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  • 1990-1994  (5)
  • 1985-1989  (3)
  • 1993  (5)
  • 1986  (3)
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  • 1990-1994  (5)
  • 1985-1989  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    On the effect of processing parameters in the chemical-vapor deposition of YBa2Cu3O7−δ thin films on polycrystalline silver (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 7563-7570 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results are reported from an investigation of the effects of selected processing parameters on the morphology and properties of YBa2Cu3O7−δ (YBCO) superconducting thin films grown directly on polycrystalline silver substrates by chemical-vapor deposition (CVD). These results were achieved through a set of experimental studies which examined: (i) recrystallization mechanisms of polycrystalline silver and their effect on the deposition of YBCO thin films; and (ii) CVD processing conditions leading to the growth of high-quality YBCO films. The samples were analyzed using dynamic impedance, four-point resistivity probe, x-ray diffraction, Rutherford backscattering, and scanning electron microscopy. These studies showed that substrate temperature played a critical role not only in the formation of YBCO films, but also in the recrystallization of silver substrates, which in turn greatly influenced film growth. The studies also led to the identification of a two-stage processing scheme for the growth of YBCO films on silver. The first processing stage consisted of a substrate conditioning cycle which involved a 10 min ramping from room temperature to deposition temperature where the substrates were held for an additional 10 min in a flow of 70 sccm O2 at a reactor working pressure of 2 Torr. The second processing stage involved actual film deposition at 760–800 °C for 3–10 min (depending on desired film thickness) in a mixed flow of 70 sccm O2 and 210 sccm N2O at a reactor working pressure of 4 Torr. Samples thus produced were highly oriented along the c axis perpendicular to the substrate with a zero resistance transition temperature of 87 K and a critical current density of 2×104 A/cm2 (77 K, B=0). The films had a thickness of 200–700 nm depending on the length of the growth cycle, which corresponded to the growth rates in the range 65–130 nm/min. A growth mechanism for YBCO on polycrystalline silver, which emphasized the role of silver recrystallization, was consequently proposed and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354007
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  • 2
    Electronic Resource
    Electronic Resource
    Structural transitions and thermally averaged infrared spectra of small methanol clusters (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 9428-9437 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Classical Monte Carlo and molecular dynamics (MD) simulations were carried out to investigate the structures, the infrared spectra, and the rigid–nonrigid transitions of small methanol clusters (CH3OH)n for n=3–6. The study was motivated by experimental results for these clusters from size specific infrared (IR) dissociation spectroscopy. The MD simulations revealed the following transitions: The trimer passes from a rigid ring configuration into a series of nonrigid open chain structures starting at 197 K. For n=4 and 5 such transitions occur between rings and rapidly fluctuating ring structures at T=357 and 243 K, respectively. For n=6 first a pure isomeric transition between the two energetically lowest isomers of S6 and C2 symmetry is found at 35 K, and then a similar transition to a nonrigid behavior as is observed for n=4 and 5 is seen at 197 K. The measured spectra display in all cases the rigid lowest energy configurations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465477
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Spiral growth in epitaxial YBa2Cu3O7−x thin films produced by high deposition rate chemical vapor deposition (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 485-486 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A technologically useful chemical vapor deposition process with high growth rate ((approximately-greater-than)4 μm/h) was developed for the epitaxial growth of YBa2Cu3O7−x (YBCO) thin films. Even at the high growth rate used in this process, a spiral growth mechanism was observed and the films grown had electrical (Tc=92 K, Jc of 2×106A/cm2 at 77 K) and structural properties equal to films produced by physical vapor deposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.108914
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  • 4
    Electronic Resource
    Electronic Resource
    Structure and photodissociation spectra of mixed ethene–acetone clusters (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 9425-9431 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Infrared photodissociation spectra of the mixed complexes C2H4–CH3COCH3 and C2H4–(CH3COCH3)2 have been observed after size selecting them by scattering from a helium beam combined with mass spectrometric detection. The excitation of the ν7-out of plane symmetric wagging mode of ethene near its gas phase frequency at 949.3 cm−1 with a cw-CO2 laser leads to a characteristic depletion of the cluster beam. The dissociation spectrum of the 1:1 complex can be explained by two peaks at 950.8 and 961.6 cm−1. Calculations of minimum energy configurations and band shifts based on an empirical site–site potential show that these frequencies can be attributed to the absorption of two different isomers. They correspond to the two different binding patterns of the H atoms of ethene to the O atom of acetone and those of acetone to the C–C group of ethene, respectively. For the 1:2 complex, a large peak at 958.5 cm−1 and a smaller one around 940.5 cm−1 are found which can be explained in a similar manner by several isomers found in the structure calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464374
