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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5666-5668 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The hydrogenation-disproportionation-desorption-recombination (HDDR) process was applied to SmCo5 using extreme conditions, namely high hydrogen pressures and reactive milling under hydrogen. Investigations on the hydrogen absorption behavior of SmCo5 by differential scanning calorimetry under hydrogen pressures between 1 and 7 MPa showed absorption events due to an interstitial absorption at about 100 °C and a disproportionation reaction at about 600 °C. X-ray diffraction showed the disproportionation of SmCo5 into Sm hydride and fcc-Co. A favorable effect of high hydrogen pressures on the disproportionation reaction was observed which can be explained by a decrease of the free enthalpy of the samarium hydride for increasing hydrogen pressures. Reactively milled SmCo5 showed also the products of the disproportionation reaction. The recombination to the original SmCo5 phase on hydrogen desorption in a subsequent heat treatment in vacuum was successful for both methods. However, Sm2O3, Sm2Co17, and Sm2Co7 were detected as minor phases. Maximum coercivities μ0JHC of 2.1 and 4.7 T were achieved for high pressure and reactively milled HDDR powders, respectively. The high coercivities originate from the high anisotropy field of the SmCo5 phase in combination with the grain refinement due to the HDDR treatment. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5420-5422 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Polycrystalline bulk samples of the layered manganites La2−2xSr1+2xMn2O7 showing a colossal magnetoresistance (CMR) effect were prepared for doping levels of x=0.4 and 0.5 by a solid-state reaction route. Temperature and field dependences of magnetization and of electrical resistivity have been measured between 5 K and room temperature. Ferromagnetic behavior with a Curie temperature of TC=135 K and a high value of spontaneous magnetization (64 emu g−1) was found for x=0.4. The x=0.5 compound orders antiferromagnetically near TN=215 K, showing a resistivity enhancement there. The resistivity of the x=0.4 compound shows a field dependence at low temperatures similar to that found for polycrystalline La0.7Sr0.3MnO3. The resemblance includes the presence of both a low-field and a high-field contribution to the magnetoresistance, as well as the magnitude of the low-field MR (−23% at 20 K and −15% at 77 K for H=1 kOe). The low-field MR is attributed to the effect of grain boundaries. In contrast to the grain-boundary MR of La0.7Sr0.3MnO3, it was also observed at temperatures far above the TC of the layered manganite. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 6058-6060 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using high resolution neutron scattering on a powder sample of HoNi2 11B2C magnetoelastic effects are observed in this compound for the first time. At low temperatures the tetragonal lattice is distorted along the [110] direction, in which the long-range ordered Ho moments are aligned. The length of the unit cell in [110] direction is shortened by about 0.19% compared to its length in [1¯10] direction. This lattice distortion is considered to be related to the existence of the commensurate c-axis modulated antiferromagnetic structure. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 2218-2220 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A gradual change of the grain orientation with the substrate temperature (TS) during deposition has been observed for La0.7Sr0.3MnO3 films on Y-stabilized ZrO2(100) substrates. Epitaxial growth has been found around TS(approximate)800 °C. Both the low-field and the high-field magnetoresistance (MR) observed for the ferromagnetic state of these polycrystalline colossal MR manganite films were found to systematically depend on the degree of texture. The experimental results suggest a crucial role of a highly resistive region at the grain boundaries for this MR effect. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Bradford : Emerald
    Assembly automation 19 (1999), S. 47-54 
    ISSN: 0144-5154
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A method for the automatic selection of tools in a disassembly or assembly environment is described. The method uses a cluster graph to represent the product in a fashion suitable for the simple identification of part inter-relationships within the product. This graphical representation of the product is then converted directly into a dynamic programming model. To this dynamic programming model cost data are added and the optimum tool selection path is produced.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-2307
    Keywords: Key words Diffuse malignant pleural mesothelioma ; Vascular endothelial growth factor ; Factor VIII ; Microvessel count ; Histological differentiation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Angiogenesis is an important part of normal and pathological processes, including tumour growth, metastasis, inflammation and wound healing. VEGF is the best known angiogenic factor, implicated in tumour-associated microvascular hyperpermeability and carcinogenesis. We investigated 103 malignant pleural mesotheliomas, analysing the expression of vascular endothelial growth factor using immunohistochemistry and insitu hybridization. The grade of microvessel density was assessed with the aid of anti-factor-VIII antibodies. An increased expression of VEGF was found in biphasic and epithelioid mesotheliomas, correlating in a statistically significant manner (P〈0.042). Insitu hybridization confirmed the specificity of VEGF mRNA expression. There was a robust correlation between VEGF expression and increased microvessel density (P〈0.001), and positive mesotheliomas had significantly higher microvessel densities than negative specimens. There was also a significant correlation between microvessel density and histological pattern. As growth pattern tended towards biphasic and sarcomatoid mesotheliomas the density of micovessels decreased (P〈0.05).
