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  • 1995-1999  (86)
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  • 1
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    Evidence for interacting gas flows and an extended volatile source distribution in the coma of comet C/1996 B2 (Hyakutake) (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-08-01
    Description: Images of comet C/1996 B2 (Hyakutake) taken during its close approach to Earth show differences in the distribution of gas and dust in the inner coma and reveal two arc-shaped molecular resonant emission features. The morphology of these features, as well as the apparent decoupling gas from dust in the inner coma, suggest that an extended region of icy grains surrounds the nucleus of Hyakutake and contributes substantially to the production of volatiles. Model simulations suggest the same conclusion and indicate that the brighter arc is explainable by the presence of a trailing condensation of ice-bearing granules with a rate of volatile production approximately 23 percent of that of the nucleus.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Harris, W M -- Combi, M R -- Honeycutt, R K -- Mueller, B E -- Scherb, F -- New York, N.Y. -- Science. 1997 Aug 1;277(5326):676-81.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Space Astronomy Laboratory, University of Wisconsin, 1150 University Avenue, Madison, WI 53706, USA. wharris@sal.wisc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9235888" target="_blank"〉PubMed〈/a〉
    Keywords: Cosmic Dust ; *Gases ; Ice ; *Meteoroids ; Water
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    GEOCHEMICAL CHARACTERIZATION AND RELATIONSHIP OF OILS AND SOLID BITUMENS FROM SE TURKEY (1995)
    Wiley
    Details
    Publication Date: 1995-01-01
    Print ISSN: 0141-6421
    Electronic ISSN: 1747-5457
    Topics: Geosciences
    Published by Wiley
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  • 3
    Electronic Resource
    Electronic Resource
    Quantum transport in sputtered, epitaxial Si/Si1−xGex heterostructures (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 3954-3956 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Radio–frequency magnetron sputter epitaxy was employed for the synthesis of n–type modulation doped Si/Si1−xGex heterostructures. Si channels were grown coherently on sputtered, compositionally graded Si1−xGex buffers of low defect density, and remotely doped with phosphorus by plasma assisted gas phase doping. Magnetotransport measurements on these films revealed Shubnikov–de Haas oscillations in the longitudinal and the integer quantum Hall effect in the transverse magnetoresistance, demonstrating the presence of a two–dimensional electron gas. At T=1.6 K and sheet densities of 1012 cm−2, electron mobilities as high as 15 800 cm2/V s give evidence of the excellent structural and electronic properties achievable by the sputter growth technique. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114416
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  • 4
    Electronic Resource
    Electronic Resource
    In situ scanning tunneling microscopy study of C-induced Ge quantum dot formation on Si(100) (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 994-996 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Deposition of submonolayer coverages of C on Si(100) prior to Ge growth leads to the formation of Ge quantum dots below the critical thickness for Ge islanding on bare Si(100). In situ scanning tunneling microscopy reveals a high density of irregularly shaped islands for Ge coverages from 2.5 to 4 ML. Island sizes are broadly distributed between 10 and 25 nm. Keeping the C coverage constant and increasing the Ge coverage from 2.5 to 4 ML, the islands increase in height but their density remains constant (∼1011 cm−2). At a Ge coverage of 5.8 ML, formation of larger (105)-faceted islands is observed. Their density is reduced by a factor of 4 compared to smaller Ge coverages. Transmission electron microscopy shows that the nonfaceted islands are preserved after Si capping. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123434
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  • 5
    Electronic Resource
    Electronic Resource
    SN Ia: Light Curves, Spectra and Ho (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 759 (1995), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1995.tb17561.x
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  • 6
    Electronic Resource
    Electronic Resource
    Akima Interpolation: a Tool used in Direct Slit-Length Desmearing Procedures of Non-Frequency-Limited X-ray Scattering Curves (1995)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 28 (1995), S. 38-42 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: X-ray small- and medium-angle scattering of partially ordered or semicrystalline materials is composed of background scattering from the form scattering of the components and from the amorphous phase and of peaks from the scattering of the crystallites. By the slit geometry of X-ray diffractometers constructed for registration of small- and medium-angle X-ray scattering, the diffuse scattering and the peaks are distorted and the peak positions and half-widths are changed. A program module based on the Akima interpolation [Akima (1970). J. Assoc. Comput. Math. 17, 589–602] is proposed for calculation of the first derivative of the complete smeared scattering curve, which is then explicitly used in direct collimation correction procedures. The desmearing of scattering curves from semicrystalline starch samples proves the convenience of the method for low-noise conditions and exhibits a significant gain of measuring time in comparison with data of comparable accuracy but measured with Soller-slit collimation systems or desmeared with direct methods using frequency filtering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889894008319
