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  • 1
    Electronic Resource
    Electronic Resource
    The relationship between the microstructure and magnetic properties of sputtered Co/Pt multilayer films (abstract) : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6099-6099 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Co/Pd multilayer films (MLFs) are of interest because of their potential application as high-density magneto-optical recording media. Co/Pd MLFs with varying Co and Pd layer thicknesses were grown by sputter-deposition onto (100) Si wafers. X-ray diffraction and high resolution electron microscopy were used to study the microstructure of the films, and Lorentz microscopy was used to analyze their magnetic domain structure. The films show an fcc crystal structure with a compromised lattice parameter and a strong (111) crystallographic texture in the growth direction. The compromised interplanar spacing parallel to the surface increased with decreasing thickness ratio (tCo/tPd), and the columnar grain size decreased with increasing Pd layer thickness. Films with tCo=0.35 nm and tPd=2.8 nm (columnar grain diameter 20 nm) showed promising magnetic properties, namely a high perpendicular magnetic anisotropy (1.85×105 J m−3), with a perpendicular coercivity of 98.7 kA m−1, a perpendicular remanence ratio of 99%, and a perpendicular coercivity ratio of 88%. The magnetic domains were uniform and of a narrow stripe type, confirming the perpendicular easy axis of magnetization. The Curie temperature was found to be about 430 °C. Films of pure Co and Pd, grown for comparison, also showed columnar grain structure with grain-sizes of the same order as those seen in the MLFs. In addition the Pd films showed a (111) textured fcc structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358384
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  • 2
    Electronic Resource
    Electronic Resource
    Intramolecular energy flow and bond dissociation in iodoacetylene and iododiacetylene (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 4668-4681 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Intermolecular and intramolecular energy flow and subsequent bond dissociation in collinear collisions I–C≡C–H+Ar and I–C≡C–C≡C–H+Ar have been studied by classical trajectory techniques over the collision energy range of 0 to 10 eV. When the molecule is initially in the ground state, the overall energy transfer in I–C≡C–H+Ar is very small, but in I–C≡C–C≡C–H+Ar it is large. The collisionally perturbed C–H bond stores a large amount of energy from translation for a brief period during the early stage of collision and transfers most of it to the inner region of the molecule, specifically to the low frequency C–I vibration. Thus the high-frequency vibration of the perturbed C–H bond during the collision plays a crucial role in determining the extent of intramolecular energy transfer and, in turn, C–I dissociation. But in nondissociative collisions, there is another series of the C–H vibration at the latter stage of collision, transferring energy back to translation. This study also considers collision-induced intramolecular energy flow in the molecule with an initially excited C–H bond. The relaxation of the low-lying C–H excitation is very slow on a nanosecond time scale. However, when the excitation is high, the vibrational frequency of the C–H bond is significantly weakened, thus becoming comparable to that of the triple bond, in which case the isolating effect of the adjacent C≡C bond is no longer important and intramolecular energy flow becomes efficient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467456
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  • 3
    Electronic Resource
    Electronic Resource
    Significant improvement in the surface smoothness of post-annealed Y-Ba-Cu-O thin films upon silver addition (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 856-858 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the effect of silver addition on the surface quality of rf-sputtered Y-Ba-Cu-O thin films. The Y-Ba-Cu-O-Ag films appear to have very smooth surfaces even if the post-annealing step is employed. The surface roughness of our ex situ grown Y-Ba-Cu-O-Ag film, having a 10.3 wt. % of silver, is within ±1% of the film thickness, which is more than 10 times better than the value of a typical post-annealed high-temperature superconducting film without silver.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346768
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  • 4
    Electronic Resource
    Electronic Resource
