Sample records for galactic rings exterior

  1. MSXMSX Infrared Dark Clouds in the BUInfrared Dark Clouds in the BU--FCRAO Galactic Ring Survey:FCRAO Galactic Ring Survey: A Galactic Ring PopulationA Galactic Ring Population

    E-print Network

    -forming and quiescent molecular gas comprising the 5 kpc Galactic Ring. The Midcourse Space Experiment (MSX) surveyed. 2001, AJ 121, 2819). GRSGRS andand MSX datasetsMSX datasets Dark cloud identificationDark cloud.5-15.9 µm E: 18.2-25.1 µm MSX Band Spectral Res.: 0.25 km s-1 Sensitivity: 0.4 K 46"/ 22": 18° to 52° b: -1

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

    SciTech Connect

    Li Jing; Deng Licai; Xu Yan [Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China); Newberg, Heidi Jo; Carlin, Jeffrey L.; Newby, Matthew; Willett, Benjamin A. [Department of Physics, Applied Physics and Astronomy, Rensselaer Polytechnic Institute, Troy, NY 12180 (United States); Luo Zhiquan, E-mail: lijing@bao.ac.cn, E-mail: heidi@rpi.edu [School of Physics and Electronic Information, China West Normal University, Nanchong 637002 (China)

    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.

  3. A relationship between galactic cosmic radiation and tree rings.

    PubMed

    Dengel, Sigrid; Aeby, Dominik; Grace, John

    2009-11-01

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

  4. Infalling Gas onto the Galactic Center Circumnuclear Ring

    NASA Astrophysics Data System (ADS)

    Sato, Mamiko T.; Tsuboi, Masato

    2008-10-01

    The central region of our Galaxy (Sgr A*) is the nearest galactic center harboring a massive black hole. The environment around Sgr A* is a topic of interest to diverse fields. We are interested in gas feeding from giant molecular clouds (GMC) within 10 pc of the Galactic center to the Circumnuclear Ring (CND), which is presumable A?glay-down bay A?h of infalling gas toward Sgr A*. In order to reveal the mechanism, we observed SiO J = 2-1 ? = 0 and H13CO+ J = 1-0 lines using the Nobeyama Millimeter Array (NMA). We depicted the CND clearly in SiO line. Molecular gas in CND rotates interacting each other. We observed two molecular streamers to CND in SiO line. One is a new detection. The line intensity ratios at overlapping points of streamers with CND are significantly higher (I(SiO)/I(H13CO+)>8) than the average of CND (about 2-4). This is a strong evidence indicating these streamers are connecting to the CND.

  5. Infalling gas onto the Galactic center circumnuclear ring

    NASA Astrophysics Data System (ADS)

    Sato, M. T.; Tsuboi, M.

    2008-10-01

    The central region of our Galaxy (Sgr A*) is the nearest galactic center harboring a massive black hole. The environment around Sgr A* is a topic of interest to diverse fields. We are interested in gas feeding from giant molecular clouds (GMC) within 10 pc of the Galactic center to the Circumnuclear Ring/Disk (CND), which is presumable 'lay-down bay' of infalling gas toward Sgr A*. In order to reveal the mechanism, we observed the CND and its surroundings in SiO and H13 CO+ lines using Nobeyama Millimeter Array (NMA). We depict the CND clearly in both lines and some molecular streamers to the CND in only SiO line including one new detection. The line intensity ratios at overlapping points of streamers with the CND are higher (I(SiO)/I(H13CO+) > 6) than the average of CND (2 4). This is a strong evidence indicating these streamers are connecting to the CND. Some components at the outer region of the CND are also detected in both lines. We also estimate the rotation velocity of the CND as 110±10 km s-1 and of just a bit outside from the CND as 93±14 km s-1. The estimation of the rotation velocity in the distance range of 5-10 pc from the Sgr A* has a great meaning since there have been few report about the kinematic parameters at just outside of the CND.

  6. Galactic rings and secular evolution in barred galaxies

    NASA Astrophysics Data System (ADS)

    Knapen, Johan H.

    2015-03-01

    Rings are common in galaxies. Several kinds of rings are known: collisional, polar, and resonance rings, of which the latter is by far most common. Resonance rings are prime tracers of the underlying dynamical structure of disk galaxies, in particular of orbital resonances and of manifolds. Rings are also indicators of angular momentum transport, and this is a key factor in secular evolution (see the various reviews in Falcón-Barroso & Knapen 2012). Resonance rings come in three flavours, primarily defined by their size, namely nuclear, inner, and outer rings. From studies like those of Buta (1995), Knapen (2005) and Comerón et al. (2010, 2013) we know that the radii of nuclear rings range from a few tens of parsec to some 3.5 kpc, while inner rings and outer rings have typical radii of 1.2 and 2.5-3 times the length of the bar. Many host galaxies of rings are barred, but so are most galaxies in general. Some 20% of all rings occur in non-barred galaxies, which implies that rings do not, or hardly, occur preferentially in barred galaxies (Knapen 2005, Comerón et al. 2010, 2013). In most non-barred ringed galaxies an oval, a past interaction, or even a prominent spiral pattern lies at the dynamical origin of the ring, but this needs additional scrutiny. From an inventory of all known nuclear rings, Comerón et al. (2010) reach the following conclusions. Star-forming nuclear rings occur in 20 +/- 2% of disk galaxies with -3 < T < 7; 18/96 occur in disk galaxies without a bar (19%); they are found in S0 to Sd galaxies, peaking in types Sab Sb; when nuclear rings occur in barred galaxies, the ring radius is limited to one quarter of the bar radius; and stronger bars host smaller rings (cf. Knapen 2005). We are now using the Spitzer Survey of Spiral Structure in Galaxies (S4G; Sheth et al. 2010) to expand our survey to inner and outer rings (Comerón et al. 2013). We aim to study the relations between ring and host properties - as we did before for nuclear rings. We will use the S4G sample size and image depth to reach further insight into the secular evolution of galaxies by measuring structural properties of rings, as well as those of components like bars and disks. We will then be able to tackle outstanding questions such as the origin of rings in non-barred galaxies, and how exactly ring properties are determined by the bar.

  7. THE LESSER ROLE OF SHEAR IN GALACTIC STAR FORMATION: INSIGHT FROM THE GALACTIC RING SURVEY

    SciTech Connect

    Dib, Sami; Dariush, Ali [Astrophysics Group, Blackett Laboratory, Imperial College London, London SW7 2AZ (United Kingdom); Helou, George [Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125 (United States); Moore, Toby J. T. [Astrophysics Research Institute, Liverpool John Moores University, Twelve Quays House, Egerton Wharf, Birkenhead CH41 1LD (United Kingdom); Urquhart, James S., E-mail: s.dib@imperial.ac.uk [Max-Planck Institut fuer Radioastronomie, Auf dem Huegel 69, 53121 Bonn (Germany)

    2012-10-20

    We analyze the role played by shear in regulating star formation in the Galaxy on the scale of individual molecular clouds. The clouds are selected from the {sup 13}CO J = 1-0 line of the Galactic Ring Survey. For each cloud, we estimate the shear parameter which describes the ability of density perturbations to grow within the cloud. We find that for almost all molecular clouds considered, there is no evidence that shear is playing a significant role in opposing the effects of self-gravity. We also find that the shear parameter of the clouds does not depend on their position in the Galaxy. Furthermore, we find no correlations between the shear parameter of the clouds with several indicators of their star formation activity. No significant correlation is found between the shear parameter and the star formation efficiency of the clouds which is measured using the ratio of the massive young stellar objects luminosities, measured in the Red MSX survey, to the cloud mass. There are also no significant correlations between the shear parameter and the fraction of their mass that is found in denser clumps which is a proxy for their clump formation efficiency, nor with their level of fragmentation expressed in the number of clumps per unit mass. Our results strongly suggest that shear is playing only a minor role in affecting the rates and efficiencies at which molecular clouds convert their gas into dense cores and thereafter into stars.

  8. The Lesser Role of Shear in Galactic Star Formation: Insight from the Galactic Ring Survey

    NASA Astrophysics Data System (ADS)

    Dib, Sami; Helou, George; Moore, Toby J. T.; Urquhart, James S.; Dariush, Ali

    2012-10-01

    We analyze the role played by shear in regulating star formation in the Galaxy on the scale of individual molecular clouds. The clouds are selected from the 13CO J = 1-0 line of the Galactic Ring Survey. For each cloud, we estimate the shear parameter which describes the ability of density perturbations to grow within the cloud. We find that for almost all molecular clouds considered, there is no evidence that shear is playing a significant role in opposing the effects of self-gravity. We also find that the shear parameter of the clouds does not depend on their position in the Galaxy. Furthermore, we find no correlations between the shear parameter of the clouds with several indicators of their star formation activity. No significant correlation is found between the shear parameter and the star formation efficiency of the clouds which is measured using the ratio of the massive young stellar objects luminosities, measured in the Red MSX survey, to the cloud mass. There are also no significant correlations between the shear parameter and the fraction of their mass that is found in denser clumps which is a proxy for their clump formation efficiency, nor with their level of fragmentation expressed in the number of clumps per unit mass. Our results strongly suggest that shear is playing only a minor role in affecting the rates and efficiencies at which molecular clouds convert their gas into dense cores and thereafter into stars.

  9. Two-component outer ring and the observed galactic spiral structure

    NASA Astrophysics Data System (ADS)

    Mel'nik, A. M.; Rautiainen, P.

    2013-10-01

    We show that a model of the Galaxy with a two-component outer ring of class R_1R_2 can explain many large-scale morphological features of the galactic spiral structure. The Carina-Sagittarius arm may consist of two ascending segments of outer R_1 and R_2 rings, which almost touch each other near the Carina region. The Perseus and Crux arms can be partially identified with the descending segments of the R_2 ring. A model of a two-component outer ring can also explain the existence of some tangential directions.

  10. A radial velocity survey of low Galactic latitude structures - II. The Monoceros Ring behind the Canis Major dwarf galaxy

    Microsoft Academic Search

    Blair C. Conn; Nicolas F. Martin; Geraint F. Lewis; Rodrigo A. Ibata; Michele Bellazzini; Mike J. Irwin

    2005-01-01

    An AAT\\/2dF Spectrograph Survey of low Galactic latitudes targeting the putative Canis Major dwarf galaxy and the (possibly) associated tidal debris of stars known as the Monoceros Ring, covering Galactic coordinates and , has revealed the presence of the Monoceros Ring in the background of the Canis Major dwarf galaxy. This detection resides at a Galactocentric distance of ~18.9 +\\/-

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

    E-print Network

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

    2006-02-07

    The Boston University-Five College Radio Astronomy Observatory Galactic Ring Survey is a new survey of Galactic 13CO (1-0) emission. The survey used the SEQUOIA multi pixel array on the Five College Radio Astronomy Observatory 14 m telescope to cover a longitude range of l = 18 deg-55.7 deg and a latitude range of |b| 40 deg. At the velocity resolution of 0.21 km/s, the typical rms sensitivity is sigma(TA*)~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 dataset. We also discuss the telescope and instrumental parameters, the observing modes, the data reduction processes, and the emission and noise characteristics of the dataset. The Galactic Ring Survey data are available to the community at www.bu.edu/galacticring or in DVD form by request.

  12. CO multiline observations near the Galactic 5kpc Ring with KOSMA

    NASA Astrophysics Data System (ADS)

    Brüll, M.; Kramer, C.; Stutzki, J.

    We present first results of a low-J CO survey of an extended region area at the edge of the 5kpc Galactic Ring. These ongoing observations were started in August 1999 and have been conducted with the KOSMA 3m telescope in the on-the-fly modus. At present, we observed a 0.4 deg2 region in 13CO 2--1 and in 12CO 3--2 comprising 6534 positions on a fully sampled grid. Observations of other isotopomers and extensions of the present area are planned. The 5kpc ring of our Galaxy shows up prominently on the Columbia Milky Way survey and is known for its high star formation rate relative to the rest of the Milky Way. The FCRAO started to map a large part of the ring in 13CO 1--0 at high resolutions. To study excitation conditions and their variation, we selected for KOSMA one extended filament showing up at ~60 kms-1, the velocity of the Galactic Ring at a distance of 10 kpc. In addition, the selected region shows emission of almost local material at ~20 kms-1. This study thus allows to compare different parts of the Milky Way simultaneously, allowing for a good relative calibration accuracy. Observations of the 2--1 and 3--2 CO transitions traces the denser and warmer material along the lines of sight, since their critical densities and upper level excitation temperatures reach 104 cm-3 and 33 K. Our observations will thus allow to distinguish between extended, quiescent gas and localized region, influenced by star formation. We will try to explain any deviations from LTE and homogeneous cloud models by models of photon dominated regions, which take into account density and temperature gradients. For further information of the current status, please visit our web site at < AHREF="www.ph1.uni-koeln.de/5kpc">Survey

  13. CO Multiline Observations near the Galactic 5kpc Ring with KOSMA

    NASA Astrophysics Data System (ADS)

    Brüll, M.; Kramer, C.; Stutzki, J.

    We present first results of a low-J CO survey of an extended region at the edge of the 5kpc Galactic Ring. These ongoing observations were started in August 1999 with the KOSMA 3m telescope using the on-the-fly modus. At present, we have observed a 0.4 deg2 region in 13CO 2-1 and in 12CO 3-2 comprising 6534 positions. Observations of other isotopomers and extensions of the present area are planned. The 5kpc ring of our Galaxy shows up prominently on the Columbia Milky Way survey and is known for its high star formation rate. The FCRAO has started to map the ring in 13CO 1-0. To study excitation conditions and their variation, we selected one extended filament showing up at ~60 kms-1, the velocity of the Galactic Ring at a distance of 10 kpc. In addition, the selected region shows emission of almost local material at ~20 kms-1. This study thus allows to compare different parts of the Milky Way simultaneously, allowing for a good relative calibration accuracy. Observations of the 2-1 and 3-2 CO transitions traces the denser and warmer material along the lines of sight, since their critical densities and upper level excitation temperatures reach 104 cm-3 and 33 K. Our observations thus allow to distinguish between extended, quiescent gas and localized regions, influenced by star formation. Please visit our web site at , www.ph1.uni-koeln.de/5kpc for further information of the current status.

  14. A radial velocity survey of low Galactic latitude structures: II. The Monoceros Ring behind the Canis Major dwarf galaxy

    Microsoft Academic Search

    Blair C. Conn; Nicolas F. Martin; Geraint F. Lewis; Rodrigo A. Ibata; Michele Bellazzini; Mike J. Irwin

    2005-01-01

    An AAT\\/2dF Spectrograph Survey of low Galactic latitudes targeting the\\u000aputative Canis Major dwarf galaxy, and the (possibly) associated tidal debris\\u000aof stars known as the Monoceros Ring, covering Galactic coordinates\\u000a231.5$^{\\\\circ}< ${\\\\it l} $<$ 247.5$^{\\\\circ}$ and -11.8$^{\\\\circ}<${\\\\it\\u000ab}$<-3.8^{\\\\circ}$, has revealed the presence of the Monoceros Ring in the\\u000abackground of the Canis Major dwarf galaxy. This detection resides at

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

    2011-07-10

    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.

  16. FIVE STAR-FORMING CORES IN THE GALACTIC RING SURVEY: A MID-INFRARED STUDY Kathleen E. Kraemer,1,2,3

    E-print Network

    Clemens, Dan

    FIVE STAR-FORMING CORES IN THE GALACTIC RING SURVEY: A MID-INFRARED STUDY Kathleen E. Kraemer,1 the Galactic Ring Survey (GRS), in the mid- infrared with the MIRAC3 instrument. We obtained high spatial by extended emission on large scales (e20 ). The extended mid-infrared structure is well

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

    SciTech Connect

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

    2011-05-15

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

  18. 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.

  19. Matching Exterior to Interior Solutions in Weyl Gravity: Comment on ``Exact Vacuum Solution to Conformal Weyl Gravity and Galactic Rotation Curves''

    Microsoft Academic Search

    Volker Perlick; Chongming Xu

    1995-01-01

    Recently Mannheim and Kazanas presented the static, spherically symmetric exact vacuum solution of Weyl gravity and suggested that it could be fitted to general relativistic experimental tests in the solar system and to the observed galactic rotation curves. Here we discuss matching this solution to an interior one that satisfies the weak energy condition and a regularity condition at the

  20. The BU--FCRAO Milky Way Galactic Ring Survey I. The first two Square Degrees

    E-print Network

    traced by CO) for the Northern Galactic disk (adapted from Clemens, Sanders & Scoville 1988, ApJ, 327, 30; Scoville & Solomon 1975, ApJ, 199, L105), it remains largely unexplored. Faced with the obstacle

  1. Distribution and kinematics of classical cepheids in the Galactic outer ring

    NASA Astrophysics Data System (ADS)

    Mel'nik, A. M.; Rautiainen, P.; Berdnikov, L. N.; Dambis, A. K.; Rastorguev, A. S.

    The existence of an outer ring in the Galaxy can explain the kinematics of OB associations in the Perseus and Sagittarius stellar-gas complexes. Moreover, it can also explain the orientation of the Carina arm with respect to the major axis of the bar. We show that the morphological and kinematical features of the sample of classical cepheids are consistent with the presence of a two-component outer ring in the Galaxy.

  2. 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.

  3. Galactic Twins of the Ring Nebula Around SN1987A and a Possible LBV-like Phase for Sk-69 202

    E-print Network

    Nathan Smith

    2007-05-21

    Some core-collapse supernovae show clear signs of interaction with dense circumstellar material that often appears to be non-spherical. Circumstellar nebulae around supernova progenitors provide clues to the origin of that asymmetry in immediate pre-supernova evolution. Here I discuss outstanding questions about the formation of the ring nebula around SN1987A and some implications of similar ring nebulae around Galactic B supergiants. Several clues hint that SN1987A's nebula may have been ejected in an LBV-like event, rather than through interacting winds in a transition from a red supergiant to a blue supergiant.

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

    2011-10-20

    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.

  5. 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

  6. Exterior dimension of fat fractals

    Microsoft Academic Search

    C. Grebogi; S. W. McDonald; E. Ott; J. A. Yorke

    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

  7. Exterior dimension of fat fractals

    NASA Astrophysics Data System (ADS)

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

    1985-07-01

    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.

  8. 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.

  9. CLEMSON UNIVERSITY Accessible Exterior Routes

    E-print Network

    Duchowski, Andrew T.

    Campus Improvements #12; » Fluor Daniel Plaza Budget $50k Project completeCLEMSON UNIVERSITY Accessible Exterior Routes Project Update MAY, 2013 STATUS -Edwards Hall -Vickery (ALC) -Cooper Library #12;#12;Project Priority · High demand building

  10. Theory of the X-ray emission of the extended galactic source Monogem Ring in the constellation Monoceros

    SciTech Connect

    Krol, V.A.

    1984-01-01

    A study is made of the X-ray emission of the source Monogem Ring, for which a possible generation mechanism is thermal bremsstrahlung of hot gas filling the interior of a spherical shock wave produced by a supernova explosion. An analytic expression is obtained for the X-ray spectra for this generation mechanism in the cases when the undisturbed interstellar gas surrounding the supernova before the explosion has a constant uniform density distribution and a density distribution in accordance with a power law. The calculated spectra are compared with the observational data, and good agreement is obtained in both cases. 14 references.

  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 ?˜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. 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

    ...TA-W-73,230A] Plastic Omnium Automotive Exteriors, LLC, Anderson, SC; Plastic Omnium Automotive Exteriors, LLC, Troy, MI; Amended...applicable to workers of Plastic Omnium Automotive Exteriors, LLC, Anderson, South...

  13. Dynamical evolution of Saturn's F ring dust particles

    Microsoft Academic Search

    R. Sfair; S. M. Giuliatti Winter; D. C. Mourão; O. C. Winter

    2009-01-01

    Saturn's F ring has been the subject of study due to its peculiar structure and the proximity to two satellites, named Prometheus (interior) and Pandora (exterior to the ring), which cause perturbations to the ring particles. Early results from Voyager data have proposed that the ring is populated with centimetre- and micrometre-sized particles. The Cassini spacecraft also detected a less

  14. Boundary and Exterior of a Multiset Topology

    E-print Network

    J. Mahanta; D. Das

    2015-01-26

    The concepts of exterior and boundary in multiset topological space are introduced. We further established few relationships between the concepts of boundary, closure, exterior and interior of an M- set. These concepts have been pigeonholed by other existing notions viz., open sets, closed sets, clopen sets and limit points. The necessary and sufficient condition for a multiset to have an empty exterior is also discussed.

  15. Differential complexes and exterior calculus

    E-print Network

    Jenny Harrison

    2006-06-07

    In this paper we present a new theory of calculus over $k$-dimensional domains in a smooth $n$-manifold, unifying the discrete, exterior, and continuum theories. The calculus begins at a single point and is extended to chains of finitely many points by linearity, or superposition. It converges to the smooth continuum with respect to a norm on the space of ``pointed chains,'' culminating in the chainlet complex. Through this complex, we discover a broad theory of coordinate free, multivector analysis in smooth manifolds for which both the classical Newtonian calculus and the Cartan exterior calculus become special cases. The chainlet operators, products and integrals apply to both symmetric and antisymmetric tensor cochains. As corollaries, we obtain the full calculus on Euclidean space, cell complexes, bilayer structures (e.g., soap films) and nonsmooth domains, with equal ease. The power comes from the recently discovered prederivative and preintegral that are antecedent to the Newtonian theory. These lead to new models for the continuum of space and time, and permit analysis of domains that may not be locally Euclidean, or locally connected, or with locally finite mass.

  16. THE MOLECULAR PROPERTIES OF GALACTIC H II REGIONS

    E-print Network

    Anderson, L. D.

    We derive the molecular properties for a sample of 301 Galactic H II regions including 123 ultra compact (UC), 105 compact, and 73 diffuse nebulae. We analyze all sources within the BU-FCRAO Galactic Ring Survey (GRS) of ...

  17. 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.

  18. 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 being white or yellow and the faintest purple.

    The Jet Propulsion Laboratory, Pasadena, CA manages the mission for NASA's Office of Space Science, Washington, DC.

    This image and other images and data received from Galileo are posted on the World Wide Web, on the Galileo mission home page at: http://galileo.jpl.nasa.gov. Background information and educational context for the images can be found at: http:/ /www.jpl.nasa.gov/galileo/sepo.

  19. 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.

  20. Collar nut and thrust ring

    DOEpatents

    Lowery, Guy B. (Aiken, SC)

    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.

  1. 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

  2. Excavationless Exterior Foundation Insulation Exploratory Study

    SciTech Connect

    Mosiman, G.; Wagner, R.; Schirber, T.

    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.

  3. 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.

  4. The exterior degree of symmetric group of order six

    NASA Astrophysics Data System (ADS)

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

    2013-04-01

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

  5. 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).

  6. Jupiter's Main Ring

    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. Some radial structure is barely visible across the ring's ansa. A faint mist of particles can be seen above and below the main rings; this vertically extended 'halo' is unusual in planetary rings, and is probably caused by electromagnetic forces pushing the smallest grains out of the ring plane. Because of shadowing, the halo is not visible close to Jupiter in the lower right part of the mosaic.

    Jupiter's main ring is a thin strand of material encircling the planet. The diffuse innermost boundary begins at approximately 123,000 km. The main ring's outer radius is found to be at 128,940 +/-50 km, slightly less than the Voyager value of 129,130 +/-100 km, but very close to the orbit of the satellite Adrastea (128,980 km). The main ring exhibits a marked drop in brightness at 127,849 +/-50 km, lying almost atop the orbit of the Jovian moon Metis at 127,978 km. Satellites seem to affect the structure of even tenuous rings like that found at Jupiter.

    The Jet Propulsion Laboratory, Pasadena, CA manages the mission for NASA's Office of Space Science, Washington, DC.

    This image and other images and data received from Galileo are posted on the World Wide Web, on the Galileo mission home page at: http://galileo.jpl.nasa.gov. Background information and educational context for the images can be found at: http:/ /www.jpl.nasa.gov/galileo/sepo.

  7. Exact vacuum solution to conformal Weyl gravity and galactic rotation curves

    NASA Technical Reports Server (NTRS)

    Mannheim, Philip D.; Kazanas, Demosthenes

    1989-01-01

    The complete, exact exterior solution for a static, spherically symmetric source in locally conformal invariant Weyl gravity is presented. The solution includes the familiar exterior Schwarzschild solution as a special case and contains an extra gravitational potential term which grows linearly with distance. The obtained solution provides a potential explanation for observed galactic rotation curves without the need for dark matter. The solution also has some interesting implications for cosmology.

  8. Automated visual inspection of an airplane exterior

    NASA Astrophysics Data System (ADS)

    Jovan?evi?, 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.

  9. Exterior of Opportunity Heat Shield, Sol 344

    NASA Technical Reports Server (NTRS)

    2005-01-01

    NASA's Mars Exploration Rover Opportunity took a detailed look at what was once the exterior of its heat shield. Hitting the martian surface inverted the heat shield, making it difficult to photograph the outside where evidence of any atmospheric effects may be found.

    Engineers sought this image to help determine how the heat shield weathered the intense frictional heat created as it passed through the martian atmosphere.

    This is an approximately true-color rendering of the scene acquired around 12:47 p.m. local solar time on Opportunity's sol 344 (Jan. 11, 2005) using panoramic camera filters at wavelengths of 750, 530, and 430 nanometers.

  10. Laboratory and exterior durability of high performance acrylic sealants

    SciTech Connect

    Demarest, V.A.; Dionne, J.A.; Lertora, M.; Magnotta, J.R. [Rohm and Haas Co., Spring House, PA (United States). Caulk and Sealants Group

    1998-12-31

    This paper documents the laboratory and exterior durability of high performance, Class 25 acrylic sealants. Commercial silicone and polyurethane sealants are used as controls. Laboratory durability is evaluated by measuring sealant flexibility, tensile properties and ASTM C920 and ISO 11600 joint movement capabilities. Many of these properties are measured both before and after 2500 hours of Weather-Ometer exposure. Exterior durability is assessed by monitoring 2 to 15 year exterior exposures in moving joints in low rise commercial buildings of brick, aluminum and Exterior Insulation Finishing Systems (EIFS) construction. Both laboratory and exterior durability measurements indicate that high performance Class 25 acrylic sealants have good joint movement capabilities, excellent weatherability and aesthetics, and are generally able to maintain an effective seal to a variety of substrates after extended exterior exposure. They perform and test in a manner similar to other Class 25 sealants of alternative chemistries.

  11. The Anglo-Australian Telescope\\/Wide Field Imager survey of the Monoceros Ring and Canis Major dwarf galaxy - II. From l = (280-025)°

    Microsoft Academic Search

    Blair C. Conn; Geraint F. Lewis; Mike J. Irwin; Rodrigo A. Ibata; Nicolas F. Martin; Michele Bellazzini; Artem V. Tuntsov

    2008-01-01

    This paper concludes a systematic search for evidence of the Monoceros Ring and Canis Major dwarf galaxy around the Galactic plane. Presented here are the results for the Galactic longitude range of l = (280-025)°. Testing the claim that the Monoceros Ring encircles the entire Galaxy, this survey attempts to document the position of the Monoceros Ring with increasing Galactic

  12. 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?

  13. 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

  14. 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

  15. 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

  16. 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

  17. 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

  18. EXTERIOR ELEVATION AND OBLIQUE PERSPECTIVE, LOOKING NORTH, WITH DRIVE WHEELS ...

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

    EXTERIOR ELEVATION AND OBLIQUE PERSPECTIVE, LOOKING NORTH, WITH DRIVE WHEELS IN FOREGROUND. - Norfolk & Southern Steam Locomotive No. 1218, Norris Yards, East of Ruffner Road, Irondale, Jefferson County, AL

  19. 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

  20. 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

  1. 24 CFR 3280.105 - Exit facilities; exterior doors.

    Code of Federal Regulations, 2012 CFR

    2012-04-01

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

  2. 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

  3. 24 CFR 3280.105 - Exit facilities; exterior doors.

    Code of Federal Regulations, 2013 CFR

    2013-04-01

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

  4. 24 CFR 3280.105 - Exit facilities; exterior doors.

    Code of Federal Regulations, 2011 CFR

    2011-04-01

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

  5. 24 CFR 3280.105 - Exit facilities; exterior doors.

    Code of Federal Regulations, 2014 CFR

    2014-04-01

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

  6. Exterior ballistics A useful undergraduate course in applied mathematics

    Microsoft Academic Search

    Neville De Mestre

    1977-01-01

    The case is argued for exterior ballistics to be considered as a suitable subject for showing undergraduate students some of the many applications of mathematical methods and techniques. A course is outlined with comments on the value of each of the topics studied. Various methods used in the presentation and assessment of this exterior ballistics course are discussed, while a

  7. Prepared by: BMP Interior and Exterior Weed Control Audit Subcommittee 5/02/07 Interior & Exterior Greenhouse Herbicides

    E-print Network

    Keinan, Alon

    Prepared by: BMP Interior and Exterior Weed Control Audit Subcommittee 5/02/07 Interior & Exterior edible crops in treated soil for 1 year following application When to Use When weeds are actively growing the reproductive stage. Less effective in cool conditions When weeds are actively growing. Works well in cooler

  8. Galactic Superwinds

    NASA Astrophysics Data System (ADS)

    Heckman, Timothy

    1997-04-01

    I review the theory and observations of galactic-scale outflows (`superwinds') from starburst galaxies, with an emphasis on X-ray and optical data. I consider four specific galaxies as illustrative of the observed ranges of the luminosity of the starburst and the mass of the starburst's `host galaxy'. NGC 1569 is a dwarf galaxy undergoing a starburst of modest luminosity (10^9 Lsolar). M 82 is a somewhat unusual example of a low-mass early-type galaxy with a powerful nuclear starburst. NGC 253 is an L* late-type spiral galaxy containing a nuclear starburst having L_bol = 3 x 10^10 Lsolar (and is typical of the starbursts in IRAS-selected samples). Arp 220 is galactic merger whose nucleus contains a very powerful ( ~ 10^12 Lsolar) starburst (and possibly a `buried' quasar). I conclude with a brief summary of the relevance of superwinds to some current issues in galaxy formation, galaxy evolution, and the heating and enrichment of the inter-galactic medium.

  9. 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 observations: direct measurement of the still-unknown ring mass; direct in-situ sampling of ring particle composition (targeting the iron- or carbon-based red nonicy component); and radar backscattering observations. Cuzzi, J. N. et al. (2010) An Evolving View of Saturn's Dynamic Rings; Science (Inv. Review) 19 March 2010: 327. no. 5972, pp. 1470 - 1475

  10. The AAT\\/WFI survey of the Monoceros Ring and Canis Major Dwarf galaxy: II. from l = (280 - 025)deg

    Microsoft Academic Search

    Blair C. Conn; Mike J. Irwin; Rodrigo A. Ibata; Nicolas F. Martin; Michele Bellazzini; Artem V. Tuntsov

    2008-01-01

    This paper concludes a systematic search for evidence of the Monoceros Ring and Canis Major dwarf galaxy around the Galactic Plane. Presented here are the results for the Galactic longitude range of l = (280 - 025)deg. Testing the claim that the Monoceros Ring encircles the entire Galaxy, this survey attempts to document the position of the Monoceros Ring with

  11. 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.

