Science.gov

Sample records for galactic rings exterior

  1. The Arp Ring: Galactic or extragalactic?

    NASA Technical Reports Server (NTRS)

    Abolins, J. A.; Rice, W. L.

    1987-01-01

    The Arp Ring is a faint, loop-like structure around the northern end of M81 which becomes apparent only on deep optical photographs of the galaxy. The nature of the Ring and its proximity to M81 are uncertain. Is it simply foreground structure, part of this galaxy, or is it within the M81 system? Infrared Astronomy Satellite (IRAS) maps of the region show a far-infrared counterpart of the Ring. The infrared data are compared with previous optical and radio observations to try to ascertain its physical nature. The poor correlation found between the common infrared/optical structure and the distribution of extragalactic neutral hydrogen, and the fact that its infrared properties are indistinguishable from those of nearby galactic cirrus, imply that the Arp Ring is simply a ring structure in the galactic cirrus.

  2. MSX Infrared Dark Clouds in the BU-FCRAO Galactic Ring Survey: A Galactic Ring Population

    NASA Astrophysics Data System (ADS)

    Simon, R.; Shah, R. Y.; Rathborne, J.; Jackson, J. M.; Bania, T. M.; Clemens, D. P.; Heyer, M. H.

    2004-12-01

    Recent high resolution surveys with the ISO and MSX satellites have revealed a large number of Galactic clouds with significant extinction in the mid-infrared. The infrared (IR) dark clouds are characterized by high masses, high column densities, and low temperatures. Little is known, however, about their origin and distribution in the Galaxy. The BU-FCRAO Galactic Ring Survey (GRS), a high resolution survey of 13CO emission in the inner Milky Way, makes it possible to spectroscopically determine their distances, and hence sizes and masses, based on morphological correlation of IR extinction and GRS 13CO emission. We find that the majority of the IR dark clouds are concentrated in the Galactic Ring at a Galactocentric radius of 5 kpc. We suggest that the condensations in the most massive IR dark clouds represent high mass proto-clusters, or OB-associations in the making.

  3. ON RINGS AND STREAMS IN THE GALACTIC ANTI-CENTER

    SciTech Connect

    Li Jing; Deng Licai; Xu Yan; Newberg, Heidi Jo; Carlin, Jeffrey L.; Newby, Matthew; Willett, Benjamin A.; Luo Zhiquan E-mail: heidi@rpi.edu

    2012-10-01

    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 Degree-Sign < b < 22 Degree-Sign 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 {approx}15 km s{sup -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 Degree-Sign , 30 Degree-Sign ), at a distance of 10.9 kpc from the Sun.

  4. Physical Properties and Galactic Distribution of Molecular Clouds Identified in the Galactic Ring Survey

    NASA Astrophysics Data System (ADS)

    Roman-Duval, Julia; Jackson, James M.; Heyer, Mark; Rathborne, Jill; Simon, Robert

    2010-11-01

    We derive the physical properties of 580 molecular clouds based on their 12CO and 13CO line emission detected in the University of Massachusetts-Stony Brook (UMSB) and Galactic Ring surveys. We provide a range of values of the physical properties of molecular clouds, and find a power-law correlation between their radii and masses, suggesting that the fractal dimension of the interstellar medium is around 2.36. This relation, M = (228 ± 18) R 2.36 ± 0.04, allows us to derive masses for an additional 170 Galactic Ring Survey (GRS) molecular clouds not covered by the UMSB survey. We derive the Galactic surface mass density of molecular gas and examine its spatial variations throughout the Galaxy. We find that the azimuthally averaged Galactic surface density of molecular gas peaks between Galactocentric radii of 4 and 5 kpc. Although the Perseus arm is not detected in molecular gas, the Galactic surface density of molecular gas is enhanced along the positions of the Scutum-Crux and Sagittarius arms. This may indicate that molecular clouds form in spiral arms and are disrupted in the inter-arm space. Finally, we find that the CO excitation temperature of molecular clouds decreases away from the Galactic center, suggesting a possible decline in the star formation rate with Galactocentric radius. There is a marginally significant enhancement in the CO excitation temperature of molecular clouds at a Galactocentric radius of about 6 kpc, which in the longitude range of the GRS corresponds to the Sagittarius arm. This temperature increase could be associated with massive star formation in the Sagittarius spiral arm.

  5. PHYSICAL PROPERTIES AND GALACTIC DISTRIBUTION OF MOLECULAR CLOUDS IDENTIFIED IN THE GALACTIC RING SURVEY

    SciTech Connect

    Roman-Duval, Julia; Jackson, James M.; Heyer, Mark; Rathborne, Jill; Simon, Robert E-mail: jackson@bu.ed E-mail: heyer@astro.umass.ed

    2010-11-01

    We derive the physical properties of 580 molecular clouds based on their {sup 12}CO and {sup 13}CO line emission detected in the University of Massachusetts-Stony Brook (UMSB) and Galactic Ring surveys. We provide a range of values of the physical properties of molecular clouds, and find a power-law correlation between their radii and masses, suggesting that the fractal dimension of the interstellar medium is around 2.36. This relation, M = (228 {+-} 18) R {sup 2.36{+-}0.04}, allows us to derive masses for an additional 170 Galactic Ring Survey (GRS) molecular clouds not covered by the UMSB survey. We derive the Galactic surface mass density of molecular gas and examine its spatial variations throughout the Galaxy. We find that the azimuthally averaged Galactic surface density of molecular gas peaks between Galactocentric radii of 4 and 5 kpc. Although the Perseus arm is not detected in molecular gas, the Galactic surface density of molecular gas is enhanced along the positions of the Scutum-Crux and Sagittarius arms. This may indicate that molecular clouds form in spiral arms and are disrupted in the inter-arm space. Finally, we find that the CO excitation temperature of molecular clouds decreases away from the Galactic center, suggesting a possible decline in the star formation rate with Galactocentric radius. There is a marginally significant enhancement in the CO excitation temperature of molecular clouds at a Galactocentric radius of about 6 kpc, which in the longitude range of the GRS corresponds to the Sagittarius arm. This temperature increase could be associated with massive star formation in the Sagittarius spiral arm.

  6. The BU-FCRAO Milky Way Galactic Ring Survey

    NASA Astrophysics Data System (ADS)

    Shah, R. Y.; Simon, R.; Flynn, E.; Jackson, J. M.; Bania, T. M.; Clemens, D. P.; Heyer, M. H.; Johnson, A.; Kolpak, M.; McQuinn, K.; Fox, O.; Kubiszewski, I.; Nero, D.; Rogers, K.; Veach, T.

    2002-12-01

    The Milky Way Galactic Ring Survey (GRS) continues to map J=1-> 0 13CO emission in the First Galactic Quadrant with an excellent combination of sensitivity (0.2 K), angular resolution (45''), and spectral resolution (0.2 km/s). Here we present the integrated intensity image and channel maps of our Second Release data (www.bu.edu/grs), covering 16 square degrees from l=40o to 51o and b=-1o to 0.5o. We also display maps of the 12CO/13CO intensity ratio using the UMASS-Stony Brook 12CO survey. In addition to confirming the widely accepted 12CO/13CO intensity ratio for the CO isotopes of 5-6 for the bulk of the Galactic emission seen from molecular clouds, we also find a significantly lower value of I(12CO)/I(13CO)=3 toward infrared-dark clouds (IRDCs) identified by Simon et al. Such low values suggest very large CO opacities and molecular column densities for the IRDCs. This work is supported by the National Science Foundation via grants AST-9800334 and AST-0098562 and the National Aeronautics and Space Administration via grant NAG5-10808.

  7. The Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey

    NASA Astrophysics Data System (ADS)

    Jackson, J. M.; Rathborne, J. M.; Shah, R. Y.; Simon, R.; Bania, T. M.; Clemens, D. P.; Chambers, E. T.; Johnson, A. M.; Dormody, M.; Lavoie, R.; Heyer, M. H.

    2006-03-01

    The Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey is a new survey of Galactic 13CO J=1-->0 emission. The survey used the SEQUOIA multipixel array on the Five College Radio Astronomy Observatory 14 m telescope to cover a longitude range of l=18deg-55.7d and a latitude range of |b|<1deg, a total of 75.4 deg2. Using both position-switching and On-The-Fly mapping modes, we achieved an angular sampling of 22", better than half of the telescope's 46" angular resolution. The survey's velocity coverage is -5 to 135 km s-1 for Galactic longitudes l<=40deg and -5 to 85 km s-1 for Galactic longitudes l>40deg. At the velocity resolution of 0.21 km s-1, the typical rms sensitivity is σ(T*A)~0.13 K. The survey comprises a total of 1,993,522 spectra. We show integrated intensity images (zeroth moment maps), channel maps, position-velocity diagrams, and an average spectrum of the completed survey data set. We also discuss the telescope and instrumental parameters, the observing modes, the data reduction processes, and the emission and noise characteristics of the data set. The Galactic Ring Survey data are available to the community online or in DVD form by request.

  8. Ammonia in the neutral ring around the galactic center

    NASA Astrophysics Data System (ADS)

    Serabyn, E.; Guesten, R.

    1986-06-01

    Several metastable NH3 lines have been detected from the molecular gas which orbits about the center of our galaxy at radii ⪆2 pc. A rotational temperature of ≡95K is estimated for this gas, implying a kinetic temperature of 240±100K. Several spectral features arising from gas along the line of sight to the center have also been detected. Gas at 40 km s-1 is seen in absorption in the higher lying inversion transitions. From a comparison of the excitation temperatures of the levels with the background continuum temperature, the density of this gas is estimated to be ≡1 - 3x104cm-3. Also seen are NH3 absorption features at -135, -51, -30 and -3 km s-1, associated with the "expanding molecular ring at 300 pc" and with the spiral structure of our galaxy. The three lower velocity features have Trot ⪉ 14 - 19K.

  9. Formation of ring structures in galactic disks during close passages of galaxies

    NASA Astrophysics Data System (ADS)

    Tutukov, A. V.; Fedorova, A. V.

    2016-01-01

    The formation of ring structures in galactic disks is investigated. It is shown that, in addition to the known mechanism of forming rings in "head-on" collisions between galaxies, ring structures can be formed during close passages of galaxies if the perturbing galaxy moves in a plane close to the equatorial plane of the perturbed disk galaxy, opposite to the direction of rotation of the disk. Numerical simulations of the formation of structures in the disk of a massive galaxy undergoing a passage with another galaxy are considered. The results of these cmputations show the formation of pronounced ring structures in the galactic disk when the initial inclination of the trajectory of the perturbing galaxy to the equatorial plane of the perturbed galaxy is no more than ~25°. However, the probability of close passages of galaxies with these parameters is small, as is the probability of head-on collisions. The characteristic time scale for the existence of pronounced rings is of order the dynamical time scale at the edge of the galaxy, 200-300 million years, close to the corresponding time for head-on collisions. The evolution of the rings has the same character in both cases: they gradually expand and move toward the periphery of the galaxy. The results of these simulations can also be applied to a close passage of one star by another star with a protoplanetary disk. According to the computation results, the characteristic time scale for the existence of pronounced rings in such a protoplanetary disk depends mainly on the size of the disk; this time scale can reach several tens of thousands of years for a disk radius of about 1000 AU. The formation of ring structures in such a disk could influence the formation and evolution of planetesimals, and possibly the character of the formation of planets and the distribution of their orbital semi-major axes.

  10. Storage Rings in the Sky: Gamma Ray Bursts and Galactic Gravitational Collapse Stored Energy

    NASA Astrophysics Data System (ADS)

    Greyber, H. D.

    2004-05-01

    The recent discovery of almost 100% polarization of the prompt gamma ray emission from GRB021206, (1), confirms my 44 year old ``Strong" Magnetic Field" model (SMF) for galactic dynamics. In SMF, Storage Ring particles were accelerated long ago during the original gravitational collapse of the pregalactic/prequasar plasma cloud that is permeated by an almost uniform primordial magnetic field (2,3) The enormous, intense, slender, relativistic, stable, completely coherent Storage Ring stores a very small fraction of the huge galactic gravitational collapse energy in an almost radiationless state, unless disturbed. The concept of an Astrophysical Storage Ring was introduced by me in l961. At first it was to explain galactic structure, but soon it proved useful to explain active galactic nuclei (AGN) and the dynamics of quasar/AGN jets. AGN and galactic morphology, energetics and dynamics vary as the ratio of magnetic energy to rotational energy in the particular object. Gamma ray bursts (GRB) are due simply to a ``rock". i.e. a white dwarf, ordinary star, neutron sstar, asteroid, planet, etc. falling rapidly through the Storage Ring and being almost instantly vaporized into a hot plasma fireball, causing an electromagnetic shower (2) Then the fireball speeds into the huge organized magnetic field surrounding the current ring, thus generating very highly polarized prompt gamma ray emission (as seen in GRB021206) from the synchrotron radiation process. The timing fits the GRB observations nicely. For instance, a ``rock" racing at 1000 kilometers per second across a 20,000 km. path in the beam would produce a twenty second burst. Other times, a target might track across a short chord for a short burst. Space missions have shown that often typical currents in space plasmas are made up of slender filaments. Thus the puzzling less than one millisecond spikes observed in some GRB are simply describing the structure of that particular ring current at that particular time. 1

  11. Modelling the formation of the circumnuclear ring in the Galactic centre

    NASA Astrophysics Data System (ADS)

    Mapelli, Michela; Trani, Alessandro A.

    2016-01-01

    Several thousand solar masses of molecular, atomic, and ionized gas lie in the innermost ~10 pc of our Galaxy. The most relevant structure of molecular gas is the circumnuclear ring (CNR), a dense and clumpy ring surrounding the supermassive black hole (SMBH), with a radius of ~2 pc. We propose that the CNR formed through the tidal disruption of a molecular cloud, and we investigate this scenario by means of N-body smoothed-particle hydrodynamics simulations. We ran a grid of simulations, varying cloud mass (4 × 104, 1.3 × 105M⊙), initial orbital velocity (vin = 0.2-0.5 vesc, where vesc is the escape velocity from the SMBH), and impact parameter (b = 8, 26 pc). The disruption of the molecular cloud leads to the formation of very dense and clumpy gas rings containing most of the initial cloud mass. If the initial orbital velocity of the cloud is sufficiently low (vin< 0.4 vesc, for b = 26 pc) or the impact parameter is sufficiently small (b ≲ 10 pc, for vin> 0.5 vesc), at least two rings form around the SMBH: an inner ring (with radius ~0.4 pc) and an outer ring (with radius ~2-4 pc). The inner ring forms from low-angular momentum material that engulfs the SMBH during the first periapsis passage, while the outer ring forms later, during the subsequent periapsis passages of the disrupted cloud. The inner and outer rings are misaligned by ~24 degrees because they form from different gas streamers, which are affected by the SMBH gravitational focusing in different ways. The outer ring matches several properties (mass, rotation velocity, temperature, clumpiness) of the CNR in our Galactic centre. We speculate that the inner ring might account for the neutral gas observed in the central cavity.

  12. The chemical composition of Galactic ring nebulae around massive stars

    NASA Astrophysics Data System (ADS)

    Esteban, C.; Mesa-Delgado, A.; Morisset, C.; García-Rojas, J.

