Earth's internal magnetic field. However, the risks increase at higher altitudes

Chia-Lin Huang; Harlan Spence; Brian Kress; Simon Shepherd

2008-01-01

484

The galactic habitable zone in barred galaxies  

Microsoft Academic Search

One of the criteria for the concept of a galactic habitable zone (GHZ) is that the pattern speed of the stars in the GHZ should be close to the pattern speed of the spiral arms. Another criteria is that the stars in it should have a high enough metallicity. In a barred galaxy, the GHZ will be more complicated to

M. Sundin

2006-01-01

485

Observations of diffuse galactic positron annihilation radiation  

NASA Astrophysics Data System (ADS)

The Galactic plane was scanned nearly three times by the University of California, San Diego/Massachusetts Inst. of Tech. (UCSD/MIT) Hard X-ray and Low Energy Gamma-Ray Experiment on HEAO-1 from August 1977 through September 1978. Its Medium Energy Detectors were of the NaI/CsI phoswich type and operated over the 100 keV to 2 MeV range, with a 17 deg Full Width at Half Maximum (FWHM) field of view and a 9% energy resolution at 511 keV. Sky maps for each epoch of observation were constructed in several energy bands. After subtraction of known point sources, a component associated with the galactic plane remains, whose spectrum is consistent with a power law and a positron annihilation spectrum. In the 333 to 583 keV energy band the flux is concentrated within +/- 35 deg of the galactic center, and the ratio of lux/radian (anticenter) is high, with a 2 sigma lower limit of 13. The parameters of the galactic center region's annihilation spectrum are positronium fraction of 0.9 +/- 0.1 and 511 keV flux of (2.0 +/- 0.7) x 10-3 photons/((sq cm(s)(rad)).

Briggs, M. S.; Gruber, D. E.; Matteson, J. L.; Peterson, L. E.

1993-12-01

486

Galactic FUV Extinction Determined Using FUSE  

Microsoft Academic Search

We present an extinction analysis of sight lines selected from all public FUSE observations of Galactic O and B stars. Over 90% of Milky Way extinction curves sampled from IR through UV wavelengths (UV coverage provided by IUE) conform to the CCM family of curves based on R(V), a single parameter linked to grain size (Cardelli, Clayton, & Mathis 1989,

Stefan Cartledge; Geoffrey Clayton; Karl Gordon; U. J. Sofia; Mike Wolff

2005-01-01

487

Colliding Galaxies Create Active Galactic Nuclei  

NASA Video Gallery

This simulation follows the collision of two spiral galaxies that harbor giant black holes. The collision merges the black holes and stirs up gas in both galaxies. The merged black hole gorges on the feast and lights up, forming an active galactic nucleus called a quasar and creating a "wind" that blows away much of the galaxy's gas.

gsfcvideo

2010-05-19

488

Grounding Ring for Ground Adapters.  

National Technical Information Service (NTIS)

The present invention relates to a grounding ring which may be used in ground adapters. The grounding ring has a structure resembling a miniature box girder with an irregular hexagonal cross section and a hollow toroidal configuration. The grounding ring ...

N. F. Schade

1991-01-01

489

ACCRETION DISKS IN ACTIVE GALACTIC NUCLEI: GAS SUPPLY DRIVEN BY STAR FORMATION  

SciTech Connect

Self-gravitating accretion disks collapse to star-forming (SF) regions extending to the inner edge of the dusty torus in active galactic nuclei (AGNs). A full set of equations including feedback of star formation is given to describe the dynamics of the regions. We explore the role of supernova explosions (SNexp), which act to excite turbulent viscosity, in the transportation of angular momentum in the regions within 1 pc scale. We find that accretion disks with typical rates in AGNs can be driven by SNexp in the regions and metals are produced spontaneously. The present model predicts a metallicity-luminosity relationship consistent with that observed in AGNs. As relics of SF regions, a ring (or belt) consisting of old stars remains for every episode of supermassive black hole activity. We suggest that multiple stellar rings with random directions interact and form a nuclear star cluster after episodes driven by star formation.