  12. 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.

  13. 10 CFR 434.516 - Building exterior envelope.

    Code of Federal Regulations, 2013 CFR

    2013-01-01

    ...434.516 Energy DEPARTMENT OF ENERGY ENERGY CONSERVATION ENERGY CODE FOR NEW FEDERAL COMMERCIAL AND MULTI-FAMILY HIGH RISE RESIDENTIAL BUILDINGS Building Energy Cost Compliance Alternative § 434.516 Building exterior...

  14. 10 CFR 434.516 - Building exterior envelope.

    Code of Federal Regulations, 2012 CFR

    2012-01-01

    ...434.516 Energy DEPARTMENT OF ENERGY ENERGY CONSERVATION ENERGY CODE FOR NEW FEDERAL COMMERCIAL AND MULTI-FAMILY HIGH RISE RESIDENTIAL BUILDINGS Building Energy Cost Compliance Alternative § 434.516 Building exterior...

  15. 10 CFR 434.516 - Building exterior envelope.

    Code of Federal Regulations, 2014 CFR

    2014-01-01

    ...434.516 Energy DEPARTMENT OF ENERGY ENERGY CONSERVATION ENERGY CODE FOR NEW FEDERAL COMMERCIAL AND MULTI-FAMILY HIGH RISE RESIDENTIAL BUILDINGS Building Energy Cost Compliance Alternative § 434.516 Building exterior...

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

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

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

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

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

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

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

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

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

  19. 1. Exterior oblique view of north and east sides showing ...

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

    1. Exterior oblique view of north and east sides showing entrance and typical window - Fort Hood, World War II Temporary Buildings, Dispatcher House, North of Park Avenue at Forty-ninth Street, Killeen, Bell County, TX

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

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

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

  1. 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.

  2. Exterior oblique view of the north side of Building 3 ...

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

    Exterior oblique view of the north side of Building 3 from across Bay Street (at corner of Taylor Street) looking southeast - North Beach Place, 475 Bay Street, 475 Bay Street, San Francisco, San Francisco County, CA

  3. Exterior oblique detail view of typical sidewalk entry at north ...

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

    Exterior oblique detail view of typical sidewalk entry at north side of Building 3 from Bay Street sidewalk, looking southeast - North Beach Place, 475 Bay Street, 475 Bay Street, San Francisco, San Francisco County, CA

  4. 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

  5. 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

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

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

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

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

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

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

  8. 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

  9. DETAIL ELEVATION VIEW OF EXTERIOR STAIRS ON THE EAST END ...

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

    DETAIL ELEVATION VIEW OF EXTERIOR STAIRS ON THE EAST END OF BUILDING 63, FACING SOUTH. - Naval Computer & Telecommunications Area Station, Enlisted Men's Barracks, West corner of Central Street & Midway Drive, Wahiawa, Honolulu County, HI

  10. 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

  11. 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

  12. EXTERIOR VIEW OF LOWER LOCK GATES CLOSED. FROM LOCK WALL, ...

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

    EXTERIOR VIEW OF LOWER LOCK GATES CLOSED. FROM LOCK WALL, LOOKING NORTH NORTHWEST. - Illinois Waterway, La Grange Lock and Dam, 3/4 mile south of Country 795N at Illinois River, Versailles, Brown County, IL

  13. 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

  14. North exterior elevation of Pope Quadrangle. Note the bas relief ...

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

    North exterior elevation of Pope Quadrangle. Note the bas relief sculpture over the doorway, which includes the school motto, Aspirando et Perseverando. - Avon Old Farms School, 500 Avon Old Farms Road, Avon, Hartford County, CT

  15. 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

  16. 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

  17. 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

  18. 1. Photocopy of photograph (Original source unknown, date unknown) EXTERIOR, ...

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

    1. Photocopy of photograph (Original source unknown, date unknown) EXTERIOR, SOUTH FRONT OF ADOBE INCLUDING ENVIRONS - Gaspar Orena House, East de la Guerra Street, Santa Barbara, Santa Barbara County, CA

  19. 7. Photocopy of painting (Source unknown, Date unknown) EXTERIOR SOUTH ...

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

    7. Photocopy of painting (Source unknown, Date unknown) EXTERIOR SOUTH FRONT VIEW OF MISSION AND CONVENTO AFTER 1913 - Mission San Francisco Solano de Sonoma, First & Spain Streets, Sonoma, Sonoma County, CA

  20. EXTERIOR VIEW OF THE REAR AND EAST SIDE OF BUILDING ...

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

    EXTERIOR VIEW OF THE REAR AND EAST SIDE OF BUILDING T65, FACING SOUTH. - U.S. Naval Base, Pearl Harbor, Technical Materials Assembly Shed, North Road between Astoria & Quincey Avenues, Pearl City, Honolulu County, HI

  1. EXTERIOR VIEW OF THE FRONT AND EAST SIDE OF BUILDING ...

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

    EXTERIOR VIEW OF THE FRONT AND EAST SIDE OF BUILDING T65, FACING WEST. - U.S. Naval Base, Pearl Harbor, Technical Materials Assembly Shed, North Road between Astoria & Quincey Avenues, Pearl City, Honolulu County, HI

  2. EXTERIOR VIEW OF THE FRONT AND WEST SIDE OF BUILDING ...

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

    EXTERIOR VIEW OF THE FRONT AND WEST SIDE OF BUILDING T65, FACING NORTH. - U.S. Naval Base, Pearl Harbor, Technical Materials Assembly Shed, North Road between Astoria & Quincey Avenues, Pearl City, Honolulu County, HI

  3. Exterior oblique view of the south end of Building 6 ...

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

    Exterior oblique view of the south end of Building 6 from Francisco Street sidewalk, looking northeast - North Beach Place, 401 Bay Street, 500 Francisco Street, 401 Bay Street, 500 Francisco Street, San Francisco, San Francisco County, CA

  4. 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

  5. 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

  6. DETAIL VIEW OF EXTERIOR SIDE OF THE NORTH TRANSFER AISLE ...

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

    DETAIL VIEW OF EXTERIOR SIDE OF THE NORTH TRANSFER AISLE DOOR, FACING SOUTH - Cape Canaveral Air Force Station, Launch Complex 39, Vehicle Assembly Building, VAB Road, East of Kennedy Parkway North, Cape Canaveral, Brevard County, FL

  7. 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

  8. 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

  9. 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

  10. Symmetry in exterior boundary value problems for quasilinear

    E-print Network

    to a weak solution of the exterior p-capacitary problem, .... O ur approach combines several ideas based upon the maximum principle , a ... The scale invariance of the .... the diff erent nature of the boundary conditions in elliptic or parabolic ...

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

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

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

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

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

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

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

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

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

  14. Exterior, looking southwest Beale Air Force Base, Perimeter Acquisition ...

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

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

  15. Exterior, detail, showing spiral stair, looking northwest Beale Air ...

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

    Exterior, detail, showing spiral stair, looking northwest - Beale Air Force Base, Perimeter Acquisition Vehicle Entry Phased-Array Warning System, Guard Tower, End of Spencer Paul Road, north of Warren Shingle Road (14th Street), Marysville, Yuba County, CA

  16. Exterior, looking north Beale Air Force Base, Perimeter Acquisition ...

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

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

  17. 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

  18. 4. EXTERIOR VIEW TO THE NORTH OF THE WESTERN PORTION ...

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

    4. EXTERIOR VIEW TO THE NORTH OF THE WESTERN PORTION OF THE SOUTH ELEVATION OF THE TEST CELL. - Nevada Test Site, Test Cell C Facility, Building No. 3210, Area 25, Jackass Flats, Road J, Mercury, Nye County, NV

  19. 3. EXTERIOR VIEW TO THE SOUTHEAST OF THE NORTH AND ...

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

    3. EXTERIOR VIEW TO THE SOUTHEAST OF THE NORTH AND WEST ELEVATIONS OF THE TEST CELL. - Nevada Test Site, Test Cell C Facility, Building No. 3210, Area 25, Jackass Flats, Road J, Mercury, Nye County, NV

  20. 5. EXTERIOR VIEW TO THE WEST OF THE EAST ELEVATION ...

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

    5. EXTERIOR VIEW TO THE WEST OF THE EAST ELEVATION OF THE TEST CELL, WITH DEWARS IN THE BACKGROUND. - Nevada Test Site, Test Cell C Facility, Building No. 3210, Area 25, Jackass Flats, Road J, Mercury, Nye County, NV

  1. 6. EXTERIOR VIEW TO THE NORTHWEST OF THE SOUTHEAST CORNER ...

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

    6. EXTERIOR VIEW TO THE NORTHWEST OF THE SOUTHEAST CORNER OF THE EAST ELEVATION OF THE TEST CELL. - Nevada Test Site, Test Cell C Facility, Building No. 3210, Area 25, Jackass Flats, Road J, Mercury, Nye County, NV

  2. 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

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

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

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

  4. 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

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

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

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

  6. UNT OFFICE OF FACILITIES MANAGEMENT & CONSTRUCTION EXTERIOR ART INSTALLATION GUIDELINES

    E-print Network

    Mohanty, Saraju P.

    UNT OFFICE OF FACILITIES MANAGEMENT & CONSTRUCTION EXTERIOR ART INSTALLATION GUIDELINES Proposed locations for all art installations, temporary or permanent must first for installation. Ex: If you are installing nearest to the Art building, you would

  7. 21. EXTERIOR, PARTIAL VIEW OF THE EAST ELEVATION OF THE ...

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

    21. EXTERIOR, PARTIAL VIEW OF THE EAST ELEVATION OF THE SERVICE WING, WITHOUT SCALE - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

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

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

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

  9. 38. EXTERIOR, DETAIL VIEW OF CLERESTORY WINDOWS OF THIRD FLOOR, ...

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

    38. EXTERIOR, DETAIL VIEW OF CLERESTORY WINDOWS OF THIRD FLOOR, EAST ELEVATION - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  10. 23. EXTERIOR, VIEW OF THE PORTECOCHERE AND EAST ELEVATION FROM ...

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

    23. EXTERIOR, VIEW OF THE PORTE-COCHERE AND EAST ELEVATION FROM THE NORTH - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  11. 29. EXTERIOR, VERTICAL VIEW OF UMBRA, SOUTH TOWER, AND CONSERVATORY ...

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

    29. EXTERIOR, VERTICAL VIEW OF UMBRA, SOUTH TOWER, AND CONSERVATORY FROM THE SOUTHEAST - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  12. 20. EXTERIOR, PARTIAL VIEW OF THE EAST ELEVATION OF THE ...

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

    20. EXTERIOR, PARTIAL VIEW OF THE EAST ELEVATION OF THE SERVICE WING, WITH SCALE - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  13. 7. EXTERIOR, GENERAL VIEW OF NORTH (STREET SIDE) ELEVATION FROM ...

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

    7. EXTERIOR, GENERAL VIEW OF NORTH (STREET SIDE) ELEVATION FROM THE NORTH - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  14. 37. EXTERIOR, DETAIL VIEW OF GUTTERS AND DRAINAGE PIPES ON ...

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

    37. EXTERIOR, DETAIL VIEW OF GUTTERS AND DRAINAGE PIPES ON EAST ELEVATION FROM SOUTHEAST - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  15. 15. EXTERIOR, GENERAL VIEW OF WEST (REAR) ELEVATION AND PARTIAL ...

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

    15. EXTERIOR, GENERAL VIEW OF WEST (REAR) ELEVATION AND PARTIAL NORTH ELEVATION FROM THE NORTHWEST - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  16. 12. EXTERIOR, VIEW OF SOUTHEAST CORNER WITH EDGE OF CARRIAGE ...

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

    12. EXTERIOR, VIEW OF SOUTHEAST CORNER WITH EDGE OF CARRIAGE HOUSE ON LEFT - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  17. 14. EXTERIOR, VIEW OF SOUTH ELEVATION WITH PARTIAL VIEW OF ...

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

    14. EXTERIOR, VIEW OF SOUTH ELEVATION WITH PARTIAL VIEW OF EAST ELEVATION - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  18. 16. EXTERIOR, GENERAL VIEW OF WEST (REAR) ELEVATION FROM THE ...

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

    16. EXTERIOR, GENERAL VIEW OF WEST (REAR) ELEVATION FROM THE NORTHWEST - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  19. 11. EXTERIOR, PARTIAL VIEW OF EAST (FRONT) ELEVATION FROM THE ...

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

    11. EXTERIOR, PARTIAL VIEW OF EAST (FRONT) ELEVATION FROM THE SOUTHEAST - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  20. 10. EXTERIOR, VIEW OF THE SOUTHERN HALF OF THE EAST ...

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

    10. EXTERIOR, VIEW OF THE SOUTHERN HALF OF THE EAST (FRONT) ELEVATION - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  1. 25. EXTERIOR, EAST ELEVATION, VIEW OF THE FIRST FLOOR PORCH ...

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

    25. EXTERIOR, EAST ELEVATION, VIEW OF THE FIRST FLOOR PORCH AND PORTE-COCHERE FROM THE SOUTHEAST - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  2. 26. EXTERIOR, EAST ELEVATION, VIEW NORTH FROM PORCH DECK TO ...

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

    26. EXTERIOR, EAST ELEVATION, VIEW NORTH FROM PORCH DECK TO THE PORTE-COCHERE FROM THE SOUTH - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  3. 24. EXTERIOR, DETAIL VIEW OF THE EAST ELEVATION OF THE ...

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

    24. EXTERIOR, DETAIL VIEW OF THE EAST ELEVATION OF THE PORTE-COCHERE - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  4. 39. EXTERIOR, DETAIL VIEW OF SECOND FLOOR WINDOW AND DORMER ...

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

    39. EXTERIOR, DETAIL VIEW OF SECOND FLOOR WINDOW AND DORMER ROOF ON THE EAST SIDE OF THE SOUTH ELEVATION FROM THE SOUTH - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  5. 27. EXTERIOR, DETAIL VIEW OF THE WINDSCREEN ON THE NORTH ...

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

    27. EXTERIOR, DETAIL VIEW OF THE WIND-SCREEN ON THE NORTH WALL OF THE PORTE-COCHERE - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  6. 36. EXTERIOR, DETAIL VIEW OF GABLE WITH CHIMNEY IN BACKGROUND ...

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

    36. EXTERIOR, DETAIL VIEW OF GABLE WITH CHIMNEY IN BACKGROUND FROM THE SOUTHEAST - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  7. 31. EXTERIOR, DETAIL VIEW ALONG WEST ELEVATION OF THE UMBRA ...

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

    31. EXTERIOR, DETAIL VIEW ALONG WEST ELEVATION OF THE UMBRA TO A FIRST FLOOR WINDOW ON THE SOUTH ELEVATION - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

  8. 1. EXTERIOR FROM THE SOUTHEAST (view taken 1887; from Title ...

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

    1. EXTERIOR FROM THE SOUTHEAST (view taken 1887; from Title Insurance Company Collection, San Diego Historical Society. Photocopy by Bert Shankland, San Diego, August 20, 1976). - Grand Hotel, 332 F Street, San Diego, San Diego County, CA

  9. 6. Historic American Buildings Survey EXTERIOR SUMMERGARDEN, SHOWING EAST ELEVATION ...

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

    6. Historic American Buildings Survey EXTERIOR SUMMERGARDEN, SHOWING EAST ELEVATION OF 1893-94 PORTION OF BUILDING, PHOTOCOPY c. 1898 - Das Deutsche Haus, 401 East Michigan Street, Indianapolis, Marion County, IN

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

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

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

  11. 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

  12. 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

  13. 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

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

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

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

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

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

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

  16. 1. EXTERIOR VIEW, LOOKING NORTHWEST, WITH FRONT (MAIN STREET) FACADE ...

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

    1. EXTERIOR VIEW, LOOKING NORTHWEST, WITH FRONT (MAIN STREET) FACADE OF THIS 1850S COURTHOUSE WHICH NOW SERVES AS A COUNTY ARCHIVES AND MUSEUM - Old Shelby County Courthouse, North Main Street, Columbiana, Shelby County, AL

  17. 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

  18. 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  4. 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

  5. 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

  6. 2. EXTERIOR VIEW OF THE REAR AND SOUTH SIDE OF ...

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

    2. EXTERIOR VIEW OF THE REAR AND SOUTH SIDE OF BUILDING 676 FACING NORTHEAST. - U.S. Naval Base, Pearl Harbor, Applied Instruction Building, Corner of Morton & Moore Streets, Pearl City, Honolulu County, HI

  7. 3. EXTERIOR VIEW OF THE REAR AND NORTH SIDE OF ...

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

    3. EXTERIOR VIEW OF THE REAR AND NORTH SIDE OF BUILDING 676 FACING SOUTHEAST. - U.S. Naval Base, Pearl Harbor, Applied Instruction Building, Corner of Morton & Moore Streets, Pearl City, Honolulu County, HI

  8. 1. EXTERIOR VIEW OF THE FRONT AND SOUTH SIDE OF ...

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

    1. EXTERIOR VIEW OF THE FRONT AND SOUTH SIDE OF BUILDING 676 FACING NORTHWEST. - U.S. Naval Base, Pearl Harbor, Applied Instruction Building, Corner of Morton & Moore Streets, Pearl City, Honolulu County, HI

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

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

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

  10. 1. EXTERIOR OF CIVIL ENGINEERING MAINTENANCE SHOP, BUILDING 103, LOOKING ...

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

    1. EXTERIOR OF CIVIL ENGINEERING MAINTENANCE SHOP, BUILDING 103, LOOKING NORTH. - Mill Valley Air Force Station, Civil Engineering Maintenance Shop, East Ridgecrest Boulevard, Mount Tamalpais, Mill Valley, Marin County, CA

  11. 4. DETAIL ALONG WEST SIDE, SHOWING EXTERIOR STAIRWAY, BUILDING NO. ...

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

    4. DETAIL ALONG WEST SIDE, SHOWING EXTERIOR STAIRWAY, BUILDING NO. 1 IN THE CENTER DISTANCE, AND ONE OF THE BENDING SHOPS AT RIGHT. - United Engineering Company Shipyard, Engineering Building, 2900 Main Street, Alameda, Alameda County, CA

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

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

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

  13. 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

  14. 5. EXTERIOR OF NORTH END OF BUILDING 105 SHOWING 1946 ...

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

    5. EXTERIOR OF NORTH END OF BUILDING 105 SHOWING 1946 BEDROOM ADDITION. BUILDING 108 IS VISIBLE AT EXTREME PHOTO LEFT. VIEW TO SOUTHEAST. - Rush Creek Hydroelectric System, Worker Cottage, Rush Creek, June Lake, Mono County, CA

  15. 4. EXTERIOR VIEW LOOKING EAST. WATER IN THE AQUEDUCT CAN ...

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

    4. EXTERIOR VIEW LOOKING EAST. WATER IN THE AQUEDUCT CAN CAN BE DIVERTED AT THE WASTE WEIR TO BE DISCHARGED INTO THE CULVERT IN FOREGROUND. - Old Croton Aqueduct, Northern Waste Weir, Snowden Avenue & Van Wick Street, Ossining, Westchester County, NY

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

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

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

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

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

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

  18. 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

  19. 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

  20. 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

  1. 3. EXTERIOR SOUTH ELEVATION VIEW OF THE ADMINISTRATION BUILDING 202, ...

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

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

  2. 4. EXTERIOR OBLIQUE VIEW OF THE ADMINISTRATION BUILDING, LOOKING EASTNORTHEAST. ...

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

    4. EXTERIOR OBLIQUE VIEW OF THE ADMINISTRATION BUILDING, LOOKING EAST-NORTHEAST. - Mill Valley Air Force Station, Administration Building, East Ridgecrest Boulevard, Mount Tamalpais, Mill Valley, Marin County, CA

  3. OBLIQUE VIEW. NOTE THE ROUGHSURFACED EXTERIOR OF THE CONCRETE WALLS. ...

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

    OBLIQUE VIEW. NOTE THE ROUGH-SURFACED EXTERIOR OF THE CONCRETE WALLS. VIEW FACING NORTHEAST - U.S. Naval Base, Pearl Harbor, Ford Island 5-Inch Antiaircraft Battery, Battery Command Center, Ford Island, Pearl City, Honolulu County, HI

  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. 1. EXTERIOR VIEW OF THE REMAINS OF BUILDING 302, THE ...

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

    1. EXTERIOR VIEW OF THE REMAINS OF BUILDING 302, THE MILL VALLEY AIR FORCES STATION GUARDHOUSE, LOOKING EAST. - Mill Valley Air Force Station, Gatehouse, East Ridgecrest Boulevard, Mount Tamalpais, Mill Valley, Marin County, CA

  6. 27. Detail of north exterior wall of taproom showing typical ...

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

    27. Detail of north exterior wall of taproom showing typical window inset in adobe wall and brackets supporting stringer and rafters. - Fort Ord, Soldiers' Club, California State Highway 1 near Eighth Street, Seaside, Monterey County, CA

  7. Planetary Rings

    NASA Astrophysics Data System (ADS)

    Tiscareno, Matthew S.

    Planetary rings are the only nearby astrophysical disks and the only disks that have been investigated by spacecraft (especially the Cassini spacecraft orbiting Saturn). Although there are significant differences between rings and other disks, chiefly the large planet/ring mass ratio that greatly enhances the flatness of rings (aspect ratios as small as 10- 7), understanding of disks in general can be enhanced by understanding the dynamical processes observed at close range and in real time in planetary rings.We review the known ring systems of the four giant planets, as well as the prospects for ring systems yet to be discovered. We then review planetary rings by type. The A, B, and C rings of Saturn, plus the Cassini Division, comprise our solar system's only dense broad disk and host many phenomena of general application to disks including spiral waves, gap formation, self-gravity wakes, viscous overstability and normal modes, impact clouds, and orbital evolution of embedded moons. Dense narrow rings are found both at Uranus (where they comprise the main rings entirely) and at Saturn (where they are embedded in the broad disk) and are the primary natural laboratory for understanding shepherding and self-stability. Narrow dusty rings, likely generated by embedded source bodies, are surprisingly found to sport azimuthally confined arcs at Neptune, Saturn, and Jupiter. Finally, every known ring system includes a substantial component of diffuse dusty rings.Planetary rings have shown themselves to be useful as detectors of planetary processes around them, including the planetary magnetic field and interplanetary impactors as well as the gravity of nearby perturbing moons. Experimental rings science has made great progress in recent decades, especially numerical simulations of self-gravity wakes and other processes but also laboratory investigations of coefficient of restitution and spectroscopic ground truth. The age of self-sustained ring systems is a matter of debate; formation scenarios are most plausible in the context of the early solar system, while signs of youthfulness indicate at least that rings have never been static phenomena.

  8. Vortex rings

    NASA Technical Reports Server (NTRS)

    Shariff, Karim; Leonard, Anthony

    1992-01-01

    The vortex-ring problem in fluid mechanics is examined generally in terms of formation, the steady state, the duration of the rings, and vortex interactions. The formation is studied by examining the generation of laminar and turbulent vortex rings and their resulting structures with attention given to the three stages of laminar ring development. Inviscid dynamics is addressed to show how core dynamics affects overall ring motion, and laminar vortex structures are described in two dimensions. Viscous and inviscid structures are related in terms of 'leapfrogging', head-on collisions, and collisions with a no-slip wall. Linear instability theory is shown to successfully describe observational data, although late stages in the breakdown are not completely understood. This study of vortex rings has important implications for key aerodynamic issues including sound generation, transport and mixing, and vortex interactions.

  9. Contraceptive Ring

    Microsoft Academic Search

    Susan A. Ballagh

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

  10. Identification of convective heat loss on exterior cavity wall assemblies

    NASA Astrophysics Data System (ADS)

    Colantonio, Antonio

    1999-03-01

    Most present day low and medium rise buildings constructed in Canada use some form of cavity wall design for their exterior walls. These types of wall assemblies use a broad range of cladding materials such as brick, stone, wood, sheet metal, porcelain enamel or metal panels, cementitious materials and plastics. The interior assemblies of these walls include the air barrier, vapor barrier and insulation layers. The cladding is separated from the interior wall assembly by an air space of varying thickness. Dependent upon the temperature differential between the interior and exterior, the temperature between the outer surface of the interior wall assembly and the inner surface of the exterior cladding under conditions in which air movement is restricted will give rise to convective heat loss mechanisms. This paper will look at how these convective heat loss patterns manifest themselves as thermal patterns on exterior surfaces of cladding materials. Similar details will be illustrated under various pressure differential conditions through the entire building envelope assembly. Various types of exterior wall assemblies will be discussed.

  11. 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

  12. Ring Detectives

    NSDL National Science Digital Library

    This lesson will help students understand what Gulf Stream rings are and why are they significant. Students will describe the overall flow of the Gulf Stream, explain how it affects biological communities in the North Atlantic Ocean, and describe Gulf Stream rings and how they are formed. They will also compare and contrast warm-core rings and cold-core rings and explain how Gulf Stream rings may affect biological communities on the edge and slope of the continental shelf adjacent to the coasts of North and South Carolina. This hands-on activity uses online data resources and includes: focus questions, learning objectives, teaching time, background information, learning procedures, extensions, and resources and student handouts.

  13. Numerical conformal mapping methods for exterior regions with corners

    SciTech Connect

    DeLillo, T.K.; Elcrat, A.R. (Wichita State Univ., KS (United States))

    1993-10-01

    The main purpose of this paper is to present a method for computing the conformal map between the exterior of the unit disk and the exterior of a simple closed curve with corners. The method may be regarded as a generalization of the Schwarz-Christoffel transformation and is derived from the integral equation of Timman. Some comparison is made with other methods such as a version of Timman's equation with corners, Fornberg's method with explicit corner removers, Davis' method, and CONFPACK. The method proves to be quite flexible and robust. 22 refs., 19 figs., 2 tabs.

  14. Numerical conformal mapping methods for exterior and doubly connected regions

    SciTech Connect

    DeLillo, T.K. [Wichita State Univ., KS (United States); Pfaltzgraff, J.A. [Univ. of North Carolina, Chapel Hill, NC (United States)

    1996-12-31

    Methods are presented and analyzed for approximating the conformal map from the exterior of the disk to the exterior a smooth, simple closed curve and from an annulus to a bounded, doubly connected region with smooth boundaries. The methods are Newton-like methods for computing the boundary correspondences and conformal moduli similar to Fornberg`s method for the interior of the disk. We show that the linear systems are discretizations of the identity plus a compact operator and, hence, that the conjugate gradient method converges superlinearly.

  15. The generalization of the exterior square of a Bieberbach group

    NASA Astrophysics Data System (ADS)

    Masri, Rohaidah; Hassim, Hazzirah Izzati Mat; Sarmin, Nor Haniza; Ali, Nor Muhainiah Mohd; Idrus, Nor'ashiqin Mohd

    2014-06-01

    The exterior square of a group is one of the homological functors which were originated in the homotopy theory. Meanwhile, a Bieberbach group is a torsion free crystallographic group. A Bieberbach group with cyclic point group of order two, C2, of dimension n can be defined as the direct product of that group of the smallest dimension with a free abelian group. Using the group presentation and commutator generating sequence, the exterior square of a Bieberbach group with point group C2 of dimension n is computed.

  16. EXTERIOR VIEW, FRONT (NORTH) ELEVATION. THIS THREESTORY BRICK BUILDING WITH ...

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

    EXTERIOR VIEW, FRONT (NORTH) ELEVATION. THIS THREE-STORY BRICK BUILDING WITH DEEPLY-BRACKETED AND OVERHANGING EAVES INCLUDES MULTIPLE BAYS CONSTRUCTED BEGINNING IN 1913 TO SERVE AS A 'CIVIC CENTER' FOR ACIPCO EMPLOYEES AND THEIR FAMILIES. THE BUILDING CURRENTLY INCLUDES THE TIME OFFICE, CAFETERIA, AND AUDITORIUM. - American Cast Iron Pipe Company, Service Building, 1501 Thirty-first Avenue North, Birmingham, Jefferson County, AL

  17. Exterior oblique detail view of sidewalk entry at north side ...

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

    Exterior oblique detail view of sidewalk entry at north side of Building 3 from Bay Street sidewalk, looking southeast (with original steps revised to accommodate handicap ramp) - North Beach Place, 475 Bay Street, 475 Bay Street, San Francisco, San Francisco County, CA

  18. Exterior oblique view of the west side of Building 9 ...

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

    Exterior oblique view of the west side of Building 9 from across Taylor Street (at Bay Street and Taylor Street, cable-car turnaround), looking southeast - North Beach Place, 491 Bay Street, 590 Francisco Street, 491 Bay Street, 590 Francisco Street, San Francisco, San Francisco County, CA

  19. 2. Exterior view of instrumentation and gauge panels on southeast ...

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

    2. Exterior view of instrumentation and gauge panels on southeast wall of Signal Transfer Building (T-28A). The piping and tubing visibile in the photograph extends from the structure to the Systems Integration Laboratory Building (T-28) and other structures in the complex. - Air Force Plant PJKS, Systems Integration Laboratory, Signal Transfer Building, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

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

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

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

  1. 10. Exterior view, showing the structural details and tanks above ...

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

    10. Exterior view, showing the structural details and tanks above at walk-in entry level (bottom) of Test Cell 7, Systems Integration Laboratory Building (T-28), looking west. - Air Force Plant PJKS, Systems Integration Laboratory, Systems Integration Laboratory Building, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

  2. 8. Exterior view, showing tank and associated piping adjacent to ...

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

    8. Exterior view, showing tank and associated piping adjacent to Test Cell 6, Systems Integration Laboratory Building (T-28), looking south. - Air Force Plant PJKS, Systems Integration Laboratory, Systems Integration Laboratory Building, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

  3. 7. Exterior view, showing instrumentation and gauge panel at the ...

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

    7. Exterior view, showing instrumentation and gauge panel at the walk-in entry level (bottom) of Test Cell 6, Systems Integration Laboratory Building (T-28), looking west. - Air Force Plant PJKS, Systems Integration Laboratory, Systems Integration Laboratory Building, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

  4. 6. Exterior view, showing structural details and instrumentation at the ...

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

    6. Exterior view, showing structural details and instrumentation at the walk-in entry level (bottom) of Test Cell 6, Systems Integration Laboratory Building (T-28), looking southwest. - Air Force Plant PJKS, Systems Integration Laboratory, Systems Integration Laboratory Building, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

  5. 9. Exterior view, Test Cell 7, Systems Integration Laboratory Building ...

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

    9. Exterior view, Test Cell 7, Systems Integration Laboratory Building (T-28), looking southwest. The enclosure discussed in CO-88-B-8 is at the right. - Air Force Plant PJKS, Systems Integration Laboratory, Systems Integration Laboratory Building, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

  6. 12. Exterior view, showing tank and piping associated with Test ...

