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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 25 (1960), S. 1835-1835 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of organic chemistry 26 (1961), S. 784-787 
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 73 (1990), S. 205-211 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents The development of integrated microwave circuits for analogue and digital applications with higher speeds requires new testing methods. The process and circuit development primarily require non loding measurements of internal signals. The adaptation of the proven technique of e-beam testing to these new requirements was successfull. Signal rise times as well as phase relations between different signals are critical quantities in the time scale. Presently, rise times can be measured down to 15 ps with an error of less than 10%. Measurements between signals being recorded within 3 hours are possible with an accuracy of±2 ps.
    Notes: Übersicht Die Entwicklung integrierter Mikrowellenschaltungen für analoge und digitale Anwendungen mit hohen Geschwindigkeiten erfordert neue Meßmethoden. Für die Prozeß- und Schaltungsentwicklung ist vor allem die belastungsfreie Messung interner Signale notwendig. Die bereits bewährte Elektronenstrahlmeßtechnik konnte diesen neuen Anforderungen angepaßt werden. Zeitkritische Größen sind sowohl Signalanstiegszeiten als auch Phasenlagen verschiedener Signale zueinander. Signalanstiegszeiten können gegenwärtig bis herab zu 15 ps mit einem Fehler unter 10% gemessen werden. Für Messungen von Phasenlagen zwischen Signalen, die innerhalb von 3 Stunden aufgezeichnet wurden, ergibt sich eine Genauigkeit von±2 ps.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Acta neurochirurgica 116 (1992), S. 137-146 
    ISSN: 0942-0940
    Keywords: Posterior third ventricle tumours ; pineal tumours ; management ; operative indication ; technique ; chemotherapy ; results
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The evaluation of tumours located in the posterior part of the third ventricle or pineal region is achieved best by magnet resonance imaging (MRI). It shows the exact localization and extent, the involvement of neighbouring structures like thalamus or quadrigeminal plate and the displacement of the large veins, the internal cerebral veins, the vein of Galen and the veins of Rosenthal. If only CT is available, angiography shoud be performed prior to operation to identify the course of the veins. In children with a pineal region tumour the “tumour markers” AFP and β-HCG should be determined before operation. We approach the rare tumours entirely located within the posterior part of the third ventricle by the posterior interhemispheric transcallosal route with the patient in prone position with the head elevated. The same approach is used for pineal region tumours extending above the internal cerebral veins. Tumours arising from the posterior thalamus extending into the thalamus and ventricle as well, are better approached by the posterior transcortical transventricular route since the lateral view is rather limited by the midline approach. The most frequent tumours in the pineal region are approached if they are located below the internal veins by the infratentorial, supracerebellar route in the sitting position. A total of 60 cases are evaluted. If AFP and/or β-HCG are positive a highly malignant nongerminomatous germ-cell tumour must be suspected. We recommend initial chemotherapy with a combination of Vinblastine, Ifosfamide and Cis-platin without biopsy to avoid tumour seeding. After the “markers” are normalized operative removal of the residual tumour and radiotherapy should be carried out. In a series of 13 children operated on for pineal region tumours a rigid neuropsychological and endocrine evaluation was perfomed with encouraging results. During the last 10 years we have performed 49 open operations and 11 stereotactic biopsies. 40% of the patients were children under the age of 18. 40% of the tumours in childhood and 60% in adults were benign. In childhood 24% were germinomas and 20% non-germinomatous germ cell tumours. The indications for stereotactic biopsy and for open operation after biobsy are discussed.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 0942-0940
    Keywords: Subarachnoid haemorrhage ; ruptured cerebral aneurysms ; cerebral vasospasm ; nimodipine ; timing of surgery ; treatment mortality ; morbidity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In 1984, in connection with the introduction of the calcium antagonist nimodipine, a new strategy for the treatment of subarachnoid haemorrhage (SAH) due to ruptured aneurysm was developed in our hospital. With no rigid regard to “timing” all patients undergo surgery as soon as possible. The only exception being those in Hunt and Hess grades IV and V without space-occupying intracranial haemorrhage and those bearing aneurysms of the vertebrobasilar circulation that are difficult of access. As soon as the risk of rebleeding has been eliminated surgically an active therapy against the possible consequences of SAH—cerebral vasospasm and simultaneous disturbances of autoregulation—is started. It consists in lowering the increased intracranial pressure, raising of mean arterial pressure and improving of rheological properties of the blood in order to prevent delayed build-up of neurological deficit due to ischaemia. It goes without saying that calcium antagonists are given from the very beginning of the patient's treatment even before operation. The advantages of this therapeutic concept are demonstrated by two series of non-selected consecutive patient material. The first series (A; n=135) was treated between 1981 and 1984 before the change in treatment strategy, the second (B; n=183) from 1984 to 1986 after that change. The overall mortality in series A was 27%, that in series B 20%. Operative mortality could be reduced from 22% to 16% in patients having undergone early operation and from 6% to 2% in patients with late surgery. Development of permanent neurological deficits following early surgical intervention was seen in 4 out of 29 grade I–III patients (14%) in series A and in 5 out of 94 of such patients (5%) in series B.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 235-240 (1994), S. 3269-3270 
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 185-189 (1991), S. 2597-2598 
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physica B+C 126 (1984), S. 479-480 
    ISSN: 0378-4363
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physica B: Physics of Condensed Matter 194-196 (1994), S. 137-138 
    ISSN: 0921-4526
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 185-189 (1991), S. 1939-1940 
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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