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  • 2010-2014  (183)
  • 2000-2004  (80)
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  • 1
    Electronic Resource
    Electronic Resource
    Structural study of refractory-metal-free C40 TiSi2 and its transformation to C54 TiSi2 (2002)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 80 (2002), S. 2266-2268 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structure of laser-induced refractory-metal-free C40 TiSi2 has been studied by glancing-angle x-ray diffraction (GAXRD) in detail. The result shows that laser-induced C40 TiSi2 has a hexagonal structure with the P6222 space group and lattice parameters a=0.467 nm and c=0.662 nm. The ordering effect and the stress effect on the TiSi2 film are also discussed based on the GAXRD and micro-Raman results. The C40 phase completely transforms to the technologically important C54 phase at a relatively low temperature of 700 °C. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1466521
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  • 2
    Electronic Resource
    Electronic Resource
    Reentrant behavior of poly(vinyl alcohol)–borax semidilute aqueous solutions (2000)
    Springer
    Colloid & polymer science 278 (2000), S. 187-194 
    Details
    ISSN: 1435-1536
    Keywords: Key words Poly(vinyl alcohol) ; Borax ; Dynamic light scattering ; Viscoelasticity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract  The reentrant behavior of Poly(vinyl alcohol) (PVA)–borax aqueous semidilute solutions with a PVA concentration of 20 g/l and borax concentrations varies from 0.0 to 0.20 M was investigated using dynamic light scattering (DLS) and dynamic viscoelastic measurements. Two (fast and slow modes) and three (fast, middle, and slow) relaxation modes of PVA semidilute aqueous solutions without and with the presence of borax, respectively, were observed from DLS measurements. The fast and middle relaxation modes were q 2-dependent (q is the scattering vector) characteristic of diffusive behavior; however, the slow modes were q 3-dependent, characteristic of intraparticle dynamics. The experimental results showed that the slow relaxation mode dominates the DLS relaxation. The DLS slow mode relaxation time, τs, and the viscoelastic modulus G′(ω) and G′′(ω) data had a similar trend and demonstrated reentrant behavior as the borax concentration was increased from 0.0 to 0.20 M, i.e. τs, G′(ω), and G′′(ω) fluctuated with increasing borax concentration. The excluded-volume effect of polymers, charge repulsion among borate ions bound on PVA molecules, and intermolecular cross-linking didiol–borate complexation caused an expansion of the polymer chain; however, the screening effect of free Na+ ions on the negative charge of the borate ions bound on PVA and intramolecular cross-linking didiol–borate complexation led to a shrinkage of the polymer chain. The reentrant behavior was the consequence of the balance between expansion and shrinkage of the PVA–borate complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003960050031
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  • 3
    Electronic Resource
    Electronic Resource
    Physical aging of epoxy resin blended with poly(ether sulfone): Effect of poly(ether sulfone) molecular weight (2000)
    Springer
    Journal of polymer research 7 (2000), S. 257-266 
    Details
    ISSN: 1572-8935
    Keywords: Poly(ether sulfone) ; Epoxy resin ; Physical aging ; DSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The physical aging process of 4-4′-diaminodiphenylsulfone (DDS) cured diglycidyl ether bisphenol-A (DGEBA) blended with various molecular weights of poly(ether sulfone) (PES; Mn = 28,600, 10,600, and 6,137) was studied by DSC. For DGEBA/DDS system blended with a low MW PES-3 (Mn = 6,137), no phase separation of the polymer blend and only one enthalpic relaxation process due to physical aging was observed. Since the high MW PES-1 (Mn = 28,600) had a Tg close to that of fully cured DGEBA/DDS, the fully cured DGEBA/DDS/PES-1 blend had a broader glass transition than a neat DGEBA/DDS system. However, the DSC results showed two enthalpic relaxation processes due to the physical aging of PES-rich and cured epoxy-rich phases as the material was aged at 155 °C (30 °C below Tg). Since the Tgs of PES-1-rich and epoxy-rich phases overlapped with each other, the enthalpic relaxation processes corresponding to each phase coupled to each other in the earlier stage of physical aging. The medium MW PES-2 (Mn = 10,600) has a much lower Tg than that of fully cured DGEBA/DDS, two well separated Tgs were observed for the cured DGEBA/DDS/PES-2 blend, indicating the cured epoxy was immiscible with PES. Aging the polymer blend at 155 °C (24 °C below Tg1 of the PES-2-rich phase and 53 °C below Tg2 of the epoxy-rich phase) produced two well separated relaxation processes due to PES-2-rich and epoxy-rich phases. The experimental results suggested that aging the polymer blend at a suitable temperature would improve the phase separation between PES-1-rich and epoxy-rich phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10965-006-0128-6
