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  • 1985-1989  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Application of finite element and boundary integral methods in molecular collision theory. I. Introduction and model calculations (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 6938-6954 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The adaptive multigrid technique in the finite element method of the solution of partial differential equations is examined in the context of model problems in atom–atom and collinear atom–diatom collisions. For the problem leading to scattering along an L-shaped region, it yields accurate results for regions of energy far from threshold for excitation of a new channel without inclusion of virtual states. Close to threshold, the cusp-like structure of the transition probability (vs energy) and the time delay associated with the onset of a resonance are recovered only by inclusion of the new (closed) channel in the finite element solution. For atom–diatom collinear collisions, use of an orthogonal coordinate system facilitates discretization and adds no extra labor in the finite element method, compared to the usual mass-weighted system. In such collisions, where the threshold behavior of the transition probability resembles the presence of a bound-state resonance below the threshold, the no-virtual-state solution is shifted in energy relative to the converged one-virtual-state solution. Under certain circumstances, transition probabilities from the former solution are found to deviate substantially from those determined from the latter in energy regions well below threshold. The multigrid method of solution of the finite element equation is found to be accurate provided a sufficiently fine grid is employed for the coarsest level of the multigrid adaptive solution process. However, for the problems studied, when the solution obtained from the coarsest grid does not yield a sufficiently accurate interpolated initial approximation for the relaxation method of solution of the finer grid levels, this method was found to converge to erroneous solutions. In future work, techniques examined herein will be applied to molecular scattering problems involving collisional dissociation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454391
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A comparison of triazolam and diazepam as premedication agents for minor gynaecological surgery (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 40 (1985), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Triazolam 0.25 mg, diazepam 10 mg and placebo were compared in a randomized double-blind trial of oral premedication in 90 patients undergoing minor gynaecological surgery. Both triazolam and diazepam produced a significant sedative effect as measured by patient serf assessment linear analogue scales but only diazepam was more anxiolytic than placebo. Psychomotor performance assessed by the letter-search test at 3 and 6 hours after awakening showed a decrement in performance in patients receiving triazolam at 3 hours compared with the two other groups. Triazolam was shown to have a pronounced amnesic effect and whilst it might be used for premedication, its lack of anxiolysis coupled with a significant impairment of psychomotor performance at 3 hours after awakening, render the drug unsuitable for premedication in the short stay patient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1985.tb10784.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Isotope dating of the Australian regolith (1989)
    [s.l.] : Nature Publishing Group
    Nature 337 (1989), S. 22-22 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIRá€"The work reported1 by Bird and Chivas is based on three assumptions: (1) that materials recognized as forming deeply weathered profiles have been formed at some time in the past, on landscapes of low relief under tropical conditions; (2) that the date of such intense periods ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/337022a0
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  • 4
    Electronic Resource
    Electronic Resource
    Soil color and surface residue effects on seedling light environment (1987)
    Springer
    Plant and soil 97 (1987), S. 295-298 
    Details
    ISSN: 1573-5036
    Keywords: Blue light ; Conservation tillage ; Reflected light ; Seedling growth ; Soil color
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary The quantity and spectral distribution (quality) of reflected light 10 cm above dry, wet and plant residue-covered soils were compared over black, brick-red, and gray-white soils. Photosynthetic photon flux density of reflected light ranged from about 4% of direct sunlight over bare, wet black soil to 21% over dry near-white soil. Plant residue on the soil surface increased the reflected light over the black soil and decreased it over the light-colored soils. The amount of reflected blue light was greatest over the whitest soil. When soil temperature differences were eliminated by insulation panels, stems of southern pea [Vigna unguiculata (L.) Walp.] seedlings elongated less over white surfaces than over black surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02374954
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    Paper (German National Licenses)
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