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  • 1
    Electronic Resource
    Electronic Resource
    Encapsulated nanoparticles of iron metal (1994)
    s.l. : American Chemical Society
    Chemistry of materials 6 (1994), S. 784-787 
    Details
    ISSN: 1520-5002
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/cm00042a014
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  • 2
    Electronic Resource
    Electronic Resource
    Vibrational Spectra, Orientations, and Phase Transitions in Long-Chain Amphiphiles at the Air/Water Interface: Probing the Head and Tail Groups by Sum Frequency Generation (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 13729-13734 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100102a045
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  • 3
    Electronic Resource
    Electronic Resource
    Photoluminescence studies of strained InxGa1−xAs-Al0.28Ga0.72As heterostructures grown by molecular-beam epitaxy (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 246-250 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Low-temperature photoluminescence measurements were carried out on pseudomorphically strained InxGa1−xAs-Al0.28Ga0.72As ternary-on-ternary heterostructures grown by molecular-beam epitaxy to investigate the change in the transition energy and linewidth as a function of InGaAs well thickness at two different indium compositions x=0.10 and x=0.15, respectively. Sharp exciton peaks as narrow as 4–6 meV were observed from the InGaAs wells grown at 530 °C with 1 min of growth interruption at the top and bottom heterointerfaces. The linewidth decreases as the well thickness is increased up to 300 A(ring). In addition, there are signs of linewidth broadening at higher well thicknesses which may indicate the onset of plastic relaxation. Relatively small variations in the transition energy were observed at well thicknesses which are above the theoretical critical thickness as calculated by the Matthews–Blakeslee model [J. Cryst. Growth 27, 118 (1974)], suggesting the existence of a second critical thickness higher than the theoretical value. Good agreement between experimental and calculated transition energy versus well thickness data was obtained, from which the conduction-band offset ΔEc/ΔEg was estimated to be 0.65±0.05 for x=0.10–0.15, consistent with the results derived from other techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357135
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  • 4
    Electronic Resource
    Electronic Resource
    Model for calculating Tc of pluralistic magnetic component compounds (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7456-7460 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A coupling model of the pluralistic magnetic component R-T intermetallic compounds (R denotes rare earth, T denotes transition metal) has been proposed by means of the mean-molecular-field analysis. Using the model, the Curie temperature Tc of (Sm1−xPrx)2Fe17 compounds has been calculated and the calculated values have been compared with the experimental values. It is found that the former are consistent with the later. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357973
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  • 5
    Electronic Resource
    Electronic Resource
    The magnetic properties of R2(Fe1−xSix)17 compounds (R=Dy, Y) (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7452-7455 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The structures and magnetic properties of R2(Fe1−xSix)17 compounds (R=Dy, Y) were investigated by x-ray phase analysis and magnetic measurements. It is shown that Si substitution for Fe leads to a phase transition at x=0.2, and that the mean iron magnetic moment μFe of R2(Fe1−xSix)17 compounds (R=Dy, Y) decreases as Si concentration x increases; moreover, there is a maximum of dependence Tc(x) at about x=0.16. It is found that the exchange interaction constant AFeFe in R2(Fe1−xSix)17 compounds (R=Dy, Y) increases with x increasing by means of mean-molecular-field analysis of Tc. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357972
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  • 6
    Electronic Resource
    Electronic Resource
    Sudden structural change at an air/binary liquid interface: Sum frequency study of the air/acetonitrile–water interface (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 5099-5101 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the first observation of a sharp structural change in an air/acetonitrile–water interface as the solution composition varies; the abruptness of which suggests an interfacial phase transition. The structural change is manifested by shifts in the frequency and in the polarization of the signal from the acetonitrile molecules in the interface observed using infrared+visible surface sum frequency generation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.464933
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  • 7
    Electronic Resource
    Electronic Resource
    The added mass, Basset, and viscous drag coefficients in nondilute bubbly liquids undergoing small-amplitude oscillatory motion (1991)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 3 (1991), S. 2955-2970 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The motion of bubbles dispersed in a liquid when a small-amplitude oscillatory motion is imposed on the mixture is examined in the limit of small frequency and viscosity. Under these conditions, for bubbles with a stress-free surface, the motion can be described in terms of added mass and viscous force coefficients. For bubbles contaminated with surface-active impurities, the introduction of a further coefficient to parametrize the Basset force is necessary. These coefficients are calculated numerically for random configurations of bubbles by solving the appropriate multibubble interaction problem exactly using a method of multipole expansion. Results obtained by averaging over several configurations are presented. Comparison of the results with those for periodic arrays of bubbles shows that these coefficients are, in general, relatively insensitive to the detailed spatial arrangement of the bubbles. On the basis of this observation, it is possible to estimate them via simple formulas derived analytically for dilute periodic arrays. The effect of surface tension and density of bubbles (or rigid particles in the case where the no-slip boundary condition is applicable) is also examined and found to be rather small.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.857838
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  • 8
    Electronic Resource
    Electronic Resource
    Ensemble phase-averaged equations for bubbly flows (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 6 (1994), S. 2956-2970 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A system of averaged equations describing the motion of a mixture of spherical compressible bubbles in an inviscid liquid is derived by the ensemble-averaging method introduced in an earlier paper [Zhang and Prosperetti, J. Fluid Mech. 267, 185 (1994)]. The averaging procedure introduces new terms in the equations, among which a contribution to the liquid stress tensor is of special interest. An extension of the well-known Rayleigh–Plesset equation to the case of bubbles interacting with the flow is also found. The general system of equations is closed in a rigorous manner in the dilute limit generalizing and correcting earlier averaged equations models. The results are illustrated by considering the problem of linear pressure wave propagation in a nonuniform bubbly liquid. Gradients of the bubble concentration are shown to dampen or amplify the wave strength.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.868122
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  • 9
    Electronic Resource
    Electronic Resource
    Acoustic wave velocities in ceramics and other materials measured by a broadband goniometric method (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 1271-1273 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This article describes an economical short-pulse ultrasound system with a goniometer stage, with which both compression and shear wave reverberations in thin ceramic or other material samples may be separately time resolved. Arrival times of individual reverberations are compared to estimates made by computer simulation of the wave system by means of a parameter fitting routine. The system output gives compression and shear velocities based on several reverberations in the test material. Wide frequency bandwidths are achieved by using acoustically thick PZT transducers in time intervals less than one half period of their fundamental compression wave frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144078
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  • 10
    Electronic Resource
    Electronic Resource
    Three-terminal bias induced dual wavelength semiconductor light emitter (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 570-572 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A three-terminal version of a light emitting device, a bias induced color-tunable emitter (BICE), is reported. The three-terminal BICE is a multiwavelength semiconductor light emitter in which the emission wavelength is determined by an applied voltage, while the emission intensity is modulated by an applied current (no optical pumping employed). Device operation is based on the bias dependent injection and collection of electrons and holes in quantum wells. In this letter, three-terminal dual wavelength BICE functionality is demonstrated. The device exhibits coaxial optical output, a large separation of emitted wavelengths (≈570 A(ring)), low operational voltages and currents, and high emission contrast ratios of 159:1 and 1:76 at 77 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112298
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