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  • 1
    Electronic Resource
    Electronic Resource
    Bingley : Emerald
    Kybernetes 31 (2002), S. 884-895 
    ISSN: 0368-492X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: We show that Padé approximants considerably improve convergence of Adomian's decomposition. The power of the method proposed is demonstrated through two illustrative examples from the field of nonlinear optics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Bingley : Emerald
    Kybernetes 32 (2003), S. 1369-1386 
    ISSN: 0368-492X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: In this paper, our aim is to determine the fundamental eigenfunction of a two nonlinear differential complex equation, which arises in microchip laser theory, using Adomian decompositon method.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 49 (2000), S. 0 
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Oilseed rape mosaic (ORMV) and tobacco mild green mosaic (TMGMV) tobamoviruses interfered with each other when infecting the same host, and interference was host-dependent. In tobacco cross-protection was obtained in two ways: the protecting virus prevented the accumulation of the challenging virus, even in the inoculated leaf; in Arabidopsis, protection was obtained only when the protecting virus was TMGMV. The protecting mechanism in Arabidopsis appeared to differ from that operating in tobacco. Although ORMV could be detected in the inoculated leaf, TMGMV prevented systemic infection by ORMV. Thus the host appears to play an important role in this type of cross-protection.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 88 (2000), S. 2081-2091 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Schottky barrier photovoltaic detectors have been fabricated on n-AlxGa1−xN(0≤x≤0.35) and p-GaN epitaxial layers grown on sapphire. Their characteristics have been analyzed and modeled, in order to determine the physical mechanisms that limit their performance. The influence of material properties on device parameters is discussed. Our analysis considers front and back illumination and distinguishes between devices fabricated on ideal high-quality material and state-of-the-art heteroepitaxial AlxGa1−xN. In the former case, low doping levels are advisable to achieve high responsivity and a sharp spectral cutoff. The epitaxial layer should be thin (〈0.5 μm) to optimize the ultraviolet/visible contrast. In present devices fabricated on heteroepitaxial AlxGa1−xN, the responsivity is limited by the diffusion length. In this case, thick AlxGa1−xN layers are advisable, because the reduction in the dislocation density results in lower leakage currents, larger diffusion length, and higher responsivity. In order to improve bandwidth and responsivity, and to achieve good ohmic contacts, a moderate n-type doping level (∼1018 cm−3) is recommended. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    facet.materialart.
    Unknown
    Madrid : Periodicals Archive Online (PAO)
    Hispania. 39 (1979) 141:51 
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  • 6
    ISSN: 1662-9752
    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
    Type of Medium: Electronic Resource
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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical microbiology & infectious diseases 19 (2000), S. 301-304 
    ISSN: 1435-4373
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  This study was designed to determine the prevalence of healthy Haemophilus influenzae carriers in a random sample of the preschool population in Catalonia. Oropharyngeal swabs were collected and cultured on chocolate agar supplemented with 260 μg/ml of bacitracin. Four hundred two of the 734 (54.8%) children studied were detected as Haemophilus influenzae carriers: 7 (0.9%) carried serotype b, 14 (1.9%) serotype e, 6 (0.8%) serotype f, and 375 (51%) carried nontypable strains. The results show that, although the prevalence of Haemophilus influenzae carriers is similar to figures reported from other countries, the prevalence of Haemophilus influenzae serotype b carriers is lower and corresponds with the low incidence of invasive disease observed in the Catalan community.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We report a systematic study of the low-temperature electrical resistivity of epitaxial nanometric SrRuO3 and LaNiO3 thin films. Weak localization effects were taken into account in order to explain the presence of minima in the $\rho $ -T curves. This description can be rationalized by the fact that, at the given growth conditions, the mean free path was comparable to the Fermi wavelength of the carriers, so that effects arising from quantum interference of the electronic wavefunctions were expected. The results reported here are of special interest to understand the relevance of weak localization effects in oxides.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-0630
    Keywords: PACS: 81.15.Fg; 73.61.-r
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. LaNiO3 thin films have been deposited by pulsed laser deposition on SrTiO3(100) and LaAlO3(100) substrates. The processing conditions have been investigated in order to optimize electrical resistivity, crystal quality, and surface morphology. Excellent properties are achieved at moderate substrate temperature and relatively low oxygen pressure, without the need for annealing. Thickness exerts an important influence on electrical transport, as the electrical resistivity increases quickly in films thicker than a few tens of nanometer. The surface of the films on LaAlO3 is very flat in all the studied thickness range, but the films on SrTiO3 develop a pattern of boundaries and even cracks as the thickness is higher. Below the critical thickness, high-quality epitaxial films with very smooth surface and low electrical resistivity are obtained under the optimum conditions of substrate temperature and oxygen pressure. The optimum processing conditions are different depending on the substrate, and control is especially critical in films deposited on SrTiO3.
    Type of Medium: Electronic Resource
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