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Der Pathologe 20 (1999), S. 169-176 
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Peritoneale Mesotheliome ; Wachstumsmuster ; Überlebenszeiten ; Asbestbelastung ; Asbestexpositionen ; Key words Peritoneal mesotheliomas ; Subtype ; Survival time ; Asbestos burden ; Asbestos exposure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary A total of 70 malignant and 4 benign peritoneal mesotheliomas were diagnosed by the German Mesothelioma Registry between 1992 and 1998. Malignant mesotheliomas developed mainly in men (55/70); only one man had a benign peritoneal alteration. Age at first diagnosis of malignant mesotheliomas is about 59 years; the women are on average 4 years younger than the men. Mean survival time ranges about 1 year; in 6 of 38 patients longer survival times of up to 7 years are known. The epitheloid subtype predominates, but no effect on survival time is noticed. The percentage of patients with combined asbestos-associated lung fibrosis is higher than that for pleural mesotheliomas; these patients become ill about 6.5 years earlier. The latency period is 36 years on average. For most patients asbestos exposure is related to their occupation mainly in metal industries, asbestos industries, and in the building trade. There is no evidence for an induction of benign peritoneal alterations by asbestos dust.
    Notes: Zusammenfassung Zwischen 1992 und 1998 wurden im Deutschen Mesotheliomregister 70 peritoneale maligne und 4 benigne Mesotheliome pathologisch-anatomisch diagnostiziert. Die malignen Mesotheliome sind überwiegend (55/70) bei Männern entwickelt, bei den benignen Veränderungen ist nur ein Mann betroffen. Das Erkrankungsalter der Patienten mit malignen Mesotheliomen liegt im Mittel bei 59 Jahren, Frauen sind zum Zeitpunkt der Diagnose 4 Jahre jünger als Männer. Die mittlere Überlebensrate beträgt ca. 1 Jahr, bei 6/38 Patienten sind längere Überlebenszeiten bis zu 7 Jahren bekannt. Der epitheloide Wachstumstyp überwiegt, ein Einfluß auf die Überlebenszeit ist nicht zu belegen. Es findet sich ein deutlich höherer Anteil mit Minimalasbestosen/Asbestosen als in Fällen mit Pleuramesotheliomen, diese Patienten erkranken etwa 6,5 Jahre eher. Für den überwiegenden Teil der Patienten ist eine erhöhte Exposition bekannt. Die meisten Patienten waren in der Metallindustrie, in der Asbestindustrie und im Baugewerbe tätig. Die Latenzzeit liegt im Mittel bei 36 Jahren. Die Induktion benigner peritonealer Veränderungen durch z.B. Asbeststaub ist wissenschaftlich nicht belegt.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Der Pathologe 20 (1999), S. 251-266 
    ISSN: 1432-1963
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zum Thema Die vorliegende Arbeit widmet sich der über hundertjährigen Geschichte der deutsch-lettischen Beziehungen im Fachgebiet der Pathologie. Es werden vier Zeitphasen dargestellt, gegliedert in die zaristisch-russische Herrschaft bis 1918, in den Nationalstaat Lettland 1918–1940 und 1941–1944, in die russische Okkupation 1944–1991 und endlich in die Neuzeit ab 1991.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Pathologiekurse ; Epidiaskop ; Dreidimensionale Darstellung ; Geräteumbau ; Keywords Lectures in pathology ; Epidiascope ; Threedimensional presentation ; Equipment modification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Additions and use of an epidiascope are described, which may be used after minor modifications for presenting wohle organs and organ slices in lectures on general and systemic pathology, saving the installation of sophisticated video equipment with additional lighting etc.
    Notes: Zusammenfassung Beschrieben werden Ergänzungen und Nutzung eines Epidiaskops, das nach geringfügigen Modifikationen für die Präsentation von Organ- bzw. Organscheiben in den Kursen der allgemeinen und speziellen Pathologie geeignet ist und aufwendige Videoinstallationen mit Zusatzbeleuchtung etc. erspart.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1432-1963
    Keywords: Schlüsselwörter Endemische Syphilis ; Paläopathologie ; Mittelalter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Paläopathologische Untersuchungen erlauben Rückschlüsse auf Erkrankungen früherer Populationen. Am Beispiel des westfälischen Ritters und Grafen Gottfried von Cappenberg werden die Möglichkeiten der Paläopathologie aufgezeigt. An knöchernen Skelettresten aus der Stiftskirche Cappenberg konnte insbesondere durch die histomorphometrische Methode nach Kerley eine genaue Lebensaltersbestimmung eines männlichen Skeletts erfolgen, die entscheidend unter Berücksichtigung zusätzlicher auch historischer Vorgaben zur Identifizierung (Rekognoszierung) der Knochen des Grafen Gottfried von Cappenberg (AD 1097–1127) führte. Die Unterschenkelknochen dieses frühadulten Mannes ließen zusätzlich pathologische Befunde erkennen, die insgesamt dem Krankheitsbild der endemischen Syphilis (d. h. einer nichtvenerischen Form der Syphilis) zuzuordnen waren. Die Paläopathologie ist somit in der Lage, neben wichtigen Fragestellungen wie z. B. der Identifizierung knöcherner Funde Krankheitsbilder zu erkennen, die auch noch heutzutage in der Differentialdiagnose knöcherner Läsionen – wenn auch nur selten – berücksichtigt werden sollten.
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