Wang Jianmin; Yan Changshuo; Gao Hanqin; Hu Chen; Li Yanrong; Zhang Shu [Key Laboratory for Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Beijing 100049 (China)

2010-08-20

490

Astrophysics of Galactic Charged Cosmic Rays  

NASA Astrophysics Data System (ADS)

A review is given of the main properties of the charged component of galactic cosmic rays, particles detected at Earth with an energy spanning from tens of MeV up to about 1019 eV. After a short introduction to the topic and a historical overview, the properties of cosmic rays are discussed with respect to different energy ranges. The origin and the propagation of nuclei in the Galaxy are dealt with from a theoretical point of view. The mechanisms leading to the acceleration of nuclei by supernova remnants and to their subsequent diffusion through the inhomogeneities of the galactic magnetic field are discussed, and some clue is given on the predictions and observations of fluxes of antimatter, both from astrophysical sources and from dark matter annihilation in the galactic halo.The experimental techniques and instrumentations employed for the detection of cosmic rays at Earth are described. Direct methods are viable up to ? 1014 eV, by means of experiments flown on balloons or satellites, while above that energy, due to their very low flux, cosmic rays can be studied only indirectly by exploiting the particle cascades they produce in the atmosphere.The possible physical interpretation of the peculiar features observed in the energy spectrum of galactic cosmic rays, and in particular the so-called "knee" at about 4 ×1015 eV, is discussed. A section is devoted to the region between about 1018 and 1019 eV, which is believed to host the transition between galactic and extragalactic cosmic rays. The conclusion gives some perspectives on the cosmic ray astrophysics field. Thanks to a wealth of different experiments, this research area is living a very flourishing era. The activity is exciting both from the theoretical and the instrumental sides, and its interconnection with astronomy, astrophysics, and particle physics experiences nonstop growth.

Castellina, Antonella; Donato, Fiorenza

491

Ringed-Carbon Compounds  

NSDL National Science Digital Library

In this interactive activity adapted from NOVA, learn about alkaloids and steroids, both examples of compounds with carbon rings. Short videos with interviews,animations, and photographs are featured.

Foundation, Wgbh E.

2007-02-12

492

A protein engagement RING  

PubMed Central

The mechanistic details of the attachment of a small protein, ubiquitin, to other proteins are unclear. Crystal structures of the E2–ubiquitin and RING E3 enzymes, engaged and ready for transfer, provide fresh insights.

Lima, Christopher D.; Schulman, Brenda A.

2013-01-01

493

Ring Buffered Network Bus.  

National Technical Information Service (NTIS)

This report describes the research effort to demonstrate the integration of a data sharing technology, Ring Buffered Network Bus, in development by Dryden Flight Research Center, with an engine simulation application, the Java Gas Turbine Simulator, in de...

1997-01-01

494

The Milky Way's Tiny but Tough Galactic Neighbour  

NASA Astrophysics Data System (ADS)

Today ESO announces the release of a stunning new image of one of our nearest galactic neighbours, Barnard's Galaxy, also known as NGC 6822. The galaxy contains regions of rich star formation and curious nebulae, such as the bubble clearly visible in the upper left of this remarkable vista. Astronomers classify NGC 6822 as an irregular dwarf galaxy because of its odd shape and relatively diminutive size by galactic standards. The strange shapes of these cosmic misfits help researchers understand how galaxies interact, evolve and occasionally "cannibalise" each other, leaving behind radiant, star-filled scraps. In the new ESO image, Barnard's Galaxy glows beneath a sea of foreground stars in the direction of the constellation of Sagittarius (the Archer). At the relatively close distance of about 1.6 million light-years, Barnard's Galaxy is a member of the Local Group, the archipelago of galaxies that includes our home, the Milky Way. The nickname of NGC 6822 comes from its discoverer, the American astronomer Edward Emerson Barnard, who first spied this visually elusive cosmic islet using a 125-millimetre aperture refractor in 1884. Astronomers obtained this latest portrait using the Wide Field Imager (WFI) attached to the 2.2-metre MPG/ESO telescope at ESO's La Silla Observatory in northern Chile. Even though Barnard's Galaxy lacks the majestic spiral arms and glowing, central bulge that grace its big galactic neighbours, the Milky Way, the Andromeda and the Triangulum galaxies, this dwarf galaxy has no shortage of stellar splendour and pyrotechnics. Reddish nebulae in this image reveal regions of active star formation, where young, hot stars heat up nearby gas clouds. Also prominent in the upper left of this new image is a striking bubble-shaped nebula. At the nebula's centre, a clutch of massive, scorching stars send waves of matter smashing into the surrounding interstellar material, generating a glowing structure that appears ring-like from our perspective. Other similar ripples of heated matter thrown out by feisty young stars are dotted across Barnard's Galaxy. At only about a tenth of the Milky Way's size, Barnard's Galaxy fits its dwarfish classification. All told, it contains about 10 million stars - a far cry from the Milky Way's estimated 400 billion. In the Local Group, as elsewhere in the Universe, however, dwarf galaxies outnumber their larger, shapelier cousins. Irregular dwarf galaxies like Barnard's Galaxy get their random, blob-like forms from close encounters with or "digestion" by other galaxies. Like everything else in the Universe, galaxies are in motion, and they often make close passes or even go through one another. The density of stars in galaxies is quite low, meaning that few stars physically collide during these cosmic dust-ups. Gravity's fatal attraction, however, can dramatically warp and scramble the shapes of the passing or crashing galaxies. Whole bunches of stars are pulled or flung from their galactic home, in turn forming irregularly shaped dwarf galaxies like NGC 6822. More information ESO, the European Southern Observatory, is the foremost intergovernmental astronomy organisation in Europe and the world's most productive astronomical observatory. It is supported by 14 countries: Austria, Belgium, the Czech Republic, Denmark, France, Finland, Germany, Italy, the Netherlands, Portugal, Spain, Sweden, Switzerland and the United Kingdom. ESO carries out an ambitious programme focused on the design, construction and operation of powerful ground-based observing facilities enabling astronomers to make important scientific discoveries. ESO also plays a leading role in promoting and organising cooperation in astronomical research. ESO operates three unique world-class observing sites in Chile: La Silla, Paranal and Chajnantor. At Paranal, ESO operates the Very Large Telescope, the world's most advanced visible-light astronomical observatory. ESO is the European partner of a revolutionary astronomical telescope ALMA, the largest astronomical project in existence. ESO is cur