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  • 4
    Electronic Resource
    Electronic Resource
    Measurement of the np total cross section difference $\Delta\sigma_{\mathrm L}(np)$ at 1.39, 1.69, 1.89 and 1.99 GeV (2004)
    Springer
    The European physical journal 37 (2004), S. 79-90 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. New accurate results of the neutron-proton spin-dependent total cross section difference $\Delta\sigma_{\mathrm L}(np)$ at the neutron beam kinetic energies 1.39, 1.69, 1.89 and 1.99 GeV are presented. Measurements were carried out in 2001 at the Synchrophasotron of the Veksler and Baldin Laboratory of High Energies of the Joint Institute for Nuclear Research. A quasi-monochromatic neutron beam was produced by break-up of extracted polarized deuterons. The deuteron (and hence neutron) polarization direction was flipped every accelerator burst. The vertical neutron polarization direction was rotated onto the neutron beam direction and longitudinally (L) polarized neutrons were transmitted through a large proton L-polarized target. The target polarization vector was inverted after 1-2 days of measurements. The data were recorded for four different combinations of the beam and target parallel and antiparallel polarization directions at each energy. A fast decrease of $\Delta\sigma_{\mathrm L}(np)$ with increasing energy above 1.1 GeV was confirmed. The structure in the $\Delta\sigma_{\mathrm L}(np)$ energy dependence around 1.8 GeV, first observed from our previous data, seems to be well pronounced. The new results are also compared with model predictions and with phase shift analysis fits. The $\Delta\sigma_{\mathrm L}$ quantities for isosinglet state I = 0, deduced from the measured $\Delta\sigma_{\mathrm L}(np)$ values and the known $\Delta\sigma_{\mathrm L}(pp)$ data, are also given. The results were completed by the measurements of unpolarized total cross sections $\sigma_{0\mathrm{tot}}(np)$ at 1.3, 1.4 and 1.5 GeV and $\sigma_{0\mathrm{tot}}(n$ C) at 1.4 and 1.5 GeV. These data were obtained using the same apparatus and high intensity unpolarized deuteron beams were extracted either from the Synchrophasotron, or from the Nuclotron.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjc/s2004-01987-9
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  • 5
    Electronic Resource
    Electronic Resource
    Voltage shift of hysteresis loops of SrBi2Ta2O9 thin films under unipolar stress (2000)
    Springer
    Applied physics 71 (2000), S. 597-600 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 77.84.Dy; 77.84.Dj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Voltage shifts of hysteresis loops of metalorganic decomposition (MOD)-derived SrBi2Ta2O9 (SBT) thin films, known as imprint, have been observed after exposing the thin-film capacitors to unipolar pulses. The voltage shift changes with cumulative total time at maximum voltage, following a relationship with no pulse-width dependence. The origin of the voltage shift is briefly discussed in terms of an internal bias field induced by injected electrons trapped at positive polarity. The pulse-measurement responses are greatly affected by the internal bias field, even though no imprint failure was observed up to 1010 unipolar pulses. The voltage shift and asymmetric properties can be removed easily by applying bipolar pulses of saturation amplitude.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390000697
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of cationic stoichiometry of the bottom electrode La1-xSrxCoO3 on the microstructures of Pb(Ta0.05Zr0.48Ti0.47)O3 ferroelectric films using Pt/TiO2 conducting barrier (2000)
    Springer
    Applied physics 70 (2000), S. 69-73 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 77.55+f; 77.80.Dj; 77.80.Fm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. The heterostructures La1-xSrxCoO3/Pb(Ta0.05 Zr0.48Ti0.47)O3(PTZT)/La1-x SrxCoO3 have been deposited on SiO2/Si(001) substrates using Pt/TiO2 as conductive barrier by pulsed-laser deposition. La0.25Sr0.75CoO3(25/75) bottom electrodes with a pseudo-cubic perovskite structure favors (001)-textured growth of PTZT films. The ferroelectric capacitor LSCO(25/75)/PTZT/LSCO(25/75) remains about 96% of its polarization after 5×1010 switching cycles at an applied voltage of 5 V and a frequency of 500 kHz. The cross-section morphology of scanning electron microscopy and Rutherford backscattering spectra show that no obvious interdiffusion occurs across the interfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050013
