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  • 1995-1999  (3)
  • 1985-1989  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Studies in antifertility agents. 50. Stereoselective binding of d- and l-centchromans to estrogen receptors and their antifertility activity (1986)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 29 (1986), S. 1801-1803 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00159a044
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Space charge effects in the Paul trap (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 3569-3572 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The effects of finite space charge on the equilibrium characteristics of charges confined in a Paul trap are investigated. It is found that space charge introduces two effects that have opposing influences on the confining pseudopotential well. The effect of electrostatic repulsion between like charges is to make the potential well shallower, but the plasma collective response can lead to a deepening of the well. Illustrative numerical solutions of thermal equilibria as well as an approximate analytical equilibrium are discussed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.871055
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Comparison of the annealing behavior of high-dose nitrogen-, aluminum-, and boron-implanted 4H–SiC (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 2026-2028 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Room temperature free carrier concentrations exceeding 1×1018 cm−1 have been achieved with 1000 °C implants into 4H–SiC using N and Al (1×1017 cm−3 using B). A decrease in resistivity is observed for annealing temperatures above ∼1300, ∼1500, and ∼1750 °C for N, Al, and B, respectively. Rutherford backscattering spectroscopy measurements indicate almost complete recrystallization for N-implanted samples and partial recrystallization on the silicon, but not the carbon, sublattice for B- and Al-implanted samples. An implant and species related step formation is also observed. Only boron is observed to diffuse appreciably. A crystal stoichiometry and Fermi level dependent model is proposed to explain the activation results. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121681
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    C-Nor-9,11-secoestranes as modified estrogens and fertility regulation (1988)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 31 (1988), S. 1261-1264 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00401a033
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Improved methods for solving for the magnetic field in E-polarization induction problems with fixed and staggered grids (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 126 (1996), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Solving by finite differences for the magnetic field in an E-polarization induction problem is an unorthodox approach because it is simpler to obtain the solution for the single component of the electric field, from which the two magnetic components are readily found by differentiation. Nevertheless, when the E-polarization model appears as the 2-D limit on the boundary of some general 3-D problem in which a finite-difference method is being used to solve for the magnetic field, then the unorthodox approach arises quite naturally. In a previous paper on this subject, it was shown that this problem is beset with numerical difficulties, and a 9-point formula which incorporated the divergence-free nature of the magnetic field was proposed as a way of eliminating numerical instabilities and improving the accuracy of calculation for certain extreme models. For others, however, namely those with very high conductivity contrasts near the surface, it has since been found that even the 9-point formulae are not very accurate. Here we report on further improvements to the finite-difference formulae which lead to accurate results for these types of models while still preserving all the advantages offered by the previous modifications. Two methods are described and compared. In the first, a standard fixed grid is used and new 9-point formulae are derived which give both magnetic field components at each node, and a simpler and more effective finite-difference equation is obtained for one of the surface boundary conditions. In the other approach, a staggered grid is used in which the electric and two magnetic components each have their own grid points. Methods are also developed for calculating the surface electric field from the magnetic field solutions obtained on both types of grid. Calculations arc performed for two different models which represent the types of configurations that have caused numerical problems in the past. It is found that both approaches give excellent results when compared with those generated by standard 2-D finite-difference programs which solve directly for the electric field, and since the numerical problems overcome are similar to those found in a general 3-D induction problem, it is concluded that fixed grids could also be used in three dimensions with an accuracy comparable to that provided by staggered grids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1996.tb05301.x
