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  • 1
    Electronic Resource
    Electronic Resource
    Calibration of Sm:YAG as an alternate high-pressure scale (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 5357-5359 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The pressure-induced wavelength shift of a laser-excited fluorescence in samarium-doped yttrium aluminum garnet (Sm:YAG) was compared with that of ruby to 26 GPa at room temperature. Because the fluorescence wavelength for Sm:YAG has a negligible temperature dependence, it provides a better pressure scale for diamond anvil cell applications than ruby under high-temperature conditions. However, the overall intensity of the Sm:YAG fluorescence is less than that for ruby. A Gaussian–Lorentzian profile was chosen to analyze the fluorescence spectra. The Sm:YAG fluorescence wavelength exhibits an approximately linear pressure dependence (3.07±0.45 A(ring)/GPa) only to 20 GPa at room temperature. A polynomial fit for all data to 26 GPa gives P(GPa)=−10 280(λ/λ0−1)2 +2085(λ/λ0−1), with a rms misfit of 0.14 GPa.〈squeeze〉
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347031
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  • 2
    Electronic Resource
    Electronic Resource
    The formation of jets from shaped charges in the presence of asymmetry (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 2136-2143 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The jet from a nominally axisymmetric shaped charge is formed by the collapse of the typically conical liner under the high pressures resulting from detonation of the explosive around it. Where asymmetries are present the velocities imparted to the elements of the liner at a given axial distance from the cone tip will vary as a function of the azimuthal angle among other variables. In general these elements will not meet at all. Conversely a pair of liner elements that do meet will in general have started from different axial positions, and will meet away from the nominal axis of symmetry of the charge. This effect renders the formation process asymmetrical. Consequently the jet particles have an off-axis velocity component which can substantially degrade the penetrative capability of the charge. A complete analysis of asymmetrical liner collapse and jet formation is presented for the case where the liner is axisymmetric, but there is an azimuthal variation in liner projection velocity. The classical analysis of symmetric liner collapse and jet formation is extended to include this type of asymmetry. Earlier work on linear shaped charges, particularly a model for asymmetric jet formation, is drawn upon to consider plane sections of the liner individually. A fully three-dimensional analysis is then achieved by the combination of the results for these sections. This analysis is implemented in a computational model and example results are presented and compared in as far as is possible and meaningful with previous theoretical and experimental results. Good agreement with the previous theoretical work is obtained, and the values of the off-axis velocity components predicted are of the orders observed in the limited experimental data as yet available.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352329
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  • 3
    Electronic Resource
    Electronic Resource
    Vibrational analysis of the 460 nm band system of nickel dichloride produced in a free jet expansion (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 6365-6375 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Using a free-jet expansion which incorporates a heated nozzle, we have recorded the laser excitation spectrum of the 460 nm band system of NiCl2 at a rotational temperature of ∼40 K. 35Cl/37Cl isotope shifts were resolved which permit the assignment of progressions involving the symmetric stretching vibrational mode and identify a triplet splitting with spacings of 96 and 149 cm−1 which is believed to be due to spin–orbit coupling. Sequence bands involving the bending vibrational mode are also tentatively assigned. Only a small change in the symmetric stretching vibrational wave number is found between the electronic states involved in this transition (ν˜'1 =356 cm−1, ν˜″1 =360 cm−1). This result and the triplet splitting observed are discussed with respect to the possible electronic states involved and the assignment of this band system as either a Laporte forbidden g↔g transition involving the d orbitals on the Ni atom or an allowed u↔g charge transfer transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458315
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  • 4
    Electronic Resource
    Electronic Resource
    Long-range poisoning of D2 dissociative chemisorption on Pt(111) by coadsorbed K (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 3767-3774 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report detailed molecular beam studies of the effects of K adsorption on the dissociative chemisorption probabilities S0 for D2 on Pt(111). In contrast to conventional wisdom for many other molecular systems, we find that K is a very strong poison rather than promoter for H2 dissociation. S0 decreases roughly exponentially with K coverage aitch-thetaK. The effective cross section for poisoning per adsorbed K varies between 70 and 430 A(ring)2, depending upon incident energy Ei. This suggests that an extremely long-range electronic perturbation is responsible for the poisoning. A theoretical model is developed to describe these sticking measurements. It is based on the fact that the adsorbed K lowers the work function of the surface. This enhances Pauli repulsion for the molecule-surface interaction which, in turn, increases the barrier to dissociation. When the model is generalized to include inhomogeneous effects through a local work function, excellent agreement is obtained between the model and experiments. This model also naturally accounts for the increased associative desorption temperatures for H2 when coadsorbed K is present.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460827