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Low antithrombin III in neonatal shock: DIC or non-specific protein depletion? (1986)
    Springer
    European journal of pediatrics 145 (1986), S. 500-503 
    Details
    ISSN: 1432-1076
    Keywords: Antithrombin III ; Albumin ; Shock
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Low antithrombin III (AT III) levels in shock are usually ascribed to disseminated intravascular coagulation (DIC). However, decreased activities of clotting factors and their inhibitors could reflect a generalised fall in plasma proteins rather than DIC. AT III and albumin were compared in 48 asphyxiated and non-asphyxiated newborn rabbits (pH6.70–7.30). Both AT III and albumin were markedly decreased in the sickest animals and there was a direct linear relationship between the two proteins (P〈0.001). Similar results were obtained in ten newborn infants suffering from shock and haemorrhagic diathesis. In all cases AT III and albumin were decreased below the normal range and significantly correlated (P〈0.01). Our findings suggest that AT III is not a useful diagnostic marker of DIC. Further, a similar fall of clottable and non-clottable proteins in shock questions the general assumption that the ensuing coagulopathy is due to intravascular coagulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02429051
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  • 6
    Electronic Resource
    Electronic Resource
    Clinical and pharmacokinetic studies on enoxacin in ear, nose and throat infections (1986)
    Springer
    Infection 14 (1986), S. S211 
    Details
    ISSN: 1439-0973
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei 65 Patienten, die wegen Infektionen im Hals-Nasen-Ohren-Bereich mit 400 oder 600 mg Enoxacin zweimal täglich behandelt wurden, wurde die Wirksamkeit und Verträglichkeit von Enoxacin geprüft. Bei 32 der 60 auswertbaren Patienten war das klinische Gesamtergebnis nach Enoxacin-Behandlung ausgezeichnet, bei 17 Patienten gut, bei sechs mäßig und bei fünf schlecht. Drei Patientinnen klagten über Magendruck, ein Patient über leichte Übelkeit. Bei zwei Patienten traten allergische Hautreaktionen und bei einem Patienten Gelenk- und Muskelschmerzen auf. Die pharmakokinetischen Untersuchungen ergaben hohe Enoxacin-Konzentrationen in den untersuchten Sekreten, in Eiter und Geweben, insbesondere aus Mittelohr und Nasennebenhöhlen.
    Notes: Summary The efficacy and tolerance of enoxacin were tested in 65 patients treated for ear, nose and throat infections with doses of 400 or 600 mg b.i.d. The overall clinical efficacy of enoxacin was excellent in 32, good in 17, fair in six, and poor in five out of 60 evaluable patients. Three female patients complained of stomach pressure and one man of slight nausea, two of allergic skin reactions and one of arthromyalgia. The pharmacokinetic studies showed high enoxacin concentrations in the secretions, pus, and tissues studied, especially in those of the middle ear and the sinuses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01667846
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  • 7
    Electronic Resource
    Electronic Resource
    Numerical evolution, linear and nonlinear, of spherically symmetric deviations from an isotropic universe (1993)
    Springer
    General relativity and gravitation 25 (1993), S. 373-397 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We describe an algorithm for solving 1 + 1-systems that are in symmetric hyperbolic form. It is applied to spherically symmetric deviations from ak = 0, radiation filled Isotropic universe. We compare the solution to the full Einstein equations with those of the linearized equations. For small enough initial data the evolutions are indistinguishable. However, for large data, i.e., for initial density contrasts in the 1 percent range, trapped surfaces appear and singularities form.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00757119
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  • 8
    Electronic Resource
    Electronic Resource
    Mg2IrB2-x, ein Magnesium-Iridiumborid mit W2CoB2 -verwandter Struktur (1986)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 543 (1986), S. 89-96 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mg2IrB2-x, a Magnesium Iridium Boride with a Structure Related to the W2CoB2-TypeThe new compound Mg2IrB2-x with a small homogeneity range determined approximately as 0,2 ≤ x ≤ 0,35 crystallizes monoclinically in the space group C2/m, Z=4 (lattice constants see Inhaltsübersicht). The structure which was solved by single crystal X-ray and powder neutron diffraction methods is related to the W2CoB2-type and contains distorted Mg4Ir2-prisms. The boron atoms are partly disordered. They are situated either inside the prisms forming pairs or with very short Ir-B distances (199 pm) on an elongated prism edge formed by two iridium atoms.
    Notes: Die neue Verbindung Mg2IrB2-x mit einem schmalen Homogenitätsbereich, der näherungsweise zu 0,2 ≤ x ≤ 0,35 bestimmt wurde, kristallisiert monoklin in der Raumgruppe C2/m, Z = 4. Bei x = 0,35 betragen die Gitterkonstanten a = 858,0(1) pm, b = 484,6(1) pm, c = 683,6(1) pm, β = 115°43′(1). Die Struktur, die mit Röntgen-Einkristall- und Pulver-Neutronenbeugungsmethoden bestimmt wurde, leitet sich vom W2CoB2-Typ ab und enthält verzerrte Mg4Ir2-Prismen. Die Boratome sind zum Teil fehlgeordnet. Sie befinden sich entweder innerhalb der Prismen und bilden Paare, oder sie liegen auf einer aufgeweiteten, aus zwei Iridiumatomen bestehenden Prismenkante, wobei sehr kurze Ir-B-Abstände ausgebildet werden (199pm).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19865431211
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