2009-10-01

495

W43: the closest molecular complex of the Galactic bar?  

NASA Astrophysics Data System (ADS)

Context. In the framework of the multi-wavelength Galactic surveys of star-formation presently underway, complexes of molecular clouds that stretch over up to hundreds of parsecs are of particular interest. This is because a large population of stars is forming within them, thus all at the same distance from the Sun and under similar physical conditions. Aims: We study the Galactic plane between ?29.5 and 31.5 degrees of longitude, which is especially rich in terms of molecular clouds and star-formation activity. It is located within what is sometimes called the molecular ring and contains the Galactic mini-starburst region W43, as well as the prominent hot core G29.96-0.02 with its associated compact HII region. Methods: We used a large database extracted from Galaxy-wide surveys of HI, 13CO 1-0, 8 ?m, and 870 ?m continuum to trace diffuse atomic gas, low- to medium-density molecular gas, high-density molecular gas, and star-formation activity, which we complemented by dedicated 12CO 2-1, 3-2 observations of the region. Results: From the detailed 3D (space-space-velocity) analysis of the molecular and atomic cloud tracers through the region and despite its wide velocity range (FWHM ~ 22.3 km s-1 around VLSR ~ 95.9 km s-1), we identified W43 as a large (equivalent diameter ~140 pc) and coherent complex of molecular clouds that is surrounded by an atomic gas envelope (equivalent diameter ~290 pc). We measured both the total mass of this newly identified molecular complex (Mtotal ~ 7.1 × 106 M?) and the mass contained in dense 870 ?m clumps (<5 pc dense cloud structures, Mclumps ~ 8.4 × 105 M?), and conclude that W43 is particularly massive and concentrated. The distance that we assume for the W43 complex is 6 kpc from the Sun, which may place it at the meeting point of the Scutum-Centaurus (or Scutum-Crux) Galactic arm and the bar, a dynamically complex region where high-velocity streams could easily collide. We propose that the star-formation rate of W43 is not steady but increases from ~0.01 M? yr-1 (measured from its 8 ?m luminosity) to ~0.1 M? yr-1 (measured from its molecular content). From the global properties of W43, we claim that it is an extreme molecular complex in the Milky Way and it might even form starburst clusters in the near future. Conclusions: W43 is the perfect testbed to investigate (1) the star-formation process occuring through bursts as well as (2) the formation of such an extreme complex in the framework of converging flows scenarios. Appendix A is only available in electronic form at http://www.aanda.org

Nguyen Luong, Q.; Motte, F.; Schuller, F.; Schneider, N.; Bontemps, S.; Schilke, P.; Menten, K. M.; Heitsch, F.; Wyrowski, F.; Carlhoff, P.; Bronfman, L.; Henning, T.