    2016-08-01

    We present deep spectra of ring nebulae associated with Wolf-Rayet (WR) and O-type stars: NGC 6888, G2.4+1.4, RCW 58, S 308, NGC 7635 and RCW 52. The data have been taken with the 10m Gran Telescopio Canarias and the 6.5m Clay Telescope. We extract spectra of several apertures in some of the objects. We derive C$^{++}$ and O$^{++}$ abundances from faint recombination lines in NGC 6888 and NGC 7635, permitting to derive their C/H and C/O ratios and estimate the abundance discrepancy factor (ADF) of O$^{++}$. The ADFs are larger than the typical ones of normal HII regions but similar to those found in the ionised gas of star-forming dwarf galaxies. We find that chemical abundances are rather homogeneous in the nebulae where we have spectra of several apertures: NGC 6888, NGC 7635 and G2.4+1.4. We obtain very high values of electron temperature in a peripheral zone of NGC 6888, finding that shock excitation can reproduce its spectral properties. We find that all the objects associated with WR stars show N enrichment. Some of them also show He enrichment and O deficiency as well as a lower Ne/O than expected, this may indicate the strong action of the ON and NeNa cycles. We have compared the chemical composition of NGC 6888, G2.4+1.4, RCW 58 and S 308 with the nucleosynthesis predicted by stellar evolution models of massive stars. We find that non-rotational models of stars of initial masses between 25 and 40 solar masses seem to reproduce the observed abundance ratios of most of the nebulae.

  13. The chemical composition of Galactic ring nebulae around massive stars

    NASA Astrophysics Data System (ADS)

    Esteban, C.; Mesa-Delgado, A.; Morisset, C.; García-Rojas, J.

    2016-08-01

    We present deep spectra of ring nebulae associated with Wolf-Rayet (WR) and O-type stars: NGC 6888, G2.4+1.4, RCW 58, S 308, NGC 7635 and RCW 52. The data have been taken with the 10m Gran Telescopio Canarias and the 6.5m Clay Telescope. We extract spectra of several apertures in some of the objects. We derive C2+ and O2+ abundances from faint recombination lines in NGC 6888 and NGC 7635, permitting to derive their C/H and C/O ratios and estimate the abundance discrepancy factor (ADF) of O2+. The ADFs are larger than the typical ones of normal H II regions but similar to those found in the ionized gas of star-forming dwarf galaxies. We find that chemical abundances are rather homogeneous in the nebulae where we have spectra of several apertures: NGC 6888, NGC 7635 and G2.4+1.4. We obtain very high values of electron temperature in a peripheral zone of NGC 6888, finding that shock excitation can reproduce its spectral properties. We find that all the objects associated with WR stars show N enrichment. Some of them also show He enrichment and O deficiency as well as a lower Ne/O than expected, this may indicate the strong action of the ON and NeNa cycles. We have compared the chemical composition of NGC 6888, G2.4+1.4, RCW 58 and S 308 with the nucleosynthesis predicted by stellar evolution models of massive stars. We find that non-rotational models of stars of initial masses between 25 and 40 M⊙ seem to reproduce the observed abundance ratios of most of the nebulae.

  14. Kinematic Distances to Molecular Clouds Identified in the Galactic Ring Survey

    NASA Astrophysics Data System (ADS)

    Roman-Duval, Julia; Jackson, James M.; Heyer, Mark; Johnson, Alexis; Rathborne, Jill; Shah, Ronak; Simon, Robert

    2009-07-01

    Kinematic distances to 750 molecular clouds identified in the 13CO J = 1 → 0 Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey (GRS) are derived assuming the Clemens rotation curve of the Galaxy. The kinematic distance ambiguity is resolved by examining the presence of H I self-absorption toward the 13CO emission peak of each cloud using the Very Large Array Galactic Plane Survey. We also identify 21 cm continuum sources embedded in the GRS clouds in order to use absorption features in the H I 21 cm continuum to distinguish between near and far kinematic distances. The Galactic distribution of GRS clouds is consistent with a four-arm model of the Milky Way. The locations of the Scutum-Crux and Perseus arms traced by GRS clouds match star-count data from the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire star-count data. We conclude that molecular clouds must form in spiral arms and be short-lived (lifetimes < 107 yr) in order to explain the absence of massive, 13CO bright molecular clouds in the interarm space.

  15. THE CHEMICAL EVOLUTION OF THE MONOCEROS RING/GALACTIC ANTICENTER STELLAR STRUCTURE

    SciTech Connect

    Chou Meiyin; Majewski, Steven R.; Patterson, Richard J.; Cunha, Katia; Smith, Verne V.; MartInez-Delgado, David E-mail: srm4n@virginia.ed E-mail: cmy@asiaa.sinica.edu.t E-mail: vsmith@noao.ed

    2010-09-01

    The origin of the Galactic Anticenter Stellar Structure (GASS) or 'Monoceros Ring' - a low-latitude overdensity at the edge of the Galactic disk spanning at least the second and third Galactic quadrants-remains controversial. Models for the origin of GASS generally fall into scenarios where either it is a part (e.g., warp) of the Galactic disk or it represents tidal debris from the disruption of a Milky Way (MW) satellite galaxy. To further constrain models for the origin of GASS, we derive chemical abundance patterns from high-resolution spectra for 21 M giants spatially and kinematically identified with it. The abundances of the (mostly) {alpha}-element, titanium, and s-process elements, yttrium and lanthanum, for these GASS stars are found to be lower at the same [Fe/H] than those for MW stars, but similar to those of stars in the Sagittarius stream, other dwarf spheroidal galaxies, and the Large Magellanic Cloud. This demonstrates that GASS stars have a chemical enrichment history typical of dwarf galaxies-and unlike those of typical MW stars (at least MW stars near the Sun). Nevertheless, these abundance results cannot definitively rule out the possibility that GASS was dynamically created out of a previously formed, outer MW disk because {Lambda}CDM-based structure formation models show that galactic disks grow outward by accretion of dwarf galaxies. On the other hand, the chemical patterns seen in GASS stars do provide striking verification that accretion of dwarf galaxies has indeed happened at the edge of the MW disk.

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

    NASA Astrophysics Data System (ADS)

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

    2013-11-01

    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.

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

    SciTech Connect

    Molinari, S.; Di Giorgio, A. M.; Elia, D.; Pestalozzi, M.; Pezzuto, S.; Bally, J.; Noriega-Crespo, A.; Compiegne, M.; Bernard, J. P.; Paradis, D.; Martin, P.; Testi, L.; Barlow, M.; Swinyard, B.; Moore, T.; Plume, R.; Zavagno, A.; Calzoletti, L.; Faustini, F.; Natoli, P.

    2011-07-10

    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.

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

    SciTech Connect

    Rathborne, J. M.; Johnson, A. M.; Jackson, J. M.; Shah, R. Y.; Simon, R. E-mail: alexj@bu.edu E-mail: ronak@bu.edu

    2009-05-15

    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.

  19. Molecular Clouds and Clumps in the Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey

    NASA Astrophysics Data System (ADS)

    Rathborne, J. M.; Johnson, A. M.; Jackson, J. M.; Shah, R. Y.; Simon, R.

    2009-05-01

    The Boston University-Five College Radio Astronomy Observatory (BU-FCRAO) Galactic Ring Survey (GRS) of 13CO J = 1 → 0 emission covers Galactic longitudes 18° < ell < 55fdg7 and Galactic latitudes |b| <= 1°. Using the SEQUOIA array on the FCRAO 14 m telescope, the GRS fully sampled the 13CO Galactic emission (46'' angular resolution on a 22'' grid) and achieved a spectral resolution of 0.21 km s-1. Because the GRS uses 13CO, an optically thin tracer, rather than 12CO, 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 13CO 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.

  20. SOFIA/FORCAST IMAGING OF THE CIRCUMNUCLEAR RING AT THE GALACTIC CENTER

    SciTech Connect

    Lau, R. M.; Herter, T. L.; Adams, J. D.; Morris, M. R.; Becklin, E. E.

    2013-09-20

    We present 19.7, 31.5, and 37.1 μm images of the inner 6 pc of the Galactic center of the Milky Way with a spatial resolution of 3.''2-4.''6 taken by the Faint Object Infrared Camera on the Stratospheric Observatory for Infrared Astronomy. The images reveal in detail the 'clumpy' structure of the circumnuclear ring (CNR)—the inner edge of the molecular torus orbiting the supermassive black hole at the Galactic center—and the prominent streamers of hot, ionized gas and dust within the CNR that compose the H II region Sgr A West. The CNR exhibits features of a classic H II region: the dust emission at 19.7 μm closely traces the ionized gas emission observed in the radio while the 31.5 and 37.1 μm emission traces the photo-dissociation region beyond the ionized gas. The 19.7/37.1 color temperature map reveals a radial temperature gradient across the CNR with temperatures ranging from 65 to 85 K, consistent with the prevailing paradigm in which the dust is centrally heated by the inner cluster of hot, young stars. We model the 37.1 μm intensity of the CNR as an inclined (θ{sub i} = 67°) ring with a thickness and radius of 0.34 pc and 1.4 pc, respectively, and find that it is consistent with the observed 37.1 μm map of the CNR. The 37.1 μm optical depth map also reveals the clumpy dust distribution of the CNR and implies a total gas mass of ∼610 M{sub ☉}. Dense (5-9 × 10{sup 4} cm{sup –3}) clumps with an FWHM of ∼0.15 pc exist along the inner edge of the CNR and shadow the material deeper into the ring. We find that the clumps are unlikely to be long-lived structures since they are not dense enough to be stable against tidal shear from the supermassive black hole and will be sheared out on a timescale of an orbital period (∼10{sup 5} yr)

  1. Simulation of the Galactic Cosmic Rays interaction with Saturn's atmosphere and rings

    NASA Astrophysics Data System (ADS)

    Kotova, Anna; Roussos, Elias; Dandouras, Iannis; Krupp, Norbert

    In 2004 Cassini spacecraft during the orbital insertion measured by the Ion and Neutron Camera significant fluxes of the energetic neutral atoms (ENA) coming from the area between the D-ring and the Saturn’s atmosphere, what brought up the idea of the possible existence of the innermost radiation belt in this narrow gap. In the present study we estimate the possible sources for this radiation belt, assuming the two main processes: the double charge exchange of the ENAs, coming from the middle magnetosphere, what can bring the keV ions to the region of our interest, and the interaction of the Galactic Cosmic Rays (GCR) with the Saturn’s atmosphere and rings, which due to CRAND process can produce the keV-MeV ions or electrons in the region. Both of these possible sources are possible to evaluate using the charged particle tracer, which we developed in our group. It works in different modes (Newton-Lorentz full equation of motion, guiding center or bounce averaged approximations), and allows use of different magnetic field models (from simple dipole magnetic field till complex realistic magnetic field model like Khurana model of Saturn’s magnetosphere) for both forward and backward tracing simulations. This charged particle tracer was validated using the comparison of the simulation results and observations during several flybys of Cassini by icy moons of Saturn. Through the backward-tracing of GCRs around the planet we evaluate how the ring shadow filters the GCR spectrum that hits the Saturn’s atmosphere and how non-dipolar effects change the Strömer cutoff rigidities of GCRs, especially for the high-latitude atmosphere that maps magnetically in the outer magnetosphere. Also we estimate the production of secondaries (and from the multiple impacts of these secondaries on the rings or atmosphere as well) and evaluate the energy spectrum of neutrons, the decay of which leads to the production of final CRAND elements in the inner Saturnian radiation belts

  2. Characterizing the Galactic warp with Gaia - I. The tilted ring model with a twist

    NASA Astrophysics Data System (ADS)

    Abedi, Hoda; Mateu, Cecilia; Aguilar, Luis A.; Figueras, Francesca; Romero-Gómez, Mercè

    2014-08-01

    We explore the possibility of detecting and characterizing the warp of the stellar disc of our Galaxy using synthetic Gaia data. The availability of proper motions and, for the brightest stars radial velocities, adds a new dimension to this study. A family of Great Circle Cell Counts methods is used. They are ideally suited to find the tilt and twist of a collection of rings, which allow us to detect and measure the warp parameters. To test them, we use random realizations of test particles which evolve in a realistic Galactic potential warped adiabatically to various final configurations. In some cases a twist is introduced additionally. The Gaia selection function, its errors model and a realistic 3D extinction map are applied to mimic three tracer populations: OB, A and red clump stars. We show how the use of kinematics improves the accuracy in the recovery of the warp parameters. The OB stars are demonstrated to be the best tracers determining the tilt angle with accuracy better than ˜0.5 up to Galactocentric distance of ˜16 kpc. Using data with good astrometric quality, the same accuracy is obtained for A-type stars up to ˜13 kpc and for red clump up to the expected stellar cut-off. Using OB stars the twist angle is recovered to within <3° for all distances.

  3. Evidence of the Galactic outer ring R1R2' from young open clusters and OB-associations

    NASA Astrophysics Data System (ADS)

    Mel'nik, A. M.; Rautiainen, P.; Glushkova, E. V.; Dambis, A. K.

    2016-02-01

    The distribution of young open clusters in the Galactic plane within 3 kpc from the Sun suggests the existence of the outer ring R1R2' in the Galaxy. The optimum value of the solar position angle with respect to the major axis of the bar, θb, providing the best agreement between the distribution of open clusters and model particles is θb=35±10°. The kinematical features obtained for young open clusters and OB-associations with negative Galactocentric radial velocity VR indicate the solar location near the descending segment of the outer ring R2.

  4. Northeastern Exterior, Northwestern Exterior, & Southwestern Exterior Elevations, Northeastern Interior, ...

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

    Northeastern Exterior, Northwestern Exterior, & Southwestern Exterior Elevations, Northeastern Interior, Southeastern Interior, & Southwestern Interior Elevations, Floor Plan, and Eastern Corner Detail - Manatoc Reservation, Vale Edge Adirondack, 1075 Truxell Road, Peninsula, Summit County, OH

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

    SciTech Connect

    Chu, Y.

    1982-03-15

    We have obtained narrow-band interference filter photographs and high resolution Fabry-Perot spectra 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% 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.

  6. Structure formation in gas-rich galactic discs with finite thickness: from discs to rings

    NASA Astrophysics Data System (ADS)

    Behrendt, M.; Burkert, A.; Schartmann, M.

    2015-03-01

    Gravitational instabilities play an important role in structure formation of gas-rich high-redshift disc galaxies. In this paper, we revisit the axisymmetric perturbation theory and the resulting growth of structure by taking the realistic thickness of the disc into account. In the unstable regime, which corresponds for thick discs to a Toomre parameter below the critical value Q0, crit = 0.696, we find a fastest growing perturbation wavelength that is always a factor 1.93 times larger than in the classical razor-thin disc approximation. This result is independent of the adopted disc scaleheight and by this independent of temperature and surface density. In order to test the analytical theory, we compare it with a high-resolution hydrodynamical simulation of an isothermal gravitationally unstable gas disc with the typical vertical sech2 density profile and study its break up into rings that subsequently fragment into dense clumps. In the first phase, rings form, that organize themselves discretely, with distances corresponding to the local fastest growing perturbation wavelength. We find that the disc scaleheight has to be resolved initially with five or more grid cells in order to guarantee proper growth of the ring structures, which follow the analytical prediction. These rings later on contract to a thin and dense line, while at the same time accreting more gas from the inter-ring region. It is these dense, circular filaments, that subsequently fragment into a large number of clumps. Contrary to what is typically assumed, the clump sizes are therefore not directly determined by the fastest growing wavelength.

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

    SciTech Connect

    Roman-Duval, Julia; Jackson, James; Federrath, Christoph; Klessen, Ralf S.; Brunt, Christopher; Heyer, Mark E-mail: jackson@bu.edu E-mail: chfeder@uni-heidelberg.de E-mail: heyer@astro.umass.edu

    2011-10-20

    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.

  8. Rings

    SciTech Connect

    Davis, R.L.

    1989-01-01

    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.

  9. 28. EXTERIOR CAN CONVEYOR Exterior section of empty can ...

