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  • American Institute of Physics (AIP)  (7)
  • Blackwell Publishing Ltd  (2)
  • 1985-1989  (9)
  • 1
    Electronic Resource
    Electronic Resource
    Magnetic field effects on triplet exciton fission and fusion in a polydiacetylene (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 6642-6646 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have studied the origin and decay dynamics of triplet excitons in the conjugated polymer poly(4BCMU) in its sol(yellow) and gel(red) phases. Wavelength and intensity dependencies of the triplet yield show that the triplet exciton cannot be produced by excitation into the singlet exciton edge but only from higher lying states. The observed lifetime of the triplet state, coupled with the magnetic field dependence of the triplet state production and decay, indicate that the triplet state is created by a fission process from the excited singlet. The time and magnetic field dependence of the triplet exciton decay indicate that the triplet exciton decay in the red phase occurs by diffusive bimolecular fusion, but in the yellow phase the triplet exciton decay is nondiffusive. We postulate that the unimolecular decay of the triplet exciton in the yellow phase results from exciton pinning by conformational disorder.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456281
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  • 2
    Electronic Resource
    Electronic Resource
    Device applications of vanadium-doped silicon-dioxide (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 4082-4084 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This study has been undertaken in an attempt to investigate the possible applications of transition-metal-doped amorphous silicon-dioxide in floating-gate avalanche-metal/silicon-dioxide/silicon-type nonvolatile memories, with the objective of developing an electrically erasable programmable read-only memory structure with low WRITE and ERASE voltages, (e.g., (approximately-equal-to)5 V) which does not depend for its operation on the very thin tunneling oxides (i.e., ≤80 A(ring)) currently used and which are a major source of device instability and degradation. Results are presented for 200-A(ring)-thick vanadium-doped silicon-dioxide films which show reproducible current-voltage characteristics at much reduced voltages compared with conventional thin thermal oxides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343340
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of a substrate on the phase transformations of amorphous TiSi2 thin films (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 540-544 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The crystallization of an amorphous TiSi2 evaporated film has been studied on both poly-Si and SiO2 substrates. A metastable form of TiSi2 (base-centered orthorhombic; a=3.62 A, b=13.76 A, and c=3.605 A) [P. G. Cotter, J. H. Kohn, and R. A. Potter, J. Am. Ceram. Soc. 39, 11 (1956)] is formed first at a temperature of approximately 350 °C on both substrates. This phase consumes the entire amorphous layer before undergoing a polymorphic transformation to face-centered orthorhombic TiSi2 (a=8.24 A, b=4.78 A, and c=8.54 A) [F. Laves and H. J. Wallbaum, Z. Kristallogr. 101, 78 (1979)] at 600 and 800 °C on poly-Si and SiO2, respectively. These transformations were investigated using in situ resistivity, x-ray diffraction, and transmission electron microscopy. The room-temperature resistivities observed were 96 and 20 μΩ cm for the base-centered and face-centered TiSi2, respectively. The enhanced polymorphic transformation on poly-Si over SiO2 is explained by a lowering of surface energy barrier to nucleation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338254
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal stability of the Al/PdxW100−x/Si contact systems (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 1886-1892 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Interactions of thin films of Al and Pd-W alloys (Pd80W20 and Pd20W80) deposited on Si and on SiO2 have been studied using Auger-electron spectroscopy, Rutherford backscattering spectrometry, x-ray diffraction, and forward current-voltage measurements of Schottky-barrier height. For the bilayer films deposited on the inert substrate of SiO2, Pd reacts with Al, forming Al-rich Al-Pd intermetallic compounds at 400 °C. Furthermore, in the Pd-rich alloys (Pd80W20) Al permeates through the whole alloy film readily at 500 °C, while in the W-rich Pd20W80 the integrity of the alloy film is preserved even following annealing at 600 °C. For the bilayer films deposited on single-crystal Si, the results of annealing show extraction of Pd to both sides of the alloy, forming Pd2Si at the Si side and Al-Pd intermetallic compounds at the Al side. In the case of the Pd-rich alloy (Al/Pd80W20/Si) contact deterioration due to Al penetration to the substrate interface is observed at 500 °C and possibly at 400 °C. In the case of the W-rich alloy (Al/Pd20W80/Si) the stability of the contact is preserved even following annealing at 550 °C for 30 min; the structure after the annealing is Al-Pd/Pd-W/Pd2Si/Si. The W-rich alloy is very promising for contact applications in Si devices due to the fact that both a shallow silicide contact and a built-in diffusion barrier are simultaneously obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335992
