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  • 1
    Electronic Resource
    Electronic Resource
    Antifertility agents. 38. Effect of the side chain and its position on the activity of 3,4-diarylchromans (1983)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 26 (1983), S. 592-595 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00358a026
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  • 2
    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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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Low-dose nitrogen implants in 6H–silicon carbide (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 76 (2000), S. 1896-1898 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low-dose n-type nitrogen implants in 6H–SiC have been studied using the Hall effect. Previous studies of doping by implantation in SiC have concentrated on heavily doped layers such as required for transistor sources and drains. Here, we focus on more lightly doped layers, e.g., such as required for the active regions of high-voltage power devices. The low-dose N implants are found to activate more readily than high doses. Almost ideal N-implanted layers with a donor density of ∼1×1017/cm3 and a low residual acceptor density from implant damage of only ∼1.5×1015/cm3 have been obtained after a 1400 °C anneal. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.126204
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  • 7
    Electronic Resource
    Electronic Resource
    The Coal Char Reaction with CO2-CO Gas Mixtures (1980)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 19 (1980), S. 364-371 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i260075a006
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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    Automatic 1-D Inversion of Magnetotelluric Data By the Method of Modelling (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 112 (1993), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Two popular methods for obtaining a preliminary 1-D geo-electric model from magnetotelluric data are the simple inversion algorithms due to Niblett, Bostick or Schmucker, and the modelling scheme of Fischer & LeQuang. the former provides resistivity values at different depths, while the latter uses an optimizing program to obtain the resistivities and thicknesses of a prescribed number of layers which give a best-fitting response to the given data. the present scheme combines features of both methods by using Niblett inversion to provide an initial resistivity profile from which, successively, 2, 3, 4,… layer models are constructed automatically. the algorithm provides a response with minimum misfit for each layered model according to the method of Fischer & LeQuang, and uses a statistical F-test to determine when the inclusion of additional layers is no longer justified by the improvement of fit. the method therefore provides a best-fitting ‘least-layered’ model consistent with the given data without the human intervention required by the Fischer-LeQuang scheme. Some examples of its application to both synthetic and real data are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1993.tb01441.x
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  • 10
    Electronic Resource
    Electronic Resource
    IMF effects on short-period fluctuations at low latitudes (1978)
    [s.l.] : Nature Publishing Group
    Nature 272 (1978), S. 517-518 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] As the variations in the equatorial region are highly time-dependent, pairs of low-latitude and equatorial stations have been chosen for analysis from widely separated longitudinal zones-American zone (Huancayo, Fuquene), African zone (16DIR, lat. 9.6N, long. 41.87?, dip. lat. 0.20, a temporary ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/272517a0
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