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  • Electronic Resource  (4)
  • 2005-2009  (3)
  • 1975-1979  (1)
  • 1950-1954
  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK; Malden, USA : Blackwell Science Ltd
    Journal of fish biology 66 (2005), S. 0 
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Survival and recovery rates were obtained for small-spotted catshark Scyliorhinus canicula in the Cantabrian Sea (north of Spain) based on tagging data. A total of 7656 specimens were tagged from 1993 to 2001. Recovery models for multiyear tagging studies were applied using the programme Mark. The best model fitted was achieved considering constant survival and recovery rates following the Brownie parameterization. The outputs were a survival rate (S) 0·89 and a recovery rate (f) 0·006. The reduced parameterization (S and r) provided very similar results, 0·89 and 0·06 respectively. The total finite mortality estimated was therefore Z = 0·11.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 348-349 (Sept. 2007), p. 69-72 
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper presents a crack analysis of linear magnetoelectroelastic materials subjected tostatic loading conditions. To this end, an efficient boundary element method (BEM) is developed.Unlike many previous investigations published in literature, two-dimensional (2-D) linearmagnetoelectroelastic materials possessing fully coupled piezoelectric, piezomagnetic andmagnetoelectric effects are considered in this paper. A combination of the displacement BEM andthe traction BEM is used in the present formulation. The displacement BEM is applied for theexternal boundary of the cracked solid, while the traction BEM is used for the crack-faces. Aregularization technique is implemented to compute the strongly singular and hypersingularboundary integrals in the BEM. The electric displacement intensity factor (EDIF), the magneticinduction intensity factor (MIIF), the stress intensity factors (SIF), the mechanical strain energyrelease rate (MSERR) and the total energy release rate (TERR) are evaluated directly from thecomputed nodal values at discontinuous quarter point elements placed next to the crack tip. Theaccuracy of the BEM is verified by analytical solutions known in literature. Results are presented fora branched crack in a bending specimen subjected to combined magnetic-electric-mechanicalloading conditions
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: We report here on the growth of epitaxial YMnO3 thin films on SrTiO3 single crystallinesubstrates. We show that depending of the choice of the substrate orientation or use of suitable(metallic) buffer layer, the epitaxial texture of the YMnO3 thin films as well as its crystallographicphase (orthorhombic or hexagonal) can be selected. Antiferromagnetic YMnO3 films have been alsogrown on ferromagnetic SrRuO3 epitaxial layers. Magnetic measurements show the existence of anexchange bias in orthorhombic films
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of neurology 219 (1978), S. 227-240 
    ISSN: 1432-1459
    Keywords: Chronic poststroke state ; Internal carotid artery occlusion ; Hyperbaric oxygenation ; Cerebral ischemia ; Extra-intracranial arterial anastomosis ; Cerebral metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wurden 35 Patienten im chronisch postapoplektischen Stadium untersucht. Diese zeigten einen Verschluß der A. carotis interna mit erheblichen neurologischen Ausfällen, die über eine durchschnittliche Dauer von 10 Wochen bereits bestanden. Zuerst wurde bei jedem Patienten eine hyperbare Sauerstoffbehandlung durchgeführt. Darauf wurde bei 21 dieser Patienten eine extra-intrakranielle Anastomosenoperation vorgenommen. Um den Verlauf der zerebralen Störungen zu erfassen, wurden neurologische Verlaufsuntersuchungen und EEG-Analysen durchgeführt. Entsprechend dem Effekt der hyperbaren Sauerstoffbehandlung und der nachfolgenden extra-intrakraniellen Anastomosenoperation wurden diese Patienten in 3 Gruppen eingeteilt. Gruppe I — 15 der 35 Patienten — zeigte bei Beendigung der hyperbaren Sauerstoffbehandlung eine deutliche Besserung der zerebralen Störungen und der elektrischen Hirnaktivität. Anschließend wurde bei jedem Patienten der Gruppe I eine extra-intrakranielle Anastomosenoperation durchgeführt. Dies erbrachte eine weitere Besserung der Hirnfunktionen und der elektrischen Hirnaktivität. Die postoperative Angiographie zeigte die Funktionsfähigkeit der Anastomose in 14 Fällen der Gruppe I. Gruppe II a besteht aus 14 Patienten, die am Ende der hyperbaren Sauerstoffbehandlung wie auch bei Langzeituntersuchungen nur geringe Änderungen der