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

    28. EXTERIOR - CAN CONVEYOR Exterior section of empty can conveyor which transported cans from the third floor of the main warehouse (right) to the canning area. - Hovden Cannery, 886 Cannery Row, Monterey, Monterey County, CA

  10. Saturn's Spectacular Ring System

    NASA Technical Reports Server (NTRS)

    Lissauer, Jack J.; DeVincenzi, Donald (Technical Monitor)

    2001-01-01

    Saturn's beautiful rings have fascinated astronomers since they were first observed by Galileo in 1610. The main rings consist of solid particles mostly in the 1 cm - 10 m range, composed primarily of water ice. The ring disk is exceptionally thin - the typical local thickness of the bright rings is tens of meters, whereas the diameter of the main rings is 250,000 km! The main rings exhibit substantial radial variations "ringlets", many of which are actively maintained via gravitational perturbations from Saturn's moons. Exterior to the main rings lie tenuous dust rings, which have little mass but occupy a very large volume of space. This seminar will emphasize the physics of ring-moon interactions, recent advances in our understanding of various aspects of the rings obtained from observations taken during 1995 when the rings appeared edge-on to the Earth and then to the Sun, and observations in subsequent years from HST.

  11. 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)

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

    2013-06-01

    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 ζ˜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).

  12. Exterior view looking down through the approximate centerline of the ...

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

    Exterior view looking down through the approximate centerline of the upper hatch and docking ring on the external airlock on the Orbiter Discovery. This photograph was take in the Orbiter Processing Facility at the Kennedy Space Center. - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  13. 1. VIEW LOOKING SOUTHEAST AT EXTERIOR OF 8FOOT TRANSONIC PRESSURE ...

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

    1. VIEW LOOKING SOUTHEAST AT EXTERIOR OF 8-FOOT TRANSONIC PRESSURE TUNNEL. NOTE EXPANSION RINGS. - NASA Langley Research Center, 8-Foot Transonic Pressure Tunnel, 640 Thornell Avenue, Hampton, Hampton, VA

  14. Planetary Rings

    NASA Astrophysics Data System (ADS)

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

    2002-08-01

    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 elegant examples of Lindblad and corotation resonances (first invoked in the context of galactic disks), electromagnetic resonances, spiral density waves and bending waves, narrow ringlets which exhibit internal modes due to collective instabilities, sharp-edged gaps maintained via tidal torques from embedded moonlets, and tenuous dust belts created by meteoroid impact onto, or collisions between, parent bodies. Yet, as far as we have come, our understanding is far from complete. The fundamental questions confronting ring scientists at the beginning of the twenty-first century are those regarding the origin, age and evolution of the various ring systems, in the broadest context. Understanding the origin and age requires us to know the current ring properties, and to understand the dominant evolutionary processes and how they influence ring properties. Here we discuss a prioritized list of the key questions, the answers to which would provide the greatest improvement in our understanding of planetary rings. We then outline the initiatives, missions, and other supporting activities needed to address those questions, and recommend priorities for the coming decade in planetary ring science.

  15. Sunshade for building exteriors

    DOEpatents

    Braunstein, Richard; McKenna, Gregory B.; Hewitt, David W.; Harper, Randolph S.

    2002-01-01

    A sunshade for shading window exteriors includes at least one connecting bracket for attachment to a window mullion, a blade support strut attached to the connecting bracket at a first joint, and a plurality of louvered blades supported by the blade support strut at a second joint. The pivot angle at the first joint may be varied to extend the louvered blades a desired distance from the window mullion. The louvered blades are positioned at a preselected fixed profile angle on the second joint in order to optimize shading at the latitude where the sunshade is installed. In a preferred embodiment, the louvered blades have top walls supporting photovoltaic cells and the sunshade includes electric cables for connecting the photovoltaic cells to an electric circuit.

  16. Exterior dimension of fat fractals

    NASA Technical Reports Server (NTRS)

    Grebogi, C.; Mcdonald, S. W.; Ott, E.; Yorke, J. A.

    1985-01-01

    Geometric scaling properties of fat fractal sets (fractals with finite volume) are discussed and characterized via the introduction of a new dimension-like quantity which is called the exterior dimension. In addition, it is shown that the exterior dimension is related to the 'uncertainty exponent' previously used in studies of fractal basin boundaries, and it is shown how this connection can be exploited to determine the exterior dimension. Three illustrative applications are described, two in nonlinear dynamics and one dealing with blood flow in the body. Possible relevance to porous materials and ballistic driven aggregation is also noted.

  17. Latch ring for connecting tubular member

    SciTech Connect

    Milberger, L.J.

    1991-06-04

    This patent describes a device for releasably locking an inner member well bore of a tubular outer member, comprising a combination of a grooved inner member profile formed on the exterior of the inner member; a grooved outer member profile formed in the bore of the outer member; a split ring carried by the inner member the ring having a grooved outer profile on its exterior mates with the outer member profile; and the inner member being axially movable.

  18. Galactic dynamos

    NASA Astrophysics Data System (ADS)

    Moss, David

    There is a broad agreement between the predictions of galactic dynamo theory and observations; although there are still some unresolved difficulties, the theory appears to be robust. Now attention is turning from generic models to studies of particular features of the large-scale magnetic fields, and also to models for specific galaxies. The effects of noncircular flows, for example driven by the interaction of spiral arms and galactic bars with the dynamo, are of current interest.

  19. Uranus - Beneath that bland exterior

    NASA Technical Reports Server (NTRS)

    Simpson, Richard A.; Miner, Ellis D.

    1989-01-01

    Findings made by the Voyager missions regarding the atmosphere, magnetic field, rings, and satellites of Uranus are reviewed. The reasons for the bland appearance of the planet are addressed, and the use of radio and infrared instruments to determine the rotational speeds of the planet and atmosphere, the equatorial radius, and the atmospheric temperature is discussed. The corkscrew magnetic field and the dark, almost dust-free rings are described. The most significant features of the largest Uranian moons are mentioned.

  20. Galactic Winds

    NASA Astrophysics Data System (ADS)

    Veilleux, Sylvain

    Galactic winds have become arguably one of the hottest topics in extragalactic astronomy. This enthusiasm for galactic winds is due in part to the detection of winds in many, if not most, high-redshift galaxies. Galactic winds have also been invoked by theorists to (1) suppress the number of visible dwarf galaxies and avoid the "cooling catastrophe" at high redshift that results in the overproduction of massive luminous galaxies, (2) remove material with low specific angular momentum early on and help enlarge gas disks in CDM + baryons simulations, (3) reduce the dark mass concentrations in galaxies, (4) explain the mass-metallicity relation of galaxies from selective loss of metal-enriched gas from smaller galaxies, (5) enrich and "preheat" the ICM, (6) enrich the IGM without disturbing the Lyαforest significantly, and (7) inhibit cooling flows in galaxy clusters with active cD galaxies. The present paper highlights a few key aspects of galactic winds taken from a recent ARAA review by Veilleux, Cecil, &Bland-Hawthorn (2005; herafter VCBH). Readers interested in a more detailed discussion of this topic are encouraged to refer to the original ARAA article.

  1. Planetary Rings

    NASA Astrophysics Data System (ADS)

    Esposito, Larry

    2014-03-01

    Preface: a personal view of planetary rings; 1. Introduction: the allure of the ringed planets; 2. Studies of planetary rings 1610-2013; 3. Diversity of planetary rings; 4. Individual ring particles and their collisions; 5. Large-scale ring evolution; 6. Moons confine and sculpt rings; 7. Explaining ring phenomena; 8. N-body simulations; 9. Stochastic models; 10. Age and evolution of rings; 11. Saturn's mysterious F ring; 12. Uranus' rings and moons; 13. Neptune's partial rings; 14. Jupiter's ring-moon system after Galileo and New Horizons; 15. Ring photometry; 16. Dusty rings; 17. Concluding remarks; Afterword; Glossary; References; Index.

  2. Magnetic fields in ring galaxies

    NASA Astrophysics Data System (ADS)

    Moss, D.; Mikhailov, E.; Silchenko, O.; Sokoloff, D.; Horellou, C.; Beck, R.

    2016-07-01

    Context. Many galaxies contain magnetic fields supported by galactic dynamo action. The investigation of these magnetic fields can be helpful for understanding galactic evolution; however, nothing definitive is known about magnetic fields in ring galaxies. Aims: Here we investigate large-scale magnetic fields in a previously unexplored context, namely ring galaxies, and concentrate our efforts on the structures that appear most promising for galactic dynamo action, i.e. outer star-forming rings in visually unbarred galaxies. Methods: We use tested methods for modelling α-Ω galactic dynamos, taking into account the available observational information concerning ionized interstellar matter in ring galaxies. Results: Our main result is that dynamo drivers in ring galaxies are strong enough to excite large-scale magnetic fields in the ring galaxies studied. The variety of dynamo driven magnetic configurations in ring galaxies obtained in our modelling is much richer than that found in classical spiral galaxies. In particular, various long-lived transients are possible. An especially interesting case is that of NGC 4513, where the ring counter-rotates with respect to the disc. Strong shear in the region between the disc and the ring is associated with unusually strong dynamo drivers in such counter-rotators. The effect of the strong drivers is found to be unexpectedly moderate. With counter-rotation in the disc, a generic model shows that a steady mixed parity magnetic configuration that is unknown for classical spiral galaxies, may be excited, although we do not specifically model NGC 4513. Conclusions: We deduce that ring galaxies constitute a morphological class of galaxies in which identification of large-scale magnetic fields from observations of polarized radio emission, as well as dynamo modelling, may be possible. Such studies have the potential to throw additional light on the physical nature of rings, their lifetimes, and evolution.

  3. Jupiter's Ring Halo

    NASA Technical Reports Server (NTRS)

    1997-01-01

    A mosaic of four images taken through the clear filter (610 nanometers) of the solid state imaging (CCD) system aboard NASA's Galileo spacecraft on November 8, 1996, at a resolution of approximately 46 kilometers (km) per picture element (pixel) along the rings; however, because the spacecraft was only about 0.5 degrees above the ring plane, the image is highly foreshortened in the vertical direction. The images were obtained when Galileo was in Jupiter's shadow peering back toward the Sun; the ring was approximately 2,300,000 kilometers (km) away. The arc on the far right of the image is produced by sunlight scattered by small particles comprising Jupiter's upper atmospheric haze. The ring also efficiently scatters light, indicating that much of its brightness is due to particles that are microns or less in diameter. Such small particles are believed to have human-scale lifetimes, i.e., very brief compared to the solar system's age.

    Jupiter's ring system is composed of three parts -- a flat main ring, a lenticular halo interior to the main ring, and the gossamer ring, which lies exterior to the main ring. The near and far arms of Jupiter's main ring extend horizontally across the mosaic, joining together at the ring's ansa, on the far left side of the figure. The near arm of the ring appears to be abruptly truncated close to the planet, at the point where it passes into Jupiter's shadow.

    A faint mist of particles can be seen above and below the main rings; this vertically extended, toroidal 'halo' is unusual in planetary rings, and is probably caused by electromagnetic forces which can push small grains out of the ring plane. Halo material is present across this entire image, implying that it reaches more than 27,000 km above the ring plane. Because of shadowing, the halo is not visible close to Jupiter in the lower right part of the mosaic. In order to accentuate faint features in the image, different brightnesses are shown through color, with the brightest

  4. Planetary Rings

    NASA Astrophysics Data System (ADS)

    Esposito, Larry W.

    2011-07-01

    Preface; 1. Introduction: the allure of ringed planets; 2. Studies of planetary rings 1610-2004; 3. Diversity of planetary rings; 4. Individual ring particles and their collisions; 5. Large-scale ring evolution; 6. Moons confine and sculpt rings; 7. Explaining ring phenomena; 8. N-Body simulations; 9. Stochastic models; 10. Age and evolution of rings; 11. Saturn's mysterious F ring; 12. Neptune's partial rings; 13. Jupiter's ring-moon system after Galileo; 14. Ring photometry; 15. Dusty rings; 16. Cassini observations; 17. Summary: the big questions; Glossary; References; Index.

  5. Feasibilty of exterior vascular laser irradiation therapy

    NASA Astrophysics Data System (ADS)

    Chen, Rong; Xie, Shusen; Li, Hui; Li, Buhong; Chen, Yanjiao; Zhang, Xiaodong; Chen, Huifang; Xia, Xiangnan; Lin, Aizhen

    1998-08-01

    In order to study the exterior vascular laser irradiation therapy for replacing the intravascular laser irradiation therapy, we measure the distribution of radiant fluence rate in exterior vascular laser irradiation in vivo and imitative intravascular laser irradiation. The result shows that the average radiant fluence rate of exterior vascular and intravascular is 1.11 and 10.81 respectively, which is ten times between them. In order to get the radiant fluence rate corresponding to the intravascular laser irradiation, we suggest that about 20 mW HeNe laser could be used in exterior vascular laser irradiation therapy, and the laser must irradiate on the vascular perpendicularly. The suitable patient with exposed vascular must be chosen, and the diameter of the irradiated vascular is about 6 mm. Our experiment result, especially the data measured in vivo, will be useful for the research of light transport in human tissue.

  6. 7 CFR 1980.315 - Escrow accounts for exterior development.

    Code of Federal Regulations, 2011 CFR

    2011-01-01

    ... 7 Agriculture 14 2011-01-01 2011-01-01 false Escrow accounts for exterior development. 1980.315... Escrow accounts for exterior development. When proposed exterior development work cannot be completed... escrow account for exterior development only may be established by the originating lender if...

  7. 7 CFR 1980.315 - Escrow accounts for exterior development.

    Code of Federal Regulations, 2010 CFR

    2010-01-01

    ... 7 Agriculture 14 2010-01-01 2009-01-01 true Escrow accounts for exterior development. 1980.315... Escrow accounts for exterior development. When proposed exterior development work cannot be completed... escrow account for exterior development only may be established by the originating lender if...

  8. 24 CFR 3280.105 - Exit facilities; exterior doors.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

    ... 24 Housing and Urban Development 5 2013-04-01 2013-04-01 false Exit facilities; exterior doors... § 3280.105 Exit facilities; exterior doors. (a) Number and location of exterior doors. Manufactured homes shall have a minimum of two exterior doors located remote from each other. (1) Required egress...

  9. 24 CFR 3280.105 - Exit facilities; exterior doors.

    Code of Federal Regulations, 2010 CFR

    2010-04-01

    ... 24 Housing and Urban Development 5 2010-04-01 2010-04-01 false Exit facilities; exterior doors... § 3280.105 Exit facilities; exterior doors. (a) Number and location of exterior doors. Manufactured homes shall have a minimum of two exterior doors located remote from each other. (1) Required egress...

  10. 24 CFR 3280.105 - Exit facilities; exterior doors.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

    ... 24 Housing and Urban Development 5 2011-04-01 2011-04-01 false Exit facilities; exterior doors... § 3280.105 Exit facilities; exterior doors. (a) Number and location of exterior doors. Manufactured homes shall have a minimum of two exterior doors located remote from each other. (1) Required egress...

  11. Dark matter axions and caustic rings

    SciTech Connect

    Sikivie, P.

    1997-11-01

    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.

  12. Collar nut and thrust ring

    DOEpatents

    Lowery, Guy B.

    1991-01-01

    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.

  13. The Galactic Nucleus

    NASA Astrophysics Data System (ADS)

    Melia, Fulvio

    Exciting new broadband observations of the galactic nucleus have placed the heart of the Milky Way under intense scrutiny in recent years. This has been due in part to the growing interest from theorists motivated to study the physics of black hole accretion, magnetized gas dynamics, and unusual star formation. The center of our Galaxy is now known to harbor the most compelling supermassive black hole candidate, weighing in at 3-4 million solar masses. Its nearby environment is comprised of a molecular dusty ring, clusters of evolved and young stars, diffuse hot gas, ionized gas streamers, and several supernova remnants. This chapter will focus on the physical makeup of this dynamic region and the feasibility of actually imaging the black hole's shadow in the coming decade with mm interferometry.