    Domain wall observation and eddy current loss of (110)[001] oriented 17–22 μm thick Si-Fe tape-wound cores up to 5 kHz : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6256-6258 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Dynamic magnetic domain observation and eddy current loss of tape-wound cores are discussed up to 5 kHz. The cores are made of 17–22 μm thick (110)[001] oriented silicon steel strips. Dynamic domain patterns were observed by using SEM on the surfaces of the tape-wound cores. In order to distinguish the moving domain walls from the standing ones, the drive frequency of the core should not be integral multiples of the scan frequency of the SEM(50.0 Hz). The model which includes dynamic wall number, wall bowing, and velocity of each domain wall agreed comparatively well with the measured eddy current losses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349984
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  • 5
    Electronic Resource
    Electronic Resource
    Relaxation of vibrationally excited HCl molecules in the H2O–HCl collision complex (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 9521-9531 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The temperature dependence of the relaxation of HCl(v=1) by H2O in a complex-mode collision is studied in a semiclassical approach. The de-excitation probability takes a maximum value near room temperature, and it decreases logarithmically with increasing temperature. The dependence is nearly linear. Below room temperature, the relaxation becomes less efficient. This unusual temperature dependence is a result of the vibrational relaxation occurring in complex-mode collisions, which are dominated by large impact parameter interactions. The principal pathway for the removal of vibrational energy is the H–Cl oscillatory and librational motions along the O–H–Cl configuration. When these hindered motions gain the energy, they undergo transitions to free rotational states. The decreased energy transfer efficiency at low temperature is due to the slowing of rotational motions. Energy transfer to the O–Cl large-amplitude motion is of minor importance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465486
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of the critical current criteria on the Ic vs T relation near Tc in polycrystalline Y-Ba-Cu-O thin films (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 403-405 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the temperature dependence of the critical current (Ic) near Tc for two Y-Ba-Cu-O thin films having zero-dissipation temperature (Tc) of 81 K and a Y-Ba-Cu-O thin film having Tc of 71 K. At temperatures higher than 0.9Tc, the critical current in a voltage criterion of 1 μV/cm appears proportional to (1−T/Tc)n with n≈2, and n≈1.5 in a 10 μV/cm criterion, exhibiting the dependence of n on the critical current criteria. This observation is in contrast with the report of n=1.5 by Ogale et al. [Phys. Rev. B 36, 7210 (1987)], Yuan et al. [J. Appl. Phys. 64, 4091 (1988)], and Horng et al. [Phys. Rev. B 39, 9628 (1989)], implying that n=2, the value for the superconductor-normal metal-superconductor tunneling junction of BCS superconductors near Tc must be taken into consideration to understand the intergrain tunneling process in polycrystalline high Tc thin films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103294
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  • 7
    Electronic Resource
    Electronic Resource
    The C-reactive protein (CRP) in patients with long bone fractures and after arthroplasty (1993)
    Springer
    International orthopaedics 17 (1993), S. 198-201 
    Details
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Du mois de Mars 1991 au mois de Février 1992 le taux sérique de la C-réactive protéine (CRP) a été mesuré de façon prospective pendant trois semaines chez 57 patients consécutifs atteints de fractures des os longs ainsi que chez 11 patients opérés pour la première fois d'arthroplastie de la hanche ou du genou. On a utilisé pour mesurer la CRP une analyse semi-quantitative (méthode de floculation capillaire). Les chiffres les plus élevés sont en général enregistrés 2 ou 3 jours après le traumatisme ou l'opération et la CRP est quasiment normalisée en trois semaines. Chez les patients fracturés l'amplitude de la CRP varie selon le type de traitement: les valeurs les plus basses s'observent chez les patients traités orthopédiquement plutôt que chez ceux qui sont opérés, mais la courbe de la CRP est la même quel que soit le traitement. La CRP est aussi influencée par la sévérité du traumatisme (ouvert ou fermé) chez les sujets traités orthopédiquement, mais non chez ceux qui sont opérés. Chez les malades traités par arthroplastie le type de réponse de la CRP est semblable à celui des patients opérés pour fracture. La connaissance de l'évolution naturelle des taux de CRP après fracture et après arthroplastie peut aider au diagnostic des complications post-traumatiques et post-opératoires, et tout particulièrement des infections.