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

    12. Exterior view, showing tank and piping associated with Test Cell 7, Systems Integration Laboratory Building (T-28), looking west. - Air Force Plant PJKS, Systems Integration Laboratory, Systems Integration Laboratory Building, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

  7. 7. EXTERIOR DETAIL OF FRONT DOOR ON CASHBAUGH PERIOD PORTION ...

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

    7. EXTERIOR DETAIL OF FRONT DOOR ON CASHBAUGH PERIOD PORTION OF HOUSE SHOWING PEDIMENTED LINTEL. DOOR TO BEDROOM NO. 1 ON SAME WALL AT PHOTO RIGHT. VIEW TO NORTHEAST. - Bishop Creek Hydroelectric System, Plant 6, Cashbaugh-Kilpatrick House, Bishop Creek, Bishop, Inyo County, CA

  8. Close view along the Fourteenth Street facade; the exterior wall ...

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

    Close view along the Fourteenth Street facade; the exterior wall of the building is recessed several feet behind the colonnade of twenty-four Doric columns - United States Department of Commerce, Bounded by Fourteenth, Fifteenth, and E streets and Constitution Avenue, Washington, District of Columbia, DC

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

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

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

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

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

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

  11. 2. EXTERIOR VIEW OF DOWNSTREAM SIDE OF COTTAGE 191 TAKEN ...

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

    2. EXTERIOR VIEW OF DOWNSTREAM SIDE OF COTTAGE 191 TAKEN FROM ROOF OF GARAGE 393. CAMERA FACING SOUTHEAST. COTTAGE 181 AND CHILDREN'S PLAY AREA VISIBLE ON EITHER SIDE OF ROOF. GRAPE ARBOR IN FOREGROUND. - Swan Falls Village, Cottage 191, Snake River, Kuna, Ada County, ID

  12. 26. GENERAL EXTERIOR VIEW LOOKING EAST, SHOWING FISH LADDER ON ...

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

    26. GENERAL EXTERIOR VIEW LOOKING EAST, SHOWING FISH LADDER ON WASHINGTON SHORE ADJACENT TO UPSTREAM FACE OF THE DAM/SPILLWAY. Photograph Nos. OR-11-F-27 through OR-11-F-94 are photocopies of photographs. Original historic photographs are located at the Bonneville Powerhouse, Bonneville, Oregon. - Bonneville Project, Bonneville Dam, Columbia River, Bonneville, Multnomah County, OR

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

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

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

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

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

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

  15. 2. EXTERIOR VIEW, LOOKING NORTHEAST FROM THE CUPOLA (RIGHT) TO ...

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

    2. EXTERIOR VIEW, LOOKING NORTHEAST FROM THE CUPOLA (RIGHT) TO COKE BIN (LEFT), OF RAW MATERIALS YARD. FOUNDRY IRON IS FROM SCRAP, NOT BASIC ORE. RAW MATERIALS ASSEMBLED, IN PILES, FOR SMELTING ARE AUTOMOTIVE SCRAP (CENTER), STRUCTURAL STEEL AND RAILROAD RAIL (RIGHT) AND LIMESTONE (LEFT). - Stockham Pipe & Fittings Company, Grey Iron Foundry, 4000 Tenth Avenue North, Birmingham, Jefferson County, AL

  16. EXTERIOR VIEW, LOOKING EAST, OF REDUCTION PLANT NO. 6 WITH ...

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

    EXTERIOR VIEW, LOOKING EAST, OF REDUCTION PLANT NO. 6 WITH PRIMARY AND SECONDARY LIMESTONE REDUCTION ('CRUSHING') IN PROGRESS AND A FRONT END LOADER (CONFIRM NAME OF VEHICLE?). - Wade Sand & Gravel Company, Reduction Plant No. 6, State Route 78, Thomas, Jefferson County, AL

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

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

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

  18. Exterior oblique view of northeast and southeast sides with heavy ...

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

    Exterior oblique view of northeast and southeast sides with heavy weight sliding doors, louvered entry door, view facing west - U.S. Naval Base, Pearl Harbor, Industrial X-Ray Building, Off Sixth Street, adjacent to and south of Facility No. 11, Pearl City, Honolulu County, HI

  19. View of north side from exterior stairs of adjacent building, ...

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

    View of north side from exterior stairs of adjacent building, bottom cut off by fringed buildings, view facing south-southwest - U.S. Naval Base, Pearl Harbor, Industrial X-Ray Building, Off Sixth Street, adjacent to and south of Facility No. 11, Pearl City, Honolulu County, HI

  20. EXTERIOR VIEW, LOOKING WEST, AT FORMER TCIUS STEEL COMPANY BEE ...

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

    EXTERIOR VIEW, LOOKING WEST, AT FORMER TCI-US STEEL COMPANY BEE HIVE OVEN RUINS WITH FORESTED OVERGROWTH. - Pratt Coal & Coke Company, Pratt Mines, Coke Ovens & Railroad, Bounded by First Street, Avenue G, Third Place, Birmingham Southern Railroad, Birmingham, Jefferson County, AL

  1. RIVER VIEW FROM EXTERIOR LOCK WALL SHOWING DAM GATE, MANEUVER ...

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

    RIVER VIEW FROM EXTERIOR LOCK WALL SHOWING DAM GATE, MANEUVER BOAT No. 1, AND DAM. LOOKING NORTH NORTHEAST. - Illinois Waterway, La Grange Lock and Dam, 3/4 mile south of Country 795N at Illinois River, Versailles, Brown County, IL

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

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

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

  3. 9. EXTERIOR VIEW OF FRONT ENTRANCE TO BUNKER. CAMERA FACING ...

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

    9. EXTERIOR VIEW OF FRONT ENTRANCE TO BUNKER. CAMERA FACING EAST. TANK COVER AND FRAME TO THE REAR OF VIEW. INEL PHOTO NUMBER 65-6170, TAKEN NOVEMBER 10, 1965. - Idaho National Engineering Laboratory, Advanced Reentry Vehicle Fusing System, Scoville, Butte County, ID

  4. 6. CONSTRUCTION PROGRESS VIEW (EXTERIOR) OF TANK, CABLE CHASE, AND ...

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

    6. CONSTRUCTION PROGRESS VIEW (EXTERIOR) OF TANK, CABLE CHASE, AND MOUNDED BUNKER. CONSTRUCTION WAS 99 PERCENT COMPLETE. CAMERA IS FACING WEST. INEL PHOTO NUMBER 65-5435, TAKEN OCTOBER 20, 1965. - Idaho National Engineering Laboratory, Advanced Reentry Vehicle Fusing System, Scoville, Butte County, ID

  5. 8. CONSTRUCTION PROGRESS EXTERIOR VIEW OF NEARLYCOMPLETED FACILITY. SHOWS COVER ...

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

    8. CONSTRUCTION PROGRESS EXTERIOR VIEW OF NEARLY-COMPLETED FACILITY. SHOWS COVER OVER SHIELDING TANK, FRAMEWORK ASSEMBLY WITH GUY WIRES, FENCE AROUND TANK AREA, DANGER SIGNS, AND MOUNDED BUNKER IN BACKGROUND. INEL PHOTO NUMBER 65-5442, TAKEN OCTOBER 20, 1965. - Idaho National Engineering Laboratory, Advanced Reentry Vehicle Fusing System, Scoville, Butte County, ID

  6. 10. EXTERIOR VIEW OF ARVFS TEST FACILITY SHOWING BUNKER, CABLE ...

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

    10. EXTERIOR VIEW OF ARVFS TEST FACILITY SHOWING BUNKER, CABLE CHASE, FRAME, AND SHIELDING TANK. CAMERA FACING NORTHEAST. INEL PHOTO NUMBER 65-6171, TAKEN NOVEMBER 10, 1965. - Idaho National Engineering Laboratory, Advanced Reentry Vehicle Fusing System, Scoville, Butte County, ID

  7. EXTERIOR, A view looking northwest captures the south side of ...

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

    EXTERIOR, A view looking northwest captures the south side of the building. The grassy knoll in the left foreground was where an explosives bunker was located before its demolition - Department of Energy, Mound Facility, Isolated Building (I Building), One Mound Road, Miamisburg, Montgomery County, OH

  8. Exterior oblique view of west side of Building 6 from ...

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

    Exterior oblique view of west side of Building 6 from the 2nd floor balcony of Building 7, looking southeast - North Beach Place, 401 Bay Street, 500 Francisco Street, 401 Bay Street, 500 Francisco Street, San Francisco, San Francisco County, CA

  9. Exterior oblique view of east side of Building 6 from ...

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

    Exterior oblique view of east side of Building 6 from across Mason Street (at corner of Francisco Street) looking northwest - North Beach Place, 401 Bay Street, 500 Francisco Street, 401 Bay Street, 500 Francisco Street, San Francisco, San Francisco County, CA

  10. EXTERIOR VIEW, LOOKING SOUTHEAST, WITH FRONT FACADE AND PORCH. FREE ...

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

    EXTERIOR VIEW, LOOKING SOUTHEAST, WITH FRONT FACADE AND PORCH. FREE STANDING BRICK GABLED ROOF SHOWS EVIDENCE OF RECENT FIRE WHICH PARTIALLY DESTROYED THE PROPERTY WHICH WAS BUILT IN THE 1840S FOR THE THEN IRON MASTER HORACE WARE. - Shelby Iron Works, Iron Master's House, County Road 42, Shelby, Shelby County, AL

  11. 29. Photograph of four historic views of exterior of Bowditch ...

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

    29. Photograph of four historic views of exterior of Bowditch Hall, c. 1950, taken from album in building photo files in Caretaker Site Office, Naval Undersea Warfare Center, New London. Copyright-free. - 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

  12. EXTERIOR PERSPECTIVE OF HOUSE AND MILKROOM LOOKING SOUTHEAST FROM GARAGE ...

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

    EXTERIOR PERSPECTIVE OF HOUSE AND MILKROOM LOOKING SOUTHEAST FROM GARAGE (This image shows the gable-roofed punch out entrance into the kitchen that was added in the mid-1980s when the kitchen was remodeled. Penn Cove can be seen in the distance) - Arnold Farm, House, 1948 Arnold Road, Coupeville, Island County, WA

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

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

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

  14. Exterior, looking southeast from within compound towards Main Gate, Gate ...

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

    Exterior, looking southeast from within compound towards Main Gate, Gate House center left - Beale Air Force Base, Perimeter Acquisition Vehicle Entry Phased-Array Warning System, Gate House, End of Spencer Paul Road, north of Warren Shingle Road (14th Street), Marysville, Yuba County, CA

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

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

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

  16. 5. Exterior detail of connector and boiler room (Constructed after ...

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

    5. Exterior detail of connector and boiler room (Constructed after 1953); Connector links east wing (Known as A-130 prior to 1953) & west wing (Known as A-129 prior to 1953) - Advance Base Depot, Davisville, Building A-130, Northeast section of Advance Base Depot, adjacent to Pier No. 1, Davisville, Washington County, RI

  17. 35. EXTERIOR, VIEW OF QUARTERROUND ENCLOSURE AND ENTRANCE TO THE ...

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

    35. EXTERIOR, VIEW OF QUARTER-ROUND ENCLOSURE AND ENTRANCE TO THE BUTLER'S PANTRY ON THE WEST (REAR) ELEVATION FROM THE SOUTH, WITHOUT SCALE - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

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

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

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

  19. 34. EXTERIOR, VIEW OF QUARTERROUND ENCLOSURE AND ENTRANCE TO THE ...

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

    34. EXTERIOR, VIEW OF QUARTER-ROUND ENCLOSURE AND ENTRANCE TO THE BUTLER'S PANTRY ON THE WEST (REAR) ELEVATION FROM THE SOUTH, WITH SCALE - Mark Twain House, 351 Farmington Avenue (corrected from original address of 531 Farmington Avenue), Hartford, Hartford County, CT

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

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

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

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

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

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

  2. 6. VIEW OF BUILDING 371 EXTERIOR WALL CONSTRUCTION DETAIL. BUILDING ...

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

    6. VIEW OF BUILDING 371 EXTERIOR WALL CONSTRUCTION DETAIL. BUILDING CONSTRUCTION WAS HARDENED TO WITHSTAND THE FORCES IMPOSED BY A DESIGN-BASIS EARTHQUAKE OR TORNADO. (7/1/74) - Rocky Flats Plant, Plutonium Recovery Facility, Northwest portion of Rocky Flats Plant, Golden, Jefferson County, CO

  3. 4. EXTERIOR OF SOUTH END OF BUILDING 105 SHOWING TALL ...

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

    4. EXTERIOR OF SOUTH END OF BUILDING 105 SHOWING TALL RUSTIC STYLE CHIMNEY WITH GABLE FRAME, METAL ROOF, AND CONCRETE WALKWAY AND STEP TO OPEN SIDE-ENTRY DOOR AT PHOTO ENTER. ORIGINAL DECORATIVE WOOD SHIPLAP SIDING ON UPPER END GABLE HAS BEEN COVERED WITH ASPHALT SHINGLES. VIEW TO NORTH. - Rush Creek Hydroelectric System, Worker Cottage, Rush Creek, June Lake, Mono County, CA

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

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

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

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

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

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

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

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

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

  7. OFFICE WORKER PREFERENCES OF EXTERIOR SHADING DEVICES: A PILOT STUDY

    Microsoft Academic Search

    Helena Bülow-Hübe

    Solar shading devices are commonly used in offices to reduce cooling loads and glare from windows, but they also affect daylighting and the view to the outside. In this study, the function and op- eration of an awning and an exterior venetian blind as well as their influence on the view out was assessed by fifty office workers. The preferred

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

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

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

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

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

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

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

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

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

  11. Identification of convective heat loss on exterior cavity wall assemblies

    Microsoft Academic Search

    Antonio Colantonio

    1999-01-01

    Most present day low and medium rise buildings constructed in Canada use some form of cavity wall design for their exterior walls. These types of wall assemblies use a broad range of cladding materials such as brick, stone, wood, sheet metal, porcelain enamel or metal panels, cementitious materials and plastics. The interior assemblies of these walls include the air barrier,

  12. 21. DETAIL EXTERIOR VIEW OF TWOSTORY OFFICE AT NORTH CORNER ...

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

    21. DETAIL EXTERIOR VIEW OF TWO-STORY OFFICE AT NORTH CORNER OF BUILDING, SHOWING STAIRWAY, SASH WINDOWS, AND TYPICAL COLUMN WITH ROUND CONCRETE BASE - Oakland Army Base, Transit Shed, East of Dunkirk Street & South of Burma Road, Oakland, Alameda County, CA

  13. Solution of exterior problem using ellipsoidal artificial boundary

    Microsoft Academic Search

    Hongying Huang; Dongjie Liu; Dehao Yu

    2009-01-01

    In this paper, we present a general ellipsoidal artificial boundary method for three-dimensional exterior problem. The exact artificial boundary condition, which is expressed explicitly by the series concerning the ellipsoidal harmonic functions, is derived and then an equivalent problem in a bounded domain is presented. The error estimates show that the convergence rate depends on the mesh parameter, the number

  14. 2. EXTERIOR, CORNER VIEW OF (LEFT TO RIGHT) NIELSEN, GEHRKE ...

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

    2. EXTERIOR, CORNER VIEW OF (LEFT TO RIGHT) NIELSEN, GEHRKE AND HANSEN CLOTHING STORE (NORTH FRONT AND EAST SIDE), GARTON BAKERY AND CONFECTIONERY (NORTH FRONT) AND C.F. WHEELER BAKERY (NORTH FRONT) - East Locust Street Commercial District, 521-529 East Locust Street, Des Moines, Polk County, IA

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

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

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

  16. 7. HOUSE SOUTH SIDE EXTERIOR SHOWING ENCLOSED SLEEPING PORCH AND ...

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

    7. HOUSE SOUTH SIDE EXTERIOR SHOWING ENCLOSED SLEEPING PORCH AND CASEMENT WINDOW INTO ATTIC AT PEAK OF GABLE. VIEW TO NORTH. - Big Creek Hydroelectric System, Big Creek Town, Operator House, Orchard Avenue south of Huntington Lake Road, Big Creek, Fresno County, CA

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

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

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

  18. 4. Exterior view, looking west, showing east facade and relationship ...

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

    4. Exterior view, looking west, showing east facade and relationship of building to Little Mystic Channel. - Charlestown Navy Yard, Incinerator, Midway along northern boundary of Charlestown Navy Yard, on Little Mystic Channel, near junction of Eighteenth Street & Second Avenue, Boston, Suffolk County, MA

  19. 1. EXTERIOR OVERVIEW SHOWING FRONT (EAST) END AND SOUTH SIDE ...

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

    1. EXTERIOR OVERVIEW SHOWING FRONT (EAST) END AND SOUTH SIDE OF BUILDING 103, ROCK WALL AND MATURE COTTONWOOD TREES IN FOREGROUND, CONTROL SUBSTATION BEHIND BUILDING 103, AND BUILDING 106 BEHIND THE COTTONWOOD TREE IN THE NORTH BACKGROUND. VIEW TO NORTH. - Bishop Creek Hydroelectric System, Control Station, Worker Cottage, Bishop Creek, Bishop, Inyo County, CA

  20. EXTERIOR VIEW, RIGHT SIDE OF LOCOMOTIVE SHOWING WHEEL ASSEMBLY WITH ...

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

    EXTERIOR VIEW, RIGHT SIDE OF LOCOMOTIVE SHOWING WHEEL ASSEMBLY WITH BIG END OF MAIN ROD (TOP), ECCENTRIC CRANK (CENTER), AND BIG END CONCENTRIC ROD (BOTTOM). - Norfolk & Southern Steam Locomotive No. 611, Norris Yards, East of Ruffner Road, Irondale, Jefferson County, AL

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

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

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

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

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

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

  3. 6. Historic American Buildings Survey COPY OF EXTERIOR PHOTO PUBLISHED ...

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

    6. Historic American Buildings Survey COPY OF EXTERIOR PHOTO PUBLISHED IN HIGGINSON, MARY THATCHER, THOMAS WENTWORTH HIGGINSON, THE STORY OF HIS LIFE (BOSTON AND NEW YORK, 1914), OPP. p. 30. Gift of Cambridge Historical Commission - Stephen Higginson Jr. House, 7 Kirkland Street, Cambridge, Middlesex County, MA

  4. Exterior oblique view of east end and south side, Facility ...

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

    Exterior oblique view of east end and south side, Facility No. 47 to the left and Avenue G in foreground - U.S. Naval Base, Pearl Harbor, Casualty Station Type A, Corner of Avenue G & Sixth Street, near Dry Dock No. 1, Pearl City, Honolulu County, HI

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

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

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

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

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

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

  7. 46 CFR 32.56-20 - Insulation of exterior boundaries: Superstructures and deckhouses-T/ALL.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... Shipping 1 2012-10-01 2012-10-01 false Insulation of exterior boundaries: Superstructures and deckhouses-T...Laying Date On or After January 1, 1975 § 32.56-20 Insulation of exterior boundaries: Superstructures and...

  8. 46 CFR 32.56-20 - Insulation of exterior boundaries: Superstructures and deckhouses-T/ALL.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ... Shipping 1 2010-10-01 2010-10-01 false Insulation of exterior boundaries: Superstructures and deckhouses-T...Laying Date On or After January 1, 1975 § 32.56-20 Insulation of exterior boundaries: Superstructures and...

  9. 46 CFR 32.56-20 - Insulation of exterior boundaries: Superstructures and deckhouses-T/ALL.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ... Shipping 1 2013-10-01 2013-10-01 false Insulation of exterior boundaries: Superstructures and deckhouses-T...Laying Date On or After January 1, 1975 § 32.56-20 Insulation of exterior boundaries: Superstructures and...

  10. 46 CFR 32.56-20 - Insulation of exterior boundaries: Superstructures and deckhouses-T/ALL.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... Shipping 1 2014-10-01 2014-10-01 false Insulation of exterior boundaries: Superstructures and deckhouses-T...Laying Date On or After January 1, 1975 § 32.56-20 Insulation of exterior boundaries: Superstructures and...

  11. 46 CFR 32.56-20 - Insulation of exterior boundaries: Superstructures and deckhouses-T/ALL.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... Shipping 1 2011-10-01 2011-10-01 false Insulation of exterior boundaries: Superstructures and deckhouses-T...Laying Date On or After January 1, 1975 § 32.56-20 Insulation of exterior boundaries: Superstructures and...

  12. Dynamical evolution of two associated galactic bars

    NASA Astrophysics Data System (ADS)

    Garzón, F.; López-Corredoira, M.

    2014-10-01

    We study the dynamical interactions of mass systems in equilibrium under their own gravity that mutually exert and experience gravitational forces. The method we employ is to model the dynamical evolution of two isolated bars, hosted within the same galactic system, under their mutual gravitational interaction. In this study, we present an analytical treatment of the secular evolution of two bars that oscillate with respect to one another. Two cases of interaction, with and without geometrical deformation, are discussed. In the latter case, the bars are described as modified Jacobi ellipsoids. These triaxial systems are formed by a rotating fluid mass in gravitational equilibrium with its own rotational velocity and the gravitational field of the other bar. The governing equation for the variation of their relative angular separation is then numerically integrated, which also provides the time evolution of the geometrical parameters of the bodies. The case of rigid, non-deformable, bars produces in some cases an oscillatory motion in the bodies similar to that of a harmonic oscillator. For the other case, a deformable rotating body that can be represented by a modified Jacobi ellipsoid under the influence of an exterior massive body will change its rotational velocity to escape from the attracting body, just as if the gravitational torque exerted by the exterior body were of opposite sign. Instead, the exchange of angular momentum will cause the Jacobian body to modify its geometry by enlarging its long axis, located in the plane of rotation, thus decreasing its axial ratios.

  13. A SpaceTime Finite Element Method for the Exterior Acoustics Problem

    E-print Network

    Thompson, Lonny L.

    problem in exterior domains is discussed. The space­time formulation for the exterior acoustics problem space and time. The result is an algorithm for direct transient analysis of acoustic ra­ diationA Space­Time Finite Element Method for the Exterior Acoustics Problem by Lonny L. Thompson

  14. Storage Rings

    SciTech Connect

    Fischer, W.

    2011-01-01

    Storage rings are circular machines that store particle beams at a constant energy. Beams are stored in rings without acceleration for a number of reasons (Tab. 1). Storage rings are used in high-energy, nuclear, atomic, and molecular physics, as well as for experiments in chemistry, material and life sciences. Parameters for storage rings such as particle species, energy, beam intensity, beam size, and store time vary widely depending on the application. The beam must be injected into a storage ring but may not be extracted (Fig. 1). Accelerator rings such as synchrotrons are used as storage rings before and after acceleration. Particles stored in rings include electrons and positrons; muons; protons and anti-protons; neutrons; light and heavy, positive and negative, atomic ions of various charge states; molecular and cluster ions, and neutral polar molecules. Spin polarized beams of electrons, positrons, and protons were stored. The kinetic energy of the stored particles ranges from 10{sup -6} eV to 3.5 x 10{sup 12} eV (LHC, 7 x 10{sup 12} eV planned), the number of stored particles from one (ESR) to 1015 (ISR). To store beam in rings requires bending (dipoles) and transverse focusing (quadrupoles). Higher order multipoles are used to correct chromatic aberrations, to suppress instabilities, and to compensate for nonlinear field errors of dipoles and quadrupoles. Magnetic multipole functions can be combined in magnets. Beams are stored bunched with radio frequency systems, and unbunched. The magnetic lattice and radio frequency system are designed to ensure the stability of transverse and longitudinal motion. New technologies allow for better storage rings. With strong focusing the beam pipe dimensions became much smaller than previously possible. For a given circumference superconducting magnets make higher energies possible, and superconducting radio frequency systems allow for efficient replenishment of synchrotron radiation losses of large current electron or positron beams. Storage rings have instrumentation to monitor the electrical and mechanical systems, and the beam quality. Computers are used to control the operation. Large storage rings have millions of control points from all systems. The time dependent beam intensity I(t) can often be approximated by an exponential function I(t) = I(0) exp(-t/{tau}) (1) where the decay time {tau} and, correspondingly, the store time ranges from a few turns to 10 days (ISR). {tau} can be dominated by a variety of effects including lattice nonlinearities, beam-beam, space charge, intrabeam and Touschek scattering, interaction with the residual gas or target, or the lifetime of the stored particle. In this case, the beam lifetime measurement itself can be the purpose of a storage ring experiment. The main consideration in the design of a storage ring is the preservation of the beam quality over the store length. The beam size and momentum spread can be reduced through cooling, often leading to an increase in the store time. For long store times vacuum considerations are important since the interaction rate of the stored particles with the residual gas molecules is proportional to the pressure, and an ultra-high vacuum system may be needed. Distributed pumping with warm activated NEG surfaces or cold surfaces in machines with superconducting magnets are ways to provide large pumping speeds and achieve low pressures even under conditions with dynamic gas loads. The largest application of storage rings today are synchrotron light sources, of which about 50 exist world wide. In experiments where the beam collides with an internal target or another beam, a storage ring allows to re-use the accelerated beam many times if the interaction with the target is sufficiently small. In hadron collider and ion storage rings store times of many hours or even days are realized, corresponding to up to 1011 turns and thereby target passages. Ref. [3] is the first proposal for a collider storage ring. A number of storage rings exist where the beam itself or its decay products are the object of s

  15. Ghostly Ring

    NASA Technical Reports Server (NTRS)

    2008-01-01

    [figure removed for brevity, see original site] Click on image for poster version

    This image shows a ghostly ring extending seven light-years across around the corpse of a massive star. The collapsed star, called a magnetar, is located at the exact center of this image. NASA's Spitzer Space Telescope imaged the mysterious ring around magnetar SGR 1900+14 in infrared light. The magnetar itself is not visible in this image, as it has not been detected at infrared wavelengths (it has been seen in X-ray light).

    Magnetars are formed when a massive giant star ends its life in a supernova explosion, leaving behind a super dense neutron star with an incredibly strong magnetic field. The ring seen by Spitzer could not have formed during the original explosion, as any material as close to the star as the ring would have been disrupted by the supernova shock wave. Scientists suspect that the ring my actually be the edges of a bubble that was hollowed out by an explosive burst from the magnetar in 1998. The very bright region near the center of the image is a cluster of young stars, which may be illuminating the inner edge of the bubble, making it look like a ring in projection.

    This composite image was taken using all three of Spitzer's science instruments. The blue color represents 8-micron infrared light taken by the infrared array camera, green is 16-micron light from the infrared spectograph, and red is 24-micron radiation from the multiband imaging photometer.

  16. Resonance Rings

    NSDL National Science Digital Library

    This is an activity about resonance and where it is found in related to astronomy. Learners will construct two differently sized rings out of file folder paper and tape them to a piece of cardboard. Next, they will shake the cardboard from side to side, which shakes the rings, and observe what happens when the frequency of the shaking is gradually increased. This activity is from the Stanford Solar Center's All About the Sun: Sun and Stars activity guide for Grades 5-8 and can also accompany the Stanford Solar Center's Build Your Own Spectroscope activity.

  17. Detection and Behavior of Pan Wakes in Saturn's A Ring

    NASA Technical Reports Server (NTRS)

    Horn, L. J.; Showalter, M. R.; Russell, C. T.

    1996-01-01

    Six previously unseen Pan wakes are found interior and exterior to the Encke gap in Saturn's A ring, one in the Voyager 2 photopolarimeter (PPS) stellar occultation data and five in the Voyager 1 radio science (RSS) Earth occultation data. Pan orbits at the center of the Encke gap and maintains it...The detection of Pan wakes at longitudes greater than 360(deg) demonstrates that wakes persist for much longer than originally hypothesized and may interact with one another.

  18. Vascular ring

    MedlinePLUS

    ... following tests can help diagnose vascular ring: Chest x-ray Computed tomography (CT) scan of the heart and major blood vessels Camera down the throat to examine the airways (bronchoscopy) ... of heart X-ray of blood vessels (angiography) X-ray of the ...

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

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

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

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

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

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

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

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

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

  2. Spray Foam Exterior Insulation with Stand-Off Furring

    SciTech Connect

    Herk, A.; Baker, R.; Prahl, D.

    2014-03-01

    IBACOS, in collaboration with GreenHomes America, was contracted by the New York State Energy Research and Development Authority to research exterior wall insulation solutions. This research investigated cost-effective deep energy retrofit (DER) solutions for improving the building shell exterior while achieving a cost-reduction goal, including reduced labor costs to reach a 50/50 split between material and labor. The strategies included exterior wall insulation plus energy upgrades as needed in the attic, mechanical and ventilation systems, and basement band joist, walls, and floors. The work can be integrated with other home improvements such as siding or window replacement. This strategy minimizes physical connections to existing wall studs, encapsulates existing siding materials (including lead paint) with spray foam, and creates a vented rain screen assembly to promote drying. GreenHomes America applied construction details created by IBACOS to a test home. 2x4 framing members were attached to the wall at band joists and top plates using 'L' clips, with spray foam insulating the wall after framing was installed. Windows were installed simultaneously with the framing, including extension jambs. The use of clips in specific areas provided the best strength potential, and 'picture framing' the spray foam held the 2x4s in place. Short-term testing was performed at this house, with monitoring equipment installed for long-term testing. Testing measurements will be provided in a later report, as well as utility impact (before and after), costs (labor and materials), construction time, standard specifications, and analysis for the exterior wall insulation strategy.

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

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

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

  4. 26. Generator Voltage Regulator Cabinet Exterior for Unit 1, view ...

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

    26. Generator Voltage Regulator Cabinet Exterior for Unit 1, view to the northwest. The exciter supplies the DC current to the generator rotor to create electricity. Each of the four original units has an exciter identical to this one, and all are scheduled for replacement. - Washington Water Power Clark Fork River Noxon Rapids Hydroelectric Development, Powerhouse, South bank of Clark Fork River at Noxon Rapids, Noxon, Sanders County, MT

  5. 1. EXTERIOR VIEW OF 500 HINES STREET LOOKING SOUTHWEST. THIS ...