neurologischen Ausfälle und der elektrischen Hirnaktivität zeigten. Bei diesen Patienten der Gruppe IIa wurde keine extra-intrakranielle Anastomosenoperation durchgeführt. Gruppe IIb besteht aus 6 Patienten, die ebenso am Ende der hyperbaren Sauerstoffbehandlung nur geringe Befundänderungen zeigten. Jedoch wurde bei diesen 6 Patienten anschließend eine extraintrakranielle Anastomosenoperation vorgenommen. Obwohl die postoperative Angiographie bei jedem dieser 6 Fälle eine Funktionsfähigkeit der Anastomose zeigte, ließ sich bei der Langzeitbeobachtung nur eine geringe Befundänderung feststellen. Alle 35 Patienten boten ein sehr ähnliches klinisches Bild und befanden sich in einem chronischen postapoplektischen Stadium, wo eine spontane Besserung selten beobachtet wird. Keiner der Patienten bot vor Beginn der hyperbaren Sauerstoffbehandlung einen Anhalt für die Rückbildungsfähigkeit der zerebralen Störungen. Diese Untersuchungen zeigen, daß (a) die EEG-Intervall-Amplituden-Analyse wertvoll für die objektive Verlaufsuntersuchung bei Hirnläsionen ist, (b) die während der HO-Behandlung durchgeführte EEG-Analyse bei der Differenzierung zwischen reversiblen und irreversiblen ischämisch-hypoxischen Veränderungen des Hirns hilfreich sein kann, (c) der einseitige Verschluß der Arteria carotis interna zu neurologischen Ausfällen und vor allem aber zu bilateralen EEG-Veränderungen mit einer akzentuierten Reduktion der elektrischen Hirnaktivität über der ipsilateralen Hemisphäre führen kann, (d) chronischischämische cerebrale Störungen durch die hyperbare Sauerstoffbehandlung gebessert werden können und eine weitergehende Besserung durch nachfolgende extra-intrakranielle Anastomosenoperation erzielt werden kann und (e) Hirngewebe eine chronische Ischämie, die zu erheblichen neurologischen Ausfällen geführt hat, über eine durchschnittliche Dauer von 3 Monaten tolerieren kann.
    Notes: Summary Thirty-five chronic stroke patients, who had internal carotid occlusion that resulted in considerable neurological deficit persisting for an average of 10 weeks, were studied. First, hyperbaric oxygen (HO) therapy was administered to each patient. Subsequently an extra-intracranial anastomosis operation was performed on 21 of these patients. Serial neurological examinations and EEG analyses were performed to assess the clinical course of the cerebral lesion. According to the effect of HO treatment and of the subsequent extra-intracranial anastomosis operation these patients were divided into three groups. Group I—15 of the 35 patients—showed a significant improvement of cerebral function and electrical brain activity at the conclusion of HO therapy. Subsequently an extra-intracranial anastomosis operation was performed on each patient of group I. This resulted in further recovery of cerebral function and electrical brain activity. Postoperative angiography revealed patency of the anastomosis in 14 of the group I patients. Group IIa (14 patients) had only little change in the neurological deficit and electrical brain activity at the conclusion of HO therapy as well as at later examinations. Extra-intracranial anastomosis operation was not performed on the six patients in group IIb who also revealed only little change in their condition at the conclusion to HO treatment. Subsequent extra-intracranial anastomosis operation was, however, performed on these six patients. Although postoperative angiography demonstrated a patent anastomosis in each of these six cases only little change in their status was observed subsequently. The 35 patients were clinically very similar and were in a chronic poststroke stage where spontaneous recovery rarely occurs. None of them manifested any clinical evidence of reversibility of the cerebral alteration before beginning HO therapy. These findings indicate that (a) EEG interval-amplitude analysis is of value for an objective assessment of the course of the cerebral lesion, (b) EEG analyses performed during HO treatment can help to differentiate between reversible and irreversible ischemic hypoxic alterations of the brain, (c) unilateral internal carotid occlusion can lead to neurological deficits and, in particular to bilateral EEG alterations with an accentuated reduction of electrical brain activity over the ipsilateral hemisphere, (d) chronic ischemic alterations of the brain can be improved by HO therapy and additional recovery can take place after subsequent extra-intracranial anastomosis, and (e) brain tissue can tolerate chronic ischemia leading to considerable neurological deficit for an average period of 3 months.
    Type of Medium: Electronic Resource
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