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of ethionine on hepatic mitochondrial and microsomal calcium uptake (1988)
    Springer
    Bulletin of environmental contamination and toxicology 40 (1988), S. 287-293 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01881053
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Generating functions for a class ofq-polynomials (1989)
    Springer
    Annali di matematica pura ed applicata 154 (1989), S. 99-109 
    Details
    ISSN: 1618-1891
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary Some simple ideas are used here to prove a theorem on generating functions for a certain class of q-polynomials. This general theorem is then applied to derive a fairly large number of known as well as new generating functions for the familiar q-analogues of various polynomial systems including, for example, the classical orthogonal polynomials of Hermite, Jacobi, and Laguerre. A number of other interesting consequences of the theorem are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01790345
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Studies on the enhancement of separation characteristics of sulfonated poly(phenylene oxide)/polysulfone thin film composite membranes for reverse osmosis applications. I. Effect of chemical treatment (1988)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 163 (1988), S. 1-13 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Der Einfluß einer chemischen Behandlung von dünnen Filmen einer Composit-Membran aus sulfoniertem Polyphenylenoxid wurde untersucht. Über den Einfluß der Konzentration von wáßrigen Lösungen von Formaldehyd, Schwefelsäure, Salzsäure, Phosporsäure, Natriumhydroxid sowie der Behandlungsdauer auf die Trenncharakteristik der inversen Osmose der Composit-Membranen mit einer Ionenaus-tauschkapazität von 2,14 und 2,50 meq/g in verschiedenen Kombinationen wird ausführlich berichtet. Die Ergebnisse zeigen, daß unter den besten chemischen Behandlungsbedingungen eine Erhöhung der Trenncharakteristik der inversen Osmose der sulfonierten Polyphenylenoxid/Polysulfon-Composit-Membran erreicht wird.
    Notes: The effect of chemical treatment on the reverse osmosis (RO) separation characteristics of sulfonated poly(phenylene oxide) (SPPO) thin film composite membranes was investigated. The effects of the concentrations of aqueous solutions of formaldehyde, sulfuric acid, hydrochloric acid, phosphoric acid, sodium hydroxide, and treatment time on the RO separation characteristics of the composite membranes with ion exchange capacity (IEC) of 2.14 and 2.50 meq/g in various combinations are reported in detail. The results indicate some enhancement in RO separation characteristics of the SPPO/polysulfone (PS) composite membrane under the best conditions of the chemical treatment.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1988.051630101
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  • 9
    Electronic Resource
    Electronic Resource
    Studies on the enhancement of separation characteristics of sulfonated poly(phenylene oxide)/polysulfone thin film composite membranes for reverse osmosis applications. II. Effects of nitromethane and the chemical treatment combined with gamma-ray irradiationPart I cf. lit.3. (1988)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 163 (1988), S. 15-21 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Bei der Herstellung dünner Filme von sulfonierten Polyphenylenoxid/Polysulfon (SPPO/PS)-Composit-Membranen wurde untersucht, daß ein Zusatz von Nitromethan zu einer Lösung von sulfoniertem Polyphenylenoxidnatrium erhöhte Wirkung auf die Trenncharakteristik der inversen Osmose besitzt. Der Einfluß von gamma-Strahlung auf dünne Filme der Composit-Membran unter nassen und trockenen Bedingungen wurde ebenfalls untersucht. Um die maximal mögliche Verbesserung zu erreichen, wurden die Composit-Membranen einer kombinierten chemischen und Gammastrahlen-Behandlung unter nassen und trockenen Bedingungen unterworfen.Die experimentellen Ergebnisse dieser kombinierten Behandlung zeigen, dalß die SPPO/PS Composit-Membran dabei abgebaut wird.
    Notes: The enhancement effect of the addition of nitromethane into the coating solution of sulfonated sodium poly(phenylene oxide) (SPPONa) polymer for the synthesis of sulfonated poly(phenylene oxide)/polysulfone (SPPO/PS) thin film composite membranes on reverse osmosis (RO) separation characteristic was studied. The effect of gamma-ray irradiation on the SPPO/PS thin film composite membranes was also evaluated when the membrane samples were in the wet and dry conditions. The composite membranes were also subjected to a chemical treatment combined with gamma-ray irradiation in both wet and dry conditions in the hope of obtaining the maximum possible enhancement under each treatment. However, the experimental data of this combined treatment indicated the possibility of some degradation of the SPPO/PS composite membranes.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1988.051630102
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