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

    1. EXTERIOR VIEW OF 500 HINES STREET LOOKING SOUTHWEST. THIS DWELLING WAS WORKER HOUSING FOR THE LaGRANGE COTTON MILL (1888-89), LATER KNOWN AS CALUMET MILL. THE SIZE OF THIS HOUSE INDICATES THAT IT WAS PROBABLY USED BY A MILL MANAGER OR OVERSEER. NOTE 502 HINES STREET TO THE LEFT, A MIRROR-IMAGE OF 500 HINES STREET. - 500 Hines Street (House), 500 Hines Street, La Grange, Troup County, GA

  6. EXTERIOR PERSPECTIVE SHOWING CONNECTION BETWEEN THE HOG BARN AND THE ...

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

    EXTERIOR PERSPECTIVE SHOWING CONNECTION BETWEEN THE HOG BARN AND THE 1954 ADDITION, LOOKING NORTH. (After a fire destroyed the main barn on the property, this addition was hastily added to the north end of the hog barn to provide temporary storage for hay bales. Fifty-four years later, the barn addition is still in use.) - Engle Farm, Barn, 89 South Ebey Road, Coupeville, Island County, WA

  7. BARN EXTERIOR PERSPECTIVE OF WEST FAÇADE FROM ACCESS ROAD, LOOKING ...

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

    BARN EXTERIOR PERSPECTIVE OF WEST FAÇADE FROM ACCESS ROAD, LOOKING EAST. (A shed addition was added to the north end of the barn in the mid-1950s for squash storage. Another addition was built in the early 1970s to provide feeding and watering troughs for cattle. This image also shows the granary, on the right.) - Smith Farm, Barn, 399 Ebey Road, Coupeville, Island County, WA

  8. Exterior view of south and east walls of Oxidizer Conditioning ...

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

    Exterior view of south and east walls of Oxidizer Conditioning Structure (T-28D), looking northwest. This structure was designed to condition nitrogen tetroxide, the oxidizer used in the Titan II's fuel system, to specified temperatures. The taller structure to the rear is the Long-Term Oxidizer Silo (T-28B) - Air Force Plant PJKS, Systems Integration Laboratory, Oxidizer Conditioning Structure, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

  9. Why a ring of stars at r = 20 kpc?

    E-print Network

    Pierre Sikivie

    2003-09-23

    The recently discovered ring of stars near Galactocentric distance $r = 20$ kpc is interpreted as baryonic matter accreted onto the second caustic ring of dark matter in our galaxy. Caustic rings of dark matter were predicted in the Galactic plane at radii $a_n \\simeq 40 kpc/n$ where $n=1,2,3 ..$. They can reveal themselves by their gravitational influence on the distribution of baryonic matter. There is additional evidence for caustic rings of dark matter in the Milky Way from a series of sharp rises in the Galactic rotation curve. The positions of the rises are consistent at the 3% level with the above law for the caustic ring radii. Also, a triangular feature in the IRAS map of the galactic plane is consistent with the imprint of the caustic ring of dark matter nearest to us ($n=5$) upon dust and gas in the Galactic plane. These observations imply that the dark matter in our neighborhood is dominated by a single flow whose density and velocity vector are estimated.

  10. Ring lasers

    SciTech Connect

    Lindop, A.J.

    1981-01-27

    The invention provides a ring laser having one or more parallelsided prisms, or other refracting device, positioned in the light path of the laser resonant cavity formed by, for example, three mirrors, and including a solenoid or other means for imparting oscillatory translational motion to the prism or prisms or refracting device with a component parallel to the portion of the light path which passes therethrough.

  11. The Galactic Anticenter Stellar Stream

    E-print Network

    Helio J. Rocha-Pinto; Steven R. Majewski; M. F. Skrutskie; Jeffrey D. Crane

    2003-07-11

    The recently discovered, ring-like structure just outside the Galactic disk in Monoceros is detected and traced among 2MASS M giant stars. We have developed a method to recover the signature of this structure from the distance probability density function of stars along a given line of sight. Its detection is possible even when the metallicity is unknown, provided that the structure is not too embedded in the disk. Application of this method reveals the presence of a large group of M giant stars at a Galactocentric distance of 18$\\pm 2$ kpc, over $+36\\degrring that surrounds the Galaxy, but as a more localized structure, possibly a merging dwarf galaxy with tidal arms, like the Sagittarius dwarf galaxy.

  12. Modeled and metered energy savings from exterior wall insulation

    SciTech Connect

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

    1996-09-01

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

  13. Modal decomposition of exterior acoustic-structure interaction problems with model order reduction.

    PubMed

    Peters, Herwig; Kessissoglou, Nicole; Marburg, Steffen

    2014-05-01

    A numerical technique for modal decomposition of the acoustic responses of structures submerged in a heavy fluid medium using fluid-loaded structural modes is presented. A Krylov subspace model order reduction approach to reduce the computational effort required for a fully coupled finite element/boundary element model is described. By applying the Krylov subspace to only the structural part of the global system of equations for the fully coupled problem, only the frequency independent finite element matrices are reduced. A fluid-loaded cylindrical shell closed at each end by hemispherical end caps is examined. The cylinder is excited by a ring of axial or transverse forces acting at one end. The individual contributions of the cylinder circumferential modes to the sound power and directivity of the radiated sound pressure are observed. The technique presented here provides a tool for greater physical insight into exterior acoustic-structure interaction problems using fully coupled numerical models, with significantly reduced computational effort. PMID:24815254

  14. 1. EXTERIOR VIEW OF NEW FAN HOUSE AND HILLMAN FAN ...

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

    1. EXTERIOR VIEW OF NEW FAN HOUSE AND HILLMAN FAN HOUSE LOOKING NORTHWEST The building on the left, the New Fan House, houses a Corliss steam engine which powered a Buffalo Forge Company single inlet Duplex Conoidal centrifugal exhausted fan through a metal updraft chimney. Part of the brick airway leading to the Baltimore shaft is visible to its right rear. The Hillman Fan House, on the right, houses the 1883 double inlet Guibal fan. The south entry, the curve of the fan housing, and brick updraft chimney are visible in this view. - Dorrance Colliery Fan Complex, South side of Susquehanna River at Route 115 & Riechard Street, Wilkes-Barre, Luzerne County, PA

  15. 10. SOUTHEAST EXTERIOR CORNER. During demolition large iron bars were ...

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

    10. SOUTHEAST EXTERIOR CORNER. During demolition large iron bars were found embedded in the south brick walls about 11 courses above the water table. These were possibly used to secure the roof structure of a shed which housed the fire engine of the Relief Fire Company (see Articles of Agreement, 1815, papers of the Central Philadelphia Meeting), which specified that the Engine House was to be situated at the northeast corner of the lot. Perhaps at some later date the shed was moved. - Twelfth Street Meeting House, 20 South Twelfth Street, Philadelphia, Philadelphia County, PA

  16. 6. EXTERIOR VIEW OF HILLMAN FAN HOUSE LOOKING WEST The ...

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

    6. EXTERIOR VIEW OF HILLMAN FAN HOUSE LOOKING WEST The engine house is on the right. The end of the 1883 Pittston Steam Engine cylinder head and steam chest is visible in the doorway. Although its stairs are missing, the iron framing of a porch stands in front of what was a doorway. The entrance door to the north airlock is visible inside the enlarged window. The end view of the upshaft chimney shows the brick ribbing for support, the brick corbelling, and concrete capstones. - Dorrance Colliery Fan Complex, South side of Susquehanna River at Route 115 & Riechard Street, Wilkes-Barre, Luzerne County, PA

  17. Exterior view of submarine with survey crew posed in front. ...

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

    Exterior view of submarine with survey crew posed in front. From left to right: Todd Croteau - U.S. National Park Service, Joshua Price - U.S. Navy, Bert Ho - National Oceanic and Atmospheric Administration, Michael McCarthy - Western Australia Maritime Museum, Larry Murphy - U.S. National Park Service, Don Johnson- University of Nebraska Engineering School, James Delgado- Institute for Nautical Archeology, Jacinto Ahmendra - Government of Panama. - Sub Marine Explorer, Located along the beach of Isla San Telmo, Pearl Islands, Isla San Telmo, Former Panama Canal Zone, CZ

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

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

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

  19. EXTERIOR ELEVATIONS. United Engineering Company Ltd., Alameda Shipyard, Ship Repair ...

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

    EXTERIOR ELEVATIONS. United Engineering Company Ltd., Alameda Shipyard, Ship Repair Facilities, Office Building. Includes lettering detail for front elevation. John Hudspeth, Architect, at foot of Main Street, Alameda, Calif. Sheet no. A3 of 8 sheets, Plan no. 10,007. Scale 1/8 inch to the foot. March 18, 1942, last revised 9/21/43. U.S. Navy, Bureau of Yards & Docks, Contract no. bs 76. Approved for construction October 9, 1943. blueprint - United Engineering Company Shipyard, Office Building No. 137, 2900 Main Street, Alameda, Alameda County, CA

  20. Origami rings

    E-print Network

    Buhler, Joe; de Launey, Warwick; Graham, Ron

    2010-01-01

    Motivated by a question in origami, we consider sets of points in the complex plane constructed in the following way. Let $L_\\alpha(p)$ be the line in the complex plane through $p$ with angle $\\alpha$ (with respect to the real axis). Given a fixed collection $U$ of angles, let $\\RU$ be the points that can be obtained by starting with $0$ and $1$, and then recursively adding intersection points of the form $L_\\alpha(p) \\cap L_\\beta(q)$, where $p, q$ have been constructed already, and $\\alpha, \\beta$ are distinct angles in $U$. Our main result is that if $U$ is a group with at least three elements, then $\\RU$ is a subring of the complex plane, i.e., it is closed under complex addition and multiplication. This enables us to answer a specific question about origami folds: if $n \\ge 3$ and the allowable angles are the $n$ equally spaced angles $k\\pi/n$, $0 \\le k < n$, then $\\RU$ is the ring $\\Z[\\zeta_n]$ if $n$ is prime, and the ring $\\Z[1/n,\\zeta_{n}]$ if $n$ is not prime, where $\\zeta_n := \\exp(2\\pi i/n)$ is ...

  1. Earth: A Ringed Planet?

    Microsoft Academic Search

    L. O. Hancock; H. Povenmire

    2010-01-01

    Among the most beautiful findings of the Space Age have been the discoveries of planetary rings. Not only Saturn but also Jupiter, Uranus and Neptune have rings; Saturn's ring system has structures newly discovered; even Saturn's moon Rhea itself has a ring. All these are apparently supplied by material from the planetary moons (Rhea's ring by Rhea itself). The question

  2. Imaging of a circumsolar dust ring near the orbit of Venus.

    PubMed

    Jones, M H; Bewsher, D; Brown, D S

    2013-11-22

    The gravitational interaction of dust in the zodiacal cloud with individual planets is expected to give rise to ringlike features: Such a circumsolar ring has been observed associated with Earth, but such resonance rings have not been confirmed to exist for other planets. Here, we report on sensitive photometric observations, based on imaging from the STEREO mission, that confirm the existence of a dust ring at the orbit of Venus. The maximum overdensity of dust in this ring, compared to the zodiacal cloud, is ~10%. The radial density profile of this ring differs from the model used to describe Earth's ring in that it has two distinct steplike components, with one step being interior and the other exterior to the orbit of Venus. PMID:24264987

  3. Ringing phenomenon of the fiber ring resonator.

    PubMed

    Ying, Diqing; Ma, Huilian; Jin, Zhonghe

    2007-08-01

    A resonator fiber-optic gyro (R-FOG) is a high-accuracy inertial rotation sensor based on the Sagnac effect. A fiber ring resonator is the core sensing element in the R-FOG. When the frequency of the fiber ring resonator input laser is swept linearly with time, ringing of the output resonance curve is observed. The output field of the fiber ring resonator is derived from the superposition of the light transmitted through the directional coupler directly and the multiple light components circulated in the fiber ring resonator when the frequency of the laser is swept. The amplitude and phase of the output field are analyzed, and it is found that the difference in time for different light components in the fiber ring resonator to reach a point of destructive interference causes the ringing phenomenon. Finally the ringing phenomenon is observed in experiments, and the experimental results agree with the theoretical analysis well. PMID:17676092

  4. Ringing phenomenon of the fiber ring resonator

    NASA Astrophysics Data System (ADS)

    Ying, Diqing; Ma, Huilian; Jin, Zhonghe

    2007-08-01

    A resonator fiber-optic gyro (R-FOG) is a high-accuracy inertial rotation sensor based on the Sagnac effect. A fiber ring resonator is the core sensing element in the R-FOG. When the frequency of the fiber ring resonator input laser is swept linearly with time, ringing of the output resonance curve is observed. The output field of the fiber ring resonator is derived from the superposition of the light transmitted through the directional coupler directly and the multiple light components circulated in the fiber ring resonator when the frequency of the laser is swept. The amplitude and phase of the output field are analyzed, and it is found that the difference in time for different light components in the fiber ring resonator to reach a point of destructive interference causes the ringing phenomenon. Finally the ringing phenomenon is observed in experiments, and the experimental results agree with the theoretical analysis well.

  5. Asymmetric dipolar ring

    DOEpatents

    Prosandeev, Sergey A. (Fayetteville, AR); Ponomareva, Inna V. (Tampa, FL); Kornev, Igor A. (Ill-de-France, FR); Bellaiche, Laurent M. (Fayetteville, AR)

    2010-11-16

    A device having a dipolar ring surrounding an interior region that is disposed asymmetrically on the ring. The dipolar ring generates a toroidal moment switchable between at least two stable states by a homogeneous field applied to the dipolar ring in the plane of the ring. The ring may be made of ferroelectric or magnetic material. In the former case, the homogeneous field is an electric field and in the latter case, the homogeneous field is a magnetic field.

  6. Young Galactic Globular Clusters

    E-print Network

    Sidney van den Bergh

    1998-02-12

    Nine presently known "young" Galactic globular clusters, which have ages / 3 Gyr smaller than the oldest clusters of similar metallicity, all have RGC > 15 kpc. Furthermore these young globulars are found to have below-average luminosities. These results suggest that (1) globular cluster formation extended over a considerable period of time in the outermost part of the Galactic halo, and (2) that typical luminosities (masses) of such outer halo clusters decreased with time.

  7. DIFFERENTIAL POLYNOMIAL RINGS OF TRIANGULAR MATRIX RINGS

    Microsoft Academic Search

    H. GHAHRAMANI; A. MOUSSAVI

    2008-01-01

    Let R,S be rings with identity and M be a unitary (R,S)-bimodule. We characterize homomorphisms and derivations of the generalized matrix ring T = R M 0 S , and provide a tri- angular representation of the dierential polynomial ring T( ;d).

  8. Determination of ring correction factors for leaded gloves used in grab sampling activities at Hanford tank farms

    SciTech Connect

    RATHBONE, B.A.

    1999-06-24

    This study evaluates the effectiveness of lead lined gloves in reducing extremity dose from two sources specific to tank waste sampling activities: (1) sludge inside glass sample jars and (2) sludge as thin layer contamination on the exterior surface of sample jars. The response of past and present Hanford Extremity Dosimeters (ring) designs under these conditions is also evaluated.

  9. The Two Dimensional Euler Equations on Singular Exterior Domains

    NASA Astrophysics Data System (ADS)

    Gérard-Varet, David; Lacave, Christophe

    2015-05-01

    This paper is a follow-up of uc(Gérard-Varet) and uc(Lacave) (Arch Ration Mech Anal 209(1):131-170, 2013), on the existence of global weak solutions to the two dimensional Euler equations in singular domains. In uc(Gérard-Varet) and uc(Lacave) (Arch Ration Mech Anal 209(1):131-170, 2013), we have established the existence of weak solutions for a large class of bounded domains, with initial vorticity in L p (p > 1). For unbounded domains, we have proved a similar result only when the initial vorticity is in {Lpc} (p > 2) and when the domain is the exterior of a single obstacle. The goal here is to retrieve these two restrictions: we consider general initial vorticity in {L1 {\\cap} Lp} (p > 1), outside an arbitrary number of obstacles (not reduced to points).

  10. Electrochemical cell apparatus having an exterior fuel mixer nozzle

    DOEpatents

    Reichner, P.; Doshi, V.B.

    1992-12-08

    An electrochemical apparatus is made having a generator section containing electrochemical cells, a fresh gaseous feed fuel inlet, a gaseous feed oxidant inlet, and at least one hot gaseous spent fuel recirculation channel, where the spent fuel recirculation channel, a portion of which is in contact with the outside of a mixer chamber, passes from the generator chamber to combine with the fresh feed fuel inlet at the entrance to the mixer chamber, and a mixer nozzle is located at the entrance to the mixer chamber, where the mixer chamber connects with the reforming chamber, and where the mixer-diffuser chamber and mixer nozzle are exterior to and spaced apart from the combustion chamber, and the generator chamber, and the mixer nozzle can operate below 400 C. 2 figs.

  11. Closeup view of the exterior of the starboard side of ...

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

    Close-up view of the exterior of the starboard side of the forward fuselage of the Orbiter Discovery looking at the forward facing observation windows of the flight deck. Note the High-temperature Reusable Surface Insulation (HRSI) surrounding the window openings, the Low-temperature Reusable Surface Insulation (LRSI) immediately beyond the HRSI tiles and the Advanced Flexible Reusable Surface Insulation blankets just beyond the LRSI tiles. The holes in the tiles are injection points for the application of waterproofing material. The windows are composed of redundant pressure window panes of thermal glass. This image was taken from a service platform in the Orbiter Processing Facility at Kennedy Space Center - Space Transportation System, Orbiter Discovery (OV-103), Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, Harris County, TX

  12. Electrochemical cell apparatus having an exterior fuel mixer nozzle

    DOEpatents

    Reichner, Philip (Plum Borough, PA); Doshi, Vinod B. (Monroeville, PA)

    1992-01-01

    An electrochemical apparatus (10) is made having a generator section (22) containing electrochemical cells (16), a fresh gaseous feed fuel inlet (28), a gaseous feed oxidant inlet (30), and at least one hot gaseous spent fuel recirculation channel (46), where the spent fuel recirculation channel (46), a portion of which is in contact with the outside of a mixer chamber (52), passes from the generator chamber (22) to combine with the fresh feed fuel inlet (28) at the entrance to the mixer chamber, and a mixer nozzle (50) is located at the entrance to the mixer chamber, where the mixer chamber (52) connects with the reforming chamber (54), and where the mixer-diffuser chamber (52) and mixer nozzle (50) are exterior to and spaced apart from the combustion chamber (24), and the generator chamber (22), and the mixer nozzle (50) can operate below 400.degree. C.

  13. The acoustical testing of thermally insulated exterior building elements

    SciTech Connect

    Peppin, R.J. [Larson Davis, Inc., Rockville, MD (United States); Duersch, G.M. [Larson Davis, Inc., Provo, UT (United States); Beam, M.J.; Miller, K. [Miller Henning Associates, McLean, VA (United States)

    1997-11-01

    Often, but not always, acoustical insulation is used in place of thermal insulation, and vice versa. Often also, both are used for the same purpose. But the thermal and acoustical properties of a material are different and often not related. Hence a good thermal insulator may or may not be a good acoustical insulator. The physics of heat transfer and sound are different. As a result, the results of testing of the materials for one property do not necessarily provide any indication of the other property. This paper discusses the commonalties and differences of the thermal and acoustical materials used for exterior building elements and discuss national and international methods of acoustical test, emphasizing ASTM testing where appropriate.

  14. A. Advertising and Signs Exterior signage is allowed for students sponsored activities, clubs and events to

    E-print Network

    Wu, Shin-Tson

    A. Advertising and Signs Exterior signage is allowed for students sponsored activities, clubs and events to promote student participation. 1. Student organizations may use exterior signs to advertise. A maximum of three wood signs may be posted for advertising an activity, club or event. 4. All signs must

  15. On the non-existence of surface waves trapped by submerged obstructions having exterior cusp points

    E-print Network

    On the non-existence of surface waves trapped by submerged obstructions having exterior cusp points when the depth profile or submerged obsta- cles have exterior cusp points with horizontal tangents cylinders submerged parallel to the free surface and a plane beach. We are interested in modes of fluid

  16. Que pas este? Narrativas sobre o Brasil criadas por brasileiros residentes no exterior

    E-print Network

    Paris-Sud XI, Université de

    Que país é este? Narrativas sobre o Brasil criadas por brasileiros residentes no exterior Luis utilizados no Brasil, como o Orkut, existem mais de sessenta comunidades com o título "Brasileiros-representação e a imagem do Brasil e dos brasileiros no exterior ou sobre a percepção da terra de chegada. O

  17. A Space-Time Finite Element Method for the Exterior Acoustics Problem

    E-print Network

    Thompson, Lonny L.

    in exterior domains is discussed. The space-time formulation for the exterior acoustics problem is obtained and time. The result is an algorithm for direct transient analysis of acoustic radiation and scattering acoustics problem. Still, a direct time-domain approach is necessary whenever nonlinearities occur and may

  18. Acoustical and thermal performance of exterior residential walls, doors, and windows

    Microsoft Academic Search

    H. J. Sabine; M. B. Lacher; D. R. Flynn; T. L. Quindry

    1975-01-01

    Laboratory tests of sound transmission loss, thermal transmittance, and rate of air leakage were conducted on full scale (9 feet high x 14 feet wide; 2.7 x 4.3 meters) specimens of typical residential exterior wall constructions, either unbroken or penetrated by a door or window. The walls were of wood frame construction with gypsum board drywall interior finish and exterior

  19. A TRANSMISSION PROBLEM FOR FLUID-STRUCTURE INTERACTION IN THE EXTERIOR OF A THIN DOMAIN

    E-print Network

    attempt to resolve not only the uid pressure in the exterior, but also the elastodynamic oscillations not have unique solutions. Even in the absence of a pressure #12;eld in the exterior uid region of frequencies. The existence of solutions is usually demonstrated by casting the problem into variational form

  20. Computational Fluid Dynamics and Experimental Validations of the Direct Coupling Between Interior, Intermediate and Exterior Ballistics

    E-print Network

    Paris-Sud XI, Université de

    , Intermediate and Exterior Ballistics Using the Euler Equations Dr. R. Cayzac1 , E. Carette1 , Pr. T. Alziary de been working on the development of a CFD ballistics code called FREIN. This code is the result and exterior ballistics were modeled as well as the weapon system environment. The complex phenomena

  1. Investigation of vessel exterior air cooling for a HLMC reactor

    SciTech Connect

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

    2000-01-13

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

  2. On the Formation of Elliptical Rings in Disk Galaxies

    NASA Astrophysics Data System (ADS)

    Wu, Yu-Ting; Jiang, Ing-Guey

    2015-05-01

    N-body simulations of galactic collisions are employed to investigate the formation of elliptical rings in disk galaxies. The relative inclination between disk and dwarf galaxies is studied with a fine step of 5°. It is confirmed that the eccentricity of elliptical rings is linearly proportional to the inclination angle. Deriving from the simulational results, an analytic formula that expresses the eccentricity as a function of time and inclination angle is obtained. This formula will be useful for the interpretation of observations of ring systems, and therefore reveals the merging histories of galaxies.

  3. Molecular hydrogen in the Galaxy and galactic gamma rays

    NASA Technical Reports Server (NTRS)

    Stecker, F. W.; Solomon, P. M.; Scoville, N. Z.; Ryter, C. E.

    1975-01-01

    Recent surveys of 2.6-cm CO emission and 100-MeV gamma-radiation in the galactic plane reveal a striking correlation suggesting that both emissions may be primarily proportional to the line-of-sight column density of H2 in the inner Galaxy. Both the gamma-ray and CO data suggest a prominent ring or arm consisting of cool clouds of H2 at a galactocentric distance of about 5 kpc with a mean total hydrogen density equivalent to approximately 5 atoms per cu cm. Estimates are made of column densities of H2 at 0 deg galactic longitude and are compared with estimates from infrared and X-ray absorption measurements. These estimates are all consistent, indicating that H2 is far more abundant than H I in the inner Galaxy and is the key to a more satisfactory explanation of the gamma-ray observations than previous suggestions. The importance of H2 in understanding galactic gamma-ray observations is also reflected in the correlation of galactic-latitude distribution of gamma-rays and dense dust clouds. The deduced cosmic-ray distribution inferred from the calculations is similar to that of galactic supernova remnants, suggesting a galactic origin for most cosmic rays.

  4. Stirling engine piston ring

    DOEpatents

    Howarth, Roy B. (Clifton Park, NY)

    1983-01-01

    A piston ring design for a Stirling engine wherein the contact pressure between the piston and the cylinder is maintained at a uniform level, independent of engine conditions through a balancing of the pressure exerted upon the ring's surface and thereby allowing the contact pressure on the ring to be predetermined through the use of a preloaded expander ring.

  5. FDDI Ring Demonstration

    NSDL National Science Digital Library

    This applet demonstrates an FDDI ring. Users may add or delete stations (or computers) from the ring. The applet allows the user to show data being circulated around the ring. Users may also select to demonstrate the cases when the ring becomes broken or when one of the stations is switched off. (UNC E-Learning Grant)

  6. Imaging and mapping the circumsolar dust ring near the orbit of Venus

    NASA Astrophysics Data System (ADS)

    Jones, M.; Bewsher, D.; Brown, D.

    2014-07-01

    Asteroids and comets are the dominant source of dust feeding the zodiacal cloud [1,2]. The orbits of grains of size 10--100 microns are expected to decay by Poynting-Robertson drag [3], but in the vicinity of planetary orbits dust may get trapped into exterior mean motion resonances [4] to form a circumsolar dust ring. It has long been known that such a ring exists close to the Earth's orbit [5], but even now, little is known about its detailed structure. No such ring or associated resonance feature has been detected at the orbits of Mars or Jupiter [6]. While re-analysis of photometry data from the Helios mission provided some evidence of a ring associated with Venus [7], the existence of such a ring could not be conclusively demonstrated. Here we report on recent work that confirms the existence of a circumsolar ring at Venus from sensitive optical photometry of the zodiacal cloud [8]. Our analysis uses synoptic images from the HI-2 instrument on STEREO [9]. We discuss the techniques that we have developed to extract images of the Venus ring, and describe the approach taken towards creating a simple parametric model of the ring. We note that the maximum over-density in the ring is about 10% that of the smooth zodiacal cloud, and we highlight other aspects of the ring structure that we have already determined. We demonstrate that the STEREO HI-2 data allow the density structure of the Venus ring to be mapped in much greater detail than the Earth ring. Thus the Venus ring has the potential to provide a stringent test of models of resonance ring formation. Not only is this relevant to understanding the structure of the zodiacal cloud, it is of importance in the context of exoplanetary systems which are also expected to display analogous circumstellar dust rings [10,11]. We conclude by discussing current progress in mapping the density distribution of the Venus circumsolar ring.

  7. Energetics of galactic nuclei.

    NASA Astrophysics Data System (ADS)

    Sahakian, G. S.

    1997-10-01

    A model of compact galactic nuclei in statistical equilibrium was developed in [L. Sh. Grigorian and G. S. Sahakian, Astrofizika (in press)]. It was shown that they should consist predominantly of neutron stars (pulsars) and white dwarfs. The problem of the energy reserves of galactic nuclei is discussed in terms of this concept. The mechanism of conversion of a white dwarf into a neutron star due to the accretion of interstellar matter is considered. This means that a galactic nucleus has an energy reserve of some 5·1060 N8 erg (N is the number of stars in the nucleus). It is shown that galactic nuclei are powerful sources of hard ? radiation [power L » 2·1044µ30N8(?/50)17/7 erg/sec, where µ is the magnetic moment and ? is the angular rotation rate of a neutron star ] due to curvature radiation from relativistic electron fluxes flowing along channels of open magnetic field lines of pulsars. The x-ray and ultraviolet emission are due to synchrotron emission from the same electron fluxes in the magnetic field of the galactic nucleus (L » 1042-1044 erg/sec). The optical (visible and infrared) and radio emission are due to bremsstrahlung from electrons in the interstellar medium [L » 6·1046N{8/2} (5/Rpc)3 erg/sec, where R is the radius of the galactic nucleus]. An equation is obtained for the magnetic moment of a pulsar: µ ? 3.4·10-5L?P17/7, where P is the pulsar’s period and L03B3; is the luminosity of the pulsar’s y radiation.

  8. Formation of Galactic Disks

    E-print Network

    S. Michael Fall

    2002-03-27

    We review progress in understanding the formation of galactic disks in the standard cosmogonic scenario involving gravitational clustering of baryons and dark matter and dissipative collapse of the baryons. This scenario accounts remarkably well for the observed properties of galactic disks if they have retained most of the specific angular momentum they acquired by tidal torques. Early simulations, which included cooling of the gas but not star formation and the associated feedback, indicated instead that most of the angular momentum of the baryons would be transferred to the dark matter. Recent simulations indicate that this angular-momentum problem can be solved partially, and in some cases entirely, by feedback and other effects.

  9. Cassini-VIMS Observations of Saturn's Rings at SOI

    NASA Astrophysics Data System (ADS)

    Nicholson, P. D.; Clark, R. N.; Cruikshank, D. P.; Showalter, M. R.; Sicardy, B.; Cassini VIMS

    2004-11-01

    Following the Cassini spacecraft's Saturn Orbit Insertion (SOI) burn on 1 July 2004, the Visual and Infrared Mapping Spectrometer (VIMS) obtained near-infrared spectra from 0.9 to 5.1 ? m in two continuous radial scans across the unlit side of the rings, at ranges of ˜30,000 km. The first scan covers the outer C and inner B rings at a phase angle, ? = 82o and an emission angle, e = 47o, while the second covers the Cassini Division and entire A ring at ? = 59o and e = 63o. The solar incidence angle was 114o and the radial resolution of both scans is 15-20 km, with sampling intervals of 2-3 km. Structurally, the rings appear to have changed little, if at all, since the Voyager observations in 1980/81 and the 28 Sgr occultations in 1989. This similarity extends even to the quasi-irregular structure which characterizes the inner B ring on scales of ˜100 km. Spectrally, all regions of the rings scanned are dominated by water ice, with prominent absorption bands at 1.55, 2.0 and 3.0 ? m, as well as weaker bands at 1.04 and 1.25 ? m seen primarily in the A and B rings. The ice bands are strongest in the middle A ring, somewhat weaker in the B ring, and much weaker in the C ring and Cassini Division. Locally, however, the fractional band depths appear to be independent of optical depth, suggesting that the light diffusely transmitted through the rings at moderate phase angles is dominated by single scattering. Regionally, the transitions between the C and B rings and between the Cassini Division and A ring are marked by gradual changes in band depth over radial distances of a few thousand km, perhaps indicative of ballistic redistribution of material. A broad reflectance maximum at 3.6 ? m, characteristic of ice grain sizes less than 100 ? m, is prominent everywhere but particularly strong in the outermost parts of the A ring, exterior to the Encke Gap. Besides water ice, the most noteworthy spectral feature is a broad, shallow absorption in the 0.9-1.8 ? m region which we tentatively attribute to Fe-bearing minerals, most likely silicates. This feature is seen primarily in the outer C ring and the Cassini Division, but like the ice band depths it pays only modest attention to structural boundaries. This work was supported by NASA and ESA under contracts with the Cassini-Huygens Project.

  10. Molecular hydrogen in the galaxy and galactic gamma rays

    NASA Technical Reports Server (NTRS)

    Stecker, F. W.; Solomon, P. M.; Scoville, N. Z.; Ryter, C. E.

