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  • 1995-1999  (10)
  • 1880-1889  (1)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Molecular beam flux measurements and equilibria for As4, P4, As2, P2, and AsP (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 4444-4448 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dynamic equilibrium between P2, As2, and AsP at 1000 °C has been studied by mass spectrometry of fluxes from a double effusion cell. From simple ion gauge measurements of heated and unheated fluxes we determined the ionization efficiency for the dimers P2 and As2 relative to the tetramers, P4 and As4. Simultaneous mass spectrometer and ion gauge measurements of the effusion fluxes allowed the relative ionization sensitivities for P2, As2, and AsP to be determined. From the mass spectrometry data it was possible to determine the equilibrium constant 1.9±0.4 and free energy −0.55 eV molecule−1 for the process As2+P2(large-closed-square)2 AsP. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359852
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  • 2
    Electronic Resource
    Electronic Resource
    Phosphorus cracking efficiency and flux transients from a valved effusion cell (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 1664-1668 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The transient behavior of the flux from a valved effusion cell containing red phosphorus is shown to result from a low elemental sublimation coefficient (α=1.3×10−7) and not from the presence of white phosphorus in the sublimator region. The criteria for generating white phosphorus in the sublimator are given. The conversion from tetramers to dimers is modeled as a function of temperature and pressure. At higher pressures, higher temperatures are needed to convert P4 to P2. Experimental results are shown to be in qualitative agreement with results from thermodynamic equilibrium arguments. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360261
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  • 3
    Electronic Resource
    Electronic Resource
    Hosloppin, a New Pyrone-Substituted Flavonoid from Hoslundia opposita (1995)
    s.l. : American Chemical Society
    Journal of natural products 58 (1995), S. 109-111 
    Details
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/np50115a014
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Processing factor dependence of resistivity parameters of ruthenate-based thick film resistors with low temperature coefficients (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 2913-2919 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Many analog sensor and control circuits take advantage of the low (〈100ppm/°C) temperature coefficient of resistance (TCR) of thick film resistors which are based on fired ruthenate-glass nanocomposites. To manufacture resistors with even smaller TCRs, a knowledge of the effects of processing on conduction mechanism parameters is of particular importance, because TCR is fixed in firing and cannot be trimmed later to a target value, as resistance can be. The peak firing temperature and time were varied, and a special four-probe dc design was used to minimize contact and printing nonuniformities. Corresponding to a greater energy level degeneracy in larger particles, the electrostatic charging energy decreased with the observed coarsening of the resistor microstructure. For the primary data set, the charging energy decreased (at 〉95% confidence) from 1.56 to 1.15 meV with increasing firing temperature (from 845 to 855 °C) and time (from 8 to 11 min). Model-based estimation of parameters is a means to provide quantitative understanding of how TCR and underlying conduction are controlled by process factors. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368447
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  • 5
    Electronic Resource
    Electronic Resource
    Managing North American Waterfowl in the Face of Uncertainty (1995)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Ecology, Evolution, and Systematics 26 (1995), S. 177-199 
    Details
    ISSN: 0066-4162
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.es.26.110195.001141
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Quality concepts in education (1999)
    Bradford : Emerald
    The @TQM magazine 11 (1999), S. 467-473 
    Details
    ISSN: 0954-478X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Notes that professionals in education have learned from those in industry with regard to quality management concepts. Suggests that, with regard to quality concepts in universities, there are four main issues, including aspects such as incorporation of quality concepts in the curriculum and using quality concepts to improve educational administration. Notes likely improvement paths, namely: improving the business operations side of schools, and shortening the time taken to identify failing students. Lists six quality concepts for education based on quality management principles in areas such as leadership, understanding stakeholders and involvement of people. Also lists some management concepts required to provide the necessary linkages for the improvement of education, including identification of critical processes for improvement, and reporting improvements in terms meaningful to process stakeholders.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09544789910298852
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    Paper (German National Licenses)
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  • 7
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    Unknown
    The Upper Peninsula of Michigan (1882)
    New York, N.Y. : Periodicals Archive Online (PAO)
    Harper's. 64:384 (1882:May) 892 
    Details
    ISSN: 0017-789X
    Topics: General, Interdisciplinary
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:5128-1882-064-84-000011
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  • 8
    Electronic Resource
    Electronic Resource
    A rigidity theorem for group extensions (1999)
    Springer
    Archiv der Mathematik 73 (1999), S. 81-89 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. We consider the class of discrete groups which arise as fundamental groups of iterated surface fibrations; that is, of complexes obtained from a sequence of fibrations in which all bases and the initial fibre are hyperbolic surfaces. Group theoretically, this corresponds to studying the class of iterated extensions of hyperbolic surface groups. In [4], for the case of a single extension we conjectured and partially established that no group can arise from more than a finite number of such extensions. Here we show that the result holds in complete generality. As remarked in [4], the result has a strong affinity with the rigidity theorems of Parshin [7] and Arakelov [1] for fibred (complex) algebraic surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000130050371
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  • 9
    Electronic Resource
    Electronic Resource
    Cranks 0, Schoolboys 1 (1996)
    [s.l.] : Nature Publishing Group
    Nature 383 (1996), S. 774-774 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fermat's Last Theorem. By Amir D. Aczel. Four Walls Eight Windows: 1996. Pp. 147. $18, £12.99. IN his public life, Pierre de Fermat was a successful lawyer, in his private life a mathematician. He published little, and was wont to jot down his discoveries as marginal notes. Some time in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/383774a0
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    An eight-position capillary sample spinning stage for the diffractometer at BL20B at the Photon Factory (1998)
    Chester : International Union of Crystallography (IUCr)
    Journal of synchrotron radiation 5 (1998), S. 823-825 
    Details
    ISSN: 1600-5775
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: An eight-position capillary sample spinning stage has been developed for use in conjunction with the versatile vacuum diffractometer (BIGDIFF) at BL20B at the Photon Factory. BIGDIFF is often used in its powder diffraction mode using powders mounted in capillaries and up to eight imaging plates to record the diffraction pattern from the sample. Using the multiple spinning stage a number of diffraction patterns can be recorded on the imaging plates if the imaging-plate cassette is moved behind the Weissenberg screen to a new position after exposure of the sample to the beam. Not only is this system more efficient in terms of time saved in the pumping-down process, but also it has the advantage of allowing the diffraction patterns of standards to be recorded, thereby calibrating both the angle scale of the diffractometer and the intensity scales of the imaging plates absolutely.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0909049597017780
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