    Notes: Summary Between March 1991 and February 1992 serial serum C-reactive protein (CRP) levels were measured prospectively for three weeks in 57 consecutive patients with fractures of long bones, and also in 11 patients who had undergone primary total hip or knee arthroplasty. A semi-quantitative capillary floculation method was used for measuring the CRP level. The highest values were usually recorded 2–3 days after trauma or operation, and the CRP was nearly normal by three weeks. In the patients with long bone fractures the amplitude of CRP response was affected by the type of treatment. Lower values were observed in those patients treated conservatively than in those who underwent operation, but the profile of CRP response was similar, regardless of the type of treatment. The CRP response was also affected by the severity of the trauma in conservatively treated patients, but in those who underwent operation the CRP response was similar, regardless of the severity of the injury. In patients with primary total hip or knee arthroplasty the pattern of CRP response after operation was similar to that in the patients with long bone fractures who underwent surgical treatment. Awareness of the natural course of the CRP response after fracture and arthroplasty may help in the diagnosis of early post-traumatic and postoperative complications, especially infections.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00186386
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  • 8
    Electronic Resource
    Electronic Resource
    Quantitative spectral analysis for flaw detection in concrete (1991)
    Springer
    Research in nondestructive evaluation 3 (1991), S. 171-182 
    Details
    ISSN: 1432-2110
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The resonance method of transient stress wave propagation is employed for the detection of flaws in concrete. Quantitative analysis of the spectra identifies the resonance mode due to reflection from the flaw, and enables the exclusion of the flexural modes of the concrete plate above the flaw. Two-dimensional scanning of a test point provides the information about the depth of internal flaws. The test results of a large concrete block containing several types of artificial flaws are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01613128
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  • 9
    Electronic Resource
    Electronic Resource
    Phase transformation studies on a synthetic hedenbergite up to 26 GPa at 1200° C (1991)
    Springer
    Physics and chemistry of minerals 17 (1991), S. 540-544 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Phase transformations in a synthetic hedenbergite (CaFeSi2O6) have been observed with X-ray diffraction up to 26 GPa at ∼ 1200° C in a diamond anvil cell with a YAG laser heating system. Hedenbergite first decomposes into spinel, stishovite, and cubic perovskite phases at ∼ 16 GPa, and spinel further decomposes into wüstite and stishovite at ∼ 19 GPa. Between 19 GPa and 26 GPa, the phase assemblage is wüstite + stishovite+ perovskite. On decompression to 0.1 MPa, all the highpressure phases are retained except the cubic perovskite, which reverts to a retrogressive phase of CaSiO3. A comparison of the results of this study with those from a previous study on a natural hedenbergite suggests that the garnet phase formed from natural hedenbergite is stabilized by manganese.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202232
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  • 10
    Electronic Resource
    Electronic Resource
    Factors affecting sliding of the lag screw in intertrochanteric fractures (1993)
    Springer
    International orthopaedics 17 (1993), S. 320-324 
    Details
    ISSN: 1432-5195
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Une complication majeure du traitement opératoire des fractures intertrochantériennes et particulièrement des fractures instables est l'échec de fixation. Une étude de 76 fractures intertrochantériennes consécutives, traitées du 1er mars 1989 au 28 février 1991, a été réalisée. Toutes les fractures ont été réduites anatomiquement et fixées par une vis à compression de 135°. Il y a eu deux cas de pénétration intra-articulaire de la vis (3,2%) et huit cas de glissement excessif (12,9%). Cette complication n'a été observée que dans les fractures instables et la fréquence du glissement excessif était significativement plus élevée chez les malades âgés et dans les cas où le fragment distal était déplacé en dedans et en avant du fragment proximal. L'instabilité de la fracture, l'âge du malade et le type de déplacement peuvent être considérés comme les causes principales du glissement excessif.
    Notes: Summary A retrospective study of 76 intertrochanteric fractures was undertaken to evaluate the failures of fixation. In every case anatomical reduction was attempted, and 135° sliding compression screws and plates were used for fixation. In 2 cases, the screw penetrated into the joint and there were 8 cases where there was excessive sliding of the implant. These complications were only found in unstable fractures. They occurred most frequently in elderly patients, and when the distal fragment was displaced medially and anteriorly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00181709
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