    1975-01-01

    Recent surveys of 2.6 mm CO emission and 100 MeV gamma-radiation in the galactic plane reveal a striking correlation suggesting that both emissions may be primarily proportional to the line-of-sight column density of H2 in the inner galaxy. Both the gamma ray and CO data suggest a prominent ring or arm consisting of cool clouds of H2 at a galactocentric distance of approximately 5 kpc with a mean density of approximately 4 atoms/cu cm. The importance of H2 in understanding galactic gamma ray observations is also reflected in the correlation of galactic latitude distribution of gamma rays and dense dust clouds. A detailed calculation of the gamma ray flux distribution in the 0 deg to 180 deg range using the CO data to obtain the average distribution of molecular clouds in the galaxy shows that most of the enhancement in the inner galaxy is due to pion-decay radiation and the 5 kpc ring plays a major role. Detailed agreement with the gamma ray data is obtained with the additional inclusion of contributions from bremsstrahlung and Compton radiation of secondary electrons and Compton radiation from the intense radiation field near the galactic center.

  11. Galactic Superwinds Circa 2001

    E-print Network

    Timothy M. Heckman

    2001-07-23

    In this contribution I summarize our current knowledge of the nature and significance of starburst-driven galactic winds (``superwinds''). Superwinds are complex multiphase outflows of cool, warm, and hot gas, dust, and magnetized relativistic plasma. The observational manifestations of superwinds result from the hydrodynamical interaction between the primary energy-carrying wind fluid and the ambient interstellar medium. Superwinds are ubiquitous in galaxies in which the global star-formation rate per unit area exceeds roughly 10$^{-1}$ M$_{\\odot}$ yr$^{-1}$ kpc$^{-2}$. This criterion is met by local starbursts and the high-z Lyman Break galaxies. Several independent datasets and techniques imply that the total mass and energy outflow rates in a superwind are comparable to the starburst's star-formation-rate and mechanical energy injection rate, respectively. Outflow speeds in interstellar matter entrained in the wind range from $\\sim 10^2$ to $10^3$ km/s, but the primary wind fluid itself may reach velocities as high as $\\sim$3000 km s$^{-1}$. The available X-ray and far-UV ($FUSE$) data imply that radiative losses in superwinds are not significant. Superwinds may have established the mass-metallicity relation in ellipticals and bulges, polluted the present-day inter-galactic medium to a metallicity of $\\sim$ 10 to 30% solar, heated the inter-galactic medium, and ejected enough dust into the inter-galactic medium to have potentially observable consequences.

  12. Implications of the IRAS data for galactic gamma-ray astronomy and EGRET

    NASA Technical Reports Server (NTRS)

    Stecker, F. W.

    1990-01-01

    Using the results of gamma-ray, millimeter wave and far infrared surveys of the galaxy, one can derive a logically consistent picture of the large scale distribution of galactic gas and cosmic rays, one tied to the overall processes of stellar birth and destruction on a galactic scale. Using the results of the IRAS far-infrared survey of the galaxy, the large scale radial distribution of galactic far-infrared emission were obtained independently for both the Northern and Southern Hemisphere sides of the Galaxy. It was found that the dominant feature in these distributions to be a broad peak coincident with the 5 kpc molecular gas cloud ring. Also found was evidence of spiral arm features. Strong correlations are evident between the large scale galactic distributions of far infrared emission, gamma-ray emission and total CO emission. There is a particularly tight correlation between the distribution of warm molecular clouds and far-infrared emission on a galactic scale.

  13. Jupiter's Main Ring/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 (28.5 miles) per picture element (pixel) along Jupiter's rings. 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 2.3 million kilometers (1.4 million miles) away. The arc on the far right of the image is produced when sunlight is 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, outside 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 figure's far left side. 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. Some radial structure is barely visible across the ring's ansa (top image). A faint mist of particles can be seen above and below the main rings. This vertically extended 'halo' is unusual in planetary rings, and is probably caused by electromagnetic forces pushing the smallest grains out of the ring plane. Because of shadowing, the halo is not visible close to Jupiter in the lower right part of the mosaic. To accentuate faint features in the bottom image of the ring halo, different brightnesses are shown through color. Brightest features are white or yellow and the faintest are purple.

    Jupiter's main ring is a thin strand of material encircling the planet. The diffuse innermost boundary begins at approximately 123,000 kilometers (76,429 miles). The main ring's outer radius is found to be at 128,940 kilometers (80,119 miles) +/-50 kilometers (31 miles), slightly less than the Voyager value of 129,130 kilometers (80,237 miles) +/-100 kilometers (62 miles), but very close to the orbit of the satellite Adrastea (128,980 kilometers or 80,144 miles). The main ring exhibits a marked drop in brightness at 127,849 kilometers (79,441 miles) +/-50 kilometers (31 miles), lying almost atop the orbit of the Jovian moon Metis at 127,978 kilometers (79,521 miles). Satellites seem to affect the structure of even tenuous rings like those found at Jupiter.

    The Jet Propulsion Laboratory, Pasadena, CA manages the Galileo mission for NASA's Office of Space Science, Washington, DC. JPL is an operating division of California Institute of Technology (Caltech).

    This image and other images and data received from Galileo are posted on the World Wide Web, on the Galileo mission home page at URL http://galileo.jpl.nasa.gov. Background information and educational context for the images can be found at URL http://www.jpl.nasa.gov/galileo/sepo

  14. Rings & Arithmetic 8: Euclidean Algorithm; polynomial rings

    E-print Network

    Flynn, E. Victor

    Rings & Arithmetic 8: Euclidean Algorithm; polynomial rings Thursday, 27 October 2005 Lectures for Part A of Oxford FHS in Mathematics and Joint Schools · The euclidean algorithm · A useful general fact · The Remainder Theorem · Roots of polynomials · Factorising polynomials 0 #12;The Euclidean Algorithm Assume

  15. HST Surface Photometry of NGC 4314 - History of Star Formation in a Nuclear Ring

    Microsoft Academic Search

    G. Fritz Benedict; Andy Howell; Inger Jorgensen; Beverly J. Smith; Jeffrey D. P. Kenney

    1998-01-01

    Using HST WFPC2 images, we have derived U, B, V, I, and H-alpha photometry for 80 star clusters in the nuclear star-forming ring in the barred spiral galaxy NGC 4314. The blue colors and strong H-alpha emission for some of these clusters imply very young ages of less than 5 Myr. Further out in the galaxy, just exterior to this

  16. OBLIQUE/EXTERIOR VIEW, FRONT (NORTH) ELEVATION WITH THREE ENTRANCES TO FORMER ...

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

    OBLIQUE/EXTERIOR VIEW, FRONT (NORTH) ELEVATION WITH THREE ENTRANCES TO FORMER COMPANY MEAT, GROCERY AND DRY GOODS OPERATIONS. - Mulga Commisary, Off AL 269 at I 20-59, Birmingham, Jefferson County, AL

  17. 4. Exterior view of Systems Integration Laboratory Building (T28), looking ...

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

    4. Exterior view of Systems Integration Laboratory Building (T-28), looking northwest. - Air Force Plant PJKS, Systems Integration Laboratory, Systems Integration Laboratory Building, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

  18. 3. Exterior view of Systems Integration Laboratory Building (T28), looking ...

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

    3. Exterior view of Systems Integration Laboratory Building (T-28), looking southeast. - Air Force Plant PJKS, Systems Integration Laboratory, Systems Integration Laboratory Building, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

  19. DETAIL VIEW OF EXTERIOR SIDE OF SLIDING DOORS TO HB3, ...

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

    DETAIL VIEW OF EXTERIOR SIDE OF SLIDING DOORS TO HB-3, FACING WEST - Cape Canaveral Air Force Station, Launch Complex 39, Vehicle Assembly Building, VAB Road, East of Kennedy Parkway North, Cape Canaveral, Brevard County, FL

  20. DETAIL VIEW OF EXTERIOR SIDE OF LIFTING DOORS TO HB3, ...

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

    DETAIL VIEW OF EXTERIOR SIDE OF LIFTING DOORS TO HB-3, FACING WEST - Cape Canaveral Air Force Station, Launch Complex 39, Vehicle Assembly Building, VAB Road, East of Kennedy Parkway North, Cape Canaveral, Brevard County, FL

  1. Exterior view looking north/northwest showing water intake from Little Kanawha ...

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

    Exterior view looking north/northwest showing water intake from Little Kanawha River on right. - Burnsville Natural Gas Pumping Station, Saratoga Avenue between Little Kanawha River & C&O Railroad line, Burnsville, Braxton County, WV

  2. General exterior view looking north. Boiler house is center/left. Engine ...

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

    General exterior view looking north. Boiler house is center/left. Engine house is center right. - Burnsville Natural Gas Pumping Station, Saratoga Avenue between Little Kanawha River & C&O Railroad line, Burnsville, Braxton County, WV

  3. 9. DETAILED EXTERIOR VIEW OF WEB AT U3L3, SHOWING VERTICAL, ...

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

    9. DETAILED EXTERIOR VIEW OF WEB AT U3L3, SHOWING VERTICAL, ARCH RIB, LOWER CHORD AND WELDED/BOLTED GUSSET PLATE, LOOKING SOUTHWEST - Cottonville Bridge, County Road D-61 at Farmer's Creek, Maquoketa, Jackson County, IA

  4. Brane-world stars with a solid crust and vacuum exterior

    NASA Astrophysics Data System (ADS)

    Ovalle, Jorge; Gergely, László Á.; Casadio, Roberto

    2015-02-01

    The minimal geometric deformation approach is employed to show the existence of brane-world stellar distributions with a vacuum Schwarzschild exterior, thus without energy leaking from the exterior of the brane-world star into the extra dimension. The interior satisfies all the elementary criteria of physical acceptability for a stellar solution, namely, it is regular at the origin, the pressure and density are positive and decrease monotonically with increasing radius, and all energy conditions are fulfilled. A very thin solid crust with negative radial pressure separates the interior from the exterior, having a thickness ? inversely proportional to both the brane tension ? and the radius R of the star, i.e. {{? }-1}˜ R? . This brane-world star with Schwarzschild exterior would appear only thermally radiating to a distant observer and be fully compatible with the stringent constraints imposed on stellar parameters by observations of gravitational lensing, orbital evolutions or properties of accretion disks.

  5. 3. EXTERIOR, SOUTH REAR VIEW OF C.F. WHEELER GROCERY GARTON ...

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

    3. EXTERIOR, SOUTH REAR VIEW OF C.F. WHEELER GROCERY GARTON BAKERY AND CONFECTIONERY AND NIELSEN, GEHRKE AND HANSEN CLOTHING STORE - East Locust Street Commercial District, 521-529 East Locust Street, Des Moines, Polk County, IA

  6. 3. EXTERIOR NORTH VIEW (1992). WrightPatterson Air Force Base, ...

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

    3. EXTERIOR NORTH VIEW (1992). - Wright-Patterson Air Force Base, Area B, Building 6, Signal Corps Special Forces Hangar, On flightline at Southeast corner of Eleventh & C Streets, Dayton, Montgomery County, OH

  7. 1. EXTERIOR SOUTHEAST VIEW (1991). WrightPatterson Air Force Base, ...

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

    1. EXTERIOR SOUTHEAST VIEW (1991). - Wright-Patterson Air Force Base, Area B, Building 6, Signal Corps Special Forces Hangar, On flightline at Southeast corner of Eleventh & C Streets, Dayton, Montgomery County, OH

  8. 2. EXTERIOR NORTHWEST VIEW (1992). WrightPatterson Air Force Base, ...

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

    2. EXTERIOR NORTHWEST VIEW (1992). - Wright-Patterson Air Force Base, Area B, Building 6, Signal Corps Special Forces Hangar, On flightline at Southeast corner of Eleventh & C Streets, Dayton, Montgomery County, OH

  9. 4. EXTERIOR NORTHEAST VIEW (1992). WrightPatterson Air Force Base, ...

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

    4. EXTERIOR NORTHEAST VIEW (1992). - Wright-Patterson Air Force Base, Area B, Building 6, Signal Corps Special Forces Hangar, On flightline at Southeast corner of Eleventh & C Streets, Dayton, Montgomery County, OH

  10. Global existence of solutions for semilinear damped wave equation in 2-D exterior domain

    NASA Astrophysics Data System (ADS)

    Ikehata, Ryo

    We consider a mixed problem of a damped wave equation utt-? u+ ut=| u| p in the two dimensional exterior domain case. Small global in time solutions can be constructed in the case when the power p on the nonlinear term | u| p satisfies p ?=2exterior domain. A new device developed in Ikehata-Matsuyama (Sci. Math. Japon. 55 (2002) 33) plays an effective role.

  11. Generalized system function analysis of exterior and interior resonances of antenna and scattering problems

    Microsoft Academic Search

    Long Li; Chang-Hong Liang

    2004-01-01

    The generalized system function H(s), directly associated with radiated and scattered fields, is presented to effectively analyze the exterior and interior resonances of antenna and scattering systems in this paper. H(s) is constructed by using the model-based parameter estimation technique combined with the complex frequency theory. The behaviors of the exterior and interior resonances can be distinguished by analyzing the

  12. Optimal secondary source position in exterior spherical acoustical holophony

    NASA Astrophysics Data System (ADS)

    Pasqual, A. M.; Martin, V.

    2012-02-01

    Exterior spherical acoustical holophony is a branch of spatial audio reproduction that deals with the rendering of a given free-field radiation pattern (the primary field) by using a compact spherical loudspeaker array (the secondary source). More precisely, the primary field is known on a spherical surface surrounding the primary and secondary sources and, since the acoustic fields are described in spherical coordinates, they are naturally subjected to spherical harmonic analysis. Besides, the inverse problem of deriving optimal driving signals from a known primary field is ill-posed because the secondary source cannot radiate high-order spherical harmonics efficiently, especially in the low-frequency range. As a consequence, a standard least-squares solution will overload the transducers if the primary field contains such harmonics. Here, this is avoided by discarding the strongly decaying spherical waves, which are identified through inspection of the radiation efficiency curves of the secondary source. However, such an unavoidable regularization procedure increases the least-squares error, which also depends on the position of the secondary source. This paper deals with the above-mentioned questions in the context of far-field directivity reproduction at low and medium frequencies. In particular, an optimal secondary source position is sought, which leads to the lowest reproduction error in the least-squares sense without overloading the transducers. In order to address this issue, a regularization quality factor is introduced to evaluate the amount of regularization required. It is shown that the optimal position improves significantly the holophonic reconstruction and maximizes the regularization quality factor (minimizes the amount of regularization), which is the main general contribution of this paper. Therefore, this factor can also be used as a cost function to obtain the optimal secondary source position.

  13. Token Ring Demonstration

    NSDL National Science Digital Library

    This applet demonstrates a Token Ring. Users may add or delete stations (or computers) from the ring. The applet allows the user to show data being circulated around the ring. Users may also select to demonstrate the cases when one of the stations is switched off, or monitoring. (UNC E-Learning Grant)

  14. Planetary ring studies

    NASA Technical Reports Server (NTRS)

    Cuzzi, Jeffrey N.; Dobrovolskis, Anthony R.; Dones, Luke; Durisen, Richard H.; Horn, Linda; Showalter, Mark R.

    1991-01-01

    The following topics are covered: (1) characterization of the fine scale structure in Saturn's A and B rings; (2) ballistic transport modeling and evolution of fine ring structure; (3) faint features in the rings of Saturn; (4) the Encke moonlet; (5) dynamics in ringmoon systems; (6) a nonclassical radiative transfer model; and (7) particle properties from stellar occultation data.

  15. Differential Buffer Ring Oscillator

    E-print Network

    Ayazi, Farrokh

    Differential Buffer delay Ring Oscillator Replica-feedback current souce bias circuit VDD = 2.4 - 3. The clock generator is based on a 3-stage differential ring oscillator. The compensation technique to appropriately change the control voltage of the differential ring oscillator. Measurements made across

  16. Saturn's F-Ring

    NASA Technical Reports Server (NTRS)

    2000-01-01

    This narrow-angle camera image of Saturn's F Ring was taken through the Clear filter while at a distance of 0.75 million km from Saturn on 12 November 1980. The kinks and braids of this tightly-constrained ring are visible along with the outer edge of the A Ring. JPL managed the Voyager Project for NASA's Office of Space Science.

  17. Birth Control Ring

    MedlinePLUS

    What Is It? The birth control ring is a soft, flexible, doughnut-shaped ring about 2 inches (5 centimeters) in diameter. It is inserted into the ... of the hormones progesterone and estrogen in the birth control ring prevent ovulation (the release of an egg ...

  18. The Ring Loading Problem

    Microsoft Academic Search

    Alexander Schrijver; Paul D. Seymour; Peter Winkler

    1998-01-01

    The following problem arose in the planning of optical communications networks which use bidirectional SONET rings. Trac demands di;j are given for each pair of nodes in an n-node ring; each demand must be routed one of the two possible ways around the ring. The object is to minimize the maximum load on the cycle, where the load of an

  19. The Jumping Ring Experiment

    ERIC Educational Resources Information Center

    Baylie, M.; Ford, P. J.; Mathlin, G. P.; Palmer, C.

    2009-01-01

    The jumping ring experiment has become central to liquid nitrogen shows given as part of the outreach and open day activities carried out within the University of Bath. The basic principles of the experiment are described as well as the effect of changing the geometry of the rings and their metallurgical state. In general, aluminium rings are…

  20. On Commutative Clean Rings and pm Rings preprint version

    Microsoft Academic Search

    W. D. Burgess; R. Raphael

    Rings are assumed to be commutative. Recent work gives some of the tools needed to characterize clean, almost clean, weakly clean and uniquely clean rings by describing their Pierce sheaves. The sheaf descriptions are used to show that weakly clean and almost clean rings which are pm rings are clean. A subclass of clean rings, here called J-clean rings, also

  1. Topics in galactic dynamics

    NASA Astrophysics Data System (ADS)

    Little, Frank Blane

    1989-01-01

    The distant satellites of the Milky Way Galaxy are used to probe the distribution of dark matter in the Galactic halo. A new method of statistical analysis based on Bayes' theorem was devised, which directly yields confidence intervals for the mass of the Galaxy once the eccentricity distribution of the satellites is specified. Assuming an isotropic velocity distribution for 10 objects at distances of 50 to 140 kiloparsecs, mass results suggest that the Galaxy's massive dark halo extends to approximately less than 50 kiloparsecs from the Galactic center. A model galaxy with an artificial bar is used to explore the effect of dynamical friction on a galactic bar. An analytic formula is provided which correctly predicts angular momentum changes for a bar in interaction with a non self-gravitating disk. N-body simulations further show that disk self-gravity tends to make a bar without inner Lindblad resonances spin down more rapidly, and tends to make a bar dominated by inner Lindblad resonances spin up less rapidly. The long-term dynamical evolution of galactic bars is investigated using fully self gravitating bar-unstable disk-halo models. The models develop rapidly rotating bars which then slow down through transfers of angular momentum both to the outer disk and to the halo. The models suggest that the distance between the end of a bar and its corotation circle is proportional to the bar's age, and an approximate formula is presented which expresses this relationship. It is also concluded that the average tangential velocity within a barlike object drops by a factor of about 2 over approximately 45 initial rotation periods.

  2. Rotating Rings of Ice

    NSDL National Science Digital Library

    This is a lesson about Saturn's rings. Learners will create a three-dimensional model of Saturn and its rings. The model will show the particle nature and structure of the rings. Students also write about the model in this lesson. With the aid of a graphic organizer, students organize their thoughts, then draft and write a paragraph to explain what they know about the ring system. You will need a 2 and 1/2 inch styrofoam ball and some vermiculite for each student. This is lesson 7 of 10 in the Mission to Saturn Educators Guide, Reading Writing Rings, for grades 1-2.

  3. Radio and gamma ray evidence for a molecular-arm feature at 5 kpc from the galactic centre. [observing galactic longitude of CO emission

    NASA Technical Reports Server (NTRS)

    Solomon, P. M.; Stecker, F. W.

    1974-01-01

    Recent measurements of the galactic CO distribution as evidenced from 2.6 mm radio observations of the CO emission line intensity are correlated with the SAS-2 measurements of galactic gamma ray emission. Both distributions are indicative of a ring-shaped distribution or arm consisting of cool clouds of molecular hydrogen at a galactocentric distance of approximately 5 kpc. The mean density of H2 in this region is estimated to be between 1 and 5 cu cm. Both a galactic and extra-galactic origin of cosmic rays are consistent with the observations, although the presence of dynamical effects and increased star formation at 5 kpc in the dense molecular clouds may be connected with an increase in cosmic-ray production.

  4. Saturn's largest ring.

    PubMed

    Verbiscer, Anne J; Skrutskie, Michael F; Hamilton, Douglas P

    2009-10-22

    Most planetary rings in the Solar System lie within a few radii of their host body, because at these distances gravitational accelerations inhibit satellite formation. The best known exceptions are Jupiter's gossamer rings and Saturn's E ring, broad sheets of dust that extend outward until they fade from view at five to ten planetary radii. Source satellites continuously supply the dust, which is subsequently lost in collisions or by radial transport. Here we report that Saturn has an enormous ring associated with its outer moon Phoebe, extending from at least 128R(S) to 207R(S) (Saturn's radius R(S) is 60,330 km). The ring's vertical thickness of 40R(S) matches the range of vertical motion of Phoebe along its orbit. Dynamical considerations argue that these ring particles span the Saturnian system from the main rings to the edges of interplanetary space. The ring's normal optical depth of approximately 2 x 10(-8) is comparable to that of Jupiter's faintest gossamer ring, although its particle number density is several hundred times smaller. Repeated impacts on Phoebe, from both interplanetary and circumplanetary particle populations, probably keep the ring populated with material. Ring particles smaller than centimetres in size slowly migrate inward and many of them ultimately strike the dark leading face of Iapetus. PMID:19812546

  5. Storage Ring Revised March 1994

    E-print Network

    Brookhaven National Laboratory - Experiment 821

    Chapter 8. Storage Ring Revised March 1994 8.1. Introduction -- 107 -- #12; 108 Storage Ring 8.2. Magnetic Design and Field Calculations 8.2.1. Conceptual Approach #12; Storage Ring 109 #12; 110 Storage Ring 8.2.2. Computer Aided Refined Pole Designs #12; Storage Ring 111 #12; 112 Storage Ring #12

  6. On equiprime near-rings

    Microsoft Academic Search

    Stefan Veldsman

    1992-01-01

    An equiprime near-ring is a generalization of prime ring. Firstly some axioma-tics concerning equiprime near-rings are discussed, e.g. their relation to the other notions of primeness for near-rings, primitive near-rings and near-fields. Secondly we investigate the equiprimeness of some well-known examples of near-rings.

  7. Oral hyaline ring granuloma.

    PubMed

    Boffano, Paolo; Gallesio, Cesare; Campisi, Paola; Roccia, Fabio; Berrone, Sid

    2013-01-01

    Hyaline ring granuloma is a rare oral lesion with an unclear and controversial etiology, characterized by the presence of rings of palely eosinophilic structureless material (the so-called hyaline rings) with multinucleated giant cells around and within the very same rings.Various theories have been proposed about the pathogenesis of hyaline ring granulomas. Many authors consider a vegetable origin, suggesting that it may represent a reaction to foreign material such as food (and in particular pulses). Instead, other authors deny this possibility, proposing that the hyaline rings might represent degenerated blood vessels, degenerated collagen, or fibrosed extravasated serum proteins.The aim of this article is to present a case of hyaline ring granuloma and to briefly review the literature. PMID:23348341

  8. Planetary ring systems

    NASA Astrophysics Data System (ADS)

    Cuzzi, J.

    1983-03-01

    It is pointed out that in the last several years planetary ring studies have evolved from observations of a single example, related to Saturn, to studies of a class of objects. The rings of Uranus were discovered in 1977 by their unexpected occultations of a star. Observations of planetary rings during the time from 1979 to 1982 are largely related to space missions involving the Pioneer 11 Saturn encounter (1979), and Voyager Jupiter (1979) and Saturn (1980-81) encounters. However, ground-based observations he also played and will continue to play a major role. The rings of Saturn are discussed, taking into account structural details, particle properties, and questions concerning an existence of embedded moonlets. Details regarding Jupiter's ring and Uranus' rings are also investigated. Theoretical developments of general interest are considered, giving attention to gravitational torques, internal collective effects, and electromagnetic and erosive processes acting on ring particles.

  9. Galactic All-Sky Survey

    Microsoft Academic Search

    Naomi McClure-Griffiths; Daniel Pisano; Lister Staveley-Smith; Alyson Ford; Peter Kalberla; Leonidas Dedes; Brad Gibson; F. J. Lockman

    2006-01-01

    The Galactic All-Sky Survey (GASS) is a large scale project to produce a fully sampled survey of Galactic HI south of declination 0 degrees with 15 arcmin resolution, 1 km\\/s spectral resolution and a sensitivity limit of 70 mK. GASS will provide a dramatic improvement in resolution and sensitivity on the hugely successful Leiden-Dwingeloo and IAR surveys of Galactic HI.

  10. Planck early results. XXI. Properties of the interstellar medium in the Galactic plane

    Microsoft Academic Search

    A. Abergel; P. A. R. Ade; N. Aghanim; M. Arnaud; M. Ashdown; J. Aumont; C. Baccigalupi; A. Balbi; A. J. Banday; R. B. Barreiro; J. G. Bartlett; E. Battaner; K. Benabed; A. Benoît; J.-P. Bernard; M. Bersanelli; R. Bhatia; J. J. Bock; A. Bonaldi; J. R. Bond; J. Borrill; F. Boulanger; M. Bucher; C. Burigana; P. Cabella; J.-F. Cardoso; A. Catalano; L. Cayón; A. Challinor; A. Chamballu; L.-Y. Chiang; C. Chiang; P. R. Christensen; S. Colombi; F. Couchot; A. Coulais; B. P. Crill; F. Cuttaia; T. M. Dame; L. Danese; R. D. Davies; R. J. Davis; P. de Bernardis; G. de Gasperis; A. de Rosa; G. de Zotti; J. Delabrouille; J.-M. Delouis; F.-X. Désert; C. Dickinson; S. Donzelli; O. Doré; U. Dörl; M. Douspis; X. Dupac; G. Efstathiou; T. A. Enßlin; F. Finelli; O. Forni; M. Frailis; E. Franceschi; S. Galeotta; K. Ganga; M. Giard; G. Giardino; Y. Giraud-Héraud; J. González-Nuevo; K. M. Górski; S. Gratton; A. Gregorio; I. A. Grenier; A. Gruppuso; F. K. Hansen; D. Harrison; S. Henrot-Versillé; D. Herranz; S. R. Hildebrandt; E. Hivon; M. Hobson; W. A. Holmes; W. Hovest; R. J. Hoyland; K. M. Huffenberger; T. R. Jaffe; A. H. Jaffe; W. C. Jones; M. Juvela; E. Keihänen; R. Keskitalo; T. S. Kisner; R. Kneissl; L. Knox; H. Kurki-Suonio; G. Lagache; A. Lähteenmäki; J.-M. Lamarre; A. Lasenby; R. J. Laureijs; C. R. Lawrence; S. Leach; R. Leonardi; C. Leroy; P. B. Lilje; M. Linden-Vørnle; M. López-Caniego; P. M. Lubin; J. F. Macías-Pérez; C. J. MacTavish; B. Maffei; N. Mandolesi; R. Mann; M. Maris; D. J. Marshall; E. Martínez-González; S. Masi; S. Matarrese; F. Matthai; P. Mazzotta; P. McGehee; P. R. Meinhold; A. Melchiorri; L. Mendes; A. Mennella; M.-A. Miville-Deschênes; A. Moneti; L. Montier; G. Morgante; D. Mortlock; D. Munshi; A. Murphy; P. Naselsky; P. Natoli; C. B. Netterfield; H. U. Nørgaard-Nielsen; F. Noviello; D. Novikov; I. Novikov; S. Osborne; F. Pajot; R. Paladini; F. Pasian; G. Patanchon; O. Perdereau; L. Perotto; F. Perrotta; F. Piacentini; M. Piat; S. Plaszczynski; E. Pointecouteau; G. Polenta; N. Ponthieu; T. Poutanen; G. Prézeau; S. Prunet; J.-L. Puget; J. P. Rachen; W. T. Reach; R. Rebolo; W. Reich; C. Renault; S. Ricciardi; T. Riller; I. Ristorcelli; G. Rocha; C. Rosset; J. A. Rubiño-Martín; B. Rusholme; M. Sandri; D. Santos; G. Savini; D. Scott; M. D. Seiffert; P. Shellard; G. F. Smoot; J.-L. Starck; F. Stivoli; V. Stolyarov; R. Stompor; R. Sudiwala; J.-F. Sygnet; J. A. Tauber; L. Terenzi; L. Toffolatti; M. Tomasi; J.-P. Torre; M. Tristram; J. Tuovinen; G. Umana; L. Valenziano; J. Varis; P. Vielva; F. Villa; N. Vittorio; L. A. Wade; B. D. Wandelt; A. Wilkinson; N. Ysard; D. Yvon; A. Zacchei; A. Zonca

    2011-01-01

    Planck has observed the entire sky from 30 GHz to 857GHz. The observed foreground emission contains contributions from different phases of the interstellar medium (ISM). We have separated the observed Galactic emission into the different gaseous components (atomic, molecular and ionised) in each of a number of Galactocentric rings. This technique provides the necessary information to study dust properties (emissivity,

  11. Dust and Planetary Rings

    NASA Astrophysics Data System (ADS)

    Siddiqui, Muddassir

    ABSTRACT Space is not empty it has comic radiations (CMBR), dust etc. Cosmic dust is that type of dust which is composed of particles in space which vary from few molecules to 0.1micro metres in size. This type of dust is made up of heavier atoms born in the heart of stars and supernova. Mainly it contains dust grains and when these dust grains starts compacting then it turns to dense clouds, planetary ring dust and circumstellar dust. Dust grains are mainly silicate particles. Dust plays a major role in our solar system, for example in zodiacal light, Saturn's B ring spokes, planetary rings at Jovian planets and comets. Observations and measurements of cosmic dust in different regions of universe provide an important insight into the Universe's recycling processes. Astronomers consider dust in its most recycled state. Cosmic dust have radiative properties by which they can be detected. Cosmic dusts are classified as intergalactic dusts, interstellar dusts and planetary rings. A planetary ring is a ring of cosmic dust and other small particles orbiting around a planet in flat disc shape. All of the Jovian planets in our solar system have rings. But the most notable one is the Saturn's ring which is the brightest one. In March 2008 a report suggested that the Saturn's moon Rhea may have its own tenuous ring system. The ring swirling around Saturn consists of chunks of ice and dust. Most rings were thought to be unstable and to dissipate over course of tens or hundreds of millions of years but it now appears that Saturn's rings might be older than that. The dust particles in the ring collide with each other and are subjected to forces other than gravity of its own planet. Such collisions and extra forces tend to spread out the rings. Pluto is not known to have any ring system but some Astronomers believe that New Horizons probe might find a ring system when it visits in 2015.It is also predicted that Phobos, a moon of Mars will break up and form into a planetary ring. Many theories are present regarding the formation of rings for example when moons collide, when moon breaks up and due to dust formation in supernova. But the most important question is, that how they maintain their orbit and why they are present there.