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  • 7
    Electronic Resource
    Electronic Resource
    Crystal structure of 3-amino-5-acetyl-4,7-dihydro-6-methyl-4-(2-nitrophenyl)-2-cyanothieno[2,3-b]-pyridine and specific features of its molecular packing in crystal (2000)
    Springer
    Crystallography reports 45 (2000), S. 91-97 
    Details
    ISSN: 1063-7745
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The molecular and crystal structures of 3-amino-5-acetyl-4,7-dihydro-6-methyl-4-(2-nitrophenyl)-2-cyanothieno[2,3-b]-pyridine is determined by X-ray diffraction. The unit-cell parameters are as follows: a = 14.68(1) Å, b = 8.704(5) Å, c = 25.36(1) Å, V = 3241(6) Å3, d calcd = 1.453 g/cm3, Z = 8(1,1), and space group Pna21. Theo-nitrophenyl substituent is synperiplanar relative to the hydrogen atom at the C(4) atom of the heterocycle. Two crystallographically independent reference molecules A and B in the structure can be considered a pair of the enantiomers related by an approximate noncrystallographic center of inversion. The degree of approximation of this pseudocenter is discussed. It is shown that the structure can be described as a combination of two systems of translationally equal layers. The pseudosymmetry of the crystal structure and the possibility of forming a similar molecular packing with a higher crystallographic symmetry are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.171142
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  • 8
    Electronic Resource
    Electronic Resource
    Molecular and crystal structures of (S,S)-[o-(α-dimethylaminoethyl)phenyl]phenylarylcarbinols (2000)
    Springer
    Crystallography reports 45 (2000), S. 604-610 
    Details
    ISSN: 1063-7745
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structures of (S,S)-o-(α-dimethylaminoethyl)phenyl]phenyl-2,4-dimethylphenyl-carbinol (I) and (S,S)-o-(α-dimethylaminoethyl)phenyl]phenyl-2,4,5-trimethylphenylcarbinol (II) are determined by X-ray diffraction. The molecular and crystal structures of I and II are similar. The crystal structures of I and II are compared based on the analysis of the geometric characteristics of the Vorono $$\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l} $$ 2-Dirichlet packing polyhedra. The circular dichroism spectra of amino alcohols I and II revealed a strong positive Cotton effect in the region of 230 nm, which correlates with the S-configuration of the chiral carbinol center.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1306570
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  • 9
    Electronic Resource
    Electronic Resource
    Experimental study of the subthreshold production of K +-mesons in proton-nucleus collisions (2000)
    Springer
    JETP letters 72 (2000), S. 100-105 
    Details
    ISSN: 1090-6487
    Keywords: 13.75.Cs ; 21.30.−x
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Energy dependence of the differential cross sections for the production of K +-mesons with a momentum of 1.28 GeV/c (c is the speed of light) by protons incident on Be, Al, Cu, and Ta nuclei was measured for energies both above and below the K +-meson production threshold in pp collisions. Evidence is given for the dominance of the mechanism of direct production in the experiment. The characteristics of momentum distribution are determined for nucleons in the Be and Al nuclei up to 650 MeV/c. The data cannot be described in the model of nuclear spectral function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1316808
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesis and structure of 2-methyl-6-oxo-7,8-dihydrospiro(benzo[h]-triazolo[3,4-b]quinazoline-7,1′-cyclopentane) (2000)
    Springer
    Chemistry of heterocyclic compounds 36 (2000), S. 574-578 
    Details
    ISSN: 1573-8353
    Keywords: benzo[h] quinazolines ; triazole ; condensation ; methylation ; cyclization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The reaction of 4-amino-3-ethoxycarbonyl-1,2-dihydrospiro(naphthalene-2,1′-cyclopentane) with benzoyl isothiocyanate led to the corresponding 4-(N′-benzoylthioureido) derivative, the cyclization of which gave 4-oxo-2-thioxo-1,2,3,4,5,6-hexahydrospiro(benzo[h]qquinazoline-5,1′-cyclopentane). Condensation of the latter with hydrazine hydrate gave 2-hydrazino-3,4,5,6-tetrahydrospiro(benzo[h] quinazoline-5,1′-cyclopentane), which formed 6-oxo-1H-7,8-dihydrospiro(benzo[h] triazolo[3,4-b] quinazoline7,1′-cyclopentane) in reaction with orthoformice ester. Methylation of the product with methyl iodide led to its 2-methyl derivative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02290848
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