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  • 1
    Digitale Medien
    Digitale Medien
    Thermophysical Properties of Some Key Solids (1994)
    Springer
    International journal of thermophysics 15 (1994), S. 1333-1343 
    Details
    ISSN: 1572-9567
    Schlagwort(e): absolute thermopower ; evaluated data ; electrical resistivity ; heat capacity ; thermal conductivity ; thermal expansion ; Al2O3 ; Cu ; Fe ; Pt ; Si ; Pb ; W
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract In 1995 the Committee on Data for Science and Technology (CODATA) published a Report of its Task Group on Thermophysical Properties of Solids which analyzed available data on, and gave recommended values for, the heat capacity of Al2O3, Cu, W, and Fe, the thermal expansion of Cu. Si, W, and Al2O3, the electrical resistivity of Cu, Fe, W. and Pt, the thermal conductivity of AI, Cu, Fe, and W, and the absolute thermopower of Pb, Cu, and Pt, The Chairman of the Task Group was Professor Y. S. Touloukian. until his death in 1981, and later was Dr, Merrill Minges, Since that publication there have been more measurements of heat capacity (Cu), thermal expansion (Si and W), and thermopower (W). particularly at high temperatures with subsecond techniques, which have led us to reanalyze some of the data and change some “recommended” values, Revised tables and some algebraic expressions are presented here.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01458841
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  • 2
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    MM and subMM molecular line observations of the southwest lobe of L1551: Evidence of a shell structure (1986)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: Observations have been made of the southwest outflow lobe of L1551 in several millimeter and submillimeter molecular lines. Maps have been made in the J=3-2 and J=2-1 transitions of CO over areas of 7.5 by 2.5 arc minutes and 5 by 5 arc minutes respectively at UKIRT. More detailed maps have also been made in the J=2-1 CO transition over an area of about 6 by 3.5 arc minutes at the NRAO 12m telescope. Additional observations of the J=4-3 transitions of HCN, HCO(+) abd H(13)CO(+) were made at selected positions. The HC(+) J=4-3 transition was detected at several positions along the outflow axis and at the position of IRS 5. Similarly the HCN J=4-3 transition was detected at the position of IRS 5 and also at a position close to HH29. However, the J=4-3 transition of H(13)CO(+) was bit detected at the position of IRS 5 even through it was observed at the position close to HH29 with a peak corrected antenna temperature of 0.23K at a V(LSR) of 1 km s(-1). The detection of the J=4-3 transitions of both HCO(+) and H(13)CO(+) close to the position of HH29 suggest the presence of very dense gas in this region. LVG analysis of the various molecular lines observed give a kinetic temperature between 10 and 15K and a density from 10(5) to 10(6) cm(-3) at the position of IRS 5 at the ambient cloud velocity. At the position close to HH29 LVG analysis of the CO observations gives a density between 10(3) and 10(4) cm(-3) at a kinetic temperature of 25k for a V(LSR) of 0 km s(-1). To the southwest of HH29 there is a large decrease in both the linewidth and intensity of CO emission. This may be due to the interaction between the outflow and a dense clump of gas which gives rise to HH29. The maps of the CO J=3-2 and CO J=2-1 emission integrated in 3.25 km s intervals show the shell structure postulated by Snell and Schloerb (1985).
    Schlagwort(e): ASTROPHYSICS
    Materialart: NASA. Ames Research Center Summer School on Interstellar Processes; Abstracts of Contributed Papers; p 3-4
    Format: application/pdf
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  • 3
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    Submillimetre molecular line observations of M17: The interaction of an ionisation front and molecular clouds (1986)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: An area of about 9 by 10 arc minutes in the M17 molecular cloud has been mapped in the J=3-2 transition of CO. The strongest CO emission is observed to come from the two bars to the north and southwest, which lie just outside the area of ionized gas seen in the radio continuum studies. We are viewing the boundary between the ionized and molecular gas almost edge on. The most intense CO emission is from the area around the dense molecular cloud core M17SW in the southwest bar. To the east of M17SW there are signs of recent or continuing star formation including H2O masers and an ultra-compact HII region. The CO J=3-2 spectra observed are complex with considerable variation in line shapes occuring over distances of less than one arc minute. We interpret the velocity structure of this region as arising from an ensemble of molecular cloud fragments in addition to extended emission. We have identified several cloud components at different velocities within both the northern and southwest bars of CO emission. A simple kinematic model of the cloud components in the southwest bar in which they are considered to be clumps of post-shock gas lying close to the edge of the expanding HII region, with the shock being driven by Kleinmann's star, gives a velocity of approx. 10.8 km s(-1) for the expansion velocity of the HII region, which is currently at a distance of approx. 2.4 pc from Kleinmann's star. The resulting shock is thought to be preceding the ionisation front and appears to have led to the fragmentation of the original cloud.
    Schlagwort(e): ASTROPHYSICS
    Materialart: NASA. Ames Research Center Summer School on Interstellar Processes: Abstracts of Contributed Papers; p 33-34
    Format: application/pdf
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  • 4
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    A radio optical reference frame. III - Additional radio and optical positions in the Southern Hemisphere (1992)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-12
    Beschreibung: Radio and optical positions are presented for southern hemisphere extragalactic sources from the Parkes 2.7 GHz survey. Sixty-one sources were observed with Mark III VLBI at 8.4 GHz between Tidbinbilla, Australia, and Hartebeesthoek, South Africa. The results presented are part of the effort to establish a global reference frame of 400 extragalactic radio sources. Radio positions with about 10 milliarcsec errors have been estimated for 39 sources not previously in the present radio reference frame catalog, and provisional positions were obtained for two additional sources, bringing the total number of catalog sources to 276. The principal source of error is the uncalibrated ionosphere. Of the remaining sources five were completely undetected, six were either too faint or too resolved, and nine had previous catalog positions. Optical positions on the FK5 system have also been measured for four southern sources using prime focus plates from the Anglo-Australian 4 m telescope with an accuracy of 0.06 arcsec. This raises to 40 the number of radio sources with accurately measured positions for their optical counterparts.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astronomical Journal (ISSN 0004-6256); 103; 6 Ju
    Format: text
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