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  • 7
    Electronic Resource
    Electronic Resource
    A distance measure based on binary character data and its application to phylogeny reconstruction (1996)
    Springer
    Bulletin of mathematical biology 58 (1996), S. 449-469 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract An essentially new method to relate a number of taxa on the basis of a predefined set of dichotomous properties (i.e. either present or not present) is described. The basic step of the analysis is the derivation of a sophisticated distance measure to describe the pairwise dissimilarities quantitatively on the basis of the individual properties. The presentation of the dissimilarity matrix by a tree-like structure is an obvious step implicated by the the distance measure and is related to the widely used method of successive joining of nearest neighbors with respect to the distances. The distance measure makes no use of stochastic or other mathematical models of evolutionary processes and can be interpreted best in terms of discrete information theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02460592
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  • 8
    Electronic Resource
    Electronic Resource
    Phylogenetic relationship of organisms obtained by ribosomal protein comparison (1997)
    Springer
    Cellular and molecular life sciences 53 (1997), S. 34-50 
    Details
    ISSN: 1420-9071
    Keywords: Key words. Evolution; phylogenetic tree; eubacteria; archaea; eukarya; proteins.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. The evolutionary relationships of ribosomal proteins from eubacteria, archaea, eukaryotes, chloroplasts and mitochondria were examined by their degree of conservation, their structural and functional properties and by the occurrence of conserved structural elements. The structural domains formed by the different protein families were studied. The occurrence of monophyletic groups was investigated for each protein family within the archaea. Phylogenetic trees were constructed between these organisms and together with the homologous sequences of the other phylogenetic domains. All organisms belonging to the archaea clearly formed a monophyletic group. The conserved sequence motifs were checked for the potential to form similar secondary structural elements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00000578
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  • 9
    Electronic Resource
    Electronic Resource
    Sediment retention in encrusting Palythoa spp.—a biological twist to a geological process (1997)
    Springer
    Coral reefs 16 (1997), S. 39-46 
    Details
    ISSN: 1432-0975
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract.  Carpet sea anemones of the genus Palythoa are common inhabitants of reef crest environments in the Florida Keys reef tract. Through a unique assimilation mechanism, Palythoa spp. entomb carbonate sediment within their tissues. The amount of sediment assimilated is significant, averaging almost 45% of wet tissue weight. Palythoa spp. assimilate all available minerals on the reef. Aragonite, magnesium calcite, calcite and minor quantities of siliciclastic components are all assimilated in proportions comparable to their content in adjacent sediment sinks. There is also no preference in terms of skeletal composition; coral grit, coralline red algae, Halimeda and other allochems are all equally assimilated into Palythoa spp. tissue. The only preference is particle size. Sediment extracted from tissue samples is generally ?125 μm in size, far finer than ambient sediment found adjacent to Palythoa spp. colonies (predominantly 〉500 μm). Much of the finest sediment extracted from Palythoa spp. tissue is composed of elongated crystal aggregates of aragonite. These particles appear to have been produced in situ through biologically influenced mineralization. Aggregates nucleated on exogenous sediment and attained their elongated form as assimilation proceeded. When Palythoa spp. colonies die, the assimilated sediment and the crystal aggregates are released back into the reef environment. The eventual fate of this material has yet to be determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003380050057
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  • 10
    Electronic Resource
    Electronic Resource
    Evidence for High Vacancy Concentrations in Heavily Doped N-Type Silicon from Mossbauer Experiments (1995)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 196-201 (Nov. 1995), p. 1117-1122 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/01/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.196-201.1117.pdf
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