  12. Sunset on Saturn's Rings

    NASA Technical Reports Server (NTRS)

    1996-01-01

    This is a rare view of Saturn's rings seen just after the Sun has set below the ring plane, taken with the Hubble Space Telescope on Nov. 21, 1995.

    This perspective is unusual because the Earth is slightly above (2.7 degrees latitude) Saturn's rings and the Sun is below them. Normally we see the rings fully illuminated by the Sun.

    The photograph shows three bright ring features: the F Ring, the Cassini Division, and the C Ring (moving from the outer rings to the inner). The low concentration of material in these rings allows light from the Sun to shine through them. The A and B rings are much denser, which limits the amount of light that penetrates through them. Instead, they are faintly visible because they reflect light from Saturn's disk.

    Scientists believe that the F Ring is slightly warped because it disappears part way around on the right (West) side. Hubble's high resolution shows the that A Ring's shadow obscures part of the F ring (right).

    The image was assembled from 20 exposures taken with Wide Field Planetary Camera-2 over 8 hours.

    The Wide Field/Planetary Camera 2 was developed by the Jet Propulsion Laboratory and managed by the Goddard Spaced Flight Center for NASA's Office of Space Science.

    This image and other images and data received from the Hubble Space Telescope are posted on the World Wide Web on the Space Telescope Science Institute home page at URL http://oposite.stsci.edu/pubinfo/

  13. The galactic distribution of carbon monoxide: An out-of-plane survey. Ph.D. Thesis

    NASA Technical Reports Server (NTRS)

    Cohen, R. S.

    1978-01-01

    Galactic CO line emission at 115 GHz has been surveyed. This survey confirms the finding that CO is concentrated in a ring. It provides a determination of the thickness of this molecular ring as a function of galactic radius and shows that CO is displaced from the conventional galactic plane. These results were arrived at by least-squares fitting the survey data to a circularly symmetric model of the Galaxy. A comparison of the CO and HI distributions shows that there are marked differences in the distributions of these species, both radially and out of the plane. A detailed discussion of the antenna characteristics, including the radiation pattern and pointing characteristics is presented.

  14. Implications of the IRAS data for galactic gamma ray astronomy and EGRET

    NASA Technical Reports Server (NTRS)

    Stecker, Floyd W.

    1990-01-01

    Using the results of gamma-ray, millimeter wave and far surveys of the galaxy, logically consistent picture of the large scale distribution of galactic gas and cosmic rays was derived, tied to the overall processes of stellar birth and destruction on a galactic scale. Using the results of the IRAS far-infrared survey of te galaxy, the large scale radial distributions of galactic far-infrared emission independently was obtained for both the Northern and Southern Hemisphere sides of the Galaxy. The dominant feature in these distributions was found to be a broad peak coincident with the 5 kpc molecular gas cloud ring. Evidence was found for spiral arm features. Strong correlations are evident between the large scale galactic distributions of far-infrared emission, gamma-ray emission and total CO emission. There is particularly tight correlation between the distribution of warm molecular clouds and far-infrared emission on a galactic scale. The 5 kpc ring was evident in existing galactic gamma-ray data. The extent to which the more detailed spiral arm features are evident in the more resolved EGRET (Energetic Gamma-Ray Experimental Telescope) data will help to determine more precisely the propagation characteristics of cosmic rays.

  15. Brane world black rings

    NASA Astrophysics Data System (ADS)

    Sahay, Anurag; Sengupta, Gautam

    2007-06-01

    Five dimensional neutral rotating black rings are described from a Randall-Sundrum brane world perspective in the bulk black string framework. To this end we consider a rotating black string extension of a five dimensional black ring into the bulk of a six dimensional Randall-Sundrum brane world with a single four brane. The bulk solution intercepts the four brane in a five dimensional black ring with the usual curvature singularity on the brane. The bulk geodesics restricted to the plane of rotation of the black ring are constructed and their projections on the four brane match with the usual black ring geodesics restricted to the same plane. The asymptotic nature of the bulk geodesics are elucidated with reference to a bulk singularity at the AdS horizon. We further discuss the description of a brane world black ring as a limit of a boosted bulk black 2 brane with periodic identification.

  16. The ring laser gyro

    Microsoft Academic Search

    W. W. Chow; J. Gea-Banacloche; L. M. Pedrotti; V. E. Sanders; W. Schleich; M. O. Scully

    1985-01-01

    This paper presents a review of both active and passive ring laser devices. The operating principles of the ring laser are developed and discussed, with special emphasis given to the problems associated with the achievement of greater sensitivity and stability. First-principle treatments of the nature of quantum noise in the ring laser gyro and various methods designed to avoid low-rotation-rate

  17. The Planetary Rings Node

    NSDL National Science Digital Library

    The Planetary Rings Node of the Planetary Data System is devoted to archiving, cataloging and distributing scientific data sets relevant to planetary ring systems. In addition to data sets, this site offers on-line tools for planning, acquiring and interpreting ring observations and downloadable routines for calculations of orbital motion and time conversions. There are also images, animations and artwork of Jupiter, Saturn, Uranus, and Neptune.

  18. Evaluating an Exterior Insulation and Finish System for Deep Energy Retrofits

    SciTech Connect

    Dentz, J.; Podorson, D.

    2014-01-01

    Exterior insulation and finish systems (EIFS) are proprietary synthetic formulations that are applied to the exterior walls of buildings to serve as insulation and exterior cladding. The insulation thickness can vary from less than one inch to a foot or more. In this project the applicability of EIFS for residential deep energy retrofits was investigated through modeling and a case study home. The home was retrofitted using a site-applied four-inch-thick EIFS. Site-specific details were developed as required for the residential retrofit application. Site work and the costs of the EIFS system were documented. The demonstration home was modeled using Building Energy Optimization energy and cost analysis software to explore cost effectiveness of various EIFS insulation thicknesses in two climate locations.

  19. Star formation and stellar populations across nuclear rings in galaxies

    E-print Network

    M. Sarzi; E. L. Allard; J. H. Knapen; L. M. Mazzuca

    2007-07-04

    (Abridged) We present a study of the optical spectra of a sample of eight star-forming nuclear rings and the nuclei of their host galaxies. The spectra were obtained with the ISIS spectrograph on the William Herschel Telescope and cover a wide range in wavelength, enabling the measurement of several stellar absorption features and gas emission lines. We compared the strength of the absorption lines to a variety of population synthesis models for the star-formation history in the nuclear rings, including also the contribution of the older bulge and disc stellar components. We find that the stars in our sample of nuclear rings have most likely formed over a prolonged period of time characterised by episodic bursts of star-formation activity. Constant star formation is firmly ruled out by the data, whereas a one-off formation event is an unlikely explanation for a common galactic component such as nuclear rings. We have used emission-line measurements to constrain the physical conditions of the ionised gas within the rings. Emission in all nuclear rings originates from HII-regions with electron densities typical for these kinds of objects, and that the rings are characterised by values for the gas metallicity ranging from slightly below to just above solar. As 20% of nearby spiral galaxies hosts nuclear rings that are currently forming massive stars, our finding of an episodic star formation history in nuclear rings implies that a significant population remains to be identified of young nuclear rings that are not currently in a massive star formation phase.

  20. Telemetry carrier ring and support

    NASA Technical Reports Server (NTRS)

    Wakeman, Thomas G. (Inventor)

    1992-01-01

    A telemetry carrier ring for use in a gas turbine engine includes an annular support ring connected to the engine and an annular carrier ring coupled to the support ring, each ring exhibiting different growth characteristics in response to thermal and mechanical loading. The carrier ring is coupled to the support ring by a plurality of circumferentially spaced web members which are relatively thin in an engine radial direction to provide a predetermined degree of radial flexibility. the web members have a circumferential width and straight axial line of action selected to transfer torque and thrust between the support ring and the carrier ring without substantial deflection. The use of the web members with radial flexibility provides compensation between the support ring and the carrier ring since the carrier ring grows at a different rate than the supporting ring.

  1. The Population of Propellers in Saturn's A Ring

    NASA Astrophysics Data System (ADS)

    Tiscareno, Matthew S.; Burns, Joseph A.; Hedman, Matthew M.; Porco, Carolyn C.

    2008-03-01

    We present an extensive data set of ~150 localized features from Cassini images of Saturn's A ring, a third of which are demonstrated to be persistent by their appearance in multiple images, and half of which are resolved well enough to reveal a characteristic "propeller" shape. We interpret these features as the signatures of small moonlets embedded within the ring, with diameters between 40 and 500 m. The lack of significant brightening at high phase angle indicates that they are likely composed primarily of macroscopic particles, rather than dust. With the exception of two features found exterior to the Encke Gap, these objects are concentrated entirely within three narrow (~1000 km) bands in the mid-A ring that happen to be free from local disturbances from strong density waves. However, other nearby regions are similarly free of major disturbances but contain no propellers. It is unclear whether these bands are due to specific events in which a parent body or bodies broke up into the current moonlets, or whether a larger initial moonlet population has been sculpted into bands by other ring processes.

  2. The population of propellers in Saturn's A Ring

    E-print Network

    Matthew S. Tiscareno; Joseph A. Burns; Matthew M. Hedman; Carolyn C. Porco

    2007-12-12

    We present an extensive data set of ~150 localized features from Cassini images of Saturn's Ring A, a third of which are demonstrated to be persistent by their appearance in multiple images, and half of which are resolved well enough to reveal a characteristic "propeller" shape. We interpret these features as the signatures of small moonlets embedded within the ring, with diameters between 40 and 500 meters. The lack of significant brightening at high phase angle indicates that they are likely composed primarily of macroscopic particles, rather than dust. With the exception of two features found exterior to the Encke Gap, these objects are concentrated entirely within three narrow (~1000 km) bands in the mid-A Ring that happen to be free from local disturbances from strong density waves. However, other nearby regions are similarly free of major disturbances but contain no propellers. It is unclear whether these bands are due to specific events in which a parent body or bodies broke up into the current moonlets, or whether a larger initial moonlet population has been sculpted into bands by other ring processes.

  3. Saturn's dynamic D ring

    NASA Astrophysics Data System (ADS)

    Hedman, Matthew M.; Burns, Joseph A.; Showalter, Mark R.; Porco, Carolyn C.; Nicholson, Philip D.; Bosh, Amanda S.; Tiscareno, Matthew S.; Brown, Robert H.; Buratti, Bonnie J.; Baines, Kevin H.; Clark, Roger

    2007-05-01

    The Cassini spacecraft has provided the first clear images of the D ring since the Voyager missions. These observations show that the structure of the D ring has undergone significant changes over the last 25 years. The brightest of the three ringlets seen in the Voyager images (named D72), has transformed from a narrow, <40-km wide ringlet to a much broader and more diffuse 250-km wide feature. In addition, its center of light has shifted inwards by over 200 km relative to other features in the D ring. Cassini also finds that the locations of other narrow features in the D ring and the structure of the diffuse material in the D ring differ from those measured by Voyager. Furthermore, Cassini has detected additional ringlets and structures in the D ring that were not observed by Voyager. These include a sheet of material just interior to the inner edge of the C ring that is only observable at phase angles below about 60°. New photometric and spectroscopic data from the ISS (Imaging Science Subsystem) and VIMS (Visual and Infrared Mapping Spectrometer) instruments onboard Cassini show the D ring contains a variety of different particle populations with typical particle sizes ranging from 1 to 100 microns. High-resolution images reveal fine-scale structures in the D ring that appear to be variable in time and/or longitude. Particularly interesting is a remarkably regular, periodic structure with a wavelength of ˜30 km extending between orbital radii of 73,200 and 74,000 km. A similar structure was previously observed in 1995 during the occultation of the star GSC5249-01240, at which time it had a wavelength of ˜60 km. We interpret this structure as a periodic vertical corrugation in the D ring produced by differential nodal regression of an initially inclined ring. We speculate that this structure may have formed in response to an impact with a comet or meteoroid in early 1984.

  4. First Principles Study of Double Photoionization of H2 UsingExterior Complex Scaling

    SciTech Connect

    Rescigno, Thomas N.; Vanroose, Wim; Horner, Daniel A.; Martin,Fernando; McCurdy, C. William

    2006-07-21

    Exterior complex scaling provides a practical path forfirst-principles studies of atomic and molecular ionizationproblemssince it avoids explicit enforcement of asymptotic boundary conditionsfor 3-body Coulomb breakup. We have used the method of exterior complexscaling, implemented with both the discrete variable representation andB-splines, to obtain the first-order wave function for molecular hydrogencorresponding to a single photon having been absorbed by a correlatedinitial state. These wave functions are used to construct convergedtriple differential cross sections for double photoionization of alignedH2 molecules.

  5. Application of exterior complex scaling to positron-hydrogencollisions including rearrangement

    SciTech Connect

    Bartlett, Philip L.; Stelbovics, Andris T.; Rescigno, Thomas N.; McCurdy, C. William

    2007-12-06

    The first application of an exterior complex scaling method to an atomic scattering problem with distinct rearrangement channels is reported. Calculations are performed for positron-hydrogen collisions in an s-wave model employing an electron-positron potential of V{sub 12} = -(8+(r{sub 1}-r{sub 2}){sup 2}){sup 1/2}, using the time-independent propagating exterior complex scaling (PECS) method. This potential has the correct long-range Coulomb tail of the full problem and the results demonstrate that ECS-based methods can accurately calculate scattering, ionization and positronium formation cross sections in this three-body rearrangement collision.

  6. Use of modified smooth exterior scaling method as an absorbing potential and its application

    SciTech Connect

    Kalita, Dhruba J.; Gupta, Ashish K. [Department of Chemistry, Indian Institute of Technology, Guwahati 781039, Assam (India)

    2011-03-07

    Here, we propose a new complex path to achieve better absorption during the propagation of a wavepacket. In the proposed modified smooth exterior scaling (SES) method, scaling function, {theta}(x), has been chosen as a real function rather than complex (as used in a conventional smooth exterior scaling method). It greatly reduces the artificial reflections from the boundary edges. This modified SES method is applied to study the multiphoton dissociation of H{sub 2}{sup +} in intense laser field. The resonance states are calculated accurately.

  7. Ring chromosome instability evaluation in six patients with autosomal rings.

    PubMed

    Sodré, C P; Guilherme, R S; Meloni, V F A; Brunoni, D; Juliano, Y; Andrade, J A D; Belangero, S I N; Christofolini, D M; Kulikowski, L D; Melaragno, M I

    2010-01-01

    Ring chromosomes are often associated with abnormal phenotypes due to loss of genomic material and also because of ring instability at mitosis after sister chromatid exchange events. We investigated ring chromosome instability in six patients with ring chromosomes 4, 14, 15, and 18 by examining 48- and 72-h lymphocyte cultures at the first, second and subsequent cell divisions after bromodeoxyuridine incorporation. Although most cells from all patients showed only one monocentric ring chromosome, ring chromosome loss and secondary aberrations were observed both in 48- and 72-h lymphocyte cultures and in metaphase cells of the different cell generations. We found no clear-cut correlation between ring size and ring instability; we also did not find differences between apparently complete rings and rings with genetic material loss. The cytogenetic findings revealed secondary aberrations in all ring chromosome patients. We concluded that cells with ring chromosome instability can multiply and survive in vivo, and that they can influence the patient's phenotype. PMID:20198569

  8. Galactic Hearts of Glass

    NASA Technical Reports Server (NTRS)

    2006-01-01

    [figure removed for brevity, see original site] Click on image for larger graph

    This artist's concept shows delicate greenish crystals sprinkled throughout the violent core of a pair of colliding galaxies. The white spots represent a thriving population of stars of all sizes and ages. NASA's Spitzer Space Telescope detected more than 20 bright and dusty galactic mergers like the one depicted here, all teeming with the tiny gem-like crystals.

    When galaxies collide, they trigger the birth of large numbers of massive stars. Astronomers believe these blazing hot stars act like furnaces to produce silicate crystals in the same way that glass is made from sand. The stars probably shed the crystals as they age, and as they blow apart in supernovae explosions.

    At the same time the crystals are being churned out, they are also being destroyed. Fast-moving particles from supernova blasts easily convert silicates crystals back to their amorphous, or shapeless, form.

    How is Spitzer seeing the crystals if they are rapidly disappearing? Astronomers say that, for a short period of time at the beginning of galactic mergers, massive stars might be producing silicate crystals faster than they are eliminating them. When our own galaxy merges with the Andromeda galaxy in a few billion years, a similar burst of massive stars and silicate crystals might occur.

    Crystal Storm in Distant Galaxy The graph (see inset above) of infrared data from NASA's Spitzer Space Telescope tells astronomers that a distant galaxy called IRAS 08752+3915 is experiencing a storm of tiny crystals made up of silicates. The crystals are similar to the glass-like grains of sand found on Earth's many beaches.

    The data were taken by Spitzer's infrared spectrograph, which splits light open to reveal its rainbow-like components. The resulting spectrum shown here reveals the signatures of both crystalline (green) and non-crystalline (brown) silicates.

    Spitzer detected the same crystals in 20 additional galaxies, all belonging to a class called ultraluminous infrared galaxies. These extremely bright and dusty galaxies usually consist of two galaxies in the process of smashing into each other. Astronomers believe massive stars at the hearts of the galaxies are churning out clouds of silicate crystals. This phenomenon may represent a short-lived phase in the evolution of galactic mergers.

  9. Contactless Magnetic Slip Ring

    NASA Technical Reports Server (NTRS)

    Kumagai, Hiroyuki (Inventor); Deardon, Joe D. (Inventor)

    1997-01-01

    A contactless magnetic slip ring is disclosed having a primary coil and a secondary coil. The primary and secondary coils are preferably magnetically coupled together, in a highly reliable efficient manner, by a magnetic layered core. One of the secondary and primary coils is rotatable and the contactless magnetic slip ring provides a substantially constant output.

  10. Syzygies and Gorenstein rings

    Microsoft Academic Search

    Mitsuo Hoshino

    1990-01-01

    In this note, we are mainly concerned with syzygies and develop the author's earlier work [8]. We will show that a commutative noetherian ring A is a Gorenstein ring if and only if, for all i > 1, the class of all finitely generated A-modules which are ith syzygies is closed under extensions. Our argument is rather different from that

  11. Improved gas ring laser

    NASA Technical Reports Server (NTRS)

    Coccoli, J. D.; Lawson, J. R.

    1968-01-01

    Minimizing mode coupling improves sensing resolution of a gas ring laser in a gimballess gyroscope system or inertial rotation sensor. The piezoelectric-driven corner mirrors of the ring laser are oscillated in a direction parallel to their surfaces and the plane of rotation.

  12. The contractile ring

    Microsoft Academic Search

    Thomas E. Schroeder

    1970-01-01

    Techniques of individual cell selection and precise ultramicrotomy have been employed to demonstrate that the contractile ring of cleaving HeLa cells is a transitory cytoplasmic organelle of distinctive fine structure and location. The contractile ring is an uninterrupted annulus encircling the equator of dividing cells exactly where the cleavage furrow forms. It is about 10 microns wide, up to 0.2

  13. Child sex rings

    Microsoft Academic Search

    N J Wild; J M Wynne

    1986-01-01

    Details of 11 child sex rings identified in one working class community were obtained by interviewing investigating police officers and examining health and social services records. The rings contained 14 adult male perpetrators and 175 children aged 6-15 years. Most perpetrators used child ringleaders to recruit victims; others became a \\

  14. Tree ring analysis

    Microsoft Academic Search

    Hayet Laggoune; Sarifuddin; V. Guesdon

    2005-01-01

    Tree ring analysis provides useful data for dendrochnologists that can help them for better understanding of climatic and environmental changes. Yet detection and counting of rings in cross section of tree were realized manually which is time consuming and tedious work. Our research was motivated by the need of a fast and accurate method. This paper describes a semi automatic

  15. Smoke Ring Physics

    ERIC Educational Resources Information Center

    Huggins, Elisha

    2011-01-01

    The behavior of smoke rings, tornados, and quantized vortex rings in superfluid helium has many features in common. These features can be described by the same mathematics we use when introducing Ampere's law in an introductory physics course. We discuss these common features. (Contains 7 figures.)

  16. The Fermilab recycler ring

    SciTech Connect

    Martin Hu

    2001-07-24

    The Fermilab Recycler is a permanent magnet storage ring for the accumulation of antiprotons from the Antiproton Source, and the recovery and cooling of the antiprotons remaining at the end of a Tevatron store. It is an integral part of the Fermilab III luminosity upgrade. The following paper describes the design features, operational and commissioning status of the Recycler Ring.

  17. Tree Rings as Environmental

    E-print Network

    Grissino-Mayer, Henri D.

    359 Tree Rings as Environmental Indicators year to year throughout the life of a tree. This pattern, recog- nized that trees form new rings of growth each year, but the modern development. Because he knew that plant growth was affected by changes in cli- mate, he thought that the size of a tree

  18. Illustration of Saturn's Rings

    NASA Technical Reports Server (NTRS)

    2001-01-01

    This illustration shows a close-up of Saturn's rings. These rings are thought to have formed from material that was unable to form into a Moon because of tidal forces from Saturn, or from a Moon that was broken up by Saturn's tidal forces.

  19. Jupiter's Rings: Sharpest View

    NASA Technical Reports Server (NTRS)

    2007-01-01

    The New Horizons spacecraft took the best images of Jupiter's charcoal-black rings as it approached and then looked back at Jupiter. The top image was taken on approach, showing three well-defined lanes of gravel- to boulder-sized material composing the bulk of the rings, as well as lesser amounts of material between the rings. New Horizons snapped the lower image after it had passed Jupiter on February 28, 2007, and looked back in a direction toward the sun. The image is sharply focused, though it appears fuzzy due to the cloud of dust-sized particles enveloping the rings. The dust is brightly illuminated in the same way the dust on a dirty windshield lights up when you drive toward a 'low' sun. The narrow rings are confined in their orbits by small 'shepherding' moons.

  20. Radially truncated galactic discs

    E-print Network

    Richard de Grijs; Michiel Kregel; Karen H. Wesson

    2001-02-02

    We present the first results of a systematic analysis of radially truncated exponential discs for four galaxies of a complete sample of disc-dominated edge-on spiral galaxies. The discs of our sample galaxies are truncated at similar radii on either side of their centres. With possible the exception of the disc of ESO 416-G25, it appears that the truncations in our sample galaxies are closely symmetric, in terms of both their sharpness and the truncation length. However, the truncations occur over a larger region and not as abruptly as found in previous studies. We show that the truncated luminosity distributions of our sample galaxies, if also present in the mass distributions, comfortably meet the requirements for longevity. The formation and maintenance of disc truncations are likely closely related to stability requirements for galactic discs.

  1. Galactic antiprotons from photinos

    NASA Technical Reports Server (NTRS)

    Stecker, F. W.; Rudaz, S.; Walsh, T. F.

    1985-01-01

    Stable photinos, the photino being the supersymmetry partner of the photon, can explain both the 'missing mass' in galactic halos and the cosmic-ray antiproton spectrum up to the highest energies observed so far. This requires a photino mass around 15 GeV; significantly higher masses are cosmologically disfavored. As a consequence, the observed cosmic-ray antiproton-to-proton ratio is predicted to decrease abruptly just above the measured energy range, at E = m(x). If observed, this striking effect would strongly support the hypothesis that photinos make up the missing matter in the galaxy and also lead to a measurement of the photino mass from cosmic-ray data.

  2. Rings & Arithmetic 7: Arithmetic in euclidean rings

    E-print Network

    Flynn, E. Victor

    property · Important corollaries · Uniqueness of factorisation · The euclidean algorithm 0 #12;Simple facts, a2, . . . , ak in R, and u U(R) such that a = u a1 a2 · · · ak . Proof. 1 #12;Ideals in euclidean in a euclidean ring is principal. Proof. Note: an integral domain in which every ideal is principal is known

  3. The Galactic Bulge

    NASA Astrophysics Data System (ADS)

    Rich, R. M.

    2015-05-01

    Observations at Cerro Tololo Inter-American Observatory (CTIO) have had a critical formative impact on the study of the Galactic bulge, much of the work being inspired and supported by Victor Blanco and collaborators, which is presented in a historical overview. Recent observations at CTIO include the Blanco 4m/Hydra Bulge Radial Velocity Assay (BRAVA) that has mapped the Galactic bulge velocity field from –10

  4. Great Galactic Buddies

    NASA Technical Reports Server (NTRS)

    2006-01-01

    [figure removed for brevity, see original site] Click on image for poster [figure removed for brevity, see original site] [figure removed for brevity, see original site] [figure removed for brevity, see original site] [figure removed for brevity, see original site] 8.15 Billion Lightyears8.59 Billion Lightyears8.98 Billion Lightyears 9.09 Billion Lightyears

    Like great friends, galaxies stick together. Astronomers using NASA's Spitzer Space Telescope have spotted a handful of great galactic pals bonding back when the universe was a mere 4.6 billion years old. The universe is believed to be 13.7 billion years old.

    Collectively, these great galactic buddies are called galaxy clusters. A typical galaxy cluster can contain hundreds of galaxies and trillions of stars.

    In this false-color composite, some of the oldest galaxy clusters in the universe pose for Spitzer's infrared array camera. The individual galaxies that make up the distant clusters are shown as red dots in all four images.

    The green blobs are Milky Way stars along the line of sight, and the blue specks are faint galaxies at various distances along the line of sight. The green and blue data are from a visible-light, ground-based telescope.

    The cluster at 9.1 billion light-years away (lower right panel) is currently the most distant galaxy cluster ever detected.

    These images are three-color composites, in which blue represents visible light with a wavelength of 0.4 microns, and green indicates visible light of 0.8 microns. The visible data were captured by the ground-based Mosaic I camera at the Kitt Peak National Observatory in Tucson, Ariz. Red represents infrared light of 4.5 microns, captured by Spitzer's infrared array camera.

  5. 46 CFR 32.56-21 - Openings in exterior boundaries: Accommodation, service, and control spaces-T/ALL.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 2010-10-01 false Openings in exterior boundaries: Accommodation...After January 1, 1975 § 32.56-21 Openings in exterior boundaries: Accommodation...spaces, except wheelhouses, must have no openings, and portlights must be of a...

  6. 5^ EDITION september 2014 O.C. OPEN CITY -From landscape to exterior design POLITECNICO DI MILANO

    E-print Network

    Picasso, Marco

    5^ EDITION september 2014 O.C. OPEN CITY - From landscape to exterior design POLITECNICO DI MILANO CITY' From landscape to exterior design PRESENTATION - AN INTERNATIONAL SUMMER SCHOOL Since 2002). The academic curriculum of the first three years aims at training designers with a specific sensitivity

  7. Physical Structure of Small Wolf-Rayet Ring Nebulae

    E-print Network

    You-Hua Chu; Kerstin Weis; Donald R. Garnett

    1998-12-03

    We have selected the seven most well-defined WR ring nebulae in the LMC (Br 2, Br 10, Br 13, Br 40a, Br 48, Br 52, and Br 100) to study their physical nature and evolutionary stages. New CCD imaging and echelle observations have been obtained for five of these nebulae; previous photographic imaging and echelle observations are available for the remaining two nebulae. Using the nebular dynamics and abundances, we find that the Br 13 nebula is a circumstellar bubble, and that the Br 2 nebula may represent a circumstellar bubble merging with a fossil main-sequence interstellar bubble. The nebulae around Br 10, Br 52, and Br 100 all show influence of the ambient interstellar medium. Their regular expansion patterns suggest that they still contain significant amounts of circumstellar material. Their nebular abundances would be extremely interesting, as their central stars are WC5 and WN3-4 stars whose nebular abundances have not been derived previously. Intriguing and tantalizing implications are obtained from comparisons of the LMC WR ring nebulae with ring nebulae around Galactic WR stars, Galactic LBVs, LMC LBVs, and LMC BSGs; however, these implications may be limited by small-number statistics. A SNR candidate close to Br 2 is diagnosed by its large expansion velocity and nonthermal radio emission. There is no indication that Br 2's ring nebula interacts dynamically with this SNR candidate.

  8. New Planetary Nebulae in the Northern Galactic Plane

    E-print Network

    Panayotis Boumis; Myfanwy Bryce

    2003-11-25

    We present deep Halpha+[N II] CCD images of selected new Planetary Nebulae (PNe) discovered through an [O III] 5007 A emission line survey in the Galactic Bulge region with l > 0 deg. In total, we detected more than 200 objects, including 45 new PNe. Deep Halpha+[N II] CCD images as well as low resolution spectra were obtained for the new PNe in order to study them in detail. Their first morphological study suggests that most of them are round (60%), while 31% and 9% are elliptical and bipolar, respectively. 63% of the round PNe present ring-like structure while 37% are compact.

  9. Dynamics of the Uranian Rings

    NASA Technical Reports Server (NTRS)

    Dermott, S. F.

    1984-01-01

    Some of the problems of the shepherding satellite model of Goldreich ant tremaine are discussed. The following topics are studied: (1) optical depths of the all the observed narrow rings; (2) satellite and ring separation timescales; (3) ring edge sharpness; (4) shock formation in narrow rings; (5) the existence of small satellites near the Uranian rings; and (6) the apse and node alignments of the eccentric and inclined rings.

  10. Extrasolar Planets: A Galactic Perspective

    E-print Network

    I. N. Reid

    2006-08-15

    The host stars of extrasolar planets tend to be metal-rich. We have examined the data for these stars for evidence of trends in other galactic parameters, without success. However, several ESP hosts are likely to be members of the thick disk population, indicating that planet formation has occurred throughout the full lifetime of the Galactic disk. We briefly consider the radial metallicity gradient and age-metallicity relation of the Galactic disk, and complete a back-of-the envelope estimate of the likely number of solar-type stars with planetary companions with 6 < R < 10 kpc.

  11. The end of the Galactic spectrum

    E-print Network

    C. De Donato; G. A. Medina-Tanco

    2007-10-18

    We use a diffusion galactic model to analyze the end of the Galactic cosmic ray spectrum and its mixing with the extragalactic cosmic ray flux. We analyze the transition between Galactic and extragalactic components using two different extragalactic models. We compare the sum of the diffusive galactic spectrum and extragalactic spectrum with the available experimental data.

  12. Diffusion phenomenon for linear dissipative wave equations in an exterior domain

    NASA Astrophysics Data System (ADS)

    Ikehata, Ryo

    Under the general condition of the initial data, we will derive the crucial estimates which imply the diffusion phenomenon for the dissipative linear wave equations in an exterior domain. In order to derive the diffusion phenomenon for dissipative wave equations, the time integral method which was developed by Ikehata and Matsuyama (Sci. Math. Japon. 55 (2002) 33) plays an effective role.

