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981.
Hans Peter 《Mineralogy and Petrology》1948,1(2):188-190
Ohne Zusammenfassung 相似文献
982.
Hans Zinnecker 《Astrophysics and Space Science》2002,281(1-2):147-157
In this brief report we summarise the most important points raised in the course of a two-hour evening discussion session
on the above topic, organised by the author. Major questions that were debated included the universality of the IMF, the history
of the star formation rate in the solar neighorhood, the star formation efficiency in molecular clouds, and the role of triggered
star formation. The issue of a threshold gas surface density for star formation to occur was also critically discussed.
This revised version was published online in September 2006 with corrections to the Cover Date. 相似文献
983.
984.
This paper examines tourism development on Vancouver Island, B.C. in terms of the core-periphery approach to regional planning. It examines whether a core area (Victoria) is willing to share its tourism business with the rest of the island, and then focuses on the situation in a peripheral region (the Cowichan Valley Regional District–CVRD). A discriminant analysis of CVRD residents reveals they have different views regarding tourism's potential and future in their region. A follow-up analysis, reflecting a change in the scale of enquiry and local core-periphery conditions, shows residents'perceptions and priorities will change according to their respective area groupings. This analysis reveals that residents of a peripheral region, who are expected to participate in and welcome tourism development initiatives developed by senior levels of government, will in fact have different opinions regarding the industry and its potential. These differences are linked to present levels of tourism activity within the periphery and the varying community aspirations linking tourism's development potential with local needs and priorities. 相似文献
985.
Peter J. Wheatley Koji Mukai † Domitilla de Martino 《Monthly notices of the Royal Astronomical Society》2003,346(3):855-860
We present the first X-ray observations of the 4 Draconis system, consisting of an M3 III giant with a hot ultraviolet companion. It has been claimed that the companion is itself an AM Her-type binary system, an identification that places strong constraints on the evolution of cataclysmic variables. We find that the X-ray properties of 4 Draconis are consistent with the presence of an accreting white dwarf, but not consistent with the presence of an AM Her system. We conclude that 4 Draconis is therefore most likely a symbiotic binary containing a white dwarf accreting material from the wind of the red giant.
The X-ray spectrum of 4 Draconis is sometimes dominated by partially ionized photoelectric absorption, presumably due to the wind of the red giant. We note that X-ray monitoring of such systems would provide a powerful probe of the wind and mass-loss rate of the giant, and would allow a detailed test of wind accretion models. 相似文献
The X-ray spectrum of 4 Draconis is sometimes dominated by partially ionized photoelectric absorption, presumably due to the wind of the red giant. We note that X-ray monitoring of such systems would provide a powerful probe of the wind and mass-loss rate of the giant, and would allow a detailed test of wind accretion models. 相似文献
986.
Christopher Packham Keith L. Thompson Almudena Zurita Johan H. Knapen Ian Smail Robert Greimel Daniel F. M. Folha Chris Benn rew Humphrey Rene Rutten David Ciardi Matthieu Bec Richard Bingham Simon Craig Kevin Dee Derek Ives Paul Jolley Peter Moore Marti Pi i Puig Simon Rees Gordon Talbot Sue Worswick 《Monthly notices of the Royal Astronomical Society》2003,345(2):395-405
987.
Solar UV is the principal energy source impinging the atmosphere of Titan while the energy from the electrons in Saturn's magnetosphere is less than 0.5% of the UV light. Titan haze analogs were prepared by the photolysis of a mixture of gases that simulate the composition of its atmosphere (nitrogen, methane, hydrogen, acetylene, ethylene, and cyanoacetylene). The real (n) and imaginary (k) parts of the complex refractive index of haze analogs formed from four different gas mixtures were calculated from the spectral properties of the solid polymer in UV-visible, near infrared and infrared wavelength spectral regions. The value of n was constant at 1.6±0.1 throughout the 0.2-2.5 μm region. The variation of k with wavelength for the values derived for Titan has a lower error than the absolute values of k so the more significant comparisons are with the slopes of the k(λ) plots in the UV-VIS region. Three of the photochemical Titan haze analogs had slopes comparable to those derived for Titan from the Voyager data (Rages and Pollack, 1980, Icarus 41, 119-130; McKay and Toon, 1992, in: Proceedings of the Symposium on Titan, in: ESA SP, Vol. 338, pp. 185-190). The slopes of the k(λ) plots for haze analogs prepared by spark discharge (Khare et al., 1984, Icarus 60, 127-137) and plasma discharge (Ramirez et al., 2002, Icarus 156, 515-529) were also comparable to Titan's. These finding show that the k(λ) plots do not differentiate between different laboratory simulations of atmospheric chemistry on Titan in the UV-VIS near IR region (0.2-2.5 microns). There is a large difference between the k(λ) in the infrared between the haze analogs prepared photochemically and analogs prepared using a plasma discharges (Khare et al., 1984, Icarus 60, 127-137; Coll et al., 1999, Planet. Space Sci. 47, 1331-1340; Khare et al., 2002, Icarus 160, 172-182). The C/N ratio in the haze analog prepared by discharges is in the 2-11 range while that of the photochemical analogs is in the 18-24 range. The use of discharges and UV light for initiating the chemistry in Titan's atmosphere is discussed. 相似文献
988.
989.
990.
Peter H. Feldhausen 《Mathematical Geology》1970,2(2):113-129
Ordination is a multivariate technique developed by plant ecologists which has proven effective in the interpretation of paleoenvironments.
It allows gradational relationships among samples to be depicted in contrast to other quantitative techniques which classify
samples into discrete groups. In this study, ordination is used to interpret textural data for 62 bottom samples taken from
the Cape Hatteras, North Carolina, continental margin. The ordination suggests the existence of six sedimentary facies that
are similar to those obtained by cluster analysis using a dendrograph display. The facies represented are: littoral sands
and outer-shelf shelly sands; inner-shelf sands; outer-shelf sands and silts; outer-shelf slope silts; and two highly biogenic,
deep-water silt and clayey silt facies with similar characteristics. The facies are related in a qualitative manner to the
environmental processes operating off Cape Hatteras.
Chicago Bridge Technical Paper No. 5139. 相似文献