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  • 2000-2004  (86)
  • 1990-1994  (73)
  • 1970-1974  (32)
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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
    Erratum: Two- and three-body forces in the interaction of He atoms with Xe overlayers adsorbed on (0001) graphite [J. Chem. Phys. 91, 6477 (1989)] (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 4492-4492 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459724
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Relaxation of radiation damage in silicon planar detectors (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 4072-4076 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The behavior of radiation-induced carbon-related defects in high-resistivity silicon detectors has been investigated. The defects were introduced by α-particle irradiation and investigated by deep-level transient spectroscopy. An unusual defect behavior consists in low-temperature annealing, including self-annealing at room temperature, of the interstitial carbon Ci with a simultaneous increase of the Ci-Oi-complex concentration. The kinetic parameters of the process have been determined from the increase of the Ci-center concentration versus time. Two annealing velocities have been observed, which arise from different heat treatments during the detector fabrication process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357356
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  • 5
    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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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Über das Verhalten von14C-markierten Diacctylweinsäuremono- und -diglyceriden in vitro und im Organismus der Ratte (1970)
    Springer
    European journal of nutrition 10 (1970), S. 111-114 
    Details
    ISSN: 1436-6215
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Medicine
    Description / Table of Contents: Summary 1. In aqueous phosphate buffer diacetyl tartaric acid monoglyceride is hydrolyzed to glyceride and tartaric acid. 2. Orally administered14C-labeled emulsifier to rats is absorbed to 26–31% of the activity given. 3. 21–20% are oxidized to14CO2, 8–13% are excreted in the urine, 2% are retained in the carcass.
    Notes: Zusammenfassung 1. Die vorliegende Substanz wird in geringem Umfang, maximal zu 10–20%, im wäßrigen Medium gespalten. 2. Im Organismus der Ratte wird rd. 1/3 der14C-Aktivität der Substanz resorbiert. 3. Die Ausscheidung der14C-Aktivität erfolgt zu 12–20% via Lunge, zu 8–13 % via Niere, während der im Körper verbleibende Anteil nur 2% ausmacht.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02021841
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  • 8
    Electronic Resource
    Electronic Resource
    Über substituierte 2-Amino-1-pyrroline, 3. Mitt.: rac.-3,3-Diphenylnoformicin und Derivate der 3,3-Diphenyl-2-aminopyrrolin-5-carbonsäure (1971)
    Springer
    Monatshefte für Chemie 102 (1971), S. 180-186 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract 5-Carboxyl-substituted 3.3-diphenyl-2-amino-1-pyrrolines are conveniently prepared by cycloaddition of α-acetaminoacrylic ester to diphenylacetonitrile. An alternative route, starting with the 4.4-diphenyl-4-cyano-2-bromobutyric acid derivatives1 b or1 d, results in poor yields owing to elimination of HBr during amination. Several amides of 3.3-diphenyl-2-aminopyrroline-5-carboxylic acid were prepared, including the β-carbamidinoethylamide (rac. diphenylnoformicin). Reduction of the ethyl ester2 f yields 3.3-diphenyl-2-amino-5-hydroxymethyl-1-pyrroline (3).
    Notes: Zusammenfassung 5-Carboxylsubstituierte 3,3-Diphenyl-2-amino-1-pyrroline werden vorteilhaft durch Cycloaddition von α-Acetaminoacrylester an Diphenylacetonitril hergestellt. Ein zweiter Syntheseweg, ausgehend von den 4,4-Diphenyl-4-cyan-2-brombuttersäurederivaten1 b oder1 d, verläuft wegen der HBr-Eliminierung während der Aminierung mit schlechten Ausbeuten. Es werden einige Amide der 3,3-Diphenyl-2-aminopyrrolin-5-carbonsäure (2 c), darunter das β-Carbamidinoäthylamid (rac. Diphenylnoformicin) (2 h) hergestellt. Die Reduktion des Äthylesters2 f führt zum 3,3-Diphenyl-2-amino-5-hydroxymethyl-1-pyrrolin (3).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00909227
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  • 9
    Electronic Resource
    Electronic Resource
    Acylderivate von 2-Amino-p-pyrrolinen (1971)
    Springer
    Monatshefte für Chemie 102 (1971), S. 627-634 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Acylierung von 2-Amino-3.3-diphenyl-5-methyl-1-pyrrolin (1) und 2-Amino-3.3-diphenyl-1-pyrrolin (2) erfolgt in den hier untersuchten Fällen am N-2-(exo)-Stickstoff. Die Umsetzung der cyclischen Amidine1 und2 mit BrCN gibt jedoch neben den N-2-(exo)-auch die N-1-(endo)-Cyanamidine. Diese werden in die entsprechenden Carbamoyl- und Thiocarbamoylamidine umgewandelt.
    Notes: Abstract Acylations of 2-amino-3.3-diphenyl-5-methyl-1-pyrroline (1) and 2-amino-3.3-diphenyl-1-pyrroline (2) occur at the N-2-(exo)-nitrogen. However, reaction of1 and2 with BrCN yields not only the N-2-(exo)-cyanoamidines but also the N-1-(endo)-isomers. Either is converted into the corresponding carbamoyl and thiocarbamoyl amidines.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00909361
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  • 10
    Electronic Resource
    Electronic Resource
    Semicyclische Carbamidinoamidine als potentielle Antidiabetica (1971)
    Springer
    Monatshefte für Chemie 102 (1971), S. 635-642 
    Details
    ISSN: 1434-4475
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Aus 2-Amino-1-pyrrolinen können durch bekannte Reaktionen stabile Carbamidinoderivate dargestellt werden. Die Addition von Bisbenzhydrylcarbodiimid an 2-Amino-1-pyrroline, gefolgt von saurer Abspaltung der Benzhydrylreste, stellt eine neue vorteilhafte Methode zur Herstellung der nor-Derivate dieser Verbindungsklasse (Tab. 2) vor. Einheitliche N2-Alkyl-und Arylsulfonylderivate dieser Reihe erhält man mit den 1-(N2-Sulfonylcarbamidino)-3.5-dimethylpyrazolen.
    Notes: Abstract Stable carbamidine derivatives of 2-amino-1-pyrrolines have been prepared using known reactions. The addition of bis-benzhydrylcarbodiimide to 2-amino-1-pyrrolines followed by acid cleavage of the benzhydryl moieties provides an improved method for the preparation of nor-derivatives of this class of compounds (Table 2). N2-Alkyl-and arylsulfonyl derivatives of this series have been selectively obtained from 1_(N2-sulfonylcarbamidino)-3.5-dimethylpyrazoles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00909362
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