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  • Electronic Resource  (5)
  • 2005-2009
  • 1985-1989  (5)
  • 1989  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Synchrotron radiation lithography system in an atmospheric environment (invited) : INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 1643-1648 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The atmospheric environmental exposure system for synchrotron radiation (SR) lithography has been integrated using the Photon Factory storage ring (2.5 GeV). The system, composed of a highly reliable beamline, an SR extracting chamber and a prototype SR stepper, aims at attaining higher accuracy and throughput. Based on a fail-safe mechanism notion, a double-vacuum protection system, in which two sets of a fast closing valve and acoustic delay line are installed in the main beamline and branch beamline, respectively, has been organized. Vacuum breakdown tests indicated that any vacuum breakdown, a beryllium (Be) window rupture in the worst case, exerts little influence on the storage ring ultrahigh vacuum. The SR extracting chamber, equipped with a Be window and an extraction window, is filled with helium at atmospheric pressure. Particularly, the 50-μm-thick, 35-mm-diam Be window, vacuum-sealed by a Viton O-ring, was preliminarily employed and, so far, has operated successfully, giving a 25-mm square exposure area. In terms of practical availability and simplicity, the SR stepper in an atmospheric environment has been constructed. A novel differential mode linear Fresnel zone plate alignment method, which can detect an alignment error between a mask and a wafer during exposure, was developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141050
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic field dependence of spontaneous oscillation in n-InSb (1989)
    Springer
    Applied physics 48 (1989), S. 189-191 
    Details
    ISSN: 1432-0630
    Keywords: 72.20H ; 72.20M
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The magnetic field dependence of spontaneous oscillation in n-InSb is investigated. We have observed two types of variation in the oscillation with increasing magnetic field. One is an abrupt appearance of the oscillation between 0.56 T and 0.68 T. The other is the appearance of bifurcation in the oscillation period above 0.79 T. This can be explained by the change of the number of levels in the electron system, according to the generation-recombination model of Schöll for the self-generated chaos. The magnitude of the current at the onset of the oscillation decreases linearly with increasing magnetic field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01141283
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Balloon test occlusion of the internal carotid artery with monitoring of compressed spectral arrays (CSAs) of electroencephalogram (1989)
    Springer
    Acta neurochirurgica 101 (1989), S. 29-34 
    Details
    ISSN: 0942-0940
    Keywords: Balloon test occlusion ; internal carotid artery ; compressed spectral arrays (CSAs): electroencephalography (EEG) ; Matas test
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We used the compressed spectral arrays (CSAs) of the electroencephalogram (EEG) to monitor cerebral blood flow related events in balloon test occlusion of the internal carotid artery (balloon Matas test). Reliability of the CSAs was examined in 22 patients subjected to the test. Of 9 patients who underwent subsequent permanent carotid occlusion, in 6 there was no change on CSAs and/or in neurological conditions. In 2 patients, there was a slowing on CSAs prior to the appearance of neurological deterioration during clinical testing. CSAs transformed these EEG changes into a succinct graphic display. In 1 of the 2, for whom the Matas test was repeated 1 year later, there was a change from positive to negative and delayed cerebral infarction occurred after carotid occlusion. In the other patient, an ischaemic insult occurred during the balloon occlusive procedures. The third patient had a fatal delayed ischaemic complication 3 days after surgical ligation of the cervical carotid artery, despite the negative balloon Matas test. Complications in these 3 patients were presumably related to thromboembolic mechanisms. The balloon Matas test monitored by CSAs is useful for detecting change in brain functions attributed to an inadequate blood flow. However, this test is unreliable for predicting thrombo-embolic complications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410065
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Supratentorial astrocytic tumours of childhood: A clinicopathologic study of 41 cases (1989)
    Springer
    Acta neurochirurgica 101 (1989), S. 3-8 
    Details
    ISSN: 0942-0940
    Keywords: Children ; supratentorial astrocytoma ; treatment ; prognosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Forty-one patients with ages from 0 to 16 years harbouring Supratentorial astrocytic tumours were treated between 1964 and 1986. Twenty-four of them were located in the cerebral hemisphere or in the ventricle, and 17 were in the basal ganglia, thalamus, and/ or optico-hypothalamic region. There were nine glioblastomas multiforme, four anaplastic astrocytomas, 11 fibrillary astrocytomas, 12 pilocytic astrocytomas, two pleomorphic xanthoastrocytomas, two subependymal giant cell astrocytomas and one primitive astrocytic tumour. Low grade tumours tended to occur in young subjects near the midline, and high grade ones in older patients in the hemisphere. Initial treatment in most the patients was a resection or biopsy followed by radiation therapy. Eleven patients were retreated for their recurrent tumours with combinations of surgical removal of the tumour, radiotherapy, and/or chemotherapy. After a follow-up of 3 months to 17 years, 51% of the patients survived with a median survival of 7 years. Outcome of the patients with Supratentorial astrocytomas correlated mostly with the histological grade of malignancy of the tumour, and to a lesser degree with the tumour location. The biological behaviour and treatment of supratentorial astrocytomas in childhood are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01410061
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Surgical treatment for paediatric patients with moyamoya disease by indirect revascularization procedures (EDAS, EMS, EMAS) (1989)
    Springer
    Acta neurochirurgica 98 (1989), S. 135-140 
    Details
    ISSN: 0942-0940
    Keywords: Moyamoya disease ; paediatric case ; surgical treatment ; indirect non-anastomotic EC-IC bypass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Surgical results of paediatric patients with Moyamoya disease who were treated by indirect revascularization procedures are reported. Encephalo-duro-arterio-synangiosis (EDAS), encephalomyo-arterio-synangiosis (EMAS), and/or encephalo-myo-synangiosis (EMS) were performed on 47 sides of 29 children with Moyamoya disease. The results of those non-anastomotic EC-IC bypass procedures were evaluated clinically, angiographically, and by computed tomography (CT). Postoperative external carotid angiograms showed a good collateral formation through EDAS, EMAS, or EMS in about 70–80 percent of all surgically treated sides. The symptoms such as TIA, RIND, and/or involuntary movements disappeared in the cases with a good collateral formation but not in those with insufficient development of the collateral circulation. The indirect EC-IC bypass surgery seems effective for most of the children with Moyamoya disease who present with ischaemic signs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01407339
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    Paper (German National Licenses)
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