  14. 75 FR 34170 - Plastic Omnium Automotive Exteriors, LLC, Anderson, SC; Plastic Omnium Automotive Exteriors, LLC...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-06-16

    ... Assistance on March 18, 2010, applicable to workers of Plastic Omnium Automotive Exteriors, LLC, Anderson, South Carolina. The notice was published in the Federal Register April 23, 2010 (75 FR 21356). The... Employment and Training Administration Plastic Omnium Automotive Exteriors, LLC, Anderson, SC; Plastic...

  15. Galactic Evolution

    NASA Astrophysics Data System (ADS)

    Brekke, Stewart

    2013-04-01

    All galaxies began as spiral galaxies. The early universe began with sets of two or more pre-galactic arms orbiting each other. As gravitational attraction between the arms took effect, the fore-sections of the arms tangentially collided forming spiral galaxies when they attached with the orbital motion of the arms being converted to the rotational motion of the newly formed spiral galaxies or (Iφ)arm1+ (Iφ)arm2+ ...+ (Iφ)armn= (Iφ)galaxy. If the centripetal force on the arms is more than the gravitational force on the arms, the spiral galaxy remains a spiral galaxy i.e. mv^2/r>=Gmarmmgalaxy/r^2. If the galaxy is slowly rotating, the spiral arms collapse into the body of the galaxy because the gravitational force is greater than the centripetal force on the arms and an elliptical galaxy is formed i.e. mv^2/r < Gmarmsmgalaxy/r^2.

  16. Ring Around a Galaxy

    NASA Technical Reports Server (NTRS)

    1999-01-01

    Space Telescope Science Institute astronomers are giving the public chances to decide where to aim NASA's Hubble Space Telescope. Guided by 8,000 Internet voters, Hubble has already been used to take a close-up, multi-color picture of the most popular object from a list of candidates, the extraordinary 'polar-ring' galaxy NGC 4650A. Located about 130 million light-years away, NGC 4650A is one of only 100 known polar-ring galaxies. Their unusual disk-ring structure is not yet understood fully. One possibility is that polar rings are the remnants of colossal collisions between two galaxies sometime in the distant past, probably at least 1 billion years ago. What is left of one galaxy has become the rotating inner disk of old red stars in the center. Meanwhile, another smaller galaxy which ventured too close was probably severely damaged or destroyed. The bright bluish clumps, which are especially prominent in the outer parts of the ring, are regions containing luminous young stars, examples of stellar rebirth from the remnants of an ancient galactic disaster. The polar ring appears to be highly distorted. No regular spiral pattern stands out in the main part of the ring, and the presence of young stars below the main ring on one side and above on the other shows that the ring is warped and does not lie in one plane. Determining the typical ages of the stars in the polar ring is an initial goal of our Polar Ring Science Team that can provide a clue to the evolution of this unusual galaxy. The HST exposures were acquired by the Hubble Heritage Team, consisting of Keith Noll, Howard Bond, Carol Christian, Jayanne English, Lisa Frattare, Forrest Hamilton, Anne Kinney and Zolt Levay, and guest collaborators Jay Gallagher (University of Wisconsin-Madison), Lynn Matthews (National Radio Astronomy Observatory-Charlottesville), and Linda Sparke (University of Wisconsin-Madison).

  17. Ringed Accretion Disks: Equilibrium Configurations

    NASA Astrophysics Data System (ADS)

    Pugliese, D.; Stuchlík, Z.

    2015-12-01

    We investigate a model of a ringed accretion disk, made up by several rings rotating around a supermassive Kerr black hole attractor. Each toroid of the ringed disk is governed by the general relativity hydrodynamic Boyer condition of equilibrium configurations of rotating perfect fluids. Properties of the tori can then be determined by an appropriately defined effective potential reflecting the background Kerr geometry and the centrifugal effects. The ringed disks could be created in various regimes during the evolution of matter configurations around supermassive black holes. Therefore, both corotating and counterrotating rings have to be considered as being a constituent of the ringed disk. We provide constraints on the model parameters for the existence and stability of various ringed configurations and discuss occurrence of accretion onto the Kerr black hole and possible launching of jets from the ringed disk. We demonstrate that various ringed disks can be characterized by a maximum number of rings. We present also a perturbation analysis based on evolution of the oscillating components of the ringed disk. The dynamics of the unstable phases of the ringed disk evolution seems to be promising in relation to high-energy phenomena demonstrated in active galactic nuclei.

  18. Piecewise lexsegment ideals in exterior algebras

    NASA Astrophysics Data System (ADS)

    Shakin, D. A.

    2005-02-01

    The problem of describing the Hilbert functions of homogeneous ideals of an exterior algebra over a field containing a fixed monomial ideal I is considered. For this purpose the notion of a piecewise lexsegment ideal in an exterior algebra is introduced generalizing the notion of a lexsegment ideal. It is proved that if I is a piecewise lexsegment ideal, then it is possible to describe the Hilbert functions of the homogeneous ideals containing I in a way similar to that suggested by Kruskal and Katona for the situation I=0. Moreover, a generalization of the extremal properties of lexsegment ideals is obtained (the inequality for the Betti numbers).

  19. Evaluation of commercially available exterior digital VMDs

    SciTech Connect

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

    1995-06-01

    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.

  20. EXTERIOR, A view looking south toward the northwest corner of ...

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

    EXTERIOR, A view looking south toward the northwest corner of the building including an exterior staircase that leads to the roof - Department of Energy, Mound Facility, B Building, One Mound Road, Miamisburg, Montgomery County, OH

  1. EXTERIOR, A view looking east at the west elevation of ...

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

    EXTERIOR, A view looking east at the west elevation of the building, including an exterior staircase that leads to the roof - Department of Energy, Mound Facility, Hydrolysis House Building (HH Building), One Mound Road, Miamisburg, Montgomery County, OH

  2. Planetary rings

    SciTech Connect

    Greenberg, R.; Brahic, A.

    1984-01-01

    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.

  3. Exterior view of north and east exterior walls of LongTerm ...

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

    Exterior view of north and east exterior walls of Long-Term Oxidizer Silo (T-28B), looking south. Silo was designed to assess long-term environmental impacts on storage of the Titan II's oxidizer (nitrogen tetroxide). The shorter Oxidizer Conditioning Structure (T-28D) is located behind and to the immediate left of T-28B - Air Force Plant PJKS, Systems Integration Laboratory, Long-Term Oxidizer Silo, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

  4. 7 CFR 1980.315 - Escrow accounts for exterior development.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ... Escrow accounts for exterior development. When proposed exterior development work cannot be completed... development work. (b) The contract for development work must provide for completion within 120 days. (c) The... 7 Agriculture 14 2014-01-01 2014-01-01 false Escrow accounts for exterior development....

  5. 7 CFR 1980.315 - Escrow accounts for exterior development.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ... Escrow accounts for exterior development. When proposed exterior development work cannot be completed... development work. (b) The contract for development work must provide for completion within 120 days. (c) The... 7 Agriculture 14 2013-01-01 2013-01-01 false Escrow accounts for exterior development....

  6. 7 CFR 1980.315 - Escrow accounts for exterior development.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ... Escrow accounts for exterior development. When proposed exterior development work cannot be completed... development work. (b) The contract for development work must provide for completion within 120 days. (c) The... 7 Agriculture 14 2012-01-01 2012-01-01 false Escrow accounts for exterior development....

  7. 46 CFR 154.1105 - Exterior water spray system: General.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... 46 Shipping 5 2011-10-01 2011-10-01 false Exterior water spray system: General. 154.1105 Section... Equipment Firefighting § 154.1105 Exterior water spray system: General. Each liquefied flammable gas vessel and each liquefied toxic gas vessel must have an exterior water spray system that meets §§...

  8. 24 CFR 3280.105 - Exit facilities; exterior doors.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

    ... 24 Housing and Urban Development 5 2014-04-01 2014-04-01 false Exit facilities; exterior doors... § 3280.105 Exit facilities; exterior doors. Link to an amendment published at 78 FR 73981, Dec. 9, 2013. (a) Number and location of exterior doors. Manufactured homes shall have a minimum of two...

  9. Saturn's rings

    NASA Technical Reports Server (NTRS)

    2000-01-01

    When seen from the unlit side, the rings of Saturn present a much different appearance from that familiar to telescopic observers. Relatively opaque areas like the B Ring turn black, while lightly populated zones, such as the C Ring and the Cassini Division, prove to excellent diffuse transmitters of sunlight. The A Ring, with intermediate opacity, is at an intermediate level of brightness.

  10. Excavationless Exterior Foundation Insulation Exploratory Study

    SciTech Connect

    Mosimann, Garrett; Wagner, Rachel; Schirber, Tom

    2013-02-01

    The key objective of this exploratory study was to investigate the feasibility of the development or adoption of technologies that would enable a large percentage of existing homes in cold climates to apply a combination 'excavationless' soil removal process with appropriate insulation and water management on the exterior of existing foundations at a low cost. Our approach was to explore existing excavation and material technologies and systems to discover whether potential successful combinations existed.

  11. Excavationless Exterior Foundation Insulation Field Study

    SciTech Connect

    Schirber, T.; Mosiman, G.; Ojczyk, C.

    2014-09-01

    Building science research supports installing exterior (soil side) foundation insulation as the optimal method to enhance the hygrothermal performance of new homes. With exterior foundation insulation, water management strategies are maximized while insulating the basement space and ensuring a more even temperature at the foundation wall. However, such an approach can be very costly and disruptive when applied to an existing home, requiring deep excavation around the entire house. The NorthernSTAR Building America Partnership team implemented an innovative, minimally invasive foundation insulation upgrade technique on an existing home. The approach consisted of using hydrovac excavation technology combined with liquid insulating foam. The team was able to excavate a continuous 4 inches wide by 4 feet to 5 feet deep trench around the entire house, 128 linear feet, except for one small part under the stoop that was obstructed with concrete debris. The combination pressure washer and vacuum extraction technology also enabled the elimination of large trenches and soil stockpiles normally produced by backhoe excavation. The resulting trench was filled with liquid insulating foam, which also served as a water-control layer of the assembly. The insulation was brought above grade using a liquid foam/rigid foam hybrid system and terminated at the top of the rim joist. Cost savings over the traditional excavation process ranged from 23% to 50%. The excavationless process could result in even greater savings since replacement of building structures, exterior features, utility meters, and landscaping would be minimal or non-existent in an excavationless process.

  12. Excavationless Exterior Foundation Insulation Field Study

    SciTech Connect

    Schirber, T.; Mosiman, G.; Ojczyk, C.

    2014-10-01

    Building science research supports installing exterior (soil side) foundation insulation as the optimal method to enhance the hygrothermal performance of new homes. With exterior foundation insulation, water management strategies are maximized while insulating the basement space and ensuring a more even temperature at the foundation wall. However, such an approach can be very costly and disruptive when applied to an existing home, requiring deep excavation around the entire house. The NorthernSTAR Building America Partnership team implemented an innovative, minimally invasive foundation insulation upgrade technique on an existing home. The approach consisted of using hydrovac excavation technology combined with a liquid insulating foam. The team was able to excavate a continuous 4" wide by 4' to 5' deep trench around the entire house, 128 linear feet, except for one small part under the stoop that was obstructed with concrete debris. The combination pressure washer and vacuum extraction technology also enabled the elimination of large trenches and soil stockpiles normally produced by backhoe excavation. The resulting trench was filled with liquid insulating foam, which also served as a water-control layer of the assembly. The insulation was brought above grade using a liquid foam/rigid foam hybrid system and terminated at the top of the rim joist. Cost savings over the traditional excavation process ranged from 23% to 50%. The excavationless process could result in even greater savings since replacement of building structures, exterior features, utility meters, and landscaping would be minimal or non-existent in an excavationless process.

  13. Inverse scattering for an exterior Dirichlet program

    NASA Technical Reports Server (NTRS)

    Hariharan, S. I.

    1981-01-01

    Scattering due to a metallic cylinder which is in the field of a wire carrying a periodic current is considered. The location and shape of the cylinder is obtained with a far field measurement in between the wire and the cylinder. The same analysis is applicable in acoustics in the situation that the cylinder is a soft wall body and the wire is a line source. The associated direct problem in this situation is an exterior Dirichlet problem for the Helmholtz equation in two dimensions. An improved low frequency estimate for the solution of this problem using integral equation methods is presented. The far field measurements are related to the solutions of boundary integral equations in the low frequency situation. These solutions are expressed in terms of mapping function which maps the exterior of the unknown curve onto the exterior of a unit disk. The coefficients of the Laurent expansion of the conformal transformations are related to the far field coefficients. The first far field coefficient leads to the calculation of the distance between the source and the cylinder.

  14. Saturn's Rings

    NASA Astrophysics Data System (ADS)

    Cuzzi, J. N.

    2014-12-01

    The rings are changing before our eyes; structure varies on all timescales and unexpected things have been discovered. Many questions have been answered, but some answers remain elusive (see Cuzzi et al 2010 for a review). Here we highlight the major ring science progress over the mission to date, and describe new observations planned for Cassini's final three years. Ring Composition and particle sizes: The rings are nearly all water ice with no other ices - so why are they reddish? The C Ring and Cassini Division are "dirtier" than the more massive B and A Rings, as shown by near-IR and, recently, microwave observations. Particle sizes, from stellar and radio occultations, vary from place to place. Ring structure, micro and macro: numerous spiral density waves and ubiquitous "self-gravity wakes" reveal processes which fostered planet formation in the solar system and elsewhere. However, big puzzles remain regarding the main ring divisions, the C Ring plateau structures, and the B Ring irregular structure. Moonlets, inside and out, seen and unseen: Two gaps contain sizeable moonlets, but more gaps seem to contain none; even smaller embedded "propeller" objects wander, systematically or randomly, through the A ring. Rubble pile ringmoons just outside the rings may escaped from the rings, and the recently discovered "Peggy" may be trying this as we watch. Impact bombardment of the rings: Comet fragments set the rings to rippling on century-timescales, and boulders crash through hourly; meanwhile, the constant hail of infalling Kuiper belt material has a lower mass flux than previously thought. Origin and Age of the Rings: The ring mass and bombardment play key roles. The ring mass is well known everywhere but in the B Ring (where most of it is). New models suggest how tidal breakup of evolving moons may have formed massive ancient rings, of which the current ring is just a shadow. During its last three years, the Cassini tour profile will allow entirely new

  15. Reconstruction algorithms for interior and exterior spherical Radon transform-based ultrasound imaging

    NASA Astrophysics Data System (ADS)

    Vaidyanathan, Ravi Shankar; Lewis, Matthew A.; Ambartsoumian, Gaik; Aktosun, Tuncay

    2009-02-01

    This work is concerned with the numerical implementation of a reconstruction algorithm developed to recover a function from its spherical means over spheres centered on a circle. The algorithm is experimentally verified by simulations using numerical phantoms. In the scheme of tomography, acoustic waves are generated by illuminating an object with a short burst of radio-frequency waves. In applications, like breast cancer imaging, which use modalities like photo-acoustic tomography (PAT) that model the acoustic pressures as spherical means, data are measured on the detectors located in a circle surrounding the object. This is then used to reconstruct the absorption density inside the object. In contrast, applications like bore hole tomography and improved Intravascular Ultra Sound (IVUS) imaging for prostate cancer, which use modalities like Radial Reflection Diffraction Tomography (RRDT), a ring of detectors placed exterior to the object, collect the acoustic waves as back-scattered field. This work uses a single algorithm to reconstruct functions from data collected using these two different techniques - one, by placing the object inside the ring of detectors, and the other, by placing the object exterior to the ring of detectors. The algorithm then draws a comparison between the two reconstructions. The case of bistatic ultrasound imaging, where the elliptical Radon transform is appropriate, is also discussed.

  16. Vascular ring

    MedlinePlus

    ... with aberrant subclavian and left ligamentum ateriosus; Congenital heart defect - vascular ring; Birth defect heart - vascular ring ... accounts for less than 1% of all congenital heart problems. The condition occurs as often in males ...