  13. Shape-selective n-alkane hydroconversion at exterior zeolite surfaces

    Microsoft Academic Search

    Theo L. M. Maesen; Rajamani Krishna; Jasper M. van Baten; Berend Smit; Sofia Calero; Juan Manuel Castillo Sanchez

    2008-01-01

    A critical review of the adsorption and catalysis of n- and methylalkanes demonstrates that the interior surface of TON- and MTT-type zeolites dominates both adsorption and catalysis, and that the contribution from the exterior surface is negligible. For both n- and methylalkane isomers, the experimental Henry constants at the interior TON-type zeolite surface are more than an order of magnitude

  14. LA POLTICA EXTERIOR DE ESPAA HACIA BRASIL: DE LA MUTUA IRRELEVANCIA A LA RELACIN ESTRATGICA

    E-print Network

    Paris-Sud XI, Université de

    LA POLÍTICA EXTERIOR DE ESPAÑA HACIA BRASIL: DE LA MUTUA IRRELEVANCIA A LA RELACIÓN ESTRATÉGICA. Investigador posdoctoral MEC en la Universidad de São Paulo. Brasil. brunespa@gmail.com RESUMEN: El estudio de las relaciones entre España y Brasil constituye una de las lagunas más destacadas en la historiografia

  15. Fear of Crime in Relation to Three Exterior Site FeaturesProspect, Refuge, and Escape

    Microsoft Academic Search

    Bonnie S. Fisher; Jack L. Nasar

    1992-01-01

    This article examines fear of crime in relation to exterior site features on a college campus. The authors propose and test a theoretical model that posits that places that afford offenders refuge, and victims limited prospect and escape, will be seen as unsafe. In three studies, the authors observed behavior, obtained responses to site plans and on-site responses to perceptions

  16. 2. Exterior view of Systems Integration Laboratory Building (T28), looking ...

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

    2. Exterior view of Systems Integration Laboratory Building (T-28), looking southwest. The low-lying concrete Signal Transfer Building (T-28A) is located in the immediate foreground. - Air Force Plant PJKS, Systems Integration Laboratory, Systems Integration Laboratory Building, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

  17. Introduction This work is concerned with the exterior structural acoustics problem involving the

    E-print Network

    Thompson, Lonny L.

    Chapter 1 Introduction This work is concerned with the exterior structural acoustics problem involving the interaction of vibrating structures submerged in an infinite acoustic fluid and requires solution of the coupled wave equation subject to a far­field radiation condition. The acoustic fluid

  18. 3. Exterior view of Components Test Laboratory (T27), looking southeast. ...

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

    3. Exterior view of Components Test Laboratory (T-27), looking southeast. The building wing on the left houses the equipment room, and that on the right houses Test Cell 8 (oxidizer) and the oxidizer storage pit or vault. - Air Force Plant PJKS, Systems Integration Laboratory, Components Test Laboratory, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

  19. 7. Exterior view of Components Test Laboratory (T27), looking south. ...

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

    7. Exterior view of Components Test Laboratory (T-27), looking south. The wing in the immediate foreground houses the equipment room. - Air Force Plant PJKS, Systems Integration Laboratory, Components Test Laboratory, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

  20. 2. Exterior view of Components Test Laboratory (T27), looking southeast. ...

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

    2. Exterior view of Components Test Laboratory (T-27), looking southeast. The building wing on the left houses the equipment room and that on the right houses Test Cell 8 (oxidizer) and the oxidizer storage pit or vault. - Air Force Plant PJKS, Systems Integration Laboratory, Components Test Laboratory, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

  1. Two-photon double ionization of H2 using exterior complex scaling

    SciTech Connect

    Horner, Daniel A [Los Alamos National Laboratory; Morales, F [UNIV AUTONOMA DE MADRID; Martin, F [UNIV AUTONOMA DE MADRID; Rescigno, T N [LBNL; Mccurdy, C W [LBNL

    2009-03-09

    We report converged calculations of fully, singly differential and total cross sections for two-photon double ionization of the hydrogen molecule in the range of 26-30 eV. These results have been obtained by using the method of exterior complex scaling combined with the use of DVR basis set.

  2. Exterior oblique view of typical 3rd floor balcony at west ...

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

    Exterior oblique view of typical 3rd floor balcony at west side and east end of Building 6, from landing of stair no. 1, looking south-southeast - North Beach Place, 401 Bay Street, 500 Francisco Street, 401 Bay Street, 500 Francisco Street, San Francisco, San Francisco County, CA

  3. On boundary value problems for the domain exterior to a thin or slender region

    Microsoft Academic Search

    Dorel Homentcovschi

    1983-01-01

    In this paper a method for obtaining uniformly valid asymptotic expansions of the solution of the boundary value problems in domains exterior to thin or slender regions is given. This approach combines the Tuck's method, based on the use of a suitable co-ordinates system with the method given by Handelsman and Keller yielding complete uniform asymptotic expansion of the solution

  4. Integral equations with modified fundamental solutions for exterior boundary value problems from electromagnetic wave theory

    Microsoft Academic Search

    Gabrielle Jost

    1986-01-01

    The application of the method of the modified fundamental solution of integral equations to exterior boundary value problems from the theory of electromagnetic waves was investigated. The modification of the fundamental solution for the scalar Helmholtz equation is presented. It is shown that this solution can be considered as a dyadic. The existence proofs for three electromagnetic boundary value problems

  5. The Moon's influence on the location of the Sun-Earth exterior libration point

    Microsoft Academic Search

    Robert W. Farquhar

    1970-01-01

    If the Sun and Earth were isolated in space, the exterior libration point (Lz) of this two-body system would always lie on a line passing through their centers. However, it will be shown below that when the gravitational field of the Moon is taken into account, it is more accurate to place this point on a line that passes through

  6. Initial and Long-Term Movement of Cladding Installed Over Exterior Rigid Insulation

    SciTech Connect

    Baker, P.

    2014-09-01

    Changes in the International Energy Conservation Code (IECC) from 2009 to 2012 have resulted in the use of exterior rigid insulation becoming part of the prescriptive code requirements. With more jurisdictions adopting the 2012 IECC builders are going to finding themselves required to incorporate exterior insulation in the construction of their exterior wall assemblies. For thick layers of exterior insulation (levels greater than 1.5 inches), the use 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. However, there has been a significant resistance to its widespread implementation due to a lack of research and understanding of the mechanisms involved and potential creep effects of the assembly under the sustained dead load of a cladding. This research was an extension on previous research conducted by BSC in 2011, and 2012. Each year the understanding of the system discrete load component interactions, as well as impacts of environmental loading has increased. The focus of the research was to examine more closely the impacts of screw fastener bending on the total system capacity, effects of thermal expansion and contraction of materials on the compressive forces in the assembly, as well as to analyze a full years worth of cladding movement data from assemblies constructed in an exposed outdoor environment.

  7. A&M. Jet engine test building (TAN609). Exterior. Equipment inside rollup ...

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

    A&M. Jet engine test building (TAN-609). Exterior. Equipment inside roll-up door is blowdown test facility, part of loft-semiscale program. Note width of central section serving as blast protection for operator on left side. Photographer: Cahoon. Date: July 22, 1965. INEEL negative no. 65-3703 - Idaho National Engineering Laboratory, Test Area North, Scoville, Butte County, ID

  8. Estimating building floor-plans from exterior using laser Matthew Johnston and Avideh Zakhor

    E-print Network

    Zakhor, Avideh

    a laser range scanner on a tripod inside the structure, and conduct a scan to build a 3D model.1 While robot equipped with a rotating laser scanner to construct 3D map of indoor environments.3 Jo et al. alsoEstimating building floor-plans from exterior using laser scanners Matthew Johnston and Avideh

  9. Exterior view looking north/northeast with pumphouse in the center background. ...

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

    Exterior view looking north/northeast with pumphouse in the center background. Piping in left foreground carries gas from other equitable facilities that is being pumped along the equitable system by the Burnsville Station. - Burnsville Natural Gas Pumping Station, Saratoga Avenue between Little Kanawha River & C&O Railroad line, Burnsville, Braxton County, WV

  10. EXTERIOR VIEW LOOKING NORTH/NORTHEAST WITH PUMPHOUSE IN THE CENTER BACKGROUND. ...

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

    EXTERIOR VIEW LOOKING NORTH/NORTHEAST WITH PUMPHOUSE IN THE CENTER BACKGROUND. PIPING IN LEFT FOREGROUND CARRIES GAS FROM OTHER EQUITABLE FACILITIES THAT IS BEING PUMPED ALONG THE EQUITABLE SYSTEM BY THE BURNSVILLE STATION. - Burnsville Natural Gas Pumping Station, Saratoga Avenue between Little Kanawha River & C&O Railroad line, Burnsville, Braxton County, WV

  11. Sustainable wall construction and exterior insulation retrofit technology process and structure

    DOEpatents

    Vohra, Arun (Bethesda, MD)

    2000-01-01

    A low-cost process for exterior wall insulation retrofit, or new wall construction by stacking layers of fabric tube filled with insulating material against a wall and covering them with mesh and stucco provides a durable structure with good insulating value.

  12. 1. EXTERIOR, OBLIQUE VIEW OF NORTH FRONT FACADES OF C.F. ...

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

    1. EXTERIOR, OBLIQUE VIEW OF NORTH FRONT FACADES OF C.F. WHEELER GROCERY, GARTON BAKERY AND CONFECTIONERY AND NIELSEN, GEHRKE AND HANSEN CLOTHING STORE (RIGHT TO LEFT) - East Locust Street Commercial District, 521-529 East Locust Street, Des Moines, Polk County, IA

  13. A TRANSMISSION PROBLEM FOR FLUID-STRUCTURE INTERACTION IN THE EXTERIOR OF A THIN DOMAIN

    E-print Network

    not only the fluid pressure in the exterior, but also the elasto- dynamic oscillations in the thin region in the absence of a pressure field in the exte- rior fluid region, the elastic domain may support so of solutions is usually demonstrated by casting the problem into variational form, and then using standard

  14. Effects of Exterior Blinds and Heat-generating Double-glazing in an Office Building

    Microsoft Academic Search

    Takashi Inoue; Takaharu Kawase

    In an office building, which has various heat sources such as lighting, people, PCs and other equipment, solar shading has much importance from the viewpoint of reducing the cooling load. In Japan, however, it is rather difficult to use exterior blinds because of exposure to strong winds such as typhoons. In this study, we tried to evaluate the thermal performance

  15. 1. EXTERIOR VIEW OF BUILDING 25A (COLD CHAMBER), LOOKING NORTHEAST, ...

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

    1. EXTERIOR VIEW OF BUILDING 25A (COLD CHAMBER), LOOKING NORTHEAST, WITH WIND TUNNEL IN BACKGROUND (1991). - Wright-Patterson Air Force Base, Area B, Buildings 25 & 24,10-foot & 20-foot Wind Tunnel Complex, Northeast side of block bounded by K, G, Third, & Fifth Streets, Dayton, Montgomery County, OH

  16. 2. EXTERIOR VIEW OF BUILDING 25B (TEST CHAMBER BUILDING) AND ...

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

    2. EXTERIOR VIEW OF BUILDING 25B (TEST CHAMBER BUILDING) AND WIND TUNNEL, LOOKING NORTHWEST (1991). - Wright-Patterson Air Force Base, Area B, Buildings 25 & 24,10-foot & 20-foot Wind Tunnel Complex, Northeast side of block bounded by K, G, Third, & Fifth Streets, Dayton, Montgomery County, OH

  17. The Galactic nucleus: A unique region in the Galactic ecosystem

    NASA Technical Reports Server (NTRS)

    Genzel, Reinhard; Poglitsch, Albrecht

    1995-01-01

    The nucleus is a unique region in the Galactic ecosystem. It is also superb laboratory of modern astrophysics where astronomers can study, at unprecedented spatial resolution and across the entire electromagnetic spectrum, physical processes that may also happen at the cores of other galaxies. Infrared observations from the Kuiper Airborne Observatory have made important contributions to unraveling the mysteries of the Galactic nucleus and this review highlights some of these measurements, as well as recent results regarding the central parsec.

  18. Seal ring installation tool

    NASA Technical Reports Server (NTRS)

    Haselmaier, L. Haynes (Inventor)

    2004-01-01

    A seal ring tool that allows an installer to position a primary seal ring between hub ends of pipe flanges that are being assembled together. The tool includes a pivoting handle member and extension arms attached to the pivoting handle member. The ends of the arms have side indentation type longitudinal grooves angled toward one another for holding the primary seal ring in place between the hubs of respective pipes that are to be attached together. The arms of the tool can also have flat sides that can be used to abut against an optional second larger seal that is supported within a groove in one of the hub ends so that the second hub end can then be moved against the other side of the primary seal ring. Once the seal ring is positioned between the pipe hubs, the pipe hubs can be moved about the seal ring due to the flat sides of the arms of the tool. The tool eliminates the chances of damaging and contaminating seal rings being installed within pipe hubs that are being attached to one another.

  19. Hot piston ring tests

    NASA Technical Reports Server (NTRS)

    Allen, David J.; Tomazic, William A.

    1987-01-01

    As part of the DOE/NASA Automotive Stirling Engine Project, tests were made at NASA Lewis Research Center to determine whether appendix gap losses could be reduced and Stirling engine performance increased by installing an additional piston ring near the top of each piston dome. An MTI-designed upgraded Mod I Automotive Stirling Engine was used. Unlike the conventional rings at the bottom of the piston, these hot rings operated in a high temperature environment (700 C). They were made of a high temperature alloy (Stellite 6B) and a high temperature solid lubricant coating (NASA Lewis-developed PS-200) was applied to the cylinder walls. Engine tests were run at 5, 10, and 15 MPa operating pressure over a range of operating speeds. Tests were run both with hot rings and without to provide a baseline for comparison. Minimum data to assess the potential of both the hot rings and high temperature low friction coating was obtained. Results indicated a slight increase in power and efficiency, an increase over and above the friction loss introduced by the hot rings. Seal leakage measurements showed a significant reduction. Wear on both rings and coating was low.

  20. Rotation Curve Anomaly and Galactic Warp in M 51

    NASA Astrophysics Data System (ADS)

    Oikawa, Shouta; Sofue, Yoshiaki

    2014-07-01

    We revisit the anomaly of rotation curve in the nearly face-on galaxy M 51 that shows an apparently faster decrease of rotation velocity than the Keplerian law in the outer disk, further showing apparent counter rotation in the outermost H I disk. We interpreted this anomaly as being due to warping of the galactic disk, and determined the warping structure of M 51's disk using the tilted-ring method, while assuming that the intrinsic rotation curve is normal. It has been shown that the disk is nearly flat in the inner disk at a constant inclination angle, but the disk suddenly bends at radius 7.5 kpc by about 27°. The inclination angle, then, decreases monotonically outward, reaching a perfect face-on ring at 18 kpc, beyond which the disk is warped in the opposite sense to the inner disk, resulting in apparent counter rotation.

  1. Theodolite Ring Lights

    NASA Technical Reports Server (NTRS)

    Clark, David

    2006-01-01

    Theodolite ring lights have been invented to ease a difficulty encountered in the well-established optical-metrology practice of using highly reflective spherical tooling balls as position references. A theodolite ring light produces a more easily visible reflection and eliminates the need for an autocollimating device. A theodolite ring light is a very bright light source that is well centered on the optical axis of the instrument. It can be fabricated, easily and inexpensively, for use on a theodolite or telescope of any diameter.

  2. The Ring of Fire

    NSDL National Science Digital Library

    2007-12-12

    In this lesson plan students will learn about the theory of plate tectonics and the geological history of Earth. They will investigate the region known as the Ring of Fire, where 75 percent of the active and dormant volcanoes of Earth are located. Students will review the theory of plate tectonics; use the Internet to research the Ring of Fire and answer questions about this region; view an animation of the tectonic history of Earth and draw maps predicting what the Ring of Fire region will look like in one hundred million years; and write paragraphs explaining what they have drawn.

  3. Dynamics of planetary rings

    NASA Astrophysics Data System (ADS)

    Araki, S.

    1991-02-01

    The modeling of the dynamics of particle collisions within planetary rings is discussed. Particles in the rings collide with one another because they have small random motions in addition to their orbital velocity. The orbital speed is roughly 10 km/s, while the random motions have an average speed of about a tenth of a millimeter per second. As a result, the particle collisions are very gentle. Numerical analysis and simulation of the ring dynamics, performed with the aid of a supercomputer, is outlined.

  4. Galactic Twins of the Nebula Around SN 1987A: Hints that LBVs may be supernova progenitors

    E-print Network

    Nathan Smith

    2007-05-21

    I discuss outstanding questions about the formation of the ring nebula around SN1987A and some implications of similar ring nebulae around Galactic B supergiants. There are notable obstacles for the formation of SN1987A's bipolar nebula through interacting winds in a transition from a red supergiant to a blue supergiant. Instead, several clues hint that the nebula may have been ejected in an LBV-like event. In addition to the previously known example of Sher25, there are two newly-discovered Galactic analogs of SN1987A's ringed nebula. Of these three Galactic analogs around blue supergiants, two (Sher25 and SBW1) have chemical abundances indicating that they have not been through a red supergiant phase, and the remaining ringed bipolar nebula surrounds a luminous blue variable (HD168625). Although SK-69 202's initial mass of 20 Msun is lower than those atributed to most LBVs, it is not far off, and the low-luminosity end of the LBV phenomenon is not well defined. Furthermore, HD168625's luminosity indicates an initial mass of only 25 Msun, that of SBW1 is consistent with 20 Msun, and there is a B[e] star in the SMC with an initial mass of 20 Msun that experienced an LBV outburst in the 1990s. These similarities may be giving us important clues about Sk-69 202's pre-SN evolution and the formation mechanism of its nebula.

  5. Can we distinguish between black holes and wormholes by their Einstein-ring systems?

    NASA Astrophysics Data System (ADS)

    Tsukamoto, Naoki; Harada, Tomohiro; Yajima, Kohji

    2012-11-01

    For the past decade, gravitational lensing in the strong gravitational field has been studied eagerly. It is well known that, for the lensing by a black hole, an infinite number of Einstein rings are formed by the light rays which wind around the black hole nearly on the photon sphere, which are called relativistic Einstein rings. This is also the case for the lensing by a wormhole. In this paper, we study the Einstein ring and relativistic Einstein rings for the Schwarzschild black hole and the Ellis wormhole, the latter of which is an example of traversable wormholes of the Morris-Thorne class. Given the configuration of the gravitational lensing and the radii of the Einstein ring and relativistic Einstein rings, we can distinguish between a black hole and a wormhole in principle. We conclude that we can detect the relativistic Einstein rings by wormholes which have the radii of the throat a?0.5pc at a Galactic center with the distance 10 Mpc and which have a?10AU in our Galaxy using the most powerful modern instruments which have the resolution of 10-2arcsecond such as a 10-meter optical-infrared telescope. The black holes which make the Einstein rings of the same size as the ones by the wormholes are galactic supermassive black holes and the relativistic Einstein rings by the black holes are too small to measure with the current technology. We may test the hypotheses of astrophysical wormholes by using the Einstein ring and relativistic Einstein rings in the future.

  6. Noncommutative ring spectra

    E-print Network

    Angeltveit, Vigleik

    2006-01-01

    Let A be an Ax ring spectrum. We give an explicit construction of topological Hochschild homology and cohomology of A using the Stasheff associahedra and another family of polyhedra called cyclohedra. Using this construction ...

  7. Evolution in a Ring

    NSDL National Science Digital Library

    John Ausema (Gonzaga College High School; )

    2005-07-01

    This lesson engages students in critical thinking about ring species and how the process of speciation occurs. Students work on distribution maps, write news stories, consider What if? scenariosand more!

  8. Ringed-Carbon Compounds

    NSDL National Science Digital Library

    WGBH Educational Foundation

    2007-02-12

    In this interactive activity adapted from NOVA, learn about alkaloids and steroids, both examples of compounds with carbon rings. Short videos with interviews,animations, and photographs are featured.

  9. Differential rings and ore extensions: Brown-McCoy rings

    Microsoft Academic Search

    Miguel Ferrero

    1986-01-01

    We consider here a ringK, a derivationD ofK and the differential polynomial ringR=K[X;D]. The ringK is said to be a Brown-McCoy ring if the prime radical coincides with the Brown-McCoy radical in every homomorphic image ofK. AD-Brown-McCoy ring is defined in a similar way. We prove the following conditions are equivalent: (i)K is aD-Brown-McCoy ring; (ii)R is a Brown-McCoy ring

  10. Large-scale distribution of molecular gas in the first Galactic quadrant

    SciTech Connect

    Clemens, D.P.; Sanders, D.B.; Scoville, N.Z.

    1988-04-01

    The emission parameters for the molecular component of the interstellar medium are determined throughout the first Galactic quadrant. Face-on maps of the peak midplane molecular density, scale height, and offset from b = 0 deg with roughly 300 pc resolution are presented. These maps are compared with the distribution of cataloged H II regions to test whether both species trace the same Galactic locations. The properties of the spiral (or ringlike) arms are deduced from the derived images and pitch-angle upper limits are estimated. The H II regions are strongly correlated with the dense molecular rings. 33 references.

  11. The large-scale distribution of molecular gas in the first Galactic quadrant

    NASA Technical Reports Server (NTRS)

    Clemens, Dan P.; Sanders, David B.; Scoville, Nicholas Z.

    1988-01-01

    The emission parameters for the molecular component of the interstellar medium are determined throughout the first Galactic quadrant. Face-on maps of the peak midplane molecular density, scale height, and offset from b = 0 deg with roughly 300 pc resolution are presented. These maps are compared with the distribution of cataloged H II regions to test whether both species trace the same Galactic locations. The properties of the spiral (or ringlike) arms are deduced from the derived images and pitch-angle upper limits are estimated. The H II regions are strongly correlated with the dense molecular rings.

  12. Saturn's dynamic D ring

    USGS Publications Warehouse

    Hedman, M.M.; Burns, J.A.; Showalter, M.R.; Porco, C.C.; Nicholson, P.D.; Bosh, A.S.; Tiscareno, M.S.; Brown, R.H.; Buratti, B.J.; Baines, K.H.; Clark, R.

    2007-01-01

    The Cassini spacecraft has provided the first clear images of the D ring since the Voyager missions. These observations show that the structure of the D ring has undergone significant changes over the last 25 years. The brightest of the three ringlets seen in the Voyager images (named D72), has transformed from a narrow, <40-km wide ringlet to a much broader and more diffuse 250-km wide feature. In addition, its center of light has shifted inwards by over 200 km relative to other features in the D ring. Cassini also finds that the locations of other narrow features in the D ring and the structure of the diffuse material in the D ring differ from those measured by Voyager. Furthermore, Cassini has detected additional ringlets and structures in the D ring that were not observed by Voyager. These include a sheet of material just interior to the inner edge of the C ring that is only observable at phase angles below about 60??. New photometric and spectroscopic data from the ISS (Imaging Science Subsystem) and VIMS (Visual and Infrared Mapping Spectrometer) instruments onboard Cassini show the D ring contains a variety of different particle populations with typical particle sizes ranging from 1 to 100 microns. High-resolution images reveal fine-scale structures in the D ring that appear to be variable in time and/or longitude. Particularly interesting is a remarkably regular, periodic structure with a wavelength of ??? 30 ?? km extending between orbital radii of 73,200 and 74,000 km. A similar structure was previously observed in 1995 during the occultation of the star GSC5249-01240, at which time it had a wavelength of ??? 60 ?? km. We interpret this structure as a periodic vertical corrugation in the D ring produced by differential nodal regression of an initially inclined ring. We speculate that this structure may have formed in response to an impact with a comet or meteoroid in early 1984. ?? 2006 Elsevier Inc. All rights reserved.

  13. The rings of Uranus

    NASA Technical Reports Server (NTRS)

    Elliot, J. L.; Dunham, E.; Mink, D.

    1977-01-01

    A description is given of the observation of five brief occultations of the star SAO 158687 which occurred both before and after its occultation by Uranus on March 10, 1977. The events were observed with a three-channel occultation photometer, attached to a 91-cm telescope. The observations indicate that at least five rings encircle the planet Uranus. Possible reasons for the narrowness of the Uranus rings are discussed.

  14. Soliton fiber ring laser

    Microsoft Academic Search

    C.-J. Chen; P. K. A. Wai; C. R. Menyuk

    1992-01-01

    A fiber ring laser that can produce nearly transform-limited soliton pulses is simulated. This laser has an erbium-doped optical-fiber amplifier and allows wavelength tuning through the interplay of fiber chromatic dispersion and the round-trip delay time of the laser. We show that a saturable absorber and a frequency limiter are required for the ring laser to self-start, i.e., to mode

  15. Galactic planetary science

    PubMed Central

    Tinetti, Giovanna

    2014-01-01

    Planetary science beyond the boundaries of our Solar System is today in its infancy. Until a couple of decades ago, the detailed investigation of the planetary properties was restricted to objects orbiting inside the Kuiper Belt. Today, we cannot ignore that the number of known planets has increased by two orders of magnitude nor that these planets resemble anything but the objects present in our own Solar System. Whether this fact is the result of a selection bias induced by the kind of techniques used to discover new planets—mainly radial velocity and transit—or simply the proof that the Solar System is a rarity in the Milky Way, we do not know yet. What is clear, though, is that the Solar System has failed to be the paradigm not only in our Galaxy but even ‘just’ in the solar neighbourhood. This finding, although unsettling, forces us to reconsider our knowledge of planets under a different light and perhaps question a few of the theoretical pillars on which we base our current ‘understanding’. The next decade will be critical to advance in what we should perhaps call Galactic planetary science. In this paper, I review highlights and pitfalls of our current knowledge of this topic and elaborate on how this knowledge might arguably evolve in the next decade. More critically, I identify what should be the mandatory scientific and technical steps to be taken in this fascinating journey of remote exploration of planets in our Galaxy. PMID:24664916

  16. Nanoscopic tubulin rings*

    NASA Astrophysics Data System (ADS)

    Boukari, Hacene; Sackett, Dan; Schuck, Peter; Krueger, Susan; Nossal, Ralph

    2006-03-01

    We describe results of analysis of fluorescence correlation spectroscopy, small-angle neutron scattering, and sedimentation measurements of nanoscopic polymer rings formed following interactions of tubulin (100 kDa) and a small peptide, cryptophycin (340 Da). Tubulin is a ubiquitous dimeric protein found in eukaryotic cells, and is the building block of microtubules, which are dynamical biopolymers involved in many critical cell functions. The peptide, which is a marine natural product, inhibits the formation of microtubules and, instead, induces the formation of the rings. Under the studied conditions these rings appear rigid, have circular geometry (˜ 25 nm dia.), are monodisperse in size (8 tubulin dimers/ring), and are stable even with tubulin concentration as low as 1 nM. Remarkably, no intermediate oligomers (partial rings or others) are observed. Further, structural and hydrodynamic modeling confirms the number (8) of tubulin dimers per ring and shows that the tubulin monomers are not spherical, consistent with their known crystallographic structure. *H. Boukari, R. Nossal, D. Sackett, and P. Schuck, PRL 93, 98106 (2004).

  17. Nardo Ring, Italy

    NASA Technical Reports Server (NTRS)

    2008-01-01

    The Nardo Ring is a striking visual feature from space, and astronauts have photographed it several times. The Ring is a race car test track; it is 12.5 kilometers long and steeply banked to reduce the amount of active steering needed by drivers. The Nardo Ring lies in a remote area on the heel of Italy's 'boot,' 50 kilometers east of the naval port of Taranto. The Ring encompasses a number of active (green) and fallow (brown to dark brown) agricultural fields. In this zone of intensive agriculture, farmers gain access to their fields through the Ring via a series of underpasses. Winding features within the southern section of the Ring appear to be smaller, unused race tracks.

    The image covers an area of 18.8 x 16.4 km, was acquired on August 17. 2007, and is located at 49.3 degrees north latitude, 17.8 degrees east longitude.

    The U.S. science team is located at NASA's Jet Propulsion Laboratory, Pasadena, Calif. The Terra mission is part of NASA's Science Mission Directorate.

  18. HIV-1 Rev Depolymerizes Microtubules to Form Stable Bilayered Rings

    PubMed Central

    Watts, Norman R.; Sackett, Dan L.; Ward, Rita D.; Miller, Mill W.; Wingfield, Paul T.; Stahl, Stephen S.; Steven, Alasdair C.

    2000-01-01

    We describe a novel interaction between HIV-1 Rev and microtubules (MTs) that results in the formation of bilayered rings that are 44–49 nm in external diameter, 3.4–4.2 MD (megadaltons) in mass, and have 28-, 30-, or 32-fold symmetry. Ring formation is not sensitive to taxol, colchicine, or microtubule-associated proteins, but requires Mg2+ and is inhibited by maytansine. The interaction involves the NH2-terminal domain of Rev and the face of tubulin exposed on the exterior of the MTs. The NH2-terminal half of Rev has unexpected sequence similarity to the tubulin-binding portion of the catalytic/motor domains of the microtubule-destabilizing Kin I kinesins. We propose a model wherein binding of Rev dimers to MTs at their ends causes segments of two neighboring protofilaments to peel off and close into rings, circumferentially containing 14, 15, or 16 tubulin heterodimers, with Rev bound on the inside. Rev has a strong inhibitory effect on aster formation in Xenopus egg extracts, demonstrating that it can interact with tubulin in the presence of normal levels of cellular constituents. These results suggest that Rev may interact with MTs to induce their destabilization, a proposition consistent with the previously described disruption of MTs after HIV-1 infection. PMID:10908577

  19. A Disturbed Galactic Duo

    NASA Astrophysics Data System (ADS)

    2011-04-01

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

  20. The Galactic Plane Infrared Polarization Survey (GPIPS): The Full Poster

    NASA Astrophysics Data System (ADS)

    Clemens, Dan P.; Cashman, L. R.; Hoq, S.; Montgomery, J.; Pavel, M. D.

    2013-01-01

    GPIPS will be completed in 2013, and the first data release (DR1) took place in August 2012 (see poster by L. Cashman). All of the 3,237 independent field observations, designed for the 10x10 arcmin Mimir instrument field of view, have been obtained, though a small number are being re-observed to meet our 2 arcsec seeing criterion. GPIPS data products include catalogs of stellar polarizations (POLCATs), catalogs of stellar photometry in the H-band (PHOTCATs), and deep co-added images for each field. The images for the entire 76 square degree region of the northern Galactic midplane surveyed have been mosaicked to create a large-format poster, which can be found elsewhere in the room. On the poster, data from the POLCATs are overlaid as polarization vectors, or circled stars for those exhibiting significant upper limits. Comparisons with other key data sets for correlative studies, such as the Galactic Ring Survey (Jackson et al. 2006), 2MASS (Skrutskie et al. 2006), WISE (Wright et al. 2010), the Bolocam Galactic Plane Survey (BGPS; Aguirre et al. 2011), GLIMPSE (Benjamin et al. 2003), and MIPSGAL (Mizuno et al. 2008) are also shown. Access to released GPIPS data is currently through our web server (gpips0.bu.edu), with planned upgrades to VO compliance and mirroring from other sites. This work is partially supported by NSF/MPS grants AST 06-07500 and AST 09-07790.