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  • 5
    Electronic Resource
    Electronic Resource
    Grain size measurement using magnetic and acoustic Barkhausen noise (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3199-3201 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results on annealed nickel show that the total number of counts of both magnetic and acoustic Barkhausen signals vary inversely with grain size. In decarburized steels the total number of counts and the amplitude of both Barkhausen signals increase in proportion to grain size. The paper addresses these results in context of grain size, grain-boundary segregation, and precipitate effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338900
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  • 6
    Electronic Resource
    Electronic Resource
    A study on the effect of dislocation on the magnetic properties of nickel using magnetic NDE methods (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 61 (1987), S. 3196-3198 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Dislocations affect the magnetic properties of ferromagnetic materials by pinning the domain walls. The primary mechanism is interaction between the stress fields of dislocation and domain walls. Using magnetic nondestructive methods, namely the acoustic Barkhausen noise (AB), magnetic Barkhausen noise (MB), and the hysteresis curves, we have studied these interactions. The three measurements give different types of information. AB provides information about non-180° type domain wall interaction, MB primarily provides information about 180° domain wall interaction, and the hysteresis curve about both these interactions as well as about rotation of domain walls. The paper presents results obtained on polycrystalline nickel which was first deformed and then annealed at different temperatures in order to achieve different dislocation densities. The results show that AB and hysteresis loss follow the same trend as hardness. MB results, however, change in a more complex fashion which is sensitive to grain recrystallization as well as dislocation structure. Interesting features of these results will be discussed in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.338899
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  • 7
    Electronic Resource
    Electronic Resource
    Phase transformations of alloys on a reactive substrate: Interaction of binary alloys of transition and rare-earth metals with silicon (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 705-710 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Transition and rare-earth metals have been found to interact with single-crystal Si in a way that allows a division into three distinct classes: near noble, refractory, and rare earth. Recently, attention has turned to the reaction of their binary alloys with Si. In this paper we will try to demonstrate that by regarding the alloy-Si reaction as a phase transformation of alloys under the influence of a reactive substrate, we can undertake a systematic approach for the study of this kind of phase transformations involving ternary elements. In essence we show that the kinetic path taken by the alloy-Si interaction can be understood and anticipated from the reaction characteristics of the proper metal/Si bilayers and the reaction in the alloy itself. Results will be shown for Er-Pt, and Gd-Ti alloys on Si which confirm this systematic approach, which is also supported by previously published data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.336186
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  • 8
    Electronic Resource
    Electronic Resource
    PRIVATISATION VIA MANAGEMENT AND EMPLOYEE BUYOUTS (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of public and cooperative economics 60 (1989), S. 0 
    Details
    ISSN: 1467-8292
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1467-8292.1989.tb01337.x
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  • 9
    Electronic Resource
    Electronic Resource
    Pectinesterase Activity, Pectin Methylation, and Texture Changes During Storage of Blanched Cucumber Slices (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 50 (1985), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Pectin methylation in blanched cucumber slices after 6 months’storage in acid brine (pH 3.7) ranged from 9% (no blanch) to 48% (99°C, 3 min blanch). An 81°C blanch caused complete pectinesterase inactivation, but 15 - 20% reactivation occurred during storage. After a 99°C blanch, only slight reactivation was observed. Pectinesterase was not inactivated at 66°C or less, but up to 85% of the activity was lost during storage. Firmness changes were complex. A clear relationship between pectin methylation and firmness changes was not observed. A 66 or 81°C blanch resulted in best firmness retention. Calcium ion was very effective in prevention of firmness loss regardless of the extent of pectin methylation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1985.tb13309.x
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