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  • Articles: DFG German National Licenses  (16)
  • 1985-1989  (16)
  • 1
    Electronic Resource
    Electronic Resource
    Thermal stability of WSix/GaAs interface (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 220-224 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Secondary ion mass spectrometry (SIMS), Rutherford backscattering spectrometry (RBS), and measurements of forward current-voltage characteristics at various temperatures were used to study metallurgical reactions in WSix/GaAs formed by sputter deposition. Both SIMS and RBS showed that annealing at 800 °C results in migration of W and Si into GaAs when the atomic ratio x deviates from 0.5. On the other hand, the forward current-voltage characteristics of WSix/GaAs diodes at various temperatures showed that the excess current across the interface induced after annealing is large when x deviates substantially from 0.5, in agreement with the SIMS and RBS results. It is suggested that the migration of W and Si is directly involved in the thermal degradation of the structural and electrical properties of the WSix/GaAs interface and its x dependence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338860
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Zn-induced impurity levels in layer semiconductor InSe (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 3647-3650 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The impurity levels in Zn-doped InSe have been investigated by photoluminescence (PL), Hall effect (HE), and deep-level transient spectroscopy (DLTS). Previous analysis by PL spectra shows that the radiative transition is dominated by donor-Zn acceptor pairs. In the present work, a search was made for the deep acceptor level using the combined data from HE and DLTS measurements. We find that the deep acceptor level, which is associated with defects or defect complexes formed by Zn atoms in the interlayer, is located about 0.6 eV above the valence band.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344075
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The outcome of severe head injuries in children (1989)
    Springer
    Neurosurgical review 12 (1989), S. 436-440 
    Details
    ISSN: 1437-2320
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01790687
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Treatment of acute subdural hematoma with a low GCS score (1989)
    Springer
    Neurosurgical review 12 (1989), S. 198-200 
    Details
    ISSN: 1437-2320
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01790648
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Nuclear design for a heavy ion-beam fusion reactor, HIBLIC (1985)
    Springer
    Journal of fusion energy 4 (1985), S. 323-338 
    Details
    ISSN: 1572-9591
    Keywords: heavy ion beam ; HIBLIC ; target ; reactor chamber ; beam port ; Monte Carlo method ; activity ; tritium breeding ; energy multiplication ; radiation damage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A nuclear analysis was carried out for a heavy ion-beam fusion reactor, HIBLIC. The analysis includes the target and chamber neutronics, time-dependent radiation damage in the first wall, and radiation streaming through beam ports. It is found that the reactor chamber is characterized by its high tritium breeding ratio, low radiation damage in the second wall, and low induced activity. To reduce the radiation damage in the superconducting, focusing magnets, tapering the beam ports along the direct line-of-sight component of the source neutron is necessary in the magnet regions and also in the collimator region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01058358
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Neutronic optimization for a blanket of the laser fusion reactor, SENRI-I (1985)
    Springer
    Journal of fusion energy 4 (1985), S. 315-319 
    Details
    ISSN: 1572-9591
    Keywords: optimization ; SENRI ; blanket ; tritium ; breeding ; energy multiplication ; molten salt ; nonbreeding ; hybrid ; support ratio
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Neutronic calculations were performed to optimize the SENRI blanket in terms of energy multiplication as well as tritium breeding ratio. The blanket employs a thick (∼ 64-cm) Li layer as breeder/coolant. Three approaches were taken here to achieve the goal: (1) reduction of6Li in the lithium, (ii) replacement of the Li layer by a molten-salt (flibe) layer, and (iii) shipment of excess tritium to a nonbreeding blanket. It was found that the excess tritium produced in the SENRI blanket could be used effectively to obtain additional power by fueling a nonbreeding D-T reactor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01053361
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Massive traumatic haematoma of the corpus callosum (1986)
    Springer
    Acta neurochirurgica 81 (1986), S. 36-39 
    Details
    ISSN: 0942-0940
    Keywords: Severe head injury ; corpus callosum ; diffuse injury
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Five unusual cases with massive haematoma of the corpus callosum caused by blunt head trauma are presented. Aside from the callosal haematomas, intraventricular and subarachnoid haemorrhages or small haemorrhagic foci in the basal ganglia or thalamus were common concomitant lesions on the computerized tomographic (CT) scan. The sites of the impacts were the frontal and occipital areas which were close to the midline and above the level of the corpus callosum. Severe and diffuse brain dysfunction was suggested by the severity of the Glasgow coma score (GCS) and the abnormality on multimodality evoked potentials. An intensive medical treatment such as barbiturate could be promising since a direct surgical approach was dubious because of additional damage to the severely injured brain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01456262
