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  • Articles: DFG German National Licenses  (9)
  • 1985-1989  (9)
Source
  • Articles: DFG German National Licenses  (9)
Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Local spin-density functional theory of noncollinear magnetism (invited) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3482-3486 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We apply spin-density functional theory (SDF) to describe noncollinear magnetism; i.e., self-consistent energy-band calculations based on the local approximation to SDF theory are presented in which the magnetization associated with different atoms in a unit cell is allowed to point along different, noncollinear directions. In contrast to older work (e.g., by You and Heine and by Oguchi, Terakura, and Hamada) the present calculations are (1) self-consistent, (2) provide the total energy, and (3) provide the spin-quantization axes. In our applications we deal with noncollinear antiferromagnets γ-FeMn and perovskites Mn3GaN and show that their total energies are minimized in tetrahedral and triangular magnetic structures, respectively, first proposed by Kouvel and Kasper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340744
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Selective oxygen leak (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Anaesthesia 41 (1986), S. 0 
    Details
    ISSN: 1365-2044
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A case is described where a patient received less oxygen than was set on the Rotameters. The cause was traced to a selective leak of oxygen via an open cyclopropane needle valve. Several recommendations are put forward to prevent a recurrence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2044.1986.tb12964.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Transition-metal monoxides: Band or Mott insulators? (invited; abstract) (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3042-3042 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We argue that the widely held view that the transition-metal monoxides are Mott insulators is incorrect. Self-consistent spin-polarized energy-band calculations indicate that MnO and NiO are ordinary band insulators, and that FeO and CoO, while conducting in the local-spin-density approximation, satisfy the condition required for insulating behavior due to the development of an orbital magnetic moment. Our picture of the monoxides is supported by a variety of experimental data. The fundamental question raised by this work is the importance of charge fluctuations, or equivalently, of ionic configurations. The distinction between our band picture and the conventional picture based on ionic configurations (the energy price for which is the Coulomb integral "U'') is particularly clear for the variation of the Néel temperature across the monoxide series. Perturbation theory indicates that T(Néel) varies inversely with U in the conventional theory, but inversely with the exchange splitting in the band picture. Since the exchange splitting tends linearly toward zero across the series, whereas U is constant or increases, the increase by a factor of five of T(Néel) across the series is more naturally explained by the band picture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335206
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Intra-vascular thrombosis associated with dental ultrasound (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 16 (1987), S. 0 
    Details
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract Ultrasonic instruments used in dentistry generally operate at frequencies of 25 to 42 kHz. A wire oscillating at these ultrasonic frequencies immersed in a liquid produces local flow patterns termed acoustic microstreaming. Large shear forces are produced which arc able to rupture erythrocytes and platelets both in vitro and in vivo. This results in activation of the blood coagulation system with subsequent thrombus formation. The probe tip of an ultrasonic sealer was positioned to touch a mammalian mesenteric artery. The probe was operated for 10 to 20 s at a displacement amplitude of 15 μm. Acoustic microstreaming occurred which disturbed blood flow and this microstreaming ceased when the power was switched off. After continued operation of the probe, thrombi were formed against the vessel wall with fragments embolising downstream. These thrombi eventually grew to occlude the vessel. Furthermore, an in situ model demonstrated that acoustic energy was transmitted through the tooth during typical ultrasonic scaling procedures. As a consequence of these observations, it is possible that acoustic microstreaming fields may be generated within the blood vessels entering the tooth apex which arc large enough to induce platelet damage. Therefore there is a potential hazard from the use of the ultrasonic sealer which may induce similar thrombi formation within the pulpal or perapical tissues of the teeth. If this were to occur it could result in tooth death which might not become evident until a long time after the ultrasonic exposure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0714.1987.tb01489.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The air-powder dental abrasive unit—an evaluation using a model system (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 14 (1987), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Air-powder abrasive systems are used in dentistry to remove dental plaque, calculus and stain from the surfaces of teeth. A model system consisting of a thin layer (14 μm) of vacuum-deposited aluminium was used to demonstrate the effectiveness of such a system. Photomicrographic analysis showed two distinct areas of removal: an inner area where removal of aluminium was complete, surrounded by an area where removal was incomplete.With the aid of a relocation pin attached to the nozzle of the instrument it was demonstrated that nozzle–target distance, the air pressure input, the flow of water and the time of operation were all factors which affected the clinical efficiency of the instrument.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1987.tb00692.x
