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  • 1
    Electronic Resource
    Electronic Resource
    Anomalous magnetoelastic waves in nickel wire (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 2584-2586 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An anomalous magnetoelastic wave is observed in a 0.127-mm-diam nickel wire using ordinary magnetostrictive transducers. The group velocity of this wave is constant over a frequency range from 1 to 3.5 MHz, and equal to the shear wave velocity of the material (3 km/s for nickel). However, the phase velocity of this wave is extremely high (up to 416 km/s was observed) and in the opposite direction to the group velocity. This anomaly disappears when an axial dc current is applied; a normal Wiedemann-type signal appears at the same group delay. This wave is different from previously known backward waves. This wave also appears in some other magnetostrictive materials.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353072
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrasonic imaging, particle detection, and V(z) measurements in molten zinc using focused clad buffer rods (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 3579-3586 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Ultrasonic imaging, particle detection, and V(z) measurements have been performed using focused clad buffer rods in molten zinc at temperature more than 600 °C. The focused ultrasonic waves are generated by a spherical or cylindrical acoustic lens which is fabricated at the end of the clad buffer rod. In order to evaluate its focusing ability, several experiments are carried out at 10 MHz in a pulse-echo mode. The lateral resolution at the focus of the spherical acoustic lens in molten zinc is quantitatively examined and compared with that in water using a thin stainless wire with a diameter of 380 μm. High resolution ultrasonic imaging is carried out by the common C-scan technique. The signal-to-noise ratio of the reflected signals from the flat sample surface at the focus is better than 35 dB. Ultrasonic images are obtained from the amplitude and time delay variations of the reflected signals. An attempt has also been made to detect particles suspended in molten zinc. Backscattered signals from particles are clearly visible at the focal region of the lens. For quantitative materials evaluation, V(z) curve measurements are performed using both spherical and cylindrical surface lenses and the leaky surface acoustic wave velocity of a ceramic (SiC) plate immersed in molten zinc is successfully determined. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1287041
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  • 3
    Electronic Resource
    Electronic Resource
    In-line phase modulators using coaxial thick lead zirconate titanate coated optical fibers (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3323-3329 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thick piezoelectric lead zirconate titanate (PZT) films (ceramic–ceramic 0–3 composite films), using a new sol-gel based process, have been produced and used to coaxially coat optical fibers. Coated PZT of up to 200 μm thick and 10 cm long have been achieved. Using thick PZT coated single mode optical fibers, in-line phase modulators are designed, built and tested. Theoretical and experimental investigations of such phase modulators are also presented. The measured phase modulation ranges from hundreds of kilohertz to several megahertz. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362661
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  • 4
    Electronic Resource
    Electronic Resource
    Analysis of thin rod flexural acoustic wave gravimetric sensors (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 2183-2185 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An analysis of thin rod flexural acoustic wave gravimetric sensors is presented. The diameter of the thin rod is much less than a wavelength. The lowest order flexural acoustics mode, F11, is of interest. For small added masses, the calculated mass sensitivity is −1/(2ρa), where ρ is the density and a is the radius of the thin rod. Measurements of velocity dispersion of the F11 mode in 21-μm-diam gold wires are shown to agree well with the theoretical calculation. Devices based on thin rods are shown to potentially have the same advantages as plate-mode gravimetric sensors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102962
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Characterization of cladded glass fibers using acoustic microscopy (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 55 (1989), S. 2485-2487 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spatial distribution profiles of leaky surface acoustic wave velocity (VLSAW ) and attenuation across the diameters of cladded glass fibers are presented. The profiles are obtained by using a novel V(x,z) analysis with a reflection scanning acoustic microscope operated at 775 MHz, and are compared with optical refractive index profiles. Optical fibers with different dopants and dopant concentrations have been investigated. The role of acoustic property profiles in the design of optical and acoustic fibers is outlined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102006
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  • 6
    Electronic Resource
    Electronic Resource
    Sensitivity analysis for Love mode acoustic gravimetric sensors (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 2940-2942 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An approximate mass sensitivity formula for Love mode sensors is presented. The optimal thickness of the guiding layer, at which the sensitivity, Sfm is maximum for a given frequency or wavelength is obtained. The (Sfm)max can be expressed as −k0/ρ1λ1, where ρ1 is the density, λ1 is the wavelength of the surface transverse wave of the substrate, and k0 is a coefficient determined by the ratio of shear wave velocity and the ratio of density of the substrate to those of the overlayer. The (Sfm)max of the Love mode device can be 20 times higher than that of the shear horizontal SH–surface acoustic wave device fabricated on the same substrate and operating at the same frequency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111976
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  • 7
    Electronic Resource
    Electronic Resource
    Acoustic graded-index lenses (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 1398-1400 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Experimental investigations of the focusing behavior of rods having acoustically graded-index profile across the rod diameter are presented for the first time. The ray acoustics approach is used for the theoretical interpretation. Acoustic velocity profiles have been measured using a 225 MHz line focus beam scanning acoustic microscope. The focusing behavior is visualized with a Schlieren system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105318
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  • 8
    Electronic Resource
    Electronic Resource
    Ultrasonic thin-walled tube wave devices for sensor applications (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 37-39 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Integrated gravimetric sensor configurations have been demonstrated by employing a sol–gel processed thin piezoelectric lead zirconate titanate (PZT) film coated coaxially on stainless-steel tubes and interdigital transducers (IDT) fabricated as the transmitter and receiver on the curved tube surfaces. We have observed tube waves along both the axial and circumferential directions between 1 and 8 MHz. Theoretical analysis indicates that high mass sensitivity can be achieved by keeping the tube wall thin. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115484
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  • 9
    Electronic Resource
    Electronic Resource
    MOLECULAR AND NUCLEAR MAGNETIC MOMENTS (1952)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 55 (1952), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1952.tb26599.x
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  • 10
    Electronic Resource
    Electronic Resource
    Science and the Open-Doors Educational Movement (1975)
    Cambridge : Cambridge University Press
    The @China quarterly 64 (1975), S. 741-747 
    Details
    ISSN: 0305-7410
    Source: Cambridge Journals Digital Archives
    Topics: Linguistics and Literary Studies , History , Political Science , Sociology , Economics
    Notes: I visited China for 46 days in the months of July and August 1974, almost exactly two years after my first visit in 1972. The interval between my two visits coincided very closely with the growth of the campaign to criticize Lin Piao and Confucius, which reached an intense level at the time of my most recent visit. In my own view, the campaign was the second wave of the Cultural Revolution in succession to the first wave formed by the Great Proletarian Cultural Revolution. In both, the educational movement or revolution has played and is playing a very prominent role and has in turn produced very visible effects on China's science and technology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0305741000007591
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