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Axonal trajectories of posterior canal-activated secondary vestibular neurons and their coactivation of extraocular and neck flexor motoneurons in the cat (1988)
    Springer
    Experimental brain research 70 (1988), S. 181-191 
    Details
    ISSN: 1432-1106
    Keywords: Axonal branching ; Vestibulo-ocular ; Vestibulo-collic ; Neck motoneurons ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Unit activities of 148 secondary vestibular neurons related to the posterior semicircular canal were recorded extracellularly in anesthetized cats. Axonal projections of these neurons were examined by their antidromic responses to stimulation of the excitatory target motoneurons of the contralateral (c-) inferior rectus muscle (IR) and bilateral (bi-) motoneuron pools of longus capitis muscles, neck flexors, in the C1 segment (C1LC). The neurons were classified into 4 groups according to their axonal projections. The first group of neurons, termed vestibulo-oculo-collic (VOC) neurons, sent axon collaterals both to the c-IR motoneuron pool and to the c-C1LC motoneuron pool. The majority of them (72%) were located in the descending nucleus. The second group of neurons were termed vestibuloocular (VO) neurons and sent their axons to the c-IR motoneuron pool but not to the cervical cord. Most of them (86%) were located in the medial nucleus. The third group of neurons, termed vestibulo-collic (contralateral) (VCc) neurons, sent axons to the cC 1LC motoneuron pool via the contralateral ventral funiculus but not to the oculomotor nuclei. They were mostly (75%) found in the descending nucleus. The last group of neurons were vestibulo-collic (ipsilateral) (VCi) neurons, which gave off axons to the ipsilateral (i-) C1LC motoneuron pool via the ipsilateral ventral funiculus but not to the oculomotor nuclei. One of them also sent an axon collateral to the c-C1LC motoneuron pool. The majority of them (74%) were located in the ventral part of the lateral nucleus. It was also observed in some of the VOC and VCi neurons that they produced unitary EPSPs in the c-C1LC and i-C1LC motoneurons, respectively. Their synaptic sites were estimated to be on the cell somata and/or proximal dendrites of the motoneurons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00271859
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Histological signs of immune reactions against allogeneic solid fetal neural grafts in the mouse cerebellum depend on the MHC locus (1988)
    Springer
    Experimental brain research 73 (1988), S. 15-22 
    Details
    ISSN: 1432-1106
    Keywords: Neural transplantation ; Major histocompatibility complex ; Allograft ; Rejection ; T cell subset
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Using an immunocytochemical method, we examined the immunological responses of adult mice to intracerebellar syngeneic and allogeneic fetal mouse brainstem transplants (embryonic days 12–14). Syngeneic grafts and major histocompatibility complex (MHC)-compatible and non-MHC-incompatible allogeneic grafts survived well, showing no histological signs of rejection even 6 months after transplantation, and with no expression of MHC antigens being observed in any of the grafts. However, most cases of both MHC- and non-MHC-incompatible allografts showed rejection responses, such as marked neovascularization, cellular infiltration and necrosis, two weeks to one month after transplantation. In animals showing rejection, Class I MHC antigens were found on grafted neuronal tissue. An increased number of reactive astrocytes was also observed in the grafts. High levels of Class I antigen expression and prominent gliosis correlated with vigorous cellular infiltration. A quantitative analysis of T cell subsets in the animals showing rejection revealed that the L3T4/Lyt-2 ratio was 1.02±0.21 (mean ± S.D.), indicating that helper/inducer and cytotoxic/suppressor T cells appeared equally in the rejection of MHC- and non-MHC-incompatible allografts. We consider that in these experiments, the brain was not completely an immunologically privileged site, and that MHC- and non-MHC-incompatible intraparenchymal neural transplants were not shielded from host immune surveillance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00279656
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Effect of diltiazem on the pharmacokinetics of propranolol, metoprolol and atenolol (1989)
    Springer
    European journal of clinical pharmacology 36 (1989), S. 67-70 
    Details
    ISSN: 1432-1041
    Keywords: diltiazem ; propranolol ; metoprolol ; atenolol ; pharmacokinetics ; drug interaction ; beta-adrenoceptor blockade ; healthy volunteers ; pharmacodynamic effect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetic interaction between diltiazem and three β-adrenoceptor blockers propranolol, metoprolol and atenolol was investigated in healthy volunteers given diltiazem 30 mg or placebo t.d.s. for 3 days, followed by a single dose of propranolol 20 mg, metoprolol 40 mg or atenolol 50 mg. The AUCs of propranolol and metoprolol were significantly increased after diltiazem and it significantly prolonged the elimination half-life of metoprolol. In contrast, it did not significantly affect the pharmacokinetics of atenolol. Propranolol significantly decreased the resting pulse rate after diltiazem pretreatment as compared to placebo. The results indicate that diltiazem impaired the clearance of propranolol and metoprolol, which are principally metabolized by an oxidative pathway, and that the kinetic interaction between diltiazem and propranolol may partly be related to the significant reduction in the pulse rate produced by the latter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00561026
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    Paper (German National Licenses)
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