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  • 5
    Electronic Resource
    Electronic Resource
    Molecular beam studies of H2 and D2 dissociative chemisorption on Pt(111) (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 5240-5246 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Molecular beam techniques have been utilized to measure the dissociative chemisorption probability at zero surface coverage S0 for D2(H2) on Pt(111) as a function of initial energy Ei, angle of incidence θi, surface temperature Ts, isotopic mass and nozzle temperature Tn. S0 shows a large increase with translational energy, but no threshold in Ei, a peaking at θi=0°, and an independence with Ts, isotope and Tn. These results are interpreted in terms of direct dissociative chemisorption on the Pt(111) terraces. The dynamical picture that emerges is that although there is no significant barrier to dissociation along the minimum energy path, barriers do exist along nonoptimal reactive trajectories. Thus, the "translational activation'' and other dynamical observations are intimately related to the multidimensional aspects of the dissociative potential energy surface. Some aspects of the dissociative chemisorption, however, still seem somewhat surprising within this general description.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459669
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  • 6
    Electronic Resource
    Electronic Resource
    Non-consummation of marriage treated by members of the Institute of Psychosexual Medicine: a prospective study (1983)
    Oxford, UK : Blackwell Publishing Ltd
    BJOG 90 (1983), S. 0 
    Details
    ISSN: 1471-0528
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary. A prospective study of the treatment of unconsummated marriage was carried out by 16 doctors trained by the Institute of Psycho-sexual Medicine. This training stresses the development of skills in using the doctor/patient interaction therapeutically, rather than in the acquisition of knowledge. The 159 couples admitted to the study had a mean duration of symptoms of 4.2 years; 60% of them had consummated by 6 months and 72% by 24 months. Other improvements in sexual function occurred even among those failing to consummate; 135 couples had previously consulted 253 other agents. The average cumulative length of treatment at the 6-month review was 3 h. Partners attending alone did as well as couples who attended together.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1471-0528.1983.tb06762.x
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  • 7
    Electronic Resource
    Electronic Resource
    Asymmetry of gait in normal children demonstrated by polarized light goniometry (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Child 9 (1983), S. 0 
    Details
    ISSN: 1365-2214
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Psychology
    Notes: Summary Polarized light goniometry recordings were obtained from 46 neurologically normal children aged 4–15 years. Asymmetry in terms of thigh and knee angle differences between right and left legs was common in children aged less than 10 years but uncommon in children aged more than 10 years. This asymmetry was predominantly in the direction of more flexion on the right side. The tendency for goniometric asymmetry to mirror asymmetry on clinical examination was slight and did not reach statistical significance. It is suggested that angular asymmetry during gait which occurs in some children under 10 years of age may be related to unequal rates of maturation of the two hemispheres. Other minor neurological asymmetries, neuro-anatomical asymmetries and postural asymmetries which may be found in normal children are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2214.1983.tb00307.x
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  • 8
    Electronic Resource
    Electronic Resource
    Portage guide to early intervention: cross-cultural aspects and intra-cultural variability (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Child 18 (1992), S. 0 
    Details
    ISSN: 1365-2214
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Psychology
    Notes: Summary The issues arising from implementing an early intervention service, developed in the rural United States in the late 1960s in a range of different cultural contexts over a period of a quarter of a century, are explained. Services from India, Bangladesh, Jamaica and the United Kingdom are compared.As well as considering cross-cultural aspects of Portage, variability within one country, the United Kingdom, is considered by comparing one service in an inner-city area and one in a rural area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2214.1992.tb00367.x
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  • 9
    Electronic Resource
    Electronic Resource
    Comment on "Mechanism for efficient blue second-harmonic generation in periodically segmented waveguides'' (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 2567-2567 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104828
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  • 10
    Electronic Resource
    Electronic Resource
    Improvement of ohmic contacts on GaAs with in situ cleaning (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1030-1032 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An in situ argon ion mill clean step prior to ohmic metal deposition has been demonstrated to improve the uniformity of the contact parameters and reduce the contact resistance. After ion mill cleaning, the native oxide regrowth of molecular beam epitaxy grown GaAs and AlGaAs layers in vacuum chamber was also studied to optimize the processing. These oxide layers were identified as the cause of problems in the formation of good ohmic contacts to the GaAs or AlGaAs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.104414
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