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  • 1
    Electronic Resource
    Electronic Resource
    Search for Resonant States in Positron Electron Scattering (1992)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 105-110 (Jan. 1992), p. 529-532 
    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/2011/0528/01/59/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.105-110.529.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    High Current Pulsed Positron Microprobe (1997)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 255-257 (Sept. 1997), p. 644-646 
    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/2011/0528/02/02/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.255-257.644.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    An electron diffraction study of alkali iodide vapors (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 6053-6057 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The structures of NaI, KI, RbI, and CsI in the vapor phase were determined via standard electron diffraction counting techniques with nozzle temperatures ranging from 770–866 K. The data analysis yielded the structure parameters and the ratio of the monomeric to dimeric compounds. The mean amplitudes of vibration for the monomeric molecules were held at values based on microwave frequencies and the harmonic potential approximations. The corrected monomer distances re agree well with microwave-spectroscopy results. Rhombic geometries with bonded dimer distances ranging from 3.00 to 3.57 A(ring) and I–M–I angles that ranged from 95° to 102° were observed. The dimer mole fraction in the vapor varied from 3% to 18%. There was no significant amount of any trimeric species observed in the vapor. The bonded distance of KI was found to be equal to the interionic separation of the crystal. The observed dimer mole fractions were compared with various theoretical predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455419
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  • 4
    Electronic Resource
    Electronic Resource
    An electron diffraction study of alkali fluoride vapors (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 6058-6063 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The structures of NaF, KF, RbF, and CsF in the vapor phase were determined via standard electron diffraction counting techniques with nozzle temperatures ranging from 798 to 1123 K. The reactivity of the fluorides combined with the higher temperature requirements necessitated a new nozzle design as well as modification to the oven. The data analysis yielded the structure parameters and the ratio of monomeric to dimeric compounds. The mean amplitudes of vibration of the monomeric molecules were held at values based on microwave frequencies and the harmonic potential approximation. The corrected monomer distances re agree well with microwave-spectroscopy results. Rhombic geometries with bonded dimer distances ranging from 2.08 to 2.70 A(ring) were observed. The F–M–F bond angles were found to be nearly constant, varying only from 82.2° to 85.5°. The dimer mole fractions in the vapor were observed to vary from 5% to 18%. There were no significant amounts of any trimeric species observed in the vapor. The observed dimer mole fractions were compared with existing measurements from velocity selection experiments and found to be in excellent agreement. The dimer mole fractions were also compared with various theoretical predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455420
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  • 5
    Electronic Resource
    Electronic Resource
    An electron diffraction study of alkali bromide vapors (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 5477-5482 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The structures of NaBr, KBr, RbBr, and CsBr in the vapor phase were determined via standard electron diffraction counting techniques with nozzle temperatures ranging from 820–920 K. The data analysis yielded the structure parameters and the ratio of the monomeric to dimeric compounds. The mean amplitudes of vibration for the monomeric molecules were held at values based on microwave frequencies and the harmonic potential approximations. The corrected monomer distances re agree well with microwave–spectroscopy results. Rhombic geometries with bonded dimer distances ranging from 2.74 to 3.37 A(ring) and Br–M–Br angles that ranged from 85° to 101.6° were observed. The percentage of dimer in the vapor was found to vary from 7% to 18%. The most surprising result was the large value obtained for the KBr dimer bonded distance. It is substantially larger than predicted by current theories and is nearly as large as the interionic distance in the crystal. Thermodynamic calculations were performed to allow comparisons of the dimer mole fractions observed with values derived from existing structure models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453666
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  • 6
    Electronic Resource
    Electronic Resource
    A Study of Craniolacunia (1943)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 50 (1943), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1943.tb05961.x
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  • 7
    Electronic Resource
    Electronic Resource
    Textbook design: current status and future directions
    Amsterdam : Elsevier
    International Journal of Educational Research 14 (1990), S. 533-541 
    Details
    ISSN: 0883-0355
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Education
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0883-0355(90)90023-2
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  • 8
    Electronic Resource
    Electronic Resource
    From creation to chaos. Classic writings in science - Edited by Bernard Dixon. Pp. 280. Basil Blackwell, Oxford. 1989. £15.00
    Amsterdam : Elsevier
    Endeavour 14 (1990), S. 102 
    Details
    ISSN: 0160-9327
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0160-9327(90)90099-D
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  • 9
    Electronic Resource
    Electronic Resource
    A guide to scientific writing - By David Lindsay. Pp. 83. Longman, Harlow, U.K. 1990. Paperback £4.95
    Amsterdam : Elsevier
    Endeavour 14 (1990), S. 201 
    Details
    ISSN: 0160-9327
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0160-9327(90)90048-V
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  • 10
    Electronic Resource
    Electronic Resource
    An electron diffraction study of alkali chloride vapors (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 4418-4426 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Monomers and dimers of the four alkali chlorides NaCl, KCl, RbCl, and CsCl have been studied in the vapor phase using the counting method of high energy electron diffraction. Nozzle temperatures from 840–960 K were required to achieve the necessary vapor pressures of approximately 0.01 Torr. Large mean amplitudes of vibration (as big as 0.26 A(ring)) and the similarity of the monomer and dimer bonded distances complicate the analysis, although the refined structures yield good fits to the data, especially for the stronger scatterers RbCl and CsCl. Using harmonic calculations for the monomer and dimer l values, a consistent set of structures for all four molecules is obtained. The corrected monomer re distances reproduce the microwave values very well. The planar rhombic structure of the dimers shows a uniform decrease of the Cl–M–Cl angle as the alkali M increases in size. For the better data sets some of the l values were refined to gain perspective on the validity of the calculated ones. The experiment also yields information on the amount of dimer present in the vapor, and these results are compared with thermodynamic values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449060
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