  17. Neptune's rings

    NASA Technical Reports Server (NTRS)

    1999-01-01

    This 591-second exposure of the rings of Neptune were taken with the clear filter by the Voyager 2 wide-angle camera. The two main rings are clearly visible and appear complete over the region imaged. Also visible in this image is the inner faint ring and the faint band which extends smoothly from the ring roughly halfway between the two bright rings. Both of these newly discovered rings are broad and much fainter than the two narrow rings. The bright glare is due to over-exposure of the crescent on Neptune. Numerous bright stars are evident in the background. Both bright rings have material throughout their entire orbit, and are therefore continuous. The Voyager Mission is conducted by JPL for NASA's Office of Space Science and Applications.

  18. Automated visual inspection of an airplane exterior

    NASA Astrophysics Data System (ADS)

    Jovančević, Igor; Orteu, Jean-José; Sentenac, Thierry; Gilblas, Rémi

    2015-04-01

    This paper deals with the inspection of an airplane using a Pan-Tilt-Zoom camera mounted on a mobile robot moving around the airplane. We present image processing methods for detection and inspection of four different types of items on the airplane exterior. Our detection approach is focused on the regular shapes such as rounded corner rectangles and ellipses, while inspection relies on clues such as uniformity of isolated image regions, convexity of segmented shapes and periodicity of the image intensity signal. The initial results are promising and demonstrate the feasibility of the envisioned robotic system.

  19. Design of an autonomous exterior security robot

    NASA Technical Reports Server (NTRS)

    Myers, Scott D.

    1994-01-01

    This paper discusses the requirements and preliminary design of robotic vehicle designed for performing autonomous exterior perimeter security patrols around warehouse areas, ammunition supply depots, and industrial parks for the U.S. Department of Defense. The preliminary design allows for the operation of up to eight vehicles in a six kilometer by six kilometer zone with autonomous navigation and obstacle avoidance. In addition to detection of crawling intruders at 100 meters, the system must perform real-time inventory checking and database comparisons using a microwave tags system.

  20. 1. GENERAL EXTERIOR VIEW LOOKING SOUTH, SHOWING FRONT FACADE OF ...

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

    1. GENERAL EXTERIOR VIEW LOOKING SOUTH, SHOWING FRONT FACADE OF ADMINISTRATION BUILDING. - Bonneville Project, Administration Building, South side of main entrance, Bonneville Project, Bonneville, Multnomah County, OR

  1. 5. GENERAL EXTERIOR VIEW LOOKING SOUTHWEST, SHOWING EAST FACADE OF ...

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

    5. GENERAL EXTERIOR VIEW LOOKING SOUTHWEST, SHOWING EAST FACADE OF ADMINISTRATION BUILDING. - Bonneville Project, Administration Building, South side of main entrance, Bonneville Project, Bonneville, Multnomah County, OR

  2. 1. GENERAL EXTERIOR VIEW LOOKING SOUTHEAST AT DOWNSTREAM FACE OF ...

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

    1. GENERAL EXTERIOR VIEW LOOKING SOUTHEAST AT DOWNSTREAM FACE OF DAM/SPILLWAY. VIEW TAKEN FROM WASHINGTON SHORELINE. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

  3. 4. GENERAL EXTERIOR VIEW LOOKING WEST, SHOWING REAR WING OF ...

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

    4. GENERAL EXTERIOR VIEW LOOKING WEST, SHOWING REAR WING OF ADMINISTRATION BUILDING. - Bonneville Project, Administration Building, South side of main entrance, Bonneville Project, Bonneville, Multnomah County, OR

  4. View of exterior circumferential path at northeast side of building ...

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

    View of exterior circumferential path at northeast side of building beneath trellis, looking southeast - National Zoological Park, Bird House, 3001 Connecticut Avenue NW, Washington, District of Columbia, DC

  5. 11. Exterior detail view of northeast corner, showing stucco finish ...

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

    11. Exterior detail view of northeast corner, showing stucco finish and woodwork details - American Railway Express Company Freight Building, 1060 Northeast Division Street, Bend, Deschutes County, OR

  6. 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

  7. 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

  8. 10. Southeast view interior, typical exterior office, room 27 ...

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

    10. Southeast view interior, typical exterior office, room 27 - Selfridge Field, Building No. 1050, Northwest corner of Doolittle Avenue & D Street; Harrison Township, Mount Clemens, Macomb County, MI

  9. 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

  10. 1. EXTERIOR, SIDE OF PICKLE BARREL RESTAURANT AND ADJOINING STORE ...

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

    1. EXTERIOR, SIDE OF PICKLE BARREL RESTAURANT AND ADJOINING STORE - Silverton Historic District, East Thirteenth & Green Streets (Commercial Building), East Thirteenh & Green Streets, Silverton, San Juan County, CO

  11. 1. EXTERIOR OF CENTRAL HEATING STATION, BUILDING 102, LOOKING NORTH. ...

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

    1. EXTERIOR OF CENTRAL HEATING STATION, BUILDING 102, LOOKING NORTH. - Mill Valley Air Force Station, Central Heating Station, East Ridgecrest Boulevard, Mount Tamalpais, Mill Valley, Marin County, CA

  12. EXTERIOR VIEW, LOOKING WEST, WITH CENTER SPAN EXTENDING ACROSS WARRIOR ...

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

    EXTERIOR VIEW, LOOKING WEST, WITH CENTER SPAN EXTENDING ACROSS WARRIOR RIVER. - Gulf, Mobile & Ohio Railroad Bridge, Spans Black Warrior River between Northport & Tuscaloosa, Tuscaloosa, Tuscaloosa County, AL

  13. EXTERIOR VIEW, LOOKING TOWARDS TUSCALOOSA, WITH CONCRETE PIERS AND CENTER ...

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

    EXTERIOR VIEW, LOOKING TOWARDS TUSCALOOSA, WITH CONCRETE PIERS AND CENTER SPAN. - Gulf, Mobile & Ohio Railroad Bridge, Spans Black Warrior River between Northport & Tuscaloosa, Tuscaloosa, Tuscaloosa County, AL

  14. EXTERIOR VIEW, LOOKING TOWARDS TUSCALOOSA, WITH APPROACH, CONCRETE PIERS AND ...

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

    EXTERIOR VIEW, LOOKING TOWARDS TUSCALOOSA, WITH APPROACH, CONCRETE PIERS AND CENTER SPAN. - Gulf, Mobile & Ohio Railroad Bridge, Spans Black Warrior River between Northport & Tuscaloosa, Tuscaloosa, Tuscaloosa County, AL

  15. 1. EXTERIOR OF ADMINISTRATION BUILDING 202, LOOKING NORTHNORTHWEST. Mill ...

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

    1. EXTERIOR OF ADMINISTRATION BUILDING 202, LOOKING NORTH-NORTHWEST. - Mill Valley Air Force Station, Administration Building, East Ridgecrest Boulevard, Mount Tamalpais, Mill Valley, Marin County, CA

  16. 2. EXTERIOR EAST ELEVATION VIEW OF ADMINISTRATION BUILDING 202, LOOKING ...

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

    2. EXTERIOR EAST ELEVATION VIEW OF ADMINISTRATION BUILDING 202, LOOKING SOUTH. - Mill Valley Air Force Station, Administration Building, East Ridgecrest Boulevard, Mount Tamalpais, Mill Valley, Marin County, CA

  17. The Bubbling Galactic Disk

    NASA Astrophysics Data System (ADS)

    Churchwell, E.; Povich, M. S.; Allen, D.; Taylor, M. G.; Meade, M. R.; Babler, B. L.; Indebetouw, R.; Watson, C.; Whitney, B. A.; Wolfire, M. G.; Bania, T. M.; Benjamin, R. A.; Clemens, D. P.; Cohen, M.; Cyganowski, C. J.; Jackson, J. M.; Kobulnicky, H. A.; Mathis, J. S.; Mercer, E. P.; Stolovy, S. R.; Uzpen, B.; Watson, D. F.; Wolff, M. J.

    2006-10-01

    A visual examination of the images from the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) has revealed 322 partial and closed rings that we propose represent partially or fully enclosed three-dimensional bubbles. We argue that the bubbles are primarily formed by hot young stars in massive star formation regions. We have found an average of about 1.5 bubbles per square degree. About 25% of the bubbles coincide with known radio H II regions, and about 13% enclose known star clusters. It appears that B4-B9 stars (too cool to produce detectable radio H II regions) probably produce about three-quarters of the bubbles in our sample, and the remainder are produced by young O-B3 stars that produce detectable radio H II regions. Some of the bubbles may be the outer edges of H II regions where PAH spectral features are excited and may not be dynamically formed by stellar winds. Only three of the bubbles are identified as known SNRs. No bubbles coincide with known planetary nebulae or W-R stars in the GLIMPSE survey area. The bubbles are small. The distribution of angular diameters peaks between 1' and 3' with over 98% having angular diameters less than 10' and 88% less than 4'. Almost 90% have shell thicknesses between 0.2 and 0.4 of their outer radii. Bubble shell thickness increases approximately linearly with shell radius. The eccentricities are rather large, peaking between 0.6 and 0.7; about 65% have eccentricities between 0.55 and 0.85.

  18. Cladding Attachment Over Thick Exterior Insulating Sheathing

    SciTech Connect

    Baker, P.; Eng, P.; Lepage, R.

    2014-01-01

    The addition of insulation to the exterior of buildings is an effective means of increasing the thermal resistance of both wood framed walls as well as mass masonry wall assemblies. For thick layers of exterior insulation (levels greater than 1.5 inches), the use of wood furring strips attached through the insulation back to the structure has been used by many contractors and designers as a means to provide a convenient cladding attachment location (Straube and Smegal 2009, Pettit 2009, Joyce 2009, Ueno 2010). The research presented in this report is intended to help develop a better understanding of the system mechanics involved and the potential for environmental exposure induced movement between the furring strip and the framing. BSC sought to address the following research questions: 1. What are the relative roles of the mechanisms and the magnitudes of the force that influence the vertical displacement resistance of the system? 2. Can the capacity at a specified deflection be reliably calculated using mechanics based equations? 3. What are the impacts of environmental exposure on the vertical displacement of furring strips attached directly through insulation back to a wood structure?

  19. Cladding Attachment Over Thick Exterior Insulating Sheathing

    SciTech Connect

    Baker, P.; Eng, P.; Lepage, R.

    2014-01-01

    The addition of insulation to the exterior of buildings is an effective means of increasing the thermal resistance of both wood framed walls as well as mass masonry wall assemblies. For thick layers of exterior insulation (levels greater than 1.5 inches), the use of wood furring strips attached through the insulation back to the structure has been used by many contractors and designers as a means to provide a convenient cladding attachment location (Straube and Smegal 2009, Pettit 2009, Joyce 2009, Ueno 2010). The research presented in this report is intended to help develop a better understanding of the system mechanics involved and the potential for environmental exposure induced movement between the furring strip and the framing. BSC sought to address the following research questions: 1.What are the relative roles of the mechanisms and the magnitudes of the force that influence the vertical displacement resistance of the system? 2.Can the capacity at a specified deflection be reliably calculated using mechanics based equations? 3.What are the impacts of environmental exposure on the vertical displacement of furring strips attached directly through insulation back to a wood structure?

  20. Active galactic nuclei

    PubMed Central

    Fabian, Andrew C.

    1999-01-01

    Active galactic nuclei are the most powerful, long-lived objects in the Universe. Recent data confirm the theoretical idea that the power source is accretion into a massive black hole. The common occurrence of obscuration and outflows probably means that the contribution of active galactic nuclei to the power density of the Universe has been generally underestimated. PMID:10220363

  1. 46 CFR 154.1105 - Exterior water spray system: General.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 46 Shipping 5 2014-10-01 2014-10-01 false Exterior water spray system: General. 154.1105 Section 154.1105 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) CERTAIN BULK DANGEROUS... Equipment Firefighting § 154.1105 Exterior water spray system: General. Each liquefied flammable gas...

  2. 46 CFR 154.1105 - Exterior water spray system: General.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... 46 Shipping 5 2013-10-01 2013-10-01 false Exterior water spray system: General. 154.1105 Section 154.1105 Shipping COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) CERTAIN BULK DANGEROUS... Equipment Firefighting § 154.1105 Exterior water spray system: General. Each liquefied flammable gas...

  3. 17. DETAIL OF INTERIOR AND EXTERIOR WALL CONSTRUCTION, VIEW TOWARD ...

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

    17. DETAIL OF INTERIOR AND EXTERIOR WALL CONSTRUCTION, VIEW TOWARD NORTHEAST CORNER, THIRD BAY Showing insulated exterior wall at right; asphalt felt on interior separation wall at left; sill beam, stud, and concrete foundation detailing of interior wall. - U.S. Military Academy, Ice House, Mills Road at Howze Place, West Point, Orange County, NY

  4. 18. DETAIL OF EXTERIOR WALL CONSTRUCTION, VIEW TOWARD EAST, THIRD ...

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

    18. DETAIL OF EXTERIOR WALL CONSTRUCTION, VIEW TOWARD EAST, THIRD BAY Showing furring strips, kraft faced cellulose fiber insulation, and asphalt felt applied to interior of exterior wall studs. - U.S. Military Academy, Ice House, Mills Road at Howze Place, West Point, Orange County, NY

  5. 5. EXTERIOR OF WEST (REAR) SIDE OF BUILDING 103 SHOWING ...

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

    5. EXTERIOR OF WEST (REAR) SIDE OF BUILDING 103 SHOWING TALL RUSTIC STYLE CHIMNEY WITH GABLE FRAME, AND CONCRETE STEPS TO SIDE ENTRY DOOR AT PHOTO RIGHT. CHANGE IN EXTERIOR WALL DELINEATING 1946 BEDROOM ADDITION AND REMODELED WINDOW TO BATHROOM ARE VISIBLE AT PHOTO LEFT. VIEW TO NORTHEAST. - Rush Creek Hydroelectric System, Worker Cottage, Rush Creek, June Lake, Mono County, CA

  6. Exterior differentiation in the Regge calculus

    SciTech Connect

    Brewin, L.

    1986-01-01

    Regge manifolds are piecewise continuous manifolds constructed from a finite number of basic building blocks. On such manifolds piecewise continuous forms can be defined in a way similar to differential forms on a differentiable manifold. Regge manifolds are used extensively in the construction of space-times in numerical general relativity. In this paper a definition of exterior differentiation suitable for use on piecewise continuous forms on a Regge manifold is presented. It is shown that this definition leads to a version of Stokes' theorem and also to the usual result that d/sup 2/ = 0. This is preceded by a discussion of certain geometrical properties of the Regge manifolds. It is shown that the version of Stokes' theorem presented here coincides with the usual definition when the Regge manifold is refined, by increasing the number of cells while keeping the total volume constant, to a smooth manifold.

  7. Visualizing interior and exterior jet aircraft noise

    NASA Astrophysics Data System (ADS)

    Moondra, Manmohan S.

    In today's competitive aerospace industry, the quest for quiet has drawn significant attention to both the interior and exterior design of an airplane. Understanding the noise generation mechanisms of a jet aircraft is a crucial first step toward developing the most cost-effective noise and vibrations abatement methods. In this investigation, the Helmholtz Equation Least Squares (HELS) based nearfield acoustic holography will be used to understand noise transmission caused by jet engine and turbulence into the fuselage of a jet aircraft cruising at 30,000 ft. Modern propulsive jet engines produce exterior noise sources with a high amplitude noise field and complicated characteristics, which makes them very difficult to characterize. In particular, there are turbulent eddies that are moving through the jet at high speeds along the jet boundary. These turbulent eddies in the shear layer produce a directional and frequency dependent noise. The original HELS approach assumes a spherical source at the origin and computes the acoustic field based on spherical emission from this source. This assumption of one source at the origin is not sufficient to characterize a complex source like a jet. As such, a modified HELS approach is introduced that will help improve the source characterization as it is not dependent on a single source at the origin but a number of virtual sources throughout the space. Custom microphones are created to take acoustic pressure measurements around the jet engine. These measured acoustic pressures are then taken as input to the modified HELS algorithm to visualize the noise pattern of a subsonic jet engine.