2011-05-01

496

Realistic exact solution for the exterior field of a rotating neutron star  

SciTech Connect

A new six-parametric, axisymmetric, and asymptotically flat exact solution of Einstein-Maxwell field equations having reflection symmetry is presented. It has arbitrary physical parameters of mass, angular momentum, mass-quadrupole moment, current octupole moment, electric charge, and magnetic dipole, so it can represent the exterior field of a rotating, deformed, magnetized, and charged object; some properties of the closed-form analytic solution such as its multipolar structure, electromagnetic fields, and singularities are also presented. In the vacuum case, this analytic solution is matched to some numerical interior solutions representing neutron stars, calculated by Berti and Stergioulas [E. Berti and N. Stergioulas, Mon. Not. R. Astron. Soc. 350, 1416 (2004)], imposing that the multipole moments be the same. As an independent test of accuracy of the solution to describe exterior fields of neutron stars, we present an extensive comparison of the radii of innermost stable circular orbits (ISCOs) obtained from the Berti and Stergioulas numerical solutions, the Kerr solution [R. P. Kerr, Phys. Rev. Lett. 11, 237 (1963)], the Hartle and Thorne solution [J. B. Hartle and K. S. Thorne, Astrophys. J. 153, 807 (1968)], an analytic series expansion derived by Shibata and Sasaki [M. Shibata and M. Sasaki, Phys. Rev. D 58, 104011 (1998)], and our exact solution. We found that radii of ISCOs from our solution fits better than others with realistic numerical interior solutions.

Pachon, Leonardo A.; Rueda, Jorge A.; Sanabria-Gomez, Jose D. [Escuela de Fisica, Universidad Industrial de Santander, Colombia and Departamento de Fisica, Universidad Nacional, Bogota D.C. (Colombia); Escuela de Fisica, Universidad Industrial de Santander, A.A. 678, Bucaramanga, Colombia and Centro de Fisica Fundamental, Universidad de Los Andes, Merida, Merida 5101 (Venezuela); Escuela de Fisica, Universidad Industrial de Santander, A.A. 678, Bucaramanga (Colombia)

2006-05-15

497

Investigation about the effects of exterior surface paint color on temperature development in aboveground pipeline  

SciTech Connect

A practical analytical model for predicting temperature development of incompressible flow inside an aboveground pipeline has been constructed and presented in this research work. The outer surface of the pipeline is exposed to solar radiation and wind stream. The radiation heat exchange with ambient is also taken into account. The effects of exterior surface paint color represented by emissivity and absorptivity, have been studied. The model has been developed to study crude oil flow temperature development through a specific pipeline. The results obtained by the model show that the bulk temperature inclined to a limiting value in some distance which affected mainly by Reynolds numbers. It is found that emissivity and absorptivity of surface are predominant parameters in temperature development in an aboveground pipeline flow which can increase or decrease pipe surface and fluid temperature especially for low Reynolds number flow. Based on the results which indicated significantly of exterior surface paint color, one should choose the paint color by considering its effects on temperature development. (author)

Farzaneh-Gord, Mahmood; Rasekh, Alireza; Nabati, Amin; Saadat, Morteza [Faculty of Mechanical Engineering, Shahrood University of Technology, Shahrood (Iran, Islamic Republic of)

2010-12-15

498

Semitopological Q-Rings  

Microsoft Academic Search

Semitopological Vortices (Q-Rings) are identified to be classical soliton configurations whose stability is attributed to both topological and nontopological charges. We discuss some recent work on the simplest possible realization of such a configuration in a scalar field theory with an unbroken U(1) global symmetry. We show that Q-Rings correspond to local minima of the energy, exhibit numerical solutions of

Minos Axenidesa

499

Modeling Mushroom Fairy Rings  

NSDL National Science Digital Library

Sometimes in a forest or yard, mushrooms seem magically to grow in circles, which we call "fairy rings". In this module, we develop simulations for the expansion and interactions of such mushroom fairy rings. After analyzing the system, formulating the model, and considering appropriate rules for the spreading of mushrooms, we create a simulation using the graphical computer algebra system Mathematica. Projects involve various refinements of the model.

Shiflet, Angela B.; Shiflet, George W.

500

Rings dominate western Gulf  

Microsoft Academic Search

Surface and deep circulation of the central and western Gulf of Mexico is controlled by interactions of rings of water pinched from the gulf's Loop Current. The discovery was made by Mexican oceanographers who are preparing a full-color, 8-volume oceanographic atlas of the gulf.Anticyclonic warm-core rings pinch off the Loop Current at a rate of about one to two per

Francisco V. Vidal L; Victor M. V. Vidal L; José María Pérez Molero

1990-01-01