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  • 1
    Electronic Resource
    Electronic Resource
    Ultrafast optical sampling pump-probe measurement of exciton spin relaxation in GaAs/AlGaAs quantum wells (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 964-966 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spin dynamics in GaAs/AlGaAs multiple quantum wells at room temperature are studied in subpicosecond to nanosecond time region by using the optical sampling nondegenerate pump-probe technique. Polarization-dependent absorption signals resonant to the light-hole (lh) exciton revealed the subpicosecond spin relaxation time which was several tens of times shorter than that of the heavy-hole (hh) exciton. Resonant pumping to lh and probing at hh exhibited no spin dependence within the time resolution, showing the spin memory being washed out completely during the energy relaxation from lh to hh. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.116113
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Real-space polariton wave packet imaging (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 1317-1320 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The propagation of collective lattice vibrational wave packets that move at lightlike speeds through their crystalline hosts has been monitored through a real-space imaging method based on Fresnel diffraction and phase-contrast microscopy. Coherent optic phonon–polaritons generated through impulsive stimulated Raman scattering in a ferroelectric crystal are imaged with 5 μm spatial resolution and 35 fs time resolution as they propagate out of the excitation region and into other parts of the crystal. The "spatiotemporal" imaging method will permit direct examination of nonlinear lattice dynamics and will provide feedback in coherent control systems that use spatiotemporal femtosecond pulse shaping to manipulate propagating excitations with ultrashort light pulses directed to specified sample locations at specified times. The method will also permit the examination of defects and fabricated structures in bulk or thin film crystals using visible light. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478007
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  • 3
    Electronic Resource
    Electronic Resource
    Recycling of Stainless Steel Grinding Sludge (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 534-536 (Jan. 2007), p. 997-1000 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Stainless steel sludge is generated as a waste in the grinding process, and the possibilityof recycling stainless steel is considered here. Generally, stainless steel grinding sludge rangingabout 10,000 are generated per a year in Japan, and most of it is discarded or re-melted with scrapsteel. In this study, we considered the possibility of using the stainless steel sludge as metal powderfor MIM or raw material for metal foam. For the MIM process, the metal powder will need someimprovement, and flotation and spheroidizing processes of the sludge are necessary. For fabricationof the metal foam, untreated sludge can be used, and steel foam about 90% porosity is produced
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.534-536.997.pdf
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