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Dental plaque removal by cavitational activity during ultrasonic scaling (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of clinical periodontology 15 (1988), S. 0 
    Details
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract. Photomicrographs of the surfaces of recently extracted teeth stained with erythrosin dye were obtained. The stained surfaces were treated with an ultrasonic sealer using two different types of scaling tips driven by the same instrument operated at a medium power setting. Small areas of stained plaque removal occurred when the stationary scaling tip was operated without water cooling. Additional areas of removal were observed where a water coolant was present, which were larger than those produced by the non-water cooled tip. These additional areas were influenced by the type of scaling tip used, it's orientation to the tooth surface and it's displacement amplitude. Cavitational activity in the cooling water supply of the ultrasonic sealer is able lo remove dental plaque from tooth surfaces and may be a useful adjunct to the mechanical action of the instrument.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-051X.1988.tb02126.x
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Effect of uranium on growth and reproduction of the marine amphipod Allorchestes compressa (1986)
    Springer
    Marine biology 93 (1986), S. 459-464 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Experiments on growth of the marine amphipod Allorchestes compressa Dana were carried out over four weeks, and both growth and reproduction were studied over three generations, each of which was exposed to uranium for approximately 10 wk. At 0.1 mg l-1 the uranium increased growth by 23%, as measured by the mean weight after 4 wk, and at 2 mg l-1 growth was reduced by 28% compared with the control. A. compressa accumulated uranium from sea water with a concentration factor of 10. There was no effect of uranium on the survival of amphipods or their progeny in the multiple-generation experiment, but the numbers of males, the sex ratio, and the respiration rate (measured on males only) at 1mg l-1 were significantly lower than the control. A. compressa is shown to be a convenient species for the study of toxic effects on growth and reproduction using multiple-generation experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00401114
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Measurement of anomalously high hydration of (dA) n · (dT) n double helices in dilute solution (1989)
    [s.l.] : Nature Publishing Group
    Nature 340 (1989), S. 321-322 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Ultrasound velocity and density measurements have been used widely to estimate the hydration of ions10, simple molecules, and polymers in dilute solution11. The development of a more sensitive small-scale version of this technique enabled us to investigate the details of the hydration of DNA. This ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/340321a0
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Kinetics of uranium uptake by the crab Pachygrapsus laevimanus and the zebra winkle Austrocochlea constricta (1989)
    Springer
    Marine biology 101 (1989), S. 323-327 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The crab Pachygrapsus laevimanus and the zebra winkle Austrocochlea constricta were exposed for 40 d to uranium (1.5 to 10 mg l-1) in continuous-flow sea water in separate starved and fed treatments, and the kinetics of uranium bioaccumulation were estimated from an exponential model. Starved and fed crabs took up U at a similar rate, which suggests that sea water was the major source of U to the crab; the fed crabs excreted U more rapidly than the starved crabs and this led to a lower net uptake of U by fed crabs. Fed and starved winkles took up U at similar rates and excreted it at similar rates, so the sea water was also the major source of U to winkles. Crabs took up more U than winkles; the concentration factors were 7 to 18 and 4, respectively. Uranium turnover was quite slow for both species (11 to 36 d) as it was also for winkle shells (6 d); this suggests that the rate-limiting processes which control turnover are biological (e.g. growth or tissue replacement) or physical (e.g. diffusion into the shell) rather than chemical (e.g. precipitation, adsorption or exchange). There was no effect of increasing U concentration in water on the U kinetic parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00428128
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    Paper (German National Licenses)
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