  8. Planetary Rings

    NASA Technical Reports Server (NTRS)

    Cuzzi, Jeffrey N.

    1994-01-01

    Just over two decades ago, Jim Pollack made a critical contribution to our understanding of planetary ring particle properties, and resolved a major apparent paradox between radar reflection and radio emission observations. At the time, particle properties were about all there were to study about planetary rings, and the fundamental questions were, why is Saturn the only planet with rings, how big are the particles, and what are they made of? Since then, we have received an avalanche of observations of planetary ring systems, both from spacecraft and from Earth. Meanwhile, we have seen steady progress in our understanding of the myriad ways in which gravity, fluid and statistical mechanics, and electromagnetism can combine to shape the distribution of the submicron-to-several-meter size particles which comprise ring systems into the complex webs of structure that we now know them to display. Insights gained from studies of these giant dynamical analogs have carried over into improved understanding of the formation of the planets themselves from particle disks, a subject very close to Jim's heart. The now-complete reconnaissance of the gas giant planets by spacecraft has revealed that ring systems are invariably found in association with families of regular satellites, and there is ark emerging perspective that they are not only physically but causally linked. There is also mounting evidence that many features or aspects of all planetary ring systems, if not the ring systems themselves, are considerably younger than the solar system

  9. Fermi Galactic Center Zoom

    NASA Video Gallery

    This animation zooms into an image of the Milky Way, shown in visible light, and superimposes a gamma-ray map of the galactic center from NASA's Fermi. Raw data transitions to a view with all known...

  10. Galactic cosmic ray composition

    NASA Technical Reports Server (NTRS)

    Meyer, J. P.

    1986-01-01

    An assessment is given of the galactic cosmic ray source (GCRS) elemental composition and its correlation with first ionization potential. The isotopic composition of heavy nuclei; spallation cross sections; energy spectra of primary nuclei; electrons; positrons; local galactic reference abundances; comparison of solar energetic particles and solar coronal compositions; the hydrogen; lead; nitrogen; helium; and germanium deficiency problems; and the excess of elements are among the topics covered.

  11. Autonomous navigation for structured exterior environments

    SciTech Connect

    Pletta, J B

    1993-12-01

    The Telemanaged Mobile Security Station (TMSS) was developed at Sandia National Laboratories to investigate the role of mobile robotics in exterior perimeter security systems. A major feature of the system is its capability to perform autonomous patrols of the security site`s network of roads. Perimeter security sites are well known, structured environments; the locations of the roads, buildings, and fences are relatively static. A security robot has the advantage of being able to learn its new environment prior to autonomous travel. The TMSS robot combines information from a microwave beacon system and on-board dead reckoning sensors to determine its location within the site. The operator is required to teleoperate the robot in a teach mode over all desired paths before autonomous operations can commence. During this teach phase, TMSS stores points from its position location system at two meter intervals. This map data base is used for planning paths and for reference during path following. Details of the position location and path following systems will be described along with system performance and recommendations for future enhancements.

  12. Interaction of the Local Interstellar Medium with the Heliosphere: Role of the Interior and Exterior Magnetic Fields

    NASA Technical Reports Server (NTRS)

    Barnes, Aaron; DeVincenzi, Donald (Technical Monitor)

    2000-01-01

    A complete model of the global interaction between the solar wind and the local interstellar medium must take account of interstellar neutral atoms, interstellar ionized gas, solar and galactic magnetic fields, galactic and anomalous cosmic rays. For now, however, in view of the many uncertainties about conditions in the interstellar medium, etc., all models must be regarded as highly idealized and incomplete. In the present review I concentrate on the role of magnetic fields of solar and interstellar origin. The former, the interior field, has negligible influence on the unshocked solar wind; the immediate post-shock solar wind is probably low-beta, so that the interior magnetic field is still unimportant, but this situation changes as the plasma flows through the heliosheath, and a ridge of strong magnetic field may form to separate materials of polar and equatorial origin. The exterior (interstellar) field is likely to play an important role in determining the global morphology of the system outside the termination shock. If the exterior field is strong enough, it can compress the heliosphere (although exterior neutral and/or ionized hydrogen may play the dominant role). Even if the interstellar magnetic field does not provide the dominant pressure, its orientation can substantially affect the configuration of the heliosphere, especially the location and orientation of the heliospheric discontinuities. The configurations can be quite different for the situations in which the field and flow are (a) aligned or (b) transverse. Obliquity of the field produces asymmetry in the geometry of the system; in particular the noses of heliopause and interstellar bow shock are shifted away from the interstellar flow direction, and in opposite directions, due to the asymmetric draping of the magnetic field.

  13. Vascular rings.

    PubMed

    Backer, Carl L; Mongé, Michael C; Popescu, Andrada R; Eltayeb, Osama M; Rastatter, Jeffrey C; Rigsby, Cynthia K

    2016-06-01

    The term vascular ring refers to congenital vascular anomalies of the aortic arch system that compress the esophagus and trachea, causing symptoms related to those two structures. The most common vascular rings are double aortic arch and right aortic arch with left ligamentum. Pulmonary artery sling is rare and these patients need to be carefully evaluated for frequently associated tracheal stenosis. Another cause of tracheal compression occurring only in infants is the innominate artery compression syndrome. In the current era, the diagnosis of a vascular ring is best established by CT imaging that can accurately delineate the anatomy of the vascular ring and associated tracheal pathology. For patients with a right aortic arch there recently has been an increased recognition of a structure called a Kommerell diverticulum which may require resection and transfer of the left subclavian artery to the left carotid artery. A very rare vascular ring is the circumflex aorta that is now treated with the aortic uncrossing operation. Patients with vascular rings should all have an echocardiogram because of the incidence of associated congenital heart disease. We also recommend bronchoscopy to assess for additional tracheal pathology and provide an assessment of the degree of tracheomalacia and bronchomalacia. The outcomes of surgical intervention are excellent and most patients have complete resolution of symptoms over a period of time. PMID:27301603

  14. EXTERIOR VIEW OF FORTYTHIRD STREET STREETSCAPE WITH BUNGALOWS, SIDEWALKS AND ...

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

    EXTERIOR VIEW OF FORTY-THIRD STREET STREETSCAPE WITH BUNGALOWS, SIDEWALKS AND STREET TREES ORIGINAL TO THE JEMISON AND COMPANY DEVELOPMENT OF THE 'MODEL' INDUSTRIAL TOWN. - City of Fairfield, Fairfield, Jefferson County, AL

  15. 6. Neg. No. F52, Apr 13, 1930, EXTERIOR EAST ...

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

    6. Neg. No. F-52, Apr 13, 1930, EXTERIOR - EAST SIDE OF WAREHOUSE AND LOADING DOCK, SHOWING CRANE, LOOKING NORTH - Ford Motor Company Long Beach Assembly Plant, Crane, 700 Henry Ford Avenue, Long Beach, Los Angeles County, CA

  16. 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

  17. 10. Exterior view of NE corner showing crenellated parapet. ...

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

    10. Exterior view of NE corner showing crenellated parapet. - Central of Georgia Railway, Savannah Repair Shops & Terminal Facilities, Engine Boiler & Pattern Building, Bounded by West Broad, Jones, West Boundary & Hull Streets, Savannah, Chatham County, GA

  18. 1. EXTERIOR VIEW TO THE NORTHEAST OF A BROCK HOUSE ...

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

    1. EXTERIOR VIEW TO THE NORTHEAST OF A BROCK HOUSE USED FOR THE WATER FILTERING SYSTEM. - Nevada Test Site, Pluto Facility, Water Filtering System Brock House, Area 26, Wahmonie Flats, Cane Spring Road, Mercury, Nye County, NV

  19. 2. EXTERIOR VIEW TO THE NORTH OF WATER FILTERING EQUIPMENT ...

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

    2. EXTERIOR VIEW TO THE NORTH OF WATER FILTERING EQUIPMENT AND BROCK HOUSES ALONG THE EAST SIDE OF THE COMPOUND. - Nevada Test Site, Pluto Facility, Area 26, Wahmonie Flats, Cane Spring Road, Mercury, Nye County, NV

  20. 4. EXTERIOR VIEW TO THE NORTH OF THE WATER TOWER ...

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

    4. EXTERIOR VIEW TO THE NORTH OF THE WATER TOWER AND MISCELLANEOUS EQUIPMENT ALONG THE EAST SIDE OF THE COMPOUND. - Nevada Test Site, Pluto Facility, Area 26, Wahmonie Flats, Cane Spring Road, Mercury, Nye County, NV

  1. 3. EXTERIOR VIEW TO THE NORTHEAST OF A RAILROAD CAR ...

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

    3. EXTERIOR VIEW TO THE NORTHEAST OF A RAILROAD CAR ON THE TRACKS AND THE PARTS OF AN ENGINE STAND. - Nevada Test Site, Pluto Facility, Area 26, Wahmonie Flats, Cane Spring Road, Mercury, Nye County, NV

  2. 17. GENERAL EXTERIOR VIEW LOOKING NORTHEAST, SHOWING FISH LADDER ON ...

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

    17. GENERAL EXTERIOR VIEW LOOKING NORTHEAST, SHOWING FISH LADDER ON BRADFORD ISLAND; VIEW IS TAKEN FROM ROOF OF POWERHOUSE #1; THE DAM/SPILLWAY IS IN RIGHT BACKGROUND. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

  3. 25. GENERAL EXTERIOR VIEW LOOKING WEST, SHOWING FISH LADDER DOWNSTREAM ...

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

    25. GENERAL EXTERIOR VIEW LOOKING WEST, SHOWING FISH LADDER DOWNSTREAM FROM THE DAM/SPILLWAY ON THE WASHINGTON SHORE. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

  4. 2. GENERAL EXTERIOR VIEW LOOKING SOUTH, SHOWING DOWNSTREAM FACE OF ...

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

    2. GENERAL EXTERIOR VIEW LOOKING SOUTH, SHOWING DOWNSTREAM FACE OF DAM/SPILLWAY; PARKING LOT/WORK AREA ON WASHINGTON SHORE IS VISIBLE IN FOREGROUND. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

  5. 6. GENERAL EXTERIOR VIEW LOOKING SOUTHWEST, SHOWING UPSTREAM FACE OF ...

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

    6. GENERAL EXTERIOR VIEW LOOKING SOUTHWEST, SHOWING UPSTREAM FACE OF DAM/SPILLWAY; FOLIAGE IN FOREGROUND IS ON WASHINGTON SHORELINE. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

  6. 3. GENERAL EXTERIOR VIEW LOOKING NORTH, SHOWING REAR FACADE OF ...

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

    3. GENERAL EXTERIOR VIEW LOOKING NORTH, SHOWING REAR FACADE OF ADMINISTRATION BUILDING'S WEST WING. - Bonneville Project, Administration Building, South side of main entrance, Bonneville Project, Bonneville, Multnomah County, OR

  7. 8. GENERAL EXTERIOR VIEW LOOKING SOUTH, SHOWING UPSTREAM FACE OF ...

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

    8. GENERAL EXTERIOR VIEW LOOKING SOUTH, SHOWING UPSTREAM FACE OF DAM/SPILLWAY; THE VIEW HIGHLIGHTS THE UPSTREAM APPEARANCE OF THE PIERS SUPPORTING THE MOVABLE STONEY GATES. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

  8. 10. GENERAL EXTERIOR VIEW LOOKING SOUTH, SHOWING UPSTREAM FACE OF ...

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

    10. GENERAL EXTERIOR VIEW LOOKING SOUTH, SHOWING UPSTREAM FACE OF DAM/SPILLWAY; ELECTRICALLY-OPERATED GATE MECHANISMS ARE ON RIGHT; GANTRY CRANES ARE VISIBLE IN CENTER/LEFT. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

  9. 13. DETAIL EXTERIOR VIEW LOOKING NORTHEAST, SHOWING CONTROL TOWER AT ...

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

    13. DETAIL EXTERIOR VIEW LOOKING NORTHEAST, SHOWING CONTROL TOWER AT UPSTREAM FACE OF DAM/SPILLWAY ON BRADFORD ISLAND. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

  10. 1. GENERAL EXTERIOR VIEW LOOKING NORTHEAST, SHOWING FRONT FACADE OF ...

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

    1. GENERAL EXTERIOR VIEW LOOKING NORTHEAST, SHOWING FRONT FACADE OF AUDITORIUM; ENTRANCE ROAD TO BONNEVILLE PROJECT IS IN FOREGROUND; FLAGPOLE IS IN CENTER. - Bonneville Project, Auditorium, Columbia River, 1 mile Northeast of Exit 40, Interstate 84, Bonneville, Multnomah County, OR

  11. 2. GENERAL EXTERIOR VIEW LOOKING NORTHEAST, SHOWING LANDSCAPING AROUND ENTRANCE ...

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

    2. GENERAL EXTERIOR VIEW LOOKING NORTHEAST, SHOWING LANDSCAPING AROUND ENTRANCE ROAD TO BONNEVILLE PROJECT; THE AUDITORIUM IS PARTIALLY VISIBLE IN CENTER BACKGROUND. - Bonneville Project, Columbia River, 1 mile Northeast of Exit 40, off Interstate 84, Bonneville, Multnomah County, OR

  12. 2. GENERAL EXTERIOR VIEW LOOKING EAST, SHOWING FRONT AND WEST ...

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

    2. GENERAL EXTERIOR VIEW LOOKING EAST, SHOWING FRONT AND WEST FACADE OF ADMINISTRATION BUILDING. - Bonneville Project, Administration Building, South side of main entrance, Bonneville Project, Bonneville, Multnomah County, OR

  13. 12. DETAIL EXTERIOR VIEW LOOKING SOUTHWEST, SHOWING CONTROL TOWER AT ...

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

    12. DETAIL EXTERIOR VIEW LOOKING SOUTHWEST, SHOWING CONTROL TOWER AT SOUTH END OF DAM/SPILLWAY; ENTRANCE TO BRADFORD ISLAND FISH LADDER IS VISIBLE IN FOREGROUND. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

  14. 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

  15. 4. GENERAL EXTERIOR VIEW LOOKING SOUTHWEST, SHOWING ENTRANCE ROAD TO ...

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

    4. GENERAL EXTERIOR VIEW LOOKING SOUTHWEST, SHOWING ENTRANCE ROAD TO BONNEVILLE PROJECT. - Bonneville Project, Columbia River, 1 mile Northeast of Exit 40, off Interstate 84, Bonneville, Multnomah County, OR

  16. 4. DETAIL EXTERIOR VIEW LOOKING NORTHEAST, SHOWING PIERS AND MOVABLE ...

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

    4. DETAIL EXTERIOR VIEW LOOKING NORTHEAST, SHOWING PIERS AND MOVABLE STONEY GATES ON DOWNSTREAM FACE OF DAM/SPILLWAY. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

  17. 7. EXTERIOR, SIDE VIEW FROM GARDEN SHOWING GRAPE ARBOR undated ...

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

    7. EXTERIOR, SIDE VIEW FROM GARDEN SHOWING GRAPE ARBOR undated - Jean Baptiste Valle House, 99 South Main Street (Northwest corner of Main & Market Streets), Sainte Genevieve, Ste. Genevieve County, MO

  18. Exterior oblique view of southeast and northeast side. View facing ...

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

    Exterior oblique view of southeast and northeast side. View facing west-southwest - U.S. Naval Base, Pearl Harbor, Forge Shop & Galvanizing Shop, Sixth Street between Avenues D & E, Pearl City, Honolulu County, HI

  19. 32. Credit JTL. Exterior transformer bank; note lightning arrestors removed ...

