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  • 1
    Electronic Resource
    Electronic Resource
    Mechanical alloying process of Cu-Zn system studied by 63Cu nuclear magnetic resonance (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 1783-1788 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The process of mechanical alloying (MA) and the phase transformations that accompany ball milling the elemental Cu and Zn powder mixtures have been investigated by 63Cu nuclear magnetic resonance spectrometry and x-ray diffractometry. The 63Cu Knight shifts in mechanically alloyed clusters of α, β, γ, or ε phases show significantly different from that of heavily deformed pure copper, indicating a reduction of s-like electron density. The wave functions around the Cu atoms are likely to assume a greater "p'' character when Zn is added. The formation and development of alloyed clusters are caused by the strong bonding interactions between Cu and Zn when the mixtures are ball milled. Under present conditions the alloying reaction is accomplished after milling about 15 h for Cu-39 at. % Zn, and it is faster when the Zn content is smaller. No amorphous phase was detected in the Cu-Zn system. The local atom rearrangement in the alloyed clusters is facilitated by the onset of the internal stress induced by MA. This might prevent the retaining of amorphous phase even if partial amorphization may occur during the MA process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356370
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  • 2
    Electronic Resource
    Electronic Resource
    Phase transition of C60 crystal in high temperature regime (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 476-477 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The internal friction of the polycrystalline C60 films was measured in the temperature range of 320–620 K. Around 426 K, a λ-shaped internal friction peak was detected. The peak was interpreted in terms of another phase transition above the order-disorder phase transition temperature. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121905
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  • 3
    Electronic Resource
    Electronic Resource
    The dielectric properties of polycrystalline C60 (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 3446-3448 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The dielectric properties (1–50 kHz) of polycrystalline C60 have been carefully studied from 70 to 300 K. Below 170 K, the ac conductance σ(T) is proportional to the temperature, which is thought to be due to the phonon-assisted jump of electrons between localized states around the Fermi level. A significant change of the slope of the capacitance versus temperature curve occurs at 85 K, which can be attributed to the glass transition. It is confirmed that electric dipoles may be induced by orientational defects in C60 crystal. The capacitance drop around 256 K is found to originate from the disappearance of the orientational defects above the order–disorder phase-transition temperature. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121661
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  • 4
    Electronic Resource
    Electronic Resource
    Calculation of cutoff frequency of arbitrary weak guidance optical waveguides by extended boundary condition method (2000)
    Springer
    Optical and quantum electronics 32 (2000), S. 31-42 
    Details
    ISSN: 1572-817X
    Keywords: elliptical optical waveguides ; extended boundary condition method ; mode cutoff ; moment method ; optical waveguide theory ; rectangular optical waveguides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The extended boundary condition method is applied to both circular and elliptical regions for calculating cutoff frequencies Vc of weakly guiding optical waveguides, which consist of a uniform cladding and a core with arbitrary shape and index profile. The frequency shift formula method is explained by means of the extended boundary condition method on circular regions. Comparing the method with analytic and other rigorous methods, we show that it is indeed a powerful tool. Numerical results confirm that the mode designation and arrangement order in elliptical and rectangular waveguides are, in general, dependent on the aspect ratio.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007038410215
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  • 5
    Electronic Resource
    Electronic Resource
    In situ FTIR study on the active oxygen species for the conversion of methane to methanol (1995)
    Springer
    Catalysis letters 35 (1995), S. 259-263 
    Details
    ISSN: 1572-879X
    Keywords: FT-IR ; oxygen species ; methane ; methanol ; iron aluminum phosphate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In situ FTIR studies showed the generation of a peroxide species by the contact of a H2-O2 gas mixture or of N2O with Fe-Al-P-O catalysts at ⩾573 K. This oxygen species oxidized methane into methanol at ⩾473 K, through the formation of methoxide species on the catalysts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807181
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  • 6
    Electronic Resource
    Electronic Resource
    Partial oxidation of methane with N2O over Fe2(MoO4)3 catalyst (1994)
    Springer
    Catalysis letters 24 (1994), S. 85-94 
    Details
    ISSN: 1572-879X
    Keywords: Methane ; partial oxidation ; nitrous oxide ; iron molybdate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The product distributions for partial oxidation of methane on Fe2(MoO4)3 catalyst were changed remarkably when the oxidant was switched from oxygen to nitrous oxide. When oxygen was used as the oxidant, the main products were HCHO and CO. However, when nitrous oxide was used, the formation of HCHO was greatly suppressed and C2 hydrocarbons (C2H6 and C2H4) were newly produced. The difference in kinetic behaviors between the two reactions using nitrous oxide and oxygen as the oxidant can be explained in terms of the competitive conversions of methyl intermediate into HCHO and C2H6. In the case of nitrous oxide as the oxidant, the adsorbed methyl intermediate would be transformed predominantly into C2H6 due to a low steady-state concentration of the active oxygen species on Fe2(MoO4)3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807378
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  • 7
    Electronic Resource
    Electronic Resource
    Remarkable enhancing effect of carbon dioxide on the conversion of methane to C2 hydrocarbons using praseodymium oxide (1998)
    Springer
    Catalysis letters 56 (1998), S. 203-206 
    Details
    ISSN: 1572-879X
    Keywords: methane ; carbon dioxide ; oxygen vacancies ; praseodymium oxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The presence of carbon dioxide remarkably enhanced the conversion of methane to ethane over praseodymium oxide in the absence of gaseous oxygen at 500–650°C. CO was simultaneously formed from CO2 accompanying the conversion of methane. The oxygen vacancies in praseodymium oxide were suggested to play key roles in this low-temperature reaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019073415980
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  • 8
    Electronic Resource
    Electronic Resource
    Internal Friction around T〈sub〉c〈/sub〉 Connected with Superconductivity in High T〈sub〉c〈/sub〉 Superconductors (1993)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 119-121 (Jan. 1993), p. 659-666 
    Details
    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
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/59/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.119-121.659.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Zero-point fluctuation and noise phenomena in Josephson junctions (1986)
    Springer
    Journal of low temperature physics 62 (1986), S. 111-117 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is suggested that the noise rise in Josephson parametric amplifiers can be interpreted as being the result of the zero-point fluctuation arising from the uncertainty principle. The fluctuation of the phase is calculated and related to the bandwidth of the plasmons of the superconducting pair. Thus an explanation is given not only of the origin of the noise, but also of the main experimental characteristics of the noise phenomena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00681322
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  • 10
    Electronic Resource
    Electronic Resource
    Scalar analysis of arbitrarily shaped optical waveguides by full guided mode expansion method and optimized sine method (1993)
    Springer
    International journal of infrared and millimeter waves 14 (1993), S. 2543-2554 
    Details
    ISSN: 1572-9559
    Keywords: Scalar analysis ; Optical waveguides ; Dispersion characteristics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper shows that the full guided mode expansion method and the optimized sine method, with a rather “rigorous” procedure of determing the dimensions of reference waveguides, provide simple, fast and accurate way for the scalar analysis of arbitrarily shaped optical waveguides. Use of a smaller matrix results in good agreement with previous works.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02086221
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