  1. The Galactic Magnetic Field as Viewed from the VLA

    NASA Astrophysics Data System (ADS)

    van Eck, Cameron; Brown, Jo-Anne

    2009-05-01

    Interstellar magnetic fields play critical roles in many astrophysical processes. Yet despite their importance, our knowledge about magnetic fields in our Galaxy remains limited. For the field within the Milky Way much of what we do know comes from radio astronomy, through observations of polarization and Faraday rotation measures (RMs) of extragalactic sources and pulsars. A high angular density of RM measurements in several critical areas of the Galaxy is needed to clarify the Galactic magnetic field structure. Understanding the overall structure of the magnetic field will subsequently help us determine the origin and evolution of the field. In an effort to determine the overall structure of the field, Sun et al. (2008) produced 3 models of the Galactic magnetic field based on RM measurements available at the time. These models made distinct predictions for RMs in a region of the inner Galaxy at low Galactic latitude. Using observations made with the Very Large Array (VLA), we have determined RMs for sources in this critical region. In this talk we will present the results of our study and show how the RMs strongly support the ASS+RING model.

  2. Saturn's Other Ring Current

    NASA Astrophysics Data System (ADS)

    Crary, F. J.

    2014-04-01

    Saturn's main rings orbit the planet within an atmosphere and ionosphere of water, oxygen and hydrogen, produced by meteoritic impacts on and ultraviolet photodesorbtion of the ring particles [Johnson et al., 2006; Luhmann et al., 2006; Tseng et al., 2010]. The neutral atmosphere itself has only been tentatively detected through ultraviolet fluorescents of OH [Hall et al., 1996] while the ionosphere was observed in situ by the Cassini spacecraft shortly after orbital insertion [Coates et al.,2005; Tokar et al. 2005, Waite et al. 2005]. Although the plasma flow velocity of this ionosphere is not well-constrained, but the close association with the rings suggests that its speed would be couppled to the keplarian velocity of the rings themselves. As a result, the motion of the plasma through Saturn's magnetic field would produce an induced voltage, oriented away from the planet outside synchronous orbit and towards the planet inside synchronous orbit. Such a potential could result in currents flowing across the ring plane and closeing along magnetic field lines and through Saturn's ionosphere at latitudes between 36o and 48o. Cassini observations of whistler-mode plasma wave emissions [Xin et al.,2006] centered on synchronous orbit (1.76 Rs, mapping to 41o latitude) have been interpreted as a product of field-aligned electron beams associated with such a current. This presentation will investigate the magnitude of these currents and the resulting Joule heating of the ionosphere. An important constraint is that no auroral ultraviolet emissions have been observed at the relevant latitudes. In contrast, Joule heating could affect infrared emissions from H3+. Variations in H3+ emission associated with Saturn's rings have been reported by O'Donoghue et al., 2013, and interpreted as a result of ring "rain", i.e. precipitating water group species from the rings which alter ionosphereic chemistry and H3+ densities. As noted by O'Donoghue et al., this interpretation may be complicated by Joule heating by the ring-related currents.

  3. High-Q exterior whispering gallery modes in a metal-coated microresonator

    E-print Network

    Yun-Feng Xiao; Chang-Ling Zou; Bei-Bei Li; Yan Li; Chun-Hua Dong; Zheng-Fu Han; Qihuang Gong

    2010-11-01

    We propose a kind of plasmonic whispering gallery modes highly localized on the exterior surface of a metal-coated microresonator. This exterior (EX) surface mode possesses high quality factors at room temperature, and can be efficiently excited by a tapered fiber. The EX mode can couple to an interior (IN) mode and this coupling produces a strong anti-crossing behavior, which not only allows conversion of IN to EX modes, but also forms a long-lived anti-symmetric mode. As a potential application, the EX mode could be used for a biosensor with a sensitivity high up to 500 nm per refraction index unit, a large figure of merit, and a wide detection range.

  4. Piston Ring Pressure Distribution

    NASA Technical Reports Server (NTRS)

    Kuhn, M.

    1943-01-01

    The discovery and introduction of the internal combustion engine has resulted in a very rapid development in machines utilizing the action of a piston. Design has been limited by the internal components of the engine, which has been subjected to ever increasing thermal and mechanical stresses, Of these internal engine components, the piston and piston rings are of particular importance and the momentary position of engine development is not seldom dependent upon the development of both of the components, The piston ring is a well-known component and has been used in its present shape in the steam engine of the last century, Corresponding to its importance, the piston ring has been a rich field for creative activity and it is noteworthy that in spite of this the ring has maintained its shape through the many years. From the many and complicated designs which have been suggested as a packing between piston and cylinder wall hardly one suggestion has remained which does not resemble the original design of cast iron rectangular ring.

  5. Space flight experiment: Advanced solar cells and protective materials on the ISS exterior

    Microsoft Academic Search

    Theodore D. Sahlstrom; Paul E. Hausgen; David M. Wilt; Alexander D. Howard; Michael D. Anderson Jr; Neil A. Snyder

    2010-01-01

    A space flight opportunity was seized to fly emerging solar cell, coating, and coverglass technologies in a Low Earth Orbit (LEO) environment while attached to the exterior of the International Space Station (ISS). Included in the flight manifest were nano-crystalline optimized amorphous silicon (a-Si) thin-film, Indium Phosphide (InP), and Inverted Metamorphic (IMM) Photovoltaic (PV) technologies. An array of experimental coatings

  6. Fast vs. slow-reacting non-modified tannin extracts for exterior particleboard adhesives

    Microsoft Academic Search

    A. Pizzi; A. Stephanou

    1994-01-01

    Non-fortified, non-modified tannin extracts, rather than chemically-modified tannin adhesives intermediates, can be used as\\u000a effectively to produce excellent exterior grade particleoboard at fast pressing times of industrial singnificance, with considerable\\u000a advantages in both handling and cost. This can be achieved by simple pH-controlled reactivity adjustments of the tannin extract\\u000a in the glue mix. This new concept is shown to be

  7. Classical geometries defined by exterior differential systems on higher frame bundles

    NASA Technical Reports Server (NTRS)

    Estabrook, Frank B.; Wahlquist, Hugo D.

    1989-01-01

    Exterior differential ideals are discussed, and sets of invariant generators presented, for Reimannian, conformal and projective geometries, and for specializations such as Ricci-flat, self-dual and Einstein-Maxwell theories. The Cartan characteristic integers are explicitly calculated, and involutory basis forms found, for each of these (specialized to four dimensions), exposing their algebraic structure and showing how they generate well-posed sets of partial differential equations.

  8. Enhancing exterior performance of clear coatings through photostabilization of wood. Part 2: coating and weathering performance

    Microsoft Academic Search

    Bernard S. W. Dawson; Adya P. Singh; Hank W. Kroese; Michael A. Schwitzer; Suzanne Gallagher; Stephen J. Riddiough; Shuhong Wu

    2008-01-01

    Clear-coated boards have not been recommended for use in exterior conditions since irradiation with visible and UV radiation\\u000a darkens them and photodegrades the lignin in the wooden surface beneath the coating, leading to delamination and subsequent\\u000a catastrophic coating failure due to the continued action of sun, rain, and biological factors. Many approaches to rectify\\u000a this problem have been explored. Chemical

  9. 1. Exterior view of Signal Transfer Building (T28A), looking southwest. ...

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

    1. Exterior view of Signal Transfer Building (T-28A), looking southwest. This structure houses controls for propellant transfer, instrumentation for testing, test data transmission receivers, data verification equipment, and centralized utilities for the Systems Integration Laboratory complex. The gantries of the Systems Integration Laboratory Building (T-28) are visible to the rear of this structure. - Air Force Plant PJKS, Systems Integration Laboratory, Signal Transfer Building, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

  10. 3. EXTERIOR/STREET LEVEL VIEW, LOOKING WEST ALONG FIRST AVENUE NORTH ...

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

    3. EXTERIOR/STREET LEVEL VIEW, LOOKING WEST ALONG FIRST AVENUE NORTH WITH (LEFT TO RIGHT) CALDWELL-MILNER, MCADORY, JOHN HAND, WOODWARD BUILDINGS AND BROWN MARX BUILDING (RIGHT). ALSO PICTURED IS THE BANK FOR SAVINGS BUILDING (TOP RIGHT) AND THE RAILROAD RESERVATION (TOP LEFT TO RIGHT). VIEW TAKEN AS CITY THAWS FROM A MARCH BLIZZARD. - Heaviest Corner on Earth (Commercial), First Avenue, North & Twentieth (20th) Street, North, Birmingham, Jefferson County, AL

  11. Glossy topcoat exterior paint formulations using water-based polyurethane\\/acrylic hybrid binders

    Microsoft Academic Search

    A. C. Aznar; O. R. Pardini; J. I. Amalvy

    2006-01-01

    The development of glossy topcoat one-pot exterior paint formulations using water-based polyurethane\\/acrylates hybrid binders as well as the assessment of its properties through different conventional tests is discussed in this work. Polyurethane (PU) anionomer having 2-ethoxymethacrylate terminal groups was prepared following a prepolymer mixing process. This prepolymer was chain extended in aqueous solution and after addition of acrylic monomers radical

  12. Exterior view of north wall of LongTerm Oxidizer Silo (T28B) ...

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

    Exterior view of north wall of Long-Term Oxidizer Silo (T-28B) and Oxidizer Conditioning Structure (T-28D) behind and to its immediate left, looking south. A nitrogen line, used to prepare the Titan II's nitrogen-tetroxide oxidizer, is in the right foreground - Air Force Plant PJKS, Systems Integration Laboratory, Long-Term Oxidizer Silo, Waterton Canyon Road & Colorado Highway 121, Lakewood, Jefferson County, CO

  13. Measurement of Exterior Foundation Insulation to Assess Durability in Energy-Saving Performance

    SciTech Connect

    Kehrer, Manfred [ORNL; Christian, Jeff [Oak Ridge National Laboratory (ORNL)

    2012-04-01

    The foundation of a house is a sometimes ignored component of the building because of its low visibility. It is increasingly evident, however, that attention to good foundation design and construction significantly benefits the homeowner and the builder by mitigating future problems. Good foundation design and construction practice involves not only insulating to save energy but also providing effective structural design as well as moisture, termite, and radon control techniques as appropriate. Energy efficiency in housing is augmented by use of exterior slab and basement insulation, but high moisture content in the insulation material has led to concerns about its durability. The activity under this task was to extract six different exterior insulation systems that were characterized at installation and have been in the ground for 9 months to 15 years. R-value and moisture content were measured and inspections conducted for evidence of termite intrusion or deterioration. Based on the results, the durability of the various systems has been documented and assessments made of which systems appear to be best practice. Heat flux and temperature measurement data had been archived for some of the exterior insulation tests, thereby providing a unique opportunity to assess energy-saving performance and durability over the long term. The results show that the durability of foundation insulation systems depends on insulation type as well as on foundation type and local boundary conditions, the latter of which may have a marked influence on the durability of energy-saving performance.

  14. Behaviour of fibre-reinforced high-performance concrete in exterior beam-column joint

    NASA Astrophysics Data System (ADS)

    Muthupriya, P.; Boobalan, S. C.; Vishnuram, B. G.

    2014-09-01

    This paper presents the effect of reinforced high performance concrete (HPC) in exterior beam-column joint with and without fibre under monotonic loading. In this experimental investigation, cross-diagonal bars have been provided at the joint for reducing the congestion of reinforcement in joints, and also M75 grade of concrete with optimum mix proportion of 10 % silica fume and 0.3 % glass fibre was used. Four exterior beam-column joint sub-assemblages were tested. The specimens were divided into two types based on the reinforcement detailing. Type A comprises two joint sub-assemblages with joint detailing as per construction code of practice in India (IS 456-2000), and Type B comprises two joint sub-assemblages with joint detailing as per ductile detailing code of practice in India (IS 13920-1993). In each group there was one specimen of control mix and the remaining one specimen of fibre-reinforced mix. All the test specimens were designed to satisfy the strong column-weak beam concept. The performances of specimens were compared with the control mix and the fibre-reinforced mix. The results show that exterior beam-column joint specimens with silica fume and glass fibre in the HPC mix showed better performance.

  15. Where Galactic Snakes Live

    NASA Technical Reports Server (NTRS)

    2006-01-01

    This infrared image from NASA's Spitzer Space Telescope shows what astronomers are referring to as a 'snake' (upper left) and its surrounding stormy environment. The sinuous object is actually the core of a thick, sooty cloud large enough to swallow dozens of solar systems. In fact, astronomers say the 'snake's belly' may be harboring beastly stars in the process of forming.

    The galactic creepy crawler to the right of the snake is another thick cloud core, in which additional burgeoning massive stars might be lurking. The colorful regions below the two cloud cores are less dense cloud material, in which dust has been heated by starlight and glows with infrared light. Yellow and orange dots throughout the image are monstrous developing stars; the red star on the 'belly' of the snake is 20 to 50 times as massive as our sun. The blue dots are foreground stars.

    The red ball at the bottom left is a 'supernova remnant,' the remains of massive star that died in a fiery blast. Astronomers speculate that radiation and winds from the star before it died, in addition to a shock wave created when it exploded, might have played a role in creating the snake.

    Spitzer was able to spot the two black cloud cores using its heat-seeking infrared vision. The objects are hiding in the dusty plane of our Milky Way galaxy, invisible to optical telescopes. Because their heat, or infrared light, can sneak through the dust, they first showed up in infrared images from past missions. The cloud cores are so thick with dust that if you were to somehow transport yourself into the middle of them, you would see nothing but black, not even a star in the sky. Now, that's spooky!

    Spitzer's new view of the region provides the best look yet at the massive embryonic stars hiding inside the snake. Astronomers say these observations will ultimately help them better understand how massive stars form. By studying the clustering and range of masses of the stellar embryos, they hope to determine if the stars were born in the same way that our low-mass sun was formed - out of a collapsing cloud of gas and dust - or by another mechanism in which the environment plays a larger role.

    The snake is located about 11,000 light-years away in the constellation Sagittarius.

    This false-color image is a composite of infrared data taken by Spitzer's infrared array camera and multiband imaging photometer. Blue represents 3.6-micron light; green shows light of 8 microns; and red is 24-micron light.

  16. Electronic detection of molecules on the exterior and molecular transport through the interior of single walled carbon nanotubes

    E-print Network

    Lee, Chang Young

    2010-01-01

    Single walled carbon nanotubes (SWNT) are unique materials with high surface to volume ratio and all atoms residing on the surface. Due to their tubular shape both exterior and interior of the SWNT are available for ...

  17. Unidirectional ring lasers

    DOEpatents

    Hohimer, John P. (Albuquerque, NM); Craft, David C. (Albuquerque, NM)

    1994-01-01

    Unidirectional ring lasers formed by integrating nonreciprocal optical elements into the resonant ring cavity. These optical elements either attenuate light traveling in a nonpreferred direction or amplify light traveling in a preferred direction. In one preferred embodiment the resonant cavity takes the form of a circle with an S-shaped crossover waveguide connected to two points on the interior of the cavity such that light traveling in a nonpreferred direction is diverted from the cavity into the crossover waveguide and reinjected out of the other end of the crossover waveguide into the cavity as light traveling in the preferred direction.

  18. BIOCHEMISTRY: Five Golden Rings

    NSDL National Science Digital Library

    David W. Christianson (University of Pennsylvania; Roy and Diana Vagelos Laboratories, Department of Chemistry)

    2006-03-10

    Access to the article is free, however registration and sign-in are required. Despite its worldwide use as a food preservative for more than four decades, the antibiotic nisin has not induced widespread biological resistance (1-4), making its biosynthesis particularly intriguing. Li et al. report that the antibiotic nisin bears five rings of different sizes in its structure. The enzyme that catalyzes the five distinct cyclization reactions is flexible, yet stringent, enough to form each ring in the correct order and conformation.

  19. Unidirectional ring lasers

    DOEpatents

    Hohimer, J.P.; Craft, D.C.

    1994-09-20

    Unidirectional ring lasers formed by integrating nonreciprocal optical elements into the resonant ring cavity is disclosed. These optical elements either attenuate light traveling in a nonpreferred direction or amplify light traveling in a preferred direction. In one preferred embodiment the resonant cavity takes the form of a circle with an S-shaped crossover waveguide connected to two points on the interior of the cavity such that light traveling in a nonpreferred direction is diverted from the cavity into the crossover waveguide and reinjected out of the other end of the crossover waveguide into the cavity as light traveling in the preferred direction. 21 figs.

  20. Ring laser gyroscope anode

    SciTech Connect

    Ljung, B.H.

    1981-03-17

    An anode for a ring laser gyroscope which provides improved current stability in the glow discharge path is disclosed. The anode of this invention permits operation at lower currents thereby allowing a reduction of heat dissipation in the ring laser gyroscope. The anode of one embodiment of this invention is characterized by a thumbtack appearance with a spherical end where the normal sharp end of the thumbtack would be located. The stem of the anode extends from the outside of the gyroscope structure to the interior of the structure such that the spherical end is substantially adjacent to the laser beam.

  1. How to Simulate Galactic Outflows?

    NASA Astrophysics Data System (ADS)

    Barai, Paramita

    2015-02-01

    A challenge in cosmological simulations is to formulate a physical model of star-formation (SF) and supernovae (SN) feedback which produces galactic outflows like that widely observed. In several models an outflow velocity (v out) and mass loading factor (?) are input to the sub-resolution recipe. We present results from our MUPPI model, which uses local properties of gas, and is able to develop galactic outflows whose properties correlate with global galaxy properties, consistent with observations; demonstrating a significant improvement in such work.

  2. Observing the next galactic supernova

    SciTech Connect

    Adams, Scott M.; Kochanek, C. S.; Beacom, John F.; Stanek, K. Z. [Department of Astronomy, The Ohio State University, 140 West 18th Avenue, Columbus, OH 43210 (United States); Vagins, Mark R. [Kavli Institute for the Physics and Mathematics of the Universe (WPI), Todai Institutes for Advanced Study, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583 (Japan)

    2013-12-01

    No supernova (SN) in the Milky Way has been observed since the invention of the optical telescope, instruments for other wavelengths, neutrino detectors, or gravitational wave observatories. It would be a tragedy to miss the opportunity to fully characterize the next one. To aid preparations for its observations, we model the distance, extinction, and magnitude probability distributions of a successful Galactic core-collapse supernova (ccSN), its shock breakout radiation, and its massive star progenitor. We find, at very high probability (? 100%), that the next Galactic SN will easily be detectable in the near-IR and that near-IR photometry of the progenitor star very likely (? 92%) already exists in the Two Micron All Sky Survey. Most ccSNe (98%) will be easily observed in the optical, but a significant fraction (43%) will lack observations of the progenitor due to a combination of survey sensitivity and confusion. If neutrino detection experiments can quickly disseminate a likely position (?3°), we show that a modestly priced IR camera system can probably detect the shock breakout radiation pulse even in daytime (64% for the cheapest design). Neutrino experiments should seriously consider adding such systems, both for their scientific return and as an added and internal layer of protection against false triggers. We find that shock breakouts from failed ccSNe of red supergiants may be more observable than those of successful SNe due to their lower radiation temperatures. We review the process by which neutrinos from a Galactic ccSN would be detected and announced. We provide new information on the EGADS system and its potential for providing instant neutrino alerts. We also discuss the distance, extinction, and magnitude probability distributions for the next Galactic Type Ia supernova (SN Ia). Based on our modeled observability, we find a Galactic ccSN rate of 3.2{sub ?2.6}{sup +7.3} per century and a Galactic SN Ia rate of 1.4{sub ?0.8}{sup +1.4} per century for a total Galactic SN rate of 4.6{sub ?2.7}{sup +7.4} per century is needed to account for the SNe observed over the last millennium, which implies a Galactic star formation rate of 3.6{sub ?3.0}{sup +8.3} M {sub ?} yr{sup –1}.

  3. The Galactic bulge and halo

    NASA Technical Reports Server (NTRS)

    Morrison, Heather L.; Harding, Paul

    1993-01-01

    The relationship between the Galactic halo and bulge is discussed, with reference to early results from a survey for K giants in a field 2 kpc from the Galactic center and Zinn's (1992) data on globular-cluster kinematics. The data are currently too meager to decide whether the inner halo shades gradually into the bulge, although there are some interesting kinematical similarities between bulge stars and Zinn's Old Halo clusters in the inner Galaxy. Useful observations that would help decide this matter are also discussed.

  4. SIZES OF GALACTIC GLOBULAR CLUSTERS

    SciTech Connect

    Van den Bergh, Sidney, E-mail: sidney.vandenbergh@nrc-cnrc.gc.ca [Dominion Astrophysical Observatory, Herzberg Institute of Astrophysics, National Research Council of Canada, 5071 West Saanich Road, Victoria, BC, V9E 2E7 (Canada)

    2012-02-20

    A study is made of deviations from the mean power-law relationship between the Galactocentric distances and the half-light radii of Galactic globular clusters. Surprisingly, deviations from the mean R{sub h} versus R{sub gc} relationship do not appear to correlate with cluster luminosity, cluster metallicity, or horizontal-branch morphology. Differences in orbit shape are found to contribute to the scatter in the R{sub h} versus R{sub gc} relationship of Galactic globular clusters.

  5. Galactic gamma-ray observations and galactic structure

    NASA Technical Reports Server (NTRS)

    Stecker, F. W.

    1975-01-01

    Recent observations of gamma-rays originating in the galactic disk together with radio observations, support an emerging picture of the overall structure of our galaxy with higher interstellar gas densities and star formation rates in a region which corresponds to that of the inner arms. The emerging picture is one where molecular clouds make up the dominant constituent of the interstellar gas in the inner galaxy and play a key role in accounting for the gamma-rays and phenomena associated with the production of young stars and other population 1 objects. In this picture, cosmic rays are associated with supernovae and are primarily of galactic origin. These newly observed phenomena can be understood as consequences of the density wave theories of spiral structure. Based on these new developments, the suggestion is made that a new galactic population class, Population O, be added to the standard Populations 1 and 2 in order to recognize important differences in dynamics and distribution between diffuse galactic H1 and interstellar molecular clouds.

  6. Pulsar-based Galactic Magnetic Map: A Large-Scale Clockwise Magnetic Field with an Anticlockwise Annulus

    NASA Astrophysics Data System (ADS)

    Vallée, Jacques P.

    2005-01-01

    The rotation measure RM and location L of over 350 pulsars in the Milky Way are used to constrain the structure of the large-scale magnetic field in the Milky Way disk. Various magnetic field directions in various concentric circles are employed in the mapping to fit the RM and L values, allowing the testing of various models. This approach can build up signal-to-noise ratios by averaging across large rings (of size 1 kpc); at worst, this approach may miss a (double) field reversal occurring within a ring. My current work here begins with the assumption of concentric rings. In the best pulsar-based fit, an overall clockwise-going magnetic field (as seen from the north Galactic pole) extends radially at least from 1 to 12 kpc from the Galactic center, except for a 2 kpc wide anticlockwise magnetic field located in an annulus between 4 and 6 kpc from the Galactic center. The best fit has a very special feature in the form of a string of H II regions located in the anticlockwise annulus. For the mean pulsar RM as averaged over radial rings, the system of a clockwise-going Galactic magnetic field with only one anticlockwise-going field in an annulus produces the lowest reduced ?2. All other fits with a different number of field-reversed annuli have a 4 times larger reduced ?2 or worse. Thus a completely clockwise fit (no reversed ring) has a 5 times larger reduced ?2. Fits do not support more than one magnetically reversed annulus in the Galaxy, coming up with an 8 times larger reduced ?2 for two opposite rings, 4 times larger for four opposite rings, 4 times larger for six opposite rings, and 9 times larger for 12 alternating zones. Splitting the pulsars above from those below the Galactic plane, the best fit with a single reversed ring holds true separately for pulsars above the plane and for pulsars below the plane. The origin of the anticlockwise annulus could be due to a number of factors (internal or external) or could be primordial (regular or chaotic).

  7. The gravitational interaction between inclined, elliptical rings. [Uranus rings

    NASA Technical Reports Server (NTRS)

    Yoder, C. F.

    1982-01-01

    An expression for the potential for two elliptical, inclined rings is derived from a model in which the gravitational torque between two wide rings or within a ring of finite width can prevent differential precession caused by planetary oblateness. The model was proposed to explain the observed eccentricity and width variations of the Uranian epsilon ring. The stationary solutions and stability of this system are examined.

  8. The largest left quotient ring of a ring

    Microsoft Academic Search

    V. V. Bavula

    2011-01-01

    The left quotient ring (i.e. the left classical ring of fractions) $Q_{cl}(R)$ of a ring $R$ does not always exist and still, in general, there is no good understanding of the reason why this happens. In this paper, it is proved existence of the largest left quotient ring $Q_l(R)$, i.e. $Q_l(R) = S_0(R)^{-1}R$ where $S_0(R)$ is the largest left regular

  9. Imprint of Galactic dynamics on Earth's climate

    Microsoft Academic Search

    H. Svensmark

    2006-01-01

    A connection between climate and the Solar system's motion perpendicular to the Galactic plane during the last 200 Myr years is studied. An imprint of galactic dynamics is found in a long-term record of the Earth's climate that is consistent with variations in the Solar system oscillation around the Galactic midplane. From small modulations in the oscillation frequency of Earth's

  10. Collisional Ring Galaxies

    NASA Astrophysics Data System (ADS)

    Appleton, P. N.

    This review will concentrate on a special class of colliding galaxy, the collisional ring galaxies (e. g. The Cartwheel). Ring galaxies are believed to owe their morphology to transient waves formed when a companion of low orbital angular momentum passes through the central regions of a disk galaxy. Collisions between gas-rich systems may have been more common in the past, and the study of nearby ring galaxies may lead to clues about transient star formation processes occurring in collisions seen at high redshift. In particular, models of the penetration of two gas-rich galaxies in a head-on collision lead to predictions of four observationally distinct time-periods in the collision. These are, (1) the initial impact and shock-heating of the disk, (2) ring development and the splattering of rapidly cooling gas into debris plumes, (3) the re-accretion of cool gas onto both galaxies and, (4) the final merger of the companion in low-energy collisions. Recent observations made over a wide range of the electro-magnetic spectrum (including ROSAT, HST and ISO observations) will be reviewed with the aim of constraining, as well as possible, the dynamical history and star formation properties of these galaxies and their companions.

  11. Ring laser angle encoder

    NASA Technical Reports Server (NTRS)

    Coccoli, J. D.; Lawson, J. R.; Mc Garty, T. P.; Nickles, J. E.

    1969-01-01

    Ring laser angle encoder with a scanning photometer autocollimator and an isolation axis, provides continuous digital readout. It measures the angular difference in inertial attitudes of target /any phenomena generating or reflecting a light beam/ two at a time relative to target one at a time.

  12. Making Molecular Borromean Rings

    ERIC Educational Resources Information Center

    Pentecost, Cari D.; Tangchaivang, Nichol; Cantrill, Stuart J.; Chichak, Kelly S.; Peters, Andrea J.; Stoddart, Fraser J.

    2007-01-01

    A procedure that requires seven 4-hour blocks of time to allow undergraduate students to prepare the molecular Borromean rings (BRs) on a gram-scale in 90% yield is described. The experiment would serve as a nice capstone project to culminate any comprehensive organic laboratory course and expose students to fundamental concepts, symmetry point…

  13. Ring Polymers Video

    NSDL National Science Digital Library

    This video explains an activity related to ring polymers. The topic is covered in relation to nanotechnology and requires background knowledge in eight grade science. The 1:30 minute video details the materials needed and steps required to complete this lesson. Visitors must complete a quick and free registration to access the materials.

  14. The ring laser gyro

    Microsoft Academic Search

    M. Faucheux; D. Fayoux; J. J. Roland

    1988-01-01

    The authors recall the basic principles and advantages of the ring laser gyro (RLG) which is the most widely developed of all optical gyroscopes based on the Sagnac effect. The main error sources which can affect RLG performances are discussed, and among them gas flows in the active medium and frequency synchronisation of counterpropagating waves or 'lock-in'. Particular attention is

  15. Ring laser gyro

    Microsoft Academic Search

    T. J. Hutchings

    1980-01-01

    A general review of laser gyros is presented. Basic concepts of the gas ring laser are reviewed. These include the 'lock-in' phenomena, geometric performance factors, and other problem areas. Various biasing methods to eliminate some of these basic problems are presented. Salient features of the laser gyro which are unique for gyro instruments are shown with data. Various laser gyro

  16. Rings by Patchy Particles

    NSDL National Science Digital Library

    Zhang, Zhenli

    2005-01-31

    Simulation Software: Glotzer Group Code Simulation Method: Brownian Dynamics A system of 90 spherical particles with two patterned linear patches at a concentration of 0.20, was run starting at an effectively infinite temperature then instantaneously quenched to a temperature of 0.33. The final equillibrium structure is rings. Simulation Model: United Atom Rigid Body with Lennard-Jones

  17. Ring of Stellar Death

    NASA Technical Reports Server (NTRS)

    2004-01-01

    This false-color image from NASA's Spitzer Space Telescope shows a dying star (center) surrounded by a cloud of glowing gas and dust. Thanks to Spitzer's dust-piercing infrared eyes, the new image also highlights a never-before-seen feature -- a giant ring of material (red) slightly offset from the cloud's core. This clumpy ring consists of material that was expelled from the aging star.

    The star and its cloud halo constitute a 'planetary nebula' called NGC 246. When a star like our own Sun begins to run out of fuel, its core shrinks and heats up, boiling off the star's outer layers. Leftover material shoots outward, expanding in shells around the star. This ejected material is then bombarded with ultraviolet light from the central star's fiery surface, producing huge, glowing clouds -- planetary nebulas -- that look like giant jellyfish in space.

    In this image, the expelled gases appear green, and the ring of expelled material appears red. Astronomers believe the ring is likely made of hydrogen molecules that were ejected from the star in the form of atoms, then cooled to make hydrogen pairs. The new data will help explain how planetary nebulas take shape, and how they nourish future generations of stars.

    This image composite was taken on Dec. 6, 2003, by Spitzer's infrared array camera, and is composed of images obtained at four wavelengths: 3.6 microns (blue), 4.5 microns (green), 5.8 microns (orange) and 8 microns (red).

  18. Muon collider ring cooler

    SciTech Connect

    Balbekov, V.I.; Van Ginneken, A.

    1998-03-01

    The possibilities of a ring cooler stage in a muon collider are explored. A basic design--along with some variations--are examined both with analytic calculations and simulation of the evolution of beam phase space and differences encountered between them are discussed.

  19. PSSC Turbo Ring Flinger

    Microsoft Academic Search

    Aaron McAlexander

    2005-01-01

    This is a description of an inexpensive version of the Thompson's jumping ring demonstration apparatus, which provides for a spectacular demonstration of Lenz's law. The device has the additional capability of being used to demonstrate the opposing nature of inductive and capacitive reactance.

  20. PSSC Turbo Ring Flinger

    NASA Astrophysics Data System (ADS)

    McAlexander, Aaron

    2005-12-01

    This is a description of an inexpensive version of the Thompson's jumping ring demonstration apparatus, which provides for a spectacular demonstration of Lenz's law. The device has the additional capability of being used to demonstrate the opposing nature of inductive and capacitive reactance.