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

    32. Credit JTL. Exterior transformer bank; note lightning arrestors removed from pad and smaller arrestors installed on transformers and in area near air switches. - Dam No. 4 Hydroelectric Plant, Potomac River, Martinsburg, Berkeley County, WV

  20. 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

  1. 1. EXTERIOR VIEW SHOWING THE SOUTHWEST & SOUTHEAST SIDES OF ...

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

    1. EXTERIOR VIEW SHOWING THE SOUTHWEST & SOUTHEAST SIDES OF THE AUDITORIUM, LOOKING NORTHEAST - Fort McCoy, Building No. T-1056, Southwest of intersection of South Tenth Avenue & South "X" Street, Block 10, Sparta, Monroe County, WI

  2. 2. EXTERIOR OBLIQUE VIEW OF BUILDING 218 WITH DOMES TO ...

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

    2. EXTERIOR OBLIQUE VIEW OF BUILDING 218 WITH DOMES TO THE RIGHT, LOOKING NORTHWEST. - Mill Valley Air Force Station, Consolidated Open Mess, East Ridgecrest Boulevard, Mount Tamalpais, Mill Valley, Marin County, CA

  3. EXTERIOR ELEVATION, LOOKING SOUTH, ALSO SHOWING THE NORFOLK SOUTHERN STEAM ...

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

    EXTERIOR ELEVATION, LOOKING SOUTH, ALSO SHOWING THE NORFOLK SOUTHERN STEAM RESTORATION FLOOR INTERIOR WITH A DRILL PRESS (LEFT) AND BORING MILL (RIGHT). - Norfolk & Southern Steam Locomotive No. 1218, Norris Yards, East of Ruffner Road, Irondale, Jefferson County, AL

  4. 6. EXTERIOR ELEVATION OF SOUTH END OF EAST FACADE OF ...

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

    6. EXTERIOR ELEVATION OF SOUTH END OF EAST FACADE OF STEAM PLANT, BUILDING 740, LOOKING WEST. - Oakland Naval Supply Center, Steam Plant, Sixth Street south of East K Street, Oakland, Alameda County, CA

  5. 5. EXTERIOR ELEVATION OF NORTH END OF EAST FACADE OF ...

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

    5. EXTERIOR ELEVATION OF NORTH END OF EAST FACADE OF STEAM PLANT, BUILDING 740, LOOKING WEST. - Oakland Naval Supply Center, Steam Plant, Sixth Street south of East K Street, Oakland, Alameda County, CA

  6. 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

  7. 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

  8. 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

  9. 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

  10. 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

  11. 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

  12. INTERIOR VIEW OF HALL. SHOWING THE THREELIGHT EXTERIOR DOOR TO ...

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

    INTERIOR VIEW OF HALL. SHOWING THE THREE-LIGHT EXTERIOR DOOR TO THE COVERED PATIO AREA AND THE TELEPHONE NICHE. VIEW FACING SOUTHWEST. - Hickam Field, Officers' Housing Type G, 205 Seventh Street, Honolulu, Honolulu County, HI

  13. 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

  14. 46. Exterior view at the corner of Seventh Avenue and ...

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

    46. Exterior view at the corner of Seventh Avenue and Olive Way, looking NE. Opening night film, 'The Broadway Melody,' displayed on the canopy marquee. - Fox Theater, Seventh Avenue & Olive Way, Seattle, King County, WA

  15. 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

  16. 21. Southeast corner of switch house addition, including exterior transformers ...

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

    21. Southeast corner of switch house addition, including exterior transformers and start of power transmission line. Employee House No. 1 is in the background. - Rock Creek Hydroelectric Project, Rock Creek, Baker County, OR

  17. 1. EXTERIOR VIEW TO THE NORTHWEST OF ANCILLARY STRUCTURES ASSOCIATED ...

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

    1. EXTERIOR VIEW TO THE NORTHWEST OF ANCILLARY STRUCTURES ASSOCIATED WITH AND SURROUNDING BUILDING 3210. - Nevada Test Site, Test Cell C Facility, Elevated Water Tower, Area 25, Jackass Flats, Road J, Mercury, Nye County, NV

  18. 8. Interior view of administrator's office, showing exterior windows; near ...

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

    8. Interior view of administrator's office, showing exterior windows; near northwest corner of west wing; view to south. - Ellsworth Air Force Base, Administration Office, 2704 George Drive, Blackhawk, Meade County, SD

  19. 2. REAR VIEW SHOWING SPLIT SHAKE EXTERIOR AND HEXAHEDRAL PLAN ...

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

    2. REAR VIEW SHOWING SPLIT SHAKE EXTERIOR AND HEXAHEDRAL PLAN AND DENSE LANDSCAPE - Camp Cleawox, Adirondack Sleeping Shelter, Oregon Dunes National Recreation Area, Siuslaw National Forest, Florence, Lane County, OR

  20. 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

  1. 3. Readiness Crew Building exterior, south and east sides, overall ...

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

    3. Readiness Crew Building exterior, south and east sides, overall view, looking northwest. Thalheimer - Whiteman Air Force Base, Bomber Alert Facility S-6, 1300 Alert Road, Knob Noster, Johnson County, MO

  2. 4. Readiness Crew Building exterior, three tunnels on the south ...

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

    4. Readiness Crew Building exterior, three tunnels on the south side, looking west-northwest. Thalheimer - Whiteman Air Force Base, Bomber Alert Facility S-6, 1300 Alert Road, Knob Noster, Johnson County, MO

  3. 4. EXTERIOR CONTEXT OF BUILDING 220 WITH FOUNDATION OF 224 ...

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

    4. EXTERIOR CONTEXT OF BUILDING 220 WITH FOUNDATION OF 224 IN THE FOREGROUND, LOOKING NORTH. - Mill Valley Air Force Station, Mess Hall, East Ridgecrest Boulevard, Mount Tamalpais, Mill Valley, Marin County, CA

  4. 1. EXTERIOR VIEW, LOOKING EAST, WITH ENTRANCES AND SIDE ELEVATIONS ...

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

    1. EXTERIOR VIEW, LOOKING EAST, WITH ENTRANCES AND SIDE ELEVATIONS ALONG THE OLD BANKHEAD HIGHWAY (NOW 20TH STREET) AND ELLIOTT BOULEVARD - G. W. Posey Store, Twentieth Street & Elliot Boulevard, Jasper, Walker County, AL

  5. 29. EXTERIOR CAN CONVEYOR One of three external can ...

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

    29. EXTERIOR - CAN CONVEYOR One of three external can conveyor systems which criss-crossed the multi-leveled confusion of roof structures of the cannery complex. - Hovden Cannery, 886 Cannery Row, Monterey, Monterey County, CA

  6. 1. EXTERIOR OF ENGINE ROOM, CONTAINING UNITEDTOD TWINTANDEM ENGINE, FOR ...

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

    1. EXTERIOR OF ENGINE ROOM, CONTAINING UNITED-TOD TWIN-TANDEM ENGINE, FOR 40" BLOOMING MILL - Republic Iron & Steel Company, Youngstown Works, Blooming Mill & Blooming Mill Engines, North of Poland Avenue, Youngstown, Mahoning County, OH

  7. 2. EXTERIOR OF ENGINE ROOM, CONTAINING MESTACORLISS CROSSCOMPOUND ENGINE, FOR ...

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

    2. EXTERIOR OF ENGINE ROOM, CONTAINING MESTA-CORLISS CROSS-COMPOUND ENGINE, FOR 40" BLOOMING MILL - Republic Iron & Steel Company, Youngstown Works, Blooming Mill & Blooming Mill Engines, North of Poland Avenue, Youngstown, Mahoning County, OH

  8. 5. EAGLE CREEK RECREATION AREA, EXTERIOR VIEW OF PORTION OF ...

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

    5. EAGLE CREEK RECREATION AREA, EXTERIOR VIEW OF PORTION OF EAGLE CREEK OVERLOOK. - Historic Columbia River Highway, Eagle Creek Recreation Area, Historic Columbia River Highway at Eagle Creek, Troutdale, Multnomah County, OR

  9. Electrical cable connector-clamp has smooth exterior surface

    NASA Technical Reports Server (NTRS)

    1965-01-01

    Electrical cable connector-clamp fitted with a collet has a smooth exterior surface that can be easily gripped. The collet clamps a portion of the cable and provides for connecting it to a standard electrical connector.

  10. 19. INTERIOR, VIEW THROUGH TRIANGULARARCHED DOORWAY TO EXTERIOR Moravian ...

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

    19. INTERIOR, VIEW THROUGH TRIANGULAR-ARCHED DOORWAY TO EXTERIOR - Moravian Pottery & Tile Works, Southwest side of State Route 313 (Swamp Road), Northwest of East Court Street, Doylestown, Bucks County, PA

  11. 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

  12. 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

  13. EXTERIOR, A view looking west between the south side of ...

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

    EXTERIOR, A view looking west between the south side of the building and a stack which is located in the courtyard - Department of Energy, Mound Facility, B Building, One Mound Road, Miamisburg, Montgomery County, OH

  14. EXTERIOR, A view looking northeast toward the south side of ...

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

    EXTERIOR, A view looking northeast toward the south side of the building including the diesel fuel tank and bottom portion of a stack - Department of Energy, Mound Facility, B Building, One Mound Road, Miamisburg, Montgomery County, OH

  15. EXTERIOR, A view looking east that captures the southwest corner ...

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

    EXTERIOR, A view looking east that captures the southwest corner of the building with surveyor's rod to indicate scale - Department of Energy, Mound Facility, B Building, One Mound Road, Miamisburg, Montgomery County, OH

  16. EXTERIOR, A view from above looking southwest toward the roof ...

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

    EXTERIOR, A view from above looking southwest toward the roof and stacks of B Building with I Building in the background - Department of Energy, Mound Facility, B Building, One Mound Road, Miamisburg, Montgomery County, OH

  17. 1. EXTERIOR VIEW LOOKING NORTHWEST AT BATCH FURNACE BUILDING, 22' ...

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

    1. EXTERIOR VIEW LOOKING NORTHWEST AT BATCH FURNACE BUILDING, 22' BAR MILL BUILDING, AND 22 BAR MILL MOTOR ROOM. - U.S. Steel Duquesne Works, 22-Inch Bar Mill, Along Monongahela River, Duquesne, Allegheny County, PA

  18. 1. EXTERIOR VIEW, FRONT (EAST) FACADE WITH FIVE POINTS FOUNTAIN ...

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

    1. EXTERIOR VIEW, FRONT (EAST) FACADE WITH FIVE POINTS FOUNTAIN (CENTER), DULION APARTMENTS AND ELEVENTH AVENUE SOUTH (RIGHT). VIEW TAKEN JUST AFTER BIRMINGHAM BLIZZARD OF 1993. - Highlands United Methodist Church, 1045 Twentieth Street South, Birmingham, Jefferson County, AL

  19. 13. CO'S STATEROOM (CABIN'S QUARTERS), PORT EXTERIOR. NOTE PORTHOLE AND ...

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

    13. CO'S STATEROOM (CABIN'S QUARTERS), PORT EXTERIOR. NOTE PORTHOLE AND WOODEN FRAME WINDOWS. - U.S. Coast Guard Cutter WHITE LUPINE, U.S. Coast Guard Station Rockland, east end of Tillson Avenue, Rockland, Knox County, ME

  20. Exterior view to the southeast of the west camera bunker ...

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

    Exterior view to the southeast of the west camera bunker outside the fenced facility area - Nevada Test Site, Test Cell C Facility, West Camera Bunker, Area 25, Jackass Flats, Road J, Mercury, Nye County, NV

  1. 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

  2. 10. Historic exterior view of Building 100. August 22, 1957. ...

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

    10. Historic exterior view of Building 100. August 22, 1957. On file at NASA Plumbrook Research Center, Sandusky, Ohio. NASA photo number C-45766. - Rocket Engine Testing Facility, GRC Building No. 100, NASA Glenn Research Center, Cleveland, Cuyahoga County, OH

  3. 16. GENERAL EXTERIOR VIEW LOOKING NORTHWEST, SHOWING TRANSMISSION TOWERS ON ...

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

    16. GENERAL EXTERIOR VIEW LOOKING NORTHWEST, SHOWING TRANSMISSION TOWERS ON WEST END OF BRADFORD ISLAND; BRADFORD SLOUGH DOWNSTREAM FROM POWERHOUSE #1 IS IN FOREGROUND. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

  4. 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

  5. 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

  6. 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

  7. 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

  8. 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

  9. 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

  10. Transverse electromagnetic horn antenna with resistively-loaded exterior surfaces

    DOEpatents

    Aurand, John F.

    1999-01-01

    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.

  11. 1. EXTERIOR, NORTH & WEST ELEVATIONS, LOOKING SOUTHEAST (Hans Muesig ...

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

    1. EXTERIOR, NORTH & WEST ELEVATIONS, LOOKING SOUTHEAST (Hans Muesig & Robert Ryan, Photographers, March 1979) - Methodist Episcopal Church of Montour, East side of South Walnut Street, Montour, Gem County, ID

  12. EXTERIOR VIEW, LOOKING EAST, FRONT FACADE AND ENTRANCE TO COMPANY ...

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

    EXTERIOR VIEW, LOOKING EAST, FRONT FACADE AND ENTRANCE TO COMPANY SCHOOL FOR CHILDREN OF BLACK TCI-US STEEL RED ORE MINE WORKERS - Company School for Blacks, 413 Morgan Road, Bessemer, Jefferson County, AL

  13. 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

  14. 52. DETAIL VIEW OF FRONT DOOR (EXTERIOR), FLUTED BUTTRESSES, AND ...

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

    52. DETAIL VIEW OF FRONT DOOR (EXTERIOR), FLUTED BUTTRESSES, AND PARAPETED GABLE, NORTHWEST SIDE OF CAPTAIN'S GALLEY, LOOKING EAST - Huntington Beach Municipal Pier, Pacific Coast Highway at Main Street, Huntington Beach, Orange County, CA

  15. 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

  16. 2. EXTERIOR OBLIQUE VIEW OF BUILDING 746 FROM EAST K ...

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

    2. EXTERIOR OBLIQUE VIEW OF BUILDING 746 FROM EAST K STREET, LOOKING SOUTHEAST. - Oakland Naval Supply Center, Gymnasium-Cafeteria-Theater, East K Street between Eleventh & Twelfth Streets, Oakland, Alameda County, CA

  17. 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

  18. EXTERIOR, A close up view, looking southeast at the dock ...

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

    EXTERIOR, A close up view, looking southeast at the dock and overhead piping - Department of Energy, Mound Facility, Hydrolysis House Building (HH Building), One Mound Road, Miamisburg, Montgomery County, OH

  19. EXTERIOR, A view looking southeast toward the north elevation of ...

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

    EXTERIOR, A view looking southeast toward the north elevation of the building including the dock and overhead piping and stacks - Department of Energy, Mound Facility, Hydrolysis House Building (HH Building), One Mound Road, Miamisburg, Montgomery County, OH

  20. EXTERIOR, A view looking northeast toward the south elevation and ...

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

    EXTERIOR, A view looking northeast toward the south elevation and stacks of HH Building - Department of Energy, Mound Facility, Hydrolysis House Building (HH Building), One Mound Road, Miamisburg, Montgomery County, OH

  1. EXTERIOR, A view looking northwest from far hill toward the ...

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

    EXTERIOR, A view looking northwest from far hill toward the Mounds complex and the HH Building - Department of Energy, Mound Facility, Hydrolysis House Building (HH Building), One Mound Road, Miamisburg, Montgomery County, OH

  2. EXTERIOR, A view looking northeast at the south and west ...

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

    EXTERIOR, A view looking northeast at the south and west facades of the building and staircase - Department of Energy, Mound Facility, Hydrolysis House Building (HH Building), One Mound Road, Miamisburg, Montgomery County, OH

  3. EXTERIOR, A view looking west that captures the east elevation ...

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

    EXTERIOR, A view looking west that captures the east elevation of the building with parking lot to the right - Department of Energy, Mound Facility, Hydrolysis House Building (HH Building), One Mound Road, Miamisburg, Montgomery County, OH

  4. 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

  5. 5. EXTERIOR VIEW OF ELECTROSTATIC PRECIPITATORS FOR OPEN HEARTH NO. ...

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

    5. EXTERIOR VIEW OF ELECTROSTATIC PRECIPITATORS FOR OPEN HEARTH NO. 5 (Martin Stupich) - U.S. Steel Homestead Works, Open Hearth Steelmaking Plant, Along Monongahela River, Homestead, Allegheny County, PA

  6. 3. EXTERIOR VIEW INTO PART OF OPEN HEARTH NO. 5 ...

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

    3. EXTERIOR VIEW INTO PART OF OPEN HEARTH NO. 5 WITH RAILROAD TRESTLE IN FOREGROUND. (Jet Lowe) - U.S. Steel Homestead Works, Open Hearth Steelmaking Plant, Along Monongahela River, Homestead, Allegheny County, PA

  7. 4. EXTERIOR VIEW OF ELECTROSTATIC PRECIPITATORS FOR OPEN HEARTH NO. ...

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

    4. EXTERIOR VIEW OF ELECTROSTATIC PRECIPITATORS FOR OPEN HEARTH NO. 5 (Martin Stupich) - U.S. Steel Homestead Works, Open Hearth Steelmaking Plant, Along Monongahela River, Homestead, Allegheny County, PA

  8. 9. VIEW EAST; EXTERIOR DETAIL OF WEST ELEVATION INCLUDING COLUMBUS ...

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

    9. VIEW EAST; EXTERIOR DETAIL OF WEST ELEVATION INCLUDING COLUMBUS HALL. - Naval Undersea Warfare Center, Bowditch Hall, 600 feet east of Smith Street & 350 feet south of Columbia Cove, West bank of Thames River, New London, New London County, CT

  9. 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

  10. Detail; Street Car Waiting House, support for exterior light fixture ...

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

    Detail; Street Car Waiting House, support for exterior light fixture - North Philadelphia Station, Street Car Waiting House, 2900 North Broad Street, on northwest corner of Broad Street & Glenwood Avenue, Philadelphia, Philadelphia County, PA

  11. Exterior doorway detail south side of building (first floor) east ...

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

    Exterior doorway detail south side of building (first floor) east inset porch; interior staircase visible in background - Fitzsimons General Hospital, Open Air Tuberculosis Ward, West Pennington Avenue & North Hickey Street Southwest Corner, Aurora, Adams County, CO

  12. View of exterior circumferential path at northwest side of building, ...

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

    View of exterior circumferential path at northwest side of building, looking east toward building entrance - National Zoological Park, Bird House, 3001 Connecticut Avenue NW, Washington, District of Columbia, DC

  13. 2. GENERAL EXTERIOR VIEW LOOKING WEST, SHOWING CHANNEL DOWNSTREAM FROM ...

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

    2. GENERAL EXTERIOR VIEW LOOKING WEST, SHOWING CHANNEL DOWNSTREAM FROM NAVIGATION LOCK #1; MOVABLE BRIDGE IS VISIBLE IN LEFT FOREGROUND. - Bonneville Project, Navigation Lock No. 1, Oregon shore of Columbia River near first Powerhouse, Bonneville, Multnomah County, OR

  14. 12. DETAIL EXTERIOR VIEW OF FISH PASSAGE BETWEEN THE SOUTH ...

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

    12. DETAIL EXTERIOR VIEW OF FISH PASSAGE BETWEEN THE SOUTH END OF POWERHOUSE #1 AND NAVIGATION LOCK #1. - Bonneville Project, Navigation Lock No. 1, Oregon shore of Columbia River near first Powerhouse, Bonneville, Multnomah County, OR

  15. 9. DETAIL EXTERIOR VIEW LOOKING SOUTHEAST, SHOWING DOWNSTREAM MITER GATES ...

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

    9. DETAIL EXTERIOR VIEW LOOKING SOUTHEAST, SHOWING DOWNSTREAM MITER GATES FOR NAVIGATION LOCK #1. - Bonneville Project, Navigation Lock No. 1, Oregon shore of Columbia River near first Powerhouse, Bonneville, Multnomah County, OR

  16. 12. Exterior detail view of roof structure at eave, showing ...

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

    12. Exterior detail view of roof structure at eave, showing exposed rafter tails, skip sheathing and gutter - American Railway Express Company Freight Building, 1060 Northeast Division Street, Bend, Deschutes County, OR

  17. Low-cost exterior insulation process and structure

    DOEpatents

    Vohra, A.

    1999-03-02

    A low-cost exterior insulation process of stacking bags of insulating material against a wall and covering them with wire mesh and stucco provides a durable structure with good insulating value. 2 figs.

  18. EXTERIOR VIEW, BEE HIVE COKE OVEN DOOR. Pratt Coal ...

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

    EXTERIOR VIEW, BEE HIVE COKE OVEN DOOR. - Pratt Coal & Coke Company, Pratt Mines, Coke Ovens & Railroad, Bounded by First Street, Avenue G, Third Place, Birmingham Southern Railroad, Birmingham, Jefferson County, AL

  19. 2. EXTERIOR SITE VIEW OF STRUCTURE 408 AND RADOME 409 ...

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

    2. EXTERIOR SITE VIEW OF STRUCTURE 408 AND RADOME 409 ON RIGHT, LOOKING NORTHEAST. - Mill Valley Air Force Station, Radar Domes, East Ridgecrest Boulevard, Mount Tamalpais, Mill Valley, Marin County, CA

  20. 1. GENERAL EXTERIOR VIEW OF THE ELECTRIC FURNACE STEELMAKING PLANT ...

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

    1. GENERAL EXTERIOR VIEW OF THE ELECTRIC FURNACE STEELMAKING PLANT LOOKING NORTHEAST. - U.S. Steel Duquesne Works, Electric Furnace Steelmaking Plant, Along Monongahela River, Duquesne, Allegheny County, PA

  1. 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

  2. 2. EXTERIOR VIEW LOOKING SOUTHEAST AT ELECTRIC FURNACE BUILDING AND ...

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

    2. EXTERIOR VIEW LOOKING SOUTHEAST AT ELECTRIC FURNACE BUILDING AND ELECTRIC FURNACE OFFICE & CHEMICAL LABORATORY BUILDING. INGOT MOLDS IN RIGHT FOREGROUND. - U.S. Steel Duquesne Works, Electric Furnace Steelmaking Plant, Along Monongahela River, Duquesne, Allegheny County, PA

  3. Exterior oblique view of the east end and the south ...

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

    Exterior oblique view of the east end and the south side. Showing the Dust Collector on the right. View facing northwest - U.S. Naval Base, Pearl Harbor, Sawmill, Seventh Street near Avenue E, Pearl City, Honolulu County, HI

  4. 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

  5. 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

  6. 1. Mill exterior, high grade chute partially restored on the ...

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

    1. Mill exterior, high grade chute partially restored on the outside of mill building center of picture. Looking northeast from below bridge. - Kennecott Copper Corporation, Concentration Mill, On Copper River & Northwestern Railroad, Kennicott, Valdez-Cordova Census Area, AK

  7. 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

  8. 22. EXTERIOR DETAIL VIEW OF SOUTHEAST CORNER OF BRIDGE, 1932 ...

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

    22. EXTERIOR DETAIL VIEW OF SOUTHEAST CORNER OF BRIDGE, 1932 SECTION, SOUTH BANK, LOOKING NORTHEAST TO SOUTHWEST - Rowdy Creek Bridge, Spanning Rowdy Creek at Fred Haight Drive, Smith River, Del Norte County, CA

  9. EXTERIOR VIEW, POWELL AVENUE (SOUTH) ELEVATION, PEDESTRIAN PASSAGEWAY AT LEFT ...

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

    EXTERIOR VIEW, POWELL AVENUE (SOUTH) ELEVATION, PEDESTRIAN PASSAGEWAY AT LEFT SIDE OF UNDERPASS - Twentieth Street Underpass, At Railroad Reservation, Twentieth Street at the Tracks between Morris & Powell Avenues, Birmingham, Jefferson County, AL

  10. 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

  11. 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

  12. EXTERIOR VIEW OF THE FRONT AND NORTHWEST SIDE OF BUILDING ...

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

    EXTERIOR VIEW OF THE FRONT AND NORTHWEST SIDE OF BUILDING 471 FACING SOUTH - U.S. Naval Base, Pearl Harbor, Waterfront Transit Shed, Corner of Northampton Avenue & Simms Street, Pearl City, Honolulu County, HI

  13. EXTERIOR VIEW OF THE FRONT AND SOUTH SIDE OF BUILDING ...

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

    EXTERIOR VIEW OF THE FRONT AND SOUTH SIDE OF BUILDING 447 FACING NORTHWEST - U.S. Naval Base, Pearl Harbor, Waterfront Transit Shed, Between Northampton Avenue & Wharf K3, Pearl City, Honolulu County, HI

  14. EXTERIOR VIEW OF THE REAR AND SOUTH SIDE OF BUILDING ...

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

    EXTERIOR VIEW OF THE REAR AND SOUTH SIDE OF BUILDING 477 FACING NORTH - U.S. Naval Base, Pearl Harbor, Waterfront Transit Shed, Corner of Astoria Avenue & Gaffney Street, Pearl City, Honolulu County, HI

  15. EXTERIOR VIEW OF THE REAR AND SOUTHEAST SIDE OF BUILDING ...

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

    EXTERIOR VIEW OF THE REAR AND SOUTHEAST SIDE OF BUILDING 471 FACING NORTHEAST - U.S. Naval Base, Pearl Harbor, Waterfront Transit Shed, Corner of Northampton Avenue & Simms Street, Pearl City, Honolulu County, HI

  16. EXTERIOR VIEW OF THE FRONT AND NORTH SIDE OF BUILDING ...

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

    EXTERIOR VIEW OF THE FRONT AND NORTH SIDE OF BUILDING 477 FACING SOUTH - U.S. Naval Base, Pearl Harbor, Waterfront Transit Shed, Corner of Astoria Avenue & Gaffney Street, Pearl City, Honolulu County, HI

  17. EXTERIOR VIEW OF THE FRONT AND NORTH SIDE OF BUILDING ...

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

    EXTERIOR VIEW OF THE FRONT AND NORTH SIDE OF BUILDING 447 FACING SOUTHWEST - U.S. Naval Base, Pearl Harbor, Waterfront Transit Shed, Between Northampton Avenue & Wharf K3, Pearl City, Honolulu County, HI

  18. 4. Exterior, detail south elevation, showing jointing of logs on ...

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

    4. Exterior, detail south elevation, showing jointing of logs on later extension. Sept. 12, 1940. Mixon. - Upper Swedish Log Cabin, Darby Creek vicinity, Clifton Heights (Upper Darby Township), Darby, Delaware County, PA

  19. 2. Exterior, general view of rear and end, from west. ...

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

    2. Exterior, general view of rear and end, from west. Sept. 12, 1940. Photo by Stanly P. Mixon. - Upper Swedish Log Cabin, Darby Creek vicinity, Clifton Heights (Upper Darby Township), Darby, Delaware County, PA

  20. 3. Exterior, detail view of north elevation, from northeast, showing ...

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

    3. Exterior, detail view of north elevation, from northeast, showing joint of addition. Sept. 12, 1940. Mixon. - Upper Swedish Log Cabin, Darby Creek vicinity, Clifton Heights (Upper Darby Township), Darby, Delaware County, PA

  1. 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

  2. VIEW OF LAMP FIXTURE (EXTERIOR) ADJACENT TO ENTRANCE AT SOUTHWEST ...

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

    VIEW OF LAMP FIXTURE (EXTERIOR) ADJACENT TO ENTRANCE AT SOUTHWEST CORNER OF BUILDING 23, FACING NORTH - Roosevelt Base, Auditorium-Gymnasium, West Virginia Street between Richardson & Reeves Avenues, Long Beach, Los Angeles County, CA

  3. 3. DETAIL EXTERIOR VIEW LOOKING SOUTHEAST SHOWING CENTER GABLE SECTION ...

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

    3. DETAIL EXTERIOR VIEW LOOKING SOUTHEAST SHOWING CENTER GABLE SECTION OF THE FISH HATCHERY BUILDING. - Bonneville Project, Fish Hatchery, On Columbia River bordered on South by Union Pacific, Bonneville, Multnomah County, OR

  4. 24. DETAIL EXTERIOR VIEW LOOKING EAST, SHOWING FISH LADDER AT ...

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

    24. DETAIL EXTERIOR VIEW LOOKING EAST, SHOWING FISH LADDER AT NORTH END OF DAM/SPILLWAY; WATER FLOWING THROUGH FISH LADDER IS VISIBLE AT BOTTOM. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

  5. 2. GENERAL EXTERIOR VIEW OF FISH HATCHERY BUILDING LOOKING NORTH; ...

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

    2. GENERAL EXTERIOR VIEW OF FISH HATCHERY BUILDING LOOKING NORTH; REINFORCED CONCRETE FISH PONDS IN FOREGROUND. - Bonneville Project, Fish Hatchery, On Columbia River bordered on South by Union Pacific, Bonneville, Multnomah County, OR

  6. 6. DETAIL EXTERIOR VIEW OF WINDOW SHUTTERS ON OUTSIDE OF ...

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

    6. DETAIL EXTERIOR VIEW OF WINDOW SHUTTERS ON OUTSIDE OF FISH HATCHERY BUILDING. - Bonneville Project, Fish Hatchery, On Columbia River bordered on South by Union Pacific, Bonneville, Multnomah County, OR

  7. 1. GENERAL EXTERIOR VIEW LOOKING SOUTH, SHOWING FACADE OF FISH ...

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

    1. GENERAL EXTERIOR VIEW LOOKING SOUTH, SHOWING FACADE OF FISH HATCHERY BUILDING. - Bonneville Project, Fish Hatchery, On Columbia River bordered on South by Union Pacific, Bonneville, Multnomah County, OR

  8. 22. DETAIL EXTERIOR VIEW LOOKING NORTHWEST, SHOWING FISH LADDER AT ...

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

    22. DETAIL EXTERIOR VIEW LOOKING NORTHWEST, SHOWING FISH LADDER AT NORTH END OF DAM/SPILLWAY; VIEW SHOWS SECTION OF FISH LADDER NEAR WHERE IT ENTERS THE COLUMBIA RIVER. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

  9. 9. GENERAL EXTERIOR VIEW LOOKING NORTH, SHOWING FORMER FISH HATCHERY ...

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

    9. GENERAL EXTERIOR VIEW LOOKING NORTH, SHOWING FORMER FISH HATCHERY OFFICE BUILDING (PRESENTLY USED AS GARDENER'S OFFICE). - Bonneville Project, Fish Hatchery, On Columbia River bordered on South by Union Pacific, Bonneville, Multnomah County, OR

  10. 4. DETAIL EXTERIOR VIEW OF FISH HATCHERY BUILDING'S CENTRAL GABLE; ...

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

    4. DETAIL EXTERIOR VIEW OF FISH HATCHERY BUILDING'S CENTRAL GABLE; MASONRY WALL AND FLOWERBED IN FOREGROUND. - Bonneville Project, Fish Hatchery, On Columbia River bordered on South by Union Pacific, Bonneville, Multnomah County, OR